Heat sealing assembly on food packaging machine

Abstract

The utility model discloses a heat sealing assembly for a food packaging machine. The heat sealing assembly is used for conducting heat sealing on bubble cap bottom boxes passing through a matrix arrangement lattice bin on a feeding plate and bubble cap sealing covers covering the bubble cap bottom boxes. The assembly comprises a mounting bracket, a lifting cylinder, a lifting plate connected with a piston rod of the cylinder, a guide rod fixed on the lifting plate, a guide sleeve arranged on the mounting bracket, and a plurality of heat sealing modules which are arranged on the lifting plate and are in one-to-one correspondence with the lattice bins. Each heat sealing module comprises a heat insulation base plate, a uniform-temperature heating plate and a heat sealing pressing head, independent controllable heating unit arrays and micro heating elements are arranged in the uniform-temperature heating plates, compression springs are arranged between the heat sealing modules and the lifting plate, and buffering pressing rods are arranged on the two sides of the lifting plate. The heat sealing device can effectively buffer impact, adaptively compensate the depth difference of the grid bin or the thickness difference of the bubble cap, realize uniform heat sealing pressure, improve the sealing quality and the equipment safety, and is simple in structure, convenient to maintain and high in adaptability.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and in particular to a heat-sealing assembly for heat-sealing blister packs and blister caps within a compartment in the food, pharmaceutical and other fields. Background Technology

[0002] In automated blister packaging production lines, a feeding plate is often used to carry multiple matrix-arranged compartments. Each compartment contains a blister base box and is covered with a blister cap. Then, a heat sealing device seals the blister base box and the blister cap. This feeding plate moves intermittently.

[0003] In the existing technology, the heat sealing device for this type of feeding plate blister pack has the following problems:

[0004] 1. Impact damage risk: When the heat-sealing component is pressed down, if it directly and rigidly contacts the feed plate or blister, it is easy to generate a large impact force, which may cause blister breakage, bottom box deformation or feed plate damage.

[0005] 2. Insufficient pressure control precision: There may be slight differences in the depth of different compartments, or the thickness of the blister pack / cap may be uneven. Traditional integral pressure plates are difficult to adaptively compensate for this, which may result in insufficient pressure in some compartments (insecure sealing) or excessive pressure (damaging the blister pack).

[0006] 3. Simple or imperfect buffering mechanism: Although some devices have a buffering design, the buffering stroke may be fixed, the buffering force may not be adjustable, or the buffering effect may be poor, and it may not be able to effectively absorb the impact caused by the positioning error when the feeding plate is in place.

[0007] 4. Poor independence of heat sealing modules: Traditional heat sealing devices are mostly integral heat sealing plates. If a problem occurs in a certain cell or needs to be adjusted, the entire heat sealing plate may need to be stopped for treatment, which affects efficiency.

[0008] 5. Lack of graded buffering: In high-speed production, the kinetic energy of the feed plate when it moves into place is relatively large, and a single end buffer may not be enough to completely eliminate the impact.

[0009] Therefore, there is a need for a heat-sealing component that can flexibly, precisely, and efficiently heat-seal blister packs in the feed hopper, and effectively buffer impacts and protect equipment and products. Utility Model Content

[0010] To address the aforementioned problems, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a heat-sealing assembly for blister packaging in a feed plate compartment. This assembly can achieve flexible contact with the feed plate, effectively buffer impacts, and perform uniform and pressure-adjustable heat sealing of the blister bottom box and blister cap inside the compartment. It also has the advantages of simple structure, convenient maintenance, and strong adaptability.

[0011] To achieve the above objectives, this utility model provides the following technical solution: a heat-sealing assembly for blister packaging in a feed plate grid, used for a feed plate, the feed plate being provided with grids arranged in a matrix and forming grooves, wherein the blister bottom box inside the grid and the blister cap covering it are heat-sealed; characterized in that it includes:

[0012] Mounting bracket;

[0013] A lifting cylinder is mounted on the mounting bracket;

[0014] The lifting plate is connected to the piston rod of the lifting cylinder;

[0015] At least two guide rods are vertically fixed to the lifting plate;

[0016] At least two guide sleeves are correspondingly disposed on the mounting bracket, and the guide rod passes through the guide sleeves;

[0017] Multiple heat-sealing modules are mounted on the lifting plate and correspond one-to-one with the compartments. Each heat-sealing module includes a heat-insulating substrate, a uniform-temperature heating plate, and a heat-sealing head. The uniform-temperature heating plate is mounted on the heat-insulating substrate and has at least one set of independently controllable heating unit arrays inside. Each heating unit array contains multiple micro heating elements arranged in an array. The heat-sealing head is detachably connected to the end face of the uniform-temperature heating plate facing the compartment. The surface of the head facing the compartment is the heat-sealing working surface, and the heat-sealing working surface is connected to the uniform-temperature heating plate through a heat-conducting connector.

[0018] The heat insulation substrate is fixedly connected to the lower end of four symmetrically arranged guide pillars, the upper ends of the four guide pillars pass through the lifting plate, and a first limiting nut is arranged on the guide pillar section above the lifting plate.

[0019] A compression spring is provided between the heat sealing module and the lifting plate, located between the heat insulation substrate and the lifting plate.

[0020] Furthermore, the micro heating elements in the uniform heating plate are micro PTC heating elements or micro resistance wires, and each micro heating element is connected in parallel or in series in groups to an independent temperature control circuit.

[0021] Furthermore, at least one buffer rod is provided on each side of the lifting plate. The upper end of the buffer rod passes through the lifting plate, and a second limiting nut is provided on the buffer rod section above the lifting plate. A rubber buffer block is fixed to the lower end of the buffer rod. A buffer spring is provided between the rubber buffer block and the lifting plate. The buffer spring is sleeved on the buffer rod and located between the lifting plate and the rubber buffer block. When the lifting plate moves down, the rubber buffer block contacts the feeding plate before the heat sealing working surface of the heat sealing module.

[0022] Furthermore, the heat insulation substrate is made of a low thermal conductivity material and has a hollow heat insulation cavity inside or is filled with heat insulation material.

[0023] Furthermore, the shape of the heat-sealing working surface of the heat-sealing head matches the shape of the sealing area of ​​the blister pack bottom box in the corresponding compartment, and the edges are chamfered or rounded.

[0024] Furthermore, the heat-sealing head is provided with an independent cooling channel, which is connected to an external cooling medium source.

[0025] Furthermore, the elastic coefficients of both the compression spring and the buffer spring are adjustable or can be replaced.

[0026] Furthermore, the heat-sealing working surface of the heat-sealing head is made of cemented carbide.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] 1. Dual buffer protection, minimal impact: The system incorporates a primary buffer consisting of rubber buffer blocks and buffer springs, and a secondary buffer consisting of compression springs between the heat-sealing module and the lifting plate. As the lifting plate descends, the rubber buffer blocks first contact the feeding plate, absorbing most of the impact kinetic energy and achieving flexible contact and initial positioning. Subsequently, the heat-sealing module continues to descend under the action of the compression springs, applying pressure to heat-seal the blister packs. The compression springs further buffer and adaptively compensate for minor differences in compartment depth or blister pack thickness, effectively preventing blister pack damage and bottom box deformation, protecting both the equipment and the product.

[0029] 2. Precise and adaptive pressure control: Each heat-sealing module provides elastic pressure through a compression spring. When there are depth tolerances or uneven blister thicknesses in different compartments, the compression spring can be compressed to different degrees, so that the heat-sealing working surfaces of each heat-sealing module can press the blister with relatively uniform pressure. This avoids pressure loss caused by excessive local pressure or weak sealing caused by insufficient local pressure, thus improving the stability and consistency of sealing quality.

[0030] 3. Independent elastic floating of heat sealing modules with strong adaptability: Each heat sealing module achieves independent elastic floating relative to the lifting plate through four guide pillars and compression springs, which not only enhances the buffering effect, but also makes the maintenance and replacement of individual heat sealing modules more convenient without affecting the operation of other heat sealing modules.

[0031] 4. Good temperature uniformity and high sealing quality: Each heat sealing module has multiple sets of independently controllable micro heating element arrays in its uniform heating plate, which can realize precise zone control and overall uniformity of the heating plate surface temperature, ensuring that the sealing strength of each blister is consistent.

[0032] 5. Novel and compact structure, accurate positioning: The rubber buffer block at the end of the buffer pressure bar contacts the feeding plate before the heat sealing head, which can play a role in pre-alignment and precise positioning, ensuring that the heat sealing head is accurately aligned with the blister pack in the compartment.

[0033] 6. Fast cooling speed and high efficiency: The heat sealing head has a built-in cooling channel, which, together with the external cooling system, can achieve rapid cooling, shorten the heat sealing cycle, and improve packaging efficiency.

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0035] Figure 1 This is a structural diagram of a specific embodiment of the present utility model;

[0036] Figure 2 This is a structural diagram of the heat-sealing module in a specific embodiment of this utility model.

[0037] Explanation of reference numerals in the attached drawings: 1-Mounting bracket, 2-Lifting cylinder, 3-Lifting plate, 4-Guide rod, 5-Guide sleeve, 6-Heat sealing module, 7-Feeding plate, 8-Compartment, 9-Blister base box, 10-Blister cover, 61-Insulation substrate, 62-Equalizing heating plate, 621-Miniature PTC heating element, 622-Heating unit array, 63-Heat-conducting connector, 64-Heat sealing head, 641-Heat sealing working surface, 642-Cooling channel; 65-Guide post, 651-First limit nut, 66-Compression spring; 67-Buffer rod, 671-Second limit nut, 68-Rubber buffer block, 69-Buffer spring. Detailed Implementation

[0038] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0039] like Figure 1 , Figure 2As shown, this embodiment discloses a heat-sealing assembly for blister packaging in a feed tray, including a mounting bracket 1, two lifting cylinders 2, a lifting plate 3, four guide rods 4 vertically fixed to the lifting plate 3, and four guide sleeves 5 correspondingly disposed on the mounting bracket 1. The two lifting cylinders 2 are symmetrically disposed on the upper part of the mounting bracket 1, with their cylinder bodies fixed to the mounting bracket 1. Their piston rods are vertically downward and fixedly connected to the center area of ​​the upper surface of the lifting plate 3, driving the lifting plate 3 to rise and fall vertically along the guide rods 4 and guide sleeves 5.

[0040] On the lower surface of the lifting plate 3, multiple heat sealing modules 6 are evenly arranged in the row and column layout of the upper compartment 8 of the feeding plate 7.

[0041] The detailed structure of each heat-sealed module 6 is as follows: Figure 2 As shown, the system includes a heat-insulating substrate 61, a uniform heating plate 62, and a heat-sealing head 64. The lower surface of the heat-insulating substrate 61 is used to mount the uniform heating plate 62 and the heat-sealing head 64. Crucially, the four corners of the heat-insulating substrate 61 are fixedly connected to the lower ends of four symmetrically arranged guide posts 65 (preferably vertically arranged). The upper ends of these four guide posts 65 pass upward through corresponding guide holes on the lifting plate 3, and a first limiting nut 651 is disposed on the threaded section of the upper end of the guide post 65. By tightening the first limiting nut 651, the maximum upward distance of the heat-insulating substrate 61 (along with the entire heat-sealing module 6) relative to the lifting plate 3 can be limited, while also preventing the heat-sealing module 6 from falling off the guide posts 65. A compression spring 66 is provided between the upper surface of the heat-insulating substrate 61 and the lower surface of the lifting plate 3, with one end abutting against the upper surface of the heat-insulating substrate 61 and the other end abutting against the lower surface of the lifting plate 3. The compression spring 66 provides an upward elastic force, so that in the natural state or in the non-working state, the heat-sealing module 6 is lifted by the compression spring 66 and maintains a certain gap with the lifting plate 3.

[0042] In addition, two buffer rods 67 are provided on each side (e.g., the front and rear sides) of the lifting plate 3 (a total of four rods, but more or fewer can be provided as needed). The upper end of each buffer rod 67 passes through a corresponding through hole on the lifting plate 3, and a second limiting nut 671 is provided on the threaded section of the upper end of the buffer rod 67 to limit the maximum upward distance of the rubber buffer block 68 relative to the lifting plate 3. A rubber buffer block 68 is fixed to the lower end of the buffer rod 67. The rubber buffer block 68 is made of a relatively soft material and has a certain degree of elasticity and shock absorption capacity. Between the upper surface of the rubber buffer block 68 and the lower surface of the lifting plate 3, a buffer spring 69 is sleeved on the buffer rod 67, with one end abutting against the lower surface of the lifting plate 3 and the other end abutting against the upper surface of the rubber buffer block 68. The buffer spring 69 ensures that the rubber buffer block 68 maintains a certain pre-compression or pre-tension state with the lifting plate 3 under normal conditions, ensuring that it can contact the feeding plate 7 in time when the lifting plate 3 moves downward.

[0043] A uniform heating plate 62 is disposed on the lower surface of the heat-insulating substrate 61, and two sets of independently controllable heating unit arrays 622 are embedded therein. Each heating unit array 622 consists of multiple miniature PTC heating elements 621 arranged in a matrix, and each miniature PTC heating element 621 is connected to an independent temperature control circuit. The heat-sealing head 64 is detachably connected to the lower end face of the uniform heating plate 62 via a connecting boss on its top using high-temperature resistant fasteners. A thermally conductive connector 63 made of high thermal conductivity graphite is provided between the heat-sealing head 64 and the uniform heating plate 62. The lower end face of the heat-sealing head 64 is a contoured curved heat-sealing working surface 641 that matches the shape of the sealing area of ​​the blister pack 9 inside the compartment 8, and is made of hard alloy. The heat-sealing head 64 has a serpentine cooling channel 642 inside, which is connected to an external cooling system.

[0044] A pressure sensor is installed between the two lifting cylinders 2 and the lifting plate 3 to monitor the pressure in real time and provide feedback to the control system.

[0045] During operation, a loading plate 7 carrying multiple matrix-arranged compartments 8 is conveyed to the heat-sealing station. Each compartment 8 is already filled with a blister pack 9 and covered with a blister cap 10. The control system starts the heat-sealing program, and two lifting cylinders 2 move synchronously, driving the lifting plate 3 to vertically descend all heat-sealing modules 6 and buffer pressure rods 67.

[0046] First, as the lifting plate 3 descends, the rubber buffer block 68, assisted by the buffer spring 69, contacts the upper surface of the feeding plate 7 before the heat-sealing working surface 641 of the heat-sealing module 6. The softness of the rubber buffer block 68 absorbs most of the kinetic energy of the downward movement of the lifting plate 3, playing a preliminary deceleration and buffering role. At the same time, the contact between the rubber buffer block 68 and the feeding plate 7 also helps the lifting plate 3 to perform final precise positioning, ensuring that the heat-sealing module 6 can be accurately aligned with the compartment 8 below.

[0047] Next, after the rubber buffer block 68 contacts the loading plate 7 and compresses the buffer spring 69, the lifting plate 3 continues to descend slowly under the push of the cylinder. At this time, because the compression spring 66 above the heat sealing module 6's heat insulation substrate 61 is in a compressed state, the heat insulation substrate 61 and the heat sealing head 64 do not immediately descend rapidly in sync with the lifting plate 3, but descend slowly as the compression spring 66 is gradually compressed. When the heat sealing working surface 641 of the heat sealing head 64 contacts the blister cap 10, the continuing downward lifting plate 3 will apply greater pressure to the compression spring 66 through the guide post 65, and the compression spring 66 will be further compressed until the preset heat sealing pressure is reached (this pressure can be determined by the cylinder air pressure and the elastic coefficient of the compression spring, and is monitored by the pressure sensor). During this process, the compression spring 66 effectively buffers the direct impact on the blister and can adapt to the slight depth differences that may exist in different compartments 8 or the uneven thickness of the blister bottom box 9 / cap 10, so that the pressure applied by each heat sealing module 6 tends to be uniform.

[0048] Subsequently, the uniform heating plate 62 is energized and heated. The heat is transferred to the heat-sealing head 64 via the heat-conducting connector 63, causing its heat-sealing working surface 641 to reach the set temperature, thus heat-sealing the blister cap 10 and the base box 9. After heat sealing is completed, the uniform heating plate 62 is de-energized, the cooling system is activated, and the cooling medium flows through the cooling channel 642 to rapidly cool the heat-sealing head 64. Afterward, the lifting cylinder 2 drives the lifting plate 3 to rise and reset, the compression spring 66 returns to its original state, lifting the heat-sealing module 6. The rubber buffer block 68 also rises with the lifting plate 3 and leaves the loading plate 7 under the action of the buffer spring 69. Finally, the loading plate 7, which has completed heat sealing, is conveyed out of the heat sealing station.

[0049] When it is necessary to change blister packs of different specifications or adjust the heat sealing pressure, this can be achieved by replacing the compression spring 66 and / or the buffer spring 69 with different elastic coefficients. Replacing the heat sealing head 64 with one of different shapes and sizes can accommodate blister packs of different shapes.

[0050] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat sealing assembly on a food packaging machine, for passing through a feeding plate (7) provided with a matrix arrangement of recessed cells (8) in which blister bottom boxes (9) and blister covers (10) are heat sealed; characterized in that, The utility model relates to a kind of hot sealing device, including: Mounting bracket (1); Lifting cylinder (2) is set on the mounting bracket (1); Lifting plate (3) is connected with the piston rod of the lifting cylinder (2); At least two guide rods (4) are vertically fixed on the lifting plate (3); At least two guide sleeves (5) are correspondingly arranged on the mounting bracket (1), and the guide rod (4) passes through the guide sleeve (5); A plurality of heat sealing modules (6) are arranged on the lifting plate (3), and correspond to the grid bin (8) one by one;Each of the heat sealing modules (6) includes a heat insulation base plate (61), a uniform temperature heating plate (62) and a heat sealing pressure head (64);The uniform temperature heating plate (62) is arranged on the heat insulation base plate (61), and at least one group of independently controllable heating unit arrays (622) are arranged in the uniform temperature heating plate (62), each heating unit array (622) includes a plurality of arrayed micro-heating elements;The heat sealing pressure head (64) is detachably connected to the end face of the uniform temperature heating plate (62) facing the grid bin (8), and the surface of the heat sealing pressure head (64) facing the grid bin (8) is a heat sealing working surface (641), and the heat sealing working surface (641) and the uniform temperature heating plate (62) are connected by a heat conducting connecting piece (63); The heat insulation base plate (61) is fixedly connected with the lower ends of four symmetrically arranged guide columns (65), and the upper ends of the four guide columns (65) pass through the lifting plate (3) and are provided with first limiting nuts (651) on the guide column (65) segments above the lifting plate (3); A compression spring (66) is arranged between the heat sealing module (6) and the lifting plate (3) and located between the heat insulation base plate (61) and the lifting plate (3).

2. The hot seal assembly on a food packaging machine according to claim 1, characterized in that: The micro-heating elements in the uniform temperature heating plate (62) are micro-PTC heating sheets (621) or micro-resistance wires, and each micro-heating element is connected to an independent temperature control circuit in parallel or in groups in series.

3. The hot seal assembly on a food packaging machine of claim 1, wherein: At least one buffer pressure rod (67) is arranged on both sides of the lifting plate (3), the upper end of the buffer pressure rod (67) passes through the lifting plate (3), and the second limiting nut (671) is arranged on the buffer pressure rod (67) segment above the lifting plate (3);The lower end of the buffer pressure rod (67) is fixedly provided with a rubber buffer block (68), and a buffer spring (69) is arranged between the rubber buffer block (68) and the lifting plate (3), the buffer spring (69) is sleeved on the buffer pressure rod (67) and located between the lifting plate (3) and the rubber buffer block (68);When the lifting plate (3) moves downward, the rubber buffer block (68) contacts the feeding plate (7) before the heat sealing working surface (641) of the heat sealing module (6).

4. The hot seal assembly on a food packaging machine of claim 1, wherein: The heat insulation base plate (61) is made of low thermal conductivity material and has a hollow heat insulation cavity or is filled with heat insulation material.

5. The hot seal assembly on a food packaging machine of claim 1, wherein: The shape of the heat sealing working surface (641) of the heat sealing pressure head (64) matches the shape of the sealing area of the blister bottom box (9) in the corresponding grid bin (8), and the edge is provided with a chamfer or a round corner.

6. The hot seal assembly on a food packaging machine of claim 1, wherein: The heat-sealing head (64) is provided with an independent cooling channel (642) which is connected with an external cooling medium source.

7. The hot seal assembly on a food packaging machine of claim 1, wherein: The elastic coefficient of the compression spring (66) is adjustable or can be replaced.

8. The hot seal assembly on a food packaging machine of claim 1, wherein: The heat-sealing working surface (641) of the heat-sealing head (64) is made of hard alloy.

Images