High-density needle selection device based on thin pulley block and assembly of high-density needle selection device

Abstract

The high-density needle selection device comprises a substrate and a spacer, the substrate is internally provided with two sets of thin pulley blocks which are stacked front and back and two pairs of vertical hooks which correspond to the thin pulley blocks and are of the same design, and the substrate is further provided with double electromagnets which are stacked up and down and two pairs of armature hooks which correspond to the double electromagnets and are of different designs. Different armature hook designs of the upper and lower electromagnets enable the front and rear surfaces of the substrate to adopt vertical hooks with the same shape; the shaft hole part of the armature hook is rotatably connected with the substrate, and the rotating shaft is outside a closed magnetic circuit of the electromagnet, so that the magnetic circuit is not influenced and is not influenced by the magnetic circuit. The device is compact in overall structure, reasonable in magnetic circuit design, low in power consumption and reliable in work; the pulley yoke structure shaped like the Chinese character'wang 'is adopted, so that the thin pulley block can work stably, the needle lifting density of the needle selection device is improved, and two sets of needle selection devices of the double-position double-lift jacquard machine are accommodated in one unit; the arrangement of the metal radiating fins has an electromagnetic shielding effect, so that the working reliability of the high-density needle selection device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic jacquard machines of textile machinery, and in particular relates to a high-density needle selection device based on a thin pulley block and a component thereof. Background Art

[0002] In recent years, electronic jacquard machines have made great progress. Electronic jacquard machines use a key component called a needle selection device (also called a solenoid valve, electromagnet, assembly, etc.). The needle selection device is the executive component of the electronic jacquard machine, and its function is to convert electrical signals into the rise and fall of the warp yarn. The working principle of the needle selection device is a well-known technology. It is similar to the principle of an electromagnetic relay and is a monostable device: when the coil is not energized, there is no electromagnetic force and the armature is not attracted. Under the action of the reset spring, the armature magnetic pole is away from the core magnetic pole and is in position 1 (stable position); when the coil is energized, an electromagnetic force is generated to attract the armature, and the armature magnetic pole is attracted to the core magnetic pole, and the armature is in position 2 (temporary steady state position).

[0003] In the needle selection device, the armature is made into a hook shape, called an armature hook, and there is also a vertical hook that can move up and down with the jacquard knife. When the vertical hook is unhooked from the armature hook, it is called the "unhooked" state, and the vertical hook moves with the knife; when the vertical hook is hooked on the armature hook, it is called the "hung" state, and the vertical hook is detached from the knife and does not move with the knife. It can usually be designed that position 1 (stable position) is the "hung" state, and position 2 (temporary steady position) is the "unhooked" state, or vice versa. Since the vertical hook connects the harness and the heald to control the warp yarn, the rise and fall of the vertical hook corresponds to the rise and fall of the warp yarn.

[0004] Jacquard machines are divided into single-action and double-action types. The double-action type has a complex mechanism. One jacquard needle corresponds to two vertical hooks, and the two vertical hooks are converted into the rise and fall of one jacquard needle through a pulley block. The double-action type has little damage to the warp yarn and is conducive to weaving. Currently, most electronic jacquard machines are double-action type. The needle selection device produced in large quantities commercially often makes 8 electromagnets and corresponding mechanisms into a combination for easy installation and maintenance.

[0005] The double-action needle selection device has a complex mechanism and many parts, and it is bound to occupy a certain space to be realized. The needle selection device is arranged in a dense matrix in the electronic jacquard machine to form a needle box, and several needle boxes constitute the electronic jacquard machine. The volume of the needle selection device directly affects the volume of the electronic jacquard machine, affects the length of the knife lifting, and affects the design of the mechanism that drives the knife lifting movement. The present application proposes a concept of needle lifting density, which is defined as the number of needle lifting per unit area (the area is the projected surface area orthogonal to the needle lifting). Then the needle lifting density of the needle selection device is: the ratio of the number of needle lifting of the needle selection device to its projected area; the needle lifting density of the jacquard machine is: the ratio of the number of needle lifting of the jacquard machine to its projected area. Obviously, jacquard machines with the same number of needles have smaller volumes with higher densities.

[0006] At present, a needle selection device is widely used in the market, and its needle density is 8 needles corresponding to 4×3.5cm 2 , about 5714 needles per square meter, 0.57 needles per square centimeter. When using this needle selection device to make a jacquard machine, the projection area of ​​a 5120-needle faucet is close to 1 square meter, and a 10,000-needle faucet is 2 square meters. It is difficult to make a faucet with a larger number of needles mechanically. It is also difficult to assemble such a huge machine in coordination with the loom. This is the bottleneck that restricts the development of jacquard machines with large needle counts. If there is a high-density needle selection device, such as doubling the needle density of the needle selection device, it is possible to make 10,000 or even more than 10,000 needle faucets.

[0007] The Chinese invention application "yarn selection device, double shed weaving system and loom equipped with the weaving system", patent number 98116491.9 (hereinafter referred to as prior patent 1), and the European patent application "three-position opening jacquard machine", application number: 0723041 (hereinafter referred to as prior patent 2), both use two electromagnet solutions stacked up and down. Among them, the solution of prior patent 2 requires the jacquard machine to have two sets of upper and lower lifting knives, and there are problems with the large size and power consumption of the electromagnets, which is not compact enough. Prior patent 1 proposes a solution of using two electromagnets to control the "hook pair", where the "hook" corresponds to the "vertical hook" in the needle selection device, and the "hook pair" is a "pair" composed of two related hooks. The solution of prior patent 1 cannot directly produce a three-position opening, and the three-position opening can only be produced through the action of the complex pulley group connected to the "hook pair". Since the "hook pair" is two hooks moving in association, which is different from two independently moving vertical hooks, the solution in prior patent 1 cannot replace the two independent vertical hooks to increase the needle lifting density of the two-position needle selection device, nor can it derive a high-density solution. Summary of the invention

[0008] In order to make up for the deficiencies of the above-mentioned prior art, the present invention provides a high-density needle selection device based on a thin pulley group and its components.

[0009] In order to solve the above technical problems and achieve the above technical effects, the present invention is implemented through the following technical solutions:

[0010] A high-density needle selection device based on a thin pulley block, comprising a substrate and a spacer, wherein the spacer cover is arranged on the front side or the rear side of the substrate, and the front and rear sides of the substrate are provided with a pulley block slide groove located in the middle and full-range linear vertical hook guide rails located on the left and right sides; a pair of vertical hooks with the same structure are respectively arranged in the vertical hook guide rails on the front and rear sides of the substrate; a group of thin pulley blocks with the same structure are respectively arranged in the pulley block slide grooves on the front and rear sides of the substrate, and the two pairs of vertical hooks respectively drive a corresponding group of thin pulley blocks to slide up and down through an upper pulley line;

[0011] Two electromagnets stacked up and down are arranged on the top of the substrate through an electromagnet skeleton, and the two electromagnets have two intersecting magnetic pole surfaces; a pair of armature hooks for cooperating with a pair of vertical hooks on the same side are respectively arranged on the left and right sides of the two electromagnets, and the two pairs of armature hooks are designed differently and are respectively located on the inner sides of a pair of vertical hooks on the same side, and the axial hole parts of the two pairs of armature hooks are respectively rotatably connected to the front and back sides of the substrate through a pair of rotating shafts arranged on the substrate, and the rear side surfaces of the hook tips of the two pairs of armature hooks are elastically connected to the left and right sides of the electromagnet skeleton through a pair of springs, respectively, and the intersecting magnetic pole surfaces of the two electromagnets are respectively matched with the two side surfaces of the corresponding pair of armature hooks to form a closed magnetic circuit, and the two pairs of rotating shafts are respectively located outside the two closed magnetic circuits, and the hook tips and magnetic pole parts of the armature hooks are on the same side of the rotating shaft. On the same side, the length of the armature hook is smaller than the solution between the hook tip and the magnetic pole portion of the rotating shaft, so the armature hook is lighter and the overall volume of the electromagnet is smaller and more compact.

[0012] Furthermore, the structures on the front and rear surfaces of the substrate are respectively A surface and B surface, and the pulley block slide groove and the vertical hook guide rail located on the front side of the substrate are respectively A surface pulley block slide groove and A surface vertical hook guide rail, and the pulley block slide groove and the vertical hook guide rail located on the rear side of the substrate are respectively B surface pulley block slide groove and B surface vertical hook guide rail; the two pairs of vertical hooks are respectively a pair of first vertical hooks and a pair of second vertical hooks with the same structure; the two thin pulley blocks are respectively a first thin pulley block and a second thin pulley block with the same structure; the two electromagnets stacked up and down are respectively an upper electromagnet and a lower electromagnet with symmetrical structures; the two pairs of armature hooks are respectively a lower armature hook and an upper armature hook with different structures; the two pairs of springs are respectively a pair of first springs and a pair of second springs with the same structure; the two pairs of rotating shafts are respectively a first rotating shaft and a second rotating shaft with the same structure;

[0013] The specific structure of the A surface is that a pair of the first vertical hooks can be slidably arranged in the vertical hook guide rails of the A surface on the left and right sides respectively, the first thin pulley group can be slidably arranged in the pulley group slide groove of the A surface up and down, a pair of the first vertical hooks are connected with the two ends of the upper pulley line of the first thin pulley group, and the two ends of the lower pulley line of the first thin pulley group are respectively fixed and connected with the first first line joint; the first vertical hook drives the first thin pulley group to rise and fall in the pulley group slide groove of the A surface as the knife is lifted in the vertical hook guide rails on both sides of the A surface; the lower electromagnet is fixedly installed at the lower end of the electromagnet skeleton, a pair of the lower armature hooks are respectively located on the left and right sides of the lower electromagnet, and a pair of the lower armature hooks are located on the inner sides of the pair of first vertical hooks, and the axial hole parts of the pair of lower armature hooks are connected to the corresponding front side of the substrate through the corresponding pair of the first rotating shafts. The hook tip of the lower armature hook is connected to the corresponding point on the left and right sides of the lower part of the electromagnet skeleton through a pair of the first springs, and the intersecting magnetic pole surfaces of the lower electromagnet cooperate with the two side surfaces of the pair of the lower armature hooks to form two corresponding surface closed magnetic circuits, and the two first rotating shafts are both located outside the A surface closed magnetic circuit, and the hook tip and the magnetic pole of the lower armature hook are on the same side of the first rotating shaft; when the lower electromagnet is energized, the lower armature hook is maintained in the surface closed magnetic circuit position, and the hook tip of the lower armature hook does not contact the hook tip of the first vertical hook, and is in a decoupled state; when the lower electromagnet is not energized, the lower armature hook moves away from the magnetic pole of the lower electromagnet under the action of the first spring, and the hook tip of the lower armature hook hooks the hook tip of the first vertical hook in a lifting manner, and is in a hooked state;

[0014] The specific structure of the B surface is that a pair of the second vertical hooks can be slidably arranged in the B-surface vertical hook guide rails on the left and right sides respectively, the second thin pulley group can be slidably arranged in the B-surface pulley group slide groove, a pair of the second vertical hooks are connected to the upper pulley line of the second thin pulley group, and the two ends of the lower pulley line of the second thin pulley group are respectively fixed and connected to the second first line joint; the second vertical hook drives the second thin pulley group to rise and fall in the pulley group slide groove of the B surface as the knife is lifted in the vertical hook guide rails on both sides of the B surface; the upper electromagnet is fixedly installed on the upper end of the electromagnet skeleton, a pair of the upper armature hooks are respectively located on the left and right sides of the upper electromagnet, and a pair of the upper armature hooks are located on the inner side of the pair of second vertical hooks, and the axial hole parts of the pair of upper armature hooks are connected to the corresponding points on the rear side of the substrate through the corresponding pair of the second rotating shafts. The upper armature hook is rotatably connected to the upper part of the electromagnet frame, and the rear side surfaces of the hook tips of a pair of the upper armature hooks are elastically connected to the corresponding points on the left and right sides of the upper part of the electromagnet frame through a pair of the second springs. The intersecting magnetic pole surfaces of the upper electromagnet cooperate with the two side surfaces of a pair of the upper armature hooks to form two corresponding surface closed magnetic circuits, and the two second rotating shafts are both located outside the B surface closed magnetic circuit, and the hook tip and the magnetic pole portion of the upper armature hook are on the same side of the second rotating shaft; when the upper electromagnet is energized, the upper armature hook remains in the surface closed magnetic circuit position, and the hook tip of the upper armature hook does not contact the hook tip of the second vertical hook, and is in a decoupled state; when the upper electromagnet is not energized, the upper armature hook moves away from the magnetic pole of the upper electromagnet under the action of the second spring, and the hook tip of the upper armature hook hooks the hook tip of the second vertical hook in a pulling manner, and is in a hooked state.

[0015] The two wheels are connected to each other with a pair of cams, and the two wheels are connected with each other with a pair of cams, and the cams are connected with each other with a pair of cams.

[0016] The width of the vertical plate is smaller than the diameter of the thin pulley, and a buffer and shock-absorbing structure is provided in the middle of the vertical plate by means of a groove; the width of the middle horizontal plate is slightly larger than the diameter of the thin pulley, and the left and right ends of the middle horizontal plate have the same thickness, so as to serve as a positioning slider when the thin pulley group moves in the pulley group slide groove; the widths of the upper horizontal plate and the lower horizontal plate are equal, and the widths of the upper horizontal plate and the lower horizontal plate are both smaller than the width of the middle horizontal plate, and larger than the width of the vertical plate.

[0017] Furthermore, the sliding bearing assembly includes a journal and a sleeve, the journal is arranged on the axis of the thin pulley, and the sleeves are respectively arranged on the vertical plates on the front and rear sides; the journal and the sleeve are made of metal materials with similar hardness, wherein the hardness of the sleeve is greater than the hardness of the journal; an oil storage tank is opened on the journal, and a sealing cover for covering the oil storage tank is arranged on the outer periphery of the sleeve.

[0018] Furthermore, the vertical hook includes a rod-shaped body, a side ear portion for hooking with the blade of a knife is provided in the middle of the outer side of the rod-shaped body, a top hook portion is provided at the top end of the inner side of the rod-shaped body, and the hook tip of the top hook portion is close to the edge of the inner side of the rod-shaped body, and the hook bottom of the top hook portion is close to the axis of the rod-shaped body; a convex edge for laterally pushing the armature hook on the corresponding side and maintaining its position is provided at the upper edge of the inner side of the rod-shaped body and below the top hook portion, and the convex edge protrudes laterally from the hook tip of the top hook portion; the contour curve of the convex edge is divided into a pushing section located in the upper section and a holding section located in the lower section, and the pushing section is provided at the lower section. The shifting section is an inclined curve starting from the bottom of the hook of the top hook part, the holding section is a straight line parallel to the moving direction of the rod-shaped body, and the pushing section is smoothly connected with the holding section; the distance from the bottom of the holding section to the bottom of the hook of the top hook part is greater than the distance from the hook tip of the top hook part to the bottom of the hook of the top hook part; the length of the holding section of the convex edge corresponds to the tolerance range of the jacquard machine knife lifting height allowed by the needle selection device to which it belongs; the middle and lower parts of the inner side of the rod-shaped body are provided along their edges with a limiting convex edge for engaging with the vertical hook guide rail and ensuring that the vertical hook does not produce lateral displacement, and the top end of the limiting convex edge is connected to the bottom end of the convex edge holding section in a parallel straight line.

[0019] Furthermore, at least one shock-absorbing groove for isolating the vibration of the knife is provided between the side ear and the rod-shaped body.

[0020] Further, the armature hook comprises a straight rod portion, a magnetic pole surface sliding contact portion, a magnetic pole surface suction contact portion, an axial hole portion, a hook tip portion and a spring positioning column, the cross section of the straight rod portion is rectangular, the axial hole portion is arranged at one end of the straight rod portion through the magnetic pole surface sliding contact portion, the hook tip portion is arranged at the other end of the straight rod portion through the magnetic pole surface suction contact portion, and the spring positioning column is arranged on the side wall of the straight rod portion facing the electromagnet side;

[0021] The electromagnet is formed by winding enameled wire around an I-shaped iron core, a cross beam at one end of the I-shaped iron core is a long magnetic pole, and a cross beam at the other end of the I-shaped iron core is a short magnetic pole; the left and right ends of the long magnetic pole have a first bending portion bent backward, and the left and right ends of the short magnetic pole have a second bending portion bent forward, the first bending portion and the second bending portion are in a front-to-back offset form, and the offset amplitude is equal to the thickness of the straight rod portion; the concave surface of the first bending portion serves as a sliding magnetic pole surface, and the side end surface of the second bending portion serves as an attraction magnetic pole surface, and the sliding magnetic pole surface and the attraction magnetic pole surface located on the same side constitute two intersecting magnetic pole surfaces; a magnetic conductive plastic upper cover is arranged in front of the sliding magnetic pole surface, and there is a spacing between the magnetic conductive plastic upper cover and the sliding magnetic pole surface to form a groove for facilitating the embedding of the straight rod portion, and a magnetic conductive elastic member for contacting the straight rod portion is arranged in the groove.

[0022] After assembly, the shaft hole portion is rotatably mounted on the rotating shaft, one end of the spring is fixed on the spring positioning column, and the other end of the spring is fixedly connected to the corresponding point on the side wall of the electromagnet skeleton; the magnetic pole surface sliding contact portion is tightly embedded in the groove formed by the sliding magnetic pole surface, the magnetic plastic upper cover and the magnetic elastic member, and the magnetic pole surface suction contact portion is laterally aligned with the suction magnetic pole surface; when the magnetic pole surface suction contact portion is in contact with the suction magnetic pole surface, the three sides of the magnetic pole surface sliding contact portion are respectively in contact with the sliding magnetic pole surface, the magnetic plastic upper cover and the magnetic elastic member, so that the sliding magnetic pole surface, the magnetic pole surface sliding contact portion, the straight rod portion, the magnetic pole surface suction contact portion and the suction magnetic pole surface constitute the closed magnetic circuit; the shaft hole portion is located outside the closed magnetic circuit and does not participate in the magnetic conductive path of the closed magnetic circuit; the matching points of the two pairs of armature hooks and the corresponding pair of vertical hooks are at the same position height.

[0023] Furthermore, a printed circuit board slot is provided at the top of the electromagnet skeleton, and metal spring sheets for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot, and coil lead grooves, a first spring mounting hole and a second spring mounting hole are provided on the left and right sides of the electromagnet skeleton.

[0024] Furthermore, a heat sink for dissipating heat for the electromagnet coil and having an electromagnetic shielding function is arranged on the top of the partition. The heat sink is made of non-magnetic metal material, and at least one surface of the heat sink is exposed to be in good contact with the metal body to conduct heat and electricity to the outside.

[0025] A high-density needle selection device assembly is a 16-needle high-density needle selection device assembly formed by stacking 8 of the above-mentioned high-density needle selection devices based on thin pulley groups.

[0026] It should be noted that the technical solution of the present invention is not limited to the production of 16-needle high-density needle selection device components, and can also be used to produce higher-density needle selection device components.

[0027] The present invention also discloses an electronic jacquard machine, which is equipped with the high-density needle selection device assembly disclosed above.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention optimizes and improves the pulley block. First, the "W"-shaped frame design adopted can strengthen the structural stability of the bracket of the pulley block when the vertical plate is thinned. The shaft part of the pulley bearing is changed from the end of the cantilever beam fixed at one end to the middle part fixed at both ends, thereby solving the "support" problem under the condition of the pulley shaft being stressed, and solving the manufacturing difficulty of the ultra-thin pulley block; secondly, the metal sliding bearing scheme is adopted. Compared with the ultra-thin ball bearings which are difficult to manufacture and have high costs, the metal sliding bearings are more suitable for the ultra-thin pulley block and have lower costs; then, an elastic part for shock absorption is designed in the middle of the vertical plate, so as to buffer the vibration and impact in the operation of the mechanism and extend the working life of the pulley block. Therefore, the thin pulley block in the present invention can fully achieve the design goal of reducing the thickness to 2-2.4 mm, and opens up a larger design space for high-density needle selectors and even high-density jacquard machines.

[0030] The present invention optimizes and improves the hook unhooking technology, and adopts the full-range linear vertical hook guide rail and the vertical hook convex edge design to form a new hook unhooking technology. This technology can design a larger hook so that there is no need to worry about the difficulty of unhooking the large hook, and the sufficient design margin can ensure the reliability of the action under complex working conditions. The full-range linear vertical hook guide rail and the vertical hook convex edge cooperate to ensure the accuracy of the lateral displacement of the convex edge to the armature hook when the vertical hook moves up and down, so that a dynamic magnetic gap range of 0 to 0.3 mm can be achieved. In addition, 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, thereby leaving a hook unhooking margin, which is also a tolerance margin, which can prevent misoperation and improve reliability. The retaining section of the convex edge enables the lifting knife to reach the vertical hook switching height (switching from hanging to unhooking) required by the needle selection device within a wide range, and has a wide lifting knife height tolerance range (tolerance margin), which reduces the manufacturing difficulty of the jacquard machine host and improves the reliability of the whole machine action. The vertical hook is provided with one or more shock-absorbing grooves between the side ears and the rod to prevent the vibration of lifting the knife from being transmitted to the hook tip through the side ears, which can also improve the reliability of the action.

[0031] The present invention optimizes and improves the magnetic circuit structure. The electromagnet of the present invention eliminates the large magnetic resistance caused by the "rotating shaft magnetic gap" in the prior art, and improves the efficiency of the electromagnet. The electromagnet of the present invention has few factors affecting the magnetic resistance of the circuit, which is convenient for quality control in mass production. The rotating shaft of the electromagnet of the present invention is not on the closed magnetic circuit, and the resistance of the rotating shaft movement is irrelevant to the electromagnetic force, and the rotating shaft does not have to bear the heavy responsibility of controlling the precision of the magnetic gap, so that a loose design can be adopted to improve the flexibility of the rotating shaft. The length of the armature hook of the electromagnet of the present invention is shortened and the weight is reduced, so that the overall structure of the needle selection device using the electromagnet is compact. The armature of the electromagnet of the present invention contacts the side of the I-shaped iron core cross beam, and under the action of the electromagnetic force, the armature and the magnetic pole part of the I-shaped iron core can be automatically aligned. The electromagnet coil of the present invention has low power consumption, reduces the load of the drive circuit, has low energy consumption, and has low coil temperature. The mechanical deformation of the parts of the needle selection device affected by the temperature rise is reduced, and the tolerance margin to the power supply voltage and the ambient temperature is improved, and the reliability of the action and control is improved.

[0032] The heat sink of the present invention is made of non-magnetic metal material, such as copper sheet or aluminum sheet. The heat sink can not only dissipate heat for the dual electromagnet coil and extract the heat, but also has the function of electromagnetic shielding. While conducting heat, it can perform both magnetic shielding and electrical shielding, thereby playing a role in resisting electromagnetic interference, and further improving the working reliability of the high-density needle selection device.

[0033] The high-density needle selection device of the present invention has a compact overall structure, a reasonable magnetic circuit design, a small electromagnet volume, low power consumption, reliable operation, and uses two independent vertical hooks to increase the needle density of the two-position needle selection device, realizing a needle selection device that accommodates two sets of two-position double-action jacquard machines in one unit. The high-density needle selection device of the present invention can realize a 16-needle needle selection device assembly, corresponding to 4×3.5cm 2 The needle density is as high as 11428 needles per square meter, which is twice the needle selection device components commonly used in the market. Therefore, the high-density needle selection device of the present invention is expected to produce an electronic jacquard machine with 20,000 needles or even a larger number of needles.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 An exploded view of the high-density needle selection device of the present invention;

[0037] Figure 2 It is a schematic diagram of the installation of the substrate A side of the high-density needle selection device of the present invention;

[0038] Figure 3 It is a schematic diagram of the installation of the substrate B side of the high-density needle selection device of the present invention;

[0039] Figure 4 It is a schematic structural diagram of a thin pulley block in a high-density needle selection device of the present invention;

[0040] Figure 5 An exploded view of a thin pulley block in a high-density needle selection device of the present invention;

[0041] Figure 6 It is a structural diagram of an embodiment of a vertical hook in the high-density needle selection device of the present invention;

[0042] Figure 7 It is a structural diagram of another embodiment of a vertical hook in the high-density needle selection device of the present invention;

[0043] Figure 8 It is a schematic structural diagram of the I-shaped iron core and the armature hook of the high-density needle selection device of the present invention when forming a closed magnetic circuit;

[0044] Fig. 9 It is a schematic diagram of the structure of the high-density needle selection device of the present invention after the double electromagnets and the electromagnet frame are assembled;

[0045] Fig.10 It is a schematic diagram of the structure of the spacer in the high-density needle selection device of the present invention;

[0046] Fig.11 It is a structural schematic diagram of a high-density needle selection device assembly of the present invention;

[0047] Fig.12 Schematic diagram of the Stäubli M4 / M5 module substrate. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. The descriptions herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0049] See also Figure 1 As shown, a high-density needle selection device based on a thin pulley group includes a substrate 1, the front side or rear side of the substrate 1 is covered with a spacer 2, and the front and rear sides of the substrate 1 are both provided with a set of A-side action structure and B-side action structure composed of vertical hook guide rails, pulley group slide grooves, vertical hooks, thin pulley groups, electromagnets, armature hooks and other components.

[0050] See also Figure 1 and Figure 2As shown, in the A-surface action structure, the A-surface of the substrate 1 has an A-surface pulley block slideway located at the center line of the A-surface and an A-surface vertical hook guide rail located on the left and right sides of the A-surface and linear throughout the entire range. A first vertical hook 6a that can slide up and down is respectively arranged in the A-surface vertical hook guide rails on the left and right sides. A first thin pulley block 7a that can slide up and down is arranged in the A-surface pulley block slideway. The lower ends of the two first vertical hooks 6a are respectively connected to the two ends of the upper pulley line wound around the upper pulley of the first thin pulley block 7a, and one end of the lower pulley line wound around the lower pulley of the first thin pulley block 7a is connected to the first head line connector 16a, and the other end is fixed. The first vertical hook 6a drives the first thin pulley block 7a to rise and fall in the pulley block slideway of the A-surface in the vertical hook guide rails on both sides of the A-surface as the knife is lifted. A common electromagnet frame 9 is disposed on the top of the substrate 1, and a lower electromagnet 3a is disposed at the lower end of the electromagnet frame 9, and the left and right sides of the lower electromagnet 3a each have two upper and lower intersecting magnetic pole surfaces. Two lower armature hooks 4a are disposed on the left and right sides of the lower electromagnet 3a for limiting the first vertical hook 6a, and the two lower armature hooks 4a are respectively located on the inner sides of the two first vertical hooks 6a. The axial hole portions of the two lower armature hooks 4a are rotationally connected to the corresponding points on the front side of the substrate 1 through a corresponding first rotating shaft 8a, and the rear side surfaces of the hook tips of the two lower armature hooks 4a are elastically connected to the corresponding points on the left and right sides of the lower part of the electromagnet skeleton 9 through a corresponding first spring 5a. The two intersecting magnetic pole surfaces of the lower electromagnet 3a can contact and cooperate with the two side surfaces of the lower armature hook 4a to form a closed magnetic circuit on the A surface, and the two first rotating shafts 8a are located outside the closed magnetic circuit on the A surface, and neither affect the magnetic circuit nor are affected by the magnetic circuit, and the hook tip and the magnetic pole portion of the lower armature hook 4a are on the same side of the first rotating shaft 8a. When the lower electromagnet 3a is energized, the lower armature hook 4a remains in the closed magnetic circuit position on the A surface, and the hook tip of the lower armature hook 4a does not contact the hook tip of the first vertical hook 6a, and is in a dehooking state; when the lower electromagnet 3a is not energized, the lower armature hook 4a moves in the direction away from the magnetic pole of the lower electromagnet 3a under the action of the first spring 5a, and the hook tip of the lower armature hook 4a hooks the hook tip of the first vertical hook 6a in a lifting manner, and is in a hooking state.

[0051] See also Figure 1 and Figure 3As shown, in the B-side action structure, the B-side of the substrate 1 has a B-side pulley block slideway located at the center line of the B-side and a B-side vertical hook guide rail located on the left and right sides of the B-side and fully linear. A second vertical hook 6b that can slide up and down is respectively arranged in the B-side vertical hook guide rails on the left and right sides. A second thin pulley block 7b that can slide up and down is arranged in the B-side pulley block slideway. The lower ends of the two second vertical hooks 6b are respectively connected to the two ends of the upper pulley line wound around the upper pulley of the second thin pulley block 7b, and one end of the lower pulley line wound around the lower pulley of the second thin pulley block 7b is connected to the second first line connector 16b, and the other end is fixed. The second vertical hook 6b drives the second thin pulley block 7b to rise and fall in the pulley block slideway of the B-side as the knife is lifted in the vertical hook guide rails on both sides of the B-side. An upper electromagnet 3b is arranged at the upper end of the electromagnet skeleton 9, and the left and right sides of the upper electromagnet 3b have two upper and lower intersecting magnetic pole surfaces. Two upper armature hooks 4b are respectively arranged on the left and right sides of the upper electromagnet 3b for limiting the second vertical hook 6b, and the two upper armature hooks 4b are respectively located on the inner sides of the two second vertical hooks 6b. The shaft holes of the two upper armature hooks 4b are respectively rotatably connected with the corresponding points on the rear side of the substrate 1 through a corresponding second rotating shaft 8b, and the rear side of the hook tip of the two upper armature hooks 4b is respectively elastically connected with the corresponding points on the left and right sides of the upper part of the electromagnet skeleton 9 through a corresponding second spring 5b. The two intersecting magnetic pole surfaces of the upper electromagnet 3b can contact and cooperate with the two side surfaces of the upper armature hook 4b to form a B-side closed magnetic circuit, and the two second rotating shafts 8b are located outside the B-side closed magnetic circuit, neither affecting the magnetic circuit nor being affected by the magnetic circuit, and the hook tip and magnetic pole of the upper armature hook 4b are both on the same side of the second rotating shaft 8a. When the upper electromagnet 3b is energized, the upper armature hook 4b remains in the closed magnetic circuit position on the B surface, and the hook tip of the upper armature hook 4b does not contact the hook tip of the second vertical hook 6b, and is in a decoupled state; when the upper electromagnet 3b is not energized, the upper armature hook 4b moves away from the magnetic pole of the upper electromagnet 3b under the action of the second spring 5b, and the hook tip of the upper armature hook 4b hooks the hook tip of the second vertical hook 6b in a pulling manner, and is in a hooked state.

[0052] from Figure 1-Figure 3As can be seen, the structures of a pair of first vertical hooks 6a and a pair of second vertical hooks 6b adopt the same design, the structures of the first thin pulley set 7a and the second thin pulley set 7b adopt the same design, the structures of the upper electromagnet 3b and the lower electromagnet 3a pair adopt an up-and-down symmetrical design, the structures of the lower armature hook 4a and the upper armature hook 4b adopt different hook designs, the structures of a pair of first springs 5a and a pair of second springs 5b adopt the same design, and the structures of the first rotating shaft 8a and the second rotating shaft 8b adopt the same design. It is precisely because of the up-and-down symmetrical design of the upper electromagnet 3b and the lower electromagnet 3a, as well as the different hook designs of the lower armature hook 4a and the upper armature hook 4b, that the A-side action structure and the B-side action structure can adopt two pairs of vertical hooks with the same shape, namely a pair of first vertical hooks 6a and a pair of second vertical hooks 6b.

[0053] The present invention first improves and optimizes the pulley set of the existing needle selection device:

[0054] See Figure 4 and Figure 5 As shown in, the first thin pulley set 7a and the second thin pulley set 7b adopted by the present invention have the same structure, and both include two vertical plates 701, two upper cross plates 702, two middle cross plates 703, two lower cross plates 704 and two thin pulleys 705. The vertical plates 701, the upper cross plates 702, the middle cross plates 703 and the lower cross plates 704 are all formed by plastic materials, or the vertical plates 701 are made of metal materials, and the upper cross plates 702, the middle cross plates 703 and the lower cross plates 704 are made of plastic materials and are injection-molded with the vertical plates 701. The combination of metal parts and injection-molded parts is adopted, which is convenient for mass production and quality control.

[0055] Among them, after the two upper cross plates 702 are joined together face to face, an upper layer fixing plate is formed, after the two middle cross plates 703 are joined together face to face, a middle layer fixing plate is formed, and after the two lower cross plates 704 are joined together face to face, a lower layer fixing plate is formed; the upper layer fixing plate, the middle layer fixing plate and the lower layer fixing plate form a "king" - shaped bracket under the front and back clamping of the two vertical plates 701. This kind of "king" - shaped bracket has three mechanical support points, so that the stress condition at the shaft end can be effectively improved. At the same time, a buffer and shock absorption structure 706 is arranged in the middle of the vertical plate 701 by means of grooving, so as to buffer the vibration and impact during the operation of the mechanism and extend the working life of the thin pulley set.

[0056] The front and rear vertical plates 701 are both provided with mounting holes, and all the upper horizontal plates 702, the middle horizontal plates 703 and the lower horizontal plates 704 are all provided with mounting blocks. The upper horizontal plates 702, the middle horizontal plates 703 and the lower horizontal plates 704 are respectively fixedly mounted on the vertical plates 701 on the same side by the cooperation of their respective mounting blocks 711 and the corresponding mounting holes 712. The two middle horizontal plates 703 are divided into a pair of male plates and female plates, the male plates are provided with pressing blocks 709, and the female plates are provided with pressing holes 710. The male plates and the female plates are pressed and fixed by the cooperation of the pressing blocks 709 and the pressing holes 710.

[0057] There is a pulley installation gap between the two vertical plates 701 under the support of the upper fixed plate, the middle fixed plate and the lower fixed plate. The pulley installation gap forms an upper pulley installation gap position and a lower pulley installation gap position in the area between the upper fixed plate and the middle fixed plate and in the area between the middle fixed plate and the lower fixed plate. The two thin pulleys 705 are respectively freely rotatably installed at the upper pulley installation gap position and the lower pulley installation gap position through corresponding sliding bearing assemblies. The pulley installation gap should be slightly larger than the thickness of the thin pulley 705 so as to meet the rotation requirements of the thin pulley 705.

[0058] The width of the vertical plate 701 is smaller than the diameter of the thin pulley 705, the width of the middle horizontal plate 703 is slightly larger than the diameter of the thin pulley 705, and the left and right ends of the middle horizontal plate 703 have the same thickness, so as to serve as positioning sliders 707 when the thin pulley block moves in the pulley block slideway. The widths of the upper horizontal plate 702 and the lower horizontal plate 704 are equal, and the widths of the upper horizontal plate 702 and the lower horizontal plate 704 are both smaller than the width of the middle horizontal plate 703 and larger than the width of the vertical plate 701.

[0059] The sliding bearing assembly includes a journal 713 and a sleeve 714. The journal 713 is arranged on the axis of the thin pulley 705, and the sleeves 714 are respectively arranged on the vertical plates 701 at the front and rear sides. An oil storage tank 715 is provided on the journal 713, and a sealing cover 708 for covering the oil storage tank is provided on the outer periphery of the sleeve 714. The journal 713 and the sleeve 714 are made of metal materials with similar hardness, wherein the hardness rate of the sleeve 714 is greater than the hardness of the journal 713. The metal sliding bearing solution is more suitable for ultra-thin pulley blocks and has lower cost.

[0060] from Figure 1It can be clearly seen that during installation, the two sets of the thin pulley groups can be placed in the first high-density needle selection device unit in a front-to-back stack, and the two sets of the thin pulley groups can be slid up and down in the A-side pulley group slot or the B-side pulley group slot through their respective corresponding positioning sliders 707.

[0061] It should be emphasized that the thickness of the thin pulley block of the present invention is only half of the thickness of the existing pulley block. Therefore, considering the material strength, the thin pulley block of the present invention should use high-strength wear-resistant materials. As the pulley groove becomes narrower, the pulley wire rope used accordingly should also be a thin rope, the thickness of which is adapted to the pulley groove.

[0062] By adopting the above-mentioned design of thin pulley block, the structural stability of the support frame of the pulley block can be enhanced when the vertical plate of the pulley block is thinned, and the force on the end of the cantilever beam fixed at one end is changed to the force on the middle part fixed at both ends, which solves the "support" problem when the pulley shaft is under force and solves the manufacturing difficulty of ultra-thin pulley block.

[0063] The present invention also improves and optimizes the unhooking and hooking technology of the existing needle selection device:

[0064] See also Fig.12 As shown in the figure, taking the M4 / M5 components of Stäubli, which are widely used in the market, as an example, there are the following disadvantages:

[0065] 1. The M4 / M5 assembly does not have a full-range linear guide for the vertical hook lifting and lowering, and the upper part of the guide is intentionally bent. Fig.12 The middle C indicates the guide groove of the M4 / M5 assembly that limits 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 dehooking posture.

[0066] 2. The M4 / M5 assembly does not have a fixed-height convex edge, but a molded elastic part. Therefore, if the M4 / M5 assembly is pressed on this elastic part for a long time during operation (such as when the knife is fully raised), it will cause plastic deformation and lose elasticity and function;

[0067] 3. The M4 / M5 assembly does not have a retaining section with a convex edge, so the "tool lifting tolerance" performance is poor;

[0068] 4. The M4 / M5 assembly does not have a fixed "unhooking margin". Due to the curved guide rail, the vertical hook is not vertical in the high position and is tilted. Due to the presence of the elastic part, the distance between the tip of the vertical hook and the tip of the armature hook is uncertain.

[0069] 5. The M4 / M5 assembly does not have a "dynamic magnetic gap" design. In fact, its working principle is to move directly from a static magnetic gap to a closed magnetic gap. The design of the curved guide rail and the elastic parts are designed to press the armature hook as close to the electromagnet pole as possible. However, due to factors such as vibration during operation, it will cause uncertainty.

[0070] See also Figure 1-Figure 3 As shown, the present invention first designs a fully linear first vertical hook guide rail on the left and right sides of the A surface of the substrate 1, and designs a fully linear second vertical hook guide rail on the left and right sides of the B surface of the substrate 1. The present invention then improves and optimizes the structures of the first vertical hook 6a and the second vertical hook 6b.

[0071] See also Figure 6 and Figure 7 As shown, the first vertical hook 6a and the second vertical hook 6b of the present invention have the same structure and both include a rod-shaped body 601, and a side ear portion 602 for hooking with the blade of the lifting knife is provided in the middle of the outer side of the rod-shaped body 601. When working, the side ear portion 602 is directly hung on the blade of the lifting knife, and the lifting knife pulls the vertical hook to move through the side ear portion 602, and a top hook portion 603 is provided at the top end of the inner side of the rod-shaped body 601, and the hook tip of the top hook portion 603 is close to the inner edge of the rod-shaped body 601, and the hook bottom of the top hook portion 603 is close to the axis of the rod-shaped body 601.

[0072] A convex edge is provided at the upper edge of the inner side of the rod-shaped body 601 and below the top hook 603, which is used to laterally push the armature hook on the corresponding side and keep it in position. The convex edge laterally protrudes from the hook tip of the top hook 603. The contour curve of the convex edge is divided into a pushing section 604a located in the upper section and a retaining section 604b located in the lower section. The pushing section 604a is an inclined curve starting from the bottom of the hook of the top hook 603, and the retaining section 604b is a straight line parallel to the moving direction of the rod-shaped body 601. The pushing section 604a and the retaining section 604b are smoothly connected. In the early stage of the vertical hook upward process, the pushing section 604a can generate an outward lateral thrust on the armature hook in contact with it, and in the middle and late stages of the vertical hook upward process, the retaining section 604b can apply a retaining force to the armature hook that has generated a lateral displacement.

[0073] 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 hook tip of the top hook 603 to the bottom of the top hook 603. This distance difference is also the distance between the hook tip of the armature hook and the hook tip of the vertical hook in the unhooked state, so it is defined as the unhooking margin, which is a tolerance margin. Figure 6 As shown, Figure 6D in the middle represents the unhooking margin. Due to the existence of the unhooking margin D, the hook tip of the armature hook does not contact the top hook part of the vertical hook. Even if vibration or the like occurs, the top hook part of the vertical hook will not catch the hook tip of the armature hook, thereby avoiding the failure of unhooking. The unhooking margin ensures the reliability of the unhooking action under complex working conditions.

[0074] The length of the retaining section 604b of the convex edge corresponds to the tolerance range of the jacquard machine knife lifting height allowed by the needle selection device to which it belongs. Within the tolerance range, the armature hook in contact with the convex edge remains in the position of the dynamic magnetic gap 17. The retaining section 604b is actually a straight section. In this section of the retaining section 604b, the armature hook in contact with it will not have a lateral displacement, but will remain in the position of the dynamic magnetic gap 17. 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.

[0075] In the actual operation of the jacquard machine, due to the transmission mechanism and mechanical stress, there are errors in the position of the blade of multiple blades; the blade is up to 2 meters long (the blade of a large needle number jacquard machine is longer), and the blade will be deformed during work, resulting in errors in the position of different points on the same blade; the jacquard fabric pattern is different, resulting in uneven force on different positions of the same blade, and even different forces on both sides of the blade and at both ends of the blade will produce torsional torque, which will cause permanent deformation of the blade in severe cases. So there is a concept of "blade lifting tolerance", which refers to the range of the height difference of the blade edge allowed by the needle selection device. Obviously, the needle selection device with a large "blade lifting tolerance" is conducive to the operation of the jacquard machine. The present invention is provided with a retaining section of the convex edge, so that within a relatively wide range, the armature hook can be kept in a smaller dynamic magnetic gap. When the electromagnet coil is energized, the armature hook can be smoothly attracted to the closed magnetic circuit position, thereby realizing the state conversion of the vertical hook from "hanging" to "taking off", widening the "blade lifting tolerance". This is an important tolerance margin, which reduces the accuracy requirements of the needle selection device on the jacquard machine's knife position and improves the reliability of the jacquard machine's overall motion switching.

[0076] A section of limiting convex edge 605 is provided along the edge of the middle and lower part of the inner side of the rod-shaped body 601 for engaging with the vertical hook guide rail and ensuring that the vertical hook does not produce lateral displacement, and the top of the limiting convex edge 605 is connected in a parallel straight line with the bottom end of the convex edge holding section 604b. Since the vertical hook is arranged in the vertical hook guide rail of the substrate 1, the vertical hook needs to have a rod-shaped body 601 that cooperates with it to ensure that the vertical hook does not have lateral displacement when it moves up and down in the vertical hook guide rail. Since the dynamic magnetic gap 17 is generated by the convex edge, it has certain precision requirements. Therefore, in order to ensure precision, it is necessary to ensure that the motion trajectory of the vertical hook is stable, and when the vertical hook moves up and down, it is ensured that there is no other lateral displacement, otherwise the size of the dynamic magnetic gap cannot be controlled.

[0077] At least one damping groove 606 is provided between the side ear 602 and the rod-shaped body 601 to block the vibration of the knife lifting, so as to prevent the vibration of the knife lifting from being transmitted to the top hook 603 through the side ear 602, thereby improving the reliability of the operation. The number of the damping grooves 606 can be designed according to the requirements, for example, it can be designed as follows: Figure 6 The single slot method shown can also be designed as Figure 7 Double slot method shown.

[0078] The above optimization and improvement actually provide a new unhooking hook technology, which involves the hook design of the vertical hook and the unhooking margin formed by the linear guide rail and the vertical hook convex edge. This allows the electromagnets to be stacked up and down and the armature hooks to be oriented in opposite directions (the hook of the upper armature hook is downward and the hook of the lower armature hook is upward), so the upper and lower electromagnets can use the same vertical hook. This technology has not been disclosed in the prior art. Although the prior art has stacked electromagnets up and down, it uses a long and short vertical hook solution in the same direction, which will make the working state of the upper and lower needle selectors inconsistent.

[0079] The present invention improves and optimizes the magnetic circuit structure of the existing needle selection device:

[0080] The magnetic circuit structure in the A-side action structure of the present invention is composed of a lower electromagnet 3a and two lower armature hooks 4a, and the magnetic circuit structure in the B-side action structure is composed of an upper electromagnet 3b and two upper armature hooks 4b.

[0081] See also Figure 8As shown, the lower armature hook 4a and the upper armature hook 4b both include a straight rod portion 401, a pole surface sliding contact portion 404, a pole surface suction contact portion 405, an axial hole portion 402, a hook tip portion 403 and a spring positioning column 406. The cross-section of the straight rod portion 401 is rectangular, but not limited to a rectangle. The axial hole portion 402 is arranged at one end of the straight rod portion 401 through the pole surface sliding contact portion 404, and the hook tip portion 403 is arranged at the other end of the straight rod portion 401 through the pole surface suction contact portion 405. The spring positioning column 406 is arranged on the side wall of the straight rod portion 401 facing the electromagnet.

[0082] See also Figure 1-Figure 3 As shown, the difference is that the shaft hole portion 402 of the lower armature hook 4a is at the lower end of the straight rod portion 401, and the hook tip portion 403 is at the upper end of the straight rod portion 401, while the shaft hole portion 402 of the upper armature hook 4b is at the upper end of the straight rod portion 401, and the hook tip portion 403 is at the lower end of the straight rod portion 401. In addition, the hook tip portion 403 of the lower armature hook 4a is designed as a "lifting hook" structure, while the hook tip portion 403 of the upper armature hook 4b is designed as a "lifting hook" structure.

[0083] See also Figure 8 As shown, the lower electromagnet 3a and the upper electromagnet 3b are both formed by winding enameled wire around an I-shaped iron core 301, one end of the I-shaped iron core 301 is a long magnetic pole 302, and the other end of the I-shaped iron core 301 is a short magnetic pole 303. During installation, the long magnetic pole 302 of the lower electromagnet 3a is at the bottom and the short magnetic pole 303 is at the top, while the long magnetic pole 302 of the upper electromagnet 3b is at the top and the short magnetic pole 303 is at the bottom. Figure 8 It can be clearly seen that the left and right ends of the long magnetic pole 302 have first bent portions bent backward, and the left and right ends of the short magnetic pole 303 have second bent portions bent forward, and the first bent portion and the second bent portion are in a front-to-back misalignment form, and the misalignment amplitude is equal to the thickness of the straight rod portion 401. This is what makes the present invention different from the traditional solution. The iron core of the traditional solution is usually a planar structure with the magnetic poles facing the same direction, while the iron core of the present invention is actually a three-dimensional structure.

[0084] The concave surface of the first bending portion is used as a sliding magnetic pole surface 304, and a magnetic plastic upper cover 306 is arranged in front of the sliding magnetic pole surface 304. There is a gap between the magnetic plastic upper cover 306 and the sliding magnetic pole surface 304 to form a groove for the straight rod 401 to be inserted, and a magnetic elastic member 307 for contacting the straight rod 401 is arranged in the groove. The side end surface of the second bending portion is used 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.

[0085] See also Figure 2-Figure 3 As shown, during assembly, the axial hole portions 402 of the lower armature hook 4a and the upper 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 column 406 of the lower armature hook 4a, one end of the second spring 5b is fixed on the spring positioning column 406 of the upper armature hook 4b, and the other ends of the first spring 5a and the second spring 5b are fixedly connected to corresponding points on the side wall of the electromagnet skeleton 9, respectively.

[0086] See also Figure 8 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 magnetic conductive plastic upper cover 306 and the magnetic conductive elastic member 307, and the magnetic pole surface suction contact portion 405 is laterally aligned with the suction magnetic pole surface 305. When the magnetic pole surface suction contact portion 405 is in contact with the suction magnetic pole surface 305, the three sides of the magnetic pole surface sliding contact portion 404 are respectively in contact with the sliding magnetic pole surface 304, the magnetic conductive plastic upper cover 306 and the magnetic conductive elastic member 307, forming a three-sided magnetic conductive effect with excellent magnetic conductive effect, so that the sliding magnetic pole surface 304, the magnetic pole surface sliding contact portion 404, the straight rod portion 401, the magnetic pole surface suction contact portion 405 and the suction magnetic pole surface 305 form a closed magnetic circuit.

[0087] After assembly, the matching surfaces of the hook tip 403 of the lower armature hook 4a and the top hook portion 603 of the first vertical hook 6a and the matching surfaces of the hook tip 403 of the upper armature hook 4b and the top hook portion 603 of the second vertical hook 6b are at the same height position in the hooking state.

[0088] When the vertical hook moves upward, the pushing section of the convex edge on the vertical hook laterally pushes the armature hook in contact with it to rotate around the corresponding rotating shaft, and the pole surface attraction contact portion 405 of the armature hook moves from the static magnetic gap position away from the attraction pole surface 305 of the electromagnet to the direction close to the attraction pole surface 305 of the electromagnet, and the pole surface attraction contact portion 405 of the armature hook is stopped at the dynamic magnetic gap position close to the attraction pole surface 305 of the electromagnet by the holding section of the convex edge. At this time, the coil of the electromagnet is energized to attract the pole surface attraction contact portion 405 of the armature hook to the closed magnetic circuit position, and the holding 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 separate from the top hook portion of the vertical hook.

[0089] When the vertical hook moves downward and the coil of the electromagnet is not energized, the attraction pole surface 305 of the electromagnet does not generate an adsorption force on the attraction contact portion 405 of the pole surface of the armature hook, and the spring gives the armature hook an outward elastic force. When the vertical hook moves downward until its top hook portion is aligned with the hook tip portion of the armature hook, the spring obtains a release space, and rotates the attraction contact portion 405 of the pole surface of the armature hook from the closed magnetic circuit position directly through the dynamic magnetic gap position to the static magnetic gap position. At this time, the hook tip portion of the armature hook is just stuck in the top hook portion of the vertical hook, so that the hook tip portion of the armature hook is hooked with the top hook portion of the vertical hook.

[0090] from Figure 8 It can be clearly seen that 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 surface suction contact portion 405 of the armature hook to be aligned with the suction magnetic pole surface 305 of the I-shaped iron core 301 in height position, so that the magnetic pole surface suction contact portion 405 of the armature hook can just be in close contact with the end face of the suction magnetic pole surface 305 of the I-shaped iron core 301 when the magnetic circuit is closed, but also allows the magnetic pole surface sliding contact portion 404 of the armature hook to maintain sliding contact with the sliding magnetic pole surface 304 of the I-shaped iron core 301 when the armature hook rotates around the rotating shaft at a certain angle, thereby maintaining a magnetic circuit connection with low magnetic resistance.

[0091] from Figure 8 It can be clearly seen that the electromagnet and the armature hook form a closed magnetic circuit. In the prior patent 1 mentioned in the background technology, the armature hook's rotating shaft is at one of the magnetic poles of the iron core, forming an arc-shaped magnetic gap. However, in actual processing, the arc-shaped magnetic gap is difficult to control. A small magnetic gap may make the rotation inflexible, and a large magnetic gap affects the electromagnet's suction. However, the rotating shaft of the present invention is not in a closed magnetic circuit, and the armature hook is in planar sliding contact with the side of the magnetic pole. On the one hand, the magnetic gap is small, and on the other hand, it is easier to ensure the consistency of the external dimensions and batch size during parts processing.

[0092] The advantage of the rotating shaft at the magnetic pole is that it has a constant magnetic resistance. If the rotating shaft is simply moved away from the magnetic pole position, a double-end magnetic gap will be formed, that is, the armature hook forms an active magnetic gap with changing magnetic resistance at both magnetic poles of the I-beam core, which is more difficult to control. The technical solution of the present invention also has the characteristic of basically stable magnetic resistance in the plane sliding magnetic gap, avoiding the aforementioned double-end magnetic gap. This spatial twisted magnetic circuit design also achieves a purpose, that is, through the twisting of the magnetic circuit, the electromagnet located in the middle position is connected to the armature hooks located on both sides, so that two sets of independent needle selection devices can be accommodated in one unit.

[0093] The magnetic pole end 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 section with a larger range, which is achieved by the vertical hook convex edge pushing the armature hook to move horizontally when the vertical hook moves upward (using external force to achieve a larger range of displacement); from the dynamic magnetic gap 17 to the closed magnetic circuit position is a section with a smaller range, which is achieved by the electromagnetic force after the electromagnet is energized (using internal force to achieve a smaller range of displacement).

[0094] Figure 2 This is a schematic diagram of the installation diagram of the A-side action structure of the present invention, and it can be clearly seen that Figure 2 The right side of the figure is in the unhooked state, and the lower armature hook 4a on the right side is pushed by the convex edge of the first vertical hook 6a on the right side to the short magnetic pole position on the right side of the lower electromagnet 3a, that is, the position of the dynamic magnetic gap 17, which is a very small magnetic gap. The electromagnetic force of the known electromagnet is inversely proportional to the square of the distance. In the case of a small magnetic gap, the coil of the lower electromagnet 3a will generate a relatively large electromagnetic force when it is energized, which will attract the lower armature hook 4a on the right side to the short magnetic pole on the right side of the lower electromagnet 3a, that is, the closed magnetic circuit position, and the first spring 5a on the right side is compressed at this time. As long as the suction force of the lower electromagnet 3a on the right side is greater than the elastic force of the first spring 5a on the right side, when the first vertical hook 6a on the right side moves down, even without the effect of the convex edge on the first vertical hook 6a on the right side, the lower armature hook 4a on the right side will be maintained in this closed magnetic circuit position by electromagnetic force. When the first vertical hook 6a on the right side continues to move downward until its hook tip is opposite to the hook tip of the lower armature hook 4a on the right side, due to the existence of the unhooking margin, the first vertical hook 6a on the right side can be smoothly moved downward to the bottom of the lower armature hook 4a on the right side, thereby achieving reliable unhooking. This is actually a new unhooking technology, which uses the unhooking margin parameters in the design stage to ensure the reliability of operation under complex working conditions.

[0095] It is very important to limit the dynamic magnetic gap 17 to a relatively small range, such as 0 to 0.3 mm. This is the key to the present invention and is also a tolerance margin issue. In the case of a small magnetic gap, the electromagnet coil can generate sufficient attraction with less power consumption to attract the armature hook to the magnetic pole and maintain this state. It is not impossible to limit the dynamic magnetic gap 17 to 0.4 mm, but a simple calculation shows that the electromagnet needs about 80% more electromagnetic force, which is obviously not conducive to low-power design. Of course, the power consumption is lower when the dynamic magnetic gap 17 is set to 0.2 mm, but this value also has the function of offsetting the processing errors, assembly errors, and deformation errors of various parts during operation. Therefore, setting the dynamic magnetic gap to 0.2 mm means that the precision requirements for the parts are higher, which increases the cost.

[0096] Figure 2The left side of the figure is in a hooking state, and the lower armature hook 4a on the left side is pushed by the first spring 5a on the left side to the short magnetic pole position away from the left side of the lower electromagnet 3a, and the first vertical hook 6a on the left side is hooked, forming a relatively large static magnetic gap 18. The lateral displacement of the lower armature hook 4a on the left side is actually a rotation around the corresponding rotating shaft. In this embodiment, the rotating shaft is located below the lower electromagnet 3a. The A-surface guide rails on both sides of the substrate 1 are engaged with the convex edges on the two first vertical hooks 6a rod bodies to ensure that the first vertical hooks 6a have no lateral displacement when moving up and down.

[0097] Figure 3 This is a schematic diagram of the installation diagram of the B side of the present invention, and it can be clearly seen that Figure 3 The right side is in the unhooked state, the second vertical hook 6b on the right side pushes the upper armature hook 4b on the right side to the short magnetic pole end of the upper electromagnet 3b, which is in the dynamic magnetic gap position, and the second spring 5b on the right side is compressed. At this time, the coil of the upper electromagnet 3b is energized, and the suction force of the upper electromagnet 3b is greater than the elastic force of the second spring 5b on the right side. The upper armature hook 4b on the right side will be sucked into the closed magnetic circuit position and maintained at this position. If the second vertical hook 6b on the right side moves downward, unhooking can be achieved.

[0098] Figure 3 The left side is in the hook state. The upper armature hook 4b on the left side moves in the direction away from the short magnetic pole of the upper electromagnet 3b under the action of the second spring 5b on the left side, to the static magnetic gap 18 position, and is in the hook state with the second vertical hook 6b on the left side. It can be seen that the shape of the upper armature hook 4b is different from that of the lower armature hook 4a, but the shape of the second vertical hook 6b is the same as that of the first vertical hook 6a. This design is very useful in high-density needle selectors that require two electromagnets stacked up and down. In such occasions, traditional technology can only use a long vertical hook (applicable to the upper armature hook) and a short vertical hook (applicable to the lower armature hook) in combination. The structural difference between the long and short vertical hooks will cause action differences.

[0099] See also Figure 2-Figure 3 As shown, the surface of the substrate 1 is provided with a limiting protrusion for preventing the armature hook from excessively moving outward laterally under the action of the spring, and the limiting protrusion does not interfere with the movement of the vertical hook in the vertical hook guide rail.

[0100] See also Fig. 9As shown, a printed circuit board slot 10 is provided at the top of the electromagnet skeleton 9, and metal spring sheets 11 for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot 10. Coil lead grooves 12, first spring mounting holes 13 and second spring mounting holes 14 are provided on the left and right sides of the electromagnet skeleton 9. The first spring 5a and the second spring 5b are fixed to corresponding points on the left and right sides of the electromagnet skeleton 9 through the first spring mounting holes 13 and the second spring mounting holes 14, respectively.

[0101] See also Fig.10 As shown, a heat sink 15 for dissipating heat for the dual electromagnet coil and having an electromagnetic shielding function is disposed on the top of the spacer 2. The heat sink 15 is made of non-magnetic metal material, and at least one surface of the heat sink 15 is exposed to the outside and in good contact with the metal body to conduct heat and electricity to the outside. After assembly, the heat sink 15 is in close contact with the coils of the upper electromagnet 3b and the lower electromagnet 3a. If multiple high-density needle selection device units are stacked, the heat sinks 15 of two adjacent high-density needle selection device units should be in good contact with each other to maintain heat and electricity conduction.

[0102] The electromagnet coil of the needle selection device is a heating element. During long-term continuous operation, the temperature at the center of the coil is very high, and may even damage the insulation layer of the enameled wire, causing the coil to short-circuit and burn. Currently, most coils are plastic-packaged, which has poor thermal conductivity, and multiple coils are densely installed, which is not conducive to heat dissipation. The heat sink provided in the present invention is in close contact with the coil to conduct heat. The heat sink is made of non-magnetic materials with good thermal and electrical conductivity, such as copper, aluminum or their alloy materials. While conducting heat, it can provide both magnetic and electrical shielding, thereby playing a role in resisting electromagnetic interference.

[0103] The present invention installs the lower electromagnet 3a, the upper electromagnet 3b, the first vertical hook guide, the second vertical hook guide, the first vertical hook 6a, the second vertical hook 6b, the first thin pulley block 7a, the second thin pulley block 7b, the lower armature hook 4a, the upper armature hook 4b, the first spring 5a and the second spring 5b on a block substrate 1 to form a unit, thereby realizing the accommodation of two sets of double-position double-action jacquard needle selection devices in one unit.

[0104] The high-density needle selection device of the present invention does not reduce the number of parts, but arranges the space reasonably, the relative position of the parts is more compact, and the precision requirement is correspondingly improved. In the design of the electromagnet, the suction force of the electromagnet is basically positively correlated with the volume. Therefore, to ensure the suction force of the electromagnet, the space of the electromagnet must be ensured. The present invention adopts a double electromagnet stacked up and down, which actually maintains the volume of a single electromagnet, thereby ensuring that the electromagnet has sufficient suction. The electromagnet skeleton is to relatively fix the position relationship of the electromagnet magnetic poles, facilitate production and assembly, ensure precision, and is a quality guarantee for mass production.

[0105] Based on a high-density needle selection device based on a thin pulley block disclosed in an embodiment of the present invention, see Fig.11 As shown, the present invention can also be made into a 16-needle high-density needle selection device assembly formed by stacking 8 high-density needle selection devices based on thin pulley groups disclosed above. When stacking, they can be stacked alternately in the form of the spacer in front and the base sheet in the back, or in the form of the base sheet in front and the spacer in the back.

[0106] It should be noted that the technical solution of the present invention is not limited to the production of 16-needle high-density needle selection device components, but can also produce needle selection device components with higher density. Based on this, the present invention can also be further made into an electronic jacquard machine equipped with the high-density needle selection device component disclosed above.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-density needle selection device based on a thin pulley group, characterized in that: The invention comprises a base plate (1) and a spacer (2), wherein the spacer (2) is arranged on the front side or the rear side of the base plate (1), and the front and rear sides of the base plate (1) are provided with a pulley block slide groove located in the middle and full-range linear vertical hook guide rails located on the left and right sides; a pair of vertical hooks with the same structure are respectively arranged in the vertical hook guide rails on the front and rear sides of the base plate (1); a group of thin pulley blocks with the same structure are respectively arranged in the pulley block slide grooves on the front and rear sides of the base plate (1), and the two pairs of vertical hooks respectively drive a corresponding group of thin pulley blocks through upper pulley lines to slide up and down; The top of the substrate (1) is provided with two electromagnets stacked up and down through an electromagnet frame (9), and the two electromagnets each have two intersecting magnetic pole surfaces; a pair of armature hooks for cooperating with a pair of vertical hooks on the same side are respectively provided on the left and right sides of the two electromagnets, and the two pairs of armature hooks are designed differently and are respectively located on the inner side of the pair of vertical hooks on the same side; the shaft hole portions of the two pairs of armature hooks are respectively rotatably connected to the front and rear sides of the substrate (1) through a pair of rotating shafts arranged on the substrate (1); the rear side surfaces of the hook tips of the two pairs of armature hooks are respectively elastically connected to the left and right sides of the electromagnet frame (9) through a pair of springs; the intersecting magnetic pole surfaces of the two electromagnets respectively cooperate with the two side surfaces of the corresponding pair of armature hooks to form a closed magnetic circuit; the two pairs of rotating shafts are respectively located outside the two closed magnetic circuits, and the hook tips and magnetic pole portions of the armature hooks are both on the same side of the rotating shaft.

2. The high-density needle selection device based on a thin pulley block according to claim 1, characterized in that: The structures on the front and rear surfaces of the substrate (1) are respectively the A surface and the B surface, and the pulley block slide groove and the vertical hook guide rail located on the front side of the substrate (1) are respectively the A surface pulley block slide groove and the A surface vertical hook guide rail, and the pulley block slide groove and the vertical hook guide rail located on the rear side of the substrate (1) are respectively the B surface pulley block slide groove and the B surface vertical hook guide rail; the two pairs of vertical hooks are respectively a pair of first vertical hooks (6a) and a pair of second vertical hooks (6b) with the same structure; the two thin pulley blocks are respectively The two electromagnets stacked up and down are respectively an upper electromagnet (3b) and a lower electromagnet (3a) with symmetrical structures; the two pairs of armature hooks are respectively a lower armature hook (4a) and an upper armature hook (4b) with different structures; the two pairs of springs are respectively a pair of first springs (5a) and a pair of second springs (5b) with the same structure; the two pairs of rotating shafts are respectively a first rotating shaft (8a) and a second rotating shaft (8b) with the same structure; The specific structure of the A surface is that a pair of the first vertical hooks (6a) are respectively slidably arranged in the vertical hook guide rails of the A surface on the left and right sides, and the first thin pulley block (7a) is slidably arranged in the A surface pulley block slide groove, and the pair of the first vertical hooks (6a) are connected to the two ends of the upper pulley line of the first thin pulley block (7a), and the two ends of the lower pulley line of the first thin pulley block (7a) are respectively fixed and connected to the first head line joint (16a); the first vertical hooks (6a) are arranged on the vertical hook guide rails on both sides of the A surface. The first thin pulley block (7a) is driven to rise and fall in the pulley block slot on the A surface as the knife is lifted up and down in the rail; the lower electromagnet (3a) is fixedly mounted at the lower end of the electromagnet frame (9); a pair of lower armature hooks (4a) are respectively located on the left and right sides of the lower electromagnet (3a), and the pair of lower armature hooks (4a) are located on the inner side of the pair of first vertical hooks (6a); the axial holes of the pair of lower armature hooks (4a) are connected to the corresponding points on the front side of the substrate (1) through the corresponding pair of first rotating shafts (8a). The rear side surfaces of the hook tips of a pair of lower armature hooks (4a) are elastically connected to corresponding points on the left and right sides of the lower part of the electromagnet skeleton (9) through a pair of first springs (5a), and the intersecting magnetic pole surfaces of the lower electromagnet (3a) cooperate with the two side surfaces of a pair of lower armature hooks (4a) to form a corresponding A-surface closed magnetic circuit, and the two first rotating shafts (8a) are both located outside the A-surface closed magnetic circuit, and the hook tips and magnetic poles of the lower armature hooks (4a) are both on the first rotating shaft (8a). on the same side; when the lower electromagnet (3a) is energized, the lower armature hook (4a) is maintained at the closed magnetic circuit position on the A surface, and the hook tip of the lower armature hook (4a) does not contact the hook tip of the first vertical hook (6a), and is in a decoupled state; when the lower electromagnet (3a) is not energized, the lower armature hook (4a) moves in a direction away from the magnetic pole of the lower electromagnet (3a) under the action of the first spring (5a), and the hook tip of the lower armature hook (4a) hooks the hook tip of the first vertical hook (6a) in a lifting manner, and is in a hooked state; The specific structure of the B surface is that a pair of the second vertical hooks (6b) are respectively slidably arranged in the vertical hook guide rails of the B surface on the left and right sides, and the second thin pulley block (7b) is slidably arranged in the pulley block slide groove of the B surface, a pair of the second vertical hooks (6b) are connected to the upper pulley line of the second thin pulley block (7b), and the two ends of the lower pulley line of the second thin pulley block (7b) are respectively fixed and connected to the second head line joint (16b); the second vertical hooks (6b) are arranged in the vertical hook guide rails on both sides of the B surface. The lifting of the knife drives the second thin pulley group (7b) to rise and fall in the pulley group slot on the B surface; the upper electromagnet (3b) is fixedly mounted on the upper end of the electromagnet frame (9); a pair of upper armature hooks (4b) are respectively located on the left and right sides of the upper electromagnet (3b), and the pair of upper armature hooks (4b) are located on the inner side of the pair of second vertical hooks (6b); the axial holes of the pair of upper armature hooks (4b) are rotated with the corresponding points on the rear side of the substrate (1) through the corresponding pair of second rotating shafts (8b). The rear side surfaces of the hook tips of a pair of upper armature hooks (4b) are elastically connected to corresponding points on the left and right sides of the upper part of the electromagnet skeleton (9) through a pair of second springs (5b), and the intersecting magnetic pole surfaces of the upper electromagnet (3b) cooperate with the two side surfaces of a pair of upper armature hooks (4b) to form a corresponding B-side closed magnetic circuit, and the two second rotating shafts (8b) are both located outside the B-side closed magnetic circuit, and the hook tips and magnetic poles of the upper armature hooks (4b) are both on the second rotating shaft (8b). on the same side; when the upper electromagnet (3b) is energized, the upper armature hook (4b) is maintained at the closed magnetic circuit position on the B surface, and the hook tip of the upper armature hook (4b) does not contact the hook tip of the second vertical hook (6b), and is in a decoupled state; when the upper electromagnet (3b) is not energized, the upper armature hook (4b) moves in a direction away from the magnetic pole of the upper electromagnet (3b) under the action of the second spring (5b), and the hook tip of the upper armature hook (4b) hooks the hook tip of the second vertical hook (6b) in a pulling manner, and is in a hooked state.

3. The high-density needle selection device based on a thin pulley block according to claim 2, characterized in that: The thin pulley set includes two vertical plates (701), two upper horizontal plates (702), two middle horizontal plates (703), two lower horizontal plates (704) and two thin pulleys (705); after the two upper horizontal plates (702) are joined together face to face, an upper fixing plate is formed, after the two middle horizontal plates (703) are joined together face to face, a middle fixing plate is formed, and after the two lower horizontal plates (704) are joined together face to face, a lower fixing plate is formed; the upper fixing plate, the middle fixing plate and the lower fixing plate form a "king"-shaped bracket under the front and rear clamping of the two vertical plates (701); there is a pulley installation gap between the two vertical plates (701) under the support of the upper fixing plate, the middle fixing plate and the lower fixing plate, and the pulley installation gap forms an upper pulley installation gap position and a lower pulley installation gap position in the area between the upper fixing plate and the middle fixing plate and in the area between the middle fixing plate and the lower fixing plate respectively; The two thin pulleys (705) are respectively rotatably installed in the upper pulley installation gap position and the lower pulley installation gap position through corresponding sliding bearing assemblies; The width of the vertical plate (701) is smaller than the diameter of the thin pulley (705), and a buffer and shock absorption structure (706) is arranged in the middle of the vertical plate (701) by grooving; the width of the middle horizontal plate (703) is slightly larger than the diameter of the thin pulley (705), and the thicknesses of the left and right ends of the middle horizontal plate (703) are the same to serve as positioning sliders (707) when the thin pulley set moves in the pulley set chute; the widths of the upper horizontal plate (702) and the lower horizontal plate (704) are equal, and the widths of the upper horizontal plate (702) and the lower horizontal plate (704) are both smaller than the width of the middle horizontal plate (703) and larger than the width of the vertical plate (701).

4. The high-density needle selection device based on a thin pulley block according to claim 3 is characterized in that: The sliding bearing assembly includes a journal (713) and a bushing (714), the journal (713) is arranged on the axis of the thin pulley (705), and the bushings (714) are respectively arranged on the front and rear vertical plates (701); the journal (713) and the bushing (714) are made of metal materials with similar hardness, wherein the hardness rate of the bushing (714) is greater than the hardness of the journal (713); an oil storage groove (715) is formed on the journal (713), and a sealing cover (708) for covering the oil storage groove is arranged on the outer periphery of the bushing (714).

5. The high-density needle selection device based on a thin pulley block according to claim 2, characterized in that: The vertical hook comprises a rod-shaped body (601), a side ear portion (602) for hooking with the blade of a knife is arranged in the middle of the outer side of the rod-shaped body (601), a top hook portion (603) is arranged at the top end of the inner side of the rod-shaped body (601), and the hook tip of the top hook portion (603) is close to the inner edge of the rod-shaped body (601), and the hook bottom of the top hook portion (603) is close to the axis of the rod-shaped body (601); a convex edge for laterally pushing the armature hook on the corresponding side and keeping it in position is arranged at the upper edge of the inner side of the rod-shaped body (601) and below the top hook portion (603), and the convex edge protrudes laterally from the hook tip of the top hook portion (603); the contour curve of the convex edge is divided into a pushing section (604a) located in the upper section and a holding section (604b) located in the lower section, and the pushing section (604a) is provided with a protruding edge. ) is an inclined curve starting from the bottom of the hook of the top hook portion (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 with the holding section (604b); the distance from the bottom of the holding section (604b) to the bottom of the hook of the top hook portion (603) is greater than the distance from the hook tip of the top hook portion (603) to the bottom of the hook of the top hook portion (603); the length of the holding section (604b) of the convex edge corresponds to the tolerance range of the jacquard machine knife lifting height allowed by the needle selection device to which it belongs; a section of limiting convex edge (605) is provided along the edge of the middle and lower parts of the inner side of the rod-shaped body (601) for engaging with the vertical hook guide rail and ensuring that the vertical hook does not produce lateral displacement, and the top end of the limiting convex edge (605) is connected to the bottom end of the convex edge holding section (604b) in a parallel straight line.

6. The high-density needle selection device based on a thin pulley block according to claim 5, characterized in that: At least one shock-absorbing groove (606) for isolating vibration caused by lifting the knife is provided between the side ear portion (602) and the rod-shaped body (601).

7. The high-density needle selection device based on a thin pulley block according to claim 2, characterized in that: The armature hook comprises a straight rod portion (401), a magnetic pole surface sliding contact portion (404), a magnetic pole surface suction contact portion (405), an axial hole portion (402), a hook tip portion (403) and a spring positioning column (406); the cross section of the straight rod portion (401) is rectangular; the axial hole portion (402) is arranged at one end of the straight rod portion (401) through the magnetic pole surface sliding contact portion (404); the hook tip portion (403) is arranged at the other end of the straight rod portion (401) through the magnetic pole surface suction contact portion (405); and the spring positioning column (406) is arranged 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); a cross beam at one end of the I-shaped iron core (301) is a long magnetic pole (302), and a cross beam at the other end of the I-shaped iron core (301) is a short magnetic pole (303); the left and right ends of the long magnetic pole (302) have a first bending portion bent backwards, and the left and right ends of the short magnetic pole (303) have a second bending portion bent forwards, the first bending portion and the second bending portion are in a front-to-back misalignment, and the misalignment amplitude is equal to the thickness of the straight rod portion (401); the concave surface of the first bending portion serves as a sliding magnetic pole The second bending portion is provided with a side end surface as an attraction magnetic pole surface (305), and the sliding magnetic pole surface (304) and the attraction magnetic pole surface (305) located on the same side constitute two intersecting magnetic pole surfaces; a magnetic conductive plastic upper cover (306) is arranged in front of the sliding magnetic pole surface (304), and there is a distance between the magnetic conductive plastic upper cover (306) and the sliding magnetic pole surface (304) to form a groove for facilitating the embedding of the straight rod portion (401), and a magnetic conductive elastic member (307) for contacting the straight rod portion (401) is arranged in the groove; After assembly, the shaft hole portion (402) is rotatably mounted on the rotating shaft, one end of the spring is fixed on the spring positioning column (406), and the other end of the spring is fixedly connected to a corresponding point on the side wall of the electromagnet skeleton (9); the magnetic pole surface sliding contact portion (404) is tightly embedded in a groove formed by the sliding magnetic pole surface (304), the magnetic conductive plastic upper cover (306) and the magnetic conductive elastic member (307), and the magnetic pole surface suction contact portion (405) is laterally aligned with the suction magnetic pole surface (305); when the magnetic pole surface suction contact portion (405) contacts the suction magnetic pole surface (305), the magnetic pole surface suction contact portion (405) is in contact with the suction magnetic pole surface (305). In this case, the three sides of the magnetic pole surface sliding contact portion (404) are respectively in contact with the sliding magnetic pole surface (304), the magnetic plastic upper cover (306) and the magnetic elastic member (307), so that the sliding magnetic pole surface (304), the magnetic pole surface sliding contact portion (404), the straight rod portion (401), the magnetic pole surface suction contact portion (405) and the suction 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 matching points of the two pairs of the armature hooks and the corresponding pair of the vertical hooks are at the same position height.

8. The high-density needle selection device according to claim 1, characterized in that: A printed circuit board slot (10) is provided at the top of the electromagnet frame (9), metal spring sheets (11) for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot (10), and coil lead grooves (12), a first spring mounting hole (13) and a second spring mounting hole (14) are provided on both left and right sides of the electromagnet frame (9).

9. The high-density needle selection device according to claim 1, characterized in that: A heat sink (15) is arranged on the top of the spacer (2) for dissipating heat for the coil of the electromagnet and also having an electromagnetic shielding function. The heat sink (15) is made of a non-magnetic metal material, and at least one surface of the heat sink (15) is exposed to the outside and in good contact with the metal body to conduct heat and electricity to the outside.

10. A high-density needle selection device assembly, characterized in that: A 16-needle high-density needle selection device assembly is formed by stacking 8 high-density needle selection devices based on a thin pulley group as described in any one of claims 1 to 9.

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