Anti-blocking device for semi-dry desulfurization pipe

Abstract

The utility model provides a semi-dry type desulfurization pipe anti-blocking device which comprises a desulfurization pipe connected with a mixer, a turnover baffle rotationally connected to the interior of the desulfurization pipe and a telescopic driving part used for driving the turnover baffle to vertically turn over, and rotating shafts which extend horizontally and penetrate through the desulfurization pipe are arranged on the two sides of the turnover baffle respectively. The outer end of the rotating shaft is connected with an overhanging rod, and the telescopic driving piece is rotationally connected to the outer side of the desulfurization pipe and rotationally connected with the overhanging rod. According to the anti-blocking device for the semi-dry desulfurization pipe provided by the utility model, the turnover baffle is arranged in the desulfurization pipe, and the extension rod and the turnover baffle are driven by the telescopic driving piece outside the desulfurization pipe to synchronously and vertically swing, so that the discharge pipe of the mixer is blocked by virtue of the turnover baffle; and blockage caused by accumulation of lime powder in the desulfurization pipe when the deashing equipment breaks down is avoided, subsequent overhaul and maintenance of the deashing equipment are facilitated, the subsequent desulfurization effect is guaranteed, and good practicability is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of desulfurization equipment, and more specifically, it relates to a semi-dry desulfurization pipe anti-blocking device. Background Technique

[0002] In the process of glass preparation, it is often necessary to carry out desulfurization treatment on the flue gas generated during production. Semi-dry desulfurization is a commonly used flue gas desulfurization method. By spraying lime slurry into the flue gas, a chemical reaction occurs with SO₂ to achieve the purpose of desulfurization. Semi-dry desulfurization can achieve a desulfurization efficiency of more than 90%, which can meet the environmental protection requirements. Compared with wet desulfurization, the process flow of semi-dry desulfurization is simpler, and the lime powder can be recycled, realizing the recycling of resources. Therefore, the above method is widely used in production.

[0003] In the prior art, the material is conveyed outwards by the ash cleaning equipment below the desulfurization pipe. The ash cleaning equipment often has problems of abnormal shutdown due to failures. At this time, the lime powder above the desulfurization pipe will continue to fall, which not only affects the maintenance of the ash cleaning equipment below, but also blocks the desulfurization pipe and causes waste of lime powder, which is not conducive to the subsequent desulfurization process. Content of the Utility Model

[0004] The purpose of the utility model is to provide a semi-dry desulfurization pipe anti-blocking device, which can effectively block the lime powder when the ash cleaning equipment fails, avoid the lime powder falling into the desulfurization pipe and causing blockage of the pipeline, and at the same time avoid waste of lime powder.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a semi-dry desulfurization pipe anti-blocking device, which includes a desulfurization pipe connected to a mixer, a flip baffle rotatably connected inside the desulfurization pipe, and a telescopic driving member for driving the flip baffle to vertically flip. Rotating shafts extending horizontally and passing through the desulfurization pipe are respectively arranged on both sides of the flip baffle. An outer extension rod extending radially is connected to the outer end of the rotating shaft. The telescopic driving member is rotatably connected to the outside of the desulfurization pipe and rotatably connected to the outer extension rod. The telescopic driving member is used to drive the outer extension rod to swing vertically to drive the flip baffle to swing vertically and block the discharge pipe of the mixer.

[0006] In a possible implementation manner, mounting shaft sleeves are respectively arranged on opposite side walls of the desulfurization pipe. The rotating shaft is rotatably connected inside the mounting shaft sleeve. The inner end of the outer extension rod is fixedly sleeved on the outer circumference of the rotating shaft. The outer end of the outer extension rod is rotatably connected to the telescopic end of the telescopic driving member.

[0007] In a possible implementation manner, the telescopic end of the telescopic driving member extends obliquely upward towards the side close to the mixer. An axially seated opening outward is arranged at the outer end of the outer extension rod. A connecting shaft parallel to the rotating shaft is arranged inside the axially seated. The telescopic end of the telescopic driving member is rotatably sleeved on the connecting shaft.

[0008] In some embodiments, a mounting seat is provided on the outer side of the desulfurization pipe. An installation shaft parallel to the rotation axis is provided on the mounting seat, and the fixed end of the telescopic driving member is rotatably connected to the installation shaft.

[0009] In some embodiments, there are two extension rods, and the two extension rods are respectively connected to the two rotation shafts in one-to-one correspondence. There are also two telescopic driving members, and the two telescopic driving members are symmetrically arranged on both sides of the desulfurization pipe and are respectively connected to the two extension rods in one-to-one correspondence.

[0010] In a possible implementation manner, the included angle between the extension rod and the plate surface of the turning baffle is α, and 50° < α < 70°.

[0011] In a possible implementation manner, a pushing plate is provided on the side wall of the turning baffle adjacent to the mixer. The pushing plate extends obliquely downward toward the side close to the mixer, and the pushing plate can extend into the discharge pipe under the drive of the turning baffle and clean the lime powder on the inner bottom wall of the discharge pipe.

[0012] In some embodiments, the pushing plate is a strip-shaped plate, the pushing plate extends in the horizontal direction, and the pushing plate is arranged at an acute angle with the turning baffle.

[0013] In some embodiments, a sealing gasket ring is further provided on the side wall of the turning baffle adjacent to the mixer and located outside the pushing plate. The sealing gasket ring can swing vertically along with the turning baffle to abut against the inner wall of the desulfurization pipe, and the sealing gasket ring is located outside the pushing plate.

[0014] In a possible implementation manner, the semi-dry desulfurization pipe anti-blocking device further includes a controller connected to the outside of the desulfurization pipe. The controller is electrically connected to the telescopic driving member and the ash cleaning device respectively. The controller is used to receive the start-stop signal of the ash cleaning device and send a telescopic control signal to the telescopic driving member.

[0015] In some embodiments, the controller is also electrically connected to an alarm, and the controller is used to send an alarm signal to the alarm.

[0016] The solution shown in the embodiments of the present application, compared with the prior art, by setting a turning baffle in the desulfurization pipe, using the telescopic driving member outside the desulfurization pipe to drive the extension rod and the turning baffle to swing vertically synchronously, and then using the turning baffle to block the discharge pipe of the mixer, avoiding the blockage caused by the accumulation of lime powder in the desulfurization pipe when the ash cleaning device fails, facilitating the subsequent maintenance of the ash cleaning device, ensuring the subsequent desulfurization effect, and having good practicability. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is the front view structural schematic diagram when the semi-dry desulfurization pipe anti-blocking device provided by the embodiment of the present utility model is opened;

[0019] Figure 2 It is the front view structural schematic diagram during the closing process of the semi-dry desulfurization pipe anti-blocking device provided by the embodiment of the present utility model;

[0020] Figure 3 For the embodiment of the present utility model Figure 3 The front view structural schematic diagram after the semi-dry desulfurization pipe anti-blocking device in it is closed;

[0021] Figure 4 For the embodiment of the present utility model Figure 3 The partial enlarged structural schematic diagram of I in it;

[0022] Figure 5 For the embodiment of the present utility model Figure 3 The right view structural schematic diagram of the semi-dry desulfurization pipe anti-blocking device in it;

[0023] Figure 6 For the embodiment of the present utility model Figure 3 The left view structural schematic diagram of the flipping baffle in it.

[0024] Among them, each reference numeral in the figure:

[0025] 1, desulfurization pipe; 11, installation bushing; 2, flipping baffle; 21, rotating shaft; 22, pushing plate; 23, sealing gasket ring; 3, telescopic driving member; 4, extension rod; 41, connecting shaft; 42, shaft seat; 5, mounting seat; 51, mounting shaft; 7, mixer; 71, discharge pipe. Specific embodiments

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0028] Please refer to Figures 1 to 6 , and now the semi-dry desulfurization pipe anti-blocking device provided by the present invention will be described. The semi-dry desulfurization pipe anti-blocking device includes a desulfurization pipe 1 connected to a mixer 7, a turning baffle 2 rotatably connected inside the desulfurization pipe 1, and a telescopic driving member 3 for driving the turning baffle 2 to turn vertically. On both sides of the turning baffle 2, there are respectively provided rotating shafts 21 extending horizontally and passing through the desulfurization pipe 1. The outer ends of the rotating shafts 21 are connected with outwardly extending rods 4 extending radially. The telescopic driving member 3 is rotatably connected to the outside of the desulfurization pipe 1 and is rotatably connected with the outwardly extending rod 4. The telescopic driving member 3 is used to drive the outwardly extending rod 4 to swing vertically to drive the turning baffle 2 to swing vertically and block the discharge pipe 71 of the mixer 7.

[0029] Compared with the prior art, the semi-dry desulfurization pipe anti-blocking device provided in this embodiment blocks the discharge pipe 71 of the mixer 7 by means of the turning baffle 2. By arranging the turning baffle 2 inside the desulfurization pipe 1 and using the telescopic driving member 3 outside the desulfurization pipe 1 to drive the outwardly extending rod 4 to swing vertically synchronously with the turning baffle 2, it avoids the blockage caused by the accumulation of lime powder in the desulfurization pipe 1 when the ash cleaning equipment fails, facilitates the subsequent maintenance of the ash cleaning equipment, ensures the subsequent desulfurization effect, and has good practicability.

[0030] In this embodiment, the mixer 7 is used to mix materials such as lime powder, and the lime powder is sent to the desulfurization pipe 1 through the discharge pipe 71 to achieve the desulfurization treatment of the flue gas. A dust cleaning device is provided at the lower end of the desulfurization pipe 1, which can effectively discharge the lime powder that has fallen to the lower end of the desulfurization pipe 1. When the dust cleaning device fails, it is difficult to orderly discharge the lime powder, which will cause accumulation in the desulfurization pipe 1 and then block the desulfurization pipe 1. On the one hand, it affects the maintenance operation of the dust cleaning device below, and on the other hand, it is difficult to ensure the desulfurization quality of the subsequent flue gas, affecting the desulfurization effect.

[0031] The flip baffle 2 is rotatably connected to the inside of the desulfurization pipe 1 through the rotating shafts 21 on both sides. The extension rod 4 on the rotating shaft 21 can be driven to retract by the telescopic driving member 3. The extension rod 4 and the flip baffle 2 can synchronously flip vertically downward until the flip baffle 2 blocks the nozzle of the discharge pipe 71. At this time, the plate surface of the flip baffle 2 fits the inner side wall of the desulfurization pipe 1, so that the blocking pipe is fully blocked.

[0032] It should be noted that, in order to ensure the tightness of the block, both the cross-section of the discharge pipe 71 and the desulfurization pipe 1 adopt rectangular cross-sections, which meet the fitting requirements of the flip baffle 2 with the inner side wall of the desulfurization pipe 1 and ensure a tight blocking effect.

[0033] In a possible implementation manner, please refer to Figures 1 to 6 , mounting bushings 11 are respectively provided on the opposite side walls of the desulfurization pipe 1. The rotating shaft 21 is rotatably connected to the mounting bushing 11. The inner end of the extension rod 4 is fixedly sleeved on the outer periphery of the rotating shaft 21, and the outer end of the extension rod 4 is rotatably connected to the telescopic end of the telescopic driving member 3.

[0034] In this embodiment, the mounting bushings 11 provided on the opposite side walls of the desulfurization pipe 1 are used to install the rotating shafts 21 on both sides of the flip baffle 2. The rotating shaft 21 and the mounting bushing 11 are rotationally matched with each other, which is convenient to realize the vertical flipping action of the flip plate, and then realize the blocking or opening of the discharge pipe 71. The above structure improves the convenience of use and meets the good blocking performance.

[0035] The outer end of the extension rod 4 is rotatably connected to the telescopic end of the telescopic driving member 3. The telescopic action of the telescopic driving member 3 can drive the extension rod 4 and the flip baffle 2 to swing vertically synchronously. The angle between the extension rod 4 and the telescopic driving member 3 will change. At this time, the connecting shaft 41 can realize the transformation of the relative positions between the two, meeting the driving requirements of the telescopic driving member 3 for the extension rod 4.

[0036] In a possible implementation manner, please refer to Figures 1 to 6, the telescopic end of the telescopic driving member 3 extends obliquely upward toward the side close to the mixer 7. An axle seat 42 with an opening facing outward is provided at the outer end of the extension rod 4. A connecting shaft 41 parallel to the rotating shaft 21 is provided inside the axle seat 42, and the telescopic end of the telescopic driving member 3 is rotatably sleeved on the connecting shaft 41.

[0037] In this embodiment, the telescopic driving member 3 is located below the outer end of the extension rod 4, and the telescopic driving member 3 extends obliquely upward toward the side close to the mixer 7. An axle seat 42 is provided on the extension rod 4, and a connecting shaft 41 is provided inside the axle seat 42. The telescopic driving member 3 is sleeved on the connecting shaft 41 and can form a rotational connection with the extension rod 4.

[0038] Specifically, when the telescopic driving member 3 retracts downward, it will drive the extension rod 4 and the flipping baffle 2 to swing vertically downward, so that the flipping baffle 2 seals the nozzle position of the discharge pipe 71, avoiding the lime powder from falling downward into the desulfurization pipe 1 and causing accumulation when the dust cleaning equipment fails. When the telescopic driving member 3 extends upward, it will drive the extension rod 4 and the flipping baffle 2 to swing vertically upward, so that the flipping baffle 2 opens the discharge pipe 71 to realize the orderly delivery of lime powder.

[0039] In some embodiments, please refer to Figures 1 to 6 , an installation seat 5 is provided on the outer side of the desulfurization pipe 1, and an installation shaft 51 parallel to the rotating shaft 21 is provided on the installation seat 5. The fixed end of the telescopic driving member 3 is rotatably connected to the installation shaft 51.

[0040] In this embodiment, by providing the installation seat 5 on the outer side of the desulfurization pipe 1 to install the lower fixed end of the telescopic driving member 3, and through the rotational cooperation between the fixed end of the telescopic driving member 3 and the installation shaft 51 on the installation seat 5, the requirement that the telescopic driving member 3 follows the vertical swing of the extension rod 4 during the telescopic movement is met, and the driving effect on the extension rod 4 is satisfied.

[0041] In some embodiments, there are two extension rods 4, and the two extension rods 4 are respectively connected to the two rotating shafts 21. There are also two telescopic driving members 3, and the two telescopic driving members 3 are symmetrically arranged on both sides of the desulfurization pipe 1 and are respectively connected to the two extension rods 4. By synchronously driving the two extension rods 4 with the two telescopic driving members 3, the effective driving of the flipping baffle 2 is realized, and the uniformity of the forces on both sides of the flipping baffle 2 is ensured, avoiding the jamming problem during the vertical swing of the flipping baffle 2.

[0042] In a possible implementation manner, please refer to Figures 1 to 6 , the included angle between the extension rod 4 and the plate surface of the flipping baffle 2 is α, 50° < α < 70°, so that when the extension rod 4 is driven by the telescopic driving member 3, a corresponding swing amplitude can be generated to meet the requirements of the flipping baffle 2 for sealing or opening the discharge pipe 71, ensuring a reliable sealing effect.

[0043] In a possible implementation, please refer to Figures 1 to 6 On the side wall of the turning baffle 2 adjacent to the mixer 7, there is a pushing plate 22. The pushing plate 22 extends obliquely downward toward the side close to the mixer 7. The pushing plate 22 can extend into the discharge pipe 71 of the mixer 7 under the drive of the turning baffle 2 and clean the lime powder on the inner bottom wall of the discharge pipe 71.

[0044] In this embodiment, during the process of the turning baffle 2 swinging downward to block the discharge pipe 71, the pushing plate 22 can swing vertically synchronously with the turning baffle 2 into the discharge pipe 71, and push the lime powder already distributed on the inner bottom wall of the discharge pipe 71, so that the lime powder moves upward along the plate surface of the pushing plate 22 and converges on the side of the discharge pipe 71 close to the mixer 7, avoiding affecting the downward swing of the turning baffle 2, and at the same time avoiding the lime powder at the orifice of the discharge pipe 71 from falling through the gap between the inner wall of the desulfurization pipe 1 and the turning baffle 2, ensuring the blocking effect on the discharge pipe 71.

[0045] In some embodiments, please refer to Figures 1 to 6 The pushing plate 22 is a strip-shaped plate. The pushing plate 22 extends in the horizontal direction. The pushing plate 22 and the turning baffle 2 are arranged at an acute angle. The discharge pipe 71 is a rectangular pipe with a horizontally extending inner bottom wall. The pushing plate 22 is a strip-shaped plate and extends in the horizontal direction (that is, extends circumferentially along the rotation axis 21). During the process of the pushing plate 22 swinging vertically with the turning baffle 2, it can clean the lime powder on the inner bottom wall of the discharge pipe 71, avoiding the retention of lime powder at the orifice position of the discharge pipe 71 and ensuring the effective blocking of the discharge pipe 71 by the turning baffle 2.

[0046] In some embodiments, please refer to Figures 1 to 6 On the side wall of the turning baffle 2 adjacent to the mixer 7, there is also a sealing gasket ring 23 located outside the pushing plate 22. The sealing gasket ring 23 can swing vertically with the turning baffle 2 to abut against the inner wall of the desulfurization pipe 1. The sealing gasket ring 23 is located outside the pushing plate 22.

[0047] In this embodiment, the sealing gasket ring 23 can form a sealing cooperation with the inner side wall of the desulfurization pipe 1, ensuring the effective blocking of the discharge pipe 71 by the turning baffle 2 and avoiding the lime powder from falling through the gap between the turning baffle 2 and the inner side wall of the desulfurization pipe 1. The sealing gasket ring 23 is located outside the pushing plate 22, which can avoid affecting the installation of the pushing plate 22 and realizes the reasonable layout of the structure.

[0048] In a possible implementation, please refer to Figures 1 to 6, the semi-dry desulfurization pipe anti-blocking device further includes a controller connected to the outside of the desulfurization pipe 1. The controller is electrically connected to the telescopic driving member 3 and the dust cleaning device respectively. The controller is used to receive the start-stop signal of the dust cleaning device and send a telescopic control signal to the telescopic driving member 3. The controller is also electrically connected to an alarm, and the controller is used to send an alarm signal to the alarm.

[0049] In this embodiment, the controller can receive the start-stop signal of the dust cleaning device in real time and generate a telescopic control signal according to a preset program and send it to the telescopic driving member 3. Specifically, when the dust cleaning device fails and stops, the controller can receive the stop signal of the dust cleaning device and generate a retraction control signal according to the preset program and send it to the telescopic driving member 3. At this time, the telescopic driving member 3 retracts to drive the outer extension rod 4 and the flipping baffle 2 to swing vertically to block the pipe orifice of the discharge pipe 71, avoiding the falling of lime powder.

[0050] At the same time, after receiving the stop signal of the dust cleaning device, the controller will also send an alarm signal to the alarm, and the alarm will emit an alarm sound to remind the operator to perform the maintenance operation of the subsequent equipment, improving the subsequent work efficiency.

[0051] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Semi-dry desulfurization pipe anti-blocking device, characterized in that: The invention comprises a desulfurization pipe (1) connected to a mixer (7), a flip baffle (2) rotatably connected to the inside of the desulfurization pipe (1), and a telescopic driving member (3) for driving the flip baffle (2) to flip vertically, wherein the two sides of the flip baffle (2) are respectively provided with a rotating shaft (21) extending horizontally and penetrating the desulfurization pipe (1), the outer end of the rotating shaft (21) is connected to a radially extending extension rod (4), the telescopic driving member (3) is rotatably connected to the outside of the desulfurization pipe (1) and is rotatably connected to the extension rod (4), and the telescopic driving member (3) is used to drive the extension rod (4) to swing vertically to drive the flip baffle (2) to swing vertically and block the discharge pipe (71) of the mixer (7).

2. The semi-dry desulfurization pipe anti-blocking device according to claim 1, characterized in that: Mounting sleeves (11) are respectively provided on opposite side walls of the desulfurization pipe (1), the rotating shaft (21) is rotatably connected inside the mounting sleeves (11), the inner end of the extension rod (4) is fixedly sleeved on the outer periphery of the rotating shaft (21), and the outer end of the extension rod (4) is rotatably connected to the telescopic end of the telescopic driving member (3).

3. The semi-dry desulfurization pipe anti-blocking device according to claim 2, characterized in that: The telescopic end of the telescopic driving member (3) extends obliquely upward toward a side close to the mixer (7); the outer end of the extension rod (4) is provided with a shaft seat (42) opening outward; a connecting shaft (41) arranged parallel to the rotating shaft (21) is provided in the shaft seat (42); the telescopic end of the telescopic driving member (3) is rotatably sleeved on the connecting shaft (41).

4. The semi-dry desulfurization pipe anti-blocking device according to claim 3, characterized in that: A mounting seat (5) is provided on the outer side of the desulfurization pipe (1), and a mounting shaft (51) arranged parallel to the rotating shaft (21) is provided on the mounting seat (5), and the fixed end of the telescopic driving member (3) is rotatably connected to the mounting shaft (51).

5. The semi-dry desulfurization pipe anti-blocking device according to claim 3, characterized in that: Two outrigger rods (4) are provided, and the two outrigger rods (4) are connected to the two rotating shafts (21) in a one-to-one manner. Two telescopic drive members (3) are also provided, and the two telescopic drive members (3) are symmetrically arranged on both sides of the desulfurization pipe (1) and are connected to the two outrigger rods (4) in a one-to-one manner.

6. The semi-dry desulfurization pipe anti-blocking device according to claim 1, characterized in that: The included angle between the outrigger rod (4) and the plate surface of the flip baffle (2) is α, 50°<α<70°.

7. The semi-dry desulfurization pipe anti-blocking device according to any one of claims 1 to 6, characterized in that: A push plate (22) is provided on the side wall of the flip baffle (2) adjacent to the mixer (7), and the push plate (22) extends obliquely downwardly toward the side close to the mixer (7). Driven by the flip baffle (2), the push plate (22) can extend into the discharge pipe (71) and clean the lime powder on the bottom wall of the discharge pipe (71).

8. The semi-dry desulfurization pipe anti-blocking device according to claim 7, characterized in that: The push plate (22) is a strip-shaped plate, the push plate (22) extends in a horizontal direction, and the push plate (22) and the flip baffle (2) are arranged at an acute angle.

9. The semi-dry desulfurization pipe anti-blocking device according to claim 7, characterized in that: A sealing ring (23) is also provided on the side wall of the flip baffle (2) adjacent to the mixer (7) and is located on the outer circle of the push plate (22). The sealing ring (23) can swing vertically along with the flip baffle (2) until it abuts against the inner wall of the desulfurization pipe (1). The sealing ring (23) is located on the periphery of the push plate (22).

10. The semi-dry desulfurization pipe anti-blocking device according to any one of claims 1 to 6, characterized in that: The semi-dry desulfurization pipe anti-blocking device also includes a controller connected to the outside of the desulfurization pipe (1), and the controller is electrically connected to the telescopic drive member (3) and the cleaning device respectively. The controller is used to receive the start and stop signals of the cleaning device and send a telescopic control signal to the telescopic drive member (3). The controller is also electrically connected to an alarm, and the controller is used to send an alarm signal to the alarm.

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