CN108529510B - Full-proportion control hydraulic system of forward forklift attachment - Google Patents
Full-proportion control hydraulic system of forward forklift attachment Download PDFInfo
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- CN108529510B CN108529510B CN201810586644.1A CN201810586644A CN108529510B CN 108529510 B CN108529510 B CN 108529510B CN 201810586644 A CN201810586644 A CN 201810586644A CN 108529510 B CN108529510 B CN 108529510B
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- 239000003921 oil Substances 0.000 claims description 195
- 239000010720 hydraulic oil Substances 0.000 claims description 12
- 239000010729 system oil Substances 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a full-proportion control hydraulic system of an advancing forklift attachment, which comprises an advancing oil cylinder, an inclined oil cylinder, a side shifting oil cylinder and a three-position four-way electromagnetic proportion reversing valve, wherein an oil inlet and an oil return opening of the three-position four-way electromagnetic proportion reversing valve are respectively connected with an oil way of the hydraulic system, and working oil ports of the three-position four-way electromagnetic proportion reversing valve are respectively connected with the advancing oil cylinder, the inclined oil cylinder and the side shifting oil cylinder in a one-to-one correspondence manner through a two-position four-way electromagnetic reversing valve to form respective hydraulic loops. The invention adopts a three-position four-way electromagnetic proportional reversing valve and three two-position four-way electromagnetic reversing valves to realize the full proportional control of the forward fork truck accessory, and the cost is far lower than the cost of using the three-position four-way electromagnetic proportional reversing valves; and only two proportional quantity inputs are needed, so that the number of analog quantity output ports of an electric control system can be reduced, and the cost is further reduced.
Description
Technical Field
The invention belongs to a forklift hydraulic system, and particularly relates to a full-scale control hydraulic system of a forward forklift attachment.
Background
The forward fork truck attachment generally has three functions of fork frame forward and backward movement, fork inclination and fork lateral movement, and the precision of each action can be better controlled by adopting proportional valve control, so that the proportional valve is also widely applied to fork truck hydraulic systems. The principle of the hydraulic system for controlling the proportion of the accessory adopted in the prior art is shown in figure 1, each execution action is controlled through a corresponding three-position four-way electromagnetic proportional reversing valve, but the three-position four-way electromagnetic proportional reversing valve has higher cost, three-position four-way electromagnetic proportional reversing valves are required to be used for corresponding three functions, and six proportional quantity inputs are added in total, so that the hydraulic system for controlling the whole proportion of the accessory has higher cost and is unfavorable for market popularization.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a full-proportion control hydraulic system of a forward forklift attachment, which reduces the cost of the hydraulic system on the basis of not changing proportion control, thereby improving the market competitiveness of products.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the full-proportion control hydraulic system of the forward fork truck accessory comprises a forward cylinder, an inclined cylinder, a side-shifting cylinder and a three-position four-way electromagnetic proportional reversing valve, wherein an oil inlet and an oil return opening of the three-position four-way electromagnetic proportional reversing valve are respectively connected with an oil way of the hydraulic system, and working oil ports of the three-position four-way electromagnetic proportional reversing valve are respectively connected with the forward cylinder, the inclined cylinder and the side-shifting cylinder in a one-to-one correspondence manner through a two-position four-way electromagnetic reversing valve to form respective hydraulic loops.
Further, a first working oil port of the four-way electromagnetic proportional reversing valve is respectively connected with an oil inlet P2 port of the first two-way electromagnetic reversing valve and an oil inlet end of a third three-way pipe through a first three-way pipe, and an output end of the third three-way pipe is respectively connected with an oil inlet P3 of the second two-way electromagnetic reversing valve and an oil inlet P4 of the third two-way electromagnetic reversing valve; the second working oil port of the three-position four-way electromagnetic proportional reversing valve is respectively connected with the oil inlet T2 port of the first two-position four-way electromagnetic reversing valve and the oil inlet end of the fourth three-way pipe through a second three-way pipe, and the output end of the fourth three-way pipe is respectively connected with the oil return port T3 of the second two-position four-way electromagnetic reversing valve and the oil return port T4 of the third two-position four-way electromagnetic reversing valve.
In a further scheme, two working oil ports of the first two-position four-way electromagnetic reversing valve are respectively connected with a rodless cavity and a rod cavity of the forward moving oil cylinder; two working oil ports of the second two-position four-way electromagnetic reversing valve are respectively connected with a rodless cavity and a rod cavity of the inclined oil cylinder; the side-shifting oil cylinder comprises a left side-shifting oil cylinder and a right side-shifting oil cylinder, two working oil ports of the third two-position four-way electromagnetic reversing valve are respectively connected with rodless cavities of the left side-shifting oil cylinder and the right side-shifting oil cylinder, and a rod cavity of the left side-shifting oil cylinder is communicated with a rod cavity of the right side-shifting oil cylinder.
The invention adopts a three-position four-way electromagnetic proportional reversing valve and three two-position four-way electromagnetic reversing valves to realize the full proportional control of the forward fork truck accessory, and the cost is far lower than the cost of using the three-position four-way electromagnetic proportional reversing valves; the price of a single 8-path three-position four-way electromagnetic proportional reversing valve in the market is 1500 yuan, and the price of a single 8-path two-position four-way electromagnetic proportional reversing valve adopting the scheme of the invention is 200 yuan, and the scheme cost of the scheme of the invention is about 2100 yuan, so that the cost of 2400 yuan/station can be saved only on the electromagnetic valve by adopting the scheme of the invention.
And only two proportional quantity inputs are needed, namely the oil quantity is controlled by the current of the proportional electromagnets at the two ends of the three-position four-way electromagnetic proportional reversing valve, so that the moving speeds of the forward moving oil cylinder, the inclined oil cylinder and the side moving oil cylinder are respectively adjusted, the number of analog quantity output ports of an electric control system can be reduced, and the cost can be further reduced.
Wherein: the three-position four-way electromagnetic proportional reversing valve is provided with three working positions, when a Y1 proportional electromagnet of the three-position four-way electromagnetic proportional reversing valve is electrified and a Y2 proportional electromagnet is powered off, the valve works at the left position, at the moment, an oil inlet P port of the valve is communicated with a first working oil port A, a second working oil port B is communicated with a T port, the Y1 proportional electromagnet can control the current through an electric control system so as to change the opening sizes of the P port and the first working oil port A and the opening sizes of the second working oil port B and the T port, so that the flow entering an execution oil cylinder is controlled, and the action speed of the oil cylinder is controlled closely; when the Y1 proportion electromagnet is powered off and the Y2 proportion electromagnet is powered on, the working is in the right position, at the moment, the oil inlet P port of the Y2 proportion electromagnet is communicated with the second working oil port B, the first working oil port A is communicated with the T port, the Y2 proportion electromagnet can also control the current through an electric control system so as to change the opening sizes of the P port and the second working oil port B and the opening sizes of the first working oil port A and the T port, thereby controlling the flow entering the execution oil cylinder and nearly controlling the action speed of the oil cylinder; when both the two proportion electromagnets are powered off, the three-position four-way electromagnetic proportion reversing valve is in a neutral position, and all oil ports of the three-position four-way electromagnetic proportion reversing valve are in a disconnected state.
The three two-position four-way electromagnetic reversing valves are provided with two working positions, the first two-position four-way electromagnetic reversing valve is taken as an example, when the electromagnet Y3 is electrified, the electromagnetic reversing valve works at the left position, at the moment, the oil inlet P2 port of the electromagnetic reversing valve is communicated with the first working oil port A2 port, and the second working oil port B2 port is communicated with the oil return port T2; when the electromagnet Y3 is powered off, the valve works at the right position, and all oil ports of the two-position four-way electromagnetic reversing valve are in a disconnected state.
Drawings
Figure 1 is a schematic diagram of a prior art hydraulic system,
Fig. 2 is a schematic diagram of the hydraulic system of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
As shown in fig. 2, the full-proportion control hydraulic system of the forward fork truck attachment comprises a forward cylinder 5, an inclined cylinder 6, a side-shifting cylinder and a three-position four-way electromagnetic proportional reversing valve 1, wherein an oil inlet and an oil return opening of the three-position four-way electromagnetic proportional reversing valve 1 are respectively connected with an oil way of a hydraulic system, and working oil ports of the three-position four-way electromagnetic proportional reversing valve 1 are respectively connected with the forward cylinder 5, the inclined cylinder 6 and the side-shifting cylinder in a one-to-one correspondence manner through a two-position four-way electromagnetic reversing valve to form respective hydraulic loops.
Further, a first working oil port A of the four-way electromagnetic proportional reversing valve 1 is respectively connected with an oil inlet P2 port of the first two-way four-way electromagnetic reversing valve 2 and an oil inlet end of a third three-way pipe 11 through a first three-way pipe 9, and an output end of the third three-way pipe 11 is respectively connected with an oil inlet P3 of the second two-way four-way electromagnetic reversing valve 3 and an oil inlet P4 of the third two-way four-way electromagnetic reversing valve 4; the second working oil port B of the three-position four-way electromagnetic proportional reversing valve 1 is respectively connected with the oil inlet T2 port of the first two-position four-way electromagnetic reversing valve 2 and the oil inlet end of the fourth three-way pipe 12 through a second three-way pipe 10, and the output end of the fourth three-way pipe 12 is respectively connected with the oil return port T3 of the second two-position four-way electromagnetic reversing valve 3 and the oil return port T4 of the third two-position four-way electromagnetic reversing valve 4.
In a further scheme, two working oil ports of the first two-position four-way electromagnetic reversing valve 2 are respectively connected with a rodless cavity and a rod cavity of the forward moving oil cylinder 5; two working oil ports of the second two-position four-way electromagnetic reversing valve 3 are respectively connected with a rodless cavity and a rod cavity of the inclined oil cylinder 6; the side-shifting oil cylinder comprises a left side-shifting oil cylinder 7 and a right side-shifting oil cylinder 8, two working oil ports of the third two-position four-way electromagnetic reversing valve 4 are respectively connected with rodless cavities of the left side-shifting oil cylinder 7 and the right side-shifting oil cylinder 8, and a rod cavity of the left side-shifting oil cylinder 7 is communicated with a rod cavity of the right side-shifting oil cylinder 8.
When forward movement is executed, the Y1 proportion electromagnet of the three-position four-way electromagnetic proportion reversing valve 1 is electrified, the Y3 electromagnet of the first two-position four-way electromagnetic proportion reversing valve 2 is electrified, hydraulic oil from a system oil supply path is communicated with an oil return path of a hydraulic system through an oil inlet P port and a first working oil port A port of the three-position four-way electromagnetic proportion reversing valve 1, enters a rodless cavity of the forward movement oil cylinder 5 through a first three-way pipe 9, an oil inlet P2 port and a first working oil port A2 port of the first two-position four-way electromagnetic proportion reversing valve 2, pushes a piston rod of the forward movement oil cylinder 5 to extend out, rod cavity oil return of the forward movement oil cylinder 5 sequentially passes through a second working oil port B2 port and an oil return port T2 port of the first two-position four-way electromagnetic proportion reversing valve 2, a second three-way pipe 10, and a second working oil port B port of the three-position four-way electromagnetic proportion reversing valve 1 are communicated with an oil return path of the hydraulic system, and when forward movement speed needs to be adjusted, the flow of the Y1 proportion electromagnet of the three-position four-way electromagnetic proportion reversing valve 1 is controlled through an electronic control system, so that forward movement speed adjustment is realized; when the back moving operation is executed, the Y2 proportion electromagnet of the three-position four-way electromagnetic proportion reversing valve 1 is electrified, the Y3 electromagnet of the first two-position four-way electromagnetic proportion reversing valve 2 is electrified, hydraulic oil from a system oil supply path is communicated with an oil return path of a hydraulic system through an oil inlet P port and a second working port B port of the three-position four-way electromagnetic proportion reversing valve 1, enters a rod cavity of the forward moving oil cylinder 5 through a second three-way pipe 10, an oil return port T2 port and a second working port B2 port of the first two-position four-way electromagnetic proportion reversing valve 2, pushes a piston rod of the forward moving oil cylinder 5 to retract, and returns oil through a rodless cavity of the forward moving oil cylinder 5 sequentially through a first working port A2 port and an oil inlet P2 port of the first two-position four-way electromagnetic proportion reversing valve 2, a first three-way pipe 9 and a first working port A port and an oil return port T port of the three-position four-way electromagnetic proportion reversing valve 1 are communicated with an oil return path of the hydraulic system, and when the back moving speed needs to be adjusted, the flow of the Y2 proportion electromagnet of the three-position four-way electromagnetic proportion reversing valve 1 is controlled through an electronic control system to change the flow through the three-position electromagnetic proportion reversing valve 1, so that the back moving speed is adjusted.
When the backward tilting action is executed, the Y1 proportion electromagnet of the three-position four-way electromagnetic proportion reversing valve 1 is electrified, the Y4 electromagnet of the second two-position four-way electromagnetic proportion reversing valve 3 is electrified, hydraulic oil from a system oil supply passage is communicated with an oil return passage of a hydraulic system through an oil inlet P port and a first working oil port A port of the three-position four-way electromagnetic proportion reversing valve 1, enters a rodless cavity of the tilting cylinder 6 through a first three-way pipe 9, a third three-way pipe 11 and an oil inlet P3 port and a first working oil port A3 port of the second two-position four-way electromagnetic proportion reversing valve 3, pushes a piston rod of the tilting cylinder 6 to extend, oil return of a rod cavity of the tilting cylinder 6 sequentially passes through a second working oil port B3 port and an oil return port T3 port of the second two-position four-way electromagnetic proportion reversing valve 3, and a fourth three-way pipe 12 and a second three-way pipe 10, and the second working oil port B port T port of the three-position four-way electromagnetic proportion reversing valve 1 is communicated with an oil return passage of the hydraulic system, and when the backward tilting speed needs to be adjusted, the electric control system controls the electrifying current of the Y1 proportion electromagnet of the three-position four-way electromagnetic proportion reversing valve 1, so that the backward tilting speed is changed through the electric control system, and the flow of the three-position four-way electromagnetic proportion reversing valve 1 is adjusted; when the forward tilting action is executed, the Y2 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve 1 is electrified, the Y4 electromagnet of the second two-position four-way electromagnetic proportional reversing valve 3 is electrified, hydraulic oil from a system oil supply path is communicated with an oil return path of a hydraulic system through an oil inlet P port and a second working oil port B port of the three-position four-way electromagnetic proportional reversing valve 1, an oil return port T3 port and a second working oil port B3 port of the second two-position four-way electromagnetic proportional reversing valve 3 enter a rod cavity of the tilting cylinder 6, a piston rod of the tilting cylinder 6 is pushed to retract, rodless cavity oil return of the tilting cylinder 6 sequentially passes through a first working oil port A3 port and an oil inlet P3 port of the second two-position four-way electromagnetic proportional reversing valve 3, a third three-way pipe 11, a first three-way pipe 9 and a first working oil port A port and an oil return port T port of the three-position four-way electromagnetic proportional reversing valve 1 are communicated with an oil return path of the hydraulic system, and when the tilting speed of the three-position four-way electromagnetic proportional reversing valve 1 needs to be adjusted, the electric control system is used for controlling the Y2 proportion electromagnet electrifying current of the three-position four-way electromagnetic proportional reversing valve 1, so that the flow through the three-position four-way electromagnetic proportional reversing valve 1 is changed, and the tilting speed of the tilting speed is adjusted.
When the left side movement is executed, the Y1 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve 1 is electrified, the Y5 electromagnet of the third two-position four-way electromagnetic reversing valve 4 is electrified, hydraulic oil from a system oil supply passage passes through the oil inlet P port and the first working oil port A port of the three-position four-way electromagnetic proportional reversing valve 1, enters the rodless cavity of the left side shifting oil cylinder 7 through the first three-way pipe 9, the third three-way pipe 11 and the oil inlet P4 port and the first working oil port A4 port of the third two-position four-way electromagnetic proportional reversing valve 4, pushes the piston rod of the left side shifting oil cylinder 7 to extend, the rod cavity oil return of the left side shifting oil cylinder 7 enters the rod cavity of the right side shifting oil cylinder 8, pushes the piston rod of the right side shifting oil cylinder 8 to retract, the rodless cavity oil return of the right side shifting oil cylinder 8 sequentially passes through the second working oil port B4 port and the oil return port T4 port of the third two-position four-way electromagnetic reversing valve 4, the fourth three-way pipe 12 and the second three-way pipe 10 and the second working oil port B port and the oil return port T port of the three-position four-way electromagnetic proportional reversing valve 1 are communicated with the oil return passage of a hydraulic system, and when the left side speed needs to be adjusted, the electric control system controls the three-position four-way electromagnetic proportional reversing valve 1 to change the current flow through the Y1 proportion electromagnet to change the current through the electromagnetic proportional reversing valve 1.
When the right side shifting action is executed, the Y2 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve 1 is electrified, the Y5 electromagnet of the third two-position four-way electromagnetic reversing valve 4 is electrified, hydraulic oil from a system oil supply passage passes through the oil inlet P port and the second working oil port B port of the three-position four-way electromagnetic proportional reversing valve 1, the oil return port T4 port and the second working oil port B4 port of the third two-way electromagnetic reversing valve 4 enter the rodless cavity of the right side shifting oil cylinder 8, the piston rod of the right side shifting oil cylinder 8 is pushed to extend, the rod cavity oil return of the left side shifting oil cylinder 7 enters the rod cavity of the left side shifting oil cylinder 7, the piston rod of the left side shifting oil cylinder 7 is pushed to retract, the oil return oil in the rodless cavity oil return of the left side shifting oil cylinder 7 sequentially passes through the first working oil port A4 port and the oil inlet P4 port of the third two-position four-way electromagnetic reversing valve 4, the third three-way pipe 11, the first three-way pipe 9 and the first working oil port A port and the oil return port T port of the three-position four-way electromagnetic proportional reversing valve 1 are communicated with the oil return passage of a hydraulic system, and when the right side shifting speed is required to be adjusted, the electric control current flow rate of the four-way electromagnetic proportional reversing valve 1 is controlled by the system, and the electronic control valve 2 is controlled by the four-way electromagnetic proportional reversing valve 1, and the electronic control valve is changed.
Furthermore, the embodiments and drawings presented in this specification are only preferred examples for the purpose of illustrating the invention and are not intended to limit the scope of the invention, and it is therefore understood that other equivalents and modifications may be made without departing from the spirit and scope of the invention, and are within the scope of the invention.
Claims (2)
1. The utility model provides a full proportional control hydraulic system of forward fork truck accessory, includes forward cylinder (5), tilt cylinder (6), side shift cylinder and three four-way electromagnetic proportional reversing valve (1), its characterized in that: the oil inlet and the oil return port of the three-position four-way electromagnetic proportional reversing valve (1) are respectively connected with an oil way of a hydraulic system, and the working oil ports of the three-position four-way electromagnetic proportional reversing valve (1) are respectively connected with the forward moving oil cylinder (5), the inclined oil cylinder (6) and the side moving oil cylinder in a one-to-one correspondence manner through a two-position four-way electromagnetic reversing valve to form respective hydraulic loops;
The first working oil port of the four-way electromagnetic proportional reversing valve (1) is respectively connected with an oil inlet P2 port of the first two-way four-way electromagnetic reversing valve (2) and an oil inlet end of a third three-way pipe (11) through a first three-way pipe (9), and an output end of the third three-way pipe (11) is respectively connected with an oil inlet P3 of the second two-way four-way electromagnetic reversing valve (3) and an oil inlet P4 of the third two-way four-way electromagnetic reversing valve (4); the second working oil port of the three-position four-way electromagnetic proportional reversing valve (1) is respectively connected with an oil inlet T2 port of the first two-position four-way electromagnetic reversing valve (2) and an oil inlet end of a fourth three-way pipe (12) through a second three-way pipe (10), and an output end of the fourth three-way pipe (12) is respectively connected with an oil return port T3 of the second two-position four-way electromagnetic reversing valve (3) and an oil return port T4 of the third two-position four-way electromagnetic reversing valve (4);
The moving speeds of the forward moving oil cylinder, the inclined oil cylinder and the side moving oil cylinder are respectively adjusted by controlling the current of the proportional electromagnets at the two ends of the three-position four-way electromagnetic proportional reversing valve (1);
the method for controlling the forward forklift attachment by the full-proportion control hydraulic system comprises the following steps:
when the forward motion is executed, a Y1 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve (1) is electrified, a Y3 electromagnet of the first two-position four-way electromagnetic reversing valve (2) is electrified, and hydraulic oil from a system oil supply path enters the forward motion oil cylinder (5) through the three-position four-way electromagnetic proportional reversing valve (1), the first three-way pipe (9) and the first two-position four-way electromagnetic reversing valve (2) to push a piston rod to extend;
When the rear movement operation is executed, a Y2 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve (1) is electrified, a Y3 electromagnet of the first two-position four-way electromagnetic reversing valve (2) is electrified, and hydraulic oil from a system oil supply path enters an advancing oil cylinder (5) through the three-position four-way electromagnetic proportional reversing valve (1), a second three-way pipe (10) and the first two-position four-way electromagnetic reversing valve (2) to push a piston rod to retract;
When the backward tilting action is executed, a Y1 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve (1) is electrified, a Y4 electromagnet of the second two-position four-way electromagnetic reversing valve (3) is electrified, and hydraulic oil from a system oil supply path enters an inclined oil cylinder (6) through the three-position four-way electromagnetic proportional reversing valve (1), the first three-way pipe (9), the third three-way pipe (11) and the second two-position four-way electromagnetic reversing valve (3) to push a piston rod to extend;
When forward tilting is executed, a Y2 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve (1) is electrified, a Y4 electromagnet of the second two-position four-way electromagnetic reversing valve (3) is electrified, hydraulic oil from a system oil supply path enters a rod cavity of the tilting oil cylinder (6) through the three-position four-way electromagnetic proportional reversing valve (1), the second three-way pipe 10, the fourth three-way pipe (12) and the second two-position four-way electromagnetic reversing valve (3), and a piston rod of the tilting oil cylinder (6) is pushed to retract;
When the left side movement is executed, a Y1 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve (1) is electrified, a Y5 electromagnet of the third two-position four-way electromagnetic reversing valve (4) is electrified, and hydraulic oil from a system oil supply path enters a left side movement oil cylinder (7) through the three-position four-way electromagnetic proportional reversing valve (1), the first three-way pipe (9), the third three-way pipe (11) and the third two-position four-way electromagnetic reversing valve (4) to push a piston rod to extend;
When the right side movement is executed, a Y2 proportion electromagnet of the three-position four-way electromagnetic proportional reversing valve (1) is electrified, a Y5 electromagnet of the third two-position four-way electromagnetic reversing valve (4) is electrified, and hydraulic oil from a system oil supply path enters the right side movement oil cylinder (8) through the three-position four-way electromagnetic proportional reversing valve (1), the second three-way pipe (10), the fourth three-way pipe (12) and the third two-position four-way electromagnetic reversing valve (4) to push a piston rod to extend.
2. The full scale control hydraulic system of a forward fork truck attachment of claim 1, wherein: two working oil ports of the first two-position four-way electromagnetic reversing valve (2) are respectively connected with a rodless cavity and a rod cavity of the forward moving oil cylinder (5); two working oil ports of the second two-position four-way electromagnetic reversing valve (3) are respectively connected with a rodless cavity and a rod cavity of the inclined oil cylinder (6); the side-shifting oil cylinder comprises a left side-shifting oil cylinder (7) and a right side-shifting oil cylinder (8), two working oil ports of the third two-position four-way electromagnetic reversing valve (4) are respectively connected with rodless cavities of the left side-shifting oil cylinder (7) and the right side-shifting oil cylinder (8), and a rod cavity of the left side-shifting oil cylinder (7) is communicated with a rod cavity of the right side-shifting oil cylinder (8).
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| CN201810586644.1A CN108529510B (en) | 2018-06-05 | 2018-06-05 | Full-proportion control hydraulic system of forward forklift attachment |
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| CN201810586644.1A CN108529510B (en) | 2018-06-05 | 2018-06-05 | Full-proportion control hydraulic system of forward forklift attachment |
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| CN108529510B true CN108529510B (en) | 2024-05-28 |
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| CN113716497A (en) * | 2020-05-25 | 2021-11-30 | 苏州先锋物流装备科技有限公司 | Forklift hydraulic control system |
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| CN104340928A (en) * | 2014-09-11 | 2015-02-11 | 宁波力达物流设备有限公司 | Multifunctional hydraulic fork truck |
| CN106629449A (en) * | 2016-10-08 | 2017-05-10 | 武汉船用机械有限责任公司 | Constant-tension hydraulic pressure control system |
| CN108052071A (en) * | 2018-02-07 | 2018-05-18 | 山西金瑞高压环件有限公司 | A kind of numerical control rolling machine folded arm servo-control system |
| CN208327311U (en) * | 2018-06-05 | 2019-01-04 | 安徽合力股份有限公司 | A kind of full scale control hydraulic system of reach truck accessory |
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| CN108529510A (en) | 2018-09-14 |
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