Hydraulic system for cleaning equipment
By designing a hydraulic system for cleaning equipment, including a sweeping disc speed control unit, an automatic obstacle avoidance oil circuit and a sweeping disc lifting unit, the problem that the sweeping disc cannot effectively rise and avoid obstacles when encountering obstacles such as steps are solved, and the automatic obstacle avoidance and energy saving and consumption reduction of sweeping discs are achieved.
Patent Information
- Application Number
- CN202520200793.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2035-02-10
AI Technical Summary
When existing sweepers encounter obstacles such as steps, the hydraulic system's pressure setting and response speed are insufficient, resulting in the sweeper being unable to effectively rise and avoid obstacles, resulting in the wear of bristles, deformation of the disc body and damage to key components.
A hydraulic system for cleaning equipment is designed, including a sweeping disc speed control unit, an automatic obstacle avoidance oil circuit and a sweeping disc lifting unit. The automatic obstacle avoidance oil circuit realizes automatic rise and fall of the sweeping disc through the pressure relief valve and sweeping disc lifting unit, ensuring that sweeping disc can effectively avoid obstacles.
The automatic rise and fall of the sweeper when encountering obstacles and automatically falls after passing obstacles, avoid unnecessary movements, extend the service life of the equipment, ensure the continuity of cleaning work, and save energy.
Smart Images
Figure CN222596441U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a hydraulic system, in particular to a hydraulic system used for cleaning equipment. Background Art
[0002] Hydraulic oil circuits play a key role in road sweepers. The lifting, rotation and speed regulation of the sweeping disc rely on hydraulic oil circuits. When the road sweeper is operating, the hydraulic pump draws oil from the oil tank, pressurizes it and transmits it to each hydraulic valve through pipelines. For example, the sweeping disc lifting valve controls the lifting and lowering of the sweeping disc, which facilitates the operation of the road sweeper under different road conditions; the sweeping disc speed regulating valve can adjust the sweeping disc speed to meet different garbage cleaning needs. In addition, the lifting and unloading of the garbage collection box of the road sweeper are also driven by the hydraulic system. The stable operation of the hydraulic oil circuit ensures the efficient cooperation of various components of the road sweeper, improves the cleaning efficiency and operation quality, and makes cleaning work easier and more convenient.
[0003] In existing sweeper technology, the sweeping disc often cannot effectively rise to avoid obstacles when encountering steps during sweeping. On the one hand, the pressure setting and response speed of the hydraulic system are insufficient. When the sweeping disc hits a step, there is no corresponding component in the hydraulic system and the sweeping disc cannot be quickly raised. On the other hand, there may be defects in the mechanical structure design, resulting in the sweeping disc being blocked from rising. This causes the sweeping disc to continuously collide and rub against the steps, which can easily cause bristle wear, disc deformation, and even damage to key components, affecting the normal operation and service life of the sweeper. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides a hydraulic system for cleaning equipment, which can realize automatic rising of a sweeping disc when encountering an obstacle and automatic falling after passing the obstacle.
[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a hydraulic system for cleaning equipment, including a sweeping disc speed regulating unit connected to a main input oil circuit, the sweeping disc speed regulating unit is provided with at least two output oil circuits, and each output oil circuit is provided with a speed regulating valve for adjusting the amount of fluid passing through, the sweeping disc speed regulating unit is also provided with a switching valve for connecting different oil circuit output ports through electrical signal switching, and the switching number of the switching valve corresponds to the number of output oil circuits, an automatic obstacle avoidance oil circuit can be arranged in parallel on each output oil circuit of the sweeping disc speed regulating unit, the automatic obstacle avoidance oil circuit includes a sweeping disc lifting unit and a pressure reducing relief valve for controlling the lifting of the sweeping disc, the fluid on the output oil circuit of the sweeping disc speed regulating unit first passes through the pressure reducing relief valve and then flows into the sweeping disc lifting unit, and the pressure reducing relief valve is used to prevent low-pressure fluid from entering the sweeping disc lifting unit.
[0006] The beneficial effects of the utility model are as follows: in terms of working principle, when the sweeping disc rotates at a certain speed, under normal circumstances, the fluid pressure in the main oil circuit is stable, the pressure reducing relief valve is closed, and the sweeping disc speed regulating unit controls the output flow through the speed regulating valve to keep the sweeping disc at the set speed. When the sweeping disc encounters an obstacle, the fluid pressure in the main oil circuit rises and reaches the opening pressure of the pressure reducing relief valve. The valve opens to provide fluid input to the sweeping disc lifting unit, driving the sweeping disc to rise and avoid obstacles. After passing the obstacle, the pressure in the main oil circuit is restored, the pressure reducing relief valve is closed, and the sweeping disc descends by its own gravity. The beneficial effects brought about by this are that the sweeping disc is avoided from being frequently lifted and lowered when encountering small obstacles such as stones on the road, unnecessary movements are reduced, and the service life of the equipment is extended. At the same time, the reliable obstacle-passing mechanism enables the sweeping disc to effectively avoid larger obstacles and ensure the continuity of the cleaning work. Moreover, the sweeping disc's own gravity is utilized to reduce energy, simplify the system structure, reduce costs, and improve the overall performance and work efficiency of the cleaning equipment.
[0007] Furthermore, the sweeping disc lifting unit is provided with an oil circuit for controlling the rise and an oil circuit for controlling the descent, and a switching valve connected to different oil circuit output ports through electrical signal switching, and at least one speed regulating valve is provided in the oil circuit for controlling the rise, and a one-way valve for preventing the backflow of the fluid in the oil circuit for controlling the rise is provided between the input end and the switching valve of the unit of one of the several speed regulating valves which is closest to the switching valve of the unit.
[0008] This structural design of the sweeping disc lifting unit brings many advantages. The oil circuits that control the rise and fall respectively, and the valves switched by electrical signals, can realize the precise control of the sweeping disc lifting action, and meet the flexible adjustment requirements of the sweeping disc height in different cleaning scenarios. The setting of the speed regulating valve is crucial, which can adjust the oil flow, so as to accurately control the speed of the sweeping disc rising. This can not only avoid the impact and damage of the equipment caused by the rising speed being too fast, but also ensure that the sweeping disc can be quickly lifted when needed, thereby improving the cleaning efficiency. A one-way valve is set at the input end of the speed regulating valve near the switching valve to effectively prevent the backflow of the fluid in the control rising oil circuit. This enables the system to stably maintain the height of the sweeping disc after the rising action is completed, avoiding the accidental drop of the sweeping disc due to oil reflux, and further improving the stability of the entire hydraulic system and the reliability of the cleaning operation.
[0009] Furthermore, an external control oil passage is provided on the oil passage for controlling descent in the sweeping disc lifting unit, one end of which is connected to a one-way valve in the oil passage for controlling ascent and is connected to an inlet end of the one-way valve.
[0010] First, after the switching valve of the sweeping disc lifting unit switches the oil circuit, the external control oil channel can be connected to the oil circuit used to control the rise to control the rise of the sweeping disc through external fluid input, and the stability of the sweeping disc lifting unit is improved by connecting the external control fluid. In addition, it cleverly constructs the connection between the two oil circuits, which helps to balance the pressure of the rising and falling oil circuits. During the descent of the sweeping disc by gravity, the connection structure can make the descent action smoother with the help of partial pressure characteristics of the rising oil circuit, avoiding the loss of control of the descent speed due to sudden changes in pressure. At the same time, this connection method further enhances the stability of the entire system, and works in synergy with previous speed control valves, one-way valves and other components to allow the sweeping disc to operate accurately and reliably during the lifting process, thereby comprehensively improving the working performance and efficiency of the cleaning equipment.
[0011] Furthermore, it also includes an auxiliary input oil circuit, which is connected between the pressure reducing relief valve and the sweeping disc lifting unit and provides fluid input for the sweeping disc lifting unit.
[0012] In terms of working principle, under normal circumstances, the sweeping disc lifting and lowering mainly relies on the pressure change when the main oil circuit encounters an obstacle, and the pressure relief valve is opened to drive the sweeping disc lifting and lowering unit. When the main oil circuit fails or other special circumstances occur, the auxiliary input oil circuit can be directly connected between the pressure relief valve and the sweeping disc lifting and lowering unit to provide independent fluid input for the sweeping disc lifting and lowering unit. The benefit of this design is that it provides an emergency solution. When the main oil circuit fails and cannot drive the sweeping disc to rise and fall, the sweeping disc lifting and lowering operation can be completed independently through the auxiliary input oil circuit, ensuring that the cleaning equipment can still perform basic sweeping disc lifting and lowering actions under special circumstances, maintain a certain working capacity, and avoid the equipment from being completely unable to operate. In addition, the addition of the auxiliary input oil circuit improves the reliability and redundancy of the system. When encountering complex working conditions or sudden failures in the main oil circuit, it can quickly switch to the backup oil supply mode, reduce equipment downtime, and improve the stability and continuity of the cleaning work. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the hydraulic oil circuit of an embodiment of the utility model;
[0014] Figure 2 This is a schematic diagram of the automatic obstacle avoidance oil circuit of an embodiment of the utility model. DETAILED DESCRIPTION
[0015] It should be noted that in this embodiment, the input port of the main input oil circuit is P5, and the input port of the auxiliary input oil circuit is PG. In the following, P5 refers to the main input oil circuit, and PG refers to the auxiliary input oil circuit. At the same time, PG can also be used as a pressure measuring port to connect a pressure measuring instrument to measure the pressure value of a specific position in the hydraulic system, so as to monitor the working pressure state of the system, detect pressure anomalies in time, and ensure the stable and safe operation of the hydraulic system.
[0016] The utility model embodiment of a hydraulic system for cleaning equipment such as Figure 1 - 2: It includes a sweeping disc speed regulating unit 1 connected to the main input oil circuit P5, and at least two output oil circuits are provided in the sweeping disc speed regulating unit 1, and a speed regulating valve for adjusting the amount of fluid passing through is provided on each output oil circuit. A switching valve 11 is also provided in the sweeping disc speed regulating unit 1 for switching the output ports of different oil circuits through electrical signals, and the switching number of the switching valve 11 corresponds to the number of output oil circuits. An automatic obstacle avoidance oil circuit 2 can be provided in parallel on each output oil circuit in the sweeping disc speed regulating unit 1, that is, an automatic obstacle avoidance oil circuit 2 can be provided in parallel on one or more output oil circuits to achieve obstacle avoidance at some commonly used speeds to simplify the structure, and an automatic obstacle avoidance oil circuit 2 can be provided in parallel on all output oil circuits to achieve automatic obstacle avoidance at all speeds.
[0017] The automatic obstacle avoidance oil circuit 2 includes a sweeping disc lifting unit 22 and a pressure reducing relief valve 21 for controlling the lifting of the sweeping disc. The fluid on the output oil circuit of the sweeping disc speed regulating unit 1 first passes through the pressure reducing relief valve 21 and then flows into the sweeping disc lifting unit 22. Therefore, the low-pressure fluid input will be blocked by the pressure reducing relief valve 21, thereby avoiding the sweeping disc from being lifted and lowered frequently. After the pressure reducing relief valve 21 is turned on by the fluid exceeding the set threshold value, the fluid is input into the sweeping disc lifting unit 22 so that the sweeping disc lifting unit 22 controls the sweeping disc to rise.
[0018] The sweeping disc lifting unit 22 is provided with an oil circuit (A1) for controlling the rise and an oil circuit (B1) for controlling the descent, and a switching valve 221 that switches and connects different oil circuit output ports through electrical signal switching. At least one speed regulating valve 224 is provided in the oil circuit (A1) for controlling the rise, and a one-way valve 222 for preventing the fluid in the oil circuit (A1) for controlling the rise is provided between its input end and the switching valve 221 of the unit among the several speed regulating valves 224 closest to the switching valve 221 of the unit. The one-way valve 222 is provided on the oil circuit (B1) for controlling the descent, and one end of the external control oil passage 223 is connected to the one-way valve 222 in the oil circuit (A1) for controlling the rise and the inlet end of the one-way valve 222. This embodiment also includes a secondary input oil circuit PG, which is connected between the pressure reducing relief valve 21 and the sweeping disc lifting unit 22 and directly provides fluid input for the sweeping disc lifting unit 22.
[0019] The use process of this embodiment is as follows: when the sweeping disc rotates at a certain speed, that is, when the sweeping disc is driven to rotate by one of the output oil circuits in the sweeping disc speed regulating unit 1, if an obstacle with a certain height such as a step is encountered, the fluid pressure in the oil circuit rises rapidly to conduct the pressure reducing relief valve 21, thereby driving the sweeping disc to rise through the sweeping disc lifting unit 22; after passing the obstacle, the sweeping disc descends by gravity, and at this time the external control oil channel 223 can stabilize the descending speed of the sweeping disc to prevent it from hitting the ground.
[0020] It should be noted that the switching valve 221 in the sweeping disc lifting unit 22 is always connected to the oil circuit for controlling the rise when the main input oil circuit provides fluid input, and when the auxiliary input oil circuit provides fluid input, it can switch the connected oil circuit as needed.
[0021] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.
Claims
1. A hydraulic system for cleaning equipment, comprising a sweeping disc speed regulating unit connected to a main input oil circuit, characterized in that: At least two output oil circuits are arranged in the sweeping disc speed regulating unit, and a speed regulating valve for adjusting the amount of fluid passing through is arranged on each output oil circuit. A switching valve for connecting different oil circuit output ports through electrical signal switching is also arranged in the sweeping disc speed regulating unit, and the switching number of the switching valve is set corresponding to the number of output oil circuits. An automatic obstacle avoidance oil circuit can be arranged in parallel on each output oil circuit in the sweeping disc speed regulating unit, and the automatic obstacle avoidance oil circuit comprises a sweeping disc lifting unit and a pressure reducing relief valve for controlling the lifting of the sweeping disc. The fluid on the output oil circuit of the sweeping disc speed regulating unit first passes through the pressure reducing relief valve and then flows into the sweeping disc lifting unit. After the pressure reducing relief valve is fluid-conducted, the fluid is input into the sweeping disc lifting unit so that the sweeping disc lifting unit controls the sweeping disc to rise.
2. The hydraulic system for cleaning equipment according to claim 1, characterized in that: The sweeping disc lifting unit is provided with an oil circuit for controlling the rise and an oil circuit for controlling the descent, and a switching valve connected to different oil circuit output ports through electrical signal switching. The oil circuit for controlling the rise is provided with at least one speed regulating valve, and one of the several speed regulating valves closest to the switching valve of the unit is provided with a one-way valve between its input end and the switching valve of the unit for preventing the backflow of the fluid in the oil circuit for controlling the rise.
3. The hydraulic system for cleaning equipment according to claim 2, characterized in that: An external control oil passage is arranged on the oil passage for controlling the descent in the sweeping disc lifting unit, one end of which is connected to a one-way valve in the oil passage for controlling the ascent and is connected to the inlet end of the one-way valve.
4. The hydraulic system for cleaning equipment according to claim 2, characterized in that: The invention also comprises an auxiliary input oil circuit, which is connected between the pressure reducing relief valve and the sweeping disc lifting unit and provides fluid input for the sweeping disc lifting unit.