Forklift heating system with electrical delay protection

Abstract

The utility model discloses a fork truck system of making warm with power -on delay protection, including fan, PTC heater and battery, the positive pole of battery is connected with respectively the port B+ of fork truck controller, the input port IN of DC DC chip, the switch part one end of power -on contactor and the one end of emergency stop switch, the other end of emergency stop switch is connected with respectively DC DC chip's enable control port C and the KEY port of fork truck controller through key switch, the output port OUT of DC DC chip is connected with respectively fan's input and the input of time delay ware, and the output of time delay ware is connected with the coil part of power -on contactor, and the switch part other end of power -on contactor is connected with the input of PTC heater, and the negative pole of battery is connected with respectively the port B of fork truck controller - the negative pole end of PTC heater, the negative pole end of time delay ware, the negative pole end of fan and the port B of DC DC chip. The utility model discloses can realize the whole vehicle electrical element power -on is completed, and then carries out power supply to the warm fan, and then avoids the influence of big load to the whole vehicle function.

Description

Technical Field

[0001] This utility model relates to the technical field of forklift heating systems, and in particular to a forklift heating system with power-on delay protection. Background Technology

[0002] With the development of lithium battery technology and the shift towards green production concepts, electric forklifts are becoming increasingly popular in the market. For forklift comfort, high-power electrical appliances such as heaters are often installed. Since the electrical components of electric forklifts are powered by batteries, the simultaneous engagement of these components when the forklift key is turned on can create a high load, causing the battery voltage to drop, leading to vehicle malfunction and affecting normal operation. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a forklift heating system with power-on delay protection, which supplies power to the heater only after all the vehicle's electrical components have been powered on, thereby avoiding the impact of heavy loads on the vehicle's overall functionality.

[0004] A forklift heating system with power-on delay protection according to this utility model includes a fan, a PTC heater, and a battery. The positive terminal of the battery is connected to port B+ of the forklift controller, input port IN of the DC-DC chip, one end of the switch of the power-on contactor, and one end of the emergency stop switch. The other end of the emergency stop switch is connected to the enable control port C of the DC-DC chip and the KEY port of the forklift controller via a key switch. The output port OUT of the DC-DC chip is connected to the input of the fan and the input of the delay device. The output of the delay device is connected to the coil of the power-on contactor. The other end of the switch of the power-on contactor is connected to the input of the PTC heater. The negative terminal of the battery is connected to port B- of the forklift controller, the negative terminal of the PTC heater, the negative terminal of the delay device, the negative terminal of the fan, and port B- of the DC-DC chip.

[0005] Preferably, a PTC temperature control protector is provided near the output port OUT of the DC-DC chip, and the output port OUT of the DC-DC chip is connected to the input terminal of the fan and the input terminal of the delay unit through the PTC temperature control protector.

[0006] Preferably, the circuit connecting the positive terminal of the battery to port B+ of the forklift controller is provided with a switch part of the controller contactor, and the two ends of the coil part of the controller contactor are respectively connected to the PEB port and the NEB port of the forklift controller.

[0007] Preferably, a pre-charging circuit is connected in parallel to both ends of the switching section of the controller contactor.

[0008] Preferably, a fuse is provided on the lines connecting the positive terminal of the battery to the input port IN of the DC-DC chip and the emergency stop switch.

[0009] The beneficial effects of this invention are as follows: When the emergency stop switch and key switch of the vehicle are off, the battery precharges the forklift controller through the pre-charging circuit, avoiding damage to the controller contactor by a large current. After the emergency stop switch and key switch are closed, the DC-DC chip and the port KEY of the forklift controller are energized simultaneously. The DC-DC chip outputs to the outside while the switch of the controller contactor closes. The forklift controller controls the electrical appliances of the vehicle to be powered on. The DC-DC chip outputs to the outside through a delay timer to control the coil of the power-on contactor to conduct for a delayed period. The delayed conduction of the switch of the power-on contactor allows the PTC heater to be energized for a delayed period, eliminating the impact of high-power electrical appliances being powered on simultaneously and lowering the battery voltage. Attached Figure Description

[0010] In the attached diagram: Figure 1 The circuit diagram of a forklift heating system with power-on delay protection proposed in this utility model; Figure 2 This is a schematic diagram of the structure of the heater proposed in this utility model.

[0011] In the diagram: 1. Fuse; 2. Emergency stop switch; 3. Key switch; 4. DC-DC chip; 5. PTC temperature controller; 6. Fan; 7. Timer; 8. Power-on contactor; 9. PTC heater; 10. Controller contactor; 11. Pre-charge circuit; 12. Forklift controller; 13. Battery. Detailed Implementation

[0012] Reference Figure 1 A forklift heating system with power-on delay protection includes a fan 6, a PTC heater 9, and a battery 13. The positive terminal of the battery 13 is connected to port B+ of the forklift controller 12, input port IN of the DC-DC chip, one end of the switch of the power-on contactor 8, and one end of the emergency stop switch 2. The other end of the emergency stop switch 2 is connected to the enable control port C of the DC-DC chip and the KEY port of the forklift controller 12 via a key switch 3. The output port OUT of the DC-DC chip is connected to the input of the fan 6 and the input of the delay unit 7. The output of the delay unit 7 is connected to the coil of the power-on contactor 8. The other end of the switch of the power-on contactor 8 is connected to the input of the PTC heater 9. The negative terminal of the battery 13 is connected to port B- of the forklift controller 12, the negative terminal of the PTC heater 9, the negative terminal of the delay unit 7, the negative terminal of the fan 6, and port B- of the DC-DC chip.

[0013] Obviously, based on the above: after closing the emergency stop switch and the key switch, the DC-DC chip 4 and the port KEY of the forklift controller 12 are simultaneously energized. The DC-DC chip 4 outputs to the outside while the switch of the controller contactor 10 closes, and the forklift controller 12 controls the power supply of the vehicle's electrical components. The DC-DC chip 4 outputs to the outside through the delay timer 7 to control the coil of the power-on contactor 8 to conduct for a delayed time. The delayed conduction of the switch of the power-on contactor 8 causes the PTC heater 9 to be energized for a delayed time. This achieves the effect of the high-power PTC heater 9 being energized for a delayed time while the forklift controller 12 is normally controlling the power supply of the vehicle's electrical components, thereby reducing the impact of the simultaneous power supply pulling down the battery voltage.

[0014] Specifically, the model of delay unit 7 is JSB-42M hybrid delay relay; the model of PTC heater 9 is 80VDC shovel-type PTC electric heater.

[0015] In this embodiment, refer to Figure 2 A PTC temperature controller 5 is installed near the output port OUT of the DC-DC chip 4. The output port OUT of the DC-DC chip 4 is connected to the input terminal of the fan 6 and the input terminal of the delay unit 7 through the PTC temperature controller 5.

[0016] Obviously, based on the above: if the air outlet of the heater becomes blocked during use, causing the internal temperature of the heater to become too high, the PTC temperature controller 5 will disconnect the power supply to the fan 6 and the delay timer 7, causing the PTC heater 9 to stop heating, thus playing a role in overheat protection.

[0017] Specifically, the model of PTC temperature controller 5 is: KSD9700 normally closed thermal protector.

[0018] In this embodiment, a switch portion of a controller contactor 10 is provided on the line connecting the positive terminal of the battery 13 to port B+ of the forklift controller 12. The two ends of the coil portion of the controller contactor 10 are respectively connected to the PEB port and the NEB port of the forklift controller 12.

[0019] Obviously, based on the above, by setting the controller contactor 10, the forklift controller 12 port B+ will only be energized after the coil of the controller contactor 10 is energized.

[0020] In this embodiment, a pre-charging circuit 11 is connected in parallel to both ends of the switching section of the controller contactor 10.

[0021] Obviously, based on the above, the battery 13 precharges the forklift controller 12 through the pre-charging circuit 11 to avoid damage to the power-on contactor 8 by a large current.

[0022] In this embodiment, a fuse 1 is provided on the lines connecting the positive terminal of the battery 13 to the input port IN of the DC-DC chip and the emergency stop switch 2, respectively.

[0023] Obviously, based on the above, the setting of fuse 1 can protect the circuit and prevent large currents from damaging electronic components.

[0024] To more clearly illustrate the implementation plan and its effects, we will use the attached diagram as an example: Reference Figure 1 , Figure 2 When both the emergency stop switch 2 and the key switch 3 are open, the battery 13 precharges the forklift controller 12 through the pre-charging circuit 11. When both the emergency stop switch 2 and the key switch 3 are closed, the KEY port of the forklift controller 12 is energized, the coil of the controller contactor 10 is energized, the switch of the controller contactor 10 is closed, the B+ port of the forklift controller 12 is energized, and the forklift controller 12 operates normally, controlling the power supply and operation of all electrical components in the vehicle. Simultaneously, the enable control port C and the input port IN of the DC-DC chip 4 are energized, and the DC-DC... The output of C chip 4 is connected to delay 7 and fan 6 respectively. When fan 6 starts, the fan power is small and its impact on the vehicle control module is negligible. This process can be completed within 2 seconds. Delay 7 is connected to the coil of power-on contactor 8. Delay 7 allows the coil of power-on contactor 8 to be energized after a delay of 1.5 seconds. After the coil of power-on contactor 8 is energized, the switch of power-on contactor 8 closes, and PTC heater 9 is energized. The whole process can be completed within 3.5 seconds, realizing that the heater is powered on after the vehicle electrical components are powered on.

Claims

1. A forklift heating system with power-on delay protection, characterized in that: The system includes a fan (6), a PTC heater (9), and a battery (13). The positive terminal of the battery (13) is connected to the port B+ of the forklift controller (12), the input port IN of the DC-DC chip, one end of the switch of the power-on contactor (8), and one end of the emergency stop switch (2). The other end of the emergency stop switch (2) is connected to the enable control port C of the DC-DC chip and the KEY port of the forklift controller (12) via a key switch (3). The output port OUT of the DC-DC chip is connected to the output port OUT of the DC-DC chip. The battery (13) is connected to the input terminal of the fan (6) and the input terminal of the delay device (7) respectively. The output terminal of the delay device (7) is connected to the coil of the power-on contactor (8). The other end of the switch of the power-on contactor (8) is connected to the input terminal of the PTC heater (9). The negative terminal of the battery (13) is connected to the port B- of the forklift controller (12), the negative terminal of the PTC heater (9), the negative terminal of the delay device (7), the negative terminal of the fan (6), and the port B- of the DC-DC chip respectively.

2. The forklift heating system with power-on delay protection according to claim 1, characterized in that: A PTC temperature control protector (5) is provided near the output port OUT of the DC-DC chip (4). The output port OUT of the DC-DC chip (4) is connected to the input terminal of the fan (6) and the input terminal of the delay device (7) through the PTC temperature control protector (5).

3. A forklift heating system with power-on delay protection according to claim 1, characterized in that: The positive terminal of the battery (13) is connected to the port B+ of the forklift controller (12) via a switch part of a controller contactor (10). The two ends of the coil part of the controller contactor (10) are respectively connected to the PEB port and the NEB port of the forklift controller (12).

4. A forklift heating system with power-on delay protection according to claim 1, characterized in that: The controller contactor (10) has a pre-charging circuit (11) connected in parallel at both ends of its switching section.

5. A forklift heating system with power-on delay protection according to claim 1, characterized in that: The positive terminal of the battery (13) is connected to the input port IN of the DC-DC chip and the emergency stop switch (2) respectively, and both are equipped with fuses (1).

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