A system for monitoring a core yarn on a spinning frame

Abstract

The application relates to a core yarn monitoring system of a spinning frame, characterized in that the yarn guide mechanism comprises a pair of yarn guide wheel assemblies, the yarn guide wheel assembly comprises a yarn guide wheel and a protective cover arranged on one side of the yarn guide wheel, a detection sensor assembly for detecting the rotation of the yarn guide wheel is arranged on the front yarn guide wheel assembly, the detection sensor assembly is in an integrated structure or a modular structure, the detection sensor assembly is arranged on one side of the protective cover of the front yarn guide wheel assembly and located on the side surface of the protective cover away from the yarn guide wheel, and a control system is further arranged and used for receiving the signal of the detection sensor assembly and prompting or controlling the action of a breaking mechanism; through the integrated structure or the modular structure, single-wheel monitoring can be realized without space limitation, the detection box body can be integrated on the front and rear yarn guide wheels, double-yarn guide wheel monitoring can be realized, and the detection accuracy is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of core yarn monitoring, and particularly relates to a spinning frame core yarn monitoring system. BACKGROUND

[0002] The function of the guide roller on the spinning frame is to stably guide and convey the core yarn and provide a certain tension; the rotation power of the guide roller is derived from the traction of the core yarn, which drives the guide roller to rotate through friction between the core yarn and the guide roller. The guide roller of the spinning frame is equipped with one guide roller or a pair of front and rear guide rollers per spindle according to the requirements of the core yarn.

[0003] At present, a new type of spinning frame begins to appear a detection technology of judging whether the core yarn is broken by monitoring the rotation of the guide roller, which is conducive to avoiding the scrap of the yarn caused by the continuous operation of the spinning frame after the core yarn is broken. The independent sensor structure for monitoring whether the guide roller rotates is installed on one side of the guide roller mounting frame. Although this independent sensor structure can monitor the rotation of the guide roller in real time and alarm when the yarn is broken, it still has certain limitations:

[0004] Firstly, when the existing spinning frame of the user has only one guide roller, due to the structure limitation of the spinning frame, the independent sensor cannot be directly installed, and only an additional guide roller can be installed on the spinning frame, and the independent sensor component is installed on the newly added guide roller, which has a large reform cost. However, in the spinning frame with a pair of guide rollers, due to the structure limitation, the independent sensor can only be installed on the rear guide roller, but the wrap angle of the rear guide roller with the core yarn is small, which is easy to slip, and the detection result has low reference degree.

[0005] Secondly, the independent sensor and the rear guide roller are not closed, and the detection accuracy is greatly affected by the working environment, and false alarm is easy to occur.

[0006] In addition, during the rotation speed monitoring process of the guide roller of the spinning frame, due to the influence of the external environment, for example, when the spinning frame reciprocating blowing and suction device moves back and forth on the spinning frame to blow and suck the wind to clean the fly in the vicinity of the roller or the guide roller, the guide roller may have abnormal rotation speed for a short time but the rotation speed is immediately restored, which is easy to cause monitoring false alarm and affects normal production. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a spinning frame core yarn monitoring system, which can reduce the reform cost of the spinning frame core yarn monitoring and has high detection accuracy.

[0008] To solve the above technical problems, the technical scheme of the present application is as follows: a spinning frame core yarn monitoring system, comprising

[0009] A guide mechanism for feeding and drafting the core yarn of the spinning frame;

[0010] Roller mechanism for the feed and draft of roving on a spinning frame;

[0011] Breaking mechanism for breaking the feed of roving on the roller mechanism;

[0012] The innovation lies in that the yarn guide mechanism comprises a pair of yarn guide wheel assemblies, each of which comprises a yarn guide wheel and a protective cover arranged on one side of the yarn guide wheel, the yarn guide wheel assembly with a larger core yarn wrap angle is defined as a front yarn guide wheel assembly, and the yarn guide wheel assembly with a smaller core yarn wrap angle is defined as a rear yarn guide wheel assembly; the front yarn guide wheel assembly is provided with a detection sensor assembly for detecting the rotation of the yarn guide wheel, the detection sensor assembly is in an integrated structure or a modular structure, and is arranged on one side of the protective cover of the front yarn guide wheel assembly and on the side of the protective cover away from the yarn guide wheel;

[0013] The control system is further arranged to receive the signal of the detection sensor assembly and to prompt or control the action of the breaking mechanism.

[0014] Further, the rear yarn guide wheel assembly is also provided with a detection sensor assembly.

[0015] Further, each of the front and rear yarn guide wheel assemblies comprises a yarn guide wheel, a yarn guide shaft, a support and a protective cover, the yarn guide wheel is rotatably installed at one end of the yarn guide shaft through a bearing, the other end of the yarn guide shaft is installed on the support, the protective cover comprises a circular body sleeved on the yarn guide shaft and an annular shielding member located on the outer circumferential edge of the circular body, the circular body of the protective cover is installed on the yarn guide shaft between the yarn guide wheel and the support, and a gap exists between the corresponding side end face of the yarn guide wheel and the circular body of the protective cover, the annular shielding member of the protective cover covers a part of the outer contour of the yarn guide wheel, the end face of the circular body of the protective cover close to the yarn guide wheel is defined as a first end face, the end face of the circular body of the protective cover away from the yarn guide wheel is defined as a second end face, and the detection sensor assembly is located on the side of the second end face of the circular body.

[0016] Further, the detection sensor assembly adopts an integrated structure, and specifically comprises a detection box body, the detection box body is integrally formed on the second end face of the circular body of the protective cover, and the detection box body is internally provided with a circuit board and electronic components for detecting the rotation of the yarn guide wheel.

[0017] Further, the detection sensor assembly adopts a modular structure, and specifically comprises a detection box body and a yarn guide shaft sleeve, the yarn guide shaft sleeve is sleeved on the yarn guide shaft between the protective cover and the support, and the detection box body is integrally formed on the yarn guide shaft sleeve, and the detection box body is internally provided with a circuit board and electronic components for detecting the rotation of the yarn guide wheel.

[0018] Further, the support has a column with an axis horizontally arranged, a threaded hole extending along the axis is formed in the center of the column, the second end of the guide wire shaft is provided with an external thread structure, and the second end of the guide wire shaft is threadedly connected with the threaded hole of the column through the external thread structure.

[0019] Further, a center hole is formed in the center of the circular body, and the guide wire shaft is provided with an anti-circumferential rotation limiting structure at the portion sleeved with the circular body;

[0020] The guide wire shaft and the circular body of the protective cover are further provided with an adjusting sleeve for rotating the guide wire shaft, a through positioning hole is formed in the center of the adjusting sleeve and can be embedded with the anti-circumferential rotation limiting structure, the anti-circumferential rotation limiting structure of the guide wire shaft is embedded in the positioning hole, and the relative fixing of the adjusting sleeve and the guide wire shaft in the circumferential direction is realized.

[0021] The adjusting sleeve is sequentially divided into an embedded segment and an adjusting segment in the axial direction, the outer contour of the embedded segment is a shape that can be embedded in the center hole of the circular body, and the outer contour of the adjusting segment is a regular polygon for easy rotation.

[0022] In the axial direction of the guide wire shaft, the embedded segment is embedded between the anti-circumferential rotation limiting structure of the guide wire shaft and the center hole of the circular body, and the adjusting segment is located outside the second end surface of the circular body of the protective cover.

[0023] The end of the guide wire sleeve is sleeved on the column and can move along the axial direction of the column under the guidance of the column; the guide wire sleeve includes a sleeve body and an end cover integrally formed at the front end of the sleeve body, and an end cover hole through which the guide wire shaft passes is formed in the center of the end cover.

[0024] A compression spring is arranged in the annular cavity formed between the guide wire shaft and the sleeve body, one end of the compression spring abuts against the inner end surface of the end cover, and the other end abuts against the end surface of the column; the end cover of the guide wire sleeve can abut against the end surface of the adjusting segment of the adjusting sleeve under the elastic deformation force of the compression spring.

[0025] Further, a positioning protrusion is arranged on the outer end surface of the end cover of the guide wire sleeve, and the adjusting segment of the adjusting sleeve is provided with a positioning pit that can be embedded with the positioning protrusion; the relative displacement of the guide wire sleeve and the column in the circumferential direction is limited.

[0026] Further, the monitoring method of the monitoring system is as follows:

[0027] S1: The sensing assembly detects the guide wire wheel rotation speed signals of the front guide wire wheel assembly and the rear guide wire wheel assembly in each guide wire wheel group respectively, and transmits the signals to the monitoring system;

[0028] S2: The instantaneous average speeds of the front guide wire wheel and the rear guide wire wheel in each guide wire wheel group at time T1 are calculated;

[0029] Firstly, the monitoring system collects the instantaneous speeds of all the front guide rollers at a certain time T1,

[0030] The set of instantaneous speeds of the front guide rollers is denoted as A = {A1, A2, A3, …, An}, n

[0031] The set of instantaneous speeds of the back guide rollers is denoted as B = {B1, B2, B3, …, Bn}, n

[0032] Then, the instantaneous average speed A0 of all the front guide rollers and the instantaneous average speed B0 of all the back guide rollers are calculated,

[0033] A0= (A1+A2+A3+…+An) / n; n

[0034] B0= (B1+B2+B3+…+Bn) / n; n

[0035] n is the total number of the guide roller sets of the spinning frame;

[0036] S3: Determine whether each guide roller set is abnormal at time T1 and update the early warning library;

[0037] The monitoring system compares the instantaneous speed of each front guide roller at this time with the instantaneous average speed A0 of the front guide rollers to determine whether the error is within the allowable value Da; if it exceeds the allowable value Da, it is determined that the corresponding front guide roller speed is abnormal, and the front guide roller is marked as a suspected faulty front guide roller at time T1.

[0038] The monitoring system compares the instantaneous speed of each back guide roller at this time with the instantaneous average speed B0 of the back guide rollers to determine whether the error is within the allowable value Db; if it exceeds the allowable value Db, it is determined that the corresponding back guide roller speed is abnormal, and the back guide roller is marked as a suspected faulty back guide roller at time T1.

[0039] The suspected faulty front guide roller and / or back guide roller at time T1 and the guide roller set where it is located are updated to the early warning library of the monitoring system;

[0040] S4: Determine whether the front and back guide rollers of each guide roller set in the early warning library return to normal speed at time T2, T2 = T1 + 3; if the front and back guide rollers do not return to normal speed, continue to determine whether the front and back guide rollers of each guide roller set in the early warning library are at 0 at time T 2时 The front and back guide rollers in the same guide roller set are both at 0;

[0041] ​​​​If the rotation speeds of the front and rear guide wheels in the same guide wheel set are both 0, the corresponding fault indicator lights of the front and rear guide wheels of the guide wheel set are all constantly bright, the corresponding fault code is prompted, and the action of the breaking mechanism is controlled to stop the yarn feeding through the monitoring system;

[0042] If the rotation speeds of the front and rear guide wheels in the same guide wheel set are not both 0, the corresponding fault indicator lights of the front and rear guide wheels of the guide wheel set flicker, and the corresponding fault code is prompted.

[0043] The present application has the advantages that:

[0044] In the present application, the detection box body is mounted on the inner side of the front guide wheel with a large core yarn wrapping angle, the front guide wheel has a large wrapping angle and a large front wheel tension, is more easily rotated, and the monitoring of the guide wheel is more accurate; the detection sensor assembly is in an integrated or modular structure and is located on the side of the protective cover away from the guide wheel, the electronic components of the detection sensor assembly can directly detect the inner end surface of the guide wheel through the protective cover, and the inner end surface of the guide wheel is semi-enclosed in the protective cover, so that the dust and flying fluff affecting the detection are less, the interference is small, and the detection is accurate. At the same time, in the upgrading of the guide wheel, most of the existing components of the guide wheel assembly of the spinning frame can be directly used, the protective cover structure with the detection box body or the shaft sleeve of the existing guide wheel is directly replaced, the electronic components for detection are installed, the replacement and upgrading are very convenient, and the cost is low.

[0045] In addition, through the integrated or modular structure of the present application, the detection box body can be integrated on the front and rear guide wheels without space limitation, the double-guide-wheel monitoring is realized, and the detection accuracy is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0046] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0047] Figure 1 It is a control principle diagram of a spinning frame core yarn monitoring system of the present application.

[0048] Figure 2 It is a structure diagram of embodiment 1 of a spinning frame core yarn monitoring system of the present application.

[0049] Figure 3 It is a sectional view of a guide wheel assembly of embodiment 1 of the present application.

[0050] Figure 4 It is a structure diagram of embodiment 2 of a spinning frame core yarn monitoring system of the present application.

[0051] Figure 5 It is a sectional view of a guide wheel assembly of embodiment 2 of the present application.

[0052] Figure 6This is a diagram showing the adjustment state of the guide wheel assembly in Embodiment 2 of the present invention.

[0053] Figure 7 This is a structural diagram of Embodiment 3 of the core-spun yarn monitoring system for a spinning frame according to the present invention. Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0056] Example 1: Figure 2 , Figure 3 A core-spun yarn monitoring system for a ring spinning frame is shown, including a yarn guide mechanism for feeding and drafting the core yarn of the ring spinning frame; a roller mechanism for feeding and drafting the roving of the ring spinning frame; and a breaking mechanism for breaking the feeding of the roving on the roller mechanism.

[0057] The wire guiding mechanism includes a pair of wire guiding wheel assemblies. Each wire guiding wheel assembly includes a wire guiding wheel 1 and a protective cover 4 disposed on one side of the wire guiding wheel 1. The wire guiding wheel assembly with the larger core wire wrap angle is designated as the front wire guiding wheel assembly, and the one with the smaller core wire wrap angle is designated as the rear wire guiding wheel assembly. The front wire guiding wheel assembly has a detection sensor 5 for detecting the rotation of the wire guiding wheel. The detection sensor 5 is an integrated or modular structure and is disposed on one side of the protective cover 4 of the front wire guiding wheel assembly, located on the side of the protective cover 4 away from the wire guiding wheel 1. The mechanism also includes a control system for receiving signals from the detection sensor assembly and providing prompts or controlling the interruption mechanism to operate. In this embodiment, there is one core wire, which passes through the rear wire guiding wheel assembly first and then the front wire guiding wheel assembly in the wire guiding direction.

[0058] The front or rear godet assembly each comprises a godet 1, a godet shaft 2, a bracket 3 and a protective cover 4, the godet 1 is rotatably installed at one end of the godet shaft 2 through a bearing, the other end of the godet shaft 2 is installed on the bracket, the protective cover 4 comprises a circular body 41 sleeved on the godet shaft 2 and an annular cover member 42 located at the outer circumferential edge of the circular body 41; the circular body 41 of the protective cover is installed on the godet shaft 2 between the godet 1 and the bracket 3, and there is a gap between the corresponding side end face of the godet 1 and the circular body 41 of the protective cover 4, the annular cover member 42 of the protective cover 4 covers a part of the outer contour of the godet 1; the end face of the circular body 41 of the protective cover 4 close to the godet 1 is defined as a first end face, and the end face away from the godet 1 is defined as a second end face, and the detection sensor assembly 5 is located at the side of the second end face of the circular body.

[0059] In the embodiment, the detection sensor assembly 5 adopts an integrated structure, and the specific structure is as follows: a detection box body is integrally formed on the second end face of the circular body 41 of the protective cover 4, and an electric circuit board 6 and electronic components for detecting the rotation of the godet are built in the detection box body; a positioning mark for photoelectric detection is arranged on the side end face of the godet 1 close to the protective cover, and the electronic components built in the detection box body are photoelectric speed sensors; or a magnetic induction body is arranged on the godet 1, and the electronic components built in the detection box body are magneto-electric speed sensors.

[0060] The godet shaft 2 is provided with a first anti-circumferential rotation limiting structure 21 at the part sleeved with the circular body, and the center of the circular body of the protective cover 4 is provided with a positioning hole embedded with the first anti-circumferential rotation limiting structure 21; the shaft body of the godet shaft 2 between the end close to the bracket and the first anti-circumferential rotation limiting structure 21 is provided with a threaded structure, and a protective cover limiting nut is threadedly connected on the threaded structure; the detection box body has a fan-shaped structure, the inner side face of the detection box body is open, and a cover is arranged at the opening; a wiring port and an alarm prompt lamp window are also opened on the detection box body.

[0061] When the godet monitoring of the existing spinning frame is upgraded, only the godet protective cover of the spinning frame needs to be replaced with the protective cover with the detection box body in the embodiment 1, and the electric circuit board and electronic components are pre-installed in the detection box body, so that the replacement is fast. Embodiment 2

[0062] The embodiment is basically the same as the embodiment 1, and both comprise a godet mechanism, a roller mechanism, a breaking mechanism and a control system, and the detection sensor assembly is also arranged on the godet mechanism.

[0063] The different parts are as follows: Figures 4 to 6As shown: the detection sensing assembly 5 adopts a modular structure, and the specific structure is: including a detection box body and a guide wire shaft sleeve 7; the guide wire shaft sleeve 7 is sleeved on the guide wire shaft between the protective cover and the support 3, the detection box body is integrally formed on the guide wire shaft sleeve 7, and the detection box body is internally provided with a circuit board 6 and electronic components for detecting the rotation of the guide wire wheel.

[0064] The support 3 has a column 9 arranged horizontally along an axis, a threaded hole extending along the axis is formed in the center of the column 9, and the second end of the guide wire shaft 2 is provided with an external thread structure, and the second end of the guide wire shaft 2 is threadedly connected with the threaded hole of the column 9 through the external thread structure.

[0065] A central hole is formed in the center of the circular body 41, and the second anti-circumferential rotation limiting structure is arranged on the portion of the guide wire shaft 2 sleeved with the circular body 41.

[0066] A adjusting sleeve 8 for rotating the guide wire shaft is further arranged between the guide wire shaft 2 and the circular body 41 of the protective cover 4, a positioning hole penetrating through the center of the adjusting sleeve 8 and being capable of being embedded with the second anti-circumferential rotation limiting structure is formed in the center of the adjusting sleeve 8, and the second anti-circumferential rotation limiting structure of the guide wire shaft is embedded in the positioning hole, so that the relative fixing of the adjusting sleeve 8 and the guide wire shaft 2 in the circumferential direction is realized.

[0067] The adjusting sleeve 8 is sequentially divided into an embedded segment and an adjusting segment along the axial direction, the outer contour of the embedded segment is a shape that can be embedded in the central hole of the circular body 41, and the outer contour of the adjusting segment is a regular polygon convenient for rotation.

[0068] In the axial direction of the guide wire shaft 2, the embedded segment is embedded between the second anti-circumferential rotation limiting structure of the guide wire shaft and the central hole of the circular body 41, and the adjusting segment is located outside the second end surface of the circular body 41 of the protective cover.

[0069] The end of the guide wire shaft sleeve 7 is sleeved on the column 9 and can move along the axial direction of the column 9 under the guidance of the column 9; the guide wire shaft sleeve 7 includes a shaft sleeve body and an end cover 71 integrally formed on the front end of the shaft sleeve body, and an end cover hole through which the guide wire shaft 2 passes is formed in the center of the end cover 71.

[0070] A compression spring 72 is arranged in the annular cavity formed between the guide wire shaft 2 and the shaft sleeve body, one end of the compression spring 72 abuts against the inner end surface of the end cover 71, and the other end abuts against the end surface of the column; the end cover of the guide wire shaft sleeve 7 can abut against the end surface of the adjusting segment of the adjusting sleeve 8 under the elastic deformation force of the compression spring 72.

[0071] A positioning protrusion 73 is arranged on the outer end surface of the end cover 71 of the guide wire shaft sleeve 7, and the outer end surface of the adjusting segment of the adjusting sleeve 8 is provided with a positioning pit capable of being embedded with the positioning protrusion 73; the relative displacement of the guide wire shaft sleeve 7 and the column 9 in the circumferential direction is limited.

[0072] When the detection sensing assembly of the embodiment 2 is used for the guide roller monitoring, if the existing spinning frame is upgraded, the original guide roller shaft sleeve can be directly replaced.

[0073] The following table is the data comparison of the embodiment 1, the embodiment 2 and the traditional monitoring method:

[0074]

[0075] From the comparison of the embodiment 1 and the embodiment 2, it can be seen that the installation of the detection sensing assembly on the guide roller assembly has high detection accuracy, and the difference between the two is not large, and the cost is not large. In the single wheel detection, the detection sensing assembly can be selectively used according to the structure of the on-site guide roller assembly. Compared with the non-integrated or non-modular structure detection sensing assembly, the cost of the embodiment 1 and the embodiment 2 is greatly reduced, and the detection accuracy is greatly improved. Embodiment 3

[0076] The spinning frame core yarn monitoring system of the embodiment includes a guide mechanism, a roller mechanism, a breaking mechanism and a control system.

[0077] The guide mechanism includes a pair of guide roller assemblies, and each guide roller assembly includes a guide roller 1 and a protective cover 4 arranged on one side of the guide roller. The guide roller assembly with a larger core yarn wrapping angle is defined as the front guide roller assembly, and the guide roller assembly with a smaller core yarn wrapping angle is defined as the rear guide roller assembly. In the embodiment, there is one core yarn, which passes through the rear guide roller assembly first and then passes through the front guide roller assembly in the core yarn introduction direction.

[0078] As shown in Figure 7 In the embodiment, a double guide roller detection scheme is used, and the detection sensing assembly for detecting the rotation of the guide roller is arranged on the front guide roller assembly and the rear guide roller assembly, and the detection sensing assembly is in an integrated structure or a modular structure. When the detection sensing assembly is in an integrated structure, its specific structure is the same as that of the embodiment 1, and when the detection sensing assembly is in a modular structure, its specific structure is the same as that of the embodiment 2, which will not be repeated here. It can be selected according to the specific spinning frame model whether to use a modular structure or an integrated structure, or to use a mixed structure.

[0079] In the embodiment, a monitoring method for the double guide roller detection scheme is also provided.

[0080] S1: The detection sensing assembly detects the guide roller rotation speed signals of the front guide roller assembly and the rear guide roller assembly in each guide roller group, respectively, and transmits the signals to the monitoring system;

[0081] S2: Calculate the instantaneous average speed of the front guide roller and the rear guide roller in each guide roller group at time T1.

[0082] Firstly, the monitoring system collects the instantaneous speeds of all the front guide rollers of the spinning frame at a certain time T1,

[0083] The set of instantaneous speeds of the front guide rollers is denoted as A = {A1, A2, A3, …, An}, n

[0084] The set of instantaneous speeds of the back guide rollers is denoted as B = {B1, B2, B3, …, Bn}, n

[0085] Then, the instantaneous average speed A0 of all the front guide rollers and the instantaneous average speed B0 of all the back guide rollers are calculated,

[0086] A0= (A1+ A2+ A3+ …+ An) / n; n

[0087] B0= (B1+ B2+ B3+ …+ Bn) / n; n

[0088] n is the total number of the guide roller groups of the spinning frame; if the number of spindles of the spinning frame is 1000 spindles, for example, the number of the guide roller groups is 1000, i.e. n is 1000, wherein the number of the front guide rollers is 1000 and the number of the back guide rollers is also 1000;

[0089] S3: determining whether each guide roller group is abnormal at the time T1 and updating the early warning library;

[0090] The monitoring system compares the instantaneous speed of each front guide roller at this time with the instantaneous average speed A0 of the front guide rollers to determine whether the error is within the allowable value Da; if the error exceeds the allowable value Da, it is determined that the corresponding front guide roller speed is abnormal, and the front guide roller is marked as a suspected faulty front guide roller at the time T1.

[0091] The monitoring system compares the instantaneous speed of each back guide roller at this time with the instantaneous average speed B0 of the back guide rollers to determine whether the error is within the allowable value Db; if the error exceeds the allowable value Db, it is determined that the corresponding back guide roller speed is abnormal, and the back guide roller is marked as a suspected faulty back guide roller at the time T1.

[0092] The suspected faulty front guide roller and / or back guide roller at the time T1 and the guide roller group where the guide roller is located are updated to the early warning library of the monitoring system.

[0093] S4: determining whether the front and back guide rollers of each guide roller group in the early warning library return to normal speed at the time T2, T2 = T1 + 3; if the front and back guide rollers do not return to normal speed, continue to determine whether the front and back guide rollers of each guide roller group in the early warning library return to normal speed at the time T 2时 The front and back guide rollers in the same guide roller group have the same speed; ​​​​

[0094] If the rotation speeds of the front and rear guide wheels in the same guide wheel set are both 0, the corresponding fault indicator lights of the front and rear guide wheels of the guide wheel set are all constantly bright, the corresponding fault code is prompted, and the action of the breaking mechanism is controlled through the monitoring system to stop the yarn feeding;

[0095] If the rotation speeds of the front and rear guide wheels in the same guide wheel set are not both 0, the corresponding fault indicator lights of the front and rear guide wheels of the guide wheel set flicker, and the corresponding fault code is prompted.

[0096] The following table is a comparison of the accuracy of example 3 using single guide wheel monitoring and double guide wheel monitoring:

[0097]

[0098] From the above table, it can be seen that the average monitoring accuracy is very high when the detection sensor assembly is installed on the front and rear guide wheels at the same time and monitored by the monitoring method in example 3, which can improve more than 2.8% compared with single wheel monitoring, but it does not reach the theoretical 99.9%, which may be due to statistical errors. At the same time, double guide wheel detection compared with single guide wheel detection has improved in cost, but the cost is still lower compared with the traditional scheme.

[0099] Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be applied to the present application, for example: when the core yarn of the core spinning machine is two, the core yarn can be wound around the rear guide wheel and the front guide wheel at the same time as in the examples, or one core yarn can be wound around each of the front and rear guide wheels. In this way, the core yarns on the front and rear guide wheels can also be monitored respectively.

Claims

1. A system for monitoring the core yarn of a spinning frame, comprising a guide mechanism for the feeding and drafting of the respective spindle yarns of the spinning frame; a roller mechanism for the feeding and drafting of the roving of the spinning frame; a breaking mechanism for breaking the feeding of the roving on the roller mechanism; characterized in that the guide mechanism comprises a pair of guide roller assemblies, each of which comprises a guide roller and a protective cover arranged on one side of the guide roller, the guide roller assembly with a larger yarn angle being defined as the front guide roller assembly, and the guide roller assembly with a smaller yarn angle being defined as the rear guide roller assembly; a detection sensor assembly for detecting the rotation of the guide roller is arranged on the front guide roller assembly, and the detection sensor assembly is in an integrated structure or a modular structure, and is arranged on one side of the protective cover of the front guide roller assembly, and on the side of the protective cover away from the guide roller; a control system is further arranged for receiving the signal of the detection sensor assembly and prompting or controlling the action of the breaking mechanism; the rear guide roller assembly also has a detection sensor assembly; the monitoring method of the monitoring system is as follows: S1: the detection sensor assembly detects the rotation speed signal of the front guide roller assembly and the rear guide roller assembly in each guide roller assembly, and transmits the signal to the monitoring system; S2: the instantaneous average speed of the front guide roller and the rear guide roller in each guide roller assembly at time T1 is calculated; firstly, the monitoring system collects the instantaneous rotation speed of all unit guide roller assemblies of the spinning frame at a certain time T1, The set of instantaneous velocities of each lead wheel is denoted as A = {A1, A2, A3, ..., A...} n }, The set of instantaneous velocities of each guide wheel is denoted as B = {B1, B2, B3, ..., B}. n }, then, the instantaneous average speed A0 of all front guide rollers and the instantaneous average speed B0 of all rear guide rollers are calculated, A0= (A1+ A2+ A3+... + An) / n; n ) / n; B0= (B1+ B2+ B3+... + B n ) / n; n is the total number of guide roller assemblies of the spinning frame; S3: whether each guide roller assembly is abnormal at time T1 is determined and the early warning library is updated; the monitoring system compares the instantaneous speed of each front guide roller at this time with the instantaneous average speed A0 of the front guide roller, and determines whether the error is within the allowable value Δa; if the allowable value Δa is exceeded, it is determined that the corresponding front guide roller speed is abnormal, and the front guide roller is marked as a suspected faulty front guide roller at time T1; the monitoring system compares the instantaneous speed of each rear guide roller at this time with the instantaneous average speed B0 of the rear guide roller, and determines whether the error is within the allowable value Δb; if the allowable value Δb is exceeded, it is determined that the corresponding rear guide roller speed is abnormal, and the rear guide roller is marked as a suspected faulty rear guide roller at time T1; the suspected faulty front guide roller and / or rear guide roller at time T1 and the guide roller assembly in which they are located are updated to the early warning library of the monitoring system; S4: whether the front and rear guide rollers of each guide roller assembly in the early warning library return to normal speed at time T2 is determined, T2=T1+3; if the front and rear guide rollers do not return to normal speed, whether the front and rear guide rollers in the same guide roller assembly at time T2 are both 0 is determined; if the front and rear guide rollers in the same guide roller assembly are both 0, the corresponding fault indicator lights of the front and rear guide rollers of the guide roller assembly are all constantly on, and the corresponding fault code is prompted, and the breaking mechanism is controlled to stop the yarn feeding through the monitoring system; if the front and rear guide rollers in the same guide roller assembly are not both 0, the corresponding fault indicator lights of the front and rear guide rollers of the guide roller assembly flicker, and the corresponding fault code is prompted.

2. The system according to claim 1, characterized in that: The front or rear godet assembly comprises a godet, a godet shaft, a bracket and a protective cover, the godet is rotatably installed at one end of the godet shaft through a bearing, the other end of the godet shaft is installed on the bracket, the protective cover comprises a circular body sleeved on the godet shaft and an annular cover member located at the outer circumferential edge of the circular body, the circular body of the protective cover is installed on the godet shaft between the godet and the bracket, and a gap exists between the circular body and the corresponding side end face of the godet, the annular cover member of the protective cover covers a part of the outer contour of the godet, the end face of the circular body of the protective cover close to the godet is defined as a first end face, the end face of the circular body away from the godet is defined as a second end face, and the detection sensor assembly is located at the second end face side of the circular body.

3. The system according to claim 2, characterized in that: The detection sensor assembly adopts an integrated structure, and specifically comprises a detection box body, the detection box body is integrally formed on the second end face of the circular body of the protective cover, and the detection box body is internally provided with a circuit board and electronic components for detecting the rotation of the godet.

4. The spun yarn core yarn monitoring system according to claim 2, characterized in that: The detection sensor assembly adopts a modular structure, and specifically comprises a detection box body and a godet shaft sleeve, the godet shaft sleeve is sleeved on the godet shaft between the protective cover and the bracket, and the detection box body is integrally formed on the godet shaft sleeve, and the detection box body is internally provided with a circuit board and electronic components for detecting the rotation of the godet.

5. The system for monitoring a core yarn of a spinning frame according to claim 4, characterized in that: The bracket has a column body arranged horizontally along an axis, a threaded hole extending along an axial direction is formed in the center of the column body, the second end of the godet shaft is provided with an external thread structure, and the second end of the godet shaft is threadedly connected to the threaded hole of the column body through the external thread structure.

6. The spun yarn core yarn monitoring system according to claim 5, characterized in that: A central hole is formed in the center of the circular body, and the godet shaft is provided with an anti-circumferential-rotation limiting structure at the portion sleeved with the circular body. An adjusting sleeve for rotating the godet shaft is further arranged between the godet shaft and the circular body of the protective cover, a through positioning hole is formed in the center of the adjusting sleeve and can be embedded in the anti-circumferential-rotation limiting structure, the anti-circumferential-rotation limiting structure of the godet shaft is embedded in the positioning hole, so that the adjusting sleeve and the godet shaft are relatively fixed in the circumferential direction. The adjusting sleeve is sequentially divided into an embedded segment and an adjusting segment in the axial direction, the outer contour of the embedded segment is shaped to be embedded in the central hole of the circular body, and the outer contour of the adjusting segment is a regular polygon for easy rotation. In the axial direction of the godet shaft, the embedded segment is embedded between the anti-circumferential-rotation limiting structure of the godet shaft and the central hole of the circular body, and the adjusting segment is located outside the second end face of the circular body of the protective cover. The end of the godet sleeve is sleeved on the column body and can move along the axial direction of the column body under the guidance of the column body, the godet sleeve comprises a sleeve body and an end cover integrally formed at the front end of the sleeve body, and an end cover hole through which the godet shaft passes is formed in the center of the end cover. A compression spring is arranged in the annular cavity formed between the godet shaft and the sleeve body, one end of the compression spring abuts against the inner end face of the end cover, and the other end of the compression spring abuts against the end face of the column body, and the end cover of the godet sleeve can abut against the end face of the adjusting segment of the adjusting sleeve under the elastic deformation force of the compression spring.

7. The system according to claim 6, characterized in that: The end cover outer end face of the guide wire sleeve is provided with a positioning protrusion, and the adjusting section outer end face of the adjusting sleeve is provided with a positioning pit capable of being embedded with the positioning protrusion; the relative displacement of the guide wire sleeve and the column in the circumferential direction is limited.

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