Magnetic circuit structure of needle selection device and needle selection device equipped with magnetic circuit structure

Abstract

The electromagnet comprises the electromagnet, armatures, a rotating shaft and springs, each armature is composed of a hook part, a spring force exerting part, a magnetic pole part, a straight rod part, a hole wall part and a shaft hole, the armatures are located on the two sides of the electromagnet, and the springs are arranged between the spring force exerting parts of the armatures and an electromagnet support. The electromagnet is formed by winding an I-shaped iron core with a coil, two cross beam magnetic poles of the I-shaped iron core, a magnetic pole part of the armature and a straight rod part form a closed magnetic circuit, the rotating shaft is arranged outside the closed magnetic circuit, a shaft hole of the armature is formed in the rotating shaft, and a hole wall part does not participate in a magnetic conduction path of the closed magnetic circuit. And the straight rod part of the armature and one cross beam magnetic pole of the I-shaped iron core are always in magnetic circuit connection with low magnetic resistance. Large magnetic resistance caused by a rotating shaft magnetic gap is eliminated, the efficiency of the electromagnet is improved, the rotating shaft does not need to bear the gravity of controlling the magnetic gap precision, the rotating flexibility is improved, the length of the armature is shortened, the weight is reduced, and the overall structure of the needle selecting device is compact.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic jacquard machines of textile machinery, and in particular relates to a magnetic circuit structure of a needle selection device and a needle selection device equipped with the magnetic circuit structure. Background Art

[0002] In recent years, electronic jacquard machines have made great progress. Electronic jacquard machines use a key component called the needle selection device (also called solenoid valve, electromagnet, component, etc.). The needle selection device is the executive component of the electronic jacquard machine. There is an electromagnet in the needle selection device. Whether the electromagnet coil is energized corresponds to the presence or absence of electromagnetic force. Then, through a set of mechanisms, the electrical signal is converted into the rise and fall of the warp yarn. Therefore, the electromagnet is the key component in the needle selection device to realize the electromechanical action conversion.

[0003] The electromagnet of the needle selection device includes an iron core, a coil, an armature, a rotating shaft, a spring and other parts. The armature has a hook part, a magnetic pole part, a straight rod part, a curved hole wall part and an axial hole surrounded by the hole wall. The axial hole can be fitted on the rotating shaft and can rotate around the rotating shaft. The iron core and the armature are made of materials with high magnetic permeability and low residual magnetism to form the magnetic circuit of the electromagnet.

[0004] The working principle of the needle selection device and its electromagnet is a well-known technology. It is similar to the principle of an electromagnetic relay and is a monostable device: when the coil is not energized, there is no electromagnetic force and the armature is not attracted. Under the action of the reset spring, the armature magnetic pole is away from the iron core magnetic pole and is in position 1 (stable position); when the coil is energized, an electromagnetic force is generated to attract the armature, and the armature magnetic pole is attracted to the iron core magnetic pole, and the armature is in position 2 (temporary steady state position).

[0005] In the needle selection device, the armature is made into a hook shape, called an armature hook, and there is also a vertical hook that can move up and down with the jacquard knife. When the vertical hook is unhooked from the armature hook, it is called the "unhooked" state, and the vertical hook moves with the knife; when the vertical hook is hooked on the armature hook, it is called the "hung" state, and the vertical hook is separated from the knife and does not move with the knife. It can usually be designed that position 1 (stable position) is the "hung" state, and position 2 (temporary steady position) is the "unhooked" state, or vice versa. Since the vertical hook connects the harness and the heald to control the warp yarn, the rise and fall of the vertical hook corresponds to the rise and fall of the warp yarn.

[0006] The difference between the needle selection device and the electromagnetic relay is that the armature of the electromagnetic relay is not subjected to force, while the armature / armature hook in the needle selection device is a force-bearing part. When the vertical hook is hooked on the armature hook in the "hanging" state, the force of the wire connected to the vertical hook and the wire spring is all applied to the armature hook, and then applied to the rotating shaft through the armature hook. For some needle selectors, the design index of this force is 1kg, and for other applications, the design index of this force may be higher. This limits the needle selection device electromagnet from being able to use a very lightweight design solution like the commonly used electromagnetic relay.

[0007] The existing electromagnet solution is: the iron core adopts an I-shaped iron core, and the crossbeam extending from the I-shaped iron core forms two magnetic poles, which form a closed magnetic circuit with the straight armature. There is a hole in the middle of the armature, which can be mounted on the rotating shaft. The center of the rotating shaft is located at the extension of one of the magnetic poles. In this way, the curved hole wall of the armature is the only way for the electromagnet magnetic circuit. In order for the armature to rotate flexibly around the rotating shaft, a gap is left between the curved hole wall of the armature and the magnetic pole of the iron core, which is called the "rotating shaft magnetic gap". The magnetic permeability of air is extremely low, so a very small magnetic gap will also produce magnetic resistance. The advantage of the "rotating shaft magnetic gap" solution is that when the armature rotates around the rotating shaft at a small angle, the distance formed by the curved hole wall of the armature and the magnetic pole of the iron core remains unchanged, so the gap remains unchanged and the magnetic resistance remains unchanged.

[0008] China invented "yarn selection device, double shed weaving system and loom equipped with the weaving system", patent number 98116491.9, the electromagnet part of the yarn selection device adopts the aforementioned "rotating shaft magnetic gap" solution. The disadvantages of this solution are:

[0009] 1. The magnetic gap of the rotating shaft is a designed magnetic gap. In order to rotate flexibly, the magnetic gap cannot be too small. This is a fixed magnetic resistance in the magnetic circuit of the electromagnet. The hole wall is the necessary path of the magnetic circuit. The cross-section of the hole wall is usually smaller than the rod, which also forms a magnetic resistance. When other parameters of the electromagnet are the same, due to the existence of these magnetic resistances, the efficiency of the electromagnet is affected and the electromagnetic force is not high.

[0010] 2. The magnetic gap of the rotating shaft is related to many factors in actual production: the arc shape and size control of the I-shaped core end, the inner and outer shapes and size control of the armature hole wall, the position of the rotating shaft and the core, the size matching and tolerance of the rotating shaft and the armature hole, the verticality of the rotating shaft and the core plane, the influence of temperature rise, vibration, deformation, etc. during operation. In mass production, the above factors must be strictly controlled, otherwise it is very easy to cause batch quality problems of the needle selection device.

[0011] 3. The movement resistance of the armature on the rotating shaft is related to the electromagnetic force. The armature that rotates flexibly when the coil is not energized may not be flexible when the coil is energized because the electromagnetic force causes the wall of the armature hole to be subjected to additional pressure. This becomes a contradictory factor in the design of the electromagnet, that is, when the electromagnetic force of the electromagnet is increased, the movement resistance of the armature is also increased. Summary of the invention

[0012] In order to make up for the deficiencies of the above-mentioned prior art, the present invention provides a magnetic circuit structure of a needle selection device and a needle selection device equipped with the magnetic circuit structure.

[0013] In order to solve the above technical problems and achieve the above technical effects, the present invention is implemented through the following technical solutions:

[0014] A magnetic circuit structure of a needle selection device, comprising an electromagnet, an armature, a rotating shaft and a spring, wherein the armature is composed of a hook portion, a spring force portion, a magnetic pole portion, a straight rod portion, a hole wall portion and an axial hole surrounded by the hole wall portion in sequence, two armatures are located on the left and right sides of the electromagnet, one end of the spring is connected to the spring force portion of the armature, and the other end of the spring is connected to the electromagnet bracket of the needle selection device, the electromagnet is formed by winding a coil around an I-shaped iron core, the upper and lower ends of the I-shaped iron core are two crossbeam magnetic poles, and one of the two crossbeam magnetic poles The side surfaces form a closed magnetic circuit after respectively contacting the magnetic pole portion and the straight rod portion of the armature, the rotating shaft is arranged on a needle selection device substrate located outside the closed magnetic circuit, the axial hole of the armature is installed on the rotating shaft, the hole wall portion does not participate in the magnetic conductive path of the closed magnetic circuit, and when the armature rotates around the rotating shaft at a small angle, no matter whether the magnetic pole portion of the armature and one crossbeam magnetic pole of the I-beam core are in an open magnetic gap state or a closed magnetic circuit state, the straight rod portion of the armature and the other crossbeam magnetic pole of the I-beam core always maintain a low magnetic resistance magnetic circuit connection.

[0015] Furthermore, a magnetically conductive elastic member is installed between the straight rod portion of the armature and another crossbeam magnetic pole of the I-beam core to maintain a magnetic circuit connection with low magnetic resistance between the two.

[0016] Furthermore, the magnetic elastic member is a square member, an O-shaped member, a U-shaped member, a V-shaped member made of a magnetic plastic sheet, or an elastic member made of a Permalloy material, or an elastic block member made of a magnetic sponge plastic.

[0017] Furthermore, when the armature rotates at a small angle around the rotating shaft, no matter whether the magnetic pole portion of the armature and one crossbeam magnetic pole of the I-beam core are in an open magnetic gap state or a closed magnetic circuit state, one side surface of the straight rod portion of the armature always maintains sliding contact with the side surface of the other crossbeam magnetic pole of the I-beam core to maintain a low magnetic resistance magnetic circuit connection between the two.

[0018] Furthermore, the two cross-beam magnetic poles of the I-beam core are arranged in a front-to-back offset form, and the offset amplitude of the two cross-beam magnetic poles is equal to the thickness of the straight rod portion of the armature; one side surface of the magnetic pole portion of the armature is aligned with the side surface of one cross-beam magnetic pole of the I-beam core, and the straight rod portion of the armature is located on a surface of another cross-beam magnetic pole of the I-beam core; when the armature rotates around the rotating shaft at a certain angle, one side surface of the straight rod portion of the armature and the surface of the other cross-beam magnetic pole of the I-beam core have a sliding displacement and always maintain close contact, and when in a closed magnetic circuit state, one side surface of the magnetic pole portion of the armature maintains close contact with the side surface of one cross-beam magnetic pole of the I-beam core.

[0019] Furthermore, the two crossbeam poles of the I-beam core are provided with torsional bends in opposite front-to-rear directions, wherein the outer side surface of the torsional bend of one of the crossbeam poles serves as the attraction pole surface of the armature magnetic pole portion, and the upper surface of the torsional bend of the other crossbeam pole serves as the sliding pole surface of the armature straight rod portion, and the misalignment amplitude of the torsional bends of the two crossbeam poles is equal to the thickness of the straight rod portion of the armature; the straight rod portion of the armature is located above the sliding pole surface of the straight rod portion of the armature, and one side surface of the magnetic pole portion of the armature is aligned with the attraction pole surface of the magnetic pole portion of the armature; when the armature rotates around the rotating shaft at a certain angle, one side surface of the straight rod portion of the armature has a sliding displacement with the sliding pole surface of the straight rod portion of the armature, and always maintains close contact, and when in a closed magnetic circuit state, one side surface of the magnetic pole portion of the armature maintains close contact with the attraction pole surface of the magnetic pole portion of the armature.

[0020] Furthermore, one of the crossbeam poles of the I-beam core is provided with a torsion bend, and its surface serves as a sliding pole surface of the straight rod portion of the armature. The other crossbeam pole of the I-beam core remains straight, and its outer surface serves as an engaging pole surface of the armature pole portion. There is a front-to-rear misalignment between the crossbeam pole with the torsion bend and the crossbeam pole that remains straight, and the misalignment amplitude is equal to the thickness of the straight rod portion of the armature. The straight rod portion of the armature is located above the sliding pole surface of the straight rod portion of the armature, and one side surface of the pole portion of the armature is aligned with the engaging pole surface of the pole portion of the armature. When the armature rotates at a certain angle around the rotating shaft, there is a sliding displacement between one side surface of the straight rod portion of the armature and the sliding pole surface of the straight rod portion of the armature, and they always maintain close contact. When in a closed magnetic circuit state, one side surface of the pole portion of the armature maintains close contact with the engaging pole surface of the pole portion of the armature.

[0021] Furthermore, magnetic plastic covers are respectively provided at the twisted bends at both ends of the beam pole close to the hole wall portion, and a groove is formed between the magnetic plastic cover and the beam pole for facilitating the embedding of the straight rod portion, and a magnetic elastic part for contacting the straight rod portion is provided in the groove.

[0022] Furthermore, in the armature, the hook portion and the spring force portion are located at one end of the straight rod portion, and the hook portion and the spring force portion are respectively located on the left and right sides of the straight rod portion, a section of the straight rod portion close to the hook portion serves as the magnetic pole portion, the hole wall portion is located at the other end of the straight rod portion, and the axial hole is concentric with the hole wall portion.

[0023] The present invention also discloses a needle selection device, which is equipped with the magnetic circuit structure of the needle selection device disclosed above.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The electromagnet of the present invention eliminates the large magnetic resistance caused by the "rotating shaft magnetic gap" used in the prior art, thereby improving the efficiency of the electromagnet.

[0026] 2. The electromagnet of the present invention has few factors that affect the magnetic resistance of the circuit, which is convenient for quality control in mass production.

[0027] 3. The rotating shaft of the electromagnet of the present invention is not on a closed magnetic circuit, the movement resistance of the rotating shaft is independent of the electromagnetic force, and the rotating shaft does not have to bear the heavy responsibility of controlling the accuracy of the magnetic gap, so a loose design can be adopted to improve the flexibility of the rotating shaft.

[0028] 4. The armature length of the electromagnet of the present invention is shortened and the weight is reduced, so that the overall structure of the needle selection device using the electromagnet is compact.

[0029] 5. The armature of the electromagnet of the present invention contacts the side of the I-beam core crossbeam. Under the action of the electromagnetic force, the armature and the magnetic poles of the I-beam core can be automatically aligned.

[0030] 6. The center line of the vertical hook of the needle selection device of the present invention and the center line of the I-beam core can be designed to be aligned or deviated by a required distance, which provides a flexible arrangement scheme for the design that requires two electromagnets to be stacked one above the other.

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 It is a structural diagram of the I-shaped iron core, the square magnetic elastic member and the armature in the first embodiment of the electromagnet of the present invention when forming a closed magnetic circuit;

[0034] Figure 2 It is a structural diagram of the I-shaped iron core, the O-shaped magnetic elastic member and the armature in the first embodiment of the electromagnet of the present invention when forming a closed magnetic circuit;

[0035] Figure 3 It is a structural diagram of the I-shaped iron core, the U-shaped magnetic elastic member and the armature in the first embodiment of the electromagnet of the present invention when forming a closed magnetic circuit;

[0036] Figure 4It is a schematic structural diagram of an I-shaped iron core in a second embodiment of an electromagnet of the present invention;

[0037] Figure 5 It is a structural diagram of the I-shaped iron core and the armature in the second embodiment of the electromagnet of the present invention when forming a closed magnetic circuit;

[0038] Figure 6 The structure diagram of the I-shaped iron core, magnetic plastic upper cover, magnetic elastic member and armature in the third embodiment of the electromagnet of the present invention when forming a closed magnetic circuit

[0039] Figure 7 It is a structural diagram of an I-shaped iron core and an armature in a fourth embodiment of an electromagnet of the present invention when forming a closed magnetic circuit;

[0040] Figure 8 It is a structural diagram of an I-shaped iron core, a magnetic plastic upper cover, a magnetic elastic member and an armature in a fifth embodiment of the electromagnet of the present invention when forming a closed magnetic circuit;

[0041] Fig. 9 It is a structural schematic diagram of a first embodiment of a needle selection device of the present invention;

[0042] Fig.10 It is a schematic structural diagram of a second embodiment of the needle selection device of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. The descriptions herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0044] See also Figure 1-6As shown, a magnetic circuit structure of a needle selection device includes an electromagnet 1, an armature 3, a rotating shaft 4 and a spring 5, wherein the armature 3 is composed of a hook portion 301, a spring force portion 302, a magnetic pole portion 303, a straight rod portion 304, a hole wall portion 305 and an axial hole 306 surrounded by the hole wall portion 305 in sequence, two armatures 3 are located on the left and right sides of the electromagnet 1, one end of the spring 5 is connected to the spring force portion 302 of the armature 3, and the other end of the spring 5 is connected to the electromagnet bracket 2 of the needle selection device, the electromagnet 1 is formed by winding a coil on the outside of an I-shaped iron core 101, and the front and rear ends of the I-shaped iron core 101 are two beam magnetic poles 102, and the two beam magnetic poles A side surface of 102 forms a closed magnetic circuit after contacting the magnetic pole portion 303 and the straight rod portion 304 of the armature 3 respectively, the rotating shaft 4 is arranged on the needle selection device substrate 9 located outside the closed magnetic circuit, the axial hole 306 of the armature 3 is installed on the rotating shaft 4, the hole wall portion 305 does not participate in the magnetic conductive path of the closed magnetic circuit, and when the armature 3 rotates around the rotating shaft 4 at a small angle, no matter whether the magnetic pole portion 303 of the armature 3 and one beam magnetic pole 102 of the I-beam core 101 are in an open magnetic gap state or a closed magnetic circuit state, the straight rod portion 304 of the armature 3 and the other beam magnetic pole 102 of the I-beam core 101 always maintain a low magnetic resistance magnetic circuit connection.

[0045] Based on the above features, the present invention can be designed into the following embodiments:

[0046] Example 1

[0047] See also Figure 1 As shown, a magnetically conductive elastic member 6 is installed between the straight rod portion 304 of the armature 3 and the other crossbeam magnetic pole 102 of the I-beam core 1 to maintain a magnetic circuit connection with low magnetic resistance between the two. The magnetically conductive elastic member 6 is a square member made of a magnetically conductive plastic sheet.

[0048] from Figure 1 It can be clearly seen that the shaft 4 is outside the closed magnetic circuit of the electromagnet. When the armature 3 rotates around the shaft 4 at a small angle, in addition to the magnetic pole portion 303 of the armature 3 moving away from the beam magnetic pole 102 above the I-shaped iron core 1, the lower end of the straight rod portion 304 of the armature 3 also moves away from the beam magnetic pole 102 below the I-shaped iron core 101, resulting in a magnetic gap.

[0049] Therefore, in order to maintain the connection of the magnetic circuit, a magnetically conductive elastic member 6 is used in this embodiment, which is a U-shaped member made of a magnetically conductive plastic sheet. The U-shaped member has a certain elasticity, and when the straight rod portion 304 of the armature 3 leaves the crossbeam magnetic pole 102 below the I-shaped iron core 101, the two ends can still abut against the straight rod portion 304 of the armature 3 and the end of the crossbeam magnetic pole 102 below the I-shaped iron core 101 to maintain the connection of the magnetic circuit. The magnetically conductive elastic member 6 can also be made of a permalloy material, or a block-shaped member made of a magnetically conductive sponge plastic.

[0050] This solution is suitable for the case where the I-core 101 is relatively long. The longer the I-core 101 is, the longer the straight rod portion 304 of the armature 3 is. When the magnetic pole opening gap state is constant, the displacement of the beam pole 102 under the I-core 101 that needs to be filled by the magnetic elastic member 6 is smaller.

[0051] Furthermore, in addition to using the magnetically conductive elastic member 6 to maintain the low magnetic resistance magnetic circuit connection between the straight rod portion 304 of the armature 3 and the other beam magnetic pole 102 of the I-beam core 101, a sliding connection method can also be used. That is, when the armature 3 rotates around the rotating shaft 4 at a small angle, no matter whether the magnetic pole portion 303 of the armature 3 and the one beam magnetic pole 102 of the I-beam core 101 are in an open magnetic gap state or a closed magnetic circuit state, one side surface of the straight rod portion 304 of the armature 3 and the side surface of the other beam magnetic pole 102 of the I-beam core 101 always maintain sliding contact, thereby maintaining a low magnetic resistance magnetic circuit connection between the two.

[0052] In order to realize the side sliding connection solution, it is possible to adopt the design of twisting and bending the beam or twisting and bending the straight armature rod. However, considering that the armature and the rotating shaft are force-bearing parts, in order to maintain good force-bearing characteristics, the following embodiments of the present invention choose to twist and bend the beam poles, while keeping the straight armature rod straight.

[0053] See also Figure 2 As shown, the magnetic conductive elastic member 6 can also be an O-shaped member made of a magnetic conductive plastic sheet. Figure 3 As shown, the magnetic elastic member 6 may also be a U-shaped member made of a magnetic plastic sheet. Of course, the magnetic elastic member 6 may also be a V-shaped member made of a magnetic plastic sheet.

[0054] In addition to being made of magnetic conductive plastic sheet material, the magnetic conductive elastic member 6 can also be an elastic member made of Permalloy material, or an elastic block member made of magnetic conductive sponge plastic.

[0055] Example 2

[0056] See also Figure 4-5As shown, the two beam poles 102 of the I-shaped core 101 are provided with torsional bends in opposite front-to-back directions, wherein the outer side surface of the torsional bend of one of the beam poles 102 serves as the magnetic pole surface of the armature magnetic pole portion, and the upper surface of the torsional bend of the other beam pole 102 serves as the sliding magnetic pole surface of the armature straight rod portion, and the misalignment amplitude of the torsional bends of the two beam poles 102 is equal to the thickness of the straight rod portion 304 of the armature 3; the straight rod portion 304 of the armature 3 is located at the On the sliding magnetic pole surface of the straight rod portion of the armature, one side surface of the magnetic pole portion 303 of the armature 3 is aligned with the attractive magnetic pole surface of the armature magnetic pole portion; when the armature 3 rotates around the rotating shaft 4 at a certain angle, one side surface of the straight rod portion 304 of the armature 3 is slidingly displaced with the sliding magnetic pole surface of the straight rod portion of the armature, and they always maintain close contact. When in a closed magnetic circuit state, one side surface of the magnetic pole portion 303 of the armature 3 is in close contact with the attractive magnetic pole surface of the armature magnetic pole portion.

[0057] from Figure 4 It can be clearly seen that the two cross-beam poles 102 of the I-shaped core 101 of this embodiment are torsionally misaligned and are not in the same plane. What is used are two mutually orthogonal pole faces, namely the sliding pole face of the armature straight rod part and the attracting pole face of the armature pole part. Figure 5 It can be clearly seen that the rotating shaft 4 is outside the closed magnetic circuit, and the hole wall portion 305 does not participate in the magnetic path of the closed magnetic circuit. This design not only allows the magnetic pole portion 303 of the armature 3 to be aligned with a beam magnetic pole 102 of the I-shaped iron core 101 in height position, so that the magnetic pole portion 303 of the armature 3 can just be in close contact with the end face of a beam magnetic pole 102 of the I-shaped iron core 101 when the magnetic circuit is closed, but also allows one side of the straight rod portion 304 of the armature 3 to maintain sliding contact with the surface of another beam magnetic pole 102 of the I-shaped iron core 101 when the armature 3 rotates around the rotating shaft 4 at a certain angle, thereby maintaining a magnetic circuit connection with low magnetic resistance.

[0058] Example 3

[0059] See also Figure 6 As shown, on the basis of Example 2, a magnetic plastic upper cover 103 can be respectively provided at the left and right ends of the torsion bend on the front side surface of the beam pole 102 close to the hole wall portion 305, and the two magnetic plastic upper covers 103 are spaced apart from the front side surfaces of the torsion bends on the left and right ends, thereby forming two left and right grooves for facilitating the embedding of the straight rod portion 304, and a magnetic elastic member 6 for contacting the straight rod portion 304 is provided in the groove.

[0060] Compared with Example 2, this Example 3 adds a magnetic conductive plastic upper cover, thereby upgrading the single-sided magnetic conductivity to double-sided magnetic conductivity, and is filled with magnetic conductive elastic parts to become three-sided magnetic conductivity, so the magnetic conductive effect is better.

[0061] Example 4

[0062] See also Figure 7 As shown, one of the beam poles 102 of the I-shaped iron core 101 is provided with a torsion bend, and its upper surface serves as the sliding pole surface of the armature straight rod portion, and the other beam pole 102 of the I-shaped iron core 101 remains straight, and its outer surface serves as the attracting pole surface of the armature pole portion, and the beam pole 102 with the torsion bend is misaligned with the beam pole 102 that remains straight in the front-to-back direction, and the misalignment amplitude is equal to the thickness of the straight rod portion 304 of the armature 3; the straight rod portion 304 of the armature 3 Located on the sliding magnetic pole surface of the straight rod portion of the armature, one side surface of the magnetic pole portion 303 of the armature 3 is aligned with the attraction magnetic pole surface of the armature magnetic pole portion; when the armature 3 rotates around the rotating shaft 4 at a certain angle, one side surface of the straight rod portion 304 of the armature 3 has a sliding displacement with the sliding magnetic pole surface of the straight rod portion of the armature, and always maintains close contact with it. When in a closed magnetic circuit state, one side surface of the magnetic pole portion 303 of the armature 3 maintains close contact with the attraction magnetic pole surface of the armature magnetic pole portion.

[0063] from Figure 7 It can be clearly seen that only the beam magnetic pole 102 used for armature attraction of the I-shaped iron core 101 in this embodiment has a torsion bend, while the beam magnetic pole 102 used for armature sliding displacement remains straight and does not twist. Similarly, the shaft 4 of this embodiment is outside the closed magnetic circuit, and the hole wall portion 305 does not participate in the magnetic conduction path of the closed magnetic circuit. This design can also allow the magnetic pole portion 303 of the armature 3 to be aligned with the straight beam magnetic pole 102 of the I-shaped iron core 101 in height position, so that when the magnetic circuit is closed, the magnetic pole portion 303 of the armature 3 can just be in close contact with the end face of the straight beam magnetic pole 102 of the I-shaped iron core 101, and at the same time, when the armature 3 rotates around the shaft 4 at a certain angle, one side of the straight rod portion 304 of the armature 3 can be in sliding contact with the surface of the torsion bend beam magnetic pole 102 of the I-shaped iron core 101, thereby maintaining a magnetic circuit connection with low magnetic resistance.

[0064] Example 5

[0065] See also Figure 8 As shown, on the basis of Example 4, a magnetic plastic upper cover 103 can be respectively provided at the left and right ends of the torsion bend at the front side surface of the beam pole 102 close to the hole wall portion 305, and the two magnetic plastic upper covers 103 are spaced apart from the front side surfaces of the torsion bends at the left and right ends, thereby forming two left and right grooves for facilitating the embedding of the straight rod portion 304, and a magnetic elastic member 6 for contacting the straight rod portion 304 is provided in the groove.

[0066] Compared with the fourth embodiment, the fifth embodiment adds a magnetic conductive plastic upper cover, thereby upgrading the single-sided magnetic conductivity to double-sided magnetic conductivity, and is filled with magnetic conductive elastic parts to become three-sided magnetic conductivity, so the magnetic conductive effect is better.

[0067] It should be noted that the above embodiments do not have no magnetic resistance, but the contact magnetic resistance of the two magnetic conductive surfaces is much smaller than the magnetic resistance of the rotating shaft magnetic gap that must leave an air magnetic gap, and is easy to control the quality in mass production. Therefore, these solutions can produce positive effects.

[0068] The above embodiments have another common point, that is, in the armature 3, the hook portion 301 and the spring force portion 302 are located at one end of the straight rod portion 304, and the hook portion 301 and the spring force portion 302 are respectively located on the left and right sides of the straight rod portion 304, and a section of the straight rod portion 304 close to the hook portion 301 serves as the magnetic pole portion 303, the hole wall portion 305 is located at the other end of the straight rod portion 304, and the shaft hole 306 is concentric with the hole wall portion 305. Such a design shortens the length of the armature, reduces the weight, and makes the overall structure of the needle selection device compact.

[0069] It should also be noted that the present invention does not specifically limit which of the two beam poles 102 of the I-shaped iron core 101 is used as the armature pole for adsorption and which is used as the low magnetic resistance magnetic circuit connection. Figure 1-3 In the embodiment, the shaft 4 is designed to be below the I-shaped iron core 101, and the hook portion 301 of the armature 3 is above the I-shaped iron core 101. At this time, the force on the shaft 4 is the pressure of the hook portion 301; Figure 4-8 In the embodiment, the shaft 4 is designed to be above the I-shaped core 101, and the hook portion 301 of the armature 3 is designed to be below the I-shaped core 101. At this time, the force on the shaft 4 is the pulling force of the hook portion 301.

[0070] In addition to providing an electromagnet for a needle selection device, the present invention also provides a needle selection device equipped with the magnetic circuit structure.

[0071] Example 6

[0072] See also Fig. 9 As shown, the needle selection device of this embodiment adopts an electromagnet solution in which the rotating shaft 4 is below the electromagnet 1 and the hook portion 301 of the armature 3 is above the electromagnet 1, such as the solution of Example 1.

[0073] from Fig. 9It can be clearly seen that the armature 3 and the vertical hook 7 on the right side of the needle selection device are in the "disengaged" state, and the armature 3 on the right side is in the magnetic pole position pushed to the right side of the electromagnet 1 by the convex edge 8 on the right vertical hook 7, that is, the position of the dynamic magnetic gap a. When the vertical hook 7 on the right side moves downward, it can be unhooked, because the spring 5 on the right side is compressed at this time. As long as the suction force of the electromagnet 1 on the right side is greater than the elastic force of the spring 5 on the right side, when the vertical hook 7 on the right side moves downward, even without the effect of the convex edge 8 on the vertical hook 7 on the right side, the armature 3 on the right side will be maintained in this closed magnetic circuit position by electromagnetic force.

[0074] The armature 3 and the vertical hook 7 on the left side of the needle selection device are in a "hanging" state. The armature 3 on the left side is pushed by the spring 5 on the left side to a magnetic pole position away from the electromagnet 1, and the vertical hook 7 on the left side is hung, forming a relatively large static magnetic gap b.

[0075] The lateral displacement of the armature is actually the rotation around the shaft 4. In this embodiment, the shaft 4 is below the armature 3, and the vertical hook 7 is actually pressed on the armature 3. Therefore, the armature 3 must be rigid. Usually, the armature 3 is made of soft iron material, and its rigidity can meet the vertical hook pressure. The vertical hook guide rails on both sides of the needle selection device substrate 9 are engaged with the convex edges on the rod body of the vertical hook 7 to ensure that the vertical hook 7 has no lateral displacement when moving up and down.

[0076] Example 7

[0077] See also Fig.10 As shown, the needle selection device of this embodiment adopts an electromagnet solution in which the rotating shaft 4 is above the electromagnet 1 and the hook portion 301 of the armature 3 is below the electromagnet 1, such as the solution of embodiments 2-5.

[0078] from Fig.10 It can be clearly seen that the armature 3 and the vertical hook 7 on the right side of the needle selection device are in the "disengaged" state, and the armature 3 on the right side is in the magnetic pole position pushed to the right side of the electromagnet 1 by the convex edge 8 on the right vertical hook 7, that is, the position of the dynamic magnetic gap a. When the vertical hook 7 on the right side moves downward, it can be unhooked, because the spring 5 on the right side is compressed at this time. As long as the suction force of the electromagnet 1 on the right side is greater than the elastic force of the spring 5 on the right side, when the vertical hook 7 on the right side moves downward, even without the effect of the convex edge 8 on the vertical hook 7 on the right side, the armature 3 on the right side will be maintained in this closed magnetic circuit position by electromagnetic force.

[0079] The armature 3 and the vertical hook 7 on the left side of the needle selection device are in a "hanging" state. Under the elastic force of the spring 5 on the left side, the armature 3 on the left side is pushed away from the magnetic pole position of the I-beam core 1 and is hung with the vertical hook 7 on the left side, forming a relatively large static magnetic gap.

[0080] The lateral displacement of the armature is actually a rotation around the shaft 4. In this embodiment, the shaft 4 is above the armature 3. It can be seen that the shape of the armature hook is different from that of the previous embodiment, but the shape of the vertical hook 7 is the same.

[0081] The center line of the vertical hook of the needle selection device of the present invention and the center line of the I-shaped iron core can be designed to be aligned or deviated by a required distance, thereby meeting the need of stacking two electromagnets up and down.

[0082] In the design of the electromagnet, the rotating shaft can also be set in the middle of the armature, and the hook and magnetic pole parts of the armature are arranged at both ends of the rotating shaft. In this case, the movement directions of the hook and the magnetic pole are opposite. No matter where the rotating shaft is set, as long as it avoids the closed magnetic circuit position, the movement resistance of the rotating shaft will not be affected by the electromagnetic force. At this time, try to keep the magnetic circuit connected so that the magnetic resistance of the magnetic circuit is reduced to obtain a larger electromagnetic force. This is the design core that the present invention should protect.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic circuit structure of a needle selection device, characterized in that: The invention comprises an electromagnet (1), an armature (3), a rotating shaft (4) and a spring (5), wherein the armature (3) is composed of a hook portion (301), a spring force portion (302), a magnetic pole portion (303), a straight rod portion (304), a hole wall portion (305) and an axial hole (306) surrounded by the hole wall portion (305) in sequence, two armatures (3) are located on the left and right sides of the electromagnet (1), one end of the spring (5) is connected to the spring force portion (302) of the armature (3), and the other end of the spring (5) is connected to the electromagnet support (2) of the needle selection device, and the electromagnet (1) is formed by winding a coil around an I-shaped iron core (101), and the front and rear ends of the I-shaped iron core (101) are two crossbeam magnetic poles (102), and the two crossbeam magnetic poles (10 2) forms a closed magnetic circuit after contacting the magnetic pole portion (303) and the straight rod portion (304) of the armature (3), respectively; the rotating shaft (4) is arranged on a needle selection device substrate (9) located outside the closed magnetic circuit; the axial hole (306) of the armature (3) is installed on the rotating shaft (4); the hole wall portion (305) does not participate in the magnetic conduction path of the closed magnetic circuit; and when the armature (3) rotates around the rotating shaft (4), regardless of whether the magnetic pole portion (303) of the armature (3) and one crossbeam magnetic pole (102) of the I-beam core (101) are in an open magnetic gap state or a closed magnetic circuit state, the straight rod portion (304) of the armature (3) and the other crossbeam magnetic pole (102) of the I-beam core (101) always maintain a low magnetic resistance magnetic circuit connection.

2. The magnetic circuit structure of the needle selection device according to claim 1, characterized in that: A magnetically conductive elastic member (6) is installed between the straight rod portion (304) of the armature (3) and another crossbeam magnetic pole (102) of the I-shaped iron core (101) to maintain a magnetic circuit connection with low magnetic resistance between the two.

3. The magnetic circuit structure of the needle selection device according to claim 2, characterized in that: The magnetic conductive elastic member (6) is a square member, an O-shaped member, a U-shaped member, a V-shaped member made of a magnetic conductive plastic sheet, or an elastic member made of a Permalloy material, or an elastic block member made of a magnetic conductive sponge plastic.

4. The magnetic circuit structure of the needle selection device according to claim 1, characterized in that: When the armature (3) rotates around the rotating shaft (4), no matter whether the magnetic pole portion (303) of the armature (3) and one crossbeam magnetic pole (102) of the I-beam core (101) are in an open magnetic gap state or a closed magnetic circuit state, a side surface of the straight rod portion (304) of the armature (3) and a side surface of another crossbeam magnetic pole (102) of the I-beam core (101) always maintain sliding contact, so as to maintain a low magnetic resistance magnetic circuit connection between the two.

5. The magnetic circuit structure of the needle selection device according to claim 4, characterized in that: The two cross-beam magnetic poles (102) of the I-shaped iron core (101) are arranged in a front-to-back offset form, and the offset amplitude of the two cross-beam magnetic poles (102) is equal to the thickness of the straight rod portion (304) of the armature (3); one side surface of the magnetic pole portion (303) of the armature (3) is aligned with the side surface of one cross-beam magnetic pole (102) of the I-shaped iron core (101), and the straight rod portion (304) of the armature (3) is located at the other cross-beam magnetic pole (102) of the I-shaped iron core (101). 102); when the armature (3) rotates around the rotating shaft (4), a side surface of the straight rod portion (304) of the armature (3) and the surface of another crossbeam magnetic pole (102) of the I-beam core (101) are slidingly displaced and always maintain close contact; when in a closed magnetic circuit state, a side surface of the magnetic pole portion (303) of the armature (3) and the side surface of a crossbeam magnetic pole (102) of the I-beam core (101) maintain close contact.

6. The magnetic circuit structure of the needle selection device according to claim 5, characterized in that: The two cross-beam magnetic poles (102) of the I-shaped iron core (101) are provided with torsional bends in opposite front-to-back directions, wherein the outer side surface of the torsional bend of one of the cross-beam magnetic poles (102) serves as the magnetic pole surface of the armature magnetic pole portion, and the upper surface of the torsional bend of the other cross-beam magnetic pole (102) serves as the sliding magnetic pole surface of the armature straight rod portion, and the misalignment amplitude of the torsional bends of the two cross-beam magnetic poles (102) is equal to the thickness of the straight rod portion (304) of the armature (3); the straight rod portion (304) of the armature (3) is located On the sliding magnetic pole surface of the armature straight rod portion, one side surface of the magnetic pole portion (303) of the armature (3) is aligned with the attracting magnetic pole surface of the armature magnetic pole portion; when the armature (3) rotates around the rotating shaft (4), one side surface of the straight rod portion (304) of the armature (3) is slidingly displaced with the sliding magnetic pole surface of the armature straight rod portion and always maintains close contact with it; when in a closed magnetic circuit state, one side surface of the magnetic pole portion (303) of the armature (3) is in close contact with the attracting magnetic pole surface of the armature magnetic pole portion.

7. The magnetic circuit structure of the needle selection device according to claim 5, characterized in that: One of the cross-beam magnetic poles (102) of the I-shaped iron core (101) is provided with a torsion bend, and its upper surface serves as a sliding magnetic pole surface of the armature straight rod portion; the other cross-beam magnetic pole (102) of the I-shaped iron core (101) remains straight, and its outer surface serves as an attracting magnetic pole surface of the armature magnetic pole portion; the cross-beam magnetic pole (102) with the torsion bend and the cross-beam magnetic pole (102) that remains straight are misaligned in the front-to-back direction, and the misalignment amplitude is equal to the thickness of the straight rod portion (304) of the armature (3); the straight rod portion (304) of the armature (3) 04) is located on the sliding magnetic pole surface of the armature straight rod portion, and one side surface of the magnetic pole portion (303) of the armature (3) is aligned with the attraction magnetic pole surface of the armature magnetic pole portion; when the armature (3) rotates around the rotating shaft (4), one side surface of the straight rod portion (304) of the armature (3) and the sliding magnetic pole surface of the armature straight rod portion are slidingly displaced and always maintain close contact with each other. When in a closed magnetic circuit state, one side surface of the magnetic pole portion (303) of the armature (3) maintains close contact with the attraction magnetic pole surface of the armature magnetic pole portion.

8. The magnetic circuit structure of the needle selection device according to claim 6 or 7, characterized in that: Magnetic plastic upper covers (103) are respectively arranged at the twisted bends at both ends of the cross-beam magnetic pole (102) close to the hole wall portion (305), and a groove for facilitating the insertion of the straight rod portion (304) is formed between the magnetic plastic upper cover (103) and the cross-beam magnetic pole (102), and a magnetic elastic member (6) for contacting the straight rod portion (304) is arranged in the groove.

9. The magnetic circuit structure of the needle selection device according to claim 1, characterized in that: In the armature (3), the hook portion (301) and the spring force portion (302) are located at one end of the straight rod portion (304), and the hook portion (301) and the spring force portion (302) are respectively located on the left and right sides of the straight rod portion (304), a section of the straight rod portion (304) close to the hook portion (301) serves as the magnetic pole portion (303), the hole wall portion (305) is located at the other end of the straight rod portion (304), and the axial hole (306) is concentric with the hole wall portion (305).

10. A needle selection device, characterized in that: The needle selection device is equipped with a magnetic circuit structure of the needle selection device as described in any one of claims 1-9.

Images