Striker detection mode of computerized flat knitting machine

Abstract

The invention discloses a needle collision detection mode of a computerized flat knitting machine, which is characterized in that an acceleration detection sensor is arranged on a machine head of the computerized flat knitting machine, and the acceleration detection sensor is in communication connection with a controller of the machine head; wherein when the machine head operates normally, the actual acceleration, detected by the acceleration detection sensor, of the machine head is matched with the theoretical acceleration given by a controller of the machine head, and it is judged that the machine head operates normally; when the machine head collides with the needle, the actual acceleration of the machine head changes due to resistance, abnormal deviation is formed between the actual acceleration and the theoretical acceleration given by a controller of the machine head, and the machine head is judged to collide with the needle; the detection cost can be remarkably saved, compared with previous manual installation, the method is simpler, manpower is saved, and the installation efficiency is improved; and meanwhile, the detection mode provided by the invention is more accurate, false alarm is avoided, and no detection blind area exists, so that the control operation of the computerized flat knitting machine is more stable, and the overall production efficiency of knitting of the flat knitting machine is improved.

Description

Technical Field

[0001] The invention belongs to the control technology of a computerized flat knitting machine, and in particular relates to a needle collision detection method of the computerized flat knitting machine. Background Art

[0002] When the computer flat knitting machine is knitting, the triangle module on the head sampan may collide with the knitting needle on the needle plate due to various reasons. When a needle collision occurs, the machine cannot continue to knit normally and needs to be stopped to replace the collided needles. Some even need to repair the collided triangles. Computer flat knitting machines are usually equipped with needle collision detection devices, which specifically use a vibration sensor attached to the back of the needle plate. The vibration signal is collected through vibration sensing and converted into an electrical signal. The strength of the electrical signal is used to distinguish whether a needle collision has occurred.

[0003] The principle of vibration sensor detection is that the sensor eardrum surface is magnetically adsorbed on the back of the needle plate through the magnetic steel. When the needle plate vibrates, the vibration wave is transmitted to the sensor eardrum, and the amplitude of the sensor eardrum vibration is converted into electrical signals of different strengths. The strength of the electrical signal is used to distinguish whether the needle has been struck. This principle determines that the detection range of the needle striker starts from the sensor as the center of the circle and changes from strong to weak. That is, even a very small amplitude at the center of the circle can be detected. The farther away from the center of the circle, the larger the amplitude is required to be detected. Therefore, the middle point between the two sensors becomes the weak area of ​​sensor detection, and even the upper and lower parts of the center are weak. There will be detection blind spots. To solve this problem, the only way is to increase the number of sensors and shorten the distance between sensors, which increases the cost of the sensors. To improve the detection accuracy of needle collision, some companies will increase the number of vibration sensors to 10, which leads to high costs. In addition, during the weaving operation of the computerized flat knitting machine, the needle plate itself is constantly vibrating due to its operation and other reasons. Therefore, the vibration sensor detects the vibration signal at all times, but only uses the control system software and hardware combined with traditional experience to screen and distinguish whether a needle collision has occurred. This method may cause false alarms or will not alarm even if a real needle collision occurs.

[0004] The applicant hopes to solve the above technical problems by seeking technical solutions. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a needle collision detection method for a computer flat knitting machine, which can significantly save detection costs, is simpler than previous manual installation, saves labor, and improves installation efficiency; at the same time, the detection method provided by the present application is more accurate, will not cause false alarms, and has no detection blind spots, making the control operation of the computer flat knitting machine more stable and improving the overall production efficiency of flat knitting machine weaving.

[0006] The technical solution adopted by the present invention is as follows: A needle collision detection method for a computerized flat knitting machine comprises: installing an acceleration detection sensor on the machine head of the computerized flat knitting machine, wherein the acceleration detection sensor is communicatively connected with a controller of the machine head; wherein, when the machine head operates normally, the actual acceleration of the machine head detected by the acceleration detection sensor matches the theoretical acceleration given by the controller of the machine head, and the machine head is judged to operate normally; when the machine head has a needle collision, the actual acceleration of the machine head will change due to resistance, and an abnormal deviation will be formed from the theoretical acceleration given by the controller of the machine head, and the machine head is judged to have a needle collision.

[0007] Preferably, the acceleration refers to the acceleration of the nose in the X-axis direction.

[0008] Preferably, the acceleration detection sensor includes a position sensor and a sensor chip that are communicatively connected, wherein the position sensor is used to detect the head position signal in real time and send the head position signal to the sensor chip, and the sensor chip transmits the head position signal to the controller of the head.

[0009] Preferably, the position sensor is a single-axis, dual-axis or tri-axis accelerometer, wherein the detection axis of the accelerometer includes at least the X-axis.

[0010] Preferably, the model of the position sensor is ADXL345BCCZ.

[0011] Preferably, the sensor chip is a STM32F042F6P6TR chip.

[0012] Preferably, the position sensor and the sensor chip are communicatively connected via an SPI communication protocol.

[0013] Preferably, a MOSI signal line and a MISO signal line for implementing the SPI communication protocol are provided between the position sensor and the sensor chip.

[0014] Preferably, the head reciprocates back and forth in the X-axis direction; wherein, the head has a first end and a second end in the X-axis direction; wherein, the acceleration detection sensor is fixedly installed at the first end or the second end of the head.

[0015] Preferably, when it is determined that a needle striker has occurred in the handpiece, the controller of the handpiece stops the machine and issues a needle striker alarm signal for subsequent maintenance.

[0016] The present application installs an acceleration detection sensor on the head of a computerized flat knitting machine. During operation, when the head is operating normally, the actual acceleration of the head detected by the acceleration detection sensor matches the theoretical acceleration given by the controller of the head, and the head is judged to be operating normally. When the head hits a needle, the actual acceleration of the head will change due to resistance, resulting in an abnormal deviation from the theoretical acceleration given by the controller of the head, and the head is judged to have hit a needle. Compared with the detection method of traditional vibration sensors, the detection method provided by the present application can significantly save detection costs, is simpler than previous manual installation, saves labor, and improves installation efficiency. At the same time, the detection method provided by the present application is more accurate, will not cause false alarms, and has no detection blind spots, so that the control operation of the computerized flat knitting machine is more stable and the overall production efficiency of flat knitting machine weaving is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the needle detection structure of the computerized flat knitting machine under the specific implementation mode of the present application; Figure 2 It is a schematic diagram of the main circuit structure of the acceleration detection sensor in the specific implementation mode of the present application. DETAILED DESCRIPTION

[0018] The embodiment of the present invention discloses a needle collision detection method for a computerized flat knitting machine, wherein an acceleration detection sensor is installed on the machine head of the computerized flat knitting machine, and the acceleration detection sensor is communicatively connected with the controller of the machine head; wherein, when the machine head operates normally, the actual acceleration of the machine head detected by the acceleration detection sensor is in a matching state with the theoretical acceleration given by the controller of the machine head, and the machine head is judged to operate normally; when the machine head has a needle collision, the actual acceleration of the machine head will change due to resistance, and an abnormal deviation will be formed with the theoretical acceleration given by the controller of the machine head, and the machine head is judged to have a needle collision.

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Please refer to Figure 1 and Figure 2 As shown, a needle collision detection method of a computer flat knitting machine is provided, wherein an acceleration detection sensor 2 is installed on a machine head 1 of the computer flat knitting machine, and the acceleration detection sensor 2 is communicatively connected with a controller of the machine head 1. Preferably, in this embodiment, the acceleration refers to the acceleration of the machine head 1 in the X-axis direction; In this embodiment, when the head 1 is operating normally, the actual acceleration of the head 1 detected by the acceleration detection sensor 2 is in a matching state with the theoretical acceleration given by the controller of the head 1, and the head 1 is judged to be operating normally; when the head 1 has a striker, the actual acceleration of the head 1 will change due to resistance (to be more specific, when the head 1 has a striker, the movement of the head 1 will be significantly sluggish or even completely stuck, and at this time the actual acceleration of the head 1 will be significantly different from the theoretical acceleration given by the controller), forming an abnormal deviation from the theoretical acceleration given by the controller of the head 1, and it is judged that the head 1 has a striker.

[0021] Preferably, in this embodiment, the head 1 reciprocates back and forth in the X-axis direction; wherein the head 1 has a first end 1a of the head 1 and a second end 1b of the head 1 in the X-axis direction; wherein the acceleration detection sensor 2 is fixedly installed on the first end 1a of the head 1 or the second end 1b of the head 1; specifically, in this embodiment, the acceleration detection sensor 2 is fixedly installed on the second end 1b of the head 1.

[0022] Preferably, in this embodiment, when it is determined that a striker occurs in the handpiece 1, the controller of the handpiece 1 stops running and sends a striker alarm signal for subsequent maintenance.

[0023] Preferably, in this embodiment, the acceleration detection sensor 2 includes a position sensor 2a and a sensor chip that are communicatively connected, wherein the position sensor 2a is used to detect the position signal of the head 1 in real time and send the position signal of the head 1 to the sensor chip, and the sensor chip transmits the position signal of the head 1 to the controller of the head 1; Preferably, in this embodiment, the position sensor 2a is a single-axis, dual-axis or tri-axis accelerometer, wherein the detection axis of the accelerometer includes at least the X-axis.

[0024] Specifically preferably, in this embodiment, the model of the position sensor 2a is ADXL345BCCZ, which is a three-axis MEMS accelerometer. This accelerometer can measure acceleration in three directions of X-axis, Y-axis and Z-axis, and has the characteristics of high resolution and low power consumption. It can support multiple measurement ranges, including ±2g, ±4g, ±8g and ±16g, and is suitable for various application scenarios; Specifically preferably, in this embodiment, the sensor chip adopts STM32F042F6P6TR chip; Preferably, in this embodiment, the position sensor 2a and the sensor chip 2b are connected to each other through the SPI communication protocol; further preferably, in this embodiment, a MOSI (Master Output / Slave Input) signal line ( ) for implementing the SPI (Serial Peripheral interface) communication protocol is provided between the position sensor 2a and the sensor chip 2b. Figure 2 13 pin) and MISO (Master Input / Slave Output) signal line ( Figure 2 12 as shown).

[0025] Compared with the detection method of traditional vibration sensors, the detection method provided by this embodiment can significantly save detection costs. It is simpler than previous manual installation, saves labor, and improves installation efficiency. At the same time, the detection method provided by the embodiment is more accurate, will not cause false alarms, and has no detection blind spots, making the control operation of the computer flat knitting machine more stable and improving the overall production efficiency of flat knitting.

[0026] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A needle collision detection method for a computerized flat knitting machine, characterized in that: An acceleration detection sensor is installed on the head of the computer flat knitting machine, and the acceleration detection sensor is communicatively connected with the controller of the head; wherein, when the head is operating normally, the actual acceleration of the head detected by the acceleration detection sensor is in a matching state with the theoretical acceleration given by the controller of the head, and the head is judged to be operating normally; when the head hits a needle, the actual acceleration of the head will change due to resistance, forming an abnormal deviation from the theoretical acceleration given by the controller of the head, and the head is judged to have hit a needle.

2. According to the needle collision detection method of the computerized flat knitting machine according to claim 1, it is characterized in that: The acceleration refers to the acceleration of the nose in the X-axis direction.

3. According to the needle collision detection method of the computerized flat knitting machine according to claim 1, it is characterized in that: The acceleration detection sensor includes a position sensor and a sensor chip that are communicatively connected, wherein the position sensor is used to detect a head position signal in real time and send the head position signal to the sensor chip, and the sensor chip transmits the head position signal to a controller of the head.

4. According to the needle collision detection method of the computerized flat knitting machine according to claim 3, it is characterized in that: The position sensor is a single-axis, dual-axis or tri-axis accelerometer, wherein the detection axis of the accelerometer includes at least the X-axis.

5. The needle collision detection method of the computerized flat knitting machine according to claim 3 or 4, characterized in that: The model of the position sensor is ADXL345BCCZ.

6. According to the needle collision detection method of the computerized flat knitting machine as claimed in claim 3, it is characterized in that: The sensor chip adopts STM32F042F6P6TR chip.

7. The needle collision detection method of the computerized flat knitting machine according to claim 3 is characterized in that: The position sensor and the sensor chip are connected to each other through the SPI communication protocol.

8. The needle collision detection method of the computerized flat knitting machine according to claim 7 is characterized in that: A MOSI signal line and a MISO signal line for implementing the SPI communication protocol are arranged between the position sensor and the sensor chip.

9. The needle collision detection method of the computerized flat knitting machine according to claim 3 is characterized in that: The head reciprocates back and forth in the X-axis direction; wherein, the head has a first end and a second end in the X-axis direction; wherein, the acceleration detection sensor is fixedly installed at the first end or the second end of the head.

10. The needle collision detection method of the computerized flat knitting machine according to claim 1, characterized in that: When it is determined that a needle striker occurs in the machine head, the controller of the machine head stops the machine and sends out a needle striker alarm signal for subsequent maintenance.

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