CN111136507A

CN111136507A - Machine tool cooling liquid filtering and recycling device

Info

Publication number: CN111136507A
Application number: CN202010055871.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Ningbo Aiya Machinery Equipment Co Ltd
Current assignee: Ningbo Aiya Machinery Equipment Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-05-12

Abstract

The invention discloses a machine tool cooling liquid filtering and recycling device, which comprises a base body, wherein a movable cavity is arranged in the base body, a reciprocating mechanism is arranged in the moving cavity, a first rectangular groove is arranged on the right side of the moving cavity, a second rectangular groove is arranged above the first rectangular groove, a first driving shaft is rotatably arranged between the second rectangular groove and the first rectangular groove, the upper end of the first driving shaft extends into the second rectangular groove and is fixedly provided with a first belt wheel, the lower end of the first driving shaft extends into the first rectangular groove and is fixedly provided with a first bevel gear, a third rectangular groove is arranged at the rear side of the first rectangular groove, a second driving shaft is rotatably arranged between the third rectangular groove and the first rectangular groove, the front end of the second driving shaft extends into the first rectangular groove and is fixedly provided with a second bevel gear meshed with the first bevel gear.

Description

Machine tool cooling liquid filtering and recycling device

Technical Field

The invention relates to the field of machine tools, in particular to a machine tool cooling liquid filtering and recycling device.

Background

Machine tools are machines for manufacturing machines, also called machine tools or machine tools, and are conventionally called machine tools for short, and generally include metal cutting machines, forging machines, woodworking machines, and the like. The cutter of lathe processing can produce very high heat when cutting the work piece, can influence the hardness of cutter if can not cool down for a long time, causes the machining precision to descend, and the cutter damages even, just at this moment just needs a large amount of cutting coolant liquid to last for the cutter cooling when processing, but most coolant liquid all only once uses at present just discharge the processing region, has not only caused the waste of resource, has increased the processing cost, still can make the environment receive pollution and destruction.

Disclosure of Invention

Aiming at the technical defects, the invention provides a machine tool cooling liquid filtering and recycling device which can overcome the defects.

The invention relates to a machine tool cooling liquid filtering and recycling device, which comprises a base body, wherein a moving cavity is arranged in the base body, a reciprocating mechanism is arranged in the moving cavity, a first rectangular groove is arranged on the right side of the moving cavity, a second rectangular groove is arranged above the first rectangular groove, a first driving shaft is rotatably arranged between the second rectangular groove and the first rectangular groove, the upper end of the first driving shaft extends into the second rectangular groove and is fixedly provided with a first belt wheel, the lower end of the first driving shaft extends into the first rectangular groove and is fixedly provided with a first bevel gear, a third rectangular groove is arranged on the rear side of the first rectangular groove, a second driving shaft is rotatably arranged between the third rectangular groove and the first rectangular groove, the front end of the second driving shaft extends into the first rectangular groove and is fixedly provided with a second bevel gear meshed with the first bevel gear, the second bevel gear rear end stretches into in the third rectangular channel and the fixed second band pulley that is equipped with, third rectangular channel front side be equipped with remove the communicating transfer chamber in chamber, be equipped with transport mechanism in the transfer chamber, it is equipped with rather than communicating filter chamber to remove the chamber below, be equipped with filter equipment in the filter chamber, the filter chamber left side is equipped with the driving groove, the driving groove left side is equipped with the chamber of admitting air, the filter chamber below is equipped with the heat dissipation chamber, be equipped with heat dissipation mechanism in the heat dissipation chamber, heat dissipation chamber below is equipped with the fourth rectangular channel.

Preferably, the reciprocating mechanism comprises a first power shaft rotatably mounted in the base body and penetrating through the second rectangular groove, the upper end of the first power shaft extends into the base body and is provided with a first motor in a power mode, a third belt wheel fixedly connected with the first power shaft is arranged in the second rectangular groove, the third belt wheel is in power connection with the first belt wheel through a first belt, the lower end of the first power shaft extends into the moving cavity and is fixedly provided with a connecting rod, the lower end of the connecting rod is fixedly provided with a fixed shaft, fixed plates are fixedly arranged in the left wall body and the right wall body of the moving cavity, a cross-shaped sliding groove is formed in each fixed plate, a sliding block is slidably arranged in the cross-shaped sliding groove, a first connecting plate and a second connecting plate are fixedly arranged at the upper end of each sliding block, and a roller rotatably connected with the fixed shaft is slidably arranged between the first connecting plate and the second connecting plate, the electric push rod is fixedly arranged at the lower end of the sliding block, the mounting block is fixedly arranged at the lower end of the electric push rod, and the electromagnet is fixedly arranged at the lower end of the mounting block.

Preferably, transport mechanism installs including rotating the third rectangular channel with third drive shaft between the transfer chamber, third drive shaft rear end stretches into in the third rectangular channel and the fixed fourth band pulley that is equipped with, the fourth band pulley with connect through second belt power between the second band pulley, third drive shaft front end stretches into in the transfer chamber and the fixed fifth band pulley that is equipped with, it is equipped with the fourth drive axle to rotate in the wall body around the transfer chamber, be equipped with in the transfer chamber with fourth drive axle fixed connection's sixth band pulley, the sixth band pulley with connect through conveyer belt power between the fifth band pulley, the transfer chamber right side is equipped with stores up the bits groove.

Preferably, the filter mechanism comprises a fifth drive shaft rotatably mounted between the filter chamber and the fourth rectangular groove, the upper end of the fifth drive shaft extends into the filter chamber and is fixedly provided with a first gear, the lower end of the fifth drive shaft extends into the fourth rectangular groove and is fixedly provided with a seventh belt pulley, a mounting plate is fixedly arranged between the filter chamber and the heat dissipation chamber, a filter box is rotatably arranged in the mounting plate, a leak hole is formed in the lower end wall body of the filter box, the filter chamber is arranged in the filter box, a first filter plate is fixedly arranged in the filter box, a second filter plate is fixedly arranged at the lower end of the filter box, a fluted disc meshed with the first gear is fixedly arranged on the outer wall of the filter box, a liquid inlet pipe communicated with the outside is fixedly arranged in the base body, and the right end of the liquid inlet pipe extends into the movable chamber.

Preferably, the heat dissipation mechanism comprises a second power shaft rotatably mounted in the base body and penetrating through the fourth rectangular groove, the lower end of the second power shaft extends into the base body and is provided with a second motor in a power mode, an eighth belt pulley fixedly connected with the second power shaft is arranged in the fourth rectangular groove, the eighth belt pulley is in power connection with the seventh belt pulley through a third belt, the upper end of the second power shaft extends into the heat dissipation chamber and is fixedly provided with a stirring frame, a stirring rod is fixedly arranged in the stirring frame, the lower end of the heat dissipation chamber is fixedly provided with a valve, a sixth driving shaft is rotatably arranged between the filtering chamber and the transmission groove, the upper end of the sixth driving shaft extends into the filtering chamber and is fixedly provided with a second gear meshed with the fluted disc, and the lower end of the sixth driving shaft extends into the transmission groove and is fixedly provided with a third bevel gear, a seventh driving shaft is rotatably arranged between the air inlet cavity and the transmission groove, the left end of the seventh driving shaft extends into the air inlet cavity and is fixedly provided with a fan, the right end of the seventh driving shaft extends into the transmission groove and is fixedly provided with a fourth bevel gear meshed with the third bevel gear, the air inlet cavity is communicated with the heat dissipation cavity through an air inlet pipe, and the heat dissipation cavity is communicated with the outside through an air outlet pipe.

The beneficial effects are that: the device can carry out filtering and impurity removing treatment and heat dissipation treatment on the used cooling liquid, is convenient for recycling the used cooling liquid, and is beneficial to saving energy and protecting the environment; in addition, the cooling mechanism is arranged in the cooling device and used for stirring and cooling the filtered cooling liquid, and the cooling mechanism can enable the filtered cooling liquid to perform rotational flow motion, so that the cooling efficiency of the cooling liquid is improved conveniently.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of the present embodiment;

FIG. 2 is an enlarged view of the structure at A-A in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is an enlarged view of the structure at B-B in FIG. 1 according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of the structure at C in FIG. 1 according to an embodiment of the present invention;

fig. 5 is an enlarged schematic view of the structure at D in fig. 1 according to the embodiment of the present invention.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The invention will now be described in detail with reference to fig. 1-5, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The machine tool coolant filtering and recycling device comprises a base body 10, wherein a moving cavity 54 is arranged in the base body 10, a reciprocating mechanism 101 is arranged in the moving cavity 54, a first rectangular groove 43 is arranged on the right side of the moving cavity 54, a second rectangular groove 51 is arranged above the first rectangular groove 43, a first driving shaft 48 is rotatably arranged between the second rectangular groove 51 and the first rectangular groove 43, the upper end of the first driving shaft 48 extends into the second rectangular groove 51 and is fixedly provided with a first belt pulley 47, the lower end of the first driving shaft 48 extends into the first rectangular groove 43 and is fixedly provided with a first bevel gear 49, the rear side of the first rectangular groove 43 is provided with a third rectangular groove 63, a second driving shaft 46 is rotatably arranged between the third rectangular groove 63 and the first rectangular groove 43, the front end of the second driving shaft 46 extends into the first rectangular groove 43 and is fixedly provided with a second bevel gear 45 meshed with the first bevel gear 49, the rear end of the second bevel gear 45 extends into in the third rectangular channel 63 and the fixed second band pulley 44 that is equipped with, third rectangular channel 63 front side be equipped with remove communicating transfer chamber 42 in chamber 54, be equipped with transport mechanism 102 in the transfer chamber 42, it is equipped with rather than communicating filter chamber 16 to remove chamber 54 below, be equipped with filter mechanism 103 in the filter chamber 16, the filter chamber 16 left side is equipped with drive groove 17, the drive groove 17 left side is equipped with air inlet chamber 15, the filter chamber 16 below is equipped with heat dissipation chamber 20, be equipped with heat dissipation mechanism 104 in the heat dissipation chamber 20, the heat dissipation chamber 20 below is equipped with fourth rectangular channel 28.

Advantageously, the reciprocating mechanism 101 includes a first power shaft 52 rotatably mounted in the base 10 and passing through the second rectangular groove 51, an upper end of the first power shaft 52 extends into the base 10 and is provided with a first motor 75, a third pulley 74 fixedly connected to the first power shaft 52 is disposed in the second rectangular groove 51, the third pulley 74 is in power connection with the first pulley 47 through a first belt 50, a lower end of the first power shaft 52 extends into the moving cavity 54 and is fixedly provided with a connecting rod 61, a fixed shaft 60 is fixedly provided at a lower end of the connecting rod 61, a fixed plate 55 is fixedly provided in the left and right walls of the moving cavity 54, a cross-shaped sliding groove 53 is provided in the fixed plate 55, a sliding block 56 is slidably provided in the cross-shaped sliding groove 53, a first connecting plate 57 and a second connecting plate 58 are fixedly provided at an upper end of the sliding block 56, and a first connecting plate 57 and a second connecting plate 58 are slidably provided between the first connecting plate 57 and the second connecting plate 58 and are rotatably connected to the fixed shaft 60 The lower end of the sliding block 56 is fixedly provided with an electric push rod 11, the lower end of the electric push rod 11 is fixedly provided with an installation block 13, and the lower end of the installation block 13 is fixedly provided with an electromagnet 14.

Advantageously, the transmission mechanism 102 includes a third driving shaft 38 rotatably mounted between the third rectangular groove 63 and the transmission cavity 42, a rear end of the third driving shaft 38 extends into the third rectangular groove 63 and is fixedly provided with a fourth pulley 62, the fourth pulley 62 is in power connection with the second pulley 44 through a second belt 64, a front end of the third driving shaft 38 extends into the transmission cavity 42 and is fixedly provided with a fifth pulley 37, a front wall and a rear wall of the transmission cavity 42 are rotatably provided with a fourth driving shaft 41, the transmission cavity 42 is provided with a sixth pulley 40 fixedly connected with the fourth driving shaft 41, the sixth pulley 40 is in power connection with the fifth pulley 37 through a transmission belt 36, and a scrap storage groove 39 is formed at the right side of the transmission cavity 42.

Advantageously, the filtering mechanism 103 comprises a fifth driving shaft 30 rotatably mounted between the filtering chamber 16 and the fourth rectangular groove 28, the upper end of the fifth driving shaft 30 extends into the filtering chamber 16 and is fixedly provided with a first gear 35, the lower end of the fifth driving shaft 30 extends into the fourth rectangular groove 28 and is fixedly provided with a seventh pulley 29, a mounting plate 19 is fixedly arranged between the filtering chamber 16 and the heat dissipation chamber 20, a filtering box 33 is rotatably arranged in the mounting plate 19, a leakage hole 70 is arranged in the lower end wall body of the filtering box 33, a filtering chamber 31 is arranged in the filtering box 33, a first filtering plate 34 is fixedly arranged in the filtering box 33, a second filtering plate 32 is fixedly arranged at the lower end of the filtering box 33, a fluted disc 69 engaged with the first gear 35 is fixedly arranged on the outer wall of the filtering box 33, an inlet pipe 12 communicated with the outside is fixedly arranged in the base body 10, the right end of the liquid inlet pipe 12 extends into the moving cavity 54.

Advantageously, the heat dissipating mechanism 104 includes a second power shaft 24 rotatably mounted in the base body 10 and penetrating through the fourth rectangular groove 28, a lower end of the second power shaft 24 extends into the base body 10 and is provided with a second motor 25, the fourth rectangular groove 28 is provided with an eighth belt pulley 26 fixedly connected with the second power shaft 24, the eighth belt pulley 26 is connected with the seventh belt pulley 29 by a third belt 27, an upper end of the second power shaft 24 extends into the heat dissipating chamber 20 and is fixedly provided with a stirring frame 23, a stirring rod 22 is fixedly provided in the stirring frame 23, a valve 21 is fixedly provided at a lower end of the heat dissipating chamber 20, a sixth driving shaft 67 is rotatably provided between the filter chamber 16 and the transmission groove 17, an upper end of the sixth driving shaft 67 extends into the filter chamber 16 and is fixedly provided with a second gear 68 engaged with the fluted disc 69, the lower end of the sixth driving shaft 67 extends into the transmission groove 17 and is fixedly provided with a third bevel gear 66, a seventh driving shaft 73 is rotatably arranged between the air inlet cavity 15 and the transmission groove 17, the left end of the seventh driving shaft 73 extends into the air inlet cavity 15 and is fixedly provided with a fan 65, the right end of the seventh driving shaft 73 extends into the transmission groove 17 and is fixedly provided with a fourth bevel gear 72 meshed with the third bevel gear 66, the air inlet cavity 15 is communicated with the heat dissipation cavity 20 through an air inlet pipe 18, and the heat dissipation cavity 20 is communicated with the outside through an air outlet pipe 76.

In the initial state, the electromagnet 14 is located at the left end position of the moving cavity 54, the electric push rod 11 is in a natural state, and the valve 21 is in a closed state;

when the cooling machine starts working, an operator sends the used cooling liquid into the filter chamber 31 through the liquid inlet pipe 12, because the primary filtering of the first filter plate 34 can separate the residual iron filings in the cooling liquid from the cooling liquid, the separated iron filings are left on the first filter plate 34, at this time, the second motor 25 is controlled to be started in the forward direction, the second motor 25 can drive the eighth belt wheel 26 to rotate through the second power shaft 24, the eighth belt wheel 26 can drive the seventh belt wheel 29 to rotate through the third belt 27, the seventh belt wheel 29 can drive the first gear 35 to rotate through the fifth driving shaft 30, the first gear 35 can drive the filter box 33 to rotate through the fluted disc 69, thereby the cooling liquid can be filtered for the second time, and the second filter plate 32 can filter out the fine impurities in the cooling liquid, the filtered coolant enters the heat dissipation chamber 20 through the weep hole 70, the second power shaft 24 can drive the stirring rod 22 to rotate through the stirring frame 23, so that the coolant in the heat dissipation chamber 20 can be stirred to accelerate cooling, the fluted disc 69 can drive the sixth driving shaft 67 to rotate through the second gear 68, the sixth driving shaft 67 can drive the fourth bevel gear 72 to rotate through the third bevel gear 66, the fourth bevel gear 72 can drive the fan 65 to rotate through the seventh driving shaft 73, the fan 65 can introduce air into the heat dissipation chamber 20 through the air inlet pipe 18, hot air generated in the stirring process is exhausted to the outside through the air outlet pipe 76, and the valve 21 can be opened to take out the coolant after heat dissipation is completed.

When the iron chips remained on the first filter plate 34 need to be cleaned, firstly, the electric push rod 11 is controlled to extend and the electromagnet 14 is powered on, the electric push rod 11 can drive the electromagnet 14 to move downwards to the upper part of the filter box 33 through the mounting block 13, the electromagnet 14 can adsorb the remained iron chips, the return stroke of the electric push rod 11 is controlled after the adsorption is completed, at this time, the first motor 75 is controlled to be started in the forward direction, the first motor 75 can drive the connecting rod 61 to rotate through the first power shaft 52, the connecting rod 61 can drive the roller 59 to rotate around the first power shaft 52 through the fixed shaft 60, the first power shaft 52 can drive the sliding block 56 to reciprocate left and right in the cross-shaped chute 53 through the first connecting plate 57 and the second connecting plate 58, and the sliding block 56 can drive the mounting block 13 to reciprocate left and right through the electric push rod 11, the mounting block 13 can drive the electromagnet 14 to reciprocate left and right, when the electromagnet 14 moves to the right above the conveyor belt 36, the electromagnet 14 is controlled to be powered off, the iron filings fall on the conveyor belt 36 due to the self gravity, the third belt wheel 74 can drive the first belt wheel 47 to rotate through the first belt 50, the first belt wheel 47 can drive the first bevel gear 49 to rotate through the first driving shaft 48, the first bevel gear 49 can drive the second driving shaft 46 to rotate through the second bevel gear 45, the second driving shaft 46 can drive the second belt wheel 44 to rotate, the second belt wheel 44 can drive the fourth belt wheel 62 to rotate through the second belt 64, the fourth belt wheel 62 can drive the fifth belt wheel 37 to rotate through the third driving shaft 38, and the fifth belt wheel 37 can drive the conveyor belt 36 to rotate, the conveyor belt 36 can convey the iron pieces into the scrap storage groove 39.

The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.

Claims

1. A machine tool coolant filtering and recycling device comprises a base body, wherein a moving cavity is arranged in the base body, a reciprocating mechanism is arranged in the moving cavity, a first rectangular groove is formed in the right side of the moving cavity, a second rectangular groove is formed above the first rectangular groove, a first driving shaft is rotatably arranged between the second rectangular groove and the first rectangular groove, the upper end of the first driving shaft extends into the second rectangular groove and is fixedly provided with a first belt pulley, the lower end of the first driving shaft extends into the first rectangular groove and is fixedly provided with a first bevel gear, a third rectangular groove is arranged on the rear side of the first rectangular groove, a second driving shaft is rotatably arranged between the third rectangular groove and the first rectangular groove, the front end of the second driving shaft extends into the first rectangular groove and is fixedly provided with a second bevel gear meshed with the first bevel gear, and the rear end of the second bevel gear extends into the third rectangular groove and is fixedly provided with a second belt pulley, the third rectangular channel front side be equipped with remove the communicating transfer chamber in chamber, be equipped with transport mechanism in the transfer chamber, it is equipped with rather than communicating filter chamber to remove the chamber below, be equipped with filtering mechanism in the filter chamber, the filter chamber left side is equipped with the drive groove, the drive groove left side is equipped with the chamber of admitting air, the filter chamber below is equipped with the heat dissipation chamber, be equipped with heat dissipation mechanism in the heat dissipation chamber, heat dissipation chamber below is equipped with the fourth rectangular channel.

2. The machine tool coolant filtering and recycling device of claim 1, wherein: the reciprocating mechanism comprises a first power shaft which is rotatably installed in the base body and penetrates through the second rectangular groove, the upper end of the first power shaft extends into the base body and is provided with a first motor in a power mode, a third belt wheel fixedly connected with the first power shaft is arranged in the second rectangular groove, the third belt wheel is in power connection with the first belt wheel through a first belt, the lower end of the first power shaft extends into the moving cavity and is fixedly provided with a connecting rod, the lower end of the connecting rod is fixedly provided with a fixed shaft, fixed plates are fixedly arranged in the left wall body and the right wall body of the moving cavity, a cross-shaped sliding groove is formed in each fixed plate, a sliding block is arranged in each cross-shaped sliding groove in a sliding mode, a first connecting plate and a second connecting plate are fixedly arranged at the upper end of each sliding block, and a roller rotatably connected with the fixed shaft is arranged between the first connecting plate and the second connecting plate in a sliding mode, the electric push rod is fixedly arranged at the lower end of the sliding block, the mounting block is fixedly arranged at the lower end of the electric push rod, and the electromagnet is fixedly arranged at the lower end of the mounting block.

3. The machine tool coolant filtering and recycling device of claim 2, wherein: transport mechanism installs including rotating third rectangular channel with third drive shaft between the conveying chamber, third drive shaft rear end stretches into in the third rectangular channel and the fixed fourth band pulley that is equipped with, the fourth band pulley with connect through second belt power between the second band pulley, third drive shaft front end stretches into in the conveying chamber and the fixed fifth band pulley that is equipped with, it is equipped with fourth drive shaft to rotate in the wall body around the conveying chamber, be equipped with in the conveying chamber with fourth drive shaft fixed connection's sixth band pulley, the sixth band pulley with connect through conveyer belt power between the fifth band pulley, the conveying chamber right side is equipped with stores up the bits groove.

4. The machine tool coolant filtering and recycling device according to claim 3, wherein: the filter mechanism comprises a fifth driving shaft which is rotatably installed between the filter chamber and the fourth rectangular groove, the upper end of the fifth driving shaft extends into the filter chamber and is fixedly provided with a first gear, the lower end of the fifth driving shaft extends into the fourth rectangular groove and is fixedly provided with a seventh belt pulley, a mounting plate is fixedly arranged between the filter chamber and the heat dissipation chamber, a filter box is rotatably arranged in the mounting plate, a leak hole is formed in the wall body at the lower end of the filter box, the filter chamber is arranged in the filter box, a first filter plate is fixedly arranged in the filter box, a second filter plate is fixedly arranged at the lower end of the filter box, a fluted disc meshed with the first gear is fixedly arranged on the outer wall of the filter box, a liquid inlet pipe communicated with the outside is fixedly arranged in the base body, and the right end of the liquid inlet pipe extends into the movable chamber.

5. The machine tool coolant filtering and recycling device of claim 4, wherein: the heat dissipation mechanism comprises a second power shaft which is rotatably installed in the base body and penetrates through the fourth rectangular groove, the lower end of the second power shaft extends into the base body and is provided with a second motor in a power mode, an eighth belt wheel fixedly connected with the second power shaft is arranged in the fourth rectangular groove, the eighth belt wheel is in power connection with the seventh belt wheel through a third belt, the upper end of the second power shaft extends into the heat dissipation cavity and is fixedly provided with a stirring frame, a stirring rod is fixedly arranged in the stirring frame, the lower end of the heat dissipation cavity is fixedly provided with a valve, a sixth driving shaft is rotatably arranged between the filtering cavity and the transmission groove, the upper end of the sixth driving shaft extends into the filtering cavity and is fixedly provided with a second gear meshed with the fluted disc, and the lower end of the sixth driving shaft extends into the transmission groove and is fixedly provided with a third bevel gear, a seventh driving shaft is rotatably arranged between the air inlet cavity and the transmission groove, the left end of the seventh driving shaft extends into the air inlet cavity and is fixedly provided with a fan, the right end of the seventh driving shaft extends into the transmission groove and is fixedly provided with a fourth bevel gear meshed with the third bevel gear, the air inlet cavity is communicated with the heat dissipation cavity through an air inlet pipe, and the heat dissipation cavity is communicated with the outside through an air outlet pipe.