CN110562884A - Forklift gantry forward-inclination angle control system and control method - Google Patents
Forklift gantry forward-inclination angle control system and control method Download PDFInfo
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- CN110562884A CN110562884A CN201910729147.7A CN201910729147A CN110562884A CN 110562884 A CN110562884 A CN 110562884A CN 201910729147 A CN201910729147 A CN 201910729147A CN 110562884 A CN110562884 A CN 110562884A
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- gantry
- electric controller
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/08—Masts; Guides; Chains
- B66F9/082—Masts; Guides; Chains inclinable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/24—Electrical devices or systems
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
the invention discloses a forklift gantry forward inclination angle control system, which relates to the technical field of forklifts and comprises an electric controller, a gantry height sensor, an inclined oil cylinder displacement sensor, an electromagnetic valve, a motor and an oil pump, wherein the electric controller controls the extension or retraction or the rest of a piston rod of an inclined oil cylinder by controlling the motor and the electromagnetic valve.
Description
Technical Field
the invention belongs to the technical field of forklifts, and particularly relates to a forward-inclination angle control system and a forward-inclination angle control method for a forklift gantry.
background
A common forklift mainly adopts two-stage gantries, the two-stage gantries comprise an inner gantry and an outer gantry, and a fork hung on a fork frame and the fork frame move up and down along the inner gantry together by means of a fork frame roller to drive goods to lift or descend. The inner gantry is driven to lift by a lifting oil cylinder and is also guided by rollers. The two sides behind the door frame are provided with inclined oil cylinders which can enable the door frame to incline forwards or backwards, the inclination angle of the forklift door frame is set for facilitating the loading and unloading of the forklift and the transportation of goods, the forward inclination angle is used for better loading and unloading of goods, and the backward inclination angle ensures that the goods are not easy to fall off during the running of the vehicle.
The inclination angle of the traditional forklift is determined by the extending and retracting limit positions of the inclination oil cylinder, so that the forward-tilting angle of the portal frame is the limit of the stroke of the inclination oil cylinder no matter no load or full load, low goods level or high goods level. The portal is connected with the car body and is a rocker mechanism, so that the goods are lifted more, the goods inclined when the inclined oil cylinder is inclined forwards to limit the limit position are far away from a front wheel supporting point of the forklift, and the center of gravity of the forklift is deviated. When the existing forklift is provided with the gantries with different hoisting heights as required, the inclined oil cylinders are required to be replaced in order to ensure the stability of stacking of the gantries in the high cargo space, so that the forward inclination angle is reduced. However, replacing the tilt cylinder brings about the following disadvantages: on one hand, the inclined oil cylinder needs to be replaced every time, so that the workload is increased, and the inclined oil cylinder is troublesome to replace; on the other hand, when the inclined oil cylinder is replaced to reduce the forward inclination angle, the forward inclination angle of the portal frame is reduced when the goods position is low, and the goods loading and unloading are not facilitated.
Disclosure of Invention
the invention provides a control system and a control method for the forward inclination angle of a forklift mast, which automatically reduce or limit the forward inclination angle of the mast when the lifting height of the mast is increased, thereby realizing that the forward inclination angle of the mast is large when the mast is at a low cargo space and small when the mast is at a high cargo space.
in order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a fork truck portal forward dip angle control system, includes electric controller, installs portal height sensor who is used for measuring portal displacement height value on the portal, installs the slope hydro-cylinder displacement sensor who is used for detecting the piston rod actual displacement value of slope hydro-cylinder on the slope hydro-cylinder, solenoid valve, motor and oil pump, be connected with portal height sensor and slope hydro-cylinder displacement sensor on electric controller's signal input end, be connected with solenoid valve and motor on electric controller's signal output end, motor and oil pump link to each other, the oil absorption mouth of oil pump links to each other with hydraulic tank, and the oil-out of oil pump links to each other with the solenoid valve, the solenoid valve links to each other with the slope hydro-cylinder, the piston rod displacement control value of the slope hydro-cylinder that the height value that portal height sensor detected corresponds is saved in advance in electric controller, and electric controller is worth the piston rod displacement control of the slope hydro-cylinder that And comparing the piston rod displacement control value with the actual piston rod displacement value detected by the tilt cylinder displacement sensor, and controlling the tilt cylinder piston rod to extend or retract or to be static by the electric controller through controlling the motor and the electromagnetic valve according to the comparison result and the received operation command.
Furthermore, the electromagnetic valve is a three-position four-way electromagnetic directional valve, an oil inlet P port of the three-position four-way electromagnetic directional valve is connected with an oil outlet of the oil pump, an oil return port T port of the three-position four-way electromagnetic directional valve is connected with the hydraulic oil tank, a first working oil port A port and a second working oil port B port of the three-position four-way electromagnetic directional valve are respectively connected with a rod cavity and a rodless cavity of the inclined oil cylinder, and a signal output end of the electric controller is respectively connected with an upper electromagnet 1YA and a lower electromagnet 2YA of the three-position four-way electromagnetic directional valve.
Preferably, the hydraulic control system further comprises an overflow valve, an oil outlet of the oil pump is respectively connected with an oil inlet P port of the three-position four-way electromagnetic directional valve and an oil inlet of the overflow valve through a tee joint, and an oil outlet of the overflow valve is connected with the hydraulic oil tank.
the invention also provides a control method based on the forklift mast forward inclination angle control system, which comprises the following steps
(a) starting the forklift, entering the step (b) when the electric controller receives a lifting operation command of the gantry, and entering the step (c) when the electric controller receives a forward tilting operation command of the gantry;
(b) the electric controller compares the received actual displacement value of the piston rod detected by the tilt cylinder displacement sensor with the piston rod displacement control value corresponding to the height value detected by the gantry height sensor, judges whether the actual displacement value of the piston rod detected by the tilt cylinder displacement sensor is larger than the piston rod displacement control value corresponding to the height value detected by the gantry height sensor, if so, enters the step (d), otherwise, enters the step (e);
(c) the electric controller compares the received actual displacement value of the piston rod detected by the tilt cylinder displacement sensor with the piston rod displacement control value corresponding to the height value detected by the gantry height sensor, judges whether the actual displacement value of the piston rod detected by the tilt cylinder displacement sensor is larger than the piston rod displacement control value corresponding to the height value detected by the gantry height sensor, if so, enters the step (f), otherwise, enters the step (g);
(d) the electric controller controls the motor and the upper electromagnet 1YA of the three-position four-way electromagnetic directional valve to be electrified, the motor drives the oil pump to supply oil to an oil inlet P of the three-position four-way electromagnetic directional valve, an oil inlet P port of the three-position four-way electromagnetic directional valve is communicated with a first working oil port A port, hydraulic oil flows into a rod cavity of the inclined oil cylinder through the first working oil port A port of the three-position four-way electromagnetic directional valve, a piston rod of the inclined oil cylinder retracts, and the gantry automatically tilts backwards from a forward tilting position;
(e) The electric controller controls the power-off of the motor and the upper electromagnet 1YA of the three-position four-way electromagnetic reversing valve, and the piston rod of the inclined oil cylinder is static;
(f) The electric controller controls the power-off of the motor and the upper electromagnet 1YA of the three-position four-way electromagnetic reversing valve, and the piston rod of the inclined oil cylinder is static;
(g) The electric controller controls the motor and the lower electromagnet 2YA of the three-position four-way electromagnetic directional valve to be electrified, the motor drives the oil pump to supply oil to an oil inlet P of the three-position four-way electromagnetic directional valve, an oil inlet P port of the three-position four-way electromagnetic directional valve is communicated with a second working oil port B port, hydraulic oil flows into a rodless cavity of the inclined oil cylinder through the second working oil port B port of the three-position four-way electromagnetic directional valve, a piston rod of the inclined oil cylinder extends out, and the gantry automatically tilts forwards from a backward tilting position.
according to the technical scheme, a piston rod displacement control value corresponding to a height value detected by a gantry height sensor is stored in the electric controller in advance, the electric controller obtains the corresponding piston rod displacement control value according to the received height value detected by the gantry height sensor and compares the piston rod displacement control value with an actual displacement value of a piston rod detected by a tilt cylinder displacement sensor, and the electric controller controls the tilt cylinder piston rod to extend or retract or to be static by controlling a motor and an electromagnetic valve according to a comparison result and a received operation command.
drawings
FIG. 1 is a hydraulic control circuit diagram of the present invention;
FIG. 2 is a flow chart of a control method according to the present invention.
the reference numbers illustrate: 10. an electrical controller; 20. a gantry height sensor; 30. a tilt cylinder displacement sensor; 40. an electromagnetic valve; 50. a motor; 60. an oil pump; 70. an overflow valve; C. and (5) inclining the oil cylinder.
Detailed Description
The invention is further illustrated with reference to fig. 1 and 2:
A forklift gantry forward-tilting angle control system comprises an electric controller 10, a gantry height sensor 20 installed on a gantry and used for measuring a gantry displacement height value, an inclined oil cylinder displacement sensor 30 installed on an inclined oil cylinder C and used for detecting an actual displacement value of a piston rod of the inclined oil cylinder C, an electromagnetic valve 40, a motor 50 and an oil pump 60, wherein the gantry height sensor 20 and the inclined oil cylinder displacement sensor 30 are connected to a signal input end of the electric controller 10, the electromagnetic valve 40 and the motor 50 are connected to a signal output end of the electric controller 10, the motor 50 is connected with the oil pump 60, an oil suction port of the oil pump 60 is connected with a hydraulic oil tank, an oil outlet of the oil pump 60 is connected with the electromagnetic valve 40, the electromagnetic valve 40 is connected with the inclined oil cylinder C, and a piston rod displacement control value of the inclined oil cylinder C corresponding to the height value detected by the gantry height sensor 20 is stored in the electric controller, the electrical controller 10 obtains the corresponding piston rod displacement control value of the tilt cylinder C according to the received height value measured by the mast height sensor 20 and compares the piston rod displacement control value with the actual piston rod displacement value detected by the tilt cylinder displacement sensor 30, and the electrical controller 10 controls the extension or retraction or the standstill of the piston rod of the tilt cylinder C by controlling the motor 50 and the solenoid valve 40 according to the comparison result and the received operation command. The electric controller is used for calculating a corresponding piston rod displacement control value according to the received height value measured by the gantry height sensor and comparing the piston rod displacement control value with an actual displacement value of a piston rod detected by the tilt cylinder displacement sensor, the electric controller controls the tilt cylinder piston rod to extend or retract or to be static by controlling the motor and the electromagnetic valve according to a comparison result and a received operation command, and the angle of the gantry is automatically reduced or limited when the gantry rises and rises to increase through controlling the tilt cylinder piston rod, so that the forward inclination angle is large when the gantry is at a low goods level and the forward inclination angle is small when the gantry is at a high goods level.
Further, the electromagnetic valve 40 is a three-position four-way electromagnetic directional valve, an oil inlet P of the three-position four-way electromagnetic directional valve is connected with an oil outlet of the oil pump 60, an oil return port T of the three-position four-way electromagnetic directional valve is connected with the hydraulic oil tank, a first working oil port a and a second working oil port B of the three-position four-way electromagnetic directional valve are respectively connected with a rod cavity and a rodless cavity of the inclined oil cylinder, and a signal output end of the electric controller 10 is respectively connected with an upper electromagnet 1YA and a lower electromagnet 2YA of the three-position four-way electromagnetic directional valve. The electric controller 10 controls the upper electromagnet 1YA of the three-position four-way electromagnetic reversing valve to be electrified, so that an oil inlet P port of the three-position four-way electromagnetic reversing valve is communicated with a first working oil port A, and an oil return port T is communicated with a second working oil port B; the electric controller 10 controls the lower electromagnet 2YA of the three-position four-way electromagnetic directional valve to be electrified, an oil inlet P port of the three-position four-way electromagnetic directional valve is communicated with a second working oil port B port, and an oil return port T port is communicated with a first working oil port A port.
Preferably, the hydraulic control system further comprises an overflow valve 70, an oil outlet of the oil pump 60 is respectively connected with an oil inlet P port of the three-position four-way electromagnetic directional valve and an oil inlet of the overflow valve 70 through a tee joint, and an oil outlet of the overflow valve 70 is connected with the hydraulic oil tank. The overflow valve 70 is used as pressure relief protection, so that the outlet pressure of the oil pump 60 can be ensured to be constant.
A method for controlling the forward inclination angle of a forklift mast comprises the following steps
(a) starting the forklift, entering the step (b) when the electric controller 10 receives a lifting operation command of the gantry, and entering the step (c) when the electric controller 10 receives a forward tilting operation command of the gantry;
(b) the electric controller 10 compares the received actual displacement value of the piston rod detected by the tilt cylinder displacement sensor 30 with the piston rod displacement control value corresponding to the height value detected by the gantry height sensor 20, and judges whether the actual displacement value of the piston rod detected by the tilt cylinder displacement sensor 30 is greater than the piston rod displacement control value corresponding to the height value detected by the gantry height sensor 20, if so, the step (d) is performed, otherwise, the step (e) is performed;
(c) The electric controller 10 compares the received actual displacement value of the piston rod detected by the tilt cylinder displacement sensor 30 with the piston rod displacement control value corresponding to the height value detected by the gantry height sensor 20, and judges whether the actual displacement value of the piston rod detected by the tilt cylinder displacement sensor 30 is greater than the piston rod displacement control value corresponding to the height value detected by the gantry height sensor 20, if so, the step (f) is performed, otherwise, the step (g) is performed;
(d) The electric controller 10 controls the motor 50 and the upper electromagnet 1YA of the three-position four-way electromagnetic directional valve to be electrified, the motor 50 drives the oil pump 60 to supply oil to an oil inlet P of the three-position four-way electromagnetic directional valve, an oil inlet P port of the three-position four-way electromagnetic directional valve is communicated with a first working oil port A port, hydraulic oil flows into a rod cavity of the inclined oil cylinder C through the first working oil port A port of the three-position four-way electromagnetic directional valve, a piston rod of the inclined oil cylinder C retracts, and the gantry automatically tilts backwards from a forward tilting position;
(e) The electric controller 10 controls the power-off of the motor 50 and the upper electromagnet 1YA of the three-position four-way electromagnetic reversing valve, and the piston rod of the tilting oil cylinder C is static;
(f) The electric controller 10 controls the power-off of the motor 50 and the upper electromagnet 1YA of the three-position four-way electromagnetic reversing valve, and the piston rod of the tilting oil cylinder C is static;
(g) The electric controller 10 controls the motor 50 and the lower electromagnet 2YA of the three-position four-way electromagnetic directional valve to be electrified, the motor 50 drives the oil pump 60 to supply oil to an oil inlet P of the three-position four-way electromagnetic directional valve, an oil inlet P port of the three-position four-way electromagnetic directional valve is communicated with a second working oil port B port, hydraulic oil flows into a rodless cavity of the inclined oil cylinder C through the second working oil port B port of the three-position four-way electromagnetic directional valve, a piston rod of the inclined oil cylinder C extends out, and the gantry automatically tilts forwards from a backward tilting position.
when the portal is at a low cargo level, in order to load and unload cargos, the forward inclination angle of the portal needs to be larger, so that the portal needs to be operated forwards, and when the electric controller 10 judges that the actual displacement value of the piston rod detected by the inclined oil cylinder displacement sensor 30 is larger than the piston rod displacement control value corresponding to the height value detected by the portal height sensor 20, the forward inclination angle of the portal at the moment is larger than the preset forward inclination angle, so that the requirement of loading and unloading cargos when the portal is at the low cargo level is met, and the piston rod of the inclined oil cylinder C is static; otherwise, it is indicated that the forward inclination angle of the gantry is smaller than the preset forward inclination angle, so that the piston rod of the tilt cylinder C extends out, the gantry automatically tilts forward from the backward inclination position until the actual displacement value of the piston rod received by the electric controller 10 is equal to the piston rod displacement control value, that is, the forward inclination angle of the gantry is equal to the preset forward inclination angle, and the piston rod of the tilt cylinder C stops moving.
When the portal frame is positioned at a high cargo space, in order to avoid the shift of the gravity center caused by the larger forward inclination angle of the portal frame and ensure the stacking stability of the portal frame, the forward inclination angle of the portal frame needs to be controlled in a smaller range, so in the lifting operation of the portal frame, when the electric controller 10 judges that the actual displacement value of the piston rod detected by the tilt cylinder displacement sensor 30 is larger than the piston rod displacement control value corresponding to the height value detected by the gantry height sensor 20, which indicates that the forward inclination angle of the gantry at the moment is larger than the preset forward inclination angle, the forward inclination angle of the gantry needs to be reduced, therefore, the piston rod of the tilting oil cylinder C retracts, the gantry automatically tilts backwards from the forward tilting position until the actual displacement value of the piston rod received by the electric controller 10 is equal to the displacement control value of the piston rod, namely, the front inclination angle of the gantry at the moment is equal to the preset front inclination angle, and the piston rod of the tilting oil cylinder C stops acting; otherwise, the forward inclination angle of the gantry is smaller than the preset forward inclination angle, so that the requirement of gantry stacking stability is met, and the piston rod of the inclined oil cylinder C is static.
Claims (4)
1. The utility model provides a fork truck portal forward dip angle control system which characterized in that: the device comprises an electric controller (10), a gantry height sensor (20) arranged on a gantry and used for measuring a gantry displacement height value, an inclined oil cylinder displacement sensor (30) arranged on an inclined oil cylinder C and used for detecting an actual displacement value of a piston rod of the inclined oil cylinder C, an electromagnetic valve (40), a motor (50) and an oil pump (60), wherein the gantry height sensor (20) and the inclined oil cylinder displacement sensor (30) are connected to a signal input end of the electric controller (10), the electromagnetic valve (40) and the motor (50) are connected to a signal output end of the electric controller (10), the motor (50) and the oil pump (60) are connected, an oil suction port of the oil pump (60) is connected with a hydraulic oil tank, an oil outlet of the oil pump (60) is connected with the electromagnetic valve (40), the electromagnetic valve (40) is connected with the inclined oil cylinder C, and the electric controller (10) is stored with the activity of the inclined oil cylinder C corresponding to the height value detected by the gantry And a piston rod displacement control value, wherein the electric controller (10) obtains a corresponding piston rod displacement control value of the tilt cylinder C according to the received height value measured by the gantry height sensor (20) and compares the piston rod displacement control value with an actual displacement value of the piston rod detected by the tilt cylinder displacement sensor (30), and the electric controller (10) controls the extension or retraction or the rest of the piston rod of the tilt cylinder C through controlling the motor (50) and the electromagnetic valve (40) according to the comparison result and the received operation command.
2. The forklift mast forward rake angle control system of claim 1, wherein: the electromagnetic valve (40) is a three-position four-way electromagnetic reversing valve, an oil inlet P port of the three-position four-way electromagnetic reversing valve is connected with an oil outlet of an oil pump (60), an oil return port T port of the three-position four-way electromagnetic reversing valve is connected with a hydraulic oil tank, a first working oil port A port and a second working oil port B port of the three-position four-way electromagnetic reversing valve are respectively connected with a rod cavity and a rodless cavity of the inclined oil cylinder, and a signal output end of the electric controller (10) is respectively connected with an upper electromagnet 1YA and a lower electromagnet 2YA of the three-position four-way electromagnetic reversing valve.
3. The forklift mast forward rake angle control system according to claim 1 or 2, characterized in that: the hydraulic control system is characterized by further comprising an overflow valve (70), wherein an oil outlet of the oil pump (60) is connected with an oil inlet P port of the three-position four-way electromagnetic directional valve and an oil inlet of the overflow valve (70) through a tee joint respectively, and an oil outlet of the overflow valve (70) is connected with a hydraulic oil tank.
4. a method for controlling the forward inclination angle of a forklift gantry is characterized by comprising the following steps: the method comprises the following steps:
(a) starting the forklift, entering the step (b) when the electric controller (10) receives a lifting operation command of the gantry, and entering the step (c) when the electric controller (10) receives a forward tilting operation command of the gantry;
(b) The electric controller (10) compares the received actual displacement value of the piston rod detected by the tilt cylinder displacement sensor (30) with the piston rod displacement control value corresponding to the height value detected by the gantry height sensor (20), judges whether the actual displacement value of the piston rod detected by the tilt cylinder displacement sensor (30) is larger than the piston rod displacement control value corresponding to the height value detected by the gantry height sensor (20), if so, the step (d) is carried out, otherwise, the step (e) is carried out;
(c) The electric controller (10) compares the received actual displacement value of the piston rod detected by the tilt cylinder displacement sensor (30) with the piston rod displacement control value corresponding to the height value detected by the gantry height sensor (20), judges whether the actual displacement value of the piston rod detected by the tilt cylinder displacement sensor (30) is larger than the piston rod displacement control value corresponding to the height value detected by the gantry height sensor (20), if so, enters the step (f), otherwise, enters the step (g);
(d) The electric controller (10) controls the motor (50) and the upper electromagnet 1YA of the three-position four-way electromagnetic directional valve to be electrified, the motor (50) drives the oil pump (60) to supply oil to an oil inlet P of the three-position four-way electromagnetic directional valve, an oil inlet P port of the three-position four-way electromagnetic directional valve is communicated with a first working oil port A port, hydraulic oil flows into a rod cavity of the inclined oil cylinder C through the first working oil port A port of the three-position four-way electromagnetic directional valve, a piston rod of the inclined oil cylinder C retracts, and the gantry automatically tilts backwards from a forward tilting position;
(e) The electric controller (10) controls the power-off of the motor (50) and the upper electromagnet 1YA of the three-position four-way electromagnetic reversing valve, and the piston rod of the tilting oil cylinder C is static;
(f) The electric controller (10) controls the power-off of the motor (50) and the upper electromagnet 1YA of the three-position four-way electromagnetic reversing valve, and the piston rod of the tilting oil cylinder C is static;
(g) The electric controller (10) controls the motor (50) and the lower electromagnet 2YA of the three-position four-way electromagnetic directional valve to be electrified, the motor (50) drives the oil pump (60) to supply oil to an oil inlet P of the three-position four-way electromagnetic directional valve, an oil inlet P port of the three-position four-way electromagnetic directional valve is communicated with a second working oil port B port, hydraulic oil flows into a rodless cavity of the inclined oil cylinder C through the second working oil port B port of the three-position four-way electromagnetic directional valve, a piston rod of the inclined oil cylinder C extends out, and the gantry automatically tilts forwards from a backward tilting position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910729147.7A CN110562884B (en) | 2019-08-08 | 2019-08-08 | Forklift gantry forward-inclination angle control system and control method |
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| CN201910729147.7A CN110562884B (en) | 2019-08-08 | 2019-08-08 | Forklift gantry forward-inclination angle control system and control method |
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| CN110562884A true CN110562884A (en) | 2019-12-13 |
| CN110562884B CN110562884B (en) | 2020-11-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557012A (en) * | 2020-12-10 | 2021-03-26 | 中国包装科研测试中心 | Automatic detection system applied to tray fatigue test and test method thereof |
| CN112591669A (en) * | 2021-01-15 | 2021-04-02 | 南通皋标建筑劳务有限公司 | Forklift truck |
| FR3114312A1 (en) | 2020-09-18 | 2022-03-25 | Lre Solution | Accessory for pallet truck |
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| CN112557012A (en) * | 2020-12-10 | 2021-03-26 | 中国包装科研测试中心 | Automatic detection system applied to tray fatigue test and test method thereof |
| CN112557012B (en) * | 2020-12-10 | 2023-03-07 | 中国包装科研测试中心 | Automatic detection system applied to tray fatigue test and test method thereof |
| CN112591669A (en) * | 2021-01-15 | 2021-04-02 | 南通皋标建筑劳务有限公司 | Forklift truck |
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