A device for controlling the thickness of asphalt concrete paving

Abstract

This invention discloses an asphalt concrete paving thickness control device, relating to the field of road construction technology. It includes a frame and a screed mounted on the main body of the paving equipment. A first helical shaft is rotatably connected to the frame, and a movable frame is slidably mounted on the frame. A second helical shaft is rotatably connected to the movable frame. The first helical shaft has a helical groove adapted to the second helical shaft. In this asphalt concrete paving thickness control device, when the first and second helical shafts rotate relative to each other, the overall helical shaft formed by them can lengthen or shorten. During this process, the movable frame slides accordingly, thereby adjusting the length of the overall helical shaft. Furthermore, during adjustment, the overlapping portion of the first and second helical shafts is contained within the helical groove, without affecting the pitch or material conveying effect, thus ensuring the accuracy of thickness control during asphalt concrete paving.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and specifically to a device for controlling the thickness of asphalt concrete paving. Background Technology

[0002] Asphalt concrete paving equipment generally consists of two core components: a auger and a screed. By controlling the elevation angle of the screed, the force and height required for it to "climb" over the preceding material pile can be controlled, thereby controlling the thickness of the asphalt concrete paving. The auger ensures uniform material delivery to accommodate the operation of the screed.

[0003] For example, the patent document with authorization announcement number CN119041271B, authorization announcement date February 14, 2025, entitled "A Paver and Paver Machine," includes a frame, a drive mechanism, and a paving mechanism. A clutch restricts the rotation of the third paving section relative to the sliding frame. The first paving section rotates under the drive mechanism. Combined with the threaded engagement between the first and second paving sections, the sliding frame, the second paving section, and the third paving section can all move away from the fixed frame to adjust the length of the paving mechanism.

[0004] In the prior art, in order to adapt to the laying width, the length of the spiral shaft is set to be adjustable. However, there is a problem: if the overlapping part of the two adjustable conveying shafts is set with spiral structure, the spiral structure will interfere and affect the adjustment range of the overall spiral shaft; if the overlapping part of the two adjustable conveying shafts is set with only one set of spiral structure, the extended part of the overall spiral shaft will not have spiral structure after it is extended, which will greatly affect the uniformity of material conveying and thus affect the control of laying thickness. Summary of the Invention

[0005] The purpose of this invention is to provide an asphalt concrete paving thickness control device to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An asphalt concrete paving thickness control device includes a frame and a screed plate mounted on the main body of the paving equipment. A first spiral shaft is rotatably connected to the frame. The device also includes a movable frame slidably mounted on the frame, and a second spiral shaft is rotatably connected to the movable frame. The first spiral shaft has a spiral groove adapted to the second spiral shaft.

[0008] The aforementioned asphalt concrete paving thickness control device includes a first spiral shaft comprising a first rotating shaft and a first spiral plate, and a second spiral shaft comprising a second rotating shaft and a second spiral plate.

[0009] In the aforementioned asphalt concrete paving thickness control device, the pitch of the first spiral plate and the second spiral plate are the same.

[0010] The aforementioned asphalt concrete paving thickness control device has a spiral groove structured within a first rotating shaft and a first spiral plate, wherein the first rotating shaft has a movable groove that communicates with the spiral groove and is adapted to a second rotating shaft.

[0011] The aforementioned asphalt concrete paving thickness control device has an outer rod on the frame and an inner rod that is sleeved on the movable frame.

[0012] The aforementioned asphalt concrete paving thickness control device further includes a drive assembly for driving the first helical shaft to rotate.

[0013] The above-mentioned asphalt concrete paving thickness control device has two scrapers movably arranged on the first spiral shaft. The two scrapers are located at one end of the spiral groove near the movable frame, and the two scrapers have scraping positions that fit against the outer wall of the second spiral plate.

[0014] The above-mentioned asphalt concrete paving thickness control device has a first auxiliary spiral and a second auxiliary spiral movably arranged on the first spiral shaft, and two scrapers are respectively fixed on the first auxiliary spiral and the second auxiliary spiral.

[0015] In the aforementioned asphalt concrete paving thickness control device, both the first auxiliary screw and the second auxiliary screw are slidably connected to the first rotating shaft.

[0016] In the aforementioned asphalt concrete paving thickness control device, both the frame and the movable frame are slidably connected to the main body.

[0017] In the above technical solution, the present invention provides an asphalt concrete paving thickness control device, in which a second spiral shaft is movably disposed in a spiral groove, so that the first and second spiral shafts form a thread-like connection. With this configuration, when the first and second spiral shafts rotate relative to each other, the overall spiral shaft formed by them can lengthen or shorten. During this process, the movable frame slides adaptively, thereby adjusting the overall spiral shaft length. Furthermore, during adjustment, the overlapping portion of the first and second spiral shafts is drawn into the spiral groove, without affecting the pitch or material conveying effect, thus ensuring the accuracy of thickness control during asphalt concrete paving. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0020] Figure 2 A front view provided for yet another embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of a spiral groove structure provided in another embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of a scraper structure provided in another embodiment of the present invention;

[0023] Figure 5 This is a cross-sectional view of the movable frame provided in another embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the second friction part provided in another embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of a connecting rod structure provided in another embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Main body; 2. Frame; 3. First spiral shaft; 31. First rotating shaft; 32. First spiral plate; 4. Movable frame; 5. Second spiral shaft; 51. Second rotating shaft; 52. Second spiral plate; 6. Spiral groove; 7. Scraper; 8. First auxiliary spiral; 9. Second auxiliary spiral; 10. Lifting groove; 11. Lifting block; 12. Slide rod; 13. First friction part; 14. Protrusion; 15. Movable rod; 16. Wedge block; 17. Wedge end; 18. Spring; 19. Second friction part; 20. Connecting rod; 21. Outer rod; 22. Inner rod. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Reference Figure 1-7 This invention provides an asphalt concrete paving thickness control device, including a frame 2 and a screed plate mounted on the main body 1 of the paving equipment. A first spiral shaft 3 is rotatably connected to the frame 2, and a movable frame 4 is slidably mounted on the frame 2. A second spiral shaft 5 is rotatably connected to the movable frame 4. A spiral groove 6 adapted to the second spiral shaft 5 is constructed inside the first spiral shaft 3.

[0030] Specifically, the paving equipment is generally an asphalt concrete paving device such as an asphalt paver. The main body 1 refers to the structure on the paving equipment connected to the auger shaft and screed. During asphalt concrete paving, the conveying structure on the paving equipment transports the material to the auger shaft, which then distributes the material evenly laterally. Finally, the screed compacts and smooths the material. In existing technologies, the width of the screed can be adjusted based on the width of the road being paved. These are all existing technologies and will not be elaborated upon here. The innovation of this invention lies in the provision of a first auger shaft 3 and a second auger shaft 5 on the frame 2. These two shafts are connected together via a auger groove 6 to form a threaded connection, allowing the first auger shaft 3 and the second auger shaft 5 to extend or shorten as a whole. During this extension / retraction process, the overall auger shaft structure (i.e., the combination of the first auger shaft 3 and the second auger shaft 5) will not experience any loss of auger structure or change in pitch, thus maintaining the material conveying effect as much as possible and evenly distributing the material in front of the screed. This minimizes the impact of screed width adjustment on the accuracy of thickness control during asphalt concrete paving.

[0031] It should be noted that both the auger and the ironing plate are core structures in the process of controlling the laying thickness. The rotation speed and height of the auger are core parameters for controlling the laying thickness. This embodiment of the invention adds the function of adjusting the length of the auger. This can be seen as adapting to the adjustment of the laying thickness (when the laying thickness remains unchanged but the laying width increases, if the length of the auger remains unchanged, uneven material distribution will occur, leading to uneven material laying thickness. Obviously, the length of the auger has a significant impact on the control of the laying thickness, especially at the edges, in terms of the overall width). It can also be seen as adapting to the adjustment of the laying width. Both are to improve the uniformity of the material in front of the ironing plate, so that the ironing plate can better control the laying thickness and laying width.

[0032] In another embodiment of the present invention, the first spiral shaft 3 includes a first rotating shaft 31 and a first spiral plate 32, and the second spiral shaft 5 includes a second rotating shaft 51 and a second spiral plate 52. The first spiral plate 32 and the second spiral plate 52 have the same pitch. The spiral groove 6 is constructed within the first rotating shaft 31 and the first spiral plate 32, and the first rotating shaft 31 has a movable groove that communicates with the spiral groove 6 and is adapted to the second rotating shaft 51. Specifically, the first rotating shaft 31 and the second rotating shaft 51 are coaxially arranged, and the diameter of the first rotating shaft 31 is larger than the diameter of the second rotating shaft 51; the spiral paths of the first spiral plate 32 and the second spiral are the same, but their thicknesses are different, so that the second spiral plate 52 and the second rotating shaft 51 can be movably arranged in the spiral groove 6 and the movable groove. When the first spiral shaft 3 and the second spiral shaft 5 rotate relative to each other, the second spiral plate 52 rotates and moves axially within the spiral groove 6, and the second rotating shaft 51 also rotates and moves axially within the movable groove accordingly. The advantage of this arrangement is that, in this embodiment, when the second spiral shaft 5 retracts into the spiral groove 6, the distance between the movable frame 4 and the frame 2 is adjusted accordingly, and the material is mainly conveyed through the first spiral shaft 3. When the second spiral shaft 5 extends out of the spiral groove 6, the second rotating shaft 51 acts as an extension of the first rotating shaft 31, and the second spiral plate 52 acts as an extension of the first spiral plate 32. At this time, the distance between the movable frame 4 and the frame 2 is adjusted accordingly, so that the material is conveyed together through the first spiral shaft 3 and the second spiral shaft 5, thereby improving the uniformity of the material in front of the ironing plate and minimizing the accumulation of material.

[0033] In the above embodiments, the sliding connection between the movable frame 4 and the frame 2 can be achieved using existing technologies such as guide rails and lead screws. Preferably, the frame 2 has an outer rod 21, and the movable frame 4 has an inner rod 22 that is sleeved with the outer rod 21. Specifically, the outer rod 21 and the inner rod 22 are coaxially arranged and both are parallel to the axial direction of the first spiral shaft 3. The outer rod 21 has a telescopic groove along its axial direction, and the inner rod 22 is slidably connected in the telescopic groove, so that the movable frame 4 and the frame 2 can slide relative to each other through the inner rod 22 and the outer rod 21.

[0034] Furthermore, it also includes a drive assembly for driving the first spiral shaft 3 to rotate. Specifically, the drive assembly is mounted on the frame 2, and can be a drive structure such as a motor (not shown, and not described in detail) from the prior art, to drive the first spiral shaft 3 to rotate on the frame 2. Optionally, a telescopic mechanism is provided between the frame 2 and the movable frame 4 to control their relative proximity or distance. In this way, the overall length of the first spiral shaft 3 and the second spiral shaft 5 can be controlled by the telescopic mechanism in conjunction with the drive assembly. After the overall length is adjusted, when the drive assembly drives the first spiral shaft 3 to rotate to transport materials, the telescopic mechanism does not operate, so that the first spiral shaft 3 can drive the second spiral shaft 5 to rotate synchronously, thereby jointly transporting materials.

[0035] In another embodiment of the present invention, two scrapers 7 are movably disposed on the first spiral shaft 3. The two scrapers 7 are located at one end of the spiral groove 6 near the movable frame 4, and the two scrapers 7 have scraping positions that conform to the outer wall of the second spiral plate 52. Specifically, the two scrapers 7 are located at one end of the first spiral plate 32 near the movable frame 4. When the two scrapers 7 are in the scraping position, they can form an extension structure of the first spiral plate 32 and conform to the outer wall of the second spiral plate 52. The connection between the two scrapers 7 and the first spiral shaft 3 can be a sliding connection or a rotating connection, so that the scrapers 7 can move closer to or further away from the second spiral plate 52. In this embodiment, the spiral groove 6 and its width can be slightly larger than the thickness of the second spiral plate 52, so that the second spiral plate 52 can have a certain amount of room to move in the spiral groove 6, and avoid the second spiral plate 52 getting stuck in the first spiral plate 32 as much as possible. In order to prevent impurities from entering the spiral groove 6, two scrapers 7 are provided in this embodiment. When the first spiral shaft 3 and the second spiral shaft 5 are in use, both scrapers 7 are in the scraping position to block the spiral groove 6 and prevent impurities from entering the spiral groove 6 as much as possible. When it is necessary to adjust the length of the overall spiral shaft, the two scrapers 7 can be controlled to move closer to or further away from the scraping position based on the cleanliness of the outer wall of the second spiral plate 52. If there are no impurities on the outer wall of the second spiral plate 52, the two scrapers 7 can be moved away from the scraping position to minimize the resistance to the adjustment of the overall spiral shaft length.

[0036] Preferably, a first auxiliary spiral 8 and a second auxiliary spiral 9 are movably disposed on the first spiral shaft 3, and two scrapers 7 are respectively fixed on the first auxiliary spiral 8 and the second auxiliary spiral 9. Both the first auxiliary spiral 8 and the second auxiliary spiral 9 are slidably connected to the first rotating shaft 31. Specifically, in this embodiment, the pitch and spiral path of the first auxiliary spiral 8 and the second auxiliary spiral 9 are the same as those of the first spiral plate 32. The difference is that the first auxiliary spiral 8 and the second auxiliary spiral 9 can slide along the axial direction of the first rotating shaft 31 (the sliding drive method can be an existing electric telescopic rod or cylinder, etc., which will not be described in detail here and is not illustrated). The advantage of this arrangement is that by controlling the sliding of the first auxiliary spiral 8 and the second auxiliary spiral 9 on the first rotating shaft 31, the two scrapers 7 can be moved closer to or away from the scraping position; when controlling the sliding of the first auxiliary spiral 8 and the second auxiliary spiral 9 along the first rotating shaft 31, impurities adhering to the first rotating shaft 31 can be cleaned; and when the first auxiliary spiral 8 and the second auxiliary spiral 9 are in contact with the outer wall of the first spiral plate 32, they can support the first spiral plate 32.

[0037] In another embodiment of the present invention, both the frame 2 and the movable frame 4 are slidably connected to the main body 1. Specifically, the main body 1 is provided with multiple lifting grooves 10, and both the frame 2 and the movable frame 4 are provided with lifting blocks 11 adapted to the lifting grooves 10, so that the frame 2 and the movable frame 4 can be synchronously raised and lowered relative to the main body 1 (the lifting drive method can be a hydraulic cylinder or pneumatic cylinder, etc., as in the prior art, which will not be described in detail here and is not illustrated). With this configuration, when the width of the ironing board or the laying thickness increases, the amount of material conveyed to the front of the ironing board will also increase. Adjusting the height of the frame 2 and the movable frame 4 based on the height of the material accumulation helps to improve the uniformity of material conveying.

[0038] Furthermore, the movable frame 4 is equipped with an alternating locking mechanism, which has a first state of locking the relative position of the movable frame 4 and the second rotating shaft 51, and a second state of locking the relative position of the outer rod 21 and the inner rod 22. The alternating locking mechanism can be one of two sets of locking mechanisms in the prior art, which can switch between the first and second states by alternating operation of the two sets of locking mechanisms (that is, when one set of locking mechanisms is running, the other set is not running). When the frame 2 and the movable frame 4 rise to the top of their stroke, the alternating locking mechanism is in the first state. At this time, the drive assembly drives the first spiral shaft 3 and the second spiral shaft 5 to rotate relative to each other, which can adjust the length of the overall spiral shaft and the distance between the frame 2 and the movable frame 4. After the frame 2 and the movable frame 4 leave the top of their stroke, the alternating locking mechanism switches to the second state, so that the drive assembly drives the first spiral shaft 3 and the second spiral shaft 5 to rotate synchronously. Specifically, the alternating locking mechanism includes a slide rod 12 slidably connected to one side of the movable frame 4 (the slide rod 12 slides vertically on the movable frame 4, and the sliding method can be a slide rail or guide rail structure in the prior art, which will not be described in detail). The bottom end of the slide rod 12 is provided with a first friction part 13 adapted to the second rotating shaft 51. The main body 1 is provided with a protrusion 14. The inner rod 22 is provided with a movable cavity, and a movable rod 15 is slidably arranged in the movable cavity. The inner rod 22 is provided with a through hole adapted to the slide rod 12. The slide rod 12 is inserted into the through hole and the slide rod 12 and the movable rod 15 are misaligned (the two do not interfere with each other). The end of the slide rod 12 near the movable rod 15 is provided with a wedge shape. Block 16, the movable rod 15 near the slide rod 12 has a wedge-shaped end 17 adapted to the wedge block 16. The movable cavity is provided with a spring 18 for forcing the movable rod 15 to approach the slide rod 12. One end of the spring 18 is fixed to the outer wall of the slide rod 12, and the other end is fixed to the inner wall of the movable cavity, so that the movable rod 15 is forced to approach the slide rod 12 by the spring 18. The inner rod 22 is provided with a connecting groove. The bottom of the connecting groove communicates with the movable cavity, and the top communicates with the outside (or communicates with the telescopic groove). A second friction part 19 is slidably provided in the connecting groove. The bottom of the second friction part 19 is hinged to a connecting rod 20. The other end of the connecting rod 20 is hinged to the movable rod 15.

[0039] With this configuration, when frame 2 and movable frame 4 are at the bottom of their travel (e.g.) Figure 7 As shown, that is, when the slide bar 12 is not in contact with the protrusion 14, the movable rod 15 approaches the slide bar 12 under the action of the spring 18, so as to force the wedge block 16 and the slide bar 12 to rise through the wedge end 17 (the slide bar 12 is at the top of its sliding stroke), thereby releasing the first friction part 13 from contact and locking the second rotating shaft 51. At the same time, the movable rod 15 can drive the second friction part 19 away from the movable cavity along the connecting groove through the connecting rod 20, and then the second friction part 19 abuts against the inner wall of the outer rod 21, thereby locking the relative position of the outer rod 21 and the inner rod 22. This is the second state of the alternating locking mechanism; when the frame 2 and the movable frame 4 rise synchronously to the top of their stroke (such as Figure 5 and Figure 6 As shown), the slide rod 12 and the protrusion 14 on the main body 1 abut against each other, forcing the slide rod 12 to move downward relative to the movable frame 4 (so that the slide rod 12 moves to the bottom of its sliding stroke), thereby abutting against the outer wall of the second rotating shaft 51 through the first friction part 13 to lock the relative position of the movable frame 4 and the second rotating shaft 51. At the same time, the downward movement of the slide rod 12 relative to the movable frame 4 can force the wedge end 17 and the movable rod 15 away from the slide rod 12 through the wedge block 16, and then drive the second friction part 19 into the connecting groove through the connecting rod 20, thereby releasing the lock on the relative position of the outer rod 21 and the inner rod 22. This is the first state of the alternating locking mechanism. The advantage is that, in this embodiment, when the overall spiral shaft is not in use, driving the frame 2 and the movable frame 4 to rise relative to the main body 1 can increase the height of the overall spiral shaft, minimizing damage to the spiral shaft; when the length of the overall spiral shaft needs to be adjusted, driving the frame 2 and the movable frame 4 to rise synchronously to the top of their stroke can passively switch the alternating locking mechanism to the first state, facilitating the adjustment of the length of the overall spiral shaft through the drive component, and during the adjustment process, the distance between the movable frame 4 and the frame 2 can be passively adjusted; after the length of the overall spiral shaft is adjusted, driving the frame 2 and the movable frame 4 to descend synchronously can passively switch the alternating locking mechanism to the second state, locking the relative positions of the inner rod 22 and the outer rod 21, minimizing the displacement of the movable frame 4 during the operation of the overall spiral shaft.

[0040] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An asphalt concrete paving thickness control device, comprising a frame and a screed mounted on the main body of the paving equipment, wherein a first helical shaft is rotatably connected to the frame, characterized in that, It also includes a movable frame that is slidably mounted on the frame, and a second spiral shaft is rotatably connected to the movable frame. The first spiral shaft has a spiral groove that is adapted to the second spiral shaft. The first spiral shaft includes a first rotating shaft and a first spiral plate, and the second spiral shaft includes a second rotating shaft and a second spiral plate; The first and second spiral plates have the same pitch; The spiral groove is constructed within the first rotating shaft and the first spiral plate, and the first rotating shaft has a movable groove that communicates with the spiral groove and is adapted to the second rotating shaft.

2. The asphalt concrete paving thickness control device according to claim 1, characterized in that, The frame has an outer rod, and the movable frame has an inner rod that is sleeved with the outer rod.

3. The asphalt concrete paving thickness control device according to claim 1, characterized in that, It also includes a drive assembly for driving the first helical shaft to rotate.

4. The asphalt concrete paving thickness control device according to claim 1, characterized in that, Two scrapers are movably mounted on the first spiral shaft. The two scrapers are located at one end of the spiral groove near the movable frame, and the two scrapers have scraping positions that fit against the outer wall of the second spiral plate.

5. The asphalt concrete paving thickness control device according to claim 4, characterized in that, A first auxiliary spiral and a second auxiliary spiral are movably disposed on the first spiral shaft, and two scrapers are respectively fixed on the first auxiliary spiral and the second auxiliary spiral.

6. The asphalt concrete paving thickness control device according to claim 5, characterized in that, Both the first auxiliary spiral and the second auxiliary spiral are slidably connected to the first rotating shaft.

7. The asphalt concrete paving thickness control device according to claim 1, characterized in that, Both the frame and the movable frame are slidably connected to the main body.

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