A lime rotary kiln preheater push head material return recovery device

Abstract

The application provides a lime rotary kiln preheater push head material return recovery device and relates to the technical field of lime calcination. The device comprises a preheater main body, a plurality of push heads are respectively arranged in a plurality of through channels formed in the preheater main body, one end of the through channel is connected with the outside world, and the other end is connected with a vertical feeding channel of the preheater main body; a layered space is formed between the upper part of the through channel and the upper part of the push head, two baffle structures are respectively connected with the two ends of the through channel, the distance between the bottom of each baffle structure and the upper part of the push head is less than 1.5 mm, a plurality of balls are arranged in the layered space, the push head is hollow, a plurality of through holes with a diameter less than 1.5 mm are arranged on the upper surface of the hollow part of the push head, the through holes are connected with the inside of the push head and the layered space, and the hollow space of the push head is connected with an external material collecting bin through a material guide pipe. The application can avoid the powder from sliding from the gap between the preheater main body and the push head, thereby reducing the waste of raw materials.

Description

Technical Field

[0001] This invention relates to the field of lime calcination technology, and in particular to a material recovery device for the pusher head of a lime rotary kiln preheater. Background Technology

[0002] A rotary kiln for lime production is a device that decomposes calcium carbonate powder into lime at high temperatures. The process requires high temperatures and generates high-temperature waste gas. To increase energy efficiency, the waste gas is introduced into a preheater, which allows for preliminary heating of the powder within the preheater. After preheating, the powder is pushed into a feed chute by a pusher, and then enters the rotary kiln for final calcination.

[0003] In related technologies, during the reciprocating feeding process of the preheater pusher, a material return phenomenon occurs, meaning that the powder does not enter the feeding chute but slides down from the gaps in the device, resulting in a large amount of raw material waste.

[0004] To address the above problems, there is an urgent need for a device that can recover the material returned by the pusher head. Summary of the Invention

[0005] This invention provides a device for recovering material from the pusher head of a lime rotary kiln preheater, capable of recovering material from the pusher head. The technical solution of this invention is as follows:

[0006] A material recovery device for a preheater pusher in a lime rotary kiln includes a preheater body and multiple pushers. The multiple pushers are respectively inserted into multiple through channels opened on the preheater body. One end of each through channel is connected to the outside, and the other end is connected to a vertical feed channel of the preheater body. One end of each pusher is connected to a hydraulic device installed on the outside of the preheater body.

[0007] A layered space is formed between the upper part of the through channel and the upper part of the pusher head. A baffle structure is connected to each end of the through channel. The upper part and the sides of the baffle structure are connected to the upper wall and the side edges of the through channel, respectively. The distance between the bottom of the two baffle structures and the upper part of the pusher head is less than 1.5 mm. Multiple spheres are placed in the layered space. The pusher head is hollow inside. Multiple through holes with a diameter of less than 1.5 mm are opened on the upper surface of the hollow part of the pusher head. The through holes connect the inside of the pusher head and the layered space. The hollow space inside the pusher head is connected to the external collection bin through a material guide pipe installed on the pusher head.

[0008] Preferably, a pressure roller device is installed in the layered space near the two baffle structures. The pressure roller device includes a connecting rod and a roller. The two ends of the connecting rod are respectively connected to the upper wall of the through channel and the rotating shaft of the roller. The roller and the upper part of the pusher are in rolling connection.

[0009] Preferably, the connecting rod is a sleeve structure, including an outer sleeve rod and an inner sleeve rod, the inner sleeve rod is inserted into a preset axial groove of the outer sleeve rod, and a spring is connected between the inner sleeve rod and the outer sleeve rod.

[0010] Preferably, the through hole is conical, with the smaller end located on the upper surface of the pusher head, and the larger end communicating with the hollow space inside the pusher head.

[0011] Preferably, multiple support columns are installed inside the hollow space of the pusher head.

[0012] Preferably, the hollow part inside the pusher head is located at one end away from the interior of the preheater body.

[0013] Preferably, the sphere is made of ceramic or metal alloy, the diameter of the sphere is 1-3 cm, and the volume of the sphere accounts for 60-80% of the volume of the layered space.

[0014] Preferably, the thickness of the layered space is 1.1 to 1.3 times the diameter of the sphere.

[0015] Preferably, the external collection bin is connected to the inlet of the dust removal device, and the outlet of the dust removal device is connected to the feed inlet of the preheater body.

[0016] Preferably, a sliding groove is provided at the bottom of the through channel, and a sliding block is installed at the bottom of the pusher head. The sliding groove and the sliding block are matched to limit the sliding direction of the pusher head.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] By setting up a preheater body and incorporating a feeding channel and a through channel for the reciprocating motion of the pusher head, a layered space is constructed using two baffle structures, the upper wall of the through channel, and the upper surface of the pusher head for recycling the returned material. The specific recycling process is as follows: the pusher head pushes the powder in the feeding channel into the discharge chute. During the retraction process, a small amount of fine powder from the upper part of the pusher head will still pass through the baffle structure and enter the layered space. The pusher head is hollow inside, and the upper surface of the hollow part has through holes. The powder entering the layered space can pass through these holes into the internal space of the pusher head, and then through the guide pipe into the external collection bin. By placing multiple spheres within a layered space, these spheres can move freely. As the pusher reciprocates, the spheres roll, collide, and rub within the layered space, which not only crushes the powder entering the layered space into smaller particles but also compresses the through-holes to prevent clogging. The ground fine powder is more easily fed into the pusher's interior through the through-holes by the air pump or its own weight, and then into the feed channel and external collection bin. In summary, this invention prevents powder from slipping through the gap between the preheater body and the pusher, thereby reducing raw material waste. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a lime rotary kiln preheater pusher material recovery device provided in an embodiment of the present invention;

[0021] Figure 2 This is a partial cross-sectional schematic diagram of a lime rotary kiln preheater pusher material recovery device provided in an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 Enlarged schematic diagram of the component within the dashed box;

[0023] Figure 4 This is a schematic diagram of the dust removal device in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the dust removal component in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the carbon fiber filter layer in an embodiment of the present invention.

[0026] In the picture:

[0027] 100-Preheater body; 101-Layered space; 102-Feeding channel; 103-Hydraulic device; 200-Push head; 201-Baffle structure; 202-Through hole; 203-Sphere; 204-Pressure roller device; 300-Guide pipe;

[0028] 400-External collection bin; 1-Cylindrical shell; 11-Collection bin; 2-Dust removal and filtration unit; 21-Plate; 22-Backflush pipe; 23-Annular insulating sheet; 24-Carbon fiber filter layer; 25-Conductive fiber filter layer; 26-Circular insulating sheet; 27-Insulating baffle; 3-Drive device; 4-Pretreatment channel. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 3 As shown, this embodiment provides a lime rotary kiln preheater pusher head material recovery device, including a preheater body 100 and a plurality of pushers 200. The plurality of pushers 200 are respectively inserted into a plurality of through channels opened in the preheater body 100. One end of the through channel is connected to the outside and the other end is connected to the vertical feed channel 102 of the preheater. One end of the pusher 200 is connected to a hydraulic device 103 installed outside the preheater body 100.

[0031] A layered space 101 is formed between the upper part of the through channel and the upper part of the pusher head 200. A baffle structure 201 is connected to each end of the through channel. The upper part and the sides of the baffle structure 201 are connected to the upper wall and the side edges of the through channel, respectively. The distance between the bottom of the two baffle structures 201 and the upper part of the pusher head 200 is less than 1.5 mm. Multiple spheres 203 are placed in the layered space 101. The pusher head 200 is hollow inside. Multiple through holes 202 with a diameter of less than 1.5 mm are opened on the upper surface of the hollow part of the pusher head 200. The through holes 202 connect the inside of the pusher head 200 and the layered space 101. The hollow space inside the pusher head 200 is connected to the external collection bin 400 through the material guide pipe 300 installed in the pusher head 200.

[0032] In this embodiment, most of the recycled material generated by the pusher 200 is carried out through the gap between the pusher 200 and the preheater body 100. The gap between the pusher 200 and the preheater body 100 is inevitable. Due to the switching between high and normal temperatures in its working environment, the presence of thermal stress prevents them from fitting perfectly together. Therefore, after assembly, a gap of less than 1.5mm will remain, leading to recycled material from the pusher 200. Therefore, this embodiment designs a special pusher recycled material recovery device, including the preheater body 100. The preheater body 100 includes a feeding channel 102 and a through channel for the reciprocating motion of the pusher 200. Through the reciprocating motion of the pusher 200, the powder in the feeding channel 102 can be pushed into the discharge chute connected downstream of the feeding channel 102. To recover the recycled material from the pusher 200, a layered space 101 is constructed using two baffle structures 201, the upper wall of the through channel, and the upper surface of the pusher 200 for recycling the recycled material. The specific recycling process is as follows: the pusher 200 pushes the powder in the feed channel 102 into the discharge chute. During the recycling process, although the baffle structure 201 can prevent most of the powder from entering the layered space 101, inevitably, a small amount of fine powder from the upper part of the pusher 200 will still pass through the baffle structure 201 and enter the layered space 101 along with the pusher 200. The pusher 200 is hollow inside, and the upper surface of the hollow part is provided with through holes 202. The powder entering the layered space 101 can enter the internal space of the pusher 200 through the through holes 202, and then enter the external collection bin 400 through the guide pipe 300. The guide pipe 300 can be connected to an air pump to create negative pressure to promote the powder to enter the guide pipe 300. To enable the powder to pass through the through hole 202 quickly, and to prevent the through hole 202 from becoming clogged, while also reducing the power of the air pump, multiple spheres 203 are placed in the layered space 101. The spheres 203 can move freely. As the pusher head 200 moves back and forth, the spheres 203 roll, collide, and rub within the layered space 101. This not only crushes the powder entering the layered space 101 into smaller particles, but also squeezes the through hole 202 to prevent clogging. The fine powder particles after grinding are more likely to pass through the through hole 202 and enter the pusher head 200 under the influence of the air pump or their own weight, and then enter the feed pipe 300 and the external collection bin 400.

[0033] In some embodiments of the present invention, pressure roller devices 204 are installed in the layered space 101 near the two baffle structures 201 (only one pressure roller device 204 is shown in the figure). The pressure roller device 204 includes a connecting rod and a roller. The two ends of the connecting rod are respectively connected to the upper wall of the through channel and the rotating shaft of the roller. The roller and the upper part of the pusher 200 are in rolling connection.

[0034] In this embodiment, the rolling friction roller can always maintain contact with the pusher head 200, while also allowing the pusher head 200 to move. In this way, the pressure roller device 204 can play a certain role in shielding the powder and reducing material return.

[0035] It should be noted that the layered space 101 contains not only calcium carbonate powder, but also low-melting-point viscous compounds generated by impurities at high temperatures. The pressure roller device 204 can flatten these compounds as they enter the layered space 101, facilitating further crushing by the spheres 203. Even if they adhere to the pusher head 200, the pressure rollers repeatedly roll over them during the reciprocating motion of the pusher head 200, providing pressure and friction that will cause them to peel off. Furthermore, if the compounds adhere to the rollers, the impact and friction between the spheres 203 and the rollers will also cause them to peel off. The crushed viscous compounds, after being encapsulated by finer calcium carbonate powder, lose their stickiness, preventing them from adhering to the inner wall of the device or clogging the pipes during subsequent transport.

[0036] In some embodiments of the present invention, the connecting rod is a sleeve structure, including an outer sleeve rod and an inner sleeve rod, wherein the inner sleeve rod passes through a preset axial groove in the outer sleeve rod, and a spring connects the inner sleeve rod and the outer sleeve rod.

[0037] As mentioned earlier, without an elastic sleeve structure, it would be difficult to ensure that the roller of the pressure roller device 204 makes perfect contact with the pusher head 200. Therefore, an elastic sleeve structure is provided. In addition, without an elastic structure, angular gravel may get stuck at the junction of the roller and the pusher head 200. If a large amount accumulates, it will affect the movement of the pusher head 200. Therefore, an elastic structure is provided so that the roller can roll over the gravel, and the gravel will be fully ground and broken by the spheres 203 after entering the layered space 101.

[0038] In some embodiments of the present invention, the through hole 202 is tapered, with the smaller end located on the upper surface of the pusher head 200, and the larger end communicating with the hollow space inside the pusher head 200.

[0039] In this embodiment, to avoid clogging of the through hole 202, it is designed as a tapered hole that is wider at the bottom and narrower at the top, so that larger powder particles can fall down once they enter the through hole 202. Even if particles are blocked at the opening of the through hole 202, they can fall smoothly into the hollow space inside the pusher head 200 under the impact and compression of the ball 203.

[0040] In some embodiments of the present invention, a plurality of support columns are installed in the hollow space inside the pusher head 200.

[0041] In this embodiment, the grinding and collision of the ball 203 require the pusher 200 to have a certain strength. In order to prevent the pusher 200 from being easily deformed due to the hollow structure, multiple support columns are set to improve its mechanical properties.

[0042] In some embodiments of the present invention, the hollow part of the pusher head 200 is located at one end away from the interior of the preheater body 100.

[0043] After the pusher head 200 exits the through channel, its upper part has a material layer of a certain thickness. If this part is provided with a hollow section and a through hole 202, some fine powder may enter the hollow section under this operating condition. To avoid the above situation, the hollow section and the through hole 202 on its upper part are set at a position of the pusher head 200 away from the interior of the preheater body 100, so that after the pusher head 200 is exited, there is no material layer or a small material layer on the upper part of the hollow section and the through hole 202.

[0044] In some embodiments of the present invention, the sphere 203 is made of ceramic or metal alloy, the diameter of the sphere 203 is 1-3 cm, and the volume of the sphere 203 occupies 60-80% of the volume of the layered space 101.

[0045] In this embodiment, only spheres 203 with a diameter of 1-3 cm and occupying 60-80% of the volume of the layered space 101 can have a better grinding effect on the powder entering the layered space 101.

[0046] In some embodiments of the present invention, the thickness of the layered space 101 is 1.1 to 1.3 times the diameter of the sphere 203. This arrangement effectively grinds the powder without significantly hindering the movement of the pusher head 200.

[0047] In some embodiments of the present invention, the external collection bin 400 is connected to the inlet of the dust removal device, and the outlet of the dust removal device is connected to the feed inlet of the preheater body 100.

[0048] In this embodiment, the material collected by the external collection bin 400 is all fine powder. When the collected powder is reused, the transfer of large amounts of material can easily generate dust, which can affect the environment and the lung health of workers. Therefore, the transfer of powder can be carried out by a dust removal device.

[0049] Please refer to Figures 4 to 6 This embodiment provides a dust removal device, including a cylindrical housing 1 and a dust removal and filtration unit 2;

[0050] The bottom of the cylindrical shell 1 is equipped with a material collection bin 11, the side wall of the cylindrical shell 1 is provided with a material inlet, and the dust removal and filtration unit 2 is installed on the top of the cylindrical shell 1;

[0051] The dust removal and filtration unit 2 includes a plate 21 and multiple dust removal components. The plate 21 seals the upper port of the cylindrical housing 1. Multiple through holes are provided on the plate 21, and the multiple dust removal components are respectively installed in the multiple through holes. The dust removal components include a backflush pipe 22, an annular insulating sheet 23, a cylindrical carbon fiber filter layer 24, and a cylindrical conductive fiber filter layer 25. One end of the carbon fiber filter layer 24 is installed on the outer edge of the annular insulating sheet 23, and one end of the conductive fiber filter layer 25 is installed on the inner edge of the annular insulating sheet 23. The ends of the carbon fiber filter layer 24 and the conductive fiber filter layer 25 away from the annular insulating sheet 23 are sealed by a circular insulating sheet 26. The conductive fiber filter layer 25 is grounded through a wire. The backflush pipe 22 passes through the annular insulating sheet 23 and enters the interior of the conductive fiber filter layer 25.

[0052] In this embodiment, considering the corrosiveness of the powder, a fiber material is used as the filter layer, as the fiber material has high corrosion resistance. Furthermore, to prevent dust from clogging the filter pores, this embodiment employs a double-layer filter design (carbon fiber filter layer 24 and conductive fiber filter layer 25) plus a backflushing pipe 22. Specifically, the outer carbon fiber filter layer 24 has high wear resistance and conductivity. During dust removal, the impact and friction between the carbon fiber filter layer 24 and the powder particles generate static electricity in the carbon fiber filter layer 24. Since carbon fiber is a conductive material, it allows the charge to be evenly distributed on the fiber surface, forming an electrostatic field. This electrostatic field can adsorb very fine particles onto the surface of the carbon fiber filter layer 24, increasing its ability to adsorb fine particles. Furthermore, the adsorbed particles maintain their adsorption state through electrostatic force; once the static electricity is lost, the particles detach, along with any sticky particles that may be present due to a small amount of moisture on the outside of the particles. In other words, due to their small weight, the fine particles preferentially adhere to the surface of the carbon fiber filter layer 24, forming a layer of particles that can be removed through conductivity. Removing the particulate layer requires making the carbon fiber filter layer 24 conductive. Therefore, a conductive fiber filter layer 25 is provided inside it, and a backflush pipe 22 is provided inside the conductive fiber filter layer 25. The backflush pipe 22 can blow the elastic conductive fiber filter layer 25 into contact with the carbon fiber filter layer 24. On the one hand, it releases the charge accumulated in the carbon fiber filter layer 24, causing the particulate layer to detach the enriched particles from its exterior. On the other hand, the backflush pipe 22 applies airflow from the inside to the outside, which can also prevent particulate dust from clogging the carbon fiber filter layer 24.

[0053] Of course, to increase corrosion resistance, a corrosion-resistant coating can also be applied to the inner wall of the cylindrical shell 1.

[0054] In some embodiments of the present invention, the carbon fiber filter layer 24 is provided with a plurality of insulating baffles 27 distributed along its axis, the insulating baffles 27 dividing the carbon fiber filter layer 24 into a plurality of non-conductive sub-conductors along the axis, the backflush pipe 22 is connected to an air pump, the bottom of the backflush pipe 22 is sealed, the backflush pipe 22 has a plurality of air outlets distributed in a ring on the side wall near its bottom, and the backflush pipe 22 is connected to a driving device 3, the driving device 3 being used to drive the backflush pipe 22 to move up and down inside the conductive fiber filter layer 25.

[0055] In this embodiment, in order to better accumulate charge, multiple insulating baffles 27 are set to divide the carbon fiber filter layer 24 into multiple mutually insulated sub-conductors. The backflush pipe 22 moves continuously along the axis under the action of the drive device 3, and blows the conductive fiber filter layer 25 and multiple mutually insulated sub-conductors in different parts to contact and discharge in sequence under the action of the air pump, so that each sub-conductor can have enough time to generate charge.

[0056] In this embodiment, the insulating baffle 27 can be a short column, and the carbon fiber material at both ends of the carbon fiber filter layer 24 can be pasted onto the inner and outer walls of the insulating baffle 27 respectively to achieve the insulation function.

[0057] In some embodiments of the present invention, the plate 21 is provided with a plurality of nozzles around the through hole, and the nozzles apply a pulsed airflow along its axis to the carbon fiber filter layer 24 by an air pump with a pulse valve.

[0058] In this embodiment, in order to increase the efficiency of electrostatic accumulation, pulsed gas can be applied along the axis of the carbon fiber filter layer 24. The gas can increase the friction efficiency between air, dust particles and carbon fiber filter layer 24, thereby increasing the speed of electrostatic accumulation. On the other hand, it can also work with the backflush pipe 22 to remove dust from the surface of the carbon fiber filter layer 24.

[0059] In some embodiments of the present invention, the conductive fiber filter layer 25 includes a carbon fiber layer and an ePTFE membrane stacked together, wherein the carbon fiber layer is located on the side close to the carbon fiber filter layer 24.

[0060] In this embodiment, to ensure that the gas blown out by the backflush pipe 22 fully drives the conductive fiber filter layer 25 to contact the carbon fiber filter layer 24, an ePTFE membrane with excellent elasticity can be selected as the main body, and a thin layer of carbon fiber can be disposed on one side thereon. This results in a conductive fiber filter layer 25 that is both elastic and conductive. Alternatively, the ePTFE membrane can be modified to make it conductive; for example, conductive fillers such as carbon nanotubes and carbon black can be added during the preparation of the ePTFE membrane.

[0061] In some embodiments of the present invention, the gas blown out of the air outlet of the backflush pipe 22 is a dry hot gas flow.

[0062] In this embodiment, the dry hot airflow blown out by the backflush pipe 22 can provide aerodynamic force and increase the temperature near the carbon fiber filter layer 24 and the conductive fiber filter layer 25, so that the water vapor entering the dust removal device with the powder will not condense and will eventually be discharged from the device in the form of gas.

[0063] In some embodiments of the present invention, the feed inlet is connected to a pretreatment channel 4, the pretreatment channel 4 is wrapped with a cooling pipe, and cold water circulates in the cooling pipe, the temperature of the cold water being lower than that of the drying hot airflow.

[0064] In this embodiment, the pretreatment channel 4 can cool the gas entering the device, so that it encounters high temperature after entering the device. In this way, water vapor will not condense into liquid, further preventing blockage of carbon fiber filter layer 24.

[0065] In some embodiments of the present invention, a sliding groove is provided at the bottom of the through channel, and a sliding block is included at the bottom of the pusher 200. The sliding groove and the sliding block are matched to define the sliding direction of the pusher 200.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A material recovery device for the pusher head of a lime rotary kiln preheater, characterized in that, The device includes a preheater body (100) and multiple pushers (200). The multiple pushers (200) are respectively installed in multiple through channels opened on the preheater body (100). One end of each through channel is connected to the outside, and the other end is connected to the vertical feed channel (102) of the preheater body (100). One end of each pusher (200) is connected to a hydraulic device (103) installed outside the preheater body (100). A layered space (101) is formed between the upper part of the through channel and the upper part of the pusher (200). A baffle structure (201) is connected to each end of the through channel. The upper part and the sides of the baffle structure (201) are connected to the upper wall and the side edges of the through channel, respectively. The bottom of the two baffle structures (201) is less than 1.5 mm away from the upper part of the pusher (200). Multiple spheres (203) are placed in the layered space (101). The pusher (200) is hollow inside. Multiple through holes (202) with a diameter of less than 1.5 mm are opened on the upper surface of the hollow part of the pusher (200). The through holes (202) connect the inside of the pusher (200) with the layered space (101). The powder brought back by the pusher (200) is broken by the rolling, collision and friction of the ball (203) and enters the pusher (200) through the through holes (202). The hollow space inside the pusher (200) is connected to the external collection bin (400) through the material guide pipe (300) installed on the pusher (200) so that the powder in the hollow part of the pusher (200) is introduced into the external collection bin (400) through the material guide pipe (300) to complete the powder recycling.

2. The lime rotary kiln preheater pusher head material recovery device according to claim 1, characterized in that, A pressure roller device (204) is installed in the layered space (101) near the two baffle structures (201). The pressure roller device (204) includes a connecting rod and a roller. The two ends of the connecting rod are respectively connected to the upper wall of the through channel and the rotating shaft of the roller. The roller and the upper part of the pusher (200) are rolled together.

3. The lime rotary kiln preheater pusher head material recovery device according to claim 2, characterized in that, The connecting rod is a sleeve structure, including an outer sleeve rod and an inner sleeve rod. The inner sleeve rod is inserted into a pre-set axial groove in the outer sleeve rod, and a spring connects the inner sleeve rod and the outer sleeve rod.

4. The lime rotary kiln preheater pusher head material recovery device according to claim 1, characterized in that, The through hole (202) is conical, with the smaller end located on the upper surface of the pusher (200) and the larger end connected to the hollow space inside the pusher (200).

5. The lime rotary kiln preheater pusher head material recovery device according to claim 1, characterized in that, Multiple support columns are installed inside the hollow space of the pusher (200).

6. The lime rotary kiln preheater pusher head material recovery device according to claim 1, characterized in that, The hollow part inside the pusher (200) is located at one end away from the interior of the preheater body (100).

7. The lime rotary kiln preheater pusher head material recovery device according to claim 1, characterized in that, The sphere (203) is made of ceramic or metal alloy, the diameter of the sphere (203) is 1~3cm, and the volume of the sphere (203) accounts for 60~80% of the volume of the layered space (101).

8. The lime rotary kiln preheater pusher head material recovery device according to claim 1, characterized in that, The thickness of the layered space (101) is 1.1 to 1.3 times the diameter of the sphere (203).

9. A lime rotary kiln preheater pusher head material recovery device according to claim 1, characterized in that, The external collection bin (400) is connected to the inlet of the dust removal device, and the outlet of the dust removal device is connected to the feed inlet of the preheater body (100).

10. A lime rotary kiln preheater pusher head material recovery device according to claim 1, characterized in that, A sliding groove is provided at the bottom of the through channel, and a sliding block is installed at the bottom of the pusher (200). The sliding groove and the sliding block are matched to limit the sliding direction of the pusher (200).

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