KNOTTING CONTROL METHOD FOR BINDING MACHINE

TECHNICAL FIELD

[0001]The present invention relates to the technical field of binding machines, in particular to a knotting control method for binding machine.

BACKGROUND TECHNOLOGY

[0002]The binding machine is a device for enwinding, fixing and tightening an object by bending a binding wire. As described in Patent CN 111706084 A, the binding machine includes a curve forming portion (i.e., a rounding mechanism), a twisting unit (i.e., a wire twisting mechanism), a feeding unit (i.e., wire feeding wheels, including a driving wire feeding wheel and a driven wire feeding wheel), a binding trigger (i.e., a trigger) and other structures, wherein, after the binding wire enwound and fixed an object, the binding machine tightens the object by twisting and knotting two ends of the binding wire.

[0003]In actual use, during twisting and knotting the binding wire by the binding machine, the knotting parameters are generally set by artificial experience. However, when the knotting parameters are set too loose, as a result of knotting, it may be not tight enough, and it is necessary to perform binding and tightening again, resulting in waste; moreover, it may also take multiple attempts to tighten again to ensure that it is tightened without twisting off the binding wire. When the knotting parameters are set too tight, as a result of knotting, the binding wire may be twisted off, which is very dangerous; and, it is necessary to perform binding again, resulting in waste.

[0004]Therefore, how to realize accurate knotting of a binding machine is very important.

SUMMARY OF THE PRESENT INVENTION

[0005]The technical problem to be solved by the present invention is to provide a knotting control method for a binding machine, which can further tighten a binding wire while reducing the breakage of the binding wire, thereby improving the tightening extent of the binding wire, improving the efficiency of the binding machine in using the binding wire and improving the binding efficiency of the binding machine.

[0019]As an optional implementation, in the first aspect of the present invention, the first speed is configured as a maximum wire twisting speed allowed by the binding machine.

[0020]As an optional implementation, in the first aspect of the present invention, the second speed is configured to be 20% to 40% of the first speed, and/or

[0021]The preset number of turns is configured to be 2 to 10 turns.

[0025]In a second aspect of the present invention, a computer storage medium is disclosed, wherein, the computer storage medium has computer instructions stored thereon that, when computer instructions are invoked, they are used to execute the steps in the knotting control method described above.

[0026]In a third aspect of the present invention, a binding machine is disclosed, wherein, it is used to execute the steps in the knotting control method described above.

BRIEF DESCRIPTION OF THE DRAWINGS

[0029]To describe the technical solutions in the embodiments of the present invention more clearly, the drawings to be used in the description of the embodiments will be briefly introduced below. Apparently, the drawings in the following description are only some of the embodiments of the present invention, and a person of ordinary skill in the art can obtain other drawings according to these drawings without paying any creative effort.

[0030]FIG. 1 is a schematic flowchart of a knotting control method for a binding machine according to an embodiment of the present invention;

[0031]FIG. 2 is a schematic diagram of the relationship between the tangential stress and strain of the binding wire in the wire twisting process according to an embodiment of the present invention;

[0032]FIG. 3 is a schematic diagram of the relationship between the output torque of the motor of the binding machine and the time in the wire twisting process according to an embodiment of the present invention; and

[0033]FIG. 4 is a schematic flowchart of another knotting control method for a binding machine according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0034]To make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some but not all of the embodiments of the present invention. All other embodiments obtained on the basis of the embodiments in the present invention by a person of ordinary skill in the art without paying any creative effort shall fall into the protection scope of the present invention.

Embodiment 1

[0039]In this embodiment, the set value of the output torque is less than or equal to the peak value of the output torque, wherein the peak value of the output torque can be obtained according to the relationship between the output torque and the time during twisting the binding wire by the binding machine.

[0040]For common binding wires such as binding wires made of steel, when being twisted, shear stress will be generated on the cross section of the material due to the effect of torque. When the tangential stress exceeds the shear strength of the material, the material will break. FIG. 2 shows a schematic diagram of the relationship between the tangential stress and strain of the binding wire in the wire twisting process. The strain of the binding wire increases gradually along with the proceeding of the wire twisting process, and the tangential stress of the binding wires in the section ab increases along with the increase of the strain (elastic deformation stage). FIG. 3 shows a schematic diagram of the relationship between the output torque of the motor of the binding machine and the time in the wire twisting process of FIG. 2. The section ab corresponds to the section AB in FIG. 3. At this time, the load of the motor of the binding machine is increasingly larger, and the output torque of the motor is also increasingly larger. The torque corresponding to the time B is the peak value of the output torque. The tangential stress in the section bd decreases along with the increase of the strain (plastic deformation stage) until the binding wire is twisted off when the strain is d mm, wherein the section bd corresponds to the section BD in FIG. 3. In this stage, the load of the motor starts to decrease, and the output torque of the motor is increasingly smaller, until the binding wire is twisted off at the moment D (corresponding to the moment when the strain is d mm in FIG. 2).

[0041]For example, as shown in FIG. 2, in the prior art, after the strain of the binding wire reaches b mm, the wire twisting will be stopped or the wire will be continuously twisted at the original speed. Compared with the prior art, in this embodiment of the present invention, after the strain of the binding wire reaches the set value (b mm or a value before b mm), the wire will be continuously twisted at a speed lower than the original speed, so that the binding wire can be twisted more tightly in comparison to the scheme of not continuously twisting the wire, and the binding wire is less likely to be twisted off under the same wire twisting time in comparison to the scheme of continuously twisting the wire at the original speed (if the final strain of the binding wire in the embodiment of the present invention is c mm as shown in FIG. 2, the final strain in the scheme of continuously twisting the wire at the original speed under the same wire twisting time will be greater than c mm, or even closer or equal to the strain d mm corresponding to the situation where the wire is twisted off). Therefore, this embodiment of the present invention can further tighten the binding wire while reducing the breakage of the binding wire, thereby improving the tightening extent of the binding wire, improving the efficiency of the binding machine in using the binding wire and improving the binding efficiency of the binding machine.

[0046]In the knowledge of motors, the current of the motor is directly proportional to the output torque, and the output torque can be obtained by multiplying the current of the motor by a relevant coefficient. In this optional embodiment, the output torque is calculated by acquiring the current of the motor, and the output torque can be monitored by the current of the motor.

[0050]Since the current of the motor is directly proportional to the output torque, when the current value of the motor starts to drop after continuous rise, it can be regarded as entering the BD stage in FIG. 3, wherein, the output torque corresponding to the point B is the peak value of the output torque. In this optional embodiment, by setting the average value of the current values of the motor at the peak values of the output torque in multiple knotting processes as the initial upper limit current, the error can be reduced; or, by setting the lowest value of the current values of the motor at the peak values of the output torque in multiple knotting processes as the initial upper limit current, the possibility of breakage can be greatly reduced.

[0055]In this optional embodiment, since the current of the motor is directly proportional to the output torque, when the current value of the motor starts to drop after continuous rise, it can be regarded as entering the BD stage in FIG. 3, wherein, the output torque corresponding to the drop starting point at which the current starts to drop, i.e., the point B, is the peak value of the output torque.

[0060]In this optional embodiment, after the initial upper limit current is determined, in actual use, the initial upper limit current can be updated adaptively if the material changes slightly for some reasons (e.g., long-term placement, environment change, etc.). By monitoring the drop starting point and updating the initial upper limit current according to the current corresponding to the latest drop starting point, the current situation can be adapted with reference to the latest wire twisting data, thereby improving the adaptability of wire twisting of the binding machine.

[0061]In yet another optional embodiment, the first speed is configured as the maximum wire twisting speed allowed by the binding machine.

[0062]In yet another optional embodiment, the second speed is configured to be 20% to 40% of the first speed, and/or, the preset number of turns is configured to 2 to 10 turns.

[0063]In this optional embodiment, the time required by twisting the binding wire at the maximum value of the second speed for the maximum value of the preset number of turns is less than the time corresponding to the section BD in FIG. 3, so that the breakage of the binding wire can be reduced on the basis of further tightening the bound object.

Embodiment 2

[0064]A computer storage medium is provided, wherein, the computer storage medium has computer instructions stored thereon that, when computer instructions are invoked, they are used to execute the steps in the knotting control method described in Embodiment 1.

Embodiment 3

[0065]A binding machine is provided, it is used to execute the steps in the knotting control method described in Embodiment 1.

[0066]The disclosure in the embodiments of the present invention merely shows the preferred embodiments of the present invention, and is only used for illustrating the technical solutions of the present invention, rather than limiting the present invention. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by a person of ordinary skill in the art that the technical solutions described in the above embodiments can still be modified, or some technical features can be replaced equivalently. These modifications or replacements do not make the gist of the corresponding technical solutions depart from the spirit and scope of the technical solutions in the embodiments of the present invention.