Feeding device of rotary kiln

Abstract

The utility model discloses a rotary kiln feeding device which comprises a feeding bin, a chute, a material pushing groove, a material pushing machine and a control system, the bottom of the feeding bin is connected with the top end of the chute, the bottom end of the chute is connected with a material inlet of the material pushing groove, one end of the material pushing groove is communicated with a feeding port of a rotary kiln, the other end of the material pushing groove is provided with the material pushing machine, and the material pushing machine comprises a pushing cylinder and a pushing head. A first limiting switch is arranged on the pusher and used for determining that the pushing head is located at the preset position between the material inlet and the feeding port of the rotary kiln, an upper hydraulic inserting plate door and a lower hydraulic inserting plate door are arranged on the chute, a nitrogen filling device is connected between the upper hydraulic inserting plate door and the lower hydraulic inserting plate door, and the upper hydraulic inserting plate door, the lower hydraulic inserting plate door, the nitrogen filling device and the pusher are connected with a control system. According to the feeding device of the rotary kiln, the upper hydraulic slide plate gate, the lower hydraulic slide plate gate and the nitrogen filling device are arranged on the chute, and the limiting switch is arranged on the pusher, so that flames are effectively controlled to return to the feeding channel, and the tempering phenomenon of the feeding channel of the rotary kiln is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kiln equipment, in particular to a rotary kiln feeding device. Background Art

[0002] In the field of hazardous waste incineration, rotary kiln is a commonly used incineration equipment with the advantages of large processing capacity and strong adaptability. It is widely used in the harmless treatment of various hazardous wastes.

[0003] In the design of rotary kiln, the kiln head area is usually designed to be slightly negative pressure to maintain stable flame combustion and prevent external air from entering. However, the temperature of the kiln head is relatively high, usually above 500℃. If fire prevention measures are not in place, strong heat radiation or tempering may ignite the material in the push chute. More seriously, once the fire spreads, it may also cause the combustion of materials in the chute or silo, thus causing serious safety accidents, which not only threatens the life safety of the staff, but also damages the equipment, seriously affecting the normal production and operation of the rotary kiln. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a rotary kiln feeding device, wherein an upper hydraulic plug-in door, a lower hydraulic plug-in door, and a nitrogen filling device are arranged on the chute, and a limit switch is arranged on the pusher, so as to effectively control the flame to return to the feeding channel and prevent the flashback phenomenon in the rotary kiln feeding channel.

[0005] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0006] A rotary kiln feeding device comprises a feeding bin, a chute, a pusher trough, a pusher and a control system, the pusher comprising a push cylinder and a pusher head, the push cylinder is arranged at the outer periphery of the pusher head, the feeding bin is connected to the top end of the chute, the bottom end of the chute is connected to the material inlet of the pusher trough, one end of the pusher trough is connected to the rotary kiln feeding port, and the pusher is arranged at the other end, the chute is provided with an upper hydraulic plug-in door and a lower hydraulic plug-in door, a nitrogen filling device is connected between the upper hydraulic plug-in door and the lower hydraulic plug-in door, the pusher is provided with a first limit switch, the first limit switch is used to determine that the pusher head is in a preset position between the material inlet and the rotary kiln feeding port, the control system is connected with the upper hydraulic plug-in door, the lower hydraulic plug-in door, the pusher and the nitrogen filling device, and the control system automatically controls the operation of the upper hydraulic plug-in door, the lower hydraulic plug-in door, the pusher and the nitrogen filling device.

[0007] According to one aspect of the utility model, the pusher is also provided with a second limit switch and a third limit switch, the second limit switch is used to determine that the pusher is in place, and the third limit switch is used to determine that the pusher head is in a position to reset the material entrance.

[0008] According to one aspect of the utility model, the volume between the upper hydraulic gate and the lower hydraulic gate is larger than the volume of the feed bin.

[0009] According to one aspect of the utility model, the feed bin is a feed bin that is wide at the top and narrow at the bottom.

[0010] According to one aspect of the utility model, the feed bin and the chute are softly connected.

[0011] According to one aspect of the utility model, a weighing sensor is arranged on the feed bin.

[0012] According to one aspect of the utility model, an air inlet is provided on the chute, and the air inlet is connected to the nitrogen filling device.

[0013] According to one aspect of the utility model, the upper hydraulic slide door and the lower hydraulic slide door are driven by a hydraulic system.

[0014] According to one aspect of the utility model, the pusher is a hydraulic pusher.

[0015] According to one aspect of the utility model, the pusher head is made of high temperature resistant alloy.

[0016] Advantages of the implementation of the utility model: A rotary kiln feeding device, including a feeding bin, a chute, a nitrogen filling device, a pusher chute, a pusher and a control system. The chute is provided with an upper hydraulic plug-in door and a lower hydraulic plug-in door. The upper hydraulic plug-in door realizes physical isolation between the chute and the feeding bin, and the lower hydraulic plug-in door realizes physical isolation from the pusher chute. When the upper and lower hydraulic plug-in doors are closed at the same time, a relatively sealed storage space is formed, and nitrogen is filled into this space through the nitrogen filling device to reduce the oxygen content. When the pushing is completed, the pusher head is withdrawn, and when the pusher head returns to the preset position between the material inlet and the rotary kiln feed port, the first limit switch feeds back real-time information to the control system, thereby ensuring that only the kiln head and the pusher head are connected. By utilizing the barrier effect of the pusher head, the flame will not spread to the chute when the kiln head is tempered, and the flame can be effectively controlled to return to the feeding channel to prevent the tempering phenomenon of the rotary kiln feeding channel. At the same time, during this process, the upper hydraulic gate and the lower hydraulic gate are kept closed, and a nitrogen filling device is set to further ensure that the flame in the rotary kiln will not ignite the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 creative work.

[0018] Figure 1 It is a structural schematic diagram of a rotary kiln feeding device described in the utility model;

[0019] Figure 2 yes Figure 1 A left side view of the rotary kiln feed device is provided;

[0020] Figure 3 yes Figure 1 A top view of the rotary kiln feed device is provided.

[0021] Figure 1 , Figure 2 , Figure 3 Among them, 1. feed bin; 2. chute; 3. material inlet; 4. upper hydraulic plug door; 5. lower hydraulic plug door; 6. first limit switch; 7. third limit switch; 8. second limit switch; 9. push head; 10. rotary kiln feed port; 11. weighing sensor. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1 , Figure 2 , Figure 3 As shown, a rotary kiln feeding device includes a feeding bin 1, a chute 2, a pusher chute, a pusher and a control system, the pusher includes a push cylinder and a pusher head 9, the pusher cylinder is arranged on the outer periphery of the pusher head 9, the feeding bin 1 is connected to the top of the chute 2, the bottom of the chute 2 is connected to the material inlet 3 of the pusher chute, one end of the pusher chute is connected to the rotary kiln feeding port 10, and the pusher is arranged at the other end, the chute 2 is provided with an upper hydraulic plug-in door 4 and a lower hydraulic plug-in door 5, a temporary bin is formed between the upper hydraulic plug-in door 4 and the lower hydraulic plug-in door 5, and a nitrogen filling device is connected between the upper hydraulic plug-in door 4 and the lower hydraulic plug-in door 5. The pusher is provided with a first limit switch 6, which is used to determine that the pusher head 9 is located between the material inlet 3 and the rotary kiln feed port 10. The control system is connected with the upper hydraulic gate door 4, the lower hydraulic gate door 5 and the pusher, and the control system automatically controls the operation of the upper hydraulic gate door 4, the lower hydraulic gate door 5 and the pusher. Specifically, the first limit switch 6 is triggered when the pusher head 9 moves to a preset position between the material inlet 3 and the rotary kiln feed port 10, thereby sending a signal to the control system to confirm that the pusher head 9 has reached the preset position.

[0027] In actual application, the upper hydraulic gate door 4 and the lower hydraulic gate door 5 cannot be opened at the same time. When the material level of the upper feed bin 1 reaches the set value, the upper hydraulic gate door 4 automatically opens to allow the material to enter the chute 2. At this time, the lower hydraulic gate door 5 remains closed to prevent the material from directly entering the rotary kiln. After the material enters the chute 2 through the upper hydraulic gate door 4, the upper hydraulic gate door 4 is closed to ensure that the material in the chute 2 does not overflow. Subsequently, the lower hydraulic gate door 5 opens to allow the material in the chute 2 to be discharged from the material inlet 3 of the pusher chute into the pusher chute. When unloading, the pusher is in the initial position and retreats to its position. The material falls through the chute 2 in front of the pusher head 9. The lower hydraulic gate door 5 is closed after the material falls into the pusher. At this time, the pusher starts to work, and the pusher pushes the pusher head 9 to push the material into the rotary kiln for incineration. When the pushing is completed, the pusher head 9 withdraws. When the pusher head 9 returns to the preset position between the material inlet 3 and the rotary kiln feed port 10, the first limit switch 6 feeds back the real-time information to the control system, thereby ensuring that only the kiln head and the pusher head 9 are connected. By using the barrier effect of the pusher head 9, the flame will not spread to the chute 2 when the kiln head is tempered, and the flame can be effectively controlled to return to the feed channel to prevent the tempering phenomenon of the rotary kiln feed channel and the kiln head from tempering. At the same time, during this process, the upper hydraulic plug-in door 4 and the lower hydraulic plug-in door 5 are both kept closed, and a nitrogen filling device is set between the upper hydraulic plug-in door 4 and the lower hydraulic plug-in door 5. The control system controls the filling amount of nitrogen to reduce the oxygen content, further ensuring that the flame in the rotary kiln will not flow back.

[0028] In practical applications, an air inlet is provided on the temporary silo formed between the upper hydraulic gate 4 and the lower hydraulic gate 5, and the air inlet is used to introduce nitrogen to control the oxygen content in the temporary silo. The nitrogen filling device includes a pipeline and a nitrogen source, and the nitrogen source is connected to the air inlet through the pipeline, so as to introduce nitrogen into the chute 2. The control system monitors the oxygen content in the chute 2 in real time, and adjusts the working state of the nitrogen filling device as needed to ensure that the oxygen content in the chute 2 is controlled within a safe range. Generally, the oxygen content is controlled below 3%, thereby effectively preventing the risk of material combustion caused by excessive oxygen content.

[0029] In practical applications, the pusher is also provided with a second limit switch 8 and a third limit switch 7. The second limit switch 8 is used to monitor and determine that the pusher has pushed the material in place, and the third limit switch 7 is used to determine that the pusher head 9 is in the accurate position of the material entrance reset. Specifically, when the pusher head 9 of the pusher pushes the material completely into the rotary kiln and reaches the preset pushing position, the second limit switch 8 is triggered and sends a signal to the control system that the material is pushed in place. After receiving the signal, the control system will stop the pushing action of the pusher and prepare for the next operation. When the pusher needs to retreat to the initial position for the next push, when the pusher completely retreats to the preset initial position, the third limit switch 7 is triggered and sends a signal to the control system that it retreats in place. After receiving the signal, the control system will confirm that the pusher has returned to a safe position and is ready for the next feeding and pushing operation. Specifically, the first limit switch 6, the second limit switch 8 and the third limit switch 7 are all electrically connected to the control system, and the control system uses an intelligent control algorithm to automatically control the operation of each limit switch. By setting a plurality of limit switches, accurate control of the forward and backward positions of the push head 9 is achieved, and the flame is effectively controlled to return to the feed channel.

[0030] In actual application, the push cylinder is arranged on the outer periphery of the push head 9 to form a protective shell, which not only protects the push head 9, but also prevents the material from scattering during the pushing process. Specifically, the pusher can be selected as a hydraulic pusher, and the pusher head 9 is connected to the piston end of the hydraulic pusher. During operation, the hydraulic pusher provides power through the hydraulic system to drive the piston end to reciprocate. When the piston end pushes forward, the pusher head 9 moves forward accordingly to push the material into the rotary kiln; when the piston end retracts backward, the pusher head 9 moves backward accordingly. Furthermore, the pusher head 9 is made of high-temperature resistant alloy, such as nickel-based alloy, tungsten-based alloy, etc., which can work at extremely high temperatures and is not easily eroded by flames.

[0031] In practical applications, the power of the upper hydraulic plug-in door 4 and the lower hydraulic plug-in door 5 both comes from the hydraulic system, and can respond to control signals quickly and accurately.

[0032] In practical applications, the volume between the upper hydraulic gate 4 and the lower hydraulic gate 5 is greater than the volume of the feed bin 1, so it can play the role of buffer storage, prevent material overflow, adapt to material flow fluctuations and facilitate maintenance, thereby improving overall performance and reliability.

[0033] In practical applications, the feed bin 1 is a feed bin 1 that is wide at the top and narrow at the bottom, which not only allows the material to enter the feed bin 1 more smoothly and reduces the possibility of material blockage, but also limits the backflow of flames or hot gases and reduces the risk of flashback. In addition, the feed bin 1 is softly connected to the chute 2. This design not only improves the flexibility of the system, but also ensures the accuracy of measurement.

[0034] In practical applications, a weighing sensor 11 is provided on the feed bin 1, and the weighing sensor 11 is connected to a control system. When working, the weighing sensor 11 can detect the weight of the material in the feed bin 1 in real time and accurately, and transmit the data to the control system. The control system can generate detailed batch measurement data and cumulative measurement data reports by processing the data of the weighing sensor 11, thereby facilitating real-time monitoring of the feeding frequency and the weight of the material in each batch of the feed bin 1.

[0035] Advantages of the implementation of the utility model: A rotary kiln feeding device, including a feeding bin, a chute, a pusher, a pusher and a control system. The chute is provided with an upper hydraulic plug-in door, a lower hydraulic plug-in door and a nitrogen filling device. The upper hydraulic plug-in door realizes the physical isolation of the chute and the feeding bin, and the lower hydraulic plug-in door realizes the physical isolation from the pusher chute. When the upper and lower hydraulic plug-in doors are closed at the same time, a relatively sealed storage space is formed, and nitrogen is filled into this space through the nitrogen filling device to reduce the oxygen content. When the pushing is completed, the pusher head is withdrawn, and when the pusher head returns to the preset position between the material inlet and the rotary kiln feed port, the first limit switch feeds back the real-time information to the control system, thereby ensuring that only the kiln head and the pusher head are connected. By utilizing the barrier effect of the pusher head, the flame will not spread to the chute when the kiln head is tempered, and the flame can be effectively controlled to return to the feeding channel to prevent the tempering phenomenon of the rotary kiln feeding channel. At the same time, during this process, the upper hydraulic gate and the lower hydraulic gate are kept closed, and a nitrogen filling device is set to further ensure that the flame in the rotary kiln will not ignite the material.

[0036] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A rotary kiln feeding device, comprising a feeding bin, a chute, a pusher trough, a pusher and a control system, wherein the pusher comprises a pusher cylinder and a pusher head, wherein the pusher cylinder is arranged at the periphery of the pusher head, the feeding bin is connected to the top of the chute, the bottom of the chute is connected to the material inlet of the pusher trough, one end of the pusher trough is connected to the rotary kiln feeding port, and the other end is provided with the pusher, characterized in that: The chute is provided with an upper hydraulic gate and a lower hydraulic gate, a nitrogen filling device is connected between the upper hydraulic gate and the lower hydraulic gate, the pusher is provided with a first limit switch, the first limit switch is used to determine that the pusher head is in a preset position between the material inlet and the rotary kiln feed port, the control system is connected with the upper hydraulic gate, the lower hydraulic gate, the pusher and the nitrogen filling device, and the control system automatically controls the operation of the upper hydraulic gate, the lower hydraulic gate, the pusher and the nitrogen filling device.

2. A rotary kiln feeding device as claimed in claim 1, characterized in that: The pusher is also provided with a second limit switch and a third limit switch, wherein the second limit switch is used to determine that the material is pushed into place, and the third limit switch is used to determine that the pusher head is in a position where the material entrance is reset.

3. A rotary kiln feeding device as claimed in claim 2, characterized in that: The volume between the upper hydraulic gate and the lower hydraulic gate is greater than the volume of the feed bin.

4. A rotary kiln feeding device as claimed in claim 3, characterized in that: The feeding bin is a feeding bin which is wide at the top and narrow at the bottom.

5. A rotary kiln feeding device as claimed in claim 4, characterized in that: The feed bin and the chute are softly connected.

6. A rotary kiln feeding device as claimed in claim 5, characterized in that: A weighing sensor is arranged on the feeding bin.

7. A rotary kiln feeding device as claimed in claim 1, characterized in that: The chute is provided with an air inlet hole, and the nitrogen filling device is connected to the air inlet hole.

8. A rotary kiln feeding device as claimed in claim 1, characterized in that: The upper hydraulic plug-in door and the lower hydraulic plug-in door are driven by a hydraulic system.

9. A rotary kiln feeding device as claimed in claim 1, characterized in that: The pusher is a hydraulic pusher.

10. A rotary kiln feeding device according to claim 1, characterized in that: The pusher head is made of high temperature resistant alloy.

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