CN114562546A

CN114562546A - Stabilize heat dissipation and crashproof planetary reducer

Info

Publication number: CN114562546A
Application number: CN202210309159.6A
Authority: CN
Inventors: 阳选伟
Original assignee: Shenzhen Weihui Automation Technology Co ltd
Current assignee: Shenzhen Weihui Automation Technology Co ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-05-31

Abstract

The invention relates to the technical field of planetary speed reducers, in particular to a planetary speed reducer with stable heat dissipation and collision prevention, which comprises: the planetary reducer comprises a planetary reducer body, wherein the planetary reducer body comprises a casing, a planetary wheel is mounted inside the casing, an inner gear ring is fixedly mounted on the inner wall of the casing, mounting grooves are formed in two sides of the inner gear ring, a broken groove is formed in the rotating ring, a scraping rod is fixedly mounted on the inner wall of the rotating ring, a clamping groove is formed in the outer wall of the rotating ring, and a fixing rod is fixedly connected between the rotating ring and the planetary wheel. According to the planetary reducer, the scraping rod and the collecting groove are arranged, so that a thickening agent and extruded base oil at the joint of the inner gear ring and the planet wheel can be collected, the clean environment in the shell is kept, the normal operation and heat dissipation of the planetary reducer body are guaranteed, and the base oil can be sucked back by the thickening agent again, so that the waste is reduced.

Description

Stabilize heat dissipation and crashproof planetary reducer

Technical Field

The invention relates to the technical field of planetary speed reducers, in particular to a planetary speed reducer which is stable in heat dissipation and capable of preventing collision.

Background

The planetary reducer is an industrial product with wide application, and a motor is usually mounted at an input end of the planetary reducer, and the planetary reducer mainly plays a role in reducing the rotating speed, increasing the torque and reducing the rotational inertia ratio of a load to the motor. When the planetary reducer is used, lubricating grease is needed to reduce friction and abrasion among mechanical transmission parts, improve the transmission efficiency of the machine, and play roles in vibration absorption, cooling, temperature reduction, heat dissipation, rust prevention, noise reduction and the like.

However, the grease is affected by the high temperature inside the casing for a long time, so that the base oil contained in the grease is accelerated to be separated out, and after the base oil runs off from the inside of the grease, the base oil is left with a thickening agent, and is dried and hardened, so that the mechanical transmission efficiency of the speed reducer is lowered, the heat dissipation effect is deteriorated, the grease cannot function, and the normal use of the planetary speed reducer is affected.

Therefore, in order to solve the above problems, a planetary reducer that stably dissipates heat and resists collision has been proposed.

Disclosure of Invention

The invention aims to provide a planetary reducer with stable heat dissipation and collision avoidance, and aims to solve the problems that base oil contained in lubricating grease is accelerated to separate out due to the fact that lubricating grease provided by the background technology is influenced by high temperature in a shell for a long time, and after the base oil is lost from the lubricating grease, a thickening agent is left, and the lubricating grease is dried and hardened, so that the lubricating grease cannot play a role, the mechanical transmission efficiency of the reducer is lowered, the heat dissipation effect is poor, and the normal use of the planetary reducer is influenced.

In order to achieve the purpose, the invention provides the following technical scheme: a stabilize heat dissipation and crashproof planetary reducer includes:

the planetary reducer comprises a planetary reducer body, wherein the planetary reducer body comprises a casing, a planetary wheel is arranged in the casing, an inner gear ring is fixedly arranged on the inner wall of the casing, and mounting grooves are formed in two sides of the inner gear ring;

the cleaning structure comprises a rotating ring, the rotating ring is slidably mounted inside the mounting groove, a broken groove is formed in the rotating ring, a scraping rod is fixedly mounted on the inner wall of the rotating ring, a clamping groove is formed in the outer wall of the rotating ring, and a fixing rod is fixedly connected between the rotating ring and the planet wheel;

collect the structure, collect the structure including the installation piece, installation piece fixed mounting is on the inner wall of casing, the sliding tray has been seted up to the top surface of installation piece, the collecting vat has been seted up to the bottom surface of sliding tray, the bottom surface fixedly connected with pipe of installation piece, the top surface movable mounting of installation piece has scrapes the piece, scrape the first spring of bottom surface fixedly connected with of piece.

Preferably, the structure pushes down includes the fixed block, fixed block fixed mounting is at the top surface of installation piece, the inboard slidable mounting of fixed block has the slide, fixedly connected with second spring on the lateral wall of slide, the top surface fixed mounting of slide has the microcylinder, the bottom fixedly connected with clamp plate of microcylinder, the venthole has been seted up to the top surface of clamp plate, the lead screw is installed to one side of microcylinder, slidable mounting has the lifter plate on the lateral wall of clamp plate, slidable mounting has the scraper blade on the lateral wall of lifter plate, fixedly connected with fourth spring on the lateral wall of scraper blade.

Preferably, linkage structure includes the fixed plate, fixed plate fixed mounting is in the inside of casing, the top surface slidable mounting of fixed plate has the slider, the both ends movable mounting of slider has the card post, the bottom fixedly connected with fifth spring of card post, fixedly connected with connects the rope on the both sides wall of slider, the middle part winding of connecting the rope has the pulley.

Preferably, the rotating rings are two groups in total, the scraping rods are installed in an inclined mode, the side walls of the scraping rods are attached to the side walls of the inner gear ring, the installation blocks are located on the right lower side of the rotating rings, and the top ends of the scraping blocks are inserted into the inner side of the rotating rings through the broken grooves.

Preferably, the tail end of the guide pipe is located inside the collecting groove, the top end of the guide pipe is located on one side of the inner gear ring, and one end of the first spring is fixedly connected with the inner wall of the mounting block.

Preferably, the slide slidable mounting is in the inside of sliding tray, the tip of second spring and the inner wall fixed connection of fixed block, the output of miniature cylinder is located the bottom surface of slide, the inside fixed mounting of venthole has ventilative waterproof membrane.

Preferably, the end part of the screw rod is fixedly connected with the micro motor, the screw rod is in threaded connection with the lifting plate, the side wall of the scraping plate is attached to the side wall of the scraping block, and the end part of the fourth spring is fixedly connected with the inner wall of the lifting plate.

Preferably, the fixed plate is located on the lower side of the inner gear ring, a third spring is connected between the sliding block and the fixed plate, the end of the fifth spring is fixedly connected with the sliding block, the top end of the clamping column is inserted into the clamping groove, the pulley is rotatably installed inside the machine shell, and the end of the connecting rope is fixedly connected with the side wall of the sliding plate.

Compared with the prior art, the invention has the beneficial effects that: according to the planetary reducer, the scraping rod and the collecting groove are arranged, so that a thickening agent and extruded base oil at the joint of the inner gear ring and the planet wheel can be collected, the clean environment in the shell is kept, the normal operation and heat dissipation of the planetary reducer body are guaranteed, and the base oil can be sucked back by the thickening agent again, so that the waste is reduced.

The scraping rod and the fixed rod are arranged, the rotation of the planet gear can drive the rotating ring to rotate in the mounting groove through the fixed rod, then the rotating ring can drive the scraping rod to scrape off a thickening agent extruded from the joint of the planet gear and the inner gear ring, and meanwhile extruded base oil can flow into the collecting tank so as to keep the environment in the casing clean and avoid the thickening agent from blocking mechanical transmission and influencing the normal operation and heat dissipation of the planet speed reducer body;

the top end of the clamping column is always attached to the outer side wall of the rotating ring, when the clamping column is aligned with the clamping groove, the fifth spring is restored to push the clamping column to be inserted into the clamping groove, the rotating ring continues to rotate, the sliding block can be driven by the clamping column to slide in the fixed plate, meanwhile, the sliding block pulls the connecting rope, the connecting rope pulls the sliding plate to slide in the sliding groove, the pressing structure is moved away from the right upper side of the collecting groove, and a space is provided for the thickening agent to enter the collecting groove;

the scraping rod is provided with a collecting groove and a scraping block, the rotating ring continues to rotate, the top end of the scraping block is in contact with the scraping rod, the scraping rod presses the scraping block, the scraping block is retracted into the mounting block, and the scraping block can scrape the thickening agent on the scraping rod;

the lubricating grease collecting device is provided with a scraper blade and a pressure plate, the clamping column is separated from the inside of the clamping groove along with the continuous rotation of the rotating ring, the third spring is restored to drive the sliding block to reset, the second spring is restored to drive the sliding plate to reset, the pressure plate returns to the right upper side of the collecting groove again, then the micro motor is started to drive the lead screw to rotate, the lead screw is meshed with the lifting plate and can drive the scraper blade to descend, the thickening agent at the top end of the scraping block can be scraped downwards by the scraper blade, the micro cylinder is started to drive the pressure plate to descend, the thickening agent on the scraping block can be scraped into the collecting groove, so that base oil in the collecting groove can be sucked into the thickening agent again to keep the normal effect of the lubricating grease and reduce waste, meanwhile, the pressure plate can press the lubricating grease in the collecting groove downwards, so that the lubricating grease can be sprayed to the joint of the planet wheel and the inner gear ring gear through a guide pipe to reduce the friction and the abrasion between mechanical transmission parts, the transmission efficiency of the planetary reducer body is improved to play and inhale the effect such as shake, cooling, heat dissipation, rust-resistant and fall the noise, and the clamp plate can flatten the top surface of the inside lubricating grease of collecting vat, in order to avoid appearing the pit, makes the base oil in the lubricating grease extruded by natural gravity and out of the way, and influences the quality of lubricating grease.

Drawings

FIG. 1 is a schematic structural front view of a planetary reducer body according to the present invention;

FIG. 2 is a side view of the structure of the housing of the present invention;

FIG. 3 is a schematic structural side view of a fixing rod according to the present invention;

FIG. 4 is a schematic side view of the construction of the mounting block of the present invention;

FIG. 5 is a schematic side view of the fixing plate according to the present invention;

FIG. 6 is an exploded view of the linkage structure of the present invention;

FIG. 7 is a schematic side sectional view of a collection tank according to the present invention;

fig. 8 is an exploded view of the push down structure of the present invention.

In the figure: 1. a planetary reducer body; 11. a housing; 12. a planet wheel; 13. an inner gear ring; 14. mounting grooves; 2. cleaning the structure; 21. a rotating ring; 22. breaking the groove; 23. a scraping rod; 24. a card slot; 25. a fixing rod; 3. a collection structure; 31. mounting a block; 32. a sliding groove; 33. collecting tank; 34. a conduit; 35. scraping the block; 36. a first spring; 4. a press-down structure; 41. a fixed block; 42. a slide plate; 43. a second spring; 44. a micro cylinder; 45. pressing a plate; 46. an air outlet; 47. a screw rod; 48. a lifting plate; 49. a squeegee; 410. a fourth spring; 5. a linkage structure; 51. a fixing plate; 52. a slider; 53. clamping the column; 54. a fifth spring; 55. connecting ropes; 56. a pulley.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, an embodiment of the present invention:

the micro motor and the micro motor used in the present application are directly available in the market, and the principle and the connection manner thereof are the prior art well known to those skilled in the art, and thus are not described herein again.

A stabilize heat dissipation and crashproof planetary reducer includes:

the planetary reducer comprises a planetary reducer body 1, wherein the planetary reducer body 1 comprises a casing 11, a planetary wheel 12 is installed inside the casing 11, an inner gear ring 13 is fixedly installed on the inner wall of the casing 11, and installation grooves 14 are formed in two sides of the inner gear ring 13;

the cleaning structure 2 comprises a rotating ring 21, the rotating ring 21 is slidably mounted inside the mounting groove 14, a broken groove 22 is formed in the rotating ring 21, a scraping rod 23 is fixedly mounted on the inner wall of the rotating ring 21, a clamping groove 24 is formed in the outer wall of the rotating ring 21, and a fixing rod 25 is fixedly connected between the rotating ring 21 and the planet wheel 12;

collect structure 3, collect structure 3 including installation piece 31, installation piece 31 fixed mounting is on casing 11's inner wall, sliding tray 32 has been seted up to installation piece 31's top surface, collecting vat 33 has been seted up to sliding tray 32's bottom surface, installation piece 31's bottom surface fixedly connected with pipe 34, installation piece 31's top surface movable mounting scrapes piece 35, scrape the first spring of bottom surface fixedly connected with 36 of piece 35, collecting vat 33 can be collected ring gear 13 and planet wheel 12 combination department densifier and extruded base oil, in order to keep the inside environment of casing 11 clean and tidy, guarantee planetary reducer body 1's normal operating and heat dissipation, and the densifier can be inhaled the base oil back again, in order to reduce extravagantly.

Further, the pressing structure 4 includes a fixing block 41, the fixing block 41 is fixedly installed on the top surface of the installation block 31, a sliding plate 42 is slidably installed on the inner side of the fixing block 41, a second spring 43 is fixedly connected to the side wall of the sliding plate 42, a micro cylinder 44 is fixedly installed on the top surface of the sliding plate 42, a pressing plate 45 is fixedly connected to the bottom end of the micro cylinder 44, an air outlet 46 is formed in the top surface of the pressing plate 45, a lead screw 47 is installed on one side of the micro cylinder 44, a lifting plate 48 is slidably installed on the side wall of the pressing plate 45, a scraping plate 49 is slidably installed on the side wall of the lifting plate 48, a fourth spring 410 is fixedly connected to the side wall of the scraping plate 49, and the densifier on the scraping block 35 can be scraped into the collecting tank 33 through the pressing structure 4, and compresses the grease inside the collection trough 33 to replenish the grease inside the casing 11, while the scraping block 35 flattens the top surface of the grease to prevent the base oil from being squeezed out by the natural gravity.

Further, linkage 5 includes fixed plate 51, fixed plate 51 fixed mounting is in the inside of casing 11, fixed plate 51's top surface slidable mounting has slider 52, slider 52's both ends movable mounting has card post 53, the bottom fixedly connected with fifth spring 54 of card post 53, fixedly connected with connects rope 55 on slider 52's the both sides wall, the middle part of connecting rope 55 twines has pulley 56, through linkage 5, can be when rotatory circle 21 is rotatory, it removes on collecting structure 3 to drive down to push down structure 4, make collecting vat 33 top expose, it falls into inside collecting vat 33 to be convenient for scrape the densifier on the piece 35.

Furthermore, the rotating rings 21 are two groups in total, the scraping rods 23 are installed in an inclined mode, the side walls of the scraping rods 23 are attached to the side walls of the inner gear ring 13, the installation block 31 is located on the right lower side of the rotating rings 21, the top ends of the scraping blocks 35 are inserted into the inner side of the rotating rings 21 through the broken grooves 22, the rotating rings 21 can drive the scraping rods 23 to scrape off a thickening agent at the joint of the planet gears 12 and the inner gear ring 13, the scraping rods 23 press the scraping blocks 35 downwards, the scraping blocks 35 are retracted into the installation block 31, and the top ends of the scraping blocks 35 are attached to the outer wall of the rotating rings 21.

Furthermore, the tail end of the conduit 34 is located inside the collecting groove 33, the top end of the conduit 34 is located on one side of the inner gear ring 13, one end of the first spring 36 is fixedly connected with the inner wall of the mounting block 31, the lubricating grease inside the collecting groove 33 can be guided into the casing 11 through the scraping block 35 to supplement the lubricating grease inside the casing 11, and the first spring 36 provides power for resetting of the scraping block 35.

Further, the sliding plate 42 is slidably mounted inside the sliding groove 32, the end of the second spring 43 is fixedly connected with the inner wall of the fixing block 41, the output end of the micro cylinder 44 is located on the bottom surface of the sliding plate 42, the air-permeable waterproof membrane is fixedly mounted inside the air outlet hole 46, the sliding plate 42 can slide inside the sliding groove 32, and air inside the collecting groove 33 can be discharged through the air outlet hole 46.

Further, the end portion of the screw rod 47 is fixedly connected with a micro motor, the screw rod 47 is in threaded connection with the lifting plate 48, the side wall of the scraping plate 49 is attached to the side wall of the scraping block 35, the end portion of the fourth spring 410 is fixedly connected with the inner wall of the lifting plate 48, the micro motor provides power for rotation of the screw rod 47, and the scraping plate 49 can downwards scrape the thickening agent at the end portion of the scraping block 35 to prevent the side wall of the pressing plate 45 from being adhered with the thickening agent.

Furthermore, the fixing plate 51 is located on the lower side of the inner gear ring 13, a third spring is connected between the sliding block 52 and the fixing plate 51, the end of the fifth spring 54 is fixedly connected with the sliding block 52, the top end of the clamping column 53 is inserted into the clamping slot 24, the pulley 56 is rotatably installed inside the housing 11, the end of the connecting rope 55 is fixedly connected with the side wall of the sliding plate 42, the third spring provides power for resetting of the sliding block 52, and the sliding block 52 and the connecting rope 55 are driven to move when the rotating ring 21 rotates through the clamping column 53, so as to provide power for the movement of the pressing structure 4 on the collecting structure 3.

The working principle is as follows: during the use, the rotatory accessible dead lever 25 of planet wheel 12 drives rotatory circle 21 and slides, rotatory circle 21 drives to scrape the pole 23 and scrapes the densifier that planet wheel 12 and ring gear 13 junction extruded after that, and the top of card post 53 is laminated with the lateral wall of rotatory circle 21 all the time, when card post 53 aligns with draw-in groove 24, fifth spring 54 recovers, promote inside card post 53 injects draw-in groove 24, rotatory circle 21 continues to rotate, drive slider 52 through card post 53 and slide in fixed plate 51 inside, slider 52 pulling connection rope 55 simultaneously, connect rope 55 pulling slide 42 and slide in sliding tray 32 inside, make down pressure structure 4 remove from collecting vat 33 directly upside, get into the inside space that provides of collecting vat 33 for the densifier, and the base oil that extrudes can flow into the inside of collecting vat 33.

Then the rotating ring 21 continues to rotate, the top end of the scraping block 35 is in contact with the scraping rod 23, the scraping rod 23 presses down the scraping block 35, the scraping block 35 retracts into the mounting block 31, the scraping block 35 can scrape the thickening agent on the scraping rod 23, the clamping column 53 is separated from the inside of the clamping groove 24 along with the continuous rotation of the rotating ring 21, the third spring is restored, the sliding block 52 and the sliding plate 42 are driven to reset, the pressing plate 45 returns to the right upper side of the collecting groove 33 again, then the micro motor is started, the lead screw 47 is driven to rotate, the lead screw 47 is meshed with the lifting plate 48, the scraping plate 49 is driven to descend, and the thickening agent on the top end of the scraping block 35 can be scraped downwards by the scraping plate 49.

Then the micro cylinder 44 is started, the micro cylinder 44 drives the pressing plate 45 to descend, the thickening agent on the scraping block 35 can be scraped into the collecting tank 33, so that the base oil in the collecting tank 33 can be sucked into the thickening agent again, the normal effect of lubricating grease can be kept, waste is reduced, meanwhile, the pressing plate 45 can press down the lubricating grease in the collecting tank 33, the lubricating grease can be sprayed to the joint of the planet wheel 12 and the inner gear ring 13 again through the guide pipe 34, friction and abrasion between mechanical transmission parts are reduced, the transmission efficiency of the planetary reducer body 1 is improved, the effects of vibration absorption, cooling, heat dissipation, rust prevention, noise reduction and the like are achieved, the pressing plate 45 can flatten the top surface of the lubricating grease in the collecting tank 33, pits are avoided, the base oil in the lubricating grease is squeezed out by natural gravity, and the quality of the lubricating grease is affected.

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 attributes 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. The utility model provides a stabilize planetary reducer of heat dissipation and anticollision which characterized in that includes:

the planetary reducer comprises a planetary reducer body (1), wherein the planetary reducer body (1) comprises a machine shell (11), a planetary wheel (12) is installed inside the machine shell (11), an inner gear ring (13) is fixedly installed on the inner wall of the machine shell (11), and installation grooves (14) are formed in two sides of the inner gear ring (13);

the cleaning structure (2) comprises a rotating ring (21), the rotating ring (21) is slidably mounted inside the mounting groove (14), a broken groove (22) is formed in the rotating ring (21), a scraping rod (23) is fixedly mounted on the inner wall of the rotating ring (21), a clamping groove (24) is formed in the outer wall of the rotating ring (21), and a fixing rod (25) is fixedly connected between the rotating ring (21) and the planet wheel (12);

collect structure (3), collect structure (3) including installation piece (31), installation piece (31) fixed mounting is on the inner wall of casing (11), sliding tray (32) have been seted up to the top surface of installation piece (31), collecting vat (33) have been seted up to the bottom surface of sliding tray (32), the bottom surface fixedly connected with pipe (34) of installation piece (31), the top surface movable mounting of installation piece (31) has scrapes piece (35), scrape the first spring (36) of bottom surface fixedly connected with of piece (35).

2. The planetary reducer with stable heat dissipation and collision avoidance according to claim 1, wherein: push down structure (4), push down structure (4) including fixed block (41), fixed block (41) fixed mounting is at the top surface of installation piece (31), the inboard slidable mounting of fixed block (41) has slide (42), fixedly connected with second spring (43) on the lateral wall of slide (42), the top surface fixed mounting of slide (42) has miniature cylinder (44), the bottom fixedly connected with clamp plate (45) of miniature cylinder (44), venthole (46) have been seted up to the top surface of clamp plate (45), lead screw (47) are installed to one side of miniature cylinder (44), slidable mounting has lifter plate (48) on the lateral wall of clamp plate (45), slidable mounting has scraper blade (49) on the lateral wall of lifter plate (48), fixedly connected with fourth spring (410) on the lateral wall of scraper blade (49).

3. The planetary reducer with stable heat dissipation and collision avoidance according to claim 1, wherein: linkage structure (5), linkage structure (5) are including fixed plate (51), fixed plate (51) fixed mounting is in the inside of casing (11), the top surface slidable mounting of fixed plate (51) has slider (52), the both ends movable mounting of slider (52) has card post (53), the bottom fixedly connected with fifth spring (54) of card post (53), fixedly connected with connects rope (55) on the both sides wall of slider (52), the middle part of connecting rope (55) is twined and is had pulley (56).

4. The planetary reducer with stable heat dissipation and collision avoidance according to claim 1, wherein: rotatory circle (21) are total two sets of, scrape pole (23) and be the tilting installation, scrape the lateral wall laminating of the lateral wall of pole (23) and ring gear (13), installation piece (31) are located rotatory circle (21) under, the top of scraping piece (35) is via disconnected groove (22) the inboard of inserting rotatory circle (21).

5. The planetary reducer with stable heat dissipation and collision avoidance according to claim 1, wherein: the tail end of the guide pipe (34) is located inside the collecting groove (33), the top end of the guide pipe (34) is located on one side of the inner gear ring (13), and one end of the first spring (36) is fixedly connected with the inner wall of the mounting block (31).

6. The planetary reducer with stable heat dissipation and collision avoidance according to claim 2, wherein: slide (42) slidable mounting is in the inside of sliding tray (32), the tip of second spring (43) and the inner wall fixed connection of fixed block (41), the output of miniature cylinder (44) is located the bottom surface of slide (42), the inside fixed mounting of venthole (46) has ventilative waterproof membrane.

7. The planetary reducer with stable heat dissipation and collision avoidance according to claim 2, wherein: the utility model discloses a scraper blade, including lead screw (47), lead screw (47) and lifter plate (48), the tip fixedly connected with micromotor of lead screw (47), lead screw (47) and lifter plate (48) threaded connection, the lateral wall of scraper blade (49) with scrape the lateral wall laminating of piece (35), the tip of fourth spring (410) and the inner wall fixed connection of lifter plate (48).

8. The stable heat dissipation and anti-collision planetary reducer as claimed in claim 3, wherein: the fixed plate (51) is located on the lower side of the inner gear ring (13), a third spring is connected between the sliding block (52) and the fixed plate (51), the end of the fifth spring (54) is fixedly connected with the sliding block (52), the top end of the clamping column (53) is inserted into the clamping groove (24), the pulley (56) is rotatably installed in the shell (11), and the end of the connecting rope (55) is fixedly connected with the side wall of the sliding plate (42).