Regeneration method of resin sand

Abstract

According to the resin sand regeneration method, a regeneration furnace is used for heating regeneration, a sand conveying cavity is formed in a roller part of the regeneration furnace, the sand conveying cavity extends in the transverse direction, one end of the sand conveying cavity is a sand inlet end, and the other end of the sand conveying cavity is a sand outlet end; the driving part is configured to drive the roller part to rotate; the electric heating part is arranged on the roller part; the sand adding part is arranged at the sand inlet end of the roller part; the sand discharging part is arranged at the sand inlet end of the roller part; the gas inlet part is configured to supply gas into the sand conveying cavity; the exhaust part is configured to exhaust gas in the sand conveying cavity; when the roller part rotates in the first direction, sand in the sand conveying cavity is conveyed in the direction from the sand inlet end to the sand outlet end and discharged out of the roller part. When the roller part rotates in the second direction, sand in the sand conveying cavity is conveyed from the sand outlet end to the sand inlet end and discharged out of the roller part from the sand discharging part. The regeneration furnace is horizontal, resin sand in the regeneration furnace can be emptied, use and maintenance are convenient, and an electric heating mode is adopted, so that atmosphere pollution is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of resin sand regeneration, and in particular to a resin sand regeneration method. Background Art

[0002] Sand mold 3D printing equipment uses resin sand to produce models. After pouring, the resin sand needs to be regenerated before the 3D printing equipment can be used normally. The purpose of regeneration is to remove the resin on the surface of the sand.

[0003] The conventional resin sand regeneration method is to use a thermal boiling furnace. A high-pressure fan sprays air from the bottom of the boiling furnace to blow up the resin sand. The blown resin sand comes into contact with the flame sprayed from the natural gas burner, and the resin on the surface of the resin sand is burned out. The exhaust gas after combustion is sucked away by the dust removal system.

[0004] The thermal boiling furnace has the following problems: the diameter of sand used for 3D printing is smaller than that of sand used for conventional casting, and the high-pressure fan can easily blow a large amount of sand into the dust removal system, causing the dust removal system to be blocked; excessive air enters the boiling furnace and generates a large amount of nitrogen oxides through combustion in the burner, polluting the atmosphere; after the furnace is shut down, there will be a large amount of sand at the bottom of the furnace, which cannot be discharged cleanly, affecting its use and maintenance.

[0005] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In view of the problems pointed out in the background technology, the present invention proposes a resin sand regeneration method, in which the regeneration furnace is horizontally placed, and the resin sand in the regeneration furnace can be emptied, which is convenient for use and maintenance, and electric heating is adopted to avoid air pollution.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: In some embodiments of the present application, a resin sand regeneration method is provided, which uses a regeneration furnace for heating and regeneration, and the regeneration furnace includes: a drum portion, a sand conveying cavity is formed inside, the sand conveying cavity extends in the transverse direction, the first end of the sand conveying cavity is a sand feeding end, and the second end of the sand conveying cavity is a sand discharging end; a driving portion is configured to drive the drum portion to rotate; an electric heating portion is arranged on the drum portion and is configured to heat the drum portion; a sand adding portion is arranged at the sand feeding end of the drum portion and is configured to supply resin sand into the sand feeding cavity; a sand discharging portion is arranged at the sand feeding end of the drum portion; an air inlet portion is communicated with the sand feeding cavity and is configured to supply gas into the sand feeding cavity; an exhaust portion is communicated with the sand feeding cavity and is configured to discharge the gas in the sand feeding cavity; The regeneration method includes: when the regeneration furnace performs electric heating to regenerate the resin sand, the drum part rotates in a first direction, and the sand in the sand conveying cavity is transported from the sand inlet end to the sand outlet end and discharged from the drum part; when the regeneration furnace is stopped, the drum part rotates in a second direction, the first direction is opposite to the second direction, and the sand in the sand conveying cavity is transported from the sand outlet end to the sand inlet end and discharged from the drum part from the sand outlet part.

[0008] In some embodiments of the present application, the regeneration furnace has a first working stage, the drum part rotates at a first speed, the drum part rotates in a first direction, the electric heating part heats the drum part, and after the temperature of the drum part rises to a first temperature range, the sand adding part adds sand into the sand conveying chamber, and the amount of sand added by the sand adding part changes from small to large.

[0009] In some embodiments of the present application, the regeneration furnace has a second working stage, the sand adding part stops adding sand, the drum part rotates at a second speed, the drum part rotates along a second direction, the power of the electric heating part is reduced, and when there is no residual sand in the sand conveying chamber, the drum part stops rotating, and the electric heating part stops heating.

[0010] In some embodiments of the present application, a first sensor is provided on the exhaust portion, and the first sensor is configured to detect the negative pressure at the sand feeding end of the drum portion; A second sensor is disposed on the drum portion, and the second sensor is configured to detect the temperature of the sand feeding end of the drum portion; The intake portion is configured to adjust an intake amount according to detection data of the first sensor and the second sensor, and the exhaust portion is configured to adjust an exhaust amount according to detection data of the first sensor and the second sensor so that the intake amount and the exhaust amount match.

[0011] In some embodiments of the present application, a third sensor is provided on the drum portion, and the third sensor is configured to detect the temperature of the sand outlet end of the drum portion; The regeneration furnace has a third working stage, the air intake portion increases the air intake volume, and the exhaust portion increases the exhaust volume according to the detection data of the third sensor to accelerate the temperature reduction of the drum portion.

[0012] In some embodiments of the present application, the regeneration furnace also includes a cover shell, and the drum portion is passed through the cover shell; the driving portion includes a first driving motor, and the power shaft of the first driving motor is connected to the first gear; a slewing bearing is arranged on the outer peripheral wall of the drum portion, and the outer ring gear of the slewing bearing is meshed with the first gear, and the inner ring of the slewing bearing is fixedly connected to the cover shell; an extension portion is arranged on the outer peripheral wall of the drum portion, and the extension portion is fixedly connected to the outer ring gear of the slewing bearing.

[0013] In some embodiments of the present application, two extension portions are arranged on the roller portion along the axial direction thereof, and one of the two extension portions is fixedly connected to the outer ring gear; a floating support portion is arranged on the cover shell, and the other of the two extension portions is in contact with the floating support portion.

[0014] In some embodiments of the present application, the cover shell includes a heat-insulating cover shell, and the electric heating part is arranged in the heat-insulating cover shell; a first cover shell is arranged at the first end of the heat-insulating cover shell, and the first gear, the slewing bearing, and one of the two extension parts are located in the inner cavity of the first cover shell, and the first drive motor is arranged outside the first cover shell; a second cover shell is arranged at the second end of the heat-insulating cover shell, and the floating support part and the other of the two extension parts are located in the inner cavity of the second cover shell.

[0015] In some embodiments of the present application, the sand adding part includes a second driving motor and a sand adding cylinder, a spiral blade is arranged in the sand adding cylinder, the spiral blade is connected to the power shaft of the second driving motor, a sand adding port is arranged on the sand adding cylinder, and the sand adding cylinder extends into the drum part.

[0016] In some embodiments of the present application, a plurality of guide plates arranged at intervals are provided on the inner wall of the drum portion, the plurality of guide plates are provided at the sand feeding end of the drum portion, and the guide plates extend spirally along the axial direction of the drum portion; A plurality of material lifting plates arranged at intervals are arranged on the inner wall of the drum portion, the plurality of material lifting plates are arranged between the sand inlet end and the sand outlet end, the electric heating portion corresponds to the plurality of material lifting plates, and the material lifting plates extend along the axial direction of the drum portion.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are: The regeneration furnace uses the electric heating part to heat the drum part, and then heats the sand material in the drum part, and then heats and burns the resin on the surface of the sand material. During the working process, the drum part rotates continuously to improve the uniformity of heating the sand material and improve the resin burning effect. The electric heating method avoids the problem of air pollution caused by the burner combustion in the prior art.

[0018] After the work is finished, there will still be a certain amount of sand in the sand conveying chamber. The driving unit drives the roller unit to rotate in the reverse direction, and the sand is transported from the sand outlet end of the sand conveying chamber to the sand inlet end, and discharged from the roller unit from the sand inlet end. The regeneration furnace in the prior art is vertical, and it is impossible to empty the remaining sand. In this case, the roller unit is set to a horizontal type, and the conveying direction of the sand is changed by the forward and reverse rotation of the roller unit. After the work is finished, the sand can be transported and emptied in the reverse direction, and the remaining sand in the roller unit can be discharged, which is convenient for subsequent use and maintenance.

[0019] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A structural diagram of a resin sand thermal regeneration furnace according to some embodiments; Figure 2 A cross-sectional view of a resin sand thermal regeneration furnace according to some embodiments; Figure 3 A structural diagram of a drum unit and an electric heating unit according to some embodiments; Figure 4 is a structural diagram of a drum portion according to some embodiments; Figure 5 is a cross-sectional view of a drum portion according to some embodiments; Figure 6 A structural diagram of a roller part, a driving part and a floating support part according to some embodiments; Figure 7 is a structural diagram of a drum unit and a driving unit according to some embodiments; Figure 8 is a structural diagram of a floating support portion according to some embodiments; Fig. 9 4 is a structural diagram of a sand adding unit according to some embodiments.

[0022] Reference numerals: 100, roller part; 110, sand conveying cavity; 111, sand inlet end; 112, sand outlet end; 120, material guide plate; 130, material lifting plate; 140, first extension part; 150, second extension part; 161, circumferential rib ring; 162, radial rib ring; 200, driving unit; 210, first driving motor; 220, first gear; 230, slewing bearing; 231, inner ring; 232, outer ring gear; 300, electric heating unit; 310, electric heating element; 400, sand adding part; 410, second driving motor; 420, sand adding cylinder; 430, sand adding port; 440, spiral blade; 510, sand discharge housing; 511, fifth side wall; 512, sixth side wall; 513, third circumferential wall; 514, sand discharge port; 520, sand outlet housing; 521, seventh side wall; 522, eighth side wall; 523, fourth circumferential wall; 524, sand outlet; 530, first housing; 531, first side wall; 532, second side wall; 533, first circumferential wall; 534, first installation cavity; 540, second housing; 541, third side wall; 542, fourth side wall; 543, second circumferential wall; 544, second mounting cavity; 550, thermal insulation cover; 600, air intake portion; 610, air intake pipe; 700, exhaust unit; 710, exhaust pipe; 800, floating support part; 810, first roller; 820, second roller; 830, mounting frame; 910, first sensor; 920, second sensor; 930, third sensor. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0029] In some embodiments of the present application, a resin sand thermal regeneration furnace is provided, referring to Figure 1 and Figure 2 The regeneration furnace uses electric heating to remove the resin on the surface of the resin sand.

[0030] The regeneration furnace includes a drum unit 100. The structure of the drum unit 100 is as follows: Figure 4 and Figure 5As shown. A sand delivery cavity 110 is formed inside the drum part 100, and the left and right ends of the sand delivery cavity 110 are connected. The first end of the sand delivery cavity 110 is a sand inlet end 111, and the second end of the sand delivery cavity 110 is a sand outlet end 112, and the first end is opposite to the second end. The drum part 100 is horizontal, that is, the sand delivery cavity 110 extends in the lateral direction, for example, the sand delivery cavity 110 extends in the horizontal direction.

[0031] The regeneration furnace further includes a driving unit 200 , and the driving unit 200 is configured to drive the drum unit 100 to rotate. Figure 6 and Figure 7 The figure shows a structure diagram of the driving part 200 and the drum part 100. The driving part 200 adopts frequency conversion control, and controls the residence time of the resin sand in the drum part 100 by adjusting the rotation speed.

[0032] The regeneration furnace further includes an electric heating unit 300 . The electric heating unit 300 is disposed on the drum unit 100 and is configured to heat the drum unit 100 . Figure 3 It is a structural diagram of the drum part 100 and the electric heating part 300.

[0033] The regeneration furnace further includes a sand supplying unit 400 . The sand supplying unit 400 is disposed at the sand inlet end 111 of the drum unit 100 and is configured to supply resin sand into the sand supplying cavity 110 . Fig. 9 It is a structural diagram of the sand adding part 400.

[0034] The regeneration method of the regeneration furnace includes: when the regeneration furnace performs electrical heating to regenerate resin sand, the drum part 100 rotates along a first direction, and the sand in the sand conveying cavity 110 is conveyed from the sand inlet end 111 to the sand outlet end 112 and discharged from the drum part 100.

[0035] In other words, during operation, sand is added to the sand inlet end 111 of the drum portion 100 through the sand adding portion 400, the driving portion 200 drives the drum portion 100 to rotate in a first direction (for example, counterclockwise), the electric heating portion 300 heats the drum portion 100, the temperature of the drum portion 100 increases, the sand in the sand conveying cavity 110 is heated, and the resin on the surface of the sand is fully burned. As the drum portion 100 rotates, the sand in the sand conveying cavity 110 is transported from the sand inlet end 111 to the sand outlet end 112, the sand is heated and burned while being transported in the sand conveying cavity 110, until the sand is transported to the sand outlet end 112 and discharged from the drum portion 100 from the sand outlet end 112.

[0036] The regeneration furnace of this case uses the electric heating part 300 to heat the roller part 100, thereby heating the sand material in the roller part 100, and then heating and burning the resin on the surface of the sand material to remove it. During the working process, the roller part 100 rotates continuously to improve the uniformity of heating the sand material and improve the resin removal effect. The electric heating method avoids the problem of air pollution caused by burning by a burner in the prior art.

[0037] The regeneration method of the regeneration furnace also includes: when the regeneration furnace is stopped, the drum part 100 rotates along the second direction, the first direction is opposite to the second direction, and the sand in the sand conveying cavity 110 is transported from the sand outlet end 112 to the sand inlet end 111, and discharged from the drum part 100 from the sand discharge part.

[0038] In other words, after the work is completed, there will still be a certain amount of sand in the sand conveying chamber, and the driving unit 200 drives the drum unit 100 to rotate in the second direction (for example, clockwise), and the sand is transported from the sand outlet end 112 of the sand conveying chamber 110 to the sand inlet end 111, and discharged from the drum unit 100 from the sand inlet end 111.

[0039] The regeneration furnace in the prior art is vertically placed, and the residual sand cannot be emptied. In this case, the drum part 100 is set to be horizontal, and the conveying direction of the sand material is changed by the forward and reverse rotation of the drum part 100. After the work is completed, the sand material can be conveyed and emptied in the reverse direction, and the residual sand in the drum part 100 can be discharged, which is convenient for subsequent use and maintenance.

[0040] In some embodiments of the present application, the sand adding unit 400 adopts a shaftless screw and is servo controlled. Figure 2 and Fig. 9 The sand adding part 400 includes a second driving motor 410 and a sand adding cylinder 420. The sand adding cylinder 420 is arranged horizontally. One end of the sand adding cylinder 420 is fixedly connected to the housing of the second driving motor 410, and the other opposite end of the sand adding cylinder 420 is open and extends into the drum part 100, and is located at the sand feeding end 111.

[0041] A spiral blade 440 is disposed in the sand adding cylinder 420, and the spiral blade 440 is fixedly connected to the power shaft of the second driving motor 410. A sand adding port 430 is disposed on the sand adding cylinder 420. The sand adding port 430 is disposed at the top of the sand adding cylinder 420.

[0042] When adding sand, the second driving motor 410 is started to drive the spiral blade 440 to rotate, and the sand is added into the sand adding cylinder 420 through the sand adding port 430 . Driven by the spiral blade 440 , the sand is transported into the drum portion 100 .

[0043] The second driving motor 410 adopts frequency conversion control, and controls the amount of resin sand added by adjusting the rotation speed.

[0044] In some embodiments of the present application, refer to Figure 3 The electric heating part 300 is an electric heating element 310, and the electric heating element 310 is arranged on the outer peripheral wall of the drum part 100. For example, the electric heating element 310 can be an electromagnetic heating plate, a resistance wire structure, or a silicon carbon rod structure. The electric heating element 310 is closely attached to the outer peripheral wall surface of the drum part 100 to improve the heating effect.

[0045] The heating wire adopts a U-shaped structure, which is convenient for disassembly and maintenance, and at the same time increases the contact area with the roller part 100 to improve the heating effect.

[0046] In some embodiments of the present application, refer to Figure 2 The regeneration furnace further includes a heat-insulating cover 550, which is disposed around the drum portion 100 and covers the electric heating element 310, thereby improving the heat-insulating effect and reducing heat loss.

[0047] In some embodiments of the present application, refer to Figure 2 The regeneration furnace further includes a first housing 530, through which the drum portion 100 passes. The first housing 530 includes a first side wall 531, a second side wall 532, and a first circumferential wall 533. The first side wall 531 and the second side wall 532 are spaced apart along the axial direction of the drum portion 100, and the first circumferential wall 533 is connected between the first side wall 531 and the second side wall 532. A first installation cavity 534 is formed in the first housing 530. The first side wall 531 and the second side wall 532 are provided with openings for the drum portion 100 to pass through.

[0048] In some embodiments of the present application, refer to Figure 2 , Figure 6 as well as Figure 7 The driving unit 200 includes a first driving motor 210 , and a power shaft of the first driving motor 210 is connected to a first gear 220 .

[0049] A slewing bearing 230 is disposed on the outer peripheral wall of the drum portion 100 . The outer ring 232 of the slewing bearing 230 is geared with the first gear 220 . The inner ring 231 of the slewing bearing 230 is fixedly connected to the first housing 530 , specifically, to the first side wall 531 .

[0050] A first extension portion 140 is disposed on the outer peripheral wall of the drum portion 100 , and the first extension portion 140 extends along the circumferential direction of the drum portion 100 . The first extension portion 140 is fixedly connected to the outer ring gear 232 of the slewing bearing 230 .

[0051] The first gear 220, the slewing bearing 230, and the first extension 140 are located in the inner cavity of the first housing 530, that is, in the first installation cavity 534. The first housing 530 protects these components. The first drive motor 210 is disposed outside the first housing 530 and fixedly disposed on the first side wall 531.

[0052] The first driving motor 210 is started to drive the first gear 220 to rotate, and the first gear 220 drives the outer ring gear 232 of the slewing bearing 230 to rotate, and the outer ring gear 232 of the slewing bearing 230 drives the drum part 100 to rotate synchronously.

[0053] In some embodiments of the present application, refer to Figure 2 , Figure 6 as well as Figure 8 The regeneration furnace further includes a second housing 540, through which the drum portion 100 passes. The second housing 540 includes a third side wall 541, a fourth side wall 542, and a second circumferential wall 543. The third side wall 541 and the fourth side wall 542 are spaced apart in the axial direction of the drum portion 100, and the second circumferential wall 543 is connected between the third side wall 541 and the fourth side wall 542. A second installation cavity 544 is formed in the second housing 540. The third side wall 541 and the fourth side wall 542 are provided with openings through which the drum portion 100 passes.

[0054] The outer peripheral wall of the drum portion 100 is provided with a second extension portion 150, and the second extension portion 150 extends along the circumferential direction of the drum portion 100. The second housing 540 is provided with a floating support portion 800, and the second extension portion 150 contacts the floating support portion 800. The floating support portion 800 is provided on the inner side of the fourth side wall 542. The floating support portion 800 and the second extension portion 150 are located in the inner cavity of the second housing 540, that is, in the second installation cavity 544.

[0055] The first cover shell 530 and the second cover shell 540 are arranged at intervals along the axial direction of the drum part 100. The first cover shell 530 is close to the sand inlet end 111 of the drum part 100, and the second cover shell 540 is close to the sand outlet end 112 of the drum part 100.

[0056] One end of the roller part 100 is a driving end, and the other opposite end is a driven end. The floating support part 800 provides floating support to the roller part 100 , thereby improving the rotation reliability of the roller part 100 .

[0057] In some embodiments of the present application, refer to Figure 8 The floating support parts 800 include two floating support parts 800, which are arranged at the lower position of the drum part 100 to provide floating support from the left and right sides of the drum part 100.

[0058] In some embodiments of the present application, the floating support portion 800 includes a mounting frame 830 , which is fixedly disposed on the inner side of the fourth side wall 542 . A roller is disposed on the mounting frame 830 , and the roller is in rolling contact with the drum portion 100 .

[0059] The mounting frame 830 is provided with a first roller 810 and a second roller 820 . The first roller 810 and the second roller 820 are arranged at intervals along the circumference of the drum portion 100 , so as to improve the support reliability of the drum portion 100 .

[0060] In some embodiments of the present application, the heat-insulating cover 550 is disposed between the first cover 530 and the second cover 540 , one end of the heat-insulating cover 550 is fixedly connected to the second side wall 532 , and the other end is fixedly connected to the third side wall 541 , and the structure is compact.

[0061] The first cover shell 530 also serves as a temperature insulation, thereby reducing the heat generated by the electric heating unit 300 from being transferred to the first installation cavity 534 and causing the high temperature of the driving unit 200.

[0062] In some embodiments of the present application, the first extension portion 140 is a hollow structure to reduce heat transfer from the drum portion 100 to the driving portion 200 and the first cover shell 530 .

[0063] The second extension portion 150 is a hollow structure, which reduces the heat transfer from the drum portion 100 to the floating support portion 800 and the second cover shell 540 .

[0064] In some embodiments of the present application, refer to Figure 4 The first extension part 140 and the second extension part 150 respectively include a circumferential rib ring 161 and a radial rib ring 162. The circumferential rib ring 161 is arranged around the drum part 100. A plurality of radial rib rings 162 are arranged between the circumferential rib ring 161 and the outer peripheral wall of the drum part 100. A hollow structure is formed between two adjacent radial rib rings 162.

[0065] The circumferential rib ring 161 of the first extension part 140 is fixedly disposed with the outer ring gear 232 of the slewing bearing 230 . The circumferential rib ring 161 of the second extension part 150 is in contact with the roller of the floating support part 800 .

[0066] In some embodiments of the present application, refer to Figure 1 and Figure 2 The regeneration furnace further includes a sand discharge cover 510, which is disposed at the sand inlet end 111 of the drum portion 100. The sand discharge cover 510 is provided with a sand discharge port 514, which is disposed downward.

[0067] The sand discharge housing 510 includes a fifth side wall 511, a sixth side wall 512 and a third circumferential wall 513. The third circumferential wall 513 is connected between the fifth side wall 511 and the sixth side wall 512. The bottom of the third circumferential wall 513 is open to form a sand discharge port 514.

[0068] The fifth side wall 511 is provided with a through opening for the sand adding cylinder 420 to pass through, and the sixth side wall 512 is provided with a through opening for the drum portion 100 to pass through. The sand adding cylinder 420 extends into the drum portion 100 through the fifth side wall 511 .

[0069] When the drum portion 100 rotates in the second direction, the sand in the drum portion 100 is transported from the sand outlet end 112 to the sand inlet end 111 , and the sand falls into the sand discharge housing 510 from the sand inlet end 111 and is discharged from the sand discharge port 514 .

[0070] In some embodiments of the present application, refer to Figure 1 and Figure 2 The regeneration furnace further includes a sand discharge cover 520 , which is disposed at the sand discharge end 112 of the drum portion 100 , and a sand discharge port 524 is disposed on the sand discharge cover 520 .

[0071] The sand outlet housing 520 includes a seventh side wall 521, an eighth side wall 522 and a fourth circumferential wall 523. The fourth circumferential wall 523 is connected between the seventh side wall 521 and the eighth side wall 522. The bottom of the fourth circumferential wall 523 is open to form a sand outlet 524, and the sand outlet 524 faces downward.

[0072] When the drum portion 100 rotates in the first direction, the sand in the drum portion 100 is transported from the sand inlet end 111 to the sand outlet end 112 , and the sand falls into the sand outlet housing 520 from the sand outlet end 112 and is discharged from the sand outlet port 524 .

[0073] In some embodiments of the present application, refer to Figure 5 A plurality of guide plates 120 are arranged at intervals on the inner wall of the drum part 100. The plurality of guide plates 120 are arranged at the sand feeding end 111 of the drum part 100. The guide plates 120 spirally extend along the axial direction of the drum part 100. The guide plates 120 transport the sand material at the sand feeding end 111 to the middle of the sand conveying cavity 110.

[0074] In some embodiments of the present application, refer to Figure 5 A plurality of material lifting plates 130 are arranged at intervals on the inner wall of the drum part 100, and the plurality of material lifting plates 130 are arranged between the sand inlet end 111 and the sand outlet end 112. The electric heating part 300 corresponds to the plurality of material lifting plates 130, and the material lifting plates 130 extend along the axial direction of the drum part 100, that is, the material lifting plates 130 are straight plate-shaped.

[0075] The material raising plate 130 raises the sand material to heat it evenly and ensure that the resin on the surface of the sand material is completely burned. In the process of being raised and falling, the sand material collides and rubs against each other, which helps to knock off the resin ash attached to the surface of the sand material.

[0076] In some embodiments of the present application, refer to Figure 1 and Figure 2 The regeneration furnace further includes an air inlet 600 . The air inlet 600 is communicated with the sand conveying cavity 110 and is configured to supply gas into the sand conveying cavity 110 .

[0077] The regeneration furnace further includes an exhaust portion 700 . The exhaust portion 700 is communicated with the sand conveying cavity 110 and is configured to exhaust the gas in the sand conveying cavity 110 .

[0078] By providing the air inlet 600 and the air exhaust 700, air circulation is formed in the drum 100, so that the polluted air after the resin on the surface of the sand material is heated and burned can be discharged in time.

[0079] In some embodiments of the present application, the air inlet 600 is disposed at the sand outlet end 112 of the drum 100, and the air outlet 700 is disposed at the sand inlet end 111 of the drum 100. In this way, the air flow direction in the drum 100 is opposite to the conveying direction of the sand material, and the air flow can more effectively blow away the resin ash attached to the surface of the sand material.

[0080] In some embodiments of the present application, the air intake portion 600 includes an air intake pipe 610 and an external air source (not shown). The air intake pipe 610 is fixedly disposed on the second housing 540. For example, the air intake pipe 610 is fixedly disposed on the eighth side wall 522, and the air intake pipe 610 extends along the axial direction of the drum portion 100.

[0081] The exhaust part 700 includes an exhaust pipe 710 and an external dust removal system (not shown). The exhaust pipe 710 is fixedly disposed on the first housing 530. For example, the exhaust pipe 710 is fixedly disposed on the top of the third circumferential wall 513.

[0082] In some embodiments of the present application, a first sensor 910 is disposed on the exhaust portion 700 , and the first sensor 910 is configured to detect the negative pressure at the sand feeding end 111 of the drum portion 100 .

[0083] The drum portion 100 is provided with a second sensor 920 , and the second sensor 920 is configured to detect the temperature of the sand feeding end 111 of the drum portion 100 .

[0084] The air intake section 600 is configured to adjust the air intake volume according to the detection data of the first sensor 910 and the second sensor 920, and the exhaust section 700 is configured to adjust the exhaust volume according to the detection data of the first sensor 910 and the second sensor 920, so as to match the air intake volume and the exhaust volume, thereby fully burning the resin on the surface of the sand material, reducing the excessive extraction of hot air by the dust removal system, and achieving energy saving and emission reduction.

[0085] In some embodiments of the present application, a third sensor 930 is disposed on the drum portion 100 , and the third sensor 930 is configured to detect the temperature of the sand outlet end 112 of the drum portion 100 .

[0086] In some embodiments of the present application, the regeneration furnace further includes a flame injection unit (not shown), which is configured to inject flames into the inner cavity of the drum part 100. Specifically, the flame injection unit injects flames into the sand inlet end 111 of the drum part 100. The flame injection unit uses natural gas fuel or other fuels. In this way, the regeneration furnace is a double-fired regeneration furnace. The drum part 100 provides an overall high-temperature environment through the external electric heating element 310, and high-temperature conduction and heat radiation are formed inside to heat the drum part 100 to a high temperature. The flame heating is provided inside by the flame injection unit. At the same time as the auxiliary heat is added, the resin organic matter that has not been fully burned inside can be burned by flame to fully decompose, so as to meet the requirements of emission indicators.

[0087] In some embodiments of the present application, the regeneration furnace has a first working stage, the drum part 100 rotates at a first speed, the drum part 100 rotates in a first direction, the electric heating part 300 heats the drum part 100, and after the temperature of the drum part 100 rises to the first temperature range, the sand adding part 400 adds sand into the sand conveying cavity 110, and the amount of sand added by the sand adding part 400 changes from small to large.

[0088] Specifically, the first working stage is the combustion stage of the regeneration furnace. The drum part 100 rotates slowly first, and the electric heating part 300 heats the drum part 100. The drum part 100 heats up quickly. The temperature measured by the third sensor 930 is used to control the heating power of the electric heating element 310 using PID technology. When the temperature of the drum part 100 rises to the set temperature value, for example 700°C, the power of the electric heating element 310 is reduced to maintain the temperature of the drum part 100 stable.

[0089] After the temperature of the drum part 100 reaches the first temperature range required by the process, the second driving motor 410 is started, and the sand adding part 400 begins to add sand into the drum part 100, and the amount of sand added gradually increases to a set value. The rotation speed of the drum part 100 can be adjusted according to the amount of sand added by the sand adding part 400 and the temperature of the sand outlet end 112 of the drum part 100 to ensure that the amount of resin sand added matches the processing capacity of the drum part 100.

[0090] During the combustion process of the regeneration furnace, the air intake volume of the air intake and pipe is adjusted to match the exhaust volume of the exhaust part 700 according to the data of the first sensor 910 and the second sensor 920, so as to fully burn the resin on the surface of the resin sand and reduce the excessive extraction of hot air by the exhaust dust removal system, thereby achieving energy saving and emission reduction.

[0091] In some embodiments of the present application, the regeneration furnace has a second working stage, the sand adding part 400 stops adding sand, the drum part 100 rotates at a second speed, the drum part 100 rotates along the second direction, the power of the electric heating part 300 is reduced, and when there is no residual sand in the sand conveying cavity 110, the drum part 100 stops rotating, and the electric heating part 300 stops heating.

[0092] In other words, the second working stage is the shutdown stage of the regeneration furnace. When the regeneration furnace is ready to shut down, the second drive motor 410 stops first, the sand adding part 400 stops adding sand, the drum part 100 rotates slowly for a period of time, and the drum part 100 rotates along the second direction to ensure that the residual tailings in the drum part 100 can be completely processed and discharged from the sand discharge port 514. At the same time, the power of the electromagnetic heating plate 310 is slowly reduced until the temperature sensor detects the target temperature. When the resin sand in the drum part 100 is completely emptied, the regeneration furnace stops working.

[0093] In some embodiments of the present application, the regeneration furnace has a third working stage, the air intake part 600 increases the air intake volume, and the exhaust part 700 increases the exhaust volume according to the detection data of the third sensor 930 to accelerate the cooling of the drum part 100.

[0094] In other words, the third working stage is the shutdown and maintenance stage of the regeneration furnace. The air inlet pipe 610 increases the amount of cold air added, and the exhaust part 700 increases the exhaust volume according to the temperature of the sand outlet end 112 of the drum part 100 measured by the third sensor 930, so that the drum part 100 can be cooled down quickly, reducing the downtime increased by waiting for the equipment to cool down.

[0095] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0096] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for regenerating resin sand, characterized in that: A regeneration furnace is used for heating regeneration, and the regeneration furnace includes: The drum portion has a sand conveying cavity formed therein, the sand conveying cavity extends in a transverse direction, the first end of the sand conveying cavity is a sand inlet end, and the second end of the sand conveying cavity is a sand outlet end; a driving unit configured to drive the roller unit to rotate; an electric heating portion, disposed on the drum portion and configured to heat the drum portion; A sand supplying part, disposed at a sand feeding end of the drum part, and configured to supply resin sand into the sand conveying cavity; A sand discharge part, arranged at the sand inlet end of the drum part; an air inlet portion, communicated with the sand transport cavity and configured to supply gas into the sand transport cavity; an exhaust portion, communicated with the sand conveying cavity and configured to exhaust the gas in the sand conveying cavity; The regeneration method comprises: When the regeneration furnace performs electrical heating to regenerate the resin sand, the drum portion rotates in a first direction, and the sand in the sand conveying cavity is conveyed from the sand inlet end to the sand outlet end and discharged from the drum portion; When the regeneration furnace is shut down, the drum portion rotates in a second direction, the first direction being opposite to the second direction, and the sand in the sand conveying cavity is transported from the sand outlet end to the sand inlet end and discharged from the drum portion from the sand discharge portion.

2. The resin sand regeneration method according to claim 1, characterized in that: The regeneration furnace has a first working stage, the drum part rotates at a first speed, the drum part rotates in a first direction, the electric heating part heats the drum part, and after the temperature of the drum part rises to a first temperature range, the sand adding part adds sand into the sand conveying cavity, and the amount of sand added by the sand adding part changes from small to large.

3. The resin sand regeneration method according to claim 1, characterized in that: The regeneration furnace has a second working stage, the sand adding part stops adding sand, the drum part rotates at a second speed, the drum part rotates in a second direction, the power of the electric heating part is reduced, and when there is no residual sand in the sand conveying cavity, the drum part stops rotating and the electric heating part stops heating.

4. The resin sand regeneration method according to claim 1, characterized in that: The exhaust portion is provided with a first sensor, and the first sensor is configured to detect the negative pressure at the sand feeding end of the drum portion; A second sensor is disposed on the drum portion, and the second sensor is configured to detect the temperature of the sand feeding end of the drum portion; The intake portion is configured to adjust an intake amount according to detection data of the first sensor and the second sensor, and the exhaust portion is configured to adjust an exhaust amount according to detection data of the first sensor and the second sensor so that the intake amount and the exhaust amount match.

5. The resin sand regeneration method according to claim 1, characterized in that: A third sensor is disposed on the drum portion, and the third sensor is configured to detect the temperature of the sand outlet end of the drum portion; The regeneration furnace has a third working stage, the air intake portion increases the air intake volume, and the exhaust portion increases the exhaust volume according to the detection data of the third sensor to accelerate the temperature reduction of the drum portion.

6. The resin sand regeneration method according to any one of claims 1 to 5, characterized in that: The regeneration furnace further comprises a cover shell, and the drum portion passes through the cover shell; The driving unit includes a first driving motor, and a power shaft of the first driving motor is connected to a first gear; A slewing bearing is provided on the outer peripheral wall of the drum portion, the outer ring gear of the slewing bearing is meshed with the first gear, and the inner ring of the slewing bearing is fixedly connected to the housing; An extension portion is provided on the outer peripheral wall of the drum portion, and the extension portion is fixedly connected to the outer ring gear of the slewing bearing.

7. The resin sand regeneration method according to claim 6, characterized in that: Two extension parts are arranged on the roller part along the axial direction thereof at intervals, and one of the two extension parts is fixedly connected to the outer ring gear; The cover shell is provided with a floating support portion, and the other of the two extension portions is in contact with the floating support portion.

8. The resin sand regeneration method according to claim 7, characterized in that: The cover shell includes a heat-insulating cover shell, and the electric heating part is arranged in the heat-insulating cover shell; The first end of the heat-insulating housing is provided with a first housing, the first gear, the slewing bearing, and one of the two extensions are located in the inner cavity of the first housing, and the first driving motor is arranged outside the first housing; A second cover shell is disposed at the second end of the heat-insulating cover shell, and the floating support portion and the other of the two extension portions are located in the inner cavity of the second cover shell.

9. The resin sand regeneration method according to any one of claims 1 to 5, characterized in that: The sand adding part includes a second driving motor and a sand adding cylinder. The sand adding cylinder is provided with a spiral blade, and the spiral blade is connected to the power shaft of the second driving motor. The sand adding cylinder is provided with a sand adding port, and the sand adding cylinder extends into the drum part.

10. The resin sand regeneration method according to any one of claims 1 to 5, characterized in that: A plurality of guide plates arranged at intervals are provided on the inner wall of the drum portion, the plurality of guide plates are provided at the sand feeding end of the drum portion, and the guide plates extend spirally along the axial direction of the drum portion; A plurality of material lifting plates arranged at intervals are arranged on the inner wall of the drum portion, the plurality of material lifting plates are arranged between the sand inlet end and the sand outlet end, the electric heating portion corresponds to the plurality of material lifting plates, and the material lifting plates extend along the axial direction of the drum portion.

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