A bag mouth clamping mechanism for a vacuum packaging machine and a vacuum packaging machine

Abstract

The present invention discloses a bag mouth clamping mechanism for a vacuum packaging machine and a vacuum packaging machine using the clamping mechanism. The clamping mechanism includes a fixing plate, a rotating shaft, two clamping arms and a clamping block. The rotating shaft is pivotally connected to the fixing plate. One end of each clamping arm is fixedly connected to the rotating shaft. Two ends of the clamping block are respectively connected to the other ends of the two clamping arms. The rotating shaft can be driven by a first driving mechanism to rotate back and forth. A clamping seat is arranged on the fixing plate at a position corresponding to the clamping block. When the rotating shaft rotates to drive the clamping block to lean against the clamping seat, the bag mouth of the packaging bag is clamped and a gap is left at the bag mouth. An auxiliary clamping block is installed on the clamping block. The clamping mechanism further includes an auxiliary clamping block pressing and holding mechanism. After the bag mouth of the packaging bag is clamped by the clamping block and the clamping seat and vacuum pumping is completed, the auxiliary clamping block is driven by a second driving mechanism to cooperate with the clamping seat to clamp and seal the bag mouth of the packaging bag, and then the pressing and holding mechanism presses the auxiliary clamping block. The present invention can prevent air leakage at the bag mouth after the packaging bag is vacuum pumped, and improves the packaging qualification rate.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging machinery manufacturing, and in particular to a bag mouth clamping mechanism for a vacuum packaging machine and a vacuum packaging machine. Background Art

[0002] At present, the packaging of some granular materials such as rice and mung beans has generally adopted the method of using a packaging bag in combination with vacuum pumping for packaging. Using a packaging bag in combination with vacuum pumping for packaging granular materials such as rice and mung beans can not only extend the storage period of granular materials such as rice and mung beans, but also greatly facilitate logistics transportation. However, to adopt vacuum packaging, a vacuum packaging machine is required.

[0003] Existing vacuum packaging machines usually need to set up a clamping mechanism to clamp the bag mouth of the packaging bag with materials and then cooperate with the vacuum pumping mechanism to pump the air out of the packaging bag with materials. In order to pump out the air in the packaging bag, when the clamping mechanism clamps the bag mouth of the packaging bag, a certain gap needs to be left at the bag mouth. Then, after vacuum pumping, the vacuum degree in the packaging bag is used to make the gap at the bag mouth of the packaging bag automatically close. Finally, the bag mouth of the packaging bag is sealed by a sealing mechanism to form a vacuum packaging. However, in the actual packaging process, after vacuum pumping, affected by the gravity of the materials, the bag mouth of the packaging bag often wrinkles, and the gap at the bag mouth of the packaging bag cannot automatically close, resulting in air leakage, which affects the qualification rate of the packaging by the vacuum packaging machine. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a bag mouth clamping mechanism for a vacuum packaging machine, which can effectively prevent air leakage at the bag mouth after the packaging bag is vacuum pumped, and effectively improve the qualification rate of vacuum packaging.

[0005] To achieve the above object, the technical solution of the present invention is: A bag mouth clamping mechanism for a vacuum packaging machine, including a fixed plate, a rotating shaft, two clamping arms and a clamping block. The rotating shaft is pivotally connected to the fixed plate. One end of each clamping arm is fixedly connected to the rotating shaft. The two ends of the clamping block are respectively fixedly connected to the other ends of the two clamping arms. The rotating shaft can be driven by a first driving mechanism to rotate back and forth. A clamping seat is provided on the fixed plate corresponding to the position of the clamping block. When the rotating shaft rotates to drive the clamping block to lean against the clamping seat, the bag mouth of the packaging bag is clamped and a gap is left at the bag mouth. The gap communicates the inside and outside of the packaging bag.

[0006] An auxiliary clamping block is installed on the clamping block. The auxiliary clamping block is movably connected to the clamping block. A first compression spring is provided between the auxiliary clamping block and the clamping block. One end of the first compression spring abuts against the auxiliary clamping block and the other end abuts against the clamping block.

[0007] The clamping mechanism also includes an auxiliary clamping block pressing and holding mechanism. After the clamping block and the clamping seat clamp the bag opening of the packaging bag and complete the vacuuming, a second driving mechanism drives the auxiliary clamping block and the clamping seat to cooperate to clamp and seal the bag opening of the packaging bag. The pressing and holding mechanism presses the auxiliary clamping block to keep it clamped, and then the second driving mechanism disengages from the auxiliary clamping block; when the rotating shaft rotates in the opposite direction to drive the clamping block to disengage from the clamping seat, the pressing and holding mechanism also disengages from the auxiliary clamping block.

[0008] Preferably, the first driving mechanism includes a first cylinder and a driving crank arm, one end of the driving crank arm is fixedly connected to the rotating shaft, and the other end of the driving crank arm is provided with a long strip through hole, and a pin shaft is connected to the long strip through hole. The shell of the first cylinder is fixedly connected to the fixed plate, and the end of the piston rod of the first cylinder is pivotally connected to the pin shaft.

[0009] As a further improvement, the clamp block is pasted with a plurality of rubber pads at intervals on the side surface corresponding to the clamp seat, and the plurality of rubber pads arranged at intervals cooperate with the end surface of the clamp seat to clamp the bag opening of the packaging bag and leave a gap at the bag opening;

[0010] The auxiliary clamping block is pasted with a foam pad on one side corresponding to the clamping seat, and a silicone strip is installed at the position of the clamping seat corresponding to the foam pad. The foam pad and the silicone strip cooperate to clamp and seal the bag opening of the packaging bag.

[0011] In this way, on the one hand, the multiple rubber pads arranged at intervals cooperate with the end face of the clamp seat to reliably clamp the bag opening of the packaging bag and ensure that a gap is left at the bag opening of the packaging bag; on the other hand, the foam pad cooperates with the silicone strip to reliably clamp and seal the bag opening of the packaging bag.

[0012] As a further improvement, two mounting pins are installed on both sides of the clamp block, mounting through holes are provided on both sides of the auxiliary clamp block, the auxiliary clamp block is respectively sleeved on the two mounting pins through the two mounting through holes, and each mounting pin is sleeved with one of the first compression springs, so as to further optimize the connection structure between the clamp block and the auxiliary clamp block, so that the movement and reset of the auxiliary clamp block are more reliable.

[0013] Further improvement, the clamping block is provided with a clearance notch, and a driving block is fixedly provided on the auxiliary clamping block, the driving block protrudes from the clearance notch, the second driving mechanism is a second cylinder, the second driving mechanism is installed on the vacuum extraction mechanism of the vacuum packaging machine, and the piston rod of the second driving mechanism drives the driving block so that the auxiliary clamping block overcomes the elastic force of the first compression spring and cooperates with the clamping seat to clamp and seal the bag opening of the packaging bag.

[0014] Preferably, the pressing and holding mechanism includes two movable holding rods, each movable holding rod is installed on the outer side of a clamping arm, a mating convex column is provided on each side of the auxiliary clamping block, each mating convex column is matched with one end of a movable holding rod, a second compression spring is sleeved on each movable holding rod, and the second compression spring drives one end of each movable holding rod to lean against one of the mating convex columns; a toggling member is fixedly arranged on each movable holding rod, the side surface of each clamping arm is hinged to the middle of a toggle block, one end of the toggle block is matched with the toggling member, the other end of the toggle block is hinged to one end of a connecting rod, and the other end of the connecting rod is hinged to the fixed plate;

[0015] After the clamping block and the clamping seat clamp the bag mouth of the packaging bag to complete vacuum pumping, the second driving mechanism drives the auxiliary clamping block to cooperate with the clamping seat to clamp and seal the bag mouth of the packaging bag. The mating convex column follows the displacement of the auxiliary clamping block, and the movable holding rod moves forward under the drive of the second compression spring. One end of the movable holding rod presses against the mating convex column to maintain the clamping state of the auxiliary clamping block, and then the second driving mechanism disengages from the auxiliary clamping block; when the rotating shaft rotates in the reverse direction to drive the clamping block to separate from the clamping seat, the connecting rod pulls the other end of the toggle block to make the toggle block rotate, and the toggle block drives the toggling member to make the movable holding rod retreat and disengage from the mating convex column. This preferably designed pressing and holding mechanism does not require additional power, which is beneficial to controlling and optimizing the structural arrangement of the clamping mechanism.

[0016] Further preferably, the toggle block is generally V-shaped, the end face of one end of the movable holding rod is spherical, and the outer end face of the mating convex column is spherical.

[0017] Further improved, a front rod seat and a rear rod seat are fixedly arranged on the outer side surface of each clamping arm, through holes are provided on both the front rod seat and the rear rod seat, the movable holding rod is simultaneously arranged in the through holes of the front rod seat and the rear rod seat, and one end of the second compression spring abuts against the rear rod seat and the other end abuts against the toggling member.

[0018] Since the auxiliary clamping block is installed on the clamping block in this clamping mechanism, the auxiliary clamping block is movably connected to the clamping block, and a first compression spring is arranged between the auxiliary clamping block and the clamping block. One end of the first compression spring abuts against the auxiliary clamping block and the other end abuts against the clamping block; then an auxiliary clamping block pressing and holding mechanism is added. After the clamping block and the clamping seat clamp the bag mouth of the packaging bag to complete vacuum pumping, a second driving mechanism drives the auxiliary clamping block to cooperate with the clamping seat to clamp and seal the bag mouth of the packaging bag, and then the pressing and holding mechanism presses the auxiliary clamping block to maintain the clamping. In this way, even if there are wrinkles at the bag mouth of the packaging bag, by cooperating the auxiliary clamping block with the clamping seat to clamp and seal the bag mouth of the packaging bag, air leakage of the packaging bag can be avoided, and it can be reliably sent to the bag mouth sealing mechanism for sealing operation, greatly improving the qualification rate and packaging quality of vacuum packaging.

[0019] The present invention also provides a vacuum packaging machine, which includes a frame. A feeding mechanism, a plurality of bag clamping and shifting mechanisms, a vacuum pumping mechanism, and a bag mouth sealing mechanism for packaging bags are provided on the frame. A set of the above-mentioned clamping mechanisms is installed on each bag clamping and shifting mechanism. Each bag clamping and shifting mechanism is driven by a third driving mechanism to move intermittently in a cycle;

[0020] After the feeding mechanism fills the packaging bag with materials, the bag mouth of the packaging bag with materials is clamped by the clamping block and the clamping seat in a set of clamping mechanisms;

[0021] The vacuum pumping mechanism cooperates with a bag clamping and shifting mechanism to pump vacuum for the packaging bag with materials. After the vacuum pumping is completed, the second driving mechanism drives the auxiliary clamping block on the corresponding clamping mechanism to cooperate with the clamping seat to clamp and seal the bag mouth of the packaging bag. The matching convex column follows the displacement of the auxiliary clamping block, and the movable holding rod moves forward under the drive of the second compression spring. One end of the movable holding rod presses on the matching convex column to maintain the clamping state of the auxiliary clamping block;

[0022] The packaging bag with materials after the vacuum pumping is completed moves with the bag clamping and shifting mechanism to the bag mouth sealing mechanism for bag mouth sealing.

[0023] Further improvement, the vacuum packaging machine of the present invention further includes a conveying mechanism and a shaping mechanism. The shaping mechanism includes a secondary vacuum pumping mechanism and a mold. The conveying mechanism receives the packaging bag with materials after sealing and then sends it to the shaping mechanism for secondary vacuum pumping and shaping through the mold. The shaped packaging bag with materials is then sent out by the conveying mechanism. Through the conveying mechanism and the shaping mechanism, both the continuity of the operation is improved and the packaging quality is further improved.

[0024] The vacuum packaging machine of the present invention forms multi-station operations through the intermittent cyclic movement of the bag clamping and shifting mechanism, with high packaging efficiency. At the same time, due to the use of the above-mentioned clamping mechanism, air leakage of the packaging bag after vacuum pumping can be prevented, greatly improving the packaging qualification rate. Brief Description of the Drawings

[0025] Figure 1 is a three-dimensional view of the packaging bag clamped by the clamping mechanism of the present invention;

[0026] Figure 2 is Figure 1 an enlarged view of part A of

[0027] Figure 3 is a three-dimensional exploded view of the connecting components of the clamping block and the auxiliary clamping block in the clamping mechanism of the present invention;

[0028] Figure 4 is a three-dimensional view of the open state of the clamping mechanism of the present invention;

[0029] Figure 5 is a right view of the open state of the clamping mechanism of the present invention;

[0030] Figure 6 It is another perspective three-dimensional view of the open state of the clamping mechanism of the present invention;

[0031] Figure 7 It is a three-dimensional schematic diagram of the clamping mechanism of the present invention provided on a vacuum packaging machine;

[0032] Figure 8 It is a three-dimensional view of a vacuum packaging machine;

[0033] Figure 9 It is a three-dimensional view of a vacuum packaging machine with part of the housing hidden. Detailed implementation manner

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0035] Figures 1 to 7 As shown, a bag mouth clamping mechanism for a vacuum packaging machine includes a fixing plate 1, a rotating shaft 2, two clamping arms 3 and a clamping block 4. The rotating shaft 2 is pivotally connected to the fixing plate 1 through two shaft seats 21. One end of each clamping arm 3 is fixedly connected to the rotating shaft 2, and both ends of the clamping block 4 are tightly connected to the other ends of the two clamping arms 3 respectively. The rotating shaft 2 is driven by a first driving mechanism 5 to rotate back and forth; a clamping seat 11 is provided on the fixing plate 1 at a position corresponding to the clamping block 4. When the rotating shaft 2 rotates to drive the clamping block 4 to lean against the clamping seat 11, the bag mouth of the packaging bag 10 is clamped and a gap is left at the bag mouth, and the gap communicates the inside and outside of the packaging bag 10;

[0036] An auxiliary clamping block 6 is installed on the clamping block 4. The auxiliary clamping block 6 is movably connected to the clamping block 4. A first compression spring 41 is provided between the auxiliary clamping block 6 and the clamping block 4. One end of the first compression spring 41 abuts against the auxiliary clamping block 6 and the other end abuts against the clamping block 4;

[0037] This clamping mechanism further includes a pressing and holding mechanism 7 for the auxiliary clamping block 6. After the bag mouth of the packaging bag 10 is clamped by the clamping block 4 and the clamping seat 11 and vacuum pumping is completed, the auxiliary clamping block 6 is driven by a second driving mechanism 8 to cooperate with the clamping seat 11 to clamp and seal the bag mouth of the packaging bag 10. The pressing and holding mechanism 7 presses the auxiliary clamping block 6 to maintain the clamping state, and then the second driving mechanism 8 disengages from the auxiliary clamping block 6. When the rotating shaft 2 rotates in the reverse direction to drive the clamping block 4 to disengage from the clamping seat 11, the pressing and holding mechanism 7 also disengages from the auxiliary clamping block 6.

[0038] The pressing and holding mechanism 7 includes two movable holding rods 71. Each movable holding rod 71 is mounted on the outer side of a clamping arm 3. A mating convex post 61 is provided on each side of the auxiliary clamping block 6. Each mating convex post 61 cooperates with one end of a movable holding rod 71. A second compression spring 72 is sleeved on each movable holding rod 71. The second compression spring 72 urges one end of each movable holding rod 71 to lean against one of the mating convex posts 61. A toggling member 73 is fixedly provided on each movable holding rod 71. The side surface of each clamping arm 3 is hinged to the middle of a dial block 74. One end of the dial block 74 cooperates with the toggling member 73, and the other end of the dial block 74 is hinged to one end of a connecting rod 75. The other end of the connecting rod 75 is hinged to the fixed plate 1;

[0039] After the clamping block 4 and the clamping seat 11 clamp the bag mouth of the packaging bag 10 and complete vacuum pumping, the auxiliary clamping block 6 is driven by a second driving mechanism 8 to cooperate with the clamping seat 11 to clamp and seal the bag mouth of the packaging bag 10. The mating convex post 61 follows the displacement of the auxiliary clamping block 6. The movable holding rod 71 moves forward under the drive of the second compression spring 72, and one end of the movable holding rod 71 presses on the mating convex post 61 to maintain the clamping state of the auxiliary clamping block 6. Then, the second driving mechanism 8 disengages from the auxiliary clamping block 6.

[0040] When the rotating shaft 2 rotates reversely to drive the clamping block 4 to disengage from the clamping seat 11, the connecting rod 75 pulls the other end of the dial block 74 to make the dial block 74 rotate. The dial block 74 drives the toggling member 73 to make the movable holding rod 71 retract and disengage from the mating convex post 61. When the clamping block 4 is in the open state and disengaged from the clamping seat 11, since the side surface of the mating convex post 61 will act on the movable holding rod 71, the movable holding rod 71 cannot press on the mating convex post 61.

[0041] Preferably, the dial block 74 is generally V-shaped, the end face of one end of the movable holding rod 71 is spherical, and the outer end face of the mating convex post 61 is spherical.

[0042] A front rod seat 31 and a rear rod seat 32 are fixedly provided on the outer side surface of each clamping arm 3. Through holes are provided on both the front rod seat 31 and the rear rod seat 32. The movable holding rod 71 passes through the through holes of the front rod seat 31 and the rear rod seat 32 at the same time. One end of the second compression spring 72 abuts against the rear rod seat 32, and the other end abuts against the toggling member 73.

[0043] A plurality of rubber pads 42 are adhesively attached at intervals on the side surface of the clamping block 4 corresponding to the clamping seat 11. The plurality of rubber pads 42 arranged at intervals cooperate with the end face of the clamping seat 11 to clamp the bag mouth of the packaging bag 10 and leave a gap at the bag mouth. The gap communicates the inside and the outside of the packaging bag 10;

[0044] A foaming pad 62 is adhesively attached to one side of the auxiliary clamping block 6 corresponding to the clamping seat 11. A silica gel strip 12 is installed on the clamping seat 11. The foaming pad 62 cooperates with the silica gel strip 12 to clamp and seal the bag mouth of the packaging bag 10.

[0045] The clamping seat 11 is also provided with a plurality of long concave-convex structures 13 to facilitate hot-melt sealing in cooperation with the sealing mechanism.

[0046] The first driving mechanism 5 includes a first cylinder 51 and a driving crank arm 52, one end of the driving crank arm 52 is fixedly connected to the rotating shaft 2, and the other end of the driving crank arm 52 is provided with two long strip through holes 521, and a pin shaft 53 is connected to the two long strip through holes 521. The shell of the first cylinder 51 is fixedly connected to the fixed plate 1, and the end of the piston rod of the first cylinder 51 is pivotally connected to the pin shaft 53.

[0047] The fixing plate 1 is fixedly connected to a supporting plate 9 via a plurality of pad columns 14 .

[0048] Two mounting pins 43 are installed on both sides of the clamping block 4, and mounting through holes are provided on both sides of the auxiliary clamping block 6. The auxiliary clamping block 6 is respectively sleeved on the two mounting pins 43 through the two mounting through holes, and each mounting pin 43 is sleeved with one of the first compression springs 41.

[0049] The clamp block 4 is provided with a clearance notch 44, and the auxiliary clamp block 6 is provided with a driving block 63, which protrudes from the clearance notch 44. The second driving mechanism 8 is a second cylinder. Figure 7 As further shown, the second driving mechanism 8 is installed on the vacuum extraction mechanism 400 of the vacuum packaging machine. The piston rod of the second driving mechanism 8 drives the driving block 63 so that the auxiliary clamping block 6 overcomes the elastic force of the first compression spring 41 and cooperates with the clamping seat 11 to clamp the bag opening of the sealed packaging bag 10.

[0050] from Figure 3 It can be further seen that the auxiliary clamping block 6 is formed by connecting a pressing plate 6a, a pressing block 6b, a driving block 63, a foam pad 62 and two matching protrusions 61.

[0051] Figures 7 to 9 As shown, a vacuum packaging machine includes a frame 100, on which a filling mechanism 200, a plurality of bag clamping and shifting mechanisms 300, a vacuuming mechanism 400 and a bag mouth sealing mechanism 500 of a packaging bag 10 are arranged, each bag clamping and shifting mechanism 300 is equipped with a set of the above-mentioned clamping mechanism 600 on the moving mechanism, the fixed plate 1 on the clamping mechanism 600 is fixedly connected to a supporting plate 9 of the bag clamping and shifting mechanism 300 through a plurality of pads 14, each bag clamping and shifting mechanism 300 is driven to intermittently cyclically move by a third driving mechanism 700, and the third driving mechanism 700 is a rotating mechanism; the second driving mechanism 8 is installed on the vacuuming mechanism 400;

[0052] After the filling mechanism 200 fills the packaging bag 10 with materials, the packaging bag 10 with the materials is clamped by the clamping block 4 and the clamping seat 11 in a clamping mechanism 600;

[0053] The vacuum pumping mechanism 400 cooperates with a bag clamping and shifting mechanism 300 to pump the vacuum of the packaging bag 10 with materials. After the vacuum pumping is completed, the second driving mechanism 8 drives the auxiliary clamping block 6 on the corresponding clamping mechanism 600 to cooperate with the clamping seat 11 to clamp and seal the opening of the packaging bag 10. The matching convex column 61 follows the displacement of the auxiliary clamping block 6, and the movable holding rod 71 moves forward under the drive of the second compression spring 72. One end of the movable holding rod 71 presses the matching convex column 61 to maintain the clamping state of the auxiliary clamping block 6;

[0054] After the vacuum pumping is completed, the packaging bag 10 with materials moves with the bag clamping and shifting mechanism 300 to the bag mouth sealing mechanism 500 for bag mouth sealing. In this embodiment, the packaging bag 10 is a plastic bag, and the bag mouth is sealed by hot melt sealing.

[0055] This vacuum packaging machine further includes a conveying mechanism 800 and a shaping mechanism 900. The shaping mechanism 900 includes a secondary vacuum pumping mechanism and a mold. The conveying mechanism 800 receives the sealed packaging bag 10 and then sends it to the shaping mechanism 900 for secondary vacuum pumping and shaping through the mold. The shaped packaging bag 10 with materials is then sent out by the conveying mechanism 800.

[0056] The operation process of this vacuum packaging machine is as follows:

[0057] A bag clamping and shifting mechanism 300 is driven by a third driving mechanism 700 to move clockwise intermittently in a cyclic manner to the filling and clamping station. After the filling mechanism 200 fills the packaging bag 10 with materials, the opening of the packaging bag 10 with materials is clamped by the clamping block 4 and the clamping seat 11 in the clamping mechanism 600 of the bag clamping and shifting mechanism 300;

[0058] Then, this bag clamping and shifting mechanism 300 and the packaging bag 10 with materials rotate together to the vacuum pumping station. The vacuum pumping mechanism 400 moves to cooperate with this bag clamping and shifting mechanism 300 to pump the vacuum of the packaging bag 10 with materials. After the vacuum pumping is completed, the second driving mechanism 8 drives the auxiliary clamping block 6 on the corresponding clamping mechanism 600 to cooperate with the clamping seat 11 to clamp and seal the opening of the packaging bag 10. The matching convex column 61 follows the displacement of the auxiliary clamping block 6, and the movable holding rod 71 moves forward under the drive of the second compression spring 72. One end of the movable holding rod 71 presses the matching convex column 61 to maintain the clamping state of the auxiliary clamping block 6. Then, the second driving mechanism 8 disengages from the auxiliary clamping block 6, and the vacuum pumping mechanism 400 moves back to its original position;

[0059] Subsequently, the bag clamping and shifting mechanism 300 rotates together with the packaging bag 10 carrying the material to the sealing station, and the bag mouth sealing mechanism 500 performs hot melt sealing on the bag mouth of the packaging bag 10. After sealing, the first driving mechanism 5 on the clamping mechanism 600 operates, and the rotating shaft 2 rotates in the reverse direction to drive the clamping block 4 to disengage from the clamping seat 11. At the same time, the pressing and holding mechanism 7 also disengages from the auxiliary clamping block 6, and the packaging bag 10 carrying the material falls onto the conveying mechanism 800. The conveying mechanism 800 receives the sealed packaging bag 10 and then sends it to the shaping mechanism 900 for secondary vacuum pumping and shaping through a mold. The shaped packaging bag 10 with the material is then sent out by the conveying mechanism 800;

[0060] Subsequently, the bag clamping and shifting mechanism 300 is driven by the third driving mechanism 700 to move intermittently in a clockwise cycle to the preparation station for the next cycle operation.

[0061] The vacuum packaging machine of this embodiment adopts vertical bag clamping, vertical vacuum pumping, and vertical sealing, greatly improving its packaging efficiency.

[0062] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all such changes are within the protection scope of the present invention.

Claims

1. A bag mouth clamping mechanism for a vacuum packaging machine, characterized in that: It comprises a fixed plate, a rotating shaft, two clamping arms and a clamping block, the rotating shaft is pivotally connected to the fixed plate, one end of each clamping arm is fixedly connected to the rotating shaft, two ends of the clamping block are respectively fixedly connected to the other ends of the two clamping arms, and the rotating shaft is driven by a first driving mechanism to rotate back and forth; a clamping seat is provided at a position of the fixed plate corresponding to the clamping block, and when the rotating shaft rotates and drives the clamping block to approach the clamping seat, the bag opening of the packaging bag is clamped and a gap is left at the bag opening, and the gap connects the inside and the outside of the packaging bag; The clamp block is provided with an auxiliary clamp block, which is movably connected to the clamp block, and a first compression spring is provided between the auxiliary clamp block and the clamp block, one end of the first compression spring abuts against the auxiliary clamp block, and the other end abuts against the clamp block; The clamping mechanism also includes an auxiliary clamping block pressing and holding mechanism. After the clamping block and the clamping seat clamp the bag opening of the packaging bag and complete the vacuuming, a second driving mechanism drives the auxiliary clamping block and the clamping seat to cooperate to clamp and seal the bag opening of the packaging bag. The pressing and holding mechanism presses the auxiliary clamping block to keep it clamped, and then the second driving mechanism disengages from the auxiliary clamping block; when the rotating shaft rotates in the opposite direction to drive the clamping block to disengage from the clamping seat, the pressing and holding mechanism also disengages from the auxiliary clamping block.

2. The bag mouth clamping mechanism for a vacuum packaging machine according to claim 1, wherein: The first driving mechanism includes a first cylinder and a driving crank arm, one end of the driving crank arm is fixedly connected to the rotating shaft, and the other end of the driving crank arm is provided with a long strip through hole, and a pin is connected to the long strip through hole. The shell of the first cylinder is fixedly connected to the fixed plate, and the end of the piston rod of the first cylinder is pivotally connected to the pin.

3. The bag mouth clamping mechanism for a vacuum packaging machine according to claim 1, characterized in that: The clamp block has a plurality of rubber pads attached to the side surface corresponding to the clamp seat at intervals, and the plurality of rubber pads arranged at intervals cooperate with the end surface of the clamp seat to clamp the bag opening of the packaging bag and leave a gap at the bag opening; The auxiliary clamping block is pasted with a foam pad on one side corresponding to the clamping seat, and a silicone strip is installed at the position of the clamping seat corresponding to the foam pad. The foam pad and the silicone strip cooperate to clamp and seal the bag opening of the packaging bag.

4. The bag mouth clamping mechanism for a vacuum packaging machine according to claim 1, characterized in that: Two mounting pins are arranged on both sides of the clamping block, mounting through holes are arranged on both sides of the auxiliary clamping block, the auxiliary clamping block is respectively sleeved on the two mounting pins through the two mounting through holes, and each mounting pin is sleeved with one of the first compression springs.

5. The bag mouth clamping mechanism for a vacuum packaging machine according to claim 1, characterized in that: The clamp block is provided with a clearance notch, and a driving block is fixedly provided on the auxiliary clamp block, the driving block protrudes from the clearance notch, the second driving mechanism is a second cylinder, and the second driving mechanism is installed on the vacuum extraction mechanism of the vacuum packaging machine, and the piston rod of the second driving mechanism drives the driving block so that the auxiliary clamp block overcomes the elastic force of the first compression spring and cooperates with the clamp seat to clamp and seal the bag opening of the packaging bag.

6. A bag mouth clamping mechanism for a vacuum packaging machine according to any one of claims 1 to 5, characterized in that: The clamping and holding mechanism comprises two movable holding rods, each movable holding rod is mounted on the outer side of a clamping arm, a matching convex column is respectively provided on both sides of the auxiliary clamping block, each matching convex column matches with one end of a movable holding rod, and a second compression spring is sleeved on each movable holding rod, and the second compression spring drives one end of each movable holding rod to lean against one of the matching convex columns; a toggle piece is fixedly arranged on each movable holding rod, and the side surface of each clamping arm is hinged to the middle part of a toggle block, one end of the toggle block matches with the toggle piece, and the other end of the toggle block is hinged to one end of a connecting rod, and the other end of the connecting rod is hinged to the fixed plate; After the clamping block and the clamping seat clamp the bag opening of the packaging bag and complete vacuuming, the second driving mechanism drives the auxiliary clamping block to cooperate with the clamping seat to clamp and seal the bag opening of the packaging bag, the matching protrusion follows the displacement of the auxiliary clamping block, and the movable retaining rod moves forward under the drive of the second compression spring, and one end of the movable retaining rod presses the matching protrusion to maintain the clamping state of the auxiliary clamping block, and then the second driving mechanism disengages from the auxiliary clamping block; the rotating shaft rotates in the opposite direction to drive the clamping block to disengage from the clamping seat, while the connecting rod pulls the other end of the shifting block to make the shifting block rotate, and the shifting block drives the shifting member to make the movable retaining rod retreat and disengage from the matching protrusion.

7. The bag mouth clamping mechanism for a vacuum packaging machine according to claim 6, characterized in that: The shift block is generally V-shaped, the end surface of one end of the movable retaining rod is spherical, and the outer end surface of the matching protrusion is spherical.

8. The bag mouth clamping mechanism for a vacuum packaging machine according to claim 6, characterized in that: A front rod seat and a rear rod seat are fixedly provided on the outer side of each clamp arm, and through holes are provided on the front rod seat and the rear rod seat. The movable retaining rod is simultaneously passed through the through holes of the front rod seat and the rear rod seat, and one end of the second compression spring abuts against the rear rod seat and the other end abuts against the toggle member.

9. A vacuum packaging machine, comprising a frame, characterized in that: The frame is provided with a filling mechanism, a plurality of bag clamping and shifting mechanisms, a vacuuming mechanism and a bag mouth sealing mechanism for the packaging bag, each bag clamping and shifting mechanism is provided with a set of clamping mechanisms as claimed in any one of claims 6 to 8, and each bag clamping and shifting mechanism is driven to move intermittently and cyclically by a third driving mechanism; After the filling mechanism fills the packaging bag with materials, the bag opening of the packaging bag with materials is clamped by a clamping block and a clamping seat in a clamping mechanism; The vacuuming mechanism cooperates with a bag clamping and shifting mechanism to vacuum the packaging bag with the material. After the vacuuming is completed, the second driving mechanism drives the auxiliary clamping block on the corresponding clamping mechanism to cooperate with the clamping seat to clamp and seal the bag opening of the packaging bag. The matching protrusion follows the displacement of the auxiliary clamping block. The movable retaining rod is driven forward by the second compression spring, and one end of the movable retaining rod presses the matching protrusion to maintain the clamping state of the auxiliary clamping block. After the vacuuming is completed, the packaging bag carrying the material follows the bag clamping and shifting mechanism to move to the bag opening sealing mechanism for bag opening sealing.

10. A vacuum packaging machine according to claim 9, characterized in that: It also includes a conveying mechanism and a shaping mechanism. The shaping mechanism includes a secondary vacuuming mechanism and a mold. The conveying mechanism receives the packaging bag with materials after sealing and then sends it to the shaping mechanism for secondary vacuuming and shaping through the mold. The shaped packaging bag with materials is then sent out by the conveying mechanism.

Images