CN216666060U

CN216666060U - Sensitive prefill valve of area pressurize function load

Info

Publication number: CN216666060U
Application number: CN202123267653.0U
Authority: CN
Inventors: 蒙学刘
Original assignee: Guangdong Tingjia Hydraulic Technology Co ltd
Current assignee: Guangdong Tingjia Hydraulic Technology Co ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-06-03
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses a load-sensitive liquid filling valve with a pressure maintaining function, which is characterized in that a liquid filling/unloading valve bank is a two-position three-way valve, an LS valve bank is a two-position two-way valve, the pressure maintaining valve bank consists of a one-way valve, a filter and a throttle valve, and a shuttle valve is a three-position three-way valve and can be switched into a load-sensitive single-way liquid filling valve to be applied to a single-circuit full-hydraulic dynamic braking system by canceling the shuttle valve for the application to the double-circuit full-hydraulic dynamic braking system. The advantages are that: the hydraulic dynamic braking system is used for tire type walking machinery equipped with a load sensitive hydraulic system, and can be also suitable for the load sensitive hydraulic system under the condition of not additionally increasing a constant delivery pump or other hydraulic accessories, so that the installation space is reduced, the manufacturing cost is reduced, and the running safety of the tire type walking machinery is ensured. Advanced and reasonable design, simple structure, easy manufacture, convenient installation and use, safety and reliability.

Description

Load sensitive liquid filling valve with pressure maintaining function

Technical Field

The utility model belongs to the hydraulic technology in the field of tire type walking machinery, and particularly relates to a load sensitive liquid filling valve with a pressure maintaining function.

Background

At present, the full hydraulic dynamic braking system is widely applied to various tire type walking machines. The full hydraulic brake system mainly comprises an oil source, a liquid charging valve, a brake and relevant connecting pipelines. Due to safety requirements, the tire type walking machine can also perform braking for a plurality of times after suddenly losing an oil source. Most of oil sources of the current full hydraulic dynamic braking system still adopt fixed displacement pumps, such as gear pumps, vane pumps, fixed displacement plunger pumps and the like, and if the full hydraulic dynamic braking system is used on a tire type walking machine provided with a load sensitive hydraulic system, a set of fixed displacement pumps or other hydraulic accessories, such as priority valves and the like, need to be additionally added, so that the arrangement of the machine is more restricted, and the manufacturing cost is greatly increased. Reference 1, application No.: CN2014100174677, name of the utility model: the liquid charging valve comprises a body and a switch valve core oil cylinder body which are connected together, wherein a high-pressure side oil port and a low-pressure side oil port which are communicated are formed in the body, and a switch valve core which can slide along the axial direction and is hollow is arranged in the inner cavities of the body and the switch valve core oil cylinder body. The spring is arranged in the cavity inside the switch valve core, the upper end of the switch valve core is tightly attached to the body under the action of the spring to enable the high-pressure side oil port and the low-pressure side oil port to be separated, the inner cavity of the oil cylinder body of the switch valve core is divided into two chambers by the lower end of the switch valve core, the upper chamber is provided with a valve core opening oil port, and the lower chamber is provided with a stamping oil port. The upper end of a cavity in the switch valve core is communicated with the high-pressure side oil port through a small hole, and the lower part of the cavity is communicated with the lower cavity of the switch valve core oil cylinder body. Reference 2, application No.: CN 111332266A, invention name: the electric control brake hydraulic system comprises a gear pump and an electric proportional liquid charging valve connected with an oil outlet of the gear pump, wherein the electric proportional liquid charging valve is connected with a brake system through a safety energy storage valve; the braking system comprises a first energy accumulator, a first pressure sensor and a first braking bridge which are positioned on a first braking oil path, and a second energy accumulator, a second pressure sensor and a second braking bridge which are positioned on a second braking oil path, wherein braking valves used for controlling the first braking bridge and the second braking bridge to move are arranged on the first braking oil path and the second braking oil path, and the first pressure sensor and the second pressure sensor respectively detect pressure values of the first energy accumulator and the second energy accumulator. The engineering machinery comprises the brake hydraulic system. The structural features of the comparison documents 1, 2 are different from those of the present patent application.

Disclosure of Invention

The utility model aims to provide a load-sensitive liquid filling valve with a pressure maintaining function, which is used on a tire type walking machine provided with a load-sensitive hydraulic system, so that a full-hydraulic dynamic braking system can be also suitable for the load-sensitive hydraulic system under the condition of not additionally adding a constant delivery pump or other hydraulic accessories, the installation space is reduced, the manufacturing cost is reduced, and the driving safety of the tire type walking machine is ensured.

The technical scheme adopted for achieving the purpose is as follows: a kind of sensitive liquid filling valve of load with pressure maintaining function, including the sensitive hydraulic pump of load, the sensitive liquid filling valve of load, pressurize the valve bank, fill liquid/unload the valve bank, LS valve bank, check valve bank, shuttle valve, parking control loop, energy accumulator, brake valve, axle brake, steering cylinder, sensitive direction valve of load, multiple unit valve, flushing valve, compensating valve, check valve, filter and choke valve, characterized by that the sensitive liquid filling valve 2 of load includes the liquid filling/unload valve bank 2-2, LS valve bank 2-3, pressurize valve bank 2-1, check valve bank 2-4, shuttle valve 2-5, the said liquid filling/unload valve bank 2-2 is a two-position three-way valve; the LS valve group 2-3 is a two-position two-way valve; the pressure maintaining valve group 2-1 consists of a one-way valve 2-1-1, a filter 2-1-2 and a throttle valve 2-1-3; the shuttle valve 2-5 is a three-position three-way valve, the load sensitive hydraulic system comprises a full hydraulic power braking system, a steering system and a working system, wherein the full hydraulic power braking system comprises a load sensitive hydraulic pump 1, a load sensitive liquid charging valve 2, a parking control loop 3, an energy accumulator 4, a braking valve 5 and an axle brake 6, the steering system comprises a load sensitive direction valve 8 and a steering oil cylinder 7, the working system comprises a multi-way valve 9, a flushing valve 9-1 and a compensation valve 9-2, the load sensitive hydraulic pump 1 of the load sensitive liquid charging valve hydraulic system is respectively connected with the load sensitive liquid charging valve 2, the load sensitive direction valve 8 and the multi-way valve 9, the load sensitive direction valve 8 is connected with the steering oil cylinder 7, the load sensitive liquid charging valve 2 is connected with the energy accumulator 4, the energy accumulator 4 is connected with the braking valve 5, the braking valve 5 is connected with the axle brake 6, the method comprises the steps that return oil of a parking control loop 3 of a load sensitive liquid filling valve 2, a load sensitive hydraulic pump 1 and a multi-way valve 9 flows to a collecting cylinder, a pressure maintaining valve group 2-1 of the load sensitive liquid filling valve 2 is connected with a Y interface and a shuttle valve 2-5 and is connected with a liquid filling valve/unloading valve group 2-2, the liquid filling valve/unloading valve group 2-2 is connected with an LS valve group 2-3 and a T interface, the pressure maintaining valve group 2-1 is connected with a P interface, the pressure maintaining valve group 2-1 is connected with the LS valve group 2-3, the LS valve group 2-3 is connected with an interface LS and a one-way valve group 2-4, the shuttle valve 2-5 is connected with an A, B interface, and the interfaces A, B, Y, P, LS1 and T form an oil return system.

Compared with the prior art, the utility model has the outstanding effects that: a load-sensitive liquid filling valve with a pressure maintaining function is used for a tire type walking machine provided with a load-sensitive hydraulic system, so that a full-hydraulic dynamic braking system can be also suitable for the load-sensitive hydraulic system under the condition of not additionally increasing a constant delivery pump or other hydraulic accessories, the installation space is reduced, the manufacturing cost is reduced, and the running safety of the tire type walking machine is ensured. The utility model is applied to a double-loop full hydraulic power braking system, and can be switched into a load-sensitive single-loop liquid filling valve by canceling the shuttle valve, so that the utility model is applied to a single-loop full hydraulic power braking system. Advanced design, simple and reasonable structure, easy manufacture, convenient installation and use, safety and reliability.

Drawings

FIG. 1 is a schematic diagram of a load sensitive prefill valve assembly and hydraulic system process route of the present invention.

FIG. 2 is a schematic diagram of the prefill valve structure of the present invention.

Reference numerals: the hydraulic brake system comprises a load sensitive hydraulic pump 1, a load sensitive liquid filling valve 2, a pressure maintaining valve group 2-1, a liquid filling/unloading valve group 2-2, an LS valve group 2-3, a one-way valve group 2-4, a shuttle valve 2-5, a parking control loop 3, an energy accumulator 4, a brake valve 5, an axle brake 6, a steering cylinder 7, a load sensitive direction valve 8, a multi-way valve 9, a flushing valve 9-1, a compensation valve 9-2, a one-way valve 2-1-1, a filter 2-1-2 and a throttle valve 2-1-3.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

embodiment 1, a load-sensitive filling valve with a pressure maintaining function, includes a filling/unloading valve set 2-2, an LS valve set 2-3, a pressure maintaining valve set 2-1, a check valve set 2-4, and a shuttle valve 2-5, where the filling/unloading valve set 2-2 is a two-position three-way valve; the LS valve group 2-3 is a two-position two-way valve; the pressure maintaining valve group 2-1 consists of a one-way valve 2-1-1, a filter 2-1-2 and a throttle valve 2-1-3; the shuttle valve 2-5 is a three-position three-way valve.

1) The liquid filling/unloading valve group 2-2 automatically transmits hydraulic oil to the left end of the LS valve group 2-3 or discharges the hydraulic oil through the hydraulic oil pressure of an energy accumulator 4 in the induction system; when the hydraulic oil pressure of the energy accumulator 4 is lower than the lower limit pressure set by the load sensitive liquid charging valve 2, the hydraulic oil pressure acting on the left end of the liquid charging/unloading valve bank 2-2 is lower than the spring force of the right end of the liquid charging/unloading valve bank 2-2, the liquid charging/unloading valve bank 2-2 works at the right position under the action of the spring force of the right end, the liquid charging/unloading valve bank 2-2 conveys the hydraulic oil to the left side of the LS valve bank 2-3, the sum of the spring force on the left side of the LS valve bank 2-3 and the hydraulic oil pressure is larger than the hydraulic oil pressure on the right side of the LS valve bank 2-3, the LS valve bank 2-3 works at the left position, the LS valve bank 2-3 is communicated with the oil passages of a P port of the load sensitive liquid charging valve 2 and an LS port of the load sensitive liquid charging valve 2, the hydraulic oil is output as pressure signal oil through the LS port, and a part of the pressure signal oil output by the LS port acts on a compensating valve 9-2 and a load sensitive liquid charging valve 9 The other part of the hydraulic sensing pump 1 flows back to the oil tank from a flushing valve 9-1 of the multi-way valve 9; the pressure signal oil acting on the compensating valve 9-2 of the multi-way valve 9 and the load sensitive hydraulic pump 1 enables the load sensitive pump 1 to start working and improves the system pressure, thereby achieving the purpose of charging the energy accumulator 4; when the hydraulic oil pressure of the accumulator 4 reaches the upper limit pressure set by the load sensitive charging valve 2, the hydraulic oil pressure acting on the left end of the charging/unloading valve bank 2-2 is larger than the spring force of the right end of the charging/unloading valve bank 2-2, the charging/unloading valve bank 2-2 works in the left position under the action of the hydraulic oil pressure of the left end, the charging/unloading valve bank 2-2 connects the left hydraulic oil of the LS valve bank 2-3 back to the oil tank through the T port, the LS valve bank 2-3 overcomes the spring force of the left side of the LS valve bank 2-3 under the action of the hydraulic oil, the LS valve bank 2-3 works in the right position, the LS valve bank 2-3 cuts off the oil path from the P port of the load sensitive charging valve 2 to the LS port of the load sensitive charging valve 2, the load sensitive charging valve 2 does not output pressure signal oil any more, and the pressure signal oil from the LS port of the load sensitive charging valve 2 to the pipelines of the load sensitive hydraulic pump 1 and the valve 9 is not output pressure signal oil And then the oil flows back to the oil tank through the flushing valve 9-1 in the multi-way valve 9 to complete system unloading, the load-sensitive hydraulic pump 1 enters a standby state to achieve the purpose of unloading, the energy consumption is reduced until the pressure of the energy accumulator 4 is lower than the lower limit pressure set by the load-sensitive liquid charging valve 2 again, the load-sensitive liquid charging valve 2 charges the energy accumulator 4 again, and the operation is repeated in this way.

2) When equipment fails, such as a hydraulic power source cannot provide normal power, or a pipeline between the port of the load sensitive prefill valve 2LS and the load sensitive hydraulic pump 1 and the multi-way valve 9 fails, and the load sensitive prefill valve 2 cannot normally charge the accumulator 4, the hydraulic oil pressure of the accumulator 4 is reduced along with the increase of the number of times of operating the brake valve 5 or the increase of the number of times of decelerating and braking by the axle brake 6, when the hydraulic oil pressure of the accumulator 4 is lower than the lower limit pressure set by the load sensitive prefill valve 2, the LS valve bank 2-3 is in the left position to work, but the hydraulic oil in the accumulator 4 can only act on the left end of the LS valve bank 2-3 through the right position of the charge/discharge valve bank 2-2 and cannot flow to other places, so that the leakage of the hydraulic oil in the accumulator 4 is reduced, And loss is caused, the LS valve group 2-3 plays a pressure maintaining role, and driving safety is ensured.

3) The pressure maintaining valve group 2-1 consists of a one-way valve 2-1-1, a filter 2-1-2 and a throttle valve 2-1-3, wherein the one-way valve 2-1-1 plays a role in maintaining pressure of hydraulic oil of the energy accumulator 4 and preventing backflow, the filter 2-1-2 plays a role in keeping the hydraulic oil clean, and the throttle valve 2-1-3 can enable the liquid filling flow of the load sensitive liquid filling valve 2 to be stable within a certain range.

4) The check valve group 2-4 blocks the pressure signal oil output by the load sensitive prefill valve 2, so that the pressure signal oil is prevented from flowing to other leakage points, such as an LS (least squares) port of a load sensitive directional valve 8 through an LS1 port of the load sensitive prefill valve 2, and the energy consumption is reduced; or the pressure signal oil output by the LS port of the load sensitive directional valve 8 is merged to the load sensitive prefill valve 2 and is transmitted to the load sensitive hydraulic pump 1 through the LS port of the load sensitive prefill valve 2 and a related pipeline, so that external connecting parts are reduced.

5) The shuttle valve group 2-5 is applied to a double-loop full hydraulic power braking system, and when one loop has oil leakage and other faults, the other loop can also play a braking role, so that the driving safety is ensured.

6) When the load-sensitive liquid filling valve with the pressure maintaining function is applied to a single-loop full-hydraulic dynamic braking system, the shuttle valve group 2-5 in the technical scheme 6 is cancelled, and the load-sensitive single-path liquid filling valve can be switched.

The hydraulic system process method of the load sensitive liquid charging valve comprises the steps that the load sensitive hydraulic system mainly comprises a load sensitive hydraulic pump 1, a full hydraulic power braking system, a steering system and a working system, wherein the braking system mainly comprises a load sensitive liquid charging valve 2, a parking control system 3, an energy accumulator 4, a braking valve 5 and an axle brake 6, the steering system mainly comprises a load sensitive steering valve 8 and a steering oil cylinder 7, and the working system mainly comprises a multi-way valve 9. The working principle is as follows:

1) when only the steering system works, the load sensitive directional valve 8 outputs pressure signal oil through an LS port on the load sensitive directional valve 8, the output pressure signal oil sequentially passes through an LS1 port of the load sensitive liquid filling valve 2, the one-way valve group 2-4 and an LS port, finally, one part of the pressure signal oil output from the LS port of the load sensitive liquid filling valve 2 acts on the compensation valve 9-2 of the multi-way valve 9 and the load sensitive hydraulic pump 1, and the other part of the pressure signal oil flows back to an oil tank from the flushing valve 9-1 of the multi-way valve 9; the pressure signal oil acting on the compensation valve 9-2 of the multi-way valve 9 and the load sensitive hydraulic pump 1 enables the load sensitive pump 1 to start working and increase the system pressure to supply oil to the steering system.

2) When only the working system works, the multi-way valve 9 directly outputs pressure signal oil through the LS port of the multi-way valve 9 to act on the load sensitive hydraulic pump 1, so that the load sensitive hydraulic pump 1 starts to work, the system pressure is increased, and oil is supplied to the working system.

3) When two or more than two systems work simultaneously, the load sensitive hydraulic system can select the system pressure with the maximum output pressure signal oil to act on the load sensitive hydraulic pump 1, so that the load sensitive hydraulic pump 1 can provide enough pressure and oil quantity to ensure the normal work of the hydraulic system.

4) And when all the hydraulic systems do not work, the pressure signal oil acting on the load sensitive hydraulic pump 1 flows back to the oil tank through the flushing valve 9-1 of the multi-way valve 9, and the load sensitive hydraulic pump 1 enters a standby state, so that the unloading purpose is achieved, and the energy consumption is reduced.

Claims

1. A load sensitive liquid filling valve with a pressure maintaining function comprises a load sensitive hydraulic pump, a load sensitive liquid filling valve, a pressure maintaining valve bank, a liquid filling/unloading valve bank, an LS valve bank, a one-way valve bank, a shuttle valve, a parking control loop, an energy accumulator, a brake valve, an axle brake, a steering oil cylinder, a load sensitive direction valve, a multi-way valve, a flushing valve, a compensation valve, a one-way valve, a filter and a throttle valve, and is characterized in that the load sensitive liquid filling valve (2) comprises a liquid filling/unloading valve bank (2-2), an LS valve bank (2-3), a pressure maintaining valve bank (2-1), a one-way valve bank (2-4) and a shuttle valve (2-5), and the liquid filling/unloading valve bank (2-2) is a two-position three-way valve; the LS valve group (2-3) is a two-position two-way valve; the pressure maintaining valve group (2-1) consists of a one-way valve (2-1-1), a filter (2-1-2) and a throttle valve (2-1-3); the shuttle valve (2-5) is a three-position three-way valve, the load sensitive hydraulic system comprises a full hydraulic power braking system, a steering system and a working system, wherein the full hydraulic power braking system comprises a load sensitive hydraulic pump (1), a load sensitive liquid charging valve (2), a parking control loop (3), an energy accumulator (4), a braking valve (5) and an axle brake (6), the steering system comprises a load sensitive directional valve (8) and a steering cylinder (7), the working system comprises a multi-way valve (9), a flushing valve (9-1) and a compensating valve (9-2), the load sensitive hydraulic pump (1) of the load sensitive liquid charging valve hydraulic system is respectively connected with the load sensitive liquid charging valve (2), the load sensitive directional valve (8) and the multi-way valve (9), the load sensitive directional valve (8) is connected with the steering cylinder (7), the load sensitive liquid charging valve (2) is connected with the energy accumulator (4), an energy accumulator (4) is connected with a brake valve (5), the brake valve (5) is connected with an axle brake (6), return oil of a parking control loop (3) of a load sensitive liquid charging valve (2), a load sensitive hydraulic pump (1) and a multi-way valve (9) flows to a collecting cylinder, a pressure maintaining valve bank (2-1) of the load sensitive liquid charging valve (2) is connected with a Y interface and a shuttle valve (2-5), the load sensitive liquid charging valve bank (2-2) is connected with a liquid charging valve/unloading valve bank (2-2), the liquid charging valve/unloading valve bank (2-2) is connected with an LS valve bank (2-3) and a T interface, the pressure maintaining valve bank (2-1) is connected with a P interface, the pressure maintaining valve bank (2-1) is connected with the LS valve bank (2-3), the LS valve bank (2-3) is connected with an interface LS and a one-way valve bank (2-4), and the shuttle valve (2-5) is connected with an A interface, And the interface B, the interfaces A, B, Y, P, LS1 and T form an oil return system.