Large-scale road surface milling machine capable of realizing heat dissipation of milling cutter through water circulation

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a large-scale pavement milling machine capable of radiating heat by a milling cutter through water circulation, which comprises a milling machine main body, a milling bin is arranged at the bottom end of the milling machine main body, two milling drums are rotatably connected in the milling bin, and a cooling water tank is fixed on the right side of the milling machine main body; the cooling water tank is provided with a water outlet pipe, a water inlet pipe and a plurality of flow dividing pipes, and a circulating pipe is arranged between every two flow dividing pipes. According to the milling machine, the two milling drums are arranged in the milling bin, so that the two milling drums can fully mill a road surface, the efficiency of milling the road surface by the milling machine main body is improved, a cooling liquid can conveniently flow into a circulating pipe through a flow dividing pipe through a water outlet pipe in a cooling water tank, and the cooling efficiency is improved. The circulating pipe absorbs and exchanges heat in the milling drum through the heat exchange pieces, cooling and heat dissipation of the milling drum are completed, the temperature of a cutter on the surface of the milling drum can be kept at a proper temperature, and the service life of the cutter on the surface of the milling drum is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to a large road milling machine with water-circulating milling cutter for heat dissipation. Background Technology

[0002] Road milling machines are one of the main types of machinery used in asphalt pavement maintenance and construction. They are also one of the main pieces of equipment used in the maintenance and construction of asphalt concrete pavements. They are mainly used for the excavation and renovation of asphalt concrete pavements in highways, urban roads, airports, freight yards, etc. Milling the damaged old pavement with a road milling machine and then laying a new pavement is the most economical and modern method of asphalt pavement maintenance. Because road milling machines have high working efficiency, simple construction process, easy control of milling depth, convenient and flexible operation, and good maneuverability, and the milling waste can be directly recycled, they are widely used in urban municipal roads and highway maintenance projects.

[0003] Regarding the above and existing related technologies, the inventors believe that the following defects often exist: When the milling drum at the bottom of the milling machine is milling the road surface, the milling cutter is in continuous contact with the road surface, which will cause the temperature of the milling cutter end face to rise, thereby causing the temperature of the milling drum itself to rise. The rise in the temperature of the milling drum itself will cause metal fatigue of the milling drum and cause the tool on the surface of the milling drum to wear and break, reducing the service life of the milling drum. At the same time, the tool breakage will affect the milling efficiency of the milling drum on the road surface. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing technology has the disadvantage that the continuous contact between the milling cutter and the road surface during milling will cause the temperature of the milling drum itself to rise, resulting in metal fatigue of the milling drum and wear of the surface tools, thus reducing the service life of the milling drum. To this end, we propose a large road milling machine with water-circulating milling cutter heat dissipation.

[0005] To achieve the above objectives, this application adopts the following technical solution: a large road milling machine with water-circulating milling cutter heat dissipation, comprising a milling machine body, a milling chamber provided at the bottom end of the milling machine body, two milling drums rotatably connected inside the milling chamber, and a cooling water tank fixed on the right side of the milling machine body;

[0006] One end of the cooling water tank is provided with an outlet pipe, and the other end of the cooling water tank is provided with an inlet pipe. Multiple branch pipes are provided at the output end of the outlet pipe and the input end of the inlet pipe, and they penetrate through the milling chamber to the interior of the milling drum. The outer wall of the branch pipe is rotatably sleeved with the inner wall of the milling drum. A circulation pipe is provided between two branch pipes, and the circulation pipe is sleeved with the inner wall of the milling drum. A heat exchange fin is sleeved and fixed on the outer wall of the circulation pipe.

[0007] Preferably, a hydraulic motor is fixed to the outer wall of the milling chamber and located above the diversion pipe. A gearbox is sleeved and fixed to the output end of the hydraulic motor and the connection end of the milling drum and is located inside the milling chamber. Multiple helical blades are distributed on the inner wall of the milling drum, and the helical blades are located on the outer wall of the circulation pipe and heat exchange plate. Multiple plate heat exchangers are provided at both ends of the outer wall of the milling drum.

[0008] Preferably, the cooling water tank is internally provided with a circulating water tank and a cooling water tank, and the circulating water tank is connected to the outlet pipe, the cooling water tank is connected to the inlet pipe, and a refrigeration device is provided at the top of the cooling water tank.

[0009] Preferably, the gearbox is equipped with multiple gear sets, the outer wall of the milling drum is provided with helically distributed milling cutters, one hydraulic motor drives the milling drum to rotate clockwise, another hydraulic motor drives the milling drum to rotate counterclockwise, multiple helical blades are helically distributed on the inner wall of the milling drum, half of the internal space of the milling drum is filled with cooling oil and located between the helical blades, and the metal heat exchange rod on the surface of the plate heat exchanger penetrates into the interior of the milling drum and contacts the cooling oil.

[0010] Preferably, there are two diversion pipes, which are located on both sides of the outlet end of the water pipe and the inlet end of the water pipe, respectively, and the paths of the two diversion pipes are consistent. The diameter of the diversion pipe is larger than the diameter of the circulation pipe. The cooling water tank is filled with coolant, and the outer wall of the heat exchange plate is in contact with the cooling oil inside the spiral blade.

[0011] Preferably, a water pump is installed at the connection between the circulating water tank and the outlet pipe, and at the connection between the cooling water tank and the inlet pipe. A connecting pipe is installed between the circulating water tank and the cooling water tank, and a control valve is installed inside the connecting pipe.

[0012] The technical effects and advantages of this utility model are as follows:

[0013] In this invention, two milling drums are installed inside the milling chamber, which facilitates the two milling drums to fully mill the road surface, improving the efficiency of the milling machine body in milling the road surface. Through the water outlet pipe in the cooling water tank, the coolant flows into the circulation pipe through the diversion pipe, and the circulation pipe absorbs and exchanges heat from the milling drum through the heat exchange fins, completing the cooling and heat dissipation of the milling drum. This keeps the temperature of the cutting tools on the surface of the milling drum at a suitable temperature, improving the service life of the cutting tools on the surface of the milling drum. Attached Figure Description

[0014] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts:

[0015] Figure 1 This is a schematic diagram of the overall structure of the milling machine body of this utility model;

[0016] Figure 2 This is a cross-sectional structural diagram of the milling chamber of this utility model;

[0017] Figure 3 This is a schematic cross-sectional view of the milling drum of this utility model;

[0018] Figure 4 This is a schematic diagram of the connection structure between the circulation pipe and the diversion pipe of this utility model;

[0019] Figure 5 This is a cross-sectional structural diagram of the cooling water tank of this utility model.

[0020] Legend: 1. Milling machine body; 2. Milling chamber; 3. Milling drum; 301. Spiral blade; 302. Hydraulic motor; 303. Gearbox; 304. Plate heat exchanger; 4. Cooling water tank; 401. Outlet pipe; 402. Diverter pipe; 403. Circulation pipe; 404. Heat exchange plate; 405. Inlet pipe; 406. Circulating water tank; 407. Cooling water tank; 408. Refrigeration equipment. Detailed Implementation

[0021] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0022] Reference Figures 1-5 As shown, this utility model provides a technical solution: a large road milling machine with water-circulating milling cutter heat dissipation, including a milling machine body 1, a milling chamber 2 is provided at the bottom of the milling machine body 1, two milling drums 3 are rotatably connected inside the milling chamber 2, and a cooling water tank 4 is fixed on the right side of the milling machine body 1.

[0023] One end of the cooling water tank 4 is provided with an outlet pipe 401, and the other end of the cooling water tank 4 is provided with an inlet pipe 405. Multiple branch pipes 402 are provided at the output end of the outlet pipe 401 and the input end of the inlet pipe 405, and they penetrate through the milling chamber 2 to the interior of the milling drum 3. The outer wall of the branch pipe 402 is rotatably sleeved with the inner wall of the milling drum 3. A circulation pipe 403 is provided between two branch pipes 402, and the circulation pipe 403 is sleeved with the inner wall of the milling drum 3. A heat exchange fin 404 is sleeved and fixed on the outer wall of the circulation pipe 403.

[0024] The milling chamber 2 is equipped with two milling drums 3, which facilitates the two milling drums 3 to fully mill the road surface, thereby improving the efficiency of the milling machine body 1 in milling the road surface. Through the water outlet pipe 401 in the cooling water tank 4, the coolant flows into the circulation pipe 403 through the diversion pipe 402. The circulation pipe 403 absorbs and exchanges heat from the milling drum 3 through the heat exchange fins 404, thereby cooling and dissipating heat from the milling drum 3. This keeps the temperature of the cutting tools on the surface of the milling drum 3 at a suitable temperature, thereby improving the service life of the cutting tools on the surface of the milling drum 3.

[0025] Reference Figure 2 and Figure 3 As shown in this embodiment: a hydraulic motor 302 is fixed to the outer wall of the milling chamber 2 and is located above the diversion pipe 402. A gearbox 303 is sleeved and fixed to the output end of the hydraulic motor 302 and the connection end of the milling drum 3 and is located inside the milling chamber 2. Multiple spiral blades 301 are distributed on the inner wall of the milling drum 3 and are located on the outer wall of the circulation pipe 403 and the heat exchange plate 404. Multiple plate heat exchangers 304 are provided at both ends of the outer wall of the milling drum 3. The spiral blades 301 on the inner wall of the milling drum 3 facilitate the rotation of the milling drum 3 by the hydraulic motor 302. When the milling drum 3 rotates, the cooling oil inside the milling drum 3 is turned over by the spiral blades 301, so that the cooling oil comes into contact with the inner wall of the milling drum 3 and completes the absorption and heat exchange of the milling cutter on the outer wall of the milling drum 3. At the same time, the cooling oil can dissipate the absorbed heat into the air through the plate heat exchanger 304 by contacting the plate heat exchanger 304.

[0026] Reference Figures 3-5 As shown in this embodiment: the cooling water tank 4 is internally equipped with a circulating water tank 406 and a cooling water tank 407. The circulating water tank 406 is connected to the outlet pipe 401, and the cooling water tank 407 is connected to the inlet pipe 405. A refrigeration device 408 is installed at the top of the cooling water tank 407. By having a circulating water tank 406 and a cooling water tank 407 internally, the coolant after heat exchange can flow into the cooling water tank 407 through the inlet pipe 405. The coolant after heat exchange is cooled in the cooling water tank 407 and then flows into the circulating water tank 406. This stabilizes the temperature of the coolant inside the circulating water tank 406 and improves the cooling effect of the coolant.

[0027] Reference Figure 2 and Figure 3As shown in this embodiment: The gearbox 303 contains multiple gear sets; the outer wall of the milling drum 3 is equipped with helically distributed milling cutters; one hydraulic motor 302 drives the milling drum 3 to rotate clockwise, and another hydraulic motor 302 drives the milling drum 3 to rotate counterclockwise; multiple helical blades 301 are helically distributed on the inner wall of the milling drum 3; half of the internal space of the milling drum 3 is filled with cooling oil, located between the helical blades 301; the metal heat exchange rods on the surface of the plate heat exchanger 304 penetrate into the interior of the milling drum 3 and contact the cooling oil; the cooling oil is distributed through the inner wall of the milling drum 3 and located between the helical blades 301. The rotation of the spiral blades 301 facilitates the contact between the cooling oil inside the milling drum 3 and the inner wall of the milling drum 3 under the action of tumbling. This allows the cooling oil to exchange heat with the cutting tools on the surface of the milling drum 3 and cool them down. At the same time, the cooling oil contacts the outer wall of the circulation pipe 403 under the action of tumbling, which facilitates the circulation pipe 403 to absorb heat and cool down the cooling oil. This allows the cooling oil to continuously absorb and cool the surface temperature of the milling cutter inside the milling drum 3. Since the two milling drums 3 rotate in opposite directions, when the milling drum 3 is milling and breaking the road surface, the waste material from the road surface milling and breaking is collected inside the milling chamber 2 and can be discharged through the conveying pipe of the milling machine body 1.

[0028] Reference Figures 2-5 As shown in this embodiment: there are two diversion pipes 402, located on both sides of the outlet end of the water outlet pipe 401 and the inlet end of the water inlet pipe 405, respectively, and the paths of the two diversion pipes 402 are consistent. The diameter of the diversion pipe 402 is larger than the diameter of the circulation pipe 403. The cooling water tank 4 is filled with coolant, and the outer wall of the heat exchange fins 404 is in contact with the cooling oil inside the spiral blades 301. The cooling water tank 4 is filled with coolant, and the outer wall of the heat exchange fins 404 is in contact with the cooling oil inside the spiral blades 301. The cooling water tank 402 is filled with coolant, and the milling drum 3 is filled with cooling oil. The coolant has a strong heat absorption capacity and high heat dissipation efficiency. This facilitates the rapid flow of coolant through the heat exchange fins 404 to absorb heat from the cooling oil, thereby lowering the oil temperature. The two branch pipes 402 follow the same path, ensuring that the coolant flowing inside the outlet pipe 401 flows into the two milling drums 3 at the same speed and flow rate. Simultaneously, as the coolant flows from the larger diameter pipe into the smaller diameter pipe, the flow rate and pressure of the coolant change, causing the coolant to flow faster inside the circulation pipe 403. This facilitates rapid heat exchange and cooling of the milling drums 3 by the coolant in the circulation pipe 403.

[0029] Reference Figures 3-5As shown in this embodiment: water pumps are installed at the connection between the circulating water tank 406 and the outlet pipe 401, and at the connection between the cooling water tank 407 and the inlet pipe 405. A connecting pipe is installed between the circulating water tank 406 and the cooling water tank 407, and a control valve is installed inside the connecting pipe. Through the connecting pipe between the circulating water tank 406 and the cooling water tank 407, and the control valve inside the connecting pipe, the coolant in the cooling water tank 407 can flow into the circulating water tank 406 through the connecting pipe after the temperature drops.

[0030] Working principle: The user drives the milling machine body 1 and starts the hydraulic motor 302, which drives the milling drum 3 to rotate inside the milling chamber 2 through the gearbox 303. The rotation of the milling drum 3 can mill the road surface. The rotation of the milling drum 3 drives the spiral blades 301 to rotate. The rotation of the spiral blades 301 causes the cooling oil inside the milling drum 3 to tumble and come into contact with the inner wall of the milling drum 3, cooling the cutters on the outer wall of the milling drum 3. At the same time, the tumbling of the cooling oil can make the heat absorbed by the cooling oil evenly mixed, avoiding localized overheating of the cooling oil. During the tumbling process, the cooling oil comes into contact with the metal rod of the plate heat exchanger 304, which facilitates the initial heat dissipation and cooling of the cooling oil through the plate heat exchanger 304, avoiding the risk of breakage of the cutters on the surface of the milling drum 3 after prolonged high-temperature milling. The two milling drums 3 rotate in opposite directions, which makes it easy for the waste material from the milling and crushing of the road surface to accumulate inside the milling chamber 2, and then be discharged through the conveying pipe of the milling machine body 1.

[0031] A water pump draws coolant from the circulating water tank 406 into the outlet pipe 401, allowing it to flow into the branch pipe 402 and then into the circulation pipe 403. The increased flow rate of the coolant in the circulation pipe 403 facilitates rapid heat exchange and cooling of the milling drum 3. Simultaneously, the rotating helical blades 301 cause the cooling oil to tumble and flow within the milling drum 3, ensuring full contact between the heat exchange fins 404 on the outer wall of the circulation pipe 403 and the tumbling cooling oil. This facilitates heat exchange and cooling of the cooling oil, maintaining a suitable temperature inside the milling drum 3. Within a reasonable range, the heat inside the milling drum 3 can be dissipated quickly, thus keeping the temperature of the cutting tool within a reasonable range. At the same time, the coolant in the circulation pipe 403 flows, and after completing the heat exchange and cooling of the cooling oil inside the milling drum 3, it flows into the cooling water tank 407 through the water inlet pipe 405. The cooling device 408 at the top of the cooling water tank 407 cools the coolant inside the cooling water tank 407, and then the coolant is transported to the circulation water tank 406. This keeps the coolant transported by the circulation water tank 406 at a low temperature for a long time, improving the heat exchange efficiency of the coolant during circulation and facilitating rapid cooling and heat dissipation of the cutting tool on the outer wall of the milling drum 3.

[0032] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A large road milling machine with water-circulating milling cutter cooling, characterized in that, The milling machine includes a main body, a milling chamber at the bottom of the main body, two milling drums rotatably connected inside the milling chamber, and a cooling water tank fixed on the right side of the main body. One end of the cooling water tank is provided with an outlet pipe, and the other end of the cooling water tank is provided with an inlet pipe. Multiple branch pipes are provided at the output end of the outlet pipe and the input end of the inlet pipe, and they penetrate through the milling chamber to the interior of the milling drum. The outer wall of the branch pipe is rotatably sleeved with the inner wall of the milling drum. A circulation pipe is provided between two branch pipes, and the circulation pipe is sleeved with the inner wall of the milling drum. A heat exchange fin is sleeved and fixed on the outer wall of the circulation pipe.

2. The large road milling machine with water-circulating milling cutter heat dissipation according to claim 1, characterized in that: A hydraulic motor is fixed to the outer wall of the milling chamber and is located above the diversion pipe. A gearbox is sleeved and fixed to the output end of the hydraulic motor and the connection end of the milling drum and is located inside the milling chamber. Multiple helical blades are distributed on the inner wall of the milling drum and are located on the outer wall of the circulation pipe and heat exchange plate. Multiple plate heat exchangers are provided at both ends of the outer wall of the milling drum.

3. The large road milling machine with water-circulating milling cutter heat dissipation according to claim 1, characterized in that: The cooling water tank is equipped with a circulating water tank and a cooling water tank. The circulating water tank is connected to the outlet pipe, and the cooling water tank is connected to the inlet pipe. A refrigeration device is installed at the top of the cooling water tank.

4. The large road milling machine with water-circulating milling cutter heat dissipation according to claim 2, characterized in that: The gearbox contains multiple gear sets, and the outer wall of the milling drum is equipped with helically distributed milling cutters. One hydraulic motor drives the milling drum to rotate clockwise, and another hydraulic motor drives the milling drum to rotate counterclockwise. Multiple helical blades are helically distributed on the inner wall of the milling drum. Half of the internal space of the milling drum is filled with cooling oil, which is located between the helical blades. The metal heat exchange rod on the surface of the plate heat exchanger penetrates into the interior of the milling drum and comes into contact with the cooling oil.

5. The large road milling machine with water-circulating milling cutter heat dissipation according to claim 3, characterized in that: There are two diversion pipes, which are located on both sides of the outlet end of the water pipe and the inlet end of the water pipe, respectively, and the paths of the two diversion pipes are the same. The diameter of the diversion pipe is larger than the diameter of the circulation pipe. The cooling water tank is filled with coolant, and the outer wall of the heat exchange plate is in contact with the cooling oil inside the spiral blade.

6. The large road milling machine with water-circulating milling cutter heat dissipation according to claim 3, characterized in that: Water pumps are installed at the connection between the circulating water tank and the outlet pipe, and at the connection between the cooling water tank and the inlet pipe. A connecting pipe is installed between the circulating water tank and the cooling water tank, and a control valve is installed inside the connecting pipe.

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