Material belt tensioning mechanism

Abstract

The utility model relates to the technical field of packaging equipment, in particular to a material belt tensioning mechanism which comprises a machine frame, the machine frame comprises two vertical plates arranged in a spaced mode, a belt conveying roller set and a belt winding roller set are arranged between the two vertical plates, the belt conveying roller set is arranged below the belt winding roller set relative to the belt winding roller set, and the belt conveying roller set is used for driving a material belt winding drum to rotate so that a material belt can be pulled out. The belt winding roller set is used for winding a material belt from the belt conveying roller set and provided with a gravity tensioning roller and a rotating shaft, the rotating shaft is rotationally connected to the vertical plate, the two ends of the gravity tensioning roller are connected to the rotating shaft through a long-strip-shaped connecting piece respectively, the gravity tensioning roller ascends and descends by swinging around the rotating shaft, and the lower side of the gravity tensioning roller is used for winding the material belt. And the gravity tensioning roller selectively ascends and descends under the combined action of gravity and the material belt, so that the gravity tensioning roller is pressed on the material belt under the action of gravity, and the material belt is tensioned. According to the utility model, the material belt is tensioned under the combined action of gravity and the material belt, so that the whole tensioning structure is simpler, and the tightness of the material belt can be adjusted more flexibly.

Description

TECHNICAL FIELD

[0001] The utility model relates to packing equipment technical field, concretely relates to a material belt tensioning mechanism. BACKGROUND

[0002] The film packing bag is usually long strip material belt of head to tail before using, and the material belt is wound into the reel shape, in the automatic packing equipment, generally through the cooperation of the bag feeding device and the bag pulling device to pull the end of the material belt to pull out the material belt and gradually supply the packing bag to the packing station. In order to facilitate cutting packing bag or make the length of packing bag pulled out each time equal, the packing bag should be kept in the state of being tensioned in the process of being pulled out, so the tensioning mechanism is usually arranged to tension the film. In the prior art, the tensioning mode of the material belt is complex, it is difficult to adjust the amplitude of the material belt tensioning, which leads to the mismatch between the degree of material belt tensioning and the packing bag supply speed. SUMMARY

[0003] The utility model aims at providing a material belt tensioning mechanism to solve the above-mentioned existing problems of the prior art, such as complex tensioning mode of the material belt, and difficulty in matching the degree of material belt tensioning with the packing bag supply speed.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a material belt tensioning mechanism, comprising a rack, the rack comprises two vertically arranged vertical plates, a belt feeding roller set and a belt winding roller set are arranged between the two vertical plates, the belt feeding roller set is arranged below the belt winding roller set, the belt feeding roller set is used to drive the reel of the material belt to rotate to pull out the material belt, the belt winding roller set is used to wind the material belt from the belt feeding roller set, the belt winding roller set is provided with a gravity tensioning roller and a rotating shaft, the rotating shaft is rotatably connected to the vertical plate, the two ends of the gravity tensioning roller are connected to the rotating shaft through a long strip connecting piece and are lifted and lowered by swinging around the rotating shaft, the lower side of the gravity tensioning roller is used to wind the material belt, and the gravity tensioning roller selectively lifts and lowers under the joint action of gravity and the material belt, so that the gravity tensioning roller presses the material belt under the action of gravity to tension the material belt.

[0005] In one embodiment, the gravity tensioning roller comprises an inner roller and an outer roller coaxially connected through a bearing, the outer roller is used to wind the material belt and rotate around the inner roller as the material belt is pulled out, and the two ends of the inner roller are connected to the rotating shaft through the long strip connecting piece, so that the inner roller drives the outer roller to swing around the rotating shaft.

[0006] In one embodiment, the gravity tensioning roller has two, the two gravity tensioning rollers are arranged along the length direction of the long strip connecting piece, and one end of the two gravity tensioning rollers is connected to the same long strip connecting piece.

[0007] In one embodiment, the winding roller set comprises a plurality of reversing rollers for winding the material tape and changing the direction of the material tape pulling movement, and one reversing roller is arranged between the two gravity tension rollers.

[0008] In one embodiment, each end of the rotating shaft is rotatably connected to one of the vertical plates through a bearing, and the long strip-shaped connecting members are long strip-shaped plates, and the material tape is arranged between the two long strip-shaped plates.

[0009] In one embodiment, a detection through slot extending in the up-down direction is arranged on the vertical plate, and one detection sensor is arranged at each end of the detection through slot, the detection through slot is located in the area swept by the long strip-shaped connecting member during the lifting of the gravity tension roller, and the detection sensor is used to detect whether the long strip-shaped connecting member moves to the two ends of the detection through slot.

[0010] In one embodiment, the detection sensor is a photoelectric sensor.

[0011] In one embodiment, the tape feeding roller set comprises three tape feeding rollers, two first tape feeding rollers arranged below and one second tape feeding roller arranged above, the two first tape feeding rollers are arranged at intervals to support the material tape reel, the second tape feeding roller is arranged above to wind the material tape pulled out from the material tape reel, the second tape feeding roller is drivingly connected to a tape feeding driving member, the movement of the material tape is driven by the rotation of the second tape feeding roller, and the tape feeding speed is adjusted according to the position of the long strip-shaped connecting member detected by the detection sensor.

[0012] In one embodiment, the two first tape feeding rollers and the second tape feeding roller are drivingly connected through a belt transmission assembly, and the first tape feeding roller and the second tape feeding roller are synchronously rotatably connected with equal linear speeds.

[0013] In one embodiment, a tape pressing roller is arranged above the second tape feeding roller, the tape pressing roller is swingably connected to a tape pressing shaft, both ends of the tape pressing shaft are rotatably connected to the vertical plates, the circumferential outer surface of the tape pressing roller is provided with a plurality of needle structures for inserting the second tape feeding roller and the material tape between the tape pressing roller and the second tape feeding roller.

[0014] The utility model discloses beneficial effect is: the utility model discloses through setting up gravity tensioning roller, the material band is around setting in the downside of gravity tensioning roller, when the material band is too loose when the tape feeding speed is too fast, and gravity tensioning roller is under the action of gravity and makes the material band stress tension when the tape feeding speed is too slow, and gravity tensioning roller is under the action of the material band tension and makes the material band relax, thereby the tension degree of material band is dynamically adjusted. Secondly, the mode that gravity and material band jointly act to tension material band, the structure of whole tension structure is simpler, and it is more flexible to the material band tightness adjustment. Finally, set up detection sensor and through slot to detect the position of long strip connecting piece, indirectly detect whether gravity tensioning roller moves to the upper and lower limit position, and accordingly control tape feeding drive piece to adjust the movement speed of material band, namely tape feeding speed. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the perspective view of the utility model embodiment.

[0016] Figure 2 It is the front view of the utility model embodiment.

[0017] Figure 3 It is the right view of the utility model embodiment.

[0018] Figure 4 It is the perspective view of the utility model embodiment under the condition of installing material band winding drum.

[0019] Figure 5 It is the front view of the utility model embodiment under the condition of installing material band winding drum.

[0020] Figure 6 It is Figure 5 A-A section view of the utility model embodiment, and the dotted line in the drawing indicates material band.

[0021] Figure 7 It is the explosion view of the gravity tensioning roller structure of the utility model embodiment.

[0022] Wherein: 1 frame, 11 vertical board, 110 detection through slot, 2 tape feeding roller group, 21 tape feeding roller, 211 first tape feeding roller, 212 second tape feeding roller, 22 tape feeding drive piece, 23 belt transmission assembly, 24 pressure belt roller, 241 needle structure, 25 pressure belt shaft, 3 winding roller group, 31 gravity tensioning roller, 311 inner roller, 312 outer roller, 313 bearing rolls, 32 rotating shaft, 33 long strip connecting piece, 34 reversing roller, 4 detection sensor;

[0023] 100 material band winding drum, 101 material band. DETAILED DESCRIPTION

[0024] To further illustrate the embodiments, the present application provides the accompanying drawings. These drawings are part of the present application disclosure, which mainly serves to illustrate the embodiments, and can be combined with the related description of the specification to explain the operating principle of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementations and the advantages of the present application. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] Reference Figures 1 to 6 As shown in the drawings, the present application discloses a material belt tensioning mechanism, which comprises a rack 1, the rack 1 comprises two vertically arranged vertical plates 11, a belt feeding roller set 2 and a belt winding roller set 3 are arranged between the two vertical plates 11, the belt feeding roller set 2 is arranged below the belt winding roller set 3, the belt feeding roller set 2 is used to drive the material belt reel 100 to rotate so that the material belt 101 is pulled out, the belt winding roller set 3 is used to wind the material belt 101 from the belt feeding roller set 2, the belt winding roller set 3 is provided with a gravity tensioning roller 31 and a rotating shaft 32, the rotating shaft 32 is rotatably connected to the vertical plate 11, the gravity tensioning roller 31 is connected to the rotating shaft 32 through a long strip-shaped connecting piece 33 at both ends and is lifted and lowered by swinging around the rotating shaft 32, the lower side of the gravity tensioning roller 31 is used to wind the material belt 101, the gravity tensioning roller 31 selectively rises and falls under the joint action of gravity and the material belt 101, so that the gravity tensioning roller 31 is pressed on the material belt 101 under the action of gravity to tension the material belt 101.

[0026] The gravity tensioning roller 31, the rotating shaft 32 and the long strip-shaped connecting piece 33 form a rotating structure, more specifically, the gravity tensioning roller 31 swings around the rotating shaft 32 with the long strip-shaped connecting piece 33 as the radius, and the gravity tensioning roller 31 rises and falls with its swinging. Since the material belt 101 is wound around the lower side of the gravity tensioning roller 31, the tensioned material belt 101 serves to support the gravity tensioning roller 31, when the belt feeding speed is too fast (i.e. the speed of the material belt output is greater than the demand of the rear-end packaging device), the material belt is too loose, the gravity tensioning roller 31 is lowered under the action of gravity to tension the material belt 101; when the belt feeding speed is too slow, the material belt is too tight, the gravity tensioning roller 31 is raised under the action of the material belt tension to relax the material belt, thereby dynamically adjusting the tensioning degree of the material belt 101. Secondly, the way of tensioning the material belt by the joint action of gravity and the material belt, the structure of the whole tensioning structure is simpler, and the adjustment of the material belt tension is more flexible.

[0027] Reference Figure 7As shown, the gravity tension roller 31 comprises an inner roller 311 and an outer roller 312 coaxially connected through a rolling bearing 313, the outer roller 312 is used to wrap the material belt 101 and rotate around the inner roller 311 as the material belt 101 is pulled out, the inner roller 311 is connected to the rotating shaft 32 through the long strip-shaped connecting piece 33 at both ends, so that the inner roller 311 drives the outer roller 312 to swing around the rotating shaft 32. The gravity tension roller 31 of the embodiment has two, the two gravity tension rollers 31 are arranged in the length direction of the long strip-shaped connecting piece 33, and one end of the two gravity tension rollers 31 is connected to the same long strip-shaped connecting piece 33. By arranging two gravity tension rollers 31, and connecting the two gravity tension rollers 31 to the same long strip-shaped connecting piece 33, that is, the two gravity tension rollers 31 are synchronous swing, the material belt 101 is wound on the two gravity tension rollers 31 in turn, so that the material belt 101 is subjected to greater tension, which is beneficial to further tension the material belt 101, and the material belt 101 is output more stably.

[0028] Referring to Figures 1 to 6 As shown, the winding roller set 3 further comprises a plurality of reversing rollers 34, the reversing rollers 34 are used to wrap the material belt 101 and change the pulling-out movement direction of the material belt 101, and one reversing roller 34 is arranged between the two gravity tension rollers 31. The cooperation of the gravity tension roller 31 and the reversing roller 34 can prolong the length of the material belt 101 wound on the winding roller set 3, and under the condition that the whole material belt tensioning mechanism has limited height, prolonging the length of the material belt 101 wound on the winding roller set 3 can increase the tension adjustment space of the material belt 101, so that the tension adjustment of the material belt 101 is easier.

[0029] If only relying on the combined action of gravity and the material belt to tension the material belt, a situation may occur that the belt feeding speed is continuously too fast or too slow, the gravity tension roller 31 continuously rises or falls and collides with other parts, causing the equipment to be unable to work normally, therefore, the utility model further provides a belt feeding speed adjusting structure. The specific structure of the belt feeding speed adjusting structure is as follows:

[0030] Each end of the rotating shaft 32 is rotatably connected to a vertical plate 11 through a bearing, and the long strip-shaped connecting piece 33 is a long strip-shaped plate, and the material belt 101 is arranged between the two long strip-shaped plates. A detection through slot 110 extending in the upward and downward direction is formed in the vertical plate 11, and a detection sensor 4 is arranged at each end of the detection through slot 110, and the detection through slot 110 is located in the region swept by the long strip-shaped connecting piece 33 during the lifting process of the gravity tension roller 31, and the detection sensor 4 is used to detect whether the long strip-shaped connecting piece 33 moves to both ends of the detection through slot 101.

[0031] The detection sensor 4 in this embodiment is a photoelectric sensor, and the movement of the long strip-shaped connecting member 33 to the position where the detection sensor 4 is located is determined by covering the photoelectric sensor with the long strip-shaped connecting member 33, and then it is determined whether the long strip-shaped connecting member 33 moves to the two ends of the detection through slot 101. In other embodiments, the detection sensor 4 can also be an electromagnetic sensor such as a Hall element, and a magnetic member capable of being detected by the Hall element should be provided on the long strip-shaped connecting member 33 accordingly.

[0032] The tape feeding roller set 2 includes three tape feeding rollers 21, which are two first tape feeding rollers 211 located below and one second tape feeding roller 212 located above, the two first tape feeding rollers 211 are arranged at intervals for supporting the tape roll 100, and the second tape feeding roller 212 is arranged above for winding the tape 101 pulled out from the tape roll 100. The second tape feeding roller 212 is drivingly connected to a tape feeding driving member 22, and the movement of the tape 101 is driven by the rotation of the second tape feeding roller 212. The tape feeding driving member 22 adjusts the tape feeding speed according to the position of the long strip-shaped connecting member 33 detected by the detection sensor 4. When the detection sensor 4 detects that the long strip-shaped connecting member 33 moves to the upper end of the detection through slot 101, it indicates that the tape feeding speed of the tape 101 is too slow at this time, and the rotation speed of the second tape feeding roller 212 is adjusted by the tape feeding driving member 22 to increase the tape feeding speed, so that the tape 101 is loosened. The gravity tensioning roller 31 is lowered under the action of the loosened tape 101 and gravity, so that the tape 101 is tensioned; when the detection sensor 4 detects that the long strip-shaped connecting member 33 moves to the lower end of the detection through slot 101, it indicates that the tape feeding speed of the tape 101 is too fast at this time, and the rotation speed of the second tape feeding roller 212 is adjusted by the tape feeding driving member 22 to decrease the tape feeding speed, so that the tape 101 is tensioned. The gravity tensioning roller 31 is raised under the action of the tensioned tape 101 and gravity, so that the tape 101 is loosened. By this adjustment mode, the tape feeding speed is dynamically adjusted, which also limits the swing of the gravity tensioning roller 31 to prevent interference with other parts and affect the supply of the tape 101, and ensures the normal use of the packaging equipment.

[0033] The tape feeding roller 21, the tape feeding driving member 22, the belt transmission assembly 23, the long strip-shaped connecting member 33, the detection through slot 101, and the detection sensor 4 form a tape feeding speed adjusting structure in cooperation.

[0034] In order to make the rotation of the material belt reel 100 more smooth and the resistance of the material belt 101 output smaller, the first belt roller 211 and the second belt roller 212 are connected by the belt transmission assembly 23, and the first belt roller 211 and the second belt roller 212 are connected in synchronous rotation with equal linear speeds. The linear speeds of the first belt roller 211 and the second belt roller 212 are equal to the speed of the material belt 101 pulled out from the material belt reel 100. The belt driving element 22 of the embodiment is a motor, and the output shaft of the motor is connected to the first belt roller 211 and the second belt roller 212 through the belt transmission assembly 23. When it is needed to increase the belt speed, the rotation speed of the motor is increased to drive the first belt roller 211 and the second belt roller 212 to rotate at a higher speed, thereby increasing the output speed of the material belt 101. Correspondingly, when it is needed to decrease the belt speed, the rotation speed of the motor is decreased to drive the first belt roller 211 and the second belt roller 212 to rotate at a lower speed, thereby decreasing the output speed of the material belt 101.

[0035] In order to make the second belt roller 212 rotate to actually drive the material belt 101 to move, the upper portion of the second belt roller 212 is provided with a belt pressing roller 24, the belt pressing roller 24 is swingably connected to a belt pressing shaft 25, the two ends of the belt pressing shaft 25 are respectively rotatably connected to the vertical plate 11, and the circumferential outer surface of the belt pressing roller 24 is provided with a plurality of needle structures 241 for inserting into the second belt roller 212 and the material belt 101 between the belt pressing roller 24 and the second belt roller 212. The needle structures 241 are connected to the belt pressing roller 24 through a sleeve ring 242 and rotate synchronously with the belt pressing roller 24.

[0036] The insertion of the needle structures 241 into the second belt roller 212 and the material belt 101 can make the inserted portions relatively fixed, so that the material belt 101 can rotate synchronously with the second belt roller 212 and move with the rotation of the second belt roller 212. In addition, the needle structures 241 can also pierce the material belt 101 to facilitate the subsequent evacuation of the gas in the packaging bag during the vacuumization process after the packaging is sealed, which is beneficial to the close adhesion of the packaging bag to the surface of the packaged object. In order to make the needle structures 241 inserted into the second belt roller 212, the circumferential outer surface of the second belt roller 212 is provided with a recess 2121, of course, the outer surface of the second belt roller 212 can also be provided with a flat surface structure instead of the recess, and the end of the needle structure 241 abutting against the surface of the second belt roller 212 can also have the effect of relatively fixing the second belt roller 212 and the material belt 101.

[0037] Although the present application is specifically shown and described in connection with the preferred embodiments, those skilled in the art should understand that the remaining unexplained parts are prior art, and various changes made to the present application in form and details without departing from the spirit and scope of the present application defined in the appended claims, all fall within the protection scope of the present application.

Claims

1. A strip tensioning mechanism, characterized by: The application relates to a tape feeding device, which comprises a frame, the frame comprising two vertically arranged vertical plates, a tape feeding roller set and a tape winding roller set being arranged between the two vertical plates, the tape feeding roller set being arranged below the tape winding roller set, the tape feeding roller set being used to drive a tape roll to rotate so that the tape is pulled out, the tape winding roller set being used to wind the tape from the tape feeding roller set, the tape winding roller set being provided with a gravity tension roller and a rotating shaft, the rotating shaft being rotatably connected to the vertical plate, the two ends of the gravity tension roller being connected to the rotating shaft through a long strip-shaped connecting piece and being lifted and lowered by swinging around the rotating shaft, the lower side of the gravity tension roller being used to wind the tape, the gravity tension roller being selectively lifted and lowered under the joint action of gravity and the tape, so that the gravity tension roller is pressed on the tape under the action of gravity and the tape is tensioned.

2. A web tensioning mechanism according to claim 1, characterized in that: The gravity tension roller comprises an inner roller and an outer roller which are coaxially connected through a bearing, the outer roller being used to wind the tape and rotate around the inner roller as the tape is pulled out, the two ends of the inner roller being connected to the rotating shaft through the long strip-shaped connecting piece, so that the inner roller drives the outer roller to swing around the rotating shaft.

3. A web tensioning mechanism according to claim 2, characterized in that: The gravity tension roller has two, the two gravity tension rollers being arranged along the length direction of the long strip-shaped connecting piece, and one end of the two gravity tension rollers being connected to the same long strip-shaped connecting piece.

4. A web tensioning mechanism according to claim 3, characterized in that: The tape winding roller set comprises a plurality of reversing rollers, the reversing rollers being used to wind the tape and change the pulling direction of the tape, one reversing roller being arranged between the two gravity tension rollers.

5. The web tensioning mechanism of claim 1, wherein: Each end of the rotating shaft is rotatably connected to one vertical plate through a bearing, the long strip-shaped connecting piece is a long strip-shaped plate, and the tape is arranged between the two long strip-shaped plates.

6. A web tensioning mechanism according to claim 5, characterized in that: A detection through slot extending in the up-down direction is formed in the vertical plate, two detection sensors are arranged at the two ends of the detection through slot, the detection through slot is located in the region swept by the long strip-shaped connecting piece during the lifting of the gravity tension roller, and the detection sensors are used to detect whether the long strip-shaped connecting piece moves to the two ends of the detection through slot.

7. A web tensioning mechanism according to claim 6, characterized in that: The detection sensors are photoelectric sensors.

8. A web tensioning mechanism according to claim 6, characterized in that: The tape feeding roller set comprises three tape feeding rollers, the three tape feeding rollers being two first tape feeding rollers arranged below and one second tape feeding roller arranged above, the two first tape feeding rollers being arranged to support the tape roll, the second tape feeding roller being arranged above to wind the tape pulled out from the tape roll, the second tape feeding roller being drivingly connected to a tape driving element, the tape being driven to move by the rotation of the second tape feeding roller, and the tape driving element adjusting the tape speed according to the position of the long strip-shaped connecting piece detected by the detection sensors.

9. A web tensioning mechanism according to claim 8, characterized in that: The two first tape feeding rollers and the second tape feeding roller are drivingly connected through a belt driving assembly, and the first tape feeding rollers and the second tape feeding roller are synchronously rotatably connected with equal linear speeds.

10. The web tensioning mechanism of claim 8, wherein: The upper side of the second tape feeding roller is provided with a pressing roller, the pressing roller is swing connected to a pressing shaft, both ends of the pressing shaft are respectively rotationally connected to the vertical plates, and the circumferential outer surface of the pressing roller is provided with a plurality of needle structures for inserting the second tape feeding roller and the material tape between the pressing roller and the second tape feeding roller.

Images