A cutting mechanism for a desiccant packaging machine

Abstract

The utility model relates to packing equipment technical field, concretely is a kind of shearing mechanism for desiccant packing machine, it includes: rack, knife roll and extruding roller;Rotary unit consisting of heating element and elastic power connection structure is set on knife roll, and first power connection seat and second power connection seat with different power-on mode are correspondingly configured.The utility model, by setting the elastic power connection structure that can rotate with knife roll, cooperate respectively with the first power connection seat and the second power connection seat with periodic power-on function and always power-on function, so that only in actual participation seal cutting work and its adjacent preheating angle's clamp plate is heated, the heating element in most of the rest rotation stroke is in power-off state, fundamentally eliminates the energy waste caused by the continuous work of all heating elements in traditional technology.At the same time, the cooperation design of floating flange and elastic heat insulation pad effectively isolates the influence of tool bit thermal deformation on main shaft rotation accuracy, ensures the long-term stability of seal cutting quality and equipment operation reliability.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, specifically a shearing mechanism for a desiccant packaging machine. Background Technology

[0002] In the field of desiccant packaging equipment, the transverse sealing and cutting mechanism that achieves the final sealing and cutting of the bag is a key functional unit. Currently, the mainstream solutions fall into two technical paths: one is to separate the sealing and cutting actions, with sealing completed by a hot press plate and cutting performed by an independent pneumatic or mechanical horizontal reciprocating cutter; the other is to integrate the heat sealing and cutting functions, using one or two rotating cutter rollers to periodically cut the bag while utilizing the integrated heating function of the cutter rollers to complete the fusion seal of the upper and lower ends of the bag.

[0003] This invention aims to improve upon the latter type of integrated rotary shearing mechanism. In existing technology, to ensure that each shearing unit (or "cutter head") on the cutter roller instantly reaches the heat-sealing temperature when rotating to the working position, a simple control strategy is commonly used: keeping the heating elements on all cutter heads continuously energized and heated throughout the equipment's operation. While this mode ensures immediate sealing reliability, its energy efficiency is low. Taking a common four-cutter rotary cutter roller as an example: for each revolution of the roller, each cutter head is only in the actual pressing and effective heat-sealing state for less than one-eighth of the cycle. Considering the heat dissipation of the cutter head after contact with the environment and the cold bag, a preheating time is required before reaching the working position to ensure sealing quality. Even so, comprehensive calculations show that more than half of the electrical energy is still consumed during the idling period when not directly working, and this energy is ultimately wasted in the form of thermal radiation and convection. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a shearing mechanism for a desiccant packaging machine.

[0005] The technical solution of this utility model is: A shearing mechanism for a desiccant packaging machine, comprising: A frame, with a cutter roller rotatably mounted at one end and an extrusion roller rotatably mounted at the other end via an elastic guide assembly, the extrusion roller being parallel to and abutting against the cutter roller; The cutter roller includes a shearing shaft, on which a plurality of clamping plates are provided via a floating flange, and blades are provided between the clamping plates. Heating elements are axially provided on the clamping plates near the blades, and the heating elements are provided with elastic electrical connection structures at both ends. The first electrical contact is concentrically located at one end of the shearing shaft. When the cutter roller rotates, the first electrical contact is periodically electrically connected to the elastic electrical contact structure. The second electrical contact is concentrically located at the other end of the shearing shaft. When the cutter roller rotates, the second electrical contact is always electrically connected to the elastic electrical contact structure.

[0006] Preferably, the floating flange is axially engaged and axially slidably connected to the shear shaft, and the floating flange is fixedly connected to the shear shaft by fasteners.

[0007] Preferably, the floating flange edge is provided with a fan-shaped locking block, which engages with the end face of the clamping plate to restrict the radial movement of the clamping plate.

[0008] Preferably, an elastic heat insulation pad is provided between the floating flange and the end face of the clamping plate.

[0009] Preferably, the flexible electrical connection assembly includes a connecting piece, which is detachably mounted on the ends of the two heating elements on both sides of the blade. The connecting piece is provided with an electrical contact spring on its outer side, which contacts the first electrical contact base and the second electrical contact base.

[0010] Preferably, the first electrical contact includes a first insulating base, which is fixedly installed inside the frame. The first insulating base has an arc-shaped electrical contact piece on the side facing the heating element, and the central angle of the arc-shaped electrical contact piece is 180 degrees.

[0011] Preferably, the second electrical connector includes a second insulating seat, which is fixedly installed inside the frame, and the second insulating seat has an annular electrical connector on the side facing the heating element.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention, by incorporating a flexible electrical connection structure that rotates with the cutter roller, and in conjunction with a first and second electrical connection base respectively featuring periodic and constant energization functions, ensures that only the clamping plates involved in the actual sealing and cutting process and their adjacent preheating angles are heated. The heating elements remain de-energized for the majority of the rotational stroke, fundamentally eliminating the energy waste caused by the continuous operation of all heating elements in traditional technologies. Simultaneously, the combined design of the floating flange and the elastic heat insulation pad effectively isolates the impact of cutter head thermal deformation on the spindle rotation accuracy, ensuring long-term stability of sealing and cutting quality and reliable equipment operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cutter roller structure in this utility model; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 This is an exploded view of the cutter roller structure in this utility model; Figure 5 This is a schematic diagram of the first electrical connector structure in this utility model; Figure 6 This is a schematic diagram of the second electrical connector structure in this utility model.

[0014] The meanings of the labels in the diagram are as follows: 1. Frame; 2. Elastic guide assembly; 3. Extrusion roller; 4. Shearing shaft; 5. Floating flange; 501. Clamping block; 6. Fastener; 7. Clamping plate; 701. Blade groove; 702. Welding protrusion; 8. Elastic heat insulation pad; 9. Blade; 10. Heating element; 11. Fixing nut; 12. Insulating sheet; 13. Connecting piece; 14. Electrical contact spring; 15. First insulating seat; 16. Arc-shaped electrical contact piece; 17. Second insulating seat; 18. Annular electrical contact piece. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: Please see Figure 1-6 The present invention will describe the above technical solution in detail through the following embodiments: A shearing mechanism for a desiccant packaging machine, comprising: The frame 1 has a cutter roller rotatably mounted on one end and a squeeze roller 3 rotatably mounted on the other end via an elastic guide assembly 2. The squeeze roller 3 is parallel to and abuts against the cutter roller.

[0017] The elastic guide assembly 2 can be a spring-loaded structure with a linear guide known in the art. It provides elastic pressure perpendicular to the direction of material bag travel to the extrusion roller 3 and ensures the parallelism between the extrusion roller 3 and the cutter roller, so that the cylindrical working surfaces of the two can stably abut against each other.

[0018] The cutter roller includes a shearing shaft 4, on which four clamping plates 7 are provided via a floating flange 5. Blades 9 are provided between the clamping plates 7. Heating elements 10 are axially provided on the clamping plates 7 near the blades 9. The heating elements 10 have elastic electrical connection structures at both ends.

[0019] The clamping plate 7 has a blade groove 701 on one side to limit the insertion depth of the blade 9. The blade 9 is fixed to the clamping plate 7 by screws.

[0020] The shearing shaft 4 is rotatably connected to the frame 1 via a bearing housing. It is used to connect to an external drive device, such as a known motor.

[0021] The floating flange 5 is axially engaged and axially slidably connected to the shear shaft 4, and the floating flange 5 is fixedly connected to the shear shaft 4 by fasteners 6.

[0022] A spline can be installed in the middle of the shear shaft 4 to transmit power and restrict the axial movement of the floating flange 5. The spline can be a six-spline.

[0023] Fastener 6 can be a bolt, which, when tightened, is used to restrict the axial movement of the floating flange 5.

[0024] The floating flange 5 has a fan-shaped locking block 501 on its edge, which engages with the end face of the clamping plate 7 to limit the radial movement of the clamping plate 7.

[0025] The clamping block 501 is used to restrict the radial movement of the clamping plate 7 and to transmit the power of the shearing shaft 4 to the clamping plate 7.

[0026] An elastic heat insulation pad 8 is provided between the floating flange 5 and the end face of the clamp 7.

[0027] The elastic heat insulation pad 8 can be made of fluororubber, which allows for slight displacement between the floating flange 5 and the clamping plate 7 to meet the thermal expansion and contraction requirements of the clamping plate 7. It also blocks heat transfer between the floating flange 5 and the clamping plate 7.

[0028] The heating element 10 is slidably connected to the clamping plate 7, and both ends are threaded with fixing nuts 11, which are used to achieve axial locking. An insulating sheet 12 is provided between the fixing nut 11 and the clamping plate 7.

[0029] The heating element 10 is a known resistance heating element, which can be a miniature armored heating rod.

[0030] The flexible electrical connection assembly includes a connecting piece 13, which is detachably mounted on the ends of two heating elements 10 on both sides of the blade 9. An electrical connection spring 14 is welded to the outside of the connecting piece 13, and the electrical connection spring 14 contacts the first electrical connection base and the second electrical connection base.

[0031] The connecting piece 13 is fixedly connected to the ends of both heating elements 10 simultaneously by screws, connecting the two heating elements 10 in parallel. This ensures that the temperature on both sides of the blade 9 is consistent.

[0032] Since there are four clamping plates 7, there are eight heating elements 10, and four connecting pieces 13 and four electrical contact springs 14.

[0033] The clamping plates 7 on both sides of the blade 9 are provided with welding protrusions 702 for squeezing the material bag and ensuring welding quality.

[0034] The first electrical contact is concentrically located at one end of the shearing shaft 4. When the cutter roller rotates, the first electrical contact is periodically electrically connected to the elastic electrical contact structure.

[0035] The first electrical connector includes a first insulating seat 15, which is fixedly installed inside the frame 1. The first insulating seat 15 has an arc-shaped electrical connector 16 on the side facing the heating element 10, and the central angle of the arc-shaped electrical connector 16 is 180 degrees.

[0036] The first terminal block is used to connect to the positive terminal. The arc-shaped terminal piece 16 is preferably connected to DC power, with a preferred voltage of 24V.

[0037] The arc-shaped contact plate 16 is preferably installed directly above the extrusion roller 3, covering a range of 0-180 degrees.

[0038] Since the central angle of the arc-shaped contact plate 16 is 180 degrees, and there are four contact springs 14, at any given moment of rotation, at most two contact springs 14 are connected to the arc-shaped contact plate 16, and correspondingly, at most two clamping plates 7 on both sides of the blade 9 are heated. The other two blades 9 are in a de-energized cooling state.

[0039] The second electrical contact is concentrically located at the other end of the shearing shaft 4. When the cutter roller rotates, the second electrical contact is always electrically connected to the elastic electrical contact structure.

[0040] The second electrical connector includes a second insulating seat 17, which is fixedly installed inside the frame 1. The second insulating seat 17 has an annular electrical connector 18 on the side facing the heating element 10.

[0041] The second terminal is used to connect to the negative terminal to ensure current flow.

[0042] Working principle: The equipment starts up, and the shearing shaft 4 rotates at a constant speed under the drive of the drive unit (not shown in the diagram). All heating elements 10 are initially de-energized.

[0043] Energize the arc-shaped contact piece 16 and the ring-shaped contact piece 18.

[0044] The rotation of the cutter roller causes the contact spring 14 to slide on the arc-shaped contact piece 16 and the annular contact piece 18.

[0045] The current starts from the positive terminal of the power supply, passes through the arc-shaped contact piece 16 and is transmitted to the contact spring 14, flows through the heating element 10, flows from the contact spring 14 at the other end to the ring-shaped contact piece 18, and finally returns to the negative terminal of the power supply.

[0046] Whether the current can form a complete circuit depends on whether the contact spring 14 contacts the arc-shaped contact plate 16. Only when the blade 9 rotates to the point where the contact spring 14 at both ends contacts the 180-degree arc-shaped contact plate 16, can the current flow from the positive terminal of the power supply through the arc-shaped contact plate 16 and the contact spring 14 into the heating element 10, and then flow back to the negative terminal of the power supply, and only then will the heating element 10 start to work.

[0047] Taking a four-head work cycle as an example: Within a 360° rotation cycle, the process involves: the first blade 9 entering the starting point of the 180° arc zone to begin preheating → as it rotates to a vertical position, the second blade 9 behind it enters the starting point of the 180° arc zone to begin preheating → the first blade 9 reaches the working position where it contacts the extrusion roller 3, at which point the second blade 9 is in a vertical position → the first blade 9 leaves the end point of the 180° arc zone and stops heating, while the third blade 9 enters the starting point of the 180° arc zone → the first blade 9 idles and cools in the remaining 180° range. The four blades work in sequence to achieve continuous production.

[0048] Thermal deformation management: During operation, the heated clamping plate 7 and blade 9 will undergo thermal expansion. The elastic heat insulation pad 8 can absorb this slight deformation, preventing thermal stress and deformation from being directly transmitted to the shearing shaft 4, thereby ensuring the rotational accuracy of the spindle and avoiding bearing wear or shearing misalignment caused by thermal deformation.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A shearing mechanism for a desiccant packaging machine, characterized in that, include: A frame (1) is rotatably mounted on one end of the frame (1), and a pressing roller (3) is rotatably mounted on the other end through an elastic guide assembly (2). The pressing roller (3) is parallel to and abuts against the cutting roller. The cutter roller includes a shearing shaft (4), and a plurality of clamping plates (7) are provided on the shearing shaft (4) via a floating flange (5). Blades (9) are provided between the clamping plates (7). Heating elements (10) are axially provided on the clamping plates (7) near the blades (9). The heating elements (10) have elastic electrical connection structures at both ends. The first electrical contact is concentrically located at one end of the shearing shaft (4). When the cutter roller rotates, the first electrical contact is periodically electrically connected to the elastic electrical contact structure. The second electrical contact is concentrically located at the other end of the shearing shaft (4). When the cutter roller rotates, the second electrical contact is always electrically connected to the elastic electrical contact structure.

2. The shearing mechanism for a desiccant packaging machine as described in claim 1, characterized in that: The floating flange (5) is circumferentially engaged with the shear shaft (4) and axially slidably connected. The floating flange (5) is fixedly connected to the shear shaft (4) by fasteners (6).

3. The shearing mechanism for a desiccant packaging machine as described in claim 2, characterized in that: The floating flange (5) has a fan-shaped locking block (501) on its edge. The locking block (501) engages with the end face of the clamping plate (7) to restrict the radial movement of the clamping plate (7).

4. A shearing mechanism for a desiccant packaging machine as described in claim 2, characterized in that: An elastic heat insulation pad (8) is provided between the floating flange (5) and the end face of the clamp (7).

5. A shearing mechanism for a desiccant packaging machine as described in claim 1, characterized in that: The flexible electrical connection assembly includes a connecting piece (13), which is detachably installed at the ends of the two heating elements (10) on both sides of the blade (9). The connecting piece (13) is provided with an electrical contact spring (14) on the outside of the connecting piece (13), which contacts the first electrical contact base and the second electrical contact base.

6. A shearing mechanism for a desiccant packaging machine as described in claim 5, characterized in that: The first electrical connector includes a first insulating seat (15), which is fixedly installed on the inner side of the frame (1). The first insulating seat (15) has an arc-shaped electrical connector (16) on the side facing the heating element (10), and the central angle of the arc-shaped electrical connector (16) is 180 degrees.

7. A shearing mechanism for a desiccant packaging machine as described in claim 5, characterized in that: The second electrical connector includes a second insulating seat (17), which is fixedly installed inside the frame (1). The second insulating seat (17) has an annular electrical connector (18) on the side facing the heating element (10).

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