Hydraulic system for forward oil cylinder of forklift and tackle of forward forklift

Abstract

The hydraulic system for the forward oil cylinder of the forklift and the tackle of the forward forklift comprise the forward oil cylinder, a balancing device and a multi-way valve bank, the forward oil cylinder is connected with the balancing device through a first pipeline and a second pipeline, the balancing device is connected with the multi-way valve bank through a third pipeline and a fourth pipeline, and the multi-way valve bank is connected with the balancing device through a third pipeline and a fourth pipeline. The multi-way valve set is connected with an oil source through a pipeline, and the balancing device is used for balancing oil pressure between the first pipeline and the second pipeline. By introducing the balancing device, the oil pressure between the first pipeline and the second pipeline of the forward moving oil cylinder of the forklift can be accurately balanced, the stability and the reliability of operation of a hydraulic system are ensured, and equipment faults and operation risks possibly caused by unbalanced oil pressure are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of front moving forklift, especially to a hydraulic system for front moving oil cylinder of forklift and a trolley of front moving forklift. BACKGROUND

[0002] In the scenarios of logistics storage, supermarket distribution and industrial production, the front moving forklift becomes the preferred handling tool in the space-limited environment such as the narrow passageway of warehouse, the shelf area of supermarket and the workshop of factory, due to its convenient loading, high maneuverability and driving stability. The core design feature of the forklift is that the mast structure can be flexibly moved forward along the preset track of the leg, effectively shortening the operation distance for picking up or storing goods from the dense shelf. As to the working mechanism of the front moving forklift, the trolley assembly can be precisely moved forward and backward along the leg track under the direct drive of the front moving oil cylinder. The realization of this action relies on the accurate flow distribution of the reversing valve group. When the operator activates the forward moving instruction through the control console, the reversing valve group responds quickly, opens the oil path channel connected with the front moving oil cylinder, and allows the high-pressure hydraulic oil to be transmitted to the front moving oil cylinder through the high-pressure rubber tube, thereby driving the trolley to move forward or backward as needed.

[0003] However, in the actual operation process, especially in complex working conditions, such as when the forklift is simultaneously walking and moving forward, if an emergency braking situation occurs, the trolley will have a tendency to continue moving forward due to inertia. At this time, the actual speed of the trolley may exceed the driving speed of the front moving oil cylinder, causing the state of the trolley being actively driven by the front moving oil cylinder to change to a passive situation where the trolley drags the front moving oil cylinder to move. This unexpected state will quickly reduce the pressure in the inlet chamber of the front moving oil cylinder, forming a negative pressure environment, and thus causing the risk of air being sucked into the hydraulic system. Once air is mixed into the hydraulic oil, the compressibility of the oil will be significantly increased, directly affecting the stable operation of the hydraulic system, causing the operation precision to decrease, the movement of the trolley in the leg track to become unstable, and even causing the trolley to shake, which seriously affects the operation precision and safety of the forklift. UTILITY MODEL CONTENTS

[0004] In order to solve all or part of the problems of the prior art, the utility model provides a hydraulic system for front moving oil cylinder of forklift and a trolley of front moving forklift, which introduces a balancing device to balance the oil pressure between the pipes connected to the front moving oil cylinder, effectively preventing a series of problems caused by unbalanced oil pressure.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] The hydraulic system for the forward moving oil cylinder of a forklift truck comprises a forward moving oil cylinder, a balancing device and a multi-way valve group, the forward moving oil cylinder is connected with the balancing device through a first pipeline and a second pipeline, the balancing device is connected with the multi-way valve group through a third pipeline and a fourth pipeline, the multi-way valve group is connected with an oil source through a pipeline, and the balancing device is used for balancing the oil pressure between the first pipeline and the second pipeline.

[0007] The first pipeline is connected with a first oil port of the forward moving oil cylinder, and the second pipeline is connected with a second oil port of the forward moving oil cylinder; when the first oil port is supplied with oil, the piston rod of the forward moving oil cylinder moves forward, and when the second oil port is supplied with oil, the piston rod of the forward moving oil cylinder retracts.

[0008] The balancing device is a hydraulic balancing valve.

[0009] When a first one-way valve in the hydraulic balancing valve connected with the first pipeline is opened, the first oil port is supplied with oil, and at the same time, an oil passage in the hydraulic balancing valve connected with the second pipeline is conducted to make the second oil port return oil; when a second one-way valve in the hydraulic balancing valve connected with the second pipeline is opened, the second oil port is supplied with oil, and at the same time, an oil passage in the hydraulic balancing valve connected with the first pipeline is conducted to make the first oil port return oil.

[0010] The utility model further provides a front moving formula forklift truck's slide, include: slide frame and above described hydraulic system, the hydraulic system is installed on the slide frame, the slide frame sets up on the forklift truck base, the fixed end of the forward moving oil cylinder is installed on the base of forklift truck, and its drive end is installed in one side of the slide frame, and the slide frame is pushed on the forklift truck base and slides back and forth through the forward moving oil cylinder.

[0011] Further comprising an oil supply device, the oil supply device is fixedly installed on the forklift truck; the oil supply device comprises an oil tank and a power mechanism connected with the oil tank.

[0012] The multi-way valve group is connected with the power mechanism through a fifth pipeline and a sixth pipeline.

[0013] The fourth pipeline and the fifth pipeline are wrapped with a drag chain; the drag chain is made of plastic material.

[0014] The first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline are all high-pressure rubber pipes.

[0015] The multi-way valve group is further connected with a pipeline for supplying oil to a forklift truck lifting oil cylinder and a tilting oil cylinder.

[0016] The utility model has at least the following beneficial effects:

[0017] 1) By innovatively introducing a balancing device in the hydraulic system of the forward-moving forklift, the accurate balance of the oil pressure of the two oil ports of the forward-moving oil cylinder is realized. In particular, the cooperative working mechanism of the internal one-way valve and oil path of the hydraulic balance valve ensures the stability of the oil pressure of the forward-moving oil cylinder during the extension and retraction of the piston rod, effectively avoiding equipment failure and operation risks caused by unbalanced oil pressure.

[0018] 2) The oil path is carefully designed in the utility model, and through the effective connection of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline, and the accurate control of the hydraulic balance valve, the stable transmission and accurate distribution of the hydraulic oil are realized. This design not only improves the operation efficiency of the hydraulic system, but also significantly enhances the stability and reliability of the system.

[0019] 3) The drag chain wrapped with plastic material on the pipeline, and the high-pressure rubber pipe selected as the pipeline material, effectively enhance the durability and wear resistance of the pipeline. This measure not only protects the pipeline from damage by the external environment, but also reduces the risk of system downtime caused by pipeline leakage and other failures, further improving the stability and reliability of the hydraulic system. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the specific embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings described below are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0021] Figure 1 It is a structure schematic view of the hydraulic system for the forward-moving oil cylinder of the forklift of the utility model embodiment 1.

[0022] Figure 2 It is a schematic view of the principle of the hydraulic system provided by the utility model embodiment 1. Figure 1

[0023] Figure 3 It is a structure schematic view of the trolley of the forward-moving forklift of the utility model embodiment 2.

[0024] The reference signs: 1-forward-moving oil cylinder;2-balancing device;3-multipath valve group;4-first pipeline;5-second pipeline;6-third pipeline;7-fourth pipeline;8-trolley frame;9-oil supply device;901-oil tank;902-power mechanism;10-fifth pipeline;11-sixth pipeline;12-drag chain. DETAILED DESCRIPTION

[0025] ​The technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0026] The implementation of the utility model will be described in detail below in combination with specific embodiments.

[0027] Embodiment 1

[0028] In the embodiments of the utility model, in combination with the reference Figure 1 、 Figure 2 , a hydraulic system specially applied to a forklift front moving oil cylinder is provided, which mainly comprises a front moving oil cylinder 1, a balancing device 2 and a multi-way valve group 3. The front moving oil cylinder 1 establishes a connection relationship with the balancing device 2 through a first pipeline 4 and a second pipeline 5, and the balancing device 2 is connected with the multi-way valve group 3 through a third pipeline 6 and a fourth pipeline 7, and the multi-way valve group 3 is further connected with an oil source through a specific pipeline. In this system architecture, the balancing device 2 undertakes a very important function, that is, it can accurately balance the oil pressure between the first pipeline 4 and the second pipeline 5, so as to ensure the stability and reliability of the whole hydraulic system. Specifically, the first pipeline 4 is connected with the first oil port of the front moving oil cylinder 1, and correspondingly, the second pipeline 5 is connected with the second oil port of the front moving oil cylinder 1. In the working process of the hydraulic system, when the first oil port is filled with oil, under the driving action of the oil pressure, the piston rod of the front moving oil cylinder 1 will move forward, thereby realizing the forward moving operation of the forklift; when the second oil port is filled with oil, the oil pressure will cause the piston rod of the front moving oil cylinder 1 to retract, so that the forklift returns to the corresponding initial position or completes other specific action requirements. Under the effective balancing action of the balancing device 2 on the oil pressure, the running safety and stability of the whole hydraulic system are also fully guaranteed, and the equipment failure and operation risk caused by unbalanced oil pressure are reduced.

[0029] In the embodiment, the balancing device 2 specifically adopts a hydraulic balance valve. When the first one-way valve in the hydraulic balance valve connected with the first pipeline 4 is opened, the hydraulic oil provided by the oil source can flow into the first oil port of the forward-moving oil cylinder 1 through the first pipeline 4, so as to realize the oil inlet operation of the first oil port. At the same time, the oil passage in the hydraulic balance valve connected with the second pipeline 5 is synchronously conducted, so that the hydraulic oil in the second oil port of the forward-moving oil cylinder 1 can flow back along the conducted oil passage, thereby realizing the oil return process of the second oil port. Conversely, when the second one-way valve in the hydraulic balance valve connected with the second pipeline 5 is opened, the hydraulic oil will flow into the second oil port of the forward-moving oil cylinder 1 through the second pipeline 5, so as to achieve the oil inlet state of the second oil port. In this case, the oil passage in the hydraulic balance valve connected with the first pipeline 4 is also correspondingly conducted, so as to make the hydraulic oil in the first oil port flow back, thereby completing the oil return operation of the first oil port. The application of the hydraulic balance valve in the hydraulic system of the forward-moving oil cylinder of the forklift truck ingeniously utilizes the cooperative working mechanism of the internal one-way valve and oil passage, accurately and efficiently controls the oil inlet and oil return processes of the two oil ports of the forward-moving oil cylinder 1, effectively balances the oil pressure between the first pipeline 4 and the second pipeline 5, and ensures the stability and reliability of the forward-moving oil cylinder of the forklift truck during the extension and retraction operation of the piston rod.

[0030] Embodiment 2

[0031] In combination with reference Figure 3 As shown in the figure, the embodiment provides a carriage of a forward-moving forklift truck, which mainly consists of a carriage frame 8 and the hydraulic system for the forward-moving oil cylinder of the forklift truck as described in detail in Embodiment 1. The hydraulic system is installed on the carriage frame 8, and the carriage frame 8 is arranged on the base of the forklift truck. The fixed end of the forward-moving oil cylinder 1 is installed on the base of the forklift truck, and the driving end is installed on one side of the carriage frame 8. During the operation of the forklift truck, the extension and retraction movement of the forward-moving oil cylinder 1 can effectively push the carriage frame 8 to slide smoothly forward and backward on the base of the forklift truck, thereby meeting the demand of the forklift truck for adjusting the position of the goods during different operation scenarios. In addition, the carriage is also equipped with an oil supply device 9, which is fixedly installed on the forklift truck. The oil supply device 9 mainly includes an oil tank 901 and a power mechanism 902 connected with the oil tank 901. The oil tank 901 as a key component for storing hydraulic oil provides sufficient oil source guarantee for the continuous operation of the entire hydraulic system; and the power mechanism 902 is responsible for providing necessary power for the transmission of hydraulic oil, so as to ensure that the hydraulic oil can stably and efficiently circulate in the system. The multi-way valve group 3 is connected with the power mechanism 902 through the fifth pipeline 10 and the sixth pipeline 11, so as to realize the accurate distribution and adjustment of the hydraulic oil.

[0032] In order to enhance the durability of the pipeline and protect it from the outside environment, the fourth pipeline 7 and the fifth pipeline 10 are wrapped with a plastic chain 12, and the plastic chain 12 is made of plastic material. The plastic chain 12 has the advantages of light weight, good flexibility, corrosion resistance and the like. While protecting the pipeline from external environmental interference (such as friction, collision, dust, etc.), it can effectively reduce the negative impact of the weight of the chain 12 itself on the overall performance of the forklift, and can adapt to the frequent motion changes of the forklift in complex operating environments, ensuring the stability and safety of the pipeline during long-term use. In the selection of pipeline materials, the first pipeline 4, the second pipeline 5, the third pipeline 6, the fourth pipeline 7, the fifth pipeline 10 and the sixth pipeline 11 are all selected from high-pressure rubber pipes. The high-pressure rubber pipe has good pressure resistance, flexibility and wear resistance, and can meet the transmission requirements of high-pressure oil in the forklift hydraulic system, effectively reducing the risk of pipeline leakage and other faults, greatly improving the reliability and durability of the entire hydraulic system. In addition, the multi-way valve group 3 is also connected with the pipeline for supplying oil to the forklift lifting cylinder and tilting cylinder. This design enables the multi-way valve group 3 to control the forward movement, lifting and tilting of the forklift, and by reasonably distributing the flow direction and pressure of the hydraulic oil, it can meet the diversified operation requirements of the forklift in different operating tasks, further improving the overall operating efficiency and flexibility of the forklift, enabling it to efficiently and stably complete various tasks in complex and variable cargo handling scenarios.

[0033] In the design scheme of the present application, a hydraulic balance valve is introduced innovatively, which plays a core role in precisely controlling the speed of the forklift forward movement cylinder drive pulley moving forward and backward. During the operation of the hydraulic system, when the hydraulic balance valve detects that the pressure in the forward movement cylinder 1 oil inlet chamber is decreasing, the control mechanism inside it starts immediately, gradually reducing the flow of hydraulic oil in the return pipeline. In this way, the speed of the pulley can be effectively regulated, and it gradually slows down. In this way, the pressure in the forward movement cylinder 1 oil inlet chamber can always be maintained within a stable numerical range, effectively avoiding the occurrence of negative pressure. This stable pressure environment ensures that the pulley can run at a stable and predictable speed during forward and backward movement. Whether in conventional operating scenarios such as cargo handling, loading and unloading, or in some special working conditions with high requirements for speed stability, the accuracy, stability and safety of forklift operation can be ensured.

[0034] It should be noted that, for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in many ways, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A hydraulic system for a forward travel cylinder of a fork lift truck, characterized by, The hydraulic system comprises a front-moving oil cylinder (1), a balancing device (2) and a multi-way valve group (3), the front-moving oil cylinder (1) is connected with the balancing device (2) through a first pipeline (4) and a second pipeline (5), the balancing device (2) is connected with the multi-way valve group (3) through a third pipeline (6) and a fourth pipeline (7), the multi-way valve group (3) is connected with an oil source through a pipeline, and the balancing device (2) is used for balancing the oil pressure between the first pipeline (4) and the second pipeline (5). The first pipeline (4) is connected with a first oil port of the front-moving oil cylinder (1), and the second pipeline (5) is connected with a second oil port of the front-moving oil cylinder (1); when the first oil port is filled with oil, the piston rod of the front-moving oil cylinder (1) moves forward, and when the second oil port is filled with oil, the piston rod of the front-moving oil cylinder (1) retracts.

2. The hydraulic system of claim 1, wherein, The balancing device (2) is a hydraulic balancing valve.

3. The hydraulic system of claim 2, wherein, When a first one-way valve connected with the first pipeline (4) in the hydraulic balancing valve is opened, the first oil port is filled with oil, and at the same time, an oil path connected with the second pipeline (5) in the hydraulic balancing valve is conducted to make the second oil port return oil; when a second one-way valve connected with the second pipeline (5) in the hydraulic balancing valve is opened, the second oil port is filled with oil, and at the same time, an oil path connected with the first pipeline (4) in the hydraulic balancing valve is conducted to make the first oil port return oil.

4. The hydraulic system of claim 3, wherein, The hydraulic system comprises a front-moving oil cylinder (1), a balancing device (2) and a multi-way valve group (3), the front-moving oil cylinder (1) is connected with the balancing device (2) through a first pipeline (4) and a second pipeline (5), the balancing device (2) is connected with the multi-way valve group (3) through a third pipeline (6) and a fourth pipeline (7), the multi-way valve group (3) is connected with an oil source through a pipeline, and the balancing device (2) is used for balancing the oil pressure between the first pipeline (4) and the second pipeline (5).

5. A carriage for a reach truck, characterized in that The first pipeline (4) is connected with a first oil port of the front-moving oil cylinder (1), and the second pipeline (5) is connected with a second oil port of the front-moving oil cylinder (1); when the first oil port is filled with oil, the piston rod of the front-moving oil cylinder (1) moves forward, and when the second oil port is filled with oil, the piston rod of the front-moving oil cylinder (1) retracts. The balancing device (2) is a hydraulic balancing valve.

6. The trolley of claim 5, wherein, When a first one-way valve connected with the first pipeline (4) in the hydraulic balancing valve is opened, the first oil port is filled with oil, and at the same time, an oil path connected with the second pipeline (5) in the hydraulic balancing valve is conducted to make the second oil port return oil; when a second one-way valve connected with the second pipeline (5) in the hydraulic balancing valve is opened, the second oil port is filled with oil, and at the same time, an oil path connected with the first pipeline (4) in the hydraulic balancing valve is conducted to make the first oil port return oil.

7. The trolley of claim 6, wherein, The hydraulic system comprises a front-moving oil cylinder (1), a balancing device (2) and a multi-way valve group (3), the front-moving oil cylinder (1) is connected with the balancing device (2) through a first pipeline (4) and a second pipeline (5), the balancing device (2) is connected with the multi-way valve group (3) through a third pipeline (6) and a fourth pipeline (7), the multi-way valve group (3) is connected with an oil source through a pipeline, and the balancing device (2) is used for balancing the oil pressure between the first pipeline (4) and the second pipeline (5).

8. The trolley of claim 7, wherein, The hydraulic system comprises a front-moving oil cylinder (1), a balancing device (2) and a multi-way valve group (3), the front-moving oil cylinder (1) is connected with the balancing device (2) through a first pipeline (4) and a second pipeline (5), the balancing device (2) is connected with the multi-way valve group (3) through a third pipeline (6) and a fourth pipeline (7), the multi-way valve group (3) is connected with an oil source through a pipeline, and the balancing device (2) is used for balancing the oil pressure between the first pipeline (4) and the second pipeline (5).

9. The trolley of claim 7, wherein, The fourth pipeline (7) and the fifth pipeline (10) are wrapped with a drag chain (12); the drag chain (12) is made of plastic.

10. The trolley of claim 5, wherein, The first pipeline (4), the second pipeline (5), the third pipeline (6), the fourth pipeline (7), the fifth pipeline (10) and the sixth pipeline (11) are high-pressure rubber pipes. The multi-way valve group (3) is further connected with pipelines for supplying oil to a lifting oil cylinder and a tilting oil cylinder of a forklift.

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