CN107738168A - A kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus - Google Patents
A kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus Download PDFInfo
- Publication number
- CN107738168A CN107738168A CN201711103246.1A CN201711103246A CN107738168A CN 107738168 A CN107738168 A CN 107738168A CN 201711103246 A CN201711103246 A CN 201711103246A CN 107738168 A CN107738168 A CN 107738168A
- Authority
- CN
- China
- Prior art keywords
- sliding block
- motor
- derusting
- vertical clapboard
- water cooled
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/02—Frames; Beds; Carriages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
- B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
- B24B47/04—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables by mechanical gearing only
Abstract
The invention discloses a kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus, including base, mobile sliding block, the first motor, first shaft coupling, second shaft coupling and derusting device, the first motor is installed with the mobile sliding block, the output shaft of first motor is connected with first shaft coupling by flat key, insertion is provided with slide rail on the right side of the vertical clapboard, sliding block is slidably fitted with the upside of slide rail, derusting device is installed with the upside of the sliding block.The present invention disclosure satisfy that the rotating shaft of different length and different-diameter carries out derusting polishing, greatly improve the versatility of device；Coordinated by inner slide and the first spring, so that the fine grinding layer of sand inside grinding head is close to the surface of rotating shaft, can effectively avoid grinding head from departing from rotating shaft, prevent polishing less than situation；By horizontally slipping for derusting device, so as to greatly improve the effect of countershaft surface polishing derusting, the uneven situation of roughness is avoided the occurrence of.
Description
Technical field
The present invention relates to machine field, specifically a kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus.
Background technology
Rotating shaft, as the term suggests it is that connection zero main part of product must be used, for both bearing moment of flexure in rotation work
The axle of moment of torsion is born again, in Water cooled air conditionerses motor, the rotating shaft building block important as motor, in rotating shaft process of manufacture
In, because rotating shaft raw material can aoxidize in long-time placement process, rotating shaft surface can get rusty after oxidation, in countershaft essence
Man-hour requirement countershaft surface is added to be derusted, traditional derusting work mainly utilizes manual polishing, but the efficiency of manual polishing
It is low and ineffective.
The content of the invention
It is an object of the invention to provide a kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus, to solve the above-mentioned back of the body
The problem of being proposed in scape technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus, including base, mobile sliding block, the first motor, first
Shaft coupling, second shaft coupling and derusting device, the base upper surface are provided with right shell body and right baffle-plate, and right shell body is put down with right baffle-plate
Go and lead is provided between right shell body and right baffle-plate, lead welded and installed is in right shell body and right baffle-plate, the right shell body
Screw mandrel is also rotatablely equipped with by bearing between right baffle-plate, the other end of screw mandrel is fixedly connected with rolled round, by shaking rolled round
Screw mandrel can be driven to rotate, screw thread be gone back on the screw mandrel mobile sliding block is installed, mobile sliding block is also slidably mounted on lead, led to
The guide and limit effect of lead is crossed, and is coordinated by screw mandrel and mobile sliding block screw thread, so that mobile sliding block is left on screw mandrel
Move right without rotating, the first motor, the output shaft of the first motor are installed with the mobile sliding block
To the left and the output shaft of the first motor is connected with first shaft coupling by flat key, and the base is provided with vertical clapboard, erect every
Plate is located at the left side of right baffle-plate, and the right side of vertical clapboard is also rotatablely equipped with second shaft coupling by universal driving shaft, and the vertical clapboard is right
Side insertion is provided with slide rail, and sliding block is slidably fitted with the upside of slide rail, and derusting device, derusting dress are installed with the upside of the sliding block
Put including fixed block, inner slide, the first spring and grinding head, the fixed block internal slide is provided with inner slide, under inner slide
The first spring is connected between end and fixed block inside, the inner slide upper end is welded with grinding head, passes through inner slide and first
Spring coordinates, so that the fine grinding layer of sand inside grinding head is close to the surface of rotating shaft, effectively grinding head can be avoided to be taken off with rotating shaft
From, prevent polishing less than situation, while also adapt to the rotating shaft of different-diameter polishing derusting work, greatly improve dress
The versatility put.
Also it is screwed on the left of the sliding block and is connected with connecting rod, the other end level of connecting rod to the left and pass through vertical clapboard, company
It is slidably connected between bar and vertical clapboard, the other end of the connecting rod is fixedly connected with rack, and motor is additionally provided with the vertical clapboard
Frame, motor rack are fixedly mounted on the left side outer wall of vertical clapboard by screw, and motor is installed with the motor rack,
Interference fit is provided with special shape gear on the output shaft of motor, and the teeth portion of special shape gear engages connection with rack, works as needs
It is fixed by the way that one end of rotating shaft is first put into first shaft coupling when countershaft is polished, then manually shake rolled round
So that screw mandrel starts to rotate, when screw mandrel starts to rotate, screw thread coordinates between screw mandrel and mobile sliding block, so that mobile sliding block
It is moved to the left until the other end of rotating shaft is inserted in second shaft coupling, then by fastening the screw in second shaft coupling by rotating shaft
It is fixed, it is then electrified to make the first motor start to rotate, so as to drive rotating shaft to start to rotate, while being powered opens motor
Begin rotate, motor in rotation process so as to drive special shape gear to start to rotate, when teeth portion and the rack of special shape gear are nibbled
During conjunction, so as to be moved to the left with carry-over bar, when rack is moved to the left, so that sliding block slides to the left, sliding block drives derusting device
Slide to the left so that the rotating shaft rotated coordinates the derusting device countershaft slided to carry out orientation and polish, by inner slide with
First spring coordinates, so that the fine grinding layer of sand inside grinding head is close to the surface of rotating shaft, can effectively avoid grinding head with turning
Axle depart from, prevent polishing less than situation, while also adapt to the rotating shaft of different-diameter polishing derusting work, carry significantly
The versatility of high device；When the teeth portion of special shape gear does not engage with rack, in the presence of second spring restoring force, so that
Sliding block resets to the right slip, so as to drive derusting device to slide to the right, by horizontally slipping for derusting device, so as to greatly improve
The effect of countershaft surface polishing derusting, avoids the occurrence of the uneven situation of roughness.
As the further scheme of the present invention：The screw mandrel is parallel with lead and screw mandrel is located at the top of lead.
As further scheme of the invention：It is fixedly connected between the vertical clapboard and base by screw.
As further scheme of the invention：The grinding head is half arc and grinding head interior surface scribbles fine grinding sand
Layer.
As further scheme of the invention：Be also associated with second spring between the sliding block and vertical clapboard, connecting rod from
Second spring inside center passes through.
As further scheme of the invention：The teeth portion of the rack is upward.
As further scheme of the invention：Half half with teeth is anodontia on the special shape gear.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention disclosure satisfy that different length and different-diameter
Rotating shaft carries out derusting polishing, greatly improves the versatility of device；Coordinated by inner slide and the first spring, so that in grinding head
The fine grinding layer of sand moment in portion is close to the surface of rotating shaft, can effectively avoid grinding head and rotating shaft from departing from, prevent polishing less than
Situation；By horizontally slipping for derusting device, so as to greatly improve the effect of countershaft surface polishing derusting, avoid the occurrence of thick
The uneven situation of rugosity.
Brief description of the drawings
Fig. 1 is a kind of structural representation of Water cooled air conditionerses machine shaft surface derusting sanding apparatus.
Fig. 2 is the structural representation inside derusting device in a kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus.
Fig. 3 is the structural representation that A portions amplify in a kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus.
In figure：1- bases, 2- right shell bodies, 3- right baffle-plates, 4- leads, 5- screw mandrels, 6- rolled rounds, 7- movements sliding block, 8- the
One motor, 9- first shaft couplings, 10- vertical clapboards, 11- second shaft couplings, 12- rotating shafts, 13- slide rails, 14- sliding blocks, 15- are removed
Become rusty device, 16- fixed blocks, 17- inner slides, 18- springs, 19- grinding heads, 20- fine sand layers, 21- connecting rods, 22- springs, 23- teeth
Bar, 24- motor racks, 25- motors, 26- special shape gears.
Embodiment
The technical scheme of this patent is described in more detail with reference to embodiment.
Refer to Fig. 1-3, a kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus, including base 1, mobile sliding block 7,
First motor 8, first shaft coupling 9, second shaft coupling 11 and derusting device 15, the upper surface of base 1 are provided with right shell body 2
With right baffle-plate 3, right shell body 2 is parallel with right baffle-plate 3 and lead 4 is provided between right shell body 2 and right baffle-plate 3, the welding peace of lead 4
In right shell body 2 and right baffle-plate 3, screw mandrel 5, screw mandrel are also rotatablely equipped with by bearing between the right shell body 2 and right baffle-plate 3
5 is parallel with lead 4 and screw mandrel 5 is located at the top of lead 4, and the other end of screw mandrel 5 is fixedly connected with rolled round 6, passes through shake
Rolled round 6 can drive screw mandrel 5 to rotate, and screw thread is gone back on the screw mandrel 5 and is provided with mobile sliding block 7, mobile sliding block 7, which is also slidably mounted on, leads
To on post 4, acted on by the guide and limit of lead 4, and coordinated by screw mandrel 5 and the mobile screw thread of sliding block 7, so that mobile slide
Block 7 is moved left and right on screw mandrel 5 without rotating, and is installed with the first motor 8 on the mobile sliding block 7, and first
The output shaft of motor 8 is to the left and the output shaft of the first motor 8 is connected with first shaft coupling 9, the bottom by flat key
Seat 1 is provided with vertical clapboard 10, and vertical clapboard 10 is located at the left side of right baffle-plate 3, is fixed and connected by screw between vertical clapboard 10 and base 1
Connect, the right side of vertical clapboard 10 is also rotatablely equipped with second shaft coupling 11, the right side of the vertical clapboard 10 insertion installation by universal driving shaft
There is slide rail 13, the upside of slide rail 13 is slidably fitted with sliding block 14, and the upside of sliding block 14 is installed with derusting device 15, derusting dress
Putting 15 includes fixed block 16, inner slide 17, the first spring 18 and grinding head 19, and the internal slide of fixed block 16 is provided with interior cunning
Block 17, the first spring 18 is connected between the lower end of inner slide 17 and the inside of fixed block 16, the upper end of inner slide 17, which is welded with, to be beaten
Bistrique 19, grinding head 19 is half arc and the interior surface of grinding head 19 scribbles fine grinding layer of sand 20, passes through the bullet of inner slide 17 and first
Spring 18 coordinates, so that the fine grinding layer of sand 20 inside grinding head 19 is close to the surface of rotating shaft 12, can effectively avoid grinding head 19
Depart from rotating shaft 12, prevent polishing less than situation, while also adapt to the rotating shaft of different-diameter polishing derusting work,
Greatly improve the versatility of device.
The left side of the sliding block 14, which is also screwed, is connected with connecting rod 21, the other end level of connecting rod 21 to the left and through it is perpendicular every
Plate 10, it is slidably connected between connecting rod 21 and vertical clapboard 10, second spring 22, connecting rod is also associated between sliding block 14 and vertical clapboard 10
21 pass through from the inside center of second spring 22, and the other end of the connecting rod 21 is fixedly connected with rack 23, the teeth portion of rack 23 to
On, motor rack 24 is additionally provided with the vertical clapboard 10, motor rack 24 is fixedly mounted on the left side outer wall of vertical clapboard 10 by screw
On, motor 25 is installed with the motor rack 24, interference fit is provided with abnormity on the output shaft of motor 25
Gear 26, half half with teeth is anodontia on special shape gear 26, and the teeth portion of special shape gear 26 engages connection with rack 23.
The present invention operation principle be：When needing countershaft 12 to be polished, by the way that one end of rotating shaft 12 is first put into
It is fixed in first shaft coupling 9, then manually rolled round 6 is shaken so that screw mandrel 5 starts to rotate, when screw mandrel 5 starts to rotate,
Screw thread coordinates between screw mandrel 5 and mobile sliding block 7, so that mobile sliding block 7 is moved to the left the other end insertion the until rotating shaft 12
In two shaft couplings 11, then rotating shaft 12 is fixed by fastening the screw in second shaft coupling 11, is then electrified to make the first driving
Motor 8 starts to rotate, and so as to drive rotating shaft 12 to start to rotate, while being powered makes motor 25 start to rotate, motor 25
So as to drive special shape gear 26 to start to rotate in rotation process, when the teeth portion of special shape gear 26 engages with rack 23, so as to
Band carry-over bar 23 is moved to the left, and when rack 23 is moved to the left, so that sliding block 14 slides to the left, sliding block 14 drives derusting device 15
Slide, polished so that the rotating shaft 12 rotated coordinates the countershaft 12 of derusting device 15 slided to carry out orientation, by interior to the left
Sliding block 17 coordinates with the first spring 18, so that the fine grinding layer of sand 20 inside grinding head 19 is close to the surface of rotating shaft 12, can have
Effect avoids grinding head 19 from departing from rotating shaft 12, prevent polish less than situation, while also adapt to the rotating shaft of different-diameter
Polishing derusting work, greatly improve the versatility of device；When the teeth portion of special shape gear 26 does not engage with rack 23, second
In the presence of the restoring force of spring 22, so that sliding block 14 resets to the right slip, so as to drive derusting device 15 to slide to the right, pass through
Derusting device 15 horizontally slips, and so as to greatly improve the effect of the surface of countershaft 12 polishing derusting, avoids the occurrence of roughness not
Uniform situation.
The better embodiment of this patent is explained in detail above, but this patent is not limited to above-mentioned embodiment party
Formula, can also be on the premise of this patent objective not be departed from one skilled in the relevant art's possessed knowledge
Make a variety of changes.
Claims (7)
1. a kind of Water cooled air conditionerses machine shaft surface derusting sanding apparatus, including base（1）, mobile sliding block（7）, first driving electricity
Machine（8）, first shaft coupling（9）, second shaft coupling（11）And derusting device（15）, it is characterised in that：The base（1）Upper surface
Provided with right shell body（2）And right baffle-plate（3）, right shell body（2）With right baffle-plate（3）Parallel and right shell body（2）With right baffle-plate（3）Between set
There is lead（4）, lead（4）Welded and installed is in right shell body（2）And right baffle-plate（3）On, the right shell body（2）With right baffle-plate
（3）Between screw mandrel is also rotatablely equipped with by bearing（5）, screw mandrel（5）The other end be fixedly connected with rolled round（6）, the movement
Sliding block（7）On be installed with the first motor（8）, the first motor（8）Output shaft to the left and the first motor
（8）Output shaft first shaft coupling is connected with by flat key（9）, the base（1）It is provided with vertical clapboard（10）, vertical clapboard（10）
Positioned at right baffle-plate（3）Left side, vertical clapboard（10）Right side second shaft coupling is also rotatablely equipped with by universal driving shaft（11）, it is described
Vertical clapboard（10）Right side insertion is provided with slide rail（13）, slide rail（13）Upside is slidably fitted with sliding block（14）, the sliding block（14）
Upside is installed with derusting device（15）, derusting device（15）Including fixed block（16）, inner slide（17）, the first spring（18）
And grinding head（19）, the fixed block（16）Internal slide is provided with inner slide（17）, inner slide（17）Lower end and fixed block
（16）The first spring is connected between inside（18）, the inner slide（17）Upper end is welded with grinding head（19）；The sliding block
（14）Left side is also screwed and is connected with connecting rod（21）, connecting rod（21）Other end level to the left and pass through vertical clapboard（10）, even
Bar（21）With vertical clapboard（10）Between be slidably connected, the connecting rod（21）The other end be fixedly connected with rack（23）, it is described perpendicular
Dividing plate（10）On be additionally provided with motor rack（24）, motor rack（24）Vertical clapboard is fixedly mounted on by screw（10）Left side outer wall
On, the motor rack（24）On be installed with motor（25）, motor（25）Output shaft on be interference fitted installation
There is special shape gear（26）, special shape gear（26）Teeth portion and rack（23）Engagement connection.
A kind of 2. Water cooled air conditionerses machine shaft surface derusting sanding apparatus according to claim 1, it is characterised in that：Institute institute
State screw mandrel（5）With lead（4）Parallel and screw mandrel（5）Positioned at lead（4）Top.
A kind of 3. Water cooled air conditionerses machine shaft surface derusting sanding apparatus according to claim 1, it is characterised in that：It is described
Vertical clapboard（10）With base（1）Between be fixedly connected by screw.
A kind of 4. Water cooled air conditionerses machine shaft surface derusting sanding apparatus according to claim 1, it is characterised in that：It is described
Grinding head（19）For half arc and grinding head（19）Interior surface scribbles fine grinding layer of sand（20）.
A kind of 5. Water cooled air conditionerses machine shaft surface derusting sanding apparatus according to claim 1, it is characterised in that：It is described
Sliding block（14）With vertical clapboard（10）Between be also associated with second spring（22）, connecting rod（21）From second spring（22）Inside center is worn
Cross.
A kind of 6. Water cooled air conditionerses machine shaft surface derusting sanding apparatus according to claim 1, it is characterised in that：It is described
Rack（23）Teeth portion it is upward.
A kind of 7. Water cooled air conditionerses machine shaft surface derusting sanding apparatus according to claim 1, it is characterised in that：It is described
Special shape gear（26）Upper half half with teeth is anodontia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711103246.1A CN107738168B (en) | 2017-11-10 | 2017-11-10 | Water-cooled air conditioner motor pivot surface rust cleaning grinding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711103246.1A CN107738168B (en) | 2017-11-10 | 2017-11-10 | Water-cooled air conditioner motor pivot surface rust cleaning grinding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107738168A true CN107738168A (en) | 2018-02-27 |
| CN107738168B CN107738168B (en) | 2020-07-10 |
Family
ID=61234268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711103246.1A Active CN107738168B (en) | 2017-11-10 | 2017-11-10 | Water-cooled air conditioner motor pivot surface rust cleaning grinding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107738168B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109434649A (en) * | 2018-10-23 | 2019-03-08 | 倪昌锋 | A kind of spacing adjustable type air hose machine shaft surface polishing derusting device |
| CN111963722A (en) * | 2020-08-05 | 2020-11-20 | 河南泉舜流体控制科技有限公司 | Detachable port sealing connector of metal sealing rotary ball valve |
| CN113814833A (en) * | 2021-09-28 | 2021-12-21 | 湖州诚创自动化科技有限公司 | Servo laser of duplex position explodes a mouthful flat grinding machine |
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| DE19943904A1 (en) * | 1999-09-14 | 2001-03-15 | Ruediger Ufermann | Transmission device for multi-function hand-held tools with pneumatic drill action has bevel pinion to drive second pinion and counter-rotating beel gears |
| CN2575254Y (en) * | 2002-06-19 | 2003-09-24 | 深圳市智莱科技有限公司 | Radio-frequency key digital code permutation lock arrangement |
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| CN107081666A (en) * | 2017-06-16 | 2017-08-22 | 长沙鼎成新材料科技有限公司 | A kind of building bar is efficiently polished rust removalling equipment |
| CN107234522A (en) * | 2017-07-28 | 2017-10-10 | 长兴鸿鹄耐磨材料有限公司 | A kind of refractory brick abrasive machining device |
| CN207616340U (en) * | 2017-11-10 | 2018-07-17 | 苏树强 | A kind of Water cooled air conditioners machine shaft surface derusting grinding device |
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|---|---|---|---|---|
| DE19943904A1 (en) * | 1999-09-14 | 2001-03-15 | Ruediger Ufermann | Transmission device for multi-function hand-held tools with pneumatic drill action has bevel pinion to drive second pinion and counter-rotating beel gears |
| CN2575254Y (en) * | 2002-06-19 | 2003-09-24 | 深圳市智莱科技有限公司 | Radio-frequency key digital code permutation lock arrangement |
| CN102152208A (en) * | 2010-12-30 | 2011-08-17 | 宁波大榭开发区综研化学有限公司 | Grinding device of pipes used for curved surface anti-buckling tests of adhesive tapes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109434649A (en) * | 2018-10-23 | 2019-03-08 | 倪昌锋 | A kind of spacing adjustable type air hose machine shaft surface polishing derusting device |
| CN111963722A (en) * | 2020-08-05 | 2020-11-20 | 河南泉舜流体控制科技有限公司 | Detachable port sealing connector of metal sealing rotary ball valve |
| CN113814833A (en) * | 2021-09-28 | 2021-12-21 | 湖州诚创自动化科技有限公司 | Servo laser of duplex position explodes a mouthful flat grinding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107738168B (en) | 2020-07-10 |
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