A nickel-titanium core wire chemical etching device and core wire preparation method

Abstract

The present invention relates to the field of interventional medical device consumables, and specifically to a nickel-titanium core wire chemical etching device and a core wire preparation method, wherein the nickel-titanium core wire chemical etching device comprises a feeding mechanism, an etching mechanism, a traction mechanism and an adjustment mechanism; the feeding mechanism is used to supply the core wire, and one end of the core wire is connected to the traction mechanism in a transmission manner; the etching mechanism is located between the feeding mechanism and the traction mechanism, and the core wire passes through the etching mechanism; the adjustment mechanism comprises a first transmission component and an adjustment component, and the adjustment component is used to adjust the transmission ratio of the first transmission component; the traction mechanism comprises a frame, a traction component for pulling the core wire, and a detection component for detecting the moving length of the core wire, and the traction component pulls the core wire to move through the first transmission component, and the detection component is connected in a transmission manner to the adjustment component. The present invention realizes the function of adjusting the moving speed state of the core wire, and solves the problem that the core wire quality is affected by the insufficient dimensional accuracy of the core wire grinding section.

Description

Technical Field

[0001] The present invention relates to the field of interventional medical device consumables, and in particular to a nickel-titanium core wire chemical etching device and a core wire preparation method. Background Art

[0002] The guidewire is one of the basic instruments of interventional medical engineering equipment. It is a delivery device that delivers therapeutic instruments to designated lesion sites. Its performance directly affects the success of the treatment process. The core part of the guidewire is made of nickel-titanium shape memory alloy, which is suitable for designing a guidewire core wire part with gradual diameter change and plasticity, giving the guidewire good pushing performance, twist control, support force and softness.

[0003] In order to achieve a gradual diameter structure of the nickel-titanium core wire, the prior art mostly uses physical grinding to grind the nickel-titanium core wire to a target size.

[0004] However, in the prior art, when the guide wire is formed, the forming angle and shape of the guide wire may be inconsistent, which affects the product quality.

[0005] To this end, a Chinese patent with authorization announcement number CN109706515B discloses a device and method for preparing a tungsten wire needle tip with a controllable aspect ratio, which utilizes a pulling reciprocating vibration to perform electrochemical etching processing on the tungsten wire to be prepared, and the pulling reciprocating vibration accelerates the diffusion of the electrochemical products generated by the electrochemical etching into the electrolyte, thereby reducing the local electrochemical product concentration in the end formation area of ​​the tungsten wire to be prepared, so as to destroy the formation of a diffusion layer that inhibits the electrochemical reaction rate, thereby improving the processing efficiency of the electrochemical etching; The pulling reciprocating vibration allows the electrochemical reaction to proceed evenly within the vibration area, offsetting the situation where the etching rate decreases with depth below the liquid surface; the pulling reciprocating vibration causes the relative position of the end of the tungsten wire to be prepared and the liquid film to change periodically, expanding the etching processing area, which is beneficial to the formation of probes with a large aspect ratio; and as the electrochemical etching process proceeds, the diameter of the tungsten wire to be prepared in the liquid film is continuously reduced; when the diameter of the tungsten wire to be prepared in the liquid film is reduced to a certain value, the lower end of the tungsten wire to be prepared breaks under the action of gravity to form a tungsten wire needle tip.

[0006] However, the accuracy requirements for guide wires are looser than those for tungsten wire needle tips.

[0007] However, when processing the guide wire, it is necessary to form a diameter gradient structure. The processing steps of grinding and forming are too complicated. Therefore, etching processing is usually used to form the required diameter-changing section.

[0008] During the etching process, the control requirements for the moving speed of the core wire are high. However, the existing equipment only controls the rotation speed of the rotary drive through programming, which usually cannot achieve the specified accuracy. Steps will be formed on the grinding section of the core wire, and the taper of the variable diameter section cannot achieve the specified accuracy, affecting the processing quality of the core wire. Summary of the invention

[0009] In view of the above problems, a nickel-titanium core wire chemical etching device and a core wire preparation method are provided, which solve the problem of insufficient dimensional accuracy of the core wire grinding section affecting the core wire quality through the cooperation of a traction mechanism and an adjustment mechanism.

[0010] In order to solve the problems of the prior art, the present invention provides a nickel-titanium core wire chemical etching device, comprising a feeding mechanism, an etching mechanism, a traction mechanism and an adjusting mechanism; the feeding mechanism is used to supply the core wire, and one end of the core wire is transmission-connected to the traction mechanism; the etching mechanism is located between the feeding mechanism and the traction mechanism, and the core wire passes through the etching mechanism; the adjusting mechanism comprises a first transmission component and an adjusting component, and the adjusting component is used to adjust the transmission ratio of the first transmission component; the traction mechanism comprises a frame, a traction component for pulling the core wire and a detection component for detecting the moving length of the core wire, the traction component is arranged on the frame, and the traction component pulls the core wire to move through the first transmission component, and the detection component is transmission-connected to the adjustment component; in a working state, when the detection component detects that the core wire moves a specified length, the adjustment component adjusts the transmission ratio of the first transmission component, so that the movement of the core wire has an initial state of uniform movement at a first speed, a second state of uniform deceleration, a third state of uniform movement at a second speed and a fourth state of uniform acceleration.

[0011] Preferably, the feed end and the discharge end of the etching mechanism are both provided with a core wire limiting assembly, the core wire limiting assembly includes a first bracket and two rotating shafts rotatably arranged on the first bracket, each rotating shaft is sleeved with a guide wheel, and there is a gap between the two guide wheels for the core wire to pass through, and when the core wire passes through the guide wheel, the guide wheel is pushed to rotate by friction; the detection assembly includes an adjusting ruler, and the adjusting ruler is connected to the guide wheel by transmission; the adjusting ruler is provided with a fixed block, and when the fixed block moves to a specified position, a thrust is applied to the adjusting assembly, and the adjusting assembly adjusts the transmission ratio of the first transmission assembly.

[0012] Preferably, the first transmission component includes a driving wheel, a transmission wheel and a transmission belt; the driving wheel is transmission-connected to the traction component, a mounting frame is sleeved on the driving wheel, a movable seat which can move radially along the driving wheel is provided on the mounting frame, and the number of movable seats is at least three, and the multiple movable seats are distributed in a circular array along the axis of the driving wheel, each movable seat is rotatably provided with a first support wheel for supporting the transmission belt, and the transmission belt is spanned over the first support wheel and the transmission wheel; the transmission wheel is transmission-connected to the traction component; the adjustment component is used to control the multiple movable seats to move radially along the driving wheel.

[0013] Preferably, the adjustment component includes an adjustment wheel, a first elastic member and an adjustment plate; the adjustment wheel is coaxially connected to the first support wheel; the two ends of the first elastic member are respectively connected to the movable seat and the mounting frame; the mounting frame is provided with a one-way limiting component for limiting the moving direction of the movable seat; the adjustment plate is movably arranged on the frame, and the frame has a linear drive component for pushing the adjustment plate to move.

[0014] Preferably, a control component for releasing the restriction on movement of the movable seat by the one-way restriction component is provided on the mounting frame, the control component comprises a push ring, a second elastic member and a movable frame, and the two ends of the second elastic member are respectively connected to the push ring and the movable frame; when the fixed block on the adjusting ruler squeezes the movable frame, the movable frame is pushed to move, and the movable frame releases the restriction on movement of the movable seat by the one-way restriction component.

[0015] Preferably, the one-way limiting assembly includes a card block, a third elastic member and a limit strip; the card block is slidably mounted on the movable seat, the two ends of the third elastic member are respectively connected to the card block and the movable seat, and a slope is provided on the side of the card block away from the axis of the main wheel; the limit strip is connected to the mounting frame, and the movable seat is slidably matched with the limit strip, and at least three card slots are equidistantly provided on the limit strip.

[0016] Preferably, fan blades are sleeved on the rotating shaft; the etching mechanism includes an etching tube and an air inlet pipe, the first end of the air inlet pipe is connected to the etching tube, and the second end of the air inlet pipe is provided with an air guide port aligned with the fan blades.

[0017] Preferably, the discharge end of the etching mechanism is provided with a rotating assembly and a second transmission assembly for controlling the rotation of the core wire; the rotating assembly includes a rotating frame, a second bracket and a second support wheel; the rotating frame is rotatably arranged on the frame, the rotating frame is connected to the rotating shaft through the second transmission assembly, and the second bracket is connected to the rotating frame; the second support wheel is rotatably arranged on the second bracket, and the number of the second support wheels is two, and a gap is provided between the two second support wheels for the core wire to pass through.

[0018] Preferably, the second transmission assembly includes a second transmission shaft, a second bevel gear, a rack and a gear ring; the second transmission shaft is rotatably set on the frame, and a push rod is sleeved on the second transmission shaft; there are two second bevel gears, and the two second bevel gears are respectively sleeved on the rotating shaft and the second transmission shaft, and the two second bevel gears are meshingly connected; the rack is slidably set on the frame, and a guide frame is provided on the rack, and the push rod is slidably matched with the guide frame; the gear ring is sleeved on the rotating frame, and the gear ring is meshingly connected with the rack.

[0019] A method for preparing a nickel-titanium core wire comprises the following steps:

[0020] S1, start the traction component, the traction component pulls the core wire to move through the first transmission component, and the core wire is etched when passing through the etching mechanism; when the detection component detects that the core wire moves a specified distance, the adjustment component adjusts the transmission ratio of the first transmission component, so that the movement speed of the core wire is periodically switched between the initial state, the second state, the third state and the fourth state, and the etching mechanism is started in the second state, the third state and the fourth state to etch the core wire, forming an equal diameter section, a reduced diameter section with a smaller diameter and a reduced diameter section with an increased diameter on the core wire;

[0021] S2, the etched core wire passes through a laser diameter gauge, and when the laser diameter gauge identifies that the diameter of the core wire becomes smaller, the core wire is physically formed by a physical forming system;

[0022] S3, cleaning and air-drying the core wire after physical forming;

[0023] S4, the traction component reels the cleaned and air-dried core wire;

[0024] S5, wrapping and extruding the wound core wire into a guide wire, cutting the extruded guide wire, and sealing the ends of the cut guide wire.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention realizes the function of adjusting the core wire moving speed state through the cooperation of the traction mechanism and the adjustment mechanism. By adjusting the moving speed of the core wire, the processing time of the core wire in the etching mechanism is controlled, thereby forming the required variable diameter section on the core wire.

[0027] The problem that the core wire quality is affected by the insufficient dimensional accuracy of the core wire grinding section is solved.

[0028] The nickel-titanium core wire is chemically etched to form the required core wire structure. The nickel-titanium core wire obtained at this time is still a core wire, and then this core wire can be directly subjected to the physical forming process through the physical forming system, without the need to manually form the core wire. The core wire obtained in this way can be directly subjected to guide wire coating and extrusion. After coating and extrusion, it can be directly cut, sealed at both ends, and hydrophilic coated, which reduces the operating steps of cutting the nickel-titanium core wire to a fixed length, grinding the nickel-titanium core wire, connecting the nickel-titanium core wire, and forming the distal end of the guide wire, thereby greatly reducing labor costs.

[0029] 2. The present invention realizes the function of driving the adjustment component through the detection component through the core wire limit component and the adjustment ruler, so as to achieve the effect of changing the traction speed when the traction length of the core wire reaches a specified value, thereby forming a periodically repeated structural unit on the core wire.

[0030] As the core wire moves, the guide wheel is driven to rotate by friction, and the guide wheel drives the adjustment ruler to move when rotating, and then pushes the adjustment component through the fixed block on the adjustment ruler, and the adjustment component changes the transmission ratio of the first transmission component.

[0031] 3. The present invention realizes the function of driving the movable seat to move through the adjusting wheel, the first elastic member, the adjusting plate, the linear driving assembly and the one-way limiting assembly.

[0032] In the initial state, the fixed block has not moved to the specified position, and the movable seat is in a reset state.

[0033] Then the linear drive assembly drives the adjustment plate to move toward the axis direction close to the driving wheel. During this process, the traction speed enters the second state.

[0034] When the movable seat moves to the end position of its stroke, the drive is stopped and the traction speed enters the third state.

[0035] As the core wire moves, when the fixed block on the adjusting ruler moves to the specified position, the one-way limiting component releases the movement restriction on the movable seat, the linear drive component controls the adjusting plate to gradually reset, and the traction speed enters the fourth state.

[0036] When the adjustment plate completes the reset, the traction speed enters the initial state again. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional schematic diagram of a nickel-titanium core wire chemical etching device of the present invention.

[0038] Figure 2 It is a three-dimensional schematic diagram of an etching mechanism, a traction mechanism and an adjustment mechanism in a nickel-titanium core wire chemical etching device of the present invention.

[0039] Figure 3 It is a three-dimensional schematic diagram of a traction mechanism and an adjustment mechanism in a nickel-titanium core wire chemical etching device of the present invention.

[0040] Figure 4 The present invention Figure 3 A local enlarged schematic diagram of point A in the middle.

[0041] Figure 5 It is a three-dimensional schematic diagram of the coordination of a core wire limiting assembly, a rotating assembly, a second transmission assembly and a detection assembly in a nickel-titanium core wire chemical etching device of the present invention.

[0042] Figure 6 It is a three-dimensional schematic diagram of an adjustment mechanism in a nickel-titanium core wire chemical etching device of the present invention.

[0043] Figure 7It is a three-dimensional schematic diagram of an adjustment component, a linear drive component, a one-way restriction component and a control component in a nickel-titanium core wire chemical etching device of the present invention.

[0044] Figure 8 It is a three-dimensional exploded schematic diagram of an adjustment component, a linear drive component, a one-way restriction component and a control component in a nickel-titanium core wire chemical etching device of the present invention.

[0045] Fig. 9 It is a three-dimensional schematic diagram of the cooperation between a unidirectional restriction component and a movable frame in a nickel-titanium core wire chemical etching device of the present invention.

[0046] Fig.10 It is a three-dimensional exploded schematic diagram of the cooperation between a unidirectional restriction component and a movable frame in a nickel-titanium core wire chemical etching device of the present invention.

[0047] Fig.11 It is a three-dimensional schematic diagram of the internal structure of an etching mechanism in a nickel-titanium core wire chemical etching device of the present invention.

[0048] Fig.12 It is a three-dimensional schematic diagram of a rotating component and a second transmission component in a nickel-titanium core wire chemical etching device of the present invention.

[0049] The numbers in the figure are: 1, feeding mechanism; 2, etching mechanism; 21, core wire limiting assembly; 211, first bracket; 212, rotating shaft; 2121, guide wheel; 2122, fan blade; 22, etching tube; 23, air inlet pipe; 231, air guide port; 24, rotating assembly; 241, rotating frame; 242, second bracket; 243, second supporting wheel; 25, second transmission assembly; 251, second transmission shaft; 2511, push rod; 252, second bevel gear; 253, rack; 2531, guide frame; 254, gear ring; 3, traction mechanism; 31, traction assembly; 311, traction frame; 312, rotating driver; 32, detection assembly; 321, adjustment ruler; 3211, fixing block; 33, bracket; 331 , vertical plate; 332, reciprocating screw; 333, first transmission shaft; 334, first bevel gear; 4, adjusting mechanism; 41, first transmission assembly; 411, driving wheel; 412, transmission wheel; 413, transmission belt; 414, mounting frame; 4141, movable seat; 4142, first support wheel; 42, adjusting assembly; 421, adjusting wheel; 422, first elastic member; 423, adjusting plate; 43, linear drive assembly; 431, connecting plate; 432, linear drive; 44, one-way limiting assembly; 441, block; 442, third elastic member; 443, limit strip; 4431, slot; 45, control assembly; 451, push ring; 452, second elastic member; 453, movable frame; 4533, filling block. DETAILED DESCRIPTION

[0050] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0051] Reference Figure 1-Figure 3 : A nickel-titanium core wire chemical etching device, comprising a feeding mechanism, an etching mechanism 2, a traction mechanism 3 and an adjustment mechanism 4; the feeding mechanism is used to supply the core wire, and one end of the core wire is connected to the traction mechanism 3 in a transmission manner; the etching mechanism 2 is located between the feeding mechanism and the traction mechanism 3, and the core wire passes through the etching mechanism 2; the adjustment mechanism 4 comprises a first transmission component 41 and an adjustment component 42, and the adjustment component 42 is used to adjust the transmission ratio of the first transmission component 41; the traction mechanism 3 comprises a frame, a traction component 31 for pulling the core wire and a detection component 32 for detecting the moving length of the core wire, the traction component 31 is arranged on the frame, and the traction component 31 pulls the core wire to move through the first transmission component 41, and the detection component 32 is connected to the adjustment component 42 in a transmission manner; in a working state, when the detection component 32 detects that the core wire moves a specified length, the adjustment component 42 adjusts the transmission ratio of the first transmission component 41, so that the movement of the core wire has an initial state of uniform movement at a first speed, a second state of uniform deceleration, a third state of uniform movement at a second speed and a fourth state of uniform acceleration.

[0052] The present invention realizes the function of adjusting the core wire moving speed state through the cooperation of the traction mechanism 3 and the adjustment mechanism 4, and achieves the effect of controlling the processing time of the core wire in the etching mechanism 2 by adjusting the moving speed of the core wire, thereby forming the required variable diameter section on the core wire.

[0053] The problem that the traditional equipment cannot control the speed of the core wire to the specified accuracy and thus affects the core wire processing quality is solved.

[0054] The nickel-titanium core wire is chemically etched to form the required core wire structure. The nickel-titanium core wire obtained at this time is still a core wire, and then this core wire can be directly subjected to a hot forming process through a physical forming system. There is no need to manually form the core wire. The core wire obtained in this way can be directly used for guide wire coating and extrusion. After coating and extrusion, it can be directly cut, sealed at both ends, and hydrophilic coated, which reduces the operation steps of cutting the nickel-titanium core wire to a fixed length, grinding the nickel-titanium core wire, connecting the nickel-titanium core wire, and forming the distal end of the guide wire, thereby greatly reducing labor costs.

[0055] By optimizing the production process of hydrophilic guidewires and designing production equipment, and adopting chemical etching and physical forming methods to shape the structure of the nickel-titanium core wire, large-scale and efficient production of hydrophilic guidewires can be achieved.

[0056] The physical forming method may be a physical processing method such as thermoforming or fixture forming.

[0057] The chemical etching apparatus includes a controller for human-machine interaction.

[0058] The etching mechanism 2 is built with a pump body for controlling the movement of the etching solution. Since the etching solution in the etching mechanism will react with the metal, the pump body is made of a plastic structure.

[0059] The pump body is not shown in the figure, and the pump body is electrically connected to the controller.

[0060] The traction assembly 31 includes a traction frame 311 and a rotation driver 312 . The rotation driver 312 is preferably a servo motor. The rotation driver 312 is electrically connected to the controller.

[0061] In working state, the operator first places the rolled nickel-titanium core wire in the unloading system, manually pulls out a section of the core wire and passes it through the etching system, physical forming system, cleaning and drying system, and finally fixes one end of the nickel-titanium core wire on the traction frame 311. After fixation, the traction module starts working.

[0062] The pulling assembly 31 pulls the core wire to move through the first transmission assembly 41 .

[0063] And during the movement of the core wire, the transmission ratio of the first transmission component 41 is adjusted by the adjustment component 42. At this time, the rotation driver 312 only needs to provide a fixed rotation speed, and there is no need to accurately adjust the rotation speed, thereby reducing the output error of the output end.

[0064] The transmission ratio of the first transmission assembly 41 is divided into four states, so that the pulling speed and the moving speed of the core wire also have four states.

[0065] The first state is the initial state, in which the nickel-titanium core wire has a faster pulling speed. In this state, the etching mechanism 2 does not work. When it recognizes that the winding length of the nickel-titanium core wire reaches the set value, it switches to the second state. While switching the state, a signal is sent to the etching mechanism 2, and the etching mechanism 2 works. In this state, the pulling speed gradually slows down, and the winding speed of the nickel-titanium core wire is a uniform deceleration state with a negative acceleration. At this time, the nickel-titanium core wire is etched by the hydrogen fluoride solution to form a diameter-reducing section with a gradually decreasing diameter. When the diameter-reducing section reaches the target length, it switches to the third state, and the pulling speed is reduced. The speed changes from a uniform deceleration state to a uniform speed state, at which time the etching mechanism 2 continues to work to etch the nickel-titanium core wire into equal-diameter sections. When the equal-diameter sections of the nickel-titanium core wire reach the target length, it switches to the fourth state. In this state, the traction speed gradually becomes faster, and the etching mechanism 2 still works. The winding speed of the nickel-titanium core wire is a uniform acceleration state with a positive acceleration. At this time, the nickel-titanium core wire is etched by the hydrogen fluoride solution into a gradually increasing diameter section. When the gradually increasing diameter section of the nickel-titanium core wire reaches the target length, the traction state changes to the first state, that is, the initial state, and the etching mechanism 2 does not work at this time.

[0066] After completing these four states, a chemically etched nickel-titanium core wire structure is obtained. By continuously performing traction work in these four states, multiple repeated etched nickel-titanium core wire structure units can be obtained.

[0067] The speed of pulling the nickel-titanium core wire and the length of the nickel-titanium core wire winding are controlled. After detecting that the core wire moves a specified length, the detection component 32 can adjust the transmission ratio of the first transmission component 41 through the adjustment component 42. Then the controller starts the etching mechanism 2. The etching mechanism 2 contains a hydrogen fluoride HF solution. The hydrogen fluoride solution can chemically react with the nickel-titanium core wire to corrode and dissolve the nickel-titanium core wire. When the pulling speed changes, the controller sends a signal to the pump body, and the pump body starts to work, driving the hydrogen fluoride solution to flow back and forth. The flowing hydrogen fluoride solution contacts the nickel-titanium core wire and chemically etches the nickel-titanium core wire. In the process of etching the nickel-titanium core wire, the adjustment mechanism 4 changes the etching time of the nickel-titanium core wire by controlling the pulling speed, thereby changing the etching degree of the nickel-titanium core wire to form a specified grinding segment structure.

[0068] Reference Figure 3-Figure 5 : The feeding end and the discharging end of the etching mechanism 2 are both provided with a core wire limiting assembly 21, the core wire limiting assembly 21 includes a first bracket 211 and two rotating shafts 212 rotatably arranged on the first bracket 211, each rotating shaft 212 is sleeved with a guide wheel 2121, and there is a gap between the two guide wheels 2121 for the core wire to pass through, when the core wire passes through the guide wheel 2121, the guide wheel 2121 is pushed to rotate by friction; the detection assembly 32 includes an adjusting ruler 321, and the adjusting ruler 321 is transmission-connected with the guide wheel 2121; a fixed block 3211 is provided on the adjusting ruler 321, and when the fixed block 3211 moves to a specified position, a thrust is applied to the adjusting assembly 42, and the adjusting assembly 42 adjusts the transmission ratio of the first transmission assembly 41.

[0069] The present invention realizes the function of driving the adjustment component 42 through the detection component 32 through the core wire limiting component 21 and the adjustment ruler 321, so as to change the pulling speed when the pulling length of the core wire reaches a specified value, thereby forming a periodically repeated structural unit on the core wire.

[0070] As the core wire moves, the guide wheel 2121 is driven to rotate by friction, and the guide wheel 2121 drives the adjustment ruler 321 to move when rotating, and then pushes the adjustment component 42 through the fixed block 3211 on the adjustment ruler 321, and the adjustment component 42 changes the transmission ratio of the first transmission component 41.

[0071] The outer shaft of the guide wheel 2121 is wrapped with a rubber layer, so that the core wire can stably pull the guide wheel 2121 to rotate when moving.

[0072] A bracket 33 is provided in the traction mechanism 3 , and the adjusting ruler 321 is slidably mounted on the bracket 33 . A vertical plate 331 is provided on the bracket 33 , and a reciprocating screw rod 332 is rotatably provided on the vertical plate 331 . The reciprocating screw rod 332 is threadedly connected to the adjusting ruler 321 .

[0073] A first transmission shaft 333 is rotatably provided on the vertical plate 331 , and the first transmission shaft 333 is transmission-connected to the reciprocating screw rod 332 via a pulley and a synchronous belt.

[0074] The first transmission shaft 333 and the rotating shaft 212 are both sleeved with first bevel gears 334 , and the two first bevel gears 334 are meshed and connected.

[0075] In the working state, when the traction component 31 pulls the core wire to move, the guide wheel 2121 rotates under the action of friction, thereby driving the rotating shaft 212 to rotate, and the rotating shaft 212 drives the first transmission shaft 333 to rotate through the first bevel gear 334, and the first transmission shaft 333 drives the reciprocating screw rod 332 to rotate through the synchronous belt, and the reciprocating screw rod 332 drives the adjusting ruler 321 threadedly connected to it to reciprocate within the stop range. When the fixed block 3211 on the adjusting ruler 321 moves to the specified position, a thrust is applied to the adjusting component 42, and the adjusting component 42 changes the transmission ratio of the first transmission component 41 to complete the state switching of the traction speed.

[0076] Reference Figure 2 , Figure 6 and Figure 7 The first transmission component 41 includes a driving wheel 411, a transmission wheel 412 and a transmission belt 413; the driving wheel 411 is connected to the traction component 31 in transmission connection, the driving wheel 411 is sleeved with a mounting frame 414, and the mounting frame 414 is provided with a movable seat 4141 that can move radially along the driving wheel 411, and the number of the movable seats 4141 is at least three, and the multiple movable seats 4141 are distributed in a circular array along the axis of the driving wheel 411, and each movable seat 4141 is rotatably provided with a first supporting wheel 4142 for supporting the transmission belt 413, and the transmission belt 413 is spanned between the first supporting wheel 4142 and the transmission wheel 412; the transmission wheel 412 is connected to the traction component 31 in transmission connection; the adjustment component 42 is used to control the multiple movable seats 4141 to move radially along the driving wheel 411.

[0077] The driving wheel 411, the transmission wheel 412, the transmission belt 413 and the mounting frame 414 of the present invention realize the function of changing the core wire pulling speed.

[0078] A traction wheel is rotatably provided on the traction frame 311, the driving end of the rotary driver 312 is transmission-connected to the driving wheel 411, and the transmission belt 413 is transmission-connected to the traction wheel on the traction frame 311 through a shaft; in the working state, the traction assembly 31 drives the driving wheel 411 to rotate, the driving wheel 411 drives the transmission wheel 412 to rotate through the transmission belt 413, and the transmission wheel 412 drives the traction wheel to rotate, thereby performing the traction operation of the core wire.

[0079] During the traction process, the adjustment component 42 adjusts the position of the movable seat 4141 and the first support wheel 4142 by pushing the movable seat 4141 to move. After completing the adjustment of multiple movable seats 4141 and the first support wheel 4142, the rotation speed of the driving wheel 411 remains unchanged, while the linear speed of the first support wheel 4142 changes, thereby changing the transmission ratio between the driving wheel 411 and the transmission wheel 412 to switch the traction speed.

[0080] Reference Figure 2 , Figure 3 , Figure 6 and Figure 7 : The adjustment component 42 includes an adjustment wheel 421, a first elastic member 422 and an adjustment plate 423; the adjustment wheel 421 is coaxially connected to the first support wheel 4142; the two ends of the first elastic member 422 are respectively connected to the movable seat 4141 and the mounting frame 414; the mounting frame 414 is provided with a one-way limiting component 44 for limiting the moving direction of the movable seat 4141; the adjustment plate 423 is movably arranged on the frame, and the frame is provided with a linear drive component 43 for pushing the adjustment plate 423 to move.

[0081] The present invention realizes the function of driving the movable seat 4141 to move through the adjusting wheel 421 , the first elastic member 422 , the adjusting plate 423 , the linear driving component 43 and the one-way limiting component 44 .

[0082] The linear drive assembly 43 includes a connecting plate 431 and a linear driver 432. The linear driver 432 is connected to the housing of the etching mechanism 2 via the connecting plate 431. The linear driver 432 is preferably a linear cylinder. The linear driver 432 is electrically connected to the controller.

[0083] The adjusting ruler 321 is divided into a first smooth section, a raised section and a second smooth section on the adjusting ruler 321 by the setting of the fixing block 3211 .

[0084] In the working state, when the fixed block 3211 on the adjusting ruler 321 moves to the specified position, a thrust is applied to the one-way restriction component 44, thereby releasing the movement restriction of the one-way restriction component 44 on the movable seat 4141. At this time, the controller sends a signal to the linear driver 432, and the linear driver 432 drives the adjusting plate 423 to intermittently move in the direction away from the axis of the driving wheel 411. After the adjusting wheel 421 loses the squeezing force of the adjusting plate 423, the movable seat 4141 moves in the direction close to the adjusting plate 423 under the elastic force of the first elastic member 422.

[0085] In the initial state, the fixed block 3211 has not moved to the specified position, and the movable seat 4141 is in a reset state.

[0086] Then the linear drive assembly 43 drives the adjustment plate 423 to move toward the axis direction close to the driving wheel 411. During this process, the traction speed enters the second state.

[0087] When the movable seat 4141 moves to the end position of its stroke, the drive is stopped and the traction speed enters the third state.

[0088] As the core wire moves, when the fixed block 3211 on the adjusting ruler 321 moves to the specified position, the one-way limiting component 44 releases the movement restriction on the movable seat 4141, and the linear driving component 43 controls the adjusting plate 423 to gradually reset, and the traction speed enters the fourth state.

[0089] When the adjustment plate 423 completes the reset, the traction speed enters the initial state again.

[0090] Reference Figure 6 and Figure 8 : A control component 45 for releasing the movement restriction of the movable seat 4141 by the one-way restriction component 44 is provided on the mounting frame 414. The control component 45 includes a push ring 451, a second elastic member 452 and a movable frame 453. The two ends of the second elastic member 452 are respectively connected to the push ring 451 and the movable frame 453; when the fixed block 3211 on the adjusting ruler 321 squeezes the movable frame 453, the movable frame 453 is pushed to move, and the movable frame 453 releases the movement restriction of the movable seat 4141 by the one-way restriction component 44.

[0091] The present invention realizes the function of releasing the movement restriction of the movable seat 4141 by the one-way restriction component 44 through the squeezing action of the fixed block 3211 by the push ring 451 and the second elastic member 452 .

[0092] The push ring 451 is in transmission connection with the driving wheel 411. In the working state, when the fixed block 3211 on the adjusting ruler 321 contacts the movable frame 453, the movable frame 453 is squeezed to move the movable frame 453 toward the direction close to the one-way limiting component 44, and then the one-way limiting component 44 releases the movement restriction of the movable seat 4141 through the movable frame 453.

[0093] After the fixed block 3211 is separated from the movable frame 453 , the movable frame 453 can be reset under the elastic force of the second elastic member 452 .

[0094] Reference Figure 8-Figure 10 The one-way limiting assembly 44 includes a clamping block 441, a third elastic member 442 and a limiting strip 443; the clamping block 441 is slidably mounted on the movable seat 4141, and the two ends of the third elastic member 442 are respectively connected to the clamping block 441 and the movable seat 4141, and a slope is provided on the side of the clamping block 441 away from the axis of the main wheel; the limiting strip 443 is connected to the mounting frame 414, and the movable seat 4141 is slidably matched with the limiting strip 443, and at least three clamping grooves 4431 are equidistantly provided on the limiting strip 443.

[0095] The clamping block 441 , the third elastic member 442 and the limiting strip 443 of the present invention realize the function of limiting the moving direction of the movable seat 4141 .

[0096] The movable frame 453 is provided with a filling block 4533 that matches the slot 4431 .

[0097] When the adjusting plate 423 pushes the adjusting wheel 421 to move toward the axial direction close to the driving wheel 411, the adjusting wheel 421 drives the movable seat 4141 and the first supporting wheel 4142 to move. When the inclined surface of the blocking block 441 contacts the limiting strip 443, it is squeezed and contracts. The third elastic member 442 also contracts under the squeezing effect.

[0098] When the locking block 441 is aligned with the next locking slot 4431 , it is again locked with the locking slot 4431 under the elastic force of the third elastic member 442 .

[0099] The driving wheel 411 is in a high-speed rotation state, and the adjustment wheel 421 is squeezed with the adjustment wheels 421 on the multiple movable seats 4141 in turn, so that the adjustment action of the multiple movable seats 4141 can be realized, and the stable adjustment of the acceleration can be achieved through the multiple equidistantly distributed slots 4431, thereby forming a variable diameter section with a specified taper on the core wire.

[0100] When the movable frame 453 moves toward the direction approaching the limiting strip 443 under the squeezing action of the fixed block 3211, the filling block 4533 on the movable frame 453 fills the slot 4431 on the limiting strip 443, thereby preventing the block 441 from being plugged into the slot 4431, thereby releasing the movement restriction of the movable seat 4141 by the one-way restriction component 44.

[0101] Reference Figure 2 and Fig.11 The rotating shaft 212 is sleeved with a fan blade 2122; the etching mechanism 2 includes an etching tube 22 and an air inlet pipe 23, a first end of the air inlet pipe 23 is connected to the etching tube 22, and a second end of the air inlet pipe 23 is provided with an air guide port 231 aligned with the fan blade 2122.

[0102] The fan blades 2122 and the air guide port 231 of the present invention realize the function of blocking and blowing off the solution attached to the surface of the core wire during the etching process.

[0103] The structure of the etching tube 22 is an "O-type" plastic solution tank. The hydrogen fluoride HF solution is located in the etching tube 22. The hydrogen fluoride solution can chemically react with the nickel-titanium core wire, causing the nickel-titanium core wire to be corroded and dissolved. When the traction speed changes, the controller sends a signal to the pump body, and the pump body starts working, driving the hydrogen fluoride solution at the bottom of the etching tube 22 to flow back and forth in the entire etching tube 22. The flowing hydrogen fluoride solution contacts the nickel-titanium core wire and chemically etches the nickel-titanium core wire.

[0104] When the core wire moves, the guide wheel 2121 will rotate under the action of friction, thereby driving the rotating shaft 212 to rotate, and the rotating shaft 212 drives the fan blades 2122 to rotate. The fan blades 2122 push the airflow when rotating. The airflow enters the air inlet pipe 23 from the air guide port 231, and then impacts the core wire under the guidance of the air inlet pipe 23. Due to the surface tension between the etching solution and the surface of the core wire, the airflow can block and blow off the solution attached to the surface of the core wire.

[0105] Reference Figure 2 , Figure 5 and Fig.12 : The discharge end of the etching mechanism 2 is provided with a rotating assembly 24 and a second transmission assembly 25 for controlling the rotation of the core wire; the rotating assembly 24 includes a rotating frame 241, a second bracket 242 and a second support wheel 243; the rotating frame 241 is rotatably arranged on the frame, the rotating frame 241 is transmission-connected to the rotating shaft 212 through the second transmission assembly 25, and the second bracket 242 is connected to the rotating frame 241; the second support wheel 243 is rotatably arranged on the second bracket 242, and the number of the second support wheels 243 is two, and a gap is provided between the two second support wheels 243 for the core wire to pass through.

[0106] The present invention realizes the function of controlling the core wire's self-rotation through the rotating assembly 24 and the second transmission assembly 25, and utilizes the rotating action of the core wire to achieve the effect of shaking off the excess etching solution still adhering to the surface of the core wire after the core wire leaves the etching tube 22.

[0107] In the working state, when the rotating shaft 212 rotates, the rotating frame 241 is driven to rotate through the second transmission assembly 25, and the rotating frame 241 drives the second bracket 242 and the second support wheel 243 to rotate. The friction between the second support wheel 243 and the core wire drives the core wire to rotate, thereby shaking off the excess etching solution that is still adhered to the surface of the core wire after the core wire leaves the etching tube 22. The rotation of the core wire can make the surface of the core wire more evenly contacted with the solution, so that the size of the core wire is more accurate.

[0108] Reference Figure 2 , Figure 5 and Fig.12 The second transmission assembly 25 includes a second transmission shaft 251, a second bevel gear 252, a rack 253 and a gear ring 254; the second transmission shaft 251 is rotatably arranged on the frame, and a push rod 2511 is sleeved on the second transmission shaft 251; there are two second bevel gears 252, and the two second bevel gears 252 are respectively sleeved on the rotating shaft 212 and the second transmission shaft 251, and the two second bevel gears 252 are meshed and connected; the rack 253 is slidably arranged on the frame, and a guide frame 2531 is provided on the rack 253, and the push rod 2511 is slidably matched with the guide frame 2531; the gear ring 254 is sleeved on the rotating frame 241, and the gear ring 254 is meshed and connected with the rack 253.

[0109] The present invention realizes the function of utilizing the rotation of the rotating shaft 212 to control the core wire to perform a reciprocating rotation motion through the second transmission shaft 251 , the second bevel gear 252 , the rack 253 and the gear ring 254 .

[0110] When the rotating shaft 212 rotates, the second bevel gear 252 drives the second transmission shaft 251 to rotate. The second transmission shaft 251 drives the push rod 2511 to rotate, and the push rod 2511 pushes the guide frame 2531 to perform a lifting action.

[0111] The guide frame 2531 drives the rack 253 to move, and then drives the gear ring 254 meshing with the rack 253 to rotate, and the gear ring 254 drives the rotating frame 241 to rotate.

[0112] The push rod 2511 will push the guide frame 2531 to move back and forth as it rotates, thereby controlling the gear ring 254 and the rotating frame 241 to rotate back and forth, thereby continuously twisting the core wire.

[0113] Reference Figure 1-Figure 3 :A method for preparing a nickel-titanium core wire comprises the following steps:

[0114] S1, start the traction component 31, the traction component 31 pulls the core wire to move through the first transmission component 41, and the core wire is etched when passing through the etching mechanism 2; when the detection component 32 detects that the core wire moves a specified distance, the adjustment component 42 adjusts the transmission ratio of the first transmission component 41, so that the movement speed of the core wire is periodically switched between the initial state, the second state, the third state and the fourth state, and the etching mechanism 2 is started in the second state, the third state and the fourth state to etch the core wire, forming an equal diameter section, a reduced diameter section and an increased diameter section on the core wire;

[0115] S2, the etched core wire passes through a laser diameter gauge, and when the laser diameter gauge identifies that the diameter of the core wire becomes smaller, the core wire is physically formed by a physical forming system;

[0116] S3, cleaning and air-drying the core wire after physical forming;

[0117] S4, the traction assembly 31 reels the cleaned and air-dried core wire;

[0118] S5, wrapping and extruding the wound core wire into a guide wire, cutting the extruded guide wire, and sealing the ends of the cut guide wire.

[0119] The physical forming method described in step S2 selects physical means such as thermoforming and fixture forming for processing according to the core wire material and application scenario, and processes the core wire into a specified structure to ensure the performance and reliability of the core wire.

[0120] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the present invention.

[0121] It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

[0122] Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A nickel-titanium core wire chemical etching device, characterized in that: It comprises a feeding mechanism, an etching mechanism (2), a traction mechanism (3) and an adjustment mechanism (4); The feeding mechanism is used to supply the core wire, and one end of the core wire is transmission-connected to the traction mechanism (3); The etching mechanism (2) is located between the feeding mechanism and the pulling mechanism (3), and the core wire passes through the etching mechanism (2); The adjustment mechanism (4) comprises a first transmission assembly (41) and an adjustment assembly (42), wherein the adjustment assembly (42) is used to adjust the transmission ratio of the first transmission assembly (41); The traction mechanism (3) comprises a frame, a traction assembly (31) for pulling the core wire, and a detection assembly (32) for detecting the moving length of the core wire, the traction assembly (31) being arranged on the frame, and the traction assembly (31) pulling the core wire to move via a first transmission assembly (41), and the detection assembly (32) being in transmission connection with the adjustment assembly (42); In a working state, when the detection component (32) detects that the core wire has moved a specified length, the adjustment component (42) adjusts the transmission ratio of the first transmission component (41) so that the movement of the core wire has an initial state of uniform movement at a first speed, a second state of uniform deceleration, a third state of uniform movement at a second speed, and a fourth state of uniform acceleration.

2. A nickel-titanium core wire chemical etching device according to claim 1, characterized in that: The feeding end and the discharging end of the etching mechanism (2) are both provided with a core wire limiting assembly (21), the core wire limiting assembly (21) comprising a first bracket (211) and two rotating shafts (212) rotatably arranged on the first bracket (211), each rotating shaft (212) being sleeved with a guide wheel (2121), a gap being provided between the two guide wheels (2121) for the core wire to pass through, and when the core wire passes through the guide wheel (2121), the guide wheel (2121) is pushed to rotate by friction force; The detection assembly (32) comprises an adjustment ruler (321), and the adjustment ruler (321) is transmission-connected to the guide wheel (2121); A fixed block (3211) is provided on the adjustment ruler (321), and when the fixed block (3211) moves to a specified position, a thrust is applied to the adjustment component (42), and the adjustment component (42) adjusts the transmission ratio of the first transmission component (41).

3. A nickel-titanium core wire chemical etching device according to claim 1, characterized in that: The first transmission assembly (41) comprises a driving wheel (411), a transmission wheel (412) and a transmission belt (413); The driving wheel (411) is drivingly connected to the traction assembly (31); the driving wheel (411) is sleeved with a mounting frame (414); the mounting frame (414) is provided with a movable seat (4141) that can move radially along the driving wheel (411); the number of the movable seats (4141) is at least three; the plurality of movable seats (4141) are distributed in a circular array along the axis of the driving wheel (411); each movable seat (4141) is rotatably provided with a first supporting wheel (4142) for supporting a transmission belt (413); the transmission belt (413) is straddled between the first supporting wheel (4142) and the driving wheel (412); The transmission wheel (412) is in transmission connection with the traction assembly (31); The adjustment assembly (42) is used to control the plurality of movable seats (4141) to move radially along the driving wheel (411).

4. A nickel-titanium core wire chemical etching device according to claim 3, characterized in that: The adjustment assembly (42) comprises an adjustment wheel (421), a first elastic member (422) and an adjustment plate (423); The adjusting wheel (421) is coaxially connected to the first supporting wheel (4142); Two ends of the first elastic member (422) are respectively connected to the movable seat (4141) and the mounting frame (414); A one-way limiting component (44) for limiting the moving direction of the movable seat (4141) is provided on the mounting frame (414); The adjustment plate (423) is movably arranged on the frame, and a linear drive component (43) is provided on the frame for pushing the adjustment plate (423) to move.

5. A nickel-titanium core wire chemical etching device according to claim 4, characterized in that: The mounting frame (414) is provided with a control component (45) for releasing the movement restriction of the movable seat (4141) by the one-way restriction component (44), the control component (45) comprising a push ring (451), a second elastic member (452) and a movable frame (453), and two ends of the second elastic member (452) are respectively connected to the push ring (451) and the movable frame (453); When the fixed block (3211) on the adjusting ruler (321) presses the movable frame (453), the movable frame (453) is pushed to move, and the movable frame (453) releases the movement restriction of the movable seat (4141) by the one-way restriction component (44).

6. A nickel-titanium core wire chemical etching device according to claim 4, characterized in that: The one-way limiting component (44) comprises a clamping block (441), a third elastic member (442) and a limiting strip (443); The clamping block (441) is slidably mounted on the movable seat (4141), two ends of the third elastic member (442) are respectively connected to the clamping block (441) and the movable seat (4141), and a slope is provided on a side of the clamping block (441) away from the axis of the main wheel; The limiting strip (443) is connected to the mounting frame (414), and the movable seat (4141) is slidably matched with the limiting strip (443), and at least three slots (4431) are equidistantly provided on the limiting strip (443).

7. A nickel-titanium core wire chemical etching device according to claim 2, characterized in that: The rotating shaft (212) is sleeved with a fan blade (2122); The etching mechanism (2) comprises an etching tube (22) and an air inlet tube (23); a first end of the air inlet tube (23) is in communication with the etching tube (22), and a second end of the air inlet tube (23) is provided with an air guide port (231) aligned with the fan blade (2122).

8. A nickel-titanium core wire chemical etching device according to claim 2, characterized in that: The discharge end of the etching mechanism (2) is provided with a rotating assembly (24) for controlling the rotation of the core wire and a second transmission assembly (25); The rotating assembly (24) comprises a rotating frame (241), a second bracket (242) and a second supporting wheel (243); The rotating frame (241) is rotatably arranged on the frame, the rotating frame (241) is transmission-connected to the rotating shaft (212) via the second transmission assembly (25), and the second bracket (242) is connected to the rotating frame (241); The second supporting wheel (243) is rotatably arranged on the second bracket (242), and there are two second supporting wheels (243). A gap is provided between the two second supporting wheels (243) for the core wire to pass through.

9. A nickel-titanium core wire chemical etching device according to claim 8, characterized in that: The second transmission assembly (25) comprises a second transmission shaft (251), a second bevel gear (252), a rack (253) and a gear ring (254); The second transmission shaft (251) is rotatably disposed on the frame, and a push rod (2511) is sleeved on the second transmission shaft (251); Two second bevel gears (252) are provided, the two second bevel gears (252) are sleeved on the rotating shaft (212) and the second transmission shaft (251) respectively, and the two second bevel gears (252) are meshedly connected; The rack (253) is slidably arranged on the frame, a guide frame (2531) is arranged on the rack (253), and the push rod (2511) is slidably matched with the guide frame (2531); The gear ring (254) is sleeved on the rotating frame (241), and the gear ring (254) is meshedly connected with the rack (253).

10. A method for preparing a nickel-titanium core wire, using a nickel-titanium core wire chemical etching device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, starting the traction component (31), the traction component (31) pulls the core wire to move through the first transmission component (41), and the core wire is etched when passing through the etching mechanism (2); when the detection component (32) detects that the core wire has moved a specified distance, the adjustment component (42) adjusts the transmission ratio of the first transmission component (41), so that the movement speed of the core wire is periodically switched between an initial state, a second state, a third state, and a fourth state, and the etching mechanism (2) is started in the second state, the third state, and the fourth state to etch the core wire, so that a constant diameter section, a reduced diameter section, and a large diameter reduced diameter section are formed on the core wire; S2, the etched core wire passes through a laser diameter gauge, and when the laser diameter gauge identifies that the diameter of the core wire becomes smaller, the core wire is physically formed by a physical forming system; S3, cleaning and air-drying the core wire after physical forming; S4, the traction component (31) reels the cleaned and air-dried core wire; S5, wrapping and extruding the wound core wire into a guide wire, cutting the extruded guide wire, and sealing the ends of the cut guide wire.

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