A high-efficiency carton folding device for carton processing

Abstract

The application relates to the paper box processing technical field and provides an efficient paper box folding device for paper box processing, which comprises a frame, a paperboard rack for placing folded paperboards, a sucking disc assembly, an upper guide plate and a lower guide plate, the upper guide plate and the lower guide plate are correspondingly arranged on the frame and are used for guiding the paperboards adsorbed by the sucking disc assembly to fold along the creases, so that the flat paperboards are unfolded into box shapes, a pneumatic cylinder is arranged on the frame, a push block is arranged at the top output end of the pneumatic cylinder, and a pair of first folding mechanisms are symmetrically arranged on the push block along the axis in one direction. The application overcomes the defects of the prior art, has reasonable design, compact structure, and the whole folding process of the bottom of the paper box is rapidly completed through the driving of a single pneumatic cylinder, the design simplifies the control logic, reduces the precision requirement, reduces the failure probability of the device, significantly improves the reliability and stability of the equipment, and the screw rod arranged on the top of the push block is convenient for folding the bottom-locked paper box.

Description

Technical Field

[0001] This invention relates to the field of cardboard box processing technology, and more specifically to a high-efficiency cardboard box folding device for cardboard box processing. Background Technology

[0002] With the rapid development of the modern packaging industry, cardboard boxes, as one of the important packaging materials, have increasingly higher requirements for production efficiency and quality. As a key piece of equipment in the cardboard box production process, the technical level and performance of cardboard box folding devices directly affect the production efficiency, cost and product quality of cardboard boxes. In the existing technology, the working efficiency of cardboard box folding devices is generally low and the structure is relatively complex.

[0003] Chinese invention patent application number "202111612922.4" discloses a cardboard box forming and bending machine, including a cardboard supply device and a cardboard unfolding and sealing device. The cardboard unfolding and sealing device has a cardboard inlet and a cardboard box outlet. The cardboard supply device has a cardboard outlet, and the cardboard outlet of the cardboard supply device is close to the cardboard inlet of the cardboard unfolding and sealing device. The cardboard supply device is used to transport cardboard box folding plates one by one to the cardboard unfolding and sealing device. The cardboard unfolding and sealing device is used to unfold the cardboard box folding plates and seal the bottom to form a cardboard box. It has a simple structure, flexible operation, and high processing efficiency.

[0004] Although the cardboard unfolding and sealing device in the above structure solves the problems of complex structure and low working efficiency of existing carton folding devices, it relies on multiple drives to control the folding of the bottom of the carton, which not only increases the complexity of operation but also increases the cost of equipment. More importantly, this design cannot meet the bottom folding requirements of lock-bottom cartons, limiting its wide application. Therefore, we propose a high-efficiency carton folding device for carton processing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-efficiency carton folding device for carton processing. It overcomes the deficiencies of existing technologies, has a reasonable design and compact structure, and solves the problems of existing methods requiring multiple drives to control the folding of the bottom of the carton, resulting in complex operation, high equipment costs, and inability to meet the bottom folding requirements of lock-bottom cartons.

[0006] Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a high-efficiency cardboard folding device for cardboard processing, comprising a frame, a cardboard rack for placing folded cardboard, a suction cup assembly, an upper guide plate and a lower guide plate, the upper guide plate and the lower guide plate being correspondingly arranged on the frame to guide the cardboard adsorbed by the suction cup assembly to fold along the fold seam, so that the flat cardboard unfolds into a box shape; a cylinder is provided on the frame, and a push block is provided at the top output end of the cylinder; a pair of first folding mechanisms are symmetrically arranged along the axis in one direction of the push block, and a pair of second folding mechanisms are symmetrically arranged along the axis in the other direction. The first folding mechanism is used to fold the front and back sides of the bottom of the carton, and the second folding mechanism is used to fold the left and right sides of the bottom of the carton. The first folding mechanism includes a folding plate that can swing back and forth, and the second folding mechanism includes a folding cylinder that can swing left and right. As the pusher moves vertically upward, the oppositely positioned folding plates swing back and forth to the front and rear sides of the bottom of the unfolded carton and bend inward. Then, the oppositely positioned folding cylinders swing left and right to the left and right sides of the bottom of the unfolded carton and bend inward to a horizontal position.

[0008] Furthermore, the first folding mechanism also includes a first positioning rod fixed to the frame. The first positioning rod is rotatably connected to the folding plate and is connected by a pair of torsion springs. The bottom of the folding plate is located on the upper side of the push block.

[0009] Furthermore, the second folding mechanism also includes a second positioning rod fixed on the frame. The second positioning rod is provided with a hollow block for the slide rod to slide. One end of the slide rod is located on the upper side of the push block, and the other end is rotatably connected to a swing arm. The two sides of the swing arm are rotatably connected to connecting rods connected to the second positioning rod, and the upper end of the swing arm is connected to the folding cylinder.

[0010] Furthermore, the folded tube has an internal cavity, and its top has several negative pressure holes communicating with the cavity; The swing arm is equipped with a negative pressure mechanism that communicates with the cavity. When the folding cylinder swings to make the unfolded carton bend inward, a negative pressure is formed in the cavity.

[0011] Furthermore, the negative pressure mechanism includes a piston chamber disposed within the swing arm and communicating with the cavity. A piston block is disposed within the piston chamber, and a spring is disposed between the piston block and the piston chamber. A pull rope is disposed at the bottom of the piston block and passes through the swing arm. One end of the pull rope passing through the swing arm is connected to a second positioning rod.

[0012] Furthermore, the push block has a frustum-shaped structure with a smaller top and a larger bottom, and a pair of screws are threadedly connected to the top of the push block. The push block has a threaded hole that is adjusted to match the screws.

[0013] Furthermore, the pair of screws are arranged symmetrically along the center line of the carton to be folded.

[0014] Furthermore, the folding plate includes folding parts for pushing the front and rear sides of the lower end of the carton after unfolding. The bottom of the folding part is provided with a rotating shaft that is rotatably connected to the first positioning rod. The bottom of the folding part is also provided with a first inclined part and a second inclined part located on the upper side of the push block. The first inclined part is located between the folding part and the second inclined part, and the first inclined part is in the same inclination direction as the side of the push block, while the second inclined part is in the opposite inclination direction to the side of the push block.

[0015] Furthermore, the second positioning rod includes a pair of positioning cylinders and a lead screw threaded between the pair of positioning cylinders, the lead screw being provided with a knob for easy rotation.

[0016] Furthermore, the relative height of the top of the folding cylinder is higher than the relative height of the top of the swing arm.

[0017] This invention provides a high-efficiency cardboard box folding device for cardboard box processing. It has the following beneficial effects: 1. Driven by a single cylinder, the folding plates, which are positioned opposite each other, swing in sequence, causing the front and rear sides of the bottom of the carton to bend inward and form an inclined bottom edge. Then, the folding cylinders, which are positioned opposite each other, swing inward and the left and right sides of the bottom of the carton to bend inward and level, thus quickly completing the entire folding process of the bottom of the carton. This design simplifies the control logic, reduces the accuracy requirements, reduces the probability of device failure, and significantly improves the reliability and stability of the equipment.

[0018] 2. During the folding process, the negative pressure holes attract the left and right sides of the bottom of the carton, preventing the bottom structure of the carton from deflecting into the inside of the carton during the folding process, which would cause glue gaps to form in subsequent steps and affect the overall folding quality of the carton.

[0019] 3. By setting a screw on the top of the push block, when the push block moves upward, the screw pushes the side of the carton with the tongue at the bottom upward into the gap at the bottom of the carton, which makes it easier to fold the lock-bottom carton. Attached Figure Description

[0020] Figure 1 This is a front-view perspective of the overall structure of the present invention; Figure 2 This is a top-view perspective view of the overall structure of the present invention; Figure 3 This is a front-view perspective three-dimensional schematic diagram of the folding mechanism structure of the present invention; Figure 4 This is a three-dimensional structural diagram of the folding mechanism of the present invention; Figure 5 This is a bottom-view three-dimensional structural diagram of the folding mechanism of the present invention; Figure 6 This is a three-dimensional schematic diagram of the folded tube structure of the present invention; Figure 7 This is a cross-sectional schematic diagram of the swing arm structure of the present invention; Figure 8 This is a three-dimensional schematic diagram of the lock-bottom type paper box structure of the present invention; Figure 9 This is a three-dimensional schematic diagram of the folded plate structure of the present invention; Figure 10 This is a three-dimensional schematic diagram of the second positioning rod structure of the present invention.

[0021] In the diagram: 1. Frame; 2. Cardboard frame; 3. Suction cup assembly; 4. Upper guide plate; 5. Lower guide plate; 6. Cylinder; 7. Push block; 71. Screw; 81. First positioning rod; 82. Folding plate; 821. Folding part; 822. Rotating shaft; 823. First inclined part; 824. Second inclined part; 83. Torsion spring; 91. Second positioning rod; 911. Positioning cylinder; 912. Lead screw; 92. Hollow block; 93. Slide rod; 94. Swing arm; 941. Piston chamber; 942. Piston block; 943. Spring; 944. Pull rope; 95. Connecting rod; 96. Folding cylinder; 961. Cavity; 962. Negative pressure hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0023] See attached document Figure 1-5 A high-efficiency cardboard folding device for cardboard processing includes a frame 1, a cardboard rack 2 for placing folded cardboard, a suction cup assembly 3, an upper guide plate 4, and a lower guide plate 5. The upper guide plate 4 and the lower guide plate 5 are respectively arranged on the frame 1 to guide the cardboard adsorbed by the suction cup assembly 3 to fold along the fold seam, so that the flat cardboard unfolds into a box shape. A plate-shaped cardboard is placed on the cardboard rack 2. By controlling the movement of the plate-shaped cardboard adsorbed by the suction cup assembly 3, the cardboard is folded along the fold seam under the limitation of the upper guide plate 4 and the lower guide plate 5, so that the flat cardboard unfolds into a box shape. A cylinder 6 is provided on the frame 1. A push block 7 is provided at the top output end of the cylinder 6. A pair of first folding mechanisms are symmetrically provided along the axis of the push block 7 in one direction and a pair of second folding mechanisms are symmetrically provided along the axis of the push block 7 in the other direction. The cylinder 6 drives the push block 7 to move upward, so that the first folding mechanism swings first, and then the second folding mechanism folds the bottom of the box-shaped carton when it swings. The first folding mechanism is used to fold the front and back sides of the bottom of the carton, and the second folding mechanism is used to fold the left and right sides of the bottom of the carton. A pair of first folding mechanisms push the front and back sides of the bottom of the carton inward to form an inclined device, and then a pair of second folding mechanisms push the left and right sides of the bottom of the carton inward to a horizontal position, at which point the folding of the bottom of the carton is completed. The first folding mechanism includes a folding plate 82 that can swing back and forth, and the second folding mechanism includes a folding cylinder 96 that can swing left and right. As the push block 7 moves vertically upward, the folding plates 82, which are arranged opposite each other, swing back and forth to the front and rear sides of the bottom of the unfolded carton and bend them inward, so that the front and rear sides of the bottom of the carton tilt inward. Then, the folding cylinder 96, which is arranged opposite each other, swings left and right to the left and right sides of the bottom of the unfolded carton and bends them inward to the horizontal, thus completing the folding of the bottom of the carton.

[0024] The first folding mechanism also includes a first positioning rod 81 fixed on the frame 1. The first positioning rod 81 is rotatably connected to the folding plate 82 and connected by a pair of torsion springs 83. The bottom of the folding plate 82 is set on the upper side of the push block 7. When the push block 7 moves vertically upward, the folding plate 82 is pressed and deflected on the first positioning rod 81, and squeezes the front and rear sides of the bottom of the carton, causing the front and rear sides of the bottom of the carton to deflect inward. Then the bottom of the push block 7 extends beyond the folding plate 82. At this time, the folding plate 82 is reset under the action of the torsion springs 83 to prevent the folding plate 82 from being located at the bottom of the carton and affecting the folding of the left and right sides of the bottom of the carton.

[0025] The second folding mechanism also includes a second positioning rod 91 fixed on the frame 1. The second positioning rod 91 is provided with a hollow block 92 for the slide rod 93 to slide. One end of the slide rod 93 is located on the upper side of the push block 7, and the other end is rotatably connected to a swing arm 94. The two sides of the swing arm 94 are rotatably connected to connecting rods 95 connected to the second positioning rod 91, and the upper end of the swing arm 94 is connected to the folding cylinder 96. When the push block 7 moves vertically upward, it will push the end of the slide rod 93, causing it to move away from the push block 7 along the hollow block 92. At this time, the bottom of the swing arm 94 will follow the slide rod 93. At this time, under the pull of the connecting rod 95, the swing arm 94 will deflect, and its top will drive the folding cylinder 96 to move in an arc towards the push block 7, further causing the folding cylinder 96 to push the left and right sides of the bottom of the carton, and causing the bottom of the carton to be pushed to the horizontal, thus completing the folding of the bottom of the carton.

[0026] See attached document Figure 6-7The folding cylinder 96 has a cavity 961 inside, and several negative pressure holes 962 communicating with the cavity 961 are opened at the top of the folding cylinder 96. The swing arm 94 has a negative pressure mechanism communicating with the cavity 961. When the folding cylinder 96 swings to make the unfolded carton bend inward, a negative pressure is formed in the cavity 961. The negative pressure mechanism works to form a negative pressure inside the cavity 961, which further forms a negative pressure in the negative pressure holes 962. At this time, the negative pressure holes 962 adsorb the left and right sides of the bottom of the carton, so as to prevent the bottom structure of the carton from deflecting into the inside of the carton during the folding process, which would cause glue gaps to appear at the bottom of the carton and affect the folding quality of the carton.

[0027] The negative pressure mechanism includes a piston chamber 941 located inside the swing arm 94 and communicating with the cavity 961. A piston block 942 is located inside the piston chamber 941, and a spring 943 is located between the piston block 942 and the piston chamber 941. A pull rope 944 is located at the bottom of the piston block 94 and passes through the swing arm 94. One end of the pull rope 944 passes through the swing arm 94 and is connected to the second positioning rod 91. When the top of the swing arm 94 swings towards the push block 7, the pull rope 944 will pull the piston block 942 to move in the piston chamber 941, further creating a negative pressure in the piston chamber 941 and the cavity 961. During the process of the folding cylinder 96 pushing the left and right sides of the bottom of the carton, the negative pressure hole 962 will attract the left and right sides of the bottom of the carton, preventing the bottom of the carton from folding inward into the inside of the carton and affecting subsequent work. Furthermore, to ensure that the swing arm 94 can drive the folding cylinder 96 to reset, a torsion spring 83 is provided between the swing arm 94 and the slide rod 93.

[0028] See attached document Figure 3 and Figure 8 The push block 7 has a frustum-shaped structure with a smaller top and a larger bottom, and a pair of screws 71 are threaded to the top of the push block 7. When folding the bottom of the lock-bottom carton, after the bottom of the carton is folded through the first folding mechanism and the second folding mechanism, the push block 7 continues to move upward. At this time, the screws 71 will push the side with the tongue at the bottom of the carton upward and insert it into the gap at the bottom of the carton, thus completing the folding work of the bottom of the lock-bottom carton. The push block 7 has a threaded hole that matches the adjustment of the screw 71. By adjusting the relative height of the screw 71, the bottom of different models of lock-bottom cartons can be folded. A pair of screws 71 are symmetrically arranged along the center line of the carton to be folded. By adjusting the height of one screw 71, it is easy to fold the bottom of the carton with different locking tongue positions.

[0029] See attached document Figure 9The folding plate 82 includes folding sections 821 for pushing the front and rear sides of the lower end of the carton after unfolding. The bottom of the folding section 821 is provided with a rotating shaft 822 rotatably connected to the first positioning rod 81. The bottom of the folding section 821 also has a first inclined section 823 and a second inclined section 824 located on the upper side of the push block 7. The first inclined section 823 is located between the folding section 821 and the second inclined section 824, and the first inclined section 823 has the same inclination direction as the push block 7 on that side, while the second inclined section 824 has the opposite inclination direction. The upward movement of the push block 7 will push the first inclined section 823... An inclined portion 823 further causes the folding plate 82 to rotate along the pivot 822, causing the folding portion 821 to push and fold the bottom of the carton. The push block 7 continues to move beyond the first inclined portion 823. At this time, the folding plate 82 returns to its original position under the action of the torsion spring 83. When the push block 7 moves downward, it will push the second inclined portion 824. At this time, the folding plate 82 rotates along the pivot 822. The first inclined portion 823 and the second inclined portion 824 will not hinder the push block 7 from moving downward. At this time, the push block 7 can return to its original position, which is convenient for folding the bottom of the next carton.

[0030] See attached document Figure 10 The second positioning rod 91 includes a pair of positioning cylinders 911 and a lead screw 912 threaded between the pair of positioning cylinders 911. The lead screw 912 is provided with a knob for easy rotation. When the knob is rotated, the lead screw 912 rotates within the two positioning cylinders 911, which further changes the overall height of the second positioning rod 91. At this time, the relative height of the folding cylinder 96 also changes, making it easier to fold different types of cartons.

[0031] See attached document Figure 3 The top relative height of the folding cylinder 96 is higher than the top relative height of the swing arm 94, which makes it easier for the negative pressure hole 962 to adsorb the bottom of the carton after the folding cylinder 96 contacts the bottom of the carton.

[0032] Working principle: The suction cup assembly 3 adsorbs the flat cardboard box, causing the flat cardboard to unfold into a box shape. The cylinder 6 drives the push block 7 to move upward, causing the oppositely arranged folding plate 82 to swing back and forth to the front and rear sides of the bottom of the unfolded cardboard box and bend it inward, making the front and rear sides of the bottom of the cardboard box tilt inward. Then, the oppositely arranged folding cylinder 96 swings left and right to the left and right sides of the bottom of the unfolded cardboard box and bends it inward to a horizontal position. At this time, the bottom of the cardboard box is folded. The entire folding process is realized by a single drive mechanism, which significantly simplifies the control complexity and reduces the stringent requirements for precision, thereby greatly reducing the possibility of device failure.

[0033] During the folding process of the carton, when the folding tube 96 rotates to make the unfolded carton bend inward, a negative pressure is formed in the cavity 961. At this time, the negative pressure hole 962 adsorbs the left and right sides of the bottom of the carton, so as to prevent the bottom structure of the carton from deflecting into the inside of the carton during the folding process, which would cause glue gaps to form in subsequent steps and affect the overall folding quality of the carton.

[0034] During the folding process of the carton, the pusher 7 drives the screw 71 to move upward, which in turn pushes the side of the carton with the tongue at the bottom of the carton to move upward, so that the locking tongue can be inserted into the gap at the bottom of the carton, making it easier to fold the lock-bottom carton.

[0035] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency cardboard folding device for cardboard processing, comprising a frame (1), a cardboard rack (2) for placing folded cardboard, a suction cup assembly (3), an upper guide plate (4), and a lower guide plate (5), wherein the upper guide plate (4) and the lower guide plate (5) are respectively arranged on the frame (1) to guide the cardboard adsorbed by the suction cup assembly (3) to fold along the fold seam, so that the flat cardboard unfolds into a box shape, characterized in that: The frame (1) is provided with a cylinder (6), and the top output end of the cylinder (6) is provided with a push block (7). The push block (7) is provided with a pair of first folding mechanisms symmetrically along its axis in one direction and a pair of second folding mechanisms symmetrically along its axis in the other direction. The first folding mechanism is used to fold the front and back sides of the bottom of the carton, and the second folding mechanism is used to fold the left and right sides of the bottom of the carton. The first folding mechanism includes a folding plate (82) that can swing back and forth, and the second folding mechanism includes a folding cylinder (96) that can swing left and right. As the pusher (7) moves vertically upward, the folding plates (82) that are positioned opposite each other swing back and forth to the front and rear sides of the bottom of the unfolded carton and bend inward. Then the folding tubes (96) that are positioned opposite each other swing left and right to the left and right sides of the bottom of the unfolded carton and bend inward to the horizontal. The first folding mechanism also includes a first positioning rod (81) fixed on the frame (1), the first positioning rod (81) being rotatably connected to the folding plate (82) and connected by a pair of torsion springs (83), the bottom of the folding plate (82) being located on the upper side of the push block (7); The second folding mechanism also includes a second positioning rod (91) fixed on the frame (1). The second positioning rod (91) is provided with a hollow block (92) for sliding rod (93). One end of the sliding rod (93) is located on the upper side of the push block (7), and the other end is rotatably connected to a swing arm (94). The two sides of the swing arm (94) are rotatably connected to connecting rods (95) connected to the second positioning rod (91), and the upper end of the swing arm (94) is connected to the folding cylinder (96). The folding tube (96) has a cavity (961) inside, and a number of negative pressure holes (962) communicating with the cavity (961) are opened at its top. The swing arm (94) is provided with a negative pressure mechanism that communicates with the cavity (961). When the folding cylinder (96) swings to make the unfolded carton bend inward, a negative pressure is formed in the cavity (961). The folding plate (82) includes a folding part (821) for pushing the unfolded carton to the front and rear sides of the lower end. The bottom of the folding part (821) is provided with a rotating shaft (822) that is rotatably connected to the first positioning rod (81). The bottom of the folding part (821) is also provided with a first inclined part (823) and a second inclined part (824) located on the upper side of the push block (7). The first inclined part (823) is located between the folding part (821) and the second inclined part (824). The first inclined part (823) is in the same inclination direction as the push block (7) on this side, and the second inclined part (824) is in the opposite inclination direction to the push block (7) on this side.

2. The high-efficiency carton folding device for carton processing as described in claim 1, characterized in that: The negative pressure mechanism includes a piston chamber (941) disposed in the swing arm (94) and communicating with the cavity (961). A piston block (942) is disposed in the piston chamber (941), and a spring (943) is disposed between the piston block (942) and the piston chamber (941). A pull rope (944) passing through the swing arm (94) is disposed at the bottom of the piston block (942), and one end of the pull rope (944) passing through the swing arm (94) is connected to the second positioning rod (91).

3. The high-efficiency cardboard folding device for cardboard box processing as described in claim 1, characterized in that: The push block (7) has a frustum-shaped structure with a smaller top and a larger bottom, and a pair of screws (71) are threadedly connected to the top of the push block (7). The push block (7) has a threaded hole for adjusting with the screws (71).

4. The high-efficiency carton folding device for carton processing as described in claim 3, characterized in that: The pair of screws (71) are arranged symmetrically on the left and right sides along the center line of the carton to be folded.

5. The high-efficiency carton folding device for carton processing as described in claim 1, characterized in that: The second positioning rod (91) includes a pair of positioning cylinders (911) and a lead screw (912) threaded between the pair of positioning cylinders (911), the lead screw (912) being provided with a knob for easy rotation.

6. The high-efficiency cardboard folding device for cardboard box processing as described in claim 1, characterized in that: The top relative height of the folding cylinder (96) is higher than the top relative height of the swing arm (94).

Images