On-line detection device for cloth of circular knitting machine

Abstract

The utility model relates to the technical field of circular knitting machines, and discloses an online detection device for cloth of a circular knitting machine. The on-line detection device comprises a fixing support, a plastic baffle, a first metal detector, an electromagnetic coil and a controller, the circular knitting machine is provided with a cloth expanding frame, the fixing support comprises a center stand column and a supporting cross rod, the center stand column is arranged on a fixing base, the supporting cross rod is arranged on the center stand column, the plastic baffle is provided with a coil stand column, and the coil stand column is provided with a first metal detector. The coil stand column is connected with the supporting cross rod, the electromagnetic coil is wound on the coil stand column, and the first metal detector is arranged on the plastic baffle. The on-line detection device is arranged in the needle cylinder of the circular knitting machine, the first metal detector scans and detects cloth and sends a signal to the controller when sensing a metal foreign matter, and the controller controls the electromagnetic coil to be powered on to suck out the metal foreign matter on the cloth when the metal foreign matter passes through the electromagnetic coil, so that non-stop operation is realized, and the work efficiency is improved. And the cloth cannot be damaged.

Description

Technical Field

[0001] The utility model embodiment relates to the technical field of circular knitting machines, and in particular to an online detection device for circular knitting machine fabrics. Background Art

[0002] Knitted fabric is a woven fabric formed by feeding yarn from the weft direction to the working needles of a circular knitting machine, bending the yarn into loops sequentially, and interlacing them with each other in the longitudinal direction. The fabric knitted by the circular knitting machine is pulled to a cloth winding machine and wound into a roll by the cloth winding machine.

[0003] During the operation of the circular knitting machine, the metal needles, Schenker plates, needle guides and jacquard plates of the circular knitting machine cooperate with each other to perform knitting actions to weave knitted fabrics (cloth blanks). During the operation of the circular knitting machine, due to factors such as service life, wear, pulling force and impact, metal foreign bodies such as broken needle heads, needle tongues or Schenker plates will appear. Due to the adhesion of lubricating oil, these metal foreign bodies are very easy to adhere to and even weave into the complete fabric. The fabric is subsequently dyed, finished, cut and made into garments, and finally delivered to consumers. If the metal foreign bodies in the fabric are not removed, it will bring health risks to consumers.

[0004] The inventors of the present application have found that needle detectors are generally used to perform metal detection on rolled cloth, which requires large investment and high production costs for enterprises; and cloth containing metal foreign matter is easily scratched during the rolling process, causing irreparable damage to the cloth. Utility Model Content

[0005] The utility model aims to provide an online detection device for circular knitting machine fabrics, which can detect and remove metal foreign bodies in the fabrics online to solve the problems in the above-mentioned background technology.

[0006] The embodiment of the utility model provides an online detection device for circular knitting machine fabric, comprising: a fixed bracket, a plastic baffle, a first metal detector, an electromagnetic coil and a controller;

[0007] The circular knitting machine is provided with a cloth spreading frame, which is rotatably arranged on a fixed seat and is located below the needle cylinder of the circular knitting machine;

[0008] The fixed bracket includes: a central column and a supporting crossbar;

[0009] The central column is arranged on the fixed seat and is arranged to coincide with the central axis of the needle cylinder of the circular knitting machine. The supporting cross bar is arranged horizontally on the central column and is located inside the needle cylinder.

[0010] The plastic baffle is provided with a coil column, and the coil column is connected to the supporting crossbar;

[0011] The electromagnetic coil is wound on the coil column, the first metal detector is arranged on the plastic baffle, located above the coil column, and the first metal detector is arranged close to the fabric;

[0012] The first metal detector and the electromagnetic coil are electrically connected to the controller respectively. The first metal detector is used to send a detection signal to the controller when a metal foreign object is detected, and the controller is used to control the electromagnetic coil to be energized to absorb the metal foreign object.

[0013] Based on the above scheme, it can be known that the online detection device for circular knitting machine fabric of the utility model is provided with a cloth expansion frame fixed on a fixed seat by setting a fixed bracket, a plastic baffle, a first metal detector, an electromagnetic coil and a controller. The circular knitting machine is provided with a cloth expansion frame fixed on a fixed seat. The fixed bracket includes: a central column and a supporting crossbar. The central column is provided on the fixed seat, the supporting crossbar is provided on the central column, the plastic baffle is provided with a coil column connected to the supporting crossbar, the electromagnetic coil is wound on the coil column, and the first metal detector is provided on the plastic baffle, located above the coil column. The online detection device for circular knitting machine fabric of the utility model is provided inside the cylindrical needle cylinder of the circular knitting machine. The cylindrical fabric knitted by the circular knitting machine rotates with the needle cylinder and moves downward under the traction of the traction mechanism. The first metal detector continuously scans and detects the rotating cylindrical cloth. When it detects that there is metal foreign matter attached to the cloth, it sends a detection signal to the controller. When the metal foreign matter passes the position of the electromagnetic coil, the electromagnetic coil is energized to form an electromagnet, which "sucks out" the metal foreign matter on the cloth, thereby detecting and removing the metal foreign matter on the cloth without stopping the machine, with low production cost and no damage to the cloth.

[0014] In a feasible solution, the plastic baffle is in an arc shape, and an arc-shaped convex edge is provided at the bottom end of the plastic baffle, and the arc-shaped convex edge is used to form a receiving groove to accommodate metal foreign matter.

[0015] In a feasible solution, baffles are provided at both ends of the accommodating groove.

[0016] In a feasible solution, it also includes: a second metal detector;

[0017] The second metal detector is arranged on the plastic baffle, located below the coil column, and is electrically connected to the controller.

[0018] In a feasible solution, the plastic baffle is provided with a first mounting through hole and a second mounting through hole, and the first metal detector and the second metal detector are respectively inserted into the first mounting through hole and the second mounting through hole.

[0019] In a feasible solution, it also includes: a marking component;

[0020] The marking assembly comprises: a mounting bracket, a cylinder and a marking machine;

[0021] The mounting bracket is arranged on the spreading rack, the cylinder is arranged on the mounting bracket, the marking machine is connected to the movable rod of the cylinder and is located below the second metal detector, and is used for marking metal foreign bodies;

[0022] The cylinder and the marking machine are electrically connected to the controller respectively.

[0023] In a feasible solution, the mounting bracket is L-shaped and includes: a horizontal plate and a vertical plate;

[0024] The horizontal plate is arranged on the spreading frame, and the cylinder is arranged on the top end of the vertical plate.

[0025] In a feasible solution, the supporting crossbar includes: a bridging rod and a connecting rod;

[0026] The bridging rod is square and is arranged on the central column;

[0027] The bridging rod is provided with a connecting circular hole and a first threaded hole. The connecting rod can be slidably inserted into the connecting circular hole and is locked by a first hexagon socket screw.

[0028] In a feasible solution, the bridging rod is provided with a through hole and a second threaded hole;

[0029] The bridging rod is slidably arranged on the central column through the through hole and is locked by a second hexagon socket screw.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] 1. The metal foreign matter on the fabric is removed by the magnetic force of the electromagnetic coil without damaging the fabric.

[0032] 2. The arc-shaped convex edge of the plastic baffle forms a receiving groove to collect metal foreign matter for easy cleaning.

[0033] 3. The cylinder drives the marking machine to extend, and the marking machine can mark the metal foreign bodies that are not removed by the electromagnetic coil without stopping, which is convenient for subsequent operators to find and remove manually.

[0034] 4. The positions of components such as metal detectors and electromagnetic coils are adjustable on the fixed base to ensure that the metal detectors and electromagnetic coils are close to the fabric and adapt to different circular diameters of the circular knitting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 It is a schematic diagram of an online detection device for circular knitting machine fabric in an embodiment of the utility model;

[0037] Figure 2 In the embodiment of the utility model Figure 1 A partial enlarged view of the

[0038] Figure 3 It is a partial schematic diagram of the online detection device in the embodiment of the utility model;

[0039] Figure 4 It is a schematic diagram of a plastic baffle in an embodiment of the utility model;

[0040] Figure 5 It is a schematic diagram of a supporting cross bar in an embodiment of the utility model;

[0041] Figure 6 It is a schematic diagram of a marking component in an embodiment of the utility model;

[0042] Figure 7 Schematic diagram of the working process of the online detection device in the embodiment of the utility model.

[0043] Numbers in the figure:

[0044] 1. Circular knitting machine; 11. Fabric expansion rack; 12. Fixed seat; 13. Needle cylinder; 2. Fabric; 3. Fixed bracket; 31. Center column; 32. Support cross bar; 321. Bridge rod; 3211. Connecting round hole; 3212. First threaded hole; 3213. Through hole; 3214. Second threaded hole; 322. Connecting rod; 4. Plastic baffle; 401. Accommodating groove; 41. Coil column; 42. Arc convex edge; 43. Baffle; 44. First mounting through hole; 45. Second mounting through hole; 51. First metal detector; 52. Second metal detector; 6. Electromagnetic coil; 7. Marking assembly; 71. Mounting bracket; 711. Cross plate; 712. Vertical plate; 72. Cylinder; 73. Marking machine. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0049] As described in the background technology of the present application, during the operation of a circular knitting machine, metal foreign objects formed by the breakage of needle heads, needle tongues or Schenck plates may appear. These metal foreign objects are very easy to adhere to or even be woven into the complete fabric. If the metal foreign objects in the fabric are not removed, they will pose a health risk to consumers.

[0050] The inventors of the present application have found that needle detectors are generally used to perform metal detection on rolled cloth, which requires large investment and high production costs for enterprises; and cloth containing metal foreign matter is easily scratched during the rolling process, causing irreparable damage to the cloth.

[0051] In order to solve the above problems, the inventor of the present application proposed the technical solution of the present application, and the specific embodiments are as follows:

[0052] Figure 1 is a schematic diagram of an online detection device for circular knitting machine fabric in an embodiment of the utility model, Figure 2 In the embodiment of the utility model Figure 1 A partial enlarged view of Figure 3 It is a partial schematic diagram of the online detection device in the embodiment of the utility model. Figure 4 is a schematic diagram of a plastic baffle in an embodiment of the utility model, Figure 5 Schematic diagram of the supporting cross bar in the embodiment of the utility model, Figure 6 is a schematic diagram of a marking component in an embodiment of the utility model, Figure 7 Schematic diagram of the working process of the online detection device in the embodiment of the utility model.

[0053] like Figures 1 to 7 As shown, the online detection device for circular knitting machine fabric of this embodiment includes: a fixed bracket 3, a plastic baffle 4, a first metal detector 51, an electromagnetic coil 6 and a controller.

[0054] The circular knitting machine 1 is provided with a fabric expansion frame 11, which is rotatably arranged on a fixed seat 12, and is arranged between a needle cylinder 13 and a traction mechanism of the circular knitting machine 1, and rotates with the needle cylinder 13 and the fabric 2. The fabric expansion frame 11 is in a tapered shape that gradually expands from top to bottom, and abuts against the fabric 2, so that the cylindrical fabric 2 is gradually opened into a folded shape, so as to facilitate the subsequent folding of the fabric 2 into a roll.

[0055] The fixing bracket 3 includes a central column 31 and a supporting cross bar 32 .

[0056] The central column 31 is vertically fixed on the fixed seat 12, located at the center of the needle cylinder 13, and the central axis of the central column 31 coincides with the central axis of the needle cylinder 13. The support cross bar 32 is horizontally arranged, one end of the support cross bar 32 is connected to the central column 31, and the support cross bar 31 is arranged inside the cylinder of the needle cylinder 13 of the circular knitting machine 1, and is located above the fabric expansion frame 11.

[0057] A coil column 41 is provided on one side of the plastic baffle 4 , and an end of the coil column 41 is connected to the other end of the supporting crossbar 32 , so that the plastic baffle 4 is close to the inner wall of the cylindrical fabric 2 .

[0058] The electromagnetic coil 6 is wound around the coil column 41 of the plastic baffle 4, and when energized, the electromagnetic coil 6 is used to form an electromagnet on the plastic baffle 4. The first metal detector 51 is arranged on the plastic baffle 4, and the first metal detector 51 is arranged just above the coil column 41, and the induction probe of the first metal detector 51 is arranged close to the cloth 2.

[0059] The first metal detector 51 and the electromagnetic coil 6 are electrically connected to the controller respectively.

[0060] In this embodiment, the cloth (cloth blank) produced by the circular knitting machine is cylindrical, and the cloth rotates with the needle cylinder and moves downward under the traction of the traction mechanism.

[0061] The first metal detector is set on the plastic baffle and continuously scans and detects the rotating cylindrical cloth. When the first metal detector senses that there is metal foreign matter attached to the cloth, it sends a detection signal to the controller. After receiving the detection signal sent by the first metal detector, the controller controls the electromagnetic coil to be energized, and the electromagnetic coil forms an electromagnet. When the metal foreign matter attached to the cloth passes through the position of the electromagnetic coil, the electromagnetic coil (electromagnet) "sucks out and removes" the metal foreign matter from the cloth.

[0062] It is not difficult to find from the above content that the online detection device for circular knitting machine fabric of this embodiment is provided with a cloth expansion frame by setting a fixed bracket, a plastic baffle, a first metal detector, an electromagnetic coil and a controller. The circular knitting machine is provided with a cloth expansion frame. The fixed bracket includes: a central column and a supporting crossbar. The central column is provided on a fixed seat, the supporting crossbar is provided on the central column, the plastic baffle is provided with a coil column connected to the supporting crossbar, the electromagnetic coil is wound on the coil column, and the first metal detector is provided on the plastic baffle, located above the coil column. The online detection device for circular knitting machine fabric of this embodiment is provided inside the cylindrical needle cylinder of the circular knitting machine. The cylindrical fabric knitted by the circular knitting machine rotates with the needle cylinder and moves downward under the traction of the traction mechanism. The first metal detector continuously scans and detects the rotating cylindrical cloth. When it detects that there is metal foreign matter attached to the cloth, it sends a detection signal to the controller. When the metal foreign matter passes the position of the electromagnetic coil, the electromagnetic coil is energized to form an electromagnet, which "sucks out" the metal foreign matter on the cloth, thereby detecting and removing the metal foreign matter on the cloth without stopping the machine, with low production cost and no damage to the cloth.

[0063] Optional, such as Figure 2 , Figure 3 and Figure 4 As shown, in the online detection device for circular knitting machine fabric in this embodiment, the plastic baffle 4 is arc-shaped, and the arc curvature of the plastic baffle 4 is adapted to the arc curvature of the cylindrical fabric 2, so that the plastic baffle 4 can be better approached to the cylindrical fabric 2.

[0064] The bottom end of the plastic baffle 4 is provided with an arc-shaped convex edge 42 , the opening of the arc-shaped convex edge 42 is arranged upward, and the arc-shaped convex edge 42 forms a receiving groove 401 of a receiving structure on the plastic baffle 4 , and the receiving groove 401 is used to receive metal foreign matter.

[0065] In this embodiment, when the first metal detector detects a metal foreign body, the electromagnetic coil is energized to suck the metal foreign body out of the fabric, and then the controller controls the electromagnetic coil to be de-energized, and the metal foreign body adsorbed by the electromagnetic coil falls into the receiving groove of the plastic baffle for centralized cleaning later. By providing an arc-shaped convex edge, the electromagnetic coil only needs to be energized when adsorbing the metal foreign body, thereby ensuring the safe operation of the device.

[0066] Furthermore, in the online detection device for circular knitting machine fabric in this embodiment, the plastic baffle 4 is provided with baffles 43 at both ends of the receiving groove 401, and the baffles 43 close both ends of the receiving groove 401 to ensure that metal foreign objects dropped into the receiving groove 401 will not slip out.

[0067] Optionally, the online detection device for circular knitting machine fabric in this embodiment further includes: a second metal detector 52.

[0068] The second metal detector 52 is also disposed on the plastic baffle 4 . The second metal detector 52 is located directly below the coil column 41 . The second metal detector 52 is electrically connected to the controller.

[0069] In this embodiment, after the first metal detector detects the metal foreign body, the electromagnetic coil "sucks" the metal foreign body out of the cloth and removes it. Then, when the cloth passes through the second metal detector, the cloth is inspected again. If the metal foreign body is not sucked out by the electromagnetic coil due to reasons such as being tightly embedded in the cloth, the second metal detector sends detection information to the controller after detecting the metal foreign body, and the controller issues an alarm to remind the operator to check the cloth and manually remove the metal foreign body from the cloth.

[0070] Furthermore, in the online detection device for circular knitting machine fabric in this embodiment, the plastic baffle 4 is provided with a first mounting through hole 44 and a second mounting through hole 45, and the first mounting through hole 44 and the second mounting through hole 45 are respectively arranged above and below the coil column 41.

[0071] The first metal detector 51 and the second metal detector 52 are respectively inserted into the first mounting through hole 44 and the second mounting through hole 45 of the plastic baffle 4 , so as to facilitate the installation and fixation of the first metal detector 51 and the second metal detector 52 .

[0072] Furthermore, the online detection device for circular knitting machine fabric in this embodiment also includes: a marking component 7.

[0073] The marking assembly 7 includes: a mounting bracket 71 , a cylinder 72 and a marking machine 73 .

[0074] The mounting bracket 71 is disposed on the fabric spreading frame 11 and rotates along with the fabric spreading frame 11 .

[0075] The cylinder 72 is disposed on the mounting bracket 71 , and the marking machine 73 is connected to the movable rod of the cylinder 72 . The marking machine 73 is located below the second metal detector 52 and is used for marking metal foreign bodies.

[0076] The air cylinder 72 and the marking machine 73 are electrically connected to the controller respectively.

[0077] In this embodiment, when the second metal detector detects a metal foreign body on the fabric, it sends a detection signal to the controller, and the controller calculates the vertical downward movement speed of the fabric and other parameters to pre-position the metal foreign body. Then, when the metal foreign body moves down to the nozzle position of the marking machine, the controller extends the marking machine forward through the cylinder, and the marking machine is activated at the same time to mark the metal foreign body on the fabric, so that the operator can quickly find and identify the metal foreign body on the fabric and remove it manually. Then the relevant equipment is reset and waits for the next action instruction.

[0078] Furthermore, in the online detection device for circular knitting machine fabric in this embodiment, the mounting bracket 71 is in a right-angled L-shape, including: a horizontal plate 711 and a vertical plate 712 .

[0079] The horizontal plate 711 is set on the spreading frame 11 through fixing bolts, and the cylinder 72 is set on the top of the vertical plate 712 through fixing bolts.

[0080] Optional, such as Figure 1 and Figure 5 As shown, in the online detection device for circular knitting machine fabric in this embodiment, the supporting cross bar 32 includes: a bridging rod 321 and a connecting rod 322.

[0081] The bridging rod 321 is in a square shape, one end of the bridging rod 321 is disposed on the central column 31 , and the other end of the bridging rod 321 is provided with a connecting circular hole 3211 and a first threaded hole 3212 .

[0082] One end of the connecting rod 322 is slidably inserted into the connecting circular hole 3211 of the bridging rod 321, and the first hexagon socket screw is engaged in the first threaded hole 3212 of the bridging rod 321. When tightened, the first hexagon socket screw abuts against the connecting rod 322 to lock and fix the connecting rod 322 on the bridging rod 321. The other end of the connecting rod 322 is arranged on the coil column 41 of the plastic baffle 4.

[0083] In this embodiment, the supporting cross bar is a retractable adjustment rod, which facilitates the adjustment of the horizontal positions of the plastic baffle and the metal detector.

[0084] Furthermore, in the online detection device for circular knitting machine fabric in this embodiment, the bridging rod 321 is provided with a through hole 3213 and a second threaded hole 3214 .

[0085] The through hole 3213 of the bridging rod 321 can be slidably penetrated on the central column 31, and the second hexagon socket screw is engaged in the second threaded hole 3214 of the bridging rod 321. When tightened, the second hexagon socket screw abuts against the central column 31, and the bridging rod 321 is locked and fixed on the central column 31, so as to facilitate the adjustment of the upper and lower positions of the plastic baffle and the metal detector.

[0086] like Figure 7 As shown, the online detection device for circular knitting machine fabric of the utility model has the following working process:

[0087] The first metal detector continuously scans the rotating cylindrical cloth. When a metal foreign body is detected and the metal foreign body adhered to the surface of the cloth passes the position of the electromagnetic coil, the electromagnetic coil is energized to "suck out" the metal foreign body with strong magnetic force and attach it to the plastic baffle. If the metal foreign body is not sucked out and removed due to reasons such as too tight adhesion, when the cylindrical cloth continues to move vertically downward to the second metal detection sensor, it will be detected by the second metal detection sensor. The controller then calculates the vertical downward speed of the cloth and other parameters, and performs positioning pre-processing on the metal foreign body. When the metal foreign body moves down to the nozzle position of the marking machine, the controller issues a command, and the cylinder drives the marking machine to extend. At the same time, the marking machine marks the position where the metal foreign body is adhered.

[0088] Finally, all related equipment is reset and waits for the next stage of action instructions. The adsorbed metal foreign matter falls freely into the plastic baffle groove due to its own gravity, which is convenient for manual cleaning later. The cloth marked by the marking machine is quickly identified by the operator and the metal foreign matter is manually removed.

[0089] In the present invention, unless otherwise clearly specified and limited, a first feature being “on” or “under” a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact via an intermediate medium.

[0090] Moreover, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An online detection device for circular knitting machine fabric, characterized in that: include: A fixing bracket, a plastic baffle, a first metal detector, an electromagnetic coil and a controller; The circular knitting machine is provided with a cloth spreading frame, which is rotatably arranged on a fixed seat and is located below the needle cylinder of the circular knitting machine; The fixed bracket includes: a central column and a supporting crossbar; The central column is arranged on the fixed seat and is arranged to coincide with the central axis of the needle cylinder of the circular knitting machine. The supporting cross bar is arranged horizontally on the central column and is located inside the needle cylinder. The plastic baffle is provided with a coil column, and the coil column is connected to the supporting crossbar; The electromagnetic coil is wound on the coil column, the first metal detector is arranged on the plastic baffle, located above the coil column, and the first metal detector is arranged close to the fabric; The first metal detector and the electromagnetic coil are electrically connected to the controller respectively. The first metal detector is used to send a detection signal to the controller when a metal foreign object is detected, and the controller is used to control the electromagnetic coil to be energized to absorb the metal foreign object.

2. The online detection device for circular knitting machine fabric according to claim 1, characterized in that: The plastic baffle is in an arc shape, and an arc-shaped convex edge is provided at the bottom end of the plastic baffle, and the arc-shaped convex edge is used to form a receiving groove to receive metal foreign matter.

3. The online detection device for circular knitting machine fabric according to claim 2, characterized in that: Baffles are provided at both ends of the accommodating groove.

4. The online detection device for circular knitting machine fabric according to claim 1, characterized in that: Also includes: a second metal detector; The second metal detector is arranged on the plastic baffle, located below the coil column, and is electrically connected to the controller.

5. The online detection device for circular knitting machine fabric according to claim 4, characterized in that: The plastic baffle is provided with a first mounting through hole and a second mounting through hole, and the first metal detector and the second metal detector are respectively inserted into the first mounting through hole and the second mounting through hole.

6. The on-line detection device for circular knitting machine fabric according to claim 4, characterized in that: Also includes: Marking components; The marking assembly comprises: a mounting bracket, a cylinder and a marking machine; The mounting bracket is arranged on the spreading rack, the cylinder is arranged on the mounting bracket, the marking machine is connected to the movable rod of the cylinder and is located below the second metal detector, and is used for marking metal foreign bodies; The cylinder and the marking machine are electrically connected to the controller respectively.

7. The on-line detection device for circular knitting machine fabric according to claim 6, characterized in that: The mounting bracket is L-shaped and includes: a horizontal plate and a vertical plate; The horizontal plate is arranged on the spreading frame, and the cylinder is arranged on the top end of the vertical plate.

8. The on-line detection device for circular knitting machine fabric according to claim 1, characterized in that: The supporting crossbar comprises: a bridging rod and a connecting rod; The bridging rod is square and is arranged on the central column; The bridging rod is provided with a connecting circular hole and a first threaded hole. The connecting rod can be slidably inserted into the connecting circular hole and is locked by a first hexagon socket screw.

9. The on-line detection device for circular knitting machine fabric according to claim 8, characterized in that: The bridging rod is provided with a through hole and a second threaded hole; The bridging rod is slidably arranged on the central column through the through hole and is locked by a second hexagon socket screw.

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