Vertical drying furnace for drying zinc-containing dust and mud hazardous waste cold agglomerates

Abstract

The utility model belongs to the technical field of vertical drying furnaces, and provides a vertical drying furnace for drying zinc-containing dust and mud hazardous waste cold agglomerates, which comprises a furnace body. The hot air drying mechanism comprises a central exhaust pipe vertically arranged in the furnace chamber, the central exhaust pipe communicates with a plurality of hollow hot air pipes, the tops and the bottoms of the plurality of hollow hot air pipes are arranged close to the top and the bottom of the furnace chamber respectively, and a plurality of exhaust holes are formed in the hollow hot air pipes; the vibrating mechanism comprises two vibrating seats fixedly connected to the furnace body, the two vibrating seats are symmetrically arranged relative to the axis of the furnace body, vibrating assemblies are arranged in the two vibrating seats correspondingly, push rod sets are arranged on the two hollow hot air pipes correspondingly, and the two push rod sets horizontally and slidably penetrate through the furnace body and are symmetrically arranged relative to the axis of the furnace body; the two push rod sets are in transmission connection with the two vibration assemblies respectively. According to the device, the problem that heat transfer is not timely due to the fact that high-temperature tail gas is enriched at the furnace bottom can be solved, and the drying rate of the zinc-containing dust mud hazardous waste cold agglomerates is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of vertical drying furnaces, in particular to a vertical drying furnace for drying zinc-containing dust mud hazardous waste cold blocks. Background Art

[0002] Drying is a key process before cold-bricked zinc-containing dust and hazardous waste enters the rotary hearth furnace for reduction. The drying heat source in this process is usually the high-temperature gas generated during the dezincification process. The quality of cold-brick drying directly affects the reduction reaction in the furnace, and further affects the metallization rate of recovered zinc.

[0003] The industrial drying equipment currently disclosed at home and abroad has a simple internal structure, low high-temperature gas utilization rate, and poor drying effect. High-temperature gas is usually introduced from the bottom of the drying equipment. Due to the stacking of cold blocks at the bottom of the drying equipment, the introduced high-temperature gas is enriched here, and the heat cannot be transferred to the upper zinc-containing dust sludge hazardous waste cold blocks in time. This design cannot efficiently dry a large number of zinc-containing dust sludge hazardous waste cold blocks in the drying equipment, causing the bottom of the drying equipment to become compacted and increasing energy consumption. Therefore, in order to better improve the drying efficiency, it is particularly important to improve the internal structure of the existing drying equipment. Utility Model Content

[0004] The utility model improves and optimizes the traditional zinc-containing dust sludge hazardous waste cold block drying furnace. By arranging a central exhaust duct and a plurality of hollow hot air ducts symmetrically distributed along the circumference of the central exhaust duct in the furnace cavity of the vertical drying furnace, the zinc-containing dust sludge hazardous waste cold blocks are separated, and the cold blocks are dispersed in the space between the furnace wall of the vertical drying furnace and different gas pipelines. The high-temperature exhaust gas discharged from the pipeline wall of each central exhaust duct can simultaneously dry the zinc-containing dust sludge hazardous waste cold blocks in different areas of the furnace, thereby improving the gas utilization rate, improving the problem of untimely heat transfer caused by the high-temperature exhaust gas enrichment at the bottom of the furnace, and improving the drying rate of zinc-containing dust sludge hazardous waste cold blocks.

[0005] To achieve the above purpose, the utility model provides the following solution: a vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold agglomerates, comprising:

[0006] A furnace body, wherein a furnace cavity is arranged in the furnace body;

[0007] A hot air drying mechanism, the hot air drying mechanism comprising a central exhaust duct vertically arranged in the furnace cavity, the central exhaust duct being connected to a plurality of hollow hot air ducts, the plurality of hollow hot air ducts being located in the furnace cavity, and the tops and bottoms of the plurality of hollow hot air ducts being respectively arranged close to the top and bottom of the furnace cavity, and the hollow hot air ducts being provided with a plurality of exhaust holes;

[0008] The vibration mechanism comprises two groups of vibration seats fixedly connected to the furnace body, the two vibration seats are symmetrically arranged relative to the axis of the furnace body, vibration components are respectively arranged in the two groups of vibration seats, and push rod groups are respectively arranged on the two hollow hot air pipes, the two push rod groups slide horizontally through the furnace body, and are symmetrically arranged about the axis of the furnace body, and the two push rod groups are respectively connected to the two vibration components in a transmission manner.

[0009] Preferably, a plurality of the hollow hot air pipes are arranged at equal intervals on the circumferential side wall of the central exhaust pipe, and the hollow hot air pipes are connected to the central exhaust pipe via a plurality of support pipes.

[0010] Preferably, the push rod group includes two groups of push rods, and the two groups of push rods slide horizontally through the furnace wall respectively, one end of the two groups of push rods is fixedly connected to the outer wall of the hollow hot air duct, and the other end of the two groups of push rods is transmission connected to the vibration assembly.

[0011] Preferably, the vibration assembly includes a rotating shaft vertically rotatably connected to the vibration base, both ends of the rotating shaft are coaxially fixedly connected with rotating wheels, the sides of the two groups of rotating wheels are respectively hinged with connecting rods, the connecting rods are arranged away from the rotating shaft, one end of the connecting rod away from the rotating wheel is hinged to one end of the push rod away from the hollow hot air pipe, and a rotating driving member is arranged between the rotating shaft and the vibration base.

[0012] Preferably, a tail gas chamber is provided on the top of the furnace body, a gas outlet is connected to the tail gas chamber, the tail gas chamber is connected to the furnace cavity, and a discharge mechanism is provided at the bottom of the furnace body, the discharge mechanism is connected to the furnace cavity.

[0013] Preferably, the discharging mechanism comprises a discharging port connected to the bottom of the furnace body, the discharging port is connected to the furnace cavity, and a spiral discharging machine is arranged in the discharging port.

[0014] Preferably, the top of the tail gas chamber is connected to a screw feeder, and the top of the central exhaust pipe is fixedly connected to a diverter top seat, the diverter top seat is conical, and the diverter top seat is located below the screw feeder.

[0015] Compared with the prior art, the utility model has the following advantages and technical effects:

[0016] 1. The drying furnace of the utility model can maximize the contact area between the surface of the hollow hot air pipe and the cold blocks by arranging the hollow hot air pipe and the central exhaust pipe, thereby achieving rapid drying.

[0017] 2. The drying furnace of the utility model arranges multiple hollow hot air pipes in the furnace cavity, so that the cold pressed blocks are evenly dispersed in the space between the furnace wall and different hollow hot air pipes. The high-temperature exhaust gas discharged from each hollow hot air pipe can simultaneously dry the zinc-containing dust and sludge hazardous waste cold pressed blocks in different areas of the furnace. Its efficient drying process can reduce the moisture content of the cold pressed blocks to below 0.1%, greatly improving the metallurgical properties of the pressed blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a cross-sectional view of the drying furnace of the utility model;

[0020] Figure 2 It is a schematic diagram of the vibration mechanism of the utility model;

[0021] Figure 3 It is a top view of the central exhaust duct and the hollow hot air duct of the utility model;

[0022] Figure 4 This is a schematic diagram of the distribution of the exhaust holes on the hollow hot air pipe of the utility model;

[0023] Figure 5 The utility model is used to heat zinc-containing dust and sludge hazardous waste to make cold blocks and recycle the tail gas in the zinc extraction process;

[0024] Among them, 1. screw feeder; 2. furnace body; 2-1. air inlet pipe; 2-2. furnace wall; 2-3. furnace cavity; 2-4. central exhaust pipe; 2-5. support pipe; 2-6. hollow hot air pipe; 2-7. exhaust hole; 2-8. tail gas chamber; 2-9. air outlet; 2-10. discharge port; 3. vibration mechanism; 3-1. connecting rod; 3-2. sliding sleeve; 3-3. rotating wheel; 3-4. push rod; 3-5. rotating shaft; 3-6. first gear; 3-7. second gear; 3-8. motor; 3-9. vibration seat; 4. diversion top seat; 5. screw discharger. DETAILED DESCRIPTION

[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] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Reference Figure 1-Figure 5 The utility model provides a vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold blocks, comprising:

[0028] A furnace body 2, wherein a furnace cavity 2-3 is arranged in the furnace body 2;

[0029] The hot air drying mechanism includes a central exhaust duct 2-4 vertically arranged in the furnace cavity 2-3, and the central exhaust duct 2-4 is connected to a plurality of hollow hot air ducts 2-6. The plurality of hollow hot air ducts 2-6 are located in the furnace cavity 2-3, and the tops and bottoms of the plurality of hollow hot air ducts 2-6 are respectively arranged close to the top and bottom of the furnace cavity 2-3, and a plurality of exhaust holes 2-7 are opened on the hollow hot air ducts 2-6;

[0030] The vibration mechanism 3 includes two groups of vibration seats 3-9 fixedly connected to the furnace body 2, the two vibration seats 3-9 are symmetrically arranged relative to the axis of the furnace body 2, and vibration components are respectively arranged in the two groups of vibration seats 3-9. Push rod groups are respectively arranged on the two hollow hot air pipes 2-6. The two push rod groups slide horizontally through the furnace body 2 and are symmetrically arranged about the axis of the furnace body 2. The two push rod groups are respectively connected to the two vibration components in a transmission manner.

[0031] The main function of the central exhaust duct 2-4 is to introduce high-temperature tail gas into the plurality of hollow hot air ducts 2-6; the main function of the plurality of hollow hot air ducts 2-6 is to disperse the cold-cast blocks in the space between the furnace chamber 2-3 and the hollow hot air ducts 2-6, and at the same time, spray the high-temperature tail gas to the cold-cast blocks at different heights through the plurality of exhaust holes 2-7, so that the cold-cast blocks in different areas can be dried at the same time; the main function of the vibration component is to drive the plurality of hollow hot air ducts 2-6 to vibrate horizontally, so that the cold-cast blocks are evenly dispersed in the furnace chamber 2-3 during the feeding process, thereby ensuring the drying effect. On the whole, the utility model increases the contact area between the cold-cast blocks and the high-temperature tail gas to the greatest extent by setting a plurality of hollow hot air ducts, and at the same time, the cold-cast blocks in different height areas in the furnace chamber can be dried at the same time under the action of the high-temperature tail gas, thereby avoiding the high-temperature tail gas from enriching the furnace body, improving the gas utilization rate, and at the same time improving the drying efficiency and drying effect.

[0032] To further optimize the solution, a plurality of hollow hot air ducts 2-6 are arranged at equal intervals on the circumferential side wall of the central exhaust duct 2-4, and the hollow hot air duct 2-6 is connected to the central exhaust duct 2-4 through a plurality of support tubes 2-5.

[0033] like Figure 1 and Figure 3 As shown, a central hot air pipe 2-4 is provided and is located on the axis of the furnace chamber 2-3. The angle α between two adjacent hollow hot air pipes 2-6 is set at 0° to 60°, so that the number of hollow hot air pipes 2-6 is greater than or equal to 6, and a plurality of hollow hot air pipes 2-6 are distributed in the furnace chamber 2-3 around the central exhaust pipe 2-4. The number of support pipes 2-5 between each hollow hot air pipe 2-6 and the central exhaust pipe 2-4 is not less than 4, and the high-temperature exhaust gas in the central exhaust pipe 2-4 enters the hollow hot air pipe 2-6 through a plurality of support pipes 2-5.

[0034] The hollow hot air pipe 2-6 is a long sheet-shaped columnar pipe. The central hot air pipe 2-4 and the hollow hot air pipe 2-6 extend from the bottom of the drying furnace to the surface of the cold block material layer. The length of the hollow hot air pipe 2-6 along the radial direction of the furnace cavity 2-3 is 0.5-0.8 times the radius of the furnace cavity 2-3, which can maximize the contact area between its surface and the cold block.

[0035] Further optimizing the scheme, the bottom of the central exhaust pipe 2-4 is connected to one end of the intake pipe 2-1, and the other end of the intake pipe 2-1 is connected to the outlet of the condenser that produces high-temperature exhaust gas. The intake pipe 2-1 is a metal hose, which can avoid interference with the vibration of the central exhaust pipe 2-4.

[0036] To further optimize the solution, the push rod group includes two groups of push rods 3-4, and the two groups of push rods 3-4 slide horizontally through the furnace wall 2-2 respectively, one end of the two groups of push rods 3-4 is fixedly connected to the outer wall of the hollow hot air pipe 2-6, and the other end of the two groups of push rods 3-4 is transmission-connected to the vibration assembly.

[0037] According to a further optimized solution, a sliding sleeve 3-2 is provided on the push rod 3-4, and the sliding sleeve 3-2 is fixedly embedded in the furnace wall 2-2.

[0038] like Figure 2 As shown, the central exhaust pipe 2-4 and the plurality of hollow hot air pipes 2-6 are slidably connected in the furnace chamber 2-3 through four sets of push rods 3-4. The sliding sleeve 3-2 can prevent the push rods 3-4 from directly contacting the furnace wall 2-2 and causing wear to the furnace wall 2-2.

[0039] A further optimized solution is that the vibration assembly includes a rotating shaft 3-5 vertically rotatably connected in the vibration seat 3-9, both ends of the rotating shaft 3-5 are coaxially fixedly connected with wheels 3-3, the sides of the two groups of wheels 3-3 are respectively hinged with connecting rods 3-1, the connecting rod 3-1 is arranged away from the rotating shaft 3-5, one end of the connecting rod 3-1 away from the wheel 3-3 is hinged to one end of the push rod 3-4 away from the hollow hot air pipe 2-6, and a rotating drive member is arranged between the rotating shaft 3-5 and the vibration seat 3-9.

[0040] Further optimized solution, the rotating drive member includes a first gear 3-6 fixedly sleeved on the rotating shaft 3-5 and a motor 3-8 fixedly connected to the vibration seat 3-9, and a second gear 3-7 is fixedly sleeved on the output shaft of the motor 3-8, and the second gear 3-7 is meshed with the first gear 3-6. The motor 3-8 is electrically connected to the electric control system of the drying furnace.

[0041] like Figure 1 and Figure 2 As shown, during the feeding process, the motor 3-8 is controlled to rotate by the electric control system of the drying furnace. The rotation of the motor 3-8 drives the rotating shaft 3-5 to rotate through the second gear 3-7 and the first gear 3-6. The rotation of the rotating shaft 3-5 drives the rotating wheels 3-3 at both ends to rotate. When the rotating wheel 3-3 rotates, it drives the connecting rod 3-1 hinged thereon to generate a reciprocating force on the push rod 3-4, and drives the push rod 3-4 to vibrate in the horizontal direction, thereby driving the hollow hot air pipe 2-6 directly connected to it to vibrate, and then drives several hollow hot air pipes 2-6 and the central exhaust pipe 2-4 to vibrate in the furnace cavity 2-3 at the same time, so that the cold blocks are evenly dispersed in the furnace cavity 2-3.

[0042] According to a further optimization scheme, a tail gas chamber 2-8 is provided on the top of the furnace body 2, an air outlet 2-9 is connected to the tail gas chamber 2-8, the tail gas chamber 2-8 is connected to the furnace cavity 2-3, and a discharge mechanism is provided at the bottom of the furnace body 2, the discharge mechanism is connected to the furnace cavity 2-3.

[0043] According to a further optimized solution, the discharging mechanism includes a discharging port 2-10 connected to the bottom of the furnace body 2, the discharging port 2-10 is connected to the furnace cavity 2-3, and a spiral discharging machine 5 is arranged in the discharging port 2-10.

[0044] like Figure 1 As shown, the screw discharging machine 5 is electrically connected to the electric control system of the drying furnace. After drying, the water vapor and the dust falling off the cold blocks can be enriched in the tail gas chamber 2-8 on the upper layer of the furnace along with the tail gas of the drying furnace, and no additional air pump is required, and they are discharged from the outlet 2-9 for the next step of processing. The dried dry material balls can be discharged from the furnace cavity 2-3 by controlling the operation of the screw discharging machine 5 through the electric control system.

[0045] According to a further optimization scheme, the top of the tail gas chamber 2-8 is connected to a screw feeder 1, and the top of the central exhaust pipe 2-4 is fixedly connected to a diverter top seat 4, which is conical and located below the screw feeder 1.

[0046] like Figure 1 As shown, during the process of the screw feeder 1 feeding a large number of cold-cast blocks into the furnace chamber 2-3, the diverter top seat 4 can guide the cold-cast blocks uniformly to the surroundings, so that the cold-cast blocks in the furnace chamber 2-3 are evenly distributed.

[0047] The screw feeder 1 and the screw discharging machine 5 are prior art, and their working principles and working processes are not described in detail.

[0048] The working process of this embodiment is as follows:

[0049] like Figure 5 As shown, in this embodiment, the air inlet pipe 2-1 is connected to the air outlet of the new condenser; the air outlet 2-9 is connected to the bag filter. The zinc extraction process of using the drying furnace of this embodiment to heat zinc-containing dust and sludge hazardous waste and cold agglomerate and recycle tail gas is as follows:

[0050] The zinc-containing dust and sludge hazardous waste cold blocks are fed into the furnace chamber 2-3 by the screw feeder 1. At the same time, the motor 3-8 is controlled to rotate by the electronic control system to drive several hollow hot air pipes 2-6 to vibrate, so that the cold blocks are evenly dispersed in the space between the furnace wall 2-3 and the central exhaust pipe 2-4 and the hollow hot air pipe 2-6. The filling height of the cold blocks does not exceed the top of the hollow hot air pipe 2-6. The dezincified high-temperature tail gas with a temperature of not less than 400°C discharged from the outlet of the new condenser enters the central exhaust pipe 2-4 through the air inlet pipe 2-1, and then disperses the concentrated high-temperature tail gas from bottom to top to each connected hollow hot air pipe 2-6 through the support pipe 2-5. The high-temperature tail gas is discharged from the exhaust hole 2-7 on the wall of the hollow hot air pipe 2-6 to dry the cold blocks in the opposite furnace chamber 2-3. During the drying process, the motor 3-8 can be started to vibrate the cold blocks in the furnace chamber 2-3 to accelerate the circulation of the high-temperature tail gas in the cold blocks. After drying, water vapor and dust shed from the briquetting are enriched in the tail gas chamber 2-8 on the upper layer of the furnace along with the tail gas of the drying furnace. No additional air pump is required, and the tail gas is discharged from the outlet 2-9 and sent to the bag filter. The tail gas of the 100℃ vertical drying furnace is dedusted and dehumidified by the bag filter and the dehydration device to become 40℃ low-temperature tail gas, and then passed into the dezincification reactor to react with zinc-containing dust and hazardous waste dry material balls to obtain 1000℃ high-temperature zinc-containing flue gas, and finally condensed and dezincified in the new condenser. The discharged 400℃ dezincified high-temperature tail gas can be used as a drying source and passed into the air intake pipe 2-1 again.

[0051] The drying furnace of the utility model can build an efficient closed-loop system by recycling the drying furnace tail gas and heat generated in the reaction process, thereby achieving ultra-low emissions and high heat utilization rate.

[0052] In the description of the present invention, it should be understood that the terms "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 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.

[0053] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold agglomerates, characterized in that: include: A furnace body (2), wherein a furnace cavity (2-3) is arranged in the furnace body (2); A hot air drying mechanism, the hot air drying mechanism comprising a central exhaust duct (2-4) vertically arranged in the furnace cavity (2-3), the central exhaust duct (2-4) being connected to a plurality of hollow hot air ducts (2-6), the plurality of hollow hot air ducts (2-6) being located in the furnace cavity (2-3), and the tops and bottoms of the plurality of hollow hot air ducts (2-6) being respectively arranged close to the top and bottom of the furnace cavity (2-3), and the hollow hot air ducts (2-6) being provided with a plurality of exhaust holes (2-7); A vibration mechanism (3), the vibration mechanism (3) comprising two groups of vibration seats (3-9) fixedly connected to the furnace body (2), the two vibration seats (3-9) being symmetrically arranged relative to the axis of the furnace body (2), the two groups of vibration seats (3-9) being respectively provided with vibration components, the two hollow hot air pipes (2-6) being respectively provided with push rod groups, the two push rod groups slidingly passing through the furnace body (2) horizontally, and being symmetrically arranged relative to the axis of the furnace body (2), the two push rod groups being respectively connected to the two vibration components in a transmission manner.

2. A vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold agglomeration according to claim 1, characterized in that: A plurality of the hollow hot air pipes (2-6) are arranged at equal intervals on the circumferential side wall of the central exhaust pipe (2-4), and the hollow hot air pipes (2-6) are connected to the central exhaust pipe (2-4) via a plurality of support pipes (2-5).

3. A vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold agglomerates according to claim 1, characterized in that: The push rod group comprises two groups of push rods (3-4), the two groups of push rods (3-4) respectively slide horizontally through the furnace wall (2-2), one end of the two groups of push rods (3-4) is fixedly connected to the outer wall of the hollow hot air pipe (2-6), and the other end of the two groups of push rods (3-4) is transmission-connected to the vibration component.

4. A vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold briquetting according to claim 3, characterized in that: The vibration assembly comprises a rotating shaft (3-5) vertically rotatably connected to the vibration seat (3-9), the two ends of the rotating shaft (3-5) are respectively coaxially fixedly connected with rotating wheels (3-3), the sides of the two groups of rotating wheels (3-3) are respectively hinged with connecting rods (3-1), the connecting rods (3-1) are arranged away from the rotating shaft (3-5), one end of the connecting rod (3-1) away from the rotating wheel (3-3) is hinged to one end of the push rod (3-4) away from the hollow hot air pipe (2-6), and a rotating driving member is arranged between the rotating shaft (3-5) and the vibration seat (3-9).

5. A vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold briquetting according to claim 1, characterized in that: The top of the furnace body (2) is provided with an exhaust chamber (2-8), the exhaust chamber (2-8) is connected to an outlet (2-9), the exhaust chamber (2-8) is connected to the furnace cavity (2-3), and the bottom of the furnace body (2) is provided with a discharge mechanism, the discharge mechanism is connected to the furnace cavity (2-3).

6. A vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold briquetting according to claim 5, characterized in that: The discharge mechanism comprises a discharge port (2-10) connected to the bottom of the furnace body (2), the discharge port (2-10) is connected to the furnace cavity (2-3), and a spiral discharge machine (5) is arranged in the discharge port (2-10).

7. A vertical drying furnace for drying zinc-containing dust and sludge hazardous waste cold briquetting according to claim 5, characterized in that: The top of the tail gas chamber (2-8) is connected to a screw feeder (1), and the top of the central exhaust pipe (2-4) is fixedly connected to a diversion top seat (4), the diversion top seat (4) is conical, and the diversion top seat (4) is located below the screw feeder (1).

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