CN114770034A - Cutting method and device for stent tube - Google Patents
Cutting method and device for stent tube Download PDFInfo
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- CN114770034A CN114770034A CN202210277890.5A CN202210277890A CN114770034A CN 114770034 A CN114770034 A CN 114770034A CN 202210277890 A CN202210277890 A CN 202210277890A CN 114770034 A CN114770034 A CN 114770034A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000003698 laser cutting Methods 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 229910000831 Steel Inorganic materials 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 241001424392 Lucia limbaria Species 0.000 description 2
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical class [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910001000 nickel titanium Inorganic materials 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 210000003709 heart valve Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The application provides a cutting method and a device of a stent tube, wherein the cutting method comprises the following steps: respectively sleeving a first pipe and a second pipe at two ends of the connecting piece; pressurizing the connecting piece to enable the connecting piece to form a combined structure in interference fit with the first pipe and the second pipe; and fixing the combined structure, and cutting the first pipe and/or the second pipe in the combined structure. According to the cutting method and device for the stent tube, the first tube and the second tube are uniformly connected through the pressure expansion method of the connecting piece, the utilization rate of the stent tube can be effectively improved, and the production cost is saved.
Description
Technical Field
The application belongs to the technical field of medical instruments, and particularly relates to a cutting method and device for a stent tube.
Background
The existing laser cutting machine for cutting the bracket basically clamps the pipe firstly, the extending part extends to the laser cutting head, a certain distance (generally about 120 mm) exists between the two parts, and the distance leads the pipe (namely, the tailing pipe) to be unusable. Tubing for high-end medical device products tends to be very costly, such as tubing for heart valve stents, and waste of tailings increases production costs. In addition, the deformation and the poor coaxiality of the pipe can be caused by conventional welding butt joint or adhesive butt joint, the mechanical property of the pipe is influenced by heating and removing the adhesive, and the like, so that the cut bracket is not tight to cut, uneven in waveform, not up to the standard in mechanical property and the like, and the bracket under the conditions belongs to unqualified products and cannot be used for clinic.
Disclosure of Invention
In order to solve the technical problems, the application provides a method and a device for cutting a stent tube, wherein a first tube and a second tube are uniformly connected by a method of pressure expansion of a connecting piece, so that the utilization rate of the stent tube can be effectively improved, and the production cost is saved.
The application provides a cutting method of a stent tube, which comprises the following steps:
respectively sleeving a first pipe and a second pipe at two ends of the connecting piece;
pressurizing the connecting piece to enable the connecting piece to form a combined structure in interference fit with the first pipe and the second pipe;
fixing the combined structure, and cutting the first pipe and/or the second pipe in the combined structure.
Optionally, the first tubing, the second tubing and the connector are located on the same axis.
Optionally, the two ends of the connecting piece are respectively sleeved with the first pipe and the second pipe, including:
determining a centerline of the connection;
and respectively enabling one end of the first pipe and one end of the second pipe to penetrate through two ends of the connecting piece and be attached and aligned along the midline.
Optionally, said pressurizing said connection, comprising:
pressurizing the connection by at least one of pneumatic pressurization, hydraulic pressurization, and extrusion.
Optionally, said pressurizing said connection, further comprising:
and connecting the connecting piece and a pressurizing device through a quick-change connector, wherein the pressurizing device is used for pressurizing the connecting piece.
Optionally, the method further includes:
and when the length of the first pipe and/or the second pipe is less than or equal to a preset value, the pressure is relieved for the connecting piece.
Optionally, the fixing the combined structure and cutting the first tube and/or the second tube in the combined structure includes:
and fixing the combined structure on a clamp of a laser cutting machine, and cutting the first pipe and/or the second pipe through a laser cutter head.
The application also provides a cutting device of the stent tube, which applies the cutting method of the stent tube, and the cutting device comprises a connecting piece, a first tube, a second tube and a cutting device;
the connecting piece is of a cylindrical hollow structure;
the inner diameter of the first tubular is greater than the outer diameter of the connector, and the inner diameter of the second tubular is greater than the outer diameter of the connector;
the cutting device comprises a fixing part and a cutting part.
Optionally, the hardness of the connector is less than or equal to the hardness of the first tubing and the hardness of the connector is less than or equal to the hardness of the second tubing.
Optionally, the inner diameter of the first tubular and the inner diameter of the second tubular are equal.
The application provides a cutting method and a device of a stent tube, wherein the cutting method comprises the following steps: respectively sleeving a first pipe and a second pipe at two ends of the connecting piece; pressurizing the connecting piece to enable the connecting piece to form a combined structure in interference fit with the first pipe and the second pipe; and fixing the combined structure, and cutting the first pipe and/or the second pipe in the combined structure. According to the cutting method and device for the stent tube, the first tube and the second tube are uniformly connected through the pressure expansion method of the connecting piece, the utilization rate of the stent tube can be effectively improved, and the production cost is saved.
Drawings
Fig. 1 is a schematic flow chart of a cutting method of a stent tube provided in an embodiment of the present application;
FIG. 2 is a schematic process diagram of a cutting method for stent tubing provided in an embodiment of the present application;
fig. 3 is a second process schematic diagram of a cutting method of a stent tube according to an embodiment of the present application;
fig. 4 is a third process schematic diagram of a cutting method of a stent tube provided in an embodiment of the present application.
Detailed Description
The technical solution of the present application is further described in detail with reference to the drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, "and/or" includes any and all combinations of one or more of the associated listed items.
First embodiment
Fig. 1 is a schematic flow chart of a cutting method of a stent tube provided in an embodiment of the present application. Referring to fig. 1, the present embodiment provides a method for cutting a stent tube, including the following steps:
step 201: and respectively sleeving the first pipe and the second pipe at two ends of the connecting piece.
Referring to fig. 2, a first pipe is taken as a tailing pipe 1, and a second pipe is taken as a new pipe 3. Firstly, a connecting piece 2 with the length of about 20mm is manufactured, the outer circle of the connecting piece 2 is matched with the male difference half according to corresponding grades to form clearance assembly with a tailing pipe 1 and a new pipe 3, and the end head of the tailing pipe 1 is aligned with the end head of the new pipe 3. Wherein, the internal diameter of the tailing pipe 1 is larger than the external diameter of the connecting piece 2, and the internal diameter of the new pipe 3 is larger than the external diameter of the connecting piece 2. Optionally, the difference between the outer diameter of the coupling 2 and the inner diameters of the tailing pipe 1 and the new pipe 3 is between 0.05mm and 0.10 mm. The connecting piece 2 is coaxially matched and connected with the tailing pipe 1 and the new pipe 3, so that the tailing pipe 1, the new pipe 3 and the connecting piece 2 are positioned on the same axis.
Optionally, the inner diameter of the tail pipe 1 is equal to the inner diameter of the new pipe 3, so that the tail pipe 1 and the new pipe 3 can be synchronously and uniformly deformed along with the expansion of the connecting piece 2.
Optionally, the both ends of connecting piece are located with first tubular product and second tubular product cover respectively, include:
determining a midline of the connection;
and respectively enabling one end of the first pipe and one end of the second pipe to penetrate through two ends of the connecting piece and be in fit alignment along the center line.
Specifically, the middle point of the connecting piece 2 in the length direction can be marked, half of the connecting piece 2 is penetrated into the tailing pipe 1, and the other half of the connecting piece 2 is penetrated into the new pipe 3, so that the tailing pipe 1 and the second pipe 2 respectively occupy half of the length of the connecting piece 2.
Step 202: and pressurizing the connecting piece to enable the connecting piece to form a combined structure in interference fit with the first pipe and the second pipe.
Referring to fig. 3, the outer wall of the connecting member expands outward after being pressed, and is tightly attached to the tail pipe 1 and the new pipe 3. The connecting piece 2 is uniformly expanded in a quantitative pressurizing mode, so that interference fit of a certain degree is formed among the tailing pipe 1, the new pipe 3 and the connecting piece 2. Meanwhile, the connecting piece 2 has good torsion resistance, so that not only can the coaxial and positioning butt joint between the tailing pipe and the new pipe be realized, but also the requirement on enough torque during pipe cutting can be ensured, and the cutting-proof or uneven waveform can be prevented from being generated during the subsequent bracket cutting. The cutting method of the embodiment does not use chemical adhesion so as to prevent the chemical adhesion from influencing the surface quality of the stent tube, the subsequent removal is difficult, and the unclean cleaning can cause the stent to have chemical poison and bring hidden danger to the subsequent implanted valve products.
Specifically, the connecting member 2 can be pressurized by at least one of pneumatic pressurization, hydraulic pressurization and extrusion, so that the connecting member 2 is uniformly expanded, and the stability of the physicochemical properties of the stent tube is maintained. Wherein, the connecting piece 2 is in a cylindrical hollow structure. One end of the connecting piece 2 can be provided with an opening, the small hole of the connecting piece 2 is communicated with the quick-change connector 4 through a small pipe or a seamless steel pipe, and the connecting piece can be connected in a threaded or welding mode and ensures good sealing. When the connecting piece 2 is only provided with a hole at one end thereof, the hole end of the connecting piece 2 can be the end of the tailing pipe 1 or the end of the new pipe 3. Under the condition that the new pipe is long, one end of the tailing pipe can be selectively connected with the quick-change connector 4, so that the quick-change connector 4 is exposed out of one end of the tailing pipe, and the subsequent pressurization or pressure relief operation is facilitated. If the space of the cutting device is insufficient, the quick-change connector 4 can be connected to one end of a new pipe material for pressurization and pressure relief. Then, a pressurizing device is connected through the quick-change connector, and gas or injected liquid is introduced into the connecting piece 2 to pressurize and expand the connecting piece. Of course, both ends of the connecting member 2 may be directly pressed to be deformed and expanded.
Step 203: and fixing the combined structure, and cutting the first pipe and/or the second pipe in the combined structure.
Referring to fig. 3, the combined structure of the tailing pipe 1, the connecting member 2 and the new pipe 3 is fixed on a clamp 5 of a laser cutting machine, and the tailing pipe 1 and/or the new pipe 3 is cut by a laser cutter head 6. Specifically, the connected combined structure is clamped on a clamp platform of a laser cutting machine, normal cutting operation is carried out, when the length of the connecting piece 2 is 20mm, the tailing pipe (the first pipe 3) is connected with the connecting piece 2 only by about 10mm, the final residual length of the tailing pipe is reduced to the maximum extent, and the utilization rate of the tailing pipe is greatly improved.
Optionally, the cutting method further comprises:
when the length of the first pipe and/or the second pipe is smaller than or equal to a preset value, the pressure is relieved for the connecting piece, so that the connecting piece, the first pipe and the second pipe are separated.
In this embodiment, the length of the tail pipe 1 and/or the new pipe 3 is less than or equal to the preset value, the preset value can be set to the length of a finished stent, when the remaining length of the stent pipe is not enough to cut out a complete stent, the connecting piece 2 can recover the original shape through pressure relief, and the tail pipe 1, the new pipe 3 and the connecting piece 2 are separated. This process need not to heat or contract with cold to support tubular product, has avoided probably leading to the change of support tubular product own mechanical properties because of heating or contract with cold, and then influences the final quality of support. It should be noted that the pressure relief mode should correspond to the pressurization mode in step 202. For example, when the pressurization mode is pneumatic or hydraulic pressurization, the small hole of the connecting piece 2 and the quick-change connector 4 can be communicated through a small tube or a seamless steel tube, and then a pressure relief device is connected through the quick-change connector, so that gas or liquid used for pressurization in the connecting piece 2 is discharged, and the connecting piece 2 is restored to the original shape. It should be understood that, in this embodiment, a pressure boosting and pressure relieving integrated device may be adopted to reduce the hardware devices involved in the treatment process. Accordingly, if the connection member 2 is pressurized by the compression deformation, the compression force applied to the connection member 2 is removed.
Optionally, the connector has a hardness less than or equal to the hardness of the first tubing and the connector has a hardness less than or equal to the hardness of the second tubing.
In this embodiment, the hardness of the connecting member 2 is lower than that of the stent tube, and the difference is preferably greater than HB50, so as to prevent the surface of the inner hole of the stent tube from being damaged.
It should be illustrated that, the tailing pipe 1, the connecting member 2 and the new pipe 3 are injected with gas or liquid through the quick-change connector 4, so that the connecting member 2 is uniformly expanded, and the three are connected into a whole in an interference fit manner, and then the combined body is clamped on a clamp 5 of a laser cutting machine, and normal production cutting is performed through a laser cutter head 6. The method comprises the following specific operation steps:
1. the initial outer diameter of the manufactured connecting piece 2 is smaller than the inner diameter of the bracket tube (determined according to different types of tubes), the length is about 20mm, and the middle position of the connecting piece 2 is marked by a line to ensure that the assembly lengths at two ends are equal; one end of the connecting piece 2 is connected with the quick-change connector 4 through a small pipe, so that the quick-change connector 4 is ensured to be exposed at the other end of the tailing pipe 1 after assembly, and subsequent pressurization or pressure relief operation and the like are facilitated.
2. The tailing pipe 1, the connecting piece 2 and the new pipe 3 are preassembled according to the position of figure 2, the quick-change connector 4 is used for receiving gas or liquid and controlling a certain pressure value, and the expansion state of the connecting piece is formed into a combined structure shown in figure 3 after being pressed and expanded.
3. And clamping the combined body on a clamp 5 of a laser cutting machine, and carrying out normal production cutting through a laser cutter head 6. Because there is the central line mark point to expose in the middle of connecting piece 2, the naked eye is visible, not only can avoid laser tool bit 6 to cut the position at connecting piece 2, still can judge whether need change the tails tubular product 1 of connecting piece 2 one end according to the surplus length and the support demand length of tails tubular product 1 when the cutting. And finally, when the residual length of the tailing pipe 1 is not enough to cut a complete stent, the pressure is relieved through the quick-change connector 4, so that the connecting piece 2 retracts to the original shape, and the tailing pipe 1 is removed.
The invention realizes the reasonable butt joint of the tailing pipe and the new pipe, has high coaxiality and good torsion resistance, does not influence various performances of the pipes, can repeatedly utilize the connecting piece, and has less steps and easy operation. The elastic uniform expansion after pressurization can be realized, and the original shape can be recovered after pressure relief.
The invention greatly improves the utilization rate of raw materials and saves the production cost. The length of each tube commonly used for cutting the stent is controlled below 1000mm, the residual length of each tailing tube after normal cutting is generally about 120mm, and by adopting the process measure of the invention, the length of the tailing tube can be reduced to about 20mm, and the tube utilization rate can be improved by more than 10%.
The cutting method and device for the stent tube provided by the embodiment of the application comprise the following steps: respectively sleeving a first pipe and a second pipe at two ends of the connecting piece; pressurizing the connecting piece to enable the connecting piece to form a combined structure in interference fit with the first pipe and the second pipe; and fixing the combined structure, and cutting the first pipe and/or the second pipe in the combined structure. According to the cutting method and device for the stent tube, the first tube and the second tube are uniformly connected through the pressure expansion method of the connecting piece, the utilization rate of the stent tube can be effectively improved, and the production cost is saved.
Second embodiment
In the embodiment, the specifications of the nickel-titanium alloy tailing pipe and the new pipe are both 8mm in outer diameter and 0.5mm in wall thickness. The method comprises the following specific operation steps:
1. the copper alloy connecting piece 2 with the outer diameter of 6.90-6.95mm is manufactured, the connecting piece and the quick-change connector are connected into a whole through a small copper pipe or a seamless steel pipe, the connecting piece and the quick-change connector can be connected in a threaded or welding mode, and good sealing is guaranteed.
2. Pre-assembling a nickel-titanium alloy tailing pipe, a connecting piece and a new pipe;
3. the connecting piece is ventilated and pressurized by 0.06MPa through the quick-change connector, the interference fit of the quick-change connector, the quick-change connector and the connecting piece is checked, and the outer diameter of the pipe can be measured through a vernier caliper or a slight torsion test is carried out to verify the interference condition.
4. And the combined body of the three parts is clamped on a clamp of a laser cutting machine, and normal production cutting is carried out through a laser cutter head. And finally, when the residual length of the tailing pipe is less than 20mm, the pressure is relieved through the quick-change connector, so that the connecting piece retracts to the original shape, and the tailing pipe is removed.
Third embodiment
In the embodiment, the specifications of the cobalt-chromium alloy tailing pipe and the new pipe are both 29mm in outer diameter and 0.6mm in wall thickness. The method comprises the following specific operation steps:
1. the nylon connecting piece with the outer diameter ranging from 27.70 mm to 27.75mm is manufactured, the connecting piece and the quick-change connector are connected into a whole through a small copper pipe or a seamless steel pipe and can be connected in a threaded or buckled mode, and good sealing is guaranteed.
2. Pre-assembling a cobalt-chromium alloy tailing pipe, a connecting piece and a new pipe;
3. the connecting piece is ventilated and pressurized by 0.1MPa through the quick-change connector, whether the connecting piece, the quick-change connector and the connecting piece are in interference fit is checked, and the outer diameter of the pipe can be measured through a vernier caliper or a slight torsion test is carried out to verify the interference condition.
4. The combined body of the three parts is clamped on a clamp of a laser cutting machine, and normal production cutting is carried out through a laser cutter head. And finally, when the residual length of the tailing pipe is less than 20mm, the pressure is relieved through the quick-change connector, so that the connecting piece retracts to the original shape, and the tailing pipe is removed.
Fourth embodiment
The embodiment provides a cutting device for a stent tube, and the cutting method for the stent tube in any embodiment is applied.
The cutting device of the stent tube comprises a connecting piece, a first tube, a second tube and a cutting device;
the connecting piece is of a cylindrical hollow structure, and at least one end of the connecting piece is provided with an opening;
the inner diameter of the first pipe is larger than the outer diameter of the connecting piece, and the inner diameter of the second pipe is larger than the outer diameter of the connecting piece;
the cutting device comprises a fixing part and a cutting part.
Optionally, the hardness of the connector is less than or equal to the hardness of the first tubing and the hardness of the connector is less than or equal to the hardness of the second tubing.
Optionally, the inner diameter of the first tubing and the inner diameter of the second tubing are equal.
For a specific application method of the cutting device for stent tubes in this embodiment, please refer to the first to fourth embodiments, which are not described herein again.
The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present disclosure be covered by the claims of the present application.
Claims (10)
1. A method of cutting a stent tube, comprising:
respectively sleeving a first pipe and a second pipe at two ends of the connecting piece;
pressurizing the connecting piece to enable the connecting piece to form a combined structure in interference fit with the first pipe and the second pipe;
fixing the combined structure, and cutting the first pipe and/or the second pipe in the combined structure.
2. The cutting method of claim 1, wherein the first tube, the second tube, and the connector are located on the same axis.
3. The cutting method according to claim 1, wherein the step of respectively sleeving the first tube and the second tube on both ends of the connecting member comprises:
determining a midline of the connection;
and respectively enabling one end of the first pipe and one end of the second pipe to penetrate through two ends of the connecting piece and be attached and aligned along the midline.
4. The cutting method of claim 1, wherein said pressurizing said coupling comprises:
pressurizing the connection by at least one of pneumatic pressurization, hydraulic pressurization, and extrusion.
5. The cutting method of claim 4, wherein said pressurizing said coupling, further comprises:
and the connecting piece and the pressurizing device are connected through a quick-change connector, and the pressurizing device is used for pressurizing the connecting piece.
6. The cutting method of claim 1, further comprising:
and when the length of the first pipe and/or the second pipe is less than or equal to a preset value, the pressure is relieved for the connecting piece.
7. The cutting method of claim 1, wherein said securing said composite structure and cutting said first tube and/or said second tube in said composite structure comprises:
and fixing the combined structure on a clamp of a laser cutting machine, and cutting the first pipe and/or the second pipe through a laser cutter head.
8. A stent tube cutting device, characterized in that the stent tube cutting method according to any one of claims 1 to 7 is applied, the cutting device comprises a connecting member, a first tube, a second tube and a cutting device;
the connecting piece is of a cylindrical hollow structure;
the inner diameter of the first tubular is greater than the outer diameter of the connector, and the inner diameter of the second tubular is greater than the outer diameter of the connector;
the cutting device comprises a fixing part and a cutting part.
9. The cutting device of claim 8, wherein the connector has a hardness less than or equal to a hardness of the first tubing and the connector has a hardness less than or equal to a hardness of the second tubing.
10. The cutting device of claim 8, wherein the inner diameter of the first tube and the inner diameter of the second tube are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277890.5A CN114770034A (en) | 2022-03-21 | 2022-03-21 | Cutting method and device for stent tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277890.5A CN114770034A (en) | 2022-03-21 | 2022-03-21 | Cutting method and device for stent tube |
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|---|---|
| CN114770034A true CN114770034A (en) | 2022-07-22 |
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| CN202210277890.5A Pending CN114770034A (en) | 2022-03-21 | 2022-03-21 | Cutting method and device for stent tube |
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| CN212509925U (en) * | 2020-11-20 | 2021-02-09 | 史娟珠 | Pipeline connecting piece |
| CN213632949U (en) * | 2020-12-09 | 2021-07-06 | 湖北大洋塑胶有限公司 | High-pressure inflation clamp for plastic pipeline |
| CN214007693U (en) * | 2020-12-15 | 2021-08-20 | 张方明 | Pipe fitting butt joint quick connector |
| CN113601212A (en) * | 2021-08-09 | 2021-11-05 | 扎赉诺尔煤业有限责任公司 | Cutting machine |
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