Construction waste crushing device

Abstract

The invention provides a construction waste crushing device. The construction waste crushing device comprises a cavity, a crushing unit, a magnetic filter screen, a dust suction mechanism, a pushing mechanism and a collecting mechanism; the crushing unit is arranged in the cavity, the magnetic filter screen is fixedly arranged in the cavity, and the dust collection mechanism is arranged in the cavity in a penetrating mode and faces the magnetic filter screen; the collecting mechanism is rotatably arranged in the cavity and is provided with an opening; the pushing mechanism is telescopically arranged in the cavity, and when the pushing mechanism extends, the collecting mechanism can rotate and open the opening of the collecting mechanism, and waste on the magnetic filter screen is pushed into the collecting mechanism at the same time. According to the construction waste crushing device, metal scraps can be prevented from being sucked in together, so that the wastewater treatment steps are reduced, and meanwhile, the utilization rate of waste materials can be further increased.

Description

Technical Field

[0001] This invention relates to the field of construction technology, and more specifically to a construction waste crushing device. Background Technology

[0002] Crushing is a core pre-process for the resource utilization of construction waste. Crushing equipment breaks down blocky construction waste such as waste concrete, bricks, and stone into specified particle sizes before it can be used in the production of recycled aggregates, recycled bricks, roadbed fillers, and other resource-based products. However, the high-speed impact and crushing process generates a large amount of extremely fine dust. If not properly controlled, this dust can severely pollute the air at the work site, harm the health of workers, and fail to meet relevant environmental protection construction standards.

[0003] To address the aforementioned dust pollution problem, the commonly used solution in existing technologies is to install dust collection systems at dust emission points such as the crushing chamber and discharge port of the crushing device. These systems use negative pressure suction to collect the dust generated during operation and transport it to a dust removal device for purification, thereby achieving effective dust control. However, in practical engineering applications, this type of technical solution has significant technical shortcomings.

[0004] Construction waste materials commonly contain scrap steel bars, wires, embedded hardware, metal pipes, and other metal components. Even after preliminary iron removal pretreatment before crushing, a large number of small metal parts and those embedded in the concrete cannot be completely separated. During the crushing process, these components are crushed along with the construction waste, forming a large amount of fine metal shavings. Existing dust collection systems cannot distinguish between dust and metal shavings during dust extraction, and will suck metal shavings of similar particle size into the dust collection system along with the dust, causing the metal shavings and dust to mix during the dust removal process.

[0005] On the one hand, metal scrap is a high-value recyclable resource. However, metal scrap mixed in with dust cannot be directly recycled. To purify and recycle metal scrap, multiple separation processes such as screening, magnetic separation, and gravity separation are required. This not only significantly increases the equipment investment, labor costs, and energy consumption for construction waste treatment but also lengthens the resource recovery process and reduces the efficiency of metal resource recycling. On the other hand, metal scrap with high hardness will continuously scour and wear down the inner wall of the dust collection pipe after entering the dust collection pipe and dust removal equipment with the high-speed airflow. It may even puncture the filter bags of the bag filter and damage the fan impeller, significantly shortening the service life of the dust removal system and increasing the frequency of equipment maintenance and operating costs.

[0006] Currently, existing technologies for improving this problem mainly focus on the pre-iron removal stage before crushing, or adding a metal separation process at the end of the dust removal system. The former cannot completely solve the problem of newly generated metal scraps mixed with dust during the crushing process, while the latter fails to reduce the damage of metal scraps to dust removal equipment at the source, nor can it simplify the metal recovery process. A mature technical solution has not yet been formed that can simultaneously achieve efficient separation of dust and metal scraps in the dust extraction stage, balance dust removal effect and metal resource recovery, and reduce equipment wear. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention proposes a construction waste crushing device to solve the technical problem mentioned in the background art where metal scraps are sucked into the dust collection mechanism along with the dust during the construction waste crushing process.

[0008] To solve this technical problem, the technical solution adopted by the present invention is as follows: A construction waste crushing device includes a cavity, a crushing unit, a magnetic filter, a dust collection mechanism, a material pushing mechanism, and a collection mechanism; The pulverizing unit is disposed in the cavity, the magnetic filter is fixed in the cavity, and the dust collection mechanism passes through the cavity and faces the magnetic filter; The collection mechanism is rotatably disposed within the cavity and has an opening; the pushing mechanism is telescopically disposed within the cavity, and when the pushing mechanism extends, it enables the collection mechanism to rotate and open its opening, while simultaneously pushing the waste material on the magnetic filter screen into the collection mechanism.

[0009] Furthermore, a baffle mechanism is provided, which is located between the feed inlet of the cavity and the crushing unit. After the baffle mechanism closes the feed, the pushing mechanism will extend.

[0010] Furthermore, the baffle mechanism includes a baffle assembly, a drive assembly, and a drive plate; two sets of baffle assemblies are arranged opposite each other and rotatably pass through the cavity, and the two baffle assemblies can prevent material from entering the crushing unit by rotation; the drive assembly is disposed on the cavity and can drive the baffle assembly to rotate; the drive plate is disposed on the baffle assembly, and the drive plate can extend the pushing mechanism after rotating with the baffle assembly.

[0011] Furthermore, the baffle assembly includes a baffle body, a baffle shaft, and a baffle gear; the baffle shaft is rotatably mounted on the cavity, the baffle body is located inside the cavity and fixed on the baffle shaft, the baffle gear is coaxially fixed on the baffle shaft, the two baffle gears mesh with each other, and the drive assembly can drive the baffle gear to rotate; the drive plate is fixed on one of the baffle shafts and can extend and retract the pushing mechanism.

[0012] Furthermore, the drive assembly includes a drive motor and a drive gear; the drive motor is disposed on the cavity, and the drive gear is coaxially fixed on the output shaft of the drive motor and meshes with a baffle gear.

[0013] Furthermore, the feeding mechanism includes a first electric telescopic rod, a first feeding plate, and a connecting rope; the first electric telescopic rod is disposed on the cavity, the first feeding plate is fixed to the telescopic end of the first electric telescopic rod and closely attached to the magnetic filter on the side facing the crushing unit; one end of the connecting rope is connected to the telescopic end of the first electric telescopic rod, and the other end is connected to the collecting mechanism, and the extension of the first electric telescopic rod can drive the collecting mechanism to rotate through the connecting rope.

[0014] Furthermore, the collection mechanism includes a collection shaft, a collection box, and a torsion spring; the collection shaft is rotatably disposed within the cavity, the collection box is fixed on the collection shaft and connected to the cavity via the torsion spring, one end of the connecting rope is connected to the collection box, and the other end is connected to the telescopic end of the first electric telescopic rod.

[0015] Furthermore, the vacuuming mechanism includes a water tank, a first air pump, a vacuum pipe, and a vacuum hood; the water tank is located on the cavity and is connected to the vacuum pipe via the first air pump; the vacuum hood is located at the end of the vacuum pipe and faces the magnetic filter.

[0016] Furthermore, the magnetic filter screen is provided in multiple sets, with the pore size decreasing and the magnetism increasing sequentially from top to bottom.

[0017] Furthermore, a guide pipe, a second air pump, a second electric telescopic rod, and a second pusher plate are also provided; the guide pipe faces the uppermost magnetic filter screen, one end of the guide pipe passes through the cavity, and the other end is connected to the second air pump, which is located on the top surface of the cavity; the second electric telescopic rod is located on the cavity, and the second pusher plate is fixed to the telescopic end of the second electric telescopic rod, which can push the metal waste adsorbed by the uppermost magnetic filter screen into the guide pipe.

[0018] The advancements of this application compared to existing technologies are as follows: Existing technologies, such as those shown in CN221155909U, involve a dust collection structure operating simultaneously during the crushing of construction waste. This results in dust and metal scrap being sucked in together, necessitating an additional purification process for the metal scrap, thus increasing energy consumption and reducing efficiency. In contrast, in this application, the dust collection port of the dust collection mechanism is positioned below a magnetic filter. The resulting negative pressure causes the dust and metal scrap to move towards the magnetic filter. The metal scrap is adsorbed onto the magnetic filter, while the dust is absorbed by the dust collection mechanism, thereby separating the metal scrap and dust and improving the purification efficiency of the metal scrap. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 This is a schematic diagram of a construction waste crushing device according to an embodiment of the present invention; Figure 2 for Figure 1 The diagram shows a cross-sectional view of a construction waste crushing device. Figure 3 for Figure 1 A cross-sectional schematic diagram of a construction waste crushing device from another angle is shown; Figure 4 A schematic diagram of the collection agency; Figure 5 This is a schematic diagram of the feeding mechanism and the magnetic filter.

[0021] Figure label: 1. Cavity; 2. Crushing unit; 3. Magnetic filter; 4. Dust collection mechanism; 4. Water tank; 41. First air pump; 42. Dust collection pipe; 43. Dust collection hood; 44. Driven gear ring; 45. Driven rack; 46. Pushing mechanism; 5. First electric telescopic rod; 51. Touch switch; 511. First push plate; 52. Connecting rope; 53. Collection mechanism; 6. Collection shaft; 61. Collection box; 62. Torsion spring; 63. Baffle mechanism; 7. Baffle assembly; 71. Baffle body; 711. Baffle shaft; 712. Baffle gear; 713. Drive assembly; 721. Drive motor; 722. Drive gear; 73. Drive plate; 81. Guide pipe; 82. Second air pump; 83. Second electric telescopic rod; 84. Second push plate. Detailed Implementation

[0022] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0023] Please refer to the following: Figures 1-5This embodiment provides a construction waste crushing device, including a cavity 1, a crushing unit 2, a magnetic filter 3, a dust collection mechanism 4, a material pushing mechanism 5, and a collection mechanism 6; The crushing unit 2 is located inside the cavity 1, the magnetic filter 3 is fixed inside the cavity 1, and the dust collection mechanism 4 is installed inside the cavity 1 and faces the magnetic filter 3. Preferably, a downward-sloping baffle is provided between the magnetic filter and the crushing unit 2, so that the crushed waste can flow to the magnetic filter 3. The magnetic filter 3 allows dust to pass through while leaving metal scraps. The magnetic filter 3 is preferably inverted V-shaped to facilitate the waste to flow out from both sides. The negative pressure port of the dust collection mechanism 4 inside the cavity 1 faces the bottom of the magnetic filter 3 to facilitate the suction of dust.

[0024] The collecting mechanism 6 is rotatably disposed within the cavity 1 and has an opening; the pushing mechanism 5 is telescopically disposed within the cavity 1. When the pushing mechanism 5 extends, it enables the collecting mechanism 6 to rotate and open its opening, simultaneously pushing the waste material on the magnetic filter 3 into the collecting mechanism 6. Specifically, a boss is provided within the cavity 1, and the collecting mechanism 6 is rotatably disposed within this boss. When the pushing mechanism 5 is not extended, the opening of the collecting mechanism 6 is concealed within the boss. Preferably, the boss has a closable opening for collecting metal waste within the collecting mechanism 6.

[0025] In this application, the waste pulverized by the pulverizing unit 2 flows to the magnetic filter 3, where the magnetic filter 3 adsorbs and traps metal scraps and debris. The dust collection mechanism 4 below the magnetic filter 3 generates negative pressure, allowing dust to pass through the metal filter and be absorbed. After a period of time, the pushing mechanism 5 is activated, extending to open the opening of the collection mechanism 6, pushing the metal objects on the magnetic filter 3 into the collection mechanism 6. This prevents metal scraps from being sucked in during the dust collection process, thus reducing the number of wastewater treatment steps and further improving the utilization rate of waste materials.

[0026] In other designs, a baffle mechanism 7 is also provided. The baffle mechanism 7 is located between the feed inlet of the cavity 1 and the crushing unit 2. After the baffle mechanism 7 closes the feed, the pushing mechanism 5 extends. That is, the baffle mechanism 7 can prevent the material from falling and being crushed by the crushing mechanism. The pushing action is performed only after the baffle mechanism 7 prevents the material from falling, thus avoiding new material being pushed onto the magnetic filter screen 3 and preventing the crushed waste from accumulating on the other side of the pushing mechanism 5.

[0027] In other embodiments, the baffle mechanism 7 includes a baffle assembly 71, a drive assembly 72, and a drive plate 73. Two sets of baffle assemblies 71 are arranged opposite each other and rotatably pass through the cavity 1. The two baffle assemblies 71 can prevent material from entering the crushing unit 2 by rotation. The drive assembly 72 is located on the cavity 1 and can drive the baffle assembly 71 to rotate. The drive plate 73 is located on the baffle assembly 71, and after the drive plate 73 rotates with the baffle assembly 71, it can extend the pushing mechanism 5. Specifically, after the baffle assembly 71 rotates to prevent material from falling, the drive plate 73 extends the pushing mechanism 5, and then the pushing mechanism 5 resets. The drive assembly 72 can maintain the angular position of the baffle assembly 71, so that the baffle assembly 71 will not deflect due to the gravity of the material. The drive assembly 72 is driven intermittently, and its start-up time can be determined by parameters such as the size of the magnetic filter 3.

[0028] In other embodiments, the baffle assembly 71 includes a baffle body 711, a baffle shaft 712, and a baffle gear 713. The baffle shaft 712 is rotatably mounted on the cavity 1. The baffle body 711 is located inside the cavity 1 and fixed to the baffle shaft 712. The baffle gear 713 is coaxially fixed to the baffle shaft 712, and the two baffle gears 713 mesh with each other. The drive assembly 72 can drive the baffle gear 713 to rotate. The drive plate 73 is fixed to one of the baffle shafts 712 and can extend and retract the pushing mechanism 5. Specifically, the baffle body 711 is initially in a vertical state. After the drive assembly 72 is started, the two baffle bodies 711 rotate to a horizontal state, separating the space above the crushing unit 2.

[0029] In other embodiments, the drive assembly 72 includes a drive motor 721 and a drive gear 722. The drive motor 721 is mounted on the cavity 1, and the drive gear 722 is coaxially fixed on the output shaft of the drive motor 721 and meshes with a baffle gear 713. Specifically, the drive motor 721 is connected to the cavity 1 via a fixed plate. The drive motor 721 is periodically started to periodically push the magnetic filter screen 3, and the drive motor 721 can hold its output shaft closed when stopped to prevent it from rotating.

[0030] In other embodiments, the feeding mechanism 5 includes a first electric telescopic rod 51, a first feeding plate 52, and a connecting rope 53. The first electric telescopic rod 51 is mounted on the cavity 1, and the first feeding plate 52 is fixed to the telescopic end of the first electric telescopic rod 51 and closely adheres to the magnetic filter 3 on the side facing the crushing unit 2. One end of the connecting rope 53 is connected to the telescopic end of the first electric telescopic rod 51, and the other end is connected to the collecting mechanism 6. The extension of the first electric telescopic rod 51 can drive the collecting mechanism 6 to rotate through the connecting rope 53. Specifically, when the first electric telescopic rod 51 extends, it causes the collecting mechanism 6 to rotate toward the magnetic filter 3, allowing the metal material on the magnetic filter 3 to enter it; when the first electric telescopic rod 51 shortens, the collecting mechanism 6 returns to its original position. Preferably, several guide wheels are also fixed on the inner wall of the cavity 1, and the connecting rope 53 passes through the guide wheels and connects to the collecting mechanism 6, thereby making the sliding of the connecting rope 53 smoother. The switch for the first electric telescopic rod 51 is a tactile switch 511. Each press causes the first electric telescopic rod 51 to extend or retract once. The tactile switch 511 is specifically located on the cavity 1 and is periodically pressed by the drive plate 73.

[0031] In other embodiments, the collection mechanism 6 includes a collection shaft 61, a collection box 62, and a torsion spring 63. The collection shaft 61 is rotatably mounted inside the cavity 1. The collection box 62 is fixed to the collection shaft 61 and connected to the cavity 1 via the torsion spring 63. One end of the connecting rope 53 is connected to the collection box 62, and the other end is connected to the telescopic end of the first electric telescopic rod 51. Specifically, the collection box 62 is located inside a protrusion within the cavity 1. In the initial state, the opening of the collection box 62 is hidden inside the protrusion, and after rotation, the opening faces the magnetic filter 3. Preferably, the collection box 62 is also provided with a protective shell to protect the connecting rope 53 from damage by falling waste.

[0032] In other embodiments, the vacuuming mechanism 4 includes a water tank 41, a first air pump 42, a vacuum pipe 43, and a vacuum hood 44. The water tank 41 is located on the cavity 1 and is connected to the vacuum pipe 43 via the first air pump 42. The vacuum hood 44 is located at the end of the vacuum pipe 43 and faces the magnetic filter 3. It should be understood that the first air pump 42 generates negative pressure to draw dust into the water tank 41 for settling, thereby reducing the harm to the operator from dust spillage. Specifically, the vacuum pipe 43 is divided into two parts: one part is connected to the first air pump 42 and is non-rotatable, while the other part is connected to the first air pump 42 and rotatably passes through the cavity 1.

[0033] Furthermore, the suction pipe 43 is rotatably mounted on the cavity 1, and a driven gear ring 45 is coaxially fixed on the suction pipe 43. A driven rack 46 is also slidably connected to the cavity 1, and one end of the driven rack 46 is connected to the telescopic end of the first electric telescopic rod 51 via a connecting rope 53. The other end of the driven rack 46 is connected to the collection box 62 via a connecting rope 53. The driven rack 46 and the driven gear ring 45 are connected. Thus, the lifting and lowering of the driven rack 46 corresponds to the extension and retraction of the first electric telescopic rod 51. Furthermore, when the first electric telescopic rod 51 extends, the sliding of the driven rack 46 drives the suction pipe 43 to rotate through the driven gear ring 45, causing the dust collection hood 44 to rotate downward. Through this mechanism, when cleaning metal debris on the magnetic filter 3, the suction direction is changed, preventing the pushed-down debris from being sucked into the dust collection hood 44, thereby further avoiding subsequent wastewater treatment. Preferably, the pushing mechanism 5 extends to rotate the suction pipe 43 by 180°.

[0034] In other designs, the magnetic filter 3 is composed of multiple sets, with the pore size decreasing and the magnetism increasing sequentially from top to bottom. After construction waste is crushed, metal objects are often encased in sand and gravel aggregates. A single-layer magnetic filter 3 easily adsorbs the metal objects encased in sand and gravel aggregates, resulting in impure metal waste collected later, increasing the need for subsequent material selection and purification processes. By setting up multiple layers of magnetic filters 3, the upper magnetic filter 3 with stronger magnetism captures the sand and gravel aggregates encasing metal objects, while the lower magnetic filter 3 with weaker magnetism captures relatively pure metal waste, thus achieving pre-selection and making the collected metal waste purer. Preferably, the magnetic filter 3 is an electromagnet, and the magnetic force of each magnetic filter 3 can be adjusted by changing the energizing current through an individual switch to adapt to different working scenarios. Furthermore, demagnetization and magnetization can be achieved by turning the power on and off, facilitating subsequent collection and cleaning.

[0035] In other designs, a guide pipe 81, a second air pump 82, a second electric telescopic rod 83, and a second pusher plate 84 are also included. The guide pipe 81 faces the uppermost magnetic filter 3, with one end of the guide pipe 81 passing through the cavity 1 and the other end connected to the second air pump 82, which is located on the top surface of the cavity 1. The second electric telescopic rod 83 is located on the cavity 1, and the second pusher plate 84 is fixed to the telescopic end of the second electric telescopic rod 83. The second pusher plate 84 can push the metal waste adsorbed by the uppermost magnetic filter 3 into the guide pipe 81. Specifically, after the uppermost metal waste is pushed into the guide pipe 81, the second air pump 82 generates negative pressure to suck the metal waste in the guide pipe 81 to the top of the crushing unit 2 for further crushing. Thus, after multiple crushings, the sand and gravel aggregate containing the metal waste is discharged from the magnetic filter 3, and the metal waste is collected on the lower magnetic filter 3. This results in purer collected metal scraps, eliminating the need for subsequent filtration and material selection processes. Furthermore, the device itself has a crushing process, so there is no need to crush the collected waste again, making it more energy-efficient.

[0036] The aforementioned construction waste crushing device can prevent metal scraps from being sucked in along with the waste, thereby reducing the number of wastewater treatment steps and further improving the utilization rate of waste materials.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A construction waste crushing device, characterized in that, It includes a cavity, a crushing unit, a magnetic filter, a dust collection mechanism, a material pushing mechanism, and a collection mechanism; The pulverizing unit is disposed in the cavity, the magnetic filter is fixed in the cavity, and the dust collection mechanism passes through the cavity and faces the magnetic filter; The collection mechanism is rotatably disposed within the cavity and has an opening; the pushing mechanism is telescopically disposed within the cavity, and when the pushing mechanism extends, it enables the collection mechanism to rotate and open its opening, while simultaneously pushing the waste material on the magnetic filter screen into the collection mechanism.

2. The construction waste crushing device according to claim 1, characterized in that, A baffle mechanism is also provided, which is located between the feed inlet of the cavity and the crushing unit. After the baffle mechanism closes the feed, the pushing mechanism will extend.

3. The construction waste crushing device according to claim 2, characterized in that, The baffle mechanism includes a baffle assembly, a drive assembly, and a drive plate; two sets of baffle assemblies are arranged opposite each other and rotatably pass through the cavity, and the two baffle assemblies can prevent materials from entering the crushing unit by rotating; the drive assembly is located on the cavity and can drive the baffle assembly to rotate; the drive plate is located on the baffle assembly, and the drive plate can extend the pushing mechanism after rotating with the baffle assembly.

4. A construction waste crushing device according to claim 3, characterized in that, The baffle assembly includes a baffle body, a baffle shaft, and a baffle gear; the baffle shaft is rotatably mounted on the cavity, the baffle body is located in the cavity and fixed on the baffle shaft, the baffle gear is coaxially fixed on the baffle shaft, the two baffle gears mesh with each other, and the drive assembly can drive the baffle gear to rotate; the drive plate is fixed on one of the baffle shafts and can extend and retract the pushing mechanism.

5. A construction waste crushing device according to claim 4, characterized in that, The drive assembly includes a drive motor and a drive gear; the drive motor is mounted on the cavity, and the drive gear is coaxially fixed on the output shaft of the drive motor and meshes with a baffle gear.

6. A construction waste crushing device according to claim 5, characterized in that, The feeding mechanism includes a first electric telescopic rod, a first feeding plate, and a connecting rope; the first electric telescopic rod is disposed on the cavity, and the first feeding plate is fixed to the telescopic end of the first electric telescopic rod and closely attached to the magnetic filter on the side facing the crushing unit; one end of the connecting rope is connected to the telescopic end of the first electric telescopic rod, and the other end is connected to the collecting mechanism, and the extension of the first electric telescopic rod can drive the collecting mechanism to rotate through the connecting rope.

7. A construction waste crushing device according to claim 6, characterized in that, The collection mechanism includes a collection shaft, a collection box, and a torsion spring; the collection shaft is rotatably disposed in the cavity, the collection box is fixed on the collection shaft and connected to the cavity through the torsion spring, one end of the connecting rope is connected to the collection box, and the other end is connected to the telescopic end of the first electric telescopic rod.

8. A construction waste crushing device according to claim 7, characterized in that, The vacuuming mechanism includes a water tank, a first air pump, a vacuum pipe, and a vacuum hood; the water tank is located on the cavity and is connected to the vacuum pipe through the first air pump; the vacuum hood is located at the end of the vacuum pipe and faces the magnetic filter.

9. A construction waste crushing device according to claim 8, characterized in that, The magnetic filter screen is provided in multiple sets, with the pore size decreasing and the magnetism increasing sequentially from top to bottom.

10. A construction waste crushing device according to claim 9, characterized in that, It also includes a guide pipe, a second air pump, a second electric telescopic rod, and a second pusher plate; the guide pipe faces the uppermost magnetic filter screen, one end of the guide pipe passes through the cavity, and the other end is connected to the second air pump, which is located on the top surface of the cavity; the second electric telescopic rod is located on the cavity, and the second pusher plate is fixed to the telescopic end of the second electric telescopic rod, which can push the metal waste adsorbed by the uppermost magnetic filter screen into the guide pipe.

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