A three-way electric stacker accessory

Abstract

The present application relates to the technical field of stacking equipment, and discloses a three-way electric stacking accessory, the end of the fork is hingedly connected with a diagonal support head, a friction plate is arranged between the lower side of the load bearing plate and the fork, one side of the friction plate is fixedly connected with the diagonal support head, and the other side is fixedly connected with the fork through a reset elastic element, and the diagonal support head is connected with a diagonal support assembly through a pulling element. When initially lifting, the value change measured by the pressure sensor can reflect whether there is a tail lifting and side turning trend, the value ratio measured by the two side tension sensors can reflect the center of gravity deviation, meanwhile, along with the extraction of goods, the diagonal support head provides support to the edge of the support surface, which can effectively improve the lateral load bearing capacity of the fork truck with the installed accessory, secondly, by using the direct proportional relationship between pressure and friction, the center of gravity deviation of the goods is judged by the friction resistance ratio when the two friction plates move, and the fork entry position is adjusted accordingly.

Description

Technical Field

[0001] This invention relates to the field of stacking equipment technology, specifically a three-way electric stacking attachment. Background Technology

[0002] Three-way stacking attachments are special attachments mounted on forklifts that allow stacking operations in three directions: left, front, and right. Integrated with the forks, they can carry the forks for lateral movement, enabling the forklift to directly pick up goods laterally without needing to turn, thus enabling the forklift to move and stack goods in narrow aisles.

[0003] When a forklift is under load, the front wheels act as a fulcrum, with the forklift body providing the ballast weight. When attachments are installed, the lever arm of the forks is significantly increased. Under the same weight, the load-bearing torque increases, while the forklift's load-bearing torque remains constant. This significantly reduces the forklift's load-bearing capacity, resulting in an actual load-bearing capacity far less than the forklift's nominal weight. This can easily cause the forklift to tip over during operation. On the other hand, when lifting goods laterally, the center of gravity extends beyond the side of the forklift body. In this case, the side wheels act as a fulcrum, shortening the ballast arm, reducing the ballast torque, and further decreasing the forklift's load-bearing capacity, making it more prone to tipping over.

[0004] Secondly, during stacking, the forks lift the pallet of goods, causing the goods to rise and fall. Generally speaking, the area between the two forks is much smaller than the area of ​​the pallet. Different goods have different weights, and sometimes the center of gravity of the goods on the pallet may be biased to one side. It is difficult to judge the goods by appearance alone. When the forklift moves, if the center of gravity of the goods is biased to one side, even a slight sway can easily cause the goods to shake, and in severe cases, the goods may tip over. Summary of the Invention

[0005] To address the shortcomings of the aforementioned background technology, this invention provides a technical solution for a three-way electric stacking attachment. During the initial lifting, the changes in values ​​measured by the pressure sensor can reflect whether there is a tendency for the load to lift or tip over, and the ratio of values ​​measured by the tension sensors on both sides can reflect the deviation of the center of gravity. Simultaneously, as the goods are being lifted, the inclined support head provides support to the edge of the support surface, which can effectively improve the lateral load-bearing capacity of the forklift with the attachment installed. Furthermore, by utilizing the direct proportional relationship between pressure and friction, the ratio of the frictional resistance when the friction plates on both sides move can be used to determine the deviation of the center of gravity of the goods, and the fork entry position can be adjusted according to the deviation to ensure that the center of gravity is in the middle position of the two forks, thus solving the problems raised in the background technology.

[0006] The present invention provides the following technical solution: a three-way electric stacking attachment, including a side-shifting frame connected to a forklift lifting frame, a side-shifting frame assembly slidably connected to the side-shifting frame, a rotating frame assembly connected to the side-shifting frame assembly, and a fork connected to the rotating frame assembly via a connecting frame; A load-bearing plate is movably connected to the upper end of the fork. A diagonal support head is hinged to the end of the fork. A friction plate is provided between the lower side of the load-bearing plate and the fork. One side of the friction plate is fixedly connected to the diagonal support head, and the other side is fixedly connected to the fork through a reset spring member. The diagonal support head is connected to a diagonal support assembly through a pulling member. The diagonal support assembly drives the diagonal support head to rotate toward the support surface through the pulling member. A ground contact detection element is provided at the distal end of the diagonal support head. The ground contact detection element is used to sense whether the end of the diagonal support head is in contact with the support surface. A tension sensor is provided between the diagonal support head and the friction plate or between the diagonal support head and the diagonal support assembly. The tension sensor is used to monitor the change in tension between the diagonal support head and the friction plate. When the diagonal support assembly lifts the goods, it drives the diagonal support head to rotate so that the ground contact detection element is always in contact with the ground. When the goods are lifted to a certain height or leave the support surface, the diagonal support assembly resets.

[0007] Preferably, the bottom of the load-bearing plate is provided with a cylindrical protrusion, the protrusion and the upper surface of the friction plate are both smooth, and the lower surface of the friction plate and the surface corresponding to the fork are both rough.

[0008] Preferably, the diagonal brace assembly includes a rotating shaft movably connected to the connecting frame and a drive motor fixedly connected to the connecting frame. The drive motor drives the rotating shaft to rotate. Both ends of the rotating shaft are provided with winding wheels. The pulling member is a steel wire rope. The two winding wheels are fixedly connected to the pulling members on the two forks respectively. The two winding wheels rotate synchronously to wind up the pulling member. The diagonal brace head is fixedly connected to a connecting shaft. The connecting shaft is hinged to the fork. The pulling member winds around the connecting shaft and is fixedly connected to the connecting shaft.

[0009] Preferably, the ground contact detection component includes a slider slidably connected to the diagonal support head, the slider is connected to a ground contact component, and the slider is connected to a pressure sensor via a spring. The pressure change of the pressure sensor determines whether the lowest point of the diagonal support head is in contact with the ground.

[0010] Preferably, the ground contact element is a rotating wheel, and the ground contact element is movably connected to the slider.

[0011] Preferably, the drive motor is connected to the rotating shaft via a drive gear, and an elastic plate is fixedly connected to the inner wall of the drive gear, the elastic plate being inserted into the side wall of the rotating shaft.

[0012] Preferably, when picking up goods in the forward direction, if the pressure sensor measures a value greater than a set value one and less than a set value two, it is determined that the pressure sensor is in contact with the support surface. If the pressure sensor measures a value less than a set value one, it is determined that the forklift is leaving the support surface. If the pressure sensor measures a value greater than a set value three, or if the pressure sensor measures a value greater than a set value one and does not decrease with lifting, it is determined that the forklift has a tendency to tip over or lift its tail.

[0013] Preferably, when picking up goods from the side, if it is determined that there is a tendency to tip over or lift up, the diagonal brace assembly is controlled to drive the diagonal brace head to rotate to the maximum angle. Finally, the lowest point of the diagonal brace head keeps in contact with the support surface. When the edge of the support surface is moved, the diagonal brace assembly rotates in the opposite direction by a set angle. If the pressure sensor detects a decrease in value, it is determined that there is no tendency to tip over. If the pressure sensor value remains unchanged, it is determined that there is a tendency to tip over.

[0014] The present invention has the following beneficial effects: 1. During the initial lifting process, the pressure sensor readings of this three-way electric stacking attachment can reflect whether there is a tendency for the forklift to lift or tip over. The ratio of the readings from the tension sensors on both sides can reflect the deviation of the center of gravity. At the same time, the diagonal support head can provide appropriate support force to prevent lifting and tipping, thereby ensuring the safety of the forklift during operation. Furthermore, as goods are being lifted, the diagonal support head provides support to the edge of the support surface, which can effectively improve the lateral load-bearing capacity of the forklift with the attachment installed.

[0015] 2. This three-way electric stacking attachment uses the direct proportional relationship between pressure and friction to determine the deviation of the center of gravity of the goods by the ratio of the friction resistance when the friction plates on both sides move. Based on the deviation, the fork entry position is adjusted to ensure that the center of gravity is in the middle position of the two forks. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the overall structure of the present invention; Figure 3 This is a side view of the forks in this invention; Figure 4 This is a schematic diagram of the diagonal brace assembly in this invention; Figure 5 For the present invention Figure 3 Enlarged view of A in the middle; Figure 6 This is a schematic diagram of the ground contact detection component in this invention; Figure 7 This is a schematic diagram of the drive gear in this invention.

[0017] In the diagram: 1. Side-shifting frame; 2. Side-shifting frame assembly; 3. Rotating frame assembly; 21. Drive wheel; 22. Clamping wheel; 4. Connecting frame; 5. Fork; 6. Load-bearing plate; 7. Diagonal brace head; 71. Connecting shaft; 72. Vertical slot; 8. Pulling component; 9. Diagonal brace assembly; 91. Rotating shaft; 92. Drive motor; 93. Drive wheel; 94. Drive gear; 95. Elastic plate; 10. Friction plate; 101. Rack; 11. Reset spring component; 12. Ground contact detection component; 121. Slider; 122. Ground contact component; 123. Spring; 124. Pressure sensor; 13. Tension sensor. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-3 A three-way electric stacking attachment includes a side-shifting frame 1 connected to a forklift lifting frame. The side-shifting frame 1 is mounted on the forklift lifting frame and is raised and lowered under the driving force of the forklift. The side-shifting frame 1 is slidably connected to a side-shifting frame assembly 2. The side-shifting frame assembly 2 is provided with two sets of clamping wheels 22. The clamping wheels clamp the side-shifting frame 1 to ensure that there is no shaking between the side-shifting frame 1 and the side-shifting frame assembly 2. The side-shifting frame 1 is provided with a groove to accommodate the movement of the clamping wheels 22. The side-shifting frame assembly 2 is equipped with a drive wheel 21, which is connected to a servo motor. The side-shifting frame 1 is provided with a rack 101 corresponding to the drive wheel 21. The servo motor drives the drive wheel 21 to rotate, thereby causing the side-shifting frame assembly 2 to move relative to the side-shifting frame 1. The side-shifting frame assembly 2 is connected to a rotating frame assembly 3. The rotating frame assembly 3 is connected to a fork 5 through a connecting frame 4. The rotating frame assembly 3 drives the connecting frame 4 to rotate, so that the fork 5 faces the front or any side. A load-bearing plate 6 is movably connected to the upper end of the fork 5. The load-bearing plate 6 is embedded in the upper end of the fork 5. The load-bearing plate 6 can slide vertically with the fork 5, or it can be hinged to the fork 5 on one side. In this embodiment, the side of the load-bearing plate 6 facing the vehicle body is hinged to the fork 5. A diagonal support head 7 is hinged to the end of the fork 5. A friction plate 10 is provided between the lower side of the load-bearing plate 6 and the fork 5. One side of the friction plate 10 is fixedly connected to the diagonal support head 7, and the other side is fixedly connected to the fork 5 through a reset spring member 11. The load-bearing plate 6 presses against the friction plate 10, bearing... The greater the weight of the load on the load-bearing plate 6, the greater the pressure on the friction plate 10, and the greater the resistance to movement of the friction plate 10. The weight borne by the load-bearing plate 6 is determined by the resistance to movement of the friction plate 10. The diagonal support head 7 is connected to the diagonal support assembly 9 via the pulling member 8. The diagonal support assembly 9 drives the diagonal support head 7 to rotate toward the support surface via the pulling member 8. A ground contact detection element 12 is provided at the distal end of the diagonal support head 7. The ground contact detection element 12 is used to detect whether the end of the diagonal support head 7 is in contact with the support surface, so as to avoid excessive pressure on the support surface by the diagonal support head 7. A tension sensor 13 is provided between the friction plate 10 and the inclined support head 7 or between the inclined support assembly 9. The tension sensor 13 is used to monitor the change in tension between the inclined support head 7 and the friction plate 10. When the tension sensor 13 is located between the inclined support head 7 and the inclined support assembly 9, it can also monitor the force between the ground contact detection element 12 and the supporting surface. When the inclined support assembly 9 lifts the goods, it drives the inclined support head 7 to rotate, so that the ground contact detection element 12 is always in contact with the ground. When the goods are lifted to a certain height or leave the supporting surface, the inclined support assembly 9 resets, and the inclined support head... The maximum rotation angle of 7 is less than 90 degrees. When the load-bearing plate 6 lifts the goods, the pressure of the goods acts between the load-bearing plate 6 and the friction plate 10, and the pulling force required to pull the friction plate 10 increases. At the same time, the ground contact detection component 12 detects that the diagonal support head 7 leaves the ground. The diagonal support assembly 9 drives the diagonal support head 7 to rotate, so that the diagonal support head 7 rotates to contact the ground. At the same time, the pressure change of the tension sensor 13 is monitored. If the ratio between the maximum values ​​of the tension sensors 13 on the two forks 5 is not within the set range, it indicates that the center of gravity is too off and needs to be adjusted.

[0020] Please see Figure 3 The bottom of the load-bearing plate 6 is provided with a cylindrical protrusion. The protrusion and the upper surface of the friction plate 10 are both smooth, while the lower surface of the friction plate 10 and the corresponding surface of the fork 5 are both rough. The roughness is moderate to ensure that the friction plate 10 can move under the maximum load. The friction coefficient between the friction plate 10 and the fork 5 determines the friction coefficient when the friction plate 10 moves, ensuring that the friction force of the friction plate 10 is uniform and avoiding the deformation of the load-bearing plate 6 and the resistance changes caused by the different sizes of the protrusion.

[0021] Please see Figure 4The diagonal brace assembly 9 includes a rotating shaft 91 movably connected to the connecting frame 4 and a drive motor 92 fixedly connected to the connecting frame 4. The drive motor 92 drives the rotating shaft 91 to rotate. A reducer is provided between the rotating shaft 91 and the drive motor 92 to increase the torque when the rotating shaft 91 rotates. The rotating shaft 91 or the drive motor 92 is provided with a locking structure, which unlocks when the drive motor 92 drives the rotating shaft 91 to rotate and locks naturally when not driven. The locking structure between the motor and the drive shaft is widely used and is known technology. This application will not describe the locking structure. Both ends of the rotating shaft 91 are provided with winding wheels 93. The pulling member 8 is a steel wire rope. The two winding wheels 93 are fixedly connected to the pulling members 8 on the two forks 5 respectively. The two winding wheels 93 rotate synchronously to wind up the pulling member 8. Please refer to [link to relevant documentation]. Figure 5 The diagonal support head 7 is fixedly connected to the connecting shaft 71, which is hinged to the fork 5. The pulling member 8 is wound around the connecting shaft 71 and fixedly connected to it. The fork 5 and the diagonal support head 7 are provided with slots for the pulling member 8 to pass through. The winding wheel 93 winds up and pulls the connecting shaft 71 to rotate, which in turn drives the diagonal support head 7 to rotate. Since the winding wheel 93 rotates synchronously, the speed and acceleration of the pulling members 8 on both sides of the friction plate 10 are exactly the same, which makes the ratio of the values ​​measured by the tension sensors 13 on both sides more accurate in feeding back the center of gravity offset.

[0022] Please see Figure 6 The ground contact detection component 12 includes a slider 121 that is slidably connected to the inclined support head 7. The inclined support head 7 has vertical grooves 72 on both sides corresponding to the slider 121. The slider 121 is connected to a ground contact component 122. The slider 121 is connected to a pressure sensor 124 through a spring 123. When the inclined support head 7 rotates to contact the support surface, the pressure is transmitted to the pressure sensor 124. The pressure change of the pressure sensor 124 determines whether the lowest point of the inclined support head 7 is in contact with the ground.

[0023] The ground contact element 122 is a rotating wheel. The ground contact element 122 is movably connected to the slider 121. After the forks 5 and the load-bearing plate 6 lift the goods, the ground contact element 122 supports the ground. The rotation of the ground contact element 122 can reduce the force between the goods and the supporting surface when the goods are pulled out.

[0024] Please see Figure 4 and Figure 7 The drive motor 92 is connected to the rotating shaft 91 via the drive gear 94. The drive gear 94 and the output shaft of the drive motor 92 mesh. The locking structure is used to lock the drive motor 92 or the drive gear 94. An elastic plate 95 is fixedly connected to the inner wall of the drive gear 94. The elastic plate 95 is inserted into the side wall of the rotating shaft 91, so that the drive gear 94 and the elastic plate 95 are roughly rigid in transmission, but also elastic in a small range. This makes the value of the pressure sensor 124 more controllable when the drive brace head 7 rotates and the pressure sensor 124 touches the ground and stops. At the same time, the pressure changes of the tension sensor 13 and the pressure sensor 124 are more significant when the vehicle rolls over or lifts its tail.

[0025] When picking up goods in the forward direction, the pressure sensor 124 is connected to a processor. When the value measured by the pressure sensor 124 is greater than a set value one and less than a set value two, the processor determines that the diagonal support head 7 is in contact with the support surface. When the value measured by the pressure sensor 124 is less than the set value one, it determines that the forklift is leaving the support surface. That is, when the value measured by the pressure sensor 124 is less than the set value one, the diagonal support assembly 9 operates. When the value reaches the set value two, it stops operating. When the value measured by the pressure sensor 124 is greater than the set value three, or when the value measured by the pressure sensor 124 is greater than the set value one and does not decrease with lifting, it is determined that the forklift has a tendency to tip over or lift its tail. The value three is greater than the value two. If, during lifting, there is a sudden tendency to tip over or lift its tail due to vibration or other reasons, the value of the pressure sensor 124 will suddenly increase from the normal range to greater than the value three. If there is a tendency to tip over or lift its tail from the beginning, the weight of the goods will directly act on the diagonal support head 7, making the value measured by the pressure sensor 124 larger and further increasing with lifting.

[0026] When picking up goods from the side, if there is a tendency to tip over or lift the tail, the diagonal brace assembly 9 drives the diagonal brace head 7 to rotate to the maximum angle. The rotation angle is adapted to the initial lifting height. The lowest point of the diagonal brace head 7 keeps in contact with the support surface. When the edge of the support surface is moved, the diagonal brace assembly 9 rotates in the opposite direction at the set angle. If the value measured by the pressure sensor 124 decreases, it means that tipping will not occur. If the value of the pressure sensor 124 remains unchanged, there is a risk of tipping. It is necessary to stop picking up the goods and put the goods back in their original position.

[0027] The working principle and workflow of the invention: When placing goods in the stacking position, first insert the forks 5 and the load-bearing plate 6 under the pallet, control the forklift to rise to a certain height, so that the pallet leaves the support surface. When the pallet leaves the support surface, the diagonal support head 7 always remains in contact with the support surface. During the initial lifting, if the ratio of the values ​​measured by the tension sensors 13 on both sides is too large or too small, it indicates that the center of gravity of the goods is biased to one side. Immediately stop lifting and lower the forks 5 and the load-bearing plate 6 back to the initial position. Readjust the position of the forks 5 and the load-bearing plate 6, adjusting the forks 5 and the load-bearing plate 6 towards the side with the smaller measured value, and try lifting again until the ratio is within the set range. During the lifting process to the initial height, before the pallet leaves the support, as the force between the forks 5, the load-bearing plate 6, and the pallet increases, when the load-bearing torque exceeds the ballast torque, some force will be distributed to the diagonal support head 7, and this will ultimately be reflected by the value of the pressure sensor 124. If the value measured by the pressure sensor 124 is directly greater than the set value one and does not increase with lifting, it indicates that as the force between the forks 5, the load-bearing plate 6, and the pallet increases, more force is distributed to the diagonal support head 7, and the forklift has a tendency to lift its tail or tip over. After leaving the ground, when the load-bearing torque is close to the maximum ballast torque, if a sudden lifting or tipping occurs due to vibration or other reasons, the weight of the cargo will suddenly act on the diagonal support head 7, and the pressure sensor 124 will measure a value greater than the value three. When it is determined that there is a tendency to tip over or lift its tail, the lifting will stop and an alarm will be issued to the operator. When the initial lifting is completed, if the stacking is to be completed laterally, in a location with sufficient space, first complete the lateral movement and observe whether the lateral movement will cause it to tip over.

[0028] When removing goods from the stack, the process is the same as when picking up goods from the stack in the forward direction. When picking up goods from the side, due to the greater lateral extension, there may be a tendency to tip over when the initial lifting is completed. At this time, the value of pressure sensor 124 is relatively large. As the goods are pulled out laterally, the lever arm becomes shorter and the load-bearing torque decreases. When it moves to the edge of the load-bearing surface, the diagonal brace assembly 9 rotates in the opposite direction at an appropriate angle. If the load-bearing torque and the ballast torque are balanced at this time, the value measured by pressure sensor 124 will become smaller. Otherwise, there will be no significant change.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-way electric stacking attachment, comprising a side-shifting frame (1) connected to a forklift lifting frame, wherein the side-shifting frame (1) is slidably connected to a side-shifting frame assembly (2), the side-shifting frame assembly (2) is connected to a rotating frame assembly (3), and the rotating frame assembly (3) is connected to forks (5) via a connecting frame (4), characterized in that: A load-bearing plate (6) is movably connected to the upper end of the fork (5). A diagonal support head (7) is hinged to the end of the fork (5). A friction plate (10) is provided between the lower side of the load-bearing plate (6) and the fork (5). One side of the friction plate (10) is fixedly connected to the diagonal support head (7), and the other side is fixedly connected to the fork (5) through a reset spring (11). The diagonal support head (7) is connected to a diagonal support assembly (9) through a pull member (8). The diagonal support assembly (9) drives the diagonal support head (7) to rotate toward the support surface through the pull member (8). A ground contact detection element (12) is provided at the distal end of the diagonal support head (7). The ground contact detection element (12) is used to sense whether the end of the diagonal support head (7) is in contact with the support surface. A tension sensor (13) is provided between the inclined support head (7) and the friction plate (10) or between the inclined support head (7) and the inclined support assembly (9). The tension sensor (13) is used to monitor the change in tension between the inclined support head (7) and the friction plate (10) when the friction plate (10) is pulled, and to determine the degree of center of gravity deviation based on the numerical relationship between the tension sensors (13) on both sides. If the ratio between the maximum values ​​of the tension sensors (13) on the two forks (5) is not within the set range, it indicates that the center of gravity is too biased. When the inclined support assembly (9) lifts the goods, it drives the inclined support head (7) to rotate so that the ground contact detection component (12) is always in contact with the ground. When the goods are lifted to a certain height or leave the support surface, the inclined support assembly (9) resets.

2. The three-way electric stacking attachment according to claim 1, characterized in that: The bottom of the load-bearing plate (6) is provided with a cylindrical protrusion. The protrusion and the upper surface of the friction plate (10) are both smooth, while the lower surface of the friction plate (10) and the corresponding surface of the fork (5) are both rough.

3. A three-way electric stacking attachment according to claim 1, characterized in that: The diagonal brace assembly (9) includes a rotating shaft (91) movably connected to the connecting frame (4) and a drive motor (92) fixedly connected to the connecting frame (4). The drive motor (92) drives the rotating shaft (91) to rotate. Both ends of the rotating shaft (91) are provided with winding wheels (93). The pulling member (8) is a steel wire rope. The two winding wheels (93) are fixedly connected to the pulling members (8) on the two forks (5) respectively. The two winding wheels (93) rotate synchronously to wind up the pulling member (8). The diagonal brace head (7) is fixedly connected to a connecting shaft (71). The connecting shaft (71) is hinged to the fork (5). The pulling member (8) winds around the connecting shaft (71) and is fixedly connected to the connecting shaft (71).

4. A three-way electric stacking attachment according to claim 3, characterized in that: The ground contact detection component (12) includes a slider (121) that is slidably connected to the inclined support head (7). The slider (121) is connected to a ground contact component (122). The slider (121) is connected to a pressure sensor (124) via a spring (123). The pressure change of the pressure sensor (124) determines whether the lowest point of the inclined support head (7) is in contact with the ground.

5. A three-way electric stacking attachment according to claim 4, characterized in that: The ground contact element (122) is a rotating wheel, and the ground contact element (122) is movably connected to the slider (121).

6. A three-way electric stacking attachment according to claim 4, characterized in that: The drive motor (92) is connected to the rotating shaft (91) via a drive gear (94). An elastic plate (95) is fixedly connected to the inner wall of the drive gear (94), and the elastic plate (95) is inserted into the side wall of the rotating shaft (91).

7. A three-way electric stacking attachment according to claim 6, characterized in that: When picking up goods in the forward direction, if the pressure sensor (124) measures a value greater than a set value one and less than a set value two, it is determined that the pressure sensor (124) is in contact with the support surface. If the pressure sensor (124) measures a value less than a set value one, it is determined that the forklift is leaving the support surface. If the pressure sensor (124) measures a value greater than a set value three, or if the pressure sensor (124) measures a value greater than a set value one and does not decrease with lifting, it is determined that the forklift has a tendency to tip over or lift its tail.

8. A three-way electric stacking attachment according to claim 6, characterized in that: When picking up goods from the side, if it is determined that there is a tendency to tip over or lift the tail, the diagonal brace assembly (9) is controlled to drive the diagonal brace head (7) to rotate to the maximum angle. Finally, the lowest point of the diagonal brace head (7) is in contact with the support surface. When the edge of the support surface is moved, the diagonal brace assembly (9) rotates in the opposite direction by a set angle. If the value measured by the pressure sensor (124) decreases, it is determined that there is no tendency to tip over. If the value of the pressure sensor (124) remains unchanged, it is determined that there is a tendency to tip over.

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