A dry slag removal device for hazardous waste incineration

Abstract

The invention discloses a dry slag discharge device for hazardous waste incineration, and specifically relates to the field of slag discharge equipment for incinerators, comprising a support platform, an incinerator is arranged on the top of the support platform, a smoke exhaust furnace is arranged on the top of the incinerator, a slag discharge port is arranged at the bottom of the incinerator, and a cross heat absorption mechanism and a shifting mechanism are arranged at the bottom of the slag discharge port, the cross heat absorption mechanism comprises a discharge trough arranged at the bottom of the slag discharge port, and the discharge trough is fixedly installed on the top of the support platform; the invention provides a cross heat absorption mechanism and a shifting mechanism, and then intercepts the waste slag during the slag discharge process and clamps the waste slag through water-cooled metal plates, so as to cool the waste slag, facilitate transportation of the waste slag after cooling, and avoid direct recovery and water pollution caused by contact between the waste slag and water, and at the same time, a pressing and cutting slag discharge mechanism is provided, and the waste slag is crushed and poured out by a cutter that moves back and forth up and down, so as to facilitate rapid discharge of the waste slag.

Description

Technical Field

[0001] The present invention relates to the technical field of incinerator slag removal equipment, and more specifically, to a dry slag removal device for hazardous waste incineration. Background Art

[0002] At present, garbage disposal has developed from traditional landfill to incineration and comprehensive utilization. Among them, domestic garbage and medical garbage are increasingly valued by people due to their high calorific value and the advantage of incineration that can effectively remove germs. Garbage incinerators use fossil fuels such as coal to ignite garbage for incineration. The heat generated by incineration turns water into steam, and the steam drives the steam turbine to generate electricity and dispose of the garbage at the same time. After garbage incineration, a large amount of waste residue is generated, which needs to be guided out of the incinerator through pipes to facilitate the continued burning of the remaining garbage.

[0003] Traditional hazardous waste incineration furnace slag mostly uses a water-sealed slag remover to remove slag in a wet manner, and then cools the slag for easy transportation. Because the existing technology uses wet slag removal, the discharged slag cannot be directly transported and recycled due to moisture, and causes a large amount of water pollution and waste. At the same time, the existing technology is unable to break up the lumps formed by the waste slag after incineration, resulting in the waste slag being too large in volume and affecting its discharge efficiency.

[0004] In view of the above technical defects, a solution is now provided. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a dry slag discharge device for hazardous waste incineration, which is equipped with a cross heat absorption mechanism and a pushing mechanism to cooperate with each other, and then intercept the waste slag in the slag discharge process and clamp the waste slag by water-cooled metal plates, so as to cool the waste slag, facilitate the transportation of the waste slag after cooling, and avoid the waste slag from contacting water, which makes it impossible to directly recycle and causes water pollution. At the same time, a pressing and cutting slag discharge mechanism is also auxiliaryly provided, and the waste slag is crushed by a cutter that moves reciprocatingly up and down, so that the waste slag is quickly discharged, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a dry slag discharge device for hazardous waste incineration, comprising a support platform, an incinerator is arranged on the top of the support platform, a smoke exhaust furnace is arranged on the top of the incinerator, a slag discharge port is arranged at the bottom of the incinerator, and a cross heat absorption mechanism and a shifting mechanism are arranged at the bottom of the slag discharge port;

[0007] The cross heat absorption mechanism includes a discharge trough arranged at the bottom of the slag discharge port, the discharge trough is fixedly installed on the top of the support platform, the discharge trough is arranged to be inclined downward, and a plurality of rectangular grooves are opened at the bottom of the discharge trough, and the inner walls of the plurality of rectangular grooves are jointly provided with a first metal plate, and the first metal plate is slidably installed on the top of the support platform, the first metal plate and the discharge trough are arranged corresponding to each other, the first metal plate is arranged in a mountain shape, the outer wall of the first metal plate is in contact with the inner walls of the plurality of rectangular grooves, the top of the first metal plate is flush with the bottom of the discharge trough, and the inner wall of the first metal plate is arranged in a hollow shape.

[0008] In a preferred embodiment, one side of the first metal plate is connected to multiple water inlets, and the multiple water inlets are arranged to be inclined upward. One side of the multiple water inlets is commonly connected to a water inlet pipe, and one side of the water inlet pipe is provided with a water pump body, and the water pump body is fixedly installed on the top of the support platform.

[0009] In a preferred embodiment, the other side of the water inlet pipe is connected to a second metal plate, the second metal plate is slidably installed on the top of the support platform, the second metal plate and the first metal plate are arranged corresponding to each other, the second metal plate and the first metal plate are staggered with each other, the second metal plate is located at the top of the discharge trough, and the second metal plate and one side of the first metal plate are commonly connected to a drainage pipe.

[0010] In a preferred embodiment, the pushing and moving mechanism includes a first fixed pulling plate fixedly installed on the outer walls of both sides of the first metal plate, the two first fixed pulling plates are arranged in a horizontal state, and a second fixed pulling plate is provided on the top of the two first fixed pulling plates, and the two second fixed pulling plates are respectively fixedly installed on the outer walls of both sides of the second metal plate, and the two second fixed pulling plates are arranged in a horizontal state, and the two first fixed pulling plates and the second fixed pulling plates are respectively threadedly connected with reciprocating threaded rods, and the two reciprocating threaded rods are rotatably installed on the top of the support platform, and the two reciprocating threaded rods are arranged in a vertical state, and the two reciprocating threaded rods and the first fixed pulling plate and the second fixed pulling plate are arranged perpendicular to each other.

[0011] In a preferred embodiment, a motor is provided at the bottom of the reciprocating threaded rod, and the motor is fixedly mounted on the top of the support platform. Pulleys are fixedly mounted on the tops of the two reciprocating threaded rods respectively, and a synchronous belt is installed on the outer walls of the two pulleys for joint rotation.

[0012] In a preferred embodiment, a pressure-cutting and slag-removing mechanism is provided at the bottom of the discharge trough, and the pressure-cutting and slag-removing mechanism includes a receiving bracket fixedly installed at the bottom of the discharge trough, and the receiving bracket is arranged in a horizontal state. The outer walls of the two second fixed pulling plates are fixedly installed with the same belt plates, and the two same belt plates are slidably installed on the inner wall of the support platform. The bottoms of the two same belt plates are fixedly installed with a compression plate, and the bottoms of the compression plate are fixedly installed with a cutter, and the cutter is arranged vertically downward.

[0013] In a preferred embodiment, a metal flap is provided at the bottom of the cutter, and the metal flap is rotatably mounted on the inner wall of the receiving bracket. Lifting plates are fixedly mounted on both sides of the pressing plate, and magnet blocks are hinged at the bottom of the two lifting plates. The two magnet blocks are arranged vertically downward, and the two magnet blocks and the metal flap are arranged corresponding to each other.

[0014] Technical effects and advantages of the present invention:

[0015] 1. The present invention is provided with a cross heat absorption mechanism and a pushing mechanism. The waste slag falling from the slag discharge port slides up and down the discharge trough. The water pump body sends cold water into multiple water inlets through the water inlet pipe and then to the top of the first metal plate. At this time, the motor drives the reciprocating threaded rod on one side to rotate synchronously through the pulley and the synchronous belt. The reciprocating threaded rods on both sides rotate synchronously to drive the first fixed pull plate and the second fixed pull plate on both sides to move relative to each other, that is, drive the first metal plate and the second metal plate to move synchronously with each other, and then the second metal plate approaches the first metal plate synchronously. When the first metal plate moves upward, it can contact the waste slag on the discharge trough through multiple rectangular grooves. The second metal plate approaches the first metal plate synchronously and staggeredly to clamp the waste slag in the middle for heat absorption and cooling, and discharges the heat-absorbing water through the drain pipe for other uses. This avoids contamination caused by direct contact between water and waste slag, and avoids the inability to directly recycle and transport the waste slag due to moisture.

[0016] 2. At the same time, by setting up a pressure-cutting and slag-discharging mechanism, the cooled waste slag is sent out through the discharge trough and falls on the metal flap in the receiving trough. Then, the downward movement of the two second fixed-pull plates drives the two plates with the same belt to move downward synchronously, and then the two plates with the same belt move downward synchronously to drive the extrusion plate to make the cutter cut downward synchronously, thereby crushing the waste slag. At the same time, the lifting plates on both sides of the extrusion plate drive the magnet blocks to move downward synchronously and adsorb the top of the metal flap. When the extrusion plate is driven upward by the second fixed-pull plate, the metal flap is pulled by the magnet block, and then the metal flap is deflected to quickly pour out the waste slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a front view of the present invention.

[0019] Figure 3 It is a partial cross-sectional view of the shifting mechanism in the present invention.

[0020] Figure 4 For the present invention Figure 3 A-section structure enlarged view.

[0021] Figure 5 It is a partial vertical sectional view of the present invention.

[0022] Figure 6 It is a cross-sectional view of the pressing and cutting slag removal mechanism in the present invention.

[0023] Figure 7 For the present invention Figure 6 Enlarged view of the structure of part B.

[0024] The accompanying drawings are marked as follows: 1. support platform; 2. incinerator; 3. smoke exhaust furnace; 4. slag discharge port; 5. cross heat absorption mechanism; 51. discharge trough; 52. first metal plate; 53. water inlet; 54. water inlet pipe; 55. water pump body; 56. second metal plate; 57. drain pipe; 6. shifting and pushing mechanism; 61. first fixed pull plate; 62. second fixed pull plate; 63. reciprocating threaded rod; 64. motor; 65. pulley; 66. synchronous belt; 7. pressing and cutting slag discharge mechanism; 71. connecting bracket; 72. same belt plate; 73. extrusion plate; 74. cutting knife; 75. metal flap; 76. lifting plate; 77. magnet block. DETAILED DESCRIPTION

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

[0026] Embodiment 1: Since the prior art adopts wet slag discharge, the discharged waste slag cannot be directly transported and recycled due to moisture, and causes a large amount of water pollution and waste. To solve this problem, the following technical solution is proposed:

[0027] Refer to the instruction manual Figure 1-Figure 7 , a dry slag removal device for hazardous waste incineration, such as Figure 1 and Figure 2 As shown, it comprises a support platform 1, an incinerator 2 is arranged on the top of the support platform 1, a smoke exhaust furnace 3 is arranged on the top of the incinerator 2, a slag discharge port 4 is arranged at the bottom of the incinerator 2, and a cross heat absorption mechanism 5 and a moving and pushing mechanism 6 are arranged at the bottom of the slag discharge port 4;

[0028] like Figure 3 and Figure 4As shown, the cross heat absorption mechanism 5 includes a discharge trough 51 arranged at the bottom of the slag discharge port 4, the discharge trough 51 is fixedly installed on the top of the support platform 1, the discharge trough 51 is inclined downward, and a plurality of rectangular grooves are opened at the bottom of the discharge trough 51, and the inner walls of the plurality of rectangular grooves are jointly provided with a first metal plate 52, and the first metal plate 52 is slidably installed on the top of the support platform 1, the first metal plate 52 and the discharge trough 51 are arranged corresponding to each other, the first metal plate 52 is arranged in a mountain shape, the outer wall of the first metal plate 52 is fitted with the inner walls of the plurality of rectangular grooves, the top of the first metal plate 52 is flush with the bottom of the discharge trough 51, and the inner wall of the first metal plate 52 is arranged in a hollow shape, so that the waste slag falling from the slag discharge port 4 falls on the discharge trough 51, and the waste slag slides down through the inclined surface of the discharge trough 51, and the first metal plate 52 can contact the waste slag on the discharge trough 51 through the plurality of rectangular grooves when moving upward, and the temperature of the waste slag is cooled by absorbing water in the first metal plate 52.

[0029] like Figure 3 and Figure 4 As shown, one side of the first metal plate 52 is connected to a plurality of water inlets 53, and the plurality of water inlets 53 are arranged to be inclined upward. One side of the plurality of water inlets 53 is commonly connected to a water inlet pipe 54, and one side of the water inlet pipe 54 is provided with a water pump body 55, and the water pump body 55 is fixedly installed on the top of the support platform 1. Cold water is sent into the plurality of water inlets 53 through the water inlet pipe 54 through the water pump body 55, and water is sent to the top of the first metal plate 52 through the plurality of water inlets 53, so that the protruding part on the top of the first metal plate 52 can contact with the waste slag and absorb heat.

[0030] like Figure 3 and Figure 4 As shown, the other side of the water inlet pipe 54 is connected to a second metal plate 56, and the second metal plate 56 is slidably installed on the top of the support platform 1. The second metal plate 56 and the first metal plate 52 are arranged corresponding to each other, and the second metal plate 56 and the first metal plate 52 are staggered with each other. The second metal plate 56 is located at the top of the discharge trough 51, and the second metal plate 56 and one side of the first metal plate 52 are commonly connected to a drain pipe 57, and then the second metal plate 56 is synchronously close to the first metal plate 52, so that the waste residue is clamped in the middle for heat absorption and cooling, and the water after heat absorption is discharged through the drain pipe 57 for other uses, avoiding water from being contaminated by direct contact with the waste residue, and avoiding the waste residue from being directly recycled and transported due to moisture.

[0031] like Figure 5As shown, the pushing and shifting mechanism 6 includes a first fixed pulling plate 61 fixedly mounted on the outer walls of both sides of the first metal plate 52, the two first fixed pulling plates 61 are arranged in a horizontal state, and a second fixed pulling plate 62 is arranged on the top of the two first fixed pulling plates 61, and the two second fixed pulling plates 62 are respectively fixedly mounted on the outer walls of both sides of the second metal plate 56, and the two second fixed pulling plates 62 are arranged in a horizontal state, and the two first fixed pulling plates 61 and the second fixed pulling plates 62 are respectively threadedly connected with a reciprocating threaded rod 63, and the two reciprocating threaded rods 63 are rotatably mounted on the top of the support platform 1, and the two reciprocating threaded rods 63 are arranged in a vertical state, and the two reciprocating threaded rods 63 and the first fixed pulling plates 61 and the second fixed pulling plates 62 are arranged perpendicular to each other, and the synchronous rotation of the reciprocating threaded rods 63 on both sides drives the first fixed pulling plates 61 and the second fixed pulling plates 62 on both sides to move relative to each other, thereby driving the first metal plate 52 and the second metal plate 56 to move relative to each other synchronously.

[0032] like Figure 5 As shown, a motor 64 is provided at the bottom of the reciprocating threaded rod 63, and the motor 64 is fixedly installed on the top of the support platform 1. Pulleys 65 are fixedly installed on the tops of the two reciprocating threaded rods 63 respectively, and a synchronous belt 66 is installed on the outer walls of the two pulleys 65 for rotating together, so that the motor 64 drives the reciprocating threaded rod 63 on one side to rotate, that is, the reciprocating threaded rod 63 rotates synchronously with the other reciprocating threaded rod 63 through the pulley 65 and the synchronous belt 66.

[0033] In the specific implementation, the waste slag falling from the slag discharge port 4 falls on the discharge trough 51, and the inclined surface of the discharge trough 51 makes the waste slag slide down. The cold water is sent into the multiple water inlets 53 through the water pump body 55 through the water inlet pipe 54, and the water is sent to the top of the first metal plate 52 through the multiple water inlets 53. At this time, the motor 64 drives the reciprocating threaded rod 63 on one side to rotate, that is, the reciprocating threaded rod 63 drives the other reciprocating threaded rod 63 to rotate synchronously through the pulley 65 and the synchronous belt 66, and the reciprocating threaded rods 63 on both sides rotate synchronously to drive the first fixed pull plate 61 and the second fixed pull plate 62 on both sides to rotate synchronously. The first metal plate 52 and the second metal plate 56 move synchronously with each other, and then the second metal plate 56 approaches the first metal plate 52 synchronously. When the first metal plate 52 moves upward, it can contact the waste slag on the discharge trough 51 through multiple rectangular grooves. The second metal plate 56 approaches the first metal plate 52 synchronously and staggered to clamp the waste slag in the middle for heat absorption and cooling, and discharges the heat-absorbing water through the drain pipe 57 for other uses, which not only avoids the water from being contaminated by direct contact with the waste slag, but also avoids the waste slag from being directly recycled and transported due to moisture.

[0034] Embodiment 2: In view of the fact that the existing technology cannot crush the lumps formed after the waste slag is incinerated, resulting in the waste slag being too large and affecting its discharge efficiency, the following technical solution is proposed to solve this problem:

[0035] like Figure 6 and Figure 7 As shown, a pressing and cutting slag discharge mechanism 7 is provided at the bottom of the discharge trough 51, and the pressing and cutting slag discharge mechanism 7 includes a receiving bracket 71 fixedly installed at the bottom of the discharge trough 51, and the receiving bracket 71 is arranged in a horizontal state. The outer walls of the two second fixed pulling plates 62 are fixedly installed with the same belt plates 72, and the two same belt plates 72 are slidably installed on the inner wall of the support platform 1. The bottoms of the two same belt plates 72 are fixedly installed with a compression plate 73, and the bottoms of the compression plate 73 are fixedly installed with a cutter 74, and the cutter 74 is arranged vertically downward. The cooled waste slag sent out through the discharge trough 51 falls into the receiving bracket 71, and at the same time, the downward movement of the two second fixed pulling plates 62 drives the two same belt plates 72 to move downward synchronously, and then the two same belt plates 72 move downward synchronously to drive the compression plate 73 so that the cutter 74 cuts downward synchronously, thereby crushing the waste slag.

[0036] like Figure 6 and Figure 7 As shown, a metal flap 75 is provided at the bottom of the cutter 74, and the metal flap 75 is rotatably mounted on the inner wall of the receiving bracket 71. Lifting plates 76 are fixedly mounted on both sides of the squeezing plate 73. The bottoms of the two lifting plates 76 are hinged with magnet blocks 77. The two magnet blocks 77 are arranged vertically downward, and the two magnet blocks 77 and the metal flap 75 are arranged corresponding to each other. Then, waste slag falls on the metal flap 75, and when the squeezing plate 73 drives the cutter 74 to cut the waste slag, the lifting plates 76 on both sides of the squeezing plate 73 drive the magnet blocks 77 to move downward synchronously and adsorb the top of the metal flap 75, and then when the squeezing plate 73 is driven to move upward by the second fixed pulling plate 62, the metal flap 75 is pulled by the magnet blocks 77, and then the metal flap 75 is deflected to pour out the waste slag, and after the magnet blocks 77 continue to move upward, they are separated from the metal flap 75, and the metal flap 75 is reset to receive the waste slag again.

[0037] In the specific implementation, the cooled waste slag is sent out through the discharge trough 51 and falls on the metal flap 75 in the receiving groove 71, and the downward movement of the two second fixed pulling plates 62 drives the two same-belt plates 72 to move downward synchronously, and then the two same-belt plates 72 move downward synchronously to drive the squeezing plate 73 to make the cutter 74 cut downward synchronously, thereby crushing the waste slag. At the same time, the lifting plates 76 on both sides of the squeezing plate 73 drive the magnet block 77 to move downward synchronously and adsorb the top of the metal flap 75. When the squeezing plate 73 is driven to move upward by the second fixed pulling plate 62, the metal flap 75 is pulled by the magnet block 77, and then the metal flap 75 is deflected to quickly pour out the waste slag, and after the magnet block 77 continues to move upward, it separates from the metal flap 75, and the metal flap 75 is reset to receive the waste slag again.

[0038] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0039] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0040] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dry slag discharge device for hazardous waste incineration, comprising a support platform (1), an incinerator (2) being arranged on the top of the support platform (1), a smoke exhaust furnace (3) being arranged on the top of the incinerator (2), and a slag discharge port (4) being arranged at the bottom of the incinerator (2), characterized in that: The bottom of the slag discharge port (4) is provided with a cross heat absorption mechanism (5) and a shifting mechanism (6); The cross heat absorption mechanism (5) comprises a discharge trough (51) arranged at the bottom of the slag discharge port (4), the discharge trough (51) is fixedly mounted on the top of the support platform (1), the discharge trough (51) is arranged in an inclined downward direction, a plurality of rectangular grooves are opened at the bottom of the discharge trough (51), the inner walls of the plurality of rectangular grooves are jointly provided with a first metal plate (52), the first metal plate (52) is slidably mounted on the top of the support platform (1), the first metal plate (52) and the discharge trough (51) are arranged in correspondence with each other, the first metal plate (52) is arranged in a mountain shape, the outer wall of the first metal plate (52) and the inner walls of the plurality of rectangular grooves are mutually fitted, the top of the first metal plate (52) and the bottom of the discharge trough (51) are flush with each other, and the inner wall of the first metal plate (52) is arranged in a hollow shape; One side of the first metal plate (52) is connected to a plurality of water inlets (53), the plurality of water inlets (53) are arranged obliquely upward, one side of the plurality of water inlets (53) is commonly connected to a water inlet pipe (54), one side of the water inlet pipe (54) is provided with a water pump body (55), and the water pump body (55) is fixedly mounted on the top of the support platform (1); The other side of the water inlet pipe (54) is connected to a second metal plate (56), the second metal plate (56) is slidably mounted on the top of the support platform (1), the second metal plate (56) and the first metal plate (52) are arranged corresponding to each other, the second metal plate (56) and the first metal plate (52) are arranged staggered with each other, the second metal plate (56) is located on the top of the discharge trough (51), and the second metal plate (56) and one side of the first metal plate (52) are connected to a drainage pipe (57); The pushing and shifting mechanism (6) comprises a first fixed pull plate (61) fixedly mounted on the outer walls of both sides of the first metal plate (52), the two first fixed pull plates (61) being arranged in a horizontal state, a second fixed pull plate (62) being arranged on the top of the two first fixed pull plates (61), the two second fixed pull plates (62) being respectively fixedly mounted on the outer walls of both sides of the second metal plate (56), the two second fixed pull plates (62) being arranged in a horizontal state, the two first fixed pull plates (61) and the second fixed pull plates (62) being respectively threadedly connected with a reciprocating threaded rod (63), the two reciprocating threaded rods (63) being rotatably mounted on the top of the support platform (1), the two reciprocating threaded rods (63) being arranged in a vertical state, and the two reciprocating threaded rods (63) and the first fixed pull plates (61) and the second fixed pull plates (62) being arranged perpendicular to each other; A motor (64) is provided at the bottom of the reciprocating threaded rod (63), and the motor (64) is fixedly mounted on the top of the support platform (1). Pulleys (65) are respectively fixedly mounted on the tops of the two reciprocating threaded rods (63), and a synchronous belt (66) is mounted on the outer walls of the two pulleys (65) for joint rotation.

2. A dry slag removal device for hazardous waste incineration according to claim 1, characterized in that: A pressing and cutting slag discharge mechanism (7) is provided at the bottom of the discharge trough (51), and the pressing and cutting slag discharge mechanism (7) comprises a receiving bracket (71) fixedly mounted at the bottom of the discharge trough (51), the receiving bracket (71) being arranged in a horizontal state, a band plate (72) being fixedly mounted on the outer walls of the two second fixed pulling plates (62), the two band plates (72) being slidably mounted on the inner wall of the support platform (1), a pressing plate (73) being fixedly mounted at the bottom of the two band plates (72), a cutting knife (74) being fixedly mounted at the bottom of the pressing plate (73), and the cutting knife (74) being arranged vertically downward.

3. A dry slag removal device for hazardous waste incineration according to claim 2, characterized in that: A metal flap (75) is provided at the bottom of the cutter (74), and the metal flap (75) is rotatably mounted on the inner wall of the receiving bracket (71). Lifting plates (76) are fixedly mounted on both sides of the pressing plate (73), and magnet blocks (77) are hingedly connected at the bottom of the two lifting plates (76). The two magnet blocks (77) are arranged vertically downward, and the two magnet blocks (77) and the metal flap (75) are arranged corresponding to each other.

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