CN111153354A - Electric fork-lift hydraulic parking braking system and electric fork-lift - Google Patents
Electric fork-lift hydraulic parking braking system and electric fork-lift Download PDFInfo
- Publication number
- CN111153354A CN111153354A CN202010130197.6A CN202010130197A CN111153354A CN 111153354 A CN111153354 A CN 111153354A CN 202010130197 A CN202010130197 A CN 202010130197A CN 111153354 A CN111153354 A CN 111153354A
- Authority
- CN
- China
- Prior art keywords
- oil
- brake
- valve
- hydraulic
- forklift
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- B66F9/07509—Braking
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Braking Systems And Boosters (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a hydraulic parking braking system of an electric forklift, which comprises: the main oil supply path is provided with a priority valve, a CF port of the priority valve is used for being connected with an oil inlet of a steering gear of the forklift, and an EF port of the priority valve is used for being connected with an oil inlet of a multi-way valve of a forklift working system; the brake cylinder is used for parking and braking the forklift; the brake oil path is used for providing hydraulic oil for the brake cylinder, and the oil supply end of the brake oil path is connected with the CF port; and the brake valve block is arranged on the brake oil path and is used for controlling the brake cylinder to act so that the brake cylinder can perform parking brake on the forklift or is in an unlocked state. The hydraulic parking brake system of the electric forklift does not need to adopt an energy accumulator to provide hydraulic oil for the brake cylinder, and compared with the prior art, the hydraulic parking brake system of the electric forklift saves the energy accumulator, saves components and parts and has low cost; meanwhile, the structure is simplified, and the volume is reduced. The invention also discloses an electric forklift comprising the hydraulic parking braking system of the electric forklift.
Description
Technical Field
The invention relates to the technical field of forklift braking, in particular to a hydraulic parking braking system of an electric forklift. In addition, the invention also relates to an electric forklift comprising the hydraulic parking brake system of the electric forklift.
Background
For electric forklifts, for example, small tonnage counter weight electric forklifts, hydraulic braking is the parking braking method commonly used.
However, the existing hydraulic parking brake system is usually an accumulator type hydraulic parking brake, and has a complex structure, high cost and large volume.
Therefore, how to provide a hydraulic parking brake system for an electric forklift with simple structure, low cost and small volume is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the invention aims to provide a hydraulic parking brake system for an electric forklift, which has the advantages of simple structure, low cost and small volume.
The invention also aims to provide the electric forklift comprising the hydraulic parking brake system of the electric forklift, and the hydraulic parking brake system is simple in structure, low in cost and small in size.
In order to achieve the above purpose, the invention provides the following technical scheme:
an electric forklift hydraulic parking brake system, comprising:
the main oil supply path is provided with a priority valve, a CF port of the priority valve is used for being connected with an oil inlet of a steering gear of the forklift, and an EF port of the priority valve is used for being connected with an oil inlet of a multi-way valve of a forklift working system;
the brake cylinder is used for parking and braking the forklift;
the brake oil path is used for providing hydraulic oil for the brake cylinder, and an oil supply end of the brake oil path is connected with the CF port;
the brake valve block is arranged on the brake oil path and used for controlling the brake cylinder to act so that the brake cylinder can perform parking brake on the forklift or is in an unlocking state.
Preferably, the brake cylinder is a single-rod single-action hydraulic cylinder, an oil inlet of the brake valve block is connected with the oil supply end, a working oil port of the brake valve block is connected with a rod cavity of the brake cylinder, and an oil return port of the brake valve block is connected with an oil return tank;
when an oil inlet of the brake valve block is communicated with a working oil port of the brake valve block, the brake cylinder is in the unlocking state; when an oil return port of the brake valve block is communicated with a working oil port of the brake valve block, the brake cylinder performs parking brake on the forklift under the action of self spring force.
Preferably, the brake valve block includes two three way solenoid valves, two three way solenoid valves's oil inlet with the oil feed end links to each other, two three way solenoid valves's working oil mouth with there is the pole chamber to link to each other, two three way solenoid valves's oil return opening is connected the oil return case.
Preferably, the braking valve block further comprises a pressure reducing valve connected with the two-position three-way electromagnetic valve in series, and a working oil port of the two-position three-way electromagnetic valve is connected with the rod cavity through the pressure reducing valve.
Preferably, the brake valve block further comprises a first check valve connected in parallel with the pressure reducing valve and used for enabling oil in the rod cavity to flow back to the two-position three-way electromagnetic valve.
Preferably, the brake system further comprises a pressure switch for detecting whether the pressure of the hydraulic oil entering the brake cylinder reaches the standard.
Preferably, a second check valve is arranged between the oil supply end and an oil inlet of the brake valve block and used for preventing oil of the brake valve block from flowing back to the CF port.
Preferably, the main oil supply path includes:
the oil pump is used for being connected with the oil inlet of the priority valve;
and the hydraulic oil tank is connected with the oil pump and is used for supplying oil to the oil pump.
Preferably, a filter is arranged between the oil pump and the hydraulic oil tank.
The electric forklift comprises a parking brake system, wherein the parking brake system is any one of the hydraulic parking brake systems of the electric forklift.
The invention provides a hydraulic parking brake system of an electric forklift, wherein hydraulic oil required by brake cylinder braking is supplied from a CF port of a priority valve through a main oil supply path. That is, the steering gear of the forklift, the multi-way valve of the forklift working system and the brake cylinder share the same main oil supply path and have the same oil supply source. In addition, the CF port of the priority valve is dynamically balanced and can output stable pressure, so that the hydraulic parking brake system of the electric forklift does not need to adopt an energy accumulator to provide hydraulic oil for the brake cylinder, and compared with the prior art, the hydraulic parking brake system of the electric forklift saves the energy accumulator and related structures, saves components and saves cost; meanwhile, the structure of the hydraulic parking braking system of the forklift is simplified, and the size is reduced.
The electric forklift provided by the invention comprises the hydraulic parking braking system of the electric forklift and has the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a hydraulic parking brake system of an electric forklift according to an embodiment of the invention;
fig. 2 is a schematic structural view of the brake valve block in fig. 1.
The reference numerals in fig. 1 and 2 are as follows:
1 is a main oil supply passage, 11 is an oil pump, 12 is a hydraulic oil tank, 13 is a filter, 2 is a priority valve, 3 is a brake cylinder, 4 is a brake oil passage, 5 is a brake valve block, 51 is a two-position three-way electromagnetic valve, 52 is a pressure reducing valve, 53 is a first check valve, 54 is a second check valve, 6 is a pressure switch, 7 is a steering gear, and 8 is a multi-way valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide the hydraulic parking braking system of the electric forklift, which has the advantages of simple structure, low cost and small volume. The other core of the invention is to provide the electric forklift comprising the hydraulic parking brake system of the electric forklift, and the hydraulic parking brake system has the advantages of simple structure, low cost and small volume.
Referring to fig. 1-2, fig. 1 is a schematic structural diagram of a hydraulic parking brake system of an electric forklift according to an embodiment of the present invention; fig. 2 is a schematic structural view of the brake valve block in fig. 1.
The invention provides a hydraulic parking brake system of an electric forklift, which mainly comprises a main oil supply path 1, a brake cylinder 3, a brake oil path 4, a brake valve block 5 and the like.
Specifically, the main oil supply path 1 is provided with a priority valve 2, a CF port of the priority valve 2 is used for being connected with an oil inlet of a steering gear 7 of the forklift, and an EF port of the priority valve 2 is used for being connected with an oil inlet of a multi-way valve 8 of a forklift working system.
The brake cylinder 3 is used for parking brake to the fork truck, and the braking oil circuit 4 is used for providing hydraulic oil for the brake cylinder 3, and the oil feed end and the CF mouth of braking oil circuit 4 are connected.
That is, in the present invention, the hydraulic oil required for braking the brake cylinders 3 is supplied from the CF ports of the priority valves 2 through the main oil supply passage 1.
In other words, the steering 7 of the forklift, the multi-way valve 8 of the forklift operating system, and the brake cylinder 3 share the same main oil supply line 1 and have the same oil supply source.
In addition, the CF port of the priority valve 2 is dynamically balanced and can output stable pressure, so that the hydraulic parking brake system of the electric forklift does not need to adopt an energy accumulator to provide hydraulic oil for the brake cylinder 3, and compared with the prior art, the hydraulic parking brake system of the electric forklift saves the energy accumulator and related structures, saves components and saves cost; meanwhile, the structure of the hydraulic parking braking system of the forklift is simplified, and the size is reduced.
It will be appreciated that the brake oil circuit 4 is provided with a brake valve block 5, and the brake valve block 5 is used for controlling the brake cylinder 3 to act so that the brake cylinder 3 performs parking brake on the forklift or the brake cylinder 3 is in an unlocked state.
That is, the movement direction of the piston rod of the brake cylinder 3 can be changed by controlling the brake valve block 5, so that when the piston rod of the brake cylinder 3 extends, the brake cylinder 3 can be used for parking and braking the forklift; when the piston rod of the brake cylinder 3 is retracted, the brake cylinder 3 is unlocked, and the vehicle can be started or in a driving state.
It should be noted that the specific structure of the brake valve block 5 is not limited in this embodiment, and those skilled in the art can refer to the prior art.
In consideration of convenience of control, on the basis of the above embodiment, the brake cylinder 3 is a single-rod single-acting hydraulic cylinder, an oil inlet of the brake valve block 5 is connected with an oil supply end of the brake oil path 4, a working oil port of the brake valve block 5 is connected with a rod cavity of the brake cylinder 3, and an oil return port of the brake valve block 5 is connected with an oil return tank.
It can be understood that an oil inlet of the brake valve block 5 and an oil supply end of the brake oil path 4, a working oil port of the brake valve block 5 and a rod cavity of the brake cylinder 3, and an oil return port of the brake valve block 5 and an oil return tank are connected through oil pipes.
When the oil inlet of the brake valve block 5 is communicated with the working oil port thereof, the brake cylinder 3 is in an unlocked state; when an oil return port of the brake valve block 5 is communicated with a working oil port of the brake valve block, the brake cylinder 3 performs parking brake on the forklift under the action of the spring force of the brake cylinder.
That is, when the vehicle is parked, the passage between the working oil port of the brake valve block 5 and the oil return port thereof is opened, and at this time, the brake cylinder 3 makes the hydraulic oil in the rod cavity of the brake cylinder 3 flow back to the oil return tank through the brake valve block 5 under the action of the self spring force, so that the brake cylinder 3 is locked, and the vehicle is parked. When the automobile is normally parked, a channel between a working oil port of the brake valve block 5 and an oil return port of the brake valve block is always in an open state, the brake cylinder 3 is always in a locked state under the action of the self spring force of the brake cylinder 3, and the automobile is kept in a parking state.
When the vehicle is ready to start, a channel between a working oil port of the brake valve block 5 and an oil inlet of the brake valve block is controlled to be opened, at the moment, hydraulic oil of the main oil supply path 1 enters the brake valve block 5 through a CF port of the priority valve 2 and finally enters a rod cavity of the brake cylinder 3, under the action of the hydraulic oil in the rod cavity, a piston rod of the brake cylinder 3 retracts, the brake cylinder 3 is in an unlocking state, and at the moment, the vehicle can be started. In the normal running process of the vehicle, a channel between a working oil port of the brake valve block 5 and an oil inlet of the brake valve block is always in an open state, the main oil supply channel 1 continuously supplies oil to the brake valve block 5 through a CF port of the priority valve 2, and the working oil port of the brake valve block 5 continuously outputs pressure, so that the brake cylinder 3 is kept in an unlocked state, and the normal running of the vehicle is ensured.
In view of the simplicity and easy implementation of the specific structure of the brake valve block 5, on the basis of the above embodiment, the brake valve block 5 includes the two-position three-way electromagnetic valve 51, an oil inlet of the two-position three-way electromagnetic valve 51 is connected to an oil supply end of the brake oil path 4, a working oil port of the two-position three-way electromagnetic valve 51 is connected to the rod chamber, and an oil return port of the two-position three-way electromagnetic valve 51 is connected to the oil return tank.
That is to say, in this embodiment, the main control valve of the brake valve block 5 is the two-position three-way electromagnetic valve 51, and the controller can control the on/off of the two-position three-way electromagnetic valve 51, so as to open different channels in the two-position three-way electromagnetic valve 51.
For example, when the two-position three-way solenoid valve 51 is powered off, the electromagnet of the two-position three-way solenoid valve 51 does not act, the passage between the working oil port of the two-position three-way solenoid valve 51 and the oil return port thereof is communicated, and the two-position three-way solenoid valve 51 is in a closed state. When the two-position three-way electromagnetic valve 51 is powered on, the electromagnet of the two-position three-way electromagnetic valve 51 acts, the passage between the working oil port of the two-position three-way electromagnetic valve 51 and the oil inlet thereof is communicated, and the two-position three-way electromagnetic valve 51 is in an open state.
It should be understood that the present invention is not limited to the specific control method of the control valve block, and a person skilled in the art may control the control valve block according to the specific structure of the control valve block by combining a known control method, so as to control the action of the brake cylinder 3.
For example, in this embodiment, an unlocking electronic hand brake button and an electronic parking button may be provided on the forklift to send an unlocking signal and a parking brake signal to the controller, so that the controller controls the two-position three-way solenoid valve 51 to be opened or closed. Specifically, when the unlocking electronic hand brake button is pressed, the two-position three-way electromagnetic valve 51 is electrified and opened, hydraulic oil in the main oil supply path 1 enters the two-position three-way electromagnetic valve 51 through a CF port of the priority valve 2 and finally flows into a rod cavity, so that the brake cylinder 3 is unlocked; when the electronic parking button is pressed, the two-position three-way electromagnetic valve 51 is powered off and closed, hydraulic oil in the rod cavity of the brake cylinder 3 flows back to the two-position three-way electromagnetic valve 51 and finally flows into the oil return tank.
In order to prevent the brake cylinder 3 from being damaged by pressure impact, on the basis of the above-described embodiment, the brake valve block 5 further includes a pressure reducing valve 52 provided in series with the two-position three-way solenoid valve 51, and the working port of the two-position three-way solenoid valve 51 is connected to the rod chamber through the pressure reducing valve 52.
That is, when the brake cylinder 3 is unlocked, the hydraulic oil in the line feed passage 1 flows into the two-position three-way solenoid valve 51 via the CF port of the priority valve 2, then passes through the pressure reducing valve 52, and finally reaches the rod chamber of the brake cylinder 3.
The pressure reducing valve 52 reduces the pressure of the oil output by the two-position three-way electromagnetic valve 51 to a certain pressure value, so that the pressure of the oil entering the brake cylinder 3 is kept stable, and the brake cylinder 3 is prevented from being damaged by pressure impact.
Further, in view of the efficiency of the brake cylinder 3 for parking brake of the forklift, on the basis of the above embodiment, the brake valve block 5 further includes a first check valve 53 provided in parallel with the pressure reducing valve 52 for returning the oil of the rod chamber to the two-position three-way solenoid valve 51.
That is, when the brake cylinder 3 is used for parking and braking the forklift, the hydraulic oil in the rod cavity of the brake cylinder 3 flows into the two-position three-way electromagnetic valve 51 through the first one-way valve 53 and then flows back into the oil return tank through the two-position three-way electromagnetic valve 51.
In order to increase the reliability of the system, on the basis of any one of the above embodiments, a pressure switch 6 is further included for detecting whether the pressure of the hydraulic oil entering the brake cylinder 3 reaches a standard, so as to determine whether the hydraulic parking brake system of the electric forklift truck is in failure according to a detection signal of the pressure switch 6.
That is, in the present embodiment, the pressure switch 6 is used to detect the pressure of the hydraulic oil input into the brake cylinder 3, so as to ensure the working pressure of the brake cylinder 3 and improve the reliability of the system, and when the pressure switch 6 detects that the pressure of the rod cavity of the input brake cylinder 3 is abnormal, the pressure switch can inform the operator in a manner of giving an alarm or the like, so that the operator can determine the fault of the hydraulic parking brake system of the electric forklift accordingly, so as to perform fault processing in time.
In order to avoid the backflow of the hydraulic oil in the brake cylinder 3 from the brake valve block 5 to the CF port of the priority valve 2, on the basis of the above embodiment, a second check valve 54 is disposed between the oil supply end of the brake oil path 4 and the oil inlet of the brake valve block 5, and is used for preventing the hydraulic oil of the brake valve block 5 from flowing back to the oil supply end of the brake oil path 4 and further flowing back to the CF port of the priority valve 2.
In consideration of the implementation of the specific structure of the main oil supply path 1, on the basis of the above-described embodiments, the main oil supply path 1 includes the oil pump 11 and the hydraulic oil tank 12, and the oil discharge port of the oil pump 11 is connected to the oil inlet of the priority valve 2 to supply the pressure oil to the priority valve 2; the hydraulic oil tank 12 is connected to an oil inlet of the oil pump 11 and is used for supplying oil to the oil pump 11.
In order to prevent impurities and the like from entering the oil pump 11, a filter 13 is provided between the oil pump 11 and the hydraulic oil tank 12 in addition to the above-described embodiment.
In addition to the above-mentioned hydraulic parking brake system for an electric forklift, the present invention also provides an electric forklift including the hydraulic parking brake system for an electric forklift disclosed in the above-mentioned embodiments, and the structures of other parts of the electric forklift refer to the prior art, which is not described herein again.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The hydraulic parking brake system for the electric forklift and the electric forklift provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides an electric fork truck hydraulic pressure parking braking system which characterized in that includes:
the main oil supply way (1) is provided with a priority valve (2), a CF port of the priority valve (2) is used for being connected with an oil inlet of a steering gear (7) of the forklift, and an EF port of the priority valve (2) is used for being connected with an oil inlet of a multi-way valve (8) of a forklift working system;
a brake cylinder (3) for parking and braking the forklift;
a brake oil path (4) used for providing hydraulic oil for the brake cylinder (3), wherein the oil supply end of the brake oil path (4) is connected with the CF port;
and the brake valve block (5) is arranged on the brake oil path (4), and the brake valve block (5) is used for controlling the brake cylinder (3) to act so that the brake cylinder (3) can perform parking brake on the forklift or the brake cylinder (3) is in an unlocked state.
2. The hydraulic parking brake system of the electric forklift according to claim 1, wherein the brake cylinder (3) is a single-rod single-action hydraulic cylinder, an oil inlet of the brake valve block (5) is connected with the oil supply end, a working oil port of the brake valve block (5) is connected with a rod cavity of the brake cylinder (3), and an oil return port of the brake valve block (5) is connected with an oil return tank;
when an oil inlet of the brake valve block (5) is communicated with a working oil port of the brake valve block, the brake cylinder (3) is in the unlocking state; when an oil return port of the brake valve block (5) is communicated with a working oil port of the brake valve block, the brake cylinder (3) performs parking brake on the forklift under the action of self spring force.
3. The electric forklift hydraulic parking brake system according to claim 2, wherein the brake valve block (5) comprises a two-position three-way solenoid valve (51), an oil inlet of the two-position three-way solenoid valve (51) is connected with the oil supply end, a working oil port of the two-position three-way solenoid valve (51) is connected with the rod cavity, and an oil return port of the two-position three-way solenoid valve (51) is connected with the oil return tank.
4. The hydraulic parking brake system of the electric forklift as claimed in claim 3, wherein the brake valve block (5) further comprises a pressure reducing valve (52) connected in series with the two-position three-way solenoid valve (51), and a working oil port of the two-position three-way solenoid valve (51) is connected with the rod cavity through the pressure reducing valve (52).
5. The electric fork lift hydraulic parking brake system of claim 4, wherein the brake valve block (5) further comprises a first check valve (53) arranged in parallel with the pressure reducing valve (52) for returning the oil of the rod chamber to the two-position three-way solenoid valve (51).
6. The electric fork lift hydraulic parking brake system of any one of claims 1-5, further comprising a pressure switch (6) for detecting whether the pressure of the hydraulic oil entering the brake cylinder (3) is up to standard.
7. The electric fork lift hydraulic parking brake system as recited in claim 6, characterized in that a second check valve (54) is disposed between the oil supply end and the oil inlet of the brake valve block (5) for preventing oil of the brake valve block (5) from flowing back to the CF port.
8. The electric fork lift hydraulic parking brake system of claim 6, wherein the main oil supply circuit (1) comprises:
the oil pump (11) is used for being connected with the oil inlet of the priority valve (2);
and a hydraulic oil tank (12) connected to the oil pump (11) and configured to supply oil to the oil pump (11).
9. Hydraulic parking brake system for electric fork-lift trucks according to claim 8, characterized in that a filter (13) is provided between the oil pump (11) and the hydraulic oil tank (12).
10. An electric forklift comprising a parking brake system, characterized in that the parking brake system is an electric forklift hydraulic parking brake system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010130197.6A CN111153354A (en) | 2020-02-28 | 2020-02-28 | Electric fork-lift hydraulic parking braking system and electric fork-lift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010130197.6A CN111153354A (en) | 2020-02-28 | 2020-02-28 | Electric fork-lift hydraulic parking braking system and electric fork-lift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111153354A true CN111153354A (en) | 2020-05-15 |
Family
ID=70566695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010130197.6A Pending CN111153354A (en) | 2020-02-28 | 2020-02-28 | Electric fork-lift hydraulic parking braking system and electric fork-lift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111153354A (en) |
-
2020
- 2020-02-28 CN CN202010130197.6A patent/CN111153354A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102951198B (en) | A kind of vehicle and fluid-link steering drive system | |
| CN108317112B (en) | Fork truck duplex pump turns to parking braking and releases hydraulic system | |
| CN201745568U (en) | Heavy mineral dump truck brake control system | |
| CN202482016U (en) | Diesel fork lift truck hydraulic system with safety protection mechanism | |
| CN113183816A (en) | Battery pack quick-changing and locking system of electric heavy truck | |
| CN104061193B (en) | The drum brake hydraulic system of multi-axle heavy type engineering machinery | |
| CN103144566B (en) | A kind of large-tonnage highway quarry tipper lifting hydraulic system | |
| CN114940467B (en) | Electro-hydraulic composite forklift and driving system, method and device thereof as well as storage medium | |
| CN203611976U (en) | Hydraulic travel emergency brake system for engineering machinery | |
| CN102059973B (en) | Lifting hydraulic integrated system for large-tonnage electric-wheel mining dumper | |
| CN211594929U (en) | Electric fork-lift hydraulic parking braking system and electric fork-lift | |
| CN111153354A (en) | Electric fork-lift hydraulic parking braking system and electric fork-lift | |
| CN202046853U (en) | Safeguard hydraulic system for storage battery forklift | |
| CN208978826U (en) | Brake fluid system and vehicle | |
| CN216994270U (en) | Hydraulic control valve group and trailer hydraulic braking system and tractor comprising same | |
| CN216767923U (en) | Pilot control device and mining dump truck lifting system thereof | |
| CN216546137U (en) | Emergent oil feeding system and loader | |
| CN210423191U (en) | Hook arm car hydraulic system based on load self-adaptation | |
| CN211231051U (en) | Unmanned operation automatic control forklift brake hydraulic system | |
| CN214274081U (en) | Power unit of garbage compression truck | |
| CN214274083U (en) | Hydraulic auxiliary control system of mixer truck and hydraulic control system of mixer truck | |
| CN111038579B (en) | Control device for steering control valve bank of electrically-driven chassis | |
| CN110541856B (en) | Unmanned automatic control's fork truck braking hydraulic system | |
| CN113653690A (en) | Hydraulic control system capable of realizing multiple emergency functions and road roller | |
| CN221251131U (en) | Fork truck hydraulic braking system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |