Vacuum switching structure of vacuum forming packaging machine

Abstract

The utility model discloses a vacuum switching structure of a vacuum forming packaging machine, which comprises a central shaft tube, a vacuum switching piece, a forming roller, a forming concave cavity and an adjusting plate, the adjusting plate is fixedly connected with the forming roller, the vacuum switching piece is attached to the adjusting plate, an inner cavity is arranged on the attached surface of the vacuum switching piece, and the forming concave cavity is arranged in the inner cavity. A first air pipe connector is arranged on the inner surface of the forming roller, a second air pipe connector is arranged on the adjusting plate and communicated with the attaching face of the vacuum switching piece and the adjusting plate, and an inner cavity of the vacuum switching piece is adjustably communicated with the second air pipe connector. The air flow passages between the forming concave cavity and the vacuum switching piece are communicated through the first air pipe connector, the air pipe and the second air pipe connector, the machining precision and difficulty are reduced, the air tightness is better, installation and debugging are easy, and the problem of abnormal shutdown caused by local faults is avoided; the boundary dimension of the packaging machine is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum packaging, in particular to a vacuum switching structure of a vacuum forming packaging machine. Background Art

[0002] The vacuum forming process includes operations such as vacuuming the film when it is inserted into the film so that the film is adsorbed on the cavity of the forming roller, filling, sealing, slitting and demoulding. The multiple groups of forming cavities on the forming roller are in different working states due to their different positions. Vacuuming is required to form beads between the film insertion position and the demoulding position, and the vacuum needs to be released when demoulding. However, the existing vacuum forming machines have some defects: First, multiple vacuum control valves are used to rotate with the cavity and rely on mechanical contact to identify the workstation to control the vacuum state. Due to the large number of cavity groups, there are many control valves and the structure is complex. If a single control valve fails, the entire machine needs to be shut down for maintenance, resulting in high failure rate and maintenance cost. Second, a fixed vacuum switching block is provided on the outer side of the roller, and vacuum control is achieved by switching the air path structure and relative position between the cavity and the side panel of the roller. However, its air path structure is complex, the air tightness requirements between the various processed parts are high, and the processing and installation accuracy requirements are stringent, resulting in long processing time, long production cycle, and difficult installation and debugging. In addition, the external vacuum switching block occupies a large area, which increases the size and cost of the packaging machine. Utility Model Content

[0003] (1) Technical problems to be solved

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a vacuum switching structure of a vacuum forming packaging machine, aiming to solve the technical problems existing in the existing technology.

[0005] (2) Technical solution

[0006] The utility model provides a vacuum switching structure of a vacuum forming packaging machine, comprising a central axis tube connected to a vacuum pump, a vacuum switching component fixed in the middle of the central axis tube, a forming roller axially connected to both ends of the central axis tube, a forming cavity arranged on the outer surface of the forming roller, and an adjustment plate capable of adjusting the connection state between the forming cavity and the vacuum switching component, wherein the adjustment plate is fixedly connected to the forming roller, the vacuum switching component is fitted with the adjustment plate, an inner cavity is provided on the fitted surface of the vacuum switching component, a first air pipe joint connected to the forming cavity is provided on the inner surface of the forming roller, a second air pipe joint for connecting to the first air pipe joint through an air pipe is provided on the adjustment plate, the second air pipe joint is connected to the fitting surface of the vacuum switching component and the adjustment plate, and the inner cavity of the vacuum switching component and the second air pipe joint are adjustably connected.

[0007] Preferably, the forming cavities are provided in multiple groups on the outer surface of the forming drum, wherein any group of the forming cavities includes a plurality of mold grooves arranged along the axial direction, and the lower ends of the plurality of mold grooves are provided with suction grooves connected to a first air pipe joint.

[0008] Preferably, several groups of the forming cavities are arranged in a circular array with the central axis tube as the center, and several of the first air pipe joints are also arranged in an array.

[0009] Preferably, the number of second air pipe joints to be connected with the first air pipe joint is set to correspond to a number, and the second air pipe joints are arranged in a circular array on the adjustment plate with the central axis tube as the center.

[0010] Preferably, the shape of the inner cavity between the adjustment plate and the contact surface of the vacuum switching component is an arc that matches the arrangement shape of the second air pipe joint.

[0011] Preferably, the vacuum switching component is provided with an L-shaped connecting pipe connected to the inner cavity, the central axis tube is provided with a connecting hole connected to the inside and outside, and the L-shaped connecting pipe is installed in the connecting hole through the air pipe.

[0012] Preferably, support frames are provided on both sides of the forming drum, and a fixing rod connected to the support frames is provided on the other side of the contact surface between the adjustment plate and the vacuum switching member.

[0013] Preferably, a avoidance hole is provided in the middle of the vacuum switching component for the central axis tube to pass through, the diameter of the avoidance hole is larger than the diameter of the outer wall of the central axis tube, and a fixing plate connected to the central axis tube is provided on the other side of the fitting surface of the vacuum switching component and the adjustment plate.

[0014] (3) Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model is provided with a forming roller shaft connected to the central axis tube, and when the forming roller is driven to rotate by external force, the adjusting plate rotates synchronously, so that the channel between the second air pipe joint and the inner cavity where the adjusting plate and the vacuum switching part are in contact is continuously connected or closed as the adjusting plate rotates. When in use, the outer surface of the forming roller is covered with a water-soluble film, and the vacuum pump is started to evacuate the central axis tube and the inner cavity of the vacuum switching part. As the adjusting plate rotates, the second air pipe joint is connected to the first air pipe joint and switches back and forth between the state of vacuuming to generate negative pressure and the state of not evacuating to maintain normal pressure. Therefore, the forming concave cavity connected to the first air pipe joint and the water-soluble film covering it is also synchronously switched back and forth between the state of negative pressure adsorption to meet the requirements of the condensed bead molding process and the state of normal pressure molding and removing materials, thereby realizing the vacuum switching operation;

[0017] In the utility model, the air flow route between the molding cavity and the vacuum switching component is connected by the first air pipe joint, the air pipe and the second air pipe joint. Compared with the prior art solution that requires processing deep holes on the vertical plate of the molding drum as the connecting air flow path, the processing accuracy and difficulty are greatly reduced, and the processing cost and processing time are reduced. The air pipes are connected by the air pipe joint, which has better air tightness and is easy to install and debug, avoiding the problem of abnormal shutdown caused by local failure. In addition, the vacuum switching component is placed inside the molding drum, which greatly reduces the external dimensions of the packaging machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of the utility model.

[0019] Figure 2 It is a right view of the utility model.

[0020] Figure 3 for Figure 2 Cross-section view at AA in the middle.

[0021] Figure 4 This is a rear view of the utility model with one side support frame removed.

[0022] Figure 5 This is a right side view of the utility model with the forming roller removed.

[0023] Figure 6 This is a three-dimensional structural diagram without the forming roller.

[0024] Figure 7 It is a rear view of the vacuum switching component in the present invention.

[0025] The markings of the components in the accompanying drawings are as follows:

[0026] 1. Central axis tube; 11. Connecting hole; 2. Vacuum switching element; 21. Inner cavity; 22. L-shaped connecting tube; 23. Avoidance hole; 24. Fixing plate; 3. Forming roller; 31. First air pipe joint; 32. Support frame; 4. Forming cavity; 41. Mold groove; 42. Suction groove; 5. Adjusting plate; 51. Second air pipe joint; 52. Fixing rod. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] See also Figure 1-7The utility model provides a vacuum switching structure of a vacuum forming packaging machine, including a central axis tube 1 connected to a vacuum pump, a vacuum switching component 2 fixed in the middle of the central axis tube 1, a forming roller 3 axially connected to both ends of the central axis tube 1, a forming cavity 4 arranged on the outer surface of the forming roller 3, and an adjustment plate 5 that can adjust the connection state between the forming cavity 4 and the vacuum switching component 2. The adjustment plate 5 is fixedly connected to the forming roller 3, the vacuum switching component 2 is fitted with the adjustment plate 5, and an inner cavity 21 is provided on the fitting surface of the vacuum switching component 2, and a first air pipe joint 31 connected to the forming cavity 4 is provided on the inner surface of the forming roller 3, and a second air pipe joint 51 is provided on the adjustment plate 5 for connecting the first air pipe joint 31 through an air pipe, and the second air pipe joint 51 is connected to the vacuum switching component 2 and the fitting surface of the adjustment plate 5, and the inner cavity 21 of the vacuum switching component 2 and the second air pipe joint 51 are adjustably connected.

[0029] The utility model is provided with a forming roller 3 axially connected to the central axis tube 1. When the forming roller 3 is driven by an external force to rotate, the adjusting plate 5 rotates synchronously, so that the passage between the second air pipe joint 51 and the inner cavity 21 where the adjusting plate 5 is in contact with the vacuum switching member 2 is continuously connected or closed as the adjusting plate 5 rotates. When in use, the outer surface of the forming roller 3 is covered with a water-soluble film, and the vacuum pump is started to evacuate the central axis tube 1 and the inner cavity 21 of the vacuum switching member 2. The second air pipe joint 51 switches back and forth between the state of vacuuming to generate negative pressure and the state of not evacuating to maintain normal pressure as the adjusting plate 5 rotates and connects to the first air pipe joint 31. Therefore, the water-soluble film covered on the upper surface of the forming cavity 4 connected to the first air pipe joint 31 is also synchronously switched back and forth between the state of negative pressure adsorption to meet the requirements of the condensed bead molding process and the state of normal pressure molding and stripping, thereby realizing the vacuum switching operation;

[0030] In the present invention, the air flow route between the forming cavity 4 and the vacuum switching component 2 is connected by the first air pipe joint 31, the air pipe and the second air pipe joint 51. Compared with the prior art solution that requires processing deep holes on the vertical plate of the forming drum 3 as the connecting air flow path, the processing accuracy and difficulty are greatly reduced, and the processing cost and processing time are reduced. Moreover, the air pipes are connected by the air pipe joint, which has better air tightness and is easy to install and debug, avoiding the problem of abnormal shutdown caused by local failure. In addition, the vacuum switching component 2 is placed inside the forming drum 3, which greatly reduces the external dimensions of the packaging machine.

[0031] like Figure 1-3As shown, the forming cavities 4 in the embodiment of the present invention are provided with multiple groups on the outer surface of the forming drum 3, wherein any group of the forming cavities 4 includes a plurality of mold grooves 41 arranged along the axial direction, and a plurality of the mold grooves 41 are provided with a distribution suction groove 42 connected to a first air pipe joint 31 at the lower end. The plurality of mold grooves 41 arranged along the axial direction can perform multi-unit vacuum forming operations at the same time, and the negative pressure from the first air pipe joint 31 is distributed to each mold groove 41 through the distribution suction groove 42, thereby improving production efficiency and packaging processing volume.

[0032] Further, such as Figure 4 As shown, several groups of molding cavities 4 are arranged in a circular array with the central axis tube 1 as the center, and several first air pipe joints 31 are also arranged in an array. The circular array distribution makes the molding cavities 4 evenly distributed on the molding roller 3, fully utilizing the circumferential space of the roller and improving the molding capacity per unit area. The array-type first air pipe joints 31 match the layout of the molding cavities 4, and can provide gas transmission channels for each molding cavity 4 more efficiently and accurately, ensuring the consistency of air pressure control of each molding cavity 4 during the vacuum switching process, thereby ensuring that the products produced by all molding cavities 4 are highly uniform in quality and specifications, reducing the defective rate, improving the overall production efficiency and product quality stability, and also facilitating the pipeline connection and system integration design of the equipment, reducing the complexity of production and maintenance.

[0033] Since there are multiple groups of molding cavities 4, each group of molding cavities 4 corresponds to an air pipe connector, so the number of second air pipe connectors 51 on the adjustment plate 5 is synchronized with the number of first air pipe connectors 31. Different second air pipe connectors 51 have different connection states with the vacuum switching member 2 as the adjustment plate 5 rotates, thereby controlling different vacuum states between different groups of molding cavities 4 at the same time. Specifically, the number of second air pipe connectors 51 connected to the first air pipe connector 31 is corresponding to the number of second air pipe connectors 51. The second air pipe connectors 51 are arranged in a circular array on the adjustment plate 5 with the central axis tube 1 as the center of the circle. The second air pipe connectors 51 are arranged in an array and can be directly connected to the first air pipe connector 31 on the radius of the circle. During the installation stage of the equipment, the operator can quickly and accurately connect each air pipe connector according to the rules of the array layout, without the need for complicated line planning and debugging, thereby improving installation efficiency. When the air pipe connectors need to be disassembled for equipment maintenance or repair, this corresponding connection method makes the disassembly process of single or multiple air pipe connectors clear and easy to operate, thereby reducing the maintenance difficulty and workload.

[0034] Further, such as Figure 5-7As shown, the shape of the inner cavity 21 between the fitting surface of the adjustment plate 5 and the vacuum switching component 2 is an arc that matches the arrangement shape of the second air pipe joint 51. When the packaging machine is running, the vacuum adsorption or stripping timing of each group of forming cavities 4 can be flexibly adjusted according to the requirements of different processes to achieve diversified packaging processes. Some forming cavities 4 can adsorb the loading while other cavities are performing normal pressure forming and stripping.

[0035] The vacuum switching component 2 in the embodiment of the present invention is provided with an L-shaped connecting tube 22 connected to the inner cavity 21, and the central axis tube 1 is provided with a connecting hole 11 connecting the inside and the outside. The L-shaped connecting tube 22 is installed through the trachea to connect the connecting hole 11. The L-shaped connecting tube can prevent the trachea from bending, aging and cracking, thereby ensuring the airtightness and stability of the vacuum switching system.

[0036] In the embodiment of the present invention, support frames 32 are provided on both sides of the forming roller 3, and a fixing rod 52 connecting the support frame 32 is provided on the other side of the contact surface between the adjustment plate 5 and the vacuum switching member 2. By setting the fixing rod 52, the adjustment plate 5 is fixedly connected to the forming roller 3, so that the adjustment plate 5 is synchronously driven to rotate when the forming roller 3 rolls.

[0037] The vacuum switching component 2 in the embodiment of the present utility model is provided with a avoidance hole 23 in the middle part for the central axis tube 1 to pass through. The aperture of the avoidance hole 23 is larger than the diameter of the outer wall of the central axis tube 1. A fixing plate 24 connected to the central axis tube 1 is provided on the other side of the fitting surface of the vacuum switching component 2 and the adjustment plate 5. Since the vacuum switching component 2 and the adjustment plate 5 frequently move relative to each other during operation, the friction between their fitting surfaces can easily cause vibration. By indirectly fixing the vacuum switching component 2 with the fixing plate 24, the vacuum switching component 2 and the central axis tube 1 are firmly connected to form a relatively stable structural system, which effectively isolates the vibration generated by friction from being transmitted to the pump, avoids the pump from becoming unstable due to additional vibration interference, ensures the reliability and stability of the equipment operation, reduces the probability of failure caused by vibration, extends the service life of the equipment and reduces the frequency of maintenance.

[0038] The above description is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application fall within the scope of the technical solution of the present application.

Claims

1. A vacuum switching structure for a vacuum forming packaging machine, characterized in that: The invention comprises a central axis tube (1) connected to a vacuum pump, a vacuum switching element (2) fixed in the middle of the central axis tube (1), a forming roller (3) connected to both ends of the central axis tube (1), a forming cavity (4) arranged on the outer surface of the forming roller (3), and an adjusting plate (5) capable of adjusting the connection state between the forming cavity (4) and the vacuum switching element (2), wherein the adjusting plate (5) is fixedly connected to the forming roller (3), the vacuum switching element (2) is fitted on the adjusting plate (5), and the vacuum switching element ( 2) An inner cavity (21) is provided on the bonding surface, a first air pipe joint (31) connected to the molding cavity (4) is provided on the inner surface of the molding roller (3), a second air pipe joint (51) for connecting to the first air pipe joint (31) through an air pipe is provided on the adjustment plate (5), the second air pipe joint (51) is connected to the bonding surface of the vacuum switching component (2) and the adjustment plate (5), and the inner cavity (21) of the vacuum switching component (2) and the second air pipe joint (51) are adjustable.

2. The vacuum switching structure of a vacuum forming packaging machine according to claim 1, characterized in that: The molding cavities (4) are provided in multiple groups on the outer surface of the molding roller (3), wherein any group of the molding cavities (4) includes a plurality of mold grooves (41) arranged along the axial direction, and a plurality of the mold grooves (41) are provided with a suction groove (42) connected to a first air pipe joint (31) at the lower end.

3. The vacuum switching structure of a vacuum forming packaging machine according to claim 2, characterized in that: A plurality of groups of the forming cavities (4) are arranged in a circular array with the central axis tube (1) as the center, and a plurality of the first air pipe joints (31) are also arranged in an array.

4. The vacuum switching structure of a vacuum forming packaging machine according to claim 3, characterized in that: The first air pipe joint (31) is matched with a corresponding number of second air pipe joints (51), and the second air pipe joints (51) are arranged in a circular array on the adjustment plate (5) with the central axis tube (1) as the center.

5. The vacuum switching structure of a vacuum forming packaging machine according to claim 4, characterized in that: The shape of the inner cavity (21) between the contact surface of the adjustment plate (5) and the vacuum switching member (2) is an arc that matches the arrangement shape of the second air pipe joint (51).

6. The vacuum switching structure of a vacuum forming packaging machine according to claim 1, characterized in that: The vacuum switching element (2) is provided with an L-shaped connecting pipe (22) connected to the inner cavity (21); the central axis tube (1) is provided with a connecting hole (11) connected to the inside and outside; the L-shaped connecting pipe (22) is connected to the connecting hole (11) through an air pipe.

7. The vacuum switching structure of a vacuum forming packaging machine according to claim 1, characterized in that: Support frames (32) are provided on both sides of the forming roller (3), and a fixing rod (52) connected to the support frame (32) is provided on the other side of the contact surface between the adjustment plate (5) and the vacuum switching member (2).

8. The vacuum switching structure of a vacuum forming packaging machine according to claim 1, characterized in that: A position-avoiding hole (23) for the central axis tube (1) to pass through is provided in the middle of the vacuum switching member (2), and the diameter of the position-avoiding hole (23) is larger than the diameter of the outer wall of the central axis tube (1). A fixing plate (24) connected to the central axis tube (1) is provided on the other side of the contact surface between the vacuum switching member (2) and the adjustment plate (5).

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