CN111672604B

CN111672604B - Liquid nitrogen cryogenic crushing device

Info

Publication number: CN111672604B
Application number: CN202010590922.8A
Authority: CN
Inventors: 佟进伟
Original assignee: Chifeng Guanggang Gas Co ltd
Current assignee: Chifeng Guanggang Gas Co.,Ltd.
Priority date: 2020-06-25
Filing date: 2020-06-25
Publication date: 2022-01-21
Anticipated expiration: 2040-06-25
Also published as: CN111672604A

Abstract

The invention discloses a liquid nitrogen cryogenic grinding device, which comprises a grinding box, wherein a material cavity is arranged in the upper surface of the grinding box, a liquid nitrogen cavity positioned in the grinding box is arranged on the right side of the material cavity, a first heat preservation layer is arranged on the outer side of the liquid nitrogen cavity, a first discharge pipe is arranged in the bottom wall of the liquid nitrogen cavity, a second discharge pipe is arranged in the bottom wall of the material cavity, a clamping cavity penetrates through the middle of the first discharge pipe and the second discharge pipe, automatic batch adding and deep freezing of materials are realized, then the materials are ground through the collision effect of the materials, brittleness is increased through cryogenic grinding of the materials, the complex combined motion is realized, the grinding effect is better, the efficiency is better, meanwhile, the materials which have low melting points and are easy to melt during physical grinding can also be effectively ground, the whole operation flow is very simple, and the automation degree is high, the structure is relatively simple, and the device is worth popularizing.

Description

Liquid nitrogen cryogenic crushing device

Technical Field

The invention relates to the technical field related to liquid oxygen or liquid nitrogen, in particular to a liquid nitrogen cryogenic crushing device.

Background

Liquid nitrogen and liquid nitrogen are inert, colorless, odorless, non-corrosive, non-flammable, extremely low in temperature, do not support combustion, absorb a large amount of heat during vaporization, and are good refrigerants;

in various production activities, materials are often required to be crushed, the material crushing modes are multiple, physical crushing is a common mode, but a large amount of heat is generated due to collision friction and the like during physical crushing, so that the materials with a low melting point under normal pressure cannot be crushed, and meanwhile, the conventional physical crushing has relatively low efficiency, poor crushing effect, relatively low automation degree of crushing equipment and relatively complex structure.

Disclosure of Invention

The invention aims to provide a liquid nitrogen cryogenic crushing device which is used for overcoming the defects in the prior art.

The liquid nitrogen cryogenic grinding device comprises a grinding box, wherein a material cavity is formed in the upper surface of the grinding box, a liquid nitrogen cavity located inside the grinding box is formed in the right side of the material cavity, a first heat preservation layer is arranged on the outer side of the liquid nitrogen cavity, a first discharge pipe is arranged in the bottom wall of the liquid nitrogen cavity, a second discharge pipe is arranged in the bottom wall of the material cavity, a clamping cavity penetrates through the middle of the first discharge pipe and the second discharge pipe, a clamping rod used for blocking the first discharge pipe and the second discharge pipe is arranged in the clamping cavity, a first opening and a second opening used for communicating the first discharge pipe and the second discharge pipe are respectively arranged on the clamping rod, a first spring is fixedly connected between the right end of the clamping rod and the right wall of the clamping cavity, a control mechanism used for controlling the clamping rod to move is arranged on the lower side of the first spring, a gasification cavity is arranged at the lower end of the first discharge pipe, the outside in gasification chamber is equipped with the second heat preservation, the metal rod that is used for providing the heat sets firmly on the right wall in gasification chamber, the right downside of metal rod is equipped with and is used for control whether the circular telegram of metal rod constructs, the left end intercommunication in gasification chamber has the inlet pipe, be equipped with the one-way revolving door of opening of bilateral position symmetry in the inlet pipe, the right side butt of revolving door have set firmly in be used for on the inlet pipe diapire and hold the adsorption block of revolving door, the downside of the left end of inlet pipe is connected with the swivel tube, the swivel tube is located the ball intracavity, the upper end of swivel tube rotate through first bearing connect in the roof in ball chamber, the downside intercommunication in ball chamber has crushing chamber, crushing intracavity is equipped with and is used for kibbling rubbing crusher to construct, crushing chamber's downside intercommunication has the export chamber of bilateral position symmetry.

On the basis of the technical scheme, the crushing mechanism comprises fixed plates which are fixedly arranged on the inner wall of the crushing cavity and are symmetrical up and down, a circular cavity with meshing teeth is arranged at the center of each fixed plate, a gear cavity is arranged between the fixed plates, a first rotating shaft is rotatably connected to the bottom wall of the crushing cavity, a first gear positioned in the gear cavity is fixedly connected to the first rotating shaft, the first gear is in meshing connection with a second gear positioned in the gear cavity and slidably connected to the upper wall and the lower wall of the gear cavity, and a gear rod shaft which is rotatably connected to the lower end of the rotary pipe and is in meshing connection with the meshing teeth on the circular side wall of the circular cavity is fixedly connected to the second gear;

the lower side of the gear rod shaft is fixedly connected with a rotating box through a second bearing, a rotating cavity is arranged in the rotating box, a shaft cavity communicated with the rotating cavity and the rotating pipe is arranged in the gear rod shaft, a planetary wheel cavity with meshing teeth on an annular side wall is arranged in the upper surface of the rotating box, a third gear meshed with the gear rod shaft is arranged in the planetary wheel cavity, the upper side of the third gear is connected with a second rotating shaft in a key mode, the upper end of the second rotating shaft is fixedly connected with a third bearing, the right side of the third bearing is fixedly connected with a connecting rod, and the right end of the connecting rod is fixedly connected with a fourth bearing fixedly arranged on the first rotating shaft;

the lower extreme of rack pole axle sets firmly the puddler of bilateral symmetry, be equipped with in the rotatory intracavity and be used for colliding kibbling metal ball, be equipped with the screening net that can see through the powder in the diapire of rotatory chamber.

On the basis of the technical scheme, the control mechanism comprises a motor cavity positioned at the lower right corner inside the crushing box, a sliding cavity is arranged in the top wall of the motor cavity, a sliding rod is connected in the sliding cavity in a sliding mode, a pressing block is fixedly arranged on the left side of the lower end of the sliding rod, and a pull rope is fixedly connected between the upper end of the sliding rod and the right end of the clamping rod;

the motor is fixedly arranged on the left wall of the motor cavity, a third rotating shaft is dynamically connected to the right side of the motor, the right end of the third rotating shaft is fixedly connected with a rotary table located on the rear side of the sliding rod, and an extrusion block capable of extruding the pressing block downwards is fixedly connected to the rotary table.

On the basis of the technical scheme, the electrifying mechanism comprises a contact cavity located in the rear wall of the motor cavity, a sliding block is connected in the contact cavity in a sliding mode, a first cavity is arranged in the rear side of the top wall of the contact cavity, the lower end of the first cavity is connected with a push rod of the sliding block in a sliding mode, a second spring is fixedly connected between the push rod and the top wall of the first cavity, a second cavity located in the top wall of the contact cavity is arranged on the front side of the first cavity, a conductive block is connected in the second cavity in a sliding mode, the conductive block is fixedly connected with a third spring between the top walls of the second cavity, a conductive sheet capable of being in contact with the conductive block is fixedly arranged in the upper surface of the sliding block, and the conductive sheet is connected with the metal rods through a wire circuit.

On the basis of the technical scheme, a bevel gear cavity is arranged on the left side of the motor cavity and located inside the crushing box, a first bevel gear which is connected to the lower end of the first rotating shaft in a key mode is arranged in the bevel gear cavity, the lower side of the first bevel gear is connected with a second bevel gear in a meshed mode, and the right side of the second bevel gear is connected with a fourth rotating shaft which penetrates through the right wall of the bevel gear cavity and is in power connection with the motor in a key mode.

The invention has the beneficial effects that: realized adding in batches and deep freezing the automation of material, smashed the material through the collision effect to the material again, increase the combined motion of fragility and complicacy through the cryrogenic of material, can make kibbling effect better, efficiency is better, simultaneously to some melting points low, also can carry out effectual smashing by the material that melts easily when physics is smashed, moreover whole operation flow very simple, degree of automation is high, the structure is also relatively simpler, is worth promoting.

Drawings

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

FIG. 1 is a schematic diagram of the overall structure of a liquid nitrogen cryogenic grinding device of the invention;

FIG. 2 is an enlarged view of the invention at A in FIG. 1;

FIG. 3 is a schematic view of the present invention taken along the line B-B of FIG. 1;

fig. 4 is an enlarged view of the invention at C in fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, 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.

Referring to fig. 1 to 4, the liquid nitrogen cryogenic grinding device according to the embodiment of the present invention includes a grinding box 10, a material cavity 11 is disposed in an upper surface of the grinding box 10, a liquid nitrogen cavity 13 located inside the grinding box 10 is disposed on a right side of the material cavity 11, a first thermal insulation layer 12 is disposed outside the liquid nitrogen cavity 13, a first discharge pipe 46 is disposed in a bottom wall of the liquid nitrogen cavity 13, a second discharge pipe 44 is disposed in a bottom wall of the material cavity 11, a clamp cavity 49 penetrates through a middle portion between the first discharge pipe 46 and the second discharge pipe 44, a clamp rod 47 for blocking the first discharge pipe 46 and the second discharge pipe 44 is disposed in the clamp cavity 49, a first opening 45 and a second opening 43 for communicating the first discharge pipe 46 and the second discharge pipe 44 are respectively disposed on the clamp rod 47, a first spring 48 is fixedly connected between a right end of the clamp rod 47 and a right wall of the clamp cavity 49, the downside of first spring 48 is equipped with and is used for controlling control mechanism 801 that kelly 47 removed, the lower extreme of first exhaust pipe 46 is equipped with gasification chamber 54, the outside in gasification chamber 54 is equipped with second heat preservation 53, metal rod 52 that is used for providing the heat has set firmly on the right wall in gasification chamber 54, the right downside of metal rod 52 is equipped with and is used for controlling whether circular telegram of metal rod 52 constructs 802, the left end intercommunication in gasification chamber 54 has inlet pipe 42, be equipped with the one-way revolving door 40 of opening of bilateral position symmetry in the inlet pipe 42, the right side butt of revolving door 40 has set firmly be used for holding on the inlet pipe 42 diapire adsorption block 41 of revolving door 40, the downside of the left end of inlet pipe 42 is connected with revolving tube 15, revolving tube 15 is located ball chamber 14, the upper end of revolving tube 15 rotate through first bearing 39 and connect in the roof of ball chamber 14, the lower side of the ball cavity 14 is communicated with a crushing cavity 27, a crushing mechanism 803 for crushing is arranged in the crushing cavity 27, and the lower side of the crushing cavity 27 is communicated with an outlet cavity 38 which is symmetrical in left and right positions.

In addition, in one embodiment, the crushing mechanism 803 includes a fixed plate 25 fixed on the inner wall of the crushing cavity 27 in a vertically symmetrical manner, a circular cavity 24 with engaging teeth on the annular side wall is provided at the center of the fixed plate 25, a gear cavity 23 is provided between the fixed plates 25, a first rotating shaft 26 is rotatably connected to the bottom wall of the crushing cavity 27, a first gear 16 located in the gear cavity 23 is fixedly connected to the first rotating shaft 26, a second gear 17 located in the gear cavity 23 and slidably connected to the upper and lower walls of the gear cavity 23 is engaged and connected to the first gear 16, and a rack bar shaft 18 rotatably connected to the lower end of the rotating pipe 15 and engaged and connected to the engaging teeth on the annular side wall of the circular cavity 24 is fixedly connected to the second gear 17;

a rotating box 19 is fixedly connected to the lower side of the gear shaft 18 through a second bearing 73, a rotating cavity 20 is arranged inside the rotating box 19, a shaft cavity 71 communicated with the rotating cavity 20 and the rotating pipe 15 is arranged in the gear shaft 18, a planetary wheel cavity 72 with meshing teeth on an annular side wall is arranged in the upper surface of the rotating box 19, a third gear 70 connected to the gear shaft 18 in a meshing manner is arranged in the planetary wheel cavity 72, a second rotating shaft 69 is connected to the upper side of the third gear 70 in a key manner, a third bearing 66 is fixedly connected to the upper end of the second rotating shaft 69, a connecting rod 67 is fixedly connected to the right side of the third bearing 66, and a fourth bearing 68 fixedly connected to the first rotating shaft 26 is fixedly connected to the right end of the connecting rod 67;

the lower end of the rack shaft 18 is fixedly provided with a stirring rod 21 with symmetrical left and right positions, a metal ball 22 for collision crushing is arranged in the rotating cavity 20, and a screening net 74 capable of penetrating powder is arranged in the bottom wall of the rotating cavity 20.

In addition, in one embodiment, the control mechanism 801 includes a motor cavity 31 located at the lower right corner inside the crushing box 10, a sliding cavity 51 is arranged in the top wall of the motor cavity 31, a sliding rod 65 is slidably connected in the sliding cavity 51, a pressing block 29 is fixedly arranged at the left side of the lower end of the sliding rod 65, and a pull rope 50 is fixedly connected between the upper end of the sliding rod 65 and the right end of the clamping rod 47;

a motor 33 is fixedly arranged on the left wall of the motor cavity 31, a third rotating shaft 32 is dynamically connected to the right side of the motor 33, a rotating disc 30 located on the rear side of the sliding rod 65 is fixedly connected to the right end of the third rotating shaft 32, and an extrusion block 28 capable of extruding the pressing block 29 downwards is fixedly connected to the rotating disc 30.

In addition, in one embodiment, the energizing mechanism 802 includes a contact cavity 63 located in the rear wall of the motor cavity 31, a sliding block 64 is connected in the contact cavity 63 in a sliding way, a first cavity 55 is arranged in the rear side of the top wall of the contact cavity 63, a push rod 57 with the lower end fixedly arranged on the slide block 64 is slidably connected in the first cavity 55, a second spring 56 is fixedly connected between the push rod 57 and the top wall of the first cavity 55, the front side of the first cavity 55 is provided with a second cavity 61 in the top wall of the contact chamber 63, a conductive block 62 is connected in the second cavity 61 in a sliding manner, a third spring 60 is fixedly connected between the conductive block 62 and the top wall of the second cavity 61, and a conductive sheet 58 capable of contacting with the conductive block 62 is fixedly arranged in the upper surface of the sliding block 64, and the conductive sheet 58 is electrically connected with the metal rod 52 through an electric wire 59.

In addition, in one embodiment, a bevel gear cavity 35 is disposed at the left side of the motor cavity 31 and inside the pulverizing box 10, a first bevel gear 37 connected to the lower end of the first rotating shaft 26 in a key manner is disposed in the bevel gear cavity 35, a second bevel gear 36 is connected to the lower side of the first bevel gear 37 in a meshing manner, and a fourth rotating shaft 34 penetrating through the right wall of the bevel gear cavity 35 and connected to the motor 33 in a power manner is connected to the right side of the second bevel gear 36 in a key manner.

In the initial state, the latch 47 is positioned at the leftmost side by the elastic force of the first spring 48 to block the first discharge pipe 46 and the second discharge pipe 44, the slide rod 65 is positioned at the uppermost side, the rotary door 40 is sucked by the suction block 41, the pressing block 28 is positioned at the uppermost side, the slider 64 and the push rod 57 are positioned at the lowermost side by the elastic force of the second spring 56, and the conductive block 62 is positioned at the lowermost side by the elastic force of the third spring 60.

When the crushing work is needed, enough materials to be crushed are added into the material cavity 11, the motor 33 is started, the third rotating shaft 32 rotates and drives the rotating disc 30 to rotate, the extrusion block 28 rotates forwards and extrudes the pressing block 29 downwards, the pressing block 29 moves downwards and drives the sliding rod 65 to move downwards, the pulling rope 50 is tensioned, the clamping rod 47 moves rightwards under the pulling force of the pulling rope 50, the first discharge pipe 46 and the second discharge pipe 44 are respectively communicated with the first opening 45 and the second opening 43, and then liquid nitrogen flows into the gasification cavity 54 along the first discharge pipe 46, and the materials flow into the feeding pipe 42 along the second discharge pipe 44;

as the rotary disc 30 continues to rotate, the pressing block 28 will be disengaged from the pressing block 29, and the slide rod 65 is pulled upward by the pull rope 50 under the elastic force of the first spring 48, and the blocking rod 47 moves to the left and blocks the first discharge pipe 46 and the second discharge pipe 44 again;

then the rotating disc 30 continues to rotate and upwards extrudes the sliding block 64, then the sliding block 64 moves upwards and abuts against the conductive block 62, then a circuit where the electric wire 59 is located is connected, then the metal rod 52 is electrified and radiates heat, further the liquid nitrogen in the gasification cavity 54 is rapidly gasified, further the air pressure in the gasification cavity 54 is rapidly increased, further the adsorption block 41 cannot continue adsorbing the rotating door 40, further the rotating door 40 is opened, the materials are flushed into the rotating cavity 20 along the rotating pipe 15 and the shaft cavity 71 by the high-pressure low-temperature nitrogen, and meanwhile, the materials are deeply frozen by the low-temperature nitrogen;

then the rotary table 30 continues to rotate, the extrusion block 28 is disconnected from the sliding block 64, the sliding block 64 and the push rod 57 move to the lowest side under the elastic force of the second spring 56, the conductive block 62 moves to the lowest side under the elastic force of the third spring 60, the conductive block 62 is disconnected from the conductive sheet 58, the metal rod 52 stops heating, and then the rotary table 30 continues to rotate to the highest end to finish the addition and deep freezing of a round of materials;

meanwhile, the motor 33 rotates to drive the fourth rotating shaft 34 to rotate, and further drive the first rotating shaft 26 to rotate through the second bevel gear 36 and the first bevel gear 37, and further drive the first gear 16 to rotate and drive the second gear 17 to rotate, and further under the meshing action of the second gear 17 and the meshing teeth of the side wall of the circular cavity 24, the second gear 17 will rotate around the first rotating shaft 26, and further drive the rotating box 19 to rotate around the first rotating shaft 26 through the gear shaft 18, and simultaneously the gear shaft 18 rotates and drives the third gear 70 to rotate, because the axial distance between the second rotating shaft 69 and the first rotating shaft 26 is fixed through the third bearing 66, the connecting rod 67 and the fourth bearing 68, and further the second bearing 69 will be always located between the first rotating shaft 26 and the gear shaft 18, and further under the meshing connection of the rotating action of the third gear 70 and the annular side wall of the planetary gear cavity 72, the third gear 70 will drive the rotary box 19 to rotate around the gear shaft 18, and the gear shaft 18 will drive the stirring rod 21 to rotate in the opposite direction to the rotary box 19;

and then the combined movement is as follows: revolution motion of the rotary case 19 around the first rotary shaft 26, rotation motion around the rack shaft 18 as a rotation center, and rotation motion of the paddle 21 in a direction opposite to the rotation direction of the rotation motion;

and then the materials and the metal balls 22 in the rotating cavity 20 are stirred and shaken through the combined motion, and the crushing effect on the materials is realized through the collision of the materials and the materials, the materials and the metal balls and the collision of the materials and the cavity wall of the rotating cavity 20

After the crushing is completed, the material with the qualified particle size will fall through the sieving screen 74 into the outlet chamber 38 and be discharged.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a liquid nitrogen cryrogenic reducing mechanism, includes crushing case, its characterized in that: the upper surface of the crushing box is internally provided with a material cavity, the right side of the material cavity is provided with a liquid nitrogen cavity positioned in the crushing box, the outer side of the liquid nitrogen cavity is provided with a first heat preservation layer, the bottom wall of the liquid nitrogen cavity is internally provided with a first discharge pipe, the bottom wall of the material cavity is internally provided with a second discharge pipe, a clamping cavity penetrates through the middle of the first discharge pipe and the second discharge pipe, a clamping rod for blocking the first discharge pipe and the second discharge pipe is arranged in the clamping cavity, the clamping rod is respectively provided with a first opening and a second opening for communicating the first discharge pipe and the second discharge pipe, a first spring is fixedly connected between the right end of the clamping rod and the right wall of the clamping cavity, the lower side of the first spring is provided with a control mechanism for controlling the movement of the clamping rod, the lower end of the first discharge pipe is provided with a gasification cavity, and the outer side of the gasification cavity is provided with a second heat preservation layer, a metal bar for providing heat is fixedly arranged on the right wall of the gasification cavity, a power-on mechanism for controlling whether the metal bar is powered on is arranged on the right lower side of the metal bar, the left end of the gasification cavity is communicated with a feeding pipe, a unidirectional opening revolving door which is symmetrical in left-right position is arranged in the feeding pipe, an adsorption block which is fixedly arranged on the bottom wall of the feeding pipe and used for sucking the revolving door is abutted to the right side of the revolving door, a revolving pipe is connected to the lower side of the left end of the feeding pipe and located in a ball cavity, the upper end of the revolving pipe is rotatably connected to the top wall of the ball cavity through a first bearing, a crushing cavity is communicated with the lower side of the ball cavity, a crushing mechanism for crushing is arranged in the crushing cavity, and an outlet cavity which is symmetrical in left-right position is communicated with the lower side of the crushing cavity; the crushing mechanism comprises fixed plates which are fixedly arranged on the inner wall of the crushing cavity and are symmetrical up and down, a circular cavity with meshing teeth is arranged on the annular side wall at the center of each fixed plate, a gear cavity is arranged between the fixed plates, a first rotating shaft is rotatably connected to the bottom wall of each crushing cavity, a first gear positioned in the gear cavity is fixedly connected to the first rotating shaft, the first gear is in meshing connection with a second gear positioned in the gear cavity and slidably connected to the upper wall and the lower wall of the gear cavity, and a rack rod shaft which is rotatably connected to the lower end of the rotary pipe and is in meshing connection with the meshing teeth on the annular side wall of the circular cavity is fixedly connected to the second gear; the lower side of the gear rod shaft is fixedly connected with a rotating box through a second bearing, a rotating cavity is arranged in the rotating box, a shaft cavity communicated with the rotating cavity and the rotating pipe is arranged in the gear rod shaft, a planetary wheel cavity with meshed teeth is arranged on an annular side wall in the upper surface of the rotating box, a third gear meshed with the gear rod shaft is arranged in the planetary wheel cavity, the upper side of the third gear is in key connection with a second rotating shaft, the upper end of the second rotating shaft is fixedly connected with a third bearing, the right side of the third bearing is fixedly connected with a connecting rod, and the right end of the connecting rod is fixedly connected with a fourth bearing fixedly arranged on the first rotating shaft; stirring rods with symmetrical left and right positions are fixedly arranged at the lower end of the gear rod shaft, metal balls for collision crushing are arranged in the rotating cavity, and a screening net capable of allowing powder to permeate is arranged in the bottom wall of the rotating cavity; the control mechanism comprises a motor cavity positioned at the lower right corner inside the crushing box, a sliding cavity is arranged in the top wall of the motor cavity, a sliding rod is connected in the sliding cavity in a sliding manner, a pressing block is fixedly arranged on the left side of the lower end of the sliding rod, and a pull rope is fixedly connected between the upper end of the sliding rod and the right end of the clamping rod; a motor is fixedly arranged on the left wall of the motor cavity, the right side of the motor is in power connection with a third rotating shaft, the right end of the third rotating shaft is fixedly connected with a rotary table positioned at the rear side of the sliding rod, and an extrusion block capable of extruding a pressing block downwards is fixedly connected onto the rotary table; the power-on mechanism comprises a contact cavity positioned in the rear wall of the motor cavity, a sliding block is connected in the contact cavity in a sliding manner, a first cavity is arranged in the rear side of the top wall of the contact cavity, a push rod of which the lower end is fixedly arranged on the sliding block is connected in the first cavity in a sliding manner, a second spring is fixedly connected between the push rod and the top wall of the first cavity, a second cavity positioned in the top wall of the contact cavity is arranged in the front side of the first cavity, a conductive block is connected in the second cavity in a sliding manner, a third spring is fixedly connected between the conductive block and the top wall of the second cavity, a conductive sheet capable of being in contact with the conductive block is fixedly arranged in the upper surface of the sliding block, and the conductive sheet is connected with the metal rod through a wire circuit; the left side in motor chamber is equipped with and is located smash the inside bevel gear chamber in case, the bevel gear intracavity be equipped with key connection in first bevel gear of first pivot lower extreme, the downside meshing of first bevel gear is connected with the second bevel gear, the right side key-type connection of second bevel gear have run through the right wall in bevel gear chamber and with the fourth pivot that motor power is connected.