CN112222316A - Computer case stamping waste recovery device and operation method - Google Patents
Computer case stamping waste recovery device and operation method Download PDFInfo
- Publication number
- CN112222316A CN112222316A CN202011146134.6A CN202011146134A CN112222316A CN 112222316 A CN112222316 A CN 112222316A CN 202011146134 A CN202011146134 A CN 202011146134A CN 112222316 A CN112222316 A CN 112222316A
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- China
- Prior art keywords
- rocker arm
- support
- material tray
- punch
- wedge
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/02—Ejecting devices
- B21D45/04—Ejecting devices interrelated with motion of tool
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Cutting Devices (AREA)
- Punching Or Piercing (AREA)
Abstract
The computer case stamping waste recovery device comprises a punch, a pressing plate, a rocker, a torsional spring, a support, a material ejection column, a waste collecting tank, a workbench, a material tray and a machine tool, wherein the machine tool is provided with the workbench, the right side of the workbench is fixedly connected with the support, a support shaft is arranged in the middle of the support, the rocker is arranged outside the support shaft, a rocker hole is formed in the middle of the rocker, the support shaft is rotatably connected with the rocker hole, the rocker rotates on the support, the outer side of the rocker is connected with the torsional spring, the torsional spring is sleeved outside the rocker, a connecting arm is arranged on the upper portion of the rocker, an upper fixing claw is arranged on the upper portion of the torsional spring, a lower fixing claw is arranged.
Description
Technical Field
The invention relates to the field of computer case processing, in particular to a computer case punching waste recovery device and an operation method.
Background
In the computer case stamping process, because the continuity and the high frequency of stamping operation can continuously produce a large amount of waste materials, the waste materials are accumulated to a certain degree, the work can not be continued, the machine must be stopped to clean the work, the time and the labor are wasted, the labor efficiency is influenced, and the labor intensity of operators is increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an efficient and automatic computer case stamping waste recovery device and an operation method.
The purpose of the invention is realized by the following technical scheme:
a computer case stamping waste recovery device comprises a punch, a pressing plate, a rocker arm, a torsional spring, a support, a material ejection column, a waste collection tank, a workbench, a material tray and a machine tool, wherein the machine tool is provided with the workbench, the right side of the workbench is fixedly connected with the support, a support shaft is arranged in the middle of the support, the rocker arm is arranged outside the support shaft, a rocker arm hole is formed in the middle of the rocker arm, the support shaft is rotatably connected with the rocker arm hole, the rocker arm rotates on the support, the torsional spring is connected with the outer side of the rocker arm in a sleeved mode, the upper portion of the rocker arm is provided with a connecting arm, the upper portion of the torsional spring is provided with an upper fixing claw, the lower portion of the rocker arm is provided with a lower fixing claw, the upper fixing claw is fixed on the connecting arm, the lower fixing claw is fixed on the support, the upper portion of the rocker arm and the connecting arm are provided, the clamp plate fixed connection drift, the lathe is connected to the drift, the linking arm has on the left of the rocking arm, the linking arm left side has the material receiving frame, it catches the groove to have the material receiving in the middle of the material receiving frame, the material receiving frame left side has a work or material rest chain seat, the material receiving frame right side has the charging tray to support, work or material rest chain seat upper portion sets up the charging tray, the charging tray left side has the charging tray free bearing, work or material rest chain seat articulates the charging tray free bearing, the charging tray free bearing can be rotatory around work or material rest chain seat, the charging tray right side is placed on the charging tray supports, be used for making the charging tray be in the horizontality, the charging tray has the hopper in the middle of the charging tray, the charging tray front side has the charging tray export, the workstation front side sets up the.
An operation method of a computer case stamping waste recovery device comprises the following steps:
the first step is as follows: when the punch moves downwards, the pressing plate moves downwards along with the punch, the pressing plate drives the wedge-shaped surface to downwards press the pressing rod sleeve together when moving downwards, so that the rocker arm generates a rotating moment, the rocker arm can rotate anticlockwise by taking the support shaft as an axis, when the rocker arm rotates under the action of the wedge-shaped surface, the torsion spring can be twisted along with the rocker arm, and thus a material tray connected with the rocker arm rotates anticlockwise above the waste collecting tank when moving downwards on the wedge-shaped surface;
the second step is that: when the material is close to the waste collecting tank, the ejecting wedge-shaped surface generates an ejecting force under the material tray, so that the material tray is lifted around the hinge to generate a gradient, the product can slide down to a chute of the waste collecting tank from a material tray outlet of the material tray along the gradient and slide down to the waste collecting device in the chute,
the third step: when the punch moves upwards and the wedge-shaped surface moves upwards, the torsion spring releases elastic potential energy to force the rocker arm to rotate clockwise, the material tray reaches the lower part of the punch before blanking after the punching is finished, and then the waste material is ejected by the punch and just falls into a hopper of the material tray.
Has the advantages that:
1. the automatic punching machine is free of any external power device, generates a power source by means of the motion of the punching machine, is convenient to install, simple to debug, accurate in action and excellent in using effect, timely cleans waste materials generated in the punching process, avoids accumulation and shutdown cleaning, greatly improves labor efficiency, reduces labor intensity, and completely avoids manual operation because collected waste materials can be carried out by the machine.
2. The right side of the workbench is fixedly connected with a support which is a base of the workbench, the support bears the action of load and conversion motion, a support shaft is arranged in the middle of the support, a rocker arm is arranged outside the support shaft, the rocker arm plays the action of material conversion and material receiving and bears the power transmitted by a machine tool, a material tray is arranged in the middle of the rocker arm, the support shaft is rotatably connected with a rocker arm hole, the support shaft rotates in the rocker arm hole, the outer side of the rocker arm is connected with a torsion spring which is sleeved outside the rocker arm and converts the power and the motion transmitted by the machine tool into the torsional potential energy of the spring, when the power of the machine tool is lost, the connecting arm and the material tray are restored to the initial state by the potential energy of the spring, the upper fixed claw and the lower fixed claw are correspondingly fixed on the support of the fixed part and the rocker arm of the rotating part, when the support and the, when the wedge-shaped surface moves downwards, the compression rod sleeve is pressed to push the compression rod sleeve to rotate around the axis of the rocker arm, the wedge-shaped surface and the compression rod sleeve can slide relatively, the compression rod sleeve can rotate around the compression rod to convert sliding friction into rolling friction, thereby converting the sliding into the rotation to form the thrust, the action is accurate, the friction force of the pressure lever sleeve relative to the wedge-shaped surface is reduced, thereby reducing the abrasion of the wedge-shaped surface and the pressure lever, prolonging the service life, forming thrust to enable the rocker arm to rotate, enabling the material tray to rotate along with the rocker arm for receiving waste materials which fall into the hopper, from the charging tray export roll-off, the workstation front side sets up the liftout post, and liftout post upper portion has the liftout wedge face, and the liftout wedge face is used for jack-up charging tray, and the liftout wedge face adopts the inclined plane structure, prevents to strike, and the jack-up process is steady, and the action is accurate, and the spout adopts the inclined plane structure equally, lets the automatic landing of waste material, need not power and manual work.
Drawings
Fig. 1 is a schematic view of the overall structure of the punching and discharging device of the present invention.
Fig. 2 is a schematic structural view of the punching discharging device of the invention.
Fig. 3 is a schematic view of the structure of the pressure plate according to the present invention.
Fig. 4 is a schematic structural view of the liftout column according to the present invention.
Fig. 5 is a schematic view of the tray structure of the present invention.
Fig. 6 is a schematic diagram of a material receiving position according to the present invention.
Fig. 7 is a schematic view of a material returning position according to the present invention.
Detailed Description
The invention is explained in more detail below with reference to the figures and examples:
a computer case punching waste recovery device comprises a punch 01, a pressing plate 02, a rocker arm 03, a torsion spring 04, a support 05, an ejection column 06, a waste collection tank 07, a workbench 08, a tray 09 and a machine tool, wherein the machine tool is provided with the workbench 08, the right side of the workbench 08 is fixedly connected with the support 05, the middle of the support 05 is provided with a support shaft 51, the outer part of the support shaft 51 is provided with the rocker arm 03, the middle of the rocker arm 03 is provided with a rocker arm hole 32, the support shaft 51 is rotatably connected with the rocker arm hole 32, the rocker arm 03 rotates on the support 05, the outer side of the rocker arm 03 is connected with the torsion spring 04, the torsion spring 04 is sleeved outside the rocker arm 03, the upper part of the rocker arm 03 is provided with a connecting arm 35, the upper part of the torsion spring 04 is provided with an upper fixing claw 41, the lower part of the torsion spring 04 is provided with a lower fixing claw 42, the upper fixing, the pressing rod sleeve 39 rotates on the pressing rod 31, the outer side of the pressing rod sleeve 39 contacts the pressing plate 02, the pressing plate 02 is L-shaped, the right side of the pressing plate 02 is provided with a wedge-shaped surface 21, the pressing rod sleeve 39 contacts the wedge-shaped surface 21, the pressing plate 02 is fixedly connected with the punch 01, and the punch 01 is connected with a machine tool.
The left side of the rocker arm 03 is provided with a connecting arm 35, the left side of the connecting arm 35 is provided with a material receiving frame 33, the middle of the material receiving frame 33 is provided with a material receiving grabbing groove 38, the left side of the material receiving frame 33 is provided with a material receiving frame chain seat 37, the right side of the material receiving frame 33 is provided with a material tray support 34, the upper part of the material receiving frame chain seat 37 is provided with a material tray 09, the left side of the material tray 09 is provided with a material tray hinged seat 92, the material tray hinged seat 37 is hinged with the material tray hinged seat 92, the material tray hinged seat 92 can rotate around the material receiving frame chain seat 37, the right side of the material tray 09 is placed on the material tray support 34 and used for enabling the material tray 09 to be in a horizontal state, the middle of the material tray 09 is provided with a material hopper 93, the front side of the material tray 09 is provided with a material tray outlet 91, the front side of the workbench 08.
An operation method of a computer case stamping waste recovery device comprises the following steps:
the first step is as follows: when the punch 01 descends, the pressing plate 02 moves downwards along with the punch 01, the pressing plate 02 drives the wedge-shaped surface 21 to descend together to press the rod sleeve 39, the rocker arm 03 generates a rotating moment, the rocker arm 03 rotates anticlockwise by taking the support shaft 51 as an axis, when the rocker arm 03 rotates under the action of the wedge-shaped surface 21, the torsion spring 04 twists along with the rocker arm 03, and thus the material tray 09 connected with the rocker arm 03 rotates anticlockwise to the position above the waste collecting tank 07 when the wedge-shaped surface 21 descends;
the second step is that: when approaching the garbage collection groove 07, the ejecting wedge surface 61 generates an ejecting force under the tray 09 to lift the tray 09 around the hinge, so as to generate a gradient, and the product slides down along the gradient from the tray outlet 91 of the tray 09 to the chute 71 of the garbage collection groove 07, slides down in the chute 71 to the garbage collection device,
the third step: when the punch 01 moves upwards and the wedge-shaped surface 21 moves upwards, the torsion spring 04 releases elastic potential energy to force the rocker arm 03 to rotate clockwise, the material disc 09 reaches the lower part of the punch 01 before blanking after the punching is finished, and then the waste is pushed down by the punch 01 and just falls into the hopper 93 of the material disc 09.
The right side of the workbench 08 is fixedly connected with a support 05, the support 05 is a base of the invention and is used for bearing load and converting motion, a support shaft 51 is arranged in the middle of the support 05, a rocker arm 03 is arranged outside the support shaft 51, the rocker arm 03 plays the role of transferring and receiving materials and bears the power transmitted by a machine tool, a material tray 09 is arranged in the middle of the rocker arm 03, the support shaft 51 is rotatably connected with a rocker arm hole 32, the support shaft 51 rotates in the rocker arm hole 32, the outer side of the rocker arm 03 is connected with a torsion spring 04, the torsion spring 04 is sleeved outside the rocker arm 03, the torsion spring 04 converts the power and motion transmitted by the machine tool into the torsional potential energy of a spring, when the power of the machine tool is lost, the connecting arm 35 and the material tray 09 are restored to the initial state by the potential energy of the spring, the upper fixing claw 41 and the lower fixing claw 42 are correspondingly fixed on the support 05 and the rocker, the movement is converted into torsional potential energy, the connecting arm 35 and the pressure rod 31 are mutually vertical, when the wedge-shaped surface 21 moves downwards, the pressure rod sleeve 39 is pressed, the pressure rod sleeve 39 is pushed to rotate around the axis of the rocker arm 03, the wedge-shaped surface 21 and the pressure rod sleeve 39 can slide relatively, the pressure rod sleeve 39 can rotate around the pressure rod 31, the sliding friction is converted into rolling friction, the sliding is converted into rotating, the pushing force is formed, the action is accurate, the friction force of the pressure rod sleeve 39 relative to the wedge-shaped surface 21 is reduced, the force is saved, the clamping is avoided, the abrasion of the wedge-shaped surface 21 and the pressure rod 31 is reduced, the service life is prolonged, the pushing force is formed, the rocker arm 03 rotates, the material tray 09 rotates along with the rocker arm 03 and is used for receiving waste materials, the waste materials fall into the hopper 93 and slide out from the material tray outlet 91, the material ejecting column 06 is arranged on the front side of the workbench 08, the material ejecting column 06 is provided with, liftout wedge 61 adopts the inclined plane structure, prevents to strike, and the jack-up process is steady, and the action is accurate, and spout 71 adopts the inclined plane structure equally, lets the automatic landing of waste material, need not power and manual work. The pressing plate 02 moves up and down along with the punch 01 during punching, the pressing plate 02 moves down to drive the wedge-shaped surface 21 to move down together to press the pressing rod sleeve 39, a circumferential component force relative to the rocker arm 03 is generated due to the action of the wedge-shaped surface, so that the rocker arm 03 generates a rotating moment, the rocker arm 03 rotates anticlockwise by taking the support shaft 51 as an axis, when the rocker arm 03 rotates under the action of the wedge-shaped surface 21, the torsion spring 04 twists along with the rocker arm 03 and stores elastic potential energy due to torsion, when the punch 01 moves up, the torsion spring 04 releases the elastic potential energy to force the rocker arm 03 to rotate clockwise, so that a material tray 09 connected with the rocker arm 03 rotates anticlockwise above the waste collecting tank 07 when the wedge-shaped surface 21 moves down, when the wedge-shaped surface 21 moves up, the material tray 09 leaves the rocker arm 03, the material tray 09 rotates clockwise below the punch 01, the material tray 09 stays at the lower part of the punch 01, and the rising and falling, namely, the charging tray 09 reaches the lower part of the punch 01 before blanking, waits for receiving materials, then the waste materials are pushed down by the punch 01 and just fall into the hopper 93 of the charging tray 09, when the punch 01 descends, the waste materials are quickly rotated to the position above the waste material collecting groove 07 without influencing the blanking work, when the punch 01 descends, the charging tray 09 can be rotated to the position above the waste material collecting groove 07, when the waste material collecting groove 07 is approached, the pushing wedge surface 61 can generate a pushing force below the charging tray 09, so that the charging tray 09 is lifted around the hinge to generate a slope, the charging tray 09 gradually ascends along the slope to form buffering, the danger of flying out of the waste materials caused by rigid impact is avoided, meanwhile, the charging tray 09 is prevented from being blocked, products can slide down to the chute 71 of the waste material collecting groove 07 from the charging tray outlet 91 of the charging tray 09 along the slope, the products are safe, and then, the middle part of the rocker arm 03 is provided with a material receiving and grabbing groove 38 to provide a sliding space for the material ejecting wedge-shaped surface 61, and when the material ejecting wedge-shaped surface 61 starts ejecting, the material receiving and grabbing groove 38 is jacked up by passing through the material receiving and grabbing groove 38.
Claims (2)
1. A computer case stamping waste recovery device is characterized by comprising a punch, a pressing plate, a rocker arm, a torsional spring, a support, a material ejection column, a waste collection tank, a workbench, a material tray and a machine tool, wherein the machine tool is provided with the workbench, the right side of the workbench is fixedly connected with the support, a support shaft is arranged in the middle of the support, the rocker arm is arranged outside the support shaft, a rocker arm hole is formed in the middle of the rocker arm, the support shaft is rotatably connected with the rocker arm hole, the rocker arm rotates on the support, the outer side of the rocker arm is connected with the torsional spring, the torsional spring is sleeved outside the rocker arm, the upper portion of the rocker arm is provided with an upper fixing claw, the lower portion of the rocker arm is provided with a lower fixing claw, the upper fixing claw is fixed on the connecting arm, the lower fixing claw is fixed on the support, the upper portion of the rocker arm and the connecting arm are, the pressure bar sleeve is contacted with the wedge-shaped surface, the pressure plate is fixedly connected with the punch, the punch is connected with the machine tool, the left side of the rocker arm is provided with a connecting arm, the left side of the connecting arm is provided with a material receiving frame, the middle of the material receiving frame is provided with a material receiving grabbing groove, the left side of the material receiving frame is provided with a material rack chain seat, the right side of the material receiving frame is provided with a material tray support, the upper part of the material rack chain seat is provided with a material tray hinged support, the material tray hinged support can rotate around the material rack chain seat, the right side of the material tray is placed on the material tray support and used for enabling the material tray to be in a horizontal state, the middle of the material tray is provided with a material hopper, the front side of the material tray is provided with a material tray outlet, the front side of the workbench is provided with.
2. The operation method of the computer case punching waste recycling device according to claim 1, comprising the steps of:
the first step is as follows: when the punch moves downwards, the pressing plate moves downwards along with the punch, the pressing plate drives the wedge-shaped surface to downwards press the pressing rod sleeve together when moving downwards, so that the rocker arm generates a rotating moment, the rocker arm can rotate anticlockwise by taking the support shaft as an axis, when the rocker arm rotates under the action of the wedge-shaped surface, the torsion spring can be twisted along with the rocker arm, and thus a material tray connected with the rocker arm rotates anticlockwise above the waste collecting tank when moving downwards on the wedge-shaped surface;
the second step is that: when the material is close to the waste collecting tank, the ejecting wedge-shaped surface generates an ejecting force under the material tray, so that the material tray is lifted around the hinge to generate a gradient, the product can slide down to a chute of the waste collecting tank from a material tray outlet of the material tray along the gradient and slide down to the waste collecting device in the chute,
the third step: when the punch moves upwards and the wedge-shaped surface moves upwards, the torsion spring releases elastic potential energy to force the rocker arm to rotate clockwise, the material tray reaches the lower part of the punch before blanking after blanking, waiting for material receiving is carried out, and then the waste material is ejected by the punch and just falls into a hopper of the material tray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011146134.6A CN112222316B (en) | 2020-10-23 | 2020-10-23 | Computer case stamping waste recovery device and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011146134.6A CN112222316B (en) | 2020-10-23 | 2020-10-23 | Computer case stamping waste recovery device and operation method |
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| Publication Number | Publication Date |
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| CN112222316A true CN112222316A (en) | 2021-01-15 |
| CN112222316B CN112222316B (en) | 2022-05-13 |
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| CN202011146134.6A Active CN112222316B (en) | 2020-10-23 | 2020-10-23 | Computer case stamping waste recovery device and operation method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09122793A (en) * | 1995-11-06 | 1997-05-13 | Kanto Auto Works Ltd | Scrap discharging device in press die |
| CN102151762A (en) * | 2010-11-16 | 2011-08-17 | 奇瑞汽车股份有限公司 | Scrap chute mechanism |
| CN205436878U (en) * | 2016-03-25 | 2016-08-10 | 苏州巨人动力链条有限公司 | Press |
| CN209250443U (en) * | 2018-12-26 | 2019-08-13 | 无锡新瑞驰科技有限公司 | A kind of stamping equipment for rotor piece |
| CN210387143U (en) * | 2019-06-13 | 2020-04-24 | 苏州浩晶辉纺机配件有限公司 | Network nozzle connecting block processing device |
| CN111360139A (en) * | 2020-03-30 | 2020-07-03 | 刘先平 | Condenser fin manufacturing system |
| CN211191676U (en) * | 2019-11-29 | 2020-08-07 | 昆山湘保俊精密机械有限公司 | Automatic drawing of patterns press die utensil |
-
2020
- 2020-10-23 CN CN202011146134.6A patent/CN112222316B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09122793A (en) * | 1995-11-06 | 1997-05-13 | Kanto Auto Works Ltd | Scrap discharging device in press die |
| CN102151762A (en) * | 2010-11-16 | 2011-08-17 | 奇瑞汽车股份有限公司 | Scrap chute mechanism |
| CN205436878U (en) * | 2016-03-25 | 2016-08-10 | 苏州巨人动力链条有限公司 | Press |
| CN209250443U (en) * | 2018-12-26 | 2019-08-13 | 无锡新瑞驰科技有限公司 | A kind of stamping equipment for rotor piece |
| CN210387143U (en) * | 2019-06-13 | 2020-04-24 | 苏州浩晶辉纺机配件有限公司 | Network nozzle connecting block processing device |
| CN211191676U (en) * | 2019-11-29 | 2020-08-07 | 昆山湘保俊精密机械有限公司 | Automatic drawing of patterns press die utensil |
| CN111360139A (en) * | 2020-03-30 | 2020-07-03 | 刘先平 | Condenser fin manufacturing system |
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|---|---|
| CN112222316B (en) | 2022-05-13 |
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Application publication date: 20210115 Assignee: Chongqing Jintai Education Technology Co.,Ltd. Assignor: CHONGQING CHEMICAL INDUSTRY VOCATIONAL College Contract record no.: X2023980036673 Denomination of invention: Computer chassis stamping waste recycling device and operation method Granted publication date: 20220513 License type: Common License Record date: 20230616 |