CN114097754B

CN114097754B - Equipment for killing insects in tree

Info

Publication number: CN114097754B
Application number: CN202111413991.2A
Authority: CN
Inventors: 魏旗安
Original assignee: Yunnan Lvyouyou Garden Engineering Co ltd
Current assignee: Yunnan Lvyouyou Garden Engineering Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2023-01-06
Anticipated expiration: 2041-11-25
Also published as: CN114097754A

Abstract

The invention relates to the field of deinsectization, in particular to tree interior deinsectization equipment which comprises a shell, wherein two clamping grooves are formed in one shell relative to the other shell, clamping blocks are fixedly connected to the corresponding clamping grooves in the shell, adjustable buckles are arranged between the clamping blocks and the clamping grooves, a rotating groove is formed in the opposite surface of the upper ends of the two shells, a motor fixedly connected into the shell is arranged outside the rotating groove on one side, a driving shaft is rotatably connected into the rotating groove, a driven shaft is rotatably connected into the rotating groove on the other side, the driving shaft is fixedly connected with the output end of the motor, a water pipe is arranged in the shell, the bottom of the shell is connected with a fixing block for fixing the water pipe through the water pipe, the water pipe is respectively and fixedly connected with a side water outlet and an upper water outlet on the upper end face of the shell, pesticide is sprayed to the surface of a tree when the equipment automatically climbs the tree, meanwhile, the gas outlet auxiliary pesticide liquid is driven by the water flow to further deeply sprayed onto the tree leaves, the tree cannot enter the tree because of the blocking of the tree leaves, meanwhile, the equipment can be remotely controlled, and workers are prevented from being bitten by insects.

Description

Equipment for killing insects in tree

Technical Field

The invention relates to the field of deinsectization, in particular to an in-tree deinsectization device.

Background

More pests can corrode trees and hinder the growth of trees in garden planting, workers are usually required to continuously deinsectization work, at present, people mainly manually spray insecticide on garden trees or use a wooden barrel filled with insecticide and placed beside the trees to kill insects, garden plant leaf eating pests are various in types and mainly comprise piercing moth, ruled moth, dead leaf moth, boat moth, spontanus virens, noctuid moth, stem borer moth, cabbage caterpillar, hymenoptera leaf peaks, coleoptera leaf beetles, orthoptera locust, leaf eating animal slugs, snails, pillbugs and the like, wherein the moths account for most, and the following three problems exist in the existing deinsectization method;

1. part of insects are toxic and are easy to be bitten by insects in the insect killing process of workers, so that the health and the safety of human bodies are harmed;

2. when the insecticide is sprayed, workers can only spray the liquid medicine outside the tree, and partial branches and leaves inside the tree are blocked by leaves outside the tree and cannot deeply penetrate into the tree to kill insects; 3. the prior art lacks a way to kill pests that are hidden on the trunk.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides an in-tree insect killing device which can spray pesticide on the surface of a tree during automatic tree climbing, drive an air outlet pipe to give out air through water flow to assist pesticide liquid to be further sprayed deeply onto leaves, cannot penetrate into the tree due to blocking of the leaves, can be remotely controlled, and avoids workers from being bitten by insects.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides an in-tree deinsectization equipment, includes the casing, one relative another on the casing sets up the draw-in groove that two symmetries set up, correspond on the casing draw-in groove fixed connection fixture block, the fixture block with be equipped with adjustable buckle between the draw-in groove, two casing upper end opposite face has seted up and has rotated the groove, one side it is equipped with fixed connection to rotate the groove outward motor in the casing, rotate inslot rotation connection driving shaft, opposite side it connects driven shaft to rotate inslot rotation, the driving shaft with motor output end fixed connection, be equipped with the water pipe of vertical setting in the casing, the water pipe is in the casing bottom has connect the fixed block of fixed water pipe, the water pipe is in casing up end and side fixed connection side outlet and last delivery port respectively.

Preferably, the opposite surfaces of the lower ends of the two shells are provided with fixedly connected pressing seats, a pressing groove is formed in each pressing seat, a pressing block is connected in the pressing groove in a sliding manner, a pressing spring is arranged between the pressing block and the pressing groove for connection, one end of the pressing block in the pressing groove is fixedly connected with a sliding water pipe which penetrates through the pressing seat, the sliding water pipe slides in the pressing groove, and the other end of the sliding water pipe is connected in the water pipe in a sliding manner.

Preferably, a liquid injection passage is formed in the pressing block, the liquid injection passage is communicated with the sliding water pipe, a plurality of groups of roller grooves are formed in the surface, facing the other pressing block, of the pressing block, a roller shaft in rotary connection is arranged in each roller groove, rollers are fixedly connected to the roller shafts, a ratchet wheel is arranged at one end of each roller shaft to enable the rollers not to rotate reversely, a working cavity is formed in the other end of each roller shaft of the pressing block, the roller shafts are fixedly connected with first bevel gears in the working cavities, the working cavities are rotatably connected with the rotating water pipe, second bevel gears are fixedly connected to the rotating water pipe, and the second bevel gears are in meshing transmission with the first bevel gears.

Preferably, the liquid injection channel is provided with a plurality of liquid separation channels corresponding to the rollers, the liquid separation channels are communicated with the rotating water pipe, the rotating water pipe is provided with a limiting block in sliding connection with the liquid separation channels, a partition board is fixedly connected in the rotating water pipe, the partition board is provided with two symmetrical water through holes for communicating the liquid separation channels with the rotating water pipe, the partition board is also provided with a water retaining groove, the water retaining groove is in sliding connection with a water retaining slide plate, and a water retaining spring for enabling the water retaining slide plate to plug the water through holes is arranged between the water retaining slide plate and the water retaining groove.

Preferably, the water pipe is close to the side water outlet and the upper water outlet, an impeller shaft is rotatably connected with the water pipe, two ends of the impeller shaft are located outside the water pipe, third bevel gears fixedly connected with the two ends of the impeller shaft are symmetrically arranged at two ends of the impeller shaft, air outlet pipes symmetrically arranged around the side water outlet are arranged, an atomizer is arranged in the side water outlet, an air wheel shaft rotatably connected with the air outlet pipe is arranged in the air outlet pipe, the air wheel shaft is fixedly connected with an outward-exhausting air wheel, the other end of the air wheel shaft is fixedly connected with a fourth bevel gear, the fourth bevel gear is in meshing transmission with the third bevel gear, and an air inlet pipe for air inlet is arranged at the edge of the air outlet pipe.

Preferably, the driven shaft and the driving shaft are connected with a sleeve in a rotating mode, the driven shaft and the driving shaft are fixedly connected with a circular array in the sleeve to form a group, a plurality of groups of abutting rods are arranged in a linear array, the sleeve is provided with ejector rods which are fixedly connected with the abutting rods in a corresponding mode, the ejector rods and the abutting rods abut against each other when rotating, the sleeve is provided with a plurality of groups of ejector block grooves corresponding to the ejector rods, ejector blocks which are connected in a sliding mode are arranged in the ejector block grooves, the ejector blocks are connected with the ejector block grooves through retraction springs which are symmetrically arranged, the ejector blocks are fixedly connected with the ejector rods, and flexible rubber cloth wraps the sleeve.

Preferably, one surface of the shell on the other side, opposite to the compression block, of the sleeve is an inward-concave arc surface.

Has the advantages that: the device is in an inclined state through the arrangement of the driving shaft and the driven shaft, and meanwhile, the pressing blocks on the two sides are subjected to different pressures to generate larger friction with trees, so that the device can conveniently ascend and descend;

the ascending and descending of the remote control equipment prevent workers from being bitten and injured during insect killing, and the safety of the workers is protected;

the water pipe can be rotated to coat the liquid medicine on the trunk in the ascending process of the device, and the impeller arranged in the water pipe drives the wind wheel to make the sprayed liquid medicine be assisted by wind power to blow open the leaves for further deep spraying.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic diagram of a structural implementation of the present invention;

FIG. 3 isbase:Sub>A schematic view of FIG. 2 taken along line A-A;

FIG. 4 is an enlarged view of the point B in FIG. 2;

FIG. 5 is an enlarged view of the point C in FIG. 2;

FIG. 6 is a schematic view of FIG. 2 taken along the direction D-D;

FIG. 7 is an enlarged view of E in FIG. 3;

fig. 8 is an enlarged view of F in fig. 7.

In the figure, a shell 10, a side water outlet 11, an upper water outlet 12, a water pipe 13, a fixture block 14, a clamping groove 15, a driven shaft 16, a driving shaft 17, a motor 18, a resisting rod 19, a fixing block 20, a rotating groove 21, a sliding water pipe 22, a pressing block 23, a pressing seat 24, a pressing spring 25, a pressing groove 26, a roller 27, a liquid injection channel 28, a liquid separation channel 29, a roller shaft 30, a roller groove 31, a first helical gear 32, a second helical gear 33, a rotating water pipe 34, a water through hole 35, a partition plate 36, a water blocking sliding plate 37, a water blocking groove 38, a water blocking spring 39, a limiting block 40, a push rod 41, a top block 42, a retraction spring 43, a rubber cloth 44, a sleeve 45, a top block groove 46, an impeller 47, an impeller shaft 48, a third helical gear 49, a fourth helical gear 50, an air wheel shaft 51, an air wheel 52, an air inlet pipe 53, an air outlet pipe 54, an atomizer 55 and a working cavity 56.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

In the description of the present invention, it should be noted that the terms "inside", "below", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally place when used, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

With reference to fig. 1-8, an in-tree disinsection device comprises a shell 10, two symmetrically arranged clamping grooves 15 are formed in one shell 10 relative to the other shell 10, clamping blocks 14 are fixedly connected to the corresponding clamping grooves 15 on the shell 10, adjustable buckles are arranged between the clamping blocks 14 and the clamping grooves 15, rotating grooves 21 are formed in opposite surfaces of the upper ends of the two shells 10, a motor 18 fixedly connected into the shell 10 is arranged outside the rotating groove 21 on one side, a driving shaft 17 is rotatably connected into the rotating groove 21, a driven shaft 16 is rotatably connected into the rotating groove 21 on the other side, the driving shaft 17 is fixedly connected with the output end of the motor 18, a vertically arranged water pipe 13 is arranged in the shell 10, the water pipe 13 is connected with a fixing block 20 for fixing the water pipe at the bottom of the shell 10, and the water pipe 13 is respectively and fixedly connected with a side water outlet 11 and an upper water outlet 12 on the upper end surface and the side surface of the shell 10.

Further, the opposite surfaces of the lower ends of the two shells 10 are provided with a pressing seat 24 fixedly connected, a pressing groove 26 is formed in the pressing seat 24, a pressing block 23 is connected in the pressing groove 26 in a sliding mode, a pressing spring 25 is arranged between the pressing block 23 and the pressing groove 26 for connection, one end of the pressing block 23 in the pressing groove 26 is fixedly connected with a sliding water pipe 22 penetrating through the pressing seat 24, the sliding water pipe 22 slides in the pressing groove 26, and the other end of the sliding water pipe 22 is connected in the water pipe 13 in a sliding mode.

Furthermore, a liquid injection channel 28 is formed in the pressing block 23, the liquid injection channel 28 is communicated with the sliding water pipe 22, a plurality of sets of roller grooves 31 are formed in the surface of the pressing block 23 facing the other pressing block 23, roller shafts 30 which are connected in a rotating mode are arranged in the roller grooves 31, rollers 27 are fixedly connected to the roller shafts 30, one ends of the roller shafts 30 are provided with ratchet wheels to prevent the rollers 27 from rotating reversely, a working cavity 56 is formed in the other end of the pressing block 23, the roller shafts 30 are fixedly connected with first bevel gears 32 in the working cavity 56, the working cavity 56 is connected with the rotating water pipe 34 in a rotating mode, second bevel gears 33 are fixedly connected to the rotating water pipe 34, and the second bevel gears 33 are in meshing transmission with the first bevel gears 32.

Furthermore, a plurality of liquid dividing channels 29 corresponding to the rollers 27 are formed in the liquid injection channel 28, the liquid dividing channels 29 are communicated with the rotating water pipe 34, a limiting block 40 connected with the liquid dividing channels 29 in a sliding mode is arranged on the rotating water pipe 34, a partition plate 36 is fixedly connected in the rotating water pipe 34, two symmetrical water through holes 35 which are communicated with the liquid dividing channels 29 and the rotating water pipe 34 are formed in the partition plate 36, a water retaining groove 38 is further formed in the partition plate 36, a water retaining slide plate 37 is connected in the water retaining groove 38 in a sliding mode, and a water retaining spring 39 enabling the water retaining slide plate 37 to block the water through holes 35 is arranged between the water retaining slide plate 37 and the water retaining groove 38.

Further, an impeller shaft 48 which is rotatably connected is arranged on the water pipe 13 at a position close to the side water outlet 11 and the upper water outlet 12, two ends of the impeller shaft 48 are positioned outside the water pipe 13, third helical gears 49 which are fixedly connected are symmetrically arranged at two ends of the impeller shaft 48, air outlet pipes 54 which are symmetrically arranged are arranged around the side water outlet 11, an atomizer 55 is arranged in the side water outlet 11, an air wheel shaft 51 which is rotatably connected is arranged in the air outlet pipe 54, an air wheel 52 which exhausts air outwards is fixedly connected to the air wheel shaft 51, a fourth helical gear 50 is fixedly connected to the other end of the air wheel shaft 51, the fourth helical gear 50 is in meshing transmission with the third helical gear 49, and an air inlet pipe 53 which admits air is arranged at the edge of the air outlet pipe 54.

Further, driven shaft 16 and driving shaft 17 go up rotation connecting sleeve 45, driven shaft 16 and driving shaft 17 are a set of at sleeve 45 internal fixed connection circular array, the multiunit of linear array setting supports pole 19, it is equipped with fixed connection's ejector pin 41 to correspond to support pole 19 on the sleeve 45, ejector pin 41 and support pole 19 butt when rotating, it has multiunit kicking block groove 46 to correspond ejector pin 41 on the sleeve 45, be equipped with sliding connection's kicking block 42 in the kicking block groove 46, be connected through the retraction spring 43 that the symmetry set up between kicking block 42 and the kicking block groove 46, kicking block 42 and ejector pin 41 fixed connection, sleeve 45 wraps up outward has flexible rubber cloth 44.

Further, one surface of the housing 10 on the other side of the sleeve 45 opposite to the pressing block 23 is an inwardly concave arc surface.

The working principle is as follows: the worker connects the prepared pesticide liquid with the water pipe 13 through the water pipe, the pesticide liquid is fixed through the fixing block 20, the two shells 10 are clamped on the trunk through the clamping block 14 and the clamping groove 15, at the moment, the pressing block 23 is pressed on the trunk and enters the pressing groove 26 under pressure, the pressing spring 25 is in a compressed state, meanwhile, the pressing spring 25 gives a counterforce to the pressing block 23 to enable the pressing block 23 to be in closer contact with the trunk, the motor 18 is further opened remotely, the motor 18 drives the driving shaft 17 fixedly connected with the trunk to rotate, the abutting rod 19 fixedly connected with the driving shaft 17 rotates and abuts against the ejecting rod 41 to drive the ejecting rod 41 to rotate, as the ejecting rod 41 is fixedly connected with the ejecting block 42, the ejecting block 42 is internally provided with the retraction spring 43 in the ejecting block groove 46 to be connected, the ejecting block 42 overcomes the tensile force of the retraction spring 43 under the rotating force of the abutting rod 19, the rubber cloth 44 is wrapped outside the sleeve 45, the sleeve 45 is jacked on the trunk by the ejecting block 42, as the ejecting block 42 rotates, the rubber cloth 44 is driven to roll upwards on the trunk, and only one side of the shell 10 moves upwards, and only one side of the shell 10 is driven by the pressing shaft 16, and is pressed on the two sides of the shell 23 in a more tightly pressed by the driving shaft 16, and is further, and is pressed in the shell 16, which is higher by the shell in the shell 16;

meanwhile, in the climbing process, water flow enters the sliding water pipe 22 through the water pipe 13, the sliding water pipe 22 can slide in the water pipe 13 under the extrusion, the water flow then flows into the liquid dividing channel 29 through the liquid injection channel 28 respectively, because the tail end of the liquid dividing channel 29 is rotatably connected with the rotating water pipe 34, in the climbing process, the roller 27 rotatably connected to the pressing block 23 rotates while contacting with the trunk, so that the roller shaft 30 drives the first helical gear 32 to rotate, the first helical gear 32 drives the engaged second helical gear 33 to rotate, the second helical gear 33 drives the fixedly connected rotating water pipe 34 to rotate, when the rotating water pipe 34 rotates, the water-retaining slide plate 37 is influenced by centrifugal force to move towards the water-retaining groove 38 by overcoming the elastic force of the water-retaining spring 39, so that the water-retaining hole 35 is not blocked, and the water flow flows out from one side of the roller 27 after flowing to the rotating water pipe 34 from the trunk 29 and is coated on the liquid dividing channel;

when water flow is discharged from the side water outlet 11 and the upper water outlet 12, the impeller 47 fixedly connected to the impeller shaft 48 is driven to rotate, the impeller shaft 48 simultaneously rotates to drive the third bevel gear 49 to rotate, the third bevel gear 49 drives the engaged fourth bevel gear 50 to rotate, the fourth bevel gear 50 drives the fixedly connected wind wheel shaft 51 to rotate, the wind wheel shaft 51 drives the fixedly connected wind wheel 52 to rotate, the wind wheel 52 rotates to suck air through the air inlet pipe 53 and then spray the air through the air outlet pipe 54, the liquid medicine atomized by the atomizer 55 in the auxiliary side water outlet 11 is sprayed farther, and meanwhile, leaves can be blown away, so that more liquid medicine can cover the trees;

during the whereabouts, control motor 18 reversal, because gyro wheel 27 can't reverse, so sliding friction between gyro wheel 27 and the trunk, produce great resistance, driving shaft 17 reversal simultaneously, it is ejecting not to make ejector pin 41 drive kicking block 42 ejecting to make ejector pin 19 when supporting rod 19 and ejector pin 41 butt, rubber blanket 44 can not be hugged closely on the trunk, simultaneously during the whereabouts because driving shaft 17 initiative descends, driving shaft 17 is higher lower than driven shaft 16, the tighter of compact heap 23 below driving shaft 17 pastes on the trunk, gyro wheel 27 does not rotate simultaneously, avoid falling the too fast equipment that makes of speed to damage.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The tree interior pest killing device comprises a shell (10), and is characterized in that two symmetrically-arranged clamping grooves (15) are formed in one shell (10) relative to the other shell (10), clamping blocks (14) are fixedly connected to the shell (10) corresponding to the clamping grooves (15), adjustable buckles are arranged between the clamping blocks (14) and the clamping grooves (15), rotating grooves (21) are formed in opposite surfaces of the upper ends of the two shells (10), a motor (18) fixedly connected into the shell (10) is arranged outside the rotating grooves (21) on one side, a driving shaft (17) is rotatably connected to the rotating grooves (21) on the other side, a driven shaft (16) is rotatably connected to the rotating grooves (21) on the other side, the driving shaft (17) is fixedly connected with an output end of the motor (18), a vertically-arranged water pipe (13) is arranged in the shell (10), a fixing block (20) for fixing the water pipe is connected to the bottom of the shell (10), and the water pipe (13) is fixedly connected to a water outlet (11) on the side and an upper water outlet (12) on the upper end face and the side of the shell (10) respectively;

the opposite surfaces of the lower ends of the two shells (10) are provided with fixedly connected pressing seats (24), pressing grooves (26) are formed in the pressing seats (24), pressing blocks (23) are connected in the pressing grooves (26) in a sliding mode, pressing springs (25) are arranged between the pressing blocks (23) and the pressing grooves (26) for connection, one ends of the pressing blocks (23) in the pressing grooves (26) are fixedly connected with sliding water pipes (22) penetrating through the pressing seats (24), the sliding water pipes (22) slide in the pressing grooves (26), and the other ends of the sliding water pipes (22) are connected in the water pipes (13) in a sliding mode;

the novel hydraulic oil cylinder is characterized in that a liquid injection channel (28) is formed in the pressing block (23), the liquid injection channel (28) is communicated with the sliding water pipe (22), a plurality of groups of roller grooves (31) are formed in the surface, facing the other pressing block (23), of the pressing block (23), roller shafts (30) which are connected in a rotating mode are arranged in the roller grooves (31), rollers (27) are fixedly connected to the roller shafts (30), a ratchet wheel is arranged at one end of each roller shaft (30) to enable the rollers (27) to be incapable of reversing, a working cavity (56) is formed in the other end of each roller shaft (30) of the pressing block (23), the roller shafts (30) are fixedly connected with first bevel gears (32) in the working cavities (56), the rotating water pipe (34) is connected in the working cavity (56) in a rotating mode, a second bevel gear (33) is fixedly connected to the rotating water pipe (34), and the second bevel gears (33) are in meshing transmission with the first bevel gears (32).

2. An in-tree disinfestation apparatus as claimed in claim 1, wherein: the water injection device is characterized in that a plurality of liquid dividing channels (29) corresponding to the rollers (27) are formed in the liquid injection channel (28), the liquid dividing channels (29) are communicated with the rotating water pipe (34), a limiting block (40) in sliding connection with the liquid dividing channels (29) is arranged on the rotating water pipe (34), a partition plate (36) is fixedly connected in the rotating water pipe (34), two symmetrical connecting channels are formed in the partition plate (36), the liquid dividing channels (29) are communicated with the water through holes (35) of the rotating water pipe (34), a water retaining groove (38) is further formed in the partition plate (36), a water retaining slide plate (37) is connected in the water retaining groove (38) in a sliding mode, and a water retaining spring (39) for enabling the water retaining slide plate (37) to block the water through holes (35) is arranged between the water retaining slide plate (37) and the water retaining groove (38).

3. An apparatus for disinfestation within a tree as claimed in claim 2, wherein: the water pipe (13) is close to the side water outlet (11) and the upper water outlet (12) and is provided with an impeller shaft (48) in rotating connection, two ends of the impeller shaft (48) are located outside the water pipe (13), two ends of the impeller shaft (48) are symmetrically provided with third bevel gears (49) in fixed connection, air outlet pipes (54) are symmetrically arranged around the side water outlet (11), an atomizer (55) is arranged in the side water outlet (11), an air wheel shaft (51) in rotating connection is arranged in the air outlet pipe (54), an air wheel (52) which exhausts outwards is fixedly connected to the air wheel shaft (51), a fourth bevel gear (50) is fixedly connected to the other end of the air wheel shaft (51), the fourth bevel gear (50) is in meshing transmission with the third bevel gear (49), and an air inlet pipe (53) for air inflow is arranged at the edge of the air outlet pipe (54).

4. An apparatus for disinfestation within a tree as claimed in claim 3, wherein: the driven shaft (16) and the driving shaft (17) are connected with a sleeve (45) in a rotating mode, the driven shaft (16) and the driving shaft (17) are fixedly connected with a circular array in the sleeve (45) to form a group, multiple groups of abutting rods (19) are arranged in a linear array mode, ejector rods (41) which are fixedly connected are arranged on the sleeve (45) and correspond to the abutting rods (19), the ejector rods (41) and the abutting rods (19) are abutted when rotating, multiple groups of ejector block grooves (46) are formed in the sleeve (45) and correspond to the ejector rods (41), ejector blocks (42) which are connected in a sliding mode are arranged in the ejector block grooves (46), the ejector blocks (42) are connected with the ejector block grooves (46) through symmetrically arranged retraction springs (43), the ejector blocks (42) are fixedly connected with the ejector rods (41), and the sleeve (45) is wrapped by flexible rubber cloth (44).

5. An in-tree disinfestation apparatus as claimed in claim 4, wherein: one surface of the shell (10) on the other side, opposite to the pressing block (23), of the sleeve (45) is an inwards-concave arc surface.