A hydraulic control system for a screed

Abstract

This utility model relates to the field of underwater leveling machine technology, specifically to a hydraulic control system for a leveling machine. The hydraulic control system includes: a hydraulic cylinder, a hydraulic motor, a hydraulic pump station, a control unit, and sensors. The hydraulic cylinder and the hydraulic motor are connected to the hydraulic pump station via hydraulic pipelines. The control unit is electrically connected to the hydraulic cylinder, the hydraulic motor, the hydraulic pump station, and the sensors. The hydraulic control system adopts a closed-loop architecture of "hydraulic actuator (hydraulic cylinder + hydraulic motor) - pump station - control unit - sensor," achieving highly integrated control of each component through electrical signal connections. This structure breaks through the limitations of traditional mechanical transmission, making the system layout more compact, and is particularly suitable for the high space utilization requirements of underwater operating equipment.

Description

Technical Field

[0001] This utility model relates to the field of underwater leveling machine technology, and in particular to a hydraulic control system for a leveling machine. Background Technology

[0002] As a key piece of equipment in marine engineering and water conservancy projects, the performance of underwater leveling machines directly affects the construction quality of major projects such as subsea pipeline laying, offshore wind power foundation construction, and reservoir and river dredging. These machines need to perform high-precision leveling operations on soil, sand, or gravel layers in complex underwater environments, which places extremely high demands on the equipment's power output, motion control, and environmental adaptability.

[0003] As a core component of underwater screeds, the hydraulic control system plays an irreplaceable role in ensuring the efficient and stable operation of the equipment. Firstly, the hydraulic system provides stable and reliable power output, ensuring the screed mechanism maintains sufficient operational capability in the high-pressure, high-resistance underwater environment. Secondly, through precise pressure and flow regulation, the hydraulic control system enables refined motion control of the screed mechanism, meeting the high standards of flatness required by various projects. Furthermore, the unique advantages of hydraulic systems, such as high power density and fast response speed, make them particularly suitable for specialized equipment like underwater screeds that require high power output and operate under complex conditions. With the continuous development of marine resources and underwater engineering construction, the requirements for the precision and efficiency of underwater screed operations are increasing, making the performance optimization and technological innovation of hydraulic control systems especially important. Advanced hydraulic control systems not only improve the operational accuracy of screeds but also enhance the equipment's adaptability to complex underwater environments, providing more reliable technical support for various underwater engineering projects. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic control system for a walking underwater screed, so as to achieve efficient and stable operation of the walking underwater screed.

[0005] In a first aspect, this utility model provides a hydraulic control system for a leveling machine. The hydraulic control system includes: a hydraulic cylinder, a hydraulic motor, a hydraulic pump station, a control unit, and sensors. The hydraulic cylinder and the hydraulic motor are connected to the hydraulic pump station via hydraulic lines. The control unit is electrically connected to the hydraulic cylinder, the hydraulic motor, the hydraulic pump station, and the sensors, respectively.

[0006] According to a preferred embodiment, the hydraulic pump station includes: a motor-pump assembly and a relief valve assembly. Both the hydraulic cylinder and the hydraulic motor are equipped with solenoid directional valves. The motor-pump assembly, the relief valve assembly, and the solenoid directional valves are electrically connected to the control unit. The solenoid directional valves are connected to the relief valve assembly via hydraulic pipelines.

[0007] According to a preferred embodiment, the hydraulic cylinder includes a traveling cylinder, a walking support cylinder, a fabric support cylinder, a tilting cylinder, and a lateral movement cylinder. The hydraulic motor includes a main trolley motor and a trolley motor.

[0008] According to a preferred embodiment, the sensor includes a pressure sensor and a displacement sensor. The pressure sensor is disposed on the walking support cylinder and the fabric support cylinder. The displacement sensor is disposed on the walking cylinder, the walking support cylinder, and the fabric support cylinder. The pressure sensor and the displacement sensor are electrically connected to the control unit.

[0009] According to a preferred embodiment, the hydraulic pump station further includes a drain plug, a hydraulic oil tank, a level gauge, an air filter, a suction filter, a return filter, and a high-pressure filter.

[0010] According to a preferred embodiment, both the overflow valve assembly and the solenoid directional valve are provided with an oil outlet and an oil return port. The oil outlet and oil return port provided on the overflow valve assembly are a first oil outlet and a first oil return port, and the oil outlet and oil return port provided on the solenoid directional valve are a second oil outlet and a second oil return port. The first oil outlet is connected to each of the second oil outlets via the high-pressure filter. Each of the second oil return ports is connected to the first oil return port.

[0011] According to a preferred embodiment, there are two of each of the walking cylinder and the tilting cylinder. There are four of each of the walking support cylinder, the fabric support cylinder, and the lateral movement cylinder.

[0012] According to a preferred embodiment, the control unit includes: a PLC basic module, an expansion module, and several indicator lights.

[0013] According to a preferred embodiment, the electrical signal connection is a wired link.

[0014] According to a preferred embodiment, the hydraulic pipeline uses two or more layers of steel wire hydraulic hoses.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The hydraulic control system provided by this utility model adopts a closed-loop architecture of "hydraulic actuator (hydraulic cylinder + hydraulic motor) - hydraulic pump station - control unit - sensor", and achieves highly integrated control of each component through electrical signal connection. This structure breaks through the limitations of traditional mechanical transmission, making the system layout more compact, and is particularly suitable for the high space utilization requirements of underwater operation equipment. Attached Figure Description

[0017] Figure 1This is a connection architecture diagram of the various units of the hydraulic control system;

[0018] Figure 2 This is a hydraulic schematic diagram of a hydraulic control system.

[0019] Figure 3 This is a schematic diagram of the walking frame of a walking underwater leveling machine;

[0020] Figure 4 This is a schematic diagram of the fabric placement frame of a walking underwater screed.

[0021] Figure 5 A schematic diagram showing the connection between the measuring tower and the fabric frame of a walking underwater leveling machine;

[0022] Figure 6 A schematic diagram of the overall assembly structure of a walking underwater leveling machine;

[0023] Figure 7 A schematic diagram of the walking mechanism of a walking underwater leveling machine;

[0024] Figure 8 This is a top view of the overall assembly structure of a walking underwater leveling machine.

[0025] The diagram shows: Solenoid directional valve 101, hydraulic cylinder 110, travel cylinder 111, walking support cylinder 112, fabric support cylinder 113, tilting cylinder 114, lateral movement cylinder 115, hydraulic motor 120, trolley motor 121, trolley motor 122, hydraulic pump station 130, motor pump assembly 131, relief valve assembly 132, control unit 200, sensor 300, pressure sensor 310, displacement sensor 320, and walking frame 410. Walking beam 411, walking longitudinal beam 412, walking hydraulic outrigger 413, placing frame 420, placing beam 421, placing longitudinal beam 422, placing hydraulic outrigger 423, measuring tower 430, tilting telescopic rod 431, traveling mechanism 440, outer frame 441, inner frame 442, lateral telescopic rod 443, traveling telescopic rod 444, placing mechanism 450, placing guide tube 451, transverse guide rail 452, longitudinal guide rail 453, material tube support 454. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0027] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0029] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0030] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0031] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment provides a hydraulic control system for a leveling machine. The hydraulic control system includes: a hydraulic cylinder 110, a hydraulic motor 120, a hydraulic pump station 130, a control unit 200, and a sensor 300. The hydraulic cylinder 110 and the hydraulic motor 120 are connected to the hydraulic pump station 130 via hydraulic lines. The control unit 200 is electrically connected to the hydraulic cylinder 110, the hydraulic motor 120, the hydraulic pump station 130, and the sensor 300.

[0034] The hydraulic control system provided in this embodiment adopts a closed-loop architecture of "hydraulic actuator (hydraulic cylinder 110 + hydraulic motor 120) - hydraulic pump station 130 - control unit 200 - sensor 300". It achieves highly integrated control of each component through electrical signal connection, breaks through the limitations of traditional mechanical transmission, and makes the system layout more compact, which is particularly suitable for the high space utilization requirements of underwater operation equipment.

[0035] Example 2

[0036] This embodiment is a further improvement on Embodiment 1; repeated content will not be described again. See also... Figure 2 The hydraulic pump station 130 includes a motor pump assembly 131 and a relief valve assembly 132. Both the hydraulic cylinder 110 and the hydraulic motor 120 are equipped with solenoid directional valves 101. The motor pump assembly 131, the relief valve assembly 132, and the solenoid directional valves 101 are electrically connected to the control unit 200. The solenoid directional valves 101 and the relief valve assembly 132 are connected via hydraulic lines. Preferably, the hydraulic cylinder 110 includes a travel cylinder 111, a walking support cylinder 112, a fabric support cylinder 113, a tilting cylinder 114, and a lateral movement cylinder 115. The hydraulic motor 120 includes a trolley motor 121 and a trolley motor 122. Preferably, the sensor 300 includes a pressure sensor 310 and a displacement sensor 320. The pressure sensor 310 is mounted on the walking support cylinder 112 and the fabric support cylinder 113. Displacement sensors 320 are mounted on the traveling cylinder 111, the stepping support cylinder 112, and the fabric support cylinder 113. Pressure sensors 310 and 320 are electrically connected to the control unit 200. Preferably, two traveling cylinders 111 and two tilting cylinders 114 are configured. Four stepping support cylinders 112, four fabric support cylinders 113, and four lateral movement cylinders 115 are configured.

[0037] Preferably, the hydraulic lines use two or more layers of steel wire hydraulic hose. Preferably, the hydraulic lines use four layers of steel wire hydraulic hose.

[0038] Preferably, the hydraulic pump station 130 further includes a drain plug, a hydraulic oil tank, a level gauge, an air filter, a suction filter, a return filter, and a high-pressure filter.

[0039] Preferably, both the overflow valve assembly 132 and the solenoid directional valve 101 are provided with an oil outlet and an oil return port. The oil outlet and oil return port provided on the overflow valve assembly 132 are the first oil outlet and the first oil return port, and the oil outlet and oil return port provided on the solenoid directional valve 101 are the second oil outlet and the second oil return port. The first oil outlet is connected to each of the second oil outlets via a high-pressure filter. Each of the second oil return ports is connected to the first oil return port.

[0040] Preferably, the electromagnetic directional valve 101 can be model 4WE6J-61B / G24NZ5L. The overflow valve assembly 132 adopts a stacked overflow valve, specifically model ZDB10-VA-1-L40 / 315. The motor pump assembly 131 has a working pressure of 18MPa, a flow rate of 20L / min, a motor power of 11KW, and a motor operating voltage of 380V, 50Hz.

[0041] Preferably, the control unit 200 includes a PLC basic module, an expansion module, and several indicator lights. Preferably, the electrical signal connection is a wired connection. The PLC basic module can be an SR60. Preferably, the motor pump group 131, the overflow valve group 132, each solenoid directional valve 101, each indicator light, and each sensor 300 are all electrically connected to the PLC basic module. Since the number of functional pins of the PLC basic module is limited, this embodiment introduces an expansion module to increase the peripheral connection capability of the PLC basic module. Preferably, the expansion module adopts the SMART200 series digital expansion module and analog expansion module.

[0042] Each indicator light can be used to indicate the working status of each hydraulic component. For example, whether the motor pump group 131 is started or not, the on / off status of the relief valve group 132, the on / off status of each solenoid directional valve 101, etc.

[0043] Preferably, the control unit 200 is electrically connected to the motor-pump assembly 131, the relief valve assembly 132, and each solenoid directional valve 101. The control unit 200 can adjust the operation of each hydraulic cylinder 110 and each hydraulic motor 120 by controlling the start and stop of the motor-pump assembly 131 and the opening and closing of the relief valve assembly 132 and the solenoid directional valve 101. For example, the control unit 200 can start the motor-pump assembly 131, open the oil outlet of the relief valve assembly 132 and the oil outlet of the solenoid directional valve 101 on the hydraulic motor 120, so that the hydraulic pump station 130 pumps hydraulic oil to the hydraulic motor 120.

[0044] For hydraulic components requiring precise control, the control unit 200 can adjust the start / stop of the motor pump assembly 131 and the on / off state of the relief valve assembly 132 and the solenoid directional valve 101 based on the sensing data from its configured sensors 300. For example, the control unit 200 can start the motor pump assembly 131, open the oil outlet of the relief valve assembly 132 and the oil outlet of the solenoid directional valve 101 on the fabric support cylinder 113, so that the hydraulic pump station 130 pumps hydraulic oil to the fabric support cylinder 113; then, the control unit 200 can regulate the on / off state of the relief valve assembly 132 and the solenoid directional valve 101 on the fabric support cylinder 113 based on the sensing data from the pressure sensor 310 and the displacement sensor 320 on the fabric support cylinder 113, to determine whether to pump hydraulic oil to the fabric support cylinder 113 or to extract hydraulic oil from the fabric support cylinder 113.

[0045] See Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The walking underwater leveling machine includes: a walking frame 410, a material placement frame 420, a measuring tower 430, a walking mechanism 440, and a material placement mechanism 450.

[0046] See Figure 3 The walking frame 410 includes two walking crossbeams 411, two walking longitudinal beams 412, and four walking hydraulic outriggers 413. The two walking crossbeams 411 and the two walking longitudinal beams 412 combine to form a rectangular walking frame 410. The walking hydraulic outriggers 413 are mounted on the walking longitudinal beams 412 and located near the walking crossbeams 411. The walking support cylinder 112 drives the extension and retraction of the walking hydraulic outriggers 413.

[0047] See Figure 4 The fabric frame 420 includes two fabric crossbeams 421, two fabric longitudinal beams 422, and four fabric hydraulic outriggers 423.

[0048] Two fabric crossbeams 421 and two fabric longitudinal beams 422 combine to form a rectangular fabric frame 420. The fabric crossbeams 421 and fabric longitudinal beams 422 are connected by a traveling mechanism 440. Fabric hydraulic outriggers 423 are mounted on the fabric crossbeams 421 and located near the fabric longitudinal beams 422. Fabric support cylinders 113 drive the extension and retraction of the fabric hydraulic outriggers 423.

[0049] See Figure 5 and Figure 6The walking underwater leveling machine is equipped with two measuring towers 430. The measuring towers 430 are hinged to the fabric frame 420, and the tilting telescopic rods 431 are hinged to both the measuring towers 430 and the fabric frame 420. The tilting telescopic rods 431 extend and retract, causing the measuring towers 430 to rotate around the hinge point between them. A tilting cylinder 114 drives the extension and retraction of the tilting telescopic rods 431.

[0050] See Figure 4 , Figure 6 and Figure 7 The traveling mechanism 440 includes an outer frame 441, an inner frame 442, a transverse telescopic rod 443, and a traveling telescopic rod 444.

[0051] The inner frame 442 is located inside the outer frame 441, and the inner frame 442 and the outer frame 441 are connected by a transverse telescopic rod 443. The transverse telescopic rod 443 extends and retracts, causing the inner frame 442 to reciprocate inside the outer frame 441. The transverse hydraulic cylinder 115 drives the extension and retraction of the transverse telescopic rod 443.

[0052] One side of the outer wall of the inner frame 442 is connected to the fabric crossbeam 421, and one side of the open end face of the inner frame 442 is connected to the fabric longitudinal beam 422.

[0053] The inner frame 442 is fitted onto the walking longitudinal beam 412. The outer wall of the inner frame 442 is connected to the side wall of the walking longitudinal beam 412 via a traveling telescopic rod 444. The traveling telescopic rod 444 extends and retracts along the length of the walking longitudinal beam 412. The extension and retraction of the traveling telescopic rod 444 causes the walking longitudinal beam 412 to slide against the fabric frame 420 along its length, thus enabling the walking underwater leveler to move along the length of the walking longitudinal beam 412. The traveling cylinder 111 drives the extension and retraction of the traveling telescopic rod 444.

[0054] The inner frame 442 is fitted onto the walking longitudinal beam 412. The lateral telescopic rod 443 extends and retracts to enable the walking underwater leveler to move along the length of the walking crossbeam 411.

[0055] The walking underwater leveling machine is equipped with four walking mechanisms 440, two of which are not equipped with travel telescopic rods 444. Preferably, the two walking mechanisms 440 without travel telescopic rods 444 are respectively mounted on two walking longitudinal beams 412.

[0056] See Figure 6 and Figure 8 The fabric feeding mechanism 450 includes a fabric guide tube 451, a transverse guide rail 452, a longitudinal guide rail 453, a material tube support 454, a trolley motor 121, and a trolley motor 122.

[0057] Two transverse guide rails 452 are respectively arranged along the length of the two fabric crossbeams 421. Two longitudinal guide rails 453 are arranged in parallel, and the two ends of the two longitudinal guide rails 453 are slidably connected to the two transverse guide rails 452. A feed tube support 454 is slidably connected to the two longitudinal guide rails 453. The feed tube support 454 is used to place the fabric guide tube 451. The fabric guide tube 451 can be engaged with the feed tube support 454. A trolley motor 121 is set on one of the longitudinal guide rails 453, and the trolley motor 121 can drive the two longitudinal guide rails 453 to reciprocate along the length of the transverse guide rails 452. A trolley motor 122 is set on the feed tube support 454, and is used to drive the feed tube support 454 to reciprocate along the length of the longitudinal guide rails 453. The trolley motor 122 and the trolley motor 121 can drive the object to slide along the guide rails in a conventional worm gear drive, ball screw drive, or other sliding method using motors and guide rails.

[0058] The hydraulic control system provided in this embodiment can regulate the various hydraulic actuators in the walking underwater leveling machine, specifically including:

[0059] Adjusting the walking cylinder 111 drives the extension and retraction of the walking telescopic rod 444, enabling the walking underwater leveling machine to move along the length of the walking longitudinal beam 412.

[0060] Adjust the walking support cylinder 112 to drive the extension and retraction of the walking hydraulic outrigger 413;

[0061] Adjust the fabric support cylinder 113 to drive the extension and retraction of the fabric hydraulic support leg 423;

[0062] Adjust the tilting cylinder 114 to drive the tilting telescopic rod 431 to extend and retract, so that the measuring tower 430 rotates around the hinge point between the measuring tower 430 and the cloth frame 420.

[0063] Adjusting the transverse hydraulic cylinder 115 drives the extension and retraction of the transverse telescopic rod 443, thereby enabling the walking underwater leveling machine to move along the length of the walking beam 411.

[0064] The trolley motor 121 is adjusted to drive the two longitudinal guide rails 453 to reciprocate along the length of the transverse guide rail 452.

[0065] The trolley motor 122 is adjusted to drive the material tube support 454 to reciprocate along the longitudinal guide rail 453.

[0066] In this embodiment, the specific control of the walking cylinder 111, the walking support cylinder 112, the fabric support cylinder 113, the tilting cylinder 114, the lateral movement cylinder 115, the trolley motor 121, and the trolley motor 122 is as follows: The control unit 200 is electrically connected to the motor pump group 131, the overflow valve group 132, and each solenoid directional valve 101. The control unit 200 can adjust the flow of hydraulic oil in each hydraulic actuator by controlling the start and stop of the motor pump group 131 and the opening and closing of the overflow valve group 132 and the solenoid directional valve 101, so as to achieve the desired working state. For hydraulic actuators such as the walking support cylinder 112 and the fabric support cylinder 113 that require precise control, this embodiment is equipped with sensors 300 such as pressure sensor 310 and displacement sensor 320. The control unit 200 can adjust the start and stop of the motor pump group 131 and the on / off state of the overflow valve group 132 and the solenoid directional valve 101 according to the sensing data of the configured sensors 300, so as to achieve the desired working state.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic control system for a screed, characterized by, include: Hydraulic cylinder (110), hydraulic motor (120), hydraulic pump station (130), control unit (200) and sensor (300); The hydraulic cylinder (110) and the hydraulic motor (120) are connected to the hydraulic pump station (130) via hydraulic lines; The control unit (200) is electrically connected to the hydraulic cylinder (110), the hydraulic motor (120), the hydraulic pump station (130), and the sensor (300), respectively.

2. A hydraulic control system for a screed as defined in claim 1, wherein, The hydraulic pump station (130) includes: a motor pump group (131) and a relief valve group (132); the hydraulic cylinder (110) and the hydraulic motor (120) are both equipped with electromagnetic directional valves (101); The motor pump assembly (131), the overflow valve assembly (132), and the electromagnetic reversing valve (101) are electrically connected to the control unit (200); The electromagnetic directional valve (101) and the overflow valve group (132) are connected by hydraulic lines.

3. A hydraulic control system for a screed as defined in claim 2, wherein, The hydraulic cylinder (110) includes a walking cylinder (111), a walking support cylinder (112), a fabric support cylinder (113), a tilting cylinder (114), and a lateral movement cylinder (115); The hydraulic motor (120) includes: a trolley motor (121) and a trolley motor (122).

4. A hydraulic control system for a screed as defined in claim 3, wherein, The sensor (300) includes: a pressure sensor (310) and a displacement sensor (320); The pressure sensor (310) is mounted on the walking support cylinder (112) and the fabric support cylinder (113); The displacement sensor (320) is installed on the walking cylinder (111), the walking support cylinder (112), and the fabric support cylinder (113); The pressure sensor (310) and the displacement sensor (320) are electrically connected to the control unit (200).

5. A hydraulic control system for a screed as defined in claim 2, wherein, The hydraulic pump station (130) also includes a drain plug, a hydraulic oil tank, a level gauge, an air filter, a suction filter, a return filter, and a high-pressure filter.

6. A hydraulic control system for a screed as defined in claim 5, wherein, Both the overflow valve assembly (132) and the solenoid directional valve (101) are provided with an oil outlet and an oil return port. The oil outlet and oil return port provided on the overflow valve assembly (132) are the first oil outlet and the first oil return port, and the oil outlet and oil return port provided on the solenoid directional valve (101) are the second oil outlet and the second oil return port. The first oil outlet is connected to each of the second oil outlets via the high-pressure filter; each of the second oil return ports is connected to the first oil return port.

7. A hydraulic control system for a leveling machine according to claim 3, characterized in that, Both the traveling cylinder (111) and the tilting cylinder (114) are configured in pairs; The walking support cylinder (112), the fabric support cylinder (113), and the lateral movement cylinder (115) are all configured in fours.

8. A hydraulic control system for a screed as defined in claim 4, wherein, The control unit (200) includes: a PLC basic module, an expansion module, and several indicator lights.

9. A hydraulic control system for a screed as defined in claim 4, wherein, The electrical signal connection is a wired connection.

10. A hydraulic control system for a screed as defined in claim 1, wherein, The hydraulic pipeline uses two or more layers of steel wire hydraulic hoses.

Images