CN216105904U - Control system for speed limit of electric forklift for high-position lifting of whole forklift - Google Patents
Control system for speed limit of electric forklift for high-position lifting of whole forklift Download PDFInfo
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- CN216105904U CN216105904U CN202122425177.4U CN202122425177U CN216105904U CN 216105904 U CN216105904 U CN 216105904U CN 202122425177 U CN202122425177 U CN 202122425177U CN 216105904 U CN216105904 U CN 216105904U
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Abstract
The utility model discloses a control system for limiting the speed of an electric forklift high-position lifting whole forklift, which belongs to the field of forklifts, and comprises a controller, a normally closed proximity switch, a relay, a DC-DC converter and a walking motor, wherein the normally closed proximity switch is used for detecting the lifting height of a forklift gantry; the output end of the controller is connected with a walking motor. According to the utility model, a lifting height position signal of the forklift gantry component can be detected through the normally closed proximity switch, when the forklift gantry is detected to be lifted to a preset height, the controller receives an electric signal, and the running speed of the whole forklift is automatically limited by adjusting the speed of the running motor, so that the running stability and safety of the whole forklift during lifting of the gantry are ensured.
Description
Technical Field
The utility model relates to the field of forklifts, in particular to a control system for limiting the speed of a high-position lifting whole electric forklift.
Background
The electric forklift is characterized in that in the process of load lifting, along with the increase of the height, if the speed of the whole forklift is not controlled, the stability is reduced when a portal frame of the whole forklift is at a high position. Namely: if the forklift runs under a load, the forklift also performs lifting action to lift the goods to a certain high position, and especially the combined operation of lifting under the load and walking of the whole forklift is easy to cause the stability of the whole forklift to be reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that an electric forklift has an active speed limiting function when a portal frame is lifted to a fixed height position, and improves the stability and safety of a whole vehicle.
In order to achieve the purpose, the utility model provides the following technical scheme:
a control system for limiting the speed of an electric forklift by lifting the whole forklift at a high position comprises a controller, a normally closed proximity switch, a relay, a DC-DC converter and a walking motor, wherein the normally closed proximity switch is used for detecting a lifting height position signal of a gantry component which acts at first by the forklift, a relay coil and the normally closed proximity switch are sequentially connected with the output end of the DC-DC converter, the input end of the DC-DC converter is connected to a battery power supply and the power supply input end of the controller, and a normally open contact of the relay is connected to a 48V battery power supply and the lifting height position signal input end of the controller; the output end of the controller is connected with the walking motor, the rotating speed of the walking motor is controlled, a speed encoder signal is monitored in real time, and the vehicle speed is displayed on the instrument.
As a development of the utility model, the controller is connected to the display instrument via a CAN bus.
As an improved scheme of the utility model, the input end of the controller is also respectively connected with a forward switch and a backward switch, and the speed limit is associated with the driving direction.
As a development of the utility model, the forward switch, the backward switch and the acceleration analog signal are integrated into a thumb switch form.
Has the advantages that: the utility model can detect the lifting height of the forklift gantry through the normally closed proximity switch, when the lifting height of the forklift gantry is detected to be a preset height, the controller receives a lifting height position signal, and automatically limits the running speed of the whole forklift by adjusting the rotating speed of the walking motor, thereby ensuring the running stability and safety of the whole forklift during lifting of the gantry.
Drawings
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a schematic view of the proximity switch installation of the present invention.
In the figure: 1-a forward switch; 2-a back-off switch; 3-an analog signal; 4-thumb switch; 5-a relay; 6-position sensing plate; 7-normally closed proximity switch; an 8-DC-DC converter; 9-a battery power supply; 10-a controller; 11-display instrument; 12-a speed encoder; 13-a walking motor; 14-a drive gearbox; 15-driving wheels; 16-mounting a bracket.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A control system for limiting the speed of a whole electric forklift in a high-position lifting mode comprises a controller 10, a normally closed proximity switch 7, a relay 5, a DC-DC converter 8 and a traveling motor 13. As shown in fig. 2, the normally closed proximity switch 7 is arranged on the mounting bracket 16, the mounting bracket 16 is mounted on the outer gantry, the position sensing plate 6 is mounted on the gantry part which is actuated by the forklift first, and the normally closed proximity switch 7 can be used for sensing a position distance signal between the normally closed proximity switch and the position sensing plate 6 so as to detect a lifting height position signal of the forklift gantry part. For example, for the basic type portal frame of the electric forklift, only an outer portal frame and an inner portal frame are included, the inner portal frame lifts relative to the outer portal frame, a normally closed proximity switch 7 is installed on the outer portal frame which cannot act, wiring, fixing and the like are convenient, and a position sensing plate 6 is installed at the top of the inner portal frame. For a three-stage full-free gantry, the position sensing plate 6 is mounted on the rear frame of the side shifter, and the normally closed proximity switch 7 is still mounted on the stationary outer gantry.
The lifting speed limit standards of the forklift are different, the speed limit is only carried out by the three-stage full-free gantry inner gantry movement of the Australia standard forward-moving type forklift, and the risk of instability of the forklift actually exists in application. According to the latest CE standard EN 1175-2020, after the pallet fork is lifted to 400mm, the speed of the whole truck needs to be limited to 6km/h, and compared with the Australia standard, the CE standard provides higher requirements for the stability of the forklift. The position sensing plate 6 is arranged and installed on a door frame component (an inner door frame or a rear frame of a side shifter) which acts firstly by adopting the latest CE standard, the length size of the position sensing plate 6 is less than or equal to 400mm, the size and the position are adjustable, and when a fork of the forklift rises to the induction disconnection of the normally closed proximity switch 7 and the position sensing plate 6, the forklift immediately receives a speed limiting signal. In practical application, the length and the size of the position sensing plate 6 are adjustable, and the position can be changed, so that the speed limiting device is suitable for being applied to various portal lifting finished automobile speed limiting cases.
As shown in fig. 1, the DC-DC converter 8 is connected to the battery power supply 9, and can convert the 48V battery power supply 9 into a 12V power supply for the normally closed proximity switch 7 and other 12V electrical components of the vehicle. A coil of the relay 5 and the normally closed proximity switch 7 are sequentially connected with a 12V output end of the DC-DC converter 8, a diode is also connected in parallel with the coil of the relay 5, a 48V input end of the DC-DC converter 8 is connected to a 48V battery power supply 9 and a power supply input end of the controller 10, and a normally open contact of the relay 5 is connected to a lifting height position signal input end (an S4 end) of the battery power supply 9 and the controller 10; the controller 10 is connected with a walking motor 13 through a U/V/W three-phase line and is connected with a speed encoder 12 through a detection data line, an output shaft of the walking motor 13 is connected with a driving gear box 14, the driving gear box 14 transmits power to a driving wheel 15, the driving gear box 14 is used for converting the rotating speed of the traction motor and changing the running direction, and the driving wheel 15 is used for the whole vehicle to run.
The speed limiting principle of the control system is as follows:
the normally closed proximity switch 7 senses a position sensing plate 6 on the portal component, when the portal component is separated from the sensing distance (the sensing distance can be set to be 5mm), the normally closed proximity switch 7 is in a closed state, a loop connected with a coil of the relay 5 and the DC-DC converter 8 outputs 12V voltage, the coil of the relay 5 is electrified, a normally open contact is attracted and conducted, a 48V battery power supply 9 outputs 48V to an S4 end of the controller 10, the controller 10 processes the speed encoder 12 after receiving a 48V speed limiting signal, the rotating speed of the walking motor 13 is regulated and controlled, the speed of the whole vehicle is reduced, and the speed limiting of the whole vehicle with the portal lifted to a fixed position is realized. Because the signal that normally closed proximity switch 7 gathered has carried out voltage signal's conversion processing through relay 5, can realize the wide voltage signal scope of adaptation controller signal monitoring end.
Due to the fact that the normally closed proximity switch 7 is adopted, when the normally closed proximity switch 7 induces the position induction plate 6, the normally closed proximity switch 7 is switched off, no 12V electric signal is output, the coil end of the relay 5 cannot be driven, the controller 10 cannot receive a 48V speed-limiting electric signal, and therefore the speed of the whole vehicle is not limited.
In some embodiments, the controller 10 is connected to the display instrument 11 through the CAN bus, and the display instrument 11 CAN display the driving state, the speed limit parameter, and the like of the whole vehicle. The input ends S1, S2 and S3 of the controller are respectively connected with the forward switch 1, the backward switch 2 and the analog signal 3, and the three are integrated into a thumb switch 4 form, so that the forward and backward functions of the forklift can be conveniently controlled. Here, the display meter is a SMART meter, has an editable function, and can modify parameters of turn. For example, the efficiency and stability balance is pursued in the forward state, the speed is limited to 6km/h after the gantry is lifted for 400mm, the safety stability is mainly adopted in the backward state, the speed is limited to 4km/h after the gantry is lifted, the forward switch 1 and the backward switch 2 are switched, the forward and backward conversion of the forklift can be realized, and the speed limit parameters in the forward and backward states can be intelligently modified through the display instrument.
The utility model can detect the lifting height of the forklift gantry through the normally closed proximity switch, when the lifting height of the forklift gantry is detected to be preset, the controller receives an electric signal, and the running speed of the whole forklift is automatically limited by adjusting the speed encoder of the running motor, so that the running stability and safety of the whole forklift during lifting of the gantry are ensured.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (5)
1. A control system for limiting the speed of a whole electric forklift by high-position lifting is characterized by comprising a controller, a normally closed proximity switch, a relay, a DC-DC converter and a walking motor, wherein the normally closed proximity switch is used for detecting a lifting height position signal of a gantry component which is firstly actuated by the forklift, a relay coil and the normally closed proximity switch are sequentially connected with the output end of the DC-DC converter, the input end of the DC-DC converter is connected to a battery power supply and the power supply input end of the controller, and a normally open contact of the relay is connected with the battery power supply and the lifting height position signal input end of the controller; the controller is connected with the walking motor.
2. The control system for limiting the speed of the whole electric forklift for high-position lifting according to claim 1, wherein the normally closed proximity switch is mounted on an outer gantry, a gantry component which is actuated by the forklift firstly is provided with a position sensing plate, and the height of the position sensing plate is less than or equal to 400 mm.
3. The control system for limiting the speed of a whole high-lift truck of an electric forklift according to claim 1, wherein the controller is connected to the speed encoder through a detection data line and connected to the display instrument through a CAN bus.
4. The control system for limiting the speed of the whole electric forklift high-rise vehicle according to claim 1, wherein a forward switch and a backward switch are further connected to an input end of the controller respectively.
5. The control system for limiting the speed of a whole electric forklift high-lift vehicle according to claim 4, wherein the forward switch, the backward switch and the analog quantity signals for acceleration are integrated into a thumb switch form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122425177.4U CN216105904U (en) | 2021-09-30 | 2021-09-30 | Control system for speed limit of electric forklift for high-position lifting of whole forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122425177.4U CN216105904U (en) | 2021-09-30 | 2021-09-30 | Control system for speed limit of electric forklift for high-position lifting of whole forklift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216105904U true CN216105904U (en) | 2022-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122425177.4U Active CN216105904U (en) | 2021-09-30 | 2021-09-30 | Control system for speed limit of electric forklift for high-position lifting of whole forklift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216105904U (en) |
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2021
- 2021-09-30 CN CN202122425177.4U patent/CN216105904U/en active Active
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