Vertical coating production equipment for medical PI catheter

Abstract

The utility model discloses vertical coating production equipment for medical PI (Polyimide) catheters, which comprises a mandrel unwinding and tensioning mechanism, a mandrel winding and unwinding mechanism, a mandrel winding and unwinding mechanism, a mandrel winding and unwinding mechanism, a mandrel winding and unwinding mechanism and a mandrel winding and unwinding mechanism, the uniform coating device is of a vertical structure and is used for uniformly coating PI emulsion on the core shaft and controlling the outer diameter of the core shaft after coating, the uniform coating device comprises a uniform coating mold with a mold hole, and the core shaft penetrates through the mold hole of the uniform coating mold; the vertical curing device is used for performing high-temperature curing molding on the PI emulsion coated on the mandrel; and the winding mechanism is used for winding the core shaft on which the PI pipe layer is formed. The pipe diameter of the catheter can be accurately controlled, the uniformity of the wall thickness of the catheter and the concentricity of the catheter are improved, the production efficiency is high, and medical PI catheters with various required sizes, precise and uniform wall thickness and high strength and concentricity can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of medical catheter production, in particular to a medical PI catheter vertical coating production device. Background Art

[0002] Medical catheters are a general term for tubular products that connect the inside and outside of the human body. They are widely used as passages in drainage, perfusion, drug administration, blood collection, blood transmission, detecting the condition of organisms through sensing elements, and assisting in the introduction of other medical devices. PI medical-grade catheters are high-quality catheter products that are widely used in the medical industry.

[0003] Existing medical catheter production methods generally use extrusion molding equipment and extrusion molding processes. For example, Chinese patent CN215661719U discloses a medical catheter production line, which includes a controller and an extruder, a mold, a vacuum shaping cooling water tank, a diameter gauge, a tractor, and a winder arranged in sequence from front to back. The production process is as follows: the material enters the extruder for plasticization and extrusion, and is extruded into a medical catheter through the mold. The medical catheter enters the vacuum shaping cooling water tank for sizing and cooling. After the medical catheter is pulled out of the vacuum shaping cooling water tank, it enters the diameter gauge for sizing, and is then pulled by the tractor. The medical catheter that exits the tractor enters the winder for winding. The existing extrusion molding process cannot accurately control the tube diameter during the production process, and the wall thickness of the formed catheter is not uniform enough. In addition, it is a horizontal production method, and the concentricity of the product cannot meet high requirements. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a medical PI catheter vertical coating production equipment, which can accurately control the catheter diameter, improve the uniformity of the catheter wall thickness and the concentricity of the catheter, and has high production efficiency. Medical PI catheters of various required sizes, precise and uniform wall thickness, high strength and concentricity can be obtained.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A medical PI catheter vertical coating production equipment, comprising:

[0007] The mandrel unwinding and tensioning mechanism is used to unwind the mandrel and tension the mandrel in motion;

[0008] A uniform coating device, which is a vertical structure, is used to uniformly coat the mandrel with PI emulsion and control the outer diameter after coating. The uniform coating device comprises a uniform coating die with a die hole. The PI emulsion is loaded onto the mandrel part below the uniform coating die. The mandrel moves upward in a vertical direction through the die hole of the uniform coating die.

[0009] A vertical curing device is used to perform high-temperature curing and molding of the PI emulsion coated on the mandrel;

[0010] The winding mechanism is used for winding the core shaft formed with the PI tube layer.

[0011] Furthermore, the mandrel unwinding and tensioning mechanism comprises a winding disk and a material unwinding and tensioning assembly, the mandrel is wound on the winding disk, and the material unwinding and tensioning assembly tensions the mandrel unwinded from the winding disk.

[0012] Furthermore, the device also includes a guide wheel group, and the mandrel can move in a vertical direction under the guidance of the guide wheel group;

[0013] Furthermore, the material unwinding and tensioning assembly includes a plurality of material unwinding and tensioning wheels, the winding disc is driven to rotate by a motor, and the core shaft unwinding from the winding disc sequentially passes around the plurality of material unwinding and tensioning wheels for tensioning.

[0014] Furthermore, the equipment also includes an ultrasonic cleaning device and a catalytic treatment device; the ultrasonic cleaning device is used to ultrasonically clean the mandrel before coating or the mandrel formed with a PI tube layer, and the catalytic treatment device is used to catalytically treat the exhaust gas generated during the high-temperature curing process.

[0015] Furthermore, the uniform coating device also includes a guide plate and a comb plate, the guide plate is provided with a guide groove, the comb plate is provided with a comb groove, the uniform coating mold is arranged between the guide plate and the comb plate, and the core shaft moving in the vertical direction passes through the guide groove of the guide plate, the mold hole of the uniform coating mold, and the comb groove of the comb plate in sequence.

[0016] Furthermore, the uniform coating mold is a movable part. After the PI emulsion is loaded onto the mandrel, the uniform coating mold can move to a certain position along with the mandrel.

[0017] Furthermore, there are multiple uniform coating molds, which are arranged in a horizontal direction in sequence, and the apertures of their mold holes increase in sequence; the core shaft coated with PI emulsion passes through the next adjacent uniform coating mold after passing through the vertical curing device, and undergoes another PI emulsion coating diameter control treatment.

[0018] Furthermore, the winding mechanism includes a winding tension wheel and a winding disk, and the core shaft formed with the PI tube layer is wound by the winding mechanism.

[0019] The method for producing a medical PI catheter based on the above-mentioned equipment comprises the following steps:

[0020] S1, the mandrel unwinding and tensioning mechanism releases the mandrel and tensions the moving mandrel;

[0021] S2, the mandrel enters the uniform coating device, moves in a vertical direction, passes through the die hole of the uniform coating die, and the PI emulsion is loaded to the bottom of the uniform coating die. During the movement of the mandrel, the uniform coating die evenly coats the PI emulsion and controls the coating thickness;

[0022] S3, the mandrel coated with PI emulsion enters the vertical curing device and undergoes high-temperature curing and molding treatment;

[0023] S4, the core shaft with the PI tube layer formed is rolled up by a rolling mechanism.

[0024] In the above method, the core shaft is ultrasonically cleaned before entering the uniform coating device and before being rolled up, and the waste gas generated during the high-temperature curing molding process is catalytically treated by the catalytic treatment device.

[0025] In the above method, the core shaft undergoes multiple coating and diameter control treatments in a multi-pass uniform coating mold and multiple curing treatments in a vertical curing device to obtain a PI tube layer with a desired outer diameter.

[0026] The beneficial effects of the utility model are:

[0027] The utility model innovatively designs a medical PI catheter vertical coating production equipment, which produces PI catheters by combining vertical coating and curing molding. Compared with existing extrusion molding equipment and processes, it can accurately control the catheter diameter, improve the uniformity of the catheter wall thickness, and improve the concentricity of the catheter, thereby improving product quality.

[0028] The utility model adopts a uniform coating die of a vertical structure in the vertical coating process, uniformly coats the core shaft passing through the die hole with PI emulsion and controls the outer diameter after coating, and designs a multi-pass uniform coating die, so that the uniform coating and diameter control of the PI emulsion can be performed step by step for multiple times, the diameter of the catheter can be controlled more accurately, and the uniformity of the catheter wall thickness is greatly improved; in the utility model, the core shaft moves in a vertical direction, passes through the uniform coating die, and is coated with PI emulsion, so that compared with the horizontal production process, the concentricity deviation problem can be avoided, the concentricity of the catheter product is improved, and the product quality is improved.

[0029] The equipment of the utility model has high production efficiency and can obtain medical PI catheters of various required sizes, with precise and uniform wall thickness and high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of a medical PI catheter vertical coating production equipment according to an embodiment of the utility model.

[0031] Figure 2 It is a structural schematic diagram of the medical PI catheter vertical coating production equipment from another perspective of an embodiment of the utility model.

[0032] Figure 3 It is a structural schematic diagram of a uniform coating device in an embodiment of the utility model.

[0033] Figure 4 It is a structural schematic diagram of another viewing angle of the uniform coating device in the embodiment of the utility model.

[0034] Figure 5 It is a partially enlarged structural schematic diagram of the uniform coating device in the embodiment of the utility model.

[0035] Figure 6 It is a schematic structural diagram of the cooperation between the uniform coating die and the mandrel in an embodiment of the utility model.

[0036] In the figure, 1: mandrel unwinding tensioning mechanism, 11: winding disk, 12: unwinding tensioning wheel, 13: winding and unwinding cabinet; 2: ultrasonic cleaning device, 21: front cleaning line, 22: rear cleaning line; 3: uniform coating device, 31: vertical frame, 32: guide plate, 321: guide groove, 33: combing plate, 331: combing groove, 34: uniform coating mold; 4: vertical curing device; 5: catalytic treatment device; 6: winding mechanism, 61: winding tensioning wheel, 62: winding disk, 63: wire diameter testing device; 71: upper guide wheel, 72: lower active guide wheel, 73: lower driven guide wheel, 74: guide disk, 75: upper guide wheel frame; 8: mandrel; 9: electric cabinet. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0038] like Figures 1 to 6 A preferred embodiment of a medical PI catheter vertical coating production equipment is shown, which includes a core shaft unwinding and tensioning mechanism 1, an ultrasonic cleaning device 2, a uniform coating device 3, a vertical curing device 4, a catalytic treatment device 5 and a winding mechanism 6.

[0039] Specifically, the mandrel unwinding tensioning mechanism 1 includes a coiling disc 11 and a material unwinding tensioning assembly installed on a winding and unwinding cabinet 13. A mandrel 8 is wound on the coiling disc 11, and the material unwinding tensioning assembly tensions the mandrel 8 released from the coiling disc 11. In this embodiment, the material unwinding tensioning assembly includes a plurality of material unwinding tensioning wheels 12. The coiling disc 11 is driven to rotate by a motor installed in the winding and unwinding cabinet 13, and the mandrel 8 released from the coiling disc 11 is tensioned by passing through the plurality of material unwinding tensioning wheels 12 in sequence. The mandrel 8 tensioned by the material unwinding tensioning assembly moves in a horizontal direction.

[0040] In this embodiment, the ultrasonic cleaning device 2 is arranged behind the roll-up and unwinding cabinet 13, and the ultrasonic cleaning device 2 includes two parallel cleaning lines, namely the front cleaning line 21 and the rear cleaning line 22, each cleaning line includes an ultrasonic generator, a detergent cleaning area, a pure water cleaning area and a drying area, and the ultrasonic wave generated by the ultrasonic generator is transmitted to the detergent cleaning area and the pure water cleaning area to realize ultrasonic cleaning. The ultrasonic cleaning device is a conventional device, and its specific structure is not described in detail here.

[0041] The mandrel 8 after being tensioned by the material discharge tensioning assembly enters horizontally into the front cleaning line of the ultrasonic cleaning device 2, and is cleaned by ultrasonic wave to remove impurities on the surface of the mandrel that may affect the coating effect.

[0042] The device also includes a guide wheel group, which includes an upper guide wheel 71, a lower active guide wheel 72 and a lower driven guide wheel 73; the uniform coating device 3 is installed in a vertical frame 31; the lower active guide wheel 72 and the lower driven guide wheel 73 are installed on the vertical frame 31; and a plurality of guide plates 74 are also installed on the vertical frame 31; the vertical curing device 4 is arranged above the vertical frame 31, and the upper guide wheel 71 is installed on the upper guide wheel frame 75 located above the vertical curing device 4. In this embodiment, the number of the lower driven guide wheels 73 is set to two, which are respectively located in the front upper part and the rear upper part of the lower active guide wheel 72, and the lower active guide wheel 72 is driven by a motor.

[0043] After ultrasonic cleaning, the core shaft 8 is guided by the guide plate 74 and then by the lower active guide wheel 72, and then moves in a vertical direction for vertical coating.

[0044] The uniform coating device 3 is a vertical structure, which is used to uniformly coat the mandrel with PI emulsion and control the outer diameter after coating. The uniform coating device 3 includes a guide plate 32, a comb plate 33 and a uniform coating die 34, wherein the uniform coating die 34 is arranged between the guide plate 32 and the comb plate 33, wherein the guide plate 32 is provided with a guide groove 321 extending along its length direction, wherein the comb plate 33 is provided with a plurality of comb grooves 331 arranged along the length direction, wherein the uniform coating die 34 is provided with a plurality of uniform coating dies 34, wherein the plurality of uniform coating dies 34 are sequentially arranged in a horizontal direction (left-right direction), and the apertures of the die holes thereof are sequentially increased. The mandrel moving in the vertical direction sequentially passes through the guide groove 321 of the guide plate 32, the die hole of the uniform coating die 34, and the comb groove 331 of the comb plate 33. The PI emulsion is fed to the mandrel portion below the uniform coating die 34. The uniform coating mold 34 is a movable part. When not working, the uniform coating mold 34 is placed on the guide plate 32 . After the PI emulsion is loaded onto the mandrel 8 , the uniform coating mold 34 can move with the mandrel 8 to the comb plate 33 and be blocked by the comb plate 33 .

[0045] The mandrel 8 passes vertically upward through a uniform coating mold 34, undergoes a PI emulsion coating, enters the vertical curing device 4 for high-temperature curing treatment, and then moves downward through the upper guide wheel 71. Under the guidance of the lower driven guide wheel 73 and the lower active guide wheel 72, it passes through the next adjacent uniform coating mold 34, undergoes another PI emulsion coating diameter control treatment, and then passes through the combing groove 331 corresponding to the combing plate 33 and enters the vertical curing device 4 again for another high-temperature curing treatment. In this way, a mandrel 8 passes through multiple uniform coating molds 34 arranged in sequence, undergoes multiple coating diameter control treatments and multiple high-temperature curing treatments. In this process, in order to achieve more orderly mandrel guiding, the upper guide wheel 71 and the lower driven guide wheel 73 are provided with a plurality of grooves for the mandrel 8 to pass around.

[0046] The vertical curing device 4 includes a plurality of curing furnaces to perform high-temperature curing and molding on the PI emulsion coated on the core shaft 8 .

[0047] During the high-temperature curing molding process, some waste gas is generated. Each curing furnace of the vertical curing device 4 is connected to the catalytic treatment device 5 through a pipeline. Under the action of the fan, the waste gas enters the catalytic treatment device 5, and the catalyst in the catalytic treatment device 5 purifies the waste gas.

[0048] The mandrel formed with the PI tube layer of the required tube diameter enters the post-cleaning line 22 of the ultrasonic cleaning device 2 to undergo ultrasonic cleaning.

[0049] The winding mechanism 6 includes a winding tension wheel 61 and a winding disk 62, and the mandrel formed with the PI tube layer is wound by the winding mechanism 6. In addition, a wire diameter testing device 63 is also provided at the winding mechanism to test the outer diameter of the PI tube layer.

[0050] The device also includes an electric cabinet 9 to control various mechanisms and devices.

[0051] The method for producing a medical PI catheter by a vertical coating method using the above-mentioned equipment comprises the following steps:

[0052] The coiling disc 11 in the mandrel unwinding and tensioning mechanism 1 unwinds the mandrel 8, and the mandrel 8 passes through the multiple unwinding tensioning wheels 12 in sequence for tensioning;

[0053] The mandrel 8 moves in a horizontal direction and enters the front cleaning line of the ultrasonic cleaning device 2, where impurities on the mandrel that affect the coating effect are removed by ultrasonic cleaning;

[0054] After ultrasonic cleaning, the mandrel 8 is guided by the guide plate 74 and then by the lower active guide wheel 72, and then moves vertically upward, passing through the guide groove 321 of the guide plate 32, the mold hole of the uniform coating mold 34, and the corresponding comb groove 331 on the comb plate 33 in sequence; the PI emulsion is loaded onto the mandrel part below the uniform coating mold 34; the loading method can be manual coating or other methods. During the continuous movement of the mandrel 8, the uniform coating mold 34 moves with the mandrel 8 to the comb plate 33 and is blocked; and during the continuous movement of the mandrel 8, the uniform coating mold 34 evenly coats the PI emulsion and controls the coating thickness.

[0055] The mandrel 8 coated with PI emulsion enters the vertical curing device 4 and undergoes high-temperature curing and molding treatment;

[0056] The mandrel 8 passes vertically upward through a uniform coating mold 34, undergoes a PI emulsion coating, enters the vertical curing device 4 for high-temperature curing treatment, and then moves downward through the upper guide wheel 71. Under the guidance of the lower driven guide wheel 73 and the lower active guide wheel 72, it passes through the next adjacent uniform coating mold 34, undergoes another PI emulsion coating diameter control treatment, and then passes through the combing groove 331 corresponding to the combing plate 33 and enters the vertical curing device 4 again for another high-temperature curing treatment. In this way, a mandrel 8 passes through multiple uniform coating molds 34 arranged in sequence, undergoes multiple coating diameter control treatments and multiple high-temperature curing treatments;

[0057] The number of uniform coating dies can be set according to demand, such as 20, 30, or 40, so as to perform coating diameter control processing for the corresponding number of passes; the aperture of each die can be designed according to the required pipe diameter;

[0058] In the above process, the feeding operation of the lower mandrel part of each corresponding uniform coating mold is intermittent, a certain amount is fed at a time, and when it is used up, it is fed again;

[0059] In the present invention, the uniform coating die 34 is movable and has a self-centering function, so that products with more uniform wall thickness and higher concentricity can be obtained; during the entire coating process, the best state is that the uniform coating die 34 is suspended at a certain position between the guide plate 32 and the comb plate 33, so that the product quality obtained is better;

[0060] The core shaft formed with the PI tube layer moves horizontally after being guided by the guide plate 74, enters the post-cleaning line of the ultrasonic cleaning device 2, and is cleaned by ultrasonic waves.

[0061] The core shaft formed with the PI tube layer after ultrasonic cleaning is a PI conduit semi-finished product, which is rolled up by the rolling mechanism 6; during the rolling up, the wire diameter testing device 63 tests the diameter of the PI tube layer.

[0062] The core shaft is pulled out by the core pulling device (the two ends of the PI catheter semi-finished product are clamped, and the electric cylinder pulls the core shaft to pull it out) to obtain a medical PI catheter. When pulling out the core, the PI catheter semi-finished product can be cut into shorter lengths before the core shaft is pulled out.

[0063] It should also be noted that the core shaft 8 in the present invention is generally made of stainless steel wire.

[0064] During production, the aperture of the mold hole of the uniform coating mold 34 can be designed according to requirements, so as to obtain medical PI catheters of various required sizes, precise and uniform wall thickness, and high strength. The device of the present invention can produce PI catheters with micron-level wall thickness.

[0065] The utility model innovatively designs a medical PI catheter vertical coating production equipment and method, which produces PI catheters by combining vertical coating and curing molding. Compared with existing extrusion molding equipment and processes, the catheter diameter can be accurately controlled, the uniformity of the catheter wall thickness can be improved, and the concentricity of the catheter can be improved, thereby improving product quality.

[0066] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A medical PI catheter vertical coating production equipment, characterized in that: include: The mandrel unwinding and tensioning mechanism is used to unwind the mandrel and tension the mandrel in motion; A uniform coating device, which is a vertical structure, is used to uniformly coat the mandrel with PI emulsion and control the outer diameter after coating. The uniform coating device comprises a uniform coating die with a die hole. The PI emulsion is loaded onto the mandrel part below the uniform coating die. The mandrel moves upward in a vertical direction through the die hole of the uniform coating die. A vertical curing device is used to perform high-temperature curing and molding of the PI emulsion coated on the mandrel; The winding mechanism is used for winding the core shaft formed with the PI tube layer.

2. A medical PI catheter vertical coating production equipment according to claim 1, characterized in that: The mandrel unwinding and tensioning mechanism comprises a winding disk and a material unwinding and tensioning assembly, the mandrel is wound on the winding disk, and the material unwinding and tensioning assembly tensions the mandrel unwinded from the winding disk.

3. A medical PI catheter vertical coating production equipment according to claim 2, characterized in that: The material unwinding and tensioning assembly comprises a plurality of material unwinding and tensioning wheels. The material winding disc is driven by a motor to rotate, and the mandrel unwinding from the material winding disc sequentially passes around the plurality of material unwinding and tensioning wheels for tensioning.

4. The medical PI catheter vertical coating production equipment according to claim 1 is characterized in that: The device also includes a guide wheel group, and the core shaft can move in a vertical direction under the guidance of the guide wheel group.

5. The medical PI catheter vertical coating production equipment according to claim 1 is characterized in that: It also includes an ultrasonic cleaning device and a catalytic treatment device; the ultrasonic cleaning device is used to ultrasonically clean the mandrel before coating or the mandrel formed with a PI tube layer, and the catalytic treatment device is used to catalytically treat the waste gas generated during the high-temperature curing process.

6. The medical PI catheter vertical coating production equipment according to claim 1 is characterized in that: The uniform coating device also includes a guide plate and a comb plate, the guide plate is provided with a guide groove, the comb plate is provided with a comb groove, the uniform coating mold is arranged between the guide plate and the comb plate, and the core shaft moving in the vertical direction passes through the guide groove of the guide plate, the mold hole of the uniform coating mold, and the comb groove of the comb plate in sequence.

7. A medical PI catheter vertical coating production equipment according to claim 1 or 6, characterized in that: The uniform coating mold is a movable part. After the PI emulsion is loaded onto the mandrel, the uniform coating mold can move to a certain position along with the mandrel.

8. A medical PI catheter vertical coating production equipment according to claim 1 or 6, characterized in that: There are multiple uniform coating dies, which are arranged in a horizontal direction in sequence, and the apertures of the dies are increased in sequence; the core shaft coated with PI emulsion passes through the next adjacent uniform coating die after passing through the vertical curing device, and undergoes another PI emulsion coating diameter control treatment.

9. The medical PI catheter vertical coating production equipment according to claim 1, characterized in that: The winding mechanism comprises a winding tension wheel and a winding disk, and the core shaft formed with the PI tube layer is wound by the winding mechanism.

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