Fire suppression device for charging parking space of gas station

Abstract

The gas station charging parking space fire suppression device comprises a first vertical seat and a second vertical seat which are arranged in a spaced mode, two limiting seats are fixed to one side of the first vertical seat in a spaced mode, a first rotating shaft is movably arranged between the two limiting seats, and fireproof flame-retardant cloth is wound around the first rotating shaft; two lifting hooks are fixed to the fireproof flame-retardant cloth in a spaced mode, two lifting rings are fixed to the first vertical base in a spaced mode, the lifting hooks and the lifting rings are used in cooperation, two side bases are fixed to one side of the first vertical base and one side of the second vertical base in a spaced mode, a pipeline is arranged between the two side bases, and a plurality of spray heads are arranged on one side of the pipeline in a communicating mode. And a water inlet pipe is arranged on one side of the pipeline in a communicating mode, a balance weight base is fixed to the bottom of the first vertical base and the bottom of the second vertical base, and the problems that an existing fire extinguishing device cannot adjust the layout according to the actual use condition of a charging parking space, and the adaptability is poor are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy charging, in particular to a fire suppression device for charging parking space in gas station. BACKGROUND

[0002] With the continuous rise of the number of new energy vehicles, as a traditional fuel supply station, gas stations gradually add charging parking spaces to meet the diversified needs of users, forming a comprehensive service mode of 'fuel filling + power supply'. However, the introduction of charging parking spaces also brings new safety hazards, and the core risk is concentrated in the thermal runaway problem of new energy vehicle power batteries during charging. Power batteries are prone to fire or even explosion due to internal short circuit, overcharging, and cell aging, and the fire has the characteristics of 'fast spreading speed, high temperature lasting long, and more toxic gases', which forms a superimposed risk with flammable and explosive substances such as fuel and gasoline vapor stored in the gas station.

[0003] The existing fire extinguishing device for charging parking space in gas station is mostly fixed installation type, which cannot adjust the layout according to the actual use of charging parking space (such as the parking position of different vehicle models and the change of parking space size), and has poor adaptability.

[0004] Therefore, it is necessary to provide a new fire suppression device for charging parking space in gas station to solve the above technical problems. SUMMARY

[0005] To solve the above technical problems, the present application provides a fire suppression device for charging parking space in gas station, which solves the problem that the existing fire extinguishing device cannot adjust the layout according to the actual use of charging parking space and has poor adaptability.

[0006] The fire suppression device for charging parking space in gas station provided by the present application comprises a first stand and a second stand arranged at intervals, two limiting seats are fixed at one side of the first stand at intervals, a first rotating shaft is movably arranged between the two limiting seats, a fireproof and flame-retardant cloth is wound around the first rotating shaft, and two hooks are fixed on the fireproof and flame-retardant cloth at intervals; Two lifting rings are fixed on the second stand at intervals, and the hooks are used in cooperation with the lifting rings; Two side seats are fixed on one side of the first stand and the second stand at intervals, a pipeline is arranged between the two side seats, a plurality of spray heads are communicatively arranged on one side of the pipeline, and a water inlet pipe is communicatively arranged on one side of the pipeline.

[0007] In a preferred embodiment, a counterweight seat is fixed at the bottom of the first stand and the second stand, and a plurality of universal wheels are fixed on both sides of the counterweight seat.

[0008] In a preferred embodiment, a second rotating shaft is movably arranged on the first stand, and a first bevel gear is installed on the second rotating shaft. The first rotating shaft top is provided with a second bevel gear, and the first bevel gear is engaged with the second bevel gear. The first vertical seat is provided with a first motor on one side, and the output end of the first motor is connected with the first rotating shaft through a shaft coupling.

[0009] In a preferred embodiment, the top and bottom of the pipeline are fixed with sealing plates, the sealing plates are fixedly connected with the side seats, a second motor is installed on the first vertical seat, and the output end of the second motor is fixedly connected with the sealing plate.

[0010] In a preferred embodiment, the fireproof and flame-retardant cloth comprises a polyester cloth base layer, fireproof paint is arranged on both sides of the polyester cloth base layer, a fireproof film layer is arranged on one side of the fireproof paint, an anti-ultraviolet layer is arranged on one side of the fireproof film layer, and a tear-resistant layer is arranged on one side of the anti-ultraviolet layer.

[0011] In a preferred embodiment, the counterweight seat is internally provided with a placing groove, a horizontal seat is fixedly arranged in the placing groove, two slide columns and a threaded rod are arranged in penetrating mode on the horizontal seat, the threaded rod is threadedly connected with the horizontal seat, and the slide columns are slidably connected with the horizontal seat. The counterweight seat is provided with a friction plate below, the friction plate is fixedly provided with a threaded sleeve at the top, and the threaded sleeve is threadedly connected with the threaded rod.

[0012] In a preferred embodiment, a third bevel gear is arranged at the top of the threaded rod, a transmission shaft is movably arranged in the counterweight seat, a fourth bevel gear is arranged on the transmission shaft, and the third bevel gear is engaged with the fourth bevel gear. The counterweight seat is provided with a third motor on one side, and the output end of the third motor is connected with the transmission shaft through a shaft coupling.

[0013] In a preferred embodiment, the first bevel gear, the second bevel gear, the third bevel gear and the fourth bevel gear all adopt closed transmission.

[0014] The present application has the following advantages: 1. The device is equipped with a universal wheel with a brake, the distance between the first vertical seat and the second vertical seat can be flexibly adjusted according to the actual size of the charging parking space and the parking position of the vehicle on fire, different vehicle models (such as cars, SUVs and trucks) can be adapted to the charging parking space; the expansion and winding of the fireproof and flame-retardant cloth are automatically driven by the first motor, without the need for manual effort, and a single person can complete all operations; the overall structure is lightweight and convenient to move, solving the problems of poor scene adaptability and complicated operation of traditional fixed fire-fighting devices.

[0015] 2. The device forms a physical isolation barrier by the expandable multi-layer composite fireproof flame-retardant cloth when a fire occurs, the polyester cloth base layer provides structural strength, the intumescent fire retardant paint and the polytetrafluoroethylene fireproof film layer cooperate to block the flame and high temperature, and the ultraviolet resistant layer and the tear resistant layer prolong the service life; the isolation barrier can effectively separate the vehicle on fire from the fuel facilities in the gas station and other vehicles, avoid the flame spread and high temperature radiation to cause secondary accidents, and solve the problem of lack of effective isolation means for the traditional gas station charging parking space.

[0016] 3. The spray fire extinguishing assembly adopts a rotatable pipeline and atomizing nozzle design, the second motor drives the pipeline to rotate at multiple angles, ensuring that the water spray covers all key areas of the vehicle on fire, such as the top, side and bottom, with no blind area for fire extinguishing; the atomizing nozzle sprays misty water flow that can quickly cool down and avoid safety hazards caused by water flow impact, and in cooperation with a high-pressure water source, the fire can be controlled in a short time; the quick plug interface design of the water inlet pipe realizes quick water connection, solving the problems of poor adaptability and low fire extinguishing efficiency of the traditional fixed spray system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The main structure perspective view of the gas station charging parking space fire suppression device provided by the application is shown in the figure. Figure 2 The enlarged structure schematic view of A shown in the figure. Figure 1 Figure 3 The main structure plan view of the gas station charging parking space fire suppression device provided by the application is shown in the figure. Figure 4 The structure view of the fireproof flame-retardant cloth provided by the application is shown in the figure. Figure 5 The structure front view of the counterweight seat provided by the application is shown in the figure.

[0018] Figure reference: 1, first stand; 2, second stand; 3, limit seat; 4, first rotating shaft; 5, fireproof flame-retardant cloth; 6, hook; 7, eye; 8, side seat; 9, pipeline; 10, nozzle; 11, water inlet pipe; 12, counterweight seat; 13, universal wheel; 14, second rotating shaft; 15, first bevel gear; 16, second bevel gear; 17, first motor; 18, sealing plate; 19, second motor; 20, polyester cloth base layer; 21, fire retardant paint; 22, fireproof film layer; 23, ultraviolet resistant layer; 24, tear resistant layer; 25, placing groove; 26, horizontal seat; 27, slide column; 28, threaded rod; 29, friction plate; 30, threaded sleeve; 31, third bevel gear; 32, transmission shaft; 33, fourth bevel gear; 34, third motor. DETAILED DESCRIPTION

[0019] The application will be further described below in combination with the drawings and embodiments. ​

[0020] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , wherein Figure 1 is the main structure of the gas station charging parking space fire suppression device provided by the application; Figure 2 is the enlarged structural schematic view of A shown in Figure 1 ; Figure 3 is the main structure of the gas station charging parking space fire suppression device provided by the application; Figure 4 is the structural view of the fireproof flame-retardant cloth provided by the application; Figure 5 is the structural front view of the counterweight seat provided by the application.

[0021] In the specific implementation process, as shown in Figures 1-5 , it comprises a first stand 1 and a second stand 2 arranged at intervals, two limiting seats 3 are fixed at one side of the first stand 1, a first rotating shaft 4 is movably arranged between the two limiting seats 3, a fireproof flame-retardant cloth 5 is wound around the first rotating shaft 4, and two hooks 6 are fixed at intervals on the fireproof flame-retardant cloth 5; two lifting rings 7 are fixed at intervals on the second stand 2, and the hooks 6 and the lifting rings 7 are used in cooperation; two side seats 8 are fixed at intervals on one side of the first stand 1 and the second stand 2, a pipeline 9 is arranged between the two side seats 8, a plurality of spray heads 10 are arranged in communication on one side of the pipeline 9, and a water inlet pipe 11 is arranged in communication on one side of the pipeline 9.

[0022] The first stand 1 and the second stand 2 are fixed with a counterweight seat 12 at the bottom, and a plurality of universal wheels 13 are fixed on both sides of the counterweight seat 12.

[0023] A second rotating shaft 14 is movably arranged on the first stand 1, and a first bevel gear 15 is installed on the second rotating shaft 14; a second bevel gear 16 is installed on the top of the first rotating shaft 4, and the first bevel gear 15 is engaged with the second bevel gear 16; a first motor 17 is installed on one side of the first stand 1, and the output end of the first motor 17 is connected with the first rotating shaft 4 through a shaft coupling.

[0024] Sealing plates 18 are fixed on the top and the bottom of the pipeline 9, and the sealing plates 18 are fixedly connected between the side seats 8; a second motor 19 is installed on the first stand 1, and the output end of the second motor 19 is fixedly connected with the sealing plates 18.

[0025] The fireproof flame-retardant cloth 5 comprises a polyester cloth base layer 20, fireproof paint 21 is arranged on both sides of the polyester cloth base layer 20, a fireproof film layer 22 is arranged on one side of the fireproof paint 21, an anti-ultraviolet layer 23 is arranged on one side of the fireproof film layer 22, and a tear-resistant layer 24 is arranged on one side of the anti-ultraviolet layer 23.

[0026] The counterweight seat 12 is internally provided with a placing groove 25, the placing groove 25 is internally fixed with a cross seat 26, two slide columns 27 and a threaded rod 28 are penetratingly arranged on the cross seat 26, the threaded rod 28 is threadedly connected with the cross seat 26, and the slide column 27 is slidingly connected with the cross seat 26; a friction plate 29 is arranged below the counterweight seat 12, the friction plate 29 is fixed with a threaded sleeve 30 at the top, and the threaded sleeve 30 is threadedly connected with the threaded rod 28.

[0027] A third bevel gear 31 is mounted at the top of the threaded rod 28, a transmission shaft 32 is movably arranged in the counterweight seat 12, a fourth bevel gear 33 is mounted on the transmission shaft 32, and the third bevel gear 31 is engaged with the fourth bevel gear 33; a third motor 34 is mounted on one side of the counterweight seat 12, and the output end of the third motor 34 is connected with the transmission shaft 32 through a shaft coupling. The first bevel gear 15, the second bevel gear 16, the third bevel gear 31 and the fourth bevel gear 33 all adopt closed transmission, thereby improving the service life.

[0028] The first stand 1 and the second stand 2 are both made of high-strength aluminum alloy material, have light weight and high bearing capacity, and are symmetrically arranged and spaced apart from each other at two side edges of the charging parking space (the initial spacing distance is matched with the standard charging parking space width, and can be adjusted according to actual requirements). The first stand 1 is adjacent to one side of the second stand 2 and is fixed with two parallel and spaced apart limiting seats 3 through bolts, the limiting seat 3 is a U-shaped steel structure, a bearing is embedded in the limiting seat 3, the first rotating shaft 4 is movably connected between the two limiting seats 3 through the bearing, the first rotating shaft 4 is made of stainless steel and has a smooth outer wall, and is used for winding the fireproof and flame-retardant cloth 5; one end of the fireproof and flame-retardant cloth 5 is fixed on the first rotating shaft 4 through welding or bonding, and the other end is spaced apart in the length direction and sewn with two stainless steel hooks 6, the hook 6 has a closed structure and has a anti-falling function.

[0029] Two lifting rings 7 are welded at a position corresponding to the hook 6 on the side of the second stand 2 close to the first stand 1, the lifting ring 7 has a circular ring structure, the inner diameter of the lifting ring 7 is matched with the size of the hook body of the hook 6, so that the hook 6 can be quickly hung and is not easy to fall off. Two vertical and spaced apart side seats 8 are welded on the outer sides (the sides away from the charging parking space) of the first stand 1 and the second stand 2, the side seat 8 has a hollow rectangular structure, a bearing is arranged in the side seat 8, and the pipeline 9 is movably connected between the two side seats 8 through the bearing; the pipeline 9 is made of corrosion-resistant plastic material (or stainless steel material), a plurality of spray heads 10 are uniformly distributed on the wall of the pipeline 9, the spray head 10 is an atomizing spray head, the number of the spray heads 10 is set to 6-10 according to the length of the pipeline 9, so that the water spraying coverage can completely cover a single charging parking space; one end of the pipeline 9 is closed, the other end is connected with a water inlet pipe 11 through a flange, and the end of the water inlet pipe 11 is provided with a quick plug interface, so that the water inlet pipe 11 can be quickly connected with a fire-fighting water source pipeline or a mobile water pump in the gas station.

[0030] The bottom of the first pedestal 1 and the second pedestal 2 is welded with a counterweight seat 12, which is a concrete-filled steel structure box, providing basic counterweight in the initial state to prevent the device from toppling over; the two sides of the counterweight seat 12 are fixed with four universal wheels 13 through bolts, and the universal wheels 13 are selected to be silent universal wheels with brake function, facilitating the movement and temporary fixing of the device. The top of the first pedestal 1 is movably provided with a second rotating shaft 14 through a support, the second rotating shaft 14 is perpendicular to the first rotating shaft 4, one end of the second rotating shaft 14 is installed with a first bevel gear 15, and the top of the first rotating shaft 4 is installed with a second bevel gear 16 at the corresponding position, the first bevel gear 15 is engaged with the second bevel gear 16 to form a vertical transmission structure; the outer side of the first pedestal 1 is installed with a first motor 17 through a motor support, the first motor 17 is selected to be a servo motor, the output end of which is connected with the second rotating shaft 14 through a shaft coupling, the first rotating shaft 4 is driven to rotate by the forward and reverse rotation of the first motor 17, realizing the winding and unwinding of the fireproof and flame-retardant cloth 5.

[0031] The top and bottom of the pipeline 9 are welded with sealing plates 18, which are circular metal plates with a diameter larger than the outer diameter of the pipeline 9, used to prevent water leakage of the pipeline 9 during rotation; the outer side of the sealing plate 18 is connected with the bearing in the side seat 8, and the outer side of the first pedestal 1 (or the second pedestal 2) is installed with a second motor 19 through a motor support, the second motor 19 is selected to be a stepping motor, the output end of which is fixedly connected with the sealing plate 18 through a shaft coupling, the pipeline 9 is driven to rotate around the side seat 8 by the forward and reverse rotation of the second motor 19, adjusting the water spraying angle of the nozzle 10 (the rotating range is 0-90°, which can cover different positions such as the top and side of the vehicle).

[0032] The fireproof and flame-retardant cloth 5 adopts a multi-layer composite structure, from inside to outside, it is a polyester cloth base layer 20, a fireproof paint 21, a fireproof film layer 22, an anti-ultraviolet layer 23, and a tear-resistant layer 24; wherein the polyester cloth base layer 20 is woven from high-strength polyester fiber, providing basic structural strength; the fireproof paint 21 is an intumescent fireproof paint, which expands to form a heat insulation layer after fire, preventing high temperature transmission; the fireproof film layer 22 is a polytetrafluoroethylene film, which has the characteristics of high temperature resistance and open flame resistance; the anti-ultraviolet layer 23 is an ultraviolet absorber coating, preventing outdoor sun exposure from causing the fireproof cloth to age; the tear-resistant layer 24 is a nylon fiber woven layer, which improves the tensile and tear resistance of the fireproof cloth and prolongs the service life.

[0033] The inside of the counterweight seat 12 is provided with a rectangular placing groove 25, and a cross seat 26 is welded in the placing groove 25, wherein the cross seat 26 is a steel structure plate, and two slide columns 27 and a threaded rod 28 are arranged in the middle of the cross seat 26; the slide columns 27 are made of stainless steel and are in sliding connection with the cross seat 26, and the slide columns 27 serve as a guide; the threaded rod 28 is in a trapezoidal thread structure and is in threaded connection with the cross seat 26, and the threaded rod 28 can rotate around its own axis; a friction plate 29 made of rubber (provided with anti-skid lines on the bottom) is arranged below the counterweight seat 12, and a threaded sleeve 30 is welded on the top of the friction plate 29, wherein the threaded sleeve 30 is in threaded connection with the threaded rod 28, and a lifting structure is formed; a third bevel gear 31 is arranged on the top of the threaded rod 28, a transmission shaft 32 is movably arranged in the placing groove 25 through a bearing, the transmission shaft 32 is perpendicular to the threaded rod 28, a fourth bevel gear 33 is arranged on the transmission shaft 32 at a position corresponding to the third bevel gear 31, and the third bevel gear 31 is in meshing connection with the fourth bevel gear 33; a third motor 34 is arranged on the outside of the counterweight seat 12 through a motor support, the third motor 34 is a servo motor, an output end of the third motor 34 is connected with the transmission shaft 32 through a shaft coupling, the threaded rod 28 is driven to rotate by the forward and reverse rotation of the third motor 34, and the lifting of the friction plate 29 is realized. In addition, the first bevel gear 15, the second bevel gear 16, the third bevel gear 31 and the fourth bevel gear 33 all adopt a closed transmission structure, and dust covers are arranged outside the transmission structure, so that dust and rainwater cannot enter the transmission components, the transmission stability is ensured, and the maintenance frequency is reduced.

[0034] The working principle of the present application is as follows: when the device is used, when a fire occurs, the staff only needs to hang the two hooks 6 on the corresponding lifting rings 7, and then moves the second stand 2 away from the first stand 1, in the moving process, the first motor 17 rotates, and under the transmission action of the first bevel gear 15 and the second bevel gear 16, the first rotating shaft 4 drives the fireproof and flame-retardant cloth 5 to rotate, thereby assisting the staff to open the fireproof and flame-retardant cloth 5. After the fireproof and flame-retardant cloth 5 is opened, the staff can move the two stands and the fireproof and flame-retardant cloth 5 to the side of the vehicle on fire, then connects the external water source with the water inlet pipe 11 through the quick connector, and finally starts the external water pump to pump water into the water inlet pipe 11 and sprays the water along the spray head 10 to the vehicle on fire, in the process, the second motor 19 is started to drive the sealing plate 18 and the pipeline 9 to move, so that the vehicle on fire can be sprayed from multiple directions. After the two stands are moved to the side of the vehicle, the third motor 34 is started to drive the transmission shaft 32 to rotate, and under the transmission action of the third bevel gear 31 and the fourth bevel gear 33, the threaded rod 28 is driven to rotate, since the threaded rod 28 is in threaded connection with the threaded sleeve 30, the threaded sleeve 30 and the friction plate 29 at the bottom of the threaded sleeve 30 are moved downward to a position in contact with the ground, thereby improving the stability of the two stands when in use. After the fire is extinguished, the water source valve is closed, the connection between the water inlet pipe 11 and the external water source is disconnected, the residual moisture in the pipeline 9 is discharged; the first motor 17 is started in reverse rotation, the first rotating shaft 4 is driven to rotate clockwise, the fireproof flame-retardant cloth 5 is wound back on the first rotating shaft 4, and the connection between the hook 6 and the lifting ring 7 is removed; the third motor 34 is started in reverse rotation, the friction plate 29 is driven to rise, the brake of the universal wheel 13 is locked, and the device is moved back to the initial storage position; the running state of each motor, the transmission gap of the bevel gear, the damage of the fireproof flame-retardant cloth 5 and the patency of the nozzle 10 are regularly checked, the worn parts are replaced, and it is ensured that the device is always in a normal standby state.

[0035] The circuit and the control involved in the present application are prior art, and will not be described in detail here.

[0036] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent flow transformation made by using the content of the specification and the drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A fire suppression device for charging parking spaces at gas stations, comprising a first upright (1) and a second upright (2) spaced apart, characterized in that, Two limiting seats (3) are fixed at intervals on one side of the first stand (1). A first rotating shaft (4) is movably arranged between the two limiting seats (3). Fireproof and flame-retardant cloth (5) is wound on the first rotating shaft (4). Two hooks (6) are fixed at intervals on the fireproof and flame-retardant cloth (5). The second stand (2) has two lifting rings (7) fixed at an interval, and the hook (6) is used in conjunction with the lifting rings (7); Two side seats (8) are fixed at intervals on one side of the first stand (1) and the second stand (2). A pipe (9) is provided between the two side seats (8). A number of nozzles (10) are connected to one side of the pipe (9), and a water inlet pipe (11) is connected to one side of the pipe (9).

2. The fire suppression device for charging parking spaces at gas stations according to claim 1, characterized in that, The first stand (1) and the second stand (2) are fixed with a counterweight (12) at their bottoms, and multiple casters (13) are fixed on both sides of the counterweight (12).

3. The fire suppression device for charging parking spaces at gas stations according to claim 2, characterized in that, A second rotating shaft (14) is movably disposed on the first stand (1), and a first bevel gear (15) is mounted on the second rotating shaft (14). A second bevel gear (16) is mounted on the top of the first rotating shaft (4), and the first bevel gear (15) meshes with the second bevel gear (16); A first motor (17) is installed on one side of the first stand (1), and the output end of the first motor (17) is connected to the first rotating shaft (4) through a coupling.

4. The fire suppression device for charging parking spaces at gas stations according to claim 3, characterized in that, The top and bottom of the pipe (9) are fixed with sealing plates (18), and the sealing plates (18) are fixedly connected to the side seat (8). A second motor (19) is installed on the first upright seat (1), and the output end of the second motor (19) is fixedly connected to the sealing plate (18).

5. The fire suppression device for charging parking spaces at gas stations according to claim 4, characterized in that, The fireproof and flame-retardant fabric (5) includes a polyester fabric base layer (20), both sides of the polyester fabric base layer (20) are provided with fireproof coating (21), one side of the fireproof coating (21) is provided with a fireproof film layer (22), one side of the fireproof film layer (22) is provided with an ultraviolet protection layer (23), and one side of the ultraviolet protection layer (23) is provided with a tear-resistant layer (24).

6. The fire suppression device for charging parking spaces at gas stations according to claim 5, characterized in that, The counterweight seat (12) has a placement groove (25) inside, and a horizontal seat (26) is fixed inside the placement groove (25). Two sliding columns (27) and a threaded rod (28) are provided through the horizontal seat (26). The threaded rod (28) is threadedly connected to the horizontal seat (26), and the sliding columns (27) are slidably connected to the horizontal seat (26). A friction plate (29) is provided below the counterweight seat (12), and a threaded sleeve (30) is fixed on the top of the friction plate (29). The threaded sleeve (30) is threadedly connected to the threaded rod (28).

7. The fire suppression device for charging parking spaces at gas stations according to claim 6, characterized in that, The threaded rod (28) is equipped with a third bevel gear (31) at the top, and a drive shaft (32) is movably arranged inside the counterweight (12). A fourth bevel gear (33) is installed on the drive shaft (32), and the third bevel gear (31) meshes with the fourth bevel gear (33). A third motor (34) is installed on one side of the counterweight (12), and the output end of the third motor (34) is connected to the transmission shaft (32) through a coupling.

8. The fire suppression device for charging parking spaces at gas stations according to claim 6, characterized in that, The first bevel gear (15), the second bevel gear (16), the third bevel gear (31) and the fourth bevel gear (33) all adopt closed transmission.

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