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CN-115535926-B - Safe forklift valve control system

CN115535926BCN 115535926 BCN115535926 BCN 115535926BCN-115535926-B

Abstract

The application provides a safe forklift valve control system which comprises a multi-way valve, wherein a descending electromagnetic valve is connected in series to a descending control oil duct of the multi-way valve, an oil inlet electromagnetic valve is connected in series to an oil return duct of the multi-way valve, power ends of the descending electromagnetic valve and the oil inlet electromagnetic valve are electrically connected with a pressure switch arranged on a seat through a relay, and the on-off of an oil way of the descending electromagnetic valve and the oil inlet electromagnetic valve is controlled through the switch of the pressure switch. According to the application, the pressure switch is arranged on the seat to control the on-off of the descending electromagnetic valve and the oil inlet electromagnetic valve in the multi-way valve, so that the forklift is operated, and the operation safety is obviously improved, because once a driver leaves the seat or has incorrect sitting posture, the corresponding valve control rod is operated, and the door frame and the accessory cannot act.

Inventors

  • YU JIANFU
  • CHEN XIUYUN
  • YE FEI
  • ZHAO FEI
  • LIU HAILIN
  • CHEN ZENG
  • MA NING

Assignees

  • 安徽合力股份有限公司

Dates

Publication Date
20260508
Application Date
20221027

Claims (8)

  1. 1. A safe forklift valve control system comprises a multi-way valve (8) and is characterized in that the multi-way valve (8) comprises a lifting reversing valve (8.11) and an inclined reversing valve (8.6), a descending electromagnetic valve (8.8) is connected in series to a descending control oil passage of the multi-way valve (8), one end of the descending electromagnetic valve (8.8) is connected with a working oil port of the lifting reversing valve (8.11) through a first descending control oil passage (8.10), the other end of the descending electromagnetic valve is connected with a lifting oil cylinder (5) through a second descending control oil passage (8.16) through a circular oil passage (8.1), an oil inlet electromagnetic valve (8.3) is connected in series to an oil return passage (8.5) of the multi-way valve (8) through a first unloading oil passage (8.4), one end of the oil inlet electromagnetic valve (8.3) is connected with an oil return passage (8.5) of the multi-way valve through a second unloading oil passage (8.17), and the descending electromagnetic valve (8.8) and the oil inlet electromagnetic valve (8.3) are electrically connected with an oil inlet electromagnetic valve (8.3) through a switch; When a driver sits on the seat correctly, the pressure switch is closed, the descending electromagnetic valve and the oil inlet electromagnetic valve are powered on, the lifting control rod and the inclined control rod in the multi-way valve are operated by the driver to be respectively at a high position and a low position, and the portal frame can lift and descend and incline back and forth so as to drive the accessory to act; When the driver is not sitting on the seat or sitting posture is incorrect, the pressure switch is turned off, the descending electromagnetic valve and the oil inlet electromagnetic valve are powered off, and the lifting control rod and the tilting control rod are operated to be respectively in a high position, a middle position and a low position, so that the portal frame is static, and the accessory does not act.
  2. 2. The forklift valve control system according to claim 1, wherein the multi-way valve (8) comprises a flow dividing valve (8.15) connected with an oil outlet of the oil pump (1), the first oil outlet of the flow dividing valve (8.15) is connected with the steering cylinder (3) through the steering gear (2), and the second oil outlet of the flow dividing valve (8.15) is respectively connected with a lifting reversing valve (8.11), an inclined reversing valve (8.6) and a hydraulic control sliding valve (8.2); Two working oil ports of the lifting reversing valve (8.11) are respectively connected with the hydraulic control one-way valve (8.9) and the descending electromagnetic valve (8.8); the hydraulic control slide valve (8.2) is connected with the oil inlet electromagnetic valve (8.3), and oil return openings of the hydraulic control slide valve (8.2) and the oil inlet electromagnetic valve (8.3) are connected with the oil tank (10).
  3. 3. The forklift valve control system according to claim 2, wherein the hydraulic control one-way valve (8.9) is connected in series between the lifting reversing valve (8.11) and the lifting cylinder (5) of the multi-way valve.
  4. 4. The forklift valve control system according to claim 2, wherein one end of the oil inlet electromagnetic valve (8.3) is connected with the annular oil duct (8.1) through a second unloading oil duct (8.17), the other end of the oil inlet electromagnetic valve is connected with the control slide valve (8.2), and an oil return port of the control slide valve (8.2) is connected with the oil tank (10) through the annular oil duct (8.1).
  5. 5. The forklift valve control system according to claim 2, wherein a first one-way valve (8.7) is connected in series between the diverter valve (8.15) and the inclined reversing valve (8.6).
  6. 6. The forklift valve control system according to claim 2 is characterized in that a speed limiting valve (4) and a cut-off valve (6) are connected between the lifting oil cylinder (5) and the multi-way valve (8), an oil inlet of the oil pump (1) is connected with an oil suction filter (11), and an oil return port of the multi-way valve (8) is connected with an oil return filter (9).
  7. 7. The forklift valve control system according to claim 2, wherein the oil return ports of the lifting reversing valve (8.11) and the tilting reversing valve (8.6) are connected with the oil tank (10) through the oil return duct (8.5) and the annular oil duct (8.1) in sequence.
  8. 8. The forklift valve control system according to claim 1, wherein the descending electromagnetic valve (8.8) is normally open, the oil inlet electromagnetic valve (8.3) is normally closed, and when the pressure switch is turned on, the descending electromagnetic valve (8.8) is electrified to conduct the oil passage, and the oil inlet electromagnetic valve (8.3) is electrified to close the oil passage.

Description

Safe forklift valve control system Technical Field The invention relates to the technical field of forklifts, in particular to a safe forklift valve control system. Background The forklift valve control system is used for controlling the lifting of the portal, the front-back inclination of the portal and the actions of various accessories, namely, a forklift driver controls the lifting, the side movement, the inclination and the like of the forklift by operating a handle on the multi-way valve control mechanism. At present, in the operating device of the fork truck multiway valve, one handle corresponds to one valve plate in the multiway valve, a lifting operating rod is generally adopted to control the lifting of a lifting oil cylinder to realize the lifting action of a portal, and the action of the tilting oil cylinder is controlled through the tilting operating rod to realize the tilting action of the portal. However, in the existing forklift, the door frame and the accessories can be operated only by operating the corresponding valve operating levers, so that the driver cannot pay attention to whether the driver leaves the seat or sits on the seat incorrectly, and if the situation exists, safety problems are caused to the driver, surrounding personnel, the environment and the like. In view of the above, the present invention provides a control method capable of automatically detecting whether a driver leaves a seat and sits on a driver seat in a correct posture, and once the driver leaves the seat or sits incorrectly, the driver can operate a corresponding valve lever, and neither the door frame nor the accessory can operate. Disclosure of Invention The invention aims to provide a safe forklift valve control system which effectively ensures that a driver sits on a seat and can operate actions of a door frame and accessories only when sitting posture is correct, so that safety problems on the driver, surrounding personnel, environment and the like are avoided. In order to achieve the above purpose, the present invention provides the following technical solutions: The utility model provides a safe fork truck valve control system, includes the multiple unit valve, the descending solenoid valve has been concatenated on the control oil duct that descends of multiple unit valve, has concatenated the oil feed solenoid valve on the oil return duct of multiple unit valve, the power end of descending solenoid valve and oil feed solenoid valve all is connected with the pressure switch who installs on the seat through the relay electricity, comes the break-make of control descending solenoid valve and oil feed solenoid valve oil circuit through pressure switch's switch. The multi-way valve comprises a flow dividing valve connected with an oil outlet of the oil pump, wherein the oil outlet of the flow dividing valve I is connected with a steering oil cylinder through a steering gear, and the oil outlet of the flow dividing valve II is respectively connected with a lifting reversing valve, an inclined reversing valve and a hydraulic control slide valve; Two working oil ports of the lifting reversing valve are respectively connected with the hydraulic control one-way valve and the descending electromagnetic valve; The hydraulic control slide valve is connected with the oil inlet electromagnetic valve, and the oil return openings of the hydraulic control slide valve and the oil inlet electromagnetic valve are connected with the oil tank. In a further scheme, one end of the descending electromagnetic valve is connected with a working oil port of the lifting reversing valve through a first descending control oil duct, the other end of the descending electromagnetic valve is connected with the lifting oil cylinder through a second descending control oil duct, and the hydraulic control one-way valve is connected between the lifting reversing valve and the lifting oil cylinder of the multi-way valve in series. In a further scheme, one end of the oil inlet electromagnetic valve is connected with the annular oil duct through a second unloading oil duct, the other end of the oil inlet electromagnetic valve is connected with the slide control valve, and an oil return port of the slide control valve is connected with the oil tank through the annular oil duct. In a further scheme, a first one-way valve is connected in series between the flow dividing valve and the inclined reversing valve. In a further scheme, a speed limiting valve and a cut-off valve are connected between the lifting oil cylinder and the multi-way valve, an oil inlet of the oil pump is connected with an oil suction filter, and an oil return port of the multi-way valve is connected with an oil return filter. In a further scheme, the oil return ports of the lifting reversing valve and the inclined reversing valve are connected with the oil tank through the oil return duct and the annular oil duct in sequence. In a further scheme, the descending electromagnetic va