CN210730904U - Dewaxing device - Google Patents
Dewaxing device Download PDFInfo
- Publication number
- CN210730904U CN210730904U CN201921898813.1U CN201921898813U CN210730904U CN 210730904 U CN210730904 U CN 210730904U CN 201921898813 U CN201921898813 U CN 201921898813U CN 210730904 U CN210730904 U CN 210730904U
- Authority
- CN
- China
- Prior art keywords
- spiral
- spiral channel
- furnace body
- action cavity
- dewaxing
- 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.)
- Active
Links
Images
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
The utility model relates to a dewaxing device, which comprises a dewaxing kettle, a placing basket for placing casting shells and a material pushing trolley for conveying the placing basket into the dewaxing kettle; the dewaxing kettle comprises a furnace body, a feed inlet and a cover door, wherein the feed inlet is formed in one end of the furnace body, the cover door is used for sealing and opening the feed inlet, the furnace body is provided with a steam generator and an air outlet valve used for discharging high-pressure steam, and the lower part of the furnace body is provided with a wax liquid outlet; the spiral channel has been seted up to the oven of furnace body, and spiral channel encircles in the periphery in effect chamber, and spiral line axis and the axle center coincidence in effect chamber of spiral channel, and the both ends of spiral channel communicate effect chamber and steam generator respectively, can reduce high-pressure steam's temperature reduction to reduce loss of pressure and the formation of comdenstion water, thereby reduce the fracture and the reduction in production cost of casting shell.
Description
Technical Field
The utility model relates to a wax matrix processing equipment technical field especially relates to a dewaxing device.
Background
The basic processes of investment casting can be divided into wax pattern casting, shell making and casting by firing. The manufacture of the shell itself is critical, since the shell plays a critical role in the quality of the cast part. Common shell processing techniques include: degreasing and degreasing the wax mould, coating and sanding the wax mould, drying and hardening the shell, melting and losing the wax mould and roasting the shell.
As the melting point of the material for manufacturing the wax pattern is usually lower, the melting loss of a small amount of wax patterns with common shells can be just put into boiling water. For large shell or large volume production applications, a specialized dewaxing tank is typically required to complete the process.
The defects of the prior art are that the action cavity of the existing steam dewaxing kettle is in a normal temperature state before high-pressure steam is introduced, so that after the high-pressure steam quickly enters the action cavity, the high-pressure steam is cooled due to the fact that the high-pressure steam contacts the inner wall of the action cavity at the normal temperature, the temperature of the high-pressure steam is reduced, the pressure of the high-pressure steam is reduced, the high-pressure steam forms condensate water on the inner wall of the action cavity, and therefore the high-pressure steam with reduced pressure can not resist the pressure of wax liquid expanded due to melting on the casting shell, the casting shell is prone to break, and meanwhile, after the condensate water on the inner wall of the action cavity is mixed with the wax liquid, the difficulty of.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a dewaxing device can reduce high-pressure steam's temperature and reduce to reduce the loss of pressure and the formation of comdenstion water, thereby reduce the fracture and the reduction in production cost of casting shell.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a dewaxing device comprises a dewaxing kettle, a placing basket for placing a casting shell and a material pushing trolley for conveying the placing basket into the dewaxing kettle; the dewaxing kettle comprises a furnace body, a feed inlet and a cover door, wherein the feed inlet is formed in one end of the furnace body, the cover door is used for sealing and opening the feed inlet, the furnace body is provided with a steam generator and an air outlet valve used for discharging high-pressure steam, and the lower part of the furnace body is provided with a wax liquid outlet; the furnace wall of the furnace body is provided with a spiral channel, the spiral channel surrounds the periphery of the action cavity, the axis of a spiral line of the spiral channel coincides with the axis of the action cavity, and two ends of the spiral channel are respectively communicated with the action cavity and the steam generator.
By adopting the technical scheme, high-pressure steam generated by the steam generator enters the action cavity through the spiral channel, a high-temperature and high-pressure environment is provided for the casting shell in the action cavity, so that wax liquid is melted and is discharged through the through hole and the wax liquid outlet in sequence, and the gas outlet valve can be opened to release pressure and discharge the high-pressure steam after the wax liquid is discharged, so that the dewaxing process is completed; high-pressure steam is introduced into the spiral channel, the inner wall of the action cavity can be preheated, and the spiral preheating prolongs the preheating time by lengthening the flow path of the high-pressure steam, so that the preheating effect and the preheating uniformity are improved, the temperature of the inner wall of the action cavity is ensured to be as same as the high-pressure steam as possible when the high-pressure steam enters the action cavity through the spiral channel, the pressure loss and the generation of condensed water are reduced, the breakage of a casting shell is reduced, and the production cost is reduced; meanwhile, the spiral channel is a cavity distributed on the periphery of the action cavity and is equivalent to a heat insulation layer so as to reduce heat loss in the action cavity.
The utility model discloses further set up to: the number of the spiral channels is two, and the two spiral channels are parallelly staggered along the axial direction of the action cavity; one of the spiral channels is communicated with the opening of the action cavity and is positioned at one end of the action cavity, the other spiral channel is communicated with the opening of the action cavity and is positioned at the other end of the action cavity, and the flow directions of the high-pressure steam in the two spiral channels are opposite.
Adopt above-mentioned technical scheme, high pressure steam gets into two crisscross helical coiled passage that set up simultaneously, preheat gradually from the both ends that act on the chamber respectively, compare single helical coiled passage's preheating, only need half preheating time alright reach single helical coiled passage's preheating effect, preheating rate accelerates, and single helical coiled passage relatively, double-deck helical coiled passage can increase the degree of consistency of preheating, improve and preheat the effect, two helical coiled passages preheat gradually from the both ends that act on the chamber respectively simultaneously, make the temperature difference that acts on the intracavity wall as far as possible little, it is better to preheat the effect.
The utility model discloses further set up to: the section of the spiral channel along the radial surface of the action cavity is rectangular, and the length direction of the rectangle is parallel to the axial direction of the action cavity.
By adopting the technical scheme, under the condition that the wall thickness of the furnace body is not changed, the flat spiral channel can improve the flow of high-pressure steam as much as possible, and simultaneously, the contact area between the high-pressure steam and the wall of the action cavity is increased, so that the preheating effect is improved, the size of the furnace body is reduced conveniently, and the occupied area of the dewaxing kettle is reduced.
The utility model discloses further set up to: an aluminum silicate cotton strip is clamped in the furnace wall of the furnace body.
By adopting the technical scheme, the heat preservation effect on the action cavity is achieved, and the heat loss is reduced.
The utility model discloses further set up to: the aluminum silicate cotton sliver is in a long and flat shape, the aluminum silicate cotton sliver is spirally distributed on the periphery of the spiral channel, and the spiral thread pitch of the aluminum silicate cotton sliver is equal to that of the spiral channel.
By adopting the technical scheme, the aluminum silicate cotton sliver is just positioned at the periphery of the spiral channel, the optimal heat preservation effect can be achieved under the condition that the using amount of the aluminum silicate cotton sliver is reduced as much as possible, and the aluminum silicate cotton sliver and the cavity of the spiral channel form a double heat preservation layer, so that the heat preservation effect is further improved.
The utility model discloses further set up to: the effect intracavity is erect and is equipped with angle billet one that the twice level was placed, angle billet one is the shape of falling V just the length direction of angle billet one is on a parallel with the axle center of effect chamber, the lower terminal surface of placing the basket sets up the spout that supplies an up end of angle billet to slide and connect.
Adopt above-mentioned technical scheme, through the cooperation of spout and an angle bar up end, be convenient for place transversely putting into or taking out of basket, the contact surface of falling V-arrangement is great simultaneously to improve the stability of placing the basket.
The utility model discloses further set up to: the pushing trolley frame is provided with two angle steel bars II which are horizontally placed and have inverted V-shaped cross sections, and the upper end face of one end, close to the feeding port, of each angle steel bar I is provided with a clamping groove along the length direction of the angle steel bar I, so that the lower end face of one end of each angle steel bar II abuts against the embedded clamping groove.
Adopt above-mentioned technical scheme, when promoting the pusher material loading, the lower terminal surface of angle billet two supports to inlay in the draw-in groove, and angle billet two realizes the butt joint with angle billet one to be convenient for slide to angle billet one on from angle billet two with placing the basket, accomplish placing the basket on the pusher promptly and shift to the effect intracavity, thereby improve the simple operation nature.
The utility model discloses further set up to: the upper end surface of the angle steel bar II is provided with a containing hole, an elastic ball which can retract into the angle steel bar II or extend out of the angle steel bar II and can elastically reset is arranged in the containing hole, and a clamping groove for clamping and embedding the elastic ball is formed in the groove wall of the sliding groove for placing the basket.
Adopt above-mentioned technical scheme, can increase the damping of placing the relative slip of basket and angle billet two to place the basket and can not the relative slip when guaranteeing angle billet two and angle billet one to take place the butt joint collision, the elasticity ball has certain cushioning effect simultaneously, can reduce the impact force that the foundry goods shell received in placing the basket, thereby reduce the fracture of foundry goods shell.
To sum up, the utility model discloses following beneficial effect has:
1. the inner wall of the action cavity can be preheated by introducing high-pressure steam into the spiral channel, and the spiral preheating prolongs the preheating time by lengthening the flow path of the high-pressure steam, so that the preheating effect and the preheating uniformity are improved, the pressure loss and the generation of condensed water are reduced, the breakage of a casting shell is reduced, and the production cost is reduced;
2. the flat and spirally distributed aluminum silicate cotton strips are arranged, so that the optimal heat preservation effect can be achieved under the condition that the using amount of the aluminum silicate cotton strips is reduced as much as possible, and the aluminum silicate cotton strips and the cavities of the spiral channels form double heat preservation layers, so that the heat preservation effect is further improved;
3. through the butt joint of angle billet two and angle billet one to be convenient for slide to angle billet one on from angle billet two with placing the basket, thereby improve the simple operation nature.
Drawings
FIG. 1 is a schematic view of the overall structure of the present embodiment;
FIG. 2 is a partial cross-sectional view of the present embodiment for embodying a spiral channel;
FIG. 3 is an overall sectional view of the dewaxing pot of this example;
FIG. 4 is a partial cross-sectional view of the dewaxing pot of this example;
fig. 5 is a partial sectional view for embodying the structure of the elastic ball of the present embodiment.
In the figure, 1, a dewaxing kettle; 2. placing a basket; 3. a material pushing vehicle; 4. a first angle steel bar; 5. a second angle steel bar; 11. a furnace body; 12. a feed inlet; 13. covering the door; 14. a steam generator; 15. an air outlet valve; 16. a pressure relief valve; 17. a spiral channel; 18. an aluminum silicate cotton sliver; 19. a wax liquid outlet; 21. a through hole; 22. a chute; 23. a clamping groove; 41. a card slot; 51. an accommodation hole; 52. an elastic ball; 53. a spring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A dewaxing device, as shown in figure 1, comprises a dewaxing kettle 1, a placing basket 2 for placing a casting shell and a material pushing cart 3 for conveying the placing basket 2 into the dewaxing kettle 1, wherein the dewaxing kettle 1 comprises a furnace body 11, a feed inlet 12 arranged at one end of the furnace body 11 and a cover door 13 for closing and opening the feed inlet 12, the furnace body 11 is provided with a steam generator 14 and an air outlet valve 15 for discharging high-pressure steam, and the lower part of the furnace body 11 is provided with a wax liquid outlet 19 (shown in figure 3); the basket 2 of placing that the pushing equipment 3 will place the foundry goods shell is carried to the effect intracavity, then closes lid door 13, and the produced high-pressure steam of steam generator 14 gives the high temperature high pressure environment of foundry goods shell in the effect intracavity to melt the wax liquid and discharge the wax liquid through wax liquid export 19, can open 15 pressure release of air outlet valve and discharge high-pressure steam behind the discharge wax liquid, thereby accomplish dewaxing process.
In order to avoid excessive pressure in the working chamber, a pressure relief valve 16 is further provided at the upper part of the furnace body 11 as shown in fig. 1.
As shown in fig. 2 and 3, the furnace wall of the furnace body 11 is provided with two spiral channels 17, the spiral channels 17 surround the periphery of the action cavity, the spiral axis of the spiral channels 17 coincides with the axis of the action cavity, the two spiral channels 17 are parallel and staggered along the axial direction of the action cavity, two ends of the spiral channels 17 are respectively communicated with the action cavity and the steam generator 14, one of the spiral channels 17 is communicated with the opening of the action cavity and is positioned at one end of the action cavity, and the other spiral channel 17 is communicated with the opening of the action cavity and is positioned at the other end of the action cavity; high-pressure steam generated by the steam generator 14 enters the action cavity through the spiral channel 17, so that the preheating effect on the inner wall of the action cavity can be achieved; meanwhile, the section of the spiral channel 17 along the radial surface of the action cavity is rectangular, and the length direction of the rectangle is parallel to the axial direction of the action cavity, so that the flow of the high-pressure steam and the contact area of the high-pressure steam and the wall of the action cavity are increased, and the preheating effect is improved.
As shown in fig. 2 and 3, an aluminum silicate sliver 18 is clamped in the furnace wall of the furnace body 11, the aluminum silicate sliver 18 is in a long and flat shape, the aluminum silicate sliver 18 is spirally distributed at the periphery of the spiral channel 17, the spiral pitch of the aluminum silicate sliver 18 is equal to that of the spiral channel 17, the heat preservation effect on the acting cavity can be achieved, the heat loss is reduced, and the double heat preservation layer is formed by the aluminum silicate sliver 18 and the cavity of the spiral channel 17, so that the heat preservation effect is further improved.
As shown in fig. 1, the basket bottom of the placing basket 2 is provided with a plurality of through holes 21 distributed at intervals, so that the wax liquid in the casting shell in the placing basket 2 can be conveniently discharged.
As shown in fig. 4, two angle steel bars i 4 are erected and fixed in the action cavity, the cross section of each angle steel bar i 4 is in an inverted V shape, the length direction of each angle steel bar i 4 is parallel to the axis of the action cavity, a sliding groove 22 (shown in fig. 5) for slidably connecting the upper end surface of each angle steel bar i 4 is formed in the lower end surface of the placing basket 2, and the placing basket 2 can be conveniently placed in or taken out in a transverse direction through the matching of the upper end surface of each angle steel bar i 4 and the sliding groove 22; two angle billet two 5 (see fig. 1) have been erect to pusher 3, two 5 levels of angle billet are placed and the cross-section is the shape of falling V, the up end that one 4 one end of angle billet is close to feed inlet 12 is offered along angle billet 4 length direction and is supplied the lower terminal surface of two 5 one ends of angle billet to the draw-in groove 41 that inlays, during pusher 3 material loading, the lower terminal surface of angle billet two 5 is supported and is inlayed in draw-in groove 41, the butt joint is realized with angle billet one 4 to be convenient for will place basket 2 and slide to angle billet on two 5, accomplish promptly that placing basket 2 on the pusher 3 shifts to the effect intracavity to.
As shown in fig. 5, the upper end surface of the second angle steel bar 5 is provided with a receiving hole 51, an elastic ball 52 is disposed in the receiving hole 51, the elastic ball 52 can be retracted into the receiving hole 51 or extended out of the receiving hole 51, a spring 53 is disposed in the receiving hole 51, two ends of the spring 53 respectively abut against the hole bottom of the receiving hole 51 and the spherical surface of the elastic ball 52, so as to achieve elastic return of the elastic ball 52, and meanwhile, a slot wall of the chute 22 for placing the basket 2 is provided with a clamping slot 23 for clamping the elastic ball 52, so that damping of relative sliding between the placing basket 2 and the second angle steel bar 5 can be increased through clamping of the elastic ball 52 and the clamping slot 23, so as to ensure that the placing basket 2 does not slide relatively when the angle steel bar 5 and the first angle steel bar 4 are in butt collision, and meanwhile, the elastic ball 52 has a certain buffering effect, so as to reduce.
Working principle (refer to fig. 1);
high-pressure steam is introduced into the spiral channel 17, the inner wall of the action cavity can be preheated, and the spiral preheating prolongs the preheating time by prolonging the flow path of the high-pressure steam, so that the preheating effect and the preheating uniformity are improved, the temperature of the inner wall of the action cavity is ensured to be as same as the high-pressure steam as possible when the high-pressure steam enters the action cavity through the spiral channel 17, the pressure loss and the generation of condensed water are reduced, and the breakage of a casting shell and the production cost are reduced; high-pressure steam simultaneously enters the two staggered spiral channels 17 and is gradually preheated from the two ends of the action cavity respectively, compared with the preheating of a single spiral channel 17, the preheating effect of the single spiral channel 17 can be achieved only by half of the preheating time, the preheating speed is accelerated, the preheating uniformity can be increased by the double-layer spiral channel 17 relative to the single spiral channel 17, the preheating effect is improved, meanwhile, the two spiral channels 17 are gradually preheated from the two ends of the action cavity respectively, the temperature difference of the inner wall of the action cavity is enabled to be as small as possible, and the preheating effect is good;
meanwhile, the spiral channel 17 is a cavity distributed on the periphery of the action cavity, which is equivalent to a first heat preservation layer, the aluminum silicate cotton sliver 18 is just positioned on the periphery of the spiral channel 17 and is a second heat preservation layer, and the aluminum silicate cotton sliver 18 and the cavity of the spiral channel 17 form a double heat preservation layer, so that the heat preservation effect is further improved, and the heat loss inside the action cavity is reduced.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws within the scope of the present invention.
Claims (8)
1. A dewaxing device is characterized in that: comprises a dewaxing kettle (1), a placing basket (2) for placing a casting shell and a material pushing trolley (3) for conveying the placing basket (2) into the dewaxing kettle (1); the dewaxing kettle (1) comprises a furnace body (11), a feed inlet (12) formed in one end of the furnace body (11) and a cover door (13) used for closing and opening the feed inlet (12), the furnace body (11) is provided with a steam generator (14) and an air outlet valve (15) used for discharging high-pressure steam, and the lower part of the furnace body (11) is provided with a wax liquid outlet (19); the furnace wall of the furnace body (11) is provided with a spiral channel (17), the spiral channel (17) surrounds the periphery of the action cavity, the axis of a spiral line of the spiral channel (17) coincides with the axis of the action cavity, and two ends of the spiral channel (17) are respectively communicated with the action cavity and the steam generator (14).
2. A dewaxing apparatus according to claim 1, wherein: the number of the spiral channels (17) is two, and the two spiral channels (17) are axially staggered in parallel along the action cavity; one of the spiral channels (17) is communicated with the opening of the action cavity and is positioned at one end of the action cavity, the other spiral channel (17) is communicated with the opening of the action cavity and is positioned at the other end of the action cavity, and the high-pressure steam in the two spiral channels (17) has opposite flow directions.
3. A dewaxing apparatus according to claim 1, wherein: the section of the spiral channel (17) along the radial surface of the action cavity is rectangular, and the length direction of the rectangle is parallel to the axial direction of the action cavity.
4. A dewaxing apparatus according to claim 3, wherein: an aluminum silicate cotton strip (18) is clamped in the furnace wall of the furnace body (11).
5. A dewaxing apparatus according to claim 4, wherein: the aluminum silicate cotton sliver (18) is in a long and flat shape, the aluminum silicate cotton sliver (18) is spirally distributed on the periphery of the spiral channel (17), and the spiral thread pitch of the aluminum silicate cotton sliver (18) is equal to that of the spiral channel (17).
6. A dewaxing apparatus according to claim 1, wherein: the effect intracavity is erect and is equipped with angle billet (4) that the twice level was placed, angle billet (4) are down V-arrangement just the length direction of angle billet (4) is on a parallel with the axle center in effect chamber, the lower terminal surface of placing basket (2) is seted up and is supplied spout (22) that angle billet (4) up end connection of sliding.
7. A dewaxing apparatus according to claim 6, wherein: two angle steel bars (5) with horizontal placement and inverted V-shaped cross sections are erected on the pusher (3), and a clamping groove (41) for abutting against and embedding the lower end face of one end of each angle steel bar (5) is formed in the upper end face of one end, close to the feed inlet (12), of each angle steel bar (4) along the length direction of the corresponding angle steel bar (4).
8. A dewaxing apparatus according to claim 7, wherein: the upper end face of the second angle steel bar (5) is provided with a containing hole (51), an elastic ball (52) which can be retracted into the second angle steel bar (5) or extend out of the second angle steel bar (5) and can be elastically reset is arranged in the containing hole (51), and a clamping groove (23) for clamping and embedding the elastic ball (52) is formed in the groove wall of the sliding groove (22) of the placing basket (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921898813.1U CN210730904U (en) | 2019-11-06 | 2019-11-06 | Dewaxing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921898813.1U CN210730904U (en) | 2019-11-06 | 2019-11-06 | Dewaxing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210730904U true CN210730904U (en) | 2020-06-12 |
Family
ID=70979846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921898813.1U Active CN210730904U (en) | 2019-11-06 | 2019-11-06 | Dewaxing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210730904U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653893A (en) * | 2022-05-23 | 2022-06-24 | 东营福浩精铸科技有限公司 | Dry-type steam dewaxing device and dewaxing method |
-
2019
- 2019-11-06 CN CN201921898813.1U patent/CN210730904U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653893A (en) * | 2022-05-23 | 2022-06-24 | 东营福浩精铸科技有限公司 | Dry-type steam dewaxing device and dewaxing method |
| CN114653893B (en) * | 2022-05-23 | 2023-09-29 | 东营福浩精铸科技有限公司 | Dry type steam dewaxing device and dewaxing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100467166C (en) | Method for founding main regulation valve body of steam turbine | |
| CN210730904U (en) | Dewaxing device | |
| CN109622888B (en) | Casting forming process of complex high-temperature alloy multi-connection guide blade casting | |
| US20200061878A1 (en) | Rotary high speed low compression thermoplastic molding method and apparatus | |
| CN100518993C (en) | Thermal couple protector tube processing technique | |
| CN110180994B (en) | Preparation method of investment casting shell with long and thin blind holes | |
| CN105598390A (en) | Hollow blade ceramic mold and core removal method thereof | |
| CN106853508B (en) | Method for preventing ceramic shell from cracking | |
| KR101387332B1 (en) | Hotpressforming mold with rapid cooling function and cooling method thereof | |
| CN105222564A (en) | Dispellable mould casting drying room | |
| KR101376674B1 (en) | Precision casting method of fauset connector | |
| JP2010075939A (en) | Die-casting die | |
| CN105081228A (en) | Casting process for high-strength and low-alloy chilling spheroidal graphite cast iron camshaft blanks | |
| JP5416515B2 (en) | Casting method using a core | |
| CN107262671A (en) | Lost wax casting technique dewaxing device and method | |
| CN110976770A (en) | Method for eliminating shrinkage cavity in precision casting based on chilling block | |
| CN207057571U (en) | Lost wax casting technique dewaxing device | |
| CN112091173B (en) | Precision investment casting mold and casting method for spiral pump stator | |
| CN104959535B (en) | Tubular Si Taili machine parts'precise casting and molding method | |
| CN107548326B (en) | Core box for producing casting cores | |
| CN110508750A (en) | A kind of interior casting method with partition workpiece of elongated hole | |
| US7238013B2 (en) | Gas cycle apparatus for tire vulcanizer | |
| KR20160136800A (en) | Mold for precision casting and manufacturing method thereof | |
| KR101811776B1 (en) | Method for Casting Refiner Bar Plate and Refiner Bar Plate using the same and Refiner having the same | |
| CN206241209U (en) | Sand structure is penetrated in a kind of type machine plug-in type taper processed |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |