Suction sweeping machine sweeping disc lifting oil cylinder hydraulic control loop and suction sweeping machine
By designing a hydraulic control circuit for the lifting cylinder of the sweeper disc, and using a pressure reducing overflow valve and a safety valve to stabilize the cylinder pressure, combined with road surface detection sensors to adjust the height and angle of the sweeper disc, the stability problem of the sweeper disc system in complex environments was solved, achieving stable support of the sweeper disc and system safety.
Patent Information
- Application Number
- CN202520423860.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-12
AI Technical Summary
When encountering obstacles, potholes, or high-load operations, the sweeping disc system of a sweeper truck is prone to problems such as excessive pressure and excessive load in the cylinder and hydraulic system, leading to system instability.
A hydraulic control circuit for the lifting cylinder of a sweeper disc was designed, including a lifting adjustment oil circuit, a solenoid directional valve, a pressure reducing overflow valve, a safety valve, and a road surface detection sensor. The solenoid directional valve controls the flow of hydraulic oil, and the pressure reducing overflow valve and safety valve ensure that the cylinder pressure is within a suitable range. The road surface detection sensor is used to adjust the height and angle of the sweeping disc in real time.
It achieves stable support for the sweeping disc under different ground conditions, reduces wear, ensures the safety and reliability of the hydraulic system, and automatically adjusts the height and angle of the sweeping disc to adapt to ground undulations.
Smart Images
Figure CN223854571U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of cleaning vehicle, especially to a kind of suction sweeper sweep disc lifting oil cylinder hydraulic control loop and suction sweeper. BACKGROUND
[0002] As one of the key equipment of urban environmental cleaning, cleaning vehicle is widely used in ground cleaning operation in municipal road and other places. One of the key components of cleaning vehicle is its sweep disc system, and sweep disc realizes the cleaning requirement of different height on ground by oil cylinder lifting. However, in the working process of cleaning vehicle, the sweep disc system needs to bear different working load and complex environmental conditions, especially when encountering obstacles, potholes or high-load operation, the oil cylinder and hydraulic system are prone to problems such as excessive pressure and excessive load. In order to protect the hydraulic system and related components, a suitable hydraulic control loop is needed to ensure the safe and stable operation of the system. SUMMARY
[0003] In order to solve the above technical problems, the utility model provides a kind of suction sweeper sweep disc lifting oil cylinder hydraulic control loop and suction sweeper, and the specific technical scheme is:
[0004] A kind of suction sweeper sweep disc lifting oil cylinder hydraulic control loop, comprising:
[0005] Sweep disc lifting oil cylinder;
[0006] Lifting adjustment oil circuit, including oil tank, electromagnetic reversing valve and pressure relief overflow valve, the electromagnetic reversing valve is connected the oil tank, the rodless cavity of sweep disc lifting oil cylinder and the oil inlet of pressure relief overflow valve, the oil outlet of pressure relief overflow valve is connected the rodless cavity of sweep disc lifting oil cylinder, and the overflow port of pressure relief overflow valve is connected the oil tank;
[0007] Safety valve, the oil inlet of safety valve is connected the oil outlet of pressure relief overflow valve, and the oil outlet of safety valve is connected the oil tank.
[0008] Preferably, the preset pressure of the pressure relief overflow valve is the first pressure, and the preset pressure of the safety valve is the second pressure, and the second pressure is greater than the first pressure.
[0009] Preferably, the first pressure is 25bar, and the second pressure is 100bar.
[0010] Preferably, the lifting adjustment oil circuit further comprises a direction control valve, the oil inlet of the direction control valve is connected to the oil outlet of the pressure relief overflow valve, and the oil outlet of the direction control valve is connected to the rodless cavity of the sweep disc lifting oil cylinder.
[0011] Preferably, the sweeping disc lifting oil cylinder comprises a height adjusting oil cylinder for adjusting the height of the sweeping disc and an angle adjusting oil cylinder for adjusting the angle of the sweeping disc, and the lifting adjusting oil path and the safety valve have two groups, and the height adjusting oil cylinder and the angle adjusting oil cylinder are connected with one group of the lifting adjusting oil path and the safety valve respectively.
[0012] Preferably, the road surface detection sensor is electrically connected with the control chip, and the control chip is connected with the pressure relief overflow valve.
[0013] Preferably, the pressure relief overflow valve is a multi-stage pressure relief valve group comprising a plurality of pressure relief valves with different preset pressures, and the multi-stage pressure relief valve group is connected with the electromagnetic reversing valve through an electromagnetic selection valve.
[0014] Preferably, the oil pressure sensor is connected with the lifting adjusting oil path and the control chip, the control chip is connected with a servo valve and the alarm element, the servo valve is connected with the pressure relief overflow valve in parallel, and the alarm element is used for connecting a central control console of the sweeper.
[0015] The utility model also provides a kind of sweeper, including sweeper main body, swing rod, sweeping disc and the sweeper sweeping disc lifting oil cylinder hydraulic control loop as described above, the two ends of the swing rod are respectively hinged the sweeper main body and sweeping disc, the two ends of the height adjusting oil cylinder are respectively hinged the sweeper main body and swing rod, the two ends of the angle adjusting oil cylinder are respectively hinged the swing rod and sweeping disc, and the sweeper main body is equipped with central control console.
[0016] The utility model discloses a kind of sweepers, including sweeper main body, swing rod, sweeping disc and the sweeper sweeping disc lifting oil cylinder hydraulic control loop as described above, the two ends of the swing rod are respectively hinged the sweeper main body and sweeping disc, the two ends of the height adjusting oil cylinder are respectively hinged the sweeper main body and swing rod, the two ends of the angle adjusting oil cylinder are respectively hinged the swing rod and sweeping disc, and the sweeper main body is equipped with central control console. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the following embodiment or prior art description will be simply introduced, and obviously, the drawings in the following description are only some embodiments in the utility model, and other drawings can be obtained according to these drawings without creating creative labor for those skilled in the art.
[0018] Figure 1 The oil path schematic view of the sweeper sweeping disc lifting oil cylinder hydraulic control loop provided in the embodiments of the utility model is shown.
[0019] Figure 2 A structural block diagram of a suction sweeper disc lifting oil cylinder hydraulic control circuit is provided for the embodiment of the utility model;
[0020] Figure 3 A structural schematic diagram of a suction sweeper is provided for the embodiment of the utility model.
[0021] Reference signs
[0022] 10 - suction sweeper main body; 20 - swing rod; 30 - sweeper disc;
[0023] 1 - sweeper disc lifting oil cylinder; 11 - height adjusting oil cylinder; 12 - angle adjusting oil cylinder; 2 - lifting adjusting oil circuit; 21 - oil tank; 22 - electromagnetic reversing valve; 23 - pressure relief overflow valve; 24 - direction control valve; 3 - safety valve; 4 - road surface detection sensor; 5 - control chip; 6 - oil pressure sensor; 7 - alarm element; 8 - servo valve. DETAILED DESCRIPTION
[0024] In order for those skilled in the art to better understand the technical scheme of the utility model, the utility model is described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model.
[0025] It should be noted that: similar reference signs represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.
[0026] It should be noted that: similar reference signs represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.
[0027] In addition, the terms "horizontal", "vertical", "overhang" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0028] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term '' set '', '' install '', '' link '', '' connect '' should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through intermediate medium indirectly connect, can be two element inside intercommunication.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.
[0029] Please see Figure 1 And Figure 2 The embodiment provides a kind of suction sweeper disc lifting oil cylinder hydraulic control circuit, including sweeper disc lifting oil cylinder 1, lifting adjustment oil circuit 2 and safety valve 3.
[0030] Lifting adjustment oil circuit 2 includes oil tank 21, electromagnetic reversing valve 22 and pressure relief overflow valve 23, electromagnetic reversing valve 22 is connected oil tank 21, the rodless cavity of sweeper disc lifting oil cylinder 1 and the oil inlet of pressure relief overflow valve 23, the oil outlet of pressure relief overflow valve 23 is connected the rodless cavity of sweeper disc lifting oil cylinder 1, and the overflow port of pressure relief overflow valve 23 is connected oil tank 21.
[0031] The oil inlet of safety valve 3 is connected the oil outlet of pressure relief overflow valve 23, and the oil outlet of safety valve 3 is connected oil tank 21.
[0032] Wherein, safety valve 3 can be overload valve, P is the oil outlet of oil tank, T is the oil inlet of oil tank, hydraulic oil flows into oil circuit system from P port, and flows back into oil tank from T port, electromagnetic reversing valve 22 can be used to control oil circuit passage, when not needing to clean, electromagnetic reversing valve 22 can control P port and the rodless cavity of sweeper disc lifting oil cylinder 1 communication, and closes remaining oil circuit, to make sweeper disc lifting oil cylinder 1 elongation and thus lift sweeper disc, after lifting sweeper disc, close all oil circuit again, to fix sweeper disc at specified height;When needing to clean, electromagnetic reversing valve 22 controls P port and the oil inlet of pressure relief overflow valve 23 communication, and closes remaining oil circuit, so that hydraulic oil can flow into the rodless cavity of sweeper disc lifting oil cylinder 1 after pressure reduction, the pressure of pressure relief overflow valve 23 can be preset according to actual demand, so that the hydraulic flow after pressure reduction can provide suitable support force to sweeper disc after flowing into the rodless cavity of sweeper disc lifting oil cylinder 1.
[0033] During the cleaning operation, when the road surface has a sudden bump, the support force of the ground on the sweeping disc increases at this time, and the sweeping disc will rise. Specifically, when the support force of the ground on the sweeping disc increases, the support force of the sweeping disc lifting cylinder 1 on the sweeping disc decreases, the hydraulic oil pressure of the sweeping disc lifting cylinder 1 decreases, the hydraulic oil automatically flows into the rodless cavity of the sweeping disc lifting cylinder 1 through the electromagnetic reversing valve 22 and the pressure relief overflow valve 23, so that the hydraulic oil pressure of the sweeping disc lifting cylinder 1 increases, the sweeping disc lifting cylinder 1 elongates and pushes the sweeping disc to rise, until the support force of the sweeping disc lifting cylinder 1 on the sweeping disc returns to the set cylinder support force, and correspondingly, the support force of the ground on the sweeping disc decreases to the set ground support force.
[0034] During the cleaning operation, when the road surface has a sudden bump, the support force of the ground on the sweeping disc increases at this time, and the sweeping disc will rise. Specifically, when the support force of the ground on the sweeping disc increases, the support force of the sweeping disc lifting cylinder 1 on the sweeping disc decreases, the hydraulic oil pressure of the sweeping disc lifting cylinder 1 decreases, the hydraulic oil automatically flows into the rodless cavity of the sweeping disc lifting cylinder 1 through the electromagnetic reversing valve 22 and the pressure relief overflow valve 23, so that the hydraulic oil pressure of the sweeping disc lifting cylinder 1 increases, the sweeping disc lifting cylinder 1 elongates and pushes the sweeping disc to rise, until the support force of the sweeping disc lifting cylinder 1 on the sweeping disc returns to the set cylinder support force, and correspondingly, the support force of the ground on the sweeping disc decreases to the set ground support force.
[0035] The pressure relief overflow valve 23 can realize the pressure maintaining control of the pressure oil in the sweeping disc lifting cylinder 1, and in the cleaning process, the height of the sweeping disc can be adaptively and automatically adjusted according to the ground undulation, so that the relationship between the contact force and the relative height of the sweeping disc and the ground remains unchanged during the cleaning process, the terrain simulation function is realized, the abnormal wear of the sweeping disc caused by the sudden bump of the ground is reduced, and the reliable cleaning of the sweeping disc on the sudden pit of the ground is ensured; when the pressure relief overflow valve 23 fails or is damaged, the hydraulic oil can flow back to the oil tank 21 through the safety valve 3, thereby ensuring the safety of the entire oil circuit system.
[0036] The present embodiment connects the sweeping disc lifting cylinder 1 and the lifting adjusting oil circuit 2, and controls the direction of the hydraulic oil through the electromagnetic reversing valve 22 in the lifting adjusting oil circuit 2, so that the hydraulic oil can flow into the sweeping disc lifting cylinder 1 after being reduced in pressure by the pressure relief overflow valve 23, thereby providing appropriate support force for the sweeping disc, adaptively and automatically adjusting the height of the sweeping disc according to the ground undulation in the cleaning process, and making the hydraulic oil flow back to the oil tank 21 through the safety valve 3 when the pressure relief overflow valve 23 fails or is damaged, thereby ensuring the safety of the entire oil circuit system.
[0037] Further, the preset pressure of the pressure relief overflow valve 23 is a first pressure, and the preset pressure of the safety valve 3 is a second pressure, the second pressure being greater than the first pressure.
[0038] Further, the first pressure is 25 bar, and the second pressure is 100 bar.
[0039] Further, referring to Figure 1 , the lifting adjustment oil circuit 2 further comprises a directional control valve 24, an oil inlet of the directional control valve 24 is connected to an oil outlet of the pressure relief overflow valve 23, and an oil outlet of the directional control valve 24 is connected to a rodless cavity of the sweeping disc lifting oil cylinder 1.
[0040] Further, the sweeping disc lifting oil cylinder 1 comprises a height adjustment oil cylinder 11 for adjusting the height of the sweeping disc and an angle adjustment oil cylinder 12 for adjusting the angle of the sweeping disc, and the lifting adjustment oil circuit 2 and the safety valve 3 have two groups, the height adjustment oil cylinder 11 and the angle adjustment oil cylinder 12 are respectively connected to one group of the lifting adjustment oil circuit 2 and the safety valve 3, and the adjustment principles of the height adjustment oil cylinder 11 and the angle adjustment oil cylinder 12 are the same as described above, so they will not be described again. The two groups of lifting adjustment oil circuits 2 can share one oil tank 21, and the arrangement of the two adjustment oil cylinders makes the sweeping disc not only adjustable in height but also adjustable in angle, so it is more suitable for cleaning various undulating ground surfaces.
[0041] Further, it further comprises a road surface detection sensor 4 and a control chip 5, the road surface detection sensor 4 is electrically connected to the control chip 5, and the control chip 5 is connected to the pressure relief overflow valve 23.
[0042] Among them, the road surface detection sensor 4 can be a laser radar, an ultrasonic sensor or an image recognition sensor, etc., so as to monitor the road surface state below the sweeping brush in real time, identify the uneven conditions such as undulations and potholes of the road surface. Through the control chip 5 to analyze the road surface data, so as to adjust the pressure of the hydraulic oil in the oil circuit, to automatically adjust the height, angle and pressure of the sweeping mechanism.
[0043] Further, the pressure relief overflow valve 23 is a multi-stage pressure relief valve group, which comprises a plurality of pressure relief valves with different preset pressures, and the multi-stage pressure relief valve group is connected to the electromagnetic directional control valve 22 through an electromagnetic selector valve.
[0044] Exemplarily, the multi-stage pressure relief valve group can be pressure relief valves with preset pressure values of 15bar, 25bar and 30bar, and after the control chip 5 analyzes the road surface data, it can select a pressure relief valve with appropriate pressure through the electromagnetic selector valve, so as to control the size of the pressure flowing into the oil circuit system, and then provide appropriate support force for the sweeping disc.
[0045] Further, it further comprises an oil pressure sensor 6 and an alarm element 7, the oil pressure sensor 6 is connected to the lifting adjustment oil circuit 2 and the control chip 5, the control chip 5 is connected to a servo valve 8 and the alarm element 7, the servo valve 8 is connected in parallel with the pressure relief overflow valve 23, and the alarm element 7 is used to connect to the central control console of the suction sweeper.
[0046] Wherein, the oil pressure sensor 6 can send an electrical signal to the control chip 5 when the pressure relief overflow valve 23 fails or is damaged, i.e. the internal pressure of the oil circuit is too large, the control chip 5 can control the electromagnetic valve, close the pressure relief overflow valve 23, and open the servo valve 8 to simulate the flow regulating function of the pressure relief valve, thereby ensuring the normal operation of the oil circuit system, and at the same time sending an alarm signal to the workers in the sweeper through the alarm element 7 to remind the workers to repair in time.
[0047] Please see Figure 3 , the embodiment also provides a sweeper, comprising a sweeper body 10, a swing rod 20, a sweeping disc 30 and a sweeper sweeping disc lifting hydraulic control circuit as described above, both ends of the swing rod 20 are hingedly connected to the sweeper body 10 and the sweeping disc 30, both ends of the height adjusting oil cylinder 11 are hingedly connected to the sweeper body 10 and the swing rod 20, both ends of the angle adjusting oil cylinder 12 are hingedly connected to the swing rod 20 and the sweeping disc 30, and a central control console is arranged on the sweeper body 10.
[0048] Wherein, the swing rod 20 can be a link rod with a middle part bent, one end of the height adjusting oil cylinder 11 is hingedly connected to the middle part of the swing rod 20, so that the swing rod 20 swings when the height adjusting oil cylinder 11 extends or retracts, thereby controlling the lifting of the sweeping disc 30; the middle region of the sweeping disc 30 is hingedly connected to the end of the swing rod 20, and the edge region of the sweeping disc 30 is hingedly connected to the angle adjusting oil cylinder 12, so that when the edge of the sweeping disc 30 touches a raised or sunken ground, the change in support force can be fed back to the angle adjusting oil cylinder 12 in time, thereby controlling the extension and retraction of the angle adjusting oil cylinder 12 through the oil circuit system, and adjusting the angle of the sweeping disc 30.
[0049] Principle:
[0050] P is the oil outlet of the oil tank, and T is the oil inlet of the oil tank. Hydraulic oil flows into the oil circuit system from the P port and flows back into the oil tank from the T port. The electromagnetic reversing valve 22 can be used to control the oil circuit passage. When cleaning is not required, the electromagnetic reversing valve 22 can control the P port and the rodless cavity of the sweeping disc lifting oil cylinder 1 to be in communication, and the remaining oil circuits are closed, so that the sweeping disc lifting oil cylinder 1 is elongated to lift the sweeping disc. After the sweeping disc is lifted, all oil circuits are closed to fix the sweeping disc at a specified height. When cleaning is required, the electromagnetic reversing valve 22 controls the P port and the oil inlet of the pressure relief overflow valve 23 to be in communication, and the remaining oil circuits are closed, so that the hydraulic oil can flow into the rodless cavity of the sweeping disc lifting oil cylinder 1 after being reduced in pressure. The pressure of the pressure relief overflow valve 23 can be pre-set according to actual requirements, so that the reduced hydraulic flow can provide appropriate support force to the sweeping disc after flowing into the rodless cavity of the sweeping disc lifting oil cylinder 1.
[0051] During the cleaning operation, when the road surface has a sudden bump, the ground support force on the sweeping disc increases, and the sweeping disc will rise. Specifically, when the ground support force on the sweeping disc increases, the support force of the sweeping disc lifting cylinder 1 on the sweeping disc decreases, the hydraulic oil pressure of the sweeping disc lifting cylinder 1 decreases, the hydraulic oil automatically flows into the rodless cavity of the sweeping disc lifting cylinder 1 through the electromagnetic reversing valve 22 and the pressure relief overflow valve 23, so that the hydraulic oil pressure of the sweeping disc lifting cylinder 1 increases, the sweeping disc lifting cylinder 1 elongates and pushes the sweeping disc to rise, until the support force of the sweeping disc lifting cylinder 1 on the sweeping disc returns to the set cylinder support force, and correspondingly, the ground support force on the sweeping disc decreases to the set ground support force.
[0052] During the cleaning operation, when the road surface has a sudden bump, the ground support force on the sweeping disc increases, and the sweeping disc will rise. Specifically, when the ground support force on the sweeping disc increases, the support force of the sweeping disc lifting cylinder 1 on the sweeping disc decreases, the hydraulic oil pressure of the sweeping disc lifting cylinder 1 decreases, the hydraulic oil automatically flows into the rodless cavity of the sweeping disc lifting cylinder 1 through the electromagnetic reversing valve 22 and the pressure relief overflow valve 23, so that the hydraulic oil pressure of the sweeping disc lifting cylinder 1 increases, the sweeping disc lifting cylinder 1 elongates and pushes the sweeping disc to rise, until the support force of the sweeping disc lifting cylinder 1 on the sweeping disc returns to the set cylinder support force, and correspondingly, the ground support force on the sweeping disc decreases to the set ground support force.
[0053] The pressure relief overflow valve 23 can realize the pressure maintaining control of the pressure oil in the sweeping disc lifting cylinder 1. During the cleaning process, the height of the sweeping disc can be adaptively and automatically adjusted according to the ground undulation, so as to ensure that the contact force and the relative height relationship of the sweeping disc and the ground remain unchanged during the cleaning process, realize the terrain simulation function, reduce the abnormal wear of the sweeping disc caused by the sudden bump of the ground, and ensure that the sweeping disc can reliably clean the sudden pit of the ground. When the pressure relief overflow valve 23 fails or is damaged, the hydraulic oil can flow back to the oil tank 21 through the safety valve 3, thereby ensuring the safety of the entire oil circuit system.
[0054] It should be noted that in this paper, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.
[0055] The principle and implementation mode of the present application are described by using specific examples herein, and the above example is only used for helping to understand the method and core idea of the present application. The above is only the preferred implementation mode of the present application, and it should be pointed out that, due to the limited nature of the expression, there are objectively infinite specific structures, and for ordinary skilled persons in the technical field, without departing from the principle of the present application, some improvements, decorations or changes can be made, and the above technical features can be combined in an appropriate manner; the improvements, decorations, changes or combinations, or the direct application of the concept and technical solution of the present application to other occasions without improvement, should be regarded as the protection scope of the present application.
Claims
1. A suction sweeper disc lifting hydraulic control circuit, characterized in that, include: Sweeping disc lifting cylinder (1); The lifting and regulating oil circuit (2) includes an oil tank (21), an electromagnetic reversing valve (22), and a pressure reducing overflow valve (23). The electromagnetic reversing valve (22) is connected to the oil tank (21), the rodless chamber of the sweeping disc lifting cylinder (1), and the oil inlet of the pressure reducing overflow valve (23). The oil outlet of the pressure reducing overflow valve (23) is connected to the rodless chamber of the sweeping disc lifting cylinder (1), and the overflow port of the pressure reducing overflow valve (23) is connected to the oil tank (21). Safety valve (3), the oil inlet of the safety valve (3) is connected to the oil outlet of the pressure reducing relief valve (23), and the oil outlet of the safety valve (3) is connected to the oil tank (21).
2. The sweeper-mulcher disc lift ram hydraulic control circuit of claim 1, wherein, The preset pressure of the pressure reducing relief valve (23) is the first pressure, and the preset pressure of the safety valve (3) is the second pressure, the second pressure being greater than the first pressure.
3. The sweeper-mulcher disc lift ram hydraulic control circuit of claim 2, wherein, The first pressure is 25 bar, and the second pressure is 100 bar.
4. The sweeper-mulcher disc lift ram hydraulic control circuit of claim 1, wherein, The lifting and regulating oil circuit (2) also includes a directional control valve (24), the oil inlet of which is connected to the oil outlet of the pressure reducing overflow valve (23), and the oil outlet of which is connected to the rodless chamber of the sweeping disc lifting cylinder (1).
5. The sweeper-mulcher disc lift ram hydraulic control circuit of claim 1, wherein, The sweeping disc lifting cylinder (1) includes a height adjusting cylinder (11) for adjusting the height of the sweeping disc and an angle adjusting cylinder (12) for adjusting the angle of the sweeping disc. The lifting adjusting oil circuit (2) and the safety valve (3) are in two sets. The height adjusting cylinder (11) and the angle adjusting cylinder (12) are respectively connected to one set of the lifting adjusting oil circuit (2) and the safety valve (3).
6. The sweeper-mulcher disc lift ram hydraulic control circuit of claim 5, wherein, It also includes a road surface detection sensor (4) and a control chip (5), wherein the road surface detection sensor (4) is electrically connected to the control chip (5), and the control chip (5) is connected to the pressure relief valve (23).
7. The sweeper-mulcher disc lift ram hydraulic control circuit of claim 6, wherein, The pressure reducing relief valve (23) is a multi-stage pressure reducing valve group, which includes multiple pressure reducing valves with different preset pressures. The multi-stage pressure reducing valve group is connected to the electromagnetic directional valve (22) through an electromagnetic selector valve.
8. The sweeper-mulcher disc lift ram hydraulic control circuit of claim 6, wherein, It also includes an oil pressure sensor (6) and an alarm element (7). The oil pressure sensor (6) is connected to the lifting and regulating oil circuit (2) and the control chip (5). The control chip (5) is connected to a servo valve (8) and the alarm element (7). The servo valve (8) is connected in parallel with the pressure relief valve (23). The alarm element (7) is used to connect to the central control panel of the vacuum sweeper.
9. A suction sweeper characterised in that, The sweeper includes a main body (10), a swing arm (20), a sweeping disc (30), and a hydraulic control circuit for lifting the sweeping disc as described in claim 8. The two ends of the swing arm (20) are respectively hinged to the main body (10) and the sweeping disc (30). The two ends of the height adjustment cylinder (11) are respectively hinged to the main body (10) and the swing arm (20). The two ends of the angle adjustment cylinder (12) are respectively hinged to the swing arm (20) and the sweeping disc (30). The main body (10) of the sweeper is equipped with a central control panel.