CN104495709A - Loading pressure feedback proportional multi-way valve for electric forklift - Google Patents
Loading pressure feedback proportional multi-way valve for electric forklift Download PDFInfo
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- CN104495709A CN104495709A CN201510026413.1A CN201510026413A CN104495709A CN 104495709 A CN104495709 A CN 104495709A CN 201510026413 A CN201510026413 A CN 201510026413A CN 104495709 A CN104495709 A CN 104495709A
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- valve
- containing cavity
- pressure feedback
- plug
- load pressure
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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
-
- 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
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Geology (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a loading pressure feedback proportional multi-way valve for an electric forklift. The loading pressure feedback proportional multi-way valve includes a valve body (3), a main valve element (4) and a pilot execution element, wherein the valve body (3) is provided with an oil inlet (160 and a return oil hole (6) communicating with a valve cavity (17); the loading pressure feedback proportional multi-way valve also includes force balancing devices and a loading pressure feedback device, wherein the force balancing devices are connected to two ends of the main valve element (4), the loading pressure feedback device is installed to be close to one side of the valve body communicating with an oil cylinder connecting port (5); the pilot execution element is two proportional pilot valve assemblies (15) which respectively communicate with the valve cavities of the force balancing devices at two ends of the main valve element (4). After adopting the loading pressure feedback proportional multi-way valve, the heavier the cargoes on the fork are, the slower the descent rate is, and the lighter the cargoes on the fork are, the quicker the descent rate is, thus doing not need manual adjustment, and greatly improving automation and production efficiency.
Description
Technical field
The present invention relates to the technical field of valve, is specifically the load pressure feedback proportional multi-way valve on electri forklift of speed that a kind of control object had on the load-and-unload transport of lifting mechanism declines due to deadweight or rotates.
Background technology
Electri forklift, refers to that electricity consumption is to carry out the fork truck of operation.Electri forklift is because its operation control is easy, flexible, noise is little, pollution is few, the manipulation strength of operating personal is light, and its electric power steering, acceleration-controlled system, hydraulic control system and brake system are all controlled by electric signal, greatly reduce the labour intensity of operating personal, so very large help is had for the accuracy improving its work efficiency and work, therefore, the industries such as harbour, storage and tobacco, food, light textile are applied to.And the pallet fork of electri forklift has rate request when declining, when zero load, the descending speed of pallet fork can not be excessively slow, such as be less than 300 mm/second, when heavier loads, the descending speed of pallet fork can not be too fast, such as can not be greater than 600 mm/second, therefore, the pallet fork of electri forklift needs to be controlled by hydraulic pressure lowering means when declining, and proportional multi-way valve is as the core liquid casting die controlling the motion such as object up-down, inclination, the effect serving decision is controlled to the pallet fork descending speed of fork truck.In prior art, there is various structures to the control of electri forklift pallet fork descending speed.As " the hydraulic pressure lowering means of electri forklift " patent that publication number disclosed on State Intellectual Property Office website is CN102838056A, it comprises the guiding valve and servomotor that are communicated with oil cylinder, guiding valve is connected with the output shaft of servomotor by transmission device, this transmission device comprises the first gear, second gear, rotate silk braid, sliding screw and case, first gear and the second gears meshing, case and servomotor are fixed, first gear is connected with the output shaft of servomotor, second gear is connected with the one end of rotating silk braid, the rotation other end of silk braid and one end of sliding screw screw, the other end of sliding screw is connected with the spool of guiding valve.And for example on State Intellectual Property Office website, disclosed publication number is " load-sensitive electric proportional multi-loop valve " patent of CN103671335A, it arranges two-way pilot operated directional control valve, two-way electromagnetic valve, logical direction valve and the electronic by pass valve of proportional-type on multiway valve oil circuit, make its two pump interflow work when execution hoists action, single pump work during other actions, another pump off-load.
But, these structures above-mentioned have following shortcoming: no matter be the structure being realized the control of pallet fork descending speed by servomotor and gear mechanism, or the structure of the single of control pump or two work is carried out by arranging multiple valve on multiway valve oil circuit, all there is complex structure, problem that cost is high in them, and structure more complex fault rate is higher.In such as first technical scheme, relate to servomotor, gear-driven assembly, part is numerous on the one hand, and servomotor cost is very high on the other hand, and the corresponding manufacturing cost that causes increases; Again in such as second technical scheme, many valves are added in multiway valve oil circuit, there are two-way pilot operated directional control valve, two-way electromagnetic valve, logical direction valve and the electronic by pass valve of proportional-type etc., adding of these valves also makes cost increase on the one hand, on the other hand make oil circuit become more complicated, the assembly of valve also more complicated, volume is huger.
In addition, also have the structure adding cutoff port in main valve plug inside, but there is following problem in this structure:
1) because main valve plug itself is a longilineal part, will carry out the processing of cutoff port in main valve plug inside, this difficulty of processing is very large, and the requirement of Fabricating machinery is also very high;
2) same, because main valve plug is a longilineal part, when its work, be easily out of shape, and a distortion will produce the phenomenon of card valve, the cutoff port of its inside just lost efficacy, and to descending speed also get out of hand, therefore, there is great potential safety hazard;
3) once break down, the proportional multi-way valve of this structure cannot carry out keeping in repair and adjusting at all, can only change a complete set of parts, therefore, greatly increase use cost.
Summary of the invention
Technical matters to be solved by this invention is, provides that a kind of structure is simple, cost is low, is convenient to maintenance, can realize the load pressure feedback proportional multi-way valve on electri forklift controlling to adjust pallet fork descending speed according to loading weight.
For solving the problems of the technologies described above, load pressure feedback proportional multi-way valve on electri forklift provided by the invention, comprise valve body, main valve plug and guide's executive item, described main valve plug is slidably fitted in the valve pocket of valve body, guide's executive item is arranged in valve body, and valve body is provided with the oil inlet and return opening that are communicated with valve pocket; It also comprises thrust balancing device and load pressure feedback device, and described thrust balancing device is connected to the two ends of main valve plug, and load pressure feedback device is arranged on the valve body side near being communicated with loading cylinders communication port; Described guide's executive item is two proportion pilot valve modules, and two proportion pilot valve modules communicate with the valve pocket at the thrust balancing device place at main valve plug two ends respectively.
Described thrust balancing device comprises the first valve block, the second valve block, spring and spring chair, first valve block is connected to the valve body side away from loading cylinders communication port and inside has the first containing cavity, second valve block is connected to the valve body side near loading cylinders communication port and inside has the second containing cavity, and the two ends of main valve plug are stretched in the first containing cavity and the second containing cavity respectively; The two ends of main valve plug are equipped with spring and spring chair, and spring chair is socketed on main valve plug, and one end and the spring chair of spring push against, and push against at the bottom of the hole of the other end and the first containing cavity or at the bottom of the hole of the second containing cavity; Load pressure feedback device to be connected on the second valve block and to push against with the end of main valve plug or throw off; Two proportion pilot valve modules oil circuit control is separately communicated with the second containing cavity with the first containing cavity respectively.
Described load pressure feedback device comprises small valve core, little spring and plug screw, second valve block has the 3rd containing cavity be communicated with the second containing cavity on the same axis of the second containing cavity, one end of small valve core is slidably connected at the connectivity part of the second containing cavity and the 3rd containing cavity, one end of the other end and little spring is socketed, the other end of little spring is socketed on plug screw, and plug screw is threaded on the second valve block; Also be provided with load pressure feedback oil circuit in second valve block, one end of described load pressure feedback oil circuit is communicated with the 3rd containing cavity, and the other end is communicated with the loading cylinders communication port in valve body.
This proportional multi-way valve also comprises check valve and control cock, described control cock is arranged in the valve body of the first valve block side, check valve is arranged in the valve body of loading cylinders oil outlet side, and, spool one end of check valve and the valve body at loading cylinders oil outlet place form valve, and the other end is communicated with control cock by oil circuit.
After adopting above structure, the present invention compared with prior art, has following advantage:
1) because main valve plug is respectively by the combined action of spring and priority valve pressure and load feedback small valve core thrust, regulate and make the thrust at main valve plug two ends reach balance, thus determine the size of hydraulic fluid port aperture on main valve plug, regulate the speed that electri forklift upper fork declines; Therefore, when the goods on pallet fork is heavier, on main valve plug, the aperture of return opening is less, and descending speed will be slack-off, otherwise when the goods on pallet fork is lighter, on main valve plug, the aperture of return opening is larger, and descending speed will accelerate; And these adjustments are all automatically regulated by this proportional multi-way valve to realize, artificially need not regulate, greatly improve automation, then under the premise that security is guaranteed, greatly enhance productivity;
2) due to the processing without the need to carrying out cutoff port in main valve plug inside, also without the need to extra drive disk assembly, and just oil circuit communication is carried out in valve body inside and outside, therefore, becoming simply, avoiding occurring the phenomenon of card valve making structure, control more simultaneously, productive costs reduces greatly;
3) owing to just increasing valve block outward at valve body, and small valve core is connected in valve block, therefore, even if valve breaks down, is also convenient to very much maintenance and checks.
Accompanying drawing explanation
Fig. 1 is the structural representation of the load pressure feedback proportional multi-way valve of the present invention on electri forklift.
Wherein, the 1, first valve block; 2, control cock; 3, valve body; 4, main valve plug; 5, loading cylinders communication port; 6, return opening; 7, check valve; 8, load pressure feedback oil circuit; 9, the second valve block; 10, plug screw; 11, little spring; 12, the 3rd containing cavity; 13, small valve core; 14, the second containing cavity; 15, proportion pilot valve module; 16, oil inlet; 17, valve pocket; 18, spring chair; 19, spring; 20, the first containing cavity; 21, electromagnet.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.
The structural representation of the load pressure feedback proportional multi-way valve of the present invention as shown in Figure 1 on electri forklift is known, it comprises valve body 3, main valve plug 4 and guide's executive item, described main valve plug 4 is slidably fitted in the valve pocket 17 of valve body 3, guide's executive item is arranged in valve body 3, and valve body 3 is provided with the oil inlet 16 and return opening 6 that are communicated with valve pocket 17.It also comprises thrust balancing device and load pressure feedback device, and described thrust balancing device is connected to the two ends of main valve plug 4, and load pressure feedback device is arranged on valve body 3 side near being communicated with loading cylinders communication port 5.Described guide's executive item is two proportion pilot valve modules 15, and two proportion pilot valve modules 15 communicate with the valve pocket at the thrust balancing device place at main valve plug 4 two ends respectively.
Described thrust balancing device comprises the first valve block 1, second valve block 9, spring 19 and spring chair 18, first valve block 1 is connected to valve body 3 side away from loading cylinders communication port 5 and inside has the first containing cavity 20, second valve block 9 is connected to valve body 3 side near loading cylinders communication port 5 and inside has the second containing cavity 14, and the two ends of main valve plug 4 are stretched in the first containing cavity 20 and the second containing cavity 14 respectively.The two ends of main valve plug 4 are equipped with spring 19 and spring chair 18, and spring chair 18 is socketed on main valve plug 4, and one end and the spring chair 18 of spring 19 push against, and push against at the bottom of the hole of the other end and the first containing cavity 20 or at the bottom of the hole of the second containing cavity 14.Load pressure feedback device to be connected on the second valve block 9 and to push against with the end of main valve plug 4 or throw off.The respective oil circuit control of two proportion pilot valve modules 15 is communicated with the second containing cavity 14 with the first containing cavity 20 respectively.
Described load pressure feedback device comprises small valve core 13, little spring 11 and plug screw 10, second valve block 9 has the 3rd containing cavity 12 be communicated with the second containing cavity 14 on the same axis of the second containing cavity 14, one end of small valve core 13 is slidably connected at the connectivity part of the second containing cavity 14 and the 3rd containing cavity 12, one end of the other end and little spring 11 is socketed, the other end of little spring 11 is socketed on plug screw 10, and plug screw 10 is threaded on the second valve block 9.Also be provided with load pressure feedback oil circuit 8 in second valve block 9, one end of described load pressure feedback oil circuit 8 is communicated with the 3rd containing cavity 12, and the other end is communicated with the loading cylinders communication port 5 in valve body 3.
This proportional multi-way valve also comprises check valve 7 and control cock 2, described control cock 2 is arranged in the valve body 3 of the first valve block 1 side, check valve 7 is arranged in the valve body 3 of loading cylinders oil outlet 5 side, and, spool one end of check valve 7 and the valve body 3 at loading cylinders oil outlet 5 place form valve, and the other end is communicated with control cock 2 by oil circuit.
The principle of work of proportional multi-way valve of the present invention is as follows:
When the pallet fork of electri forklift needs upwards lifting, control fluid near the proportion pilot valve module 15 of the second valve block 9 enters in the second containing cavity 14, promotion main valve plug 4 left (based on the direction shown in accompanying drawing 1) is mobile, fluid enters valve pocket 18 from the oil inlet 16 of valve body 3 through main valve plug 4, oil circuit again in valve body 3 enters loading cylinders communication port 5 place and pushes the valve of check valve 7 open, thus enter loading cylinders, promote pallet fork upwards lifting.Balance with the spring force of the first containing cavity 20 inner spring under the thrust that main valve plug 4 produces at guide's oil pressure of the second containing cavity 14, stop the movement of main valve plug 4, the valve valve port opening that main valve plug 4 and valve body 3 are formed keeps certain.
When the pallet fork of electri forklift needs to decline, now, drive without the need to fluid, the decline of pallet fork then needs the deadweight of load to realize.The control fluid of the proportion pilot valve module 15 in left side enters the first containing cavity 20, promote main valve plug 4 to move right, simultaneously, oil pocket release fluid on rear side of the check valve 7 that control cock 2 through the first valve block 1 junction controls the second valve block 9 junction, now, the valve open of check valve 7, the fluid of loading cylinders refluxes from loading cylinders communication port 6, the first via flow back into return opening 6 through main valve plug 4 and takes back fuel tank, second road binders liquid flows in the 3rd containing cavity 12 through load pressure feedback oil circuit 8, the pressure of loading cylinders feeds back on small valve core 13 thus, and produce the end of thrust to main valve plug 4 by small valve core 13.It is F1 that guide's fluid in first containing cavity 20 produces thrust to main valve plug 4, the spring force of the second containing cavity 14 inner spring 19 is F2, the thrust of loading cylinders retroactive effect on small valve core 13 is F3, the spring force of little spring 11 is F4, now, F1=F2+F3+F4, main valve plug 4 stops mobile, and now valve port keeps certain aperture.Therefore, when proportion pilot pressure size is constant, namely when F1 is constant, when load is larger, load pressure is higher, and the thrust F3 produced on small valve core 13 is larger, therefore, spring force F2 and spring force F4 is less, namely the compression stroke of spring 19 and little spring 11 is little, and the displacement of main valve plug 4 movement is just little, and the valve port opening that return opening 6 and the main valve plug 4 of oil sump tank are formed is just little.In other words, when the load is large, the descending speed of pallet fork is just little.Otherwise, when proportion pilot pressure size is constant, namely when thrust F1 is constant, when load, more hour load pressure is lower, the thrust F3 produced on small valve core 13 is less, and therefore spring force F2 and spring force F4 is larger, and namely the compression stroke of spring 19 and little spring 11 is large, the displacement of main valve plug 4 movement is just large, and the valve port opening that return opening 6 and the main valve plug 4 of oil sump tank are formed is just large.In other words, when the load is small, the descending speed of pallet fork is just large.Thus when automatically realizing heavy duty descending speed can not too fast and underload time descending speed can not be excessively slow object.
Claims (4)
1. the load pressure feedback proportional multi-way valve on electri forklift, comprise valve body (3), main valve plug (4) and guide's executive item, described main valve plug (4) is slidably fitted in the valve pocket (17) of valve body (3), guide's executive item is arranged in valve body (3), and valve body (3) is provided with the oil inlet (16) and return opening (6) that are communicated with valve pocket (17); It is characterized in that: it also comprises thrust balancing device and load pressure feedback device, described thrust balancing device is connected to the two ends of main valve plug (4), and load pressure feedback device is arranged on valve body (3) side near being communicated with loading cylinders communication port (5); Described guide's executive item is two proportion pilot valve modules (15), and two proportion pilot valve modules (15) communicate with the valve pocket at the thrust balancing device place at main valve plug (4) two ends respectively.
2. the load pressure feedback proportional multi-way valve on electri forklift according to claim 1, it is characterized in that: described thrust balancing device comprises the first valve block (1), second valve block (9), spring (19) and spring chair (18), first valve block (1) is connected to valve body (3) side away from loading cylinders communication port (5) and inside has the first containing cavity (20), second valve block (9) is connected to valve body (3) side near loading cylinders communication port (5) and inside has the second containing cavity (14), the two ends of main valve plug (4) are stretched in the first containing cavity (20) and the second containing cavity (14) respectively, the two ends of main valve plug (4) are equipped with spring (19) and spring chair (18), spring chair (18) is socketed on main valve plug (4), one end and the spring chair (18) of spring (19) push against, and push against at the bottom of the hole of the other end and the first containing cavity (20) or at the bottom of the hole of the second containing cavity (14), load pressure feedback device is connected to the second valve block (9) and goes up and push against with the end of main valve plug (4) or throw off, the oil circuit control that two proportion pilot valve modules (15) are respective is communicated with the second containing cavity (14) with the first containing cavity (20) respectively.
3. the load pressure feedback proportional multi-way valve on electri forklift according to claim 2, it is characterized in that: described load pressure feedback device comprises small valve core (13), little spring (11) and plug screw (10), second valve block (9) has the 3rd containing cavity (12) be communicated with the second containing cavity (14) on the same axis of the second containing cavity (14), one end of small valve core (13) is slidably connected at the connectivity part of the second containing cavity (14) and the 3rd containing cavity (12), one end of the other end and little spring (11) is socketed, the other end of little spring (11) is socketed on plug screw (10), plug screw (10) is threaded on the second valve block (9), load pressure feedback oil circuit (8) is also provided with in second valve block (9), one end of described load pressure feedback oil circuit (8) is communicated with the 3rd containing cavity (12), and the other end is communicated with the loading cylinders communication port (5) in valve body (3).
4. the load pressure feedback proportional multi-way valve on electri forklift according to claim 2, it is characterized in that: this proportional multi-way valve also comprises check valve (7) and control cock (2), described control cock (2) is arranged in the valve body (3) of the first valve block (1) side, check valve (7) is arranged in the valve body (3) of loading cylinders oil outlet (5) side, and, spool one end of check valve (7) and the valve body (3) at loading cylinders oil outlet (5) place form valve, the other end is communicated with control cock (2) by oil circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510026413.1A CN104495709B (en) | 2015-01-20 | 2015-01-20 | Load pressure feedback proportional multi-way valve on electri forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510026413.1A CN104495709B (en) | 2015-01-20 | 2015-01-20 | Load pressure feedback proportional multi-way valve on electri forklift |
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| Publication Number | Publication Date |
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| CN104495709A true CN104495709A (en) | 2015-04-08 |
| CN104495709B CN104495709B (en) | 2016-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510026413.1A Active CN104495709B (en) | 2015-01-20 | 2015-01-20 | Load pressure feedback proportional multi-way valve on electri forklift |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564367A (en) * | 2016-10-20 | 2017-04-19 | 国网山东省电力公司菏泽供电公司 | Warehousing work vehicle loading and unloading system and warehousing work vehicle |
| CN111547648A (en) * | 2020-04-24 | 2020-08-18 | 安徽合力股份有限公司 | Stacker load holding hydraulic system |
| CN114623267A (en) * | 2022-03-23 | 2022-06-14 | 浙江海宏液压科技股份有限公司 | Electric control multi-way valve |
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| CN203809393U (en) * | 2014-02-28 | 2014-09-03 | 宁波斯达弗液压传动有限公司 | Lifting valve element of multi-path valve |
| CN204417063U (en) * | 2015-01-20 | 2015-06-24 | 宁波高新协力机电液有限公司 | Load pressure feedback proportional multi-way valve on electri forklift |
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| CH636931A5 (en) * | 1979-04-12 | 1983-06-30 | Aroflex Ag | Proportional valve |
| WO1982001748A1 (en) * | 1980-11-10 | 1982-05-27 | Reeves Jerry L | Load responsive flow control valve |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564367A (en) * | 2016-10-20 | 2017-04-19 | 国网山东省电力公司菏泽供电公司 | Warehousing work vehicle loading and unloading system and warehousing work vehicle |
| CN106564367B (en) * | 2016-10-20 | 2020-07-07 | 国网山东省电力公司菏泽供电公司 | Storage operation vehicle loading and unloading system and storage operation vehicle |
| CN111547648A (en) * | 2020-04-24 | 2020-08-18 | 安徽合力股份有限公司 | Stacker load holding hydraulic system |
| CN111547648B (en) * | 2020-04-24 | 2024-05-03 | 安徽合力股份有限公司 | Hydraulic system for load maintenance of stacker |
| CN114623267A (en) * | 2022-03-23 | 2022-06-14 | 浙江海宏液压科技股份有限公司 | Electric control multi-way valve |
| CN114623267B (en) * | 2022-03-23 | 2024-04-09 | 浙江海宏液压科技股份有限公司 | Electric control multi-way valve |
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| Publication number | Publication date |
|---|---|
| CN104495709B (en) | 2016-11-30 |
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