Resistance band heated roller hearth furnace

Abstract

A kind of resistance band heated roller bottom type heat treatment furnace, it relates to heat treatment field.The resistance band heated roller bottom type heat treatment furnace includes heat treatment furnace body and conveying roller way, bottom wall in heat treatment furnace body is fixed with multiple bottom resistance bands, top wall in heat treatment furnace body is connected with multiple top resistance bands by multiple hanging devices;Each hanging device includes heat-resistant rod, two ceramic rings being set on the top of heat-resistant rod, ceramic tube being set on the middle of heat-resistant rod and two ceramic pieces being set on ceramic tube, two ceramic pieces respectively press the top and bottom of two adjacent top resistance bands, top wall of heat treatment furnace body is connected with multiple heat-resistant steel plates by multiple heat-resistant connecting pieces, heat-resistant rod of hanging device all passes through and is connected to a heat-resistant steel plate, two ceramic rings of hanging device respectively press the top wall and bottom wall of heat-resistant steel plate.The resistance band heated roller bottom type heat treatment furnace is heated by being arranged resistance band in the top and bottom of heat treatment furnace body, so that temperature in heat treatment furnace body is more uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat treatment, in particular to a roller hearth heat treatment furnace heated by resistance strips. BACKGROUND

[0002] The heat treatment furnace can be generally divided into gas burner heating and electric heating according to the heating mode. The heating mode of the electric heating heat treatment furnace is generally divided into resistance strip and electric radiation tube. The heat treatment furnace heated by the gas burner has a more complex combustion system configuration and control mode, and has a larger investment cost in the early stage, but has a lower heating cost. The energy saving of the heat treatment furnace heated by the gas burner is 45% compared with the electric heating heat treatment furnace. The temperature control of the electric heating heat treatment furnace is more accurate, so the products with relatively strict heat treatment quality requirements generally select the electric heating heat treatment furnace. The resistance strip is a commonly used heating material of the electric heating furnace, which has the advantages of convenient use and convenient temperature control. However, the existing resistance strip heating furnace generally arranges the resistance strip on the furnace bottom or the furnace side wall of the heating furnace, so that the temperature of the top of the heating furnace is lower than that of the bottom and the two sides, and the temperature distribution in the heating furnace is uneven. SUMMARY

[0003] The purpose of the present application is to provide a roller hearth heat treatment furnace heated by resistance strips, which heats by arranging the resistance strips on the top and bottom of the heat treatment furnace body, so that the temperature in the heat treatment furnace body is more uniform.

[0004] The present application is realized in this way:

[0005] The present application provides a roller hearth heat treatment furnace heated by resistance strips, which comprises a heat treatment furnace body and a conveying roller for driving a heat treatment piece to pass through the heat treatment furnace body. A plurality of bottom resistance strips are fixed to the inner bottom wall of the heat treatment furnace body, and a plurality of top resistance strips are connected to the inner top wall of the heat treatment furnace body through a plurality of hanging devices. Each hanging device comprises a heat-resistant rod, two ceramic rings fixed to the top of the heat-resistant rod at an interval, a ceramic tube fixed to the middle of the heat-resistant rod, and two ceramic pieces fixed to the ceramic tube at an interval. The two ceramic pieces are used to press the top and bottom of two adjacent top resistance strips, respectively. The top wall of the heat treatment furnace body is connected to a plurality of heat-resistant steel plates through a plurality of heat-resistant connecting pieces. The heat-resistant rod of each hanging device penetrates and is connected to one heat-resistant steel plate. The two ceramic rings of each hanging device press the top wall and the bottom wall of the heat-resistant steel plate, respectively.

[0006] In some optional embodiments, the two ceramic pieces of each hanging device are respectively protruded to form a pair of oppositely arranged insulation bosses at the adjacent sides of the two ceramic pieces. The two pairs of insulation bosses are respectively attached to the top outer side wall and the bottom outer side wall of the two top resistance strips located on both sides of the ceramic tube.

[0007] In some alternative embodiments, the top of the heat-resistant rod is provided with two first fixing nuts, which respectively press against the top and bottom of the two ceramic rings.

[0008] In some alternative embodiments, the top of the heat treatment furnace body is provided with a furnace top opening and a plurality of furnace top covers arranged on the top of the heat treatment furnace body to close the furnace top opening. The furnace top cover comprises a furnace cover body, a furnace top refractory fiber module connected to the bottom of the furnace cover body through a plurality of connecting pieces, and two furnace cover side plates respectively connected to the bottom of the two ends of the furnace cover body. The bottom of the two ends of the furnace cover body, the two ends of the furnace top refractory fiber module, and the two furnace cover side plates respectively enclose a gap for accommodating the top ends of the two side walls of the heat treatment furnace body. The two ends of the furnace top refractory fiber module are respectively recessed to form first recesses, and one side of the bottom of the furnace top refractory fiber module is protruded to form a first protrusion, and the other side of the bottom of the furnace top refractory fiber module is recessed to form a second recess matched with the first protrusion. The top of the heat-resistant connecting piece is connected to the furnace cover body through the furnace top refractory fiber module.

[0009] In some alternative embodiments, the top of the furnace cover body is connected with a plurality of lifting lugs.

[0010] In some alternative embodiments, a plurality of first refractory fiber blankets are further included, and two first refractory fiber blankets are arranged in sequence to cover the bottom walls of the two ends of the furnace cover body, the top of the end faces of the two ends of the furnace top refractory fiber module, the inner walls of the two first recesses, and the bottom surfaces of the two ends of the furnace top refractory fiber module.

[0011] In some alternative embodiments, the two sides of the furnace top refractory fiber module are respectively provided with second refractory fiber blankets.

[0012] In some alternative embodiments, the discharge end of the heat treatment furnace body is provided with an acceleration roller for receiving the heat treatment pieces conveyed by the conveying roller, a lifting device for receiving and driving the heat treatment pieces conveyed by the acceleration roller to ascend and descend, and a quenching tank. The quenching tank is Π-shaped and consists of an online quenching tank, an overflow tank, and offline quenching tanks connected to one end of the online quenching tank and the overflow tank, respectively. The bottom wall of the online quenching tank is arranged obliquely, and the depth of the bottom wall gradually increases as it approaches the offline quenching tank. The bottom wall of the end of the online quenching tank far from the offline quenching tank is connected with a plurality of water inlet pipes, which are in communication with a water supply pipe. The overflow tank is connected with at least one extraction pipe, and the extraction pipe is connected with a water outlet pump. The online quenching tank is located below the lifting device.

[0013] In some alternative embodiments, the bottom wall of the end of the online quenching tank close to the offline quenching tank is recessed to form a sedimentation tank.

[0014] In some alternative embodiments, the side wall of the online quenching tank is hinged with a closing plate that can be turned to open and close the sedimentation tank and a driving device for driving the closing plate to turn.

[0015] The beneficial effects of the present application are: the roller bottom type heat treatment furnace provided by the present application comprises a heat treatment furnace body and a conveying roller for driving the heat treatment piece to pass through the heat treatment furnace body, a plurality of bottom resistance bands are fixed on the inner bottom wall of the heat treatment furnace body, and a plurality of top resistance bands are connected to the inner top wall of the heat treatment furnace body through a plurality of hanging devices; each hanging device comprises a heat-resistant rod, two ceramic rings fixed on the top of the heat-resistant rod in an upper and lower interval, a ceramic tube fixed on the middle of the heat-resistant rod, and two ceramic pieces fixed on the ceramic tube in an upper and lower interval, the two ceramic pieces are used for pressing the top and bottom of two adjacent top resistance bands respectively, the top wall of the heat treatment furnace body is connected with a plurality of heat-resistant steel plates through a plurality of heat-resistant connecting pieces, the heat-resistant rod of each hanging device penetrates and is connected to one heat-resistant steel plate, and the two ceramic rings of each hanging device press the top wall and the bottom wall of the heat-resistant steel plate respectively. The roller bottom type heat treatment furnace provided by the present application is heated by arranging resistance bands on the top and bottom of the heat treatment furnace body, so that the temperature in the heat treatment furnace body is more uniform. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0017] Figure 1 The structural schematic diagram of the roller bottom type heat treatment furnace provided by an embodiment of the present application is shown in the figure.

[0018] Figure 2 The structural schematic diagram of the roller bottom type heat treatment furnace provided by an embodiment of the present application is shown in the figure.

[0019] Figure 3 The structural schematic diagram of the roller bottom type heat treatment furnace provided by an embodiment of the present application is shown in the figure. Figure 1 The sectional view along the A-A sectional line in the figure.

[0020] Figure 4 The sectional view along the B-B sectional line in the figure. Figure 1 The sectional view along the B-B sectional line in the figure.

[0021] Figure 5 The partial sectional structural schematic diagram of the roller bottom type heat treatment furnace provided by an embodiment of the present application is shown in the figure, in which the furnace cover body is arranged on the heat treatment furnace body and the hanging device and the top resistance band are omitted.

[0022] Figure 6 The structural schematic diagram of the roller bottom type heat treatment furnace provided by an embodiment of the present application is shown in the figure, in which two furnace cover bodies are arranged in sequence.

[0023] Figure 7 Figure 1 is a schematic view of a roller hearth furnace according to an embodiment of the present application; Figure 6 Figure 2 is a sectional view along the section line A-A in Figure 1 ;

[0024] Figure 8 Figure 3 is a schematic view of a partial structure of a hanging device in a roller hearth furnace with resistance strip heating according to an embodiment of the present application;

[0025] Figure 9 Figure 4 is a schematic view of a ceramic piece in a roller hearth furnace with resistance strip heating according to an embodiment of the present application;

[0026] Figure 10 Figure 5 is a schematic view of a quenching tank in a roller hearth furnace with resistance strip heating according to an embodiment of the present application;

[0027] Figure 11 Figure 6 is a sectional view along the section line B-B in Figure 1 ; Figure 10 Figure 7 is a sectional view along the section line C-C in Figure 1 ;

[0028] Figure 12 Figure 8 is a sectional view along the section line D-D in Figure 1 ; Figure 10 Figure 9 is a sectional view along the section line E-E in Figure 1 ;

[0029] Figure 13 Figure 10 is a schematic view of a partial sectional structure of an in-line quenching tank in a roller hearth furnace with resistance strip heating according to another embodiment of the present application.

[0030] In the drawings: 100, furnace body; 101, furnace wall; 102, furnace wall refractory fiber module; 103, second protrusion; 104, furnace cover bolt; 110, conveying roller; 120, bottom resistance strip; 130, top resistance strip; 140, heat-resistant connecting piece; 150, heat-resistant steel plate; 160, furnace top opening; 170, terminal; 200, heat-resistant rod; 210, ceramic ring; 220, ceramic tube; 230, ceramic piece; 240, insulating boss; 250, first fixing nut; 260, second fixing nut; 270, fixing pin; 300, furnace cover body; 310, connecting piece; 320, furnace top refractory fiber module; 330, furnace cover side plate; 331, gap; 340, first groove; 350, first protrusion; 360, second groove; 370, lifting lug; 380, first refractory fiber blanket; 390, second refractory fiber blanket; 400, accelerating roller; 410, lifting device; 500, quenching tank; 510, in-line quenching tank; 520, overflow tank; 530, off-line quenching tank; 531, first overflow weir; 532, second overflow weir; 540, sedimentation tank; 550, water inlet pipe; 560, water supply pipe; 570, extraction pipe; 580, water outlet pump; 590, closing plate; 591, rotating shaft; 592, motor; 600, water return pool. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0033] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical", "overhang" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0036] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless specifically stated and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0038] The features and performances of the resistance band heated roller hearth heat treatment furnace of the present application are further described in detail below in combination with the embodiments.

[0039] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 , the present application provides a resistance band heated roller hearth heat treatment furnace, which comprises a heat treatment furnace body 100 and a conveying roller 110 for driving the heat treatment pieces to pass through the heat treatment furnace body 100, the top of the heat treatment furnace body 100 is provided with a furnace top opening 160 and furnace top covers arranged in sequence on the top of the heat treatment furnace body 100, each furnace top cover is used to cooperate to close the furnace top opening 160, the discharge end of the heat treatment furnace body 100 is provided with an acceleration roller 400 for receiving the heat treatment pieces conveyed by the conveying roller 110, a lifting device 410 for receiving and driving the heat treatment pieces lifted by the acceleration roller 400 and a quenching tank 500;

[0040] The bottom resistance band 120 is fixedly connected on the refractory brick layer of the inner bottom wall of the heat treatment furnace body 100 by fixing nails, and the top resistance band 130 is connected on the inner top wall of the heat treatment furnace body 100 and arranged in parallel along the width direction. The two sides of each top resistance band 130 are connected to the top wall of the heat treatment furnace body 100 by the hanging device arranged along the length direction. Each hanging device comprises a heat-resistant rod 200, two ceramic rings 210 fixedly sleeved on the top of the heat-resistant rod 200, a ceramic tube 220 fixedly sleeved on the middle of the heat-resistant rod 200, and two ceramic pieces 230 fixedly sleeved on the ceramic tube 220. The two ceramic pieces 230 are used to press the top and bottom of two adjacent top resistance bands 130 respectively. The top of the heat-resistant rod 200 is fixedly sleeved with two first fixed nuts 250, and the two first fixed nuts 250 press the top and bottom of the two ceramic rings 210 respectively. The top wall of the heat treatment furnace body 100 is connected with heat-resistant steel plates 150 arranged along the length direction. Each heat-resistant steel plate 150 is connected to the top wall of the heat treatment furnace body 100 by the heat-resistant connecting piece 140 arranged at intervals. The heat-resistant rod 200 of each hanging device penetrates and is connected to one heat-resistant steel plate 150. The two ceramic rings 210 of each hanging device press the top wall and the bottom wall of the heat-resistant steel plate 150 respectively. The two ceramic pieces 230 of each hanging device are arranged in pairs on the two sides of one end, and form a pair of insulating bosses 240 arranged in pairs. The two pairs of insulating bosses 240 are respectively attached to the top outer side wall and the bottom outer side wall of the two top resistance bands 130 on the two sides of the ceramic tube 220. The bottom of the heat-resistant rod 200 is threadedly sleeved with a second fixed nut 260 pressing the bottom of the ceramic tube 220, and the bottom of the heat-resistant rod 200 is connected with a fixed pin 270.

[0041] Each furnace roof cover comprises a furnace cover body 300, a furnace roof refractory fiber module 320 connected to the bottom of the furnace cover body 300 through the spacer connecting piece 310, two furnace cover side plates 330 respectively connected to the bottom of the two ends of the furnace cover body 300, two first refractory fiber blankets 380 and two second refractory fiber blankets 390, the bottom of the two ends of the furnace cover body 300, the two ends of the furnace roof refractory fiber module 320 and the two furnace cover side plates 330 respectively enclose the gap 331 accommodating the top end of the furnace wall 101 on both sides of the heat treatment furnace body 100, the two ends of the furnace roof refractory fiber module 320 are respectively recessed to form the first recess 340, the side of the bottom of the furnace roof refractory fiber module 320 is protruded to form the first protrusion 350, and the other side of the bottom of the furnace roof refractory fiber module 320 is recessed to form the second recess 360 matched with the first protrusion 350; the top of the heat-resistant connecting piece 140 is connected to the furnace cover body 300 through the furnace roof refractory fiber module 320, the top of the furnace cover body 300 is connected with four lifting lugs 370, the two first refractory fiber blankets 380 are respectively sequentially covered on the bottom wall of the two ends of the furnace cover body 300, the top of the end face of the two ends of the furnace roof refractory fiber module 320, the inner wall of the two first recesses 340 and the bottom surface of the two ends of the furnace roof refractory fiber module 320, and the two second refractory fiber blankets 390 are respectively arranged on the two sides of the furnace roof refractory fiber module 320; the two ends of the furnace cover body 300 are respectively connected to the top of the furnace wall 101 on both sides of the heat treatment furnace body 100 through the furnace cover bolts 104. The furnace cover body 300 is connected with the terminal 170 penetrating into the heat treatment furnace body 100 and connected with the top resistance band 130.

[0042] The quenching tank 500 is Π-shaped and comprises an online quenching tank 510 arranged below the lifting device 410, an overflow tank 520 and offline quenching tanks 530 connected to one end of the online quenching tank 510 and the overflow tank 520 respectively. The bottom wall of the online quenching tank 510 is arranged obliquely and the depth of the bottom wall gradually increases as it approaches the offline quenching tank 530. The bottom wall of the end of the online quenching tank 510 close to the offline quenching tank 530 is recessed to form a sediment tank 540. The bottom wall of the end of the online quenching tank 510 away from the offline quenching tank 530 is connected with six water inlet pipes 550, which are respectively communicated with the water supply pipe 560. The overflow tank 520 is connected with two extraction pipes 570, each of which is connected with a water outlet pump 580. The water outlet pump 580 and the water supply pipe 560 are respectively communicated with the water return tank 600. The online quenching tank 510 and the offline quenching tank 530 are isolated by a first overflow weir 531, and the offline quenching tank 530 and the overflow tank 520 are isolated by a second overflow weir 532. The height of the first overflow weir 531 is higher than that of the second overflow weir 532, and the depth of the overflow tank 520 is greater than that of the online quenching tank 510 and the offline quenching tank 530.

[0043] The resistance band heated roller bottom type heat treatment furnace provided by the embodiment of the present application is characterized in that the bottom wall and the top wall in the heat treatment furnace body 100 are respectively connected with the bottom resistance band 120 and the top resistance band 130 arranged along the width direction at intervals, which can effectively improve the uniformity of the temperature in the heat treatment furnace body 100 and improve the processing quality of the heat treated parts. The top resistance band 130 is fixed to the top of the heat treatment furnace body 100 by using a hanging device, and a heat-resistant rod 200 made of heat-resistant steel is used as a framework for supporting the top resistance band 130. The top of the heat-resistant rod 200 penetrates through and is connected to a heat-resistant steel plate 150, and a heat-resistant connecting piece 140 is used to hang the heat-resistant steel plate 150 and the heat-resistant rod 200 on the top of the heat treatment furnace body 100. Meanwhile, a pair of ceramic rings 210 are sleeved on the top of the heat-resistant rod 200 and are respectively located on the top and the bottom of the heat-resistant steel plate 150 to isolate and fix the heat-resistant steel plate 150. Two first fixing nuts 250 are used to press and fix the two ceramic rings 210 and the heat-resistant steel plate 150 by being threadedly sleeved on the heat-resistant rod 200. The ceramic tube 220 is sleeved on the middle part of the heat-resistant rod 200, which can reduce the contact between the heat-resistant rod 200 and the furnace gas in a high-temperature state, reduce the oxidation of the heat-resistant rod 200, and thus prolong the service life. The second fixing nut 260 is threadedly sleeved on the bottom of the heat-resistant rod 200 to limit the position of the ceramic tube 220. Meanwhile, the fixing pin 270 is connected to the bottom of the heat-resistant rod 200 to limit and support the position of the second fixing nut 260.

[0044] The two ceramic pieces 230 are sleeved on the ceramic tube 220 and are arranged at intervals. The two ceramic pieces 230 press and fix the top and the bottom of the two top resistance bands 130 penetrating through the two sides of the ceramic tube 220. The two ceramic pieces 230 in each hanging device on the two sides of the top resistance band 130 press and fix different positions of the top and the bottom of the top resistance band 130, respectively, so as to ensure that the top resistance band 130 is stably hung on the top of the heating furnace. The two ceramic pieces 230 of each hanging device are respectively formed with a pair of oppositely arranged insulation bosses 240 on the two sides of the adjacent end. The two pairs of insulation bosses 240 are respectively attached to the top outer side wall and the bottom outer side wall of the two top resistance bands 130 on the two sides of the ceramic tube 220. The two insulation bosses 240 on the two sides of the adjacent end of the two ceramic pieces 230 can further wrap and isolate the outer side walls of the two top resistance bands 130 on the two sides of the ceramic tube 220, so as to effectively avoid the short circuit caused by the deformation or softening of the adjacent top resistance bands 130 after being heated by electricity. The safety hidden danger caused by the arrangement of the top resistance band 130 in the top of the heat treatment furnace body 100 is solved, the arrangement space of the top resistance band 130 is increased, the electric heating power is greatly increased in the same internal space of the heat treatment furnace body 100, and the processing capacity of the heat treatment furnace body 100 is improved.

[0045] The resistance band heated roller bottom type heat treatment furnace provided by the embodiment separates the furnace body and the furnace top of the heat treatment furnace body 100 to be independently designed, and the furnace top opening 160 is arranged at the top of the heat treatment furnace body 100. The number of furnace top covers arranged in sequence at the top of the heat treatment furnace body 100 is determined according to the length of the heat treatment furnace body 100, and each furnace top cover is used to cooperate to close the furnace top opening 160. The furnace top cover comprises a furnace cover body 300, a furnace top refractory fiber module 320 connected to the bottom of the furnace cover body 300 through the connecting pieces 310 arranged at intervals, and two furnace cover side plates 330 respectively connected to the bottom of the two ends of the furnace cover body 300. In use, the furnace cover body 300 is hung on the top of the heat treatment furnace body 100 by using the lifting lugs 370 arranged on the top surface, and the two end bottoms of the furnace cover body 300, the two ends of the furnace top refractory fiber module 320 and the two gaps 331 respectively formed between the two furnace cover side plates 330 accommodate the top ends of the two side walls 101 of the heat treatment furnace body 100, effectively improving the heat sealing property of the connection between the furnace cover body 300 and the two side walls 101 of the heat treatment furnace body 100, and the two end bottoms of the furnace top refractory fiber module 320 are respectively recessed to form first recesses 340. At this time, the second protrusions 103 arranged on the top of the furnace wall refractory fiber module 102 arranged on the inner wall of the two side walls 101 of the heat treatment furnace body 100 are respectively accommodated in the two first recesses 340 to form a stepped compression seal, further improving the heat sealing property between the furnace top cover and the two side walls 101 of the heat treatment furnace body 100. At the same time, each furnace top cover is arranged in sequence along the length direction of the heat treatment furnace body 100, so that the first protrusions 350 formed by the side protrusions of the two furnace top refractory fiber modules 320 connected to the bottom end of the two adjacent furnace cover bodies 300 and the second recesses 360 formed by the recesses cooperate to form a stepped compression seal, and the second refractory fiber blanket 390 is arranged between the two furnace top refractory fiber modules 320 of the two adjacent furnace cover bodies 300. The heat sealing property of the furnace top formed by the connection of each furnace top cover can be improved. In addition, by arranging the first refractory fiber blanket 380 between the two end bottoms of the furnace top cover and the two side walls 101 of the heat treatment furnace body 100, the two first refractory fiber blankets 380 respectively cover the two end bottom walls of the furnace cover body 300, the top of the two end faces of the furnace top refractory fiber module 320, the inner wall of the two first recesses 340 and the two end bottom surfaces of the furnace top refractory fiber module 320 in sequence, so as to ensure the heat sealing property of the furnace body and the furnace top of the heat treatment furnace body 100, improve the heat preservation performance of the whole heat treatment furnace body 100, make the temperature control in the heat treatment furnace body 100 easier, and make the furnace temperature of the heat treatment furnace body 100 relatively uniform.

[0046] The resistance-heated roller hearth heat treatment furnace provided in this embodiment of the application has an acceleration roller 400 for receiving heat-treated parts conveyed by the conveyor roller 110, a lifting device 410 for receiving and driving the acceleration roller 400 to lift and lower the heat-treated parts, and a quenching tank 500 at the discharge end of the heat treatment furnace body 100. The quenching tank 500 consists of an online quenching tank 510 located below the lifting device 410, an overflow tank 520, and an offline quenching tank 530 connected at both ends to one end of the online quenching tank 510 and the overflow tank 520, respectively. This ensures that the acceleration roller 400 receives the heat-treated parts conveyed by the conveyor roller 110 and conveys them to the lifting device 410, which descends into the online quenching tank 510, for quenching. After quenching, the lifting device 410 supports the heat-treated parts to rise completely. For heat treatment and quenching operations, the offline quenching tank 530 is located on the side of the accelerating roller conveyor 400 and is used for offline quenching of thick plates. At the same time, in order to ensure that the temperature of the water medium in the online quenching tank 510 and the offline quenching tank 530 is maintained at a suitable quenching temperature, an overflow tank 520 is provided at one end of the offline quenching tank 530. Water is introduced into the bottom of the online quenching tank 510 through the water supply pipe 560 and the water in the inlet pipe 550. The water at the top of the online quenching tank 510 contacts the quenching plate to quench and heat up. After the water in the online quenching tank 510 is heated, it overflows into the offline quenching tank 530 through the first overflow weir 531. The water in the offline quenching tank 530 overflows into the overflow tank 520 through the second overflow weir 532. The water in the overflow tank 520 is then extracted through the extraction pipe 570 by the outlet pump 580.

[0047] By arranging the bottom wall of the online quenching tank 510 at an angle and gradually increasing the depth of the bottom wall as it approaches the offline quenching tank 530, the water flow from the inlet pipe 550 into the online quenching tank 510 flushes the oxide deposits into the sedimentation tank 540 along the inclined bottom wall of the online quenching tank 510 for collection and storage, making it convenient for operators to clean the oxide deposits in the sedimentation tank 540 regularly.

[0048] like Figure 13 As shown, in other optional embodiments, a rotatable shaft 591 is connected to the side wall of the online quenching tank 510. The shaft 591 is connected to a rotatable opening and closing sealing plate 590 of the sedimentation tank 540. The shaft 591 is also connected to a motor 592 for driving its rotation. By providing a rotatable opening or closing sealing plate 590 for the sedimentation tank 540 and a motor 592 for driving the shaft 591 connected to the sealing plate 590 to rotate, operators can easily control the motor 592 to drive the sealing plate 590 to rotate and open or close the sedimentation tank 540, so as to collect oxide deposits on the bottom wall of the online quenching tank 510 using the sedimentation tank 540.

[0049] The embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

Claims

1. A resistance band heated roller hearth heat treatment furnace comprising a heat treatment furnace body and a conveying roller way for driving a heat treatment piece to pass through the heat treatment furnace body, a plurality of bottom resistance bands are fixed on the inner bottom wall of the heat treatment furnace body, characterized in that, The top wall of the heat treatment furnace body is connected with a plurality of top resistance bands through a plurality of hanging devices; each of the hanging devices comprises a heat-resistant rod, two ceramic rings fixedly sleeved on the top of the heat-resistant rod in an upper-lower interval, a ceramic tube fixedly sleeved on the middle of the heat-resistant rod, and two ceramic pieces fixedly sleeved on the ceramic tube in an upper-lower interval, the two ceramic pieces being used for respectively pressing the top and bottom of two adjacent top resistance bands, the top wall of the heat treatment furnace body is connected with a plurality of heat-resistant steel plates through a plurality of heat-resistant connecting pieces, the heat-resistant rod of each of the hanging devices penetrates through and is connected to one of the heat-resistant steel plates, and the two ceramic rings of each of the hanging devices press against the top wall and the bottom wall of the heat-resistant steel plate, respectively.

2. The electrically resistive band-heated roller hearth furnace of claim 1, wherein, The top wall of the heat treatment furnace body is connected with a plurality of top resistance bands through a plurality of hanging devices; each of the hanging devices comprises a heat-resistant rod, two ceramic rings fixedly sleeved on the top of the heat-resistant rod in an upper-lower interval, a ceramic tube fixedly sleeved on the middle of the heat-resistant rod, and two ceramic pieces fixedly sleeved on the ceramic tube in an upper-lower interval, the two ceramic pieces being used for respectively pressing the top and bottom of two adjacent top resistance bands, the top wall of the heat treatment furnace body is connected with a plurality of heat-resistant steel plates through a plurality of heat-resistant connecting pieces, the heat-resistant rod of each of the hanging devices penetrates through and is connected to one of the heat-resistant steel plates, and the two ceramic rings of each of the hanging devices press against the top wall and the bottom wall of the heat-resistant steel plate, respectively.

3. The electrically resistive band-heated roller hearth furnace of claim 1, wherein, The top of the heat-resistant rod is fixedly sleeved with two first fixing nuts, and the two first fixing nuts press against the top and bottom of the two ceramic rings, respectively.

4. The electrically resistive band-heated roller hearth furnace of claim 1, wherein, The top of the furnace cover body is connected with a plurality of lifting lugs.

5. The electrically resistive strip-heated roller hearth furnace of claim 1 wherein, Further comprising a plurality of first fire-resistant fiber blankets, two of the first fire-resistant fiber blankets sequentially covering the bottom walls of the two ends of the furnace cover body, the top surfaces of the two ends of the furnace top fire-resistant fiber module, the inner walls of the two first grooves, and the bottom surfaces of the two ends of the furnace top fire-resistant fiber module, respectively.

6. The electrically resistive strip-heated roller hearth furnace of claim 1 wherein, The two sides of the furnace top fire-resistant fiber module are respectively provided with second fire-resistant fiber blankets. The top of the furnace cover body is connected with a plurality of lifting lugs.

7. The electrically resistive strip-heated roller hearth furnace of claim 1 wherein, The discharge end of the heat treatment furnace body is provided with an accelerating roller way for receiving the heat treatment piece conveyed by the conveying roller way, a lifting device for receiving and driving the accelerating roller way to lift the heat treatment piece, and a quenching tank; the quenching tank is Π-shaped and consists of an online quenching tank, an overflow tank, and offline quenching tanks connected with the online quenching tank and one end of the overflow tank respectively; the bottom wall of the online quenching tank is arranged obliquely and the depth of the bottom wall gradually increases as it approaches the offline quenching tank; a plurality of water inlet pipes are connected with the bottom wall of the end of the online quenching tank away from the offline quenching tank, and the water inlet pipes are in communication with a water supply pipe; at least one extraction pipe is connected with the overflow tank, and the extraction pipe is connected with a water outlet pump; the online quenching tank is located below the lifting device.

8. The electrically resistive band-heated roller hearth furnace of claim 7, wherein, The bottom wall of the end of the online quenching tank close to the offline quenching tank is recessed to form a sedimentation tank.

9. The electrically resistive strip-heated roller hearth furnace of claim 8 wherein, A closing plate for turning on and off the sedimentation tank and a driving device for driving the closing plate to turn are hinged to the side wall of the online quenching tank.

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