Bag opening and supporting device of packaging machine

Abstract

The utility model discloses a bag opening and supporting device of a packing machine, which comprises a rack, a bag opening device and a bag supporting device, the bag opening device comprises a bag clamping hand and a bag opening cylinder, the bag opening cylinder is connected to the bag clamping hand, the bag clamping hand comprises a supporting plate and a bag clamping cylinder, the bag clamping cylinder is connected to a position corresponding to the supporting plate, and the bag clamping cylinder is connected to the rack. The bag clamping hands are arranged in two groups, at least one group of bag clamping hands is connected with the bag opening air cylinder, the bag supporting device comprises a lifting mechanism, a left supporting plate and a right supporting plate, and the left supporting plate and the right supporting plate are further connected with supporting plate air cylinders. Compared with the prior art, the bag opening device has the function of clamping a packaging bag to prevent the packaging bag from falling off, the bag supporting device reduces friction resistance between the left supporting plate and the packaging bag and between the right supporting plate and the packaging bag, and the bag opening device and the bag supporting device support each other, so that the packaging bag is in a stable loading state.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of bagging device of packing machine. BACKGROUND

[0002] The packing machine described in the utility model is used to pack plastic bags produced by bag-making machine into packing bags row by row, to realize automatic packaging of plastic bags.

[0003] The authorized publication number CN221394380U discloses a bagging device, which includes a bag supporting device and a lifting supporting plate device. The bag supporting device includes a supporting plate and a bag supporting cylinder. The bag supporting cylinder is connected to the supporting plate. The bag supporting device is used to first put a packing bag on the two groups of supporting plates, then drive one group of supporting plates to move by the bag supporting cylinder, so that the two groups of supporting plates move relative to each other to open and tighten the bag opening of the packing bag, and finally hang the packing bag on the two groups of supporting plates to facilitate the packing of plastic bags. However, the bag supporting device has the following problems: after the plastic bags are packed into the packing bag layer by layer, it is difficult to maintain the hanging state of the packing bag only by the friction between the supporting plate and the packing bag as the weight gradually increases. When the weight of the packed plastic bags increases to a certain value, the packing bag is easily separated from the supporting plate, which seriously affects the working procedure of the bagging machine. If the opening force of the supporting plate is increased, the packing bag is easily torn by the supporting plate. The lifting supporting plate device of the prior art includes a supporting plate and a lifting mechanism. The supporting plate includes a left supporting plate and a right supporting plate, and a supporting plate seat. The left supporting plate and the right supporting plate are respectively slidably arranged on the supporting plate seat. The left supporting plate and the right supporting plate are respectively connected to a second cylinder. The supporting plate is connected to the lifting mechanism. However, the bag supporting device has the following problems: when the packing bag is full, the left supporting plate and the right supporting plate move to both sides under the drive of the second cylinder. Because the bottom of the packing bag containing plastic bags is pressed on the supporting plate, the resistance between the supporting plate and the packing bag is large during the movement, which easily pulls the packing bag to the left side or the right side, and easily pulls the packing bag down from the supporting plate. The packing bag pulled down will be dumped on the left supporting plate or the right supporting plate, which will seriously affect the packaging work. Even if the bag opening position of the packing bag is fixed on the supporting plate, the position of the packing bag below the supporting plate will be torn. Therefore, the lifting supporting plate device also affects the reliability and stability of the bag supporting device. For the plastic bag packing machine, the bag supporting work and the bag supporting work are inseparable and interdependent. The bag supporting device and the bag supporting device are both used to form an opening and supporting state of the packing bag to facilitate the packing of plastic bags. Therefore, the bag supporting device and the bag supporting device belong to an overall technical solution for the plastic bag packing machine. SUMMARY

[0004] To solve the problems in the prior art, the utility model provides a bag supporting device and a low-friction bag supporting device with a bag clamping function to solve the technical problems that a packaging bag is prone to falling off and tearing from the supporting plate and to provide a bag supporting device for a packaging machine.

[0005] To achieve the above technical purpose, the utility model discloses a technical scheme of a bag supporting device for a packaging machine, which comprises a rack, a bag supporting device and a bag supporting device.

[0006] The bag supporting device for a packaging machine can support the bottom of the packaging bag and move downward intermittently to reduce the drop of the plastic bag, prevent the plastic bag from being in a disordered state due to a large drop, and facilitate the loading of the plastic bag into the packaging bag layer by layer.

[0007] As a preferred technical scheme, the rack is further provided with a bag supporting guide rail, a bag supporting sliding block and a connecting plate.

[0008] The other group of bag clamping hands can be fixedly arranged on the rack or the bag supporting guide rail.

[0009] The bag clamping cylinder can be connected to the connecting plate, the bag supporting sliding block or the clamping plate to form a clamping area between the bag clamping cylinder and the clamping plate to clamp the bag opening.

[0010] As a further improvement, the bag clamping hand is also provided with a pre-clamping mechanism. When the existing packaging machine hangs the packaging bag on the supporting plate, the front part of the bag opening is hung on the front group of bag clamping hands, and then the rear part is hung on the rear group of bag clamping hands. At this time, the front part of the packaging bag is easy to slip off the bag clamping hand, resulting in time-consuming and laborious replacement of the packaging bag. After the pre-clamping mechanism is set, the front part of the packaging bag can be clamped between the pre-clamping mechanism and the supporting plate in advance, and then the rear part is easily hung on the rear group of bag clamping hands, saving time and effort. It should be noted that the packaging bag of the utility model comprises a nylon woven bag, and the woven bag is formed by two pieces of sheet-shaped sewing. When the woven bag is hung on the supporting plate by hand, the situation is not correct, and in most cases, the left and right sides of the packaging bag need to be held and pulled to adjust the packaging bag. Then the bag clamping cylinder can press on the supporting plate. If the bag clamping cylinder is used to press the packaging bag on the supporting plate first, it is not easy to adjust, especially when the needle is provided. Although the pre-clamping mechanism has a certain resistance to adjusting the packaging bag after being set, the clamping force of the pre-clamping mechanism is relatively small. As long as the empty packaging bag opening can be clamped, the resistance is small when moving in the left and right directions, and basically will not affect the adjustment work.

[0011] As a preferred technical solution, the pre-clamping mechanism comprises a cylinder or an elastic clamp. The elastic clamp is an elastic plate bent from an elastic steel sheet.

[0012] As a preferred technical solution, the bag clamping cylinder is also connected with a clamping jaw. When the packaging bag is close to full, its weight is relatively large, and it is inevitable to slide downward from the supporting plate. Even if it slides down a little, it is easy to increase the lateral force on the cylinder rod of the bag clamping cylinder, which affects the service life of the bag clamping cylinder. After the clamping jaw is connected to the bag clamping cylinder, the structural relationship is fundamentally changed. The clamping jaw can be hinged to the supporting plate, and the cylinder rod of the bag clamping cylinder is hinged to the clamping jaw. This design greatly reduces the lateral force on the bag clamping cylinder, thereby prolonging the service life of the bag clamping cylinder.

[0013] As a preferred technical solution, the supporting plate is also provided with a through hole, and a needle is arranged at the position corresponding to the through hole of the bag clamping cylinder or the clamping jaw.

[0014] This design, while the bag clamping cylinder clamps the bag opening of the packaging bag to the supporting plate, the needle will penetrate the packaging bag and extend into the through hole of the supporting plate, which can reliably clamp the bag opening of the packaging bag. After the needle installed on the bag clamping cylinder penetrates into the through hole of the supporting plate, it can play the positioning role of the positioning pin and the positioning hole, and can limit the up-down swing range of the cylinder rod of the bag clamping cylinder, which is also not negligible for prolonging the service life of the bag clamping cylinder.

[0015] The supporting plate cylinder can be a common single-rod telescopic cylinder, a swing cylinder or a drawbag cylinder, which is used to drive the left and right supporting plates to move leftward and rightward or to swing up and down.

[0016] The left and right supporting plates are in two working states of separation and combination under the driving of the supporting plate cylinder. In the "closed" state, the left and right supporting plates form a lifting platform. After a row of plastic bags is loaded into the packaging bag, the left and right supporting plates are lowered by a height of a row of plastic bags, so that the plastic bags are stacked into the packaging bag layer by layer. After being filled, the left and right supporting plates are "separated" under the driving of the supporting plate cylinder, and a space sufficient for the packaging bag to fall into is formed between the left and right supporting plates, so that the packaging bag falls. The left and right supporting plates can also move to both sides or swing up and down.

[0017] As a preferred technical solution, the lifting mechanism is provided with a swing mechanism, and the left and right supporting plates are connected to the swing mechanism. In this design, the left and right supporting plates can swing downward at the same time, so that a space sufficient for the packaging bag to fall into is formed between the left and right supporting plates. The greatest advantage is that the friction between the left and right supporting plates and the packaging bag is small during the downward swinging of the left and right supporting plates, and the packaging bag is not pulled left and right.

[0018] The swing mechanism is a swing arm mechanism composed of a swing arm and a rotating shaft, or a gear and rack mechanism composed of a gear, a rack and a rotating shaft, and the left and right supporting plates are connected to the rotating shaft of the swing mechanism.

[0019] As another specific embodiment of the left and right supporting plates, the left and right supporting plates are respectively provided with left and right supporting rollers. In this design, the left and right supporting plates are used as supporting roller frames. When the left and right supporting rollers are arranged on the left and right supporting plates respectively, the left and right supporting rollers move leftward and rightward reciprocally when the left and right supporting plates move leftward and rightward reciprocally under the driving of the supporting plate cylinder. During the movement, the left and right supporting rollers roll with the packaging bag, which is a rolling friction. Compared with the sliding friction between the left and right supporting plates and the packaging bag in the prior art, the frictional resistance is greatly reduced. When the left and right supporting rollers move leftward and rightward, the packaging bag is not excessively pulled left and right. In this embodiment, the left and right supporting plates are equivalent to the supporting roller frames, and the supporting plate cylinder is equivalent to the supporting roller cylinder.

[0020] The lifting mechanism is used for driving the left and right supporting rollers to move up and down intermittently, and can be a chain transmission mechanism, an electric sliding table or an oil pressure lifter, and has various embodiments for selection.

[0021] The utility model discloses a beneficial effect is: first, the bag clamping hand of the utility model is on the basis of existing technology support plate increased bag clamping cylinder, and bag clamping cylinder can reliably clamp the multiple points of the bag opening position of packing bag on support plate, and compared with the mode of the existing technology that packing bag opening is supported tightly to both sides through support plate, not only can the bag opening of packing bag be supported, but also multiple positions of bag opening can be clamped by bag clamping hand, avoid the problem that packing bag falls down. Second, after packing bag is filled with plastic bag, can make the bag opening of packing bag automatic convergence, bring great convenience to manual package sealing, also can bring more convenient condition for automatic package sealing work. Third, even if the bag supporting device can firmly clamp the packing bag, but if the packing bag is easily torn under the condition that the lower bag supporting device pulls the packing bag left and right, compared with the prior art, the bag supporting device of the utility model reduces the friction resistance between the supporting plate and the packing bag, reduces the pulling force of the left supporting plate and the right supporting plate when moving to both sides, so that the packing bag is not pulled off from the bag supporting mechanism or the packing bag is not pulled and torn. In conclusion, the bag supporting device and the bag supporting device of the utility model support each other, and make the packing bag present a stable and reliable supporting and bag supporting state for the loading work of the packaging machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structural principle schematic drawing of example one;

[0023] Figure 2 It is the right side schematic drawing of the structural principle of example one;

[0024] Figure 3 It is the structural principle bottom view schematic drawing of the bag supporting device of example one;

[0025] Figure 4 It is the structural principle top view schematic drawing of the bag supporting device of example one;

[0026] Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 It is the working principle and working step schematic drawing of example one;

[0027] Figure 10 It is the structural principle schematic drawing of example two;

[0028] Figure 11 It is the right side schematic drawing of the structural principle of example two;

[0029] Figure 12 is the structural principle schematic diagram of example three;

[0030] Figure 13 、 Figure 14 is the working principle and working step schematic diagram of example three.

[0031] In the figure: 1--frame; 2--bag supporting device; 21--bag clamping hand; 211--supporting plate; 212--bag clamping cylinder; 213--needle; 214--punching hole; 22--connecting plate; 23--bag supporting cylinder; 24--bag supporting guide rail; 25--bag supporting sliding block; 26--claw; 3--bag supporting device; 31--left supporting plate; 32--right supporting plate; 33--supporting plate cylinder; 34--left supporting roller; 35--right supporting roller; 36--lifting mechanism; 361--chain; 362--sprocket; 363--transmission shaft; 364--motor; 365--translation sliding block; 366--longitudinal sliding block; 367--longitudinal guide rail; 37--lifting seat; 368--translation guide rail; 39--oscillating mechanism; 391--rotation shaft; 392--swing arm; 393--gear; 394--rack; 395--sliding seat; 396--transverse translation guide rail; 397--transverse translation sliding block; 4--pre-clamping mechanism; 41--steel plate elastic clamp; 42--plunger elastic clamp; 43--pre-clamping cylinder; 5--packaging bag; 6--plastic bag. DETAILED DESCRIPTION

[0032] In order to further disclose the utility model, the technical scheme of the utility model is described in detail below by three examples combined with the drawings. In the technical scheme of the utility model, the left side of the front face Figure 1 of the utility model is the front face, Figure 2 and the left and right sides of the left and right faces of the utility model are the left and right faces.

[0033] Example one, as Figure 1 、 Figure 2 、 Figure 3The bag supporting device 2 of the first embodiment comprises bag clamping hands 21 and bag supporting cylinders 23 connected to the bag clamping hands 21. The bag clamping hand 21 comprises a supporting plate 211 and a bag clamping cylinder 212 connected to the corresponding position of the supporting plate 211. Two bag clamping hands 21 form a group, and there are two groups in total. The front two bag clamping hands 21 are connected to a connecting plate 22 to form a group, i.e. two bag clamping hands 21 form a group. The connecting plate 22 is connected to two bag supporting sliders 25, and the two bag supporting sliders 25 are respectively connected to two bag supporting guide rails 24. The rear two bag clamping hands 21 are fixedly arranged on the frame 1 to form a group. The bag clamping hand 21 is provided with a needle 213 and a hole 214. The front two bag clamping hands 21 are further provided with a pre-clamping mechanism 4, which is an elastic clamp 41. The bag supporting device 3 is arranged below the bag supporting device 2 and comprises a lifting mechanism 36, a left supporting plate 31, a right supporting plate 32, a bag supporting cylinder 33 connected to the left supporting plate 31 and the right supporting plate 32, a chain 361, a chain wheel 362, a transmission shaft 363, a motor 364, a longitudinal slider 366, a longitudinal guide rail 367, a lifting seat 37, a swing arm 392, and a rotating shaft 391. The left supporting plate 31 and the right supporting plate 32 are respectively connected to the rotating shaft 391, and the rotating shaft 391 is respectively hinged to the lifting seat 37.

[0034] As Figure 1 , Figure 2 , Figure 3As shown in the figure: two bag supporting rails 24 are installed on the upper part of the frame 1, and a square hole is arranged on the front part of the two bag supporting rails 24, corresponding to the position of the frame 1, which is penetrable up and down, and the length and width of the square hole are greater than the thickness and width of the plastic bag 6 after being filled with the packaging bag 5. A bag supporting slider 25 is installed on each of the two bag supporting rails 24. A rectangular flat plate is arranged as a connecting plate 22, and the left and right ends of the connecting plate 22 are installed on the two bag supporting sliders 25. A supporting plate 211 is installed on the inner side of the connecting plate 22 between the bottom surface of the connecting plate 22 and the two bag supporting rails 24. A bag clamping cylinder 212 is installed on the connecting plate 22 corresponding to the supporting plate 211. The bag clamping cylinder 212 is a guide rod cylinder. A needle 213 is installed on the guide rod seat of the bag clamping cylinder 212. A hole 214 is arranged on the supporting plate 211 corresponding to the needle 213. A steel plate elastic clamp 41 is designed with a steel plate, and the steel plate elastic clamp 41 is installed above the bag clamping cylinder 212 of each supporting plate 211. When the two bag clamping cylinders 212 are opened, the bag opening of the packaging bag 5 can be clamped on the supporting plate 211, so that two bag clamping hands 21 are formed. The bag supporting cylinder 23 is installed on the left and right middle positions of the connecting plate 22. The body of the bag supporting cylinder 23 is installed on the frame 1. When the bag supporting cylinder 23 is opened, it can drive the connecting plate 22 to move back and forth with a group of two bag clamping hands 21. Figure 1 As shown in the figure: a transmission shaft 363 is rotatably installed on the bottom of the frame 1. Two chain wheels 362 are installed on the transmission shaft 363. Two chain wheels 362 are also rotatably installed on the frame 1 corresponding to the two chain wheels 362 upward. Chain 361 is installed on the two chain wheels 362 respectively. Two longitudinal rails 367 are installed between the two chains 361. Longitudinal sliding blocks 366 are installed on the two longitudinal rails 367 respectively. A lifting seat 37 is installed on the longitudinal sliding blocks 366. The lifting seat 37 is a rectangular plate body. Two rotating shafts 391 are hingedly connected on the lifting seat 37, that is, bearings are installed on the lifting seat 37, and the rotating shafts 391 are installed on the bearings, so that the two rotating shafts 391 can rotate back and forth respectively. A left supporting plate 31 is installed on the left rotating shaft 391. A right supporting plate 32 is installed on the right device 391. The left supporting plate 31 and the right supporting plate 32 are plate bodies. A swing arm 392 is installed on the bottom position of the left supporting plate 31 and the right supporting plate 32 respectively. A supporting plate cylinder 33 is connected and installed on the swing arm 392 of the left supporting plate 31 and the right supporting plate 32 respectively. The other end of the two supporting plate cylinders 33 is hingedly connected on the lifting seat 37.

[0035] The working process of the first embodiment is as follows: as shown in the figure, the cylinder rods of the two supporting plate cylinders 33 are retracted in the initial state, and the lifting seat 37 of the bag supporting device 3 is at the upper position. Figure 4 As shown in the figure, the cylinder rods of the two supporting plate cylinders 33 are retracted in the initial state, and the lifting seat 37 of the bag supporting device 3 is at the upper position. Figure 5As shown: the front position of the bag opening of the packaging bag 5 is pushed up by hand between the steel elastic clamp 41 of the pre-clamping mechanism 4 and the support plate 211, then the support bag cylinder 23 drives the connecting plate 22 and the support bag slider 25, the support plate 211 and the clamp bag hand 21 of the clamp bag cylinder 212 together along the support bag guide rail 24 to move backward, forming the state as shown Figure 5 As shown: the front position of the bag opening of the packaging bag 5 is pushed up by hand between the steel elastic clamp 41 of the pre-clamping mechanism 4 and the support plate 211, then the support bag cylinder 23 drives the connecting plate 22 and the support bag slider 25, the support plate 211 and the clamp bag hand 21 of the clamp bag cylinder 212 together along the support bag guide rail 24 to move backward, forming the state as shown Figure 6 As shown: the front position of the bag opening of the packaging bag 5 is pushed up by hand between the steel elastic clamp 41 of the pre-clamping mechanism 4 and the support plate 211, then the support bag cylinder 23 drives the connecting plate 22 and the support bag slider 25, the support plate 211 and the clamp bag hand 21 of the clamp bag cylinder 212 together along the support bag guide rail 24 to move backward, forming the state as shown Figure 7 As shown: the front position of the bag opening of the packaging bag 5 is pushed up by hand between the steel elastic clamp 41 of the pre-clamping mechanism 4 and the support plate 211, then the support bag cylinder 23 drives the connecting plate 22 and the support bag slider 25, the support plate 211 and the clamp bag hand 21 of the clamp bag cylinder 212 together along the support bag guide rail 24 to move backward, forming the state as shown Figure 8 As shown: the front position of the bag opening of the packaging bag 5 is pushed up by hand between the steel elastic clamp 41 of the pre-clamping mechanism 4 and the support plate 211, then the support bag cylinder 23 drives the connecting plate 22 and the support bag slider 25, the support plate 211 and the clamp bag hand 21 of the clamp bag cylinder 212 together along the support bag guide rail 24 to move backward, forming the state as shown Figure 9As shown, during the downward swing of the left support plate 31 and the right support plate 32, there is almost no friction or resistance between the left support plate 31 and the right support plate 32 and the packaging bag 5, so there will be no problem of pulling the packaging bag 5 to the left or right; then, the bag clamping cylinders 212 are released, the needles 213 are pulled out from the holes 214, and then the bag supporting cylinder 23 drives the front set of bag clamping hands 21 to move backward, and the packaging bag 5 slips off due to the loss of the supporting force. If it is necessary to seal the packaging bag 5 filled with plastic bags 6, do not release the bag clamping cylinder 212 first. Wait for the bag supporting cylinder 23 to open and drive the front set of bag clamping hands 21 to move backward so that the bag opening of the packaging bag 5 is closed front and back. Then use a sewing machine to sew the bag opening of the packaging bag 5. After the bag opening of the packaging bag 5 is sewn, release all the bag clamping cylinders 212. The needles 213 are pulled out from the holes 214 of the support plate 211. The packaging bag 5 filled with plastic bags 6 falls down. After falling, the packaging bag 5 is between the left support plate 31 and the right support plate 32, so it will not tip over. At this point, the bag supporting and supporting process of Embodiment 1 is completed.

[0036] Example 2, as Figure 10 , Figure 11 As shown: The main difference between Embodiment 2 and Embodiment 1 is that the swing mechanism 39 is a gear and rack mechanism; the pre-clamping mechanism 4 is a plunger elastic clamp 42; and the bag clamping cylinder 212 in Embodiment 2 is a common single-rod cylinder.

[0037] like Figure 10 , Figure 11 As shown: Two transverse guide rails 396 are installed on the lifting base 37, and a transverse slider 397 is installed on each transverse guide rail 396. A sliding seat 395 is provided, with a clearance notch in the middle of the sliding seat 395 to avoid two devices 391. The sliding seat 395 is installed on the transverse slider 397, and a support plate cylinder 33 is installed on the sliding seat 395. The tail end of the support plate cylinder 33 is installed on the lifting base 37. Two devices are installed on the lifting base 37, rotating left and right. A rotating shaft 391 has a gear 393 installed at its front end. A rack 394 is meshed with each of the two gears 393 on one side. The two racks 394 are mounted on sliding seats 395. A left support plate 31 and a right support plate 32 are installed on the left and right rotating shafts 391 respectively. Adjusting the meshing position of the gears 393 and racks 394 causes the cylinder rod of the support plate cylinder 33 to extend, causing the left support plate 31 and right support plate 32 to swing upwards, forming two platforms, as shown in the image. Figure 11 As shown, when the pallet cylinder 33 is released, the left pallet 31 and the right pallet 32 ​​simultaneously swing downwards until the gap between them is greater than the width of the packaging bag 5 after it is filled with plastic bags 6; Figure 10As shown: a telescopic sleeve is installed on the supporting plate 211 or the connecting plate 22, a spring is installed on the telescopic sleeve, a plunger is slidingly installed on one side of the spring, the end of the plunger corresponding to the supporting plate 211 is provided with a tapered surface, and under the elastic force of the spring, the tapered end of the plunger is pressed against the supporting plate 211. The other structures and installation modes of the second embodiment are the same as those of the first embodiment, and will not be described here.

[0038] The working process of the second embodiment is as follows: Figure 10 , Figure 11 As shown, when the front bag opening position of the packaging bag 5 is lifted upward along the supporting plate 211, the bag opening of the packaging bag 5 will generate a leftward moving thrust on the plunger tapered surface of the plunger elastic clamp 42, which can overcome the elastic force of the spring to form an elastic gap between the plunger and the supporting plate 211, so that the bag opening position of the packaging bag 5 is inserted, and after being inserted, the bag opening position of the packaging bag 5 is clamped by the plunger of the plunger elastic clamp 42 on the supporting plate 211; when the supporting plate cylinder 33 is opened, the cylinder rod drives the sliding seat 395 to move leftward in the process, the upper and lower racks 394 respectively engage the left shaft 391 and the right shaft 391 to rotate relatively, so that the left supporting plate 31 and the right supporting plate 32 installed on the two shafts 391 swing upward at the same time to form two horizontal planes, which hold the part of the packaging bag 5 containing the plastic bags 6, and the lower part of the packaging bag 5 containing the plastic bags 6 is between the left supporting plate 31 and the right supporting plate 32; when the packaging bag 5 is filled with plastic bags 6, the supporting plate cylinder 33 is released, the sliding seat 395 moves rightward to reset, and the left supporting plate 31 and the right supporting plate 32 swing downward at the same time, and the gap between them is greater than the width of the packaging bag 5. In the process of swinging downward, the left supporting plate 31 and the right supporting plate 32 hardly generate friction and resistance with the packaging bag 5, so there is no problem of pulling the packaging bag 5 leftward or rightward. The other working processes and steps of the second embodiment are basically the same as those of the first embodiment.

[0039] The third embodiment is as shown in Figure 12 , Figure 13 , Figure 14 The difference between the third embodiment and the first embodiment is that the left supporting roller 34 is arranged on the left supporting plate 31, and the right supporting roller 35 is arranged on the right supporting plate 32. From the aspect of function and effect, the left supporting plate 31 and the right supporting plate 32 of the original first embodiment are equivalent to a supporting roller frame; the pre-clamping mechanism 4 of the third embodiment is a cylinder 43; the clamping jaw 26 is further connected to the bag clamping cylinder 212 of the third embodiment, and the needle 213 is arranged on the clamping jaw 26.

[0040] As shown in Figure 12As shown: Two translation guide rails 368 are installed on the lifting base 37. A translation slider 365 is installed on each translation guide rail 368. A left support plate 31 and a right support plate 32 are installed on the translation slider 365. A left support roller 34 is installed on the left support plate 31, and a right support roller 35 is installed on the right support plate 32. A support plate cylinder 33 is installed on each of the left and right support plates 31 and 32. The tails of the two support plate cylinders 33 are respectively installed on the lifting base 37. A gripper 26 is hinged to the upper part of each support plate 211. A bag clamping cylinder 212 is connected to the lower middle part of the gripper 26. The tail of the bag clamping cylinder 212 is connected to the frame 1 or the connecting plate 22. A threading needle 213 is installed at the lower end of the gripper 26. A pre-clamping cylinder 43 is installed below the connecting plate 22. The pre-clamping cylinder 43 is a miniature cylinder.

[0041] The working process of Example 3 is as follows: Figure 13 , Figure 14 As shown, in the initial state, the cylinder rod of the pre-clamping cylinder 43 is retracted. After the front part of the packaging bag 5 is hooked onto the front set of support plates 211, the pre-clamping cylinder 43 opens to clamp the opening of the packaging bag 5 onto the support plates 211. Then, the rear part of the packaging bag 5 is hooked onto the rear set of support plates 211. Before the plastic bag 6 is inserted, both pallet cylinders 33 open to drive the left support roller 34 and the right support roller 35 to move towards the center. After the plastic bag 6 is inserted, the left and right sides of the packaging bag 5 are supported by the left support roller 34 and the right support roller 35. From the perspective of the right side, it forms a shape as shown in the image. Figure 14 As shown in the diagram, when the plastic bag 6 is filled with the packaging bag 5, the two pallet cylinders 33 are released simultaneously, creating a space between the left roller 34 and the right roller 35 that is larger than the width of the packaging bag 5, allowing the packaging bag 5 to fall. As the left roller 34 and the right roller 35 move to both sides at the same time, rolling friction is generated between the left roller 34 and the right roller 35 and the packaging bag 5. This greatly reduces the frictional resistance compared with the sliding friction of the prior art, thereby avoiding the problem of the packaging bag 5 being pulled left and right.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled in the art, the above-mentioned terms can be understood in the specific meaning of the utility model.

[0044] The above-mentioned utility model implementation mode does not constitute the limitation to the protection scope of the utility model. Any modification, equivalent replacement and improvement etc. within the spirit and principle of the utility model should be included in the claim protection scope of the utility model.

Claims

1. A bag opening and holding device of a packaging machine, comprising a frame (1), a bag opening device (2), a bag holding device (3), characterized in that: The bag supporting device (2) comprises bag clamping hands (21) and bag supporting cylinders (23), the bag clamping hand (21) comprises a supporting plate (211) and a bag clamping cylinder (212), the bag clamping cylinder (212) is connected at a position corresponding to the supporting plate (211), at least one group of bag clamping hands (21) is connected with the bag supporting cylinder (23), the bag supporting device (3) is arranged below the bag supporting device (2) and comprises a lifting mechanism (36), a left supporting plate (31) and a right supporting plate (32), the left supporting plate (31) and the right supporting plate (32) are connected to the lifting mechanism (36), and a supporting plate cylinder (33) is further connected to the left supporting plate (31) and the right supporting plate (32).

2. A bag opening and supporting device of a packaging machine according to claim 1, characterized in that: The bag supporting device (2) comprises bag clamping hands (21) and bag supporting cylinders (23), the bag clamping hand (21) comprises a supporting plate (211) and a bag clamping cylinder (212), the bag clamping cylinder (212) is connected at a position corresponding to the supporting plate (211), at least one group of bag clamping hands (21) is connected with the bag supporting cylinder (23), the bag supporting device (3) is arranged below the bag supporting device (2) and comprises a lifting mechanism (36), a left supporting plate (31) and a right supporting plate (32), the left supporting plate (31) and the right supporting plate (32) are connected to the lifting mechanism (36), and a supporting plate cylinder (33) is further connected to the left supporting plate (31) and the right supporting plate (32).

3. A bag opening and supporting device of a packaging machine according to claim 1, characterized in that: The bag clamping hand (21) is further provided with a pre-clamping mechanism (4).

4. A bag opening and supporting device of a packaging machine according to claim 3, characterized in that: The pre-clamping mechanism (4) comprises an elastic clamp (41) or a pre-clamping cylinder (43).

5. A bag opening and supporting device of a packaging machine according to claim 1, characterized in that: The bag clamping cylinder (212) is further connected with a clamping jaw (26).

6. A bag opening and supporting device of a packaging machine according to claim 5, characterized in that: The supporting plate (211) is further provided with a perforation (214), and a needle (213) is arranged at a position corresponding to the perforation (214) of the bag clamping cylinder (212) or the clamping jaw (26).

7. A bag opening and supporting device of a packaging machine according to claim 1, characterized in that: The lifting mechanism (36) is provided with a swing mechanism (39), and the left supporting plate (31) and the right supporting plate (32) are respectively connected to the swing mechanism (39).

8. A bag opening and holding device of a packaging machine according to claim 7, characterized in that: The swing mechanism (39) is a swing arm mechanism composed of a swing arm (392) and a rotating shaft (391), or a gear and rack mechanism composed of a gear (393), a rack (394) and a rotating shaft (391), and the left supporting plate (31) and the right supporting plate (32) are respectively connected to the rotating shaft (391) of the swing mechanism (39).

9. A bag opening and supporting device of a packaging machine according to claim 1, characterized in that: The left supporting plate (31) and the right supporting plate (32) are respectively provided with a left supporting roller (34) and a right supporting roller (35).

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