Road sweeper, sweeper brush assembly, sweeper brush floating hydraulic system and its control method

Abstract

The present invention discloses a road sweeper, a sweeper brush assembly, a sweeper brush floating hydraulic system and a control method thereof. The sweeper brush floating hydraulic system includes a sweeper brush support oil cylinder, a pressure reducing valve, an oil pump and an oil tank. One of the rod chamber and the rodless chamber of the sweeper brush support oil cylinder is communicated with the oil pump through the pressure reducing valve, and the other of the rod chamber and the rodless chamber of the sweeper brush support oil cylinder is communicated with the oil tank. The pressure reducing valve is used to adjust the oil pressure output to the rod chamber or the rodless chamber of the sweeper brush support oil cylinder; the above hydraulic system enables the sweeper brush to automatically adjust the operation height according to the unevenness of the road surface and the wear of the sweeper brush, without manual adjustment, reducing the workload of the user, not aggravating the wear of the sweeper brush due to the unevenness of the road surface, improving the cleaning effect on the uneven road surface while extending the service life of the sweeper brush, and by adjusting the outlet pressure of the pressure reducing valve, the mutual force between the ground and the sweeper brush can be adjusted, so as to realize the adjustment of the cleaning effect.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitation equipment, and particularly to a road sweeper, a sweeper brush assembly, a sweeper brush floating hydraulic system and a control method thereof. Background Art

[0002] With the introduction of policies such as the Blue Sky Defense War and Beautiful Countryside, the environmental protection requirements in cities, towns and villages have been continuously improved. More and more roads need to be cleaned and maintained, and the workload has been increasing continuously. However, manual cleaning operations have high costs and low efficiency. Therefore, mechanized cleaning operation methods represented by road sweepers and washing road sweepers have been rapidly promoted.

[0003] As the forefront of a road sweeper, the sweeper brush is responsible for sweeping road surface garbage to the suction cup, and then the suction cup sucks the garbage into the dustbin. The cleaning effect of the sweeper brush directly affects the use performance of the whole road sweeper. At the same time, the bristles of the sweeper brush are vulnerable parts, and the service life of the bristles has a significant impact on the use cost of the whole road sweeper. And the working height of the sweeper disk directly determines the contact degree between the sweeper brush and the ground, the cleaning effect of the sweeper brush and the service life of the bristles.

[0004] The sweeper disk structure of the existing road sweeper is as Figure 1 shown. The sweeper disk structure includes a sweeper disk 01, a connecting rod 02, an oil cylinder 03 and a limit adjusting sleeve 04. One end of the connecting rod 02 and one end of the oil cylinder 03 are respectively rotatably connected to the body of the road sweeper. The other end of the connecting rod 02 is connected to the sweeper disk 01, and the other end of the oil cylinder 03 is rotatably connected to the connecting rod 02. The limit adjusting sleeve 04 is in threaded cooperation with the piston rod of the oil cylinder 03. It can be seen from the attached drawings that when the piston rod of the oil cylinder 03 extends, the connecting rod 02 drives the sweeper disk 01 to move upward. When the piston rod of the oil cylinder 03 retracts, the connecting rod 02 drives the sweeper disk 01 to move downward. By adjusting the position of the limit adjusting sleeve 04 on the piston rod of the oil cylinder 03, the retraction amount of the piston rod of the oil cylinder 03 can be controlled, so as to realize different working heights of the sweeper disk. This way of adjusting the working height of the sweeper disk is manual adjustment and needs to be preset before the road sweeper runs. Since the working height of the sweeper disk is mechanically limited in advance, during the operation of the road sweeper, the working height of the sweeper disk cannot be automatically adjusted according to the unevenness of the road surface, the bristles wear faster, and the cleaning effect on the uneven road surface is poor. On the other hand, after the sweeper brush has been worn for a period of time, in order to ensure the cleaning effect, the working height of the sweeper disk needs to be manually calibrated again by the staff, increasing the workload of users. Summary of the Invention

[0005] In view of this, the first object of the present invention is to provide a sweeper brush floating hydraulic system, so that the working height of the sweeper brush can change automatically with the unevenness of the road surface and its own wear condition, reduce unnecessary wear caused by the uneven road surface, improve the cleaning effect on the uneven road surface, and avoid the subsequent manual calibration increasing the workload of users.

[0006] The second object of the present invention is to provide a method for controlling the working height of a sweeping brush, a sweeping brush assembly, and a road sweeper based on the above-mentioned sweeping brush floating hydraulic system.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A sweeping brush floating hydraulic system includes a sweeping brush support cylinder, a pressure reducing valve, an oil pump, and an oil tank. One of the rod chamber and the rodless chamber of the sweeping brush support cylinder is communicated with the oil pump through the pressure reducing valve, and the other of the rod chamber and the rodless chamber of the sweeping brush support cylinder is communicated with the oil tank.

[0009] Preferably, it further includes a two-position four-way solenoid valve, a one-way valve, and a hydraulic control one-way valve. The oil inlet of the two-position four-way solenoid valve is communicated with the oil pump, the oil return port of the two-position four-way solenoid valve is communicated with the oil tank, one working oil port of the two-position four-way solenoid valve is communicated with the oil inlet of the pressure reducing valve, the oil outlet of the pressure reducing valve is communicated with one of the rod chamber and the rodless chamber of the sweeping brush support cylinder through the one-way valve, and the one-way valve is used for unidirectionally conducting the oil outlet of the pressure reducing valve to one of the rod chamber and the rodless chamber of the sweeping brush support cylinder. The other working oil port of the two-position four-way solenoid valve is communicated with the other of the rod chamber and the rodless chamber of the sweeping brush support cylinder and the hydraulic control port of the hydraulic control one-way valve, and one of the rod chamber and the rodless chamber of the sweeping brush support cylinder is communicated with the oil tank through the hydraulic control one-way valve.

[0010] Preferably, it further includes a two-position four-way solenoid valve, a three-position four-way solenoid valve, a one-way valve, and a hydraulic control one-way valve. The oil inlet of the three-position four-way solenoid valve is communicated with the oil pump, the oil return port of the three-position four-way solenoid valve and the oil return port of the two-position four-way solenoid valve are respectively communicated with the oil tank. One working oil port of the three-position four-way solenoid valve is communicated with one of the rod chamber and the rodless chamber of the sweeping brush support cylinder through the hydraulic control one-way valve, the other working oil port of the three-position four-way solenoid valve is communicated with the oil inlet of the two-position four-way solenoid valve, one working oil port of the two-position four-way solenoid valve is communicated with the oil inlet of the pressure reducing valve, the oil outlet of the pressure reducing valve is communicated with one of the rod chamber and the rodless chamber of the sweeping brush support cylinder through the one-way valve, and the one-way valve is used for unidirectionally conducting the oil outlet of the pressure reducing valve to one of the rod chamber and the rodless chamber of the sweeping brush support cylinder. The other working oil port of the two-position four-way solenoid valve is communicated with the hydraulic control port of the hydraulic control one-way valve and the other of the rod chamber and the rodless chamber of the sweeping brush support cylinder.

[0011] A method for controlling the working height of a sweeping brush based on the above-mentioned sweeping brush floating hydraulic system includes the steps:

[0012] Obtain user instructions;

[0013] If the instruction is a road sweeping operation instruction, control the right solenoid of the three-position four-way solenoid valve DT3 to be energized. One of the rodless cavity and the rod cavity of the sweeper support cylinder is connected to the output end of the oil pump through a check valve, a pressure reducing valve, a two-position four-way solenoid valve and a three-position four-way solenoid valve. The other of the rodless cavity and the rod cavity of the sweeper support cylinder is connected to the fuel tank through a two-position four-way solenoid valve. The sweeper support cylinder acts to move the sweeper to a preset operation position;

[0014] If the instruction is an end-of-operation instruction, control the left solenoid of the three-position four-way solenoid valve DT2 to be energized. One of the rodless cavity and the rod cavity of the sweeper support cylinder is connected to the output end of the oil pump through a hydraulic control check valve and a three-position four-way solenoid valve. The other of the rodless cavity and the rod cavity of the sweeper support cylinder is connected to the fuel tank through a two-position four-way solenoid valve. The sweeper support cylinder acts to lift the sweeper to the highest position;

[0015] If the instruction is a maintenance instruction, control the right solenoid of the three-position four-way solenoid valve DT3 and the solenoid of the two-position four-way solenoid valve DT1 to be energized. One of the rodless cavity and the rod cavity of the sweeper support cylinder is connected to the fuel tank through a hydraulic control check valve and a three-position four-way solenoid valve. The other of the rodless cavity and the rod cavity of the sweeper support cylinder is connected to the output end of the oil pump through a two-position four-way solenoid valve and a three-position four-way solenoid valve. The hydraulic control check valve is reversely conducted under the action of pressure oil, and the sweeper support cylinder acts to drive the sweeper to lower.

[0016] Preferably, it further includes a calibration step:

[0017] Obtain road condition information;

[0018] Control the right solenoid of the three-position four-way solenoid valve DT3 to be energized. One of the rodless cavity and the rod cavity of the sweeper support cylinder is connected to the output end of the oil pump through a check valve, a pressure reducing valve, a two-position four-way solenoid valve and a three-position four-way solenoid valve. The other of the rodless cavity and the rod cavity of the sweeper support cylinder is connected to the fuel tank through a two-position four-way solenoid valve;

[0019] Adjust the outlet pressure of the pressure reducing valve in multiple times, and after each adjustment, control the sweeper to perform a road sweeping operation on the road condition at that place. Select the position of the sweeper with the best sweeping effect as the operation position corresponding to the obtained road condition information, and use this operation position as the preset operation position corresponding to this road condition information.

[0020] A sweeper assembly, comprising:

[0021] A connecting rod, the first end of the connecting rod is rotatably arranged on the body of the road sweeper relative to the body of the road sweeper;

[0022] A sweeper arranged at the second end of the connecting rod;

[0023] For the sweeping brush floating hydraulic system described in any one of the above, one of the cylinder block and the piston rod of the sweeping brush support oil cylinder of the sweeping brush floating hydraulic system is rotatably arranged relative to the body of the road sweeper on the body of the road sweeper, and the other of the cylinder block and the piston rod of the sweeping brush support oil cylinder is rotatably connected to the connecting rod. The connecting rod swings up and down with the telescopic movement of the sweeping brush support oil cylinder to drive the sweeping brush to lift and lower.

[0024] Preferably, an adjusting rod is further included. The length of the adjusting rod is adjustable, and the first end of the adjusting rod is rotatably arranged relative to the body of the road sweeper on the body of the road sweeper. The second end of the adjusting rod and the second end of the connecting rod are respectively rotatably connected to the sweeping brush, and the sweeping brush rotates relative to the connecting rod with the telescopic movement of the adjusting rod.

[0025] Preferably, an installation member for arranging the sweeping brush assembly on the body of the road sweeper is further included. One of the cylinder block and the piston rod of the sweeping brush support oil cylinder, the first end of the adjusting rod, and the first end of the connecting rod are respectively rotatably connected to the installation member.

[0026] Preferably, the installation member includes a fixed frame, a rotating frame, and a driving device. The rotating frame is rotatably arranged on the fixed frame. The fixed frame is used for arranging on the body of the road sweeper. One of the cylinder block and the piston rod of the sweeping brush support oil cylinder, the first end of the adjusting rod, and the first end of the connecting rod are respectively rotatably connected to the rotating frame. The rotation axis of the rotating frame relative to the fixed frame is perpendicular to the rotation axis of the connecting rod relative to the rotating frame. The driving device is arranged on the fixed frame or the body of the road sweeper, and the output end of the driving device is connected to the rotating frame to drive the rotating frame to rotate relative to the fixed frame.

[0027] A road sweeper includes the sweeping brush assembly described in any one of the above.

[0028] To achieve the above object, the present invention provides a sweeping brush floating hydraulic system, which includes a sweeping brush support oil cylinder, a pressure reducing valve, an oil pump and an oil tank. Among them, one of the rod chamber and the rodless chamber of the sweeping brush support oil cylinder is communicated with the oil pump through the pressure reducing valve, and the other of the rod chamber and the rodless chamber of the sweeping brush support oil cylinder is communicated with the oil tank. The pressure reducing valve is used to adjust the oil pressure output to the rod chamber or the rodless chamber of the sweeping brush support oil cylinder. If the rod chamber of the sweeping brush support oil cylinder is communicated with the oil pump through the pressure reducing valve, the sweeping brush moves up with the retraction of the piston rod of the sweeping brush support oil cylinder and moves down with the extension of the piston rod of the sweeping brush support oil cylinder. If the rodless chamber of the sweeping brush support oil cylinder is communicated with the oil pump through the pressure reducing valve, the sweeping brush moves up with the extension of the piston rod of the sweeping brush support oil cylinder and moves down with the retraction of the piston rod of the sweeping brush support oil cylinder. When applied, by utilizing the characteristic that the outlet pressure of the pressure reducing valve is basically constant, through the adjustment of the outlet pressure of the pressure reducing valve, the sum of the supporting force exerted by the sweeping brush support oil cylinder on the sweeping brush and the supporting force of the ground on the sweeping brush can be balanced with the self-weight of the sweeping brush. When the ground has uneven changes or the sweeping brush wears, the supporting force of the ground on the sweeping brush also changes accordingly, while the self-weight of the sweeping brush and the supporting force exerted by the sweeping brush support oil cylinder on the sweeping brush remain unchanged, and the above balance is broken, thereby realizing that the sweeping brush automatically adjusts the working height according to the uneven changes of the road surface and the wear of the sweeping brush, without manual adjustment, reducing the workload of users, and not aggravating the wear of the sweeping brush due to the uneven changes of the road surface, improving the cleaning effect on uneven road surfaces while extending the service life of the sweeping brush, and by adjusting the outlet pressure of the pressure reducing valve, the mutual force between the ground and the sweeping brush can be adjusted, thereby realizing the adjustment of the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a structural schematic diagram of a sweeping brush assembly in the prior art;

[0031] Figure 2 It is a structural schematic diagram of a sweeping brush floating hydraulic system provided by an embodiment of the present invention;

[0032] Figure 3 It is a structural schematic diagram of a sweeping brush floating hydraulic system provided by another embodiment of the present invention;

[0033] Figure 4 It is a structural schematic diagram of a sweeping brush assembly provided by an embodiment of the present invention.

[0034] Figure 1 In the figure:

[0035] 01 is the sweeping brush; 02 is the connecting rod; 03 is the oil cylinder; 04 is the limit adjusting sleeve.

[0036] Figures 2 - 4 In the figure:

[0037] 1 is the sweeping brush support oil cylinder; 2 is the one-way valve; 3 is the pressure reducing valve; 4 is the hydraulic control one-way valve; 5 is the two-position four-way solenoid valve; 6 is the three-position four-way solenoid valve; 7 is the sweeping brush; 8 is the connecting rod; 9 is the mounting member; 10 is the adjusting rod. Specific embodiments

[0038] One of the cores of the present invention is to provide a sweeping brush floating hydraulic system. The structural design of the sweeping brush floating hydraulic system enables the working height of the sweeping brush to automatically change with the unevenness of the road surface and its own wear condition, reducing unnecessary wear caused by the uneven road surface, improving the cleaning effect on uneven road surfaces, and avoiding the subsequent manual calibration that increases the workload of users.

[0039] Another core of the present invention is to provide a method for controlling the working height of a sweeping brush, a sweeping brush assembly, and a road sweeper based on the above-mentioned sweeping brush floating hydraulic system.

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] A sweeping brush floating hydraulic system provided by an embodiment of the present invention includes a sweeping brush support oil cylinder 1, a pressure reducing valve 3, an oil pump, and an oil tank.

[0042] Among them, one of the rod chamber and the rodless chamber of the sweeping brush support oil cylinder 1 is connected to the oil pump through the pressure reducing valve 3, and the other of the rod chamber and the rodless chamber of the sweeping brush support oil cylinder 1 is connected to the oil tank. The pressure reducing valve 3 is used to adjust the oil pressure output to the rod chamber or the rodless chamber of the sweeping brush support oil cylinder 1. If the rod chamber of the sweeping brush support oil cylinder 1 is connected to the oil pump through the pressure reducing valve 3, the sweeping brush 7 moves upward as the piston rod of the sweeping brush support oil cylinder 1 retracts and moves downward as the piston rod of the sweeping brush support oil cylinder 1 extends. If the rodless chamber of the sweeping brush support oil cylinder 1 is connected to the oil pump through the pressure reducing valve 3, the sweeping brush 7 moves upward as the piston rod of the sweeping brush support oil cylinder 1 extends and moves downward as the piston rod of the sweeping brush support oil cylinder 1 retracts.

[0043] Compared with the prior art, when the sweeping brush floating hydraulic system provided by the present invention is applied, by utilizing the characteristic that the outlet pressure of the pressure reducing valve 3 is basically constant, through the adjustment of the outlet pressure of the pressure reducing valve 3, the sum of the supporting force exerted by the sweeping brush supporting oil cylinder 1 on the sweeping brush 7 and the supporting force of the ground on the sweeping brush 7 can be balanced with the self-weight of the sweeping brush 7. When the ground is sunken or the sweeping brush 7 is worn, the supporting force of the ground on the sweeping brush 7 decreases, while the self-weight of the sweeping brush 7 and the supporting force exerted by the sweeping brush supporting oil cylinder 1 on the sweeping brush 7 remain unchanged, and the original balance is broken. Therefore, the sweeping brush 7 will lower itself until the supporting force of the ground on the sweeping brush 7 returns to the original level and a new balance is formed again; when the ground is convex, the supporting force of the ground on the sweeping brush 7 increases, the self-weight of the sweeping brush 7 and the supporting force exerted by the sweeping brush supporting oil cylinder 1 on the sweeping brush 7 remain unchanged, and the sweeping brush 7 moves upward to break the original balance under the action of the ground supporting force until the supporting force of the ground on the sweeping brush 7 decreases to a level where a new balance is formed among the self-weight of the sweeping brush 7, the supporting force exerted by the sweeping brush supporting oil cylinder 1 on the sweeping brush 7, and the supporting force of the ground on the sweeping brush 7; thus, it can be seen that when the ground has uneven changes or the sweeping brush 7 is worn, the supporting force of the ground on the sweeping brush 7 also changes accordingly, while the self-weight of the sweeping brush 7 and the supporting force exerted by the sweeping brush supporting oil cylinder 1 on the sweeping brush 7 remain unchanged, and the sweeping brush 7 moves in a direction to form a new balance among the self-weight of the sweeping brush 7, the supporting force exerted by the sweeping brush supporting oil cylinder 1 on the sweeping brush 7, and the supporting force of the ground on the sweeping brush 7, thereby realizing the automatic adjustment of the working height of the sweeping brush 7 with the uneven changes of the road surface and the wear of the sweeping brush 7. There is no need for manual adjustment, reducing the workload of users, and the wear of the sweeping brush 7 will not be aggravated due to the uneven changes of the road surface. While improving the cleaning effect on uneven road surfaces, the service life of the sweeping brush 7 is extended, and by adjusting the outlet pressure of the pressure reducing valve 3, the mutual force between the ground and the sweeping brush 7 can be adjusted, thereby realizing the adjustment of the cleaning effect.

[0044] In actual application, after the sweeping operation is completed, the sweeping brush 7 may need to be lowered and / or raised. For this reason, in a specific embodiment of the present invention, as Figure 2 shown, the above hydraulic system further includes a two-position four-way solenoid valve 5, a check valve 2, and a pilot-operated check valve 4. The oil inlet of the two-position four-way solenoid valve 5 is connected to the oil pump, the oil return port of the two-position four-way solenoid valve 5 is connected to the oil tank, one working oil port of the two-position four-way solenoid valve 5 is connected to the oil inlet of the pressure reducing valve 3, the oil outlet of the pressure reducing valve 3 is connected to one of the rodless cavity and the rod cavity of the sweeping brush supporting oil cylinder 1 through the check valve 2, and the check valve 2 is used to unidirectionally conduct the oil from the oil outlet of the pressure reducing valve 3 to one of the rodless cavity and the rod cavity of the sweeping brush supporting oil cylinder 1. The other working oil port of the two-position four-way solenoid valve 5 is connected to the other of the rodless cavity and the rod cavity of the sweeping brush supporting oil cylinder 1 and the pilot control port of the pilot-operated check valve 4, and one of the rodless cavity and the rod cavity of the sweeping brush supporting oil cylinder 1 is connected to the oil tank through the pilot-operated check valve 4.

[0045] During the road sweeping operation, the electromagnet DT1 of the two-position four-way solenoid valve 5 is not energized. The oil outlet of the oil pump is connected to the rodless cavity of the brush support cylinder 1 through the pressure oil port P, the working oil port A, the pressure reducing valve 3 and the check valve 2 of the two-position four-way solenoid valve 5. The rod cavity of the brush support cylinder 1 is connected to the fuel tank through the working oil port B and the oil return port T of the two-position four-way solenoid valve 5; after the road sweeping operation is completed, if it is necessary to lower or raise the brush 7, then control the electromagnet DT1 of the two-position four-way solenoid valve 5 to be energized, and the two-position four-way solenoid valve 5 switches from the left position to the right position. The oil outlet of the oil pump is connected to the rod cavity of the brush support cylinder 1 through the pressure oil port P and the working oil port B of the two-position four-way solenoid valve 5. At the same time, under the action of the oil pressure output by the oil pump, the pilot-operated check valve 4 is opened to conduct the right path between the rodless cavity of the brush support cylinder 1 and the fuel tank, so that the rodless cavity of the brush support cylinder 1 is connected to the fuel tank. At this time, the piston rod of the brush support cylinder 1 retracts, and the brush 7 is lowered to the lowest point or raised to the highest point.

[0046] Of course, the above floating hydraulic system can also adopt other structures, such as Figure 3 As shown, in another embodiment of the present invention, the above floating hydraulic system further includes a two-position four-way solenoid valve 5, a three-position four-way solenoid valve 6, a check valve 2 and a pilot-operated check valve 4. The oil inlet of the three-position four-way solenoid valve 6 is connected to the oil pump. The oil return port of the three-position four-way solenoid valve 6 and the oil return port of the two-position four-way solenoid valve 5 are respectively connected to the fuel tank. One working oil port of the three-position four-way solenoid valve 6 is connected to one of the rodless cavity and the rod cavity of the brush support cylinder 1 (shown as the rodless cavity) through the pilot-operated check valve 4. The other working oil port of the three-position four-way solenoid valve 6 is connected to the oil inlet of the two-position four-way solenoid valve 5. One working oil port of the two-position four-way solenoid valve 5 is connected to the oil inlet of the pressure reducing valve 3. The oil outlet of the pressure reducing valve 3 is connected to one of the rodless cavity and the rod cavity of the brush support cylinder 1 (shown as the rodless cavity) through the check valve 2. The check valve 2 is used to conduct the oil from the oil outlet of the pressure reducing valve 3 to one of the rodless cavity and the rod cavity of the brush support cylinder 1 (shown as the rodless cavity) unidirectionally. The other working oil port of the two-position four-way solenoid valve 5 is connected to the pilot control port of the pilot-operated check valve 4 and the other working oil port of the two-position four-way solenoid valve 5 is connected to the other of the rodless cavity and the rod cavity of the brush support cylinder 1 (shown as the rod cavity).

[0047] Based on the above brush floating hydraulic system, an embodiment of the present invention further provides a method for controlling the working height of the brush. The control method includes the steps of:

[0048] S01: Obtain a user instruction;

[0049] S02: If the instruction is a road sweeping operation instruction, control the right solenoid DT3 of the three-position four-way solenoid valve 6 to be energized. One of the rodless cavity and the rod cavity of the brush support cylinder 1 is connected to the oil pump output through the one-way valve 2, the pressure reducing valve 3, the two-position four-way solenoid valve 5 and the three-position four-way solenoid valve 6. The other of the rodless cavity and the rod cavity of the brush support cylinder 1 is connected to the fuel tank through the two-position four-way solenoid valve 5. The brush support cylinder 1 acts to move the brush 7 to a preset operation position. The preset operation position is the position where the outlet pressure of the pressure reducing valve 3 is adjusted according to the road condition so that the interaction force between the brush 7 and the ground meets the road condition requirements;

[0050] If the instruction is an end operation instruction, control the left solenoid DT2 of the three-position four-way solenoid valve 6 to be energized. One of the rodless cavity and the rod cavity of the brush support cylinder 1 is connected to the oil pump output through the hydraulic control check valve 4 and the three-position four-way solenoid valve 6. The other of the rodless cavity and the rod cavity of the brush support cylinder 1 is connected to the fuel tank through the two-position four-way solenoid valve 5. The brush support cylinder 1 acts to lift the brush 7 to the highest position;

[0051] If the instruction is a maintenance instruction, control the right solenoid DT3 of the three-position four-way solenoid valve 6 and the solenoid DT1 of the two-position four-way solenoid valve 5 to be energized. One of the rodless cavity and the rod cavity of the brush support cylinder 1 is connected to the fuel tank through the hydraulic control check valve 4 and the three-position four-way solenoid valve 6. The other of the rodless cavity and the rod cavity of the brush support cylinder 1 is connected to the oil pump output through the two-position four-way solenoid valve 5 and the three-position four-way solenoid valve 6. The hydraulic control check valve 4 is reversely conducted under the action of the pressure oil, and the brush support cylinder 1 acts to drive the brush 7 to lower, so as to facilitate the user for maintenance.

[0052] Further, before the above steps, the control method further includes a calibration step:

[0053] S11: Obtain road condition information;

[0054] Obtain the road condition information and input it into the system. The road condition information includes asphalt road surface, cement road surface, and masonry road surface, so as to form a comparison table of road condition information and the outlet pressure of the pressure reducing valve 3 in the system after calibration. When the user performs subsequent operations, the system can retrieve the corresponding outlet pressure of the pressure reducing valve 3 from the above comparison table according to the road condition information input by the user and adjust the pressure reducing valve 3;

[0055] S12: Control the right solenoid DT3 of the three-position four-way solenoid valve 6 to be energized. One of the rodless cavity and the rod cavity of the brush support cylinder 1 is connected to the oil pump output through the one-way valve 2, the pressure reducing valve 3, the two-position four-way solenoid valve 5 and the three-position four-way solenoid valve 6. The other of the rodless cavity and the rod cavity of the brush support cylinder 1 is connected to the fuel tank through the two-position four-way solenoid valve 5;

[0056] S13: Adjust the outlet pressure of the pressure reducing valve 3 in multiple steps. After each adjustment, control the sweeper brush 7 to clean the road conditions at that location. Select the location of the sweeper brush 7 with the best cleaning effect among them as the operation location that conforms to the obtained road condition information, and use this operation location as the preset operation location corresponding to this road condition information.

[0057] Please refer to Figure 4 , the embodiment of the present invention also provides a sweeper brush assembly, which includes a connecting rod 8, a sweeper brush 7, and the sweeper brush floating hydraulic system as described in the above embodiment. Among them, the first end of the connecting rod 8 is rotatably arranged on the body of the road sweeper relative to the body of the road sweeper; the sweeper brush 7 is arranged at the second end of the connecting rod 8; one of the cylinder body and the piston rod of the sweeper support cylinder 1 of the sweeper brush floating hydraulic system is rotatably arranged on the body of the road sweeper relative to the body of the road sweeper, and the other of the cylinder body and the piston rod of the sweeper support cylinder 1 is rotatably connected to the connecting rod 8. The connecting rod 8 swings up and down with the expansion and contraction of the sweeper support cylinder 1 to drive the sweeper brush 7 to lift and lower.

[0058] The above-mentioned sweeper support cylinder 1 can be arranged on the upper side or the lower side of the connecting rod 8. When the sweeper support cylinder 1 is arranged on the upper side of the connecting rod 8, when the piston rod of the sweeper support cylinder 1 extends, the connecting rod 8 drives the sweeper brush 7 to lower. When the piston rod of the sweeper support cylinder 1 retracts, the connecting rod 8 drives the sweeper brush 7 to move up; when the sweeper support cylinder 1 is arranged on the lower side of the connecting rod 8, as Figure 4 shown, when the piston rod of the sweeper support cylinder 1 extends, the connecting rod 8 drives the sweeper brush 7 to move up. When the piston rod of the sweeper support cylinder 1 retracts, the connecting rod 8 drives the sweeper brush 7 to lower.

[0059] Further optimize the above technical solution, as Figure 4 shown, the above-mentioned sweeper brush assembly further includes an adjusting rod 10. The length of the adjusting rod 10 is adjustable, and the first end of the adjusting rod 10 is rotatably arranged on the body of the road sweeper relative to the body of the road sweeper. The second end of the adjusting rod 10 and the second end of the connecting rod 8 are respectively rotatably connected to the sweeper brush 7. The sweeper brush 7 rotates relative to the connecting rod 8 with the expansion and contraction of the adjusting rod 10. In this way, when the adjusting rod 10 expands and contracts, the sweeper disc rotates relative to the connecting rod 8, and the contact area and contact position between the sweeper brush 7 and the ground can be changed.

[0060] Preferably, as Figure 4 , the sweeper brush assembly further includes a mounting member 9 for mounting the sweeper brush assembly on the body of the road sweeper. One of the cylinder body and the piston rod of the sweeper support cylinder 1, the first end of the adjusting rod 10, and the first end of the connecting rod 8 are respectively rotatably connected to the mounting member 9.

[0061] Further, the above-mentioned mounting member 9 includes a fixed frame, a rotating frame, and a driving device. The rotating frame is rotatably arranged on the fixed frame. The fixed frame is used to be arranged on the body of the road sweeper. One of the cylinder body and the piston rod of the road sweeping brush support oil cylinder 1, the first end of the adjusting rod 10, and the first end of the connecting rod 8 are respectively rotatably connected to the rotating frame. The rotation axis of the rotating frame relative to the fixed frame is perpendicular to the rotation axis of the connecting rod 8 relative to the rotating frame. The driving device is arranged on the fixed frame or the body of the road sweeper. The output end of the driving device is connected to the rotating frame to drive the rotating frame to rotate relative to the fixed frame, so that the road sweeping brush 7 can swing in the front-back direction of the body.

[0062] An embodiment of the present invention further provides a road sweeper, which includes the road sweeping brush assembly described in the above embodiment. Since the road sweeper adopts the road sweeping brush assembly in the above embodiment, for the technical effects of the road sweeper, please refer to the above embodiment.

[0063] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0064] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A brush sweeping floating hydraulic system, characterized in that it includes a brush sweeping support oil cylinder, a pressure reducing valve, an oil pump and an oil tank. One of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder is communicated with the oil pump through the pressure reducing valve, and the other of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder is communicated with the oil tank; It further includes a two-position four-way solenoid valve, a check valve and a pilot-operated check valve. The oil inlet of the two-position four-way solenoid valve is communicated with the oil pump, the oil return port of the two-position four-way solenoid valve is communicated with the oil tank, one working oil port of the two-position four-way solenoid valve is communicated with the oil inlet of the pressure reducing valve, the oil outlet of the pressure reducing valve is communicated with one of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder through the check valve, and the check valve is used for unidirectionally conducting from the oil outlet of the pressure reducing valve to one of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder. The other working oil port of the two-position four-way solenoid valve is communicated with the other of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder and the pilot port of the pilot-operated check valve, and one of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder is communicated with the oil tank through the pilot-operated check valve; It further includes a two-position four-way solenoid valve, a three-position four-way solenoid valve, a check valve and a pilot-operated check valve. The oil inlet of the three-position four-way solenoid valve is communicated with the oil pump, the oil return port of the three-position four-way solenoid valve and the oil return port of the two-position four-way solenoid valve are respectively communicated with the oil tank. One working oil port of the three-position four-way solenoid valve is communicated with one of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder through the pilot-operated check valve, the other working oil port of the three-position four-way solenoid valve is communicated with the oil inlet of the two-position four-way solenoid valve, one working oil port of the two-position four-way solenoid valve is communicated with the oil inlet of the pressure reducing valve, the oil outlet of the pressure reducing valve is communicated with one of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder through the check valve, and the check valve is used for unidirectionally conducting from the oil outlet of the pressure reducing valve to one of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder. The other working oil port of the two-position four-way solenoid valve is communicated with the pilot port of the pilot-operated check valve and the other working oil port of the two-position four-way solenoid valve is communicated with the other of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder.

2. A method for controlling the working height of a brush sweeping operation based on the brush sweeping floating hydraulic system according to claim 1, characterized in that, it includes the steps of: obtaining a user instruction; If the instruction is a road sweeping operation instruction, then control the right-position electromagnet DT3 of the three-position four-way solenoid valve to be energized. One of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder is communicated with the output end of the oil pump through the check valve, the pressure reducing valve, the two-position four-way solenoid valve and the three-position four-way solenoid valve, and the other of the rod chamber and the rodless chamber of the brush sweeping support oil cylinder is communicated with the oil tank through the two-position four-way solenoid valve, and the brush sweeping support oil cylinder acts to move the brush to a preset working position; If the instruction is an end-operation instruction, control the left-position electromagnet DT2 of the three-position four-way solenoid valve to be energized. One of the rodless cavity and the rod cavity of the brush support oil cylinder is connected to the output end of the oil pump through a hydraulic control check valve and the three-position four-way solenoid valve, and the other of the rodless cavity and the rod cavity of the brush support oil cylinder is connected to the fuel tank through a two-position four-way solenoid valve. The brush support oil cylinder acts to lift the brush to the highest position. If the instruction is a maintenance instruction, control the right-position electromagnet DT3 of the three-position four-way solenoid valve and the electromagnet DT1 of the two-position four-way solenoid valve to be energized. One of the rodless cavity and the rod cavity of the brush support oil cylinder is connected to the fuel tank through a hydraulic control check valve and the three-position four-way solenoid valve, and the other of the rodless cavity and the rod cavity of the brush support oil cylinder is connected to the output end of the oil pump through the two-position four-way solenoid valve and the three-position four-way solenoid valve. The hydraulic control check valve is reversely conducted under the action of the pressure oil, and the brush support oil cylinder acts to drive the brush to lower.

3. The brush operation height control method according to claim 2, characterized in that, it further includes a calibration step: Obtain road condition information; Control the right-position electromagnet DT3 of the three-position four-way solenoid valve to be energized. One of the rodless cavity and the rod cavity of the brush support oil cylinder is connected to the output end of the oil pump through a one-way valve, a pressure reducing valve, a two-position four-way solenoid valve and the three-position four-way solenoid valve, and the other of the rodless cavity and the rod cavity of the brush support oil cylinder is connected to the fuel tank through the two-position four-way solenoid valve; Adjust the outlet pressure of the pressure reducing valve in multiple times, and control the brush to perform a cleaning operation on the road condition at each adjustment. Select the position of the brush with the best cleaning effect as the operation position corresponding to the obtained road condition information, and use this operation position as the preset operation position corresponding to this road condition information.

4. A brush assembly, characterized in that, it includes: A connecting rod, the first end of the connecting rod is arranged on the body of the road sweeper so as to be rotatable relative to the body of the road sweeper; A brush arranged at the second end of the connecting rod; The brush floating hydraulic system according to claim 1, one of the cylinder body and the piston rod of the brush support oil cylinder of the brush floating hydraulic system is arranged on the body of the road sweeper so as to be rotatable relative to the body of the road sweeper, and the other of the cylinder body and the piston rod of the brush support oil cylinder is rotatably connected to the connecting rod. The connecting rod swings up and down with the telescopic movement of the brush support oil cylinder to drive the brush to lift and lower.

5. The brush assembly according to claim 4, characterized in that, it further includes an adjusting rod, the length of the adjusting rod is adjustable, and the first end of the adjusting rod is arranged on the body of the road sweeper so as to be rotatable relative to the body of the road sweeper. The second end of the adjusting rod and the second end of the connecting rod are respectively rotatably connected to the brush, and the brush rotates relative to the connecting rod with the telescopic movement of the adjusting rod.

6. The brush assembly according to claim 5, characterized in that, it further includes an installation member for arranging the brush assembly on the body of the road sweeper. One of the cylinder body and the piston rod of the brush support oil cylinder, the first end of the adjusting rod and the first end of the connecting rod are respectively rotatably connected to the installation member.

7. The brush assembly according to claim 6, characterized in that, The installation component includes a fixed frame, a rotating frame, and a driving device. The rotating frame is rotatably arranged on the fixed frame. The fixed frame is used to be arranged on the body of the road sweeper. One of the cylinder body and the piston rod of the road sweeper support oil cylinder, the first end of the adjusting rod, and the first end of the connecting rod are respectively rotatably connected to the rotating frame. The rotation axis of the rotating frame relative to the fixed frame is perpendicular to the rotation axis of the connecting rod relative to the rotating frame. The driving device is arranged on the fixed frame or the body of the road sweeper, and the output end of the driving device is connected to the rotating frame to drive the rotating frame to rotate relative to the fixed frame.

8. A road sweeper, characterized in that it includes the road sweeper assembly according to any one of claims 4-7.

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