Integrated cooker with noise reduction

Abstract

The application discloses a noise-reducing integrated cooker, and an oil fume extractor module comprises a main shell and an oil fume driving mechanism; the main shell is in an L shape; an integrated module is detachably fixed on a horizontal part of the main shell; a vertical part of the main shell is formed with an air duct, and the horizontal part is formed with a driving cavity; the air duct is formed with a horizontal opening air inlet on a side wall close to the integrated module; the air duct and the driving cavity are in communication; the oil fume driving mechanism comprises an oil fume driving outer box and an oil fume driving assembly; the oil fume driving assembly is used for extracting oil fume; the oil fume driving outer box comprises an outer box body and four rectangularly distributed connecting screw rods; the outer box body is provided with an opening at an upper end; one end of the connecting screw rod is horizontally passed through the driving cavity, away from the side wall of the integrated module and mounted on a wall body, and the other end is connected with the outer box body; the oil fume driving assembly is arranged on the outer box body. According to the application, the outer box body and the oil fume driving assembly are separated from the main shell, so that vibration of the main shell is not caused during work, and vibration and noise are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of integrated cooker, in particular to a noise reduction integrated cooker. BACKGROUND

[0002] Integrated cooker is a kind of kitchen appliance integrating range hood, gas stove, disinfection cabinet, storage cabinet and other functions, which has the advantages of space saving, good oil smoke extraction effect, energy saving, low consumption and environmental protection.

[0003] The working principle of the range hood module of the integrated cooker is similar to that of the range hood, but the difference is that the oil fume flows from top to bottom. The noise is relatively large during use, and the main sources of noise are two: the first is the sound of the motor and impeller working; the second is the vibration of the machine shell caused by the working of the motor and impeller, which produces noise. SUMMARY

[0004] In order to reduce the noise of the range hood module of the integrated cooker, the present application provides a noise reduction integrated cooker.

[0005] The noise reduction integrated cooker provided by the present application adopts the following technical scheme:

[0006] A noise reduction integrated cooker, comprising a range hood module and an integrated module; the range hood module comprises a main shell and an oil fume driving mechanism; the main shell is L-shaped; the integrated module is detachably fixed on the horizontal part of the main shell; a wind channel is formed in the vertical part of the main shell, and a driving cavity is formed in the horizontal part; a horizontal opening air inlet is formed on the side wall of the wind channel close to the integrated module; the wind channel and the driving cavity are in communication; the oil fume driving mechanism comprises an oil fume driving outer box and an oil fume driving assembly; the oil fume driving assembly is used for extracting oil fume; the oil fume driving outer box comprises an outer box body and four rectangularly distributed connecting screws; the outer box body is provided with an opening at the upper end; one end of the connecting screw passes through the driving cavity horizontally away from the side wall of the integrated module and is installed on the wall, and the other end is connected with the outer box body; the oil fume driving assembly is arranged on the outer box body.

[0007] By adopting the above technical scheme, since the outer box body and the oil fume driving assembly are connected with the cavity through the connecting screw, that is, the outer box body and the oil fume driving assembly are separated from the main shell, the vibration of the main shell caused by the oil fume driving assembly during oil fume extraction will not occur, which plays a role in reducing vibration and reduces noise.

[0008] Optionally, a first buffer is arranged between the end face of the outer box body away from the integrated module and the side wall of the driving cavity away from the integrated module.

[0009] By adopting the technical scheme, the first buffering member is used to absorb the vibration caused by the oil fume driving assembly during operation, thereby facilitating vibration reduction and noise reduction.

[0010] Optionally, the first sound-absorbing plate is arranged on all the side walls of the driving cavity.

[0011] By adopting the technical scheme, the first sound-absorbing plate is used to absorb the sound generated by the oil fume driving assembly during operation, thereby achieving the effect of noise reduction.

[0012] Optionally, the second buffering member is arranged on the end face of the main shell away from the integrated module.

[0013] By adopting the technical scheme, the second buffering member is arranged between the main shell and the wall, thereby weakening the vibration transmission between the main shell and the wall, facilitating vibration reduction and noise reduction.

[0014] Optionally, a plurality of guide blocks are evenly distributed in the air duct; the length direction of the guide blocks is parallel to the opening direction of the air inlet and is lower than the air inlet; the guide blocks include an upper guide frame in the shape of a folded plate with sharp corners upward and a second sound-absorbing plate fixed in the lower end opening of the upper guide frame.

[0015] By adopting the technical scheme, the second sound-absorbing plate is used to absorb the sound generated by the oil fume driving assembly during operation, thereby achieving the effect of noise reduction; meanwhile, the upper guide frame is located on the upper side of the second sound-absorbing plate, so that the upper guide frame plays a role in guiding the airflow and protecting the second sound-absorbing plate from being polluted by oil fume.

[0016] Optionally, the upper end of the air duct is provided with an upper connecting plate, and the lower part is provided with an air guide sleeve with an upper and lower opening; the upper connecting plate abuts against the four side walls of the air duct; the upper end of the air guide sleeve abuts against the four side walls of the air duct; the upper connecting plate is arranged obliquely, and the end close to the air inlet is higher than the air inlet, and the end away from the air inlet is opposite to the air inlet; the air guide sleeve is lower than the guide blocks.

[0017] By adopting the technical scheme, the existence of the upper connecting plate, the guide blocks and the air guide sleeve makes the air duct stronger, thereby facilitating the reduction of the vibration of the side walls of the air duct caused by the airflow, thereby facilitating vibration reduction and noise reduction.

[0018] Optionally, the air guide sleeve and the four side walls of the air duct are filled with sound-absorbing cotton.

[0019] By adopting the technical scheme, the sound-absorbing cotton is used to absorb the sound generated by the oil fume driving assembly during operation, thereby achieving the effect of noise reduction.

[0020] Optionally, a vertical connecting piece is arranged between the air guide sleeve and the outer box body; the vertical connecting piece comprises a rectangular frame-shaped upper connecting frame fixed on the air guide sleeve, a rectangular frame-shaped lower connecting frame fixed on the outer box body, and a buffer sleeve fixed between the upper connecting frame and the lower connecting frame.

[0021] By adopting the above technical scheme, the vertical connecting piece can prevent the oil fume from overflowing, and the buffer sleeve of the vertical connecting piece can weaken the vibration of the air guide sleeve caused by the vibration of the outer box body, thereby facilitating vibration reduction and noise reduction.

[0022] Optionally, the outer box body comprises a box body support frame and a box body cover; the box body support frame is L-shaped; the box body cover is arranged on the end face of the vertical part of the box body support frame close to the integrated module and is provided with a third buffer piece therebetween; the oil fume driving assembly comprises an oil fume driving motor, a volute and a centrifugal impeller; the oil fume driving motor is fixed on the horizontal part of the box body support frame and is provided with a fourth buffer piece therebetween; the volute is fixed in the box body cover; the centrifugal impeller is rotationally connected in the volute and is fixedly connected with the output shaft of the oil fume driving motor.

[0023] By adopting the above technical scheme, the vibration caused by the oil fume driving motor and the volute can be weakened when transmitted to the box body support frame through the third buffer piece and the fourth buffer piece, thereby facilitating vibration reduction and noise reduction.

[0024] Optionally, a plurality of support feet are arranged on the lower end face of the horizontal part of the box body support frame; the bottom of each support foot is provided with a rubber pad; a plurality of lower through holes for the support feet to vertically pass through are formed on the lower side wall of the driving cavity; and the rubber pad abuts against the ground.

[0025] By adopting the above technical scheme, the support feet serve as auxiliary support for the box body support frame, and the support feet abut against the ground through the rubber pads, thereby facilitating vibration reduction.

[0026] In summary, the beneficial effects of the present application are as follows:

[0027] 1. By separating the outer box body and the oil fume driving assembly from the main shell, the vibration of the main shell caused by the oil fume driving assembly when working to extract oil fume is avoided, thereby reducing noise.

[0028] 2. The strength of the air duct is enhanced by the upper connecting plate, the guide block and the air guide sleeve, thereby facilitating the reduction of the vibration of the side wall of the air duct caused by the airflow, thereby facilitating vibration reduction and noise reduction. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic view of a cross section of the present application.

[0030] Figure 2 is a structural schematic view of a section of the guiding block 13 of the present application. Figure 1

[0031] Figure 3 is a structural schematic view of a section of the guiding block 13 of the present application.

[0032] Figure 4 is a structural schematic view of a section of the vertical connecting piece 70 of the present application.

[0033] Figure 5 is a structural schematic view of a section of the oil fume driving mechanism of the present application.

[0034] Figure 6 is a structural schematic view of a section of the oil fume driving mechanism of the present application. Figure 5 is a structural schematic view of a section of the oil fume driving mechanism of the present application.

[0035] Figure 7 is a structural schematic view of a section of the oil fume driving mechanism of the present application. Figure 6 is a structural schematic view of a section of the oil fume driving mechanism of the present application.

[0036] Explanation of reference signs:

[0037] 10, main shell; 100, air inlet; 101, air duct; 102, driving cavity; 11, horizontally extending plate; 12, upper connecting plate; 13, guiding block; 131, upper flow guide frame; 132, second sound absorbing plate; 14, first sound absorbing plate; 15, second buffer block;

[0038] 20, integrated frame;

[0039] 30, gas stove;

[0040] 40, disinfection cabinet;

[0041] 50, air guide sleeve; 51, upper fixed frame;

[0042] 60, sound absorbing cotton;

[0043] 70, vertical connecting piece; 71, upper connecting frame; 72, buffer sleeve; 73, lower connecting frame;

[0044] 80, oil fume driving outer shell; 81, shell support frame; 810, avoiding groove; 811, reinforcing plate; 812, supporting leg; 813, rubber pad; 814, connecting slot; 82, shell cover; 821, connecting plate; 83, first buffer block; 84, motor support frame; 85, connecting screw; 86, buffer washer; 87, connecting nut; 88, compression spring;

[0045] 90, oil fume driving assembly; 91, oil fume driving motor; 92, volute; 93, centrifugal impeller; 94, smoke exhaust joint; 95, smoke exhaust pipe. DETAILED DESCRIPTION​

[0046] The application will be further described below in conjunction with the accompanying drawings Figures 1-7 The application will be further described below in conjunction with the accompanying drawings

[0047] The application discloses a noise-reducing integrated cooker, which refers to Figure 1 , comprising an oil fume extractor module and an integrated module; the oil fume extractor module comprises a main shell 10 and an oil fume driving mechanism; the oil fume driving mechanism is used for extracting oil fume; the integrated module comprises an integrated frame 20, a gas stove 30 and a sterilization cabinet 40; the main shell 10 is in an L shape; the integrated frame 20 is connected to one end of the horizontal part of the main shell 10 away from the wall body through bolts; the gas stove 30 and the sterilization cabinet 40 are installed on the integrated frame 20.

[0048] The application discloses a noise-reducing integrated cooker, which refers to Figure 1 and Figure 2 The vertical part of the main shell 10 is internally profiled with a rectangular slot-shaped air duct 101, and the horizontal part is internally profiled with a rectangular slot-shaped driving cavity 102; the air duct 101 communicates with the driving cavity 102; the air duct 101 is profiled with a horizontal air inlet 100 on the side wall close to the integrated module; the vertical part of the main shell 10 is profiled with a horizontal extension plate 11 on the end face close to the integrated module; the horizontal extension plate 11 is higher than the air inlet 100; the first sound-absorbing plate 14 is fixed on the six side walls of the driving cavity 102.

[0049] The application discloses a noise-reducing integrated cooker, which refers to Figures 1-3 The top of the air duct 101 is fixed with an upper connecting plate 12 which is arranged in an inclined manner; the upper connecting plate 12 abuts against the four side walls of the air duct 101; one end of the upper connecting plate 12 close to the air inlet 100 is higher than the other end away from the air inlet 100; the upper end of the upper connecting plate 12 is higher than the air inlet 100 and the lower end is opposite to the air inlet 100; the middle part of the air duct 101 is fixed with a plurality of evenly distributed guide blocks 13; the length direction of the guide blocks 13 is parallel to the opening direction of the air inlet 100; the guide blocks 13 are lower than the air inlet 100; the guide blocks 13 comprise an upper guide flow frame 131 in the shape of a folded plate with the sharp corners upward and a second sound-absorbing plate 132 fixed in the opening at the lower end of the upper guide flow frame 131; the lower part of the air duct 101 is provided with an air guide sleeve 50 which is open upward and downward; the upper part of the air guide sleeve 50 is in the shape of a rectangular frame, the middle part is in the shape of a trapezoidal platform with the upper part wider than the lower part, and the lower part is in the shape of a rectangular frame; the upper end of the air guide sleeve 50 is fixed in the air duct 101 and abuts against the four side walls of the air duct 101; the four side walls of the air duct 101 are filled with sound-absorbing cotton 60; the inner side lines of the upper end face of the air guide sleeve 50 are chamfered.

[0050] In the above structure, the upper connecting plate 12, the guide block 13, and the air guide sleeve 50 support the entire air duct 101, making the overall strength of the air duct 101 greater and less prone to vibration; at the same time, the upper connecting plate 12 plays a guiding role; the upper air guide frame 131 on the upper side of the guide block 13 plays a guiding role, while the second sound-absorbing plate 132 on the lower side of the second sound-absorbing plate 132 plays a noise-absorbing role; the air guide sleeve 50 plays a guiding role, and the sound-absorbing cotton 60 plays a noise-absorbing role.

[0051] refer to Figure 1 , Figures 5-7 The fume driving mechanism includes a fume driving outer casing 80 and a fume driving assembly 90. The fume driving outer casing 80 includes an outer casing body and four rectangularly distributed connecting screws 85. One end of the connecting screw 85 passes horizontally through the side wall of the driving cavity 102 away from the integrated module and is installed on the wall, while the other end is connected to the outer casing body. The fume driving assembly 90 is disposed on the outer casing body. A second buffer is disposed on the end face of the main housing 10 away from the integrated module. The second buffer includes a second buffer block 15 fixed on the end face of the main housing 10 away from the integrated module. The second buffer block 15 is made of rubber.

[0052] The outer casing and the fume drive assembly 90 are connected to the wall by four connecting screws 85. This prevents the vibration generated by the fume drive assembly 90 during operation from being transmitted to the main casing 10, thereby reducing the vibration of the integrated stove and achieving noise reduction. The second buffer block 15 is set between the main casing 10 and the main casing 10, which makes the vibration reduction effect even better.

[0053] refer to Figures 5-7 The outer casing body includes a casing support frame 81 and a casing cover 82; the casing support frame 81 is L-shaped; several clearance grooves 810 are formed on the horizontal part of the casing support frame 81; the casing cover 82 is a rectangular shell with an opening at the top and an opening at one end near the casing support frame 81; the vertical part of the casing support frame 81 has four internal connection holes for the connecting screws 85 to pass through horizontally; a pair of vertically distributed connecting plates 821 are formed on a pair of opposite end faces of the casing cover 82 perpendicular to the vertical part of the casing cover 82; the connecting plates 821 correspond one-to-one with the connecting screws 85 and have external connection holes for the connecting screws 85 to pass through horizontally; the connecting screws 85 pass through the side wall of the drive cavity 102 away from the integrated module, the internal connection holes and the external connection holes in sequence and are screwed with connecting nuts 87.

[0054] refer to Figures 5-7 To reduce vibration, a third buffer is provided between the vertical part of the housing 82 and the housing support frame 81; a first buffer is provided on the end face of the vertical part of the housing support frame 81 away from the integrated module.

[0055] refer to Figures 5-7The third buffer member includes four compression springs 88 and buffer washers 86 sleeved on the connecting screw 85 respectively. One end of the compression spring 88 abuts against the connecting plate 821, and the other end abuts against the vertical part of the box supporting frame 81. The vertical part of the box supporting frame 81 is close to the end face of the integrated module, and a connecting slot 814 for horizontally inserting the box cover 82 is formed on the end face. The buffer washer 86 is inserted into the connecting slot 814, and the buffer washer 86 is located between the box cover 82 and the inner side wall of the connecting slot 814. The buffer washer 86 is made of rubber.

[0056] With reference to Figure 5 and Figure 7 The first buffer member includes a plurality of first buffer blocks 83 fixed on the vertical part of the box supporting frame 81 away from the end face of the integrated module and distributed upward and downward. The first buffer block 83 is made of rubber.

[0057] The compression spring 88, the buffer washer 86 and the first buffer block 83 can all weaken the vibration of the box cover 82 transmitted to the main shell 10, which is conducive to vibration reduction. Of course, all of them are provided, and the effect of weakening the vibration of the box cover 82 transmitted to the main shell 10 is better.

[0058] In order to increase the strength of the box supporting frame 81, a plurality of reinforcing plates 811 are arranged between the vertical part and the horizontal part of the box supporting frame 81. A plurality of support feet 812 are fixed on the lower end face of the horizontal part of the box supporting frame 81 and are uniformly distributed. In order to reduce vibration, rubber pads 813 are fixed on the bottom of the support feet 812. A plurality of lower through holes are formed on the lower side wall of the driving cavity 102 for the support feet 812 to vertically pass through. The rubber pad 813 abuts against the ground.

[0059] With reference to Figure 5 and Figure 7 The oil fume driving assembly 90 includes an oil fume driving motor 91, a volute 92 and a centrifugal impeller 93. The motor supporting frame 84 is fixed on the horizontal part of the box supporting frame 81 by bolts. The fourth buffer member is arranged between the horizontal part of the box supporting frame 81 and the motor supporting frame 84. The fourth buffer member includes a plurality of fourth buffer blocks. The fourth buffer block is made of rubber. The volute 92 is fixed in the box cover 82. The centrifugal impeller 93 is rotatably connected in the volute 92 and is fixedly connected with the output shaft of the oil fume driving motor 91. The air inlet end of the volute 92 is located on the end face of the volute 92 close to the vertical part of the box supporting frame 81, and an air inlet gap is arranged between the volute 92 and the vertical part of the box supporting frame 81. The smoke exhaust joint 94 is fixed on the box cover 82. The smoke exhaust joint 94 is opposite to the air outlet end of the volute 92, and the part between the smoke exhaust joint 94 and the box cover 82 is formed with a horizontally opened smoke exhaust hole. The smoke exhaust pipe 95 is connected to the end of the smoke exhaust joint 94 away from the box cover 82.

[0060] The presence of the fourth buffer block weakens the vibration transmitted to the box support frame 81 when the motor is working.

[0061] For the convenience of subsequent maintenance, the driving cavity 102 is horizontally opened at the end close to the integrated module, and the first sound-absorbing plate 14 is fixed on the end face of the integrated frame 20 close to the driving cavity 102, so that the six side walls of the driving cavity 102 are all fixed with the first sound-absorbing plate 14.

[0062] Reference Figure 1 , Figure 2 and Figure 4 , a vertical connecting piece 70 is arranged between the outer box body and the air guide sleeve 50; a rectangular frame-shaped upper fixed frame 51 is formed on the outer side wall of the lower part of the air guide sleeve 50; the vertical connecting piece 70 comprises a rectangular frame-shaped upper connecting frame 71, a rectangular frame-shaped lower connecting frame 73 and a buffer sleeve 72 fixed between the upper connecting frame 71 and the lower connecting frame 73; the upper connecting frame 71 is fixed on the lower end face of the upper fixed frame 51 by bolts; the lower connecting frame 73 is fixed on the upper end face of the outer box body by bolts; the lower end of the air guide sleeve 50 is located in the buffer sleeve 72; the buffer sleeve 72 is in the shape of a rectangular frame and its side wall is in the shape of a fold line; the buffer sleeve 72 is made of rubber.

[0063] The buffer sleeve 72 can be extruded, so that the vibration transmitted from the outer box body to the air guide sleeve 50 is weakened.

[0064] The working principle of the noise-reducing integrated cooker of the present application is as follows:

[0065] When the range hood module of the integrated cooker is working, the oil fume driving motor 91 drives the centrifugal impeller 93 to rotate, so that air flow is generated, and the oil fume generated during cooking passes through the air inlet 100, the air duct 101 and the volute 92 in turn, part of the oil is condensed in the volute 92, and a small part of the smoke and oil is discharged along the smoke exhaust joint 94 and the smoke exhaust pipe 95;

[0066] During this process, the driving motor 91 and the centrifugal impeller 93 generate noise and vibrate the outer box body composed of the box support frame 81 and the box cover 82, and since the oil fume driving assembly 90 is arranged on the outer box body, and the outer box body is connected to the wall through the four connecting screws 85, the vibration generated by the driving motor 91 and the centrifugal impeller 93 is guided to the wall, so that the vibration of the integrated cooker is not caused, and the vibration and noise reduction effects are achieved;

[0067] The noise generated by the driving motor 91 and the centrifugal impeller 93 is absorbed by the second sound-absorbing plate 132, the first sound-absorbing plate 14 and the sound-absorbing cotton 60, so that the noise reduction effect is effectively achieved.

[0068] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A noise-reducing integrated stove, characterized by: The oil fume machine module and the integrated module are included; the oil fume machine module includes a main shell (10) and an oil fume driving mechanism; the main shell (10) is L-shaped; the integrated module is detachably fixed on the horizontal part of the main shell (10); the vertical part of the main shell (10) is formed with an air duct (101) and the horizontal part is formed with a driving cavity (102); the air duct (101) is formed with a horizontal opening air inlet (100) on the side wall close to the integrated module; the air duct (101) and the driving cavity (102) are in communication; the oil fume driving mechanism includes an oil fume driving outer box (80) and an oil fume driving assembly (90); the oil fume driving assembly (90) is used for extracting oil fume; the oil fume driving outer box (80) includes an outer box body and four rectangularly distributed connecting screws (85); the outer box body is provided with an opening at the upper end; one end of the connecting screw (85) passes through the driving cavity (102) horizontally away from the side wall of the integrated module and is installed on the wall, and the other end is connected with the outer box body; the oil fume driving assembly (90) is arranged on the outer box body; A plurality of evenly distributed guide blocks (13) are arranged in the air duct (101); the length direction of the guide block (13) is parallel to the opening direction of the air inlet (100) and is lower than the air inlet (100); the guide block (13) includes an upper guide frame (131) in the shape of a gusset with the sharp corner upward and a second sound absorbing plate (132) fixed in the opening at the lower end of the upper guide frame (131); The upper end of the air duct (101) is provided with an upper connecting plate (12), and the lower part is provided with an up-down opening air guide sleeve (50); the upper connecting plate (12) abuts against the four side walls of the air duct (101); the upper end of the air guide sleeve (50) abuts against the four side walls of the air duct (101); the upper connecting plate (12) is arranged obliquely, and the end close to the air inlet (100) is higher than the air inlet (100), and the end away from the air inlet (100) is opposite to the air inlet (100); the air guide sleeve (50) is lower than the guide block (13); A vertical connecting piece (70) is arranged between the air guide sleeve (50) and the outer box body; the vertical connecting piece (70) includes a rectangular frame-shaped upper connecting frame (71) fixed on the air guide sleeve (50), a rectangular frame-shaped lower connecting frame (73) fixed on the outer box body, and a buffer sleeve (72) fixed between the upper connecting frame (71) and the lower connecting frame (73).

2. The integrated cooker of claim 1, wherein: A first buffer is arranged between the end face of the outer box body away from the integrated module and the side wall of the driving cavity (102) away from the integrated module.

3. The integrated cooker of claim 1, wherein: First sound absorbing plates (14) are arranged on all the side walls of the driving cavity (102).

4. The integrated cooker of claim 1, wherein: A second buffer is arranged on the end face of the main shell (10) away from the integrated module.

5. The integrated cooker of claim 1, wherein: Sound absorbing cotton (60) is filled between the air guide sleeve (50) and the four side walls of the air duct (101).

6. The integrated range hood of claim 1, wherein: The outer box body comprises a box support frame (81) and a box cover (82); the box support frame (81) is L-shaped; the box cover (82) is arranged on the end face of the vertical part of the box support frame (81) close to the integrated module and a third buffer is arranged therebetween; the oil fume driving assembly (90) comprises an oil fume driving motor (91), a volute (92) and a centrifugal impeller (93); the oil fume driving motor (91) is fixed on the horizontal part of the box support frame (81) and a fourth buffer is arranged therebetween; the volute (92) is fixed in the box cover (82); the centrifugal impeller (93) is rotatably connected in the volute (92) and the centrifugal impeller (93) is fixedly connected with the output shaft of the oil fume driving motor (91).

7. The noise-reducing integrated stove of claim 6, wherein: The lower end face of the horizontal part of the box support frame (81) is provided with a plurality of supporting feet (812); the bottom of the supporting feet (812) is provided with a rubber pad (813); the lower side wall of the driving cavity (102) is formed with a plurality of lower through holes for the vertical passing of the supporting feet (812); the rubber pad (813) abuts against the ground.

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