CN114485103B

CN114485103B - Intelligent drier with controllable drying degree

Info

Publication number: CN114485103B
Application number: CN202210301808.8A
Authority: CN
Inventors: 周旭泉
Original assignee: DONGMING JUJIN CHEMICAL CO LTD
Current assignee: DONGMING JUJIN CHEMICAL CO LTD
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2023-05-05
Anticipated expiration: 2042-03-24
Also published as: CN114485103A

Abstract

The invention discloses an intelligent dryer with controllable drying degree, which comprises a box body, wherein a drying mechanism is arranged in the box body; the utility model discloses a flood dragon blade, including the flood dragon blade pole, the flood dragon blade pole inner wall is connected in the box including running through the rotation, the cavity has been seted up to flood dragon blade pole inner wall, cavity inner wall rotates and is connected with first pole, first pole one end lateral wall is fixed with the impeller, first pole lateral wall equipartition is fixed with a plurality of cams, flood dragon blade pole lateral wall has seted up a plurality of recesses along axial equipartition and along circumference, the recess inner wall has the box body through a plurality of spring a elastic connection, box body diapire symmetry is fixed with the second pole, the second pole is fixed with the piezoelectricity piece. According to the invention, on one hand, the heating gas heats the dragon blade rod, on the other hand, the heating gas heats the inner wall of the box body through the circulating pipe, and finally, the heating gas is sprayed out from the jet head, and the flowing hot gas is utilized to blow and dry the material, so that the drying efficiency of the material is further improved.

Description

Intelligent drier with controllable drying degree

Technical Field

The invention relates to the technical field of dryers, in particular to an intelligent dryer with controllable drying degree.

Background

The dryer refers to mechanical equipment for reducing the moisture of materials by using heat energy, and is used for drying objects.

When the current desiccator is used for drying materials, the single drying mode is usually adopted, the interference to the materials is avoided in the drying process, the drying effect is poor, when the materials with different drying degrees are required to be obtained, the desiccator needs to be frequently opened and closed, so that a great deal of heat in the desiccator is lost, energy waste is caused, the drying efficiency is low, and meanwhile, the current desiccator is low in heat utilization rate and high in use cost.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an intelligent dryer with controllable drying degree.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the intelligent dryer with the controllable drying degree comprises a box body, wherein a drying mechanism is arranged in the box body;

the utility model provides a drying mechanism, including running through the flood dragon blade pole of rotating connection in the box, the cavity has been seted up to flood dragon blade pole inner wall, cavity inner wall rotates and is connected with first pole, first pole one end lateral wall is fixed with the impeller, first pole lateral wall equipartition is fixed with a plurality of cams, flood dragon blade pole lateral wall is along axial equipartition and along circumference seting up a plurality of recesses, the recess inner wall has the box body through a plurality of spring a elastic connection, box body diapire symmetry is fixed with the second pole, the second pole runs through the recess inner wall, the one end of second pole is fixed with the piezoelectric disc, there is the clamp plate through a plurality of spring b elastic connection in the box body, a plurality of dust absorption holes have been seted up on the clamp plate, be fixed with the brush hair on the clamp plate, the convex slot has been seted up to the blade lateral wall of flood dragon blade pole, through conductive spring elastic connection T shape pole in the convex slot, T shape pole one end is fixed with humidity transducer, the box diapire runs through and is fixed with a plurality of collection boxes, be equipped with electronic control valve in the collection box, electronic control valve and humidity transducer electric connection, piezoelectric disc electric connection.

Further, drying mechanism still includes the rectangle piece of fixed connection on the box, spherical chamber has been seted up to rectangle piece inner wall symmetry, spherical intracavity wall symmetry has run through and has been seted up the sliding chamber, symmetrical sealed sliding connection has the heat conduction piece in the sliding chamber, the embedded heater strip that is equipped with of heat conduction piece, arc wall has been seted up to spherical intracavity wall symmetry, two spherical intracavity wall runs through jointly and rotates and be connected with the third pole, spherical intracavity wall runs through respectively and rotates and be connected with the fourth pole, the equal fixedly connected with hang lever of one end of fourth pole and third pole, two that are close to each other hang lever lateral wall is connected with the swinging pillar jointly, swinging pillar inner wall through connection has the balancing pole, balancing pole sliding connection is in the arc wall, the equal swivelling joint in both ends of balancing pole has the pull rod, the pull rod is connected with a corresponding heat conduction piece lateral wall.

Further, the inner wall of the sliding cavity is fixedly connected with a one-way air inlet pipe and a one-way air outlet pipe in a penetrating mode, one end, far away from the sliding cavity, of the one-way air outlet pipe is fixedly communicated with the inner wall of the cavity, and one end, far away from the sliding cavity, of the one-way air inlet pipe is fixedly communicated with the inner wall of the box body.

Further, the inner wall of the box body is provided with a circulating pipe, the circulating pipe is fixedly communicated with the inner wall of the cavity, one end of the box body, which is far away from the unidirectional air inlet pipe, is fixedly connected with a jet head, and one end of the circulating pipe, which is far away from the cavity, is fixedly communicated with the jet head.

Further, the one-way exhaust hole is formed in the inner wall of the groove, the top wall of the box body penetrates through and is fixedly connected with a Z-shaped pipe, and the side wall of the Z-shaped pipe penetrates through and is slidably connected with a pushing block.

Further, a cylindrical cam is fixed at one end of the fourth rod close to the Z-shaped pipe, an L-shaped rod is connected in a sliding mode in the groove hole in the side wall of the cylindrical cam, and the L-shaped rod is fixedly connected with the pushing block.

Further, a driving wheel is fixed on one end side wall of the dragon blade rod, a driven wheel is fixed on the fourth rod side wall, and the driving wheel is connected with the driven wheel through a synchronous belt.

Further, the side wall of the box body is fixed with a motor through a folding rod, the output end of the motor and the dragon blade rod are coaxially fixed, and the two adjacent side walls of the box body are jointly fixed with an elastic membrane.

The invention has the following advantages:

1. through structures such as an inclined rod, a swinging column, a sliding cavity, a fourth rod, a pull rod and the like, continuously extracting heat-loss gas from the box body for heating and pressurizing to improve the heating speed, and meanwhile, the fourth rod can drive the cylindrical cam to rotate, so that the discharging and drying can be automatically carried out in the Z-shaped pipe without manual interference;

2. the heating gas heats the dragon blade rod on one hand, so that the dragon blade rod has a contact type effect of drying materials, on the other hand, the heating gas heats the inner wall of the box body through the circulating pipe, the materials are dried from the other direction, finally the heating gas is sprayed out from the jet head, the flowing hot gas is utilized to blow and dry the materials, the drying efficiency of the materials is further improved, and finally the gas losing a large amount of heat flows back into the sliding cavity through the unidirectional air inlet pipe to be heated again, so that the heat utilization rate is improved, and the energy is saved;

3. the second rod drives the box body to move towards the outer part of the dragon blade rod, the box body and the pressing plate jointly impact the materials, the materials are extruded, dispersed or dithered and thrown out, so that the drying speed of the materials is improved, the bristles can rub and brush the surfaces of the materials, impurities fall off the surfaces of the materials, and the fallen impurities are sucked into the box body through negative pressure in the box body for filtering and collecting;

4. humidity transducer inserts in the material and measures the humidity in the material, measures more accurately, and then judges the desiccation degree of material, from left to right sets for cascaded desiccation degree control interval to different humidity transducer in the box, controls the switching of the electronic control valve in the different collection boxes, obtains the material of different desiccation degree intervals.

Drawings

FIG. 1 is a schematic diagram of a drying degree controllable intelligent dryer according to the present invention;

FIG. 2 is an enlarged schematic view of the portion A of FIG. 1;

FIG. 3 is an enlarged schematic view of the portion B of FIG. 1;

fig. 4 is a perspective view of the dragon blade bar in the intelligent dryer with controllable drying degree.

In the figure: the device comprises a box body 1, a motor 2, a 3-screw blade rod, a 4Z-shaped tube, a 5 rectangular block, a 6 spherical cavity, a 7 sliding cavity, a 8 fourth rod, a 9 inclined rod, a 10 arc-shaped groove, a 11 swing column, a 12 balance rod, a 13 third rod, a 14 heat conducting block, a 15 heating wire, a 16 piezoelectric sheet, a 17 cylindrical cam, a 18L-shaped rod, a 19 push block, a 21 cavity, a 22 first rod, a 23 impeller, a 24 cam, a 25 groove, a 26 box body, a 27 pressing plate, 28 bristles, a 29 second rod, a 30 convex groove, a 31 conductive spring, a 32T-shaped rod, a 33 humidity sensor, a 34 circulation tube, a 35 air injection head, a 36 unidirectional air outlet pipe, a 37 collecting box, a 38 unidirectional air inlet pipe and a 39 pull rod.

Detailed Description

Referring to fig. 1-4, an intelligent dryer with controllable drying degree comprises a box body 1, wherein a drying mechanism is arranged in the box body 1;

the drying mechanism comprises a dragon blade rod 3 which is connected in the box body 1 in a penetrating and rotating way, a cavity 21 is formed in the inner wall of the dragon blade rod 3, a first rod 22 is connected in the inner wall of the cavity 21 in a rotating way, an impeller 23 is fixed on the side wall of one end of the first rod 22, a plurality of cams 24 are uniformly distributed on the side wall of the first rod 22, a plurality of grooves 25 are uniformly distributed on the side wall of the dragon blade rod 3 along the axial direction and are formed in the circumferential direction, the inner wall of the groove 25 is elastically connected with a box body 26 through a plurality of springs a, a second rod 29 is symmetrically fixed on the bottom wall of the box body 26, the second rod 29 penetrates through the inner wall of the groove 25, one end of the second rod 29 is fixedly provided with a piezoelectric plate 16, a pressing plate 27 is elastically connected in the box body 26 through a plurality of springs b, the clamp plate 27 is last to have offered a plurality of dust absorption holes, be fixed with brush hair 28 on the clamp plate 27, protruding groove 30 has been offered to the blade lateral wall of flood dragon blade pole 3, be connected with T shape pole 32 through conductive spring 31 elastic connection in the protruding groove 30, T shape pole 32 one end is fixed with humidity transducer 33, box 1 diapire runs through and is fixed with a plurality of collection boxes 37, be equipped with the electronic control valve in the collection box 37, electronic control valve and humidity transducer 33 electric connection, conductive spring 31 and piezoelectric plate 16 electric connection, two second poles 29 that every recess 25 inner wall runs through all can with a pivoted cam 24 counterbalance contact.

The drying mechanism further comprises a rectangular block 5 fixedly connected to the box body 1, the inner wall of the rectangular block 5 is symmetrically provided with a spherical cavity 6, the inner wall of the spherical cavity 6 is symmetrically penetrated and provided with a sliding cavity 7, the inner wall of the sliding cavity 7 is symmetrically and slidably connected with a heat conducting block 14, the inner wall of the heat conducting block 14 is embedded with a heating wire 15, the inner wall of the spherical cavity 6 is symmetrically provided with an arc-shaped groove 10, the inner walls of the two spherical cavities 6 are jointly penetrated and rotatably connected with a third rod 13, the inner walls of the spherical cavity 6 are respectively penetrated and rotatably connected with a fourth rod 8, one ends of the fourth rod 8 and one end of the third rod 13 are fixedly connected with an inclined rod 9, the side walls of the two inclined rods 9 which are mutually close are jointly connected with a swinging column 11, the inner walls of the swinging column 11 are penetrated and connected with a balancing rod 12, two ends of the balancing rod 12 are slidably connected in the two arc-shaped grooves 10, two end side walls of the balancing rod 12 are embedded with balls capable of automatically moving, the pulling rod 39 and one corresponding ball is fixedly connected, and meanwhile the pulling rod 39 and one corresponding heat conducting block 14 are also connected through movable ball.

The inner wall of the sliding cavity 7 is fixedly connected with a one-way air inlet pipe 38 and a one-way air outlet pipe 36 in a penetrating manner, one end of the one-way air outlet pipe 36, which is far away from the sliding cavity 7, is fixedly communicated with the inner wall of the cavity 21, one end of the one-way air inlet pipe 38, which is far away from the sliding cavity 7, is fixedly communicated with the inner wall of the box body 1, heating gas enters the cavity 21 from the sliding cavity 7 through the one-way air outlet pipe 36, and the one-way air inlet pipe 38 is arranged on the inner wall of one end of the box body 1, which is far away from the Z-shaped pipe 4.

The inner wall of the box body 1 is provided with a circulating pipe 34, the circulating pipe 34 is fixedly communicated with the inner wall of one end of the cavity 21, which is far away from the Z-shaped pipe 4, the air jet head 35 is fixedly connected with one end of the box body 1, which is far away from the unidirectional air inlet pipe 38, one end of the circulating pipe 34, which is far away from the cavity 21, is fixedly communicated with the air jet head 35, and heating gas enters into the circulating pipe 34 for internal circulation, so that the inner wall of the box body 1 is heated.

The inner wall of the groove 25 is provided with a one-way exhaust hole, the top wall of the box body 1 penetrates through the side wall of the Z-shaped pipe 4,Z fixedly connected with the side wall of the pipe 4, the push block 19 penetrates through the side wall of the Z-shaped pipe 4 and is in sliding connection, the material is fed from the Z-shaped pipe 4, and the push block 19 can automatically convey and discharge the material.

One end of the fourth rod 8 close to the Z-shaped pipe 4 is fixedly provided with a cylindrical cam 17, an L-shaped rod 18 is slidably connected in a groove hole in the side wall of the cylindrical cam 17, the L-shaped rod 18 is fixedly connected with a push block 19, and after the cylindrical cam 17 rotates, the push block 19 is driven to reciprocate through the L-shaped rod 18.

The one end lateral wall of flood dragon blade pole 3 is fixed with the action wheel, and the fourth pole 8 lateral wall that keeps away from ejector pad 19 is fixed with from the driving wheel, and the action wheel passes through the hold-in range with following the driving wheel and connects, and flood dragon blade pole 3 passes through the action wheel, follows the driving wheel and hold-in range drives a fourth pole 8 rotation.

The motor 2 is fixed on the side wall of the box body 1 through a folding rod, the output end of the motor 2 and the dragon blade rod 3 are coaxially fixed, the elastic films are jointly fixed on the side walls of two adjacent box bodies 26, the elastic films are used for preventing materials from entering the groove 25, and gaps between the box bodies 26 and the dragon blade rod 3 are insufficient for allowing the materials to enter the groove 25.

According to the invention, the motor 2 is turned on, the output end of the motor 2 drives the dragon blade rod 3 to rotate, under the action of the driving wheel, the driven wheel and the synchronous belt, the dragon blade rod 3 drives one of the fourth rods 8 to rotate, the fourth rods 8 drive the corresponding inclined rods 9 to rotate, the inclined rods 9 drive the swinging columns 11 to swing in a double-gyro mode by taking the gravity center of the swinging columns as the circle center, the two ends of the swinging columns 11 drive the corresponding balance rods 12 to generate displacement difference, the pull rods 39 and the heat conducting blocks 14 are driven to hermetically slide in the sliding cavity 7 through the displacement of the balance rods 12, the two heat conducting blocks 14 in the same sliding cavity 7 only can move oppositely and move backwards, the heating wire 15 is electrically connected with an external power supply, so that the gas cooled in the box body 1 is pumped into the sliding cavity 7 to be heated, the heated gas is extruded into the cavity 21 through the unidirectional air outlet pipe 36, the gas is compressed together when the heat conducting blocks 14 extrude the gas, the gas molecule spacing is reduced, the intermolecular force is increased, the movement frequency is increased, the friction is increased, the temperature is increased, the heating speed of the gas can be accelerated, and the two continuous sliding processes can be carried out under the condition that the two sliding cavities 7 are matched.

Simultaneously, under the cooperation of two swinging columns 11, a third rod 13, another fourth rod 8 and a plurality of inclined rods 9, the cylindrical cam 17 also rotates synchronously, and the cylindrical cam 17 rotates to drive the L-shaped rod 18 to reciprocate in the horizontal direction, so that the pushing block 19 intermittently pushes and feeds materials in the Z-shaped pipe 4, and the materials enter the box body 1 to be pushed and dried by the dragon blade rod 3.

When the heating gas in the sliding cavity 7 is flushed into the cavity 21 in a high-pressure state, the heating gas pushes the impeller 23 to rotate rapidly, the impeller 23 drives the first rod 22 to rotate, and the heating gas heats the dragon blade rod 3 at the same time, so that the whole temperature of the dragon blade rod 3 rises, and the contact type material drying effect is achieved.

Meanwhile, after the first rod 22 rotates, the cams 24 are driven to synchronously rotate, and then the cams 24 are continuously collided with two second rods 29 penetrating through the grooves 25, so that the second rods 29 drive the box 26 to move towards the outer part of the dragon blade rod 3, the box 26 and the pressing plate 27 jointly collide materials, and the materials are extruded, dispersed or dithered to be thrown out, so that the drying speed of the materials is improved.

When clamp plate 27 and material contact extrusion, because of the material surface impurity after the partial drying easily breaks away from, then brush hair 28 can carry out the friction brush to the material surface and move, make impurity drop from the material surface, the reaction force of material will promote clamp plate 27 to the inside sealed slip of box body 26, and then with the gaseous discharge in the box body 26, the box body 26 is inside to be in the negative pressure state, after clamp plate 27 loses the reaction force, the box body 26 is inside to inhale the box body 26 through the negative pressure with the impurity after falling down, be equipped with the filter bag in the box body 26 and filter the collection to impurity, later by the unified clear of user.

Because the piezoelectric sheet 16 is fixed at one end of the second rod 29, and then the piezoelectric sheet 16 collides with the side wall of the cam 24 to generate mechanical extrusion, the piezoelectric sheet 16 generates piezoelectric power to the conductive spring 31, the conductive spring 31 is electrified to shrink, and then the T-shaped rod 32 is driven to slide towards the outside of the dragon blade rod 3, so that one end of the T-shaped rod 32 is contacted with materials to disperse the materials, the humidity in the materials is measured by inserting the humidity sensor 33 into the materials, the measurement is more accurate, the dryness of the materials is further judged, and because each collecting box 37 is fixed between two adjacent dragon blade rods 3 blades, the T-shaped rod 32 and the humidity sensor 33 which extend out of the dragon blade rod 3 blade are used for measuring the humidity of the materials in the area, and then the electronic control valves in different collecting boxes 37 are controlled to open and close in a stepped dryness control interval set for different humidity sensors 33 from left to right in the box 1, so as to obtain the materials in different dryness intervals.

The gas entering the cavity 21 from the sliding cavity 7 under high heating pressure drives the first rod 22 to rotate through the impeller 23 on one hand, and the temperature of the dragon blade rod 3 is raised to dry the material in a contact manner, on the other hand, the heated gas flows into the circulating pipe 34 to heat the inner wall of the box body 1, so that the inner wall of the box body 1 dries the material from the other surface, finally the heated gas is sprayed out from the jet head 35, the flowing hot gas is utilized to blow and dry the material, the drying efficiency of the material is further improved, and finally the gas losing a large amount of heat flows back into the sliding cavity 7 through the unidirectional air inlet pipe 38 to be heated again, so that the waste heat of the heated gas is utilized for the last time, the heating speed of the gas in the sliding cavity 7 is quickened, the heat utilization rate is improved, and the energy is saved.

Claims

1. The intelligent dryer with the controllable drying degree comprises a box body (1) and is characterized in that a drying mechanism is arranged in the box body (1);

the utility model provides a drying mechanism, including running through flood dragon blade pole (3) of rotating connection in box (1), cavity (21) have been seted up to flood dragon blade pole (3) inner wall, cavity (21) inner wall rotation is connected with first pole (22), first pole (22) one end lateral wall is fixed with impeller (23), first pole (22) lateral wall equipartition is fixed with a plurality of cams (24), flood dragon blade pole (3) lateral wall is along the axial equipartition and along circumference seting up a plurality of recess (25), recess (25) inner wall has box (26) through a plurality of spring a elastic connection, box (26) diapire symmetry is fixed with second pole (29), second pole (29) run through recess (25) inner wall, the one end of second pole (29) is fixed with piezoelectric patches (16), be fixed with clamp plate (27) through a plurality of spring b elastic connection in box (26), set up a plurality of dust absorption holes on clamp plate (27), be fixed with brush hair (28) on clamp plate (27) lateral wall, protruding blade (3) diapire symmetry is fixed with a plurality of grooves (32) through a plurality of spring b elastic connection, protruding shape sensor (30), the bottom wall of the box body (1) is fixedly penetrated by a plurality of collecting boxes (37), an electronic control valve is arranged in each collecting box (37), the electronic control valve is electrically connected with the humidity sensor (33), and the conductive spring (31) is electrically connected with the piezoelectric sheet (16);

the drying mechanism further comprises a rectangular block (5) fixedly connected to the box body (1), spherical cavities (6) are symmetrically formed in the inner walls of the rectangular block (5), sliding cavities (7) are symmetrically formed in the inner walls of the spherical cavities (6) in a penetrating mode, heat conducting blocks (14) are symmetrically connected in a sealing and sliding mode, heating wires (15) are embedded in the heat conducting blocks (14), arc grooves (10) are symmetrically formed in the inner walls of the spherical cavities (6), a third rod (13) is jointly connected in a penetrating mode through the inner walls of the spherical cavities (6), a fourth rod (8) is respectively connected in a penetrating mode through the inner walls of the spherical cavities (6), inclined rods (9) are fixedly connected to one ends of the fourth rod (8) and one end of the third rod (13), swinging columns (11) are jointly connected to the side walls of the inclined rods (9), balancing rods (12) are connected in a penetrating mode to the inner walls of the swinging columns (11), the balancing rods (12) are connected in a sliding mode in the arc grooves (10), and two ends of the balancing rods (12) are connected with corresponding pull rods (39) in a penetrating mode, and two ends of the corresponding pull rods (39) are connected to the side walls of the corresponding pull rods (14).

The inner wall of the sliding cavity (7) is fixedly connected with a one-way air inlet pipe (38) and a one-way air outlet pipe (36) in a penetrating way, one end of the one-way air outlet pipe (36) far away from the sliding cavity (7) is fixedly communicated with the inner wall of the cavity (21), and one end of the one-way air inlet pipe (38) far away from the sliding cavity (7) is fixedly communicated with the inner wall of the box body (1);

a driving wheel is fixed on the side wall of one end of the dragon blade rod (3), a driven wheel is fixed on the side wall of the fourth rod (8), and the driving wheel is connected with the driven wheel through a synchronous belt;

the side wall of the box body (1) is fixed with a motor (2) through a folding rod, the output end of the motor (2) is coaxially fixed with a dragon blade rod (3), and the side walls of two adjacent box bodies (26) are jointly fixed with an elastic membrane;

one end of the second rod (29) is fixed with a piezoelectric sheet (16), and then the piezoelectric sheet (16) collides with the side wall of the cam (24) to generate mechanical extrusion, the piezoelectric sheet (16) generates piezoelectric effect to supply power to the conductive spring (31), the conductive spring (31) is electrified to shrink, and then the T-shaped rod (32) is driven to slide towards the outside of the dragon blade rod (3), one end of the T-shaped rod (32) is enabled to contact with materials, the materials are dispersed, and humidity in the materials is measured through the humidity sensor (33), and then the dryness of the materials is judged, each collecting box (37) is fixed between two adjacent dragon blade rods (3), the T-shaped rod (32) extending out of each dragon blade rod (3) and the humidity sensor (33) measure the humidity of the materials in the area, and then the humidity sensors (33) with different humidity from left to right inside the box (1) are set with stepped dryness control intervals to control the opening and closing of electronic control valves in different collecting boxes (37), and different dryness intervals of the materials are obtained.

2. The intelligent dryer with controllable drying degree according to claim 1, wherein a circulating pipe (34) is arranged on the inner wall of the box body (1), the circulating pipe (34) is fixedly communicated with the inner wall of the cavity (21), a jet head (35) is fixedly connected to one end, far away from the unidirectional air inlet pipe (38), of the box body (1), and one end, far away from the cavity (21), of the circulating pipe (34) is fixedly communicated with the jet head (35).

3. The intelligent dryer with controllable drying degree according to claim 2, wherein the inner wall of the groove (25) is provided with a unidirectional exhaust hole, the top wall of the box body (1) is fixedly connected with a Z-shaped tube (4) in a penetrating manner, and the side wall of the Z-shaped tube (4) is connected with a push block (19) in a penetrating and sliding manner.

4. A drying degree controllable intelligent dryer according to claim 3, wherein a cylindrical cam (17) is fixed at one end of a fourth rod (8) close to the Z-shaped pipe (4), an L-shaped rod (18) is slidably connected in a slot in the side wall of the cylindrical cam (17), and the L-shaped rod (18) is fixedly connected with a push block (19).