Fork lift control system

Abstract

The utility model relates to the technical field of cargo fork lifting, and concretely discloses a cargo fork lifting control system, including power module and state control module, power module includes the lifting cylinder for driving cargo fork to lift, state control module includes multiway valve, solenoid valve and micro -control unit, the oil inlet of multiway valve communicates with the oil tank, micro -control unit includes first micro -switch, second micro -switch and dialing lever, first micro -switch and second micro -switch all are with solenoid valve electric signal connection, when dialing lever rotates along the first direction, can trigger first micro -switch, make the oil outlet of multiway valve pass through this solenoid valve and the rodless cavity of lifting cylinder communication, when dialing lever rotates along the second direction, can trigger second micro -switch, make the oil outlet of multiway valve pass through this solenoid valve and the rod cavity of lifting cylinder communication, realize the control of lifting cylinder ascending state and descending state through dialing dialing lever, avoid the accident that causes due to the misoperation.

Description

Technical Field

[0001] This utility model relates to the technical field of fork lifting, and specifically to a fork lifting control system. Background Technology

[0002] The lifting action of the forks is performed by the lifting cylinder, but whether the lifting cylinder is activated or not needs to be controlled by the hydraulic valve. In the existing technology, multiple solenoid valves are usually used to control the entire hydraulic circuit. However, since solenoid valves are expensive, using multiple solenoid valves will increase the overall cost of the forklift. Therefore, some forklifts use multi-way valves to distribute the oil in the tank, which can significantly reduce costs.

[0003] However, after selecting a multi-way valve, the lifting state of the lifting cylinder is difficult to control, which may lead to misoperation. Moreover, the maximum lifting and lowering height of the forks is usually mechanically limited, and the adjustment of the highest or lowest height is troublesome. Utility Model Content

[0004] This utility model addresses the aforementioned problems and aims to provide a fork lifting control system that can precisely control the lifting state of the forks and facilitate adjustment of the highest or lowest fork height.

[0005] To achieve the above objectives, this utility model provides a fork lifting control system, comprising:

[0006] The power module includes a lifting cylinder, the piston rod of which is connected to the forks;

[0007] The status control module includes a multi-way valve, a solenoid valve, and a micro-motion control unit. The oil inlet of the multi-way valve is connected to the oil tank, and one oil outlet of the multi-way valve can be connected to the rod-side or rodless side of the lifting cylinder through the solenoid valve.

[0008] The micro-motion control unit includes a first micro-switch, a second micro-switch, and a lever. Both the first micro-switch and the second micro-switch are electrically connected to the solenoid valve.

[0009] The lever can be rotated in a first direction to trigger the first micro switch, so that one oil outlet of the multi-way valve is connected to the rodless chamber of the lifting cylinder through the solenoid valve;

[0010] The lever can be rotated in the second direction to trigger the second micro switch, so that one oil outlet of the multi-way valve is connected to the rod chamber of the lifting cylinder through the solenoid valve.

[0011] According to the fork lifting control system described above, the micro-motion control unit further includes a trigger rod and a mounting base. The lower end of the lever is rotatably mounted on the mounting base via a rotating shaft. One end of the trigger rod is connected to the lower end of the lever, and the trigger rod is provided with a first contact portion and a second contact portion arranged at intervals along its length.

[0012] When the lever rotates in the first direction, the first contact part abuts against the first micro switch; when the lever rotates in the second direction, the second contact part abuts against the second micro switch.

[0013] According to the forklift lifting control system described above, the trigger rod is provided with a limiting groove arranged along its length direction. The two side walls of the limiting groove are respectively formed with an inclined first abutment and an inclined second abutment. The ends of the first micro switch and the second micro switch are both located in the limiting groove. When the trigger rod moves along its length direction, the first abutment can abut against the inclined surface of the end of the first micro switch or the abutment can abut against the inclined surface of the end of the second micro switch.

[0014] According to the fork lifting control system described above, the first direction is clockwise, the second direction is counterclockwise, and the first contact part is located on the side of the limiting groove near the lever.

[0015] According to the forklift control system described above, the solenoid valve is provided with a first outlet and a second outlet. The first outlet is connected to the rodless chamber of the lifting cylinder, and the second outlet is connected to the rod chamber of the lifting cylinder. When the first micro switch is triggered, the oil inlet of the solenoid valve is connected to the first outlet, and when the second micro switch is triggered, the oil inlet of the solenoid valve is connected to the second outlet.

[0016] According to the fork lifting control system described above, the forks are mounted on the mast in a lifting manner, the mast is mounted on the front side of the frame, and the power module and the status control module are both mounted on the frame.

[0017] The fork lifting control system described above further includes a height control module, which includes an encoder fixed on the mast and used to monitor the height of the forks.

[0018] According to the fork lifting control system described above, the height control module further includes a control unit, which is electrically connected to both the lifting cylinder and the encoder. When the fork rises to a first preset height or falls to a second preset height, the control unit can control the lifting cylinder to stop operating.

[0019] According to the forklift lifting control system described above, the height control module further includes an operation panel, which is electrically connected to the control unit and used to set the first preset height and the second preset height.

[0020] The forklift control system described above also includes an emergency stop module, which includes an emergency stop switch. The emergency stop switch is electrically connected to the lifting cylinder and is used to control the lifting cylinder to stop moving.

[0021] This utility model has the following beneficial effects:

[0022] 1. By moving the lever in the first direction, when it triggers the first micro switch, the first micro switch can control one of the oil outlets of the multi-way valve to connect with the rodless chamber of the lifting cylinder through the solenoid valve, so that the lifting cylinder is in the rising state. By moving the lever in the second direction, when it triggers the second micro switch, the second micro switch can control one of the oil outlets of the multi-way valve to connect with the rod chamber of the lifting cylinder through the solenoid valve, so that the lifting cylinder is in the falling state. This allows for state control of the lifting cylinder, preventing it from rising and falling arbitrarily.

[0023] 2. The status control of the lifting cylinder only requires one solenoid valve, which has a low cost;

[0024] 3. The maximum and minimum height of the forks can be set via the display screen to meet the needs of different scenarios. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the forklift in the embodiment;

[0026] Figure 2 This is a schematic diagram of the assembly structure of the multi-way valve and the micro-motion control unit in an embodiment;

[0027] Figure 3 This is a schematic diagram of the oil circuit in an embodiment.

[0028] In the picture:

[0029] 100. Lifting cylinder; 200. Multi-way valve; 300. Solenoid valve; 400. Micro-motion control unit; 410. First micro switch; 420. Second micro switch; 430. Lever; 440. Trigger lever; 441. First contact part; 442. Second contact part; 450. Mounting base; 500. Encoder; 600. Emergency stop switch; 700. Forks; 800. Mast; 900. Frame. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] like Figure 1-3 As shown, a fork lifting control system includes a power module, a status control module, and a height control module. The power module provides power to the forks 700 to drive them to move up and down. The status control module controls the power module to be in an ascending or descending state. The height control module controls and adjusts the maximum ascending height and the minimum descending height of the forks 700 to ensure that it can be used in different situations.

[0032] In this embodiment, the fork 700 lifting control system is applied to the lifting control of goods in the forklift. The forklift generally includes a frame 900, a mast 800 located on the front side of the frame 900, and forks 700 that can be lifted and lowered on the mast 800. In this embodiment, the power module and the status control module are mounted on the frame 900, and the frame 900 provides support for them.

[0033] The power module includes a lifting cylinder 100, whose piston rod is connected to the forks 700 to drive the forks 700 to move up and down, thus enabling the picking up and putting down of goods. The lifting cylinder 100 has a rod chamber and a rodless chamber. When hydraulic oil is supplied to the rod chamber of the lifting cylinder 100, it drives the piston rod to retract, at which time the forks 700 move downward. When hydraulic oil is supplied to the rodless chamber of the lifting cylinder 100, it drives the piston rod to extend, at which time the forks 700 move upward.

[0034] Specifically, the status control module includes a multi-way valve 200, a solenoid valve 300, and a micro-motion control unit 400. The oil inlet of the multi-way valve 200 is connected to the oil tank, and one oil outlet of the multi-way valve 200 can be connected to the rod-side or rodless side of the lifting cylinder 100 through the solenoid valve 300. The micro-motion control unit 400 includes a first micro switch 410, a second micro switch 420, and a lever 430. Both the first micro switch 410 and the second micro switch 420 are connected to the solenoid valve 300. The solenoid valve 300 is electrically connected, and the lever 430 can rotate. When it rotates in the first direction, it triggers the first microswitch 410. The first microswitch 410 sends a signal and controls the valve core of the solenoid valve 300 to move, so that one oil outlet of the multi-way valve 200 is connected to the rodless chamber of the lifting cylinder 100 through the solenoid valve 300. That is, the solenoid valve 300 can connect the oil outlet of the multi-way valve 200 and the rodless chamber of the lifting cylinder 100. At this time, the lifting cylinder 100... When the lifting cylinder 100 is in the upward state, it can only drive the forks 700 to rise, but cannot drive them to fall. When the lever 430 rotates in the second direction, it can trigger the second micro switch 420. The second micro switch 420 sends a signal and controls the valve core of the solenoid valve 300 to move, so that one oil outlet of the multi-way valve 200 is connected to the rod chamber of the lifting cylinder 100 through the solenoid valve 300. That is, the solenoid valve 300 can connect the oil outlet of the multi-way valve 200 and the rod chamber of the lifting cylinder 100. At this time, only the rod chamber of the lifting cylinder 100 can receive oil, and it is in the downward state, which can only drive the forks 700 to fall, but cannot drive them to rise. The rotation direction of the lever 430 can be operated by the operator. After fixing the operating state of the lifting cylinder 100, the forks 700 can only move in one direction, which can avoid the forks 700 from rising or falling due to misoperation. Especially in some confined spaces, it can avoid the safety risks caused by misoperation.

[0035] Furthermore, to enable the lever 430 to trigger the first micro switch 410 and the second micro switch 420, the micro control unit 400 also includes a trigger rod 440 and a mounting base 450. The lower end of the lever 430 is rotatably mounted on the mounting base 450 via a pivot. One end of the trigger rod 440 is connected to the lower end of the lever 430, and the trigger rod 440 is provided with a first contact portion 441 and a second contact portion 442 spaced apart along its length. When the lever 430 rotates in the first direction, the first contact portion 441 abuts against the first micro switch 410. When the lever 430 rotates in the second direction, the second contact portion 442 abuts against the first micro switch 410. In this embodiment, the trigger rod 440 is arranged horizontally. When the lever 430 rotates vertically, the lower end of the lever 430 will drive the trigger rod 440 to move horizontally, which will cause the first contact part 441 to abut against the first micro switch 410, or cause the second contact part 442 to abut against the second micro switch 420. The horizontal movement direction of the trigger rod 440 is related to the rotation direction of the lever 430. Therefore, rotating the lever 430 in different directions can drive the trigger rod 440 to move in different directions, thereby triggering the first micro switch 410 or the second micro switch 420.

[0036] Furthermore, the trigger rod 440 is provided with a limiting groove arranged along its length. The two side walls of the limiting groove form an inclined first abutment portion 441 and an inclined second abutment portion 442, respectively. The ends of the first micro switch 410 and the second micro switch 420 are both located in the limiting groove. When the trigger rod 440 moves along its length, the first abutment portion can abut against the inclined surface of the end of the first micro switch 410 or the abutment portion can abut against the inclined surface of the end of the second micro switch 420. Of course, the first micro switch 410 and the second micro switch 420 are also arranged at intervals along the length of the trigger rod 440. The first micro switch 410 is closer to the first abutment portion 441, and the second micro switch 420 is closer to the second abutment portion 442. When the trigger rod 440 moves in different directions, it can trigger the first micro switch 410 or the second micro switch 420.

[0037] In this embodiment, the first direction is clockwise and the second direction is counterclockwise. The first contact part 441 is located on the side of the limiting groove near the lever 430. When the lever 430 rotates clockwise, taking the trigger lever 440 horizontally located to the left of the lever 430 as an example, its lower end can drive the trigger lever 440 to move horizontally to the left. This causes the first contact part 441 to move closer to the first micro switch 410 and the second contact part 442 to move away from the second micro switch 420. Therefore, when the lever 430 rotates clockwise... When the clock hand rotates, only the first contact part 441 will contact the first micro switch 410. When the lever 430 rotates counterclockwise, its lower end can drive the lever 430 to move horizontally to the right. The first contact part 441 will move away from the first micro switch 410, and the second contact part 442 will move closer to the second micro switch 420, thereby ensuring that only the second contact part 442 will contact the second micro switch 420, thus ensuring the unidirectional movement of the lifting cylinder 100.

[0038] Furthermore, the solenoid valve 300 is provided with a first outlet and a second outlet. The first outlet is connected to the rodless chamber of the lifting cylinder 100, and the second outlet is connected to the rod chamber of the lifting cylinder 100. At least two electromagnets are provided on the solenoid valve 300. When the first electromagnet is energized, the oil inlet of the solenoid valve 300 is connected to the first outlet. When the second electromagnet is energized, the oil inlet of the solenoid valve 300 is connected to the second outlet. Therefore, when the first micro switch 410 is triggered, the signal is fed back to the control system of the forklift. The control system controls the first electromagnet to be energized, and the oil inlet of the solenoid valve 300 is connected to the first outlet. When the second micro switch 420 is triggered, the signal is also fed back to the control system of the forklift. The control system controls the second electromagnet to be energized, and the oil inlet of the solenoid valve 300 is connected to the second outlet, thereby realizing the switching control of the oil circuit.

[0039] Specifically, the height control module includes an encoder 500 and a control unit. The encoder 500 is fixed on the mast 800 and is used to monitor the height of the forks 700. The control unit is electrically connected to both the lifting cylinder 100 and the encoder 500. When the encoder 500 detects that the forks 700 have risen to a first preset height or fallen to a second preset height, the encoder 500 transmits a signal to the control unit. The control unit can then send a control signal to the lifting cylinder 100 to stop its movement, i.e., stop it from continuing to rise or fall, to avoid interference between the forks 700 and external objects caused by continued rising or falling.

[0040] Furthermore, the height control module also includes an operation screen, which is electrically connected to the control unit and used to set a first preset height and a second preset height. That is, the first preset height and the second preset height are adjustable and can be adjusted according to actual needs to meet the needs of different scenarios.

[0041] Furthermore, in this embodiment, the lifting control system also includes an emergency stop module, which includes an emergency stop switch 600. The emergency stop switch 600 is electrically connected to the lifting cylinder 100 and is used to control the lifting cylinder 100 to stop moving. That is, in the event of an emergency, the lifting cylinder 100 can be controlled to stop its movement by the emergency stop switch 600, thereby improving the safety performance of the lifting of the forks 700.

[0042] In this embodiment, a fork lifting control system is disclosed, including a power module and a state control module. The power module includes a lifting cylinder 100 for driving the forks 700 to lift. The state control module includes a multi-way valve 200, a solenoid valve 300, and a micro-motion control unit 400. The oil inlet of the multi-way valve 200 is connected to an oil tank, and one oil outlet of the multi-way valve 200 can be connected to the rod-side or rodless side of the lifting cylinder 100 through the solenoid valve 300. The micro-motion control unit 400 includes a first micro switch 410, a second micro switch 420, and a lever 430. The first micro switch 410 and the second micro switch 420 are connected to each other. Both lever 420 and solenoid valve 300 are electrically connected. When lever 430 rotates in the first direction, it can trigger the first micro switch 410, so that one oil outlet of multi-way valve 200 is connected to the rodless chamber of lifting cylinder 100 through solenoid valve 300. When lever 430 rotates in the second direction, it can trigger the second micro switch 420, so that one oil outlet of multi-way valve 200 is connected to the rod chamber of lifting cylinder 100 through solenoid valve 300. By moving lever 430, the lifting cylinder 100 can be controlled in both rising and falling states, avoiding accidents caused by misoperation and improving safety performance.

[0043] The technical solution of this utility model has been described in detail above with reference to the accompanying drawings. The described embodiments are used to help understand the concept of this utility model. The specific embodiments described herein are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0044] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0045] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A forklift lifting control system, characterized in that, include: The power module includes a lifting cylinder, the piston rod of which is connected to the forks; The status control module includes a multi-way valve, a solenoid valve, and a micro-motion control unit. The oil inlet of the multi-way valve is connected to the oil tank, and one oil outlet of the multi-way valve can be connected to the rod-side or rodless side of the lifting cylinder through the solenoid valve. The micro-motion control unit includes a first micro-switch, a second micro-switch, and a lever. Both the first micro-switch and the second micro-switch are electrically connected to the solenoid valve. The lever can be rotated in a first direction to trigger the first micro switch, so that one oil outlet of the multi-way valve is connected to the rodless chamber of the lifting cylinder through the solenoid valve; The lever can be rotated in the second direction to trigger the second micro switch, so that one oil outlet of the multi-way valve is connected to the rod chamber of the lifting cylinder through the solenoid valve.

2. The fork lifting control system according to claim 1, characterized in that, The micro-motion control unit also includes a trigger rod and a mounting base. The lower end of the lever is rotatably mounted on the mounting base via a rotating shaft. One end of the trigger rod is connected to the lower end of the lever, and the trigger rod is provided with a first contact portion and a second contact portion arranged at intervals along its length. When the lever rotates in the first direction, the first contact part abuts against the first micro switch; when the lever rotates in the second direction, the second contact part abuts against the second micro switch.

3. A fork lifting control system according to claim 2, characterized in that, The trigger rod is provided with a limiting groove arranged along its length. The two side walls of the limiting groove are respectively formed by an inclined first abutment and an inclined second abutment. The ends of the first micro switch and the second micro switch are both located in the limiting groove. When the trigger rod moves along its length, the first abutment can abut against the inclined surface of the end of the first micro switch or the second abutment can abut against the inclined surface of the end of the second micro switch.

4. A fork lifting control system according to claim 3, characterized in that, The first direction is clockwise, the second direction is counterclockwise, and the first contact part is located on the side of the limiting groove near the lever.

5. A fork lifting control system according to claim 1, characterized in that, The solenoid valve is provided with a first outlet and a second outlet. The first outlet is connected to the rodless chamber of the lifting cylinder, and the second outlet is connected to the rod chamber of the lifting cylinder. When the first micro switch is triggered, the oil inlet of the solenoid valve is connected to the first outlet. When the second micro switch is triggered, the oil inlet of the solenoid valve is connected to the second outlet.

6. A fork lifting control system according to claim 1, characterized in that, The forks are mounted on the mast in a height-adjustable manner. The mast is mounted on the front side of the frame. The power module and the status control module are both mounted on the frame.

7. A fork lifting control system according to claim 6, characterized in that, It also includes a height control module, which includes an encoder fixed to the mast and used to monitor the height of the forks.

8. A fork lifting control system according to claim 7, characterized in that, The height control module also includes a control unit, which is electrically connected to both the lifting cylinder and the encoder. When the forks rise to a first preset height or fall to a second preset height, the control unit can control the lifting cylinder to stop operating.

9. A fork lifting control system according to claim 8, characterized in that, The height control module also includes an operation screen, which is electrically connected to the control unit and is used to set the first preset height and the second preset height.

10. A fork lifting control system according to claim 1, characterized in that, It also includes an emergency stop module, which includes an emergency stop switch. The emergency stop switch is electrically connected to the lifting cylinder and is used to control the lifting cylinder to stop moving.

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