Forklift overspeed alarm control loop and forklift

Abstract

The utility model discloses a forklift overspeed alarm control loop and a forklift. The forklift overspeed alarm control loop comprises a forklift battery, a display instrument, a forklift controller, an alarm and an alternating current motor. The display instrument is used for setting an alarm speed threshold value and transmitting the alarm speed threshold value to the forklift controller; the forklift controller is used for judging the detected rotating speed of the alternating-current motor and the received alarm speed threshold value, and controlling the alarm to give an alarm and reduce the rotating speed of the alternating-current motor when the rotating speed of the alternating-current motor is greater than the alarm speed threshold value, so that the rotating speed of the alternating-current motor is smaller than the alarm speed threshold value; the positive and negative poles of the forklift battery are respectively connected with the positive and negative terminals of the display instrument and the positive and negative terminals of the forklift controller to form a first power supply loop; the alarm and the alternating current motor are respectively connected with the forklift controller, and the display instrument is in communication connection with the forklift controller. According to the utility model, the forklift controller monitors the speed of the forklift in real time and controls the alarm to give an alarm without an externally-hung device, so that the structure and the performance are more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of forklift overspeed alarm, in particular to a forklift overspeed alarm control circuit and a forklift. Background Art

[0002] Electric forklifts are developing rapidly with their high efficiency, quietness, energy saving and pollution-free features. The energy structure of forklifts is also gradually changing from fuel-based to electricity-based. The use of forklifts is more complicated than that of cars. How to regulate driving and drive safely has become one of the important considerations for customers and the market. At present, the overspeed alarm of forklifts is mostly realized by external structures. The external alarm is installed in the aftermarket to monitor the speed of the forklift. This solution has the following problems:

[0003] 1. The external structure is installed by customers in the later market according to their own needs. Therefore, the stability of the external structure is poor. By installing a device on the outside of the forklift body alone, the stability is difficult to ensure, and the speed structure and stability of the forklift need to be destroyed.

[0004] 2. The speed measurement method of the external speeding alarm adopts the speed measurement principle of the wireless sensor, so there is a risk of inaccurate speed measurement, and it is difficult to accurately judge the vehicle speed. Therefore, the external structure has the probability of false alarm, which will greatly reduce the accuracy of the speeding alarm and easily cause danger;

[0005] 3. The external overspeed alarm device cannot adjust the alarm parameters at will. Once the manufacturer completes the settings, the customer cannot set the parameters by themselves. For complex working conditions such as forklifts, its applicability cannot meet the needs of various complex working conditions. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a forklift overspeed alarm control circuit and a forklift to overcome the technical problems existing in the prior art.

[0007] In a first aspect, an embodiment of the utility model provides a forklift overspeed alarm control circuit, comprising: a forklift battery, a display instrument, a forklift controller, an alarm, and an AC motor;

[0008] The display instrument is used to set the alarm speed threshold and transmit the alarm speed threshold to the forklift controller; the forklift controller is used to determine the difference between the detected AC motor speed and the received alarm speed threshold, and when the AC motor speed is greater than the alarm speed threshold, control the alarm to sound an alarm and reduce the AC motor speed so that the AC motor speed is less than the alarm speed threshold;

[0009] The positive and negative electrodes of the forklift battery are respectively connected to the positive and negative terminals of the display instrument and the positive and negative terminals of the forklift controller to form a first power supply circuit;

[0010] The alarm and the AC motor are respectively connected to the forklift controller, and the display instrument is communicatively connected to the forklift controller.

[0011] In a preferred embodiment of the utility model, it also includes: a DC-DC converter, which is used to convert the first DC voltage into a second DC voltage and form a second power supply circuit with the alarm and the forklift battery.

[0012] In a preferred embodiment of the utility model, an encoder is also included for detecting the rotation speed of the AC motor and connected to the forklift controller.

[0013] In a preferred embodiment of the present invention, the circuit connecting the alarm and the DC-DC converter includes a relay, and two ends of the coil of the relay are connected to the driving pins 1A2 and 1A3 of the forklift controller.

[0014] In a preferred embodiment of the present invention, the communication connection between the display instrument and the forklift controller is specifically a communication connection through a CAN harness.

[0015] In a preferred embodiment of the utility model, the second power supply circuit further includes a key switch and an emergency stop switch, the key switch and the emergency stop switch are connected in series, wherein one end of the key switch is connected to the control end of the DC-DC converter.

[0016] In a preferred embodiment of the present invention, the key switch is connected to one end of the control end of the DC-DC converter, and is also connected to the display instrument 2A1 and the forklift controller 1A1 end, and is used to power on and off the display instrument and the forklift controller.

[0017] In a second aspect, an embodiment of the utility model provides a forklift, wherein the forklift adopts the forklift overspeed alarm control circuit described in the first aspect to control the overspeed alarm.

[0018] The present invention brings the following beneficial effects

[0019] 1. The overspeed alarm control circuit proposed in this application is simple and effective, which can effectively control the speed of the forklift during operation and greatly reduce the safety hazards caused by excessive speed;

[0020] 2. In view of the differences in the usage environments of different customers, this application adjusts the overspeed alarm threshold of the forklift at any time through the instrument to meet the arbitrary configuration of different customers for the actual usage environment;

[0021] 3. This application uses the forklift controller VCU to monitor the vehicle speed in real time and control the alarm device to issue an alarm reminder. It does not need to trigger the alarm through an external structure, and the structure and performance are more stable.

[0022] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of a forklift overspeed alarm control circuit provided by an embodiment of the utility model;

[0026] Figure 2 A wiring diagram of a forklift overspeed alarm control circuit provided by an embodiment of the utility model;

[0027] Icons: 1-forklift battery, 2-second fuse, 3-first fuse, 4-emergency stop switch, 5-key switch, 6-DC-DC converter, 7-relay coil, 8-relay contacts, 9-alarm, 10-display instrument, 11-CAN wiring harness, 12-forklift controller, 13-AC motor, 100-instrument unit, 200-forklift controller VCU, 201-logic judgment module, 202-power module, 203-I / O drive module, 300-alarm device. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the utility model.

[0029] Embodiment 1

[0030] The embodiment of the utility model provides a forklift overspeed alarm control circuit, comprising: a forklift battery, a display instrument, a forklift controller, an alarm and an AC motor;

[0031] The display instrument is used to set the alarm speed threshold and transmit the alarm speed threshold to the forklift controller; the forklift controller is used to determine the difference between the detected AC motor speed and the received alarm speed threshold, and when the AC motor speed is greater than the alarm speed threshold, control the alarm to sound an alarm and reduce the AC motor speed so that the AC motor speed is less than the alarm speed threshold;

[0032] The positive and negative electrodes of the forklift battery are respectively connected to the positive and negative terminals of the display instrument and the positive and negative terminals of the forklift controller to form a first power supply circuit;

[0033] The alarm and the AC motor are respectively connected to the forklift controller, and the display instrument is communicatively connected to the forklift controller.

[0034] In a feasible implementation manner, it further includes: a DC-DC converter, which is used to convert the first DC voltage into a second DC voltage and form a second power supply circuit with the alarm and the forklift battery.

[0035] In a feasible implementation manner, an encoder is further included, which is used to detect the rotation speed of the AC motor and is connected to the forklift controller.

[0036] In a feasible implementation manner, the circuit connecting the alarm and the DC-DC converter includes a relay, and two ends of the coil of the relay are connected to the driving pins 1A2 and 1A3 of the forklift controller.

[0037] In a feasible implementation manner, the communication connection between the display instrument and the forklift controller is specifically a communication connection via a CAN harness.

[0038] In a feasible implementation manner, the second power supply circuit further includes a key switch and an emergency stop switch, wherein the key switch and the emergency stop switch are connected in series, wherein one end of the key switch is connected to the control end of the DC-DC converter.

[0039] In a feasible implementation manner, the key switch is connected to one end of the control end of the DC-DC converter, and is also connected to the display instrument 2A1 and the forklift controller 1A1 end, and is used to power on and off the display instrument and the forklift controller.

[0040] The overspeed alarm control circuit proposed in this application is simple and effective, which can realize effective control of the vehicle speed during the operation of the forklift, and greatly reduce the safety hazards caused by excessive speed. In view of the differences in the usage environments of different customers, this application adjusts the overspeed alarm threshold of the forklift at any time through the instrument to meet the arbitrary configuration of the actual usage environment of different customers. This application monitors the vehicle speed in real time through the forklift controller VCU and controls the alarm device to issue an alarm reminder. There is no need to trigger the alarm through an external structure, and the structure and performance are more stable.

[0041] In order to describe and explain the present embodiment in more detail, Figure 1 As shown, a specific example is given as follows:

[0042] The control loop composition principle of this example is as follows: Figure 1 As shown, it mainly consists of an instrument unit 100, which communicates with a forklift controller VCU (Vehicle Control Unit) via a CAN bus. Unit, vehicle controller) 200, modify the alarm parameters and other information through the instrument unit, and send it to the forklift controller VCU through the CAN bus for modification, so the customer can arbitrarily modify the alarm parameter threshold according to their own use environment; the forklift controller VCU200 is mainly composed of a logic judgment module 201, a power module 202, and an I / O drive module 203, wherein the logic judgment module 201 and the instrument unit 100 transmit signals through the CAN bus, and judge and process according to the parameter instructions modified in the instrument unit, and at the same time, the module will detect the current speed of the AC motor 13 in real time, and judge and process whether the current speed exceeds the speed threshold set by the instrument unit; the power module 202 mainly controls the speed and torque output of the AC motor 13 by controlling the output current, thereby controlling the running speed of the forklift; the I / O drive module 203 is used to drive the alarm device 300 set outside the forklift controller VCU200, and when there is voltage output at the I / O drive port, the alarm device 300 will be driven to alarm to achieve a reminder effect;

[0043] Working principle of the invention

[0044] During the operation of the forklift, the power module of the forklift controller VCU drives the AC motor to rotate. At the same time, the logic judgment module of the forklift controller VCU collects the speed of the AC motor in real time. The speed of the AC motor is transmitted to the logic judgment module of the forklift controller VCU in real time through the motor encoder; it is then converted into the current driving speed of the forklift. When the forklift driving speed exceeds the AC motor speed set in the logic judgment module, the logic judgment module will control the I / O driver module port to output a high-level voltage to drive the alarm device. The alarm device will alarm to remind the driver that he has exceeded the speed. The driver will slow down at this time, and the power module of the forklift controller VCU will reduce the output current to the AC motor, thereby reducing the motor speed. When the motor speed is lower than the set threshold, the I / O driver port will stop outputting a high level, and the alarm device will stop the alarm reminder.

[0045] In specific implementation, Figure 2As shown, the forklift controller VCU200 is implemented by the forklift controller 12, and the logic judgment module 201, the power module 202 and the I / O drive module 203 are all inside the forklift controller 12, and are specifically embodied in the forklift controller 12, specifically: 1A4, 1A5, 1A6, 1A7 of the forklift controller 12 are connected to the encoder to collect the motor speed in real time and transmit the speed to the logic judgment module of the forklift controller 12; U, V, W of the forklift controller 12 are connected to the AC motor 13, and the power module of the forklift controller 12 drives the AC motor to rotate; in this embodiment, the alarm device 300 is implemented by the alarm 9, 1A2 and 1A3 of the forklift controller 12 are connected to the two ends of the coil 7 of the relay controlling the alarm 9, and the logic judgment module of the forklift controller 12 will control the I / O drive module (i.e., 1A2 and 1A3) port to output a high level, so that the coil 7 of the relay is energized, and then the contact 8 of the relay is closed, so that the alarm 9 sends an alarm signal.

[0046] like Figure 2 The figure shows the wiring diagram of the overspeed alarm control circuit. The specific working process is as follows:

[0047] The forklift battery 1 is used to power the forklift controller 12, the display instrument 10, the DC-DC converter 6, etc., wherein the second fuse 2 and the first fuse 3 protect the circuit from short circuit and burning of electrical components. The emergency stop switch 4 is used when the forklift fails or loses control. Pressing the emergency stop switch can disconnect the circuit, and the forklift controller will be powered off in an emergency. The key switch 5 is used to control the power on of the forklift controller. Closing and disconnecting the key switch 5 powers on and off the forklift controller 12 and the display instrument 10. At the same time, the key switch 5 will control the normal operation and shutdown of the DC-DC converter 6; the DC-DC converter 6 mainly converts the voltage of the forklift battery 1 into a low voltage of 12V to power the alarm 9. The relay coil 7 is controlled by the driving pins 1A2 and 1A3 of the forklift controller. When the forklift is overspeeding, the forklift controller drives the pin to power on the relay coil, and then the relay contact S3 is closed. At this time, the alarm 9 buzzes and alarms in the 12V low-voltage circuit conduction state to remind the driver to slow down. After the driver slows down, the forklift controller port will collect the motor encoder information and convert it into vehicle speed. When the vehicle speed is lower than the alarm threshold, the forklift controller 12 will stop driving the two pins 1A2 and 1A3. At this time, the relay coil is powered off, and the contact S3 will disconnect the 12V circuit, and then the alarm 9 stops buzzing. The CAN harness 11 is connected between the display instrument 10 and the forklift controller 12. The overspeed alarm threshold can be changed only through instrument operation, and sent to the forklift controller 12 for execution through the CAN harness 11.

[0048] Embodiment 2

[0049] The embodiment of the utility model provides a forklift, wherein the forklift adopts the forklift overspeed alarm control circuit described in the first embodiment to control the overspeed alarm.

[0050] The forklift overspeed alarm control circuit used in the forklift provided in the embodiment of the utility model has the same technical features as the forklift overspeed alarm control circuit provided in the above embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0051] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the vehicle described above can refer to the corresponding process in the aforementioned device embodiment, and will not be repeated here.

[0052] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0056] Finally, it should be noted that the above embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A forklift overspeed alarm control circuit, characterized in that: include: Forklift battery (1), display instrument (10), forklift controller (12), alarm (9) and AC motor (13); The display instrument (10) is used to set an alarm speed threshold value and transmit the alarm speed threshold value to the forklift controller (12); the forklift controller (12) is used to determine the difference between the detected rotation speed of the AC motor (13) and the received alarm speed threshold value, and when the rotation speed of the AC motor (13) is greater than the alarm speed threshold value, control the alarm (9) to sound an alarm and reduce the rotation speed of the AC motor (13) so that the rotation speed of the AC motor (13) is less than the alarm speed threshold value; The positive and negative electrodes of the forklift battery (1) are respectively connected to the positive and negative terminals of the display instrument (10) and the positive and negative terminals of the forklift controller to form a first power supply circuit; The alarm (9) and the AC motor (13) are respectively connected to the forklift controller (12), and the display instrument (10) is communicatively connected to the forklift controller (12).

2. The forklift overspeed alarm control circuit according to claim 1 is characterized in that: Also includes: The DC-DC converter (6) is used to convert the first DC voltage into a second DC voltage, and to form a second power supply circuit with the alarm (9) and the forklift battery (1).

3. The forklift overspeed alarm control circuit according to claim 2 is characterized in that: It also includes an encoder for detecting the rotation speed of the AC motor (13) and is connected to the forklift controller (12).

4. The forklift overspeed alarm control circuit according to claim 2 is characterized in that: The alarm (9) is connected to the DC-DC converter (6) in a circuit, which includes a relay, and the two ends of the coil of the relay are connected to the drive pins 1A2 and 1A3 of the forklift controller (12).

5. The forklift overspeed alarm control circuit according to claim 4 is characterized in that: The communication connection between the display instrument (10) and the forklift controller (12) is specifically a communication connection via a CAN wiring harness (11).

6. The forklift overspeed alarm control circuit according to claim 2 is characterized in that: The second power supply circuit further comprises a key switch (5) and an emergency stop switch (4), wherein the key switch (5) and the emergency stop switch (4) are connected in series, wherein one end of the key switch (5) is connected to a control end of a DC-DC converter (6).

7. The forklift overspeed alarm control circuit according to claim 6 is characterized in that: The key switch (5) is connected to one end of the control end of the DC-DC converter (6), and is also connected to the display instrument (10) 2A1 and the forklift controller (12) 1A1 end, and is used to power on and off the display instrument (10) and the forklift controller (12).

8. A forklift, characterized in that: The forklift adopts the forklift overspeed alarm control circuit described in any one of claims 1 to 7 to control the overspeed alarm.

Images