CN215927961U

CN215927961U - Hydraulic control system of climbing platform fire truck

Info

Publication number: CN215927961U
Application number: CN202122168925.5U
Authority: CN
Inventors: 李祥啟; 李文明; 张建国
Original assignee: Dayang Parking Co Ltd
Current assignee: Dayang Parking Co Ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-03-01
Anticipated expiration: 2031-09-09

Abstract

The embodiment of the utility model discloses a hydraulic control system of a fire truck with an ascending platform, belonging to the technical field of fire-fighting and rescue equipment. The utility model solves the technical problem that the existing power executing element is difficult to ensure stable and uninterrupted work, and is widely applied to high-altitude fire fighting or rescue.

Description

Hydraulic control system of climbing platform fire truck

Technical Field

The embodiment of the utility model relates to the technical field of fire fighting and rescue equipment, in particular to a hydraulic control system of a fire fighting truck with an ascending platform.

Background

At present, the power supply of the high-altitude fire-fighting and rescue vehicle comes from an engine, no matter walking power, rescue power and hydraulic power are realized by using a power pump driven by the engine, once the engine fails, the rescue work cannot be normally carried out, the safety of people or objects is endangered, and the inestimable loss is caused. In the rescue process, the load bearing capacity of each hydraulic and power executing element is changed continuously due to the continuous change of the load, and how each hydraulic and power executing element can work stably and continuously is also a great technical problem for technicians in the field.

Therefore, in the technical field of fire fighting and rescue equipment, there is still a need for research and improvement on the hydraulic control system of the elevating platform fire truck, which is also a research focus and emphasis in the technical field of fire fighting and rescue equipment at present and is the starting point for the completion of the present invention.

SUMMERY OF THE UTILITY MODEL

Therefore, the embodiment of the utility model provides a hydraulic control system of a fire truck of an ascending platform, which aims to solve the technical problem that the conventional power executing element is difficult to ensure stable uninterrupted work.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

according to the embodiment of the utility model, the hydraulic control system of the elevating platform fire truck comprises a telescopic arm which is hinged and installed at the tail part of an automobile chassis, wherein a turnover hydraulic cylinder for turning the telescopic arm is installed on the automobile chassis, front hydraulic support legs are respectively installed on the left side and the right side of the automobile chassis close to a cab of an automobile, an auxiliary support cylinder for lifting the telescopic arm is installed on the automobile chassis, rear hydraulic support legs are respectively installed on the left side and the right side of the telescopic arm far away from the cab of the automobile, transition hydraulic cylinders are respectively installed on the left side and the right side of the tail end of the automobile chassis, a plurality of lifting hydraulic cylinders are installed on the telescopic arm, the front hydraulic support legs, the rear hydraulic support legs, the transition hydraulic cylinders, the auxiliary support cylinders, the turnover hydraulic cylinders and the lifting hydraulic cylinders are all connected with an oil inlet pipeline and an oil return pipeline, a first oil pump driven by an automobile engine and a second oil pump driven by an automobile battery are connected in parallel on the oil inlet pipeline, the automobile engine and the automobile battery are respectively connected with the control unit.

Furthermore, a first reversing valve is arranged between the oil inlet pipeline and the oil return pipeline, two working oil ports of the first reversing valve are respectively connected with a first overflow valve and a second overflow valve, and oil outlets of the first overflow valve and the second overflow valve are both connected with the oil return pipeline.

Further, the first overflow valve and the second overflow valve have different overflow pressures.

Furthermore, an inclination angle sensor is installed on the telescopic arm and connected with the control unit.

Furthermore, each front hydraulic support leg comprises a front horizontal oil cylinder and a front vertical oil cylinder, each rear hydraulic support leg comprises a rear horizontal oil cylinder and a rear vertical oil cylinder, two working ports of each front horizontal oil cylinder and the rear horizontal oil cylinder are respectively connected with an oil inlet pipeline and an oil return pipeline through a second reversing valve, two working ports of each front vertical oil cylinder and the rear vertical oil cylinder are respectively connected with the oil inlet pipeline and the oil return pipeline through a third reversing valve, two working ports of each transition hydraulic oil cylinder are respectively connected with the oil inlet pipeline and the oil return pipeline through a fourth reversing valve, the auxiliary support oil cylinder is a single-action oil cylinder, a rodless cavity of the auxiliary support oil cylinder is connected with a first hydraulic control one-way valve, a working port and a control port of the first hydraulic control one-way valve are respectively connected with the oil inlet pipeline and the oil return pipeline through a fifth reversing valve, and two working ports of the turnover hydraulic oil cylinder are respectively connected with the oil inlet pipeline and the oil return pipeline through a sixth reversing valve, and two working ports of each lifting hydraulic oil cylinder are respectively connected with the oil inlet pipeline and the oil return pipeline through a seventh reversing valve.

Furthermore, the second reversing valve is an O-shaped three-position four-way electromagnetic reversing valve, the first reversing valve, the third reversing valve, the fourth reversing valve, the fifth reversing valve, the sixth reversing valve and the seventh reversing valve are all Y-shaped three-position four-way electromagnetic reversing valves, and the first reversing valve, the second reversing valve, the third reversing valve, the fourth reversing valve, the fifth reversing valve, the sixth reversing valve and the seventh reversing valve are all connected with the control unit.

Furthermore, rodless cavities of each front horizontal oil cylinder and each rear horizontal oil cylinder are connected with an oil port A of the corresponding second reversing valve, rod cavities of each front horizontal oil cylinder and each rear horizontal oil cylinder are connected with an oil port B of the corresponding second reversing valve, an oil port P of each second reversing valve is connected with an oil inlet pipeline, and an oil port T of each second reversing valve is connected with an oil return pipeline; the rodless cavities of the front vertical oil cylinder and the rear vertical oil cylinder are connected with the oil ports A of the corresponding third reversing valves, the rod cavities of the front vertical oil cylinder and the rear vertical oil cylinder are connected with the oil ports B of the corresponding third reversing valves, the oil port P of the third reversing valve is connected with an oil inlet pipeline, and the oil port T of the third reversing valve is connected with an oil return pipeline; a rodless cavity of each transition hydraulic oil cylinder is connected with an oil port A of a corresponding fourth reversing valve, a rod cavity of each transition hydraulic oil cylinder is connected with an oil port B of the corresponding fourth reversing valve, an oil port P of the fourth reversing valve is connected with an oil inlet pipeline, and an oil port T of the fourth reversing valve is connected with an oil return pipeline; the working port of the first hydraulic control one-way valve is connected with the oil port A of the fifth reversing valve, the control port of the first hydraulic control one-way valve is connected with the oil port B of the fifth reversing valve, the oil port P of the fifth reversing valve is connected with an oil inlet pipeline, and the oil port T of the fifth reversing valve is connected with an oil return pipeline; a rod cavity of the turning hydraulic oil cylinder is connected with an oil port A of the sixth reversing valve, a rodless cavity of the turning hydraulic oil cylinder is connected with an oil port B of the sixth reversing valve, an oil port P of the sixth reversing valve is connected with an oil inlet pipeline, and an oil port T of the sixth reversing valve is connected with an oil return pipeline; and a rod cavity of each lifting hydraulic oil cylinder is connected with an oil port A of the corresponding seventh reversing valve, a rodless cavity of each lifting hydraulic oil cylinder is connected with an oil port B of the corresponding seventh reversing valve, an oil port P of the seventh reversing valve is connected with an oil inlet pipeline, and an oil port T of the seventh reversing valve is connected with an oil return pipeline.

Furthermore, the rodless cavity of each of the front vertical oil cylinder and the rear vertical oil cylinder is connected with the oil port A of the corresponding third reversing valve through a second hydraulic control one-way valve, the rod cavity of each of the front vertical oil cylinder and the rear vertical oil cylinder is connected with the oil port B of the corresponding third reversing valve through a third hydraulic control one-way valve, the hydraulic control port of the second hydraulic control one-way valve is connected with the oil port B of the third reversing valve, and the hydraulic control port of the third hydraulic control one-way valve is connected with the oil port A of the third reversing valve; the rodless cavity of the transition hydraulic oil cylinder is connected with the oil port A of the fourth reversing valve through a fourth hydraulic control one-way valve, the rod cavity of the transition hydraulic oil cylinder is connected with the oil port B of the fourth reversing valve through a fifth hydraulic control one-way valve, the hydraulic control port of the fourth hydraulic control one-way valve is connected with the oil port B of the fourth reversing valve, and the hydraulic control port of the fifth hydraulic control one-way valve is connected with the oil port A of the fourth reversing valve; the rod cavity of each lifting hydraulic oil cylinder is connected with the oil port A of the corresponding seventh reversing valve through a sixth hydraulic control one-way valve, the rodless cavity of each lifting hydraulic oil cylinder is connected with the oil port B of the corresponding seventh reversing valve through a seventh hydraulic control one-way valve, the hydraulic control port of the sixth hydraulic control one-way valve is connected with the oil port B of the seventh reversing valve, and the hydraulic control port of the seventh hydraulic control one-way valve is connected with the oil port A of the seventh reversing valve.

The embodiment of the utility model has the following advantages:

(1) the first oil pump driven by the automobile engine and the second oil pump driven by the automobile battery are connected in parallel on the oil inlet pipeline, when the automobile engine works normally, the first oil pump driven by the automobile engine is used for supplying oil to the oil inlet pipeline, the second oil pump driven by the automobile battery is used as a standby oil pump, once the first oil pump is in an abnormal condition, the control unit switches the second oil pump to start working, the system pressure is ensured, a hydraulic element can continue to work normally, and the rescue work is ensured to be carried out smoothly.

(2) Because the overflow pressure of first overflow valve and second overflow valve is different, can make into oil between pipeline and the time oil return line and can switch between the pressure value of two kinds of differences, that is to say the system has two kinds of different pressures to satisfy different operating mode environment

(3) The tilt angle sensor on the telescopic arm monitors the tilt condition of the telescopic arm at any time and feeds the tilt condition back to the control unit, and the control unit controls the overturning hydraulic cylinder, the front hydraulic support leg, the rear hydraulic support leg or the transition hydraulic cylinder in the corresponding direction to compensate the tilt amount of the telescopic arm, so that the telescopic arm can be kept in a vertical state even if the load amount changes, and the rescue work is ensured to be carried out smoothly.

(4) Because the front vertical oil cylinder, the rear vertical oil cylinder, the transition hydraulic oil cylinder and the lifting hydraulic oil cylinder are all provided with two hydraulic control one-way valves, the current pressure of the hydraulic control one-way valves can be kept, the leakage of hydraulic oil caused by bearing change is avoided, and the current verticality of the telescopic boom is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a hydraulic schematic of an embodiment of the present invention;

in the figure: 1. the hydraulic control system comprises a first reversing valve, 2, a second reversing valve, 3, a third reversing valve, 4, a fourth reversing valve, 5, a fifth reversing valve, 6, a sixth reversing valve, 7, a seventh reversing valve, 8, an oil inlet pipeline, 9, an oil return pipeline, 10, a first oil pump, 11, a second oil pump, 12, a first overflow valve, 13, a second overflow valve, 14, a front horizontal oil cylinder, 15, a front vertical oil cylinder, 16, a rear horizontal oil cylinder, 17, a rear vertical oil cylinder, 18, an auxiliary supporting oil cylinder, 19, a turnover hydraulic oil cylinder, 20, a transition hydraulic oil cylinder, 21, a lifting hydraulic oil cylinder, 22, a first hydraulic control one-way valve, 23, a second hydraulic control one-way valve, 24, a third hydraulic control one-way valve, 25, a fourth hydraulic control one-way valve, 26, a fifth hydraulic control one-way valve, 27, a sixth hydraulic control one-way valve, 28 and a seventh hydraulic control one-way valve.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the utility model will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the utility model and that it is not intended to limit the utility model to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present specification, the terms "front", "rear", "left", "right" and "middle" are used for clarity of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof are also regarded as the scope of the present invention without substantial changes in the technical content.

As shown in fig. 1, the embodiment of the utility model provides a hydraulic control system of a fire truck with a climbing platform, which comprises a telescopic arm hinged and installed at the tail part of an automobile chassis, wherein a turning hydraulic cylinder 19 for turning the telescopic arm is installed on the automobile chassis, front hydraulic legs are respectively installed on the left and right of the automobile chassis close to the cab of an automobile, an auxiliary support cylinder 18 for lifting the telescopic arm is installed on the automobile chassis, rear hydraulic legs are respectively installed on the left and right of the telescopic arm far away from the cab of the automobile, transition hydraulic cylinders 20 are respectively installed on the left and right of the tail end of the automobile chassis, a plurality of lifting hydraulic cylinders 21 are installed on the telescopic arm, the front hydraulic legs, the rear hydraulic legs, the transition hydraulic cylinders 20, the auxiliary support cylinders 18, the turning hydraulic cylinder 19 and the lifting hydraulic cylinders 21 are all connected with an oil inlet pipeline 8 and an oil return pipeline 9, a first oil pump 10 driven by an automobile engine and a second oil pump 11 driven by an automobile battery are connected in parallel on the oil inlet pipeline 8, the automobile engine and the automobile battery are respectively connected with the control unit, when the automobile engine and the automobile battery normally work, the first oil pump 10 driven by the automobile engine is used for supplying oil to the oil inlet pipeline 8, the second oil pump 11 driven by the automobile battery is used as a spare, once the first oil pump 10 is in an abnormal condition, the control unit switches the second oil pump 11 to start working, the system pressure is ensured, the hydraulic elements can continue to normally work, and the rescue work is ensured to be smoothly carried out.

A first reversing valve 1 is arranged between the oil inlet pipeline 8 and the oil return pipeline 9, two working oil ports of the first reversing valve 1 are respectively connected with a first overflow valve 12 and a second overflow valve 13, and oil outlets of the first overflow valve 12 and the second overflow valve 13 are both connected with the oil return pipeline 9. The first overflow valve 12 and the second overflow valve 13 have different overflow pressures, so that the oil inlet pipeline 8 and the oil return pipeline 9 can be switched between two different pressure values, that is, the system has two different pressures to meet different working conditions.

The telescopic boom is provided with a tilt angle sensor for detecting whether the telescopic boom is inclined or not, the tilt angle sensor is connected with the control unit, once the tilt angle sensor detects that the telescopic boom is inclined, a signal is fed back to the control unit, and the control unit controls other executing elements to compensate and correct the inclination direction of the telescopic boom. During the adjustment, preferentially correct the straightness that hangs down of flexible arm through the flexible volume of adjustment distance flexible arm nearest transition hydraulic cylinder 20 and back hydraulic leg, the preceding hydraulic leg far away is as driven adjustment because of considering vehicle chassis's deflection to reach the effect of stable support, when flexible arm slope is serious, back hydraulic leg and transition hydraulic cylinder 20's regulating variable can't satisfy normal correction, then change the inclination of flexible arm through upset hydraulic cylinder 19, in order to guarantee the straightness that hangs down of flexible arm.

Each front hydraulic support leg comprises a front horizontal oil cylinder 14 and a front vertical oil cylinder 15, each rear hydraulic support leg comprises a rear horizontal oil cylinder 16 and a rear vertical oil cylinder 17, two working ports of each front horizontal oil cylinder 14 and each rear horizontal oil cylinder 16 are respectively connected with an oil inlet pipeline 8 and an oil return pipeline 9 through a second reversing valve 2, two working ports of each front vertical oil cylinder 15 and each rear vertical oil cylinder 17 are respectively connected with the oil inlet pipeline 8 and the oil return pipeline 9 through a third reversing valve 3, two working ports of each transition hydraulic oil cylinder 20 are respectively connected with the oil inlet pipeline 8 and the oil return pipeline 9 through a fourth reversing valve 4, an auxiliary support oil cylinder 18 is a single-action oil cylinder, a rodless cavity of the auxiliary support oil cylinder 18 is connected with a first hydraulic control one-way valve 22, a working port and a control port of the first hydraulic control one-way valve 22 are respectively connected with the oil inlet pipeline 8 and the oil return pipeline 9 through a fifth reversing valve 5, and two working ports of a turnover hydraulic oil cylinder 19 are respectively connected with the oil inlet pipeline 8 and the oil return pipeline 9 through a sixth reversing valve 6 Two working ports of each lifting hydraulic oil cylinder 21 are respectively connected with an oil inlet pipeline 8 and an oil return pipeline 9 through a seventh reversing valve 7.

The second reversing valve 2 is an O-shaped three-position four-way electromagnetic reversing valve, the first reversing valve 1, the third reversing valve 3, the fourth reversing valve 4, the fifth reversing valve 5, the sixth reversing valve 6 and the seventh reversing valve 7 are Y-shaped three-position four-way electromagnetic reversing valves, and the first reversing valve 1, the second reversing valve 2, the third reversing valve 3, the fourth reversing valve 4, the fifth reversing valve 5, the sixth reversing valve 6 and the seventh reversing valve 7 are all connected with the control unit.

The rodless cavities of each front horizontal oil cylinder 14 and each rear horizontal oil cylinder 16 are connected with the oil port A of the corresponding second reversing valve 2, the rod cavities of each front horizontal oil cylinder 14 and each rear horizontal oil cylinder 16 are connected with the oil port B of the corresponding second reversing valve 2, the oil port P of the second reversing valve 2 is connected with an oil inlet pipeline 8, and the oil port T of the second reversing valve 2 is connected with an oil return pipeline 9; the rodless cavities of each front vertical oil cylinder 15 and each rear vertical oil cylinder 17 are connected with the oil port A of the corresponding third reversing valve 3, the rod cavities of each front vertical oil cylinder 15 and each rear vertical oil cylinder 17 are connected with the oil port B of the corresponding third reversing valve 3, the oil port P of the third reversing valve 3 is connected with the oil inlet pipeline 8, and the oil port T of the third reversing valve 3 is connected with the oil return pipeline 9; a rodless cavity of each transition hydraulic oil cylinder 20 is connected with an oil port A of the corresponding fourth reversing valve 4, a rod cavity of each transition hydraulic oil cylinder 20 is connected with an oil port B of the corresponding fourth reversing valve 4, an oil port P of the fourth reversing valve 4 is connected with an oil inlet pipeline 8, and an oil port T of the fourth reversing valve 4 is connected with an oil return pipeline 9; a working port of the first hydraulic control one-way valve 22 is connected with an oil port A of the fifth reversing valve 5, a control port of the first hydraulic control one-way valve 22 is connected with an oil port B of the fifth reversing valve 5, an oil port P of the fifth reversing valve 5 is connected with the oil inlet pipeline 8, and an oil port T of the fifth reversing valve 5 is connected with the oil return pipeline 9; a rod cavity of the turning hydraulic oil cylinder 19 is connected with an oil port A of the sixth reversing valve 6, a rodless cavity of the turning hydraulic oil cylinder 19 is connected with an oil port B of the sixth reversing valve 6, an oil port P of the sixth reversing valve 6 is connected with an oil inlet pipeline 8, and an oil port T of the sixth reversing valve 6 is connected with an oil return pipeline 9; the rod cavity of each lifting hydraulic oil cylinder 21 is connected with the oil port A of the corresponding seventh reversing valve 7, the rodless cavity of each lifting hydraulic oil cylinder 21 is connected with the oil port B of the corresponding seventh reversing valve 7, the oil port P of the seventh reversing valve 7 is connected with the oil inlet pipeline 8, and the oil port T of the seventh reversing valve 7 is connected with the oil return pipeline 9.

The rodless cavity of each front vertical oil cylinder 15 and the rodless cavity of each rear vertical oil cylinder 17 are connected with the oil port A of the corresponding third reversing valve 3 through a second hydraulic control one-way valve 23, the rod cavity of each front vertical oil cylinder 15 and the rod cavity of each rear vertical oil cylinder 17 are connected with the oil port B of the corresponding third reversing valve 3 through a third hydraulic control one-way valve 24, the hydraulic control port of the second hydraulic control one-way valve 23 is connected with the oil port B of the third reversing valve 3, and the hydraulic control port of the third hydraulic control one-way valve 24 is connected with the oil port A of the third reversing valve 3; a rodless cavity of the transition hydraulic oil cylinder 20 is connected with an oil port A of the fourth reversing valve 4 through a fourth hydraulic control one-way valve 25, a rod cavity of the transition hydraulic oil cylinder 20 is connected with an oil port B of the fourth reversing valve 4 through a fifth hydraulic control one-way valve 26, a hydraulic control port of the fourth hydraulic control one-way valve 25 is connected with the oil port B of the fourth reversing valve 4, and a hydraulic control port of the fifth hydraulic control one-way valve 26 is connected with the oil port A of the fourth reversing valve 4; the rod cavity of each lifting hydraulic oil cylinder 21 is connected with the oil port A of the corresponding seventh reversing valve 7 through a sixth hydraulic control one-way valve 27, the rodless cavity of each lifting hydraulic oil cylinder 21 is connected with the oil port B of the corresponding seventh reversing valve 7 through a seventh hydraulic control one-way valve 28, the hydraulic control port of the sixth hydraulic control one-way valve 27 is connected with the oil port B of the seventh reversing valve 7, and the hydraulic control port of the seventh hydraulic control one-way valve 28 is connected with the oil port A of the seventh reversing valve 7.

During the use, preceding hydraulic leg, transition hydraulic cylinder 20 all stretches out and supports in ground, auxiliary support cylinder 18 lifts the non-hinged end of flexible arm, at this moment, the piston rod of upset hydraulic cylinder 19 stretches out passively under auxiliary support cylinder 18's effect, make flexible arm around the certain angle of articulated position upset back, the rodless chamber oil feed of upset hydraulic cylinder 19, its piston rod initiative is stretched out, continue the upset with flexible arm, support in vertical direction, back hydraulic leg stretches out and supports in ground, make vehicle chassis keep the level, flexible arm begins to stretch out, when inclination sensor detects flexible arm and inclines to certain direction, the hydraulic cylinder of control unit control relevant position stretches out, compensate inclination at any time, make flexible arm be in vertical state always. For example, the tilt sensor detects that the telescopic boom inclines towards the left front hydraulic leg, at this time, the control unit controls the fourth reversing valve 4 to be switched to the rodless cavity oil inlet position of the transition hydraulic cylinder 20 in the direction, the rodless cavity of the transition hydraulic cylinder 20 is filled with oil, at this time, the fifth hydraulic control one-way valve 26 is opened by hydraulic oil, the hydraulic oil in the rod cavity flows into the oil return pipeline 9 through the fifth hydraulic control one-way valve 26, the piston rod of the transition hydraulic cylinder 20 extends out, the telescopic boom is righted to a vertical state, in the adjustment process, the control unit controls the front hydraulic leg in the direction to correspondingly extend out for a certain distance, the overall level of the automobile chassis is met, the control process is the same as that of the transition hydraulic cylinder 20, and the description is omitted. When flexible arm needs the level upset, the active oil feed in pole chamber of upset hydraulic cylinder 19, the piston rod withdrawal of upset hydraulic cylinder 19, drive the reverse upset of flexible arm, when flexible arm runs into the top of auxiliary stay hydro-cylinder 18 piston rod, the control oil circuit of first liquid accuse check valve 22 is opened to oil inlet pipe way 8 hydraulic oil, first liquid accuse check valve 22 is opened, the hydraulic oil that auxiliary stay hydro-cylinder 18 does not have the pole chamber flows back oil pipe way 9 by the working port of first liquid accuse check valve 22, under the effect of flexible arm gravity, auxiliary stay hydro-cylinder 18 is supporting flexible arm slowly overturning descending, it violently collides with chassis emergence to have avoided flexible arm to fall back momentum too big, and lead to damaging flexible arm.

Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.

Claims

1. A hydraulic control system of a fire truck with a climbing platform is characterized by comprising a telescopic arm hinged and installed at the tail of a vehicle chassis, wherein a turnover hydraulic cylinder for turning the telescopic arm is installed on the vehicle chassis, front hydraulic support legs are respectively installed on the left side and the right side of the position, close to a cab of a vehicle, of the vehicle chassis, an auxiliary support cylinder for lifting the telescopic arm is installed on the vehicle chassis, rear hydraulic support legs are respectively installed on the left side and the right side of the position, far away from the cab of the vehicle, of the telescopic arm, transition hydraulic cylinders are respectively installed on the left side and the right side of the tail end position of the vehicle chassis, a plurality of lifting hydraulic cylinders are installed on the telescopic arm, the front hydraulic support legs, the rear hydraulic support legs, the transition hydraulic cylinders, the auxiliary support cylinders, the turnover hydraulic cylinders and the lifting hydraulic cylinders are all connected with an oil inlet pipeline and an oil return pipeline, a first oil pump driven by a vehicle engine and a second oil pump driven by a vehicle battery are connected in parallel on the oil inlet pipeline, the automobile engine and the automobile battery are respectively connected with the control unit.

2. The hydraulic control system of the elevating platform fire truck as recited in claim 1, wherein a first reversing valve is disposed between the oil inlet pipeline and the oil return pipeline, two working oil ports of the first reversing valve are respectively connected to a first overflow valve and a second overflow valve, and oil outlets of the first overflow valve and the second overflow valve are both connected to the oil return pipeline.

3. The hydraulic control system of a fire fighting truck with an ascending platform according to claim 2, wherein the first and second relief valves have different relief pressures.

4. The hydraulic control system of the elevating platform fire fighting truck of claim 3, wherein the telescopic boom is mounted with a tilt sensor, and the tilt sensor is connected with the control unit.

5. The hydraulic control system of the elevating platform fire truck according to claim 4, wherein each of the front hydraulic legs comprises a front horizontal cylinder and a front vertical cylinder, each of the rear hydraulic legs comprises a rear horizontal cylinder and a rear vertical cylinder, two working ports of each of the front horizontal cylinder and the rear horizontal cylinder are respectively connected with an oil inlet pipeline and an oil return pipeline through a second reversing valve, two working ports of each of the front vertical cylinder and the rear vertical cylinder are respectively connected with the oil inlet pipeline and the oil return pipeline through a third reversing valve, two working ports of each of the transition hydraulic cylinders are respectively connected with the oil inlet pipeline and the oil return pipeline through a fourth reversing valve, the auxiliary supporting cylinder is a single-acting cylinder, a rodless cavity of the auxiliary supporting cylinder is connected with a first hydraulic control one-way valve, a working port and a control port of the first hydraulic control one-way valve are respectively connected with the oil inlet pipeline and the oil return pipeline through a fifth reversing valve, and the two working ports of the turnover hydraulic oil cylinder are respectively connected with the oil inlet pipeline and the oil return pipeline through a sixth reversing valve, and the two working ports of each lifting hydraulic oil cylinder are respectively connected with the oil inlet pipeline and the oil return pipeline through a seventh reversing valve.

6. The hydraulic control system of the elevating platform fire truck as defined in claim 5, wherein the second reversing valve is an O-shaped three-position four-way electromagnetic reversing valve, the first, third, fourth, fifth, sixth and seventh reversing valves are Y-shaped three-position four-way electromagnetic reversing valves, and the first, second, third, fourth, fifth, sixth and seventh reversing valves are all connected to the control unit.

7. The hydraulic control system of the elevating platform fire fighting truck according to claim 6, wherein rodless cavities of each of the front horizontal cylinder and the rear horizontal cylinder are connected to an oil port A of the corresponding second directional control valve, rod cavities of each of the front horizontal cylinder and the rear horizontal cylinder are connected to an oil port B of the corresponding second directional control valve, an oil port P of the second directional control valve is connected to an oil inlet pipeline, and an oil port T of the second directional control valve is connected to an oil return pipeline; the rodless cavities of the front vertical oil cylinder and the rear vertical oil cylinder are connected with the oil ports A of the corresponding third reversing valves, the rod cavities of the front vertical oil cylinder and the rear vertical oil cylinder are connected with the oil ports B of the corresponding third reversing valves, the oil port P of the third reversing valve is connected with an oil inlet pipeline, and the oil port T of the third reversing valve is connected with an oil return pipeline; a rodless cavity of each transition hydraulic oil cylinder is connected with an oil port A of a corresponding fourth reversing valve, a rod cavity of each transition hydraulic oil cylinder is connected with an oil port B of the corresponding fourth reversing valve, an oil port P of the fourth reversing valve is connected with an oil inlet pipeline, and an oil port T of the fourth reversing valve is connected with an oil return pipeline; the working port of the first hydraulic control one-way valve is connected with the oil port A of the fifth reversing valve, the control port of the first hydraulic control one-way valve is connected with the oil port B of the fifth reversing valve, the oil port P of the fifth reversing valve is connected with an oil inlet pipeline, and the oil port T of the fifth reversing valve is connected with an oil return pipeline; a rod cavity of the turning hydraulic oil cylinder is connected with an oil port A of the sixth reversing valve, a rodless cavity of the turning hydraulic oil cylinder is connected with an oil port B of the sixth reversing valve, an oil port P of the sixth reversing valve is connected with an oil inlet pipeline, and an oil port T of the sixth reversing valve is connected with an oil return pipeline; and a rod cavity of each lifting hydraulic oil cylinder is connected with an oil port A of the corresponding seventh reversing valve, a rodless cavity of each lifting hydraulic oil cylinder is connected with an oil port B of the corresponding seventh reversing valve, an oil port P of the seventh reversing valve is connected with an oil inlet pipeline, and an oil port T of the seventh reversing valve is connected with an oil return pipeline.

8. The hydraulic control system of the elevating platform fire truck of claim 7, wherein the rodless cavity of each of the front vertical oil cylinder and the rear vertical oil cylinder is connected to the oil port A of the corresponding third reversing valve through a second hydraulic control one-way valve, the rod cavity of each of the front vertical oil cylinder and the rear vertical oil cylinder is connected to the oil port B of the corresponding third reversing valve through a third hydraulic control one-way valve, the hydraulic control port of the second hydraulic control one-way valve is connected to the oil port B of the third reversing valve, and the hydraulic control port of the third hydraulic control one-way valve is connected to the oil port A of the third reversing valve; the rodless cavity of the transition hydraulic oil cylinder is connected with the oil port A of the fourth reversing valve through a fourth hydraulic control one-way valve, the rod cavity of the transition hydraulic oil cylinder is connected with the oil port B of the fourth reversing valve through a fifth hydraulic control one-way valve, the hydraulic control port of the fourth hydraulic control one-way valve is connected with the oil port B of the fourth reversing valve, and the hydraulic control port of the fifth hydraulic control one-way valve is connected with the oil port A of the fourth reversing valve; the rod cavity of each lifting hydraulic oil cylinder is connected with the oil port A of the corresponding seventh reversing valve through a sixth hydraulic control one-way valve, the rodless cavity of each lifting hydraulic oil cylinder is connected with the oil port B of the corresponding seventh reversing valve through a seventh hydraulic control one-way valve, the hydraulic control port of the sixth hydraulic control one-way valve is connected with the oil port B of the seventh reversing valve, and the hydraulic control port of the seventh hydraulic control one-way valve is connected with the oil port A of the seventh reversing valve.