阅读说明：本技术 摊铺机液压系统与摊铺机 (Paver hydraulic system and paver ) 是由 汪建利 陈嫦 王康 于 2019-11-26 设计创作，主要内容包括：本发明提出了一种摊铺机液压系统与摊铺机,其中,摊铺机液压系统包括：液压泵；油箱,液压泵的进液端与油箱相连接；充液阀组,充液阀组具有第一进流口、第一出流口、第一工作口与第二工作口,第一进流口与液压泵的出液端相连接,第一进流口与第一工作口连接,第一出流口与油箱连接；蓄能器,与第一工作口连接；换挡制动系统,与连接蓄能器与和第一工作口之间的流路连接；转向系统,与第二工作口连接；其中,第一进流口与第二工作口之间的连接油路可选择性的连通和断开。本发明提出的摊铺机液压系统,包括液压泵、油箱、充液阀组、蓄能器、换挡制动系统、转向系统,采用一个液压源就能同时为换挡制动系统与转向系统提供动力,液压系统简单。(The invention provides a hydraulic system of a paver and the paver, wherein the hydraulic system of the paver comprises: a hydraulic pump; the liquid inlet end of the hydraulic pump is connected with the oil tank; the liquid filling valve group is provided with a first inlet, a first outlet, a first working port and a second working port, the first inlet is connected with the liquid outlet end of the hydraulic pump, the first inlet is connected with the first working port, and the first outlet is connected with the oil tank; the energy accumulator is connected with the first working port; the gear shifting brake system is connected with a flow path between the connecting energy accumulator and the first working port; the steering system is connected with the second working port; and the connecting oil path between the first inlet and the second working port can be selectively communicated and disconnected. The hydraulic system of the paver provided by the invention comprises a hydraulic pump, an oil tank, a liquid filling valve group, an energy accumulator, a gear shifting braking system and a steering system, can simultaneously provide power for the gear shifting braking system and the steering system by adopting one hydraulic source, and is simple.)

1. A paver hydraulic system, comprising:

a hydraulic pump (10);

the liquid inlet end of the hydraulic pump (10) is connected with the oil tank (80);

a liquid-filled valve group (20), wherein the liquid-filled valve group (20) is provided with a first inlet (202), a first outlet (204), a first working port (206) and a second working port (208), the first inlet (202) of the liquid-filled valve group (20) is connected with an outlet of the hydraulic pump (10), the first inlet (202) of the liquid-filled valve group (20) is connected with the first working port (206) of the liquid-filled valve group (20), and the first outlet (204) of the liquid-filled valve group (20) is connected with the oil tank (80);

an accumulator (30) connected to the first working port (206) of the fill valve block (20);

a shift brake system (40) connected to a flow path between the accumulator (30) and the first apply port (206) of the charge valve block (20);

a steering system (60) connected to the second workport (208) of the fill valve block (20);

the connecting oil path between the first inlet (202) and the second working port (208) can be selectively connected and disconnected, the connecting oil path between the first inlet (202) and the second working port (208) is disconnected under the condition that the pressure value of the first working port (206) is smaller than a preset pressure value, and the connecting oil path between the first inlet (202) and the second working port (208) is connected under the condition that the pressure value of the first working port (206) is larger than or equal to the preset pressure value.

2. The paver hydraulic system of claim 1, wherein the fill valve block (20) comprises:

a first valve body (22), the first valve body (22) having a second inlet (222), a second outlet (224), a first pilot port (226) and a second pilot port (228), the second inlet (222) of the first valve body (22) being connected to the first inlet (202) of the first valve body (22), the first pilot port (226) of the first valve body (22) being connected to the first inlet (202) of the filling valve block (20), the second outlet (224) of the first valve body (22) being connected to the second working port (208) of the filling valve block (20);

a second valve body (24), the second valve body (24) having a third inlet (242), a third outlet (244), and a third pilot port (246), the third inlet (242) of the second valve body (24) being connected to the first inlet (202) of the fill valve block (20), the third outlet (244) of the second valve body (24) being connected to the second pilot port (228) of the first valve body (22), the third pilot port (246) of the second valve body (24) being connected to the first working port (206) of the fill valve block (20), the third outlet (244) of the second valve body (24) being connected to the tank (80);

when the pressure value is smaller than the preset pressure value, the oil passages of the second valve body (24) and the first valve body (22) are in a closed state, the connection oil passage between the first inflow port (202) and the second working port (208) is disconnected, when the pressure value of the first working port (206) is larger than or equal to the preset pressure value, the second valve body (24) and the first valve body (22) are in a conducting state, and the connection oil passages between the first inflow port (202) and the second working port (208) are communicated.

3. The paver hydraulic system of claim 2, wherein the fill valve block (20) further comprises:

and the check valve (26) is arranged between the first inflow port (202) of the liquid-filled valve group (20) and the first working port (206) of the liquid-filled valve group (20), and is communicated from the first inflow port (202) to the first working port (206).

4. The paver hydraulic system of any one of claims 1 to 3, further comprising:

a pressure switch (70) connected to the first work port (206) of the fill valve block (20).

5. Paver hydraulic system according to any one of claims 1 to 3, characterized in that the shift brake system (40) comprises:

a gear shifting hydraulic cylinder (42) for realizing gear shifting operation of a gearbox (2) of the paver;

a shift hydraulic valve (44), wherein the shift hydraulic valve (44) has a fourth inlet (442), a fourth outlet (444), a third working port (446), and a fourth working port (448), the fourth inlet (442) of the shift hydraulic valve (44) is connected to the flow path between the accumulator (30) and the charge valve set (20), the third working port (446) of the shift hydraulic valve (44) and the fourth working port (448) of the shift hydraulic valve (44) are respectively connected to a rod chamber of the shift hydraulic cylinder (42) and a rodless chamber of the shift hydraulic cylinder (42), and the fourth outlet (444) of the shift hydraulic valve (44) is connected to the oil tank (80);

a first pressure relief valve (46) connected between the fourth outlet port (444) of the shift hydraulic valve (44) and a rod cavity of the shift hydraulic cylinder (42).

6. Paver hydraulic system as claimed in any one of claims 1 to 3, characterized in that the shift brake system (40) further comprises:

a service hydraulic brake (48) for effecting braking of a gearbox (2) of the paver;

a service brake valve (50), the service brake valve (50) having a fifth inlet port (502), a fifth outlet port (504), a fifth working port (506) and a sixth working port (508), the fifth inlet port (502) of the service brake valve (50) being connected in the flow path between the accumulator (30) and the charge valve block (20), the fifth working port (506) of the service brake valve (50) being connected to the service hydraulic brake (48), the fifth outlet port (504) of the service brake valve (50) being connected to the oil tank (80);

a second pressure reducing valve (52) connected between the fifth outlet port (504) of the service brake valve (50) and the sixth working port (508) of the service brake valve (50).

7. Paver hydraulic system according to any one of claims 1 to 3, characterized in that the shift brake system (40) comprises:

a parking hydraulic brake (54) for effecting braking of the gearbox (2);

the parking hydraulic valve (56) is provided with a sixth inlet (562), a sixth outlet (564), a seventh working port (566) and an eighth working port (568), the sixth inlet (562) of the parking hydraulic valve (56) is connected to a flow path between the accumulator (30) and the liquid filling valve set (20), the seventh working port (566) of the parking hydraulic valve (56) is connected with the parking hydraulic brake (54), and the sixth outlet (564) of the parking hydraulic valve (56) is connected with the oil tank (80).

8. Paver hydraulic system as claimed in any one of claims 1 to 3, characterized in that the steering system (60) comprises:

a steering hydraulic cylinder (62) for effecting steering of the paver;

the steering gear (64) is provided with a first control oil port and an oil inlet, is connected with the steering hydraulic cylinder (62), and is used for controlling the working state of the steering hydraulic cylinder (62);

a priority valve (66), the priority valve (66) having a seventh inlet port (662), a ninth working port (664), a second control port (666), a tenth working port (668) and a seventh outlet port (670), the seventh inlet port (662) of the priority valve (66) being connected with the second working port (208) of the fill valve block (20), the second control port (666) of the priority valve (66) being connected with the first control port of the diverter (64), the tenth working port (668) of the priority valve (66) being connected with the oil inlet of the diverter (64), the ninth working port (664) of the priority valve (66) being connected with the oil tank (80), the seventh outlet port (670) of the priority valve (66) being connected with the oil tank (80), when the diverter (64) is in operation, the first control oil port of the diverter (64) feeds back a pressure signal to a second control oil port (666), the seventh inlet (662) of the priority valve (66) is communicated with the tenth working port (668) of the priority valve (66), when the diverter (64) does not work, the first control oil port of the diverter (64) feeds back no pressure signal to the second control oil port (666), and the seventh inlet (662) of the priority valve (66) is communicated with the ninth working port (664) of the priority valve (66).

9. A paving machine, comprising:

paver hydraulic system (1) as claimed in any one of claims 1 to 8.

10. The paving machine of claim 9, further comprising:

the paver hydraulic system (1) is arranged on the paver body;

the ironing system is arranged at one end of the machine body;

the speed change system is arranged on the machine body, and the paver hydraulic system (1) can control the speed change system;

and the wheel system is connected with the speed change system so as to drive the wheel system to operate.

Technical Field

The invention relates to the technical field of pavers, in particular to a hydraulic system of a paver and the paver.

Background

At present, pavers for road and community road construction are divided into a rubber-tyred paver and a crawler-type paver, and the rubber-tyred paver has the advantages of high rotation speed, small turning radius and the like, and is widely applied to narrow road conditions such as communities and the like. The power transmission of the tire paver is generally divided into a mechanical type, a hydraulic type and a mechanical hydraulic type, the power of the mechanical transmission mode is transmitted by an engine-gearbox-axle-chain-transmission-wheel edge, the power transmission is stable, but the transmission path is long, and the structure is complex; the power of the hydraulic transmission mode is formed by an engine, a hydraulic pump, a hydraulic motor and a wheel edge, the transmission route is simple, but the system rigidity is poor; the mechanical hydraulic transmission combines the two advantages, and the power transmission route is as follows: engine-hydraulic pump-hydraulic motor-gearbox-chain-wheel side.

The transmission structure is widely applied, can meet the requirement of high-speed running of the paver, can also ensure low-speed stability during working, and is generally provided with a service brake, a parking brake, a multi-gear control gearbox, a steering system and the like for ensuring the reliability of the system.

The hydraulic system generally comprises a brake hydraulic system consisting of a hydraulic pump, a liquid charging valve and an energy accumulator, a steering system consisting of the hydraulic pump, a priority valve, a steering gear and the like, and an auxiliary hydraulic system consisting of the hydraulic pump and a control hydraulic element, wherein a plurality of independent oil sources are required, a plurality of installation interfaces are required to be matched, and the system is complex and high in cost.

Disclosure of Invention

The invention aims to at least solve the technical problems of complex structure and high cost of a mechanical and hydraulic combined transmission system of a paver in the prior art.

To this end, the embodiment of the first aspect of the invention provides a paver hydraulic system which is simple in structure and low in cost.

A second aspect of the present disclosure is directed to a paving machine that employs the paving machine hydraulic system described above.

In view of the above, according to a first aspect of the present invention, there is provided a paver hydraulic system comprising: a hydraulic pump; the liquid inlet end of the hydraulic pump is connected with the oil tank; the hydraulic pump comprises a hydraulic pump, a liquid filling valve group, a hydraulic pump, a hydraulic; the energy accumulator is connected with the first working port of the liquid filling valve bank; the gear shifting brake system is connected with a flow path between the connection accumulator and the first working port of the liquid charging valve group; the steering system is connected with the second working port of the liquid filling valve bank; the connecting oil circuit between the first inflow port and the second working port can be selectively communicated and disconnected, the connecting oil circuit between the first inflow port and the second working port is disconnected under the condition that the pressure value of the first working port is smaller than the preset pressure value, and the connecting oil circuit between the first inflow port and the second working port is communicated under the condition that the pressure value of the first working port is larger than or equal to the preset pressure value.

The hydraulic system comprises a hydraulic pump, an oil tank, a liquid filling valve group, an energy accumulator, a gear shifting brake system and a steering system, wherein the liquid inlet end of the hydraulic pump is connected with the oil tank, the liquid outlet end of the hydraulic pump is connected with the liquid filling valve group to provide hydraulic oil for the liquid filling valve group, a first working port and a second working port of the liquid filling valve group are respectively connected with the gear shifting brake system and the steering system, the pressure of the gear shifting brake system is kept through the energy accumulator to maintain the current gear, and under the condition that the pressure value of the first working port is smaller than a preset pressure value, a connecting oil circuit between the first inlet port and the second working port is disconnected until the pressure value is larger than the preset pressure value, namely, the hydraulic oil is preferentially provided for the gear shifting brake system to ensure the normal running of the paver, and the hydraulic system can simultaneously provide power for the gear shifting brake system and the, the whole hydraulic system is simple and low in cost.

In addition, the hydraulic system of the paver in the above embodiment provided by the present invention may also have the following additional technical features:

on the basis of the technical scheme, the liquid filling valve group further comprises: the first valve body is provided with a second inlet, a second outlet, a first pilot port and a second pilot port, the second inlet of the first valve body is connected with the first inlet of the first valve body, the first pilot port of the first valve body is connected with the first inlet of the liquid-filled valve group, and the second outlet of the first valve body is connected with the second working port of the liquid-filled valve group; the second valve body is provided with a third inlet, a third outlet and a third pilot port, the third inlet of the second valve body is connected with the first inlet of the liquid-filled valve group, the third outlet of the second valve body is connected with the second pilot port of the first valve body, the third pilot port of the second valve body is connected with the first working port of the liquid-filled valve group, and the third outlet of the second valve body is connected with the oil tank; when the pressure value is smaller than the preset pressure value, the oil passages of the second valve body and the first valve body are in a closed state, the connecting oil passage between the first inflow port and the second working port is disconnected, the second valve body and the first valve body are in a conducting state under the condition that the pressure value of the first working port is larger than or equal to the preset pressure value, and the connecting oil passage between the first inflow port and the second working port is communicated.

In the technical scheme, a third pilot port of a second valve body is connected with a first working port of a liquid filling valve group, namely, the pressure at the third pilot port is reduced along with the pressure of a gear shifting brake system, when the pressure of the gear shifting brake system is reduced to be below a preset pressure value, namely, the pressure is reduced to be below the working pressure of a third pilot port, a pilot flow path of the second valve body fails, the second valve body acts to cut off hydraulic oil flowing to the first pilot port, so that the first valve body acts to cut off the hydraulic oil flowing to a steering system, further, hydraulic oil is provided for the gear shifting brake system through the full force of a hydraulic pump, and after the pressure of the gear shifting brake system is restored to the preset pressure value, the second valve body and the first valve body are restored, further, the hydraulic control of the whole hydraulic system is realized, and the stability.

On the basis of any one of the above technical solutions, further, the liquid-filled valve group further includes: the check valve is arranged between the first inflow port of the liquid filling valve group and the first working port of the liquid filling valve group and is communicated from the first inflow port to the first working port.

In the technical scheme, the pressure oil of the gear shifting brake system is prevented from flowing back through the one-way valve, so that the normal operation of the gear shifting brake system is ensured.

On the basis of any one of the above technical solutions, further, the hydraulic system further includes: and the pressure switch is connected with the first working port of the liquid filling valve group.

In the technical scheme, the pressure switch is used for protecting the system, so that the overhigh pressure in the system is avoided.

On the basis of any one of the above technical solutions, further, the shift brake system includes: the gear shifting hydraulic cylinder is used for realizing gear shifting operation of a gearbox of the paver; the shifting hydraulic valve is provided with a fourth flow inlet, a fourth flow outlet, a third working port and a fourth working port, the fourth flow inlet of the shifting hydraulic valve is connected to a flow path between the energy accumulator and the liquid charging valve group, the third working port of the shifting hydraulic valve and the fourth working port of the shifting hydraulic valve are respectively connected with a rod cavity of the shifting hydraulic cylinder and a rodless cavity of the shifting hydraulic cylinder, and the fourth flow outlet of the shifting hydraulic valve is connected with an oil tank; and the first pressure reducing valve is connected between the fourth outlet of the gear shifting hydraulic valve and the rod cavity of the gear shifting hydraulic cylinder.

In the technical scheme, the gear shifting brake system comprises a gear shifting hydraulic cylinder which extends or contracts according to the action of a gear shifting hydraulic valve so as to realize the gear shifting operation of a gearbox of the paver.

On the basis of any one of the above technical solutions, further, the shift brake system further includes: the hydraulic service brake is used for realizing the braking of a gearbox of the paver; the running brake valve is provided with a fifth inlet, a fifth outlet, a fifth working port and a sixth working port, the fifth inlet of the running brake valve is connected to a flow path between the energy accumulator and the liquid charging valve group, the fifth working port of the running brake valve is connected with a running hydraulic brake, and the fifth outlet of the running brake valve is connected with an oil tank; and the second pressure reducing valve is connected between the fifth outlet of the service brake valve and the sixth working port of the service brake valve.

In the technical scheme, the gear shifting brake system comprises a service hydraulic brake, and the service brake of the paver is realized by extending or retracting according to the action of a service brake valve.

On the basis of any one of the above technical solutions, further, the shift brake system includes: the parking hydraulic brake is used for realizing the braking of the gearbox; the parking hydraulic valve is provided with a sixth inlet, a sixth outlet, a seventh working port and an eighth working port, the sixth inlet of the parking hydraulic valve is connected to a flow path between the energy accumulator and the liquid filling valve group, the seventh working port of the parking hydraulic valve is connected with the parking hydraulic brake, and the sixth outlet of the parking hydraulic valve is connected with the oil tank.

In the technical scheme, the gear shifting brake system comprises a parking hydraulic brake, and the parking brake of the paver is realized by extending or retracting according to the action of a parking brake valve.

On the basis of any one of the above technical solutions, further, the steering system includes: the steering hydraulic cylinder is used for realizing steering of the paver; the steering gear is provided with a first control oil port and an oil inlet, is connected with the steering hydraulic cylinder and is used for controlling the working state of the steering hydraulic cylinder; the priority valve is provided with a seventh flow inlet, a ninth working port, a second control oil port, a tenth working port and a seventh flow outlet, the seventh flow inlet of the priority valve is connected with the second working port of the liquid filling valve group, the second control oil port of the priority valve is connected with the first control oil port of the steering gear, the tenth working port of the priority valve is connected with the oil inlet of the steering gear, the ninth working port of the priority valve is connected with the oil tank, the seventh flow outlet of the priority valve is connected with the oil tank, when the steering gear works, the first control oil port of the steering gear feeds back a pressure signal to the second control oil port, the seventh flow inlet of the priority valve is communicated with the tenth working port of the priority valve, when the steering gear does not work, the first control oil port of the steering gear feeds back a pressure signal to the second control oil port, and the seventh flow inlet of the priority valve is communicated with the ninth working port of the priority valve.

In the technical scheme, a steering hydraulic cylinder, a steering gear and a priority valve form a complete steering system, so that the steering function of the paver is realized.

According to a second aspect of embodiments of the present invention, there is provided a paving machine comprising: the hydraulic system according to any one of the preceding claims.

The invention provides a paver, comprising: the hydraulic system according to any of the above-mentioned solutions, therefore, has all the advantages of the hydraulic system according to any of the above-mentioned solutions, and is not further described herein.

On the basis of the technical scheme, the paver further comprises: the hydraulic system of the paver is arranged on the machine body; the ironing system is arranged at one end of the machine body; the speed change system is arranged on the machine body, and the hydraulic system of the paver can control the speed change system; and the wheel system is connected with the speed change system to drive the wheel system to operate.

In the technical scheme, the hydraulic system of the paver is arranged on the machine body so as to control the speed change system and the wheel system to perform corresponding actions.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a hydraulic system according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a hydraulic system according to a second embodiment of the present invention;

FIG. 3 is a schematic diagram of a fill valve block of the hydraulic system of FIG. 2;

FIG. 4 is a schematic diagram of a shift hydraulic valve in the hydraulic system of FIG. 2;

FIG. 5 is a schematic diagram of a service brake valve of the hydraulic system of FIG. 2;

FIG. 6 is a schematic diagram illustrating a parking hydraulic valve in the hydraulic system of FIG. 2;

fig. 7 shows a schematic diagram of the configuration of the priority valve in the hydraulic system shown in fig. 2.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 7 is:

1 hydraulic system, 10 hydraulic pump, 20 charge valve set, 202 first inlet port, 204 first outlet port, 206 first working port, 208 second working port, 22 first valve body, 222 second inlet port, 224 second outlet port, 226 first pilot port, 228 second pilot port, 24 second valve body, 242 third inlet port, 244 third outlet port, 246 third pilot port, 26 check valve, 30 accumulator, 40 shift brake system, 42 shift hydraulic cylinder, 44 shift hydraulic valve, 442 fourth inlet port, 444 fourth outlet port, 446 third working port, 448 fourth working port, 46 first pressure reducing valve, 48 service hydraulic brake, 50 service brake valve, 502 fifth inlet port, 504 fifth outlet port, 506 fifth working port, 508 sixth working port, 52 second pressure reducing valve, 54 hydraulic brake, 56 hydraulic valve 562, parking port, 564 sixth outlet port, 566 seventh working port, 568 eighth port, 60 steering system, 62 steering cylinder, 64 steering gear, 66 priority valve, 662 seventh inlet port, 664 ninth port, 666 second control port, 668 tenth port, 670 seventh outlet port, 70 pressure switch, 80 tank, 2 gearbox.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Paving machine hydraulic systems and paving machines provided in accordance with some embodiments of the present disclosure are described below with reference to fig. 1-7.

As shown in fig. 1 and 2, according to an embodiment of the first aspect of the present invention, the present invention provides a hydraulic system 1 of a paver, including: a hydraulic pump 10; the oil tank 80 is connected with the liquid inlet end of the hydraulic pump 10; the hydraulic pump 10 comprises a liquid filling valve group 20, wherein the liquid filling valve group 20 is provided with a first inlet 202, a first outlet 204, a first working port 206 and a second working port 208, the first inlet 202 of the liquid filling valve group 20 is connected with the outlet of the hydraulic pump 10, the first inlet 202 of the liquid filling valve group 20 is connected with the first working port 206 of the liquid filling valve group 20, and the first outlet 204 of the liquid filling valve group 20 is connected with an oil tank 80; an accumulator 30 connected to the first working port 206 of the charge valve block 20; a shift brake system 40 connected to a flow path connecting the accumulator 30 to the first working port 206 of the charge valve block 20; a steering system 60 coupled to the second port 208 of the fill valve block 20; the connection oil path between the first inlet port 202 and the second working port 208 can be selectively connected and disconnected, the connection oil path between the first inlet port 202 and the second working port 208 is disconnected when the pressure value of the first working port 206 is smaller than the preset pressure value, and the connection oil path between the first inlet port 202 and the second working port 208 is connected when the pressure value of the first working port 206 is greater than or equal to the preset pressure value.

The invention provides a hydraulic system 1, which comprises a hydraulic pump 10, an oil tank 80, a liquid-filling valve group 20, an accumulator 30, a gear-shifting braking system 40 and a steering system 60, wherein the liquid inlet end of the hydraulic pump 10 is connected with the oil tank 80, the liquid outlet end of the hydraulic pump 10 is connected with the liquid-filling valve group 20 to provide hydraulic oil for the liquid-filling valve group 20, a first working port 206 and a second working port 208 of the liquid-filling valve group 20 are respectively connected with the gear-shifting braking system 40 and the steering system 60, the pressure of the gear-shifting braking system 40 is maintained through the accumulator 30, the current gear is maintained, and under the condition that the pressure value of the first working port 206 is smaller than the preset pressure value, a connecting oil circuit between the first inlet port 202 and the second working port 208 is disconnected until the pressure value is larger than the preset pressure value, namely the hydraulic oil is preferentially provided for the gear-shifting braking system 40 to ensure the normal running of a paver, the hydraulic system 1 can simultaneously provide power, the overall hydraulic system 1 is simple and low in cost.

In one embodiment of the present invention, as shown in fig. 2 and 3, the liquid-filled valve set 20 further includes: the first valve body 22, the first valve body 22 has a second inlet 222, a second outlet 224, a first pilot port 226 and a second pilot port 228, the second inlet 222 of the first valve body 22 is connected to the first inlet 202 of the first valve body 22, the first pilot port 226 of the first valve body 22 is connected to the first inlet 202 of the filling valve block 20, and the second outlet 224 of the first valve body 22 is connected to the second working port 208 of the filling valve block 20; a second valve body 24, the second valve body 24 having a third inlet 242, a third outlet 244 and a third pilot port 246, the third inlet 242 of the second valve body 24 being connected to the first inlet 202 of the filling valve set 20, the third outlet 244 of the second valve body 24 being connected to the second pilot port 228 of the first valve body 22, the third pilot port 246 of the second valve body 24 being connected to the first working port 206 of the filling valve set 20, and the third outlet 244 of the second valve body 24 being connected to the tank 80; when the pressure value is smaller than the preset pressure value, the oil passages of the second valve body 24 and the first valve body 22 are in a closed state, the connection oil passage between the first inlet port 202 and the second working port 208 is disconnected, and when the pressure value of the first working port 206 is greater than or equal to the preset pressure value, the second valve body 24 and the first valve body 22 are in a conducting state, and the connection oil passage between the first inlet port 202 and the second working port 208 is communicated.

In this embodiment, the third pilot port 246 of the second valve body 24 is connected to the first working port 206 of the liquid charging valve set 20, that is, the pressure at the third pilot port 246 decreases with the pressure of the shift brake system 40, when the pressure of the shift brake system 40 decreases below a predetermined pressure value, that is, the pressure decreases below the working pressure of the third pilot port 246, the pilot flow path of the second valve body 24 fails, the second valve body 24 operates to cut off the hydraulic oil flowing to the first pilot port 226, and further the first valve body 22 operates to cut off the hydraulic oil flowing to the steering system 60, and further the hydraulic pump 10 fully supplies the hydraulic oil to the shift brake system 40, and after the pressure of the shift brake system 40 returns to the predetermined pressure value, the second valve body 24 and the first valve body 22 return to each other, and thus the hydraulic control of the entire hydraulic system 1 is realized, and the stability is high.

In an embodiment of the present invention, as shown in fig. 2 and 3, the liquid filling valve set 20 further includes: the check valve 26 is disposed between the first inlet port 202 of the charging valve block 20 and the first working port 206 of the charging valve block 20, and is communicated from the first inlet port 202 to the first working port 206.

In this embodiment, the return flow of pressurized oil of the shift brake system 40 is prevented by the check valve 26 to ensure proper operation of the shift brake system 40.

Specifically, the charging valve block 20 includes: the hydraulic manifold block, with first valve body 22, second valve body 24 and check valve 26 that set up on the manifold block, set up the runner that communicates first inlet 202 and first working port 206 on the hydraulic manifold block, third inlet 242 is linked together with the runner, third leading port 246 is linked together with the runner, check valve 26 sets up between the tie point of third inlet 242 and runner and the tie point of third leading port 246 and runner, wherein, second valve body 24 still is equipped with the backward flow mouth, the backward flow mouth is linked together with first outlet 204.

In one embodiment of the present invention, further, the hydraulic system 1 further includes: the pressure switch 70 is connected to the first port 206 of the fill valve block 20.

In this embodiment, the pressure switch 70 provides protection for the system, and when the pressure in the shift brake system 40 reaches the trigger pressure of the pressure switch 70, the pressure switch 70 triggers to avoid excessive pressure in the system.

In an embodiment of the present invention, further, as shown in fig. 1, fig. 2 and fig. 4, the shift brake system 40 includes: the gear shifting hydraulic cylinder 42 is used for realizing gear shifting operation of the gearbox 2 of the paver; a shift hydraulic valve 44, wherein the shift hydraulic valve 44 has a fourth inlet 442, a fourth outlet 444, a third working port 446 and a fourth working port 448, the fourth inlet 442 of the shift hydraulic valve 44 is connected to the flow path between the accumulator 30 and the charge valve group 20, the third working port 446 of the shift hydraulic valve 44 and the fourth working port 448 of the shift hydraulic valve 44 are respectively connected to the rod chamber of the shift hydraulic cylinder 42 and the rodless chamber of the shift hydraulic cylinder 42, and the fourth outlet 444 of the shift hydraulic valve 44 is connected to the oil tank 80; a first relief valve 46 is connected between the fourth outlet 444 of the shift hydraulic valve 44 and the rod cavity of the shift hydraulic cylinder 42.

In this embodiment, the shift brake system 40 includes a shift hydraulic cylinder 42, a shift hydraulic valve 44, and a first pressure reducing valve 46, wherein the shift hydraulic valve 44 is a three-position, four-way hydraulic valve including: a first state in which the fourth inlet port 442 communicates with the third working port 446, and the fourth outlet port 444 communicates with the fourth working port 448; a second state in which the fourth inlet 442 communicates with the fourth working port 448 and the fourth outlet 444 communicates with the third working port 446; a third state in which the fourth outlet 444, the fourth working port 448 and the third working port 446 are communicated with each other. When the shift hydraulic valve 44 is not energized, the shift hydraulic valve 44 is in a third state; when the shifting hydraulic valve 44 is electrified, the shifting hydraulic valve 44 is in a first state or a second state, and then the shifting hydraulic cylinder 42 is controlled to extend or contract, so that the shifting operation of the gearbox 2 of the paver is realized.

In an embodiment of the present invention, further, as shown in fig. 1, fig. 2 and fig. 5, the shift brake system 40 further includes: the service hydraulic brake 48 is used for realizing the braking of the gearbox 2 of the paver; a service brake valve 50, wherein the service brake valve 50 has a fifth inlet port 502, a fifth outlet port 504, a fifth working port 506 and a sixth working port 508, the fifth inlet port 502 of the service brake valve 50 is connected to a flow path between the accumulator 30 and the charging valve set 20, the fifth working port 506 of the service brake valve 50 is connected to the service hydraulic brake 48, and the fifth outlet port 504 of the service brake valve 50 is connected to the oil tank 80; and a second pressure reducing valve 52 connected between the fifth outlet port 504 of the service brake valve 50 and a sixth working port 508 of the service brake valve 50.

In this embodiment, the shift brake system 40 includes the service hydraulic brake 48 and the service brake valve 50, wherein the service brake valve 50 is a two-position, four-way valve including a first state in which the fifth inlet port 502 is in communication with the fifth working port 506, and the fifth outlet port 504 is in communication with the sixth working port 508; the fifth inlet port 502 communicates with the sixth working port 508, and the fifth outlet port 504 communicates with the fifth working port 506. The service hydraulic brake 48 extends or retracts according to the working state of the service brake valve 50, so that the service brake of the paver is realized.

In an embodiment of the present invention, further, as shown in fig. 1, fig. 2 and fig. 6, the shift brake system 40 includes: a parking hydraulic brake 54 for effecting braking of the gearbox 2; the parking hydraulic valve 56 has a sixth inlet 562, a sixth outlet 564, a seventh working port 566, and an eighth working port 568, the sixth inlet 562 of the parking hydraulic valve 56 is connected to a flow path between the accumulator 30 and the charge valve group 20, the seventh working port 566 of the parking hydraulic valve 56 is connected to the parking hydraulic brake 54, and the sixth outlet 564 of the parking hydraulic valve 56 is connected to the oil tank 80.

In this embodiment, the shift brake system 40 includes the parking hydraulic brake 54, the parking brake valve and the second pressure reducing valve 52, wherein the parking brake valve is a two-position four-way valve including a first state in which the sixth inlet 562 is in communication with the seventh working port 566, and the sixth outlet 564 is in communication with the eighth working port 568; a second state in which the sixth inlet 562 communicates with the eighth working port 568 and the sixth outlet 564 communicates with the seventh working port 566. And the parking hydraulic brake 54 extends or retracts according to the working state of the parking brake valve, so that the parking brake of the paver is realized.

In an embodiment of the present invention, further, as shown in fig. 1, 2 and 7, the steering system 60 includes: the steering hydraulic cylinder 62 is used for realizing steering of the paver; the steering gear 64 is provided with a first control oil port and an oil inlet, is connected with the steering hydraulic cylinder 62 and is used for controlling the working state of the steering hydraulic cylinder 62; a priority valve 66, which has a seventh inlet 662, a ninth working port 664, a second control port 666, a tenth working port 668 and a seventh outlet 670, wherein the seventh inlet 662 of the priority valve 66 is connected to the second working port 208 of the charge valve block 20, the second control port 666 of the priority valve 66 is connected to the first control port of the diverter 64, the tenth working port 668 of the priority valve 66 is connected to the oil inlet of the diverter 64, the ninth working port 664 of the priority valve 66 is connected to the oil tank 80, the seventh outlet 670 of the priority valve 66 is connected to the oil tank 80, when the diverter 64 is operated, the first control port of the diverter 64 feeds back a pressure signal to the second control port 666, the seventh inlet of the priority valve 66 is connected to the tenth working port 668 of the priority valve 66, when the diverter 64 is not operated, the first control no pressure signal of the diverter 64 is fed back to the second control port 666, the seventh inlet port 662 of the priority valve 66 communicates with the ninth working port 664 of the priority valve 66.

In this embodiment, steering hydraulic cylinder 62, steering gear 64 and priority valve 66 form a complete steering system 60, thereby implementing the steering function of the paving machine.

According to a second aspect of embodiments of the present invention, there is provided a paving machine comprising: a hydraulic system 1 as in any one of the embodiments described above.

The invention provides a paver, comprising: the hydraulic system 1 according to any of the embodiments described above, therefore, has all the advantages of the hydraulic system 1 according to any of the embodiments described above, and will not be described herein.

In one embodiment of the present invention, further, the paving machine further includes: the paver hydraulic system 1 is arranged on the paver body; the ironing system is arranged at one end of the machine body; the speed change system is arranged on the machine body, and the paver hydraulic system 1 can control the speed change system; and the wheel system is connected with the speed change system to drive the wheel system to operate.

In this embodiment, the paver hydraulic system 1 is provided in the fuselage to control the gear system and the wheel system to perform corresponding actions.

In a specific embodiment, as shown in fig. 1-7, the gear pump (hydraulic pump 10) provides a system oil source, which feeds the charge valve bank 20 and the accumulator 30, and the accumulator 30 and the charge valve bank 20 are responsible for maintaining the pressure level of the accumulator 30 circuit at a certain limit value, and if the pressure generated by the downstream component (N port, i.e., the second working port 208) is higher than the cut-off pressure of the accumulator 30 charge valve bank 20 (the pilot pressure of the second valve body 24), the pressure of the accumulator 30 circuit will increase to that pressure level. During filling, the gear pump charges the accumulator 30 with pressurized oil via the non-return valve 26 in the filling valve block 20, for which purpose the pressure is applied to the load signal side of the pressure compensator via the pilot line and the pilot control. This pressure compensation closes the N port, pressurized oil is throttled and charged to the accumulator 30 system, and the pilot control switches the load signal line of the pressure compensator from B1 (first working port 206) to T (first outlet port 204) again when the pressure reaches the preset pressure value of the charge valve block 20. Then the pressure oil of the gear pump is communicated with the N port through the P port, and the liquid filling process is completed.

The accumulator 30 serves as an oil source for supplying functional elements such as high-speed and low-speed switching, parking braking, service braking and the like.

When the paver stops, the parking hydraulic valve 56 is powered off, the brake friction plate inside the gearbox 2 is locked under the action of spring force, and the whole vehicle cannot walk. When the paver walks, after the parking hydraulic valve 56 is electrified, the pressure oil opens the brake friction plate inside the gearbox 2, and the parking brake is finished.

When the paver runs, if a barrier or an emergency exists in the front, a running brake pedal is stepped, the brake pedal triggers a running brake signal, a running hydraulic valve is electrified, pressure oil is introduced into a wheel-side running brake, specifically, the running brake is a running drum brake, a friction plate generates brake force to stop the whole vehicle from running, and the running hydraulic valve is used for presetting the running brake pressure.

When the paver shifts gears, the shift hydraulic valve 44 is electrified, and pressure oil controls the shift hydraulic cylinder 42 in the gearbox 2, so that the internal meshing gear of the gearbox 2 is switched, and the gear shifting operation is realized.

The N port pressure oil of the charging valve group 20 supplies to the steering system 60, which is connected with the P port (seventh inlet port 662) of the steering priority valve 66, the CF port (second control oil port 666) of the steering priority valve 66 is connected with the P port (first control oil port) of the steering gear 64, the LS port (tenth working port 668) of the priority valve 66 is connected with the LS port (oil outlet) of the steering gear 64, when the whole steering machine performs steering action, the pressure of the steering system 60 transmits a pressure signal to the LS port of the priority valve 66 through the LS port of the steering gear 64, the system builds pressure to realize the steering action, when the whole steering machine performs no steering action, the LS of the priority valve 66 does not have load pressure feedback, and the P port pressure oil of the priority valve 66 returns to the tank through the EF port (ninth working port 664) of the priority valve 66.

In the present invention, the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.