Operator position sensing device of reach forklift

Abstract

The utility model relates to the technical field of forklifts, and discloses a forward movement type operator position sensing device which comprises a main control module, a motor control module and a sensing module. The first end of the main control module is used for being connected with one end of a power supply; the first end of the motor control module is connected with the second end of the main control module, and the second end of the motor control module is used for being connected with the other end of the power supply; the sensing module is arranged on the side wall of an operation station of the forklift and used for monitoring whether a driver is on the operation station or not, one end of the sensing module is connected with the third end of the main control module, and the other end of the sensing module is connected with the third end of the motor control module. According to the utility model, the force required to be applied by a driver to control the pedal is saved, and the fatigue of the driver in the process of operating the forklift is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, and particularly relates to a position sensing device for an operator of a reach forklift. Background Art

[0002] In the prior art, the front-station reach forklift generally uses a foot pedal microswitch to sense the operation position state of the operator. By the operator stepping on the pedal with force to change the position of the pedal, it is determined whether to release the parking device. This foot-operated microswitch requires the operator to apply a relatively large structural manipulation force. If the driver continuously operates for a long time, it is very easy to cause fatigue. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a position sensing device for an operator of a reach forklift, which solves the problem that the forklift driver is prone to fatigue due to continuously applying a relatively large force to control the pedal.

[0004] To achieve the above purpose, the utility model provides a position sensing device for an operator of a reach forklift, and the sensing device includes:

[0005] A main control module, the first end of the main control module is used to connect with one end of the power supply;

[0006] A motor control module, the first end of the motor control module is connected to the second end of the main control module, and the second end of the motor control module is used to connect with the other end of the power supply;

[0007] A sensing module, the sensing module is arranged on the side wall of the operation station of the forklift, and is used to monitor whether there is a driver at the operation station. One end of the sensing module is connected to the third end of the main control module, and the other end of the sensing module is connected to the third end of the motor control module.

[0008] Preferably, the sensing device further includes a voltage conversion module, one end of the voltage conversion module is connected to the third end of the main control module, and the other end of the voltage conversion module is connected to one end of the sensing module.

[0009] Preferably, the main control module includes:

[0010] A first fuse, one end of the first fuse is used to connect with one end of the power supply;

[0011] A key switch, one end of the key switch is connected to the other end of the first fuse, and the other end of the key switch is connected to the first end of the motor control module;

[0012] A second fuse, one end of the second fuse is used to connect with one end of the power supply;

[0013] The main contactor, one end of the main contactor is connected to the other end of the second fuse, and the other end of the main contactor is connected to the first end of the motor control module.

[0014] Preferably, the motor control module includes:

[0015] The steering motor controller, the first end of the steering motor controller is connected to the other end of the main contactor, the second end of the steering motor controller is connected to the other end of the key switch, and the third end of the steering motor controller is used to be connected to the other end of the power supply;

[0016] The traction motor controller, the first end of the traction motor controller is connected to the other end of the main contactor, the second end of the traction motor controller is connected to the other end of the key switch, and the third end of the traction motor controller is used to be connected to the other end of the power supply.

[0017] Preferably, the coil of the main contactor is connected between the fourth end and the third end of the traction motor controller.

[0018] Preferably, the sensing module includes:

[0019] The second infrared switch, the first end of the second infrared switch is connected to the fourth end of the steering motor controller;

[0020] The first infrared switch, the first end of the first infrared switch is connected to the second end of the second infrared switch, and the second end of the second infrared switch is connected to the fourth end of the traction motor controller.

[0021] Preferably, the voltage conversion module includes a power converter, the first end of the power converter is connected to the other end of the key switch, the second end of the power converter is connected to the third ends of the first infrared switch and the second infrared switch, and the third end of the power converter is connected to the other end of the power supply.

[0022] Preferably, the sensing module further includes a third fuse, one end of the third fuse is connected to the second end of the voltage power converter, and the other end of the third fuse is connected to the third ends of the first infrared switch and the second infrared switch.

[0023] Preferably, a front plate and a rear plate are provided oppositely on the operation station, the light projector one and the reflector one of the first infrared switch are respectively arranged on the front plate and the rear plate, and the light projector two and the reflector two of the second infrared switch are respectively arranged on the front plate and the rear plate for monitoring whether there is a driver on the operation station.

[0024] Through the above technical solution, the present utility model provides a position sensing device for the operator of a reach forklift. By means of the sensing module, it detects whether the driver is in the operation station. Only when the driver is in the operation station, the circuit of the motor control module can be connected, and the forklift releases the parking brake device for other operations. Compared with the prior art, the present utility model eliminates the force that the driver needs to apply on the control pedal, and greatly reduces the fatigue of the driver during the operation of the forklift. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a circuit diagram of a control circuit according to an embodiment of the present utility model;

[0026] Figure 2 is a simplified circuit diagram of a control circuit according to an embodiment of the present utility model;

[0027] Figure 3 is a schematic diagram of an operation station according to an embodiment of the present utility model.

[0028] DESCRIPTION OF THE REFERENCE NUMERALS

[0029] 1. First infrared switch; 14. First reflector; 15. First light projector; 2. Second infrared switch; 21. First light projector; 22. Second reflector; 3. Front plate; 4. Rear plate; 5. Power supply; 6. Traction motor controller; 7. Steering motor controller; 8. Power converter; 9. First fuse; 10. Second fuse; 11. Third fuse; 12. Key switch; 13. Main contactor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following further describes the specific embodiments of the present utility model in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not intended to limit the present utility model.

[0031] Figure 1 is a circuit diagram of a control circuit according to an embodiment of the present utility model, Figure 2It is a simplified circuit diagram of a control loop according to an embodiment of the present utility model. In this figure, the sensing device includes a main control module, a motor control module, and a sensing module. Among them, the first end of the main control module is used to connect to one end of the power supply 5; the first end of the motor control module is connected to the second end of the main control module, and the second end of the motor control module is used to connect to the other end of the power supply 5; the sensing module is arranged on the side wall of the operation station of the forklift for monitoring whether there is a driver at the operation station. One end of the sensing module is connected to the third end of the main control module, and the other end of the sensing module is connected to the third end of the motor control module. The main control module is externally connected to a key switch plug-in. The forklift driver uses the key to start the forklift. After the motor control module is powered on, it performs self-checking, and the sensing module is powered on for continuous monitoring. Only when it is detected that the driver is in the correct position at the operation station, the control switch of the motor control module is opened, and the forklift enters the standby state.

[0032] In order to divide the circuit to obtain a voltage suitable for the operation of the sensing module to supply power to the sensing module and enable the monitoring function of the sensing module to operate continuously, in an embodiment of the present utility model, the sensing device further includes a voltage conversion module. One end of the voltage conversion module is connected to the third end of the main control module, and the other end of the voltage conversion module is connected to one end of the sensing module, thereby protecting the operation of the sensing module circuit.

[0033] In an embodiment of the present utility model, for the specific composition of the main control module circuit, there are various types known to those skilled in the art. Considering that the branch voltages of the sensing module and the motor control module are different, in a preferred example of the present utility model, the circuit of the main control module may include a first fuse 9, a key switch 12, a second fuse 10, and a main contactor 13. One end of the first fuse 9 is used to connect to one end of the power supply 5, one end of the key switch 12 is connected to the other end of the first fuse 9. The first fuse 9 is used to prevent damage caused by overcurrent in the circuit. The other end of the key switch 12 is connected to the first end of the motor control module. After the key switch 12 is turned on, the motor control module and the sensing module receive current supply. The motor control module performs self-checking, and the sensing module turns on the monitoring function. One end of the second fuse 10 is used to connect to one end of the power supply 5, one end of the main contactor 13 is connected to the other end of the second fuse 10. The second fuse 10 is used to prevent damage caused by overcurrent in the circuit. The other end of the main contactor 13 is connected to the first end of the motor control module. The main contactor 13 participates in controlling the stop and release of the motor in the motor control module.

[0034] In an embodiment of the present utility model, the specific composition of the motor control module circuit can be various known to those skilled in the art. In a conventional example of the present utility model, the circuit of the motor control module may include a steering motor controller 7 and a traction motor controller 6. Optionally, the steering motor controller 7 may adopt a control chip with a model of EPSACO 48V / 50A. The first end of the steering motor controller 7 is connected to the other end of the main contactor 13. The first end of the steering motor controller 7 is the positive terminal of the steering motor controller 7. The second end of the steering motor controller 7 is connected to the other end of the key switch 12. The second end of the steering motor controller 7 is the control signal port. The signal transmitted through the key switch 12 controls the start and stop and other states of the steering motor. The third end of the steering motor controller 7 is used to connect to the other end of the power supply 5. The third end of the steering motor controller 7 is the negative terminal. The positive terminal and the negative terminal of the steering motor cooperate to control the stop and release of the steering motor;

[0035] The traction motor controller 6 may optionally adopt a control chip with a model of ACE2 48V / 350A. The first end of the traction motor controller 6 is connected to the other end of the main contactor 13. The first end of the traction motor controller 6 is the positive terminal. The second end of the traction motor controller 6 is connected to the other end of the key switch 12. The second end of the traction motor controller 6 is the signal control port. The signal transmitted through the key switch 12 controls the start and stop and other states of the traction motor. The third end of the traction motor controller 6 is used to connect to the other end of the power supply 5. The third end of the traction motor controller 6 is the negative terminal. The positive terminal and the negative terminal of the traction motor cooperate to control the stop and release of the traction motor; When the key switch 12 is started, after the signal control port of the traction motor controller 6 and the signal control port of the steering motor controller 7 receive the start signal from the key switch 12, the output voltage of the steering motor controller 7 is pulled low to connect the induction module.

[0036] In the present utility model, the self-checking method that can be implemented is that the coil of the main contactor 13 is connected between the fourth end and the third end of the traction motor controller 6. When the signal control port of the traction motor controller 6 operates normally, the coil of the main contactor 13 detects a voltage difference generated between the third end and the fourth end of the traction motor controller 6, and then the main contactor 13 is turned on.

[0037] In an embodiment of the present utility model, the specific composition of the induction module circuit can be various known to those skilled in the art. Considering that the space of the operation station is not large, there may be a situation where the driver unconsciously triggers the connection of an infrared switch. To ensure that the infrared switch is connected by the driver's independent operation, in a preferred example of the present utility model, the circuit of the induction module may include a first infrared switch 1 and a second infrared switch 2. The first end of the second infrared switch 2 is connected to the fourth end of the steering motor controller 7, and the fourth end of the steering motor controller 7 is a low-voltage output end. The first end of the first infrared switch 1 is connected to the second end of the second infrared switch 2, and the second end of the second infrared switch 2 is connected to the fourth end of the traction motor controller 6. The fourth end of the traction motor controller 6 is a control switch. The current in this circuit flows through the steering motor controller 7, the second infrared switch 2, the first infrared switch 1, and the traction motor controller 6 in sequence. Only when both legs of the driver are in the correct positions, that is, both the second infrared switch 2 and the first infrared switch 1 are connected, can the circuit be conductive, the control switch of the traction motor controller 6 is turned on, and the forklift enters the standby state.

[0038] In an embodiment of the present utility model, the specific composition of the voltage conversion module circuit can be various known to those skilled in the art. In a conventional example of the present utility model, the circuit of the voltage conversion module may include a power converter 8. The first end of the power converter 8 is connected to the other end of the key switch 12. The second end of the power converter 8 is connected to the third ends of the first infrared switch 1 and the second infrared switch 2. The third end of the power converter 8 is connected to the other end of the power supply 5. After the system self-check, the second end of the power converter 8 converts and outputs a +24V power supply to supply power to the first infrared switch 1 and the second infrared switch 2.

[0039] In the present utility model, the induction module further includes a third fuse 11. One end of the third fuse 11 is connected to the second end of the power converter 8, and the other end of the third fuse 11 is connected to the third ends of the first infrared switch 1 and the second infrared switch 2, which is used to prevent damage caused by overloading of the current in the circuit. When the current in the induction module circuit exceeds the rated value, the third fuse 11 melts and cuts off the circuit to prevent the current from flowing continuously, thereby protecting the circuit and equipment.

[0040] Figure 3It is a schematic diagram of an operation station according to an embodiment of the present utility model. Opposite front plate 3 and rear plate 4 are provided on the operation station. The light projector 15 of the first infrared switch 1 and the first reflector 14 are respectively provided on the front plate 3 and the rear plate 4. The light projector 21 of the second infrared switch 2 and the second reflector 22 are respectively provided on the front plate 3 and the rear plate 4, and are used to monitor whether there is a driver on the operation station. When the driver is at the operation station and the legs are respectively between the light projector 15 and the first reflector 14, and between the light projector 21 and the second reflector 22, the light projector 15 cannot receive the light from the first reflector 14, and the light projector 21 cannot receive the light from the second reflector 22. Only then can both the first infrared switch 1 and the second infrared switch 2 be closed, and the circuit can be in circulation. The control switch of the traction motor controller 6 is closed, and the vehicle enters the standby state. If either the light projector 15 or the light projector 21 can receive light, the vehicle cannot run.

[0041] Through the above technical solution, the present utility model provides a position sensing device for an operator of a reach forklift. By means of a sensing module, it detects whether the driver is in the operation station. Only when the driver is in the operation station, the circuit of the motor control module can be connected, and the forklift releases the parking brake device to perform other operations. Compared with the prior art, the present utility model eliminates the force that the driver needs to apply on the control pedal, greatly reducing the fatigue of the driver during the operation of the forklift. An example of a specific circuit flow mode is that the driver's legs are respectively between the light projector 15 and the reflector 14, and between the light projector 21 and the reflector 22. The key switch 12 connected to the positive terminal of the power supply 5 is closed, and then the signal control port KS2 of the steering motor controller 7, the signal control port KS1 of the traction motor controller 6, and the input port B+ of the power converter 8 connected to the key switch 12 are respectively connected. Thus, the control chips U2 of the steering motor controller 7 and U1 of the traction motor controller 6 are powered on, and at the same time, the power converter 8 is powered on to convert out a +24V power supply. The negative terminal connection terminals BN2 of the steering motor controller 7, the negative terminal connection terminal BN1 of the traction motor controller 6, and the negative power supply terminals GND1, GND2 of the power converter 8 are connected to the negative terminal of the power supply 5. At this time, the coil of the main contactor 13 on the traction motor controller 6 senses a pressure difference, and the main contactor 13 connected to the positive terminal of the power supply 5 is closed. Then, the positive terminal connection terminals BP2 of the steering motor controller 7 and BP1 of the traction motor controller 6 connected to the main contactor 13 are respectively powered on. The voltage of the self-check output terminal OUT of the steering motor controller 7 is pulled low, the second infrared switch 2 connected to the self-check output terminal OUT of the steering motor controller 7 is turned on, and then the first infrared switch 1 connected to the second infrared switch 2 is turned on. Then, the control switch OPS of the traction motor controller 6 connected to the first infrared switch 1 is turned on. The first fuse 9 connected between the key switch 12 and the positive terminal of the power supply 5, the second fuse 10 connected between the main contactor 13 and the positive terminal of the power supply 5, and the third fuse 11 connected between the power converter 8 and the first infrared switch 1 and the second infrared switch 2 are turned on to protect the circuit, and the vehicle enters the standby state.

[0042] The optional embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present utility model are not limited to the specific details in the above embodiments. Within the technical concept scope of the embodiments of the present utility model, various simple modifications can be made to the technical solutions of the embodiments of the present utility model, and these simple modifications all fall within the protection scope of the embodiments of the present utility model.

[0043] In addition, any combination can be made among the various different embodiments of the embodiments of the present utility model, as long as it does not violate the idea of the embodiments of the present utility model, and it should also be regarded as the content disclosed by the embodiments of the present utility model.

[0044] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the embodiments of the present utility model will not separately describe various possible combination manners.

Claims

1. A forward moving forklift operator position sensing device, characterized in that, Comprising: A main control module, the first end of which is used to connect to one end of a power supply; A motor control module, the first end of which is connected to the second end of the main control module, and the second end of which is used to connect to the other end of the power supply; An induction module, which is arranged on the side wall of the operation station of a forklift and is used to monitor whether there is a driver at the operation station. One end of the induction module is connected to the third end of the main control module, and the other end of the induction module is connected to the third end of the motor control module.

2. The induction device according to claim 1, wherein The induction device further includes a voltage conversion module, one end of which is connected to the third end of the main control module, and the other end of which is connected to one end of the induction module.

3. The induction device according to claim 2, characterized in that The main control module includes: A first fuse, one end of which is used to connect to one end of the power supply; A key switch, one end of which is connected to the other end of the first fuse, and the other end of which is connected to the first end of the motor control module; A second fuse, one end of which is used to connect to one end of the power supply; A main contactor, one end of which is connected to the other end of the second fuse, and the other end of which is connected to the first end of the motor control module.

4. The induction device according to claim 3, characterized in that, The motor control module includes: A steering motor controller, the first end of which is connected to the other end of the main contactor, the second end of which is connected to the other end of the key switch, and the third end of which is used to connect to the other end of the power supply; A traction motor controller, the first end of which is connected to the other end of the main contactor, the second end of which is connected to the other end of the key switch, and the third end of which is used to connect to the other end of the power supply.

5. The induction device according to claim 4, characterized in that The coil of the main contactor is connected between the fourth end and the third end of the traction motor controller.

6. The induction device according to claim 5, wherein The induction module includes: A second infrared switch, the first end of which is connected to the fourth end of the steering motor controller; A first infrared switch, the first end of which is connected to the second end of the second infrared switch, and the second end of the second infrared switch is connected to the fourth end of the traction motor controller.

7. The induction device according to claim 6, wherein The voltage conversion module includes a power converter, the first end of which is connected to the other end of the key switch, the second end of which is connected to the third ends of the first infrared switch and the second infrared switch, and the third end of which is connected to the other end of the power supply.

8. The induction device according to claim 7, characterized in that, The induction module further includes a third fuse, one end of which is connected to the second end of the power converter, and the other end of which is connected to the third ends of the first infrared switch and the second infrared switch.

9. The induction device according to claim 8, characterized in that, A front plate and a rear plate are provided oppositely on the operation station. The light projector one and the reflector one of the first infrared switch are respectively arranged on the front plate and the rear plate correspondingly. The light projector two and the reflector two of the second infrared switch are respectively arranged on the front plate and the rear plate correspondingly, and are used to monitor whether there is a driver on the operation station.

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