Needle shaft slotting equipment and method

Abstract

The invention provides a needle shaft grooving device and method, the needle shaft grooving device comprises a vertical rotating disc, a grooving cutter and an ejection mechanism, bearing grooves for bearing needle shafts and arc rolling surfaces located between the adjacent bearing grooves are distributed on the circumferential surface of the rotating disc at equal intervals in the circumferential direction; the slotting cutter is a thick cutter, the front end of the slotting cutter is provided with a continuous arc cutting edge facing the circumferential surface of the rotating disc, and a slotting gap is formed between the arc cutting edge and the circumferential surface of the rotating disc; the ejection mechanism ejects the needle shaft out of the bearing groove when the rotating disc rotates the needle shaft to the inlet end of the arc cutting edge, and along with rotation of the rotating disc, the ejected needle shaft is transferred to the rear arc rolling face and is driven to enter the slotting gap. And the circular arc rolling surface presses and rubs the needle shaft to roll and move forwards on the circular arc cutting edge in the rotating process of the rotating disc, so that an annular groove is formed. According to the invention, the annular groove can be processed on the needle shaft with high hardness, so that the cutting edge of the grooving cutter is prevented from being broken.

Description

Technical Field

[0001] The invention relates to a pin shaft of a micro motor gear, to a processing device for the pin shaft, and in particular to a pin shaft slotting device and method. Background Art

[0002] In micro motors, a needle shaft is needed to support the internal micro gears. In order to install and position the needle shaft on the housing and prevent axial movement, annular grooves need to be opened on the circumference of both ends of the needle shaft. Figure 1 As shown, according to different specifications, the diameter of the needle shaft 1 ranges from 1.0 to 3.0 mm, the length ranges from 6.4 to 25.0 mm, the width of the groove 1a usually ranges from 0.05 to 0.5 mm, and the depth usually ranges from 0.01 to 0.2 mm. It can be seen that the needle shaft is a tiny precision part, which makes it difficult to machine annular grooves at both ends of the needle shaft.

[0003] In the past, the prior art used a disc milling cutter to machine the grooves at both ends of the needle shaft. Figure 2 As shown, the disc milling cutter has teeth 11 distributed circumferentially on the edge of the disc 10. The teeth 11 are used to machine annular grooves around the needle shaft by rotating the disc 11. However, it is found in the actual machining process that the disc milling cutter can only machine needle shafts with relatively low hardness, but for needle shafts with relatively high hardness such as stainless steel, the teeth are easily broken when the disc milling cutter is used for machining. Therefore, there is no grooving equipment and method in the prior art that can machine annular grooves on needle shafts with relatively high hardness. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a needle shaft grooving device which can process annular grooves on a needle shaft with relatively high hardness, so as to overcome the shortcomings of the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A needle shaft grooving device, comprising:

[0007] The vertical rotating disk has receiving grooves for receiving the needle shaft and arc rolling surfaces between adjacent receiving grooves distributed at equal intervals along the circumferential direction;

[0008] The slotting tool is a thick sheet tool, the front end of which has a continuous arc cutting edge facing the circumferential surface of the rotating disk, and a slotting gap is provided between the arc cutting edge and the circumferential surface of the rotating disk;

[0009] An ejection mechanism, which ejects the needle shaft out of the receiving groove when the rotating disk rotates the needle shaft to the entrance end position of the circular arc cutting edge;

[0010] As the rotating disk rotates, the ejected needle shaft is transferred to the arc rolling surface at the rear and driven into the slotted gap. During the rotation of the rotating disk, the arc rolling surface presses and rubs the needle shaft to roll forward on the arc cutting edge, thereby carving out an annular groove.

[0011] By adopting the above technical solution, the receiving groove of the vertical rotating disk can bring the needle shaft to the entrance position of the slotting tool, and the ejection mechanism can eject the needle shaft in the receiving groove that has reached the entrance position of the slotting tool and transfer it to the arc rolling surface at the rear. The arc rolling surface can apply a large extrusion force to the needle shaft, and a relatively thick blade with a continuous arc cutting edge is used. The cutting edge can withstand such a large extrusion pressure and the cutting edge will not collapse. Therefore, it is possible to machine an annular groove on a needle shaft with a relatively high hardness such as stainless steel. In a specific embodiment of the present invention, a feed trough is also included, and the discharge port of the feed trough faces and is close to the circumferential surface of the rotating disk. By using the feed trough and the cooperating vibration disk, the needle shaft can be continuously transported to the rotating disk, which improves the automation degree of the equipment and improves the processing efficiency.

[0012] In a specific embodiment of the present invention, a buffer mechanism is further included, wherein the buffer mechanism has an elastic member facing the circumferential surface of the rotating disk near the inlet end of the circular arc cutting edge. The added buffer mechanism can prevent the ejected needle shaft from impacting the cutting edge of the slotting tool, thereby protecting the cutting edge from being damaged.

[0013] In a specific embodiment of the present invention, a blocking member is further included, wherein the blocking member has a circumferential surface close to and facing the rotating disk and a blocking arc surface extending from the feed slot to the elastic member along the rotation direction of the rotating disk. With such a structure, the needle shaft can be prevented from being thrown out and falling during the rotation of the rotating disk.

[0014] In a specific embodiment of the present invention, the ejection mechanism includes a top plate with elastic telescopic function arranged at the bottom of each receiving groove and a blocking block arranged beside the rotating disk and relative to the entrance end of the arc cutting edge for resisting the extension of the top plate.

[0015] In a specific embodiment of the present invention, the slotting cutter has two pieces, which are arranged side by side and spaced in front of the circumferential surface of the rotating disk and close to the inner sides of the left and right edges of the circumferential surface. With such a structure, annular grooves can be processed at both ends of the needle shaft at the same time.

[0016] In a specific embodiment of the present invention, a tool adjustment mechanism for adjusting the slotting gap is also included. The tool adjustment mechanism can adjust the slotting gap, and further adjust the slotting depth and width of the annular groove.

[0017] In a specific embodiment of the present invention, the elastic member includes a movable baffle plate whose upper end is hinged to the lower end of the blocking member and an elastic support connected to the back of the movable baffle plate. The movable baffle plate has an arc-shaped baffle surface facing the circumferential surface of the rotating disk, and the arc-shaped baffle surface is closer to the circumferential surface of the rotating disk than the cutting edge of the slotting tool.

[0018] In addition, the present invention also provides a needle shaft grooving method based on the above-mentioned needle shaft grooving device, and the process of the needle shaft grooving method is as follows:

[0019] Input the needle shaft into the feed trough, and through the rotation of the rotating disk, the needle shaft of the feed trough falls into the receiving groove of the rotating disk in sequence;

[0020] When the rotating disk rotates one of the receiving grooves to the entrance end position of the arc cutting edge, the ejection mechanism ejects the needle shaft in the receiving groove;

[0021] As the rotating disk rotates, the ejected needle shaft is transferred to the arc rolling surface at the rear and driven into the slotted gap. During the rotation of the rotating disk, the arc rolling surface presses and rubs the needle shaft to roll forward on the arc cutting edge, thereby carving out an annular groove.

[0022] In summary, the present invention can achieve the goal of slotting annular grooves on a needle shaft with high hardness without causing the cutting edge of the slotting tool to be broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the structure of the needle shaft;

[0024] Figure 2 It is a schematic diagram of the structure of the disc milling cutter;

[0025] Figure 3 It is a structural schematic diagram of the needle shaft grooving device of the present invention;

[0026] Figure 4 It is a schematic diagram of the top plate structure equipped with a return spring;

[0027] Figure 5 It is a partial schematic diagram of the present invention located at the top plate position;

[0028] Figure 6 It is a partial schematic diagram of the present invention at the entrance end of the arc-shaped cutting edge;

[0029] Figure 7 It is a schematic structural diagram of the slotting tool of the present invention. DETAILED DESCRIPTION

[0030] like Figure 1As shown, the needle shaft slotting device of the present invention includes a base 100, a rotating disk 200, a slotting tool 300, a feed trough 400, an ejection mechanism 500, a tool adjustment mechanism 600, a blocking member 700 and a buffer mechanism 800.

[0031] Among them, a support frame 101 is provided on the base 100. The rotating disk 200 is supported by a rotating shaft 101a and is vertically installed on the supporting frame 101. The rotating shaft 101a is driven to rotate by a motor (not shown in the figure) and then drives the rotating disk 200 to rotate on the supporting frame 101. In the present invention, the rotating disk 200 is made of a harder material. In this embodiment, the rotating disk 200 is made of bearing steel, which can meet the wear resistance requirements and is also more economical.

[0032] A blanking station A and a slotting station B are provided around the circumference of the rotating disk 200. In this embodiment, the blanking station A is located above the circumference of the rotating disk 200, and the slotting station B is located in front of the circumference of the rotating disk 200.

[0033] The rotating disk 200 has receiving grooves 201 axially penetrating the rotating disk at equal intervals along the circumferential direction on its circumferential surface, and an arc rolling surface 202 is formed between adjacent receiving grooves 201. The receiving groove 201 has a width and depth that can only accommodate one needle shaft. The axial thickness of the rotating disk 200 is slightly less than the length of the needle shaft to be processed by 0.1-0.2mm.

[0034] A feed trough 400 is provided on the blanking station A. The trough body of the feed trough 400 is fixed on the support frame 101 and is located above the rotating disk 200. The main section 401 of the feed trough 400 is vertically located above the rotating disk 200, and the discharge port 402 faces and approaches the circumferential surface of the rotating disk 200. The upper end of the feed trough 400 has an arc-shaped smoothly transitioned feed port 403 connected to the main section 401. There is a small gap between the discharge port 402 and the discharge end face 404 of the feed trough 400 and the circumferential surface of the rotating disk 200, and the gap is much smaller than the diameter of the needle shaft. Such a structure makes the rotation of the rotating disk unaffected. In addition, it can also ensure that when the receiving groove 201 does not rotate to the bottom of the discharge port, the needle shaft in the feed trough 400 will not fall into the receiving groove 201, thereby ensuring that as the rotating disk 200 rotates, each receiving groove 201 can receive a needle shaft in turn.

[0035] The slotting tool 300 is located at the slotting station B. Specifically, a tool seat 310 is installed on the base 100 at a position corresponding to the slotting station B. The slotting tool 300 is installed on the tool seat 310 .

[0036] Combination Figure 6 and Figure 7As shown, in this embodiment, the slotting tool 300 is composed of two pieces, which are spaced and arranged side by side in front of the circumferential surface of the rotating disk 200 and close to the inner side of the left and right edges of the circumferential surface. Both are thick blades made of tungsten steel alloy, and the thickness range is 0.6-1.0mm. In this embodiment, 0.7mm is preferred. The front end of the slotting tool 300 has a continuous and uninterrupted arc cutting edge 301 along the width direction. The cross-sectional shape of the arc cutting edge 301 is an isosceles trapezoid. The length of the cutting edge should be able to ensure that the needle shaft can roll at least one circle on the cutting edge. Therefore, the length of the cutting edge is usually 2-4 times the circumference of the processed needle shaft. For example, when processing a needle shaft with a diameter of 1.0-1.5mm, the length of the cutting edge can be 14mm. The slotting tool 300 of such a structure has high strength. Even if it is subjected to high pressure, the cutting edge is not easy to collapse, and it can slot on materials with high hardness. By using two slotting tools spaced side by side, annular grooves can be processed at both ends of the needle shaft at one time. The arc cutting edge 301 faces the circumferential surface of the rotating disk 200 and forms a slot gap 302 with the circumferential surface.

[0037] Similarly, in order to enable the arc rolling surface 202 to always press the needle shaft to roll on the arc cutting edge of the slotting tool 300 during the slotting process, the arc length of the arc rolling surface 202 should not be less than the length of the arc cutting edge 301, and should be slightly longer than the length of the arc cutting edge 301, preferably 1 / 7-1 / 6 longer than the length of the arc cutting edge 301.

[0038] Combined with the picture Figures 4 to 6 As shown, the ejection mechanism 500 includes a top plate 510 with elastic expansion and contraction function arranged at the bottom of each receiving groove 201 and a blocking block 520 arranged beside the rotating disk 200 corresponding to the entrance end position of the arc cutting edge 301 for resisting the extension of the top plate 501.

[0039] Specifically, the top plate 510 is integrally formed of three parts: a protruding plate 511, a middle plate 512, and a contact block 513. The protruding plate 511 and the middle plate 512 are of equal thickness, the front and rear sides of the contact block 513 both protrude from the middle plate 512 to form steps 514 at the front and rear sides of the root of the middle plate, the middle plate 512 and the contact block 513 are of equal width and both protrude from the protruding plate 511 from the left and right sides (consistent with the axial direction of the rotating disk) to form convex shoulders 515 at the left and right sides of the upper end of the middle plate 512.

[0040] In addition, a cavity 230 is provided on the rotating disk 200 on the inner side of each receiving groove 201 and axially penetrates the rotating disk 200. A through hole 231 is provided between the receiving groove 201 and the cavity 230, which is connected and matches the shape of the extending plate 511. In addition, the cavity 230 is divided into a narrow cavity portion 232 close to the receiving groove 201 and a wide cavity portion 233 away from the receiving groove 201. The extending plate 511 of the top plate 510 is located in the through hole 231, and the middle plate 512 and the contact block 513 are located in the cavity 230. The left and right ends both protrude from the left and right end surfaces of the rotating disk 200, wherein the contact block 513 is located in the wide cavity portion 233, and the upper end portion of the middle plate 512 is located in the narrow cavity portion 232 so that an ejection stroke is formed between the boss 515 and the top surface of the narrow cavity portion 232. A spring hole 516 is also provided in the middle position of the middle plate 512. The top plate 510 further includes a return spring 517 placed in the spring hole 516, with both sides of the return spring 517 exposed outside the middle plate 512, so that the upper end of the return spring 517 abuts against the top surface of the wide cavity 233, and the lower end abuts against the step 514, thereby making the top plate 510 have an elastic function. Under the action of the return spring 517, in the initial state, the top surface of the extended plate 511 of the top plate 510 retracts to the bottom of the receiving groove 501.

[0041] There are two blocking blocks 520, which are symmetrically arranged at the left and right end surfaces of the rotating disk 200, opposite to the entrance end of the arc cutting edge 301, and located on the travel track of the contact portion 513a at the bottom of the contact block 513. In this embodiment, the blocking block 520 is a round roller. Specifically, the base 100 is provided with roller brackets 521 on the left and right sides of the rotating disk 200, and the rollers are installed on the roller brackets 521 through support shafts. In the present invention, the blocking block 520 is a round roller. On the one hand, the circumferential surface of the round roller has an arc surface that changes from low to high and then from high to low, so that when the contact blocks 513 in each receiving groove 201 pass through the roller in sequence, the round roller contacts the contact block 513, which gradually presses the top plate to gradually rise and push out the needle shaft located in the receiving groove 201, and after passing the highest point, the top plate is gradually retracted under the action of the return spring 517, realizing the telescopic function of the top plate. On the other hand, the roller also rotates in the process of pressing the top plate, so that the contact block 513 of the top plate can smoothly pass through the blocking member, ensuring the smooth rotation of the rotating disk 200. In order to make the contact block 513 pass over the roller more smoothly, the corner where the contact block 513 and the roller first contact is chamfered.

[0042] The tool adjustment mechanism 600 is composed of a slide rail 601, a slide seat 602, a locking column 603, a locking bolt 604 and a locking nut 605. The slide rail 601 is arranged below the tool seat 310 and fixed on the base 100. The extension direction of the slide rail 601 is consistent with the extension direction of the slotting tool 300. The slide seat 602 is fixed below the tool seat 310 and slidably mounted on the slide rail 601, which can drive the slotting tool 300 on the tool seat 310 to slide forward and backward. The locking column 603 is fixed on the base 100 and located in front of the slide rail 601. The upper end of the locking column 603 has a through hole. The locking bolt 604 is located in the through hole, and its rear end is fixedly connected to the tool seat 310. There are two locking nuts 605, which are respectively sleeved on the locking bolt 604 and are used to clamp and fix the locking bolt 604 on the locking column 603 from the front and rear of the through hole. When the position of the slotting tool 300 needs to be adjusted, the two locking nuts 605 are loosened, and the slide 602 is manually driven to slide on the slide rail 601, thereby adjusting the gap between the tool edge and the circumferential surface of the rotating disk 200, that is, adjusting the slotting gap. After the position of the slotting tool 300 is adjusted, the locking bolt 604 is clamped and fixed on the locking column 603 by tightening the two locking nuts, thereby ensuring that the gap width of the slotting gap does not change during the slotting process.

[0043] In order to prevent the needle shaft in the receiving groove 201 from being thrown out during the rotation of the rotating disk 200, a blocking member 700 is further provided along the rotation direction on the outer side of the circumferential surface of the rotating disk 200 and between the feeding station A and the slotting station B. The blocking member 700 has a blocking arc surface 701 facing and close to the circumferential surface of the rotating disk 200 and extending along the circumferential direction. The gap between the blocking arc surface 701 and the circumferential surface of the rotating disk 200 should be small enough to prevent the needle shaft from escaping, but should not hinder the rotation of the rotating disk 200.

[0044] When the receiving groove 201 rotates to the entrance end of the slotting tool 300 under the rotation of the rotating disk 200, the ejection mechanism 500 will eject the needle shaft, but the suddenly ejected needle shaft will impact the arc cutting edge of the slotting tool, thereby breaking the cutting edge of the tool. In order to avoid this situation, a buffer mechanism 800 is also provided at the slotting station B.

[0045] The buffer mechanism 800 has an elastic member 810 disposed at the entrance end position of the circular arc cutting edge and facing the circumferential surface of the rotating disk 200. The elastic member 810 includes a movable baffle 811 and an elastic support 820 supported on the back of the movable baffle 811. The elastic support 820 includes a support column 821 fixed on the tool holder 310, a rod sleeve 822 fixed on the top of the support column 821, and a push rod 823 and a supporting spring (not shown in the figure) disposed in the rod sleeve 822. Among them, one end of the rod sleeve 822 is a closed end and the other end is an open end facing the circumferential surface of the rotating disk 200. The push rod 823 is located in the rod sleeve 822 and extends from the open end of the rod sleeve 822 to connect with the movable baffle 811. One end of the supporting spring in the rod sleeve 822 is against the closed end of the rod sleeve, and the other end is against the push rod 823. The upper end of the movable baffle 811 is hinged to the lower end of the blocking member 700 (i.e., the end close to the slotting tool 300), and the movable baffle 811 also has an arc-shaped baffle surface 811a facing and close to the circumferential surface of the rotating disk 200. The lower end of the arc-shaped baffle surface 811a is close to the entrance end of the arc cutting edge and is pressed against the circumferential surface of the rotating disk 200 under the action of the elastic support 820, that is, under the action of the supporting spring, the lower end of the arc-shaped baffle surface 811 is closer to the circumferential surface of the rotating disk 200 than the arc cutting edge 301 of the slotting tool 300. In this way, when the ejection mechanism 500 ejects the needle shaft toward the receiving groove 201, the needle shaft will first hit the movable baffle 811. Under the action of the elastic support 820, the movable baffle 811 will first exert an elastic blocking force on the ejected needle shaft, and then under the ejection action of the ejection mechanism 500, the needle shaft will contact the arc cutting edge of the slotting tool 300. This reduces the impact of the ejected needle shaft on the cutting edge of the slotting tool 300, avoids the cutting edge of the slotting tool from being damaged, and extends the service life of the tool.

[0046] In the present invention, the axial length of the rotating disk 200 is slightly shorter than the length of the needle shaft to be processed, which is 0.1-0.2mm shorter. By aligning the feed groove 400 and the rotating disk 200 in the axial direction, the needle shaft is still on the arc rolling surface when entering the receiving groove 201, and the two ends of the needle shaft are only symmetrically exposed 0.05-0.1mm from the end surface of the rotating disk 200 in the axial direction. In this way, when the arc rolling surface applies force to roll the needle shaft, the force distributed on the needle shaft and the cutting edges on both sides is balanced, thereby ensuring that the width and depth of the annular grooves processed at both ends of the needle shaft are consistent, thereby ensuring the processing accuracy.

[0047] The base 100 is provided with a material drop opening 102 below the slotting tool 300. After the needle shaft with the annular groove processed is separated from the slotting tool 300 and the rotating disk 200, it falls downward and finally falls into a collection box (not shown in the figure) placed below the material drop opening 102 through the material drop opening 102.

[0048] The above is the needle shaft slotting device of the present invention, and the slotting method is as follows:

[0049] 1. Connect the outlet of the vibration plate with the feed port of the feed trough 400, and use the vibration of the vibration plate to feed the needle shaft into the feed trough 400 in sequence;

[0050] 2. The motor drives the rotating disk 200 to rotate. During the rotation of the rotating disk 200, the needle shafts located in the feed slot 400 fall into the receiving slots 201 in sequence;

[0051] 3. When one of the receiving grooves 201 drives a needle shaft to rotate to the entrance end position of the arc cutting edge 301 of the slotting tool 300, the ejector plate in the ejection mechanism 500 slides on the surface of the round roller as the blocking block 520 through the contact portion of the inner side end, and the ejector plate gradually rises to eject the needle shaft in the receiving groove 300 outward. During the ejection process, the needle shaft is first blocked by the buffer mechanism 700, and then gradually contacts the entrance end of the arc cutting edge;

[0052] 4. As the rotating disk 200 continues to rotate, the ejected needle shaft is transferred to the arc roller surface 202 behind the receiving groove 201 and driven into the slotting gap. The arc roller surface presses and rubs the needle shaft to roll forward on the arc cutting edge 301 during the rotation of the rotating disk 200 until it rolls to the exit end of the arc cutting edge. Finally, it falls out and separates from the slotting tool 300 and the rotating disk 200. At this point, an annular groove is chiseled out on the needle shaft. In this process, when the needle shaft enters the slotting gap, the contact portion 513 of the ejector plate in the ejection mechanism 500 passes over the highest point of the circular roller while following the rotation of the rotating disk 200 and gradually retracts under the action of the return spring. When it completely passes over the circular roller, the top surface of the protruding plate of the ejector plate retracts back to the bottom of the receiving groove 201.

[0053] It can be seen from the above introduction that the present invention can transfer the needle shaft to the arc rolling surface by rotating the rotating disk, and the arc rolling surface can be used to apply a large extrusion pressure to the needle shaft. A relatively thick blade with a continuous arc cutting edge is used, and the cutting edge can withstand such a large extrusion pressure without collapse. Therefore, it is possible to machine an annular groove on a needle shaft with a relatively high hardness such as stainless steel.

Claims

1. A needle shaft slotting device, characterized in that: include: The vertical rotating disk has receiving grooves for receiving the needle shaft and arc rolling surfaces between adjacent receiving grooves distributed at equal intervals along the circumferential direction; The slotting tool is a thick sheet tool, the front end of which has a continuous arc cutting edge facing the circumferential surface of the rotating disk, and a slotting gap is provided between the arc cutting edge and the circumferential surface of the rotating disk; An ejection mechanism, which ejects the needle shaft out of the receiving groove when the rotating disk rotates the needle shaft to the entrance end position of the circular arc cutting edge; As the rotating disk rotates, the ejected needle shaft is transferred to the arc rolling surface at the rear and driven into the slotted gap. During the rotation of the rotating disk, the arc rolling surface presses and rubs the needle shaft to roll forward on the arc cutting edge, thereby carving out an annular groove.

2. The needle shaft slotting device according to claim 1, characterized in that: A feeding trough is also included, wherein the discharge port of the feeding trough faces and is close to the circumferential surface of the rotating disk.

3. The needle shaft slotting device according to claim 2, characterized in that: It also includes a buffer mechanism, which has an elastic member located near the entrance end of the circular arc cutting edge and facing the circumferential surface of the rotating disk.

4. The needle shaft slotting device according to claim 3, characterized in that: It also includes a blocking member, which has a circumferential surface close to and facing the rotating disk and a blocking arc surface extending from the feeding groove to the elastic member along the rotating direction of the rotating disk.

5. The needle shaft slotting device according to claim 1, characterized in that: The ejection mechanism comprises an elastically retractable top plate arranged at the bottom of each receiving groove and a blocking block arranged beside the rotating disk and relative to the inlet end of the circular arc cutting edge for resisting the extension of the top plate.

6. The needle shaft slotting device according to claim 1, characterized in that: The slotting knife has two pieces, which are arranged side by side and spaced in front of the circumferential surface of the rotating disk and close to the inner sides of the left and right edges of the circumferential surface.

7. The needle shaft slotting device according to claim 1, characterized in that: The thickness of the slotting tool is 0.6-1.0 mm, and the length of the arc cutting edge is 2-4 times the circumference of the processed needle shaft.

8. The needle shaft slotting device according to claim 4, characterized in that: The elastic member comprises a movable baffle whose upper end is hinged to the lower end of the blocking member and an elastic support connected to the back of the movable baffle.

9. The needle shaft slotting device according to claim 8, characterized in that: The movable baffle has an arcuate baffle surface facing the circumferential surface of the rotating disk, and the arcuate baffle surface is closer to the circumferential surface of the rotating disk than the cutting edge of the slotting tool.

10. A needle shaft slotting method of a needle shaft slotting device according to any one of claims 1 to 9, characterized in that: Input the needle shaft into the feed trough, and through the rotation of the rotating disk, the needle shaft of the feed trough falls into the receiving groove of the rotating disk in sequence; When the rotating disk rotates one of the receiving grooves to the entrance end position of the arc cutting edge, the ejection mechanism ejects the needle shaft in the receiving groove; As the rotating disk rotates, the ejected needle shaft is transferred to the arc rolling surface at the rear and driven into the slotted gap. During the rotation of the rotating disk, the arc rolling surface presses and rubs the needle shaft to roll forward on the arc cutting edge, thereby carving out an annular groove.

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