Bag opening mechanism and packaging machine having the same

Abstract

The present invention provides a bag opening mechanism and a packaging machine having the same, belonging to the field of packaging technology, wherein the bag opening mechanism comprises: a driving clutch mechanism, a detection device and a pair of bag opening suction nozzles, the pair of bag opening suction nozzles being used to adsorb the bag surfaces on both sides of the packaging bag; the driving clutch mechanism drives the pair of bag opening suction nozzles to move back and forth in directions of relative approach and distance, and a clutch is provided between the driving clutch mechanism and the driven bag opening suction nozzles; when the driven bag opening suction nozzles are subject to the constraint force of the bag opening, the clutch separates the driving clutch mechanism from the driven bag opening suction nozzles, causing the driven bag opening suction nozzles to stop moving, while the driving clutch mechanism continues to move a certain distance in the direction of bag opening, and the detection device detects the relative movement between the two; the bag opening mechanism of the present invention detects the relative movement of the bag opening suction nozzles through the detection device, thereby judging whether there is a packaging bag and whether the bag opening is successful.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging, and in particular to a bag opening mechanism and a packaging machine having the same. Background Art

[0002] Automatic packaging production lines are often used in the food industry. They fill food into packaging bags, then extract the air from the bags and seal them after reaching a predetermined vacuum level. Due to the vacuum packaging, the food can resist oxidation and achieve the purpose of long-term preservation.

[0003] Existing patent document CN106144030B discloses a pre-made bag vacuum packaging machine, including an upper bag opening mechanism and a lower bag opening mechanism, wherein the upper bag opening mechanism and the lower bag opening mechanism respectively include an upper suction cup and a lower suction cup, and the upper suction cup and the lower suction cup are used to open the opening of the packaging bag through two symmetrically arranged suction cups.

[0004] However, in the above solution, before the opening of the packaging bag is opened, the presence of the packaging bag is not detected, so the packaging bag is easily emptied when the material is subsequently added.

[0005] To address this issue, Chinese patent document CN105059609A discloses an automatic bagging machine that uses a bag-feeding conveyor belt to transport bags. A bag-feeding position detection sensor is installed at the designated bag-removal position. Specifically, the bag-feeding position detection sensor is a light sensor. When the bag-feeding conveyor belt transports the bag to the designated bag-removal position, the bag-feeding position detection sensor senses the bag. The control system then stops the bag-feeding reduction motor, causing the bag to stop at the designated bag-removal position, facilitating the next step of bag-removal and bag-stirring. This arrangement ensures that the bag-removing mechanism's bag-removing manipulator can accurately grasp the bag.

[0006] However, in the above solution, it can only be guaranteed that there is a packaging bag on the bag-picking robot of the bag-picking mechanism. When the bag is expanded, it cannot be guaranteed that the packaging bag is expanded successfully. Therefore, the problem of emptying the bag may occur during subsequent addition of materials. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the automatic packaging production line in the prior art that it is impossible to detect whether the bag is successfully opened and there is a problem of emptying the packaging bag when filling it, thereby providing a bag opening mechanism.

[0008] In order to solve the above technical problems, the present invention provides a bag opening mechanism, comprising: a pair of bag opening suction nozzles, each movably arranged on a frame and used to suck the bag surface on both sides of the packaging bag;

[0009] a driving clutch mechanism, disposed between the frame and at least one of the bag opening nozzles, and driving at least the bag opening nozzle to reciprocate in a direction relatively approaching and away from the other bag opening nozzle, and a clutch is provided between the driving clutch mechanism and the driven bag opening nozzle; when the driven bag opening nozzle is constrained by the bag opening opening force, the clutch decouples the driving clutch mechanism from the driven bag opening nozzle, causing the driven bag opening nozzle to stop moving, while the driving clutch mechanism continues to move a certain distance in the bag opening direction;

[0010] The detection device is arranged between the driven bag opening nozzle and the corresponding driving clutch mechanism to detect the relative movement between the two.

[0011] Optionally, when close to the bag surface of the packaging bag, the two bag opening nozzles are staggered.

[0012] Optionally, the driving clutch mechanism has a driving member movably arranged on the frame, and the driven bag opening nozzle is movably mounted on the driving member; the clutch is arranged between the driving member and the driven bag opening nozzle; the clutch has a separation force threshold, and the separation force threshold is less than the restraint force applied to the bag opening of the packaging bag before the two clamping jaws that clamp the two ends of the bag opening of the packaging bag and transport the packaging bag to the bag opening station move closer to each other to cooperate in bag opening.

[0013] Optionally, the detection device is fixedly arranged on the driving member near the bag opening nozzle.

[0014] Optionally, the clutch has a biasing member disposed between the driving member and the driven bag opening nozzle, and the biasing member applies a biasing force on the driven bag opening nozzle toward a direction toward opening the bag mouth.

[0015] Optionally, the biasing member is a spring, and the separation force threshold is the elastic force at which the spring starts to deform.

[0016] Optionally, the driven bag opening nozzle is arranged on one end of a connecting arm and is rotatably arranged on the driving member through the connecting arm, and the spring acts between the driving member and the connecting arm.

[0017] Optionally, the connecting arm is relatively fixedly connected to a limit plate, and the detection device is arranged close to the limit plate.

[0018] Optionally, a baffle is fixedly provided on the driving member, and when there is no restraining force for opening the bag opening, the limiting plate abuts against the baffle.

[0019] Optionally, the pair of bag opening nozzles are divided into a first bag opening nozzle and a second bag opening nozzle, and accordingly, the first bag opening nozzle and the second bag opening nozzle are respectively movably mounted on the corresponding first driving member and the second driving member through their respective first connecting arms and second connecting arms.

[0020] Optionally, the first driving member and the second driving member are two driving rods arranged in parallel; the first driving member is provided with multiple first connecting arms in sequence along the length direction of the rod intersecting with material conveying, and the second driving member is provided with multiple second connecting arms in sequence along the length direction.

[0021] Optionally, the first driving member and the second driving member are linked to each other, and when the first driving member moves in a first direction, the second driving member moves in an opposite direction.

[0022] The present invention provides a packaging machine, comprising: a conveying mechanism, the conveying mechanism having a conveying frame, the conveying frame being provided with a bag opening mechanism according to any one of the above-mentioned solutions;

[0023] A conveying device is provided in the conveying frame, and a clamping module is connected to the conveying device. The conveying device is used to convey the clamping module to multiple workstations, including a bag opening station, at which the bag opening mechanism is used to open the opening of the packaging bag.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The bag opening mechanism provided by the present invention drives a pair of bag opening nozzles via a driving clutch mechanism. During the bag opening process, the bag opening nozzles are restrained by the force exerted by the bag opening, causing them to stop moving, while the driving clutch mechanism continues to move a certain distance in the direction of the bag opening. A detection device detects the relative movement between the bag opening nozzle and the driving clutch mechanism, thereby determining whether a bag is present and whether the bag opening is successful. Specifically, during bag opening, when the detection device detects relative movement between the bag opening nozzle and the driving clutch mechanism, it determines that a bag is present. Based on this, after bag opening is complete, when the detection device detects that the relative movement between the bag opening nozzle and the driving clutch mechanism has reset, it determines that the bag opening is successful. That is, while still using one set of detection devices, the two tests of bag delivery and bag opening success are respectively completed through two changes in mechanical action.

[0026] 2. The bag opening mechanism provided by the present invention has two bag opening nozzles staggeredly arranged, which can avoid the problem that when there is no packaging bag at a pair of bag opening nozzles, the two bag opening nozzles are attracted to each other and cannot be opened, and then the other bag opening nozzles with packaging bags arranged on the driving member cannot be opened for further packaging processing.

[0027] 3. The bag opening mechanism provided by the present invention drives the clutch mechanism to cooperate with the two clamping claws. During the bag opening process, the two clamping claws clamping the two ends of the bag opening of the packaging bag move closer to each other for bag opening than the bag opening action of the two bag opening nozzles. The separation threshold of the clutch is less than the restraining force applied to the packaging bag during the bag opening process, causing the two bag opening nozzles to stop moving, thereby causing relative displacement between them and the driving clutch mechanism, which is detected by the detection device.

[0028] 4. The bag opening mechanism provided by the present invention, after the two clamping jaws move closer to each other to release the restraining force of the packaging bag on the bag opening nozzle, drives the bag opening nozzle to reset relative to the driving clutch mechanism through the biasing member, thereby further opening the packaging bag, and is detected by the detection device to determine whether the bag opening is successful.

[0029] 5. The packaging machine provided by the present invention has any of the above advantages due to the use of the above bag opening mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A perspective view of a specific implementation of a bag opening mechanism provided in an embodiment of the present invention;

[0032] Figure 2 for Figure 1 An enlarged view of the end of the bag opening mechanism;

[0033] Figure 3 A perspective view of another specific embodiment of the bag opening mechanism provided in an embodiment of the present invention;

[0034] Figure 4 for Figure 3 An enlarged view of the end of the bag opening mechanism;

[0035] Figure 5 A perspective view of a specific embodiment of a packaging machine provided in an embodiment of the present invention;

[0036] Figure 6 for Figure 5 A three-dimensional view of the middle gripper module.

[0037] Description of reference numerals:

[0038] 1. First driving member; 2. Second driving member; 3. First connecting arm; 4. Second connecting arm; 5. Biasing member; 6. Limiting plate; 7. Baffle; 8. Detection device; 9. First bag opening nozzle; 10. Second bag opening nozzle; 11. Rotating arm; 12. Push rod; 13. Gear box; 14. Driving gear; 15. Clamping claw; 16. Packaging bag; 17. Driving shaft; 18. Blocking block; 19. First blocking point; 20. Second blocking point; 21. Driving handle; 22. Driving block. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] In the description of the present invention, 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 and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the present invention, 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 may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or 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 the present invention based on specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The bag opening mechanism provided in this embodiment can be used in a packaging machine, such as a food vacuum packaging machine.

[0044] like Figure 1As shown, a specific implementation of the bag opening mechanism provided in this embodiment includes: a driving clutch mechanism, a detection device 8 and several pairs of bag opening nozzles, the two bag opening nozzles in each pair are movably arranged on the frame, and are respectively used to adsorb the bag surfaces on both sides of the packaging bag 16; the driving clutch mechanism is arranged between the frame and at least one of the bag opening nozzles in each pair, and at least drives the bag opening nozzle to move back and forth in the direction of relatively approaching and moving away from the other bag opening nozzle, and a clutch is provided between it and the driven bag opening nozzle; when the driven bag opening nozzle is subject to the constraint force of the bag opening, the clutch separates the driving clutch mechanism from the driven bag opening nozzle, so that the driven bag opening nozzle stops moving, and the driving clutch mechanism continues to move a certain distance in the direction of bag opening; the detection device 8 is arranged between the driven bag opening nozzle and the corresponding driving clutch mechanism to detect the relative movement between the two.

[0045] In the illustrated embodiment, a drive clutch mechanism is installed between each pair of bag opening nozzles and the frame, and each bag opening nozzle is equipped with a detection device 8 that cooperates with the corresponding drive clutch mechanism. By symmetrically arranging the bag opening nozzles, the problem of the packaging bag 16 being offset to one side during opening, which makes it difficult to install the subsequent filling mechanism, is avoided. In addition, as an alternative embodiment, one of the bag opening nozzles can be directly installed on the frame. Accordingly, the detection device 8 does not need to be installed on the bag opening nozzle. This is also feasible, but the subsequent filling mechanism will need to be offset accordingly.

[0046] In addition, the driving clutch mechanism described in this embodiment can be driven by a driving member to engage or disengage, or can be automatically engaged or disengaged through a mechanical structure, for example, by detecting through a force measuring element, and when conditions are met, the driving clutch operation is performed through a driving device.

[0047] The bag opening mechanism provided in this embodiment drives a pair of bag opening nozzles by driving a clutch mechanism. During the bag opening process, the bag opening nozzle is restrained by the force when the bag opening of the packaging bag 16 is opened, causing the clutch mechanism therein to produce transmission separation. The restraining force simultaneously stops the bag opening nozzle from moving, while the driving member in the driving clutch mechanism continues to move a certain distance in the direction of bag opening. The relative movement between the bag opening nozzle and the driving member in the driving clutch mechanism is detected by the detection device 8, thereby determining whether there is a packaging bag 16 and whether the bag opening is successful. Specifically, when opening the bag, when the detection device 8 detects that there is no relative movement between the bag opening nozzle and the driving member in the driving clutch mechanism, it is judged that the bag opening nozzle has not sucked onto the bag surface and is subject to the constraint force of the bag opening, so that no packaging bag 16 is in place at this position. When it is detected that there is relative movement between the bag opening nozzle and the driving member in the driving clutch mechanism, it is judged that the packaging bag 16 is delivered to the position. On this basis, when the two clamping jaws 15 clamping the two ends of the bag opening of the packaging bag 16 move closer to each other to open the bag and the bag opening is completed, the constraint force of the bag opening of the packaging bag 16 disappears, and the bag opening nozzle is driven by the reset component in the clutch mechanism to return to its original position with the driving member in the driving clutch mechanism. After the detection device 8 detects that the relative movement between the bag opening nozzle and the driving clutch mechanism is reset, it is judged that the bag opening is successful.

[0048] In a typical structure where a pair of bag opening nozzles are symmetrically arranged, the clutch mechanism needs to drive the driven bag opening nozzles to separate with a force greater than the force of attraction between the two bag opening nozzles. At the same time, the difference between the above-mentioned mutual attraction force and the bag opening constraint force needs to be carefully set and the separation force threshold adjusted accordingly. Figure 1 In the bag opening mechanism provided in this embodiment, the two bag opening nozzles are offset when positioned near the surface of the packaging bag 16. This means that even when the packaging bag 16 is not present, the two bag opening nozzles will not exert a force on each other when they are in contact. This arrangement avoids the problem of the two bag opening nozzles being attracted to each other and unable to open the bag when the packaging bag 16 is not present. It also eliminates the need to carefully adjust the separation force threshold based on the difference between the aforementioned mutual attraction force and the bag opening restraining force, thereby avoiding the problem of false detection of the delivery of the packaging bag 16.

[0049] like Figure 1 、 Figure 2As shown, in the bag opening mechanism provided in this embodiment, the driving clutch mechanism has a driving member movably mounted on a frame, and the driven bag opening nozzle is movably mounted on the driving member. It should be noted that the above-mentioned movement of the bag opening nozzle and the driving member is relative to the frame. In other words, the driving member is movable relative to the frame, thereby allowing the bag opening nozzle to also move relative to the frame. Specifically, the clutch is disposed between the driving member and the driven bag opening nozzle. The clutch has a separation force threshold, which is less than the restraining force exerted on the bag opening of the two clamping jaws 15 that clamp the two ends of the bag opening of the packaging bag 16 and transport the packaging bag 16 to the bag opening station before the two jaws 15 move closer to each other to cooperate in bag opening. That is, after the pair of jaws 15 clamp the ends of the bag opening of the packaging bag 16 and transport it to the bag opening station, when the bag opening of the packaging bag 16 is opened in this state, the bag opening of the packaging bag 16 will exert a restraining force on the bag opening due to the tension. This restraining force is greater than the disengagement threshold of the clutch. As a result, if the pair of jaws 15 do not move toward each other simultaneously during bag opening, the clutch will reach the disengagement threshold, causing the driving clutch mechanism to disengage from the driven bag opening nozzle. In the specific operation process, when the bag is opened, the movement of the two jaws 15 toward each other lags behind the opening movement of the two bag opening nozzles. The disengagement threshold of the clutch is less than the restraining force exerted on the packaging bag 16 during the bag opening process, causing the two bag opening nozzles to stop moving, thereby causing relative displacement between them and the driving clutch mechanism, which is detected by the detection device 8.

[0050] like Figure 2 As shown, in the bag opening mechanism provided in this embodiment, the detection device 8 is fixedly arranged on the driving member near the bag opening nozzle. Specifically, the driving member is a driving rod, and a connecting arm is rotatably or slidably provided on the driving rod, and the bag opening nozzle is arranged at the free end of the connecting arm. The connecting arm moves on the driving rod, thereby driving the bag opening nozzle to adsorb the bag surface of the packaging bag 16. The detection device 8 is specifically a micro switch, and the micro switch is arranged on the driving rod and cooperates with the connecting arm. When the connecting arm moves relative to the driving rod, the micro switch can be triggered, so that the micro switch performs signal feedback. In addition, in some embodiments, the detection device 8 can also be other position detection devices 8, such as: displacement sensors, laser measuring instruments, etc. The driving member can also be other driving devices other than the driving rod, such as electric push rods, etc. Therefore, these are not restrictive.

[0051] like Figure 2As shown, in the bag opening mechanism provided in this embodiment, the clutch includes a biasing member 5 disposed between the driving member and the driven bag opening nozzle. The biasing member 5 applies a biasing force to the driven bag opening nozzle toward the direction of bag opening. Specifically, the biasing member 5 may be a spring or a torsion spring, and the clutch's separation force threshold is the elastic force of the spring's initial deformation. In other words, when the bag opening nozzle is attracted to the surface of the packaging bag 16 and the bag is opened, the biasing member 5 initially deforms. The elastic force generated by this deformation is the clutch's separation force threshold. This threshold is less than the restraining force of the packaging bag 16, preventing the bag opening nozzle from further opening the bag 16, thereby causing the bag opening nozzle to stop moving. When the pair of clamping jaws 15 that clamp the two ends of the bag opening of the packaging bag 16 approach each other, the restraining force on the bag opening nozzle disappears. Under the action of the biasing member 5, the bag opening nozzle moves relative to the driving member in the reset direction, thereby driving the bag opening of the packaging bag 16 to open the bag. When the bag is successfully opened, the bag opening nozzle is reset. At this time, the bag opening nozzle releases the trigger of the detection device 8, causing the detection device 8 to feedback a no-trigger signal, which is a signal of successful bag opening. Of course, the provision of the biasing member 5 is not restrictive. In some embodiments, the biasing member 5 can also be replaced by an active drive device, such as an active drive cylinder or electric push rod to drive the bag opening nozzle to reset relative to the drive member.

[0052] like Figure 2 As shown, in the bag opening mechanism provided in this embodiment, the driven bag opening nozzle is disposed on one end of a connecting arm and is rotatably mounted on the driving member via the connecting arm, with the spring acting between the driving member and the connecting arm. It should be noted that the spring may be a compression spring, which acts on the connecting arm to drive the connecting arm to reset in a lateral direction. In addition, in some embodiments, the spring may be a torsion spring, and the connecting arm may be slidably mounted on the driving member, etc. Therefore, these are not restrictive.

[0053] like Figure 2As shown, in the bag opening mechanism provided in this embodiment, the connecting arm is relatively fixedly connected to the limit plate 6, and the detection device 8 is arranged near the limit plate 6. In other words, the detection device 8 is used to detect the position of the connecting arm through the limit plate 6, thereby detecting the position of the bag opening nozzle on the connecting arm. Specifically, when the connecting arm rotates, it drives the limit plate 6 to move, thereby triggering the detection device 8 through the limit plate 6. Of course, this is not restrictive. In some embodiments, the limit plate 6 can be eliminated, and the position of the connecting arm can be directly detected by the detection device 8. Of course, in the specific embodiment in which the above-mentioned limit plate 6 is provided, a baffle is also fixedly provided on the driving member. When not subject to the restraining force of the bag opening, the limit plate 6 abuts against the baffle. Through this arrangement, the connecting arm can only rotate toward one side relative to the driving member. That is, when the driving member drives the bag opening nozzle to move toward the packaging bag 16, the limiting plate 6 on the connecting plate and the baffle 7 on the driving member block each other, preventing the bag opening nozzle from moving away from the packaging bag 16, thereby allowing the two opposing bag opening nozzles to stably absorb the two sides of the packaging bag 16. Of course, this is not restrictive. In some embodiments, the bag opening nozzle can also elastically move away from the packaging bag 16 while being absorbed toward the bag surface of the packaging bag 16. This configuration, that is, the packaging bag 16 is absorbed by elastic force, can ensure the safety of the connecting arm connected to the bag opening nozzle.

[0054] like Figure 2As shown, in the bag opening mechanism provided in this embodiment, a pair of bag opening nozzles are divided into a first bag opening nozzle 9 and a second bag opening nozzle 10. Correspondingly, the first bag opening nozzle 9 and the second bag opening nozzle 10 are movably mounted on the corresponding first driving member 1 and the second driving member 2 via their respective first connecting arms 3 and second connecting arms 4, respectively. In other words, the first bag opening nozzle 9 is mounted on the first connecting arm 3 and is movably mounted on the first driving member 1 via the first connecting arm 3, and the second bag opening nozzle 10 is mounted on the second connecting arm 4 and is movably mounted on the second driving member 2 via the second connecting arm 4. Specifically, the first connecting arm 3 and the second connecting arm 4 can be rotatably connected to the driving member or can be slidably connected to the driving member. With the above arrangement, when opening the bag, the first connecting arm 3 can move on the first driving member 1, thereby keeping the first bag opening nozzle 9 stationary relative to the packaging bag 16, and the second connecting arm 4 can move on the second driving member 2, thereby keeping the second bag opening nozzle 10 stationary relative to the packaging bag 16. With such arrangement, the detection device 8 can detect the movement of the first connecting arm 3 and the second connecting arm 4 relative to the driving member, thereby detecting the opening state of the packaging bag 16 .

[0055] like Figure 1 、 Figure 3 As shown, in the bag opening mechanism provided in this embodiment, the first driving member 1 and the second driving member 2 are two parallel driving rods. The first driving member 1 is provided with a plurality of first connecting arms 3 along the length of the rod, which intersects with the material conveying direction, and the second driving member 2 is provided with a plurality of second connecting arms 4 along the length of the rod. In other words, the parallel sliding movement of the first driving member 1 and the second driving member 2 simultaneously drives the plurality of first connecting arms 3 and second connecting arms 4 to cooperate with each other, thereby simultaneously opening a plurality of juxtaposed packaging bags 16. When applied to a packaging machine, this mechanism can improve the efficiency of conveying and filling vacuum packaging bags 16.

[0056] like Figure 1 、 Figure 3 As shown, in the bag opening mechanism provided in this embodiment, the first driving member 1 and the second driving member 2 are linked. When the first driving member 1 moves in a first direction, the second driving member 2 moves in the opposite direction. With this arrangement, a single driving mechanism can synchronously drive the two driving members. Specifically, the first driving member 1 and the second driving member 2 can be linked by a connecting rod or a gear rack.

[0057] like Figure 1 、 Figure 2As shown, when a connecting rod is used to link the first driving member 1 and the second driving member 2, a connecting rod mechanism can be provided at both ends of the first driving member 1 and the second driving member 2. The connecting rod mechanism includes: a rotating arm 11 rotatably provided on a frame, the rotating arm 11 having connecting portions extending in two directions, one of the connecting portions being rotatably connected to the first driving member 1, and the other being rotatably connected to the second driving member 2. When the rotating arm 11 is driven to rotate, the first driving member 1 and the second driving member 2 are linked in opposite directions. In addition, in this embodiment, the rotating arm 11 is further connected to a shift lever 12 extending toward one side. The shift lever 12 extends outside the frame. By driving the shift lever 12 to move back and forth outside the frame, the rotating arm 11 can be driven to rotate in a forward or reverse direction, thereby driving the first driving member 1 and the second driving member 2 to slide back and forth parallel to each other.

[0058] like Figure 3 、 Figure 4 As shown, when the first driving member 1 and the second driving member 2 are linked by a gear rack, a gear box 13 is installed at both ends of the first driving member 1 and the second driving member 2, and the extension sections of the first driving member 1 and the second driving member 2 slide into the gear box 13. The gear box 13 has a rotatable driving gear 14, and the parts of the first driving member 1 and the second driving member 2 that extend into the gear box 13 respectively have a rack structure that matches the driving gear 14, and the first driving member 1 and the second driving member 2 are simultaneously engaged with the driving gear 14 through the rack structure. When the driving gear 14 is driven forward or reverse, the first driving member 1 and the second driving member 2 are linked to slide parallel in opposite directions. In addition, as Figure 4As shown, in this embodiment, the drive shaft 17 of the drive gear 14 extends out of the gear box 13. By driving the drive shaft 17 to rotate forward or reverse outside the frame, the drive gear 14 can be driven to rotate forward or reverse, thereby driving the first drive member 1 and the second drive member 2 to slide back and forth parallel to each other. Specifically, a blocking block 18 is connected to the drive shaft 17, and the blocking block 18 has two blocking points set at an interval. The end of the drive shaft 17 is rotatably connected to a drive handle 21, and the drive handle 21 is connected to a drive block 22, and the drive block 22 is located between the two blocking points of the blocking block 18. Through the rotation of the drive handle 21, the drive block 22 is respectively matched with the two blocking points of the blocking block 18; for example, when the drive handle 21 is rotated, the drive block 22 on the drive handle 21 is matched with the first blocking point 19 of the blocking block 18 to drive the drive shaft 17 to rotate in the first direction, so that the two matched bag opening nozzles are respectively sucked toward the two side bag surfaces of the packaging bag 16; when the drive handle 21 is rotated, the drive block 22 on the drive handle 21 is matched with the second blocking point 20 of the blocking block 18 to drive the drive shaft 17 to rotate in the second direction, so that the two matched bag opening nozzles are respectively moved away from each other, thereby opening the bag mouth of the packaging bag 16.

[0059] In addition, in this embodiment, the blocking block 18 is further connected to an elastic member, which has an elastic force to drive the driving shaft 17 to rotate so that the two matching bag opening nozzles can open the packaging bag 16 . By this arrangement, the packaging bag 16 can be opened twice during operation; that is, when it is necessary to drive the two matching bag opening nozzles to suck the two side bag surfaces of the packaging bag 16, the driving handle 21 is rotated to make the driving block 22 cooperate with the first blocking point 19 to drive the driving shaft 17 to rotate in the first direction, thereby driving the two matching bag opening nozzles to suck; when it is necessary to drive the two matching bag opening nozzles to open the two side bag surfaces of the packaging bag 16, the driving handle 21 is first rotated to make the driving block 22 disengage from the first blocking block 18, so that the driving shaft 17 rotates in the second direction opposite to the first direction under the action of the elastic member. At this time, since the two ends of the bag opening of the packaging bag 16 are clamped by the clamping claw module so that the bag opening is in a taut state, only the first driving member 1 and the second driving member 2 can slide relative to each other under the action of the elastic member. This process is completed under the elastic force of the elastic member and can be carried out relatively slowly, thereby avoiding the problem of the bag opening nozzles sucked on both sides of the packaging bag being detached from the packaging bag due to the bag opening action being too fast. Then, the clamping jaws 15 at both ends of the bag opening of the packaging bag 16 are driven to move closer to each other to cooperate in opening the bag. Since the above-mentioned action of opening the packaging bag is driven by the elastic member, the time control of the cooperation action can be looser when the clamping jaws are driven to cooperate. After the bag opening of the packaging bag is loosened by the cooperation action of the clamping jaws, the driving handle 21 can be rotated to make the driving block 22 cooperate with the second blocking point 20, and the driving shaft 17 is rotated in the second direction, thereby completing the complete bag opening. The setting of this action is to improve the success rate of bag opening. When only the elastic member is used to drive the driving shaft 17 to rotate in the direction of the bag opening action, the elastic member may fail as the use time increases. Thereafter, the second bag opening action can be completed by rotating the driving handle 21.

[0060] Of course, the above embodiment is merely an example of a specific embodiment in which the first driving member 1 and the second driving member 2 are linked. In some embodiments, the first driving member 1 and the second driving member 2 may not be linked, and a separate driving mechanism may be provided on each of the first driving member 1 and the second driving member 2. Therefore, the above embodiment is not restrictive.

[0061] In addition, this embodiment also provides a packaging machine, such as Figure 5As shown, the machine comprises a conveying mechanism having a conveying frame, on which the bag opening mechanism described in the above-mentioned embodiment is mounted. Specifically, a conveying device is mounted within the conveying frame, to which a gripper module is connected. The conveying device is used to transport the gripper module to multiple workstations, including a bag opening station, where the bag opening mechanism is used to open the opening of the packaging bag 16. In other words, by placing the bag opening mechanism described in this embodiment at the bag opening station of the packaging machine, during operation, the bag opening mechanism is used to open the opening of the packaging bag 16 being conveyed by the conveying mechanism, thereby facilitating subsequent filling.

[0062] How it works

[0063] like Figure 1 As shown, the bag opening mechanism provided in this embodiment, when opening the bag, first the first driving member 1 and the second driving member 2 slide relative to each other, thereby driving the first bag opening suction nozzle 9 and the second bag opening suction nozzle 10 to be sucked onto the bag surfaces on both sides of the packaging bag 16.

[0064] Then, the first driving member 1 and the second driving member 2 slide in opposite directions, causing the first bag opening nozzle 9 and the second bag opening nozzle 10 to move in opposite directions, thereby opening the bag 16. However, during this process, since both sides of the bag opening of the bag 16 are clamped by the clamping jaws 15, the bag opening is in a taut state. The taut bag opening exerts a restraining force on the bag opening process, resulting in the first bag opening nozzle 9 and the second bag opening nozzle 10 being unable to move further away from each other after the bag opening of the bag 16 is opened to a certain position, even if the first bag opening nozzle 9 and the second bag opening nozzle 10 are stationary relative to the bag 16. During this process, the first driving member 1 and the second driving member 2 continue to move relative to each other, causing the first connecting arm 3 connected to the first bag opening nozzle 9 to move relative to the first driving member 1, and causing the second connecting arm 4 connected to the second bag opening nozzle 10 to move relative to the second driving member 2, thereby being detected by the detection device 8 respectively cooperating with the first connecting wall and the second connecting arm 4. The detection device 8 feeds back a detection signal, indicating that there is a packaging bag 16 between the two bag opening nozzles.

[0065] Then, if Figure 6As shown, the tension on the opening of the packaging bag 16 can be released by driving the pair of clamping jaws 15 that clamp the two ends of the bag opening closer together, that is, releasing the restraining force of the packaging bag 16 on the pair of bag opening nozzles. At this time, the first connecting arm 3 on the first bag opening nozzle 9 is reset under the action of the biasing member 5, and the second connecting arm 4 of the second bag opening nozzle 10 is also reset under the action of the biasing member 5, thereby continuing to open the bag opening of the packaging bag 16. When the bag opening of the packaging bag 16 is fully opened, the first connecting arm 3 is reset to the initial position relative to the first driving member 1, and the second connecting arm 4 is reset to the initial position relative to the second driving member 2. The detection device 8 that cooperates with the first connecting arm 3 and the second connecting arm 4, respectively, is de-triggered, thereby feeding back a detection signal indicating that the packaging bag 16 between the two bag opening nozzles has been successfully opened.

[0066] During the bag opening process, if there is no packaging bag 16, the first bag opening nozzle 9 and the second bag opening nozzle 10 will not generate suction when they are attracted to each other. During the bag opening process, the first connecting arm 3 and the second connecting arm 4 will move away from each other. During this process, due to the lack of the restraining force of the packaging bag 16, the first connecting arm 3 will not rotate relative to the first driving member 1, and thus the detection device 8 will not be triggered. In other words, during the bag opening process, if the detection device 8 is not triggered, it is determined that there is no packaging bag 16; if the detection device 8 is triggered and then deactivated, it is determined that there is a packaging bag 16 and the bag opening is successful.

[0067] In addition, when there is a packaging bag 16 but the bag opening of the packaging bag 16 cannot be successfully opened due to adhesion, the detection device 8 is triggered first and then will not be de-triggered. At this time, it is determined that the bag opening is not successful.

[0068] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications derived therefrom remain within the scope of protection of the present invention.

Claims

1. A bag opening mechanism, comprising: At least one pair of bag opening suction nozzles, wherein the two bag opening suction nozzles in each pair are movably arranged on the frame and are used to suck the bag surfaces on both sides of the packaging bag (16); It is characterized by further comprising: a driving clutch mechanism, disposed between the frame and at least one of the pairs of bag opening nozzles, and driving at least the bag opening nozzle to reciprocate in a direction relatively approaching and away from the other bag opening nozzle, and provided with a clutch between the driving clutch mechanism and the driven bag opening nozzle; when the driven bag opening nozzle is constrained by the bag opening opening force, the clutch decouples the driving clutch mechanism from the driven bag opening nozzle, causing the driven bag opening nozzle to stop moving, while the driving clutch mechanism continues to move a certain distance in the bag opening direction; The detection device (8) is arranged between the driven bag opening nozzle and the corresponding driving clutch mechanism to detect the relative movement between the two.

2. The bag opening mechanism according to claim 1, characterized in that: In a state close to the surface of the packaging bag (16), the two bag opening suction nozzles are staggered.

3. The bag opening mechanism according to claim 2, characterized in that: The driving clutch mechanism comprises a driving member movably arranged on a frame, and the driven bag opening nozzle is movably mounted on the driving member; the clutch is arranged between the driving member and the driven bag opening nozzle; the clutch has a separation force threshold, and the separation force threshold is smaller than the restraining force to which the bag opening of the packaging bag (16) is subjected before the two clamping jaws (15) clamping the two ends of the bag opening of the packaging bag (16) and conveying the packaging bag (16) to the bag opening station move closer to each other to cooperate in bag opening.

4. The bag opening mechanism according to claim 3, characterized in that: The detection device (8) is fixedly arranged on the driving member near the bag opening nozzle.

5. The bag opening mechanism according to claim 3, characterized in that: The clutch has a biasing member (5) arranged between the driving member and the driven bag opening nozzle, and the biasing member (5) applies a biasing force to the driven bag opening nozzle in a direction toward opening the bag.

6. The bag opening mechanism according to claim 5, characterized in that: The biasing member (5) is a spring, and the separation force threshold is the elastic force at which the spring starts to deform.

7. The bag opening mechanism according to claim 6, characterized in that: The driven bag opening nozzle is arranged on one end of a connecting arm and is rotatably arranged on the driving member through the connecting arm. The spring acts between the driving member and the connecting arm.

8. The bag opening mechanism according to claim 7, characterized in that: The connecting arm is relatively fixedly connected to the limiting plate (6), and the detection device (8) is arranged close to the limiting plate (6).

9. The bag opening mechanism according to claim 8, characterized in that: A baffle is fixedly provided on the driving member, and when there is no restraining force for opening the bag opening, the limiting plate (6) abuts against the baffle.

10. The bag opening mechanism according to any one of claims 7 to 9, characterized in that: The pair of bag opening nozzles are divided into a first bag opening nozzle (9) and a second bag opening nozzle (10). Correspondingly, the first bag opening nozzle (9) and the second bag opening nozzle (10) are movably mounted on the corresponding first driving member (1) and the second driving member (2) via their respective first connecting arms (3) and second connecting arms (4).

11. The bag opening mechanism according to claim 10, characterized in that: The first driving member (1) and the second driving member (2) are two driving rods arranged in parallel; a plurality of first connecting arms (3) are sequentially arranged on the first driving member (1) along the length direction of the rod intersecting with the material conveying, and a plurality of second connecting arms (4) are sequentially arranged on the second driving member (2) along the length direction.

12. The bag opening mechanism according to claim 11, characterized in that: The first driving member (1) and the second driving member (2) are linked and connected; when the first driving member (1) moves in a first direction, the second driving member (2) moves in an opposite direction.

13. A packaging machine, characterized in that: include: A conveying mechanism, the conveying mechanism comprising a conveying frame, the conveying frame being provided with the bag opening mechanism according to any one of claims 1 to 12; A conveying device is provided in the conveying frame, and a clamping module is connected to the conveying device. The conveying device is used to convey the clamping module to a plurality of workstations, including a bag opening workstation, at which the bag opening mechanism is used to open the opening of the packaging bag (16).

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