CN215761555U

CN215761555U - Mechanical lock structure for hydraulic elevator and hydraulic elevator

Info

Publication number: CN215761555U
Application number: CN202122083075.9U
Authority: CN
Inventors: 李学军; 黄海龙
Original assignee: Beijing Jiejiexi Petroleum Equipment Co ltd
Current assignee: Beijing Jiejie West Technology Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-02-08
Anticipated expiration: 2031-08-31

Abstract

The utility model relates to a mechanical lock structure for a hydraulic elevator and the hydraulic elevator. Comprises a floating ring, a driving pin and a rotation limiting component. The drive pin is with rotating spacing subassembly swing joint, and the inboard of floating ring is convex surface structure, and the step hole joint of seting up on the outside and the middle and right door of hydraulic elevator of floating ring. The drive pin passes through the floating ring and makes line contact with the inner side of the floating ring. The inner side of the floating ring is arranged to be a convex surface structure, so that the driving pin and the inner side of the floating ring are in line contact relation. Under the above arrangement, even if chemical slurry is in contact with the mechanical lock structure, the chemical slurry can flow out from the gap between the step hole and the driving pin, the driving pin cannot be blocked in the step hole, the mechanical lock structure can be effectively prevented from being blocked, and the mechanical lock structure has a relatively long safety protection effect.

Description

Mechanical lock structure for hydraulic elevator and hydraulic elevator

Technical Field

The utility model belongs to the technical field of petroleum and natural gas drilling instruments, and particularly relates to a mechanical lock structure for a hydraulic elevator and the hydraulic elevator.

Background

The automation of petroleum drilling operation is a development trend of petroleum drilling machinery, and various hydraulic petroleum tools with high automation degree, such as hydraulic elevators, power drill pipe tongs, power casing tongs, iron roughneck, and the like, are increasingly widely applied.

Taking a hydraulic elevator as an example, in a drilling project, the hydraulic elevator is a necessary tool for hoisting pipes such as drill pipes, oil pipes and casings, and is suspended on a hoisting system so as to perform operations of hoisting or lowering drilling tools, oil pipes, casings and the like to a borehole. In the lifting and lowering processes of a wellhead drilling tool, the hydraulic elevator needs to bear all loads of the drilling tool, a joint of the drilling tool directly contacts with chemical slurry, corrosion, scaling and other phenomena are formed, the hydraulic elevator is blocked, and the phenomenon that the drilling tool is clasped and loosened is unsmooth. The chemical slurry not only pollutes pipes such as drilling tool joints and the like, so that the surface of the pipes is scaled, but also pollutes the hydraulic elevator, particularly, the surface of a core supplement of the hydraulic elevator is scaled, and the hydraulic elevator is further blocked.

The hydraulic elevator in the prior art generally comprises a body, a door opening and closing connecting rod structure, a mechanical lock structure and the like. The body of the hydraulic elevator is connected with the hoisting ring and used for lifting and lowering the drilling tool. The door opening and closing connecting rod structure is used for door opening and closing operation of the hydraulic elevator, and cohesion and loosening of the drilling tool are achieved. The mechanical lock structure adopts a contact lever principle, and when the drilling tool is lifted and lowered, the mechanical lock structure can prevent the emergency door from being loosened accidentally, so that construction accidents are avoided.

The hydraulic elevator in the prior art has the following defects:

the joint of the drilling tool directly contacts with the chemical slurry, and the chemical slurry on the drilling tool corrodes the mechanical lock structure after being clamped with the hydraulic lifting clamp, so that a spring in the mechanical lock structure is often clamped, and the safety protection effect cannot be achieved.

Therefore, there is a need for a mechanical lock structure that is maintenance free and still effective in the case of chemical mud corrosion fouling to ensure safe operation of the hydraulic elevator.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a mechanical lock structure for a hydraulic elevator and the hydraulic elevator, aiming at solving the problem that chemical slurry corrodes the mechanical lock structure in the prior art, so that the mechanical lock structure cannot play a safety protection role.

(II) technical scheme

In order to achieve the purpose, the utility model adopts the main technical scheme that:

a mechanical lock structure for a hydraulic elevator comprises a body, a left door, a right door and a safety door, wherein the mechanical lock structure is used for locking the safety door and the right door; the mechanical lock structure comprises a floating ring, a driving pin and a rotation limiting assembly;

the driving pin is movably connected with the rotation limiting assembly;

the inner side of the floating ring is of a convex structure, and the outer side of the floating ring is clamped with a step hole formed in a right door of the hydraulic elevator;

the drive pin passes through the floating ring and makes line contact with the inner side of the floating ring.

The mechanical lock structure as described above, preferably, the rotation limiting assembly includes a lever, a mechanical lock pin, and a spring;

the driving pin is rotatably connected with the lever, the spring is sleeved on the mechanical lock pin, the bottom of the mechanical lock pin is in contact with the lever surface, and the mechanical lock pin is used for limiting and clamping the safety door;

the driving pin is positioned below the bushing on the hydraulic elevator, and when the bushing descends, the driving pin is driven to descend and drive the lever to rotate, so that the mechanical lock pin is ejected out, and the mechanical lock pin is in limited clamping connection with the safety door.

In the mechanical lock structure, preferably, the gap between the driving pin and the stepped hole is 2-4 mm.

In the mechanical lock structure, preferably, the lever is rotatably connected to the right door by a lever pin;

the lever pin is perpendicular to the lever.

In the mechanical lock structure, preferably, the driving pin is rotatably connected to the lever through a connecting pin.

In the mechanical lock structure, preferably, the upper end surface of the driving pin is in a circular arc shape, and the upper end surface of the driving pin is in contact with the complementary core point.

In the mechanical lock structure, preferably, the mechanical lock pin passes through the mechanical lock pin hole on the right door and is perpendicular to the right door;

the diameter of the bottom of the mechanical lock pin is larger than that of the mechanical lock pin hole;

the diameter of the spring is larger than that of the mechanical lock pin.

In the mechanical lock structure, preferably, the outer side of the floating ring is in interference fit with the stepped hole.

The utility model also discloses a hydraulic elevator which comprises the mechanical lock structure.

(III) advantageous effects

The utility model has the beneficial effects that:

according to the mechanical lock structure, the floating ring is arranged between the driving pin and the step hole formed in the right door of the hydraulic elevator, the outer side of the floating ring is clamped with the step hole formed in the right door of the hydraulic elevator, the driving pin penetrates through the floating ring and is in non-contact relation with the step hole of the right door, even if chemical slurry on a drilling tool is in contact with the mechanical lock structure, the chemical slurry can flow out from a gap between the step hole and the driving pin, the driving pin cannot be blocked in the step hole, and therefore the mechanical lock structure can be effectively prevented from being blocked, and the mechanical lock structure has a relatively long safety protection effect.

In addition, the inner side of the floating ring is provided with a convex surface structure, so that the driving pin and the inner side of the floating ring are in a line contact relationship, therefore, the driving pin can rotate at a certain angle relative to the inner side of the floating ring with the convex surface structure, the driving pin is further prevented from being blocked in a stepped hole by chemical mud, and the service life of the mechanical lock structure is longer.

Drawings

FIG. 1 is a schematic structural view of a mechanical lock according to the present invention;

FIG. 2 is a schematic view of the installation of the mechanical lock structure of the present invention;

FIG. 3 is a cross-sectional view of a floating ring in accordance with the present invention;

FIG. 4 is a structural relationship diagram of the floating ring, the drive pin and the right door of the present invention;

fig. 5 is a schematic structural view of the hydraulic elevator in embodiment 2 in an open state;

FIG. 6 is a top view of the hydraulic elevator of embodiment 2 in an open state;

FIG. 7 is a schematic structural view of the hydraulic elevator of embodiment 2 in a closed state;

FIG. 8 is a schematic configuration diagram of a link structure in embodiment 2;

FIG. 9 is an installation diagram of a link structure in embodiment 2;

fig. 10 is a schematic view showing the construction of the hydraulic elevator in comparative example 1.

[ description of reference ]

1: a body; 2: a connecting rod structure; 3: a left door; 4: a safety door; 5: a mechanical lock structure; 6: a right door; 7: core supplementing; 8: rotating the pin;

9: a first set of links; 91: a first link; 92: a second link; 93: a third link; 10: a rotating base; 11: a fourth link; 12: a dual hydraulic cylinder assembly; 121: a first hydraulic cylinder; 122: a second hydraulic cylinder; 13: a first crank arm; 14: a second crank arm; 15: a third crank arm; 16: a connecting pin;

17: a drive pin; 18: a connecting pin; 19: a lever; 20: a lever pin; 21: a mechanical lock pin; 22: a spring; 23: a floating ring; 24: and (7) lifting lugs.

Detailed Description

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.

Example 1

Referring to fig. 1 to 4, the present embodiment provides a mechanical lock structure for a hydraulic elevator, the hydraulic elevator includes a body 1, a left door 3, a right door 6, and a safety door 4, and the mechanical lock structure is used for locking the safety door 4 and the right door 6. Including the floating ring 23, the drive pin 17 and the rotation limiting assembly. The drive pin 17 with rotate spacing subassembly swing joint, the inboard of floating ring 23 is convex surface structure, the outside of floating ring 23 and the step hole joint of seting up on the right door in the hydraulic elevator. The drive pin 17 passes through the floating ring 23 and is in line contact with the inner side of the floating ring 23.

This embodiment sets up the floating ring between the step hole of seting up on drive pin and right door, the step hole joint of seting up on the outside of this floating ring and the right door, the drive pin passes the floating ring, be non-contact relation with the step hole of right door, even if chemical mud and mechanical lock structure contact on the drilling tool like this, also can flow out in the gap between step hole and the drive pin, can not lead to the drive pin stifled dead in the step hole, consequently, can effectively avoid mechanical lock structure card to die, make mechanical lock structure have comparatively permanent safety protection effect. In addition, this embodiment still sets up the inboard of floating ring to the convex surface structure for the drive pin is the line contact relation with the inboard of floating ring, and the drive pin can carry out certain angle's rotation relatively to the floating ring inboard that has the convex surface structure, has further avoided chemical mud to block up the drive pin in the step hole, makes mechanical lock structure's life longer.

Preferably, the rotation limiting assembly comprises a lever 19, a mechanical lock pin 21 and a spring 22, the driving pin 17 is rotatably connected with the lever 19, the mechanical spring 22 is sleeved on the mechanical lock pin 21, the bottom of the mechanical lock pin 21 is in surface contact with the lever 19, and a certain relative sliding exists between the mechanical lock pin 21 and the lever 19. The line contact structure of the drive pin 17 and the floating ring 23 is effective to overcome the horizontal displacement caused by the rotation of the lever 19 when the lever 19 is rotated. The driving pin 17 is positioned below the complementary core 7, when the complementary core 7 bears the weight and descends, the driving pin 17 is driven to descend and drives the lever 19 to rotate, the mechanical lock pin 21 is ejected, and the mechanical lock pin 21 limits and clamps the safety door 4.

Preferably, the gap between the driving pin 17 and the stepped hole is 2-4mm so that the chemical grout having fluidity smoothly flows out. The drive pin 17 has an upper end diameter smaller than a lower end diameter and a lower end diameter larger than a diameter of the floating ring 23 to limit a stroke of the drive pin 17.

Preferably, the lever 19 is rotatably connected to the right door 6 by a lever pin 20, the lever pin 20 being perpendicular to the lever 19. The drive pin 17 is rotatably connected to a lever 19 via a connecting pin 18. The upper end surface of the driving pin 17 is arc-shaped, and the upper end surface of the driving pin 17 is in point contact with the bushing 7, so that the possibility of chemical slurry blockage is reduced.

Preferably, the mechanical locking pin 21 passes through a mechanical locking pin hole on the right door 6, perpendicular to the right door 6. The bottom diameter of the mechanical lock pin 21 is larger than the diameter of the mechanical lock pin hole, so that the mechanical lock pin 21 is prevented from being ejected out of the right door. The diameter of the spring 22 is larger than the diameter of the mechanical lock pin 21.

Example 2

Referring to fig. 6 to 9, the present embodiment provides a hydraulic elevator, which includes a body 1, a door assembly, a link mechanism 2, and a locking assembly. The door body assembly is movably connected with the body 1, and the locking assembly is connected with the door body assembly to lock the door body assembly.

The door body subassembly includes left door 3 and right door 6, and left door 3 and right door 6 respectively with body 1 swing joint. The locking assembly comprises a safety door 4 and a mechanical lock assembly 5 in embodiment 1, the safety door 4 is movably connected with the left door 3, the mechanical lock assembly 5 is connected with the right door 6, and the safety door 4 locks the left door 3 and the right door 6 through the mechanical lock assembly 5.

Specifically, left door 3 and right door 6 are respectively through changeing round pin 8 and body 1 swing joint, set up mechanical spacing on the body 1 for left door 3, right door 6 can be at the angle internal rotation of settlement, with the cohesion and the release that realize the drilling tool.

Emergency exit

4 and 3 swing joint of left-hand door, it is spacing to set up machinery on the left-hand door 3 for emergency exit 4 can be at the angle internal rotation of setting for, and when emergency exit 4 was opened, tubular columns such as drilling tool can get into hydraulic pressure elevator space. The mechanical lock mechanism 5 is connected with the right door 6, and the safety door 4 locks the safety door 4 and the right door 6 through the mechanical lock mechanism 5. The link mechanism 2 is connected with the body 1, the left door 3, the right door 6 and the safety door 4, and is used for providing driving force for the left door 3, the right door 6 and the safety door 4 so as to enable the left door 3, the right door 6 and the safety door 4 to be clasped or loosened.

Referring to fig. 8 to 9, the link mechanism 2 includes a first link assembly and a second link assembly, and the first link assembly is connected to the left door 3 and the right door 6 to drive the left door 3 and the right door 6 to be locked or unlocked. The second connecting rod assembly is connected with the left door 3 and the safety door 4 and drives the safety door 4 to close or release.

In this embodiment, the first link assembly and the second link assembly are arranged in parallel. The first connecting rod assembly and the second connecting rod assembly are arranged on one sides of the body 1, the left door 3 and the right door 6, which are close to the outer part of the hydraulic elevator.

Further, the hydraulic elevator further comprises a complementary core 7, as shown in fig. 5-7, the complementary core 7 comprises 4 blocks, wherein 2 blocks are fixedly connected with the body 1 through fixing pins, 1 block is fixedly connected with the left door 3 through fixing pins, and the other block is fixedly connected with the right door 6 through fixing pins. The height of the lowermost end of the patch core 7 is higher than the height of the body 1, the left door 3 and the right door 6. In this embodiment, the bushing 7 can be provided with various diameter sizes so as to be selectively replaced according to different pipe column diameters.

The hydraulic elevator further comprises lifting lugs 24, the lifting lugs 24 being mounted on both sides of the body 1, and a control system passing through the lifting lugs to control the lifting, lowering and rotational movement of the hydraulic elevator.

In the prior art, the connecting rod assemblies for controlling the rotation of the left door and the right door are arranged on the inner sides of the connecting rod assemblies for controlling the safety door, and the two groups of connecting rod assemblies are arranged on the inner sides of the hydraulic elevators.

The connecting rod assembly for controlling the left door and the right door is arranged to be of a structure which is parallel up and down, the force arms for opening and closing the left door and the right door of the first connecting rod assembly are increased, and the moment when the hydraulic elevator embraces pipe columns such as a drilling tool joint is increased. In addition, this embodiment sets up link mechanism in the outside one side that is close to the hydraulic elevator, has further increased link mechanism's the arm of force and the moment of opening and shutting the door.

The embodiment increases the torque when the hydraulic elevator embraces the tubular column through the two aspects, so as to smoothly extrude the corrosion layer and the scale formation layer on the surfaces of the tubular columns such as a drilling tool joint and the like and the surface of the complementary core, realize the smooth embracing of the left door, the right door and the safety door, ensure that the hydraulic elevator smoothly carries out the door opening and closing operation, and avoid the problem of jamming of the hydraulic elevator.

In addition, in the embodiment, the link mechanism is arranged on the outer side, and the first link assembly for controlling the left door and the right door and the second link assembly for controlling the safety door are arranged in a vertically parallel position relationship, so that the link mechanism is arranged on the outer side of the hydraulic elevator to the greatest extent, the bending moment borne by the link mechanism can be reduced as much as possible, the link mechanism is prevented from deforming and failing due to too heavy pressure bearing, and the service life of the link mechanism can be prolonged.

Specifically, the first link assembly includes a first link 91, a first crank arm 13, a first hydraulic drive part, a second crank arm 14, and a second link 92. One end of the first connecting rod 91 is connected with the right door 6, one end of the first connecting lever 13 is connected with one end of the first hydraulic driving part, the other end is connected with the first connecting rod 91, one end of the second connecting lever 14 is connected with one end of the hydraulic driving part, and the other end is connected with the left door 3.

The second link assembly includes a second hydraulic driving part, a third crank arm 15, a third link 93, a swivel, and a fourth link 11. One end of the third crank arm 15 is connected with one end of the second hydraulic driving part, the other end is connected with one end of a third connecting rod 93, the other end of the third connecting rod 93 is connected with the rotating seat, the other end of the rotating seat is connected with one end of a fourth connecting rod 11, and the other end of the fourth connecting rod 11 is connected with the safety door 4.

The first crank arm 13, the second crank arm 14 and the third crank arm 15 are connected to the body 1, the first hydraulic driving component and the second hydraulic driving component are a dual hydraulic cylinder assembly 12, and specifically include a first hydraulic cylinder 121 and a second hydraulic cylinder 122. The first hydraulic driving part and the second hydraulic driving part are vertically parallel, the second crank arm 14 and the third crank arm 15 are vertically parallel, and the second connecting rod 92 and the third connecting rod 93 are vertically parallel. In this embodiment, the first link 91, the second link 92, and the third link 93 are identical in structure and size.

Preferably, the first crank arm 13 and the first link 91, the first hydraulic driving part and the second crank arm 14, the second hydraulic driving part and the third crank arm 15, the second crank arm 14 and the second link 92, the third crank arm 15 and the third link 93, the first link 91 and the right door 6 of the hydraulic elevator, and the second link 92 and the left door 3 of the hydraulic elevator are all connected through the connecting pin 16.

The first link 91, the second link 92 and the third link 93 pass through square holes cast on the left and right sides of the body 1, and hydraulic power is transmitted to the left door 3 and the right door 6.

As shown in fig. 4, the first crank arm 13, the second crank arm 14, and the third crank arm 15 are fixed to the main body 1 by the pivot pin 8 so as to be rotatable, and the swivel base 10 is connected to the inside of the groove of the left door 3 by the pivot pin 8.

Preferably, the rotary seat 10 and the fourth link 11 are located outside the left door 3. In the link structure 2 in this embodiment, except that the first link 91, the second link 92, and the third link 93 pass through the square holes cast on the left and right sides of the body 1, all the other transmission components are disposed outside the body 1, the left door 3, and the right door 6, and are easy to detach and maintain. When disassembly and maintenance are needed, the disassembly of the components in the connecting rod structure 2 can be realized by removing the rotating pin 8 and the connecting pin 16.

Example 3

This embodiment provides a method of using the hydraulic elevator of embodiment 2. Referring to fig. 5-6, in the standby state of the hydraulic elevator, the left door 3, the right door 6 and the safety door 4 are all in an open state, waiting for a drilling tool to enter the hydraulic elevator.

Referring to fig. 8 and 9, once the drilling tool enters the hydraulic elevator, i.e. the hydraulic system of the hydraulic elevator is triggered, the dual hydraulic cylinder assemblies 12 in the link structure 2 push the first and second crank

arms

13 and 14 to rotate, the first and second crank

arms

13 and 14 push the first and

second links

91 and 92 to extend, respectively, and the first and

second links

91 and 92 push the left and

right doors

3 and 6 to start to close due to the connection between the first and

second links

91 and 92 and the left and

right doors

3 and 6, respectively.

After the left door 3 and the right door 6 are closed in place, the double-hydraulic-cylinder assembly 12 pushes the third crank arm 15 to rotate, the third crank arm 15 pushes the third connecting rod 93 to extend out, the third connecting rod 93 pushes the rotating seat 10 to rotate, the rotating seat 10 pushes the fourth connecting rod 11 to extend out, and the fourth connecting rod 11 pushes the safety door 4 to begin to close. After the hydraulic elevator is closed, when the drilling tool is lifted and lowered, the safety door 4 and the right door 6 are buckled through the mechanical lock structure 5, so that the hydraulic elevator is prevented from being opened by misoperation, and danger is generated.

Referring to fig. 1, 2 and 7, when the drilling tool is lifted and lowered, the drilling tool drives the bushing 7 to move downwards due to self weight, the bushing 7 pushes the driving pin 17 to move downwards, the driving pin 17 pushes the lever 19 to rotate, and the lever 19 pushes the mechanical lock pin 21 to move upwards against the spring force of the spring 22 to lock the safety door. The action principle of opening the door and unlocking the door is opposite to that of the door, and the detailed description is omitted.

In this embodiment, the first connecting rod 91, the second connecting rod 92, the left door 3 and the right door 6 are connected to the outer sides of the main structure of the left door 3 and the right door 6, the third connecting rod 23 is connected to the rotary seat 10 and is also connected to the outer side of the main structure of the hydraulic elevator, the first connecting rod 91, the second connecting rod 92 and the third connecting rod 93 pass through square holes cast on the left and right sides of the body 1 to provide hydraulic power for the left door 3 and the right door 6, and the second connecting rod 92 for closing the left door 3 and the third connecting rod for closing the safety door 4 are arranged up and down, so that the force arm for closing the door is large, and under the condition of the same hydraulic power, the door-closing torque is large and is several times of that of the existing hydraulic elevator, and under the conditions of corrosion and scaling caused by chemical slurry, the door-closing torque of the elevator can squeeze the corrosion layer and the scaling layer, thereby realizing smooth cohesion between the left door and the right door.

In the link structure 2 of the present embodiment, except that the first link 91, the second link 92, and the third link 93 pass through the square holes cast on the left and right sides of the body 1, the other transmission components are all outside the body 1, the left door 3, and the right door 6, and are easy to detach and maintain.

When rising to rise and transferring the drilling tool, the atress of hydraulic elevator belongs to the simple beam, and in this simple beam, the potential deformation of the middle part of hydraulic elevator is great, and the connecting rod structure 2 of this embodiment is because arranging near the hydraulic elevator main structure outside, and the potential deformation is little, and it is less with transferring the load influence by the drilling tool promotion, more reliable and more stable.

The driving pin 17 and the lever 19 of the embodiment are connected through the connecting pin 18, the section of the inner ring of the floating ring 23 is an arc curve, so that the driving pin 17 and the floating ring 23 are in line contact, and when the lever 19 rotates, the horizontal displacement caused by the rotation of the lever 19 is effectively overcome by the line contact structure. Meanwhile, the driving pin 17 and the right door 6 adopt a non-contact large-gap structure, so that the door still can effectively work even if being corroded and scaled by chemical slurry, the spring 22 cannot reset, and the running safety of equipment can be ensured.

The hydraulic elevator in this embodiment overcomes the cohesion difficulty under the mud corruption, the scale deposit circumstances that current hydraulic elevator exists, and the switch door connecting rod structure is yielding when the hydraulic elevator bears, and the switch door mechanism maintenance difficulty, mechanical lock structure corrode at the mud, the problem of easy inefficacy under the scale deposit. The device is reliable, durable and easy to maintain, and the maintenance time of the device can be greatly reduced. The corrosion layer and the scaling layer can be squeezed off by means of the self door opening and closing torque under the condition that the equipment is corroded and scaled by chemical slurry, and reliable door opening and closing operation is achieved. The mechanical lock driving structure with floating line contact can still work effectively even under the condition of being corroded and scaled by chemical slurry. Thereby improving the safety and efficiency of the drilling operation. Therefore, the embodiment has the advantages of reasonable design principle, high equipment reliability, effective solving of the influence of the service environment of the equipment on the equipment, reduction of equipment maintenance time and cost, improvement of petroleum operation safety and the like.

Comparative example 1

Referring to fig. 10, the present comparative example provides a hydraulic elevator including a body, a left door, a right door, a safety door, and a link mechanism.

According to fig. 10, the link assemblies controlling the rotation of the left and right doors in the present comparative example are disposed inside the link assembly controlling the safety door, and both the link assemblies are disposed at positions inside the hydraulic elevator. Specifically, the links controlling the left and right doors and the safety door are located in the same plane and parallel to each other. The connecting rod assemblies for controlling the left door and the right door are arranged at positions close to the inner part of the hydraulic elevator, particularly close to the bushing, and although the connecting rod assemblies for controlling the safety door are arranged at the outer sides of the connecting rod assemblies for controlling the left door and the right door, the positions of the connecting rod assemblies are still relatively close to the inner side of the hydraulic elevator.

The link mechanism in the comparison example has the defects that the moment for opening and closing the door, particularly for closing the door, of the hydraulic elevator is small, and if corrosion and scaling occur to a drill tool joint, equipment is blocked and difficult to embrace. In addition, the hydraulic elevator can bear hundreds of tons of column pressure in the lifting and descending processes, and the connecting rod mechanism in the comparative example is relatively close to the inner side of the hydraulic elevator, so that more bending moments can be easily borne, and the problem of deformation failure can be caused.

Regarding the above-described problems of the link mechanism in the present comparative example, the following two ways are generally considered to be solved: one is to increase the drive force of the hydraulic drive assembly, but existing hydraulic drive assemblies are mature and the torque that can be increased is limited. Another is to increase the size of the hydraulic elevator so that the moment arm of the linkage mechanism is increased. However, the size of the hydraulic elevator is generally fixed, and thus the size of the hydraulic elevator cannot be directly enlarged.

The hydraulic elevator of embodiment 2 sets up the link assembly that controls left door and right door to be parallel from top to bottom, has increased the arm of force of the switch left door and right door of first link assembly, has increased the moment when hydraulic elevator embraces tubular columns such as drilling tool joint promptly. In addition, the embodiment 2 also arranges the link mechanism at one side close to the outside of the hydraulic elevator, thereby further increasing the moment arm of the link mechanism and the moment of opening and closing the door. Embodiment 2 has increased the moment when hydraulic elevator cohesion tubular column through above-mentioned two aspects to squeeze out the corrosion layer and the scaling layer on tubular column surfaces such as drilling tool joint and the benefit core surface smoothly, realize controlling smooth cohesion of door and emergency exit, guarantee that hydraulic elevator carries out the switch operation smoothly, avoid appearing the problem that hydraulic elevator blocked.

In addition, researches show that the stress type of the hydraulic elevator belongs to a simply supported beam in the process of lifting and lowering the drilling tool. The stress characteristic of the simply supported beam is that the closer to the middle part of the hydraulic elevator, the larger the bending moment born, and the larger the potential deformation. And the bending moment experienced by the components relatively far from the centre of the hydraulic elevator is relatively small. Therefore, in embodiment 2, the link mechanism is disposed at the outer side of the hydraulic elevator, and the first link assembly for controlling the left and right doors and the second link assembly for controlling the safety door are further disposed in a vertically parallel positional relationship, so that the link mechanism is disposed at the outer side of the hydraulic elevator to the maximum extent, and the bending moment borne by the link mechanism can be reduced as much as possible, and therefore, the potential deformation possibility of the link mechanism of the hydraulic elevator in embodiment 2 is reduced, the influence of the lifting and lowering load of the drilling tool is small, and the structure is more stable and reliable.

The above embodiments are merely illustrative, and not restrictive, of the scope of the utility model, and those skilled in the art will be able to make various changes and modifications within the scope of the appended claims without departing from the spirit of the utility model.

Claims

1. A mechanical lock structure for a hydraulic elevator comprises a body (1), a left door (3), a right door (6) and a safety door (4), wherein the mechanical lock structure is used for locking the safety door (4) and the right door (6); the device is characterized by comprising a floating ring (23), a driving pin (17) and a rotation limiting assembly;

the driving pin (17) is movably connected with the rotation limiting assembly;

the inner side of the floating ring (23) is of a convex structure, and the outer side of the floating ring (23) is clamped with a step hole formed in a right door of the hydraulic elevator;

the drive pin (17) passes through the floating ring (23) and is in line contact with the inner side of the floating ring (23).

2. A mechanical lock structure according to claim 1, characterized in that said rotation limiting assembly comprises a lever (19), a mechanical locking pin (21) and a spring (22);

the driving pin (17) is rotatably connected with the lever (19), the spring (22) is sleeved on the mechanical lock pin (21), the bottom of the mechanical lock pin (21) is in surface contact with the lever (19), and the mechanical lock pin (21) is used for limiting and clamping the safety door (4);

the driving pin (17) is located below a bushing on the hydraulic elevator, when the bushing bearing descends, the driving pin (17) is driven to descend and drive the lever (19) to rotate, the mechanical lock pin (21) is ejected, and the mechanical lock pin (21) is in limited clamping connection with the safety door (4).

3. A mechanical lock construction according to claim 1, wherein the gap between the drive pin (17) and the stepped bore is 2-4 mm.

4. A mechanical lock construction according to claim 2, characterized in that the lever (19) is pin-connected to the right door by means of a lever (19);

the lever (19) pin is perpendicular to the lever (19).

5. Mechanical lock structure according to claim 2, characterized in that said driving pin (17) is rotatably connected to said lever (19) by means of a connecting pin (18).

6. Mechanical lock structure according to claim 2, characterized in that the upper end surface of the driving pin (17) is in the shape of a circular arc, the upper end surface of the driving pin (17) being in contact with the complementary core point.

7. A mechanical lock arrangement according to claim 2, characterized in that the mechanical lock pin (21) passes through the mechanical lock pin (21) hole on the right door, perpendicular to the right door (6);

the diameter of the bottom of the mechanical lock pin (21) is larger than that of the hole of the mechanical lock pin (21);

the diameter of the spring (22) is larger than that of the mechanical lock pin (21).

8. Mechanical lock arrangement according to claim 1, characterized in that the outside of the floating ring (23) is interference fitted with the stepped bore.

9. A hydraulic elevator comprising a mechanical lock arrangement as claimed in any one of claims 1 to 8.