Forklift safe driving control system

Abstract

The utility model discloses a forklift safe driving control system which comprises a control circuit formed by connecting a power supply, a key switch and a controller in series, and further comprises a reversing handle switch installed on a reversing handle and used for detecting the gear of the reversing handle, and a seat switch installed on a seat and used for detecting whether a driver is on the seat or not. The output end of the key switch, the output end of the reversing handle switch and the output end of the seat switch are all connected with the controller, the output end of the controller is connected with the hand brake switch through the walking electromagnetic valve, and the hand brake switch is connected with the negative electrode end of the power source. And an electronic brake valve is connected in series between the positive electrode end of the power supply and the hand brake switch. The double-loop design that the hand brake switch controls the working loops of the walking electromagnetic valve and the electronic brake valve at the same time is adopted, braking releasing and vehicle walking are synchronously executed, the safety of forklift driving is effectively improved, and the problems of braking abrasion or driving risks caused by misoperation are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of safe driving of forklifts, in particular to a safe driving control system for forklifts. Background Art

[0002] Forklifts are widely used, and the safety, function and comfort of forklifts are increasingly required. With the development of intelligence, the comfort of forklift function operation has been greatly improved, and the operation process has been simplified, which puts higher requirements on the operator's pre-driving vehicle inspection and operation specifications. If the operator does not sit in the seat and misoperates the reversing handle, it will cause a safety accident; therefore, it is necessary to actually detect whether the driver is in the seat and the gear position of the reversing handle. In addition, the current braking system of the forklift uses an electronic brake valve to control the brake and braking of the brake. The circuit of the electronic brake valve is connected in series to the power supply to control its power supply separately. When the driver forgets to cut off the power of the electronic brake valve so that its working circuit is still on, the driver operates the forklift to drive, which will not only cause a safety accident, but also damage the forklift. Utility Model Content

[0003] The purpose of the utility model is to provide a forklift safe driving control system to solve the problems raised in the above background technology.

[0004] The specific technical solutions are as follows:

[0005] A forklift safe driving control system comprises a control circuit formed by a power supply, a key switch and a controller connected in series, and also comprises a reversing handle switch installed on the reversing handle for detecting its gear position, and a seat switch installed on the seat for detecting whether the driver is in the seat; the output ends of the key switch, the reversing handle switch and the seat switch are all connected to the controller, the output end of the controller is connected to a hand brake switch through a travel solenoid valve, and the hand brake switch is connected to the negative terminal of the power supply; an electronic brake valve is connected in series between the positive terminal of the power supply and the hand brake switch.

[0006] In a further embodiment, the gear position of the reversing handle is forward, reverse or neutral.

[0007] In a further solution, the hand brake switch has two working states: a braking state or a walking state.

[0008] In a further solution, the hand brake switch includes two switch groups, wherein switch group one is composed of switches K1, K2 and K3, and switch group two is composed of switches K4, K5 and K6; when switches K1 and K2 are turned on, switches K4 and K5 are turned on, both are in the braking state; when switches K2 and K3 are turned on, switches K5 and K6 are turned on, both are in the walking state.

[0009] Preferably, the switch K2 is connected to the electronic brake valve, the switch K5 is connected to the travel solenoid valve, and the switches K3 and K6 are both connected to the negative terminal of the power supply.

[0010] The controller is used to receive signals from the seat switch, the reversing handle switch and the key switch. When the key switch is closed, the vehicle is in the starting state, and the controller outputs the corresponding power signal according to the current state of the reversing handle, whether it is forward, reverse or neutral.

[0011] The handbrake switch has two working states, a double-pole double-throw design, and controls the braking state or walking state of the entire vehicle at the same time.

[0012] The travel solenoid valve is connected in series between the controller and the hand brake switch to form a normal working circuit of the travel solenoid valve.

[0013] The electronic brake valve is connected in series between the power supply and the hand brake switch to form a normal working circuit of the electronic solenoid valve.

[0014] When the driver sits on the seat, the seat switch is closed, the reversing handle is in neutral, and the key switch is started. The hand brake switch controls the electronic brake valve to release from the braking state to the release state, and the vehicle brakes are released; at the same time, the travel solenoid valve controlled by the hand brake switch is connected to the negative terminal of the power supply, and the reversing handle is operated to the forward or reverse gear. The controller receives the forward or reverse command and detects that the seat switch and the key switch are both in the closed state. The controller controls the forward or reverse power supply signal output, and the travel solenoid valve working circuit is connected, and the vehicle can drive normally.

[0015] The utility model realizes the safety of forklift driving by setting up dual-circuit control in the forklift driving control system, that is, the working circuit of the travel solenoid valve and the working circuit of the electronic solenoid valve are two independently controlled circuits. It also avoids the difference in operating behavior of operators and the mutual interference of the two working circuits, as well as the whole vehicle failure caused by forced driving when the driving behavior is not standardized, that is, the brake is not released.

[0016] In the utility model, the controller must simultaneously receive the forward or backward signal of the reversing handle, the seat switch, and the key switch before it outputs a signal to the travel solenoid valve. If the hand brake switch is in the travel state at this time, the travel solenoid valve is energized and the oil circuit is connected to drive the entire vehicle to move forward or backward. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a principle block diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the hand brake switch in the utility model;

[0019] Figure 3 This is a circuit diagram of the electronic brake valve and the hand brake switch in the utility model;

[0020] Figure 4 It is a circuit diagram of the travel solenoid valve and the hand brake switch in the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 As shown, a forklift safe driving control system includes a control circuit composed of a power supply 8, a key switch 3 and a controller 4 connected in series, and also includes a reversing handle switch 1 installed on the reversing handle for detecting its gear position, and a seat switch 2 installed on the seat for detecting whether the driver is in the seat; the output ends of the key switch 3, the reversing handle switch 1 and the seat switch 2 are all connected to the controller 4, and the output end of the controller 4 is connected to the hand brake switch 6 through the travel solenoid valve 5, and the hand brake switch 6 is connected to the negative terminal of the power supply 8; an electronic brake valve 7 is connected in series between the positive terminal of the power supply 8 and the hand brake switch 6.

[0023] The power source 8, electronic brake valve 7, controller 4, key switch 3, reversing handle switch 1 and seat switch 2 in the utility model are all conventional products in the field of forklifts and can be directly purchased and used. The controller 4 or the selected model is D03KZQ012, and only its own working performance is used to apply it to the utility model, and no improvement of its structure or principle is involved.

[0024] The shift handle in the utility model has three shift positions, namely forward, reverse or neutral. The shift handle switch 1 is used to detect whether the working state of the shift handle is a non-neutral state (forward or reverse) or a neutral state, and provide the controller with a current driver's shift input signal.

[0025] The seat switch 2 is installed at the bottom of the seat and is a mechanical switch used to determine whether the driver is in the seat. When the driver is in the seat, the seat switch is closed and outputs a signal to the controller.

[0026] When the reversing handle is in a non-neutral state, that is, moving forward or backward, the controller receives the signal of the reversing handle switch 1 as one of the effective signals of the controller;

[0027] When the seat switch 2 is closed, the controller receives the seat switch signal as the second effective signal of the controller;

[0028] When the key switch 1 is closed, the controller receives the signal that the vehicle is in the starting state, which is used as the third valid signal of the controller.

[0029] That is, after the controller receives the above three signals, it outputs a signal to the travel solenoid valve. If the hand brake switch is in the travel state, the travel solenoid valve is energized to work, connect the oil circuit, and drive the vehicle forward or backward. If the hand brake switch is in the braking state, the travel solenoid valve does not work, that is, the oil circuit cannot be connected, and the vehicle is in the braking state.

[0030] like Figure 2 As shown, the hand brake switch has two working states: braking state or walking state. Specifically, the hand brake switch includes two switch groups, wherein switch group one is composed of switches K1, K2 and K3, and switch group two is composed of switches K4, K5 and K6; when switches K1 and K2 are turned on, switches K4 and K5 are turned on, both are in braking state; when switches K2 and K3 are turned on, switches K5 and K6 are turned on, both are in walking state. The switch K2 is connected to the electronic brake valve, the switch K5 is connected to the walking solenoid valve, and switches K3 and K6 are both connected to the negative terminal of the power supply (such as Figure 3 , 4 shown).

[0031] That is, the normal operation of the travel solenoid valve requires not only the control of the controller, but also the formation of an electrical circuit with the hand brake switch. The travel solenoid valve can only be energized to close, and the vehicle can move normally. The key switch 3 and the seat switch 2 are both turned on:

[0032] 1. When the reversing handle is in forward or backward position:

[0033] The switches K5 and K6 in the hand brake switch 6 are connected, the switch K6 is connected to the negative terminal of the power supply 8, and the switch K5 is connected to the driving solenoid valve 5, thus forming a closed circuit of the positive terminal of the power supply 8 - the controller 4 - the driving solenoid valve 5 - the switches K5 and K6 in the hand brake switch 6 - the negative terminal of the power supply 8, that is, the oil circuit of the driving solenoid valve 5 is connected, driving the whole vehicle to move forward or backward.

[0034] The hand brake switch 6 is connected with switches K2 and K3, switch K3 is connected to the negative terminal of the power supply 8, and switch K2 is switched with the electronic brake valve 7. That is, when the vehicle is powered on, the electronic brake valve 7 is powered, which is connected with switches K2 and K3 in the hand brake switch 6, switch K3 is connected to the negative terminal of the power supply 8, the circuit of the electronic brake valve 7 is connected, and the brake circuit of the vehicle is released.

[0035] 2. When the reversing handle is in neutral, no matter what working state the electronic brake valve is in, the controller 4 has no positive signal output, the travel solenoid valve 5 is in the disconnected state, and the vehicle cannot move forward or backward normally.

[0036] 3. When the hand brake switch 6 is in the braking state, that is, switches K1 and K2 are connected, switches K4 and K5 are connected, operate the reversing handle to put it in forward or reverse position, at this time, the electronic brake valve 7 is in the braking state, the travel solenoid valve 5 is also in the disconnected state, and the whole vehicle is in the braking state.

[0037] 4. When the hand brake switch 6 is in the brake release state, that is, switches K2 and K3 are turned on, and switches K5 and K6 are turned on, the electronic brake valve 7 forms an electronic circuit and the brake is released; at the same time, the reversing handle is operated to move forward or backward, then the controller 5 outputs a positive signal, and the circuit of the travel solenoid valve 5 is formed. If the vehicle has sufficient oil, it can travel normally.

[0038] Therefore, the vehicle driving control requires two conditions at the same time: the working circuits of the electronic brake valve and the travel solenoid valve are both connected. In order to avoid differences in operating behaviors of operators and mutual interference between the two working circuits, as well as vehicle failure caused by forced driving when driving behavior is not standardized or the brakes are not released, the utility model adopts a dual-circuit control circuit with the same switch, making the operation simpler, safer and more reliable.

[0039] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0040] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A forklift safe driving control system, comprising a control circuit composed of a power supply, a key switch and a controller connected in series, characterized in that: It also includes a reversing handle switch installed on the reversing handle for detecting its gear position, and a seat switch installed on the seat for detecting whether the driver is on the seat; the output ends of the key switch, the reversing handle switch and the seat switch are all connected to the controller, the output end of the controller is connected to the hand brake switch through a travel solenoid valve, and the hand brake switch is connected to the negative terminal of the power supply; an electronic brake valve is connected in series between the positive terminal of the power supply and the hand brake switch.

2. A forklift safe driving control system according to claim 1, characterized in that: The gear position of the reversing handle is forward, backward or neutral.

3. A forklift safe driving control system according to claim 1, characterized in that: The hand brake switch has two working states: a braking state or a walking state.

4. A forklift safe driving control system according to claim 3, characterized in that: The hand brake switch includes two switch groups, wherein switch group one is composed of switches K1, K2 and K3, and switch group two is composed of switches K4, K5 and K6; when switches K1 and K2 are turned on, switches K4 and K5 are turned on, both are in the braking state; when switches K2 and K3 are turned on, switches K5 and K6 are turned on, both are in the walking state.

5. A forklift safe driving control system according to claim 4, characterized in that: The switch K2 is connected to the electronic brake valve, the switch K5 is connected to the travel solenoid valve, and the switches K3 and K6 are both connected to the negative terminal of the power supply.

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