Metallurgical iron making furnace preheating device

Abstract

The invention discloses an iron making furnace preheating device for metallurgy, and relates to the technical field of iron making furnace preheating, an inclined panel is slidably mounted on the circumferential surface of a reciprocating screw rod, an elastic telescopic inclined plate is rotatably mounted at the bottom of the inclined panel, and a bottom plate is fixedly mounted at the bottom of a preheater; the elastic telescopic inclined plate is used for cleaning dust particles on the bottom plate, when the elastic telescopic inclined plate moves downwards, dust and impurities on the bottom plate can be cleaned, most of garbage enters the packing box, shaking generated by collision of the elastic telescopic inclined plate and the inclined surface block can reduce residues of the impurities on the inclined surface plate and the elastic telescopic inclined plate, and the packing box is convenient to use. And impurities on the sieve plate can be quickly cleaned, the influence on subsequent ironmaking caused by repeated replacement of the sieve plate is avoided, and the internal space of the packing box can be better utilized after the bottom plate collides with the elastic telescopic inclined plate.

Description

Technical Field

[0001] This invention relates to the field of blast furnace preheating technology, specifically to a blast furnace preheating device for metallurgy. Background Technology

[0002] The preheating device for metallurgical ironmaking furnaces is an auxiliary device used in metallurgical ironmaking scenarios. Its core function is to preheat the air and then deliver the preheated air into the ironmaking equipment. It is also equipped with auxiliary mechanisms such as cleaning, collection, and compression, which can realize the cleaning and collection of impurities inside the equipment and optimize the use of space, ensuring the stable and efficient operation of the ironmaking process.

[0003] Patent publication number CN109971904B includes an ironmaking furnace. A preheating box is fixedly installed at the bottom of the front side of the ironmaking furnace, and the furnace's exhaust pipe passes through the preheating box and extends into its inner cavity. An exhaust pipe is installed through the top of the preheating box, and a control valve is installed on the exhaust pipe. An air inlet pipe is installed through one side of the preheating box, and an air inlet box is fixedly installed inside the preheating box with bolts. One end of the air inlet pipe passes through the air inlet box and extends into its inner cavity. This patent, by setting up a preheating box and connecting its inner cavity with the inner cavity of the ironmaking furnace, and by setting up an exhaust pipe and a pressure control valve, allows the high-temperature hot air in the ironmaking furnace to be discharged into the interior of the preheating box. Furthermore, through the cooperation of the air inlet box, the heating pipe exhaust box, and the exhaust pipe, the air entering the ironmaking furnace through the preheating box is preheated, thereby achieving the effects of waste heat utilization, energy saving, and environmental protection.

[0004] In the aforementioned patent, the high-temperature hot air in the blast furnace is discharged into the preheating box. Through the cooperation of the air inlet box, heating pipe exhaust box and exhaust pipe, the air entering the blast furnace through the preheating box is preheated, thereby achieving waste heat utilization. However, there are still problems. It is not possible to effectively and quickly clean the heated air, and it is difficult to ensure that the subsequent air will not interfere with the preheater. It is also difficult to ensure the effectiveness of collecting impurities filtered from the air. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a preheating device for a metallurgical blast furnace, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a preheating device for a metallurgical blast furnace, comprising a blast furnace device and a motor, and a cleaning device for rapidly cleaning the interior of the preheating device, comprising a cleaning device, the cleaning device further comprising; The pipeline has one end fixedly installed on the circumferential surface of the ironmaking device, and the other end of the pipeline is fixedly installed with a preheater; A sieve plate is slidably installed inside the preheater. A reciprocating screw is fixedly installed at the output end of the motor. An inclined plate is slidably installed on the circumferential surface of the reciprocating screw. An elastic telescopic inclined plate is rotatably installed at the bottom of the inclined plate. A base plate is fixedly installed at the bottom of the preheater. The elastic telescopic inclined plate is used to clean dust particles on the base plate. When the elastic telescopic inclined plate moves, its elasticity allows it to always fit in contact with the base plate. When the elastic telescopic inclined plate moves downward, it will press the inclined block on the base plate downward.

[0007] According to the above technical solution, the cleaning device further includes an inclined block and a box. The inclined block is slidably installed on the top of the base plate, and the box is slidably installed on the bottom of the base plate. The inclined block will move upward due to the action of the No. 1 spring. When the elastic telescopic inclined plate moves downward, it will clean the dust and impurities on the base plate, allowing most of the garbage to enter the interior of the box.

[0008] According to the above technical solution, a No. 1 spring is provided between the base plate and the inclined block, and the elastic telescopic inclined plate is in contact with the inclined block; The preheater is equipped with a collection device on the front for quickly collecting dust and particles accumulated on the back of the elastic telescopic inclined plate and a compression device for increasing the amount collected. The elastic telescopic inclined plate flips when it comes into contact with the inclined block, but falls off when it leaves the inclined block, so that the collision between the elastic telescopic inclined plate and the bottom plate becomes a force that shakes the elastic telescopic inclined plate and the inclined plate.

[0009] According to the above technical solution, the collecting device includes a rotating plate, an elastic telescopic push plate, a square plate, a long rod, and a trapezoidal box. The rotating plate is rotatably installed on the front of the preheater. The elastic telescopic push plate is fixedly installed on the free end of the elastic telescopic inclined plate near the rotating plate. One end of the square plate slides through the front of the preheater. One end of the long rod is fixedly installed at the bottom of the other end of the square plate. The trapezoidal box is fixedly installed at the other end of the long rod. When the inclined plate contacts the square plate, the square plate will move. When the square plate moves, it will drive the long rod to move. When the long rod moves, it will drive the trapezoidal box to move. When the trapezoidal box moves, it will drive the inclined plate to move.

[0010] According to the above technical solution, the collection device also includes a U-rod, a replacement box, and a slope panel. One end of the U-rod is fixedly installed on the left side of the trapezoidal box, the replacement box is slidably installed on the other end of the U-rod, and the slope panel is fixedly installed on the bottom of the inner wall of the trapezoidal box. When the slope panel moves back and forth, the blocky impurities falling on the slope panel will fall into the replacement box. At the same time, when the slope panel moves, it will drive the elastic telescopic slope plate to move.

[0011] According to the above technical solution, the elastic telescopic push plate contacts the rotating plate, and a spring is provided between the rotating plate and the preheater. When the elastic telescopic push plate contacts the rotating plate, the rotating plate will flip. When the rotating plate flips, the impurities that are compacted between the elastic telescopic push plate and the preheater will be released.

[0012] According to the above technical solution, the compression device includes a connecting plate, a triangular block, an elastic telescopic inclined block, a pressure block, an L-plate, a baffle, a limiting block, and a telescopic driving block. One end of the connecting plate is fixedly installed on the front of the preheater, and the triangular block is fixedly installed on the other end of the connecting plate. The pressure block is slidably installed on the inner wall of the trapezoidal box. The fixed end of the elastic telescopic inclined block is fixedly installed on the top of the pressure block. The L-plate is fixedly installed on the free end of the elastic telescopic inclined block. The baffle is slidably installed on the inner wall of the trapezoidal box. The limiting block is slidably installed on the inner wall of the trapezoidal box. The fixed end of the telescopic driving block is fixedly installed on the side of the limiting block near the elastic telescopic inclined block. The free end of the telescopic driving block is fixedly connected to the elastic telescopic inclined block. When the elastic telescopic inclined block moves downward, it will drive the pressure block to move downward. When the pressure block moves downward, it will squeeze the clumps of impurities inside the replacement box.

[0013] According to the above technical solution, the baffle is in contact with the limiting block, the L-plate is in contact with the limiting block, and the elastic telescopic inclined block is in contact with the triangular block. When the telescopic block cannot move, the free end of the elastic telescopic inclined block can move. When the free end of the elastic telescopic inclined block moves, it will drive the L-plate to move.

[0014] This invention provides a preheating device for a metallurgical blast furnace. It has the following beneficial effects: (1) In this invention, when the elastic telescopic inclined plate moves downward, it can clean the dust and impurities on the bottom plate, allowing most of the garbage to enter the box. The vibration generated by the collision between the elastic telescopic inclined plate and the inclined block can reduce the residue of impurities on the inclined plate and the elastic telescopic inclined plate, and can quickly clean the impurities on the screen plate, avoiding the impact of multiple replacements of the screen plate on subsequent iron smelting. Furthermore, after the bottom plate collides with the elastic telescopic inclined plate, the space inside the box will be better utilized.

[0015] (2) In this invention, after the internal space of the replacement box is full, it can be directly removed from the U rod. The operation is simple and efficient. The blocky impurities fall into the replacement box by moving the slope panel back and forth. On the other hand, the impurities that are compacted between the elastic telescopic inclined plate and the preheater are released by the rotating plate, so that they fall into the trapezoidal box and then enter the replacement box. This achieves multi-path impurity collection and can also save the staff from cleaning the slope panel when shaking.

[0016] (3) In this invention, when the replacement box space is full, the baffle automatically moves downward to restrict the material pushing of the slope panel, so as to avoid the overflow of impurities or equipment failure caused by continued feeding. The pressure block can squeeze the block impurities in the replacement box to maximize the use of the internal space of the replacement box. It can also squeeze the block impurities in the replacement box a second time, so that the staff can quickly take out and transport the impurities, which is convenient for subsequent placement and saves placement space. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the pipeline and preheater structure of the present invention; Figure 3 This is a schematic diagram of the elastic telescopic inclined plate and inclined block structure of the present invention; Figure 4 This is a schematic diagram of the reciprocating screw rod and inclined block structure of the present invention; Figure 5 This is a schematic diagram of the elastic telescopic inclined plate and rotating plate structure of the present invention; Figure 6 This is a schematic diagram of the slope panel and pressure block structure of the present invention; Figure 7 This is a schematic diagram of the pressure block and limiting block structure of the present invention.

[0018] In the diagram: 1. Ironmaking equipment; 2. Pipeline; 3. Preheater; 401. Reciprocating screw; 402. Inclined plate; 403. Elastic telescopic inclined plate; 404. Base plate; 405. Inclined block; 406. Box; 407. Screen plate; 501. Rotating plate; 502. Elastic telescopic push plate; 503. Square plate; 504. Long rod; 505. Trapezoidal box; 506. U-rod; 507. Replacement box; 508. Sloping plate; 601. Connecting plate; 602. Triangular block; 603. Elastic telescopic inclined block; 604. Pressure block; 605. L-plate; 606. Baffle; 607. Limiting block; 608. Telescopic drive block. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-7 One embodiment of the present invention is: a preheating device for a metallurgical ironmaking furnace, comprising an ironmaking device 1 and a motor, and a cleaning device for rapidly cleaning the interior of the preheating device, comprising the cleaning device and further comprising; Pipeline 2, one end of which is fixedly installed on the circumferential surface of the ironmaking device 1, and a preheater 3 is fixedly installed at the other end of the pipeline 2; The sieve plate 407 is slidably installed inside the preheater 3. A reciprocating screw rod 401 is fixedly installed at the output end of the motor. An inclined plate 402 is slidably installed on the circumferential surface of the reciprocating screw rod 401. An elastic telescopic inclined plate 403 is rotatably installed at the bottom of the inclined plate 402. A base plate 404 is fixedly installed at the bottom of the preheater 3. The elastic telescopic inclined plate 403 is used to clean the dust particles on the base plate 404. It can quickly clean the impurities on the sieve plate 407, avoiding the impact of multiple replacements of the sieve plate 407 on subsequent ironmaking. Furthermore, after the base plate 404 collides with the elastic telescopic inclined plate 403, the internal space of the box 406 will be better utilized.

[0021] The cleaning device also includes a ramp block 405 and a box 406. The ramp block 405 is slidably mounted on the top of the base plate 404, and the box 406 is slidably mounted on the bottom of the base plate 404. The ramp block 405 will move upward due to the action of the first spring. When the elastic telescopic ramp 403 moves downward, it will clean the dust and impurities on the base plate 404, allowing most of the garbage to enter the interior of the box 406.

[0022] A spring is provided between the base plate 404 and the inclined block 405. The elastic telescopic inclined plate 403 contacts the inclined block 405. The elastic telescopic inclined plate 403 flips when it contacts the inclined block 405, but falls off when it leaves the inclined block 405. This causes the collision between the elastic telescopic inclined plate 403 and the base plate 404 to create a force that shakes the elastic telescopic inclined plate 403 and the inclined plate 402.

[0023] In this embodiment, when the ironmaking device 1 is ready, the operator starts the preheater 3. When the preheater 3 is started, it preheats the air, so that the preheated air enters the inner wall of the ironmaking device 1 through the pipe 2. The motor is started, and when the motor starts, it drives the reciprocating screw 401 to rotate. When the reciprocating screw 401 rotates, it drives the inclined plate 402 to move. When the inclined plate 402 moves, it drives the elastic telescopic inclined plate 403 to move. When the elastic telescopic ramp 403 moves, its elasticity allows it to remain in contact with the base plate 404. When the ramp 403 moves downward, it presses the ramp block 405 on the base plate 404 downward. When the ramp 403 moves away from the ramp block 405, the ramp block 405 moves upward due to the action of the first spring. When the ramp 403 moves downward, it cleans the dust and impurities on the base plate 404, allowing most of the waste to enter the box 406. When the ramp 403 moves upward, it comes into contact with the ramp block 405. However, since the elastic telescopic inclined plate 403 and the inclined plate 402 are rotatably connected, when the elastic telescopic inclined plate 403 moves upward, it will directly collide with the inclined block 405. This causes the elastic telescopic inclined plate 403 to flip when it contacts the inclined block 405, but it will fall off when it leaves the inclined block 405. This causes the collision between the elastic telescopic inclined plate 403 and the base plate 404 to create a shaking force on the elastic telescopic inclined plate 403 and the inclined plate 402, reducing the residue of impurities on the inclined plate 402 and the elastic telescopic inclined plate 403. When there are too many impurities on the sieve plate 407, the workers can directly pull out the sieve plate 407.

[0024] Please see Figures 1-7 Based on the above embodiments, in another embodiment of the present invention, the front of the preheater 3 is provided with a collection device for quickly collecting dust and particles accumulated on the back of the elastic telescopic inclined plate 403 and a compression device for increasing the amount collected. The collection device includes a rotating plate 501, an elastic telescopic push plate 502, a square plate 503, a long rod 504 and a trapezoidal box 505. The rotating plate 501 is rotatably mounted on the front of the preheater 3, and the elastic telescopic push plate 502 is fixedly mounted on the free end of the elastic telescopic inclined plate 403. On the side near the rotating plate 501, one end of the square plate 503 slides through the front of the preheater 3. One end of the long rod 504 is fixedly installed at the bottom of the other end of the square plate 503, and the trapezoidal box 505 is fixedly installed at the other end of the long rod 504. By rotating the plate 501, the impurities that are compacted between the elastic telescopic inclined plate 403 and the preheater 3 are released and fall into the trapezoidal box 505 and then enter the replacement box 507, realizing the collection of impurities through multiple pathways. It can also save the staff from cleaning the slope plate 508 when shaking.

[0025] The collection device also includes a U-rod 506, a replacement box 507, and a ramp 508. One end of the U-rod 506 is fixedly installed on the left side of the trapezoidal box 505, and the replacement box 507 is slidably installed on the other end of the U-rod 506. The ramp 508 is fixedly installed on the bottom of the inner wall of the trapezoidal box 505. When the ramp 508 moves back and forth, the blocky impurities falling on the ramp 508 will fall into the replacement box 507. At the same time, when the ramp 402 moves, it will drive the elastic telescopic ramp 403 to move.

[0026] The elastic telescopic push plate 502 contacts the rotating plate 501. A spring is provided between the rotating plate 501 and the preheater 3. When the elastic telescopic push plate 502 contacts the rotating plate 501, the rotating plate 501 will flip. When the rotating plate 501 flips, the impurities that are compacted between the elastic telescopic inclined plate 403 and the preheater 3 will be released.

[0027] The compression device includes a connecting plate 601, a triangular block 602, an elastic telescopic inclined block 603, a pressure block 604, an L-plate 605, a baffle 606, a limiting block 607, and a telescopic driving block 608. One end of the connecting plate 601 is fixedly installed on the front of the preheater 3, the triangular block 602 is fixedly installed on the other end of the connecting plate 601, the pressure block 604 is slidably installed on the inner wall of the trapezoidal box 505, the fixed end of the elastic telescopic inclined block 603 is fixedly installed on the top of the pressure block 604, the L-plate 605 is fixedly installed on the free end of the elastic telescopic inclined block 603, and the baffle 606 is slidably installed on the trapezoidal box 505. The inner wall of the trapezoidal box 505 has a limiting block 607 that slides on the inner wall. The fixed end of the telescopic driving block 608 is fixedly installed on the side of the limiting block 607 near the elastic telescopic inclined block 603. The free end of the telescopic driving block 608 is fixedly connected to the elastic telescopic inclined block 603. The pressing block 604 can squeeze the lumps of impurities in the replacement box 507 to maximize the use of the internal space of the replacement box 507. It can also squeeze the lumps of impurities in the replacement box 507 a second time, so that the staff can quickly take out and transport the impurities, which is convenient for subsequent placement and saves placement space.

[0028] The baffle 606 is in contact with the limiting block 607, the L plate 605 is in contact with the limiting block 607, and the elastic telescopic inclined block 603 is in contact with the triangular block 602. When the telescopic driving block 608 cannot move, the free end of the elastic telescopic inclined block 603 can move. When the free end of the elastic telescopic inclined block 603 moves, it will drive the L plate 605 to move.

[0029] In this embodiment, when the inclined panel 402 moves, it will come into contact with the square plate 503. When the inclined panel 402 comes into contact with the square plate 503, the square plate 503 will move. When the square plate 503 moves, it will drive the long rod 504 to move. When the long rod 504 moves, it will drive the trapezoidal box 505 to move. When the trapezoidal box 505 moves, it will drive the slope panel 508 to move. When the slope panel 508 moves back and forth, the blocky impurities that fall on the slope panel 508 will fall into the replacement box 507. At the same time, when the inclined panel 402 moves, it will drive the elastic telescopic inclined plate 403 to move. When the elastic telescopic inclined plate 403 moves, it will drive the elastic telescopic push plate 502 to move. When the elastic telescopic push plate 502 moves, it will contact the rotating plate 501. When the elastic telescopic push plate 502 contacts the rotating plate 501, it will cause the rotating plate 501 to flip. When the rotating plate 501 is flipped, the impurities that are compacted between the elastic telescopic inclined plate 403 and the preheater 3 are released, allowing the impurities to fall into the trapezoidal box 505 and then into the replacement box 507. When the internal space of the replacement box 507 is full, the replacement box 507 can be directly removed from the U-rod 506, which is simple and convenient.

[0030] When the trapezoidal box 505 moves, it will drive the pressure block 604 to move. When the pressure block 604 moves, it will drive the elastic telescopic inclined block 603 to move. When the elastic telescopic inclined block 603 moves, it will contact the triangular block 602 on the connecting plate 601. When the triangular block 602 contacts the elastic telescopic inclined block 603, it will cause the elastic telescopic inclined block 603 to move downward. When the elastic telescopic inclined block 603 moves downward, it will drive the pressure block 604 to move downward. When the pressure block 604 moves downward, it will squeeze the clumps of impurities inside the replacement box 507, thereby maximizing the use of the usable space inside the replacement box 507. When the space inside the replacement box 507 is full, the pressure block 604 can no longer move downward. When the pressure block 604 can no longer move downward, the limiting block 607 on the telescopic driving block 608 can also not move. When the telescopic driving block 608 cannot move, the free end of the elastic telescopic inclined block 603 can move. When the free end of the elastic telescopic inclined block 603 moves, it will drive the L plate 605 to move. When the L plate 605 moves, it will drive the limiting block 607 to move. When the limiting block 607 moves, it will release the limiting of the baffle 606. When the limiting of the baffle 606 is released, the baffle 606 will move downward. When the baffle 606 moves downward, it will restrict the direction of the slope panel 508 inside the trapezoidal box 505 to prevent the material from being pushed downward.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A preheating device for a metallurgical blast furnace, comprising a blast furnace apparatus (1) and a motor, characterized in that: A cleaning device for rapidly cleaning the interior of a preheating unit, comprising a cleaning device, the cleaning device further comprising; Pipe (2), one end of which is fixedly installed on the circumferential surface of the ironmaking device (1), and the other end of which is fixedly installed with a preheater (3). A sieve plate (407) is slidably installed inside the preheater (3). A reciprocating screw rod (401) is fixedly installed at the output end of the motor. An inclined plate (402) is slidably installed on the circumferential surface of the reciprocating screw rod (401). An elastic telescopic inclined plate (403) is rotatably installed at the bottom of the inclined plate (402). A base plate (404) is fixedly installed at the bottom of the preheater (3). The elastic telescopic inclined plate (403) is used to clean dust particles on the base plate (404).

2. The metallurgical blast furnace preheating device according to claim 1, characterized in that: The cleaning device also includes a ramp block (405) and a box (406), the ramp block (405) being slidably mounted on the top of the base plate (404) and the box (406) being slidably mounted on the bottom of the base plate (404).

3. The metallurgical blast furnace preheating device according to claim 2, characterized in that: A first spring is provided between the base plate (404) and the inclined block (405), and the elastic telescopic inclined plate (403) is in contact with the inclined block (405); The preheater (3) is provided with a collection device for quickly collecting the dust and particles accumulated on the back of the elastic telescopic inclined plate (403) and a compression device for increasing the amount collected.

4. The metallurgical blast furnace preheating device according to claim 3, characterized in that: The collecting device includes a rotating plate (501), an elastic telescopic push plate (502), a square plate (503), a long rod (504), and a trapezoidal box (505). The rotating plate (501) is rotatably mounted on the front of the preheater (3). The elastic telescopic push plate (502) is fixedly mounted on the side of the free end of the elastic telescopic inclined plate (403) near the rotating plate (501). One end of the square plate (503) slides through the front of the preheater (3). One end of the long rod (504) is fixedly mounted on the bottom of the other end of the square plate (503). The trapezoidal box (505) is fixedly mounted on the other end of the long rod (504).

5. A preheating device for a metallurgical blast furnace according to claim 4, characterized in that: The collection device also includes a U-rod (506), a replacement box (507), and a slope panel (508). One end of the U-rod (506) is fixedly installed on the left side of the trapezoidal box (505), the replacement box (507) is slidably installed on the other end of the U-rod (506), and the slope panel (508) is fixedly installed on the bottom of the inner wall of the trapezoidal box (505).

6. The metallurgical blast furnace preheating device according to claim 5, characterized in that: The elastic telescopic push plate (502) contacts the rotating plate (501), and a spring is provided between the rotating plate (501) and the preheater (3).

7. A preheating device for a metallurgical blast furnace according to claim 6, characterized in that: The compression device includes a connecting plate (601), a triangular block (602), an elastic telescopic inclined block (603), a pressure block (604), an L-plate (605), a baffle (606), a limiting block (607), and a telescopic driving block (608). One end of the connecting plate (601) is fixedly installed on the front of the preheater (3), the triangular block (602) is fixedly installed on the other end of the connecting plate (601), the pressure block (604) is slidably installed on the inner wall of the trapezoidal box (505), and the fixed end of the elastic telescopic inclined block (603) is... The L-plate (605) is fixedly installed on the top of the pressure block (604), the L-plate (605) is fixedly installed on the free end of the elastic telescopic inclined block (603), the baffle (606) is slidably installed on the inner wall of the trapezoidal box (505), the limiting block (607) is slidably installed on the inner wall of the trapezoidal box (505), the fixed end of the telescopic driving block (608) is fixedly installed on the side of the limiting block (607) near the elastic telescopic inclined block (603), and the free end of the telescopic driving block (608) is fixedly connected to the elastic telescopic inclined block (603).

8. A preheating device for a metallurgical blast furnace according to claim 7, characterized in that: The baffle (606) is in contact with the limiting block (607), the L plate (605) is in contact with the limiting block (607), and the elastic telescopic inclined block (603) is in contact with the triangular block (602).

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