Linear motor winding and fixing tool for power tools and method

Abstract

The application discloses a linear motor winding and fixing tool and method for power tools, comprising a main shaft, the outer periphery of which is used for sleeving a winding barrel, an adjusting shaft is arranged in the hollow inner cavity of the main shaft, the adjusting shaft can be axially displaced and / or rotated relative to the main shaft, the main shaft is provided with a group of circumferential grooves, a flexible winding barrel support is arranged in the circumferential grooves, the thickness of the winding barrel support is less than or equal to the depth of the circumferential grooves, the adjusting shaft and the main shaft are provided with expansion structures, the axial displacement and / or rotation of the adjusting shaft is converted into the radial expansion of the winding barrel support, the outer peripheral surface of the winding barrel support protrudes from the outer circumferential surface of the main shaft and is always in close contact with the inner wall of the winding barrel, and then the winding barrel is fixed with the main shaft. The technical scheme of the application is mainly characterized by high winding positioning efficiency and accuracy, convenient operation without the need of multiple sets of tools, and batch production.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and in particular to a linear motor winding and fixing tool and method for power tools. Background Technology

[0002] Currently, reciprocating motion in power tools is driven by linear motors, such as those disclosed in the applicant's Chinese patents CN111371279A and 202020527777.4. The stator mechanism of linear motors, including the more complex stator mechanisms currently on the market, encounters winding and fixing issues, which must be handled with specialized tools. The market typically uses a method of winding one coil at a time, potting one group at a time, and then curing each group at high temperature, which is very inefficient. This also reduces the number of winding layers, requiring space on the outermost layer (at least one less layer) to connect the windings, making the process complex and involving many steps. Furthermore, the windings need to be connected, and there are issues with poor soldering; high solder joints are easily damaged by the stator's external magnetic cylinder. The situation is even more complex when there are reversible windings; the wiring must be neat and aligned with the outer layer before soldering the enameled wire, otherwise it is easily damaged by the external magnetic cylinder.

[0003] Based on these problems, it is necessary to invent a specialized power tool for winding and fixing linear motors. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a linear motor winding and fixing tool and method for power tools, which realizes efficient and space-saving winding and fixing functions.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A linear motor winding and securing tool for power tools includes a spindle with a hollow inner cavity. A first end of the spindle is connected to the output shaft of a winding machine and receives its power. A second end has a knob engagement portion, the outer periphery of which is used to fit a winding drum. An adjusting shaft is coaxially disposed within the hollow inner cavity of the spindle. A knob is fixed to one end of the adjusting shaft, and the knob engages with the spindle to drive the adjusting shaft to produce axial displacement and / or rotation relative to the spindle. The spindle has a set of circumferential grooves, within which an elastic winding drum support is placed. The thickness of the winding drum support is less than or equal to the depth of the circumferential grooves. An expansion structure exists between the adjusting shaft and the spindle, converting the axial displacement and / or rotation of the adjusting shaft into radial expansion of the winding drum support. This causes the outer circumferential surface of the winding drum support to protrude beyond the outer circumferential surface of the spindle and always press against the inner wall of the winding drum, thereby fixing the winding drum to the spindle.

[0007] Preferably, the expansion structure includes a plurality of radially radiating holes located on the main shaft. The radially radiating holes penetrate the circumferential wall of the main shaft and are disposed in the circumferential groove. A steel ball is disposed in the radially radiating hole, and the steel ball abuts against the adjusting shaft and the winding drum support.

[0008] Preferably, the outer periphery of the adjusting shaft is provided with an intermittent concave-convex structure, which matches the arrangement position of the radial radiation holes and steel balls.

[0009] Preferably, the winding drum support is an open steel sleeve.

[0010] Preferably, the diameter of the first end of the spindle is larger than the diameter of the second end, and there is a step between the two, with the winding drum abutting against the step.

[0011] Preferably, a first magnetic tooth locator is provided on the large circumferential surface of the step. The first magnetic tooth locator is magnetic and is used to attract and position the magnetic tooth located on the first outer side at the step. Adjacent magnetic teeth are spaced apart by a second magnetic tooth locator, which is also magnetic. A third magnetic tooth locator is provided on the second end of the main shaft. The third magnetic tooth locator is magnetic and is used to position and limit the magnetic tooth on the second outer side.

[0012] Preferably, the first, second, and third magnetic tooth positioners each have a built-in magnet.

[0013] Preferably, the second magnetic tooth positioner is a two-part assembly structure.

[0014] Preferably, the hollow inner cavity of the main shaft has a limiting step 18 to prevent the adjustment shaft from falling off.

[0015] This invention also discloses a method for winding and fixing the wire of a linear motor for power tools, comprising the following steps:

[0016] S1. Provide a linear motor winding and fixing tool for power tools as described above, wherein the steel ball is located in the recess of the concave-convex structure of the adjusting shaft;

[0017] S2. The winding drum is fitted onto the outer circumference of the main shaft of the linear motor winding and fixing tool for power tools, and abuts against the end face of the step to form an axial fixation.

[0018] S3. Magnetic teeth and a second magnetic tooth positioner are respectively sleeved at intervals on the outer periphery of the winding drum, wherein the first outer magnetic tooth is positioned at the step, and the second outer magnetic tooth is axially limited and radially positioned by sleeved with a third magnetic tooth positioner.

[0019] S4. Rotate the knob to drive the adjusting shaft to move axially and / or rotate. At this time, the steel ball is located at the convex part of the concave-convex structure of the adjusting shaft, driving the winding drum support to expand radially, so that the outer circumferential surface of the winding drum support protrudes from the outer circumferential surface of the main shaft and is always pressed against the inner wall of the winding drum, thereby completely fixing the winding drum to the main shaft.

[0020] S5. Sequentially disassemble the second magnetic tooth positioner, sequentially wind the wire, and perform insulation treatment during the winding process until the winding is completed and the stator outer magnetic cylinder is fitted on.

[0021] S6. Rotate the knob in the opposite direction to drive the adjusting shaft to move and / or rotate in the opposite axial direction. At this time, the steel ball is back in the concave part of the concave-convex structure of the adjusting shaft, and the winding drum support is elastically reset.

[0022] S7. Remove the assembled power tool linear motor stator and third magnetic tooth positioner from the spindle, separate the two, and selectively perform high-temperature curing on the power tool linear motor stator.

[0023] The advantages of the technical solution of this invention are mainly reflected in: high and accurate winding positioning efficiency, convenient operation without the need for multiple sets of tools, and the ability to achieve mass production. Attached Figure Description

[0024] Figure 1 is a front view of the linear motor winding and fixing tool for power tools of the present invention, at which time the winding drum support is in normal condition.

[0025] Figure 2 yes Figure 1 A cross-sectional view along the middle section GG;

[0026] Figure 3 This is a right view of the linear motor winding and fixing tool for power tools according to the present invention;

[0027] Figure 4 is Figure 3 A sectional view along the middle AA;

[0028] Figure 5 yes Figure 1 Enlarged view of section A;

[0029] Figure 6 is a front view of the linear motor winding and fixing tool for power tools of the present invention, at which time the winding drum support is in an expanded state.

[0030] Figure 7 yes Figure 6 A cross-sectional view along the middle HH;

[0031] Figure 8 yes Figure 6 Enlarged view of section B;

[0032] Figure 9 is a front view of the linear motor winding and fixing tool for power tools of the present invention, at which point the linear motor stator has been wound.

[0033] Figure 10 yes Figure 9 Sectional view along the middle FF. Detailed Implementation

[0034] The objectives, advantages, and features of this invention will be illustrated and explained through the following non-limiting description of preferred embodiments. In the description of the solutions, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for ease of description and simplification, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solutions, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0035] The present invention will now be described in conjunction with the accompanying drawings. The linear motor for power tools involved in the present invention can be applied to various equipment that requires linear movement, such as linear working machines in the tool industry, home appliance industry, toy industry, and some industries, and more specifically, such as electric nail guns, rivet guns, glue guns, jigsaws, reciprocating saws, electric picks, vacuum cleaners, etc.

[0036] Linear motors for power tools generally include a stator and a rotor. This invention relates to a winding and securing tool for the stator of a linear motor for power tools. The stator of a linear motor for power tools generally includes a winding drum 8, magnetic teeth 15 disposed around the outer periphery of the winding drum 8, enameled wire 21 wound between the magnetic teeth 15, and a stator outer magnetic cylinder 19 that houses the winding drum 8, magnetic teeth 15, and enameled wire 21.

[0037] like Figure 1 As shown, the present invention discloses a linear motor winding and fixing tool for power tools, including a main shaft 1 with a hollow inner cavity, including a first end 9 and a second end 10, which extend into cylinders of different diameters. The diameter of the first end 9 of the main shaft 1 is larger than the diameter of the second end 10. Therefore, there is a step 13 at the connection between the first end 9 and the second end 10. The winding cylinder 8 is sleeved on the outside of the cylinder of the second end 10, and one end of it abuts against the step 13 and can be axially fixed.

[0038] The first end 9 of the main shaft 1 is used to connect to the output shaft 2 of the winding machine and receive its power. Generally, as shown in the figure, the two are fixed by bolts.

[0039] An adjusting shaft 4 is coaxially arranged in the hollow cavity of the main shaft 1. This adjusting shaft is made of a wear-resistant material that is rust-free or rust-proofed, such as 20CrMnTi or 20CrMo. The hollow cavity of the main shaft 1 has a limiting step 18 to prevent the adjusting shaft 4 from falling off, and one end of the adjusting shaft 4 has a matching step. A knob 5 is fixed to the outward end of the adjusting shaft 4, and the knob 5 mates with the knob mating part of the main shaft 1. In this preferred embodiment, the knob 5 and the adjusting shaft 4 are fixed to each other by screws or pins, etc. The external thread of the knob 5 mates with the internal thread 3 of the main shaft 1 to drive the adjusting shaft 4 to produce axial displacement and / or radial rotation relative to the main shaft 1.

[0040] Alternatively, the main shaft is located within the step between the knob 5 and the adjusting shaft 4, and cannot move axially. By rotating it, the adjusting shaft can only move axially or only rotate axially.

[0041] Combination Figure 2 , 3 As shown in Figures 4 and 5, the main shaft 1 has at least one set of circumferential grooves 6, in which an elastic winding drum support 7 is placed. The winding drum support 7 is an open steel sleeve, particularly a wear-resistant and rust-proof open steel sleeve, such as SUS304. Of course, the winding drum support 7 can also be other elastic materials with a certain degree of rigidity.

[0042] Specifically, such as Figure 5 As shown, the thickness of the winding drum support 7 is less than or equal to the depth of the circumferential groove 6. Therefore, in the initial state, the winding drum support 7 is not exposed outside the outer circumferential surface of the main shaft 1.

[0043] In this invention, the adjusting shaft 4 and the main shaft 1 have an expansion structure that converts the axial displacement of the adjusting shaft 4 into the radial expansion of the winding drum support 7, so that the outer circumferential surface of the winding drum support 7 protrudes from the outer circumferential surface of the main shaft 1 and is always pressed against the inner wall of the winding drum 8, thereby fixing the winding drum 8 to the main shaft 1.

[0044] Specifically, in combination Figure 5 and Figure 8 As shown, the expansion structure includes a plurality of radially radiating holes 11 located on the main shaft 1. The radially radiating holes 11 penetrate the circumferential wall of the main shaft 1 and are only located within the circumferential groove 6. Each radially radiating hole 11 contains a steel ball 12, which abuts against the adjusting shaft 4 and the winding drum support 7. Of course, those skilled in the art will understand that selectively arranging steel balls 12 within the radially radiating holes 11 is also feasible.

[0045] The outer periphery of the adjusting shaft 4 is provided with spaced concave-convex structures 41, which match the arrangement positions of the radial radiation holes 11 and the steel balls 12. Those skilled in the art will recognize that either the axial movement of the adjusting shaft 4 alone, or its rotation alone, or both axial movement and rotation, can drive the concave-convex structures 41 to... Figure 5 and Figure 8 The situation can vary as shown, that is, the protrusions or concave portions of the convex-concave structure 41 can be selectively abutted against the steel ball 12.

[0046] like Figure 5 As shown, when the concave part of the concave-convex structure 41 abuts against the steel ball 12, the winding drum support 7 is in its initial state.

[0047] like Figure 8 As shown, when the protrusion of the concave-convex structure 41 abuts against the steel ball 12, the winding drum support 7 is in an expanded state. The outer circumferential surface of the winding drum support 7 protrudes from the outer circumferential surface of the main shaft 1 and is always pressed against the inner wall of the winding drum 8, thereby fixing the winding drum 8 to the main shaft 1.

[0048] Combination Figure 1 , Figure 4 , Figure 5 As shown, a first magnetic tooth positioner 14 is provided on the large circumferential surface of the step 13. This first magnetic tooth positioner 14 is magnetic and is used to attract and position the magnetic teeth 15 located on the first outer side of the step 13. Adjacent magnetic teeth 15 are spaced apart by a second magnetic tooth positioner 16, which is also magnetic. A third magnetic tooth positioner 17 is provided on the second end 10 of the main shaft 1. This third magnetic tooth positioner 17 is magnetic and is used to limit the movement of the magnetic teeth 15 on the second outer side. (Combined with...) Figure 2 , 3 As shown in Figure 4, the first magnetic tooth positioner 14, the second magnetic tooth positioner 16, and the third magnetic tooth positioner 17 all have built-in magnets 20. The second magnetic tooth positioner 16 has a two-part assembly structure.

[0049] It should be noted that the positioning of the magnetic tooth 15 by the first magnetic tooth positioner 14, the second magnetic tooth positioner 16, and the third magnetic tooth positioner 17 includes axial positioning and radial positioning. Radial positioning mainly includes the position of the wire groove of the magnetic tooth in the position required by the designer.

[0050] This invention also discloses a method for winding and fixing the wire of a linear motor for power tools, comprising the following steps:

[0051] S1. Provide a linear motor winding and fixing tool for power tools as described above, in which case the steel ball 12 is located in the recess of the concave-convex structure 41 of the adjusting shaft 4; as Figures 1 to 5 The revealed state;

[0052] S2. The winding drum 8 is fitted onto the outer periphery of the main shaft 1 of the linear motor winding and fixing tool for power tools, and abuts against the end face of the step 13 to form an axial fixation.

[0053] S3. Magnetic teeth 15 and second magnetic tooth positioners 16 are respectively sleeved at intervals on the outer periphery of the winding drum 8, wherein the first outer magnetic tooth 15 is positioned at the step 13, and the second outer magnetic tooth 15 is axially limited and radially positioned by sleeved third magnetic tooth positioners 17.

[0054] S4. Rotate knob 5 to drive the adjusting shaft 4 to move axially. At this time, steel ball 12 is located at the protrusion of the concave-convex structure 41 of the adjusting shaft 4, driving the winding drum support 7 to expand radially, so that the outer circumferential surface of the winding drum support 7 protrudes from the outer circumferential surface of the main shaft 1 and is always pressed against the inner wall of the winding drum 8, thereby completely fixing the winding drum 8 to the main shaft 1; Figures 6 to 8 The revealed state;

[0055] S5. Sequentially disassemble the second magnetic tooth positioner 16, sequentially wind the wire 21, and perform insulation treatment during the winding process until the winding is completed and the stator outer magnetic cylinder 19 is fitted on; Figures 9 to 10 The revealed state;

[0056] S6. Rotate the knob 5 in the opposite direction to drive the adjusting shaft 4 to move in the opposite axial direction. At this time, the steel ball 12 is repositioned in the concave part of the concave-convex structure 41 of the adjusting shaft 4, and the winding drum support 7 is elastically reset.

[0057] S7. Remove the assembled power tool linear motor stator and the third magnetic tooth positioner 17 from the spindle 1, separate the two, and selectively perform high-temperature curing on the power tool linear motor stator. Alternatively, high-temperature curing can be performed first, and then the assembled power tool linear motor stator and the third magnetic tooth positioner 17 can be removed from the spindle 1 and separated.

[0058] This invention has many other embodiments, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this invention.

Claims

1. A linear motor winding and fixing tool for power tools, characterized in that: The main shaft (1) includes a hollow inner cavity, a first end (9) for connecting the winding machine output shaft (2) and receiving power, a second end (10) with a knob matching part, and an outer periphery for sleeving the winding barrel (8). The hollow inner cavity of the main shaft (1) is coaxially provided with an adjusting shaft (4). An outward end of the adjusting shaft (4) is fixedly provided with a knob (5). The knob (5) is matched with the main shaft (1) to drive the adjusting shaft (4) to axially displace and / or rotate relative to the main shaft (1). The main shaft (1) has a set of circumferential grooves (6). The circumferential grooves (6) are placed with elastic winding barrel supports (7). The thickness of the winding barrel supports (7) is less than or equal to the depth of the circumferential grooves (6). The adjusting shaft (4) and the main shaft (1) have an expansion structure. The expansion structure converts the axial displacement and / or rotation of the adjusting shaft (4) into the radial expansion of the winding barrel supports (7). The outer peripheral surface of the winding barrel supports (7) protrudes from the outer circumferential surface of the main shaft (1) and is always in close contact with the inner wall of the winding barrel (8), thereby fixing the winding barrel (8) and the main shaft (1).

2. The linear motor winding and fixing tool for power tools according to claim 1, characterized by: The outer periphery of the adjusting shaft (4) is provided with a spaced concave-convex structure (41) matched with the arrangement position of the radial radiation hole (11) and the steel ball (12).

3. The linear motor winding and fixing tool for power tools according to claim 2, characterized in that: The winding barrel support (7) is an open steel sleeve.

4. The linear motor winding and fixing tool for power tools according to any one of claims 1 to 3, characterized in that: The diameter of the first end (9) of the main shaft (1) is greater than the diameter of the second end (10). A step (13) is arranged between the first end (9) and the second end (10). The winding barrel (8) is in contact with the step (13).

5. The linear motor winding and fixing tool for power tools according to claim 4, characterized in that: A first magnetic tooth positioner (14) is arranged on the large circumferential surface of the step (13). The first magnetic tooth positioner (14) has magnetism and is used for positioning the magnetic tooth (15) on the first outer side at the step (13). Adjacent magnetic teeth (15) are spaced by a second magnetic tooth positioner (16). The second magnetic tooth positioner (16) has magnetism. A third magnetic tooth positioner (17) is arranged on the second end (10) of the main shaft (1). The third magnetic tooth positioner (17) has magnetism and is used for positioning and limiting the magnetic tooth (15) on the second outer side.

6. The linear motor winding and fixing tool for power tools according to claim 5, characterized in that: The first magnetic tooth positioner (14), the second magnetic tooth positioner (16), and the third magnetic tooth positioner (17) are all internally provided with a magnet (20).

7. The linear motor winding and fixing tool for power tools according to claim 6, characterized in that: The second magnetic tooth positioner (16) is a two-half split structure.

8. The linear motor winding and fixing tool for power tools according to claim 1, characterized by: The hollow inner cavity of the main shaft (1) has a limiting step (18) for preventing the adjusting shaft (4) from falling off.

9. A method of winding and fixing a wire of a linear motor for a power tool, characterized by: The method comprises the following steps, S1, the power tool linear motor winding and fixing tool according to claim 1, wherein the steel ball (12) is located in the concave part of the concave-convex structure (41) of the adjusting shaft (4); S2, the winding barrel (8) is sleeved on the outer periphery of the main shaft (1) of the power tool linear motor winding and fixing tool, and is axially fixed by abutting against the end face of the step (13); S3, the magnetic teeth (15) and the second magnetic tooth positioner (16) are respectively sleeved on the outer periphery of the winding barrel (8) at intervals, wherein the magnetic teeth (15) on the first outer side are positioned at the step (13), and the magnetic teeth (15) on the second outer side are axially limited and radially positioned by sleeving the third magnetic tooth positioner (17); S4, the knob (5) is rotated to drive the adjusting shaft (4) to axially displace and / or rotate, wherein the steel ball (12) is located in the convex part of the concave-convex structure (41) of the adjusting shaft (4), the winding barrel support (7) is driven to radially expand, the outer peripheral surface of the winding barrel support (7) protrudes from the outer peripheral surface of the main shaft (1) and is always in close contact with the inner wall of the winding barrel (8), so that the winding barrel (8) is completely fixed with the main shaft (1); S5, the second magnetic tooth positioner (16) is sequentially disassembled, winding is sequentially performed, and insulation treatment is performed during winding, until the stator outer magnetic cylinder (19) is sleeved after winding is completed; S6, the knob (5) is reversely rotated to drive the adjusting shaft (4) to reversely axially displace and / or rotate, wherein the steel ball (12) is repositioned in the concave part of the concave-convex structure (41) of the adjusting shaft (4), and the winding barrel support (7) is elastically reset; S7, the assembled power tool linear motor stator and the third magnetic tooth positioner (17) are removed from the main shaft (1), the two are separated, and the power tool linear motor stator is selectively high-temperature cured.

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