Wire-feeding motor braking control method

Abstract

The application discloses a wire feeding motor braking control method, and belongs to the technical field of gas shielded welding with a consumable electrode. The method comprises the following steps: when a welding machine is performing welding, a wire feeding motor is controlled to perform wire feeding; when the welding machine stops welding, the wire feeding motor is controlled to perform braking; during the process that the wire feeding motor performs braking, when the driving current of the wire feeding motor is less than a current threshold, the wire feeding motor is controlled to stop braking and switch to performing back-pulling; during the process that the wire feeding motor performs back-pulling, when the driving current of the wire feeding motor is greater than the current threshold, the wire feeding motor is controlled to stop back-pulling and switch to performing braking; according to the driving current of the wire feeding motor, the wire feeding motor is repeatedly switched between performing braking and performing back-pulling until the wire feeding direction of the wire feeding motor changes, and then the wire feeding motor is controlled to perform braking and stop switching. The method can reduce the discreteness of a wire feeding loop and improve the stability of a welding after-burning timing.

Description

Technical Field

[0001] The invention relates to a wire feeding motor braking control method, belonging to the technical field of consumable electrode gas shielded welding. Background Art

[0002] In the actual application of metal-metal oxide gas welding, after the welding machine stops welding and enters the burn-back sequence, the wire feeding motor is braked. Affected by the wire feeding circuit, the braking process of the wire feeding motor will have a certain degree of discreteness. In severe cases, it will cause a large discreteness in the burn-back, resulting in inconsistent sizes of the molten ball at the end of the welding wire, inconsistent lengths of the welding wire extension, and even wire sticking problems.

[0003] The factors that cause discreteness in the wire feeding circuit mainly include the performance of the wire feeding motor and the resistance of the wire feeding circuit. The performance of the wire feeding motor mainly includes the inertia of the wire feeding motor and the driving torque. The resistance of the wire feeding circuit mainly includes the age, length, coiling of the wire tube and the bending degree of the welding gun neck. In particular, the inertia of the wire feeding motor and the resistance of the wire feeding circuit have the greatest effect. The large inertia of the motor causes the braking time to be prolonged, or the wire feeding circuit resistance is inconsistent when welding at different angles, which can easily increase the discreteness of welding burnback. Typical problems caused by discreteness include: inconsistent size of the molten ball at the end of the welding wire and inconsistent length of the welding wire extension. If the molten ball at the end of the welding wire is too large, it will affect the smoothness of the re-arcing. If the welding wire extension is too long, the top wire of the re-arcing will break, and even cause the welding wire to stick to the base material. Summary of the Invention

[0004] The object of the present invention is to provide a wire feeding motor brake control method, which can reduce the discreteness of the wire feeding circuit and improve the stability of the welding burn-back sequence.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a wire feeding motor brake control method, comprising:

[0007] When the welding machine performs welding, the wire feeding motor is controlled to perform wire feeding;

[0008] When the welding machine stops welding, the wire feeding motor is controlled to perform braking;

[0009] During the braking process of the wire feeding motor, when the driving current of the wire feeding motor is less than the current threshold, the wire feeding motor is controlled to stop braking and switch to back-pulling;

[0010] During the back-pulling process of the wire feeding motor, when the driving current of the wire feeding motor is greater than the current threshold, the wire feeding motor is controlled to stop back-pulling and switch to braking;

[0011] According to the driving current of the wire feeding motor, the wire feeding motor is controlled to repeatedly switch between braking and back-pulling until the wire feeding direction of the wire feeding motor changes, and the wire feeding motor is controlled to brake and stop switching.

[0012] In combination with the first aspect, further, the current threshold is less than or equal to 75% of the rated current of the wire feeding motor.

[0013] In combination with the first aspect, further, the wire feeding motor uses a fixed duty cycle to perform back-pulling.

[0014] In combination with the first aspect, further, the duty cycle is less than or equal to 10%.

[0015] In combination with the first aspect, further, the duration of the wire feeding motor performing back-pulling is less than or equal to 140% of the duration of the wire feeding motor performing braking; the total time of the wire feeding motor performing braking is less than or equal to the maximum time threshold.

[0016] In combination with the first aspect, further, the wire feeding direction of the wire feeding motor changes includes: the wire feeding direction of the wire feeding motor changes from forward wire feeding to reverse wire feeding, or the wire feeding direction of the wire feeding motor changes from reverse wire feeding to forward wire feeding.

[0017] In a second aspect, the present invention provides a wire feeding motor, wherein the wire feeding motor is brake controlled by the wire feeding motor brake control method as described in any one of the first aspects.

[0018] In combination with the second aspect, further, the wire feeding motor adopts H-bridge drive and orthogonal encoder feedback, and the wire feeding motor has forward driving function, reverse driving function and wire feeding direction determination function.

[0019] In a third aspect, the present invention provides a welding machine, wherein the welding machine adopts a wire feeding motor to feed wire, and the wire feeding motor adopts the wire feeding motor braking control method as described in any one of the first aspects for braking control.

[0020] In combination with the third aspect, further, the wire feeding motor adopts H-bridge drive and orthogonal encoder feedback, and the wire feeding motor has forward driving function, reverse driving function and wire feeding direction determination function.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The wire feeding motor braking control method provided by the present invention adopts appropriate back-pulling action during the braking process of the wire feeding motor to achieve timing compression of the entire braking process, which can effectively reduce the impact of the discreteness of the wire feeding circuit and improve the stability of the welding burn-back timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of the wire feeding motor braking control method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present application will be further described in detail below in conjunction with specific implementation methods.

[0025] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. The embodiments of the present application and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0026] Example 1:

[0027] This embodiment provides a wire feeding motor brake control method. Figure 1 This is a flow chart of the wire feeding motor brake control method provided in this embodiment. This flow chart only shows the logical sequence of the method of this embodiment. Under the premise of no conflict, different Figure 1 The steps shown or described are accomplished in the order shown.

[0028] like Figure 1 As shown, the wire feeding motor braking control method provided in this embodiment includes:

[0029] When the welding machine performs welding, the wire feeding motor is controlled to perform wire feeding;

[0030] When the welding machine stops welding, the wire feeding motor is controlled to perform braking;

[0031] During the braking process of the wire feeding motor, when the driving current of the wire feeding motor is less than the current threshold, the wire feeding motor is controlled to stop braking and switch to back-pulling;

[0032] During the back-pulling process of the wire feeding motor, when the driving current of the wire feeding motor is greater than the current threshold, the wire feeding motor is controlled to stop back-pulling and switch to braking;

[0033] According to the driving current of the wire feeding motor, the wire feeding motor is controlled to repeatedly switch between braking and back-pulling until the wire feeding direction of the wire feeding motor changes, and the wire feeding motor is controlled to brake and stop switching.

[0034] The wire feeding motor braking control method provided in this embodiment adopts appropriate back-pulling action during the braking process of the wire feeding motor, which can effectively reduce the impact of the discreteness of the wire feeding circuit and improve the stability of the welding burn-back timing. In particular, for wire feeding motors with large inertia, short wire feeding tubes or straight-tube welding guns, the effect is more obvious, and can effectively control the size of the molten ball at the end of the welding wire and the dry extension length of the welding wire during the welding burn-back process, thereby avoiding the welding wire from sticking to the base material.

[0035] Example 2:

[0036] This embodiment provides a wire feeding motor brake control method, based on embodiment 1, as shown in FIG. Figure 1 As shown, the wire feeding motor braking control method provided in this embodiment specifically includes the following steps:

[0037] Step 1: Determine whether the welding machine stops welding. If the welding machine stops welding, the wire feeding motor is controlled to perform braking and enter step 2. Otherwise, the wire feeding motor is controlled to perform wire feeding and step 1 is repeated.

[0038] Step 2: Determine whether the driving current of the wire feeding motor is less than the current threshold. If the driving current of the wire feeding motor is less than the current threshold, control the wire feeding motor to stop braking and switch to back-pulling, and enter step 3. Otherwise, repeat step 2.

[0039] Step 3: Determine whether the wire feeding direction of the wire feeding motor has changed. If the wire feeding direction of the wire feeding motor has changed, proceed to step 5; otherwise, proceed to step 4.

[0040] Step 4: Determine whether the driving current of the wire feeding motor is greater than the current threshold. If the driving current of the wire feeding motor is greater than the current threshold, control the wire feeding motor to stop backfeeding and switch to braking, and return to step 2; otherwise, return to step 3;

[0041] Step 5: Control the wire feeding motor to stop back-pulling and switch to braking until the wire feeding motor completes braking, and then end the control.

[0042] Specifically, when the welding machine stops welding, the wire feeding motor is controlled to perform braking. During the process of the wire feeding motor performing braking, the driving current of the wire feeding motor is monitored. When the driving current of the wire feeding motor is less than the current threshold, the wire feeding motor is controlled to stop braking and switch to performing back-pulling. During the process of the wire feeding motor performing back-pulling, the driving current of the wire feeding motor is monitored. When the driving current of the wire feeding motor is greater than the current threshold, the wire feeding motor is controlled to stop back-pulling and switch to performing braking. According to the driving current of the wire feeding motor, the wire feeding motor is controlled to switch back and forth between performing braking and performing back-pulling. During the process of switching back and forth between performing braking and performing back-pulling, the wire feeding direction of the wire feeding motor is monitored. Once the wire feeding direction of the wire feeding motor changes, the wire feeding motor is controlled to stop back-pulling and switch to performing braking. Later, it will no longer switch to performing back-pulling until the wire feeding motor completes braking.

[0043] It should be noted that the wire feeding motor can only perform back-pulling when the acceleration of the wire feeding motor decreases to 0. During normal welding, the wire feeding motor also maintains normal wire feeding and does not perform back-pulling.

[0044] Figure 1 In the figure, I represents the driving current of the wire feeding motor, and Ix represents the current threshold.

[0045] Example 3:

[0046] This embodiment provides a wire feeding motor braking control method. Based on the first embodiment, the current threshold is less than or equal to 75% of the rated current of the wire feeding motor.

[0047] In this embodiment, during the entire braking control process of the wire feeding motor, the driving current of the wire feeding motor is constantly monitored and controlled within the electrical allowable range of the wire feeding motor to avoid damage to the wire feeding motor.

[0048] Example 4:

[0049] This embodiment provides a wire feeding motor braking control method. Based on the first embodiment, the wire feeding motor uses a fixed duty cycle to perform back-pulling.

[0050] In this embodiment, the duty cycle is less than or equal to 10%.

[0051] Example 5:

[0052] This embodiment provides a wire feeding motor braking control method. Based on Example 1, the duration of the wire feeding motor performing backpulling is less than or equal to 140% of the duration of the wire feeding motor performing braking; the total time of the wire feeding motor performing braking is less than or equal to the maximum time threshold.

[0053] In this embodiment, the duration of the wire feeding motor performing back-pulling is controlled not to exceed 140% of the duration of the wire feeding motor performing braking, and the total time of the wire feeding motor performing braking is controlled not to exceed the maximum time threshold, so as to avoid continuous back-pulling abnormalities due to external interference.

[0054] Specifically, the duration of the wire feeding motor performing back-pulling is controlled to not exceed 140% of the duration of the wire feeding motor performing pure braking, wherein the duration of the wire feeding motor performing pure braking refers to the duration of the wire feeding motor performing braking in the existing braking control method without back-pulling action.

[0055] The wire feeding motor braking control method provided in this embodiment limits the total duration of the wire feeding motor's back-pulling to a certain range during the entire braking control process of the wire feeding motor. This can solve the problem of abnormality caused by errors in the direction signal during the wire feeding motor's back-pulling process or when the wire feeding motor only supports single-channel encoder feedback.

[0056] Example 6:

[0057] This embodiment provides a wire feeding motor braking control method. Based on embodiment 1, the wire feeding direction of the wire feeding motor changes, including: the wire feeding direction of the wire feeding motor changes from forward wire feeding to reverse wire feeding, or the wire feeding direction of the wire feeding motor changes from reverse wire feeding to forward wire feeding.

[0058] Specifically, in the process of switching back and forth between braking and back-pulling of the wire feeding motor, the wire feeding direction of the wire feeding motor is monitored. Once the wire feeding direction of the wire feeding motor changes, for example, from the original forward wire feeding to reverse wire feeding, or from the original reverse wire feeding to forward wire feeding, the wire feeding motor is controlled to stop back-pulling and switch to braking. Later, it will no longer switch to back-pulling until the wire feeding motor completes braking.

[0059] Example 7:

[0060] This embodiment provides a wire feeding motor, which performs braking control using the wire feeding motor braking control method provided in any one of Embodiments 1 to 6 of the present application.

[0061] In this embodiment, the wire feeding motor adopts H-bridge drive and orthogonal encoder feedback, and the wire feeding motor has forward driving function, reverse driving function and wire feeding direction determination function.

[0062] Specifically, the wire feed motor uses an orthogonal encoder feedback method to determine the wire feed direction. The wire feed motor uses an H-bridge drive method and has both forward and reverse drive functions.

[0063] Example 8:

[0064] This embodiment provides a welding machine, which uses a wire feeding motor to feed wire, and the wire feeding motor uses the wire feeding motor braking control method provided in any one of Examples 1 to 6 of this application to perform braking control.

[0065] In this embodiment, the wire feeding motor adopts H-bridge drive and orthogonal encoder feedback, and the wire feeding motor has forward driving function, reverse driving function and wire feeding direction determination function.

[0066] Specifically, the wire feed motor uses an orthogonal encoder feedback method to determine the wire feed direction. The wire feed motor uses an H-bridge drive method and has both forward and reverse drive functions.

[0067] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A wire feeding motor brake control method, characterized in that: include: When the welding machine performs welding, the wire feeding motor is controlled to perform wire feeding; When the welding machine stops welding, the wire feeding motor is controlled to perform braking; During the braking process of the wire feeding motor, when the driving current of the wire feeding motor is less than the current threshold, the wire feeding motor is controlled to stop braking and switch to back-pulling; During the back-pulling process of the wire feeding motor, when the driving current of the wire feeding motor is greater than the current threshold, the wire feeding motor is controlled to stop back-pulling and switch to braking; According to the driving current of the wire feeding motor, the wire feeding motor is controlled to repeatedly switch between braking and back-pulling until the wire feeding direction of the wire feeding motor changes, and the wire feeding motor is controlled to brake and stop switching.

2. The wire feeding motor brake control method according to claim 1, characterized in that: The current threshold is less than or equal to 75% of the rated current of the wire feeding motor.

3. The wire feeding motor brake control method according to claim 1, characterized in that: The wire feeding motor performs back-pulling with a fixed duty cycle.

4. The wire feeding motor brake control method according to claim 3, characterized in that: The duty cycle is less than or equal to 10%.

5. The wire feeding motor brake control method according to claim 1, characterized in that: The duration of the wire feeding motor performing back-pulling is less than or equal to 140% of the duration of the wire feeding motor performing braking; the total time of the wire feeding motor performing braking is less than or equal to the maximum time threshold.

6. The wire feeding motor brake control method according to claim 1, characterized in that: The change in the wire feeding direction of the wire feeding motor includes: the wire feeding direction of the wire feeding motor changes from forward wire feeding to reverse wire feeding, or the wire feeding direction of the wire feeding motor changes from reverse wire feeding to forward wire feeding.

7. A wire feeding motor, characterized in that: The wire feeding motor is brake controlled by the wire feeding motor brake control method according to any one of claims 1 to 6.

8. The wire feeding motor according to claim 7, characterized in that: The wire feeding motor adopts H-bridge drive and orthogonal encoder feedback, and the wire feeding motor has forward driving function, reverse driving function and wire feeding direction judgment function.

9. A welding machine, wherein the welding machine adopts a wire feeding motor to feed wire, characterized in that: The wire feeding motor is brake controlled by the wire feeding motor brake control method according to any one of claims 1 to 6.

10. The welding machine according to claim 9, characterized in that The wire feeding motor adopts H-bridge drive and orthogonal encoder feedback, and the wire feeding motor has forward driving function, reverse driving function and wire feeding direction judgment function.

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