Bipolar magnetic bar structure of needle selector

Abstract

The invention relates to a bipolar magnetic bar structure of a needle selector. Relates to the technical field of needle selectors. The device specifically comprises a first magnetic bar and a second magnetic bar which are arranged at an interval, a first coil arranged on the first magnetic bar, and a second coil arranged on the second magnetic bar, the first magnetic bar is magnetized to form an N pole, the second magnetic bar is magnetized to form an S pole, the electrified first coil demagnetizes the first magnetic bar, and the electrified second coil demagnetizes the second magnetic bar. The first magnetic bar is magnetized to form an N pole, the second magnetic bar is magnetized to form an S pole, and when the first magnetic bar and the second magnetic bar attract the corresponding spring needles at the same time, the spring needles conduct the first magnetic bar of the N pole and the second magnetic bar of the S pole, so that magnetic induction lines outside the first magnetic bar and the second magnetic bar are spread in the spring needles; therefore, the magnetic field interference with the surrounding magnetic bars can be reduced, the energy loss of magnetic induction lines can be reduced, the accuracy of needle selection is ensured, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of needle selectors, and in particular to a bipolar magnetic bar structure of a needle selector. Background Art

[0002] Most of the sweaters people wear daily are made of yarns with different colors. During the production process, when one color of yarn is being knitted, the yarns of other colors need to stop knitting. Therefore, the yarns of different colors need to be selected and stopped constantly during the knitting process. At present, the market generally uses computer-controlled electromagnetic needle selection technology to control the knitting machine to select needles, thereby realizing the rearrangement of the sweater colors. Through the frequent operation of the needle selector, sweaters of various colors can be formed.

[0003] At present, the needle selectors of knitting machines mostly adopt electromagnetic needle selectors. Electromagnetic needle selectors are more and more widely used due to their simple structure and convenient use. Electromagnetic needle selectors are usually provided with a number of magnetic bars corresponding to the spring needles of the knitting machine. By magnetizing or demagnetizing the corresponding magnetic bars, the corresponding elastic needles are adsorbed or released, thereby achieving the purpose of needle selection.

[0004] In the prior art, for a single spring needle, the number of needle selector magnetic bars used is also single, and with a single magnetic pole, the magnetic flux loop is stray and the magnetic fields interfere with each other greatly. When the magnetic bar attracts or releases the corresponding spring needle, it is easy to produce a large magnetic force effect on the surrounding magnetic bars and spring needles, which may lead to needle selection errors, and then cause weaving errors, affecting production efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a bipolar magnetic bar structure for a needle selector in view of the above-mentioned deficiencies in the prior art, which can reduce the magnetic interference between the magnetic bars, thereby ensuring the accuracy of needle selection and improving production efficiency.

[0006] The present invention proposes a bipolar magnetic bar structure of a needle selector, comprising a first magnetic bar and a second magnetic bar arranged at intervals, a first coil arranged on the first magnetic bar, and a second coil arranged on the second magnetic bar; the first magnetic bar is N-pole after being magnetized, and the second magnetic bar is S-pole after being magnetized, and the current flow directions of the first coil and the second coil are opposite, the first coil that is energized demagnetizes the first magnetic bar, and the second coil that is energized demagnetizes the second magnetic bar.

[0007] Furthermore, the magnetic bar structure also includes a permanent magnet arranged between the first magnetic bar and the second magnetic bar, the first magnetic bar contacts the N pole of the permanent magnet and becomes the N pole after being magnetized by the permanent magnet, and the second magnetic bar contacts the S pole of the permanent magnet and becomes the S pole after being magnetized by the permanent magnet.

[0008] Furthermore, the first magnetic bar extends in the vertical direction, the bottom of the first magnetic bar contacts the N pole of the permanent magnet, and the top is provided with a first contact surface, and the first contact surface contacts the spring pin to adsorb the spring pin.

[0009] Furthermore, the second magnetic bar extends in the vertical direction, the bottom of the second magnetic bar contacts the S pole of the permanent magnet, and the top is provided with a second contact surface, and the second contact surface contacts the spring pin to adsorb the spring pin.

[0010] Furthermore, the top of the first magnetic bar and the top of the second magnetic bar are on the same horizontal plane.

[0011] Furthermore, the first coil is wound around the outer circumference of the first magnetic bar from bottom to top, and the second coil is wound around the outer circumference of the second magnetic bar from top to bottom.

[0012] Furthermore, the head end of the first coil is connected to the positive pole of the circuit, the tail end is connected to the head end of the second coil, and the tail end of the second coil is connected to the negative pole of the circuit.

[0013] Furthermore, the magnetic bar structure further includes a spacer disposed between the first magnetic bar and the second magnetic bar, and the spacer is used to isolate the first magnetic bar from the second magnetic bar.

[0014] Furthermore, the first magnetic bar includes a main body and a bent portion, the bottom of the main body contacts the N pole of the permanent magnet, the bent portion is bent toward the second magnetic bar at the top of the main body, and the first contact surface is arranged at the top of the bent portion.

[0015] Furthermore, the main body extends in a vertical direction, the bending portion includes an inclined portion inclined toward the second magnetic bar at the top of the main body, and an extending portion extending vertically upward at the top of the inclined portion, and the first contact surface is arranged at the top of the extending portion.

[0016] The present invention also provides a method for manufacturing a bipolar magnetic rod structure, the method comprising the following steps: Step S1: Fit the bottom end of the first magnetic bar to the N pole of the permanent magnet, and fit the bottom end of the second magnetic bar to the S pole of the permanent magnet, so that the top end of the first magnetic bar after being magnetized is the N pole, and the top end of the second magnetic bar after being magnetized is the S pole; Step S2: a first coil is arranged on the first magnetic bar, and a second coil is arranged on the second magnetic bar, so that the current flow directions of the first coil and the second coil are opposite, the first coil being energized demagnetizes the first magnetic bar, and the second coil being energized demagnetizes the second magnetic bar.

[0017] Furthermore, step S1 further includes: Step S1.3: a spacer is provided between the first magnetic bar and the second magnetic bar, so that the spacer isolates an end of the first magnetic bar away from the permanent magnet from an end of the second magnetic bar away from the permanent magnet.

[0018] Further, step S2 includes: Step S2.1: Winding the enameled wire in a spiral shape from bottom to top around the outer circumference of the first magnetic bar to form the first coil; Step S2.2: pulling the enameled wire horizontally to the second magnetic bar at the top of the formed first coil; Step S2.3: Wrap the enameled wire in a spiral shape from top to bottom around the outer circumference of the second magnetic bar to form the second coil.

[0019] The present invention also proposes a method for using the bipolar magnetic rod structure, the method comprising the following steps: Provided is a bipolar magnetic bar structure, comprising a first magnetic bar and a second magnetic bar arranged at intervals, a permanent magnet arranged between the first magnetic bar and the second magnetic bar, a first coil arranged on the first magnetic bar, and a second coil arranged on the second magnetic bar, wherein the end of the first magnetic bar after being magnetized is an N pole, and the top end of the second magnetic bar after being magnetized is an S pole; The target soft magnet is adsorbed by the first magnetic bar and the second magnetic bar at the same time, and the target soft magnet is adsorbed on the top of the first magnetic bar and the second magnetic bar to form a closed magnetic line of force, so that the target soft magnet stops at the adsorption position; The first magnetic bar is demagnetized by energizing the first coil, and the second magnetic bar is demagnetized by energizing the second coil, so that the first magnetic bar and the second magnetic bar release the adsorbed target soft magnet, and the target magnet returns to the non-adsorbed position under the action of its own elastic force.

[0020] The bipolar magnetic bar structure of a needle selector proposed by the present invention has the following beneficial effects: (1) The first magnetic bar of the magnetic bar structure is magnetized to an N pole, and the second magnetic bar is magnetized to an S pole. When the first magnetic bar and the second magnetic bar simultaneously adsorb the corresponding spring needle, the spring needle conducts the first magnetic bar at the N pole and the second magnetic bar at the S pole, so that the magnetic flux lines outside the first magnetic bar and the second magnetic bar propagate in the spring needle, thereby reducing the magnetic field interference with the surrounding magnetic bars and the energy loss of the magnetic flux lines, thereby ensuring the accuracy of needle selection and improving production efficiency; (2) The magnetic rod structure also includes a first coil and a second coil. The first coil is arranged on the first magnetic rod, and the second coil is arranged on the second magnetic rod. The first magnetic rod is demagnetized by energizing the first coil, and the second magnetic rod is demagnetized by energizing the second coil, so that the first magnetic rod and the second magnetic rod release the adsorbed spring needle at the same time, thereby realizing the needle selection of the needle selector; (3) The magnetic bar structure of the magnetic bar structure also includes a permanent magnet. The first magnetic bar contacts the N pole of the permanent magnet, and the second magnetic bar contacts the S pole of the permanent magnet. The first magnetic bar, the permanent magnet and the second magnetic bar are regarded as a whole magnet. The first magnetic bar is the N pole of the magnet, and the second magnetic bar is the S pole of the magnet. The N pole and the S pole of the magnet are connected through the spring needle, so that the magnetic flux lines outside the magnet propagate in the spring needle, thereby reducing the magnetic field interference with the surrounding magnetic bars and reducing the energy loss of the magnetic flux lines, thereby ensuring the accuracy of needle selection and improving production efficiency; (4) The top of the first magnetic bar of the magnetic bar structure is provided with a first contact surface, and the top of the second magnetic bar is provided with a second contact surface. The first contact surface and the second contact surface are in contact with the spring needle at the same time, so that the spring needle conducts the first contact surface and the second contact surface, so that the magnetic flux lines transmitted from the first contact surface to the second contact surface are transmitted in the spring needle, thereby reducing the diffusion of the magnetic flux lines and reducing the mutual interference with the surrounding magnetic field, and reducing the energy loss of the magnetic flux lines, thereby enhancing the adsorption force of the first magnetic bar and the second magnetic bar on the spring needle; (5) The first contact surface and the second contact surface of the magnetic bar structure are arranged on the same horizontal plane. When the first magnetic bar and the second magnetic bar adsorb the spring needle, the first contact surface and the second contact surface are better in contact with the spring needle, so that the spring needle can better conduct the first contact surface and the second contact surface, further reducing the diffusion of the magnetic flux lines, enhancing the adsorption force of the first magnetic bar and the second magnetic bar on the spring needle, thereby ensuring the accuracy of needle selection and improving production efficiency; (6) The magnetic bar structure also includes a spacer, which isolates the first magnetic bar from the end of the second magnetic bar away from the permanent magnet, thereby preventing the first magnetic bar from directly contacting the end of the second magnetic bar away from the permanent magnet, thereby preventing the magnetic flux lines from directly propagating from the end of the first magnetic bar away from the permanent magnet to the end of the second magnetic bar away from the permanent magnet outside the integral magnet formed by the permanent magnet, the first magnetic bar and the second magnetic bar, thereby reducing the magnetic flux lines propagating from the spring pin, thereby enhancing the adsorption force of the first magnetic bar and the second magnetic bar on the spring pin; (7) The first magnetic bar of the magnetic bar structure includes a main body and a bent portion. The bent portion is bent at the top of the main body toward the second magnetic bar. On the one hand, it can reduce the distance between the first contact surface and the second contact surface, so that the first contact surface and the second contact surface can better contact with the spring needle; on the other hand, it can reduce the distance between the bent portion and the second magnetic bar, thereby reducing the thickness of the isolation sheet set between the bent portion and the second magnetic bar and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In the accompanying drawings, like reference numerals are used to represent like elements.

[0022] Figure 1 A front view of a bipolar magnetic bar structure of a needle selector according to an embodiment of the present invention; Figure 2 A schematic structural diagram of a bipolar magnetic bar structure of a needle selector according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a first magnetic bar of a bipolar magnetic bar structure of a needle selector according to an embodiment of the present invention.

[0023] In the figure: 1. first magnetic bar; 11. first contact surface; 12. main body; 13. inclined portion; 14. extension portion; 2. second magnetic bar; 21. second contact surface; 3. first coil; 4. second coil; 5. permanent magnet; 6. isolation plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 to Figure 3 A bipolar magnetic bar structure of a needle selector in an embodiment of the present invention comprises a first magnetic bar 1 and a second magnetic bar 2 arranged at intervals, a first coil 3 arranged on the first magnetic bar 1, and a second coil 4 arranged on the second magnetic bar 2; the first magnetic bar 1 is N-pole after being magnetized, and the second magnetic bar 2 is S-pole after being magnetized, and the current flow directions of the first coil 3 and the second coil 4 are opposite, the energized first coil 3 demagnetizes the first magnetic bar 1, and the energized second coil 4 demagnetizes the second magnetic bar 2.

[0026] In the present application, the magnetic bar structure includes a first magnetic bar 1 and a second magnetic bar 2, the first magnetic bar 1 and the second magnetic bar 2 are arranged at intervals, wherein the first magnetic bar 1 is N-pole after being magnetized, and the second magnetic bar 2 is S-pole after being magnetized, so that the corresponding spring pins are simultaneously adsorbed by the first magnetic bar 1 and the second magnetic bar 2. Due to the direction of the magnetic flux lines of the magnet, it is from N-pole to S-pole outside the magnet and from S-pole to N-pole inside the magnet. In the prior art, for a single spring pin, the needle selector magnetic bars used are all of the same pole.

[0027] Therefore, outside the magnetic bar, the magnetic flux lines are propagated from the N pole to the S pole in the air. The magnetic flux lines propagating in the air have stray loops and large energy losses, which can easily interfere with the magnetic fields of the surrounding magnetic bars and reduce the adsorption force of the magnetic bars on the corresponding spring needles, which may lead to needle selection errors, knitting errors, and affect production efficiency.

[0028] In the present application, the first magnetic bar 1 is magnetized to be an N pole, and the second magnetic bar 2 is magnetized to be an S pole. When the first magnetic bar 1 and the second magnetic bar 2 simultaneously adsorb the corresponding spring needles, the spring needles connect the first magnetic bar 1 at the N pole and the second magnetic bar 2 at the S pole.

[0029] In this embodiment, the first magnetic bar 1, the second magnetic bar 2 and the spring needle are all made of soft magnetic materials. Since air is a non-magnetic medium, its magnetic resistance is much greater than that of soft magnetic materials, and similar to electric current, magnetic flux lines always take the path with the smallest magnetic resistance (maximum magnetic permeability), so outside the first magnetic bar 1 and the second magnetic bar 2, most of the magnetic flux lines propagate from the N pole to the S pole in the spring needle.

[0030] On the one hand, it can prevent the magnetic flux lines propagating outside the first magnetic bar 1 and the second magnetic bar 2 from being scattered, thereby reducing the magnetic field interference with the surrounding magnetic bars; on the other hand, since the magnetic resistance of the spring needle is much smaller than the magnetic resistance of the air, the energy loss of the magnetic flux lines propagating in the spring needle is small, thereby enhancing the adsorption force of the first magnetic bar 1 and the second magnetic bar 2 on the corresponding spring needle, thereby ensuring the accuracy of needle selection and improving production efficiency.

[0031] In the present application, the magnetic bar structure also includes a first coil 3 and a second coil 4, the first coil 3 is arranged on the first magnetic bar 1, and the second coil 4 is arranged on the second magnetic bar 2. As mentioned above: the first magnetic bar 1 and the second magnetic bar 2 are made of soft magnetic materials, so after the first magnetic bar 1 and the second magnetic bar 2 are magnetized, they can simultaneously generate magnetic attraction to the corresponding spring pins, causing the spring pins to produce elastic deformation, thereby adsorbing the spring pins on the first magnetic bar 1 and the second magnetic bar 2.

[0032] When the first coil 3 is energized, the magnetic field formed in the first coil 3 has a magnetic flux line direction opposite to the magnetic flux line direction in the first magnetic bar 1. Therefore, the magnetic field formed in the first coil 3 and the magnetic field in the first magnetic bar 1 cancel each other out, thereby reducing the magnetic field strength of the first magnetic bar 1 and achieving demagnetization of the first magnetic bar 1; when the second coil 4 is energized, the magnetic field formed in the second coil 4 has a magnetic flux line direction opposite to the magnetic flux line direction in the second magnetic bar 2. Therefore, the magnetic field formed in the second coil 4 and the magnetic field in the second magnetic bar 2 cancel each other out, thereby reducing the magnetic field strength of the second magnetic bar 2 and achieving demagnetization of the second magnetic bar 2.

[0033] When the magnetic attraction of the first magnetic bar 1 and the second magnetic bar 2 on the spring pin is less than the elastic force of the spring pin to restore its own deformation, the first magnetic bar 1 and the second magnetic bar 2 release the adsorbed spring pin to restore the spring pin to its original shape. Therefore, in the present application, the first magnetic bar 1 and the second magnetic bar 2 adsorb or release the corresponding spring pin to change the position of the corresponding spring pin, thereby realizing the needle selection of the needle selector.

[0034] In one embodiment, initially, the first magnetic bar 1 and the second magnetic bar 2 do not adsorb the corresponding spring needle, and the spring needle is in a non-working position; when selecting the needle, the first magnetic bar 1 and the second magnetic bar 2 adsorb the corresponding spring needle, so that the spring needle moves from the non-working position to the working position to perform the weaving operation; after the work is completed, the first coil 3 and the second coil 4 are energized, and the first magnetic bar 1 and the second magnetic bar 2 release the corresponding spring needle, so that the spring needle returns to the non-working position and waits for the next weaving operation.

[0035] In another embodiment, initially, the first magnetic bar 1 and the second magnetic bar 2 adsorb the corresponding spring needle, and the spring needle is in the non-working position; when selecting the needle, the first coil 3 and the second coil 4 are energized, and the first magnetic bar 1 and the second magnetic bar 2 release the corresponding spring needle, so that the spring needle moves from the non-working position to the working position to perform the weaving operation; after the work is completed, the first coil 3 and the second coil 4 are de-energized, and the first magnetic bar 1 and the second magnetic bar 2 adsorb the corresponding spring needle, so that the spring needle returns to the non-working position and waits for the next weaving operation.

[0036] The needle selector of the present application is suitable for horizontal knitting machines such as glove machines, flat knitting machines, and collar knitting machines. That is, the magnetic bar structure uses the first magnetic bar 1 and the second magnetic bar 2 to simultaneously adsorb or release the corresponding spring needles of horizontal knitting machines such as glove machines, flat knitting machines, and collar knitting machines, thereby realizing needle selection of horizontal knitting machines such as glove machines, flat knitting machines, and collar knitting machines.

[0037] Specifically, the magnetic bar structure also includes a permanent magnet 5, which is arranged between the first magnetic bar 1 and the second magnetic bar 2, wherein the first magnetic bar 1 is in contact with the N pole of the permanent magnet 5, and the first magnetic bar 1 is magnetized to have an N pole through the permanent magnet 5; the second magnetic bar 2 is in contact with the S pole of the permanent magnet 5, and the first magnetic bar 1 is magnetized to have an S pole through the permanent magnet 5.

[0038] Therefore, after the first magnetic bar 1 and the second magnetic bar 2 are magnetized by the permanent magnet 5, it is equivalent to the first magnetic bar 1 extending the N pole of the permanent magnet 5, and the second magnetic bar 2 extending the S pole of the permanent magnet 5, that is, the first magnetic bar 1, the permanent magnet 5 and the second magnetic bar 2 are regarded as a whole magnet, the first magnetic bar 1 is the N pole of the magnet, and the second magnetic bar 2 is the S pole of the magnet.

[0039] The direction of the magnetic flux lines of the magnet is from the N pole to the S pole outside the magnet, that is, outside the magnet, the magnetic flux lines are transmitted in the air from the end of the first magnetic bar 1 away from the permanent magnet 5 to the end of the second magnetic bar 2 away from the permanent magnet 5. When the first magnetic bar 1 and the second magnetic bar 2 are attracted to the spring needle, the spring needle conducts the end of the first magnetic bar 1 away from the permanent magnet 5 and the end of the second magnetic bar 2 away from the permanent magnet 5, that is, the spring needle conducts the N pole and the S pole of the whole magnet.

[0040] Since the magnetic resistance of the spring needle is much smaller than that of the air, the magnetic flux lines preferentially select the path with the smallest magnetic resistance outside the magnet, so most of the magnetic flux lines are transmitted from the N pole to the S pole in the spring needle, thereby preventing the magnetic flux lines outside the magnet from being scattered and reducing mutual interference with the surrounding magnetic field, and reducing the energy loss of the magnetic flux lines, thereby enhancing the adsorption force of the first magnetic bar 1 and the second magnetic bar 2 on the spring needle, thereby ensuring the accuracy of needle selection and improving production efficiency.

[0041] In this embodiment, the first magnetic bar 1 and the second magnetic bar 2 both extend in the vertical direction. The bottom of the first magnetic bar 1 contacts the N pole of the permanent magnet 5, so that after the first magnetic bar 1 is magnetized by the permanent magnet 5, the N pole of the permanent magnet 5 is extended vertically upward; the bottom of the second magnetic bar 2 contacts the S pole of the permanent magnet 5, so that after the second magnetic bar 2 is magnetized by the permanent magnet 5, the S pole of the permanent magnet 5 is extended vertically upward.

[0042] A first contact surface 11 is provided on the top of the first magnetic bar 1, and a second contact surface 21 is provided on the top of the second magnetic bar 2. Outside the integral magnet formed by the permanent magnet 5, the first magnetic bar 1 and the second magnetic bar 2, magnetic flux lines propagate from the first contact surface 11 to the second contact surface 21 in the air.

[0043] When the first magnetic bar 1 and the second magnetic bar 2 adsorb the spring needle, the first contact surface 11 and the second contact surface 21 are in contact with the spring needle at the same time, so that the first contact surface 11 and the second contact surface 21 are connected through the spring needle, so that the magnetic flux lines propagating from the first contact surface 11 to the second contact surface 21 propagate inside the spring needle, thereby reducing the dispersion of the magnetic flux lines and reducing the mutual interference with the surrounding magnetic field, and reducing the energy loss of the magnetic flux lines, thereby enhancing the adsorption force of the first magnetic bar 1 and the second magnetic bar 2 on the spring needle.

[0044] Further, in this embodiment, the top of the first magnetic bar 1 and the top of the second magnetic bar 2 are on the same horizontal plane, that is, the first contact surface 11 and the second contact surface 21 are arranged on the same horizontal plane. In the previous embodiment, it is mentioned that when the first magnetic bar 1 and the second magnetic bar 2 adsorb the spring pin, the first contact surface 11 and the second contact surface 21 contact the spring pin at the same time.

[0045] Therefore, in the present application, the first contact surface 11 and the second contact surface 21 are arranged on the same horizontal plane so that when the first magnetic bar 1 and the second magnetic bar 2 adsorb the spring needle, the first contact surface 11 and the second contact surface 21 can better contact with the spring needle, so that the spring needle can better connect the first contact surface 11 and the second contact surface 21, further reduce the dispersion of magnetic lines of force, enhance the adsorption force of the first magnetic bar 1 and the second magnetic bar 2 on the spring needle, thereby ensuring the accuracy of needle selection and improving production efficiency.

[0046] In the previous embodiment, it is mentioned that the bottom of the first magnetic bar 1 contacts the N pole of the permanent magnet 5, so that the first magnetic bar 1 is N-pole after being magnetized, and the bottom of the second magnetic bar 2 contacts the S pole of the permanent magnet 5, so that the second magnetic bar 2 is S-pole after being magnetized. Outside the integral magnet formed by the permanent magnet 5, the first magnetic bar 1 and the second magnetic bar 2, the magnetic flux lines propagate in the air from the first contact surface 11 at the top of the first magnetic bar 1 to the second contact surface 21 at the top of the second magnetic bar 2.

[0047] Inside the overall magnet formed by the permanent magnet 5, the first magnetic bar 1 and the second magnetic bar 2, the magnetic flux lines pass through the second magnetic bar 2, the permanent magnet 5 and the first magnetic bar 1 in sequence, and then propagate from the second contact surface 21 at the top of the second magnetic bar 2 to the first contact surface 11 at the top of the first magnetic bar 1, thereby forming a closed loop with the magnetic flux lines outside the overall magnet.

[0048] Therefore, in the present application, the magnetic flux lines inside the first magnetic bar 1 are propagated from the bottom of the first magnetic bar 1 to the top of the first magnetic bar 1, and the magnetic flux lines inside the second magnetic bar 2 are propagated from the top of the second magnetic bar 2 to the bottom of the second magnetic bar 2, that is, the magnetic flux lines inside the first magnetic bar 1 are from bottom to top, and the direction of the magnetic flux lines inside the second magnetic bar 2 is from top to bottom.

[0049] In this embodiment, the first coil 3 is wound around the outer circumference of the first magnetic bar 1 from bottom to top, so that when the first coil 3 is energized, the magnetic field formed in the first coil 3 has a magnetic flux line direction opposite to the magnetic flux line direction in the first magnetic bar 1, so that the magnetic field formed in the first coil 3 and the magnetic field in the first magnetic bar 1 cancel each other out, reducing the magnetic field strength of the first magnetic bar 1, thereby achieving demagnetization of the first magnetic bar 1.

[0050] The second coil 4 is wound around the outer circumference of the second magnetic bar 2 from top to bottom, so that when the second coil 4 is energized, the magnetic field formed by the second coil 4 has a magnetic flux line direction opposite to the magnetic flux line direction in the second magnetic bar 2, so that the magnetic field formed by the second coil 4 and the magnetic field in the second magnetic bar 2 cancel each other out, reducing the magnetic field strength of the second magnetic bar 2, thereby achieving demagnetization of the second magnetic bar 2.

[0051] Since the direction of the magnetic field lines of force formed in the energized coil is related to the winding direction of the current in the energized coil, it is worth noting that when the first coil 3 is wound from bottom to top around the outer periphery of the first magnetic bar 1 and the second coil 4 is wound from top to bottom around the outer periphery of the second magnetic bar 2, the connection direction of the current in the first coil 3 and the second coil 4 must be designed according to the right-hand screw rule, so that the direction of the magnetic field lines of force formed in the first coil 3 and the second coil 4 is the above-mentioned direction.

[0052] In actual implementation, the first coil 3 and the second coil 4 can use the same set of power supply equipment for current flow, or they can use two sets of power supply equipment for current flow respectively. In order to make the structure of the needle selector more compact and reduce production costs, in this application, it is preferred that the first coil 3 and the second coil 4 use the same set of power supply equipment for current flow.

[0053] Specifically, in this embodiment, when making the first coil 3 and the second coil 4, the same enameled wire can be firstly wound around the outer periphery of the first magnetic bar 1 from bottom to top, and then wound around the outer periphery of the second magnetic bar 2 from top to bottom, thereby forming the first coil 3 around the outer periphery of the first magnetic bar 1 and the second coil 4 around the outer periphery of the second magnetic bar 2.

[0054] Then the head end of the enameled wire is connected to the positive pole of the power supply circuit, and the tail end of the enameled wire is connected to the negative pole of the power supply circuit, that is, the head end of the first coil 3 is connected to the positive pole of the circuit, the tail end is connected to the head end of the second coil 4, and the tail end of the second coil 4 is connected to the negative pole of the circuit, thereby forming a closed loop, realizing the use of a set of power supply equipment to simultaneously pass current through the first coil 3 and the second coil 4, thereby making the structure of the needle selector more compact and reducing production costs.

[0055] In this embodiment, the magnetic bar structure further includes a spacer 6, which is disposed between the first magnetic bar 1 and the second magnetic bar 2. Specifically, the spacer 6 is disposed at one end of the first magnetic bar 1 and the second magnetic bar 2 away from the permanent magnet 5, so that the first magnetic bar 1 and the second magnetic bar 2 are isolated from one end of the permanent magnet 5 by the spacer 6. It can be foreseen that in this actual implementation, the spacer 6 can be made of non-magnetic materials, such as copper, aluminum, stainless steel, etc., so that the spacer 6 can isolate the first magnetic bar 1 from the second magnetic bar 2.

[0056] In the present application, the reason why the first magnetic bar 1 and the second magnetic bar 2 are isolated from each other at one end away from the permanent magnet 5 by the isolation sheet 6 is to prevent the first magnetic bar 1 and the second magnetic bar 2 from directly contacting each other at one end away from the permanent magnet 5, thereby preventing the magnetic flux lines from being directly propagated from the end of the first magnetic bar 1 away from the permanent magnet 5 to the end of the second magnetic bar 2 away from the permanent magnet 5 outside the overall magnet formed by the permanent magnet 5, the first magnetic bar 1 and the second magnetic bar 2, thereby reducing the magnetic flux lines propagated from the spring needle, thereby enhancing the adsorption force of the first magnetic bar 1 and the second magnetic bar 2 on the spring needle.

[0057] In this embodiment, the first magnetic bar 1 includes a main body 12 and a bent portion. Since the main body 12 and the bent portion are an integrated structure, the bottom of the main body 12 contacts the N pole of the permanent magnet 5, so that the first magnetic bar 1 is magnetized as a whole and presents an N pole. The bent portion is arranged at the top of the main body 12, and the first contact surface 11 is arranged at the top of the bent portion. When the first magnetic bar 1 adsorbs the corresponding spring pin, the first contact surface 11 at the top of the bent portion contacts the spring pin, so that the first contact surface 11 at the top of the bent portion is connected to the second contact surface 21 at the top of the second magnetic bar 2 through the spring pin.

[0058] In the present application, since the bending portion is arranged at the top of the main body 12 and is bent toward the direction of the second magnetic rod 2, the bending of the bending portion can reduce the distance between the first contact surface 11 and the second contact surface 21 on the one hand, so that when the first magnetic rod 1 and the second magnetic rod 2 adsorb the spring needle, the first contact surface 11 and the second contact surface 21 can better contact with the spring needle, thereby enabling the spring needle to better connect the first contact surface 11 and the second contact surface 21.

[0059] On the other hand, the distance between the bent portion and the second magnetic bar 2 can be reduced, so that when the isolation sheet 6 is arranged between the bent portion and the second magnetic bar 2, an isolation sheet 6 with a smaller thickness can be used to isolate the first magnetic bar 1 from the second magnetic bar 2, thereby reducing production costs.

[0060] Further, in this embodiment, the main body 12 extends in the vertical direction, and the bent portion includes an inclined portion 13 and an extending portion 14, wherein the inclined portion 13 is arranged at the top of the main body 12, and the inclined portion 13 is inclined toward the second magnetic bar 2 at the top of the main body 12. The extending portion 14 is arranged at the top of the inclined portion 13, and the first contact surface 11 is arranged at the top of the extending portion 14, so that the first contact surface 11 and the second contact surface 21 are on the same horizontal plane through the extending portion 14 extending vertically upward at the top of the inclined portion 13, so that the first contact surface 11 and the second contact surface 21 can better contact with the spring pin.

[0061] Therefore, by inclining the inclined portion 13 at the top of the main body 12 toward the second magnetic bar 2, the distance between the first contact surface 11 and the second contact surface 21 is reduced, so that the first contact surface 11 and the second contact surface 21 can be better contacted with the spring needle, and the distance between the extension portion 14 and the second magnetic bar 2 can be reduced. Therefore, when the isolation sheet 6 is arranged between the bending portion and the second magnetic bar 2, a isolation sheet 6 with a smaller thickness can be used to isolate the first magnetic bar 1 from the second magnetic bar 2, thereby reducing the production cost.

[0062] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present invention.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bipolar magnetic bar structure of a needle selector, characterized in that: The invention comprises a first magnetic bar (1) and a second magnetic bar (2) which are arranged at intervals, a first coil (3) arranged on the first magnetic bar (1), and a second coil (4) arranged on the second magnetic bar (2); the first magnetic bar (1) is N-pole after being magnetized, the second magnetic bar (2) is S-pole after being magnetized, the first coil (3) and the second coil (4) have opposite current flow directions, the first coil (3) which is energized demagnetizes the first magnetic bar (1), and the second coil (4) which is energized demagnetizes the second magnetic bar (2).

2. A bipolar magnetic bar structure of a needle selector as claimed in claim 1, characterized in that: The magnetic bar structure further comprises a permanent magnet (5) arranged between the first magnetic bar (1) and the second magnetic bar (2); the first magnetic bar (1) contacts the N pole of the permanent magnet (5) and presents an N pole after being magnetized by the permanent magnet (5); and the second magnetic bar (2) contacts the S pole of the permanent magnet (5) and presents an S pole after being magnetized by the permanent magnet (5).

3. A bipolar magnetic bar structure of a needle selector as claimed in claim 2, characterized in that: The first magnetic bar (1) extends in a vertical direction, the bottom of the first magnetic bar (1) contacts the N pole of the permanent magnet (5), and the top is provided with a first contact surface (11), the first contact surface (11) contacts the spring pin to adsorb the spring pin.

4. A bipolar magnetic bar structure of a needle selector as claimed in claim 2 or 3, characterized in that: The second magnetic bar (2) extends in a vertical direction, the bottom of the second magnetic bar (2) contacts the S pole of the permanent magnet (5), and the top is provided with a second contact surface (21), the second contact surface (21) contacts the spring pin to adsorb the spring pin.

5. A bipolar magnetic bar structure of a needle selector as claimed in claim 2, characterized in that: The top of the first magnetic bar (1) and the top of the second magnetic bar (2) are on the same horizontal plane.

6. A bipolar magnetic bar structure of a needle selector as claimed in claim 1, characterized in that: The first coil (3) is wound around the outer circumference of the first magnetic bar (1) from bottom to top, and the second coil (4) is wound around the outer circumference of the second magnetic bar (2) from top to bottom.

7. A bipolar magnetic bar structure of a needle selector as claimed in claim 6, characterized in that: The head end of the first coil (3) is connected to the positive pole of the circuit, and the tail end is connected to the head end of the second coil (4), and the tail end of the second coil (4) is connected to the negative pole of the circuit.

8. A bipolar magnetic bar structure of a needle selector as claimed in claim 3, characterized in that: The magnetic bar structure further comprises an isolation plate (6) arranged between the first magnetic bar (1) and the second magnetic bar (2), wherein the isolation plate (6) is used to isolate the first magnetic bar (1) from the second magnetic bar (2).

9. A bipolar magnetic bar structure of a needle selector as claimed in claim 8, characterized in that: The first magnetic bar (1) comprises a main body (12) and a bent portion, the bottom of the main body (12) contacts the N pole of the permanent magnet (5), the bent portion is bent at the top of the main body (12) towards the second magnetic bar (2), the first contact surface (11) is arranged at the top of the bent portion, and the isolation sheet (6) is arranged between the bent portion and the second magnetic bar (2).

10. A bipolar magnetic bar structure for a needle selector as claimed in claim 9, characterized in that: The main body (12) extends in a vertical direction, the bent portion comprises an inclined portion (13) inclined at the top of the main body (12) in the direction of the second magnetic bar (2), and an extending portion (14) extending vertically upward at the top of the inclined portion (13), the first contact surface (11) is arranged at the top of the extending portion (14), and the isolation sheet (6) is arranged between the extending portion (14) and the second magnetic bar (2).

Images