Multi-pass wire drawing equipment

Abstract

The utility model relates to the technical field of drawing equipment, in particular to multi-pass wire drawing equipment. The equipment comprises a drawing cone pulley mechanism and a heating furnace, wherein the drawing cone pulley mechanism comprises a cone pulley group, and a wire drawing die frame and a first guide wheel group which are sequentially arranged on one side of the cone pulley group; the cone pulley group comprises N cone pulleys which are arranged in parallel; the wire-drawing die frame comprises M wire-drawing dies; the first guide wheel group comprises M first guide wheels which are arranged in one-to-one correspondence with the wire-drawing dies; the wire is guided by the first guide wheel group, penetrates through the die orifice of the wire-drawing die, is wound on the cone pulley and is rewound on the first guide wheel group, and multi-pass drawing is performed by repeating the steps; wherein the total drawing pass is M, M is larger than or equal to 2, N is larger than or equal to 2 and smaller than or equal to M, and at least one pass of wire drawing is conducted on each cone pulley 110. The drawing cone pulley mechanism solves the problem that due to the fact that the number of drawing passes is increased, the sliding coefficient difference between the first pass and the last pass is too large, and wires are broken, and the drawing efficiency of a single machine is remarkably improved.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 2023108301082 and the invention title "A Drawing Tower Pulley Mechanism, a Heating Furnace, and a Multi-pass Wire Drawing Equipment" submitted to the Chinese Patent Office on July 7, 2023. The entire content thereof is incorporated herein by reference. Technical Field

[0002] The utility model relates to the technical field of wire drawing equipment, and particularly relates to a multi-pass wire drawing equipment. Background Art

[0003] High-strength tungsten alloy wires have gradually replaced carbon steel wires in fields such as diamond wire cutting, precision mechanical ropes, cut-resistant protection, and screen printing due to their comprehensive excellent properties such as higher strength (tensile strength exceeding 5500 MPa) and finer wire diameters (diameter less than 0.037 mm), and have been widely used.

[0004] Currently, the drawing of high-strength and low-diameter metal wire materials (tungsten wires) mainly uses a sliding drawing device. However, the existing sliding drawing device has the following problems:

[0005] (1) As Figures 1-3 shown, the current sliding multi-pass drawing device uses a segmented stepped tower pulley. Multi-pass wire materials are wound around the same segmented stepped tower pulley. Due to the design requirements of the tower pulley steps and the coaxiality requirements, the number of drawing passes is generally 6 or 8, not exceeding 10 passes, and more passes cannot be integrated, resulting in low single-pass drawing efficiency.

[0006] (2) As Figures 4-6 shown, the current sliding drawing device uses a straight cylindrical tower pulley. Multi-pass wire materials are wound around the same straight cylindrical tower pulley. From the first pass to the last pass, the wire diameter specifications of the wire materials gradually become thinner. Since the rotation speed of the straight cylindrical tower pulley is the same, and the wire diameter of the wire materials gradually becomes thinner, the difference in slip amount between passes becomes larger; after the number of drawing passes of the straight cylindrical sliding drawing exceeds 7 passes, due to the too large difference in sliding coefficients between the first pass and the last pass, it is extremely easy to break wires frequently; limited by the above reasons, the straight cylindrical tower pulley generally does not exceed 10 passes, and the single-pass drawing efficiency is not high. Summary of the Utility Model

[0007] To solve the problems in the prior art mentioned in the above background art, the utility model provides a multi-pass wire drawing equipment, and its technical solution is as follows:

[0008] The multi-pass wire drawing equipment includes a drawing tower wheel mechanism and a heating furnace for heating each pass of wire; the drawing tower wheel mechanism includes a tower wheel group, a drawing die frame and a first guide wheel group sequentially arranged on one side of the tower wheel group; the tower wheel group includes N tower wheels arranged in parallel; the drawing die frame includes M drawing dies, and the first guide wheel group includes M first guide wheels arranged in one-to-one correspondence with the drawing dies; the wire is guided by the first guide wheel group, passes through the die mouth of the drawing die, is wound around the tower wheel and is wound back to the first guide wheel group, and multiple passes of drawing are performed reciprocatingly; wherein the total number of drawing passes is M, M is greater than or equal to 2, N is greater than or equal to 2 and less than or equal to M, and each tower wheel 110 performs at least one wire drawing pass.

[0009] In some embodiments, the front tower wheel is provided with a giving way mechanism for the wire material wound on the rear tower wheel to pass through, and the front tower wheel is closer to the drawing die frame than the rear tower wheel.

[0010] In some embodiments, the giving way mechanism is a thin rod; the front tower wheel includes the thin rod and a tower wheel body, so that the wire material wound on the rear tower wheel can pass through the space above the thin rod.

[0011] In some embodiments, the step pulley is a straight-cylinder step pulley and / or a segmented stepped step pulley.

[0012] In some embodiments, the tower wheel group includes a segmented stepped tower wheel; a second guide wheel group is provided between the tower wheel group and the drawing die frame; the second guide wheel group includes M second guide wheels arranged in one-to-one correspondence with the drawing dies.

[0013] In some embodiments, the heating furnace includes a furnace shell and a heating component disposed in a furnace chamber of the furnace shell; the heating component includes Y heating components with independent temperature control settings, where Y is greater than or equal to.

[0014] In some embodiments, the heating assembly is detachably connected to the furnace shell.

[0015] In some embodiments, each of the heating components includes a heating wire body and a temperature sensing component for measuring temperature; the heating wire body and the temperature sensing component are both connected to a control system.

[0016] In some embodiments, each of the heating wire bodies extends along the axial direction of the wire material, so that Y heating wire bodies are arranged in parallel in the furnace; the heating wire bodies are located above the wire material and / or below the wire material.

[0017] In some embodiments, a glass tube is provided on the outside of the heating wire body; a gap is provided between the glass tube and the heating wire body, and the gap can be used to fill gas.

[0018] In some embodiments, the inner furnace of the furnace body shell is filled with a protective gas.

[0019] In some embodiments, it further includes a tension control mechanism for adjusting the wire tension; the heating furnace is arranged between the wire drawing die holder and the first guide wheel set, and the tension control mechanism is arranged on the side of the first guide wheel set away from the wire drawing die holder; wherein, after the wire passes through the tension control mechanism and the first guide wheel set in sequence, it then passes through the furnace chamber of the heating furnace and the wire drawing die of the wire drawing die holder in sequence, and is wound around the capstan, and multiple passes of wire drawing are carried out reciprocally in this way.

[0020] Compared with the prior art, the present utility model has the following beneficial effects:

[0021] In the multi-pass wire drawing equipment of the present application, the drawing capstan mechanism adopts the method of arranging multiple capstans side by side to form a capstan group. Through the corresponding cooperation between the capstan group and the wire drawing die holder, and the winding cooperation between the first guide wheel set and the capstan group, multiple passes of wire are distributed on multiple capstans, solving the problem of wire breakage caused by too large a difference in the sliding coefficients of the first and last passes due to an increase in the number of drawing passes. The single-pass drawing efficiency is significantly improved; and, due to the winding cooperation design of the capstan group, the wire drawing die holder, and the first guide wheel set, on the basis of ensuring that multiple passes of wire are distributed on multiple capstans, multiple passes of wire drawing are integrated together, effectively saving the equipment space and the wire production space. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a front view of a multi-pass wire drawing device with a segmented stepped capstan in the prior art;

[0024] Figure 2 It is a top view of a multi-pass wire drawing device with a segmented stepped capstan in the prior art;

[0025] Figure 3 It is a three-dimensional view of a multi-pass wire drawing device with a segmented stepped capstan in the prior art;

[0026] Figure 4 It is a front view of a multi-pass wire drawing device with a straight cylindrical capstan in the prior art;

[0027] Figure 5 It is a top view of a multi-pass wire drawing device with a straight cylindrical capstan in the prior art;

[0028] Figure 6 It is a three-dimensional view of an existing multi-pass drawing device with a straight cylindrical cone pulley;

[0029] Figure 7 It is a top view of an existing multi-pass drawing device with a single heating wire heating furnace;

[0030] Figure 8 It is a three-dimensional view of an existing multi-pass drawing device with a single heating wire heating furnace;

[0031] Figure 9 It is a front view of the multi-pass drawing device provided in Embodiment 1;

[0032] Figure 10 It is a top view of the multi-pass drawing device provided in Embodiment 1;

[0033] Figure 11 It is a three-dimensional view of the multi-pass drawing device provided in Embodiment 1;

[0034] Figure 12 It is a top view of the cone pulley group and the wire drawing die holder in Embodiment 1;

[0035] Figure 13 It is a three-dimensional view of the cone pulley group and the wire drawing die holder in Embodiment 1;

[0036] Figure 14 It is a top view of the heating furnace in Embodiment 1;

[0037] Figure 15 It is a three-dimensional view of the heating furnace in Embodiment 1;

[0038] Figure 16 It is a three-dimensional view of the tension control mechanism in Embodiment 1;

[0039] Figure 17 It is a top view of the cone pulley group and the wire drawing die holder in Embodiment 2;

[0040] Figure 18 It is a three-dimensional view of the cone pulley group and the wire drawing die holder in Embodiment 2;

[0041] Figure 19 It is a top view of the cone pulley group and the wire drawing die holder in Embodiment 3;

[0042] Figure 20 It is a three-dimensional view of the cone pulley group and the wire drawing die holder in Embodiment 3;

[0043] Figure 21 It is a front view of the heating furnace in Embodiment 4;

[0044] Figure 22 It is a top view of the heating furnace in Embodiment 4;

[0045] Figure 23 Is a perspective view of the heating furnace in Embodiment 4;

[0046] Figure 24 Is a schematic structural view of the heating wire assembly in Embodiment 5;

[0047] Figure 25 Is a schematic structural view of the heating wire assembly in Embodiments 6 - 8;

[0048] Figure 26 Is a top view of the multi - pass drawing device of the heating wire assembly in Embodiment 9;

[0049] Figure 27 Is a top view of the capstan in Embodiment 9;

[0050] Figure 28 Is a top view of the capstan and the wire drawing die holder in Embodiment 10.

[0051] Reference numerals:

[0052] 10 Capstan group, 20 Wire drawing die holder, 30 First guide wheel group, 40 Heating furnace, 50 Tension control mechanism, 60 Wire feeding mechanism, 70 Rewinding mechanism, 110 Capstan, 111 Thin rod, 112 Capstan body, 113 Region, 113a First region, 113b Second region, 113c Third region, 210 Wire drawing die, 310 First guide wheel, 410 Furnace body shell, 420 Heating component, 430 Furnace chamber, 440 Glass tube, 421 Heating wire body, 422 Temperature measuring point, 510 Tension adjusting component, 511 Support wheel, 512 Pressure wheel, 112a Segmented stepped capstan, 112b Straight - tube capstan, 1 First temperature zone, 2 Second temperature zone, 3 Third temperature zone, 4 Fourth temperature zone, 5 Fifth temperature zone, 6 Sixth temperature zone, 7 Seventh temperature zone, 8 Eighth temperature zone, 9 Ninth temperature zone. Detailed implementation manners

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0054] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0055] The present utility model provides a multi-pass wire drawing device as shown in Figures 9-16 Example 1, Figures 17-18 Example 2, Figures 19-20 Example 3, Examples 21 - 23, Example 4, Figure 24 Example 5, Figure 25 Examples 6 - 8, which includes a drawing tower wheel mechanism, a heating furnace 40, and a tension control mechanism 50 for adjusting the wire tension.

[0056] For the drawing tower wheel mechanism

[0057] For the design of the drawing tower wheel mechanism one:

[0058] As Figures 9-16 Example 1, Figures 17-18 Example 2, Figures 19-20 As shown in Example 3, the multi-pass drawing tower wheel mechanism includes a tower wheel group 10, a wire drawing die holder 20 and a first guide wheel group 30 arranged in sequence on one side of the tower wheel group 10; the tower wheel group 10 includes N tower wheels 110 arranged in parallel; the wire drawing die holder 20 includes M wire drawing dies 210; the wire is guided by the first guide wheel group 30, passes through the die orifice of the wire drawing die 210, and then winds around the tower wheel 110 and returns to the first guide wheel group 30, and so on for multi-pass drawing; where the total number of drawing passes is M, M is greater than or equal to 2, N is greater than or equal to 2 and less than or equal to M, and each tower wheel 110 performs at least one pass of wire drawing.

[0059] Specifically, as Figures 9-16 shown, during the drawing process, the wire in the first pass is guided by the first guide wheel group 30, passes through the die orifice of the wire drawing die 210, winds around the tower wheel 110 and returns to the first guide wheel group 30. After returning, like the first pass, the second pass of drawing starts; and so on until the last pass.

[0060] When in use, wires of multiple passes are divided into multiple groups and drawn by multiple tower wheels 110 respectively. For example, in the present embodiment 1, the total number of passes is eight, which are divided into two groups, with four passes in each group. The wires of the first to fourth passes are drawn on the first tower wheel 110, and so on. The fifth and eighth passes are drawn on the second tower wheel 110.

[0061] In summary, the drawing tower wheel mechanism of the utility model adopts a method of arranging multiple tower wheels 110 in parallel to form a tower wheel group 10. Through the corresponding cooperation between the tower wheel group 10 and the wire drawing die frame 20, and the winding cooperation between the first guide wheel group 30 and the tower wheel group 10, multiple passes of wire materials are distributed on multiple tower wheels 110. Since each independent tower wheel 110 can independently adjust the rotation speed, the problem of wire breakage caused by excessive difference in sliding coefficients of the first and last passes due to an increase in the number of drawing passes is solved, and the single-machine drawing efficiency is improved.

[0062] In addition, due to the winding matching design of the tower wheel group 10, the drawing die frame 20, and the first guide wheel group 30, multiple drawing passes are integrated together on the basis of ensuring that multiple wires are distributed on multiple tower wheels 110, effectively saving equipment space and wire production space.

[0063] It should be noted that: in this embodiment 1, two parallel arranged step pulleys 110 are provided, the total number of drawing passes and the number of wire drawing dies 210 are 8 (M=2), and the 8 wires are divided into 2 groups to be drawn through the two step pulleys 110; according to the above design concept, the number of step pulleys 110 and the number of wires drawn on each step pulley 110 can be adaptively adjusted according to the total number of drawing passes M. Moreover, it is not limited to the same number of wires in each group, for example, 8 wires can be divided into 2 groups and drawn on different step pulleys 110, one group has 3 passes and the other group has 5 passes, including but not limited to the embodiment 1 scheme, preferably, the wire drawing passes on each step pulley 110 do not exceed eight.

[0064] Preferably, if Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 As shown in Embodiment 3, the front pulley 110 is provided with a giving way mechanism for the wire material wound on the rear pulley 110 to pass through, and the front pulley 110 is closer to the wire drawing die frame 20 than the rear pulley 110 .

[0065] Preferably, if Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 As shown in Example 3, the giving way mechanism is a thin rod 111 ; the preceding tower wheel 110 includes the thin rod 111 and a tower wheel body 112 , so that the wire material wound on the following tower wheel 110 can pass through the space above the thin rod 111 .

[0066] like Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 As shown in Example 3, when in use, the diameter of the thin rod 111 is smaller than the diameter of the tower wheel body 112 (in Example 2-3, a segmented stepped tower wheel 112a is provided, and the diameter of the thin rod 111 is smaller than the minimum diameter of the tower wheel body 112). This design allows the wire material passing through the die opening of the wire drawing die 210 to pass through the space above the thin rod 111 and be wound around the next tower wheel 110.

[0067] It should be noted that in the present embodiments 1-3, the yielding mechanism is a thin rod 111, and the step pulley 110 is composed of the thin rod 111 and the step pulley body 112, so that the wire can pass through the gap above the thin rod 111 of the previous step pulley 110; according to the above design concept, other schemes that can achieve the above effects can also be adopted, for example, Figure 28 In the staggered design of the tower pulley 110 shown in Example 10, N of the tower pulleys 110 are staggered along their axial direction so that the wire wound on the tower pulley 110 does not pass through the area where the adjacent tower pulley 110 is located; for example, a groove is provided on the upper part of a partial area of ​​the previous tower pulley 110 so that the wire wound on the next tower pulley 110 can pass through the groove of the previous tower pulley 110, including but not limited to the embodiment scheme.

[0068] Preferably, if Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 As shown in Example 3, the first guide wheel group 30 includes M first guide wheels 310 arranged in a one-to-one correspondence with the wire drawing dies 210.

[0069] When in use, each pass of wire is equipped with a first guide wheel 310 to separate each pass, which is convenient and practical for line alignment and wire buffering of each pass.

[0070] Preferably, the step pulley 110 is a straight-cylinder step pulley 112b and / or a segmented stepped step pulley 112a.

[0071] like Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 As shown in the third embodiment, the plurality of step pulleys 110 in the step pulley assembly 10 may be any combination of a straight-cylinder step pulley 112b and a segmented stepped step pulley 112a.

[0072] Preferably, when the step pulley assembly 10 includes a segmented stepped step pulley 110a, a second guide pulley assembly (not shown) is provided between the step pulley assembly 10 and the drawing die frame 20. Preferably, the second guide pulley assembly includes M second guide pulleys corresponding to the drawing dies 210 one by one.

[0073] After the wire rod passes through the wire drawing die 210, there is a height difference in the stepped tower pulleys 110a at different passes. The second guide pulley is used for guiding to adapt to the height difference from the wire drawing die 210 to the stepped tower pulleys 110a at different passes, so as to improve the drawing effect.

[0074] Regarding the design two of the drawing tower pulley mechanism:

[0075] Such as Figures 26-27 As shown in Embodiment 9, it includes a tower pulley 110 and a wire drawing die holder 20; the wire drawing die holder 20 includes M wire drawing dies 210; the surface of the tower pulley 110 is axially divided into at least Z section areas 113; wherein, the surface roughness of each section area 113 is different, so that the surface friction coefficient of each section area 113 is different; wherein, the total number of drawing passes is M, M is greater than or equal to 2, Z is greater than or equal to 2 and less than or equal to M; each area 113 performs at least one pass of wire rod drawing.

[0076] Preferably, it further includes a first guide pulley group 30 arranged on the side of the wire drawing die holder 20 away from the tower pulley 110; the wire rod is guided by the first guide pulley group 30, passes through the die orifice of the wire drawing die 210, winds around the tower pulley 110 and then winds back to the first guide pulley group 30, and so on for multiple passes of drawing.

[0077] Specifically, as Figures 26-27 shown, during the drawing process, the wire rod of the first pass is guided by the first guide pulley group 30, passes through the die orifice of the wire drawing die 210, winds around the tower pulley 110 and then winds back to the first guide pulley group 30. After winding back, like the first pass, the second pass of drawing starts; and so on until the last pass.

[0078] Among them, during use, the wire rods of multiple passes are divided into Z groups and are respectively arranged on Z different roughness area 113 of the tower pulley 110, and the wire rod is drawn by winding on each area 113 of the tower pulley 110. For example: in this Embodiment 9, the total number of passes is eight, divided into three groups (Z = 3), the 1st - 3rd passes wind around the first area 113a, the 4th - 5th passes wind around the second area 113b, and the 6th - 8th passes wind around the third area 113c. And from the area 113 where the first pass is located to the area 113 where the last pass is located, the roughness increases from Ra0.05 to Ra0.8.

[0079] In summary, in the drawing tower pulley mechanism of the present utility model, the tower pulley 110 is designed with at least Z regions 113 of different roughness. The multi-pass wire is drawn on multiple regions 113 of different roughness of the tower pulley 110, so that at the same rotation speed of the tower pulley 110, the friction coefficient between each region 113 and the wire can be adjusted. Among them, although the Z regions 113 are located on the surface of the same tower pulley 110, due to the different roughness of different regions 113, the friction coefficient between each region 113 and the wire can be adjusted, thus solving the problem of wire breakage caused by too large a difference in the sliding coefficient between the first and last passes due to an increase in the number of drawing passes.

[0080] For the existing segmented stepped tower pulley 110, due to the design requirements of the tower pulley 110 steps and the coaxiality requirements, the number of drawing passes is generally 6 or 8, not exceeding 10; while the design of the tower pulley 110 divided into at least Z regions 113 of different roughness is not limited by the design requirements of the tower pulley steps and the coaxiality requirements, and can be carried out according to the total number of drawing passes M, and the number Z of regions 113 on the surface of the tower pulley 110 and the roughness of each region 113 can be adaptively adjusted to adapt to the processing of more drawing passes.

[0081] Moreover, through the corresponding cooperation between the tower pulley 110 and the wire drawing die holder 20, and the winding cooperation between the first guide wheel group 30 and the tower pulley 110, while ensuring that the multi-pass wire is distributed on multiple regions 113 of different roughness, the multi-pass drawing is integrated together, effectively saving the equipment space and the wire production space.

[0082] Preferably, as Figures 26-27 shown in Embodiment 9, the surface of each section of the region 113 is coated with a different coating so that the surface roughness of each section of the region 113 is different. Optionally, the coating is one or a combination of alumina coating, zirconia coating, WC coating, chromium coating, titanium carbide coating, titanium nitride coating, carbonitride coating;

[0083] Preferably, the first guide wheel group 30 includes M first guide wheels 310 arranged corresponding to the wire drawing dies 210 one by one. During use, each pass of wire is equipped with a first guide wheel 310 to separate each pass, facilitating the alignment of each pass line and the wire passing buffer, which is convenient and practical.

[0084] It should be noted that:

[0085] According to the above design concept, for the number Z of regions 113 of different roughness, it can be adaptively adjusted according to the total number of drawing passes M, including but not limited to the scheme of Embodiment 9. Similarly, for the roughness design of different regions 113, it can be adaptively adjusted according to the total number of drawing passes M, including but not limited to the scheme with a surface roughness Ra of 0.05 - 0.8 described in Embodiment 9;

[0086] In the statements of "the pulley 110 is axially divided into at least Z section areas 113" and "N pulleys 110 are staggeredly distributed in the axial direction" described in this article, the axial direction refers to the rotation axis of the pulley 110.

[0087] According to the above design concept, other methods can also be adopted to make the surface roughnesses of the Z section areas 113 different, including but not limited to the above-mentioned scheme of coating different coatings. Similarly, according to the above design concept, existing coatings other than the above-mentioned alumina coating, zirconia coating, WC coating, chromium coating, titanium carbide coating, titanium nitride coating, and titanium carbonitride coating can also be used for coating to adjust the surface roughness of the area 113, including but not limited to the embodiment scheme.

[0088] Regarding the combination of the drawing pulley mechanism design one and the drawing pulley mechanism design two:

[0089] In addition, in the scheme of forming a pulley group 10 by using N pulleys 110 arranged in parallel, according to the above design concept, the pulley 110 in the pulley group 10 can also be set as Z section areas 113 with different surface roughnesses to further improve the single-machine drawing efficiency and drawing quality.

[0090] Such as Figures 9-16 Example 1, Figure 28 As shown in Example 10, the pulley structure is a pulley group 10; the pulley group 10 includes N pulleys 110 arranged in parallel. In the design scheme of the pulley group 10, at least one of the N pulleys 110 can be designed such that its surface is axially divided into at least Z section areas 113; the surface roughness of each section area 113 is different, so that the surface friction coefficient of each section area 113 is different; where M is greater than or equal to 3, N is greater than or equal to 2 and less than M, Z is greater than or equal to 2 and less than M, and each area 113 and each pulley 110 are used for drawing the wire at least once.

[0091] In the scheme of forming a pulley group 10 by using N pulleys 110 arranged in parallel, at least one pulley 110 in the pulley group 10 is designed to be set as Z section areas 113 with different roughnesses. During drawing, each area 113 and each pulley 110 are used for drawing the wire at least once. In this way, the equipment space utilization rate is higher, and the single-machine drawing efficiency and drawing quality are better; for example, Figure 28 in Example 10, one pulley 110 can be set as Z section areas 113 with different roughnesses.

[0092] Regarding the heating furnace 40:

[0093] Such as Figures 7-8As shown, currently a single heating wire / tube is used for heating in the heating furnace of the sliding multi-pass drawing device. When a single-strand heating wire is arranged for heating, the temperature in the middle of the furnace is slightly higher. Affected by heat exchange, the actual temperature at the edge is relatively low, and the temperature difference in each area of the furnace is large and cannot be adjusted, thus affecting the quality of the wire.

[0094] As is well known to those skilled in the art, from the first pass to the last pass, the wire diameter specification of the wire changes from thick to thin. The multi-mode wire drawing of the wire is hot drawing, and the wire drawing conditions have strict requirements for temperature control and adjustment. The process requirements for the heating temperature of the thick wire diameter wire and the thin wire diameter wire are inconsistent. Due to the above design of using a single heating wire / tube for heating, when the wire is in a heated state, the deformation force deviation of the wire during the die drawing process is large, resulting in serious wire breakage.

[0095] To solve the above problems, the heating furnace 40 structure is designed as follows:

[0096] As Figures 9-16 in Embodiment 1, 21 - 23, Embodiment 4, Figure 24 Embodiment 5, Figure 25 as shown in Embodiment 6 - 8, the heating furnace 40 for multi-pass drawing includes a furnace body shell 410 and a heating component disposed in the furnace chamber 430 of the furnace body shell 410; the heating component includes Y heating assemblies 420 with independent temperature control settings, where Y is greater than or equal to 2. Preferably, each heating assembly 420 includes a heating wire main body 421 and a temperature measuring and sensing member for measuring temperature; the heating wire main body 421 and the temperature measuring and sensing member are electrically connected to the control system. Preferably, each heating wire main body 421 extends along the threading direction of the wire, so that the heating wire main bodies 421 are arranged in parallel and in parallel in the furnace chamber 430, and the heating wire main body 421 is located above and / or below the wire.

[0097] Specifically, the heating furnace 40 adopts heating assemblies 420 with independent temperature control settings, and the temperature is controlled by the parallel design of multiple (greater than or equal to 2) heating wire main bodies 421, replacing the original method of controlling the temperature of the furnace chamber 430 of the heating furnace 40 by a single-strand heating wire as Figures 7-8 shown. Among them, as Figure 22 shown, each heating assembly 420 with independent temperature control settings has an independent temperature measuring and sensing member, and each heating wire main body 421 of each heating assembly 420 has at least one independent temperature measuring point 422 to perform temperature induction and feedback on the heating wire main body 421 of the heating assembly 420.

[0098] By adopting the solution of the present invention, the temperature of the heating wire main body 421 of the heating assembly 420 with independent temperature control settings can be changed according to the actual temperature requirement, and heating control can be performed on different positions of the furnace chamber 430 of the heating furnace 40:

[0099] Compared with Figure 7 the heating furnace 40 shown, which adopts a scheme where a heating wire is bent and arranged throughout the space of the furnace chamber 430, there are significant differences in various regions of the entire furnace chamber 430. Especially for the same wire, the temperature near the inlet and outlet of the furnace chamber 430 is significantly lower than that in the middle region. By adopting the design of the heating component 420 of the present utility model, when each wire is in the furnace chamber 430, the temperature uniformity of each section of each wire in the furnace chamber 430 can be improved, the temperature difference between the middle part and the inlet and outlet ends of the wire becomes smaller, and it can alleviate the problem of large temperature differences existing in the existing furnace chamber 430 as shown in Figure 8 Figure Figure 8

[0100] At the same time, since the specifications of the wire in each pass are different, and the process requirements for the heating temperature of the thick - gauge wire and the thin - gauge wire are inconsistent, by adopting Y independently temperature - controlled heating components 420, the temperatures of multiple heating components 420 can be controlled differently, which can meet the temperature gradient design requirements of multi - mode wire drawing, thereby effectively improving the quality of wire production. For example Figures 9-16 as shown in Embodiment 1, the present application adopts a parallel design with 4 heating components 420 in parallel. The wire passes above them are different, and each heating component 420 can be set at a different temperature to meet the heating temperature requirements of different passes of wire passing above.

[0101] In summary, by adopting the above design: designing multiple independently temperature - controlled heating components, the temperature of the heating component can be changed according to the actual temperature needs, heating control can be carried out for different positions of the heating furnace chamber, the temperature uniformity in the furnace chamber can be effectively improved, and at the same time, the temperature gradient design requirements of multi - mode wire drawing can be met, thereby effectively improving the quality of wire production.

[0102] It should be noted that

[0103] The statement “each of the heating wire bodies 421 extends along the axial direction of the wire, so that the Y heating wire bodies 421 are arranged in parallel and in parallel in the furnace chamber 430” described herein indicates that the extending direction of each heating wire body 421 is consistent with the threading direction (axial direction) of the wire, and its extending direction forms a quasi - parallel state with the wire, and a quasi - parallel state is formed among several heating wire bodies 421; but it does not mean that the heating wire body 421 is a straight line, nor does it mean that the shapes of several heating wire bodies 421 are the same. The shapes can be the same or different. For example, some are continuous circular arcs, some are continuous sawtooth shapes, as long as the extending directions of several heating wire bodies 421 are parallel;

[0104] The heating wire body 421 is preferably arranged above and / or below the wire; for example Figures 9-16 as shown in Embodiment 1, all the heating wire bodies 421 are arranged above the wire; asFigures 21-23 As shown in Embodiment 4, all the heating wire bodies 421 are arranged below the wire material; according to the above design concept, it is also possible to adopt a design in which a part of the heating wire bodies 421 are arranged above the wire material and a part of the heating wire bodies 421 are arranged below the wire material, including but not limited to the embodiment solutions.

[0105] In this Embodiment 1, the heating wire body 421, the temperature measuring and sensing element are connected to the control system to form temperature feedback and control: the temperature measuring and sensing element senses the temperature of the temperature measuring point 422 and feeds it back to the control system, and the control system controls the heating wire body 421 to adjust the temperature; this feedback and control process is a prior art, and its principle and mechanism will not be repeated here.

[0106] Preferably, as Figures 9-16 in Embodiment 1, Embodiments 21-23, Embodiment 4, Figure 24 Embodiment 5, Figure 25 as shown in Embodiments 6-8, the heating assembly 420 is detachably connected to the furnace body shell 410.

[0107] By setting the heating assembly 420 to be detachably connected to the furnace body shell 410, during use, people can adjust the heating temperature by changing the number of the heating assemblies 420, the diameter of each heating wire body 421, the bending amplitude, the spacing between the bending peaks and valleys, and the number of bending peaks (number of turns). By changing the number or the shape structure of the heating assembly 420 itself to adjust the temperature, it has strong flexibility, so that the heating control can be carried out for different positions of the furnace chamber 430, the temperature uniformity in the furnace chamber 430 can be effectively improved, and at the same time, the temperature gradient design requirements for multi-mode wire drawing can be met.

[0108] Preferably, as Figures 9-16 in Embodiment 1, Embodiments 21-23, Embodiment 4, Figure 24 Embodiment 5, Figure 25 as shown in Embodiments 6-8, the shape of the heating wire body 421 is one or a combination of more than one of a circular arc shape, a sawtooth shape, a shaving tooth shape, a continuous circular arc shape, a continuous sawtooth shape, and a continuous shaving tooth shape.

[0109] It should be noted that: as Figures 9-16 shown in Embodiment 1, the heating wire body 421 is a continuous circular arc structure; Figure 25 Embodiments 6-8 are arranged from top to bottom in sequence. Embodiment 6 is a continuous sawtooth shape, Embodiment 7 is a continuous shaving tooth shape, and Embodiment 8 is a shape combined by a circular arc shape, a sawtooth shape, and a shaving tooth shape; according to the above design concept, the heating wire body 421 can also be other shape structure designs, including but not limited to the above solutions.

[0110] Preferably, as Figure 24As shown in Embodiment 5, a glass tube 440 is sleeved outside the heating wire body 421. Preferably, there is a gap between the glass tube 440 and the heating wire body 421, and the gap can be used to fill gas. Preferably, the glass tube 440 is made of heat-resistant glass material. Preferably, the glass tube 440 is made of high-temperature-resistant quartz glass material.

[0111] As Figure 24 shown in Embodiment 5, since a glass tube 440 is sleeved outside the heating wire body 421, the heat radiated by the heating wire body 421 is radiated and diffused in the gas between the glass tube 440 and the heating wire body 421. With the above structural design, the heating temperature of the heating component 420 is more uniform and the temperature control is more precise, and the wire material is heated more uniformly and precisely.

[0112] Preferably, as shown in Embodiments 4 of 21 - 23, the inner furnace chamber 430 of the furnace body shell 410 is filled with a protective gas. Preferably, the protective gas is one or a combination of nitrogen, helium, neon, argon, xenon, and radon.

[0113] As shown in Embodiments 4 of 21 - 23, the furnace body shell 410 is designed as a flip type, which is convenient and practical. During use, after closing the flip of the furnace body shell 410 and filling the protective gas in the furnace chamber 430, it can provide atmosphere protection for the wire material heating process to improve the production quality of the wire material.

[0114] Regarding the tension control mechanism 50 for adjusting the wire material tension:

[0115] When using an existing sliding drawing device for production, regardless of whether the tower wheel style is a segmented stepped type or a straight cylinder type, when drawing high-strength tungsten wire with a strength exceeding 5500 Mpa, due to the higher deformation resistance of the wire material, the wire material is extremely likely to vibrate during drawing, increasing the friction between the wire material and the tower wheel and resulting in frequent wire breaks. At the same time, it is also extremely easy to wear the surface of the tower wheel and further continuously deteriorate the wire breakage.

[0116] Moreover, in the current high-strength multi-mode multi-pass wire drawing process, due to the high drawing strength and large drawing force, the wire material vibrates violently, resulting in serious unilateral wear of the die. The pulling force before entering the die is relatively small, while after passing through the die, the wire drawing is affected by the friction force inside the die, and the pulling force after passing through the die is relatively large, resulting in a large difference in pulling force between each die sequence. At the same time, during the multi-mode wire drawing process, the drawing forces between each die sequence are inconsistent, which will cause the wire material to accumulate, leading to wire breaks.

[0117] To solve the above problems, a tension control mechanism 50 for adjusting the wire material tension is designed as follows:

[0118] The multi-pass wire drawing equipment includes a tension control mechanism 50 for adjusting the wire tension, a heating furnace 40, and a wire drawing capstan mechanism; the wire drawing capstan mechanism includes a capstan structure, a wire drawing die holder 20, and a first guide wheel set 30, and the capstan structure includes a capstan 110; the heating furnace 40 is arranged between the wire drawing die holder 20 and the first guide wheel set 30, and the tension control mechanism 50 is arranged on the side of the first guide wheel set 30 away from the wire drawing die holder 20; wherein, after the wire passes through the tension control mechanism 50 and the first guide wheel set 30 in sequence, it then passes through the furnace chamber 430 of the heating furnace 40 and the wire drawing die 210 of the wire drawing die holder 20 in sequence, winds around the capstan 110, and returns to the tension control mechanism 50 for the next pass of wire drawing, and so on for multiple passes of wire drawing.

[0119] Preferably, the tension control mechanism 50 includes a tension detection component for detecting the wire tension and a tension adjustment component 510 for adjusting the wire tension; both the tension detection component and the tension adjustment component 510 are electrically connected to the control system.

[0120] The tension control mechanism 50 is arranged at the front end of the first guide wheel set 30 to enable the tension control mechanism 50 to adjust the wire tension: specifically, the tension detection component detects the wire tension and feeds it back to the control system, and the control system controls the tension adjustment component 510 to adjust the wire tension. By adding the above-mentioned tension feedback system and tension adjustment structure, the pre-die and post-die tension control of the wire can be realized, the problem that it is difficult to match the tensions between different die sequences in the multi-die wire drawing process can be improved, and thus the production quality of the wire can be enhanced;

[0121] The tension control mechanism 50 with a wire passing buffer function is added to solve the problems of large die consumption of the wire drawing die 210, fast wear of the capstan 110, and frequent wire breakage caused by large deformation resistance of high-strength wire (such as tungsten wire) during the wire drawing process, resulting in wire vibration.

[0122] Preferably, the tension adjustment component 510 includes two support wheels 511 and a pressure wheel 512 arranged above the middle of the two support wheels 511; wherein, the height of the pressure wheel 512 is adjustable, and the control system adjusts the wire tension by controlling the pressure wheel 512 to rise or fall.

[0123] As Figures 9-16 Shown in Embodiment 1, in use, the tension adjustment component 510 with the above structure is adopted, and the pressure on the wire is adjusted by controlling the pressure wheel 512 to rise or fall, thereby adjusting the wire tension.

[0124] It should be noted that according to the above concept, those skilled in the art can adopt existing tension controllers, such as magnetic powder tension controllers, etc. (whose principles and structures are existing and will not be elaborated here), including but not limited to the above solutions.

[0125] Preferably, a tension control mechanism (50) is provided corresponding to each wire drawing die 210. Preferably, each tension control mechanism 50 is provided with a tension detection component and a tension adjustment component 510, and each tension adjustment component 510 independently adjusts the tension of the wire.

[0126] A tension control mechanism 50 is provided corresponding to each wire drawing die 210, and each tension control mechanism 50 is provided with a tension detection component and a tension adjustment component 510, so that the tension adjustment component 510 corresponding to each wire can independently adjust the tension of the wire. For example, for a tension adjustment component in the form of a pressure wheel 512, the height of the pressure wheel 512 for each wire can be independently controlled for independent tension adjustment. Such a design makes the tension adjustment of the wire more flexible.

[0127] In summary, with the above design: in a multi-pass wire drawing device, a tension control mechanism is designed to adjust the tension of the wire. By adding a tension control mechanism, the pre-die and post-die tension control of the wire can be achieved, and the problem of difficult tension matching between different die sequences in the multi-die wire drawing process can be improved, thereby improving the production quality of the wire. In the multi-pass wire drawing device of the present invention, a tension control mechanism with a wire passing buffer function is added to solve the problems of large die consumption of the wire drawing die, fast wear of the capstan, and frequent wire breakage caused by the large deformation resistance of the high-strength wire during the drawing process, resulting in wire jitter.

[0128] Preferably, as Figures 9-16 shown in Embodiment 1, a pay-off mechanism 60 is further included, which is used to pay off the wire in the first pass.

[0129] Preferably, as Figures 9-16 shown in Embodiment 1, a take-up mechanism 70 is further included, which is used to take up the wire in the last pass.

[0130] It should be noted that:

[0131] The control system is a prior art. For example, a PLC controller can be used. It has a programmable memory for storing internal programs, executing user-oriented instructions such as logical operations, sequential control, timing, counting, and arithmetic operations, and controlling various types of machinery or production processes through digital or analog input / output. It is a prior art, and its working principle will not be elaborated here. The tension detection component and the tension adjustment component 510 are also prior art devices. The working principle of their cooperation with the control system for tension detection, feedback, and adjustment is a prior art, and will not be elaborated here.

[0132] To verify the effect of this application, the following experimental comparison data are given:

[0133] (1) To verify the effect of the solution of combining multiple capstans arranged side by side to form a capstan group in this application, the following verification tests are provided:

[0134] Verification Experiment 1: The wire drawing of the wire material was carried out 8 passes with the equipment of Example 1. Among them, 4 wire materials were arranged on each of the two capstans 110 of the capstan group 10. The measured results were as follows: the wire breakage rate during wire drawing was 6.1%, and the average length per single coil was 267,000 meters.

[0135] Comparative Experiment 1: The only difference between the equipment used in Comparative Experiment 1 and that in Verification Experiment 1 was that: the two capstans 110 of the capstan group 10 were replaced by a segmented (8 segments) stepped capstan 110a as shown in Figure 3 The measured results were as follows: the wire breakage rate during wire drawing was 13.9%, and the average length per single coil was 138,000 meters.

[0136] Comparative Experiment 2: The only difference between the equipment used in Comparative Experiment 2 and that in Verification Experiment 1 was that: the two capstans 110 of the capstan group 10 were replaced by a straight cylindrical capstan 110b as shown in Figure 6 The measured results were as follows: the wire breakage rate during wire drawing was 18.5%, and the average length per single coil was 126,000 meters.

[0137] The above data indicate that: using the capstan group 10 divided into two capstans 110 for wire drawing can effectively reduce the wire breakage rate of the wire material and increase the output length per single coil.

[0138] (2) In order to verify the effect of the heating furnace of the present application, the following verification tests were provided:

[0139] Comparative Experiment 3: The internal temperature uniformity of the heating furnace 40 as shown in Figures 7-8 was tested. Among them, as shown in Figure 7 the temperature difference between the first temperature zone, the second temperature zone and the third temperature zone was 62°C; the temperature difference between the fourth temperature zone, the fifth temperature zone and the sixth temperature zone was 54°C; the temperature difference between the seventh temperature zone, the eighth temperature zone and the ninth temperature zone was 66°C.

[0140] Verification Experiment 2: The temperature uniformity test was carried out on the heating furnace 40 as shown in Figures 9-16 in Example 1. Among them, as shown in Figure 14 9 temperature zones the same as those in Comparative Experiment 3 were formed in its furnace chamber 430. The temperature difference between the first temperature zone, the second temperature zone and the third temperature zone was 27°C; the temperature difference between the fourth temperature zone, the fifth temperature zone and the sixth temperature zone was 18°C; the temperature difference between the seventh temperature zone, the eighth temperature zone and the ninth temperature zone was 22°C.

[0141] The above data indicate that: adopting the heating scheme of the present utility model can effectively ensure the temperature uniformity of the heating area, thereby ensuring the temperature uniformity of each pass of the wire material in the middle part and the inlet and outlet parts of the furnace chamber 430.

[0142] (3) In order to verify the effect of adding the glass tube 440 outside the heating wire main body 421 of the present application, the following verification tests were provided:

[0143] Verification Experiment 3: The only difference between the equipment used in this experiment and that in Verification Experiment 2 is that a heat-resistant glass tube 440 is sleeved outside the heating wire body 421 in Verification Experiment 3. The measured data are as follows: the temperature difference between the first temperature zone, the second temperature zone, and the third temperature zone is 15 °C; the temperature difference between the fourth temperature zone, the fifth temperature zone, and the sixth temperature zone is 9 °C; the temperature difference between the seventh temperature zone, the eighth temperature zone, and the ninth temperature zone is 17 °C.

[0144] The above data indicate that by adding the glass tube 440 around the heating wire body 421, the heating uniformity can be further improved.

[0145] (4) In order to verify the scheme of using multiple stepped pulleys arranged side by side to form a stepped pulley group in this application and its effect applied to wire drawing in more passes, the following verification tests are provided:

[0146] Verification Experiment 4: The only difference between the equipment used in Verification Experiment 4 and that in Verification Experiment 1 is that the number of straight cylindrical stepped pulleys 110 used is 3, the number of wire drawing dies 210 is 12 (12 corresponding to the first guide pulley 310), the first stepped pulley 110 distributes 5 wires (the one close to the wire drawing die 210), the second stepped pulley 110 distributes 4 wires, and the third stepped pulley 110 distributes 3 wires. The measured results are as follows: the wire breakage rate during wire drawing is 8.7%, and the average length per single coil is 238,000 meters;

[0147] Verification Experiment 5: The only difference between the equipment used in Verification Experiment 5 and that in Verification Experiment 4 is that the number of stepped pulleys 110 used is 2, including one straight cylindrical stepped pulley 110b and one stepped stepped pulley 110a (divided into 4 sections). The straight cylindrical stepped pulley 110b distributes 4 wires (the one close to the wire drawing die 210), and the stepped stepped pulley 110a distributes 4 wires. The measured results are as follows: the wire breakage rate during wire drawing is 5.9%, and the average length per single coil is 269,000 meters;

[0148] Verification Experiment 6: The only difference between the equipment used in Verification Experiment 6 and that in Verification Experiment 4 is that the number of stepped pulleys 110 used is 2, both of which are stepped stepped pulleys 110a (divided into 4 sections). The first stepped stepped pulley 110a distributes 4 wires (the one close to the wire drawing die 210), and the second stepped stepped pulley 110a distributes 4 wires. The measured results are as follows: the wire breakage rate during wire drawing is 7.9%, and the average length per single coil is 253,000 meters;

[0149] Verification Experiment Seven: The only difference between the equipment used in this verification experiment and that in Verification Experiment Four is that: the number of step pulleys 110 used is 3, the number of wire drawing dies 210 is 8 (8 corresponding to the first guide pulley 310), 3 wire materials are distributed on the first step pulley 110 (the one close to the wire drawing die 210), 3 wire materials are distributed on the second step pulley 110, and 2 wire materials are distributed on the second step pulley 110. The measured results are: the wire breakage rate during drawing is 4.6%, and the average length per single coil is 292,000 meters;

[0150] Comparison Experiment Four: The only difference between the equipment used in this comparison experiment and that in Verification Experiment Four is that: a stepped step pulley 110a with one section (12 sections) is used to replace the three step pulleys 110 of the step pulley group 10. The measured results are: the wire breakage rate during drawing is 30.8%, and the average length per single coil is 65,000 meters;

[0151] Comparison Experiment Five: The only difference between the equipment used in this comparison experiment and that in Verification Experiment Four is that: a straight cylindrical step pulley 110b is used to replace the three step pulleys 110 of the step pulley group 10. The measured results are: the wire breakage rate during drawing is 43.2%, and the average length per single coil is 42,000 meters.

[0152] The above data shows that: using the step pulley group 10 composed of multiple step pulleys 110 for drawing can effectively reduce the wire breakage rate of the wire and increase the output length per single coil.

[0153] Compared with the prior art, the solution of the embodiment of the present utility model has the following beneficial effects:

[0154] (1) The wire drawing step pulley mechanism of the present utility model: It adopts the method of arranging multiple step pulleys side by side to form a step pulley group. Through the corresponding cooperation between the step pulley group and the wire drawing die holder, and the winding cooperation between the first guide pulley group and the step pulley group, multiple passes of wire materials are distributed on multiple step pulleys, solving the problem of excessive difference in sliding coefficients between the first and last passes caused by an increase in the number of drawing passes, and significantly improving the single - machine drawing efficiency;

[0155] Moreover, due to the winding cooperation design of the step pulley group, the wire drawing die holder, and the first guide pulley group, on the basis of ensuring that multiple passes of wire materials are distributed on multiple step pulleys, multiple - pass drawing is integrated together, effectively saving the equipment space and the wire material production space.

[0156] (2) The wire drawing step pulley mechanism of the present utility model: The step pulley is designed to be divided into at least Z sections with different roughness regions, solving the problem of excessive difference in sliding coefficients between the first and last passes caused by an increase in the number of drawing passes, and significantly improving the single - machine drawing efficiency.

[0157] (3) The design of the present utility model has multiple heating components with independent temperature control settings. The temperature of the heating components can be changed according to actual temperature requirements, and heating control can be performed on different positions of the heating furnace chamber, effectively improving the temperature uniformity in the furnace chamber. At the same time, it can meet the temperature gradient design requirements of multi-mode wire drawing, thereby effectively improving the quality of wire production.

[0158] (4) In the multi-pass wire drawing equipment of the present utility model, a tension control mechanism is designed to adjust the tension of the wire: by adding a tension control mechanism, the pre-die and post-die tension control of the wire can be achieved, improving the problem that it is difficult to match the tensions between different die sequences during multi-mode wire drawing, thereby improving the quality of wire production.

[0159] In the multi-pass wire drawing equipment of the present utility model, a tension control mechanism with a wire passing buffer function is added to solve the problems of large die consumption of the wire drawing die, fast wear of the capstan, and frequent wire breakage caused by the large deformation resistance of high-strength wire during the drawing process, resulting in wire shaking.

[0160] Although terms such as capstan group, wire drawing die holder, and first guide wheel group are used more frequently in this article, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A multi-pass wire drawing device, comprising a drawing tower wheel mechanism and a heating furnace (40) for heating the wires of each pass; characterized in that: The drawing tower wheel mechanism comprises a tower wheel assembly (10), a wire drawing die frame (20) and a first guide wheel assembly (30) which are sequentially arranged on one side of the tower wheel assembly (10); The step pulley assembly (10) comprises N step pulleys (110) arranged in parallel; the wire drawing die frame (20) comprises M wire drawing dies (210); and the first guide wheel assembly (30) comprises M first guide wheels (310) arranged in one-to-one correspondence with the wire drawing dies (210); The wire is guided by the first guide wheel assembly (30), passes through the die opening of the wire drawing die (210), is wound around the tower wheel (110), and is wound back onto the first guide wheel assembly (30), and is repeatedly drawn for multiple passes; The total number of drawing passes is M, M is greater than or equal to 2, N is greater than or equal to 2 and less than or equal to M, and each tower wheel (110) performs at least one drawing pass of the wire.

2. The multi-pass wire drawing device according to claim 1, characterized in that: The front tower wheel (110) is provided with a giving way mechanism for the wire material wound on the rear tower wheel (110) to pass through, and the front tower wheel (110) is closer to the wire drawing die frame (20) than the rear tower wheel (110).

3. The multi-pass wire drawing device according to claim 2, characterized in that: The yielding mechanism is a thin rod (111); The front tower wheel (110) comprises a thin rod (111) and a tower wheel body (112), so that the wire material wound on the rear tower wheel (110) can pass through the space above the thin rod (111).

4. The multi-pass wire drawing apparatus according to claim 1, characterized in that: The step pulley (110) is a straight-cylinder step pulley (110b) and / or a segmented stepped step pulley (110a).

5. The multi-pass wire drawing apparatus according to claim 1, characterized in that: The step pulley assembly (10) comprises a segmented stepped step pulley (110a); A second guide wheel assembly is provided between the step wheel assembly (10) and the wire drawing die frame (20); the second guide wheel assembly comprises M second guide wheels which are arranged in a one-to-one correspondence with the wire drawing dies (210).

6. The multi-pass wire drawing equipment according to claim 1, characterized in that: The heating furnace comprises a furnace shell (410) and a heating component arranged in a furnace chamber (430) of the furnace shell (410); the heating component comprises Y heating components (420) with independent temperature control settings, where Y is greater than or equal to 2.

7. The multi-pass wire drawing apparatus according to claim 6, characterized in that: The heating component (420) is detachably connected to the furnace shell (410); And / or, each of the heating components (420) comprises a heating wire body (421) and a temperature sensing component for measuring temperature; and the heating wire body (421) and the temperature sensing component are both connected to a control system.

8. The multi-pass wire drawing apparatus according to claim 7, characterized in that: Each of the heating wire bodies (421) extends along the axial direction of the wire material, so that Y heating wire bodies (421) are arranged in parallel in the furnace (430); The heating wire body (421) is located above the wire material and / or below the wire material.

9. The multi-pass wire drawing apparatus according to any one of claims 7-8, characterized in that: The heating wire body (421) is sheathed with a glass tube (440); a gap is provided between the glass tube (440) and the heating wire body (421), and the gap can be used to fill gas; and / or, The inner furnace chamber (430) of the furnace shell (410) is filled with protective gas.

10. The multi-pass wire drawing equipment according to claim 1, characterized in that: Also included is a tension control mechanism (50) for adjusting the tension of the wire; The heating furnace (40) is arranged between the wire drawing die frame (20) and the first guide wheel assembly (30), and the tension control mechanism (50) is arranged on a side of the first guide wheel assembly (30) away from the wire drawing die frame (20); The wire passes through the tension control mechanism (50) and the first guide wheel assembly (30) in sequence, and then passes through the furnace (430) of the heating furnace (40) and the drawing die (210) of the drawing die frame (20) in sequence, and is then wound around the tower wheel (110), and multiple drawing passes are performed in this reciprocating manner.

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