A Rotating Corner Structure and Its Grooved Switching Device

Abstract

The present invention discloses a rotary corner structure and its grooved switching device, which includes a fixed seat and a corner grooved belt hinged to the fixed seat. One end of the corner grooved belt is used to communicate with a vertical fixed grooved belt, and the other end is used to communicate with a sword-passing grooved belt or a horizontal fixed grooved belt. The sword-passing grooved belt is parallel to the horizontal fixed grooved belt and is located above it. A return spring is also connected between the corner grooved belt and the fixed seat; after the sword-passing grooved belt extends from the fixed seat towards the corner grooved belt, it can drive the corner grooved belt to deflect and make it communicate with the sword-passing grooved belt; after the sword-passing grooved belt is retracted, the return spring can drive the corner grooved belt to reset and make it communicate with the horizontal fixed grooved belt. The present invention enables the corner grooved belt to not only communicate with the vertical fixed grooved belt and the horizontal fixed grooved belt, but also communicate with the vertical fixed grooved belt and the sword-passing grooved belt, thereby enabling the conversion of multiple functions, being applicable to both the packaging of goods with pallets and the packaging of goods without pallets, and having strong versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of packing machines, and particularly to a rotary corner structure and a grooved switching device thereof. Background Art

[0002] When a packing machine packs, it uses a packing tape to wind around a product or a package, and then tightens and welds the connection. In this process, a grooved component needs to be arranged around the object to be packed, so as to be able to constrain the path of the packing tape, so that the packing tape can move within the annular track formed by the grooved component and be connected into a ring to bundle the object to be packed. For some objects to be packed, such as goods on a pallet, it is usually necessary to pass the packing tape through the holes of the pallet to pack the pallet and the goods together. At this time, a sword-piercing grooved is required. When the goods together with the pallet move to the packing position, the sword-piercing grooved extends into the holes of the pallet, so that each grooved component forms a ring. After packing is completed, the sword-piercing grooved needs to be reset to move the goods out of the packing position. The sword-piercing grooved with the above structure can only be applied to this single working condition during application, and cannot pack goods without a pallet, and the versatility is not strong.

[0003] The Chinese patent with the authorization announcement number of CN 214566362 U discloses a full-automatic side bundling machine, including a packing machine packing tape feeder, an adjustable sword-piercing device of the packing machine, a grooved guiding gantry device, a gear-rack moving slide rail device, a high-tensile buffer device of the bundling head, a packing tape turning device, a modular up-and-down adjustable device, a side-in-place sensing device, an adjustable sword-piercing cover plate supporting device, a gantry sliding inclined support device and a bundling head. This solution uses the adjustable sword-piercing device of the packing machine to control the extension and retraction of the sword-piercing grooved, which extends when packing and retracts after packing is completed. However, except that the sword-piercing grooved can be telescopic, the rest of the grooved are in a fixed state and can only be applied to a single working condition.

[0004] The Chinese patent with the authorization announcement number of CN 214029292 U discloses a tape-passing and sword-piercing mechanism, including a tape-passing component and a sword-piercing component connected to the tape-passing component; the tape-passing component includes a tape-passing guide groove, and the tape-passing guide groove is installed on a full-automatic packing machine for steel coils; the sword-piercing component includes a sword-piercing guide groove, a slide rail member and a slider; the slide rail member is installed on the full-automatic packing machine for steel coils, the slider is slidably installed on the slide rail member, and the slider is mechanically connected to a power mechanism. The sword-piercing guide groove is installed on the slider, and one end of the sword-piercing guide groove is connected to one end of the tape-passing guide groove. After the sword-piercing guide groove extends out, the sword-piercing guide groove and the tape-passing guide groove can be communicated, and after the sword-piercing guide groove retracts, the connection is disconnected. Therefore, like the previous solution, this solution can also only be applied to a single working condition, and the application range is limited. Summary of the Invention

[0005] The object of the present invention is to provide a rotary corner structure and its grooved switching device to solve the problems existing in the above-mentioned prior art. By hinging the corner with grooves on the fixed seat and connecting a return spring between the two, the corner with grooves can not only communicate with the vertical fixed groove and the horizontal fixed groove, but also communicate with the vertical fixed groove and the sword-passing groove, so as to realize the conversion of various functions such as guiding the packing belt in the sword-passing groove and guiding the packing belt in the horizontal fixed groove. It can be used for packing goods with pallets and goods without pallets, and has strong versatility.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a rotary corner structure, including a fixed seat and a corner with grooves hinged on the fixed seat. One end of the corner with grooves is used to communicate with the vertical fixed groove, and the other end of the corner with grooves is used to communicate with the sword-passing groove or the horizontal fixed groove. The sword-passing groove is parallel to the horizontal fixed groove and is located above it. A return spring is also connected between the corner with grooves and the fixed seat; after the sword-passing groove extends from the fixed seat towards the corner with grooves, it can drive the corner with grooves to deflect and make it communicate with the sword-passing groove; after the sword-passing groove is retracted, the return spring can drive the corner with grooves to reset and make it communicate with the horizontal fixed groove.

[0008] Preferably, the corner with grooves includes a first corner seat hinged to the fixed seat and first flaps respectively connected to both sides of the first corner seat. The working surface of the first corner seat is a first arc surface, and the two first flaps on both sides and the first arc surface jointly enclose a first packing belt channel for conveying the packing belt.

[0009] Preferably, rollers are respectively arranged on both sides of the first corner seat, and the wheel surfaces of the rollers can contact the top surfaces on both sides in the width direction of the sword-passing groove.

[0010] Preferably, a buffer block is arranged on the surface of the fixed seat facing the first corner seat.

[0011] The present invention also provides a grooved switching device, including the rotary corner structure described above, a double-acting corner structure, and a sword-passing groove and a horizontal fixed groove located between the rotary corner structure and the double-acting corner structure. The double-acting corner structure includes a first port for communicating with the sword-passing groove and a second port for communicating with the horizontal fixed groove.

[0012] Preferably, the double-acting corner structure includes a second corner seat and second flap plates respectively connected to both sides of the second corner seat. The working surface of the second corner seat is a second arc surface. The second flap plates on both sides and the second arc surface jointly enclose a second packing belt channel for packing belt conveyance. Both the first port and the second port face the second arc surface.

[0013] Preferably, a sword-piercing guide groove is provided at the first port, and the sword-piercing guide groove has a V-shaped guiding opening.

[0014] Preferably, a baffle is provided at the second port, and the baffles are respectively located on both sides of the second corner seat.

[0015] Preferably, the second flap plate includes a fixing plate and a guiding plate connected to the fixing plate, and the fixing plate is elastically connected to the second corner seat.

[0016] Preferably, a fixed corner structure is provided at the position where the horizontal fixed belt groove communicates with the rotating corner structure. The fixed corner structure includes a third corner seat and third flap plates respectively connected to both sides of the third corner seat. The working surface of the third corner seat is a third arc surface. The third flap plates on both sides and the third arc surface jointly enclose a third packing belt channel for packing belt conveyance.

[0017] The present invention has achieved the following technical effects compared with the prior art:

[0018] (1) By hinging the corner belt groove on the fixed seat and connecting a return spring between the two, the corner belt groove of the present invention can not only communicate the vertical fixed belt groove and the horizontal fixed belt groove, but also communicate the vertical fixed belt groove and the sword-piercing belt groove, so as to realize the conversion of various functions such as guiding the packing belt by the sword-piercing belt groove and guiding the packing belt by the horizontal fixed belt groove, which can be applicable to the packing of goods with pallets and the packing of goods without pallets, and has strong versatility;

[0019] (2) Rollers are respectively arranged on both sides of the first corner seat of the present invention. Through the arrangement of the rollers, the sword-piercing belt groove will touch the rollers and drive the rollers to rotate during the extending process, so as to reduce the frictional loss of the sword-piercing belt groove on the first corner seat. In addition, the wheel surface of the roller can contact the top surfaces on both sides in the width direction of the sword-piercing belt groove to ensure the stable operation of the sword-piercing belt groove during the extending process and the recycling process;

[0020] (3) A buffer block is provided on one side of the fixed seat facing the first corner seat. When the first corner seat is pulled back to its original position by the return spring, the buffer block can be used to prevent the first corner seat from hitting the fixed seat, improving the flipping life of the first corner seat. At the same time, the buffer block can also serve as a limit block to limit the position of the first corner seat under the pulling force of the return spring and the blocking effect of the buffer block, so that the corner groove provided on the first corner seat can communicate with the vertical fixed groove and the horizontal fixed groove.

[0021] (4) The second arc surface of the double-acting corner of the present invention faces both the first port and the second port at the same time. When the packing belt passes through the first port or the second port, it will pass through the second arc surface. The same arc surface can realize the conversion of two paths without the need to set up additional conversion structures, which is simple and reliable.

[0022] (5) The rotating corner structure of the present invention is not directly connected to the horizontal fixed groove, but is connected through the fixed corner structure, which can reduce the setting length of the corner groove of the rotating corner structure and avoid the situation where the deflection angle is not conducive to the conveying of the packing belt when the corner groove communicates with the sword-passing groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 Schematic diagram of the rotating corner structure of the present invention;

[0025] Figure 2 For Figure 1 Explosion structure diagram;

[0026] Figure 3 Schematic diagram of the structure of the groove switching device of the present invention;

[0027] Figure 4 Schematic diagram of the double-acting corner structure of the present invention;

[0028] Figure 5 For Figure 4 Explosion structure diagram;

[0029] Figure 6 Schematic diagram of the structure after the horizontal fixed groove is connected;

[0030] Figure 7 For Figure 6 Enlarged structure diagram at position A in

[0031] Figure 8Schematic diagram of the structure after the sword-passing groove is connected

[0032] Figure 9 is Figure 8 Enlarged structure diagram at position B in

[0033] Figure 10 is Figure 8 Enlarged structure diagram at position C in

[0034] Wherein, 1 is a rotating corner structure; 11 is a fixed seat; 12 is a corner groove; 121 is a first corner seat; 122 is a first flap; 13 is a return spring; 14 is a roller; 15 is a buffer block; 2 is a vertical fixed groove; 3 is a sword-passing groove; 4 is a horizontal fixed groove; 5 is a double-acting corner structure; 51 is a second corner seat; 52 is a second flap; 521 is a fixing plate; 522 is a guide plate; 523 is a first port; 524 is a second port; 53 is a sword-passing guide groove; 54 is a baffle; 55 is a connecting plate; 6 is a fixed corner structure; 61 is a third corner seat; 62 is a third flap; 7 is a packing belt. Specific embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] The purpose of the present invention is to provide a rotating corner structure and its groove switching device to solve the problems existing in the prior art. By hinging the corner groove on the fixed seat and connecting a return spring between the two, the corner groove can not only connect the vertical fixed groove and the horizontal fixed groove, but also connect the vertical fixed groove and the sword-passing groove, so as to realize the conversion of multiple functions of the sword-passing groove and the horizontal fixed groove, and can be applicable to both the packaging of goods with pallets and the packaging of goods without pallets, with strong versatility.

[0037] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Such as Figures 1 to 3As shown in the figure, the present invention provides a rotary corner structure 1, which is used for guiding the packing belt 7 at the corner position of the belt groove assembly. It includes a fixed seat 11 and a corner belt groove 12 hinged on the fixed seat 11. The fixed seat 11 can be fixedly connected to the vertical fixed belt groove 2. The corner belt groove 12 is used for threading the packing belt 7 and guiding it, and can release the packing belt 7 when the belt is taken up and tightened. One end of the corner belt groove 12 (referring to the end where the packing belt 7 penetrates or exits) is used to communicate with the vertical fixed belt groove 2 on one side, and the other end of the corner belt groove 12 (referring to the other end where the packing belt 7 penetrates or exits) is used to communicate with the sword threading belt groove 3 or the horizontal fixed belt groove 4. Since the corner belt groove 12 is hinged on the fixed seat 11, when it rotates around the hinge point, the end of the corner belt groove 12 located at the hinge point rotates with a small amplitude, and the other end far from the hinge point rotates with a large amplitude. On the rotation trajectory of the other end, it can intersect with the sword threading belt groove 3 and the horizontal fixed belt groove 4 respectively to form a communication path for the packing belt 7. When the rotary corner structure 1 communicates with the sword threading belt groove 3, a channel for the packing belt 7 of the vertical fixed belt groove 2, the corner belt groove 12 and the sword threading belt groove 3 can be formed; when the rotary corner structure 1 communicates with the horizontal fixed belt groove 4, a channel for the packing belt 7 of the vertical fixed belt groove 2, the corner belt groove 12 and the horizontal fixed belt groove 4 can be formed. The sword threading belt groove 3 is parallel to the horizontal fixed belt groove 4 and is located above it. A return spring 13 is also connected between the corner belt groove 12 and the fixed seat 11. After the sword threading belt groove 3 extends from the fixed seat 11 towards the corner belt groove 12, it can drive the corner belt groove 12 to deflect and make it communicate with the sword threading belt groove 3; after the sword threading belt groove 3 retracts, the return spring 13 can drive the corner belt groove 12 to reset and make it communicate with the horizontal fixed belt groove 4. By hinging the corner belt groove 12 on the fixed seat 11 and connecting a return spring 13 between the two, the corner belt groove 12 of the present invention can not only communicate the vertical fixed belt groove 2 and the horizontal fixed belt groove 4, but also communicate the vertical fixed belt groove 2 and the sword threading belt groove 3, so as to realize the conversion of various functions such as guiding the packing belt 7 by the sword threading belt groove 3 and guiding the packing belt 7 by the horizontal fixed belt groove 4. It can be used for packing goods with pallets and packing goods without pallets, and has strong versatility.

[0039] The corner belt groove 12 may include a first corner seat 121 hinged to the fixed seat 11 and first flap plates 122 respectively connected to both sides of the first corner seat 121. The first corner seat 121 can drive the first flap plates 122 to deflect, realizing the change of the path of the packing belt 7. The working surface of the first corner seat 121 is a first arc surface, which is used to connect the vertical movement track and the horizontal movement track of the packing belt 7 into one. One end of the first corner seat 121 facing the sword-passing belt groove 3 and the horizontal fixed belt groove 4 is set in an acute angle form. One side of the acute angle is the first arc surface, and the other side is a bottom edge that can be parallel to the sword-passing belt groove 3. The setting of the acute angle form can facilitate the connection between the first arc surface and the sword-passing belt groove 3 or the horizontal fixed belt groove 4. The first flap plates 122 on both sides of the first corner seat 121 and the first arc surface on the first corner seat 121 together enclose a first packing belt channel for the conveyance of the packing belt 7. The cross-section of the first flap plate 122 is in an L shape. In the case of threading the belt, the first flap plate 122 is pressed on the first corner seat 121 by a spring. When the packing belt 7 is retracted between the two first flap plates 122, it can push the first flap plates 122 to both sides, making the gap between the first flap plates 122 expand, so that the packing belt 7 can smoothly expose from the expanded gap between the two first flap plates 122.

[0040] Rollers 14 may be respectively arranged on both sides of the first corner seat 121. Through the arrangement of the rollers 14, when the sword-passing belt groove 3 extends, it touches the rollers 14 instead of directly touching the first corner seat 121, turning the sliding friction into rolling friction. The inner diameter side of the roller 14 can be connected to the first corner seat 121 through a bearing, further reducing the resistance of rolling. The sword-passing belt groove 3 can drive the rollers 14 to rotate, thereby reducing the frictional loss of the sword-passing belt groove 3 on the first corner seat 121. In addition, the wheel surface of the roller 14 can contact the top surfaces on both sides in the width direction of the sword-passing belt groove 3, forming a double-sided support structure to ensure the stable operation of the sword-passing belt groove 3 during the extension and retraction processes.

[0041] On the surface of the fixed seat 11 facing the first corner seat 121, a buffer block 15 may also be provided. The buffer block 15 is made of elastic rubber or other soft materials and can buffer the impact force of the first corner seat 121. When the return spring 13 pulls the first corner seat 121 to reset, the buffer block 15 can be used to avoid the impact between the first corner seat 121 and the fixed seat 11, improving the flipping life of the first corner seat 121. At the same time, the buffer block 15 can also serve as a limit block. Under the pulling force of the return spring 13 and the blocking effect of the buffer block 15, the position of the first corner seat 121 is limited, so that the corner belt groove 12 provided on the first corner seat 121 can communicate with the vertical fixed belt groove 2 and the horizontal fixed belt groove 4.

[0042] As Figures 1 to 10As shown in the figure, the present invention further provides a grooved switching device, which may include the rotary corner structure 1 described above, and further includes a double-acting corner structure 5, a sword-threading belt groove 3 and a horizontal fixed belt groove 4 located between the rotary corner structure 1 and the double-acting corner structure 5. The sword-threading belt groove 3 is located above the horizontal fixed belt groove 4. When the sword-threading belt groove 3 communicates with the double-acting corner structure 5 and the rotary corner structure 1, the rotary corner structure 1 is in an upwardly deflected position; when the horizontal fixed belt groove 4 communicates with the double-acting corner structure 5 and the rotary corner structure 1, the rotary corner structure 1 is in a downwardly deflected position. Since the vertical positions of the sword-threading belt groove 3 and the horizontal fixed belt groove 4 are different, the double-acting corner structure 5 requires two communication port positions for communicating with the sword-threading belt groove 3 and the horizontal fixed belt groove 4 respectively. Therefore, the double-acting corner structure 5 includes a first port 523 for communicating with the sword-threading belt groove 3 and a second port 524 for communicating with the horizontal fixed belt groove 4.

[0043] Further, referring to Figure 4 and Figure 5 As shown in the figure, the double-acting corner structure 5 may include a second corner seat 51 and second flap plates 52 respectively connected to both sides of the second corner seat 51. Among them, the second corner seat 51 can be directly used as a fixed structure to be connected to another vertical fixed belt groove 2 and / or to the horizontal fixed belt groove 4. When connected to the horizontal fixed belt groove 4, a connecting plate can be provided at the lower part of the second corner seat 51 for connection through the connecting plate 51. The connecting plate 51 includes a horizontal section and a vertical section connected to each other. The horizontal section extends to the lower part of the horizontal fixed belt groove 4, and the extended part is provided with mounting holes, which can be used to mount a vertical support rod. By adjusting the vertical support position on the support rod, it is convenient to adjust the height relationship between the horizontal fixed belt groove 4 and the double-acting corner structure 5, that is, it is convenient to adjust the height relationship between the horizontal fixed belt groove 4 and the second port 524, and thus an accurate communication path for guiding the packing belt 7 can be formed. In the case of threading the belt, the second flap plates 52 are pressed on the second corner seat 51 by springs. When there is a packing belt 7 taking up the belt between the two second flap plates 52, the second flap plates 52 can be pushed open to both sides, so that the gap between the second flap plates 52 is enlarged, and thus the packing belt 7 can smoothly emerge from the enlarged gap between the two second flap plates 52. The working surface of the second corner seat 51 is a second arc surface. The second flap plates 52 on both sides and the second arc surface together enclose a second packing belt channel for the conveyance of the packing belt 7. The first port 523 and the second port 524 both face the second arc surface. That is to say, when the packing belt 7 passes through the first port 523 or the second port 524, it will pass through the second arc surface. Therefore, the same arc surface can realize the conversion of two paths, and no additional conversion structure needs to be provided, which is simple and reliable.

[0044] At the first port 523, a sword threading guide groove 53 may also be provided. The sword threading guide groove 53 has a V-shaped guiding opening. When the sword threading belt groove 3 reaches the sword threading guide groove 53, it will first enter the V-shaped guiding opening, which is convenient for determining and restricting the arrival position, avoiding the deviation of the sword threading belt groove 3. The rear section of the sword threading guide groove 53 is a straight section, forming an accurate guide for the sword threading belt groove 3, and then accurately connecting the sword threading belt groove 3 with the vertical fixing belt groove 2 on the other side. Another guide groove may be provided between the sword threading guide groove 53 and the second corner seat 51. This guide groove has a V-shaped opening for guiding the packing belt 7.

[0045] At the second port 524, a baffle 54 may be provided. The baffle 54 is respectively located on both sides of the second corner seat 51 for guiding and restricting the packing belt 7 passing through the second port 524.

[0046] The second flap 52 may adopt a structure similar to that of the first flap 122, or may adopt other structures. For example, it includes a fixing plate 521 and a guiding plate 522 connected to the fixing plate 521. The fixing plate 521 is used to connect the spring pressing structure, that is, the fixing plate 521 is elastically connected to the second corner seat 51. The guiding plate 522 has a structure with an L-shaped cross-section. After the fixing plate 521 and the guiding plate 522 are connected as a whole, an integral flap structure is formed. The split setting method of the second flap 52 can flexibly set the respective structures of the guiding plate 522 and the fixing plate 521. The fixing plate 521 can be made with a larger area to cover a larger area, and the setting position and shape of the guiding plate 522 can better cooperate with the second arc surface of the second corner seat 51.

[0047] At the position where the horizontal fixing belt groove 4 is connected to the rotating corner structure 1, a fixed corner structure 6 may also be provided. The fixed corner structure 6 can be fixedly installed on the horizontal fixing belt groove 4. At this time, the rotating corner structure 1 is not directly connected to the horizontal fixing belt groove 4, but is connected through the fixed corner structure 6, which can reduce the setting length of the corner belt groove 12 of the rotating corner structure 1 and avoid the situation where the deflection angle is not conducive to the conveying of the packing belt 7 when the corner belt groove 12 is connected to the sword threading belt groove 3. Specifically, the fixed corner structure 6 may include a third corner seat 61 and third flaps 62 respectively connected to both sides of the third corner seat 61. The working surface of the third corner seat 61 is a third arc surface. The third flaps 62 on both sides and the third arc surface jointly enclose a third packing belt passage for the conveying of the packing belt 7. In the case of threading the belt, the third flaps 62 are pressed on the third corner seat 61 by springs. When there is a packing belt 7 taking up the belt between the two third flaps 62, it can push the third flaps 62 to both sides, making the gap between the third flaps 62 expand, so that the packing belt 7 can smoothly emerge from the expanded gap between the two third flaps 62.

[0048] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A rotary corner structure, characterized in that: It includes a fixed seat and a corner belt groove hinged to the fixed seat. One end of the corner belt groove is used to communicate with a vertical fixed belt groove, and the other end of the corner belt groove is used to communicate with a sword-passing belt groove or a horizontal fixed belt groove. The sword-passing belt groove is parallel to the horizontal fixed belt groove and is located above it. A return spring is also connected between the corner belt groove and the fixed seat. After the sword-passing belt groove extends from the fixed seat towards the corner belt groove, it can drive the corner belt groove to deflect and make it communicate with the sword-passing belt groove. After the sword-passing belt groove is retracted, the return spring can drive the corner belt groove to reset and make it communicate with the horizontal fixed belt groove. The corner belt groove includes a first corner seat hinged to the fixed seat and first flap plates respectively connected to both sides of the first corner seat. The working surface of the first corner seat is a first arc surface. The two first flap plates on both sides and the first arc surface jointly enclose a first packing belt channel for packing belt conveyance. One end of the first corner seat facing the sword-passing belt groove and the horizontal fixed belt groove is set in an acute angle form. The cross-section of the first flap plate is L-shaped. In the case of threading the belt, the first flap plate is pressed on the first corner seat by a spring. When there is a packing belt taking in the belt between the two first flap plates, it can push the first flap plates to both sides, making the gap between the first flap plates expand, so that the packing belt can smoothly expose from the expanded gap between the two first flap plates.

2. The rotary corner structure according to claim 1, characterized in that: Rollers are respectively arranged on both sides of the first corner seat, and the wheel surfaces of the rollers can contact the top surfaces on both sides in the width direction of the sword-passing belt groove.

3. The rotary corner structure according to claim 2, characterized in that: A buffer block is arranged on the surface of the fixed seat facing the first corner seat.

4. A grooved switching device, characterized in that: It includes the rotary corner structure, the double-acting corner structure described in any one of claims 1-3, and the sword-passing belt groove and the horizontal fixed belt groove located between the rotary corner structure and the double-acting corner structure. The double-acting corner structure includes a first port for communicating with the sword-passing belt groove and a second port for communicating with the horizontal fixed belt groove.

5. The grooved switching device according to claim 4, characterized in that: The double-acting corner structure includes a second corner seat and second flap plates respectively connected to both sides of the second corner seat. The working surface of the second corner seat is a second arc surface. The two second flap plates on both sides and the second arc surface jointly enclose a second packing belt channel for packing belt conveyance. Both the first port and the second port face the second arc surface.

6. The grooved switching device according to claim 5, characterized in that: A sword-passing guide groove is arranged at the first port, and the sword-passing guide groove has a V-shaped guiding opening.

7. The grooved switching device according to claim 5 or 6, characterized in that: A baffle is arranged at the second port, and the baffles are respectively located on both sides of the second corner seat.

8. The grooved switching device according to claim 7, characterized in that: The second flap plate includes a fixing plate and a guiding plate connected to the fixing plate, and the fixing plate is elastically connected to the second corner seat.

9. The grooved switching device according to claim 7, characterized in that: A fixed corner structure is arranged at the position where the horizontal fixed belt groove communicates with the rotary corner structure. The fixed corner structure includes a third corner seat and third flap plates respectively connected to both sides of the third corner seat. The working surface of the third corner seat is a third arc surface. The two third flap plates on both sides and the third arc surface jointly enclose a third packing belt channel for packing belt conveyance.

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