Sampling device used after wire feeding of vermicular graphite cast iron cover ladle and vermicularizing analysis method thereof

Abstract

The invention belongs to the technical field of cast iron thermal analysis, and particularly relates to a sampling device used after wire feeding of a vermicular graphite cast iron cover ladle and a vermicularizing analysis method thereof.The sampling device is characterized by comprising a base, a translation seat, a sampling rod, a lifting driver, a controller and a thermal analyzer, the translation seat is movably connected with the base, and the lifting driver is arranged above the translation seat; the lifting driver is movably connected with the sampling rod; the bottom of the sampling rod is connected with the immersion type sampling cup through the cup body joint seat; a controller and a thermal analyzer are arranged at the end part of the base; the base is arranged on the top of the vermicular graphite cast iron wire feeding work station, the ladle is arranged below the vermicular graphite cast iron wire feeding work station, and a sampling hole is formed in the wire feeding ladle cover. The method has the beneficial effects that on the premise that a wire feeding ladle cover is not opened, sampling is directly carried out in the ladle, thermal analysis is synchronously completed, and the problems that in traditional sampling, due to the molten iron transferring and pouring process, vermicularizing elements in molten iron are seriously oxidized, and the vermicularizing effect evaluation accuracy is low are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of cast iron thermal analysis, and in particular relates to a sampling device for a vermicular graphite cast iron cap after wire feeding and a creepage analysis method thereof. Background Art

[0002] In order to make the carbon element in the vermicular cast iron form vermicular graphite after the molten iron solidifies, the original molten iron needs to be vermicularized and inoculated. The vermicularization process window of vermicular cast iron is narrow. Excessive vermicularizing agent will cause the graphite to be spherical, while too little vermicularizing agent will lead to the formation of a large amount of flake graphite. Therefore, it is very difficult to prepare castings with good vermicularization effect in actual production.

[0003] In order to improve the creeping effect of molten iron, the creeping treatment process generally involves first adding a certain amount of creeping agent to the original molten iron through the flushing method or the cover wire feeding method, then sampling the molten iron after creeping and evaluating the creeping effect through thermal analysis, and then using the creeping effect thermal analysis results to determine whether the molten iron can be directly used for casting. When the analysis results show that the creeping is insufficient, the operator needs to determine the amount of creeping agent to be added based on the creeping effect obtained by thermal analysis, and then adjust the creeping of the molten iron through the cover wire feeding creeping method. In this creeping treatment process, the sampling thermal analysis of the creeping molten iron often needs to be repeated many times.

[0004] In the above-mentioned creep treatment process, the traditional molten iron sampling process is relatively complicated. It is necessary to open the wire feeding bag cover first, and then pour the creep treated molten iron into the thermal analysis sample cup through manual transfer. Finally, it is determined whether the molten iron needs to continue to be fed with wires according to the creep effect of the molten iron obtained by thermal analysis. When it is necessary to further adjust the creep effect through wire feeding, it is necessary to close the wire feeding bag cover again, and then perform the wire feeding process. The process is cumbersome and has a long cycle. The manual molten iron transfer and pouring during the sampling process will also cause serious oxidation of the creep elements in the molten iron. The pouring weight of the molten iron in the sample cup also varies greatly due to manual operation, which ultimately results in low accuracy in the evaluation of the creep effect of the molten iron. In addition, there are certain safety risks in the manual sampling process. Therefore, in order to simplify the molten iron sampling thermal analysis process, reduce the oxidation of molten iron during sampling, and improve the operational safety and the accuracy of the analysis of the creep effect of molten iron, it is necessary to design a mechanized sampling device that can realize direct sampling thermal analysis without opening the bag cover after wire feeding.

[0005] The Chinese invention with application number 202010786089.4 discloses an automatic molten steel sampling device and a sampling method, including a mobile main body, a support frame is provided on the mobile main body, a slide bar is movably provided on the support frame, the slide bar moves forward and backward and left and right on the support frame, a sampling unit is provided at the front end of the slide bar, and the sampling unit can deflect relative to the slide bar; the sampling unit includes a sampling rod and a sampler arranged at the bottom of the sampling rod, the top of the sampling rod is connected to a power device, and the power device drives the sampling rod forward and backward; the stripping unit includes a sample collection box, a cantilever platform is provided above the sample collection box, a stripping hole is provided on the cantilever platform, and the stripping hole is directly opposite to the sample collection box. In this scheme, the sampled sample is controlled by the control system to collide with the sampler and the stripping hole, so that the sample can be automatically stripped from the sampler and fall into the sample collection box to avoid contamination of the sample. This impact stripping scheme has a damaging effect on the power device. In addition, there is a lack of real-time analysis means for the creeping effect of molten iron, which is not conducive to the rapid decision-making of whether further wire feeding treatment is needed, affecting production efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a sampling device for a vermicular graphite cast iron cover after wire feeding and a creep analysis method thereof, so as to overcome the shortcomings of the prior art. On the premise that the wire feeding cover is not opened after the wire feeding creep treatment, samples are directly taken from the molten iron ladle and thermal analysis is completed synchronously, so as to realize mechanized sampling of an immersion sampling cup, eliminate the problems of severe oxidation of molten iron and inconsistent pouring conditions caused by manual transfer and pouring sampling; quickly detect the temperature of the molten iron in the sampling cup, eliminate the problem of the temperature induced by the thermocouple in the traditional sandy sample cup being out of sync with the actual molten iron temperature, and improve the accuracy of the thermal analysis results of the creep effect; the immersion sampling cup can realize automatic clamping and shedding, and increase the convenience of installing and disassembling the sample cup.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] One of the technical solutions: a sampling device for a vermicular cast iron cover after wire feeding, comprising a base, a translation seat, a sampling rod, a lifting drive, a controller and a thermal analyzer, wherein the translation seat is movably connected to the base, a lifting drive is arranged above the translation seat, the lifting drive is movably connected to the sampling rod, and the bottom of the sampling rod is connected to an immersion sampling cup through a cup body joint seat; the interior of the sampling rod is hollow to form a wire channel, a wire adapter seat is arranged at the bottom of the sampling rod, a thermocouple adapter and a liquid level adapter are arranged on the wire adapter seat; the cup body joint seat is provided with a seat body, a thermocouple probe, A liquid level electrode and a clamp, the clamp is clamped with the outer ring groove of the wire adapter seat, and a thermocouple probe and a liquid level electrode are distributed on the seat body, and the thermocouple probe and the liquid level electrode correspond to the positions of the thermocouple adapter and the liquid level adapter on the wire adapter seat respectively; the immersion sampling cup includes a cup body, and a buckle is provided on the upper edge of the cup body, and the buckle is clamped with the outer ring groove of the cup body joint seat; a controller and a thermal analyzer are provided at the end of the base; the base is arranged on the top of the vermicular graphite cast iron wire feeding workstation, the molten iron ladle is arranged below the vermicular graphite cast iron wire feeding workstation, and a sampling hole is provided on the wire feeding ladle cover.

[0009] Furthermore, a sample cup rack is provided at one end of the base, including a sample cup seat and a release baffle. The sample cup seat is a round hole-shaped cup seat, and the diameter matches the outer diameter of the immersion sampling cup. The release baffle is provided with a U-shaped long hole, and the width of the U-shaped long hole is smaller than the outer diameter of the clamp of the cup body joint seat.

[0010] Furthermore, the base is provided with position sensors corresponding to the sampling position and the tripping position respectively.

[0011] Furthermore, the sampling rod is provided with limit switches, which are respectively corresponding to the upper limit position and the lower limit position.

[0012] Furthermore, the seat body and the clamp of the cup body joint seat are integrally stamped from a low-carbon steel plate with a thickness of 0.8-1.5mm, and the cup body and the buckle of the immersion sampling cup are integrally stamped from a low-carbon steel plate with a thickness of 0.8-1.5mm; after the cup body joint seat and the immersion sampling cup are assembled together, a refractory coating is applied on the outer surface.

[0013] Furthermore, the thermocouple probe is a K-type fast thermocouple with an outer diameter of 4 to 5 mm; the model of the thermal analyzer is PD-GD.

[0014] Furthermore, the translation seat is a linear motor module; and the lifting drive is a rack lifting mechanism.

[0015] Furthermore, two ends of the base are provided with a first safety travel switch and a second safety travel switch.

[0016] Furthermore, the PLC in the controller is respectively connected to the translation motor driver, the lifting motor driver, the thermocouple, the thermal analyzer, the liquid level electrode switch, the upper limit switch of the sampling rod, the lower limit switch of the sampling rod, the safety travel switch 1 and the safety travel switch 2, the sampling position travel switch and the tripping position travel switch, the translation motor driver is connected to the translation servo motor, and the lifting motor driver is connected to the lifting servo motor; the thermal analyzer communicates with the PLC according to the MELSEC protocol.

[0017] Technical solution 2: A method for analyzing the creepage of a vermicular graphite cast iron cap after feeding wire, the specific steps are as follows:

[0018] 1) Connect the sampling cup, place the immersion sampling cup in the sample cup seat of the sample cup rack, connect the bottom of the sampling rod to the cup body joint seat in advance, and control the sampling rod to rise to the upper limit position, then translate it to the sampling position above the sample cup rack, and move the sampling rod downward until the cup body joint seat and the sampling rod are installed;

[0019] 2) The sampling position is in place, the sampling rod moves up 100-250mm, and then moves in the opposite direction to reach the top of the sampling hole;

[0020] 3) Sampling: When the molten iron wire feeding is finished, the sampling rod is controlled to descend, and the immersion sampling cup passes through the sampling hole into the molten iron ladle. When the liquid level electrode contacts the molten iron, the stop descending signal is triggered, the sampling rod stops moving downward, and the molten iron is poured into the immersion sampling cup, completing the sampling;

[0021] 4) Solidification at room temperature, the sampling rod rises until the immersion sampling cup reaches above the wire feeding workstation, stops rising, the molten iron sample cools down and solidifies, the thermocouple obtains the temperature of the molten iron sample and transmits it to the thermal analyzer, the thermal analyzer extracts the temperature curve of the molten iron sample during the solidification and cooling process and performs differential processing on it, performs thermal analysis by identifying the characteristic points of the temperature curve and the differential curve, and obtains the creeping effect of the molten iron;

[0022] 5) After the sample cup is detached and the thermal analysis is completed, the sampling rod moves to the tripping position of the sample cup rack, the immersion sampling cup and the cup body joint seat enter the U-shaped long hole on the tripping baffle, the sampling rod is lifted up, and the immersion sampling cup and the cup body joint seat fall off the sampling rod due to the obstruction of the tripping baffle. The operator determines whether the molten iron package needs to continue wire feeding or be directly used for casting according to the results of the creep effect analysis, and the molten iron sampling thermal analysis process is completed.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) After the wire feeding and creep treatment is completed, the sample is directly taken from the molten iron ladle and the thermal analysis is completed synchronously without opening the wire feeding ladle cover. The molten iron does not need to be transported using a sampling spoon. The sampling of the molten iron is completed in the immersion sampling cup from the beginning to the cooling and solidification of the sampled molten iron. This avoids the problems of severe oxidation of creeping elements in the molten iron and low accuracy of creeping effect evaluation caused by the molten iron transportation and pouring process during traditional sampling;

[0025] 2) By controlling the lifting and lowering of the sampling rod, the mechanized sampling of the immersion sampling cup is realized, eliminating the problems of inconsistent pouring conditions and sampling weight caused by manual transfer pouring sampling, increasing the safety during sampling, and reducing the time the ladle is exposed to the air and the time required for opening and closing the ladle cover;

[0026] 3) The rapid thermocouple probe in the sample cup is used to detect the temperature of the molten iron in the sampling cup, eliminating the chilling of the traditional sandy sample cup, eliminating the problem that the temperature induced by the thermocouple in the traditional sandy sample cup is out of sync with the actual molten iron temperature, and improving the accuracy of the creep effect thermal analysis results;

[0027] 4) The immersion sampling cup can be automatically loaded and unloaded, and the operation process is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of an embodiment of a sampling device after the vermicular graphite cast iron cover is fed with wires according to the present invention;

[0029] Figure 2 It is a schematic diagram of the implementation state of an embodiment of the present invention;

[0030] Figure 3 1 / 4 cross-sectional structural diagram of the bottom end of the sampling rod in an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the connection state between the immersion sampling cup and the cup body joint seat in the embodiment of the present invention;

[0032] Figure 5 yes Figure 4 1 / 4 cross-sectional structural diagram;

[0033] Figure 6 Schematic diagram of the effect of the immersion sampling cup being mounted on the sampling rod in the embodiment of the present invention;

[0034] Figure 7 It is a control system block diagram of an embodiment of the present invention.

[0035] In the figure: 1-base; 101-sampling position travel switch; 102-tripping position travel switch; 103-safety travel switch 1; 104-safety travel switch 2; 2-translation seat; 3-lifting drive; 4-sampling rod; 401-wire adapter seat; 402-thermocouple adapter; 403-liquid level adapter; 404-thermocouple compensation wire; 405-liquid level wire; 406-upper limit switch; 407-lower limit switch; 5-cup body Connector seat; 501-seat body; 502-thermocouple probe; 503-liquid level electrode; 504-clamp; 6-immersion sampling cup; 601-cup body; 602-clip; 7-sample cup rack; 701-sample cup seat; 702-trip baffle; 8-drag chain trough; 9-controller; 10-thermal analyzer; 11-wire feeding workstation; 12-wire feeding bag cover; 121-sampling hole; 122-wire feeding tube; 13-iron ladle; 14-wire feeding device; DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0038] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the invention claimed, but only represents selected embodiments of the present invention.

[0039] See Figure 1-Figure 6, is a schematic diagram of the structure of an embodiment of a sampling device for a vermicular cast iron cap after wire feeding of the present invention, comprising a base 1, a translation seat 2, a lifting driver 3, a sampling rod 4, a controller 9 and a thermal analyzer 10, the translation seat 2 is movably connected to the base 1, a lifting driver 3 is arranged above the translation seat 2, the lifting driver 3 is movably connected to the sampling rod 4, a rack is arranged on the outer surface of the sampling rod 4, and the bottom of the sampling rod 4 is connected to the immersion sampling cup 6 through the cup body joint seat 5; the interior of the sampling rod 4 is hollow to form a wire channel, a wire adapter seat 401 is arranged at the bottom of the sampling rod 4, and a thermocouple adapter 402 and a liquid level adapter 403 are arranged on the wire adapter seat 401. The thermocouple compensation wire 404 is connected to the thermocouple adapter 402, the liquid level wire 405 is connected to the liquid level adapter 403, the wire is led out from the top of the sampling rod 4, and connected to the controller 9 through the drag chain wire slot 8.

[0040] The cup body joint seat 5 is provided with a seat body 501, a thermocouple probe 502, a liquid level electrode 503 and a clamp 504, the clamp 504 is clamped with the outer peripheral groove of the wire adapter seat 401, the seat body 501 is provided with a thermocouple probe 502 and a liquid level electrode 503, and the thermocouple probe 502 and the liquid level electrode 503 correspond to the positions of the thermocouple adapter 402 and the liquid level adapter 403 on the wire adapter seat 401. The thermocouple probe 502 is a K-type fast thermocouple with an outer diameter of 4 to 5 mm.

[0041] The immersion sampling cup 6 includes a cup body 601, and a buckle 602 is provided on the upper edge of the cup body 601; a controller 9 and a thermal analyzer 10 are provided at the end of the base 1; the base 1 is arranged on the top of the vermicular graphite cast iron wire feeding workstation 11, and the ladle 13 is arranged below the vermicular graphite cast iron wire feeding workstation 11, and a sampling hole 121 is provided on the wire feeding bag cover 12. The wire feeding bag cover 12 and the vermicular graphite cast iron wire feeding workstation 11 are connected through a wire feeding tube 122, and the vermicular graphite cast iron wire feeding workstation 11 is provided with a wire feeding device 14 and a bobbin.

[0042] A sample cup rack 7 is provided at one end of the base 1, including a sample cup seat 701 and a release baffle 702. The sample cup seat 701 is a round hole-shaped cup seat, and the diameter matches the outer diameter of the immersion sampling cup 6. The release baffle 702 is provided with a U-shaped long hole, and the width of the U-shaped long hole is smaller than the outer diameter of the clamp 504 on the cup body joint seat 5.

[0043] The base 1 is provided with a sampling position travel switch 101 and a tripping position travel switch 102, which correspond to the sampling position and the tripping position respectively. The two ends of the base 1 are provided with a safety travel switch 1 103 and a safety travel switch 2 104. The sampling rod 4 is provided with an upper limit switch 406 and a lower limit switch 407. The upper limit switch 406, the lower limit switch 407, the safety travel switch 1 103 and the safety travel switch 2 104 can prevent derailment due to misoperation.

[0044] The seat body 501 and the clamp 504 are integrally stamped from low-carbon steel plates, the cup body 601 and the buckle 602 are integrally stamped from low-carbon steel plates, and the thickness of the low-carbon steel plates is 0.8-1.5 mm; after the cup body joint seat 5 and the immersion sampling cup 6 are clamped together, a refractory coating is applied on the outer surface to prevent the immersion sampling cup 6 from melting during the sampling process.

[0045] In the embodiment, the translation seat 2 is a standard linear slide module, and the lifting drive 3 is a rack lifting mechanism. The model of the thermal analyzer 10 is PD-GD.

[0046] See Figure 7 The PLC in the controller 9 is respectively connected to the translation motor driver, the lifting motor driver, the thermocouple, the thermal analyzer, the liquid level electrode switch, the upper limit switch of the sampling rod, the lower limit switch of the sampling rod, the safety travel switch 1 and the safety travel switch 2, the sampling position travel switch and the tripping position travel switch, the translation motor driver is connected to the translation servo motor, and the lifting motor driver is connected to the lifting servo motor; the thermal analyzer communicates with the PLC according to the MELSEC protocol.

[0047] When the sampling and analysis method of the vermicular graphite cast iron cap after feeding wire is implemented, the specific steps are as follows:

[0048] 1) Connect the sampling cup, place the immersion sampling cup 6 in the sample cup seat 701 of the sample cup rack 7, the bottom of the sampling rod 4 is pre-connected with the cup body joint seat 5, the controller 9 controls the sampling rod 4 to rise to the upper limit position, and then translates it to the sampling position above the sample cup rack 7, and the sampling rod 4 moves down until the cup body joint seat 5 and the sampling rod 4 are clamped;

[0049] 2) The sampling position is in place, the sampling rod 4 moves up 100-250 mm, and then moves in the opposite direction to reach the top of the sampling hole 121;

[0050] 3) Sampling: When the molten iron wire feeding is finished, the sampling rod 4 is controlled to descend, and the immersion sampling cup 6 passes through the sampling hole 121 and enters the molten iron ladle 13. When the liquid level electrode 503 contacts the molten iron, a closed loop is formed, and a stop descending signal is triggered. The sampling rod 4 stops moving downward, and the molten iron is poured into the immersion sampling cup 6, and the sampling is completed;

[0051] 4) Solidification at room temperature, the sampling rod 4 rises until the immersion sampling cup 6 reaches above the wire feeding workstation 11, stops rising, the molten iron sample cools down and solidifies, the thermocouple probe 502 obtains the temperature of the molten iron sample and transmits it to the thermal analyzer 10, the thermal analyzer 10 extracts the temperature curve of the molten iron sample during the solidification and cooling process and performs differential processing on it, and performs thermal analysis by identifying the characteristic points of the temperature curve and the differential curve to obtain the creeping effect of the molten iron;

[0052] 5) After the sample cup is detached and the thermal analysis is completed, the sampling rod 4 moves to the release position of the sample cup rack 7, the immersion sampling cup 6 and the cup body joint seat 5 enter the U-shaped long hole of the release baffle 702, the sampling rod 4 is lifted up, and the immersion sampling cup 6 and the cup body joint seat 6 fall off the sampling rod 4 due to the obstruction of the release baffle 702. The operator determines whether the molten iron package needs to continue wire feeding processing or be directly used for casting pouring based on the results of the creep effect analysis, and the molten iron sampling thermal analysis process is completed.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sampling device for a vermicular cast iron cover after feeding wire, characterized in that: It includes a base, a translation seat, a sampling rod, a lifting driver, a controller and a thermal analyzer, wherein the translation seat is movably connected to the base, a lifting driver is provided above the translation seat, the lifting driver is movably connected to the sampling rod, and the bottom of the sampling rod is connected to the immersion sampling cup through a cup body joint seat; The interior of the sampling rod is hollow to form a wire channel, and a wire adapter is provided at the bottom of the sampling rod, and a thermocouple adapter and a liquid level adapter are provided on the wire adapter; The cup body joint seat is provided with a seat body, a thermocouple probe, a liquid level electrode and a clamp, the clamp is clamped with the outer peripheral ring groove of the wire adapter seat, the seat body is distributed with a thermocouple probe and a liquid level electrode, and the thermocouple probe and the liquid level electrode correspond to the positions of the thermocouple adapter and the liquid level adapter on the wire adapter seat respectively; The immersion sampling cup includes a cup body, the upper edge of the cup body is provided with a buckle, and the buckle is engaged with the outer peripheral groove of the cup body joint seat; the end of the base is provided with a controller and a thermal analyzer; the base is arranged on the top of the vermicular graphite cast iron wire feeding workstation, the molten iron ladle is arranged below the vermicular graphite cast iron wire feeding workstation, and a sampling hole is provided on the wire feeding ladle cover.

2. A sampling device for a compacted graphite cast iron cap after wire feeding according to claim 1, characterized in that: A sample cup rack is provided at one end of the base, including a sample cup seat and a release baffle. The sample cup seat is a round hole-shaped cup seat, and its diameter matches the outer diameter of the immersion sampling cup. The release baffle is provided with a U-shaped long hole, and the width of the U-shaped long hole is smaller than the outer diameter of the clamp of the cup body joint seat.

3. The sampling device after the vermicular graphite cast iron cap is fed with wire according to claim 1, characterized in that: The base is provided with position sensors corresponding to the sampling position and the tripping position respectively.

4. The sampling device after the vermicular graphite cast iron cap is fed with wire according to claim 1, characterized in that: The sampling rod is provided with limit switches, which are respectively correspondingly arranged at the upper limit position and the lower limit position.

5. The sampling device after the vermicular graphite cast iron cap is fed with wire according to claim 1, characterized in that: The seat body and clamp of the cup body joint seat are integrally stamped from a low-carbon steel plate with a thickness of 0.8-1.5mm, and the cup body and buckle of the immersion sampling cup are integrally stamped from a low-carbon steel plate with a thickness of 0.8-1.5mm; after the cup body joint seat and the immersion sampling cup are clamped together, a refractory coating is applied on the outer surface.

6. The sampling device after the vermicular graphite cast iron cap is fed with wire according to claim 1, characterized in that: The thermocouple probe is a K-type fast thermocouple with an outer diameter of 4 to 5 mm; the model of the thermal analyzer is PD-GD.

7. The sampling device after the vermicular graphite cast iron cap is fed with wire according to claim 1, characterized in that: The translation seat is a linear motor module; the lifting drive is a rack lifting mechanism.

8. The sampling device after the vermicular graphite cast iron cap is fed with wire according to claim 1, characterized in that: The two ends of the base are respectively provided with a first safety travel switch and a second safety travel switch.

9. The sampling device after the vermicular graphite cast iron cap is fed with wire according to claim 1, characterized in that: The PLC in the controller is respectively connected to the translation motor driver, the lifting motor driver, the thermocouple, the thermal analyzer, the liquid level electrode switch, the upper limit switch of the sampling rod, the lower limit switch of the sampling rod, the safety travel switch 1 and the safety travel switch 2, the sampling position travel switch and the tripping position travel switch, the translation motor driver is connected to the translation servo motor, and the lifting motor driver is connected to the lifting servo motor; the thermal analyzer communicates with the PLC according to the MELSEC protocol.

10. A method for analyzing the creepage of a vermicular graphite cast iron cap after feeding wire, characterized in that: The specific steps are as follows: 1) Connect the sampling cup, place the immersion sampling cup in the sample cup seat of the sample cup rack, connect the bottom of the sampling rod to the cup body joint seat in advance, and control the sampling rod to rise to the upper limit position, then translate it to the sampling position above the sample cup rack, and move the sampling rod downward until the cup body joint seat and the sampling rod are installed; 2) The sampling position is in place, the sampling rod moves up 100-250mm, and then moves in the opposite direction to reach the top of the sampling hole; 3) Sampling: When the molten iron wire feeding is finished, the sampling rod is controlled to descend, and the immersion sampling cup passes through the sampling hole into the molten iron ladle. When the liquid level electrode contacts the molten iron, the stop descending signal is triggered, the sampling rod stops moving downward, and the molten iron is poured into the immersion sampling cup, completing the sampling; 4) Solidification at room temperature, the sampling rod rises until the immersion sampling cup reaches above the wire feeding workstation, stops rising, the molten iron sample cools down and solidifies, the thermocouple obtains the temperature of the molten iron sample and transmits it to the thermal analyzer, the thermal analyzer extracts the temperature curve of the molten iron sample during the solidification and cooling process and performs differential processing on it, performs thermal analysis by identifying the characteristic points of the temperature curve and the differential curve, and obtains the creeping effect of the molten iron; 5) After the sample cup is detached and the thermal analysis is completed, the sampling rod moves to the tripping position of the sample cup rack, the immersion sampling cup and the cup body joint seat enter the U-shaped long hole on the tripping baffle, the sampling rod is lifted up, and the immersion sampling cup and the cup body joint seat fall off the sampling rod due to the obstruction of the tripping baffle. The operator determines whether the molten iron package needs to continue wire feeding or be directly used for casting according to the results of the creep effect analysis, and the molten iron sampling thermal analysis process is completed.

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