CN112937977B

CN112937977B - Vegetable film sealing device based on crank rocker mechanism

Info

Publication number: CN112937977B
Application number: CN202110091928.5A
Authority: CN
Inventors: 裴广华
Original assignee: Inner Mongolia Kuaiwei Technology Co ltd
Current assignee: Inner Mongolia Kuaiwei Technology Co ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2023-04-28
Anticipated expiration: 2040-05-26
Also published as: CN111605751B; CN111605751A; CN112937977A; CN112874851A; CN112874851B

Abstract

The invention discloses a vegetable film sealing device based on a crank and rocker mechanism, which comprises a shell, a film sealing mechanism and a film pulling mechanism, wherein the film sealing mechanism and the film pulling mechanism are sequentially arranged in the shell from left to right, the film pulling mechanism utilizes a worm gear mechanism to spread a preservative film, the film sealing mechanism utilizes the crank and rocker mechanism to enable the preservative film to be packaged on a vegetable preservative box, and the film sealing mechanism utilizes the crank and rocker mechanism to cut the preservative film from four different directions.

Description

Vegetable film sealing device based on crank rocker mechanism

Technical Field

The invention relates to the technical field of vegetable film sealing, in particular to a vegetable film sealing device based on a crank-rocker mechanism.

Background

With the development of scientific technology and the improvement of living standard, people pay more attention to the quality of vegetables, fruits and other commodities, and the packaging requirements of the vegetables, fruits and other commodities are also continuously improved, and especially the packaging of the preservative film capable of ventilating and preserving is particularly favored. However, the current packaging of the preservative film for vegetables and fruits mostly depends on manual operation, so that the average efficiency is low, and the time required for packaging is shortened as much as possible on the premise of ensuring the freshness of the vegetables and fruits as much as possible due to the large yield of the vegetables and fruits, so that the workers are very heavy in work, people feel tired easily, and the high efficiency is difficult to maintain for a long time, so that the research and development work of the automatic preservative film packaging equipment for the vegetables and fruits is necessary. In the whole vegetable and fruit preservative film packaging process, the finished vegetables and fruits are packaged as an important step. After the vegetables and fruits to be packaged are placed in the tray, the vegetables and fruits to be packaged are placed at the appointed position of the preservative film packaging device, the device can automatically apply films, then the tray which is used for containing the fruits and vegetables is pushed to complete packaging, finally the preservative film is cut through the film cutting part, and film sealing and packaging are completed, so that the preservative film packaging efficiency of agricultural products such as fruits and vegetables is greatly improved.

The existing film sealing device can only extrude and cut the preservative film from 3 directions, 3 mechanisms are controlled to move in different directions when the film sealing device works, the film sealing device drives the 3 mechanisms to work respectively, the driving device is complex due to the fact that a plurality of drives are arranged, the movement in the 3 directions is not irrelevant, in the cutting process, the movement process is controlled to ensure that the longitudinal cutting member and the transverse cutting member start to move at the same time, and meanwhile, the film sealing device stops after the proper position is reached, so that the driving is prevented from being complex, the device is improved to simplify the driving, and the control during the work is as simple as possible or is realized by using machinery.

In order to solve the problems of complex driving and high cost of the film sealing device, the device is designed to simplify driving by utilizing a crank rocker mechanism and a roller chute linkage mechanism, and the device is also provided with a sleeve to solve the problems in order to prevent the preservative film of the sheared part from being pulled apart when being pulled.

Disclosure of Invention

The invention aims to provide a vegetable film sealing device based on a crank and rocker mechanism, which aims to solve the problems in the prior art.

In order to achieve the above purpose, the present invention provides the following technical solutions: the vegetable film sealing device comprises a shell, a film sealing mechanism and a film pulling mechanism, wherein the film sealing mechanism and the film pulling mechanism are sequentially arranged in the shell from left to right, the film pulling mechanism utilizes a worm gear mechanism to enable a preservative film to be unfolded, the film sealing mechanism utilizes the crank rocker mechanism to enable the preservative film to be packaged on a vegetable preservative box, and the film sealing mechanism utilizes the crank rocker mechanism to cut the preservative film from four different directions. The film sealing mechanism realizes the cutting of the preservative film in four different directions through a motor and a crank rocker mechanism, and the film sealing device is simple to drive and convenient to maintain.

As a preferable technical scheme, a supporting and feeding cylinder is further arranged in the shell, the supporting and feeding cylinder is positioned below the film pulling mechanism, a vertical plate is arranged in the shell, the shell is divided into a power space and a film sealing space by the vertical plate, two groups of transverse plates are sequentially arranged in the power space from top to bottom, and a bearing plate is horizontally arranged in the film sealing space; the film sealing mechanism comprises a power component and a film sealing component, wherein the power component is arranged in a power space and is rotationally connected with the film sealing component, and the film sealing component is arranged above the bearing plate; the film pulling mechanism comprises a traction assembly, a rotating shaft and a blocker, wherein the rotating shaft is rotationally connected with the traction assembly, and the rotating shaft is rotationally connected with the blocker. The fresh-keeping box with vegetables is lifted by the supporting and conveying cylinder, the fresh-keeping box is in contact with the fresh-keeping film, the vertical plate separates the inner space of the shell, the transverse plate provides support for the installation of the extending shell, the bearing plate provides support for the installation of the film sealing component, the power component provides film sealing power for the film sealing component, the film sealing component cuts the fresh-keeping film from four different directions, the traction component spreads and tows the fresh-keeping film roll, the rotating shaft provides support for the installation of the fresh-keeping film roll, and the stopper limits the rotation of the rotating shaft.

As the preferred technical scheme, power pack includes power machine, rocker, extends the shell, the power machine sets up on the inside lower terminal surface of shell, is provided with the axis of rotation on the power machine, from last crank, the eccentric wheel of having set gradually down in the axis of rotation, the eccentric wheel is located between two sets of diaphragms, it is fixed with the riser to extend the shell to be located between two sets of diaphragms, the eccentric wheel rotates with the shell that extends to be connected, the crank rotates with the rocker to be connected, the other end and the membrane module of sealing of rocker rotate to be connected. The power machine provides power for the rotation of crank and eccentric wheel, and the axis of rotation transmits the power of power machine, and the crank drives the rocker and rotates, and the rocker changes circular motion into rectilinear motion and drives and seal the membrane subassembly and move, and the eccentric wheel extrudes the inside gasbag of extension shell, extends the shell and provides the space of installation for the gasbag.

As the preferred technical scheme, be provided with logical groove on the extension shell body, from left to right having set gradually pushing plate, gasbag in the extension shell, one side symmetry that the pushing plate is close to the eccentric wheel is provided with the connecting rod, the up and down terminal surface of eccentric wheel all is provided with the spout, two sets of the connecting rod is L type, and the L end of two sets of connecting rods is located the spout, and two sets of connecting rods pass through spout and eccentric wheel rotation to be connected, the pushing plate passes through connecting rod and spout realization and eccentric wheel rotation to be connected, the extension shell passes through pushing plate and spout realization and eccentric wheel rotation to be connected. The through groove provides a channel for the eccentric wheel to pass through the extension shell, the pushing plate extrudes the air bag when being forced to move towards the inside of the extension shell, the air bag is filled with air into the extension rod after being extruded, and the connecting rod is connected with the pushing plate and the eccentric wheel.

As the preferred technical scheme, seal membrane module includes two sets of vertical bars, two sets of backup pad, four sets of vertical plates at least, two sets of be provided with two sets of lead screws in the backup pad, two sets of symmetry is provided with two sets of transversal boards on the lead screw, two sets of the up end of transversal board all symmetry is provided with the spout, and a set of transversal board that is close to riser one side rotates with the rocker to be connected, four sets of vertical plates two by two sets of and set up respectively on riser and shell inner wall, two sets of be provided with the slide bar between the vertical plate, two sets of the both ends of vertical bar all are provided with the lantern ring, the lantern ring cover is established on the slide bar, two sets of all symmetry are provided with two sets of gyro wheels on the vertical bar, the gyro wheel divide into and be located the spout, the gyro wheel rotates with the spout to be connected, two sets of vertical bar passes through gyro wheel and spout realization and two sets of transversal board rotate to be connected. The vertical plate provides the support for the installation of slide bar, and vertical pole slidable mounting is on the slide bar, and the vertical pole carries out vertical extrusion to the plastic wrap, and the backup pad provides the support for the installation of lead screw, and the lead screw provides the support for the installation of transversal cut board, and two sets of transversal cut boards mutually support and transversely extrude and cut the plastic wrap, and the gyro wheel removes and drive the vertical pole and move on the slide bar in the spout.

As the preferable technical scheme, be close to riser one side be provided with the extension pole on the transversal cutting board, the extension pole is including extending connecting rod and cover and establish the extension sleeve shell on extending the connecting rod, the one end and the rocker rotation of extending the connecting rod are connected, and the other end of extending the connecting rod is provided with the extension board, the extension board is located the extension sleeve shell inside and with extension sleeve shell sliding connection, extension board and extension sleeve shell's internal surface zonulae occludens, extension sleeve shell is close to the one end of transversal cutting board and is provided with the air vent, extends sleeve shell and extends shell pipe connection. The extension rod extends the distance of movement of the transverse cutting plate on the screw rod and simultaneously provides power for the movement of the transverse cutting plate, the extension connecting rod and the extension sleeve are mutually matched to form a complete extension rod, the inner space of the extension sleeve forms an extension space under the separation of the extension plate, and the air bag in the extension shell is compressed and then transmits air into the extension space.

As the preferred technical scheme, the traction assembly comprises a traction shaft, a traction motor, a gear transmission group and at least four groups of shaft support plates, wherein the four groups of shaft support plates are arranged on a vertical plate and the inner wall of a shell respectively in a pair of groups, a rotating shaft is arranged on the shaft support plates in the pair of groups on the vertical plate, the traction shaft is arranged on the shaft support plates in the two groups on the inner wall of the shell, the traction motor is arranged on the inner wall of the shell and is connected with the traction shaft, a bevel gear is arranged on the traction motor, one end of the gear transmission group is rotationally connected with the bevel gear, and a worm is arranged at the other end of the gear transmission group and is rotationally connected with the rotating shaft. The traction shaft spreads and pulls the preservative film roll, the traction motor provides power for the rotation of the traction shaft, the gear transmission group transmits the power of the traction motor to the rotating shaft, the supporting plate provides support for the installation of the rotating shaft and the traction shaft, the bevel gear is rotationally connected with the gear transmission group, the power on the traction motor is transmitted to the gear transmission group, and the worm is rotationally connected with the rotating shaft to transmit the rotating power to the shaft.

As the preferred technical scheme, the pivot includes follower shaft, worm wheel, follow-up shaft is last to have set gradually axle supporting plate, limiting plate, sleeve, follower plate, reaction plate, axle supporting plate from a left side to the right side, the sleeve cover is established on the follower shaft, the follower plate is located the sleeve, the worm wheel cover is established on the sleeve and is rotated with the sleeve and be connected, and the both sides of worm wheel are provided with the resistance plate, and the worm wheel rotates with the worm to be connected, the limiting plate rotates with the brake to be connected. The shaft support plate provides an installation support for the follow-up shaft, the follow-up shaft drives the preservative film roll to rotate, the worm wheel is connected with the worm in a rotating way and transmits rotating power to the sleeve, the limiting plate limits the position of the sleeve on the follow-up shaft, meanwhile, the rotation of the follow-up shaft is limited under certain conditions, the sleeve moves leftwards on the follow-up shaft under the drive of the worm wheel and drives the follow-up shaft to rotate, the driven plate is welded on the follow-up shaft, when the sleeve moves to the leftmost end, the sleeve and the driven plate carry out gear transmission and drive the follow-up shaft to rotate, the reaction plate moves leftwards under the push of the sleeve, a plurality of groups of springs are arranged between the reaction plate and the shaft support plate, the springs are compressed when the reaction plate moves leftwards, the resistance plate limits the position of the worm wheel, meanwhile, a certain rotating resistance is increased for the rotation of the worm wheel, and the rotation of the follow-up shaft is limited by the limiting plate.

As the preferable technical scheme, the worm wheel comprises two groups of wheel shells, gear rings and rotating rings, two groups of ring grooves are formed in the opposite side end faces of the wheel shells, the gear rings and the rotating rings are respectively located in the two groups of ring grooves, the diameter of the rotating rings is smaller than that of the gear rings, the rotating rings are located in the gear rings, the gear rings and the rotating rings are rotationally connected with the wheel shells, the gear rings are rotationally connected with the worm, the rotating rings are rotationally connected with the sleeve, and a fixed ring is arranged between the gear rings and the rotating rings. The wheel shell provides support for installation of the gear ring and the rotating ring, the gear ring is rotationally connected with the worm, the fixed ring is integrated with the wheel shell, the rotating ring is rotationally connected with the sleeve, the gear ring transmits rotation power to the fixed shell, namely the wheel shell, and the wheel shell drives the rotating ring to rotate.

As the preferable technical scheme, the surface of gear ring is provided with the teeth of a cogwheel, and the internal surface of gear ring is provided with a plurality of groups ejector pad, fixed ring is fixed with two sets of wheel casings, is provided with a plurality of groups on the fixed ring and leads to the groove, and the surface of fixed ring is provided with a plurality of groups baffle, a plurality of groups the baffle is located one side that a plurality of groups led to the groove, be provided with a plurality of groups slider between gear ring and the fixed ring, baffle and slider one-to-one, be provided with the spring between dog and the slider, a plurality of groups the slider is provided with big wattle claw with the one side that the fixed ring contacted, be provided with a plurality of groups of little Jing Zhao on the terminal surface of one side that the rotating ring is close to the fixed ring, a plurality of groups da Jing claw and a plurality of groups of little wattle claw one-to-one, a plurality of groups da Jing claw pass through the groove and rotate with little wattle claw to be connected. The push block pushes the sliding block, so that the large wattle claw on the sliding block extends out of the through groove and is connected with the small wattle claw, the da Jing claw and the small wattle claw are matched with each other to transmit power to the rotating ring, and the spring provides reverse thrust for the sliding block, so that the sliding block returns to the original position, and the large wattle claw is retracted into the through groove.

Compared with the prior art, the invention has the beneficial effects that:

1. the film sealing mechanism realizes the cutting of the preservative film in four different directions through a motor and a crank rocker mechanism, and the film sealing device is simple to drive and convenient to maintain. In the process of lifting the preservative film by the lifting cylinder, the preservative film is contacted with the preservative film and pulled by the lifting cylinder, so that the preservative film is pulled out of the brand-new preservative film roll, when the preservative film is pulled out of the brand-new preservative film roll, the brand-new preservative film roll drives the follow-up shaft to rotate, thereby the follow-up shaft drives the limiting plate to rotate, the preservative film can be pulled out for a section in order to prevent the preservative film from being broken due to too tight pulling in the lifting process, and after the preservative film is pulled out for a certain distance, the telescopic rod is reinserted into the limiting hole of the limiting plate, so that the follow-up shaft stops rotating, and the poor sealing effect caused by too much pulling of the preservative film can be prevented.

2. The worm drives the rotation of gear ring, makes the chaste tree claw stretch out and be connected with the chaste tree claw for whole worm wheel rotates, and ordinary chaste tree mechanism is when outer lane atress drives the inner circle and rotates, and the inner circle is when receiving external force to need to reverse, and the inner circle can't reverse in the outer lane, and this worm wheel mechanism's setting makes the outer lane, namely the gear ring drives the inner circle and rotate the ring when rotating, through the setting of the chaste tree claw that can stretch out and draw back, makes the rotation ring can reverse in the gear ring, thereby reaches the effect that ordinary chaste tree mechanism can not reach.

3. After the packaged fresh-keeping box is taken away, the lifting cylinder returns to the original position again, the lifting cylinder pulls the fresh-keeping film when lifting the fresh-keeping box, so that the fresh-keeping film is provided with one more end, the traction motor can firstly wind up the redundant fresh-keeping film at one end through the traction shaft when working, then pulls the fresh-keeping film, and the fresh-keeping film can be prevented from being pulled along with the traction motor by the aid of the sleeve arrangement due to the fact that the fresh-keeping film is sticky, and the fresh-keeping film of a shearing part is prevented from being pulled due to the fact that the traction motor rotates along with the follow-up shaft in the process of winding up the redundant fresh-keeping film.

4. The crank rocker mechanism is driven by a single motor to move, so that the transverse cutting plate and the longitudinal rod are driven to reciprocate when the single motor rotates unidirectionally, at least three groups of motors are required to drive the film sealing mechanism to move simultaneously, and the film sealing mechanism is realized to reciprocate through the forward and reverse rotation of the control motor.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a vegetable film sealing device based on a crank and rocker mechanism;

FIG. 2 is a schematic diagram of the overall component mounting structure of a vegetable film sealing device based on a crank and rocker mechanism;

FIG. 3 is a top view of a film sealing assembly of a vegetable film sealing device based on a crank and rocker mechanism of the invention;

FIG. 4 is a schematic diagram of an eccentric wheel structure of a vegetable film sealing device based on a crank and rocker mechanism;

FIG. 5 is a schematic drawing of a traction assembly of a vegetable film sealing device based on a crank and rocker mechanism;

FIG. 6 is a schematic diagram of a rotary shaft structure of a vegetable film sealing device based on a crank and rocker mechanism;

fig. 7 is a schematic diagram of a structure of a vitex wheel of a vegetable film sealing device based on a crank and rocker mechanism;

FIG. 8 is a schematic diagram of the natural state structure of a worm wheel of a vegetable film sealing device based on a crank and rocker mechanism;

fig. 9 is a schematic diagram of a compressed worm gear structure of a vegetable film sealing device based on a crank-rocker mechanism;

FIG. 10 is a front view of a wheel housing of a vegetable film sealing device based on a crank and rocker mechanism of the present invention;

fig. 11 is a right side cross-sectional view of a wheel housing of a vegetable film sealing device based on a crank and rocker mechanism.

The reference numerals are as follows: 1. a housing; 2. a film sealing mechanism; 3. a film pulling mechanism; 4. a supporting and delivering cylinder; 1-1, a vertical plate; 1-2, a transverse plate; 1-3, a bearing plate; 2-11, a screw rod; 2-12, transverse cutting plates; 2-13, a longitudinal rod; 2-14, a supporting plate; 2-15, longitudinal plates; 2-16, a chute; 2-17, a slide bar; 2-18, a lantern ring; 2-19, extension rod; 2-191, extension connecting rods; 2-192, extension sleeves; 2-21, a power machine; 2-22, a rotating shaft; 2-23, eccentric wheel; 2-24, crank; 2-25, rocker; 2-26, an extension case; 2-27, pushing plate; 2-28, an air bag; 2-29, connecting rod; 3-3, a brake; 3-4, a vitex wheel; 3-11, a traction shaft; 3-12, traction motor; 3-13, a gear transmission group; 3-14, a shaft support plate; 3-15 parts of worm; 3-21, a follow-up shaft; 3-22, worm gear; 3-23, limiting plates; 3-24, sleeve; 3-25, driven plate; 3-26, reaction plate; 3-27, a resistance plate; 3-221, wheel shell; 3-222, a gear ring; 3-223, rotating ring; 3-224, ring groove; 3-225, a fixed ring; 3-226, pushing blocks; 3-227, a baffle plate; 3-228, a sliding block; 3-229, da Jing claws; 3-230, vitex rotundifolia; 3-31, the stopper II.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Examples: as shown in fig. 1-11, a vegetable film sealing device based on a crank-rocker mechanism comprises a shell 1, a film sealing mechanism 2 and a film pulling mechanism 3, wherein the film sealing mechanism 2 and the film pulling mechanism 3 are sequentially arranged in the shell 1 from left to right, the film pulling mechanism 3 utilizes a worm gear mechanism to enable a preservative film to be unfolded, the film sealing mechanism 2 utilizes the crank-rocker mechanism to enable the preservative film to be packaged on a vegetable preservative box, and the film sealing mechanism 2 utilizes the crank-rocker mechanism to cut the preservative film from four different directions.

The film sealing device also comprises a control system, and the control system enables the position of the fresh-keeping box to be detected and controls all electrical equipment in the device.

The inside of the shell 1 is also fixed with a supporting air cylinder 4 through screws, the supporting air cylinder 4 is positioned below the film pulling mechanism 3, a vertical plate 1-1 is welded in the shell 1, the vertical plate 1-1 divides the shell 1 into a power space and a film sealing space, two groups of transverse plates 1-2 are sequentially fixed in the power space through screws from top to bottom, a bearing plate 1-3 is horizontally fixed in the film sealing space through screws, a through groove is machined in the position, right above the supporting air cylinder 4, of the bearing plate 1-3, and the fresh-keeping box is lifted to the position above the film sealing mechanism 2 through the through groove by the supporting air cylinder 4.

The film sealing mechanism 2 comprises a power component and a film sealing component 2-1, wherein the power component is arranged in a power space, the power component is rotationally connected with the film sealing component 2-1, and the film sealing component 2-1 is arranged above the bearing plate 1-3;

the sealing membrane component 2-1 comprises at least two groups of longitudinal rods 2-13, at least two groups of support plates 2-14 and at least four groups of longitudinal plates 2-15, wherein the two groups of support plates 2-14 are fixed on the bearing plate 1-3 through screws, at least two groups of screw rods 2-11 are rotatably arranged on the two groups of support plates 2-14, the two groups of screw rods 2-11 are positioned at two sides of a through groove of the bearing plate 1-3, the two groups of transverse plates 2-12 are symmetrically arranged on the two groups of screw rods 2-11, the lower ends of the two groups of transverse plates 2-12 are opposite in screw thread direction, when the screw rods 2-11 rotate forwards, the two groups of transverse plates 2-12 are close to each other, when the screw rods 2-11 rotate reversely, the two groups of transverse plates 2-12 are far away from each other, and when the two groups of transverse plates 2-12 do not work, the through groove cannot be blocked, the lower ends of the transverse cutting boards 2-12 are in screw transmission with the screw rods 2-11, the upper end surfaces of the two groups of transverse cutting boards 2-12 are symmetrically provided with sliding grooves 2-16, one group of transverse cutting boards 2-12 close to one side of the vertical board 1-1 are rotationally connected with the power assembly, four groups of longitudinal boards 2-15 are welded on the vertical board 1-1 and the inner wall of the shell 1 respectively, sliding rods 2-17 are welded between the two groups of longitudinal boards 2-15, lantern rings 2-18 are welded at the two ends of the two groups of longitudinal bars 2-13, the lantern rings 2-18 are sleeved on the sliding rods 2-17, the two groups of longitudinal bars 2-13 are symmetrically provided with two groups of idler wheels, the idler wheels are fixed on the longitudinal bars 2-13 through screws and are positioned in the sliding grooves 2-16 in a split manner, the idler wheels slide in the sliding grooves 2-16, the two groups of longitudinal rods 2-13 are rotatably connected with the two groups of transverse cutting plates 2-12 through rollers and sliding grooves 2-16, when the two groups of transverse cutting plates 2-12 are close to each other, the two groups of longitudinal rods 2-13 are close to each other, and when the two groups of transverse cutting plates 2-12 are far away from each other, the two groups of longitudinal rods 2-13 are far away from each other.

The transverse cutting plate 2-12 near one side of the vertical plate 1-1 is fixedly provided with an extension rod 2-19 through a screw, the joint of the extension rod 2-19 and the transverse cutting plate 2-12 is sealed, the extension rod 2-19 comprises an extension connecting rod 2-191 and an extension sleeve 2-192 sleeved on the extension connecting rod 2-191, one end of the extension connecting rod 2-191 is rotatably connected with a power assembly, a pushing ring is welded on the extension connecting rod 2-191 and positioned at the outer side of the extension sleeve 2-192, the other end of the extension connecting rod 2-191 is welded with an extension plate, the extension plate is positioned inside the extension sleeve 2-192 and is in sliding connection with the extension sleeve 2-192, a plurality of groups of springs are arranged between the extension plate and the extension sleeve 2-192, the extension plate is tightly connected with the inner surface of the extension sleeve 2-192, the extension plate is mutually matched with the extension sleeve 2-192 and the transverse cutting plate 2-12 to form an extension space inside the extension sleeve 2-192, one end of the extension sleeve 2-192 near the transverse cutting plate 2-12 is provided with a vent, and the extension sleeve 2-192 is connected with a pipeline through the vent hole and the extension sleeve 2-26.

The power assembly comprises a power machine 2-21, a rocker 2-25 and an extension shell 2-26, wherein the power machine 2-21 is fixed on the lower end face inside the shell 1 through screws, the power machine 2-21 is a device for converting electric energy and potential energy into mechanical energy, such as a motor and a motor, in the embodiment, the power machine is preferably a motor, the power machine 2-21 is collectively called as the motor 2-21 below, a motor shaft of the motor 2-21 is connected with a rotating shaft 2-22 through a coupling, a crank 2-24 and an eccentric wheel 2-23 are fixedly arranged on the rotating shaft 2-22 from top to bottom in sequence, the eccentric wheel 2-23 is positioned between two groups of transverse plates 1-2, the extension shell 2-26 is positioned between the two groups of transverse plates 1-2 and is fixed with the vertical plates 1-1 through screws, the upper end face of the crank 2-24 is provided with a fixed column, the rocker 2-25 is rotationally connected with the crank 2-24 through the fixed column, the rocker 2-25 penetrates through the vertical plates 1-1, and the other end of the rocker 2-25 is rotationally connected with the extension connecting rod 2-191.

The shell of the extension shell 2-26 is provided with a through groove, the extension shell 2-26 is internally and sequentially provided with a pushing plate 2-27 and an air bag 2-28 from left to right, when the eccentric wheel 2-23 moves leftwards, the pushing plate 2-27 is in adhesive connection with the air bag 2-28, one side of the pushing plate 2-27, which is close to the eccentric wheel 2-23, is symmetrically welded with a connecting rod 2-29, the air bag 2-28 is provided with an air inlet hole and an air outlet hole, a one-way valve is arranged in the air inlet hole, the outer side of the air outlet hole is connected with a pipeline, the air bag 2-28 is connected with an extension shell 2-192 through the pipeline and an air vent, when the eccentric wheel 2-23 moves rightwards, the eccentric wheel 2-23 extrudes the air bag 2-28 through the connecting rod 2-29, when the eccentric wheel 2-23 moves leftwards, the eccentric wheel 2-23 stretches the air bag 2-28 through the connecting rod 2-29, the air bag 2-28 transmits air into the extension shell 2-192 through the pipeline, the upper end face and the lower end face of the eccentric wheel 2-23 are both provided with a chute, the two groups of the eccentric wheel 2-23 are connected with the connecting rod 2-23 through the connecting rod 2-29, and the eccentric wheel 2-23 rotates in the two groups 2-23 and the chute 2-23 is connected with the eccentric wheel 2-23 through the connecting rod 2-23.

Further optimizing, the symmetry axis of the crank 2-24 and the symmetry axis of the eccentric wheel 2-23 are on the same vertical plane, when the crank 2-24 enables the rocker 2-25 to move rightwards to the maximum distance, the extrusion degree of the eccentric wheel 2-23 to the air bag 2-28 is the maximum, and the motor 2-21 utilizes the crank rocker mechanism to realize the unidirectional rotation to cut the preservative film in four different directions.

The film pulling mechanism 3 comprises a traction assembly, a rotating shaft and a blocking device 3-3, wherein the rotating shaft is rotationally connected with the traction assembly, one end of the blocking device 3-3 is fixed on the vertical plate 1-1 through a screw, the blocking device 3-3 is an electric telescopic cylinder, the blocking device 3-3 is hereinafter collectively called as the electric telescopic cylinder 3-3, and a telescopic rod of the electric telescopic cylinder 3-3 is rotationally connected with the rotating shaft.

The traction assembly comprises a traction shaft 3-11, a traction motor 3-12, a gear transmission group 3-13 and at least four groups of shaft supporting plates 3-14, wherein the traction motor 3-12 is a servo motor without self-locking, the four groups of shaft supporting plates 3-14 are fixed on the vertical plate 1-1 and the inner wall of the shell 1 through screws in pairs, a rotating shaft is rotatably arranged on the two groups of shaft supporting plates 3-14 on the vertical plate 1-1, the traction shaft 3-11 is rotatably arranged on the two groups of shaft supporting plates 3-14 on the inner wall of the shell 1, the traction motor 3-12 is fixed on the inner wall of the shell 1 through screws, the traction motor 3-12 is connected with the traction shaft 3-11 through screws, a bevel gear is fixed on a motor shaft of the traction motor 3-12 through screws, one end of the gear transmission group 3-13 is rotatably connected with the bevel gear, and the other end of the gear transmission group 3-13 is fixedly provided with a worm 3-15.

Further optimizing, install two sets of vitex wheel 3-4 on the traction shaft 3-11, and the cover shell is installed to the outside of vitex wheel 3-4, there is another group of stopper II number 3-31 that is electric telescopic cylinder II number 3-31 through the screw fixation in one side of cover shell, be fixed with the brake block on the telescopic link of this electric telescopic cylinder II number 3-31, when traction motor 3-12 is inoperative, electric telescopic cylinder II number 3-31 is during operation, the brake block contacts with the cover shell and prevents the rotation of cover shell, when traction motor 3-12 is during operation, electric telescopic cylinder II number 3-31 is inoperative, the telescopic link is withdrawn, the brake block breaks away from with the cover shell, the cover shell can rotate under the drive of traction shaft 3-11.

Further optimized, the gear transmission group 3-13 comprises a plurality of groups of support plates fixed on the shell 1, a plurality of groups of transmission shafts rotatably mounted on the support, bevel gears, worm gears and worms 3-15, wherein the bevel gears are fixedly mounted on the transmission shafts and are in transmission connection with the bevel gears on the traction motors 3-12, and the worm gears are mounted on different transmission shafts for transmitting power to the traction motors 3-12.

The rotating shaft comprises a follow-up shaft 3-21 and a worm wheel 3-22, wherein the follow-up shaft 3-21 is sequentially rotatably provided with a shaft supporting plate 3-14, a limiting plate 3-23, a sleeve 3-24, a driven plate 3-25, a reaction plate 3-26 and a rotating shaft supporting plate 3-14 from left to right, a plurality of groups of springs are arranged between the reaction plate 3-26 and the shaft supporting plate 3-14, the sleeve 3-24 is sleeved on the follow-up shaft 3-21, the driven plate 3-25 is positioned in the sleeve 3-24, a linkage plate is welded on the outer surface of one side of the sleeve 3-24 close to the limiting plate 3-23, a linkage half bead is welded on the end surface of one side of the linkage plate far away from the limiting plate 3-23, gear teeth are machined on the inner surface of the sleeve 3-24 close to the end surface of one side of the limiting plate 3-23, the end face of the driven plate 3-25, which is close to one side of the limiting plate 3-23, is provided with gear teeth, the sleeve 3-24 can be meshed with the gear teeth on the driven plate 3-25, threads are arranged on the outer surface of the sleeve 3-24, threads are arranged on the inner surface of the worm wheel 3-22, the worm wheel 3-22 is sleeved on the sleeve 3-24 and is rotationally connected with the sleeve 3-24 through the threads, the two sides of the worm wheel 3-22 are provided with the resistance plates 3-27, the resistance plates 3-27 are fixed on the vertical plate 1-1 through screws, the upper end of the worm wheel 3-22 is rotationally connected with the worm 3-15, the limiting plate 3-23 is provided with limiting holes, the aperture of each limiting hole is identical with the diameter of a telescopic rod in the electric telescopic cylinder 3-3, and when the traction motor 3-12 works, when the electric telescopic cylinder 3-3 does not work, the telescopic rod is retracted into the electric telescopic cylinder 3-3, the limiting plate 3-23 can rotate freely along with the follow-up shaft 3-21, when the traction motor 3-12 does not work and the electric telescopic cylinder 3-3 works, the telescopic rod stretches out and contacts with the limiting plate 3-23, and when the limiting plate 3-23 rotates and enables the limiting hole to be located below the telescopic rod, the telescopic rod is inserted into the limiting hole and limits the rotation of the limiting plate 3-23, so that the rotation of the follow-up shaft 3-21 is limited.

The worm wheel 3-22 comprises two groups of wheel shells 3-221, a gear ring 3-222 and a rotating ring 3-223, wherein a bead groove is formed in the outer wall of the wheel shell 3-221 close to one side of the limiting plate 3-23, the position of the bead groove corresponds to that of a linkage half bead, two groups of annular grooves 3-224 are formed in the opposite side end faces of the two groups of wheel shells 3-221, the gear ring 3-222 and the rotating ring 3-223 are respectively located in the two groups of annular grooves 3-224, the diameter of the rotating ring 3-223 is smaller than that of the gear ring 3-222, the rotating ring 3-223 is located in the gear ring 3-222, the gear ring 3-222 and the rotating ring 3-223 are in rotary connection with the wheel shell 3-221 through the annular grooves 3-224, gear teeth are arranged on the outer surface of the gear ring 3-222, the gear ring 3-222 is in rotary connection with the worm 3-15, the rotating ring 3-223 is in rotary connection with the sleeve 3-24, and the fixed ring 3-225 is welded between the gear ring 3-222 and the rotating ring 3-223.

A plurality of groups of pushing blocks 3-226 are machined on the inner surface of a gear ring 3-222, sliding grooves are machined on the inner wall of a gear shell 3-221, supporting columns are welded at positions, corresponding to the sliding grooves, of the pushing blocks 3-226, the supporting columns are located in the sliding grooves, the gear shell 3-221 limits rotation of the gear ring 3-222 through the sliding grooves, a plurality of groups of through grooves are machined on a fixed ring 3-225, a plurality of groups of baffle plates 3-227 are welded on the outer surface of the fixed ring 3-225, the baffle plates 3-227 are located on one side of the through grooves, a plurality of groups of sliding blocks 3-228 are slidably installed between the gear ring 3-222 and the fixed ring 3-225, the baffle plates 3-227 are in one-to-one correspondence with the sliding blocks 3-228, springs are arranged between the baffle plates 3-227 and the sliding blocks 3-228, two ends of each spring are respectively connected with the baffle plates 3-227 and the sliding blocks 3-228, a plurality of groups of sliding blocks 3-228 are rotatably installed on one side, which is contacted with the fixed ring 3-225, a plurality of baffle plates da Jing are welded on one side of the fixed ring 3-229, a plurality of baffle plates da Jing are rotatably arranged on one side of the baffle plates, the baffle plates are rotatably arranged on one side of the fixed ring 3-229, a plurality of groups of the baffle plates are rotatably arranged on one side of the baffle plates, the baffle plates are rotatably arranged on one side of the other, and are closely to one side of the baffle plates 3-225, and are rotatably arranged on one side of the other side of the baffle plates 3-225, and are rotatably arranged on one side, and are closely, and are rotatably, and are in contact with one side.

The working principle of the invention is as follows:

and (3) installing a brand new preservative film roll on the rotating shaft, installing an empty preservative film roll on the casing of the traction shaft 3-11, and drawing a section of preservative film roll out of the brand new preservative film roll to be fixed on the empty preservative film roll.

When the traction motor 3-12 is not in operation and the electric telescopic cylinder II number 3-31 is in operation, the brake block is in contact with the casing and prevents the rotation of the casing, when the traction motor 3-12 is in operation and the electric telescopic cylinder II number 3-31 is not in operation, the telescopic rod is retracted, the brake block is separated from the casing, and the casing can rotate under the drive of the traction shaft 3-11. Meanwhile, when the traction motor 3-12 drives the traction shaft 3-11 to rotate, the electric telescopic cylinder 3-3 does not work and withdraws the telescopic rod from the limiting hole, when the traction motor 3-12 drives the traction shaft 3-11 to rotate, the traction shaft 3-11 drives the empty preservative film roll to rotate through the casing, meanwhile, the traction motor 3-12 drives the follow-up shaft 3-21 to rotate through the bevel gear, the gear transmission group 3-13 and the worm gear 3-22, and the brand-new preservative film roll starts to rotate through the rotation of the follow-up shaft 3-21, and the preservative film is unfolded between the traction shaft 3-11 and the rotating shaft when the empty preservative film roll and the brand-new preservative film roll rotate.

When the gear transmission group 3-13 drives the worm wheel 3-22 to rotate, the transmission rod drives the worm 3-15 to rotate, when the worm 3-15 rotates, the gear ring 3-222 rotates in the wheel shell 3-221 under the drive of the worm 3-15, as the two sides of the wheel shell 3-221 are provided with the resistance plates 3-27, the wheel shell 3-221 can receive a certain rotation resistance, the gear ring 3-222 drives the push block 3-226 to rotate in the wheel shell 3-221, the push block 3-226 pushes the sliding block 3-228, the spring is compressed, the large-size claw 3-229 passes through the through groove to contact with the small-size claw 3-230, after the small-size claw 3-230 contacts with the da Jing claw 3-229, the rotation power on the gear ring 3-222 is transmitted to the rotating ring 3-223 through the small-230 and da Jing claws 3-229, when the rotating ring 3-223 drives the sleeve 3-24 to rotate, the rotating resistance transmitted by the sleeve 3-24 is received by the rotating ring 3-230, the large-size claw 3-229 is completely contacted with the small-size claw 3-229, and the small-size claw 3-229 is completely contacted with the small-size claw 3-230, and the small-size claw 3-229 is completely contacted with the small-size claw 3-229, and the small-size claw 3-229 is completely contacted with the small-3-size claw 3-229.

When the rotating ring 3-223 starts to rotate, the sleeve 3-24 moves leftwards on the follow-up shaft 3-21 under the drive of the rotating ring 3-223, the reaction plate 3-26 is extruded to enable the reaction plate 3-26 to move leftwards on the follow-up shaft 3-21, the spring is compressed, and when the sleeve 3-24 moves to the left end, the linkage hemi-beads are inserted into the bead grooves, and gear teeth on the sleeve 3-24 and the follow-up plate 3-25 can be meshed, the worm wheel 3-22 drives the follow-up shaft 3-21 to rotate through the sleeve 3-24.

When the traction motor 3-12 stops working, the sliding block 3-228 reversely pushes the pushing block 3-226 under the pushing of the spring, the pushing block 3-226 is pushed by the sliding block 3-228 to drive the gear ring 3-222 to rotate reversely, and the worm 3-15 can be driven to rotate reversely when the traction motor 3-12 rotates reversely due to the fact that the gear ring 3-222 does not have self-locking, so that the big-wattle claw 3-229 is separated from contact with the small-wattle claw 3-230 and is retracted into the through groove, the rotating ring 3-223 can rotate reversely in the worm wheel 3-22, and meanwhile, the electric telescopic cylinder 3-3 starts to work to enable the telescopic rod to extend and contact with the limiting plate 3-23.

Because the rotating ring 3-223 can be reversed, when the reaction plate 3-26 pushes the sleeve 3-24 reversely under the pushing of the spring, the sleeve 3-24 can move to the right on the follow-up shaft 3-21, and one end of the sleeve 3-24 moves to a position contacted with the limit plate 3-23, so that the follow-up shaft 3-21 can rotate freely.

The fresh-keeping box with vegetables is placed on the supporting and air-supplying cylinder 4, the fresh-keeping box is lifted to the upper side of the vertical rod 2-13 by the lifting cylinder 4, the fresh-keeping box is contacted with the fresh-keeping film in the process of lifting the fresh-keeping box by the lifting cylinder 4, the fresh-keeping film is pulled out of the brand-new fresh-keeping film roll by the lifting of the lifting cylinder 4, when the fresh-keeping film is pulled out of the brand-new fresh-keeping film roll, the brand-new fresh-keeping film roll moves the follow-up shaft 3-21 to rotate, so that the follow-up shaft 3-21 drives the limiting plate 3-23 to rotate, the fresh-keeping film can be pulled out for a section in order to prevent the fresh-keeping film from being pulled too tightly in the lifting process, and after the fresh-keeping film is pulled out for a distance, the telescopic rod is reinserted into the limiting hole of the limiting plate 3-23, and the follow-up shaft 3-21 stops rotating.

When the lifting cylinder 4 lifts the fresh-keeping box to the position above the longitudinal rods 2-13, the motor 2-21 drives the crank 2-24 and the eccentric wheel 2-23 to rotate through the rotating shaft 2-22, the crank 2-24 drives the rocker 2-25 to rotate, the rocker 2-25 converts circular motion into straight motion and transmits power to the extension connecting rod 2-191, the extension connecting rod 2-191 pushes the transverse cutting plates 2-12 to move on the screw rod 2-11 through the extension casing 2-192, at the moment, the screw rod 2-11 rotates positively, the two groups of transverse cutting plates 2-12 are close to each other, and the two groups of longitudinal rods 2-13 are close to each other.

When the crank 2-24 moves the extension rod 2-19 rightwards by the rocker 2-25 to the maximum distance, the extrusion degree of the eccentric wheel 2-23 to the air bag 2-28 is the maximum, so that all air in the air bag 2-28 enters the extension space, the air pressure in the extension space is increased, the extension sleeve shell 2-192 moves rightwards on the extension connecting rod 2-191 again, the transverse cutting plate 2-12 moves rightwards by one end distance on the screw rod 2-11 again, the two groups of longitudinal rods 2-13 are abutted together to longitudinally extrude the preservative film, and the two groups of transverse cutting plates 2-12 are abutted against each other to transversely cut the preservative film.

When the packaged fresh-keeping box is taken away, and the lifting cylinder 4 returns to the original position again, as the lifting cylinder 4 pulls the fresh-keeping film when lifting the fresh-keeping box, one end of the fresh-keeping film is added, the traction motor 3-12 rolls up the redundant fresh-keeping film at one end through the traction shaft 3-11 when working, then pulls the new fresh-keeping film, in order to prevent the follow-up shaft 3-21 from rotating along with the traction motor 3-12 in the process of rolling up the redundant fresh-keeping film, the traction motor 3-12 can enable the sleeve 3-24 to move leftwards on the follow-up shaft 3-21 through the worm wheel 3-22, and after the redundant fresh-keeping film is collected, the sleeve 3-24 just moves to the left end and is meshed with the follow-up shaft 3-21 through the gear.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. Vegetable film sealing device based on crank rocker mechanism, its characterized in that: the vegetable film sealing device comprises a shell (1), a film sealing mechanism (2) and a film pulling mechanism (3), wherein the film sealing mechanism (2) and the film pulling mechanism (3) are sequentially arranged in the shell (1) from left to right, the film pulling mechanism (3) utilizes a worm gear mechanism to enable a preservative film to be unfolded, the film sealing mechanism (2) utilizes a crank rocker mechanism to enable the preservative film to be packaged on a vegetable preservative box, and the film sealing mechanism (2) utilizes the crank rocker mechanism to cut the preservative film from four different directions;

the automatic film drawing machine is characterized in that a supporting and conveying air cylinder (4) is further arranged in the shell (1), the supporting and conveying air cylinder (4) is located below the film drawing mechanism (3), a vertical plate (1-1) is arranged in the shell (1), the vertical plate (1-1) divides the shell (1) into a power space and a film sealing space, two groups of transverse plates (1-2) are sequentially arranged in the power space from top to bottom, and a bearing plate (1-3) is horizontally arranged in the film sealing space; the film sealing mechanism (2) comprises a power component and a film sealing component (2-1), wherein the power component is arranged in a power space, the power component is rotationally connected with the film sealing component (2-1), and the film sealing component (2-1) is arranged above the bearing plate (1-3); the film pulling mechanism (3) comprises a traction assembly, a rotating shaft and a blocker (3-3), wherein the rotating shaft is rotationally connected with the traction assembly, and the rotating shaft is rotationally connected with the blocker (3-3);

the power assembly comprises a power machine (2-21), a rocker (2-25) and an extension shell (2-26), wherein the power machine (2-21) is arranged on the lower end face in the shell (1), a rotating shaft (2-22) is arranged on the power machine (2-21), a crank (2-24) and an eccentric wheel (2-23) are sequentially arranged on the rotating shaft (2-22) from top to bottom, the eccentric wheel (2-23) is positioned between two groups of transverse plates (1-2), the extension shell (2-26) is positioned between the two groups of transverse plates (1-2) and is fixed with the vertical plate (1-1), the eccentric wheel (2-23) is in rotary connection with the extension shell (2-26), the crank (2-24) is in rotary connection with the rocker (2-25), and the other end of the rocker (2-25) is in rotary connection with the sealing membrane assembly (2-1);

the traction assembly comprises a traction shaft (3-11), a traction motor (3-12), a gear transmission group (3-13) and at least four groups of shaft support plates (3-14), wherein the four groups of shaft support plates (3-14) are arranged on the inner wall of a vertical plate (1-1) and the inner wall of a shell (1) respectively, rotating shafts are arranged on the two groups of shaft support plates (3-14) on the vertical plate (1-1), the traction shaft (3-11) is arranged on the two groups of shaft support plates (3-14) on the inner wall of the shell (1), the traction motor (3-12) is arranged on the inner wall of the shell (1), the traction motor (3-12) is connected with the traction shaft (3-11) in a shaft mode, a bevel gear is arranged on the traction motor (3-12), one end of the gear transmission group (3-13) is connected with the bevel gear in a rotating mode, a worm (3-15) is arranged on the other end of the gear transmission group (3-13), and the worm (3-15) is connected with the rotating shafts in a rotating mode.

The novel multifunctional bicycle is characterized in that through grooves are formed in a shell of the extension shell (2-26), a pushing plate (2-27) and an air bag (2-28) are sequentially arranged in the extension shell (2-26) from left to right, connecting rods (2-29) are symmetrically arranged on one side, close to the eccentric wheel (2-23), of the pushing plate (2-27), sliding grooves are formed in the upper end face and the lower end face of the eccentric wheel (2-23), two groups of connecting rods (2-29) are L-shaped, the L ends of the two groups of connecting rods (2-29) are located in the sliding grooves, the two groups of connecting rods (2-29) are in rotary connection with the eccentric wheel (2-23) through the sliding grooves, the pushing plate (2-27) is in rotary connection with the eccentric wheel (2-23) through the connecting rods (2-29) and the sliding grooves, and the extending shell (2-26) is in rotary connection with the eccentric wheel (2-23) through the pushing plate (2-27) and the sliding grooves;

the film sealing component (2-1) comprises at least two groups of longitudinal rods (2-13), at least two groups of supporting plates (2-14) and at least four groups of longitudinal plates (2-15), at least two groups of screw rods (2-11) are arranged on the two groups of supporting plates (2-14), two groups of transverse plates (2-12) are symmetrically arranged on the screw rods (2-11), sliding grooves (2-16) are symmetrically arranged on the upper end surfaces of the two groups of transverse plates (2-12), one group of transverse plates (2-12) close to one side of the vertical plates (1-1) are rotationally connected with rocking bars (2-25), four groups of longitudinal plates (2-15) are arranged on the inner walls of the vertical plates (1-1) and the outer shell (1) respectively, sliding rods (2-17) are arranged between the two groups of longitudinal plates (2-15), lantern rings (2-18) are respectively arranged at the two ends of the two groups of the longitudinal plates (2-13), the lantern rings (2-18) are sleeved on the sliding rods (2-17), the two groups of longitudinal plates (2-16) are rotationally connected with the sliding grooves (16) and are rotationally connected with the rolling wheels (2-16), the two groups of longitudinal rods (2-13) are rotatably connected with the two groups of transverse cutting plates (2-12) through rollers and sliding grooves (2-16);

the rotating shaft comprises a follow-up shaft (3-21) and a worm wheel (3-22), wherein the follow-up shaft (3-21) is sequentially provided with a shaft supporting plate (3-14), a limiting plate (3-23), a sleeve (3-24), a driven plate (3-25), a reaction plate (3-26) and the shaft supporting plate (3-14) from left to right, the sleeve (3-24) is sleeved on the follow-up shaft (3-21), the driven plate (3-25) is positioned in the sleeve (3-24), the worm wheel (3-22) is sleeved on the sleeve (3-24) and is rotationally connected with the sleeve (3-24), the two sides of the worm wheel (3-22) are provided with a resistance plate (3-27), the worm wheel (3-22) is rotationally connected with a worm (3-15), and the limiting plate (3-23) is rotationally connected with a stopper (3-3).

The worm gear (3-22) comprises two groups of wheel shells (3-221), gear rings (3-222) and rotating rings (3-223), two groups of ring grooves (3-224) are formed in opposite side end faces of the wheel shells (3-221), the gear rings (3-222) and the rotating rings (3-223) are respectively located in the two groups of ring grooves (3-224), the diameter of the rotating rings (3-223) is smaller than that of the gear rings (3-222), the rotating rings (3-223) are located in the gear rings (3-222), the gear rings (3-222) and the rotating rings (3-223) are in rotary connection with the wheel shells (3-221), the gear rings (3-222) are in rotary connection with the worm (3-15), the rotating rings (3-223) are in rotary connection with the sleeve (3-24), and the fixed rings (3-225) are arranged between the gear rings (3-222) and the rotating rings (3-223).