Electro-hydraulic control system for screed of slipform paver

Abstract

The electro-hydraulic control system of the slip-form paver screed device relates to the technical field of hydraulic control. The system comprises a first pressure oil source, a first oil tank, a first speed regulating valve, a fourth speed regulating valve, a first reversing valve, a second reversing valve and a first electric proportional speed regulating valve. The combined speed regulating valve comprises a throttle valve, a pressure compensating valve and a one-way valve. The throttle valve can be a manual throttle valve or an electric proportional throttle valve. The pressure compensating valve is a normally open pressure compensating valve. The pilot control port of the normally open pressure compensating valve is connected to the oil inlet port of the matched reversing valve. Before the reversing valve is opened by electricity, the compensating valve is in a closed state. After the reversing valve is opened by electricity, when the pressure oil flows through the throttle valve, the pressure drop between the inlet and outlet ports of the throttle valve will not instantaneously increase, and the subsequent hydraulic motor starts more stably.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic control, in particular to an electro-hydraulic control system of a slipform paver screed device. BACKGROUND

[0002] The screed device, as an important auxiliary working mechanism of the slipform paver, is often used to level the newly-paved cement concrete when paving the road surface, and has the advantages of high automation degree and uniform leveling effect compared with manual leveling.

[0003] The screed device mainly includes a screed plate, a support, a track and an electro-hydraulic driving system, and is installed at the rear of the mold and driven by several hydraulic motors to move the screed plate left and right and forward and backward along the newly-paved concrete.

[0004] The existing transverse electro-hydraulic driving system of the screed device usually uses a conventional speed regulating valve to control the transverse moving speed of the screed plate, and an electromagnetic reversing valve to control the moving direction of the screed plate. When the moving direction of the screed plate is switched from left to right or from right to left, a starting impact often occurs, resulting in poor leveling effect. SUMMARY

[0005] The purpose of the present application is to provide an electro-hydraulic control system of a slipform paver screed device, which can effectively solve the problems in the background art.

[0006] The technical solution to achieve the above purpose is:

[0007] The electro-hydraulic control system of the slipform paver screed device of the present application is used for two kinds of driving structure of the paver screed device, specifically:

[0008] The first driving structure of the paver screed device

[0009] An electro-hydraulic control system of a slipform paver screed device, the screed device is installed on a truss through a walking trolley which can displace horizontally, the truss is installed with a first main drive motor which drives the walking trolley to displace horizontally, and the walking trolley is installed with a first auxiliary drive motor which drives the screed device to level the concrete road surface in the forward and backward directions;

[0010] Characterized in that: the electro-hydraulic control system comprises a first pressure oil source, a first oil tank, a first speed regulating valve, a fourth speed regulating valve, a first reversing valve, a second reversing valve and a first electric proportional speed regulating valve.

[0011] The first speed regulating valve and the fourth speed regulating valve are the same, each comprising a throttle valve, a pressure compensating valve and a first check valve, the inlet 2 of the throttle valve is connected with the outlet 2 of the first check valve, the outlet 1 of the throttle valve is connected with the inlet 1 of the pressure compensating valve, and the outlet 2 of the pressure compensating valve is connected with the inlet 1 of the first check valve.

[0012] The pressure oil port 1 of the first reversing valve is connected with a first pressure oil source, the return oil port 2 is connected with a first oil tank, the working oil port 3 is connected with an oil inlet 2 of a throttle valve in a first speed regulating valve, the working oil port 4 is connected with an oil inlet 2 of a throttle valve in a fourth speed regulating valve, an oil outlet 2 of a pressure compensation valve in the first speed regulating valve is connected with an oil port A of a first main drive motor, pilot control ports 3 of the pressure compensation valves in the first speed regulating valve and the fourth speed regulating valve are connected with the pressure oil port 1 of the first reversing valve, and an oil port B of the first main drive motor is connected with the oil outlet 2 of the pressure compensation valve in the fourth speed regulating valve.

[0013] The pressure oil port 1 of the second reversing valve is connected with the first pressure oil source through a first electric proportional speed regulating valve, the return oil port 2 is connected with the first oil tank, the working oil port 3 is connected with an oil port A of a first auxiliary drive motor, and the working oil port 4 is connected with an oil port B of the first auxiliary drive motor.

[0014] Further, the electro-hydraulic control system further comprises a first smoothing device switch and a first controller, an input end of the first smoothing device switch is connected with a power supply, an output end is connected with a power supply end of the first controller, and the first reversing valve, the second reversing valve and the first electric proportional speed regulating valve are connected with output ends of the first controller respectively.

[0015] Further, the throttle valve is a manual throttle valve or an electric proportional throttle valve, and the pressure compensation valve is a normally open pressure compensation valve.

[0016] Further, the electro-hydraulic control system further comprises a first pressure reducing valve, an oil inlet 1 and an oil outlet 2 of the first pressure reducing valve are connected in series between the pressure oil port 1 of the first reversing valve and the pressure oil source, an adjusting port 3 of the first pressure reducing valve is connected with the oil tank, and an oil inlet of the first electric proportional speed regulating valve is connected with the oil inlet 1 of the first pressure reducing valve.

[0017] Further, the electro-hydraulic control system further comprises a first load-sensitive valve, a first safety valve, a second check valve and a shuttle valve, an oil inlet 1 of the first load-sensitive valve is connected with a P port of the first pressure oil source, sensitive ports 2 are connected with an oil outlet 2 of the second check valve and an oil port 3 of the shuttle valve respectively, and an oil outlet 3 is connected with the first oil tank, an oil inlet 1 of the second check valve is connected with an oil port A of the first auxiliary drive motor, an oil port 1 of the shuttle valve is connected with an oil port A of the first main drive motor, and an oil port 2 is connected with an oil port B of the first main drive motor, and an oil inlet of the first safety valve is connected with the P port of the first pressure oil source, and an oil outlet 2 is connected with the first oil tank.

[0018] Second driving structure of a paver smoothing device

[0019] The electro-hydraulic control system of the screed device of the slip-form paver, the screed device is installed on the truss through the walking trolley which can be transversely displaced, the truss is installed with the second main drive motor and the third main drive motor which drive the walking trolley to be transversely displaced, the walking trolley is installed with the second auxiliary drive motor which drives the screed device to level the concrete pavement in the front and back directions;

[0020] The electro-hydraulic control system comprises a second pressure oil source, a second oil tank, a second speed regulating valve, a third reversing valve, a third speed regulating valve, a fourth reversing valve, a fifth reversing valve and a second electric proportional speed regulating valve.

[0021] The pressure oil port 1 of the third reversing valve is connected to the second pressure oil source, the oil return port 2 is connected to the second oil tank, the working oil port 3 is connected to the oil inlet 2 of the throttle valve in the second speed regulating valve, the oil outlet 2 of the pressure compensation valve in the second speed regulating valve is connected to the oil port A of the second main drive motor, the pilot control port 3 of the pressure compensation valve in the second speed regulating valve is connected to the pressure oil port 1 of the third reversing valve, and the oil port B of the second main drive motor is connected to the second oil tank.

[0022] The pressure oil port 1 of the fourth reversing valve is connected to the second pressure oil source, the oil return port 2 is connected to the second oil tank, the working oil port 3 is connected to the oil inlet 2 of the throttle valve in the third speed regulating valve, the oil outlet 2 of the pressure compensation valve in the third speed regulating valve is connected to the oil port A of the second main drive motor, the pilot control port 3 of the pressure compensation valve in the third speed regulating valve is connected to the pressure oil port 1 of the fourth reversing valve, and the oil port B of the third main drive motor is connected to the second oil tank.

[0023] The pressure oil port 1 of the fifth reversing valve is connected to the second pressure oil source through the second electric proportional speed regulating valve, the oil return port 2 is connected to the second oil tank, the working oil port 3 is connected to the oil port A of the second auxiliary drive motor, and the working oil port 4 is connected to the oil port B of the second auxiliary drive motor.

[0024] Further, the throttle valve is a manual throttle valve or an electric proportional throttle valve, and the pressure compensation valve is a normally open pressure compensation valve.

[0025] Further, the electro-hydraulic control system further comprises a second screed device switch and a second controller, the input end of the second screed device switch is connected to a power supply, the output end is connected to the power supply end of the second controller, and the third reversing valve, the fourth reversing valve, the fifth reversing valve and the second electric proportional speed regulating valve are respectively connected to the output end of the second controller.

[0026] Further, the electro-hydraulic control system further comprises a second pressure reducing valve, the inlet 1 and the outlet 2 of the second pressure reducing valve are connected in series between the pressure oil port 1 of the third directional valve and the second pressure oil source, the adjusting port 3 of the second pressure reducing valve is connected to the oil tank, the pressure oil port 1 of the fourth directional valve is connected to the outlet 2 of the second pressure reducing valve, and the inlet of the second electric proportional speed regulating valve is connected to the inlet 1 of the second pressure reducing valve.

[0027] Further, the electro-hydraulic control system further comprises a second load-sensitive valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve and a second safety valve, the inlet 1 of the second load-sensitive valve is connected to the P port of the second pressure oil source, the sensitive ports 2 are respectively connected to the outlets of the third one-way valve, the fourth one-way valve and the fifth one-way valve, the outlet of the second load-sensitive valve is connected to the oil tank, the inlet 1 of the third one-way valve is connected to the oil port A of the second main drive motor, the inlet 1 of the fourth one-way valve is connected to the oil port A of the third main drive motor, and the inlet 1 of the fifth one-way valve is connected to the oil port A of the second auxiliary drive motor; the inlet of the second safety valve is connected to the P port of the second pressure oil source, and the outlet 2 is connected to the oil tank.

[0028] Advantages of the present application:

[0029] 1) The combined speed regulating valve designed in the present application comprises a throttle valve, a pressure compensating valve and a one-way valve, the throttle valve can be a manual throttle valve or an electric proportional throttle valve, the pressure compensating valve is a normally open type pressure compensating valve, the pilot control port of the normally open type pressure compensating valve is connected to the inlet of the matched directional valve, and the compensating valve is in a closed state before the directional valve is opened by power supply, when the pressure oil flows through the throttle valve after the directional valve is opened by power supply, the pressure drop between the inlets and outlets of the throttle valve will not instantaneously increase, and the start of the hydraulic motor behind is more stable.

[0030] 2) The pressure reducing valve can set the working pressure of the transverse drive hydraulic motor of the smoothing device according to the actual working condition, and the hydraulic motor works more stably.

[0031] 3) The load-sensitive valve is adopted to adapt the load size of the actuator to change the pressure of the constant displacement pump system, and the system is more energy-saving. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a hydraulic system schematic diagram of the first embodiment;

[0033] Figure 2 It is an electric control schematic diagram of the first embodiment;

[0034] Figure 3 It is a structural schematic diagram of the smoothing device of the slip-form paver in the second embodiment;

[0035] Figure 4 It is a hydraulic system schematic diagram of the second embodiment;

[0036] Figure 5 The electric control principle diagram of the second embodiment. DETAILED DESCRIPTION Embodiment 1

[0037] The embodiment discloses an electro-hydraulic control system of a slipform paver screed device, and is used for electro-hydraulic control of the slipform paver screed device, and the slipform paver screed device is specifically a structure of an electro-hydraulic control screed device and a disclosed screed device in a concrete slipform paver (202010017525.1), and the electro-hydraulic control system comprises a main drive motor 16 for controlling transverse displacement of the screed device and a secondary drive motor 17 for controlling longitudinal displacement of the screed device.

[0038] Specifically, as shown in Figure 1 , 2 , the electro-hydraulic control system comprises a first pressure oil source 12, a first oil tank 13, a first speed regulating valve 14, a fourth speed regulating valve 52, a first reversing valve 15, a second reversing valve 5 and a first electric proportional speed regulating valve 6, and the first reversing valve 15 and the second reversing valve 5 are electric reversing valves.

[0039] The first speed regulating valve 14 and the fourth speed regulating valve 52 each comprise a first throttle valve 9, a first pressure compensation valve 10 and a first one-way valve 11, the first throttle valve 9 is a manual throttle valve or an electric proportional throttle valve, and the first pressure compensation valve 10 is a normally open pressure compensation valve; an oil inlet 2 of the first throttle valve 9 is connected with an oil outlet 2 of the first one-way valve 11, an oil outlet 1 of the first throttle valve 9 is connected with an oil inlet 1 of the first pressure compensation valve 10, and an oil outlet 2 of the first pressure compensation valve 10 is connected with an oil inlet 1 of the first one-way valve 11.

[0040] A pressure oil port 1 of the first reversing valve 15 is connected with a pressure oil port P of the first pressure oil source 12, a return oil port 2 is connected with the first oil tank 13, a working oil port 3 is connected with an oil inlet 2 of the first throttle valve 9 in the first speed regulating valve 14, a working oil port 4 is connected with an oil inlet 2 of the first speed regulating valve 14 in the fourth speed regulating valve 52, an oil outlet 2 of the first pressure compensation valve 10 in the first speed regulating valve 14 is connected with an oil port A of the first main drive motor 16, pilot control ports 3 of the first pressure compensation valves 10 in the first speed regulating valve 14 and the fourth speed regulating valve 52 are each connected with the pressure oil port 1 of the first reversing valve 15, and an oil port B of the first main drive motor 16 is connected with the oil outlet 2 of the first pressure compensation valve 10 in the fourth speed regulating valve 52.

[0041] A pressure oil port 1 of the second reversing valve 5 is connected with the first pressure oil source 12 through the first electric proportional speed regulating valve 6, a return oil port 2 is connected with the first oil tank 13, a working oil port 3 is connected with an oil port A of the first secondary drive motor 17, and a working oil port 4 is connected with an oil port B of the first secondary drive motor 17.

[0042] In the embodiment, the electro-hydraulic control system further comprises a first pressure reducing valve 18, a first load sensitive valve 19, a shuttle valve 20, a second check valve 21, a first safety valve 22, the oil inlet 1 and the oil outlet 2 of the first pressure reducing valve 18 are connected in series between the pressure oil port 1 of the first reversing valve 15 and the first pressure oil source 12, the oil inlet 1 of the first electric proportional speed regulating valve 6 is connected to the oil inlet 1 of the first pressure reducing valve 18, and the adjusting port 3 of the first pressure reducing valve 18 is connected to the first oil tank 13; the oil inlet 1 of the first load sensitive valve 19 is connected to the P port of the first pressure oil source 1, the sensitive ports 2 are respectively connected to the oil outlet 2 of the second check valve 21 and the oil port 3 of the shuttle valve 20, and the oil outlet 3 is connected to the first oil tank 13; the oil inlet 1 of the second check valve 21 is connected to the oil port A of the first auxiliary drive motor 17; the oil inlet of the first safety valve 22 is connected to the P port of the first pressure oil source 12, and the oil outlet 2 is connected to the first oil tank 13; the oil port 1 of the shuttle valve 20 is connected to the oil port A of the first main drive motor 16, and the oil port 2 is connected to the oil port B of the first main drive motor 16.

[0043] In the embodiment, the electro-hydraulic control system further comprises a first troweling device switch 23 and a first controller 24, the first controller 24 can be but is not limited to a single-chip microcomputer, the input end of the first troweling device switch 23 is connected to a power supply, and the output end is connected to the power supply end of the first controller 1, and the first reversing valve 15, the second reversing valve 5 and the first electric proportional speed regulating valve 6 are respectively connected to the output end of the first controller 24.

[0044] The working principle of the present application is as follows:

[0045] When the first troweling device switch 23 is turned on, the hydraulic oil output by the first pressure oil source 1 enters the oil inlet 1 of the first pressure reducing valve 18 and the oil inlet 1 of the electric proportional speed regulating valve 6, which are respectively used as power sources for horizontal movement and vertical movement of the troweling device.

[0046] The horizontal movement process of the troweling device is as follows: the first controller 24 controls the spool of the first reversing valve 15 to switch to the right position, the hydraulic oil after pressure reduction of the first pressure reducing valve 18 enters the working oil port 3 of the first reversing valve 15 through the oil inlet 1, and then enters the A port of the first main drive motor 16 after passing through the first throttling valve 9 in the first speed regulating valve 14 and the first pressure compensating valve 10, thereby driving the first main drive motor 16 to rotate and driving the troweling device to move horizontally to one side; at this time, the first one-way valve 11 in the first speed regulating valve 14 is in reverse closing, and the hydraulic oil output by the oil port B of the first main drive motor 16 returns to the first oil tank 13 through the one-way valve 11 of the fourth speed regulating valve 52, the working oil port 4 of the first reversing valve 15 and the return oil port 2.

[0047] The first controller 24 controls the valve core of the first directional valve 15 to switch to the left position. The hydraulic oil after pressure reduction by the first pressure reducing valve 18 goes through the oil inlet 1 of the first directional valve 15 to the working oil port 4, and then through the first throttle valve 9 and the first pressure compensation valve 10 in the fourth speed regulating valve 52 to input the B port of the first main drive motor 16, driving the first main drive motor 16 to rotate and drive the smoothing device to move laterally to the other side. At this time, the first check valve 11 in the fourth speed regulating valve 52 is in reverse closed position. The hydraulic oil output from the A port of the first main drive motor 16 returns to the first oil tank 13 through the check valve 11 of the first speed regulating valve 14, the working oil port 3 of the first directional valve 15, and the return oil port 2.

[0048] The longitudinal movement principle of the smoothing device: The second controller 24 controls the valve core of the second directional valve 5 to switch to the right position. The hydraulic oil output from the first pressure oil source 1 enters the second directional valve 5 through the first electro-proportional speed regulating valve 6. The pressure oil enters the A port of the first auxiliary drive motor 17 from the second directional valve 5 through the oil inlet 1 and the working oil port 3, driving the first auxiliary drive motor 17 to rotate and causing the smoothing device to move longitudinally reciprocatingly. Low-pressure oil is discharged from the B port of the first auxiliary drive motor 17 and flows through the working oil port 4 and the return oil port 2 of the second directional valve 5 to the first oil tank 21.

[0049] When the controller 24 controls the valve core of the second directional valve 5 to switch to the left position, the pressure oil is cut off at the oil inlet 1 of the second directional valve 5, and the second directional valve 5 remains stationary. Example 2

[0050] like Figures 3-5 As shown, this embodiment discloses an electro-hydraulic control system for the smoothing device of a slipform paver, used for electro-hydraulic control of the smoothing device. The structure of the smoothing device is largely the same as that of the smoothing device in the first embodiment, both equipped with a main drive motor for controlling the lateral displacement of the smoothing device and a second auxiliary drive motor 45 for controlling the longitudinal displacement of the smoothing device. The difference is that the lateral displacement drive mechanism is equipped with two main drive motors mounted on the truss 26, namely a second main drive motor 27 and a third main drive motor 28. The truss 26 rotates... Two drums 29 are installed, with steel wire ropes 30 wound on them. A second main drive motor 27 is connected to one of the drums 29, and a third main drive motor 28 is connected to the other drum 29. Guide wheels 31 are installed at both ends of the truss 26. A guide wheel 31 is rotatably mounted on the truss 26 below the left drum 29. The steel wire rope on the left drum 29 is connected to the traveling trolley 33 after passing around the guide wheel 31. The steel wire rope on the right drum 29 passes around the guide wheel 31 at the right end and the guide wheel 31 at the left end in sequence before being connected to the traveling trolley 33.

[0051] Specifically, the electro-hydraulic control system comprises a second pressure oil source 34, a second oil tank 35, a third speed regulating valve 36, a third directional valve 37, a fourth directional valve 38, a third speed regulating valve 39, a second electric proportional speed regulating valve 40, and a fifth directional valve 41. The third directional valve 37, the fourth directional valve 38, and the fifth directional valve 41 are all electric directional valves.

[0052] The second speed regulating valve 36 and the third speed regulating valve 39 are identical in structure and each comprises a second throttle valve 42, a second pressure compensation valve 43, and a sixth check valve 44 connected in series. The second throttle valve 42 is a manual throttle valve or an electric proportional throttle valve, and the second pressure compensation valve 43 is a normally open pressure compensation valve. The oil inlet 2 of the second throttle valve 42 is connected to the oil outlet 2 of the sixth check valve 44, the oil outlet 1 of the second throttle valve 42 is connected to the oil inlet 1 of the second pressure compensation valve 43, and the oil outlet 2 of the second pressure compensation valve 43 is connected to the oil inlet 1 of the sixth check valve 44.

[0053] The pressure oil port 1 of the third directional valve 37 is connected to the pressure oil port P of the second pressure oil source 34, the return oil port 2 is connected to the second oil tank 35, the working oil port 3 is connected to the oil inlet 2 of the second throttle valve 42 in the second speed regulating valve 36, the working oil port 4 is connected to the second oil tank 35, the oil port A of the second main drive motor 27 is connected to the oil outlet 2 of the second pressure compensation valve 43 in the second speed regulating valve 36, the pilot control port 3 of the second pressure compensation valve 43 in the second speed regulating valve 36 is connected to the pressure oil port 1 of the third directional valve 37, and the oil port B of the second main drive motor 27 is connected to the second oil tank 35.

[0054] The pressure oil port 1 of the fourth directional valve 38 is connected to the second pressure oil source 34, the return oil port 2 is connected to the second oil tank 35, the working oil port 3 is connected to the oil inlet 2 of the second throttle valve 42 in the third speed regulating valve 39, the oil port A of the third main drive motor 28 is connected to the oil outlet 2 of the second pressure compensation valve 43 in the third speed regulating valve 39, the pilot control port 3 of the second pressure compensation valve 43 in the third speed regulating valve 39 is connected to the pressure oil port 1 of the fourth directional valve 38, and the oil port B of the third main drive motor 28 is connected to the second oil tank 35.

[0055] The pressure oil port 1 of the fifth directional valve 41 is connected to the second pressure oil source 34 through the second electric proportional speed regulating valve 40, the return oil port 2 is connected to the second oil tank 35, the working oil port 3 is connected to the oil port A of the second auxiliary drive motor 45, and the working oil port 4 is connected to the oil port B of the second auxiliary drive motor 45.

[0056] In the embodiment, the electro-hydraulic control system further comprises a second pressure reducing valve 46, a second load-sensitive valve 47, a third check valve 48, a fourth check valve 49, a fifth check valve 50, and a second safety valve 51; the oil inlet 1 and the oil outlet 2 of the second pressure reducing valve 46 are connected in series between the pressure oil port 1 of the third directional valve 37 and the second pressure oil source 34; the adjusting port 3 of the second pressure reducing valve 46 is connected to the second oil tank 35; the pressure oil port 1 of the fourth directional valve 38 is connected to the oil outlet 2 of the second pressure reducing valve 46; and the oil inlet 1 of the second electric proportional speed regulating valve 40 is connected to the oil inlet 1 of the second pressure reducing valve 46.

[0057] The oil inlet 1 of the second load-sensitive valve 47 is connected to the P port of the second pressure oil source 34; the sensitive ports 2 are respectively connected to the oil outlets 2 of the third check valve 48, the fourth check valve 49, and the fifth check valve 50; the oil outlet of the second load-sensitive valve 47 is connected to the second oil tank 35; the oil inlet 1 of the third check valve 48 is connected to the oil port A of the second main drive motor 27; the oil inlet 1 of the fourth check valve 49 is connected to the oil port A of the third main drive motor 28; and the oil inlet 1 of the fifth check valve 50 is connected to the oil port A of the second auxiliary drive motor 45; the oil inlet of the second safety valve 51 is connected to the P port of the second pressure oil source 34; and the oil outlet 2 is connected to the second oil tank 35.

[0058] In the embodiment, the electro-hydraulic control system further comprises a second screeding device switch 55 and a second controller 56; the second controller 56 can be, but is not limited to, a single-chip microcomputer; the input end of the second screeding device switch 55 is connected to a power supply; and the output end is connected to the power supply end of the second controller 56; and the third directional valve 37, the fourth directional valve 38, the fifth directional valve 41, and the second electric proportional speed regulating valve 40 are respectively connected to the output end of the second controller 56.

[0059] Working principle of the application:

[0060] When the second screeding device switch 55 is turned on, the hydraulic oil output by the second pressure oil source 34 is used as the power source for the horizontal movement and the vertical movement of the screeding device through the oil inlets 1 of the second pressure reducing valve 46 and the electric proportional speed regulating valve 50.

[0061] Horizontal movement process of the screeding device:

[0062] The second controller 56 controls the spool of the third directional valve 37 to switch to the right position, and the hydraulic oil after pressure reduction of the second pressure reducing valve 46 enters the working oil port 3 of the third directional valve 37 through the oil inlet port 1, then enters the A port of the second main drive motor 27 through the second speed regulating valve 42 and the second pressure compensation valve 43 in the second speed regulating valve 36, drives the second main drive motor 27 to rotate, drives the screed device to move from right to left, and the low-pressure oil is discharged from the B port of the second main drive motor 27 to enter the hydraulic second oil tank 35; at the same time, the second controller 56 controls the spool of the fourth directional valve 38 to be in the left position, and the 2, 3 and 4 ports of the fourth directional valve 38 are communicated, and the third main drive motor 28 is in the state of being dragged in the opposite direction by the screed device, and the third main drive motor 28 sucks oil from the hydraulic oil tank 34 into the B port, and then discharges from the A port, and then returns to the hydraulic second oil tank 35 through the fourth one-way valve 49 and the 4 and 2 ports of the fourth directional valve 38.

[0063] Similarly, the second controller 56 controls the spool of the fourth directional valve 38 to switch to the right position, and the pressure oil enters the working oil port 3 of the fourth directional valve 38 through the oil inlet port 1, then enters the A port of the third main drive motor 28 through the second speed regulating valve 42 and the second pressure compensation valve 43 in the third speed regulating valve 39, drives the third main drive motor 28 to rotate, drives the screed device to move from left to right, and the low-pressure oil is discharged from the B port of the third main drive motor 28 to enter the hydraulic second oil tank 35; at the same time, the second controller 56 controls the spool of the third directional valve 37 to be in the left position, and the 2, 3 and 4 ports of the third directional valve 37 are communicated, and the second main drive motor 27 is in the state of being dragged in the opposite direction by the screed device, and the second main drive motor 27 sucks oil from the hydraulic oil tank 34 into the B port, and then discharges from the A port, and then returns to the hydraulic second oil tank 35 through the third one-way valve 48 and the 4 and 2 ports of the third directional valve 37.

[0064] The longitudinal movement principle of the screed device: the second controller 56 controls the spool of the fifth directional valve 41 to switch to the right position, and the pressure oil source 1 outputs hydraulic oil into the fifth directional valve 41 through the electric proportional speed regulating valve 50, and the pressure oil enters the A port of the second auxiliary drive motor 45 through the oil inlet port 1 and the working oil port 3 of the fifth directional valve 41, drives the second auxiliary drive motor 45 to rotate, and drives the screed device to move longitudinally. The low-pressure oil is discharged from the B port of the second auxiliary drive motor 45, enters the hydraulic second oil tank 35 through the working oil port 4 and the oil return port 2 of the fifth directional valve 41.

[0065] When the controller 24 controls the spool of the fifth directional valve 41 to switch to the left position, the pressure oil at the oil inlet port 1 of the fifth directional valve 41 is cut off, and the fifth directional valve 41 remains stationary.

Claims

1. An electro-hydraulic control system for the smoothing device of a slipform paver, wherein the smoothing device is mounted on a truss that can be moved laterally via a traveling trolley, and a first main drive motor that drives the traveling trolley to move laterally is mounted on the truss, and a first auxiliary drive motor that drives the smoothing device to smooth the concrete pavement in the forward and backward direction is mounted on the traveling trolley. Its features The electro-hydraulic control system includes a first pressure oil source, a first oil tank, a first speed regulating valve, a fourth speed regulating valve, a first reversing valve, a second reversing valve, and a first electro-proportional speed regulating valve. The first speed control valve and the fourth speed control valve are the same, both including a throttle valve, a pressure compensation valve and a first check valve. The oil inlet of the throttle valve is connected to the oil outlet of the first check valve, the oil outlet of the throttle valve is connected to the oil inlet of the pressure compensation valve, and the oil outlet of the pressure compensation valve is connected to the oil inlet of the first check valve. The pressure port of the first directional control valve is connected to the first pressure oil source, the return port is connected to the first oil tank, the first working port is connected to the inlet of the throttle valve in the first speed control valve, the second working port is connected to the inlet of the throttle valve in the fourth speed control valve, the outlet of the pressure compensation valve in the first speed control valve is connected to the oil port A of the first main drive motor, the pilot control ports of the pressure compensation valves in the first and fourth speed control valves are both connected to the pressure port of the first directional control valve, and the oil port B of the first main drive motor is connected to the outlet of the pressure compensation valve in the fourth speed control valve. The pressure port of the second reversing valve is connected to the first pressure oil source via the first electro-proportional speed control valve, the return port is connected to the first oil tank, the first working port is connected to port A of the first auxiliary drive motor, and the second working port is connected to port B of the first auxiliary drive motor; The electro-hydraulic control system also includes a first smoothing device switch and a first controller. The input terminal of the first smoothing device switch is connected to the power supply, and the output terminal is connected to the power supply terminal of the first controller. The first reversing valve, the second reversing valve, and the first electro-proportional speed regulating valve are respectively connected to the output terminal of the first controller. The electro-hydraulic control system further includes a first pressure reducing valve, the inlet and outlet of which are connected in series between the pressure port of the first directional valve and the pressure oil source; the regulating port of the first pressure reducing valve is connected to the first oil tank, and the inlet of the first electro-proportional speed control valve is connected to the inlet of the first pressure reducing valve; The electro-hydraulic control system further includes a first load-sensitive valve, a first safety valve, a second check valve, and a shuttle valve. The inlet of the first load-sensitive valve is connected to the P port of the first pressure oil source, the sensitive port is connected to the outlet of the second check valve and the first oil port of the shuttle valve, and the outlet is connected to the first oil tank. The inlet of the second check valve is connected to the oil port A of the first auxiliary drive motor. The second port of the shuttle valve is connected to port A of the first main drive motor, and the third port is connected to port B of the first main drive motor; the inlet of the first safety valve is connected to port P of the first pressure oil source, and the outlet is connected to the first oil tank.

2. The electro-hydraulic control system of the slipform paver smoothing device according to claim 1, characterized in that... The throttle valve is a manual throttle valve or an electro-proportional throttle valve, and the pressure compensation valve is a normally open pressure compensation valve.

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