Rotary hearth furnace

Abstract

The utility model relates to a rotary hearth furnace which comprises a furnace bottom frame and a furnace bottom driving device, a pin gear ring is arranged on the furnace bottom frame, the furnace bottom driving device comprises a pin gear, a hydraulic motor speed reducer and a reciprocating driving mechanism, the reciprocating driving mechanism comprises a guide rail seat, a guide rail and a reciprocating power unit, and the hydraulic motor speed reducer is installed on the guide rail. The pin gear is installed at the output end of the hydraulic motor speed reducer, the guide rail is slidably arranged on the guide rail base, and one end of the guide rail is connected with the output end of the reciprocating power unit so that the pin gear can have a transmission position meshed with the pin gear ring and a standby position away from the pin gear ring. According to the utility model, the hydraulic motor speed reducer is adopted to drive the pin gear to rotate, so that not only can large output torque be provided, but also the hydraulic structure improves the stability, safety and reliability of mechanical operation of the furnace bottom; the reciprocating driving mechanism drives the hydraulic motor speed reducer and the pin gear to reciprocate, so that the pin gear and the pin gear ring can be reliably meshed or separated, and the rotating reliability of the furnace bottom frame is improved.

Description

Technical Field

[0001] The utility model relates to a rotary hearth furnace. Background Art

[0002] The rotary hearth furnace process is primarily used for the environmentally friendly treatment of zinc- and iron-containing dust and sludge in steel plants, effectively addressing the resource utilization of solid waste in steel plants. As a key component of the rotary hearth furnace system, the rotary hearth furnace bottom mechanism plays a vital role in the safe and reliable operation of the furnace during production.

[0003] The rotary hearth furnace's hearth mechanism primarily consists of an upper and lower hearth frame, a pinion gear ring, centering rollers, support rollers, and a drive mechanism. Currently, the rotary hearth furnace's hearth mechanism is mostly driven by a motor reducer. This drive mechanism is only suitable for small rotary hearth furnaces. For rotary hearth furnaces with a capacity of 300,000 tons or more, the motor reducer structure suffers from insufficient output capacity. Furthermore, as the rotary hearth furnace operates, the existing drive mechanism is prone to insufficient meshing reliability between the pinion gear and the pinion gear ring. Utility Model Content

[0004] The utility model relates to a rotary hearth furnace, which can at least solve some defects of the prior art.

[0005] The utility model relates to a rotary hearth furnace, comprising a furnace bottom frame and a furnace bottom drive device, wherein the furnace bottom frame is provided with a pin gear ring, the furnace bottom drive device comprises a pin gear, a hydraulic motor reducer and a reciprocating drive mechanism, the reciprocating drive mechanism comprises a guide rail seat, a guide rail and a reciprocating power unit, the hydraulic motor reducer is mounted on the guide rail, the pin gear is mounted on the output end of the hydraulic motor reducer, the guide rail is slidably arranged on the guide rail seat and one end is connected to the output end of the reciprocating power unit so that the pin gear has a transmission position engaged with the pin gear ring and a standby position away from the pin gear ring.

[0006] As one of the embodiments, a C-shaped guide groove is provided on the guide rail seat, and fixed slides are provided on the groove walls on both sides of the C-shaped guide groove. Movable slides are provided on the guide rail in a matching number, and each movable slide is slidably arranged on each fixed slide in a one-to-one correspondence.

[0007] As one of the implementation modes, in the C-shaped guide groove, a plate surface of one of the fixed slide plates is parallel to the horizontal plane, and the other fixed slide plate is arranged to be inclined relative to the horizontal plane.

[0008] As one of the implementation modes, the guide rail seat includes two guide rail blocks arranged opposite to each other on both sides of the guide rail, and the two guide rail blocks are both provided with the C-shaped guide groove and the notches of the two C-shaped guide grooves are opposite to each other.

[0009] As one of the implementation modes, there are two guide rail seats, and along the movable direction of the guide rail, the two guide rail seats are respectively arranged on both sides of the hydraulic motor reducer.

[0010] As one of the implementation modes, the rotary hearth furnace further includes a detection unit for detecting whether the pin gear is engaged with the pin gear ring.

[0011] As one embodiment, the detection unit includes a first sensing element provided on the guide rail and a second sensing element installed near the guide rail through a sensing bracket, wherein one of the first sensing element and the second sensing element is a sensing plate and the other sensing element is a sensing switch.

[0012] As one of the implementation modes, the rotary hearth furnace further includes an encoder, which is mounted on the guide rail via an encoder bracket and connected to the output end of the hydraulic motor reducer.

[0013] As one of the implementation modes, the reciprocating power unit includes a hydraulic cylinder.

[0014] As one of the implementation modes, there are multiple groups of furnace bottom driving devices, and the multiple groups of furnace bottom driving devices are sequentially spaced along the circumference of the furnace bottom frame.

[0015] The present invention has at least the following beneficial effects: in the present invention, a hydraulic motor reducer is used to drive the pin gear to rotate, which not only provides a large output torque, but also the hydraulic structure improves the stability and safety reliability of the operation of the furnace bottom machinery; the reciprocating drive mechanism drives the hydraulic motor reducer and the pin gear to reciprocate, which can achieve reliable engagement or separation between the pin gear and the pin gear ring, thereby improving the reliability of the rotation of the furnace bottom frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a furnace bottom driving device provided in an embodiment of the present utility model;

[0018] Figure 2 It is a schematic diagram of the cooperation between the guide rail and the guide rail seat;

[0019] Figure 3 A schematic structural diagram of the lower steel structure beam provided in an embodiment of the present utility model;

[0020] Figure 4 for Figure 3A magnified schematic diagram of part A;

[0021] Figure 5 This is a cross-sectional structural diagram of the furnace bottom frame provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1 and Figure 2 , an embodiment of the utility model provides a rotary hearth furnace, including a furnace bottom frame 100 and a furnace bottom driving device 200, the furnace bottom frame 100 is provided with a pin gear ring 1015, the furnace bottom driving device 200 includes a pin gear 204, a hydraulic motor reducer 203 and a reciprocating driving mechanism, the reciprocating driving mechanism includes a guide rail seat 202, a guide rail 201 and a reciprocating power unit 205, the hydraulic motor reducer 203 is installed on the guide rail 201, the pin gear 204 is installed at the output end of the hydraulic motor reducer 203, the guide rail 201 is slidably provided on the guide rail seat 202 and one end is connected to the output end of the reciprocating power unit 205 so that the pin gear 204 has a transmission position engaged with the pin gear ring 1015 and a standby position away from the pin gear ring 1015.

[0025] In this embodiment, a hydraulic motor reducer 203 is used to drive the pin gear 204 to rotate, which not only provides a large output torque, but also the hydraulic structure improves the stability and safety reliability of the furnace bottom mechanical operation; the reciprocating drive mechanism drives the hydraulic motor reducer 203 and the pin gear 204 to reciprocate, and the pin gear 204 can be reliably engaged or separated with the pin gear ring 1015, thereby improving the reliability of the rotation of the furnace bottom frame 100.

[0026] It can be understood that the hydraulic motor reducer 203 includes a hydraulic motor and a reducer structure. The reducer structure is driven by the hydraulic motor to operate, and the output end of the reducer structure constitutes the output end of the hydraulic motor reducer 203.

[0027] Preferably, if Figure 1 and Figure 2The output end of the hydraulic motor reducer 203 is also provided with a guide wheel 206, and the furnace bottom frame 100 is provided with a guide ring wall. When the pin gear 204 is in the transmission position, the guide wheel 206 rolls on the guide ring wall, which can further improve the meshing reliability of the pin gear 204 and the pin gear ring 1015.

[0028] In one embodiment, Figure 1 The rotary hearth furnace further includes an encoder 207, which is mounted on the guide rail 201 via an encoder bracket and connected to the output end of the hydraulic motor reducer 203. By detecting the output of the hydraulic motor reducer 203 via the encoder 207, the number of furnace bottom revolutions can be accurately detected.

[0029] In one embodiment, the furnace bottom drive device 200 comprises multiple groups, which are sequentially spaced apart along the circumference of the furnace bottom frame to ensure sufficient output capacity and reliably drive the furnace bottom frame 100 to rotate stably. Optionally, the furnace bottom drive device 200 is provided in four groups.

[0030] In one embodiment, the reciprocating power unit 205 includes a hydraulic cylinder.

[0031] In one embodiment, Figure 1 There are two guide rail seats 202. Along the moving direction of the guide rail 201, the two guide rail seats 202 are arranged on both sides of the hydraulic motor reducer 203. The two guide rail seats 202 are used to guide and constrain the guide rail 201, which can improve the movement stability and smoothness of the hydraulic motor reducer 203 and the pin gear 204, and ensure that the pin gear 204 is reliably engaged or separated with the pin gear ring 1015.

[0032] In one embodiment, Figure 2 The guide rail seat 202 is provided with a C-shaped guide groove 2022. Fixed slides 2023 are provided on both side walls of the C-shaped guide groove 2022. A matching number of movable slides 2031 are provided on the guide rail 201, with each movable slide 2031 slidingly mounted on each fixed slide 2023. A matching C-shaped guide portion is provided on the guide rail 201. The movable slides 2031 are mounted on the outer wall of the C-shaped guide portion. The C-shaped guide portion extends into the C-shaped guide groove 2022, allowing the movable slides 2031 to slideably engage with the corresponding fixed slides 2023. The coordination between the C-shaped guide portion and the C-shaped guide groove 2022, particularly the sliding coordination between the movable slides 2031 and the fixed slides 2023, effectively improves the stability and displacement accuracy of the reciprocating motion of the guide rail 201, thereby ensuring the meshing accuracy and reliability between the pin gear 204 and the pin gear ring 1015.

[0033] Furthermore, if Figure 2 In the C-shaped guide groove 2022, the surface of one of the fixed slides 2023 is parallel to the horizontal plane, and the other fixed slide 2023 is inclined relative to the horizontal plane. This can not only ensure the reliable guidance of the guide rail 201, but also better transfer the load exerted on the guide rail 201 to the guide rail seat 202, thereby improving the operating reliability and service life of the furnace bottom machinery.

[0034] More preferably, Figure 2 The guide rail seat 202 includes two guide rail blocks 2021 arranged on both sides of the guide rail 201. The two guide rail blocks 2021 are each provided with the C-shaped guide groove 2022 and the notches of the two C-shaped guide grooves 2022 are opposite to each other. This can further improve the guiding reliability of the guide rail 201 and improve the stability and displacement accuracy of the reciprocating activity of the guide rail 201.

[0035] In one embodiment, the rotary hearth furnace further comprises a detection unit 208 for detecting whether the pin gear 204 is engaged with the pin gear ring 1015. Figure 1 and Figure 2 The detection unit 208 includes a first sensing element disposed on the guide rail 201 and a second sensing element mounted near the guide rail 201 via a sensing bracket. One of the first and second sensing elements is a sensing plate 2082, and the other is a sensing switch 2081. The sensing switch 2081 includes, but is not limited to, a proximity switch, and the sensing plate 2082 can be a metal plate. Optionally, there can be two sensing switches 2081, one of which matches the transmission position of the pin gear 204 to detect whether the pin gear 204 is in the transmission position, and the other matches the standby position of the pin gear 204 to detect whether the pin gear 204 is in the standby position. This improves detection accuracy and allows for precise positioning of the pin gear 204 between the transmission position and the standby position.

[0036] like Figure 1 , also includes a base 209, the above-mentioned guide rail seat 202, reciprocating power unit 205, etc. can be installed on the base 209, and the base 209 can be installed on the workshop foundation.

[0037] Example 2

[0038] The embodiment of the present invention provides a furnace bottom frame 100 , which can be applied to the above-mentioned embodiment 1.

[0039] like Figure 3-Figure 5 The furnace bottom frame 100 includes a lower steel structure beam 101 and an upper steel structure beam 102 . Both the lower steel structure beam 101 and the upper steel structure beam 102 are annular structure beams. The upper steel structure beam 102 is non-fixedly arranged on the lower steel structure beam 101 .

[0040] The upper steel structure beam 102 is not fixedly connected to the lower steel structure beam 101, so the upper steel structure beam 102 can expand and deform freely due to heat, and will not cause irreversible deformation of the upper steel structure beam 102 due to the constraint of the lower steel structure beam 101; for example, the upper steel structure beam 102 can be directly placed on the lower steel structure beam 101.

[0041] Furthermore, if Figure 5 The furnace bottom frame 100 further includes at least one set of inner ring limiting assemblies and at least one set of outer ring limiting assemblies. The inner ring limiting assemblies include a first inner ring limiting portion 1012 and a second inner ring limiting portion 1021 that cooperate with each other in limiting positions. The first inner ring limiting portion 1012 is provided on the inner ring side of the lower steel structure beam 101, and the second inner ring limiting portion 1021 is provided on the inner ring side of the upper steel structure beam 102. The outer ring limiting assemblies include a first outer ring limiting portion 1013 and a second outer ring limiting portion 1022 that cooperate with each other in limiting positions. The first outer ring limiting portion 1013 is provided on the outer ring side of the lower steel structure beam 101, and the second outer ring limiting portion 1022 is provided on the outer ring side of the upper steel structure beam 102. The constraints of the inner ring limiting assemblies and the outer ring limiting assemblies ensure the stability and safety of the upper steel structure beam 102 installed on the lower steel structure beam 101.

[0042] Furthermore, in the radial direction of the furnace bottom, an inner ring radial gap is defined between the first inner ring stopper 1012 and the corresponding second inner ring stopper 1021, and / or an outer ring radial gap is defined between the first outer ring stopper 1013 and the corresponding second outer ring stopper 1022. By providing the inner ring radial gap and / or the outer ring radial gap, the required spatial margin for thermal expansion and deformation of the upper steel structure beam 102 is met, effectively reducing / avoiding mechanical seizures of the furnace bottom caused by plastic deformation of the upper steel structure beam 102, and improving the operational reliability and safety of the rotary hearth furnace.

[0043] Preferably, there are multiple sets of inner ring limiter assemblies, which are spaced apart along the circumference of the furnace bottom, and / or there are multiple sets of outer ring limiter assemblies, which are spaced apart along the circumference of the furnace bottom. Providing multiple sets of limiter assemblies can improve the structural stability and reliability of the upper steel structure beam 102 mounted on the lower steel structure beam 101; preferably, multiple sets of inner ring limiter assemblies and multiple sets of outer ring limiter assemblies are provided.

[0044] In one embodiment, the inner ring radial gap and / or the outer ring radial gap are adjustable, so that the inner ring radial gap / outer ring radial gap can be adjusted according to the furnace temperature, while reliably constraining the upper steel structure beam 102 and ensuring that the upper steel structure beam 102 is not fixedly connected to the lower steel structure beam 101.

[0045] For limit components with adjustable radial clearance, such as Figure 5 Optionally, one of the limiting parts is a limiting block, and the other limiting part includes a bolt seat installed on the corresponding structural beam and an adjusting bolt threadedly connected to the bolt seat, the axis of the adjusting bolt is parallel to the radial direction of the furnace bottom, and one end of the adjusting bolt is close to the limiting block and forms a radial gap.

[0046] For radial clearance fixed limit components, such as Figure 5 Optionally, one of the limiting parts is a limiting block, and the other limiting part is a limiting block, and a radial gap is formed between the limiting blocks.

[0047] In this embodiment, including but not limited to:

[0048] The inner ring limit assembly adopts the above-mentioned limit stopper-adjusting bolt structure, that is, the inner ring limit assembly is a limit assembly with adjustable radial clearance, and the inner ring radial clearance is adjustable;

[0049] The outer ring limit assembly adopts the above-mentioned limit block-limit block structure, that is, the outer ring limit assembly is a limit assembly with a fixed radial gap, and the outer ring radial gap is not adjustable (obviously excluding the factor of the outer ring radial gap change caused by the plastic deformation of the upper steel structure beam 102).

[0050] Preferably, if Figure 5 In the furnace bottom radial direction, the first inner ring stopper 1012 is located on the side of the corresponding second inner ring stopper 1021 that is away from the furnace bottom axis, and the first outer ring stopper 1013 is located on the side of the corresponding second outer ring stopper 1022 that is closer to the furnace bottom axis. This design facilitates the placement of the various stoppers and the installation of the upper steel structure beam 102.

[0051] In one embodiment, in the initial state (ie before baking), the radial clearance of the inner ring is within the range of 8 to 15 mm, and the radial clearance of the outer ring is within the range of 8 to 15 mm, preferably controlled at about 10 mm.

[0052] Among them, Figure 5 The upper steel beam 102 and the lower steel beam 101 are assembled to form a ring-shaped saddle structure. The top of the upper steel beam 102 is lined with refractory material. The pellets to be heated and reduced are placed on the surface of the refractory material and rotate in a circular motion with the furnace bottom frame 100 to heat and reduce the pellets.

[0053] Preferably, if Figure 5 The inner ring beam of the lower steel structure beam 101 is a ring structure formed by bending an I-beam, and is welded with a ring centering track 1014; the outer ring beam of the lower steel structure beam 101 is a ring structure formed by bending an I-beam, and is connected to the pin gear ring 1015.

[0054] Preferably, if Figure 5 An inner ring scraper holder 10231 is installed at the bottom of the inner ring of the upper steel structure beam 102, and an outer ring scraper holder 10232 is installed at the bottom of the outer ring of the upper steel structure beam 102; an inner ring side plate 10241 is installed at the top of the inner ring of the upper steel structure beam 102, and an outer ring side plate 10242 is installed at the top of the inner ring of the upper steel structure beam 102. The inner ring side plate 10241 and the outer ring side plate 10242 can form a water-cooled sealing groove with the furnace bottom to prevent heat from radiating downward, so as to protect the furnace bottom drive device and rollers, centering rollers and other devices below.

[0055] In one embodiment, Figure 5 The cross-sectional centerline 1020 of the upper steel structure beam 102 is offset from the cross-sectional centerline 1010 of the lower steel structure beam 101. This design can prevent the thermal stress deformation from being concentrated in one place; the deviation e between the two can be determined based on factors such as the design value of the annular diameter of the furnace bottom frame 100 and the heat transfer temperature.

[0056] Preferably, if Figure 3 and Figure 4 The lower steel structure beam 101 is formed by splicing multiple groups of lower fan-shaped beams 1011, and the upper steel structure beam 102 is formed by splicing multiple groups of upper fan-shaped beams; wherein, a lower beam splicing position 10110 is formed between every two adjacent groups of lower fan-shaped beams 1011, and an upper beam splicing position is formed between every two adjacent groups of upper fan-shaped beams. Preferably, the lower beam splicing position 10110 and the upper beam splicing position are staggered to ensure the force performance and operational reliability of the furnace bottom frame 100, that is, the projection of each lower beam splicing position 10110 on the horizontal plane and the projection of each upper beam splicing position on the horizontal plane are staggered in sequence, and the misalignment between the lower beam splicing position 10110 and the adjacent upper beam splicing position is preferably 4 to 10°, and more preferably about 6°.

[0057] In one embodiment, there is an annular gap between each two adjacent groups of lower fan-shaped beams 1011 to prevent thermal expansion, extrusion and deformation between the lower fan-shaped beams 11; the annular gap is in the range of 8 to 15 mm, and is preferably controlled at about 10 mm.

[0058] Furthermore, the out-of-roundness tolerance of the circular ring formed by splicing the lower fan-shaped beams 1011 is within the range of ±10 mm.

[0059] In one embodiment, each two adjacent groups of lower fan-shaped beams 1011 are spliced ​​together by multiple connecting bolts, and the bolt connection position is close to the inner ring side of the lower steel structure beam 101, and the outer ring side of the lower steel structure beam 1 is not fixed, so as to avoid thermal expansion, deformation and damage to the lower steel structure beam 1 due to full circumferential fixation.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary hearth furnace comprising a furnace bottom frame and a furnace bottom drive device, characterized in that: A pin gear ring is provided on the furnace bottom frame, and the furnace bottom driving device includes a pin gear, a hydraulic motor reducer and a reciprocating drive mechanism. The reciprocating drive mechanism includes a guide rail seat, a guide rail and a reciprocating power unit. The hydraulic motor reducer is installed on the guide rail, and the pin gear is installed at the output end of the hydraulic motor reducer. The guide rail is slid on the guide rail seat and one end is connected to the output end of the reciprocating power unit so that the pin gear has a transmission position engaged with the pin gear ring and a standby position away from the pin gear ring.

2. The rotary hearth furnace according to claim 1, wherein: The guide rail seat is provided with a C-shaped guide groove, and fixed slides are provided on the groove walls on both sides of the C-shaped guide groove. Movable slides are matched and provided in equal numbers on the guide rail, and each movable slide is slidably arranged on each fixed slide in a one-to-one correspondence.

3. The rotary hearth furnace according to claim 2, wherein: In the C-shaped guide groove, the surface of one of the fixed slide plates is parallel to the horizontal plane, and the other fixed slide plate is arranged obliquely relative to the horizontal plane.

4. The rotary hearth furnace according to claim 2, wherein: The guide rail seat comprises two guide rail blocks arranged opposite to each other on both sides of the guide rail, the two guide rail blocks are both provided with the C-shaped guide groove, and the notches of the two C-shaped guide grooves are opposite to each other.

5. The rotary hearth furnace according to any one of claims 1 to 4, characterized in that: There are two guide rail seats, which are respectively arranged on both sides of the hydraulic motor reducer along the movable direction of the guide rail.

6. The rotary hearth furnace according to claim 1, wherein: The invention also includes a detection unit for detecting whether the pin gear is meshed with the pin gear ring.

7. The rotary hearth furnace according to claim 6, wherein: The detection unit includes a first sensing element arranged on the guide rail and a second sensing element installed near the guide rail through a sensing bracket. Among the first sensing element and the second sensing element, one sensing element is a sensing plate and the other sensing element is a sensing switch.

8. The rotary hearth furnace according to claim 1, wherein: It also includes an encoder, which is installed on the guide rail through an encoder bracket and connected to the output end of the hydraulic motor reducer.

9. The rotary hearth furnace according to claim 1, wherein: The reciprocating power unit includes a hydraulic cylinder.

10. The rotary hearth furnace according to claim 1, wherein: There are multiple groups of furnace bottom driving devices, which are sequentially spaced apart along the circumference of the furnace bottom frame.

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