CN205967285U - Tribrachia system shell device - Google Patents
Tribrachia system shell device Download PDFInfo
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- CN205967285U CN205967285U CN201620771302.3U CN201620771302U CN205967285U CN 205967285 U CN205967285 U CN 205967285U CN 201620771302 U CN201620771302 U CN 201620771302U CN 205967285 U CN205967285 U CN 205967285U
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Abstract
The utility model relates to an equipment of using is cast to the machinery essence, in particular to tribrachia system shell device, hang the sand machine including system shell manipulator and with the pulp grinder of being stained with that system shell manipulator was mutually supported with the cylinder, make the shell manipulator and include electrical system, base, roating seat and control system, the roating seat pass through slewing bearing and connect on the base, be equipped with three on the roating seat and be 120 degrees contained angles between three lifing arms each other by lifting motor driven lifing arm, on every lifing arm all the installation be equipped with the arm on by swing motor drive's swing arm, the lifing arm can follow perpendicular ground orientation and do the action of going up and down, the beneficial effects of the utility model are that: this system shell manipulator adopts three work station structure of waist carousel rotation type, and the waist can carry out anticlockwise or rotate right according to the settlement. Three stations are corresponding the loading and unloading shell in the precision casting shell system shell technology, be stained with the thick liquid, hang the three process of sand.
Description
Technical field
The present invention relates to a kind of machinery essence casting equipment, particularly to a kind of three arm housing apparatus.
Background technology
Hot investment casting is most basic heat processing technique in manufacturing industry, belongs to the more intensive industry of labour, especially exists
Shell operation recruitment processed is many, the amount of labour is big.
State Intellectual Property Office discloses Patent No. 201220236724.2, and patent name is, a kind of three arm manufacturing casing machines
Tool hand, including electric-control system, base and rotating seat, described rotating seat is seated on base, rotating seat be provided with three by
The lifting arm that lift motor drives, every lifting arm is respectively mounted the swing arm being driven by rotary actuator, swing arm is provided with hand
Arm.Blowing function do not installed by the problem 1 that this manipulator exists in the course of the work, manipulator, for the workpiece of deep hole, groove, no
Method is processed；2nd, because not having slurry liquid level identifying device it is impossible to detect liquid level, there is larger error in the working depth of manipulator,
The requirement of technique can not be met；3rd, Manipulator Hand type of drive is common electric machine, and controllable precise can not be accomplished it is impossible to expire in position
The shell special processed of a lot of product of foot requires.
Content of the invention
The purpose of the present invention is aiming at the drawbacks described above of prior art presence, provides a kind of three arm housing apparatus.
A kind of three arm housing apparatus, its technical scheme is：Including shell making mechanical hand（1）And and shell making mechanical hand（1）Phase
Mutually coordinate is stained with pulp grinder（2）With cylinder hanging sand machine（3）, shell making mechanical hand（1）Including electric-control system（1.1）, base（1.2）, rotation
Swivel base（1.3）And control system, described rotating seat（1.3）Base is connected to by pivoting support（1.2）On, rotating seat
（1.3）It is provided with three lifting arms being driven by lift motor（1.4）, it is in mutually 120 degree of angles between three lifting arms, every
Lifting arm（1.4）On be respectively mounted the swing arm being driven by rotary actuator（1.5）, swing arm（1.5）It is provided with arm（1.6）, institute
The lifting arm stated（1.4）Lifting action, swing arm can be done along direction perpendicular to the ground（1.5）It is arranged on lifting arm（1.4）On water
On flat axle, swing arm（1.5）Hunting range along trunnion axis is 0 ~ 135 °, is stained with pulp grinder（2）（With cylinder hanging sand machine（3）Mutually it
Between be in 120 degree of angles, arm（1.6）Do continuously left-handed, dextrorotation or by setting rotation in advance on the basis of arm installation axle
The angular turn specified；Described shell making mechanical hand（1）Control system be made up of PLC and touch-screen, each motor
Parameter can be set by touch-screen and PLC；Described shell making mechanical hand（1）Rotation, lifting arm（1.4）Lifting, swing arm
（1.5）Swing, arm（1.6）Rotation type of drive adopt stepper motor or servomotor；
Described is stained with pulp grinder（2）Including being stained with slurry bucket（2.1）, rotation seat（2.2）, puddler（2.3）, it is stained with slurry bucket（2.1）Gu
It is scheduled on rotation seat（2.2）On, described is stained with slurry bucket（2.1）Inside be provided with puddler（2.3）, it is stained with slurry bucket（2.1）Inside set
There is liquid level sensing device, liquid level sensing device is ultrasonic sensor, manipulator passes through ultrasound feedback signal, carrys out adjust automatically
It is stained with the working depth of mechanical arm during slurry；
Described cylinder hanging sand machine（3）Including cylinder（3.1）, motor（3.2）, described cylinder（3.1）Outside
Connect motor（3.2）, cylinder（3.1）Inwall be provided with sand launder（3.3）, described upper sand launder（3.3）Uniform point
Cloth is in cylinder（3.1）Inwall on, cylinder（3.1）Top and bottom pass through support bar（3.5）Fixed grit（3.4）；
Described shell making mechanical hand（1）Bottom be fixed on base（5）On, shell making mechanical hand（1）Top be provided with casing
（4）, pneumatic rotary supporting mechanism（6）Top connect casing（4）, casing（4）For rotating unit, pneumatic rotary supporting mechanism
（6）Bottom be fixed on base（5）On, pneumatic rotary supporting mechanism（6）Drive the casing on top（4）Rotate.
Described is stained with slurry bucket（2.1）External stability be stained with slurry inflatable body（2.4）, described is stained with slurry inflatable body（2.4）
Including fixed support（2.4.1）, tracheae（2.4.2）, magnetic valve（2.4.3）, jet thrust（2.4.4）, fixed support（2.4.1）On
Fixing tracheae（2.4.2）And jet thrust（2.4.4）, described tracheae（2.4.2）It is provided with magnetic valve（2.4.3）, described spray
Gas head（2.4.4）It is provided with multigroup.
Described shell making mechanical hand 1 be stained with pulp grinder 2, the arrangement mode of cylinder hanging sand machine 3 has, 1：1：1 type, 1：2：2 types, 1：
3：2 types.
Described pneumatic rotary supporting mechanism（6）Including shell（6.1）, rotary shaft（6.2）, bearing（6.3）, seal
（6.4）, air inlet pipeline（6.5）, outlet pipe（6.6）, shell（6.1）Centre be provided with rotary shaft（6.2）, described rotary shaft
（6.2）With shell（6.1）Inner chamber between pass through seal（6.4）Sealing, rotary shaft（6.2）With shell（6.1）Top and
Bottom is respectively equipped with bearing（6.3）, described rotary shaft（6.2）Inside be provided with air inlet pipeline（6.5）And outlet pipe
（6.6）, air inlet pipeline（6.5）And outlet pipe（6.6）Connect air driven pump, pneumatic rotary supporting mechanism is controlled by air driven pump
（6）Rotation.
The invention has the beneficial effects as follows：This shell making mechanical hand adopts waist turntable rotation formula three station structure, and waist can be pressed
It is set for anticlockwise or right rotation.Three stations correspond to the handling shell in precision casting shell process for making shell, is stained with slurry, hanging sand
Three technical process.By lifting arm, swing arm and two hands are constituted every station, and lifting arm can lift along direction perpendicular to the ground
Action, swing arm does 0 ~ 135 ° of wobbling action with the trunnion axis being arranged on lifting arm, and hand with hand installation axle can be then
Benchmark does continuously left-handed, dextrorotation or rotates stopping after the angle specified by setting in advance.Lifting arm, swing arm and hand
Responsiveness, operating position, the time of staying all can individually set.By joining of the lifting arm of each station, swing arm and hand
Close and then can replace manually realizing being stained with slurry, overfall, homogenate, drip slurry, purging deep hole block and hanging sand, the action such as floating sand.
Brief description
Accompanying drawing 1 is the structural representation of the present invention；
Accompanying drawing 2 is the structural representation of shell making mechanical hand of the present invention；
Accompanying drawing 3 is the structural representation that the present invention is stained with pulp grinder；
Accompanying drawing 4 is the front view of cylinder hanging sand machine of the present invention；
Accompanying drawing 5 is the side view of cylinder hanging sand machine of the present invention；
Accompanying drawing 6 is each station structure schematic diagram in embodiments of the invention 1；
Accompanying drawing 7 is embodiments of the invention 3 structural representation；
Accompanying drawing 8 is the mounting structure schematic diagram of pneumatic rotary supporting mechanism；
Accompanying drawing 9 is the structural representation of pneumatic rotary supporting mechanism；
Upper in figure：Shell making mechanical hand 1, it is stained with pulp grinder 2, cylinder hanging sand machine 3, casing 4, base 5, pneumatic rotary supporting mechanism 6；
Electric-control system 1.1, base 1.2, rotating seat 1.3, lifting arm 1.4, swing arm 1.5, arm 1.6, it is stained with slurry bucket 2.1, rotation seat
2.2nd, puddler 2.3, be stained with slurry inflatable body 2.4；Fixed support 2.4.1, tracheae 2.4.2, magnetic valve 2.4.3, jet thrust
2.4.4, cylinder 3.1, motor 3.2, upper sand launder 3.3, screen cloth 3.4, support bar 3.5；Shell 6.1, rotary shaft 6.2, bearing
6.3rd, seal 6.4, air inlet pipeline 6.5, outlet pipe 6.6.
Specific embodiment
In conjunction with accompanying drawing 1-6,8 and 9, the invention will be further described：
Embodiment 1：
A kind of three arm housing apparatus, its technical scheme is：Including shell making mechanical hand 1 and with shell making mechanical hand 1 phase interworking
That closes is stained with pulp grinder 2 and cylinder hanging sand machine 3, shell making mechanical hand 1, is stained with pulp grinder 2, cylinder hanging sand machine 3 according to 1：1：1 arrangement mode enters
Row combination, shell making mechanical hand 1 includes electric-control system 1.1, base 1.2, rotating seat 1.3 and control system, described rotating seat 1.3
It is connected on base 1.2 by pivoting support, rotating seat 1.3 is provided with three lifting arms being driven by lift motor 1.4, three
It is in mutually 120 degree of angles between lifting arm, every lifting arm 1.4 is respectively mounted the swing arm 1.5 being driven by rotary actuator, swing
Arm 1.5 is provided with arm 1.6, and described lifting arm 1.4 can do lifting action along direction perpendicular to the ground, and swing arm 1.5 is arranged on
On trunnion axis on lifting arm 1.4, swing arm 1.5 is 0 ~ 135 ° along the hunting range of trunnion axis, is stained with pulp grinder 2 and cylinder hanging sand machine
3 is in 120 degree of angles each other, and arm 1.6 does continuously left-handed, dextrorotation or by setting in advance on the basis of arm installation axle
Rotate the angular turn specified；The control system of described shell making mechanical hand 1 is made up of PLC and touch-screen, each motor
Parameter can be set by touch-screen and PLC；The rotation of described shell making mechanical hand 1, the lifting of lifting arm 1.4, swing arm 1.5
Swing, arm 1.6 rotation type of drive adopt stepper motor or servomotor；
Described pulp grinder 2 of being stained with includes being stained with slurry bucket 2.1, rotation seat 2.2, puddler 2.3, is stained with slurry bucket 2.1 and is fixed on rotation seat
On 2.2, the described inside being stained with slurry bucket 2.1 is provided with puddler 2.3, and the inside being stained with slurry bucket 2.1 is provided with liquid level sensing device, liquid level
Sensing device is ultrasonic sensor, and manipulator passes through ultrasound feedback signal, carrys out the work that adjust automatically is stained with mechanical arm during slurry
Highly；
Described cylinder hanging sand machine 3 includes cylinder 3.1, motor 3.2, and the external connection of described cylinder 3.1 drives
Motor 3.2, the inwall of cylinder 3.1 is provided with sand launder 3.3, and described upper sand launder 3.3 is evenly distributed in the inwall of cylinder 3.1
On, support bar 3.5 fixed grit 3.4 is passed through in the top of cylinder 3.1 and bottom；
The bottom of described shell making mechanical hand 1 is fixed on base 5, and the top of shell making mechanical hand 1 is provided with casing 4, pneumatic
The top of revolving support mechanism 6 connects casing 4, and casing 4 is rotating unit, and the bottom of pneumatic rotary supporting mechanism 6 is fixed on bottom
On seat 5, pneumatic rotary supporting mechanism 6 drives the casing 4 on top to rotate.
Slurry inflatable body 2.4 is stained with the described external stability being stained with slurry bucket 2.1, and described slurry inflatable body 2.4 of being stained with is included admittedly
Fixed rack 2.4.1, tracheae 2.4.2, magnetic valve 2.4.3, jet thrust 2.4.4, fixed support 2.4.1 fixes tracheae 2.4.2 and
Jet thrust 2.4.4, described tracheae 2.4.2 are provided with magnetic valve 2.4.3, and described jet thrust 2.4.4 is provided with multigroup.
Described pneumatic rotary supporting mechanism 6 includes shell 6.1, rotary shaft 6.2, bearing 6.3, seal 6.4, air inlet pipe
Road 6.5, outlet pipe 6.6, the centre of shell 6.1 is provided with rotary shaft 6.2, the inner chamber of described rotary shaft 6.2 and shell 6.1 it
Between sealed by seal 6.4, the top of rotary shaft 6.2 and shell 6.1 and bottom are respectively equipped with bearing 6.3, described rotation
The inside of axle 6.2 is provided with air inlet pipeline 6.5 and outlet pipe 6.6, and air inlet pipeline 6.5 and outlet pipe 6.6 connect air driven pump, lead to
Cross the rotation that air driven pump controls pneumatic rotary supporting mechanism 6.
Embodiment 2：
As different from Example 1, shell making mechanical hand 1, be stained with the arrangement mode of pulp grinder 2, cylinder hanging sand machine 3 according to 1：2：2
Arrangement mode be combined, be stained with pulp grinder 2 and be provided with two and be stained with slurry bucket, cylinder hanging sand machine 3 is provided with two series cylinders, respectively single cylinder
Combine with twin-roll, single cylinder is suitable for the hanging sand of single workpiece, and twin-roll is suitable for the hanging sand of dual-workpiece, single cylinder and twin-roll
Between mutually can rotate switching, be stained with pulp grinder 2 and cylinder hanging sand machine 3 be capable of mutually rotating by control system, by control
System processed is capable of mutually rotating, and being suitable for workpiece needs to be stained with 2 kinds of different slurries, is capable of one-step shaping, reduces work
Sequence, reduces floor space, and the cost of investment of equipment.
Embodiment 3：
As shown in fig. 7, as different from Example 1, shell making mechanical hand 1, be stained with pulp grinder 2, the arrangement mode of cylinder hanging sand machine 3
According to 1：3：2 arrangement mode is combined, and is stained with pulp grinder combination for 3, is stained with pulp grinder 2 and is provided with three and be stained with slurry bucket, cylinder hanging sand machine 3 sets
There are two series cylinders, respectively single cylinder and twin-roll combine, and single cylinder is suitable for the hanging sand of single workpiece, and twin-roll is suitable for duplex
The hanging sand of part, mutually can rotate switching between single cylinder and twin-roll, be stained with pulp grinder 2 and cylinder hanging sand machine 3 passes through control system
It is capable of mutually rotating, is capable of mutually rotating by control system, being suitable for workpiece needs to be stained with 3 kinds of different slurries,
It is capable of one-step shaping, reduces operation, reduce floor space, and the cost of investment of equipment.
Illustrated with embodiment 1：A kind of shell side method processed of three arm housing apparatus, comprises the following steps：
1）Wherein a lifting arm 1.4 hang and take on station A by workpiece suspension on two arms of a swing arm,
Then drive rotating seat to rotate to being stained with slurry station B by rotation motor, carry out formwork in this operation and be stained with slurry, simultaneously in rotation to extension
Take and two groups of workpiece are hung on the arm of second swing arm of station A；Second swing arm rotates to being stained with slurry station B, first
Swing arm rotates to hanging sand station C, and second swing arm rotates to being stained with slurry station B, and carries out formwork respectively on station and be stained with slurry,
And hang two groups of workpiece on rotation is to the arm of the 3rd swing arm hanging and taking station A simultaneously；Then rotating seat continues rotation
Turn, now first swing arm rotates to hanging and taking station A, and second swing arm rotates to hanging sand station C, the 3rd swing arm rotation
Go to and be stained with slurry station B, and carry out on respective station respectively formwork take off, hanging sand and be stained with slurry operation, that is, complete a job and follow
Ring；
On workpiece（As shell handle, suspension hook or suspension member hanging box）Upper installation radio-frequency card, radio-frequency card is adopted as shell information
The medium of collection, the information of collection includes product type, and default technological parameter, On-line Product job information etc., with shell work processed
The propulsion of skill, the information that works online of product is updated in real time；
2）Synchronization manipulator during robot work three stations A, B, C are respectively at dislodging shell, are stained with slurry, hang
The working condition of sand；Manipulator completes after various work by the program setting, and lifting arm rises to the top, swings arm swing
To vertically, i.e. former reset is put；Manipulator stops the rotation after rotating 120 °；Tri- stations of A, B, C enter is stained with slurry, hanging sand, dislodging shell
Working condition；After the completion of work, manipulator resets, and rotates 120 ° again, stops；Manipulator repeat the above steps always, just
Complete the shell process processed of hot investment casting：
3）During precision casting surface shell, this mechanical hand getting of slurry process is stained with being stained with for the workpiece with deep hole and block
Slurry inflatable body, by fixing tracheae 2.4.2 and jet thrust 2.4.4 on fixed support 2.4.1, described tracheae 2.4.2 sets
There is magnetic valve 2.4.3, solenoid valve control jet thrust is operated, the slurry of being stained with completing the workpiece to deep hole and block is blown, that is, exist
It is stained with slurry station to stop to default attitude by workpiece, is now arranged on the tracheae being stained with slurry bucket 2.1 top and jet thrust is opened, to being stained with
The deep hole of workpiece of slurry and block position are blown it is ensured that being stained with slurry effect.
The above, be only the preferred embodiment of inventing type, any those of ordinary skill in the art are all possibly also with upper
The technical scheme stating elaboration is changed to inventing type or is revised as equivalent technical scheme.Therefore, according to inventing type
Any simple modification or substitute equivalents that technical scheme is carried out, belong to the greatest extent the scope that inventing type claims.
Claims (4)
1. a kind of three arm housing apparatus, is characterized in that：Including shell making mechanical hand（1）And and shell making mechanical hand（1）Cooperate
Be stained with pulp grinder（2）With cylinder hanging sand machine（3）, shell making mechanical hand（1）Including electric-control system（1.1）, base（1.2）, rotating seat
（1.3）And control system, described rotating seat（1.3）Base is connected to by pivoting support（1.2）On, rotating seat（1.3）On
It is provided with three lifting arms being driven by lift motor（1.4）, it is in mutually 120 degree of angles between three lifting arms, every lifting arm
（1.4）On be respectively mounted the swing arm being driven by rotary actuator（1.5）, swing arm（1.5）It is provided with arm（1.6）, described liter
Fall arm（1.4）Lifting action, swing arm can be done along direction perpendicular to the ground（1.5）It is arranged on lifting arm（1.4）On trunnion axis on,
Swing arm（1.5）Hunting range along trunnion axis is 0 ~ 135 °, is stained with pulp grinder（2）（With cylinder hanging sand machine（3）It is in 120 each other
Degree angle, arm（1.6）Continuously left-handed, dextrorotation or the angle specified by setting rotation in advance is done on the basis of arm installation axle
Degree rotates；Described shell making mechanical hand（1）Control system be made up of PLC and touch-screen, the parameter of each motor can be led to
Cross touch-screen and PLC sets；Described shell making mechanical hand（1）Rotation, lifting arm（1.4）Lifting, swing arm（1.5）Pendulum
Dynamic, arm（1.6）Rotation type of drive adopt stepper motor or servomotor；
Described is stained with pulp grinder（2）Including being stained with slurry bucket（2.1）, rotation seat（2.2）, puddler（2.3）, it is stained with slurry bucket（2.1）It is fixed on
Rotation seat（2.2）On, described is stained with slurry bucket（2.1）Inside be provided with puddler（2.3）, it is stained with slurry bucket（2.1）Inside be provided with liquid
Sensing equipment, liquid level sensing device is ultrasonic sensor, and manipulator passes through ultrasound feedback signal, carrys out adjust automatically and be stained with slurry
When mechanical arm working depth；
Described cylinder hanging sand machine（3）Including cylinder（3.1）, motor（3.2）, described cylinder（3.1）External connection
Motor（3.2）, cylinder（3.1）Inwall be provided with sand launder（3.3）, described upper sand launder（3.3）It is evenly distributed in
Cylinder（3.1）Inwall on, cylinder（3.1）Top and bottom pass through support bar（3.5）Fixed grit（3.4）；
Described shell making mechanical hand（1）Bottom be fixed on base（5）On, shell making mechanical hand（1）Top be provided with casing（4）、
Pneumatic rotary supporting mechanism（6）Top connect casing（4）, casing（4）For rotating unit, pneumatic rotary supporting mechanism（6）'s
Bottom is fixed on base（5）On, pneumatic rotary supporting mechanism（6）Drive the casing on top（4）Rotate.
2. a kind of three arm housing apparatus according to claim 1, is characterized in that：Described is stained with slurry bucket（2.1）Outside solid
Surely it is stained with slurry inflatable body（2.4）, described is stained with slurry inflatable body（2.4）Including fixed support（2.4.1）, tracheae（2.4.2）, electricity
Magnet valve（2.4.3）, jet thrust（2.4.4）, fixed support（2.4.1）Upper fixing tracheae（2.4.2）And jet thrust（2.4.4）, institute
The tracheae stated（2.4.2）It is provided with magnetic valve（2.4.3）, described jet thrust（2.4.4）It is provided with multigroup.
3. a kind of three arm housing apparatus according to claim 1, is characterized in that：Described shell making mechanical hand 1 be stained with pulp grinder
2nd, the arrangement mode of cylinder hanging sand machine 3 has, and 1：1：1 type, 1：2：2 types, 1：3：2 types.
4. a kind of three arm housing apparatus according to claim 1, is characterized in that：Described pneumatic rotary supporting mechanism（6）
Including shell（6.1）, rotary shaft（6.2）, bearing（6.3）, seal（6.4）, air inlet pipeline（6.5）, outlet pipe（6.6）,
Shell（6.1）Centre be provided with rotary shaft（6.2）, described rotary shaft（6.2）With shell（6.1）Inner chamber between by sealing
Part（6.4）Sealing, rotary shaft（6.2）With shell（6.1）Top and bottom be respectively equipped with bearing（6.3）, described rotary shaft
（6.2）Inside be provided with air inlet pipeline（6.5）And outlet pipe（6.6）, air inlet pipeline（6.5）And outlet pipe（6.6）Connect
Air driven pump, controls pneumatic rotary supporting mechanism by air driven pump（6）Rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620771302.3U CN205967285U (en) | 2016-07-21 | 2016-07-21 | Tribrachia system shell device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620771302.3U CN205967285U (en) | 2016-07-21 | 2016-07-21 | Tribrachia system shell device |
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| CN205967285U true CN205967285U (en) | 2017-02-22 |
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ID=58025759
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106180560A (en) * | 2016-07-21 | 2016-12-07 | 东营市东胜机械自动化有限公司 | A kind of three arm housing apparatus and shell side method processed |
| CN112170781A (en) * | 2020-09-25 | 2021-01-05 | 泰州鑫宇精工股份有限公司 | Method and device for improving environmental protection performance of sand spraying machine |
| CN112589051A (en) * | 2020-12-15 | 2021-04-02 | 南京琮咀科技发展有限公司 | Precision part sand mold casting process |
-
2016
- 2016-07-21 CN CN201620771302.3U patent/CN205967285U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106180560A (en) * | 2016-07-21 | 2016-12-07 | 东营市东胜机械自动化有限公司 | A kind of three arm housing apparatus and shell side method processed |
| CN112170781A (en) * | 2020-09-25 | 2021-01-05 | 泰州鑫宇精工股份有限公司 | Method and device for improving environmental protection performance of sand spraying machine |
| CN112170781B (en) * | 2020-09-25 | 2022-02-22 | 泰州鑫宇精工股份有限公司 | Method and device for improving environmental protection performance of sand spraying machine |
| CN112589051A (en) * | 2020-12-15 | 2021-04-02 | 南京琮咀科技发展有限公司 | Precision part sand mold casting process |
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