CN112008926A - Discharging device of polyurethane casting machine - Google Patents
Discharging device of polyurethane casting machine Download PDFInfo
- Publication number
- CN112008926A CN112008926A CN202010609794.7A CN202010609794A CN112008926A CN 112008926 A CN112008926 A CN 112008926A CN 202010609794 A CN202010609794 A CN 202010609794A CN 112008926 A CN112008926 A CN 112008926A
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- CN
- China
- Prior art keywords
- discharging
- driving
- pipe
- limiting
- rod
- Prior art date
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
- B29B7/16—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with paddles or arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/26—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention relates to the technical field of polyurethane casting machine accessories and discloses a discharging device of a polyurethane casting machine, which comprises a reaction kettle, wherein a horizontally arranged discharging pipe is communicated on the side wall of the reaction kettle close to the bottom through an obliquely arranged material guide pipe, the discharging pipe is fixedly connected to the outer bottom of the reaction kettle, and a discharging mechanism is connected in the discharging pipe; the discharging mechanism comprises a speed reducing motor, a driving disc, a driving column, a driving frame, a transmission rod and a discharging column, the discharging tube is of an open-ended structure, the discharging column is slidably connected to the inner tube wall of the discharging tube, the discharging column is arranged under the discharging end of the material guide tube, the speed reducing motor is fixedly connected to the inner tube wall of the discharging tube close to the bottom of the tube, and the output end of the speed reducing motor is connected with the driving disc through a coupler. According to the invention, the material guide pipe is periodically extruded when the material is discharged into the material discharge pipe, so that the material in the material discharge pipe is prevented from being blocked in the material discharge process, and the device is prevented from being damaged.
Description
Technical Field
The invention relates to the technical field of polyurethane casting machine accessories, in particular to a discharging device of a polyurethane casting machine.
Background
Polyurethane casting machine among the prior art is exported by the reation kettle who deposits polyurethane, then reachs the stirring intracavity and stirs, then the ejection of compact, and at the ejection of compact in-process, annotate in the discharging tube and expect to take place to block up easily to lead to the device to damage.
Disclosure of Invention
The invention aims to solve the problem that in the discharging process in the prior art, the device is damaged due to the fact that material is easily blocked in a discharging pipe in a pouring process, and provides a discharging device of a polyurethane pouring machine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a discharging device of a polyurethane casting machine comprises a reaction kettle, wherein a horizontally arranged discharging pipe is communicated with the side wall of the reaction kettle, which is close to the bottom, through an obliquely arranged material guide pipe, the discharging pipe is fixedly connected to the outer bottom of the reaction kettle, and a discharging mechanism is connected in the discharging pipe;
the discharging mechanism comprises a speed reducing motor, a driving disc, a driving column, a driving frame, a transmission rod and a discharging column, the discharge pipe is of a structure with an opening at one end, the discharge column is connected to the inner pipe wall of the discharge pipe in a sliding manner, the discharging column is arranged right below the discharging end of the material guiding pipe, the speed reducing motor is fixedly connected on the inner pipe wall of the discharging pipe close to the bottom of the pipe, the output end of the speed reducing motor is connected with the driving disc through the coupler, the driving column is fixedly connected at the edge of one end of the driving disc far away from the speed reducing motor, the driving frame is sleeved on the driving column, one end of the transmission rod is fixedly connected with the center of the discharging column close to one end of the speed reducing motor, the other end of the transmission rod is fixedly connected to the outer frame wall of the driving frame, and the rod wall of the transmission rod is connected with the inner pipe wall of the discharge pipe through two symmetrically-arranged limiting parts.
Preferably, annular drive groove has been seted up at reation kettle's interior top, fixedly connected with ring gear on the cell wall in drive groove, the tank bottom center department in drive groove has seted up the drive hole, reation kettle's outer top center department fixedly connected with driving motor, driving motor's output has the axis of rotation through the coupling joint, driving motor's one end is passed in the drive hole and extends to reation kettle in the axis of rotation is located the fixed cover along the even equidistance of vertical direction on the axle wall of axis of rotation has a plurality of stirring fan blade in the reation kettle, the meshing has the gear on the ring gear, the lower extreme fixedly connected with spiral leaf puddler of gear, the fixed cover of having connect the bearing on the pole wall of spiral leaf puddler, be connected through the gangbar between bearing and the axis of rotation.
Preferably, the limiting part comprises a limiting block and a limiting groove, the limiting block is fixedly connected to the rod wall of the transmission rod, the position of the limiting groove corresponding to the limiting block is arranged on the inner pipe wall of the discharge pipe along the horizontal linear direction, one end of the limiting block, which is far away from the transmission rod, extends into the limiting groove, and the limiting block is connected to the limiting groove in a sliding manner.
Preferably, the upper end fixedly connected with protection casing of reation kettle, driving motor sets up in the protection casing.
Preferably, the side wall of the reaction kettle is communicated with a feeding pipe.
Preferably, the limiting groove is fixedly connected with a limiting rod along the horizontal linear direction, a limiting hole matched with the limiting rod is formed in the position, corresponding to the limiting rod, of the limiting block, the limiting rod penetrates through the limiting hole, and the limiting block is connected to the limiting rod in a sliding mode.
Preferably, a rolling groove is formed in one end, far away from the transmission rod, of the limiting block, rolling balls are arranged in the rolling groove, the balls penetrate through notches of the rolling groove, and the balls are connected to the bottom of the limiting groove in a rolling mode.
Preferably, the feeding pipe is communicated with a feeding hopper.
Preferably, the ball has a ball diameter larger than a groove diameter of the rolling groove opening.
Compared with the prior art, the invention provides a discharging device of a polyurethane casting machine, which has the following beneficial effects:
this discharging device of polyurethane casting machine, through setting up gear motor, the driving-disc, the drive post, the drive frame, a discharge mechanism is constituteed to transfer line and ejection of compact post, start gear motor during the discharging pipe ejection of compact, gear motor drives the driving-disc and rotates, when the driving-disc itself drives the drive post and rotates, the drive frame that the cover was established on the drive post drives the transfer line and is reciprocating motion along with the rotation of drive post, and then drive the ejection of compact post and be reciprocating motion in the ejection of compact pipe, the notes material of putting into the ejection of compact pipe with the guide pipe row is periodic extrusion, prevent at ejection of compact in-process, annotate in the ejection of compact pipe and expect to take place to block up, prevent that the.
The parts which are not involved in the device are the same as or can be realized by the prior art, and the material guide pipe is used for periodically extruding the injected material which is discharged into the discharge pipe, so that the injected material in the discharge pipe is prevented from being blocked in the discharging process, and the device is prevented from being damaged.
Drawings
FIG. 1 is a schematic structural diagram of a discharging device of a polyurethane casting machine according to the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
fig. 4 is an enlarged view of a portion C in fig. 1.
In the figure: the device comprises a reaction kettle 1, a material guide pipe 2, a material discharge pipe 3, a speed reducing motor 4, a driving disc 5, a driving column 6, a driving frame 7, a transmission rod 8, a material discharge column 9, a driving groove 10, an inner gear ring 11, a driving hole 12, a driving motor 13, a rotating shaft 14, stirring fan blades 15, gears 16, a spiral blade stirring rod 17, a bearing 18, a linkage rod 19, a limiting block 20, a limiting groove 21, a protective cover 22, a material feeding pipe 23, a limiting rod 24, a rolling groove 25 and balls 26.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-4, a discharging device of a polyurethane casting machine comprises a reaction kettle 1, wherein a horizontally arranged discharging pipe 3 is communicated with the side wall of the reaction kettle 1 close to the bottom through an obliquely arranged material guiding pipe 2, the discharging pipe 3 is fixedly connected to the outer bottom of the reaction kettle 1, and a discharging mechanism is connected in the discharging pipe 3;
the discharging mechanism comprises a speed reducing motor 4, a driving disc 5, a driving column 6, a driving frame 7, a transmission rod 8 and a discharging column 9, the discharging pipe 3 is of a structure with an opening at one end, the discharging column 9 is connected to the inner pipe wall of the discharging pipe 3 in a sliding manner, the discharging column 9 is arranged right below the discharging end of the material guide pipe 2, the speed reducing motor 4 is fixedly connected to the inner pipe wall of the discharging pipe 3 close to the bottom of the pipe, the output end of the speed reducing motor 4 is connected with the driving disc 5 through a coupler, the driving column 6 is fixedly connected to the edge of the driving disc 5 far away from one end of the speed reducing motor 4, the driving frame 7 is sleeved on the driving column 6, one end of the transmission rod 8 is fixedly connected to the center of the discharging column 9 close to one end of the speed reducing motor 4, the other end of the transmission rod 8 is fixedly connected to the outer frame wall, starting gear motor 4 during the ejection of compact of discharging pipe 3, gear motor 4 drives driving-disc 5 and rotates, driving-disc 5 itself drives driving post 6 and rotates when, the drive frame 7 that the cover was established on the driving post 6 drives transfer line 8 along with the rotation of driving post 6 and is reciprocating motion, and then drive discharging post 9 and be reciprocating motion in discharging pipe 3, it is periodic extrusion to discharge the notes material of going into in discharging pipe 3 with passage 2, prevent at the ejection of compact in-process, the material takes place to block up in discharging pipe 3, prevent that the device from taking place to damage.
An annular driving groove 10 is formed in the inner top of a reaction kettle 1, an inner gear ring 11 is fixedly connected to the wall of the driving groove 10, a driving hole 12 is formed in the center of the bottom of the driving groove 10, a driving motor 13 is fixedly connected to the center of the outer top of the reaction kettle 1, the output end of the driving motor 13 is connected with a rotating shaft 14 through a coupling, one end of the rotating shaft 14, far away from the driving motor 13, penetrates through the driving hole 12 and extends into the reaction kettle 1, a plurality of stirring fan blades 15 are fixedly sleeved on the shaft wall of the rotating shaft 14 in the reaction kettle 1 at equal intervals along the vertical direction, a gear 16 is meshed with the inner gear ring 11, a spiral blade stirring rod 17 is fixedly connected to the lower end of the gear 16, a bearing 18 is fixedly sleeved on the rod wall of the spiral blade stirring rod 17, the bearing 18 is connected with the rotating shaft 14 through a linkage rod 19, the driving motor 13 is started, the material is injected into the reaction kettle 1 and is stirred, when the rotating shaft 14 rotates, the screw blade stirring rod 17 is driven by the linkage rod 19 and the bearing 18 to revolve around the rotating shaft 14, the screw blade stirring rod 17 drives the gear 16 to move on the internal gear ring 11 while revolving, so that the screw blade stirring rod 17 rotates in the bearing 18, the material injected into the reaction kettle 1 is fully stirred, and the reaction effect of the material injected into the reaction kettle 1 is improved.
The locating part includes stopper 20 and spacing groove 21, stopper 20 fixed connection is on the pole wall of transfer line 8, and the position that spacing groove 21 corresponds stopper 20 is seted up on the inner tube wall of discharging pipe 3 along horizontal linear direction, and stopper 20 keeps away from the one end of transfer line 8 and extends to in the spacing groove 21, and stopper 20 sliding connection is in spacing groove 21, drives stopper 20 synchronous motion in spacing groove 21 when transfer line 8 moves, carries on spacingly to the motion of transfer line 8.
The upper end fixedly connected with protection casing 22 of reation kettle 1, driving motor 13 sets up in protection casing 22, protects driving motor 13.
The side wall of the reaction kettle 1 is communicated with a feeding pipe 23, and the feeding pipe 23 feeds materials into the reaction kettle 1.
Limiting rod 24 is fixedly connected with along horizontal linear direction in limiting groove 21, stopper 20 correspond the position of limiting rod 24 and offered rather than assorted spacing hole, and limiting rod 24 passes spacing hole setting, and stopper 20 sliding connection prevents that stopper 20 from breaking away from limiting groove 21 on the limiting rod 24.
The rolling groove 25 has been seted up to stopper 20 one end of keeping away from transfer line 8, is equipped with rolling ball 26 in the rolling groove 25, and ball 26 passes the notch setting of rolling groove 25, and ball 26 roll connection is at the tank bottom of spacing groove 21, and the ball 26 that drives in the rolling groove 25 rolls when stopper 20 moves in spacing groove 21 for stopper 20 reduces frictional resistance when moving more stably in spacing groove 21.
The feed pipe 23 is communicated with a feed hopper, so that the feed in the feed pipe 23 can be supplemented conveniently.
The ball 26 has a larger spherical diameter than the groove diameter of the notch of the rolling groove 25, preventing the ball 26 from slipping out of the rolling groove 25.
According to the invention, when the discharging pipe 3 discharges materials, the speed reducing motor 4 is started, the speed reducing motor 4 drives the driving disc 5 to rotate, when the driving disc 5 drives the driving column 6 to rotate, the driving frame 7 sleeved on the driving column 6 drives the transmission rod 8 to reciprocate along with the rotation of the driving column 6, so that the discharging column 9 is driven to reciprocate in the discharging pipe 3, and the materials discharged into the discharging pipe 3 by the material guide pipe 2 are periodically extruded, so that the blockage of the materials in the discharging pipe 3 is prevented in the discharging process, and the damage of the device is prevented; the reaction kettle 1 starts the driving motor 13 when working, the driving motor 13 drives the rotating shaft 14 and the stirring fan blades 15 to rotate, the materials in the reaction kettle 1 are stirred, the rotating shaft 14 drives the spiral blade stirring rod 17 to revolve around the rotating shaft 14 through the linkage rod 19 and the bearing 18 when rotating, the spiral blade stirring rod 17 drives the gear 16 to move on the inner gear ring 11 when revolving, so that the spiral blade stirring rod 17 rotates in the bearing 18, the materials in the reaction kettle 1 are fully stirred, and the reaction effect of the materials in the reaction kettle 1 is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A discharging device of a polyurethane casting machine comprises a reaction kettle (1), and is characterized in that a discharging pipe (3) which is horizontally arranged is communicated on the side wall of the reaction kettle (1) close to the bottom through a material guide pipe (2) which is obliquely arranged, the discharging pipe (3) is fixedly connected to the outer bottom of the reaction kettle (1), and a discharging mechanism is connected in the discharging pipe (3);
the discharging mechanism comprises a speed reducing motor (4), a driving disc (5), a driving column (6), a driving frame (7), a transmission rod (8) and a discharging column (9), the discharging pipe (3) is of an open structure at one end, the discharging column (9) is connected to the inner pipe wall of the discharging pipe (3) in a sliding mode, the discharging column (9) is arranged under the discharging end of the material guide pipe (2), the speed reducing motor (4) is fixedly connected to the inner pipe wall of the discharging pipe (3) close to the bottom of the pipe, the output end of the speed reducing motor (4) is connected with the driving disc (5) through a coupler, the driving column (6) is fixedly connected to the edge of one end, far away from the speed reducing motor (4), of the driving disc (5), the driving frame (7) is sleeved on the driving column (6), one end of the transmission rod (8) is fixedly connected to the center of one end, close to the speed reducing motor (4), of the, the other end of the transmission rod (8) is fixedly connected to the outer frame wall of the driving frame (7), and the rod wall of the transmission rod (8) is connected with the inner pipe wall of the discharge pipe (3) through two symmetrically-arranged limiting parts.
2. The discharging device of the polyurethane casting machine according to claim 1, wherein an annular driving groove (10) is formed at the inner top of the reaction kettle (1), an inner gear ring (11) is fixedly connected to the wall of the driving groove (10), a driving hole (12) is formed at the center of the bottom of the driving groove (10), a driving motor (13) is fixedly connected to the center of the outer top of the reaction kettle (1), the output end of the driving motor (13) is connected with a rotating shaft (14) through a coupler, one end of the rotating shaft (14) far away from the driving motor (13) penetrates through the driving hole (12) and extends into the reaction kettle (1), a plurality of stirring fan blades (15) are fixedly sleeved on the shaft wall of the rotating shaft (14) in the reaction kettle (1) uniformly and equidistantly along the vertical direction, and a gear (16) is engaged with the inner gear ring (11), the lower end of the gear (16) is fixedly connected with a spiral blade stirring rod (17), a bearing (18) is fixedly sleeved on the rod wall of the spiral blade stirring rod (17), and the bearing (18) is connected with the rotating shaft (14) through a linkage rod (19).
3. The discharging device of a polyurethane casting machine according to claim 1, wherein the limiting member comprises a limiting block (20) and a limiting groove (21), the limiting block (20) is fixedly connected to the rod wall of the transmission rod (8), the limiting groove (21) is formed in the inner pipe wall of the discharging pipe (3) along a horizontal straight line direction corresponding to the position of the limiting block (20), one end of the limiting block (20) far away from the transmission rod (8) extends into the limiting groove (21), and the limiting block (20) is slidably connected in the limiting groove (21).
4. The discharging device of a polyurethane casting machine according to claim 2, wherein a protective cover (22) is fixedly connected to the upper end of the reaction kettle (1), and the driving motor (13) is arranged in the protective cover (22).
5. The discharging device of polyurethane casting machine according to claim 1, characterized in that the side wall of the reaction kettle (1) is connected with a feeding pipe (23).
6. The discharging device of a polyurethane casting machine according to claim 3, wherein a limiting rod (24) is fixedly connected in the limiting groove (21) along a horizontal straight line direction, a limiting hole matched with the limiting rod (24) is formed in the position, corresponding to the limiting rod (24), of the limiting block (20), the limiting rod (24) penetrates through the limiting hole, and the limiting block (20) is slidably connected to the limiting rod (24).
7. The discharging device of the polyurethane casting machine according to claim 3, wherein a rolling groove (25) is formed in one end of the limiting block (20) far away from the transmission rod (8), a rolling ball (26) is arranged in the rolling groove (25), the rolling ball (26) penetrates through a notch of the rolling groove (25), and the rolling ball (26) is connected to the bottom of the limiting groove (21) in a rolling manner.
8. The discharging device of polyurethane casting machine according to claim 5, characterized in that the feeding pipe (23) is connected with a feeding hopper.
9. The discharge device of a polyurethane casting machine according to claim 7, wherein the ball (26) has a larger diameter than the groove diameter of the opening of the rolling groove (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010609794.7A CN112008926A (en) | 2020-06-29 | 2020-06-29 | Discharging device of polyurethane casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010609794.7A CN112008926A (en) | 2020-06-29 | 2020-06-29 | Discharging device of polyurethane casting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112008926A true CN112008926A (en) | 2020-12-01 |
Family
ID=73498411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010609794.7A Withdrawn CN112008926A (en) | 2020-06-29 | 2020-06-29 | Discharging device of polyurethane casting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112008926A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112847998A (en) * | 2020-12-30 | 2021-05-28 | 贺盛精密塑胶(苏州)有限公司 | Pouring process of PU pouring wheel |
| CN113024967A (en) * | 2021-02-14 | 2021-06-25 | 施懿宸 | Preparation method of antibacterial polyvinyl chloride plastic |
| CN113374265A (en) * | 2021-05-02 | 2021-09-10 | 许立霞 | A concrete placement guider for restricted space |
-
2020
- 2020-06-29 CN CN202010609794.7A patent/CN112008926A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112847998A (en) * | 2020-12-30 | 2021-05-28 | 贺盛精密塑胶(苏州)有限公司 | Pouring process of PU pouring wheel |
| CN113024967A (en) * | 2021-02-14 | 2021-06-25 | 施懿宸 | Preparation method of antibacterial polyvinyl chloride plastic |
| CN113374265A (en) * | 2021-05-02 | 2021-09-10 | 许立霞 | A concrete placement guider for restricted space |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20201201 |
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| WW01 | Invention patent application withdrawn after publication |