CN212205705U - Production of rock wool board is with dissolving system stove - Google Patents

Production of rock wool board is with dissolving system stove Download PDF

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Publication number
CN212205705U
CN212205705U CN202021037197.3U CN202021037197U CN212205705U CN 212205705 U CN212205705 U CN 212205705U CN 202021037197 U CN202021037197 U CN 202021037197U CN 212205705 U CN212205705 U CN 212205705U
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CN
China
Prior art keywords
box
rock wool
side wall
communicated
melting furnace
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Expired - Fee Related
Application number
CN202021037197.3U
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Chinese (zh)
Inventor
王友金
王连成
曹金杰
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Tangshan Dinghui Technology Co ltd
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Tangshan Dinghui Technology Co ltd
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Priority to CN202021037197.3U priority Critical patent/CN212205705U/en
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Publication of CN212205705U publication Critical patent/CN212205705U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to the technical field of auxiliary devices for producing and processing rock wool boards, in particular to a melting furnace for producing rock wool boards, which can remove dust attached to the lower surface of a dust removal net in time during the working process and effectively reduce the influence on the filtering efficiency of the dust removal net; the melting furnace comprises a bottom plate, a melting furnace body, a box body and a dust removal net, wherein four groups of supporting legs are arranged at the bottom end of the bottom plate, a smoke exhaust pipe is communicated with the top end of the melting furnace body, a box opening is formed in the top end of the box body, a box cover is detachably arranged at the box opening, the output end of the smoke exhaust pipe is communicated with a hose, and the output end of the hose is communicated with a branch pipe; still include dust excluding hopper, left fixed plate, right fixed plate, two sets of left extension boards, two sets of right extension boards, two sets of left springs, two sets of right springs and collecting box, the regional intercommunication in dust excluding hopper bottom central authorities is provided with the discharging pipe, and the regional left half region in dust excluding hopper bottom is provided with left vibrating motor and right vibrating motor respectively with half regional right.

Description

Production of rock wool board is with dissolving system stove
Technical Field
The utility model relates to a rock wool board production processing auxiliary device's technical field especially relates to a rock wool board production is with dissolving stove.
Background
As is well known, a melting furnace for producing rock wool boards is an auxiliary device for melting and processing raw materials in the production process of rock wool boards, and is widely used in the field of production and processing of rock wool boards; the existing dissolving furnace for producing rock wool boards comprises a bottom plate, a dissolving furnace body, a box body and a dust removal net, wherein four groups of supporting legs are arranged at the bottom end of the bottom plate, the bottom end of the dissolving furnace body is connected with the left half area at the top end of the bottom plate, a smoke discharge pipe is communicated with the top end of the dissolving furnace body, the bottom end of the box body is connected with the right half area at the top end of the bottom plate, a working cavity is arranged in the box body, a box opening is arranged at the top end of the box body, the box opening is communicated with the working cavity, a box cover is detachably arranged at the box opening, a smoke outlet is arranged in the central area at the top end of the box cover, the smoke outlet is communicated with the working cavity, the dust removal net is transversely arranged in the upper half area in the working cavity, a connecting hole is transversely arranged in the central area of the left side wall, the output end of the hose is communicated with a branch pipe, the output end of the bottom of the branch pipe penetrates through the fixing hole and is fixedly connected with the inner side wall of the fixing hole, the lower half area of the right side wall of the box body is provided with an impurity discharging port, the impurity discharging port is communicated with the working cavity, and a baffle is detachably arranged at the impurity discharging port; when the existing dissolving furnace for producing rock wool boards is used, smoke generated by the operation of a dissolving furnace body enters a working cavity through a smoke exhaust pipe, a hose and a branch pipe, the smoke enters the upper half area of a filter screen in the working cavity after being filtered by a dust removal net, and the smoke after dust removal is discharged from a smoke outlet; the existing dissolving furnace for producing rock wool boards is found that a dust removal net is statically arranged, and after long-time work, a large amount of dust is easily attached to the lower surface of the dust removal net, so that the filtering efficiency of the dust removal net is easily influenced, and the use reliability of the dust removal net is poor.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a can in time get rid of the dust that will adhere to under the dust removal net on the surface in the course of the work, effectual reduction is to dust removal net filtration efficiency's influence, improves the rock wool board production of using the reliability with dissolving the stove.
The utility model discloses a rock wool board production is with dissolving system stove, comprising a base plate, dissolve system stove body, box and dust removal net, the bottom plate bottom is provided with four groups of landing legs, dissolve system stove body bottom and bottom plate top left half regional connection, dissolve system stove body top intercommunication and be provided with the pipe of discharging fume, the box bottom is connected with bottom plate top right half regional connection, the box is inside to be provided with the working chamber, the box top is provided with the case mouth, the case mouth communicates with the working chamber, and can dismantle at case mouth department and be provided with the case lid, case lid top central zone is provided with the outlet flue, the outlet flue communicates with the working chamber, box left side wall central zone transversely is provided with the connecting hole, the pipe output end of discharging fume passes through the connecting hole and stretches into the working chamber, the pipe is connected with the inside wall sealing of connecting hole, dust removal net top central zone vertically is provided with the fixed orifices, the output end of the bottom of the branch pipe penetrates through the fixing hole and is fixedly connected with the inner side wall of the fixing hole, the lower half area of the right side wall of the box body is provided with a trash discharging port, the trash discharging port is communicated with the working cavity, and a baffle is detachably arranged at the trash discharging port; the dust removing device also comprises a dust removing hopper, a left fixing plate, a right fixing plate, two groups of left supporting plates, two groups of right supporting plates, two groups of left springs, two groups of right springs and a collecting box, wherein an inner cavity is arranged in the dust removing hopper, the inner diameter of the lower half area of the dust removing hopper is sequentially reduced from top to bottom, an opening is formed in the top end of the dust removing hopper and communicated with the inner cavity, a dust removing net is transversely arranged in the upper half area of the inner cavity, a discharging pipe is arranged in the central area of the bottom end of the dust removing hopper in a communicating manner, the left end of the left fixing plate and the right end of the right fixing plate are respectively connected with the central area of the left side wall and the central area of the inner right side wall in the box body, the top ends of the two groups of left supporting plates are respectively connected with the left front side and the left back side of the bottom end of the dust removing hopper, the top, two sets of right spring tops respectively with two sets of right extension board bottom central zone territories be connected, two sets of right spring bottoms respectively with fixed plate top first half region and latter half regional connection, the dust removal fill bottom left half region and right half region are provided with left vibrating motor and right vibrating motor respectively, the inside chamber of placing that is provided with of collecting box, the collecting box top is provided with the feed inlet, the feed inlet with place the chamber intercommunication, the collecting box bottom contacts with the box inner bottom lateral wall.
The utility model discloses a production of rock wool board is with dissolving system stove still includes left anchor strut and right anchor strut, left side anchor strut and right anchor strut top are connected with left fixed plate and right fixed plate bottom central authorities region respectively, and left anchor strut and right anchor strut bottom are connected with box inner left side wall and interior right side wall second region respectively.
The utility model discloses a production of rock wool board is with dissolving system stove still includes left hand handle and right hand handle, left hand handle and right hand handle bottom respectively with half regional and half regional connection on the right side in the left side in case lid top, left hand handle and right hand handle lateral wall central zone do not are provided with left slipmat and right slipmat.
The utility model discloses a production of rock wool board is with dissolving stove still includes left handle and right handle, left side handle right-hand member and right handle left end respectively with collecting box left side wall and right side wall first region connection.
The utility model discloses a production of rock wool board is with dissolving stove still includes the accessory plate, the accessory plate transverse installation is between four group's landing legs.
The utility model discloses a production of rock wool board is with dissolving system stove still includes the pull ring, the pull ring left end is connected with baffle right side wall central zone.
The utility model discloses a production of rock wool board is with dissolving system stove, the lower region of lateral wall is provided with the observation hole before the box to be provided with the transparent plate in observation hole department.
The utility model discloses a production of rock wool board is with dissolving system stove, four group's landing leg bottoms all are provided with the silence pad.
Compared with the prior art, the beneficial effects of the utility model are that: the smoke generated by the operation of the melting furnace body enters the working cavity through the smoke exhaust pipe, the hose and the branch pipe, the smoke enters the upper half area of the filter screen in the working cavity after being filtered by the dust removal net, the smoke after dust removal is discharged from the smoke outlet, the left vibration motor and the right vibration motor are electrified in the process, the dust removal hopper is elastically supported through the two groups of left springs and the two groups of right springs, so that the left vibration motor and the right vibration motor jointly drive the dust removal hopper to vibrate, in the vibrating process of the dust removal hopper, the dust attached to the lower surface of the dust removal net falls off from the dust removal net and then falls into the placing cavity through the discharge pipe, the dust is collected through the collection box, the baffle is opened, the collection box can be pulled out of the working cavity, the dust can be further processed, the dust attached to the lower surface of the dust removal net can be timely removed in the working process, and the influence on the filtering efficiency of the, the use reliability is improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is an enlarged view of a portion B of FIG. 1;
FIG. 4 is a schematic view showing the connection between the case and the transparent plate;
in the drawings, the reference numbers: 1. a base plate; 2. a melting furnace body; 3. a box body; 4. a dust removal net; 5. a support leg; 6. a smoke exhaust pipe; 7. a box cover; 8. a smoke outlet; 9. a hose; 10. a branch pipe; 11. a baffle plate; 12. a dust removal hopper; 13. a left fixing plate; 14. a right fixing plate; 15. a left support plate; 16. a right support plate; 17. a left spring; 18. a right spring; 19. a collection box; 20. a discharge pipe; 21. a left vibration motor; 22. a right vibration motor; 23. a left reinforcement bar; 24. a right reinforcing rod; 25. a left handle; 26. a right handle; 27. a left non-slip mat; 28. a right anti-skid pad; 29. a left handle; 30. a right handle; 31. an auxiliary plate; 32. a pull ring; 33. a transparent plate; 34. a mute pad.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
As shown in figures 1 to 4, the melting furnace for producing rock wool boards of the utility model comprises a bottom plate 1, a melting furnace body 2, a box body 3 and a dust removing net 4, wherein the bottom end of the bottom plate 1 is provided with four groups of supporting legs 5, the bottom end of the melting furnace body 2 is connected with the left half area of the top end of the bottom plate 1, the top end of the melting furnace body 2 is communicated with a smoke exhaust pipe 6, the bottom end of the box body 3 is connected with the right half area of the top end of the bottom plate 1, a working cavity is arranged inside the box body 3, the top end of the box body 3 is provided with a box opening, the box opening is communicated with the working cavity, a box cover 7 is detachably arranged at the box opening, the central area of the top end of the box cover 7 is provided with a smoke outlet 8, the smoke outlet 8 is communicated with the working cavity, the central area of the left side wall of the box body 3 is transversely provided with a connecting hole, the output end of the smoke exhaust pipe 6 is communicated with a hose 9, the output end of the hose 9 is communicated with a branch pipe 10, the output end of the bottom of the branch pipe 10 penetrates through the fixed hole and is fixedly connected with the inner side wall of the fixed hole, the lower half area of the right side wall of the box body 3 is provided with a trash discharge port, the trash discharge port is communicated with the working cavity, and a baffle plate 11 is detachably arranged at the trash discharge port; the dust removing device also comprises a dust removing bucket 12, a left fixing plate 13, a right fixing plate 14, two groups of left support plates 15, two groups of right support plates 16, two groups of left springs 17, two groups of right springs 18 and a collecting box 19, wherein an inner cavity is arranged in the dust removing bucket 12, the inner diameter of the lower half area of the dust removing bucket 12 is sequentially reduced from top to bottom, an opening is arranged at the top end of the dust removing bucket 12 and communicated with the inner cavity, a dust removing net 4 is transversely arranged in the upper half area of the inner cavity, a discharging pipe 20 is communicated with the central area at the bottom end of the dust removing bucket 12, the left end of the left fixing plate 13 and the right end of the right fixing plate 14 are respectively connected with the central areas of the left side wall and the right side wall in the box body 3, the top ends of the two groups of left support plates 15 are respectively connected with the left front side and the left rear side at the bottom, the bottom ends of two groups of left springs 17 are respectively connected with the front half area and the rear half area of the top end of the left fixed plate 13, the top ends of two groups of right springs 18 are respectively connected with the central area of the bottom ends of two groups of right support plates 16, the bottom ends of two groups of right springs 18 are respectively connected with the front half area and the rear half area of the top end of the fixed plate, the left half area and the right half area of the bottom end of the dust removing hopper 12 are respectively provided with a left vibrating motor 21 and a right vibrating motor 22, a placing cavity is arranged in the collecting box 19, the top end of the collecting box 19 is provided with a feeding; the smoke generated by the operation of the melting furnace body enters the working cavity through the smoke exhaust pipe, the hose and the branch pipe, the smoke enters the upper half area of the filter screen in the working cavity after being filtered by the dust removal net, the smoke after dust removal is discharged from the smoke outlet, the left vibration motor and the right vibration motor are electrified in the process, the dust removal hopper is elastically supported through the two groups of left springs and the two groups of right springs, so that the left vibration motor and the right vibration motor jointly drive the dust removal hopper to vibrate, in the vibrating process of the dust removal hopper, the dust attached to the lower surface of the dust removal net falls off from the dust removal net and then falls into the placing cavity through the discharge pipe, the dust is collected through the collection box, the baffle is opened, the collection box can be pulled out of the working cavity, the dust can be further processed, the dust attached to the lower surface of the dust removal net can be timely removed in the working process, and the influence on the filtering efficiency of the, the use reliability is improved.
The melting furnace for rock wool board production of the utility model also comprises a left reinforcing rod 23 and a right reinforcing rod 24, the top ends of the left reinforcing rod 23 and the right reinforcing rod 24 are respectively connected with the central areas of the bottom ends of the left fixing plate 13 and the right fixing plate 14, and the bottom ends of the left reinforcing rod 23 and the right reinforcing rod 24 are respectively connected with the lower half areas of the left side wall and the right side wall in the box body 3; left side stiffening rod and right stiffening rod can support left fixed plate and right fixed plate respectively, improve the stability in use.
The melting furnace for rock wool board production of the utility model also comprises a left handle 25 and a right handle 26, the bottom ends of the left handle 25 and the right handle 26 are respectively connected with the left half area and the right half area of the top end of the box cover 7, and the central areas of the outer side walls of the left handle 25 and the right handle 26 are respectively provided with a left non-slip mat 27 and a right non-slip mat 28; the left handle and the right handle can facilitate the opening and closing of the box cover, and the use convenience is improved.
The melting furnace for rock wool board production of the utility model also comprises a left handle 29 and a right handle 30, wherein the right end of the left handle 29 and the left end of the right handle 30 are respectively connected with the upper half area of the left side wall and the upper half area of the right side wall of the collecting box 19; left handle and right handle can be convenient for the staff and remove the collecting box, improve and use the flexibility.
The melting furnace for producing the rock wool board of the utility model also comprises an auxiliary board 31, wherein the auxiliary board 31 is transversely arranged among the four groups of supporting legs 5; the auxiliary plate can support four groups of supporting legs, and the use stability is improved.
The melting furnace for producing the rock wool board of the utility model also comprises a pull ring 32, wherein the left end of the pull ring 32 is connected with the central area of the right side wall of the baffle 11; the pull ring can facilitate the opening and closing of the baffle plate, and the use convenience is improved.
The utility model discloses a melting furnace for producing rock wool boards, the lower half area of the front side wall of a box body 3 is provided with an observation hole, and a transparent plate 33 is arranged at the observation hole; the transparent plate can be convenient for the staff to observe in the work chamber, improves and uses the controllability.
In the melting furnace for producing the rock wool boards, the bottom ends of the four groups of supporting legs 5 are provided with the silencing pads 34; the silencing pad can play a silencing role in the device, and the use stability is improved.
The utility model discloses a dissolving furnace for rock wool board production, when it works, the flue gas produced by the dissolving furnace body enters into the working cavity through the smoke exhaust pipe, the hose and the branch pipe, the flue gas enters into the first half area of the filter screen in the working cavity after being filtered by the dust removal net, the flue gas after dust removal is discharged from the smoke outlet, the left vibration motor and the right vibration motor are electrified in the process, because the dust removal bucket is elastically supported by two groups of left springs and two groups of right springs, the left vibration motor and the right vibration motor drive the dust removal bucket to vibrate together, in the process of the dust removal bucket vibration, the dust attached on the lower surface of the dust removal net falls from the dust removal net, then falls into the placing cavity through the discharge pipe, the dust is collected through the collection box, the baffle is opened, the collection box can be pulled out from the working cavity, the dust can be further processed, the dust can be removed in time in the working process, the influence on the filtering efficiency of the dust removal net is effectively reduced, and the use reliability is improved; the left reinforcing rod and the right reinforcing rod can respectively support the left fixing plate and the right fixing plate, so that the use stability is improved; the left handle and the right handle can facilitate the opening and closing of the box cover, so that the use convenience is improved; the left handle and the right handle can facilitate workers to move the collecting box, so that the use flexibility is improved; the auxiliary plate can support the four groups of supporting legs, so that the use stability is improved; the pull ring can facilitate the opening and closing of the baffle plate, and the use convenience is improved; the transparent plate can facilitate the staff to observe the working cavity, so that the use controllability is improved; the silencing pad can play a silencing role in the device, and the use stability is improved.
The utility model discloses a rock wool board production is with dissolving left vibrating motor and right vibrating motor that system stove used all purchase from the market, only need according to the description install use can.
The utility model discloses a production of rock wool board is with dissolving system stove, above the mounting means, the connected mode or the mode that sets up of all parts are common mechanical system to concrete structure, model and the coefficient index of its all parts are its from taking the technique, as long as can reach all can implement of its beneficial effect, so do not add at much and give unnecessary details.
The melting furnace for producing rock wool boards of the utility model, under the condition of not explaining the contrary, the orientation words contained in the terms of 'up-down, left-right, front-back, inside-outside, vertical and horizontal' and the like only represent the orientation of the term in the normal use state, or be a trivial term understood by those skilled in the art, and should not be considered as limiting the term, at the same time, the numerical terms "first," "second," and "third," etc. do not denote any particular quantity or order, but rather are used to distinguish one from another, furthermore, 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 also includes other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A dissolving furnace for rock wool board production comprises a bottom plate (1), a dissolving furnace body (2), a box body (3) and a dust removal net (4), wherein four groups of supporting legs (5) are arranged at the bottom end of the bottom plate (1), the bottom end of the dissolving furnace body (2) is connected with the left half area of the top end of the bottom plate (1), a smoke exhaust pipe (6) is communicated with the top end of the dissolving furnace body (2), the bottom end of the box body (3) is connected with the right half area of the top end of the bottom plate (1), a working cavity is arranged in the box body (3), a box opening is formed in the top end of the box body (3), the box opening is communicated with the working cavity, a box cover (7) is detachably arranged at the box opening, a smoke outlet (8) is formed in the central area of the top end of the box cover (7), the smoke outlet (8) is communicated with the working cavity, a connecting hole is transversely formed in the, the smoke exhaust pipe (6) is hermetically connected with the inner side wall of the connecting hole, a fixed hole is longitudinally formed in the central area of the top end of the dust removal net (4), the output end of the smoke exhaust pipe (6) is communicated with a hose (9), the output end of the hose (9) is communicated with a branch pipe (10), the output end of the bottom of the branch pipe (10) penetrates through the fixed hole and is fixedly connected with the inner side wall of the fixed hole, the lower half area of the right side wall of the box body (3) is provided with an impurity discharge port, the impurity discharge port is communicated with the working cavity, and a baffle (11; the dust removing device is characterized by further comprising a dust removing hopper (12), a left fixing plate (13), a right fixing plate (14), two groups of left support plates (15), two groups of right support plates (16), two groups of left springs (17), two groups of right springs (18) and a collecting box (19), wherein an inner cavity is formed in the dust removing hopper (12), the inner diameter of the lower half area of the dust removing hopper (12) is sequentially reduced from top to bottom, an opening is formed in the top end of the dust removing hopper (12) and communicated with the inner cavity, a dust removing net (4) is transversely arranged in the upper half area of the inner cavity, a discharging pipe (20) is communicated with the central area of the bottom end of the dust removing hopper (12), the left end of the left fixing plate (13) and the right end of the right fixing plate (14) are respectively connected with the central area of the inner left side wall and the inner right side wall of the box body (3), the top ends of the two groups of the left support plates (15) are respectively connected with the left front side and the, two sets of left spring (17) tops respectively with two sets of left extension board (15) bottom central authorities regional connection, two sets of left spring (17) bottoms respectively with left fixed plate (13) top first half regional and latter half regional connection, two sets of right spring (18) tops respectively with two sets of right extension board (16) bottom central authorities regional connection, two sets of right spring (18) bottoms respectively with fixed plate top first half regional and latter half regional connection, dust hopper (12) bottom left half regional and right half regional left vibrating motor (21) and right vibrating motor (22) of being provided with respectively, collecting box (19) inside is provided with places the chamber, and collecting box (19) top is provided with the feed inlet, feed inlet and the chamber intercommunication of placing, collecting box (19) bottom and box (3) inner bottom lateral wall contact.
2. The melting furnace for producing rock wool boards as claimed in claim 1, further comprising a left reinforcing rod (23) and a right reinforcing rod (24), wherein the top ends of the left reinforcing rod (23) and the right reinforcing rod (24) are respectively connected with the central areas of the bottom ends of the left fixing plate (13) and the right fixing plate (14), and the bottom ends of the left reinforcing rod (23) and the right reinforcing rod (24) are respectively connected with the lower half areas of the inner left side wall and the inner right side wall of the box body (3).
3. The melting furnace for producing rock wool boards as claimed in claim 2, further comprising a left handle (25) and a right handle (26), wherein the bottom ends of the left handle (25) and the right handle (26) are respectively connected with the left half area and the right half area of the top end of the box cover (7), and the central areas of the outer side walls of the left handle (25) and the right handle (26) are respectively provided with a left non-slip mat (27) and a right non-slip mat (28).
4. The melting furnace for rock wool board production as claimed in claim 3, further comprising a left handle (29) and a right handle (30), wherein the right end of the left handle (29) and the left end of the right handle (30) are respectively connected with the upper half areas of the left side wall and the right side wall of the collecting box (19).
5. A melting furnace for producing rock wool panels as claimed in claim 4, further comprising an auxiliary plate (31), said auxiliary plate (31) being mounted transversely between the four sets of legs (5).
6. The melting furnace for producing rock wool panels as claimed in claim 5, further comprising a pull ring (32), wherein the left end of the pull ring (32) is connected with the central region of the right side wall of the baffle plate (11).
7. The melting furnace for producing rock wool boards as claimed in claim 6, wherein the lower half area of the front side wall of the box body (3) is provided with an observation hole, and a transparent plate (33) is arranged at the observation hole.
8. The melting furnace for producing rock wool panels as claimed in claim 7, wherein the bottom ends of the four sets of legs (5) are provided with a silencing pad (34).
CN202021037197.3U 2020-06-08 2020-06-08 Production of rock wool board is with dissolving system stove Expired - Fee Related CN212205705U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021037197.3U CN212205705U (en) 2020-06-08 2020-06-08 Production of rock wool board is with dissolving system stove

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021037197.3U CN212205705U (en) 2020-06-08 2020-06-08 Production of rock wool board is with dissolving system stove

Publications (1)

Publication Number Publication Date
CN212205705U true CN212205705U (en) 2020-12-22

Family

ID=73808958

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021037197.3U Expired - Fee Related CN212205705U (en) 2020-06-08 2020-06-08 Production of rock wool board is with dissolving system stove

Country Status (1)

Country Link
CN (1) CN212205705U (en)

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Granted publication date: 20201222