A precision wire drawing device for processing medical micro guide wires

Abstract

The application discloses a precision wire drawing device for medical micro guide wire processing and relates to the technical field of medical micro guide wire processing equipment. The precision wire drawing device comprises a rack, a first wire drawing die, a first traction wheel, a floating tension wheel, a second wire drawing die and a second traction wheel. A differential power assembly, a tension feedback assembly and a bidirectional friction adjusting assembly are arranged on the rack. The floating tension wheel generates displacement with the change of guide wire tension and drives the bidirectional friction adjusting assembly to act through the tension feedback assembly. The friction resistance of the corresponding output end of the differential mechanism is selectively changed, the speed difference of the two traction wheels is corrected, the tension fluctuation between the stages and the risk of wire breakage are reduced, and the drawing stability and size consistency of the micro guide wire are improved.

Description

Technical Field

[0001] This invention relates to the field of medical microwire processing equipment technology, specifically to a precision wire drawing device for medical microwire processing. Background Technology

[0002] Medical microwires typically have small diameters, high flexibility, and high dimensional accuracy requirements. During processing, they require gradual diameter reduction through drawing dies to achieve the required wire diameter and surface quality. To reduce the amount of plastic deformation caused by a single drawing, multiple drawing dies are usually used in actual processing for staged drawing, with traction mechanisms set between different drawing stages.

[0003] Because the cross-sectional area of ​​the medical microguidewire changes after passing through each drawing die, the required guidewire speed for adjacent drawing stages is not the same. Existing multi-stage drawing equipment typically uses multiple independent drive mechanisms to drive different traction wheels, or controls the rotational speed of different traction wheels through a pre-set fixed transmission ratio.

[0004] When multiple independent drive mechanisms are used, the equipment has more drive components and control components, and the overall structure and control method are more complex. When a fixed transmission ratio is used for traction, although different traction speeds can be formed according to the theoretical diameter reduction ratio of the drawing die, the actual processing is affected by factors such as the fluctuation of the raw yarn size, the wear of the drawing die, the lubrication status, and the slippage of the traction wheel. The actual amount of yarn fed and taken out between adjacent traction wheels is prone to deviation.

[0005] When the traction speed of the subsequent stage is relatively high, the tension of the micro-guide wire between adjacent drawing stages gradually increases, which can easily cause local necking or even wire breakage. When the traction speed of the subsequent stage is relatively insufficient, the micro-guide wire is prone to slack, affecting its stability when entering the subsequent drawing die. Therefore, a precision drawing device with a relatively simple structure is needed, which can adjust the speed relationship between adjacent traction wheels according to the actual tension state of the micro-guide wire between stages. Summary of the Invention

[0006] The purpose of this invention is to provide a precision wire drawing device for medical microwire processing, which distributes power to the traction wheels of adjacent wire drawing stages through a differential gear, and uses a floating tensioning mechanism located between adjacent wire drawing stages to form mechanical tension feedback, so that the rotational speed between adjacent traction wheels can be differentially corrected according to the actual tension state of the microwire.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A precision wire drawing device for medical microwire processing includes a frame. Along the wire drawing direction of the medical microwire, a first wire drawing die, a first traction wheel, a floating tension wheel, a second wire drawing die, and a second traction wheel are sequentially arranged on the frame. The frame also includes a differential power assembly, a tension feedback assembly, and a bidirectional friction adjustment assembly. The differential power assembly includes a differential gear, with a first output shaft and a second output shaft at its two output ends, respectively. The first and second output shafts are respectively connected to the first and second traction wheels. The tension feedback assembly includes a floating tension wheel and an adjusting rack, with the floating tension wheel connected to the adjusting rack. The bidirectional friction adjustment assembly is connected to the adjusting rack.

[0009] Furthermore, the bidirectional friction adjustment assembly includes a bidirectional adjustment rod, a first friction pressure rod, a second friction pressure rod, a first friction disc, and a second friction disc. The bidirectional adjustment rod is connected to an adjustment rack via a transmission. The first friction pressure rod and the second friction pressure rod are respectively driven and engaged with the two ends of the bidirectional adjustment rod. The first friction pressure rod is positioned opposite to the first friction disc, and the second friction pressure rod is positioned opposite to the second friction disc. The first friction disc and the second friction disc are respectively mounted on the first output shaft and the second output shaft.

[0010] Furthermore, the first traction wheel is fixedly mounted on the first traction shaft, and a first clamping wheel is provided on one side of the first traction wheel; the second traction wheel is fixedly mounted on the second traction shaft, and a second clamping wheel is provided on one side of the second traction wheel; the medical microguidewire is respectively passed between the first traction wheel and the first clamping wheel and between the second traction wheel and the second clamping wheel.

[0011] Furthermore, a first output sprocket is fixedly mounted on the first output shaft, and a second output sprocket is fixedly mounted on the second output shaft. The first output shaft is connected to the first traction shaft via a first transmission chain, and the second output shaft is connected to the second traction shaft via a second transmission chain. The chain transmission ratio between the first output shaft and the first traction shaft is different from the chain transmission ratio between the second output shaft and the second traction shaft.

[0012] Furthermore, the tension feedback assembly also includes a tension guide frame, a tension wheel frame, a tension spring, a pretension adjustment plate, a tension rack, and a tension seat. The floating tension wheel is rotatably mounted on the tension wheel frame, the tension wheel frame is mounted on the tension seat, the tension seat is vertically slidably mounted on the tension guide frame, the pretension adjustment plate is adjustablely mounted on the tension guide frame, the tension spring is mounted between the pretension adjustment plate and the tension seat, and the tension rack is fixedly connected to the tension seat.

[0013] Furthermore, the tension feedback assembly also includes a first conversion gear and a second conversion gear, both of which are rotatably mounted on the tension guide frame. The first conversion gear meshes with the tension rack, and the first conversion gear is connected to the second conversion gear in a transmission manner. The second conversion gear meshes with the adjusting rack.

[0014] Furthermore, a linkage pin is provided on the adjusting rack, and a guide hole extending along its length is provided on the bidirectional adjusting rod, with the linkage pin slidably disposed in the guide hole.

[0015] Furthermore, the bidirectional friction adjustment assembly also includes a first pressing member, a second pressing member, a first adjusting spring, and a second adjusting spring. The first pressing member is disposed on the first friction rod, the second pressing member is disposed on the second friction rod, the first adjusting spring is sleeved on the first friction rod, and the second adjusting spring is sleeved on the second friction rod.

[0016] Furthermore, each end of the bidirectional adjusting rod is provided with a pushing slope, the first pushing member and the second pushing member respectively abut against the pushing slopes at both ends of the bidirectional adjusting rod, and the first friction rod and the second friction rod are both slidably mounted on the adjusting bracket.

[0017] Furthermore, the adjustment bracket is mounted on the transmission box, the first friction disc is coaxially and fixedly connected to the first output shaft, the second friction disc is coaxially and fixedly connected to the second output shaft, and a drive motor is mounted on the transmission box, with the output end of the drive motor being connected to the input end of the differential.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention provides a first traction wheel and a second traction wheel on the discharge side of the first drawing die and the second drawing die respectively, so that the drawing process of each stage is provided by the corresponding traction wheel, which reduces the accumulation of drawing resistance to the end in the multi-stage drawing process, reduces the risk of local necking or wire breakage of the medical micro guidewire after the diameter reduction of the later stage due to excessive axial tension, and at the same time helps to improve the stability of the multi-stage drawing process.

[0020] (2) The present invention uses a differential to distribute power to the first traction wheel and the second traction wheel, so that the two traction wheels can form a mutually related traction motion under the same power source. While reducing the number of independent drive mechanisms and simplifying the device structure, it provides a structural basis for the redistribution of the rotational speed between the first traction wheel and the second traction wheel, thereby adapting to the traction speed requirements between different drawing stages.

[0021] (3) The present invention sets a floating tension wheel between the first traction wheel and the second drawing die. The floating tension wheel is displaced by the change of tension of the medical micro guidewire, which elastically buffers the difference in guidewire length generated instantaneously between adjacent drawing stages. The displacement of the floating tension wheel is converted and transmitted to the bidirectional friction adjustment component through the tension feedback component, so that the tension change of the guidewire between stages can directly form mechanical feedback.

[0022] (4) The present invention selectively increases the friction resistance of the output end of the differential according to the different offset directions of the floating tension wheel by using a bidirectional friction adjustment component, so as to redistribute the speed of the two output ends of the differential accordingly, thereby correcting the actual traction speed difference between the first traction wheel and the second traction wheel in both directions, thereby reducing the interstage tension fluctuation caused by factors such as wire drawing die wear, lubrication state changes, raw wire size fluctuation and traction slippage, and improving the stability and dimensional consistency of the continuous drawing process of medical microguide wire. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram showing the combination of the medical microguidewire and the first traction wheel, and the tension feedback component of the present invention.

[0025] Figure 3 This is a schematic diagram of the differential power assembly and tension feedback assembly of the present invention;

[0026] Figure 4 This is a partial structural schematic diagram of the tension feedback component of the present invention;

[0027] Figure 5 This is a schematic diagram of the bidirectional friction adjustment component of the present invention;

[0028] Figure 6 This is a schematic diagram showing the assembly of the transmission box, tension guide frame, tension wheel frame, and tension rack of the present invention;

[0029] Figure 7 This is a schematic diagram of the cooperation between the bidirectional adjusting rod and the adjusting rack of the present invention;

[0030] Figure 8 This is a schematic diagram of the differential, first output shaft and second output shaft of the present invention.

[0031] Reference numerals: 1. Frame; 2. Medical microguidewire; 3. First drawing die; 4. Second drawing die; 5. First traction wheel; 6. First pressure wheel; 7. First traction shaft; 8. Second traction wheel; 9. Second pressure wheel; 10. Second traction shaft; 11. First output sprocket; 12. Second output sprocket; 13. First transmission chain; 14. Second transmission chain; 15. Transmission box; 16. Adjusting bracket; 17. Floating tension wheel; 18. Tensioning guide frame; 19. Tensioning wheel frame; 20. Tensioning spring; 21. Pre-tensioning adjustment plate; 22. Tension rack; 23. First conversion gear; 24. Second conversion gear 25. Gear; 26. Tensioner seat; 27. Differential; 28. Adjusting rack; 29. ​​Two-way adjusting rod; 30. Guide elongated hole; 31. First pressing component; 32. Second pressing component; 33. First adjusting spring; 34. Second adjusting spring; 35. First friction pressure rod; 36. Second friction pressure rod; 37. First friction disc; 38. Second friction disc; 39. Drive motor; 40. Linkage pin; 41. First output shaft; 42. Second output shaft; 43. First driven sprocket; 44. Second driven sprocket; 101. Differential power assembly; 102. Tension feedback assembly; 103. Two-way friction adjustment assembly. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0033] like Figures 1 to 8 As shown, a precision wire drawing device for medical microwire processing includes a frame 1, through which a medical microwire 2 is drawn and conveyed along the length of the frame 1. The frame 1 is equipped with a differential power assembly 101, a tension feedback assembly 102, and a bidirectional friction adjustment assembly 103.

[0034] Along the drawing direction of the medical microguidewire 2, the frame 1 is sequentially equipped with a first drawing die 3, a first traction wheel 5, a floating tension wheel 17, a second drawing die 4, and a second traction wheel 8. The medical microguidewire 2 first passes through the first drawing die 3 for the first stage of diameter reduction, is then pulled by the first traction wheel 5, passes around the floating tension wheel 17, and then passes through the second drawing die 4 for the second stage of diameter reduction. Subsequently, it is pulled by the second traction wheel 8.

[0035] The first traction shaft 7 is rotatably mounted on the frame 1. The first traction wheel 5 is fixedly mounted on the first traction shaft 7. A first clamping wheel 6 is provided on one side of the first traction wheel 5. The first clamping wheel 6 cooperates with the first traction wheel 5 to pull the medical microguidewire 2. The second traction shaft 10 is rotatably mounted on the frame 1. The second traction wheel 8 is fixedly mounted on the second traction shaft 10. A second clamping wheel 9 is provided on one side of the second traction wheel 8. The second clamping wheel 9 cooperates with the second traction wheel 8 to pull the medical microguidewire 2.

[0036] The differential power assembly 101 includes a differential 26, a drive motor 38, a first output shaft 40, and a second output shaft 41. A transmission housing 15 is fixedly mounted on the frame 1. The differential 26 is disposed within the transmission housing 15, and the drive motor 38 is mounted on the transmission housing 15. The output end of the drive motor 38 is connected to the input end of the differential 26. The two output ends of the differential 26 are respectively connected to the first output shaft 40 and the second output shaft 41.

[0037] A first output sprocket 11 is fixedly mounted on the first output shaft 40, and a first driven sprocket 42 is fixedly mounted on the first traction shaft 7. The first output sprocket 11 is connected to the first driven sprocket 42 via a first transmission chain 13. A second output sprocket 12 is fixedly mounted on the second output shaft 41, and a second driven sprocket 43 is fixedly mounted on the second traction shaft 10. The second output sprocket 12 is connected to the second driven sprocket 43 via a second transmission chain 14.

[0038] The first drawing die 3 and the second drawing die 4 are respectively provided with a first traction wheel 5 and a second traction wheel 8 on the discharge side, so that the first traction wheel 5 mainly bears the drawing load corresponding to the first drawing die 3, and the second traction wheel 8 mainly bears the drawing load corresponding to the second drawing die 4, thereby reducing the accumulation of drawing resistance to the subsequent stage when multiple drawing dies are continuously drawn by a single traction structure at the end.

[0039] The transmission ratio between the first output sprocket 11 and the first driven sprocket 42 is different from the transmission ratio between the second output sprocket 12 and the second driven sprocket 43, causing the linear velocity of the second traction wheel 8 to be higher than that of the first traction wheel 5. This is to accommodate the change in linear velocity of the medical microguidewire 2 after it has been further reduced in diameter by the second drawing die 4.

[0040] The tension feedback assembly 102 is disposed between the first traction wheel 5 and the second drawing die 4. The tension feedback assembly 102 includes a floating tension wheel 17, a tension guide frame 18, a tension wheel frame 19, a tension spring 20, a pretension adjustment plate 21, a tension rack 22, a first conversion gear 23, a second conversion gear 24, a tension seat 25, and an adjustment rack 27.

[0041] The tension guide frame 18 is positioned above the transmission box 15. The tension seat 25 is vertically slidably mounted on the tension guide frame 18. The tension wheel frame 19 is mounted on the tension seat 25, and the floating tension wheel 17 is rotatably mounted on the tension wheel frame 19. The preload adjustment plate 21 is vertically slidably mounted on the tension guide frame 18. The tension spring 20 is positioned between the preload adjustment plate 21 and the tension seat 25. The tension guide frame 18 has a limiting part that cooperates with the tension seat 25, and the tension seat 25 initially abuts against the limiting part.

[0042] When adjusting the height of the pretension adjustment plate 21, the tensioning seat 25 remains in its initial position under the constraint of the limiting part. The pretension adjustment plate 21 moves relative to the tensioning seat 25, causing a change in the distance between the pretension adjustment plate 21 and the tensioning seat 25, thereby changing the initial compression of the tension spring 20 and adjusting the pretension force exerted by the tension spring 20 on the tensioning seat 25. After the pretension adjustment is completed, the limiting state between the tensioning seat 25 and the limiting part is released, and the tensioning seat 25 can slide along the tension guide frame 18 according to the tension change of the medical microguidewire 2.

[0043] The medical microguidewire 2 is led out by the first traction wheel 5, passes around the floating tension wheel 17, and then enters the second drawing die 4. When there is a deviation between the wire feeding speed of the first traction wheel 5 and the wire taking speed formed by the second traction wheel 8 through the second drawing die 4, the tension of the medical microguidewire 2 located between the first traction wheel 5 and the second drawing die 4 changes. The floating tension wheel 17 is vertically displaced according to the tension change of the medical microguidewire 2, and drives the tension seat 25 to move along the tension guide frame 18 through the tension wheel frame 19.

[0044] When the tensioning seat 25 moves, the compression of the tensioning spring 20 changes. The tensioning spring 20 provides elastic buffering for the displacement of the floating tensioning wheel 17 and makes the floating tensioning wheel 17 tend to return to the predetermined tension position.

[0045] Tension rack 22 is fixedly connected to tension seat 25. First conversion gear 23 meshes with tension rack 22, and first conversion gear 23 is drivenly connected to second conversion gear 24. Second conversion gear 24 meshes with adjusting rack 27. When tension seat 25 moves, it drives tension rack 22 to move synchronously. Tension rack 22 drives adjusting rack 27 to move through first conversion gear 23 and second conversion gear 24, converting the vertical displacement of floating tension wheel 17 into the lateral displacement of adjusting rack 27.

[0046] The bidirectional friction adjustment assembly 103 includes an adjustment bracket 16 and a bidirectional adjustment rod 28. The adjustment bracket 16 is mounted on the transmission box 15, and the bidirectional adjustment rod 28 is slidably mounted on the adjustment bracket 16. A linkage pin 39 is provided on the adjustment rack 27, and a guide hole 29 extending along its length is provided on the bidirectional adjustment rod 28. The linkage pin 39 is slidably mounted in the guide hole 29. When the adjustment rack 27 undergoes a small displacement, the linkage pin 39 slides relative to the guide hole 29, and the bidirectional adjustment rod 28 maintains its original position. When the linkage pin 39 moves to one end of the guide hole 29 and abuts against that end, the adjustment rack 27 continues to move, which in turn drives the bidirectional adjustment rod 28 to move along its length via the linkage pin 39.

[0047] When the medical microguidewire 2 experiences a small instantaneous tension fluctuation due to the empty stroke formed by the guide hole 29, the movement of the floating tension wheel 17 and the elastic deformation of the tension spring 20 provide buffering. When the tension deviation causes the displacement of the floating tension wheel 17 to exceed the range corresponding to the empty stroke, the adjusting rack 27 then drives the bidirectional adjusting rod 28 to perform differential speed adjustment.

[0048] The bidirectional friction adjustment assembly 103 further includes a first pressing member 30, a second pressing member 31, a first adjusting spring 32, a second adjusting spring 33, a first friction rod 34, a second friction rod 35, a first friction disc 36, and a second friction disc 37.

[0049] The first friction rod 34 and the second friction rod 35 are slidably disposed on both sides of the adjusting bracket 16. The first pushing member 30 is fixedly disposed on the first friction rod 34, and the second pushing member 31 is fixedly disposed on the second friction rod 35. The first adjusting spring 32 is sleeved on the first friction rod 34, and the second adjusting spring 33 is sleeved on the second friction rod 35.

[0050] The two ends of the bidirectional adjusting rod 28 form pressing slopes, and the first pressing member 30 and the second pressing member 31 respectively abut against the corresponding pressing slopes at both ends of the bidirectional adjusting rod 28. When the bidirectional adjusting rod 28 moves in the first direction, the pressing slope at one end pushes the first pressing member 30, causing the first friction pressing rod 34 to move toward the first friction disk 36; when the bidirectional adjusting rod 28 moves in the opposite second direction, the pressing slope at the other end pushes the second pressing member 31, causing the second friction pressing rod 35 to move toward the second friction disk 37.

[0051] The first friction disc 36 is coaxially and fixedly connected to the first output shaft 40, and the second friction disc 37 is coaxially and fixedly connected to the second output shaft 41. The first friction rod 34 is disposed opposite to the first friction disc 36, and the second friction rod 35 is disposed opposite to the second friction disc 37. When the first friction rod 34 contacts the first friction disc 36, it applies frictional resistance to the first output shaft 40; when the second friction rod 35 contacts the second friction disc 37, it applies frictional resistance to the second output shaft 41.

[0052] When the bidirectional adjusting rod 28 drives the first pressing member 30 or the second pressing member 31 to move, it applies an elastic pushing force to the corresponding first friction pressing rod 34 or the second friction pressing rod 35 through the first adjusting spring 32 or the second adjusting spring 33, so that the clamping force of the two can gradually change with the movement of the bidirectional adjusting rod 28.

[0053] Since the first output shaft 40 and the second output shaft 41 are respectively connected to the two output ends of the differential 26, when the frictional resistance of either the first friction disc 36 or the second friction disc 37 increases, the speed distribution of the two output ends of the differential 26 changes, and is transmitted to the first traction wheel 5 and the second traction wheel 8 through the first transmission chain 13 and the second transmission chain 14 respectively.

[0054] The transmission ratios of the first conversion gear 23 and the second conversion gear 24, as well as the slope angle between the bidirectional adjusting rod 28 and the first pressing member 30 and the second pressing member 31, are matched according to the allowable floating stroke of the floating tension wheel 17, so that the small displacement of the floating tension wheel 17 can be converted into the adjustment displacement required by the bidirectional friction adjusting assembly 103.

[0055] In operation, the drive motor 38 drives the differential 26 to operate, and the differential 26 outputs power through the first output shaft 40 and the second output shaft 41 respectively. The first output shaft 40 drives the first traction shaft 7 to rotate through the first output sprocket 11, the first transmission chain 13 and the first driven sprocket 42 in sequence, so that the first traction wheel 5 pulls the medical micro guide wire 2 on the discharge side of the first drawing die 3; the second output shaft 41 drives the second traction shaft 10 to rotate through the second output sprocket 12, the second transmission chain 14 and the second driven sprocket 43 in sequence, so that the second traction wheel 8 pulls the medical micro guide wire 2 on the discharge side of the second drawing die 4.

[0056] Under normal wire drawing conditions, the first traction wheel 5 and the second traction wheel 8 rotate, the floating tension wheel 17 is in the predetermined tension position, the linkage pin 39 is in the free stroke range of the guide elongated hole 29, the bidirectional adjusting rod 28 is in the middle position, and the first friction pressure rod 34 and the second friction pressure rod 35 are both in the non-pressurized state.

[0057] When the actual wire-taking speed of the second traction wheel 8 is higher than that of the first traction wheel 5, the tension of the medical microguidewire 2 between the first traction wheel 5 and the second drawing die 4 increases, causing the floating tension wheel 17 to move accordingly. This displacement, through the tension wheel frame 19 and the tension seat 25, drives the tension rack 22 to move. The tension rack 22 then drives the adjusting rack 27 to move via the first conversion gear 23 and the second conversion gear 24. When the linkage pin 39 moves to the corresponding end of the guide hole 29, the adjusting rack 27 drives the bidirectional adjusting rod 28 to move.

[0058] The bidirectional adjusting rod 28 pushes the second friction rod 35 toward the second friction disc 37 via the second pushing member 31 and the second adjusting spring 33, increasing the frictional resistance on the second output shaft 41. The differential 26 then changes the speed distribution between the first output shaft 40 and the second output shaft 41, causing the second traction wheel 8 corresponding to the second output shaft 41 to decelerate relatively, while the first traction wheel 5 corresponding to the first output shaft 40 to accelerate relatively, thereby reducing the actual traction speed difference between the first traction wheel 5 and the second traction wheel 8.

[0059] When the actual wire-taking speed of the second traction wheel 8 is lower than that of the first traction wheel 5, the medical microguidewire 2 between the first traction wheel 5 and the second drawing die 4 tends to loosen, the floating tension wheel 17 moves in the opposite direction, and the tension feedback component 102 drives the bidirectional adjustment rod 28 to move in the opposite direction. The bidirectional adjustment rod 28 pushes the first friction pressure rod 34 toward the first friction disk 36 through the first pushing member 30, which increases the frictional resistance on the first output shaft 40. The differential 26 correspondingly changes the speed distribution between the two output ends, so that the first traction wheel 5 decelerates relatively and the second traction wheel 8 increases relatively.

[0060] Thus, the differential power assembly 101 outputs power to the corresponding power branches of the first traction wheel 5 and the second traction wheel 8 under the same power source, and the two chain drive structures establish a basic traction speed ratio between the first traction wheel 5 and the second traction wheel 8; the tension feedback assembly 102 generates mechanical feedback displacement based on the tension change of the medical microguidewire 2 between the first traction wheel 5 and the second drawing die 4; the bidirectional friction adjustment assembly 103 selectively increases the friction resistance of one of the output ends of the differential 26 according to the different directional displacements output by the tension feedback assembly 102, and performs small-range differential speed correction on the actual traction speed between the first traction wheel 5 and the second traction wheel 8.

[0061] This embodiment uses a two-stage drawing structure as an example. In actual application, more drawing stages can be set according to the number of diameter reductions of the medical microguidewire 2, and corresponding traction structures, tension feedback structures and differential speed adjustment structures can be set between adjacent drawing stages.

[0062] The above are merely preferred embodiments of the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the structural form, transmission form, and specific dimensions without departing from the technical concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A precision wire drawing device for medical microwire fabrication, characterized in that: The device includes a frame (1), on which a first drawing die (3), a first traction wheel (5), a floating tension wheel (17), a second drawing die (4), and a second traction wheel (8) are arranged sequentially along the drawing direction of the medical microguidewire (2). The frame (1) is also equipped with a differential power assembly (101), a tension feedback assembly (102), and a bidirectional friction adjustment assembly (103). The differential power assembly (101) includes a differential (26), and the two output ends of the differential (26) are respectively provided with a first output shaft (40) and a second output shaft (41), and the first output shaft (40) and the second output shaft (41) are respectively connected to the first traction wheel (5) and the second traction wheel (8). The tension feedback assembly (102) includes a floating tension wheel (17) and an adjusting rack (27). The floating tension wheel (17) is connected to the adjusting rack (27) in a driving connection, and the bidirectional friction adjustment assembly (103) is connected to the adjusting rack (27) in a driving connection.

2. The precision wire drawing device for medical microwire processing according to claim 1, characterized in that: The bidirectional friction adjustment assembly (103) includes a bidirectional adjustment rod (28), a first friction pressure rod (34), and a second friction pressure rod (35). The bidirectional adjustment rod (28) is connected to the adjustment rack (27) in a transmission manner. The first friction pressure rod (34) and the second friction pressure rod (35) are respectively connected to the two ends of the bidirectional adjustment rod (28) in a transmission manner.

3. The precision wire drawing device for medical microwire processing according to claim 2, characterized in that: The bidirectional friction adjustment assembly (103) further includes a first friction disk (36) and a second friction disk (37). The first friction disk (36) and the second friction disk (37) are coaxially fixed on the first output shaft (40) and the second output shaft (41), respectively. The first friction rod (34) and the second friction rod (35) are respectively disposed on one side of the first friction disk (36) and the second friction disk (37), and are respectively slidably disposed in the direction toward the corresponding friction disk.

4. The precision wire drawing device for medical microwire processing according to claim 1, characterized in that: The first output shaft (40) is connected to the first traction wheel (5) via the first transmission chain (13), and the second output shaft (41) is connected to the second traction wheel (8) via the second transmission chain (14).

5. The precision wire drawing device for medical microwire processing according to claim 1, characterized in that: The tension feedback assembly (102) further includes a tension guide frame (18), a tension spring (20), a pretension adjustment plate (21), a tension rack (22), and a tension seat (25). The tension seat (25) is slidably disposed on the tension guide frame (18), the floating tension wheel (17) is rotatably disposed on the tension seat (25), the pretension adjustment plate (21) is disposed on the tension guide frame (18), the tension spring (20) is disposed between the pretension adjustment plate (21) and the tension seat (25), and the tension rack (22) is fixedly connected to the tension seat (25).

6. The precision wire drawing device for medical microwire processing according to claim 2, characterized in that: The adjusting rack (27) is provided with a linkage pin (39), and the bidirectional adjusting rod (28) is provided with a guide hole (29) extending along its length direction. The linkage pin (39) is slidably disposed in the guide hole (29).

7. The precision wire drawing device for medical microwire processing according to claim 2, characterized in that: The first friction rod (34) has a first pusher (30) fixed on its upper part, and the second friction rod (35) has a second pusher (31) fixed on its upper part. The two ends of the bidirectional adjusting rod (28) are respectively provided with inclined surfaces. The first pusher (30) and the second pusher (31) are respectively provided with matching inclined surfaces that cooperate with the corresponding inclined surfaces. The inclined surfaces at both ends of the bidirectional adjusting rod (28) slide and abut against the matching inclined surfaces on the first pusher (30) and the second pusher (31).

8. The precision wire drawing device for medical microwire processing according to claim 5, characterized in that: The pre-tightening adjustment plate (21) is slidably mounted on the tensioning guide frame (18) along the vertical direction and can be fixed at different height positions.

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