Port tractor cab overturning hydraulic system and port tractor

Abstract

The utility model relates to the technical field of port tractors, in particular to a port tractor cab overturning hydraulic system and a port tractor. The oil pump motor assembly is mounted on a boarding ladder of a cab; the fixed end of the overturning oil cylinder is hinged to the frame on the front side of the oil pump motor assembly, and the telescopic end is hinged to the bottom of the cab; the overturning oil cylinder can drive the cab to overturn relative to the frame; an oil inlet of the reversing valve is connected with an oil outlet of the oil pump motor assembly, a first working oil port of the reversing valve is connected with a rod cavity of the overturning oil cylinder, and a second working oil port of the reversing valve is connected with a rodless cavity of the overturning oil cylinder; the oil return port is connected with an oil tank; the overturning oil cylinder can be controlled to stretch out and draw back by adjusting the position of a valve element of the reversing valve. The oil pump motor assembly is arranged on the boarding ladder of the cab, so that a driver can manually control the oil pump motor assembly by using the open space at the boarding ladder, and the turnover of the cab can be manually controlled more conveniently to improve the turnover reliability.

Description

Technical Field

[0001] This utility model relates to the field of port tractor technology, specifically to a hydraulic system for tilting the cab of a port tractor and a port tractor. Background Technology

[0002] The cab tilting hydraulic system is an essential component of port tractors. Its main function is to tilt the cab of the tractor. However, due to wheelbase requirements and limited overall space, some port tractors require cab tilting in most cases when vehicle malfunctions. Therefore, how to rationally arrange the cab tilting hydraulic system to conveniently improve the reliability of cab tilting operations is a problem that needs to be solved.

[0003] Currently, port tractors with limited space typically use oil pump motors mounted inside the chassis below the cab. These motors are electrically controlled and can only operate in automatic tilting mode. In the event of a vehicle malfunction, the oil pump motor may also malfunction and fail to drive the cab tilting, leading to difficult repairs and low reliability. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic system for tilting the cab of a port tractor and a port tractor. By arranging the oil pump motor assembly on the boarding ladder of the cab, the driver can use the open space at the boarding ladder to manually control the oil pump motor assembly, thereby making it easier to manually control the tilting of the cab and improving the reliability of the tilting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this utility model provides a hydraulic system for tilting the cab of a port tractor, comprising:

[0007] The oil pump motor assembly is mounted on the loading ladder in the cab;

[0008] The tilting cylinder has its fixed end hinged to the frame on the front side of the oil pump motor assembly, and its telescopic end hinged to the bottom of the cab; the tilting cylinder can drive the cab to tilt relative to the frame.

[0009] The reversing valve has an inlet connected to the outlet of the oil pump motor assembly, a first working port connected to the rod chamber of the tilting cylinder, and a second working port connected to the rodless chamber of the tilting cylinder; the return port is connected to the oil tank; the extension and retraction of the tilting cylinder can be controlled by adjusting the valve core position of the reversing valve.

[0010] Optionally, the oil pump motor assembly includes an electric pump and a manual pump connected in parallel, with the confluence of the electric pump and the manual pump serving as the oil outlet of the oil pump motor assembly.

[0011] Optionally, both the electric pump and the manual pump have hydraulic locks connected to their oil outlets.

[0012] Optionally, the electric pump is connected to a motor drive, and the manual pump is connected to a rocker arm drive.

[0013] Optionally, the directional valve has a first working position and a second working position; when the directional valve is in the first working position, the oil inlet of the directional valve is connected to the first working oil port, and the second working oil port is connected to the return oil port; when the directional valve is in the second working position, the oil inlet of the directional valve is connected to the second working oil port, and the first working oil port is connected to the return oil port.

[0014] Optionally, the first control terminal and the second control terminal of the reversing valve are respectively connected to a solenoid valve and a manual control lever, and the reversing valve can be switched between the first working position and the second working position by controlling the solenoid valve or the manual control lever.

[0015] Optionally, it also includes:

[0016] A locking mechanism, connected to the cab and used to lock the cab, is used to unlock when the cab is tilted and to lock by the weight of the cab when the cab is falling.

[0017] Optionally, it also includes:

[0018] An overflow valve has its inlet connected to the outlet of the oil pump motor assembly, and its outlet connected to the oil tank. The overflow valve is configured to open when the oil pressure at the inlet of the oil pump motor assembly exceeds a preset threshold.

[0019] Secondly, this utility model provides a port tractor, which includes the aforementioned port tractor cab tilting hydraulic system.

[0020] Compared with the prior art, the present invention has the following advantages: The present invention realizes automatic and manual control of the cab tilting hydraulic system, and the installation and arrangement of the oil cylinder and motor pump realizes convenient manual control of the cab tilting.

[0021] This utility model arranges the oil pump motor assembly on the loading ladder of the cab, making full use of the open space in this location. This allows the driver or maintenance personnel to easily perform manual operation when the vehicle experiences an electrical control failure, significantly improving the reliability of the cab tilting and the efficiency of emergency maintenance. At the same time, the oil pump motor assembly also works with the valve core position switching of the reversing valve to control the extension and retraction of the piston rod of the tilting cylinder, thereby ensuring that the cab can be driven to tilt or reset. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hydraulic system for tilting the cab in Example 1;

[0023] Figure 2 for Figure 1 A structural diagram from another perspective;

[0024] Figure 3 This is a hydraulic schematic diagram of the cab tilting hydraulic system in Example 1.

[0025] The following are labeled in the diagram: 1. Boarding ladder; 2. Oil pump motor assembly; 21. Electric pump; 22. Manual pump; 3. Tilting cylinder; 4. Locking mechanism; 5. Directional valve; 6. Relief valve; 7. Hydraulic lock. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0028] To make the purpose, technical solution and advantages of this utility model patent clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Combination Figures 1-3This embodiment provides a hydraulic system for tilting the cab of a port tractor, comprising an oil pump motor assembly 2, a tilting cylinder 3, and a reversing valve 5. The oil pump motor assembly 2 is a combination of a hydraulic pump and a motor, providing pressure and flow to the hydraulic system. In this embodiment, the oil pump motor assembly 2 is mounted on the loading ladder 1 of the cab. The loading ladder 1 has an open space, allowing the driver to manually control the oil pump motor. The tilting cylinder 3 is the actuator of the hydraulic system, converting liquid pressure into mechanical energy to propel an object. In this embodiment, the fixed end of the tilting cylinder 3 is hinged to the frame on the front side of the oil pump motor assembly 2, and the telescopic end is hinged to the bottom of the cab. The tilting cylinder 3 can drive the cab to tilt relative to the frame. The cab 3 is connected to a locking mechanism 4, which is used to lock the cab 3. The locking mechanism 4 is used to unlock the cab 3 when it tilts and to lock the cab 3 by its own weight when it falls. The directional valve 5 can control the connection, disconnection, and direction of the oil circuit in the hydraulic system. In this embodiment, the oil inlet of the directional valve 5 is connected to the oil outlet of the oil pump motor assembly 2, the first working oil port is connected to the rod chamber of the tilting cylinder 3, and the second working oil port is connected to the rodless chamber of the tilting cylinder 3; the return oil port is connected to the oil tank; the extension and retraction of the tilting cylinder 3 can be controlled by adjusting the valve core position of the directional valve 5.

[0030] Combination Figure 1 and Figure 2 In this embodiment, the oil pump motor assembly 2 and the tilting cylinder 3 are arranged front and rear, with the tilting cylinder 3 located near the front of the cab for easy tilting. The oil pump motor assembly 2 is positioned rearward on the loading ladder 1 of the port tractor body. The loading ladder 1 has an open space, allowing for convenient manual control. This arrangement achieves both automatic and convenient manual control, improving the reliability of the cab's ability to tilt at any time in case of vehicle malfunction.

[0031] In some specific embodiments, the oil pump motor assembly 2 includes an electric pump 21 and a manual pump 22 connected in parallel. The confluence of the electric pump 21 and the manual pump 22 serves as the oil outlet of the oil pump motor assembly 2. Both the oil outlets of the electric pump 21 and the manual pump 22 are connected to a hydraulic lock 7, which is used to hold the tilting cylinder 3 in a designated position. The electric pump 21 is connected to a motor drive, and the manual pump 22 is connected to a rocker arm drive. In this embodiment, both the electric pump 21 and the manual pump 22 can output hydraulic oil. In most cases where the vehicle does not experience an electronic control failure, the electric pump 21 can be used directly to drive the tilting cylinder 3 to tilt the cab. However, when an electronic control failure occurs, causing the electric pump 21 to malfunction, the open space on the loading ladder 1 allows the manual pump 22 to be used directly to drive the tilting cylinder 3 to tilt, thereby improving the reliability of the cab tilting.

[0032] In some specific embodiments, the directional control valve 5 has a first working position and a second working position. When the directional control valve 5 is in the first working position, its inlet and the first working port are connected, and its second working port is connected to the return port. When the directional control valve 5 is in the second working position, its inlet and the second working port are connected, and its first working port is connected to the return port. The first and second control terminals of the directional control valve 5 are respectively connected to a solenoid valve and a manual control lever. By controlling the solenoid valve or the manual control lever, the directional control valve 5 can switch between the first and second working positions. The directional control valve 5 in this embodiment has both automatic and manual control modes.

[0033] First, the working principle of the automatic mode will be explained. When it is necessary to tilt the cab, the control solenoid valve will put the reversing valve 5 in the second working position and start the electric pump 21. At this time, oil will enter the rodless chamber of the tilting cylinder 3 and return oil to the rod chamber. The piston rod of the tilting cylinder 3 will extend and lift the cab. When resetting, the control solenoid valve will put the reversing valve 5 in the first working position. Oil will enter the rod chamber of the tilting cylinder 3 and return oil to the rodless chamber.

[0034] Next, the working principle of the manual mode will be explained. When it is necessary to tilt the cab, the reversing valve 5 is put into the second working position by manually controlling the lever, and oil is pumped by manually pumping pump 22. At this time, oil enters the rodless chamber of the tilting cylinder 3 and oil returns from the rod chamber. The piston rod of the tilting cylinder 3 extends to support the cab. When resetting, the reversing valve 5 is put into the first working position by controlling the lever, and oil enters the rod chamber of the tilting cylinder 3 and oil returns from the rodless chamber.

[0035] In some specific embodiments, the hydraulic system also includes a relief valve 6, the inlet of which is connected to the outlet of the oil pump motor assembly 2, and the outlet is connected to the oil tank; the relief valve 6 is configured to open when the oil pressure at the inlet of the oil pump motor assembly 2 exceeds a preset threshold, and the structural safety of the hydraulic system can be ensured by the relief valve 6.

[0036] Specifically, in existing technologies, the hydraulic pump motor is typically installed inside the frame below the cab, relying solely on the electronic control system for automatic tilting. If the electronic control system fails, the cab tilting function is completely paralyzed, leading to maintenance difficulties. This embodiment, however, employs a hydraulic pump motor assembly 2 consisting of an electric pump 21 and a manual pump 22 connected in parallel, coupled with dual-mode control of the reversing valve 5 (automatic control by the solenoid valve and manual control lever operation). While retaining the automatic control function, it introduces manual control as an emergency backup. Even in the event of a power outage or malfunction of the electric pump 21, the manual pump 22 can still be operated through the open space at the boarding ladder 1 to drive the tilting cylinder 3 to tilt or reset the cab, thus improving tilting reliability. Example 2

[0037] This embodiment provides a port tractor, which includes the port tractor cab tilting hydraulic system described in Embodiment 1.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hydraulic system for tilting the cab of a port tractor, characterized in that, include: The oil pump motor assembly (2) is installed on the loading ladder (1) in the cab; The tilting cylinder (3) has its fixed end hinged to the frame on the front side of the oil pump motor assembly (2), and its telescopic end hinged to the bottom of the cab; the tilting cylinder (3) can drive the cab to tilt relative to the frame. The reversing valve (5) has an inlet port connected to the outlet port of the oil pump motor assembly (2), a first working port connected to the rod chamber of the tilting cylinder (3), a second working port connected to the rodless chamber of the tilting cylinder (3), and an outlet port connected to the oil tank. The tilting cylinder (3) can be extended or retracted by adjusting the valve core position of the reversing valve (5).

2. The hydraulic system for tilting the cab of a port tractor according to claim 1, characterized in that, The oil pump motor assembly (2) includes an electric pump (21) and a manual pump (22) connected in parallel. The confluence of the electric pump (21) and the manual pump (22) serves as the oil outlet of the oil pump motor assembly (2).

3. The hydraulic system for tilting the cab of a port tractor according to claim 2, characterized in that, The outlets of both the electric pump (21) and the manual pump (22) are connected to hydraulic locks (7).

4. The hydraulic system for tilting the cab of a port tractor according to claim 2, characterized in that, The electric pump (21) is connected to the motor drive, and the manual pump (22) is connected to the rocker arm drive.

5. The hydraulic system for tilting the cab of a port tractor according to claim 1, characterized in that, The reversing valve (5) has a first working position and a second working position; when the reversing valve (5) is in the first working position, the oil inlet of the reversing valve (5) is connected to the first working oil port, and the second working oil port is connected to the return oil port; when the reversing valve (5) is in the second working position, the oil inlet of the reversing valve (5) is connected to the second working oil port, and the first working oil port is connected to the return oil port.

6. The hydraulic system for tilting the cab of a port tractor according to claim 5, characterized in that, The first control terminal and the second control terminal of the reversing valve (5) are respectively connected to a solenoid valve and a manual control lever. By controlling the solenoid valve or the manual control lever, the reversing valve (5) can switch between the first working position and the second working position.

7. The hydraulic system for tilting the cab of a port tractor according to claim 1, characterized in that, Also includes: A locking mechanism (4) is connected to the cab and used to lock the cab. The locking mechanism (4) is used to unlock when the cab is flipped and to lock the cab by its own weight when the cab is falling.

8. The hydraulic system for tilting the cab of a port tractor according to claim 1, characterized in that, Also includes: The overflow valve (6) has an inlet connected to the outlet of the oil pump motor assembly (2) and an outlet connected to the oil tank. The overflow valve (6) is configured to open when the oil pressure at the inlet of the oil pump motor assembly (2) exceeds a preset threshold.

9. A port tractor, characterized in that, Includes the port tractor cab tilting hydraulic system as described in any one of claims 1-8.

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