CN115503379A - Lead core manufacturing and pressing device - Google Patents
Lead core manufacturing and pressing device Download PDFInfo
- Publication number
- CN115503379A CN115503379A CN202211375328.2A CN202211375328A CN115503379A CN 115503379 A CN115503379 A CN 115503379A CN 202211375328 A CN202211375328 A CN 202211375328A CN 115503379 A CN115503379 A CN 115503379A
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- plate
- assembly
- lead
- rotating
- pressing device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
- B43K19/16—Making non-propelling pencils
- B43K19/18—Making pencil writing-cores
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention belongs to the technical field of pencil processing, and particularly relates to a lead pressing device for manufacturing a lead, which comprises a working frame and further comprises: the quantitative lead core extrusion device comprises a feeding assembly for quantitatively conveying raw materials, a bearing assembly for placing the conveyed raw materials, a pressing assembly for extruding the raw materials placed in the bearing assembly to obtain a lead core, and the pressing assembly is mounted on the right side of the top end of a working frame.
Description
Technical Field
The invention relates to the technical field of pencil processing, in particular to a lead pressing device for manufacturing a lead.
Background
The pencils are special pens for writing and drawing sketch, and have a history of more than four hundred years to date, wherein the pencils for drawing sketch are divided into various types, namely, three development stages, namely graphite, wooden penholders and pencils with caps; in addition, the color of the product has stripes such as red and white, black and white, yellow and black, and the like. At present, when a pencil is produced, graphite powder and clay need to be stirred, and after the graphite powder and the clay are uniformly stirred, the graphite powder and the clay are extruded and molded by an extruder.
However, at present, after the lead core is obtained through an extruder, unified cutting is required, so that the production steps are increased, the processing efficiency is reduced, and the cost input is increased.
Disclosure of Invention
The present invention has been made in view of the above and/or other problems with the conventional lead manufacturing and core-pressing apparatus.
Therefore, it is an object of the present invention to provide a lead core manufacturing and pressing apparatus which can solve the above-mentioned problems of the prior art.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
the utility model provides a lead core manufacturing and pressing device which includes the workstation, still includes:
the feeding assembly is used for quantitatively conveying raw materials;
the bearing assembly is used for placing the conveyed raw materials and is arranged at the bottom end of the working frame;
the pressing component is used for performing extrusion forming on the raw materials placed in the bearing component so as to obtain the lead core, and the pressing component is arranged on the right side of the top end of the working frame;
the blanking assembly is used for blanking the extruded lead core;
the second rotating assembly is used for converting the positions of the feeding assembly and the blanking assembly and is arranged on the left side of the top end of the working frame, and the feeding assembly and the blanking assembly are respectively arranged on two sides of the bottom end of the second rotating assembly;
the distance measuring sensor is used for detecting the length of the extruded lead core for the first time and is arranged on the material pressing assembly;
and the length measuring sensor is used for detecting the length of the extruded lead core for the second time and is arranged on the bearing component.
As a preferable aspect of the lead core manufacturing and core pressing device according to the present invention, wherein: the work frame includes:
a base plate;
two groups of supporting rods are fixedly arranged on two sides of the top of the bottom plate;
the roof, the equal two sets of bracing pieces of fixed mounting in bottom both sides of roof.
As a preferable aspect of the lead core manufacturing and core pressing device according to the present invention, wherein: the bearing assembly comprises:
the hollow pipes are used for accommodating the conveyed raw materials, and the number of the hollow pipes is two;
the first rotating assembly is used for converting the positions of the two groups of hollow pipes and is arranged on the bottom plate;
the bracket is used for fixing the hollow pipe and is arranged on the first rotating assembly;
a keep off material subassembly for avoiding the raw materials in the hollow tube to fall away, and the both sides of first rotating assembly all install and keep off the material subassembly.
As a preferable aspect of the lead core manufacturing and core pressing device according to the present invention, wherein: the first rotating assembly includes:
the top of the bottom plate is fixedly provided with the first box body;
the first servo motor is fixedly arranged on the inner wall of the first box body;
the output shaft of the first servo motor is fixedly provided with a rotating shaft, and a support is arranged at the top of the rotating shaft.
As a preferable aspect of the lead core manufacturing and core pressing device according to the present invention, wherein: the bracket includes:
the supporting plate is fixedly installed at the top of the rotating shaft, and the material blocking assemblies are installed on two sides of the supporting plate;
the middle end of the top of the supporting plate is fixedly provided with a vertical rod;
the horizontal pole, the equal fixed mounting horizontal pole in top both ends of montant, and the one end fixed mounting hollow tube of horizontal pole.
As a preferable aspect of the lead core manufacturing and core pressing device according to the present invention, wherein: the material blocking assembly comprises:
the two sides of the supporting plate are fixedly provided with the first box body;
the first air cylinder is fixedly arranged on the inner wall of the first box body;
the output end of the first air cylinder is fixedly provided with a baffle through a piston rod, the top of the baffle is in contact with the bottom of the hollow pipe, and the side wall of the baffle is provided with a length measuring sensor.
As a preferable aspect of the lead core manufacturing and core pressing device according to the present invention, wherein: the second rotating assembly includes:
the second box body is fixedly arranged on one side of the bottom of the top plate;
the second servo motor is fixedly arranged on the inner wall of the second box body;
the output shaft of the second servo motor is fixedly provided with the rotating plate, and the two sides of the bottom of the rotating plate are respectively provided with the feeding assembly and the discharging assembly.
As a preferable aspect of the lead core manufacturing and core pressing device of the present invention, wherein: the material loading subassembly includes:
the L-shaped plate is fixedly arranged on one side of the bottom of the rotating plate;
the annular weight sensor is fixedly arranged on the L-shaped plate;
the bearing plate is fixedly arranged on the annular weight sensor;
the two ends of the top of the bearing plate are fixedly provided with connecting rods;
the two ends of the bottom of the storage box are fixedly provided with connecting rods;
the inner wall of the bottom end of the material storage box is provided with a through hole;
the inner wall of the through hole is fixedly provided with the feeding pipe, and one end of the feeding pipe sequentially penetrates through the bearing plate, the annular weight sensor and the L-shaped plate to extend to the position below the L-shaped plate;
the valve is arranged on the feeding pipe.
As a preferable aspect of the lead core manufacturing and core pressing device according to the present invention, wherein: the unloading subassembly includes:
the other side of the bottom of the rotating plate is fixedly provided with a second box body;
the second cylinder is fixedly arranged on the inner wall of the second box body;
the output end of the second cylinder is fixedly provided with a blanking plate through a piston rod, a hollow pipe is arranged right below the blanking plate, and the blanking plate is connected in the hollow pipe in a sliding mode.
As a preferable aspect of the lead core manufacturing and core pressing device of the present invention, wherein: the material subassembly of pressing includes:
the third box body is fixedly arranged on the other side of the bottom of the top plate;
the third cylinder is fixedly arranged on the inner wall of the third box body;
the extrusion plate, the output of third cylinder passes through piston rod fixed mounting extrusion plate, and is equipped with the hollow tube under the extrusion plate, but extrusion plate sliding connection is in the hollow tube, the top of extrusion plate is equipped with range sensor.
Compared with the prior art:
1. the feeding assembly is arranged to convey the raw materials quantitatively, and the pressing assembly is arranged to extrude the raw materials in an extrusion mode, so that the required processing length is formed by direct extrusion, and the lead core is prevented from being cut in the later stage, so that the processing steps are reduced, the processing efficiency is improved, and the cost input is reduced;
2. the positions of the two groups of hollow pipes are converted by arranging the first rotating assembly, and the positions of the feeding assembly and the blanking assembly are converted by arranging the second rotating assembly, so that the effect of continuously working the whole structure is realized, and the processing efficiency is improved;
3. the raw materials are put into the hollow pipe, blocked by the blocking component and extruded by the pressing component, so that the extruded lead core has high compactness and is not easy to loosen, and the quality of the lead core is greatly improved;
4. the length of the lead core is detected by the distance measuring sensor and the length measuring sensor, so that the effect of avoiding the later stage to detect the length of the lead core is achieved, the processing steps can be further reduced, the processing efficiency is improved, and the investment of cost is reduced.
Drawings
FIG. 1 is a schematic front view of the structure of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1 according to the present invention;
FIG. 3 is a top view of the carriage assembly of the present invention;
FIG. 4 is a schematic bottom view of the rotating plate of the present invention;
FIG. 5 is a schematic front view of a loading assembly of the present invention;
FIG. 6 is a schematic front view of a swaging assembly of the present invention;
FIG. 7 is a schematic view of the connection of the carrier plate and the connecting rod according to the present invention;
FIG. 8 is a schematic view of the inventive work bench.
In the figure: the device comprises a working frame 10, a bottom plate 11, a support rod 12, a top plate 13, a bearing component 20, a support 21, a support plate 211, a vertical rod 212, a cross rod 213, a hollow tube 22, a first rotating component 23, a first box 231, a first servo motor 232, a rotating shaft 233, a material blocking component 24, a first box 241, a first air cylinder 242, a baffle 243, a feeding component 30, an L-shaped plate 31, an annular weight sensor 32, a bearing plate 33, a connecting rod 34, a material storage box 35, a through hole 36, a feeding pipe 37, a valve 38, a discharging component 40, a second box 41, a second air cylinder 42, a discharging plate 43, a second rotating component 50, a second box 51, a second servo motor 52, a rotating plate 53, a material pressing component 60, a third box 61, a third air cylinder 62, a squeezing plate 63, a distance measuring sensor 70 and a length measuring sensor 80.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a lead core manufacturing and pressing device, please refer to fig. 1-8, which comprises a working frame 10, a feeding assembly 30 for quantitatively conveying raw materials, a bearing assembly 20 for placing the conveyed raw materials, a pressing assembly 60 for extruding and forming the raw materials placed in the bearing assembly 20 so as to obtain lead cores, a blanking assembly 40 for blanking the extruded and formed lead cores, a second rotating assembly 50 for converting the positions of the feeding assembly 30 and the blanking assembly 40, a distance measuring sensor 70 for primarily detecting the lengths of the extruded and formed lead cores, and a length measuring sensor 80 for secondarily detecting the lengths of the extruded and formed lead cores;
and the bearing component 20 is installed on the bottom end of the working frame 10, the material pressing component 60 is installed on the right side of the top end of the working frame 10, the second rotating component 50 is installed on the left side of the top end of the working frame 10, the feeding component 30 and the discharging component 40 are installed on two sides of the bottom end of the second rotating component 50 respectively, the distance measuring sensor 70 is installed on the material pressing component 60, and the length measuring sensor 80 is installed on the bearing component 20.
The work frame 10 includes: a bottom plate 11, a support rod 12 and a top plate 13;
two sets of bracing pieces 12 of equal fixed mounting in top both sides of bottom plate 11, two sets of bracing pieces 12 of equal fixed mounting in bottom both sides of roof 13.
The carrier assembly 20 includes: the device comprises hollow pipes 22 for accommodating conveyed raw materials, a first rotating assembly 23 for converting the positions of two groups of the hollow pipes 22, a bracket 21 for fixing the hollow pipes 22, and a material blocking assembly 24 for preventing the raw materials in the hollow pipes 22 from falling out;
and the hollow tubes 22 are two sets, and the first rotating assembly 23 is installed on the bottom plate 11 and the bracket 21 is installed on the first rotating assembly 23, and the material blocking assemblies 24 are installed on both sides of the first rotating assembly 23.
The first rotating assembly 23 includes: a first case 231, a first servo motor 232, a rotation shaft 233;
the first box 231 is fixedly installed on the top of the bottom plate 11, the first servo motor 232 is fixedly installed on the inner wall of the first box 231, the rotating shaft 233 is fixedly installed on the output shaft of the first servo motor 232, and the support 21 is installed on the top of the rotating shaft 233.
The bracket 21 includes: support plate 211, vertical bar 212, horizontal bar 213;
the supporting plate 211 is fixedly installed at the top of the rotating shaft 233, the material blocking assemblies 24 are installed on two sides of the supporting plate 211, the vertical rods 212 are fixedly installed at the middle end of the top of the supporting plate 211, the cross rods 213 are fixedly installed at two ends of the top of the vertical rods 212, and the hollow tubes 22 are fixedly installed at one ends of the cross rods 213.
The dam assembly 24 includes: a first case 241, a first cylinder 242, a baffle 243;
the two sides of the supporting plate 211 are fixedly provided with the first box body 241, the first cylinder 242 is fixedly arranged on the inner wall of the first box body 241, the output end of the first cylinder 242 is fixedly provided with the baffle 243 through the piston rod, the top of the baffle 243 is contacted with the bottom of the hollow tube 22, and the side wall of the baffle 243 is provided with the length measuring sensor 80.
The second rotating assembly 50 includes: a second box 51, a second servo motor 52, and a rotating plate 53;
the second box body 51 is fixedly installed on one side of the bottom of the top plate 13, the second servo motor 52 is fixedly installed on the inner wall of the second box body 51, the output shaft of the second servo motor 52 is fixedly installed with the rotating plate 53, and the two sides of the bottom of the rotating plate 53 are respectively installed with the feeding assembly 30 and the discharging assembly 40.
The feeding assembly 30 includes: the device comprises an L-shaped plate 31, a circular ring type weight sensor 32, a bearing plate 33, a connecting rod 34, a storage box 35, a through hole 36, a feeding pipe 37 and a valve 38;
Unloading subassembly 40 includes: a second box 41, a second cylinder 42, and a blanking plate 43;
the other side of the bottom of the rotating plate 53 is fixedly provided with a second box body 41, a second air cylinder 42 is fixedly arranged on the inner wall of the second box body 41, the output end of the second air cylinder 42 is fixedly provided with a blanking plate 43 through a piston rod, a hollow tube 22 is arranged right below the blanking plate 43, and the blanking plate 43 is connected in the hollow tube 22 in a sliding manner.
The material pressing assembly 60 includes: a third box body 61, a third cylinder 62 and an extrusion plate 63;
The working principle is as follows: the weight of the conveyed raw material is set according to the required processing length, at this time, the raw material stored in the storage box 35 falls into a group of hollow tubes 22 through the valve 38 until the value on the circular ring type weight sensor 32 reaches the set value, after that, the rotating shaft 233 is rotated through the first servo motor 232 until the group of hollow tubes 22 are positioned right below the extrusion plate 63, after that, the extrusion plate 63 is lowered through the third air cylinder 62, the lowered extrusion plate 63 is inserted into the hollow tubes 22 to realize extrusion molding of the raw material in the hollow tubes 22, after extrusion molding, whether the length of the extruded lead core reaches the requirement is detected through the distance measuring sensor 70, at the same time, after extrusion molding, the extrusion plate 63 is returned to the original position, then, the hollow tubes 22 are positioned right below the feeding tube 37 through the first rotating assembly 23, after that, the rotating plate 53 is rotated through the second servo motor 52 until the hollow tubes 22 are positioned right below the blanking plate 43, when the hollow tubes 22 are positioned right below the blanking plate 43, the blanking baffle 243 is moved to ensure that the length of the lead core is positioned right below the blanking plate 30, when the hollow tubes is positioned right below the blanking baffle plate 43, the blanking of the hollow tubes 22 is lowered through the second rotating cylinder 43, the blanking baffle 243, when the blanking of the hollow tubes is detected, the blanking baffle plate is positioned right below the blanking sensor 30, the blanking of the blanking cylinder 43, the blanking baffle 42, the blanking of the blanking lead core is repeatedly lowered lead core, the blanking plate 42, the blanking cylinder, the blanking baffle 42 is detected again, when the pressing assembly 60 performs extrusion molding on the raw materials in one group of the hollow tubes 22, the blanking assembly 40 and the feeding assembly 30 blank the lead cores in the other group of the hollow tubes 22 and inject the raw materials into the lead cores, so as to achieve continuous operation.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A lead core manufacturing and pressing device comprises a working frame (10), and is characterized by further comprising:
a feeding assembly (30) for quantitatively conveying the raw materials;
the bearing assembly (20) is used for placing the conveyed raw materials, and the bearing assembly (20) is installed on the bottom end of the working frame (10);
the pressing component (60) is used for performing extrusion forming on the raw materials placed in the bearing component (20) so as to obtain lead cores, and the pressing component (60) is installed on the right side of the top end of the working frame (10);
a blanking assembly (40) used for blanking the extrusion-molded lead core;
the second rotating assembly (50) is used for converting the positions of the feeding assembly (30) and the discharging assembly (40), the second rotating assembly (50) is installed on the left side of the top end of the working frame (10), and the feeding assembly (30) and the discharging assembly (40) are installed on two sides of the bottom end of the second rotating assembly (50) respectively;
the distance measuring sensor (70) is used for detecting the length of the extruded lead core for the first time, and the distance measuring sensor (70) is arranged on the pressing assembly (60);
and the length measuring sensor (80) is used for detecting the length of the extruded lead core for the second time, and the length measuring sensor (80) is installed on the bearing component (20).
2. The lead manufacturing core pressing device according to claim 1, wherein said work frame (10) comprises:
a base plate (11);
two groups of supporting rods (12) are fixedly arranged on two sides of the top of the bottom plate (11);
the supporting device comprises a top plate (13), wherein two groups of supporting rods (12) are fixedly mounted on two sides of the bottom of the top plate (13).
3. A lead manufacturing core pressing device according to claim 2, wherein said carrier assembly (20) comprises:
hollow pipes (22) used for accommodating the conveyed raw materials, and the hollow pipes (22) are divided into two groups;
a first rotating assembly (23) used for converting the positions of the two groups of hollow pipes (22), and the first rotating assembly (23) is arranged on the bottom plate (11);
a bracket (21) for fixing the hollow tube (22), and the bracket (21) is mounted on a first rotating assembly (23);
the material blocking component (24) is used for preventing raw materials in the hollow pipe (22) from falling out, and the material blocking component (24) is arranged on both sides of the first rotating component (23).
4. A lead making and pressing device as claimed in claim 3, wherein said first rotating assembly (23) comprises:
the top of the bottom plate (11) is fixedly provided with the first box body (231);
the first servo motor (232), the said first servo motor (232) is fixedly mounted on inner wall of the first container (231);
the output shaft of the first servo motor (232) is fixedly provided with the rotating shaft (233), and the top of the rotating shaft (233) is provided with the bracket (21).
5. A lead making and pressing device according to claim 4, characterized in that said support (21) comprises:
the top of the rotating shaft (233) is fixedly provided with the supporting plate (211), and the two sides of the supporting plate (211) are provided with the material blocking assemblies (24);
the top middle end of the supporting plate (211) is fixedly provided with the vertical rod (212);
the top both ends of montant (212) are all fixed mounting horizontal pole (213), and the one end fixed mounting hollow tube (22) of horizontal pole (213).
6. The lead manufacturing core pressing device according to claim 5, wherein the striker assembly (24) comprises:
the two sides of the supporting plate (211) are both fixedly provided with the first box body (241);
the first air cylinder (242), the said first air cylinder (242) is fixedly mounted on inner wall of the first container (241);
the output end of the first air cylinder (242) is fixedly provided with the baffle (243) through a piston rod, the top of the baffle (243) is in contact with the bottom of the hollow pipe (22), and the side wall of the baffle (243) is provided with a length measuring sensor (80).
7. A lead making and pressing device according to claim 2, wherein said second rotating assembly (50) comprises:
the second box body (51), the said second box body (51) is fixedly mounted on one side of bottom of the roof (13);
the second servo motor (52), the said second servo motor (52) is fixedly mounted on inboard wall of the second container (51);
the output shaft of the second servo motor (52) is fixedly provided with the rotating plate (53), and the two sides of the bottom of the rotating plate (53) are respectively provided with the feeding assembly (30) and the discharging assembly (40).
8. A lead making and core pressing device according to claim 7, wherein said feeding assembly (30) comprises:
the L-shaped plate (31) is fixedly arranged on one side of the bottom of the rotating plate (53);
the annular weight sensor (32), the annular weight sensor (32) is fixedly arranged on the L-shaped plate (31);
the bearing plate (33), the bearing plate (33) is fixedly installed on the circular ring type weight sensor (32);
the two ends of the top of the bearing plate (33) are fixedly provided with the connecting rods (34);
the storage box (35), the two ends of the bottom of the storage box (35) are both fixedly provided with connecting rods (34);
the through hole (36) is formed in the inner wall of the bottom end of the material storage box (35);
the inner wall of the through hole (36) is fixedly provided with the feeding pipe (37), and one end of the feeding pipe (37) sequentially penetrates through the bearing plate (33), the annular weight sensor (32) and the L-shaped plate (31) and extends to the position below the L-shaped plate (31);
the valve (38), the valve (38) is arranged on the feeding pipe (37).
9. The lead making and core pressing device according to claim 7, wherein said blanking assembly (40) comprises:
the other side of the bottom of the rotating plate (53) is fixedly provided with the second box body (41);
the second air cylinder (42), the said second air cylinder (42) is fixedly mounted on inner wall of the second box (41);
the output end of the second cylinder (42) is fixedly provided with the blanking plate (43) through a piston rod, a hollow pipe (22) is arranged under the blanking plate (43), and the blanking plate (43) is connected in the hollow pipe (22) in a sliding mode.
10. A lead making core pressing device according to claim 1, wherein said pressing assembly (60) comprises:
the third box body (61), the said third box body (61) is fixedly mounted on another side of bottom of the roof (13);
the third air cylinder (62), the said third air cylinder (62) is fixedly mounted on inboard wall of the third box (61);
stripper plate (63), piston rod fixed mounting stripper plate (63) is passed through to the output of third cylinder (62), and is equipped with hollow tube (22) under stripper plate (63), but stripper plate (63) sliding connection is in hollow tube (22), the top of stripper plate (63) is equipped with range sensor (70).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211375328.2A CN115503379B (en) | 2022-11-04 | 2022-11-04 | Core pressing device for manufacturing lead cores |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211375328.2A CN115503379B (en) | 2022-11-04 | 2022-11-04 | Core pressing device for manufacturing lead cores |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115503379A true CN115503379A (en) | 2022-12-23 |
| CN115503379B CN115503379B (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211375328.2A Active CN115503379B (en) | 2022-11-04 | 2022-11-04 | Core pressing device for manufacturing lead cores |
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| Country | Link |
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| CN (1) | CN115503379B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115980555A (en) * | 2023-03-20 | 2023-04-18 | 无锡祺芯半导体科技有限公司 | Intelligent chip packaging test equipment |
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| CN105856904A (en) * | 2016-04-20 | 2016-08-17 | 王保春 | Full-automatic paper-holder pencil holder rolling unit, production device comprising same and production method |
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| Publication number | Publication date |
|---|---|
| CN115503379B (en) | 2023-06-23 |
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