A molten material pumping system for a road marking machine

Abstract

The application discloses a molten material pumping system for a road marking machine, which comprises a plurality of inlets connected with the bottom outlet of a hot melting kettle, and the outlet of each inlet is connected with the inlet of a mixing cavity; the mixing cavity is a double-layer structure, the upper layer is provided with a pressurizing screw rod for pressurizing, the front end of the pressurizing screw rod is provided with a gear transmission device, and the gear transmission device is located on the top of the lower-layer inlet; the bottom of the mixing cavity is connected with a longitudinal material conveying part, the longitudinal material conveying part comprises a longitudinal material conveying screw rod, and the top of the longitudinal material conveying part is provided with an outlet. The device is a fast molten material pumping system designed for the road marking machine, which is characterized by high temperature, high viscosity and no bubbles of the molten material for the road marking machine, and the cooperation between the pipe diameter and the conveying screw rods improves the conveying efficiency, reduces the heat consumption of the molten material, and meets the normal use of the road marking machine.

Description

Technical Field

[0001] This invention relates to a molten material pumping system for a road marking machine. Background Technology

[0002] In order to regulate the driving of vehicles on the road in a more orderly manner, directional lines need to be drawn on the surface of various roads. The drawing of road directional lines often requires melting the relevant materials on site and applying the materials to the road surface quickly while maintaining high temperature.

[0003] In order to meet the requirements of rapid industrialization and environmental protection, the small-scale line marking machines of the past have been gradually phased out, while large-scale and centralized line marking machines have begun to be widely used in various road marking projects.

[0004] For marking machines, the main component for melting materials is the hot melt kettle. Traditional processes often use earthen furnaces for heating, but due to safety requirements, this is gradually being replaced by centralized large hot melt kettles. Large hot melt kettles adopt a centralized processing method, feeding from the top, melting in the middle, and discharging from the bottom, providing the marking machine with a stable and large quantity of molten material. However, the existing discharge method still uses a slow flow, which has extremely poor conveying capacity. Moreover, during the slow flow of material, the material loses a lot of heat due to prolonged contact with air, which is often inconvenient for subsequent marking operations.

[0005] In light of the above, in actual use, especially in winter, on-site operators urgently need a material conveying system that can quickly pump molten materials. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the existing defects and improve the pumping capacity by using a multi-channel aggregation method, so as to provide a molten material pumping system for road marking machines.

[0007] A molten material pumping system for a road marking machine includes several inlets connected to the bottom outlet of a hot melt kettle. The outlets of the inlets are all connected to the inlet of a mixing chamber. The mixing chamber has a double-layer structure. The upper layer is equipped with a pressurizing screw, and a gear transmission device is located at the front end of the pressurizing screw. The gear transmission device is located at the top of the lower inlet. The bottom of the mixing chamber is connected to a longitudinal conveying section through a square pipe. The longitudinal conveying section includes a longitudinal conveying screw, and the top of the longitudinal conveying section is equipped with an outlet.

[0008] In order to better utilize the effect of gravity and thus pressurize and transport molten materials with high viscosity, the inlet of the mixing chamber is located in the upper layer and the outlet of the mixing chamber is located in the lower layer.

[0009] To prevent air from entering during pressurized conveying and to ensure gradual and stable pressurization, both the first and second inlets are connected to the mixing chamber via a first square pipe. The mixing chamber is connected to the longitudinal conveying section via a second square pipe, and the longitudinal conveying section is connected to the outlet via a third square pipe.

[0010] The cross-sectional areas of the first square pipe, the second square pipe, and the third square pipe gradually decrease. The outer surfaces of the first square pipe, the second square pipe, and the third square pipe are all covered with a jacket, which is filled with flowing heat transfer oil. The temperature of the heat transfer oil is the same as the internal temperature of the hot melt kettle.

[0011] To save space and better accommodate the pumping device at the rear of the vehicle, the longitudinal conveying section houses a longitudinal conveying screw. The longitudinal transmission part of this screw is located at the top and connected to the main transmission housing in the middle of the overall structure via a longitudinal transmission rod. The main transmission housing contains the main drive motor. In operation, the hot-melt kettle is installed in the middle of the engineering vehicle and connected to the pumping system at its rear. The pumping system is also installed at the rear of the engineering vehicle, allowing for convenient feeding of materials to a small marking machine. This type of small marking machine generally refers to a marking carriage without hot-melt capability, or a marking carriage with poor hot-melt capability.

[0012] Specifically, the feed inlets include a first feed inlet and a second feed inlet, which are horizontally symmetrically distributed. A first feeding screw is installed inside the first square pipe of the first feed inlet, and a second feeding screw is installed inside the second square pipe of the second feed inlet. The tops of the first and second feeding screws are mirror images of each other. A pressure screw is located at the center of both screws, with its centerline perpendicular to the centerline of the first feeding screw. This design effectively achieves multi-screw pressurization, allowing the slowly flowing molten material to undergo two pressurization processes to achieve a faster flow rate, thus meeting the requirements for rapid pumping. The two pressurization processes involve two stages: the first pressurization is achieved through the multiple input pipes, and the second pressurization is achieved through the vertical pressure screw. The flow rate after the two pressurizations is approximately 2-3 times the initial flow rate.

[0013] To prevent deflection due to pressure during screw rotation, the tail of the first feeding screw is connected to a horizontal motor via a horizontal transmission rod. A horizontal clamping device is provided in the middle of the horizontal transmission rod, and the outside of the horizontal transmission rod is connected to the machine body via a transmission bearing.

[0014] To ensure stability under long-distance conveying conditions, the longitudinal conveying screw includes an upper longitudinal conveying screw and a lower longitudinal conveying screw connected vertically.

[0015] To save space, all important power components are installed inside the overall machine body, thereby protecting important components while saving space. The longitudinal transmission rod and the longitudinal conveying screw are connected by gear transmission, and the gear is located in the longitudinal gearbox.

[0016] Important components such as the longitudinal gearbox, pressurized motor, and main drive housing are all installed inside the overall body, and are all located close to the center of the engineering vehicle body. Beneficial effects

[0017] This device is a rapid pumping system for molten materials designed for marking machines. It addresses the characteristics of molten materials used in marking machines, such as high temperature, high viscosity, and the absence of air bubbles. Through the matching of pipe diameter and various conveying screws, it improves conveying efficiency while reducing the heat consumption of molten materials, thus meeting the normal operation requirements of the marking machine.

[0018] Specifically, this device uses molten material slowly flowing out from two or more hot melt kettles. After initial pressurization and secondary pressurization, a jet with a relatively high flow rate is formed. In order to reduce heat consumption during the conveying process, the system has optimized the management design and integrated the two pressurization processes into a single mixing chamber, thereby improving the efficiency of the pumping system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the molten material pumping system;

[0020] Figure 2 This is a schematic diagram of the internal conveying structure of a molten material pumping system;

[0021] Figure 3 This is a schematic diagram of the material transmission structure at the center of the pumping system;

[0022] Figure 4 This is a schematic diagram of the transmission during the material rising stage of a pumping system;

[0023] 1. First feed inlet 2. Second feed inlet 3. Mixing chamber 4. Horizontal transmission rod 5. Horizontal motor 6. Main transmission box 7. Longitudinal conveying pipe 8. Longitudinal transmission rod 9. Longitudinal gearbox 11. First feeding screw 21. Second feeding screw 31. Pressurizing screw 32. Pressurizing motor 33. Gear transmission device 61. Upper longitudinal feeding screw 62. Lower longitudinal feeding screw. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0025] When marking road lines on medium to large-sized roads, the equipment mainly used includes:

[0026] Medium and large-sized engineering vehicles, and several lane marking vehicles.

[0027] Two hot melt kettles are installed in the middle of medium and large engineering vehicles, and the outlets of the two hot melt kettles are connected to the first inlet 1 and the second inlet 2 of the pumping system through pipelines.

[0028] Both the first inlet 1 and the second inlet 2 are connected to the mixing chamber via a first square pipe. The mixing chamber 3 is connected to the longitudinal conveying section via a second square pipe. The longitudinal conveying section is connected to the outlet via a third square pipe.

[0029] The cross-sectional areas of the first square pipe, the second square pipe, and the third square pipe gradually decrease. The outer surfaces of the first square pipe, the second square pipe, and the third square pipe are all covered with a jacket, which is filled with flowing heat transfer oil. The temperature of the heat transfer oil is the same as the internal temperature of the hot melt kettle.

[0030] The mixing chamber 3 has a double-layer structure. The upper layer is provided with a pressurizing screw 31 for pressurization. A gear transmission device 33 is provided at the front end of the pressurizing screw 31. The gear transmission device 33 is located at the top of the lower inlet. The bottom of the mixing chamber 3 is connected to the longitudinal conveying section. The longitudinal conveying section includes a longitudinal conveying screw, which includes an upper longitudinal conveying screw 61 and a lower longitudinal conveying screw 62 connected vertically.

[0031] Usage steps:

[0032] 1. Place the material to be melted into the hot melt kettle;

[0033] 2. The hot melt kettle is heated, and the material that meets the temperature and viscosity requirements is discharged from the bottom outlet into the first and second inlets of the pumping system;

[0034] 3. When there is no need to supply materials to external parties, all motors are in standby mode. When pumping is required, all motors are turned on in sequence.

[0035] 4. The two transverse motors 5 drive the first feeding screw 11 and the second feeding screw 21 to rotate through their respective transverse transmission rods 4, and extrude the material to the middle.

[0036] 5. Under the combined action of the pressure screw 31, all the materials are mixed in the middle and a large pressure is formed. At this time, under the dual action of pressure and gravity, the materials flow into the lower layer at the bottom under the drive of the gear conveyor.

[0037] 6. At this time, the longitudinal conveying section operates at high speed, transporting the material to the discharge port at an extremely fast speed and injecting it into the waiting marking machine. Compared with the traditional conveying device, this process is 2-3 times more efficient. Moreover, during the operation, the material is kept warm by heat transfer oil on the one hand and heated by the longitudinal screw on the other hand, so the temperature loss is almost zero.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A molten material pumping system for a road marking machine, characterized in that, It includes several inlets, which are connected to the bottom outlet of the hot melt kettle. The outlets of the inlets are all connected to the inlet of the mixing chamber. The mixing chamber has a double-layer structure. The upper layer is equipped with a pressure screw for pressurization. The front end of the pressure screw is equipped with a gear transmission device, which is located at the top of the lower inlet. The bottom of the mixing chamber is connected to a longitudinal conveying section through a square pipe. The longitudinal conveying section includes a longitudinal conveying screw, and the top of the longitudinal conveying section is equipped with an outlet. The feed inlet includes a first feed inlet and a second feed inlet, which are horizontally symmetrically distributed. A first feeding screw is provided inside the first square pipe corresponding to the first feed inlet, and a second feeding screw is provided inside the first square pipe corresponding to the second feed inlet. The first feeding screw and the second feeding screw are mirror images of each other. A pressure screw is provided at the center of the first feeding screw and the second feeding screw, and the center line of the pressure screw is perpendicular to the center line of the first feeding screw. The first and second inlets are both connected to the mixing chamber via a first square pipe. The mixing chamber is connected to the longitudinal conveying section via a second square pipe. The longitudinal conveying section is connected to the outlet via a third square pipe. The cross-sectional areas of the first square pipe, the second square pipe, and the third square pipe gradually decrease. The outer surfaces of the first square pipe, the second square pipe, and the third square pipe are all covered with a jacket, which is filled with flowing heat transfer oil. The temperature of the heat transfer oil is the same as the internal temperature of the hot melt kettle.

2. A molten material pumping system for a road marking machine as defined in claim 1, wherein, The inlet of the mixing chamber is located in the upper layer, and the outlet of the mixing chamber is located in the lower layer.

3. A molten material pumping system for a road marking machine as defined in claim 1, wherein, The longitudinal conveying section is equipped with a longitudinal conveying screw inside. The longitudinal transmission part of the longitudinal conveying screw is located at the top. The longitudinal transmission part is connected to the main transmission box located in the middle of the overall structure through a longitudinal transmission rod. The main transmission box is equipped with a main transmission motor inside.

4. A molten material pumping system for a road marking machine as claimed in claim 3, wherein, The tail of the first feeding screw is connected to the horizontal motor via a horizontal transmission rod. A horizontal clamping device is provided in the middle of the horizontal transmission rod, and the outside of the horizontal transmission rod is connected to the machine body via a transmission bearing.

5. A molten material pumping system for a road marking machine as defined in claim 1, wherein, The longitudinal feeding screw includes an upper longitudinal feeding screw and a lower longitudinal feeding screw connected vertically.

6. A molten material pumping system for a road marking machine according to claim 3, characterized in that, The longitudinal transmission rod and the longitudinal conveying screw are connected by gear transmission, and the gear is located in the longitudinal gearbox.

Images