CN113100562B - Metal-coated brush wire production process and production equipment thereof - Google Patents
Metal-coated brush wire production process and production equipment thereof Download PDFInfo
- Publication number
- CN113100562B CN113100562B CN202110534894.2A CN202110534894A CN113100562B CN 113100562 B CN113100562 B CN 113100562B CN 202110534894 A CN202110534894 A CN 202110534894A CN 113100562 B CN113100562 B CN 113100562B
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- mounting plate
- brush
- shearing
- sliding
- screw rod
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46D—MANUFACTURE OF BRUSHES
- A46D1/00—Bristles; Selection of materials for bristles
- A46D1/04—Preparing bristles
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46D—MANUFACTURE OF BRUSHES
- A46D1/00—Bristles; Selection of materials for bristles
- A46D1/04—Preparing bristles
- A46D1/06—Machines or apparatus for cutting bristles
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a production process and production equipment of a metal-coated brush wire. The automatic shearing device comprises a workbench, a moving device and a collecting device are fixedly arranged on the workbench, the shearing device is arranged on the moving device, the moving device is used for moving the shearing device, when the shearing device shears the brush wires, the shearing device and the moving brush wires are relatively static, and the collecting device is used for collecting the sheared brush wires. The invention discloses a production process and production equipment of a metal-sheathed brush wire, which can solve the problems of complicated cutting procedures and difficult straightening of bent brush wires after the existing brush wires are coiled.
Description
Technical Field
The invention relates to the technical field of brush wire production, in particular to a metal-coated brush wire production process and production equipment thereof.
Background
The brush wire is a component which is arranged on the environmental sanitation brush and used for cleaning the ground, and comprises a plastic brush wire, a metal brush wire and a metal wrapping brush wire, wherein the metal wrapping brush wire is formed by wrapping a layer of plastic protection skin on the outer side of a metal wire.
Brush silk is when production, after the metal brush silk outside parcel one deck protection skin, can be rolled up, brush silk after will rolling is sheared into the length that needs at last as required, because the rolling is crossed the back brush silk and is laminated the wind-up roll and take place arc deformation, because the brush silk need keep straight when the installation, need straighten the operation to the brush silk, very waste time and energy, influence work efficiency, because the iron wire toughness ratio that the brush silk needs is higher, so the iron wire after the bending is difficult to become straight in time by the pulling force, also influence subsequent installation of brush silk and final product looks.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention discloses a production process and production equipment of a metal-sheathed brush wire, which can solve the problems of complicated cutting procedures after the existing brush wire is rolled and difficult straightening of the bent brush wire.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a production process of a metal-sheathed brush wire comprises the following steps;
s1, winding a plurality of strands of iron wires together, and adding a plastic raw material into a plastic coating machine for heating and melting;
s2, feeding the wound iron wire into a plastic coating machine through a roller feeding device, coating a protective skin on the outer side of the iron wire to form brush wires, and introducing the brush wires into a cooling water tank for cooling and shaping;
s3, conveying the shaped brush wires through a roller feeding device, and conveying the brush wires into production equipment to cut and collect the brush wires;
s4, one end of the brush wire passes through the limiting hole until the brush wire enters the lower portion of the sensor and is sensed by the sensor, the driving motor works, the brush wire is cut while the moving device drives the cutting device to move, and the cut brush wire falls into the collecting device and is collected.
The production equipment of the metal wrapped brush wire comprises a workbench, wherein a moving device and a collecting device are fixedly arranged on the workbench, a shearing device is arranged on the moving device, the moving device is used for moving the shearing device, when the shearing device shears the brush wire, the shearing device and the moving brush wire are relatively static, and the collecting device is used for collecting the sheared brush wire.
The technical scheme who prefers, the mobile device includes first mounting panel and second mounting panel, first mounting panel and second mounting panel are fixed on the workstation surface, and rotate between the two and be connected with reciprocal lead screw, reciprocal lead screw one end is rotated and is passed first mounting panel, and the fixed driving motor that is equipped with in top, the driving motor output is fixed with reciprocal lead screw, the last fixed connecting rod that is equipped with of driving motor, connecting rod one end is fixed on first mounting panel, threaded connection has first slider on the reciprocal lead screw, sliding connection has first litter on the first slider, first litter both ends are fixed with first mounting panel and second mounting panel respectively, the fixed shearing mechanism that is equipped with on the first slider.
The preferred technical scheme, shearing mechanism is including installation piece and mounting bracket, installation piece fixed mounting is at the side of first slider, the mounting bracket is the L type, and fixed mounting is on the top of first slider, it is connected with two-way lead screw to rotate on the installation piece, two-way lead screw one end is rotated with the mounting bracket and is connected, and the installation piece is passed in the other end transmission, and the fixed first awl tooth that is equipped with in top, two-way lead screw both ends threaded connection all has the second slider, sliding connection has the second litter on the second slider, second litter one end is fixed with the mounting bracket, and the other end is fixed with the installation piece, the meshing has the second toper tooth on the first awl tooth, it is connected with the connecting cylinder to rotate on the second toper tooth, the fixed mounting that is equipped with on the connecting cylinder, mounting one end is fixed with the installation piece, swing joint has transmission on the second toper tooth.
The utility model provides a preferred technical scheme, be equipped with the mounting groove on the second slider, it has the shearing sword to slide to peg graft in the mounting groove, the fixed spring that is equipped with on the shearing sword, the spring is arranged in the mounting groove, and one end is fixed, two with the second slider the cutting edge of shearing sword is relative, the fixed limiting plate that is equipped with on the mounting bracket, be equipped with spacing hole on the limiting plate, spacing hole site is in two shearing sword middles.
According to the preferable technical scheme, the transmission device comprises a transmission rod, one end of the transmission rod is rotatably connected with the second mounting plate, the other end of the transmission rod rotatably penetrates through the first mounting plate, a first gear is fixedly mounted at the top end of the transmission rod, a plurality of grooves are formed in the transmission rod, the transmission rod sequentially penetrates through the connecting cylinder and the second conical tooth in a sliding mode, a plurality of convex teeth are arranged on the second conical tooth and are inserted in the grooves in a sliding mode, the first gear is meshed with the second gear, and the second gear is fixed with the reciprocating screw rod.
The technical scheme who prefers, be equipped with the spout on the workstation, sliding connection has the roll adjustment board in the spout, the fixed installed part that is equipped with in roll adjustment board top, the fixed sensor that is equipped with on the installed part, be equipped with the chute on the roll adjustment board, horizontal coincidence between chute top and the spacing hole, second mounting panel top is established to the slope, and with chute bottom surface horizontal coincidence, the sensor is located directly over the chute top, and with driving motor electrical connection, the chute below is connected with collection device.
According to the preferable technical scheme, the collecting device comprises a collecting box, the collecting box is fixed on a mounting plate, a guide plate is fixedly installed at the top end of the collecting box, the guide plate is installed in an inclined mode, and the top end of the guide plate is located below the inclined groove and is abutted to the distance adjusting plate and the second mounting plate.
(III) advantageous effects
The invention discloses a production process and production equipment of a metal-coated brush wire, which have the following advantages:
the cooled brush filaments penetrate through the limiting hole until the cooled brush filaments are conveyed to the position below the sensor to be sensed by the sensor, the driving motor starts to work, and the distance between the sensor and the shearing device can be adjusted by moving the distance adjusting plate, so that the length of the sheared brush filaments is controlled.
The driving motor works to drive the reciprocating screw rod and the second gear to rotate, the reciprocating screw rod rotates to drive the first sliding block to slide along the first sliding rod, the shearing device is driven to move, the shearing device and the running brush wire can be kept static relatively when being sheared, and the situation that the top end of the brush wire is extruded when being sheared to deform the brush wire is avoided.
The second gear rotates to drive the first gear to rotate, the transmission rod is driven to rotate, the second bevel gear is driven to rotate, the first bevel gear is driven to rotate, the two-way screw rod is driven to rotate, the second sliding block is driven to slide along the second sliding rod, and the two shearing knives are driven to move oppositely to shear the brush wire.
Wherein, cut the sword and slide and peg graft in the second slider, after the sword accomplishes the shearing work to the brush silk, first slider return cuts the sword and separates each other, cuts the sword and can extrude the brush silk before the complete separation, cuts the sword slip and can reduce the pressure that the brush silk received, cuts the sword after separating, and the spring makes and cuts the sword return.
Wherein, the brush silk after being cut is extruded spacing hole by the brush silk that removes, and the collection box is collected in the landing entering of chute and slope is unified.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is an overall schematic of an embodiment of the present invention;
FIG. 2 is another perspective view of an embodiment of the present invention;
FIG. 3 is a schematic view of a shearing device according to an embodiment of the present invention;
FIG. 4 is a second slider diagram of an embodiment of the present invention;
FIG. 5 is an enlarged view of area A of FIG. 1;
fig. 6 is an enlarged view of the region B in fig. 5.
Wherein: 1 workbench, 2 moving devices, 3 collecting devices, 4 shearing devices, 5 first mounting plates, 6 second mounting plates, 7 reciprocating screw rods, 8 driving motors, 9 connecting rods, 10 first sliding blocks, 11 first sliding rods, 12 mounting blocks, 13 mounting frames, 14 bidirectional screw rods, 15 first conical teeth, 16 second sliding blocks, 17 second sliding rods, 18 second conical teeth, 19 connecting cylinders, 20 fixing pieces, 21 transmission devices, 22 mounting grooves, 23 shearing knives, 24 springs, 25 limiting plates, 26 limiting holes, 27 transmission rods, 28 first gears, 29 grooves, 30 convex teeth, 31 second gears, 32 sliding grooves, 33 distance adjusting plates, 34 mounting pieces, 35 sensors, 36 sliding grooves, 37 slopes, 38 collecting boxes and 39 guide plates.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The production process of the metal-sheathed brush wire comprises the following steps of;
s1, winding a plurality of strands of iron wires together, and adding a plastic raw material into a plastic coating machine for heating and melting;
s2, feeding the wound iron wire into a plastic coating machine through a roller feeding device, coating a protective skin on the outer side of the iron wire to form brush wires, and introducing the brush wires into a cooling water tank for cooling and shaping;
s3, conveying the shaped brush wires through a roller feeding device, and conveying the brush wires into production equipment to cut and collect the brush wires;
s4, one end of the brush wire passes through the limiting hole 26 until the brush wire enters the lower portion of the sensor 35 and is sensed by the sensor 35, the driving motor 8 is driven to work, the moving device 2 drives the shearing device 4 to move and shear the brush wire, and the sheared brush wire falls into the collecting device 3 and is collected.
In addition, as shown in fig. 1 to 6, the apparatus for manufacturing a metal-sheathed brush wire according to an embodiment of the present invention includes a table 1, a moving device 2 and a collecting device 3 are fixedly mounted on the table 1, the moving device 2 is mounted with a cutting device 4, the moving device 2 is configured to move the cutting device 4, when the cutting device 4 cuts the brush wire, the cutting device 4 and the moving brush wire are relatively stationary, and the collecting device 3 is configured to collect the cut brush wire.
As shown in fig. 2, the mobile device 2 includes a first mounting plate 5 and a second mounting plate 6, the first mounting plate 5 and the second mounting plate 6 are fixed on the surface of the workbench 1, and the reciprocating lead screw 7 is connected between the two in a rotating manner, one end of the reciprocating lead screw 7 is rotated to pass through the first mounting plate 5, and the top end of the reciprocating lead screw is fixedly provided with the driving motor 8, the output end of the driving motor 8 is fixed with the reciprocating lead screw 7, the driving motor 8 is fixedly provided with the connecting rod 9, one end of the connecting rod 9 is fixed on the first mounting plate 5, the reciprocating lead screw 7 is provided with a first slider 10 in a threaded manner, the first slider 10 is provided with a first slide rod 11 in a sliding manner, two ends of the first slide rod 11 are respectively fixed with the first mounting plate 5 and the second mounting plate 6, the first slider 10 is provided with a shearing device 4 in a fixed manner, wherein the driving motor 8 drives the reciprocating lead screw 7 to rotate, and drives the first slider 10 to slide along the first slide rod 11.
As shown in fig. 3, the shearing apparatus 4 includes a mounting block 12 and a mounting frame 13, the mounting block 12 is fixedly mounted on the side of the first slider 10, the mounting frame 13 is L-shaped, and is fixedly mounted on the top end of the first slider 10, a bidirectional screw rod 14 is rotatably connected to the mounting block 12, one end of the bidirectional screw rod 14 is rotatably connected to the mounting frame 13, the other end of the bidirectional screw rod is driven to pass through the mounting block 12, and a first bevel gear 15 is fixedly mounted on the top end of the mounting block 13, both ends of the bidirectional screw rod 14 are both connected to a second slider 16 through threads, a second sliding rod 17 is slidably connected to the second slider 16, one end of the second sliding rod 17 is fixed to the mounting frame 13, the other end of the second sliding rod is fixed to the mounting block 12, a second bevel gear 18 is engaged to the first bevel gear 15, a connecting cylinder 19 is rotatably connected to the second bevel gear 18, a fixing member 20 is fixedly mounted to the connecting cylinder 19, one end of the fixing member 20 is fixed to the mounting block 12, a transmission device 21 is movably connected to the second bevel gear 18, wherein the first bevel gear 18 rotates to drive the bidirectional screw rod to rotate to drive the second slider 16 to move along the second sliding rod 17.
As shown in fig. 4, be equipped with mounting groove 22 on the second slider 16, it has shearing sword 23 to slide to peg graft in the mounting groove 22, the fixed spring 24 that is equipped with on the shearing sword 23, spring 24 is arranged in mounting groove 22, and one end is fixed with second slider 16, two the cutting edge of shearing sword 23 is relative, the fixed limiting plate 25 that is equipped with on the mounting bracket 13, be equipped with spacing hole 26 on the limiting plate 25, spacing hole 26 is located two shearing sword 23 middles.
As shown in fig. 5, the transmission device 21 includes a transmission rod 27, one end of the transmission rod 27 is rotatably connected to the second mounting plate 6, the other end of the transmission rod 27 rotatably passes through the first mounting plate 5, and a first gear 28 is fixedly mounted at the top end of the transmission rod 27, the transmission rod 27 is provided with a plurality of grooves 29 and sequentially slidably passes through the connecting cylinder 19 and the second bevel gear 18, the second bevel gear 18 is provided with a plurality of convex teeth 30, the plurality of convex teeth 30 are slidably inserted into the grooves 29, the first gear 28 is engaged with a second gear 31, and the second gear 31 is fixed to the reciprocating screw rod 7, wherein the reciprocating screw rod 7 rotates to drive the second gear 31 to rotate, which drives the first gear 28 to rotate, which drives the transmission rod 27 to rotate, and drives the second bevel gear 18 to rotate.
As shown in fig. 1 and 2, a chute 32 is arranged on the workbench 1, a distance adjusting plate 33 is slidably connected to the chute 32, a mounting part 34 is fixedly mounted at the top end of the distance adjusting plate 33, a sensor 35 is fixedly mounted on the mounting part 34, a chute 36 is arranged on the distance adjusting plate 33, the top end of the chute 36 horizontally coincides with the limiting hole 26, a slope 37 is arranged at the top end of the second mounting plate 6 and horizontally coincides with the bottom surface of the chute 36, the sensor 35 is positioned right above the top end of the chute 36 and is electrically connected with the driving motor 8, and a collecting device 3 is connected below the chute 36.
In the scheme: the type Y80M1-2 is preferably selected as the driving motor 8, a power supply interface of the motor is connected with a power supply system through a switch, a motor operation circuit is a normal and reverse rotation control program of a conventional motor, the circuit operation is the conventional circuit, the circuits and the control related in the scheme are the prior art, and redundant description is not repeated herein.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A production process of a metal-sheathed brush wire is characterized by comprising the following steps;
s1, winding a plurality of strands of iron wires together, and adding a plastic raw material into a plastic coating machine for heating and melting;
s2, feeding the wound iron wire into a plastic coating machine through a roller feeding device, coating a protective skin on the outer side of the iron wire to form brush wires, and introducing the brush wires into a cooling water tank for cooling and shaping;
s3, conveying the shaped brush wires through the roller feeding device, conveying the brush wires into production equipment, shearing and collecting the brush wires, enabling one ends of the brush wires to pass through the limiting holes until the brush wires enter the lower portion of the sensor and are sensed by the sensor, enabling the driving motor to work, enabling the moving device to drive the shearing device to move and shear the brush wires, and enabling the sheared brush wires to fall into the collecting device and be collected;
the metal sheath brush wire production equipment comprises a workbench, wherein a moving device and a collecting device are fixedly arranged on the workbench, a shearing device is arranged on the moving device, the moving device is used for moving the shearing device, when the shearing device shears brush wires, the shearing device and the moving brush wires are relatively static, and the collecting device is used for collecting the sheared brush wires;
the moving device comprises a first mounting plate and a second mounting plate, the first mounting plate and the second mounting plate are fixed on the surface of the workbench, a reciprocating screw rod is rotatably connected between the first mounting plate and the second mounting plate, one end of the reciprocating screw rod rotatably penetrates through the first mounting plate, a driving motor is fixedly arranged at the top end of the reciprocating screw rod, the output end of the driving motor is fixed with the reciprocating screw rod, a connecting rod is fixedly arranged on the driving motor, one end of the connecting rod is fixed on the first mounting plate, a first sliding block is connected onto the reciprocating screw rod in a threaded manner, a first sliding rod is slidably connected onto the first sliding block, two ends of the first sliding rod are respectively fixed with the first mounting plate and the second mounting plate, and a shearing device is fixedly arranged on the first sliding block;
the shearing device comprises an installation block and an installation frame, the installation block is fixedly installed on the side edge of the first sliding block, the installation frame is L-shaped and is fixedly installed at the top end of the first sliding block, a bidirectional screw rod is connected to the installation block in a rotating mode, one end of the bidirectional screw rod is connected with the installation frame in a rotating mode, the other end of the bidirectional screw rod penetrates through the installation block in a transmission mode, first bevel gears are fixedly installed at the top end of the bidirectional screw rod, two ends of the bidirectional screw rod are in threaded connection with second sliding blocks, installation grooves are formed in the second sliding blocks, shearing knives are inserted into the installation grooves in a sliding mode, springs are fixedly installed on the shearing knives and located in the installation grooves, one ends of the second sliding rods are fixed to the installation block, cutting edges of the two shearing knives are opposite to each other, limiting plates are fixedly installed on the installation frame, limiting plates are arranged on the limiting plates, the limiting holes are located between the centers of the two shearing knives in a sliding mode, a second sliding rod is connected to the second sliding block in a sliding mode, second bevel gears are meshed with the first bevel gears, a connecting cylinder is connected to the connecting cylinder fixedly installed on the fixing piece, one end of the fixing piece, and a movable transmission device is connected to the second bevel gears;
the transmission device comprises a transmission rod, one end of the transmission rod is rotatably connected with the second mounting plate, the other end of the transmission rod rotatably penetrates through the first mounting plate, a first gear is fixedly arranged at the top end of the transmission rod, a plurality of grooves are formed in the transmission rod and sequentially and slidably penetrate through the connecting cylinder and the second conical tooth, a plurality of convex teeth are arranged on the second conical tooth and are slidably inserted into the grooves, a second gear is meshed with the first gear, and the second gear is fixed with the reciprocating screw rod.
2. The process for producing a metal-sheathed brush wire according to claim 1, wherein: be equipped with the spout on the workstation, sliding connection has the roll adjustment board in the spout, roll adjustment board top end fixed mounting has, the fixed sensor that is equipped with on the mounting piece, be equipped with the chute on the roll adjustment board, horizontal coincidence between chute top and the spacing hole, second mounting panel top is established to the slope, and with chute bottom surface horizontal coincidence, the sensor is located directly over the chute top, and with driving motor electrical connection, the chute below is connected with collection device.
3. The process for producing a metal-sheathed brush wire according to claim 1, wherein: the collecting device comprises a collecting box, the collecting box is fixed on a mounting plate, a guide plate is fixedly arranged at the top end of the collecting box, the guide plate is obliquely arranged, and the top end of the guide plate is located below the inclined groove and is abutted to the distance adjusting plate and the second mounting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110534894.2A CN113100562B (en) | 2021-05-17 | 2021-05-17 | Metal-coated brush wire production process and production equipment thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110534894.2A CN113100562B (en) | 2021-05-17 | 2021-05-17 | Metal-coated brush wire production process and production equipment thereof |
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| CN113100562A CN113100562A (en) | 2021-07-13 |
| CN113100562B true CN113100562B (en) | 2022-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328324A (en) * | 2011-06-21 | 2012-01-25 | 淄博航康商贸有限公司 | Hard-object cutting device |
| CN106891540A (en) * | 2017-03-15 | 2017-06-27 | 安徽省潜山县鑫烨塑刷有限公司 | A kind of brush filament constant temperature setting process |
| CN107125915A (en) * | 2017-04-18 | 2017-09-05 | 安徽振达刷业有限公司 | A kind of compound brush filament production technology |
| CN211803562U (en) * | 2019-10-11 | 2020-10-30 | 大连收获金属纤维有限公司 | Steel wire shearing mechanism with adjustable |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1137131A (en) * | 1965-01-11 | 1968-12-18 | United Eng Foundry Co | Shears |
| CN112756514A (en) * | 2021-01-26 | 2021-05-07 | 上海莘翔自动化科技有限公司 | Shearing and bending device |
-
2021
- 2021-05-17 CN CN202110534894.2A patent/CN113100562B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328324A (en) * | 2011-06-21 | 2012-01-25 | 淄博航康商贸有限公司 | Hard-object cutting device |
| CN106891540A (en) * | 2017-03-15 | 2017-06-27 | 安徽省潜山县鑫烨塑刷有限公司 | A kind of brush filament constant temperature setting process |
| CN107125915A (en) * | 2017-04-18 | 2017-09-05 | 安徽振达刷业有限公司 | A kind of compound brush filament production technology |
| CN211803562U (en) * | 2019-10-11 | 2020-10-30 | 大连收获金属纤维有限公司 | Steel wire shearing mechanism with adjustable |
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| CN113100562A (en) | 2021-07-13 |
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