CN111732033A - Diesel fork truck steering system and diesel fork truck - Google Patents
Diesel fork truck steering system and diesel fork truck Download PDFInfo
- Publication number
- CN111732033A CN111732033A CN202010725636.8A CN202010725636A CN111732033A CN 111732033 A CN111732033 A CN 111732033A CN 202010725636 A CN202010725636 A CN 202010725636A CN 111732033 A CN111732033 A CN 111732033A
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- CN
- China
- Prior art keywords
- oil
- steering
- emergency
- oil pump
- valve
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- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07568—Steering arrangements
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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
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/24—Electrical devices or systems
Abstract
The invention discloses a steering system of a diesel fork lift truck, which comprises an oil tank, a main working oil pump, a priority valve, a full hydraulic steering gear and a steering oil cylinder which are sequentially connected, and further comprises an emergency steering device, wherein an oil inlet of the emergency steering device is connected with the oil tank, an oil outlet of the emergency steering device is connected with an oil inlet of the full hydraulic steering gear, the emergency steering device comprises an emergency oil pump and a motor for driving the emergency oil pump, and the motor is connected with a storage battery of the diesel fork lift truck. When the engine fails and the like, the motor can be started, and then the emergency oil pump provides pressure for the full hydraulic steering gear, so that the steering function of the forklift is continuously realized, the potential safety hazard caused by the sudden failure of the conventional steering function is avoided, and meanwhile, when the forklift stops and needs to be towed, the emergency steering device can be manually controlled, and the steering function of the forklift is realized. The invention also discloses a diesel fork lift truck comprising the system.
Description
Technical Field
The invention relates to the field of forklift equipment, in particular to a steering system of a diesel fork lift truck. In addition, the invention also relates to a diesel fork lift truck comprising the system.
Background
The diesel fork lift truck has good transportation performance, is widely applied to various production and transportation workshops, ensures the transportation effect, and completes the actions of steering, braking and the like through the driving of a hydraulic system. Especially for large-tonnage diesel forklifts, the self weight is great, the inertia is large, and if a fault occurs in the driving process to cause failure of a steering system, the forklifts cannot steer in time, so that serious consequences can be caused.
Meanwhile, when the vehicle is out of order due to faults and needs to be dragged, the large-tonnage forklift has large tonnage and large dead weight, and if the vehicle cannot steer, the vehicle can be dragged with great difficulty. The emergency steering function is necessary to be added to the large-tonnage diesel fork truck in consideration of the safety of the fork truck and the like.
Therefore, how to provide a steering system of a diesel fork lift truck capable of emergency steering when the conventional steering fails is a technical problem to be solved by the technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a steering system of a diesel fork lift truck, which realizes emergency steering and improves the safety of the system through an emergency steering device when the conventional steering fails. Another object of the present invention is to provide a fork lift truck comprising the above system.
In order to solve the technical problem, the invention provides a steering system of a diesel fork lift truck, which comprises an oil tank, a main working oil pump, a priority valve, a full hydraulic steering gear, a steering oil cylinder and an emergency steering device, wherein the oil tank, the full hydraulic steering gear and the steering oil cylinder are sequentially connected, an oil inlet of the emergency steering device is connected with the oil tank, an oil outlet of the emergency steering device is connected with an oil inlet of the full hydraulic steering gear, the emergency steering device comprises an emergency oil pump and a motor for driving the emergency oil pump, and the motor is connected with a storage battery of the diesel fork.
Preferably, a first check valve is arranged between the priority valve and the full hydraulic steering gear, so that hydraulic oil can flow from a steering oil port of the priority valve to an oil inlet of the full hydraulic steering gear, and an oil outlet of the emergency steering device is connected with a pipeline between the first check valve and the full hydraulic steering gear.
Preferably, a second one-way valve is arranged at an oil outlet of the emergency oil pump, so that hydraulic oil can flow from the oil outlet of the emergency oil pump to an oil inlet of the full hydraulic steering gear.
Preferably, a safety valve is arranged between the emergency oil pump and the second one-way valve.
Preferably, the emergency oil pump is embodied as a fixed displacement pump.
Preferably, a pressure switch is provided between the priority valve and the first check valve.
Preferably, the device further comprises a liquid charging oil pump, a liquid charging valve and an accumulator which are connected in sequence.
Preferably, the accumulator is connected to a pipeline between the first check valve and the full hydraulic steering gear through a stop valve.
Preferably, the main working oil pump is connected with the oil tank through a main oil filter, the emergency oil pump is connected with the oil tank through an emergency oil filter, and the charging oil pump is connected with the oil tank through a charging oil filter.
The invention provides a diesel fork lift truck, which comprises the steering system of the diesel fork lift truck.
The invention provides a steering system of a diesel fork lift truck, which comprises an oil tank, a main working oil pump, a priority valve, a full hydraulic steering gear, a steering oil cylinder and an emergency steering device, wherein the oil tank is connected with an oil inlet of the emergency steering device, an oil outlet of the emergency steering device is connected with an oil inlet of the full hydraulic steering gear, the emergency steering device comprises an emergency oil pump and a motor for driving the emergency oil pump, and the motor is connected with a storage battery of the diesel fork lift truck.
Under normal operating condition, the hydraulic oil in the oil tank passes through the main working oil pump, the priority valve, the full hydraulic steering gear and the steering oil cylinder in sequence to complete normal steering action, when the engine fails and the like to cause abnormal failure of the conventional steering, the motor can be started, and then the emergency oil pump provides pressure for the full hydraulic steering gear to continue to realize the steering function of the forklift, thereby avoiding the potential safety hazard caused by the sudden failure of the conventional steering function, and simultaneously, when the forklift stops and needs to be towed, the emergency steering device can be manually controlled to realize the steering function during towing.
The invention also provides a diesel fork lift truck comprising the system, and the diesel fork lift truck also has the technical effects due to the technical effects of the system, so that the diesel fork lift truck is not described in detail.
Drawings
FIG. 1 is a hydraulic schematic diagram of one embodiment of a steering system for a fork lift truck according to the present invention;
fig. 2 is a hydraulic schematic diagram of an emergency steering device in an embodiment of the steering system of the diesel fork lift truck provided by the invention.
Detailed Description
The core of the invention is to provide a steering system of the diesel fork lift truck, when the conventional steering fails, the emergency steering is realized through an emergency steering device, and the safety of the system is improved. Another core of the invention is to provide a diesel fork lift truck comprising the above system.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, fig. 1 is a hydraulic schematic diagram of an embodiment of a steering system of a diesel fork lift truck according to the present invention; fig. 2 is a hydraulic schematic diagram of an emergency steering device in an embodiment of the steering system of the diesel fork lift truck provided by the invention.
The invention provides a steering system of an internal combustion forklift truck, which comprises an oil tank 1, a main working oil pump 3, a priority valve 14, a full hydraulic steering gear 10 and a steering oil cylinder 11 which are connected in sequence, wherein the main working oil pump 3 is connected with the oil tank 1 through a main oil filter 4, hydraulic oil output by the main working oil pump 3 enters the priority valve 14 through a port P of the priority valve 14, the priority valve 14 comprises a reversing valve and an overflow valve and is provided with a corresponding port T, a steering oil port CF, a working oil port EF and a hydraulic oil port LS, wherein the oil return port T is connected with the oil tank 1, the working oil port EF is connected with a working oil circuit of the system, the steering oil port CF is connected with the port P of the steering gear 10, the steering gear 10 comprises a reversing valve and is provided with a corresponding port L and a corresponding port R which are respectively connected with two oil ports of the steering oil cylinder 11, the port T of the full hydraulic steering gear 10 is connected with the oil tank 1, this section of tubing is conventional diverted tubing. Wherein the main working oil pump 3 is connected to the PTO port of the gearbox of the diesel lift truck, the gearbox being driven by the engine of the truck, i.e. the driving of the main working oil pump 3 is directly related to the engine state of the truck.
The emergency steering device 2 is further arranged, an oil inlet of the emergency steering device 2 is connected with the oil tank 1, an oil outlet of the emergency steering device 2 is connected with an oil inlet of the full-hydraulic steering device 10, the emergency steering device 2 comprises an emergency oil pump 23 and a motor 21 for driving the emergency oil pump 23, and the motor 21 is connected with a storage battery of the diesel fork lift truck. Further, an emergency oil pump 23 is connected to the oil tank 1 via an emergency oil filter 22.
Under the normal working state, the hydraulic oil in the oil tank 1 enters the main working oil pump 3 after being filtered by the main oil filter 4, the hydraulic oil output by the main working oil pump 3 enters the port P of the priority valve 14, then enters the oil inlet P of the full hydraulic steering gear 10 through the steering oil port CF, finally enters the steering oil cylinder 11 to complete the normal steering action, when the normal steering fails due to the engine failure and the like, the motor 21 can be started through the control of the electrical logic to further drive the emergency oil pump 23 to start, the emergency oil pump 23 absorbs the filtered hydraulic oil through the emergency oil filter 22 and inputs the hydraulic oil to the oil inlet of the full hydraulic steering gear 10, the pressure is provided for the full hydraulic steering gear 10 through the emergency oil pump 23 to continuously realize the steering function of the forklift, thereby avoiding the potential safety hazard caused by the sudden full hydraulic failure of the normal steering function, and simultaneously when the, the emergency steering device can be manually controlled to realize the steering function during the trailer.
In order to improve the stability and reliability of the equipment, a first check valve 12 is arranged between the priority valve 14 and the full hydraulic steering gear 10, that is, the first check valve 12 is respectively connected with a steering oil port CF of the priority valve 14 and an oil inlet of the full hydraulic steering gear 10, and the flow direction of the first check valve 12 is such that hydraulic oil can flow from the steering oil port of the priority valve 14 to the oil inlet of the full hydraulic steering gear 10, thereby preventing the hydraulic oil from flowing back to the priority valve 14. Meanwhile, the oil outlet of the emergency steering device 2 is connected with the pipeline between the first one-way valve 12 and the full hydraulic steering gear 10, so that the hydraulic oil output by the emergency steering device 2 can go to the full hydraulic steering gear 10 and cannot flow to the priority valve 14.
Further, a second one-way valve 25 is arranged at the oil outlet of the emergency oil pump 23, that is, the second one-way valve 25 is respectively connected with the oil outlet of the emergency oil pump 23 and the oil inlet of the full hydraulic steering gear 10, and the flow direction of the second one-way valve 25 is such that hydraulic oil can flow from the oil outlet of the emergency oil pump 23 to the oil inlet of the full hydraulic steering gear 10, thereby preventing hydraulic oil in a conventional steering pipeline from flowing back to the emergency oil pump 23.
In the steering system of the diesel fork lift truck provided by the embodiment of the invention, a safety valve 24 is arranged between an emergency oil pump 23 and a second one-way valve 25, the emergency oil pump 23 is embodied as a fixed displacement pump, and a pressure switch 13 is arranged between a priority valve 14 and a first one-way valve 12. The motor 21 is operated under the logical control of an electrical system, the set pressure value of the safety valve 24 is fixed, and different pressure adjustments can be performed according to different vehicle types, so that the requirements of different tonnages are met, but the maximum pressure cannot exceed the rated working pressure of the emergency oil pump 23, so that the emergency oil pump 23 is protected. The required fluid of emergency steering gear 2 comes from fork truck's hydraulic tank 1, and the relief valve 24 is opened the back hydraulic oil and also directly flows into fork truck's oil tank 1, need not set up hydraulic tank alone for emergency steering gear 2 in addition. The pressure switch 13 is connected in the conventional steering pipeline and used for detecting the pressure value of the steering system, converting the pressure value into an electric signal and accessing the electric system as the basis of logical judgment and control of the electric system.
On the basis of the steering system of the diesel fork lift truck provided by each specific embodiment, a liquid charging oil pump 5, a liquid charging valve 7 and an energy accumulator 8 which are connected in sequence are further arranged. Part fork truck will adopt wet braking, consequently will be provided with energy storage ware 8, and the oil inlet of liquid filling oil pump 5 passes through liquid filling oil filter 6 and connects oil tank 1, and the oil-out of liquid filling oil pump 5 is connected with the P mouth of prefill valve 7, and N mouth of prefill valve 7 is connected other working oil circuit of fork truck, and the S mouth of prefill valve 7 is connected energy storage ware 8, and the T mouth of prefill valve 7 connects oil tank 1 oil return, and energy storage ware 8 is connected with fork truck braking through the pipeline.
Further, the accumulator 8 is connected to the line between the first non return valve 12 and the full hydraulic steering gear 10 via a shut-off valve 9. The energy accumulator 8 is also used as another power source for steering, under the severe condition of certain limits, the conventional steering function of the forklift fails, when the emergency steering device 2 cannot work when the forklift stops, the stop valve 9 can be manually opened at the moment, the energy accumulator 8 supplies oil for the steering system, the emergency function can be exerted at the moment, and when the forklift is dragged away, the steering function can be realized.
In addition to the above-mentioned steering system of the diesel fork lift truck, a specific embodiment of the present invention further provides a diesel fork lift truck including the above-mentioned steering system of the diesel fork lift truck, and the structure of other parts of the diesel fork lift truck refers to the prior art, and is not described herein again.
The above detailed description is made of the steering system of the diesel fork lift truck and the diesel fork lift truck provided by the invention. 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 a fork truck a steering system, is including oil tank (1), main working oil pump (3), priority valve (14), full hydraulic steering ware (10) and steering cylinder (11) that connect gradually, its characterized in that still includes emergent steering device (2), the oil inlet of emergent steering device (2) is connected oil tank (1), the oil-out of emergent steering device (2) is connected the oil inlet of full hydraulic steering ware (10), emergent steering device (2) are including emergent oil pump (23) and drive motor (21) of emergent oil pump (23), fork truck's battery is connected in motor (21).
2. The forklift steering system according to claim 1, wherein a first check valve (12) is arranged between the priority valve (14) and the full hydraulic steering gear (10) to enable hydraulic oil to flow from a steering oil port of the priority valve (14) to an oil inlet of the full hydraulic steering gear (10), and an oil outlet of the emergency steering device (2) is connected with a pipeline between the first check valve (12) and the full hydraulic steering gear (10).
3. The forklift steering system according to claim 2, wherein a second check valve (25) is provided at an oil outlet of the emergency oil pump (23) to enable hydraulic oil to flow from the oil outlet of the emergency oil pump (23) to an oil inlet of the full hydraulic steering gear (10).
4. A fork lift truck steering system according to claim 3, characterized in that a safety valve (24) is provided between the emergency oil pump (23) and the second non-return valve (25).
5. The forklift steering system according to claim 4, characterized in that the emergency oil pump (23) is embodied as a fixed displacement pump.
6. A fork lift truck steering system according to claim 2, characterized in that a pressure switch (13) is arranged between the priority valve (14) and the first non return valve (12).
7. The forklift steering system according to any one of claims 2 to 6, further comprising a charging oil pump (5), a charging valve (7) and an accumulator (8) connected in series.
8. A fork lift truck steering system according to claim 7, characterized in that the accumulator (8) is connected to the line between the first non return valve (12) and the full hydraulic steering gear (10) by a shut-off valve (9).
9. The forklift steering system according to claim 8, wherein the main working oil pump (3) is connected to the tank (1) via a main oil filter (4), the emergency oil pump (23) is connected to the tank (1) via an emergency oil filter (22), and the charge oil pump (5) is connected to the tank (1) via a charge oil filter (6).
10. A fork lift truck characterized by comprising a fork lift truck steering system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010725636.8A CN111732033A (en) | 2020-07-24 | 2020-07-24 | Diesel fork truck steering system and diesel fork truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010725636.8A CN111732033A (en) | 2020-07-24 | 2020-07-24 | Diesel fork truck steering system and diesel fork truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111732033A true CN111732033A (en) | 2020-10-02 |
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ID=72657704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010725636.8A Pending CN111732033A (en) | 2020-07-24 | 2020-07-24 | Diesel fork truck steering system and diesel fork truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111732033A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023179312A1 (en) * | 2022-03-23 | 2023-09-28 | 三一重型装备有限公司 | Steering system and engineering machine |
| RU2817072C1 (en) * | 2022-03-23 | 2024-04-09 | Сани Хэви Эквипмент Ко., Лтд. | Steering system and construction equipment |
-
2020
- 2020-07-24 CN CN202010725636.8A patent/CN111732033A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023179312A1 (en) * | 2022-03-23 | 2023-09-28 | 三一重型装备有限公司 | Steering system and engineering machine |
| RU2817072C1 (en) * | 2022-03-23 | 2024-04-09 | Сани Хэви Эквипмент Ко., Лтд. | Steering system and construction equipment |
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