CN107858746B

CN107858746B - Cardiovascular support electrolytic polishing device

Info

Publication number: CN107858746B
Application number: CN201711087547.XA
Authority: CN
Inventors: 李志永; 严凤洁; 赵鑫; 黄朝霞; 颜红娟
Original assignee: Shandong University of Technology
Current assignee: Shandong University of Technology
Priority date: 2017-11-08
Filing date: 2017-11-08
Publication date: 2020-01-14
Anticipated expiration: 2037-11-08
Also published as: CN107858746A

Abstract

The invention provides an electropolishing device for a cardiovascular stent, which mainly solves the problems of inconsistent polishing effects of inner and outer surfaces, incomplete polishing and the like in the polishing process of the cardiovascular stent. The device mainly comprises a direct current stabilized voltage power supply, a timer switch, an electrolytic polishing tank, a nozzle, a water washing filter, a water washing pump, a water washing tank, an electrolyte pump, an electrolyte tank, an electrolyte filter, a temperature sensor, a lead screw, a heater and a motor. The equipment can realize the machining mode of the double cathodes, form a workpiece clamping mode of cathode-anode-cathode from outside to inside, and greatly solve the problems and defects of the existing polishing equipment after polishing.

Description

Cardiovascular support electrolytic polishing device

Technical Field

The invention relates to the technical field of electrolytic polishing, in particular to an electrolytic polishing device for a cardiovascular stent.

Background

The electrolytic polishing is to polish the surface of a workpiece by taking the workpiece to be polished as an anode and other materials as a cathode in electrolyte with a certain component ratio and utilizing the principle of electrochemical reaction anode dissolution, remove burrs and microscopic bulges on the surface and improve the performance of the workpiece. Compared with mechanical polishing, the electrochemical polishing has the advantages of short processing time, high production efficiency, good repeatability, simple operation and low labor intensity, and the electrochemical polishing can be used for processing hard and brittle materials, soft materials, thin-wall materials, complex-profile workpieces and fine parts which are difficult to process by mechanical polishing, and the problems of scratches, deformation, cold-work hardening layers, metal scraps, abrasive grains embedded into metal surfaces and the like do not exist on the surfaces of the workpieces subjected to electrochemical polishing.

At present, the rapid increase of cardiovascular diseases worldwide has prompted a strong market demand for cardiovascular stents, whose precision and surface integrity have a decisive role in the ease of use of the stent. The cardiovascular stent has the characteristics of complex structure, tiny volume, strict polishing requirement and the like, so that the electropolishing of the cardiovascular stent has certain difficulty. The polished cardiovascular stent of the prior electropolishing device has the problems of inconsistent polishing effect of the inner surface and the outer surface, partial polishing, surface defect, roughness not meeting the requirement, poor polishing efficiency and the like. Aiming at the existing problems, the cardiovascular stent electropolishing device adopting a double-cathode polishing mode is designed.

Disclosure of Invention

Aiming at the problems existing in the polishing of the cardiovascular stent, the invention provides an electropolishing device for the cardiovascular stent, which solves the problems of inconsistent polishing effect of the inner surface and the outer surface of the polished cardiovascular stent, incomplete polishing, poor surface quality after polishing and the like.

The technical scheme of the cardiovascular stent electropolishing device designed by the invention is as follows:

the cardiovascular stent electropolishing device mainly comprises a direct-current stabilized power supply, a timing switch, an electropolishing tank, a nozzle, a water washing filter, a water washing pump, a water washing tank, an electrolyte pump, an electrolyte tank, an electrolyte filter, a temperature sensor, a lead screw, a heater, a temperature controller, a motor, a cathode plate, an anode plate, a guide rail, a limit switch, a cathode plate clamp and the like.

The direct current stabilized voltage power supply can set voltage according to experimental requirements, and the optimal polishing effect is achieved. The DC stabilized voltage power supply is in circuit connection with the cathode plate and the anode plate. The timer switch can determine the supply time of electric energy, control the break-make of power, guarantee polishing time, prevent the polishing time not enough or the condition of throwing excessively.

The electrolytic polishing tank also comprises a horizontal guide rail, an anode plate, an anode clamp, a cathode plate, a cathode clamp, a translation limit switch, a vertical motion guide rail, a vertical limit switch, a temperature sensor, a heater, a temperature controller and other structures. The lower ends of the four vertical guide rails are fixed in the grooves, the two horizontal guide rails are arranged on the vertical guide rails and can move up and down, the motion of the guide rails is controlled by a motor respectively, and limit switches are arranged at the two ends of the vertical guide rails and limit the motion stroke of the horizontal guide rails.

The cathode plate and the anode plate are positioned on the horizontal guide rail and can freely move along the guide rail within the travel range of the limit switches at the two ends of the horizontal guide rail respectively. The cathode plate and the anode plate are respectively provided with a clamp which is coaxial and is used for installing the cathode and the workpiece and ensuring the installation precision. The double-cathode processing method is adopted by the device, two pipe fittings are arranged on the cathode plate and used as cathodes, the blood vessel support is arranged on the anode plate, after the two pipe fittings are respectively arranged, the screw rod is controlled by the motor to further control the cathode plate and the anode plate to be close to each other, finally, the blood vessel support of the anode is completely surrounded by the cathode tube, and after the polished position is reached, a double-cathode processing layout form of the cathode tube, the blood vessel support and the cathode tube is formed from outside to inside. When the cathode and the anode reach a certain position, the cathode and the anode can move along the guide rail in the polishing process, so that the flow of electrolysis is accelerated, and the stirring effect is achieved. After the processing is finished, the horizontal guide rail can be moved and lifted along the vertical guide rail, the cleaning device is started, and the polished cardiovascular stent is cleaned by using the nozzle.

The temperature sensor and the heater temperature controller are positioned in the polishing groove, the cardiovascular stent is polished at a certain temperature to achieve a good polishing effect, and heat is generated in the electrolytic polishing process to increase the temperature. The temperature sensor can monitor the temperature in the tank in real time, once the temperature in the tank changes, the temperature can be fed back to the temperature controller, and the temperature controller can control the heater to work, so that the temperature in the tank is basically in a constant temperature state in the polishing process and is always at the optimal polishing temperature.

The electrolyte circulating system comprises an electrolyte tank, an electrolyte pump and an electrolyte filter. Electrolyte can be continuously supplied to the polishing groove in the polishing process, and meanwhile, the electrolyte in the polishing groove can also return to the electrolyte groove through the filter to form a circulating system, so that the cleaning and flowing of the electrolyte are guaranteed.

The device has the following beneficial effects:

1. the double-cathode polishing method provided by the electrolytic polishing workbench can overcome the defects of inconsistent polishing effect of the inner surface and the outer surface of the cardiovascular stent, incomplete polishing and the like, so that the processing quality is improved, and the surface defects are reduced;

2. after the installation of the cathode and the anode is finished, the cathode and anode clearance is ensured through the mechanical movement of the workbench on the guide rail, the error caused by manual installation is avoided, and the working efficiency and quality are improved.

Drawings

FIG. 1 is a schematic structural diagram of an electropolishing apparatus for cardiovascular stents.

FIG. 2 is a schematic structural diagram of an electrolytic bath of the cardiovascular stent electropolishing device.

FIG. 3 shows the layout of cathode and anode for electro-polishing of cardiovascular stents.

The labels in the figures are: 1-a direct current stabilized voltage supply, 2-an electrolytic polishing tank, 3-a nozzle, 4-a water washing pump, 5-a water washing tank, 6-a motor, 7-a water washing filter, 8-a lead screw, 9-an electrolyte filter, 10-an electrolyte tank, 11-an electrolyte pump, 12-a heater, 13-a temperature controller, 14-a temperature sensor, 15-a timing switch, 16-a horizontal guide rail, 17-an anode plate, 18-an anode clamp, 19-a cathode plate, 20-a cathode clamp, 21-a horizontal limit switch, 22-a vertical guide rail and 23-a vertical limit switch.

Detailed Description

The cardiovascular stent electropolishing apparatus shown in fig. 1 and 2 includes: 1-a direct current stabilized voltage power supply for providing electric energy required by the electropolishing of the cardiovascular stent; 2-an electrolytic polishing tank for providing a required environment for polishing the cardiovascular stent; 3-the nozzle is used for washing the processed cardiovascular stent of the workpiece and cleaning each position of the cardiovascular stent; 4-a washing pump for providing power for circulation of washing liquid; 5-a water washing liquid tank for storing the water washing liquid; 6, a motor provides power for the movement of the screw rod and controls the movement of the screw rod; 7-the water washing filter can filter out impurities in the water washing liquid, so that the water washing liquid is ensured to be clean, and the water washing liquid can be recycled without causing waste and pollution; 8-a screw rod, which drives the cathode plate and the anode plate to do horizontal and vertical reciprocating motion through the control of a motor; 9-an electrolyte filter, which filters out products of the electrolyte central vascular stent after electrolytic polishing, ensures the cleanness of the electrolyte, enables the electrolyte to be recycled and avoids short circuit; 10-an electrolyte tank for providing a storage place for the polishing solution; 11-an electrolyte pump, which is used for continuously pumping the electrolyte into the electrolytic polishing tank; 12-a heater, which keeps the constant temperature state of the electrolyte, the cardiovascular stent can achieve the ideal polishing effect only by polishing at a certain temperature, and the heater can keep the temperature of the polishing solution basically constant; 13-a temperature controller for controlling the working state of the heater, controlling the heater to start working when heating is needed, and disconnecting the heater when heating is not needed; 14-a temperature sensor for measuring the temperature of the polishing solution in real time and transmitting the temperature to a temperature controller; 15-a timing switch is used for determining the supply time of electric energy, the cardiovascular stent is subjected to electrolytic polishing for a certain time, the polishing effect cannot be achieved due to too short time, the defects of over-polishing and the like can occur due to too long time, the on-off of a direct-current stabilized power supply can be controlled by starting the polishing of the timer, and the reasonable polishing time is ensured; 16-horizontal guide rail, which supports and guides the cathode plate and the anode plate to do horizontal movement; 17-anode plate connected with anode of DC stabilized voltage supply; 18-an anode clamp for clamping the cardiovascular stent of the workpiece to be polished; 19-the cathode plate is connected with the negative electrode of the direct current stabilized power supply; 20-a cathode clamp for clamping cathode workpieces, wherein the cathode workpieces comprise two cathode workpieces; 21-horizontal limit switches, which are arranged at two ends of the horizontal guide rail and are used for limiting the movement stroke of the cathode plate and the anode plate; 22-a vertical guide rail for supporting and guiding the vertical movement of the horizontal guide rail; and 23-vertical limit switches which are arranged at two ends of the vertical guide rail and limit the movement stroke in the vertical direction.

During processing, firstly two cathode workpieces are arranged on a cathode clamp (20), a cardiovascular support is arranged on an anode clamp (18) as a workpiece to be polished, after the cathode and anode workpieces are clamped, a motor (6) is turned on, the motor drives a lead screw (8) to move, a cathode plate (19) and an anode plate (17) on a horizontal guide rail (16) are close to each other, the motor (6) is turned off after the cathode workpiece completely surrounds the cardiovascular support, then an electrolyte pump (11) is turned on to pump electrolyte in an electrolyte tank (10) into an electrolytic polishing tank (2), an electrolyte filter (9) can constantly filter the electrolyte in the electrolytic polishing tank in the whole process of polishing the cardiovascular support, then an electrolyte circulating system is formed in the electrolytic polishing tank by pumping, and meanwhile, a temperature sensor (14) and a temperature controller (13) are turned on, setting a required polishing temperature, if the temperature does not meet the requirement, working the heater (12), after the temperature meets the requirement, setting the time of a timer switch (15), turning on the direct-current stabilized power supply (1) to start the cardiovascular stent electropolishing, and when the polishing is finished, automatically disconnecting the direct-current stabilized power supply (1) by the timer switch (15), disconnecting an electrolyte pump (11), stopping electrolyte supply and finishing the polishing work; after polishing, the polished cardiovascular stent needs to be cleaned, a motor (6) needs to be started to separate a cathode plate and an anode plate, the cardiovascular stent is convenient to clean, then a horizontal guide rail is moved out of polishing liquid and moves upwards along the vertical direction, the guide rail is stopped after the polishing liquid rises to a certain distance, a water washing pump (4) is started, the workpiece cardiovascular stent is cleaned by water washing liquid in a water washing liquid tank (5) through a nozzle (3), the cleaned water washing liquid is filtered by a water washing filter (7) and then is recycled, and after the cleaning is finished, the cardiovascular stent is taken out, and the electropolishing of the cardiovascular stent is completed.

The examples of the present invention are given for illustrative clarity and are not intended to limit the embodiments of the present invention. It will be apparent to those skilled in the art that other variations and modifications may be made in the foregoing disclosure without departing from the spirit or essential characteristics of the invention, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention.

Claims

1. An electrolytic polishing device for cardiovascular stents is characterized in that:

the device comprises a direct current stabilized voltage power supply, an electrolytic polishing tank, a nozzle, a water washing pump, a water washing tank, a motor, a water washing filter, a lead screw, an electrolyte filter, an electrolyte tank, an electrolyte pump, a heater, a temperature controller, a temperature sensor, a timing switch, a horizontal guide rail, an anode plate, an anode clamp, a cathode plate, a cathode clamp, a horizontal limit switch, a vertical guide rail and a vertical limit switch, wherein the electrolytic polishing tank adopts a double-cathode electrolytic polishing mode, the clamp on the cathode plate needs to clamp two cathode tubes, a workpiece blood vessel support is clamped on the anode plate, a cathode-anode-cathode clamping mode is formed from outside to inside in space, the electrolytic polishing tank is internally provided with the horizontal and vertical guide rails for supporting and guiding the motion of the cathode plate in the horizontal and vertical directions, and the cathode plate and the anode plate in the polishing tank are driven by, the device can move along the horizontal guide rails respectively, and can realize synchronous movement in the process of electropolishing the cardiovascular stent, so as to play a role in stirring the electrolyte and accelerating the flow of the electrolyte.

2. The electro-polishing device for the blood vessel stent as claimed in claim 1, wherein the polished blood vessel stent can be lifted to remove the blood vessel stent from the polishing solution without being detached, and the nozzles are used for cleaning each part of the blood vessel stent, thereby avoiding secondary pollution.