A bag opening device with upper and lower linkage for a bag feeding machine and its operation method

Abstract

The present invention discloses a bag opening device of a bag feeding machine with upper and lower linkage, comprising an upper suction cup mechanism, the upper suction cup mechanism comprising two groups of upper suction cups arranged oppositely, the two groups of upper suction cups being slidably arranged on an upper mounting base plate through a first rod and a second rod respectively; a lower suction cup mechanism, the lower suction cup mechanism comprising two groups of lower suction cups arranged oppositely, the two groups of lower suction cups being telescopically fixed on a third rod and a fourth rod; a driving mechanism, the driving mechanism comprising a cam driven by the bag feeding machine, the cam driving a bag opening connecting rod to move, the bag opening connecting rod being slidably connected to a bottom driving connecting rod, the bottom driving connecting rod being connected to a driving shaft, the driving shaft being connected to an upper driving rod and a lower driving rod, the driving shaft being installed between a bottom plate and a top plate, an adjusting screw rod being further arranged between the bottom plate and the top plate, the adjusting screw rod being connected to a nut seat fixed on the lower mounting base plate, and an air blowing pipe being arranged on the top plate. The device is designed with a combination of the same cam connecting rod mechanism, so that the actions of the upper and lower suction cups are fully matched, and the execution of the actions is compact and stable.

Description

Technical Field

[0001] The invention relates to the technical field of improved design of auxiliary mechanisms of bag feeding machines, and in particular to an upper and lower linked bag opening device of the bag feeding machine and an operating method thereof. Background Art

[0002] The bag opening and bag bottom devices of bag packaging machines on the existing market generally have a top group of suction cups for opening the top of the bag, which is controlled by a cam mechanism, and a bottom group of suction cups for completing the function of opening the bottom of the bag, which is controlled by a cylinder. The disadvantage of this structure is that if you want to open the bag well first, you need to use the top suction cup to suck open a hole first to allow air to come in first, and then the upper and lower suction cups move together to open the bag well. If the bottom suction cup moves before the top suction cup or moves with the top suction cup, when the main machine runs faster, the bag opening action is very fast and the bag opening time is very short, which will cause the air to not have time to enter the bag when opening the bag, resulting in negative pressure in the bag, and then the bag will not open or will not open large enough. When the main machine runs at different speeds or the air pressure is unstable, the matching of the cylinder and the cam may be different. If the matching is not perfect, the bag opening will be poor. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a bag opening device with upper and lower linkage for a bag feeding machine and an operation method thereof. Through the combined design of the same cam-link mechanism, the actions of the upper and lower suction cups are completely matched, and the execution action is compact and stable.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: a bag opening device of a bag feeding machine linked up and down, which is specially used for opening the bag mouth and the bag bottom of the bag on the bag feeding packaging machine, and comprises a top blowing mechanism, and the top blowing mechanism blows air to the bag mouth through a blowing pipe;

[0005] An upper suction cup mechanism, wherein the upper suction cup mechanism comprises two groups of upper suction cups arranged opposite to each other, the two groups of upper suction cups are slidably arranged on the upper mounting base plate through the first rod and the second rod respectively, and the two ends of the upper driving rod on the upper mounting base plate are respectively hinged to the first rod and the second rod through the upper connecting rod; a lower suction cup mechanism, wherein the lower suction cup mechanism comprises two groups of lower suction cups arranged opposite to each other, the two groups of lower suction cups are telescopically fixed on the third rod and the fourth rod, the third rod and the fourth rod are both slidably arranged on the lower mounting base plate, and the two ends of the lower driving rod on the lower mounting base plate are respectively hinged to the third rod and the fourth rod through the lower connecting rod;

[0006] The driving mechanism includes a cam for driving the bag machine, the cam drives the bag opening connecting rod to move, the bag opening connecting rod is slidably connected to the bottom driving connecting rod, the bottom driving connecting rod is connected to the driving shaft, the driving shaft is connected to the upper driving rod and the lower driving rod, the driving shaft is installed between the bottom plate and the top plate, and an adjusting screw rod is also provided between the bottom plate and the top plate, the adjusting screw rod is connected to a nut seat fixed on the lower mounting base plate, and an air blowing pipe is provided on the top plate.

[0007] The cam design has a total of 6 strokes, the first stroke occupies 100 degrees, at this time the suction cup group remains open and stationary, and the bag feeding machine sends the bag between the suction cup groups; the second stroke occupies 70 degrees, at this time the suction cup group moves from the farthest state to the closest state, and the inner and outer suction cups are combined; the third stroke occupies 35 degrees, at this time the suction cup group remains stationary, and the suction cup group is opened to vacuum; the fourth stroke occupies 50 degrees, and a small hole is opened at the top of the bag; the fifth stroke occupies 25 degrees, at this time the suction cup group remains in a stationary state with a small hole opened at the top of the bag, and air is blown from the top of the blowing pipe to let air enter the bag; the sixth stroke occupies 80 degrees, the suction cup group continues to move the second stroke, and the bag opens wider.

[0008] A fixing seat is installed on the top plate, the fixing seat is connected with the air blowing pipe via a fixing rod, and the fixing rod and the air blowing pipe are connected via a cross clamp.

[0009] The upper mounting base plate is provided with an upper slide rail, which connects the first rod and the second rod through a slider, and the ends of the first rod and the second rod are both connected to an upper fixing frame, which is connected to an upper suction cup through an upper connector.

[0010] The lower mounting base plate is provided with a lower sliding rail, which is connected to the third rod and the fourth rod through a slider, the ends of the third rod and the fourth rod are connected to the lower fixing frame, the lower fixing frame is connected to the lower suction cup through a lower connecting head, and a spring is also provided between the lower suction cup and the lower connecting head.

[0011] The lower mounting base plate is also provided with a bag feeding guide rod, the lower connecting head is provided with a long hole, the tube of the lower suction cup is locked with the long hole through a double nut, and the spring is installed between the suction nozzle outside the tube of the lower suction cup and the double nut.

[0012] The bag opening connecting rod is provided with a joint bearing, the end of the rod on the joint bearing is provided with a pin, the pin is slidably arranged in the long strip hole of the bottom driving connecting rod, and the driving shaft is connected to the bottom driving connecting rod through the bearing.

[0013] A support column is also arranged between the bottom plate and the top plate, the support column passes through the upper mounting base plate and the lower mounting base plate, and the adjusting screw rod is also connected to the hand wheel.

[0014] An operating method of a bag feeding machine's upper and lower linkage bag opening device comprises the following steps:

[0015] S1. Bag feeding process, the bag feeding machine transports the bags between the suction cup groups;

[0016] S2. The top of the bag is opened, and the cam drives the upper suction cup to open the vacuum to suck the bag, while the lower suction cup does not open the vacuum;

[0017] S3. Blowing process at the top of the bag, the blowing pipe blows air to the top of the bag, and the lower suction cup opens the vacuum;

[0018] S4. Bag moving process, the air blowing pipe stops blowing, the cam stroke is reset, and the bag feeding machine moves the bag out.

[0019] In the S2 process, when the cam completes the first stroke and the upper suction cup just sticks to the bag, the lower suction cup will collide with the bag and shrink elastically; in the S3 process, the cam continues to have the second stroke, at which time both the upper and lower suction cups suck the bag, and the top and bottom of the bag will be torn apart, thus completing the bag opening action; in the S4 process, the blowing tube is closed after the cam completes the second stroke.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the device uses the combined design of the same cam-link mechanism to make the movements of the upper and lower suction cups completely matched, and the execution of the movements is compact and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the top blowing mechanism of the present invention;

[0023] Figure 3 It is a schematic diagram of the upper suction cup mechanism of the present invention;

[0024] Figure 4 It is a schematic diagram of the lower suction cup mechanism of the present invention;

[0025] Figure 5 It is a schematic diagram of the driving mechanism of the present invention;

[0026] Figure 6 It is the cam stroke design diagram of the present invention.

[0027] The markings in the attached drawings are: 1. top blowing mechanism; 2. upper suction cup mechanism; 3. lower suction cup mechanism; 4. driving mechanism; 5. bag; 11. blowing pipe; 12. fixing rod; 13. fixing seat; 14. cross clamp; 21. upper suction cup; 22. upper fixing frame; 23. upper connecting head; 24. first rod; 25. second rod; 26. upper slide rail; 27. upper connecting rod; 28. upper driving rod; 29. ​​upper mounting base ; 30. Bag inlet guide rod; 31. Lower suction cup; 32. Lower fixing frame; 33. Lower connecting head; 34. Third rod; 35. Fourth rod; 36. Lower sliding rail; 37. Lower connecting rod; 38. Lower driving rod; 39. Lower mounting base plate; 41. Cam; 42. Bag opening connecting rod; 43. Bottom driving connecting rod; 44. Bottom plate; 45. Support column; 46. Top plate; 47. Handwheel; 48. Adjusting screw; 49. Driving shaft. DETAILED DESCRIPTION

[0028] The following is a detailed description with reference to the accompanying drawings in combination with the embodiments, so as to provide a more in-depth explanation of the technical features and advantages of the present invention.

[0029] like Figure 1-6 As shown, a bag opening device of a bag feeding machine of the present invention is a top-down linkage bag opening device, which is specially used for opening the bag opening and the bottom of the bag 5 on the bag feeding packaging machine, and comprises a top blowing mechanism 1, wherein the top blowing mechanism blows air toward the bag opening through a blowing pipe 11; an upper suction cup mechanism 2, wherein the upper suction cup mechanism comprises two groups of upper suction cups 21 arranged opposite to each other, wherein the two groups of upper suction cups are respectively slidably arranged on an upper mounting base plate 29 through a first rod 24 and a second rod 25, and the two ends of an upper driving rod 28 on the upper mounting base plate are respectively hinged to the first rod and the second rod through an upper connecting rod 27;

[0030] A lower suction cup mechanism 3, wherein the lower suction cup mechanism comprises two groups of lower suction cups 31 arranged opposite to each other, the two groups of lower suction cups are telescopically fixed on a third rod 34 and a fourth rod 35, the third rod and the fourth rod are both slidably arranged on a lower mounting base plate 39, and two ends of a lower driving rod 38 on the lower mounting base plate are respectively hinged to the third rod and the fourth rod through a lower connecting rod 37;

[0031] The driving mechanism 4 includes a cam 41 for driving the bag machine, the cam drives the bag opening connecting rod 42 to move, the bag opening connecting rod is slidably connected to the bottom driving connecting rod 43, the bottom driving connecting rod is connected to the driving shaft 49, the driving shaft is connected to the upper driving rod and the lower driving rod, the driving shaft is installed between the bottom plate 44 and the top plate 46, and an adjusting screw 48 is also provided between the bottom plate and the top plate, the adjusting screw is connected to the nut seat fixed on the lower mounting base plate, and an air blowing pipe is provided on the top plate.

[0032] Furthermore, the most critical part of the device of the present invention is the design of the cam, because when designing the cam, it is necessary to consider the matching with the bag feeding machine, the upper suction cup, the lower suction cup, and the top blowing mechanism. The cam design diagram is shown in FIG. Figure 6 As shown, the cam design has a total of 6 strokes, the first stroke occupies 100 degrees, at this time the suction cup group remains open and stationary, and the bag feeding machine sends the bag between the suction cup groups; the second stroke occupies 70 degrees, at this time the suction cup group moves from the farthest state to the closest state, and the inner and outer suction cups are combined; the third stroke occupies 35 degrees, at this time the suction cup group remains stationary, and the suction cup group is opened to vacuum; the fourth stroke occupies 50 degrees, and a small hole is opened at the top of the bag; the fifth stroke occupies 25 degrees, at this time the suction cup group remains in a stationary state with a small hole opened at the top of the bag, and air is blown from the top of the blowing pipe to let air enter the bag; the sixth stroke occupies 80 degrees, the suction cup group continues to move the second stroke, and the bag opens wider.

[0033] Furthermore, a fixing seat 13 is installed on the top plate, and the fixing seat is connected to the blowing pipe through a fixing rod 12. The blowing pipe is a hollow pipe and is connected to an external air source. The valve control of the blowing pipe is determined by the stroke design of the cam mechanism and is indirectly controlled by the bag feeding machine. The air source uses equipment such as an air compressor. The fixing rod and the blowing pipe are connected by a cross clamp 14. The cross clamp connects the fixing rod and the blowing pipe, and the front and rear positions and the upper and lower installation positions of the blowing pipe can be adjusted.

[0034] Furthermore, an upper slide rail 26 is provided on the upper mounting base plate, and the upper slide rail connects the first rod and the second rod through a slider, and the ends of the first rod and the second rod are connected to the upper fixing frame 22, and the upper fixing frame is connected to the upper suction cup through the upper connector 23, and a vacuum is passed through the upper suction cup, and the upper suction cup is connected to the vacuum pump through a pipeline, and the vacuum valve control is determined by the stroke design of the cam mechanism and is indirectly controlled by the bag feeding machine, and the upper driving rod has a key groove on it, which can swing back and forth, and drives the first rod and the second rod to move back and forth through the upper connecting rod.

[0035] Furthermore, the lower mounting base plate is provided with a lower rail 36, which is connected to the third rod and the fourth rod through a slider, and the ends of the third rod and the fourth rod are connected to the lower fixing frame 32, which is connected to the lower suction cup through a lower connector 33, and a spring is provided between the lower suction cup and the lower connector, and a vacuum is passed through the lower suction cup, which is connected to the vacuum pump through a pipeline, and the control of the vacuum valve is determined by the stroke design of the cam mechanism and is indirectly controlled by the bag feeding machine, and the lower driving rod has a keyway on it, which can swing back and forth, and drives the third rod and the fourth rod to move forward and backward through the lower connecting rod. The lower mounting base plate is also provided with a bag feeding guide rod 30, and the lower connector is provided with a long hole, and the pipe part of the lower suction cup is locked with the long hole through a double nut, and the spring is installed between the suction nozzle outside the pipe of the lower suction cup and the double nut, and when the inner and outer suction cups of the lower suction cup collide, the spring will be compressed.

[0036] Furthermore, the driving part of the entire driving mechanism, the cam is worn on the main shaft of the bag feeder (the main shaft of the bag feeder is not shown in the figure), and rotates counterclockwise. The cam rotates one circle (360 degrees) to complete an action cycle. The specific stroke design is shown in Figure 6 . The bag opening connecting rod is provided with a joint bearing, and a pin is provided at the end of the rod on the joint bearing. The pin is slidably set in the long hole of the bottom driving connecting rod. The driving shaft is connected to the bottom driving connecting rod through the bearing. The design of the long hole can adjust the stroke of the suction cup to adapt to bags of different sizes. A support column 45 is also provided between the bottom plate and the top plate. The support column runs through the upper mounting base plate and the lower mounting base plate. The adjusting screw is also connected to the hand wheel 47. The adjusting screw can be manually rotated to drive the nut seat of the lower suction cup mechanism, so that the height of the entire lower suction cup mechanism can be adjusted up and down. The driving shaft is driven by the bottom cam and the connecting rod to rotate and swing back and forth. There is a keyway on it, so as to drive the upper driving rod and the lower driving rod to swing back and forth. A spring for resetting is also provided between the bag opening connecting rod and the bag feeding machine.

[0037] An operating method of a bag feeding machine's upper and lower linkage bag opening device comprises the following steps:

[0038] S1. Bag feeding process, the bag feeding machine transports the bags between the suction cup groups;

[0039] S2. The top of the bag is opened, and the cam drives the upper suction cup to open the vacuum to suck the bag, while the lower suction cup does not open the vacuum;

[0040] S3. Blowing process on the top of the bag, the blowing pipe blows air to the top of the bag, and the lower suction cup turns on the vacuum; S4. Bag moving process, the blowing pipe stops blowing, the cam stroke is reset, and the bag feeding machine moves the bag out.

[0041] In the S2 process, when the cam completes the first stroke and the upper suction cup just sticks to the bag, the lower suction cup will collide with the bag and shrink elastically; in the S3 process, the cam continues to have the second stroke, at which time both the upper and lower suction cups suck the bag, and the top and bottom of the bag will be torn apart, thus completing the bag opening action; in the S4 process, the blowing tube is closed after the cam completes the second stroke.

[0042] Specifically, the actions of each process in this device are described as follows:

[0043] 1. The turntable of the bag feeding machine (not shown in the attached figure) delivers the bag to the bag opening station, at which time the inner and outer suction cups are at the farthest position;

[0044] 2. The cam drives each connecting rod device to move the inner and outer suction cups to the closest position. At the same time, the upper suction cup opens the vacuum to suck the bag, and the lower suction cup does not open the vacuum. At this time, the two upper suction cups just stick to the bag, and the lower suction cup will collide. However, because there is a spring on the lower suction cup, the spring will be compressed, so we see that the lower suction cup also just sticks to the bag;

[0045] 3. After the cam has completed the first stroke, the upper suction cup has moved a short distance, and a small opening is formed on the bag. However, the spring of the lower suction cup is in a compressed state, and this stroke only offsets the compression of the spring, leaving the spring in a natural state. As a result, the lower suction cup still sticks to the bag, which means that the bag is not opened at the bottom.

[0046] 4. After completing step 3 above, there will be a short pause. At this time, the suction cup keeps the top of the bag open with a small opening, and the top is blown open to allow more air to enter the bag. At the same time, the bottom suction cup opens the vacuum to suck the bottom of the bag;

[0047] 5. The cam then goes to the second stroke. At this time, the upper and lower suction cups of the bag both suck the bag. When the suction cups move to the farthest position, the top and bottom of the bag will be torn apart, thus completing the bag opening action. Note that during the second stroke, the top blower is always open and is closed only after the second stroke is completed, so as to ensure that more gas enters the bag faster when opening the bag;

[0048] 6. After step 5 is completed, the turntable of the bag making machine sends the bag away and sends a new bag at the same time, completing an action cycle, and then repeat step 1 to enter the next cycle.

[0049] The innovative features of the device of the present invention are:

[0050] 1. The bottom driving connecting rod has a long hole, which can adapt to different bag widths. After adjustment, the first and second strokes of the cam will be scaled in the same proportion. Because of the existence of the adjustment screw, when the bag length is different, by turning the hand wheel, the overall position of the lower suction cup mechanism can be changed up and down at will, and the adjustment is very convenient;

[0051] 2. Without the traditional cylinder structure, there will be no unstable factors of the cylinder. The opening and closing of the upper and lower suction cups use the same cam, the action is completely matched, the action is reliable, the coordination is compact, and the bag opening is stable;

[0052] 3. With the application of slide rails and connecting rods, the suction cup follows a straight line from front to back, without any left or right or up and down shaking, and the execution is stable;

[0053] Fourth, the application of the spring on the lower suction cup cleverly offsets the first stroke of the cam, thereby preventing the bottom suction cup from detaching from the bag during the first stroke.

[0054] In the device of the present invention, the auxiliary equipment on the bag feeding machine, such as the air source, the vacuum pump and its control valve and the corresponding control program, are existing technologies or materials, and the relevant technical personnel can directly purchase or customize them from the market according to the required product models and specifications.

[0055] The electrical components mentioned in the text are all connected to an external main controller and industrial power supply, and the main controller can be a conventional known device such as a computer that plays a control role.

[0056] It should be noted that when an element is said to be "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is said to be "mounted on" another element, it may be directly mounted on the other element or there may be an intermediate element. When an element is said to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0057] The present invention is clearly and completely described through the technical solutions in the above embodiments. It is obvious that 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.

Claims

1. A bag opening device for a bag feeding machine, which is specially used for opening the bag mouth and bag bottom of a bag feeding packaging machine, characterized in that: It includes a top blowing mechanism, and the top blowing mechanism blows air toward the bag opening through a blowing pipe; An upper suction cup mechanism, wherein the upper suction cup mechanism comprises two groups of upper suction cups arranged opposite to each other, the two groups of upper suction cups are slidably arranged on the upper mounting base plate through the first rod and the second rod respectively, and the two ends of the upper driving rod on the upper mounting base plate are respectively hinged to the first rod and the second rod through the upper connecting rod; a lower suction cup mechanism, wherein the lower suction cup mechanism comprises two groups of lower suction cups arranged opposite to each other, the two groups of lower suction cups are telescopically fixed to the third rod and the fourth rod, the third rod and the fourth rod are both slidably arranged on the lower mounting base plate, the two ends of the lower driving rod on the lower mounting base plate are respectively hinged to the third rod and the fourth rod through the lower connecting rod, the ends of the third rod and the fourth rod are both connected to the lower fixing frame, the lower fixing frame is connected to the lower suction cup through the lower connecting head, and a spring is also provided between the lower suction cup and the lower connecting head; The driving mechanism includes a cam for driving the bag machine, the cam drives the bag opening connecting rod to move, the bag opening connecting rod is slidably connected to the bottom driving connecting rod, the bottom driving connecting rod is connected to the driving shaft, the driving shaft is connected to the upper driving rod and the lower driving rod, the driving shaft is installed between the bottom plate and the top plate, an adjusting screw rod is also provided between the bottom plate and the top plate, the adjusting screw rod is connected to a nut seat fixed on the lower mounting base plate, and an air blowing pipe is provided on the top plate; The cam design has a total of 6 strokes, the first stroke occupies 100 degrees, at this time the suction cup group remains open and stationary, and the bag feeding machine sends the bag between the suction cup groups; the second stroke occupies 70 degrees, at this time the suction cup group moves from the farthest state to the closest state, and the inner and outer suction cups are combined; the third stroke occupies 35 degrees, at this time the suction cup group remains stationary, and the suction cup group is opened to vacuum; the fourth stroke occupies 50 degrees, and a small hole is opened at the top of the bag; the fifth stroke occupies 25 degrees, at this time the suction cup group remains in a stationary state with a small hole opened at the top of the bag, and air is blown from the top of the blowing pipe to let air enter the bag; the sixth stroke occupies 80 degrees, the suction cup group continues to move the second stroke, and the bag opens wider.

2. The upper and lower linkage bag opening device of the bag feeding machine according to claim 1 is characterized in that: A fixing seat is installed on the top plate, the fixing seat is connected with the air blowing pipe via a fixing rod, and the fixing rod and the air blowing pipe are connected via a cross clamp.

3. The upper and lower linkage bag opening device of the bag feeding machine according to claim 1 is characterized in that: The upper mounting base plate is provided with an upper slide rail, which connects the first rod and the second rod through a slider, the ends of the first rod and the second rod are connected to an upper fixing frame, and the upper fixing frame is connected to the upper suction cup through an upper connecting head; the lower mounting base plate is provided with a lower slide rail, which connects the third rod and the fourth rod through a slider.

4. The upper and lower linkage bag opening device of the bag feeding machine according to claim 3 is characterized in that: The lower mounting base plate is also provided with a bag feeding guide rod, the lower connecting head is provided with a long hole, the tube of the lower suction cup is locked with the long hole through a double nut, and the spring is installed between the suction nozzle outside the tube of the lower suction cup and the double nut.

5. The upper and lower linkage bag opening device of the bag feeding machine according to claim 1 is characterized in that: The bag opening connecting rod is provided with a joint bearing, the end of the rod on the joint bearing is provided with a pin, the pin is slidably arranged in the long strip hole of the bottom driving connecting rod, and the driving shaft is connected to the bottom driving connecting rod through the bearing.

6. The upper and lower linkage bag opening device of the bag feeding machine according to claim 5, characterized in that: A support column is also arranged between the bottom plate and the top plate, the support column passes through the upper mounting base plate and the lower mounting base plate, and the adjusting screw rod is also connected to the hand wheel.

7. The method for operating the upper and lower linkage bag opening device of the bag feeding machine according to any one of claims 1 to 6, characterized in that: The steps include: S1. Bag feeding process, the bag feeding machine transports the bags between the suction cup groups; S2. The top of the bag is opened, and the cam drives the upper suction cup to open the vacuum to suck the bag, while the lower suction cup does not open the vacuum; S3. Blowing process at the top of the bag, the blowing pipe blows air to the top of the bag, and the lower suction cup opens the vacuum; S4. Bag moving process, the air blowing pipe stops blowing, the cam stroke is reset, and the bag feeding machine moves the bag out.

8. The method for operating the upper and lower linkage bag opening device of the bag feeding machine according to claim 7, characterized in that: In the S2 process, when the cam completes the first stroke and the upper suction cup just sticks to the bag, the lower suction cup will collide with the bag and shrink elastically; in the S3 process, the cam continues to have the second stroke, at which time both the upper and lower suction cups suck the bag, and the top and bottom of the bag will be torn apart, thus completing the bag opening action; in the S4 process, the blowing tube is closed after the cam completes the second stroke.

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