Integrated ignition gun and torpedo ladle baking apparatus

Abstract

The present invention relates to the technical field of torpedo ladle baking. Disclosed are an integrated ignition gun and a torpedo ladle baking apparatus. The integrated ignition gun comprises a coal gas pipe, and ignition holes are formed in the coal gas pipe. The integrated ignition gun further comprises a fixing partition assembly, insulating sleeves, voltage guide rods, and an ignition power supply. The insulating sleeves are fixed to the coal gas pipe by means of the fixing partition assembly. The voltage guide rods are sleeved in the insulating sleeves. Each voltage guide rod has one end connected to the ignition power supply, and the other end arranged on one side of the corresponding ignition hole. The torpedo ladle baking apparatus comprises the integrated ignition gun. According to the present invention, automatic ignition is achieved, the apparatus is safer and more reliable, the problem of a conventional ignition apparatus being unable to be used under extreme working conditions such as high temperature in a torpedo ladle is solved, and the apparatus is convenient to use and easy to assemble / disassemble.

Description

An integrated ignition gun and torpedo can baking device Technical Field

[0001] The present invention relates to the technical field of torpedo can baking, in particular to an integrated ignition gun and a torpedo can baking device. Background Art

[0002] The torpedo jar baking devices used in various steel mills all rely on manual torch ignition, posing a safety hazard. Manual ignition is used because the burner typically extends a long distance into the torpedo jar during baking, reaching up to three meters. During the baking process, the internal temperature of the torpedo jar is extremely high, reaching a final baking temperature of 950°C. Conventional ignition devices are incapable of operating under these conditions.

[0003] Therefore, it is necessary to design a new ignition gun structure that can overcome the problem that conventional ignition devices cannot be used in the high-temperature environment after baking in the torpedo tank. Summary of the Invention

[0004] In view of the above-mentioned shortcomings, the present invention provides an integrated ignition gun and torpedo tank baking device, which can automatically ignite, is safer and more reliable, overcomes the problem that conventional ignition devices cannot be used under extreme working conditions such as high temperature inside the torpedo tank, and is easy to use and easy to disassemble and assemble.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] An integrated ignition gun includes a gas pipe with an ignition hole provided on the gas pipe. The integrated ignition gun also includes a fixed partition assembly, an insulating sleeve, a pressure guide rod, and an ignition power supply. The insulating sleeve is fixed to the gas pipe through the fixed partition assembly. The pressure guide rod is sleeved in the insulating sleeve. One end of the pressure guide rod is connected to the ignition power supply, and the other end is arranged on one side of the ignition hole.

[0007] According to one aspect of the present invention, the gas pipe includes a main pipe section and a secondary pipe section, which are vertically connected, and the ignition holes are provided at both ends of the secondary pipe section.

[0008] According to one aspect of the present invention, the fixed partition assembly includes a first ceramic partition and a second ceramic partition. The first ceramic partition is connected to the auxiliary pipe section and the insulating sleeve respectively, and the second ceramic partition is connected to the main pipe section and the insulating sleeve respectively.

[0009] According to one aspect of the present invention, the gas pipe is T-shaped, and the insulating sleeve and the pressure-guiding rod are both arranged on the periphery of the gas pipe, and the insulating sleeve and the pressure-guiding rod are both L-shaped.

[0010] According to one aspect of the present invention, the ignition power supply includes an ignition electrode and an ignition transformer, which are connected to each other, and the ignition electrode is connected to a pressure-conducting rod.

[0011] According to one aspect of the present invention, it further includes a sensing detection system, which is connected to the pressure-guiding rod.

[0012] According to one aspect of the present invention, the fixed partition assembly and the insulating sleeve are made of any one of corundum and alumina ceramics.

[0013] According to one aspect of the present invention, the pressure-guiding rod is made of Cr28Ni48W5 and has a diameter of 6 mm. The inner diameter of the insulating sleeve is 6.3 mm. The gas pipe is made of a DN25 stainless steel pipe.

[0014] According to one aspect of the present invention, the diameter of the ignition holes is 4.5 mm, and the total number of the ignition holes is 96.

[0015] A torpedo can baking device comprises a torpedo can and the above-mentioned integrated ignition gun arranged on the torpedo can.

[0016] The advantages of the present invention are as follows: ignition gas is delivered to the ignition hole through a gas pipe, overflows through the ignition hole to the end of the pressure rod, and the ignition power supply generates sparks between the end of the pressure rod and the ignition hole, which ignites the gas in the ignition hole area. This means that the ignition gun does not require manual ignition with a torch and can automatically ignite, making it safer and more reliable. By integrating the ignition gun into the burner air line of a torpedo tank baking device and using a high-temperature resistant hard pressure rod and an insulating sleeve for isolation and protection, the device overcomes the problem of conventional high-voltage ignition cables being unable to operate for long periods of time in environments exceeding 75°C, and overcomes the problem of conventional ignition devices being unusable under extreme operating conditions such as the high temperatures inside a torpedo tank. By connecting the pressure rod to a sensor detection system, the pressure rod also serves as an ion flame detection sensor element. The unidirectional conductivity principle of flame is utilized to detect the current signal generated by the pressure rod in real time, thereby confirming the flame status of the ignition gun. This device can detect the presence or absence of flame in real time. The overall structure of the device is simple, easy to assemble and disassemble, and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] FIG1 is a schematic structural diagram of the integrated ignition gun according to the present invention.

[0019] The names corresponding to the serial numbers in the figure are as follows:

[0020] 1. Gas pipe; 11. Main pipe section; 12. Auxiliary pipe section; 2. Ignition hole; 3. Insulating sleeve; 4. Pressure guide rod; 5. Ignition electrode; 6. First ceramic partition; 7. Second ceramic partition. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention. Example 1

[0022] As shown in Figure 1, an integrated ignition gun is integrally built into the burner air line of a torpedo can baking device. The ignition gun comprises a gas pipe 1, an ignition hole 2, a fixed baffle assembly, an insulating sleeve 3, a pressure guide rod 4, and an ignition power supply. The gas pipe 1 is made of DN25 stainless steel and is used to transport the long-fire gas medium. It is T-shaped and consists of a main pipe section 11 and a secondary pipe section 12, which are arranged vertically in an integrated manner. The ignition holes 2 are ignition holes located at both ends of the secondary pipe section 12, with a diameter of 4.5 mm. There are 96 of them in total, which are used to ignite the gas and create ignition conditions. The fixed baffle assembly includes a first ceramic baffle 6 and a second ceramic baffle 7, both made of corundum and in a number of quantities. They are used to securely mount the pressure guide rod 4 and isolate it from the gas pipe 1. The first ceramic baffle 6 is connected to the secondary pipe section 12 and the insulating sleeve 3, respectively, while the second ceramic baffle 7 is connected to the main pipe section 11 and the insulating sleeve 3, respectively. The insulating sleeve 3 is fixed to the gas pipe 1 via a fixed partition assembly. The insulating sleeve 3 is used to insulate the pressure-guiding rod 4 from metal bodies such as the gas pipe 1. The insulating sleeve 3 is made of corundum, has an inner diameter of Φ6.3, and is sheathed on the pressure-guiding rod 4. The insulating sleeve 3 includes a main sleeve section and a secondary sleeve section, which are vertically connected. The secondary sleeve section is connected to the secondary pipe section 12 via a first ceramic partition 6, and the main sleeve section is connected to the main pipe section 11 via a second ceramic partition 7. The pressure-guiding rod 4 is used to guide the pressure of the 6KV ignition power supply and is made of 1800°C heat-resistant high-temperature hard alloy steel. The pressure-guiding rod 4 is a Φ6, Cr28Ni48W5 high-temperature resistant alloy steel rod, which is sheathed in the insulating sleeve 3 and fixed to the ignition gas pipe 1 via the external insulating sleeve 3 and the fixed partition assembly. One end of the pressure-guiding rod 4 is connected to the ignition power supply, and the other end of the pressure-guiding rod 4 extends out of the insulating sleeve 3 and faces the side of the ignition hole 2. The ignition power supply includes an ignition electrode 5 and an ignition transformer, which are connected to provide an ignition spark. The ignition electrode 5 is connected to the pressure rod 4. The ignition electrode 5 receives the 6KV ignition voltage signal from the ignition transformer to generate a spark between the end of the pressure rod 4 and the ignition hole 2. The spark ignites the gas in the area of ​​the ignition hole 2.

[0023] In this embodiment, there are two sets of insulating sleeves 3 and pressure-guiding rods 4, both symmetrically arranged on both sides of the periphery of the gas pipe 1; the insulating sleeves 3 and pressure-guiding rods 4 are both L-shaped, and their structural shapes are adapted to the structural shape of the gas pipe 1.

[0024] In this embodiment, the end of the pressure-guiding rod 4 is processed with an external thread, which is connected to the ignition electrode 5 by a threaded connection method. In this way, it is easy to disassemble and use.

[0025] In this embodiment, the ignition gun device is entirely built into the burner air duct of the torpedo tank baking device. Under normal circumstances, the temperature in the air duct is lower than the baking atmosphere temperature inside the torpedo tank due to the continuous flow of external air. The ignition gun device is designed to have a heat resistance temperature that is more than twice the burner air duct temperature, thereby effectively enabling the ignition gun device to work stably for a long time.

[0026] The beneficial effects of this embodiment are as follows: by providing a pressure-guiding rod 4, an ignition power supply, etc., the device can realize automatic ignition, and can avoid safety accidents caused by manual ignition in the gas area, as well as safety hazards such as flameout during baking; by integrating the ignition gun into the burner air pipeline of the torpedo tank baking device, and by adopting a high-temperature resistant hard pressure-guiding rod 4 and providing an insulating sleeve 3 for isolation and protection, the device can overcome the problem that conventional high-voltage ignition cables cannot operate for a long time in an environment exceeding 75°C, and overcome the problem that conventional ignition devices cannot be used under extreme working conditions such as high temperature inside a torpedo tank. Example 2

[0027] As shown in Figure 1, an integrated ignition gun is integrally built into the burner air line of a torpedo can baking device. The ignition gun comprises a gas pipe 1, an ignition hole 2, a fixed baffle assembly, an insulating sleeve 3, a pressure guide rod 4, and an ignition power supply. The gas pipe 1 is made of DN25 stainless steel and is used to transport the long-fire gas medium. It is T-shaped and consists of a main pipe section 11 and a secondary pipe section 12, which are arranged vertically in an integrated manner. The ignition holes 2 are ignition holes located at both ends of the secondary pipe section 12, with a diameter of 4.5 mm. There are 96 of them in total, which are used to ignite the gas and create ignition conditions. The fixed baffle assembly includes a first ceramic baffle 3 6 and a second ceramic baffle 7, both made of corundum and in a number of quantities. They are used to securely mount the pressure guide rod 4 and isolate it from the gas pipe 1. The first ceramic baffle 6 is connected to the secondary pipe section 12 and the insulating sleeve 3, respectively, while the second ceramic baffle 7 is connected to the main pipe section 11 and the insulating sleeve 3, respectively. The insulating sleeve 3 is fixed to the gas pipe 1 via a fixed partition assembly. The insulating sleeve 3 is used to insulate the pressure-guiding rod 4 from metal bodies such as the gas pipe 1. The insulating sleeve 3 is made of corundum, has an inner diameter of Φ6.3, and is sheathed on the pressure-guiding rod 4. The insulating sleeve 3 includes a main sleeve section and a secondary sleeve section, which are vertically connected. The secondary sleeve section is connected to the secondary pipe section 12 via a first ceramic partition 6, and the main sleeve section is connected to the main pipe section 11 via a second ceramic partition 7. The pressure-guiding rod 4 is used to guide the pressure of the 6KV ignition power supply and is made of 1800°C heat-resistant high-temperature hard alloy steel. The pressure-guiding rod 4 is a Φ6, Cr28Ni48W5 high-temperature resistant alloy steel rod, which is sheathed in the insulating sleeve 3 and fixed to the ignition gas pipe 1 via the external insulating sleeve 3 and the fixed partition assembly. One end of the pressure-guiding rod 4 is connected to the ignition power supply, and the other end of the pressure-guiding rod 4 extends out of the insulating sleeve 3 and faces the side of the ignition hole 2. The ignition power supply includes an ignition electrode 5 and an ignition transformer, which are connected to provide an ignition spark. The ignition electrode 5 is connected to the pressure rod 4. The ignition electrode 5 receives the 6KV ignition voltage signal from the ignition transformer to generate a spark between the end of the pressure rod 4 and the ignition hole 2. The spark ignites the gas in the area of ​​the ignition hole 2.

[0028] In this embodiment, there are two sets of insulating sleeves 3 and pressure-guiding rods 4, both symmetrically arranged on both sides of the periphery of the gas pipe 1; the insulating sleeves 3 and pressure-guiding rods 4 are both L-shaped, and their structural shapes are adapted to the structural shape of the gas pipe 1.

[0029] In this embodiment, the end of the pressure-guiding rod 4 is processed with an external thread, which is connected to the ignition electrode 5 by a threaded connection method. In this way, it is easy to disassemble and use.

[0030] In this embodiment, the ignition gun device is entirely built into the burner air duct of the torpedo tank baking device. Under normal circumstances, the temperature in the air duct is lower than the baking atmosphere temperature inside the torpedo tank due to the continuous flow of external air. The ignition gun device is designed to have a heat resistance temperature that is more than twice the burner air duct temperature, thereby effectively enabling the ignition gun device to work stably for a long time.

[0031] In this embodiment, the entire device may also include a sensing detection system connected to the pressure-conducting rod 4. The sensing detection system may be composed of a control device, a display, etc. In this case, the pressure-conducting rod 4 can be used as an ion flame detection sensor element. By utilizing the unidirectional conductivity principle of flame, the current signal generated by the ignition rod, i.e., the pressure-conducting rod 4, is detected in real time, thereby confirming the flame status of the ignition gun. In this way, the device can also detect the presence of flame in real time, making it more convenient to use.

[0032] The beneficial effects of this embodiment are as follows: by providing a pressure-guiding rod 4, an ignition power supply, etc., the device can realize automatic ignition, can avoid safety accidents caused by manual ignition in the gas area, and safety hazards such as flameout during baking; by building the ignition gun into the burner air pipeline of the torpedo tank baking device, and by adopting a high-temperature resistant hard pressure-guiding rod 4 and providing an insulating sleeve 3 for isolation and protection, the device can overcome the problem that conventional high-voltage ignition cables cannot operate for a long time in an environment exceeding 75°C, and overcome the problem that conventional ignition devices cannot be used under extreme working conditions such as high temperature in a torpedo tank; by providing a pressure-guiding rod 4 and a sensor detection system, the device can detect the burning condition of the flame in real time, etc. Example 3

[0033] As shown in Figure 1, an integrated ignition gun is integrally built into the burner air line of a torpedo can baking device. The ignition gun comprises a gas pipe 1, an ignition hole 2, a fixed baffle assembly, an insulating sleeve 3, a pressure guide rod 4, and an ignition power supply. The gas pipe 1 is made of DN25 stainless steel pipe and is used to transport the long-fire gas medium. It consists of a main pipe section 11 and a secondary pipe section 12, which are arranged vertically in an integrated manner. The ignition holes 2 are ignition holes located at both ends of the secondary pipe section 12, with a diameter of 4.5 mm. There are 96 of them in total, which are used to ignite the gas and create ignition conditions. The fixed baffle assembly includes a first ceramic baffle 6 and a second ceramic baffle 7, both made of corundum and in a number of quantities. They are used to securely install the pressure guide rod 4 and isolate it from the gas pipe 1. The first ceramic baffle 6 is connected to the secondary pipe section 12 and the insulating sleeve 3, respectively, while the second ceramic baffle 7 is connected to the main pipe section 11 and the insulating sleeve 3, respectively. The insulating sleeve 3 is fixed to the gas pipe 1 via a fixed partition assembly. The insulating sleeve 3 is used to insulate the pressure-guiding rod 4 from metal bodies such as the gas pipe 1. The insulating sleeve 3 is made of corundum, has an inner diameter of Φ6.3, and is sheathed on the pressure-guiding rod 4. The insulating sleeve 3 includes a main sleeve section and a secondary sleeve section, which are vertically connected. The secondary sleeve section is connected to the secondary pipe section 12 via a first ceramic partition 6, and the main sleeve section is connected to the main pipe section 11 via a second ceramic partition 7. The pressure-guiding rod 4 is used to guide the pressure of the 6KV ignition power supply and is made of 1800°C heat-resistant high-temperature hard alloy steel. The pressure-guiding rod 4 is a Φ6, Cr28Ni48W5 high-temperature resistant alloy steel rod, which is sheathed in the insulating sleeve 3 and fixed to the ignition gas pipe 1 via the external insulating sleeve 3 and the fixed partition assembly. One end of the pressure-guiding rod 4 is connected to the ignition power supply, and the other end of the pressure-guiding rod 4 extends out of the insulating sleeve 3 and faces the side of the ignition hole 2. The ignition power supply includes an ignition electrode 5 and an ignition transformer, which are connected to provide an ignition spark. The ignition electrode 5 is connected to the pressure rod 4. The ignition electrode 5 receives the 6KV ignition voltage signal from the ignition transformer to generate a spark between the end of the pressure rod 4 and the ignition hole 2. The spark ignites the gas in the area of ​​the ignition hole 2.

[0034] In this embodiment, the insulating sleeve 3 and the pressure-guiding rod 4 are both L-shaped, and their structural shapes are adapted to the structural shape of the gas pipe 1 .

[0035] In this embodiment, the secondary pipe section 12 can be constructed by intersecting two pipes at a certain angle, forming a cross-shaped structure. When the intersection is perpendicular, the secondary pipe section 12 forms a cross. In this case, there are four groups of insulating sleeves 3, pressure-guiding rods 4, and ignition electrodes 5, each evenly distributed around the periphery of the gas pipe 1. The distribution of the insulating sleeves 3 or ignition electrodes 5 depends on the structure of the gas pipe 1 (main section 11 and secondary pipe section 12). This increases the combustion temperature and ensures more efficient baking.

[0036] In this embodiment, the end of the pressure-guiding rod 4 is processed with an external thread, which is connected to the ignition electrode 5 by a threaded connection method. In this way, it is easy to disassemble and use.

[0037] In this embodiment, the ignition gun device is entirely built into the burner air duct of the torpedo tank baking device. Under normal circumstances, the temperature in the air duct is lower than the baking atmosphere temperature inside the torpedo tank due to the continuous flow of external air. The ignition gun device is designed to have a heat resistance temperature that is more than twice the burner air duct temperature, thereby effectively enabling the ignition gun device to work stably for a long time.

[0038] The beneficial effects of this embodiment are as follows: by providing a pressure-guiding rod 4, an ignition power supply, etc., the device can realize automatic ignition, can avoid safety accidents caused by manual ignition in the gas area, and safety hazards such as flameout during baking; by building the ignition gun into the burner air pipeline of the torpedo tank baking device, and by adopting a high-temperature resistant hard pressure-guiding rod 4 and providing an insulating sleeve 3 for isolation and protection, the device can overcome the problem that conventional high-voltage ignition cables cannot operate for a long time in an environment exceeding 75°C, and overcome the problem that conventional ignition devices cannot be used under extreme working conditions such as high temperature in a torpedo tank; by providing the auxiliary pipe section 12 as a cross tubular structure, the device can increase the combustion temperature, and can make baking more sufficient and effective. Example 4

[0039] A torpedo tank baking device includes a torpedo tank, a gas delivery system (gas pipeline), an auxiliary gas delivery system, a T-shaped burner, and the above-mentioned integrated ignition gun. The T-shaped burner extends into the burner portion of the torpedo tank, and the integrated ignition gun is built into the air pipeline of the T-shaped burner. A gas pipe 1 of the ignition gun is arranged in the T-shaped burner portion of the torpedo tank baking device and is connected to the main ignition gas pipe 1 by welding.

[0040] The beneficial effects of this embodiment are as follows: by integrating the ignition gun into the burner air pipeline of the torpedo tank baking device, the device can achieve automatic ignition, which is safer and more reliable. It can overcome the problem that conventional high-voltage ignition cables cannot operate for a long time in an environment exceeding 75°C, and overcome the problem that conventional ignition devices cannot be used under extreme working conditions such as high temperature inside the torpedo tank.

[0041] The working principle or process of the present invention is as follows: after the integrated ignition gun is integrally built into the burner air pipeline of the torpedo can baking device, that is, after all the equipment is assembled, the ignition gas is transported to the ignition hole 2 through the gas pipe 1, and overflows to the end of the pressure guide rod 4 through the ignition hole 2. The ignition power supply generates sparks between the end of the pressure guide rod 4 and the ignition hole 2. The sparks ignite the gas in the ignition hole 2 area as a long-lasting flame, ensuring a stable ignition state at the burner of the torpedo can baking device.

[0042] Advantages of the present invention:

[0043] 1. It can realize automatic ignition; that is, no manual torch ignition is required, which can avoid safety accidents caused by manual ignition in the gas area and safety hazards such as flameout during baking, making it safer and more reliable.

[0044] 2. It can adapt to extreme working conditions such as high temperature inside torpedo tanks, overcoming the problem that conventional high-voltage ignition cables cannot operate for a long time in an environment exceeding 75°C.

[0045] 3. Able to detect the presence of flame in real time.

[0046] 4. The overall structure is simple, easy to disassemble and assemble, and easy to use.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An integrated igniter, comprising a gas pipe (1), and an ignition hole (2) is arranged on the gas pipe (1), characterized in that, The integrated igniter further includes a fixed partition assembly, an insulating sleeve (3), a pressure guiding rod (4), and an ignition power supply. The insulating sleeve (3) is fixed to the gas pipe (1) through the fixed partition assembly. The pressure guiding rod (4) is sleeved in the insulating sleeve (3). One end of the pressure guiding rod (4) is connected to the ignition power supply, and the other end is disposed on one side of the ignition hole (2).

2. The integrated igniter according to claim 1, characterized in that, The gas pipe (1) includes a main pipe section (11) and a sub-pipe section (12), which are perpendicularly connected. The ignition holes (2) are disposed at both ends of the sub-pipe section (12).

3. The integrated igniter according to claim 2, wherein, The fixed partition assembly includes a first ceramic partition (6) and a second ceramic partition (7). The first ceramic partition (6) is respectively connected to the sub-pipe section (12) and the insulating sleeve (3). The second ceramic partition (7) is respectively connected to the main pipe section (11) and the insulating sleeve (3).

4. The integrated igniter according to claim 2, wherein, The gas pipe (1) is in a T shape. The insulating sleeve (3) and the pressure guiding rod (4) are both disposed on the periphery of the gas pipe (1), and both the insulating sleeve (3) and the pressure guiding rod (4) are in an L shape.

5. The integrated igniter according to claim 1, characterized in that, The ignition power supply includes an ignition electrode (5) and an ignition transformer, which are connected. The ignition electrode (5) is connected to the pressure guiding rod (4).

6. The integrated igniter according to claim 1, characterized in that, It further includes a sensing and detection system, and the sensing and detection system is connected to the pressure guiding rod (4).

7. The integrated igniter according to claim 1, characterized in that, The materials of the fixed partition assembly and the insulating sleeve (3) are any one of corundum and alumina ceramics.

8. The integrated igniter according to claim 7, wherein, The material of the pressure guiding rod (4) is Cr28Ni48W5, and its diameter is 6 mm. The inner diameter of the insulating sleeve (3) is 6.3 mm. The gas pipe (1) is made of a DN25 stainless steel pipe.

9. The integrated igniter according to claim 8, characterized in that, The aperture of the ignition hole (2) is 4.5 mm, and the total number is 96.

10. A torpedo ladle baking device, comprising a torpedo ladle, characterized in that, It further includes the integrated igniter as described in any one of claims 1-9 disposed on the torpedo ladle.

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