A paving machine mainframe auxiliary hydraulic system and paving machine

Abstract

The utility model relates to the technical field of paver, specifically disclose a kind of paver host auxiliary hydraulic system and paver, paver host auxiliary hydraulic system includes first hydraulic pump, first priority valve, second priority valve and cold start valve, oil tank, first hydraulic pump and main oil supply oil circuit are sequentially communicated;The input end of first priority valve is communicated with main oil supply oil circuit, and the first output end and the second output end of first priority valve are communicated with first oil supply branch and the input end of second priority valve respectively, and the first output end and the second output end of second priority valve are communicated with second oil supply branch and third oil supply branch respectively, and first oil supply branch, second oil supply branch and third oil supply branch are all used to give the hydraulic oil of executing mechanism;The first input oil port and the first output oil port of cold start valve are communicated with the output end and the input end of first hydraulic pump respectively, when starting in low-temperature condition, cold start valve is communicated with the first input oil port and the first output oil port, can make engine start smoothly.

Description

Technical Field

[0001] This utility model relates to the field of paver technology, and in particular to an auxiliary hydraulic system for a paver main unit and a paver. Background Technology

[0002] A paver is a construction device mainly used for paving various materials for the base and surface layers of highways. It consists of various systems working together to complete the paving operation. Most existing fully hydraulically driven pavers use hydraulic drives, including hydraulic systems for power generation, travel, material conveying, screed extension, auger distribution, compaction, vibration, and auxiliary hydraulic systems.

[0003] In the paver's main auxiliary hydraulic system, hydraulic oil is typically supplied to a multi-way valve via a hydraulic pump. The multi-way valve then distributes the hydraulic oil to actuators such as the hopper cylinder, leveling cylinder, boom lifting cylinder, screed lifting cylinder, parking brake, and screed lifting cylinder. During low-temperature conditions (e.g., winter), the high viscosity of the hydraulic oil causes significant resistance to the hydraulic pump, easily leading to engine start-up failure. When the user fails to start the engine, they may continue to attempt to start it. In low-temperature conditions, the aftertreatment system is prone to clogging due to particulate matter caused by the difficulty in starting the engine. If the aftertreatment system becomes clogged during startup, the combustion process cannot function properly because the engine is not operating normally. The carbon deposits produced during subsequent engine restarts can cause piston ring sticking, further leading to engine cylinder scoring and ultimately damaging the engine itself.

[0004] The information disclosed above in this background section is only intended to enhance the understanding of this background section, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide an auxiliary hydraulic system for a paver and a paver, so that the engine can start smoothly under low temperature conditions and avoid engine damage.

[0006] On the one hand, this utility model provides an auxiliary hydraulic system for a paver main unit, which includes:

[0007] The first hydraulic pump is used to connect to the engine drive. The input end of the first hydraulic pump is connected to the oil tank, and the output end of the first hydraulic pump is connected to the main oil supply circuit.

[0008] The priority valve assembly includes a first priority valve and a second priority valve. The input end of the first priority valve is connected to the main oil supply circuit. The first output end of the first priority valve is connected to the first oil supply branch. The second output end of the first priority valve is connected to the input end of the second priority valve. The first output end of the second priority valve is connected to the second oil supply branch. The second output end of the second priority valve is connected to the third oil supply branch. The first oil supply branch, the second oil supply branch, and the third oil supply branch are all used to supply hydraulic oil to the actuator.

[0009] A cold start valve has a first input port and a first output port. The first input port is connected to the output end of the first hydraulic pump, and the first output port is connected to the input end of the first hydraulic pump. The cold start valve can connect or disconnect the first input port and the first output port.

[0010] As a preferred technical solution for the auxiliary hydraulic system of the paver main unit, the actuator includes a braking actuator, which includes a first control valve and a brake cylinder. The first control valve includes a second input port, a second output port, and a return port. The second input port is connected to the first oil supply branch, the second output port is connected to the rodless chamber of the brake cylinder, the return port is connected to the return oil circuit, and the return oil circuit is connected to the oil tank. The first control valve enables one of the second input port and the return port to be connected to the second output port, and enables the other of the second input port and the return port to be disconnected.

[0011] As a preferred technical solution for the auxiliary hydraulic system of the paver main unit, the actuator further includes a tensioning actuator, which includes a second control valve and a tensioning cylinder. The second control valve has an A1 port, a B1 port, a P1 port, and a T1 port. The P1 port is connected to the first oil supply branch, the A1 port is connected to the rod chamber of the tensioning cylinder, the B1 port is connected to the rodless chamber of the tensioning cylinder, and the T1 port is connected to the return oil circuit, which is connected to the oil tank. The second control valve enables one of the A1 port and the B1 port to be connected to the P1 port, and the other of the two ports to be connected to the T1 port.

[0012] As a preferred technical solution for the auxiliary hydraulic system of the paver main unit, the actuator further includes a leveling actuator, which includes a third control valve and a leveling cylinder. The third control valve has an A2 port, a B2 port, a P2 port, and a T2 port. The P2 port is connected to the second oil supply branch, the A2 port is connected to the rod chamber of the leveling cylinder, the B2 port is connected to the rodless chamber of the leveling cylinder, and the T2 port is connected to the return oil circuit, which is connected to the oil tank. The third control valve enables one of the A2 port and the B2 port to be connected to the P2 port, and the other to be connected to the T2 port. The third control valve also enables the A2 port, the B2 port, the P2 port, and the T2 port to be connected simultaneously.

[0013] As a preferred technical solution for the auxiliary hydraulic system of the paver main unit, the actuator further includes a cage lifting actuator, which includes a fourth control valve and a cage lifting cylinder. The fourth control valve has an A3 port, a B3 port, a P3 port, and a T3 port. The P3 port is connected to the third oil supply branch, the A3 port is connected to the rod chamber of the cage lifting cylinder, the B3 port is connected to the rodless chamber of the cage lifting cylinder, and the T3 port is connected to the return oil circuit, which is connected to the oil tank. The fourth control valve enables one of the A3 and B3 ports to be connected to the P3 port, and the other to be connected to the T3 port. The fourth control valve also enables the A3, B3, and T3 ports to be connected simultaneously, while the P3 port is disconnected.

[0014] As a preferred technical solution for the auxiliary hydraulic system of the paver main unit, the auger lifting actuator further includes a first hydraulically controlled check valve and a second hydraulically controlled check valve. The input end of the first hydraulically controlled check valve is connected to port A3, the output end of the first hydraulically controlled check valve is connected to the rod chamber of the auger lifting cylinder, the pilot control end of the first hydraulically controlled check valve is connected to port B3, the input end of the second hydraulically controlled check valve is connected to port B3, the output end of the second hydraulically controlled check valve is connected to the rodless chamber of the auger lifting cylinder, and the pilot control end of the second hydraulically controlled check valve is connected to port A3.

[0015] As a preferred technical solution for the auxiliary hydraulic system of the paver main unit, the actuator further includes a hopper opening and closing actuator, which includes a fifth control valve, a large hopper opening and closing cylinder, and a small hopper opening and closing cylinder. The fifth control valve has an A4 port, a B4 port, a P4 port, and a T4 port. The P4 port is connected to the third oil supply branch. The A4 port is connected to the rod chamber of the small hopper opening and closing cylinder. The B4 port is connected to both the rodless chamber of the small hopper opening and closing cylinder and the chamber of the large hopper opening and closing cylinder. The T4 port is connected to the return oil circuit, which is connected to the oil tank. The fifth control valve enables one of the A4 and B4 ports to be connected to the P4 port, and the other to be connected to the T4 port. The fifth control valve also enables the A4, B4, T4, and P4 ports to be simultaneously disconnected.

[0016] As a preferred technical solution for the auxiliary hydraulic system of the paver main unit, the actuator also includes a screed lifting actuator, which includes a sixth control valve, a seventh control valve and a screed lifting cylinder;

[0017] The sixth control valve has an A5 port, a B5 port, a P5 port, and a T5 port. The P5 port is connected to the first oil supply branch. The A5 port and the B5 port are both connected to the rodless chamber of the ironing plate lifting cylinder. The T5 port is connected to the return oil circuit, which is connected to the oil tank. The sixth control valve enables one of the A5 port and the B5 port to be connected to the P5 port, and the other of the two ports to be connected to the T5 port. The sixth control valve also enables the A5 port and the T5 port to be connected, while the B5 port and the P5 port are simultaneously disconnected.

[0018] The seventh control valve has an A6 port, a B6 port, a P6 port, and a T6 port. The P6 port is connected to the third oil supply branch. The A6 port is configured to supply oil to the rodless chamber of the ironing plate lifting cylinder. The B6 port is configured to supply oil to the rod chamber of the ironing plate lifting cylinder. The T6 port is connected to the return oil circuit. The seventh control valve enables one of the A6 and B6 ports to be connected to the P6 port, and the other to be connected to the T6 port. The seventh control valve also enables the A6 and T6 ports to be connected, while the B6 and P6 ports are simultaneously disconnected.

[0019] As a preferred technical solution for the auxiliary hydraulic system of the paver main unit, the auxiliary hydraulic system of the paver main unit also includes an inlet and return oil filter installed in the return oil circuit, and the input end of the first hydraulic pump is connected to the oil tank through the inlet and return oil filter.

[0020] The auxiliary hydraulic system for the paver provided by this utility model has at least the following beneficial effects:

[0021] The paver's main auxiliary hydraulic system includes a first hydraulic pump, a priority valve group, and a cold start valve. The input end of the first hydraulic pump is connected to the oil tank, and the output end of the first hydraulic pump is connected to the main oil supply circuit. The priority valve group includes a first priority valve and a second priority valve. The input end of the first priority valve is connected to the main oil supply circuit, the first output end of the first priority valve is connected to the first oil supply branch, the second output end of the first priority valve is connected to the input end of the second priority valve, the first output end of the second priority valve is connected to the second oil supply branch, and the second output end of the second priority valve is connected to the third oil supply branch. The first, second, and third oil supply branches are all used to supply hydraulic oil to the actuators. The cold start valve has a first input port and a first output port. The first input port is connected to the output end of the first hydraulic pump, and the first output port is connected to the input end of the first hydraulic pump. The cold start valve can connect or disconnect the first input port and the first output port. The auxiliary hydraulic system for the paver provided in this embodiment connects the first input port and the first output port of the cold start valve when starting the machine under low temperature conditions. At this time, the first hydraulic pump and the cold start valve will form a closed loop circuit, reducing the load at the outlet end of the first hydraulic pump, so that the engine can start smoothly and thus avoid engine damage. After the engine starts successfully, the cold start valve disconnects the connection between the first input port and the first output port.

[0022] On the other hand, this utility model provides a paver, including the paver main auxiliary hydraulic system in any of the above-mentioned solutions, wherein the engine is connected to the first hydraulic pump in a transmission connection.

[0023] The paver provided by this utility model has at least the following beneficial effects:

[0024] The paver includes the aforementioned auxiliary hydraulic system for the main paver, which ensures smooth engine startup and prevents engine damage when starting the machine in low-temperature conditions. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the auxiliary hydraulic system of the paver main unit in an embodiment of this utility model.

[0026] In the picture:

[0027] 1. First hydraulic pump; 2. Engine; 3. Oil tank; 4. Main oil supply circuit; 5. First priority valve; 6. Second priority valve; 7. Cold start valve; 8. First control valve; 9. Second control valve; 10. Tensioning cylinder; 11. Third control valve; 12. Leveling cylinder; 13. Fourth control valve; 14. Agitator lifting cylinder; 15. First hydraulic check valve; 16. Second hydraulic check valve; 17. Fifth control valve; 18. Hopper opening and closing cylinder ; 19. Hopper opening and closing small cylinder; 20. Sixth control valve; 21. Seventh control valve; 22. Ironing plate lifting cylinder; 23. Unloading valve; 24. Inlet and return oil filters; 241. First filter; 242. Second filter; 243. First back pressure valve; 25. Oil cooler; 26. Second back pressure valve; 27. First oil supply branch; 28. Second oil supply branch; 29. ​​Third oil supply branch; 30. Return oil circuit; 31. Second hydraulic pump. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In related technologies, the auxiliary hydraulic system of the paver's main unit often experiences engine starting failures due to the high viscosity of the hydraulic oil during low-temperature starting. This high viscosity causes significant resistance to the hydraulic pump's rotation. When the user fails to start the engine, they may continue to attempt to start it. Furthermore, the aftertreatment system is prone to clogging due to the difficulty in starting the engine at low temperatures, resulting in a large amount of particulate matter. If the aftertreatment system becomes clogged during startup, the combustion process cannot start properly because the engine is not functioning normally. The carbon deposits produced when restarting the engine can cause piston ring sticking, leading to engine cylinder scoring and ultimately damaging the engine itself.

[0033] To address this issue, this embodiment provides an auxiliary hydraulic system for a paver main unit. This auxiliary hydraulic system can be applied to a paver and used for material conveying operations.

[0034] Please refer to Figure 1The auxiliary hydraulic system of the paver includes a first hydraulic pump 1, a priority valve group, and a cold start valve 7. The first hydraulic pump 1 is used for transmission connection with the engine 2. The input end of the first hydraulic pump 1 is connected to the oil tank 3, and the output end of the first hydraulic pump 1 is connected to the main oil supply circuit 4. The priority valve group includes a first priority valve 5 and a second priority valve 6. The input end of the first priority valve 5 is connected to the main oil supply circuit 4. The first output end of the first priority valve 5 is connected to the first oil supply branch 27. The second output end of the first priority valve 5 is connected to the input end of the second priority valve 6. The first output end of the second priority valve 6 is connected to the second oil supply branch 28. The second output end of the second priority valve 6 is connected to the third oil supply branch 29. The first oil supply branch 27, the second oil supply branch 28, and the third oil supply branch 29 are all used to supply hydraulic oil to the actuator. The cold start valve 7 has a first input port and a first output port. The first input port is connected to the output end of the first hydraulic pump 1, and the first output port is connected to the input end of the first hydraulic pump 1. The cold start valve 7 can connect or disconnect the first input port and the first output port.

[0035] The auxiliary hydraulic system for the paver provided in this embodiment connects the first input port and the first output port of the cold start valve 7 when starting the machine under low temperature conditions. At this time, the first hydraulic pump 1 and the cold start valve 7 will form a closed loop circuit, reducing the load at the outlet end of the first hydraulic pump 1, so that the engine 2 can start smoothly and thus avoid damage to the engine 2. After the engine 2 starts successfully, the cold start valve 7 disconnects the connection between the first input port and the first output port.

[0036] In this embodiment, the actual temperature of the hydraulic oil can be collected by a temperature sensor. The controller obtains the collected actual temperature of the hydraulic oil and then compares it with a preset temperature. When the actual temperature of the hydraulic oil does not exceed the preset temperature, it is considered a low-temperature operating condition; when the actual temperature of the hydraulic oil exceeds the preset temperature, it is considered a non-low-temperature operating condition. Similarly, the actual speed of engine 2 can be collected by a speed sensor. The controller obtains the actual speed of engine 2 and then compares it with a preset speed. When the actual speed of engine 2 does not exceed the preset speed, it is considered to be in a start-up condition; when the actual speed of engine 2 exceeds the preset speed, it is considered that engine 2 has started successfully. Therefore, when the actual temperature of the hydraulic oil does not exceed the preset temperature and the actual speed of engine 2 does not exceed the preset speed, it can be determined that a low-temperature start-up is in progress, and the cold start valve 7 connects the first input port and the first output port. When the actual temperature of the hydraulic oil exceeds the preset temperature or the actual speed of engine 2 exceeds the preset speed, the cold start valve 7 disconnects the first input port and the first output port.

[0037] It should be noted that the specific value of the preset temperature can be set according to actual needs. For example, this embodiment provides a scheme with a preset temperature of 0℃. Similarly, the specific value of the preset speed can also be set according to actual needs. For example, this embodiment provides a scheme with a preset speed of 500rpm.

[0038] In some embodiments, the cold start valve 7 is a two-position two-way solenoid valve. The first input port and the first output port can be connected or disconnected by energizing and de-energizing the solenoid terminal of the cold start valve 7.

[0039] In this embodiment, the first priority valve 5 is used to preferentially supply hydraulic oil to the first oil supply branch 27, and the excess oil is supplied to the second priority valve 6. The second priority valve 6 is used to preferentially supply hydraulic oil to the second oil supply branch 28, and the excess hydraulic oil is supplied to the third oil supply branch 29. The priority valves are existing technology, and the specific structures of the first priority valve 5 and the second priority valve 6 will not be described in detail here.

[0040] In some embodiments, the actuator includes a braking actuator, which includes a first control valve 8 and a brake cylinder (not shown in the figures). The first control valve 8 includes a second input port, a second output port, and a return port. The second input port is connected to the first oil supply branch 27, the second output port is connected to the rodless chamber of the brake cylinder, and the return port is connected to the return oil passage 30. The return oil passage 30 is connected to the oil tank 3. The first control valve 8 can connect one of the second input port and the return port to the second output port and disconnect the other of the second input port and the return port. With this configuration, when the first control valve 8 connects the second input port and the second output port, and the return port is disconnected, the hydraulic oil in the first oil supply branch 27 will enter the brake cylinder and drive the piston rod of the brake cylinder to extend and perform braking; when the first control valve 8 connects the return port and the second output port, and the second input port is disconnected, the piston rod of the brake cylinder will retract under the action of the spring in the rod chamber of the brake cylinder, and the hydraulic oil in the rodless chamber of the brake cylinder will flow back to the oil tank 3 through the return port and the return oil passage 30.

[0041] Specifically, in this embodiment, the first control valve 8 is a two-position three-way solenoid valve. By energizing or de-energizing the solenoid terminal of the first control valve 8, one of the second input port and the return port can be connected to the second output port, while the other of the second input port and the return port can be disconnected. In other embodiments, the first control valve 8 can also be configured as a three-position three-way valve, or a hydraulically controlled valve, etc., as needed.

[0042] In some embodiments, the actuator further includes a tensioning actuator, which includes a second control valve 9 and a tensioning cylinder 10. The second control valve 9 has an A1 port, a B1 port, a P1 port, and a T1 port. The P1 port is connected to the first oil supply branch 27, the A1 port is connected to the rod chamber of the tensioning cylinder 10, the B1 port is connected to the rodless chamber of the tensioning cylinder 10, and the T1 port is connected to the return oil line 30. The second control valve 9 enables one of the A1 port and the B1 port to be connected to the P1 port, and the other of the two ports to be connected to the T1 port. With this configuration, when the second control valve 9 connects port P1 to port A1 and port B1 to port T1, the hydraulic oil in the first oil supply branch 27 will enter the rod chamber of the tension cylinder 10 through ports P1 and A1. The hydraulic oil in the rodless chamber of the tension cylinder 10 will enter the return oil circuit 30 through ports B1 and T1, and then flow back to the oil tank 3. The piston rod of the tension cylinder 10 will retract, and the piston rod of the tension cylinder 10 will simultaneously drive the end of the ironing board. Action: When the second control valve 9 connects port P1 and port B1, and port A1 and port T1, the hydraulic oil in the first oil supply branch 27 will enter the rodless chamber of the tension cylinder 10 through port P1 and port B1, and the hydraulic oil in the rod chamber of the tension cylinder 10 will enter the return oil circuit 30 through port A1 and port T1, and then flow back to the oil tank 3. The piston rod of the tension cylinder 10 extends, and the piston rod of the tension cylinder 10 simultaneously drives the end of the ironing board to move.

[0043] Specifically, in this embodiment, two stretching cylinders 10 are provided, and the two stretching cylinders 10 are simultaneously controlled by the second control valve 9. The two stretching cylinders 10 act on both ends of the ironing board in the width direction respectively.

[0044] In this embodiment, the second control valve 9 is specifically a two-position four-way solenoid valve. By energizing or de-energizing the solenoid terminal of the second control valve 9, it can connect port P1 to port B1 and port A1 to port T1; or, it can connect port P1 to port A1 and port B1 to port T1. In other embodiments, the second control valve 9 can also be configured as a three-position four-way valve, or a hydraulically controlled valve, etc., as needed.

[0045] In some embodiments, the actuator further includes a leveling actuator, which includes a third control valve 11 and a leveling cylinder 12. The third control valve 11 has an A2 port, a B2 port, a P2 port, and a T2 port. The P2 port is connected to the second oil supply branch 28, the A2 port is connected to the rod chamber of the leveling cylinder 12, the B2 port is connected to the rodless chamber of the leveling cylinder 12, and the T2 port is connected to the return oil circuit 30. The third control valve 11 enables one of the A2 port and the B2 port to be connected to the P2 port, and the other of the two ports to be connected to the T2 port. The third control valve 11 also enables the A2 port, the B2 port, the P2 port, and the T2 port to be connected simultaneously. With this configuration, when the third control valve 11 connects ports P2 and A2, and ports T2 and B2, the hydraulic oil in the second oil supply branch 28 will be sequentially delivered to the rod chamber of the leveling cylinder 12 through ports P2 and A2. The hydraulic oil in the rodless chamber of the leveling cylinder 12 will then sequentially flow back to the oil tank 3 through ports B2, T2, and the return oil line 30. The piston rod of the leveling cylinder 12 will retract, and the piston rod will simultaneously adjust the overall angle of the screed relative to the horizontal plane. When the third control valve 11 connects ports P2 and B2, and ports T2 and B2... When connected to port A2, the hydraulic oil in the second oil supply branch 28 will be delivered to the rodless chamber of the leveling cylinder 12 through ports P2 and B2 in sequence. The hydraulic oil in the rod chamber of the leveling cylinder 12 will flow back to the oil tank 3 through ports A2, T2 and the return oil line 30 in sequence. The piston rod of the leveling cylinder 12 extends and synchronously reverses to adjust the overall angle of the ironing plate relative to the horizontal plane. When the third control valve 11 connects ports A2, B2, P2 and T2 at the same time, the hydraulic oil in the second oil supply branch 28 will flow back to the oil tank 3.

[0046] Specifically, in this embodiment, the third control valve 11 is a three-position four-way solenoid valve. The valve core movement of the third control valve 11 enables it to have a first left position, a first neutral position, and a first right position. When the third control valve 11 is in the first right position, it connects port P2 and port A2, and also connects port B2 and port T2. When the third control valve 11 is in the first neutral position, it simultaneously connects ports P2, T2, A2, and B2. When the third control valve 11 is in the first left position, it connects ports P2 and B2, and also connects ports A2 and T2. In other embodiments, the third control valve 11 may also be a three-position four-way hydraulic valve, etc.

[0047] Optionally, the leveling actuator also includes a hydraulic lock on the connecting pipeline between the A2 oil port and the rod chamber of the leveling cylinder 12, and a balance valve on the connecting pipeline between the B2 oil port and the rodless chamber of the leveling cylinder 12.

[0048] In some embodiments, the actuator further includes a cage lifting actuator, which includes a fourth control valve 13 and a cage lifting cylinder 14. The fourth control valve 13 has an A3 port, a B3 port, a P3 port, and a T3 port. The P3 port is connected to the third oil supply branch 29, the A3 port is connected to the rod chamber of the cage lifting cylinder 14, the B3 port is connected to the rodless chamber of the cage lifting cylinder 14, and the T3 port is connected to the return oil circuit 30. The fourth control valve 13 enables one of the A3 and B3 ports to be connected to the P3 port and the other to be connected to the T3 port. The fourth control valve 13 also enables the A3, B3, and T3 ports to be connected simultaneously, while the P3 port is disconnected. With this configuration, when the fourth control valve 13 connects ports P3 and A3, and ports T3 and B3, the hydraulic oil in the third oil supply branch 29 will be sequentially delivered through ports P3 and A3 to the rod chamber of the stirring cage lifting cylinder 14. The hydraulic oil in the rodless chamber of the stirring cage lifting cylinder 14 will then sequentially flow back to the oil tank 3 through ports B3, T3, and the return oil line 30. The piston rod of the stirring cage lifting cylinder 14 will retract, and the piston rod will drive the stirring cage to move synchronously. When the fourth control valve 13 connects ports P3 and B3, and ports T3 and A3... When the oil ports are connected, the hydraulic oil in the third oil supply branch 29 will be delivered to the rodless chamber of the stirring cage lifting cylinder 14 through the P3 oil port and the B3 oil port in sequence. The hydraulic oil in the rod chamber of the stirring cage lifting cylinder 14 will flow back to the oil tank 3 through the A3 oil port, the T3 oil port and the return oil line 30 in sequence. The piston rod of the stirring cage lifting cylinder 14 will extend to adjust the height of the stirring cage. When the fourth control valve 13 connects the A3 oil port, the B3 oil port and the T3 oil port at the same time and the P3 oil port is disconnected, the third oil supply branch 29 will no longer supply hydraulic oil to the stirring cage lifting cylinder 14.

[0049] Specifically, in this embodiment, the fourth control valve 13 is a three-position four-way solenoid valve. The valve core movement of the fourth control valve 13 enables it to have a second left position, a second neutral position, and a second right position. When the fourth control valve 13 is in the second right position, it connects ports P3 and A3, and ports B3 and T3. When the fourth control valve 13 is in the second neutral position, it disconnects port P3 and simultaneously connects ports T3, A3, and B3. When the fourth control valve 13 is in the second left position, it connects ports P3 and B3, and ports A3 and T3. In other embodiments, the fourth control valve 13 may also be a three-position four-way hydraulic control valve, etc.

[0050] In some embodiments, the auger lifting actuator further includes a first hydraulic check valve 15 and a second hydraulic check valve 16. The input end of the first hydraulic check valve 15 is connected to port A3, the output end of the first hydraulic check valve 15 is connected to the rod chamber of the auger lifting cylinder 14, the pilot control end of the first hydraulic check valve 15 is connected to port B3, the input end of the second hydraulic check valve 16 is connected to port B3, the output end of the second hydraulic check valve 16 is connected to the rodless chamber of the auger lifting cylinder 14, and the pilot control end of the second hydraulic check valve 16 is connected to port A3. With this configuration, when the fourth control valve 13 is in the second right position or the second left position, the hydraulic oil pressure at port P3 is greater than the hydraulic oil pressure in the rod chamber and rodless chamber of the auger lifting cylinder 14. As a result, one of the first hydraulic check valve 15 and the second hydraulic check valve 16 can open directly under the action of the oil pressure difference between its input and output ends, while the other opens under the action of the oil pressure at the pilot control end. This allows oil to enter one of the rod chamber and the rodless chamber of the auger lifting cylinder 14, and oil to exit the other. When the fourth control valve 13 is in the second neutral position, ports A3, B3, and T3 are simultaneously connected, and port P3 is disconnected. The first hydraulic check valve 1513 and the second hydraulic check valve 1614 will remain closed, thus locking the auger lifting cylinder 14.

[0051] In some embodiments, the actuator further includes a hopper opening and closing actuator, which includes a fifth control valve 17, a large hopper opening and closing cylinder 18, and a small hopper opening and closing cylinder 19. The fifth control valve 17 has an A4 port, a B4 port, a P4 port, and a T4 port. The P4 port is connected to the third oil supply branch 29. The A4 port is connected to the rod chamber of the small hopper opening and closing cylinder 19. The B4 port is connected to the rodless chamber of the small hopper opening and closing cylinder 19 and the chamber of the large hopper opening and closing cylinder 18. The T4 port is connected to the return oil line 30. The fifth control valve 17 can connect one of the A4 port and the B4 port to the P4 port and the other of the two ports to the T4 port. The fifth control valve 17 can also disconnect the A4 port, the B4 port, the T4 port, and the P4 port simultaneously. With this configuration, when the fifth control valve 17 connects ports P4 and A4, and ports T4 and B4, the hydraulic oil from the third oil supply branch 29 will sequentially be delivered through ports P4 and A4 to the rod chamber of the hopper opening / closing cylinder 19. The hydraulic oil in the rodless chamber of the hopper opening / closing cylinder 19 and the hydraulic oil in the hopper opening / closing cylinder 18 will sequentially flow back to the oil tank 3 through ports B4, T4, and the return oil line 30. The piston rod of the hopper opening / closing cylinder 19 will retract, and the hopper opening / closing cylinder 18 will also retract. When the fifth control valve 17 connects ports P4 and B4, and ports T4 and A4, the hydraulic oil will flow back to the oil tank 3. When the hydraulic oil in the third oil supply branch 29 is supplied sequentially through the P4 oil port and the B4 oil port to the rodless chamber of the hopper opening and closing small oil cylinder 19 and the hopper opening and closing large oil cylinder 18, the hydraulic oil in the rod chamber of the hopper opening and closing small oil cylinder 19 flows back to the oil tank 3 sequentially through the A4 oil port, the T4 oil port and the return oil line 30. The piston rod of the hopper opening and closing small oil cylinder 19 extends, and the hopper opening and closing large oil cylinder 18 also extends, thereby controlling the opening and closing of the hopper. When the fifth control valve 17 disconnects the A4 oil port, the B4 oil port, the T4 oil port and the P4 oil port at the same time, the hopper opening and closing small oil cylinder 17 and the hopper opening and closing large oil cylinder 18 will maintain a constant extension and retraction length.

[0052] Specifically, in this embodiment, the fifth control valve 17 is a three-position four-way solenoid valve. The valve core movement of the fifth control valve 17 enables it to have a third left position, a third center position, and a third right position. When the fifth control valve 17 is in the third right position, it connects ports P4 and A4, and ports B4 and T4. When the fifth control valve 17 is in the third center position, it simultaneously disconnects ports P4, T4, A4, and B4. When the fifth control valve 17 is in the third left position, it connects ports P4 and B4, and ports A4 and T4. In other embodiments, the fifth control valve 17 may also be a three-position four-way hydraulic control valve, etc.

[0053] In some embodiments, the actuator further includes an ironing plate lifting actuator, which includes a sixth control valve 20, a seventh control valve 21, and an ironing plate lifting cylinder 22. The sixth control valve 20 has an A5 port, a B5 port, a P5 port, and a T5 port. The P5 port is connected to the first oil supply branch 27, the A5 and B5 ports are both connected to the rodless chamber of the ironing plate lifting cylinder 22, and the T5 port is connected to the return oil circuit 30. The sixth control valve 20 enables one of the A5 and B5 ports to be connected to the P5 port, and the other to be connected to the T5 port. The sixth control valve 20 also enables the A5 port and the T5 port to be connected to each other. The oil ports are connected, and oil ports B5 and P5 are simultaneously disconnected; the seventh control valve 21 has oil ports A6, B6, P6 and T6. Oil port P6 is connected to the third oil supply branch 29. Oil port A6 is configured to supply oil to the rodless chamber of the ironing plate lifting cylinder 22. Oil port B6 is configured to supply oil to the rod chamber of the ironing plate lifting cylinder 22. Oil port T6 is connected to the return oil circuit 30. The seventh control valve 21 can connect one of oil ports A6 and B6 to oil port P6, and the other of them to oil port T6. The seventh control valve 21 can also connect oil ports A6 and T6, and disconnect oil ports B6 and P6 simultaneously.

[0054] For the sixth control valve 20, regardless of whether port A5 or port B5 is connected to port P5, the hydraulic oil in the first oil supply branch 27 is supplied to the rodless chamber of the ironing plate lifting cylinder 22 through the sixth control valve 20. Thus, the piston rod of the ironing plate lifting cylinder 22 can be extended independently by the sixth control valve 20 to push the ironing plate independently. When the sixth control valve 20 connects port A5 and port T5 and simultaneously disconnects port B5 and port P5, the oil in the rodless chamber of the ironing plate lifting cylinder 22 can be returned to the oil tank 3 through the return oil circuit 30.

[0055] For the seventh control valve 21, when the seventh control valve 21 connects ports P6 and A6, and ports T6 and B6, the hydraulic oil in the third oil supply branch 29 will be sequentially delivered to the rodless chamber of the ironing plate lifting cylinder 22 through ports P6 and A6. The hydraulic oil in the rod chamber of the ironing plate lifting cylinder 22 will then sequentially flow back to the oil tank 3 through ports B6, T6, and the return oil line 30. The piston rod of the ironing plate lifting cylinder 22 will extend, and the piston rod will drive the ironing plate to move synchronously. When the seventh control valve 21 connects ports P6 and B6, and ports T6 and A6, the third oil supply branch... Hydraulic oil from cylinder 29 is sequentially supplied to the rod chamber of the ironing plate lifting cylinder 22 through port P6 and port B6. Hydraulic oil in the rodless chamber of the ironing plate lifting cylinder 22 flows back to the oil tank 3 sequentially through port A6, port T6, and return oil circuit 30. The piston rod of the ironing plate lifting cylinder 22 retracts to adjust the height of the ironing plate. When the seventh control valve 21 connects ports A6, B6, and T6 simultaneously and port P6 is disconnected, the third oil supply branch 29 will no longer supply hydraulic oil to the ironing plate lifting cylinder 22, and the hydraulic oil in the rodless chamber of the ironing plate lifting cylinder 22 will flow back to the oil tank 3 through the return oil circuit 30.

[0056] Specifically, in this embodiment, the sixth control valve 20 is a three-position four-way solenoid valve. The valve core movement of the sixth control valve 20 enables it to have a fourth left position, a fourth middle position, and a fourth right position. When the sixth control valve 20 is in the fourth right position, it connects ports P5 and A5, and ports B5 and T5. When the sixth control valve 20 is in the fourth middle position, it disconnects ports P5 and B5, and connects ports T5 and A5. When the sixth control valve 20 is in the fourth left position, it connects ports P5 and B5, and ports A5 and T5. In other embodiments, the sixth control valve 20 may also be a three-position four-way hydraulic control valve, etc.

[0057] The seventh control valve 21 is a three-position four-way solenoid valve. The valve core movement of the seventh control valve 21 allows it to have three positions: a fifth left position, a fifth neutral position, and a fifth right position. When the seventh control valve 21 is in the fifth right position, it connects ports P6 and A6, and ports B6 and T6. When the seventh control valve 21 is in the fifth neutral position, it disconnects ports P6 and B6, and connects ports T6 and A6. When the seventh control valve 21 is in the fifth left position, it connects ports P6 and B6, and ports A6 and T6. In other embodiments, the seventh control valve 21 can also be a three-position four-way hydraulic valve, etc.

[0058] In some embodiments, the ironing board lifting actuator further includes an electromagnetic unloading valve 23, which is a two-position four-way electromagnetic valve. The electromagnetic unloading valve 23 enables the return oil passage 30 to be simultaneously connected to the rod chamber and the rod chamber of the ironing board lifting cylinder 22; the electromagnetic unloading valve 23 also enables the return oil passage 30 to be simultaneously disconnected from the rod chamber and the rod chamber of the ironing board lifting cylinder 22.

[0059] In some embodiments, the paver's main auxiliary hydraulic system further includes an inlet / return oil filter 24 disposed in the return oil circuit 30, and the input end of the first hydraulic pump 1 is connected to the oil tank 3 through the inlet / return oil filter 24. By providing the inlet / return oil filter 24, the hydraulic oil entering the first hydraulic pump 1 and the hydraulic oil returning to the oil tank 3 through the return oil circuit 30 can be filtered simultaneously.

[0060] Specifically, the inlet and outlet oil filter 24 includes a first filter 241 connected between the input end of the first hydraulic pump 1 and the oil tank 3, and a second filter 242 and a first back pressure valve 243 located between the return oil passage 30 and the oil tank 3. Under the drive of the first hydraulic pump 1, the hydraulic oil in the oil tank 3 enters the first hydraulic pump 1 after being filtered by the first filter 241; the hydraulic oil in the return oil passage 30 flows back to the oil tank 3 through the second filter 242 and the first back pressure valve 243.

[0061] In some embodiments, the paver's main auxiliary hydraulic system further includes an oil cooler 25 disposed in the return oil circuit 30, and a second back pressure valve 26 disposed in parallel with the oil cooler 25. This configuration allows the oil cooler 25 to cool and reduce the temperature of the flowing hydraulic oil, and when the oil cooler 25 becomes blocked, the hydraulic oil can bypass the oil cooler 25 through the second back pressure valve 26 and continue to flow back to the oil tank 3.

[0062] This embodiment also provides a paver, which includes the aforementioned paver main auxiliary hydraulic system and an engine 2, which is connected to the first hydraulic pump 1. When the engine 2 is started under low-temperature conditions, the cold start valve 7 disconnects the first input port and the first output port, reducing the load on the outlet of the first hydraulic pump 1 and allowing the engine 2 to start smoothly.

[0063] In some embodiments, the paver further includes a second hydraulic pump 31, which is a dual pump with the first hydraulic pump 1, and the first hydraulic pump 1 and the second hydraulic pump 31 are driven by the engine 2 together. The second hydraulic pump 31 is used to supply hydraulic oil to the hydraulic system for extending and retracting the screed.

[0064] In some embodiments, the second hydraulic pump 31 is connected in parallel with a control valve, which is used to bypass both ends of the second hydraulic pump 31 when the engine 2 is started under low-temperature conditions.

[0065] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in this utility model is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above-described features with, but not limited to, technical features disclosed in this utility model that have similar functions.

[0066] Furthermore, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0067] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A paver main unit auxiliary hydraulic system, characterized in that, include: The first hydraulic pump (1) is used to drive the engine (2). The input end of the first hydraulic pump (1) is connected to the oil tank (3), and the output end of the first hydraulic pump (1) is connected to the main oil supply circuit (4). The priority valve group includes a first priority valve (5) and a second priority valve (6). The input end of the first priority valve (5) is connected to the main oil supply circuit (4). The first output end of the first priority valve (5) is connected to the first oil supply branch (27). The second output end of the first priority valve (5) is connected to the input end of the second priority valve (6). The first output end of the second priority valve (6) is connected to the second oil supply branch (28). The second output end of the second priority valve (6) is connected to the third oil supply branch (29). The first oil supply branch (27), the second oil supply branch (28) and the third oil supply branch (29) are all used to supply hydraulic oil to the actuator. The cold start valve (7) has a first input port and a first output port. The first input port is connected to the output end of the first hydraulic pump (1), and the first output port is connected to the input end of the first hydraulic pump (1). The cold start valve (7) can connect or disconnect the first input port and the first output port.

2. The auxiliary hydraulic system for the paver main unit according to claim 1, characterized in that, The actuator includes a braking actuator, which includes a first control valve (8) and a brake cylinder. The first control valve (8) includes a second input port, a second output port, and a return port. The second input port is connected to the first oil supply branch (27), the second output port is connected to the rodless chamber of the brake cylinder, the return port is connected to the return oil circuit (30), and the return oil circuit (30) is connected to the oil tank (3). The first control valve (8) enables one of the second input port and the return port to be connected to the second output port, and enables the other of the second input port and the return port to be disconnected.

3. The auxiliary hydraulic system for the paver main unit according to claim 1, characterized in that, The actuator further includes a tension actuator, which includes a second control valve (9) and a tension cylinder (10). The second control valve (9) has an A1 port, a B1 port, a P1 port and a T1 port. The P1 port is connected to the first oil supply branch (27). The A1 port is connected to the rod chamber of the tension cylinder (10). The B1 port is connected to the rodless chamber of the tension cylinder (10). The T1 port is connected to the return oil circuit (30). The return oil circuit (30) is connected to the oil tank (3). The second control valve (9) enables one of the A1 port and the B1 port to be connected to the P1 port, and the other of the two ports to be connected to the T1 port.

4. The auxiliary hydraulic system for the paver main unit according to claim 1, characterized in that, The actuator also includes a leveling actuator, which includes a third control valve (11) and a leveling cylinder (12). The third control valve (11) has an A2 port, a B2 port, a P2 port and a T2 port. The P2 port is connected to the second oil supply branch (28). The A2 port is connected to the rod chamber of the leveling cylinder (12). The B2 port is connected to the rodless chamber of the leveling cylinder (12). The T2 port is connected to the return oil circuit (30). The return oil circuit (30) is connected to the oil tank (3). The third control valve (11) enables one of the A2 port and the B2 port to be connected to the P2 port, and the other of the two ports to be connected to the T2 port. The third control valve (11) also enables the A2 port, the B2 port, the P2 port and the T2 port to be connected simultaneously.

5. The auxiliary hydraulic system for the paver main unit according to claim 1, characterized in that, The actuator also includes a cage lifting actuator, which includes a fourth control valve (13) and a cage lifting cylinder (14). The fourth control valve (13) has an A3 port, a B3 port, a P3 port and a T3 port. The P3 port is connected to the third oil supply branch (29). The A3 port is connected to the rod chamber of the cage lifting cylinder (14). The B3 port is connected to the rodless chamber of the cage lifting cylinder (14). The T3 port is connected to the return oil circuit (30). The return oil circuit (30) is connected to the oil tank (3). The fourth control valve (13) enables one of the A3 port and the B3 port to be connected to the P3 port and the other to be connected to the T3 port. The fourth control valve (13) also enables the A3 port, the B3 port and the T3 port to be connected simultaneously, and the P3 port to be disconnected.

6. The auxiliary hydraulic system for the paver main unit according to claim 5, characterized in that, The lifting actuator of the auger also includes a first hydraulic check valve (15) and a second hydraulic check valve (16). The input end of the first hydraulic check valve (15) is connected to the A3 port, the output end of the first hydraulic check valve (15) is connected to the rod chamber of the lifting cylinder (14), the pilot control end of the first hydraulic check valve (15) is connected to the B3 port, the input end of the second hydraulic check valve (16) is connected to the B3 port, the output end of the second hydraulic check valve (16) is connected to the rodless chamber of the lifting cylinder (14), and the pilot control end of the second hydraulic check valve (16) is connected to the A3 port.

7. The auxiliary hydraulic system for the paver main unit according to claim 1, characterized in that, The actuator also includes a hopper opening and closing actuator, which includes a fifth control valve (17), a large hopper opening and closing cylinder (18), and a small hopper opening and closing cylinder (19). The fifth control valve (17) has an A4 port, a B4 port, a P4 port, and a T4 port. The P4 port is connected to the third oil supply branch (29), the A4 port is connected to the rod chamber of the small hopper opening and closing cylinder (19), and the B4 port is connected to the small hopper opening and closing cylinder (19). The rodless chamber and the chamber of the hopper opening and closing cylinder (18) are connected. The T4 oil port is connected to the return oil circuit (30). The return oil circuit (30) is connected to the oil tank (3). The fifth control valve (17) enables one of the A4 oil port and the B4 oil port to be connected to the P4 oil port, and the other one to be connected to the T4 oil port. The fifth control valve (17) also enables the A4 oil port, the B4 oil port, the T4 oil port and the P4 oil port to be disconnected at the same time.

8. The auxiliary hydraulic system for the paver main unit according to claim 1, characterized in that, The actuator also includes an ironing plate lifting actuator, which includes a sixth control valve (20), a seventh control valve (21), and an ironing plate lifting cylinder (22). The sixth control valve (20) has an A5 port, a B5 port, a P5 port and a T5 port. The P5 port is connected to the first oil supply branch (27). The A5 port and the B5 port are both connected to the rodless chamber of the ironing plate lifting cylinder (22). The T5 port is connected to the return oil circuit (30). The return oil circuit (30) is connected to the oil tank (3). The sixth control valve (20) enables one of the A5 port and the B5 port to be connected to the P5 port, and the other of the two ports to be connected to the T5 port. The sixth control valve (20) also enables the A5 port and the T5 port to be connected, and the B5 port and the P5 port to be disconnected at the same time. The seventh control valve (21) has an A6 port, a B6 port, a P6 port and a T6 port. The P6 port is connected to the third oil supply branch (29). The A6 port is configured to supply oil to the rodless chamber of the ironing plate lifting cylinder (22). The B6 port is configured to supply oil to the rod chamber of the ironing plate lifting cylinder (22). The T6 port is connected to the return oil circuit (30). The seventh control valve (21) enables one of the A6 port and the B6 port to be connected to the P6 port, and the other of the two ports to be connected to the T6 port. The seventh control valve (21) also enables the A6 port and the T6 port to be connected, and the B6 port and the P6 port to be disconnected simultaneously.

9. The auxiliary hydraulic system for the paver main unit according to any one of claims 2-8, characterized in that, The auxiliary hydraulic system of the paver also includes an inlet and return oil filter (24) installed in the return oil circuit (30), and the input end of the first hydraulic pump (1) is connected to the oil tank (3) through the inlet and return oil filter (24).

10. A paver, characterized in that, The paver includes the auxiliary hydraulic system of the paver main unit as described in any one of claims 1-9, and the paver further includes an engine (2), which is connected to the first hydraulic pump (1) in a transmission connection.

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