CN220599954U - Movable jack oil pump with dust cover - Google Patents

Abstract

The application relates to a portable jack oil pump with dust cover relates to the dust cover field of jack oil pump. The oil pump comprises an oil pump body, wherein the oil pump body comprises an oil tank, a motor with double output shafts and a valve controller, a shell is arranged on an oil pump body cover, a first friction disc which is coaxial with the motor is arranged on an output shaft at one end of the oil tank, a heavy hammer is arranged on the first friction disc, a fan which is coaxial with the motor is arranged at the position corresponding to the shell, a flywheel which is coaxial with the motor is arranged at one side of the fan, a second friction disc which is coaxial with the flywheel is fixedly connected at one end of the flywheel, and the first friction disc slides in a direction away from or close to the second friction disc under the action of the heavy hammer and a spring. The bottom of the oil tank is provided with a bottom plate, and one side, away from the oil pump, of the bottom plate is provided with a brake castor. This application has the effectual dirt-proof effect under the condition that does not influence oil pump heat dissipation.

Description

Movable jack oil pump with dust cover

Technical Field

The application relates to the field of dust covers of jack oil pumps, in particular to a movable jack oil pump with a dust cover.

Background

The jack plays a vital role in pile foundation static load experiments. The jack can apply accurate and controllable vertical load to the tested pile so as to simulate the stress state of the pile under various load conditions in actual engineering, thereby evaluating the bearing capacity of the pile. The components of the jack mainly comprise a jack oil pump and a jack mechanism, wherein the jack oil pump mainly comprises a valve controller, a motor and an oil tank. The valve controller is used for controlling the operation of the oil pump and the valve, and is connected with the oil pump through an oil pipe so as to achieve an ideal working state of the hydraulic system; the motor is the main power source of oil pump, and the motor output shaft links to each other with the oil tank. The oil tank bears hydraulic oil and provides necessary pressure for the oil way, and the side wall of the oil tank is provided with scale marks, so that the oil quantity in the oil tank can be known through the scale marks.

In pile foundation static load experiments, the jack oil pump must run under complicated environmental conditions, dust can adhere to the greasy dirt on equipment surface, and difficult clearance is also received external dust easily to the inside moving part of oil pump, and the dust influences the motor heat dissipation after getting into the motor to influence the life and the reliability of oil pump, so the dust cover is widely used in the experiment. The most common jack oil pump protector's design principle is with oil pump outward appearance cover one deck dust cover to fix in jack oil pump top through various fastening means, thereby can prevent effectively that external dust from getting into inside the oil pump.

To the related art among the above-mentioned, give oil pump outward appearance and cover one deck dust cover, can effectually prevent that the oil pump from being polluted by external dust, nevertheless the dust cover gas permeability is poor, influences oil pump radiating effect to influence oil pump's life.

Disclosure of Invention

In order to achieve a better dustproof effect under the condition of not influencing heat dissipation, the application provides a movable jack oil pump with a dustproof cover

The application provides a portable jack oil pump with dust cover adopts following technical scheme:

the utility model provides a portable jack oil pump with dust cover, includes the oil pump body, the oil pump body includes oil tank, has motor and the valve controller of dual output shaft; the oil pump body is provided with a shell, the shell covers the oil pump body, and the oil pipe penetrates through the shell and is connected with the valve controller; the shell is provided with a coaxially rotating fan at a position corresponding to the motor, and a coaxially rotating flywheel is arranged on one side of the fan, which is close to the oil tank; the output shaft at one end of the motor is used for driving the oil tank, a first friction disk which rotates coaxially is arranged on the output shaft at one end of the motor, which is far away from the oil tank, the first friction disk can move close to or far away from the flywheel, and the first friction disk is provided with a spring; the first friction disc is provided with a heavy hammer, when the oil tank pressurizing motor operates, the heavy hammer drives the first friction disc to be abutted against the flywheel, and when the pressurizing motor stops decelerating, the spring drives the first friction disc to be separated from the flywheel; the shell is provided with an air outlet; an air inlet is formed in the position, corresponding to the fan, of the shell, and filter cotton is arranged at the air inlet; the oil injection pipe is arranged at the position of the shell corresponding to the oil nozzle, the oil nozzle of the oil tank is communicated with the shell through the oil injection pipe, and the shell is provided with an oil cover for covering the section of the oil injection pipe.

Through adopting above-mentioned technical scheme, the shell cover is outside the oil pump body, plays dirt-proof effect, is provided with the filler pipe that has the oil lid on the shell, and filler pipe intercommunication oil tank glib, through the filler pipe on the shell to the oil tank oiling. When the oil tank pressurizing motor operates, the heavy hammer drives the first friction disc to be abutted with the flywheel, the first friction disc drives the flywheel and the fan to rotate synchronously, wind enters the shell from the air inlet after passing through the filter cotton and is blown out from the air outlet, heat generated by the oil pump is taken away, when the pressurizing motor is stopped to decelerate, the spring drives the first friction disc to be away from the flywheel, the flywheel drives the fan to rotate continuously under the action of inertia, when the motor stops operating, the fan can maintain a period of rotation, the waste heat of the oil pump is emitted, the service life of the oil pump is prolonged, the dustproof effect is achieved, the heat dissipation of the motor and the oil pump is not influenced, and the reliability of the jack oil pump is improved.

Optionally, a driving shaft is coaxially and fixedly connected to an output shaft at one end of the motor, which is far away from the oil tank, a driven shaft is coaxially nested in the driving shaft, the driving shaft and the driven shaft synchronously rotate, a spring is coaxially and fixedly connected between the driving shaft and the driven shaft, and the spring applies a force to the driven shaft, which is close to the oil tank; a steel wire rope is fixedly connected between one end of the driven shaft, which is close to the motor, and the heavy hammer, and the driven shaft slides in the driving shaft in a direction away from or close to the motor under the action of the heavy hammer and the spring.

By adopting the technical scheme, the driven shaft slides in the axial direction inside the driving shaft, the heavy hammer slides in the direction of pulling the driven shaft to be far away from the motor through the steel wire rope, and the heavy hammer abuts against the flywheel to provide power for the rotation of the flywheel; when the pulling force of the heavy hammer is reduced, the spring pulls the driven shaft to slide in the direction close to the motor, and the driven shaft is separated from the flywheel.

Optionally, the driving shaft adopts an internal spline shaft, the driven shaft adopts an external spline shaft, and the driving shaft drives the driven shaft to synchronously rotate.

Through adopting above-mentioned technical scheme, the driven shaft nestification is inside the driving shaft, and the internal spline of driving shaft and the external spline of driven shaft mutually support, realize the synchronous rotation of both to the drive weight is rotatory, makes weight drive first friction disc and flywheel butt.

Optionally, the flywheel is close to motor one end and is provided with coaxial line pivoted second friction disc, first friction disc with the terminal surface that the second friction disc contacted each other is provided with the decorative pattern.

Through adopting above-mentioned technical scheme, the frictional force that first friction disc and second friction disc butt were bigger than the frictional force of first friction disc and flywheel butt, and the terminal surface of both contacts all is provided with the decorative pattern, through the roughness that increases the contact surface, has increased frictional force between the two, makes the rotatory process of first friction disc drive second friction disc more reliable, has reduced the possibility that both contact surfaces skid.

Optionally, the oil pump bottom is provided with the bottom plate, the shell can dismantle and connect in the bottom plate.

By adopting the technical scheme, the bottom plate is detachably connected with the shell through the bolts, and the shell can be removed for maintenance when the maintenance is performed, so that the maintenance is more convenient; secondly, when installing, the screw hole of accessible bolt department location bottom plate and the position of shell reduce the assembly degree of difficulty, reduce the installation error.

Optionally, the bottom plate is provided with the brake truckle far away from oil pump one side.

Through adopting above-mentioned technical scheme, the brake truckle can make the oil pump remove more conveniently, and the oil pump can be in the nimble removal of job site, and the brake function of truckle makes the oil pump more stable in complicated field environment.

Optionally, the bottom plate is fixedly connected with a fixed groove body at a position corresponding to the oil tank; rubber blocks are arranged between the bottom of the fixed groove body and the oil tank, rubber pads are arranged around the fixed groove body, and the oil tank is wrapped by the rubber pads.

Through adopting above-mentioned technical scheme, at the removal in-process of oil pump, the oil tank takes place to slide easily, extrudees or collide, and fixed cell body has the locate action to the oil tank, and the rubber piece between oil tank bottom and the fixed cell body bottom plays shock attenuation antiskid function to the oil tank, and fixed cell body rubber pad parcel oil tank all around plays buffering anticollision's effect.

Optionally, a transparent plate is arranged at the position of the casing corresponding to the scale line of the oil tank.

Through adopting above-mentioned technical scheme, the scale mark of oil tank can show the inside oil mass of oil tank in real time, can influence the oil pump operation when the oil mass is not enough in the oil tank, sets up the transparent plate in the position that the shell corresponds the scale mark, both can prevent dust, also does not influence the observation oil tank scale mark.

Optionally, the axial surface of the driving shaft is rounded at the contact position with the steel wire rope.

Through adopting above-mentioned technical scheme, the fillet is handled in the axial face of driving shaft in contact with wire rope, and the driven shaft is connected to wire rope one end, and the weight is connected to the other end bypass driving shaft, and the weight is rotatory to be pulled the driven shaft at motor operation in-process, wire rope and driving shaft axial face contact this moment, wire rope and edge angle position friction damage wire rope easily, and fillet structure can reduce the damage of edge angle to wire rope, extension wire rope life.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the motor operates, the fan is driven to rotate through the contact of the first friction disk and the second friction disk, so that the heat dissipation effect is achieved, when the motor decelerates, the first friction disk is separated from the second friction disk, the fan is driven by the flywheel to rotate for a period of time, the waste heat of the oil pump is dissipated, the service life of the oil pump is prolonged, the better dust prevention effect is achieved under the condition that the heat dissipation of the oil pump is not affected, the reliability of the jack oil pump is improved, and the service life is prolonged;

2. the oil pipe is fixedly connected at the position of the shell corresponding to the oil nozzle, and the funnel-shaped opening is adopted at one side of the shell by the oil pipe, so that the oil injection is more convenient, and the oil cover has a sealing effect on the oil injection pipe, so that the dustproof effect is achieved; the filter cotton at the position of the shell corresponding to the fan filters the wind at the air inlet, so that dust can be prevented from entering; the transparent plate of the outer shell at the position of the scale mark achieves a dustproof effect under the condition that observation is not affected, the oil pump is covered by the whole outer shell, a good dustproof effect is achieved, and pollution of dust to the oil pump is reduced;

3. the shell is connected with the bottom plate in a detachable mode, the oil pump is more convenient to overhaul, the oil pump can be moved and transported by the brake castor, and the oil pump is more stable due to the braking function of the castor when the oil pump needs to be fixed. In the moving process, the oil tank is very easy to slide, extrude or collide in the shell, the fixed groove body can position the oil tank, the rubber block plays a damping and anti-skid function, the rubber pad wraps the oil tank to play a role in buffering and anti-collision, and the moving process of the oil tank is safer and more stable.

Drawings

FIG. 1 is a schematic illustration of a mobile jack oil pump with dust cap according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of a mobile jack oil pump with dust cap according to an embodiment of the present application;

FIG. 3 is an enlarged view of portion A of FIG. 2;

fig. 4 is a schematic view of the structure of the inside of a mobile jack oil pump with dust cover according to an embodiment of the present application.

Reference numerals illustrate: 1. an oil pump body; 11. an oil tank; 111. a nipple; 112. scale marks; 12. a motor; 13. a valve controller; 2. a fan; 21. a flywheel; 22. a second friction plate; 3. a first friction plate; 31. a driving shaft; 32. a driven shaft; 33. a spring; 34. a wire rope; 35. a heavy hammer; 4. a housing; 41. an air inlet; 42. filtering cotton; 43. an air outlet; 44. a filler pipe; 45. an oil cover; 46. a transparent plate; 47. a control gate; 48. a pipe orifice; 5. a bottom plate; 51. braking casters; 52. a fixed groove body; 53. a rubber block; 54. and a rubber pad.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-4.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiment of the application discloses a movable jack oil pump with a dust cover. Referring to fig. 1, the jack oil pump includes an oil pump body 1, the oil pump body 1 includes an oil tank 11, a motor 12 and a valve controller 13, the motor 12 is fixedly connected to the top of the oil tank 11, the valve controller 13 is fixedly connected to one side of the oil tank 11, and a housing 4 is covered outside the oil pump body 1.

Referring to fig. 2 and 3, one output shaft of the motor 12 vertically penetrates through the top of the oil tank 11 downwards, the other output shaft is vertically and coaxially fixedly connected with a driving shaft 31, the driving shaft 31 is an internal spline shaft, a driven shaft 32 is nested in the driving shaft 31, the driven shaft 32 is an external spline shaft, the driving shaft 31 and the driven shaft 32 synchronously rotate, the driven shaft 32 slides in the axial direction inside the driving shaft 31, one end, far away from the oil tank 11, of the driven shaft 32 is fixedly connected with a first friction disc 3 which coaxially rotates, a spring 33 is nested inside the driving shaft 31, and two ends of the spring 33 are respectively and coaxially fixedly connected with the driving shaft 31 and the driven shaft 32. The steel wire ropes 34 are fixedly connected to two sides of the driven shaft 32, which is close to one end of the oil tank 11, the steel wire ropes 34 extend around the driving shaft 31, the heavy weights 35 are fixedly connected to the other end of the driven shaft, the shaft surface of the driving shaft 31 is subjected to round corner treatment at the contact position with the steel wire ropes 34, damage to the steel wire ropes 34 caused by the corner angles is reduced, and two spline teeth are reduced on two sides of the driven shaft 32, which correspond to the positions of the steel wire ropes 34, so that the steel wire ropes 34 extend out of the driving shaft 31. The shell 4 is provided with coaxial pivoted fan 2 in the position department that corresponds driving shaft 31, the shell 4 corresponds fan 2 position rigid coupling and is used for erecting the crossbeam of fan 2, fan 2's pivot rotation is connected in the crossbeam, shell 4 has seted up air intake 41 in the position department that corresponds fan 2, air intake 41 position is provided with filter cotton 42, filter cotton 42 covers air intake 41, prevent that the dust from getting into, air outlet 43 has been seted up to shell 4 in the one end that is close to oil tank 11, fan 2 is close to oil tank 11 position rigid coupling and has coaxial pivoted flywheel 21, flywheel 21 is close to oil tank 11 position rigid coupling and has coaxial pivoted second friction disc 22. When the heavy hammer 35 rotates, under the tension of the heavy hammer 35, the driven shaft 32 overcomes the tension of the spring 33, the driven shaft 32 slides in the direction away from the motor 12 to drive the first friction disk 3 to be close to the second friction disk 22, the contact surfaces of the first friction disk 3 and the second friction disk 22 are provided with patterns to increase friction force, and when the first friction disk 3 contacts with the second friction disk 22, the flywheel 21 and the fan 2, the flywheel 21 drives the second friction disk 22 to rotate, and in the process, energy is stored in the flywheel 21; when the rotation of the heavy hammer 35 is slowed down, the pulling force of the heavy hammer 35 on the driven shaft 32 is insufficient to overcome the pulling force of the spring 33, the driven shaft 32 slides towards the direction close to the motor 12 under the action of the pulling force of the spring 33, the first friction disc 3 is driven to be far away from the second friction disc 22, the two friction discs are separated, the fan 2 continues to rotate under the inertia rotation belt of the flywheel 21, the heat in the shell 4 can be taken away by the rotation of the fan 2, and the aim of dust prevention is achieved while the heat dissipation is not influenced.

Referring to fig. 2 and 4, a bottom plate 5 is arranged at the bottom of the oil pump, four casters 51 with brakes are fixed on one side, far away from the oil tank 11, of the bottom plate 5, the casters adopt universal wheels, the bottom plate 5 is connected with the shell 4 through bolts, and a fixed groove body 52 is fixedly connected to the bottom plate 5 corresponding to the position of the oil tank 11. A strip-shaped rubber block 53 is arranged between the bottom of the fixed groove body 52 and the oil tank 11, a rubber pad 54 is arranged on the periphery of the inner wall, and the oil tank 11 is wrapped by the rubber pad 54. The universal wheel with the braking function enables the oil pump to flexibly move on a construction site and be fixed at an experimental position, the fixed groove body 52 limits the position of the oil tank 11, the rubber block 53 has a damping function, the rubber pad 54 protects the surrounding oil tank 11, the oil tank 11 can be more stable in the moving process, and the bottom plate 5 and the shell 4 are detachably connected through bolts, so that maintenance is facilitated.

Referring to fig. 1 and 2, a filler pipe 44 is disposed at a position corresponding to a nozzle 111 of an oil tank 11 on a housing 4, one end of the filler pipe 44, far from the oil tank 11, is in a funnel shape, the other end of the filler pipe 44 extends into the nozzle 111 of the oil tank 11 and is communicated with the interior of the oil tank 11, an oil cap 45 is connected to one end of the filler pipe 44, close to the housing 4, in a threaded manner, the oil cap 45 is provided with internal threads, the filler pipe 44 is provided with external threads corresponding to the position of the oil cap 45, and the funnel-shaped opening is used for facilitating oil injection, and the oil cap 45 can ensure that the nozzle 111 is not polluted by dust. The shell 4 is provided with a control door 47 at a position corresponding to the valve controller 13, the control door 47 is provided with an oil supply pipe penetrating pipe orifice 48, the periphery of the pipe orifice 48 is fixedly connected with a rubber ring, the oil supply pipe penetrates through the shell 4 through the pipe orifice 48 and is connected with the valve controller 13, and the rubber ring plays a role in sealing. The transparent plate 46 is arranged at the position of the scale mark 112 of the corresponding oil tank 11 on the outer shell 4, the transparent plate 46 can be made of transparent plastic, and an experimenter can observe the scale mark 112 through the transparent plate 46 to know the oil quantity in the oil tank 11.

The implementation principle of the movable jack oil pump with the dust cover is as follows: when the pile foundation static load experiment is carried out, an electric pump is moved to an experiment position, an oil pipe passes through a pipe orifice 48 and is connected to a valve controller 13, a device is connected, a starting device is started, when a motor 12 runs, the motor 12 drives a driving shaft 31 to rotate, the driving shaft 31 drives a driven shaft 32 to synchronously rotate with a heavy hammer 35, under the tension of the heavy hammer 35, the driven shaft 32 drives a first friction disc 3 to overcome the tension of a spring 33 and approach a second friction disc 22, when the first friction disc 3 drives the second friction disc 22, a flywheel 21 and a fan 2 to rotate when the first friction disc and the second friction disc are contacted, the fan 2 enables wind to enter from an air inlet 41, the wind blows out from an air outlet 43 through an oil pump body 1, and the flywheel 21 stores energy in the synchronous rotation process; when the motor 12 is decelerating, the pulling force of the heavy hammer 35 to the driven shaft 32 is insufficient to overcome the pulling force of the spring 33, the driven shaft 32 drives the first friction disk 3 to be far away from the second friction disk 22 under the action of the pulling force of the spring 33, the first friction disk and the second friction disk are separated, the fan 2 is driven to continue rotating under the rotation inertia of the flywheel 21, when the motor 12 stops rotating, the fan 2 can still maintain rotating for a period of time, the waste heat of the oil pump body 1 is emitted, and the shell 4, the oil cover 45 and the filter cotton 42 can effectively prevent dust from polluting the oil pump body 1.

The embodiment of the application has the effect of effectively preventing dust under the condition of not affecting the heat dissipation of the oil pump body 1.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (9)

1. A portable jack oil pump with dust cover, its characterized in that: the oil pump comprises an oil pump body (1), wherein the oil pump body (1) comprises an oil tank (11), a motor (12) with double output shafts and a valve controller (13); the oil pump comprises an oil pump body (1), a valve controller (13) and an oil pipe, wherein the oil pump body (1) is provided with a shell (4), the oil pump body (1) is covered by the shell (4), and the oil pipe penetrates through the shell (4) and is connected with the valve controller (13); the shell (4) is provided with a coaxially rotating fan (2) at a position corresponding to the motor (12), and a coaxially rotating flywheel (21) is arranged on one side of the fan (2) close to the oil tank (11); an output shaft at one end of the motor (12) is used for driving the oil tank (11), a first friction disc (3) which rotates coaxially is arranged on the output shaft at one end of the motor (12) away from the oil tank (11), the first friction disc (3) can move close to or away from the flywheel (21), and a spring (33) is arranged on the first friction disc (3); the first friction disc (3) is provided with a heavy hammer (35), when the oil tank (11) pressurizes the motor (12) to run, the heavy hammer (35) drives the first friction disc (3) to be abutted against the flywheel (21), and when the pressurizing motor (12) is stopped to decelerate, the spring (33) drives the first friction disc (3) to be separated from the flywheel (21);

an air inlet (41) is formed in the position, corresponding to the fan (2), of the shell (4), and filter cotton (42) is arranged in the air inlet (41); the shell (4) is provided with an air outlet (43); the oil injection pipe (44) is arranged at the position of the shell (4) corresponding to the oil nozzle (111), the oil nozzle (111) of the oil tank (11) is communicated with the shell (4) in a penetrating mode, and an oil cover (45) covering the section of the oil injection pipe (44) is arranged on the shell (4).

2. The mobile jack oil pump with dust cap of claim 1, wherein: a driving shaft (31) is coaxially fixedly connected to an output shaft of one end, far away from the oil tank (11), of the motor (12), a driven shaft (32) is coaxially nested in the driving shaft (31), the driving shaft (31) and the driven shaft (32) synchronously rotate, a spring (33) is coaxially fixedly connected between the driving shaft (31) and the driven shaft (32), and the spring (33) applies force to the driven shaft (32) close to the oil tank (11); a steel wire rope (34) is fixedly connected between one end, close to the motor (12), of the driven shaft (32) and the heavy hammer (35), and the driven shaft (32) slides in the driving shaft (31) in a direction away from or close to the motor (12) under the action of the heavy hammer (35) and the spring (33).

3. The mobile jack oil pump with dust cap of claim 2, wherein: the driving shaft (31) adopts an internal spline shaft, the driven shaft (32) adopts an external spline shaft, and the driving shaft (31) drives the driven shaft (32) to synchronously rotate.

4. The mobile jack oil pump with dust cap of claim 1, wherein: the flywheel (21) is provided with a second friction disc (22) which rotates coaxially near one end of the motor (12), and the end face of the first friction disc (3) and the end face of the second friction disc (22) which are in contact with each other are provided with patterns.

5. The mobile jack oil pump with dust cap of claim 1, wherein: the bottom of the oil pump is provided with a bottom plate (5), and the shell (4) is detachably connected to the bottom plate (5).

6. The mobile jack oil pump with dust cap of claim 5, wherein: and a brake castor (51) is arranged on one side, far away from the oil pump, of the bottom plate (5).

7. The mobile jack oil pump with dust cap of claim 5, wherein: the bottom plate (5) is fixedly connected with a fixed groove body (52) at a position corresponding to the oil tank (11); rubber blocks (53) are arranged between the bottom of the fixed groove body (52) and the oil tank (11), rubber pads (54) are arranged around the fixed groove body (52), and the oil tank (11) is wrapped by the rubber pads (54).

8. The mobile jack oil pump with dust cap of claim 1, wherein: a transparent plate (46) is arranged at the position of the shell (4) corresponding to the scale mark (112) of the oil tank (11).

9. The mobile jack oil pump with dust cap of claim 2, wherein: the axial surface of the driving shaft (31) is subjected to fillet treatment at the contact position with the steel wire rope (34).