CN216638839U - Luffing and leveling hydraulic control system of cantilever type aerial work platform - Google Patents

Abstract

The utility model discloses a jib type aerial work platform amplitude-changing leveling hydraulic control system. The hydraulic control system comprises a variable amplitude oil cylinder and a leveling oil cylinder, and further comprises a hydraulic oil tank, and a load sensitive pump, an emergency power unit and a turntable control valve which are respectively connected with the hydraulic oil tank, wherein a gravity descending valve is installed on the variable amplitude oil cylinder, a leveling balance valve is installed on the leveling oil cylinder, and the leveling balance valve is connected with a platform control valve; the power end of the load sensitive pump is connected with a power device. The advantages are that: when the arm support becomes amplitude, the stability and the accuracy of amplitude variation and leveling are ensured. When the arm support falls in a variable amplitude manner, the problems of easy shaking, poor stability and high energy consumption in the existing scheme are solved while the stability of variable amplitude leveling is ensured, the whole body is efficient and energy-saving, the variable amplitude stability is good, the leveling precision is high, particularly, the emergency descending control is simple, the reliability is high, and when an electric control system and a power system of the whole machine fail, the arm can still fall safely under the premise of ensuring the leveling performance of a working platform.

Description

Luffing and leveling hydraulic control system of cantilever type aerial work platform

Technical Field

The utility model relates to a control system for an aerial work platform, in particular to a jib type aerial work platform amplitude-changing leveling hydraulic control system.

Background

The aerial work platform can replace traditional aerial equipment such as scaffolds, hanging baskets and the like, can improve the efficiency by 25-50%, can ensure the safety and avoid personal accidents, and can reduce the cost by 30-60%. In recent years, with the rapid development of economic science and technology in China and the attention on safe operation, aerial work platforms, especially arm-frame type aerial work platforms, are widely applied in China, for a control system of the aerial work platform, the aerial work platform with the working height less than 30 meters generally adopts double-oil-cylinder hydraulic leveling in the industry at present, the aerial work platform with the working height more than 30 meters adopts electric proportional leveling, and with the development of hydraulic and electric control technologies, the electric proportional leveling is gradually replacing the double-oil-cylinder hydraulic leveling due to the advantages of fast response, high leveling precision, no influence of flexibility of a telescopic arm and the like, and becomes a mainstream leveling scheme of newly developed arm-frame type aerial work platform products in various large host factories, however, practice proves that the oil cylinder is subjected to negative amplitude variation load when an arm frame falls, the problems of energy consumption, poor stability and the like can exist when the amplitude-variable oil cylinder is controlled by adopting a balance valve, and Chinese patent CN212222265U discloses a utility model of a gravity drop control system of an overhead working truck, which can lead the arm support to drop by dead weight and can play a certain energy-saving effect, but when the gravity-variable oil cylinder is matched with an electric proportional leveling system to work, the power source is still needed to drive the leveling oil cylinder, so the energy-saving effect is poor; when meeting inefficacy such as equipment engine, emergent power pack, controller, if adopt electric proportion leveling scheme, current emergent decline means can't keep work platform's level at the in-process that becomes width of cloth and fall, people and equipment in the work platform can have very big potential safety hazard, chinese patent CN209572272U discloses the utility model patent of the automatically controlled box of emergent decline of arm-type car, it is through set up a power relay in the power supply circuit for or put through the power of emergent decline automatically controlled box, but its electrical equipment still has the risk of inefficacy, can not follow above-mentioned problem of essence solution.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an arm-boom-type aerial work platform amplitude-variation leveling hydraulic control system which is efficient, energy-saving, good in amplitude-variation stability, high in leveling precision, simple in emergency control and high in reliability.

In order to solve the technical problem, the jib-type aerial work platform amplitude-changing leveling hydraulic control system comprises an amplitude-changing oil cylinder capable of enabling the jib to rise in amplitude and fall in amplitude, a leveling oil cylinder capable of enabling the platform to be parallel to the ground, a hydraulic oil tank, a load sensitive pump, an emergency power unit and a rotary table control valve, wherein the load sensitive pump, the emergency power unit and the rotary table control valve are respectively connected with the hydraulic oil tank; the power end of the load sensitive pump is connected with a power device, an oil outlet P1 of the load sensitive pump is connected with a port P of the rotary table control valve through a pipeline, and an LS signal port X of the load sensitive pump is connected with an LS port of the rotary table control valve through a pipeline; the oil outlet of the emergency power unit is divided into two paths, wherein one path is connected with a P1 port of the turntable control valve through a pipeline, and the other path is connected between a P2 port of the turntable control valve and a P port of a hydraulic pressure booster through a pipeline; a P3 oil port of the rotary table control valve is connected with a P port of the platform control valve through a pipeline, and a P2 oil port of the rotary table control valve is connected with a P oil port of the hydraulic pressure booster through a pipeline; the LS1 port of the rotary table control valve is connected with the LS1 port of the platform control valve through a pipeline; the T1 mouth of revolving stage control valve links to each other with the T mouth of platform control valve and the T mouth of hydraulic pressure booster respectively through the pipeline, and the T1 mouth of revolving stage control valve still links to each other through the T mouth of internal piping connection to revolving stage control valve and continues to pass through the second oil return mouth of return oil filter and hydraulic tank through the pipeline and forms total oil return route.

An oil suction port S of the load-sensitive pump is connected with a first oil outlet of the hydraulic oil tank through an oil suction filter, and a leakage oil port L of the load-sensitive pump is directly connected with a first oil return port of the hydraulic oil tank through a pipeline.

And an oil suction port of the emergency power unit is directly connected with a second oil outlet of the hydraulic oil tank through a pipeline.

And a one-number two-position two-way electromagnetic reversing valve is connected in series between the LS1 port of the rotary table control valve and the LS1 port of the platform control valve.

The platform is provided with a platform angle sensor, and the platform angle sensor can detect the included angle between the platform and the horizontal ground.

The gravity descending valve is arranged on the luffing cylinder mounting seat, a C1 oil port and a C2 oil port of the gravity descending valve are respectively communicated with the large cavity and the small cavity of the luffing cylinder, and an A1 oil port and a B1 oil port of the rotary table control valve are respectively connected with a V1 oil port and a V2 oil port of the gravity descending valve through pipelines; a PL1 oil port and a PL2 oil port of the platform control valve are respectively connected with a V1 oil port and a V2 oil port of a leveling balance valve, the leveling balance valve is installed on a leveling oil cylinder installation seat, and a C1 oil port and a C2 oil port of the leveling balance valve are respectively communicated with a large cavity and a small cavity of the leveling oil cylinder; and the P1 oil port of the platform control valve is connected with the P1 oil port of the hydraulic pressure booster.

The rotary table control valve comprises a first overflow valve, a proportional cartridge valve, a three-position four-way electromagnetic directional valve, a first flow valve, a second two-position two-way electromagnetic directional valve, a second overflow valve and a first priority valve, wherein a port P of the rotary table control valve is converged with a port P1 of the rotary table control valve after passing through a one-way valve and then divided into three paths after being converged, one path is connected with the first overflow valve, the other path is connected with an A1 oil port and a B1 oil port of the rotary table control valve through the proportional cartridge valve and the three-position four-way electromagnetic directional valve, the other path is connected with a port P3 of the rotary table control valve through the second flow valve and the second two-way electromagnetic directional valve, an oil return port of the three-position four-way electromagnetic directional valve is connected with the first priority valve, and the other oil outlet of the first priority valve is connected with a port T; an LS1 port oil path of the rotary table control valve is connected to a spring cavity above the first priority valve after passing through a damping hole, and meanwhile, an LS1 oil path of the rotary table control valve is also connected with a main oil return path through a second overflow valve; the load pressure signal behind proportional cartridge valve and the No. two-way solenoid directional valves is connected to the LS mouth through inside oil duct, and the LS oil circuit of revolving stage control valve still links to each other with the oil return way through a flow valve.

The hydraulic pressure booster includes the pressure cylinder, two tee bend switching-over valves of liquid accuse, the liquid accuse check valve, wherein connect the P1 mouth of hydraulic pressure booster through the liquid accuse check valve all the way in the P mouth of hydraulic pressure booster, connect the most right side pocket of pressure cylinder through No. two check valves all the way in addition, still be connected to two tee bend switching-over valve oil inlets of liquid accuse all the way, LP piston both ends oil pocket is connected with two oil-outs of two tee bend switching-over valves of liquid accuse respectively on the pressure cylinder, the most right side pocket of pressure cylinder is connected the P1 mouth of hydraulic pressure booster through No. three check valves, the big chamber in the most left side of pressure cylinder is connected with hydraulic pressure booster's T mouth.

The gravity descending valve comprises a three-position two-way electromagnetic reversing valve, a three-overflow valve, a three-flow valve, a two-position two-way proportional reversing valve, a first pressure compensation valve, a first flexible shaft and a second flexible shaft, one path of a V1 oil port of the gravity descending valve passes through a four-position one-way valve and the three-position two-way electromagnetic reversing valve and then is connected with a C1 oil port of the gravity descending valve, and the other path of the V1 oil port of the gravity descending valve passes through the three-overflow valve and the three-flow valve and is connected to a V2 oil port of the gravity descending valve; the pipeline between the three-position two-way electromagnetic reversing valve and the four-position two-way proportional reversing valve is also connected to a V2 oil port of the gravity drop valve through a pressure compensation valve and a two-position two-way proportional reversing valve, and the first flexible shaft and the second flexible shaft are respectively connected with a manual control module of the three-position two-way electromagnetic reversing valve and a manual control module of the two-position two-way proportional reversing valve.

The platform control valve comprises a second priority valve, a second pressure compensation valve, a three-position four-way proportional reversing valve, a shuttle valve, an energy accumulator, a third flexible shaft and a fourth flexible shaft; the P oil port of the platform control valve passes through a fifth check valve and the P1 oil port of the platform control valve and then passes through a sixth check valve to be converged, one path of the P oil port is connected to the T port of the platform control valve through a second priority valve, and the other path of the P oil port is connected to the PL1 oil port and the PL2 oil port of the platform control valve through a second pressure compensation valve and a three-position four-way proportional reversing valve; the return oil of the three-position four-way proportional reversing valve is directly connected to a T port of the platform control valve through a seven-position one-way valve, a PL1 oil port and a PL2 oil port of the platform control valve are connected with an LS1 oil port and an energy accumulator after being compared through a shuttle valve, and a third flexible shaft and a fourth flexible shaft are respectively connected with two manual control modules of the three-position four-way proportional reversing valve.

The utility model has the advantages that:

(1) when the arm support becomes amplitude, pressure oil of the amplitude-changing oil cylinder and the leveling oil cylinder is provided by the load sensitive pump, the amplitude of the arm support is controlled proportionally, and the controller receives signals of the platform angle sensor and then controls the leveling oil cylinder proportionally, so that the platform is leveled quickly and accurately.

(2) When the arm support falls in a variable amplitude manner, the three-position two-way electromagnetic directional valve and the two-position two-way proportional directional valve in the gravity descending valve are controlled to be electrified, so that the arm support can descend in a self-weight proportion manner; at the moment, the two-position two-way electromagnetic reversing valve is controlled to be powered off, the one-position two-way electromagnetic reversing valve is powered on, the oil return of the large cavity of the amplitude-variable oil cylinder is preferentially led to the hydraulic pressure booster, the hydraulic pressure booster boosts the oil return of the large cavity of the amplitude-variable oil cylinder and then provides an oil source for the leveling oil cylinder, and the controller controls the proportional valve to achieve proportional leveling when the platform falls along with the amplitude-variable arm support.

(3) The emergency power unit is mainly used for emergency operation of other actions such as rotary table rotation, arm support retraction and the like, in the amplitude-variable leveling hydraulic control system, when a hydraulic pressure booster breaks down, an emergency descending mode can be started, and the emergency power unit is adopted to independently provide power for the leveling oil cylinder; when an equipment engine, an emergency power unit, a controller and the like fail, a rotary table operator can control the arm support to change amplitude and fall through a first flexible shaft and a second flexible shaft, return oil of a large cavity of an amplitude-changing oil cylinder preferentially enters a hydraulic pressure booster through a priority valve in a rotary table control valve, and then enters a platform control valve after being pressurized, and platform personnel can realize manual leveling of the platform by controlling a third flexible shaft and a fourth flexible shaft, so that the problem that the platform cannot be leveled during emergency descending in the existing scheme is solved, and the safety of the arm support type aerial work platform is greatly improved.

(4) The automatic arm-falling device has the advantages of high efficiency, energy conservation, good amplitude-changing stability, high leveling precision, simple emergency descending control and high reliability, and can still safely fall the arm on the premise of ensuring the leveling performance of the working platform when an electric control system and a power system of the whole machine fail.

Drawings

FIG. 1 is a schematic view of the structure of the boom type aerial work platform of the present invention;

FIG. 2 is a schematic diagram of a hydraulic system of the luffing leveling hydraulic control system of the boom type aerial work platform of the present invention;

FIG. 3 is an overall working schematic diagram of the amplitude-variable leveling of the arm support in the utility model;

FIG. 4 is a schematic diagram of a turntable control valve of the present invention;

FIG. 5 is a schematic diagram of a hydraulic intensifier of the present invention;

FIG. 6 is a schematic diagram of the gravity drop valve of the present invention;

FIG. 7 is a schematic diagram of a platform control valve according to the present invention;

FIG. 8 is a control schematic diagram of the boom type aerial work platform variable amplitude leveling hydraulic control system of the present invention;

FIG. 9 is a schematic diagram of a load sensitive pump according to the present invention;

in the figure:

1-getting-on working mechanism, 2-hydraulic oil tank, 3-oil absorption filter, 4-power device (engine or motor), 5-load sensitive pump, 6-emergency power unit, 7-rotary table control valve, 8-oil return filter, 9-one two-position two-way electromagnetic directional valve, 10-hydraulic pressure booster, 11-gravity drop valve, 12-amplitude variable oil cylinder, 13-platform control valve, 14-leveling oil cylinder balance valve, 15-leveling oil cylinder;

101-frame turntable, 102-first connecting rod, 103-second connecting rod, 104-arm support, 105-forearm, 106-platform and 107-platform angle sensor;

701-a first overflow valve, 702-a proportional cartridge valve, 703-a three-position four-way electromagnetic directional valve, 704-a first flow valve, 705-a second flow valve, 706-a second two-position two-way electromagnetic directional valve, 707-a second overflow valve and 708-a first priority valve; 709-one-way valve;

1001-pressure cylinder, 1002-hydraulic control two-position three-way reversing valve, 1003-hydraulic control one-way valve, 1004-second one-way valve and 1005-third one-way valve;

1101-a third two-position two-way electromagnetic directional valve, 1102-a third overflow valve, 1103-a third flow valve, 1104-a two-position two-way proportional directional valve, 1105-a first pressure compensation valve, 1106-a first flexible shaft, 1107-a second flexible shaft and 1108-a fourth one-way valve;

1301-second priority valve, 1302-second pressure compensation valve, 1303-three-position four-way proportional reversing valve, 1304-shuttle valve, 1305-fourth flow valve, 1306-accumulator, 1306-third flexible shaft, 1307-fourth flexible shaft, 1309-fifth check valve, 1310-sixth check valve and 1311-seventh check valve;

17-operating means, 18-controller, 19-engine or motor speed controller.

Detailed Description

The embodiment focuses on the amplitude variation starting, amplitude variation falling and emergency descending of the cantilever type aerial work platform by combining the attached drawings. The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.

The utility model relates to an arm-type aerial work platform, which comprises an upper vehicle working mechanism, a variable amplitude leveling hydraulic system, a control system and the like, wherein the control system comprises a controller, an operating device, a platform angle sensor, an engine or motor rotating speed controller, a one-number two-position two-way electromagnetic directional valve, a rotary table control valve, a gravity descent valve, a relevant electromagnetic valve in the platform control valve and the like.

As shown in fig. 1-3, the boarding work mechanism 1 mentioned in the present invention includes a frame turntable 101, a first connecting rod 102, a second connecting rod 103, an arm support 104, a small arm 105, a platform 106, a luffing cylinder 12, and a leveling cylinder 15, wherein the first connecting rod 102 and the second connecting rod 103 are respectively hinged to the frame turntable 101 through points E and G, the arm support 104 is respectively hinged to the first connecting rod 102 and the second connecting rod 103 through points F and H, a cylinder barrel of the luffing cylinder 12 is hinged to the second connecting rod 103 through point a, and a cylinder rod of the luffing cylinder 12 is hinged to the arm support 104 through point B, so that luffing lifting and luffing falling of the arm support 104 can be realized by telescoping of the luffing cylinder 12; a cylinder barrel of the leveling oil cylinder 15 is hinged with the arm support 104 through a point C, a cylinder rod of the leveling oil cylinder 15 is hinged with the small arm 105 through a point D, and therefore the platform can be kept parallel to the ground through the stretching of the leveling oil cylinder 15; a platform angle sensor 107 is mounted on the platform 106 for detecting the angle of the platform 106 with the horizontal ground and transmitting a signal to the controller 18.

As shown in fig. 1-3, the boom-type aerial work platform luffing leveling hydraulic control system of the utility model comprises a hydraulic oil tank 2, an oil suction filter 3, a power device (engine or motor) 4, a load-sensitive pump 5, an emergency power unit 6, a turntable control valve 7, an oil return filter 8, a first two-position two-way electromagnetic directional valve 9, a hydraulic pressure booster 10, a gravity descending valve 11, a platform control valve 13, and a leveling oil cylinder balance valve 14; the hydraulic oil tank 2 is provided with two oil outlets and two oil return ports which are respectively a first oil outlet, a first oil return port, a second oil outlet and a second oil return port from left to right; the load sensitive pump 5, the turntable control valve 7, the hydraulic pressure booster 10, the gravity descending valve 11 and the platform control valve 13 are all of an integral structure; wherein, the load-sensitive pump 5 is connected with the output end of the engine or the motor 4 through a transmission shaft to obtain source power; an oil suction port S of the load-sensitive pump 5 is connected with a first oil outlet of the hydraulic oil tank 2 through the oil suction filter 3, a leakage oil port L of the load-sensitive pump is directly connected with a first oil return port of the hydraulic oil tank 2 through a hydraulic hose, an oil outlet P1 of the load-sensitive pump is connected with a port P of the rotary table control valve 7 through a high-pressure hose, and an LS signal port X of the load-sensitive pump 5 is connected with an LS port of the rotary table control valve 7 through a high-pressure hose; an oil suction port of the emergency power unit 6 is directly connected with a second oil outlet of the hydraulic oil tank 2 through a hydraulic hose, one path of the oil outlet is connected with P1 of the turntable control valve 7 through a high-pressure hose, and the other path of the oil outlet is connected with a high-pressure hose between P2 of the turntable control valve 7 and a P port of the hydraulic supercharger 10 through a high-pressure hose and a pipe joint; the P3 oil port is connected with the P port of the platform control valve 13 through a high-pressure hose, and the P2 oil port is connected with the P oil port of the hydraulic pressure booster 10 through the high-pressure hose; an LS1 port of the rotary table control valve 7 is connected with an LS1 port of the platform control valve 13 through a high-pressure hose, and a first two-position two-way electromagnetic reversing valve 9 is connected in series in the middle; a T1 port of the rotary table control valve 7 is connected with a T port of the platform control valve 13 and a T port of the hydraulic supercharger 10 through a high-pressure hose and a pipe joint, and is connected with the T port through an internal oil passage, and then is connected with a second oil return port of the hydraulic oil tank 2 through a high-pressure hose and an oil return filter 8 to form total oil return of the hydraulic system; an A1 oil port of the rotary table control valve 7 is connected with a V1 oil port of the gravity descending valve 11 through a high-pressure hose, a B1 oil port of the rotary table control valve 7 is connected with a V2 oil port of the gravity descending valve 11 through a high-pressure hose, the gravity descending valve 11 is installed on a mounting seat of the amplitude-variable oil cylinder 12 through a bolt, and a C1 oil port of the gravity descending valve 11 is communicated with a large cavity of the amplitude-variable oil cylinder 12; the C2 oil port of the gravity descending valve 11 is communicated with the small cavity of the amplitude variation oil cylinder 12; the PL1 oil port of the platform control valve 13 is connected with the V1 oil port of the leveling balance valve 14 through a high-pressure hose, the PL2 oil port of the platform control valve 13 is connected with the V2 oil port of the leveling balance valve 14 through a high-pressure hose, the leveling balance valve 14 is installed on a mounting seat of the leveling oil cylinder 15 through a bolt, the C1 oil port of the leveling balance valve 14 is communicated with a large cavity of the leveling oil cylinder 15, the C2 oil port of the leveling balance valve 14 is communicated with a small cavity of the leveling oil cylinder 15, and the P1 oil port of the platform control valve 13 is connected with the P1 oil port of the hydraulic pressure booster 10.

Further, the turntable control valve 7 is an integral valve block and comprises a first overflow valve 701, a proportional cartridge valve 702, a three-position four-way electromagnetic directional valve 703, a first flow valve 704, a second flow valve 705, a second two-position two-way electromagnetic directional valve 706, a second overflow valve 707, a first priority valve 708, a plurality of damping holes and a check valve (such as a check valve 709), a port P of the turntable control valve 7 passes through the first check valve 709 and then is merged with a port P1 of the turntable control valve 7 and then is divided into three paths, one path is connected with the first overflow valve 701, the other path is connected with ports a1 and B1 of the turntable control valve 7 through the proportional cartridge valve 702 and the three-position four-way electromagnetic directional valve 703, the other path is connected with the port P3 of the turntable control valve 7 through the second flow valve 705 and the two-position two-way electromagnetic directional valve 706, an oil return port of the three-position four-way electromagnetic directional valve 703 is connected with the first priority valve 708, oil from an LS1 port of the rotary table control valve 7 passes through a damping hole and then acts on a spring cavity above the first priority valve 708, the first priority valve 708 can preferentially supply oil to a P2 oil port, and the other oil outlet of the first priority valve 708 is connected with a T port; meanwhile, an LS1 oil path of the rotary table control valve 7 is also connected with a main oil return path through a second overflow valve 707, an LS signal is sent to an LS port according to a load pressure signal behind the proportional cartridge valve 702 and a second two-position two-way electromagnetic reversing valve 706, and the LS oil path of the rotary table control valve is also connected with the oil return path through a first flow valve 704.

Still further, the hydraulic pressure booster 10 is of an integral structure and comprises a pressure cylinder 1001, a hydraulic control two-position three-way reversing valve 1002, a hydraulic control one-way valve 1003 and two one-way valve accessories (a second one-way valve 1004 and a third one-way valve 1005), one path of a P port of the hydraulic pressure booster 10 is connected with a P1 port of the hydraulic pressure booster 10 through the hydraulic control one-way valve 1003, the second path of the P port is connected with a rightmost small cavity of the pressure cylinder 1001 through the second one-way valve 1004, the third path of the P port is connected with an oil inlet of the hydraulic control two-position three-way reversing valve 1002, oil cavities at two ends of an LP piston on the pressure cylinder 1001 are respectively connected with two oil outlets of the hydraulic control two-position three-way reversing valve 1002, the rightmost small cavity of the pressure cylinder 1001 is connected with a P1 port of the hydraulic pressure booster 10 through the third one-way valve 1005, and the leftmost large cavity of the pressure cylinder 1001 is connected with the T port of the hydraulic pressure booster 10. When oil enters from the port P, the hydraulic control one-way valve 1003 is automatically closed due to pressure balance, hydraulic oil reaches the right end of the piston HP through the three-way one-way valve 1005, the piston LP of the pressure cylinder is pushed to move to the leftmost part in the left direction, after the piston HP of the pressure cylinder reaches the leftmost end, the high-pressure oil is communicated with a spring cavity at the right end of the valve core of the hydraulic control two-position three-way reversing valve 1002, the valve core is pushed to move leftwards, after reversing, the hydraulic oil reaches the left end of the piston LP through the hydraulic control two-position three-way reversing valve 1002, the piston HP is pushed to move rightwards, and high-pressure oil is output; after the piston HP of the pressure cylinder 1001 reaches the rightmost end, the spring cavity at the right end of the valve core of the hydraulic control two-position three-way reversing valve 1002 is connected with the port T, the hydraulic control two-position three-way reversing valve 1002 reverses again and returns to the initial position shown in the figure, and the hydraulic pressure booster 10 can continuously output high-pressure oil through the port P1 in automatic circulation.

Further, the gravity descending valve 11 is an integral valve block, and includes a three-number two-position two-way electromagnetic directional valve 1101, a three-number overflow valve 1102, a three-number flow valve 1103, a two-position two-way proportional directional valve 1104, a first pressure compensation valve 1105, a first flexible shaft 1106 and a second flexible shaft 1107. One path of a V1 oil port of the gravity descending valve 11 passes through a fourth check valve 1108 and a third two-position two-way electromagnetic directional valve 1101 and then is connected with a C1 oil port of the gravity descending valve 11, and the other path of a V1 oil port of the gravity descending valve 11 is connected with a V2 oil port of the gravity descending valve 11 through a third overflow valve 1102 and a third flow valve 1103; an oil duct pipeline between the third two-position two-way electromagnetic directional valve 1101 and the fourth one-way valve 1108 is further connected to a V2 oil port of the gravity descent valve 11 through a first pressure compensation valve 1105 and a two-position two-way proportional directional valve 1104, the first flexible shaft 1106 and the second flexible shaft 1107 are respectively connected with a manual control module of the third two-position two-way electromagnetic directional valve 1101 and the two-position two-way proportional directional valve 1104, and meanwhile, a flexible shaft handle is fixed at a position on the frame convenient to operate.

Further, the platform control valve 13 is an integral valve block, which comprises a second priority valve 1301, a second pressure compensation valve 1302, a three-position four-way proportional reversing valve 1303, a shuttle valve 1304, a fourth flow valve 1305, an energy accumulator 1306, a third flexible shaft 1307 and a fourth flexible shaft 1308; the P oil port of the platform control valve 13 passes through a fifth check valve 1309 and the P1 oil port of the platform control valve 13 and then is converged after passing through a sixth check valve 1310, one path of the P oil port is connected to the T port of the platform control valve 13 through a second priority valve 1301, and the other path of the P oil port is connected to the PL1 oil port and the PL2 oil port of the platform control valve 13 through a second pressure compensation valve 1302 and a three-position four-way proportional reversing valve 1303; the return oil of the three-position four-way proportional reversing valve 1303 is directly connected to a T port of the platform control valve 13 through a seven-position one-way valve 1311, a PL1 oil port and a PL2 oil port of the platform control valve 13 are compared through the shuttle valve 1304 and then connected with an LS1 oil port of the platform control valve 13 and an energy accumulator 1306, pressure of the PL1 and PL2 oil ports of the platform control valve 13 after comparison through the shuttle valve 1304 is obtained through LS signals and sent to an LS1 oil port and the energy accumulator 1306, the pressure also acts on a second priority valve 1301 and a second pressure compensation valve 1301 control cavity, and an LS oil path is also connected with the return oil path through a fourth flow valve 1305; the third flexible shaft 1307 and the fourth flexible shaft 1308 are respectively connected with two manual control modules of the three-position four-way proportional reversing valve 1303, and meanwhile, a flexible shaft handle is fixed at a position above the working platform 106, which is convenient to operate.

Still further, said operating device 17 can output at least enable signal, accelerator pedal signal, amplitude rising signal, amplitude falling signal and emergency arm falling signal; the controller 18 at least comprises two switching value input ports and four analog value input ports; the enabling signal and the emergency arm falling signal of the operating device 17 are electrically connected with the switching value input end of the controller 18; an accelerator pedal signal, a variable amplitude starting signal, a variable amplitude falling signal and a platform angle sensor 107 of the operating device 17 are electrically connected with an analog input end of the controller 18; the output end of the controller 18 is electrically connected with each electromagnetic valve electric control module, the rotating speed controller 19 of the engine or the motor and the emergency power unit 6.

The working principle is as follows:

when the operating device 17 does not output, all the electromagnetic valves are not powered, the states of the valves are as shown in fig. 1, 4, 6 and 7, and the amplitude cylinder 12 and the leveling cylinder 15 are respectively kept locked by the gravity descending valve 11 and the leveling cylinder balance valve 14; the engine 4 is in an idling state, the load sensitive pump 5 is unloaded at low pressure and small flow, and if the motor 4 is used as a power source of the whole machine, the motor 4 is not started.

As shown in fig. 1, 4, 6, 7 and 8, when the operation device 17 outputs an enable signal plus a variable amplitude signal, the controller 18 controls the rotation speed of the engine or motor 4 through the engine or motor rotation speed controller 19 according to the input of the accelerator pedal signal; the proportional electromagnet E1 of the proportional cartridge valve 702 is powered proportionally according to the output of the operating device 17, the switch electromagnet E2 of the three-position four-way electromagnetic directional valve 703 is powered, and the valve core is switched to the right position; the switch electromagnet E4 of the first two-way electromagnetic directional valve 9 is not electrified, so that the LS signals from the platform control valve 13 to the first priority valve 708 are cut off, the load sensitive pump 5 automatically adjusts the swash plate of the load sensitive pump according to the LS signals returned by the LS port of the rotary table control valve 7, pressure oil with proper flow is output to the P port of the rotary table control valve 7, and the pressure oil enters the large cavity of the amplitude-variable oil cylinder 12 and the P port of the platform control valve 13 according to the electrified state of the electromagnetic valve; meanwhile, the controller 18 receives and calculates signals of the platform angle sensor 107, outputs signals to control the proportional electromagnets E5 and E6 of the three-position four-way proportional reversing valve 1303 to be opened or closed in proportion, and LS signals of the platform control valve 13 act on the second priority valve 1301 to block direct oil return of pressure oil, so that the pressure oil enters the leveling oil cylinder 15 to finish automatic leveling of the platform 106 in the amplitude-variable lifting process of the arm support 104; in the process, the rapidity of the leveling response of the platform 106 is ensured by using the second priority valve 1301 and the energy accumulator 1306, the leveling stability of the platform 106 is ensured by using the second pressure compensation valve 1302, at the moment, the return oil of the leveling oil cylinder 15 passes through an oil passage in the platform control valve 13 to the port T of the platform control valve, then is connected to the port T1 of the rotary table control valve 7 through a high-pressure hose, and the return oil of the small cavity of the luffing oil cylinder 12 passes through the first priority valve 708 and is also directly connected with an oil return passage, so that the total return oil of the hydraulic system is formed.

When the operation device 17 outputs an enable signal and a variable amplitude drop signal, the engine 4 is in an idling state at the moment, the load sensitive pump 5 is unloaded at a low pressure and a small flow, and if the whole machine adopts the motor 4 as a power source, the motor 4 is not started. As shown in fig. 4, at this time, the relevant electromagnetic valves of the turntable control valve 7 are not powered, the three-position four-way electromagnetic directional valve 703 is in the middle position, and the two-position two-way electromagnetic directional valve 706 is in the left position. As shown in fig. 1 and 6, at this time, the controller 18 also controls the switch electromagnet E4 of the first two-position two-way electromagnetic directional valve 9 to be electrified, the switch electromagnet E8 of the third two-position two-way electromagnetic directional valve 1101 in the gravity descent valve 11 to be electrified, the proportional electromagnet E7 of the two-position two-way proportional directional valve 1104 outputs a variable amplitude drop signal to be electrified in proportion according to the operating device 17, and the proportional control on the variable amplitude drop of the boom 104 is completed, where the use of the first pressure compensation valve 1101 ensures the stability of the variable amplitude drop of the boom 104, and meanwhile, the controller 18 receives and calculates the signal of the platform angle sensor 107, outputs the signal to control the proportional electromagnets E5 and E6 of the three-position four-way proportional directional valve 1303 to be opened or closed in proportion, and the LS signal of the platform control valve 13 acts on the second priority valve 1301 to block the pressure oil from directly entering the leveling oil cylinder 15; according to the power-on state of the electromagnetic valve, the LS signal of the platform control valve 13 also acts on the spring cavity above the first priority valve 1301, so that the large cavity return oil of the luffing cylinder 12 can preferentially enter one path of the hydraulic pressure booster 10 through the first priority valve 708 in the rotary table control valve 7, and then enters the P oil port of the platform control valve 13 after being boosted, and pressure oil enters the leveling cylinder 15 through the control of the three-position four-way proportional reversing valve 1303, and the automatic leveling of the platform 106 in the luffing falling process of the arm support 104 is completed. At this time, the return oil of the leveling cylinder 15 passes through the internal oil passage of the platform control valve 1 to the port T thereof, and then is connected to the port T1 of the turntable control valve 7 through a high-pressure hose, the small-cavity return oil of the luffing cylinder 12 is shunted by the first priority valve 708, and the oil which does not enter the hydraulic pressure booster 10 is also connected with the return oil passage, so as to form the total return oil of the hydraulic system.

Emergency descent is classified into the following two categories:

the first case is light, considering that in a luffing leveling hydraulic control system, the hydraulic booster 10 may fail. At this time, an emergency arm falling signal can be output through the operation device 17, as shown in fig. 1, 4, 6 and 7, the controller 18 controls the switch electromagnet E3 of the two-position two-way electromagnetic directional valve 706 to be electrified, the switch electromagnet E8 of the three-position two-way electromagnetic directional valve 1101 in the gravity drop valve 11 to be electrified, and the proportional electromagnet E7 of the two-position two-way proportional directional valve 1104 is electrified in proportion to the amplitude falling signal output by the operation device 17, so that proportional control of the amplitude falling of the boom 104 is completed. At this time, the controller 18 also controls the emergency power unit 6 to start, pressure oil is separately provided for the platform control valve 13 through the second two-position two-way electromagnetic directional valve 706, like the two embodiments, the controller 18 receives and calculates signals of the platform angle sensor 107, outputs signals to control the proportional electromagnets E5 and E6 of the three-position four-way proportional directional valve 1303 to be opened or closed in proportion, the LS signal of the platform control valve 13 acts on the second priority valve 1301 to block direct oil return of the pressure oil, so that the pressure oil enters the leveling cylinder 15, and automatic leveling of the platform 106 in the amplitude and drop process of the boom 104 is completed.

The second emergency descent condition is more severe, the extreme condition being considered, i.e. the condition in which the whole engine or motor 4, the emergency power unit 6 and the controller 18 are all out of order. As shown in fig. 1, 6, and 7, at this time, the operator of the turntable needs to manually open the first two-position two-way electromagnetic directional valve 9 to communicate the LS port of the platform control valve 13 with the spring cavity above the first priority valve 708, and then control the third two-position two-way electromagnetic directional valve 1101 through the first flexible shaft 1106 to be in the left position; the second flexible shaft 1107 controls the two-position two-way proportional reversing valve 1104 to be positioned at an upper position, so that the amplitude-variable oil cylinder 13 can be controlled to retract by means of the self weight of the arm support 104, and the amplitude-variable falling action of the arm support 104 is completed;

the large-cavity return oil of the variable-amplitude oil cylinder 12 preferentially enters the hydraulic pressure booster 10 all the way through the first priority valve 708 in the rotary table control valve 7, and then enters the platform control valve 13 after being boosted, and platform personnel adjust the left and right openings of the three-position four-way proportional reversing valve 1303 in the platform control valve 13 by controlling the third flexible shaft 1306 and the fourth flexible shaft 1307, so that the pressure oil enters the leveling oil cylinder 15, and manual leveling of the platform 106 in the variable-amplitude falling process along with the arm support 104 is realized.

On the basis of adopting a load sensitive pump and an emergency power unit to provide power for a hydraulic system, a proportional cartridge valve is matched with an electromagnetic directional valve to control the amplitude of variation, and an electric proportional valve control platform is automatically leveled; the electric control system is matched with the gravity descending valve to control the proportional descending of the variable amplitude cylinder, the oil returned by the gravity descending valve preferentially passes through the hydraulic pressure booster, and pressure oil is provided for the action of the leveling cylinder through the platform control valve after the oil is pressurized, so that an oil source is provided for the leveling cylinder after the oil returned by the large cavity of the variable amplitude cylinder is pressurized by the hydraulic pressure booster; the electric proportional leveling of the platform when the arm support falls is realized; two operators respectively operate the flexible shafts arranged on the rotary table and the platform, so that emergency descending can be realized when an equipment engine, an emergency power unit, a controller and the like fail.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.

Claims (10)

1. The utility model provides a jib formula aerial working platform becomes width of cloth leveling hydraulic control system, includes can make jib (104) become width of cloth and become width of cloth hydro-cylinder (12) that fall with changing width of cloth and can make platform (106) keep with the leveling cylinder (15) that ground is parallel which characterized in that: the hydraulic variable-amplitude oil cylinder is characterized by further comprising a hydraulic oil tank (2), and a load sensitive pump (5), an emergency power unit (6) and a rotary table control valve (7) which are respectively connected with the hydraulic oil tank (2), wherein a gravity descending valve (11) is installed on the variable-amplitude oil cylinder (12), a leveling balance valve (14) is installed on the leveling oil cylinder (15), and the leveling balance valve (14) is connected with a platform control valve (13); the power end of the load sensitive pump (5) is connected with a power device (4), an oil outlet P1 of the load sensitive pump (5) is connected with a port P of the rotary table control valve (7) through a pipeline, and an LS signal port X of the load sensitive pump (5) is connected with an LS port of the rotary table control valve (7) through a pipeline; the oil outlet of the emergency power unit (6) is divided into two paths, wherein one path is connected with the P1 of the rotary table control valve (7) through a pipeline, and the other path is connected between the P2 port of the rotary table control valve (7) and the P port of a hydraulic pressure booster (10) through a pipeline; a P2 oil port of the rotary table control valve (7) is connected with a P oil port of the hydraulic pressure booster (10) through a pipeline, and a P3 oil port of the rotary table control valve (7) is connected with a P oil port of the platform control valve (13) through a pipeline; the LS1 port of the rotary table control valve (7) is connected with the LS1 port of the platform control valve (13) through a pipeline; the T1 mouth of revolving stage control valve (7) links to each other with the T mouth of platform control valve (13) and the T mouth of hydraulic pressure booster (10) respectively through the pipeline, the T1 mouth of revolving stage control valve (7) still is connected to the T mouth of revolving stage control valve (7) through inside pipeline and continues to link to each other through the second oil return mouth of pipeline process oil return filter (8) and hydraulic tank (2) and form total oil return route.

2. The jib type aerial work platform amplitude-changing leveling hydraulic control system according to claim 1, which is characterized in that: an oil suction port S of the load-sensitive pump (5) is connected with a first oil outlet of the hydraulic oil tank (2) through the oil suction filter (3), and a leakage oil port L of the load-sensitive pump (5) is directly connected with a first oil return port of the hydraulic oil tank (2) through a pipeline.

3. The jib type aerial work platform amplitude-changing leveling hydraulic control system according to claim 1 or 2, which is characterized in that: and an oil suction port of the emergency power unit (6) is directly connected with a second oil outlet of the hydraulic oil tank (2) through a pipeline.

4. The jib type aerial work platform amplitude-changing leveling hydraulic control system according to claim 3, wherein: a one-number two-position two-way electromagnetic reversing valve (9) is connected in series between an LS1 port of the rotary table control valve (7) and an LS1 port of the platform control valve (13).

5. The jib-type aerial work platform amplitude-variation leveling hydraulic control system according to claim 1, 2 or 4, which is characterized in that: install platform angle sensor (107) on platform (106), through platform angle sensor (107) can detect the contained angle of platform (106) and level ground.

6. The jib type aerial work platform amplitude-changing leveling hydraulic control system according to claim 5, characterized in that: the gravity descending valve (11) is installed on a mounting seat of the variable amplitude oil cylinder (12), a C1 oil port and a C2 oil port of the gravity descending valve (11) are respectively communicated with a large cavity and a small cavity of the variable amplitude oil cylinder (12), and an A1 oil port and a B1 oil port of the rotary table control valve (7) are respectively connected with a V1 oil port and a V2 oil port of the gravity descending valve (11) through pipelines; a PL1 oil port and a PL2 oil port of the platform control valve (13) are respectively connected with a V1 oil port and a V2 oil port of a leveling balance valve (14), the leveling balance valve (14) is installed on a mounting seat of a leveling oil cylinder (15), and a C1 oil port and a C2 oil port of the leveling balance valve (14) are respectively communicated with a large cavity and a small cavity of the leveling oil cylinder (15); and a P1 oil port of the platform control valve (13) is connected with a P1 oil port of the hydraulic pressure booster (10).

7. The jib type aerial work platform amplitude-changing leveling hydraulic control system according to claim 1, 2, 4 or 6, which is characterized in that: the rotary table control valve (7) comprises a first overflow valve (701), a proportional cartridge valve (702), a three-position four-way electromagnetic directional valve (703), a first flow valve (704), a second flow valve (705), a second two-position two-way electromagnetic directional valve (706), a second overflow valve (707) and a first priority valve (708), a P port of the rotary table control valve (7) is converged with a P1 port of the rotary table control valve (7) through a first check valve (709) and then divided into three paths after convergence, one path is connected with the first overflow valve (701), the other path is connected with an A1 oil port and a B1 oil port of the rotary table control valve (7) through the proportional cartridge valve (702) and the three-position four-way electromagnetic directional valve (703), the other path is connected with a P3 port of the rotary table control valve (7) through the second flow valve (705) and the second two-position two-way electromagnetic directional valve (706), and an oil return port of the three-position four-way electromagnetic directional valve (703) is connected with the first priority valve (708), the other oil outlet of the first priority valve (708) is connected with a T port; an LS1 port oil path of the rotary table control valve (7) is connected to a spring cavity above the first priority valve (708) after passing through a damping hole, and an LS1 oil path of the rotary table control valve (7) is also connected with a main oil return path through a second overflow valve (707); and load pressure signals behind the proportional cartridge valve (702) and the second two-position two-way electromagnetic directional valve (706) are connected to an LS port through an internal oil passage, and an LS oil passage of the rotary table control valve (7) is also connected with an oil return passage through a first flow valve (704).

8. The jib type aerial work platform amplitude-changing leveling hydraulic control system according to claim 7, which is characterized in that: the hydraulic pressure booster (10) comprises a pressure boosting cylinder (1001), a hydraulic control two-position three-way reversing valve (1002) and a hydraulic control one-way valve (1003), one of P ports of the hydraulic pressure booster (10) is connected with a P1 port of the hydraulic pressure booster (10) through the hydraulic control one-way valve (1003), the other P port of the hydraulic pressure booster (10) is connected with a rightmost small cavity of the pressure boosting cylinder (1001) through a second one-way valve (1004), the other P port of the hydraulic pressure booster (1001) is connected with an oil inlet of the hydraulic control two-position three-way reversing valve (1002), oil cavities at two ends of an LP piston on the pressure boosting cylinder (1001) are respectively connected with two oil outlets of the hydraulic control two-position three-way reversing valve (1002), the rightmost small cavity of the pressure boosting cylinder (1001) is connected with a P1 port of the hydraulic pressure booster (10) through a third one-way valve (1005), and the leftmost large cavity of the pressure boosting cylinder (1001) is connected with a T port of the hydraulic pressure booster (10).

9. The jib type aerial work platform amplitude-changing leveling hydraulic control system according to claim 1, 2, 4, 6 or 8, which is characterized in that: the gravity descending valve (11) comprises a three-number two-position two-way electromagnetic reversing valve (1101), a three-number overflow valve (1102), a three-number flow valve (1103), a two-position two-way proportional reversing valve (1104), a first pressure compensation valve (1105), a first flexible shaft (1106) and a second flexible shaft (1107), one path of a V1 oil port of the gravity descending valve (11) passes through a four-number one-way valve (1108) and a three-number two-way electromagnetic reversing valve (1101) and then is connected with a C1 oil port of the gravity descending valve (11), and the other path of a V1 oil port of the gravity descending valve (11) is connected with a V2 oil port of the gravity descending valve (11) through the three-number overflow valve (1102) and the three-number flow valve (1103); the pipeline between the third two-position two-way electromagnetic directional valve (1101) and the fourth one-way valve (1108) is further connected to a V2 oil port of the gravity descent valve (11) through a first pressure compensation valve (1105) and a two-position two-way proportional directional valve (1104), and a first flexible shaft (1106) and a second flexible shaft (1107) are respectively connected with a manual control module of the third two-position two-way electromagnetic directional valve (1101) and the two-position two-way proportional directional valve (1104).

10. The jib-type aerial work platform amplitude-variation leveling hydraulic control system according to claim 9, wherein: the platform control valve (13) comprises a second priority valve (1301), a second pressure compensation valve (1302), a three-position four-way proportional reversing valve (1303), a shuttle valve (1304), an energy accumulator (1306), a third flexible shaft (1307) and a fourth flexible shaft (1308); a P oil port of the platform control valve (13) passes through a fifth check valve (1309) and a P1 oil port of the platform control valve (13) and then passes through a sixth check valve (1310) to be converged, one path of the P oil port is connected to a T port of the platform control valve (13) through a second priority valve (1301), and the other path of the P oil port is connected to a PL1 oil port and a PL2 oil port of the platform control valve (13) through a second pressure compensation valve (1302) and a three-position four-way proportional reversing valve (1303); the oil return of the three-position four-way proportional reversing valve (1303) is directly connected to a T port of the platform control valve (13) through a seven-position one-way valve (1311), a PL1 oil port and a PL2 oil port of the platform control valve (13) are compared through a shuttle valve (1304) and then connected with an LS1 oil port and an energy accumulator (1306) of the platform control valve (13), and a third flexible shaft (1307) and a fourth flexible shaft (1308) are respectively connected with two manual control modules of the three-position four-way proportional reversing valve (1303).

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