Belt advancing and retreating mechanism of packing machine

Abstract

The invention relates to the technical field of packaging equipment, in particular to a belt advancing and retreating mechanism of a packaging machine. Comprising a driving wheel, a first driven wheel and a belt track, the driving wheel is in transmission connection with the first driven wheel, a packing belt enters and exits from an inlet of the belt track and passes through the space between the driving wheel and the first driven wheel, the packing belt is pressed on the driving wheel through the first driven wheel, and the pressure of the first driven wheel on the packing belt is controlled through an electromagnet. According to the belt advancing and retreating mechanism of the packing machine, constant pulling force is applied to the driven wheel under the control of the electromagnet, so that the pressure of the driven wheel for pressing packing on the driving wheel is constant, the belt advancing and retreating mechanism is suitable for packing belts with different thicknesses, and the constant speed of the belt advancing and retreating speed is kept.

Description

Technical Field

[0001] The invention relates to the technical field of packaging equipment, in particular to an advance and retreat belt mechanism of a packaging machine. Background Art

[0002] A baler, also known as a strapping machine or a strapping machine, is a machine that wraps a product or package with strapping tape, then tightens it and melts the two ends through thermal effects or connects them using buckles and other materials. Its function is to make the strapping tape close to the surface of the strapped goods, to ensure that the goods do not fall apart during transportation and storage due to loose strapping, and to ensure that the strapping is neat and beautiful. The existing automatic strapping machine advance and retreat belt mechanism has a fixed gap between the driving wheel and the driven wheel, and the thickness of the strapping tape has a certain thickness error. When a strapping tape that is too thick passes through the gap between the driving wheel and the driven wheel, it may cause crushing injuries, and when a strapping tape that is too thin passes through the gap between the driving wheel and the driven wheel, the advance and retreat transmission may not be smooth. Chinese patent CN211810377UA discloses a fully automatic strapping machine advance and retreat belt mechanism, including a housing, a belt reel is fixedly connected to the right side of the housing, a strapping belt is rolled inside the belt reel, the strapping belt is sequentially contacted and connected with an auxiliary wheel, a driving wheel and a driven wheel from bottom to top, the auxiliary wheel is rotatably connected to the housing, the driven wheel is rotatably connected with a connecting rod, the upper end surface of the connecting rod is fixedly connected to a lower guide rod, the outer side of the lower guide rod is sleeved with a spring, the spring is in a state of compressed elastic force, and has the effect of compressed elastic force, and the elastic force enables the driven wheel to have the function of automatically pressing the strapping belt. The disadvantage of this patented technology is that the force of the first compression spring is used to adjust the pulling force of the driven wheel on the strapping belt, but for strapping belts of different thicknesses, the force of the first compression spring is inconsistent, which will cause the friction between the thinner strapping belt and the driving wheel to be smaller and easy to slip, thereby causing uneven advance and retreat belt speed. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a constant-pressure strapping machine advance and retreat belt mechanism, which keeps the friction between the strapping belt and the driving wheel constant and improves the accuracy of the strapping belt advance and retreat belt.

[0004] The object of the present invention is achieved in the following manner: the strapping machine forward and backward belt mechanism, It includes a driving wheel, a first driven wheel and a belt path. The driving wheel and the first driven wheel are connected in transmission. The strapping belt enters and exits from the entrance of the belt path, passes between the driving wheel and the first driven wheel, and the strapping belt is pressed against the driving wheel by the first driven wheel. The pressure of the first driven wheel on the strapping belt is controlled by an electromagnet.

[0005] In the present invention, the strapping belt is advanced and retreated by the positive and reverse rotation of the driving wheel and the first driven wheel. The first driven wheel presses the strapping belt onto the driving wheel. Under the action of friction, the strapping belt is advanced and retreated. The pressure of the first driven wheel on the strapping belt is controlled by an electromagnet. Since the electromagnet provides a constant force, the electromagnet applies a constant force to the first driven wheel. Therefore, the pressure of the first driven wheel on the strapping belt is a constant force. Therefore, the friction force between the strapping belt and the driving wheel is constant, thereby ensuring the uniformity of the speed of the strapping belt being advanced and retreated.

[0006] As an optional solution of the technical solution of the present invention, the driving wheel and the first driven wheel are arranged between two oppositely arranged support plates; The first driven wheel is connected by a first crankshaft and moves away from or closer to the driving wheel under the rotation of the first crankshaft; The push-pull rod of the electromagnet is drivingly connected to the first crankshaft to provide a constant force for the rotation of the first crankshaft.

[0007] In the present invention, the push-pull rod of the electromagnet is connected to the first crankshaft, and the first crankshaft is connected to the first driven wheel. When the electromagnet generates pulling force, the first crankshaft rotates, and the gap between the first driven wheel and the driving wheel is adjusted according to the thickness of the packing belt.

[0008] As an optional solution of the technical solution of the present invention, one end of the first crankshaft is connected to the axis of the first driven wheel, and the other end passes through one side of the support plate and is connected to the first pendulum block; A first spring lever is provided on the support plate, and a first compression spring is connected between the first swing block and the first spring lever; The push-pull rod of the electromagnet is connected to the first swing block through the first pull wire, driving the first swing block to swing.

[0009] As an optional solution of the technical solution of the present invention, a wire pulling seat is provided on the support plate, a roller is provided on the wire pulling seat, and the first wire is connected to the first swing block by passing around the roller.

[0010] As an optional solution of the technical solution of the present invention, it also includes a second driven wheel, which is transmission-connected to the driving wheel. The strapping belt enters and exits from the entrance of the belt path, passes between the driving wheel and the first driven wheel, and between the driving wheel and the second driven wheel, and the first driven wheel and the second driven wheel press the strapping belt onto the driving wheel.

[0011] As an optional solution of the technical solution of the present invention, the second driven wheel is connected by a second crankshaft, one end of the second crankshaft is connected to the axis of the second driven wheel, and the other end passes through the support plate on one side and is connected to the second pendulum block; A second spring lever is provided on the support plate, and a second compression spring is connected between the second swing block and the spring lever; The push-pull rod of the electromagnet is connected to the second swing block through the second pull wire passing around the roller, driving the second swing block to swing The second driven wheel circuit is provided in the present invention, which improves the stability of the advance and retreat belt. The pressure of the first driven wheel and the second driven wheel on the packing belt is controlled by the electromagnet at the same time. The structure is simple, maintenance is convenient, and cost is saved.

[0012] As an optional solution of the technical solution of the present invention, a belt pressing plate is rotatably provided at the entrance of the belt path, and a belt measuring wheel shaft is provided below the belt pressing plate; The packing belt passes between the belt pressing plate and the belt measuring wheel shaft; The measuring pulley shaft is electrically connected to the Hall sensor.

[0013] In the present invention, the Hall sensor is applied to the position of the belt path, and after the strapping belt stops moving forward and backward, the signal is transmitted to the strapping machine movement to carry out the next step.

[0014] As an optional solution of the technical solution of the present invention, a torsion spring is provided at one end of the rotating shaft of the belt pressing plate (51).

[0015] The beneficial effects of the present invention are: (1) The strapping machine's advance and retreat belt mechanism of the present invention is controlled by an electromagnet to apply a constant pulling force to the driven wheel, so that the pressure of the driven wheel pressing the strap on the driving wheel is a constant force, which is suitable for strapping straps of different thicknesses and maintains the uniformity of the advance and retreat belt speed; (2) The present invention controls two driven wheels simultaneously through an electromagnet and applies the same constant pulling force to the two driven wheels to maintain a constant pressure of the two driven wheels on the strapping tape; (3) The present invention provides a measuring pulley shaft on the belt path, and the measuring pulley shaft is electrically connected to the Hall sensor. When the strapping belt stops being transported, the measuring pulley shaft stops rotating. After the Hall sensor receives the signal indicating that the measuring pulley shaft has stopped rotating, it sends a signal to the strapping machine movement, and the strapping machine movement performs the next step. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of the forward and backward belt mechanism of the baler of the present invention; Figure 2 It is a structural schematic diagram of the forward and backward belt mechanism of the baler of the present invention from another perspective; Figure 3This is a schematic diagram of the structure of the baler forward and backward belt mechanism of the present invention after removing one side support plate and motor; Figure 4 It is a schematic structural diagram of the first driven wheel and the second driven wheel of the present invention.

[0018] Reference numerals: 10- driving wheel; 20-first driven wheel; 21-first crankshaft; 22-first pendulum block; 23-first compression spring; 30-electromagnet; 31-first pull wire; 32-pull wire seat; 321-roller; 33-second pull wire; 40-Hall sensor; 50-belt track; 51-belt pressing plate; 52-belt measuring pulley shaft; 60-second driven wheel; 61-second crankshaft; 62-second pendulum block; 63-second compression spring; 100 - support plate; 101 - first spring lever; 102 - second spring lever. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In the description of the embodiments, unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, a connection through an intermediate medium, or a communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] The baler advance and retreat belt mechanism comprises: a driving wheel 10, a first driven wheel 20 and a belt path 50, wherein the driving wheel 10 is connected to the first driven wheel 20. In this embodiment, the driving wheel is driven to rotate by a motor, and the driving wheel and the first driven wheel are connected to each other by a gear meshing transmission provided on one side.

[0023] The strapping belt enters and exits from the entrance of the belt path 50, passes between the driving wheel 10 and the first driven wheel 20, and the first driven wheel 20 presses the strapping belt on the driving wheel 10, so that friction is generated between the strapping belt and the driving wheel, and the strapping belt is driven forward and backward by the active forward and reverse rotation. The pressure of the first driven wheel 20 on the strapping belt is controlled by the electromagnet 30. Since the electromagnet generates a constant force under a certain current, the force applied by the electromagnet 30 to the first driven wheel 20 is a constant force, so that the pressure of the first driven wheel on the strapping belt is a constant force, so the friction between the strapping belt and the driving wheel is constant, which ensures the uniformity of the speed of the strapping belt to move forward and backward.

[0024] Specifically, the driving wheel 10 and the first driven wheel 20 are arranged between two oppositely arranged support plates 100, and the belt track is also located between the two support plates 100; the first driven wheel 20 is connected through a first crankshaft 21, one end of the first crankshaft 21 is connected to the axis of the first driven wheel 20, and the other end passes through one side of the support plate 100 and is connected to the first pendulum block 22; a first spring lever 101 is provided on the support plate 100, and a first compression spring 23 is connected between the first pendulum block 22 and the first spring lever 101; the push-pull rod of the electromagnet 30 is connected to the first pendulum block 22 through a first pull wire 31, driving the first pendulum block 22 to swing.

[0025] When a constant current is passed through the electromagnet, a constant suction force is generated on the magnetic core, so that the push-pull rod of the electromagnet 30 is retracted, and the push-pull rod of the electromagnet 30 pulls the first pendulum block 22 to rotate through the first pull wire 31, so that the first crankshaft 21 drives the first driven wheel 20 to rotate, and adjusts the gap between the first driven wheel and the driving wheel according to the thickness of the strapping tape, so that the pressure of the first driven wheel on the strapping tape is a constant force, ensuring the constant friction between the strapping tape and the driving wheel, making the strapping tape advance and retreat more stable and the speed uniform.

[0026] In order to ensure smooth movement of the first pull wire 31 , a pull wire seat 32 is provided on the support plate 100 . A roller 321 is provided on the pull wire seat 32 . The first pull wire 31 passes around the roller 321 and is connected to the first pendulum block 22 .

[0027] In addition, the baling machine advance and retract belt mechanism in this embodiment also includes a second driven wheel 60, and the second driven wheel 60 is connected to the driving wheel 10 through gear meshing transmission. The baling belt enters and exits from the entrance of the belt path 50, passes between the driving wheel 10 and the first driven wheel 20, and between the driving wheel 10 and the second driven wheel 60, and the baling belt 40 is pressed onto the driving wheel 10 by the first driven wheel 20 and the second driven wheel 60.

[0028] Specifically, the second driven wheel 60 is connected by a second crankshaft 61, one end of the second crankshaft 61 is connected to the axis of the second driven wheel 60, and the other end passes through the support plate 100 on one side and is connected to the second pendulum block 62; The support plate 100 is provided with a second spring lever 102, and a second compression spring 63 is connected between the second swing block 62 and the spring lever 101; The push-pull rod of the electromagnet 30 is connected to the second swing block 62 via the second pull wire 33 bypassing the roller 321, thereby driving the second swing block 62 to swing.

[0029] The second driven wheel circuit is provided in the present invention, which improves the stability of the advance and retreat belt. The pressure of the first driven wheel and the second driven wheel on the packing belt is controlled by the electromagnet at the same time. The structure is simple, maintenance is convenient, and cost is saved.

[0030] As a further solution of this embodiment, a belt pressing plate 51 is rotatably provided at the entrance of the belt path 50, a torsion spring is provided at one end of the rotating shaft of the belt pressing plate 51, and a measuring belt wheel shaft 52 is provided below the belt pressing plate 51; the packing belt passes between the belt pressing plate 51 and the measuring belt wheel shaft 52; the measuring belt wheel shaft 52 is electrically connected to the Hall sensor 40.

[0031] In the present invention, the Hall sensor is applied to the position of the belt path, and after the strapping belt stops moving forward and backward, the signal is transmitted to the strapping machine movement to carry out the next step.

[0032] The working process of the strapping machine's belt advance and retreat mechanism in this embodiment is as follows: the strapping belt enters from the belt path entrance, passes between the belt pressing plate 51 and the measuring belt wheel shaft 52, then passes between the first driven wheel 20 and the driving wheel 10, between the second driven wheel 60 and the driving wheel 10 in sequence, and then exits from the belt path exit and enters the strapping machine core part. A first compression spring 23 is connected between the first swing block 22 and the first spring lever 101, and a second compression spring 63 is connected between the second swing block 62 and the spring lever 101. When the push-pull rod of the electromagnet is not retracted, under the action of the first compression spring 23 and the second compression spring 63, the first driven wheel 20 and the second driven wheel 60 are close to each other with the driving wheel 10. When the electromagnet is energized, its push-pull rod is retracted, and the first swing block 22 and the second swing block 62 are pulled to rotate by the first pull wire 31 and the second pull wire 33, respectively, so that the first crankshaft 21 and the second crankshaft 61 respectively drive the first driven wheel 20 and the second driven wheel 60 to adjust the gap between them and the driving wheel 10. When the strapping tape is uneven in thickness, the friction between the strapping tape and the driving wheel is kept constant. When the strapping tape needs to be fed, the driving wheel rotates forward, and when the strapping tape needs to be withdrawn, the driving wheel rotates reversely.

[0033] When the strapping tape is fed in or retracted, the strapping tape stops being transported, and the measuring pulley shaft 52 stops rotating without the strapping tape. After the Hall sensor receives the signal that the measuring pulley shaft 52 has stopped, it sends a signal to the strapping machine movement, and the strapping machine movement proceeds to the next step.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement; when the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. The strapping machine forward and backward belt mechanism is characterized by: The invention comprises a driving wheel (10), a first driven wheel (20) and a belt track (50); the driving wheel (10) and the first driven wheel (20) are connected in driving connection; the strapping belt enters and exits from an entrance of the belt track (50), passes between the driving wheel (10) and the first driven wheel (20), and the strapping belt is pressed against the driving wheel (10) by the first driven wheel (20); the pressure of the first driven wheel (20) on the strapping belt is controlled by an electromagnet (30).

2. The baler advance and retreat belt mechanism according to claim 1, characterized in that: The driving wheel (10) and the first driven wheel (20) are arranged between two supporting plates (100) arranged opposite to each other; The first driven wheel (20) is connected to the driving wheel (10) through a first crankshaft (21) and moves away from or closer to the driving wheel (10) when the first crankshaft (21) rotates. The push-pull rod of the electromagnet (30) is in driving connection with the first crankshaft (21), providing a constant force for the rotation of the first crankshaft (21).

3. The strapping machine advance and retreat mechanism according to claim 2, characterized in that: One end of the first crankshaft (21) is connected to the axis of the first driven wheel (20), and the other end passes through one side of the support plate (100) and is connected to the first pendulum block (22); A first spring lever (101) is provided on the support plate (100), and a first compression spring (23) is connected between the first pendulum block (22) and the first spring lever (101); The push-pull rod of the electromagnet (30) is connected to the first swing block (22) via a first pull wire (31), driving the first swing block (22) to swing.

4. The strapping machine advance and retreat belt mechanism according to claim 3, characterized in that: A wire pulling seat (32) is provided on the support plate (100), a roller (321) is provided on the wire pulling seat (32), and the first wire pulling seat (31) passes around the roller (321) and is connected to the first swing block (22).

5. The strapping machine advance and retreat belt mechanism according to claim 4, characterized in that: The invention also comprises a second driven wheel (60), wherein the second driven wheel (60) is drivingly connected to the driving wheel (10); the strapping belt enters and exits from the entrance of the belt path (50), passes between the driving wheel (10) and the first driven wheel (20), and between the driving wheel (10) and the second driven wheel (60); and the first driven wheel (20) and the second driven wheel (60) press the strapping belt onto the driving wheel (10).

6. The strapping machine advance and retreat belt mechanism according to claim 5, characterized in that: The second driven wheel (60) is connected in transmission via a second crankshaft (61), one end of the second crankshaft (61) is connected to the axis of the second driven wheel (60), and the other end passes through one side of the support plate (100) and is connected to the second pendulum block (62); A second spring lever (102) is provided on the support plate (100), and a second compression spring (63) is connected between the second swing block (62) and the spring lever (101); The push-pull rod of the electromagnet (30) is connected to the second swing block (62) via a second pull wire (33) bypassing the roller (321), thereby driving the second swing block (62) to swing.

7. The strapping machine advance and retreat belt mechanism according to claim 1, characterized in that: A belt pressing plate (51) is rotatably provided at the entrance of the belt path (50), and a belt measuring wheel shaft (52) is provided below the belt pressing plate (51); The strapping belt passes between the strap pressing plate (51) and the strap measuring wheel shaft (52); The measuring wheel shaft (52) is electrically connected to the Hall sensor (40).

8. The strapping machine advance and retreat belt mechanism according to claim 7, characterized in that: A torsion spring is provided at one end of the rotating shaft of the belt pressing plate (51).

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