Drawing cone pulley, drawing cone pulley mechanism and multi-pass wire drawing equipment

Abstract

The utility model relates to the technical field of drawing equipment, in particular to a drawing cone pulley, a drawing cone pulley mechanism and multi-pass wire drawing equipment. The surface of the drawing cone pulley is divided into at least Z sections of areas along the axial direction; wherein the surface roughness of each section of area is different, so that the surface friction coefficient of each section of area is different; wherein the total drawing pass is M, and when M is larger than or equal to 2, Z is larger than or equal to 2 and smaller than or equal to M, so that at least one pass of wire drawing is conducted on each area. The drawing cone pulley 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 titled "A Drawing Tower Pulley Mechanism, a Heating Furnace, and a Multi-pass Wire Drawing Equipment" with an application number of 2023108301082 and filed with 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 drawing tower pulley, a drawing tower pulley mechanism, and a multi-pass wire drawing equipment. Background Art

[0003] High-strength tungsten alloy wires are gradually replacing 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).

[0004] Currently, the drawing of high-strength and low-diameter metal wire materials (tungsten wires) is mainly carried out by 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. It is impossible to integrate more passes, 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 this straight cylindrical tower pulley is the same, and the wire diameter of the wire materials gradually becomes thinner, the difference in the slip amount between passes becomes larger; in the straight cylindrical sliding drawing method, after the number of drawing passes exceeds 7, due to the too large difference in the 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 drawing tower pulley, a drawing tower pulley mechanism, and a multi-pass wire drawing equipment. The technical solution of the drawing tower pulley is as follows:

[0008] The surface of the drawing tower wheel is axially divided into at least Z sections of regions; wherein, the surface roughness of each section of the region is different, so that the surface friction coefficient of each section of the region is different; wherein, the total number of drawing passes is M. When M is greater than or equal to 2, Z is greater than or equal to 2 and less than or equal to M, so that each region performs at least one pass of wire drawing.

[0009] In some embodiments, different coatings are applied to the surface of each section of the region, so that the surface roughness of each section of the region is different.

[0010] In some embodiments, the surface roughness Ra of the region is 0.05 - 0.8.

[0011] In some embodiments, the coatings include alumina coating, zirconia coating, WC coating, chromium coating, titanium carbide coating, titanium nitride coating, and carbonitride coating.

[0012] The present invention also provides a drawing tower wheel mechanism, which includes a tower wheel, a wire drawing die holder and a first guide wheel group sequentially arranged on one side of the tower wheel; the wire drawing die holder includes M wire drawing dies; the first guide wheel group includes M first guide wheels arranged corresponding to the wire drawing dies one by one; wherein, the wire is guided by the first guide wheel group, passes through the die orifice of the wire drawing die, and then winds around the tower wheel and returns to the first guide wheel group, and multiple passes of drawing are performed reciprocally in this way.

[0013] The present invention also provides a multi-pass wire drawing device, which includes the drawing tower wheel as described above, or includes the drawing tower wheel mechanism as described above.

[0014] Compared with the prior art, the drawing tower wheel provided by the present invention has the following beneficial effects:

[0015] The surface of the drawing tower wheel of the present invention is divided into at least Z sections of regions with different roughness, which solves 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 wire breakage, and significantly improves the single-stage drawing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a front view of a multi-pass wire drawing device using a segmented stepped tower wheel in the prior art;

[0018] Figure 2It is a top view of an existing multi-pass drawing device with a segmented stepped cone pulley;

[0019] Figure 3 It is a perspective view of an existing multi-pass drawing device with a segmented stepped cone pulley;

[0020] Figure 4 It is a front view of an existing multi-pass drawing device with a straight cylindrical cone pulley;

[0021] Figure 5 It is a top view of an existing multi-pass drawing device with a straight cylindrical cone pulley;

[0022] Figure 6 It is a perspective view of an existing multi-pass drawing device with a straight cylindrical cone pulley;

[0023] Figure 7 It is a front view of the multi-pass drawing device provided in Embodiment 1;

[0024] Figure 8 It is a top view of the multi-pass drawing device provided in Embodiment 1;

[0025] Figure 9 It is a perspective view of the multi-pass drawing device provided in Embodiment 1;

[0026] Figure 10 It is a top view of the cone pulley set and the wire drawing die holder in Embodiment 1;

[0027] Figure 11 It is a perspective view of the cone pulley set and the wire drawing die holder in Embodiment 1;

[0028] Figure 12 It is a top view of the cone pulley set and the wire drawing die holder in Embodiment 2;

[0029] Figure 13 It is a perspective view of the cone pulley set and the wire drawing die holder in Embodiment 2;

[0030] Figure 14 It is a top view of the cone pulley set and the wire drawing die holder in Embodiment 3;

[0031] Figure 15 It is a perspective view of the cone pulley set and the wire drawing die holder in Embodiment 3;

[0032] Figure 16 It is a top view of the multi-pass drawing device in Embodiment 4;

[0033] Figure 17 It is a top view of the cone pulley in Embodiment 4;

[0034] Figure 18 It is a top view of the cone pulley and the wire drawing die holder in Embodiment 5.

[0035] Reference numerals: 10 pulley set, 20 wire drawing die holder, 30 first guide pulley set, 40 heating furnace, 50 tension control mechanism, 60 wire feeding mechanism, 70 winding mechanism, 110 pulley, 111 thin rod, 112 pulley body, 112a segmented stepped pulley, 112b straight cylindrical pulley, 113 area, 113a first area, 113b second area, 113c third area, 210 wire drawing die, 310 first guide pulley, 410 furnace body shell, 420 heating component, 430 furnace chamber. Detailed implementation manners

[0036] 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. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0037] In the description of the present utility model, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are 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 thus should not be construed as a limitation of 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.

[0038] The present utility model provides a multi-pass wire drawing device as Figures 7-11 in Embodiment 1, Figures 12-13 in Embodiment 2, Figures 14-15 in Embodiment 3, in Embodiment 4 as shown in 16 - 17, Figure 18 in Embodiment 5, which includes a drawing pulley mechanism, a heating furnace 40, and a tension control mechanism 50 for adjusting the wire tension.

[0039] Regarding the drawing pulley mechanism

[0040] Design one of the drawing pulley mechanism:

[0041] As Figures 7-11 in Embodiment 1, Figures 12-13 in Embodiment 2, Figures 14-15As shown in Embodiment 3, the 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, is wound around the tower wheel 110 and then wound back to the first guide wheel group 30, and multiple passes of drawing are performed reciprocally; 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 pass of wire drawing.

[0042] Specifically, as Figures 7-11 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, is wound around the tower wheel 110 and then wound back to the first guide wheel group 30. After winding back, like the first pass, the second pass of drawing starts; and so on until the last pass.

[0043] Among them, in use, the wires in multiple passes are divided into multiple groups and are drawn by multiple tower wheels 110 respectively. For example: in this Embodiment 1, the total number of passes is eight, divided into two groups, with four passes in each group. The wires from the first pass to the fourth pass are drawn on the first tower wheel 110, and so on. The fifth pass and the eighth pass are drawn on the second tower wheel 110.

[0044] In summary, for the drawing tower wheel mechanism of the present utility model, it adopts the method of arranging multiple tower wheels 110 side by side to form the tower wheel group 10. Through the corresponding cooperation between the tower wheel group 10 and the wire drawing die holder 20, and the winding cooperation between the first guide wheel group 30 and the tower wheel group 10, the wires in multiple passes are distributed on multiple tower wheels 110. Among them, since each independent tower wheel 110 can independently adjust the rotation speed, the problem of excessive difference in the sliding coefficients between the first pass and the last pass caused by the increase in the number of drawing passes and wire breakage is solved, and the single - machine drawing efficiency is improved; and, due to the winding cooperation design of the tower wheel group 10, the wire drawing die holder 20, and the first guide wheel group 30, on the basis of ensuring that the wires in multiple passes are distributed on multiple tower wheels 110, the multiple - pass drawing is integrated together, effectively saving the equipment space and the wire production space.

[0045] 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.

[0046] Preferably, if Figures 7-11 Embodiment 1, Figures 12-13 Embodiment 2, Figures 14-15 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 .

[0047] Preferably, if Figures 7-11 Embodiment 1, Figures 12-13 Embodiment 2, Figures 14-15 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 .

[0048] like Figures 7-11 Embodiment 1, Figures 12-13 Embodiment 2, Figures 14-15 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.

[0049] 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 18In the scheme of staggered design of the cone pulley 110 shown in Embodiment 5, N of the cone pulleys 110 are staggered along their axial directions, so that the wire wound on the cone pulley 110 does not pass through the area where the adjacent cone pulley 110 is located; for another example, a groove is provided on the upper part of a partial area of the previous cone pulley 110, so that the wire wound on the subsequent cone pulley 110 can pass through the groove of the previous cone pulley 110, including but not limited to the embodiment scheme.

[0050] Preferably, as Figures 7-11 in Embodiment 1, Figures 12-13 Embodiment 2, Figures 14-15 as shown in Embodiment 3, the first guide pulley group 30 includes M first guide pulleys 310 arranged in one-to-one correspondence with the wire drawing dies 210.

[0051] During use, one first guide pulley 310 is provided for the wire in each pass, separating each pass, facilitating the alignment of the wire path and the wire passing buffer in each pass, which is convenient and practical.

[0052] Preferably, the cone pulley 110 is a straight cylinder type cone pulley 112b and / or a segmented stepped cone pulley 112a.

[0053] As Figures 7-11 in Embodiment 1, Figures 12-13 Embodiment 2, Figures 14-15 as shown in Embodiment 3, the multiple cone pulleys 110 in the cone pulley group 10 can be any combination of the straight cylinder type cone pulley 112b and the segmented stepped cone pulley 112a.

[0054] Preferably, when the cone pulley group 10 includes the segmented stepped cone pulley 110a, a second guide pulley group (not shown in the figure) is provided between the cone pulley group 10 and the wire drawing die holder 20. Preferably, the second guide pulley group includes M second guide pulleys arranged in one-to-one correspondence with the wire drawing dies 210.

[0055] After the wire exits from the wire drawing die 210, there is a height difference for the segmented stepped cone pulley 110a in different passes. The second guide pulley is used for guiding to adapt to the height difference from the wire drawing die 210 to the segmented stepped cone pulley 110a in different passes, improving the drawing effect.

[0056] Drawing cone pulley mechanism design two:

[0057] As Figures 16-17 shown in Embodiment 4, the drawing cone pulley mechanism includes a cone pulley 110; the surface of the cone pulley 110 is divided into at least Z section areas 113 along its axial direction; 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; at least one pass of wire drawing is performed on each area 113.

[0058] Preferably, it further includes a wire drawing die holder 20 and a first guide wheel set 30 disposed on one side of the wire drawing die holder 20 away from the capstan 110; the wire drawing die holder 20 includes M wire drawing dies 210; the wire is guided by the first guide wheel set 30, passes through the die orifice of the wire drawing die 210, is wound around the capstan 110 and then wound back to the first guide wheel set 30, and multiple passes of wire drawing are carried out reciprocally in this way.

[0059] Specifically, as Figures 16-17 shown, during the wire drawing process, the wire in the first pass is guided by the first guide wheel set 30, passes through the die orifice of the wire drawing die 210, is wound around the capstan 110 and then wound back to the first guide wheel set 30. After winding back, like the first pass, the second pass of wire drawing begins; and so on until the last pass.

[0060] Among them, during use, the wires in multiple passes are divided into Z groups and are respectively arranged on Z different roughness regions 113 of the capstan 110, and the wire drawing of the wire is carried out by winding on each region 113 of the capstan 110. For example: in this Embodiment 4, the total number of passes is eight and is divided into three groups (Z = 3). The 1st - 3rd passes are wound on the first region 113a, the 4th - 5th passes are wound on the second region 113b, and the 6th - 8th passes are wound on the third region 113c. And from the region 113 where the first pass is located to the region 113 where the last pass is located, the roughness increases from Ra0.05 to Ra0.8.

[0061] In summary, in the above - mentioned wire - drawing capstan mechanism of the present utility model, the capstan 110 is designed to be divided into at least Z sections of different roughness regions 113, and the wires in multiple passes are distributed on multiple different roughness regions 113 of the capstan 110 for wire drawing, so that at the same rotational speed of the capstan 110, the friction coefficients 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 capstan 110, due to the different roughnesses of different regions 113, the friction coefficients between each region 113 and the wire can be adjusted, thereby solving the problem of wire breakage caused by too large a difference in the sliding coefficients between the first and last passes due to an increase in the number of wire - drawing passes.

[0062] For the existing segmented stepped capstan 110, due to the design requirements of the capstan 110 steps and the coaxiality requirements, the number of wire - drawing passes is generally 6 or 8, not exceeding 10; while the design of the capstan 110 divided into at least Z sections of different roughness regions 113 is not limited by the design requirements of the capstan steps and the coaxiality requirements, and can be carried out according to the total number of wire - drawing passes M, and the number Z of regions 113 on the surface of the capstan 110 and the roughness of each region 113 can be adaptively adjusted to adapt to the processing of more wire - drawing passes.

[0063] Moreover, through the corresponding cooperation between the cone pulley 110 and the wire drawing die holder 20, and the winding cooperation between the first guide pulley group 30 and the cone pulley 110, while ensuring that the multi-pass wire is distributed on multiple regions 113 with different roughnesses, the multi-pass drawing is integrated together, effectively saving the equipment space and the wire production space.

[0064] Preferably, as Figures 16-17 shown in Embodiment 4, different coatings are applied to the surfaces of each section of the region 113 to make the surface roughness of each section of the region 113 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.

[0065] Preferably, the first guide pulley group 30 includes M first guide pulleys 310 arranged in one-to-one correspondence with the wire drawing dies 210.

[0066] During use, each pass of wire is equipped with a first guide pulley 310 to separate each pass, facilitating the alignment of the wire path and the wire passing buffer for each pass, which is convenient and practical.

[0067] It should be noted that:

[0068] According to the above design concept, for the number Z of regions 113 with different roughnesses, it can be adaptively adjusted according to the total number of drawing passes M, including but not limited to the scheme of Embodiment 4. 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 4;

[0069] In the statements of "axially divided into at least Z sections of regions 113" and "N cone pulleys 110 are staggered in the axial direction" described herein, the axial direction refers to the rotation axis of the cone pulley 110.

[0070] According to the above design concept, other methods can also be used to make the roughnesses of the Z regions 113 different, including but not limited to the above-mentioned scheme of applying different coatings. Similarly, according to the above design concept, existing coatings other than the above-mentioned alumina coating, zirconia coating, WC coating (tungsten carbide coating), chromium coating, titanium carbide coating, titanium nitride coating, carbonitride coating can also be applied to adjust the roughness of the region 113, including but not limited to the embodiment scheme.

[0071] Regarding the combination of the drawing cone pulley mechanism design one and the drawing cone pulley mechanism design two:

[0072] In the solution where N sheaves 110 arranged in parallel form a sheave group 10, according to the above design concept, the sheaves 110 in the sheave group 10 can be set with Z regions 113 of different roughness to further improve the single - unit drawing efficiency and drawing quality.

[0073] As Figures 7-11 shown in Embodiment 1, Figure 18 Embodiment 5, the sheave structure is the sheave group 10; the sheave group 10 includes N sheaves 110 arranged in parallel. In the design solution of the sheave group 10, at least one of the N sheaves 110 can be designed such that its surface is divided into at least Z regions 113 along its axial direction; the surface roughness of each region 113 is different, so that the surface friction coefficient of each region 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 region 113 and each sheave 110 are used for drawing the wire at least once.

[0074] In the solution where N sheaves 110 arranged in parallel form a sheave group 10, at least one of the sheaves 110 in the sheave group 10 is designed with Z regions 113 of different roughness. During drawing, each region 113 and each sheave 110 are used for drawing the wire at least once. In this way, the equipment space utilization rate is higher, and the single - unit drawing efficiency and drawing quality are better; for example, Figure 18 in Embodiment 5, one of the sheaves 110 is set with Z regions 113 of different roughness.

[0075] In addition, a multi - pass wire drawing equipment shown in Embodiments 1 - 5 provided by the present utility model includes a drawing sheave mechanism, a heating furnace 40, and a tension control mechanism 50 for adjusting the wire tension:

[0076] The multi - pass wire drawing equipment includes a tension control mechanism 50 for adjusting the wire tension, a heating furnace 40, and a drawing sheave mechanism; the heating furnace 40 includes a furnace body shell 410 and a heating component 420 arranged in a furnace chamber 430 of the furnace body shell 410. It is arranged between the wire drawing die holder 20 and the first guide wheel group 30, and each pass of wire passes through the furnace chamber 430 of the heating furnace 40 for heating; the tension control mechanism 50 is arranged on the side of the first guide wheel group 30 away from the wire drawing die holder 20; where, after the wire passes through the tension control mechanism 50 and the first guide wheel group 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, and then winds around the sheave 110 and returns to the tension control mechanism 50 to perform the next - pass drawing, and so on for multi - pass drawing.

[0077] Preferably, as Figures 7-11 shown in Embodiment 1, it further includes an unwinding mechanism 60 for unwinding the wire in the first pass.

[0078] Preferably, as Figures 7-11 shown in Embodiment 1, a coiling mechanism 70 is further included, which is used for coiling the wire material in the last pass.

[0079] To verify the effect of this application, the following experimental comparison data are given:

[0080] (1) To verify the effect of the solution of combining multiple stepped pulleys arranged side by side to form a stepped pulley group in this application, the following verification tests are provided:

[0081] Verification Experiment 1: Using the equipment of Embodiment 1 to draw the wire material for 8 passes. Among them, the two stepped pulleys 110 of the stepped pulley group 10 are respectively arranged with 4 passes of wire material. The measured results are: the wire breakage rate during drawing is 6.1%, and the average length per single coil is 267,000 meters;

[0082] Comparative Experiment 1: The difference between the equipment used in Comparative Experiment 1 and Verification Experiment 1 is only that: the two stepped pulleys 110 of the stepped pulley group 10 are replaced by a segmented (8 segments) stepped pulley 110a as Figure 3 shown. The measured results are: the wire breakage rate during drawing is 13.9%, and the average length per single coil is 138,000 meters;

[0083] Comparative Experiment 2: The difference between the equipment used in Comparative Experiment 2 and Verification Experiment 1 is only that: the two stepped pulleys 110 of the stepped pulley group 10 are replaced by a straight cylindrical stepped pulley 110b as Figure 6 shown. The measured results are: the wire breakage rate during drawing is 18.5%, and the average length per single coil is 126,000 meters.

[0084] The above data show that: using the stepped pulley group 10 composed of two stepped pulleys 110 for drawing can effectively reduce the wire breakage rate of the wire material and increase the output length per single coil.

[0085] (2) To verify the solution of combining multiple stepped pulleys arranged side by side to form a stepped pulley group in this application and its effect applied to drawing of more passes of wire material, the following verification tests are provided:

[0086] Verification Experiment 2: The difference between the equipment used in Verification Experiment 2 and Verification Experiment 1 is only 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 passes of wire material (the one close to the wire drawing die 210), the second stepped pulley 110 distributes 4 passes of wire material, and the third stepped pulley 110 distributes 3 passes of wire material. The measured results are: the wire breakage rate during drawing is 8.7%, and the average length per single coil is 238,000 meters;

[0087] Verification Experiment 3: The only difference between the equipment used in Verification Experiment 3 and that in Verification Experiment 2 is that the number of sheaves 110 used is 2, including one straight cylindrical sheave 110b and one stepped sheave 110a (divided into 4 sections). The straight cylindrical sheave 110b distributes 4 wire materials (the one closer to the wire drawing die 210), and the stepped sheave 110a distributes 4 wire materials. The measured results are: the wire breakage rate during drawing is 5.9%, and the average length per single coil is 269,000 meters.

[0088] Verification Experiment 4: The only difference between the equipment used in Verification Experiment 4 and that in Verification Experiment 2 is that the number of sheaves 110 used is 2, both being stepped sheaves 110a (divided into 4 sections). The first stepped sheave 110a distributes 4 wire materials (the one closer to the wire drawing die 210), and the second stepped sheave 110a distributes 4 wire materials. The measured results are: the wire breakage rate during drawing is 7.9%, and the average length per single coil is 253,000 meters.

[0089] Verification Experiment 5: The only difference between the equipment used in this verification experiment and that in Verification Experiment 2 is that the number of sheaves 110 used is 3, and the number of wire drawing dies 210 is 8 (8 corresponding to the first guide wheel 310). The first sheave 110 distributes 3 wire materials (the one closer to the wire drawing die 210), the second sheave 110 distributes 3 wire materials, and the second sheave 110 distributes 2 wire materials. The measured results are: the wire breakage rate during drawing is 4.6%, and the average length per single coil is 292,000 meters.

[0090] Comparative Experiment 3: The only difference between the equipment used in this comparative experiment and that in Verification Experiment 2 is that one stepped sheave 110a with 12 sections is used to replace the three sheaves 110 of the sheave 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.

[0091] Comparative Experiment 4: The only difference between the equipment used in this comparative experiment and that in Verification Experiment 2 is that one straight cylindrical sheave 110b is used to replace the three sheaves 110 of the sheave 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.

[0092] The above data shows that using the sheave group 10 composed of multiple sheaves 110 for wire drawing can effectively reduce the wire breakage rate and increase the output length per single coil.

[0093] Compared with the prior art, the solution of the embodiment of the present utility model has the following beneficial effects:

[0094] (1) The drawing tower pulley mechanism of the present application: It adopts the method of arranging multiple tower pulleys side by side to form a tower pulley group. Through the corresponding cooperation between the tower pulley group and the wire drawing die holder, and the winding cooperation between the first guide pulley group and the tower pulley group, multi-pass wire materials are distributed on multiple tower pulleys, solving the problem of wire breakage caused by excessive difference in sliding coefficients between the first and last passes due to an increase in the number of drawing passes, and significantly improving the single-stage drawing efficiency;

[0095] Moreover, due to the winding cooperation design of the tower pulley group, the wire drawing die holder, and the first guide pulley group, on the basis of ensuring that multi-pass wire materials are distributed on multiple tower pulleys, multi-pass drawing is integrated together, effectively saving equipment space and wire material production space.

[0096] (2) The drawing tower pulley provided by the present application is divided into at least Z sections with different roughnesses, solving the problem of wire breakage caused by excessive difference in sliding coefficients between the first and last passes due to an increase in the number of drawing passes, and significantly improving the single-stage drawing efficiency.

[0097] Moreover, it adopts the tower pulley design divided into at least Z sections with different roughnesses and the winding cooperation design with the wire drawing die holder and the first guide pulley group. On the basis of ensuring that multi-pass wire materials are distributed in each area of the tower pulley, multi-pass drawing is integrated together, effectively saving equipment space and wire material production space.

[0098] (3) In addition, the drawing tower pulley mechanism provided by the present application combines the design of arranging multiple tower pulleys side by side to form a tower pulley group with the design of a tower pulley divided into at least Z sections with different roughnesses. Through the corresponding cooperation between the tower pulley group and the wire drawing die holder, and the winding cooperation between the first guide pulley group and the tower pulley group, multi-pass wire materials are distributed on multiple tower pulleys, solving the problem of wire breakage caused by excessive difference in sliding coefficients between the first and last passes due to an increase in the number of drawing passes, and significantly improving the single-stage drawing efficiency; moreover, due to the winding cooperation design of the tower pulley structure, the wire drawing die holder, and the first guide pulley group, on the basis of ensuring that multi-pass wire materials are distributed on multiple tower pulleys, multi-pass drawing is integrated together, effectively saving equipment space and wire material production space.

[0099] Although terms such as tower pulley, wire drawing die holder, and first guide pulley group are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only 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.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention 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 cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pulling step pulley, characterized in that: Its surface is divided into at least Z sections (113) along its axial direction; wherein the surface roughness of each section of the section (113) is different, so that the surface friction coefficient of each section of the section (113) is different; The total number of drawing passes is M, and when M is greater than or equal to 2, Z is greater than or equal to 2 and less than or equal to M, so that each area (113) is subjected to at least one wire drawing pass.

2. The pulling step pulley according to claim 1, characterized in that: 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.

3. The pulling step pulley according to claim 2, characterized in that: The surface roughness Ra of the region (113) is 0.05 to 0.

8.

4. The pulling step pulley according to claim 2, characterized in that: The coatings include aluminum oxide coatings, zirconium oxide coatings, WC coatings, chromium coatings, titanium carbide coatings, titanium nitride coatings, and titanium carbonitride coatings.

5. A pulling tower pulley mechanism, characterized in that: It comprises a tower wheel (110), a wire drawing die frame (20) and a first guide wheel assembly (30) which are sequentially arranged on one side of the tower wheel (110); The wire drawing die frame (20) comprises M wire drawing dies (210); 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; At least one of the step pulleys (110) is a drawing step pulley as described in any one of claims 1 to 4.

6. A multi-pass wire drawing device, characterized in that: It comprises a pulling tower wheel as described in any one of claims 1 to 4.

7. A multi-pass wire drawing device, characterized in that: It comprises the pulling tower wheel mechanism as claimed in claim 5.

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