An asphalt spraying vehicle precision spraying device

Abstract

This utility model relates to the field of road construction technology, and in particular to a precision spraying device for an asphalt distributor. Its technical solution includes a vehicle mounting frame, a mounting pipe, a mounting plate, a nozzle, a valve core, and a hydraulic rod. A connecting pipe is installed inside the vehicle mounting frame, and a nozzle is installed at the lower end of the mounting pipe. A valve seat is installed inside the nozzle, and a valve core is installed inside the valve seat. A valve spring is installed at the upper end of the valve core, and a support ring is installed at the upper end of the valve spring. A grooved rod is installed at the upper end of the connecting rod. A rotating shaft is rotatably mounted inside the nozzle, and a protrusion and a gear are sleeved on the outer wall of the rotating shaft. A hydraulic rod is installed below the mounting pipe. This utility model solves the problem that traditional valve cores, driven by manual or mechanical linkages, cannot directly adjust the nozzle, have slow response speeds, and cannot meet the rapid flow adjustment requirements in dynamic construction by using a valve assembly driven by a hydraulic rod inside the nozzle.

Description

Technical Field

[0001] This utility model relates to the field of road construction technology, and in particular to a precision spraying device for an asphalt distributor truck. Background Technology

[0002] An asphalt distributor truck is a tank-type special-purpose vehicle equipped with an insulated container, asphalt pump, heater, and spraying system for spraying asphalt. The spraying system is the core component of the asphalt distributor truck, mainly consisting of a spray frame, nozzles, asphalt pump, filter, valves, and spraying pipelines. The nozzles are responsible for evenly spraying asphalt onto the road surface. Their structure typically includes components such as a valve body, valve core, and nozzle. By adjusting the position of the valve core, the flow rate of the nozzle can be changed, thereby achieving precise control of the spraying volume.

[0003] As a core piece of equipment in road construction, the precision of the asphalt spraying system of the asphalt distributor truck directly affects the uniformity of the asphalt layer and the construction quality. Although existing spraying systems adjust the nozzle flow rate through the valve core position, traditional valve cores are driven manually or by mechanical linkages, which cannot directly adjust the nozzles. The response speed is slow and cannot meet the needs of rapid flow rate adjustment in dynamic construction. Therefore, we propose a precision spraying device for asphalt distributor trucks to solve the existing problems. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a precision spraying device for asphalt distributors.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a precision spraying device for an asphalt distributor truck, comprising a vehicle mounting frame, a mounting pipe, a mounting plate, nozzles, a valve core, and a hydraulic rod. The mounting pipe has a mounting plate at its upper end, and the vehicle mounting frame is positioned above the mounting pipe. A connecting pipe is installed inside the vehicle mounting frame. A connecting pipe that mates with a flange on the connecting pipe is installed at the upper end of the mounting pipe. Equally spaced nozzles are installed at the lower end of the mounting pipe. A valve seat is installed inside each nozzle. The nozzle has a conical valve core with a valve spring at its upper end. The valve spring has a support ring at its upper end that connects to the inner wall of the nozzle. The valve core has a connecting rod at its upper end, and the connecting rod has a grooved rod at its upper end. A rotating shaft is rotatably mounted inside the nozzle. The outer wall of the rotating shaft is fitted with equidistantly distributed protrusions located inside the grooved rod, with the outer wall thickness gradually increasing from top to bottom. A gear is fitted onto the outer wall of the rotating shaft. A hydraulic rod is located below the mounting tube, and the telescopic end of the hydraulic rod has a toothed plate that meshes with the gear.

[0006] Preferably, a bracket is provided on the outer wall of the mounting tube, and one end of the hydraulic rod is connected to the bracket. The bracket structure forms a rigid connection between the hydraulic rod and the mounting tube.

[0007] Preferably, the bracket has a guide rail inside, and the lower end of the toothed plate has a slider that is slidably mounted inside the guide rail. The sliding mounting of the guide rail and the slider, along with the sliding guide mechanism, constrains the movement trajectory of the toothed plate.

[0008] Preferably, the lower end of the mounting tube is provided with symmetrically distributed bearing seats, and both ends of the rotating shaft are rotatably inserted into the bearing seats. The double bearing seats support both ends of the rotating shaft, forming a positioning constraint.

[0009] Preferably, the opening at the lower end of the nozzle's inner wall is funnel-shaped, and the valve seat is annular with a rubber ring embedded in its inner wall that fits against the outer wall of the valve core. The funnel-shaped flow guiding structure causes the asphalt to flow laminarly around the valve core, which, together with the rubber ring, enhances the seal between the valve core and the valve seat.

[0010] Preferably, a corrugated pipe is provided at the center end of the connecting pipe. The central corrugated pipe is designed to compensate for the axial displacement of the pipeline caused by vehicle vibration.

[0011] Preferably, an oil cylinder and a stopper rod are equidistantly distributed and slidably inserted between the mounting plate and the vehicle body mounting frame. The stopper rod and the oil cylinder are slidably installed through a sealing ring. An installation groove is formed inside the upper end of the stopper rod, and a spring is installed between the inner wall of the lower end of the installation groove and the inner wall of the oil cylinder. The hydraulic buffer system composed of the oil cylinder and the stopper rod can absorb the impact load when the spray frame is folded and unfolded.

[0012] Preferably, a piston is slidably mounted inside the oil cylinder and sleeved on the outer wall of the piston rod. The oil cylinder contains hydraulic oil, and its inner wall has an annular array of oil grooves that communicate with the interior of the cylinder. These annular oil grooves form a multi-path return channel for the hydraulic oil, complementing the piston's bidirectional damping characteristics.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. In the process of use, this utility model sprays asphalt onto the ground through the nozzle. When the flow rate is adjusted, the hydraulic rod drives the toothed plate to push the gear, which in turn drives the rotating shaft to rotate. This causes the protrusion to squeeze the inner wall of the grooved rod. The change in the thickness of the outer wall of the protrusion exerts different degrees of compression on the grooved rod, which in turn lifts the valve core, which is elastically supported by the valve spring, thereby adjusting the opening of the nozzle. This achieves the adjustment of the nozzle output flow rate. The valve core assembly can respond quickly and effectively meet the needs of rapid flow rate adjustment in dynamic construction. Attached Figure Description

[0015] Figure 1 This is a front-view three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a bottom-view three-dimensional structural diagram of the present invention;

[0017] Figure 3 This is a side sectional three-dimensional structural diagram of the oil cylinder of this utility model;

[0018] Figure 4 This is a side-view perspective three-dimensional structural diagram of the nozzle of this utility model;

[0019] Figure 5 This is a side sectional three-dimensional structural diagram of the nozzle of this utility model.

[0020] Reference numerals: 1. Vehicle body mounting bracket; 2. Oil cylinder; 3. Mounting pipe; 4. Connecting pipe; 5. Mounting plate; 6. Nozzle; 7. Bellows; 8. Connecting pipe; 9. Oil tank; 10. Piston; 11. Mounting groove; 12. Sealing ring; 13. Plug rod; 14. Spring; 15. Valve core; 16. Rotating shaft; 17. Bearing seat; 18. Guide rail; 19. Bracket; 20. Hydraulic rod; 21. Gear plate; 22. Gear; 23. Slider; 24. Groove rod; 25. Protrusion; 26. Support ring; 27. Connecting rod; 28. Valve spring; 29. ​​Valve seat. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1-5 As shown, this utility model proposes a precision spraying device for an asphalt distributor truck, including a vehicle mounting frame 1, a mounting pipe 3, a mounting plate 5, nozzles 6, valve cores 15, and a hydraulic rod 20. The mounting plate 5 is installed at the upper end of the mounting pipe 3, and the vehicle mounting frame 1 is installed above the mounting pipe 3. A connecting pipe 8 is installed inside the vehicle mounting frame 1. A connecting pipe 4 that mates with the flange of the connecting pipe 8 is installed at the upper end of the mounting pipe 3. Equally spaced nozzles 6 are installed at the lower end of the mounting pipe 3. A valve seat 29 is installed inside the nozzle 6, and a conical valve core 15 is installed inside the valve seat 29. A valve spring 28 is provided at the upper end of the core 15. A support ring 26 connected to the inner wall of the nozzle 6 is provided at the upper end of the valve spring 28. A connecting rod 27 is provided at the upper end of the valve core 15. A grooved rod 24 is provided at the upper end of the connecting rod 27. A rotating shaft 16 is rotatably installed inside the nozzle 6. The outer wall of the rotating shaft 16 is sleeved with equidistantly distributed protrusions 25 located inside the grooved rod 24 and whose outer wall thickness gradually increases from top to bottom. A gear 22 is sleeved on the outer wall of the rotating shaft 16. A hydraulic rod 20 is provided below the mounting tube 3. A toothed plate 21 that meshes with the gear 22 is provided at the telescopic end of the hydraulic rod 20.

[0023] A bracket 19 is provided on the outer wall of the mounting pipe 3, and one end of the hydraulic rod 20 is connected to the bracket 19;

[0024] The bracket 19 is provided with a guide rail 18 inside, and the lower end of the toothed plate 21 is provided with a slider 23 that is slidably installed inside the guide rail 18.

[0025] Based on the implementation steps of Embodiment 1: When this device is working, the vehicle mounting frame 1 is connected to the asphalt pumping system through the connecting pipe 4. After the asphalt enters the mounting pipe 3 through the connecting pipe 8, it is conveyed downwards along multiple nozzles 6. In the initial state, the hydraulic rod 20 is in the retracted position, which drives the toothed plate 21 to move and drives the gear 22 to rotate counterclockwise. This causes the thick end of the protrusion 25 on the rotating shaft 16 to press against the grooved rod 24, pushing the connecting rod 27 to overcome the elastic force of the valve spring 28 and lift the valve core 15. At this time, an annular flow gap is formed between the valve core 15 and the valve seat 29, and the asphalt is sprayed in a fan shape through the nozzles 6. When it is necessary to adjust the spray volume, the hydraulic control system drives the extension end of the hydraulic rod 20 to move. The hydraulic rod 20 extends and pushes the toothed plate 21 to move. The precise fit between the guide rail 18 and the slider 23 ensures that the deviation of the movement trajectory of the toothed plate 21 does not exceed 0.15mm. The clockwise rotation of the gear 22 causes the thin part of the protrusion 25 to enter the grooved rod 24. The valve core 15 moves down under the action of the valve spring 28, reducing the gap between the valve core 15 and the valve seat 29, increasing the flow cross-sectional area. The hydraulic rod 20 retracts, driving the toothed plate 21 to move. The thick part of the protrusion 25 presses against the grooved rod 24 to lift the valve core 15, reducing the flow cross-sectional area. The gradient change in the thickness of the outer wall of the protrusion 25 makes the displacement of the valve core 15 non-linearly related to the stroke of the hydraulic rod 20. It has higher adjustment sensitivity in the middle section of the full stroke of the hydraulic rod 20, enabling a rapid response during asphalt spraying and improving the accuracy of the asphalt spraying flow rate.

[0026] like Figures 1-5 As shown, compared with Embodiment 1, the precision spraying device for asphalt distributor truck proposed in this utility model further includes: a symmetrically distributed bearing seat 17 at the lower end of the mounting pipe 3, and both ends of the rotating shaft 16 are rotatably inserted into the bearing seat 17.

[0027] The nozzle 6 has a funnel-shaped opening at the lower end of the inner wall, and the valve seat 29 is annular with a rubber ring embedded in its inner wall that fits against the outer wall of the valve core 15.

[0028] A corrugated pipe 7 is installed at the center end of the internal part of the connector 4;

[0029] Between the mounting plate 5 and the vehicle body mounting bracket 1, there are equidistantly distributed and slidably inserted oil cylinders 2 and plug rods 13. The plug rods 13 and the oil cylinders 2 are slidably installed through a sealing ring 12. An installation groove 11 is opened inside the upper end of the plug rods 13, and a spring 14 is provided between the lower inner wall of the installation groove 11 and the inner wall of the oil cylinders 2.

[0030] A piston 10 is sleeved on the outer wall of the piston rod 13 and slidably installed inside the oil cylinder 2. Hydraulic oil is provided inside the oil cylinder 2, and oil grooves 9 are arranged in a ring array and communicate with the inside of the oil cylinder 2 on the inner wall of the oil cylinder 2.

[0031] In this embodiment, during the spraying process, the vehicle body vibration is transmitted to the oil cylinder 2 through the mounting plate 5. The piston 10 compresses the hydraulic oil to generate damping, while the spring 14 absorbs high-frequency micro-amplitude vibrations. When encountering severe impact, the hydraulic oil flows back through the annular oil groove 9 in multiple channels to avoid vacuum lock-up in the oil cylinder 2. The bellows 7 synchronously compensates for the relative displacement between the mounting pipe 3 and the vehicle body mounting frame 1, ensuring reliable sealing at the flange connection. The specially designed funnel-shaped nozzle 6 outlet causes the asphalt to form a centripetal converging flow below the valve core 15. With the elastic seal of the rubber ring, even if there is an assembly error of ±0.2mm in the valve core 15, the sealing surface can still maintain complete contact. The bearing seat 17 effectively suppresses the torsional vibration of the transmission system by supporting the double ends of the rotating shaft 16. This mechanical linkage system can achieve synchronous and precise control of the flow of multiple nozzles 6 through a single hydraulic actuator. It has better explosion-proof and moisture-proof characteristics than the electronic control system, and is particularly suitable for harsh working environments with high temperature and high dust of asphalt.

[0032] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A precision spraying device for an asphalt distributor truck, comprising a vehicle mounting frame (1), a mounting pipe (3), a mounting plate (5), a nozzle (6), a valve core (15), and a hydraulic rod (20), characterized in that: The mounting pipe (3) is provided with a mounting plate (5) at its upper end. A vehicle body mounting bracket (1) is provided above the mounting pipe (3). A connecting pipe (8) is provided inside the vehicle body mounting bracket (1). A butt pipe (4) is provided at the upper end of the mounting pipe (3) to connect with the flange of the connecting pipe (8). A nozzle (6) is provided at the lower end of the mounting pipe (3). A valve seat (29) is provided inside the nozzle (6). A conical valve core (15) is provided inside the valve seat (29). A valve spring (28) is provided at the upper end of the valve core (15). A valve spring (28) is provided at the upper end of the valve spring (28) to connect with the nozzle (6). The valve core (15) is connected to the inner wall of the support ring (26). The upper end of the valve core (15) is provided with a connecting rod (27). The upper end of the connecting rod (27) is provided with a grooved rod (24). The nozzle (6) is rotatably installed with a rotating shaft (16). The outer wall of the rotating shaft (16) is sleeved with equidistantly distributed protrusions (25) located inside the grooved rod (24) and whose outer wall thickness gradually increases from top to bottom. The outer wall of the rotating shaft (16) is sleeved with a gear (22). The mounting tube (3) is provided with a hydraulic rod (20) below it. The telescopic end of the hydraulic rod (20) is provided with a toothed plate (21) that meshes with the gear (22).

2. The precision spraying device for an asphalt distributor truck according to claim 1, characterized in that: The outer wall of the mounting tube (3) is provided with a bracket (19), and one end of the hydraulic rod (20) is connected to the bracket (19).

3. The precision spraying device for an asphalt distributor truck according to claim 2, characterized in that: The bracket (19) is provided with a guide rail (18) inside, and the lower end of the toothed plate (21) is provided with a slider (23) that is slidably installed inside the guide rail (18).

4. The precision spraying device for an asphalt distributor truck according to claim 1, characterized in that: The lower end of the mounting tube (3) is provided with symmetrically distributed bearing seats (17), and both ends of the rotating shaft (16) are rotatably inserted into the bearing seats (17).

5. The precision spraying device for an asphalt distributor truck according to claim 1, characterized in that: The nozzle (6) has a funnel-shaped opening at the lower end of its inner wall, and the valve seat (29) is annular with a rubber ring embedded in its inner wall that fits against the outer wall of the valve core (15).

6. The precision spraying device for an asphalt distributor truck according to claim 1, characterized in that: The corrugated pipe (7) is provided at the center end of the connecting pipe (4).

7. The precision spraying device for an asphalt distributor truck according to claim 1, characterized in that: The mounting plate (5) and the vehicle body mounting bracket (1) are provided with oil cylinders (2) and plug rods (13) that are equidistantly distributed and slidably inserted. The plug rods (13) and the oil cylinders (2) are slidably installed through a sealing ring (12). An installation groove (11) is provided inside the upper end of the plug rods (13). A spring (14) is provided between the inner wall of the lower end of the installation groove (11) and the inner wall of the oil cylinders (2).

8. The precision spraying device for an asphalt distributor truck according to claim 7, characterized in that: The piston (10) is sleeved on the outer wall of the piston rod (13) and is slidably installed inside the oil cylinder (2). The oil cylinder (2) is filled with hydraulic oil. The inner wall of the oil cylinder (2) has oil grooves (9) arranged in a ring array and communicating with the inside of the oil cylinder (2).

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