Method for controlling knotting of binding machine

Abstract

The present invention discloses a knot control method for a binding machine, the binding machine including a wrapping mechanism, a yarn twisting mechanism, a drive yarn feed wheel, a trigger, and a motor for driving and rotating the yarn twisting mechanism, the method comprising: controlling the drive yarn feed wheel to feed the binding yarn to the wrapping mechanism at a predetermined feed amount based on a first input signal generated by a user pressing the trigger; controlling the yarn twisting mechanism to twist the binding yarn at high speed according to a predetermined first speed and monitoring the output torque of the motor during the yarn twisting process; and, when the output torque reaches a set value, controlling the yarn twisting mechanism to twist a predetermined number of turns at a low speed in the same direction according to a predetermined second speed. The present invention can further tighten the binding yarn while reducing breakage, improving the degree of tightening of the binding yarn, thereby improving the efficiency of use of the binding yarn by the binding machine and further improving the binding efficiency of the binding machine.

Description

[Technical Field]

[0001] The present invention relates to the technical field of strapping machines, and more particularly to a method for controlling the knotting of a strapping machine. [Background technology]

[0002] A binding machine is a device for wrapping, securing, and tightening an object by bending a binding thread. As described in the patent document, the binding machine is equipped with structures such as a bending and forming section (i.e., a rolling mechanism), a twisting unit (i.e., a thread twisting mechanism), a feeding unit (i.e., a thread feed wheel, including a driving thread feed wheel and a driven thread feed wheel), and a binding trigger (i.e., a trigger). After the binding thread has wrapped and secured the object, the binding machine twists and ties both ends of the binding thread to tighten the object.

[0003] In actual use, when a binding machine twists and ties a binding thread, the knotting parameters are generally set manually based on experience. However, if the knotting parameters are set too loosely, the resulting knot may not be tight enough, necessitating the need to re-tie and tighten the binding, which is wasteful. Furthermore, multiple attempts must be made to tighten the binding thread without twisting it off. However, if the knotting parameters are set too tightly, the resulting knot may be twisted off, which is extremely dangerous and necessitates the need to re-tie the binding, which is wasteful.

[0004] Therefore, how to achieve accurate tying by the binding machine is very important. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Chinese Patent Application Publication No. 111706084 Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem that the present invention aims to solve is to provide a knotting control method for a binding machine that can reduce breakage of the binding thread, further tighten the binding thread, improve the degree of tightening of the binding thread, improve the efficiency of use of the binding thread by the binding machine, and further improve the binding efficiency of the binding machine. [Means for solving the problem]

[0007] In order to solve the above technical problems, a first aspect of the present invention discloses a knot control method for a binding machine, the binding machine including a rolling mechanism, a yarn twisting mechanism, a driven yarn feed wheel, a trigger, and a motor for driving and rotating the yarn twisting mechanism, the method comprising: controlling the driven yarn feed wheel to feed the binding yarn to the wrapping mechanism at a predetermined feed amount based on a first input signal generated when a user presses the trigger; controlling the yarn twisting mechanism to twist the binding yarn at a high speed according to a predetermined first speed, and monitoring the output torque of the motor during the yarn twisting process; When the output torque reaches a set value, controlling the yarn twisting mechanism to twist the yarn at a low speed in the same direction for a predetermined number of turns in accordance with a predetermined second speed.

[0008] As an alternative embodiment, in the first aspect of the present invention, monitoring the output torque of the motor during the yarn twisting process comprises: The method further includes monitoring the current of the motor during the yarn twisting process and calculating the output torque based on the current of the motor.

[0009] In an alternative embodiment, in the first aspect of the invention, the method of monitoring that the output torque reaches the set value comprises: The current of the motor during the yarn twisting process is equal to or greater than the initial upper limit current, and the output torque of the motor is determined to reach the set value as a trigger signal; or The method further includes determining, as a trigger signal, a point at which the current value of the motor continues to rise and then starts to fall during the yarn twisting process, at which the output torque of the motor reaches a set value.

[0010] As an alternative embodiment, in a first aspect of the present invention, after monitoring the output torque of the motor during the yarn twisting process, the method further comprises: acquiring a current value of the motor as a first current at a point where the current value of the motor continues to increase and then starts to decrease; determining the first current as a current upper limit current and updating the initial upper limit current; or The method further includes multiplying the first current by a first weight to obtain a first result, multiplying the initial upper limit current by a second weight to obtain a second result, and updating the initial upper limit current by setting the sum of the first result and the second result as a current upper limit current.

[0011] As an optional embodiment, in a first aspect of the present invention, the first speed is set as a maximum yarn twisting speed that the binding machine is allowed to achieve.

[0012] As an optional embodiment, in the first aspect of the present invention, the second speed is set to 20 to 40% of the first speed, and / or The predetermined number of turns is set to 2 to 10 turns.

[0013] As an alternative embodiment, in the first aspect of the present invention, before monitoring the output torque of the motor during the yarn twisting process, the method further comprises: The current of the motor is monitored in real time when the binding machine performs multiple tying operations, and when it is detected that the current value continues to rise and then starts to fall during each tying process, the current value of the motor at the start of descent is acquired; The method further includes determining an average value of all the motor current values ​​obtained during the tying process as an initial upper limit current, or determining a minimum value of all the motor current values ​​obtained during the tying process as an initial upper limit current.

[0014] A second aspect of the present invention discloses a computer storage medium having computer instructions stored thereon for performing steps in the knotting control method when the computer instructions are invoked.

[0015] A third aspect of the present invention discloses a binding machine, characterized in that it is adapted to carry out the steps of the knot control method. [Effects of the Invention]

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] In comparison with the prior art, the embodiment of the present invention continues twisting the binding yarn at a slower speed than the original speed after the strain of the binding yarn reaches a set value, which allows for a tighter twist than a solution that does not continue twisting the yarn, and is less likely to break within the same twisting time than a solution that continues twisting the yarn at the original speed. Therefore, the embodiment of the present invention reduces binding yarn breakage, further tightens the binding yarn, improves the degree of binding yarn tightness, improves the efficiency of binding yarn use by the binding machine, and further improves the binding efficiency of the binding machine. [Brief explanation of the drawings]

[0018] In order to more clearly explain the technical solutions of the embodiments of the present invention, the following briefly describes the drawings necessary for describing the embodiments. Of course, the drawings described below are only examples of the embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without any creative efforts. [Figure 1] FIG. 1 is a schematic flowchart of a method for controlling a knot of a binding machine disclosed in an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing the relationship between the tangential stress and strain of the binding yarn in the yarn twisting process disclosed in the examples of the present invention. [Figure 3]FIG. 3 is a schematic diagram showing the relationship between the output torque of the motor of the binding machine and time in the yarn twisting process disclosed in the embodiment of the present invention. [Figure 4] FIG. 4 is a schematic flowchart of another method for controlling the knotting of a binding machine disclosed in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Any other embodiments that those skilled in the art can obtain based on the embodiments of the present invention without any inventive efforts fall within the protection scope of the present invention.

[0020] Example 1 Referring to Figure 1, Figure 1 is a schematic flowchart of a knot control method for a binding machine disclosed in an embodiment of the present invention. The binding machine includes a rounding mechanism, a yarn twisting mechanism, a driving yarn feed wheel, a trigger, and a motor for driving and rotating the yarn twisting mechanism, and the method includes:

[0021] 101 Based on a first input signal generated by a user pressing the trigger, the driven yarn feed wheel is controlled to feed the binding yarn to the wrapping mechanism at a predetermined feed amount.

[0022] 102 Control the yarn twisting mechanism to twist the binding yarn at high speed according to a predetermined first speed, and monitor the output torque of the motor during the yarn twisting process.

[0023] 103 When the output torque reaches a set value, the yarn twisting mechanism is controlled to twist the yarn at a low speed in the same direction by a predetermined number of turns according to a predetermined second speed.

[0024] In this embodiment, the set value of the output torque is less than or equal to the peak value of the output torque, and the peak value of the output torque may be obtained based on the relationship between the output torque and time when the binding machine twists the yarn.

[0025] When a common tie, such as a steel tie, is twisted, the torque action generates shear stresses across the cross section of the material, and if the tangential stress exceeds the shear strength of the material, the material will break. Figure 2 is a schematic diagram showing the relationship between the tangential stress and strain of the binding yarn during the yarn twisting process. As the yarn twisting process progresses, the amount of strain in the binding yarn gradually increases, but the tangential stress experienced by the binding yarn at the ab segment increases as the amount of strain increases (elastic deformation stage). Figure 3 is a schematic diagram showing the relationship between the output torque of the binding machine motor and time during the yarn twisting process of Figure 2. The ab segment corresponds to the AB segment in Figure 3. At this time, as the load on the binding machine motor increases, the output torque of the motor also increases, and the torque corresponding to time B is the peak value of the output torque. The tangential stress experienced at the bd segment decreases as the amount of strain increases (plastic deformation stage). When the strain reaches dmm, the binding yarn is twisted off. The bd segment corresponds to the BD segment shown in Figure 3. At this stage, the load on the motor begins to decrease, the motor output torque becomes smaller and smaller, and at time D (corresponding to the time of strain dmm in Figure 2), the binding yarn is twisted off.

[0026] For example, as shown in Figure 2, in the prior art, twisting of the binder yarn is stopped after the strain of the binder yarn reaches bmm, or twisting of the yarn continues at the original speed. Compared to the prior art, in the embodiment of the present invention, twisting of the binder yarn continues at a speed slower than the original speed after the strain of the binder yarn reaches a set value (bmm or a value before bmm), which allows for tighter tightening than a solution that does not continue twisting, and is less likely to break through within the same twisting time than a solution that continues twisting at the original speed (if the final strain of the binder yarn in the embodiment of the present invention is cmm as shown in Figure 2, the final strain of the solution that continues twisting of the yarn at the original speed within the same twisting time is greater than cmm, and is closer to and ultimately equal to the corresponding strain dmm when twisting through). Therefore, the embodiment of the present invention reduces the breakage of the binding thread, further tightens the binding thread, improves the degree of tightening of the binding thread, improves the efficiency of binding thread use by the binding machine, and further improves the binding efficiency of the binding machine.

[0027] In an alternative embodiment, reference is made to FIG. 4, which is a schematic flow chart of another method for controlling a knot of a strapping machine disclosed in an embodiment of the present invention, the method including:

[0028] 201 Based on a first input signal generated by a user pressing the trigger, the driven yarn feed wheel is controlled to feed the binding yarn to the wrapping mechanism at a predetermined feed amount.

[0029] 202 Control the yarn twisting mechanism to twist the binding yarn at high speed according to a predetermined first speed, monitor the current of the motor during the yarn twisting process, and calculate the output torque based on the current of the motor.

[0030] 203 When the output torque reaches a set value, the yarn twisting mechanism is controlled to twist the yarn at a low speed in the same direction by a predetermined number of turns according to a predetermined second speed.

[0031] Knowing that the motor current is directly proportional to the output torque, the output torque can be obtained by taking the motor current and multiplying it by a correlation coefficient. This alternative embodiment can monitor the output torque by taking the motor current and calculating the output torque.

[0032] In another alternative embodiment, before monitoring the output torque of the motor during the yarn twisting process, the method further comprises: The current of the motor is monitored in real time when the binding machine performs multiple tying operations, and when it is detected that the current value of the motor continues to increase and then starts to decrease during each tying process, the current value of the motor at the start of descent is acquired; The method further includes determining an average value of all the motor current values ​​obtained during the tying process as an initial upper limit current, or determining a minimum value of all the motor current values ​​obtained during the tying process as an initial upper limit current.

[0033] Since the motor current is directly proportional to the output torque, when the motor current value continues to rise and then starts to fall, it can be considered to be entering the BD stage in Figure 3, and the output torque corresponding to point B is the output torque peak value. This alternative embodiment can reduce errors by setting the initial upper limit current as the average value of the motor current when the output torque peaks in multiple knotting steps, or can significantly reduce the possibility of breakage by setting the initial upper limit current as the minimum value of the motor current when the output torque peaks in multiple knotting steps.

[0034] In another alternative embodiment, the method of monitoring the output torque reaching the set point may include: The method further includes determining that the output torque of the motor reaches a set value using the current of the motor during the yarn twisting process being equal to or greater than an initial upper limit current as a trigger signal.

[0035] In another alternative embodiment, the method of monitoring the output torque reaching the set point may include: The method may further include determining, as a trigger signal, a point at which the current value of the motor continues to rise and then starts to fall during the yarn twisting process, when the output torque of the motor reaches a set value.

[0036] In this alternative embodiment, since the motor current is directly proportional to the output torque, when the motor current value continues to rise and then starts to fall, this can be considered to be the BD stage in FIG. 3, and the output torque corresponding to the start of the fall, i.e., point B, is the output torque peak value.

[0037] In another alternative embodiment, after monitoring the output torque of the motor during the yarn twisting process, the method further comprises: acquiring a current value of the motor as a first current at a point where the current value of the motor continues to increase and then starts to decrease; determining the first current as a current upper limit current and updating the initial upper limit current; or The method further includes multiplying the first current by a first weight to obtain a first result, multiplying the initial upper limit current by a second weight to obtain a second result, and updating the initial upper limit current by setting the sum of the first result and the second result as a current upper limit current.

[0038] In this optional embodiment, after determining the initial upper limit current, if the material changes slightly during actual use due to some causes (e.g., long-term storage, environmental changes, etc.), the initial upper limit current may be further adaptively updated. By monitoring the start of descent and updating the initial upper limit current based on the current corresponding to the latest start of descent, the latest yarn twist data can be referred to and adapted to the current situation, thereby improving the adaptability of yarn twisting by the binding machine.

[0039] In another alternative embodiment, the first speed is set as the maximum yarn twist speed allowed by the binding machine.

[0040] In other alternative embodiments, the second speed is set to 20 to 40% of the first speed, and / or the predetermined number of turns is set to 2 to 10 turns.

[0041] In this optional embodiment, the time used to twist the maximum number of turns out of the specified number of turns at the maximum speed of the second speed is less than the time corresponding to the BD segment in Figure 3, which can further tighten the object to be bound while reducing the risk of the binding thread breaking.

[0042] <Example 2> A computer storage medium having computer instructions stored therein, the computer instructions being for performing the steps of the knotting control method described in Example 1 when invoked.

[0043] Example 3 A binding machine for performing the steps of the knot control method described in Example 1.

[0044] The contents disclosed in the embodiments of the present invention merely disclose preferred embodiments of the present invention and are intended to explain the technical solutions of the present invention, not to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that they may still modify the technical solutions described in the above embodiments or equivalently replace some of the technical features therein, but such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A knotting control method for a binding machine including a rolling mechanism, a yarn twisting mechanism, a driven yarn feed wheel, a trigger, and a motor that drives and rotates the yarn twisting mechanism, controlling the driven yarn feed wheel to feed the binding yarn to the wrapping mechanism at a predetermined feed amount based on a first input signal generated when a user presses the trigger; controlling the yarn twisting mechanism to twist the binding yarn at a high speed in accordance with a predetermined first speed, and monitoring the output torque of the motor during the yarn twisting process; When the output torque reaches a set value, controlling the yarn twisting mechanism to twist the yarn at a low speed in the same direction for a predetermined number of turns in accordance with a predetermined second speed.

2. Monitoring the output torque of the motor during the yarn twisting process includes:

2. The knotting control method according to claim 1, further comprising: monitoring a current of the motor during a line twisting process; and calculating the output torque based on the current of the motor.

3. The method for monitoring whether the output torque reaches the set value is as follows: The current of the motor during the yarn twisting process is equal to or greater than the initial upper limit current, and the output torque of the motor is determined to reach the set value as a trigger signal; or 3. The knotting control method according to claim 2, further comprising determining, as a trigger signal, a point at which the current value of the motor continues to increase and then starts to decrease during the line twisting process, when the output torque of the motor reaches a set value.

4. After monitoring the output torque of the motor during the yarn twisting process, the method includes: acquiring, as a first current, a current value of the motor at a point where the current value of the motor continues to increase and then starts to decrease; determining the first current as a current upper limit current and updating the initial upper limit current; or 4. The method of claim 3, further comprising: multiplying the first current by a first weight to obtain a first result; multiplying the initial upper limit current by a second weight to obtain a second result; and updating the initial upper limit current by a sum of the first result and the second result as a current upper limit current.

5. 2. The knot control method according to claim 1, wherein the first speed is set as a maximum yarn twisting speed allowed by the binding machine.

6. the second speed is set to 20-40% of the first speed; and / or 5. The method for controlling a knot according to claim 1, wherein the predetermined number of turns is set to 2 to 10 turns.

7. Before monitoring the output torque of the motor during the yarn twisting process, the method includes: The current of the motor is monitored in real time when the binding machine performs multiple tying operations, and when it is detected that the current value of the motor continues to increase and then starts to decrease during each tying process, the current value of the motor at the start of descent is acquired; 5. The method for controlling the knot according to claim 3, further comprising determining an average value of all current values ​​of the motor acquired during the knotting process as an initial upper limit current, or determining a minimum value of all current values ​​of the motor acquired during the knotting process as an initial upper limit current.

8. 1. A computer storage medium, comprising: A computer storage medium having computer instructions stored therein, the computer instructions being for performing the steps of the knotting control method according to any one of claims 1 to 7 when called.

9. A binding machine, A binding machine for carrying out the steps of the knot control method according to any one of claims 1 to 7.

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