CN218638776U - Prevent striking sparks, prevent non-high frequency plasma cutting rifle head that falls - Google Patents
Prevent striking sparks, prevent non-high frequency plasma cutting rifle head that falls Download PDFInfo
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- CN218638776U CN218638776U CN202221471538.7U CN202221471538U CN218638776U CN 218638776 U CN218638776 U CN 218638776U CN 202221471538 U CN202221471538 U CN 202221471538U CN 218638776 U CN218638776 U CN 218638776U
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Abstract
The utility model provides a non-high frequency plasma cutting gun head which can prevent sparking and falling, wherein the non-high frequency plasma cutting gun head is formed by assembling a piston rod component, a spring, an insulating component, a supporting seat component and a top cover; piston rod subassembly connecting circuit's negative pole, supporting seat subassembly connecting circuit is anodal, and insulating subassembly plays insulating effect between piston rod subassembly and supporting seat subassembly, isolated circuit positive negative pole, and top cap connection support seat subassembly and insulating subassembly make both fixed, and the spring is in between piston rod subassembly and the insulating subassembly and compressed by both for axial compression, rebound motion can be realized to the piston rod subassembly. The purpose of the design is to make the assembly of the whole gun head simpler; the anode and the cathode of the circuit are well isolated by the insulating assembly, the creepage distance is longer, and short circuit ignition can be better prevented; another purpose is that the design of cladding layer upon layer makes whole rifle head more firm like this, has better anti falling, anti ability of knocking.
Description
Technical Field
The utility model relates to an ion cutting technical field more particularly, relates to a prevent striking sparks, prevent non-high frequency plasma cutting rifle head that falls.
Background
Material handling devices such as plasma cutting, flame cutting and lasers are widely used for cutting and marking workpieces. Plasma cutting generally comprises a cutting torch head body, an electrode mounted within the body, a nozzle having a central bore, an outer nozzle holding the nozzle, a protective cap protecting the nozzle, electrical connections, channels for cooling and arc control fluids, a flow divider controlling the fluid flow pattern, and a power supply. The gas used for cutting may be an inert or reactive gas. The plasma arc produced by cutting is a high temperature and high momentum ionized jet of constricted plasma gas.
Compared with the traditional flame cutting, the plasma cutting speed is higher, the efficiency is higher and the quality is better under the condition that the thickness is less than 25 mm. Compared with laser cutting, the laser cutting method has obvious advantages in cutting cost, almost 1/3 of the laser cutting cost, and the laser is only suitable for cutting thin plates and has a narrow application range. In addition, the numerical control plasma cutting and automatic nesting programming software are matched, so that the material utilization rate can be improved by 5-10%, and the steel can be saved by 100-200 million tons every year in terms of cutting 2000 million tons every year, and the value is billion yuan. Therefore, in industrially developed countries, a trend of replacing the flame cutter and the laser cutter with the numerical control plasma cutter has been developed. Therefore, the research and the popularization of the plasma cutting technology have important significance and profound development prospect.
Plasma cutting that uses usually among the prior art, rifle head body structure is complicated, and interior copper spare in addition outside piston rod, insulating part, supporting seat, interior copper spare intercommunication piston rod negative pole, supporting seat intercommunication positive pole, structure about being between interior copper spare and the supporting seat, creepage distance is short, and the connection between insulating part and the interior copper spare is fixed through the pin moreover, causes the damage when using improperly easily.
Disclosure of Invention
Problem to prior art existence, the utility model provides a prevent striking sparks, prevent non-high frequency plasma cutting rifle head that falls, the rifle head adopts layer upon layer cladding formula structure, and the insulating part is completely isolated with power positive pole and negative pole and is opened, safe and reliable more, and on the other hand supporting seat is the insulating part and the piston rod of cladding completely, makes whole rifle head more shock-resistant.
The technical scheme of the utility model is that: a non-high-frequency plasma cutting gun head capable of preventing sparking and impact comprises a piston rod assembly, a spring, an insulation assembly, a supporting seat assembly and a top cover;
the piston rod assembly comprises a piston rod, a first sealing ring, an anti-rotation pin, a limiting block, a cable, a crimping terminal and a connecting screw; the insulation assembly comprises an insulation piece, a second sealing ring and a third sealing ring; the supporting seat assembly comprises a supporting seat, a fourth sealing ring, a copper air pipe and a heat-shrinkable pipe;
the head of the near end of the piston rod is provided with an axial hole, the outer surface of the near end of the piston rod is provided with a boss and a first restraining spring step, and the far end of the piston rod is provided with an anti-rotation pin hole, a connecting threaded hole and a clamping groove; the axial hole can accommodate a plasma electrode, the boss is provided with an annular groove capable of accommodating a first sealing ring, the first restraint spring step is a limiting step surface limiting the near end of the spring, the anti-rotation pin hole can accommodate an anti-rotation pin to limit the rotation of the piston rod, the connection threaded hole is connected with the cable and the crimping terminal through the connection screw, and the clamping groove is connected with the limiting block to limit the descending position of the piston rod;
the second sealing ring and the third sealing ring are sleeved on the excircle of the insulating part from top to bottom, the insulating assembly accommodates the piston rod, an insulating assembly limiting step and a second restraining spring step are arranged in the insulating assembly, an insulating assembly positioning step is arranged outside the insulating assembly, the insulating assembly limiting step limits the rising position of the piston rod, the second restraining spring step is a limiting step surface limiting the far end of the spring, and the insulating assembly positioning step is matched with the supporting seat to be used as the near-end face for fixing the insulating assembly;
the supporting seat can accommodate the insulating component, and a first air chamber and a second air chamber are formed between the supporting seat and the insulating component; the support seat assembly comprises a first air chamber, a second air chamber, a top cover, an insulator assembly, a support seat, a piston rod assembly and a piston rod, wherein a plurality of support seat axial small holes are distributed between the first air chamber and the second air chamber and communicated with the two air chambers, a step capable of limiting the insulator assembly is arranged at the near end of the support seat, the top cover is in threaded connection with the far end of the insulator assembly and is fixed by the support seat, the top cover, the insulator assembly and the support seat are completely fixed, a thread capable of being connected with an external nozzle and a fourth sealing ring at a fixed position are arranged on the excircle of the near end of the support seat, the support seat is connected with the copper rod and is an inlet of plasma gas, a copper pipe inner hole is formed in the copper pipe, the support seat assembly wraps the insulator assembly, the piston rod assembly wraps the piston rod assembly, the piston rod assembly can axially move up and down in the inner hole of the insulator assembly and can be limited by a limit block when the piston rod boss at the near end of the piston rod when the piston rod descends, and accordingly the piston rod axially moves up and down at the fixed position.
Further, the plasma electrode with the piston rod is connected fixedly, the shunt with the laminating of insulating subassembly near-end, the nozzle with the shunt laminating, outer nozzle with supporting seat near-end threaded connection and will the nozzle with the shunt is fixed, there are a plurality of radial apertures of shunt on the shunt, there are a plurality of outer nozzle circumference apertures on the outer nozzle, there is a nozzle aperture on the nozzle, the nozzle the shunt with form the third air chamber between the electrode.
Furthermore, the piston rod axial aperture of the piston rod is a taper hole, and is in conical surface fit with the plasma electrode, the piston rod does not rotate with the plasma electrode matched with the piston rod, the rotation preventing pin is cancelled at the moment, meanwhile, a piston rod vent hole is additionally formed in the piston rod, and the piston rod is fixedly connected with the cable conductor through a piston rod cable connecting hole.
Furthermore, the piston rod axial aperture of the piston rod is a step straight hole, a crown spring is accommodated in the step straight hole to be matched with the plasma electrode, the piston rod does not need to rotate with the matched plasma electrode, the rotation prevention pin is cancelled at the moment, meanwhile, a piston rod vent hole is additionally arranged in the piston rod, and the piston rod is fixedly connected with the cable through a piston rod cable connecting hole.
Further, the piston rod is assembled by a piston rod center piece and a piston ring, and an annular groove capable of accommodating the first sealing ring is formed in the piston ring.
Furthermore, the connection between the piston ring and the piston rod center piece is threaded connection, or interference compression connection, or clearance fit, and a piston rod sealing ring is added between the piston ring and the piston rod center piece. Play a role in sealing and fixing.
Furthermore, the insulating part is an integral pipe fitting made of high-temperature-resistant insulating materials, or is formed by connecting a plurality of pipe fittings made of high-temperature-resistant insulating materials in a threaded manner up and down.
Furthermore, a layer of heat-shrinkable tube is arranged outside the copper air tube. Plays an insulating role.
Furthermore, the clamping groove and the limiting block are matched by crimping, clamping, threaded connection, riveting or welding.
Furthermore, the copper air pipe and the supporting seat are fixedly connected through threads, welded or in interference crimping.
The utility model has the advantages that: the non-high-frequency plasma cutting gun head is formed by assembling a piston rod assembly, a spring, an insulation assembly, a supporting seat assembly and a top cover; the negative pole of piston rod subassembly connecting circuit, supporting seat subassembly connecting circuit is anodal, adopts layer upon layer cladding formula structure, insulating assembly is in the piston rod subassembly with between the supporting seat subassembly, play insulating effect, completely isolated positive negative pole circuit strengthens the insulating properties between supporting seat and the piston rod, the top cap is connected the supporting seat subassembly with insulating assembly makes both fixed, the spring is in the piston rod subassembly with by both compression between the insulating assembly, make the piston rod subassembly can realize axial compression, rebound motion. The purpose of the design is to make the assembly of the whole gun head simpler; the anode and the cathode of the circuit are well isolated by the insulating assembly, the creepage distance is longer, and short circuit ignition can be better prevented; another purpose is that the design of cladding layer upon layer makes whole rifle head more firm like this, has better anti falling, anti ability of knocking. Another object is that such a design uses less material and is simpler to assemble.
Drawings
Fig. 1 is a cross-sectional view of a plasma cutting torch head according to the present invention.
Fig. 2 is a cross-sectional view of a plasma cutting torch head and wearing parts of the present invention.
Fig. 3 is a schematic gas flow diagram using the novel plasma cutting torch head of the present invention.
Fig. 4 is a schematic view of a piston rod using the second embodiment of the present invention.
Fig. 5 is a schematic view of a piston rod using the third embodiment of the present invention.
Fig. 6 is a schematic view of a piston rod according to a fourth embodiment of the present invention.
Figure 7 shows a schematic view of the insulating assembly assembled from separate parts.
Figure 8 shows the insulating assembly as a whole.
FIG. 9 shows one example of the distal end of the piston rod assembly in the second embodiment.
Fig. 10 shows another schematic view of the distal end of the piston rod assembly.
Wherein:
1-piston rod 2-first insulator 3-spring
4-support seat 5-second insulating part 6-first sealing ring
7-fourth sealing ring 8-second sealing ring 9-third sealing ring
10-top cover 11-anti-rotation pin 12-limiting block
13-crimping terminal 14-connecting screw 15-cable
16-copper air pipe 17-heat shrinkable tube 18-nozzle
19-electrode 20-splitter 21-outer nozzle
22-piston rod axial small hole 23-piston rod boss 24-insulation component limiting step
25-insulating assembly positioning step 26-first restraining spring step 27-second restraining spring step
28-support seat positioning step 29-insulation assembly distal end thread 30-copper air pipe inner hole
31-first air chamber 32-support seat axial small hole 33-second air chamber
34-splitter radial orifice 35-outer nozzle circumferential orifice 36-third air chamber
37-nozzle small hole 221-piston rod exhaust hole 222-piston rod connecting cable hole
223-crown spring 224-piston rod seal ring 225-piston ring
226-piston rod center piece
Detailed Description
Example one
The plasma cutting torch head of the present invention will be described in further detail with reference to the accompanying drawings.
The utility model discloses plasma cutting rifle head is a safe and reliable's protecting against shock plasma cutting rifle head, and insulating properties is more excellent.
As shown in fig. 1, 2 and 3, the non-high frequency plasma cutting gun head for preventing sparking and impact comprises a piston rod assembly, a spring 3, an insulating assembly, a supporting seat assembly and a top cover 10.
The piston rod assembly comprises a piston rod 1, a first sealing ring 6, an anti-rotation pin 11, a limiting block 12, a cable 15, a crimping terminal 13 and a connecting screw 14. The insulating assembly comprises an insulating member, a second sealing ring 8 and a third sealing ring 9, wherein the insulating member can be formed by connecting the first insulating member 2 and the second insulating member 5 in a threaded manner as shown in fig. 7, or can be an integral body as shown in fig. 8. The supporting seat component comprises a supporting seat 4, a fourth sealing ring 7, a copper air pipe 16 and a heat shrinkable pipe 17.
The head of the near end of the piston rod 1 is provided with a piston rod axial small hole 22, the outer surface of the near end of the piston rod 1 is provided with a boss 23 and a first restraint spring step 26, and the far end of the piston rod 1 is provided with an anti-rotation pin hole, a connection threaded hole and a clamping groove. The piston rod axial small hole 22 can accommodate a plasma electrode 19, the boss 23 is provided with an annular groove capable of accommodating a first sealing ring 6, the first restraint spring step 26 is a limiting step surface for limiting the near end of the spring 3, the anti-rotation pin hole can accommodate an anti-rotation pin 11 for limiting the rotation of the piston rod, a connection threaded hole is connected with the cable 15 and the crimping terminal 13 through the connection screw 14, the connection mode can be as shown in figures 1 and 10, and the clamping groove is connected with the limiting block for limiting the descending position of the piston rod 1.
The cover has on the insulating part excircle second sealing washer 8 with third sealing washer 9, insulating assembly holds piston rod 1, and insulating assembly is inside to have an insulating assembly spacing step 24 and a second restraint spring step 27, and insulating assembly outside has an insulating assembly location step 25, insulating assembly spacing step 24 restriction the rising position of piston rod 1, second restraint spring step 27 is the restriction a spacing step face of spring 3 distal end, insulating assembly location step 25 with the supporting seat cooperation is with this as fixing insulating assembly's near-end terminal surface.
The support base 4 can accommodate the insulating component, and a first air chamber 31 and a second air chamber 33 are formed between the support base and the insulating component. A plurality of support seat axial small holes 32 are distributed between the first air chamber 31 and the second air chamber 33, the support seat axial small holes 32 are communicated with the two air chambers, a step capable of limiting the insulation component is arranged at the near end of the support seat 4, the top cover 10 is connected with the far end thread 29 of the insulation component and is fixed by the support seat 4, so that the top cover 10, the insulation component and the support seat 4 are completely fixed, a thread capable of being connected with the outer nozzle 21 and a fourth sealing ring 7 at a fixed position are arranged on the outer circle of the near end of the support seat 4, the support seat 4 is connected with the copper pipe 16 and is an inlet of plasma gas, a copper pipe inner hole 30 is arranged in the copper pipe 16, a layer of heat shrinkage pipe 17 is arranged outside to play an insulation role, the support seat component wraps the insulation component, the insulation component wraps the piston rod component, the piston rod component can axially move up and down in the inner hole of the insulation component, the piston rod component can be limited by the piston rod near end boss 23 when the piston rod moves up and down, and the piston rod can axially move up and down at the fixed position, thereby achieving the purpose that the piston rod axially moves up and down at the fixed position.
The negative electrode of the main circuit passes through the cable 15, the piston rod 1 and the plasma electrode 19, and the positive electrode of the arc striking circuit passes through the copper gas pipe 16, the supporting seat 4, the outer nozzle 21 and the nozzle 18. Initially, the electrode 19 is in contact with the nozzle 18, when the gas is supplied with electricity, the gas flows into the first gas chamber 31 through the copper gas pipe 16 and then flows into the second gas chamber 33 through the support seat axial small hole 32, a part of the gas flows into the third gas chamber through the splitter radial small hole 34 and then is blown out through the nozzle small hole 37 to be cutting gas, meanwhile, the gas can jack up the piston rod 1 and lift the plasma electrode 19 to axially ascend, and the other part of the gas flows out through the outer nozzle circumferential small hole 35 to be cooling gas. The electrode 19 and the nozzle 18 are ignited after being electrified, plasma gas enables the electrode 19 to rise at the moment of ignition to form arc discharge, and then the gas blown out from the nozzle 18 blows out plasma arc to finish arc ignition.
Example two
As shown in fig. 4 and 9, the piston rod axial small hole 22 of the piston rod 1 is a tapered hole, and is in conical surface fit with the plasma electrode 19, the piston rod and the plasma electrode matched with the piston rod do not need to rotate, at this time, the rotation-preventing pin 11 can be eliminated, meanwhile, a piston rod vent hole 221 is added in the piston rod 1, and the piston rod 1 and the cable 15 are connected and fixed through a piston rod cable connecting hole 222.
EXAMPLE III
As shown in fig. 5, the axial small piston rod hole 22 of the piston rod 1 is a stepped straight hole, a crown spring 223 is accommodated in the stepped straight hole and is matched with the electrode 19, the piston rod and the matched plasma electrode do not need to rotate, at this time, the rotation-preventing pin 11 can be omitted, meanwhile, a piston rod exhaust hole 221 is added in the piston rod 1, and the piston rod 1 and the cable 15 are connected and fixed through a piston rod cable connecting hole 222.
Example four
As shown in fig. 6, the piston rod 1 may be assembled by a piston rod center 226 and a piston ring 225, and the piston ring 225 has a ring groove capable of receiving the first sealing ring 6. The connection between the piston ring 225 and the piston rod center 226 may be a threaded connection, an interference crimping connection, or a clearance fit, and a piston rod sealing ring 224 is added between the two to play a role in sealing and fixing.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a prevent striking sparks, prevent non-high frequency plasma cutting rifle head that falls which characterized in that: comprises a piston rod assembly, a spring (3), an insulating assembly, a supporting seat assembly and a top cover (10);
the piston rod assembly comprises a piston rod (1), a first sealing ring (6), an anti-rotation pin (11), a limiting block (12), a cable (15), a crimping terminal (13) and a connecting screw (14); the insulation component comprises an insulation piece, a second sealing ring (8) and a third sealing ring (9); the supporting seat assembly comprises a supporting seat (4), a fourth sealing ring (7), a copper air pipe (16) and a heat-shrinkable pipe (17);
the head of the near end of the piston rod (1) is provided with a piston rod axial small hole (22), the outer surface of the near end of the piston rod (1) is provided with a boss (23) and a first restraint spring step (26), and the far end of the piston rod (1) is provided with an anti-rotation pin hole, a connecting threaded hole and a clamping groove; the piston rod axial small hole (22) can accommodate a plasma electrode (19), an annular groove capable of accommodating a first sealing ring (6) is formed in the boss (23), a first restraining spring step (26) is a limiting step surface limiting the near end of the spring (3), an anti-rotation pin (11) can be accommodated in the anti-rotation pin hole to limit the rotation of the piston rod, a connection threaded hole is connected with the cable (15) and the crimping terminal (13) through the connection screw (14), and the clamping groove is connected with the limiting block to limit the descending position of the piston rod (1);
the second sealing ring (8) and the third sealing ring (9) are sleeved on the outer circle of the insulating part one above the other, the insulating component accommodates the piston rod (1), an insulating component limiting step (24) and a second restraining spring step (27) are arranged in the insulating component, an insulating component positioning step (25) is arranged outside the insulating component, the insulating component limiting step (24) limits the rising position of the piston rod (1), the second restraining spring step (27) is a limiting step surface for limiting the far end of the spring (3), and the insulating component positioning step (25) is matched with the supporting seat to be used as the near end face for fixing the insulating component;
the supporting seat (4) can accommodate the insulating component, and a first air chamber (31) and a second air chamber (33) are formed between the supporting seat and the insulating component; a plurality of support seat axial small holes (32) are distributed between the first air chamber (31) and the second air chamber (33), the support seat axial small holes (32) are communicated with the two air chambers, a step capable of limiting the insulation assembly is arranged at the near end of the support seat (4), the top cover (10) is connected with the far end screw thread (29) of the insulation assembly and is fixed by the support seat (4), so that the top cover (10), the insulation assembly and the support seat (4) are completely fixed, a screw thread capable of being connected with the outer nozzle (21) and a fourth sealing ring (7) at a fixed position are arranged on the outer circle of the near end of the support seat (4), the support seat (4) is connected with the copper air pipe (16) and is an inlet of plasma gas, a copper air pipe inner hole (30) is arranged in the copper air pipe (16), the support seat assembly wraps the insulation assembly, the piston rod assembly wraps the piston rod assembly, the piston rod assembly can axially move up and down, the piston rod assembly is limited by the piston rod boss (23) when the piston rod assembly descends, and is limited by the limit block (12) at the position when the piston rod assembly moves up and down, so that the piston rod assembly moves up and down.
2. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 1, wherein: plasma electrode (19) with piston rod (1) are connected fixedly, shunt (20) with the laminating of insulating subassembly near-end, nozzle (18) with shunt (20) laminating, outer nozzle (21) with supporting seat (4) near-end threaded connection and with nozzle (18) with shunt (20) are fixed, there are a plurality of shunt radial aperture (34) on shunt (20), there are a plurality of outer nozzle circumference aperture (35) on outer nozzle (21), there is a nozzle aperture (37) on nozzle (18), nozzle (18) shunt (20) with form third air chamber (36) between electrode (19).
3. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 1, wherein: piston rod axial aperture (22) of piston rod (1) are the bell mouth, with plasma electrode (19) are the conical surface cooperation, the piston rod need not rotate with complex plasma electrode, cancel this moment stop pin (11), piston rod (1) inside piston rod exhaust hole (221) that increases simultaneously, piston rod (1) with cable conductor (15) are connected fixedly through piston rod cable connection hole (222).
4. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 1, wherein: piston rod axial aperture (22) of piston rod (1) are the step straight hole, the step straight hole inside hold a crown spring (223) with plasma electrode (19) cooperation, the piston rod need not rotate with complex plasma electrode, cancel this moment stop pin (11), piston rod (1) inside increase piston rod exhaust hole (221) simultaneously, piston rod (1) with cable conductor (15) are connected fixedly through piston rod cable connection hole (222).
5. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 1, wherein: the piston rod (1) is formed by assembling a piston rod central piece (226) and a piston ring (225), and an annular groove capable of accommodating a first sealing ring (6) is formed in the piston ring (225).
6. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 5, wherein: the connection between the piston ring (225) and the piston rod central piece (226) is a threaded connection, or an interference crimping connection, or a clearance fit, and a piston rod sealing ring (224) is added between the piston ring and the piston rod central piece.
7. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 1, wherein: the insulating part is an integral pipe fitting made of high-temperature-resistant insulating materials, or is formed by connecting a plurality of pipe-mounted parts made of high-temperature-resistant insulating materials in a threaded mode up and down.
8. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 1, wherein: and a layer of heat-shrinkable tube (17) is arranged outside the copper air tube (16).
9. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 1, wherein: the clamping groove and the limiting block are matched in a crimping mode, a clamping mode, a threaded connection mode, a riveting mode or a welding mode.
10. An anti-sparking, anti-falling non-high frequency plasma cutting torch head according to claim 1, wherein: the copper air pipe and the supporting seat are fixedly connected through threads, welded or interference pressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221471538.7U CN218638776U (en) | 2022-06-14 | 2022-06-14 | Prevent striking sparks, prevent non-high frequency plasma cutting rifle head that falls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221471538.7U CN218638776U (en) | 2022-06-14 | 2022-06-14 | Prevent striking sparks, prevent non-high frequency plasma cutting rifle head that falls |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218638776U true CN218638776U (en) | 2023-03-17 |
Family
ID=85488238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221471538.7U Active CN218638776U (en) | 2022-06-14 | 2022-06-14 | Prevent striking sparks, prevent non-high frequency plasma cutting rifle head that falls |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218638776U (en) |
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2022
- 2022-06-14 CN CN202221471538.7U patent/CN218638776U/en active Active
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