CN110370438A - Automatic control electrical heating PCCP steaming apparatus and maintenance process - Google Patents
Automatic control electrical heating PCCP steaming apparatus and maintenance process Download PDFInfo
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- CN110370438A CN110370438A CN201910703276.9A CN201910703276A CN110370438A CN 110370438 A CN110370438 A CN 110370438A CN 201910703276 A CN201910703276 A CN 201910703276A CN 110370438 A CN110370438 A CN 110370438A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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Abstract
This application involves a kind of PCCP tube core curing means and method field more particularly to a kind of automatic control electrical heating PCCP steaming apparatus and maintenance processes；It includes inner cylinder, outer cylinder, heating tube and Saunas stone；Heating tube is mounted between inner cylinder and outer cylinder, and Saunas clitter is placed in heating tube, the spray head being connected with above Saunas stone at the top of inner cylinder, is equipped with the water supply line being connected with spray head in inner cylinder.Due to implementing above-mentioned technical proposal, the application is heated up by the way that Saunas stone to be placed in heating tube, it recycles spray head to carry out sprinkler operation to Saunas stone and produces steam, Saunas stone uniformly spreads steam to mold between inside and outside cylinder, every mold bottom is installed by a set of the application structure, realize independent control, equipment is installed and used easy to operate, low energy consumption, maintenance hole bottom is without ponding after steam curing, the investment of coal-burning boiler installation, detection and operator are saved, has accomplished low-carbon environment-friendly in use, has met the mandatory requirement of country.
Description
Technical field
This application involves a kind of PCCP tube core curing means and method field more particularly to a kind of automatic control electrical heatings
PCCP steaming apparatus and maintenance process.
Background technique
Currently, domestic PC CP steaming apparatus uses the fire coal and gas fired-boiler of 2t or more substantially.Coal-fired and gas-fired boiler
Furnace is to generate steam by boiler using burning coal and imflammable gas to carry out maintenance PCCP tube core, existing state compulsion provide by
10t and 10t or less coal-burning boiler is gradually eliminated, gas fired-boiler production site many due to nature of production does not have gas source, very
Hardly possible, which is realized, promotes operation.
Summary of the invention
The purpose of the application is to propose a kind of low-carbon environment-friendly, meets state compulsion requirement, saves boiler operating personnel's
Automatic control electrical heating PCCP steaming apparatus and maintenance process.
One of technical solution of the application is achieved in that automatic control electrical heating PCCP steaming apparatus, packet
Include inner cylinder, outer cylinder, heating tube and Saunas stone；Heating tube is mounted between inner cylinder and outer cylinder, and Saunas clitter is placed in heating tube, interior
Cylinder top is connected with the spray head above Saunas stone, is equipped with the water supply line being connected with spray head in inner cylinder.
Further, at least two layers of connector, heating tube are connected between inner cylinder and outer cylinder to be fixedly mounted on by connector
Between inner cylinder and outer cylinder and uniformly it is covered with the cross section between inner cylinder and outer cylinder.
Further, it is connected at the top of pipeline along outer cylinder circumference uniform distribution and at least six spray head for being all located on Saunas stone.
Further, inner cylinder top is delayed outward forms an anti-rising baffle of circle, and the upright projection of outer cylinder is located at anti-rising
Within the scope of the upright projection of baffle, anti-rising baffle outer diameter is 1.2 times to 1.5 times of outer barrel diameter.
Further, inner cylinder overhead height is greater than outer cylinder overhead height, and the height that outer cylinder is higher by heating tube portion is 100 millis
Rice is to 200 millimeters；The height of the low inner cylindrical portion out of outer cylinder is 30 millimeters to 70 millimeters, and inner cylinder bottom end is equipped with line interface, heating
The connection by airtight waterproof of pipe is to line interface；Inner cylinder inner wall is equipped with inclined ring baffle.
Further, inner cylinder is fixedly mounted on die bottom plate center, and internal model, external mold are each attached on die bottom plate and successively
It covers on the outside of outer cylinder.
Further, further include power control cabinet, be equipped with controller in power control cabinet, the digital signal port of controller is connected with control
Button processed, the analog signal port of controller are connected with temperature transmitter, and temperature transmitter is connected with temperature inside detectable inner cylinder
The temperature sensor of degree；The output end of controller is separately connected having heaters and is mounted on the solenoid valve of water supply line；Controller,
Solenoid valve passes through exchange type power and is connected to 220V circuit, and heater is connected by fuse with 220V circuit.
Under the two of the technical solution of the application are achieved in that automatic control electrical heating PCCP steam protecting method includes
State step:
Step 1: inner cylinder, outer cylinder are fixed on die bottom plate center, water supply line, heating tube circuit pass through die bottom plate
It is docked after being pierced by, internal model, external mold are each attached on die bottom plate and are sequentially sleeved on the outside of outer cylinder；
Step 2: tube core is packed into internal model, outer intermode, poured, after casting, beginning is quiet to stop, small for 0.6 between the quiet stopping time
Up to 1.5 hours；
Step 3: internal model, outer mold top lid curing cover, heating tube and spray head are started to work, inner cylinder temperature is at the uniform velocity warming up to 40
DEG C -75 DEG C, heating rate is not more than 22 DEG C/h；
Step 4: constant temperature time is 5 hours to 9 hours, thermostat temperature is 35 DEG C~75 DEG C；
Step 5: monitoring temperature, if discovery temperature is lower than 40 DEG C, heating tube increase operating power until temperature restore to 35 DEG C~
75 DEG C, and extend the thermostatic curing time be 1 hour to 3 hours；
Step 6: heating tube closes work after constant temperature, cooling starts to demould after 1 hour to 3 hours.
Further, in second step between the quiet stopping time it is 0.8 hour to 1.2 hours；Inner cylinder temperature at the uniform velocity heats up in third step
To 45 DEG C -70 DEG C, constant temperature time is 6 hours to 8 hours in the 4th step, and thermostat temperature is 45 DEG C -70 DEG C, and temperature is extensive in the 5th step
Again to 45 DEG C -70 DEG C.
Further, in second step between the quiet stopping time it is 1 hour；Inner cylinder temperature is at the uniform velocity warming up to 65 DEG C in third step, and the 4th
Constant temperature time is 7 hours in step, and thermostat temperature is 65 DEG C, and temperature is restored to 65 DEG C in the 5th step, extends constant temperature in the 5th step and supports
Protecting the time is 1 hour, and temperature fall time is 2 hours in the 6th step.
Due to implementing above-mentioned technical proposal, the application is heated up by the way that Saunas stone to be placed in heating tube, recycles spray head
Sprinkler operation is carried out to Saunas stone and produces steam, and Saunas stone uniformly spreads steam, every cover die to mold between inside and outside cylinder
Have bottom and a set of the application structure is installed, realizes independent control, equipment installs and uses easy to operate, low energy consumption, after steam curing
Maintenance hole bottom saves the investment of coal-burning boiler installation, detection and operator, has accomplished low-carbon environment-friendly in use without ponding,
Meet the mandatory requirement of country.
Detailed description of the invention
The specific structure of the application is provided by drawings and examples below:
Fig. 1 is the structural schematic diagram of the embodiment of the present application 1；
Fig. 2 is 1 scheme of installation of the embodiment of the present application；
Fig. 3 is the controller connection schematic diagram of the embodiment of the present application 1；
Fig. 4 is the power supply connection schematic diagram of the embodiment of the present application 1.
Legend: 1. inner cylinders, 2. outer cylinders, 3. heating tubes, 4. Saunas stones, 5. water supply lines, 6. connectors, 7. anti-upper upshifts
Plate, 8. line interfaces, 9. ring baffles, 10. die bottom plates, 11. internal models, 12. external molds, 13. power control cabinets, 14. controllers, 15.
Control button, 16. temperature transmitters, 17. temperature sensors, 18. solenoid valves, 19. exchange type powers.
Specific embodiment
The application is not limited by following embodiments, can be determined according to the technical solution of the application and actual conditions specific
Embodiment.
Embodiment 1, as shown in Figure 1, 2, automatic control electrical heating PCCP steaming apparatus include inner cylinder 1, outer cylinder 2, add
Heat pipe 3 and Saunas stone 4；Heating tube 3 is mounted between inner cylinder 1 and outer cylinder 2, and Saunas stone 4 is deposited in heating tube 3,1 top of inner cylinder
It is connected with the spray head for being located at 4 top of Saunas stone, is equipped with the water supply line 5 being connected with spray head in inner cylinder 1.
Heating tube 3 is that (carbon steel pipe, titanium tube, stainless steel tube, copper pipe) is packed into heating wire, gap section in seamless metal pipe
The draw forms after being filled with thermal conductive resin and the magnesia powder of insulating properties, is reprocessed into various shape required for user.Add
Heat pipe 3 can be divided into two or more groups, can individually be heated in this way, combined heated, the work such as intermittent-heating, improve heating tube
While 3 service life, it is also convenient for temperature control.
Saunas stone 4 is deposited in heating tube 3 and heats up, and recycles spray head to carry out sprinkler operation to Saunas stone 4 and produces steam, mulberry
It is convenient for uniformly spreading steam to internal model 11, external mold 12 between inside and outside cylinder by stone 4.A set of the application is installed every mold bottom
Structure realizes independent control.
Table 1 be production DN1800 tubing cost consumption, by table 1 it can be concluded that, no matter from equipment purchasing, using consumption with
And installation difficulty and expense, the correlative charges of the application will be lower than traditional coal-burning boiler.It ensure that quality reaches national mark
It is quasi- and under the premise of reducing pollution to environment, production efficiency is improved, concrete curing innovation has been carried out, suitable for popularizing.
As shown in Figure 1, 2, at least two layers of connector 6 is connected between inner cylinder 1 and outer cylinder 2, heating tube 3 is solid by connector 6
Dingan County is mounted between inner cylinder 1 and outer cylinder 2 and is uniformly covered with the cross section between inner cylinder 1 and outer cylinder 2.
Saunas stone 4 is easier to stack in heating tube 3 in this way, and area of heat transfer is big, high-efficient.
As shown in Figure 1, 2, it is connected at the top of pipeline along 2 circumference uniform distribution of outer cylinder and at least six spray for being all located on Saunas stone 4
Head.Spray head is subject to energy spraying range without departing from Saunas stone 4.The sprinkling boundary of two adjacent spray heads is tangent or a small amount of intersections
It is advisable, general quantity can be 8 or 12.
As shown in Figure 1, 2,1 top of inner cylinder is delayed outward forms an anti-rising baffle 7 of circle, and the upright projection of outer cylinder 2 is located at
Within the scope of the anti-upright projection for rising baffle 7, anti-rising 7 outer diameter of baffle is 1.2 times to 1.5 times of 2 diameter of outer cylinder.
The steam rate of climb that Saunas stone 4 avoidable in this way generates is too fast, is not enough to the heating of mold lower part.
As shown in Figure 1, 2,1 overhead height of inner cylinder is greater than 2 overhead height of outer cylinder, and outer cylinder 2 is higher by the height of 3 part of heating tube
It is 100 millimeters to 200 millimeters；The height of low 1 part of inner cylinder out of outer cylinder 2 is 30 millimeters to 70 millimeters, and 1 bottom end of inner cylinder is equipped with route
Interface 8, the connection by airtight waterproof of heating tube 3 to line interface 8；1 inner wall of inner cylinder is equipped with inclined ring baffle
9。
Outer cylinder 2 is higher by the part of heating tube 3 convenient for the fixation that stacks of Saunas stone 4, and the part of the low inner cylinder 1 out of outer cylinder 2 is convenient for
It is welded and fixed with die bottom plate 10.The reserved draining aperture (not shown) in 10 center of die bottom plate, ring baffle 9 can avoid cold
Condensate slides along 1 inner wall of inner cylinder influences line interface 8, and condensed water, which can fall, to fall along ring baffle 9 eventually by draining
Aperture discharge, it is ensured that hole bottom is without ponding after tube core maintenance.
As shown in Figure 1, 2, inner cylinder 1 is fixedly mounted on 10 center of die bottom plate, and internal model 11, external mold 12 are each attached to mold bottom
On plate 10 and it is sequentially sleeved in 2 outside of outer cylinder.
For every mold, a set of the application is installed in welding on the die bottom plate 10 of the inside of internal model 11, electricity consumption and
It is all accessed below die bottom plate 10 with water line, is according to circumstances uniformly connected in control room, be convenient for maintenance operations, maintenance
Shi Bixu uses curing cover, and in addition to reserved draining aperture, and 10 surrounding gap of die bottom plate, which all blocks, guarantees mould inside
Sealing.Every mold individually controls, low energy consumption, and maintenance hole bottom saves coal-burning boiler installation, detection without ponding after steam curing
And the investment of operator.
As shown in Figure 3,4, automatic control electrical heating PCCP steaming apparatus further includes power control cabinet 13, is set in power control cabinet 13
There is controller 14, the digital signal port of controller 14 is connected with control button 15, the analog signal port connection of controller 14
There is temperature transmitter 16, temperature transmitter 16 is connected with the temperature sensor 17 of detectable 1 internal temperature of inner cylinder；Controller 14
Output end is separately connected having heaters and is mounted on the solenoid valve 18 of water supply line 5；Controller 14, solenoid valve 18 pass through exchange
Formula power supply 19 is connected to 220V circuit, and heater is connected by fuse with 220V circuit.
Controller 14 is programmed, which belongs to existing public technology.Controller 14 can be according to temperature
The analog signal that transmitter 16 exports is judged；The starting of heater is controlled respectively, is stopped working and solenoid valve 18 opens
It moves, stop working, to realize the work such as heating, constant temperature, realize maintenance work automation, whole process operating personnel need to only open
Open, close control button 15 after be monitored, operating process is simple, significantly saves manpower financial capacity.
Embodiment 2, automatic control electrical heating PCCP steam protecting method include the following steps: step 1: by inner cylinder 1, outer
Cylinder 2 is fixed on 10 center of die bottom plate, and water supply line 5,3 circuit of heating tube dock after being pierced by by die bottom plate 10, interior
Mould 11, external mold 12 are each attached on die bottom plate 10 and are sequentially sleeved in 2 outside of outer cylinder；Step 2: tube core is packed into internal model 11, outer
It between mould 12, is poured, it is 0.6 hour to 1.5 hours between the quiet stopping time that after casting, beginning is quiet, which to stop,；Step 3: internal model 11,
12 top cover curing cover of external mold, heating tube 3 and spray head are started to work, and 1 temperature of inner cylinder is at the uniform velocity warming up to 40 DEG C -75 DEG C, heating
Speed is not more than 32 DEG C/h；Step 4: constant temperature time is 5 hours to 9 hours, thermostat temperature is 35 DEG C~75 DEG C；5th
Step: monitoring temperature, if discovery temperature is lower than 40 DEG C, the increase operating power of heating tube 3 restores up to temperature to 35 DEG C~75 DEG C, and
Extending the thermostatic curing time is 1 hour to 3 hours；Step 6: heating tube 3 closes work after constant temperature, cool down 1 hour to 3
Start to demould after hour.
Embodiment 3, automatic control electrical heating PCCP steam protecting method include the following steps: step 1: by inner cylinder 1, outer
Cylinder 2 is fixed on 10 center of die bottom plate, and water supply line 5,3 circuit of heating tube dock after being pierced by by die bottom plate 10, interior
Mould 11, external mold 12 are each attached on die bottom plate 10 and are sequentially sleeved in 2 outside of outer cylinder；Step 2: tube core is packed into internal model 11, outer
It between mould 12, is poured, it is 0.8 hour to 1.2 hours between the quiet stopping time that after casting, beginning is quiet, which to stop,；Step 3: internal model 11,
12 top cover curing cover of external mold, heating tube 3 and spray head are started to work, and 1 temperature of inner cylinder is at the uniform velocity warming up to 45 DEG C -70 DEG C, heating
Speed is not more than 32 DEG C/h；Step 4: constant temperature time is 6 hours to 8 hours, thermostat temperature is 45 DEG C~70 DEG C；5th
Step: monitoring temperature, if discovery temperature is lower than 40 DEG C, the increase operating power of heating tube 3 restores up to temperature to 45 DEG C~70 DEG C, and
Extending the thermostatic curing time is 1 hour to 3 hours；Step 6: heating tube 3 closes work after constant temperature, cool down 1 hour to 3
Start to demould after hour.
Embodiment 4, automatic control electrical heating PCCP steam protecting method include the following steps: step 1: by inner cylinder 1, outer
Cylinder 2 is fixed on 10 center of die bottom plate, and water supply line 5,3 circuit of heating tube dock after being pierced by by die bottom plate 10, interior
Mould 11, external mold 12 are each attached on die bottom plate 10 and are sequentially sleeved in 2 outside of outer cylinder；Step 2: tube core is packed into internal model 11, outer
It between mould 12, is poured, it is 1 hour between the quiet stopping time that after casting, beginning is quiet, which to stop,；Step 3: internal model 11,12 top of external mold
Lid curing cover, heating tube 3 and spray head are started to work, and 1 temperature of inner cylinder is at the uniform velocity warming up to 65 DEG C, heating rate no more than 32 DEG C/
Hour；Step 4: constant temperature time is 7 hours, thermostat temperature is 65 DEG C；Step 5: monitoring temperature, if discovery temperature is lower than 40
DEG C, heating tube 3 increase operating power until temperature restore to 65 DEG C, and extend the thermostatic curing time be 1 hour；Step 6: permanent
After temperature, heating tube 3 closes work, and cooling starts to demould after 2 hours.
Curing time between the quiet stopping time, the heating-up time, constant temperature time, temperature fall time summation.
Table 2 is that the single required consumption of tubing is conserved using the application, and table 3 is the application developmental tube and the test block of natural curing pipe
Intensity contrast；By table 2, table 3 it can be concluded that, limit temperature be 65 DEG C, maintenance 10 hours under the conditions of, tubing various aspects after maintenance
Standard requirements are able to satisfy, the consumption amount that limit temperature is 75 DEG C is than the consumption costs rise about 10% to 80% that limit temperature is 65 DEG C.
Table 4 is temperature test of first group of tube core at 65 DEG C of limit temperature, and table 5 is first group of tube core strength test value；Table 6 is
Temperature test of second group of tube core at 65 DEG C of limit temperature, table 5 is second group of tube core strength test value；By being supported known to table 5, table 6
PCCP tube core everyway after shield is able to satisfy standard requirements, solves coal-burning boiler environmental pollution, low-carbon environmental protection again.
The above technical characteristic constitutes embodiments herein, can basis with stronger adaptability and implementation result
Actual needs increases and decreases inessential technical characteristic, to meet the needs of different situations.
Table 1:
Table 2:
Table 3
Table 4
Table 5
Table 6
Table 7
Claims (10)
1. a kind of automatic control electrical heating PCCP steaming apparatus, it is characterised in that: including inner cylinder, outer cylinder, heating tube and mulberry
By stone；Heating tube is mounted between inner cylinder and outer cylinder, and Saunas clitter is placed in heating tube, is connected at the top of inner cylinder positioned at Saunas stone
The spray head of top, inner cylinder is interior to be equipped with the water supply line being connected with spray head.
2. automatic control electrical heating PCCP steaming apparatus according to claim 1, it is characterised in that: inner cylinder and outer cylinder
Between be connected at least two layers of connector, in heating tube is fixedly mounted between inner cylinder and outer cylinder by connector and is uniformly covered with
Cross section between cylinder and outer cylinder.
3. automatic control electrical heating PCCP steaming apparatus according to claim 1 or 2, it is characterised in that: pipeline top
Portion is connected with along outer cylinder circumference uniform distribution and at least six spray head for being all located on Saunas stone.
4. automatic control electrical heating PCCP steaming apparatus according to claim 3, it is characterised in that: inner cylinder top to
Outer delay forms an anti-rising baffle of circle, and the upright projection of outer cylinder is located within the scope of the anti-upright projection for rising baffle, anti-rising
Baffle outer diameter is 1.2 times to 1.5 times of outer barrel diameter.
5. automatic control electrical heating PCCP steaming apparatus according to claim 4, it is characterised in that: high at the top of inner cylinder
Degree is greater than outer cylinder overhead height, and the height that outer cylinder is higher by heating tube portion is 100 millimeters to 200 millimeters；The low inner cylinder portion out of outer cylinder
The height divided is 30 millimeters to 70 millimeters, and inner cylinder bottom end is equipped with line interface, the connection by airtight waterproof of heating tube
To line interface；Inner cylinder inner wall is equipped with inclined ring baffle.
6. automatic control electrical heating PCCP steaming apparatus described according to claim 1 or 2 or 4 or 5, it is characterised in that:
Inner cylinder is fixedly mounted on die bottom plate center, and internal model, external mold are each attached on die bottom plate and are sequentially sleeved on the outside of outer cylinder.
7. automatic control electrical heating PCCP steaming apparatus described according to claim 1 or 2 or 4 or 5, it is characterised in that:
Further include power control cabinet, is equipped with controller in power control cabinet, the digital signal port of controller is connected with control button, the mould of controller
Quasi- signal port is connected with temperature transmitter, and temperature transmitter is connected with the temperature sensor of detectable inner cylinder internal temperature；Control
The output end of device processed is separately connected having heaters and is mounted on the solenoid valve of water supply line；Controller, solenoid valve pass through exchange
Formula power supply is connected to 220V circuit, and heater is connected by fuse with 220V circuit.
8. a kind of automatic control electrical heating PCCP steam protecting method, it is characterised in that: include the following steps:
Step 1: inner cylinder, outer cylinder are fixed on die bottom plate center, water supply line, heating tube circuit pass through die bottom plate
It is docked after being pierced by, internal model, external mold are each attached on die bottom plate and are sequentially sleeved on the outside of outer cylinder；
Step 2: tube core is packed into internal model, outer intermode, poured, after casting, beginning is quiet to stop, small for 0.6 between the quiet stopping time
Up to 1.5 hours；
Step 3: internal model, outer mold top lid curing cover, heating tube and spray head are started to work, inner cylinder temperature is at the uniform velocity warming up to 40
DEG C -75 DEG C, heating rate is not more than 22 DEG C/h；
Step 4: constant temperature time is 5 hours to 9 hours, thermostat temperature is 35 DEG C~75 DEG C；
Step 5: monitoring temperature, if discovery temperature is lower than 40 DEG C, heating tube increase operating power until temperature restore to 35 DEG C~
75 DEG C, and extend the thermostatic curing time be 1 hour to 3 hours；
Step 6: heating tube closes work after constant temperature, cooling starts to demould after 1 hour to 3 hours.
9. automatic control electrical heating PCCP steam protecting method according to claim 6, it is characterised in that: quiet in second step
It is 0.8 hour to 1.2 hours between stopping time；Inner cylinder temperature is at the uniform velocity warming up to 45 DEG C -70 DEG C in third step, constant temperature time in the 4th step
It is 6 hours to 8 hours, thermostat temperature is 45 DEG C -70 DEG C, and temperature is restored to 45 DEG C -70 DEG C in the 5th step.
10. automatic control electrical heating PCCP steam protecting method, feature described according to claim 1 or 2 or 4 or 5 or 7 exist
In: it is 1 hour between the quiet stopping time in second step；Inner cylinder temperature is at the uniform velocity warming up to 65 DEG C in third step, and constant temperature time is 7 in the 4th step
Hour, thermostat temperature is 65 DEG C, and temperature is restored to 65 DEG C in the 5th step, and extending the thermostatic curing time in the 5th step is 1 hour, the
Temperature fall time is 2 hours in six steps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910703276.9A CN110370438A (en) | 2019-07-31 | 2019-07-31 | Automatic control electrical heating PCCP steaming apparatus and maintenance process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910703276.9A CN110370438A (en) | 2019-07-31 | 2019-07-31 | Automatic control electrical heating PCCP steaming apparatus and maintenance process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113547624A (en) * | 2021-07-26 | 2021-10-26 | 河北新兴铸管有限公司 | Nodular cast iron health preserving device |
-
2019
- 2019-07-31 CN CN201910703276.9A patent/CN110370438A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113547624A (en) * | 2021-07-26 | 2021-10-26 | 河北新兴铸管有限公司 | Nodular cast iron health preserving device |
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