A loader arm hydraulic system and a loader

Abstract

This utility model discloses a hydraulic system for a loader's fork clamp and a loader. The hydraulic system includes a hydraulic oil tank; a working pump, the inlet of which is connected to the hydraulic oil tank; and a first distribution valve, the inlet of which is connected to the outlet of the working pump. The outlet of the first distribution valve is connected to a fork clamp cylinder and a fork clamp rotation motor. The fork clamp cylinder controls the clamping or opening of the fork clamp, and the fork clamp rotation motor controls the rotation of the fork clamp around its central axis. The loader includes a loader body, a boom, and forks clamp. The rear end of the boom is hinged to the front end of the loader body, and the front end of the boom is hinged to the forks clamp. The movement of the forks is controlled by the aforementioned hydraulic system for the loader's fork clamp. This utility model can control both the clamping and opening of the forks clamp and the rotation of the forks clamp, enabling rapid adjustment of the fork clamp position without spending a lot of time moving the loader, thus significantly improving work efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of loader technology, specifically relating to a loader fork hydraulic system and a loader. Background Technology

[0002] Loaders are earthmoving and construction machinery widely used in highway and railway construction, the building industry, and other sectors. A typical loader generally includes a traveling device and a working device, with the working device including the boom, bulldozer blade, and forklift. Among these, the forklift loader is an important piece of machinery in the construction machinery field, widely used in ports, lumber mills, and timber mills, mainly for forestry operations such as stacking and storing logs, transporting logs, and feeding log processing equipment.

[0003] In existing forklift loaders, the forklift is installed at the front end of the boom. It includes a hydraulic cylinder and two articulated forks. The hydraulic cylinder drives the two forks to move to achieve clamping or tensioning functions. The forklift has a single function and requires a lot of time to move the loader in advance to make the forklift accurately align with the log position before it can work, resulting in low work efficiency. Utility Model Content

[0004] The purpose of this utility model is to disclose a hydraulic system for a loader's clamping fork and a loader, which can control both the clamping and opening functions of the clamping fork and the rotation of the clamping fork, so as to achieve rapid adjustment of the position of the clamping fork without spending a lot of time moving the loader, thus greatly improving work efficiency.

[0005] To achieve the above objectives, the first aspect of this utility model discloses a hydraulic system for a loader's fork, comprising: Hydraulic oil tank; The working pump has its inlet connected to the hydraulic oil tank. The first distribution valve has its inlet connected to the outlet of the working pump. The outlet of the first distribution valve is connected to a fork clamping cylinder and a fork clamping rotary motor. The fork clamping cylinder is used to control the clamping or opening of the fork, and the fork clamping rotary motor is used to control the rotation of the fork around the central axis.

[0006] As an optional implementation, the fork rotary motor is equipped with a solenoid valve, which is used to release the brake of the fork rotary motor when energized. The solenoid valve is supplied with oil by the working pump through the first distribution valve.

[0007] As an optional implementation, the oil outlet of the first distribution valve is connected to a tilting cylinder, which is used to control the forward and backward tilting movement of the fork.

[0008] As an optional implementation, the first distribution valve is connected to the tilting cylinder via a floating balance valve, which is used to make the fork float vertically to the horizontal plane under the action of gravity when energized.

[0009] As an optional implementation, the oil outlet of the first distribution valve is connected to a bulldozer blade cylinder, which is used to control the movement of the bulldozer blade.

[0010] As an optional implementation, the outlet of the working pump is connected to a second distribution valve, and the outlet of the second distribution valve is connected to a long boom cylinder and a short boom cylinder, which are used to control the lifting or lowering of the long boom and the short boom, respectively.

[0011] As an optional implementation, the hydraulic system also includes a steering pump, the inlet of which is connected to a hydraulic oil tank, and the outlet of which is connected to a second distribution valve via a flow amplification valve.

[0012] As an optional implementation, shuttle valves are provided between the first distribution valve and the second distribution valve, and between the flow amplification valve and the second distribution valve.

[0013] The second aspect of this utility model discloses a loader, including: a loader body, a boom and a fork, wherein the rear end of the boom is hinged to the front end of the loader body, the front end of the boom is hinged to the fork, and the movement of the fork is controlled by the aforementioned loader fork hydraulic system.

[0014] As an optional implementation, the front end of the loader body is provided with a bulldozer blade, which is located below the boom.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In this invention, the hydraulic cylinder for the fork clamp and the hydraulic motor for the fork clamp are connected in parallel to the oil outlet of the first distribution valve. This allows the hydraulic cylinder to control the clamping or opening of the fork clamp, and the hydraulic motor to control the rotation of the fork clamp around the central axis. As a result, the position of the fork clamp can be quickly adjusted without spending a lot of time moving the loader, thus improving work efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the hydraulic system for the loader fork of this utility model; Figure 2 This is a structural schematic diagram of the loader of this utility model.

[0018] Explanation of key figure labels: 1. Hydraulic oil tank; 2. Steering pump; 3.1. First shuttle valve; 3.2. Second shuttle valve; 4. Flow amplification valve; 5. First distribution valve; 6. Floating balance valve; 7. Tilting cylinder; 8. Forklift cylinder; 9. Forklift rotary motor; 10. Solenoid valve; 11. Bulldozer blade cylinder; 12. Long boom cylinder; 13. Short boom cylinder; 14. Second distribution valve; 15. Working pump; 16. Forklift; 17. Bulldozer blade; 18. Long boom; 19. Short boom; 20. Loader body. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0023] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0024] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0025] Example 1 Please see Figure 1 As shown in the figure, this application provides a loader fork hydraulic system, including a hydraulic oil tank 1, a steering pump 2, a shuttle valve, a flow amplification valve 4, a first distribution valve 5, a floating balance valve 6, a tilting cylinder 7, a fork-holding cylinder 8, a fork-holding rotary motor 9, a solenoid valve 10, a bulldozer blade cylinder 11, a long boom cylinder 12, a short boom cylinder 13, a second distribution valve 14, and a working pump 15, etc.

[0026] The hydraulic oil tank 1, working pump 15, first distribution valve 5, fork-holding cylinder 8, and fork-holding rotary motor 9 are the basic structures of the loader's fork-holding hydraulic system.

[0027] Hydraulic oil tank 1 supplies hydraulic oil to the working oil circuit. The inlet of working pump 15 is connected to hydraulic oil tank 1, and the outlet of working pump 15 is connected to the inlet of first distribution valve 5. The outlet of first distribution valve 5 is connected to fork clamping cylinder 8 and fork clamping rotary motor 9. The output ends of fork clamping cylinder 8 and fork clamping rotary motor 9 are both connected to fork clamping 16. Fork clamping cylinder 8 is used to control fork clamping 16 to clamp or open, and fork clamping rotary motor 9 is used to control fork clamping 16 to rotate around the central axis.

[0028] In this embodiment, the hydraulic circuits of the fork-holding cylinder 8 and the fork-holding rotary motor 9 are connected in parallel to the outlet of the first distribution valve 5. When the working hydraulic circuit is open, the working pump 15 is driven by the engine, and the hydraulic oil in the hydraulic oil tank 1 is delivered to the first distribution valve 5 via the working pump 15. The first distribution valve 5 can select to deliver hydraulic oil to the fork-holding cylinder 8 according to the positional relationship between the fork 16 and the working point, so as to use the fork-holding cylinder 8 to control the fork 16 to perform clamping or opening actions, or it can select to deliver hydraulic oil to the fork-holding rotary motor 9, so as to use the fork-holding rotary motor 9 to control the fork 16 to perform rotation around the central axis of the fork 16. In this way, the hydraulic system achieves precise movement of the fork 16 at the working point by controlling the rotation, clamping or opening of the fork 16, without spending a lot of time moving the loader, which is beneficial to significantly improving work efficiency and reducing the difficulty of adjusting the position of the fork 16.

[0029] It should be noted that the working point refers to the location where logs need to be clamped or stacked, requiring the 16-fork clamp to precisely clamp the logs or place them precisely at the designated location.

[0030] The forklift 16 is generally installed at the front end of the loader boom. The forklift rotary motor 9 is equipped with a solenoid valve 10. The solenoid valve 10 is used to release the brake on the forklift rotary motor 9 when energized. The solenoid valve 10 is supplied with oil by the working pump 15 through the first distribution valve 5. The solenoid valve 10 is controlled by a circuit. When the solenoid valve 10 is energized, the oil circuit of the solenoid valve 10 is opened to release the brake on the forklift rotary motor 9, so that the forklift rotary motor 9 can drive the forklift 16 to rotate around its central axis. When the solenoid valve 10 is de-energized, even if the working oil circuit supplies hydraulic oil to the forklift rotary motor 9, it cannot drive the rotation of the forklift 16.

[0031] In addition to the aforementioned additional rotation function, the outlet of the first distribution valve 5 is connected to a tilting cylinder 7, which is used to control the forward and backward tilting movement of the fork 16. When the working oil circuit is open to supply hydraulic oil to the tilting cylinder 7, the output end of the tilting cylinder 7 is connected to the fork 16, which can drive the fork 16 to tilt forward or backward, thereby adjusting the relative position of the fork 16 and achieving precise gripping of logs.

[0032] The first distribution valve 5 is connected to the tilting cylinder 7 via a floating balance valve 6. When the loader is only lifting or lowering the boom and the tilting cylinder 7 of the fork 16 is not in motion, the floating balance valve 6 is energized. The large and small chamber oil circuits of the tilting cylinder 7 of the fork 16 are connected to the hydraulic oil tank 1, meaning that when the boom is lifting or lowering, the fork 16 floats vertically to the horizontal ground under the action of gravity. Under other conditions, the floating balance valve 6 is de-energized, meaning it locks the fork 16.

[0033] For loaders, in addition to the aforementioned fork 16, the working device generally also includes a bulldozer blade 17. Therefore, the outlet of the first distribution valve 5 is connected to a bulldozer blade cylinder 11, which controls the movement of the bulldozer blade 17. When the working oil circuit is open, hydraulic oil can be delivered to the bulldozer blade cylinder 11 via the working pump 15 and the first distribution valve 5, realizing the lifting and lowering action of the bulldozer blade 17. The movement of the bulldozer blade 17 and the movement of the fork 16 can be performed separately or simultaneously, depending on the operational requirements. In such cases, the oil distribution of the first distribution valve 5 can be controlled using a control mechanism.

[0034] In this embodiment, the fork 16, in addition to rotating, clamping, and opening, also moves up and down with the boom. Based on this, the outlet of the working pump 15 is connected to a second distribution valve 14, and the outlet of the steering pump 2 is connected to the second distribution valve 14 via a flow amplification valve 4. The outlet of the second distribution valve 14 is connected to a long boom cylinder 12 and a short boom cylinder 13, respectively, to control the raising and lowering of the long boom 18 and the short boom 19.

[0035] Hydraulic oil from hydraulic oil tank 1 enters the inlet of working pump 15. The outlet of working pump 15 can supply hydraulic oil to either the first distribution valve 5 or the second distribution valve 14 according to operational needs. When supplying hydraulic oil to the second distribution valve 14, the second distribution valve 14 can deliver the hydraulic oil to the long boom cylinder 12 or the short boom cylinder 13 to control the lifting and lowering of the long boom 18 or the short boom 19. The lifting and lowering actions of the long boom 18 and the short boom 19 can cause the fork 16 to change position in the height or forward / backward direction, adjusting the position of the fork 16 to more accurately correspond to the working point.

[0036] When the long boom 18 and short boom 19 are lifting, the forklift 16 and bulldozer blade 17 may need to operate simultaneously. When this is required, a first shuttle valve 3.1 is provided between the flow amplification valve 4 and the second distribution valve 14 to compare the load pressures of the flow amplification valve 4 and the second distribution valve 14, and to feed back the larger load pressure to the steering pump 2. A second shuttle valve 3.2 is provided between the first distribution valve 5 and the second distribution valve 14 to compare the load pressures of the first distribution valve 5 and the second distribution valve 14, and to feed back the larger load pressure to the working pump 15. This system is a load-sensitive hydraulic system, which uses the pressure difference before and after the valves to control the pump's displacement.

[0037] The hydraulic system also includes a steering pump 2, whose inlet is connected to the hydraulic oil tank 1, and whose outlet is connected to the second distribution valve 14 via a flow amplification valve 4. The steering pump 2 and the flow amplification valve 4 are used in the steering hydraulic system. Hydraulic oil from the hydraulic oil tank 1 is delivered to the flow amplification valve 4 via the steering pump 2, and then to the steering cylinder to control the loader's steering. The flow amplification valve 4 can also be connected to the inlet of the second distribution valve 14, so that when the hydraulic oil delivered by the working pump 15 is insufficient, the steering pump 2 can provide hydraulic oil via the flow amplification valve 4 to flow into the second distribution valve 14, ensuring the lifting and lowering of the long boom 18 and the short boom 19.

[0038] When the loader needs to perform both steering and boom lifting actions, the hydraulic system can reasonably allocate the amount of hydraulic oil delivered from the flow amplification valve 4 to the second distribution valve 14 to ensure that the loader can perform steering actions smoothly. It can also provide a certain amount of hydraulic oil to merge with the hydraulic oil provided by the working pump 15 to the second distribution valve 14, so that the lifting actions of the long boom 18 and the short boom 19 can be carried out smoothly.

[0039] Example 2 See Figure 2 This application provides a loader, including: a loader body 20, a boom and a fork 16. The rear end of the boom is hinged to the front end of the loader body 20, and the front end of the boom is hinged to the fork 16. The movement of the fork is controlled by the loader fork hydraulic system of Embodiment 1.

[0040] The boom includes a long boom 18 and a short boom 19. The rear end of the short boom 19 is hinged to the front end of the loader body 20, and the front end of the short boom 19 is hinged to the rear end of the long boom 18. The front end of the long boom 18 is hinged to the fork 16. The loader can perform steering and forward / backward movement. The long boom 18 and short boom 19 can perform lifting and lowering movements. The fork 16 can perform rotation, clamping, or opening movements. Therefore, the position of the fork 16 can be quickly adjusted without spending a lot of time moving the loader, thereby improving work efficiency.

[0041] The front end of the loader body 20 is equipped with a bulldozer blade 17, which is located below the boom. The bulldozer blade 17 can be raised and lowered to perform actions such as pushing logs.

[0042] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A hydraulic system for a loader's fork, characterized in that, include: Hydraulic oil tank; A working pump, the oil inlet of which is connected to the hydraulic oil tank; A first distribution valve has its inlet connected to the outlet of the working pump. The outlet of the first distribution valve is connected to a fork clamping cylinder and a fork clamping rotation motor. The fork clamping cylinder is used to control the fork clamping or opening, and the fork clamping rotation motor is used to control the fork clamping to rotate around the central axis.

2. The loader fork hydraulic system according to claim 1, characterized in that: The fork rotary motor is equipped with a solenoid valve, which is used to release the brake of the fork rotary motor when energized. The solenoid valve is supplied with oil by the working pump through the first distribution valve.

3. The loader fork hydraulic system according to claim 1 or 2, characterized in that: The oil outlet of the first distribution valve is connected to a tilting cylinder, which is used to control the forward and backward tilting movement of the fork.

4. The loader fork hydraulic system according to claim 3, characterized in that: The first distribution valve is connected to the tilting cylinder via a floating balance valve, which is used to make the fork float vertically to the horizontal plane under the action of gravity when energized.

5. The loader fork hydraulic system according to claim 1 or 2, characterized in that: The oil outlet of the first distribution valve is connected to a bulldozer blade cylinder, which is used to control the movement of the bulldozer blade.

6. The loader fork hydraulic system according to claim 1 or 2, characterized in that: The oil outlet of the working pump is connected to a second distribution valve, and the oil outlet of the second distribution valve is connected to a long boom cylinder and a short boom cylinder, which are used to control the lifting or lowering of the long boom and the short boom, respectively.

7. The loader fork hydraulic system according to claim 6, characterized in that: The hydraulic system also includes a steering pump, the inlet of which is connected to the hydraulic oil tank, and the outlet of which is connected to the second distribution valve via a flow amplification valve.

8. The loader fork hydraulic system according to claim 7, characterized in that: A shuttle valve is provided between the first distribution valve and the second distribution valve, and between the flow amplification valve and the second distribution valve.

9. A loader, characterized in that, include: The loader body, boom, and fork are provided, wherein the rear end of the boom is hinged to the front end of the loader body, the front end of the boom is hinged to the fork, and the movement of the fork is controlled by the loader fork hydraulic system according to any one of claims 1-8.

10. The loader according to claim 9, characterized in that: The front end of the loader body is equipped with a bulldozer blade, which is located below the boom.

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