CN108442213B - Multifunctional control system of paver screed - Google Patents

Abstract

The invention discloses a multifunctional control system for a paver screed. The hydraulic control system includes a two-position four-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve, a one-way throttle valve, a reversing reducer Pressure valve one, reversing pressure reducing valve two, two-position four-way electromagnetic reversing valve two, hydraulic valve block and solenoid valve one and solenoid valve two installed in the rod cavity of the left and right lifting cylinders. The control system of the present invention can not only realize the functions of raising, lowering, floating, locking, power-assisting and anti-climbing of the paver screed; but also in terms of controlling the power-assisting function of the screed, it can realize simultaneous power-assisting of the left and right lifting cylinders as needed. , or independent power control, which can effectively solve problems such as bulges or indentations on the road surface.

Description

Multifunction control system for paver screeds

Technical field

The present invention relates to a paver control system, specifically a multifunctional control system for a paver screed.

Background technique

In road construction and maintenance construction, paver, as one of the important construction equipment, is mainly used for paving stabilized soil materials or asphalt concrete materials in the base and surface layers of high-grade highways. As the main working device of the paver, the screed plays a vital role in the paving quality of the road throughout the entire paving operation. According to the construction requirements of paving operations, the control of the screed is generally achieved through the hydraulic system of the lifting cylinder, including functions such as rising, falling, floating, locking, and boosting. At present, most control of screed functions only pursues the realization of individual functions and requires an additional hydraulic circuit for control, which not only makes the hydraulic circuit complex but also cannot meet the requirements of special construction operations. For example, the power assist function can only assist the lifting cylinders on the left and right sides at the same time, but cannot control the power assist independently. This makes it impossible to pave roads with transverse slopes.

The paving process of a paver generally includes three stages: parking, starting and paving. During the process of parking and starting of the paver, the stress state of the screed will change. If the control of the screed at this time Improper handling will cause pavement defects such as bulges or indentations on the road surface. In order to solve this problem, most screeds currently lock the lifting cylinder during the parking and starting process of the paver to avoid displacement of the screed. However, when the lifting cylinder is locked for a short time, the upper cavity of the lifting cylinder will be sucked in to form a negative pressure. Afterwards, the screed will be displaced upward due to the support force of the bottom material, causing bulging on the road surface and affecting the road quality.

The Chinese invention patent application number 2014108247568 disclosed a hydraulic control device for the paver screed on December 27, 2014. Although the hydraulic control device avoids the safety hazard caused by the screed falling too fast due to operating errors. To solve the problem of hidden dangers, the screed can also be raised, lowered, floated and locked. However, due to the influence of the throttle valve, the "complete floating" of the screed during the paving process cannot be achieved, which affects the paving quality of the road and cannot realize the power-assisting function of the screed. As before, there is still no fundamental solution to the problems such as bulges or indentations caused by the paver during the parking and starting stages.

The Chinese utility model patent application number 2015206998581 disclosed a hydraulic control system and paver on September 11, 2015. Although the hydraulic control system avoids the vacuum phenomenon caused by the upper chamber of the lifting cylinder during the locking process, It can also realize the functions of raising, lowering, floating, locking and assisting the screed. However, during the screed floating process, the screed cannot enter the "completely floating" state due to the back pressure in the upper and lower chambers of the lifting cylinder. In addition, in terms of the control of the power assist function, only the left and right lifting cylinders can be assisted simultaneously, not individually. for power assist control.

Contents of the invention

In view of the shortcomings of the above-mentioned existing technologies, the present invention provides a multi-functional control system for the paver screed. The control system can realize the functions of rising, lowering, floating, locking, power-assisting and anti-climbing of the paver screed. ;Further, in the control of the screed power-assist function, the left and right lifting cylinders can be assisted simultaneously or independently, as needed; Further, a method of controlling the screed during the parking and starting stages of the paver is proposed. This method can effectively solve problems such as bulges or indentations on the road surface.

In order to achieve the above objects, the technical solution adopted by the present invention is: a multi-functional control system for the paver screed, including a hydraulic control system;

The hydraulic control system includes a two-position four-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve, a one-way throttle valve, a reversing pressure reducing valve, a two-position four-way reversing pressure reducing valve, and a two-position four-way electromagnetic reversing valve. Electromagnetic reversing valve 2, hydraulic valve block and solenoid valve 1 and 2 are respectively installed on the rod cavity of the left lifting cylinder and the rod cavity of the right lifting cylinder. The hydraulic valve block includes a main oil circuit, a return oil circuit and a flow valve. The flow valve divides the main oil circuit into two pressure oil circuits Pc and Pd, and are connected to the pressure measuring interfaces M2 and M3 of the hydraulic valve block respectively.

The high-pressure port P1 and the oil return port T1 of the two-position four-way electromagnetic directional valve 1 are respectively connected to the main oil circuit Pa and the first return oil circuit Ta of the hydraulic valve block, and the two control ports A1 and B1 are respectively connected with The second oil return line Tb of the hydraulic valve block and the pressure measuring interface M1 are connected;

The high-pressure port P2 and the oil return port T2 of the three-position four-way electromagnetic reversing valve are respectively connected to the first pressure oil path Pe of the flow valve and the third return oil path Tc of the hydraulic valve block, and the two control ports A2 , B2 are respectively connected to the first oil outlet Aa and the second oil outlet Ba of the hydraulic valve block; the one-way throttle valve is connected in series between the control port B2 of the three-position four-way electromagnetic reversing valve one and the hydraulic valve Between the second oil outlet of the block and the oil circuit;

The reversing pressure reducing valve one includes a three-position four-way electromagnetic reversing valve two and a pressure reducing check valve one. The high-pressure port P3 and oil return port T3 of the three-position four-way electromagnetic reversing valve two are respectively connected with the other part of the flow valve. One pressure oil circuit Pf and the fourth return oil circuit Td of the hydraulic valve block are connected, and one control port A3 and the pressure reducing one-way valve are connected in series and connected to the outlet Ac of the one-way throttle valve, and the other Control port B3 is blocked on the hydraulic valve block;

The reversing pressure reducing valve two includes a three-position four-way electromagnetic reversing valve three and a pressure reducing check valve two. The high-pressure port P4 and oil return port T4 of the three-position four-way electromagnetic reversing valve three are respectively connected with the other part of the flow valve. A pressure oil circuit Ps is connected to the fifth return oil circuit Te of the hydraulic valve block, and a control port A4 is connected in series with the pressure reducing check valve 2 and is connected to the oil return port of the two-position four-way electromagnetic reversing valve 2. T5 is connected; the other control port B4 is blocked on the hydraulic valve block;

The high-pressure port P5 of the two-position four-way electromagnetic reversing valve 2 is connected to the outlet Ac of the one-way throttle valve, and one control port A5 is connected to the third oil outlet Ab of the hydraulic valve block, and the other control port B5 blocks the hydraulic valve block;

The hydraulic valve block also includes a relief valve one, a solenoid valve three, a solenoid valve four, a relief valve two and a relief valve three. The relief valve one is connected in parallel to a pressure oil circuit Pd of the flow valve and the hydraulic valve. between the fourth oil return path Td of the block; the two overflow valves are connected in parallel between the control port A2 of the three-position four-way electromagnetic reversing valve one and the third oil return path Tc of the hydraulic valve block; The flow valve three is connected in parallel between the control port B1 of the two-position four-way electromagnetic reversing valve one and the first return oil path Ta of the hydraulic valve block; the solenoid valve three is connected in parallel between the outlet of the one-way throttle valve and the three between the control port A2 of the four-way solenoid valve one; the solenoid valve four is connected in series between the inlet of the relief valve two and the first oil outlet Aa of the hydraulic valve block;

The first oil outlet Aa of the hydraulic valve block is connected to the rodless chambers of the left lifting cylinder and the right lifting cylinder respectively;

The second oil outlet Ba of the hydraulic valve block and the second solenoid valve are connected in series and then connected to the rod cavity of the right lifting cylinder;

The third oil outlet Ab of the hydraulic valve block and the solenoid valve are connected in series and then connected to the rod cavity of the left lifting cylinder.

It also includes a left lifting cylinder pressure sensor and a right lifting cylinder pressure sensor;

The left lifting cylinder pressure sensor is installed on the rod cavity of the left lifting cylinder;

The pressure sensor of the right lifting cylinder is installed on the rod cavity of the right lifting cylinder;

It also includes a left lifting cylinder displacement sensor and a right lifting cylinder displacement sensor;

The left lifting cylinder displacement sensor is installed on the piston rod of the left lifting cylinder;

The right lifting cylinder displacement sensor is installed on the piston rod of the right lifting cylinder.

Preferably, the median functions of the two-position four-way electromagnetic reversing valve one and the two-position four-way electromagnetic reversing valve two are type II;

Preferably, the median function of the three-position four-way electromagnetic reversing valve 1 is K-type;

Preferably, the median functions of the three-position four-way electromagnetic reversing valve two and the three-position four-way electromagnetic reversing valve three are Y-shaped;

Preferably, the pressure adjustment of the reversing pressure reducing valve one and the reversing pressure reducing valve two is electrically proportional;

In order to control the hydraulic control system, an electrical control system is also included. The electrical control system includes a console, a controller, a left lifting cylinder pressure sensor, a right lifting cylinder pressure sensor, and a left lifting cylinder connected to the input end of the controller. Oil cylinder displacement sensor, right lifting oil cylinder displacement sensor; the electrical control system also includes an interface corresponding to the solenoid valve in the hydraulic control system connected to the output end of the controller, including one interface for a two-position four-way electromagnetic reversing valve and a three-position four-way electromagnetic reversing valve One interface of the solenoid directional valve, two interfaces of the three-position four-way solenoid valve, three interfaces of the three-position four-way solenoid valve, two interfaces of the two-position four-way solenoid valve, one interface of the solenoid valve, two interfaces of the solenoid valve , solenoid valve three interfaces and solenoid valve four interfaces;

The invention also provides a method for controlling the screed of the paver during the parking and starting stages, which includes the following steps:

1) The operator triggers the parking command through the console, and the controller immediately issues an anti-climb function command to the hydraulic control system to implement anti-climb function control on the screed;

2) The left lifting cylinder displacement sensor and the right lifting cylinder displacement sensor monitor the screed displacement in real time. When the displacement detection value is greater than the paving thickness measurement value before parking, the controller issues a locking function instruction to the hydraulic control system to lock the screed. Function control; otherwise, continue to control the anti-climbing function of the screed;

3) After parking, until the operator triggers the starting command through the console, the controller delays for a set time and issues a floating function command to the hydraulic control system to implement floating function control on the screed;

4) The left lifting cylinder displacement sensor and the right lifting cylinder displacement sensor monitor the screed displacement in real time. When the displacement detection value is less than the paving thickness measurement value before parking, the controller issues a power-assist function command to the hydraulic control system to assist the screed. Function control, and the controller can detect the assist pressure of the screed based on the pressure sensor of the left lifting cylinder and the pressure sensor of the right lifting cylinder, and adjust the assist pressure in real time through the hydraulic control system according to the displacement changes of the left and right lifting cylinders, thereby reducing the need for ironing. The influence of the gravity of the screed will allow the screed to quickly enter the "floating state"; otherwise, the screed will continue to be controlled by the floating function.

Compared with the existing technology, the advantages and positive effects of the present invention are:

The multi-functional control system of the paver screed can not only realize the functions of raising, lowering, floating, locking, assisting and anti-climbing the paver screed; but also in terms of controlling the screed assist function, it can realize left and right functions as needed. The lifting cylinders on both sides can assist simultaneously or independently. On this basis, a method of controlling the screed of the paver during the parking and starting stages is proposed, which can effectively solve problems such as bulges or indentations on the road surface.

Description of the drawings

Figure 1: is a schematic diagram of the hydraulic control system of the present invention;

In the picture: 1. One two-position four-way solenoid directional valve, 2. One three-position four-way solenoid directional valve, 3. One-way throttle valve,

4. Reversing pressure reducing valve one, 4.1, three-position four-way electromagnetic reversing valve two, 4.2, pressure reducing one-way valve one,

5. Reversing pressure reducing valve two, 5.1, three-position four-way electromagnetic reversing valve three, 5.2, pressure reducing one-way valve two,

6. Two-position four-way solenoid valve two, 7. Hydraulic valve block, 7.1, relief valve one, 7.2, solenoid valve three,

7.3. Solenoid valve four, 7.4. Relief valve two, 7.5. Flow valve, 7.6. Relief valve three,

8. Left lifting cylinder, 8.1. Left lifting cylinder pressure sensor, 8.2. Left lifting cylinder displacement sensor, 9. Right lifting cylinder, 9.1. Right lifting cylinder pressure sensor, 9.2. Right lifting cylinder displacement sensor, 10. Solenoid valve one, 11. Solenoid valve two,

Figure 2: is a structural block diagram of the electrical control system of the present invention;

Figure 3 is a flow chart of a method for controlling the screed of a paver in the parking and starting stages of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Multifunctional control system for paver screed, including hydraulic control system and electrical control system;

As shown in Figure 1, the hydraulic control system includes a two-position four-way electromagnetic reversing valve - 1, a three-position four-way electromagnetic reversing valve - 2, a one-way throttle valve 3, a reversing pressure reducing valve - 4, a reversing reducer Pressure valve two 5, two-position four-way electromagnetic reversing valve two 6, hydraulic valve block 7 and solenoid valve one 10 with rod cavity installed in the left lifting cylinder 8 and solenoid valve two 11 with rod cavity installed in the right lifting cylinder 9 . The hydraulic valve block 7 includes a main oil circuit P, a return oil circuit T, and a flow valve 7.5. The flow valve 7.5 divides the main oil circuit P into two pressure oil circuits Pc and Pd, and are connected to the pressure measurement of the hydraulic valve block 7 respectively. Interfaces M2 and M3 are connected.

The high-pressure port P1 and the oil return port T1 of the two-position four-way electromagnetic directional valve 1 are respectively connected to the main oil circuit Pa and the return oil circuit Ta of the hydraulic valve block 7, and the two control ports A1 and B1 are respectively connected with The oil return path Tb of the hydraulic valve block 7 and the pressure measuring interface M1 are connected;

The high-pressure port P2 and the oil return port T2 of the three-position four-way electromagnetic reversing valve 2 are respectively connected to a pressure oil path Pe of the flow valve 7.5 and the return oil path Tc of the hydraulic valve block 7, and the two control ports A2 and B2 are respectively connected to the oil outlet Aa and the oil outlet Ba of the hydraulic valve block 7; the one-way throttle valve 3 is connected in series between the control port B2 of the three-position four-way electromagnetic reversing valve-2 and the hydraulic valve Between the oil outlet and oil circuit of block 7;

The reversing pressure reducing valve one 4 includes a three-position four-way electromagnetic reversing valve two 4.1 and a pressure reducing check valve one 4.2. The high-pressure port P3 and oil return port T3 of the three-position four-way electromagnetic reversing valve two 4.1 are respectively Another pressure oil path Pf of the flow valve 7.5 is connected to the return oil path Td of the hydraulic valve block 7, and a control port A3 and a pressure reducing check valve 4.2 are connected in series with the outlet of the one-way throttle valve 3 Ac is connected, and the other control port B3 is blocked on the hydraulic valve block 7;

The reversing and pressure reducing valve 25 includes a three-position four-way electromagnetic reversing valve three 5.1 and a pressure reducing check valve two 5.2. The high-pressure port P4 and oil return port T4 of the three-position four-way electromagnetic reversing valve three 5.1 are respectively The other pressure oil circuit Ps of the flow valve 7.5 is connected to the return oil circuit Te of the hydraulic valve block 7, and a control port A4 and the pressure reducing check valve 2 5.2 are connected in series with the two-position four-way electromagnetic reversing valve. The oil return port T5 of the second port 6 is connected; the other control port B4 is blocked on the hydraulic valve block 7;

The high-pressure port P5 of the two-position four-way electromagnetic reversing valve 26 is connected to the outlet Ac of the one-way throttle valve 3, and one control port A5 is connected to the oil outlet Ab of the hydraulic valve block 7, and the other control port A5 is connected to the oil outlet Ab of the hydraulic valve block 7. Port B5 is blocked on hydraulic valve block 7;

The hydraulic valve block 7 also includes a relief valve one 7.1, a solenoid valve three 7.2, a solenoid valve four 7.3, a relief valve two 7.4 and a relief valve three 7.6. The relief valve one 7.1 is connected in parallel to the flow valve 7.5. Between the pressure oil line Pd and the return oil line Td of the hydraulic valve block 7; the relief valve 7.4 is connected in parallel between the control port A2 of the three-position four-way electromagnetic reversing valve 2 and the return oil of the hydraulic valve block 7 The relief valve three 7.6 is connected in parallel between the control port B1 of the two-position four-way electromagnetic reversing valve one 1 and the oil return path Ta of the hydraulic valve block 7; the solenoid valve three 7.2 is connected in parallel Between the outlet of the one-way throttle valve 3 and the control port A2 of the three-position four-way electromagnetic reversing valve one 2; the solenoid valve four 7.3 is connected in series between the inlet of the relief valve two 7.4 and the outlet of the hydraulic valve block 7 Between oil ports Aa;

The oil outlet Aa of the hydraulic valve block 7 is connected to the rodless chambers of the left lifting cylinder 8 and the right lifting cylinder 9 respectively;

The oil outlet Ba of the hydraulic valve block 7 and the solenoid valve 2 11 are connected in series and then connected to the rod cavity of the right lifting cylinder 9;

The oil outlet Ab of the hydraulic valve block 7 and the solenoid valve 10 are connected in series and then connected to the rod cavity of the left lifting cylinder 8;

Preferably, the middle position function of the two-position four-way electromagnetic reversing valve 1 is type II. When the power is not energized, the main oil path P and the return oil path T in the hydraulic system can be connected to unload the system pressure. ; The middle position function of the two-position four-way electromagnetic reversing valve 26 is also type II. When the power is not energized, the rod cavity oil circuits of the left lifting cylinder 8 and the right lifting cylinder 9 can be connected;

Preferably, the middle position function of the three-position four-way electromagnetic reversing valve 2 is K-type. When no power is supplied, the rodless chamber oil circuits of the left lifting cylinder 8 and the right lifting cylinder 9 can be connected to the hydraulic valve block 7 at the same time. The oil return line T is connected;

Preferably, the median functions of the three-position four-way electromagnetic reversing valve 2 4.1 and the three-position four-way electromagnetic reversing valve 3 5.1 are Y-shaped. When power is not supplied, the three-position four-way electromagnetic reversing valve 2 4.1 can be The two control ports of the three-position four-way electromagnetic reversing valve three 5.1 are connected with the return oil path T of the hydraulic valve block 7, so that the reversing pressure reducing valve one 4 and the reversing pressure reducing valve two 5 are inactive;

The pressure adjustment of the reversing pressure reducing valve 14 and the reversing pressure reducing valve 25 is an electric proportional adjustment, which can be used to adjust the assist pressure of the rod cavity of the left lifting cylinder 8 and the assist pressure of the rodless cavity of the right lifting cylinder 9;

As shown in Figure 2, the electrical control system includes a console, a controller, a left lifting cylinder pressure sensor, a right lifting cylinder pressure sensor, a left lifting cylinder displacement sensor, and a right lifting cylinder displacement sensor connected to the input end of the controller; and The interfaces corresponding to the solenoid valves in the hydraulic control system connected to the output end of the controller include the interface Y1.1 of the two-position four-way solenoid valve -1, the interface Y2.1 of the three-position four-way solenoid valve -2 and Y3.1, the interface Y4.1 of the three-position four-way solenoid valve 2 4.1, the interface Y5.1 of the three-position four-way solenoid valve 3 5.1, the interface Y6.1 of the two-position four-way solenoid valve 2 6 , the interface Y9.1 of solenoid valve one 10, the interface Y10.1 of solenoid valve two 11, the interface Y7.2.1 of solenoid valve three 7.2 and the interface Y7.3.1 of solenoid valve four 7.3;

The left lifting cylinder pressure sensor 8.1 is installed in the rod cavity of the left lifting cylinder 8, the right lifting cylinder pressure sensor 9.1 is installed in the rod cavity of the right lifting cylinder 9; the left lifting cylinder displacement sensor 8.2 is installed in the piston rod of the left lifting cylinder 8 Above, the right lifting cylinder displacement sensor 9.2 is installed on the piston rod of the right lifting cylinder 9;

The multifunctional control system of the paver screed of the present invention can realize the following functional control of the paver screed, which will be described in detail with reference to Figure 1:

When the paver screed implements the lifting function, the electromagnet Y1 of the two-position four-way electromagnetic reversing valve one 1, the electromagnet Y2 of the three-position four-way electromagnetic reversing valve one 2 and the electromagnet Y7 of the solenoid valve four 7.2 energized, the other electromagnets Y3, Y4, Y5, Y6, Y8, Y9, and Y10 are all powered off. At this time, the main oil circuit P of the hydraulic valve block 7 flows from the Pb, Pc, and Pe ports through the three-position four-way electromagnetic commutation The high-pressure port P2 and control port B2 of valve one 2 are then divided into two paths through the one-way valve channel of one-way throttle valve 3, and flow through the high-pressure port P5 and control port A5 of two-position four-way electromagnetic reversing valve two 6. , flows out from the outlet Ab of the hydraulic valve block 7 and leads to the solenoid valve 10 installed on the rod cavity of the left lifting cylinder 8 to the rod cavity of the left lifting cylinder 8; the other flow flows out from the oil outlet Ba of the hydraulic valve block 7 Connect the solenoid valve 211 installed on the rod cavity of the right lifting cylinder 9 to the rod cavity of the right lifting cylinder 9, and lift the left and right lifting cylinders 8 and 9. At this time, the pressure of the system is limited by the relief valve 37.6 and can be measured through the pressure measuring interface M1 in the hydraulic valve block 7.

When the paver screed implements the lowering function, the electromagnet Y1 of the two-position four-way electromagnetic reversing valve one 1, the electromagnet Y3 of the three-position four-way electromagnetic reversing valve one 2, and the electromagnet Y7 of the solenoid valve four 7.2 , the electromagnet Y9 of solenoid valve one 10 and the electromagnet Y10 of solenoid valve two 11 are energized, and the other electromagnets Y2, Y4, Y5, Y6, and Y8 are all powered off. At this time, the main oil circuit P of the hydraulic valve block 7 starts from Pb , Pc, and Pe ports flow through the high-pressure port P2 port and control port A2 of the three-position four-way solenoid valve one 2, pass through the solenoid valve four 7.3, and flow out from the oil outlet Aa of the hydraulic valve block 7 into the left and right lifting The rodless chambers of cylinders 8 and 9 make the left and right lifting cylinders descend; and the oil in the rod chamber of left lifting cylinder 8 passes through solenoid valve 10, the oil outlet Ab of hydraulic valve block 7 and the two-position four-way solenoid exchanger. The control port A5 and high-pressure port P5 of directional valve 2 6 go to the one-way throttle valve 3, and the oil in the rod cavity of the right lifting cylinder 9 passes through the solenoid valve 2 11 and the oil outlet Ba of the hydraulic valve block 7 to the one-way throttle valve 3. Throttle valve 3. At this time, the oil in the rod chambers of the left and right lifting cylinders 8 and 9 flows through the throttle channel of the one-way throttle valve 3, and passes through the control port B2 of the three-position four-way electromagnetic reversing valve 1-2. , the oil return port T2 returns to the oil return path T of the hydraulic valve block 7. At this time, the descending pressure of the lifting cylinder is limited by the relief valve 27.4, and under the action of the throttling channel of the one-way throttle valve 3, the paver screed can be lowered smoothly.

When the paver screed implements the floating function, only the electromagnet Y9 of the solenoid valve 10 and the electromagnet Y10 of the solenoid valve 2 11 are energized, and the other electromagnets Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8 is both powered off. At this time, the oil in the upper and lower chambers of the left and right lifting cylinders 8 and 9 of the screed passes through the K-type center position of the solenoid valve three 7.2 and the three-position four-way solenoid valve one 2 and simultaneously with the hydraulic valve block 7 The oil return path T is connected to realize the floating of the screed. Since the oil flow in the upper and lower chambers of the lifting cylinder is not affected by any damping, "complete floating" of the paver screed can be achieved.

When the paver screed implements the locking function, only the electromagnet Y8 of the solenoid valve 7.3 is energized, and the other electromagnets Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y9, and Y10 are all powered off. The oil in the upper and lower chambers of the left and right lifting cylinders 8 and 9 of the paving screed is locked by solenoid valve 7.3, solenoid valve one 10, and solenoid valve two 11, making the lifting cylinder unable to operate.

When the paver screed implements the power assist function, the advantage of this technical solution is that the left and right lifting cylinders can be assisted simultaneously or independently controlled as needed. When it is necessary to boost the left and right lifting cylinders at the same time, use the solenoid Y1 of the two-position four-way solenoid valve 1, the solenoid Y4 of the three-position four-way solenoid valve 2 4.1, and the solenoid Y7 of the solenoid valve 4 7.2. , solenoid Y9 of solenoid valve 10 and solenoid Y10 of solenoid valve 2 11 are energized, and the other electromagnets Y2, Y3, Y5, Y6, and Y8 are all powered off. At this time, the main oil circuit P of hydraulic valve block 7 starts from the flow The Pb port and Pd port of valve 7.5 flow through the high-pressure port P3 and control port A3 of the three-position four-way electromagnetic reversing valve 2 4.1, to the pressure reducing check valve 1 4.2, and after decompressing the inlet pressure, it is divided into two channels, one channel It flows through the high-pressure port P5 and control port A5 of the two-position four-way electromagnetic reversing valve 26, flows out from the oil outlet Ab of the hydraulic valve block 7, and passes through the solenoid valve 10 installed on the rod cavity of the left lifting cylinder 8. The rod chamber of the left lifting cylinder 8; the other flow flows out from the oil outlet Ba of the hydraulic valve block 7 and passes through the solenoid valve 211 installed on the rod chamber of the right lifting cylinder 9 to the rod chamber of the right lifting cylinder 9. At this time, the assist pressure of the paver screed is adjusted by the pressure reducing check valve 2 4.2, so that the rod cavity of the lifting cylinder always maintains a certain back pressure, reducing the effect of the screed's own gravity on the paved mixture. The back pressure of the rod cavity of the lifting cylinder can be determined by the left lifting cylinder pressure sensor 8.1 installed on the rod cavity of the left lifting cylinder 8 and the right lifting cylinder installed on the rod cavity of the right lifting cylinder 9 in the electrical control system. Pressure sensor 9.1 is used for monitoring. When the left and right lifting cylinders need to be assisted separately, the following operations need to be performed on the basis of simultaneous assisting of the left and right lifting cylinders, that is, the solenoid Y5 of the three-position four-way electromagnetic reversing valve three 5.1 and the two-position four-way electromagnetic commutation When the electromagnet Y6 of valve two 6 is energized, the reversing pressure reducing valve 14 can assist and adjust the rod cavity of the left lifting cylinder 8, and the reversing pressure reducing valve 5 can assist the rod cavity of the right lifting cylinder 9. adjust.

When the paver screed implements the anti-climbing function, the electromagnet Y1 of the two-position four-way electromagnetic reversing valve one 1, the electromagnet Y3 of the three-position four-way electromagnetic reversing valve one 2, and the electromagnet of the solenoid valve four 7.2 Y7 is powered, and the other electromagnets Y2, Y4, Y5, Y6, Y8, Y9, and Y10 are all powered off. At this time, the main oil line P of the hydraulic valve block 7 flows from the Pb, Pc, and Pe ports of the flow valve through the three-position four Through the high-pressure port P2 and control port A2 of the solenoid valve 12, through the solenoid valve 47.3, it flows out from the oil outlet Aa of the hydraulic valve block 7 into the rodless chambers of the left and right lifting cylinders 8 and 9. Since the left The rod cavity of the lifting cylinder 8, under the action of the solenoid valve 10, prevents the left lifting cylinder 8 from descending, and the rod cavity of the right lifting cylinder 9, under the action of the solenoid valve 2 11, prevents the right lifting cylinder 9 from descending, so This can maintain a certain pressure in the rodless cavities of the left and right lifting cylinders to prevent the paver screed from rising temporarily. The back pressure of the rodless cavity of the lifting cylinder can be adjusted through the relief valve 27.4.

As shown in Figure 3, the present invention also provides a method for controlling the screed of the paver during the parking and starting stages, which includes the following steps:

1) The operator triggers the parking command through the console in the electrical control system, and the controller immediately issues an anti-climb function command to the hydraulic control system to implement anti-climb function control on the screed;

2) The left lifting cylinder displacement sensor and the right lifting cylinder displacement sensor monitor the screed displacement in real time. When the displacement detection value is greater than the paving thickness measurement value before parking, the controller issues a locking function instruction to the hydraulic control system to lock the screed. Function control; otherwise, continue to control the anti-climbing function of the screed;

3) After parking, until the operator triggers the starting command through the console in the electrical control system, the controller delays for 5 seconds and issues a floating function command to the hydraulic control system to implement floating function control on the screed;

4) The left lifting cylinder displacement sensor and the right lifting cylinder displacement sensor monitor the screed displacement in real time. When the displacement detection value is less than the paving thickness measurement value before parking, the controller issues a power-assist function command to the hydraulic control system to assist the screed. Function control, and the controller can detect the assist pressure of the screed based on the pressure sensor of the left lifting cylinder and the pressure sensor of the right lifting cylinder, and adjust the assist pressure in real time through the hydraulic control system according to the displacement changes of the left and right lifting cylinders, thereby reducing the need for ironing. The influence of the gravity of the screed will allow the screed to quickly enter the "floating state"; otherwise, the screed will continue to be controlled by the floating function.

Of course, the above embodiments are only preferred solutions of the present invention, and are not specifically limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation modes. Any equivalent changes or improvements made based on the application scope of the present invention shall still fall within the scope of the patent of the present invention.

Claims (8)

1. Multifunctional control system for paver screed, characterized in that the hydraulic control system includes a two-position four-way electromagnetic reversing valve (1), a three-position four-way electromagnetic reversing valve (2), and a one-way joint Flow valve (3), reversing pressure reducing valve one (4), reversing pressure reducing valve two (5), two two-position four-way electromagnetic reversing valve two (6), hydraulic valve block (7) and are installed on the left side respectively. Solenoid valve one (10) and solenoid valve two (11) on the rod cavity of the lifting cylinder (8) and the rod cavity of the right lifting cylinder (9); the hydraulic valve block (7) includes a relief valve ( 7.1), solenoid valve three (7.2), solenoid valve four (7.3), relief valve two (7.4), flow valve (7.5) and relief valve three (7.6); The high-pressure port P1 and the oil return port T1 of the two-position four-way electromagnetic directional valve one (1) are respectively connected to the main oil path Pa and the first return oil path Ta of the hydraulic valve block 7, and the two control ports A1 , B1 are respectively connected to the second oil return line Tb and pressure measuring interface M1 of the hydraulic valve block (7); The high-pressure port P2 and return port T2 of the three-position four-way electromagnetic reversing valve one (2) are respectively connected with the first pressure oil path Pe of the flow valve (7.5) and the third return oil path Tc of the hydraulic valve block (7). are connected, and the two control ports A2 and B2 are respectively connected to the first oil outlet Aa and the second oil outlet Ba of the hydraulic valve block (7); the one-way throttle valve (3) is connected in series on three Between the control port B2 of the four-way solenoid directional valve one (2) and the second oil outlet Ba of the hydraulic valve block (7); The reversing and pressure reducing valve one (4) includes a three-position four-way electromagnetic reversing valve two (4.1) and a pressure reducing one-way valve (4.2). The high-pressure port of the three-position four-way electromagnetic reversing valve two (4.1) P3 and return port T3 are respectively connected to another pressure oil path Pf of the flow valve (7.5) and the fourth return oil path Td of the hydraulic valve block (7), and a control port A3 and a pressure reducing check valve ( 4.2) After series connection, it is connected to the outlet Ac of the one-way throttle valve (3), and the other control port B3 is blocked on the hydraulic valve block (7); The reversing and pressure reducing valve two (5) includes a three-position four-way electromagnetic reversing valve three (5.1) and a pressure reducing check valve two (5.2). The high-pressure port of the three-position four-way electromagnetic reversing valve three (5.1) P4 and return port T4 are respectively connected to the other pressure oil path Ps of the flow valve (7.5) and the fifth return oil path Te of the hydraulic valve block 7, and a control port A4 and the second pressure reducing check valve (5.2) After series connection, it is connected to the oil return port T5 of the two-position four-way electromagnetic reversing valve (6); the other control port B4 is blocked on the hydraulic valve block (7); The high-pressure port P5 of the two-position four-way electromagnetic reversing valve (6) is connected to the outlet Ac of the one-way throttle valve (3), and a control port A5 is connected to the third oil outlet of the hydraulic valve block (7). The port Ab is connected, and the other control port B5 is blocked on the hydraulic valve block (7); The flow valve (7.5) divides the main oil circuit P into two pressure oil circuits Pc and Pd, and is connected to the two pressure measuring interfaces M2 and M3 of the hydraulic valve block (7) respectively. The relief valve (7.1) is connected in parallel between the first pressure oil channel Pd of the flow valve (7.5) and the fourth return oil channel Td of the hydraulic valve block (7); the second relief valve (7.4) is connected in parallel between the three-position four-way Between the control port A2 of the electromagnetic reversing valve one (2) and the third oil return line Tc of the hydraulic valve block (7); the relief valve three (7.6) is connected in parallel to the two-position four-way electromagnetic reversing valve one. Between the control port B1 of (1) and the first oil return line Ta of the hydraulic valve block (7); the solenoid valve three (7.2) is connected in parallel between the outlet of the one-way throttle valve (3) and the three-position four-way between the control port A2 of the electromagnetic reversing valve one (2); the four solenoid valves (7.3) are connected in series between the inlet of the two relief valves (7.4) and the first oil outlet Aa of the hydraulic valve block (7) between; The first oil outlet Aa of the hydraulic valve block (7) is connected to the rodless chambers of the left lifting cylinder (8) and the right lifting cylinder (9) respectively; The second oil outlet Ba of the hydraulic valve block (7) and the second solenoid valve (11) are connected in series and then connected to the rod cavity of the right lifting cylinder (9); The third oil outlet Ab of the hydraulic valve block (7) and the solenoid valve (10) are connected in series and then connected to the rod cavity of the left lifting cylinder (8). 2. The multifunctional control system for the paver screed according to claim 1, further comprising a left lifting cylinder pressure sensor and a right lifting cylinder pressure sensor; The left lifting cylinder pressure sensor is installed on the rod cavity of the left lifting cylinder; The pressure sensor of the right lifting cylinder is installed on the rod cavity of the right lifting cylinder. 3. The multifunctional control system for the paver screed according to claim 1, further comprising a left lifting cylinder displacement sensor and a right lifting cylinder displacement sensor; The left lifting cylinder displacement sensor is installed on the piston rod of the left lifting cylinder; The right lifting cylinder displacement sensor is installed on the piston rod of the right lifting cylinder. 4. The multifunctional control system of the paver screed according to claim 1, characterized in that the middle of the two-position four-way electromagnetic reversing valve one (1) and the two-position four-way electromagnetic reversing valve two (6) The bit function is type II. 5. The multi-functional control system for the paver screed according to claim 1, characterized in that the neutral function of the three-position four-way electromagnetic reversing valve one (2) is K-type. 6. The multifunctional control system of the paver screed according to claim 1, characterized in that the middle position of the three-position four-way electromagnetic reversing valve two (4.1) and the three-position four-way electromagnetic reversing valve three (5.1) is The bit function is Y-shaped. 7. The multifunctional control system for the paver screed according to claim 1, characterized in that the pressure adjustment of the first reversing pressure reducing valve (4) and the second reversing pressure reducing valve (5) is electrically proportional. 8. A control method for the multifunctional control system of the paver screed according to any one of claims 1 to 7, characterized in that it includes the following steps: 1) The operator triggers the parking command through the console, and the controller immediately issues an anti-climb function command to the hydraulic control system to implement anti-climb function control on the screed; 2) The left lifting cylinder displacement sensor and the right lifting cylinder displacement sensor monitor the screed displacement in real time. When the displacement detection value is greater than the paving thickness measurement value before parking, the controller issues a locking function command to the hydraulic control system to lock the screed. Function control; otherwise, continue to control the anti-climbing function of the screed; 3) After parking, until the operator triggers the starting command through the console, the controller delays for a set time and issues a floating function command to the hydraulic control system to implement floating function control on the screed; 4) The left lifting cylinder displacement sensor and the right lifting cylinder displacement sensor monitor the screed displacement in real time. When the displacement detection value is less than the paving thickness measurement value before parking, the controller issues a power-assist function command to the hydraulic control system to assist the screed. Function control, and the controller detects the assist pressure of the screed based on the pressure sensor of the left lifting cylinder and the pressure sensor of the right lifting cylinder, and adjusts the assist pressure in real time through the hydraulic control system as the displacement of the left and right lifting cylinders changes, so that the screed Quickly enter the "floating state"; otherwise, continue to control the floating function of the screed.