Smelting furnace with fuel recovery function

Abstract

The invention relates to the technical field of smelting furnaces, and discloses a smelting furnace with a fuel recovery function, which solves the problem of waste caused by incapability of recovering unburnt fuel at present, and comprises a furnace body, a fuel recovery mechanism is arranged at the bottom of the furnace body, and an anti-blocking mechanism and a blocking mechanism are arranged on the fuel recovery mechanism. The fuel recycling mechanism comprises a discharging box fixed to the bottom of the furnace body, a receiving hopper is arranged on the outer side of the discharging box, a recycling box is fixedly connected to the bottom of the receiving hopper, a discharging hopper is fixedly connected to the bottom of the recycling box, a discharging opening is formed in the bottom of the discharging hopper, a sealing cover is arranged on the discharging opening, and two supporting shafts are symmetrically and rotationally connected to the outer side of the discharging box. According to the device, fuel with large particles on the upper sieve plate can be discharged from the upper discharging port, fuel with large particles on the lower sieve plate can be discharged from the lower discharging port, and therefore the fuel which is not burnt thoroughly can be conveniently recycled.

Description

Technical Field

[0001] The invention belongs to the technical field of smelting furnaces, and in particular relates to a smelting furnace with a fuel recovery function. Background Art

[0002] A smelting furnace refers to a device that melts metal ingots and some scrap metals and adds necessary alloy components, and then smelts them into the required alloys through operations such as slagging and refining. According to the heating energy, smelting furnaces can be divided into the following two types: fuel heating type and electric heating type. Smelting furnaces are widely used in the field of metal processing. Hydrogen storage material is a material that can store hydrogen. Its preparation process usually requires smelting, atomization and other steps. As an advanced metal powder preparation equipment, vacuum melting atomization furnace plays an important role in the preparation process of hydrogen storage materials.

[0003] The smelting furnace in the prior art generally directly discharges fuel residues when in use, resulting in an inability to recycle unburned fuel, thereby causing a waste of fuel. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a smelting furnace with a fuel recovery function, which effectively solves the problem of the waste caused by the inability to recover the unburned fuel.

[0005] To achieve the above object, the present invention provides the following technical solution: a smelting furnace with a fuel recovery function, comprising a furnace body, a fuel recovery mechanism is provided at the bottom of the furnace body, and an anti-blocking mechanism and a blocking mechanism are provided on the fuel recovery mechanism;

[0006] The fuel recovery mechanism includes a feed box fixed to the bottom of the furnace body, a receiving hopper is provided on the outside of the feed box, a recovery box is fixedly connected to the bottom of the receiving hopper, a feed port is fixedly connected to the bottom of the recovery box, a sealing cover is provided on the feed port, two support shafts are symmetrically rotatably connected to the outside of the feed box, one end of the two support shafts away from the feed box is fixedly connected to the inner wall of the receiving hopper, a lower sieve plate and an upper sieve plate are movably installed inside the recovery box, the lower sieve plate is located below the upper sieve plate, the inner diameter of the sieve holes on the upper sieve plate is greater than the inner diameter of the sieve holes on the lower sieve plate, an upper discharge port and a lower discharge port are respectively provided on both sides of the recovery box, an upper cover plate and a lower cover plate are respectively provided on both sides of the recovery box, the upper cover plate corresponds to the upper discharge port, and the lower cover plate corresponds to the lower discharge port.

[0007] Preferably, a U-shaped rod located above the receiving hopper is fixedly connected between the discharge box and the furnace body, a mounting plate is movably sleeved on the outer side of the U-shaped rod, two L-shaped rods are symmetrically fixedly connected between the receiving hopper and the recovery box, a slide plate is movably sleeved between the two L-shaped rods, and the mounting plate is rotatably connected to the slide plate.

[0008] Preferably, the outer side of the U-shaped rod is fixedly sleeved with a sleeve block, the outer side of the sleeve block is rotatably connected to a screw rod, the end of the screw rod away from the sleeve block is fixedly connected to a drive motor, the drive motor is fixed to the outer side of the discharge box, the outer side of the screw rod is threadedly sleeved with a screw sleeve, and the mounting plate is fixed to the bottom of the screw sleeve.

[0009] Preferably, the anti-blocking mechanism includes two columns symmetrically fixed to the top of the lower screen plate, the upper screen plate is fixedly sleeved on the outside of the two columns, the top ends of the two columns extend to the outside of the recycling box and are fixedly connected to the same bracket, the outsides of the two columns are fixedly sleeved with abutment rings, the two abutment rings are located at the top of the recycling box, two guide columns are symmetrically fixedly connected between the recycling box and the receiving hopper, the bracket is movably sleeved on the outside of the two guide columns, and two vibration springs are symmetrically fixedly connected between the bracket and the recycling box, and the two vibration springs are respectively sleeved on the outside of the two guide columns.

[0010] Preferably, a left L-shaped plate is fixedly installed on the outer side of the receiving hopper, and a right L-shaped plate is fixedly installed on the outer side of the recovery box. Two driven shafts are symmetrically rotatably connected between the left L-shaped plate and the right L-shaped plate. Eccentric blocks are fixedly installed on the outer sides of the two driven shafts, and the two eccentric blocks are located below the bracket.

[0011] Preferably, a rotating motor is fixedly mounted on the left L-shaped plate, a driving shaft located below the bracket is fixedly connected to the rotating motor, one end of the driving shaft away from the rotating motor is rotatably connected to the receiving hopper, a driving gear is fixedly mounted on the outer side of the driving shaft, and driven gears are fixedly mounted on the outer sides of the two driven shafts, and the two driven gears are meshingly connected to the driving gear.

[0012] Preferably, the blocking mechanism includes a side plate located on the outside of the material box, to which a blocking plate is fixedly connected, the blocking plate is inserted into the material box, two positioning columns are symmetrically fixedly connected to the outside of the material box, the side plate is sleeved on the outside of the two positioning columns, and an abutment block is fixedly connected to the bottom of the blocking plate.

[0013] Preferably, the outer side of the discharge box is fixedly connected with a side block located below the side plate, a sliding rod is fixedly connected between the bottom of the side block and the outer side of the discharge box, a sliding block is movably sleeved on the outer side of the sliding rod, a return spring is fixedly connected between the sliding block and the side block, the return spring is sleeved on the outer side of the sliding rod, and an insert plate is fixedly connected to the top of the sliding block, the insert plate passes through the side block and is movably connected to the side block.

[0014] Preferably, a slot is provided at the bottom of the side plate, and a bottom groove is provided at the bottom of the blocking plate. Both the bottom groove and the slot are adapted to the plug-in plate, and the plug-in plate is inserted into the slot.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention facilitates the unburned fuel in the furnace body to enter the recovery box through the cooperation between the lower material box and the receiving hopper for screening through the upper sieve plate and the lower sieve plate, so that the fuel with the smallest particles can be discharged from the discharge port through the lower material box, and the cooperation between the driving motor, the screw, the screw sleeve, the mounting plate, the U-shaped rod, the slide plate, the L-shaped rod, the receiving hopper and the supporting shaft facilitates the rotation of the receiving hopper and the recovery box, and then the fuel with larger particles on the upper sieve plate can be discharged from the upper discharge port, and the fuel with larger particles on the lower sieve plate can be discharged from the lower discharge port, so that it is convenient to recover the unburned fuel.

[0017] 2. The invention facilitates the rotation of the two eccentric blocks to impact the bracket through the cooperation between the rotating motor, the driving shaft, the driving gear, the driven gear and the driven shaft, and facilitates the vibration of the upper and lower sieve plates to avoid blockage through the cooperation between the bracket and the guide column and the vibration spring and the column, thereby improving the screening efficiency of unburned fuel.

[0018] 3. The invention facilitates the movement of the blocking plate through the cooperation between the side plate, the blocking plate and the abutment block so that the side of the abutment block close to the side plate abuts against the inner wall of the discharge box, and facilitates the insertion of the plug plate into the bottom groove through the cooperation between the side block and the slide rod, as well as the slide block and the return spring, so that the blocking plate can be fixed after movement, thereby facilitating the fall of unburned fuel in the furnace body for recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] In the attached picture:

[0021] Figure 1 It is a schematic diagram of the structure of a smelting furnace with a fuel recovery function according to the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the fuel recovery mechanism of the present invention;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the recycling box of the present invention;

[0024] Figure 4 This is a schematic diagram of the anti-blocking mechanism structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the connection structure between the left L-shaped plate and the right L-shaped plate of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the blocking mechanism of the present invention;

[0027] Figure 7This is a schematic diagram of the cross-sectional structure of the blanking box of the present invention;

[0028] Figure 8 It is a schematic diagram of the disassembled structure of the side plate and the slide rod of the present invention.

[0029] In the figure: 1. furnace body; 2. fuel recovery mechanism; 201. material discharge box; 202. support shaft; 203. receiving hopper; 204. recovery box; 205. L-shaped rod; 206. discharge port; 207. sealing cover; 208. lower cover plate; 209. slide plate; 2010. mounting plate; 2011. sleeve block; 2012. U-shaped rod; 2013. screw sleeve; 2014. screw rod; 2015. driving motor; 2016. lower sieve plate; 2017. upper sieve plate; 2018. upper cover plate; 2019. upper discharge port; 2020. material discharge hopper; 2021. lower discharge port; 3. anti-blocking mechanism; 301, column; 302, left L-shaped plate; 303, right L-shaped plate; 304, vibration spring; 305, eccentric block; 306, bracket; 307, driving shaft; 308, driving gear; 309, rotating motor; 3010, driven gear; 3011, abutment ring; 3012, guide column; 3013, driven shaft; 4, blocking mechanism; 401, side plate; 402, positioning column; 403, blocking plate; 404, sliding rod; 405, abutment block; 406, bottom groove; 407, reset spring; 408, plug plate; 409, slot; 4010, side block; 4011, slider. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Embodiment 1, by Figure 1-Figure 8 The present invention relates to a smelting furnace with a fuel recovery function, comprising a furnace body 1, a fuel recovery mechanism 2 is provided at the bottom of the furnace body 1, and an anti-blocking mechanism 3 and a blocking mechanism 4 are provided on the fuel recovery mechanism 2.

[0032] Embodiment 2, on the basis of embodiment 1, the fuel recovery mechanism 2 comprises a feed box 201 fixed to the bottom of the furnace body 1, a receiving hopper 203 is arranged on the outside of the feed box 201, a recovery box 204 is fixedly connected to the bottom of the receiving hopper 203, a feed hopper 2020 is fixedly connected to the bottom of the recovery box 204, a discharge port 206 is arranged at the bottom of the feed hopper 2020, a sealing cover 207 is arranged on the discharge port 206, and two support shafts 202 are symmetrically connected to the outside of the feed box 201 for rotation, and the two support shafts 202 are far away from the feed box One end of 201 is fixedly connected to the inner wall of the receiving hopper 203, and the interior of the recycling box 204 is movably installed with a lower sieve plate 2016 and an upper sieve plate 2017, the lower sieve plate 2016 is located below the upper sieve plate 2017, the inner diameter value of the sieve hole on the upper sieve plate 2017 is greater than the inner diameter value of the sieve hole on the lower sieve plate 2016, and the two sides of the recycling box 204 are respectively provided with an upper discharge port 2019 and a lower discharge port 2021, the inner bottom surface of the upper discharge port 2019 is at the same height as the top surface of the upper sieve plate 2017, and the inner bottom surface of the lower discharge port 2021 is at the same height as the top surface of the upper sieve plate 2017. The top surface of the lower sieve plate 2016 is at the same height, and an upper cover plate 2018 and a lower cover plate 208 are respectively provided on both sides of the recovery box 204. The upper cover plate 2018 corresponds to the upper discharge port 2019, and the lower cover plate 208 corresponds to the lower discharge port 2021. A U-shaped rod 2012 located above the receiving hopper 203 is fixedly connected between the lower material box 201 and the furnace body 1, and a mounting plate 2010 is movably sleeved on the outer side of the U-shaped rod 2012. Two L-shaped rods 205 are symmetrically fixedly connected between the receiving hopper 203 and the recovery box 204. A slide plate 209 is movably sleeved between the two L-shaped rods 205, a mounting plate 2010 is rotatably connected to the slide plate 209, a sleeve block 2011 is fixedly sleeved on the outer side of the U-shaped rod 2012, a screw rod 2014 is rotatably connected to the outer side of the sleeve block 2011, a drive motor 2015 is fixedly connected to one end of the screw rod 2014 away from the sleeve block 2011, the drive motor 2015 is fixed to the outer side of the discharge box 201, a screw sleeve 2013 is threadedly sleeved on the outer side of the screw rod 2014, and the mounting plate 2010 is fixed to the bottom of the screw sleeve 2013;

[0033] First, the unburned fuel in the furnace body 1 passes through the lower material box 201 and the receiving hopper 203 into the recovery box 204, and the fuel is screened by the upper screen plate 2017 and the lower screen plate 2016. Then, the sealing cover 207, the lower cover plate 208 and the upper cover plate 2018 are opened, and the fuel with the smallest particles can be discharged from the discharge port 206 through the lower material hopper 2020. Then, the driving motor 215 is started to drive the screw 214 to rotate, and the mounting plate 210 is driven along the screw sleeve 213. The U-shaped rod 2012 slides, and then drives the slide plate 209 to slide along the two L-shaped rods 205. Since the two support shafts 202 fixed on the receiving hopper 203 are both rotatably connected to the outside of the discharge box 201, the receiving hopper 203 and the recovery box 204 are driven to rotate, so that the fuel with larger particles on the upper screen plate 2017 is discharged from the upper discharge port 2019, and the fuel with larger particles on the lower screen plate 2016 is discharged from the lower discharge port 2021, and finally the unburned fuel is recovered.

[0034] Embodiment 3, on the basis of embodiment 1, the anti-blocking mechanism 3 includes two columns 301 symmetrically fixed on the top of the lower sieve plate 2016, the upper sieve plate 2017 is fixedly sleeved on the outside of the two columns 301, the tops of the two columns 301 extend to the outside of the recovery box 204 and are fixedly connected to the same bracket 306, the outsides of the two columns 301 are fixedly sleeved with abutment rings 3011, the two abutment rings 3011 are both located at the top of the recovery box 204, two guide columns 3012 are symmetrically fixedly connected between the recovery box 204 and the receiving hopper 203, the bracket 306 is movably sleeved on the outside of the two guide columns 3012, two vibration springs 304 are symmetrically fixedly connected between the bracket 306 and the recovery box 204, the two vibration springs 304 are respectively sleeved on the outside of the two guide columns 3012, the receiving hopper 203 A left L-shaped plate 302 is fixedly installed on the outer side of the recycling box 204, a right L-shaped plate 303 is fixedly installed on the outer side of the recycling box 204, two driven shafts 3013 are symmetrically rotatably connected between the left L-shaped plate 302 and the right L-shaped plate 303, eccentric blocks 305 are fixedly installed on the outer sides of the two driven shafts 3013, and the two eccentric blocks 305 are both located below the bracket 306, a rotating motor 309 is fixedly installed on the left L-shaped plate 302, and a driving shaft 307 located below the bracket 306 is fixedly connected to the rotating motor 309, and one end of the driving shaft 307 away from the rotating motor 309 is rotatably connected to the receiving hopper 203, a driving gear 308 is fixedly installed on the outer side of the driving shaft 307, and driven gears 3010 are fixedly installed on the outer sides of the two driven shafts 3013, and the two driven gears 3010 are meshed and connected with the driving gear 308;

[0035] First, the rotating motor 309 is started to drive the driving shaft 307 to rotate, and the driving gear 308 to rotate. Since the two driven gears 3010 are meshed and connected with the driving gear 308, the two driven shafts 3013 are driven to rotate, and the two eccentric blocks 305 are driven to rotate to hit the bracket 306. At the same time, under the action of the elastic force of the two vibration springs 304, the bracket 306 slides back and forth along the two guide columns 3012, and then the lower sieve plate 2016 and the upper sieve plate 2017 are driven to move up and down through the two columns 301 to avoid blockage of the lower sieve plate 2016 and the upper sieve plate 2017, and finally improve the screening efficiency of the unburned fuel.

[0036] Embodiment 4, on the basis of embodiment 1, the blocking mechanism 4 includes a side plate 401 located on the outside of the material box 201, a blocking plate 403 is fixedly connected to the side plate 401, the blocking plate 403 is inserted into the material box 201, the outside of the material box 201 is symmetrically fixedly connected with two positioning columns 402, the side plate 401 is sleeved on the outside of the two positioning columns 402, the bottom of the blocking plate 403 is fixedly connected with an abutment block 405, the outside of the material box 201 is fixedly connected with a side block 4010 located below the side plate 401, and the bottom of the side block 4010 is fixedly connected to the outside of the material box 201. A sliding rod 404 is fixedly connected, a slider 4011 is movably sleeved on the outer side of the sliding rod 404, a return spring 407 is fixedly connected between the slider 4011 and the side block 4010, the return spring 407 is sleeved on the outer side of the sliding rod 404, a plug plate 408 is fixedly connected to the top of the slider 4011, the plug plate 408 passes through the side block 4010 and is movably connected to the side block 4010, a slot 409 is provided at the bottom of the side plate 401, a bottom groove 406 is provided at the bottom of the blocking plate 403, the bottom groove 406 and the slot 409 are both adapted to the plug plate 408, and the plug plate 408 is inserted into the slot 409;

[0037] First, slide the slider 4011 downward along the slide rod 404. At this time, the return spring 407 is stretched, driving the plug plate 408 to descend until it moves out of the slot 409. Then pull the side plate 401 to drive the blocking plate 403 to move until the abutment block 405 is close to the side plate 401 and abuts against the inner wall of the discharge box 201. Then release the slider 4011. At this time, the return spring 407 is reset and drives the slider 4011 to slide upward along the slide rod 404, and drives the plug plate 408 to rise until it is inserted into the bottom groove 406, so that the blocking plate 403 is fixed after it moves, and finally the unburned fuel in the furnace body 1 falls for recovery.

Claims

1. A smelting furnace with a fuel recovery function, comprising a furnace body (1), characterized in that: A fuel recovery mechanism (2) is provided at the bottom of the furnace body (1), and an anti-blocking mechanism (3) and a blocking mechanism (4) are provided on the fuel recovery mechanism (2); The fuel recovery mechanism (2) comprises a feed box (201) fixed to the bottom of the furnace body (1), a receiving hopper (203) is arranged on the outside of the feed box (201), a recovery box (204) is fixedly connected to the bottom of the receiving hopper (203), a feed box (2020) is fixedly connected to the bottom of the recovery box (204), a discharge port (206) is arranged at the bottom of the feed box (2020), a sealing cover (207) is arranged on the discharge port (206), and two support shafts (202) are symmetrically rotatably connected to the outside of the feed box (201), and the ends of the two support shafts (202) away from the feed box (201) are fixed to the inner wall of the receiving hopper (203). The recycling box (204) is connected, and a lower sieve plate (2016) and an upper sieve plate (2017) are movably installed inside the recycling box (204), the lower sieve plate (2016) is located below the upper sieve plate (2017), the inner diameter value of the sieve holes on the upper sieve plate (2017) is greater than the inner diameter value of the sieve holes on the lower sieve plate (2016), and an upper discharge port (2019) and a lower discharge port (2021) are respectively provided on both sides of the recycling box (204), and an upper cover plate (2018) and a lower cover plate (208) are respectively provided on both sides of the recycling box (204), the upper cover plate (2018) corresponds to the upper discharge port (2019), and the lower cover plate (208) corresponds to the lower discharge port (2021).

2. A smelting furnace with fuel recovery function according to claim 1, characterized in that: A U-shaped rod (2012) located above the material receiving hopper (203) is fixedly connected between the material discharge box (201) and the furnace body (1); a mounting plate (2010) is movably sleeved on the outer side of the U-shaped rod (2012); two L-shaped rods (205) are symmetrically fixedly connected between the material receiving hopper (203) and the recovery box (204); a slide plate (209) is movably sleeved between the two L-shaped rods (205); and the mounting plate (2010) is rotatably connected to the slide plate (209).

3. A smelting furnace with fuel recovery function according to claim 2, characterized in that: The outer side of the U-shaped rod (2012) is fixedly sleeved with a sleeve block (2011), the outer side of the sleeve block (2011) is rotatably connected with a screw rod (2014), one end of the screw rod (2014) away from the sleeve block (2011) is fixedly connected with a drive motor (2015), the drive motor (2015) is fixed to the outer side of the discharge box (201), the outer side of the screw rod (2014) is threadedly sleeved with a screw sleeve (2013), and the mounting plate (2010) is fixed to the bottom of the screw sleeve (2013).

4. The smelting furnace with fuel recovery function according to claim 1, characterized in that: The anti-blocking mechanism (3) comprises two columns (301) symmetrically fixed to the top of the lower sieve plate (2016); the upper sieve plate (2017) is fixedly sleeved on the outer sides of the two columns (301); the top ends of the two columns (301) extend to the outer side of the recovery box (204) and are fixedly connected to the same bracket (306); the outer sides of the two columns (301) are fixedly sleeved with abutment rings (3011); the two abutment rings (3011) are both located at the top of the recovery box (204); two guide columns (3012) are symmetrically fixedly connected between the recovery box (204) and the receiving hopper (203); the bracket (306) is movably sleeved on the outer sides of the two guide columns (3012); two vibration springs (304) are symmetrically fixedly connected between the bracket (306) and the recovery box (204); the two vibration springs (304) are respectively sleeved on the outer sides of the two guide columns (3012).

5. The smelting furnace with fuel recovery function according to claim 1, characterized in that: A left L-shaped plate (302) is fixedly installed on the outer side of the receiving hopper (203), and a right L-shaped plate (303) is fixedly installed on the outer side of the recovery box (204). Two driven shafts (3013) are symmetrically rotatably connected between the left L-shaped plate (302) and the right L-shaped plate (303). Eccentric blocks (305) are fixedly installed on the outer sides of the two driven shafts (3013), and the two eccentric blocks (305) are both located below the bracket (306).

6. The smelting furnace with fuel recovery function according to claim 5, characterized in that: A rotating motor (309) is fixedly mounted on the left L-shaped plate (302), and a driving shaft (307) located below the bracket (306) is fixedly connected to the rotating motor (309), and one end of the driving shaft (307) away from the rotating motor (309) is rotationally connected to the receiving hopper (203), and a driving gear (308) is fixedly mounted on the outer side of the driving shaft (307), and driven gears (3010) are fixedly mounted on the outer sides of the two driven shafts (3013), and the two driven gears (3010) are meshingly connected with the driving gear (308).

7. The smelting furnace with fuel recovery function according to claim 1, characterized in that: The blocking mechanism (4) comprises a side plate (401) located outside the material discharge box (201), a blocking plate (403) is fixedly connected to the side plate (401), the blocking plate (403) is inserted into the material discharge box (201), two positioning columns (402) are symmetrically fixedly connected to the outside of the material discharge box (201), the side plate (401) is sleeved on the outside of the two positioning columns (402), and a contact block (405) is fixedly connected to the bottom of the blocking plate (403).

8. The smelting furnace with fuel recovery function according to claim 1, characterized in that: The outer side of the material discharge box (201) is fixedly connected to a side block (4010) located below the side plate (401); a sliding rod (404) is fixedly connected between the bottom of the side block (4010) and the outer side of the material discharge box (201); a slider (4011) is movably sleeved on the outer side of the sliding rod (404); a return spring (407) is fixedly connected between the slider (4011) and the side block (4010); the return spring (407) is sleeved on the outer side of the sliding rod (404); a plug plate (408) is fixedly connected to the top of the slider (4011); the plug plate (408) passes through the side block (4010) and is movably connected to the side block (4010).

9. The smelting furnace with fuel recovery function according to claim 7, characterized in that: The bottom of the side plate (401) is provided with a slot (409), and the bottom of the blocking plate (403) is provided with a bottom groove (406). Both the bottom groove (406) and the slot (409) are adapted to the plug board (408), and the plug board (408) is inserted into the slot (409).

Images