JPH0324711Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a pipe clamp device for clamping pipes of various diameters, and in particular to a pipe clamp device suitable for a pipe conveying device used in an oil drilling rig. .

(Prior art) Conventionally, when drilling an oil field on land or under the sea using an oil drilling rig, a large number of pipes (drilling pipes,
Casing pipe, riser pipe) will be used to excavate deep into the soil.

A large number of the pipes are stored in a pipe rack near the drilling tower, sorted by diameter and type, and it is necessary to transport these pipes one by one from the pipe rack to the drill floor of the drilling tower.

Therefore, conventionally, as shown in FIG. 7, a bridge crane 101 that can move above the pipe storage formed in the pipe rack 102 on one side of the drilling tower 100 is provided, and the bridge crane 101 is mounted at both ends of the bridge crane 101 as shown in FIG. A pipe conveying device having a hook-type pipe clamping device that is provided with a hook 104 that can be raised and lowered as shown in FIG. Pipes 10 of different diameters are attached to a bridge crane 101 as shown.
Pipe clamp device 105 that clamps each pipe
Pipe clamp devices 105A, 105 suitable for the diameter, with A, 105B, and 105C movable up and down.
A pipe conveying device is used that has a pipe clamp device with a combination of clamps that grips and conveys the pipe 103 with B and 105C.

On the other hand, Japanese Unexamined Patent Publication No. 55-161191 describes two types of pipe clamp devices that are installed in oil drilling equipment and can clamp pipes of various diameters.

The first pipe clamp device (No. 20 of the publication)
21), a pair of left and right jaw members are attached to the clamp body so that they can be opened and closed, and these clamp members can be driven open and closed by a hydraulic motor via a rack and pinion mechanism. The member is configured to clamp the pipe. The second clamp device (Figures 32 and 33 of the publication)
In Figure), a pair of left and right jaw members are attached to the clamp body so that they can be opened and closed, one jaw member has a V-shaped pipe holding part, and the other jaw member has a shorter tip. The jaw members are hinged to the parts, and the pair of jaw members are easily connected by a hydraulic motor.
The pipe can be opened and closed via a pinion mechanism, and the pipe is held by these jaw members and fingers.

On the other hand, Japanese Utility Model Application No. 50-119209 describes a clamping device that is attached to the undulating beam of a civil engineering construction vehicle and used for transporting wood or the like. This clamp device has one left and right one at the bottom end of the clamp body.
A pair of curved root-side claw members are attached to each other via front-rearward pins so as to be able to swing open and close, and a curved tip-side claw member is attached to the lower end of each base-side claw member to open and close via front-rear pins. A pair of left and right opening/closing hydraulic cylinders are provided so as to be swingable, and each pair of left and right base claw members is swingably driven to open and close, and a tip end claw member is swingably driven relative to each base claw member. It is equipped with a hydraulic cylinder for relative refraction.

(Problems to be Solved by the Invention) In the hook-type pipe clamp device of the pipe conveying device, when the hook is engaged with the end of the pipe, a protection is provided to protect the connecting screw portion provided at the end of the pipe. It is necessary to remove the cap and engage the hook with the end of the pipe, which not only requires a great deal of labor and time, but is also often dangerous. Furthermore, the hooks engaged with both ends of the pipe may damage the threads of the connecting thread, rendering the pipe unusable.

On the other hand, when a pipe clamp device is provided that is suitable for each pipe having a diameter within a predetermined range, there is a problem that the types and number of pipe clamp devices increase, and the equipment cost becomes extremely high.

In the first and second pipe clamp devices of the former publication, the distance from the pipe holding part of the pair of jaw members to the clamp body is not configured to be variable, so the range of variation in the diameter of the pipe to be clamped cannot be changed. Also, the total width of the pipe clamp device increases in proportion to the maximum diameter of the pipe to be clamped, and the rack and pinion mechanism and sliding guide part require various complex and high precision structures. The production cost of the device is high because processed structural parts are used, and the recessed shape of the pipe gripping part of the jaw member has a fixed angle, so for cylindrical pipes, it is necessary to grasp the pipe with four points of support.
However, if there is a buoyancy material or control pipe on the outside of the pipe such as a riser pipe, and the comprehensive line of the pipe cross section including these accessories is not circular, it may be difficult to grasp and hold the pipe.
There are problems such as instability.

In the clamp device of the latter publication,
It was originally devised for the purpose of being attached to the tip of a hoisting boom installed on a civil engineering construction vehicle to carry lumber, etc., in a pinched manner. 1 book
It is intended to be picked up and transported in bundles, and is designed to securely grasp and hold pipes of different types from 2" to 40" one by one, and to be able to stand vertically. It is not something that is taken into account.

In other words, with the mechanism of this device, the minimum pipe diameter that can be reliably grasped and held using both the base side claw member and the tip side claw member is limited to approximately the distance between the bases of the base side claw members. If the pipe is smaller than this, 2 at the curved part of the base claw member.
Needless to say, the pipe is only supported at a point, making grasping and holding the pipe uncertain and unstable, and the claw member on the tip side is not useful. Also, at this time,
If the pipe is supported only by the claw member on the tip side, the pipe may not touch the claw member on the base side, and the grip on the pipe may become loose, making it impossible to stand the pipe vertically. be.

Furthermore, in addition to the fact that the length of the proximal claw member and the curvature of the curved part are constant, the distal claw member may not be useful at all depending on the diameter of the pipe, so grasping and holding pipes of various diameters is possible. The number of points varies from 2 to 5 points depending on the diameter of the pipe, and there is a problem in that it is difficult to grasp and hold the pipe in a reliable and stable manner.

(Means for Solving the Problems) The pipe clamp device according to the present invention has a pair of left and right parallel link mechanisms that are movable in a plane orthogonal to the front and back direction on both left and right sides of the clamp body, and each parallel link mechanism is , a first link member whose inner end is connected to the upper end of the clamp body and extends outward; a second link member whose upper end is connected to the middle of the first link member and extends downward; and the inner end of which is connected to the clamp body. connected to the lower end of the main body and extending outwardly and having a second section at the outer end;
a third link member connected to the lower part of the link member, and a pair of left and right sliding members each connected to the lower part of the pair of left and right second link members so as to be movable up and down by a predetermined stroke and extending downward. a pair of left and right opposing clamp members connected to the lower ends of the pair of left and right sliding members so as to be rotatable about an axis in the front and rear directions, and clamping the left and right sides of the lower portion of the pipe; A pair of clamp members are provided, a contact portion for receiving the upper part of the pipe is provided at the lower end of the clamp body, and the left and right one
A pair of left and right opening/closing hydraulic cylinders are provided for driving the pair of first link members to swing in the vertical direction relative to the clamp body with the inner ends thereof as rotation centers; a first connecting means connected to an upper end of the sliding member;
A connecting means capable of moving the sliding member up and down in response to vertical swinging of the link member is provided, and the left and right 1
A pair of left and right clamping hydraulic cylinders are provided for swinging the pair of clamp members in the vertical direction relative to the sliding member, respectively, about the connection portion with the lower part of the sliding member.

(Function) In the pipe clamping device according to the present invention, basically, the upper end of the pipe is received by the abutment part, and the left and right sides of the pipe are held by the left and right clamp members, thereby clamping three places on the outer circumferential surface. It's getting old.

A pair of opening/closing hydraulic cylinders are used to open and close the
The left and right parallel link mechanisms can be opened and closed by driving the link members to swing up and down, and each sliding member can be driven up and down by the connecting means in accordance with the up and down swing of the first link member. Each clamp member can be driven to swing vertically relative to the sliding member by the clamp hydraulic cylinder. Therefore, the left and right positions and swing positions of the pair of left and right clamp members can be changed independently, and the left and right sliding members and clamp members move up and down in response to the closing and opening operations of the parallel link mechanism. Therefore, pipes of various diameters from small to large can be reliably and stably clamped.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 is a schematic overall perspective view of an oil drilling rig installed on an offshore workbench for offshore oil field drilling. A pipe rack 2 (pipe storage) is arranged in front of a drilling tower 1, and a pipe 3 (casing pipes, riser pipes, etc.) are sorted and stored by type and diameter, and the pipes 3 are supplied from the pipe rack 2 to the pipe hanger 5 of the drilling tower 1 by the pipe conveying device 4. The pipe conveying device 4 is a pipe rack 2.
This is a self-propelled pipe transport device 4 configured to reciprocate on two rails 6 laid along a pipe rack 2 between the pipe rack 2 and the drilling tower 1.

The pipe conveying device 4 includes a truck 7 that runs on the rails 6, and a swivel table 8 that is mounted on the truck 7 so as to be horizontally rotatable and is driven to rotate by a rotation drive means.
A multi-joint arm 10 whose lower end is hinged to the swivel base 8 and is driven to swing up and down by a hydraulic cylinder 9 serving as a swing drive means, and a pipe provided at the tip end of the multi-joint arm 10. A clamp device 20 is provided.

The multi-joint arm 10 includes a first arm member 11
, a second arm member 12 , and a third arm member 13 , the lower end of the first arm member 11 is hinged to a pair of brackets at the upper part of the swivel base 8 by a horizontal support shaft, and and the first arm member 1
Hydraulic cylinder 9 is mounted on the middle part of 1.
It is designed to be oscillatingly driven.

The lower end of the second arm member 12 is attached to the upper end of the first arm member 11 with a support shaft 12a parallel to the support shaft.
The proximal end (lower end) of the third arm member 13 is hinged to the tip (upper end) of the second arm member 12 by a support shaft parallel to the support shaft 12a. A hydraulic cylinder 18, which is attached to the upper part of the first arm member 11 and the distal end portion of the second arm member 12,
The arm member 11 and the second arm member 12 are driven to bend, extend, and swing relative to each other, and the distal end portion of the second arm member 12 and the proximal end portion of the third arm member 13 are aligned with each other on the rear side of the arm 10. The second arm member 12 and the third arm member 13 are driven to bend and extend and swing relative to each other by a mounted hydraulic cylinder 19. With the above configuration, the multi-joint arm 1
0 is the hydraulic cylinder 9, 18, 1 in the vertical plane
9, the third arm member 13 is driven to bend and extend almost freely, and the inclination of the third arm member 13 and the distance from the swivel base 8 can be freely adjusted.

Next, the pipe clamp device 20 attached to the tip of the third arm member 13 will be explained.

As shown in FIGS. 2 to 4, a pair of front and rear support brackets 21 are fixed to the upper end of the third arm member 13, and an abutment for receiving the upper end of the pipe 3 is attached to the lower end of the third arm member 13. A box bracket 23 having a portion 22 is fixed thereto, and the third arm member 13, the support bracket 21, and the box bracket 23 constitute a clamp body 24. A pair of left and right parallel link mechanisms 25 that are movable in a plane perpendicular to the front-rear direction are symmetrically arranged on both left and right sides of the clamp body 24.

Each of the parallel link mechanisms 25 includes a first link member 26, a second link member 27, and a third link member 28, each of which is a set of two plate members.

The first link member 26 is arranged in the left-right direction so as to extend from the upper side of the third arm member 13 to the outside of the side surface of the third arm member 13, and its inner end is attached to the support bracket 21 with a pin 29 facing forward and backward. Rotatably connected. The second link member 27 is arranged vertically, and its upper end is rotatably connected to the middle part of the first link member 26 by a front-rear pin 30. The third link member 28 is disposed in a horizontal dogleg shape and faces in the left-right direction, and its inner end is rotatably connected to the box bracket 23 with a front-rear pin 31, and its outer end is rotatably connected to the lower part of the second link member 27 by a pair of pins 32 facing forward and backward.

The pair of left and right sliding members 33 are each made of a set of two plate members, and each of the pair of sliding members 33 moves a predetermined stroke in the vertical direction to the lower part of the second link member 27 of the corresponding parallel link mechanism 25. Connected for free movement. That is, the protrusions 3 are provided on both front and rear sides of the upper end of each sliding member 33.
4 are formed, and these convex portions 34 form a pair of vertically elongated guide grooves 3 in the front and rear of the second link member 27.
5 in a vertically slidable manner for a predetermined stroke.

The pair of left and right clamp members 36 are disposed symmetrically so as to face each other, and are rotatably connected to the lower ends of the corresponding sliding members 33 by front-rearward pins 37.

A pair of left and right opening/closing hydraulic cylinders 38 are provided which open and close the parallel link mechanism 25 by driving the first link members 26 of the left and right pair of parallel link mechanisms 25 to swing up and down about their inner ends as rotation centers. The inner end of the cylinder body of each opening/closing hydraulic cylinder 38 is connected to the upper outer end of the support bracket 21 by a longitudinal pin 39, and the outer end of the rod is connected to the pin 30.

In each parallel link mechanism 25, a sliding hydraulic cylinder 40 is provided as a connecting means for connecting the outer end of the first link member 26 and the upper end of the sliding member 33, and the upper end of the cylinder body is connected to the first link. It is rotatably connected to the outer end of the member 26 by a front-back pin 41, and the lower end of the rod is rotatably connected to the upper end of the sliding member 33 by a front-rear pin 42.

Each clamp member 36 is attached to the sliding member 33
A clamping cylinder 43 is provided which is driven to swing up and down relative to the clamp cylinder 43, and the upper end of the cylinder body is rotatably connected to the vicinity of the upper end of the sliding member 33 by a front-rearward pin 44. The lower end portion is the pin 3 of the clamp member 36
It is rotatably connected to the outer end portion outside of 7 with a front-rearward pin 45. A presser portion 46 for pressing the lower portion of the pipe 3 is formed on the upper surface of the inner end side of each clamp member 36 .

The operation of the pipe clamp device 20 explained above will be explained. For the small diameter pipe 3, the fourth
As shown in the figure, the left and right opening/closing hydraulic cylinders 38
When the left and right first link members 26 are swung upward, the left and right second link members 27 are moved toward the clamp main body 24 side. In parallel with this, when the left and right sliding members 33 are raised by the left and right sliding cylinders 40, the left and right clamp members 36 are moved upward. As a result, the left and right holding parts 46 approach the contact part 22, so by driving the left and right clamping hydraulic cylinders 43 in the clamping direction, the small diameter pipe 3 is securely held between the contact part 22 and the left and right holding parts 46. It can be stably clamped. On the other hand, for the large-diameter pipe 3, as shown in FIG. When the left and right presser parts 46 are significantly lowered, the left and right presser parts 46 are separated from the contact part 22, so by clamping and driving the left and right clamping hydraulic cylinders 43, the large diameter pipe 3 is moved between the contact part 22 and the left and right presser parts 46. This allows for reliable and stable clamping.

Next, the above embodiment can be partially modified to have the following configuration.

(1) Instead of the slide cylinder 40, a turnbuckle, which is a length-adjustable connecting member, or a fixed-length connecting member is provided. That is, when the first link member 26 swings upward, its outer end also moves upward, so that the sliding member 33 can be moved upward via the connecting member.

(2) In order to always open and close the left and right parallel link mechanisms 25 symmetrically and synchronously, a synchronizing link mechanism is provided as shown in FIGS. 5 and 6, and the left and right parallel link mechanisms 25 are The pair of first link members 26 are operated synchronously. That is, each first left and right
A pair of front and rear inner end portions of the link member 26 are rotatably connected to a pair of front and rear pivot brackets 50 erected at the upper end of the third arm member 13 by respective front and rear pins 51 . Instead of the support bracket 21, a pair of V-shaped front and rear support brackets 21A are erected and fixed to the upper end of the third arm member 13, and these support brackets 2
The lower end of the support bracket 21A protrudes into the opening 52 formed in the third arm member 13.
A guide slit 53 is formed vertically in the central portion of the guide slit 53 . An arm portion 54 extending upward by a predetermined length is formed at the inner end portion of each first link member 26, and an outer end portion of a link plate 55 is connected to each arm portion 54 with a pin 56. A front-rear pin 58 inserted through the inner end of the plate 55, the inner end of the rear left and right link plates 55, and the lower end of the pair of front and rear connectors 57 is inserted through the guide slit 53 and guided. Front and rear connectors 57
A pin 59 extending forward and backward is inserted through the upper end of the guide slit 53 . A pair of left and right opening/closing cylinders 38A are arranged in an inclined manner,
The upper end of the cylinder body of each opening/closing cylinder 38A is rotatably connected to the upper end of the corresponding support bracket 21A by a front-rearward pin 60, and the lower end of the rod 38a is rotatably connected to a pin 59. ing. Therefore, when the rod 38a of the left and right opening/closing cylinders 38A is extended and the connector 57 is lowered along the guide slit 53, the left and right first link members 26 synchronously swing upward about the pin 51. When the pin 59 is moved to the upper end of the guide slit 53 by retracting the rod 38a, the left and right first link members 26 synchronously swing downward as shown in the figure with the pin 51 as the center of rotation. It turns out.

(Effect of the invention) As described above, according to the pipe clamp device according to the invention, parallel link mechanisms are provided on both sides of the clamp body, and the lower part of the second link member of each parallel link mechanism is moved by a predetermined stroke in the vertical direction. The clamp member is connected to the lower end of the freely attached sliding member, and a pair of left and right opening/closing hydraulic cylinders and a clamping hydraulic cylinder are provided with connecting means, so that the left and right parallel link mechanisms can be moved in the direction closer to the clamp body. When closed, the left and right clamp members can be moved relatively close to each other, and the left and right sliding members and clamp members can be moved upward to bring the left and right clamp members closer to the contact portion. Since the left and right clamp members can be moved apart and lowered and moved away from the abutting part, the holding part of the clamp member can always be used effectively and a single type of pipe clamp device can handle everything from extremely small diameter pipes to large diameter pipes. It can be grasped and held reliably and stably.

In addition, the pipe is gripped and held at three points, which are always divided into three equal parts on the circumference of the pipe, regardless of the diameter of the pipe, by the contact part at the lower end of the clamp body and the holding part of both clamp members. It is possible to hold and hold the pipe stably and reliably, and even pipes whose cross section including the appendages on the outer periphery of the pipe are not circular can be held stably and reliably with three-point support.

In addition, one type of pipe clamp device can stably and reliably hold pipes from extremely small diameters to large diameter pipes, and when gripping a pipe, the top surface of the pipe is placed in contact with the abutting part at the bottom end of the clamp body. This makes it easy to position the clamp body when grasping a pipe, and has many advantages, such as the ability to easily automate pipe grasping, holding, and conveyance.

[Brief explanation of the drawing]

1 to 6 show a clamping device for a pipe for an oil drilling rig according to an embodiment of the present invention, FIG. 1 is a schematic overall perspective view of the oil drilling rig, and FIG. 2 is a perspective view of the clamping device. , Fig. 3 is a front view of a large-diameter pipe clamped, Fig. 4 is a front view of a small-diameter pipe clamped, Fig. 5 is a perspective view of the main part of a modified example, and Fig. 6 is a front view of the same. , Figures 7 to 9
The figures relate to a conventional example; FIG. 7 is a schematic overall perspective view of an oil drilling rig, FIG. 8 is a side view of a hook-type bridge crane, and FIG. 9 is a front view of a clamp-type bridge crane. 20... Pipe clamp device, 22... Contact portion, 24... Clamp body, 25... Parallel link mechanism, 26... First link member, 27... Second link member, 28... Third link member , 33... sliding member, 36... clamp member, 38
... Hydraulic cylinder for opening and closing, 40 ... Hydraulic cylinder for sliding, 43 ... Hydraulic cylinder for clamping.

Claims (1)

[Scope of utility model registration request] A pair of left and right parallel link mechanisms are provided on both the left and right sides of the clamp body, which are movable in a plane perpendicular to the front and back direction.
Each parallel link mechanism includes a first link member whose inner end is connected to the upper end of the clamp body and extends outward, and a second link member whose upper end is connected to the middle part of the first link member and extends downward; A third member whose inner end is connected to the lower end of the clamp body, extends outwardly, and whose outer end is connected to the lower part of the second link member.
a pair of left and right sliding members connected to the lower portions of the pair of left and right second link members so as to be movable up and down over a predetermined stroke and extending downward; A pair of left and right clamp members are provided at the lower end of the pipe, each pair of left and right clamp members being connected to each other so as to be rotatable about an axis in the front and rear directions, and which hold down both left and right sides of the lower portion of the pipe, A pair of left and right first link members are provided at the lower end of the main body to receive the upper part of the pipe, and the pair of left and right first link members are driven to swing in the vertical direction with respect to the clamp main body with the inner ends thereof as rotation centers. A connecting means is provided with an opening/closing hydraulic cylinder, and is connected between the outer end of each of the first link members and the upper end of the sliding member, and the connecting means is configured to slide in response to vertical swinging of the first link member. A pair of left and right clamp members are provided with connecting means capable of moving the members up and down, and each of the pair of left and right clamp members is driven to swing in the vertical direction relative to the sliding member with the connecting portion with the lower part of the sliding member as a rotation center. A pipe clamp device characterized by being equipped with a hydraulic cylinder for clamping.