A magnetic circuit structure of a needle selection device and a needle selection device equipped with the same

Abstract

The application discloses an electromagnet of a needle selecting device and a needle selecting device equipped with the electromagnet, which comprises an electromagnet, an armature, a rotating shaft and a spring. The armature is composed of a hook part, a spring force part, a magnetic pole part, a straight rod part, a hole wall part and a shaft hole. The armature is located on both sides of the electromagnet. The spring is arranged between the spring force part of the armature and a bracket of the electromagnet. The electromagnet is formed by winding a coil on an I-shaped core. The two beam magnetic poles of the I-shaped core and the magnetic pole part and the straight rod part of the armature form a closed magnetic circuit. The rotating shaft is arranged outside the closed magnetic circuit. The shaft hole of the armature is installed on the rotating shaft. The hole wall part does not participate in the magnetic flux path of the closed magnetic circuit. The straight rod part of the armature and one beam magnetic pole of the I-shaped core are always connected in a low magnetic resistance magnetic path. The application eliminates the large magnetic resistance caused by the "rotating shaft magnetic gap", improves the efficiency of the electromagnet, and improves the rotating flexibility without the rotating shaft having to bear the heavy task of controlling the precision of the magnetic gap. The length of the armature is shortened, the weight is reduced, the overall structure of the needle selecting device is compact, and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of electronic jacquard machines in textile machinery, specifically relating to a magnetic circuit structure for a needle selection device and a needle selection device equipped with this magnetic circuit structure. Background Technology

[0002] In recent years, electronic jacquard machines have made significant progress. A key component of an electronic jacquard machine is the needle selector (also called a solenoid valve, electromagnet, or assembly). The needle selector is the actuating component of the machine. It contains an electromagnet; whether the electromagnet coil is energized corresponds to the presence or absence of electromagnetic force. This electromagnetic force is then converted into the raising and lowering of the warp yarns through a mechanism. Therefore, the electromagnet is the crucial component in the needle selector that enables the electromechanical conversion.

[0003] The electromagnet of the needle selection device includes an iron core, coil, armature, shaft, and spring. The armature has a hook, a magnetic pole, a straight rod, and a curved hole wall, which forms a shaft hole. The shaft hole can fit onto the shaft, allowing it to rotate around the shaft. The iron core and armature are made of materials with high permeability and low remanence, forming the magnetic circuit of the electromagnet.

[0004] The working principle of the needle selection device and its electromagnet is a well-known technology. Similar to the principle of an electromagnetic relay, it is a monostable device: when the coil is not energized, there is no electromagnetic force and it does not attract the armature. Under the action of the return spring, the armature magnetic pole moves away from the iron core magnetic pole and is in position 1 (stable position); when the coil is energized, it generates electromagnetic force, attracts the armature, and the armature magnetic pole attracts the iron core magnetic pole, and the armature is in position 2 (temporarily stable position).

[0005] In the needle selection device, the armature is made into a hook shape, called the armature hook. There is also a vertical hook that moves up and down with the jacquard loom's lifting cutter. When the vertical hook disengages from the armature hook, it is called the "disengaged" state, and the vertical hook moves with the lifting cutter. When the vertical hook hooks onto the armature hook, it is called the "hooked" state, and the vertical hook is detached from the lifting cutter and does not move with it. Typically, position 1 (steady-state position) is the "hooked" state, and position 2 (temporarily stable position) is the "disengaged" state, or vice versa. Since the vertical hook connects the guide yarn and heddle yarn 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 needle selector differs from an electromagnetic relay in that the armature in an electromagnetic relay is not subjected to force, while the armature / armature hook in a needle selector is the force-bearing component. When the vertical hook engages the armature hook (in the "hook" state), the force of the connecting wire and its spring connected to the vertical hook is entirely applied to the armature hook and then transmitted to the rotating shaft. For a certain needle selector, the design specification for this force is 1 kg; for other applications, this design specification may be higher. This limitation restricts the design of the electromagnet in the needle selector from the commonly used lightweight design of electromagnetic relays.

[0007] The existing electromagnet design uses an I-beam core, with the extended crossbeams forming two magnetic poles, which, together with the linear armature, create a closed magnetic circuit. The armature has a hole in the center to fit onto a rotating shaft. The center of the shaft is located at the outer edge of one of the magnetic poles. Thus, the curved hole in the armature forms the necessary path in the electromagnet's magnetic circuit. To allow the armature to rotate freely around the shaft, a gap is left between the curved hole and the magnetic poles of the core, called the "shaft magnetic gap." Air has extremely low permeability, so even a small gap will produce magnetic reluctance. The advantage of the "shaft magnetic gap" design is that when the armature rotates around the shaft at a small angle, the distance between the curved hole and the magnetic poles remains constant, thus the gap and magnetic reluctance remain unchanged.

[0008] China has invented a yarn selection device, a double-shed weaving system, and a loom equipped with this system, patent number 98116491.9. The electromagnet component of its yarn selection device uses the aforementioned "rotating shaft magnetic gap" scheme. The disadvantage of this scheme is:

[0009] 1. The magnetic gap of the rotating shaft is a designed gap. To ensure flexible rotation, the gap cannot be too small; it is a fixed magnetic reluctance in the electromagnet's magnetic circuit. The bore wall is a necessary path in the magnetic circuit, and its cross-section is usually smaller than that of the rod, also forming magnetic reluctance. With other parameters of the electromagnet remaining the same, the presence of these magnetic reluctances affects the electromagnet's efficiency, resulting in a lower electromagnetic force.

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

[0011] 3. The resistance to the armature's movement on the shaft is related to the electromagnetic force. An armature that rotates flexibly when the coil is not energized may become less flexible when the coil is energized because the electromagnetic force exerts additional pressure on the armature hole wall. This becomes a contradictory factor in electromagnet design: increasing the electromagnetic force of the electromagnet also increases the resistance to the armature's movement. Summary of the Invention

[0012] To overcome the shortcomings of the prior art, the present invention provides a magnetic circuit structure for a needle selection device and a needle selection device equipped with this magnetic circuit structure.

[0013] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution:

[0014] A magnetic circuit structure for a needle selection device includes an electromagnet, an armature, a rotating shaft, and a spring. The armature is sequentially composed of a hook portion, a spring-loaded portion, a magnetic pole portion, a straight rod portion, a hole wall portion, and a shaft hole formed by the hole wall portion. Two armatures are located on the left and right sides of the electromagnet. One end of the spring is connected to the spring-loaded portion of the armature, and the other end of the spring is connected to the electromagnet support 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 beam magnetic poles, and one of the two beam magnetic poles... The side portion forms a closed magnetic circuit after contacting the magnetic pole portion and the straight rod portion of the armature, respectively. The rotating shaft is set on the needle selection device substrate located outside the closed magnetic circuit. The shaft hole of the armature is installed on the rotating shaft. The hole wall portion does not participate in the magnetic conduction path of the closed magnetic circuit. When the armature rotates around the rotating shaft at a small angle, regardless of whether the magnetic pole portion of the armature and one crossbeam magnetic pole of the I-shaped iron 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-shaped iron core always maintain a low magnetic resistance magnetic circuit connection.

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

[0016] Furthermore, the magnetically conductive elastic element is a square, O-shaped, U-shaped, or V-shaped element made of magnetically conductive plastic sheet, or an elastic element made of permalloy material, or an elastic block made of magnetically conductive sponge plastic.

[0017] Furthermore, when the armature rotates at a small angle around the shaft, regardless of 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 of the straight rod portion of the armature and the side of the other crossbeam magnetic pole of the I-beam core always maintain sliding contact to maintain a low magnetic resistance magnetic circuit connection between them.

[0018] Furthermore, the two crossbeam magnetic poles of the I-beam core are arranged in a staggered manner, and the degree of stagger between the two crossbeam magnetic poles is equal to the thickness of the straight rod portion of the armature; one side of the magnetic pole portion of the armature is aligned with the side of one crossbeam magnetic pole of the I-beam core, while the straight rod portion of the armature is located on one surface of the other crossbeam magnetic pole of the I-beam core; when the armature rotates around the axis of rotation at a certain angle, one side of the straight rod portion of the armature has a sliding displacement with the surface of the other crossbeam magnetic pole of the I-beam core, and always maintains close contact; when in a closed magnetic circuit state, one side of the magnetic pole portion of the armature maintains close contact with the side of one crossbeam 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 directions. The outer surface of the torsional bend of one crossbeam pole serves as the armature pole attraction surface, and the upper surface of the torsional bend of the other crossbeam pole serves as the armature rod sliding surface. The misalignment of the two crossbeam poles is equal to the thickness of the armature rod. The armature rod is located above the armature rod sliding surface, and one side of the armature pole is aligned with the armature pole attraction surface. When the armature rotates around the axis of rotation at a certain angle, one side of the armature rod slides against the armature rod sliding surface, maintaining close contact. When in a closed magnetic circuit state, one side of the armature pole remains in close contact with the armature pole attraction surface.

[0020] Furthermore, one of the crossbeam poles of the I-beam core is provided with a torsional bend, and its surface serves as the sliding pole surface of the armature straight rod portion. The other crossbeam pole of the I-beam core remains straight, and its outer surface serves as the attracting pole surface of the armature pole portion. The torsional bend of the crossbeam pole and the straight crossbeam pole are misaligned in the front-to-back direction, and the misalignment 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 armature straight rod portion, and one side of the armature pole portion is aligned with the attracting pole surface of the armature pole portion. When the armature rotates around the axis of rotation at a certain angle, one side of the armature pole portion and the sliding pole surface of the armature straight rod portion have a sliding displacement and always maintain close contact. When in a closed magnetic circuit state, one side of the armature pole portion and the attracting pole surface of the armature pole portion maintain close contact.

[0021] Furthermore, magnetically conductive plastic covers are respectively provided at the torsional bends of the two ends of the crossbeam magnetic pole near the side of the hole wall. A groove is formed between the magnetically conductive plastic cover and the crossbeam magnetic pole to facilitate the insertion of the straight rod. A magnetically conductive elastic element for contacting the straight rod 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. The section of the straight rod portion near 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 shaft 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 beneficial effects of the present invention are as follows:

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

[0026] 2. The electromagnet of the present invention has fewer factors affecting the magnetic resistance of the circuit, which facilitates 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 resistance to the movement of the rotating shaft is unrelated to the electromagnetic force. Furthermore, the rotating shaft does not have to bear the heavy responsibility of controlling the accuracy of the magnetic gap. Therefore, a more flexible 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 its weight is reduced, making the overall structure of the needle selection device using the electromagnet of the present invention compact.

[0029] 5. In this invention, the armature of the electromagnet contacts the side of the I-beam crossbeam, and under the action of electromagnetic force, the magnetic poles of the armature and the I-beam core can automatically align.

[0030] 6. The center line of the vertical hook of the needle selection device of the present invention can be designed to be aligned with the center line of the I-beam iron core, or it can be designed to be offset from the required distance, which provides a flexible arrangement scheme for designs that require two electromagnets to be stacked one on top of the other.

[0031] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0033] Figure 1 This is a structural diagram of the I-shaped iron core, the square magnetically conductive elastic element, and the armature in the first embodiment of the electromagnet of the present invention when they form a closed magnetic circuit;

[0034] Figure 2 This is a structural diagram of the I-shaped iron core, the O-shaped magnetically conductive elastic element, and the armature in the first embodiment of the electromagnet of the present invention when they form a closed magnetic circuit;

[0035] Figure 3 This is a structural diagram of the I-shaped iron core, the U-shaped magnetically conductive elastic element, and the armature in the first embodiment of the electromagnet of the present invention when they form a closed magnetic circuit;

[0036] Figure 4This is a schematic diagram of the I-beam core structure in a second embodiment of the electromagnet of the present invention;

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

[0038] Figure 6 This is a structural diagram of the I-shaped iron core, the magnetically conductive plastic cover, the magnetically conductive elastic element, and the armature in the third embodiment of the electromagnet of the present invention, when forming a closed magnetic circuit.

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

[0040] Figure 8 This is a structural diagram of the I-shaped iron core, the magnetically conductive plastic cover, the magnetically conductive elastic element, and the armature forming a closed magnetic circuit in the fifth embodiment of the electromagnet of the present invention.

[0041] Figure 9 This is a schematic diagram of the structure of the first embodiment of the needle selection device of the present invention;

[0042] Figure 10 This is a schematic diagram of the structure of a second embodiment of the needle selection device of the present invention. Detailed Implementation

[0043] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The description herein is intended to provide a further understanding of the invention and forms part of this application. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0044] See Figure 1-6As shown, a magnetic circuit structure for a needle selection device includes an electromagnet 1, an armature 3, a rotating shaft 4, and a spring 5. The armature 3 is composed of a hook portion 301, a spring-loaded portion 302, a magnetic pole portion 303, a straight rod portion 304, a hole wall portion 305, and a shaft hole 306 formed by the hole wall portion 305. 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-loaded 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. The electromagnet 1 is formed by winding a coil around an I-shaped iron core 101. The front and rear ends of the I-shaped iron core 101 are two beam magnetic poles 102. One side of the armature 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 disposed on the needle selection device substrate 9 located outside the closed magnetic circuit. The shaft hole 306 of the armature 3 is mounted on the rotating shaft 4. The hole wall portion 305 does not participate in the magnetic conduction path of the closed magnetic circuit. When the armature 3 rotates around the rotating shaft 4 at a small angle, regardless of whether the magnetic pole portion 303 of the armature 3 and one crossbeam magnetic pole 102 of the I-shaped iron 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-shaped iron core 101 always maintain a low magnetic resistance magnetic circuit connection.

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

[0046] Example 1

[0047] See Figure 1 As shown, a magnetically conductive elastic element 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 low magnetic resistance magnetic circuit connection between the two. The magnetically conductive elastic element 6 is a square piece made of magnetically conductive plastic sheet.

[0048] from Figure 1 As can be clearly seen, the shaft 4 is located 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 303 of the armature 3 moving away from the crossbeam magnetic pole 102 above the I-shaped iron core 1, the lower end of the straight rod 304 of the armature 3 also moves away from the crossbeam magnetic pole 102 below the I-shaped iron core 101, resulting in a magnetic gap.

[0049] Therefore, to maintain the magnetic circuit connection, this embodiment employs a magnetically conductive elastic element 6, which is a U-shaped element made of magnetically conductive plastic sheet. This U-shaped element has a certain degree of elasticity, and even when the straight rod portion 304 of the armature 3 leaves the crossbeam magnetic pole 102 below the I-beam core 101, it can still abut its ends against the straight rod portion 304 of the armature 3 and the ends of the crossbeam magnetic pole 102 below the I-beam core 101, thus maintaining the magnetic circuit connection. The magnetically conductive elastic element 6 can also be made of permalloy material or a block-shaped element made of magnetically conductive sponge plastic.

[0050] This solution is applicable when the I-beam core 101 is relatively long. The longer the I-beam core 101 is, the longer the straight rod part 304 of the armature 3 will be. Under the condition that the magnetic gap of the magnetic pole is fixed, the displacement of the crossbeam magnetic pole 102 below the I-beam core 101 that needs to be filled by the magnetically conductive elastic element 6 will be smaller.

[0051] Furthermore, in addition to using a magnetically conductive elastic element 6 to maintain a low magnetic resistance magnetic circuit connection between the straight rod portion 304 of the armature 3 and the other crossbeam magnetic pole 102 of the I-shaped iron core 101, a sliding connection can also be used. That is, when the armature 3 rotates around the rotating shaft 4 at a small angle, regardless of whether the magnetic pole portion 303 of the armature 3 and one crossbeam magnetic pole 102 of the I-shaped iron core 101 are in an open magnetic gap state or a closed magnetic circuit state, one side of the straight rod portion 304 of the armature 3 and the side of the other crossbeam magnetic pole 102 of the I-shaped iron core 101 always maintain sliding contact, thereby maintaining a low magnetic resistance magnetic circuit connection between the two.

[0052] To achieve this side-sliding connection, either a torsional bend in the crossbeam or a torsional bend in the straight armature section can be used. However, considering that the armature and shaft are load-bearing components, in order to maintain good load-bearing characteristics, the following embodiments of the present invention choose a design where the crossbeam poles are torsional bent, while the straight armature section remains straight.

[0053] See Figure 2 As shown, the magnetically conductive elastic element 6 can also be an O-shaped element made of a magnetically conductive plastic sheet. See also Figure 3 As shown, the magnetically conductive elastic element 6 can also be a U-shaped element made of a magnetically conductive plastic sheet. Alternatively, the magnetically conductive elastic element 6 can also be a V-shaped element made of a magnetically conductive plastic sheet.

[0054] In addition to using magnetically conductive plastic sheet material, the magnetically conductive elastic element 6 can also be an elastic element made of permalloy material, or an elastic block made of magnetically conductive sponge plastic.

[0055] Example 2

[0056] See Figure 4-5As shown, the two crossbeam poles 102 of the I-beam core 101 are provided with torsional bends in opposite directions. The outer surface of the torsional bend of one of the crossbeam poles 102 serves as the magnetic pole surface for attracting the armature pole portion, and the upper surface of the torsional bend of the other crossbeam pole 102 serves as the sliding magnetic pole surface for the armature straight rod portion. The misalignment of the torsional bends of the two crossbeam 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... Above the sliding magnetic pole surface of the armature straight rod portion, one side of the magnetic pole portion 303 of the armature 3 is aligned with the 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 of the straight rod portion 304 of the armature 3 has a sliding displacement with the sliding magnetic pole surface of the armature straight rod portion, and always maintains close contact. When in a closed magnetic circuit state, one side of the magnetic pole portion 303 of the armature 3 maintains close contact with the magnetic pole surface of the armature magnetic pole portion.

[0057] from Figure 4 As can be clearly seen, in this embodiment, the two crossbeam magnetic poles 102 of the I-beam core 101 are torsional and misaligned, and are not on the same plane. This utilizes two mutually orthogonal magnetic pole surfaces: the sliding magnetic pole surface of the armature straight rod portion and the attracting magnetic pole surface of the armature magnetic pole portion. From... 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 conduction path of the closed magnetic circuit. This design not only allows the magnetic pole portion 303 of the armature 3 to be aligned with one of the crossbeam magnetic poles 102 of the I-core 101 in terms of height, so that when the magnetic circuit is closed, the magnetic pole portion 303 of the armature 3 can be in close contact with the end face of one of the crossbeam magnetic poles 102 of the I-core 101, but also allows one side of the straight rod portion 304 of the armature 3 to maintain sliding contact with the surface of the other crossbeam magnetic pole 102 of the I-core 101 when the armature 3 rotates around the rotating shaft 4 at a certain angle, thus maintaining a low magnetic resistance magnetic circuit connection.

[0058] Example 3

[0059] See Figure 6 As shown, based on Embodiment 2, a magnetically conductive plastic cover 103 can be provided at the left and right ends of the front side of the crossbeam magnetic pole 102 near the hole wall 305. Both magnetically conductive plastic covers 103 are spaced from the front side of the left and right ends of the torsion bend, thereby forming two grooves on the left and right sides that facilitate the insertion of the straight rod 304. A magnetically conductive elastic element 6 is provided in the groove for contacting the straight rod 304.

[0060] Compared to Example 2, Example 3 adds a magnetically conductive plastic cover, thus upgrading from single-sided magnetic conductivity to double-sided magnetic conductivity. In addition, it is filled with a magnetically conductive elastic element, making it three-sided magnetic conductivity, so the magnetic conductivity effect is better.

[0061] Example 4

[0062] See Figure 7 As shown, one of the crossbeam magnetic poles 102 of the I-beam core 101 is provided with a torsional bend, and its upper surface serves as the sliding magnetic pole surface of the armature straight rod portion. The other crossbeam magnetic pole 102 of the I-beam core 101 remains straight, and its outer surface serves as the attracting magnetic pole surface of the armature magnetic pole portion. The crossbeam magnetic pole 102 with the torsional bend and the crossbeam magnetic pole 102 that remains straight are misaligned in the front-to-back direction, and the misalignment 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 above the sliding magnetic pole surface of the armature straight rod portion, one side of the magnetic pole portion 303 of the armature 3 is aligned with the 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 of the straight rod portion 304 of the armature 3 has a sliding displacement with the sliding magnetic pole surface of the armature straight rod portion, and always maintains close contact. When in a closed magnetic circuit state, one side of the magnetic pole portion 303 of the armature 3 maintains close contact with the magnetic pole surface of the armature magnetic pole portion.

[0063] from Figure 7 As can be clearly seen, in this embodiment, only the crossbeam magnetic pole 102 used for armature attraction in the I-shaped iron core 101 has a torsional bend, while the crossbeam magnetic pole 102 used for armature sliding displacement remains straight and does not twist. Similarly, in this embodiment, the rotating shaft 4 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 also allows the magnetic pole portion 303 of the armature 3 to be aligned with the straight crossbeam magnetic pole 102 of the I-shaped iron core 101 in terms of height, so that when the magnetic circuit is closed, the magnetic pole portion 303 of the armature 3 can be in close contact with the end face of the straight crossbeam magnetic pole 102 of the I-shaped iron core 101. At the same time, when the armature 3 rotates around the rotating shaft 4 at a certain angle, one side of the straight rod portion 304 of the armature 3 can maintain sliding contact with the surface of the torsional bend crossbeam magnetic pole 102 of the I-shaped iron core 101, thus maintaining a low magnetic resistance magnetic circuit connection.

[0064] Example 5

[0065] See Figure 8 As shown, based on embodiment 4, a magnetically conductive plastic cover 103 can be provided at the left and right ends of the front side of the crossbeam magnetic pole 102 near the hole wall 305. Both magnetically conductive plastic covers 103 are spaced from the front side of the left and right ends of the torsion bend, thereby forming two grooves on the left and right sides that facilitate the insertion of the straight rod 304. A magnetically conductive elastic element 6 is provided in the groove for contacting the straight rod 304.

[0066] Compared to Example 4, Example 5 adds a magnetically conductive plastic cover, thus upgrading from single-sided magnetic conductivity to double-sided magnetic conductivity. In addition, it is filled with a magnetically conductive elastic element, making it three-sided magnetic conductivity, so the magnetic conductivity effect is better.

[0067] It should be noted that the above embodiments do not lack magnetic resistance, but rather the contact magnetic resistance of the two magnetic conductor surfaces is much smaller than the magnetic resistance of a rotating shaft where an air gap must be maintained, and it is easier to control quality in mass production. Therefore, these solutions can produce positive effects.

[0068] These embodiments share another common feature: in the armature 3, the hook portion 301 and the spring-loaded portion 302 are located at one end of the straight rod portion 304, and the hook portion 301 and the spring-loaded portion 302 are respectively located on the left and right sides of the straight rod portion 304. The section of the straight rod portion 304 near the hook portion 301 serves as the magnetic pole portion 303, and the hole wall portion 305 is located at the other end of the straight rod portion 304. The shaft hole 306 is concentric with the hole wall portion 305. This design shortens the length of the armature, reduces weight, and makes the overall structure of the needle selection device compact.

[0069] It should also be noted that this invention does not specifically limit which of the two crossbeam magnetic poles 102 of the I-beam core 101 is used for armature magnetic pole attraction and which is used for low magnetic reluctance magnetic circuit connection. For example Figure 1-3 In one embodiment, the shaft 4 is designed to be below the I-beam core 101, and the hook 301 of the armature 3 is above the I-beam core 101. In this case, the force on the shaft 4 is the pressure from the hook 301; while Figure 4-8 In one embodiment, the shaft 4 is designed to be above the I-beam core 101 and the hook 301 of the armature 3 is below the I-beam core 101. In this case, the force on the shaft 4 is the tension of the hook 301.

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

[0071] Example 6

[0072] See Figure 9 As shown, the needle selection device in this embodiment adopts an electromagnet scheme in which the rotating shaft 4 is below the electromagnet 1 and the hook part 301 of the armature 3 is above the electromagnet 1, such as the scheme in Embodiment 1.

[0073] from Figure 9As can be clearly seen, the armature 3 and vertical hook 7 on the right side of the needle selection device are in a "disengaged" state. The armature 3 on the right side is pushed towards the right magnetic pole of the electromagnet 1 by the protrusion 8 on the right vertical hook 7, which is the position of the dynamic magnetic gap a. When the right vertical hook 7 moves downward, it can disengage because the right spring 5 is compressed at this time. As long as the attraction force of the electromagnet 1 on the right armature 3 is greater than the elastic force of the right spring 5, the right armature 3 will remain in this closed magnetic circuit position by electromagnetic force even without the action of the protrusion 8 on the right vertical hook 7 after the right vertical hook 7 moves downward.

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

[0075] The lateral displacement of the armature is actually a rotation about the pivot 4. In this embodiment, the pivot 4 is below the armature 3, and the vertical hook 7 is actually pressed against 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 pressure of the vertical hook. The vertical hook guide rails on both sides of the needle selection device substrate 9 are engaged with the protruding edges on the rod 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 Figure 10 As shown, the needle selection device in this embodiment adopts an electromagnet scheme in which the rotating shaft 4 is above the electromagnet 1 and the hook part 301 of the armature 3 is below the electromagnet 1, such as the schemes in embodiments 2-5.

[0078] from Figure 10 As can be clearly seen, the armature 3 and vertical hook 7 on the right side of the needle selection device are in a "disengaged" state. The armature 3 on the right side is pushed towards the right magnetic pole of the electromagnet 1 by the protrusion 8 on the right vertical hook 7, which is the position of the dynamic magnetic gap a. When the right vertical hook 7 moves downward, it can disengage because the right spring 5 is compressed at this time. As long as the attraction force of the electromagnet 1 on the right armature 3 is greater than the elastic force of the right spring 5, the right armature 3 will remain in this closed magnetic circuit position by electromagnetic force even without the action of the protrusion 8 on the right vertical hook 7 after the right vertical hook 7 moves downward.

[0079] The armature 3 and the vertical hook 7 on the left side of the needle selection device are in a "hook" 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-shaped iron core 1 and hooks with the vertical hook 7 on the left side, forming a fairly large static magnetic gap.

[0080] The lateral displacement of the armature is actually a rotation about the pivot 4. In this embodiment, the pivot 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 can be designed to be aligned with the center line of the I-beam iron core, or it can be designed to be offset from the required distance, so as to meet the needs of stacking two electromagnets on top of each other.

[0082] In electromagnet design, the shaft can also be positioned in the middle of the armature, with the hook and pole portions of the armature aligned at opposite ends of the shaft. In this case, the hook and pole portions move in opposite directions. Regardless of the shaft's location, as long as a closed magnetic circuit is avoided, the shaft's resistance to motion will not be affected by electromagnetic force. Furthermore, maintaining the magnetic circuit connection reduces its magnetic resistance, thereby obtaining a greater electromagnetic force. This is the core design principle that warrants protection in this invention.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A magnetic circuit structure for a needle selection device, characterized in that: The device includes an electromagnet (1), an armature (3), a rotating shaft (4), and a spring (5). The armature (3) is composed of a hook (301), a spring force part (302), a magnetic pole part (303), a straight rod part (304), a hole wall part (305), and a shaft hole (306) formed by the hole wall part (305). The 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 part (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 around an I-shaped iron core (101). The upper and lower ends of the I-shaped iron core (101) are two beam magnetic poles (102). The two beam magnetic poles (102) are connected to the spring force part (303), the spring force part (304), the spring force part (305), the spring force part (306 ...6), the spring force part (304), the spring force part (306), the spring force part (306), the spring force part (306), the spring force part (306), the spring force part (306), the spring force part (306), the spring force part (306), the spring force part ( 2) One side of the armature (3) forms a closed magnetic circuit after contacting the magnetic pole part (303) and the straight rod part (304) of the armature (3) respectively. The rotating shaft (4) is set on the needle selection device substrate (9) located outside the closed magnetic circuit. The shaft hole (306) of the armature (3) is installed on the rotating shaft (4). The hole wall part (305) does not participate in the magnetic conduction path of the closed magnetic circuit. When the armature (3) rotates around the rotating shaft (4), regardless of whether the magnetic pole part (303) of the armature (3) and one beam magnetic pole (102) of the I-shaped iron core (101) are in an open magnetic gap state or a closed magnetic circuit state, the straight rod part (304) of the armature (3) and the other beam magnetic pole (102) of the I-shaped iron 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 element (6) is installed between the straight rod portion (304) of the armature (3) and another crossbeam magnetic pole (102) of the I-core (101) to maintain a low magnetic resistance magnetic circuit connection between the two.

3. The magnetic circuit structure of the needle selection device according to claim 2, characterized in that: The magnetically conductive elastic element (6) is a square, O-shaped, U-shaped, or V-shaped element made of magnetically conductive plastic sheet, or an elastic element made of permalloy material, or an elastic block made of magnetically 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 shaft (4), regardless of whether the magnetic pole part (303) of the armature (3) and one of the crossbeam magnetic poles (102) of the I-core (101) are in an open magnetic gap state or a closed magnetic circuit state, one side of the straight rod part (304) of the armature (3) and the other side of the crossbeam magnetic pole (102) of the I-core (101) always maintain sliding contact 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 crossbeam poles (102) of the I-beam core (101) are arranged in a staggered manner, and the degree of stagger between the two crossbeam poles (102) is equal to the thickness of the straight rod portion (304) of the armature (3); one side of the pole portion (303) of the armature (3) is aligned with the side of one crossbeam pole (102) of the I-beam core (101), and the straight rod portion (304) of the armature (3) is located at the other crossbeam pole of the I-beam core (101). On one surface of 102); when the armature (3) rotates around the pivot (4), one side of the straight rod part (304) of the armature (3) has a sliding displacement with the surface of the other beam magnetic pole (102) of the I-core (101) and always maintains close contact. When in a closed magnetic circuit state, one side of the magnetic pole part (303) of the armature (3) maintains close contact with the side of one beam magnetic pole (102) of the I-core (101).

6. The magnetic circuit structure of the needle selection device according to claim 5, characterized in that: The two crossbeam poles (102) of the I-beam core (101) are provided with torsional bends in opposite directions. The outer surface of the torsional bend of one of the crossbeam poles (102) serves as the magnetic pole surface for attracting the armature pole, and the upper surface of the torsional bend of the other crossbeam pole (102) serves as the sliding magnetic pole surface for the straight rod portion of the armature. The misalignment of the torsional bends of the two crossbeam 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... Above the sliding magnetic pole surface of the armature straight rod portion, one side of the magnetic pole portion (303) of the armature (3) is aligned with the magnetic pole surface of the armature magnetic pole portion; when the armature (3) rotates around the rotating shaft (4), one side of the straight rod portion (304) of the armature (3) has a sliding displacement with the sliding magnetic pole surface of the armature straight rod portion and always maintains close contact; when in a closed magnetic circuit state, one side of the magnetic pole portion (303) of the armature (3) maintains close contact with the 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 crossbeam poles (102) of the I-beam core (101) is provided with a torsional bend, and its upper surface serves as the sliding pole surface of the armature straight rod. The other crossbeam pole (102) of the I-beam core (101) remains straight, and its outer surface serves as the attracting pole surface of the armature pole. The crossbeam pole (102) with the torsional bend and the crossbeam pole (102) that remains straight are misaligned in the front-to-back direction, and the misalignment is equal to the thickness of the straight rod (304) of the armature (3). 04) Located above the sliding magnetic pole surface of the armature straight rod portion, one side of the magnetic pole portion (303) of the armature (3) is aligned with the magnetic pole surface of the armature magnetic pole portion; when the armature (3) rotates around the rotating shaft (4), one side of the straight rod portion (304) of the armature (3) has a sliding displacement with the sliding magnetic pole surface of the armature straight rod portion and always maintains close contact. When in a closed magnetic circuit state, one side of the magnetic pole portion (303) of the armature (3) maintains close contact with the 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: At the two ends of the crossbeam magnetic pole (102) near the hole wall (305), magnetically conductive plastic covers (103) are respectively provided. A groove is formed between the magnetically conductive plastic cover (103) and the crossbeam magnetic pole (102) to facilitate the insertion of the straight rod (304). A magnetically conductive elastic element (6) for contacting the straight rod (304) is provided 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 (301) and the spring force part (302) are located at one end of the straight rod part (304), and the hook (301) and the spring force part (302) are respectively located on the left and right sides of the straight rod part (304). The section of the straight rod part (304) near the hook (301) serves as the magnetic pole part (303), and the hole wall part (305) is located at the other end of the straight rod part (304). The shaft hole (306) is concentric with the hole wall part (305).

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

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