Bale press advance and retreat belt mechanism

Abstract

The present application relates to packaging equipment technical field, especially packing machine advance and retreat band mechanism, including driving wheel, first driven wheel and band channel, driving wheel and first driven wheel transmission connection, packing band from the entrance of band channel, from the driving wheel and first driven wheel, and by first driven wheel, packing band is pressed on driving wheel, the pressure of first driven wheel to packing band is controlled by electromagnet. The packing machine advance and retreat band mechanism of the present application is controlled by electromagnet to apply constant tension to driven wheel, so that the pressure of driven wheel to packing is constant force, which is suitable for packing band of different thickness, and keeps the uniformity of advance and retreat speed.

Description

Technical Field

[0001] This invention relates to the field of packaging equipment technology, and in particular to the packing machine's feed and retraction mechanism. Background Technology

[0002] A strapping machine, also known as a bundling machine or strapping strapping machine, is a machine that uses strapping tape to wrap around products or packages, then tightens it and connects the ends by heat melting or using buckles or other materials. Its function is to ensure that the strapping tape adheres tightly to the surface of the bundled goods, preventing the goods from scattering during transportation and storage due to loose strapping, while also ensuring neat and aesthetically pleasing bundling. Existing fully automatic strapping machines have a fixed gap between the drive and driven wheels in their strapping mechanism. However, the thickness of the strapping tape varies. If the strapping tape is too thick, it may cause damage when passing through the gap between the drive and driven wheels; conversely, if the strapping tape is too thin, it may cause uneven feeding and movement. Chinese patent CN211810377UA discloses a fully automatic strapping machine's feed and retraction mechanism, including a housing. A strap reel is fixedly connected to the right side of the housing, and strapping is wound inside the reel. The strapping is sequentially connected to an auxiliary wheel, a drive wheel, and a driven wheel from bottom to top. The auxiliary wheel is rotatably connected to the housing, and a connecting rod is rotatably connected inside the driven wheel. A lower guide rod is fixedly connected to the upper surface of the connecting rod, and a spring is sleeved on the outer side of the lower guide rod. The spring is in a compressed state, providing compression and elasticity, which enables the driven wheel to automatically tighten the strapping. The disadvantage of this patented technology is that it uses the force of a first compression spring to adjust the tension of the driven wheel on the strapping. However, the force of the first compression spring is inconsistent for strapping of different thicknesses, resulting in less friction between thinner strapping and the drive wheel, making it prone to slippage and causing uneven feed and retraction speeds. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a constant-pressure strapping machine feed and retraction mechanism that keeps the friction between the strapping and the drive wheel constant, thereby improving the accuracy of strapping feed and retraction.

[0004] The object of this invention is achieved in the following manner: a strapping machine feed and retraction mechanism.

[0005] It includes a drive wheel, a first driven wheel, and a belt conveyor. The drive wheel and the first driven wheel are connected by a drive mechanism. The packing strap enters and exits from the inlet of the belt conveyor, passes between the drive wheel and the first driven wheel, and is pressed onto the drive wheel by the first driven wheel. The pressure of the first driven wheel on the packing strap is controlled by an electromagnet.

[0006] In this invention, the packing strap is moved forward and backward by the forward and reverse rotation of the driving wheel and the first driven wheel. The first driven wheel presses the packing strap onto the driving wheel, and under the action of friction, the packing strap is moved forward and backward. The pressure of the first driven wheel on the packing strap 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 packing strap is a constant force, and the friction between the packing strap and the driving wheel is constant, ensuring the uniformity of the packing strap's forward and backward speed.

[0007] As an optional solution to the technical solution of the present invention, the driving wheel and the first driven wheel are disposed between two oppositely arranged support plates;

[0008] The first driven wheel is connected to the first crankshaft via a transmission, and moves away from or towards the driving wheel as the first crankshaft rotates.

[0009] The push-pull rod of the electromagnet is connected to the first crankshaft drive, providing a constant force for the rotation of the first crankshaft.

[0010] In this 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 a pulling force, it causes the first crankshaft to rotate. The gap between the first driven wheel and the driving wheel is adjusted according to the thickness of the packing strap.

[0011] As an optional solution of the technical solution of the present invention, one end of the first crankshaft is connected to the shaft of the first driven wheel, and the other end passes through the support plate on one side and is connected to the first swing block;

[0012] The support plate is provided with a first spring stop bar, and a first compression spring is connected between the first swing block and the first spring stop bar.

[0013] The push-pull rod of the electromagnet is connected to the first pendulum block through the first pull wire, causing the first pendulum block to swing.

[0014] As an optional embodiment of the technical solution of the present invention, the support plate is provided with a wire holder, and the wire holder is provided with a roller, the first wire passing around the roller and connecting to the first swing block.

[0015] As an optional solution of the technical solution of the present invention, it also includes a second driven wheel, which is connected to the driving wheel. The packing strap enters and exits from the inlet of the belt channel, passes between the driving wheel and the first driven wheel, the driving wheel and the second driven wheel, and the first driven wheel and the second driven wheel press the packing strap onto the driving wheel.

[0016] 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 swing block;

[0017] The support plate is provided with a second spring stop bar, and a second compression spring is connected between the second swing block and the spring stop bar;

[0018] The push-pull rod of the electromagnet is connected to the second pendulum block via a second pull wire that passes over a roller, causing the second pendulum block to swing.

[0019] The invention incorporates a second driven wheel path, which improves the stability of the packing belt during forward and backward movement. An electromagnet simultaneously controls the pressure of the first and second driven wheels on the packing belt. The structure is simple, easy to maintain, and cost-effective.

[0020] As an optional solution of the technical solution of the present invention, the inlet of the belt conveyor is provided with a belt pressing plate, and a belt measuring wheel shaft is provided below the belt pressing plate;

[0021] The packing strap passes between the pressure plate and the measuring pulley shaft;

[0022] The measuring pulley shaft is electrically connected to the Hall sensor.

[0023] In this invention, a Hall sensor is applied to the position of the conveyor belt. After the packing strap stops moving forward or backward, the signal is transmitted to the packing machine mechanism for the next step.

[0024] 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 pressure plate (51).

[0025] The beneficial effects of this invention are:

[0026] (1) The packing machine feeding and retracting mechanism of the present invention uses an electromagnet to apply a constant tension to the driven wheel, so that the pressure of the driven wheel pressing the packing onto the driving wheel is constant. It is suitable for packing straps of different thicknesses and maintains the uniformity of the feeding and retracting speed.

[0027] (2) The present invention controls two driven wheels simultaneously by an electromagnet and applies the same constant tension to the two driven wheels to maintain a constant pressure on the packing strap by the two driven wheels;

[0028] (3) The present invention has a measuring belt wheel shaft on the belt conveyor. The measuring belt wheel shaft is electrically connected to the Hall sensor. When the packing belt stops conveying, the measuring belt wheel shaft stops rotating. After the Hall sensor receives the signal that the measuring belt wheel shaft has stopped rotating, it sends a signal to the packing machine core, and the packing machine core performs the next action. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the packing machine's feed and retraction mechanism of the present invention;

[0031] Figure 2 This is a schematic diagram of the packing machine's conveyor belt feeding and retracting mechanism from another perspective.

[0032] Figure 3 This is a schematic diagram of the structure of the packing machine's conveyor belt feeding and retracting mechanism after removing one side support plate and motor;

[0033] Figure 4 This is a partial structural diagram of the first driven wheel and the second driven wheel of the present invention.

[0034] Figure label:

[0035] 10-Drive wheel;

[0036] 20 - First driven wheel; 21 - First crankshaft; 22 - First rocker block; 23 - First compression spring;

[0037] 30-Electromagnet; 31-First pull wire; 32-Pull wire holder; 321-Roller; 33-Second pull wire;

[0038] 40-Hall sensor;

[0039] 50 - Belt track; 51 - Pressure plate; 52 - Belt pulley shaft;

[0040] 60 - Second driven wheel; 61 - Second crankshaft; 62 - Second rocker block; 63 - Second compression spring;

[0041] 100 - Support plate; 101 - First spring stop lever; 102 - Second spring stop lever. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] 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 positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0044] In the description of the embodiments, unless otherwise explicitly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or a connection through an intermediate medium; it can also refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The packing machine's belt feeding and retracting mechanism includes: 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 by a transmission. In this embodiment, the driving wheel is driven to rotate by a motor, and the driving wheel and the first driven wheel are connected by a gear meshing on one side.

[0046] The strapping enters and exits through the inlet of the conveyor belt 50, passing between the drive wheel 10 and the first driven wheel 20. The first driven wheel 20 presses the strapping against the drive wheel 10, generating friction between the strapping and the drive wheel. The forward and reverse rotation of the drive wheel drives the strapping forward and backward. The pressure of the first driven wheel 20 on the strapping is controlled by an electromagnet 30. Since the electromagnet generates a constant force under a given current, the force applied by the electromagnet 30 to the first driven wheel 20 is constant. Therefore, the pressure of the first driven wheel on the strapping is constant, and the friction between the strapping and the drive wheel is constant, ensuring the uniformity of the strapping's forward and backward movement speed.

[0047] Specifically, the driving wheel 10 and the first driven wheel 20 are located between two opposing support plates 100, and the belt track is also located between the two support plates 100. The first driven wheel 20 is connected by a first crankshaft 21. One end of the first crankshaft 21 is connected to the shaft 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 swing block 22. A first spring stop rod 101 is provided on the support plate 100, and a first compression spring 23 is connected between the first swing block 22 and the first spring stop rod 101. The push-pull rod of the electromagnet 30 is connected to the first swing block 22 through a first pull wire 31, which drives the first swing block 22 to swing.

[0048] When a constant current is applied to the electromagnet, a constant attractive force is generated on the magnetic core, causing the push-pull rod of the electromagnet 30 to retract. The push-pull rod of the electromagnet 30 pulls the first swing block 22 to rotate through the first pull wire 31, thereby causing the first crankshaft 21 to drive the first driven wheel 20 to rotate. The gap between the first driven wheel and the driving wheel is adjusted according to the thickness of the packing strap, so that the pressure of the first driven wheel on the packing strap is a constant force, ensuring that the friction between the packing strap and the driving wheel is constant, making the packing strap feeding and retraction more stable and the speed uniform.

[0049] To ensure the smooth movement of the first pull line 31, a pull line seat 32 is provided on the support plate 100. A roller 321 is provided on the pull line seat 32, and the first pull line 31 passes around the roller 321 and connects to the first swing block 22.

[0050] In addition, the packing machine's feed and retraction mechanism in this embodiment also includes a second driven wheel 60. The second driven wheel 60 is connected to the driving wheel 10 through gear meshing. The packing strap enters and exits from the inlet of the belt channel 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. The first driven wheel 20 and the second driven wheel 60 press the packing strap 40 onto the driving wheel 10.

[0051] Specifically, the second driven wheel 60 is driven by the second crankshaft 61. One end of the second crankshaft 61 is connected to the shaft 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 swing block 62.

[0052] The support plate 100 is provided with a second spring stop 102, and a second compression spring 63 is connected between the second swing block 62 and the spring stop 101.

[0053] The push-pull rod of the electromagnet 30 is connected to the second swing block 62 via the second pull wire 33, which passes around the roller 321, causing the second swing block 62 to swing.

[0054] The invention incorporates a second driven wheel path, which improves the stability of the packing belt during forward and backward movement. An electromagnet simultaneously controls the pressure of the first and second driven wheels on the packing belt. The structure is simple, easy to maintain, and cost-effective.

[0055] As a further embodiment, a pressure plate 51 is rotatably provided at the entrance of the conveyor belt 50. A torsion spring is provided at one end of the shaft of the pressure plate 51, and a measuring wheel shaft 52 is provided below the pressure plate 51. The packing strap passes between the pressure plate 51 and the measuring wheel shaft 52. The measuring wheel shaft 52 is electrically connected to the Hall sensor 40.

[0056] In this invention, a Hall sensor is applied to the position of the conveyor belt. After the packing strap stops moving forward or backward, the signal is transmitted to the packing machine mechanism for the next step.

[0057] The working process of the packing machine's feed and retraction mechanism in this embodiment is as follows: The packing strap enters from the belt conveyor entrance, passes between the pressure plate 51 and the measuring wheel shaft 52, then sequentially passes between the first driven wheel 20 and the driving wheel 10, and between the second driven wheel 60 and the driving wheel 10, and then exits from the belt conveyor exit into the core part of the packing machine. A first compression spring 23 is connected between the first swing block 22 and the first spring stop 101, and a second compression spring 63 is connected between the second swing block 62 and the spring stop 101. When the electromagnet's push-pull rod 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 move closer to the driving wheel 10. When the electromagnet is energized, its push-pull rod retracts, pulling the first swing block 22 and the second swing block 62 to rotate through the first pull line 31 and the second pull line 33, respectively. This causes the first crankshaft 21 and the second crankshaft 61 to 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 thickness is uneven, maintain a constant friction between the strapping and the drive wheel. When feeding the strapping, the drive wheel rotates forward; when unloading the strapping, the drive wheel rotates in reverse.

[0058] When the strapping tape is fed in or unfurled, the strapping tape will stop feeding. The measuring belt shaft 52 will stop rotating without the strapping tape driving it. After receiving the signal that the measuring belt shaft 52 has stopped, the Hall sensor sends a signal to the strapping machine core, and the strapping machine core will proceed to the next step.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them; 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 claimed by the present invention.

Claims

1. A strapping machine's feed and retraction mechanism, characterized in that, It includes a drive wheel (10), a first driven wheel (20) and a belt conveyor (50). The drive wheel (10) and the first driven wheel (20) are connected by a drive. The packing strap enters and exits from the inlet of the belt conveyor (50), passes between the drive wheel (10) and the first driven wheel (20), and is pressed onto the drive wheel (10) by the first driven wheel (20). The pressure of the first driven wheel (20) on the packing strap is controlled by an electromagnet (30). The driving wheel (10) and the first driven wheel (20) are located between two opposing support plates (100); The first driven wheel (20) is connected to the first crankshaft (21) for transmission. Under the rotation of the first crankshaft (21), it moves away from or closer to the driving wheel (10). The push-pull rod of the electromagnet (30) is connected to the first crankshaft (21) for transmission, providing a constant force for the rotation of the 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 the support plate (100) on one side and is connected to the first swing block (22); The support plate (100) is provided with a first spring stop bar (101), and a first compression spring (23) is connected between the first swing block (22) and the first spring stop bar (101). The push-pull rod of the electromagnet (30) is connected to the first pendulum block (22) through the first pull line (31), which causes the first pendulum block (22) to swing. The support plate (100) is provided with a pull wire seat (32), and the pull wire seat (32) is provided with a roller (321). The first pull wire (31) passes around the roller (321) and connects to the first swing block (22). It also includes a second driven wheel (60), which is connected to the driving wheel (10) in a transmission manner. The packing strap enters and exits from the inlet of the belt channel (50), passes between the driving wheel (10) and the first driven wheel (20), the driving wheel (10) and the second driven wheel (60), and is pressed onto the driving wheel (10) by the first driven wheel (20) and the second driven wheel (60). The second driven wheel (60) is connected to the second crankshaft (61) via a transmission. 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 swing block (62). The support plate (100) is provided with a second spring stop (102), and a second compression spring (63) is connected between the second swing block (62) and the spring stop (101). The push-pull rod of the electromagnet (30) is connected to the second swing block (62) via the second pull line (33) passing over the roller (321), causing the second swing block (62) to swing. The belt conveyor (50) is rotatably provided with a belt pressure plate (51) at its entrance, and a belt measuring wheel shaft (52) is provided below the belt pressure plate (51). The packing strap passes between the pressure plate (51) and the measuring pulley shaft (52); The measuring pulley shaft (52) is electrically connected to the Hall sensor (40).

2. The packing machine feed and retraction mechanism according to claim 1, characterized in that, One end of the rotating shaft of the pressure plate (51) is provided with a torsion spring.

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