Guide rail sliding assembly, conveying mechanism and packaging machine conveying mechanism

Abstract

The utility model belongs to the field of guide rail devices, and discloses a guide rail sliding assembly, a conveying mechanism and a packaging machine conveying mechanism. The guide rail component with the transition section is matched with the roller assembly which is uniquely designed, the first roller and the second roller of the roller assembly are matched with the inner rail face and the outer rail face of the guide rail assembly in an attached mode respectively, and therefore the roller assembly can be stably limited in the channel, high-speed conveying is facilitated, and the bearing capacity is better; and through the connection design of the transition section and the design of different widths of different guide rail sections, the situations of clamping stagnation, roller abrasion and the like when the rolling path assembly passes through the linear guide rail section and the arc guide rail section can be effectively avoided, and the sliding smoothness is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to guide rail device technical field, concretely relates to a guide rail sliding assembly, conveying mechanism and packaging machine conveying mechanism. BACKGROUND

[0002] The guide rail assembly is usually used for sliding guide, which mainly comprises a sliding part and a guide rail.

[0003] In the prior art, for the sliding structure through the rolling wheel and the guide rail rolling cooperation, most of them are through setting two groups of interval distribution rolling wheels on both sides of the guide rail, the rolling wheels on both sides are clamped and matched on both sides of the guide rail, and the rolling wheels bear the objects which need to be moved on them to realize the movement, and the guide rail usually comprises a straight line segment and an arc segment, when the sliding seat enters the arc segment from the straight line segment, the width change of the groove will cause the interference between the rolling wheel and the guide rail surface, even stuck, and there will be a gap mutation at the junction of the arc segment and the straight line segment, which will cause the impact and vibration, and the sliding is not smooth, and the wear of the rolling wheel is also more serious. SUMMARY

[0004] Therefore, the utility model discloses a guide rail sliding assembly, conveying mechanism and packaging machine conveying mechanism to solve the problem that the prior art guide rail sliding structure is not smooth when passing between the straight line segment and the arc segment.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] Firstly, a guide rail sliding assembly is provided, comprising:

[0007] A guide rail member with an inner rail surface and an outer rail surface, the inner rail surface and the outer rail surface are spaced to form a groove, the guide rail member comprises a straight line guide rail segment, an arc guide rail segment and a transition segment, the groove width of the arc guide rail segment is greater than that of the straight line guide rail segment, and the transition segment has a gradually changing groove width to connect the straight line guide rail segment and the arc guide rail segment;

[0008] A rolling wheel assembly matched in the groove of the guide rail member, the rolling wheel assembly comprises four rolling wheels distributed along the extension direction of the guide rail member, wherein the two rolling wheels on both sides are rolling wheels one, and the two rolling wheels in the middle are rolling wheels two;

[0009] Wherein, when the rolling wheel assembly is in the arc guide rail segment, the rolling wheels one are attached to the outer rail surface and have a gap with the inner rail surface, and the rolling wheels two are attached to the inner rail surface and have a gap with the outer rail surface;

[0010] When the roller assembly is in the linear guide rail segment, the first roller is attached to the outer rail surface and has a gap with the inner rail surface, and the second roller is attached to the inner rail surface and has a gap with the outer rail surface, or the first roller is attached to the inner rail surface and has a gap with the outer rail surface, and the second roller is attached to the outer rail surface and has a gap with the inner rail surface.

[0011] In a possible implementation, the outer rail surface of the transition segment comprises a curved surface segment with a gradually changing radius of curvature, and the inner rail surface of the transition segment is a straight line segment extending along the inner rail surface of the linear guide rail segment and being tangent to the end of the inner rail surface of the arc guide rail segment.

[0012] In a possible implementation, the inner rail surface and the outer rail surface of the guide rail member are both provided with guide grooves for cooperating with the rollers.

[0013] In a possible implementation, the guide grooves are trapezoidal grooves, and the wheel surfaces of the first rollers and the second rollers are provided with cooperating portions for abutting against the trapezoidal grooves.

[0014] In a possible implementation, the roller assembly further comprises a sliding member, the first rollers and the second rollers are rotationally connected to the sliding member, and the guide rail member further comprises a side edge surface perpendicular to the inner rail surface, and the sliding member is provided with a walking portion moving along the side edge surface.

[0015] In a possible implementation, when the roller assembly travels along the arc guide rail segment and the linear guide rail segment, the first rollers are all attached to the outer rail surface, and the second rollers are all attached to the inner rail surface, and the relationship between the roller assembly and the arc guide rail segment and the linear guide rail segment satisfies:

[0016]

[0017] When the roller assembly travels along the linear guide rail segment and the arc guide rail segment, the first rollers are switched from being attached to the inner rail surface of the linear guide rail segment to being attached to the outer rail surface of the arc guide rail segment, and the second rollers are switched from being attached to the inner rail surface of the linear guide rail segment to being attached to the outer rail surface of the arc guide rail segment, and the relationship between the roller assembly and the arc guide rail segment and the linear guide rail segment satisfies:

[0018]

[0019] wherein, D l is the groove width of the linear guide rail segment, R1 is the radius of the outer rail surface of the arc guide rail segment, r1 is the radius of the first roller, R2 is the radius of the inner rail surface of the arc guide rail segment, r2 is the radius of the second roller, L1 is the distance between the two roller shafts of the first rollers, and L2 is the distance between the two roller shafts of the second rollers.

[0020] In a second aspect, a conveying mechanism is also provided, comprising:

[0021] The guide rail sliding assembly according to any one of the preceding technical solutions.

[0022] A first carrier connected with the roller assembly.

[0023] The third aspect also provides a packaging machine conveying mechanism, characterized by comprising:

[0024] Two groups of guide rail sliding assemblies according to any one of the preceding technical solutions;

[0025] A packaging bag carrier connected between the roller assemblies of the two groups of guide rail sliding assemblies; and

[0026] A plurality of stations arranged circumferentially along the annular guide rail member, and the plurality of stations comprise one or more of a bag feeding station, a filling station, a heat sealing station and a discharging station.

[0027] Compared with the prior art, the packaging machine conveying mechanism has the following beneficial effects:

[0028] The guide rail sliding assembly has the following beneficial effects: the roller assembly can be kept limited and stable in the channel, so that the roller assembly can be conveniently conveyed at a high speed and has better load capacity; the transition section and the different widths of the different guide rail sections can effectively avoid the situations of jamming and wearing of the rollers when the roller assembly passes between the linear guide rail section and the arc guide rail section, and improve the smoothness of sliding.

[0029] The conveying mechanism can be used for reciprocating or circulating conveying of materials, and the materials can be carried by the carrier arranged on the roller assembly, so that the materials can be stably and smoothly conveyed during conveying, and the stability of conveying is improved.

[0030] The packaging machine conveying mechanism based on the guide rail sliding assembly can realize circumferential movement of the materials along the annular guide rail member, and the materials can pass through each station in the circumferential direction through the circumferential movement, so that the related processes of material packaging can be realized, and the accuracy of packaging can be improved through better conveying stability. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 FIG. 1 is a plan view of a guide rail sliding assembly;

[0032] Figure 2 FIG. 3 is a partial enlarged view of the transition section; Figure 1

[0033] Figure 3 FIG. 5 is an exploded view of a guide rail sliding assembly;

[0034] Figure 4 ​A schematic diagram of the principle of cooperation between a roller assembly and a channel of a guide rail sliding assembly in a cooperation mode;

[0035] Figure 5 A schematic diagram of the principle of cooperation between a roller assembly and a channel of a guide rail sliding assembly in another cooperation mode; Figure 4

[0036] Figure 6 A schematic diagram of the principle of cooperation between a roller assembly and a channel of a guide rail sliding assembly in another cooperation mode;

[0037] Figure 7 A schematic diagram of the principle of cooperation between a roller assembly and a channel of a guide rail sliding assembly in another cooperation mode; Figure 6

[0038] Figure 8 A schematic diagram of a first embodiment of a conveying mechanism;

[0039] Figure 9 A schematic diagram of a second embodiment of a conveying mechanism;

[0040] Figure 10 A schematic diagram of a second embodiment of a conveying mechanism; Figure 9

[0041] Figure 11 A schematic diagram of a second embodiment of a conveying mechanism; Figure 9

[0042] Figure 12 A schematic diagram of a second embodiment of a conveying mechanism; Figure 9

[0043] Figure 13 A schematic diagram of a second embodiment of a conveying mechanism; Figure 9

[0044] A schematic diagram of a second embodiment of a conveying mechanism; Figure 14

[0045] In the figure: 1 - guide rail member; 11 - straight rail section; 12 - arc rail section; 13 - outer rail surface; 14 - inner rail surface; 15 - channel; 16 - transition section; 161 - inner straight section; 162 - curved surface section; 17 - guide groove; 2 - roller assembly; 21 - roller one; 22 - roller two; 23 - sliding member; 24 - walking part; 25 - cooperation part; 3 - chain mechanism; 4 - packaging bag carrier. DETAILED DESCRIPTION

[0046] In order to make the technical personnel in the art better understand the technical scheme of the utility model, the utility model will be further described in detail below in combination with specific embodiments.

[0047] Please refer to​​​​​​Figures 1-7 As shown, the embodiment of the present application provides a guide rail sliding assembly, which comprises a guide rail member 1 and a roller assembly 2. The roller assembly 2 moves along the channel 15 formed by the guide rail member 1, and the guide rail member 1 provides sliding guide.

[0048] In the embodiment of the present application, the guide rail member 1 has an inner rail surface 14 and an outer rail surface 13, which are spaced apart to form a channel 15. The guide rail member 1 comprises a straight rail segment 11, an arc rail segment 12, and a transition segment 16. The channel 15 of the arc rail segment 12 has a width greater than that of the straight rail segment 11. The transition segment 16 has a gradually changing channel width to connect the straight rail segment and the arc rail segment. The overall shape of the guide rail member 1 is a circular path, which can be a long circular shape in the shape of a runway, or other circular paths formed by the combination of the straight rail segment 11, the arc rail segment 12, and the transition segment 16. The inner rail surface 14 refers to the rail surface on the inner side of the circular path, and the outer rail surface 13 refers to the rail surface on the outer side of the circular path. The roller assembly 2 is also fitted in the channel 15 of the guide rail member 1.

[0049] The guide rail member 1 can be a one-piece member and is formed with spaced-apart inner rail surfaces 14 and outer rail surfaces 13. Alternatively, the guide rail member 1 can be a split member, such as two strip-shaped guide rails spaced apart. In this case, the inner rail surfaces of the two strip-shaped guide rails can form the inner rail surfaces 14 and the outer rail surfaces 13 and the channel 15, respectively. That is, the structure can be various and is not limited. The guide rail member 1 mainly comprises the straight rail segment 11, the arc rail segment 12, and the transition segment 16. The transition segment 16 is arranged between the straight rail segment 11 and the arc rail segment 12 to transition. The channel 15 of the arc rail segment 12 has a width greater than that of the straight rail segment 11. The transition segment 16 mainly functions as a width transition, i.e., to transition and connect the straight rail segment 11 with a relatively narrow channel 15 width and the arc rail segment with a relatively wide channel 15 width. The transition segment 16 has a gradually changing channel width, which can allow the roller assembly 2 to have a larger space for attitude adjustment when passing through the transition segment 16, so as to meet the movement space requirement of the roller assembly 2 when entering the arc rail segment 12 from the straight rail segment 11. Thus, the problem of easy jamming or even being stuck due to sudden width change can be avoided, and the smoothness of passing can be improved.

[0050] The roller assembly 2 can include four rollers distributed along the extension direction of the guide rail member, wherein two rollers on the sides are roller one 21, and two rollers in the middle are roller two 22. The total number of rollers can be configured to three or four, and the two roller one 21 are staggered above and below the two roller two 22 in the extension direction of the channel 15, and can be limited and stabilized in the channel 15 by respectively fitting the inner rail surface 14 and the outer rail surface 13. Moreover, by providing four rollers, the four rollers can have better load capacity and facilitate high-speed sliding compared to providing three rollers.

[0051] Based on this, the roller one 21 and the roller two 22 of the roller assembly 2 and the inner rail surface 14 and the outer rail surface 13 of the channel 15 have the following matching modes:

[0052] The first matching mode, in combination with Figure 5 As shown, when the roller assembly 2 is in the arc rail segment 12, the roller one 21 fits the outer rail surface 13 and has a gap with the inner rail surface 14, and the roller two 22 fits the inner rail surface 14 and has a gap with the outer rail surface 13; when the roller assembly 2 is in the straight rail segment 11, the roller one 21 fits the outer rail surface 13 and has a gap with the inner rail surface 14, and the roller two 22 fits the inner rail surface 14 and has a gap with the outer rail surface 13.

[0053] In this matching mode, in combination with Figure 4 As shown, when the roller assembly 2 proceeds to the straight rail segment 11, the roller one 21 fits the outer rail surface 13, and the roller two 22 fits the inner rail surface 14; when the roller assembly 2 proceeds to the arc transition segment 16, the roller assembly of the roller assembly 2 will adjust the posture and rotate around the center of the arc rail segment and slide along the arc rail segment 12, and the transition segment 16 provides adjustment space for the roller assembly 2; when the roller assembly 2 is in the arc rail segment 12, the roller one 21 fits the outer rail surface 13 of the arc rail segment 12, and the roller two 22 fits the inner rail surface 14 of the arc rail segment 12, and thus moves along the arc rail segment 12. That is, in this matching mode, the roller one 21 and the roller two 22 always fit the preset rail surface when moving along the guide rail member 1.

[0054] The second matching mode, in combination with Figure 6 As shown, when the roller assembly 2 is in the arc rail segment 12, the roller one 21 fits the outer rail surface 13 and has a gap with the inner rail surface 14, and the roller two 22 fits the inner rail surface 14 and has a gap with the outer rail surface 13; when the roller assembly 2 is in the straight rail segment 11, the roller one 21 fits the inner rail surface 14 and has a gap with the outer rail surface 13, and the roller two 22 fits the outer rail surface 13 and has a gap with the inner rail surface 14.

[0055] In the matching mode, when the roller assembly 2 travels to the straight rail segment 11, the first roller 21 is attached to the inner rail surface 14, and the second roller 22 is attached to the outer rail surface 13. When the roller assembly 2 travels to the arc transition segment 16, the rollers of the roller assembly are adjusted in posture and rotate around the center of the arc rail segment and slide along the arc rail segment 12. The transition segment 16 provides adjustment space for the roller assembly 2 and continues to attach to the outer rail surface 13 and the inner rail surface 14 of the arc rail segment to move. When the roller assembly 2 travels along the arc rail segment 12, the first roller 21 moves along the outer rail surface 13 of the arc rail segment 12, and the second roller 22 moves along the inner rail surface 14 of the arc rail segment 12. That is, in the matching mode, the first roller 21 and the second roller 22 switch the rail surface to which they are attached during travel along different rail segments of the rail member 1. This is because the center track radius of the second roller 22 is smaller than that of the first roller 21 when it rotates around the center of the arc rail segment 12, so it is attached to the inner rail surface 14.

[0056] Both of the above-mentioned matching modes can achieve stable and high-speed sliding guidance. The specific configuration can be selected according to actual needs.

[0057] Through the above technical solution, the unique design of the roller assembly 2 matches the rail member 1 with the transition segment 16, so that the first roller 21 and the second roller 22 of the roller assembly 2 are respectively attached to the inner rail surface 14 and the outer rail surface 13 of the rail assembly. This can not only keep the roller assembly 2 limited and stable in the channel 15, but also facilitate high-speed conveying and have better load capacity. In addition, through the connection design of the transition segment 16 and the different width design of different rail segments, the situation of jamming and wearing of the rollers when the roller assembly travels between the straight rail segment 11 and the arc rail segment 12 can be effectively avoided, and the smoothness of sliding is improved.

[0058] In an embodiment, the outer rail surface 13 of the transition segment 16 includes a curved surface segment 162 with a gradually changing radius of curvature, and the inner rail surface of the transition segment 16 is a straight line segment 161 extending along the inner rail surface of the straight rail segment 11 and tangent to the end of the inner rail surface 14 of the arc rail segment 12.

[0059] In this way, the width of the channel 15 of the transition segment 16 is gradually changed, which can effectively connect the arc rail segment 12 and the straight rail segment 11 with inconsistent channel 15 widths, provide adjustment space for the roller assembly 2 when it passes through the transition segment 16, reduce the impact of sudden changes in curvature, and improve the stability and smoothness of sliding.

[0060] Further, the connection position of the curved section 162 and the outer rail surface 13 of the arc rail section 12 is arranged rearward relative to the connection position of the inner straight section 161 and the inner rail surface 14 of the arc rail section 12 in the direction from the linear rail section 11 to the arc rail section 12.

[0061] In this way, the rearwardly arranged transition connection position can be adapted to the arrangement of the roller assembly 2, and better provide a transition space for the posture adjustment of the roller assembly 2.

[0062] In order to improve the stability of the roller assembly 2 when moving along the inner rail surface 14 and the outer rail surface 13, further, the inner rail surface 14 and the outer rail surface 13 of the rail member are both provided with guide grooves 17 for cooperating with the rollers.

[0063] The arrangement of the guide grooves 17 can limit the roller assembly 2 during movement along the inner rail surface 14 and the outer rail surface 13, and provide a certain bearing support force, so that the roller assembly 2 is more stable and smooth during movement.

[0064] Specifically, the guide groove 17 is a trapezoidal groove, and the wheel surfaces of the first roller 21 and the second roller 22 are provided with cooperating portions 25 abutting against the trapezoidal groove. The cross section of the guide groove 17 is trapezoidal, also known as a trapezoidal groove, and correspondingly, the wheel surfaces of the first roller 21 and the second roller 22 are also provided with cooperating portions 25 of trapezoidal structure, so that the first roller 21 and the second roller 22 can have better support and stable contact, thereby achieving better sliding effect.

[0065] In the specific implementation process, the roller assembly 2 further includes a sliding member 23, the first roller 21 and the second roller 22 are rotatably connected to the sliding member 23, and the rail member 1 further includes a side edge surface perpendicular to the inner rail surface 14, and the sliding member 23 is provided with a walking portion 24 moving along the side edge surface. The sliding member 23 serves as the main part of the roller assembly 2, and the first roller 21 and the second roller 22 are rotatably connected to the sliding member 23 through the roller shaft, so as to form a whole sliding part, and then a carrier or other components can be arranged thereon to realize conveying. At the same time, the rail member 1 is preferably a groove type rail, and the two inner side surfaces of the groove type rail serve as the inner rail surface 14 and the outer rail surface 13 respectively, and the walking portion 24 is installed on the sliding member 23 and slidably cooperates with or rolls with the side edge of the rail member 1, so as to support the sliding member 23, and then part of the pressure on the sliding member 23 is transferred to the sliding support, thereby reducing the friction between the roller assembly 2 and the inner rail surface 14 and the outer rail surface 13, so that the sliding is more smooth. Specifically, the walking portion 24 can be a ball bearing.

[0066] Please refer to Figure 4 and Figure 5As shown, in the embodiments of the present application, when the roller assembly 2 travels along the arc rail segment 12 and the straight rail segment 11, the rollers one 21 all adhere to the outer rail surface 13, and the rollers two 22 all adhere to the inner rail surface 14. At this time, the relationship between the roller assembly 2 and the arc rail segment 12 and the straight rail segment 11 satisfies:

[0067] wherein, D l is the groove width of the straight rail segment, R1 is the radius of the outer rail surface of the arc rail segment, r1 is the radius of the roller one, R2 is the radius of the inner rail surface of the arc rail segment, r2 is the radius of the roller two, L1 is the distance between the two roller one shaft centers, and L2 is the distance between the two roller two shaft centers.

[0068] The formula defines the size matching relationship between the roller assembly 2 and the straight rail segment 11 and the arc rail segment 12 when the adhered rail surface does not change.

[0069] In combination Figure 6 and Figure 7 As shown, when the roller assembly 2 travels along the straight rail segment 11 and the arc rail segment 12, the rollers one 21 are switched from adhering to the inner rail surface 14 of the straight rail segment 11 to adhering to the outer rail surface 13 of the arc rail segment 12, and the rollers two 22 are switched from adhering to the inner rail surface 14 of the straight rail segment 11 to adhering to the outer rail surface 13 of the arc rail segment 12. At this time, the relationship between the roller assembly 2 and the arc rail segment 12 and the straight rail segment 11 satisfies:

[0070]

[0071] The formula defines the size matching relationship between the roller assembly 2 and the straight rail segment 11 and the arc rail segment 12 when the adhered surface changes.

[0072] At the same time, the groove 15 width of the arc rail segment 12 is greater than the groove 15 width of the straight rail segment 11, and the diameters of the rollers one 21 and the rollers two 22 are smaller than the groove 15 width of the straight rail segment.

[0073] In actual implementation, the rollers one and the rollers two adopt the same wheel diameter, and the distance between the roller one shaft center connecting line and the roller two shaft center connecting line can be selected and configured according to actual conditions and requirements.

[0074] The above formula can be used to conveniently calculate the related parameters, and the implementation can be more convenient.

[0075] Please refer to Figures 8-14 The embodiments of the present application also provide a conveying mechanism, which comprises the guide rail sliding assembly according to any one of the above technical solutions, and a first carrier connected with the roller assembly 2.

[0076] The conveying mechanism can be horizontally placed or vertically placed, and the specific configuration can be selected according to actual needs. The horizontal placement is that the plane of the annular path of the guide rail member 1 is along the horizontal direction, and the vertical placement is that the plane of the annular path of the guide rail member 1 is along the vertical direction. The first carrier is connected with the sliding piece 23 of the roller assembly 2, and the first carrier can move with the sliding of the roller assembly 2, thereby realizing the conveying of the materials.

[0077] In addition, the conveying mechanism can be provided with a driving mechanism to drive the plurality of roller assemblies 2 arranged on the guide rail member 1. The driving mechanism can be a chain mechanism 3 matched with the guide rail member 1, the chain mechanism 3 is connected with the sliding piece 23 of each roller assembly 2, and the chain mechanism 3 drives each roller assembly 2 to slide along the guide rail member 1. The driving mechanism can also be a screw propulsion mechanism, the sliding pieces 23 of each roller assembly 2 are sequentially connected, and each sliding piece 23 is provided with a transmission part. The transmission part is matched with a screw member of the screw propulsion mechanism. The rotation of the screw member drives the transmission part to move along the rotation axis of the screw member, thereby enabling the roller assembly 2 to move along the guide rail member 1, and the like.

[0078] Please refer to Figure 12 The embodiment of the present application also provides a packaging machine conveying mechanism, which comprises: two groups of guide rail sliding assemblies as described in any one of the above; a packaging bag carrier 4 connected between the roller assemblies 2 of the two groups of guide rail sliding assemblies; and a plurality of workstations arranged circumferentially along the annular guide rail member 1, wherein the plurality of workstations comprise one or more of a bag feeding workstation, a material loading workstation, a heat sealing workstation and a material dropping workstation.

[0079] The guide rail sliding assemblies are provided in two groups and are oppositely arranged at intervals. The two groups of guide rail sliding assemblies are connected through the packaging bag carrier 4. The two ends of the packaging bag carrier 4 with the bag clamping function are respectively connected to the sliding pieces 23 of the roller assemblies 2 on the same side. When the roller assemblies 2 slide along the guide rail member 1, the packaging bag carrier 4 can make a circular reciprocating motion in the circumferential direction. In this way, the related mechanisms of the plurality of workstations in the circumferential direction can be facilitated for packaging. For example, when the packaging bag carrier 4 moves to the bag feeding workstation, the bag feeding mechanism of the bag feeding workstation is used for feeding the bag. After the bag is fed, the packaging bag carrier 4 continues to rotate to the material loading workstation, and the material loading mechanism of the material loading workstation is used for loading the material. In this way, the above steps are repeated.

[0080] The above is only the preferred embodiment of the present application, and it should be pointed out that the above preferred embodiment should not be regarded as a limitation of the present application. The protection scope of the present application should be subject to the scope defined by the claims. For ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the spirit and scope of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A guide rail sliding assembly, characterized by, Comprising: A rail member having an inner rail surface and an outer rail surface, the inner rail surface and the outer rail surface being spaced to form a channel, the rail member comprising a linear rail segment, an arc rail segment, and a transition segment, the channel width of the arc rail segment being greater than the channel width of the linear rail segment, the transition segment having a gradually changing channel width to link the linear rail segment and the arc rail segment; and A roller assembly comprising four rollers distributed along the extension direction of the rail member, wherein the two rollers on the sides are roller one and the two rollers in the middle are roller two; Wherein, when the roller assembly is in the arc rail segment, the roller one is in contact with the outer rail surface and has a gap with the inner rail surface, and the roller two is in contact with the inner rail surface and has a gap with the outer rail surface; When the roller assembly is in the linear rail segment, the roller one is in contact with the outer rail surface and has a gap with the inner rail surface, and the roller two is in contact with the inner rail surface and has a gap with the outer rail surface, or the roller one is in contact with the inner rail surface and has a gap with the outer rail surface, and the roller two is in contact with the outer rail surface and has a gap with the inner rail surface.

2. A guide rail sliding assembly as claimed in claim 1, characterized in that The outer rail surface of the transition segment comprises a curved surface segment with a gradually changing radius of curvature, and the inner rail surface of the transition segment is a straight line segment extending along the inner rail surface of the linear rail segment and tangent to the end of the inner rail surface of the arc rail segment.

3. A guide rail sliding assembly as claimed in claim 1, characterized in that The inner rail surface and the outer rail surface of the rail member are both provided with guide grooves for cooperating with the rollers.

4. A guide rail sliding assembly as claimed in claim 3, characterized in that The guide groove is a trapezoidal groove, and the wheel surface of the roller one and the roller two is provided with a matching part in abutment with the trapezoidal groove.

5. A guide rail sliding assembly as claimed in claim 1, wherein, The roller assembly further comprises a sliding member, the roller one and the roller two are rotationally connected to the sliding member, and the rail member further comprises a side edge surface perpendicular to the inner rail surface, and the sliding member is provided with a walking part movable along the side edge surface.

6. A guide rail sliding assembly as claimed in claim 1, characterized in that When the roller assembly travels along the arc rail segment and the linear rail segment, the roller one is in contact with the outer rail surface, and the roller two is in contact with the inner rail surface, at this time, the relationship between the roller assembly and the arc rail segment and the linear rail segment satisfies: ； When the roller assembly travels along the linear rail segment and the arc rail segment, the roller one switches from being in contact with the inner rail surface of the linear rail segment to being in contact with the outer rail surface of the arc rail segment, and the roller two switches from being in contact with the inner rail surface of the linear rail segment to being in contact with the outer rail surface of the arc rail segment, at this time, the relationship between the roller assembly and the arc rail segment and the linear rail segment satisfies: ； Wherein, D_l is the channel width of the linear rail segment, R1 is the radius of the outer rail surface of the arc rail segment, r1 is the radius of the roller one, R2 is the radius of the inner rail surface of the arc rail segment, r2 is the radius of the roller two, L1 is the distance between the two roller one shaft centers, and L2 is the distance between the two roller two shaft centers.

7. A delivery mechanism characterized by, Comprising: The rail sliding assembly of any one of claims 1-6; A first carrier connected with the roller assembly.

8. A packaging machine conveying mechanism, characterized in that, Comprising: Two groups of rail sliding assemblies of any one of claims 1-6; A packaging bag carrier connected between the roller assemblies on the two groups of rail sliding assemblies; And A plurality of workstations arranged circumferentially along the annular rail member, and the plurality of workstations comprise one or more of a bag feeding workstation, a material loading workstation, a heat sealing workstation, and a material falling workstation.

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