A strapping belt feeding device used in a cardboard strapping machine

Abstract

The present invention discloses a strapping belt feeding device applied to a cardboard strapping machine, comprising a material tray mechanism for placing rolled strapping belts, a brake mechanism for stopping the material tray mechanism, an induction switching mechanism for sensing the end of the strapping belt and driving a knotting switching mechanism to perform a tensioning and knotting action, a knotting switching mechanism for performing a tensioning and knotting action on the end of one roll of strapping belt and the head end of another roll of strapping belt to achieve a head-to-end connection action of the two rolls of strapping belts, and a driving mechanism for driving the strapping belt to feed forward. The induction switching mechanism can be used to sense whether the strapping belt has been used up, and there is no need for manual attention to the use of the strapping belt, so the intelligence level of the equipment is improved. The knotting switching mechanism can also be used to achieve automatic connection of the two rolls of strapping belts, without manual shutdown operation, so as to maintain continuous action of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of cardboard bundling equipment, and in particular relates to a bundling belt feeding device applied to a cardboard bundling machine. Background Art

[0002] As we all know, cartons are used in huge quantities in the modern packaging industry. In the manufacturing process, carton manufacturers bind and bundle multiple pieces of cardboard to save storage space and facilitate the transportation, loading and unloading, and use of cartons. As the demand for cartons continues to increase, the traditional manual binding and bundling method can no longer meet the production needs of modern carton manufacturers. Therefore, various automatic cardboard bundling machines have appeared on the market. Their working principle is generally as follows: multiple pieces of cardboard to be bound and bundled are placed on the bundling station, and the bundling belt is continuously fed to the bundling station through the bundling belt feeding device. The bundling belt bundles multiple pieces of cardboard through the bundling device. However, the current bundling belt feeding device has the following problems:

[0003] 1. The rolled strapping tape is placed on the tray mechanism. There is space between the rolled strapping tape and the tray mechanism. The rolled strapping tape moves randomly on the tray mechanism, making it difficult to control the amount of strapping tape released.

[0004] 2. During the production process, the strapping tape often twists. The strapping tape in the bent state will easily cause marks on the upper and lower surfaces of the carton cardboard due to its small contact surface with the carton cardboard and unstable tension, affecting its appearance. In severe cases, it will also damage the carton cardboard, resulting in defective or waste products. At the same time, during production, the operator needs to pay attention to the amount of strapping tape used to avoid the equipment running empty after the strapping tape is used up. The operation is very complicated;

[0005] 3. During the production process, after the roll of strapping tape is used up, the machine needs to be stopped, and the next roll of strapping tape is manually tied to connect with the previous roll of strapping tape before the machine is started again. The strapping action cannot be performed continuously, and the machine needs to be stopped for connection each time the strapping tape is used up;

[0006] 4. During the transportation of the strapping tape, the driving mechanism will pause for a period of time according to the strapping action. When the driving mechanism pauses, the rolled strapping tape on the tray mechanism will continue to be fed forward due to inertia, resulting in messy transportation of the strapping tape. Summary of the invention

[0007] The technical problems to be solved by the present invention are that the rolled strapping belt cannot be clamped when placed on the material tray mechanism, the loaded strapping belt is twisted resulting in poor strapping quality, the strapping belt feeding cannot achieve automatic continuous action, and the strapping belt is transported in a messy manner.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] A strapping belt feeding device used in a cardboard strapping machine comprises a material tray mechanism for placing rolled strapping belts, a brake mechanism for stopping the material tray mechanism, an induction switching mechanism for sensing the end of the strapping belt and driving a knotting switching mechanism to tighten and knot, a knotting switching mechanism for tightening and knotting the end of one strapping belt with the head end of another strapping belt to achieve the head-end connection of the two strapping belts, and a driving mechanism for driving the strapping belt to feed forward, wherein the material tray mechanism, the induction switching mechanism, the knotting switching mechanism and the driving mechanism are arranged in sequence along the strapping belt conveying direction.

[0010] As a further improvement of the present invention, at least two material tray mechanisms are provided, and the material tray mechanism includes a rotating shaft connected to the brake mechanism at one end, two chucks inserted from the other end of the rotating shaft and arranged at intervals, and a tensioning mechanism arranged between the two chucks for clamping the inner side of the rolled strapping belt to prevent the rolled strapping belt from rotating at will. The two chucks are arranged at intervals to clamp the rolled strapping belt in place.

[0011] As a further improvement of the present invention, the tensioning mechanism includes two spaced apart mounting seats sleeved on the rotating shaft, and a plurality of tensioning strips which are movably connected to the two mounting seats at both ends. The plurality of tensioning strips are circumferentially arranged around the rotating shaft, and a spring connection is provided between each tensioning strip and the rotating shaft.

[0012] As a further improvement of the present invention, the brake mechanism includes a brake disc sleeved on the rotating shaft and fixed relative to the rotating shaft, a brake pad arranged on the outer periphery of the brake disc, and a brake telescopic cylinder connected to the brake pad for driving the brake pad to move.

[0013] As a further improvement of the present invention, the induction switching mechanism includes two parallel and relatively spaced belt-passing plates, and a knife switch arranged between the two belt-passing plates. A belt-passing groove for passing the strapping belt is provided on the opposite side of the two belt-passing plates. One end of the knife switch is connected to the belt-passing plate through a switch shaft, and the other end extends to the opening surface of the belt-passing groove. Two limit shafts are also provided between the two belt-passing plates for limiting the extreme positions of the two ends of the knife switch when it rotates.

[0014] As a further improvement of the present invention, the knotting switching mechanism includes a belt feeding channel for the previous roll of strapping tape to pass through, two hooks arranged on both sides of the belt feeding channel for placing the head end of the next roll of strapping tape into the pre-knotting position after the pre-knotting position is formed, and two clamping heads for clamping the extension lines at both ends of the pre-knotting position of the next roll of strapping tape, the two hooks are installed on an upper and lower telescopic cylinder and the up and down lifting movement is controlled by the upper and lower telescopic cylinders, and the two clamping heads control the left and right tightening action respectively through two left and right telescopic cylinders.

[0015] As a further improvement of the present invention, the driving mechanism includes two traction wheels for controlling the forward feeding of the strapping belt, the two traction wheels are arranged opposite to each other, one of the traction wheels is connected to the motor and is driven to rotate by the motor, and the other traction wheel is connected to the traction telescopic cylinder and the on and off of the strap feeding action is controlled by the telescopic action of the traction telescopic cylinder.

[0016] As a further improvement of the present invention, the strapping belt feeding device further includes a tension maintaining mechanism, and the tension maintaining mechanism is vertically arranged at the outlet end of the driving mechanism.

[0017] As a further improvement of the present invention, the tension maintaining mechanism includes a mounting frame with a groove-shaped structure, a tension roller arranged in the mounting frame, a guide rail for guiding the tension roller to slide up and down, and a fixed pulley for guiding the strap to pass through, the guide rail is fixedly mounted on the mounting frame, and the tension roller is movably connected to the guide rail.

[0018] The beneficial effects of the present invention are as follows: a material tray mechanism, an induction switching mechanism, a knotting switching mechanism, a driving mechanism and a tension holding mechanism are sequentially arranged in the strapping strap feeding device along the conveying direction of the strapping strap, so that when the strapping strap is fed through the strapping strap feeding device of the present invention, the strapping strap can be firmly clamped in the clamping position by the tensioning mechanism in the material tray mechanism, and the strapping strap will not randomly rotate to disrupt the feeding process. The induction switching mechanism can also be used to sense whether the strapping strap has been used up and a new strapping strap needs to be connected and the strapping strap is spread out flat, without manual attention to the use of the strapping strap, and the intelligence level of the equipment is improved. The knotting switching mechanism can also be used to realize automatic connection of two rolls of strapping straps, without manual shutdown operation, and the continuous action of the equipment is maintained. At the same time, a brake mechanism is connected to the material tray mechanism, so that when the driving mechanism stops, the material tray mechanism is synchronously stopped by the braking action of the brake mechanism, so as to ensure the normal feeding of the strapping strap. In addition, the tension holding mechanism is used to keep the strapping strap in a tensioned state during the feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 Schematic diagram of the overall structure of this embodiment;

[0021] Figure 2 for Figure 1 Right view of;

[0022] Figure 3 for Figure 1 Left view of

[0023] Figure 4 Schematic diagram of the structure of the material tray mechanism of this embodiment;

[0024] Figure 5 Schematic diagram of the structure of the brake mechanism of this embodiment;

[0025] Figure 6 is a three-dimensional diagram of the inductive switching mechanism of this embodiment;

[0026] Figure 7 This is a front view of the inductive switching mechanism of this embodiment;

[0027] Figure 8 for Figure 7 Sectional view of the middle section AA;

[0028] Fig. 9 This is a diagram of the internal installation structure of the induction switching mechanism of this embodiment;

[0029] Fig.10 is a three-dimensional diagram of the knotting switching mechanism of this embodiment;

[0030] Fig.11 This is a front view of the knotting switching mechanism of this embodiment;

[0031] Fig.12 Schematic diagram of the internal structure of the knotting switching mechanism of this embodiment;

[0032] Fig.13 is a three-dimensional diagram of the driving mechanism of this embodiment;

[0033] Fig.14 It is a front view of the driving mechanism of this embodiment;

[0034] Fig.15 is a three-dimensional diagram of the tension holding mechanism of this embodiment;

[0035] Fig.16 It is a schematic diagram of the wire feeding and conveying method of the strapping tape in this embodiment. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] Example:

[0038] like Figures 1 to 3As shown, this embodiment discloses a strapping belt feeding device used in a cardboard strapping machine, including a tray mechanism 1 for placing rolled strapping belts, a brake mechanism 2 for stopping the tray mechanism 1, a sensing switching mechanism 3 for sensing the end of the strapping belt and driving the knotting switching mechanism 4 to tighten and knot, a knotting switching mechanism 4 for tightening and knotting the end of one strapping belt with the head of another strapping belt to achieve the head-to-end connection of the two strapping belts, and a driving mechanism 5 for driving the strapping belt to feed forward, wherein the tray mechanism 1, the sensing switching mechanism 3, the knotting switching mechanism 4 and the driving mechanism 5 are arranged in sequence along the strapping belt conveying direction. In this embodiment, the strapping belt feeding device also includes a tension holding mechanism 6, which is vertically arranged at the outlet end of the driving mechanism 5. At the same time, the brake mechanism 2, the knotting switching mechanism 4, the inductive switching mechanism 3 and the driving mechanism 5 are all connected to the control device through the circuit to control the action of each mechanism. When in use, the bundled strapping tape is first put into the material tray mechanism 1, and the material tray mechanism 1 clamps the bundled strapping tape. Then, the head end of the strapping tape passes through the inductive switching mechanism 3, the knotting switching mechanism 4, the driving mechanism 5 and the tension holding mechanism 6 in turn and is input into the strapping device of the strapping machine. The end of the strapping tape forms a structure that can be sensed by the inductive switching mechanism 3, such as at the end of the strapping tape. A knot is tied at the end or a sensing point larger than the thickness of the strapping tape is formed. In addition, another roll of strapping tape is loaded on another material tray mechanism 1, and the head end of the other roll of strapping tape passes through the sensing switching mechanism 3 and is connected to the knotting switching mechanism 4. When the end of the strapping tape is conveyed to the sensing switching mechanism 3, the sensing switching mechanism 3 generates a sensing signal and sends it to the knotting switching mechanism 4 to drive it to perform a knotting action, so that the end of the previous strapping tape and the front end of the next strapping tape can be connected head to end, and there is no need to stop the machine for processing throughout the process. The degree of automation and intelligence of the present invention is improved.

[0039] As a preferred embodiment, Figure 4As shown, the material tray mechanism 1 is provided with two, and the material tray mechanism 1 includes a rotating shaft 11 connected to the brake mechanism 2 at one end, two chucks 12 inserted from the other end of the rotating shaft 11 and arranged at intervals, and a tensioning mechanism 13 arranged between the two chucks 12 for clamping the inner side of the rolled strapping belt to prevent the rolled strapping belt from rotating randomly, and the two chucks 12 are arranged at intervals to form a clamping position 14 for the rolled strapping belt. When the strapping tape is put in, an outer chuck 12 is removed from the rotating shaft 11, and the rolled strapping tape is placed in the clamping position 14. At the same time, the tensioning mechanism 13 firmly clamps the inner side of the strapping tape to prevent it from rotating relative to the rotating shaft 11, and then the removed chuck 12 is installed and clamped, and a bolt is locked into the outer side of the chuck 12 to axially fix the chuck 12. At the same time, a limiting groove is opened on the chuck 12, and a limiting hole is opened on the rotating shaft 11. The axial fixation of the chuck 12 is achieved by inserting the limiting pin into the limiting groove and the limiting hole. In addition, a belt stop roller is arranged between the two material tray mechanisms 1, and the two rolls of strapping tape are separated by the blocking effect of the belt stop roller to prevent interference and winding between each other, and the arrangement of the two material tray mechanisms 1 is staggered from the vertical direction, and the strapping tape on one of the material tray mechanisms 1 is introduced into the induction switching mechanism 3 from the inner side of the belt stop roller, and the strapping tape on the other material tray mechanism 1 is introduced into the knotting switching mechanism 4 from the outer side of the belt stop roller through the induction switching mechanism 3.

[0040] As a preferred embodiment, Figure 4 As shown, the tensioning mechanism 13 includes two spaced mounting seats 131 sleeved on the rotating shaft 11, and a plurality of tensioning strips 132 movably clamped on the two mounting seats 131 at both ends. The plurality of tensioning strips 132 are circumferentially arranged around the rotating shaft 11, and a spring 133 is provided between each tensioning strip 132 and the rotating shaft 11. When the rolled strapping tape is loaded, the tensioning strip 132 is contracted toward the rotating shaft 11, and the spring 133 is in a compressed state. After the rolled strapping tape is loaded, the spring 133 rebounds under the action of the elastic force, so that the tensioning strip 132 expands outward to clamp the strapping tape. In this embodiment, there are four tension strips 132, which are evenly arranged around the rotating shaft 11. An open groove is opened on the mounting seat 131 for clamping the tension strip 132 and guiding the movement of the tension strip 132. The tension strip 132 can move inward and outward along the open groove. At the same time, the end of the tension strip 132 is an inclined structure with a small outer end and a large middle. This embodiment adopts a trapezoidal structure of the tension strip 132, and the inclined structure can facilitate the rapid loading of the rolled strapping tape.

[0041] In addition, the material tray mechanism 1 can also be provided in plurality, so that more rolled strapping tapes can be installed on the material tray mechanism 1 at one time, so that the strapping tape feeding device can work continuously for a longer time, and the operator does not need to pay attention to the remaining amount of strapping tapes for a long time, and frequently discharge the strapping tapes. The operator only needs to put in the daily usage of the rolled strapping tapes at one time, and no longer needs to check the usage of the strapping tapes, so that one operator can control multiple cardboard strapping machines, greatly saving the labor cost of equipment operation. At the same time, when multiple material tray mechanisms 1 are provided, compared with the strapping tape feeding device with two material tray mechanisms 1, each additional material tray mechanism 1 can be provided with a corresponding additional brake mechanism 2 and knot switching mechanism 4.

[0042] As a preferred embodiment, Figure 5 As shown, the brake mechanism 2 includes a brake disc 21 which is sleeved on the rotating shaft 11 and fixed relatively to the rotating shaft 11, a brake pad 22 arranged on the outer periphery of the brake disc 21, and a brake telescopic cylinder 23 connected to the brake pad 22 for driving the brake pad 22 to move. When the brake telescopic cylinder 23 is extended, the brake pad 22 contacts the brake disc 21, and the material tray mechanism 1 is in a stopped state. When the brake telescopic cylinder 23 is retracted, the brake pad 22 is separated from the brake disc 21, and the stop of the material tray mechanism 1 is released. At the same time, the brake telescopic cylinder 23 of this embodiment repels the traction telescopic cylinder 53. When the traction telescopic cylinder 53 is extended, the brake telescopic cylinder 23 is retracted. When the traction telescopic cylinder 53 is retracted, the brake telescopic cylinder 23 is extended.

[0043] As a preferred embodiment, Figures 6 to 9 As shown, the induction switching mechanism 3 includes two parallel and relatively spaced belt-passing plates 31, a knife switch 32 arranged between the two belt-passing plates 31, and a belt-passing groove 33 for the strapping belt to pass through is opened on the opposite side of the two belt-passing plates 31. One end of the knife switch 32 is connected to the belt-passing plate 31 through a switch shaft 34, and the other end extends to the opening surface of the belt-passing groove 33. Two limit shafts 35 are also provided between the two belt-passing plates 31 for limiting the extreme positions of the two ends of the knife switch 32 when it rotates. When the strapping belt passes through the induction switching mechanism 3, the strapping belt will be unfolded flat when passing through the belt slot 33, so that the bundling quality of the cardboard is guaranteed, and the end of the strapping belt enters the belt slot 33, which will trigger the knife switch 32 to flip upward, thereby sending an induction signal outward, so that the knotting switching mechanism 4 is activated, and the end of the strapping belt continues to be transported forward. The end of the strapping belt pushes the knife switch 32 out of the belt slot 33, the strapping belt passes through the belt slot 33, and then the knife switch 32 returns to the belt slot 33 under the action of gravity.

[0044] As a preferred embodiment, Figures 10 to 12As shown, the knotting switching mechanism 4 includes a tape feeding channel 41 for the previous roll of strapping tape to pass through, two hooks 42 arranged on both sides of the tape feeding channel 41 for placing the head end of the next roll of strapping tape into the pre-knotting position after the pre-knotting position is formed, and two clamping heads 43 for clamping the extension lines at both ends of the pre-knotting position of the next roll of strapping tape, the two hooks 42 are installed on an upper and lower telescopic cylinder 44 and the upper and lower telescopic cylinders 44 control the up and down lifting movement, the two clamping heads 43 respectively control the left and right tensioning action through two left and right telescopic cylinders 45, and the clamping heads 43 control the clamping and loosening action of the extension lines at both ends of the pre-knotting position of the next roll of strapping tape through the front and rear telescopic cylinders. When the end of the previous roll of strapping enters the induction switching mechanism 3 and triggers an induction signal, the knotting switching mechanism 4 inputs an action signal, the upper and lower telescopic cylinders 44 drive the two hooks 42 to move downward, and the left and right telescopic cylinders 45 respectively drive the two clamping heads 43 to move outward, thereby tightening the pre-knotting position of the next roll of strapping, so that the end of the previous roll of strapping is connected to the head end of the next roll of strapping, and then the clamping head 43 loosens the extension section of the pre-knotting position of the next roll of strapping, so that the next roll of strapping can be fed forward. The previous roll of strapping described in this embodiment refers to the strapping unwound by the current device, and the next roll of strapping refers to the strapping that is connected to the end of the previous roll of strapping to form a continuous unwound strapping.

[0045] As a preferred embodiment, Fig.13 and Fig.14 As shown, the driving mechanism 5 includes two traction wheels 51 for controlling the forward feeding of the strapping belt, the two traction wheels 51 are arranged opposite to each other, one of the traction wheels 51 is connected to the motor 52 and is driven to rotate by the motor 52, and the other traction wheel 51 is connected to the traction telescopic cylinder 53 and the on and off of the strapping action is controlled by the telescopic action of the traction telescopic cylinder 53. When the traction telescopic cylinder 53 extends, the traction wheel 51 connected to the traction telescopic cylinder 53 moves toward the traction wheel 51 connected to the motor 52, and the strapping belt is transported under the traction action of the two traction wheels 51, and when the traction telescopic cylinder 53 retracts, the traction action stops.

[0046] As a preferred embodiment, Fig.16 As shown, the tension maintaining mechanism 6 includes a mounting frame 61 with a groove-shaped structure, a tension roller 62 arranged in the mounting frame 61, a guide rail 63 for guiding the tension roller 62 to slide up and down, and a fixed pulley 64 for guiding the strapping belt to pass through. The guide rail 63 is fixedly installed on the mounting frame 61, and the tension roller 62 is movably connected to the guide rail 63.

[0047] The working principle of the strapping belt feeding device of this embodiment is as follows: before starting the machine, the operator puts the rolled strapping belt into the material tray mechanism 1 one by one, and passes the first roll of strapping belt through the belt passing slot 33 of the induction switching mechanism 3, and passes through the knotting switching mechanism 4, the driving mechanism 5 and the tension holding mechanism 6 in turn, and is led out from the tension holding mechanism 6 to the strapping device of the strapping machine, and then the second roll of strapping belt passes through the belt passing slot 33 of the induction switching mechanism 3 and is led into the knotting switching mechanism 4, the head end of the second roll of strapping belt wraps around the first roll of strapping belt to form a pre-knotting position, the pre-knotting position is hooked on the two hooks 42 of the knotting switching mechanism 4, and then the clamping head 43 is driven to extend, and the extension wires at both ends of the pre-knotting position are respectively placed in the two clamping heads 43, and the clamping head 43 is retracted to clamp the strapping belt, and the remaining third bundle, fourth bundle...nth bundle The steps of leading the straps are the same as those of the second roll of strapping belt, and then the strapping belt feeding device is started to work, the motor 52 rotates, and the pulling telescopic cylinder 53 extends , the strapping belt is continuously conveyed forward. When the strapping mechanism is in action and the strapping belt feeding device needs to stop feeding, the traction telescopic cylinder 53 is retracted, and the brake telescopic cylinder 23 of the brake mechanism 2 is extended to stop the material tray mechanism 1; when the strapping belt feeding device needs to continue to feed forward, the traction telescopic cylinder 53 is extended and the brake telescopic cylinder 23 is retracted; when a roll of strapping belt in the strapping belt feeding device is used up, the induction knot at the end of the strapping belt enters the belt slot 33. Due to its large cross-sectional thickness, the knife switch 32 will be lifted up and flipped upward when passing through the belt slot 33, thereby triggering the action of the knotting switching mechanism 4. First, the upper and lower telescopic cylinders 44 drive the two hooks 42 to move downward, and the two hooks 42 are separated from the pre-knotting position. Then, the two left and right telescopic cylinders 45 respectively drive the two clamping heads 43 to move in the direction of distance expansion, so that the pre-knotting position is tightened and knotted, completing the head and end connection of the two rolls of strapping belts, and then the two clamping heads 43 are extended to loosen the strapping belt, and the strapping belt can continue to be fed.

[0048] In order to better understand this technical document, the strapping belt conveying method of this embodiment is as follows: Fig.16 As shown, the first roll of the strapping tape is numbered 7, the second roll of the strapping tape is numbered 8, the pre-knotting position is numbered 9, and the end sensing structure of the strapping tape is numbered 10.

[0049] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means belongs to the protection scope of the present invention.

Claims

1. A strapping belt feeding device used in a cardboard strapping machine, characterized in that: The invention comprises a tray mechanism (1) for placing rolled strapping tape, a brake mechanism (2) for stopping the tray mechanism (1), a sensing switching mechanism (3) for sensing the end of the strapping tape and driving a knotting switching mechanism (4) to perform a tightening and knotting action, a knotting switching mechanism (4) for tightening and knotting the end of one strapping tape with the beginning of another strapping tape to achieve a head-to-end connection of the two strapping tapes, and a driving mechanism (5) for driving the strapping tape to feed forward, wherein the tray mechanism (1), the sensing switching mechanism (3), the knotting switching mechanism (4) and the driving mechanism (5) are arranged in sequence along the strapping tape conveying direction; The inductive switching mechanism (3) comprises two parallel and spaced-apart tape-passing plates (31), and a knife switch (32) arranged between the two tape-passing plates (31); a tape-passing slot (33) for passing the strapping tape is provided on opposite sides of the two tape-passing plates (31); one end of the knife switch (32) is connected to the tape-passing plate (31) via a switch shaft (34), and the other end extends to the opening surface of the tape-passing slot (33); and two limit shafts (35) for limiting the extreme positions of the two ends of the knife switch (32) when the knife switch (32) rotates are also provided between the two tape-passing plates (31); The knotting switching mechanism (4) comprises a belt feeding channel (41) for a previous roll of strapping belt to pass through, two hooks (42) arranged on both sides of the belt feeding channel (41) for placing the head end of the next roll of strapping belt into the pre-knotting position after the pre-knotting position is formed, and two clamping heads (43) for clamping the extension wires at both ends of the pre-knotting position of the next roll of strapping belt, the two hooks (42) being mounted on an upper and lower telescopic cylinder (44) and controlled to move up and down by the upper and lower telescopic cylinder (44), and the two clamping heads (43) respectively controlling the left and right tensioning actions by two left and right telescopic cylinders (45).

2. The strapping tape feeding device used in a cardboard strapping machine according to claim 1, characterized in that: The material tray mechanism (1) is provided with at least two, and the material tray mechanism (1) comprises a rotating shaft (11) connected to the brake mechanism (2) at one end, two chucks (12) inserted into the other end of the rotating shaft (11) and arranged at intervals, and a tensioning mechanism (13) arranged between the two chucks (12) for clamping the inner side of the rolled strapping belt to prevent the rolled strapping belt from rotating at will, and the two chucks (12) are arranged at intervals to form a clamping position (14) for clamping the rolled strapping belt.

3. The strapping belt feeding device used in a cardboard strapping machine according to claim 2, characterized in that: The tensioning mechanism (13) comprises two spaced apart mounting seats (131) sleeved on the rotating shaft (11), and a plurality of tensioning strips (132) movably clamped at both ends on the two mounting seats (131), the plurality of tensioning strips (132) being arranged circumferentially around the rotating shaft (11), and a spring (133) being provided between each tensioning strip (132) and the rotating shaft (11).

4. The strapping tape feeding device used in a cardboard strapping machine according to claim 2, characterized in that: The brake mechanism (2) comprises a brake disc (21) sleeved on the rotating shaft (11) and fixed relative to the rotating shaft (11), a brake pad (22) arranged on the outer periphery of the brake disc (21), and a brake telescopic cylinder (23) connected to the brake pad (22) for driving the brake pad (22) to move.

5. The strapping belt feeding device used in a cardboard strapping machine according to claim 1, characterized in that: The driving mechanism (5) comprises two traction wheels (51) for controlling the forward feeding of the strapping belt, the two traction wheels (51) being arranged opposite to each other, one of the traction wheels (51) being connected to a motor (52) and driven to rotate by the motor (52), and the other traction wheel (51) being connected to a traction telescopic cylinder (53) and controlling the on and off of the strap feeding action by the telescopic action of the traction telescopic cylinder (53).

6. The strapping belt feeding device used in a cardboard strapping machine according to claim 1, characterized in that: The strapping belt feeding device further comprises a tension maintaining mechanism (6), wherein the tension maintaining mechanism (6) is vertically arranged at the outlet end of the driving mechanism (5).

7. The strapping belt feeding device used in a cardboard strapping machine according to claim 6, characterized in that: The tension holding mechanism (6) comprises a mounting frame (61) of a groove-shaped structure, a tension roller (62) arranged in the mounting frame (61), a guide rail (63) for guiding the tension roller (62) to slide up and down, and a fixed pulley (64) for guiding the strapping belt to pass through, wherein the guide rail (63) is fixedly mounted on the mounting frame (61), and the tension roller (62) is movably connected to the guide rail (63).

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