CN117053261A - Range hood with adjustable air suction angle - Google Patents

Abstract

The invention discloses a range hood with adjustable suction angle, which includes a body, and a control panel is provided on the front top of the body, and an oil suction plate is hinged on the front of the body, and an elastic plastic cloth is installed between the oil suction plate and the body. At the same time, an oil collection tank is connected to the bottom of the body; it also includes: a rotating rod connected through the bearing through the middle part of the right side of the body, and the rotating rod and the rotating shaft of the oil suction plate are integrated; the fixed rod is covered with a moving frame. And the bottom of the mobile frame is integrally fixed with a scraper; pressure sensors and alarms are respectively installed on the top of the front and rear sides of the mobile frame from bottom to top. This range hood with adjustable suction angle can adaptively adjust the smoking angle of the suction port of the range hood to avoid the phenomenon of smoke leakage, and can automatically alarm after the oil tank collects oil smoke and reaches the level to monitor the oil tank. The oil should be cleaned in time, and a cleaning mechanism should be set up to scrape off the accumulated sludge in the oil tank to improve cleaning efficiency and quality.

Description

A range hood with adjustable suction angle

Technical field

The invention relates to the technical field of range hoods, specifically a range hood with adjustable suction angle.

Background technique

As a necessary household appliance in the kitchen, the range hood will produce oil fumes when preparing food. The oil fumes are more harmful to people's eyes and skin. Therefore, a range hood will be installed on the stove, which will cause harmful effects during the food preparation process. The oil fume is absorbed in time. The oil fume is sucked into the oil suction port. After passing through the oil net, it is discharged through the outlet. The oil fume remaining on the oil net will form oil droplets and drip into the oil tank at the bottom of the hydraulic press for centralized collection. The oil tank is full. Clean up in time after oiling to clean the oil in the oil tank for subsequent use;

Publication No. CN107575921A discloses a cleaning structure for a range hood fan, which includes a volute-shaped wind cabinet. A turbine fan is installed inside the wind cabinet. A high-temperature steam nozzle is provided above the wind cabinet. The high-temperature steam nozzle is provided on the turbine. Above the fan, a hot air fan is provided above the wind cabinet. An arc-shaped oil collection tank is provided below the wind cabinet. The oil collection tank is provided below the turbine fan. An opening and a sealing switch for the opening are provided below the oil collection tank. The opening is connected to a conduit, and the end of the conduit is arranged above the oil pot of the hydraulic press. When in use, the high-temperature steam nozzle sprays high-temperature steam to melt the oil. The hot air blower blows off the oil and enters the oil collecting tank for collection. The fan automatically It is cleaned and equipped with an oil collection structure for effective decontamination;

A side-suction range hood and its control method disclosed in Publication No. CN113280387A are provided with an angle adjustment device so that the sensor can rotate and the sensor can swing between two burners, so that the measurement range of the sensor can cover a single The stove head solves the problem in the prior art that the sensor detection angle is too small to cover two stoves, making the temperature data obtained inaccurate. At the same time, the control method of a side-suction range hood of the present invention uses an angle measurement adjustment device. After adjusting the detection angle of the sensor and obtaining accurate temperature data, the temperature of the two burners on the stove can be judged and the wind speed adjusted. Compared with the existing technology, there is no need to communicate through Bluetooth or radio frequency to achieve smoke. With the linkage of the stove, there is no need to manually adjust the wind speed of the range hood to achieve efficient smoke removal, saving time and effort:

However, the above solution still has the following problems during use: when absorbing the generated oil smoke, although a detector can be set to detect the use of the stove, when making different foods, such as stir-frying and stir-frying, the oil smoke generated The size and direction are different, and the smoking port of the range hood is fixed, which can easily cause smoke to escape, making it difficult to adjust the suction angle of the smoking port according to needs, and the accumulated oil on the oil net will form oil droplets and then fall into the In the oil tank, it is necessary to manually check whether the oil storage in the oil tank is full. It is not convenient to automatically remind, and the oil droplets are mixed with dust and other substances, which makes it easy to deposit sludge on the inner bottom of the oil tank. Direct cleaning cannot remove it. The oil sludge cleaning process requires the use of tools to scrape it off, which makes the cleaning work of the oil tank cumbersome and time-consuming, and it is inconvenient to effectively clean the oil stains.

Therefore, we propose a range hood with adjustable suction angle to solve the above-mentioned problems.

Contents of the invention

The object of the present invention is to provide a range hood with an adjustable suction angle to solve the problem of the existing range hoods currently on the market proposed by the above-mentioned background technology. When absorbing the generated oil smoke, although a detector is provided to detect the stove However, when making different foods, such as stir-frying and stir-frying, the size and direction of the fume produced are different, and the smoking port of the range hood is fixed, which easily causes smoke to escape, making it inconvenient to adjust the smoking port according to needs. The suction angle is adjusted, and the accumulated oil on the oil screen gathers into oil droplets and falls into the oil tank. Later, it is necessary to manually check whether the oil storage in the oil tank is full. It is not convenient to automatically remind, and the oil droplets are mixed with dust. and other substances, which makes it easy for oil sludge to deposit on the inner bottom of the oil tank. Direct cleaning cannot clean the oil sludge, and tools need to be used to scrape it off. This makes the cleaning work of the oil tank cumbersome and time-consuming, and it is inconvenient to effectively clean the oil stains.

In order to achieve the above object, the present invention provides the following technical solution: a range hood with adjustable suction angle, including a body, and a control panel is provided on the front top of the body, and an oil suction plate is hinged on the front of the body, and the oil suction plate is connected to the body Elastic plastic cloth is installed between them, while the bottom of the body is connected to an oil collection tank, and an oil net is installed in the middle of the oil absorption plate;

It also includes: a rotating rod connected through the bearing in the middle part of the right side of the body, and the rotating rod and the rotating shaft of the oil suction plate are integrated;

A fixed rod is installed transversely in the middle of the inner side of the oil collecting tank, and a moving frame is set on the fixed rod, and a scraper is integrally fixed at the bottom of the moving frame, and the scraping plate is used to scrape the sludge on the inner bottom of the oil collecting tank. remove;

Vertical slots are symmetrically provided on the front and rear sides of the mobile frame, and a floating plate is slidably connected in the vertical slot, and a column is fixed on the top of the floating plate, and pressure sensors and alarms are respectively installed on the top of the front and rear sides of the mobile frame from bottom to top. device.

Preferably, a latch is connected to the outer right side of the rotating rod, and a first spring is installed between the latch and the rotating rod, and the end of the latch is engaged with the slot, and the slots are distributed in a circle and at equal angles. On the outside of the right side of the body, at the same time, the rotating rod drives the oil suction plate to form an angle adjustment structure, so that after the latch is pulled, the first spring will be compressed and separated from the slot, thereby driving the oil suction plate to rotate through the rotating rod.

Preferably, limit blocks are installed symmetrically on the top inner sides of the left and right sides of the oil collection tank, and the limit blocks are connected to the limit grooves, and the limit grooves are symmetrically opened on the outer bottoms of the left and right sides of the body, and the limit blocks and The limit grooves are all set in a dovetail-shaped structure, so that when the oil collection tank is disassembled and assembled, the limit block will move in the limit groove, thereby maintaining the stability of disassembly and assembly.

Preferably, the top of the moving frame is connected with a second knob through the bearing, and a torsion spring is installed between the second knob and the moving frame, and a second pull cord is wound around the bottom of the second knob, and the second pull cord The bottom is fixedly connected with the clamping block, and the clamping block is symmetrically penetrated and slidably connected to the inner walls on both sides of the fixed rod, so that after the second knob is rotated, the second pull cord drives the clamping block to slide, thereby reversing the torsion spring.

Preferably, a third spring is installed between the clamping block and the fixed rod, and the clamping block forms a telescopic sliding structure through the second pull cord and the third spring, and the clamping block is engaged with the slider, and the slider is connected to In the chute, the chute is symmetrically opened in the middle of the front and rear sides of the fixed rod, so that the clamping block engages with the slider under the push of the third spring, thereby connecting the moving frame with the fixed rod.

Preferably, a first knob is connected through the middle of the right side of the oil collection tank, and a first pull rope is wound around the outside of the first knob, and the end of the first pull rope is fixedly connected to the slider, and the slider is provided It is a hollow rectangular structure, and a second spring is installed between the slider and the chute, so that after the first knob is rotated, the slider will be driven to move through the first pull cord, thereby compressing the second spring.

Preferably, the clamping block is configured as a rectangular column structure, and both the clamping block and the sliding block are configured as magnetic structures, and the magnetic poles of the clamping block and the sliding block are opposite, and the sliding block drives the mobile frame to slide horizontally through the sliding block, so that the clamping block Connect with the slider adsorption to move horizontally.

Preferably, the scraper at the bottom of the mobile frame is set in an "L" shape, and the end of the scraper is in contact with the inner wall of the oil collection tank, so that when the mobile frame moves, the scraper will move synchronously, and the scraper will move. Then the sludge in the oil collection tank will be scraped off.

Preferably, the floating plate is arranged in a "T" shape structure, and the floating plate and the vertical groove are fitted and then slid, and the floating plate is movable against the pressure sensor through the column, and the floating plate, the column, the pressure sensor and The alarm forms an automatic alarm mechanism, which causes the floating plate to move with the liquid surface, and then drives the column to conflict and squeeze the pressure sensor, causing the alarm to automatically alarm and remind people.

Compared with the prior art, the beneficial effect of the range hood with adjustable suction angle of the present invention is that during use, the smoking angle of the suction port of the range hood can be adaptively adjusted according to actual needs, thereby It avoids the phenomenon of smoke leakage, and can automatically alarm when the oil smoke collected in the oil tank reaches the level, clean the oil in the oil tank in a timely manner, and set up a cleaning mechanism to scrape off the accumulated sludge in the oil tank to improve the cleaning efficiency and quality. The details are as follows:

1. After the latch is pulled according to the setting, the first spring will be compressed, thereby separating the latch from the slot in the initial position, and then the rotating rod can be rotated. The rotation of the rotating rod will drive the oil suction plate to rotate synchronously, and then Adjust the adaptation angle of the oil-absorbing plate to better absorb oil fumes of different sizes produced in different production processes to avoid the phenomenon of smoke escaping. When the smoking plate rotates, an elastic plastic cloth is connected between the outside and the body. This separates the internal environment of the machine from the external environment and prevents smoke leakage;

2. Oil droplets can be collected through the oil collection tank set up, and the limit block and limit groove facilitate the easy disassembly and assembly of the oil collection tank. After turning the second knob on the mobile frame, the second pull rope will be tightened. , and then drive the clamping block to compress the third spring and retract, and then the mobile frame can be set on the fixed rod. After loosening the first knob, the third spring will drive the clamping block to extend and engage with the slider, and then the moving frame can be set on the fixed rod. The mobile frame is installed on the fixed rod, and after turning the first knob, the slider will be driven to move in the chute through the second pull rope, thereby compressing the second spring, thereby driving the mobile frame to move in the oil collection tank. Move, the moving frame will drive the scraper at the bottom to move synchronously, and then scrape off the sludge deposited at the bottom of the oil collection tank to facilitate later cleaning work;

3. When the oil collected in the oil collecting tank gradually increases, the floating plate will be driven to move upward through the vertical groove, and the floating plate will drive the column to move upward synchronously. When it reaches the highest level, the column on the floating plate will The pressure sensor is pressed against and the alarm is used to remind people in time that the oil in the oil collection tank is full and needs to be cleaned in time.

Description of the drawings

Figure 1 is a schematic diagram of the overall three-dimensional structure of the present invention;

Figure 2 is a schematic cross-sectional view of the connection between the body and the oil collecting tank of the present invention;

Figure 3 is an enlarged structural schematic diagram of position A in Figure 2 of the present invention;

Figure 4 is a schematic side structural diagram of the distribution of card slots according to the present invention;

Figure 5 is an enlarged structural schematic diagram of position B in Figure 2 of the present invention;

Figure 6 is a schematic side cross-sectional structural diagram of the connection between the fixed rod and the moving frame of the present invention;

Figure 7 is an enlarged structural schematic diagram of position C in Figure 6 of the present invention;

Figure 8 is an enlarged structural schematic diagram of D in Figure 2 of the present invention;

Figure 9 is a schematic front structural view of the connection between the clamping block and the sliding block according to the present invention.

In the picture: 1. Body; 2. Control panel; 3. Oil absorbing plate; 4. Oil net; 5. Elastic plastic cloth; 6. Oil collecting tank; 7. Rotating rod; 8. Latch; 9. First spring; 10. Card slot; 11, limit block; 12, limit slot; 13, fixed rod; 14, chute; 15, slider; 16, second spring; 17, first pull cord; 18, first knob; 19 , moving frame; 20. second knob; 21. torsion spring; 22. second pull rope; 23. clamp; 24. third spring; 25. vertical slot; 26. floating plate; 27. column; 28. pressure Sensor; 29. Alarm; 30. Scraper.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Referring to Figures 1 to 9, the present invention provides a technical solution: a range hood with adjustable suction angle, including a body 1, and a control panel 2 is provided on the top of the front of the body 1, and the front of the body 1 is hinged with The oil absorbing plate 3 has an elastic plastic cloth 5 installed between the oil absorbing plate 3 and the body 1. At the same time, the bottom of the body 1 is connected to an oil collecting tank 6. The oil absorbing plate 3 is integrally installed with an oil net 4, as shown in Figure 1. First, , the main components of the range hood are introduced. It mainly consists of the body 1, and a control panel 2 is provided on the top of the front side of the body 1. The front of the body 1 is hingedly provided with an oil suction plate 3 for absorbing oil smoke. The internal structure of the body 1 It is consistent with the existing range hood, and an oil screen 4 is installed on the oil suction plate 3. The oil droplets on the oil screen 4 will fall into the oil collection tank 6 at the bottom of the body 1, and an elastic spring is installed between the oil suction plate 3 and the body 1. The plastic cloth 5 can separate the inside and outside of the machine body 1 to avoid smoke leakage;

The middle part of the right side of the body 1 is connected with a rotating rod 7 through the bearing, and the rotating shaft of the rotating rod 7 and the oil suction plate 3 is integrated. A latch 8 is connected through the outer right side of the rotating rod 7, and the latch 8 and the rotating rod 7 are connected A first spring 9 is installed in between, and the end of the latch 8 is engaged with the slot 10, and the slot 10 is distributed in a circular and equal angle on the right side of the body 1. At the same time, the rotating rod 7 drives the oil suction plate 3 to form an angle. The adjustment structure is as shown in Figures 1 to 4. After pulling the latch 8 on the rotating rod 7, the first spring 9 will be compressed, which will separate the latch 8 from the slot 10 in the initial position, and then The rotating rod 7 can be rotated. After the rotating rod 7 is rotated, the oil suction plate 3 will be driven to rotate synchronously, thereby adjusting the angle of the oil fume suction, so as to better absorb the oil fume under different production conditions and prevent smoke from escaping;

The limit blocks 11 are symmetrically installed on the top inner sides of the left and right sides of the oil collecting tank 6, and the limit blocks 11 are connected to the limit grooves 12, and the limit grooves 12 are symmetrically opened on the outer bottoms of the left and right sides of the body 1, and the limit blocks 11 11 and the limit groove 12 are both arranged in a dovetail-shaped structure. A fixed rod 13 is installed laterally in the middle of the inner side of the oil collection tank 6, and a moving frame 19 is set on the fixed rod 13. The top of the moving frame 19 is connected with a second bearing through the bearing. Knob 20, and a torsion spring 21 is installed between the second knob 20 and the moving frame 19, and a second pull cord 22 is wound around the bottom of the second knob 20, and the bottom of the second pull cord 22 is fixedly connected to the blocking block 23 , at the same time, the blocking block 23 is symmetrically penetrated and slidably connected to the inner walls of both sides of the fixed rod 13. A third spring 24 is installed between the blocking block 23 and the fixed rod 13, and the blocking block 23 is composed of a second pull cord 22 and a third spring 24. Telescopic sliding structure, and the block 23 is engaged with the slider 15, and the slider 15 is connected to the chute 14, and the chute 14 is symmetrically opened in the middle of the front and rear sides of the fixed rod 13, as shown in Figures 1-2 and Figures 5-As shown in Figure 7, the oil collection tank 6 is slidably disassembled on the body 1 through the limit block 11 and the limit groove 12, and after turning the second knob 20 on the moving frame 19, the torsion spring 21 will be reversed. Turn, the second knob 20 will pull the second pull cord 22, the second pull cord 22 will drive the block 23 to compress the third spring 24 and retract, and then the movable frame 19 will be set on the fixed rod 13. After loosening the second knob 20, the torsion spring 21 will rotate, thereby relaxing the second pull cord 22, and the third spring 24 will drive the clamping block 23 to extend and engage with the slider 15;

A first knob 18 is connected through the middle of the right side of the oil collecting tank 6, and a first pull rope 17 is wound around the outside of the first knob 18, and the end of the first pull rope 17 is fixedly connected to the slider 15, and the slider 15 is configured as a hollow rectangular structure, and a second spring 16 is installed between the slider 15 and the chute 14. The clamping block 23 is configured as a rectangular column structure, and both the clamping block 23 and the sliding block 15 are configured as magnetic structures, and the clamping block 23 is configured as a rectangular column structure. The magnetic poles of the block 23 and the slider 15 are opposite, and the slider 15 drives the movable frame 19 to slide horizontally through the clamping block 23. A scraper 30 is integrally fixed at the bottom of the movable frame 19, and the scraper 30 is used to clean the inner bottom of the oil collection tank 6 The sludge is scraped off. The scraper 30 at the bottom of the movable frame 19 is set in an "L" shape, and the end of the scraper 30 fits the inner wall of the oil collection tank 6. As shown in Figures 5 to 9, the rotating collector After the first knob 18 is placed outside the oil tank 6, the first knob 18 will drive the slider 15 to move in the chute 14 through the first pull rope 17, thereby compressing the second spring 16. After the slider 15 moves, it will drive The movable frame 19 moves synchronously, thereby driving the scraper 30 at the bottom to scrape the sludge on the inside bottom of the oil collection tank 6. After the first knob 18 is loosened, the second spring 16 will drive the slider 15 to reset, thus driving the movable frame 19 The reciprocating movement facilitates cleaning work, and the movable frame 19 can also be removed for cleaning later;

Vertical slots 25 are symmetrically provided on the front and rear sides of the mobile frame 19, and a floating plate 26 is slidably connected in the vertical slot 25, and a column 27 is fixed on the top of the floating plate 26, and the tops of the front and rear sides of the mobile frame 19 are respectively installed with The pressure sensor 28 and the alarm 29, the floating plate 26 are arranged in a "T" shape structure, and the floating plate 26 and the vertical groove 25 are fitted and then slid, and the floating plate 26 movablely conflicts with the pressure sensor 28 through the column 27, Moreover, the floating plate 26, the column 27, the pressure sensor 28 and the alarm 29 constitute an automatic alarm mechanism. As shown in Figure 5-7, when the oil collection tank 6 collects more and more oil during use, it will The floating plate 26 is driven to move upward along the vertical groove 25. When it moves to the highest position, the column 27 on the floating plate 26 will squeeze and conflict with the pressure sensor 28, thereby triggering the alarm 29 to alert people. Clean the waste oil in the oil collection tank 6 in time.

Contents not described in detail in this specification belong to the prior art known to those skilled in the art.

In the description of the present invention, unless otherwise stated, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer" , "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Any indication or implication that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation should not be construed as a limitation on the invention. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. Ground connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides an adjustable lampblack absorber of angle of breathing in, includes organism (1), and the front top of organism (1) is provided with control panel (2), and the front of organism (1) articulates there is oil absorption board (3), installs elasticity plastic cloth (5) between oil absorption board (3) and organism (1), and the bottom of organism (1) is connected with oil collecting tank (6) simultaneously, the mid-mounting of oil absorption board (3) has oil net (4);

the method is characterized in that: further comprises:

the middle part of the right side of the machine body (1) is connected with a rotating rod (7) through a bearing, and the rotating rod (7) and a rotating shaft of the oil absorption plate (3) are integrally arranged;

a fixed rod (13) is transversely arranged in the middle of the inner side of the oil collecting groove (6), a movable frame (19) is sleeved on the fixed rod (13), a scraping plate (30) is integrally fixed at the bottom of the movable frame (19), and the scraping plate (30) is used for scraping oil sludge at the bottom of the inner side of the oil collecting groove (6);

vertical grooves (25) are symmetrically formed in the front side and the rear side of the movable frame (19), floating plates (26) are slidably connected in the vertical grooves (25), vertical columns (27) are fixed at the tops of the floating plates (26), and pressure sensors (28) and alarms (29) are respectively arranged at the tops of the front side and the rear side of the movable frame (19) from bottom to top.

2. The adjustable suction angle range hood of claim 1, wherein: the right side outside through connection of bull stick (7) has bolt (8), and installs first spring (9) between bolt (8) and bull stick (7) to the tip and draw-in groove (10) looks block of bolt (8), draw-in groove (10) are circular equiangular distribution in the right side outside of organism (1) moreover, and bull stick (7) drive oil absorption board (3) simultaneously and constitute angle adjustment structure.

3. The adjustable suction angle range hood of claim 1, wherein: limiting blocks (11) are symmetrically arranged on the inner sides of the tops of the left side and the right side of the oil collecting groove (6), the limiting blocks (11) are connected into limiting grooves (12), the limiting grooves (12) are symmetrically formed in the bottoms of the outer sides of the left side and the right side of the engine body (1), and the limiting blocks (11) and the limiting grooves (12) are all of dovetail structures.

4. The adjustable suction angle range hood of claim 1, wherein: the top of remove frame (19) runs through bearing connection has second knob (20), and installs torsional spring (21) between second knob (20) and the removal frame (19) to the bottom of second knob (20) is around being equipped with second stay cord (22), and the bottom and the fixture block (23) fixed connection of second stay cord (22), and the symmetry run through sliding connection of fixture block (23) is on dead lever (13) both sides inner wall simultaneously.

5. The adjustable suction angle range hood of claim 4, wherein: install third spring (24) between fixture block (23) and dead lever (13), and fixture block (23) constitute flexible sliding structure through second stay cord (22) and third spring (24), and fixture block (23) and slider (15) block mutually, slider (15) are connected in spout (14) moreover, and the middle part of side around dead lever (13) is offered to spout (14) symmetry simultaneously.

6. The adjustable suction angle range hood of claim 1, wherein: the right side middle part through connection of oil groove (6) has first knob (18), and the outside of first knob (18) is around being equipped with first stay cord (17) to the tip and slider (15) fixed connection of first stay cord (17), slider (15) set up to hollow rectangle structure moreover, installs second spring (16) between slider (15) and spout (14) simultaneously.

7. The adjustable suction angle range hood of claim 4, wherein: the fixture block (23) is of a rectangular column structure, the fixture block (23) and the sliding block (15) are of magnetic structures, the magnetic poles of the fixture block (23) and the magnetic poles of the sliding block (15) are opposite, and the sliding block (15) drives the movable frame (19) to horizontally slide through the fixture block (23).

8. The adjustable suction angle range hood of claim 1, wherein: the scraper blade (30) of movable frame (19) bottom sets up to "L" font structure, and the tip of scraper blade (30) is laminated with the inner wall of oil groove (6).

9. The adjustable suction angle range hood of claim 1, wherein: the floating plate (26) is of a T-shaped structure, the floating plate (26) slides after being attached to the vertical groove (25), the floating plate (26) is movably abutted against the pressure sensor (28) through the upright post (27), and the automatic alarm mechanism is formed by the floating plate (26), the upright post (27), the pressure sensor (28) and the alarm (29).