Circulating conveying mechanism and packaging machine

Abstract

The utility model belongs to the field of circulating motion mechanisms, and discloses a circulating conveying mechanism which is characterized in that a second track is arranged on a first switching mechanism to be driven by the first switching mechanism to be switched between a first position and a second position, when the second track is located at the first position, the second track is communicated with the first track and disconnected with a third track, and when the second track is located at the second position, the second track is communicated with the third track. The track II is disconnected from the track I and is communicated with the track III; the fourth rail is arranged on the second switching mechanism to be driven by the second switching mechanism to be switched between the third position and the fourth position, when the fourth rail is located at the third position, the fourth rail is communicated with the first rail and disconnected from the third rail, and when the fourth rail is located at the fourth position, the fourth rail is disconnected from the first rail and communicated with the third rail; a driving mechanism is arranged on the first rail to drive a first carrier arranged on the rail assembly to advance. The circulating conveying device has the advantages of being small in occupied size and high in circulating conveying efficiency. The utility model further discloses a packaging machine with the circulating conveying mechanism.

Description

Technical Field

[0001] This utility model belongs to the field of cyclic motion mechanisms, and particularly relates to a cyclic conveying mechanism and a packaging machine. Background Technology

[0002] Conveying mechanisms are commonly used in various production lines, such as synchronous belt conveyors, sprocket conveyors, and circular guide rail conveyors. In some applications, it is necessary to combine carriers transported along different conveying paths. During parallel conveying, the carriers originally transported along different paths combine and then separate after a certain distance. The existing method is to set up two traditional circular conveying mechanisms with adjacent and parallel path segments to achieve parallel conveying. However, this method requires extremely high synchronization of the conveying speeds of the two conveying mechanisms, making it difficult to implement. It is also difficult to accurately combine the carriers on the two conveying mechanisms for parallel conveying, and the spacing between the carriers on the two conveying mechanisms must be completely consistent, which easily leads to long conveying path lengths for both conveying mechanisms, large volume, and low circulation efficiency. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model discloses a circulating conveying mechanism, which features a small footprint and high circulating conveying efficiency. This utility model also discloses a packaging machine incorporating the aforementioned circulating conveying mechanism.

[0004] The specific technical solution of this utility model is as follows:

[0005] A circulating conveying mechanism includes a carrier and a track assembly;

[0006] The track assembly includes track one, track two, track three and track four arranged sequentially along a preset circular conveying path;

[0007] The second track is mounted on the first switching mechanism so that it can switch between position one and position two. When the second track is in position one, it engages with the first track and disconnects from the third track. When the second track is in position two, it disconnects from the first track and engages with the third track.

[0008] The fourth track is mounted on the second switching mechanism so that it can be switched between position three and position four by the second switching mechanism. When the fourth track is in position three, the fourth track is engaged with the first track and disconnected from the third track. When the fourth track is in position four, the fourth track is engaged with the first track and connected to the third track.

[0009] A drive mechanism is provided at one point on the track to drive the carrier mounted on the track assembly to move forward.

[0010] The carrier 1 slides along a preset circular conveying path on tracks 1, 2, 3, and 4. When it is desired that carrier 1 enters track 3 from track 1, it needs to transition to track 2, which can be achieved by switching the position of switching mechanism 1, thus maintaining the preset precise alignment in subsequent processes. Similarly, after the corresponding process is completed, when it is desired that carrier 1 re-enter track 1 from track 3, track 4 is used for transition, which can be achieved by switching the position of switching mechanism 2. This reduces the relative movement distance of carrier 1, thereby effectively reducing the length of the conveying path and avoiding an excessively large volume of the circular conveying mechanism, thus ensuring high conveying efficiency. Compared to two traditional circular conveying mechanisms conveying their respective carriers, it also avoids the requirement for synchronization of conveying rates between two traditional circular conveying mechanisms, reducing implementation difficulty.

[0011] Preferably, the circular transport path of the track assembly is generally triangular, and the track one has an arc-shaped path segment;

[0012] The first switching mechanism drives the second track to swing to switch between position one and position two, and the second switching mechanism drives the fourth track to swing to switch between position three and position four.

[0013] This structure can save the assembly volume of the track components, which is beneficial to reduce assembly time and improve process efficiency. The switching mechanism one and switching mechanism two are oscillating actions, so their movement paths are arc-shaped. This structure is more compact and can make better use of limited space for arrangement.

[0014] Preferably, the middle section of the first track is an arc-shaped path segment, and the first track has straight path segments at both ends of the arc-shaped path segment, each of the two straight path segments having a driving mechanism.

[0015] This structure can improve the motion efficiency of carrier one and ensure that tracks two and four are better aligned with tracks two and four when connecting tracks one and three, thereby ensuring the motion stability of carrier one.

[0016] Preferably, the connection surfaces between track 2 and track 1, and between track 2 and track 3, are located on the swing path of switching mechanism 1;

[0017] The connection surfaces between track four and track one, and between track four and track three, are located on the swing path of switching mechanism two.

[0018] The four connecting surfaces mentioned above all correspond to the arc-shaped path, thereby avoiding motion interference, achieving a smooth and compact docking, which helps to reduce the gap between the tracks and thus ensure the smooth movement of the carrier.

[0019] Preferably, the drive mechanism includes:

[0020] The actuating assembly and the transmission component one are driven by the transmission component one to reciprocate along the track one, and the actuating assembly pushes the carrier one to move along the track assembly;

[0021] Alternatively, the drive mechanism may include:

[0022] The second transmission component is a conveyor chain or conveyor belt. In the second transmission component and the first carrier, one has a protrusion and the other has a mating part that connects with the protrusion.

[0023] This drive mechanism has a simple structure, small size, and high driving efficiency. When the drive mechanism includes a toggle assembly and a transmission component, when the transmission component is activated, the toggle assembly first moves along the track one along a preset path to drive the carrier one. Then, the toggle assembly moves in the opposite direction along the track one along the preset path to reach the driving position for the next carrier one. When it moves along the track one along the preset path again, it can drive the carrier one, thereby driving multiple carriers one. When the drive mechanism includes a transmission component two, the transmission component two operates cyclically. Through the connection of the protrusion and the mating part, the movement of the transmission component two drives the movement of the carrier one along the track assembly, thereby also driving multiple carriers one.

[0024] Preferably, the actuating mechanism includes:

[0025] The base connected to the transmission component; and

[0026] A toggle element is movably connected to the base to switch between a working position and a clearance position. When the transmission component drives the toggle element to move forward, the toggle element is in the working position to push the carrier forward. When the transmission component drives the toggle element to move in the reverse direction, the toggle element switches to the clearance position to avoid the carrier.

[0027] Because there is a relative motion relationship between the actuating component and the base, when the actuating component moves in the opposite direction along the preset path, the position of the actuating component can be switched, thereby avoiding the subsequent carrier. After avoiding the carrier, the position is switched again and reset to a position suitable for the movement of the actuating carrier, so that the actuating component is located in a position suitable for the movement of the actuating carrier.

[0028] Preferably, the actuating member and / or the carrier is provided with a sloping clearance portion, so that when the actuating member reverses, the actuating member is driven to switch to the clearance position through the sloping clearance portion.

[0029] When the actuating component moves along the preset path, the actuating component and the subsequent carrier avoid each other through the inclined avoidance part, which effectively avoids motion interference.

[0030] Preferably, the track assembly has multiple carriers 1, each carrier 1 having a pusher 1 on its front side in the direction of travel and a pusher 2 on its rear side in the direction of travel. At least one carrier 1 is driven by a drive mechanism, and adjacent carriers 1 are pushed forward sequentially by the pusher 2 abutting against the pusher 1.

[0031] When traveling along the preset path, the drive mechanism can drive the next carrier. Since the previous carrier needs to maintain continuous movement to enter the second track, the method of using the next carrier to push the previous carrier can ensure that the previous carrier enters the second track, so that the switching component can drive the carrier into the third track for corresponding process operations.

[0032] Preferably, when the first track has an arc-shaped path segment, one of the second pushing part and the first pushing part is a guide wheel, and the other has an arc-shaped mating part.

[0033] The structure is simple and practical, and can adapt to yaw motion, avoiding motion interference when switching mechanism one / switching mechanism two is activated.

[0034] Preferably, it also includes a bearing housing and an eccentric motion mechanism corresponding to the switching mechanism one / switching mechanism two. The switching mechanism one / switching mechanism two is connected to the bearing housing and is driven by the eccentric motion mechanism to switch positions between track one and track three.

[0035] This structure is simple and has high transmission efficiency. It can effectively support the overall drive weight and meet the action requirements of switching mechanism one / switching mechanism two, which helps to ensure the accuracy of the action.

[0036] Preferably, a sliding contact power supply component is provided between the carrier and the track assembly, wherein a sliding contact line is laid on the track assembly, and a brush that cooperates with the sliding contact line is provided on the carrier.

[0037] The sliding contact power supply component can provide conductive current to the components that need to be energized in the circulating conveying mechanism, thereby meeting the actual use requirements. Furthermore, the sliding contact power supply component is adapted to the track assembly setting and can ensure operational stability.

[0038] A packaging machine includes a circulating conveying mechanism as described above; it also includes a second conveying mechanism, which includes a second conveying track and a second carrier moving along the second conveying track. The second conveying track is provided with a parallel track section that is parallel to the third track. The first track switches to position two so that the first carrier on the first track and the second carrier on the parallel track section are connected to form a combined carrier. The combined carrier travels along the parallel track section to position four of the fourth track. The fourth track switches to position three so that the first carrier and the second carrier are separated.

[0039] The three tracks are equipped with a power mechanism one that drives the carrier one forward, and / or the conveying mechanism two is equipped with a power mechanism two that drives the carrier two to move along the conveying track two.

[0040] After carrier one and carrier two are docked to form a combined carrier, the combined carrier is driven by power mechanism one and / or power mechanism two. In other words, after the combined carrier is formed, if power component one drives carrier one to move, carrier two can also follow the movement. Similarly, power mechanism two drives carrier two to move. Thus, it can be seen that carrier one and carrier two have a close fit. Therefore, power mechanism one and power mechanism two can be set at the same time so that they drive the combined carrier to move synchronously. This can avoid the relative movement caused by carrier one and carrier two not being close enough, which would prevent power mechanism one / power mechanism two from driving the combined carrier to move.

[0041] Compared with the prior art, the present invention has a compact structure, which can reduce the volume occupied by the circulating conveying mechanism, avoid high implementation difficulty, and effectively improve the efficiency of circulating conveying. In addition, the present invention utilizes the cooperation between the circulating conveying mechanism and the second conveying mechanism to effectively reduce the synchronization of conveying speed and ensure that the first carrier and the second carrier can be well docked, thereby meeting the process requirements of the packaging machine. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a hidden connecting plate in one direction of the circulating conveying mechanism in an embodiment of this utility model;

[0043] Figure 2 This is a schematic diagram of the circulating conveying mechanism from another direction in an embodiment of this utility model;

[0044] Figure 3 for Figure 2 Enlarged view of point A;

[0045] Figure 4 for Figure 2 Enlarged view of point B;

[0046] Figure 5 This is a cross-sectional view of the actuating mechanism in an embodiment of this utility model;

[0047] Figure 6 This is a schematic diagram of the packaging machine in an embodiment of the present utility model;

[0048] Figure 7 This is another schematic diagram of the circulating conveying mechanism in an embodiment of the present utility model;

[0049] Figure 8 This is a schematic diagram showing the arrangement of the chain component in an embodiment of this utility model.

[0050] In the diagram: 1-Carrier 1; 2-Rail 1; 3-Rail 2; 4-Rail 3; 5-Rail 4; 6-Switching Mechanism 1; 7-Switching Mechanism 2; 8-Connecting Plate; 9-Bearing Seat; 10-Rotating Shaft; 11-Connecting Rod; 12-Cam; 13-Guide Wheel; 14-Arc-shaped Fitting Part; 15-Transmission Component 1; 16-Base; 17-Actuating Component; 18-Reset Component; 19-Inclined Surface 1; 20-Inclined Surface 2; 21-Connecting Surface; 22-Sliding Contact Line; 23-Carrier 2; 24-Conveying Rail 2; 25-Parallel Rail Section; 26-Transmission Component 2; 27-Protrusion; 28-Matching Part. Detailed Implementation

[0051] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to specific embodiments.

[0052] like Figures 1-5 As shown, a circulating conveying mechanism includes a carrier 1 and a track assembly. The track assembly includes a first track 2, a second track 3, a third track 4, and a fourth track 5 arranged sequentially along a preset circular conveying path. The second track 3 is mounted on a switching mechanism 6 to switch between position 1 and position 2. When the second track 3 is in position 1, it engages with the first track 2 and disconnects from the third track 4. When the second track 3 is in position 2, it disconnects from the first track 2 and engages with the third track 4. The fourth track 5 is mounted on a switching mechanism 7 to switch between position 3 and position 4. When the fourth track 5 is in position 3, it engages with the first track 2 and disconnects from the third track 4. When the fourth track 5 is in position 4, it engages with the first track 2 and connects to the third track 4. A driving mechanism is provided at the first track 2 to drive the carrier 1 mounted on the track assembly to move.

[0053] In this embodiment, track 3 (4) is a straight track, and track 1 (2) can be one or a combination of curved and straight tracks. It should be noted that tracks 1 (2), 2 (3), 3 (4), and 4 (5) all have corresponding connecting plates (8) for installation. When carrier 1 (1) is driven to track 2 (3) by the drive mechanism, the switching mechanism 2 (7) can switch track 2 (3) from connecting track 1 (2) to connecting track 3 (4) via a swaying or linear reciprocating drive mechanism. Figure 7As shown, when a linear reciprocating drive mechanism is used, the switching mechanism 6 and the switching mechanism 7 can be configured as a telescopic rod mechanism, a lead screw mechanism, or a rack and pinion mechanism, etc., and the track 2 is suitable to be configured as a linear track. In this embodiment, the annular conveying path of the track assembly is generally triangular, and the track 2 has an arc-shaped path segment; the switching mechanism 6 drives the track 3 to oscillate to switch between position 1 and position 2, and the switching mechanism 7 drives the track 5 to oscillate to switch between position 3 and position 4. That is, the switching mechanism 6 drives the track 3 to move along the arc-shaped path, and the switching mechanism 7 drives the track 5 to move along the arc-shaped path. Furthermore, the switching mechanism 6 and the switching mechanism 7 can be implemented by a disc mechanism, an eccentric motion mechanism, etc. Because tracks 2 (3) and 4 (5) have arc-shaped yaw motion, the track volume can be further reduced compared to straight-line motion. After using the yaw motion switching mechanism 1 (6) / switching mechanism 2 (7), the transmission efficiency is not affected. Furthermore, in this embodiment, tracks 2 (3), 3 (4), and 4 (5) are all straight-line paths. Therefore, in order to ensure the accuracy of the docking between tracks and meet the smooth movement of carrier 1, when track 2 (3) docks with track 1 (2), track 2 (3) is tangent to track 1 (2). The same applies to track 4 (5) and track 1 (2), as well as track 2 (3) and track 3 (4), and track 4 (5) and track 3 (4).

[0054] like Figure 1 As shown, further, in this embodiment, the switching mechanism 6 and the switching mechanism 7 adopt an eccentric motion mechanism. Specifically, it also includes a bearing seat 9 and an eccentric motion mechanism corresponding to the switching mechanism 6 / switching mechanism 7. The switching mechanism 6 / switching mechanism 7 are connected to the bearing seat 9 and driven by the eccentric motion mechanism to switch positions between track 2 and track 4. Taking the switching mechanism 6 as an example, the eccentric motion mechanism includes a rotating shaft 10 and a connecting rod 11. A cam 12 is provided on the rotating shaft 10. One end of the connecting rod 11 is hinged to the cam 12, and the other end is hinged to track 3. Thus, during the rotation of the rotating shaft 10 around its own axis, the eccentric motion of the cam 12 causes the connecting rod 11 to drive track 3 to swing, thereby realizing the position switch between track 2 and track 4.

[0055] In this embodiment, as Figure 1As shown, to simplify configuration and improve debugging efficiency, the middle section of track 2 is an arc-shaped path segment. Both ends of the arc-shaped path segment of track 2 are straight path segments, each with a driving mechanism. That is, each driving mechanism drives carrier 1 within its corresponding straight path segment. To enable carrier 1 to better pass through the arc-shaped path segment and smoothly enter track 3, in this embodiment, the track assembly has multiple carriers 1. Each carrier 1 has a pushing part 1 on its front side in the direction of travel and a pushing part 2 on its rear side in the direction of travel. At least one carrier 1 is driven by the driving mechanism, and adjacent carriers 1 are pushed forward sequentially by the pushing part 2 abutting against the pushing part 1. Figure 2 , Figure 3 As shown, let the previous carrier-1 be carrier-A, and the next carrier-1 be carrier-B. Thus, carrier-B, driven by the driving mechanism, pushes carrier-A to move. It should be noted that the track assembly has multiple carriers-1, so using a pushing method to achieve re-driving can effectively achieve the driving effect. At this time, track-2 has an arc-shaped path segment. Therefore, to prevent the pushed carrier-A from being unable to slide along track-2 due to changes in curvature, one of the pushing part 2 and pushing part 1 is a guide wheel 13, and the other has an arc-shaped mating part 14. When carrier-B is driven, the arc-shaped mating part 14 pushes against the guide wheel 13, thereby causing carrier-A to move. When it reaches the arc-shaped path segment, the guide wheel 13 rolls along the arc-shaped mating part 14. It should be noted that, as... Figures 1-3 As shown, when carrier 1 is located on track 2, it can be seen that in the direction of travel of carrier 1, the first pushing part is an arc-shaped fitting part 14, and the second pushing part is a guide wheel 13. When carrier 1 is located on track 34, in the direction of travel of carrier 1, the first pushing part is a guide wheel 13, and the second pushing part is an arc-shaped fitting part 14. Obviously, no matter where carrier 1 is located on the track, it still maintains its direction of travel. The first pushing part is set on the front side, and the second pushing part is set on the rear side. That is to say, one of the first pushing part and the second pushing part is an arc-shaped fitting part 14, and the other is a guide wheel 13, so as to realize that carrier 1B pushes carrier 1A to travel.

[0056] like Figure 1As shown, since the switching mechanism 6 and the switching structure 2 are oscillating actions, in this embodiment, the connecting surface 21 between the second track 3 and the first track 2, and the connecting surface 21 between the second track 3 and the third track 4 are located on the oscillation path of the switching mechanism 6; the connecting surface 21 between the fourth track 5 and the first track 2, and the connecting surface 21 between the fourth track 5 and the third track 4 are located on the oscillation path of the switching mechanism 7. Taking switching mechanism 6 as an example, when switching mechanism 6 is activated, its free end forms an arc under the driving action. At this time, the connecting surface 21 between track 2 and track 3, and the connecting surface 21 between track 2 and track 3 are both within the arc formed by the free end of switching mechanism 6, or located outside the arc. When it is within the arc formed by the free end of switching mechanism 6, taking track 2 and track 3 as an example, their connecting surfaces 21 overlap. That is to say, during the operation of switching mechanism 6, the connecting surface 21 between track 2 and track 3 contacts and slides. When the connecting surface 21 between track 2 and track 3 is located outside the arc, it is equivalent to a small gap between the end face of track 2 and the end face of track 3. This gap does not affect the sliding of carrier 1 at that point.

[0057] In this embodiment, the driving mechanism includes a toggle assembly and a transmission component 15. The toggle assembly is driven by the transmission component 15 to reciprocate along the track 2, and the toggle assembly pushes the carrier 1 along the track assembly. The transmission component 15 can be a telescopic mechanism, a lead screw mechanism, a linear module, etc. Further, the toggle assembly includes a base 16 that is drively connected to the transmission component 15, and a toggle component 17. The toggle component 17 is movably connected to the base 16 to switch between a working position and a clearance position. When the transmission component 15 drives the toggle assembly to move forward, the toggle component 17 is in the working position to push the carrier 1 forward. When the transmission component 15 drives the toggle assembly to move in the reverse direction, the toggle component 17 switches to the clearance position to avoid the carrier 1. In this embodiment, the transmission component 15 drives the actuating assembly to reciprocate along the track 2. Therefore, when the actuating assembly moves in the reverse direction along the preset path, it will come into contact with the carrier B, causing motion interference. Therefore, the actuating component 17 and the base 16 are hinged. That is, when the actuating component 17 contacts the carrier B, the actuating component 17 rotates relative to the base 16 to avoid the carrier B during the reverse movement. After avoiding the carrier B, it is reset by the reset component 18. In some embodiments, the reset is achieved by the gravity of the actuating component 17 itself. In this case, a stop is provided on the base 16 to limit the movement of the actuating component 17, thus achieving the same movement avoidance of the carrier B and reset after avoidance. Therefore, the switching method between the working position and the avoidance position of the actuating component 17 is simple and easy to implement, and can well meet the driving requirements of the carrier 1. Furthermore, the actuating member 17 and / or the carrier 1 are provided with a sloped clearance portion, so that when the actuating member moves in the reverse direction, the sloped clearance portion drives the actuating member 17 to switch to the clearance position. It is understood that since the purpose of the sloped clearance portion is to avoid motion interference caused by the reverse movement of the actuating member 17, the sloped clearance portion can be provided on the actuating member 17 and / or the carrier 1B. In this embodiment, for example... Figure 4 As shown, the inclined surface avoidance part includes an inclined surface 19 disposed on the actuating member 17 and an inclined surface 20 disposed on the carrier 1B. When the actuating member 17 and the carrier 1B come into contact, the inclined surface 19 slides along the inclined surface 20, causing the actuating member 17 to swing relative to the base 16, thereby achieving avoidance through the inclined surface 20. This structure is simple and easy to implement.

[0058] It should be noted that in some other embodiments, the track 2 is still configured as one or a combination of curved and straight tracks. At any given time, only one carrier 1 moves on the track 2. Therefore, when the carrier 1 moves on the track 2, there is no other carrier 1 in contact with it. At this time, the actuating assembly drives the carrier 1 from the beginning of the track 2 to the end of the track 2, and then the actuating assembly returns to the beginning of the track 2, thereby driving the other carrier 1 to move. It should also be noted that in this embodiment, there is no need to set up a ramp avoidance part.

[0059] like Figure 8 As shown, in another embodiment, the driving mechanism includes a second transmission component 26, which is a conveyor chain or conveyor belt. One of the transmission component 26 and the carrier 1 has a protrusion 27, and the other has a mating portion 28 that engages with the protrusion 27. Compared to the above embodiment, this embodiment does not require the carrier 1B to drive the movement of the carrier 1A by pushing. That is, when the driving mechanism includes the second transmission component 26, each carrier 1 moves independently. Therefore, when the track assembly is triangular, it can prevent the carrier 1 from sliding due to gravity on the downward path (track 23), thus avoiding the preset running error of the carrier 1 and also preventing collisions between adjacent carriers 1.

[0060] The protrusion 27 is provided on the carrier 1, thereby the mating part 28 is configured as the gap between two adjacent links. That is, when the carrier 1 transitions from track 4 5 to track 1 2 and from track 1 2 to track 2 3, the protrusion 27 extends into the gap between two adjacent links, thereby driving the carrier 1 during the cyclic movement of the transmission member 2 26.

[0061] In this embodiment, power needs to be supplied to some components on the circulating conveying mechanism, such as switching mechanism 6, switching mechanism 7, and some electrical components disposed on carrier 1. In this embodiment, a sliding contact power supply component is disposed between carrier 1 and the track assembly. The track assembly is provided with a sliding contact line 22, and the carrier 1 is provided with a brush that cooperates with the sliding contact line 22. The sliding contact line 22 is disposed along the track assembly, while the brush is disposed on carrier 1. Thus, during the movement of carrier 1, the brush can maintain an electrical connection with the sliding contact line 22 through sliding contact, thereby ensuring power supply.

[0062] Based on the above embodiments, such as Figure 6As shown, this embodiment also discloses a packaging machine, which further includes a second conveying mechanism. The second conveying mechanism includes a second conveying track 24 and a second carrier 23 that moves along the second conveying track 24. The second conveying track 24 is provided with a parallel track section 25 that is parallel to the third track 4. The first track 2 is switched to position 2 so that the carrier 1 on the first track 2 and the carrier 23 on the parallel track section 25 are connected to form a combined carrier. The combined carrier moves along the parallel track section 25 to the fourth track 5 at position 4. The fourth track 5 is switched to position 3 so that the carrier 1 and the carrier 23 are separated. The third track 4 is provided with a first power mechanism for driving the carrier 1 to move, and / or the second conveying mechanism is provided with a second power component for driving the carrier 23 to move along the second conveying track 24.

[0063] When a packaging machine needs to seal a packaging container, it is generally necessary to vacuum the packaging container to extend its shelf life. In this embodiment, carrier 1 and carrier 23 are configured as an upper vacuum chamber and a lower vacuum chamber, respectively. Carrier 1 moves to track 3 4 under the drive of the circulating conveying mechanism. Similarly, carrier 23 moves to the parallel track section 25 of conveying track 24 under the drive of power component 2, thereby connecting carrier 1 on track 3 4 and carrier 23 on parallel track section 25. At this time, a vacuum space can be formed by extracting the air between carrier 1 and carrier 2 23, so that carrier 1 and carrier 2 23 are tightly bonded by negative pressure. When power component 1 and power component 2 are set at the same time, vacuum breaking can be avoided. However, in actual operation, the negative pressure formed by vacuuming is relatively large. Setting only power component 1 or power component 2 can achieve simultaneous driving of carrier 1 and carrier 2 23. After adjustment, the negative pressure is also suitable for driving carrier 1 and carrier 2 23 to move simultaneously and avoid vacuum breaking due to relative movement between the two. Specifically, in order to rationally configure the assembly space, this embodiment sets up a second conveying track 24 and configures the second power component as a gear chain component. The second carrier 23 is driven to circulate through the gear chain component, so as to realize the movement of the carrier on the parallel track segment 25 of the third track 4 / the second conveying track 24.

[0064] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A circulating conveying mechanism, characterized in that, Includes carrier one and track assembly; The track assembly includes track one, track two, track three and track four arranged sequentially along a preset circular conveying path; The second track is mounted on the first switching mechanism so that it can switch between position one and position two. When the second track is in position one, it engages with the first track and disconnects from the third track. When the second track is in position two, it disconnects from the first track and engages with the third track. The fourth track is mounted on the second switching mechanism so that it can be switched between position three and position four by the second switching mechanism. When the fourth track is in position three, the fourth track is engaged with the first track and disconnected from the third track. When the fourth track is in position four, the fourth track is engaged with the first track and connected to the third track. A drive mechanism is provided at one point on the track to drive the carrier mounted on the track assembly to move forward.

2. The circulating conveying mechanism as described in claim 1, characterized in that, The overall circular transport path of the track assembly is triangular, and the first track has an arc-shaped path segment; The first switching mechanism drives the second track to swing to switch between position one and position two, and the second switching mechanism drives the fourth track to swing to switch between position three and position four.

3. A circulating conveying mechanism as described in claim 2, characterized in that, The middle section of the track is an arc-shaped path segment, and straight path segments are provided at both ends of the arc-shaped path segment. Each of the two straight path segments has a driving mechanism.

4. A circulating conveying mechanism as described in claim 2, characterized in that, The connection surfaces between track 2 and track 1, and between track 2 and track 3, are located on the swing path of switching mechanism 1. The connection surfaces between track four and track one, and between track four and track three, are located on the swing path of switching mechanism two.

5. A circulating conveying mechanism as described in claim 1, characterized in that, The drive mechanism includes: The actuating assembly and the transmission component one are driven by the transmission component one to reciprocate along the track one, and the actuating assembly pushes the carrier one to move along the track assembly; Alternatively, the drive mechanism may include: The second transmission component is a conveyor chain or conveyor belt. In the second transmission component and the first carrier, one has a protrusion and the other has a mating part that connects with the protrusion.

6. A circulating conveying mechanism as described in claim 5, characterized in that, The actuating assembly includes: The base connected to the transmission component; and A toggle element is movably connected to the base to switch between a working position and a clearance position. When the transmission component drives the toggle element to move forward, the toggle element is in the working position to push the carrier forward. When the transmission component drives the toggle element to move in the reverse direction, the toggle element switches to the clearance position to avoid the carrier.

7. A circulating conveying mechanism as described in claim 6, characterized in that, The actuating element and / or the carrier are provided with a sloping clearance portion, so that when the actuating element reverses, the actuating element is driven to switch to the clearance position through the sloping clearance portion.

8. A circulating conveying mechanism as described in claim 1 or 2, characterized in that, The track assembly has multiple carriers 1. Each carrier 1 has a pusher 1 on its front side in the direction of travel and a pusher 2 on its rear side in the direction of travel. At least one carrier 1 is driven by a drive mechanism. Adjacent carriers 1 are pushed forward in sequence by the pusher 2 abutting against the pusher 1.

9. A circulating conveying mechanism as described in claim 8, characterized in that, When the first track has an arc-shaped path segment, one of the second pusher and the first pusher is a guide wheel, and the other has an arc-shaped mating part.

10. A circulating conveying mechanism as described in claim 1, characterized in that, It also includes a bearing housing and an eccentric motion mechanism corresponding to the switching mechanism one / switching mechanism two. The switching mechanism one / switching mechanism two is connected to the bearing housing and is driven by the eccentric motion mechanism to switch positions between track one and track three.

11. A circulating conveying mechanism as described in claim 1, characterized in that, A sliding contact power supply component is provided between the carrier and the track assembly, wherein a sliding contact line is laid on the track assembly, and a brush that cooperates with the sliding contact line is provided on the carrier.

12. A packaging machine, characterized in that, Includes a circulating conveying mechanism as described in any one of claims 1 to 11; It also includes a second conveying mechanism, which includes a second conveying track and a second carrier moving along the second conveying track. The second conveying track is provided with a parallel track section that is parallel to the third track. The first track switches to position two so that the first carrier on the first track and the second carrier on the parallel track section can dock to form a combined carrier. The combined carrier travels along the parallel track section to position four of the fourth track. The fourth track switches to position three so that the first carrier and the second carrier can separate. The track is equipped with a power mechanism 1 that drives the carrier to move forward at three points, and / or the conveying mechanism 2 is equipped with a power component 2 that drives the carrier 2 to move along the conveying track 2.

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