Forklift OPS control system

Abstract

The utility model relates to a forklift OPS control system which comprises a main valve (11), a hydraulic pilot handle (2) connected with the main valve (11), a pilot oil source (8) connected with the hydraulic pilot handle (2), a seat sensor (3) installed below a seat and a vehicle-mounted controller (7), and is characterized in that a handle neutral position detection sensor (4) for detecting the position of the handle is installed on the hydraulic pilot handle (2); an unloading electromagnetic valve (1) is arranged on the hydraulic pipeline (5) which is connected with the pilot oil source (8) and the hydraulic pilot handle (2); the seat sensor (3) and the handle neutral position detection sensor (4) are both in signal connection with the input end of the vehicle-mounted controller (7); a control coil of the unloading electromagnetic valve (1) is in signal connection with the output end of the vehicle-mounted controller (7). According to the utility model, the operation safety of the OPS safety protection system is improved, the potential safety hazard is eliminated, and the operation reliability is improved.

Description

Technical Field

[0001] This utility model relates to a forklift OPS control system, belonging to the field of forklift technology. Background Technology

[0002] Forklift OPS control is a safety system, namely Operator Presence Sensing, which is a system specifically designed to detect whether the forklift driver is in the correct operating position. Its core function is to ensure that the driver is in the driving position through sensors, thereby preventing accidents and providing safety for forklift operation.

[0003] Currently, forklift OPS systems from various domestic and international manufacturers mainly fall into two categories: One type uses sensors installed under the seat to detect the driver's weight or pressure to determine if the driver is in the driving position. The control system receives the signal from the sensor under the seat and controls the forklift's operation accordingly. When the driver leaves the seat, the onboard controller automatically cuts off all forklift actions. The other type adds a handle detection sensor to the seat detection sensor. When the sensor detects the driver is in the driving position, a capacitive sensor on the operating handle detects the driver's hand gripping the handle. The onboard controller controls the vehicle's power system or operating system based on the input signals from the seat and handle detection sensors. When the driver leaves the seat or their hand leaves the operating handle, the forklift stops. To meet these design requirements, the current OPS control method installs a pressure or weight sensor under the driver's seat. The pressure sensor is connected to the onboard control signal input terminal via a cable, and the onboard controller signal output terminal is connected to a cut-off solenoid valve via a cable. When the driver leaves the seat, the onboard controller detects the signal and outputs a signal to the solenoid valve. The solenoid valve de-energizes, cutting off the pilot oil supply to the hydraulic pilot handle, and the main valve stops operating, thus locking all forklift actions.

[0004] The current OPS control system has two main drawbacks: First, when the pilot oil supply is cut off, the internal pressure in the hydraulic lines and hydraulic handle cannot be released quickly and completely, posing a safety hazard due to misoperation. Second, if the operating handle is not in the neutral position when the driver returns to the seat, the onboard controller will receive a signal and directly open the solenoid valve, allowing the pilot oil supply to reach the handle directly through the hydraulic hose, causing the forklift to move immediately, potentially endangering surrounding personnel or goods. Therefore, to address these shortcomings of the existing forklift OPS control system, it is urgent to further improve its operational safety, eliminate safety hazards, and enhance operational reliability. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a forklift OPS control system that is highly safe and reliable in operation.

[0006] The purpose of this utility model is achieved as follows:

[0007] A forklift OPS control system includes a main valve, a hydraulic pilot handle connected to the main valve, a pilot oil source connected to the hydraulic pilot handle, a seat sensor installed under the seat, and an on-board controller. A handle center position detection sensor for detecting the handle position is installed on the hydraulic pilot handle. An unloading solenoid valve is installed on the hydraulic line connecting the pilot oil source and the hydraulic pilot handle. The seat sensor and the handle center position detection sensor are both connected to the input terminal of the on-board controller. The control coil of the unloading solenoid valve is connected to the output terminal of the on-board controller.

[0008] Furthermore, the main valve includes multiple hydraulic control channels, and the hydraulic pilot handle includes a number of control valve groups corresponding to the number of hydraulic control channels of the main valve.

[0009] Furthermore, the main valve is equipped with four hydraulic control channels; the hydraulic pilot handle is equipped with a four-way control valve group to control the four hydraulic control channels corresponding to the main valve.

[0010] Furthermore, the handle center position detection sensor includes four sensors, which respectively detect the handle switch position of the four-way control valve group of the hydraulic pilot handle.

[0011] Furthermore, both the seat sensor and the handle center position detection sensor are connected to the high-level terminal of the power supply to feed back a high-level signal to the vehicle controller.

[0012] Furthermore, the high-level voltage of the power supply is 12V or 24V.

[0013] Furthermore, the unloading solenoid valve is a two-position three-way spool valve.

[0014] Furthermore, the B port, A port, and T port of the unloading solenoid valve are respectively connected to the hydraulic pilot handle, the pilot oil source, and the oil tank.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention incorporates an unloading solenoid valve between the pilot oil source and the hydraulic pilot handle. When the pilot oil source is cut off, the internal pressure in the hydraulic pipeline and the hydraulic pilot handle is quickly and completely released, eliminating potential safety hazards caused by misoperation. A handle center position detection sensor is installed on the hydraulic pilot handle, and a seat sensor is installed under the seat. The hydraulic pilot handle can only connect to the pilot oil source when the driver is seated and the hydraulic pilot handle is in the center position, preventing the forklift from immediately actuating after unlocking and avoiding situations that may endanger the safety of surrounding personnel or goods, thereby improving the safety and reliability of forklift operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection structure of a forklift OPS control system according to the present invention.

[0018] in:

[0019] 1. Unloading solenoid valve; 2. Hydraulic pilot handle; 3. Seat sensor; 4. Handle center position detection sensor; 5. Hydraulic pipeline; 6. Cable; 7. Vehicle controller; 8. Pilot oil source; 9. Oil tank; 10. Power supply; 11. Main valve. Detailed Implementation

[0020] See Figure 1 This utility model relates to a forklift OPS control system, comprising a main valve 11, a hydraulic pilot handle 2 connected to the main valve 11, a pilot oil source 8 connected to the hydraulic pilot handle 2, a seat sensor 3 installed under the seat, and an on-board controller 7; the main valve 11 includes multiple hydraulic control channels, and the hydraulic pilot handle 2 includes a number of control valve groups corresponding to the number of hydraulic control channels of the main valve 11. In this embodiment, both the main valve 11 and the hydraulic pilot handle 2 are provided with four control channels, that is, the four working ports a and b of the hydraulic pilot handle 2 are connected to the four hydraulic channels of the main valve 11 to control the forklift to perform corresponding actions;

[0021] A handle position detection sensor 4 is installed on the hydraulic pilot handle 2 to detect the handle position. Since the hydraulic pilot handle 2 in this embodiment has four control channels, a corresponding handle position detection sensor 4 needs to be installed on the handle of each channel. The four position sensors are connected in parallel to detect and provide feedback on the operating position of the four handles. Specifically, each handle position detection sensor 4 is connected in parallel between the high-level terminal of the power supply 10 and the vehicle controller 7 via a cable 6, wherein the high-level terminal voltage of the power supply 10 is 12V or 24V; if the handle is in the neutral position, i.e., the non-operating position, it does not output a high level to the vehicle controller 7; if the handle is in the operating position, it outputs a high level to the vehicle controller 7.

[0022] An unloading solenoid valve 1 is installed on the hydraulic line 5 connecting the pilot oil source 8 and the hydraulic pilot handle 2. Specifically, the unloading solenoid valve 1 is a two-position three-way spool valve. The B port of the solenoid valve is connected to the hydraulic pilot handle 2, the A port of the solenoid valve is connected to the pilot oil source 8 installed on the vehicle frame, and the T port of the solenoid valve is connected to the hydraulic oil tank 9 installed in the vehicle body. The control coil of the unloading solenoid valve 1 is connected to the output signal of the vehicle controller 7. The vehicle controller 7 determines the working state of the unloading solenoid valve 1 according to the signals of each sensor.

[0023] The seat sensor 3 and the handle center position detection sensor 4 are connected in parallel between the high-level terminal of the power supply 10 and the vehicle controller 7 via cable 6. If the driver is not in the seat, the seat sensor 3 outputs a high-level signal to the vehicle controller 7.

[0024] The forklift OPS safety protection system is an indispensable safety device for forklift operation. It can effectively protect the safety of the driver and surrounding personnel and reduce the risk of accidents. Its working principle is as follows:

[0025] When the driver leaves the seat, the seat sensor 3 sends a signal to the vehicle controller 7. The controller outputs a signal, de-energizing the unloading solenoid valve 1 and cutting off the pilot oil supply 8. Simultaneously, the pressurized oil in the hydraulic pipeline 5 and the hydraulic pilot handle 2 is released into the oil tank 9 through the solenoid valve T port. The main valve 11 stops moving, locking the forklift. Therefore, when the pilot oil supply 8 is cut off, the internal pressure in the hydraulic pipeline 5 and the hydraulic pilot handle 2 can be quickly and completely released, eliminating potential safety hazards caused by misoperation.

[0026] When the driver returns to the seat, if the hydraulic pilot handle 2 is in the neutral position, the handle neutral position detection sensor 4 sends a signal to the vehicle controller 7. The controller outputs a signal, energizing the unloading solenoid valve 1 and opening the pilot oil source 8, thus unlocking the forklift. If the hydraulic pilot handle 2 is not in the neutral position when the driver returns to the seat, the handle neutral position detection sensor 4 transmits a signal to the vehicle controller 7. The controller outputs a signal, de-energizing the unloading solenoid valve 1 and cutting off the pilot oil source, so the forklift remains locked. Therefore, when the driver returns to the seat, if the operating handle is not in the neutral position, even if the driver is seated, the vehicle controller 7 will not directly open the solenoid valve, and the pilot oil source 8 will not directly reach the handle through the hydraulic hose 5. The forklift will not move immediately, avoiding situations that could endanger the safety of surrounding personnel or goods.

[0027] The forklift OPS control system of this utility model improves the safety of forklift operation and reduces accidents caused by improper or misoperated operation by the driver.

[0028] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. A forklift OPS control system, comprising a main valve (11), a hydraulic pilot handle (2) connected to the main valve (11), a pilot oil source (8) connected to the hydraulic pilot handle (2), a seat sensor (3) installed under the seat, and an on-board controller (7), characterized in that: A handle position detection sensor (4) for detecting the handle position is installed on the hydraulic pilot handle (2); an unloading solenoid valve (1) is installed on the hydraulic pipeline (5) connecting the pilot oil source (8) and the hydraulic pilot handle (2); the seat sensor (3) and the handle position detection sensor (4) are both connected to the input signal of the vehicle controller (7); the control coil of the unloading solenoid valve (1) is connected to the output signal of the vehicle controller (7).

2. The forklift OPS control system according to claim 1, characterized in that: The main valve (11) includes multiple hydraulic control channels, and the hydraulic pilot handle (2) includes a number of control valve groups corresponding to the number of hydraulic control channels of the main valve (11).

3. The forklift OPS control system according to claim 2, characterized in that: The main valve (11) is provided with four hydraulic control channels; the hydraulic pilot handle (2) is provided with four control valve groups to control the four hydraulic control channels corresponding to the main valve (11).

4. The forklift OPS control system according to claim 3, characterized in that: The handle center position detection sensor (4) contains four sensors, which respectively detect the handle switch position of the four-way control valve group of the hydraulic pilot handle (2).

5. The forklift OPS control system according to claim 1, characterized in that: The seat sensor (3) and the handle center position detection sensor (4) are both connected to the high-level terminal of the power supply (10) and feed back a high-level signal to the vehicle controller (7).

6. The forklift OPS control system according to claim 5, characterized in that: The high-level voltage of the power supply (10) is 12V or 24V.

7. The forklift OPS control system according to claim 1, characterized in that: The unloading solenoid valve (1) is a two-position three-way slide valve.

8. The forklift OPS control system according to claim 7, characterized in that: The B port, A port and T port of the unloading solenoid valve (1) are respectively connected to the hydraulic pilot handle (2), the pilot oil source (8) and the oil tank (9).

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