A step-by-step adjustment structure and adjustment method for a printing thermoforming material alignment and forming device

Abstract

A step-by-step adjustment structure and adjustment method for a printing thermoforming material alignment forming device, the structure of which includes a dynamic clamping group driving device arranged on a machine body, two power shafts connected to the dynamic clamping group driving device are slidably installed on the machine body through two guide seats, a front dynamic clamping group and a rear dynamic clamping group are arranged on the two power shafts, and the rear dynamic clamping group is fixed on the two power shafts; the front dynamic clamping group includes two fixed blocks and a sliding frame, an adjustment motor is fixed on the fixed block, the sliding frame is sleeved on the two power shafts and connected with a transmission angle plate, a front swing rod is symmetrically hinged on the sliding frame, a clamping block is respectively arranged at the upper end of the front swing rod, a front clamping cylinder is arranged in the connecting angle plate, the upper end of the front clamping cylinder passes through the connecting angle plate and is respectively hinged with the lower end of the front swing rod; the adjustment motor is connected to the transmission angle plate in a transmission manner. The invention has reliable operation, convenient adjustment, small alignment deviation, high production efficiency, can make the position of the formed bubble cavity correspond to the printed pattern one by one, and improve the aesthetics of the product.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging, and particularly relates to a step-by-step adjustment structure and an adjustment method for a printing thermoforming material alignment forming device that realizes one-to-one correspondence between formed bubbles and printed patterns during the forming process of a printed plastic composite film. Background Art

[0002] At present, there are many equipments for plastic composite film blow molding, which are mainly composed of more than ten systems such as equipment body, packaging material unwinding, clamping stepping device, heating device, molding device, metering and filling device, sealing device, coding device, punching and feeding device, punching and cutting device, finished product output and waste collection device, etc., which complete the whole process from incoming materials to finished product packaging and conveying the finished packaged products out of the equipment in sequence, and are widely used in the packaging of medicines, foods, health products, chemicals and daily chemical products. With the rapid development of the packaging industry, the market has higher and higher requirements for the quality of product packaging, which not only requires packaging quality and packaging form, but also meets the visual requirements of packaging. The complete printing pattern corresponds to the formed bubble of the finished packaging product one by one, that is, each independent finished packaging unit is required to have a complete printing pattern.

[0003] However, during the product packaging production process, the position of the formed bubble of the packaging material and the printed pattern are prone to deviation, affecting the aesthetics of the final packaging product. The main reasons are as follows: First, the deviation of the packaging material production results; that is, during the production process of packaging materials, such as production and processing, surface printing, etc., due to the influence of their respective production processes and printing processes, as well as the particularity of the materials, there are always changes in extension or contraction, and there are no rules to be found; second, the deformation caused by the packaging material during the thermoforming process; that is, due to the influence of the material being heated and its own internal stress, there will also be different changes in the amount of extension / contraction. These changes, whether they are thermal deformation caused by external factors during the material production and processing, printing process, or thermoforming process, will eventually cause deviations in the printed material during the molding and alignment, and the impact is great. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a step-by-step adjustment structure and method for a printing thermoforming material alignment forming device that is reliable in operation, convenient in adjustment, has small alignment deviation, and high in production efficiency, which can make the formed bubble positions of the packaging material correspond one-to-one with the printed pattern, thereby improving the aesthetics of the final packaging product.

[0005] The technical solution of the present invention is as follows:

[0006] A step-by-step adjustment structure for a printing thermoforming material alignment and forming device comprises a dynamic clamping group driving device arranged on a machine body, two mutually parallel power shafts are slidably mounted on the machine body through two guide seats, the dynamic clamping group driving device is transmission-connected with the two power shafts, and is used to drive the two power shafts to reciprocate horizontally along their axial directions; the special feature is that a front dynamic clamping group and a rear dynamic clamping group arranged left and right are arranged on the two power shafts, and the rear dynamic clamping group is fixed on the two power shafts, and is used to clamp the packaging material to realize the feeding of the packaging material;

[0007] The front dynamic clamping group includes two fixed blocks and a sliding frame, the two fixed blocks are symmetrically clamped on the two power shafts, and an adjustment motor is fixed on the two fixed blocks between the two power shafts. The sliding frame is mounted on the two power shafts and is connected with a transmission angle plate, and two pairs of front swing arms are symmetrically hinged on the sliding frame, and corresponding clamping blocks are respectively provided at the upper ends of the two pairs of front swing arms, and a front clamping cylinder is provided in the connecting angle plate. The upper end of the cylinder rod of the front clamping cylinder passes through the connecting angle plate and is respectively hinged to the lower ends of the two pairs of front swing arms, so as to control the opening and closing of the two clamping blocks; the output shaft of the adjustment motor is connected to the transmission angle plate through a screw transmission mechanism, so as to realize the axial sliding of the sliding frame along the power shaft, thereby realizing the stretching adjustment of the packaging material.

[0008] Preferably, the sliding frame includes two seat plates, the lower parts of the two seat plates are respectively fixed with sliding sleeves and are respectively installed on two power shafts through the sliding sleeves, a cross beam is connected between the upper ends of the two seat plates by bolts, and the two pairs of front swing arms are symmetrically hinged at both ends of the cross beam by pins.

[0009] Preferably, the front clamping cylinder is located between the two seat plates, and an I-shaped top block is installed on the upper end of the cylinder rod of the front clamping cylinder. Two connecting rods are symmetrically hinged on both sides of the top block and are respectively hinged to the lower ends of the two pairs of front swing arms through the connecting rods to facilitate controlling the swing of the two pairs of front swing arms.

[0010] Preferably, the rear dynamic clamp group includes a fixed frame, which is passed through the two power shafts and locked by screws, and two pairs of rear swing rods are symmetrically hinged on the fixed frame, and corresponding rear clamping blocks are respectively provided at the upper ends of the two pairs of rear swing rods, and a rear clamping cylinder is vertically installed at the lower part of the fixed frame through a seat plate, and the upper ends of the cylinder rods of the rear clamping cylinders are respectively hinged to the lower ends of the two pairs of rear swing rods for controlling the opening and closing of the two rear clamping blocks.

[0011] Preferably, the dynamic clamping group drive device includes a single-axis slide driven by a servo motor, an L-shaped connecting plate is fixed on the single-axis slide, the connecting plate is sleeved on two power shafts and is respectively connected to the power shafts through a set of limit sleeves fixed by top screws.

[0012] The present invention relates to a method for adjusting a step adjustment structure of a printing thermoforming material alignment and forming device, comprising the following steps:

[0013] 1. First, set the actual step size to be consistent with the design step size of the molding die to meet the needs of normal operation of the equipment;

[0014] 2. Set the stretching adjustment amount F and the follow-up adjustment amount t of the packaging material during each stepping process through the human-machine interface of the control unit, where F≥the overhang stretching amount generated when the packaging material is heated, and the follow-up adjustment amount t≤the maximum allowable deviation between the position of the packaging material forming bubble and the printed pattern on the packaging material; it is used to adjust and increase the spacing between the front dynamic clamp group and the rear dynamic clamp group before the end of each stepping process of the packaging material, and stretch and adjust the packaging material;

[0015] 3. Start the equipment, detect the position of the marks on the packaging material through the mark detection device installed on the machine body, and transmit the detection results to the control unit;

[0016] 3.1. If the punctuation point position is not detected, it means that the printed pattern on the packaging material deviates from the position of the formed bubble nest; then during the stepping process of the packaging material, the control unit sends an adjustment signal and starts the adjustment motor, and the adjustment motor drives the sliding frame of the front moving clamp group to move left along the two power shafts through the screw transmission mechanism, and the movement amount S=F+t; by moving the front moving clamp group to the left relative to the rear moving clamp group by a distance F, the front and rear moving clamp groups can stretch the packaging material between them, which is used to solve the overhang deformation caused by the heating of the packaging material; by moving the front moving clamp group by a distance t, the punctuation point position on the packaging material corresponds to the punctuation point detection device, so that the printed pattern on the packaging material corresponds to the position of the formed bubble nest one by one;

[0017] 3.2. If the punctuation position is detected, it means that the printed pattern on the packaging material has not deviated from the forming position; during the stepping process of the packaging material, the control unit sends an adjustment signal and starts the adjustment motor, and the adjustment motor drives the sliding frame of the front moving clamp group to move left along the two power shafts through the screw transmission mechanism, and the movement amount S=F; the front moving clamp group only moves to the left by a distance F relative to the rear moving clamp group, so that the front and rear moving clamp groups stretch the packaging material between them, which is used to solve the overhang deformation caused by the heating of the packaging material; the punctuation position on the packaging material continues to be detected for the next cycle through the cursor detection device;

[0018] 4. After each adjustment, when the front and rear movable clamp groups return to the initial position to the left, the control unit sends a reset signal and drives the sliding frame of the front movable clamp group to return to the initial position through the adjustment motor.

[0019] Preferably, when setting the stretch adjustment amount F, it is necessary to ensure that the step distance of the front movable clamp group after adjustment is greater than the corresponding mark distance on the packaging material, so that the mark located at the mark detection device gradually moves to the right during continuous operation.

[0020] The beneficial effects of the present invention are:

[0021] 1. Since the adjustment structure has an adjustment motor fixed between the two power shafts on the two fixed blocks of the front moving clamp group, the output shaft of the adjustment motor is connected to the transmission angle plate through a screw transmission mechanism, and the transmission angle plate is driven to move linearly by the adjustment motor and the screw transmission mechanism, the sliding frame can slide axially along the power shaft, thereby increasing the relative distance between the front moving clamp group and the rear moving clamp group during the stepping process, thereby achieving stretching adjustment of the packaging material, solving the problem of draping deformation of the packaging material caused by external factors and its own factors in the heating zone, making the position of the formed bubble of the packaging material correspond to the printed pattern one by one, and improving the aesthetics of the final packaging product; reliable operation, convenient adjustment, small plate deviation, high production efficiency; reducing packaging material loss and reducing production costs.

[0022] 2. The adjustment method sets the stretching adjustment amount F and the mark adjustment amount t during each stepping process of the packaging material, wherein F≥the overhang stretching amount generated when the packaging material is heated, and the mark adjustment amount t≤the maximum deviation allowed between the position of the bubble formed by the packaging material and the printed pattern on the packaging material; when the mark detection device detects the mark position on the packaging material, the adjustment motor drives the sliding frame of the front moving clamp group to move left along the two power shafts through the screw transmission mechanism, and the movement amount S=F, which can solve the overhang deformation problem generated by the packaging material during the heating and forming process, so that the formed packaging material remains in a straight state;

[0023] When the punctuation detection device fails to detect the punctuation position on the packaging material, the adjustment motor drives the front moving clamp group to move left along the two power shafts through the screw transmission mechanism, and the movement amount S=F+t. The punctuation position on the packaging material is moved a distance t toward the punctuation detection device through the set tracking adjustment amount t, so that the punctuation position on the packaging material corresponds to the punctuation detection device, which can solve the problem of deviation between the printed pattern on the packaging material and the formed bubble position, and effectively solves the problem of plate alignment and tracking in the printing material molding process, so that the printed pattern on the packaging material and the formed bubble position correspond one by one with respect to the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the installation structure of the present invention.

[0025] Figure 2 yes Figure 1 Top view of the .

[0026] Figure 3 yes Figure 1 Three-dimensional structure diagram.

[0027] Figure 4 yes Figure 1 Left view of the center front moving clamp assembly.

[0028] Figure 5 It is a three-dimensional structural diagram of the front moving clamp group.

[0029] Figure 6 yes Figure 3 A partial enlarged view of the middle and rear dynamic clamp group.

[0030] In the figure: body 1, servo motor 2, connecting plate 3, single-axis slide 4, guide seat 5, power shaft 6, front moving clamp group 7, front fixed clamp device 8, heating device 9, preforming device 10, forming device 11, rear fixed clamp device 12, rear moving clamp group 13, supporting guide rail 14, fixing block 15, transmission angle plate 16, sliding frame 17, front swing arm 18, clamping block 19, top block 20, connecting rod 21, front clamping cylinder 22, screw transmission mechanism 23, adjustment motor 24, sliding sleeve 25, seat plate 26, cross beam 27, rear clamping cylinder 28, seat plate 29, rear clamping block 30, rear swing arm 31, fixing frame 32. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figure 1-Figure 6 As shown, the present invention relates to a step adjustment structure of a printing thermoforming material alignment and forming device, including a dynamic clamping group driving device arranged on a machine body 1, on which two parallel power shafts 6 are slidably installed in a horizontal direction through two guide seats 5, and linear bearings are respectively installed in the two guide seats 5 and between the power shafts 6, and the dynamic clamping group driving device is transmission-connected with the two power shafts 6 to drive the two power shafts 6 to reciprocate horizontally along their axial directions; the two power shafts 6 are provided with a front dynamic clamping group 7 and a rear dynamic clamping group 13 arranged on the left and right, and the rear dynamic clamping group 13 is fixedly clamped on the two power shafts 6 to clamp the packaging material to realize the feeding of the packaging material.

[0034] The dynamic clamping group driving device includes a single-axis slide 4 driven by a servo motor 2, and an L-shaped connecting plate 3 is fixed on the single-axis slide 4. The upper end of the connecting plate 3 is sleeved on two power shafts 6 and is respectively connected to the power shafts 6 through a group of limit sleeves fixed by top screws.

[0035] The front dynamic clamp group 7 includes two fixed blocks 15 and a sliding frame 17. The two fixed blocks 15 are respectively mounted and symmetrically clamped on the two power shafts 6 by screws. An adjustment motor 24 is fixed between the two power shafts 6 on the two fixed blocks 15 by screws. The sliding frame 17 is mounted on the two power shafts 6 by sliding clearance and is connected to a transmission angle plate 16 by screws. Two pairs of front swing arms 18 are symmetrically hinged on the sliding frame 17. Mutually corresponding T-shaped clamping blocks 19 are fixed to the upper ends of the two pairs of front swing arms 18 by bolts for clamping the packaging materials for feeding. A front clamping cylinder 22 is vertically installed in the connecting angle plate by screws, and the upper end of the cylinder rod of the front clamping cylinder 22 passes through the horizontal plane of the connecting angle plate and is respectively hinged to the lower ends of the two pairs of front swing rods 18, so as to control the opening and closing of the two clamping blocks 19; the horizontal plane of the transmission angle plate 16 is inserted into and connected to the sliding frame 17, and the output shaft of the adjustment motor 24 is connected to the transmission angle plate 16 by a screw transmission mechanism 23, so as to realize the axial sliding of the sliding frame 17 along the power shaft 6, thereby realizing the stretching adjustment of the packaging material.

[0036] The adjustment motor 24 is a servo motor, whose output shaft is connected to the screw of the screw transmission mechanism 23 through a coupling. The nut of the screw transmission mechanism 23 is fixed to the vertical surface of the transmission angle plate 16 by screws to control the rotation angle of the adjustment motor 24, thereby controlling the stretching adjustment amount of the packaging material.

[0037] The sliding frame 17 includes two L-shaped seat plates 26, the lower parts of which are respectively fixed with sliding sleeves 25 and are respectively mounted on two power shafts 6 through the sliding sleeves. A crossbeam 27 is connected between the upper ends of the two seat plates by bolts, and the two pairs of front swing arms 18 are symmetrically hinged at both ends of the crossbeam through pins.

[0038] The front clamping cylinder 22 is located between the two seat plates, and an I-shaped top block 20 is fixed to the upper end of the cylinder rod of the front clamping cylinder 22. Two connecting rods 21 are symmetrically hinged on both sides of the top block 20 and are respectively hinged to the lower ends of the two pairs of front swing arms 18 through the connecting rods to control the swing of the two pairs of front swing arms 18.

[0039] The rear dynamic clamping group 13 includes a fixing frame 32, which is inserted into the two power shafts 6 and locked by screws. Two pairs of rear swing rods 31 are symmetrically hinged on the fixing frame, and the upper ends of the two pairs of rear swing rods are respectively provided with corresponding rear clamping blocks 30 for clamping the packaging material to achieve feeding. A seat plate 29 is fixed to the lower part of the fixing frame 32 by screws, and a rear clamping cylinder 28 is vertically installed through the seat plate. The upper end of the cylinder rod of the rear clamping cylinder 28 is respectively hinged to the lower end of the two pairs of rear swing rods 31 through a top block and a connecting rod symmetrically hinged on both sides of the top block, which is used to control the opening and closing of the two rear clamping blocks.

[0040] During installation, the step adjustment structure is installed on one side of the machine body 1 and is located below the heating device 9, preforming device 10, forming device 11 and rear clamping device 12 provided on the machine body 1. Two support rails 14 are installed on the machine body 1. The heating device, preforming device, forming device and rear clamping device are sequentially installed on the two support rails 14. A front clamping device 8 is also fixedly installed on the heating device at the side of the packaging material inlet. The front moving clamp group 7 and the rear moving clamp group 13 are respectively located at the front and rear sides of the front clamping device and the rear clamping device. The stepping of the packaging material is achieved through the cooperation of the front and rear moving clamp groups with the front and rear clamping devices.

[0041] The present invention relates to a method for adjusting a step adjustment structure of a printing thermoforming material alignment and forming device, comprising the following steps:

[0042] 1. First, set the actual step size, i.e., the step distance of the rear movable clamp group 13, to be consistent with the designed step size of the forming mold to meet the normal operation requirements of the equipment;

[0043] 2. The basic adjustment amount F and the follow-up adjustment amount t of each stepping process of the packaging material are set through the human-machine interface of the control unit, wherein the basic adjustment amount F ≥ the overhang stretching amount generated when the packaging material is heated. When setting the stretching adjustment amount F, it is necessary to ensure that the stepping distance after adjustment of the front moving clamp group 7 is greater than the corresponding punctuation distance on the packaging material, so that the punctuation points running to the punctuation detection device gradually move to the right during continuous operation; the follow-up adjustment amount t ≤ the maximum deviation allowed between the position of the packaging material forming bubble nest and the printed pattern on the packaging material; it is used to adjust and increase the spacing between the front moving clamp group 7 and the rear moving clamp group 13 before the end of each stepping process of the packaging material to stretch the packaging material, so as to solve the overhang problem caused by heating in the heating device when the packaging material is running horizontally and the error problem of packaging material printing;

[0044] 3. Start the equipment, drive the front and rear moving clamping groups to reciprocate through the dynamic clamping group driving device via the power shaft 6, and realize the stepping of the packaging material through the cooperation of the front and rear fixed clamping devices; detect the position of the markings on the packaging material through the marking detection device (such as a color mark sensor) set on the machine body 1, and transmit the detection results to the control unit; the control unit is a programmable controller controlled by a human-machine interface;

[0045] 3.1. If the position of the punctuation mark is not detected, it means that the printed pattern on the packaging material deviates from the position of the formed bubble nest; then during the stepping process of the packaging material, the control unit sends an adjustment signal and starts the adjustment motor 24, and the adjustment motor 24 drives the sliding frame 17 of the front moving clamp group 7 to move left along the two power shafts 6 through the screw transmission mechanism 23, and the movement amount S=F+t; by moving the front moving clamp group 7 to the left relative to the rear moving clamp group 13 by a distance F, the front and rear moving clamp groups can stretch the packaging material between them, which is used to solve the overhang deformation caused by the heating of the packaging material; by moving the front moving clamp group 7 by a distance t, the punctuation mark position on the packaging material can correspond to the punctuation mark detection device, so that the printed pattern on the packaging material corresponds to the position of the formed bubble nest one by one;

[0046] 3.2. If the punctuation position is detected, it means that the printed pattern on the packaging material has not deviated from the position of the formed bubble nest; during the stepping process of the packaging material, the control unit sends an adjustment signal and starts the adjustment motor 24, and the adjustment motor 24 drives the sliding frame 17 of the front moving clamp group 7 to move left along the two power shafts 6 through the screw transmission mechanism, and the movement amount S=F; the front moving clamp group 7 moves only a distance F to the left relative to the rear moving clamp group 13, so that the front and rear moving clamp groups stretch the packaging material between them, which is used to solve the overhang deformation caused by the heating of the packaging material; the punctuation position on the packaging material continues to be detected for the next cycle through the cursor detection device;

[0047] 4. After each adjustment, when the front and rear movable clamp groups return to the initial position to the left, the control unit sends a reset signal and drives the sliding frame 17 of the front movable clamp group 7 to return to the initial position through the adjustment motor 24.

[0048] Example 2

[0049] The present invention relates to a method for adjusting a step adjustment structure of a printing thermoforming material alignment and forming device, comprising the following steps:

[0050] 1. First, set the actual step size, i.e., the step distance of the rear movable clamp group 13, to be consistent with the design step size of the forming mold to meet the normal operation requirements of the equipment; in this embodiment, the design step size of the forming mold is 300mm as an example, so the actual step size is set to 300mm;

[0051] 2. The distance between the punctuation marks printed on the packaging material is 297 mm, so the basic adjustment amount F = 2.5 mm can be set on the human-machine interface during each step of the packaging material; due to the influence of the packaging material production process and the final result of material printing, the original industry standard stipulates that the allowable deviation of packaging printing is ±1 mm, so the parameter t is set to be less than 2 mm. In this embodiment, the parameter t is first set to 1.5 mm;

[0052] 3. Adjust the punctuation detection position and the position of the formed bubble nest so that the formed bubble nest is aligned with the printed pattern, and the distance between the detection point position of the punctuation detection device and the left edge of the detection punctuation on the packaging material is less than or equal to 1mm;

[0053] 4. Start the equipment, drive the front and rear moving clamping groups to reciprocate through the dynamic clamping group driving device via the power shaft 6, and realize the stepping of the packaging material through the cooperation of the front and rear fixed clamping devices; at the same time, when the packaging material is stationary, the mark position on the packaging material is detected by the mark detection device (such as a color mark sensor) arranged on the machine body 1, and the detection result is whether it is present or not, and the detection result is transmitted to the control unit; the control unit is a programmable controller controlled by a human-machine interface;

[0054] 4.1. If the punctuation position is detected, it means that the printed pattern on the packaging material has not deviated from the position of the formed bubble; during the stepping process of the packaging material, the control unit sends an adjustment signal and starts the adjustment motor 24, and the adjustment motor 24 drives the sliding frame 17 of the front moving clamp group 7 to move left along the two power shafts 6 through the screw transmission mechanism, and the movement amount S=F=2.5mm; the front moving clamp group 7 only moves to the left by a distance F=2.5mm relative to the rear moving clamp group 13, so that the front and rear moving clamp groups stretch the packaging material between them, which is used to solve the overhang deformation caused by the heating of the packaging material; in this cycle, the packaging material actually moves to the right by L=300-2.5=297.5mm, and the actual spacing between the punctuation points is 297mm, so the punctuation points at the detection position move 0.5mm to the right, that is, the punctuation points move to the right by 0.5mm per cycle. The cursor detection device continues to detect the punctuation position on the packaging material for the next cycle;

[0055] 4.2. If the punctuation point position is not detected, it means that the printed pattern on the packaging material deviates from the position of the formed bubble nest; during the stepping process of the packaging material, the control unit sends an adjustment signal and starts the adjustment motor 24, and the adjustment motor 24 drives the sliding frame 17 of the front moving clamp group 7 to move left along the two power shafts 6 through the screw transmission mechanism 23, and the movement amount S=F+t=2.5mm+1.5mm=4mm; so that the packaging material actually moves to the right in this cycle L=300-2.5-1.5=296mm, and the actual spacing of the punctuation points is 297mm, so the punctuation point at the detection position moves 1mm to the left, that is, the punctuation point moves 1mm to the right every cycle, so that the punctuation point returns to the detection position. By moving the front movable clamp group 7 to the left relative to the rear movable clamp group 13 by a distance F=2.5mm, the front and rear movable clamp groups can stretch the packaging material between them, so as to solve the overhang deformation caused by the packaging material when heated; by moving the front movable clamp group 7 by a distance t=1.5mm, the punctuation position on the packaging material can correspond to the punctuation detection device, so that the printed pattern on the packaging material corresponds to the position of the formed bubble nest one by one;

[0056] 5. After each adjustment, when the front and rear movable clamp groups return to the initial position to the left, the control unit sends a reset signal and drives the sliding frame 17 of the front movable clamp group 7 to return to the initial position through the adjustment motor 24.

[0057] 6. At the same time, refer to the adjustment status of the equipment during operation and adjust the values ​​of F and t appropriately to reduce the limit deviation between the pattern and the bubble, making the packaged product more beautiful.

[0058] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. An adjustment method for a step adjustment structure of a printing thermoforming material alignment forming device, the adjustment structure comprising a dynamic clamping group driving device arranged on a machine body, two mutually parallel power shafts are slidably mounted on the machine body through two guide seats, the dynamic clamping group driving device is transmission-connected with the two power shafts, and is used to drive the two power shafts to reciprocate horizontally along their axial directions; the special feature is that: a front dynamic clamping group and a rear dynamic clamping group arranged on the left and right are arranged on the two power shafts, and the rear dynamic clamping group is fixed on the two power shafts, and is used to clamp the packaging material to realize the feeding of the packaging material; The front dynamic clamping group includes two fixed blocks and a sliding frame, the two fixed blocks are symmetrically clamped on the two power shafts, and an adjustment motor is fixed on the two fixed blocks between the two power shafts. The sliding frame is mounted on the two power shafts and is connected with a transmission angle plate. Two pairs of front swing bars are symmetrically hinged on the sliding frame, and clamping blocks corresponding to each other are respectively provided at the upper ends of the two pairs of front swing bars. A front clamping cylinder is provided in the connecting angle plate, and the upper ends of the cylinder rods of the front clamping cylinders pass through the connecting angle plate and are respectively hinged to the lower ends of the two pairs of front swing bars, so as to control the opening and closing of the two clamping blocks; the output shaft of the adjustment motor is connected to the transmission angle plate through a screw transmission mechanism, so as to realize the axial sliding of the sliding frame along the power shaft, thereby realizing the stretching adjustment of the packaging material; The rear dynamic clamp group includes a fixing frame, which is passed through the two power shafts and locked by screws, and two pairs of rear swing rods are symmetrically hinged on the fixing frame, and the upper ends of the two pairs of rear swing rods are respectively provided with mutually corresponding rear clamping blocks, and a rear clamping cylinder is vertically installed in the lower part of the fixing frame through a seat plate, and the upper ends of the cylinder rods of the rear clamping cylinders are respectively hinged with the lower ends of the two pairs of rear swing rods, so as to control the opening and closing of the two rear clamping blocks; It is characterized in that The adjustment method comprises the following steps: (1) First, set the actual step size to be consistent with the design step size of the molding die to meet the needs of normal operation of the equipment; (2) The stretching adjustment amount F and the follow-up adjustment amount t of the packaging material during each stepping process are set through the human-machine interface of the control unit, where F ≥ the overhang stretching amount generated when the packaging material is heated, and the follow-up adjustment amount t ≤ the maximum allowable deviation between the position of the packaging material forming bubble and the printed pattern on the packaging material; it is used to adjust and increase the spacing between the front dynamic clamp group and the rear dynamic clamp group before the end of each stepping process of the packaging material, and stretch the packaging material; (3) Start the equipment, detect the position of the marks on the packaging material through the mark detection device installed on the machine body, and transmit the detection result to the control unit; (3.1) If the punctuation point position is not detected, it means that the printed pattern on the packaging material deviates from the position of the formed bubble; then during the stepping process of the packaging material, the control unit sends an adjustment signal and starts the adjustment motor, and the adjustment motor drives the sliding frame of the front moving clamp group to move left along the two power shafts through the screw transmission mechanism, and the movement amount S = F + t; by moving the front moving clamp group to the left relative to the rear moving clamp group by a distance F, the front and rear moving clamp groups can stretch the packaging material between them, which is used to solve the overhang deformation caused by the heating of the packaging material; by moving the front moving clamp group by a distance t, the punctuation point position on the packaging material corresponds to the punctuation point detection device, so that the printed pattern on the packaging material corresponds to the position of the formed bubble one by one; (3.2) If the punctuation position is detected, it means that the printed pattern on the packaging material has not deviated from the forming position; during the stepping process of the packaging material, the control unit sends an adjustment signal and starts the adjustment motor, and the adjustment motor drives the sliding frame of the front moving clamp group to move left along the two power shafts through the screw transmission mechanism, and the movement amount S=F; the front moving clamp group only moves to the left by a distance F relative to the rear moving clamp group, so that the front and rear moving clamp groups stretch the packaging material between them, which is used to solve the overhang deformation caused by the heating of the packaging material; the punctuation position on the packaging material continues to be detected for the next cycle through the cursor detection device; (4) After each adjustment, when the front and rear movable clamp groups return to the initial position to the left, the control unit sends a reset signal and drives the sliding frame of the front movable clamp group to return to the initial position through the adjustment motor.

2. The method for adjusting the step adjustment structure of the printing thermoforming material alignment and forming device according to claim 1, characterized in that: The sliding frame includes two seat plates, the lower parts of the two seat plates are respectively fixed with sliding sleeves and are respectively installed on two power shafts through the sliding sleeves, a crossbeam is connected between the upper ends of the two seat plates by bolts, and the two pairs of front swing arms are symmetrically hinged at both ends of the crossbeam through pin shafts.

3. The method for adjusting the step adjustment structure of the printing thermoforming material alignment and forming device according to claim 1, characterized in that: The front clamping cylinder is located between the two seat plates, and an I-shaped top block is installed on the upper end of the cylinder rod of the front clamping cylinder. Two connecting rods are symmetrically hinged on both sides of the top block and are respectively hinged to the lower ends of the two pairs of front swing arms through the connecting rods to control the swing of the two pairs of front swing arms.

4. The method for adjusting the step adjustment structure of the printing thermoforming material alignment and forming device according to claim 1, characterized in that: The dynamic clamping group driving device includes a single-axis slide driven by a servo motor, an L-shaped connecting plate is fixed on the single-axis slide, the connecting plate is sleeved on two power shafts and is respectively connected to the power shafts through a set of limit sleeves fixed by top screws.

5. The method for adjusting the step adjustment structure of the printing thermoforming material alignment and forming device according to claim 1, characterized in that: When setting the stretching adjustment amount F, ensure that the step distance of the front movable clamp group after adjustment is greater than the corresponding mark distance on the packaging material, so that the mark located at the mark detection device gradually moves to the right during continuous operation.

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