Adjustable forklift attachment for material lifting and stacking

Abstract

The invention relates to the technical field of forklifts, in particular to an adjustable forklift attachment for material lifting and stacking, which comprises a lifting gantry, a guide frame is vertically mounted on the front surface of the lifting gantry in a sliding manner, and forks are arranged at two ends of the guide frame; a positioning frame is movably arranged in an inner cavity of the through groove in a penetrating mode and corresponds to the gap in the tray body. A folding frame for pushing the material pushing plate to move horizontally is arranged between the material pushing plate and the vertical section of the outer fork; the material pushing device has the beneficial effects that the vertically-arranged material pushing plate is installed on the front face of the vertical section of the outer fork through the folding frame, the sliding blocks are rotationally installed at the two ends of the folding frame, and the sliding blocks are installed in the outer fork and the positioning frame in a sliding mode and inserted into gaps in the surface of the tray body, so that the tray body can be prevented from relatively sliding on the outer fork; and when the materials are stacked, the folding frame is unfolded, the zip-top can materials are pushed to be away from the forklift through the material pushing plate, and the materials are conveniently stacked and stacked.

Description

Technical Field

[0001] The invention relates to the technical field of forklifts, in particular to an adjustable forklift attachment for lifting and stacking materials. Background Art

[0002] A forklift is an industrial handling vehicle, which refers to various wheeled handling vehicles used for loading and unloading, stacking and short-distance transportation of palletized goods. The fork, as the most basic forklift attachment, is often used to transport palletized goods.

[0003] In the prior art, a Chinese utility model with publication number CN201777853U discloses a mounted single and double pallet fork for a forklift. The single and double pallet forks can be switched and moved left and right according to the needs of on-site operations. They can carry a single pallet or two pallets side by side at the same time.

[0004] At present, when a forklift lifts and stacks materials, the forklift needs to actively retreat to separate from the material pallet. However, in the can manufacturing industry, due to the characteristics of light can materials and high stacking layers, the forklift is likely to move the can materials together when retreating, thereby causing the materials to collapse. Therefore, the present invention proposes an adjustable forklift attachment for lifting and stacking materials to solve the above problem. Summary of the invention

[0005] The object of the present invention is to provide an adjustable forklift attachment for material lifting and stacking, so as to solve the problem in the above-mentioned background technology that the forklift is prone to cause the can materials to collapse when stacking can materials.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an adjustable forklift attachment for material lifting and stacking, comprising a lifting mast, a guide frame is vertically slidably mounted on the front of the lifting mast, both ends of the guide frame are provided with forks, the forks include an inner fork and an outer fork, a storage groove is provided on the lower side of the horizontal section of the outer fork, and a plurality of through grooves distributed at equal intervals are penetrated on the upper surface of the horizontal section of the outer fork; The outer sides of the inner fork and the outer fork are sleeved with a pallet body, and the inner cavity of the through slot is movably penetrated by a positioning frame, and the positioning frame corresponds to the gap on the pallet body; A pushing plate is arranged on the front side of the vertical section of the outer fork, and a folding frame for pushing the pushing plate to move horizontally is arranged between the pushing plate and the vertical section of the outer fork.

[0007] Preferably, the folding frame is in an "X" shape and has a pin shaft rotatably inserted in the middle. Both ends of the folding frame close to the outer fork vertical section are rotatably connected to sliding blocks through pin shafts. An open groove for slidingly installing the sliding block is opened on the front side of the outer fork vertical section, and a double-headed screw for driving the sliding block to slide is rotatably installed in the open groove.

[0008] Preferably, threads are provided at both the upper and lower ends of the double-headed screw, and the thread directions are opposite. The double-headed screw is movably and penetratingly connected to the sliding block through the threads, and the double-headed screw is driven to rotate by a motor.

[0009] Preferably, avoiding grooves corresponding to the other two ends of the folding frame are provided on the surface of the pushing plate. Guide sliding grooves are provided on the inner walls on both sides of the avoiding groove. The other two ends of the folding frame are both provided with pin shafts penetrating through them, and the two ends of the pin shaft are respectively slidably inserted into the two guide sliding grooves.

[0010] Preferably, a recessed groove is provided in the middle of one side surface of the pushing plate, and a suspension rod is rotatably installed in the inner cavity of the recessed groove. The suspension rod is inclined, and the upper end of the suspension rod is rotatably connected to the folding frame through a pin shaft.

[0011] Preferably, a fixed frame is provided below the positioning frame. The fixed frame is in a "C" shape with an upward opening. The two sides of the fixed frame are respectively fixedly connected to the inner walls on both sides of the storage groove. Guide vertical grooves are provided on both side surfaces of the fixed frame. The positioning frame is in a "C" shape with a downward opening, and the two ends of the positioning frame are respectively movably inserted into the inner cavities of the two guide vertical grooves.

[0012] Preferably, strip-shaped sliders are fixedly installed at both ends of the positioning frame, and the cross-section of the strip-shaped slider is in a "square" shape. A connecting shaft is fixed between the two strip-shaped sliders. A collar is movably sleeved on the outer side of the connecting shaft, and an elastic suspension rope is fixed on the outer side of the collar.

[0013] Preferably, a through hole is penetratingly provided in the middle of the crossbeam part of the fixed frame. A strip-shaped sliding plate is movably and penetratingly arranged in the inner cavity of the through hole, and the strip-shaped sliding plate is driven to slide by a telescopic member. One ends of the plurality of elastic suspension ropes are all fixedly connected to the strip-shaped sliding plate. A shaft rod is provided on the lower side of the middle part of the elastic suspension rope, and the end of the shaft rod is fixedly connected to the inner side wall of the storage groove. The elastic suspension rope is wound around the outer side of the shaft rod in a "V" shape with a downward opening.

[0014] Preferably, chamfered edges are provided on the lower sides of the front ends of the outer fork and the inner fork. A double-support oil cylinder is fixed to the back surface of the vertical section of the inner fork, and the movable end of the double-support oil cylinder is fixed to the back surface of the vertical section of the outer fork.

[0015] Preferably, an adjustable-distance oil cylinder is fixed on the surface of the lifting gantry, and the movable end of the adjustable-distance oil cylinder is fixedly connected to the back surface of the vertical section of the inner fork. The guide frame is in a "square" shape and is lifted by a lifting chain located on the side of the lifting gantry. The upper and lower sections of the guide frame are both hollow cylindrical shapes, and guide rods are movably inserted at both ends. One end of the guide rod is fixedly connected to the inner fork.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The present invention installs a vertically arranged pushing plate on the front side of the vertical section of the outer fork through a folding frame, and sliding blocks are rotatably installed at both ends of the folding frame, and the sliding blocks are slidably installed inside the outer fork, and the two sliding blocks are driven by a double-headed screw and have opposite sliding directions. A through groove is opened on the upper surface of the horizontal section of the outer fork, and a positioning frame is vertically slidably installed in the inner cavity of the through groove. When the outer fork is inserted into the interior of the pallet body, the positioning frame slides up and inserts into the gap on the surface of the pallet body, which can avoid relative sliding of the pallet body on the outer fork, improve the stability of the forklift in conveying the pallet body and materials, and when stacking materials, the positioning frame moves down and separates from the pallet body, and then the folding frame is unfolded and pushes the can material away from the forklift through the pushing plate, which is convenient for stacking and palletizing of materials and avoids the collapse of other materials due to the retreat of the fork. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a three-dimensional schematic diagram of the outer fork structure of the present invention; Figure 4 It is a partially cutaway schematic diagram of the outer fork structure of the present invention; Figure 5 It is a schematic diagram of the connection between the positioning frame and the outer fork structure of the present invention; Figure 6 It is a three-dimensional schematic diagram of the positioning frame structure of the present invention; Figure 7 It is an exploded schematic diagram of the push plate and the outer fork structure of the present invention; Figure 8 It is a three-dimensional schematic diagram of the push plate structure of the present invention.

[0018] In the figure: 1. lifting door frame; 11. lifting chain; 12. distance adjustment cylinder; 2. guide frame; 3. inner fork; 31. double support cylinder; 4. outer fork; 41. storage slot; 42. through slot; 43. chamfer; 5. pallet body; 6. push plate; 61. folding frame; 611. sliding block; 612. double-headed screw; 62. suspension rod; 63. avoidance groove; 631. guide slide groove; 64. recessed groove; 7. positioning frame; 71. fixing frame; 711. guide vertical groove; 712. through hole; 72. strip slider; 721. connecting shaft; 73. elastic lifting rope; 731. ring; 74. strip slide plate; 75. telescopic member; 76. shaft rod. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 8 , the present invention provides a technical solution: Embodiment 1, an adjustable forklift attachment for material lifting and stacking, comprising a lifting gantry 1, a guide frame 2 is vertically slidably installed on the front of the lifting gantry 1, the guide frame 2 is in a "mouth" shape, and is lifted by a lifting chain 11 located on the side of the lifting gantry 1, a rotatable sprocket known in the prior art is installed on the top of the lifting gantry 1, and is used to wind up the lifting chain 11, thereby lifting the guide frame 2, and both ends of the guide frame 2 are provided with forks, and the lifting of the guide frame 2 can drive the lifting of the forks; The fork comprises an inner fork 3 and an outer fork 4, and a pallet body 5 is sleeved on the outer sides of the inner fork 3 and the outer fork 4. Figure 1 As shown, the two forks are in a folded state, but a gap is left between the two forks to form a new combined fork. This state is a single pallet fork, which can be used to transport and lift a single pallet body 5. Figure 2 As shown, the two forks are unfolded mutually, and this state is a double pallet fork, which can simultaneously transport and lift two parallel pallet bodies 5; Secondly, a receiving groove 41 is provided on the lower side of the horizontal section of the outer fork 4, and a plurality of through grooves 42 distributed at equal intervals are provided on the upper surface of the horizontal section of the outer fork 4. A positioning frame 7 is movably provided in the inner cavity of the through groove 42, and the positioning frame 7 corresponds to the gap on the pallet body 5, such as Figure 5 and Figure 3 As shown, the positioning frame 7 can move up and down in the inner cavity of the through slot 42 along the vertical direction. When the positioning frame 7 moves up to the upper side of the horizontal section of the outer fork 4, the upper half of the positioning frame 7 can be inserted into the gap on the pallet body 5 to position the pallet body 5, so as to prevent the pallet body 5 from sliding along the length direction of the horizontal section of the outer fork 4 and causing the pallet body 5 to separate from the fork, thereby improving the stability of the device when transporting and lifting the pallet body 5 and materials. On the contrary, after the positioning frame 7 moves down to separate from the pallet body 5, the positioning effect on the pallet body 5 can be released. Furthermore, a push plate 6 is provided on the front side of the vertical section of the outer fork 4, and a folding frame 61 is provided between the push plate 6 and the vertical section of the outer fork 4 to push the push plate 6 to move horizontally. Figure 3As shown, the folding frame 61 itself can be folded or unfolded. When the folding frame 61 is unfolded, the horizontal length of the folding frame 61 increases, thereby pushing the push plate 6 to move horizontally. In addition, the push plate 6 itself is in a suspended state, and a gap is left between the lower end of the push plate 6 and the horizontal section of the outer fork 4, and the gap size is greater than the thickness of the upper side of the pallet body 5. Therefore, when the push plate 6 moves horizontally, it only pushes the materials stacked on the upper side of the pallet body 5, and does not push the pallet body 5; In combination with the above, it can be seen that when the device is actually used: Switch between single and double support states according to actual needs. After the fork is inserted into the pallet body 5, the positioning frame 7 moves up and is inserted into the gap on the pallet body 5 to position the pallet body 5. The pallet body 5 and the material are lifted to a suitable height, and then according to needs: ① If the pallet body 5 needs to be stacked together with the materials, the positioning frame 7 is moved down to release the positioning of the pallet body 5, and then the folding frame 61 is unfolded to push the materials to move by the push plate 6. The friction between the materials and the pallet body 5 drives the pallet body 5 to move synchronously until the pallet body 5 is separated from the fork, and the materials and the pallet body 5 are stacked and palletized together; ② If only materials need to be stacked, the positioning frame 7 is not moved down, and the positioning frame 7 continues to position the pallet body 5. The folding frame 61 is directly unfolded and the material is pushed by the push plate 6 to move. At this time, the material moves on the pallet body 5 until it is separated from the pallet body 5, and the material is stacked and palletized separately.

[0021] In order to drive the folding frame 61 to unfold or fold, the folding frame 61 of the present application is in an "X" shape and a pin is inserted in the middle for rotation. The two strips of the folding frame 61 can rotate around the pin in the middle to achieve unfolding or folding. The two ends of the folding frame 61 close to the vertical section of the outer fork 4 are rotatably connected with a sliding block 611 through the pin. The sliding block 611 and the end of the folding frame 61 can rotate relative to each other to adapt to the rotation of the folding frame 61 around the pin in the middle of itself. An open groove for sliding the sliding block 611 is provided on the front of the vertical section of the outer fork 4. The sliding block 611 can only slide up and down in the inner cavity of the open groove. A double-headed screw 61 is rotatably installed in the open groove to drive the sliding block 611 to slide. 2. Threads are provided at both upper and lower ends of the double-headed screw 612, and the thread rotation directions are opposite. The double-headed screw 612 is movably connected with the sliding block 611 through the thread. The double-headed screw 612 is driven to rotate by a motor. When the double-headed screw 612 rotates, the threads at both ends of the double-headed screw 612 respectively drive the two sliding blocks 611 to slide synchronously in opposite directions. When the two sliding blocks 611 approach each other, the folding frame 61 is unfolded, and the height position of the center of gravity of the folding frame 61 remains unchanged. As the folding frame 61 is unfolded, the horizontal size of the folding frame 61 increases, so that the push plate 6 can be pushed to move horizontally away from the vertical section of the outer fork 4; conversely, when the two sliding blocks 611 move away from each other, the push plate 6 moves in the opposite direction and approaches the vertical section of the outer fork 4.

[0022] In order to ensure that the push plate 6 can stably push the material to move, the present application also has avoidance grooves 63 corresponding to the other two ends of the folding frame 61 on the surface of the push plate 6, and the other two ends of the folding frame 61 are respectively inserted into the two avoidance grooves 63. Guide slide grooves 631 are opened on the inner walls on both sides of the avoidance grooves 63. Pins are penetrated at the other two ends of the folding frame 61, and the two ends of the pins are respectively slidably plugged with the two guide slide grooves 631. The other two ends of the folding frame 61 are connected to the push plate 6 through the pins, thereby ensuring that the folding frame 61 and the push plate 6 will not separate from each other, and when the folding frame 61 is unfolded or folded , the pins at the other two ends of the folding frame 61 can slide in the inner cavity of the guide slot 631, thereby avoiding obstruction to the folding and unfolding of the folding frame 61. In addition, the folding frame 61 itself is a symmetrical structure, and the two ends of the folding frame 61 are installed inside the vertical section of the outer fork 4 through the sliding block 611. Therefore, the connection line of the other two ends of the folding frame 61 can remain parallel to the vertical section of the outer fork 4. In other words, no matter how the folding frame 61 is folded or unfolded, the push plate 6 remains parallel to the vertical section of the outer fork 4, that is, it remains in a vertical state. Therefore, when the push plate 6 moves, it can push the material on the pallet body 5. In addition, if Figure 1 As shown, when the device stacks and pallets a single pallet body 5, the two pusher plates 6 can respectively abut on both sides of the same surface of the material, thereby ensuring that the material is pushed stably and will not rotate to affect the stacking; Figure 2As shown, when the device stacks and palletizes two juxtaposed tray bodies 5, the two pushing plates 6 respectively abut against the surfaces of the two groups of materials. However, since the mutually adjacent sides of the two groups of materials can be mutually attached, even if only one pushing plate 6 in each group of materials is used to push it to move, the relative positions between the two groups of materials can be kept relatively fixed, and the stacking and palletizing will not be affected by the rotation of individual materials.

[0023] In order to suspend the pushing plate 6 and prevent the pushing plate 6 from moving in the vertical direction, the present application also has a recessed groove 64 opened in the middle of one side surface of the pushing plate 6, and a suspension rod 62 is rotatably installed in the inner cavity of the recessed groove 64. The suspension rod 62 is inclined, and the lower end of the suspension rod 62 and the pin shaft in the middle of the folding frame 61 are located at the same horizontal position. The length of the suspension rod 62 is one-fourth of the length of a strip monomer on the folding frame 61. The upper end of the suspension rod 62 is rotatably connected to the folding frame 61 through a pin shaft, as Figure 8 and Figure 7 shown. The connection point position between the upper end of the suspension rod 62 and the folding frame 61 is located at the upper quarter point of a strip monomer on the folding frame 61. Therefore, a ">"-shaped structure is formed between the upper quarter section of a strip monomer on the folding frame 61 and the suspension rod 62. No matter how the folding frame 61 is folded and unfolded, the folding frame 61 can suspend the pushing plate 6 through the suspension rod 62. And since the lower end of the suspension rod 62 can always be at the same horizontal position as the pin shaft in the middle of the folding frame 61, the height position of the pushing plate 6 remains unchanged during movement, and the pushing plate 6 only slides in the horizontal direction.

[0024] In order to prevent the positioning frame 7 from tilting and rotating and affecting the positioning effect on the tray body 5, the present application also has a fixing frame 71 arranged below the positioning frame 7. The fixing frame 71 is arranged in a "C" shape with an upward opening. The two sides of the fixing frame 71 are respectively fixedly connected to the inner walls of the two sides of the receiving groove 41. Guide vertical grooves 711 are opened on both side surfaces of the fixing frame 71. The positioning frame 7 is in a "C" shape with a downward opening, and the two ends of the positioning frame 7 are respectively movably inserted into the inner cavities of the two guide vertical grooves 711, as Figure 5 and Figure 6 shown. The positioning frame 7 can only slide up and down in the vertical direction. When the positioning frame 7 extends upward to the upper side of the horizontal section of the outer fork 4, the surface of the positioning frame 7 can abut against the inner side wall of the through groove 42, thereby preventing tilting and rotation and affecting the positioning effect on the tray body 5. When the positioning frame 7 moves downward to be inserted into the inner cavity of the guide vertical groove 711, the inner side wall of the guide vertical groove 711 can limit the positioning frame 7 to prevent the positioning frame 7 from tilting and rotating.

[0025] In order to realize the up and down movement of the positioning frame 7, the present application also has strip sliders 72 fixedly installed at both ends of the positioning frame 7, and the cross-section of the strip slider 72 is in the shape of a "mouth", and a connecting shaft 721 is fixed between the two strip sliders 72. The arrangement of the strip slider 72 and the connecting shaft 721 can further improve the stability of the sliding guide of the positioning frame 7, and prevent the positioning frame 7 from deforming itself and causing the end of the positioning frame 7 to be separated from the inner cavity of the guide vertical groove 711. A ring 731 is movably sleeved on the outer side of the connecting shaft 721, and an elastic suspension rope 73 is fixed on the outer side of the ring 731. The elastic suspension rope 73 is automatically The pallet body 5 has elastic deformation ability, and the positioning frame 7 can be driven to move upward by pulling the elastic hanging rope 73 upward. If the gap on the pallet body 5 does not correspond exactly to the positioning frame 7 after the fork of the device is inserted into the pallet body 5, the pallet body 5 will squeeze the positioning frame 7 downward under the action of gravity and stretch the elastic hanging rope 73, and then the pallet body 5 will slide slightly. After part of the positioning frame 7 (at least one positioning frame 7) corresponds to part of the gap (at least one gap) on the pallet body 5, the positioning frame 7 can automatically move upward and be inserted into the gap under the elastic force of the elastic hanging rope 73 to achieve the positioning of the pallet body 5.

[0026] In order to control the up and down movement of the positioning frame 7, the present application also has a through hole 712 running through the middle of the crossbeam of the fixing frame 71, and the inner cavity of the through hole 712 is movably penetrated by a strip slide 74, and the strip slide 74 is driven to slide by a telescopic member 75, and the telescopic member 75 can be a telescopic structure known in the prior art such as a cylinder and an oil cylinder. One end of a plurality of elastic suspension ropes 73 is fixedly connected to the strip slide 74, and a shaft rod 76 is provided on the lower side of the middle part of the elastic suspension rope 73, and the end of the shaft rod 76 is fixedly connected to the inner side wall of the storage groove 41, and the elastic suspension rope 73 is in a "V" shape with an opening downward and is wound around the outer side of the shaft rod 76, such as Figure 5 As shown, when the telescopic member 75 extends and pushes the strip slide 74 to slide, the strip slide 74 can pull the elastic suspension rope 73 and, through the shaft rod 76, lift the strip slide 72 in the circumferential direction of the elastic suspension rope 73, thereby lifting and moving the positioning frame 7 upward. Conversely, when the strip slide 74 slides in the opposite direction, the elastic suspension rope 73 releases the lifting of the positioning frame 7, and the positioning frame 7 can automatically move downward under the action of its own gravity. Therefore, the present device only needs to control the extension and retraction of the telescopic member 75 to control multiple positioning frames 7 to move up and down.

[0027] In order to switch the single-support and double-support states of the device, the present application also has chamfers 43 on the lower sides of the front ends of the outer fork 4 and the inner fork 3, which can facilitate the insertion of the outer fork 4 and the inner fork 3 into the interior of the pallet body 5, and a double-support cylinder 31 is fixed on the back of the vertical section of the inner fork 3, and the movable end of the double-support cylinder 31 is fixed to the back of the vertical section of the outer fork 4. When the double-support cylinder 31 is extended or retracted, the movable end of the double-support cylinder 31 can drive the outer fork 4 to move horizontally, thereby approaching or moving away from the inner fork 3, thereby being able to switch the single-support and double-support states of the device.

[0028] In order to adjust the distance between the two inner forks 3, the present application also has a distance adjusting cylinder 12 fixed on the surface of the lifting door frame 1, and the movable end of the distance adjusting cylinder 12 is fixedly connected to the back of the vertical section of the inner fork 3. When the distance adjusting cylinder 12 is extended or retracted, it is used to push the inner fork 3 to move horizontally, so that the distance between the two inner forks 3 can be adjusted. The upper and lower sections of the guide frame 2 are both hollow cylindrical, and guide rods are movably inserted at both ends. One end of the guide rod is fixedly connected to the inner fork 3. The guide rod is set to guide the sliding of the inner fork 3, and at the same time can support the inner fork 3 to prevent the distance adjusting cylinder 12 from bending and deformation due to force.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable forklift attachment for lifting and stacking materials, comprising a lifting mast (1), a guide frame (2) being vertically slidably mounted on the front of the lifting mast (1), and forks being arranged at both ends of the guide frame (2), characterized in that: The forklift tine includes an inner tine (3) and an outer tine (4). A storage groove (41) is formed on the lower side of the horizontal section of the outer tine (4), and a plurality of through grooves (42) evenly distributed at equal intervals are formed through the upper surface of the horizontal section of the outer tine (4). A tray body (5) is sleeved outside the inner tine (3) and the outer tine (4). A positioning frame (7) is movably penetrated through the inner cavity of the through groove (42), and the positioning frame (7) corresponds to the gap on the tray body (5). A pushing plate (6) is arranged on the front surface of the vertical section of the outer tine (4). A folding frame (61) for pushing the pushing plate (6) to move horizontally is arranged between the pushing plate (6) and the vertical section of the outer tine (4). Avoidance grooves (63) corresponding to the other two ends of the folding frame (61) are formed on the surface of the pushing plate (6). Guide sliding grooves (631) are formed on both inner walls of the avoidance grooves (63). The other two ends of the folding frame (61) are both penetrated with pin shafts, and the two ends of the pin shafts are respectively slidably inserted into the two guide sliding grooves (631). A concave groove (64) is formed in the middle of one side surface of the pushing plate (6), and a suspension rod (62) is rotatably installed in the inner cavity of the concave groove (64). The suspension rod (62) is obliquely arranged, and the upper end of the suspension rod (62) is rotatably connected to the folding frame (61) through a pin shaft.

2. The adjustable forklift attachment for material lifting and stacking according to claim 1, characterized in that: The folding frame (61) is in an "X" shape and is rotatably inserted with a pin shaft in the middle. Sliding blocks (611) are rotatably connected to both ends of the folding frame (61) close to the vertical section of the outer tine (4) through pin shafts. An opening groove for slidably installing the sliding blocks (611) is formed on the front surface of the vertical section of the outer tine (4), and a double-headed screw rod (612) for driving the sliding blocks (611) to slide is rotatably installed in the opening groove.

3. The adjustable forklift attachment for material lifting and stacking according to claim 2, characterized in that: Threads are formed at both the upper and lower ends of the double-headed screw rod (612), and the thread directions are opposite. The double-headed screw rod (612) is movably penetrated and connected to the sliding blocks (611) through the threads, and the double-headed screw rod (612) is driven to rotate by a motor.

4. The adjustable forklift attachment for material lifting and stacking according to claim 1, characterized in that: A fixing frame (71) is arranged below the positioning frame (7). The fixing frame (71) is in a "C" shape with an upward opening. Both sides of the fixing frame (71) are fixedly connected to both inner walls of the storage groove (41). Guide vertical grooves (711) are formed on both side surfaces of the fixing frame (71). The positioning frame (7) is in a "C" shape with a downward opening, and both ends of the positioning frame (7) are respectively movably inserted into the inner cavities of the two guide vertical grooves (711).

5. The adjustable forklift attachment for material lifting and stacking according to claim 4, characterized in that: Bar-shaped sliders (72) are fixedly installed at both ends of the positioning frame (7), and the cross section of the bar-shaped sliders (72) is in a "square" shape. A connecting shaft (721) is fixed between the two bar-shaped sliders (72). A collar (731) is movably sleeved outside the connecting shaft (721), and an elastic suspension rope (73) is fixed outside the collar (731).

6. The adjustable forklift attachment for material lifting and stacking according to claim 5, characterized in that: A through hole (712) is provided in the middle of the crossbeam of the fixing frame (71), a strip slide (74) is movably provided in the inner cavity of the through hole (712), and the strip slide (74) is driven to slide by a telescopic member (75), one end of each of the plurality of elastic suspension ropes (73) is fixedly connected to the strip slide (74), a shaft (76) is provided at the lower side of the middle of the elastic suspension rope (73), and the end of the shaft (76) is fixedly connected to the inner wall of the storage groove (41), and the elastic suspension rope (73) is wrapped around the outer side of the shaft (76) in a "V" shape with an opening downward.

7. The adjustable forklift attachment for material lifting and stacking according to claim 1, characterized in that: The lower sides of the front ends of the outer fork (4) and the inner fork (3) are both provided with oblique chamfers (43), a double-support oil cylinder (31) is fixed to the back of the vertical section of the inner fork (3), and the movable end of the double-support oil cylinder (31) is fixed to the back of the vertical section of the outer fork (4).

8. The adjustable forklift attachment for material lifting and stacking according to claim 1, characterized in that: A distance-adjusting oil cylinder (12) is fixed on the surface of the lifting gantry (1), and the movable end of the distance-adjusting oil cylinder (12) is fixedly connected to the back of the vertical section of the inner fork (3). The guide frame (2) is in the shape of a "mouth" and is lifted by a lifting chain (11) located on the side of the lifting gantry (1). The upper and lower sections of the guide frame (2) are both hollow cylindrical, and guide rods are movably inserted at both ends. One end of the guide rod is fixedly connected to the inner fork (3).

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