A high-density needle selection device based on a double-pulley groove plate and an assembly thereof

Abstract

The application discloses a high-density needle selection device based on a double-layer pulley set groove plate and an assembly thereof, which comprises a double-layer pulley set groove plate with an upper pulley assembly functional layer and a lower pulley assembly functional layer, the double-layer pulley set groove plate is internally provided with upper and lower stacked pulley sets and two pairs of vertically-hooked rods of the same design corresponding to the pulley sets, and is also provided with upper and lower stacked double electromagnets and two pairs of different design armature hooks corresponding to the double electromagnets; the upper pulley assembly functional layer and the lower pulley assembly functional layer designed in the double-layer pulley set groove plate can accommodate two sets of pulley sets without increasing the thickness of the groove plate; the different armature hook designs of the upper and lower electromagnets enable the front and back surfaces of the partition to adopt the same shape of the vertically-hooked rods; the shaft hole part of the armature hook is rotationally connected with the partition, and the rotating shaft is outside the closed magnetic circuit of the electromagnet, thus not affecting the magnetic circuit and not being affected by the magnetic circuit. The application has compact overall structure, good airtightness, small electromagnet volume and small power consumption, and realizes the accommodation of two sets of double-position compound-action selection devices of the jacquard machine in one unit.

Description

Technical Field

[0001] This invention belongs to the technical field of electronic jacquard machines in textile machinery, specifically relating to a high-density needle selection device and its components based on a double-layer pulley system groove plate. 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 electronic jacquard machine, and its function is to convert electrical signals into the raising and lowering of warp yarns. The working principle of the needle selector is well-known technology, similar to that 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's magnetic poles move away from the iron core's magnetic poles, and it is in position 1 (stable position); when the coil is energized, it generates electromagnetic force, attracting the armature, and the armature's magnetic poles attract the iron core's magnetic poles, placing the armature in position 2 (metastable position).

[0003] 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 detaches 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 warp and heddle wires to control the warp yarns, the rise and fall of the vertical hook corresponds to the rise and fall of the warp yarns.

[0004] Jacquard looms are divided into single-action and double-action types. The double-action type has a more complex mechanism; one jacquard needle corresponds to two vertical hooks, and the two hooks are converted into the movement of one jacquard needle via a pulley system. The double-action type causes less damage to the warp yarns, which is beneficial for weaving. Currently, most electronic jacquard looms are double-action. Mass-produced commercially available needle selection devices often integrate eight electromagnets and their corresponding mechanisms into a single unit for easy installation and maintenance.

[0005] The complex needle selection mechanism, with its numerous components, necessitates a significant space allocation for its implementation. Within the electronic jacquard machine, these needle selection devices are densely arranged in a matrix to form needle boxes, and several needle boxes constitute the entire machine. The volume of the needle selection device directly impacts the overall volume of the electronic jacquard machine, influencing the length of the lifting blade and the design of the mechanism driving its movement. This application proposes a concept of needle density, defined as the number of needles per unit area (the area being the projected area of ​​a surface orthogonal to the needles). Therefore, the needle density of the needle selection device is the ratio of the number of needles to its projected area; similarly, the needle density of the jacquard machine is the ratio of the number of needles to its projected area. Clearly, for the same number of needles, a jacquard machine with higher needle density will have a smaller overall volume.

[0006] Currently, one of the more commonly used needle selection devices on the market has a needle density of 8 needles corresponding to 4×3.5cm. 2 With a needle selection device of approximately 5714 needles per square meter, or 0.57 needles per square centimeter, a jacquard loom with a 5120-needle head would have a projected area of ​​nearly 1 square meter, while a 10,000-needle head would require 2 square meters. Larger needle count heads are mechanically very difficult to manufacture. Such a massive machine also presents significant challenges in its integration with the loom. This is a bottleneck limiting the development of high-needle-count jacquard looms. If a high-density needle selection device were available, for example, doubling the needle density of the selection device, then manufacturing 10,000-needle or even more than 10,000-needle heads would be feasible.

[0007] Chinese invention patent application "Yarn Selection Device, Double Shed Weaving System and Loom Equipped with This Weaving System", patent number 98116491.9 (hereinafter referred to as Prior Patent 1), and European patent application "Three-Position Opening Jacquard Machine", application number: 0723041 (hereinafter referred to as Prior Patent 2), both utilize a scheme of two electromagnets stacked vertically. Prior Patent 2 requires the jacquard machine to have two sets of lifting blades, and suffers from the problems of large electromagnet size and high power consumption, making it less compact. Prior Patent 1, on the other hand, proposes a scheme using two electromagnets to control a "hook pair," where the "hook" corresponds to the "vertical hook" in the needle selection device, and the "hook pair" is a pair of two related hooks. Prior Patent 1's scheme cannot directly generate a three-position opening; it requires the action of a complex pulley system connected to the "hook pair" to generate the three-position opening. Since the "pull hook pair" consists of two pull hooks moving in conjunction with each other, unlike two independent vertical hooks, the solution in prior patent 1 cannot replace two independent vertical hooks to improve the needle lifting density of the two-position needle selection device, nor can it lead to a high-density solution. Summary of the Invention

[0008] To overcome the shortcomings of the existing technology, the present invention provides a high-density needle selection device and its components based on a double-layer pulley system groove plate.

[0009] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution:

[0010] A high-density needle selection device based on a double-layer pulley block groove plate includes a double-layer pulley block groove plate. The front and rear interlayers of the double-layer pulley block groove plate are respectively an upper pulley assembly functional layer and a lower pulley assembly functional layer. The upper pulley block functional layer is divided into the following functional segments from top to bottom: a fully linear upper pulley block vertical hook groove segment, an upper pulley block upper line groove segment, an upper pulley block pulley groove segment, and an upper pulley block lower pulley line groove segment. The lower pulley block functional layer is also divided into the following functional segments from top to bottom: a fully linear lower pulley block vertical hook groove segment, a lower pulley block upper line groove segment, a lower pulley block pulley groove segment, and a lower pulley block lower pulley line groove segment.

[0011] The upper pulley group and the lower pulley group each have a corresponding pair of vertical hooks in their respective vertical hook groove sections; the upper pulley group and the lower pulley group each have a corresponding set of pulleys in their respective pulley groove sections, and the two sets of pulleys are stacked in a staggered manner on the front and rear sides of the double-layer pulley group groove plate; the two pairs of vertical hooks drive their respective sets of pulleys to slide up and down through the upper pulley line;

[0012] The top of the double-layer pulley system slot plate is provided with a partition plate. Two electromagnets are stacked vertically on the partition plate via an electromagnet frame, and each electromagnet has two intersecting magnetic pole surfaces. On the left and right sides of the two electromagnets, there is a pair of armature hooks for cooperating with a pair of vertical hooks on the same side. The two pairs of armature hooks are designed differently and are located inside the pair of vertical hooks on the same side. The shaft holes of the two pairs of armature hooks are rotatably connected to the front and rear sides of the partition plate via a pair of rotating shafts provided on the partition plate. The rear sides of the hook tips of the two pairs of armature hooks are elastically connected to the left and right sides of the electromagnet frame via a pair of springs. The intersecting magnetic pole surfaces of the two electromagnets cooperate with the two sides of their respective pair of armature hooks to form a closed magnetic circuit. The two pairs of rotating shafts are located outside the two closed magnetic circuits, and the hook tips and magnetic poles of the armature hooks are on the same side of the rotating shafts.

[0013] Furthermore, the double-layer pulley block groove plate includes a second substrate, a first substrate, and a second substrate assembled sequentially from front to back, or a first substrate, a second substrate, and a first substrate assembled sequentially from front to back;

[0014] The rear side groove of the second substrate and the front side groove of the first substrate are combined to form the upper pulley assembly functional layer; the rear side groove of the first substrate and the front side groove of the second substrate are combined to form the lower pulley assembly functional layer.

[0015] The upper pulley assembly functional layer and the lower pulley assembly functional layer are arranged overlapping each other with respect to the first or second substrate located in the middle. The vertical hook groove section of the upper pulley group and the vertical hook groove section of the lower pulley group are positioned front-to-back and have the same thickness. The pulley groove section of the upper pulley group is positioned front-to-back with the upper pulley groove section of the lower pulley group. The thickest pulley support section of the upper pulley groove section is located at the center of the double-layer pulley group groove plate, while the upper pulley groove section of the lower pulley group is located on both sides of the double-layer pulley group groove plate. The upper pulley group and the lower pulley groove section of the upper pulley group are positioned front-to-back with the lower pulley groove section of the lower pulley group. The upper pulley group and the lower pulley groove section are located on both sides of the double-layer pulley group groove plate and do not conflict with the pulley group support section of the lower pulley groove section located at the center of the double-layer pulley group groove plate. The upper pulley group and the lower pulley group are staggered and stacked on the front and back sides, and the upper pulley group and the lower pulley group have the same thickness.

[0016] Furthermore, both the first substrate and the second substrate are plastic parts formed by injection molding in one step. Buckles are provided on the front and rear sides of both the first and second substrates. The rear side of the second substrate and the front side of the first substrate are superimposed and joined together by corresponding buckles. Additionally, positioning notches are provided on the lower side end faces of both the first and second substrates to determine whether their assembly is correct. When both the first and second substrates are correctly aligned with their side grooves, the positioning notches on the first substrate and the second substrate fit together horizontally.

[0017] Furthermore, when the second substrate, the first substrate, and the second substrate are assembled, the first substrate in the middle is used as the central substrate. At this time, the partition, the electromagnet skeleton, and the two electromagnets stacked on top of the first substrate are arranged on the top of the two second substrates on both sides, and heat sinks corresponding to the positions of their respective electromagnets are arranged on the top of the second substrates on both sides.

[0018] Furthermore, when the first substrate, the second substrate, and the first substrate are combined, the second substrate in the middle is used as the central substrate. At this time, the partition, the electromagnet skeleton, and the two electromagnets stacked on top of the second substrate are arranged on the top of the second substrate, and the tops of the two first substrates on both sides are respectively provided with heat sinks corresponding to the positions of their respective electromagnets.

[0019] The heat sink is used to dissipate heat from the coil of the electromagnet and also serves as electromagnetic shielding. The heat sink is made of a non-magnetic metal material, and at least one side of the heat sink is exposed and in good contact with the metal body to conduct heat and electricity to the outside.

[0020] Furthermore, the grooves on the front side of the first substrate, from top to bottom, are: the first half of the vertical hook groove of the upper pulley group, the first half of the upper pulley line groove of the upper pulley group, the first half of the pulley groove of the upper pulley group, and the first half of the lower pulley line groove of the upper pulley group; the grooves on the rear side of the second substrate, from top to bottom, are: the second half of the vertical hook groove of the upper pulley group, the second half of the upper pulley line groove of the upper pulley group, the second half of the pulley groove of the upper pulley group, and the second half of the lower pulley line groove of the upper pulley group.

[0021] When the rear side of the second substrate is joined to the front side of the first substrate, the second half of the vertical hook sliding groove of the upper pulley group and the first half of the vertical hook sliding groove of the upper pulley group are joined front to back to form the vertical hook sliding groove section of the upper pulley group. The second half of the upper pulley line groove of the upper pulley group and the first half of the upper pulley line groove of the upper pulley group are joined front to back to form the upper pulley line groove section of the upper pulley group. The second half of the pulley sliding groove of the upper pulley group and the first half of the pulley sliding groove of the upper pulley group are joined front to back to form the pulley sliding groove section of the upper pulley group. The second half of the lower pulley line groove of the upper pulley group and the first half of the lower pulley line groove of the upper pulley group are joined front to back to form the lower pulley line groove section of the upper pulley group.

[0022] Furthermore, the grooves on the rear side of the first substrate, from top to bottom, are: the first half of the vertical hook groove of the lower slide wheel assembly, the first half of the upper pulley line groove of the lower slide wheel assembly, the first half of the pulley groove of the lower slide wheel assembly, and the first half of the lower slide wheel line groove of the lower slide wheel assembly; the grooves on the front side of the second substrate, from top to bottom, are: the second half of the vertical hook groove of the lower slide wheel assembly, the second half of the upper pulley line groove of the lower slide wheel assembly, the second half of the pulley groove of the lower slide wheel assembly, and the second half of the lower slide wheel line groove of the lower slide wheel assembly.

[0023] When the rear side of the first substrate and the front side of the second substrate are joined together, the first half of the sliding groove of the vertical hook of the lower slide wheel assembly and the second half of the sliding groove of the vertical hook of the lower slide wheel assembly are joined together to form the sliding groove segment of the vertical hook of the lower slide wheel assembly. The first half of the groove of the upper pulley line of the lower slide wheel assembly and the second half of the groove of the upper pulley line of the lower slide wheel assembly are joined together to form the groove segment of the upper pulley line of the lower slide wheel assembly. The first half of the sliding groove of the pulley of the lower slide wheel assembly and the second half of the sliding groove of the pulley of the lower slide wheel assembly are joined together to form the sliding groove segment of the pulley of the lower slide wheel assembly. The first half of the groove of the lower slide wheel line of the lower slide wheel assembly and the second half of the groove of the lower slide wheel line of the lower slide wheel assembly are joined together to form the groove segment of the lower slide wheel line of the lower slide wheel assembly.

[0024] Furthermore, the two pairs of vertical hooks are a pair of first vertical hooks and a pair of second vertical hooks with identical structures; the two pulley groups are an upper pulley group and a lower pulley group with identical structures; the two electromagnets stacked vertically are an upper electromagnet and a lower electromagnet with symmetrical structures; the two pairs of armature hooks are an upper armature hook and a lower armature hook with different structures; the two pairs of springs are a pair of first springs and a pair of second springs with identical structures; and the two pairs of rotating shafts are a first rotating shaft and a second rotating shaft with identical structures.

[0025] The specific structure within the functional layer of the upper pulley assembly is as follows: a pair of first vertical hooks are slidably disposed on the left and right sides of the vertical hook groove section of the upper pulley assembly; the upper pulley assembly is slidably disposed on the pulley groove section of the upper pulley assembly; the pair of first vertical hooks are connected to the upper pulley of the upper pulley assembly via a pulley line located in the pulley line groove section of the upper pulley assembly; the lower pulley of the upper pulley assembly is connected to the first head wire connector via a pulley line located in the lower pulley line groove section of the upper pulley assembly; the first vertical hooks move up and down within the vertical hook groove section of the upper pulley assembly as the knife is lifted, causing the upper pulley assembly to move up and down within the pulley groove section of the upper pulley assembly; the upper electromagnet is fixedly installed at the upper end of the electromagnet frame; a pair of upper armature hooks are located on the left and right sides of the upper electromagnet, and the pair of upper armature hooks are located inside the pair of first vertical hooks; the shaft holes of the pair of upper armature hooks are connected via corresponding... A pair of first rotating shafts are rotatably connected to corresponding points on the front side of the partition plate. The rear sides of the hook tips of a pair of upper armature hooks are elastically connected to corresponding points on the left and right sides of the upper part of the electromagnet frame through a pair of first springs. The intersecting magnetic pole surfaces of the upper electromagnets cooperate with the two sides of the pair of upper armature hooks to form corresponding front closed magnetic circuits. Both first rotating shafts are located outside the front closed magnetic circuits, and the hook tips and magnetic poles of the upper armature hooks are on the same side of the first rotating shafts. When the upper electromagnet is energized, the upper armature hooks remain in the front closed magnetic circuit position, and the hook tips of the upper armature hooks do not contact the hook tips of the first vertical hooks, thus being in a disengaged state. When the upper electromagnet is not energized, the upper armature hooks move away from the magnetic poles of the upper electromagnet under the action of the first springs, and the hook tips of the upper armature hooks hook the hook tips of the first vertical hooks in a pulling manner, thus being in a hooked state.

[0026] The specific structure within the functional layer of the sliding wheel assembly is as follows: a pair of second vertical hooks are slidably disposed on the left and right sides of the vertical hook groove section of the sliding wheel assembly; the sliding wheel assembly is slidably disposed within the pulley groove section of the sliding wheel assembly; the pair of second vertical hooks are connected to the upper pulley of the sliding wheel assembly via a pulley line located within the upper pulley line groove section of the sliding wheel assembly; the lower pulley of the sliding wheel assembly is connected to the second head wire connector via a pulley line located within the lower pulley line groove section of the sliding wheel assembly; the second vertical hooks, within the vertical hook groove section of the sliding wheel assembly, move the sliding wheel assembly up and down within the pulley groove section of the sliding wheel assembly as the knife is lifted; the lower electromagnet is fixedly installed at the lower end of the electromagnet frame; a pair of lower armature hooks are located on the left and right sides of the lower electromagnet, and the pair of lower armature hooks are located inside the pair of second vertical hooks; the shaft holes of the pair of lower armature hooks are connected via corresponding... A pair of second rotating shafts are rotatably connected to corresponding points on the rear side of the partition plate. The rear sides of the hook tips of a pair of lower armature hooks are elastically connected to corresponding points on the left and right sides of the lower part of the electromagnet frame through a pair of second springs. The intersecting magnetic pole surfaces of the lower electromagnet cooperate with the two sides of the pair of lower armature hooks to form corresponding closed magnetic circuits on the back side. Both second rotating shafts are located outside the closed magnetic circuits on the back side, and the hook tips and magnetic poles of the lower armature hooks are on the same side of the second rotating shafts. When the lower electromagnet is energized, the lower armature hooks remain in the closed magnetic circuit position on the back side, and the hook tips of the lower armature hooks do not contact the hook tips of the second vertical hooks, thus being in a disengaged state. When the lower electromagnet is not energized, the lower armature hooks move away from the magnetic poles of the lower electromagnet under the action of the second springs, and the hook tips of the lower armature hooks hook the hook tips of the second vertical hooks in a lifting manner, thus being in a hooked state.

[0027] Furthermore, the vertical hook includes a rod-shaped body. A side ear for engaging with the blade edge is provided at the middle of the outer side of the rod-shaped body. A top hook is provided at the top of the inner side of the rod-shaped body, with the hook tip close to the inner edge of the rod-shaped body and the hook base close to the axis of the rod-shaped body. A protruding edge is provided at the upper edge of the inner side of the rod-shaped body, below the top hook, for laterally pushing and holding the corresponding armature hook. This protruding edge laterally protrudes beyond the hook tip of the top hook. The contour curve of the protruding edge is divided into a pushing section in the upper part and a holding section in the lower part. The pushing section is an inclined curve starting from the hook base of the top hook. The retaining section is a straight line parallel to the moving direction of the rod-shaped body, and the pushing section is smoothly connected to the retaining section; the distance from the bottom of the retaining section to the bottom of the top hook is greater than the distance from the tip of the top hook to the bottom of the top hook; the length of the retaining section of the convex edge corresponds to the tolerance range of the jacquard machine knife lifting height allowed by its needle selection device; the middle and lower parts of the inner side of the rod-shaped body are provided with a limiting convex edge along its edge for fitting with the vertical hook guide rail and ensuring that the vertical hook does not have lateral displacement, and the top end of the limiting convex edge is connected to the bottom end of the retaining section of the convex edge in a straight line parallel to it; at least one damping groove is provided between the side ear and the rod-shaped body to block the vibration of the knife lifting.

[0028] Furthermore, the armature hook includes a straight rod portion, a magnetic pole surface sliding contact portion, a magnetic pole surface attracting contact portion, a shaft hole portion, a hook tip portion, and a spring positioning post. The cross-section of the straight rod portion is rectangular. The shaft hole portion is disposed at one end of the straight rod portion through the magnetic pole surface sliding contact portion. The hook tip portion is disposed at the other end of the straight rod portion through the magnetic pole surface attracting contact portion. The spring positioning post is disposed on the side wall of the straight rod portion facing the electromagnet.

[0029] The electromagnet is formed by winding enameled wire around an I-shaped iron core. One end of the I-shaped iron core is a long magnetic pole, and the other end is a short magnetic pole. The long magnetic pole has a first bend that curves backward at both ends, and the short magnetic pole has a second bend that curves forward at both ends. The first bend and the second bend are offset from each other, and the offset is equal to the thickness of the straight rod. The concave surface of the first bend serves as a sliding magnetic pole surface, and the side surface of the second bend serves as an attracting magnetic pole surface. The sliding magnetic pole surface and the attracting magnetic pole surface on the same side form two intersecting magnetic pole surfaces. A magnetically conductive plastic cover is provided in front of the sliding magnetic pole surface. There is a gap between the magnetically conductive plastic cover and the sliding magnetic pole surface to form a groove for the straight rod to be inserted. A magnetically conductive elastic element for contacting the straight rod is provided in the groove.

[0030] After assembly, the shaft hole is rotatably mounted on the rotating shaft, one end of the spring is fixed to the spring positioning post, and the other end of the spring is fixedly connected to a corresponding point on the side wall of the electromagnet frame; the magnetic pole surface sliding contact is tightly embedded in the groove formed by the sliding magnetic pole surface, the magnetically conductive plastic cover, and the magnetically conductive elastic element, and the magnetic pole surface attraction contact is laterally aligned with the attraction magnetic pole surface; when the magnetic pole surface attraction contact is in contact with the attraction magnetic pole surface, three sides of the magnetic pole surface sliding contact are in contact with the sliding magnetic pole surface, the magnetically conductive plastic cover, and the magnetically conductive elastic element, respectively, so that the sliding magnetic pole surface, the magnetic pole surface sliding contact, the straight rod, the magnetic pole surface attraction contact, and the attraction magnetic pole surface constitute the closed magnetic circuit; the shaft hole is located outside the closed magnetic circuit and does not participate in the magnetic conduction path of the closed magnetic circuit; the mating points of the two pairs of armature hooks and their respective corresponding pairs of vertical hooks are at the same position and height.

[0031] Furthermore, the pulley assembly includes two mounting plates, two pulleys, two ball bearings, two pulley shafts, a bracket pressing protrusion, and a bracket pressing hole; the two pulleys are respectively mounted at the upper and lower ends of the pulley bracket formed by the two mounting plates through their respective sets of ball bearings and pulley shafts; the width of both mounting plates is smaller than the diameter of the pulleys; the thickness of the two mounting plates is equal, serving as positioning sliders when the pulley assembly moves within the pulley groove section of the upper pulley assembly or the pulley groove section of the lower pulley assembly.

[0032] Furthermore, a printed circuit board slot is provided at the top of the electromagnet frame, and metal springs for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot. Coil lead grooves, first spring mounting holes and second spring mounting holes are provided on both the left and right sides of the electromagnet frame.

[0033] A high-density needle selection device assembly is a 16-needle high-density needle selection device assembly formed by stacking eight of the above-mentioned high-density needle selection devices based on a double-layer pulley system.

[0034] It should be noted that the technical solution of the present invention is not limited to the manufacture of a 16-needle high-density needle selection device assembly, but can also be used to manufacture a needle selection device assembly with even higher density.

[0035] The present invention also discloses an electronic jacquard machine equipped with a high-density needle selection device assembly as described above.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] This invention optimizes and improves the pulley block groove plate, enabling the installation of two sets of stacked pulley assemblies within the double pulley block groove plate while maintaining the existing pulley block thickness, thus increasing the installation density of the pulley assemblies. Furthermore, compared to existing open-type jacquard machine pulley blocks, the double pulley block groove plate of this invention has a compact structure, good sealing performance, minimizes the impact of lint and dust on the pulley assemblies, has a longer service life, and is easy to install and maintain, making it suitable for mass production.

[0038] This invention optimizes and improves hook release technology by employing a fully linear vertical hook guide rail and a vertical hook convex edge design to create a new hook release technology. This technology allows for the design of larger hooks without concerns about difficulty in releasing them, and the ample design margin ensures operational reliability under complex working conditions. The cooperation between the fully linear vertical hook guide rail and the vertical hook convex edge ensures the accuracy of the lateral displacement of the convex edge relative to the armature hook during vertical hook movement, enabling a dynamic magnetic gap range of 0–0.3 mm. Furthermore, the distance from the holding section of the vertical hook convex edge to the hook bottom is greater than the distance from the hook tip to the hook bottom; this distance difference is also the distance from the armature hook tip to the vertical hook tip, thus providing a release margin, which is a tolerance margin that prevents malfunctions and improves reliability. The holding section of the convex edge allows the knife to reach the vertical hook switching height (from hooking to releasing) required by the needle selection device within a wide range, providing a wide range of knife lifting height tolerance (tolerance margin), reducing the manufacturing difficulty of the jacquard machine main unit and improving the overall machine's operational reliability. The vertical hook has one or more shock-absorbing grooves between the side ear and the rod to prevent the vibration of lifting the knife from being transmitted to the hook tip through the side ear, which can also improve the reliability of the action.

[0039] This invention optimizes and improves the magnetic circuit structure. The electromagnet of this invention eliminates the large magnetic reluctance caused by the "shaft magnetic gap" in existing technologies, thus improving electromagnet efficiency. The electromagnet of this invention has fewer factors affecting the circuit magnetic reluctance, facilitating quality control in mass production. The shaft of the electromagnet of this invention is not on a closed magnetic circuit; the shaft's movement resistance is independent of the electromagnetic force, and the shaft does not bear the heavy responsibility of controlling the magnetic gap accuracy, allowing for a more flexible design and improved shaft flexibility. The armature hook of the electromagnet of this invention is shorter and lighter, resulting in a more compact overall structure for the needle selection device using this electromagnet. The armature of the electromagnet of this invention contacts the side of the I-beam core beam, and under the action of electromagnetic force, the armature and the magnetic poles of the I-beam core can automatically align. The electromagnet coil of this invention has low power consumption, reducing the load on the drive circuit. Furthermore, the coil temperature is low, reducing mechanical deformation of the needle selection device components due to temperature rise. It also improves the tolerance margin to power supply voltage and ambient temperature, enhancing the reliability of operation and control.

[0040] The high-density needle selection device of this invention has a compact overall structure, a rationally designed magnetic circuit, a small electromagnet size, low power consumption, and reliable operation. Furthermore, it employs two independent vertical hooks to enhance the needle lifting density of the two-position needle selection device, thus enabling the integration of two sets of needle selection devices for dual-position compound jacquard machines into a single unit. Using this high-density needle selection device, a 16-needle selection device assembly can be implemented, corresponding to a 4×3.5cm... 2 The needle density is as high as 11,428 needles per square meter, which is twice that of commonly used needle selection device components on the market. Therefore, the high-density needle selection device of this invention is expected to be used to manufacture electronic jacquard machines with 20,000 needles or even more needles per machine.

[0041] 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

[0042] 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:

[0043] Figure 1 This is an exploded view of one embodiment of the high-density needle selection device of the present invention;

[0044] Figure 2 This is an exploded view of another embodiment of the high-density needle selection device of the present invention;

[0045] Figure 3 The diagram shows the two side groove structures of the first substrate of the high-density needle selection device of the present invention, wherein the left diagram is a schematic diagram of the front side groove structure and the right diagram is a schematic diagram of the rear side groove structure.

[0046] Figure 4 The diagram shows the groove structure on two sides of the first substrate of the high-density needle selection device of the present invention, wherein the left diagram is a schematic diagram of the groove structure on the rear side and the right diagram is a schematic diagram of the groove structure on the front side.

[0047] Figure 5 This is a schematic diagram of the structure of the front of the diaphragm and the vertical hook slide section of the upper pulley group in the high-density needle selection device of the present invention;

[0048] Figure 6 This is a schematic diagram of the structure of the back of the partition plate and the vertical hook slide section of the lower roller assembly in the high-density needle selection device of the present invention;

[0049] Figure 7 This is a structural diagram of a vertical hook embodiment in the high-density needle selection device of the present invention;

[0050] Figure 8 This is a structural diagram of another vertical hook embodiment in the high-density needle selection device of the present invention;

[0051] Figure 9 This is a schematic diagram of the structure of the I-beam core and armature hook of the high-density needle selection device of the present invention when they form a closed magnetic circuit;

[0052] Figure 10 This is a perspective view of the pulley system in the high-density needle selection device of the present invention;

[0053] Figure 11 This is an exploded view of the pulley system in the high-density needle selection device of the present invention;

[0054] Figure 12 This is a schematic diagram of the structure of the high-density needle selection device of the present invention after the dual electromagnets and the electromagnet frame are assembled.

[0055] Figure 13 This is an exploded view of an embodiment of the A-type multilayer slot plate assembly of the high-density needle selection device of the present invention;

[0056] Figure 14 This is an exploded view of an embodiment of the type B double-layer slot plate assembly of the high-density needle selection device of the present invention;

[0057] Figure 15 This is a schematic diagram of the high-density needle selection device assembly of the present invention;

[0058] Figure 16 This is a schematic diagram of the substrate for Staubli's M4 / M5 modules. Detailed Implementation

[0059] 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.

[0060] See Figure 1 and Figure 2 As shown, a high-density needle selection device based on a double-layer pulley system includes a double-layer pulley system. The double-layer pulley system can be assembled from front to back in the order of second substrate 10, first substrate 9, and second substrate 10, or it can be assembled from front to back in the order of first substrate 9, second substrate 10, and first substrate 9.

[0061] See Figure 3As shown, the grooves on the front side of the first substrate 9, from top to bottom, are: the first half-side sliding groove 901 for the vertical hook of the upper pulley group, the first half-side groove 902 for the upper pulley line of the upper pulley group, the first half-side sliding groove 903 for the pulley of the upper pulley group, and the first half-side groove 904 for the lower pulley line of the upper pulley group. The grooves on the rear side of the first substrate 9, from top to bottom, are: the first half-side sliding groove 905 for the vertical hook of the lower pulley group, the first half-side groove 906 for the upper pulley line of the lower pulley group, the first half-side sliding groove 907 for the pulley of the lower pulley group, and the first half-side groove 908 for the lower pulley line of the lower pulley group.

[0062] See Figure 4 As shown, the grooves on the rear side of the second substrate 10, from top to bottom, are: the second half-side sliding groove 1001 for the vertical hook of the upper pulley group, the second half-side groove 1002 for the upper pulley line of the upper pulley group, the second half-side sliding groove 1003 for the pulley of the upper pulley group, and the second half-side groove 1004 for the lower pulley line of the upper pulley group. The grooves on the front side of the second substrate 10, from top to bottom, are: the second half-side sliding groove 1005 for the vertical hook of the lower pulley group, the second half-side groove 1006 for the upper pulley line of the lower pulley group, the second half-side sliding groove 1007 for the pulley of the lower pulley group, and the second half-side groove 1008 for the lower pulley line of the lower pulley group.

[0063] See Figure 3 and Figure 4 As shown, both the first substrate 9 and the second substrate 10 are plastic parts formed by one-time injection molding. The first substrate 9 and the second substrate 10 are respectively provided with snap-fit ​​fasteners on their front and back sides. The rear side of the second substrate 10 and the front side of the first substrate 9 are overlapped and joined together by the corresponding snap-fit ​​fasteners.

[0064] See Figure 3 and Figure 4 As shown, the lower side end face of the first substrate 9 and the lower side end face of the second substrate 10 are respectively provided with positioning notches 20 for judging whether the two are correctly assembled. When the first substrate 9 and the second substrate 10 are both assembled with the correct side groove shape facing each other, the positioning notch 20 on the first substrate 9 and the positioning notch 20 on the second substrate 10 are in close contact.

[0065] See Figure 1As shown, when the rear side groove of the second substrate 10 is combined with the front side groove of the first substrate 9, one layer of the double-layer pulley group groove plate is formed, namely the upper pulley assembly functional layer. The upper pulley assembly functional layer is divided into four functional segments from top to bottom: a fully linear upper pulley group vertical hook groove segment, an upper pulley group upper pulley line groove segment, an upper pulley group pulley groove segment, and an upper pulley group lower pulley line groove segment. These four functional segments are respectively formed by the corresponding assembly of the upper pulley group vertical hook second half side sliding groove 1001, upper pulley line second half side groove 1002, upper pulley pulley second half side sliding groove 1003, upper pulley group lower pulley line second half side groove 1004 on the rear side of the second substrate 10 and the upper pulley group vertical hook first half side sliding groove 901, upper pulley line first half side groove 902, upper pulley pulley first half side sliding groove 903, upper pulley group lower pulley line first half side groove 904 on the front side of the first substrate 9.

[0066] See Figure 2 As shown, when the rear side groove of the first substrate 9 and the front side groove of the second substrate 10 are combined, another layer of space in the double-layer pulley group groove plate is formed, namely the lower pulley assembly functional layer. The lower pulley group functional layer is divided into four functional segments from top to bottom: a fully linear lower pulley group vertical hook groove segment, an upper pulley line groove segment, a lower pulley group pulley groove segment, and a lower pulley line groove segment. These four functional segments are respectively formed by the corresponding assembly of the following components on the rear side of the first substrate 9: the first half of the vertical hook sliding groove 905 of the sliding wheel assembly, the first half of the upper pulley line groove 906 of the sliding wheel assembly, the first half of the pulley sliding groove 907 of the sliding wheel assembly, and the first half of the lower pulley line groove 908 of the sliding wheel assembly, and the second half of the vertical hook sliding groove 1005 of the sliding wheel assembly, the second half of the upper pulley line groove 1006 of the sliding wheel assembly, the second half of the pulley sliding groove 1007 of the sliding wheel assembly, and the second half of the lower pulley line groove 1008 of the sliding wheel assembly.

[0067] The upper pulley assembly functional layer and the lower pulley assembly functional layer are arranged overlapping each other inside the double-layer pulley system groove plate. The vertical hook groove section of the upper pulley system corresponds to the vertical hook groove section of the lower pulley system and has the same thickness. The pulley groove section of the upper pulley system corresponds to the upper pulley groove section of the lower pulley system, and the thickest pulley support section of the upper pulley groove section is located at the center of the double-layer pulley system groove plate, while the upper pulley groove section of the lower pulley system is located on both sides of the double-layer pulley system groove plate, and can be nested without spatial conflict. The lower pulley groove section of the upper pulley system corresponds to the lower pulley groove section of the lower pulley system, and the upper pulley groove section of the lower pulley system is located on both sides of the double-layer pulley system groove plate, and does not conflict with the pulley support section of the lower pulley groove section located at the center of the double-layer pulley system groove plate. The upper pulley group pulley groove section and the lower pulley group pulley groove section are designed to be stacked vertically and offset on the front and rear sides, and the upper pulley group pulley groove section and the lower pulley group pulley groove section have the same thickness, providing space for the subsequent vertically and offset installation of the upper pulley group and the lower pulley group.

[0068] In order to accommodate two needle selection units in a single slot plate without increasing the width and thickness of the slot plate, this invention requires the design of two substrates with different double-sided slot shapes. This enables the realization of a double-layer structure within the slot plate, allowing the combination of two needle selection units to occupy the same width (35mm) and thickness (5mm) as the original needle selection unit.

[0069] See Figure 1 As shown, when the second substrate 10, the first substrate 9, and the second substrate 10 are assembled, the first substrate 9 in the middle is used as the center piece, and the second substrate 10 on the front and back sides is used as the side plate.

[0070] See Figure 2 As shown, when the first substrate 9, the second substrate 10, and the first substrate 9 are assembled, the second substrate 10 in the middle is used as the center piece, and the first substrate 9 on the front and back sides is used as the side plate.

[0071] See Figure 1 and Figure 2As shown, a partition 1 is provided on the top of either the first substrate 9 or the second substrate 10 located in the middle. Two electromagnets, stacked vertically, are mounted on the partition 1 via an electromagnet frame 2, and each electromagnet has two intersecting magnetic pole surfaces. A pair of armature hooks are provided on the left and right sides of each of the two electromagnets to engage with a pair of vertical hooks on the same side. The two pairs of armature hooks have different designs and are located inside the pair of vertical hooks on the same side. The shaft holes of the two pairs of armature hooks are rotatably connected to the front and rear surfaces of the partition 1 via a pair of rotating shafts mounted on the partition 1. The rear sides of the hook tips of the two pairs of armature hooks are elastically connected to the left and right sides of the electromagnet frame 2 via a pair of springs. The intersecting magnetic pole surfaces of the two electromagnets engage with the two sides of their respective pair of armature hooks to form closed magnetic circuits. The two pairs of rotating shafts are located outside the two closed magnetic circuits, and the hook tips and magnetic poles of the armature hooks are on the same side of the rotating shafts. The tops of the two second substrates 10 on both sides or the two first substrates 9 on both sides are respectively provided with heat sinks 15 corresponding to the positions of the respective electromagnets. The heat sinks 15 are used to dissipate heat from the coils of the electromagnets and also serve as electromagnetic shielding. The heat sinks 15 are made of non-magnetic metal material, and at least one side of the heat sink 15 is exposed and in good contact with the metal body to conduct heat and electricity to the outside.

[0072] The electromagnet coil in the needle selection device is a heating element. During long-term continuous operation, the temperature at the center of the coil becomes extremely high, which can even damage the insulation layer of the enameled wire, causing a short circuit and burning out the coil. Currently, most coils are encapsulated in plastic, which has poor thermal conductivity, and the dense installation of multiple coils is not conducive to heat dissipation. The heat sink in this invention is placed close to the coil to conduct heat away. The heat sink is made of a non-magnetic material with good thermal and electrical conductivity, such as copper, aluminum, or their alloys. While conducting heat, it also provides both magnetic and electrical shielding, thus playing a role in resisting electromagnetic interference.

[0073] See Figure 1 and Figure 2 As shown, each of the upper and lower pulley group vertical hook groove sections is provided with a corresponding pair of vertical hooks. Each of the upper and lower pulley group pulley groove sections is provided with a corresponding set of pulleys, and the two sets of pulleys are stacked in a staggered manner on the front and rear sides of the double-layer pulley group groove plate. The two pairs of vertical hooks are connected to the upper pulleys of their respective sets of pulleys via pulley lines, and the lower pulleys of the two sets of pulleys are connected to their corresponding head wire connectors via pulley lines. The two pairs of vertical hooks drive their respective sets of pulleys to slide up and down via the upper pulley lines.

[0074] from Figure 5 and Figure 6As can be seen, the two pairs of vertical hooks are a pair of first vertical hooks 6a and a pair of second vertical hooks 6b with the same structure; the two pulley groups are an upper pulley group 7a and a lower pulley group 7b with the same structure; the two electromagnets stacked on top of each other are an upper electromagnet 3a and a lower electromagnet 3b with symmetrical structure; the two pairs of armature hooks are an upper armature hook 4a and a lower armature hook 4b with different structures; the two pairs of springs are a pair of first springs 5a and a pair of second springs 5b with the same structure; and the two pairs of rotating shafts are a first rotating shaft 8a and a second rotating shaft 8b with the same structure.

[0075] Because the upper pulley assembly functional layer and the lower pulley assembly functional layer are designed to overlap internally within the double-layer pulley system groove plate, two sets of pulley systems with identical structures, namely the upper pulley system 7a and the lower pulley system 7b, can be accommodated simultaneously without increasing the thickness of the groove plate. Furthermore, the symmetrical design of the upper electromagnet 3a and the lower electromagnet 3b, and the different hook designs of the upper hook 4a and the lower hook 4b, allow for the use of two pairs of identical vertical hooks within the vertical hook groove sections of both the upper and lower pulley systems, namely a pair of first vertical hooks 6a and a pair of second vertical hooks 6b.

[0076] See Figure 5As shown, the specific structure within the functional layer of the upper pulley assembly is as follows: a pair of first vertical hooks 6a are slidably disposed on the left and right sides of the upper pulley assembly's vertical hook groove section; the upper pulley assembly 7a is slidably disposed on the upper pulley assembly's pulley groove section; the two ends of the pulley line of the upper pulley of the upper pulley assembly 7a are respectively connected to a pair of first vertical hooks 6a; one end of the pulley line of the lower pulley of the upper pulley assembly 7a is fixed, and the other end is connected to the first head wire connector 16a; the first vertical hooks 6a move up and down within the upper pulley assembly's vertical hook groove section with the lifting of the knife, causing the upper pulley assembly 7a to move up and down within the upper pulley assembly's pulley groove section; the upper electromagnet 3a is fixedly installed on the upper end of the electromagnet frame 2; a pair of upper armature hooks 4a are located on the left and right sides of the upper electromagnet 3a, and the pair of upper armature hooks 4a are located inside the pair of first vertical hooks 6a; the shaft holes of the pair of upper armature hooks 4a are connected to the partition plate through a corresponding pair of first rotating shafts 8a. The corresponding points on the front side are rotatably connected. The rear sides of the hook tips of the pair of upper armature hooks 4a are elastically connected to the corresponding points on the left and right sides of the upper part of the electromagnet frame 2 through a pair of first springs 5a. The intersecting magnetic pole surfaces of the upper electromagnet 3a cooperate with the two sides of the pair of upper armature hooks 4a to form corresponding front closed magnetic circuits. Both first rotating shafts 8a are located outside the front closed magnetic circuits, and the hook tips and magnetic poles of the upper armature hooks 4a are on the same side of the first rotating shafts 8a. When the upper electromagnet 3a is energized, the upper armature hooks 4a remain in the front closed magnetic circuit position, and the hook tips of the upper armature hooks 4a do not contact the hook tips of the first vertical hooks 6a, and are in a disengaged state. When the upper electromagnet 3a is not energized, the upper armature hooks 4a move away from the magnetic poles of the upper electromagnet 3a under the action of the first springs 5a, and the hook tips of the upper armature hooks 4a hook the hook tips of the first vertical hooks 6a in a pulling manner, and are in a hooked state.

[0077] See Figure 6As shown, the specific structure within the functional layer of the sliding wheel assembly is as follows: a pair of second vertical hooks 6b are slidably disposed on the left and right sides of the vertical hook groove section of the sliding wheel assembly; the sliding wheel assembly 7b is slidably disposed on the sliding wheel groove section of the sliding wheel assembly; the two ends of the pulley line of the upper pulley of the sliding wheel assembly 7b are respectively connected to a pair of second vertical hooks 6b; one end of the pulley line of the lower pulley of the sliding wheel assembly 7b is fixed, and the other end is connected to the second head wire connector 16b; the second vertical hooks 6b move up and down within the vertical hook groove section of the sliding wheel assembly as the knife is lifted, thereby driving the sliding wheel assembly 7b to move up and down within the sliding wheel groove section of the sliding wheel assembly; the lower electromagnet 3b is fixedly installed at the lower end of the electromagnet frame 2; a pair of lower armature hooks 4b are located on the left and right sides of the lower electromagnet 3b, and the pair of lower armature hooks 4b are located inside the pair of second vertical hooks 6b; the shaft holes of the pair of lower armature hooks 4b are connected to the partition plate through a corresponding pair of second rotating shafts 8b. The corresponding points on the rear side are rotatably connected. The rear sides of the hook tips of the pair of lower armature hooks 4b are elastically connected to the corresponding points on the left and right sides of the lower part of the electromagnet frame 2 through a pair of second springs 5b. The intersecting magnetic pole surfaces of the upper electromagnet 3a cooperate with the two sides of the pair of lower armature hooks 4b to form corresponding closed magnetic circuits on the back side. The two second rotating shafts 8b are located outside the closed magnetic circuits on the back side. The hook tips and magnetic poles of the lower armature hooks 4b are on the same side of the second rotating shafts 8b. When the lower electromagnet 3b is energized, the lower armature hooks 4b are held in the closed magnetic circuit position on the back side. The hook tips of the lower armature hooks 4b do not contact the hook tips of the second vertical hooks 6b and are in a disengaged state. When the lower electromagnet 3b is not energized, the lower armature hooks 4b move away from the magnetic poles of the lower electromagnet 3b under the action of the second springs 5b. The hook tips of the lower armature hooks 4b hook the hook tips of the second vertical hooks 6b in a lifting manner and are in a hooked state.

[0078] See Figure 16 As shown, taking the Staubli M4 / M5 module, which is widely used in the market, as an example, it has the following disadvantages:

[0079] 1. The M4 / M5 assembly lacks a fully linear guide rail for vertical hook lifting; the upper part of the guide rail is intentionally bent. From Figure 11 The middle C indicates the guide groove of the M4 / M5 assembly that restricts the movement of the vertical hook. The upper part of the guide groove is curved, so that the vertical hook will tilt when it moves to this point, forming a disengaged posture.

[0080] 2. The M4 / M5 assembly does not have a fixed-height flange; instead, it uses a molded elastic component. Therefore, if this elastic component is compressed for an extended period during operation (e.g., when the blade is fully extended), it will undergo plastic deformation, lose its elasticity, and cease functioning.

[0081] 3. The M4 / M5 assembly does not have a retaining section for the raised edge, resulting in poor "tool lifting tolerance" performance;

[0082] 4. The M4 / M5 assembly does not have a fixed "unhooking allowance". Due to the curved guide rail, the vertical hook is not vertical in the high position and is tilted. Furthermore, due to the presence of the elastic element, the distance between the tip of the vertical hook and the tip of the armature hook is uncertain.

[0083] 5. The M4 / M5 assembly does not have a "dynamic magnetic gap" design. In fact, its working principle is to move directly from the static magnetic gap to the closed magnetic gap. Its curved guide rail design and elastic element design are intended to press the armature hook as close as possible to the electromagnet pole. However, in operation, factors such as vibration will cause uncertainty.

[0084] To address the shortcomings of Staubli's M4 / M5 components mentioned above, this invention first designs four functional segments in the front structure of the double-layer pulley system: a fully linear upper pulley vertical hook groove segment, an upper pulley line groove segment, an upper pulley pulley groove segment, and an upper pulley lower pulley line groove segment. Similarly, in the rear structure of the double-layer pulley system, four more functional segments are designed: a fully linear lower pulley vertical hook groove segment, a lower pulley upper pulley line groove segment, a lower pulley pulley groove segment, and a lower pulley lower line groove segment. Secondly, this invention improves and optimizes the structure of the first and second vertical hooks.

[0085] See Figure 7 and Figure 8 As shown, the first vertical hook 6a and the second vertical hook 6b of the present invention have the same structure, both including a rod-shaped body 601. The middle part of the outer side of the rod-shaped body 601 is provided with a side ear 602 for hooking with the blade of the lifting knife. When working, the side ear 602 is directly hooked on the blade of the lifting knife. The lifting knife pulls the vertical hook through the side ear 602. The top end of the inner side of the rod-shaped body 601 is provided with a top hook 603, and the hook tip of the top hook 603 is close to the inner edge of the rod-shaped body 601, and the hook bottom of the top hook 603 is close to the axis of the rod-shaped body 601.

[0086] Located on the upper edge of the inner side of the rod-shaped body 601, and below the top hook portion 603, is a protruding edge for laterally pushing and holding the corresponding armature hook in position. This protruding edge extends laterally beyond the hook tip of the top hook portion 603. The contour curve of the protruding edge is divided into an upper pushing section 604a and a lower holding section 604b. The pushing section 604a is an inclined curve starting from the bottom of the hook of the top hook portion 603, and the holding section 604b is a straight line parallel to the moving direction of the rod-shaped body 601. The pushing section 604a and the holding section 604b are smoothly connected. In the initial stage of the upward movement of the vertical hook, the pushing section 604a generates an outward lateral pushing force on the armature hook in contact with it. In the middle and later stages of the upward movement of the vertical hook, the holding section 604b applies a holding force to the armature hook that has already undergone lateral displacement.

[0087] The distance from the bottom of the retaining section 604b to the bottom of the top hook 603 is greater than the distance from the tip of the top hook 603 to the bottom of the top hook 603. This distance difference is also the distance between the tip of the armature hook and the tip of the vertical hook in the disengaged state, and is therefore defined as the disengagement allowance, which is a tolerance margin. See also Figure 7 As shown, Figure 7 D represents the unhooking allowance. Due to the existence of the unhooking allowance D, the hook tip of the armature hook does not contact the top hook of the vertical hook. Even if vibration or other situations occur, the top hook of the vertical hook will not catch the hook tip of the armature hook, thus avoiding the failure to unhook. The unhooking allowance ensures the reliability of the unhooking action under complex working conditions.

[0088] The length of the retaining section 604b of the convex edge corresponds to the tolerance range of the jacquard machine's lifting height allowed by its needle selection device. Within this tolerance range, the armature hook in contact with the convex edge remains in the dynamic magnetic gap 17 position. The retaining section 604b is actually a straight section, and the armature hook in contact with it within this section of the retaining section 604b will not have lateral displacement, but will remain in the dynamic magnetic gap 17 position. The dynamic magnetic gap 17 is the distance between the magnetic pole surface of the armature hook and the magnetic pole surface of the electromagnet under the action of the convex edge, and the value range of the dynamic magnetic gap 17 is 0 to 0.3 mm.

[0089] In the actual operation of a jacquard machine, errors exist in the position of the blade edges of multiple lifting knives due to transmission mechanisms and mechanical forces. The blades can be as long as 2 meters (even longer in high-needle-count jacquard machines), and deformation during operation can lead to positional errors at different points on the same blade. Different jacquard fabric patterns result in uneven force distribution at different points on the same blade, and even different forces on the sides of the blade and the ends of the blade can generate torsional torque, potentially causing permanent deformation. Therefore, the concept of "lifting knife tolerance" arises, referring to the range of blade height differences that the needle selection device can tolerate. Clearly, a needle selection device with a larger "lifting knife tolerance" is beneficial for the overall operation of the jacquard machine. This invention incorporates a retaining section with a raised edge, ensuring that the armature hook remains within a relatively small dynamic magnetic gap over a wide range. When the electromagnet coil is energized, the armature hook can be smoothly attracted to the closed magnetic circuit position, thus achieving the transition from "hooked" to "released" state of the vertical hook, thereby widening the "lifting knife tolerance." This is an important tolerance margin, which reduces the precision requirements of the needle selection device on the jacquard machine's knife lifting position and improves the reliability of the jacquard machine's overall operation switching.

[0090] The inner middle and lower parts of the rod-shaped body 601 are provided with a limiting protrusion 605 along its edge for engaging with the vertical hook guide rail and ensuring that the vertical hook does not undergo lateral displacement. The top end of the limiting protrusion 605 is parallel and straight-line connected to the bottom end of the protrusion retaining section 604b. Since the vertical hook is set in the vertical hook guide rail of the substrate 1, the vertical hook needs to have a matching rod-shaped body 601 to ensure that there is no lateral displacement when the vertical hook moves up and down in the vertical hook guide rail. Since the dynamic magnetic gap 17 is generated by the protrusion and has certain precision requirements, in order to ensure precision, it is necessary to ensure that the movement trajectory of the vertical hook is stable and that there is no other lateral displacement while the vertical hook moves up and down; otherwise, the size of the dynamic magnetic gap cannot be controlled.

[0091] At least one damping groove 606 is provided between the side ear portion 602 and the rod-shaped body 601 to block the vibration of the lifting knife, so as to prevent the vibration of the lifting knife from being transmitted to the top hook portion 603 through the side ear portion 602 and improve the reliability of the operation. The number of damping grooves 606 can be designed according to the requirements, for example, it can be designed as follows: Figure 7 The single-slot design shown can also be designed as follows: Figure 8 The dual-slot design is shown.

[0092] The aforementioned optimizations and improvements actually provide a new hook release technology, involving the design of the vertical hook shape and the hook release allowance formed by the linear guide rail and the raised edge of the vertical hook. This allows electromagnets to be stacked vertically with the hooks facing each other (the upper hook facing downwards, the lower hook facing upwards), so that the upper and lower electromagnets can use the same vertical hook. This technology is not currently disclosed in existing technologies. Although existing technologies involve stacking electromagnets, they use a scheme of vertical hooks of different lengths in the same direction, which would cause inconsistencies in the working states of the upper and lower needle selectors.

[0093] The magnetic circuit structure in the upper pulley assembly functional layer of the present invention consists of an upper electromagnet 3a and two upper armature hooks 4a, and the magnetic circuit structure in the lower pulley assembly functional layer consists of a lower electromagnet 3b and two lower armature hooks 4b.

[0094] See Figure 9 As shown, both the upper hook 4a and the lower hook 4b include a straight rod portion 401, a magnetic pole surface sliding contact portion 404, a magnetic pole surface attracting contact portion 405, a shaft hole portion 402, a hook tip portion 403, and a spring positioning post 406. The cross-section of the straight rod portion 401 is rectangular, but not limited to a rectangle. The shaft hole portion 402 is disposed at one end of the straight rod portion 401 through the magnetic pole surface sliding contact portion 404. The hook tip portion 403 is disposed at the other end of the straight rod portion 401 through the magnetic pole surface attracting contact portion 405. The spring positioning post 406 is disposed on the side wall of the straight rod portion 401 facing the electromagnet.

[0095] See Figure 5 and Figure 6 As shown, the difference lies in the fact that the shaft hole 402 of the lower hook 4b is at the lower end of the straight rod 401, and the hook tip 403 is at the upper end of the straight rod 401, while the shaft hole 402 of the upper hook 4a is at the upper end of the straight rod 401, and the hook tip 403 is at the lower end of the straight rod 401. Furthermore, the hook tip 403 of the lower hook 4b is designed as a "lifting hook" structure, while the hook tip 403 of the upper hook 4a is designed as a "pulling hook" structure.

[0096] See Figure 9 As shown, the upper electromagnet 3a and the lower electromagnet 3b have the same structure, both consisting of an I-beam core 301 with enameled wire wound around it. One end of the I-beam core 301 has a long magnetic pole 302, and the other end has a short magnetic pole 303. During installation, the long magnetic pole 302 of the upper electromagnet 3a is on top, and the short magnetic pole 303 is on the bottom, while the long magnetic pole 302 of the lower electromagnet 3b is on the bottom, and the short magnetic pole 303 is on top. Figure 9As can be clearly seen, the long magnetic pole 302 has a first bend that curves backward at both ends, and the short magnetic pole 303 has a second bend that curves forward at both ends. The first bend and the second bend are offset from each other, and the offset is equal to the thickness of the straight rod 401. This is what distinguishes this invention from traditional solutions. The core of a traditional solution is usually a planar structure with the magnetic poles facing the same direction. The core of this invention is actually a three-dimensional spatial structure.

[0097] The recessed surface of the first bend serves as a sliding magnetic pole surface 304. A magnetically conductive plastic cover 306 is disposed in front of the sliding magnetic pole surface 304, with a gap between the magnetically conductive plastic cover 306 and the sliding magnetic pole surface 304 to form a groove for easy insertion of the straight rod portion 401. A magnetically conductive elastic element 307 for contacting the straight rod portion 401 is disposed in the groove. The side end face of the second bend serves as an attraction magnetic pole surface 305. The sliding magnetic pole surface 304 and the attraction magnetic pole surface 305, located on the same side, constitute two intersecting magnetic pole surfaces.

[0098] See Figures 2-3 As shown, during assembly, the shaft hole portions 402 of the upper armature hook 4a and the lower armature hook 4b are rotatably mounted on the first rotating shaft 8a and the second rotating shaft 8b, respectively. One end of the first spring 5a is fixed on the spring positioning post 406 of the upper armature hook 4a, and one end of the second spring 5b is fixed on the spring positioning post 406 of the lower armature hook 4b. The other ends of the first spring 5a and the second spring 5b are respectively fixedly connected to corresponding points on the side wall of the electromagnet frame 2.

[0099] See Figure 9 As shown, after assembly, the magnetic pole surface sliding contact portion 404 is tightly and slidably embedded in the groove formed by the sliding magnetic pole surface 304, the magnetically conductive plastic cover 306, and the magnetically conductive elastic element 307. The magnetic pole surface attracting contact portion 405 is laterally aligned with the attracting magnetic pole surface 305. When the magnetic pole surface attracting contact portion 405 is in contact with the attracting magnetic pole surface 305, three sides of the magnetic pole surface sliding contact portion 404 are in contact with the sliding magnetic pole surface 304, the magnetically conductive plastic cover 306, and the magnetically conductive elastic element 307, respectively, forming a three-sided magnetically conductive structure with excellent magnetic conductivity. This allows the sliding magnetic pole surface 304, the magnetic pole surface sliding contact portion 404, the straight rod portion 401, the magnetic pole surface attracting contact portion 405, and the attracting magnetic pole surface 305 to form a closed magnetic circuit.

[0100] After assembly, the mating surfaces of the hook tip 403 of the upper hook 4a and the top hook 603 of the first vertical hook 6a are at the same height as the mating surfaces of the hook tip 403 of the lower hook 4b and the top hook 603 of the second vertical hook 6b when in the hooked state.

[0101] When the vertical hook moves upward, the pushing section of the upper convex edge of the vertical hook laterally pushes the armature hook in contact with it to rotate around the corresponding pivot. The magnetic pole surface attraction contact 405 of the armature hook moves from the static magnetic gap position away from the magnetic pole surface 305 of the electromagnet to the direction close to the magnetic pole surface 305 of the electromagnet. The retaining section of the convex edge keeps the magnetic pole surface attraction contact 405 of the armature hook in the dynamic magnetic gap position close to the magnetic pole surface 305 of the electromagnet. At this time, the coil of the electromagnet is energized and attracts the magnetic pole surface attraction contact 405 of the armature hook to the closed magnetic circuit position. The retaining section of the convex edge does not generate a force for the lateral displacement of the armature hook, thereby causing the hook tip of the armature hook to disengage from the top hook of the vertical hook.

[0102] When the vertical hook descends and the coil of the electromagnet is not energized, the magnetic pole surface 305 of the electromagnet does not generate an attraction force on the magnetic pole surface attraction contact part 405 of the armature hook. The spring will give the armature hook an outward elastic force. When the vertical hook descends to the point where its top hook part is aligned with the hook tip of the armature hook, the spring gains release space and rotates the magnetic pole surface attraction contact part 405 of the armature hook directly from the closed magnetic circuit position through the dynamic magnetic gap position to the static magnetic gap position. At this time, the hook tip of the armature hook is just engaged with the top hook part of the vertical hook, thereby connecting the hook tip of the armature hook with the top hook part of the vertical hook.

[0103] from Figure 9 As can be clearly seen, the shaft hole portion 402 is located outside the closed magnetic circuit and does not participate in the magnetic conduction path of the closed magnetic circuit. This design not only allows the magnetic pole face attraction contact portion 405 of the armature hook to be aligned with the attraction magnetic pole face 305 of the I-shaped iron core 301 in terms of height, so that when the magnetic circuit is closed, the magnetic pole face attraction contact portion 405 of the armature hook can be in close contact with the end face of the attraction magnetic pole face 305 of the I-shaped iron core 301, but also allows the magnetic pole face sliding contact portion 404 of the armature hook to maintain sliding contact with the sliding magnetic pole face 304 of the I-shaped iron core 301 when the armature hook rotates around the axis at a certain angle, thus maintaining a low magnetic resistance magnetic circuit connection.

[0104] from Figure 9As can be clearly seen, the electromagnet and the armature hook form a closed magnetic circuit. In the prior patent 1 mentioned in the background art, the armature hook's rotation axis is located at one magnetic pole of the iron core, forming an arc-shaped magnetic gap. However, in actual manufacturing, the arc-shaped magnetic gap is difficult to control; a small gap may result in inflexible rotation, while a large gap affects the electromagnet's attraction force. In contrast, the rotation axis of this invention is not in a closed magnetic circuit, and the armature hook makes planar sliding contact with the side of the magnetic pole. This results in a smaller magnetic gap and makes it easier to ensure dimensional consistency and batch uniformity during parts manufacturing.

[0105] The advantage of having the shaft at the magnetic pole is that it provides constant magnetic reluctance. Simply removing the shaft from the magnetic pole position creates a double-ended magnetic gap, where the armature hooks form movable magnetic gaps with varying magnetic reluctance at both ends of the I-beam core, making it more difficult to control. The technical solution of this invention, with its planar sliding magnetic gap, also features relatively stable magnetic reluctance, avoiding the aforementioned double-ended magnetic gap. This spatially tortuous magnetic circuit design also achieves another purpose: by torturing the magnetic circuit, it connects the electromagnet located in the middle position with the armature hooks located on both sides, allowing two independent needle selection devices to be accommodated in a single unit.

[0106] The magnetic pole of the armature hook of the present invention can move between three positions: from the static magnetic gap 18 to the dynamic magnetic gap 17 is a segment with a large stroke, which is achieved by the vertical hook protrusion pushing the armature hook to move laterally when the vertical hook moves upward (using external force to achieve a large stroke displacement); from the dynamic magnetic gap 17 to the closed magnetic circuit position is a segment with a small stroke, which is achieved by the electromagnetic force after the electromagnet is energized (using internal force to achieve a small stroke displacement).

[0107] See Figure 6As shown, it can be clearly seen that the right side of the sliding wheel assembly is in a disengaged state. The lower armature hook 4b on the right is pushed by the protruding edge of the second vertical hook 6b on the right towards the short magnetic pole on the right side of the lower electromagnet 3b, i.e., the position of the dynamic magnetic gap 17, which is a very small magnetic gap. It is known that the electromagnetic force of an electromagnet is inversely proportional to the square of the distance. In the case of a small magnetic gap, the energization of the coil of the lower electromagnet 3b will generate a relatively large electromagnetic force, attracting the lower armature hook 4b on the right towards the short magnetic pole on the right side of the lower electromagnet 3b, i.e., the closed magnetic circuit position. At this time, the second spring 5b on the right is compressed. As long as the attraction force of the lower electromagnet 3b on the lower armature hook 4b when energized is greater than the elastic force of the second spring 5b on the right, then when the second vertical hook 6b on the right moves down, even without the action of the protruding edge on the second vertical hook 6b, the lower armature hook 4b on the right will remain in this closed magnetic circuit position by electromagnetic force. When the second vertical hook 6b on the right continues to move downwards until its hook tip aligns with the hook tip of the lower bit hook 4b on the right, the existence of a disengagement allowance ensures that the second vertical hook 6b on the right can smoothly descend below the lower bit hook 4b on the right, achieving reliable disengagement. This is actually a new disengagement technology that uses disengagement allowance parameters from the design phase to ensure operational reliability under complex working conditions.

[0108] Limiting the dynamic magnetic gap 17 to a relatively small range, such as 0–0.3 mm, is crucial to this invention and also a matter of tolerance margin. With a small magnetic gap, the electromagnet coil can generate sufficient attraction with relatively low power consumption to engage the armature hook with the magnetic pole and maintain this state. Limiting the dynamic magnetic gap 17 to 0.4 mm is not impossible, but simple calculations show that the electromagnet would require approximately 80% more electromagnetic force, which is clearly disadvantageous for low-power designs. Setting the dynamic magnetic gap 17 to 0.2 mm would certainly result in lower power consumption, but this value also has the function of compensating for machining errors, assembly errors, and deformation errors during operation. Therefore, setting the dynamic magnetic gap to 0.2 mm implies higher precision requirements for components, thus increasing costs.

[0109] See Figure 6 As shown, it can be clearly seen that the left side of the functional layer of the sliding wheel assembly is in a hook state. The lower armature hook 4b on the left is pushed away from the short magnetic pole position on the left side of the lower electromagnet 3b by the second spring 5b on the left, hooking the second vertical hook 6b on the left, forming a considerable static magnetic gap 18. The lateral displacement of the lower armature hook 4b on the left is actually a rotation around the corresponding pivot. In this embodiment, the pivot is located below the lower electromagnet 3b. The sliding groove section of the vertical hook of the sliding wheel assembly engages with the protruding edges on the rods of the two second vertical hooks 6b, ensuring that the second vertical hooks 6b have no lateral displacement when moving up and down.

[0110] See Figure 5 As shown, it can be clearly seen that the right side of the upper pulley assembly is in the disengaged state. The first vertical hook 6a on the right pushes the upper armature hook 4a on the right towards the short magnetic end of the upper electromagnet 3a, which is in the dynamic magnetic gap position. The first spring 5a on the right is compressed. At this time, the coil of the upper electromagnet 3a is energized. The attraction force of the upper electromagnet 3a is greater than the elastic force of the first spring 5a on the right. The upper armature hook 4a on the right will be drawn into the closed magnetic circuit position and held in this position. If the first vertical hook 6a on the right moves downward, disengagement can be achieved.

[0111] See Figure 5 As shown, it can be clearly seen that the left side of the upper pulley assembly's functional layer is in a hook state. Under the action of the first spring 5a on the left side, the upper armature hook 4a moves away from the short magnetic pole of the upper electromagnet 3a, reaching the static magnetic gap 18 position, where it is hooked with the first vertical hook 6a on the left. It can be seen that the shape of the upper armature hook 4a is different from the shape of the lower armature hook 4b, but the shape of the first vertical hook 6a is the same as the shape of the second vertical hook 6b. This design is very useful in high-density needle selectors that require two electromagnets stacked vertically. Traditional technology in such cases can only use a combination of long vertical hooks (suitable for the upper armature hook) and short vertical hooks (suitable for the lower armature hook), and this structural difference in the length of the hooks causes differences in action.

[0112] See Figure 5 and Figure 6 As shown, the surface of the partition 1 is provided with a limiting protrusion to prevent the armature hook from moving excessively laterally outward under the action of the spring, and the limiting protrusion does not interfere with the movement of the vertical hook within the vertical hook guide rail.

[0113] See Figure 12 As shown, the top of the electromagnet frame 2 is provided with a printed circuit board slot 19, and metal springs 11 for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot 19. Coil lead grooves 12, first spring mounting holes 13, and second spring mounting holes 14 are provided on both the left and right sides of the electromagnet frame 2. The first spring 5a and the second spring 5b are respectively fixed to corresponding points on the left and right sides of the electromagnet frame 2 through the first spring mounting holes 13 and the second spring mounting holes 14.

[0114] See Figure 10 and Figure 11As shown, the pulley assembly includes two mounting plates 701, two pulleys 702, two ball bearings 703, two pulley shafts 704, a bracket pressing protrusion 705, and a bracket pressing hole 706. The two pulleys 702 are respectively mounted at the upper and lower ends of the pulley bracket formed by the two mounting plates 701 through their respective sets of ball bearings 703 and pulley shafts 704. The width of the two mounting plates 701 is smaller than the diameter of the pulleys 702. The thickness of the two mounting plates 701 is equal, serving as positioning sliders when the pulley assembly moves within the pulley groove section of the upper pulley assembly or the pulley groove section of the lower pulley assembly.

[0115] Pulley system: This refers to a movable pulley system, consisting of upper and lower pulleys. Fixed pulleys can change the direction of force, while movable pulleys serve two purposes: saving effort and shortening the stroke. In the needle selection unit, the pulley system primarily shortens the stroke; that is, the pulley system's stroke is half the needle lifting stroke. Essentially, the upper pulley "stores" half the needle lifting stroke, which is then released through the lower pulley. Three-position / multi-position systems utilize this principle. The upper pulley lines are connected in parallel, while the lower pulley lines are connected in series. The lower pulley lines can release the stroke "stored" by multiple upper pulleys.

[0116] Pulley line: The line acting on the pulley. There are two pulley lines: the one acting on the upper pulley is called the upper pulley line, and the one acting on the lower pulley is called the lower pulley line. Typically, in a movable pulley system, the upper pulley line is the driving side, and the lower pulley line is the output side, connecting to the load. In this invention, the vertical hook connected to the end of the upper pulley line is driven by the lifting knife. One end of the lower pulley line is fixed, and the other end is the "head line," connecting the warp yarn and heddle yarn, controlling the up-and-down movement of the warp yarn, and is the load.

[0117] Pulley blocks can be equipped with either ball bearings or sliding bearings. In current pulley block structures, ball bearings offer significantly better load-bearing capacity than sliding bearings. However, ball bearings are limited by the size of the balls and bearing supports, making it difficult to reduce their thickness. Furthermore, the pulley groove itself is thin, and its space occupied by the groove is also limited. This invention addresses this by symmetrically arranging thicker pulley components with thinner pulley grooves, and by stacking the two thicker pulley components vertically in a staggered manner. This achieves a high-density arrangement of thicker ball bearing pulley blocks, making this solution well-suited for high-speed, high-load applications.

[0118] The high-density needle selection device of this invention does not reduce the number of parts, but rather rationally arranges the space, making the relative positions of the parts more compact and correspondingly increasing the precision requirements. In the design of electromagnets, the attraction force of an electromagnet is basically positively correlated with its volume; therefore, to ensure the attraction force of an electromagnet, it is necessary to ensure the space of the electromagnet. This invention uses two electromagnets stacked one on top of the other, effectively maintaining the volume of a single electromagnet, thereby ensuring that the electromagnet has sufficient attraction force. The electromagnet frame is used to relatively fix the positional relationship of the electromagnet poles, facilitating production and assembly, ensuring precision, and guaranteeing quality for mass production.

[0119] See Figure 13 As shown, an A-type single-layer slotted plate section can be formed by assembling a second substrate 10 and a first substrate 9 from front to back. Multiple A-type single-layer slotted plate sections are then stacked sequentially from front to back, and finally, a second substrate 10 is assembled on the back side of the assembly, thus forming an A-type multi-layer slotted plate assembly. Each slot in the A-type single-layer slotted plate section can accommodate a set of upper pulley assemblies, each corresponding to a needle selection unit. Simultaneously, the slots between adjacent A-type single-layer slotted plate sections can also accommodate a set of lower pulley assemblies, each corresponding to a needle selection unit. That is, a set of upper pulley assemblies can be accommodated between the right side of each second substrate 10 and the left side of the opposite first substrate 9, and a set of lower pulley assemblies can be accommodated between the right side of each first substrate 9 and the left side of the opposite second substrate 10. This allows one A-type multi-layer slotted plate assembly to correspond to multiple needle selection units, meeting the requirements of the needle selector assembly.

[0120] See Figure 14 As shown, a B-type single-layer slotted plate section can also be formed by assembling a first substrate 9 and a second substrate 10. Multiple B-type single-layer slotted plate sections are then stacked sequentially from left to right, and finally, a first substrate 9 is assembled on the rightmost side of the assembly, thus forming a set of B-type multi-layer slotted plate assemblies. In this way, each slot in the B-type single-layer slotted plate section can accommodate a set of pulley assemblies, each corresponding to a needle selection unit; simultaneously, the slots between two adjacent B-type single-layer slotted plate sections can also accommodate a set of upper pulley assemblies, each corresponding to a needle selection unit. That is, a set of pulley assemblies can be accommodated between the right side of each first substrate 9 and the left side of the opposite second substrate 10, and a set of upper pulley assemblies can be accommodated between the right side of each second substrate 10 and the left side of the opposite first substrate 9. This allows one set of B-type multi-layer slotted plate assemblies to correspond to multiple needle selection units, meeting the requirements of the needle selector assembly.

[0121] Preferably, the upper, middle and lower parts of the first substrate 9 and the second substrate 10 are respectively provided with fixing sections, and each fixing section is provided with a through hole 14. After all the second substrates 10 and the first substrates 9 are alternately stacked and spliced, the fasteners are used to cooperate with the through holes 14 to achieve further fixation.

[0122] Based on the above two types of multi-layer slotted plate assemblies (Type A and Type B), see [link / reference]. Figure 15 As shown, the present invention can also be used to manufacture a 16-needle high-density needle selection device assembly composed of eight high-density needle selection devices based on double-layer pulley slot plates as disclosed above. During stacking, the devices can be stacked alternately in the form of the first substrate 9 in front and the second substrate 10 behind, or alternately in the form of the second substrate 10 in front and the first substrate 9 behind.

[0123] It should be noted that the technical solution of this invention is not limited to manufacturing a 16-needle high-density needle selection device assembly; it can also be used to manufacture needle selection device assemblies with even higher densities. Based on this, this invention can further be used to manufacture an electronic jacquard machine equipped with the high-density needle selection device assembly as disclosed above.

[0124] 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 high-density needle selection device based on a double-layer pulley system groove plate, characterized in that: The system includes a double-layer pulley block groove plate, with the front and rear interlayers of the double-layer pulley block groove plate being an upper pulley assembly functional layer and a lower pulley assembly functional layer, respectively. The upper pulley block functional layer is divided into four functional segments from top to bottom: a fully linear upper pulley block vertical hook groove segment, an upper pulley block linear groove segment, an upper pulley block pulley groove segment, and an upper pulley block lower pulley linear groove segment. The lower pulley block functional layer is also divided into four functional segments from top to bottom: a fully linear lower pulley block vertical hook groove segment, a lower pulley block upper pulley linear groove segment, and a lower pulley block pulley groove segment. The system comprises four functional sections: the lower pulley assembly and the lower pulley line groove. Each of the upper and lower pulley assembly vertical hook groove sections is equipped with a pair of identical vertical hooks. Each of the upper and lower pulley assembly pulley groove sections is equipped with a corresponding set of identical pulleys. The two sets of pulleys are stacked in a staggered manner on the front and rear sides of the double-layer pulley assembly groove plate. The two pairs of vertical hooks drive their respective sets of pulleys to slide up and down via the upper pulley line. The top of the double-layer pulley system is provided with a partition (1). Two electromagnets are stacked on the partition (1) through an electromagnet skeleton (2), and the two electromagnets have two intersecting magnetic pole surfaces. A pair of armature hooks are provided on the left and right sides of the two electromagnets to cooperate with a pair of vertical hooks on the same side. The two pairs of armature hooks are designed differently and are located inside the pair of vertical hooks on the same side. The shaft holes of the two pairs of armature hooks are rotatably connected to the front and rear sides of the partition (1) through a pair of rotating shafts provided on the partition (1). The rear sides of the hook tips of the two pairs of armature hooks are elastically connected to the left and right sides of the electromagnet skeleton (2) through a pair of springs. The intersecting magnetic pole surfaces of the two electromagnets cooperate with the two sides of their respective pair of armature hooks to form a closed magnetic circuit. The two pairs of rotating shafts are located outside the two closed magnetic circuits, and the hook tips and magnetic poles of the armature hooks are on the same side of the rotating shafts. The double-layer pulley system includes a second substrate (10), a first substrate (9), and a second substrate (10) assembled from front to back, or a first substrate (9), a second substrate (10), and a first substrate (9) assembled from front to back. The rear side groove of the second substrate (10) and the front side groove of the first substrate (9) are combined to form the upper pulley assembly functional layer; the rear side groove of the first substrate (9) and the front side groove of the second substrate (10) are combined to form the lower pulley assembly functional layer. The upper pulley assembly functional layer and the lower pulley assembly functional layer are arranged to overlap with the first substrate (9) or the second substrate (10) located in the middle, and the positions of the upper pulley group vertical hook groove section and the lower pulley group vertical hook groove section are corresponding and have the same thickness. The upper pulley group pulley groove section is positioned in a front-to-back correspondence with the lower pulley group upper pulley line groove section. The thickest pulley group support section of the upper pulley group pulley groove section is located at the center of the double-layer pulley group groove plate, while the lower pulley group upper pulley line groove section is located on both sides of the double-layer pulley group groove plate. They can be nested without spatial conflict. The lower pulley groove section of the upper pulley group corresponds to the pulley groove section of the lower pulley group in front and behind, and the lower pulley groove section of the upper pulley group is located on both sides of the double-layer pulley group groove plate, and does not conflict with the pulley group support section of the lower pulley groove section of the lower pulley group located at the center of the double-layer pulley group groove plate. The upper pulley group pulley groove section and the lower pulley group pulley groove section are designed to be stacked in a staggered manner on the front and rear sides, and the upper pulley group pulley groove section and the lower pulley group pulley groove section have the same thickness.

2. The high-density needle selection device based on a double-layer pulley system groove plate according to claim 1, characterized in that: Both the first substrate (9) and the second substrate (10) are plastic parts formed by injection molding in one step. The front and back sides of the first substrate (9) and the second substrate (10) are respectively provided with buckles. The rear side of the second substrate (10) and the front side of the first substrate (9) are superimposed and spliced ​​through the corresponding buckles. The rear side of the first substrate (9) and the front side of the second substrate (10) are superimposed and spliced ​​through the corresponding buckles. Furthermore, the lower side end face of the first substrate (9) and the lower side end face of the second substrate (10) are respectively provided with positioning notches (20) for judging whether the two are spliced ​​correctly. When the first substrate (9) and the second substrate (10) are spliced ​​with the correct side groove shape facing each other, the positioning notch (20) on the first substrate (9) and the positioning notch (20) on the second substrate (10) fit together left and right.

3. The high-density needle selection device based on a double-layer pulley system groove plate according to claim 1, characterized in that: When the second substrate (10), the first substrate (9), and the second substrate (10) are combined, the first substrate (9) in the middle is used as the central substrate. At this time, the partition (1), the electromagnet skeleton (2), and the two electromagnets stacked on top of the first substrate (9) are provided on the top of the two second substrates (10) on both sides, and heat sinks (15) corresponding to the positions of their respective electromagnets are provided on the top of the substrates (10). When the first substrate (9), the second substrate (10), and the first substrate (9) are combined, the second substrate (10) in the middle is used as the central substrate. At this time, the partition (1), the electromagnet skeleton (2), and the two electromagnets stacked on top of the second substrate (10) are provided on the top of the two first substrates (9) on both sides, and heat sinks (15) corresponding to the positions of their respective electromagnets are provided on the top of the substrates (9). The heat sink (15) is used to dissipate heat from the coil of the electromagnet and also serves as electromagnetic shielding. The heat sink (15) is made of non-magnetic metal material, and at least one side of the heat sink (15) is exposed and in good contact with the metal body to conduct heat and electricity to the outside.

4. The high-density needle selection device based on a double-layer pulley system groove plate according to claim 1, characterized in that: The grooves on the front side of the first substrate (9) from top to bottom are: the first half of the vertical hook groove of the upper pulley group (901), the first half of the upper pulley line groove of the upper pulley group (902), the first half of the pulley groove of the upper pulley group (903), and the first half of the lower pulley line groove of the upper pulley group (904); the grooves on the rear side of the second substrate (10) from top to bottom are: the second half of the vertical hook groove of the upper pulley group (1001), the second half of the upper pulley line groove of the upper pulley group (1002), the second half of the pulley groove of the upper pulley group (1003), and the second half of the lower pulley line groove of the upper pulley group (1004). When the rear side of the second substrate (10) is joined to the front side of the first substrate (9), the second half of the vertical hook sliding groove (1001) of the upper pulley group and the first half of the vertical hook sliding groove (901) of the upper pulley group are joined together to form the vertical hook sliding groove section of the upper pulley group. The second half of the upper pulley line groove (1002) of the upper pulley group and the first half of the upper pulley line groove (902) of the upper pulley group are joined together to form the upper pulley line groove section of the upper pulley group. The second half of the pulley sliding groove (1003) of the upper pulley group and the first half of the pulley sliding groove (903) of the upper pulley group are joined together to form the pulley sliding groove section of the upper pulley group. The second half of the lower pulley line groove (1004) of the upper pulley group and the first half of the lower pulley line groove (904) of the upper pulley group are joined together to form the lower pulley line groove section of the upper pulley group. The grooves on the rear side of the first substrate (9) from top to bottom are: the first half of the vertical hook groove of the lower slide wheel group (905), the first half of the upper pulley line groove of the lower slide wheel group (906), the first half of the pulley groove of the lower slide wheel group (907), and the first half of the lower slide wheel line groove of the lower slide wheel group (908); the grooves on the front side of the second substrate (10) from top to bottom are: the second half of the vertical hook groove of the lower slide wheel group (1005), the second half of the upper pulley line groove of the lower slide wheel group (1006), the second half of the pulley groove of the lower slide wheel group (1007), and the second half of the lower slide wheel line groove of the lower slide wheel group (1008). When the rear side of the first substrate (9) and the front side of the second substrate (10) are joined together, the first half of the sliding groove (905) of the vertical hook of the lower wheel assembly and the second half of the sliding groove (1005) of the vertical hook of the lower wheel assembly are joined together to form the sliding groove section of the vertical hook of the lower wheel assembly. The first half of the sliding groove (906) of the upper pulley line of the lower wheel assembly and the second half of the sliding groove (1006) of the upper pulley line of the lower wheel assembly are joined together to form the sliding groove section of the upper pulley line of the lower wheel assembly. The first half of the sliding groove (907) of the lower wheel assembly and the second half of the sliding groove (1007) of the lower wheel assembly are joined together to form the sliding groove section of the lower wheel assembly. The first half of the sliding groove (908) of the lower wheel assembly and the second half of the sliding groove (1008) of the lower wheel assembly are joined together to form the sliding groove section of the lower wheel assembly.

5. The high-density needle selection device based on a double-layer pulley system groove plate according to claim 1, characterized in that: The two pairs of vertical hooks are a pair of first vertical hooks (6a) and a pair of second vertical hooks (6b) with identical structures; the two pulley groups are an upper pulley group (7a) and a lower pulley group (7b) with identical structures; the two electromagnets stacked vertically are an upper electromagnet (3a) and a lower electromagnet (3b) with symmetrical structures; the two pairs of armature hooks are an upper armature hook (4a) and a lower armature hook (4b) with different structures; the two pairs of springs are a pair of first springs (5a) and a pair of second springs (5b) with identical structures; the two pairs of rotating shafts are a first rotating shaft (8a) and a second rotating shaft (8b) with identical structures. The specific structure within the functional layer of the upper pulley assembly is as follows: a pair of first vertical hooks (6a) are respectively slidably disposed on the left and right sides of the vertical hook groove section of the upper pulley assembly; the upper pulley assembly (7a) is slidably disposed on the pulley groove section of the upper pulley assembly; the pair of first vertical hooks (6a) are connected to the upper pulley of the upper pulley assembly (7a) via pulley lines located in the groove section of the upper pulley line of the upper pulley assembly; and the lower pulley of the upper pulley assembly (7a) is connected to the first pulley via pulley lines located in the groove section of the lower pulley line of the upper pulley assembly. The head (16a) is connected; the first vertical hook (6a) moves up and down with the lifting knife in the vertical hook groove section of the upper pulley group, driving the upper pulley group (7a) to move up and down in the pulley groove section of the upper pulley group; the upper electromagnet (3a) is fixedly installed on the upper end of the electromagnet frame (2), and a pair of upper armature hooks (4a) are respectively located on the left and right sides of the upper electromagnet (3a), and the pair of upper armature hooks (4a) are located inside the pair of first vertical hooks (6a), and the shaft holes of the pair of upper armature hooks (4a) are connected by a corresponding pair of first rotating shafts (8). a) Rotary connection with the corresponding point on the front side of the partition (1), the rear side of the hook tip of the pair of upper armature hooks (4a) is elastically connected to the corresponding points on the upper left and right sides of the electromagnet frame (2) through a pair of first springs (5a), the intersecting magnetic pole surfaces of the upper electromagnet (3a) respectively cooperate with the two sides of the pair of upper armature hooks (4a) to form corresponding front closed magnetic circuits, and the two first rotating shafts (8a) are all located outside the front closed magnetic circuits, and the hook tip and magnetic pole of the upper armature hook (4a) are both in the first On the same side of a rotating shaft (8a); when the upper electromagnet (3a) is energized, the upper armature hook (4a) remains in the front closed magnetic circuit position, and the hook tip of the upper armature hook (4a) does not contact the hook tip of the first vertical hook (6a), and is in a disengaged state; when the upper electromagnet (3a) is not energized, the upper armature hook (4a) moves away from the magnetic pole of the upper electromagnet (3a) under the action of the first spring (5a), and the hook tip of the upper armature hook (4a) hooks the hook tip of the first vertical hook (6a) in a pulling manner, and is in a hooked state; The specific structure within the functional layer of the sliding wheel assembly is as follows: a pair of second vertical hooks (6b) are respectively slidably disposed on the left and right sides of the vertical hook groove section of the sliding wheel assembly; the sliding wheel assembly (7b) is slidably disposed within the pulley groove section of the sliding wheel assembly; the pair of second vertical hooks (6b) are connected to the upper pulley of the sliding wheel assembly (7b) via pulley lines located within the upper pulley line groove section of the sliding wheel assembly; and the sliding wheel of the sliding wheel assembly (7b) is connected to the second upper pulley via pulley lines located within the lower pulley line groove section of the sliding wheel assembly. The head (16b) is connected; the second vertical hook (6b) moves up and down with the lifting knife in the vertical hook groove section of the lower sliding wheel group, driving the lower sliding wheel group (7b) to move up and down in the sliding wheel groove section of the lower sliding wheel group; the lower electromagnet (3b) is fixedly installed at the lower end of the electromagnet frame (2), and a pair of lower bit hooks (4b) are respectively located on the left and right sides of the lower electromagnet (3b), and the pair of lower bit hooks (4b) are located inside the pair of second vertical hooks (6b), and the shaft holes of the pair of lower bit hooks (4b) are connected by a pair of corresponding second rotating shafts (8). b) Rotary connection with the corresponding point on the rear side of the partition (1), the rear side of the hook tip of the pair of lower armature hooks (4b) is elastically connected to the corresponding points on the left and right sides of the lower part of the electromagnet frame (2) through a pair of second springs (5b), the intersecting magnetic pole surfaces of the lower electromagnet (3b) respectively cooperate with the two sides of the pair of lower armature hooks (4b) to form corresponding back closed magnetic circuits, and the two second rotating shafts (8b) are all located outside the back closed magnetic circuits, and the hook tip and magnetic pole of the lower armature hook (4b) are both in the first On the same side of the two rotating shafts (8b); when the lower electromagnet (3b) is energized, the lower armature hook (4b) remains in the closed magnetic circuit position on the back, and the hook tip of the lower armature hook (4b) does not contact the hook tip of the second vertical hook (6b), and is in a disengaged state; when the lower electromagnet (3b) is not energized, the lower armature hook (4b) moves away from the magnetic pole of the lower electromagnet (3b) under the action of the second spring (5b), and the hook tip of the lower armature hook (4b) hooks the hook tip of the second vertical hook (6b) in a lifting manner, and is in a hooked state.

6. The high-density needle selection device based on a double-layer pulley system groove plate according to claim 1, characterized in that: The vertical hook includes a rod-shaped body (601), with a side ear (602) for hooking with the blade edge of a lifting knife at the middle of the outer side of the rod-shaped body (601). A top hook (603) is provided at the top of the inner side of the rod-shaped body (601), with the hook tip of the top hook (603) close to the inner edge of the rod-shaped body (601) and the hook base close to the axis of the rod-shaped body (601). 1) A raised edge is provided on the upper inner edge, below the top hook (603), for laterally pushing and holding the corresponding armature hook in position. The raised edge protrudes laterally from the hook tip of the top hook (603). The contour curve of the raised edge is divided into a pushing section (604a) in the upper section and a holding section (604b) in the lower section. The pushing section (604a) is an inclined curve starting from the bottom of the hook of the top hook (603). The holding section (604b) is a straight line parallel to the moving direction of the rod-shaped body (601), and the pushing section (604a) is smoothly connected to the holding section (604b); the distance from the bottom of the holding section (604b) to the bottom of the hook of the top hook (603) is greater than the distance from the tip of the hook of the top hook (603) to the bottom of the hook of the top hook (603); the length of the holding section (604b) of the convex edge corresponds to the jacquard machine knife lifting height allowed by its needle selection device. The tolerance range; the middle and lower parts of the inner side of the rod-shaped body (601) are provided with a limiting protrusion (605) for engaging with the vertical hook guide rail and ensuring that the vertical hook does not have lateral displacement, and the top end of the limiting protrusion (605) is connected in a straight line parallel to the bottom end of the protrusion retaining section (604b); at least one damping groove (606) is provided between the side ear (602) and the rod-shaped body (601) for blocking the vibration of the lifting knife.

7. The high-density needle selection device based on a double-layer pulley system groove plate according to claim 1, characterized in that: The armature hook includes a straight rod portion (401), a magnetic pole surface sliding contact portion (404), a magnetic pole surface attracting contact portion (405), a shaft hole portion (402), a hook tip portion (403), and a spring positioning post (406). The straight rod portion (401) has a rectangular cross-section. The shaft hole portion (402) is disposed at one end of the straight rod portion (401) through the magnetic pole surface sliding contact portion (404). The hook tip portion (403) is disposed at the other end of the straight rod portion (401) through the magnetic pole surface attracting contact portion (405). The spring positioning post (406) is disposed on the side wall of the straight rod portion (401) facing the electromagnet. The electromagnet is formed by winding enameled wire around an I-shaped iron core (301). One end of the I-shaped iron core (301) has a long magnetic pole (302), and the other end has a short magnetic pole (303). The long magnetic pole (302) has a first bend that curves backward at both ends, and the short magnetic pole (303) has a second bend that curves forward at both ends. The first bend and the second bend are offset from each other, and the offset is equal to the thickness of the straight rod (401). The concave surface of the first bend serves as a sliding magnetic pole. The side end face of the second bend serves as the magnetic pole face (305) for attraction. The sliding magnetic pole face (304) and the magnetic pole face (305) located on the same side constitute two intersecting magnetic pole faces. A magnetically conductive plastic cover (306) is provided in front of the sliding magnetic pole face (304). There is a gap between the magnetically conductive plastic cover (306) and the sliding magnetic pole face (304) to form a groove for easy insertion of the straight rod (401). A magnetically conductive elastic element (307) for contacting the straight rod (401) is provided in the groove. After assembly, the shaft hole (402) is rotatably mounted on the rotating shaft, one end of the spring is fixed to the spring positioning post (406), and the other end of the spring is fixedly connected to the corresponding point on the side wall of the electromagnet frame (2); the magnetic pole surface sliding contact part (404) is tightly embedded in the groove formed by the sliding magnetic pole surface (304), the magnetically conductive plastic cover (306), and the magnetically conductive elastic element (307), and the magnetic pole surface attracting contact part (405) is laterally aligned with the attracting magnetic pole surface (305); the magnetic pole surface attracting contact part (405) contacts the attracting magnetic pole surface (305) at the... In this case, the three sides of the sliding contact portion (404) of the magnetic pole surface are in contact with the sliding magnetic pole surface (304), the magnetically conductive plastic cover (306), and the magnetically conductive elastic element (307), respectively, so that the sliding magnetic pole surface (304), the sliding contact portion (404) of the magnetic pole surface, the straight rod portion (401), the magnetic pole surface attraction contact portion (405), and the attraction magnetic pole surface (305) constitute the closed magnetic circuit; the shaft hole portion (402) is located outside the closed magnetic circuit and does not participate in the magnetic conductive path of the closed magnetic circuit; the mating points of the two pairs of armature hooks and their respective pairs of vertical hooks are at the same position and height.

8. The high-density needle selection device based on a double-layer pulley system groove plate according to claim 1, characterized in that: The pulley assembly includes two mounting plates (701), two pulleys (702), two ball bearings (703), two pulley shafts (704), a bracket pressing protrusion (705), and a bracket pressing hole (706). The two pulleys (702) are respectively set at the upper and lower ends of the pulley bracket formed by the two mounting plates (701) through their respective sets of ball bearings (703) and pulley shafts (704). The width of the two mounting plates (701) is smaller than the diameter of the pulleys (702). The thickness of the two mounting plates (701) is equal, so as to serve as positioning sliders when the pulley assembly moves within the pulley groove section of the upper pulley assembly or the pulley groove section of the lower pulley assembly.

9. A high-density needle selection device assembly, characterized in that: The assembly comprises a 16-needle high-density needle selection device using eight high-density needle selection devices based on a double-layer pulley system as described in any one of claims 1-8.

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