Traction mechanism

Abstract

The utility model relates to the technical field of packing machines, and discloses a traction mechanism which comprises a base, a connecting seat, a turnover frame and a traction head, the connecting seat is arranged on the base in a sliding mode, a limiting belt is arranged on the base, the traction head is arranged in the turnover frame, a driving chain capable of actively stretching out and drawing back is arranged at the rear end of the traction head, and the traction head is arranged in the turnover frame. The rear end of the overturning frame is rotationally connected with the connecting base through a connecting shaft, the connecting shaft and the overturning frame rotate synchronously, a swing arm is fixedly arranged at the outer end of the connecting shaft, and a guide wheel eccentrically distributed with the connecting shaft is arranged on the swing arm; a guide wheel seat is fixedly arranged on the base, an arc-shaped supporting face extending from bottom to top is arranged on the guide wheel seat, and the guide wheel abuts against the arc-shaped supporting face. The turnover frame has the advantages of being stable in structure, smooth in turnover and not prone to clamping stagnation.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic strapping and packaging equipment, in particular to a traction mechanism. Background Art

[0002] In the packaging field, for items on pallets, the end of the strapping tape needs to be passed through the bottom of the pallet and then through the other end, and then the end of the strapping tape needs to be passed upward around the object, and then the strapping tape needs to be retracted from the top of the object to complete the strapping operation. Manual strapping is time-consuming and labor-intensive, so some existing strapping machines are usually equipped with automatic strapping mechanisms or strapping tape traction mechanisms. Since the strapping tape needs to be flipped 90 degrees and then pulled upward after passing through the pallet, the current strapping tape traction mechanism has poor stability. During the flipping process, the chain needs to provide a lot of power to the flipping frame to flip it, which makes it easy to get stuck during flipping. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model provides a traction mechanism with a stable structure, smoother turning and less prone to jamming.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A traction mechanism comprises a base, a connecting seat, a turning frame and a traction head, the connecting seat is slidably arranged on the base, the base is provided with a limiting belt, the traction head is arranged inside the turning frame, the rear end of the traction head is provided with an actively retractable driving chain, the rear end of the turning frame is rotatably connected with the connecting seat through a connecting shaft, the connecting shaft rotates synchronously with the turning frame, a swing arm is fixedly provided at the outer end of the connecting shaft, and a guide wheel is provided on the swing arm which is eccentrically distributed with the connecting shaft; a guide wheel seat is fixedly provided on the base, and an arc-shaped supporting surface extending from bottom to top is provided on the guide wheel seat, and the guide wheel abuts against the arc-shaped supporting surface; when the turning frame is in a horizontal state, the guide wheel is located at the lower end of the arc-shaped supporting surface, and when the guide wheel moves to a preset position along the arc-shaped supporting surface, the turning frame rotates to a vertical state.

[0006] When the connecting seat and the base slide relative to each other, the guide wheel is driven to move along the arc-shaped supporting surface by the forward sliding of the connecting seat, and the guide wheel and the swing arm drive the connecting shaft to rotate, thereby driving the turning frame to turn over. This structure makes the turning of the turning frame more stable and smooth, and not easy to get stuck.

[0007] Preferably, a limiting piece is provided on the end of the swing arm opposite to the guide wheel, and a limiting portion is provided on the side of the connecting seat, and when the turning frame turns to a vertical state, the limiting piece is limited by the limiting portion. The limiting piece cooperates with the limiting portion to limit the turning angle of the turning frame, and has good stability.

[0008] Preferably, a limiting mechanism is provided between the connecting seat and the base. When the driving chain drives the connecting seat and the base forward, the connecting seat and the base are limited by the limiting mechanism. When the base stops moving and the driving chain continues to move forward, the limiting mechanism releases the limit. When the connecting seat and the base move synchronously, the limiting mechanism connects the connecting seat and the base. When the base stops moving, the limiting mechanism can contact the limit again to make the connecting seat and the base slide relative to each other, thereby driving the swing arm to move.

[0009] Preferably, the limiting mechanism comprises a first limiting component arranged on the base and a second limiting component arranged on the connecting seat; when the driving chain drives the connecting seat and the base forward, the second limiting component abuts against the first limiting component for limiting; when the base stops moving and the driving chain continues to move forward, the first limiting component is displaced to avoid and then disengages from the second limiting component.

[0010] Preferably, the first limit assembly includes a shell fixed on the base, a first limit member supported by a first elastic member in the shell, and the first limit member is provided with a first supporting inclined surface facing the rear end of the base; the second limit assembly includes a second limit member rotatably arranged on the side of the connecting seat, and a second elastic member abutting the front side of the second limit member, and the second limit member is provided with a second supporting inclined surface facing the front end of the base; when the driving chain drives the connecting seat forward, the second supporting inclined surface abuts against the first supporting inclined surface so that the base and the connecting seat move forward synchronously; when the base stops moving, the driving chain drives the connecting seat to continue moving so that the second limit member is separated from the first limit member.

[0011] Preferably, the base is provided with a plurality of bottom wheels moving along the plane, and the bottom wheels reduce the resistance of the base moving on the plane.

[0012] Preferably, a locking mechanism is provided between the turning frame and the traction head; when the turning frame is in a horizontal state, the turning frame and the traction head are locked by the locking mechanism; when the turning frame is turned from a horizontal state to a vertical state, the locking mechanism is unlocked, and the traction head is separated from the turning frame from the upper end of the turning frame under the action of the drive chain.

[0013] Preferably, the locking mechanism includes a driving member and a latch fixed on the side of the driving member, the middle portion of the driving member is rotatably connected to the side of the flip frame, a through hole is provided on the side of the flip frame corresponding to the latch, a socket is provided on the traction head corresponding to the through hole, a third elastic member is provided between the driving member and the flip frame, and a stopper is fixed on the base corresponding to the rear end of the driving member; when the flip frame is in a horizontal state, the end of the driving member is blocked by the stopper so that the latch passes through the through hole and is inserted into the socket; when the flip frame is flipped to a vertical state, the lower end of the driving member is separated from the stopper so that the latch falls out of the socket.

[0014] Preferably, a protrusion is provided on the side of the traction head corresponding to the front end of the driving member, and the protrusion is provided with an inclined surface facing the driving member. When the driving chain drives the traction head into the flip frame, the inclined surface drives the driving member to rotate so that the pin is inserted into the socket.

[0015] Preferably, a supporting wheel is provided at the rear end of the driving member; when the turning frame is in a horizontal state, the supporting wheel elastically abuts against the stopper; when the turning frame is turned over to a vertical state, the supporting wheel abuts against the top of the stopper.

[0016] Therefore, the utility model has the beneficial effects of stable structure and smooth turning of the turning frame without being stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is a schematic diagram of the flip frame flipping to a vertical state.

[0019] Figure 3 for Figure 2 Exploded diagram.

[0020] Figure 4 This is a schematic diagram of the state where the guide wheel is located at the lower end of the arc-shaped supporting surface.

[0021] Figure 5 This is a state diagram of the guide wheel driving the flip frame to flip along the arc-shaped supporting surface.

[0022] Figure 6 for Figure 1 Top view of the .

[0023] Figure 7 for Figure 6 A partial enlarged schematic diagram in the middle.

[0024] Figure 8 for Figure 2 Top view of the .

[0025] Fig. 9 for Figure 8 A partial enlarged schematic diagram of point B in the middle.

[0026] Fig.10 It is a schematic diagram of the structure of the second limiting component.

[0027] Fig.11 It is a schematic diagram of the structure of the first limiting component.

[0028] Fig.12 It is a schematic diagram of the connection between the locking mechanism and the flip frame.

[0029] Fig.13This is a schematic diagram of the unlocked state of the locking mechanism. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention.

[0031] It should be understood that, in this document, the expressions "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.

[0032] like Figure 1-Figure 5 The traction mechanism shown in the figure comprises a base 10, a connecting base 11, a turning frame 12 and a traction head 13. The connecting base 11 is slidably arranged on the base 10. A limiting belt 15 is arranged on the base 10. A plurality of bottom wheels 16 that travel along a plane are arranged on the base 10. The traction head 13 is arranged inside the turning frame 12. An actively retractable driving chain 14 is arranged at the rear end of the traction head 13. The rear end of the turning frame 12 is rotatably connected to the connecting base 11 through a connecting shaft 20. The connecting shaft 20 rotates synchronously with the turning frame 12. The outer end of the connecting shaft 20 is fixedly provided with a swing arm 21, and the swing arm 21 is provided with a guide wheel 22 which is eccentrically distributed with the connecting shaft 20; the base 10 is fixedly provided with a guide wheel seat 23, and the guide wheel seat 23 is provided with an arc-shaped supporting surface 230 extending from bottom to top, and the guide wheel 22 abuts against the arc-shaped supporting surface 230; when the flip frame 12 is in a horizontal state, the guide wheel 22 is located at the lower end of the arc-shaped supporting surface 231, and when the guide wheel 22 moves to a preset position along the arc-shaped supporting surface 230, the flip frame 12 rotates to a vertical state.

[0033] A limiting member 210 is provided on the end of the swing arm 21 opposite to the guide wheel 22, and a limiting portion 110 is provided on the side of the connecting seat 11. When the flip frame 12 flips to a vertical state, the limiting member 210 is limited by the limiting portion 110. In this embodiment, the limiting member 210 is a limiting pin or a limiting column, and the limiting portion 110 is a limiting bump.

[0034] like Figure 6-Figure 11As shown, a limiting mechanism 30 is provided between the connecting seat 11 and the base 10. When the driving chain 14 drives the connecting seat 11 and the base 10 forward, the connecting seat 11 and the base 10 are limited by the limiting mechanism 30; when the base 10 stops moving and the driving chain continues to move forward, the limiting mechanism 30 releases the limit. The limiting mechanism 30 includes a first limiting component 31 arranged on the base 10 and a second limiting component 32 arranged on the side of the connecting seat 11; when the driving chain 14 drives the connecting seat 11 and the base 10 forward, the second limiting component 32 abuts against the first limiting component 31 for limiting; when the base 10 stops moving and the driving chain continues to move forward, the first limiting component 31 is displaced and evaded and then separated from the second limiting component 32. When the pressure on the first limiting component is greater than the preset value, elastic expansion and contraction or elastic rotational avoidance can occur, and elastic reset can occur when the pressure is released. Similarly, the second limiting component can also be set to be elastically expandable and retractable or elastically rotated to meet the needs.

[0035] In this embodiment, the first limiting component 31 includes a shell 310 fixed on the base 10, a first limiting component 312 arranged in the shell and supported by a first elastic component 311, and the first limiting component 312 is provided with a first supporting inclined surface 3120 facing the rear end of the base 10; the second limiting component 32 includes a second limiting component 320 rotatably arranged on the side of the connecting seat 11, and a second elastic component 321 abutting against the front side of the second limiting component, and the second limiting component is provided with a second supporting inclined surface 322 facing the front end of the base 10; when the driving chain 14 drives the connecting seat 11 forward, the second supporting inclined surface 322 abuts against the first supporting inclined surface 3120 so that the base and the connecting seat move forward synchronously; when the base 10 stops moving, the driving chain 14 drives the connecting seat to continue moving so that the second limiting component 320 is separated from the first limiting component 312.

[0036] like Fig.12 and Fig.13As shown, a locking mechanism 40 is provided between the turning frame 12 and the traction head 13; when the turning frame 12 is in a horizontal state, the turning frame 12 and the traction head 13 are locked by the locking mechanism 40; when the turning frame 12 is turned from a horizontal state to a vertical state, the locking mechanism 40 is unlocked, and the traction head 13 is separated from the turning frame from the upper end of the turning frame 12 under the action of the drive chain 14. Specifically, the locking mechanism 40 includes a driving member 41 and a latch 42 fixed on the side of the driving member. The middle part of the driving member 41 is rotatably connected to the side of the flip frame 12. A through hole is provided on the side of the flip frame 12 corresponding to the latch, and a socket is provided on the traction head 13 corresponding to the through hole. A third elastic member 43 is provided between the driving member 41 and the flip frame 12. A stopper 17 is fixed on the base 10 corresponding to the rear end of the driving member. A supporting wheel 44 is provided at the rear end of the driving member 41. When the flip frame 12 is in a horizontal state, the supporting wheel 44 elastically abuts against the stopper 17, and the end of the driving member 41 is blocked by the stopper so that the latch passes through the through hole and is inserted into the socket; when the flip frame 12 is flipped to a vertical state, the supporting wheel moves to the top surface of the stopper and abuts against the top surface of the stopper, and the latch 42 is disengaged from the socket under the action of the third elastic member.

[0037] A protrusion 130 is provided on the side of the traction head 13 corresponding to the front end of the driving member. The protrusion 130 is provided with an inclined surface 131 facing the driving member. When the driving chain 14 drives the traction head 13 to enter the turning frame 12, the inclined surface drives the driving member to rotate so that the pin is inserted into the socket.

[0038] In this embodiment, the first elastic member, the second elastic member and the third elastic member are all springs.

[0039] In conjunction with the accompanying drawings, the principle of the utility model is as follows: Figure 1 As shown, the drive chain 14 and the limiting belt 15 are connected to the baler, the drive chain can be controlled to actively extend and retract, and the limiting belt can be passively retracted and extended; the initial state is as shown in FIG. Figure 1 As shown, the strapping belt passes through the flip frame and is connected to the traction head, the limiting belt is in a relaxed state, the locking mechanism is in a locked state, and the state of the limiting mechanism between the base and the connecting seat is as shown in FIG. Figure 7 As shown, the drive chain 14 drives the base to move from one end of the tray (the object is stored on the tray) into the bottom to the other end of the tray. At this time, the limit belt tightens the base so that the base cannot move further. The drive chain continues to drive the connecting seat to move forward, and the pressure on the first limit member 312 increases, so that it shrinks into the shell and releases the limit. The state of the first limit assembly and the second limit assembly after the limit is released is shown in FIG. Fig. 9 As shown, the connecting seat continues to move forward and slides relative to the base. Figure 4 The status shown moves to Figure 5In the state shown in FIG. 1 , during the movement, the guide wheel moves along the arc-shaped support surface, so that the flip frame flips from the horizontal state to the vertical state; after the flip frame flips to the vertical state, the support wheel 44 in the locking mechanism is separated from the stopper 17, thereby realizing automatic unlocking. The unlocked state is as shown in FIG. Fig.13 As shown in the figure, after the locking mechanism is unlocked, the traction head is separated from the turning frame, and the driving chain drives the traction head (baling belt) to move upward and bypass the object to be packaged and return to the side where the baler is located, so that the strapping belt can wrap around the object to bundle the object and the pallet together; then the traction head is separated from the strapping belt, and the driving chain drives the traction head to reset, the traction head enters the turning frame and drives the turning frame to reset to a horizontal state, and the locking mechanism is locked again after resetting, and the limit mechanism is moved from Fig. 9 Status reset to Figure 7 status.

[0040] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.

[0041] Although specific embodiments of the present invention are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present invention. Various substitutions, changes and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A traction mechanism, comprising a base (10), a connecting base (11), a turning frame (12) and a traction head (13), wherein the connecting base (11) is slidably arranged on the base (10), a limiting belt (15) is arranged on the base (10), the traction head (13) is arranged inside the turning frame (12), and a driving chain (14) that can be actively retracted is arranged at the rear end of the traction head (13), wherein: The rear end of the turning frame (12) is rotatably connected to the connecting seat (11) via a connecting shaft (20); the connecting shaft (20) rotates synchronously with the turning frame (12); a swing arm (21) is fixedly provided at the outer end of the connecting shaft (20); and a guide wheel (22) is provided on the swing arm (21) and is eccentrically distributed with respect to the connecting shaft (20); A guide wheel seat (23) is fixedly provided on the base (10); an arc-shaped support surface (230) extending from bottom to top is provided on the guide wheel seat (23); the guide wheel (22) abuts against the arc-shaped support surface (230); when the turning frame (12) is in a horizontal state, the guide wheel (22) is located at the lower end of the arc-shaped support surface (230); when the guide wheel (22) moves along the arc-shaped support surface (230) to a preset position, the turning frame (12) rotates to a vertical state.

2. A traction mechanism according to claim 1, characterized in that: A limiting member (210) is provided on the swing arm (21) at an end opposite to the guide wheel (22), and a limiting portion (110) is provided on a side surface of the connecting seat (11); when the turning frame (12) turns over to a vertical state, the limiting member (210) is limited by the limiting portion (110).

3. A traction mechanism according to claim 1, characterized in that: A limiting mechanism (30) is provided between the connecting seat (11) and the base (10); when the driving chain (14) drives the connecting seat (11) and the base (10) to move forward, the connecting seat (11) and the base (10) are limited by the limiting mechanism (30); when the base (10) stops moving and the driving chain continues to move forward, the limiting mechanism (30) releases the limit.

4. A traction mechanism according to claim 3, characterized in that: The limiting mechanism (30) comprises a first limiting component (31) arranged on the base (10) and a second limiting component (32) arranged on the connecting seat (11); When the drive chain (14) drives the connecting seat (11) and the base (10) forward, the second limit assembly (32) abuts against the first limit assembly (31) to limit position; when the base (10) stops moving and the drive chain continues to move forward, the first limit assembly (31) moves away from the second limit assembly (32) and then disengages.

5. A traction mechanism according to claim 4, characterized in that: The first limiting component (31) comprises a shell (310) fixedly mounted on the base (10), and a first limiting member (312) arranged in the shell and supported by a first elastic member (311), wherein the first limiting member (312) is provided with a first supporting inclined surface (3120) facing the rear end of the base (10); The second limiting component (32) comprises a second limiting member (320) rotatably arranged on the side of the connecting seat (11), and a second elastic member (321) abutting against the front side of the second limiting member, and the second limiting member is provided with a second supporting inclined surface (322) facing the front end of the base (10); When the drive chain (14) drives the connecting seat (11) forward, the second supporting inclined surface (322) abuts against the first supporting inclined surface (3120) so that the base and the connecting seat move forward synchronously; when the base (10) stops moving, the drive chain (14) drives the connecting seat to continue moving so that the second limiting member (320) is separated from the first limiting member (312).

6. A traction mechanism according to claim 1, characterized in that: The base (10) is provided with a plurality of bottom wheels (16) that move along a plane.

7. A traction mechanism according to claim 1, characterized in that: A locking mechanism (40) is provided between the turning frame (12) and the traction head (13); When the turning frame (12) is in a horizontal state, the turning frame (12) and the traction head (13) are locked by the locking mechanism (40); When the turning frame (12) turns over from a horizontal state to a vertical state, the locking mechanism (40) is unlocked, and the traction head (13) is separated from the turning frame from the upper end of the turning frame (12) under the action of the drive chain (14).

8. A traction mechanism according to claim 7, characterized in that: The locking mechanism (40) comprises a driving member (41) and a latch (42) fixedly mounted on a side of the driving member; a middle portion of the driving member (41) is rotatably connected to a side of the turning frame (12); a through hole is provided on the side of the turning frame (12) at a position corresponding to the latch; a plug hole is provided on the traction head (13) at a position corresponding to the through hole; a third elastic member (43) is provided between the driving member (41) and the turning frame (12); and a stopper (17) is fixedly mounted on the base (10) at a position corresponding to the rear end of the driving member; When the flip frame (12) is in a horizontal state, the end of the driving member (41) is blocked by the stopper, so that the latch passes through the through hole and is inserted into the insertion hole; when the flip frame (12) is flipped to a vertical state, the lower end of the driving member (41) is separated from the stopper (17), so that the latch (42) is disengaged from the insertion hole.

9. A traction mechanism according to claim 8, characterized in that: A convex block (130) is provided at a position corresponding to the front end of the driving member on the side surface of the traction head (13), and an inclined surface (131) facing the driving member is provided on the convex block (130). When the driving chain (14) drives the traction head (13) to enter the turning frame (12), the inclined surface drives the driving member to rotate so that the latch is inserted into the insertion hole.

10. A traction mechanism according to claim 8, characterized in that: A supporting wheel (44) is provided at the rear end of the driving member (41); When the turning frame (12) is in a horizontal state, the support wheel (44) elastically abuts against the stopper (17); when the turning frame (12) is turned over to a vertical state, the support wheel abuts against the top of the stopper.

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