Low-power-consumption high-reliability needle selection device and jacquard assembly and jacquard machine thereof

Abstract

The low-power-consumption high-reliability needle selection device comprises a substrate, vertical hook guide rails are arranged on the two sides of the substrate, a pulley block sliding groove is formed in the middle of the substrate, an electromagnet is arranged on the upper portion of the substrate, armature hooks are arranged on the two sides of the electromagnet, and a closed magnetic circuit is formed after straight rod parts of the armature hooks are matched with two magnetic poles of the electromagnet; a vertical hook is arranged in the vertical hook guide rail of the substrate, and a harness cord pulley block is arranged in the pulley block chute; and a convex edge is arranged below the hook tip part of the vertical hook. According to the semi-active needle selection device, the magnetic pole end of the armature hook can move among the static magnetic gap position, the dynamic magnetic gap position and the closed magnetic circuit position, meanwhile, the design of the whole-course linear vertical hook guide rail and the vertical hook protruding edge is adopted, a new hook unhooking technology is formed, a large hook can be designed for reliable load bearing, and a user does not need to worry about unhooking difficulty of the large hook; the structure is compact, the power consumption is low, the transverse displacement precision of the armature hook is high, and the action reliability under the complex working condition can be guaranteed through sufficient design allowance.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic jacquard machines of textile machinery, and in particular relates to a low-power and high-reliability needle selection device and a jacquard assembly and a jacquard machine equipped with the needle selection device. 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 physical movement of the rise / fall of the warp yarn. The working principle of the needle selection device is already a prior art, similar to the principle of an electromagnetic relay. It is a monostable device, that is, when the coil is not energized, there is no electromagnetic force, and the armature is in position 1 (steady state) under the action of the reset spring; when the coil is energized, an electromagnetic force is generated to attract the armature, and the armature is in position 2 (temporary steady state). In the needle selection device, one end of the armature is made into a hook shape, so it is called an armature hook. In addition, there is a vertical hook in the needle selection device that can move up and down with the jacquard machine knife, and the hook part of the vertical hook can be hooked with the hook part of the armature hook. In actual work, when the vertical hook is unhooked from the armature hook ("unhooked" state), the vertical hook moves with the knife under the action of the wire spring; when the vertical hook is hooked on the armature hook ("hook" state), the vertical hook is separated from the knife and does not move with the knife. The tension of the wire spring acts on the frame (armature hook-shaft-substrate-needle box-frame) through the armature hook. It can usually be designed that position 1 (stable state) is the "hook" state, and position 2 (temporary steady state) is the "unhooked" state, or vice versa. Since the vertical hook connects the wire 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. Jacquard machines are single-acting and double-acting. The double-acting mechanism is complex. One jacquard needle (first thread) corresponds to two vertical hooks, and the two vertical hooks are converted to the rise and fall of one jacquard needle (first thread) through a pulley block. The double-acting jacquard machine has little damage to the warp yarn, which is beneficial to weaving. At present, most electronic jacquard machines are double-acting. The needle selection device produced in large quantities commercially usually combines 8 (or multiples of 8) electromagnets and corresponding mechanisms into an assembly, called a component, to facilitate installation and maintenance.

[0003] Since the jacquard machine has thousands or tens of thousands of needles working at the same time, there are thousands or tens of thousands of needle selection devices working at the same time, which brings two important problems: one is the problem of action reliability, and the other is the problem of power consumption. For example, a needle selection device with position 1 in the "hanging" state and position 2 in the "taking off" state may fail to take off when changing from the "hanging" state to the "taking off" state, resulting in "skipped needles" during weaving. This is a manifestation of low action reliability. In addition, the needle selection devices are mostly densely installed, and the coil power consumption of the electromagnet is large, which is bound to cause high heat generation. After long-term operation, the temperature rise of the needle selection device will cause deformation of mechanical parts and affect the action reliability. At the same time, high power consumption places higher requirements on the system power supply and drive circuit, and will also increase the failure rate of the power supply and drive circuit.

[0004] The problem of the reliability of the needle selection device is often manifested as the "tolerance margin" for various external factors, such as voltage, temperature, vibration, friction resistance of moving parts, electromagnetic interference, different knife lifting heights, knife lifting deformation, parts manufacturing errors in mass production, wear and deformation after long-term continuous work, etc. The operation reliability of the needle selection device with high tolerance margins for various external factors must be high, while the needle selection device with low tolerance margins for various external factors is often prone to random failures during field use. The problem of designing a high-reliability needle selection device actually turns into the problem of improving the tolerance margin of the needle selection device for various external factors.

[0005] From the design of the electromagnet, low power consumption means small coil current. When the number of coil turns remains unchanged, a smaller coil current will inevitably produce a smaller electromagnetic force. From the perspective of action reliability, a larger electromagnetic force can often better ensure the reliability of action switching. Therefore, there is a contradiction between low power consumption and high reliability. In addition, the magnetic gap between the electromagnet and the armature is also a problem. The armature is made into a hook shape in the needle selection device, which is called an armature hook. If the magnetic gap is large, the armature hook has a large range of motion in the hook part, the hook depth can be relatively large, and the "hanging" state and the "unhooking" state are distinct, which is conducive to the reliability of physical actions. However, if the magnetic gap is large, the magnetic resistance is large. Under the same current, the electromagnetic force of the electromagnet becomes smaller, and a larger coil power is required to complete the same action. This is also a contradiction between high reliability of action and low power consumption. Summary of the invention

[0006] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a low-power and high-reliability needle selection device, and a jacquard assembly and a jacquard machine equipped with the needle selection device.

[0007] In order to solve the above technical problems and achieve the above technical effects, the present invention is implemented through the following technical solutions:

[0008] A low-power and high-reliability needle selection device comprises a substrate, both sides of which are provided with full-range linear vertical hook guide rails, the middle part of the substrate is provided with a pulley block slide groove, the upper part of the substrate is provided with an electromagnet through an electromagnet frame, an armature hook is respectively provided on the left and right sides of the electromagnet, the axial hole parts of the two armature hooks are respectively rotatably connected to the substrate through corresponding rotating shafts, the inner sides of the hook tips of the two armature hooks are respectively elastically connected to the left and right sides of the electromagnet frame through corresponding springs, and the straight rod part of the armature hook cooperates with the two magnetic poles of the electromagnet to form a closed magnetic circuit; a vertical hook for cooperating with the armature hook on the corresponding side is respectively provided in the vertical hook guide rails on both sides of the substrate A wire pulley group is arranged in the pulley group slide groove of the substrate, and the two vertical hooks drive the wire pulley group to slide up and down through the upper pulley line; a convex edge is arranged below the hook tip of the two vertical hooks for laterally pushing and holding the armature hook on the corresponding side, and when the vertical hook goes up, the convex edge pushes the armature hook on the same side to rotate around the corresponding rotating shaft, and the magnetic pole portion of the armature hook moves from a static magnetic gap position away from the electromagnet magnetic pole to a direction close to the electromagnet magnetic pole, and the magnetic pole portion of the armature hook is stopped at a dynamic magnetic gap position close to the electromagnet magnetic pole by the convex edge, and at this time, the coil of the electromagnet is energized to attract the armature hook to the closed magnetic circuit position.

[0009] Furthermore, the vertical hook includes a rod-shaped body, a side ear portion for hooking with a lifting knife is provided in the middle of one side of the rod-shaped body, the hook tip portion is provided at the top end of the other side of the rod-shaped body, and the hook tip of the hook tip portion is close to the edge of the other side of the rod-shaped body, and the hook bottom of the hook tip portion is close to the axis of the rod-shaped body, the convex edge is provided at the upper edge of the other side of the rod-shaped body, and the convex edge is higher than the hook tip of the hook tip portion, and 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, the pushing section is an inclined curve starting from the hook bottom of the hook tip portion, and the holding section is a straight line parallel to the moving direction of the rod-shaped body, the pushing section is smoothly connected with the holding section, and in the initial stage of the vertical hook upward process, the pushing section can generate an outward lateral thrust to the armature hook in contact with it, and in the middle and late stages of the vertical hook upward process, the holding section can apply a holding force to the armature hook that has generated a lateral displacement.

[0010] Furthermore, the distance from the bottom of the retaining section to the bottom of the hook tip portion is greater than the distance from the hook tip of the hook tip portion to the bottom of the hook tip portion.

[0011] Furthermore, the length of the retaining 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, and within the tolerance range, the armature hook in contact with the convex edge remains in the dynamic magnetic gap position.

[0012] Furthermore, the dynamic magnetic gap 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 is 0 to 0.3 mm.

[0013] Furthermore, a limiting convex edge is provided along the edge of the middle and lower part of the other side of the rod-shaped body for engaging with the vertical hook guide rails on both sides of the substrate 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 retaining section in a parallel straight line.

[0014] 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.

[0015] Furthermore, a limiting protrusion is disposed on the surface of the substrate 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.

[0016] The present invention also discloses a jacquard assembly, and the jacquard assembly cooperates with the low-power consumption and high-reliability needle selection device disclosed above.

[0017] The present invention also discloses a jacquard machine, which is equipped with the low-power consumption and high-reliability needle selection device disclosed above, or is equipped with the jacquard assembly disclosed above.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The magnetic pole of the armature hook of the present invention moves in three positions. The static magnetic gap position is the "hanging" state position, which is farthest from the magnetic pole of the electromagnet; the dynamic magnetic gap position is a position very close to the magnetic pole of the electromagnet. The lateral displacement generated by the vertical hook convex edge realizes the movement of the armature hook from the static magnetic gap position to the dynamic magnetic gap position; in the dynamic magnetic gap position, since the magnetic gap is small, the magnetic resistance is small, and the coil can generate a large electromagnetic force with a small power supply, attracting the armature hook to the closed magnetic circuit position, that is, the "off" state position. The dynamic magnetic gap is set to a range of 0 to 0.3 mm. This range can offset the errors in part processing and assembly, as well as the deformation errors that may occur during use. This is a tolerance margin.

[0020] 2. The full-length linear vertical hook guide rail and vertical hook flange design of the present invention constitute a new hook unhooking technology, which can design a larger hook to reliably bear the load, so there is no need to worry about the difficulty of unhooking the large hook. Sufficient design margin can ensure the reliability of operation under complex working conditions.

[0021] 3. The full-range linear vertical hook guide rail on the substrate of the present invention cooperates with the limiting convex edge on the vertical hook 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 the aforementioned 0-0.3mm dynamic magnetic gap range can be achieved.

[0022] 3. The distance from the retaining section of the vertical hook convex edge to the hook bottom of the present invention 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 decoupling margin, which is also a tolerance margin, which can prevent malfunction and improve reliability.

[0023] 4. The present invention uses a convex retaining section to enable the knife lifting device to reach the vertical hook switching height (switching from hanging to taking off) required by the needle selection device within a wider range, and has a wide knife lifting height tolerance range (tolerance margin), which reduces the manufacturing difficulty of the jacquard machine host and improves the reliability of the entire machine operation.

[0024] 5. The vertical hook of the present invention 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, thereby improving the reliability of the action.

[0025] 6. The present invention has low power consumption of the coil, so in addition to energy saving, the coil temperature rise is low, the mechanical deformation of the parts of the needle selection device caused by the temperature rise is reduced, the tolerance margin to the ambient temperature is increased, and the operation reliability is improved.

[0026] 7. The electromagnet coil of the present invention has low power consumption, reduces the load of the driving circuit, increases the tolerance margin to the power supply voltage, and improves the reliability of the jacquard machine control system and the power supply system.

[0027] 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

[0028] 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:

[0029] Figure 1 It is a schematic diagram of the installation of an embodiment of the needle selection device of the present invention;

[0030] Figure 2 It is a schematic diagram of the installation of another embodiment of the needle selection device of the present invention;

[0031] Figure 3 for Figure 2A side view of the matching relationship between the rod-shaped body of the middle vertical hook and the limiting convex edge and the vertical hook guide rail;

[0032] Figure 4 It is a structural diagram of an embodiment of a vertical hook in the needle selection device of the present invention;

[0033] Figure 5 It is a structural diagram of another embodiment of a vertical hook in the needle selection device of the present invention;

[0034] Figure 6 Schematic diagram of the Stäubli M4 / M5 module substrate. DETAILED DESCRIPTION

[0035] 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.

[0036] As an improvement on the prior art, the present invention needs to explain the prior art. Figure 6 As shown) as an example:

[0037] 1. There is no full-range linear guide for the vertical hook lifting, and the upper part of the guide is intentionally bent; Figure 6 B in the middle 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 decoupling posture.

[0038] 2. There is no convex edge with a fixed height, but a molded elastic part is provided; if the elastic part is pressed for a long time during operation (for example, when the knife is fully raised), it will cause plastic deformation and lose elasticity and function; the Chinese utility model patent application "A metal vertical hook for a textile electronic jacquard machine assembly", patent number ZL200720029284.2, is an improvement on this molded elastic part;

[0039] 3. There is no retaining section of the convex edge, so the "tool lifting tolerance" performance is poor;

[0040] 4. There is no 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 existence of the elastic part, the distance between the hook tip of the vertical hook and the hook tip of the armature hook is uncertain.

[0041] 5. There is no "dynamic magnetic gap" design. In fact, its working principle is to move directly from the static magnetic gap to the closed magnetic gap. The design of the curved guide rail and the elastic parts are designed to press the armature hook as much as possible to the magnetic pole of the electromagnet. However, due to factors such as vibration during operation, it will cause uncertainty.

[0042] See also Figure 1-3 As shown, the present invention provides a low-power and high-reliability needle selection device, comprising a substrate 1, both sides of the substrate 1 are provided with full-range linear vertical hook guide rails 10, the middle part of the substrate 1 is provided with a pulley block slide groove, the upper part of the substrate 1 is provided with an electromagnet 3 through an electromagnet skeleton 2, and the left and right sides of the electromagnet 3 are respectively provided with an armature hook 4, the axial hole parts of the two armature hooks 4 are respectively rotatably connected to the substrate 1 through corresponding rotating shafts 5, the inner sides of the hook tips of the two armature hooks 4 are respectively elastically connected to the left and right sides of the electromagnet skeleton 2 through corresponding springs 6, and the straight rod part of the armature hook 4 cooperates with the two magnetic poles of the electromagnet 3 to form a closed magnetic circuit; a vertical spring for cooperating with the armature hook 4 on the corresponding side is respectively provided in the vertical hook guide rails 10 on both sides of the substrate 1 Hook 7, a wire pulley group is arranged in the pulley group slide groove of the substrate 1, and the two vertical hooks 7 drive the wire pulley group to slide up and down through the upper pulley line; a convex edge 702 is arranged below the hook tip 701 of the two vertical hooks 7 for laterally pushing and holding the armature hook 4 on the corresponding side. When the vertical hook 7 goes up, the convex edge 702 pushes the armature hook 4 on the same side to rotate around the corresponding rotating shaft 5, and the magnetic pole portion of the armature hook 4 moves from the static magnetic gap 8 position away from the magnetic pole of the electromagnet 3 to the direction close to the magnetic pole of the electromagnet 3, and the magnetic pole portion of the armature hook 4 is stopped at the dynamic magnetic gap 9 position close to the magnetic pole of the electromagnet 3 through the convex edge 702. At this time, the coil of the electromagnet 3 is energized to attract the armature hook 4 to the closed magnetic circuit position.

[0043] See also Figure 4-5As shown, the vertical hook 7 includes a rod-shaped body 703, and a side ear portion 704 for hanging with a lifting knife is arranged in the middle of one side of the rod-shaped body 703. When working, the side ear portion 704 is directly hung on the blade of the lifting knife, and the lifting knife pulls the vertical hook 7 to move through the side ear portion 704. The top of the other side of the rod-shaped body 703 is provided with the hook tip portion 701, and the hook tip of the hook tip portion 701 is close to the edge of the other side of the rod-shaped body 703, and the hook bottom of the hook tip portion 701 is close to the axis of the rod-shaped body 703. The convex edge 702 is arranged on the upper edge of the other side of the rod-shaped body 703, and the convex edge 702 is higher than the hook tip portion The hook tip 701, the contour curve of the convex edge 702 is divided into a pushing section 702a located in the upper section and a retaining section 702b located in the lower section, the pushing section 702a is an inclined curve starting from the hook bottom of the hook tip 701, the retaining section 702b is a straight line parallel to the moving direction of the rod-shaped body 703, and the pushing section 702a is smoothly connected with the retaining section 702b; in the early stage of the upward process of the vertical hook 7, the pushing section 702a can generate an outward lateral thrust on the armature hook 4 in contact with it, and in the middle and late stages of the upward process of the vertical hook 7, the retaining section 702b can apply a retaining force to the armature hook 4 that has generated a lateral displacement.

[0044] The distance from the bottom of the retaining section 702b to the bottom of the hook tip 701 is greater than the distance from the hook tip of the hook tip 701 to the bottom of the hook of the hook tip 701; this distance difference is also the distance between the hook tip of the armature hook 4 and the hook tip of the vertical hook 7 in the unhooked state, so it is defined as the unhooking allowance, which is a tolerance margin; see Figure 4 As shown, Figure 4 A in the middle represents the unhooking margin. Due to the existence of the unhooking margin A, the hook tip of the armature hook 4 does not contact the hook tip of the vertical hook 7. Even if vibration or the like occurs, the hook tip of the vertical hook 7 will not catch the hook tip of the armature hook 4, thereby avoiding the failure of unhooking. The unhooking margin ensures the reliability of the unhooking action under complex working conditions.

[0045] The length of the retaining section 702b of the convex edge 702 corresponds to the tolerance range of the jacquard machine knife lifting height allowed by the needle selection device to which it belongs. Within this tolerance range, the armature hook 4 in contact with the convex edge 702 is retained in the dynamic magnetic gap 9. The retaining section 702b is actually a straight section. In this section of the retaining section 702b, the armature hook 4 in contact with it will not have a lateral displacement, but will be retained in the dynamic magnetic gap 9.

[0046] 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.

[0047] The dynamic magnetic gap 9 is the distance between the magnetic pole surface of the armature hook 4 and the magnetic pole surface of the electromagnet 3 under the action of the convex edge 702 , and the value range of the dynamic magnetic gap is 0 to 0.3 mm.

[0048] A section of limiting convex edge 705 is provided along the edge of the middle and lower part of the other side of the rod-shaped body 703 for engaging with the vertical hook guide rails 10 on both sides of the substrate 1 and ensuring that the vertical hook 7 does not produce lateral displacement, and the top of the limiting convex edge 705 is connected in a parallel straight line with the bottom end of the convex edge holding section 702b; since the vertical hook 7 is arranged in the vertical hook guide rail 10 of the substrate 1, the vertical hook 7 needs to have a rod-shaped body 703 cooperating therewith to ensure that the vertical hook 7 does not have lateral displacement when it moves up and down in the vertical hook guide rail 10; since the dynamic magnetic gap 9 is generated by the convex edge 702, it has certain accuracy requirements. Therefore, in order to ensure accuracy, it is necessary to ensure that the movement trajectory of the vertical hook 7 is stable, and when the vertical hook 7 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.

[0049] At least one damping groove 706 is provided between the side ear portion 704 and the rod-shaped body 703 to block the vibration of the knife lifting, so as to prevent the vibration of the knife lifting from being transmitted to the hook tip portion 701 through the side ear portion 704, thereby improving the reliability of the operation. The number of the damping grooves 706 can be designed according to the requirements, for example, it can be designed as follows: Figure 4 The single slot method shown can also be designed as Figure 5 The double slot method shown.

[0050] The surface of the substrate 1 is provided with a limiting protrusion for preventing the armature hook 4 from excessively moving outward laterally under the action of the spring 6 , and the limiting protrusion does not interfere with the movement of the vertical hook 7 in the vertical hook guide rail 10 .

[0051] Based on the above structure, the needle selection device of the present invention can form the following two main embodiments:

[0052] Example 1

[0053] See also Figure 1 As shown, in this embodiment, the rotating shaft 5 of the armature hook 4 is below the electromagnet 3. The vertical hook 7 is actually pressed on the armature hook 4, so the armature hook 4 must be rigid. Usually the armature hook 4 is made of soft iron material, and its rigidity can meet the pressure of the vertical hook 7.

[0054] from Figure 1 It can be clearly seen that the right side of the substrate 1 is in the "off" state, and the armature hook 4 on the right side is in the position where it is pushed to the right magnetic pole of the electromagnet 3 by the convex edge 702 of the vertical hook 7 on the right side, that is, the position of the dynamic magnetic gap 9, 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 electromagnet 3 coil will generate a relatively large electromagnetic force when it is energized, which will attract the armature hook 4 to the right magnetic pole of the electromagnet 3, that is, the closed magnetic circuit position, and the spring 6 on the right side is compressed at this time. As long as the suction force of the electromagnet 3 coil on the armature hook 4 is greater than the elastic force of the spring 6 when the vertical hook 7 on the right side moves down, even without the effect of the convex edge 702, the armature hook 4 will remain in this closed magnetic circuit position by the electromagnetic force. When the vertical hook 7 on the right side continues to move down to the point where the hook tip of the vertical hook 7 is opposite to the hook tip of the armature hook 4, due to the existence of the unhooking margin A, it is ensured that the vertical hook 7 on the right side can smoothly descend to the bottom of the armature hook 4 on the right side and be reliably unhooked. This is actually a new uncoupling technology, which uses the uncoupling margin parameters in the design phase to ensure the reliability of operation under complex working conditions.

[0055] Limiting the dynamic magnetic gap 9 to a relatively small range, such as 0 to 0.3 mm, is the key to this solution and is very important. It 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 overcome the resistance to movement, attract the armature hook to the magnetic pole, and maintain this state. It is not impossible to set the dynamic magnetic gap 9 to 0.4 mm, but a simple calculation shows that the electromagnet needs about 80% more electromagnetic force to ensure attraction, which is obviously not conducive to low-power design. Setting the dynamic magnetic gap 9 to 0.2 mm certainly requires lower power consumption, but this value also has the function of offsetting the processing errors, assembly errors, and deformation errors of various parts during operation. Setting it to 0.2 mm means that the precision requirements for the parts are higher, which increases the cost.

[0056] The left side of the substrate 1 is in a "hanging" state, and the armature hook 4 on the left is pushed by the spring 6 on the left to a position away from the left magnetic pole of the electromagnet 3, hooking the vertical hook 7 on the left, forming a relatively large static magnetic gap 8. The lateral displacement of the armature hook 4 on the left is actually caused by the rotation around the left rotating shaft 5. The vertical hook guide rail 10 of the substrate 1 is a full-range linear guide rail, which is engaged with the limiting convex edge 705 on the vertical hook 7 to ensure that the vertical hook 7 has no lateral displacement when moving up and down.

[0057] Example 2

[0058] See also Figure 2 and Figure 3 As shown, in this embodiment, the rotating shaft 5 of the armature hook 4 is above the electromagnet 3. The vertical hook 7 is hung on the armature hook 4 through the hook tip, so the armature hook 4 must be rigid. Usually the armature hook 4 is made of soft iron material, and its rigidity can meet the pressure of the vertical hook 7.

[0059] from Figure 2 It can be clearly seen that the right side of the substrate 1 is in the "off" state, the right vertical hook 7 pushes the armature hook 4 to the right magnetic extreme end of the electromagnet 3 through the convex edge 702, and is in the position of the dynamic magnetic gap 9, the right spring 6 is compressed, and the electromagnet 3 coil is energized at this time, the electromagnet 3 suction force is greater than the elastic force of the right spring 6, and the right armature hook 4 will be sucked into the closed magnetic circuit position and maintained at this position. If the right vertical hook 7 moves downward at this time, the hook can be unhooked.

[0060] The left side of the substrate 1 is in a "hanging" state. The armature hook 4 on the left side moves away from the left magnetic pole of the electromagnet 3 under the action of the spring 6 on the left side, to the position of the static magnetic gap 8, and forms a hanging state with the vertical hook 7 on the left side. It can be seen that the armature hook 4 of Example 2 is different from that of Example 1 in shape, but the shape of the vertical hook 7 is the same. 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.

[0061] In the design of the magnetic circuit of the electromagnet, the rotating shaft can also be arranged in the middle of the armature hook, so that the hook tip of the armature hook and the magnetic pole end are arranged at both ends of the rotating shaft. In this case, the movement directions of the hook tip of the armature hook and the magnetic pole end are opposite.

[0062] The above two embodiments both adopt the method of setting the convex edge on the vertical hook, and the convex edge is below the hook tip of the vertical hook. However, the convex edge can also be set on the armature hook, and the convex edge is set above the hook tip of the armature hook. When the vertical hook moves upward, the armature hook is horizontally displaced to reach the dynamic magnetic gap position and form a decoupling margin.

[0063] The magnetic pole of the armature hook of the present invention can move between three positions: from the static magnetic gap to the dynamic magnetic gap 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 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). This technical solution can be used in various electromagnetic needle selector solutions and obtain favorable effects, so it should be protected by the present invention.

[0064] Based on this, the present invention can also be made into a jacquard assembly that cooperates with the low-power and high-reliability needle selection device disclosed above.

[0065] Furthermore, the present invention can also be made into a jacquard machine equipped with the low-power and high-reliability needle selection device disclosed above, or equipped with the jacquard assembly disclosed above.

[0066] In fact, the present invention proposes a new working mode, namely semi-active.

[0067] At present, there are two working modes in the design of needle selectors: the "active" working mode represented by the Bonas needle selector and the "passive" working mode represented by the Stäubli needle selector. The active mode is that the electromagnetic force generated by the electromagnet after power is turned on "actively" attracts the armature hook to the closed magnetic circuit position. Its advantages are simple structure and clear action. Its disadvantages are that it requires a larger electromagnet, high power consumption, large size, and small hook depth (so small that it will fail due to wear and tear). The passive mode is that the armature hook is pushed to the closed magnetic circuit position of the electromagnet magnetic pole by an external mechanism. At this time, the electromagnetic force generated by the electromagnet when power is turned on keeps the armature hook in this position. Its advantages are that the required electromagnet has small suction force, small size, low power consumption, and large hook depth. Its disadvantages are that the mechanism is complex, the manufacturing cost is high, and an elastic vertical hook must be used, and the action reliability is poor under complex working conditions.

[0068] In these two typical working modes, the armature hook moves in two positions, one is the static magnetic gap position, and the other is the closed magnetic circuit position, while the present invention proposes a third position: the dynamic magnetic gap position. The movement of the armature hook from the static magnetic gap position to the dynamic magnetic gap position is "passive" and is determined by an external mechanism, while the movement of the armature hook from the static magnetic gap to the closed magnetic circuit position is "active" by the electromagnet, so this working mode is called "semi-active". This is the core technical contribution of the present invention, which overcomes the technical defects of the aforementioned existing solutions and achieves better technical effects.

[0069] In fact, the present invention proposes a new hook unhooking technology, that is, setting and maintaining a convex edge higher than the hook tip to form an unhooking margin and a knife lifting tolerance to ensure the reliability of the action under complex working conditions. A larger hook can be designed to reliably enter the hook state and achieve a larger hook load, without worrying about the difficulty of unhooking a large hook. Sufficient design margin can ensure smooth unhooking under complex working conditions.

[0070] In fact, the comprehensive application of the technology of the present invention allows greater freedom in the design of the jacquard machine needle selection device. There can be a solution in which the tip of the armature hook is above the electromagnet, and there can also be a solution in which the tip of the armature hook is below the electromagnet, and these two solutions can share the same vertical hook, which is very beneficial in the further design of high-density needle selectors.

[0071] 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 low-power and high-reliability needle selection device, characterized in that: The invention comprises a substrate (1), wherein both sides of the substrate (1) are provided with full-range linear vertical hook guide rails (10), the middle part of the substrate (1) is provided with a pulley block slide groove, the upper part of the substrate (1) is provided with an electromagnet (3) through an electromagnet frame (2), an armature hook (4) is respectively provided on the left and right sides of the electromagnet (3), the shaft hole parts of the two armature hooks (4) are respectively rotatably connected to the substrate (1) through corresponding rotating shafts (5), the inner side surfaces of the hook tips of the two armature hooks (4) are respectively elastically connected to the left and right side surfaces of the electromagnet frame (2) through corresponding springs (6), and the straight rod part of the armature hook (4) cooperates with the two magnetic poles of the electromagnet (3) to form a closed magnetic circuit; a vertical hook (7) for cooperating with the armature hook (4) on the corresponding side is respectively provided in the vertical hook guide rails (10) on both sides of the substrate (1), and the substrate (1) A wire pulley block is arranged in the pulley block slideway, and the two vertical hooks (7) drive the wire pulley block to slide up and down through the upper pulley line; a convex edge (702) is arranged below the hook tip (701) of the two vertical hooks (7) for horizontally pushing and holding the armature hook (4) on the corresponding side; when the vertical hook (7) moves upward, the convex edge (702) pushes the armature hook (4) on the same side to rotate around the corresponding rotating shaft (5), and the magnetic pole part of the armature hook (4) moves from the static magnetic gap (8) position away from the magnetic pole of the electromagnet (3) to the direction close to the magnetic pole of the electromagnet (3), and the magnetic pole part of the armature hook (4) is stopped at the dynamic magnetic gap (9) position close to the magnetic pole of the electromagnet (3) through the convex edge (702), and at this time, the coil of the electromagnet (3) is energized to attract the armature hook (4) to the closed magnetic circuit position.

2. The low power consumption and high reliability needle selection device according to claim 1 is characterized in that: The vertical hook (7) comprises a rod-shaped body (703), a side ear (704) for hooking with a lifting knife is arranged in the middle of one side of the rod-shaped body (703), the hook tip (701) is arranged at the top of the other side of the rod-shaped body (703), and the hook tip of the hook tip (701) is close to the edge of the other side of the rod-shaped body (703), the hook bottom of the hook tip (701) is close to the axis of the rod-shaped body (703), the convex edge (702) is arranged at the upper edge of the other side of the rod-shaped body (703), and the convex edge (702) is higher than the hook tip of the hook tip (701), and the contour curve of the convex edge (702) is divided into position The push section (702a) is located at the upper section and the holding section (702b) is located at the lower section, the push section (702a) is an inclined curve starting from the hook bottom of the hook tip (701), and the holding section (702b) is a straight line parallel to the moving direction of the rod-shaped body (703), and the push section (702a) and the holding section (702b) are smoothly connected; in the early stage of the upward process of the vertical hook (7), the push section (702a) can generate an outward lateral thrust on the armature hook (4) in contact with it, and in the middle and late stages of the upward process of the vertical hook (7), the holding section (702b) can exert a holding force on the armature hook (4) that has generated a lateral displacement.

3. The low power consumption and high reliability needle selection device according to claim 2 is characterized in that: The distance from the bottom of the retaining section (702b) to the bottom of the hook tip portion (701) is greater than the distance from the hook tip of the hook tip portion (701) to the bottom of the hook of the hook tip portion (701).

4. The low power consumption and high reliability needle selection device according to claim 2 is characterized in that: The length of the retaining section (702b) of the convex edge (702) corresponds to the tolerance range of the jacquard machine knife lifting height allowed by the needle selection device to which it belongs. Within this tolerance range, the armature hook (4) in contact with the convex edge (702) remains in the dynamic magnetic gap (9) position.

5. The low power consumption and high reliability needle selection device according to claim 2, characterized in that: The dynamic magnetic gap (9) is the distance between the magnetic pole surface of the armature hook (4) and the magnetic pole surface of the electromagnet (3) when the armature hook (4) is acted upon by the convex edge (702), and the value range of the dynamic magnetic gap is 0 to 0.3 mm.

6. The low power consumption and high reliability needle selection device according to claim 2, characterized in that: A limiting convex edge (705) is provided along the edge of the middle and lower part of the other side of the rod-shaped body (703) for engaging with the vertical hook guide rails (10) on both sides of the substrate (1) and ensuring that the vertical hook (7) does not produce lateral displacement, and the top end of the limiting convex edge (705) is connected to the bottom end of the convex edge retaining section (702b) in a parallel straight line.

7. The low power consumption and high reliability needle selection device according to claim 2 is characterized in that: At least one shock-absorbing groove (706) for isolating vibration caused by lifting the knife is provided between the side ear portion (704) and the rod-shaped body (703).

8. The low power consumption and high reliability needle selection device according to claim 2, characterized in that: The surface of the substrate (1) is provided with a limiting protrusion for preventing the armature hook (4) from excessively moving outward laterally under the action of the spring (6), and the limiting protrusion does not interfere with the movement of the vertical hook (7) in the vertical hook guide rail (10).

9. A jacquard assembly, characterized in that: The jacquard assembly is matched with the low-power and high-reliability needle selection device as described in any one of claims 1-8.

10. A jacquard machine, characterized in that: The jacquard machine is equipped with a low-power consumption and high-reliability needle selection device as described in any one of claims 1 to 8, or is equipped with the jacquard assembly as described in claim 9.

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