CN213383134U - Grease production squeezes forming device with many spirals dregs of fat - Google Patents
Grease production squeezes forming device with many spirals dregs of fat Download PDFInfo
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- CN213383134U CN213383134U CN202020641921.7U CN202020641921U CN213383134U CN 213383134 U CN213383134 U CN 213383134U CN 202020641921 U CN202020641921 U CN 202020641921U CN 213383134 U CN213383134 U CN 213383134U
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Abstract
The utility model discloses a grease production squeezes forming device with many spirals dregs of fat, include: the device comprises a compression pipeline, a discharge hole is formed in the bottom end of the compression pipeline, a central input pipeline is connected to the upper end of the compression pipeline, a material distribution funnel is connected to the upper end of the central input pipeline, and a feeding funnel is arranged above the material distribution funnel; the side input pipeline is arranged on the outer side of the central input pipeline, a spiral compression plate is arranged inside the side input pipeline, and a transmission shaft is arranged in the middle of the spiral compression plate. The utility model discloses an in the compression pipeline outside around the side input pipeline who sets up a plurality of supplementary compressions, thereby can make a plurality of helical compression boards compress the dregs of fat simultaneously, thereby increase the compression dynamics, improve dregs of fat compression ratio and compression density, and the cake forming die of device comprises arc base plate and semicircle curb plate combination, the semicircle curb plate can be opened through connecting the pivot to the outside rotation, thereby the cake of fat that will compress wherein fast is complete to be unloaded, it is higher to unload convenient and fast more and cake shaping quality.
Description
Technical Field
The utility model relates to a grease production and processing equipment especially indicates a grease production is with many spirals dregs of fat squeeze forming device.
Background
The oil mainly comprises vegetable oil and animal oil, but no matter vegetable oil or animal oil is produced, oil residue can be produced after primary production, the oil residue also has certain oil, and in order to separate the oil in the oil residue, the waste is reduced, and the oil residue needs to be squeezed. The applicant finds that most of the existing oil residue squeezing devices are of spiral structures, namely, the oil residue is compressed and squeezed by utilizing the spiral plates, but the common spiral oil residue squeezing devices generally only comprise one or two spiral plates, if the compression force is increased, the diameter of a compression cylinder is generally required to be reduced or the power of a motor is increased, the treatment efficiency can be reduced by reducing the diameter of the compression cylinder, the cost can be increased by increasing the power of the motor, the structural strength is required to be higher, meanwhile, the oil residue can be compressed into a cake shape after being squeezed so as to be convenient for transportation, but the common compression discharging and forming structure is difficult to completely unload the compressed oil cake, the oil cake is easy to crack, and subsequent transportation and processing work are inconvenient.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a grease production is with many spirals dregs of fat squeeze forming device.
Based on above-mentioned purpose the utility model provides a pair of grease production squeezes forming device with many spirals dregs of fat, include:
the device comprises a compression pipeline, a discharge hole is formed in the bottom end of the compression pipeline, a central input pipeline is connected to the upper end of the compression pipeline, a material distribution funnel is connected to the upper end of the central input pipeline, and a feeding funnel is arranged above the material distribution funnel;
the side input pipeline is arranged on the outer side of the central input pipeline, a spiral compression plate is arranged in the side input pipeline, a transmission shaft is arranged in the middle of the spiral compression plate, and the upper end of the transmission shaft is connected with a compression motor;
the sealing top plate is arranged below the discharge port, a communication port is formed in the outer side of the sealing top plate, a central rotary drum is arranged in the middle of the sealing top plate, and a transmission gear ring is arranged on the outer side of the central rotary drum;
the sealing bottom plate is arranged below the sealing top plate, a discharge opening is formed in the outer side of the sealing bottom plate, a filter plate is arranged in the middle of the sealing bottom plate, and expansion slide rails are symmetrically arranged on the left side and the right side of the filter plate;
the arc-shaped substrate is arranged above the filter plate, a tracing roller is arranged on the rear side of the arc-shaped substrate, a return spring is arranged above the tracing roller, segmented telescopic rods are symmetrically arranged on the left side and the right side of the return spring, and connecting rotating shafts are arranged at the left end and the right end of the arc-shaped substrate;
the semicircular side plate is arranged on the outer side of the arc-shaped base plate and is rotationally connected with the arc-shaped base plate through the connecting rotating shaft, a connecting shaft is arranged on the outer side of the semicircular side plate, and a guide pulley is arranged below the connecting shaft;
the central fixed shaft is nested on the inner side of the central rotary drum, an elliptical guide lug is arranged in the middle of the central fixed shaft, a driving motor is arranged above the central fixed shaft, and a driving gear is arranged at the shaft end of the driving motor.
In some alternative embodiments, the vertical center line of the compression pipe and the vertical center line of the central input pipe are located on the same straight line, and the side input pipes are uniformly arranged in a circumferential manner around the periphery of the vertical center line of the compression pipe.
In some alternative embodiments, the vertical centerline of the compression conduit is angled 15 degrees from the vertical centerline of the side inlet conduit.
In some optional embodiments, the vertical center line of the compression pipeline and the vertical center line of the communication port are located on the same straight line, and the bottom end face of the compression pipeline and the top face of the sealing top plate are attached to each other.
In some optional embodiments, the arc-shaped base plate and the semicircular side plate are connected and combined through a connecting rotating shaft to form a perfect circular structure, and the size of the perfect circular structure formed by the arc-shaped base plate and the semicircular side plate is matched with that of the compression pipeline.
In some optional embodiments, the semicircular side plate is slidably connected with the expansion sliding rail through the guide pulley, and the expansion angle of the semicircular side plate is greater than 120 degrees when the semicircular side plate moves to the outermost end of the expansion sliding rail.
In some optional embodiments, the arc-shaped base plate is connected with the elliptical guide lug through the tracking roller, and the horizontal center line of the segmented telescopic rod is perpendicular to the vertical center line of the central drum.
In some alternative embodiments, the difference between the major axis and the minor axis of the elliptical guide projection is equal to the distance between the discharge opening and the communication opening, i.e., the horizontal movement distance of the arc-shaped substrate.
From the above, can see out, the utility model provides a pair of grease production squeezes forming device with many spirals dregs of fat, through the side input pipeline around setting up a plurality of supplementary compressions in the compression pipeline outside, thereby can make a plurality of spiral compression boards compress the dregs of fat simultaneously, thereby increase the compression dynamics, improve dregs of fat compression ratio and compression density, and the cake forming die of device comprises arc base plate and semicircle curb plate combination, the semicircle curb plate can rotate to the outside through connecting the pivot and open, thereby it is complete to unload the cake of wherein compression fast, the deformation process of semicircle curb plate goes on automatically through oval direction lug simultaneously, alright unload in the time of center rotary drum pivoted, it is higher to unload convenient and fast and cake shaping quality more.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic front structural view of an embodiment of the present invention;
fig. 3 is an exploded schematic view of an embodiment of the present invention;
fig. 4 is a schematic top view of an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a compression pipeline according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a sealing top plate according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a sealing bottom plate according to an embodiment of the present invention;
fig. 8 is a schematic structural view of a semicircular side plate according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an arc-shaped substrate according to an embodiment of the present invention;
fig. 10 is a schematic structural view illustrating an expanded state of the semicircular side plate according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are only used for convenience of expression and should not be understood as limitations to the embodiments of the present invention, and the following embodiments do not describe any more.
As an embodiment, a multi-screw oil residue pressing and forming device for oil production comprises:
the device comprises a compression pipeline 1, a discharge hole 101 is formed in the bottom end of the compression pipeline 1, a central input pipeline 102 is connected to the upper end of the compression pipeline, a distribution hopper 103 is connected to the upper end of the central input pipeline 102, and a feeding hopper 104 is arranged above the distribution hopper 103;
the side input pipeline 2 is arranged on the outer side of the central input pipeline 102, a spiral compression plate 201 is arranged in the side input pipeline, a transmission shaft 202 is arranged in the middle of the spiral compression plate 201, and the upper end of the transmission shaft 202 is connected with a compression motor 203;
the sealing top plate 3 is arranged below the discharge port 101, a communication port 301 is formed in the outer side of the sealing top plate, a central rotating cylinder 302 is arranged in the middle of the sealing top plate, and a transmission gear ring 303 is arranged on the outer side of the central rotating cylinder 302;
the sealing bottom plate 4 is arranged below the sealing top plate 3, the outer side of the sealing bottom plate is provided with a discharge port 401, the middle of the sealing bottom plate is provided with a filter plate 402, and the left side and the right side of the filter plate 402 are symmetrically provided with expansion slide rails 403;
the arc-shaped substrate 5 is arranged above the filter plate 402, a tracing roller 501 is arranged on the rear side of the arc-shaped substrate 5, a return spring 502 is arranged above the tracing roller 501, segmented telescopic rods 503 are symmetrically arranged on the left side and the right side of the return spring 502, and connecting rotating shafts 504 are arranged at the left end and the right end of the arc-shaped substrate 5;
the semicircular side plate 6 is arranged on the outer side of the arc-shaped base plate 5 and is rotatably connected with the arc-shaped base plate 5 through a connecting rotating shaft 504, a connecting shaft 601 is arranged on the outer side of the semicircular side plate 6, and a guide pulley 602 is arranged below the connecting shaft 601;
the central fixed shaft 7 is nested inside the central drum 302, an elliptical guide lug 701 is arranged in the middle, a driving motor 702 is arranged above the central fixed shaft, and a driving gear 703 is arranged at the shaft end of the driving motor 702.
Referring to fig. 1 to 9, as an embodiment of the present invention, a multi-spiral oil residue squeezing and forming device for oil production includes: the device comprises a compression pipeline 1, a discharge hole 101 is formed in the bottom end of the compression pipeline 1, a central input pipeline 102 is connected to the upper end of the compression pipeline, a distribution hopper 103 is connected to the upper end of the central input pipeline 102, and a feeding hopper 104 is arranged above the distribution hopper 103; the side input pipeline 2 is arranged on the outer side of the central input pipeline 102, a spiral compression plate 201 is arranged in the side input pipeline, a transmission shaft 202 is arranged in the middle of the spiral compression plate 201, and the upper end of the transmission shaft 202 is connected with a compression motor 203; the sealing top plate 3 is arranged below the discharge port 101, a communication port 301 is formed in the outer side of the sealing top plate, a central rotating cylinder 302 is arranged in the middle of the sealing top plate, and a transmission gear ring 303 is arranged on the outer side of the central rotating cylinder 302; the sealing bottom plate 4 is arranged below the sealing top plate 3, the outer side of the sealing bottom plate is provided with a discharge port 401, the middle of the sealing bottom plate is provided with a filter plate 402, and the left side and the right side of the filter plate 402 are symmetrically provided with expansion slide rails 403; the arc-shaped substrate 5 is arranged above the filter plate 402, a tracing roller 501 is arranged on the rear side of the arc-shaped substrate 5, a return spring 502 is arranged above the tracing roller 501, segmented telescopic rods 503 are symmetrically arranged on the left side and the right side of the return spring 502, and connecting rotating shafts 504 are arranged at the left end and the right end of the arc-shaped substrate 5; the semicircular side plate 6 is arranged on the outer side of the arc-shaped base plate 5 and is rotatably connected with the arc-shaped base plate 5 through a connecting rotating shaft 504, a connecting shaft 601 is arranged on the outer side of the semicircular side plate 6, and a guide pulley 602 is arranged below the connecting shaft 601; the central fixed shaft 7 is nested inside the central drum 302, an elliptical guide lug 701 is arranged in the middle, a driving motor 702 is arranged above the central fixed shaft, and a driving gear 703 is arranged at the shaft end of the driving motor 702.
Referring to fig. 2 to 5, optionally, the vertical center line of the compression pipe 1 and the vertical center line of the central input pipe 102 are located on the same straight line, the side input pipes 2 are uniformly arranged around the periphery of the vertical center line of the compression pipe 1 in a circumferential manner, the included angle between the vertical center line of the compression pipe 1 and the vertical center line of the side input pipe 2 is 15 degrees, the device uses the compression pipe 1 as a compression space for oil residue, the central input pipe 102 with a slightly smaller diameter is connected above the compression pipe 1, the oil residue can be input into the compression pipe 1 through the central input pipe 102, meanwhile, the upper end of the compression pipe 1 is provided with a plurality of side input pipes 2 around, each side input pipe 2 is provided with a spiral compression plate 201, the spiral compression plate 201 can convey and compress the oil residue downwards, so that the oil residue is compressed in the compression pipe 1, the plurality of spiral compression plates 201 work together, so that the compression capacity can be improved under the condition that the diameter of the compression pipeline 1 is kept unchanged, and the compression oil yield of the oil residue is improved.
Referring to fig. 3 to 7, optionally, the vertical center line of the compression pipe 1 and the vertical center line of the communication port 301 are located on the same straight line, the bottom end surface of the compression pipe 1 and the top surface of the sealing top plate 3 are attached to each other, the arc-shaped base plate 5 and the semicircular side plate 6 are connected and combined through the connecting rotating shaft 504 to form a perfect circular structure, the perfect circular structure formed by the arc-shaped base plate 5 and the semicircular side plate 6 is matched with the compression pipe 1 in size, the oil residue compressed in the compression pipe 1 is output through the discharge port 101 at the bottom end of the compression pipe 1 and passes through the communication port 301, and then enters the compression mold formed by the arc-shaped base plate 5 and the semicircular side plate 6 below, the diameter of the compression mold formed by the arc-shaped base plate 5 and the semicircular side plate 6 is the same as the diameter of the compression pipe 1, and the pressure is continuously applied to the oil residue above the mold, the oil leaks out through the filter plate 402 under the compression mold, so that the oil cake is formed to complete the compression work.
Referring to fig. 3 to 10, optionally, the semicircular side plate 6 is slidably connected to the expansion slide rail 403 through the guide pulley 602, when the semicircular side plate 6 moves to the outermost end of the expansion slide rail 403, the expansion angle is greater than 120 degrees, the arc-shaped substrate 5 is connected to the elliptical guide projection 701 through the tracing roller 501, the horizontal center line of the segmented expansion rod 503 is perpendicular to the vertical center line of the central drum 302, the distance difference between the major axis and the minor axis of the elliptical guide projection 701 is equal to the distance between the discharge opening 401 and the communication opening 301, i.e., the horizontal movement distance of the arc-shaped substrate 5, the compression mold of the device is a split structure and is formed by combining the arc-shaped substrate 5 and two semicircular side plates 6, during the compression process, the arc-shaped substrate 5 and the semicircular side plates 6 contract into a complete circular mold, and after the oil residue is compressed and formed therein, the arc-shaped, semicircle curb plate 6 just slides in expansion slide rail 403 through leading pulley 602, thereby make semicircle curb plate 6 rotate through connecting pivot 504 to the outside expansion, the mould that makes arc base plate 5 and semicircle curb plate 6 constitute is opened, thereby can take out wherein fashioned oil cake is complete, prevent that the oil cake is broken, and because arc base plate 5 and semicircle curb plate 6 rotate along central rotary drum 302, and the rotation in-process, the rear side of arc base plate 5 removes outside fixed oval guide lug 701 through seeking mark gyro wheel 501, thereby make arc base plate 5 follow oval guide lug 701 and carry out synchronous motion, make arc base plate 5 be located oval guide lug 701 minor axis direction and compress, and automatic horizontal migration unloads when being located major axis direction, and it is more convenient to use.
When in use, the corresponding pipelines of the device are firstly connected, then the oil residue is put into the device through the feeding funnel 104, the oil residue falls into the distribution funnel 103 through the feeding funnel 104, then the oil residue is uniformly dispersed into the central input pipeline 102 at the center and the side input pipeline 2 surrounding the outer side of the central input pipeline 102 through the distribution funnel 103, the spiral compression plate 201 in each side input pipeline 2 is driven to rotate through the transmission shaft 202 and the compression motor 203, the oil residue moves from top to bottom, the oil residue is extruded by the upper pressure and continues to move downwards for compression after entering the compression pipeline 1, then the oil residue is input into the compression mould formed by the arc-shaped base plate 5 and the semicircular side plate 6 through the discharge port 101 and the communication port 301, the oil residue is filled into the compression mould by the pressure, the oil in the compression mould leaks to the lower part through the filter plate 402 and is output, when the oil residue is compressed to a certain degree, the driving motor 702 drives the central, the central rotary drum 302 drives the sealing top plate 3, the sealing bottom plate 4 and the compression mold to synchronously rotate, when the compression mold rotates to leave the compression pipeline 1, the sealing top plate 3 seals the discharge port 101 of the compression pipeline 1, the rear side of the arc-shaped substrate 5 moves on the fixed elliptical guide lug 701 through the tracing roller 501, so as to push the arc-shaped substrate 5 to horizontally move, the arc-shaped substrate 5 keeps stable structure through the segmented telescopic rod 503 on the rear side, and the arc-shaped substrate 5 synchronously pushes the semicircular side plate 6 to move, so that the semicircular side plate 6 slides in the expansion slide rail 403 through the guide pulley 602, so as to enable the semicircular side plate 6 to expand and rotate outwards through the connecting rotary shaft 504, when the arc-shaped substrate 5 rotates to the major axis direction of the elliptical guide lug 701, the semicircular side plate 6 is completely opened, and the oil cake moves to the discharge port 401 to naturally fall down to, after the other mold is compressed, the central drum 302 continues to rotate, the semicircular side plate 6 retracts by being pulled by the return spring 502, and when the semicircular side plate 6 moves to the short axis direction of the elliptical guide projection 701, the semicircular side plate 6 and the arc-shaped base plate 5 complete retraction and closing to continue to perform compression work, namely compression cycle work, on the compression mold.
The utility model provides a grease production squeezes forming device with many spirals dregs of fat, through 1 outside at the compression pipeline around setting up the side input pipeline 2 of a plurality of supplementary compressions, thereby can make a plurality of spiral compression boards 201 compress the dregs of fat simultaneously, thereby increase the compression dynamics, improve dregs of fat compression ratio and compression density, and the cake forming die of device comprises arc base plate 5 and the combination of semicircle curb plate 6, semicircle curb plate 6 can rotate to the outside through connecting pivot 504 and open, thereby it is complete to unload the cake of oil of compression wherein fast, the deformation process of semicircle curb plate 6 goes on through ellipse direction lug 701 is automatic simultaneously, alright unload in the time of center rotary drum 302 pivoted, it is higher to unload convenient and fast and cake shaping quality more.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also combinations between technical features in the above embodiments or in different embodiments are possible, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. The utility model provides a grease production is with many spirals dregs of fat squeeze forming device which characterized in that includes:
the device comprises a compression pipeline, a discharge hole is formed in the bottom end of the compression pipeline, a central input pipeline is connected to the upper end of the compression pipeline, a material distribution funnel is connected to the upper end of the central input pipeline, and a feeding funnel is arranged above the material distribution funnel;
the side input pipeline is arranged on the outer side of the central input pipeline, a spiral compression plate is arranged in the side input pipeline, a transmission shaft is arranged in the middle of the spiral compression plate, and the upper end of the transmission shaft is connected with a compression motor;
the sealing top plate is arranged below the discharge port, a communication port is formed in the outer side of the sealing top plate, a central rotary drum is arranged in the middle of the sealing top plate, and a transmission gear ring is arranged on the outer side of the central rotary drum;
the sealing bottom plate is arranged below the sealing top plate, a discharge opening is formed in the outer side of the sealing bottom plate, a filter plate is arranged in the middle of the sealing bottom plate, and expansion slide rails are symmetrically arranged on the left side and the right side of the filter plate;
the arc-shaped substrate is arranged above the filter plate, a tracing roller is arranged on the rear side of the arc-shaped substrate, a return spring is arranged above the tracing roller, segmented telescopic rods are symmetrically arranged on the left side and the right side of the return spring, and connecting rotating shafts are arranged at the left end and the right end of the arc-shaped substrate;
the semicircular side plate is arranged on the outer side of the arc-shaped base plate and is rotationally connected with the arc-shaped base plate through the connecting rotating shaft, a connecting shaft is arranged on the outer side of the semicircular side plate, and a guide pulley is arranged below the connecting shaft;
the central fixed shaft is nested on the inner side of the central rotary drum, an elliptical guide lug is arranged in the middle of the central fixed shaft, a driving motor is arranged above the central fixed shaft, and a driving gear is arranged at the shaft end of the driving motor.
2. The multi-screw oil residue squeezing and forming device for oil production according to claim 1, wherein the vertical center line of the compression pipeline and the vertical center line of the central input pipeline are located on the same straight line, and the lateral input pipelines are uniformly arranged around the periphery of the vertical center line of the compression pipeline in a circumferential manner.
3. The multi-spiral oil residue squeezing and forming device for oil production according to claim 1, wherein an included angle between a vertical center line of the compression pipeline and a vertical center line of the side input pipeline is 15 degrees.
4. The multi-spiral oil residue squeezing and forming device for oil production according to claim 1, wherein a vertical center line of the compression pipeline and a vertical center line of the communication port are located on the same straight line, and a bottom end face of the compression pipeline and a top face of the sealing top plate are attached to each other.
5. The multi-spiral oil residue squeezing and forming device for oil production according to claim 1, wherein the arc-shaped base plate and the semicircular side plates are connected and combined through a connecting rotating shaft to form a perfect circular structure, and the size of the perfect circular structure formed by the arc-shaped base plate and the semicircular side plates is matched with that of the compression pipeline.
6. The multi-spiral oil residue squeezing and forming device for oil production according to claim 1, wherein the semicircular side plate is slidably connected with the expansion slide rail through the guide pulley, and the expansion angle of the semicircular side plate is greater than 120 degrees when the semicircular side plate moves to the outermost end of the expansion slide rail.
7. The multi-spiral oil residue squeezing and forming device for oil production as claimed in claim 1, wherein the arc-shaped base plate is connected with the elliptical guide projection through the tracing roller, and the horizontal center line of the segmented telescopic rod is perpendicular to the vertical center line of the central rotary drum.
8. The multi-screw apparatus for pressing and forming pomace for manufacturing oil and fat according to claim 1, wherein the difference between the major axis and the minor axis of the elliptical guide projection is equal to the distance between the discharge opening and the communication opening, i.e. the horizontal movement distance of the arc-shaped base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020641921.7U CN213383134U (en) | 2020-04-25 | 2020-04-25 | Grease production squeezes forming device with many spirals dregs of fat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020641921.7U CN213383134U (en) | 2020-04-25 | 2020-04-25 | Grease production squeezes forming device with many spirals dregs of fat |
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| Publication Number | Publication Date |
|---|---|
| CN213383134U true CN213383134U (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020641921.7U Expired - Fee Related CN213383134U (en) | 2020-04-25 | 2020-04-25 | Grease production squeezes forming device with many spirals dregs of fat |
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| Country | Link |
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| CN (1) | CN213383134U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194305A (en) * | 2022-08-11 | 2022-10-18 | 林永耿 | Plasma arc welding machine |
-
2020
- 2020-04-25 CN CN202020641921.7U patent/CN213383134U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194305A (en) * | 2022-08-11 | 2022-10-18 | 林永耿 | Plasma arc welding machine |
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Granted publication date: 20210608 |