A hydraulic control system and control method for a screen cleaning all-in-one machine chassis

Abstract

The application provides a hydraulic control system and control method for a bottom plate of a screen cleaning integrated machine, and the system comprises a track hydraulic control unit, a rail wheel hydraulic control unit and a rail wheel lifting cylinder, a rail wheel floating pilot valve, a rail wheel walking switch valve, a rail wheel unlocking valve and a shuttle valve; the rail wheel hydraulic control unit comprises a hydraulic motor, a hydraulic motor control valve and a wheel rail brake; the system further comprises the rail wheel walking switch valve and the cylinder control valve connected in series at an oil port, which are used for switching high-pressure oil to the rail wheel hydraulic control unit or the track hydraulic control unit; the rail wheel floating pilot valve is connected with a third oil port of the shuttle valve and a pilot oil port of a rail wheel floating hydraulic control valve; the rail wheel unlocking valve is connected with a second oil port of the shuttle valve, and a first oil port of the shuttle valve is connected with the wheel rail brake; when the rail wheel floating pilot valve is powered, the wheel rail brake releases the brake on the hydraulic motor, and the two oil ports of the hydraulic motor are communicated to make the rail wheel driving device float; and the application can effectively control different walking modes of the bottom plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic technology of construction machinery, and particularly relates to a hydraulic control system and control method of a bottom plate of a screen cleaning and sorting integrated machine. BACKGROUND

[0002] The screen cleaning and sorting integrated machine has two actions of driving the mechanical system to walk down:

[0003] The first action: when walking on the ground, the track driving device is used to drive walking, the driving force is large, and the requirement for the road surface is low;

[0004] The second action: when working on the track, the rubber pads are attached to the steel track to walk on the guide rail, the rail wheel lifting cylinder falls to make the rail wheel driving device fall in the middle of the steel rail to play a guiding role; when the rail wheel lifting cylinder continues to fall, the track is lifted to separate from the steel rail, and the rail wheel driving device is used to drive walking on the steel rail.

[0005] For the first action, the rail wheel needs to be lifted or positioned and guided when the track walks, that is, the rail wheel needs to be in a floating state; for the second action, the track is lifted, and the rail wheel driving needs to be controlled in various working conditions of the wheel rail to meet the actual needs.

[0006] Therefore, a hydraulic control system and control method of a bottom plate of a screen cleaning and sorting integrated machine are needed, which can effectively control the screen cleaning and sorting integrated machine in different walking modes. SUMMARY

[0007] The purpose of the present application is to provide a hydraulic control system and control method of a bottom plate of a screen cleaning and sorting integrated machine, which aims to solve the technical problem that the traditional bottom plate hydraulic control system cannot effectively control the different walking modes of the bottom plate.

[0008] To achieve the above purpose, in the first aspect, the present application provides a hydraulic control system of a bottom plate of a screen cleaning and sorting integrated machine, which comprises a track hydraulic control unit for controlling track walking, a rail wheel hydraulic control unit for controlling rail wheel walking, a rail wheel lifting cylinder for executing rail wheel lifting, and a rail wheel floating hydraulic control valve, a rail wheel floating pilot valve, a rail wheel walking switching valve, a rail wheel unlocking valve, a cylinder control valve and a shuttle valve;

[0009] The rail wheel hydraulic control unit comprises a hydraulic motor, a hydraulic motor control valve connected with two working oil ports of the hydraulic motor, and a wheel rail brake for braking the hydraulic motor;

[0010] The oil port of the rail wheel walking switching valve and the cylinder control valve is connected in series, which is used to switch the oil supply of the central swivel joint to the rail wheel hydraulic control unit or the track hydraulic control unit;

[0011] The working oil port of the rail wheel floating pilot valve is connected with the third oil port of the shuttle valve and the pilot oil port of the rail wheel floating hydraulic control valve;

[0012] The working oil port of the rail wheel unlocking valve is connected with the second oil port of the shuttle valve, and the first oil port of the shuttle valve is connected with the rail wheel brake;

[0013] When the rail wheel floating pilot valve is powered, the rail wheel brake releases the brake on the hydraulic motor, the rail wheel floating hydraulic control valve is in the second working position, and the two oil ports of the hydraulic motor are connected through the rail wheel floating hydraulic control valve to make the rail wheel driving device in the floating state;

[0014] The rail wheel unlocking valve is used to control the brake / contactor brake of the rail wheel brake on the hydraulic motor during the rail wheel walking.

[0015] As a further improvement of the above scheme, the rail wheel floating hydraulic control valve is a two-position six-way hydraulic control valve, the first oil port of which is connected with the A oil port of the left hydraulic motor, the second oil port of which is connected with the A oil port of the right hydraulic motor, the fifth oil port of which is connected with the B oil port of the left hydraulic motor, and the sixth oil port of which is connected with the B oil port of the right hydraulic motor;

[0016] When the rail wheel floating hydraulic control valve is in the first working position, the first oil port and the third oil port thereof are connected, the second oil port and the fourth oil port thereof are connected, and the fifth oil port, the sixth oil port and the remaining oil ports are not connected with each other;

[0017] When the rail wheel floating hydraulic control valve is in the second working position, the first oil port and the fifth oil port thereof are connected, the second oil port and the sixth oil port thereof are connected, and the third oil port and the fourth oil port thereof are not connected with the remaining oil ports.

[0018] As a further improvement of the above scheme, the rail wheel walking switching valve and the oil cylinder control valve are both two-position six-way electromagnetic valves, the first oil port and the second oil port of the rail wheel walking switching valve are respectively connected with the corresponding oil supply ports of the central rotary joint, the third oil port thereof is connected with the first oil port of the oil cylinder control valve, the fourth oil port thereof is connected with the second oil port of the oil cylinder control valve, the fifth oil port thereof is connected with the first oil port of the rail wheel hydraulic control unit, and the sixth oil port thereof is connected with the second oil port of the rail wheel hydraulic control unit;

[0019] The third oil port of the oil cylinder control valve is connected with the first oil port of the track hydraulic control unit, the fourth oil port thereof is connected with the second oil port of the track hydraulic control unit, the fifth oil port thereof is connected with the rod cavity of the rail wheel lifting oil cylinder, and the sixth oil port thereof is connected with the rodless cavity of the rail wheel lifting oil cylinder.

[0020] As a further improvement of the above scheme, when both the track-wheel walking switch valve and the oil cylinder control valve are not powered, both valves are in the first working position, and the central swivel joint supplies oil to the track hydraulic control unit, and the hydraulic oil in the track-wheel hydraulic control unit returns to the oil tank through the oil drain oil way.

[0021] When both the track-wheel walking switch valve and the oil cylinder control valve are powered, both valves are in the second working position, and the central swivel joint supplies oil to the track-wheel hydraulic control unit, and the hydraulic oil in the track hydraulic control unit returns to the oil tank through the oil drain oil way.

[0022] When the track-wheel walking switch valve is not powered and is in the first working position, and the oil cylinder control valve is powered and is in the second working position, the central swivel joint supplies oil to the track-wheel lifting oil cylinder.

[0023] As a further improvement of the above scheme, when both the track-wheel walking switch valve and the oil cylinder control valve are in the first working position:

[0024] The first oil port of the track-wheel walking switch valve is in communication with the third oil port of the track-wheel walking switch valve, and the first oil port of the oil cylinder control valve is in communication with the third oil port of the oil cylinder control valve.

[0025] The second oil port of the track-wheel walking switch valve is in communication with the fourth oil port of the track-wheel walking switch valve, and the second oil port of the oil cylinder control valve is in communication with the fourth oil port of the oil cylinder control valve.

[0026] The fifth oil port of the track-wheel walking switch valve, the sixth oil port of the track-wheel walking switch valve, the fifth oil port of the oil cylinder control valve, and the sixth oil port of the oil cylinder control valve are all not in communication with the remaining oil ports.

[0027] When both the track-wheel walking switch valve and the oil cylinder control valve are in the second working position:

[0028] The first oil port of the track-wheel walking switch valve is in communication with the fifth oil port of the track-wheel walking switch valve, and the first oil port of the oil cylinder control valve is in communication with the fifth oil port of the oil cylinder control valve.

[0029] The second oil port of the track-wheel walking switch valve is in communication with the sixth oil port of the track-wheel walking switch valve, and the second oil port of the oil cylinder control valve is in communication with the sixth oil port of the oil cylinder control valve.

[0030] The third oil port of the track-wheel walking switch valve, the fourth oil port of the track-wheel walking switch valve, the third oil port of the oil cylinder control valve, and the fourth oil port of the oil cylinder control valve are all not in communication with the remaining oil ports.

[0031] As a further improvement of the above-mentioned scheme, a two-position two-way electromagnetic valve is further arranged between the first oil port of the shuttle valve and the wheel rail brake.

[0032] As a further improvement of the above-mentioned scheme, a balance valve is arranged at the oil inlet of the rail wheel lifting oil cylinder.

[0033] In a second aspect, the application further provides a control method of the hydraulic control system of the screen cleaning and screening integrated machine chassis provided in the first aspect, and the steps include:

[0034] S1, when the crawler drives the walking:

[0035] First, the rail wheel driving device is in an automatic floating state, and then the rail wheel walking switching valve and the oil cylinder control valve are both de-energized, so that both valves are in the first working position, and the crawler hydraulic control unit is supplied with oil through the central rotary joint to make the crawler walk;

[0036] S2, when the rail wheel driving device drives the walking:

[0037] S21, first, the floating state of the rail wheel driving device is released, and the wheel rail brake brakes the hydraulic motor; then, the rail wheel lifting oil cylinder is controlled to lower the rail wheel driving device, so that the rail wheel driving device is in a parking brake state;

[0038] S22, when the control handle drives the rail wheel driving device to walk, the pilot signal of the handle makes the rail wheel unlocking valve energized, and the pilot control oil opens the corresponding wheel rail brake through the shuttle valve to release the brake on the rail wheel driving device; the handle pilot signal controls the rail wheel walking switching valve to supply the rail wheel hydraulic control unit with oil to make the rail wheel driving device walk;

[0039] S23, when parking is needed, the control handle is completely closed, the pilot pressure is zeroed after a delay of a preset time, and then the rail wheel unlocking valve is de-energized after the hydraulic motor is preliminarily braked, so that the wheel rail brake brakes the hydraulic motor, and the rail wheel driving device returns to the parking brake state.

[0040] As a further improvement of the above-mentioned scheme, in step S1, the method steps for making the rail wheel driving device in an automatic floating state are as follows:

[0041] The rail wheel floating pilot valve is energized, the pilot control oil opens the corresponding wheel rail brake through the shuttle valve, and at the same time, the pilot control oil pushes the rail wheel floating hydraulic control valve to the second working position, so that the two working oil ports of the left and right hydraulic motors for driving the rail wheel are in a communication state through the rail wheel floating hydraulic control valve, and the rail wheel driving device is in an automatic floating state.

[0042] As a further improvement of the above-mentioned scheme, in step S21, the method steps for releasing the floating state of the rail wheel driving device are as follows:

[0043] The rail wheel floating pilot valve is controlled to lose electricity, the pilot control oil is cut off, the rail wheel brake is in a locked state, the rail wheel floating hydraulic control valve is in a first working position, and the communication state of the two working oil ports of the left and right hydraulic motors is cut off.

[0044] As a further improvement of the above scheme, in step S21, the method for controlling the rail wheel lifting cylinder to lower the rail wheel driving device is as follows:

[0045] The rail wheel walking switch valve loses electricity and is in a first working position, and the cylinder control valve obtains electricity and is in a second working position, so that the high-pressure oil in the central rotating joint oil supply port is supplied to the rail wheel lifting cylinder through the corresponding oil ports of the rail wheel walking switch valve and the cylinder control valve to lower the rail wheel to a specified position.

[0046] As a further improvement of the above scheme, in step S22, the method for controlling the rail wheel walking switch valve to supply oil to the rail wheel hydraulic control unit is as follows:

[0047] When the rail wheel walking switch valve obtains electricity, it is in a second working position, and the cylinder control valve loses electricity and is in a first working position; the central rotating joint oil supply port supplies oil to the rail wheel hydraulic control unit, and the hydraulic oil in the track hydraulic control unit is returned to the oil tank through the oil drain oil circuit.

[0048] Due to the above technical scheme, the present application has the following beneficial effects:

[0049] 1、The hydraulic control system of the screen cleaning all-in-one machine chassis provided by the present application realizes the switching control of the oil circuit of the track hydraulic control unit and the track hydraulic control unit through the oil port series connection of the rail wheel walking switch valve and the cylinder control valve, so that the switching of different walking modes of the chassis is realized; in order to achieve better control, the rail wheel floating pilot valve, the rail wheel floating hydraulic control valve and the shuttle valve are further provided, the rail wheel floating pilot valve is connected with the corresponding oil ports of the rail wheel floating hydraulic control valve and the shuttle valve respectively, the pilot control oil opens the rail wheel brake of the hydraulic motor of the rail wheel driving device through the shuttle valve, and the pilot control oil drives the rail wheel floating hydraulic control valve to move to the corresponding working position, so that the two working oil ports of the hydraulic motor are in a communication state through the rail wheel floating hydraulic control valve, so that the rail wheel driving device can be in a free floating state; additionally, the rail wheel unlocking valve is further provided, and the rail wheel unlocking valve can control the opening of the rail wheel brake when the rail wheel driving device is walking, so as to effectively brake or start the walking of the chassis; specifically, when the chassis is stationary, the rail wheel unlocking valve controls the locking of the rail wheel brake, so as to realize the braking and parking of the rail wheel when the rail wheel is stationary; the rail wheel brake is started and opened in time when the rail wheel is walking. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in these drawings without any creative effort.

[0051] Figure 1 Figure 1 is a schematic diagram of a hydraulic control system of a screen cleaning integrated machine chassis disclosed by the present application.

[0052] Figure 2 Figure 1 is a schematic diagram of a hydraulic control system of a screen cleaning integrated machine chassis disclosed by the present application. Figure 1 Figure 1 is a schematic diagram of a hydraulic control system of a screen cleaning integrated machine chassis disclosed by the present application.

[0053] Reference signs:

[0054] 1, track hydraulic control unit; 2, rail wheel hydraulic control unit; 21, hydraulic motor; 22, hydraulic motor control valve; 23, wheel rail brake; 3, rail wheel lifting cylinder; 4, rail wheel floating hydraulic control valve; 5, rail wheel floating pilot valve; 6, rail wheel walking switching valve; 7, rail wheel unlocking valve; 8, cylinder control valve; 9, shuttle valve.

[0055] The implementation of the purpose of the present application, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0057] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0058] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0059] And, the technical solutions among various embodiments of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the protection scope claimed by the present application.

[0060] Embodiment 1

[0061] Referring to Figure 1 And Figure 2 The present application provides a hydraulic control system of a screen cleaning integrated machine chassis, comprising a track hydraulic control unit 1 for controlling track walking, a rail wheel hydraulic control unit 2 for controlling rail wheel walking, and a rail wheel lifting cylinder 3 for executing rail wheel lifting, and a rail wheel floating hydraulic control valve 4, a rail wheel floating pilot valve 5, a rail wheel walking switching valve 6, a rail wheel unlocking valve 7, a cylinder control valve 8 and a shuttle valve 9;

[0062] It should be noted that the screen cleaning integrated machine chassis comprises left and right walking tracks, and rail wheel driving devices are arranged at both ends of each walking track and symmetrically arranged on the left and right sides. In order to clearly illustrate the inventive concept of the present application, the hydraulic control system of any side is taken as an example for description;

[0063] The rail wheel hydraulic control unit 2 comprises a hydraulic motor 21, a hydraulic motor control valve 22 connected with two working oil ports of the hydraulic motor 21, and a rail wheel brake 23 for braking the hydraulic motor 21;

[0064] The oil port of the rail wheel walking switching valve 6 and the cylinder control valve 8 is connected in series, for switching the oil supply of the central rotary joint to the rail wheel hydraulic control unit 2 or the track hydraulic control unit 1;

[0065] The working oil port of the rail wheel floating pilot valve 5 is connected with the third oil port of the shuttle valve 9, and also connected with the pilot oil port of the rail wheel floating hydraulic control valve 4;

[0066] The working oil port of the rail wheel unlocking valve 7 is connected with the second oil port of the shuttle valve 9, and the first oil port of the shuttle valve 9 is connected with the rail wheel brake 23;

[0067] When the rail wheel floating pilot valve 5 is powered, the rail wheel brake 23 releases the brake of the hydraulic motor 21, the rail wheel floating hydraulic control valve 4 is in the second working position, and the two oil ports of the hydraulic motor 21 are communicated through the rail wheel floating hydraulic control valve 4, so that the rail wheel driving device is in a floating state;

[0068] The rail wheel unlocking valve 7 is used for controlling the brake / contactor brake of the rail wheel brake 23 on the hydraulic motor 21 when the rail wheel walks;

[0069] The application realizes the switching control of the oil path of the track hydraulic control unit 2 and the track hydraulic control unit 2 by the series connection of the track wheel walking switching valve 6 and the oil cylinder control valve 8, so as to realize the switching of different walking modes of the chassis; in order to achieve better control, the application further provides the track wheel floating pilot valve 5, the track wheel floating hydraulic control valve 4 and the shuttle valve 9, the track wheel floating pilot valve 5 is connected with the corresponding oil ports of the track wheel floating hydraulic control valve 4 and the shuttle valve 9 respectively, the pilot control oil opens the track rail brake 23 of the hydraulic motor 21 of the track wheel driving device through the shuttle valve 9, and simultaneously pushes the track wheel floating hydraulic control valve 4 to move to the corresponding working position, so that the two working oil ports of the hydraulic motor 21 are in the communication state through the track wheel floating hydraulic control valve 4, thereby the track wheel driving device can be in the free floating state; meanwhile, the track wheel unlocking valve 7 is additionally provided, the setting of the track wheel unlocking valve 7 can realize the opening of the track rail brake 23 through the track wheel unlocking valve 7 when the track wheel driving device walks, so as to facilitate the effective braking or starting walking of the chassis, specifically, when the chassis is static, the track wheel unlocking valve 7 controls the track rail brake 23 to be locked, so as to realize the braking and parking when the track wheel is static; the track rail brake 23 is started and opened in time when the track wheel walks.

[0070] As a preferred embodiment, the track wheel floating hydraulic control valve 4 is a two-position six-way hydraulic control valve, the first oil port is connected with the A oil port of the hydraulic motor 21 of the left track wheel driving device, the second oil port is connected with the A oil port of the hydraulic motor 21 of the right track wheel driving device, the fifth oil port is connected with the B oil port of the hydraulic motor 21 of the left track wheel driving device, and the sixth oil port is connected with the B oil port of the hydraulic motor 21 of the right track wheel driving device;

[0071] When the track wheel floating hydraulic control valve 4 is in the first working position, the first oil port and the third oil port are communicated, the second oil port and the fourth oil port are communicated, and the fifth oil port, the sixth oil port and the remaining oil ports are not communicated with each other; the two working oil ports of the two hydraulic motors 21 are in the cut-off state.

[0072] When the track wheel floating hydraulic control valve 4 is in the second working position, the first oil port and the fifth oil port are communicated, the second oil port and the sixth oil port are communicated, and the third oil port and the fourth oil port are not communicated with the remaining oil ports; that is, when the track wheel floating hydraulic control valve 4 is in the second working position, the left hydraulic motor 21 is communicated through the first oil port and the fifth oil port of the track wheel floating hydraulic control valve 4, so that the left track wheel driving device is in the free floating state; the right hydraulic motor 21 is communicated through the second oil port and the sixth oil port of the track wheel floating hydraulic control valve 4, so that the right track wheel driving device is in the free floating state.

[0073] In the present application, by reasonably connecting the rail wheel floating pilot valve 5 with the shuttle valve 9 and the pilot oil port of the rail wheel floating hydraulic control valve 4, while releasing the brake of the hydraulic motor 21 by the rail-wheel brake 23, the pilot control oil provided by the rail wheel floating pilot valve 5 pushes the movement of the spool of the rail wheel floating hydraulic control valve 4, so that the two working oil ports of the hydraulic motor 21 are communicated through the rail wheel floating hydraulic control valve 4, so that the rail-wheel driving device is in a free floating state.

[0074] As a preferred embodiment, the rail wheel walking switch valve 6 and the oil cylinder control valve 8 are both two-position six-way electromagnetic valves, the first oil port and the second oil port of the rail wheel walking switch valve 6 are connected with the corresponding oil supply ports of the central rotary joint respectively, the third oil port is connected with the first oil port of the oil cylinder control valve 8, the fourth oil port is connected with the second oil port of the oil cylinder control valve 8, the fifth oil port is connected with the first oil port of the rail-wheel hydraulic control unit 2, and the sixth oil port is connected with the second oil port of the rail-wheel hydraulic control unit 2;

[0075] The third oil port of the oil cylinder control valve 8 is connected with the first oil port of the track hydraulic control unit 1, the fourth oil port is connected with the second oil port of the track hydraulic control unit 1, the fifth oil port is connected with the rod cavity of the rail-wheel lifting oil cylinder 3, and the sixth oil port is connected with the rodless cavity of the rail-wheel lifting oil cylinder 3;

[0076] When the rail wheel walking switch valve 6 and the oil cylinder control valve 8 are in the first working position, the first oil port and the third oil port thereof are communicated, the second oil port and the fourth oil port thereof are communicated, and the fifth oil port and the sixth oil port thereof are not communicated with the remaining oil ports;

[0077] When the rail wheel walking switch valve 6 and the oil cylinder control valve 8 are in the second working position, the first oil port and the fifth oil port thereof are communicated, the second oil port and the sixth oil port thereof are communicated, and the third oil port and the fourth oil port thereof are not communicated with the remaining oil ports;

[0078] When the rail wheel walking switch valve 6 and the oil cylinder control valve 8 are both not powered, both valves are in the first working position, the track hydraulic control unit 1 is supplied with oil through the central rotary joint, and the hydraulic oil in the rail-wheel hydraulic control unit 2 returns to the oil tank through the oil drain oil circuit; specifically, the pressure oil enters the first oil port of the rail wheel walking switch valve 6 through the first oil supply port of the central rotary joint, then flows out through the third oil port and enters the first oil port of the oil cylinder control valve 8, then enters the first oil port of the track hydraulic control unit 1 through the third oil port of the oil cylinder control valve 8 to provide pressure oil for the track hydraulic control unit 1, while the low-pressure oil flows out through the second oil port of the track hydraulic control unit 1, then enters the fourth oil port of the oil cylinder control valve 8 and flows out through the second oil port, then enters the fourth oil port of the rail wheel walking switch valve 6 and flows out through the second oil port to enter the second oil port of the central rotary joint and return to the oil tank.

[0079] When the rail wheel running switch valve 6 and the oil cylinder control valve 8 are both powered, both valves are in the second working position, and the central rotary joint supplies oil to the rail wheel hydraulic control unit 2, and the hydraulic oil in the track hydraulic control unit 1 returns to the oil tank through the oil drain oil way; specifically, the pressure oil enters the first oil port of the rail wheel running switch valve 6 through the first oil supply port of the central rotary joint, then flows out through the fifth oil port thereof and enters the first oil port of the rail wheel hydraulic control unit 2 to provide pressure oil for the rail wheel hydraulic control unit 2, and at the same time, the low-pressure oil flows out through the second oil port of the rail wheel hydraulic control unit 2, then enters the sixth oil port of the rail wheel running switch valve 6, and flows out through the second oil port thereof to enter the second oil port of the central rotary joint and return to the oil tank; the hydraulic oil in the track hydraulic control unit 1 is drained to the oil tank through the fifth oil port and the sixth oil port of the oil cylinder control valve 8, respectively.

[0080] When the rail wheel running switch valve 6 is not powered and is in the first working position, and the oil cylinder control valve 8 is powered and is in the second working position, the central rotary joint supplies oil to the rail wheel lifting cylinder 3; specifically, the pressure oil enters the first oil port of the rail wheel running switch valve 6 through the first oil supply port of the central rotary joint, then flows out through the third oil port thereof and enters the first oil port of the oil cylinder control valve 8, and then enters the rod cavity of the rail wheel lifting cylinder through the fifth oil port of the oil cylinder control valve 8; similarly, the pressure oil enters the second oil port of the rail wheel running switch valve 6 through the second oil supply port of the central rotary joint, then flows out through the fourth oil port thereof and enters the second oil port of the oil cylinder control valve 8, and then enters the rodless cavity of the rail wheel lifting cylinder through the sixth oil port of the oil cylinder control valve 8.

[0081] As a preferred embodiment, a two-position two-way electromagnetic valve is further arranged between the first oil port of the shuttle valve 9 and the rail brake 23, and the two-position two-way electromagnetic valve is de-energized to realize the braking of the rail brake 23 by the movement of the shuttle valve 9.

[0082] As a preferred embodiment, the oil inlet of the rail wheel lifting cylinder 3 is provided with balance valves that are pilot-controlled with each other.

[0083] Embodiment 2

[0084] The application further provides a control method of the hydraulic control system of the screen cleaning and screening integrated machine chassis provided in Embodiment 1, and the steps of the control method include:

[0085] S1, when the track is driven to run:

[0086] First, the rail wheel driving device is in an automatic floating state, and then the rail wheel running switch valve 6 and the oil cylinder control valve 8 are both de-energized, and both valves are in the first working position, and the central rotary joint supplies oil to the track hydraulic control unit 1 to make the track run;

[0087] The method steps for making the rail wheel driving device in automatic floating state are as follows:

[0088] The rail wheel floating pilot valve 5 is powered on, the pilot control oil opens the corresponding rail brake 23 through the shuttle valve 9, and at the same time, the pilot control oil pushes the rail wheel floating hydraulic control valve 4 to the second working position, and the two working oil ports of the left and right hydraulic motors 21 for driving the rail wheel are in communication state through the rail wheel floating hydraulic control valve 4, so that the rail wheel driving device is in automatic floating state;

[0089] S2, when the rail wheel driving device is driving:

[0090] S21, first release the floating state of the rail wheel driving device, and the rail brake 23 brakes the hydraulic motor 21; then control the rail wheel lifting cylinder 3 to act to lower the rail wheel driving device, so that the rail wheel driving device is in parking brake state;

[0091] The method steps for releasing the floating state of the rail wheel driving device are as follows:

[0092] First, control the rail wheel floating pilot valve 5 to lose power, cut off the pilot control oil, and the rail brake 23 is in locked state, and the rail wheel floating hydraulic control valve is in the first working position, and the communication state of the two working oil ports of the left and right hydraulic motors 21 is cut off;

[0093] The method steps for controlling the rail wheel lifting cylinder 3 to act to lower the rail wheel driving device are as follows:

[0094] Control the rail wheel driving device to lose power, and be in the first working position, and at the same time, the cylinder control valve 8 is powered on, and is in the second working position, and the high pressure oil of the central rotary joint oil supply port supplies oil to the rail wheel lifting cylinder 3 through the corresponding oil ports of the rail wheel driving device to make the rail wheel lower to the specified position;

[0095] S22, when the control handle drives the rail wheel driving device to drive, the pilot signal of the handle makes the rail wheel unlocking valve 7 powered on, the pilot control oil opens the corresponding rail brake 23 through the shuttle valve 9, and the brake of the rail wheel driving device is released; the handle pilot signal controls the rail wheel driving device to drive the rail wheel driving device to drive;

[0096] The method steps for controlling the rail wheel driving device to drive the rail wheel driving device to drive are as follows:

[0097] When the rail wheel driving device is powered on, it is in the second working position, and the cylinder control valve 8 loses power and is in the first working position; the central rotary joint oil supply port supplies oil to the rail wheel hydraulic control unit 2, and the hydraulic oil in the track hydraulic control unit 1 returns to the oil tank through the oil drain oil way;

[0098] S23, when parking is needed, the handle is fully closed, the pilot pressure is zeroed after a delay preset time, and the rail wheel unlocking valve 7 is controlled to lose power after the hydraulic motor 21 is preliminarily braked, the rail wheel brake 23 brakes the hydraulic motor 21, and the rail wheel driving device returns to the parking brake state;

[0099] The control method provided by the application can realize smooth switching of the track drive and the rail wheel drive of the track drive walking of the screen cleaning integrated machine, and can make the rail wheel drive device float when the track drive walks;

[0100] The rail wheel can be braked by the rail wheel brake 23 when the rail wheel drive walks and the rail wheel is static, the rail wheel brake 23 can be started and opened in time when the rail wheel walks, and the brake can be closed after a momentary delay when the rail wheel walks and stops, so that the hydraulic motor 21 is buffered and braked first, and then the rail wheel brake 23 is started to park.

[0101] The above is only the preferred embodiment of the application, and does not limit the patent range of the application, and any equivalent structural transformation, direct / indirect application in other related technical fields under the inventive concept of the application, and the contents of the specification and the drawings are included in the patent protection range of the application.

Claims

1. A hydraulic control system of a screen cleaning all-in-one machine chassis, characterized in that, It includes a track hydraulic control unit for controlling track movement, a rail wheel hydraulic control unit for controlling rail wheel movement, and a rail wheel lifting cylinder for performing rail wheel lifting, as well as a rail wheel floating hydraulic control valve, a rail wheel floating pilot valve, a rail wheel movement switching valve, a rail wheel unlocking valve, a cylinder control valve, and a shuttle valve; The rail wheel hydraulic control unit includes a hydraulic motor, a hydraulic motor control valve connected to two working oil ports of the hydraulic motor, and a wheel-rail brake for braking the hydraulic motor. The oil ports of the rail wheel travel switching valve and the oil cylinder control valve are connected in series to switch the oil supply of the central rotary joint to the rail wheel hydraulic control unit or the track hydraulic control unit. The working port of the floating pilot valve of the rail wheel is connected to the third port of the shuttle valve, and also to the pilot port of the floating hydraulic control valve of the rail wheel. The working port of the rail wheel unlocking valve is connected to the second port of the shuttle valve, and the first port of the shuttle valve is connected to the wheel-rail brake. When the rail wheel floating pilot valve is energized, the wheel-rail brake releases the brake on the hydraulic motor, the rail wheel floating hydraulic control valve is in the second working position, and the two oil ports of the hydraulic motor are connected through the rail wheel floating hydraulic control valve, so that the rail wheel drive device is in a floating state; The wheel unlocking valve is used to control the braking / contact braking of the hydraulic motor by the wheel-rail brake when the wheel is traveling.

2. The hydraulic control system for the chassis of the integrated screen cleaning machine according to claim 1, characterized in that, The floating hydraulic control valve for the rail wheel is a two-position six-way hydraulic control valve. Its first oil port is connected to the A oil port of the left hydraulic motor, its second oil port is connected to the A oil port of the right hydraulic motor, its fifth oil port is connected to the B oil port of the left hydraulic motor, and its sixth oil port is connected to the B oil port of the right hydraulic motor. When the rail wheel floating hydraulic control valve is in the first working position, its first oil port is connected to its third oil port, its second oil port is connected to its fourth oil port, and its fifth oil port, its sixth oil port and the other oil ports are not connected to each other. When the rail wheel floating hydraulic control valve is in the second working position, its first oil port is connected to its fifth oil port, its second oil port is connected to its sixth oil port, and its third oil port and fourth oil port are not connected to the other oil ports.

3. The hydraulic control system for the chassis of the integrated screen cleaning machine according to claim 1 or 2, characterized in that, Both the wheel travel switching valve and the cylinder control valve are two-position six-way solenoid valves. The first and second oil ports of the wheel travel switching valve are respectively connected to the corresponding oil supply ports of the central rotary joint. Its third oil port is connected to the first oil port of the cylinder control valve, its fourth oil port is connected to the second oil port of the cylinder control valve, its fifth oil port is connected to the first oil port of the wheel hydraulic control unit, and its sixth oil port is connected to the second oil port of the wheel hydraulic control unit. The third port of the cylinder control valve is connected to the first port of the track hydraulic control unit, the fourth port is connected to the second port of the track hydraulic control unit, the fifth port is connected to the rod chamber of the rail wheel lifting cylinder, and the sixth port is connected to the rodless chamber of the rail wheel lifting cylinder.

4. The hydraulic control system for the chassis of the integrated screen cleaning machine according to claim 1 or 2, characterized in that, When neither the wheel travel switching valve nor the cylinder control valve is energized, both valves are in the first working position, supplying oil to the track hydraulic control unit through the central rotary joint. The hydraulic oil in the wheel hydraulic control unit returns to the oil tank through the drain oil circuit. When both the rail wheel travel switching valve and the cylinder control valve are energized, both valves are in the second working position, supplying oil to the rail wheel hydraulic control unit through the central rotary joint, and the hydraulic oil in the track hydraulic control unit returns to the oil tank through the drain oil circuit. The wheel travel switching valve is de-energized and in the first working position; at the same time, the cylinder control valve is energized and in the second working position, supplying oil to the wheel lifting cylinder through the central rotary joint.

5. The hydraulic control system for the chassis of the integrated screen cleaning machine according to claim 4, characterized in that, When both the wheel travel switching valve and the cylinder control valve are in the first working position: The first oil port of the rail wheel travel switching valve is connected to the third oil port of the rail wheel travel switching valve, and the first oil port of the cylinder control valve is connected to the third oil port of the cylinder control valve. The second oil port of the rail wheel travel switching valve is connected to the fourth oil port of the rail wheel travel switching valve, and the second oil port of the cylinder control valve is connected to the fourth oil port of the cylinder control valve. The fifth oil port of the rail wheel travel switching valve, the sixth oil port of the rail wheel travel switching valve, the fifth oil port of the cylinder control valve, and the sixth oil port of the cylinder control valve are all not connected to the other unconnected oil ports. When both the wheel travel switching valve and the cylinder control valve are in the second working position: The first oil port of the rail wheel travel switching valve is connected to the fifth oil port of the rail wheel travel switching valve, and the first oil port of the cylinder control valve is connected to the fifth oil port of the cylinder control valve. The second oil port of the rail wheel travel switching valve is connected to the sixth oil port of the rail wheel travel switching valve, and the second oil port of the cylinder control valve is connected to the sixth oil port of the cylinder control valve. The third oil port of the rail wheel travel switching valve, the fourth oil port of the rail wheel travel switching valve, the third oil port of the cylinder control valve, and the fourth oil port of the cylinder control valve are all not connected to the other unconnected oil ports.

6. A control method for the hydraulic control system of the chassis of a screen cleaning and screening machine as described in any one of claims 1-5, characterized in that, The steps include: S1. When the track is driven: First, put the rail wheel drive device into automatic floating state. Then, when the rail wheel travel switching valve and the cylinder control valve are not energized, both valves are in the first working position. Oil is supplied to the track hydraulic control unit through the central rotary joint to make the track travel. S2, when traveling by rail wheel drive: S21. First, release the floating state of the rail wheel drive device and brake the hydraulic motor with the wheel-rail brake; then control the rail wheel lifting cylinder to lower the rail wheel drive device so that the rail wheel drive device is in the parking brake state. S22. When the control handle drives the rail wheel drive device to move, the pilot signal of the handle energizes the rail wheel unlocking valve, and the pilot control oil opens the corresponding wheel-rail brake through the shuttle valve, releasing the brake on the rail wheel drive device; the pilot signal of the handle controls the rail wheel travel switching valve to supply oil to the rail wheel hydraulic control unit to make the rail wheel drive device move. S23. When parking is required, the control handle is completely closed, the pilot pressure is zero and then delayed for a preset time. After the hydraulic motor has initially braked, the rail wheel unlocking valve is de-energized, the wheel-rail brake brakes the hydraulic motor, and the rail wheel drive device returns to the parking brake state.

7. The control method according to claim 6, characterized in that, In step S1, the method for putting the rail wheel drive device into an automatic floating state is as follows: When the wheel floating pilot valve is energized, the pilot control oil opens the corresponding wheel-rail brake through the shuttle valve. At the same time, the pilot control oil pushes the wheel floating hydraulic control valve to the second working position. The two working oil ports of the hydraulic motors on the left and right sides used to drive the wheel are connected through the wheel floating hydraulic control valve, so that the wheel drive device is in an automatic floating state.

8. The control method according to claim 6 or 7, characterized in that, In step S21, the method for releasing the floating state of the rail wheel drive device is as follows: First, de-energize the wheel floating pilot valve to cut off the pilot control oil. The wheel-rail brake is in the locked state, the wheel floating hydraulic control valve is in the first working position, and the connection between the two working oil ports of the left and right hydraulic motors is cut off.

9. The control method according to claim 6 or 7, characterized in that, In step S21, the method for controlling the movement of the rail wheel lifting cylinder to lower the rail wheel drive device is as follows: When the control wheel travel switching valve is de-energized and in the first working position, the hydraulic cylinder control valve is energized and in the second working position. The high-pressure oil from the central rotary interface oil port supplies oil to the wheel lifting cylinder through the corresponding oil ports of the wheel travel switching valve and the hydraulic cylinder control valve, causing the wheel to descend to the designated position.

10. The control method according to claim 6 or 7, characterized in that, In step S22, the method for controlling the wheel travel switching valve to supply oil to the wheel hydraulic control unit is as follows: When the control wheel travel switching valve is energized, it is in the second working position; when the cylinder control valve is de-energized, it is in the first working position; the central rotary joint oil supply port supplies oil to the wheel hydraulic control unit, and the hydraulic oil in the track hydraulic control unit returns to the oil tank through the drain oil circuit.

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