Outrigger leveling hydraulic system and aerial lift

Abstract

The application discloses a outrigger leveling hydraulic system and an aerial work platform. The outrigger leveling hydraulic system comprises a first electromagnetic reversing valve, a shunt and collector unit, and an oil cylinder unit, wherein the oil cylinder unit comprises a first oil cylinder, a second oil cylinder, a third oil cylinder and a fourth oil cylinder, the rodless cavity of the first oil cylinder and the rodless cavity of the second oil cylinder are communicated with the first shunt oil port of the first shunt and collector valve, the rod cavity of the first oil cylinder is communicated with the first shunt oil port of the second shunt and collector valve, the rod cavity of the second oil cylinder is communicated with the second shunt oil port of the second shunt and collector valve, the rodless cavity of the third oil cylinder and the rodless cavity of the fourth oil cylinder are communicated with the second shunt oil port of the first shunt and collector valve, the rod cavity of the third oil cylinder is communicated with the first shunt oil port of the third shunt and collector valve, and the rod cavity of the fourth oil cylinder is communicated with the second shunt oil port of the third shunt and collector valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aerial work, and particularly relates to a supporting leg leveling hydraulic system and an aerial work vehicle. BACKGROUND

[0002] In the technical field of aerial work, the leveling of the supporting legs of a conventional aerial work vehicle is usually manually hydraulic leveling. When manually leveling the supporting legs of the aerial work vehicle, if all the supporting legs are to be synchronized, the damping needs to be frequently adjusted, which is not only time-consuming and laborious, but also results in very poor leveling effect of the supporting legs due to processing errors, telescopic lengths and weather factors of the supporting legs. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art. To this end, the present application provides a supporting leg leveling hydraulic system, which can improve the leveling effect of the supporting legs.

[0004] The present application also provides an aerial work vehicle with the above supporting leg leveling hydraulic system.

[0005] The outrigger leveling hydraulic system according to the first aspect of the present application comprises: a first electromagnetic reversing valve, a first oil port of the first electromagnetic reversing valve being configured to communicate with a hydraulic pump, a second oil port of the first electromagnetic reversing valve being configured to communicate with an oil tank, in a case where the first electromagnetic reversing valve is in a first state, the first oil port of the first electromagnetic reversing valve communicates with a third oil port of the first electromagnetic reversing valve, and a fourth oil port of the first electromagnetic reversing valve communicates with the second oil port of the first electromagnetic reversing valve, in a case where the first electromagnetic reversing valve is in a second state, the first oil port of the first electromagnetic reversing valve communicates with a fourth oil port of the first electromagnetic reversing valve, and the third oil port of the first electromagnetic reversing valve communicates with the second oil port of the first electromagnetic reversing valve; a shunt and collecting unit, the shunt and collecting unit comprising a first shunt and collecting valve, a second shunt and collecting valve, and a third shunt and collecting valve, a collecting oil port of the first shunt and collecting valve communicating with the third oil port of the first electromagnetic reversing valve, and a collecting oil port of the second shunt and collecting valve and a collecting oil port of the third shunt and collecting valve both communicating with the fourth oil port of the first electromagnetic reversing valve; and a cylinder unit, the cylinder unit comprising a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, a rodless chamber of the first cylinder and a rodless chamber of the second cylinder both communicating with a first shunt oil port of the first shunt and collecting valve, a rod chamber of the first cylinder communicating with a first shunt oil port of the second shunt and collecting valve, a rod chamber of the second cylinder communicating with a second shunt oil port of the second shunt and collecting valve, a rodless chamber of the third cylinder and a rodless chamber of the fourth cylinder both communicating with a second shunt oil port of the first shunt and collecting valve, a rod chamber of the third cylinder communicating with a first shunt oil port of the third shunt and collecting valve, and a rod chamber of the fourth cylinder communicating with a second shunt oil port of the third shunt and collecting valve.

[0006] The outrigger leveling hydraulic system according to the present application has at least the following beneficial effects:

[0007] In the above outrigger leveling hydraulic system, the first oil port of the first electromagnetic reversing valve is used for communication with the hydraulic pump, the second oil port of the first electromagnetic reversing valve is used for communication with the oil tank, the collecting oil port of the first shunt collecting valve is in communication with the third oil port of the first electromagnetic reversing valve, and the collecting oil port of the second shunt collecting valve and the collecting oil port of the second shunt collecting valve are both in communication with the fourth oil port of the first electromagnetic reversing valve. In this way, when it is needed to extend the first cylinder, the second cylinder, the third cylinder and the fourth cylinder of the cylinder unit, the first electromagnetic reversing valve can be switched to the first state, then the hydraulic oil in the hydraulic pump can enter the collecting oil port of the first shunt collecting valve through the first oil port of the first electromagnetic reversing valve and the third oil port of the first electromagnetic reversing valve in turn, and then enter the rodless cavity of the first cylinder and the rodless cavity of the second cylinder through the first shunt oil port of the first shunt collecting valve, and enter the rodless cavity of the third cylinder and the rodless cavity of the fourth cylinder through the second shunt oil port of the first shunt collecting valve at the same time; the hydraulic oil in the rod cavity of the first cylinder and the hydraulic oil in the rod cavity of the second cylinder can enter the second shunt collecting valve through the first shunt oil port of the second shunt collecting valve and the second shunt oil port of the second shunt collecting valve respectively, and the hydraulic oil in the rod cavity of the third cylinder and the hydraulic oil in the rod cavity of the fourth cylinder can enter the third shunt collecting valve through the first shunt oil port of the third shunt collecting valve and the second shunt oil port of the third shunt collecting valve respectively, and the hydraulic oil in the second shunt collecting valve and the hydraulic oil in the third shunt collecting valve can flow to the fourth oil port of the first electromagnetic reversing valve through the collecting oil port of the second shunt collecting valve and the collecting oil port of the third shunt collecting valve respectively, and finally enter the oil tank through the second oil port of the first electromagnetic reversing valve which is in communication with the fourth oil port of the first electromagnetic reversing valve. Thus, the purpose of extending the first cylinder, the second cylinder, the third cylinder and the fourth cylinder is achieved.

[0008] During the process of extending the first cylinder, the second cylinder, the third cylinder and the fourth cylinder, the first shunt oil port of the first shunt collecting valve and the second shunt oil port of the first shunt collecting valve can ensure that the oil inlet amounts of the rodless cavities of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are the same, and the first shunt oil port of the second shunt collecting valve, the second shunt oil port of the second shunt collecting valve, the first shunt oil port of the third shunt collecting valve and the second shunt oil port of the third shunt collecting valve can ensure that the oil outlet amounts of the rod cavities of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are the same, so as to ensure that the first cylinder, the second cylinder, the third cylinder and the fourth cylinder have the same extension length during the extension process, so as to make the outrigger connected with the first cylinder, the second cylinder, the third cylinder and the fourth cylinder have better leveling effect when extending.

[0009] When the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder of the oil cylinder unit need to be retracted, the first electromagnetic directional valve can be switched to the second state, and then the hydraulic oil in the hydraulic pump can enter the collecting oil port of the second shunt collecting valve and the collecting oil port of the third shunt collecting valve through the first oil port of the first electromagnetic directional valve and the fourth oil port of the first electromagnetic directional valve respectively, and then enter the rod cavity of the first oil cylinder and the rod cavity of the second oil cylinder through the first shunt oil port of the second shunt collecting valve and the second shunt oil port of the second shunt collecting valve respectively, and simultaneously enter the rod cavity of the third oil cylinder and the rod cavity of the fourth oil cylinder through the first shunt oil port of the third shunt collecting valve and the second shunt oil port of the third shunt collecting valve respectively; the hydraulic oil in the rodless cavity of the first oil cylinder and the hydraulic oil in the rodless cavity of the second oil cylinder can enter the first shunt oil port of the first shunt collecting valve, the hydraulic oil in the rodless cavity of the third oil cylinder and the hydraulic oil in the rodless cavity of the fourth oil cylinder can enter the second shunt oil port of the first shunt collecting valve, and further, the hydraulic oil entering the first shunt oil port of the first shunt collecting valve and the hydraulic oil entering the second shunt oil port of the first shunt collecting valve can enter the third oil port of the first electromagnetic directional valve through the collecting oil port of the first shunt collecting valve, and finally enter the oil tank through the second oil port of the first electromagnetic directional valve communicating with the third oil port of the first electromagnetic directional valve. Thus, the purpose of retracting the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder is achieved.

[0010] During the retraction of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder, the first shunt oil port of the second shunt collecting valve, the second shunt oil port of the second shunt collecting valve, the first shunt oil port of the third shunt collecting valve and the second shunt oil port of the third shunt collecting valve can ensure that the oil inlet amounts of the rod cavities of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder are the same, and the first shunt oil port of the first shunt collecting valve and the second shunt oil port of the first shunt collecting valve can ensure that the oil outlet amounts of the rodless cavities of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder are the same, so that the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder can have the same retraction length during the retraction, so that the outrigger connected with the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder has better leveling effect during the retraction.

[0011] According to some embodiments of the present application, the first oil cylinder is a first horizontal oil cylinder, the second oil cylinder is a second horizontal oil cylinder, the third oil cylinder is a third horizontal oil cylinder, and the fourth oil cylinder is a fourth horizontal oil cylinder.

[0012] According to some embodiments of the present application, the oil cylinder unit further comprises a first vertical oil cylinder, a second vertical oil cylinder, a third vertical oil cylinder and a fourth vertical oil cylinder, the rodless cavity of the first vertical oil cylinder and the rodless cavity of the second vertical oil cylinder are in communication with the first shunt oil port of the first shunt valve, the rod cavity of the first vertical oil cylinder is in communication with the first shunt oil port of the second shunt valve, the rod cavity of the second vertical oil cylinder is in communication with the second shunt oil port of the second shunt valve, the rodless cavity of the third vertical oil cylinder and the rodless cavity of the fourth oil are in communication with the second shunt oil port of the first shunt valve, the rod cavity of the third vertical oil cylinder is in communication with the first shunt oil port of the third shunt valve, and the rod cavity of the fourth vertical oil cylinder is in communication with the second shunt oil port of the third shunt valve.

[0013] According to some embodiments of the present application, the outrigger leveling hydraulic system further comprises a second electromagnetic directional valve and a third electromagnetic directional valve, the first oil port of the second electromagnetic directional valve is in communication with the first shunt oil port of the first shunt valve, the rodless cavity of the first horizontal oil cylinder and the rodless cavity of the second horizontal oil cylinder are in communication with the second oil port of the second electromagnetic directional valve, and the rodless cavity of the first vertical oil cylinder and the rodless cavity of the second vertical oil cylinder are in communication with the third oil port of the second electromagnetic directional valve;

[0014] the first oil port of the third electromagnetic directional valve is in communication with the second shunt oil port of the first shunt valve, the rodless cavity of the third horizontal oil cylinder and the rodless cavity of the fourth horizontal oil cylinder are in communication with the second oil port of the third electromagnetic directional valve, and the rodless cavity of the third vertical oil cylinder and the rodless cavity of the fourth vertical oil cylinder are in communication with the third oil port of the third electromagnetic directional valve.

[0015] According to some embodiments of the present application, the outrigger leveling hydraulic system further comprises a first hydraulic control check valve, the first oil port of the first hydraulic control check valve is in communication with the second oil port of the second electromagnetic directional valve, the rodless cavity of the first horizontal oil cylinder and the rodless cavity of the second horizontal oil cylinder are in communication with the second oil port of the first hydraulic control check valve, and the control oil port of the first hydraulic control check valve is in communication with the first shunt oil port of the second shunt valve.

[0016] According to some embodiments of the present application, the outrigger leveling hydraulic system further comprises a first damping pipeline, one end of the first damping pipeline is in communication with the first shunt oil port of the second shunt valve, and the other end of the first damping pipeline is in communication with the second shunt oil port of the second shunt valve;

[0017] Wherein, the first damping pipeline is provided with a first damping hole.

[0018] According to some embodiments of the present application, the outrigger leveling hydraulic system further comprises a second hydraulic control check valve, a first oil port of the second hydraulic control check valve being in communication with a second oil port of the third electromagnetic reversing valve, a rodless cavity of the third horizontal oil cylinder and a rodless cavity of the fourth horizontal oil cylinder both being in communication with a second oil port of the second hydraulic control check valve, and a control oil port of the second hydraulic control check valve being in communication with a first shunt oil port of the third shunt and collecting valve.

[0019] According to some embodiments of the present application, the outrigger leveling hydraulic system further comprises a second damping pipeline, one end of the second damping pipeline being in communication with the first shunt oil port of the third shunt and collecting valve, and the other end of the second damping pipeline being in communication with a second shunt oil port of the third shunt and collecting valve.

[0020] Wherein, a second damping hole is arranged on the second damping pipeline.

[0021] According to some embodiments of the present application, the outrigger leveling hydraulic system further comprises a third damping pipeline, one end of the third damping pipeline being in communication with the first shunt oil port of the first shunt and collecting valve, and the other end of the third damping pipeline being in communication with the second shunt oil port of the first shunt and collecting valve.

[0022] Wherein, a third damping hole is arranged on the third damping pipeline.

[0023] The aerial work platform according to the second aspect of the embodiments of the present application comprises the outrigger leveling hydraulic system as described above.

[0024] The aerial work platform according to the embodiments of the present application has at least the following beneficial effects:

[0025] In the aerial work platform described above, since the outrigger leveling hydraulic system described above connected with the outrigger of the aerial work platform can improve the leveling effect of the outrigger, the aerial work platform described above has better stability during lifting or lowering, thereby further improving the safety of the aerial work platform described above. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0027] Figure 1 FIG. 1 is a structural schematic diagram of an outrigger leveling hydraulic system according to an embodiment of the present application;

[0028] Figure 2 FIG. 2 is a structural schematic diagram of the outrigger leveling hydraulic system according to the embodiment of the present application when the first electromagnetic reversing valve is in the first state;

[0029] Figure 3Structure schematic view of the outrigger leveling hydraulic system of one embodiment of the present application when the first electromagnetic reversing valve is in the second state.

[0030] Reference signs:

[0031] 100, first electromagnetic reversing valve;

[0032] 210, hydraulic pump; 220, oil tank;

[0033] 310, first shunt collector valve; 320, second shunt collector valve; 330, third shunt collector valve;

[0034] 410, first horizontal oil cylinder; 420, first horizontal oil cylinder; 430, third horizontal oil cylinder 430; 440, fourth horizontal oil cylinder 440;

[0035] 510, first vertical oil cylinder; 520, second vertical oil cylinder; 530, third vertical oil cylinder; 540, fourth vertical oil cylinder;

[0036] 610, second electromagnetic reversing valve; 620, third electromagnetic reversing valve;

[0037] 710, first hydraulic control check valve; 720, second hydraulic control check valve;

[0038] 810, first pipeline; 820, second pipeline; 830, third pipeline; 840, fourth pipeline; 850, fifth pipeline; 860, sixth pipeline;

[0039] 910, first damping pipeline; 911, first damping hole; 920, second damping pipeline; 921, second damping hole; 930, third damping pipeline; 931, third damping hole. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below with reference to examples thereof shown in the attached drawings, wherein the same or similar reference numerals represent the same or similar elements throughout the drawings. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and are not to be understood as limiting the present application.

[0041] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc., is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] In the description of the present application, more refers to more than two. If the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implying the number of indicated technical features or implying the sequence of indicated technical features.

[0043] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0044] Referring to Figure 1 And Figure 3 As shown in the figure, the outrigger leveling hydraulic system of one embodiment of the present application comprises a first electromagnetic reversing valve 100, a shunt and collector unit, and a cylinder unit.

[0045] Specifically, the first oil port a of the first electromagnetic reversing valve 100 is used for communication with the hydraulic pump 210, the second oil port b of the first electromagnetic reversing valve 100 is used for communication with the oil tank 220, in the case that the first electromagnetic reversing valve 100 is in the first state, the first oil port a of the first electromagnetic reversing valve 100 is in communication with the third oil port c of the first electromagnetic reversing valve 100, and the fourth oil port d of the first electromagnetic reversing valve 100 is in communication with the second oil port b of the first electromagnetic reversing valve 100, in the case that the first electromagnetic reversing valve 100 is in the second state, the first oil port a of the first electromagnetic reversing valve 100 is in communication with the fourth oil port d of the first electromagnetic reversing valve 100, and the third oil port c of the first electromagnetic reversing valve 100 is in communication with the second oil port b of the first electromagnetic reversing valve 100; the shunt and collector unit comprises a first shunt and collector valve 310, a second shunt and collector valve 320, and a third shunt and collector valve 330, the collector oil port e of the first shunt and collector valve 310 is in communication with the third oil port c of the first electromagnetic reversing valve 100, and the collector oil port h of the second shunt and collector valve 320 and the collector oil port k of the third shunt and collector valve 330 are both in communication with the fourth oil port d of the first electromagnetic reversing valve 100; the cylinder unit comprises a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, the rodless cavity of the first cylinder and the rodless cavity of the second cylinder are both in communication with the first shunt oil port f of the first shunt and collector valve 310, the rod cavity of the first cylinder is in communication with the first shunt oil port i of the second shunt and collector valve 320, the rod cavity of the second cylinder is in communication with the second shunt oil port j of the second shunt and collector valve 320, the rodless cavity of the third cylinder and the rodless cavity of the fourth cylinder are both in communication with the second shunt oil port g of the first shunt and collector valve 310, the rod cavity of the third cylinder is in communication with the first shunt oil port m of the third shunt and collector valve 330, and the rod cavity of the fourth cylinder is in communication with the second shunt oil port n of the third shunt and collector valve 330.

[0046] It should be noted that, as Figure 2The first electromagnetic directional valve 100 shown is in a first state, as Figure 3 The first electromagnetic directional valve 100 shown is in a second state.

[0047] In the outrigger leveling hydraulic system described above, the first oil port a of the first electromagnetic directional valve 100 is used to communicate with the hydraulic pump 210, the second oil port b of the first electromagnetic directional valve 100 is used to communicate with the oil tank 220, the collecting oil port e of the first shunt and collecting valve 310 communicates with the third oil port c of the first electromagnetic directional valve 100, and the collecting oil port h of the second shunt and collecting valve 320 and the collecting oil port h of the second shunt and collecting valve 320 both communicate with the fourth oil port d of the first electromagnetic directional valve 100. In this way, when it is necessary to extend the first, second, third, and fourth cylinders of the cylinder unit, the first electromagnetic directional valve 100 can be switched to the first state, and then the hydraulic oil in the hydraulic pump 210 can enter the collecting oil port e of the first shunt and collecting valve 310 in turn through the first oil port a of the first electromagnetic directional valve 100 and the third oil port c of the first electromagnetic directional valve 100, and then enter the rodless cavity of the first cylinder and the rodless cavity of the second cylinder through the first shunt oil port f of the first shunt and collecting valve 310, and simultaneously enter the rodless cavity of the third cylinder and the rodless cavity of the fourth cylinder through the second shunt oil port g of the first shunt and collecting valve 310; the hydraulic oil in the rod cavity of the first cylinder and the hydraulic oil in the rod cavity of the second cylinder can enter the second shunt and collecting valve 320 through the first shunt oil port i of the second shunt and collecting valve 320 and the second shunt oil port j of the second shunt and collecting valve 320, respectively, and the hydraulic oil in the rod cavity of the third cylinder and the hydraulic oil in the rod cavity of the fourth cylinder can enter the third shunt and collecting valve 330 through the first shunt oil port m of the third shunt and collecting valve 330 and the second shunt oil port n of the third shunt and collecting valve 330, respectively, and the hydraulic oil in the second shunt and collecting valve 320 and the hydraulic oil in the third shunt and collecting valve 330 can flow to the fourth oil port d of the first electromagnetic directional valve 100 through the collecting oil port h of the second shunt and collecting valve 320 and the collecting oil port k of the third shunt and collecting valve 330, respectively, and finally enter the oil tank 220 through the second oil port b of the first electromagnetic directional valve 100 that communicates with the fourth oil port d of the first electromagnetic directional valve 100. Thus, the purpose of extending the first, second, third, and fourth cylinders is achieved.

[0048] In the process of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder stretching out, the first shunt port f of the first shunt valve 310 and the second shunt port g of the first shunt valve 310 can ensure that the oil inlet amounts of the rodless chambers of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder are the same, and the first shunt port i of the second shunt valve 320, the second shunt port j of the second shunt valve 320, the first shunt port m of the third shunt valve 330 and the second shunt port n of the third shunt valve 330 can ensure that the oil outlet amounts of the rod chambers of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder are the same, so as to ensure that the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder have the same stretching length in the process of stretching out, so as to make the outrigger connected with the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder have better leveling effect when stretching out.

[0049] When it is needed to make the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder of the oil cylinder unit contract, the first electromagnetic reversing valve 100 can be switched to the second state, then the hydraulic oil in the hydraulic pump 210 can enter into the collecting port h of the second shunt valve 320 and the collecting port k of the third shunt valve 330 through the first oil port a of the first electromagnetic reversing valve 100 and the fourth oil port d of the first electromagnetic reversing valve 100 respectively, and then enter into the rod chambers of the first oil cylinder and the second oil cylinder through the first shunt port i and the second shunt port j of the second shunt valve 320 respectively, and enter into the rod chambers of the third oil cylinder and the fourth oil cylinder through the first shunt port m and the second shunt port n of the third shunt valve 330 respectively; the hydraulic oil in the rodless chamber of the first oil cylinder and the hydraulic oil in the rodless chamber of the second oil cylinder can enter into the first shunt port f of the first shunt valve 310, and the hydraulic oil in the rodless chamber of the third oil cylinder and the hydraulic oil in the rodless chamber of the fourth oil cylinder can enter into the second shunt port g of the first shunt valve 310, and further, the hydraulic oil entering into the first shunt port f of the first shunt valve 310 and the hydraulic oil entering into the second shunt port g of the first shunt valve 310 can enter into the third oil port c of the first electromagnetic reversing valve 100 through the collecting port e of the first shunt valve 310, and finally enter into the oil tank 220 through the second oil port b of the first electromagnetic reversing valve 100 communicating with the third oil port c of the first electromagnetic reversing valve 100. Thus, the purpose of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder contracting is achieved.

[0050] In the process of the contraction of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder, the first shunt port i of the second shunt and collecting valve 320, the second shunt port j of the second shunt and collecting valve 320, the first shunt port m of the third shunt and collecting valve 330 and the second shunt port n of the third shunt and collecting valve 330 can ensure that the oil inlet amounts of the rod cavities of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder are the same, and the first shunt port f of the first shunt and collecting valve 310 and the second shunt port g of the first shunt and collecting valve 310 can ensure that the oil outlet amounts of the rodless cavities of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder are the same, so as to ensure that the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder have the same contraction length in the contraction process, so as to make the outrigger connected with the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder have better leveling effect when contracting.

[0051] With reference to Figure 1 It can be understood that the first oil cylinder is the first horizontal oil cylinder 410, the second oil cylinder is the second horizontal oil cylinder 420, the third oil cylinder is the third horizontal oil cylinder 430, and the fourth oil cylinder is the fourth horizontal oil cylinder 440.

[0052] When the first horizontal oil cylinder 410, the second horizontal oil cylinder 420, the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440 need to be retracted, the first electromagnetic reversing valve 100 can be switched to the second state, and the hydraulic oil in the hydraulic pump 210 can enter the tank 220 through the first oil port a of the first electromagnetic reversing valve 100 and the second oil port b of the first electromagnetic reversing valve 100 in sequence. The hydraulic oil in the rodless cavity of the first horizontal oil cylinder 410 and the rodless cavity of the second horizontal oil cylinder 420 can enter the tank 220 through the first oil port a of the first electromagnetic reversing valve 100 and the second oil port b of the first electromagnetic reversing valve 100, and the hydraulic oil in the rodless cavity of the third horizontal oil cylinder 430 and the rodless cavity of the fourth horizontal oil cylinder 440 can enter the tank 220 through the first oil port a of the first electromagnetic reversing valve 100 and the second oil port b of the first electromagnetic reversing valve 100. The hydraulic oil in the rod cavity of the first horizontal oil cylinder 410 and the rod cavity of the second horizontal oil cylinder 420 can enter the tank 220 through the second oil port b of the first electromagnetic reversing valve 100 and the first oil port a of the first electromagnetic reversing valve 100, and the hydraulic oil in the rod cavity of the third horizontal oil cylinder 430 and the rod cavity of the fourth horizontal oil cylinder 440 can enter the tank 220 through the second oil port b of the first electromagnetic reversing valve 100 and the first oil port a of the first electromagnetic reversing valve 100. Thus, the purpose of retracting the first horizontal oil cylinder 410, the second horizontal oil cylinder 420, the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440 is achieved.

[0053] When it is required to retract the first horizontal oil cylinder 410, the second horizontal oil cylinder 420, the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440, the first electromagnetic directional valve 100 can be switched to the second state, then the hydraulic oil in the hydraulic pump 210 can enter into the collecting oil port h of the second distribution and collecting valve 320 and the collecting oil port k of the third distribution and collecting valve 330 through the second oil port b of the first electromagnetic directional valve 100 and the fourth oil port d of the first electromagnetic directional valve 100 respectively, and then enter into the rod cavity of the first horizontal oil cylinder 410 and the rod cavity of the second horizontal oil cylinder 420 through the first distribution oil port i of the second distribution and collecting valve 320 and the second distribution oil port j of the second distribution and collecting valve 320 respectively, and simultaneously enter into the rod cavity of the third horizontal oil cylinder 430 and the rod cavity of the fourth horizontal oil cylinder 440 through the first distribution oil port m of the third distribution and collecting valve 330 and the second distribution oil port n of the third distribution and collecting valve 330 respectively; the hydraulic oil in the rodless cavity of the first horizontal oil cylinder 410 and the hydraulic oil in the rodless cavity of the second horizontal oil cylinder 420 can enter into the first distribution oil port f of the first distribution and collecting valve 310, the hydraulic oil in the rodless cavity of the third horizontal oil cylinder 430 and the hydraulic oil in the rodless cavity of the fourth horizontal oil cylinder 440 can enter into the second distribution oil port g of the first distribution and collecting valve 310, and further, the hydraulic oil entering into the first distribution oil port f of the first distribution and collecting valve 310 and the hydraulic oil entering into the second distribution oil port g of the first distribution and collecting valve 310 can enter into the third oil port c of the first electromagnetic directional valve 100 through the collecting oil port e of the first distribution and collecting valve 310, and finally enter into the oil tank 220 through the second oil port b of the first electromagnetic directional valve 100 communicating with the third oil port c of the first electromagnetic directional valve 100. Thus the purpose of retracting the first horizontal oil cylinder 410, the second horizontal oil cylinder 420, the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440 is achieved.

[0054] Referring to Figure 1 It can be understood that the oil cylinder unit further comprises a first vertical oil cylinder 510, a second vertical oil cylinder 520, a third vertical oil cylinder 530 and a fourth vertical oil cylinder 540, the rodless cavity of the first vertical oil cylinder 510 and the rodless cavity of the second vertical oil cylinder 520 are in communication with the first distribution oil port f of the first distribution and collecting valve 310, the rod cavity of the first vertical oil cylinder 510 is in communication with the first distribution oil port i of the second distribution and collecting valve 320, the rod cavity of the second vertical oil cylinder 520 is in communication with the second distribution oil port j of the second distribution and collecting valve 320, the rodless cavity of the third vertical oil cylinder 530 and the rodless cavity of the fourth vertical oil cylinder 540 are in communication with the second distribution oil port g of the first distribution and collecting valve 310, the rod cavity of the third vertical oil cylinder 530 is in communication with the first distribution oil port m of the third distribution and collecting valve 330, and the rod cavity of the fourth vertical oil cylinder 540 is in communication with the second distribution oil port n of the third distribution and collecting valve 330.

[0055] When the first vertical oil cylinder 510, the second vertical oil cylinder 520, the third vertical oil cylinder 530 and the fourth vertical oil cylinder 540 need to be extended, the first electromagnetic reversing valve 100 can be switched to the first state, then the hydraulic oil in the hydraulic pump 210 can enter into the collecting oil port e of the first distribution and collecting valve 310 through the first oil port a of the first electromagnetic reversing valve 100 and the third oil port c of the first electromagnetic reversing valve 100 in turn, and then enter into the rodless cavity of the first vertical oil cylinder 510 and the rodless cavity of the second vertical oil cylinder 520 through the first distribution oil port f of the first distribution and collecting valve 310, and enter into the rodless cavity of the third vertical oil cylinder 530 and the rodless cavity of the fourth vertical oil cylinder 540 through the second distribution oil port g of the first distribution and collecting valve 310; the hydraulic oil in the rod cavity of the first vertical oil cylinder 510 and the hydraulic oil in the rod cavity of the second vertical oil cylinder 520 can enter into the second distribution and collecting valve 320 through the first distribution oil port i of the second distribution and collecting valve 320 and the second distribution oil port j of the second distribution and collecting valve 320 respectively, and the hydraulic oil in the rod cavity of the third vertical oil cylinder 530 and the hydraulic oil in the rod cavity of the fourth vertical oil cylinder 540 can enter into the third distribution and collecting valve 330 through the first distribution oil port m of the third distribution and collecting valve 330 and the second distribution oil port n of the third distribution and collecting valve 330 respectively, the hydraulic oil in the second distribution and collecting valve 320 and the hydraulic oil in the third distribution and collecting valve 330 can flow into the fourth oil port d of the first electromagnetic reversing valve 100 through the collecting oil port h of the second distribution and collecting valve 320 and the collecting oil port k of the third distribution and collecting valve 330 respectively, and finally enter into the oil tank 220 through the second oil port b of the first electromagnetic reversing valve 100 which communicates with the fourth oil port d of the first electromagnetic reversing valve 100. Thus, the extension of the first vertical oil cylinder 510, the second vertical oil cylinder 520, the third vertical oil cylinder 530 and the fourth vertical oil cylinder 540 is realized.

[0056] When it is needed to retract the first vertical oil cylinder 510, the second vertical oil cylinder 520, the third vertical oil cylinder 530 and the fourth vertical oil cylinder 540, the first electromagnetic reversing valve 100 can be switched to the second state, then the hydraulic oil in the hydraulic pump 210 can enter into the collecting oil port h of the second distribution and collecting valve 320 and the collecting oil port k of the third distribution and collecting valve 330 in sequence through the second oil port b of the first electromagnetic reversing valve 100 and the fourth oil port d of the first electromagnetic reversing valve 100 respectively, and then enter into the rod cavity of the first vertical oil cylinder 510 and the second vertical oil cylinder 520 through the first distribution oil port i of the second distribution and collecting valve 320 and the second distribution oil port j of the second distribution and collecting valve 320 respectively, and simultaneously enter into the rod cavity of the third vertical oil cylinder 530 and the fourth vertical oil cylinder 540 through the first distribution oil port m of the third distribution and collecting valve 330 and the second distribution oil port n of the third distribution and collecting valve 330 respectively; the hydraulic oil in the rodless cavity of the first vertical oil cylinder 510 and the hydraulic oil in the rodless cavity of the second vertical oil cylinder 520 can enter into the first distribution oil port f of the first distribution and collecting valve 310, the hydraulic oil in the rodless cavity of the third vertical oil cylinder 530 and the hydraulic oil in the rodless cavity of the fourth vertical oil cylinder 540 can enter into the second distribution oil port g of the first distribution and collecting valve 310, further, the hydraulic oil entering into the first distribution oil port f of the first distribution and collecting valve 310 and the hydraulic oil entering into the second distribution oil port g of the first distribution and collecting valve 310 can enter into the third oil port c of the first electromagnetic reversing valve 100 through the collecting oil port e of the first distribution and collecting valve 310, and finally enter into the oil tank 220 through the second oil port b of the first electromagnetic reversing valve 100 communicating with the third oil port c of the first electromagnetic reversing valve 100. Thus the purpose of retracting the first vertical oil cylinder 510, the second vertical oil cylinder 520, the third vertical oil cylinder 530 and the fourth vertical oil cylinder 540 is achieved.

[0057] With reference to Figure 1 It can be understood that the outrigger leveling hydraulic system further comprises a second electromagnetic reversing valve 610 and a third electromagnetic reversing valve 620, the first oil port p of the second electromagnetic reversing valve 610 communicates with the first distribution oil port f of the first distribution and collecting valve 310, the rodless cavity of the first horizontal oil cylinder 410 and the rodless cavity of the second horizontal oil cylinder 420 both communicate with the second oil port q of the second electromagnetic reversing valve 610, the rodless cavity of the first vertical oil cylinder 510 and the rodless cavity of the second vertical oil cylinder 520 both communicate with the third oil port of the second electromagnetic reversing valve 610; the first oil port s of the third electromagnetic reversing valve 620 communicates with the second distribution oil port g of the first distribution and collecting valve 310, the rodless cavity of the third horizontal oil cylinder 430 and the rodless cavity of the fourth horizontal oil cylinder 440 both communicate with the second oil port t of the third electromagnetic reversing valve 620, the rodless cavity of the third vertical oil cylinder 530 and the rodless cavity of the fourth vertical oil cylinder 540 both communicate with the third oil port of the third electromagnetic reversing valve 620.

[0058] It should be noted that when the second electromagnetic reversing valve 610 loses power, the first oil port p of the second electromagnetic reversing valve 610 communicates with the second oil port q of the second electromagnetic reversing valve 610, and when the second electromagnetic reversing valve 610 is powered, the first oil port p of the second electromagnetic reversing valve 610 communicates with the third oil port r of the second electromagnetic reversing valve 610; when the third electromagnetic reversing valve 620 loses power, the first oil port s of the third electromagnetic reversing valve 620 communicates with the second oil port t of the third electromagnetic reversing valve 620, and when the third electromagnetic reversing valve 620 is powered, the first oil port s of the third electromagnetic reversing valve 620 communicates with the third oil port v of the third electromagnetic reversing valve 620.

[0059] Therefore, when it is necessary to make the first horizontal oil cylinder 410, the second horizontal oil cylinder 420, the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440 extend and retract, the second electromagnetic reversing valve 610 and the third electromagnetic reversing valve 620 can be de-energized, so that the first shunt port f of the first shunt valve 310 communicates with the rodless chamber of the first horizontal oil cylinder 410 and the rodless chamber of the second horizontal oil cylinder 420, and the second shunt port g of the first shunt valve 310 communicates with the rodless chamber of the third horizontal oil cylinder 430 and the rodless chamber of the fourth horizontal oil cylinder 440, so as to achieve the purpose of extending and retracting the first horizontal oil cylinder 410, the second horizontal oil cylinder 420, the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440.

[0060] When it is necessary to make the first vertical oil cylinder 510, the second vertical oil cylinder 520, the third vertical oil cylinder 530 and the fourth vertical oil cylinder 540 extend and retract, the second electromagnetic reversing valve 610 and the third electromagnetic reversing valve 620 can be energized, so that the first shunt port f of the first shunt valve 310 communicates with the rodless chamber of the first vertical oil cylinder 510 and the rodless chamber of the second vertical oil cylinder 520, and the second shunt port g of the first shunt valve 310 communicates with the rodless chamber of the third vertical oil cylinder 530 and the rodless chamber of the fourth vertical oil cylinder 540, so as to achieve the purpose of extending and retracting the first vertical oil cylinder 510, the second vertical oil cylinder 520, the third vertical oil cylinder 530 and the fourth vertical oil cylinder 540.

[0061] Referring to Figure 1 As shown in the figure, the outrigger leveling hydraulic system further comprises a first hydraulic control check valve 710, the first oil port w of the first hydraulic control check valve 710 communicates with the second oil port q of the second electromagnetic reversing valve 610, the rodless chamber of the first horizontal oil cylinder 410 and the rodless chamber of the second horizontal oil cylinder 420 both communicate with the second oil port x of the first hydraulic control check valve 710, and the control oil port of the first hydraulic control check valve 710 communicates with the first shunt port i of the second shunt valve 320.

[0062] When the first horizontal oil cylinder 410 and the second horizontal oil cylinder 420 need to be extended, the first electromagnetic reversing valve 100 can be switched to the first state, and the second electromagnetic reversing valve 610 is de-energized, so that the hydraulic oil in the hydraulic pump 210 can enter the first oil port a of the first electromagnetic reversing valve 100 and the third oil port c of the first electromagnetic reversing valve 100 in turn, and then enter the collecting oil port e of the first shunt collector valve 310, and then enter the rodless cavity of the first horizontal oil cylinder 410 and the rodless cavity of the second horizontal oil cylinder 420 through the first shunt oil port f of the first shunt collector valve 310, the first oil port p of the second electromagnetic reversing valve 610, the second oil port q of the second electromagnetic reversing valve 610, the first oil port w of the first hydraulic control check valve 710 and the second oil port x of the first hydraulic control check valve 710. The hydraulic oil in the rod cavity of the first horizontal oil cylinder 410 and the hydraulic oil in the rod cavity of the second horizontal oil cylinder 420 can enter the second shunt collector valve 320 through the first shunt oil port i of the second shunt collector valve 320 and the second shunt oil port j of the second shunt collector valve 320 respectively, and then flow to the fourth oil port d of the first electromagnetic reversing valve 100 through the collecting oil port h of the second shunt collector valve 320, and finally enter the oil tank 220 through the second oil port b of the first electromagnetic reversing valve 100 which communicates with the fourth oil port d of the first electromagnetic reversing valve 100, so as to realize the purpose of extending the first horizontal oil cylinder 410 and the second horizontal oil cylinder 420. In this process, the first hydraulic control check valve 710 is in a closed state, so that the hydraulic oil cannot flow from the second oil port x of the first hydraulic control check valve 710 to the first oil port w of the first hydraulic control check valve 710, thereby being able to maintain the pressure of the first horizontal oil cylinder 410 and the second horizontal oil cylinder 420, so as to ensure that the first horizontal oil cylinder 410 and the second horizontal oil cylinder 420 can maintain the extended state after being extended.

[0063] When it is required to retract the first horizontal oil cylinder 410 and the second horizontal oil cylinder 420, the first electromagnetic reversing valve 100 can be switched to the second state, and the second electromagnetic reversing valve 610 is de-energized, then the hydraulic oil in the hydraulic pump 210 can enter into the collecting oil port h of the second distribution and collecting valve 320 through the second oil port b of the first electromagnetic reversing valve 100 and the fourth oil port d of the first electromagnetic reversing valve 100 in turn, and then enter into the rod cavity of the first horizontal oil cylinder 410 and the second horizontal oil cylinder 420 through the first distribution oil port i of the second distribution and collecting valve 320 and the second distribution oil port j of the second distribution and collecting valve 320 respectively. At the same time, the hydraulic oil in the first distribution oil port i of the second distribution and collecting valve 320 can also enter into the control oil port of the first hydraulic control check valve 710, when the pressure of the hydraulic oil in the control oil port of the first hydraulic control check valve 710 reaches the opening pressure of the first hydraulic control check valve 710, the hydraulic oil can flow from the second oil port x of the first hydraulic control check valve 710 to the first oil port w of the first hydraulic control check valve 710, then the hydraulic oil in the rodless cavity of the first horizontal oil cylinder 410 and the hydraulic oil in the rodless cavity of the second horizontal oil cylinder 420 can enter into the first distribution oil port f of the first distribution and collecting valve 310 through the first hydraulic control check valve 710, further, the hydraulic oil entering into the first distribution oil port f of the first distribution and collecting valve 310 can enter into the third oil port c of the first electromagnetic reversing valve 100 through the collecting oil port e of the first distribution and collecting valve 310, and finally enter into the oil tank 220 through the second oil port b of the first electromagnetic reversing valve 100 communicating with the third oil port c of the first electromagnetic reversing valve 100. Thus the purpose of retracting the first horizontal oil cylinder 410 and the second horizontal oil cylinder 420 is achieved.

[0064] With reference to Figure 1 As shown in FIG. 9, it can be understood that the outrigger leveling hydraulic system further comprises a first damping pipeline 910, one end of the first damping pipeline 910 communicates with the first distribution oil port i of the second distribution and collecting valve 320, and the other end of the first damping pipeline 910 communicates with the second distribution oil port j of the second distribution and collecting valve 320; wherein the first damping pipeline 910 is provided with a first damping hole 911.

[0065] It should be noted that there is a certain distribution error between the first distribution oil port of the distribution and collecting valve and the second distribution oil port of the distribution and collecting valve, and when one of the distribution oil ports of the distribution and collecting valve is closed, the other distribution oil port of the distribution and collecting valve will also be closed.

[0066] Thus, when the first horizontal oil cylinder 410 and the second horizontal oil cylinder 420 are retracted, hydraulic oil can enter the rod cavity of the first horizontal oil cylinder 410 and the first damping pipeline 910 through the first shunt oil port i of the second shunt valve 320, and hydraulic oil can also enter the rod cavity of the second horizontal oil cylinder 420 through the second shunt oil port j of the second shunt valve 320. When the first horizontal oil cylinder 410 has reached the maximum value of the retraction stroke, but the second horizontal oil cylinder 420 has not reached the maximum value of the retraction stroke, the first shunt oil port i of the second shunt valve 320 in communication with the rod cavity of the first horizontal oil cylinder 410 is closed, and the second shunt oil port j of the second shunt valve 320 in communication with the rod cavity of the second horizontal oil cylinder 420 is closed with the closing of the first shunt oil port i of the second shunt valve 320. At this time, the hydraulic oil in the first damping pipeline 910 can slowly flow to the rod cavity of the second horizontal oil cylinder 420 through the first damping hole 911, so that the second horizontal oil cylinder 420 has the same retraction stroke as the first horizontal oil cylinder 410, further reducing the outrigger leveling error.

[0067] When the second horizontal oil cylinder 420 has reached the maximum value of the retraction stroke, but the first horizontal oil cylinder 410 has not reached the maximum value of the retraction stroke, the second shunt oil port j of the second shunt valve 320 in communication with the rod cavity of the second horizontal oil cylinder 420 is closed, and the first shunt oil port i of the second shunt valve 320 in communication with the rod cavity of the first horizontal oil cylinder 410 is closed with the closing of the first shunt oil port i of the second shunt valve 320. At this time, the hydraulic oil in the first damping pipeline 910 can slowly flow to the rod cavity of the first horizontal oil cylinder 410 through the first damping hole 911, so that the first horizontal oil cylinder 410 has the same retraction stroke as the second horizontal oil cylinder 420, further reducing the outrigger leveling error.

[0068] Referring to Figure 1 As shown in the figure, it can be understood that the outrigger leveling hydraulic system further comprises a second hydraulic control check valve 720, the first oil port y of the second hydraulic control check valve 720 is in communication with the second oil port t of the third electromagnetic reversing valve 620, the rodless cavity of the third horizontal oil cylinder 430 and the rodless cavity of the fourth horizontal oil cylinder 440 are both in communication with the second oil port z of the second hydraulic control check valve 720, and the control oil port of the second hydraulic control check valve 720 is in communication with the first shunt oil port m of the third shunt valve 330.

[0069] When the third and fourth horizontal oil cylinders 430 and 440 need to be extended, the first electromagnetic directional valve 100 is switched to the first state, and the third electromagnetic directional valve 620 is de-energized, so that the hydraulic oil in the hydraulic pump 210 can enter the collecting oil port e of the first flow and collecting valve 310 through the first oil port a of the first electromagnetic directional valve 100 and the third oil port c of the first electromagnetic directional valve 100 in turn, and then enter the rodless cavity of the third horizontal oil cylinder 430 and the rodless cavity of the fourth horizontal oil cylinder 440 through the second flow oil port g of the first flow and collecting valve 310, the first oil port s of the third electromagnetic directional valve 620, the second oil port t of the third electromagnetic directional valve 620, the first oil port y of the second hydraulic control check valve 720 and the second oil port z of the second hydraulic control check valve 720; the hydraulic oil in the rod cavity of the third horizontal oil cylinder 430 and the hydraulic oil in the rod cavity of the fourth horizontal oil cylinder 440 can enter the third flow and collecting valve 330 through the first flow oil port m of the third flow and collecting valve 330 and the second flow oil port n of the third flow and collecting valve 330 respectively, and then flow to the fourth oil port d of the first electromagnetic directional valve 100 through the collecting oil port k of the third flow and collecting valve 330, and finally enter the oil tank 220 through the second oil port b of the first electromagnetic directional valve 100 which communicates with the fourth oil port d of the first electromagnetic directional valve 100, so as to realize the purpose of extending the third and fourth horizontal oil cylinders 430 and 440. In this process, the second hydraulic control check valve 720 is in the closed state, so that the hydraulic oil cannot flow from the second oil port z of the second hydraulic control check valve 720 to the first oil port y of the second hydraulic control check valve 720, thereby being able to maintain the pressure of the third and fourth horizontal oil cylinders 430 and 440, so as to ensure that the third and fourth horizontal oil cylinders 430 and 440 can maintain the extended state after being extended.

[0070] When it is needed to retract the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440, the first electromagnetic reversing valve 100 can be switched to the second state, and the third electromagnetic reversing valve 620 is de-energized, then the hydraulic oil in the hydraulic pump 210 can enter into the collecting oil port k of the third distributing and collecting valve 330 through the second oil port b of the first electromagnetic reversing valve 100 and the fourth oil port d of the first electromagnetic reversing valve 100 in turn, and then enter into the rod cavity of the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440 through the first distributing oil port m of the third distributing and collecting valve 330 and the second distributing oil port n of the third distributing and collecting valve 330 respectively. At the same time, the hydraulic oil in the first distributing oil port m of the third distributing and collecting valve 330 can also enter into the control oil port of the second hydraulic control check valve 720, when the pressure of the hydraulic oil in the control oil port of the second hydraulic control check valve 720 reaches the opening pressure of the second hydraulic control check valve 720, the hydraulic oil can flow from the second oil port z of the second hydraulic control check valve 720 to the first oil port y of the second hydraulic control check valve 720, then the hydraulic oil in the rodless cavity of the third horizontal oil cylinder 430 and the hydraulic oil in the rodless cavity of the fourth horizontal oil cylinder 440 can enter into the second distributing oil port g of the first distributing and collecting valve 310 through the second hydraulic control check valve 720, further, the hydraulic oil in the second distributing oil port g of the first distributing and collecting valve 310 can enter into the third oil port c of the first electromagnetic reversing valve 100 through the collecting oil port e of the first distributing and collecting valve 310, and finally enter into the oil tank 220 through the second oil port b of the first electromagnetic reversing valve 100 which communicates with the third oil port c of the first electromagnetic reversing valve 100. Thus the purpose of retracting the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440 is achieved.

[0071] With reference to Figure 1 As shown in FIG. 9, it can be understood that the outrigger leveling hydraulic system further comprises a second damping pipeline 920, one end of the second damping pipeline 920 communicates with the first distributing oil port m of the third distributing and collecting valve 330, and the other end of the second damping pipeline 920 communicates with the second distributing oil port n of the third distributing and collecting valve 330; wherein the second damping pipeline 920 is provided with a second damping hole 921.

[0072] Thus, when the third horizontal oil cylinder 430 and the fourth horizontal oil cylinder 440 are retracted, hydraulic oil can enter the rod cavity of the third horizontal oil cylinder 430 through the first shunt oil port m of the third shunt valve 330 and the second damping pipeline 920, and hydraulic oil can also enter the rod cavity of the fourth horizontal oil cylinder 440 through the second shunt oil port n of the third shunt valve 330. When the third horizontal oil cylinder 430 has reached the maximum value of the retraction stroke, but the fourth horizontal oil cylinder 440 has not reached the maximum value of the retraction stroke, the first shunt oil port m of the third shunt valve 330 communicating with the rod cavity of the third horizontal oil cylinder 430 is closed, and the second shunt oil port n of the third shunt valve 330 communicating with the rod cavity of the fourth horizontal oil cylinder 440 is closed with the closing of the first shunt oil port m of the third shunt valve 330. At this time, the hydraulic oil in the second damping pipeline 920 can slowly flow to the rod cavity of the fourth horizontal oil cylinder 440 through the second damping hole 921, so that the fourth horizontal oil cylinder 440 has the same retraction stroke as the third horizontal oil cylinder 430, further reducing the leg leveling error.

[0073] When the fourth horizontal oil cylinder 440 has reached the maximum value of the retraction stroke, but the third horizontal oil cylinder 430 has not reached the maximum value of the retraction stroke, the second shunt oil port n of the third shunt valve 330 communicating with the rod cavity of the fourth horizontal oil cylinder 440 is closed, and the first shunt oil port m of the third shunt valve 330 communicating with the rod cavity of the third horizontal oil cylinder 430 is closed with the closing of the second shunt oil port n of the third shunt valve 330. At this time, the hydraulic oil in the second damping pipeline 920 can slowly flow to the rod cavity of the third horizontal oil cylinder 430 through the second damping hole 921, so that the third horizontal oil cylinder 430 has the same retraction stroke as the fourth horizontal oil cylinder 440, further reducing the leg leveling error.

[0074] Referring to Figure 1 It can be understood that the leg leveling hydraulic system further comprises a third damping pipeline 930, one end of the third damping pipeline 930 communicates with the first shunt oil port f of the first shunt valve 310, and the other end of the third damping pipeline 930 communicates with the second shunt oil port g of the first shunt valve 310; wherein the third damping pipeline 930 is provided with a third damping hole 931.

[0075] Thus, when the first electromagnetic directional valve 100 is in the first state, i.e., the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder are extended, the hydraulic oil in the hydraulic pump 210 can enter the first flow and collecting valve 310 through the first oil port a of the first electromagnetic directional valve 100, the third oil port c of the first electromagnetic directional valve 100 and the collecting oil port e of the first flow and collecting valve 310, and then flow to the rodless cavities of the first oil cylinder and the second oil cylinder through the first flow port f of the first flow and collecting valve 310, and flow to the rodless cavities of the third oil cylinder and the fourth oil cylinder through the second flow port g of the first flow and collecting valve 310. In this process, when the extension strokes of the first oil cylinder and the second oil cylinder have reached the maximum value of the extension stroke, but the extension strokes of the third oil cylinder and the fourth oil cylinder have not reached the maximum value of the extension stroke, the first flow port f of the first flow and collecting valve 310 communicating with the rodless cavities of the first oil cylinder and the second oil cylinder is closed, the second flow port g of the first flow and collecting valve 310 communicating with the rodless cavities of the third oil cylinder and the fourth oil cylinder is closed with the closing of the first flow port f of the first flow and collecting valve 310, at this time, the hydraulic oil in the third damping pipeline 930 can slowly flow to the rodless cavities of the third oil cylinder and the fourth oil cylinder through the third damping hole 931, so that the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder have the same extension stroke, and the leg leveling error is further reduced.

[0076] When the extension strokes of the third oil cylinder and the fourth oil cylinder have reached the maximum value of the extension stroke, but the extension strokes of the first oil cylinder and the second oil cylinder have not reached the maximum value of the extension stroke, the second flow port g of the first flow and collecting valve 310 communicating with the rodless cavities of the third oil cylinder and the fourth oil cylinder is closed, the first flow port f of the first flow and collecting valve 310 communicating with the rodless cavities of the first oil cylinder and the second oil cylinder is closed with the closing of the second flow port g of the first flow and collecting valve 310, at this time, the hydraulic oil in the third damping pipeline 930 can slowly flow to the rodless cavities of the first oil cylinder and the second oil cylinder through the third damping hole 931, so that the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder have the same extension stroke, and the leg leveling error is further reduced.

[0077] The aerial work platform of one embodiment of the present application comprises the leg leveling hydraulic system as described above.

[0078] In the above-mentioned aerial work platform, since the above-mentioned leg leveling hydraulic system connected with the legs of the aerial work platform can improve the leveling effect of the legs, the above-mentioned aerial work platform has better stability during lifting or lowering, so that the safety of the above-mentioned aerial work platform can be further improved.

[0079] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A hydraulic outrigger leveling system, characterized in that, Comprise: A first electromagnetic directional valve, a first oil port of the first electromagnetic directional valve is used for communicating with a hydraulic pump, a second oil port of the first electromagnetic directional valve is used for communicating with an oil tank, in the case that the first electromagnetic directional valve is in a first state, the first oil port of the first electromagnetic directional valve communicates with a third oil port of the first electromagnetic directional valve, a fourth oil port of the first electromagnetic directional valve communicates with the second oil port of the first electromagnetic directional valve, in the case that the first electromagnetic directional valve is in a second state, the first oil port of the first electromagnetic directional valve communicates with the fourth oil port of the first electromagnetic directional valve, the third oil port of the first electromagnetic directional valve communicates with the second oil port of the first electromagnetic directional valve; A shunt and collecting unit, the shunt and collecting unit comprises a first shunt and collecting valve, a second shunt and collecting valve and a third shunt and collecting valve, a collecting oil port of the first shunt and collecting valve communicates with the third oil port of the first electromagnetic directional valve, the collecting oil port of the second shunt and collecting valve and the collecting oil port of the third shunt and collecting valve both communicate with the fourth oil port of the first electromagnetic directional valve; and A cylinder unit, the cylinder unit comprises a first cylinder, a second cylinder, a third cylinder and a fourth cylinder, a rodless chamber of the first cylinder and a rodless chamber of the second cylinder both communicate with a first shunt oil port of the first shunt and collecting valve, a rod chamber of the first cylinder communicates with a first shunt oil port of the second shunt and collecting valve, a rod chamber of the second cylinder communicates with a second shunt oil port of the second shunt and collecting valve, a rodless chamber of the third cylinder and a rodless chamber of the fourth cylinder both communicate with a second shunt oil port of the first shunt and collecting valve, a rod chamber of the third cylinder communicates with a first shunt oil port of the third shunt and collecting valve, a rod chamber of the fourth cylinder communicates with a second shunt oil port of the third shunt and collecting valve; Wherein, the first cylinder is a first horizontal cylinder, the second cylinder is a second horizontal cylinder, the third cylinder is a third horizontal cylinder, and the fourth cylinder is a fourth horizontal cylinder; The cylinder unit further comprises a first vertical cylinder, a second vertical cylinder, a third vertical cylinder and a fourth vertical cylinder, a rodless chamber of the first vertical cylinder and a rodless chamber of the second vertical cylinder both communicate with the first shunt oil port of the first shunt and collecting valve, a rod chamber of the first vertical cylinder communicates with the first shunt oil port of the second shunt and collecting valve, a rod chamber of the second vertical cylinder communicates with the second shunt oil port of the second shunt and collecting valve, a rodless chamber of the third vertical cylinder and a rodless chamber of the fourth cylinder both communicate with the second shunt oil port of the first shunt and collecting valve, a rod chamber of the third vertical cylinder communicates with the first shunt oil port of the third shunt and collecting valve, and a rod chamber of the fourth vertical cylinder communicates with the second shunt oil port of the third shunt and collecting valve. The outrigger leveling hydraulic system further comprises a second electromagnetic reversing valve and a third electromagnetic reversing valve, a first oil port of the second electromagnetic reversing valve is communicated with a first shunt oil port of the first shunt and collecting valve, a rodless chamber of the first horizontal oil cylinder and a rodless chamber of the second horizontal oil cylinder are both communicated with a second oil port of the second electromagnetic reversing valve, a rodless chamber of the first vertical oil cylinder and a rodless chamber of the second vertical oil cylinder are both communicated with a third oil port of the second electromagnetic reversing valve; a first oil port of the third electromagnetic reversing valve is communicated with a second shunt oil port of the first shunt and collecting valve, a rodless chamber of the third horizontal oil cylinder and a rodless chamber of the fourth horizontal oil cylinder are both communicated with a second oil port of the third electromagnetic reversing valve, a rodless chamber of the third vertical oil cylinder and a rodless chamber of the fourth vertical oil cylinder are both communicated with a third oil port of the third electromagnetic reversing valve.

2. The leg leveling hydraulic system of claim 1, wherein, The outrigger leveling hydraulic system further comprises a first hydraulic control check valve, a first oil port of the first hydraulic control check valve is communicated with the second oil port of the second electromagnetic reversing valve, a rodless chamber of the first horizontal oil cylinder and a rodless chamber of the second horizontal oil cylinder are both communicated with a second oil port of the first hydraulic control check valve, a control oil port of the first hydraulic control check valve is communicated with the first shunt oil port of the second shunt and collecting valve.

3. The leg leveling hydraulic system of claim 2, wherein, The outrigger leveling hydraulic system further comprises a first damping pipeline, one end of the first damping pipeline is communicated with the first shunt oil port of the second shunt and collecting valve, the other end of the first damping pipeline is communicated with the second shunt oil port of the second shunt and collecting valve; wherein a first damping hole is arranged on the first damping pipeline.

4. The leg leveling hydraulic system of claim 1, wherein, The outrigger leveling hydraulic system further comprises a second hydraulic control check valve, a first oil port of the second hydraulic control check valve is communicated with the second oil port of the third electromagnetic reversing valve, a rodless chamber of the third horizontal oil cylinder and a rodless chamber of the fourth horizontal oil cylinder are both communicated with a second oil port of the second hydraulic control check valve, a control oil port of the second hydraulic control check valve is communicated with the first shunt oil port of the third shunt and collecting valve.

5. The leg leveling hydraulic system of claim 4, wherein, The outrigger leveling hydraulic system further comprises a second damping pipeline, one end of the second damping pipeline is communicated with the first shunt oil port of the third shunt and collecting valve, the other end of the second damping pipeline is communicated with the second shunt oil port of the third shunt and collecting valve; wherein a second damping hole is arranged on the second damping pipeline.

6. The jack-up hydraulic system of claim 1, wherein, The outrigger leveling hydraulic system further comprises a third damping pipeline, one end of the third damping pipeline is communicated with the first shunt oil port of the first shunt and collecting valve, the other end of the third damping pipeline is communicated with the second shunt oil port of the first shunt and collecting valve; wherein a third damping hole is arranged on the third damping pipeline.

7. An aerial work platform vehicle characterized by, The outrigger leveling hydraulic system comprises: The outrigger leveling hydraulic system according to any one of claims 1 to 6.

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