Plastic bag strapping machine with lengthened rope head

Abstract

The utility model discloses a plastic bag strapping machine with a lengthened rope head, which comprises a beak knotter and a bracket, a machine head of the beak knotter is connected onto the bracket, one side of the machine head or the bracket is provided with an external rope pusher, the external rope pusher comprises a pushing claw and a pushing mechanism, the pushing claw is connected onto the pushing mechanism, and the pushing claw is connected onto the bracket. The pushing mechanism is a cam assembly or an external driving part and is arranged on the side face of the machine head or the bracket, the length of the rope head is increased by increasing the relative distance between the pressing buckle and the beak and between the rope cutter and the beak, and the external rope pusher is adopted to adapt to the stroke of the rope head. The rope pusher is simple in structure, can be produced under the conditions that the size of a machine head of the beak knotter does not need to be changed and a machine head mold does not need to be additionally developed, avoids the phenomenon that an existing rope pusher is prone to deformation and clamping, and is convenient to maintain and lubricate.

Description

Technical Field

[0001] The utility model relates to a plastic bag strapping machine with an extended rope end. Background Art

[0002] The utility model relates to a plastic bag strapping machine with an extended rope end, which uses a bird's beak knotter to strap the plastic bags.

[0003] Authorization announcement number CN221719031U discloses a knotted plastic bag folding and bundling machine (hereinafter referred to as prior art 1), which includes a frame, a folding device, and a bird's beak knotter. Authorization announcement number CN217779046U discloses a courier bag bundling device (hereinafter referred to as prior art 2), whose bundling mechanism mainly includes a bundling placement plate (support plate), and a bundling rope knotter is provided below the placement plate. The bundling rope knotter is the bird's beak knotter in prior art 1, and also includes a pressing plate (pressing plate), a rope supply rod (winding rod), etc. Application publication number CN117885950A discloses a plastic bag packaging bundling device (hereinafter referred to as prior art 3), whose bundling and knotting mechanism mainly includes a knotting conveying rod (winding rod) and a knotting machine core (machine head), a bag discharge pressing plate (pressing plate) and a discharge platform (support plate).

[0004] In the above-mentioned prior art for bundling plastic bags, the bird's beak knotter used is a mature prior art, mainly comprising a machine head, a bird's beak, a pressure buckle, a rope cutter, a rope pusher, a rope shaving plate, a cam, a transmission shaft, and a motor. Multiple cams are arranged on the same transmission shaft, one end of the transmission shaft is connected to the motor, and when the motor rotates, the bird's beak cam drives the bird's beak to swing back and forth. Under the drive of the linkage shaft, the rope cutter swings back and forth to cut the binding rope. The rope picking plate cam can drive the wire picking plate to move up and down, and the wire pushing plate cam can push the wire pushing plate to move left and right. The pressure buckle can clamp the two ends of the binding rope. The rope pusher pushes the binding rope into one side of the bird's beak at a position between the pressure buckle and the bird's beak. Then the bird's beak swings and rotates under the drive of the incomplete gear disc to wrap the binding rope around the bird's beak. Then the bird's beak opens to bite the binding rope. Then, under the joint action of the wire picking plate and the bird's beak, a joint is formed. Then the rope cutter swings to cut a strand of binding rope at a position between the bird's beak and the pressure buckle. When using a plastic bag, the user pinches the two rope ends with his hands and pulls hard, and the binding rope will be untied.

[0005] Although the above existing designs have automated the bundling of plastic bags and can be achieved using existing bird's beak knotters, they are easily available on the market, are inexpensive, have low manufacturing costs, and are easily accepted by users in terms of price, these bundling machines have not been recognized by the market.

[0006] We conducted extensive market research and field studies on the market for plastic bag strapping machines and discovered several issues with existing machines. First, because the distance between the buckle and the beak is relatively small, after the knot is tied, the rope cutter cuts the rope between the buckle and the beak, leaving the rope end short. This type of knotter has advantages for bundling other objects or in other industries. First, it saves rope length, reducing bundling costs. Second, the shorter rope end is more aesthetically pleasing. However, when applied to plastic bag strapping, it presents a problem: plastic bags are often folded together in bundles of dozens or even hundreds. Each time a bag is used, the rope must be untied and then re-tied with the original rope. Untying the rope is difficult because the end is so short, only about 1.5 cm, requiring pinching and pulling with the tips of two fingers. Furthermore, the rope ends are very smooth plastic tape, making it difficult to untie. After untying the tying rope, the remaining plastic bags will be too short when tied with the original tying rope, making it difficult to tie them again manually. When tying plastic bags manually in the traditional way, the tying rope is usually cut to a length of more than 45 cm. This way, when using it, it can be easily untied by holding the rope end with your hand. Because the length of the tying rope is long enough, the remaining plastic bags can also be conveniently tied with the original tying rope. Secondly, the rope pusher of the traditional bird's beak knotter is set on the bottom of the machine head. The space at the bottom of the machine head is narrow and long. Due to space limitations, the rope pusher is thin and long. The cam has to overcome the tension of the reset spring while driving the rope pusher to push the rope. It is easy to bend and deform and get stuck during work, resulting in unstable knotting work. In addition, because it is hidden inside the bottom of the machine head, maintenance and lubrication are inconvenient.

[0007] Based on market research and existing technical issues, we attempted to address this by increasing the relative distance between the buckle and the bird's beak, and consequently increasing the length and stroke of the rope pusher. This required redesigning the bird's beak knotter's nose. However, the nose base of the bird's beak knotter is a precision casting, a standard product, or in other words, a widely used and established market, readily available and inexpensive. Redesigning the nose base and making the mold in-house would be a significant expense, and the production of such precision castings would require at least tens of thousands of pieces at a time. Casting manufacturers generally wouldn't accept smaller quantities, and even if they did, the cost would be prohibitive. Summary of the Invention

[0008] In order to solve the deficiencies in the prior art, the technical problem to be solved by the present invention is: on the basis of adopting the existing bird's beak knotter head, a means of lengthening the relative distance between the pressure buckle and the bird's beak is adopted, and an external rope pusher is designed to adapt to it, thereby providing a plastic bag strapping machine with an extended rope head.

[0009] In order to achieve the above technical objectives, the technical solution of the utility model is: a plastic bag strapping machine with an extended rope end, including a bird's beak knotter, the bird's beak knotter includes a machine head, a rope shaving plate, a bird's beak, a buckle, a rope cutter, a motor, and a transmission shaft, and is characterized in that: a bracket is also provided, the machine head is connected to the bracket, the transmission shaft is rotatably set on the bracket, the transmission shaft is connected to the motor, and an external rope pusher is also provided on one side of the machine head or on the bracket, the external rope pusher includes a pushing claw and a pushing mechanism, the pushing claw is connected to the pushing mechanism, and the pushing mechanism is a cam assembly or an external driving component, which is arranged on the side of the machine head or on the bracket.

[0010] The head of the bird's beak knotter is a casting, similar to the body, with precise mounting holes and mounting positions processed on it. The bird's beak, rope shaving plate, linkage shaft, rope supporting plate and other components are all included in the head, and also include a press buckle and rope cutter.

[0011] As a preferred technical solution, the buckle and rope cutter are mounted on the bracket or connected to the machine head via a connector. These two optional connection methods conveniently increase the relative distance between the buckle and rope cutter and the beak, and are structurally simple. Furthermore, these two connection methods are equivalent in parallel. One method is to connect the buckle and rope cutter to one end of a connector, and the other end of the connector to the machine head. The connector can be a connecting plate, a casting, or other shapes, and can be connected using either welding or bolts.

[0012] The external rope pusher refers to a rope pusher (push claw) whose push mechanism is located on one side of the machine head or on the bracket. This avoids the limited internal space of the bird's beak knotter and accommodates the technical problem of increasing the rope pusher's travel when the distance between the buckle and the bird's beak is increased. The push mechanism can be located on the left or right side, front or back side of the machine head, or on the bracket.

[0013] The pushing mechanism is a cam assembly or an external driving component.

[0014] As a preferred technical solution, the cam assembly includes a pushing cam, a guide rail, a slider, a roller, and a return spring. The pushing cam is arranged on the transmission shaft, and the slider is connected to one side of the machine head or the bracket.

[0015] This design can reduce the friction during the reciprocating movement of the rope pusher. Compared with the traditional rope pusher, the rolling friction between the guide rail and the slider has less resistance, strong bending resistance, high guidance, and is easy to lubricate and maintain.

[0016] The guide rail can be replaced by an optical shaft, square steel or angle steel, and the slider can be replaced by a linear bearing, a sliding sleeve, a dovetail groove, etc., which all have equivalent technical features.

[0017] For example, the slider can be replaced by two linear bearings or bushings, and the guide rail can be replaced by two optical shafts, which are slidably arranged in the linear bearings or bushings, one end of the two optical shafts is connected to the push claws, and the other end of the two optical shafts is connected to the rollers.

[0018] The roller is a roller follower, and the cam mechanism also includes a flat-bottom follower, a pointed-top follower, etc. Therefore, the roller can also be replaced by other means such as a sliding block, a square block, an arc block, etc.

[0019] As another embodiment of the pushing mechanism, the external driving part is a cylinder or an electric slide. The external driving part means that an additional driving mechanism is provided, which refers to a power mechanism added in addition to the original motor of the bird's beak knotter. The cylinder includes a double-rod cylinder or a guide rod cylinder, etc., or an electric cylinder; the electric slide is a mechanism that converts the rotational motion of the motor into linear motion, also called a linear module, including a ball screw module driven by a motor, or a gear rack module composed of a motor and a gear rack, or a belt drive module composed of a synchronous wheel, a synchronous belt, a guide rail, etc., and there are many implementation methods.

[0020] In the technical solution of the present invention, a winding rod, a pressure plate, and a support plate are also provided on the bracket. Since the technical contents such as the winding rod, the pressure plate, and the support plate belong to the prior art and have been disclosed in the prior art 1, the prior art 2, and the prior art 3, there is no need to describe them in detail. The traditional bird's beak knotter generally also includes a rope support plate, which is used to lift the lower strand of the tying rope after winding and put it together with the upper strand of the tying rope. However, when the bird's beak knotter is applied to the tying of plastic bags, due to the shape of the plastic bag and the characteristics of the support plate and the corresponding winding rod, especially when the relative distance between the buckle and the bird's beak is increased, the angle of the lower strand of the tying rope changes, and can basically be put together when the push claw is pushed in, so the support plate can be omitted.

[0021] The practical problem addressed by this utility model is to increase the length of the rope end by increasing the relative distance between the pressure buckle and rope cutter and the bird's beak to meet market demand for plastic bag tying. To accommodate this change, an external rope pusher has been designed. The winding mechanism for wrapping the tying rope around the plastic bag, the pressure plate, support plate, winding rod mechanism for securing the plastic bag, and other components of the bird's beak knotter are all known techniques, and relevant prior art literature is available for reference. This is readily achievable by those skilled in the art without requiring any inventive effort, so a detailed description is unnecessary.

[0022] The beneficial effects of the present invention are as follows: First, the length of the rope head can be lengthened by increasing the relative distance between the pressure buckle and the bird's beak. After the rope head is lengthened, it is not only easy to pinch the rope head, but also easy to hold, which makes it easy to untie the binding rope; because the rope head is long, the total length of the binding rope is correspondingly lengthened. After the plastic bags are used, the remaining plastic bags can be conveniently tied with knots using the original binding rope. Second, after adopting an external rope pusher, its pushing claw not only realizes the function and effect of the rope pushing plate in the existing technical solution, but also has a guiding and limiting function. Moreover, after being externalized, it is not restricted by the internal space of the machine head, which can increase the strength of the rope pusher, avoid the phenomenon that the rope pusher is easily stuck due to bending and deformation during the reciprocating movement, and is also convenient for lubrication and maintenance. Third, the present invention can use the existing bird's beak knotter machine head, saving manufacturing costs, and can achieve the technical purpose of lengthening the rope head without the need to develop a separate mold. Fourth, the formation of the technical solution of this utility model has undergone a long-term technical research and development process of market field research and continuous summary of experience. Problems were discovered and technical problems were solved after in-depth market research. It is an innovative technical solution that integrates scientific research, market research, and scientific design. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structural principle of the first embodiment from the front and side;

[0024] Figure 2 This is a schematic top view of the structural principle of the first embodiment;

[0025] Figure 3 It is a rear schematic diagram of the structural principle of embodiment 1;

[0026] Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 This is a schematic diagram of the working steps and working principle of Example 1;

[0027] Figure 8 This is a schematic diagram of the bundling effect of plastic bags;

[0028] Figure 9Schematic diagram of the structural principle of embodiment 2;

[0029] Figure 10 It is a schematic diagram of the structural principle of embodiment three.

[0030] In the figure: 1 - bird's beak knotter; 11 - machine head; 12 - bird's beak; 121 - bird's beak cam; 122 - incomplete gear plate; 123 - umbrella gear; 124 - rope shaving cam; 13 - buckle; 14 - rope cutter; 15 - transmission shaft; 16 - motor; 17 - linkage shaft; 18 - rope shaving plate; 2 - bracket; 3 - connector; 4 - external rope pusher; 41 - -Push claw; 42--Push mechanism; 421--Cam assembly; 4211--Push cam; 4212--Slider; 4213--Guide rail; 4214--Roller; 4215--Reset spring; 422--External drive component; 4221--Electric slide; 423--Proximity switch; 5--Binding rope; 51--Rope end; 6--Winding rod; 61--Pressure plate; 7--Plastic bag. DETAILED DESCRIPTION

[0031] In order to fully disclose the present invention, the following three embodiments are used in conjunction with the accompanying drawings to specifically describe the technical solution of the present invention. Figure 1 The left side is the left side of the utility model, Figure 1 The right side is exactly the right side described in the present invention.

[0032] Example 1, as Figures 1 to 8 As shown: the buckle 13 and the rope cutter 14 of the embodiment 1 are connected to the machine head 11 by the connecting member 3, the push claw 41 is connected to the pushing mechanism 42, and the external rope pusher 4 includes the push claw 41 and the pushing mechanism 42, and the pushing mechanism 42 is a cam assembly 421. Figure 1 、 Figure 2 、 Figure 3As shown: a square frame is set as a bracket 2, and the head 11 of the bird's beak knotter 1 is installed at the right front side of the bracket 2. The buckle 13 and the rope cutter 14 on the head 11 are removed, and then a plate-shaped body is set as the connecting member 3. The length of the rope head 51 is lengthened as needed to move the distance between the buckle 13 and the rope cutter 14 and determine the left and right lengths of the connecting member 3. The right end of the connecting member 3 is installed on the head 11, and the buckle 13 and the rope cutter 14 are installed below the left end of the connecting member 3. A transmission shaft 15 is installed in the front and rear directions of the bearing on the bracket 2 at the lower right side of the head 11, and a motor 16 is installed at the rear end position corresponding to the transmission shaft 15. The motor 16 is a reduction motor or a stepper motor. Enter the motor and connect the motor 16 to the transmission shaft 15. A bird's beak cam 121 and an incomplete toothed disc 122 are respectively installed at the middle position of the transmission shaft 15. It is also necessary to install a rope-picking plate cam 18 that drives the rope-picking plate to move up and down. Adjust the position of the bird's beak cam 121 so that it corresponds to the swing arm of the bird's beak 12. When the bird's beak cam 121 rotates with the transmission shaft 15 and contacts the swing arm of the bird's beak 12, it can drive the bird's beak 12 to swing in the front and back directions; adjust the angle of the incomplete toothed disc 122 so that it meshes with the gear (omitted) below the bird's beak 12. When the incomplete toothed disc 122 rotates to mesh with the gear of the bird's beak 12, it can drive the two bevel gears 123 to rotate, causing the bird's beak 12 to rotate intermittently. , and the bird's beak 12 can open and close during the rotation; a linkage shaft 17 is set, which is actually to lengthen the linkage shaft of the original bird's beak knotter 1, and then the bird's beak 12 is connected to the rope cutter 14 with the linkage shaft 17. When the bird's beak 112 swings back and forth, the rope cutter 14 also swings back and forth at the same time; a pushing cam 4211 is installed at the position of the transmission shaft 15 on the front side of the bracket 2, a slider 4212 is installed at the front side of the bracket 2, a guide rail 4213 is slidably installed on the slider 4212, a push claw 41 is installed at the left end of the guide rail 4213, and a return spring 4215 is connected to the right end of the guide rail 4213. The right end of the return spring 4215 is connected to the bracket On the frame 2, a roller 4214 is installed on the front side of the guide rail 4213. When the maximum radius profile curve position of the pushing cam 4211 contacts the roller 4214, the pushing claw 41 can be pushed to the left to the left dead center. At this time, the pushing claw 41 is in a position that does not affect the rotation of the bird's beak 12. When the minimum radius profile curve of the pushing cam 4211 turns to contact the roller 4214, the pushing claw 41 can be moved to the right to the right dead center under the elastic tension of the reset spring 4215, that is, the pushing claw 41 can be in the right side position of the bird's beak 12; a rope picking plate 18 is also installed on the machine head 11, and a rope shaving cam 124 is installed on the position of the transmission shaft 15 corresponding to the follower claw below the rope shaving plate 18.In addition, the bird's beak knotter 1 is also provided with other components such as a bird's beak gear. Since the bird's beak knotter 1 belongs to the existing technology and is equipped with the whole set of bird's beak knotter 1 when purchased, it will not be described in detail; as for the pressure plate 61 and winding rod 6 for fixing the plastic bag 7, they belong to the existing technology and have been disclosed in the existing technologies 1, 2, and 3, and there is no need to repeat them here.

[0033] The working process of the embodiment 1 is as follows: Figure 4 ,to Figure 8 As shown, when the plastic bag 7 is placed in the strapping working position, about half of the plastic bag 7 is fixedly pressed by the pressing plate 61 on the support plate 62 above the machine head 11, forming the following from a top view. Figure 4 At this time, one end of the tying rope 5 is clamped at the lower side of the buckle 13, and then the winding rod 6 is driven by its up and down driving mechanism and the left and right driving mechanism to wrap the tying rope 5 to the right from the bottom and top of the plastic bag 7 around the buckle 13, and then the winding rod 6 continues to pull the tying rope 5 to the right to the right position, forming a state as seen from a top view. Figure 5 After that, the motor 16 starts to rotate and drives the push cam 4211 to rotate. When the push cam 4211 rotates to the small radius profile curve position until it contacts the roller 4214, the push claw 41 gradually moves to the right along the guide rail 4213 under the elastic pull of the return spring 4215. In the process of moving to the right, the push claw 41 pushes the upper and lower tying ropes 5 to the right side of the bird's beak 12, forming a Figure 6 As shown in the figure (the bird's beak 12 has swung to the front position and does not affect the advancement of the push claw 41, so the bird's beak 12 is not shown in the figure); as the transmission shaft 15 continues to rotate, when the bird's beak cam 121 contacts the swing arm of the bird's beak, the swing arm is driven to swing the bird's beak 12 backward and extend from between the upper and lower claws of the push claw 41. The bird's beak 12 after swinging backward blocks the left side of the two tying ropes 5, forming a Figure 7The state shown; as the push cam 4211 rotates, when the position of the small radius profile curve of the push cam 4211 contacts the roller 4214, the guide rail 4213 and the push claw 41 move to the left and reset to the initial position; then, the incomplete toothed disc 122 mounted on the transmission shaft 15 begins to mesh with the bird's beak gear and drives the bird's beak 12 to rotate counterclockwise, and the upper and lower binding ropes 5 are wound around the bird's beak 12 during the rotation of the bird's beak 12, and the bird's beak 12 opens and bites one end of the binding rope 5 during the rotation of the bird's beak 12, after which the rope shaving cam 124 drives the rope shaving plate 18 to approach the upper surface of the bird's beak 12, and then the bird's beak 12 swings forward, and the rope shaving plate 18 is relatively stationary in the front-to-back direction, and is wound around the bird's beak 12 during the forward movement of the bird's beak 12. The tying rope 5 is blocked by the rope shaving plate 18 and pushed off. In the process of pushing off the tying rope 5, a "slip knot" is formed, and the knotting work is completed; when the bird's beak 12 swings forward, the linkage shaft 17 also pushes the rope cutter 14 to swing backward. In the process of the rope cutter swinging backward, the rope cutter 14 pushes the lower strand of the tying rope 5 backward and downward to separate it to prevent it from being cut. As the rope cutter 14 continues to swing backward, the blade installed at the upper position of the rope cutter 14 cuts the upper strand of the tying rope 5. As the rope cutter 14 continues to swing backward, the lower strand of the tying rope 5 is pushed off from the buckle 13 by the pushing claw at the lower part of the rope cutter 14. At this time, the rope head 51 of the tying rope 5 connected to the winding rod 6 is clamped by the buckle 13, and is ready for use in the next working tying process. Because the pressing buckle 13 and the rope cutter 14 are moved to the left, the relative distance between the pressing buckle 13 and the rope cutter 14 and the bird's beak 12 is lengthened, so the rope end 51 of the bundled plastic bag 7 is lengthened, and the bundled plastic bag 7 is formed as follows. Figure 8 In the shape shown, the length of the rope end 51 is significantly lengthened.

[0034] The main difference between the second embodiment and the first embodiment is that: Figure 9 As shown, the buckle 13 and the rope cutter 14 are arranged on the bracket 2; the pushing mechanism 42 of the second embodiment is an external driving member 422, and the external driving member 422 is a cylinder.

[0035] like Figure 9As shown: the buckle 13 and the rope cutter 14 are installed on the inner side of the front edge of the bracket 2, so that the relative distance between the buckle 13 and the bird's beak 12 is adapted to the length of the predetermined extended rope end; a double-rod cylinder is installed on the front side of the bracket 2 as an external drive component 422, and the push claw 41 is installed on the cylinder rod seat of the double-rod cylinder; a proximity switch 423 is installed at a position corresponding to the bird's beak cam 121 on the bracket 2, and the proximity switch 423 is connected to the control system. The control system can be a single-chip microcomputer or a PLC programmable controller. The control system is connected to the solenoid valve, and the solenoid valve is connected to the double-rod cylinder. When the outer edge of the bird's beak cam 121 approaches the proximity switch 423, the control system can control the solenoid valve to retract the cylinder rod; the installation method of other components is the same as that of Example 1.

[0036] The working process of the second embodiment is as follows: in the initial state, the cylinder rod of the double-rod cylinder is extended and the bird's beak 12 is swung forward. After the winding rod 6 wraps the tying rope 5 around the buckle 13 and the plastic bag 7, the motor 16 drives the transmission shaft 15 to bring the outer edge of the bird's beak cam 121 into close proximity with the proximity switch 423, causing the proximity switch 423 to trigger and feed back a switch signal to the control system, thereby controlling the solenoid valve to open the cylinder 422, the cylinder rod seat and the push claw 41 to move rightward, pushing the tying rope 5 rightward to the right side of the bird's beak 12, thereby achieving the technical purpose of the rope pusher. The other working steps and working principles of the second embodiment are basically the same as those of the first embodiment and need not be repeated.

[0037] Example 3, as Figure 10 As shown, the main difference between the third embodiment and the second embodiment is that the external driving component 422 is an electric slide 4221. The electric slide 4221 is installed in the front side of the bracket 2. The push claw 41 is installed on the slide seat of the electric slide 4221. A proximity switch 423 is installed at the position of the bracket 2 corresponding to the bird's beak cam 121. The proximity switch 423 is connected to the control system, which is in turn connected to the electric slide 4221.

[0038] The working process of the third embodiment is as follows: Figure 10 As shown, when the winding rod 6 wraps the tying rope 5 around the plastic bag 7, the proximity switch 423 feeds back a switch signal to the control system, causing the slide motor of the electric slide 4221 to rotate, thereby driving the slide and the push claw 41 mounted on the slide to move rightward. Because the slide motor is a stepper motor or a servo motor, the servo motor is equipped with an encoder that can start and stop according to a preset rotation angle. When the push claw 41 moves to the right to a predetermined position, the slide motor stops rotating. After the bird's beak 12 swings backward, the slide motor reverses, causing the slide to drive the push claw 41 to return to the left and reset to its initial position. The subsequent working steps and working principles are basically the same as those in Example 1 and will not be repeated here.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] The above-described embodiments of the present invention do not limit the scope of protection of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A plastic bag strapping machine with an extended rope head, comprising a bird's beak knotter (1), the bird's beak knotter (1) comprising a machine head (11), a rope shaving plate (18), a bird's beak (12), a pressing buckle (13), a rope cutter (14), a motor (16), and a transmission shaft (15), characterized in that: A bracket (2) is also provided, the machine head (11) is connected to the bracket (2), the transmission shaft (15) is rotatably arranged on the bracket (2), the transmission shaft (15) is connected to the motor (16), and an external rope pusher (4) is also provided on one side of the machine head (11) or on the bracket (2), the external rope pusher (4) includes a pushing claw (41) and a pushing mechanism (42), the pushing claw (41) is connected to the pushing mechanism (42), and the pushing mechanism (42) is a cam assembly (421) or an external driving member (422), which is provided on the side of the machine head (11) or on the bracket (2).

2. The plastic bag strapping machine with an extended rope end according to claim 1, characterized in that: The pressing buckle (13) and the rope cutter (14) are mounted on the bracket (2), or connected to the machine head (11) via a connecting piece (3).

3. The plastic bag strapping machine with an extended rope end according to claim 1, characterized in that: The cam assembly (421) includes a pushing cam (4211), a guide rail (4213), a slider (4212), a roller (4214), and a return spring (4215). The pushing cam (4211) is arranged on the transmission shaft (15), and the slider (4212) is connected to one side of the machine head (11) or the bracket (2).

4. The plastic bag strapping machine with an extended rope end according to claim 3, characterized in that: The external driving component (422) is a cylinder or an electric slide (4221).

5. The plastic bag strapping machine with an extended rope end according to claim 1, characterized in that: The bracket (2) is also provided with a winding rod (6), a pressing plate (61), and a supporting plate (62).

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