A copper wire drawing cooling shunt guide structure

Abstract

The application discloses a copper wire drawing cooling shunt flow guide structure and relates to the technical field of drawing equipment. The application discloses a copper wire drawing cooling shunt flow guide structure and relates to the technical field of drawing equipment. The cooling liquid enters the flow guide barrel body, is guided through the spiral flow guide groove to form spiral flow close to the wall surface, and simultaneously drives the thermal deformation blade group to generate self-rotation turbulence, so that the spiral flow and the rotation turbulence cooperatively form a composite turbulent flow field, and the heat transfer coefficient of convection is greatly improved. The thermal deformation blade group adopts a bimetallic structure composed of brass and invar alloy, automatically bends and deforms to adjust the turbulence intensity with the change of the cooling liquid temperature, and is passively self-adapting and does not need external energy when the blades are opened to strengthen heat exchange at high temperature and are folded to reduce flow resistance at low temperature. The turbulence groove on the surface of the blade further destroys the boundary layer and enhances local disturbance.

Description

Technical Field

[0001] This invention relates to the field of wire drawing equipment technology, specifically a cooling and diversion structure for copper wire drawing. Background Technology

[0002] During the copper wire drawing process, a large amount of deformation heat and frictional heat are generated when the copper wire passes through the drawing die. Timely cooling is required to ensure the surface quality of the copper wire and the life of the die. Existing cooling methods mainly include spray cooling and immersion cooling, but both have obvious shortcomings. In spray cooling, the contact time between the coolant and the copper wire is short, resulting in poor cooling effect. In immersion cooling, the coolant is mostly in a static or laminar flow state, with limited heat exchange efficiency. More importantly, existing cooling systems have the following defects: each cooling station uses a single pipeline for unified coolant supply, and the flow rate at each point cannot be independently adjusted according to actual operating conditions, making it difficult to achieve differentiated and precise cooling; the flow guiding structure is mostly a straight flow channel, and the coolant flow state is mainly laminar, with a thick boundary layer and low heat transfer coefficient; the turbulence intensity is fixed and cannot be adaptively adjusted with changes in coolant temperature, causing unnecessary flow resistance loss at low temperatures and failing to meet the requirements for enhanced heat exchange at high temperatures; there is a lack of real-time temperature monitoring methods, making it difficult for operators to promptly grasp the temperature status of each station and make precise adjustments; moving parts mostly use sliding friction fits, resulting in severe wear and tear over long-term operation, and inconvenient disassembly and maintenance, leading to high operation and maintenance costs. Summary of the Invention

[0003] Therefore, in order to overcome the above-mentioned shortcomings, the present invention provides a copper wire drawing cooling diversion and guiding structure.

[0004] This invention is implemented by constructing a copper wire drawing cooling diversion and guiding structure. The device includes a wire drawing machine; a diversion valve array and a guiding structure are fixedly installed inside the frame of the wire drawing machine; the diversion valve array specifically consists of a one-way valve fixed to the side of the wire drawing machine frame and a connecting pipe connected to the outlet of the one-way valve, and the diversion valve array is connected to the side of the guiding structure through the connecting pipe; the guiding structure includes a connecting frame fixedly installed inside the wire drawing machine frame by bolts, and a guide cylinder assembly is fixedly installed in sections inside the connecting frame; a limit collar is fixedly installed between two adjacent sets of guide cylinder assemblies inside the connecting frame.

[0005] Preferably, the guide tube assembly includes a guide tube body that is segmented and fixedly disposed inside the connecting frame; a stop ring and a limiting sleeve with a limiting function are fixedly fixed at equal intervals on the inner wall of the guide tube body; and a turbulence core with a guiding function is rotatably installed inside the limiting sleeve.

[0006] Preferably, a blade hinge seat is fixedly installed on the surface of the turbulence core by bolts, and a thermally deformable blade assembly is fixedly installed on the rotating part of the blade hinge seat by bolts; a diffuser is provided at the left and right ends of the guide tube body, and a temperature sensing sleeve with data acquisition function is fixedly installed on the side of the diffuser by bolts.

[0007] Preferably, the limiting collar includes a combined ring body that is fixedly installed at the inlet of the guide tube body by bolts, and the combined ring body is formed into a complete circle and disposed at the inlet of the guide tube body by a fixing buckle; a replaceable panel is fixedly installed on the inner ring wall of the combined ring body by bolts, and a limiting hole is opened on the replaceable panel, and a ball bearing is rolled inside the limiting hole.

[0008] Preferably, the hot-deformable blade assembly is composed of a bimetallic sheet made up of an active layer and a passive layer, and the end of the hot-deformable blade assembly extends outward along the radial direction of the turbulence core; the surface of the hot-deformable blade assembly is also provided with turbulence grooves extending along the blade length direction.

[0009] Preferably, the temperature sensing sleeve is an annular sleeve fitted onto the outer wall of the guide tube body, with a gap between its inner wall and the outer wall of the guide tube body; the sleeve wall is provided with a plurality of temperature sensing holes evenly distributed along the circumference, and each temperature sensing hole is embedded with a thermistor.

[0010] Preferably, the inner wall of the guide tube body is further provided with a spiral guide groove that extends spirally along its axial direction, and the bottom of the spiral guide groove is flush with the inner ring surface of the stop ring.

[0011] The present invention has the following advantages: The present invention provides an improved copper wire drawing cooling and diversion structure, which, compared with similar equipment, has the following improvements: The present invention discloses a copper wire drawing cooling diversion and guiding structure, which realizes differentiated cooling requirements under multiple working conditions through a diversion valve. After the coolant enters the guide cylinder body, it is guided by the spiral guide groove to form a spiral flow that is close to the wall. At the same time, the turbulence core drives the hot-deformation blade assembly to generate self-rotating turbulence. The spiral flow and the rotating turbulence work together to form a composite turbulent field, which greatly improves the convective heat transfer coefficient. The hot-deformation blade assembly adopts a bimetallic structure of brass and Invar alloy. It automatically bends and deforms with the change of coolant temperature to adjust the turbulence intensity. At high temperature, the blades open to enhance heat transfer, and at low temperature, they close to reduce flow resistance, realizing fully passive adaptive adjustment without external energy. The turbulence grooves on the blade surface further destroy the boundary layer and enhance local disturbance. The temperature sensing sleeve is embedded with a thermistor to collect temperature data in real time and transmit it to an external monitoring device to form a closed-loop control to ensure the temperature stability of each station. Attached Figure Description

[0012] Figure 1This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the wire drawing machine, the flow divider valve, and the flow guiding structure of the present invention; Figure 3 This is a schematic diagram of the axial structure of the flow guiding structure of the present invention; Figure 4 This is a cross-sectional view of the flow guiding structure of the present invention; Figure 5 This is a schematic diagram of the axial structure of the limiting collar of the present invention.

[0013] Among them: wire drawing machine-1, flow divider valve row-2, flow guide structure-3, connecting frame-31, flow guide tube assembly-32, limiting collar-33, flow guide tube body-321, blocking ring-322, turbulence core-323, blade hinge seat-324, heat deformation blade group-325, diffuser-326, temperature sensing sleeve-327, combined ring body-331, fixing buckle-332, replaceable panel-333, ball bearing-334. Detailed Implementation

[0014] The following is in conjunction with the appendix Figures 1-5 The principles and features of the present invention are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0015] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on 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.

[0016] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0017] Example 1:

[0018] Please see Figures 1-5 The present invention provides a copper wire drawing cooling diversion and guiding structure, comprising a drawing machine 1, a diversion valve 2, and a guiding structure 3; The wire drawing machine 1 serves as the installation base for this invention. Its frame has a hollow internal structure to accommodate and fix the diversion valve 2 and the flow guiding structure 3. The frame of the wire drawing machine 1 is made of welded steel profiles and has sufficient structural strength and rigidity to withstand vibration and impact loads during the wire drawing process. The diversion valve array 2 is fixedly installed on the side of the frame of the wire drawing machine 1. The diversion valve array 2 is specifically composed of multiple check valves and connecting pipes connected to the outlet of the check valves. The inlet of each check valve is connected to the external coolant supply pipeline, and the outlet is connected to the side of the flow guiding structure 3 through the connecting pipe. The check valve adopts a spring return structure, including a valve body, a valve core, a return spring, and an adjusting screw sleeve. One end of the valve body is the inlet and the other end is the outlet. The valve core is slidably installed inside the valve body. The return spring is sleeved outside the valve core, with one end abutting against the shoulder of the valve core and the other end abutting against the end face of the adjusting screw sleeve. The adjusting screw sleeve is threadedly connected to the end of the valve body away from the inlet. By rotating the adjusting screw sleeve, the preload of the return spring can be adjusted, thereby changing the opening pressure of the check valve and realizing independent adjustment of the coolant flow of different branches. The flow guiding structure 3 is the core component of this invention, including a connecting frame 31, a flow guiding cylinder assembly 32, and a limiting collar 33. The connecting frame 31 is fixedly installed inside the frame of the wire drawing machine 1 by bolts. The connecting frame 31 adopts a frame structure and extends along the length direction of the wire drawing machine 1. It has multiple installation stations inside for segmented fixing of the flow guiding cylinder assembly 32. The flow guiding cylinder assembly 32 is segmented and fixed inside the connecting frame 31, and a limiting collar 33 is fixedly installed between two adjacent sets of flow guiding cylinder assemblies 32. The number of flow guiding cylinder assemblies 32 is determined according to the number of cooling stations of the wire drawing machine, generally 3 to 8 sets. Each flow guiding cylinder assembly 32 is arranged sequentially along the length direction of the wire drawing machine 1. The copper wire passes through the center of each flow guiding cylinder assembly 32, and the coolant contacts the surface of the copper wire inside the flow guiding cylinder assembly 32 to achieve cooling. The guide tube assembly 32 includes a guide tube body 321, a stop ring 322, a turbulence core 323, a blade hinge seat 324, a heat-deformation blade assembly 325, a diffuser 326, and a temperature sensing sleeve 327. The guide tube body 321 is a segmented cylindrical component fixedly installed inside the connecting frame 31. The guide tube body 321 is made of stainless steel or copper alloy, with a smooth inner wall. Its inner diameter is determined according to the copper wire specifications and coolant flow rate, generally 50~150mm. Flange connection parts are provided at both ends of the guide tube body 321 for connection with adjacent components or the limiting sleeve 33. A spiral extending along its axial direction is provided on the inner wall of the guide tube body 321. A spiral guide channel is used to guide the coolant to form a spiral flow inside the guide tube body 321, increasing the contact time and contact area between the coolant and the copper wire surface. A retaining ring 322 is an annular component equidistantly fixed on the inner wall of the guide tube body 321. Multiple retaining rings 322 are equidistantly distributed along the axial direction of the guide tube body 321. The inner diameter of the retaining ring 322 is smaller than the inner diameter of the guide tube body 321, limiting the axial movement range of the turbulence core 323 inside the guide tube body 321. The inner ring surface of the retaining ring 322 is flush with the bottom of the spiral guide channel, ensuring that the coolant does not experience significant flow obstruction when flowing through the retaining ring 322. The turbulence core 323 is rotatably mounted inside the limiting collar 33. The turbulence core 323 is a cylindrical or conical component, with an annular gap between its outer wall and the inner wall of the guide tube body 321 for coolant to pass through. A spiral guide rib that fits with the spiral guide groove is fixedly provided on the outer wall of the turbulence core 323. The spiral guide rib slides and is embedded in the spiral guide groove. When the turbulence core 323 moves along the axial direction of the guide tube body 321, the spiral guide rib slides along the spiral guide groove, driving the turbulence core 323 to rotate around its own axis, thereby realizing the turbulence core 323... 23 Rotational movement inside the guide tube body 321; the blade hinge seat 324 is fixedly installed on the surface of the turbulence core 323 by bolts; there are multiple blade hinge seats 324, which are evenly distributed along the circumference and axial direction of the turbulence core 323; the blade hinge seat 324 includes a fixed part and a rotating part, the fixed part is fixedly connected to the turbulence core 323 by bolts, and the rotating part is hinged to the fixed part by a rotating shaft, and the rotating part can swing around the rotating shaft within a certain angle range; the rotating part of the blade hinge seat 324 is provided with mounting holes for fixing and installing the heat-deformed blade assembly 325; The hot-deformable blade assembly 325 is bolted to the rotating part of the blade hinge seat 324. The hot-deformable blade assembly 325 is composed of a bimetallic sheet made of an active layer and a passive layer. The active layer is a brass sheet with a high coefficient of expansion, and the passive layer is an Invar alloy sheet with a low coefficient of expansion. The root of the hot-deformable blade assembly 325 is bolted to the rotating part of the blade hinge seat 324, and its end extends outward along the radial direction of the turbulence core 323. The surface of the hot-deformable blade assembly 325 is also provided with turbulence grooves extending along the blade length direction. These turbulence grooves are used to increase the turbulence effect of the blade surface on the coolant. When the coolant temperature rises, the hot-deformable blade assembly 325 bends and deforms due to the difference in thermal expansion of the two metal layers, and the blade tips open outward, increasing the turbulence intensity on the coolant. When the coolant temperature drops, the hot-deformable blade assembly 325 returns to its original shape, and the blades retract, reducing flow resistance. The diffuser tubes 326 are respectively disposed at the left and right ends of the guide tube body 321. The diffuser tube 326 is a gradually expanding cylindrical structure, with the diameter of its inlet end being the same as the diameter of the guide tube body 321 and the diameter of its outlet end being larger than the diameter of the inlet end. The diffuser tube 326 is used to gradually decelerate and diffuse the coolant passing through the guide tube body 321 before exporting it, thereby reducing energy loss and eddies at the coolant outlet. The temperature sensing sleeve 327 is fixedly installed on the side of the diffuser 326 by bolts. The temperature sensing sleeve 327 is an annular sleeve fitted on the outer wall of the guide tube body 321. A gap is left between its inner wall and the outer wall of the guide tube body 321. This gap is used for heat insulation and installation of sensor circuits. Multiple temperature sensing holes are evenly distributed around the circumference on the cylinder wall of the temperature sensing sleeve 327. Each temperature sensing hole is embedded with a thermistor for real-time acquisition of the temperature data of the coolant inside the guide tube body 321. A signal output interface is also fixedly installed on the outer wall of the temperature sensing sleeve 327. This signal output interface is electrically connected to an external temperature monitoring device through a wire.

[0019] Example 2:

[0020] Please see Figures 1-5 The present invention provides a copper wire drawing cooling diversion and guiding structure. Compared with Embodiment 1, this embodiment further includes: a limiting collar 33 comprising a combined ring body 331, a fixing buckle 332, a replaceable panel 333, and a ball bearing 334; the combined ring body 331 is fixedly installed at the inlet of the guide tube body 321 by bolts; the combined ring body 331 is a split ring structure, composed of two or more arc-shaped ring segments, which facilitates installation and disassembly in the narrow space at the inlet of the guide tube body 321; the fixing buckle 332 is used to connect and fix the arc-shaped ring segments of the combined ring body 331, so that the combined ring body 331 forms a complete circle and is set at the inlet of the guide tube body 321; the fixing buckle 332 adopts a snap-on or bolt-locking structure to ensure that the combined ring body 331 will not loosen during operation; The replaceable panel 333 is fixedly installed on the inner ring wall of the combined ring 331 by bolts. The replaceable panel 333 is an annular plate-shaped component with a limiting hole in the center. The diameter of the limiting hole is adapted to the outer diameter of the turbulence core 323. The replaceable panel 333 is made of wear-resistant material. When it wears out after long-term use, it can be replaced by removing the bolts without replacing the entire combined ring 331, thus reducing maintenance costs. The balls 334 are rolled inside the limiting hole of the replaceable panel 333. There are multiple balls 334, which are evenly distributed along the circumference of the limiting hole. Each ball 334 can roll freely on the wall surface of the limiting hole. When the turbulence core 323 passes through the limiting hole, the balls 334 form rolling contact with the outer wall of the turbulence core 323, which not only provides radial limiting for the turbulence core 323, but also transforms the sliding friction between the turbulence core 323 and the limiting collar 33 into rolling friction, greatly reducing frictional resistance and wear.

[0021] The working principle of the copper wire drawing cooling diversion and guiding structure described above is as follows: The external coolant supply pipeline delivers coolant to the inlet of each check valve of the flow divider 2; the coolant flows into the connecting pipe through the outlet of the check valve, and then is delivered to each flow guide cylinder assembly 32 of the flow guide structure 3 to adjust the coolant flow of each branch and realize flow divider control. After the coolant enters the guide tube body 321, it forms a spiral flow along the inner wall of the guide tube body 321 under the guidance of the spiral guide groove. The spiral-flowing coolant flows closely against the inner wall of the guide tube body 321 under the action of centrifugal force, and fully contacts the surface of the copper wire passing through the center of the guide tube body 321 to achieve efficient heat exchange. At the same time, the coolant pushes the turbulence core 323 to move along the axial direction of the guide tube body 321. The cooperation between the spiral guide rib and the spiral guide groove drives the turbulence core 323 to rotate around its own axis, so that the thermally deformable blade assembly 325 generates rotating turbulence inside the guide tube body 321, further enhancing the convective heat transfer between the coolant and the copper wire. The hot-deformed blade assembly 325 is immersed in the coolant, and its bimetallic structure senses the coolant temperature in real time. When the wire drawing speed increases, the heat generated by the copper wire increases, and the coolant temperature rises, the active layer brass sheet and the passive layer Invar alloy sheet of the hot-deformed blade assembly 325 bend and deform due to their different coefficients of thermal expansion. The blade tips open outward along the radial direction of the turbulence core 323, increasing the degree of disturbance to the coolant flow and thus enhancing the heat exchange effect. When the wire drawing speed decreases, the heat generated decreases, and the coolant temperature drops, the hot-deformed blade assembly 325 returns to its original shape, and the blades automatically retract, reducing unnecessary flow resistance. The turbulence grooves on the surface of the hot-deformed blade assembly 325 further increase the disturbance to the coolant and improve the heat exchange efficiency. The thermistor embedded in the temperature sensing sleeve 327 collects the temperature data of the coolant inside the guide tube body 321 in real time, and transmits the temperature signal to the external temperature monitoring device through the signal output interface; the operator can understand the cooling status of each cooling station in real time based on the temperature monitoring data, and adjust the coolant flow rate by adjusting the one-way valve of the diversion valve 2 when necessary. After heat exchange, the coolant flows from the end of the guide tube body 321 into the diffuser tube 326. It gradually decelerates and diffuses in the gradually expanding channel of the diffuser tube 326 before being discharged and entering the coolant recovery system for recycling.

[0022] This invention provides an improved copper wire drawing cooling diversion and guiding structure, which achieves differentiated cooling requirements under various working conditions through a diversion valve array. After the coolant enters the guide cylinder body, it is guided by a spiral guide groove to form a spiral flow that closely adheres to the wall surface. At the same time, it drives the turbulence core to generate self-rotating turbulence by driving the thermally deformable blade assembly. The spiral flow and the rotating turbulence work together to form a composite turbulent field, which significantly improves the convective heat transfer coefficient. The thermally deformable blade assembly adopts a bimetallic structure of brass and Invar alloy, which automatically bends and deforms with the change of coolant temperature to adjust the turbulence intensity. At high temperatures, the blades open to enhance heat transfer, and at low temperatures, they close to reduce flow resistance, achieving fully passive adaptive adjustment without the need for external energy. The turbulence grooves on the blade surface further disrupt the boundary layer and enhance local disturbance. The temperature sensing sleeve is embedded with a thermistor to collect temperature data in real time and transmit it to an external monitoring device to form a closed-loop control to ensure the temperature stability of each station.

[0023] The above description shows and illustrates the basic principles, main features, and advantages of the present invention. Standard parts used in the present invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0024] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cooling and diversion structure for copper wire drawing, comprising a wire drawing machine (1); characterized in that: The wire drawing machine (1) is fixedly equipped with a diversion valve row (2) and a flow guiding structure (3); the diversion valve row (2) is specifically composed of a one-way valve fixed on the side of the wire drawing machine (1) and a connecting pipe connected to the outlet of the one-way valve, and the diversion valve row (2) is connected to the side of the flow guiding structure (3) through the connecting pipe; The flow guiding structure (3) includes a connecting frame (31) that is fixedly installed inside the frame of the wire drawing machine (1) by bolts, and the connecting frame (31) is provided with flow guiding cylinder assemblies (32) in sections; a limiting collar (33) is fixedly provided between two adjacent sets of flow guiding cylinder assemblies (32) inside the connecting frame (31).

2. The copper wire drawing cooling diversion and guiding structure according to claim 1, characterized in that: The guide tube assembly (32) includes a guide tube body (321) that is segmented and fixed inside the connecting frame (31); a stop ring (322) and a limiting collar (33) with limiting function are fixed at equal intervals on the inner wall of the guide tube body (321); a turbulence core (323) with guiding function is rotatably installed inside the limiting collar (33).

3. The copper wire drawing cooling diversion and guiding structure according to claim 2, characterized in that: The turbulence core (323) is fixedly mounted with a blade hinge seat (324) by bolts, and the rotating part of the blade hinge seat (324) is fixedly mounted with a heat-deformable blade assembly (325) by bolts; the left and right ends of the guide tube body (321) are respectively provided with a diffuser tube (326), and the side of the diffuser tube (326) is fixedly mounted with a temperature sensing sleeve (327) with data acquisition function by bolts.

4. The copper wire drawing cooling diversion and guiding structure according to claim 3, characterized in that: The limiting collar (33) includes a combined ring (331) that is fixedly installed at the opening of the guide tube body (321) by bolts, and the combined ring (331) is formed into a complete circle and set at the opening of the guide tube body (321) by a fixing buckle (332); a replaceable panel (333) is fixedly installed on the inner ring wall of the combined ring (331) by bolts, and a limiting hole is opened on the replaceable panel (333), and a ball (334) is rolled inside the limiting hole.

5. The copper wire drawing cooling diversion and guiding structure according to claim 4, characterized in that: The heat-deformable blade assembly (325) is composed of a bimetallic sheet made of an active layer and a passive layer. The end of the heat-deformable blade assembly (325) extends outward along the radial direction of the turbulence core (323). The surface of the heat-deformable blade assembly (325) is also provided with turbulence grooves extending along the blade length direction.

6. The copper wire drawing cooling diversion and guiding structure according to claim 5, characterized in that: The temperature sensing sleeve (327) is an annular sleeve fitted on the outer wall of the guide tube body (321), with a gap between its inner wall and the outer wall of the guide tube body (321); the temperature sensing sleeve (327) has multiple temperature sensing holes evenly distributed along the circumference on its cylinder wall, and each temperature sensing hole is embedded with a thermistor.

7. The copper wire drawing cooling diversion and guiding structure according to claim 6, characterized in that: The inner wall of the guide tube body (321) is also provided with a spiral guide groove that extends spirally along its axial direction, and the bottom of the spiral guide groove is flush with the inner ring surface of the stop ring (322).

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