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CN-111894921-B - Hydraulic system of telescopic boom, telescopic boom and engineering vehicle

CN111894921BCN 111894921 BCN111894921 BCN 111894921BCN-111894921-B

Abstract

The application discloses a hydraulic system of a telescopic boom, the telescopic boom and an engineering vehicle, which comprise a first oil way, a multistage telescopic cylinder, a second oil way, a balance valve, a back pressure valve and a control oil way, wherein rodless cavities of the telescopic cylinders are communicated with the first oil way, rodless cavities of the telescopic cylinders are synchronously oil-fed or oil-fed through the first oil way, rod cavities of the telescopic cylinders are communicated with the second oil way, rod cavities of the telescopic cylinders are synchronously oil-fed or oil-fed through the second oil way, the balance valve is arranged on the first oil way, the control oil way is communicated with a control end of the balance valve and the second oil way, the back pressure valve is arranged on the first oil way, and the back pressure valve is arranged on the oil-feeding side of the balance valve so as to generate preset back pressure on the first oil way. The hydraulic system of the telescopic boom, the telescopic boom and the engineering vehicle can effectively reduce shake.

Inventors

  • QING LICHUN
  • GUO FANGYUN
  • LI HONGSHU
  • CHEN GUOPING

Assignees

  • 湖南双达智能设备有限公司
  • 湖南双达机电有限责任公司

Dates

Publication Date
20260421
Application Date
20200730
Priority Date
20200730

Claims (8)

  1. 1. The telescopic boom is characterized by comprising a multi-stage boom section (100) and a hydraulic system which are mutually sleeved, wherein the hydraulic system comprises a first oil way (1), a multi-stage telescopic cylinder (2), a second oil way (3), a balance valve (4), a back pressure valve (5) and a control oil way (7); The rod-free cavities (21) of the telescopic cylinders (2) are communicated with the first oil way (1), and the rod-free cavities (21) of the telescopic cylinders (2) are used for synchronously feeding oil or returning oil through the first oil way (1), the rod-containing cavities (22) of the telescopic cylinders (2) are communicated with the second oil way (3), and the rod-containing cavities (22) of the telescopic cylinders (2) are used for synchronously feeding oil or returning oil through the second oil way (3); The balance valve (4) is arranged on the first oil way (1), and the control oil way (7) is communicated with the control end (43) of the balance valve (4) and the second oil way (3); The back pressure valve (5) is arranged on the first oil way (1), and the back pressure valve (5) is arranged on the oil inlet side of the balance valve (4) so as to generate preset oil return back pressure for the first oil way (1); two adjacent arm joints (100) are respectively connected through at least one telescopic cylinder (2), and the telescopic cylinders (2) can drive the corresponding arm joints (100) to stretch through stretching; When the telescopic boom is in a retracted state, all the telescopic cylinders (2) are distributed at intervals on the periphery of the outermost boom section (100); the control oil way (7) comprises a first throttling port (71); The hydraulic system comprises a diversion oil circuit (8) with a second throttling port (81), a first end of the diversion oil circuit (8) is connected to a control oil circuit (7) between the first throttling port (71) and the control end (43), a second end of the diversion oil circuit (8) is communicated with the first oil circuit (1) on the oil inlet side of the balance valve (4) to realize diversion, and when the first oil circuit (1) or the second oil circuit (3) is used for oil inlet, the diversion oil circuit (8) is communicated with the first oil circuit (1) and the second oil circuit (3); The diameter of the first orifice (71) is larger than that of the second orifice (81).
  2. 2. The telescopic boom according to claim 1, wherein the telescopic cylinder (2) comprises a piston (23), a piston rod (25) and a cylinder body (24), the piston (23) is movably arranged in the cylinder body (24) to isolate the rodless cavity (21) and the rod-shaped cavity (22), a first working oil port (241) communicated with the rodless cavity (21) is formed on the cylinder body (24), a process flow passage (26) penetrating through the piston (23) and the piston rod (25) is formed on the telescopic cylinder (2), a first end port of the process flow passage (26) is communicated with the rodless cavity (21), and a second end port of the process flow passage (26) is arranged on a structure of the piston rod (25) positioned outside the cylinder body (24); Between two adjacent telescopic cylinders (2), a second end port of the process flow channel (26) of the telescopic cylinder (2) at the upper stage is communicated with the first working oil port (241) of the cylinder body (24) of the telescopic cylinder (2) at the lower stage; the first oil way (1) is communicated with the first working oil port (241) of the telescopic cylinder (2) at the first stage, so that synchronous oil inlet or oil return of a plurality of rodless cavities (21) of the telescopic cylinder (2) through the first oil way (1) is realized.
  3. 3. The telescopic boom according to claim 1, characterized in that the telescopic cylinder (2) comprises a piston (23), a piston rod (25) and a cylinder body (24), the piston (23) is movably arranged in the cylinder body (24) to isolate the rodless cavity (21) and the rod cavity (22), and a second working hole (242) and a third working hole (243) which are communicated with the rod cavity (22) are formed on the cylinder body (24); Between two adjacent telescopic cylinders (2), the third working hole (243) of the cylinder body (24) of the telescopic cylinder (2) at the previous stage is communicated with the second working hole (242) of the cylinder body (24) of the telescopic cylinder (2) at the next stage; The second oil way (3) is communicated with the second working hole (242) of the telescopic cylinder (2) at the first stage, so that synchronous oil inlet or oil return of the rod cavities (22) of the telescopic cylinders (2) through the second oil way (3) is realized.
  4. 4. The telescopic boom according to claim 1, wherein the balancing valve (4) comprises a first one-way valve (41) and a sequence valve (42), a first oil inlet (411) of the first one-way valve (41) is communicated with a first side of the first oil path (1), a first oil outlet (412) of the first one-way valve (41) is communicated with a second side of the first oil path (1), a second oil inlet (421) of the sequence valve (42) is communicated with a second side of the first oil path (1), a second oil outlet (422) of the sequence valve (42) is communicated with the first side of the first oil path (1), and a control end (43) of the balancing valve (4) is arranged on the sequence valve (42).
  5. 5. The telescopic boom according to claim 1 or 4, characterized in that the communication pipeline between the telescopic cylinders (2) of the multiple stages is a hard pipe.
  6. 6. Telescopic boom according to claim 1, characterized in that the hydraulic system comprises an accumulator (9), which accumulator (9) is arranged on the second oil circuit (3).
  7. 7. The telescopic boom according to claim 1, wherein the hydraulic system comprises a second one-way valve (120), a throttle valve (130) and a third oil path (140), the third oil path (140) is connected between the first oil path (1) and the second oil path (3), the second one-way valve (120) and the throttle valve (130) are both arranged on the third oil path (140), the throttle valve (130) is arranged on the oil outlet side of the second one-way valve (120), and oil in the third oil path (140) can flow to the first oil path (1) through the second one-way valve (120).
  8. 8. Engineering vehicle, characterized in that it comprises a vehicle body (300) and a telescopic boom (200) according to any of claims 1-7, said telescopic boom (200) being arranged on said vehicle body (300).

Description

Hydraulic system of telescopic boom, telescopic boom and engineering vehicle Technical Field The present disclosure relates to hydraulic systems, and particularly to a hydraulic system for a telescopic boom, and an engineering vehicle. Background In the prior art, equipment for maintenance operations such as aircraft deicing is generally maintenance vehicles, the maintenance vehicles mainly comprise an automobile chassis, a slewing mechanism, a turntable, an arm support, an amplitude variation mechanism and a working bucket, the arm support comprises a main arm and a fly arm connected to the tail end of the main arm, the amplitude variation mechanism comprises a main amplitude variation mechanism and a fly arm amplitude variation mechanism, the slewing mechanism is arranged on the automobile chassis, the turntable is arranged on the slewing mechanism, the arm support is arranged on the turntable, the main amplitude variation mechanism is arranged between the turntable and the main arm and used for changing the pitching angle of the main arm, the fly arm amplitude variation mechanism is arranged between the main arm and the fly arm and used for changing the pitching angle of the fly arm, the working bucket is arranged at the tail end of the fly arm, and the arm support is folded at the top of the overhead working vehicle in a driving state. The arm support is driven by a plurality of telescopic cylinders when telescopic, and the oil paths have large flow difference, so that shaking occurs. Disclosure of Invention In view of the foregoing, it is desirable to provide a hydraulic system of a telescopic boom, and an engineering vehicle, so as to reduce shake. In order to achieve the above object, the technical solution of the embodiment of the present application is as follows: The hydraulic system of the telescopic boom comprises a first oil way, a multistage telescopic cylinder, a second oil way, a balance valve, a back pressure valve and a control oil way, wherein rodless cavities of the telescopic cylinders are communicated with the first oil way, the rodless cavities of the telescopic cylinders are used for synchronously feeding oil or returning oil through the first oil way, rod cavities of the telescopic cylinders are communicated with the second oil way, rod cavities of the telescopic cylinders are used for synchronously feeding oil or returning oil through the second oil way, the balance valve is arranged on the first oil way, the control oil way is used for communicating the control end of the balance valve with the second oil way, the back pressure valve is arranged on the first oil way, and the back pressure valve is arranged on the oil feeding side of the balance valve so as to generate preset back pressure for returning oil of the first oil way. Further, the control oil passage includes a first restriction. Further, the hydraulic system comprises a diversion oil path with a second throttling port, a first end of the diversion oil path is connected to a control oil path between the first throttling port and the control end, and a second end of the diversion oil path is communicated with the first oil path on the oil inlet side of the balance valve. Further, the hydraulic system comprises a diversion oil path with a second throttling port, a first end of the diversion oil path is communicated with the control oil path, and a second end of the diversion oil path is communicated with the first oil path on the oil inlet side of the balance valve so as to achieve diversion. The telescopic cylinder comprises a cylinder body, a piston rod and a cylinder body, wherein the piston is movably arranged in the cylinder body to isolate a rodless cavity and a rod cavity, a first working oil port communicated with the rodless cavity is formed in the cylinder body, a process flow passage penetrating through the piston and the piston rod is formed in the telescopic cylinder, a first end port of the process flow passage is communicated with the rodless cavity, a second end port of the process flow passage is arranged on a structure of the piston rod positioned outside the cylinder body, the second end ports of the process flow passages of the telescopic cylinders at the upper stage are communicated with the first working oil port of the cylinder body of the telescopic cylinder at the lower stage, and the first oil way is communicated with the first working oil port of the telescopic cylinder at the first stage, so that synchronous oil inlet or oil return of the rodless cavities of the telescopic cylinders through the first oil way is realized. Further, the telescopic cylinder comprises a piston, a piston rod and a cylinder body, wherein the piston is movably arranged in the cylinder body to isolate the rodless cavity and the rod cavity, a second working hole and a third working hole which are communicated with the rod cavity are formed in the cylinder body, the third working hole of the cylinder body of the telescopic