Multi-section roasting furnace with lifting central shaft

Abstract

The utility model provides a multi-section roasting furnace with a lifting central shaft. The multi-section roasting furnace with the lifting center shaft comprises a base, multiple layers of hearths and a top seat which are sequentially arranged from bottom to top, a lifting mechanism, a driving mechanism and a cooling mechanism are arranged in the base, a rake arm is arranged in each layer of hearth, the center shaft penetrates through all the hearths, the upper end of the center shaft is movably connected with the top seat, and the lower end of the center shaft is movably connected with the top seat. The lower end of the center shaft is movably connected with the top of the lifting mechanism, the middle of the center shaft is connected with all the rake arms, the driving mechanism and the cooling mechanism are both fixedly arranged in the base, and the center shaft is connected with the driving mechanism through a transmission mechanism capable of moving relative to the center shaft and connected with the cooling mechanism through a hose. The multi-section roasting furnace with the lifting center shaft solves the problems that the load of a lifting device is too large, stable lifting is difficult to guarantee and the like.

Description

Technical Field

[0001] The utility model relates to the field of multi-stage roasting furnaces, in particular to a multi-stage roasting furnace with a lifting center axis. Background Art

[0002] The main sources of zinc oxide in a hydrometallurgical zinc smelting plant are: zinc oxide obtained by volatilization of leaching slag and zinc oxide obtained by fuming slag from the upper process. Zinc oxide contains a large amount of impurities such as fluorine and chlorine that are harmful to zinc electrodeposition. Its main forms are ZnCl2, PbCl2, ZnF2, PbF2, GaF2, NaF, NaCl, KCl, etc. At present, multi-chamber roasting furnaces are generally used for treatment. Relying on the volatilization reaction of fluorides and chlorides, under high temperature conditions in the furnace, low-boiling fluorides and chlorides are decomposed into gaseous states and removed with the flue gas into the flue gas dust removal device. In addition to being used for defluorination and dechlorination of zinc oxide, multi-chamber roasting furnaces are also widely used in many fields such as molybdenite desulfurization, activated carbon regeneration, sludge pyrolysis, wastewater treatment, food sugar adsorption decolorization and refining.

[0003] In the above-mentioned processing, it is common that the material forms a molten compound or an easy-to-stick state at a certain temperature, which will cause the material to form a sticking resistance to the rake arm and rake teeth, so that the furnace cannot operate normally and affect production. In severe cases, the rake arm may be twisted off or even the central axis may be damaged. When a traditional multi-chamber furnace encounters a similar situation, the only measure is to stop the furnace and manually clean up the material. When the furnace is stopped when the situation is discovered, it is very likely that the rake arm has been broken.

[0004] For this purpose, there is a solution with application number 202121118572.1, but in this solution, the central axis needs to be raised and lowered synchronously with the driving mechanism and the cooling mechanism. There are problems such as the load of the lifting device is too large, and it is difficult to ensure that the lifting process is sufficiently stable. Utility Model Content

[0005] In order to solve the problems of excessive load on the lifting device and difficulty in ensuring smooth lifting, the utility model provides a multi-stage roasting furnace with a central axis lifting to solve the above problems.

[0006] A multi-stage roasting furnace with a central axis lifting, comprising a base, a multi-layer furnace chamber, and a top seat arranged in sequence from bottom to top, wherein the base is provided with a lifting mechanism, a driving mechanism, and a cooling mechanism, and each layer of the furnace chamber is provided with a rake arm, the central axis runs through all the furnace chambers, the upper end is movably connected to the top seat, the lower end is movably connected to the top of the lifting mechanism, and the middle is connected to all the rake arms, the driving mechanism and the cooling mechanism are both fixedly arranged in the base, the central axis is connected to the driving mechanism through a transmission mechanism that can move relative to the central axis, and is connected to the cooling mechanism through a hose

[0007] In a preferred embodiment of the multi-stage roasting furnace with a central axis lift provided by the utility model, the lifting mechanism includes a lifting cylinder and a lifting platform, one or more of the lifting cylinders are vertically arranged on the ground, and the top is sequentially connected to the lifting platform and the central axis. The lifting mechanism also includes multiple foundations, which are arranged on the ground, and one or more guide rods are vertically arranged on the top to connect to the lifting platform.

[0008] In a preferred embodiment of the multi-stage roasting furnace with a central axis lifting provided by the utility model, a rotating platform is provided at the bottom of the bottom furnace, and the bottom of the rotating platform is connected to a transmission gear with a tooth surface facing downward, and the transmission gear can rotate relative to the furnace, and the transmission gear is connected to the driving mechanism provided on the ground through a support. The central axis is connected to the transmission gear through a tooth groove extending in the vertical direction, and the length of the tooth groove is greater than or equal to the stroke of the lifting cylinder.

[0009] In a preferred embodiment of the multi-stage roasting furnace with a central axis lifting provided by the utility model, it also includes a control system, which includes a detection unit connected to the driving mechanism, an execution unit connected to the lifting mechanism, and a control unit connected to the detection unit and the execution unit.

[0010] In a preferred embodiment of the multi-stage roasting furnace with a central axis lifting provided by the utility model, a hydraulic station is also included, the driving mechanism is a hydraulic motor, the lifting cylinder is a hydraulic cylinder, and the hydraulic station is connected to the driving mechanism and the lifting cylinder through an oil circuit. The execution unit includes an execution solenoid valve arranged in the oil circuit connecting the hydraulic cylinder and the hydraulic station, and the control unit includes a PLC controller, and the PLC controller is connected to the oil pressure monitoring switch and the execution solenoid valve through a circuit.

[0011] Compared with the prior art, the multi-stage roasting furnace with central axis lifting provided by the utility model connects the driving mechanism and the cooling mechanism to the central axis through a mechanism that can move relative to the central axis, so that the central axis can be lifted and lowered separately. Under the design of lifting the central axis separately, the load of the lifting mechanism can be greatly reduced, and the multiple lifting cylinders in the lifting mechanism can be reduced to a single one, solving the problems of heavy load and unstable lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of a multi-stage roasting furnace with a central axis lifting;

[0013] Figure 2 yes Figure 1 A partial enlarged view of

[0014] Figure 3 It is the schematic diagram of the hydraulic station in a multi-stage roasting furnace with a central axis lifting and lowering. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0016] Please also see Figure 1 and Figure 2 , respectively, are a schematic structural diagram of a multi-stage roasting furnace 1 with a lifting center axis provided by the present invention, and a partial enlarged diagram thereof.

[0017] The multi-stage roasting furnace 1 with a central axis lifting comprises a base 2, a ten-layer furnace 3, a top seat 4, a central axis 5, a hydraulic motor 6, a blower, a lifting mechanism 7, a hydraulic station 8, and a control system, which are arranged on the ground in sequence from bottom to top in the vertical direction.

[0018] The base 2 includes six vertically arranged columns (only the columns on both sides are drawn in the attached figure to avoid cluttering the picture), and ten layers of furnaces 3 and top seat 4 are arranged on the top of the base 2 in sequence. The top seat 4 is provided with a feed port penetrating to the furnace 3 on the top layer, a material transfer port is provided between adjacent furnaces 3, and the furnace 3 on the bottom layer is provided with a discharge port penetrating to the outside.

[0019] The central shaft 5 passes through the center of all the furnaces 3 in the vertical direction, and is movably connected to the top seat 4 through a bearing at the top. A sleeve is provided between the furnaces 3 for the central shaft 5 to pass through. Multiple rake arms 31 are provided in each layer of the furnace 3 and connected to the central shaft 5. As the central shaft 5 rotates, all the rake arms 31 are driven to rotate and rake materials in all the furnaces 3.

[0020] The lifting mechanism 7 includes a lifting hydraulic cylinder 71 and two foundations 72, and the lifting hydraulic cylinder 71 and the foundation 72 are arranged on the ground. The lifting hydraulic cylinder 71 is located directly below the central axis 5, and the foundations 72 are arranged on both sides of the lifting hydraulic cylinder 71. A guide rod 73 is provided on the top of each foundation 72. The lifting hydraulic cylinder 71 and the guide rod 73 are both vertically arranged, and a horizontally laid lifting platform 74 is connected to the top of the two. Another bearing is provided on the top of the lifting platform 74 and is movably connected to the bottom end of the central axis 5. The lifting mechanism 7 can drive the central axis 5 to rise and fall as a whole without affecting the rotation of the central axis 5.

[0021] The central shaft 5 is provided with an air bag 52 and a blower near the bottom (they are covered by the air bag 52 in the figure and therefore not marked), that is, the cooling mechanism is connected through a hose. The blower is fixed to the ground through a bracket and does not move with the lifting of the central shaft 5.

[0022] The central shaft 5 is a hollow shaft, and an opening is provided at the position of the air bag 52 to communicate with it. The air bag 52 is a rotary joint structure. The blower sends outside air into the central shaft 5 through the hose and the air bag 52, which cools the central shaft 5 on the one hand and preheats the fuel gas on the other hand. The air blown into the central shaft 5 from the blower is finally returned directly to the burner from the outlet air duct at the top of the central shaft 5 after being heated, and the hot air is sent to the gas nozzle of the combustion chamber.

[0023] The outer wall of the central shaft 5 between the furnace 3 at the bottom and the air bag 52 is provided with a tooth groove 51 extending up and down. A transmission gear 61 is arranged outside the tooth groove 51, and the transmission gear 61 is connected with the central shaft 5 through the tooth groove 51. The transmission gear 61 can drive the central shaft 5 to rotate, and since the tooth groove 51 extends up and down, it does not affect the lifting and lowering of the central shaft 5.

[0024] The length of the tooth groove 51 is greater than the stroke of the lifting hydraulic cylinder 71 to ensure that the central shaft 5 does not cause impact in the up-and-down directions on the transmission gear 61 during the lifting process.

[0025] At the bottom of the furnace 3 at the bottom layer, there is a rotating platform 62 arranged around the central axis 5, the top of the outer ring is fixed to the bottom of the furnace 3 at the bottom layer, and the bottom of the inner ring is connected to the transmission gear 61. That is, the transmission gear 61 is installed at the bottom of the furnace 3 through the rotating platform 62. The tooth surface of the transmission gear 61 faces downward and engages with the hydraulic motor 6, that is, the output end of the driving mechanism. The hydraulic motor 6 is fixed to the ground by a bracket and does not move with the rise and fall of the central axis 5. The reduction device, transmission device, etc. of the hydraulic motor 6 will not be described in detail.

[0026] See also Figure 3 , is a schematic diagram of a hydraulic station 8 in a multi-stage roasting furnace 1 with a central axis lift provided by the present invention.

[0027] The hydraulic station 8 is roughly divided into several parts, including an oil tank 81, an oil inlet valve group 82, an oil return valve group 83, a motor control valve group 84, and a lifting control valve group 85. The oil inlet end of the oil inlet valve group 82 is connected to the oil tank 81, and the two oil outlet ends are connected to the motor control valve group 84 and the lifting control valve group 85 respectively. The oil outlet end of the oil return valve group 83 is connected to the oil tank 81, and the two oil inlet ends are connected to the motor control valve group 84 and the lifting control valve group 85 respectively. The motor control valve group 84 and the lifting control valve group 85 are connected to the hydraulic motor 6 and the lifting hydraulic cylinder 71 respectively.

[0028] The control system includes pressure sensors 86 provided at the motor control valve group 84 and at the oil inlet and outlet of the hydraulic motor 6, and a PLC controller. The PLC controller is connected to all pressure sensors 86 and the solenoid valve circuit in the lifting control valve group 85 at the same time.

[0029] In specific implementation, the hydraulic station 8 drives the hydraulic motor 6, which drives the central shaft 5 to rotate through the transmission gear 61 fixed on the central shaft 5, and then drives all the rake arms 31 to rotate and rake materials in all the furnaces 3. The materials enter the furnace 3 at the top layer from the feed port, and are then swept into the next layer by the rake arms 31. The materials continue to move and fall layer by layer until they are discharged from the discharge port and sent to the downstream process through the cooling conveyor.

[0030] The fuel gas is sent to the burners of the combustion layer in the furnace 3 through pipelines, and burns at the nozzle outlet of the burner. The heat of combustion heats the materials in the furnace 3. The blower blows cold air into the central shaft 5 for cooling. The heated hot air is introduced into the nozzle from the top air duct, and is mixed with the fuel gas at the nozzle outlet to burn and heat the furnace 3. When the temperature reaches a certain range, the impurities and moisture in the material volatilize, and the preliminary treatment of the material is completed.

[0031] The exhaust gas and dust generated in the furnace 3 continuously gather toward the upper part of the furnace, and the induced draft fan installed on the exhaust gas duct extracts the exhaust gas and dust through the dust removal outlet.

[0032] The pressure sensor 86 monitors the oil circuit pressure in real time, that is, monitors the running resistance of the central shaft 5 in real time. When the preset safety threshold is exceeded, the PLC controller controls the extension of the lifting hydraulic cylinder 71 to push the central shaft 5 upward. When the central shaft 5 moves upward, all the rake arms 31 are also driven upward, thereby reducing the contact between the rake arms 31 and the molten viscous material, reducing the resistance, and avoiding equipment damage.

[0033] At the same time, the feeding can be reduced or stopped until the oil pressure drops to another preset threshold. At this time, the PLC controller controls the lifting hydraulic cylinder 71 to contract, and the central shaft 5 and the rake arm 31 move downward as a whole under the pulling effect and the deadweight of the central shaft 5 and the rake arm 31. During the lifting process, the rake arm 31 keeps pushing and turning the materials in the furnace 3.

[0034] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A multi-stage roasting furnace with a central axis lifting, comprising a base, a multi-layer furnace, and a top seat arranged in sequence from bottom to top, wherein the base is provided with a lifting mechanism, a driving mechanism, and a cooling mechanism, and each layer of the furnace is provided with a rake arm, the central axis runs through all the furnaces, the upper end is movably connected to the top seat, the lower end is movably connected to the top of the lifting mechanism, and the middle is connected to all the rake arms, characterized in that: The driving mechanism and the cooling mechanism are both fixedly arranged in the base, and the central axis is connected to the driving mechanism through a transmission mechanism that can move relatively therewith, and is connected to the cooling mechanism through a hose.

2. The multi-stage roasting furnace with a central axis lifting according to claim 1 is characterized in that: The lifting mechanism comprises a lifting cylinder and a lifting platform. One or more of the lifting cylinders are vertically arranged on the ground, and the tops are sequentially connected to the lifting platform and the central axis.

3. The multi-stage roasting furnace with a central axis lifting according to claim 2 is characterized in that: The lifting mechanism also includes a plurality of foundations, which are arranged on the ground, and one or more guide rods are vertically arranged on the top to connect with the lifting platform.

4. The multi-stage roasting furnace with a central axis lifting according to claim 2 or 3, characterized in that: A rotating platform is provided at the bottom of the bottom furnace, through which a transmission gear is connected, and the transmission gear is connected to the driving mechanism.

5. The multi-stage roasting furnace with a central axis lifting according to claim 4, characterized in that: The central axis passes through the center of the transmission gear and the rotating platform, does not contact the rotating platform, and is connected to the transmission gear through tooth grooves extending up and down, and the length of the tooth groove is greater than or equal to the stroke of the lifting cylinder.

6. The multi-stage roasting furnace with a central axis lifting according to claim 2 or 3, characterized in that: It also includes a control system, which includes a detection unit connected to the driving mechanism, an execution unit connected to the lifting mechanism, and a control unit connected to the detection unit and the execution unit.

7. The multi-stage roasting furnace with a central axis lifting according to claim 6, characterized in that: It also includes a hydraulic station, the driving mechanism is a hydraulic motor, the lifting cylinder is a hydraulic cylinder, and the hydraulic station is connected with the driving mechanism and the lifting cylinder through an oil circuit.

8. The multi-stage roasting furnace with a central axis lifting according to claim 7, characterized in that: The detection unit includes an oil pressure monitoring switch arranged at the oil inlet and outlet of the hydraulic motor, the execution unit includes an execution solenoid valve arranged in the oil circuit connecting the hydraulic cylinder and the hydraulic station, and the control unit includes a PLC controller, and the PLC controller is connected to the oil pressure monitoring switch and the execution solenoid valve through a circuit.

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