A mast control method and system for a forklift

Abstract

The present invention discloses a mast control method and system for a forklift, including a first control switch for controlling the mast to tilt forward, a second control switch for controlling the mast to rise, and a multi-way valve for conducting the first control switch / the second control switch and the mast. The multi-way valve has a first connection end, a second connection end and a third connection end. The first connection end is connected to the first control switch, the second connection end is connected to the second control switch, and the third connection end is connected to the mast. A first preset value and a second preset value are set. When the load pressure of the mast exceeds the first preset value, the first connection end and the third connection end are disconnected. When the load pressure of the mast exceeds the second preset value, the second connection end and the third connection end are disconnected, thereby avoiding the problems of excessive forward tilt / side shift of the forklift and resulting in forward rollover and side rollover when the mast load is too large.

Description

Technical Field

[0001] The present invention relates to the technical field of forklifts, and particularly to a mast control method and system for a forklift. Background Art

[0002] A forklift is a commonly used cargo transportation tool. Among them, the cargo is lifted by a forklift arm, and the forklift arm is fixedly installed on a mast. The mast drives the forklift arm to lift, side-shift, forward-tilt, and backward-tilt, so as to adjust the angle and position of the cargo, and further realize the picking of the cargo at different positions and angles.

[0003] However, the existing forklifts have the following defects: The forklift arm is at the front end of the forklift. When the cargo is heavy, the overall center of gravity of the forklift moves forward. If the mast is lifted, forward-tilted, or laterally shifted at this time, it is easy to cause the whole vehicle to tip forward or laterally. Summary of the Invention

[0004] Aiming at the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a mast control method and system for a forklift, which is used to solve the problems such as easy tipping of the forklift when the load of the mast is large in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is a mast control method for a forklift, including a first control switch for controlling the forward-tilt of the mast, a second control switch for controlling the rise of the mast, and a multi-way valve for conducting the first control switch / second control switch and the mast. The multi-way valve has a first connection end, a second connection end, and a third connection end. The first connection end is connected to the first control switch, the second connection end is connected to the second control switch, and the third connection end is connected to the mast, including the steps of:

[0006] S1. Obtain the current load pressure P of the mast;

[0007] S2. Compare the size of the current load pressure P with a first preset value P1; if P < P1, then conduct the first connection end and the third connection end; if P > P1 or P = P1, then disconnect the first connection end and the third connection end, and enter the next step;

[0008] S3. Determine whether the mast is in a backward-tilt state / vertical state or a forward-tilt state; if the mast is in a vertical state or a backward-tilt state, then conduct the second connection end and the third connection end; if the mast is in a forward-tilt state, then disconnect the second connection end and the third connection end.

[0009] Further, it further includes a third control switch for controlling the side-shift of the mast, and the multi-way valve further has a fourth connection end, and the fourth connection end is connected to the third control switch;

[0010] In S2, it further includes the steps of:

[0011] S21. Compare the current load pressure P with the second preset value P2. If P < P2, then conduct the fourth connection end and the third connection end. If P > P2 or P = P2, then disconnect the fourth connection end and the third connection end.

[0012] Further, the first preset value P1 is 4.5 mpa, and the second preset value P2 is 13 mpa.

[0013] Further, it further includes a contact switch and a trigger for triggering the contact switch. The contact switch is arranged on the forklift frame, and the trigger is arranged on the mast.

[0014] When the mast is in the vertical state, the trigger contacts the contact switch, and when the mast tilts forward, the trigger separates from the contact switch.

[0015] Further, it further includes a fourth control switch for controlling the mast to tilt backward and a fifth control switch for controlling the mast to lower. The fourth control switch and the fifth control switch are always conducted with the mast.

[0016] Further, a mast control system for a forklift is also disclosed, including a first control switch for controlling the mast to tilt forward, a second control switch for controlling the mast to rise, and a multi-way valve for conducting the first control switch / the second control switch and the mast. The multi-way valve has a first connection end, a second connection end, and a third connection end. The first connection end is connected to the first control switch, the second connection end is connected to the second control switch, and the third connection end is connected to the mast, including:

[0017] A detection module for obtaining the current load pressure P of the mast;

[0018] A first determination module for comparing the current load pressure P with the first preset value P1. If P < P1, then conduct the first connection end and the third connection end. If P > P1 or P = P1, then disconnect the first connection end and the third connection end;

[0019] A second determination module for determining whether the mast is in the tilted-back state / the vertical state or the tilted-forward state when P > P1 or P = P1. If the mast is in the vertical state or the tilted-back state, then conduct the second connection end and the third connection end. If the mast is in the tilted-forward state, then disconnect the second connection end and the third connection end.

[0020] Further, it further includes a third control switch for controlling the mast to shift laterally. The multi-way valve further has a fourth connection end, and the fourth connection end is connected to the third control switch;

[0021] In the first determination module, a determination unit is further included: used to compare the size of the current load pressure P with the second preset value P2; if P < P2, the fourth connection end and the third connection end are conducted; if P > P2 or P = P2, the fourth connection end and the third connection end are disconnected.

[0022] Further, the first preset value P1 is 4.5 mpa, and the second preset value P2 is 13 mpa.

[0023] Further, a contact switch and a trigger for triggering the contact switch are further included; the contact switch is arranged on the forklift frame, and the trigger is arranged on the mast;

[0024] When the mast is in the vertical state, the trigger contacts the contact switch, and when the mast tilts forward, the trigger separates from the contact switch.

[0025] Further, a fourth control switch for controlling the mast to tilt backward and a fifth control switch for controlling the mast to lower are further included, and the fourth control switch and the fifth control switch are always conducted with the mast.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] The first preset value and the second preset value are set. When the load pressure of the mast exceeds the first preset value, the first connection end and the third connection end are disconnected. When the load pressure of the mast exceeds the second preset value, the second connection end and the third connection end are disconnected, thereby avoiding the problems of excessive forward tilt / side shift of the forklift and resulting in forward rollover and side rollover when the mast load is too large. Description of the Drawings

[0028] Figure 1 It is a flowchart of the mast control method in the embodiment; Detailed Embodiments

[0029] The following are specific embodiments of the present invention in combination with the drawings, and the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0030] Please refer to Figure 1 , the present invention discloses a mast control method for a forklift, including a first control switch for controlling the mast to tilt forward, a second control switch for controlling the mast to rise, and a multi-way valve for conducting the first control switch / second control switch and the mast. The multi-way valve has a first connection end, a second connection end, and a third connection end. The first connection end is connected to the first control switch, the second connection end is connected to the second control switch, and the third connection end is connected to the mast, including the steps:

[0031] S1. Obtain the current load pressure P of the mast.

[0032] S2. Compare the size of the current load pressure P with the first preset value P1; if P < P1, then conduct the first connection end and the third connection end; if P > P1 or P = P1, then disconnect the first connection end and the third connection end, and proceed to the next step.

[0033] S3. Determine whether the mast is in the backward tilt state / vertical state or forward tilt state; if the mast is in the vertical state or backward tilt state, then conduct the second connection end and the third connection end; if the mast is in the forward tilt state, then disconnect the second connection end and the third connection end.

[0034] Specifically, in this application, first, a pressure sensor is used to detect the load pressure P of the mast to reflect the load weight of the mast, and then the load pressure is compared with the first preset value. If the load pressure is less than the first preset value, then the first connection end and the third connection end are conducted, so that the first control switch can control the forward tilt of the mast to adjust the goods to an appropriate angle and position; when the load pressure of the mast is greater than or equal to the first preset value at this time, it indicates that the load of the mast exceeds the safety value at this time, and it is necessary to disconnect the first connection end and the third connection end so that the first control switch cannot control the forward tilt of the mast to avoid the center of gravity of the forklift being too far forward and causing the forklift to tip forward. In this way, it is possible to prevent the dangerous accident of the forklift tipping forward caused by the center of gravity moving forward too much due to the excessive load of the forklift while the mast is tilting forward.

[0035] When P > P1 or P = P1, it is also necessary to judge the current tilt state of the mast. If it is in the forward tilt state at this time, it is necessary to disconnect the second connection end and the third connection end to prevent the center of gravity of the forklift from moving forward due to the rising of the mast and causing a forward roll; if the forklift is in the backward tilt state or vertical state at this time, then conduct the second connection end and the third connection end so that the mast can drive the forklift arm to rise a certain height.

[0036] It should be noted that there is an oil cylinder on the mast for driving its forward tilt and rising, and the third connection end is conducted with the oil cylinder, so that the conduction of different ports of the multi-way valve can realize the control of the mast by the first control switch / second control switch.

[0037] Furthermore, it further includes a third control switch for controlling the side shift of the mast, the multi-way valve further has a fourth connection end, and the fourth connection end is connected to the third control switch;

[0038] In S2, it further includes the steps:

[0039] S21. Compare the size of the current load pressure P with the second preset value P2; if P < P2, then conduct the fourth connection end and the third connection end; if P > P2 or P = P2, then disconnect the fourth connection end and the third connection end.

[0040] Specifically, when the load pressure is greater than the second preset value, it indicates that the load on the mast at this time exceeds the safety value. Therefore, it is necessary to disconnect the fourth connection end and the third connection end, so that the third control switch cannot control the lateral movement of the mast, to avoid the risk of the forklift tipping over due to the center of gravity of the forklift shifting to both sides.

[0041] Further, the first preset value P1 is 4.5 mpa, and the second preset value P2 is 13 mpa.

[0042] Specifically, when the forklift is not offset, the maximum load weight is 1000 kg, and the corresponding load pressure is 15 mpa; when the forklift is offset, the maximum load weight is 800 kg, and the corresponding load pressure is 13 mpa. Therefore, the second preset value of this application is set to 13 mpa.

[0043] Further, it further includes a contact switch and a trigger for triggering the contact switch; the contact switch is arranged on the forklift frame, and the trigger is arranged on the mast;

[0044] When the mast is in the vertical state, the trigger contacts the contact switch, and when the mast tilts forward, the trigger is separated from the contact switch.

[0045] Specifically, a contact switch is installed on the forklift frame, and a trigger is installed on the mast. When the mast is in the vertical state, the trigger just contacts the contact switch, and the contact switch sends a signal, thereby determining that the mast is in the vertical state or the rearward tilt state at this time; when the mast tilts forward from the vertical state, the mast drives the trigger to move forward, so that the trigger is separated from the contact switch, and the contact switch stops sending signals, and it is judged that the mast is in the forward tilt state; when the mast tilts backward from the vertical state, the mast drives the trigger to move backward, and the trigger always remains in contact with the trigger switch without interrupting the signal.

[0046] Further, it further includes a fourth control switch for controlling the rearward tilt of the mast, and a fifth control switch for controlling the lowering of the mast. The fourth control switch and the fifth control switch are always conducted with the mast.

[0047] Specifically, the fifth control switch for controlling the lowering of the mast and the fourth control switch for controlling the rearward tilt in this application are always conducted with the mast, so that the mast can be adjusted to lower and rearward tilt at any time. When the forklift is about to tip over forward, the operator can quickly control the rearward tilt and lowering of the mast to remedy the posture of the forklift and prevent it from tipping over forward.

[0048] It should be noted that the fact that the fourth control switch and the fifth control switch are conducted with the mast as recorded here means that the fourth control switch / fifth control switch is conducted with the oil cylinder on the mast for driving its lowering or rearward tilt.

[0049] Further, a mast control system for a forklift is also disclosed, including a first control switch for controlling the forward tilt of the mast, a second control switch for controlling the rise of the mast, and a multi-way valve for conducting the first control switch / the second control switch and the mast. The multi-way valve has a first connection end, a second connection end, and a third connection end. The first connection end is connected to the first control switch, the second connection end is connected to the second control switch, and the third connection end is connected to the mast, including:

[0050] A detection module for obtaining the current load pressure P of the mast;

[0051] A first determination module for comparing the magnitude of the current load pressure P with a first preset value P1; if P < P1, then conduct the first connection end and the third connection end; if P > P1 or P = P1, then disconnect the first connection end and the third connection end;

[0052] A second determination module for determining whether the mast is in a rearward tilt state / a vertical state or a forward tilt state when P > P1 or P = P1; if the mast is in a vertical state or a rearward tilt state, then conduct the second connection end and the third connection end; if the mast is in a forward tilt state, then disconnect the second connection end and the third connection end.

[0053] Further, it also includes a third control switch for controlling the side shift of the mast. The multi-way valve also has a fourth connection end, and the fourth connection end is connected to the third control switch;

[0054] In the first determination module, there is also a determination unit: for comparing the magnitude of the current load pressure P with a second preset value P2; if P < P2, then conduct the fourth connection end and the third connection end; if P > P2 or P = P2, then disconnect the fourth connection end and the third connection end.

[0055] Further, the first preset value P1 is 4.5 mpa, and the second preset value P2 is 13 mpa.

[0056] Further, it also includes a contact switch and a trigger for triggering the contact switch; the contact switch is arranged on the vehicle frame of the forklift, and the trigger is arranged on the mast;

[0057] When the mast is in a vertical state, the trigger contacts the contact switch, and when the mast tilts forward, the trigger separates from the contact switch.

[0058] Further, it also includes a fourth control switch for controlling the rearward tilt of the mast, and a fifth control switch for controlling the descent of the mast. The fourth control switch and the fifth control switch are always conducted with the mast.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0060] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and defined, the terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A mast control method for a forklift, comprising a first control switch for controlling the forward tilt of the mast, a second control switch for controlling the raising of the mast, and a multi-way valve for conducting the first control switch, the second control switch and the mast. The multi-way valve has a first connection end, a second connection end and a third connection end. The first connection end is connected to the first control switch, the second connection end is connected to the second control switch, and the third connection end is connected to the mast, characterized in that, Including steps: S1. Obtain the current load pressure P of the mast; S2. Compare the size of the current load pressure P with the first preset value P1; if P < P1, then conduct the first connection end and the third connection end; if P > P1 or P = P1, then disconnect the first connection end and the third connection end, and proceed to the next step; S3. Determine whether the mast is in the backward tilt state, vertical state or forward tilt state; if the mast is in the vertical state or backward tilt state, then conduct the second connection end and the third connection end; if the mast is in the forward tilt state, then disconnect the second connection end and the third connection end.

2. The gantry control method for a forklift according to claim 1, wherein, It further includes a third control switch for controlling the side shift of the mast. The multi-way valve further has a fourth connection end, and the fourth connection end is connected to the third control switch; In S2, it further includes steps: S21. Compare the size of the current load pressure P with the second preset value P2; if P < P2, then conduct the fourth connection end and the third connection end; if P > P2 or P = P2, then disconnect the fourth connection end and the third connection end.

3. A mast control method for a forklift according to claim 2, characterized in that, The first preset value P1 is 4.5 mpa, and the second preset value P2 is 13 mpa.

4. A mast control method for a forklift according to claim 1, characterized in that, It further includes a contact switch and a trigger for triggering the contact switch; the contact switch is arranged on the forklift frame, and the trigger is arranged on the mast; When the mast is in the vertical state, the trigger contacts the contact switch, and when the mast tilts forward, the trigger separates from the contact switch.

5. A mast control method for a forklift according to claim 1, characterized in that, It further includes a fourth control switch for controlling the backward tilt of the mast and a fifth control switch for controlling the lowering of the mast. The fourth control switch and the fifth control switch are always conducted with the mast.

6. A mast control system for a forklift, comprising a first control switch for controlling the forward tilt of the mast, a second control switch for controlling the raising of the mast, and a multi-way valve for conducting the first control switch, the second control switch and the mast. The multi-way valve has a first connection end, a second connection end and a third connection end. The first connection end is connected to the first control switch, the second connection end is connected to the second control switch, and the third connection end is connected to the mast. It is characterized in that, Including: A detection module for obtaining the current load pressure P of the mast; A first determination module for comparing the size of the current load pressure P with the first preset value P1; if P < P1, then conduct the first connection end and the third connection end; if P > P1 or P = P1, then disconnect the first connection end and the third connection end; A second determination module for determining whether the mast is in the backward tilt state, vertical state or forward tilt state when P > P1 or P = P1; If the mast is in the vertical state or backward tilt state, then conduct the second connection end and the third connection end; if the mast is in the forward tilt state, then disconnect the second connection end and the third connection end.

7. The mast control system for a forklift according to claim 6, characterized in that, It further includes a third control switch for controlling the side shift of the mast. The multi-way valve further has a fourth connection end, and the fourth connection end is connected to the third control switch; In the first determination module, it further includes a determination unit for comparing the size of the current load pressure P with the second preset value P2; If P < P2, then conduct the fourth connection end and the third connection end; if P > P2 or P = P2, then disconnect the fourth connection end and the third connection end.

8. A mast control system for a forklift according to claim 7, characterized in that, The first preset value P1 is 4.5 mpa, and the second preset value P2 is 13 mpa.

9. The mast control system for a forklift according to claim 6, characterized in that, It further includes a contact switch and a trigger for triggering the contact switch; the contact switch is arranged on the forklift frame, and the trigger is arranged on the mast; When the mast is in the vertical state, the trigger contacts the contact switch, and when the mast tilts forward, the trigger separates from the contact switch.

10. A mast control system for a forklift according to claim 6, characterized in that, It further includes a fourth control switch for controlling the backward tilt of the gantry and a fifth control switch for controlling the lowering of the gantry, and the fourth control switch and the fifth control switch are always electrically connected to the gantry.

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