阅读说明：本技术 环卫清扫车液压控制系统 (Hydraulic control system of environmental sanitation sweeper ) 是由 姜洪 王震山 魏宏宇 李贺 刘占远 史浙安 陈钊汶 于 2019-07-29 设计创作，主要内容包括：一种环卫清扫车液压控制系统。解决了现有清扫车系统能量损耗大,结构复杂,同步性能差以及不能实现模块化的问题。它包括吸口阀组、进回油阀组和工作阀组,所述的进回油阀组包括主进油口、回油口、压力补偿阀、分流阀、比例电磁阀和主溢流阀,压力补偿阀,用于实现流量的分配,并用以完成吸口阀组的吸口和工作阀组的执行机构复合动作；分流阀,用于实现满足工作需要以外的流量进行低压卸荷；比例电磁阀,用于实现对输出流量的控制以控制工作阀组的执行机构速度。本发明还具有可以快速、规模化生产加工,可以实现模块化生产装配,便于组织生产,结构简单、便于装配,动作可靠,系统能耗小,同步性能好,使用寿命长等优点。(A hydraulic control system of a sanitation sweeper. The problem of current motor sweeper system energy loss big, the structure is complicated, the synchronism is poor and can not realize the modularization is solved. The pressure compensation valve is used for realizing flow distribution and is used for completing the compound action of a suction port of the suction port valve group and an actuating mechanism of the working valve group; the flow divider is used for realizing low-pressure unloading of flow beyond the requirement of work; and the proportional solenoid valve is used for realizing the control of output flow so as to control the speed of an actuating mechanism of the working valve group. The invention also has the advantages of rapid and large-scale production and processing, realization of modularized production and assembly, convenient organization and production, simple structure, convenient assembly, reliable action, low system energy consumption, good synchronization performance, long service life and the like.)

1. A hydraulic control system of a sanitation sweeper is characterized by comprising a suction port valve set, an oil inlet and return valve set and a working valve set, wherein the oil inlet and return valve set comprises a main oil inlet, an oil return port, a pressure compensation valve, a flow divider valve, a proportional solenoid valve and a main overflow valve,

the pressure compensation valve is used for realizing flow distribution and finishing the combined action of a suction port of the suction port valve group and an actuating mechanism of the working valve group;

the flow divider is used for realizing low-pressure unloading of flow beyond the requirement of work;

the proportional solenoid valve is used for realizing the control of output flow so as to control the speed of an actuating mechanism of the working valve group;

and the main overflow valve is used for protecting the hydraulic system under the overload limit working condition.

2. The hydraulic control system of the environmental sanitation sweeper truck as recited in claim 1, wherein the set of inlet and return valves includes an electromagnetic unloader valve,

and the electromagnetic unloading valve is used for realizing unloading in a non-working state.

3. The environmental sanitation sweeper hydraulic control system of claim 1, wherein the hydraulic control system is characterized in that

The inlet of the pressure compensation valve is communicated with the main oil inlet, the first outlet of the pressure compensation valve is respectively connected with the suction valve bank for controlling the suction action of the suction valve bank, and is communicated with the control cavity of the pressure compensation valve for controlling the opening size of the valve core of the pressure compensation valve, and the second outlet of the pressure compensation valve is respectively communicated with the flow divider valve and the proportional solenoid valve, is unloaded by the low pressure of the flow divider valve and is connected with the actuating mechanism of the working valve bank by the proportional solenoid valve.

4. The hydraulic control system of the environmental sanitation sweeper truck as recited in claim 3, wherein the second outlet of the pressure compensating valve is in communication with a diverter valve control chamber, and a diverter valve spring chamber receives working oil path feedback oil and cooperates with pressurized oil at the diverter valve control chamber to balance the opening size of the diverter valve spool.

5. The hydraulic control system of the environmental sanitation sweeper truck of claim 3, wherein the oil inlet and return valve bank comprises an LS overflow valve,

and the LS overflow valve is used for cutting off an oil way after the suction port of the suction port valve group is folded or put in place.

6. The hydraulic control system for a sanitation sweeper truck according to claim 5, wherein the suction port valve set comprises a suction port reversing valve, an inlet of the suction port reversing valve is connected with a first outlet of the pressure compensation valve, an outlet of the suction port reversing valve is respectively connected with a suction port of the suction port valve set and an inlet of the LS overflow valve, and an outlet of the LS overflow valve is communicated with the oil return port.

7. The hydraulic control system for the environmental sanitation sweeper truck according to claim 6, wherein an outlet of the suction port reversing valve is communicated with the oil return port through a throttle hole.

8. The hydraulic control system for the environmental sanitation sweeper truck as recited in claim 6, wherein an outlet of the suction port reversing valve is communicated with a pressure compensating valve spring chamber and cooperates with a pressure compensating valve control chamber to control the opening size of a valve core of the pressure compensating valve.

9. The hydraulic control system of a sanitation sweeper truck according to claim 2, wherein the main overflow valve and the electromagnetic unloading valve are both arranged between the main oil inlet and the oil return port, the electromagnetic unloading valve is a two-position two-way electromagnetic directional valve, and the proportional solenoid valve is a three-way proportional solenoid valve.

10. The hydraulic control system for a sanitation sweeper truck according to claim 1, wherein the suction valve block and the working valve block are disposed on left and right sides of the oil inlet and return valve block, the working valve block includes a plurality of working units, and different working units are disposed in parallel.

Technical Field

The invention relates to a sanitation sweeper, in particular to a hydraulic control system of the sanitation sweeper.

Background

The road sweeper is a novel efficient sweeping device integrating road surface sweeping, garbage recycling and transporting. The vehicle is characterized in that a vehicle type with road sweeping and water spraying functions is modified on a special vehicle chassis, an auxiliary engine is additionally arranged on the vehicle except a chassis engine, and a sweeper is driven by a hydraulic motor to work and is provided with various matched devices such as a fan, a garbage can, a water tank and the like. The novel vehicle type can complete the work of cleaning the ground, cleaning the curb of the road, sprinkling water to the ground after cleaning and the like at one time, and is suitable for cleaning operation of various climates and different dry pavements.

The hydraulic system of current sanitation road sweeper is mostly the integrated valve piece that the board-like electromagnetism of switch formula superposes the valve and is given first place to, and product overall control module design processing is troublesome, and this hydraulic system has following shortcoming:

1. the redundant flow of the oil inlet and return throttling speed regulation actuating mechanism is lost through the overflow of the main overflow valve, and the energy loss is large; if the actuator corresponding to the oil port a3/B3 in fig. 1 is the lifting and falling of the box body, the oil return throttling speed regulation (the oil return one-way throttle valve in the sequence III in fig. 1) is adopted, the flow required by the action of the loop actuator is small, part of the pressure oil output by the pump is supplied to the actuator in the action process of the actuator, and the redundant pressure oil overflows to the oil return box through the overflow valve (the sequence IV in fig. 1) at high pressure, so that great energy loss is generated, and the heat productivity is increased.

2. For a fixed displacement pump system, although the energy loss of the inlet oil and the return oil is not high, the system rigidity is low, and the speed of an actuating mechanism is easily influenced by load; for example, an actuating mechanism corresponding to an oil port A6/X/A7 in the figure 1 is the rotation of a sweeping motor, the sweeping motor has three different speed regulation requirements, and an oil inlet one-way throttle valve (a sequence I in the figure 1) and a shuttle valve (a sequence II in the figure 1) are connected in series to form a bypass throttling speed regulation loop. Under the extreme working condition that the sweeping load is very large, the bypass throttling is easy to cause the bypass flow to be too large, so that the condition that the action of an actuating mechanism is very slow or no action occurs.

3. According to the principle of the form shown in fig. 1, each actuating mechanism can only realize single action, cannot complete the composite action of the two actuating mechanisms, and always acts first with a small load. When the sweeping machine works, the sweeping and the sucking of the suction port can not be finished at the same time.

4. Due to different system principles, the integrated valve block cannot realize the modularized production of similar principle function requirements aiming at sweeping vehicles with different tonnage.

Disclosure of Invention

The invention provides a hydraulic control system of a sanitation sweeper, which aims to solve the problems that the existing sweeper system in the background technology is large in energy loss, complex in structure, poor in synchronization performance and incapable of realizing modularization.

The technical scheme of the invention is as follows: a hydraulic control system of a sanitation sweeper comprises a suction port valve set, an oil inlet and return valve set and a working valve set, wherein the oil inlet and return valve set comprises a main oil inlet, an oil return port, a pressure compensation valve, a flow divider valve, a proportional solenoid valve and a main overflow valve,

the pressure compensation valve is used for realizing flow distribution and finishing the combined action of a suction port of the suction port valve group and an actuating mechanism of the working valve group;

the flow divider is used for realizing low-pressure unloading of flow beyond the requirement of work;

the proportional solenoid valve is used for realizing the control of output flow so as to control the speed of an actuating mechanism of the working valve group;

and the main overflow valve is used for protecting the hydraulic system under the overload limit working condition.

As an improvement of the invention, the oil inlet and return valve group comprises an electromagnetic unloading valve,

and the electromagnetic unloading valve is used for realizing unloading in a non-working state.

As a further improvement of the invention, the inlet of the pressure compensation valve is communicated with the main oil inlet, the first outlet of the pressure compensation valve is respectively connected with the suction valve bank for controlling the suction action of the suction valve bank and is communicated with the control cavity of the pressure compensation valve for controlling the opening size of the valve core of the pressure compensation valve, and the second outlet of the pressure compensation valve is respectively communicated with the flow dividing valve and the proportional solenoid valve, is unloaded by the low pressure of the flow dividing valve and is connected with the actuating mechanism of the working valve bank by the proportional solenoid valve.

As a further improvement of the invention, the second outlet of the pressure compensation valve is communicated with the control cavity of the diverter valve, and the spring cavity of the diverter valve receives the feedback oil of the working oil path and is matched with the pressure oil at the control cavity of the diverter valve to balance the opening size of the valve core of the diverter valve.

As a further improvement of the invention, the oil inlet and return valve group comprises an LS overflow valve,

and the LS overflow valve is used for cutting off an oil way after the suction port of the suction port valve group is folded or put in place.

As a further improvement of the invention, the suction port valve group comprises a suction port reversing valve, an inlet of the suction port reversing valve is connected with a first outlet of the pressure compensation valve, an outlet of the suction port reversing valve is respectively connected with a suction port of the suction port valve group and an inlet of the LS overflow valve, and an outlet of the LS overflow valve is communicated with an oil return port.

As a further improvement of the invention, the outlet of the suction port reversing valve is communicated with the oil return port through a throttling hole.

As a further improvement of the invention, the outlet of the suction port reversing valve is communicated with the pressure compensation valve spring cavity and is matched with the pressure compensation valve control cavity to control the opening size of the valve core of the pressure compensation valve.

As a further improvement of the invention, the main overflow valve and the electromagnetic unloading valve are both arranged between the main oil inlet and the oil return port, the electromagnetic unloading valve is a two-position two-way electromagnetic directional valve, and the proportional electromagnetic valve is a three-way proportional electromagnetic valve.

As a further improvement of the invention, the suction valve group and the working valve group are arranged on the left side and the right side of the oil inlet and return valve group, the working valve group comprises a plurality of working couples, and different working couples are arranged in parallel.

The stepless speed regulation device has the advantages that stepless speed regulation can be realized through the proportional solenoid valve and the matching structure thereof, so that different output flows can meet the speed requirement required by an actuating mechanism in the working valve group; through the arrangement of the flow divider, the working oil line can be unloaded from the low pressure of the flow divider when unnecessary flow is not needed, and the system energy is small; meanwhile, the invention can realize the composite action of the suction valve set and the working valve set, and the action is reliable. The invention also has the advantages of rapid and large-scale production and processing, realization of modularized production and assembly, convenient organization and production, simple structure, convenient assembly, reliable action, low system energy consumption, good synchronization performance, long service life and the like.

Drawings

Fig. 1 is a schematic diagram of a hydraulic control system of a conventional sweeping machine.

Fig. 2 is a schematic structural diagram of a hydraulic control system of a conventional sweeping machine.

Fig. 3 is a hydraulic schematic of an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an embodiment of the present invention.

In the figure, 1, a pressure compensation valve; 2. a flow divider valve; 3. a proportional solenoid valve; 4. an electromagnetic unloading valve; 5. a main overflow valve; 6. an LS overflow valve; 7. a suction valve group; 71. a suction port reversing valve; 72. an orifice; 8. an oil inlet and return valve bank; 9. a working valve group; 91. a working unit; p, a main oil inlet; t, an oil return port.

Detailed Description

The embodiments of the invention will be further described with reference to the accompanying drawings in which:

referring to fig. 3 and fig. 4, a hydraulic control system for a sanitation sweeper comprises a suction valve set 7, an oil inlet and return valve set 8 and a working valve set 9, wherein the oil inlet and return valve set comprises a main oil inlet P, an oil return port T, a pressure compensating valve 1, a flow divider valve 2, a proportional solenoid valve 3 and a main overflow valve 5,

the pressure compensation valve is used for realizing flow distribution and finishing the combined action of a suction port of the suction port valve group and an actuating mechanism of the working valve group;

the flow divider is used for realizing low-pressure unloading of flow beyond the requirement of work;

the proportional solenoid valve is used for realizing the control of output flow so as to control the speed of an actuating mechanism of the working valve group;

and the main overflow valve is used for protecting the hydraulic system under the overload limit working condition. The stepless speed regulation device has the advantages that stepless speed regulation can be realized through the proportional solenoid valve and the matching structure thereof, so that different output flows can meet the speed requirement required by an actuating mechanism in the working valve group; through the arrangement of the flow divider, the working oil line can be unloaded from the low pressure of the flow divider when unnecessary flow is not needed, and the system energy is small; meanwhile, the invention can realize the composite action of the suction valve set and the working valve set, and the action is reliable. The invention also has the advantages of rapid and large-scale production and processing, realization of modularized production and assembly, convenient organization and production, simple structure, convenient assembly, reliable action, low system energy consumption, good synchronization performance, long service life and the like.

The oil inlet and return valve group comprises an electromagnetic unloading valve 4, and the electromagnetic unloading valve is used for realizing unloading in a non-working state. The structure ensures that the energy consumption is low when the product is unloaded in a non-working state, and the energy consumption is low when the product is unloaded in a neutral position.

The inlet of the pressure compensation valve 1 is communicated with the main oil inlet, the first outlet of the pressure compensation valve is respectively connected with the suction valve bank for controlling the suction action of the suction valve bank, and is communicated with the control cavity of the pressure compensation valve for controlling the opening size of the valve core of the pressure compensation valve, and the second outlet of the pressure compensation valve is respectively communicated with the flow dividing valve and the proportional solenoid valve, is unloaded by the low pressure of the flow dividing valve and is connected with the actuating mechanism of the working valve bank by the proportional solenoid valve. The structure enables the pressure compensation valve to realize flow distribution so as to complete the compound action of the suction port and other actuating mechanisms; the flow dividing valve can realize flow distribution to complete the composite action of the suction port and other actuating mechanisms; the proportional solenoid valve controls the output flow to control the speed of the actuator.

And a second outlet of the pressure compensation valve is communicated with the flow divider control cavity, and a flow divider spring cavity receives the feedback oil of the working oil way and is matched with the pressure oil at the flow divider control cavity to balance the size of an opening of a valve core of the flow divider. Therefore, the flow divider can realize low-pressure unloading of flow beyond the requirement of work, and energy consumption is reduced.

And the oil inlet and return valve group comprises an LS overflow valve 6 which is used for cutting off an oil way after a suction port of the suction port valve group is folded or put down in place. The LS overflow valve can cut off continuous oil supply of the main oil way after the suction port is folded or put in place, an oil cylinder is protected, and the safety is higher.

The suction port valve group 7 comprises a suction port reversing valve 71, an inlet of the suction port reversing valve is connected with a first outlet of the pressure compensation valve, an outlet of the suction port reversing valve is respectively connected with a suction port of the suction port valve group and an inlet of the LS overflow valve, and an outlet of the LS overflow valve is communicated with an oil return port. Specifically, the outlet of the suction port selector valve is communicated with the oil return port through a throttle hole 72. The structure ensures that the suction port valve group works reliably. More specifically, the outlet of the suction port reversing valve 71 is communicated with the pressure compensation valve spring cavity and is matched with the pressure compensation valve control cavity to control the opening size of the valve core of the pressure compensation valve. Therefore, the action of the suction port valve group can be reliably controlled, particularly, the suction port valve group can preferentially distribute flow in the combined action after being combined with a pressure compensation valve, and the influence on the sweeping speed is small while the suction port works because the flow required by the suction port is little.

The main overflow valve 5 and the electromagnetic unloading valve 4 are both arranged between the main oil inlet P and the oil return port T, the electromagnetic unloading valve is a two-position two-way electromagnetic directional valve, and the proportional electromagnetic valve is a three-way proportional electromagnetic valve. Specifically speaking, suction port valves 7 and service valve group 9 locate the left and right sides of advancing return valves 8, service valve group 9 include a plurality of work antithetical couplets 91, different work antithetical couplets set up. The parallel arrangement of the working connection is similar to the parallel connection of elements in a circuit, namely, the mutual working connection acts relatively independently without mutual influence, and the total input oil quantity is constant. The technical scheme of the invention is that a sheet type valve body assembling structure (as shown in figure 4) is adopted, aiming at sweeping machines with different tonnage and different function requirements, a plurality of working units can be expanded and added on the basis of an oil inlet and return valve group to realize the function requirements of different vehicle types, and the valve bodies of the working units can be rapidly produced and processed in a large scale, are convenient for organization and production and are convenient for assembly. Meanwhile, the function of the hydraulic system is conveniently expanded by adding the working valve group.

The hydraulic control system is suitable for sweeping vehicles and washing and sweeping vehicles with different tonnages, such as 1T, 3T, 5T, 8T and the like, and corresponding control work links are added on the basis of the principle for hydraulically controlling the spray rod and the water pump motor. Reference is now made to figures 3 and 4 for a further illustration of an 8T scrubber. Referring to the attached drawing 3, the work valve group sequentially comprises a box body work joint, a rear door work joint, a left sweeping plate work joint, a right sweeping plate work joint, a left sweeping brush work joint and a right sweeping brush work joint, and each work joint is controlled by a corresponding electromagnetic directional valve. The hydraulic principle of the invention in the form of the valve group of the road sweeper is applicable to the whole series of road sweepers, and the vehicle types with different tonnages are only slightly different in the number of the working links and the sequence of the corresponding actions of the working links.

The hydraulic control system is provided with the pressure compensation valve 1, so that the flow distribution can be realized, and the compound action of a suction port and other actuating mechanisms can be completed; the flow divider 2 can realize low-pressure unloading of flow beyond the requirement of work to reduce energy consumption; the three-way proportional electromagnetic valve 3 controls the output flow to control the speed of the actuating mechanism; the electromagnetic unloading valve 4 realizes unloading of the pump in a non-working state; the main overflow valve 5 realizes the protection of the pump and the hydraulic system under the limit working condition of overload; the LS overflow valve 6 can cut off the continuous oil supply of the main oil way after the suction port is folded or put down in place, so that the oil cylinder is protected.

1. The system aims at the problems that the energy loss and the heat productivity of the oil inlet and return of the original system and the throttling and speed regulation of a bypass are large, and the sweeper only has high, medium and low three-speed regulation. The control method of the invention adopts a control method that a three-way proportional electromagnetic valve 3 and a flow divider valve 2 are adopted in a main oil inlet path. Hydraulic oil is output by the pump, enters the main oil path through the P port, passes through the pressure compensation valve 1, reaches the three-way proportional solenoid valve 3 and the flow dividing valve 2, at the moment, the electromagnetic coils a0 and b5 are electrified, and the hydraulic oil passes through the three-way proportional solenoid valve and the sweeper solenoid valve, reaches the A5 port and drives the sweeper motor to rotate. The flow output by the three-way proportional solenoid valve is correspondingly increased or reduced by increasing or reducing the magnitude of the current value a0, so that the stepless speed regulation of the sweeper is realized. The speed regulation of actuating mechanisms such as a box body, a rear door, a sweeping disc and the like is the same as the speed regulation principle of a sweeping brush, and different flow rates are output to meet the speed requirement required by the actuating mechanisms by changing the magnitude of current input by the electromagnetic coil a 0.

2. When the sweeper or other actuating mechanisms need to work at a very slow speed, only little flow is needed for driving the actuating mechanisms to act at the moment, namely, the three-way proportional solenoid valve only needs to output little flow to the corresponding working connection. Since the pump output flow is constant, the excess flow is unloaded from the splitter valve 2. The LS1 feedback oil path is connected to the spring cavity of the flow divider by the working oil path, when the redundant hydraulic oil is divided by the flow divider, the oil is returned by unloading under the pressure close to the working load, the overflow loss of high-pressure overflow oil return is avoided, and the heat productivity of the hydraulic system is reduced.

3. The suction port and the sweeper cannot realize compound action, and the tilting suction cannot be realized when more road surface garbage is accumulated. The invention adopts a pressure compensation valve to realize the composite action of the suction port and the sweeper brush. When the road surface operation process of the sweeping machine is met and the garbage is accumulated more, the suction port is required to be lifted to a certain height to complete the adsorption of the garbage on the road surface. When the road sweeper works normally on the road surface, hydraulic oil entering through the P port passes through the pressure compensation valve and the three-way proportional solenoid valve along the main oil way to the sweeping brush working linkage to drive the sweeping brush to rotate to sweep the road surface, when large-volume garbage exists on the road surface, the sweeping brush continues to rotate to sweep the road surface at the moment, meanwhile, the electromagnetic coil a7 of the suction port reversing valve is electrified to enable the main oil way to be communicated with the B7 port, the hydraulic oil entering through the P port can be preferentially distributed to flow required by action of the suction port through the pressure compensation valve, the rest of flow can be simultaneously distributed to the sweeping brush working linkage through the three-way proportional solenoid valve, and the sweeping brush continues to sweep the road surface while the. The suction opening needs little flow when working, so the sweeping speed is little influenced when the suction opening tilts.

4. The invention adopts a sheet type valve body assembly structure (as shown in figure 4), aiming at the road sweeper with different tonnage and different function requirements, a plurality of working units can be expanded and added on the basis of an oil inlet and return valve group (oil inlet and return unit) to realize the function requirements of different vehicle types, and the valve body of the working unit can be rapidly produced and processed in a large scale, is convenient for organizing production and is convenient for assembly. Meanwhile, the function of the hydraulic system is conveniently expanded by adding the working valve group.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the invention has been described in terms of the above specific embodiments, the inventive concept is not limited thereto and any modification applying the inventive concept is intended to be included within the scope of the patent claims.