CN113400202A - Sand blasting device for T-shaped iron surface of loudspeaker - Google Patents
Sand blasting device for T-shaped iron surface of loudspeaker Download PDFInfo
- Publication number
- CN113400202A CN113400202A CN202110843346.8A CN202110843346A CN113400202A CN 113400202 A CN113400202 A CN 113400202A CN 202110843346 A CN202110843346 A CN 202110843346A CN 113400202 A CN113400202 A CN 113400202A
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- CN
- China
- Prior art keywords
- sand blasting
- bevel gear
- circular motion
- spray head
- sand
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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
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Golf Clubs (AREA)
Abstract
The invention relates to a sand blasting device for the surface of a T iron of a loudspeaker, which comprises a mounting frame structure, a sand blasting device and a sand blasting device, wherein a spray head for performing sand blasting treatment on the T iron of the loudspeaker is movably arranged on the mounting frame structure; the lifting assembly is arranged on the mounting frame structure and connected with the spray head so as to drive the spray head to ascend or descend in the spatial vertical direction; the circular motion mechanism is connected with the lifting assembly, drives the spray head to do circular motion in the process that the lifting assembly drives the spray head to ascend or descend, and is arranged on the mounting frame structure; the sandblast subassembly, the sandblast unit mount is in on the lifting unit, the sandblast subassembly with the shower nozzle is connected and switches on, the sandblast subassembly is in the lifting unit drives the shower nozzle rises or the in-process that descends to the shower nozzle feed realizes even sandblast, reduces the manual operation volume.
Description
Technical Field
The invention relates to the field of processing of T-shaped iron of a loudspeaker, in particular to a sand blasting device for the surface of the T-shaped iron of the loudspeaker.
Background
Sandblasting is a process of cleaning and roughening the surface of a substrate by the impact action of a high-velocity stream of sand. Compressed air is used as power to form a high-speed spray beam to spray materials (copper ore sand, quartz sand, carborundum, iron sand and Hainan sand) to the surface of a workpiece to be treated at a high speed, so that the appearance or the shape of the outer surface of the workpiece is changed, and the surface of the workpiece obtains certain cleanliness and different roughness due to the impact and cutting action of an abrasive on the surface of the workpiece, so that the mechanical property of the surface of the workpiece is improved, the fatigue resistance of the workpiece is improved, the adhesive force between the workpiece and a coating is increased, the durability of a coating film is prolonged, and the leveling and decoration of a coating are facilitated.
In the production process of the T iron of the loudspeaker, sand blasting treatment needs to be carried out on the T iron, manual treatment is used in the traditional method, the sand blasting effect is poor, the working efficiency is low, and therefore the T iron surface sand blasting device for the loudspeaker is provided.
Disclosure of Invention
The invention aims to provide a sand blasting device for the surface of a T iron of a loudspeaker, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a speaker T iron surface blasting apparatus, the speaker T iron surface blasting apparatus comprising:
the mounting frame structure is movably provided with a spray head for performing sand blasting treatment on the T iron of the loudspeaker;
the lifting assembly is arranged on the mounting frame structure and connected with the spray head so as to drive the spray head to ascend or descend in the spatial vertical direction;
the circular motion mechanism is connected with the lifting assembly, drives the spray head to do circular motion in the process that the lifting assembly drives the spray head to ascend or descend, and is arranged on the mounting frame structure;
the sandblast subassembly, the sandblast unit mount is in on the lifting unit, the sandblast subassembly with the shower nozzle is connected and switches on, the sandblast subassembly is in the lifting unit drives the in-process that the shower nozzle rises or descends to the shower nozzle feed.
As a further scheme of the invention: the lifting assembly is connected with the sand blasting assembly through a transmission assembly, and the transmission assembly comprises a bevel gear set arranged on the lifting assembly and a first belt connected with the bevel gear set and the lifting assembly;
the bevel gear set comprises a first bevel gear rotatably mounted on the circular motion mechanism, a second bevel gear meshed with the first bevel gear and rotatably mounted on the lifting assembly, the second bevel gear is rotatably mounted on a turntable on the lifting assembly in a connected mode, and the turntable is connected with the sand blasting assembly through a second belt.
As a still further scheme of the invention: the mounting bracket structure includes the bottom plate that the level set up, through the riser with bottom plate parallel arrangement's mounting panel, the lower part of mounting panel is provided with the circular motion structure, the upper portion fixed mounting of bottom plate has the support, be provided with the permanent magnet on the support.
As a still further scheme of the invention: the lifting assembly comprises a power device fixedly installed on the circular motion mechanism, a lead screw connected with the power device and rotatably installed on the circular motion mechanism, a threaded sleeve in threaded fit with the lead screw, and a guide structure connected with the threaded sleeve and installed on the circular motion structure, the lead screw is connected with the bevel gear through the belt, and the spray head is fixedly installed on the threaded sleeve.
As a still further scheme of the invention: the guide structure comprises a guide plate fixedly mounted on the circular motion mechanism, a groove formed in the guide plate, one end of the groove is fixedly connected with the threaded sleeve, the other end of the groove is matched with the guide piece in a sliding mode, and the guide plate is rotatably mounted with the second-number bevel gear.
As a still further scheme of the invention: the circular motion mechanism comprises a fixed shaft fixedly arranged on the mounting plate, a movable rod rotatably arranged on the fixed shaft, and a meshing structure arranged on the movable rod and connected with the screw rod;
the power device is fixedly mounted on the movable rod, the screw rod is rotatably mounted on the movable rod, and the bevel gear is rotatably mounted on the movable rod.
As a still further scheme of the invention: the meshing structure comprises a first gear fixedly installed on the fixed shaft and far away from one end of the mounting plate, and a second gear meshed with the first gear and fixedly connected with the screw rod.
As a still further scheme of the invention: the sandblast subassembly includes fixed mounting and is in store up sand jar, fixed mounting on the deflector just pass through on the deflector No. two belts with the sand pump that the carousel is connected, the feed inlet and the sand storage tank of sand pump switch on, and the discharge gate of sand pump passes through the bellows and connects the shower nozzle.
Compared with the prior art, the invention has the beneficial effects that:
through setting up lifting unit and circular motion mechanism for the shower nozzle is when being circular motion, and is ascending or descend, carries out omnidirectional sand blasting to speaker T iron, and when the shower nozzle carries out the sandblast action, the sandblast subassembly is to in time the feed in the shower nozzle, and the practicality is strong.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a sand blasting device for a T-iron surface of a loudspeaker.
Fig. 2 is an enlarged view of a structure at a in fig. 1.
Fig. 3 is an enlarged view of the structure at B in fig. 1.
Fig. 4 is a schematic structural diagram of a mounting rack structure in an embodiment of a sand blasting device for a surface of a speaker T iron.
In the figure: 1-bottom plate, 2-vertical plate, 3-mounting plate, 4-dead axle, 5-movable rod, 6-power device, 7-first gear, 8-second gear, 9-first belt, 10-bevel gear set, 11-rotary table, 12-second belt, 13-sand pump, 14-sand storage tank, 15-guide plate, 16-lead screw, 17-threaded sleeve, 18-guide piece, 19-corrugated pipe, 20-spray head, 21-bearing piece, 22-permanent magnet and 23-groove.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Referring to fig. 1 to 4, in an embodiment of the present invention, a speaker T-iron surface sand blasting device includes:
the mounting frame structure is movably provided with a spray head 20 for carrying out sand blasting treatment on the T iron of the loudspeaker;
the lifting component is arranged on the mounting frame structure and is connected with the spray head 20 so as to drive the spray head 20 to ascend or descend in the spatial vertical direction;
the circular motion mechanism is connected with the lifting assembly, drives the spray head 20 to do circular motion in the process that the lifting assembly drives the spray head 20 to ascend or descend, and is arranged on the mounting frame structure;
the sandblast subassembly, the sandblast subassembly is installed on the lifting unit, the sandblast subassembly with shower nozzle 20 is connected and switches on, the sandblast subassembly is in the lifting unit drives shower nozzle 20 rises or the in-process that descends to shower nozzle 20 feed.
In the embodiment of the invention, the lifting assembly and the circular motion mechanism are arranged, so that the nozzle 20 can ascend or descend while making circular motion, the loudspeaker T iron can be subjected to omnibearing sand blasting treatment, and when the nozzle 20 performs sand blasting action, the sand blasting assembly supplies materials to the nozzle in time, and the practicability is high.
As an embodiment of the invention, the lifting assembly is connected with the sand blasting assembly through a transmission assembly, and the transmission assembly comprises a bevel gear set 10 mounted on the lifting assembly, and a first belt 9 connecting the bevel gear set 10 and the lifting assembly;
the bevel gear set 10 comprises a first bevel gear rotationally mounted on the circular motion mechanism, a second bevel gear meshed with the first bevel gear and rotationally mounted on the lifting assembly, the second bevel gear is connected and rotationally mounted on a rotary table 11 on the lifting assembly, and the rotary table 11 is connected with the sand blasting assembly through a second belt 12.
In the embodiment of the invention, when the lifting group works, the first bevel gear is driven to rotate by the first belt 9, so that the second bevel gear meshed with the first bevel gear rotates, the second belt 12 drives the sand blasting assembly to work, linkage is realized, and the integrity of the device is improved;
through setting up carousel 11, the realization is greater than the band pulley diameter of No. two belts 12 on the sandblast subassembly to the acceleration effect of sandblast subassembly, carousel 11's diameter promptly, avoids sandblast subassembly rotational speed too slow, influences the sandblast effect of shower nozzle 20.
As an embodiment of the present invention, the mounting bracket structure includes a bottom plate 1 horizontally disposed, and a mounting plate 3 disposed in parallel with the bottom plate 1 through a vertical plate 2, the lower portion of the mounting plate 3 is provided with the circular motion structure, the upper portion of the bottom plate 1 is fixedly mounted with a support 21, and the support 21 is provided with a permanent magnet 22.
In the embodiment of the invention, the base plate 1, the vertical plate 2 and the mounting plate 3 are fixedly connected through bolts, so that the stability of the device is improved, and meanwhile, the stability of the loudspeaker T iron on the base plate 1 is improved by arranging the supporting piece 21 and the permanent magnet 22, so that the loudspeaker T iron is prevented from moving when sand blasting operation is carried out.
As an embodiment of the present invention, the lifting assembly includes a power device 6 fixedly installed on the circular motion mechanism, a screw rod 16 connected with the power device 6 and rotatably installed on the circular motion mechanism, a threaded sleeve 17 in threaded fit with the screw rod 16, and a guide structure connected with the threaded sleeve 17 and installed on the circular motion mechanism, the screw rod 16 is connected with the first bevel gear through the first belt 9, and the spray head 20 is fixedly installed on the threaded sleeve 17.
In the embodiment of the invention, when the power device 6 rotates, the screw rod 16 is driven to rotate, so that the threaded sleeve 17 in threaded fit with the screw rod 16 ascends or descends in the axial direction of the screw rod 16 to drive the spray head 20 to ascend or descend, and meanwhile, the screw rod 16 drives the sand blasting assembly to work through the first belt 9 and the bevel gear set 10;
the power unit 6 is a servo motor having an output shaft that can rotate forward and backward.
As an embodiment of the present invention, the guiding structure includes a guiding plate 15 fixedly installed on the circular motion mechanism, a groove 23 formed on the guiding plate 15, and a guiding element 18 having one end fixedly connected to the threaded sleeve 17 and the other end slidably fitted to the groove 23, and the second-order bevel gear is rotatably installed on the guiding plate 15.
In the embodiment of the invention, when the threaded sleeve 17 ascends or descends in the axial direction of the screw rod 16, the guide piece 18 ascends or descends in the groove 23, and one end of the guide piece 18 is fixedly connected with the threaded sleeve 17, so that the threaded sleeve 17 cannot rotate along with the screw rod 16, the problem that the ascending and descending effect cannot be realized is avoided, meanwhile, the direction of the spray head 20 is always kept unchanged in the sand blasting process, and the sand blasting effect is ensured.
As an embodiment of the present invention, the circular motion mechanism includes a fixed shaft 4 fixedly installed on the mounting plate 3, a movable rod 5 rotatably installed on the fixed shaft 4, and a meshing structure installed on the movable rod 5 and connected to the screw rod 16;
the power device 6 is fixedly mounted on the movable rod 5, the screw rod 16 is rotatably mounted on the movable rod 5, and the first bevel gear is rotatably mounted on the movable rod 5.
In the embodiment of the invention, when the power device 6 works, the screw rod 16 is driven to rotate so as to drive the meshing structure to work, so that the movable rod 5 makes a circular motion along the axis of the fixed shaft 4;
it should be noted that the center of the support member 21 is on the same vertical line as the axis of the fixed shaft 4, and the axis of the speaker T iron is on the same vertical line as the axis of the fixed shaft 4 when the speaker T iron is installed.
As an embodiment of the present invention, the engaging structure includes a first gear 7 fixedly mounted on an end of the fixed shaft 4 away from the mounting plate 3, and a second gear 8 engaged with the first gear 7 and fixedly connected to the screw rod 16.
In the embodiment of the invention, when the screw rod 16 rotates, the second gear 8 is driven to rotate, and because the first gear 7 is relatively fixed, when the second gear 8 rotates, the movable rod 5 is driven to do circular motion, so that the spray head 20 does circular motion;
the diameter of the first gear 7 is larger than that of the second gear 8, so that the load of the power device 6 at the moment of starting is reduced, and meanwhile, the power device 6 only needs to output smaller torque in the working process.
As an embodiment of the present invention, the sandblasting assembly includes a sand storage tank 14 fixedly mounted on the guide plate 15, and a sand pump 13 fixedly mounted on the guide plate 15 and connected to the rotary table 11 through the second belt 12, wherein a feed inlet of the sand pump 13 is communicated with the sand storage tank 14, and a discharge outlet is connected to the spray head 20 through a corrugated pipe 19.
In the embodiment of the invention, when the screw rod 16 rotates, the sand pump 13 is driven to rotate through the first belt 9 and the bevel gear set 10, and sand blasting pumps in the sand storage tank 14 are pumped into the spray head 20;
it should be noted that a plurality of through holes are opened on the upper portion of the sand storage tank 14, so that the internal and external air pressures of the sand storage tank 14 are balanced during the operation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A speaker T iron surface blasting apparatus, characterized in that, speaker T iron surface blasting apparatus includes:
the mounting frame structure is movably provided with a spray head (20) used for carrying out sand blasting treatment on the T iron of the loudspeaker;
the lifting component is arranged on the mounting frame structure and connected with the spray head (20) so as to drive the spray head (20) to ascend or descend in a spatial vertical direction;
the circular motion mechanism is connected with the lifting assembly, drives the spray head (20) to do circular motion in the process that the lifting assembly drives the spray head (20) to ascend or descend, and is arranged on the mounting frame structure;
the sandblast subassembly, the sandblast subassembly is installed on the lifting unit, the sandblast subassembly with shower nozzle (20) are connected and are switched on, the sandblast subassembly is in the lifting unit drives shower nozzle (20) rise or the in-process that descends to shower nozzle (20) feed.
2. The device for blasting sand on the surface of T iron of a loudspeaker in claim 1, wherein the lifting assembly is connected with the sand blasting assembly through a transmission assembly, and the transmission assembly comprises a bevel gear set (10) arranged on the lifting assembly, a first belt (9) connected with the bevel gear set (10) and the lifting assembly;
the bevel gear set (10) comprises a first bevel gear rotationally mounted on the circular motion mechanism, a second bevel gear meshed with the first bevel gear and rotationally mounted on the lifting assembly, the second bevel gear is connected and rotationally mounted on a turntable (11) on the lifting assembly, and the turntable (11) is connected with the sand blasting assembly through a second belt (12).
3. The T iron surface sand blasting device for the loudspeaker according to claim 1, wherein the mounting frame structure comprises a horizontally arranged bottom plate (1) and a mounting plate (3) arranged in parallel with the bottom plate (1) through a vertical plate (2), the circular motion structure is arranged on the lower portion of the mounting plate (3), a supporting piece (21) is fixedly arranged on the upper portion of the bottom plate (1), and a permanent magnet (22) is arranged on the supporting piece (21).
4. The T iron surface sand blasting device for the loudspeaker according to claim 2, wherein the lifting assembly comprises a power device (6) fixedly mounted on the circular motion mechanism, a screw rod (16) connected with the power device (6) and rotatably mounted on the circular motion mechanism, a threaded sleeve (17) in threaded fit with the screw rod (16), and a guide structure connected with the threaded sleeve (17) and mounted on the circular motion structure, the screw rod (16) is connected with the bevel gear through the belt (9), and the spray head (20) is fixedly mounted on the threaded sleeve (17).
5. The T iron surface sand blasting device for the loudspeaker according to claim 4, wherein the guide structure comprises a guide plate (15) fixedly mounted on the circular motion mechanism, a groove (23) formed in the guide plate (15), and a guide piece (18) with one end fixedly connected with the threaded sleeve (17) and the other end slidably matched with the groove (23), and the second bevel gear is rotatably mounted on the guide plate (15).
6. The T iron surface sand blasting device for the loudspeaker according to claim 4, wherein the circular motion mechanism comprises a fixed shaft (4) fixedly arranged on the mounting plate (3), a movable rod (5) rotatably arranged on the fixed shaft (4), and a meshing structure arranged on the movable rod (5) and connected with the screw rod (16);
the power device (6) is fixedly mounted on the movable rod (5), the screw rod (16) is rotatably mounted on the movable rod (5), and the first bevel gear is rotatably mounted on the movable rod (5).
7. The device for sandblasting the T iron surface of a loudspeaker as claimed in claim 6, wherein said meshing structure comprises a first gear (7) fixedly mounted on the end of said fixed shaft (4) far from said mounting plate (3), and a second gear (8) engaged with said first gear (7) and fixedly connected with said screw rod (16).
8. The T iron surface sand blasting device for the loudspeaker according to claim 5, wherein the sand blasting assembly comprises a sand storage tank (14) fixedly mounted on the guide plate (15), and a sand pump (13) fixedly mounted on the guide plate (15) and connected with the rotary disc (11) through the second belt (12), the inlet of the sand pump (13) is communicated with the sand storage tank (14), and the outlet of the sand pump (13) is connected with the spray head (20) through a corrugated pipe (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110843346.8A CN113400202A (en) | 2021-07-26 | 2021-07-26 | Sand blasting device for T-shaped iron surface of loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110843346.8A CN113400202A (en) | 2021-07-26 | 2021-07-26 | Sand blasting device for T-shaped iron surface of loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113400202A true CN113400202A (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110843346.8A Pending CN113400202A (en) | 2021-07-26 | 2021-07-26 | Sand blasting device for T-shaped iron surface of loudspeaker |
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|---|---|
| CN (1) | CN113400202A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598852A (en) * | 2015-12-25 | 2016-05-25 | 安徽迈吉尔模具有限公司 | Workpiece surface sand blasting treatment control equipment |
| CN209717417U (en) * | 2019-04-30 | 2019-12-03 | 佛山市雨禾电器制造有限公司 | A kind of adjustable automatic sand blasting mechanism of inner vessel for electrical cooking-vessel processing |
| CN211332787U (en) * | 2019-09-11 | 2020-08-25 | 上海旅峤不锈钢有限公司 | Rotary sand blasting device |
| CN111922847A (en) * | 2020-08-19 | 2020-11-13 | 湖南省宝满科技开发有限公司 | Oil cylinder body surface circumference finish machining device for machining |
| CN112372473A (en) * | 2020-11-28 | 2021-02-19 | 西峡县内燃机进排气管有限责任公司 | A grinding device for processing of turbo charger casing |
| CN112404824A (en) * | 2020-11-25 | 2021-02-26 | 江西科技学院 | Automatic welded structure and new energy automobile axle processing equipment |
| CN112936111A (en) * | 2021-02-21 | 2021-06-11 | 余杰 | Rusty pipeline sand blasting device with recovery function and double-sided sand blasting function |
| CN113054574A (en) * | 2021-03-29 | 2021-06-29 | 李影 | Prevent wind dirt switch board that cools down |
-
2021
- 2021-07-26 CN CN202110843346.8A patent/CN113400202A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598852A (en) * | 2015-12-25 | 2016-05-25 | 安徽迈吉尔模具有限公司 | Workpiece surface sand blasting treatment control equipment |
| CN209717417U (en) * | 2019-04-30 | 2019-12-03 | 佛山市雨禾电器制造有限公司 | A kind of adjustable automatic sand blasting mechanism of inner vessel for electrical cooking-vessel processing |
| CN211332787U (en) * | 2019-09-11 | 2020-08-25 | 上海旅峤不锈钢有限公司 | Rotary sand blasting device |
| CN111922847A (en) * | 2020-08-19 | 2020-11-13 | 湖南省宝满科技开发有限公司 | Oil cylinder body surface circumference finish machining device for machining |
| CN112404824A (en) * | 2020-11-25 | 2021-02-26 | 江西科技学院 | Automatic welded structure and new energy automobile axle processing equipment |
| CN112372473A (en) * | 2020-11-28 | 2021-02-19 | 西峡县内燃机进排气管有限责任公司 | A grinding device for processing of turbo charger casing |
| CN112936111A (en) * | 2021-02-21 | 2021-06-11 | 余杰 | Rusty pipeline sand blasting device with recovery function and double-sided sand blasting function |
| CN113054574A (en) * | 2021-03-29 | 2021-06-29 | 李影 | Prevent wind dirt switch board that cools down |
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Application publication date: 20210917 |