CN211195969U - Electric control gas pilot hydraulic system for dump truck - Google Patents
Electric control gas pilot hydraulic system for dump truck Download PDFInfo
- Publication number
- CN211195969U CN211195969U CN201922165018.8U CN201922165018U CN211195969U CN 211195969 U CN211195969 U CN 211195969U CN 201922165018 U CN201922165018 U CN 201922165018U CN 211195969 U CN211195969 U CN 211195969U
- Authority
- CN
- China
- Prior art keywords
- valve
- hydraulic
- air
- gas
- air valve
- 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.)
- Active
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model discloses a self-discharging is pneumatic guide's hydraulic system of electricity accuse for car, including hydraulic pump, two tee bend electromagnetic air valves, pressure regulating pneumatic valve, gas accuse proportion hydraulic pressure distributing valve, multistage pneumatic cylinder, spacing pneumatic valve, hydraulic tank and pipeline. The pilot control gas circuits on two sides of the pneumatic control proportional hydraulic distribution valve are respectively controlled by a two-position three-way electromagnetic gas valve, three actions of lifting, stopping and descending of a carriage of the dump truck can be realized, the lifting and descending actions can be controlled by a pressure regulating gas valve to realize speed regulation, and the electric control gas pilot hydraulic system is a simple serial loop design, can realize an electric control function and simultaneously greatly reduce the cost and is simple and easy to operate in loop connection compared with a complex parallel connection type channel or a manual control loop.
Description
Technical Field
The utility model belongs to the technical field of hydraulic pressure for the dump truck, especially, relate to a dump truck is with electronic control gas guide's hydraulic system.
Background
A dump truck is a vehicle that unloads goods by itself by hydraulic or mechanical pushing, and is commonly used in the transportation fields of minerals, engineering, sludge, garbage and the like. The dump truck is divided into a lifting unloading type, a horizontal pushing unloading type and the like according to the unloading form. At present, lifting type dump trucks are mainly applied in the market, and a manual control gas pilot hydraulic system is matched with a product standard. After long-term optimization and upgrade, the system has the advantages of stable technology, comprehensive functions, intensive structure and reliable work.
The principle of the manual control air pilot hydraulic system for the dump truck is shown in figure 1. The system is composed of a hydraulic pump 1, a manual control proportional air valve 10, a pneumatic control proportional hydraulic distribution valve 2, a multi-stage hydraulic cylinder 4, a limiting air valve 3, a hydraulic oil tank 7, a pipeline and the like. The control principle is that a user directly operates the manual control proportional air valve to push the valve core of the air valve to move, the lifting or descending side control air circuit of the pneumatic control proportional hydraulic distribution valve is conducted to push the valve core of the distribution valve to move, the oil circuit of the multi-stage hydraulic cylinder is conducted, and finally lifting or descending of the carriage is achieved. When the carriage reaches a set angle during lifting, the limiting air valve is triggered to push the air valve core to move, the lifting side control air circuit of the pneumatic control proportional hydraulic distribution valve is cut off, and finally the carriage stops lifting. When the car descends, a user can control the opening of the manual control proportional air valve, the descending side control air pressure of the pneumatic control proportional hydraulic distribution valve is reduced, the valve core of the distribution valve is in a small opening, the oil return speed of the multi-stage hydraulic cylinder is limited, and finally the car descends slowly.
The problems existing at present are as follows: due to the principle limitation of the existing manual control gas pilot hydraulic system, the control mode can only be operated by manpower. With the emergence of high-speed internet and unmanned automatic driving technology, the demands of remote control unloading and automatic control unloading technology for the dumper are promoted. This requires that the hydraulic system must be electrically controllable on the basis of ensuring technical stability, reliable operation and cost control.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a realize through following technical scheme:
an electric control gas pilot hydraulic system for a dump truck is used for controlling the lifting and descending of a carriage of the dump truck and comprises a hydraulic lifting device and a gas circuit control device for controlling the working state of the hydraulic lifting device; the hydraulic lifting device comprises a hydraulic oil tank, a hydraulic pump and a pneumatic control proportional hydraulic distribution valve which are communicated with the interior of the hydraulic oil tank through an oil pipe, and a multi-stage hydraulic cylinder which is communicated with the pneumatic control proportional hydraulic distribution valve through an oil pipe, wherein the multi-stage hydraulic cylinder is used for lifting and lowering a carriage; the gas circuit control device comprises a gas source, a group of two-position three-way electromagnetic gas valves communicated with the gas source through gas pipes, and a limit gas valve communicated with one two-position three-way electromagnetic gas valve through the gas pipes, wherein the other two-position three-way electromagnetic gas valve and the limit gas valve are both communicated with a gas control proportional hydraulic distribution valve through the gas pipes;
after a two-position three-way electromagnetic air valve communicated with the limiting air valve is electrified, controlling air to enter a pneumatic control proportional hydraulic distribution valve and switch the working state of the pneumatic control proportional hydraulic distribution valve, so that hydraulic oil in a hydraulic oil tank flows to a multi-stage hydraulic cylinder under the action of a hydraulic pump to lift a carriage; the limiting air valve is used for relieving pressure after being lifted to the proper position, so that the pneumatic control proportional hydraulic distribution valve returns to the middle position and is kept;
after the two-position three-way electromagnetic air valve which is not communicated with the limiting air valve is electrified, the control air enters the air control proportional hydraulic distribution valve and switches the working state of the air control proportional hydraulic distribution valve, so that the hydraulic oil in the multi-stage hydraulic cylinder flows back to the hydraulic oil tank under the action of gravity, and the carriage is lowered.
Optionally, the two-position three-way electromagnetic air valve is set as a two-position three-way normally-closed electromagnetic air valve, a port P of the two-position three-way normally-closed electromagnetic air valve is connected with the air source, a port a is connected with the air control proportional hydraulic distribution valve, and a port R is connected with the exhaust pipe, and when power is on, a port P, A is connected, and when power is off, a port A, R is connected.
Optionally, the two-position three-way electromagnetic air valve is set as a two-position three-way normally-open electromagnetic air valve, a P port of the two-position three-way normally-open electromagnetic air valve is connected with the exhaust pipe, an a port of the two-position three-way normally-open electromagnetic air valve is connected with the pneumatic control proportional hydraulic distribution valve, and an R port of the two-position three-way normally-open electromagnetic air valve is connected with the air source, and when power is on, a A, R.
Optionally, the electrically controlled gas pilot hydraulic system further includes a manual control proportional gas valve connected between the gas source and the two-position three-way electromagnetic gas valve, and is configured to manually control gas to enter the pneumatic control proportional hydraulic distribution valve and switch the working state of the pneumatic control proportional hydraulic distribution valve.
Optionally, the electric control gas pilot hydraulic system further comprises a pressure regulating gas valve for regulating pilot gas pressure, and the pressure regulating gas valve is connected to a gas pipe between the gas source and the two three-way electromagnetic gas valves.
Optionally, the above-mentioned electrically controlled pneumatic pilot hydraulic system further includes an inclination sensor for monitoring the lift angle in real time.
Optionally, the electrically controlled pneumatic pilot hydraulic system further includes a proximity switch for detecting that the multi-stage hydraulic cylinder is lifted to the target position.
Compared with the prior art, the utility model discloses following profitable technological effect has:
1. two-position three-way electromagnetic air valves are adopted and connected to form an electric control air pilot control loop; compared with a complex parallel connection type access or a manual control loop, the serial connection type loop has the advantages that the cost is greatly reduced while the electric control function can be realized, and meanwhile, the loop connection is simple and easy to operate.
2. The pressure regulating air valve is arranged on the air guide path for controlling descending or the main air supply path for controlling lifting and descending, so that the control pressure can be adjusted, and the oil cylinder can slowly fall back.
Drawings
FIG. 1 is a schematic diagram of a manual air pilot hydraulic system;
FIG. 2 is a schematic diagram of an electrically controlled pneumatic pilot hydraulic system;
fig. 3 is a schematic diagram of a further improved electrically controlled hydraulic system.
Description of the reference numerals
In the figure: the hydraulic control system comprises a hydraulic pump 1, a pneumatic control proportional hydraulic distribution valve 2, a limiting air valve 3, a multi-stage hydraulic cylinder 4, a two-position three-way normally-closed electromagnetic air valve 5, a pressure regulating air valve 6, a hydraulic oil tank 7, a two-position three-way normally-open electromagnetic air valve 8 and a manual control proportional air valve 10.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," "assembled," "connected," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 2, an electric control gas pilot hydraulic system for a dump truck is used for controlling the lifting and descending of a carriage of the dump truck, and comprises a hydraulic lifting device and a gas circuit control device for controlling the working state of the hydraulic lifting device; the hydraulic lifting device comprises a hydraulic oil tank 7, a hydraulic pump 1 and a pneumatic control proportional hydraulic distribution valve 2 which are communicated with the interior of the hydraulic oil tank 7 through oil pipes, and a multi-stage hydraulic cylinder 4 which is communicated with the pneumatic control proportional hydraulic distribution valve 2 through oil pipes, wherein the multi-stage hydraulic cylinder 4 is used for lifting and lowering a carriage; the gas path control device comprises a gas source, a group of two-position three-way normally-closed electromagnetic gas valves 5 communicated with the gas source through gas pipes, and a limiting gas valve 3 communicated with one of the two-position three-way normally-closed electromagnetic gas valves 5 through the gas pipes, wherein the other two-position three-way normally-closed electromagnetic gas valve 5 and the limiting gas valve 3 are both communicated with a gas control proportional hydraulic distribution valve 2 through the gas pipes;
the P port of the two-position three-way normally closed electromagnetic air valve 5 is connected with an air source, the A port is connected with the air control proportional hydraulic distribution valve 2, and the R port is connected with an exhaust pipe, wherein when power is on, the P, A port is communicated, and when power is off, the A, R port is communicated.
After a two-position three-way normally closed electromagnetic air valve 5 communicated with the limiting air valve 3 is electrified, control air enters an air control proportional hydraulic distribution valve 2 and switches the working state of the air control proportional hydraulic distribution valve, so that hydraulic oil in a hydraulic oil tank 7 flows to a multi-stage hydraulic cylinder 4 under the action of a hydraulic pump 1 to lift a carriage; the limiting air valve 3 is used for relieving pressure after being lifted to the proper position, so that the air control proportional hydraulic distribution valve 2 returns to the middle position and is kept;
after the two-position three-way normally closed electromagnetic air valve 5 which is not communicated with the limiting air valve 3 is electrified, the control air enters the air control proportional hydraulic distribution valve 2 and switches the working state of the air control proportional hydraulic distribution valve, so that the hydraulic oil in the multi-stage hydraulic cylinder 4 flows back to the hydraulic oil tank 7 under the action of gravity, and the carriage is lowered.
The working principle of the electric control gas pilot hydraulic system is as follows:
when the hydraulic system does not operate, the electromagnets DT1 and DT2 of the electromagnetic air valve 5 are not powered, the pneumatic control proportional hydraulic distribution valve 2 keeps a middle position, and the system is in an unloading low-energy consumption state.
When the dump truck needs to lift the carriage, the electromagnet DT1 of the electromagnetic air valve 5 communicated with the limiting air valve 3 is electrified (DT2 is not electrified), the valve core of the air valve is switched to the left position, the P, A port is communicated, control air enters the right control cavity of the pneumatic control proportional hydraulic distribution valve 2 to push the valve core of the distribution valve to be switched to the right position, the high-pressure oil port is communicated with the working port, and pressure oil pushes the multi-stage hydraulic cylinder 4 to extend out to jack the carriage. When the carriage is lifted to a set angle, the limiting air valve 3 is triggered, the valve core of the air valve is switched to the right position, the pressure of the control cavity on the right side of the pneumatic control proportional hydraulic distribution valve 2 is relieved, the valve core of the distribution valve returns to the middle position, and the carriage stops rising and is kept.
When the carriage of the dump truck needs to descend, the electromagnet DT2 of the electromagnetic air valve 5 which is not communicated with the limiting air valve 3 is electrified (DT1 is not electrified), the valve core of the air valve is switched to the left position, the P, A port is communicated, control air enters the left control cavity of the pneumatic control proportional hydraulic distribution valve 2 to push the valve core of the distribution valve to be switched to the left position, the oil return port is communicated with the working port, and the multi-stage hydraulic cylinder 4 retracts under the action of gravity to put down the carriage.
Example 2
As shown in fig. 3, an electrically controlled pneumatic pilot hydraulic system for a dump truck is used for controlling the lifting and lowering of a carriage of the dump truck, and includes a hydraulic lifting device and a pneumatic control device for controlling the working state of the hydraulic lifting device, wherein in the pneumatic control device, a two-position three-way normally closed electromagnetic valve 5 in embodiment 1 is replaced with a two-position three-way normally open electromagnetic valve 8, and the rest is the same as that in embodiment 1;
the P port of the two-position three-way normally-open type electromagnetic air valve 8 is connected with an exhaust pipe, the A port is connected with the pneumatic control proportional hydraulic distribution valve 2, and the R port is connected with an air source, when power is on, the A, R port is communicated, and when power is off, the P, A port is communicated.
The working principle of the electric control gas pilot hydraulic system is as follows:
the electric control pilot gas supply circuit is connected with the R port of the electromagnetic gas valve 8 and is in a cut-off state when not working;
when the hydraulic system does not operate, the electromagnets DT1 and DT2 of the electromagnetic air valve 8 are not powered, the pneumatic control proportional hydraulic distribution valve 2 keeps a middle position, and the system is in an unloading low-energy consumption state.
When the dump truck needs to lift the carriage, the electromagnet DT1 of the electromagnetic air valve 8 communicated with the limiting air valve 3 is electrified (DT2 is not electrified), the valve core of the air valve is switched to the left position, the A, R port is communicated, control air enters the right control cavity of the pneumatic control proportional hydraulic distribution valve 2 to push the valve core of the distribution valve to be switched to the right position, the high-pressure oil port is communicated with the working port, and pressure oil pushes the multi-stage hydraulic cylinder 4 to extend out to jack the carriage. When the carriage is lifted to a set angle, the limiting air valve 3 is triggered, the valve core of the air valve is switched to the right position, the pressure of the control cavity on the right side of the pneumatic control proportional hydraulic distribution valve 2 is relieved, the valve core of the distribution valve returns to the middle position, and the carriage stops rising and is kept.
When the carriage of the dump truck needs to descend, the electromagnet DT2 of the electromagnetic air valve 8 which is not communicated with the limiting air valve 3 is electrified (DT1 is not electrified), the valve core of the air valve is switched to the left position, the A, R port is communicated, control air enters the left control cavity of the pneumatic control proportional hydraulic distribution valve 2 to push the valve core of the distribution valve to be switched to the left position, the oil return port is communicated with the working port, and the multi-stage hydraulic cylinder 4 retracts under the action of gravity to put down the carriage.
The electrically controlled pneumatic pilot hydraulic system in embodiment 2 may further include a manual proportional air valve 10 connected between the air source and the two-position three-way electromagnetic air valve, and configured to manually control air to enter the pneumatically controlled proportional hydraulic distribution valve 2 and switch the working state thereof, and the manually controlled pneumatic pilot hydraulic system may be used as an emergency function, may be disposed inside a cab, and is convenient for a user to control timely and safely.
The gas control pilot hydraulic system in the embodiment 1 or 2 may further include a pressure regulating air valve 6 for regulating pilot air pressure, and the pressure regulating air valve 6 is connected to an air pipe between the air source and the two-position three-way electromagnetic air valve; the pressure regulating air valve 6 can manually set descending pilot air pressure to a proper value in advance, the air pressure is reduced to enable the left position of the pneumatic control proportional hydraulic distribution valve 2 to be in an incomplete opening degree when working, a throttling effect is formed, the descending speed is reduced, the impact of falling to the position is reduced,
the control form of the pressure regulating air valve 6 can be adjustable, and is not limited to manual adjustment or electric proportion adjustment, and the arrangement position can be on a pilot air channel for controlling descending action or a main air supply channel for controlling lifting and descending action; when the carriage descends, the descending speed can be dynamically adjusted according to the angle real-time monitoring condition, and the good descending stability of the carriage is kept.
The air control pilot hydraulic system in the above embodiment 1 or 2 may further include a lifting angle real-time monitoring element, such as an inclination sensor, for real-time sensing and controlling of the electric control system of the entire vehicle.
The pilot hydraulic system for controlling air in embodiment 1 or 2 may further include an electronic detecting element for lifting to the place, such as a proximity switch and a travel switch, to form a closed-loop control system, and feed back an in-place signal to cut off the electromagnetic air valve.
Under the condition that the system principle is not violated, each element of the two-position three-way electromagnetic air valve, the pressure regulating air valve and the pneumatic control proportional hydraulic distribution valve can be independently and separately designed and arranged, and can also be freely combined and integrated.
The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical features of the technical solution of the present invention by those skilled in the art all belong to the protection scope of the present invention.
Claims (7)
1. The utility model provides a self-discharging is electronic control gas guide hydraulic system for car for control lifting and descending of tipper carriage, its characterized in that: the hydraulic lifting device comprises a hydraulic lifting device and a gas circuit control device for controlling the working state of the hydraulic lifting device; the hydraulic lifting device comprises a hydraulic oil tank (7), a hydraulic pump (1) and a pneumatic control proportional hydraulic distribution valve (2) which are communicated with the hydraulic oil tank (7) through oil pipes, and a multistage hydraulic cylinder (4) which is communicated with the pneumatic control proportional hydraulic distribution valve (2) through oil pipes, wherein the multistage hydraulic cylinder (4) is used for lifting and lowering a carriage; the gas circuit control device comprises a gas source, a group of two-position three-way electromagnetic gas valves communicated with the gas source through gas pipes, and a limit gas valve (3) communicated with one two-position three-way electromagnetic gas valve through the gas pipes, wherein the other two-position three-way electromagnetic gas valve and the limit gas valve (3) are both communicated with a gas control proportion hydraulic distribution valve (2) through the gas pipes;
after a two-position three-way electromagnetic air valve communicated with the limiting air valve (3) is electrified, control air enters an air control proportional hydraulic distribution valve (2) and switches the working state of the air control proportional hydraulic distribution valve, so that hydraulic oil in a hydraulic oil tank (7) flows to a multi-stage hydraulic cylinder (4) under the action of a hydraulic pump (1) to lift a carriage; the limiting air valve (3) is used for releasing pressure after being lifted to the proper position, so that the air control proportional hydraulic distribution valve (2) returns to the middle position and is kept;
after a two-position three-way electromagnetic air valve which is not communicated with the limiting air valve (3) is electrified, control air enters the pneumatic control proportional hydraulic distribution valve (2) and switches the working state of the pneumatic control proportional hydraulic distribution valve, so that hydraulic oil in the multi-stage hydraulic cylinder (4) flows back to the hydraulic oil tank (7) under the action of gravity, and the carriage is lowered.
2. The electrically controlled pilot hydraulic system for a dump truck according to claim 1, wherein: the two-position three-way electromagnetic air valve is set as a two-position three-way normally-closed electromagnetic air valve (5), a P port of the two-position three-way normally-closed electromagnetic air valve (5) is connected with an air source, an A port is connected with the air control proportional hydraulic distribution valve (2), an R port is connected with an exhaust pipe, when power is on, a P, A port is conducted, and when power is off, a A, R port is conducted.
3. The electrically controlled pilot hydraulic system for a dump truck according to claim 1, wherein: the two-position three-way electromagnetic air valve is set as a two-position three-way normally-open electromagnetic air valve (8), a P port of the two-position three-way normally-open electromagnetic air valve (8) is connected with an exhaust pipe, an A port is connected with a pneumatic control proportional hydraulic distribution valve (2), and an R port is connected with an air source, and when power is on, an A, R port is conducted, and when power is off, a P, A port is conducted.
4. The electrically controlled pilot hydraulic system for a dump truck according to claim 3, wherein: the pneumatic control type three-way electromagnetic air valve also comprises a manual control proportional air valve (10) connected between the air source and the two-position three-way electromagnetic air valve and used for manually controlling air to enter the pneumatic control proportional hydraulic distribution valve (2) and switching the working state of the pneumatic control proportional hydraulic distribution valve.
5. The electrically controlled pilot hydraulic system for a dump truck according to any one of claims 1 to 4, wherein: the pneumatic control system is characterized by further comprising a pressure regulating air valve (6) used for regulating pilot air pressure, wherein the pressure regulating air valve (6) is connected to an air pipe between the air source and the two-position three-way electromagnetic air valve.
6. The electrically controlled pilot hydraulic system for a dump truck according to any one of claims 1 to 4, wherein: the device also comprises an inclination angle sensor used for monitoring the lifting angle in real time.
7. The electrically controlled pilot hydraulic system for a dump truck according to any one of claims 1 to 4, wherein: the multi-stage hydraulic cylinder lifting device also comprises a proximity switch used for detecting that the multi-stage hydraulic cylinder (4) is lifted to the right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922165018.8U CN211195969U (en) | 2019-12-06 | 2019-12-06 | Electric control gas pilot hydraulic system for dump truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922165018.8U CN211195969U (en) | 2019-12-06 | 2019-12-06 | Electric control gas pilot hydraulic system for dump truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211195969U true CN211195969U (en) | 2020-08-07 |
Family
ID=71862971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922165018.8U Active CN211195969U (en) | 2019-12-06 | 2019-12-06 | Electric control gas pilot hydraulic system for dump truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211195969U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112455309A (en) * | 2020-12-08 | 2021-03-09 | 安徽江淮汽车集团股份有限公司 | Lock hook misoperation prevention control circuit and device for dump truck and dump truck |
| CN112918359A (en) * | 2019-12-06 | 2021-06-08 | 陕西汽车集团有限责任公司 | Electric control gas pilot hydraulic system for dump truck |
-
2019
- 2019-12-06 CN CN201922165018.8U patent/CN211195969U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112918359A (en) * | 2019-12-06 | 2021-06-08 | 陕西汽车集团有限责任公司 | Electric control gas pilot hydraulic system for dump truck |
| CN112455309A (en) * | 2020-12-08 | 2021-03-09 | 安徽江淮汽车集团股份有限公司 | Lock hook misoperation prevention control circuit and device for dump truck and dump truck |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211195969U (en) | Electric control gas pilot hydraulic system for dump truck | |
| CN101775822B (en) | Excavator swing arm descending hydraulic control loop | |
| CN102384113B (en) | Oil supply and energy-saving device for mining dump truck | |
| CN201694021U (en) | Floating bridge no-load automatic lifting control device | |
| CN110219332B (en) | Swing arm mechanism gravity counteracting device of excavator | |
| CN204055499U (en) | Dumping car and hoisting system thereof | |
| CN112918359A (en) | Electric control gas pilot hydraulic system for dump truck | |
| CN106976825A (en) | Bypass the scissor aerial work platform hydraulic control system of off-load electromagnetic direct-drive | |
| CN105235575A (en) | Self-dumping vehicle and lifting system thereof | |
| CN107150905B (en) | Material sucking device, powder tank truck with same and material sucking method | |
| CN201753040U (en) | Packing case lifting safety control device | |
| CN104149573A (en) | Air suspension leveling control system automatically ascending and descending | |
| CN106194894B (en) | A kind of hydrocylinder buffering device | |
| CN109017726A (en) | A kind of automatic driving vehicle general brake system and control method | |
| CN210423211U (en) | Hydraulic control valve group for AGV (automatic guided vehicle) forklift and hydraulic control system for AGV forklift | |
| CN204569197U (en) | A kind of driver's cab moveable front hoisting crane | |
| CN217102959U (en) | Hydraulic system for controlling speed of working limit position of lifting oil cylinder and heavy forklift | |
| CN201736993U (en) | Air pipeline control device for switching mechanism of railroad hopper wagon | |
| CN201121117Y (en) | Hydraulic speed regulating device for fork truck lift | |
| CN100344517C (en) | Unloading machine having energy-storage function | |
| CN2786060Y (en) | Car unloader with energy-saving function | |
| CN109604341A (en) | Punch and its big lid lifting locking control system | |
| CN105179350B (en) | Valve block assembly of three-way type lifting hydraulic system for dump truck | |
| CN211335699U (en) | Electric control gas circuit hydraulic assembly, electric control lifting system and unmanned mine car | |
| CN209890194U (en) | Forklift lifting hydraulic control system and forklift |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 710200 Jingwei Industrial Park, economic development zone, Xi'an City, Shaanxi Province Patentee after: Shaanxi Automobile Group Co.,Ltd. Address before: 710200 Jingwei Industrial Park, Xi'an Economic and Technological Development Zone, Shaanxi Province Patentee before: SHAANXI AUTOMOBILE GROUP Co.,Ltd. |
|
| CP03 | Change of name, title or address |