A strapping connection device

Abstract

The present invention discloses a strapping tape connecting device, comprising a cam-link structure, an operating structure and a first baffle plate which cooperates with the operating structure to clamp the strapping tape in a working position, the operating structure comprising a welding head, the cam-link structure comprising a first connecting rod and a first cam and a first spring which are connected to the first connecting rod on the same side of a rotating shaft, the first cam and the first spring having opposite effects on the rotation direction of the first connecting rod, the end of the first connecting rod being connected to the welding head, the first spring being able to move the welding head toward the working position, and the first cam being able to move the welding head away from the working position; the welding head of the present invention is driven by the cam-link structure, the first spring being able to be in a stretched state all the time, and the tensile force being used to realize the cooperation between the welding head and the first baffle plate to weld the strapping tape, which can avoid bending and deformation of the first spring, ensure a stable clamping state, and thus improve the welding effect.

Description

Technical Field

[0001] The invention relates to the technical field of automated packaging equipment, in particular to a packaging belt connecting device. Background Art

[0002] With the emergence of polypropylene (PP) / polyethylene terephthalate (PET) plastic strapping machines, the above plastic straps are gradually used to replace steel strapping in many fields, especially in the light industry field, making strapping machines rapidly popular. Generally speaking, the entire strapping process of an automated strapping machine must go through several steps, such as feeding the strap, feeding the strap in place, pressing the head end (free end), collecting the strap, pressing the tail end (wireless long end), welding and cutting the strap, spitting the strap, and resetting the machine head. In these steps, the actions of the strap pressing device and the strap cutting device have a certain sequence, and the most critical step is the welding step. In existing strapping machines, cam devices are usually used for mechanical interlocking, and the action sequence of the strap pressing device or the strap cutting device is determined by cams of different shapes. Of course, if the welding process is completed only by relying on the cam, the processes of pressing the head end and the tail end of the strap can be replaced by other methods.

[0003] For example, a Chinese patent with application publication number CN 104670548 A discloses a baling machine, wherein a driving mechanism includes a rotating rod, a first driving device for driving the rotating rod to rotate, a shearing cam, a first clamping cam, and a first door-opening cam arranged on the rotating rod at intervals in the vertical direction and respectively used to push a cutter, a clamping block, and a first rotating door. This scheme uses the pushing stroke of the cam as the working stroke, and the strokes of the cutter, the clamping block, and the first rotating door are limited by the shape of the cam. When the clamping block is worn or the thickness of the belt changes, it is necessary to manually adjust the length of the clamping block or replace the clamping block, causing inconvenience in use. If it is not replaced in time, it will affect the connection effect of the strapping belt, and ultimately affect the packaging effect.

[0004] For another example, a Chinese patent with application number CN 112027238 A discloses a strapping and baling machine, which is provided with a cam device and a spring. The movable end of the spring is connected to one end of the corresponding swing arm, and the swing arm is abutted against the corresponding cam. The other end of the swing arm is connected to the corresponding tool. The swing arm can rotate around the middle position, thereby playing the role of a lever. When the cam is in the advancement stroke, the cam compresses the corresponding spring to store energy, and at the same time resets the corresponding tool through the corresponding swing arm. When the cam is in the return stroke, the cam releases the corresponding spring, and the spring pushes the corresponding swing arm and presses the corresponding tool downward. It can be seen that this scheme uses the compressed elastic potential energy of the spring to push the swing arm to move. However, the movement state of the compressed spring is not stable, and it is possible to bend and deform, thereby affecting the push of the swing arm. Therefore, this scheme has certain defects. Summary of the invention

[0005] The object of the present invention is to provide a strapping tape connecting device to solve the problems existing in the above-mentioned prior art. A welding head for welding and connecting the strapping tape is provided. The welding head is driven by a cam-connecting rod structure. The cam-connecting rod structure includes a first connecting rod and a first cam and a first spring connected to the same side of the rotating shaft on the first connecting rod. The first spring can always be in a stretched state, and the tension is used to realize the cooperation between the welding head and the first baffle to weld the strapping tape, which can give full play to the advantages of the spring, avoid bending deformation, ensure a stable compression state, and thus improve the welding effect.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a strapping tape connecting device, comprising a cam-connecting rod structure, an operating structure, and a first baffle that cooperates with the operating structure to clamp the strapping tape at a working position, the operating structure comprising a welding head, the cam-connecting rod structure comprising a first connecting rod and a first cam and a first spring connected to the same side of a rotating shaft on the first connecting rod, the first cam and the first spring having opposite effects on the rotation direction of the first connecting rod, the end of the first connecting rod being connected to the welding head, the first spring being able to move the welding head toward the working position, and the first cam being able to move the welding head away from the working position.

[0008] Preferably, the end of the first connecting rod connected to the welding head is also provided with a cutter for cutting the strapping tape.

[0009] Preferably, it comprises a welding motor and an eccentric shaft connected to the welding motor, and the eccentric shaft is connected to the welding head through a welding connecting rod.

[0010] Preferably, the operating structure includes a tail clamping knife, which is used to clamp the tail of the packing tape; the cam-link structure includes a second connecting rod and a second cam and a second spring connected to the second connecting rod on the same side of the rotating shaft, the second cam and the second spring have opposite effects on the rotation direction of the second connecting rod, the end of the second connecting rod is connected to the tail clamping knife, the second spring can move the tail clamping knife toward the working position, and the second cam can move the tail clamping knife away from the working position.

[0011] Preferably, the operating structure includes a head clamping knife, which is used to clamp the head of the packing tape; the cam-connecting rod structure includes a third connecting rod and a third cam and a third spring connected to the third connecting rod on the same side of the rotating shaft, the third cam and the third spring have opposite effects on the rotation direction of the third connecting rod, the end of the third connecting rod is connected to the head clamping knife, the third spring can move the head clamping knife toward the working position, and the third cam can move the head clamping knife away from the working position.

[0012] Preferably, the rotating shaft of the first connecting rod is arranged on the first connecting rod close to the end connected to the welding head, the rotating shaft of the second connecting rod is arranged on the second connecting rod close to the end connected to the tail clamping knife, and the rotating shaft of the third connecting rod is arranged on the third connecting rod close to the end connected to the head clamping knife.

[0013] Preferably, the first connecting rod, the second connecting rod and the third connecting rod are all V-shaped structures, and the apex of each V-shaped structure is respectively meshed and connected with the corresponding first cam, the second cam and the third cam.

[0014] Preferably, the cam-connecting rod structure includes a fourth connecting rod and a fourth cam and a fourth spring connected to the same side of the rotating shaft on the fourth connecting rod, the fourth cam and the fourth spring have opposite effects on the rotation direction of the fourth connecting rod, the end of the fourth connecting rod is connected to the first baffle, the fourth spring can move the first baffle toward the working position, and the fourth cam can move the first baffle away from the working position.

[0015] Preferably, it includes a second baffle for limiting the position of the head end of the strapping tape, the cam-link structure includes a fifth link and a fifth cam and a fifth spring connected to the fifth link on the same side of the rotating shaft, the fifth cam and the fifth spring have opposite effects on the rotation direction of the fifth link, the end of the fifth link is connected to the second baffle, the fifth spring can move the second baffle toward the working position, and the fifth cam can move the second baffle away from the working position.

[0016] Preferably, the fourth connecting rod and the fifth connecting rod are both L-shaped structures, the endpoints of the short sides of each L-shaped structure are respectively engaged and connected with the corresponding fourth cam and the fifth cam, and the vertices of each L-shaped structure are respectively connected with the corresponding fourth spring and the fifth spring.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] (1) The present invention is provided with a welding head for welding and connecting the strapping tape, and the welding head is driven by a cam-link structure, and the cam-link structure includes a first connecting rod and a first cam and a first spring connected to the same side of the rotating shaft of the first connecting rod. The first spring can always be in a stretched state, and the tension is used to achieve the cooperation between the welding head and the first baffle to weld the strapping tape, which can give full play to the advantages of the spring, avoid bending deformation, ensure a stable compression state, and thus improve the welding effect;

[0019] (2) The rotating shaft of the first connecting rod of the present invention is arranged on the first connecting rod near the end connected to the welding head, the rotating shaft of the second connecting rod is arranged on the second connecting rod near the end connected to the tail clamping knife, and the rotating shaft of the third connecting rod is arranged on the third connecting rod near the end connected to the head clamping knife, that is, the rotating shafts of the connecting rods of each clamping and welding structure are arranged on one end of the connecting rod near the working structure, and the cams and springs on each connecting rod are installed on the side of the rotating shaft. Both the cam and the connecting rod can play a lever role, improve the control ability of the working structure, and thus improve the clamping, welding effect or reset effect;

[0020] (3) The first connecting rod, the second connecting rod and the third connecting rod of the present invention are all V-shaped structures, and the vertices of each V-shaped structure are respectively engaged and connected with the corresponding first cam, second cam and third cam, so that an installation space is formed inside the V-shaped structure, which can facilitate the installation of other components and structures, making the entire device compact;

[0021] (4) The fourth connecting rod and the fifth connecting rod of the present invention are both L-shaped structures, and the end points of the short sides of each L-shaped structure are respectively meshed and connected with the corresponding fourth cam and fifth cam, and the apex of each L-shaped structure is respectively connected with the corresponding fourth spring and fifth spring. The purpose of such arrangement is, on the one hand, to form an installation space for other components and structures inside the L-shaped structure, and on the other hand, to convert the arrangement direction of the fourth connecting rod and the fifth connecting rod relative to the other connecting rods, thereby making it easier to arrange the components and structures, and further improving the compactness of the entire device structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the explosion structure of the present invention;

[0024] Figure 2 It is a schematic structural diagram of one cross section of the present invention;

[0025] Figure 3 is a schematic structural diagram of the first connecting rod of the present invention;

[0026] Figure 4 is a schematic structural diagram of the fourth connecting rod of the present invention;

[0027] Among them, 1. middle clamping knife; 2. welding head; 3. tail clamping knife; 4. head clamping knife; 5. second connecting rod; 6. first connecting rod; 61. first meshing part; 62. first working part; 63. first spring connecting part; 64. first rotating shaft; 7. third connecting rod; 8. second spring; 9. first spring; 10. third spring; 11. second cam; 12. fourth cam; 13. first cam; 14. fifth cam; 15. third cam; 16. fourth connecting rod; 161. fourth meshing part; 162. fourth working part; 163. fourth spring connecting part; 164. fourth rotating shaft; 17. fifth connecting rod; 18. fourth spring; 19. fifth spring; 20. first baffle; 21. second baffle; 22. welding connecting rod; 23. cutting knife. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The purpose of the present invention is to provide a strapping tape connecting device to solve the problems existing in the prior art. A welding head for welding and connecting the strapping tape is provided. The welding head is driven by a cam-connecting rod structure. The cam-connecting rod structure includes a first connecting rod and a first cam and a first spring connected to the same side of a rotating shaft on the first connecting rod. The first spring can always be in a stretched state, and the tension is used to achieve the cooperation between the welding head and the first baffle to weld the strapping tape, which can give full play to the advantages of the spring, avoid bending deformation, ensure a stable compression state, and thus improve the welding effect.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1 to 4As shown, the present invention provides a strapping tape connection device for welding and connecting strapping tape, specifically, comprising a cam connecting rod structure, an operating structure and a first baffle 20 that cooperates with the operating structure to clamp the strapping tape at a working position, wherein the cam connecting rod structure may include the same camshaft and a plurality of connecting rods axially spaced on the camshaft, and according to the requirements, the connecting rod and the cam may be provided with one or more sets, and when multiple sets are provided, each cam is meshed and connected with the corresponding connecting rod, that is, by utilizing the rotation of the cam, the connecting rod can be pushed to rotate when the cam is in the advancing stroke, and when the cam is in the returning stroke, the cam cannot actively drive the connecting rod to return, and at this time, it depends on the tension of the spring; different connecting rods are connected with different operating structures, so that different cams are driven to rotate by the rotation of the camshaft, and the driving of the connecting rod is realized by changing the meshing position of the cam and the connecting rod and under the action of the spring, thereby changing the action state of the operating structure and realizing different operating processes; in addition, the working position mentioned here refers to the position where the operating process is completed, and since the state of the strapping tape before and after packaging is different, it is necessary to control the operating structure to reach the working position and leave the working position to complete the strapping tape connection process. It should be noted that the shape curves of different cams need to be designed accordingly according to the actions to be achieved, so as to achieve the operation sequence of different operation structures. The operation structure includes a welding head 2, which is used to weld the ends of the strapping belt into a ring through friction action to achieve the packaging of the packaged object. The cam-connecting rod structure includes a first connecting rod 6 and a first cam 13 and a first spring 9 connected on the same side of the rotating shaft of the first connecting rod 6. According to the position where the first cam 13 and the first spring 9 are connected to the first connecting rod 6, it can be known that the effects of the first cam 13 and the first spring 9 on the first connecting rod 6 (the direction in which the first connecting rod 6 rotates around its rotating shaft when the force direction is the same) are the same. A welding head 2 is connected to the end of the first connecting rod 6. In order to achieve control of the welding head 2, the first cam 13 and the first spring 9 have opposite effects on the rotation direction of the first connecting rod 6, that is, the first spring 9 can move the welding head 2 to the working position, that is, the welding head 2 cooperates with the first baffle 20 to clamp and weld the overlapping head and tail ends of the strapping tape; after welding is completed, the first cam 13 can move the welding head 2 away from the working position, release the clamping of the strapping tape, so that the strapping tape can be detached from the device, and the connection of the strapping tape is completed. The present invention is provided with a welding head 2 for welding and connecting the strapping tape. The welding head 2 is driven by a cam-connecting rod structure. The cam-connecting rod structure includes a first connecting rod 6 and a first cam 13 and a first spring 9 connected to the first connecting rod 6 on the same side of the rotating shaft. The first spring 9 can always be in a stretched state and utilizes the tension to achieve the cooperation between the welding head 2 and the first baffle 20 to weld the strapping tape. This can give full play to the advantages of the spring, avoid bending deformation, ensure a stable clamping state, and thus improve the welding effect.

[0032] like Figure 1 As shown, in addition to being connected to the welding head 2, the end of the first connecting rod 6 may also be provided with a cutter 23 for cutting the strapping tape. Here, it should be noted that the cutter 23 and the welding head 2 are pushed to cut and press the wireless end of the welding strapping tape through the push block (middle clamping knife 1) at the end of the first connecting rod 6. The cutter 23, the welding head 2 and the push block (middle clamping knife 1) are relatively independent units so as not to affect each other during the vibration and friction of the welding head 2. The cutter 23 will reach the working position with the strapping tape along with the welding head 2 as the first connecting rod 6 moves. When the welding head 2 moves to complete the friction welding, the tail end (wireless end) of the strapping tape will be cut off to form a strapping tape ring, thereby completing the strapping tape connection process.

[0033] The welding head 2 is installed on the middle clamping knife 1, and the middle clamping knife 1 is hingedly connected to the first connecting rod 6. The movement of the middle clamping knife 1 will drive the welding head 2 to move. At the same time, the welding head 2 is connected to the welding connecting rod 22, and the welding connecting rod 22 is connected to the welding motor through the eccentric shaft. The eccentric shaft and the welding connecting rod 22 are driven by the welding motor to move, and then the welding head 2 can be driven to perform friction welding relative to the strapping tape. In addition, since the welding head 2 is connected to both the middle clamping knife 1 and the welding connecting rod 22, the welding head 2 can obtain a certain clamping force through the middle clamping knife 1 and realize friction welding through the welding connecting rod 22, thereby ensuring the welding effect.

[0034] The operating structure may further include a tail clamping knife 3, which is used to clamp the tail (i.e., the wireless end) of the strapping tape. The purpose of clamping the tail is to fix the strapping tape after it is tightened, so as to prevent the strapping tape from continuing to be transported and causing the strapping to become loose during the welding process, thereby avoiding waste of strapping tape caused by unqualified strapping quality or the need to re-pack due to loose strapping. The tail clamping knife 3 can be driven by a cam-connecting rod structure. Specifically, the cam-connecting rod structure includes a second connecting rod 5 and a second cam 11 and a second spring 8 connected on the same side of the rotating shaft of the second connecting rod 5. According to the position where the second cam 11 and the second spring 8 are connected to the second connecting rod 5, it can be known that the effects of the second cam 11 and the second spring 8 on the second connecting rod 5 (the direction in which the second connecting rod 5 rotates around its rotating shaft when the force direction is the same) are the same. The end of the second connecting rod 5 is connected to the tail clamping knife 3. In order to control the tail clamping knife 3, the second cam 11 and the second spring 8 have opposite effects on the rotation direction of the second connecting rod 5, that is, the second spring 8 can move the tail clamping knife 3 to the working position, that is, the tail clamping knife 3 cooperates with the first baffle 20 to clamp the tail of the strapping tape; after welding is completed, the second cam 11 can move the tail clamping knife 3 away from the working position, release the clamping of the tail of the strapping tape, and allow the strapping tape to detach from the device.

[0035] The operating structure may further include a head clamping knife 4, which is used to clamp the head (i.e., the free end) of the strapping tape. The purpose of clamping the head is to facilitate the reverse conveying of the strapping tape for tightening operation, that is, after clamping the head of the strapping tape, the tail (i.e., the wireless end) of the strapping tape is pulled to tighten it, so that the packaged object can be tightly wound. The head clamping knife 4 can be driven by a cam-connecting rod structure. Specifically, the cam-connecting rod structure includes a third connecting rod 7 and a third cam 15 and a third spring 10 connected to the same side of the rotating shaft of the third connecting rod 7. According to the position at which the third cam 15 and the third spring 10 are connected to the third connecting rod 7, it can be known that the effects of the third cam 15 and the third spring 10 on the third connecting rod 7 (the direction in which the third connecting rod 7 rotates around its rotating shaft when the force direction is the same) are the same. The end of the third connecting rod 7 is connected to the head clamping knife 4. In order to achieve control of the head clamping knife 4, the third cam 15 and the third spring 10 have opposite effects on the rotation direction of the third connecting rod 7, that is, the third spring 10 can move the head clamping knife 4 to the working position, that is, the head clamping knife 4 cooperates with the first baffle 20 to clamp the head of the strapping tape; after welding is completed, the third cam 15 can move the head clamping knife 4 away from the working position, release the clamping of the head of the strapping tape, and allow the strapping tape to detach from the device.

[0036] Combination Figure 3As shown, the first connecting rod 6 includes a first engaging portion 61 engaged with the first cam 13, and the first engaging portion 61 can be provided with a roller or other structure to reduce the friction force of direct engagement with the cam; includes a first spring connecting portion 63 connected to the end of the first spring 9, and the first spring connecting portion 63 is hinged with a spring fixing device, and the spring fixing device can penetrate into the inside of the first spring 9 and be fixed to the end of the first spring 9, so that the first spring 9 can apply a pulling force to the first connecting rod 6; includes a first operating portion 62 connected to the middle clamping knife 1, and the first operating portion 62 is hingedly connected to the middle clamping knife 1 to enable the middle clamping knife 1 to move linearly. It is used to push the welding head 2 to clamp and weld the strapping tape; it also includes a first rotating shaft 64, which is the rotating shaft of the first connecting rod 6, and is arranged on the first connecting rod 6 near the end connected with the welding head 2 (middle clamping knife 1). At this time, the force applied by the first spring 9 to the first connecting rod 6 through the first spring connecting part 63 and the force applied by the first cam 13 to the first connecting rod 6 through the first engaging part 61 can utilize the lever principle to improve the force on the middle clamping knife 1 and the welding head 2, thereby improving the control ability of the middle clamping knife 1 and the welding head 2, thereby improving the clamping, welding effect or reset effect. It should be noted that the second connecting rod 5 and the third connecting rod 7 can adopt the same structure as the first connecting rod 6, that is, the second connecting rod 5 includes a second meshing portion, a second working portion, a second spring connecting portion and a second rotating shaft; the third connecting rod 7 includes a third meshing portion, a third working portion, a third spring connecting portion and a third rotating shaft; and the second rotating shaft of the second connecting rod 5 is arranged on the second connecting rod 5 close to the end connected to the tail clamping knife 3, and the third rotating shaft of the third connecting rod 7 is arranged on the third connecting rod 7 close to the end connected to the head clamping knife 4. Both the second connecting rod 5 and the third connecting rod 7 can utilize the effect of the lever principle to better control the tail clamping knife 3 and the head clamping knife 4.

[0037] like Figures 1 to 3 As shown, the first connecting rod 6, the second connecting rod 5 and the third connecting rod 7 are all V-shaped structures, and the vertices of each V-shaped structure are respectively provided with meshing parts that mesh with the cams, and each meshing part is respectively meshed and connected with the corresponding first cam 13, the second cam 11 and the third cam 15. An installation space can be formed inside the V-shaped structure, which can facilitate the installation of other components and structures, making the entire device compact.

[0038] like Figure 1As shown, the cam-link structure may further include a fourth link 16 and a fourth cam 12 and a fourth spring 18 connected to the same side of the rotating shaft of the fourth link 16. According to the position at which the fourth cam 12 and the fourth spring 18 are connected to the fourth link 16, the effects of the fourth cam 12 and the fourth spring 18 on the fourth link 16 (the direction in which the fourth link 16 rotates around its rotating shaft when the force direction is the same) are the same. A first baffle 20 is connected to the end of the fourth link 16. In order to control the first baffle 20, the fourth cam 12 and the fourth spring 18 have opposite effects on the rotation direction of the fourth link 16, that is, the fourth spring 18 can move the first baffle 20 to the working position, that is, the tail clamping knife 3, the middle clamping knife 1 (welding head 2) and the head clamping knife 4 cooperate with the first baffle 20 to clamp and weld the strapping tape; after welding is completed, the fourth cam 12 can move the first baffle 20 away from the working position, release the clamping of the strapping tape, and enable the strapping tape to detach from the device.

[0039] It can also include a second baffle 21 for limiting the position of the head (i.e., the free end) of the strapping tape. A boss is provided on the second baffle 21. When the second baffle 21 moves to the working position, the boss can form a barrier for the strapping tape penetration position, thereby preventing the head of the strapping tape from continuing to move, and finally forming a connection area where the head and tail of the strapping tape overlap. The second baffle 21 can be driven to change its position by means of the cam-link structure, and the cam structure can be designed and adjusted according to the position of actual requirements. Specifically, the cam-link structure can include a fifth connecting rod 17 and a fifth cam 14 and a fifth spring 19 connected to the same side of the rotating shaft of the fifth connecting rod 17. According to the position at which the fifth cam 14 and the fifth spring 19 are connected to the fifth connecting rod 17, it can be known that the effect of the fifth cam 14 and the fifth spring 19 on the fifth connecting rod 17 (the direction in which the fifth connecting rod 17 rotates around its rotating shaft when the force direction is the same) is the same. The end of the fifth connecting rod 17 is connected to the second baffle 21. In order to achieve control of the second baffle 21, the fifth cam 14 and the fifth spring 19 have opposite effects on the rotation direction of the fifth connecting rod 17, that is, the fifth spring 19 can move the second baffle 21 to the working position, that is, the second baffle 21 can block the movement of the head of the strapping tape; before formal welding, the second baffle 21 needs to be moved out of the working position, that is, the fifth cam 14 can move the second baffle 21 away from the working position to avoid affecting the welding process.

[0040] Combination Figure 4As shown, the fourth connecting rod 16 includes a fourth engaging portion 161 engaged with the fourth cam 12, and the fourth engaging portion 161 can be provided with structures such as rollers to reduce the friction force of direct engagement with the cam; includes a fourth spring connecting portion 163 connected to the end of the fourth spring 18, and the fourth spring connecting portion 163 is hinged with a spring fixing device, and the spring fixing device can form a hook form to be fixed to the end of the fourth spring 18, so that the fourth spring 18 can apply a pulling force to the fourth connecting rod 16; includes a fourth working portion 162 connected to the first baffle 20, and the fourth working portion 162 is hingedly connected to the first baffle 20 to be able to push the first baffle 20 to complete lateral movement, and can cooperate with the tail clamping knife 3, the middle clamping knife 1 (welding head 2) and the head clamping knife 4 in the working position to complete welding; also includes a fourth rotating shaft 164, and the fourth rotating shaft 164 is the rotating shaft of the fourth connecting rod 16. It should be noted that the fifth connecting rod 17 can adopt the same structure as the fourth connecting rod 16, that is, the fifth connecting rod 17 includes a fifth meshing portion, a fifth operating portion, a fifth spring connecting portion and a fifth rotating shaft. The fourth connecting rod 16 and the fifth connecting rod 17 can both be set to an L-shaped structure, and the end points of the short sides of each L-shaped structure are respectively provided with meshing portions, which are meshed and connected with the corresponding fourth cam 12 and the fifth cam 14 through each meshing portion, and the vertices of each L-shaped structure are respectively provided with spring connecting portions, which are connected with the corresponding fourth spring 18 and the fifth spring 19 through the spring connecting portions. The L-shaped structure setting mode can, on the one hand, form an installation space for other components and structures inside the L-shaped structure, and on the other hand, can convert the setting direction of the fourth connecting rod 16 and the fifth connecting rod 17 relative to other connecting rods, so as to facilitate the setting of various components and structures, and further improve the coherence of the entire device structure.

[0041] The present invention mainly comprises five connecting rods that are driven by corresponding five cams (arranged on the same camshaft) to perform five different linear motions, respectively controlling the middle clamping knife 1 (welding head 2), the tail clamping knife 3, the head clamping knife 4, the first baffle 20 and the second baffle 21. Among them, the middle clamping knife 1 (welding head 2), the tail clamping knife 3 and the head clamping knife 4 require strong pressing force, and large connecting rod tension springs can be respectively provided on the corresponding first connecting rod 6, the second connecting rod 5 and the third connecting rod 7, that is, the first spring 9, the second spring 8 and the third spring 10 are all large connecting rod tension springs. And the rotating shaft of each connecting rod is close to the corresponding operating structure, thereby forming a high-strength lever structure, so that the head, middle and tail of the strapping belt connection can be effectively clamped, and the friction welding process can be completed at the same time. The linear motion of the first baffle 20 and the second baffle 21 does not require a large force, so the corresponding fourth spring 18 and the fifth spring 19 are small connecting rod tension springs, and the corresponding connecting rod rotating shaft can also be installed in the middle of the fourth connecting rod 16 and the fifth connecting rod 17.

[0042] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A strapping connection device, characterized in that: The invention comprises a cam-link structure, an operating structure and a first baffle which cooperates with the operating structure to clamp the strapping belt in the working position, the operating structure comprises a welding head, the cam-link structure comprises a first connecting rod and a first cam and a first spring which are connected on the same side of a rotating shaft on the first connecting rod, the first cam and the first spring have opposite effects on the rotation direction of the first connecting rod, the end of the first connecting rod is connected to the welding head, the first spring can make the welding head move toward the working position, and the first cam can make the welding head move away from the working position, the rotating shaft of the first connecting rod is arranged on the first connecting rod near the end connected with the welding head, the end of the first connecting rod away from the rotating shaft is provided with a first spring connecting part, the first spring connecting part is hinged with a spring fixing device, the spring fixing device penetrates into the inner side of the first spring and is fixed to the end of the first spring, the first spring is always in a stretched state, the first connecting rod is a V-shaped structure, the vertex of the V-shaped structure of the first connecting rod is provided with a first meshing part, and the first meshing part meshes with the first cam.

2. The strapping tape connecting device according to claim 1, characterized in that: The end of the first connecting rod connected to the welding head is also provided with a cutter for cutting the strapping tape.

3. The strapping tape connecting device according to claim 2, characterized in that: The invention comprises a welding motor and an eccentric shaft connected with the welding motor. The eccentric shaft is connected to the welding head through a welding connecting rod.

4. The strapping tape connecting device according to any one of claims 1 to 3, characterized in that: The operating structure includes a tail clamping knife, which is used to clamp the tail of the strapping tape; the cam connecting rod structure includes a second connecting rod and a second cam and a second spring connected to the same side of the rotating shaft of the second connecting rod, the second cam and the second spring have opposite effects on the rotation direction of the second connecting rod, the end of the second connecting rod is connected to the tail clamping knife, the second spring can move the tail clamping knife toward the working position, and the second cam can move the tail clamping knife away from the working position.

5. The strapping tape connection device according to claim 4, characterized in that: The operating structure includes a head clamping knife, which is used to clamp the head of the strapping tape; the cam-link structure includes a third connecting rod and a third cam and a third spring connected to the third connecting rod on the same side of the rotating shaft, the third cam and the third spring have opposite effects on the rotation direction of the third connecting rod, the end of the third connecting rod is connected to the head clamping knife, the third spring can move the head clamping knife toward the working position, and the third cam can move the head clamping knife away from the working position.

6. The strapping tape connecting device according to claim 5, characterized in that: The rotating shaft of the first connecting rod is arranged on the first connecting rod near the end connected to the welding head, the rotating shaft of the second connecting rod is arranged on the second connecting rod near the end connected to the tail clamping knife, and the rotating shaft of the third connecting rod is arranged on the third connecting rod near the end connected to the head clamping knife.

7. The strapping tape connecting device according to claim 6, characterized in that: The first connecting rod, the second connecting rod and the third connecting rod are all V-shaped structures, and the apex of each V-shaped structure is respectively meshed and connected with the corresponding first cam, the second cam and the third cam.

8. The strapping tape connecting device according to claim 7, characterized in that: The cam-connecting rod structure includes a fourth connecting rod and a fourth cam and a fourth spring connected to the same side of the rotating shaft on the fourth connecting rod. The fourth cam and the fourth spring have opposite effects on the rotation direction of the fourth connecting rod. The end of the fourth connecting rod is connected to the first baffle plate. The fourth spring can move the first baffle plate toward the working position, and the fourth cam can move the first baffle plate away from the working position.

9. The strapping tape connecting device according to claim 8, characterized in that: It includes a second baffle for limiting the position of the head end of the strapping tape, the cam-link structure includes a fifth link and a fifth cam and a fifth spring connected to the same side of the rotating shaft of the fifth link, the fifth cam and the fifth spring have opposite effects on the rotation direction of the fifth link, the end of the fifth link is connected to the second baffle, the fifth spring can move the second baffle toward the working position, and the fifth cam can move the second baffle away from the working position.

10. The strapping tape connecting device according to claim 9, characterized in that: The fourth connecting rod and the fifth connecting rod are both L-shaped structures, the endpoints of the short sides of each L-shaped structure are respectively engaged and connected with the corresponding fourth cam and the fifth cam, and the vertices of each L-shaped structure are respectively connected with the corresponding fourth spring and the fifth spring.

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