Inserting corner positioning and sealing device for packaging bag

Abstract

A corner inserting positioning and sealing device for a packaging bag comprises an upper sealing die, a lower sealing die, an upper negative pressure box, a lower negative pressure box, a left upper opening device, a right upper opening device, a left lower opening device, a right lower opening device, a left corner inserting mechanism, a right corner inserting mechanism and a corner inserting driving mechanism. The device is characterized by further comprising an upper mounting frame, an upper lifting mechanism, an upper lifting seat, a lower mounting frame, a lower lifting mechanism, a lower lifting seat and a stop structure, the stop structure is arranged between the upper negative pressure box and the lower negative pressure box or between the bottom of the upper mounting frame and the top of the lower mounting frame; under the condition that the upper elastic telescopic device is arranged, the upper elastic telescopic device enables the upper mounting frame to have the trend of descending relative to the upper sealing mold; under the condition that the lower elastic telescopic device is arranged, the lower elastic telescopic device enables the lower installation frame to have the trend of rising relative to the lower sealing die. According to the corner inserting positioning sealing device, the situation that the corresponding bag opening expanding pieces on the upper side and the lower side collide can be effectively avoided, and normal operation of the corner inserting positioning sealing device is ensured.

Description

Technical Field

[0001] The utility model relates to a packaging machine, in particular to a corner inserting, positioning and sealing device for a packaging bag. Background Art

[0002] The Chinese utility model patent specification with publication number CN207644761U discloses a packaging corner positioning device, comprising an upper fixing plate and a lower fixing plate, wherein the upper fixing plate is provided with an upper heating device, and the lower fixing plate is provided with a lower heating device, an upper negative pressure box is provided on the surface formed by the upper fixing plate and the upper heating device, and a lower negative pressure box is provided on the surface formed by the lower fixing plate and the lower heating device, wherein negative pressure holes (air suction holes) are provided on the upper negative pressure box and the lower negative pressure box, an upper left positioning rod and an upper right positioning rod are provided at both ends of the upper negative pressure box, and a lower left positioning rod is provided at both ends of the lower negative pressure box. The positioning rod and the lower right positioning rod, the upper left positioning rod, the upper right positioning rod, the lower left positioning rod and the lower right positioning rod are used to clamp the four rectangular corners of the opening of the product to be sealed; the right flat insert plate and the left flat insert plate are respectively installed at both ends of the frame between the upper fixed plate and the lower fixed plate, and the right flat insert plate and the left flat insert plate move relative to each other along the axial direction so that the two opposite side surfaces of the sealed product abut against each other; it also includes a driving mechanism, the driving mechanism controls the upper left positioning rod, the upper right positioning rod, the lower left positioning rod and the lower right positioning rod to position the product to be sealed; the driving mechanism controls the right flat insert plate and the left flat insert plate to clamp the product to be sealed. When this packaging corner insertion and positioning device is working, the product to be sealed is placed between the upper fixed plate and the lower fixed plate, and the upper negative pressure box and the lower negative pressure box suck the mouth of the product to be sealed, so that the mouth of the product to be sealed is rectangular; the upper left positioning rod, the upper right positioning rod, the lower left positioning rod and the lower right positioning rod enter the inner side of the opening of the product to be sealed through the driving mechanism, and tighten the mouth of the product to be sealed and position it; the upper fixed plate and the lower fixed plate are combined by the driving mechanism, and at the same time, the right flat inserting plate and the left flat inserting plate are combined by the driving mechanism, thereby realizing the corner insertion and sealing of the packaging bag.

[0003] However, when the four positioning rods (bag opening stretchers) tighten and position the bag opening of the product to be sealed, the upper left positioning rod and the lower left positioning rod are aligned with each other, and the upper right positioning rod and the lower right positioning rod are aligned with each other. Therefore, when the upper fixed plate and the lower fixed plate are merged through the driving mechanism, it is easy for inertia to cause the lower end of the upper left positioning rod to collide with the upper end of the lower left positioning rod, and the lower end of the upper right positioning rod to collide with the upper end of the lower right positioning rod, resulting in damage to the positioning rods and their driving mechanisms. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a corner positioning sealing device for packaging bags, which can effectively prevent the corresponding bag opening expansion members on the upper and lower sides from colliding during sealing. The technical solution adopted is as follows:

[0005] A corner inserting positioning sealing device for a packaging bag comprises an upper sealing die, a lower sealing die, an upper negative pressure box, a lower negative pressure box, an upper left opening device, an upper right opening device, a lower left opening device, a lower right opening device, a left corner inserting mechanism, a right corner inserting mechanism and a corner inserting driving mechanism; the upper sealing die is located above the lower sealing die; an upper air suction hole is provided on the lower surface of the upper negative pressure box, and a lower air suction hole is provided on the upper surface of the lower negative pressure box; the upper left opening device, the upper right opening device, the lower left opening device and the lower right opening device all comprise an opening member and an opening member position switching device, and the opening member is connected to the power output end of the opening member position switching device; the left corner inserting mechanism and the right corner inserting mechanism are located on the left and right sides of the upper sealing die and the lower sealing die respectively, and the left corner inserting mechanism and the right corner inserting mechanism are both installed on the power output end of the corner inserting driving mechanism, characterized in that:

[0006] The insert angle positioning and sealing device also includes an upper mounting frame, an upper lifting mechanism, an upper lifting seat, a lower mounting frame, a lower lifting mechanism, a lower lifting seat and a stop structure; the upper mounting frame is mounted on the upper sealing mold, the upper lifting mechanism is mounted on the upper mounting frame, the upper lifting seat is connected to the power output end of the upper lifting mechanism, the upper left opening device and the upper right opening device are mounted on the upper lifting seat, and the upper negative pressure box is mounted on the bottom of the upper mounting frame; the lower mounting frame is mounted on the lower sealing mold, the lower lifting mechanism is mounted on the lower mounting frame, the lower lifting seat is connected to the power output end of the lower lifting mechanism, the lower left opening device and the lower right opening device are mounted on the lower lifting seat, and the lower negative pressure box is mounted on the top of the lower mounting frame; the stop structure is arranged between the upper negative pressure box and the lower negative pressure box, or between the bottom of the upper mounting frame and the top of the lower mounting frame;

[0007] The angle positioning and sealing device further comprises an upper elastic telescopic device and / or a lower elastic telescopic device;

[0008] When an upper elastic telescopic device is provided, the upper mounting frame can be raised and lowered relative to the upper sealing mold. The upper elastic telescopic device is provided between the upper mounting frame and the upper sealing mold. The upper elastic telescopic device can apply a force to the upper mounting frame and make the upper mounting frame tend to descend relative to the upper sealing mold.

[0009] When a lower elastic telescopic device is provided, the lower mounting frame can be raised and lowered relative to the lower sealing mold. The lower elastic telescopic device is provided between the lower mounting frame and the lower sealing mold. The lower elastic telescopic device can apply force to the lower mounting frame and make the lower mounting frame tend to rise relative to the lower sealing mold.

[0010] The above-mentioned angle positioning and sealing device includes an upper elastic telescopic device and / or a lower elastic telescopic device, and its specific solutions are: (1) both the upper elastic telescopic device and the lower elastic telescopic device are provided; or (2) only the upper elastic telescopic device is provided; or (3) only the lower elastic telescopic device is provided.

[0011] By providing a stop structure that cooperates with the elastic expansion device and supporting structure, the angle positioning sealing device can effectively prevent the upper and lower corresponding bag opening expansion members from colliding during sealing. The upper and lower elastic expansion devices also play a role in buffering and resetting.

[0012] When the above-mentioned angle positioning sealing device is working, before the upper sealing mold and the lower sealing mold are closed for sealing, the bag opening of the packaging bag containing the material enters between the upper sealing mold and the lower sealing mold, as well as between the upper negative pressure box and the lower negative pressure box; then the interior of the upper negative pressure box and the lower negative pressure box are evacuated to a negative pressure state, and the upper and lower sides of the bag opening of the packaging bag are respectively adsorbed on the lower surface of the upper negative pressure box and the upper surface of the lower negative pressure box, so that the bag opening of the packaging bag is roughly rectangular; then the upper lifting mechanism switches the upper left and upper right opening devices to positions corresponding to the upper left corner and upper right corners of the bag opening of the packaging bag, and the lower lifting mechanism switches the lower left and lower right opening devices to positions corresponding to the lower left corner and lower right corners of the bag opening of the packaging bag. corresponding positions; then, each stretching piece position switching device switches the position of each stretching piece, and the four stretching pieces enter the inner sides of the four corners of the bag opening of the packaging bag and hook the four corners of the bag opening of the packaging bag; then the upper lifting mechanism drives the upper left stretching device and the upper right stretching device to rise, and at the same time, the lower lifting mechanism drives the lower left stretching device and the lower right stretching device to descend, and the four stretching pieces completely stretch the bag opening of the packaging bag, and the stretching pieces of the upper left stretching device and the upper right stretching device jointly tighten the upper edge of the bag opening, and the stretching pieces of the lower left stretching device and the lower right stretching device jointly tighten the lower edge of the bag opening, and the upper left corner of the bag opening of the packaging bag is aligned with the lower left corner, and the upper right corner is aligned with the lower right corner, so that the upper side of the bag opening is aligned with the lower side of the bag opening.

[0013] Then the corner inserting and mold closing are carried out. At this time, under the drive of the corner inserting drive mechanism, the left corner inserting mechanism moves to the right and the right corner inserting mechanism moves to the left to insert the corner of the bag mouth. At the same time, the upper sealing mold and the lower sealing mold are closed and sealed. The upper sealing mold descends and drives the upper mounting frame, upper lifting mechanism, upper lifting seat, upper negative pressure box, upper left opening device, upper right opening device, etc. to descend together. At the same time, the lower sealing mold rises and drives the lower mounting frame, lower lifting mechanism, lower lifting seat, lower negative pressure box, lower left opening device, lower right opening device, etc. to rise together. During the entire process of corner inserting, mold closing and sealing, the four opening parts still hook the four corners of the bag mouth of the packaging bag, so that the upper side of the bag mouth is always aligned with the lower side of the bag mouth.

[0014] In the final stage of the gusset moulding and sealing, the stop structure prevents the upper mounting frame from further closing with the lower mounting frame (and also prevents other structures on the upper mounting frame from further closing with corresponding structures on the lower mounting frame), at this time, a certain gap is maintained between the upper negative pressure box and the lower negative pressure box, a certain distance is maintained between the left upper propelling member and the left lower propelling member, and between the right upper propelling member and the right lower propelling member, and the upper and lower corresponding propelling members will not collide. At this time, the upper mounting frame is lifted by a small distance relative to the upper sealing mould (the upper elastic stretching device is contracted), and / or the lower mounting frame is lowered by a small distance relative to the lower sealing mould (the lower elastic stretching device is contracted), so as not to hinder the completion of the sealing of the upper sealing mould and the lower sealing mould. After the upper sealing mould and the lower sealing mould are closed to complete the sealing, the position switching device switches the position of each propelling member, and switches each propelling member to the outside of the bag opening of the packaging bag. Then, the components of the gusset positioning and sealing device are reset (after the upper sealing mould and the lower sealing mould are separated, the upper elastic stretching device is stretched to lower the upper mounting frame relative to the upper sealing mould by a small distance, and / or the lower elastic stretching device is stretched to raise the lower mounting frame relative to the lower sealing mould by a small distance), preparing for the next sealing operation of the packaging bag.

[0015] In a preferred scheme, the above-mentioned stop structure includes at least one upper stop block and at least one lower stop block, the upper stop block is installed on the lower surface of the upper negative pressure box or the bottom of the upper mounting frame, the lower stop block is installed on the upper surface of the lower negative pressure box or the top of the lower mounting frame, the number of upper stop blocks is the same as that of lower stop blocks and one-to-one correspondence, and the lower end of the upper stop block is matched with the upper end of the lower stop block. In the final stage of the gusset moulding and sealing, the lower end of the upper stop block contacts with the upper end of the lower stop block, so as to maintain a certain gap between the upper negative pressure box and the lower negative pressure box. Generally, the upper stop block and the lower stop block are respectively provided with two.

[0016] In another preferred scheme, the above-mentioned stop structure includes at least one stop block, the stop block is installed on the lower surface of the upper negative pressure box or the bottom of the upper mounting frame, and the lower end of the stop block is matched with the upper surface of the lower negative pressure box or the top of the lower mounting frame. In the final stage of the gusset moulding and sealing, the lower end of the stop block contacts with the upper surface of the lower negative pressure box or the top of the lower mounting frame, so as to maintain a certain gap between the upper negative pressure box and the lower negative pressure box. Generally, the stop block is provided with two.

[0017] In another preferred scheme, the above-mentioned stop structure includes at least one stop block, the stop block is installed on the upper surface of the lower negative pressure box or the top of the lower mounting frame, and the upper end of the stop block is matched with the lower surface of the upper negative pressure box or the bottom of the upper mounting frame. In the final stage of the gusset moulding and sealing, the upper end of the stop block contacts with the lower surface of the upper negative pressure box or the bottom of the upper mounting frame, so as to maintain a certain gap between the upper negative pressure box and the lower negative pressure box. Generally, the stop block is provided with two.

[0018] In a preferred embodiment, when an upper elastic telescopic device is provided, the upper mounting frame includes an upper crossbar and two upper guide rods, the two upper guide rods extending vertically, the upper sealing die being provided with two upper guide through holes, the two upper guide rods being respectively located in the two upper guide through holes, the upper ends of the two upper guide rods being connected to the upper crossbar, and the lower ends of the two upper guide rods being connected to the upper negative pressure box; the upper and lower ends of the upper elastic telescopic device being respectively connected to or in close contact with the upper sealing die and the top of the upper negative pressure box. Furthermore, the upper mounting frame may further include an upper negative pressure box mounting seat, the upper negative pressure box being mounted on the upper negative pressure box mounting seat, the lower ends of the two upper guide rods being connected to the upper negative pressure box mounting seat, and the lower end of the upper elastic telescopic device being connected to or in close contact with the upper negative pressure box mounting seat.

[0019] In a more preferred embodiment, the upper elastic telescopic device includes two upper compression springs, each of which is respectively sleeved on two upper guide rods. The upper and lower ends of the upper compression springs are in close contact with the upper sealing mold and the top of the upper negative pressure box, respectively (if the upper mounting frame includes an upper negative pressure box mounting seat, the lower end of the upper elastic telescopic device is in close contact with the upper negative pressure box mounting seat). In addition, an upper limit member can be provided on the upper guide rod, and the upper limit member is located above the upper sealing mold. Preferably, the position of the upper limit member on the upper guide rod is adjustable, thereby adjusting the force exerted by the upper compression spring on the upper negative pressure box mounting seat or the upper negative pressure box in the initial state.

[0020] In another more preferred embodiment, the upper elastic expansion and contraction device includes at least one upper buffer, which is mounted on the upper crossbar, with its force-bearing end in close contact with the top of the upper negative pressure box (if the upper mounting frame includes an upper negative pressure box mounting seat, the force-bearing end of the upper buffer is in close contact with the upper negative pressure box mounting seat). For example, when the upper buffer is a hydraulic buffer or a pneumatic cylinder buffer, its cylinder body is mounted on the upper crossbar, its piston rod faces downward, and the lower end of the piston rod is in close contact with the top of the upper negative pressure box (if the upper mounting frame includes an upper negative pressure box mounting seat, the lower end of the piston rod is in close contact with the upper negative pressure box mounting seat).

[0021] In a preferred embodiment, when a lower elastic telescopic device is provided, the lower mounting frame includes a lower crossbar and two lower guide rods, the two lower guide rods extending vertically, the lower sealing mold being provided with two lower guide through holes, the two lower guide rods being respectively located in the two lower guide through holes, the lower ends of the two lower guide rods being connected to the lower crossbar, and the upper ends of the two lower guide rods being connected to the lower negative pressure box; the lower end and upper end of the lower elastic telescopic device being respectively connected to or in close contact with the lower sealing mold and the bottom of the lower negative pressure box. In addition, the lower mounting frame may further include a lower negative pressure box mounting seat, the lower negative pressure box being mounted on the lower negative pressure box mounting seat, the upper ends of the two lower guide rods being connected to the lower negative pressure box mounting seat, and the upper end of the lower elastic telescopic device being connected to or in close contact with the lower negative pressure box mounting seat.

[0022] In a more preferred embodiment, the lower elastic expansion and contraction device includes two lower compression springs, which are respectively sleeved on two lower guide rods. The lower and upper ends of the lower compression springs are respectively in close contact with the bottom of the lower sealing mold and the lower negative pressure box (when the lower mounting frame includes a lower negative pressure box mounting seat, the upper end of the lower compression spring is in close contact with the lower negative pressure box mounting seat). In addition, a lower limit member can be provided on the lower guide rod, and the lower limit member is located on the lower side of the lower sealing mold. Preferably, the position of the lower limit member on the lower guide rod is adjustable, thereby adjusting the force exerted by the lower compression spring on the lower negative pressure box mounting seat or the lower negative pressure box in the initial state.

[0023] In another more preferred embodiment, the lower elastic expansion and contraction device includes at least one lower buffer, which is mounted on the lower crossbar, with its force-bearing end in close contact with the bottom of the lower negative pressure box (if the lower mounting frame includes a lower negative pressure box mounting seat, the force-bearing end of the lower buffer is in close contact with the lower negative pressure box mounting seat). For example, the lower buffer can be a hydraulic buffer or a cylinder buffer, with its cylinder body mounted on the lower crossbar, its piston rod facing upward, and its upper end in close contact with the top of the lower negative pressure box (if the lower mounting frame includes a lower negative pressure box mounting seat, the upper end of the piston rod is in close contact with the lower negative pressure box mounting seat).

[0024] In a specific solution, the upper lifting mechanism includes an upper lifting cylinder, which is installed on an upper mounting frame, and the piston rod of the upper lifting cylinder faces downward and is connected to the upper lifting seat; the lower lifting mechanism includes a lower lifting cylinder, which is installed on a lower mounting frame, and the piston rod of the lower lifting cylinder faces upward and is connected to the lower lifting seat.

[0025] The upper and lower lifting mechanisms can also use electric motors (such as servo motors) as power sources to drive the upper and lower lifting seats to move up and down through transmission mechanisms (such as cam mechanisms, connecting rod mechanisms or screw / nut structures).

[0026] In the preferred embodiment, the upper lifting mechanism can drive the upper lifting seat and the upper left and upper right stretching devices to switch positions among three height positions; the lower lifting mechanism can drive the lower lifting seat and the lower left and lower right stretching devices to switch positions among three height positions, specifically: at the initial height position, the upper left and upper right stretching devices are on the upper side of the lower surface of the upper negative pressure box, and the lower left and lower right stretching devices are on the lower side of the upper surface of the lower negative pressure box, so that the four stretching devices will not hinder the bag opening of the packaging bag from smoothly entering between the upper negative pressure box and the lower negative pressure box; at the first working height position, after the upper and lower sides of the bag opening of the packaging bag are respectively adsorbed on the lower surface of the upper negative pressure box and the upper surface of the lower negative pressure box, the upper left and upper right stretching devices descend to slightly below the lower surface of the upper negative pressure box, and the lower left and lower right stretching devices rise to slightly Higher than the upper surface of the lower negative pressure box, the four expanding members of the expanding devices can smoothly enter the bag opening range of the packaging bag; at the second working height position, after the expanding members of the four expanding devices respectively enter the inner sides of the four corners of the bag opening of the packaging bag, the upper left expanding device and the upper right expanding device rise (the positions of the upper left expanding device and the upper right expanding device at this time are lower than their initial height positions), and the lower left expanding device and the lower right expanding device descend (the positions of the lower left expanding device and the lower right expanding device at this time are higher than their initial height positions), and jointly tighten the bag opening of the packaging bag (the four expanding members fully expand the bag opening of the packaging bag, the expanding members of the upper left expanding device and the upper right expanding device jointly tighten the upper edge of the bag opening, the expanding members of the lower left expanding device and the lower right expanding device jointly tighten the lower edge of the bag opening, and the upper left corner of the bag opening of the packaging bag is aligned with the lower left corner, and the upper right corner is aligned with the lower right corner). In order to switch between three height positions, when the power source is a cylinder, a double-stroke cylinder is used (that is, the above-mentioned upper lifting cylinder and lower lifting cylinder are both double-stroke cylinders), and when the power source is an electric motor, a servo motor is used.

[0027] Preferably, the upper lifting mechanism further comprises two upper guide posts and two upper guide sleeves, the two upper guide posts corresponding one-to-one with the two upper guide sleeves, the two upper guide posts being respectively arranged on either side of the upper lifting cylinder, the lower ends of the two upper guide posts being connected to the upper lifting seat, the two upper guide sleeves being both mounted on the upper mounting frame, and the upper guide posts being located in the corresponding upper guide sleeves. Alternatively, the upper lifting mechanism further comprises two upper guide posts and two upper guide sleeves, the two upper guide posts corresponding one-to-one with the two upper guide sleeves, the two upper guide posts being respectively arranged on either side of the upper lifting cylinder, the two upper guide posts being both mounted on the upper mounting frame, the two upper guide sleeves being both mounted on the upper lifting seat, and the upper guide posts being located in the corresponding upper guide sleeves.

[0028] Preferably, the lower lifting mechanism further comprises two lower guide columns and two lower guide sleeves, the two lower guide columns correspond to the two lower guide sleeves one by one, the two lower guide columns are respectively arranged on the two sides of the lower lifting cylinder, the upper ends of the two lower guide columns are connected with the lower lifting seat, the two lower guide sleeves are both mounted on the lower mounting frame, and the lower guide column is in the corresponding lower guide sleeve. Alternatively, the lower lifting mechanism further comprises two lower guide columns and two lower guide sleeves, the two lower guide columns correspond to the two lower guide sleeves one by one, the two lower guide columns are respectively arranged on the two sides of the lower lifting cylinder, the two lower guide columns are both mounted on the lower mounting frame, the two lower guide sleeves are both mounted on the lower lifting seat, and the lower guide column is in the corresponding lower guide sleeve.

[0029] In the preferred scheme, the upper lifting seat is provided with a first translation mechanism capable of adjusting the distance between the left upper spreading device and the right upper spreading device; and the lower lifting seat is provided with a second translation mechanism capable of adjusting the distance between the left lower spreading device and the right lower spreading device.

[0030] In the more preferred scheme, the first translation mechanism comprises a first servo motor, a first screw rod and two first nuts, the first screw rod is rotatably mounted on the upper lifting seat in the horizontal direction and is in transmission connection with the power output shaft of the first servo motor; the first screw rod is provided with a first forward threaded section and a first reverse threaded section, the two first nuts are respectively screwed with the first forward threaded section and the first reverse threaded section, and the left upper spreading device and the right upper spreading device are respectively mounted on the two first nuts; the second translation mechanism comprises a second servo motor, a second screw rod and two second nuts, the second screw rod is rotatably mounted on the lower lifting seat in the horizontal direction and is in transmission connection with the power output shaft of the second servo motor; the second screw rod is provided with a second forward threaded section and a second reverse threaded section, the two second nuts are respectively screwed with the second forward threaded section and the second reverse threaded section, and the left lower spreading device and the right lower spreading device are respectively mounted on the two second nuts. In the case that the left upper spreading device, the right upper spreading device, the left lower spreading device and the right lower spreading device all comprise a rotary driving device and a spreading piece, the rotary driving devices in the left upper spreading device and the right upper spreading device are respectively mounted on the two first nuts, and the rotary driving devices in the left lower spreading device and the right lower spreading device are respectively mounted on the two second nuts.

[0031] In the preferred embodiment, two upper air baffle adjustment plates are provided in the above-mentioned upper negative pressure box, and the two upper air baffle adjustment plates are arranged side by side on the left and right. A plurality of upper air suction holes arranged along the left and right directions are provided on the lower surface of the upper negative pressure box, and the upper air baffle adjustment plates are located on the upper side of the upper air suction holes, and the position of the upper air baffle adjustment plates in the left and right directions can be adjusted; two lower air baffle adjustment plates are provided in the lower negative pressure box, and the two lower air baffle adjustment plates are arranged side by side on the left and right. A plurality of lower air suction holes arranged along the left and right directions are provided on the upper surface of the lower negative pressure box, and the lower air baffle adjustment plates are located on the lower side of the lower air suction holes, and the position of the lower air baffle adjustment plates in the left and right directions can be adjusted. According to the size of the packaging bag, the positions of the two upper air baffle adjustment plates and the two lower air baffle adjustment plates in the left and right directions are adjusted to block part of the upper air suction holes on the left and right sides of the upper negative pressure box and part of the lower air suction holes on the left and right sides of the lower negative pressure box, so that the distribution range of the unblocked upper air suction holes in the middle of the upper negative pressure box and the unblocked lower air suction holes in the middle of the lower negative pressure box in the left and right directions matches the width of the upper and lower sides of the bag opening of the packaging bag. This can adapt to packaging bags of different sizes, make negative pressure adsorption smoother and reduce energy consumption.

[0032] In a specific solution, the above-mentioned expansion member position switching device is a rotary drive device, and one end of the expansion member is connected to the power output end of the rotary drive device.

[0033] The rotation drive device may be a rotary cylinder, with the expansion member mounted on the rotating shaft of the rotary cylinder. The rotation drive device may also be an electric motor, with the power output shaft of the electric motor driving the expansion member to rotate through a transmission mechanism (such as a speed reducer).

[0034] The aforementioned expansion member may be L-shaped, with the vertical side of the L-shaped expansion member mounted on the power output of the rotary drive device, and the horizontal side of the L-shaped expansion member rotated in a horizontal plane by the rotary drive device. The aforementioned expansion member may also be a horizontal rod, one end of which is connected to the power output of the rotary drive device, with the horizontal rod and the rotational axis of the power output of the rotary drive device (e.g., the rotation axis of a rotary cylinder) being perpendicular to each other.

[0035] In a specific solution, the upper sealing mold includes an upper sealing mold base and an upper heat sealing strip, which is installed on the upper sealing mold base; the lower sealing mold includes a lower sealing mold base and a lower heat sealing strip, which is installed on the lower sealing mold base, and the lower heat sealing strip corresponds to the upper heat sealing strip in position.

[0036] The driving mechanism for driving the upper sealing die and the lower sealing die to close the die and seal can adopt the existing technology, for example, reference can be made to the packaging bag sealing mechanism of Chinese utility model patent CN219728745 U.

[0037] The above-mentioned left corner insertion mechanism, right corner insertion mechanism and corner insertion drive mechanism can adopt existing technologies, such as: the left flat insert plate, right flat insert plate and their drive mechanism in Chinese utility model patent CN207644761U; the left corner insertion mechanism, right corner insertion mechanism and corner insertion drive mechanism in Chinese utility model patent CN206984536U.

[0038] The utility model provides a stop structure, which cooperates with the elastic telescopic device and the supporting structure, so that the corner positioning sealing device can effectively avoid the collision of the corresponding bag opening expansion members on the upper and lower sides when sealing, thereby ensuring the normal operation of the corner positioning sealing device and being conducive to extending the service life of the corner positioning sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a preferred embodiment 1 of the present invention;

[0040] Figure 2 yes Figure 1 Right view;

[0041] Figure 3 This is a schematic structural diagram of the upper negative pressure box in the preferred embodiment 1 of the present invention;

[0042] Figure 4 This is a schematic structural diagram of the lower negative pressure box in the preferred embodiment 1 of the present invention;

[0043] Figure 5 This is a schematic diagram of the position changes of the upper left spreading device, the upper right spreading device, the lower left spreading device, and the lower right spreading device in the preferred embodiment 1 of the present invention;

[0044] Figure 6 It is a structural diagram of preferred embodiment 2 of the present utility model. DETAILED DESCRIPTION

[0045] Example 1, as Figure 1 and Figure 2 As shown, the corner inserting and positioning sealing device for the packaging bag includes an upper sealing die 1, a lower sealing die 2, an upper negative pressure box 3, a lower negative pressure box 4, an upper left opening device 5, an upper right opening device 6, a lower left opening device 7, a lower right opening device 8, a left corner inserting mechanism 9, a right corner inserting mechanism 10, a corner inserting drive mechanism (not shown), an upper mounting frame 11, an upper lifting mechanism 12, an upper lifting seat 13, a lower mounting frame 14, a lower lifting mechanism 15, a lower lifting seat 16, a stop structure, an upper elastic telescopic device 17, and a lower elastic telescopic device 18.

[0046] The upper sealing mold 1 is located above the lower sealing mold 2; an upper air suction hole 31 is provided on the lower surface of the upper negative pressure box 3, and a lower air suction hole 41 is provided on the upper surface of the lower negative pressure box 4; the upper left expansion device 5, the upper right expansion device 6, the lower left expansion device 7, and the lower right expansion device 8 all include an expansion member 51 and an expansion member position switching device 52, and the expansion member 51 is connected to the power output end of the expansion member position switching device 52; the left angle insertion mechanism 9 and the right angle insertion mechanism 10 are respectively located on the left and right sides of the upper sealing mold 1 and the lower sealing mold 2, and the left angle insertion mechanism 9 and the right angle insertion mechanism 10 are both installed on the power output end of the angle insertion drive mechanism.

[0047] The upper mounting frame 11 is installed on the upper sealing mold 1, the upper lifting mechanism 12 is installed on the upper mounting frame 11, the upper lifting seat 13 is connected to the power output end of the upper lifting mechanism 12, the upper left opening device 5 and the upper right opening device 6 are installed on the upper lifting seat 13, and the upper negative pressure box 3 is installed at the bottom of the upper mounting frame 11; the upper mounting frame 11 can be lifted and lowered relative to the upper sealing mold 1, and the upper elastic telescopic device 17 is arranged between the upper mounting frame 11 and the upper sealing mold 1. The upper elastic telescopic device 17 can apply force to the upper mounting frame 11 and make the upper mounting frame 11 have a tendency to descend relative to the upper sealing mold 1.

[0048] The lower mounting frame 14 is installed on the lower sealing mold 2, the lower lifting mechanism 15 is installed on the lower mounting frame 14, the lower lifting seat 16 is connected to the power output end of the lower lifting mechanism 15, the lower left opening device 7 and the lower right opening device 8 are installed on the lower lifting seat 15, and the lower negative pressure box 4 is installed on the top of the lower mounting frame 14; the lower mounting frame 14 can be lifted and lowered relative to the lower sealing mold 2, and the lower elastic telescopic device 18 is arranged between the lower mounting frame 14 and the lower sealing mold 2. The lower elastic telescopic device 18 can apply force to the lower mounting frame 14 and make the lower mounting frame 14 have a tendency to rise relative to the lower sealing mold 2.

[0049] In this embodiment, the stop structure is disposed between the upper negative pressure box 3 and the lower negative pressure box 4; the stop structure includes two upper stop blocks 19 and two lower stop blocks 20. The upper stop blocks 19 are mounted on the lower surface of the upper negative pressure box 3, and the lower stop blocks 20 are mounted on the upper surface of the lower negative pressure box 4. The upper stop blocks 19 correspond to the lower stop blocks 20 one-to-one, and the lower ends of the upper stop blocks 19 correspond to the upper ends of the lower stop blocks 20. The stop structure can also be disposed between the bottom of the upper mounting frame and the top of the lower mounting frame, wherein the upper stop blocks are mounted on the bottom of the upper mounting frame and the lower stop blocks are mounted on the top of the lower mounting frame.

[0050] In this embodiment, the upper mounting frame 11 includes an upper cross bar 111 and two upper guide rods 112. The two upper guide rods 112 are in an up-and-down direction. The upper sealing mold 1 is provided with two upper guide through holes 21. The two upper guide rods 112 are respectively located in the two upper guide through holes 21. The upper ends of the two upper guide rods 112 are connected to the upper cross bar 111, and the lower ends of the two upper guide rods 112 are connected to the upper negative pressure box 3; the upper elastic telescopic device 17 includes two upper compression springs 171 and 172. The two upper compression springs 171 and 172 are respectively sleeved on the two upper guide rods 112. The upper and lower ends of the upper compression springs 171 and 172 are respectively in close contact with the upper sealing mold 1 and the top of the upper negative pressure box 3.

[0051] In addition, an upper limit component 22 is provided on the upper guide rod 112, and the upper limit component 22 is located on the upper side of the upper sealing mold 1. The position of the upper limit component 22 on the upper guide rod 111 is adjustable, thereby adjusting the force exerted by the upper compression springs 171 and 172 on the upper negative pressure box 3 in the initial state.

[0052] In this embodiment, the lower mounting frame 14 includes a lower cross bar 141 and two lower guide rods 142. The two lower guide rods 141 are in an up-and-down direction. Two lower guide through holes 23 are provided on the lower sealing mold 2. The two lower guide rods 141 are respectively located in the two lower guide through holes 23. The lower ends of the two lower guide rods 141 are connected to the lower cross bar 141, and the upper ends of the two lower guide rods 142 are respectively connected to the lower negative pressure box 4; the lower elastic telescopic device 18 includes two lower compression springs 181 and 182. The two lower compression springs 181 and 182 are respectively sleeved on the two lower guide rods 142, and the lower and upper ends of the lower compression springs 181 and 182 are in close contact with the bottom of the lower sealing mold 2 and the lower negative pressure box 4 respectively.

[0053] In addition, a lower limit member 24 is provided on the lower guide rod 142, and is located on the lower side of the lower sealing mold. The position of the lower limit member 24 on the lower guide rod 142 is adjustable, thereby adjusting the force exerted by the lower compression springs 181, 182 on the lower negative pressure box 4 in the initial state.

[0054] refer to Figure 5 In this embodiment, the upper lifting mechanism 12 can drive the upper lifting seat 13 and the upper left opening device 5 and the upper right opening device 6 to switch positions between three height positions; the lower lifting mechanism 15 can drive the lower lifting seat 16 and the lower left opening device 7 and the lower right opening device 8 to switch positions between three height positions, specifically: Figure 5(a), at the initial height position, the upper left opening device 5 and the upper right opening device 6 are located on the upper side of the lower surface of the upper negative pressure box 3, and the lower left opening device 7 and the lower right opening device 8 are located on the lower side of the upper surface of the lower negative pressure box 4, so that the four opening devices will not hinder the bag opening of the packaging bag from smoothly entering between the upper negative pressure box 3 and the lower negative pressure box 4; at the first working height position, after the upper and lower sides of the bag opening of the packaging bag are respectively adsorbed on the lower surface of the upper negative pressure box 3 and the upper surface of the lower negative pressure box 4, refer to Figure 5 (b), the upper left opening device 5 and the upper right opening device 6 are lowered to a position slightly lower than the lower surface of the upper negative pressure box 3, and the lower left opening device 7 and the lower right opening device 8 are raised to a position slightly higher than the upper surface of the lower negative pressure box 4, so that the opening members 51 of the four opening devices can smoothly enter the bag opening range of the packaging bag; at the second working height position, after the opening members 51 of the four opening devices respectively enter the inner sides of the four corners of the bag opening of the packaging bag (refer to Figure 5 (c)), reference Figure 5 (d), the upper left stretching device 5 and the upper right stretching device 6 rise (the positions of the upper left stretching device 5 and the upper right stretching device 6 at this time are lower than their initial height positions), and the lower left stretching device 7 and the lower right stretching device 8 fall (the positions of the lower left stretching device 7 and the lower right stretching device 8 at this time are higher than their initial height positions), and jointly tighten the bag opening of the packaging bag (the four stretching members 51 fully stretch the bag opening of the packaging bag, the stretching members 51 of the upper left stretching device 5 and the upper right stretching device 6 jointly tighten the upper edge of the bag opening, and the stretching members 51 of the lower left stretching device 7 and the lower right stretching device 8 jointly tighten the lower edge of the bag opening, and the upper left corner of the bag opening of the packaging bag is aligned with the lower left corner, and the upper right corner is aligned with the lower right corner). After the corner mold is closed and sealed, the opening members 51 of the four opening devices are removed from the bag opening, the upper left opening device 5 and the upper right opening device 6 rise, the lower left opening device 7 and the lower right opening device 8 fall, and the upper left opening device 5, the upper right opening device 6, the lower left opening device 7, and the lower right opening device 8 all return to their initial height positions (reference Figure 5 (a)).

[0055] In this embodiment, the upper lifting mechanism 12 includes an upper lifting cylinder 121, which is mounted on the upper mounting frame 11. The piston rod of the upper lifting cylinder 121 faces downward and is connected to the upper lifting seat 13. The lower lifting mechanism 15 includes a lower lifting cylinder 151, which is mounted on the lower mounting frame 14. The piston rod of the lower lifting cylinder 151 faces upward and is connected to the lower lifting seat 16. The upper lifting cylinder 121 and the lower lifting cylinder 151 are both two-stroke cylinders, and their strokes are selected based on the initial height position, the first working height position, and the second working height position of the upper left opening device 5, the upper right opening device 6, the lower left opening device 7, and the lower right opening device 8.

[0056] The up-and-down mechanism 12 further comprises two upper guide columns 122 and two upper guide sleeves 123, the two upper guide columns 122 and the two upper guide sleeves 123 are in one-to-one correspondence, the two upper guide columns 122 are respectively arranged on the two sides of the up-and-down cylinder 121, the lower ends of the two upper guide columns 122 are connected with the up-and-down seat 13, and the two upper guide sleeves 123 are installed on the upper mounting frame 11, and the upper guide column 122 is in the corresponding upper guide sleeve 123.

[0057] The down-and-down mechanism 15 further comprises two lower guide columns 152 and two lower guide sleeves 153, the two lower guide columns 152 and the two lower guide sleeves 153 are in one-to-one correspondence, the two lower guide columns 152 are respectively arranged on the two sides of the down-and-down cylinder 151, the upper ends of the two lower guide columns 152 are connected with the down-and-down seat 16, and the two lower guide sleeves 153 are installed on the lower mounting frame 14, and the lower guide column 152 is in the corresponding lower guide sleeve 153.

[0058] In the embodiment, the position switching device 52 of the strutting member is a rotary driving device, one end of the strutting member 51 is connected with the power output end of the rotary driving device. The rotary driving device can be a rotary cylinder, and the strutting member 51 is installed on the rotating shaft of the rotary cylinder. The strutting member 51 is in L shape, the vertical side of the L-shaped strutting member is installed on the power output end of the rotary driving device, and the horizontal side of the L-shaped strutting member is rotated in the horizontal plane through the action of the rotary driving device.

[0059] In the embodiment, the up-and-down seat 13 is provided with a first translation mechanism 25 capable of adjusting the distance between the left upper strutting device 5 and the right upper strutting device 6; and the down-and-down seat 16 is provided with a second translation mechanism 26 capable of adjusting the distance between the left lower strutting device 7 and the right lower strutting device 8. The distance between the left upper strutting device 5 and the right upper strutting device 6 can be adjusted through the first translation mechanism 25, and the distance between the left lower strutting device 7 and the right lower strutting device 8 can be adjusted through the second translation mechanism 26, so as to match the size of the bag opening of the packaging bag.

[0060] The first translation mechanism 25 comprises a first servo motor 251, a first screw rod 252 and two first nuts 253, 254. The first screw rod 252 is rotatably installed on the upper lifting seat 13 in a horizontal direction and is in transmission connection with a power output shaft of the first servo motor 251. The first screw rod 251 is provided with a first positive thread segment and a first reverse thread segment. The two first nuts 253, 254 are respectively screwed with the first positive thread segment and the first reverse thread segment. The left upper spreading device 5 and the right upper spreading device 6 are respectively installed on the two first nuts 253, 254. The second translation mechanism 26 comprises a second servo motor 261, a second screw rod 262 and two second nuts 263, 264. The second screw rod 262 is rotatably installed on the lower lifting seat 16 in a horizontal direction and is in transmission connection with a power output shaft of the second servo motor 261. The second screw rod 262 is provided with a second positive thread segment and a second reverse thread segment. The two second nuts 263, 264 are respectively screwed with the second positive thread segment and the second reverse thread segment. The left lower spreading device 7 and the right lower spreading device 8 are respectively installed on the two second nuts 263, 264. In the case that the left upper spreading device 5, the right upper spreading device 6, the left lower spreading device 7 and the right lower spreading device 8 all comprise rotary driving devices and spreading members 51, the rotary driving devices in the left upper spreading device 5 and the right upper spreading device 6 are respectively installed on the two first nuts 253, 254. The rotary driving devices in the left lower spreading device 7 and the right lower spreading device 8 are respectively installed on the two second nuts 263, 264.

[0061] Reference Figure 3 and Figure 4In this embodiment, two upper air baffle adjustment plates 32 are provided in the upper negative pressure box 3, and the two upper air baffle adjustment plates 32 are arranged side by side on the left and right. A plurality of upper air suction holes 31 arranged along the left and right directions are provided on the lower surface of the upper negative pressure box 3, and the upper air baffle adjustment plates 32 are located on the upper side of the upper air suction holes 31, and the position of the upper air baffle adjustment plates 32 in the left and right directions can be adjusted; two lower air baffle adjustment plates 42 are provided in the lower negative pressure box 4, and the two lower air baffle adjustment plates 42 are arranged side by side on the left and right. A plurality of lower air suction holes 41 arranged along the left and right directions are provided on the upper surface of the lower negative pressure box 4, and the lower air baffle adjustment plates 42 are located on the lower side of the lower air suction holes 41, and the position of the lower air baffle adjustment plates 42 in the left and right directions can be adjusted. According to the size of the packaging bag, the positions of the two upper air-blocking adjustment plates 32 and the two lower air-blocking adjustment plates 42 in the left-right direction can be adjusted to block part of the upper air-intake holes 31 on the left and right sides of the upper negative pressure box 3 and part of the lower air-intake holes 41 on the left and right sides of the lower negative pressure box 4, so that the left-right ranges of the upper air-intake holes 31 in the middle of the upper negative pressure box 3 and the lower air-intake holes 41 in the middle of the lower negative pressure box 4 match the widths of the upper and lower sides of the packaging bag opening. In the specific design, an upper slide 33 running left and right can be provided on the upper negative pressure box, and the two upper air-blocking adjustment plates 32 can move along the upper slide 33 and be fixed after being moved into place; similarly, a lower slide 43 running left and right can be provided on the lower negative pressure box 4, and the two lower air-blocking adjustment plates 42 can move along the lower slide 43 and be fixed after being moved into place. In addition, an upper air suction port 34 is provided on the upper negative pressure box 3, and the upper air suction port 34 and each upper air suction hole 31 are connected to the cavity of the upper negative pressure box 3; a lower air suction port 44 is provided on the lower negative pressure box 4, and the lower air suction port 44 and each lower air suction hole 41 are connected to the cavity of the lower negative pressure box 4.

[0062] In this embodiment, the upper sealing mold 1 includes an upper sealing mold base 101 and an upper heat sealing strip 102, and the upper heat sealing strip 102 is installed on the upper sealing mold base 101; the lower sealing mold 2 includes a lower sealing mold base 201 and a lower heat sealing strip 202, and the lower heat sealing strip 202 is installed on the lower sealing mold base 201, and the position of the lower heat sealing strip 202 corresponds to that of the upper heat sealing strip 102.

[0063] The following is a brief description of the working principle of this angle positioning sealing device:

[0064] refer to Figure 5 (a) During operation, before the upper sealing die 1 and the lower sealing die 2 are closed and sealed, the bag opening 30 of the packaging bag containing the material enters between the upper sealing die 1 and the lower sealing die 2, and between the upper negative pressure box 3 and the lower negative pressure box 4; then the interior of the upper negative pressure box 3 and the lower negative pressure box 4 are evacuated to a negative pressure state, and the upper and lower sides of the bag opening 30 of the packaging bag are respectively adsorbed on the lower surface of the upper negative pressure box 3 and the upper surface of the lower negative pressure box 4, so that the bag opening 30 of the packaging bag is roughly rectangular; refer to Figure 5(b), then the lifting and lowering mechanism 12 switches the left upper opening device 5 and the right upper opening device 6 to the positions corresponding to the left upper corner and the right upper corner of the bag opening 30, and the lower lifting and lowering mechanism 15 switches the left lower opening device 7 and the right lower opening device 8 to the positions corresponding to the left lower corner and the right lower corner of the bag opening 30; refer to Figure 5 (c), then the position switching device switches the positions of the four opening members 51, and the four opening members 51 enter the inner sides of the four corners of the bag opening 30 and hook the four corners of the bag opening 30; refer to Figure 5 (d), then the lifting and lowering mechanism 12 drives the left upper opening device 5 and the right upper opening device 6 to rise, and the lower lifting and lowering mechanism 15 drives the left lower opening device 7 and the right lower opening device 8 to descend, and the four opening members 51 completely open the bag opening 30, the opening members 51 of the left upper opening device 5 and the right upper opening device 6 jointly tension the upper side of the bag opening, and the opening members of the left lower opening device 7 and the right lower opening device 8 jointly tension the lower side of the bag opening, so that the left upper corner and the left lower corner of the bag opening 30 are aligned, and the right upper corner and the right lower corner are aligned, thereby aligning the upper side of the bag opening with the lower side of the bag opening.

[0065] Then the corner insertion and mold closing and sealing are performed, at this time, under the driving of the corner insertion driving mechanism, the left corner insertion mechanism 9 moves to the right and the right corner insertion mechanism 10 moves to the left, the bag opening 30 is inserted with corners, and the upper sealing mold 1 and the lower sealing mold 2 are closed and sealed, the upper sealing mold 1 descends and drives the upper mounting frame 11, the lifting and lowering mechanism 12, the lifting and lowering seat 13, the upper negative pressure box 3, the left upper opening device 5, the right upper opening device 6, etc. to descend, and the lower sealing mold 2 rises and drives the lower mounting frame 14, the lower lifting and lowering mechanism 15, the lower lifting and lowering seat 16, the lower negative pressure box 4, the left lower opening device 7, the right lower opening device 8, etc. to rise, and the four opening members 51 still hook the four corners of the bag opening 30 during the entire corner insertion and mold closing and sealing process, so that the upper side of the bag opening always aligns with the lower side of the bag opening.

[0066] In the final stage of the gusset closing, the lower end of the upper stopper 19 contacts the upper end of the lower stopper 20, preventing the upper mounting frame 11 and the lower mounting frame 14 from further closing (and also preventing other structures on the upper mounting frame from further closing with corresponding structures on the lower mounting frame), at this time, a certain gap is maintained between the upper negative pressure box 3 and the lower negative pressure box 4, and a certain distance is maintained between the left upper opening device 5 and the left lower opening device 7, and between the right upper opening device 6 and the right lower opening device 8, and the upper and lower corresponding opening devices 51 will not collide; At this time, the upper mounting frame 11 rises a small distance relative to the upper closing mold 1 (the two upper compression springs 171, 172 contract), and the lower mounting frame 14 descends a small distance relative to the lower closing mold 2 (the two lower compression springs 181, 182 contract), so as not to hinder the closing of the upper closing mold 1 and the lower closing mold 2. After the upper closing mold 1 and the lower closing mold 2 are closed to complete the sealing, the position switching device switches the position of each opening device 51, and switches each opening device 51 to the outside of the bag opening; Subsequently, the gusset positioning and sealing device resets each component (after the upper closing mold 1 and the lower closing mold 2 are separated, the two upper compression springs 171, 172 extend to make the upper mounting frame 11 descend a small distance relative to the upper closing mold 1, and the two lower compression springs 181, 182 extend to make the lower mounting frame 14 ascend a small distance relative to the lower closing mold 2), preparing for the next bag sealing operation.

[0067] Example 2, reference Figure 6 The gusset positioning and sealing device of the packaging bag of the present embodiment is mainly different from that of Example 1:

[0068] (1) Only the upper elastic extension device 17 (the upper mounting frame can be raised and lowered relative to the upper closing mold) is provided, and no lower elastic extension device is provided (the lower mounting frame 14 is fixedly installed on the lower closing mold 2);

[0069] (2) The upper elastic extension device 17 uses two buffers instead of the two upper compression springs in Example 1, specifically: the upper elastic extension device 17 includes two upper buffers 173, 174, the upper buffers 173, 174 are installed on the upper horizontal rod 111, and the force receiving end of the upper buffers 173, 174 is in close contact with the top of the upper negative pressure box 3. The upper buffers 173, 174 are hydraulic buffers or cylinder type buffers, the cylinder body is installed on the upper horizontal rod 111, the piston rod is downward, and the lower end of the piston rod is in close contact with the top of the upper negative pressure box 3;

[0070] (3) The specific structure of the stop structure is different. Specifically, the stop structure includes two stop blocks 27. The stop blocks 27 are installed on the upper surface of the lower negative pressure box 4, and the upper ends of the stop blocks 27 correspond to the lower surface of the upper negative pressure box 3. In the final stage of the corner mold closing and sealing, the upper ends of the stop blocks 27 contact the lower surface of the upper negative pressure box 3, so that a certain gap is maintained between the upper negative pressure box 3 and the lower negative pressure box 4.

[0071] The rest of the structure of Example 2 can refer to Example 1.

[0072] In other embodiments, the stop structure may include at least one stop block mounted on the lower surface of the upper negative pressure box or the bottom of the upper mounting frame, with the lower end of the stop block correspondingly mating with the upper surface of the lower negative pressure box or the top of the lower mounting frame. During the final stage of the gusseted mold closing and sealing, the lower end of the stop block contacts the upper surface of the lower negative pressure box or the top of the lower mounting frame, maintaining a certain gap between the upper and lower negative pressure boxes.

[0073] In other embodiments, only a lower elastic telescopic device may be provided (the lower mounting frame can be raised and lowered relative to the lower sealing mold), without an upper elastic telescopic device (the upper mounting frame is fixedly mounted on the upper sealing mold).

Claims

1. A corner positioning and sealing device for a packaging bag, comprising an upper sealing die, a lower sealing die, an upper negative pressure box, a lower negative pressure box, an upper left opening device, an upper right opening device, a lower left opening device, a lower right opening device, a left corner mechanism, a right corner mechanism and a corner driving mechanism; the upper sealing die is located above the lower sealing die; an upper air suction hole is provided on the lower surface of the upper negative pressure box, and a lower air suction hole is provided on the upper surface of the lower negative pressure box; the upper left opening device, the upper right opening device, the lower left opening device and the lower right opening device all include a spreading member and a spreading member position switching device, and the spreading member is connected to the power output end of the spreading member position switching device; the left corner mechanism and the right corner mechanism are respectively located on the left and right sides of the upper sealing die and the lower sealing die, and the left corner mechanism and the right corner mechanism are both installed on the power output end of the corner driving mechanism, characterized in that: The insert angle positioning and sealing device also includes an upper mounting frame, an upper lifting mechanism, an upper lifting seat, a lower mounting frame, a lower lifting mechanism, a lower lifting seat and a stop structure; the upper mounting frame is mounted on the upper sealing mold, the upper lifting mechanism is mounted on the upper mounting frame, the upper lifting seat is connected to the power output end of the upper lifting mechanism, the upper left opening device and the upper right opening device are mounted on the upper lifting seat, and the upper negative pressure box is mounted on the bottom of the upper mounting frame; the lower mounting frame is mounted on the lower sealing mold, the lower lifting mechanism is mounted on the lower mounting frame, the lower lifting seat is connected to the power output end of the lower lifting mechanism, the lower left opening device and the lower right opening device are mounted on the lower lifting seat, and the lower negative pressure box is mounted on the top of the lower mounting frame; the stop structure is arranged between the upper negative pressure box and the lower negative pressure box, or between the bottom of the upper mounting frame and the top of the lower mounting frame; The angle positioning and sealing device further comprises an upper elastic telescopic device and / or a lower elastic telescopic device; When an upper elastic telescopic device is provided, the upper mounting frame can be raised and lowered relative to the upper sealing mold. The upper elastic telescopic device is provided between the upper mounting frame and the upper sealing mold. The upper elastic telescopic device can apply a force to the upper mounting frame and make the upper mounting frame tend to descend relative to the upper sealing mold. When a lower elastic telescopic device is provided, the lower mounting frame can be raised and lowered relative to the lower sealing mold. The lower elastic telescopic device is provided between the lower mounting frame and the lower sealing mold. The lower elastic telescopic device can apply force to the lower mounting frame and make the lower mounting frame tend to rise relative to the lower sealing mold.

2. The corner positioning and sealing device for packaging bags according to claim 1, characterized in that: The stop structure includes at least one upper stop block and at least one lower stop block, the upper stop block is mounted on the lower surface of the upper negative pressure box or the bottom of the upper mounting frame, and the lower stop block is mounted on the upper surface of the lower negative pressure box or the top of the lower mounting frame. The upper stop blocks are the same in number and correspond one to one, and the lower end of the upper stop block corresponds to the upper end of the lower stop block; Alternatively, the stop structure includes at least one stop block, which is mounted on the lower surface of the upper negative pressure box or the bottom of the upper mounting frame, and the lower end of the stop block corresponds to the upper surface of the lower negative pressure box or the top of the lower mounting frame; Alternatively, the stop structure includes at least one stop block, which is installed on the upper surface of the lower negative pressure box or the top of the lower mounting frame, and the upper end of the stop block corresponds to the lower surface of the upper negative pressure box or the bottom of the upper mounting frame.

3. The corner positioning and sealing device for packaging bags according to claim 1 or 2, characterized in that: When an upper elastic telescopic device is provided, the upper mounting frame includes an upper cross bar and two upper guide rods. The two upper guide rods are in an up-and-down direction. Two upper guide through holes are provided on the upper sealing mold. The two upper guide rods are respectively located in the two upper guide through holes. The upper ends of the two upper guide rods are connected to the upper cross bar, and the lower ends of the two upper guide rods are connected to the upper negative pressure box. The upper end and the lower end of the upper elastic telescopic device are respectively connected to or in close contact with the upper sealing mold and the top of the upper negative pressure box. When a lower elastic telescopic device is provided, the lower mounting frame includes a lower cross bar and two lower guide rods. The two lower guide rods are in an up-and-down direction. Two lower guide through holes are provided on the lower sealing mold. The two lower guide rods are respectively located in the two lower guide through holes. The lower ends of the two lower guide rods are connected to the lower cross bar, and the upper ends of the two lower guide rods are connected to the lower negative pressure box. The lower end and the upper end of the lower elastic telescopic device are respectively connected to or in close contact with the lower sealing mold and the bottom of the lower negative pressure box.

4. The corner positioning and sealing device for packaging bags according to claim 3, characterized in that: The upper mounting frame also includes an upper negative pressure box mounting seat, the upper negative pressure box is mounted on the upper negative pressure box mounting seat, the lower ends of the two upper guide rods are connected to the upper negative pressure box mounting seat, and the lower end of the upper elastic telescopic device is connected to or in close contact with the upper negative pressure box mounting seat; The lower mounting frame also includes a lower negative pressure box mounting seat, the lower negative pressure box is mounted on the lower negative pressure box mounting seat, the upper ends of the two lower guide rods are connected to the lower negative pressure box mounting seat, and the upper end of the lower elastic telescopic device is connected to or in close contact with the lower negative pressure box mounting seat.

5. The corner positioning and sealing device for packaging bags according to claim 3, characterized in that: The upper elastic telescopic device includes two upper compression springs, which are respectively sleeved on the two upper guide rods, and the upper and lower ends of the upper compression springs are in close contact with the upper sealing mold and the top of the upper negative pressure box respectively; the lower elastic telescopic device includes two lower compression springs, which are respectively sleeved on the two lower guide rods, and the lower and upper ends of the lower compression springs are in close contact with the lower sealing mold and the bottom of the lower negative pressure box respectively; Alternatively, the upper elastic telescopic device includes at least one upper buffer, which is installed on the upper cross bar, and the force-bearing end of the upper buffer is in close contact with the top of the upper negative pressure box; the lower elastic telescopic device includes at least one lower buffer, which is installed on the lower cross bar, and the force-bearing end of the lower buffer is in close contact with the bottom of the lower negative pressure box.

6. The corner positioning and sealing device for packaging bags according to claim 1 or 2, characterized in that: The spreading member position switching device is a rotary drive device, and one end of the spreading member is connected to the power output end of the rotary drive device.

7. The corner positioning and sealing device for packaging bags according to claim 1 or 2, characterized in that: The upper lifting mechanism can drive the upper lifting seat and the upper left and upper right spreading devices to switch positions among three height positions; the lower lifting mechanism can drive the lower lifting seat and the lower left and lower right spreading devices to switch positions among three height positions.

8. The corner positioning and sealing device for packaging bags according to claim 7, characterized in that: The upper lifting mechanism includes an upper lifting cylinder, which is installed on the upper mounting frame, and the piston rod of the upper lifting cylinder is downward and connected to the upper lifting seat; the lower lifting mechanism includes a lower lifting cylinder, which is installed on the lower mounting frame, and the piston rod of the lower lifting cylinder is upward and connected to the lower lifting seat; the upper lifting cylinder and the lower lifting cylinder are both double-stroke cylinders.

9. The corner positioning and sealing device for packaging bags according to claim 1 or 2, characterized in that: The upper lifting seat is provided with a first translation mechanism capable of adjusting the distance between the upper left opening device and the upper right opening device; the lower lifting seat is provided with a second translation mechanism capable of adjusting the distance between the lower left opening device and the lower right opening device.

10. The corner positioning and sealing device for packaging bags according to claim 1 or 2, characterized in that: The upper negative pressure box is provided with two upper air baffle adjustment plates, which are arranged side by side on the left and right. A plurality of upper air intake holes arranged along the left and right directions are provided on the lower surface of the upper negative pressure box, and the upper air baffle adjustment plates are located on the upper side of the upper air intake holes. The positions of the upper air baffle adjustment plates in the left and right directions are adjustable; the lower negative pressure box is provided with two lower air baffle adjustment plates, which are arranged side by side on the left and right. A plurality of lower air intake holes arranged along the left and right directions are provided on the upper surface of the lower negative pressure box, and the lower air baffle adjustment plates are located on the lower side of the lower air intake holes. The position of the lower air baffle adjustment plates in the left and right directions is adjustable.

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