Telescopic asphalt spraying beam

Abstract

The utility model discloses a telescopic asphalt spraying beam which comprises a transversely arranged main frame body, a first auxiliary frame body and a second auxiliary frame body, the first auxiliary frame body and the second auxiliary frame body are connected to the two longitudinal sides of the main frame body through supporting frames correspondingly. A driving part is arranged on the supporting frame, and under the action of the driving part, the first auxiliary frame body and the second auxiliary frame body transversely move on the main frame body so that the first auxiliary frame body and the second auxiliary frame body can be staggered with the main frame body; the main frame body, the first auxiliary frame body and the second auxiliary frame body are each provided with a plurality of asphalt spray heads arranged at intervals in the length direction of the main frame body, the first auxiliary frame body and the second auxiliary frame body. The main frame body, the first auxiliary frame body and the second auxiliary frame body are each internally provided with a cavity for providing asphalt for the asphalt spray head. The problems that the efficiency is low and the levelness of the spraying beam is difficult to accurately control due to manual operation can be avoided, and the whole structure is simple and compact, small in occupied space and suitable for different use environments due to the adoption of a telescopic unfolding mode.

Description

Technical Field

[0001] This utility model relates to asphalt spraying technology, belonging to the field of road engineering construction, and specifically relates to a telescopic asphalt spraying beam. Background Technology

[0002] Asphalt distributors are widely used in road construction for highways, urban roads, airports, ports and reservoirs. Their core function is to achieve uniform asphalt distribution on the road base or surface layer, providing a foundation for subsequent paving or surface treatment. The spraying mechanism needs to install multiple asphalt nozzles on the spraying beam. The position of the spraying beam is adjusted to match different road widths, so that the asphalt nozzles can act evenly on the road surface.

[0003] Currently, the asphalt spraying beam of asphalt distributors is mainly unfolded and folded by manual operation or auxiliary mechanical devices (such as gears and linkages). Manual operation is wasteful of manpower, inefficient, time-consuming, and labor-intensive. Manual adjustment relies on experience and judgment, making it difficult to accurately control the horizontality of the spraying beam. For example, a height difference of >5mm can lead to a spraying volume deviation of >±5%, easily resulting in "sawtooth" boundaries or uneven overlap. Furthermore, frequent manual operation increases the risk of burns due to insufficient protection from contact with hot asphalt. Auxiliary mechanical devices mainly use rotation or telescopic methods. For example, CN206204740U discloses a telescopic asphalt distributor that facilitates continuous adjustment of the spraying area. The disclosed technical solution uses a cycloidal motor as a rotating drive to rotate the left and right spraying devices around the two ends of the central spraying device. However, the problem is that the space created by the rotation and unfolding is large, making it unsuitable for special operating environments. Summary of the Invention

[0004] The purpose of this utility model is to provide a telescopic asphalt spraying beam, which not only avoids the problems of low efficiency and difficulty in accurately controlling the level of the spraying beam caused by manual operation, but also adopts a telescopic unfolding method, making the overall structure simple and compact, occupying little space, and suitable for different usage environments.

[0005] To achieve the above objectives, this telescopic asphalt spraying beam includes:

[0006] The main frame is arranged horizontally.

[0007] The first and second sub-frames are arranged horizontally and connected to the longitudinal sides of the main frame by support frames, respectively.

[0008] The support frame is equipped with a driving component. Under the action of the driving component, the first sub-frame and the second sub-frame move laterally on the main frame so that they can be offset from the main frame respectively.

[0009] The main frame, the first sub-frame, and the second sub-frame are each equipped with multiple asphalt nozzles arranged at intervals along their length.

[0010] The main frame, the first sub-frame, and the second sub-frame are all equipped with cavities for supplying asphalt to the asphalt nozzles.

[0011] In some examples of this utility model, the cavity structures of the first sub-frame and the second sub-frame are the same, each having a first cavity and multiple second cavities;

[0012] Multiple second cavities are laterally spaced and connected to corresponding asphalt nozzles, and all are connected to the first cavity through through holes. The end of the first cavity is provided with a connector and is connected to the asphalt tank through a connecting pipe.

[0013] The through-hole is equipped with an opening and closing component. When the first sub-frame and the second sub-frame overlap with the main frame in the horizontal direction, the through-hole at the overlapping section is closed by the opening and closing component.

[0014] In some examples of this utility model, the opening and closing element is a top rod that slides up and down within the second cavity;

[0015] The push rod is subjected to an upward elastic force, and its upper part extends to the outside, while its lower end is a sealing block;

[0016] The main frame is provided with a limiting plate that is arranged along its length and located above the top rod;

[0017] When the limiting plate contacts the push rod, the sealing block at the lower end of the push rod can seal the through hole. When the limiting plate and the push rod are misaligned, the sealing block at the lower end of the push rod can open the through hole.

[0018] In some examples of this utility model, an elastic element is fitted on the upper part of the top rod, one end of which contacts the first sub-frame or the second sub-frame, and the other end contacts the shoulder of the top rod.

[0019] The push rod inside the second cavity is equipped with a limiting block to limit the upward movement of the push rod;

[0020] The top end of the push rod is a cylindrical head or has rollers, and one end of the limiting plate at the overlapping section is an upward arc structure.

[0021] In some examples of this utility model, the through hole is an inverted frustum structure, the sealing block is an elastic body, and the lower part is a column structure that matches the frustum and the upper part is a column structure with an outer diameter larger than the frustum.

[0022] In some examples of this utility model, the driving component has a driving member and a pair of transversely arranged and rotatably mounted on a corresponding support frame;

[0023] The first and second sub-frames are each equipped with lugs that are threadedly connected to the corresponding drive shafts.

[0024] The driving component drives a pair of transmission shafts to rotate.

[0025] In some examples of this utility model, the driving element is a pair of hydraulic motors;

[0026] Each hydraulic motor is fixedly connected to the support frame, and its output end is connected to the drive shaft; each pair of hydraulic motors is connected to a controller, which controls the movement of the drive components.

[0027] In some examples of this utility model, the driving component is a hydraulic motor;

[0028] The output end of the hydraulic motor is connected to the end side of one of the drive shafts, and a first gear and a second gear that mesh with each other are respectively provided on the pair of drive shafts;

[0029] Under the action of the driving component, the first sub-frame and the second sub-frame move closer to each other and further apart.

[0030] In some examples of this utility model, the main frame is provided with a sensor for identifying the positions of the first sub-frame and the second sub-frame;

[0031] The sensor is connected to the controller, and the controller controls the movement of the drive component.

[0032] Compared with existing technologies, the first and second sub-frames of this telescopic asphalt spraying beam retract and fold and extend by moving laterally with the drive component and changing their position relative to the main frame, so as to be suitable for different asphalt spraying widths. This avoids the problems of low efficiency and difficulty in accurately controlling the level of the spraying beam caused by manual operation. The telescopic unfolding method makes the overall structure simple and compact, occupies little space, and is suitable for different usage environments.

[0033] Since the first cavity in the first sub-frame and the second sub-frame are connected to multiple second cavities through through holes, when the first sub-frame and the second sub-frame overlap with the main frame in the lateral direction, the through holes at the overlapping section are closed by the opening and closing parts. Therefore, the telescopic structure can not only be applied to roads of different widths, but also avoids the problem of uneven spraying caused by secondary spraying in the overlapping section. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the present invention in a retracted and folded state;

[0035] Figure 2 This is a schematic diagram of the present invention in its extended and unfolded state;

[0036] Figure 3 This is a top view of an example of the driving component in this utility model;

[0037] Figure 4 This is a top view of another example of the driving component in this utility model;

[0038] Figure 5 This is a front view of the connection between the first cavity and the second cavity of the first sub-frame in this utility model;

[0039] Figure 6 This is a left view of the connection between the push rod and the limiting plate in this utility model;

[0040] Figure 7 This is a front view of the push rod blocking the through hole in this utility model;

[0041] Figure 8 This is a top view of the first sub-frame and the main frame at the overlapping section in this utility model;

[0042] In the diagram: 10. Main frame;

[0043] 20. Asphalt nozzle;

[0044] 30. First sub-frame; 31. First cavity; 32. Second cavity; 33. Connector; 34. Through hole;

[0045] 40. Second sub-frame;

[0046] 50. Support frame; 51. Drive shaft; 52. Drive component; 53. Ear seat; 54. First gear; 55. Second gear;

[0047] 61. Limiting plate; 62. Top rod; 63. Elastic element; 64. Sealing block; 65. Limiting block. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0049] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0050] like Figure 1 , Figure 2 As shown, this telescopic asphalt spraying beam includes:

[0051] Main frame 10, arranged horizontally;

[0052] The first sub-frame 30 and the second sub-frame 40 are arranged horizontally and are respectively connected to the longitudinal sides of the main frame 10 through the support frame 50.

[0053] The support frame 50 is equipped with a driving component. Under the action of the driving component, the first sub-frame 30 and the second sub-frame 40 move laterally on the main frame 10 so that they can be offset from the main frame 10 respectively.

[0054] Among them, the main frame 10, the first sub-frame 30, and the second sub-frame 40 are each equipped with multiple asphalt nozzles 20 arranged at intervals along their length.

[0055] The main frame 10, the first sub-frame 30, and the second sub-frame 40 are all equipped with cavities for supplying asphalt to the asphalt nozzle 20;

[0056] Specifically, the main frame 10 is installed on the asphalt distributor truck and serves as the main support structure for asphalt spraying;

[0057] The first sub-frame 30 and the second sub-frame 40 are arranged in the same direction as the main frame 10 and can move laterally relative to the main frame 10. This movement can cause the first sub-frame 30 and the second sub-frame 40 to be staggered from the main frame 10, thereby increasing the spraying width through telescopic movement. Support frames 50 are provided on both longitudinal sides of the main frame 10, and the support frames 50 are used to connect the first sub-frame 30 and the second sub-frame 40.

[0058] The asphalt nozzles 20 are installed on the corresponding frames and can atomize and spray high-pressure asphalt. That is, the asphalt tank is connected to the connectors 33 on the end sides of the main frame 10, the first sub-frame 30, and the second sub-frame 40 through a hose to inject high-pressure asphalt into the cavity. This is the prior art and will not be described further. Preferably, there are more asphalt nozzles 20 on the main frame 10 and fewer asphalt nozzles 20 on the first sub-frame 30 and the second sub-frame 40 on both sides.

[0059] When this telescopic asphalt spraying beam is initially used, the first sub-frame 30 and the second sub-frame 40 retract and fold to the longitudinal side of the main frame 10. The positions of the first sub-frame 30 and the second sub-frame 40 relative to the main frame 10 are adjusted according to the asphalt spraying width. That is, the first sub-frame 30 and the second sub-frame 40 move on the main frame 10 to extend and unfold. The overall width of the first sub-frame 30, the main frame 10, and the second sub-frame 40 is adjusted by staggering them. It should be noted that the extension refers to the first sub-frame 30 and the second sub-frame 40 having less or no overlap with the main frame 10, while the retraction refers to the first sub-frame 30 and the second sub-frame 40 having more or complete overlap with the main frame 10. This spraying beam can avoid the problems of low efficiency and difficulty in accurately controlling the level of the spraying beam caused by manual operation. The telescopic unfolding method makes the overall structure simple and compact, occupies little space, and is suitable for different usage environments.

[0060] In some examples of this utility model, such as Figure 5 , Figure 6 As shown, the first sub-frame 30 and the second sub-frame 40 have the same cavity structure, each having a first cavity 31 and multiple second cavities 32;

[0061] Multiple second cavities 32 are laterally spaced and connected to corresponding asphalt nozzles 20, and are all connected to the first cavity 31 through through holes 34. The end side of the first cavity 31 is provided with a connector 33 and is connected to the asphalt tank through a connecting pipe.

[0062] Among them, the through hole 34 is provided with an opening and closing component. When the first sub-frame 30 and the second sub-frame 40 overlap with the main frame 10 in the horizontal direction, the through hole 34 at the overlapping section is closed by the opening and closing component.

[0063] Specifically, such as Figure 8As shown, when asphalt spraying is carried out on roads of different widths, the first sub-frame 30 and the second sub-frame 40 are not fully extended on the main frame 10, and there is an overlap between the corresponding sub-frames and the main frame 10. Taking the overlap between the first sub-frame 30 and the main frame 10 as an example, this overlap causes the asphalt nozzle 20 on the main frame 10 and the asphalt nozzle 20 on the first sub-frame 30 to spray twice, resulting in uneven spraying. Moreover, the length of the overlap varies depending on the width of the road.

[0064] The main frame 10 is a single, integral cavity, meaning that all the asphalt nozzles 20 on it can spray asphalt simultaneously. The cavities on the first sub-frame 30 and the second sub-frame 40 consist of a first cavity 31 and multiple second cavities 32, achieving the goal of not spraying asphalt in overlapping sections; for example... Figure 5 As shown, the first cavity 31 is located at the bottom, and the connector 33 on the end side is connected to the asphalt tank through a connecting pipe. Multiple second cavities 32 are located at the top and are separated and independent from each other, which can provide asphalt to the corresponding asphalt nozzles 20. When the first sub-frame 30 and the second sub-frame 40 move, the asphalt nozzles 20 at the overlapping section with the main frame 10 do not work, thus avoiding the problem of uneven spraying caused by secondary spraying in the overlapping section.

[0065] The opening and closing element is used to open and close the connection between the first cavity 31 and the second cavity 32. As an example, the opening and closing element can be an electrically controlled valve. A sensor is set on the end side of the main frame 10 to monitor the movement position of the first sub-frame 30 and the second sub-frame 40. When the first sub-frame 30 and the second sub-frame 40 extend, the controller receives the signal from the sensor and determines the number of asphalt nozzles 20 at the overlapping section. Then, it controls the opening and closing element to be in the closed state, and the asphalt nozzles 20 in other extended sections are in the open state. Then, the asphalt in the first cavity 31 enters the second cavity 32 to provide asphalt spraying for the asphalt nozzles 20. However, this example requires complex control, resulting in a complex overall structure.

[0066] As another example of an opening and closing mechanism, such as Figures 5 to 7 As shown, the opening and closing element is a push rod 62 that slides up and down within the second cavity 32;

[0067] The push rod 62 is subjected to an upward elastic force, and its upper part extends to the outside, while its lower end is a sealing block 64;

[0068] The main frame 10 is provided with a limiting plate 61 that is arranged along its length and located above the top rod 62;

[0069] When the limiting plate 61 contacts the push rod 62, the sealing block 64 at the lower end of the push rod 62 can seal the through hole 34. When the limiting plate 61 and the push rod 62 are misaligned, the sealing block 64 at the lower end of the push rod 62 can open the through hole 34.

[0070] Specifically, the limiting plate 61 can be an inverted L-shaped structure, with its lower end fixedly connected to the main frame 10 by means of threads or welding;

[0071] When the first sub-frame 30 is in the retracted state, the upper end of the top rod 62 contacts the limiting plate 61. That is, when the limiting plate 61 limits the position, the top rod 62 is in the compressed state and the lower end of the sealing block 64 closes the through hole 34 in a contact manner.

[0072] When the first sub-frame 30 moves laterally and extends, at the overlapping section, the top rod 62 of the first sub-frame 30 is still limited by the limiting plate 61. The asphalt in the first cavity 31 cannot enter the second cavity 32 at the overlapping section, that is, the asphalt nozzle 20 at the overlapping section does not perform spraying operation. At the non-overlapping section, that is, when the limiting plate 61 and the top rod 62 are misaligned, the top rod 62 moves upward under the action of upward elastic force or high pressure asphalt in the first cavity 31. The sealing block 64 opens the through hole 34, and the asphalt in the first cavity 31 normally enters the second cavity 32 of the non-overlapping section. The asphalt nozzle 20 of the non-overlapping section sprays normally. Correspondingly, the same applies when the second sub-frame 40 moves and extends. This example not only makes it applicable to different widths of road surface through the telescopic structure, but also avoids the problem of uneven spraying caused by secondary spraying in the overlapping section.

[0073] In some examples of this utility model, such as Figure 6 , Figure 7 As shown, an elastic element 63 is fitted on the upper part of the top rod 62. One end of the elastic element 63 contacts the first sub-frame 30 or the second sub-frame 40, and the other end contacts the shoulder of the top rod 62.

[0074] The push rod 62 inside the second cavity 32 is provided with a limiting block 65 that limits the upward movement of the push rod 62;

[0075] The top end of the push rod 62 is a cylindrical head or is equipped with rollers, and one end of the limiting plate 61 at the overlapping section is an upward arc-shaped structure;

[0076] Specifically, the elastic element 63 can be a cylindrical spring fitted onto the push rod 62;

[0077] The limiting block 65 is used to limit the push rod 62 to prevent the lower part of the push rod 62 from disengaging from the second cavity 32 under the action of the elastic element 63;

[0078] The top end of the push rod 62 is a cylindrical head or has a roller structure, and one end of the limiting plate 61 is an upward arc structure, which can ensure that when the first sub-frame 30 and the second sub-frame 40 retract, the push rod 62 can smoothly contact the limiting plate 61 and move downward to continue to close the corresponding through hole 34.

[0079] Furthermore, such as Figure 7As shown, the through hole 34 is an inverted frustum structure, the sealing block 64 is an elastic body, and the lower part is a cylindrical structure that matches the frustum and the upper part is a cylindrical structure with an outer diameter larger than the frustum.

[0080] Specifically, when the sealing block 64 closes the through hole 34, the lower part of the sealing block 64 can be embedded in the through hole 34 for primary sealing, and the upper column can contact the upper end face of the through hole 34 for secondary sealing, so as to ensure the sealing performance.

[0081] In some examples of this utility model, the driving component has a driving member 52 and a pair of transversely arranged and rotatably mounted on corresponding support frames 50;

[0082] The first sub-frame 30 and the second sub-frame 40 are each provided with a lug 53 that is threadedly connected to the corresponding drive shaft 51;

[0083] The driving component 52 drives a pair of transmission shafts 51 to rotate;

[0084] Specifically, the drive component 52 can be a hydraulic motor, which is connected to the support frame 50 by fastening screws. The power source (hydraulic port) of the hydraulic motor is connected to the hydraulic system of the asphalt distributor. The forward and reverse rotation of the hydraulic motor (with symmetrical internal structure) is automatically controlled by controlling the hydraulic system. When the drive component 52 is started, it can drive a pair of drive shafts 51 to rotate in both directions. Therefore, the first sub-frame 30 and the second sub-frame 40 are moved on the support frame 50 through threaded connection.

[0085] As can be seen, to ensure the stability of the movement of the corresponding sub-frames, the first sub-frame 30 and the second sub-frame 40 can be connected to the support frame 50 by slide rails, or the support frame 50 is provided with horizontally arranged guide rods, and the linear bearings on the first sub-frame 30 and the second sub-frame 40 are slidably connected to the guide rods.

[0086] As an example of a driver, such as Figure 3 As shown, the driving component 52 is a pair of hydraulic motors;

[0087] Each hydraulic motor is fixedly connected to the support frame 50, and its output end is connected to the drive shaft 51; a pair of hydraulic motors are respectively connected to the controller, and the controller controls the movement of the drive component 52.

[0088] Specifically, each hydraulic motor can be controlled independently, and this controller is the hydraulic control system;

[0089] When the asphalt distributor needs to perform spraying operations, click the switch of the hydraulic control system to start the hydraulic motors and rotate them in the forward direction. The rotation of the drive shaft 51 drives the first sub-frame 30 and the second sub-frame 40 to extend and move on the main frame 10. This movement can be controlled independently to achieve individual adjustment of the first sub-frame 30 and the second sub-frame 40 at different positions.

[0090] After the spraying work is completed, click the switch of the hydraulic system again to control the hydraulic motor to rotate in reverse, driving the first sub-frame 30 and the second sub-frame 40 to retract and move on the main frame 10, completing the recycling and folding of the first sub-frame 30 and the second sub-frame 40.

[0091] As another example of a driver, such as Figure 4 As shown, the driving component 52 is a hydraulic motor;

[0092] The output end of the hydraulic motor is connected to the end side of one of the drive shafts 51. The pair of drive shafts 51 are respectively provided with a first gear 54 and a second gear 55 that mesh with each other.

[0093] Under the action of the driving component, the first sub-frame 30 and the second sub-frame 40 move closer to each other and further apart;

[0094] Specifically, after the hydraulic motor starts, it drives one of the drive shafts 51 to rotate, and drives the other drive shaft 51 to rotate through the meshing connection of the first gear 54 and the second gear 55, thereby realizing the movement of the first sub-frame 30 and the second sub-frame 40 towards each other;

[0095] This example demonstrates how a hydraulic motor controls the linkage between the first sub-frame 30 and the second sub-frame 40. This linkage requires the corresponding sub-frames to move simultaneously, which necessitates that the main frame 10 be in the middle position during the asphalt spraying process.

[0096] Furthermore, the main frame 10 is provided with a sensor for identifying the positions of the first sub-frame 30 and the second sub-frame 40;

[0097] The sensor is connected to the controller, and the controller controls the action of the drive unit 52.

[0098] Specifically, the sensing element can be a photoelectric sensor or a limit switch. When the first sub-frame 30 and the second sub-frame 40 move to their limit positions, the controller receives the signal from the sensing element and controls the action of the drive element 52. This action refers to the forward and reverse rotation and start and stop of the drive element 52.

[0099] When this telescopic asphalt spraying beam is first used, the first sub-frame 30 and the second sub-frame 40 are retracted and folded to the longitudinal side of the main frame 10.

[0100] Adjust the positions of the first sub-frame 30 and the second sub-frame 40 relative to the main frame 10 according to the asphalt spraying width. That is, the driving component drives the first sub-frame 30 and the second sub-frame 40 to move laterally on the main frame 10 respectively to extend and unfold to match the spraying width.

[0101] When the first sub-frame 30 and the second sub-frame 40 move laterally and extend, the top rod 62 at the overlapping section of the corresponding sub-frame and the main frame 10 is contacted and limited by the limiting plate 61. The asphalt in the first cavity 31 cannot enter the interior of the second cavity 32 at the overlapping section, so that the asphalt nozzle 20 at the overlapping section does not perform spraying operation. The limiting plate 61 at the extended non-overlapping section is offset from the top rod 62. The top rod 62 moves upward under the upward elastic force or the action of the high pressure asphalt in the first cavity 31. The sealing block 64 opens the through hole 34, and the asphalt in the first cavity 31 normally enters the second cavity 32. The corresponding asphalt nozzle 20 sprays normally. Therefore, asphalt spraying of the first frame, the main frame 10 and the second frame as a whole is realized. It is suitable for roads of different widths and avoids the problem of uneven spraying caused by secondary spraying.

[0102] The foregoing description of the exemplary embodiment of the telescopic asphalt spraying beam proposed by this utility model refers to the preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of this utility model, and various combinations can be made to the various technical features and structures proposed by this utility model without exceeding the protection scope of this utility model, which is determined by the appended claims.

Claims

1. Telescopic asphalt spraying beam, including: The horizontally arranged main frame (10) is characterized in that it further includes: The first sub-frame (30) and the second sub-frame (40) are arranged horizontally and are respectively connected to the longitudinal sides of the main frame (10) through support frames (50); The support frame (50) is provided with a driving component. Under the action of the driving component, the first sub-frame (30) and the second sub-frame (40) move laterally on the main frame (10) so that they can be offset from the main frame (10) respectively. Among them, the main frame (10), the first sub-frame (30) and the second sub-frame (40) are each provided with multiple asphalt nozzles (20) arranged at intervals along their length; The main frame (10), the first sub-frame (30), and the second sub-frame (40) are all equipped with cavities that provide asphalt to the asphalt nozzle (20).

2. The telescopic asphalt spraying beam according to claim 1, characterized in that, The first sub-frame (30) and the second sub-frame (40) have the same cavity structure, each having a first cavity (31) and multiple second cavities (32); Multiple second cavities (32) are laterally spaced and connected to corresponding asphalt nozzles (20), and are all connected to the first cavity (31) through through holes (34). The first cavity (31) has a connector (33) on its end side and is connected to the asphalt tank through a connecting pipe. Among them, the through hole (34) is provided with an opening and closing component. When the first sub-frame (30) and the second sub-frame (40) overlap with the main frame (10) in the horizontal direction, the through hole (34) at the overlapping section is closed by the opening and closing component.

3. The telescopic asphalt spraying beam according to claim 2, characterized in that, The opening and closing element is a push rod (62) that slides up and down within the second cavity (32); The push rod (62) is subjected to an upward elastic force, and its upper part extends to the outside, while its lower end is a sealing block (64); The main frame (10) is provided with a limiting plate (61) arranged along its length and located above the top rod (62); When the limiting plate (61) contacts the push rod (62), the sealing block (64) at the lower end of the push rod (62) can seal the through hole (34). When the limiting plate (61) and the push rod (62) are misaligned, the sealing block (64) at the lower end of the push rod (62) can open the through hole (34).

4. The telescopic asphalt spraying beam according to claim 3, characterized in that, The top rod (62) is fitted with an elastic element (63) on its upper part. One end of the elastic element (63) contacts the first sub-frame (30) or the second sub-frame (40), and the other end contacts the shoulder of the top rod (62). The push rod (62) inside the second cavity (32) is provided with a limiting block (65) to limit the upward movement of the push rod (62); The top end of the top rod (62) is a cylindrical head or has rollers, and one end of the limiting plate (61) at the overlapping section is an upward arc structure.

5. The telescopic asphalt spraying beam according to claim 3, characterized in that, The through hole (34) is an inverted frustum structure, the sealing block (64) is an elastic body, and the lower part is a column structure that matches the frustum and the upper part is a column with an outer diameter larger than the frustum.

6. The telescopic asphalt spraying beam according to any one of claims 1 to 5, characterized in that, The drive component has a drive element (52) and a pair of transversely arranged drive shafts (51) rotatably mounted on corresponding support frames (50); The first sub-frame (30) and the second sub-frame (40) are each provided with a lug (53) that is threadedly connected to the corresponding drive shaft (51); The drive unit (52) drives a pair of drive shafts (51) to rotate.

7. The telescopic asphalt spraying beam according to claim 6, characterized in that, The drive unit (52) is a pair of hydraulic motors; Each hydraulic motor is fixedly connected to the support frame (50) and its output end is connected to the drive shaft (51); a pair of hydraulic motors are respectively connected to the controller, and the controller controls the action of the drive unit (52).

8. The telescopic asphalt spraying beam according to claim 6, characterized in that, The drive component (52) is a hydraulic motor; The output end of the hydraulic motor is connected to the end side of one of the drive shafts (51). The pair of drive shafts (51) are respectively provided with a first gear (54) and a second gear (55) that mesh with each other. Under the action of the driving component, the first sub-frame (30) and the second sub-frame (40) move closer to each other and further away from each other.

9. The telescopic asphalt spraying beam according to claim 6, characterized in that, The main frame (10) is provided with a sensor to identify the positions of the first sub-frame (30) and the second sub-frame (40); The sensor is connected to the controller, and the controller controls the action of the drive (52).

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