Power supply safety control system of diesel fork lift truck

Abstract

The utility model discloses a diesel fork lift truck power supply safety control system, which particularly relates to the technical field of forklifts, and comprises a power supply safety control device, a seat sensor, a key switch, a storage battery power supply, an instrument and vehicle control unit power supply, a power supply and a generator power supply, the power supply safety control device comprises a power supply control unit, a control device master controller, a first relay, a second relay and a third relay, the signal output end of the control device master controller is connected with the signal input end of the power supply control unit. Whether a driver is in a normal driving position or not is detected through the seat sensor, so that whether the vehicle is allowed to be started by opening a key or not is controlled, and potential safety accidents possibly caused by the fact that the driver can still open the key to start the vehicle when the driver is in an abnormal driving position are avoided to a certain extent; a gear switch signal of a forklift, a forward and backward tilting switch signal of a door frame and a lifting and descending switch signal of a pallet fork are detected.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, and more specifically to a power safety control system for an internal combustion forklift. Background Art

[0002] It is known that the safety of forklift operations has always attracted much attention, and the safety of forklift power systems has been the focus of attention. Among them, internal combustion forklifts are forklifts powered by engines, which use diesel, gasoline or liquefied petroleum gas as driving fuel. Accidents often occur because the driver is in an abnormal driving state or the power unit is in an unsafe state while the vehicle continues to work.

[0003] However, in the prior art of forklifts, due to the lack of protection technology for the power safety system of internal combustion forklifts, no measures have been taken to protect the power system of the entire vehicle, which poses a very serious safety hazard; therefore, an internal combustion forklift power safety control system is proposed as a further improvement. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a power safety control system for an internal combustion forklift to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a power safety control system for an internal combustion forklift, the system comprising: a power safety control device, a seat sensor, a key switch, a battery power supply, an instrument and a vehicle controller power supply, a power supply and a generator power supply;

[0006] The power safety control device comprises: a power control unit, a control device main control, a first relay, a second relay and a third relay,

[0007] The signal output end of the control device main control is connected to the signal input end of the power control unit, the signal output end of the seat sensor is respectively connected to the signal input end of the power control unit and the signal input end of the control device main control, the signal output end of the control device main control is respectively connected to the signal input ends of the first relay, the second relay and the third relay, the signal output end of the battery power supply is connected to the signal input end of the control device main control through the first relay and the key switch, the signal output end of the power power supply and the signal output end of the instrument and vehicle controller power supply are all connected to the signal input end of the control device main control, the generator power supply is connected to the power power supply through the second relay, and the generator power supply is connected to the instrument and vehicle controller power supply through the third relay.

[0008] Furthermore, the system also includes: a gear switch, a forward and backward tilt switch, and a lifting and lowering switch;

[0009] The signal output end of the shift switch, the signal output end of the forward and backward tilt switch and the signal output end of the lifting and lowering switch are all connected to the signal input end of the main control of the control device.

[0010] Further, the first relay comprises: a coil 1 and a relay switch 1;

[0011] The signal output end of the main control of the control device is connected to the coil package 1, and the two ends of the relay switch 1 are respectively connected to one end of the key switch and the signal output end of the battery power supply.

[0012] Further, the second relay comprises: a second coil and a second relay switch;

[0013] The signal output end of the main control of the control device is connected to the second coil, and the two ends of the second relay switch are respectively connected to the power supply and the generator power supply.

[0014] Further, the third relay comprises: a coil three and a relay switch three;

[0015] The signal output end of the main control of the control device is connected to the wire package 3, and the two ends of the relay switch 3 are respectively connected to the instrument and the vehicle controller power supply and the generator power supply;

[0016] The negative pole of the generator power supply is respectively connected to the first coil, the second coil, the third coil, the negative pole of the battery power supply, the negative pole of the instrument and vehicle controller power supply and the negative pole of the power supply.

[0017] Furthermore, two ends of the key switch are respectively connected to one end of the relay switch 1 and a signal output end of the main control of the control device.

[0018] Technical effects and advantages of the utility model:

[0019] 1. Compared with the prior art, the seat sensor is used to detect whether the driver is in a normal driving position, thereby controlling whether the vehicle is allowed to start with the key, which to a certain extent avoids the potential safety hazards caused by the driver being able to start the vehicle with the key when the driver is in an abnormal driving position; the forklift is detected by detecting the gear switch signal, the front and rear tilt switch signal of the mast, and the lifting and lowering switch signal of the forklift, and by judging whether the forklift is in a safe state, thereby controlling whether the forklift power supply is allowed to start, which to a certain extent avoids the potential safety hazards caused by the vehicle power supply system working in an unsafe state;

[0020] 3. Compared with the existing technology, the seat sensor, key switch, battery power supply, power supply, instrument and vehicle controller power supply are used to judge whether the driver is in a safe driving state and whether the forklift power supply system is in a safe state, so as to control whether the power supply, instrument and vehicle controller power supply are allowed to start. To a certain extent, it avoids the potential safety hazards caused by the power supply, instrument and vehicle controller power supply when the driver is in an unsafe driving state and the forklift power supply system is in an unsafe state. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the overall structural frame diagram of the utility model.

[0022] Figure 2 This is a structural block diagram of the power supply safety control device of the utility model.

[0023] Figure 3 This is a control logic block diagram of the utility model.

[0024] The accompanying drawings are marked as follows:

[0025] 1. Power supply safety control device;

[0026] 11. Power control unit;

[0027] 12. Main control of control device;

[0028] 13. First relay; 131. Wire package 1; 132. Relay switch 1;

[0029] 14. Second relay; 141. Wire package 2; 142. Relay switch 2;

[0030] 15. The third relay; 151. The third wire package; 152. The third relay switch;

[0031] 2. Seat sensor; 3. Key switch;

[0032] 4. Battery power supply; 41. Battery positive pole; 42. Battery negative pole;

[0033] 5. Power supply for instruments and vehicle controller;

[0034] 51. The positive pole of the power supply for the instrument and vehicle controller; 52. The negative pole of the power supply for the instrument and vehicle controller;

[0035] 6. Power supply; 61. Positive pole of power supply; 62. Negative pole of power supply;

[0036] 7. Generator power supply; 71. Engine power supply positive pole; 72. Engine power supply negative pole;

[0037] 8. Gear switch; 9. Front and rear tilt switch;

[0038] 10. Lifting and lowering switch. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0040] As attached Figure 1 , Attachment Figure 2 and attached Figure 3 The power safety control system of an internal combustion forklift shown in the figure comprises: a power safety control device 1, a seat sensor 2, a key switch 3, a battery power supply 4, an instrument and vehicle controller power supply 5, a power supply 6 and a generator power supply 7;

[0041] Among them, the seat sensor 2 is used to detect whether the driver is in a normal driving position; the key switch 3 is used to provide a key switch 3 signal; the battery power supply 4 provides a battery power supply 4 signal to the control device main control 12; the instrument and vehicle controller power supply 5 is used to provide an instrument and vehicle controller power supply 5 signal; the power supply 6 is used to provide a power supply 6 signal;

[0042] The power supply safety control device 1 comprises: a power supply control unit 11, a control device main control 12, a first relay 13, a second relay 14 and a third relay 15,

[0043] The signal output end of the control device main control 12 is connected to the signal input end of the power control unit 11, the signal output end of the seat sensor 2 is respectively connected to the signal input end of the power control unit 11 and the signal input end of the control device main control 12, the signal output end of the control device main control 12 is respectively connected to the signal input ends of the first relay 13, the second relay 14 and the third relay 15, the signal output end of the battery power supply 4 is connected to the signal input end of the control device main control 12 through the first relay 13 and the key switch 3, the signal output end of the power power supply 6 and the signal output end of the instrument and vehicle controller power supply 5 are both connected to the signal input end of the control device main control 12, the generator power supply 7 is connected to the power power supply 6 through the second relay 14, and the generator power supply 7 is connected to the instrument and vehicle controller power supply 5 through the third relay 15.

[0044] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the system also includes: a gear switch 8, a forward and backward tilt switch 9 and a lifting and lowering switch 10;

[0045] The signal output end of the shift switch 8, the signal output end of the forward and backward tilt switch 9 and the signal output end of the lifting and lowering switch 10 are all connected to the signal input end of the control device main control 12;

[0046] Among them, the gear switch 8 is used to provide the gear switch 8 signal; the front and rear tilt switch 9 is used to provide the front and rear tilt signal of the mast; the lifting and lowering switch 10 is used to provide the lifting and lowering switch 10 signal of the fork.

[0047] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the first relay 13 includes: a coil 131 and a relay switch 132;

[0048] The signal output end of the control device main control 12 is connected to the coil 131, and the two ends of the relay switch 132 are respectively connected to one end of the key switch 3 and the signal output end of the battery power supply 4.

[0049] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the second relay 14 includes: a second coil 141 and a second relay switch 142;

[0050] The signal output end of the control device main control 12 is connected to the second coil 141, and the two ends of the second relay switch 142 are connected to the power supply 6 and the generator power supply 7 respectively.

[0051] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the third relay 15 includes: a coil 3 151 and a relay switch 3 152;

[0052] The signal output end of the control device main control 12 is connected to the wire package three 151, and the two ends of the relay switch three 152 are respectively connected to the instrument and vehicle controller power supply 5 and the generator power supply 7;

[0053] The negative electrode of the generator power supply 7 is respectively connected to the negative electrode of the wire package 1 131, the wire package 2 141, the wire package 3 151, the negative electrode of the battery power supply 4, the negative electrode of the instrument and vehicle controller power supply 5 and the negative electrode of the power supply 6;

[0054] Among them, Figure 3 As shown, the battery power source 4 includes: a battery positive electrode 41 and a battery negative electrode 42;

[0055] The instrument and vehicle controller power supply 5 includes: an instrument and vehicle controller power supply positive electrode 51 and an instrument and vehicle controller power supply negative electrode 52;

[0056] The power supply 6 includes: a power supply positive electrode 61 and a power supply negative electrode 62;

[0057] The engine power supply 7 includes: an engine power supply positive electrode 71 and an engine power supply negative electrode 72;

[0058] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, two ends of the key switch 3 are respectively connected to one end of the relay switch 132 and the signal output end of the control device main control 12.

[0059] A method for a power safety control system for an internal combustion forklift, the specific operation steps are as follows:

[0060] S1: Detect whether the driver is in a normal driving state through seat sensor 2:

[0061] If the driver sits on the seat, it is considered that the driver is in a normal driving state, and the seat sensor 2 outputs a low-level signal to the power control unit 11 to trigger its conduction, and then enters S2;

[0062] If the driver leaves the seat, it is considered that the driver is in an abnormal driving state, and the seat sensor 2 outputs a high level signal to the power control unit 11, and then enters S3;

[0063] S2: If the seat sensor 2 signal, the key switch 3 signal, the battery power 4 signal, the power power 6 signal and the instrument and vehicle controller power 5 signal are all low levels, it is determined that the forklift power system is in a safe state. In this safe state, the control device main control 12 outputs a signal to control the wire package 131 of the first relay 13. At this time, the wire package 131 is energized, and the relay switch 132 is closed, allowing the key switch 3 to be turned on to start the vehicle; then enter S4;

[0064] S3: At this time, it is determined that the forklift power supply system is in an unsafe state. In the unsafe state, the control device main control 12 outputs a signal to control the line package 131 of the first relay 13 to lose power, and the relay switch 132 is disconnected, and the key switch 3 is not allowed to start the vehicle, thereby completing the power supply safety control function;

[0065] S4: close the key switch 3, start the forklift, the control device main control 12 is powered on and starts working, and the control device main control 12 cyclically detects the seat sensor 2 signal, the key switch 3 signal, the battery power supply 4 signal, the power supply 6 signal and the instrument and vehicle controller power supply 5 signal;

[0066] If the seat sensor 2 signal is low level, the key switch 3 signal is high level, the battery power supply 4 signal is high level, the power supply 6 signal is low level and the instrument and vehicle controller power supply 5 signal is low level, it is determined that the forklift power supply system is in a safe state, and then enters S5;

[0067] If not, the forklift power system is judged to be in an unsafe state, and then enters S6:

[0068] S5: In this safe state, the control device main control 12 outputs a signal to control the coil 3 151 of the third relay 15. At this time, the coil 3 151 is energized, and the relay switch 3 152 is closed. At this time, the power supply 5 of the instrument and the vehicle controller is energized, and the instrument and the vehicle controller start to work; then enter S7;

[0069] S6: In an unsafe state, the control device main control 12 outputs a signal to control the power package 3 151 of the third relay 15 to lose power, the relay switch 3 152 is disconnected, the instrument and vehicle controller power supply 5 are de-energized, and the instrument and vehicle controller do not work; thereby completing the safety control function of the instrument and vehicle controller power supply 5;

[0070] S7: When the main control 12 of the control device is powered on, the seat sensor 2 signal, the key switch 3 signal, the battery power 4 signal, the power supply 6 signal, the instrument and vehicle controller power 5 signal, the gear switch 8 signal, the front and rear tilt switch 9 signal for the mast and the lifting and lowering switch 10 signal are cyclically detected;

[0071] If the seat sensor 2 signal is low, the key switch 3 signal is high, the battery power 4 signal is high, the power power 6 signal is low, the instrument and vehicle controller power 5 signal is high, the gear switch 8 signal is neutral, the tilt switch 9 signal is neutral, and the lifting and lowering switch 10 signal is neutral, then it is determined that the forklift power system is in a safe state, and then enters S8;

[0072] Among them, the signal of the gear switch 8 is in the middle position, that is, the gear switch 8 is in the neutral position, the signal of the front and rear tilt switch 9 is in the middle position, that is, the front and rear tilt switch 9 will not perform a new tilt operation, and the signal of the lifting and lowering switch 10 is in the middle position, that is, the lifting and lowering switch 10 will not perform a new lifting operation;

[0073] If not, the forklift power system is judged to be in an unsafe state, and then enters S9:

[0074] S8: In this safety state, the control device main control 12 outputs a signal to control the second coil 141 of the second relay 14. At this time, the second coil 141 is energized, and the relay switch 142 is closed. At this time, the power supply 6 is energized, and power operation is allowed; then enter S10;

[0075] S9: In an unsafe state, the control device main control 12 outputs a signal to control the second coil 141 of the second relay 14 to lose power, and the relay switch 142 is disconnected, so as to control the power supply 6 to lose power, thereby completing the safety control function of the power supply 6;

[0076] S10: When the forklift is in working state, the control device main control 12 detects the seat sensor 2 signal, the key switch 3 signal, the power supply 6 signal and the instrument and vehicle controller power supply 5 signal;

[0077] If the seat sensor 2 signal is low level, the key switch 3 signal is high level, the power supply 6 signal is high level, and the instrument and vehicle controller power supply 5 signal is high level, then it is judged that the forklift power supply system is in a safe state; the forklift power supply system is working normally and is not under control;

[0078] If the seat sensor 2 signal and the key switch 3 signal are both high level, or the power supply 6 signal is low level, or the instrument and vehicle controller power supply 5 signal is low level, it is determined that the forklift power supply system is in an unsafe state; then enter S11;

[0079] S11: When the signal of the seat sensor 2 is at a high level and lasts for more than 1.5 seconds, it is determined that the driver is not in the normal driving position. At this time, the control device main control 12 outputs a signal to control the second package 141 of the second relay 14 to lose power, and the relay switch 142 is disconnected, so as to control the power supply 6 to lose power and start the safety control function of the power supply 6;

[0080] When the power supply 6 signal is at a low level, it is determined that the power supply 6 output is in a fault state. At this time, the control device main control 12 outputs a signal to control the second package 141 of the second relay 14 to lose power, and the relay switch 142 is disconnected, the power supply 6 is controlled to lose power, and the power supply 6 safety control function is started;

[0081] When the signal of the instrument and vehicle controller power supply 5 is at a low level, it is determined that the output of the instrument and vehicle controller power supply 5 is in a fault state. At this time, the control device main control 12 outputs a signal to control the line package 3 151 of the third relay 15 to lose power, and the relay switch 3 152 is disconnected, and the instrument and vehicle controller power supply 5 is controlled to lose power, completing the safety control function of the instrument and vehicle controller power supply 5; then enter S12;

[0082] S12: When the signal of the seat sensor 212 is at a high level, the power supply safety control device 1 is disconnected and stops working, and then returns to S1

[0083] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3As shown, in S2, after the control device main control 12 is powered on and starts working, the control device main control 12 controls the power control unit 11. At this time, no matter whether the seat sensor 2 outputs a low-level signal, the power control unit 11 is always in the on state.

[0084] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, in S11, when the key switch 3 signal and the power supply 6 signal are both at low levels, it is determined that the forklift is in a key-out state. At this time, the engine power has no output, and the control device main control 12 no longer controls the power control unit 11. The power control unit 11 is only controlled by the seat sensor 2 output signal.

[0085] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, when the forklift power supply system in S11 is in an unsafe state, one of the seat sensor 2, the key switch 3, the power supply 6, and the instrument and vehicle controller power supply 5 fails alone or multiple of them fail simultaneously.

[0086] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0087] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power safety control system for an internal combustion forklift, characterized in that: The system comprises: a power supply safety control device (1), a seat sensor (2), a key switch (3), a battery power supply (4), an instrument and vehicle controller power supply (5), a power supply (6) and a generator power supply (7); The power supply safety control device (1) comprises: a power supply control unit (11), a control device main control (12), a first relay (13), a second relay (14) and a third relay (15), The signal output end of the control device main control (12) is connected to the signal input end of the power control unit (11); the signal output end of the seat sensor (2) is respectively connected to the signal input end of the power control unit (11) and the signal input end of the control device main control (12); the signal output end of the control device main control (12) is respectively connected to the signal input ends of the first relay (13), the second relay (14) and the third relay (15); the signal output end of the battery power supply (4) is connected to the signal input end of the control device main control (12) through the first relay (13) and the key switch (3); the signal output end of the power power supply (6) and the signal output end of the instrument and vehicle controller power supply (5) are both connected to the signal input end of the control device main control (12); the generator power supply (7) is connected to the power power supply (6) through the second relay (14); and the generator power supply (7) is connected to the instrument and vehicle controller power supply (5) through the third relay (15).

2. According to claim 1, a power safety control system for an internal combustion forklift is characterized in that: The system further comprises: a gear switch (8), a forward and backward tilt switch (9) and a lifting and lowering switch (10); The signal output end of the gear switch (8), the signal output end of the forward and backward tilt switch (9) and the signal output end of the lifting and lowering switch (10) are all connected to the signal input end of the control device main control (12).

3. The internal combustion forklift power safety control system according to claim 1, characterized in that: The first relay (13) comprises: a coil package 1 (131) and a relay switch 1 (132); The signal output end of the control device main control (12) is connected to the coil package one (131), and the two ends of the relay switch one (132) are respectively connected to one end of the key switch (3) and the signal output end of the battery power supply (4).

4. The internal combustion forklift power safety control system according to claim 3, characterized in that: The second relay (14) comprises: a second coil (141) and a second relay switch (142); The signal output end of the control device main control (12) is connected to the second coil (141), and the two ends of the second relay switch (142) are respectively connected to the power supply (6) and the generator power supply (7).

5. The internal combustion forklift power safety control system according to claim 4, characterized in that: The third relay (15) comprises: a third coil (151) and a third relay switch (152); The signal output end of the control device main control (12) is connected to the wire package three (151), and the two ends of the relay switch three (152) are respectively connected to the instrument and vehicle controller power supply (5) and the generator power supply (7); The negative electrode of the generator power supply (7) is respectively connected to the first coil (131), the second coil (141), the third coil (151), the negative electrode of the battery power supply (4), the negative electrode of the instrument and vehicle controller power supply (5), and the negative electrode of the power supply (6).

6. The internal combustion forklift power safety control system according to claim 3, characterized in that: The two ends of the key switch (3) are respectively connected to one end of the relay switch 1 (132) and the signal output end of the control device main control (12).

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