Forklift gantry lifting control system

Abstract

The utility model discloses a forklift gantry lifting control system which comprises a power source, an oil pump controller, a lifting potentiometer, a key switch, a relay, a lifting switch, a descending switch and a pedal switch. The anode of the power supply is connected with a switch of the relay and the key switch, the other end of the key switch is connected to a KEY port of the oil pump controller, and the cathode of the oil pump controller is connected to the cathode of the power supply. The other end of the relay switch is connected to the anode input end of the oil pump controller; a coil of the relay is connected to the oil pump controller in parallel. A port C0 of the oil pump controller is connected with the key switch through the lifting switch, a port C1 of the oil pump controller is connected with the key switch through the descending switch, and a port C2 of the oil pump controller is connected with the key switch in series through the pedal switch. The lifting potentiometer is connected with the oil pump controller; the oil pump controller controls the rotating speed of the oil pump motor. The oil pump motor can realize output at different rotating speeds according to external load requirements of the forklift gantry, hydraulic oil is supplied as required, and the efficiency of the whole forklift is improved.

Description

Technical Field

[0001] The utility model relates to the field of forklift manufacturing, in particular to a forklift door frame lifting control system. Background Art

[0002] OPS stands for Operator Presence Sensing. Currently, the lifting and lowering OPS controls used in forklifts generally detect the signal of the foot switch or the seat gravity sensor, and use a single valve-controlled switch in the lifting and lowering valve stem of the multi-way valve to trigger the switch quantity, and input the relevant signal to the vehicle controller to determine whether the operator is present, and then control the opening and closing of the lowering oil port of the multi-way valve, so that the mast cannot be lowered when the operator is not in the driving position. This control scheme has the following problems:

[0003] 1) When the mast is lifted, because the lifting and lowering share a switch and output switch signal, the oil pump motor cannot match the speed on demand and can only output a constant speed to supply hydraulic oil, increasing the energy consumption of the vehicle;

[0004] 2) When the gantry is lifted, the oil pump motor cannot enter the idle state in advance, resulting in a slow response speed of the oil pump motor and poor micro-motion performance of the gantry lifting. Utility Model Content

[0005] The purpose of the utility model is to provide a forklift mast lifting control system to solve the problems raised in the above-mentioned background technology. The oil pump motor can output different speeds according to the external load requirements of the forklift mast, and the hydraulic oil is supplied on demand to improve the efficiency of the entire vehicle.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A forklift mast lifting control system, comprising a power supply, an oil pump controller, a lifting potentiometer, a key switch, a relay, a lifting switch, a lowering switch and a pedal switch;

[0008] The positive electrode of the power supply is connected to the switch of the relay and the key switch respectively, the other end of the key switch is connected to the KEY port of the oil pump controller, and the negative electrode of the oil pump controller is connected to the negative electrode of the power supply; the other end of the relay switch is connected to the positive input terminal of the oil pump controller; the coil of the relay is connected in parallel between port 1 and port 2 of the oil pump controller; port C0 of the oil pump controller is connected to the key switch through the lifting switch, port C1 of the oil pump controller is connected to the key switch through the lowering switch, and port C2 of the oil pump controller is connected in series with the key switch through the pedal switch; the lifting potentiometer is connected to the oil pump controller;

[0009] It also includes an oil pump and an oil pump motor, and the oil pump is connected to port 6 of the oil pump controller through the oil pump motor.

[0010] As a further solution of the utility model: it also includes an emergency stop switch connected in series between the key switch and the positive pole of the power supply.

[0011] As a further solution of the utility model: it also includes a first fuse connected in series between the emergency stop switch and the positive pole of the power supply.

[0012] As a further solution of the utility model: the lifting potentiometer is a three-terminal potentiometer, and its three ports are respectively connected to port 3, port 4, and port 5 of the oil pump controller.

[0013] As a further solution of the utility model: the relay switch is connected to the positive input terminal of the oil pump controller through a second fuse.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model realizes the output of adjusting the speed of the oil pump motor according to the external load demand of the forklift mast, and the hydraulic oil is supplied on demand, so as to avoid the oil pump motor always running at a high speed, resulting in excessive oil overflow and increasing the energy consumption of the whole vehicle. Through the cooperation of the lifting switch and the lifting potentiometer, the oil pump motor can respond to enter the idle state in advance, improve the micro-motion performance of the mast lifting, and increase the mast lifting speed; the rising switch and the falling switch are controlled separately, the control logic is simple and clear, and the reliability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the circuit principle diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the connection between the lifting potentiometer, the lifting switch, the lowering switch and the multi-way valve in the utility model;

[0018] In the figure: 1-power supply, 2-oil pump controller, 3-lifting potentiometer, 4-key switch, 5-relay, 6-lifting switch, 7-lowering switch, 8-pedal switch, 9-oil pump, 10-oil pump motor, 11-emergency stop switch, 12-first fuse, 13-second fuse, 14-multi-way valve, 141-valve stem, 142-bracket. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a communication 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figure 1-2 In the embodiment of the utility model, a forklift mast lifting control system includes a power supply 1, an oil pump controller 2, a lifting potentiometer 3, a key switch 4, a relay 5, a lifting switch 6, a lowering switch 7, a pedal switch 8, an oil pump 9 and an oil pump motor 10; wherein:

[0023] The positive pole of power supply 1 is connected to the switch of relay 5 and key switch 4 respectively, the other end of key switch 4 is connected to the KEY port of oil pump controller 2, and the negative pole of oil pump controller 2 is connected to the negative pole of power supply 1; the other end of relay 5 switch is connected to the positive input terminal of oil pump controller 2; the coil of relay 5 is connected in parallel between port 1 and port 2 of oil pump controller 2; port C0 of oil pump controller 2 is connected in series with key switch 4 through lifting switch 6, port C1 of oil pump controller 2 is connected in series with key switch 4 through descending switch 7, and port C2 of oil pump controller 2 is connected in series with key switch 4 through pedal switch 8; lifting potentiometer 3 is connected to oil pump controller 2; oil pump 9 is connected to port 6 of oil pump controller 2 through oil pump motor 10.

[0024] Furthermore, it also includes an emergency stop switch 11 connected in series between the key switch 4 and the positive pole of the power supply 1.

[0025] Furthermore, it also includes a first fuse 12 connected in series between the emergency stop switch 11 and the positive pole of the power supply 1.

[0026] Furthermore, the lifting potentiometer 3 is a three-terminal potentiometer, and its three ports are respectively connected to port 3, port 4, and port 5 of the oil pump controller 2.

[0027] Furthermore, the relay 5 switch is connected to the positive input terminal of the oil pump controller 2 through the second fuse 13 .

[0028] The basic working principle of the utility model is as follows: the power supply 1 supplies power to the oil pump controller 2, the oil pump motor 10, etc.; the lifting switch 6 and the lowering switch 7 output switch signals, and the lifting potentiometer 3 outputs analog signals (0-12V). The working principle is as follows: turn on the key switch 4, wake up the oil pump controller 2, the relay 5 switch is powered on and closed, and then the lifting switch 6, the lowering switch 7 and the lifting potentiometer 3 can be triggered by operating the valve stem 141, and the signal is input to the oil pump controller 2, and then the oil pump motor 10 performs work according to the command of the oil pump controller 2, thereby realizing the lifting and lowering of the gantry, and the first fuse 12, the emergency stop switch 11 and the second fuse 13 protect the entire electrical circuit. When the utility model is working, it is connected to the multi-way valve 14, and the operator controls the multi-way valve 14 to realize the lifting and lowering control of the gantry. The multi-way valve 14 includes a valve stem 141 and a bracket 142. The lifting switch 6, the lowering switch 7 and the lifting potentiometer 3 are all assembled on the bracket 142 and electrically connected to the valve stem 141. The voltage signal change of the switch and the potentiometer is realized by manipulating the valve stem 141.

[0029] Micro-motion control of mast lifting: After the vehicle is powered on and the driver presses the pedal switch 8, when the operating valve stem 141 is at a very small angle, the lifting valve port of the multi-way valve opens and the lifting switch 6 closes. At this time, the oil pump motor 10 works at idle speed and outputs a speed of n1. The oil pump 9 supplies a small amount of oil to the mast system to achieve micro-motion lifting of the mast. When the operating valve stem 141 is operated at a larger angle, the speed of the oil pump motor 10 directly increases from n1 to nmax, which can achieve rapid response of the oil pump motor 10 and increase the mast lifting speed.

[0030] Energy-saving control of gantry lifting: After the vehicle is powered on, the driver steps on the pedal switch 8, and according to the lifting speed required by the load, the valve stem 141 is operated to open the lifting valve port of the multi-way valve. At this time, the lifting switch 6 is closed, the lowering switch 7 is disconnected, and the lifting potentiometer 3 outputs an analog signal (0-12V). The oil pump controller 2 gives an execution command. At this time, the oil pump motor 10 can output different speeds of the oil pump motor 10 according to the output signal of the lifting potentiometer 3, and the output speed is n0-nmax. Then, according to the lifting speed required by the load, the oil pump 9 can output oil on demand, thereby avoiding the oil pump motor 10 always running at a high speed, resulting in excessive oil overflow and increased energy consumption of the whole vehicle.

[0031] Mast lowering control: After the vehicle is powered on, the driver presses the pedal switch 8. When the valve stem 141 is operated to lower the mast, the descending valve port of the multi-way valve opens, the descending switch 7 closes, the lifting switch 6 opens, and the oil pump controller 2 gives an execution command. The speed n of the oil pump motor 10 is 0, so that the mast lifting and lowering are controlled separately. The logic is simple and clear, and the control strategy is more direct.

[0032] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0033] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A forklift mast lifting control system, characterized in that: It comprises a power supply (1), an oil pump controller (2), a lifting potentiometer (3), a key switch (4), a relay (5), a lifting switch (6), a lowering switch (7) and a pedal switch (8); The positive electrode of the power supply (1) is connected to the switch of the relay (5) and the key switch (4) respectively, the other end of the key switch (4) is connected to the KEY port of the oil pump controller (2), and the negative electrode of the oil pump controller (2) is connected to the negative electrode of the power supply (1); the other end of the relay (5) switch is connected to the positive input end of the oil pump controller (2); the coil of the relay (5) is connected in parallel between the port 1 and the port 2 of the oil pump controller (2); the port C0 of the oil pump controller (2) is connected to the key switch (4) through the lifting switch (6), the port C1 of the oil pump controller (2) is connected to the key switch (4) through the lowering switch (7), and the port C2 of the oil pump controller (2) is connected in series with the key switch (4) through the pedal switch (8); the lifting potentiometer (3) is connected to the oil pump controller (2); It also includes an oil pump (9) and an oil pump motor (10), and the oil pump (9) is connected to the port 6 of the oil pump controller (2) through the oil pump motor (10).

2. The forklift mast lifting control system according to claim 1, characterized in that: It also includes an emergency stop switch (11) connected in series between the key switch (4) and the positive pole of the power source (1).

3. The forklift mast lifting control system according to claim 2, characterized in that: It also includes a first fuse (12) connected in series between the emergency stop switch (11) and the positive pole of the power supply (1).

4. The forklift mast lifting control system according to claim 1, characterized in that: The lifting potentiometer (3) is a three-terminal potentiometer, and its three ports are respectively connected to port 3, port 4, and port 5 of the oil pump controller (2).

5. The forklift mast lifting control system according to claim 1, characterized in that: The relay (5) switch is connected to the positive input terminal of the oil pump controller (2) via a second fuse (13).

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