Electromagnetic needle of a thread accumulator

Abstract

The application provides an electromagnetic needle of a thread accumulator, which comprises a shell and a needle body, a soft iron is fixedly sleeved on the middle part of the needle body, a sliding cavity for accommodating the soft iron and allowing the soft iron to slide up and down is formed in the shell, an upper cover plate is arranged at the upper end of the sliding cavity, a lower cover plate is arranged at the lower end of the sliding cavity, a through hole for the needle body to pass through is formed in each of the upper cover plate and the lower cover plate, and a magnetizing unit for magnetizing the soft iron is fixedly arranged on the middle part of the shell in the up-down direction. In use, the soft iron is magnetized by the magnetizing unit, so that the soft iron itself has a magnetic pole. Thus, the soft iron can be moved by only a small current in the electromagnetic coil. In addition, the electromagnetic coil is arranged above and below the soft iron. Thus, suction force is formed on one electromagnetic coil, and repulsion force is formed on the other electromagnetic coil. The performance of the electromagnetic needle can be greatly improved, and the current size in the single electromagnetic coil can be reduced to reduce the heat generation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of textile equipment, and in particular to an electromagnetic needle of a weft accumulator. BACKGROUND

[0002] The weft accumulator is an important accessory of the shuttleless loom. Its principle of use is to store a certain number of yarns on the yarn storage drum in advance, and then drive the yarn storage drum to vibrate by the motor, and then supply the yarns on it to the loom. The purpose is to ensure the uniformity and constancy of the yarn tension and the constancy of the weft length. The weft accumulator refers to the temporary storage device of the weft yarn unwound from the bobbin before it is introduced into the shed. It is used for water jet and air jet looms and is usually composed of a motor, a yarn storage drum, a yarn winding disc, a yarn storage amount detector, a damping ring, a tensioner, a yarn discharging mechanism, etc. It also includes an electromagnetic needle. The electromagnetic needle is a needle body structure that needs to be reciprocated frequently.

[0003] The electromagnetic needle in the prior art includes a needle body, a soft iron for magnetic attraction is arranged in the middle of the needle body, and then the soft iron is reciprocated by the electromagnetic coils at both ends. For example, Chinese patent CN213538272U discloses an electromagnetic needle with an auxiliary disassembly structure for a weft accumulator. Since the electromagnetic needle needs to stop for a certain period of time when it reaches the upper and lower positions, the soft iron needs to be continuously powered and attracted by the electromagnetic coil after being attracted by the soft iron and positioned. This power-on process will generate a lot of heat. If the soft iron is set as a permanent magnet, the permanent magnet can be self-attracted to the two end positions without the need for continuous power supply of the electromagnetic coil. At the same time, since the permanent magnet itself has magnetism, it can also reduce the power-on current of the electromagnetic coil while ensuring the reciprocating speed of the permanent magnet. However, the electromagnetic needle is a high-frequency moving part with extremely fast movement speed and strong impact at both ends. The permanent magnet is brittle due to its material and cannot withstand such high-frequency reciprocating motion and impact. In the test of using a permanent magnet instead of a soft iron, the permanent magnet will break after a certain number of reciprocating motions, which is the reason why the permanent magnet cannot replace the soft iron in the prior art. SUMMARY

[0004] The purpose of the present application is to provide an electromagnetic needle of a weft accumulator, which can reduce the power-on current of the electromagnetic coil and reduce heat generation while maintaining the original service life of the electromagnetic needle.

[0005] To solve the above technical problems, the technical solution provided by the present application is:

[0006] An electromagnetic needle of a thread accumulator comprises a shell and a needle body, a soft iron is fixedly sleeved on the middle part of the needle body, a sliding cavity for accommodating the soft iron and allowing the soft iron to slide up and down is formed in the shell, an upper cover plate is arranged at the upper end of the sliding cavity, a lower cover plate is arranged at the lower end of the sliding cavity, a through hole for the needle body to pass through is formed in each of the upper cover plate and the lower cover plate, a magnetizing unit for magnetizing the soft iron is fixedly arranged on the middle part of the shell in the up-down direction, the magnetizing unit is sleeved on the circumference of the soft iron, the same magnetic pole is arranged at the end of the magnetizing unit close to the soft iron, and an electromagnetic coil for attracting or repelling the soft iron is fixedly arranged above and below the magnetizing unit.

[0007] In the above scheme, the soft iron is also called pure iron for electricians, and the soft iron will lose magnetism after being magnetized and leaving the magnetic field. In use, the soft iron is magnetized by the magnetizing unit, so that the soft iron itself has a magnetic pole. As long as a small current is passed through the electromagnetic coil, the soft iron can be moved. In addition, the electromagnetic coils are arranged above and below the soft iron. In this way, an attractive force can be formed on one electromagnetic coil, and a repulsive force can be formed on the other electromagnetic coil. The two electromagnetic coils act at the same time, and the magnetism of the soft iron after magnetization can greatly improve the performance of the electromagnetic needle and reduce the current in the single electromagnetic coil to reduce heating. In addition, the soft iron itself is not directly used as a driving element in the present application, and the material performance of the soft iron itself does not change after being magnetized. The soft iron can still withstand high-frequency reciprocating motion.

[0008] Preferably, the spiral winding directions of the two electromagnetic coils are opposite, the two electromagnetic coils are electrically connected with the same current lead wire, and the upper cover plate and the lower cover plate are made of a ferromagnetic material.

[0009] Preferably, the magnetizing unit comprises an even number of same columnar permanent magnets, the columnar permanent magnets are uniformly and spacedly arranged in the circumferential direction of the soft iron, the columnar permanent magnets are arranged with their shafts towards the soft iron, and the same magnetic pole is arranged at the end of all the columnar permanent magnets close to the soft iron.

[0010] Preferably, the shell is a cylindrical structure arranged in a vertical manner, a plurality of radial circular holes for accommodating the columnar permanent magnets are formed in the outer peripheral wall of the shell, and the sliding cavity in the cylindrical shape is concentric with the shell in the cylindrical shape.

[0011] Preferably, the shell comprises an upper half body and a lower half body, a plurality of semicircular grooves for enclosing the radial circular holes are formed in the upper end face of the lower half body and the upper end face of the upper half body.

[0012] As preferred, a plurality of convex points are arranged on the upper end surface of the lower half body in a circumferential direction at uniform intervals, a plurality of concave points are arranged on the upper end surface of the lower half body in a circumferential direction at uniform intervals, a concave point is arranged on the lower end surface of the upper half body at a position corresponding to a convex point, and a convex point is arranged on the lower end surface of the upper half body at a position corresponding to a concave point, the concave point and the convex point on the upper half body and the convex point and the concave point on the lower half body respectively form a plug-in fit.

[0013] As preferred, the soft iron is in a cylindrical structure arranged vertically, the diameter of the soft iron is greater than the diameter of the needle body, and the sliding cavity is a cylindrical cavity concentric with the soft iron.

[0014] As preferred, the magnetizing unit is a ring-shaped permanent magnet, the inner ring magnetic poles of the ring-shaped permanent magnet are the same, and the ring-shaped permanent magnet is arranged concentrically with the soft iron.

[0015] As preferred, a cylindrical buffer pad for plugging both ends of the sliding cavity is fixedly arranged at the middle of the lower plate surface of the upper cover plate and the upper plate surface of the lower cover plate, and the cylindrical buffer pad is inserted into both ends inside the sliding cavity. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the three-dimensional structure of the lower half body of the shell;

[0017] Figure 2 is a schematic diagram of the internal structure of the present application;

[0018] Figure 3 is a sectional view of the present application;

[0019] Figure 4 is a schematic diagram of the three-dimensional structure of the lower half body of the shell;

[0020] Figure 5 is a schematic diagram of the three-dimensional structure of the upper half body of the shell;

[0021] Figure 6 is a schematic diagram of the magnetic poles when the soft iron is in the upper position;

[0022] Figure 7 is a schematic diagram of the magnetic poles when the soft iron is in the lower position;

[0023] BRIEF DESCRIPTION OF DRAWINGS: 10, shell; 11, sliding cavity; 12, upper cover plate; 13, lower cover plate; 14, buffer pad; 15, upper half body; 16, lower half body; 17, semicircular groove; 18, convex point; 19, concave point; 20, needle body; 21, soft iron; 30, electromagnetic coil; 40, cylindrical permanent magnet. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0025] In the description of the present application, it should be noted that the terms "bottom", "outer wall", "front and back" and the like indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Figure 1

[0026] An electromagnetic needle of a thread accumulator comprises a shell 10 and a needle body 20, a soft iron 21 is fixedly sleeved at the middle part of the needle body 20, a sliding cavity 11 for accommodating the soft iron 21 and allowing the soft iron 21 to slide up and down is formed in the shell 10, an upper cover plate 12 is arranged at the upper end of the sliding cavity 11, a lower cover plate 13 is arranged at the lower end of the sliding cavity 11, through holes for the needle body 20 to pass through are formed in the upper cover plate 12 and the lower cover plate 13, a magnetizing unit for magnetizing the soft iron 21 is fixedly arranged at the middle part of the shell 10 in the up-down direction, the magnetizing unit is sleeved around the soft iron 21 in the circumferential direction, the end of the magnetizing unit close to the soft iron 21 has the same magnetic pole, and electromagnetic coils 30 for attracting or repelling the soft iron 21 are fixedly arranged above and below the magnetizing unit.

[0027] In the above scheme, the soft iron 21 is also called pure electrical iron, and after being magnetized, it will lose its magnetic properties when it is separated from the magnetic field. During use, the soft iron 21 is magnetized by the magnetizing unit, so that the soft iron 21 itself has a magnetic pole. In this way, as long as a small current is passed through the electromagnetic coils 30, the soft iron 21 can be moved. In addition, electromagnetic coils 30 are arranged above and below the soft iron 21. In this way, an attractive force can be formed on one of the electromagnetic coils 30, and a repulsive force can be formed on the other electromagnetic coil 30. The two electromagnetic coils 30 act simultaneously, and the magnetic properties of the soft iron 21 itself after magnetization can greatly improve the performance of the electromagnetic needle and reduce the current in the single electromagnetic coil 30 to reduce heating. In addition, the application does not directly use a permanent magnet as a driving element. After the soft iron 21 is magnetized, its material properties do not change, and it can still withstand high-frequency reciprocating motion. The magnetizing unit can be an electromagnet or a permanent magnet, and the permanent magnet is preferred.

[0028] As a preferred, the spiral winding directions of the two electromagnetic coils 30 are opposite, the two electromagnetic coils 30 are electrically connected with the same current lead wire, and the upper cover plate 12 and the lower cover plate 13 are made of ferromagnetic material. Since the soft iron 21 itself has no magnetic properties, the magnetic pole will also change when the soft iron 21 moves in the magnetic field of the magnetizing unit. As shown in Figure 5 When the soft iron 21 is located at the upper position, due to the magnetization of the magnetizing unit, the upper end of the soft iron 21 is N level and the lower end is S level, as shown in Figure 6 ​As shown, when the soft iron 21 is in the lower position, due to the magnetization of the magnetization unit, the upper end of the soft iron 21 is S level and the lower end is N level. In this way, when the soft iron 21 is in the upper position, both electromagnetic coils 30 are de-energized, and the soft iron 21 can be attracted to the upper cover plate 12 by magnetic force, without the need for the upper electromagnetic coil 30 to be continuously energized to complete the stop of the needle body 20 in the upper position, which can reduce the energization time and reduce the heating. When the soft iron 21 needs to move down, the power supply wire supplies direct current to the two electromagnetic coils 30 at the same time. Due to the same spiral direction of the two electromagnetic coils 30, the lower end of the upper electromagnetic coil 30 forms an N level repelling the soft iron 21, and the upper end of the lower electromagnetic coil 30 forms an N level attracting the soft iron 21, so that the needle body 20 can move downward as a whole. When the soft iron 21 passes the middle position, the two electromagnetic coils 30 are de-energized, and the soft iron 21 reaches the lower position by relying on the magnetic force and inertia, and then is attracted to the lower cover plate 13. When the soft iron 21 needs to move up, the power supply wire supplies direct current to the two electromagnetic coils 30 at the same time. Due to the same spiral direction of the two electromagnetic coils 30, the lower end of the upper electromagnetic coil 30 forms an N level attracting the soft iron 21, and the upper end of the lower electromagnetic coil 30 forms an N level repelling the soft iron, so that the needle body 20 can move upward as a whole. When the soft iron 21 passes the middle position, the two electromagnetic coils 30 are de-energized, and the soft iron 21 reaches the upper position by relying on the magnetic force and inertia, and then is attracted to the upper cover plate 12. In the above scheme, only the two electromagnetic coils 30 are energized for a short time when the soft iron 21 moves to the middle position, and since the two electromagnetic coils 30 act at the same time, only a small current is needed, greatly shortening the energization time and current size, reducing the heating of the entire electromagnetic needle, and also improving the response speed of the electromagnetic needle and enhancing its performance.

[0029] As a preferred, the magnetization unit comprises an even number of same columnar permanent magnets 40, which are uniformly spaced around the soft iron 21, the axis of the columnar permanent magnets 40 is towards the soft iron 21, and the poles of all the columnar permanent magnets 40 close to the soft iron 21 are the same. The columnar permanent magnets 40 are relatively common and are easy to install and arrange directly.

[0030] As a preferred, the shell 10 is a cylindrical structure arranged vertically, a plurality of radial circular holes for accommodating the columnar permanent magnets 40 are formed on the outer peripheral wall of the shell 10, and the cylindrical sliding cavity 11 is concentric with the cylindrical shell 10. The uniformity of the entire shell 10 is improved, and the uniform shell 10 facilitates uniform arrangement of the columnar permanent magnets 40. The columnar permanent magnets 40 are fixed in the radial circular holes by using glue.

[0031] As a preferred, the shell 10 comprises an upper half 15 and a lower half 16, a plurality of semicircular grooves 17 for enclosing the radial circular holes are formed on the upper end face of the lower half 16 and the upper end face of the upper half 15. The split shell 10 facilitates the installation of the internal components. The upper half 15 and the lower half 16 are respectively provided with electromagnetic coils 30.

[0032] As preferred, a plurality of convex points 18 are arranged on the upper end surface of the lower half body 16 in uniform intervals in the circumferential direction, a plurality of concave points 19 are arranged on the upper end surface of the lower half body 16 in uniform intervals in the circumferential direction, the lower end surface of the upper half body 15 is provided with concave points 19 at positions corresponding to the convex points 18, the lower end surface of the upper half body 15 is provided with convex points 18 at positions corresponding to the concave points 19, and the concave points 19 and the convex points 18 on the upper half body 15 and the convex points 18 and the concave points 19 on the lower half body 16 form a plug-in fit, respectively. The centers of the convex points 18 and the concave points 19 are on the same virtual circle and the number of the convex points 18 and the concave points 19 is the same, the circumferential interval distance of the convex points 18 and the concave points 19 is the same, the upper half body 15 and the lower half body 16 have the same structure, and the convex points 18 and the concave points 19 can be aligned by rotating the upper half body 15 and the lower half body 16 out of position when in use. The same upper half body 15 and the lower half body 16 only need to use one mold to complete production, thereby reducing production costs.

[0033] As preferred, the soft iron 21 has a vertical cylindrical structure, the diameter of the soft iron 21 is greater than the diameter of the needle body 20, and the sliding cavity 11 is a cylindrical cavity concentric with the soft iron 21. In this way, the through hole on the upper cover plate 12 and the lower cover plate 13 only needs to pass through the needle body 20, and then blocks the soft iron 21 to limit it.

[0034] As preferred, the magnetization unit is a ring-shaped permanent magnet, the inner ring magnetic poles of the ring-shaped permanent magnet are the same, and the ring-shaped permanent magnet is arranged concentrically with the soft iron 21. The magnetic field of the ring-shaped permanent magnet is more uniform.

[0035] As preferred, the middle part of the lower plate surface of the upper cover plate 12 and the upper plate surface of the lower cover plate 13 are fixedly provided with cylindrical buffer pads 14 for plugging both ends of the sliding cavity 11, and the cylindrical buffer pads 14 are inserted into both ends of the sliding cavity 11. The buffer pad 14 can be a rubber material, which can slow down the impact on the soft iron 21 and prolong its service life.

[0036] Although the present application discloses the above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. An electromagnetic needle of a thread accumulator, characterized in that: The utility model provides a kind of needle magnetizer, including shell (10) and needle body (20), the middle part of the needle body (20) is fixedly sleeved with soft iron (21), the shell (10) is opened in and is used to accommodate soft iron (21) and is slid up and down the sliding cavity (11) for it, the upper end of the sliding cavity (11) is provided with upper cover plate (12), the lower end of the sliding cavity (11) is provided with lower cover plate (13), the upper cover plate (12) and lower cover plate (13) are all opened with the through hole for needle body (20) to pass through, the middle part of the shell (10) is fixedly provided with magnetization unit for magnetizing soft iron (21) in upper and lower directions, the magnetization unit is sleeved in the circumference of soft iron (21), the end of the magnetization unit close to soft iron (21) is same in magnetic polarity, the upper and lower of the magnetization unit is fixedly provided with electromagnetic coil (30) for attracting or repelling soft iron (21), the spiral winding direction of two the electromagnetic coil (30) is opposite, two the electromagnetic coil (30) is electrically connected with same electric current wire, the upper cover plate (12) and lower cover plate (13) are made of ferromagnetic material;The magnetization unit includes even number of same columnar permanent magnet (40), the columnar permanent magnet (40) is evenly spaced in the circumference of soft iron (21), the columnar permanent magnet (40) axis center is towards soft iron (21), all the columnar permanent magnet (40) is same in magnetic polarity at the end close to soft iron (21); The shell (10) includes upper half body (15) and lower half body (16), the upper end surface of the lower half body (16) and the upper end surface of the upper half body (15) are opened with a plurality of semicircular grooves (17) for enclosing to form radial circular holes;The upper end surface of the lower half body (16) is circumferentially and evenly spaced with a plurality of convex points (18), the upper end surface of the lower half body (16) is circumferentially and evenly spaced with a plurality of concave points (19), the lower end surface of the upper half body (15) is provided with a concave point (19) at the position corresponding to the convex point (18), the lower end surface of the upper half body (15) is provided with a convex point (18) at the position corresponding to the concave point (19), the concave point (19) and the convex point (18) on the upper half body (15) and the convex point (18) and the concave point (19) on the lower half body (16) respectively form a plug-in fit.

2. The electromagnetic needle of the thread accumulator according to claim 1, characterized in that: The shell (10) is vertically arranged cylindrical structure, the outer peripheral wall of the shell (10) is opened with a plurality of radial circular holes for accommodating columnar permanent magnet (40), the sliding cavity (11) of cylindrical shape is concentric with the cylindrical shell (10).

3. The electromagnetic needle of the thread accumulator according to claim 1, characterized in that: The soft iron (21) is vertically arranged cylindrical structure, the diameter of the soft iron (21) is greater than the diameter of the needle body (20), the sliding cavity (11) is a cylindrical cavity concentric with the soft iron (21).

4. The electromagnetic needle of the thread accumulator according to claim 3, characterized in that: The magnetization unit is annular permanent magnet, the inner ring magnetic pole of the annular permanent magnet is same, the annular permanent magnet is concentrically arranged with the soft iron (21).

5. The electromagnetic needle of the thread accumulator according to claim 4, characterized in that: The lower plate surface of the upper cover plate (12) and the upper plate surface of the lower cover plate (13) are both fixedly provided with cylindrical buffer pad (14) for plugging both ends of the sliding cavity (11), the cylindrical buffer pad (14) is inserted into both ends inside the sliding cavity (11).

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