A control method for anti-overload container double-arm forklift

Abstract

The present application provides a control method for an anti-overload container double-arm forklift, the forklift comprising: a frame, a portion of the frame close to the rear of the forklift having a supporting tilting portion, a slide groove being provided on the frame, and an adapter frame being slidably installed in the slide groove; the forklift further comprising: a lifting assembly, the lifting assembly comprising: a telescopic lifting arm, a fixed end of the telescopic lifting arm being hinged to the top of the supporting tilting portion, a fork frame assembly being fixedly installed at the telescopic end, a pair of the telescopic lifting arms being provided, and being symmetrically installed on both sides of a cab of the forklift respectively; a first cylinder assembly, a cylinder end of the first cylinder assembly being hinged to the middle of the supporting tilting portion, and a telescopic end being hinged to the bottom of the telescopic lifting arm.

Description

Technical Field

[0001] The present application relates to the technical field of container forklifts, and in particular to a control method for an anti-overload container double-arm forklift. Background Art

[0002] In the existing container forklift, the connection between the fork frame assembly and the forklift body is located at the front end of the forklift, which causes the overall center of gravity of the forklift to be biased toward the front end of the forklift when transporting goods. When facing overweight goods, the forklift may tip forward, causing accidents.

[0003] However, although the cab-lift telescopic forklift with publication number CN215402877U solves the problem of center of gravity deviation, the support point position of the fourth cylinder causes an angle between the supporting force of the fourth cylinder supporting the lifting arm and the lifting arm, resulting in the supporting force of the fourth cylinder not being fully exerted. When loading too heavy goods, the fourth cylinder is likely to bend, eventually causing an accident. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned problems and provide an anti-overload container double-arm forklift and control.

[0005] The technical solution of this application is implemented as follows:

[0006] In a first aspect, the present application provides an anti-overload container double-arm forklift, the forklift comprising: a frame, a portion of the frame close to the rear of the forklift having a supporting tilting portion, a slide groove being provided on the frame, and an adapter frame being slidably installed in the slide groove;

[0007] The forklift also includes:

[0008] A lifting assembly, the lifting assembly comprising:

[0009] A telescopic boom, wherein the fixed end of the telescopic boom is hinged to the top of the supporting tilting portion, and a fork frame assembly is fixedly mounted on the telescopic end. A pair of telescopic booms are provided and are symmetrically mounted on both sides of the cab of the forklift respectively;

[0010] A first oil cylinder assembly, wherein a cylinder end of the first oil cylinder assembly is hinged to the middle of the supporting tilting portion, and a telescopic end is hinged to the bottom of the telescopic lifting arm;

[0011] a second cylinder assembly, the second cylinder assembly being hinged between the adapter frame and the bottom of the telescopic boom;

[0012] The top of the supporting tilting portion is located above the rear wheel of the forklift;

[0013] The forklift further comprises: a driving assembly for driving the adapter frame to move in the slide slot, so that the forklift can switch between a normal state, an ultra-high operation state and an anti-overload state;

[0014] Under normal conditions, the adapter frame moves to a position where the slide slot is close to the rear of the forklift;

[0015] In the overload protection state or the super-high operation state, the adapter frame moves to a position close to the front of the forklift.

[0016] In a second aspect, the present application further provides a control method, wherein the forklift further comprises:

[0017] A controller, the controller is used to control the rotation of the motor so that the forklift is switched between a normal state, an ultra-high operation state and an anti-overload state;

[0018] The control method comprises:

[0019] S1, input actual load and carrying range;

[0020] S2, when the actual load and the carrying range meet the first standard load and the first standard carrying range respectively, controlling the forklift to enter a normal state and start working;

[0021] When the actual load and the carrying range meet the first standard load and the second standard carrying range respectively, the forklift is controlled to enter an ultra-high operation state and start working;

[0022] When the actual load and the carrying range meet the second standard load and the third standard carrying range respectively, the forklift is controlled to enter an anti-overload state and start working;

[0023] Among them, the first standard load is smaller than the second standard load; the first standard carrying range includes a minimum first standard height H1 and a maximum first standard height H2, the second standard carrying range includes a minimum second standard height H3 and a maximum second standard height H4, the third standard carrying range includes a minimum third standard height H5 and a maximum third standard height H6, wherein H4>H6>H2>H3>H5>H1.

[0024] The advantages or beneficial effects of the above technical solution include at least:

[0025] The controller and the forklift load sensor can sense in real time whether the actual load of the forklift exceeds the safety value. Before the actual load reaches the safety load, the controller switches the forklift from the normal state to the anti-overload state, changes the fulcrum of the second cylinder assembly, and makes the axial direction of the second cylinder assembly perpendicular to the telescopic boom to enter the anti-overload state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings illustrate exemplary implementations of the present application of embodiments of the present invention and, together with the description, are used to explain the principles of the present application. These drawings are included to provide a further understanding of the present application, and the drawings are included in and constitute a part of this specification.

[0027] Figure 1 A schematic diagram showing a normal state and an anti-overload state of a forklift according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram showing the positions of the lead screw and the motor according to an embodiment of the present invention is shown, wherein the enlarged diagram in the dotted circle in the lower half is a schematic diagram of the preset position;

[0029] Figure 3 A schematic diagram showing the position of the guide rail according to an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of a forklift in a normal state of an embodiment of the present invention is shown, when the fork frame assembly is lowered close to the ground;

[0031] Figure 5 A schematic diagram showing the displacement of the second oil cylinder assembly according to an embodiment of the present invention is shown;

[0032] Figure 6 A schematic diagram showing a normal state of a forklift according to an embodiment of the present invention;

[0033] Figure 7 A schematic diagram showing an ultra-high operation state of a forklift according to an embodiment of the present invention;

[0034] Figure 8 A schematic diagram showing an anti-overload state of a forklift according to an embodiment of the present invention;

[0035] Fig. 9 A schematic diagram of a forklift according to an embodiment of the present invention on a downhill section is shown, wherein the upper part shows the forklift in an overload prevention state;

[0036] Fig.10 A schematic diagram showing a third oil cylinder and a fourth oil cylinder according to an embodiment of the present invention is shown;

[0037] Fig.11 A schematic diagram showing the telescopic stroke of the third oil cylinder and the fourth oil cylinder of the embodiment of the present invention is shown;

[0038] Fig.12 A schematic diagram showing the connection of a controller, a forklift load sensing system, an audible and visual alarm, a position sensor, and a balance sensor according to an embodiment of the present invention is shown;

[0039] Fig.13A schematic diagram showing the proportional relationship of H4>H6>H2>H3>H5>H1 in an embodiment of the present invention is shown.

[0040] Figure numerals: 10, frame; 11, supporting tilting part; 12, slide groove; 121, adapter frame; 122, guide rail; 21, telescopic lifting arm; 211, fork frame assembly; 22, first cylinder assembly; 23, second cylinder assembly; 231, third cylinder; 232, fourth cylinder; 31, screw rod; 32, motor; 41, controller; 42, forklift load sensing system; 43, sound and light alarm; 44, position sensor; 45, balance sensor. DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0042] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] It should be understood that the term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0044] It should be noted that the modifications of "one" and "plurality" mentioned in the present application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0045] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0046] Reference Figure 1An anti-overload container double-arm forklift, the forklift comprises: a frame 10, a portion of the frame 10 near the rear of the forklift has a supporting tilting portion 11, a slide groove 12 is provided on the frame 10, and an adapter frame 121 is slidably installed in the slide groove 12;

[0047] The forklift also includes:

[0048] Lifting assembly, the lifting assembly comprises:

[0049] A telescopic boom 21, the fixed end of which is hinged to the top of the supporting tilting part 11, and a fork frame assembly 211 is fixedly installed at the telescopic end. A pair of telescopic booms 21 are provided, and are symmetrically installed on both sides of the forklift cab respectively; a first cylinder assembly 22, the cylinder end of the first cylinder assembly 22 is hinged to the middle of the supporting tilting part 11, and the telescopic end is hinged to the bottom of the telescopic boom 21; a second cylinder assembly 23, the cylinder end of the second cylinder assembly 23 is hinged to the adapter frame 121, and the telescopic end is hinged to the bottom of the telescopic boom 21;

[0050] The top of the supporting tilting portion 11 is located above the rear wheel of the forklift to increase the height of the tail of the telescopic boom 21, so that the fork frame assembly 211 can be lowered close to the ground when the forklift is in a non-working state;

[0051] The forklift further includes: a driving assembly for driving the adapter frame 121 to move in the slide slot 12 so that the forklift can switch between the normal state, the super-high operation state and the anti-overload state; the driving assembly includes: a screw rod 31, which is rotatably installed in the slide slot 12, and the adapter frame 121 is threadedly matched with the screw rod 31; a motor 32 is installed at a preset position for rotating the screw rod 31; the preset position is the part of the frame 10 close to the forklift head and at the end of the slide slot 12, such as Figure 2 As shown, this position distance enables the motor 32 to be located at the side of the screw rod 31 away from the motor 32 in a normal state.

[0052] In summary, when it is necessary to enter the anti-overload state or the ultra-high operation state from the normal state, the motor 32 needs to be rotated to rotate the screw rod 31, thereby driving the adapter frame 121 to move. The position of the cylinder end of the second cylinder assembly 23 can be changed by moving the adapter frame 121. At this time, when the motor 32 rotates the screw rod 31, the force arm of the rotating screw rod 31 is the longest, so that the motor 32 can rotate the screw rod 31 more easily to reduce the loss of the motor 32 and the power required to be consumed. At the same time, driving the adapter frame 121 effortlessly can make the state switching faster.

[0053] In summary, under normal conditions, the adapter frame 121 moves to a position where the slide slot 12 is close to the rear of the forklift. Figure 1 The upper part and Figure 4As shown, at this time, the cooperation between the first cylinder assembly 22 and the second cylinder assembly 23 can lower the fork frame assembly 211 of the forklift to close to the ground;

[0054] In the super-high operation state, the adapter frame 121 moves to the middle of the screw rod 31 so that the predetermined position is the position where the angle between the second cylinder assembly 23 and the frame 10 is 90°. Figure 7 As shown, at this time, the extension distance of the second cylinder assembly 23 is the maximum, and the telescopic boom 21 is raised to the highest position, so that the forklift can operate at a height that cannot be reached under normal conditions.

[0055] In the overload protection state, the adapter frame 121 moves to the extreme position of the screw rod 31 close to the front of the vehicle. Preferably, the adapter frame 121 moves to a position where the second cylinder assembly 23 is perpendicular to the telescopic boom 21. At this time, the axial direction of the second cylinder assembly 23 is perpendicular to the telescopic boom 21. At this time, the support position of the second cylinder assembly 23 is a position that can withstand the maximum load. However, in the overload protection state, the telescopic boom 21 cannot be lowered, so that the fork frame assembly 211 is lowered to a position close to the ground. If it is necessary to lower the fork frame assembly 211 to a position such as Figure 4 It is worth noting that the anti-overload state can also cope with the situation where the forklift is on a downhill section under the loading state to prevent accidents, such as Fig. 9 shown.

[0056] Based on the further improvement of the above structure, the frame 10 is provided with a guide rail 122 in the part inside the slide groove 12, and the extension direction of the guide rail 122 is consistent with the extension direction of the slide groove 12; the adapter frame 121 can be slidably embedded in the guide rail 122; there is a fixed gap between the bottom of the adapter frame 121 and the bottom of the slide groove 12, and the middle part of the adapter frame 121 fits with the top of the guide rail 122, so as to disperse the force transmitted from the telescopic boom 21 to the second cylinder assembly 23 to the top of the guide rail 122, and at the same time, the guide rail 122 can also prevent the adapter frame 121 from rubbing against the bottom of the slide groove 12, making its movement smoother.

[0057] Based on the further improvement of the above structure, such as Fig.10 As shown, the second oil cylinder assembly 23 includes a third oil cylinder 231 and a fourth oil cylinder 232 connected in series; the cylinder barrels of the third oil cylinder 231 and the fourth oil cylinder 232 are fixed to each other, and the telescopic ends of the two are telescopic in opposite directions, wherein the telescopic end of the third oil cylinder 231 is hinged to the adapter frame 121, and the telescopic end of the fourth oil cylinder 232 is hinged to the telescopic boom 21. The cylinder barrel lengths of the third oil cylinder 231 and the fourth oil cylinder 232 are consistent, and the head and tail are close together, and the telescopic end strokes of the third oil cylinder 231 and the fourth oil cylinder 232 are consistent. At the same time, the third oil cylinder 231 and the fourth oil cylinder 232 are of the same model:

[0058] Specifically, Fig.11 As shown, define:

[0059] The maximum telescopic stroke of the third oil cylinder 231 and the fourth oil cylinder 232 is S1;

[0060] In the commonly used specifications of oil cylinders on the market, the standard ratio of the stroke of the oil cylinder to the cylinder length is about 60%, so the cylinder length size and stroke ratio of the third oil cylinder 231 and the fourth oil cylinder 232 is 3:2. Assuming that the cylinder length of the third oil cylinder 231 and the fourth oil cylinder 232 is S2, where S1=2 / 3S2;

[0061] Therefore, in order to make the upward swing angle of the telescopic boom 21 larger, it is necessary to make the telescopic ends of the third oil cylinder 231 and the fourth oil cylinder 232 extend to the longest, that is, the support length L of the third oil cylinder 231 and the fourth oil cylinder 232 is L=S2+2S1;

[0062] In order to minimize the downward swing angle of the telescopic boom 21 , the telescopic ends of the third cylinder 231 and the fourth cylinder 232 need to be retracted to the minimum, that is, the supporting length L′ of the third cylinder 231 and the fourth cylinder 232 is S2 .

[0063] It can be seen from the above that the bidirectional setting of the third oil cylinder 231 and the fourth oil cylinder 232 can greatly increase the support amount for the telescopic boom 21, and at the same time can also meet the downward swing of the telescopic boom 21 in the anti-overload state, ensuring that the fork assembly 211 can be close to the ground. In order to achieve precise control of the speed and thrust of the third oil cylinder 231 and the fourth oil cylinder 232, a hydraulic control valve (such as a throttle valve, a reversing valve, a relief valve, etc.) can be used to accurately control the flow direction and pressure of the hydraulic oil; or an electronic control system, such as a proportional servo valve, can adjust the speed and position of the cylinder according to the real-time feedback signal; or a synchronous control loop (such as a series synchronous loop, a diverter valve synchronous loop, etc.) can be used to ensure the action of the two cylinders; or feedback devices such as displacement sensors and pressure sensors can monitor the position and load of the cylinder in real time, and adjust them through the control system to ensure precise synchronous control. These are all control means in this field and will not be described in detail in this case.

[0064] It can be concluded from the above description that when the third cylinder 231 and the fourth cylinder 232 are used, the extension amount can be further improved compared to the first, second and third embodiments using a single second cylinder assembly 23, and at the same time, the retraction amount can also be increased; for example, the cylinder length of the third cylinder 231 and the fourth cylinder 232 is between 0.6 meters and 1.2 meters, which can make the telescopic distance of the second cylinder assembly 23 reach 0.8 meters to 1.6 meters.

[0065] An embodiment of the present invention further provides a control method based on the above-mentioned anti-overload container double-arm forklift, and the forklift further comprises:

[0066] The controller 41 is used to control the rotation of the motor 32 so that the forklift can be switched between the normal state, the super-high operation state and the anti-overload state. In addition, it also has the function of inputting a predetermined load and a predetermined operation height of the forklift. The controller 41 is further used to: when the adapter frame 121 moves, control the telescopic end of the second cylinder assembly 23 to contract or extend to maintain the height of the fork frame assembly 211;

[0067] The forklift further comprises:

[0068] A forklift load sensing system 42, used for monitoring the actual load of the forklift, wherein the forklift load sensing system 42 is electrically connected to the controller 41 to send the actual load to the controller 41;

[0069] A balance sensor 45, used to detect the angle formed between the rear end of the forklift and the horizontal line of the ground, and the balance sensor 45 is electrically connected to the controller 41 to send the angle to the controller 41;

[0070] An audible and visual alarm 43, used to remind the forklift driver that the forklift is in an overloaded state, and the audible and visual alarm is electrically connected to the controller 41;

[0071] The position sensor 44 is arranged in the middle of the screw rod 31 and corresponds to the position where the second cylinder assembly 23 is hinged to the telescopic boom 21, and is used to sense the position of the adapter frame 121 on the screw rod 31. Specifically, when the forklift is in the super-high operation state, the adapter frame 121 is in a predetermined position; the predetermined position is the position of the adapter frame 121 on the screw rod 31 when the angle between the first cylinder assembly 22 and the frame 10 is 90°. When the adapter frame 121 moves to the predetermined position, the position sensor 44 sends a signal to the controller 41, such as Figure 7 shown.

[0072] Control methods include:

[0073] When the actual load and the carrying range meet the first standard load and the first standard carrying range respectively, the forklift is controlled to enter the normal state and start working; or when the actual load and the carrying range meet the first standard load and the second standard carrying range respectively, the forklift is controlled to enter the super-high operation state and start working; or when the actual load and the carrying range meet the second standard load and the first standard carrying range respectively, the forklift is controlled to enter the anti-overload state and start working; or when the angle formed between the rear of the forklift and the horizontal line of the ground, and the forklift load sensing system 42 detects that the forklift is in the loading state, the forklift is controlled to enter the anti-overload state and start working, and at the same time the controller 41 sends a signal to the sound and light alarm 43, and the sound and light alarm 43 sends a sound and light reminder according to the signal;

[0074] When the forklift touches the position sensor 44 during the process of controlling the forklift to enter the super-high operation state, it is determined that the forklift has reached the designated position and entered the super-high operation state.

[0075] The control method comprises the following specific steps:

[0076] S1, input actual load and carrying range;

[0077] S2, when the actual load and the carrying range meet the first standard load and the first standard carrying range respectively, controlling the forklift to enter a normal state and start working;

[0078] When the actual load and the carrying range meet the first standard load and the second standard carrying range respectively, the forklift is controlled to enter an ultra-high operation state and start working;

[0079] When the actual load and the carrying range meet the second standard load and the third standard carrying range respectively, the forklift is controlled to enter an anti-overload state and start working;

[0080] Among them, the first standard load is smaller than the second standard load; the first standard carrying range includes a minimum first standard height H1 and a maximum first standard height H2, the second standard carrying range includes a minimum second standard height H3 and a maximum second standard height H4, the third standard carrying range includes a minimum third standard height H5 and a maximum third standard height H6, wherein H4>H6>H2>H3>H5>H1.

[0081] At the same time, when the forklift encounters a downhill section and is loading, the controller detects that an angle is formed between the rear of the forklift and the horizontal line of the ground, and the controller controls the forklift to enter the anti-overload mode to operate to avoid the danger of the vehicle tipping forward. At the same time, the sound and light alarm 43 sounds an alarm to remind the driver that the vehicle may be overloaded. Fig. 9 shown.

[0082] Specifically, as shown in Table 1:

[0083] Table 1:

[0084]

[0085] The controller will switch the state of the forklift according to four different situations. During this period, the controller 41 will adjust the position of the second cylinder assembly 23 in real time according to the data transmitted by each sensor to ensure the safety of the operation.

[0086] Based on the above control method, further, in step S2, the process of controlling the forklift to enter the super-high operation state and start working specifically includes:

[0087] S21, driving the second cylinder assembly 23 to drive the forklift so that the fork frame assembly 211 reaches at least the minimum second standard height H3;

[0088] S22, in the process of controlling the driving assembly to drive the adapter frame 121 to move toward the position of the position sensor 44, the telescopic end of the second cylinder assembly 23 is controlled to retract so that the fork frame assembly 211 maintains the height.

[0089] And, in step S2, the process of controlling the forklift to enter the anti-overload state and start working specifically includes:

[0090] S21, driving the second cylinder assembly 23 to drive the forklift so that the fork frame assembly 211 reaches at least the minimum second standard height H3;

[0091] S22, in the process of controlling the driving assembly to drive the adapter frame 121 to move to the predetermined position, the telescopic end of the second cylinder assembly 23 is simultaneously controlled to retract, so that the height of the fork frame assembly 211 is maintained;

[0092] S23, when the position sensor 44 is touched, the driving assembly is controlled to drive the adapter frame 121 to move to the extreme position of the screw rod 31 close to the front of the vehicle, and at the same time, the telescopic end of the second cylinder assembly 23 is controlled to extend so that the fork frame assembly 211 maintains its height.

[0093] This ensures that sufficient space is provided for the movement of the adapter frame 121, and prevents the base of the second cylinder assembly 23 from being unable to move due to the telescopic boom 21 being too low.

[0094] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0095] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present application, and are not intended to limit the scope of the present application. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present application.

Claims

1. A control method for an anti-overload container double-arm forklift, characterized in that: The forklift comprises: a frame (10), a portion of the frame (10) close to the rear of the forklift having a supporting raised portion (11), a slide groove (12) being provided on the frame (10), and an adapter frame (121) being slidably mounted in the slide groove (12); The forklift further comprises: a lifting assembly, the lifting assembly comprising: A telescopic boom (21), wherein a fixed end of the telescopic boom (21) is hinged to the top of the supporting tilting portion (11), a fork frame assembly (211) is fixedly mounted on the telescopic end, and a pair of telescopic booms (21) are provided and are symmetrically mounted on both sides of the forklift cabin; A first oil cylinder assembly (22), wherein a cylinder end of the first oil cylinder assembly (22) is hinged to the middle of the supporting tilting portion (11), and a telescopic end is hinged to the bottom of the telescopic lifting arm (21); a second oil cylinder assembly (23), the second oil cylinder assembly (23) being hinged between the adapter frame (121) and the bottom of the telescopic boom (21); A drive assembly, used for driving the adapter frame (121) to move in the slide slot (12), so that the forklift can switch between a normal state, an ultra-high operation state and an anti-overload state; In a normal state, the adapter frame (121) moves to a position where the slide slot (12) is close to the rear of the forklift; In an overload protection state or an ultra-high operation state, the adapter frame (121) moves to a position close to the front of the forklift; The control method comprises: S1, input actual load and carrying range; S2, when the actual load and the carrying range meet the first standard load and the first standard carrying range respectively, controlling the forklift to enter a normal state and start working; When the actual load and the carrying range meet the first standard load and the second standard carrying range respectively, the forklift is controlled to enter an ultra-high operation state and start working; When the actual load and the carrying range meet the second standard load and the third standard carrying range respectively, the forklift is controlled to enter an anti-overload state and start working; Among them, the first standard load is smaller than the second standard load; the first standard carrying range includes a minimum first standard height H1 and a maximum first standard height H2, the second standard carrying range includes a minimum second standard height H3 and a maximum second standard height H4, the third standard carrying range includes a minimum third standard height H5 and a maximum third standard height H6, wherein H4>H6>H2>H3>H5>H1.

2. The control method of the anti-overload container double-arm forklift according to claim 1 is characterized in that: The drive assembly comprises: A screw rod (31) is rotatably mounted in the slide groove (12), and the adapter frame (121) is threadably engaged with the screw rod (31); A motor (32) installed at a preset position and used to rotate the screw rod (31); The preset position is a portion of the frame (10) close to the front of the forklift and at the end of the slide groove (12); The forklift further comprises: a position sensor (44), which is arranged in the middle of the screw rod (31) and corresponds to the position where the second cylinder assembly (23) is hinged to the telescopic boom (21), and is used to sense the position of the adapter frame (121) on the screw rod (31); The control method comprises: When the position sensor (44) is touched during the process of controlling the forklift to enter the super-high operation state, it is determined that the designated position has been reached and the super-high operation state has been entered.

3. The control method of the anti-overload container double-arm forklift according to claim 2 is characterized in that: In step S2, the process of controlling the forklift to enter the super-high operation state and start working specifically includes: S21, driving the second oil cylinder assembly (23) so that the fork frame assembly (211) reaches at least a minimum second standard height H3; S22, in the process of controlling the driving assembly to drive the adapter frame (121) to move toward the position of the position sensor (44), the telescopic end of the second oil cylinder assembly (23) is simultaneously controlled to retract, so that the fork frame assembly (211) maintains a height.

4. The control method of the anti-overload container double-arm forklift according to claim 2 is characterized in that: In step S2, the process of controlling the forklift to enter the anti-overload state and start working specifically includes: S21, driving the second oil cylinder assembly (23) so that the fork frame assembly (211) reaches at least a minimum second standard height H3; S22, in the process of controlling the driving component to drive the adapter frame (121) to move toward the position of the position sensor (44), simultaneously controlling the telescopic end of the second oil cylinder component (23) to retract, so that the height of the fork frame component (211) is maintained; S23, when the position sensor (44) is touched, the driving assembly is controlled to drive the adapter frame (121) to move toward the extreme position of the screw rod (31) close to the front of the vehicle, and at the same time, the telescopic end of the second cylinder assembly (23) is controlled to extend so that the height of the fork frame assembly (211) is maintained.

5. The control method of the anti-overload container double-arm forklift according to claim 4 is characterized in that: The portion of the vehicle frame (10) within the slide groove (12) is provided with a guide rail (122), and the extension direction of the guide rail (122) is consistent with the extension direction of the slide groove (12); The adapter frame (121) is slidably embedded in the guide rail (122); There is a fixed gap between the bottom of the adapter frame (121) and the bottom of the slide groove (12), and the middle of the adapter frame (121) fits with the top of the guide rail (122).

6. The control method of the anti-overload container double-arm forklift according to claim 5 is characterized in that: The second oil cylinder assembly (23) comprises a third oil cylinder (231) and a fourth oil cylinder (232) connected in series; The cylinder barrels of the third oil cylinder (231) and the fourth oil cylinder (232) are fixed to each other, and their extension and contraction directions are opposite; The telescopic end of the third oil cylinder (231) is hinged to the adapter frame (121), and the telescopic end of the fourth oil cylinder (232) is hinged to the telescopic lifting arm (21).

7. The control method of the anti-overload container double-arm forklift according to claim 6 is characterized in that: The third oil cylinder (231) and the fourth oil cylinder (232) are of the same model.

8. The control method of the anti-overload container double-arm forklift according to claim 7 is characterized in that: The cylinder lengths of the third oil cylinder (231) and the fourth oil cylinder (232) are 0.6 to 1.2 meters, and the ratio of cylinder length to stroke is 3:2.

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