Adjustable crown block structure

Abstract

The utility model discloses an adjustable crown block structure which comprises a crown block seat arranged at the top of a derrick, a crown block frame arranged at the top of the crown block seat and crown block pulley assemblies arranged at the two ends of the crown block frame. The crown block frame is connected with the derrick through a hydraulic oil cylinder, a locking pin and a rotating pin are arranged at the upper end of the crown block seat side by side, a locking hole and a rotating shaft hole are formed in the positions, corresponding to the locking pin and the rotating pin, of the middle of the crown block frame respectively, and the rotating pin penetrates into the rotating shaft hole to enable the crown block frame to be rotationally connected with the derrick. The crown block is in a locked state; the crown block pulley assembly comprises a winch side pulley block and a wellhead side pulley block, the winch side pulley block is composed of a three-wheel dead rope wheel and a single-wheel fast rope wheel, and the wellhead side pulley block is composed of a four-wheel main pulley. The dead rope wheel and the fast rope wheel are fixed by using the same crown block shaft, so that the crown block is arranged more compactly, and the locking pin realizes fixation in an operation state and a moving state through the crown block frame locking hole and the fixing lug plate.

Description

Technical Field

[0001] The utility model relates to the field of vertical workover rig derricks, and more specifically, to an adjustable overhead crane structure. Background Art

[0002] With the continuous advancement of oil development projects, the personalized requirements for drilling and workover equipment in different regions and under different working conditions are also increasing. Due to the limitations of well site sites and automated tools for workover operations, an upright derrick is set up on the vehicle-mounted workover rig to meet the operating requirements of different regions. Therefore, it is necessary to design a crane structure that meets the particularity of the upright derrick.

[0003] The existing vertical derrick crane layout is the same as the conventional workover derrick layout, resulting in a small wellhead operating space. The derrick is erected on the drilling table to ensure the operating space for personnel. In addition, a self-balancing crane extends the pulley position to the wellhead side to meet the size of the operating space. The vertical derrick adopts the conventional crane layout, the wellhead operating space is small, and the safety risk of personnel is increased; the self-balancing crane extends to both ends of the wellhead side and the winch side, and has higher requirements for transportation conditions. Utility Model Content

[0004] The utility model aims to provide an adjustable crane structure, in which the dead rope pulley and the fast rope pulley are fixed by the same crane axle, so that the crane arrangement is more compact, and the locking pin is fixed in the operating state and the transporting state through the locking hole of the crane frame and the fixing ear plate.

[0005] The technical solution adopted by the utility model to solve this technical problem is: providing an adjustable crane structure, including a crane seat arranged on the top of the derrick, a crane frame arranged on the top of the crane seat and a crane pulley assembly arranged at both ends of the crane frame;

[0006] The crane frame is connected to the derrick through a hydraulic cylinder. A locking pin and a rotating pin are arranged in parallel on the upper end of the crane seat. A locking hole and a rotating shaft hole are arranged in the middle of the crane frame at positions corresponding to the locking pin and the rotating pin. The rotating pin is inserted into the rotating shaft hole so that the crane frame is rotatably connected to the derrick. When the crane is working, the locking pin is inserted into the locking hole so that the crane is in a locked state.

[0007] The overhead crane pulley assembly comprises a winch side pulley block and a wellhead side pulley block, wherein the winch side pulley block is composed of a three-wheel dead rope pulley and a single-wheel fast rope pulley, and the wellhead side pulley block is composed of a four-wheel main pulley.

[0008] Preferably, the adjustable crown block structure comprises a fixed ear plate arranged on the crown block frame, so that when the crown block is in a moving state, the locking pin penetrates into the fixed ear plate to lock the crown block.

[0009] Preferably, the adjustable crane structure comprises a limit block arranged on the crane seat, so that when the crane frame contacts the limit block, the locking pin penetrates into the fixed ear plate.

[0010] Preferably, in the adjustable crown block structure, the pulleys in the crown block pulley assembly are all arranged transversely.

[0011] Preferably, in the adjustable overhead crane structure, locking holes and fixing ear plates are provided on both sides of the overhead crane frame, locking pins are provided on both sides of the overhead crane seat, and the number of the locking holes, fixing ear plates and locking pins are all two.

[0012] The utility model at least has the following beneficial effects:

[0013] 1. The utility model arranges the pulleys on both sides of the crown block. The dead rope pulley and the fast rope pulley on the winch side use the same crown block axle. The main pulley on the wellhead side has four wheels, and the swimming system passes smoothly. The crown block is arranged more compactly to ensure the stability of the derrick operation.

[0014] 2. The fixing method of the utility model is that the locking pin is fixed through the locking pin hole of the crown block frame and the fixing ear plate in the operating state and the transport state. In the transport state, the crown block is retracted into the upper body of the derrick to avoid the occurrence of over-limit conditions.

[0015] 3. The utility model only needs a single hydraulic cylinder to realize the flipping function.

[0016] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an adjustable overhead crane structure of the utility model when the overhead crane is in a working state;

[0018] Figure 2 It is a structural schematic diagram of an adjustable overhead crane structure of the utility model when the overhead crane is in a moving state;

[0019] Figure 3 It is a top view of a crown block assembly in an adjustable crown block structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the pulley travel in an adjustable overhead crane structure of the utility model;

[0021] Explanation of the reference numerals in the accompanying drawings: 1. overhead crane frame, 2. overhead crane seat, 3. overhead crane pulley assembly, 31. winch side pulley group, 311. dead rope pulley, 312. fast rope pulley, 32. wellhead side pulley group, 321. main pulley, 4. hydraulic cylinder, 5. locking pin, 6. swivel pin, 7. pin hole, 8. shaft hole, 9. fixing ear plate, 10. limiting block, 11. derrick, 12. frame guide wheel, 13. winch, 14. traveling block. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0023] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0024] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0025] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0026] like Figure 1-3 As shown, a preferred embodiment of the utility model provides an adjustable crane structure, including a crane seat 1 arranged on the top of a derrick 11, a crane frame 2 arranged on the top of the crane seat 1, and a crane pulley assembly 3 arranged at both ends of the crane frame 2; in this embodiment, a preferred embodiment is that the derrick 11 is a vertical workover rig mast-type derrick.

[0027] The crane pulley assembly 3 is arranged at both ends of the crane frame 2 and is supported as a whole on the upright derrick 11. The center of the crane wellhead is extended out of the derrick 11, while ensuring that the derrick 11 structure bears the vertical downward load and avoids the derrick 11 structure from bearing bending moment, thereby ensuring that the center of the crane wellhead is aligned with the center of the wellbore at all times during operation, avoiding the phenomenon of the crane wellhead center and the wellbore center being offset due to the forward deviation of the crane when the forward-leaning workover rig mast derrick is working.

[0028] The overhead crane frame 1 is connected to the derrick 11 via a hydraulic cylinder 4, and the overhead crane is driven to flip by the hydraulic cylinder 4 to reduce the transportation height of the whole machine.

[0029] A locking pin 5 and a rotating pin 6 are arranged in parallel at the upper end of the crown block seat 2, and a locking hole 7 and a rotating shaft hole 8 are arranged at the positions corresponding to the locking pin 5 and the rotating pin 6 in the middle of the crown block frame 1, and the rotating pin 6 penetrates into the rotating shaft hole 8 so that the crown block frame 1 is rotatably connected with the derrick 11. When the crown block is working, the locking pin 5 penetrates into the locking hole 7 so that the crown block is in a locked state;

[0030] The installation form of the overhead crane can be adjusted according to the requirements of transportation and operating conditions. During operation, the overhead crane is horizontally supported on the derrick 11. Under normal working conditions, the hydraulic cylinder 4 pushes out to keep the overhead crane frame 1 horizontal, and then the locking pin 5 penetrates into the locking hole 7 to ensure that the overhead crane is in a locked state during operation. On the wellhead side of the overhead crane seat 2, the bottom of the overhead crane frame 1 fits with the surface of the overhead crane seat 2, which not only avoids the bearing of only the locking pin 5 and the rotating pin 6 during operation, but also plays a role in overturning limit.

[0031] The overhead crane pulley assembly 3 includes a winch side pulley block 31 and a wellhead side pulley block 32. The winch side pulley block 31 is composed of a three-wheel dead rope wheel 311 and a single-wheel fast rope wheel 312. The three-wheel dead rope wheel 311 and the single-wheel fast rope wheel 312 are fixed and rotated through the same overhead crane axle. The wellhead side pulley block 32 is composed of a four-wheel main pulley 321. The winch 13, the overhead crane pulley assembly 3 and the frame guide wheel 12 on the frame are used to complete the following steps: Figure 4 Due to the arrangement of the crown block pulleys and the rope threading method, when the entire vertical derrick is in working condition, the winch drives the traveling block to move through the large rope, so that the forces on both sides of the winch side pulley block 31 and the wellhead side pulley block 32 are in a balanced state. Compared with the conventional crown block, the adjustable crown block applies a more uniform load to the derrick in the working state.

[0032] Furthermore, the adjustable crane structure comprises a fixed ear plate 9 arranged on the crane frame 1, so that when the crane is in a moving state, the locking pin 5 penetrates into the fixed ear plate 9 to lock the crane.

[0033] Furthermore, the adjustable crane structure comprises a limit block 10 arranged on the crane seat 2 , so that when the crane frame 1 contacts the limit block 10 , the locking pin 5 penetrates into the fixed ear plate 9 .

[0034] In the above technical solution, before the derrick 11 is laid down, the locking pin 5 is pulled out and the hydraulic cylinder 4 is retracted, driving the crane to rotate around the rotating pin 6 and retract into the upper body of the derrick 11 from the back opening of the upper body of the derrick 11. When the crane frame 1 contacts the limit block 10 of the crane seat 2, the fixed ear plate 9 reaches the locking position, and the locking pins 5 on both sides penetrate into the fixed ear plate 9, so that the crane frame 1 is in a locked state.

[0035] Furthermore, the adjustable overhead crane structure, such as Figure 3 As shown, the pulleys in the crown block pulley assembly 3 are all arranged transversely and parallel to the crown block frame 1 to facilitate rope threading.

[0036] Furthermore, in the adjustable overhead crane structure, locking holes 7 and fixing ear plates 9 are provided on both sides of the overhead crane frame 1, and locking pins 5 are provided on both sides of the overhead crane seat 2. The number of the locking holes 7, fixing ear plates 9 and locking pins 5 is two each, thereby improving the stability of the device.

[0037] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An adjustable overhead crane structure, characterized in that: It includes a crane seat arranged on the top of the derrick, a crane frame arranged on the top of the crane seat, and a crane pulley assembly arranged at both ends of the crane frame; The crane frame is connected to the derrick through a hydraulic cylinder. A locking pin and a rotating pin are arranged in parallel on the upper end of the crane seat. A locking hole and a rotating shaft hole are arranged in the middle of the crane frame at positions corresponding to the locking pin and the rotating pin. The rotating pin is inserted into the rotating shaft hole so that the crane frame is rotatably connected to the derrick. When the crane is working, the locking pin is inserted into the locking hole so that the crane is in a locked state. The overhead crane pulley assembly comprises a winch side pulley block and a wellhead side pulley block, wherein the winch side pulley block is composed of a three-wheel dead rope pulley and a single-wheel fast rope pulley, and the wellhead side pulley block is composed of a four-wheel main pulley.

2. The adjustable overhead crane structure according to claim 1, characterized in that: It also includes a fixed ear plate arranged on the crown block frame, so that when the crown block is in a moving state, the locking pin penetrates into the fixed ear plate to lock the crown block.

3. The adjustable overhead crane structure according to claim 2, characterized in that: It also includes a limiting block arranged on the crown block, so that when the crown block frame contacts the limiting block, the locking pin penetrates into the fixed ear plate.

4. The adjustable overhead crane structure according to claim 1, characterized in that: The pulleys in the crown block pulley assembly are all arranged transversely.

5. The adjustable overhead crane structure according to claim 1, characterized in that: The two sides of the overhead crane frame are provided with locking holes and fixing ear plates, the two sides of the overhead crane seat are provided with locking pins, and the number of the locking holes, fixing ear plates and locking pins are all two.

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