Chain tension self-balancing device for chain type traveling block compensation device and using method of chain tension self-balancing device

Abstract

The invention discloses a chain tension self-balancing device and method for a chain type traveling block compensation device, an upper block body and a lower block body which are attached to each other are connected to a front main plate, the sides, opposite to the front main plate, of the upper block body and the lower block body are connected with a rear main plate, and a plurality of groups of hole channels are correspondingly and vertically formed in the upper block body and the lower block body; a chain adjusting rod penetrates through each hole channel, T-shaped pistons are arranged between each chain adjusting rod and the upper block body and between each chain adjusting rod and the lower block body in a sleeved mode, columnar cavities matched with the strokes of the T-shaped pistons are formed in the upper block body and the lower block body respectively, and a channel is formed between every two adjacent columnar cavities. Lubricating grease is injected into the columnar cavity, it can be guaranteed that the T-shaped piston moves up and down, the moving distance of the piston is the length adjusting amount of each chain, the length difference amount of each chain in the using process is counteracted through the up-down movement of the T-shaped piston, it is guaranteed that the tensioning force of each chain is consistent in magnitude, and the problems that manual adjustment wastes time and labor and is low in accuracy are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore oil drilling equipment, and relates to a chain tension self-balancing device for a chain-type traveling block compensation device. The invention also relates to a method for using the self-balancing device. Background Art

[0002] When conducting offshore oil drilling operations, it is necessary to equip a set of heave compensation devices to maintain the large hook load basically constant during the heave movement of the floating drilling platform (such as drilling ships, geological survey ships), and reduce the adverse effects of the platform heave movement on the drilling operation. The floating platform heave compensation devices mainly include the crown block drill string heave compensation device, the traveling block drill string compensation device, the dead rope / fast rope compensation device and the winch drill string compensation device. Among the drill string heave compensation devices of the floating drilling platform currently in service, the chain-type traveling block drill string heave compensation device is the most widely used.

[0003] The chain-type traveling block compensation device is installed between the traveling block and the top drive, and is mainly composed of a compensation cylinder, a sprocket assembly, a lifting chain, a main frame, a lower frame and a locking device. The compensation cylinder is arranged upright and symmetrically. The top of the compensation cylinder piston rod is connected to a sprocket assembly. The lifting chain is connected to the main frame at one end and the lower frame at the other end through the sprocket assembly. A major feature of the chain-type compensation device that makes it widely used is that the compensation stroke can reach twice the stroke of the cylinder. This design can achieve a larger compensation stroke in a smaller derrick space, and the flexible connection of the chain can greatly eliminate the adverse effects of the asynchronism of the compensation cylinder on the compensation device.

[0004] In actual use, each chain in the single-side chain bears different tension. After a period of time, the length of the chain will change according to the different forces. The different lengths of the chains on the left and right sides will cause the shortest chain to bear huge hook loads and break in advance. In the operation of the chain-type traveling block compensation device, in order to avoid the single plate chain from being overloaded and being broken in advance, it is necessary to keep the tension of the three plate chains on each side consistent. In the past, the method of keeping the chain tension equal was entirely based on manual experience. A soft wooden hammer was used to hit the chain, and the uniformity of the chain load was judged by observing the degree of chain bounce. If one of the chains was slightly loose, the nut of the chain adjustment rod could be tightened to achieve uniform chain load. This method of manually adjusting the chain tension was labor-consuming and time-consuming, with low accuracy. In addition, the compensation device was located at high altitude and was subjected to heavy loads, so the safety risk of manual adjustment was high. Therefore, it is particularly urgent to design and develop an automatic balancing device for the tension of the chain-type traveling block drill column compensation device. Summary of the invention

[0005] The purpose of the present invention is to provide a chain tension self-balancing device for a chain type traveling carriage compensation device, which solves the problem of time-consuming, labor-intensive and low-accuracy manual adjustment of the chain tensioning force in the prior art.

[0006] Another object of the present invention is to provide a method for performing tension self-balancing adjustment using the above self-balancing device.

[0007] The technical solution adopted by the present invention is that the chain tension self-balancing device includes a front main board and a rear main board, the front main board is connected with a fitting upper block and a lower block, the upper block and the lower block are connected to the rear main board on the side opposite to the front main board, the upper block and the lower block are correspondingly vertically opened with a plurality of groups of channels, each channel is respectively penetrated by a chain adjusting rod, the upper end of each chain adjusting rod is connected with a chain, and the lower end of each chain adjusting rod is connected with an adjusting nut; a T-type piston is respectively sleeved between each chain adjusting rod and the upper block and the lower block, and a columnar cavity matching the stroke of the T-type piston is respectively opened on the upper block and the lower block, the vertical part of the T-type piston is partially exposed, and a channel is opened between two adjacent columnar cavities.

[0008] The present invention is also characterized in that:

[0009] Grooves matching the front main board and the rear main board are respectively provided at both ends of the upper block and the lower block, the front main board is located in the grooves at the first ends of the upper block and the lower block, the rear main board is located in the grooves at the second ends of the upper block and the lower block, and the upper block and the lower block are respectively connected to the front main board and the rear main board through second long bolts;

[0010] The upper block and the lower block are connected by a first long bolt and a positioning pin;

[0011] The lower end of the lower block is connected with a fixed baffle plate by a fixing bolt, and the lower ends of a plurality of chain adjusting rods respectively penetrate the fixed baffle plate, and the outer diameter of the adjusting nut is larger than the through hole size at the connection between the fixed baffle plate and the chain adjusting rod;

[0012] A first sealing ring and a wear-resistant ring are provided between the horizontal part of the T-shaped piston and the upper block and the lower block;

[0013] The upper block and the lower block are respectively connected with a first baffle plate by countersunk screws near the columnar cavity. A second sealing ring is arranged between the upper block, the lower block and the vertical part of the T-shaped piston. The second sealing ring is located above the first baffle plate and fits with it. The inner ring of the second sealing ring fits with the T-shaped piston.

[0014] Each opening of the upper block is connected to a scratch plate via a first countersunk screw, and a second baffle is connected to the opening of the columnar cavity of the lower block via a second countersunk screw;

[0015] The passage outlets in the upper block and the lower block are respectively provided with plugs;

[0016] A sleeve is sleeved on the lower end of each chain adjusting rod, and the sleeve is located between the adjusting nut and the second baffle.

[0017] Another technical solution adopted by the present invention is a method for using a chain tension self-balancing device. The specific operation method is: adjust the chain tension by adjusting the nut to make the tension of each chain consistent, inject grease into the columnar cavity between the upper block and the lower block, and then tighten and lock each plug. Finally, the device will achieve self-balancing adjustment of the chain tension through the chain tension applied by the weight of the drill string and other pipe strings.

[0018] The beneficial effects of the present invention are:

[0019] The chain tension self-balancing device not only provides a channel for the chain adjusting rod and the function of the load-bearing block, but also connects the upper block and the lower block together by long bolts. It creatively uses the up and down movement of the T-shaped piston body to perform chain tension self-balancing, realizing automatic chain adjustment, saving time and effort, saving work costs, and automatic adjustment with high accuracy, avoiding the dangers of high-altitude operations during manual adjustment, saving a lot of costs, and reducing the cost of offshore drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of the installation of the chain tension self-balancing device of the present invention;

[0021] Figure 2 This is a right side view of the installation of the chain tension self-balancing device of the present invention;

[0022] Figure 3 A bottom view of the chain tension self-balancing device of the present invention;

[0023] Figure 4 It is a cross-sectional view of the hole center of the chain tension self-balancing device of the present invention;

[0024] Figure 5 is a top view of the chain tension self-balancing device of the present invention;

[0025] Figure 6 The present invention Figure 4 A partial enlarged view of point A in the middle.

[0026] In the figure, 1. upper block, 2. lower block, 3. T-type piston, 4. first baffle, 5. sleeve, 6. second baffle, 7. anti-scratch plate, 8. first sealing ring, 9. wear-resistant ring, 10. second sealing ring, 11. first long bolt, 12. seal, 13. first countersunk screw, 14. plug, 15. positioning pin, 16. chain, 17. chain adjusting rod, 18. front main board, 19. rear main board, 20. second long bolt, 21. adjusting nut, 22. fixed baffle, 23. fixing bolt, 24. second countersunk screw. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The chain tension self-balancing device comprises a front main board 18 and a rear main board 19, the front main board 18 is connected with an upper block 1 and a lower block 2 which fit together, the upper block 1 and the lower block 2 are connected with the rear main board 19 at the side opposite to the front main board 18, specifically, grooves matching the front main board 18 and the rear main board 19 are respectively provided at both ends of the upper block 1 and the lower block 2, the front main board 18 is simultaneously located in the grooves at the first ends of the upper block 1 and the lower block 2, the rear main board 19 is simultaneously located in the grooves at the second ends of the upper block 1 and the lower block 2, the upper block 1 and the lower block 2 are respectively connected with the front main board 18 and the rear main board 19 by the second long bolts 20, and the upper block 1 and the lower block 2 are first positioned by the positioning pins 15, and then fixed by the first long bolts 11;

[0029] The upper block 1 and the lower block 2 are vertically provided with a plurality of groups of channels, each channel is penetrated by a chain adjusting rod 17, the upper end of each chain adjusting rod 17 is connected to a chain 16, and the lower end of each chain adjusting rod 17 is connected to an adjusting nut 21, and the adjusting nut 21 can move up and down with the chain adjusting rod 17. The chain tension self-balancing device will no longer adjust the chain tension after roughly adjusting the chain tension up and down by adjusting the nut 21 after the first installation. The chain tension is automatically adjusted by the chain tension self-balancing device to ensure that the tension of each chain is consistent;

[0030] A T-type piston 3 is sleeved between each chain adjusting rod 17 and the upper block 1 and the lower block 2, respectively. A columnar cavity matching the stroke of the T-type piston 3 is opened on the upper block 1 and the lower block 2, and grease is injected into the annular cavity to ensure that the T-type piston 3 can move up and down. The two T-type pistons 3 on each chain adjusting rod 17 are respectively arranged in the columnar cavity of the upper block 1 and the lower block 2, and the vertical part of the T-type piston 3 is partially exposed. A first sealing ring 8 and a wear-resistant ring 9 are arranged between the horizontal part of the T-type piston 3 and the upper block 1 and the lower block 2 to ensure that the T-type piston 3 has good movement performance and sealing performance when moving up and down in the columnar cavity;

[0031] When the self-balancing device is working, when part of the chain is loose, the shortest chain is subjected to the greatest force, which will drive the chain adjusting rod 17 and the corresponding T-type piston 3 to move upward. During the upward movement, the T-type piston 3 will squeeze the grease in the columnar cavity where it is located into the relatively loose columnar cavity of the chain through the channel, and then the grease will squeeze the T-type piston 3 downward, thereby driving the corresponding chain adjusting rod 17 and chain 16 to move downward, so as to achieve the purpose of adjusting the chain balance. In the present invention, the distance that the T-type piston 3 moves up and down is the length adjustment amount of each chain 16. The up and down movement of the T-type piston 3 is used to offset the length difference of each chain 16 during use, thereby ensuring that the tensioning force of each chain 16 is consistent, thereby realizing the chain self-adjustment process.

[0032] The lower end of the lower block 2 is connected to a fixed baffle 22 by a fixing bolt 23, and the lower ends of several chain adjusting rods 17 respectively penetrate the fixed baffle 22. The outer diameter of the adjusting nut 21 is larger than the through hole size at the connection between the fixed baffle 22 and the chain adjusting rod 17, which can prevent the chain adjusting rod 17 from falling together with the chain 16. During use, a certain distance is ensured between the upper end surface of the fixed baffle 22 and the lower end surface of the adjusting nut 22 to ensure that during the tension balancing process of the chain tension self-balancing device, the chain adjusting rod 17 drives the adjusting nut 21 to move up and down without colliding and interfering with the fixed baffle 22.

[0033] The upper block 1 and the lower block 2 are connected to the first baffle 4 near the columnar cavity by countersunk screws 13 respectively. A second sealing ring 10 is provided between the upper block 1, the lower block 2 and the vertical part of the T-type piston 3. The second sealing ring 10 is located above the first baffle 4 and fits therewith. The inner ring of the second sealing ring 10 fits with the T-type piston 3. When the T-type piston 3 moves up and down, the second sealing ring 10 can ensure the sealing between the block and the T-type piston 3, and the first baffle 4 is mainly used to prevent the second sealing ring from falling off. At the same time, the first baffle 4 can also prevent the T-type piston 3 from being impacted and damaged when it moves up and down under heavy load. The first baffle 4 can be conveniently replaced in subsequent maintenance.

[0034] Each opening of the upper block 1 is connected to a scratch plate 7 via a first countersunk screw 13, and the columnar cavity opening of the lower block 2 is connected to a second baffle 6 via a second countersunk screw 24, which can prevent the chain adjusting rod 17 from scratching the upper block 1 and the lower block 2 and thus damaging the blocks.

[0035] A third sealing ring 12 is installed circumferentially in the grease passages of the upper block 1 and the lower block 2. Plugs 14 are provided at the outlets of the grease passages in the upper block 1 and the lower block 2, respectively, to ensure heavy load pressure maintenance during the operation of the chain tension self-balancing device and prevent grease from spraying out and injuring people. During the operation of the drill string compensation device, the four plugs 14 must be kept in a tightened and locked state.

[0036] Each chain adjusting rod 17 is sleeved with a sleeve 5 at its lower end. The sleeve 5 is located between the adjusting nut 21 and the second baffle 6. The sleeve 5 is mainly used to prevent the adjusting nut 21 from colliding with the lower block 2 and damaging the lower block 2 when the chain is adjusted.

[0037] A channel is opened between two adjacent columnar cavities to realize the interconnection between the adjacent columnar cavities of the upper block 1 and the lower block 2. The initial injection amount of grease determines the initial set distance between the lower end face of the sleeve 5 and the lower end face of the second baffle 6. The distance is determined according to the chain elongation of the chain tension self-balancing device, ensuring that the different chain stretching lengths on each channel of the chain tension self-balancing device correspond to the different up and down movement displacements of the T-type piston 3 on each channel, thereby performing self-balancing adjustment of the chain tension.

[0038] Example 1

[0039] Assuming that when the traveling carriage compensation device is in use, the second chain is the shortest due to the different tensions of each chain, the second chain will be subjected to the greatest force, and the second chain will drive the corresponding chain adjusting rod 17 and T-type piston 3 to move upward. During the upward movement, the T-type piston 3 will squeeze the grease in its columnar cavity through the channel into the columnar cavities corresponding to the first chain and the third chain. Subsequently, the grease in the columnar cavities corresponding to the first chain and the third chain will squeeze the T-type piston 3 downward, thereby driving the corresponding chain adjusting rod 17 and chain 16 to move downward, thereby achieving the purpose of adjusting the chain balance.

[0040] Example 2

[0041] The chain tension self-balancing device does not adjust the chain tension after the chain tension is roughly adjusted up and down by adjusting the nut 21 after the first installation. The chain tension is automatically adjusted by the chain tension self-balancing device to ensure that the tension of each chain is consistent.

[0042] A channel is opened between two adjacent columnar cavities to realize the interconnection between the adjacent columnar cavities of the upper block 1 and the lower block 2. The initial injection amount of grease determines the initial set distance between the lower end face of the sleeve 5 and the lower end face of the second baffle 6. The distance is determined according to the chain elongation of the chain tension self-balancing device, ensuring that the different chain stretching lengths on each channel of the chain tension self-balancing device correspond to the different up and down movement displacements of the T-type piston 3 on each channel, thereby performing self-balancing adjustment of the chain tension.

[0043] Example 3

[0044] When performing self-balancing tension adjustment, the chain tension is adjusted by adjusting the nut 21 to make the tension of each chain 16 consistent, grease is injected into the columnar cavity between the upper block 1 and the lower block 2, and then each plug 14 is tightened and locked. Finally, the device will realize self-balancing adjustment of the chain tension through the chain tension applied by the weight of the drill string and other pipe strings. Specifically, when the self-balancing device is working, when part of the chain is loose, the shortest chain is subjected to the greatest force, which will drive the chain adjusting rod 17 and the corresponding T-type piston 3 to move upward, and the T-type piston 3 will move upward during the upward movement. During the process, the grease in the columnar cavity where it is located will be squeezed into the relatively loose columnar cavity of the chain through the channel, and then the grease will squeeze the T-piston 3 downward, thereby driving the corresponding chain adjustment rod 17 and the chain 16 to move downward, so as to achieve the purpose of adjusting the balance of the chain. In the present invention, the distance that the T-piston 3 moves up and down is the length adjustment amount of each chain 16. The up and down movement of the T-piston 3 is used to offset the length difference of each chain 16 during use, thereby ensuring that the tensioning force of each chain 16 is consistent, and realizing the chain self-adjustment process.

[0045] The chain tension self-balancing device of the traveling carriage compensation device in the present invention is not limited to the chain-type traveling carriage compensation device. The chain tension self-balancing device is used in all equipment and facilities that require manual adjustment of the tension of multiple rows of chains.

Claims

1. A chain tension self-balancing device for a chain type traveling carriage compensation device, characterized in that: The invention comprises a front main board (18) and a rear main board (19), wherein the front main board (18) is connected with an upper block (1) and a lower block (2) which fit together, wherein the upper block (1) and the lower block (2) are connected to the rear main board (19) on the side opposite to the front main board (18), wherein the upper block (1) and the lower block (2) are respectively provided with a plurality of groups of holes vertically, wherein each hole is respectively penetrated by a chain adjusting rod (17), and the upper end of each chain adjusting rod (17) is connected to a A chain (16) is connected, and the lower end of each chain adjusting rod (17) is connected to an adjusting nut (21); a T-shaped piston (3) is respectively sleeved between each chain adjusting rod (17) and the upper block (1) and the lower block (2); the upper block (1) and the lower block (2) are respectively provided with a columnar cavity matching the stroke of the T-shaped piston (3); the vertical part of the T-shaped piston (3) is partially exposed, and a channel is provided between two adjacent columnar cavities.

2. The chain tension self-balancing device for the chain type traveling carriage compensation device according to claim 1 is characterized in that: The upper block (1) and the lower block (2) are respectively provided with grooves matching the front main board (18) and the rear main board (19) at both ends; the front main board (18) is located in the grooves at the first ends of the upper block (1) and the lower block (2); the rear main board (19) is located in the grooves at the second ends of the upper block (1) and the lower block (2); the upper block (1) and the lower block (2) are respectively connected to the front main board (18) and the rear main board (19) by second long bolts (20).

3. The chain tension self-balancing device for the chain type traveling carriage compensation device according to claim 1 is characterized in that: The upper block (1) and the lower block (2) are connected via a first long bolt (11) and a positioning pin (15).

4. The chain tension self-balancing device for a chain type traveling carriage compensation device according to claim 1, characterized in that: The lower end of the lower block (2) is connected to a fixed baffle (22) via a fixing bolt (23), the lower ends of a plurality of chain adjusting rods (17) respectively penetrate the fixed baffle (22), and the outer diameter of the adjusting nut (21) is larger than the size of the through hole at the connection between the fixed baffle (22) and the chain adjusting rod (17).

5. The chain tension self-balancing device for a chain type traveling carriage compensation device according to claim 1, characterized in that: A first sealing ring (8) and a wear-resistant ring (9) are provided between the horizontal part of the T-shaped piston (3) and the upper block (1) and the lower block (2).

6. The chain tension self-balancing device for the chain type traveling carriage compensation device according to claim 1, characterized in that: The upper block (1) and the lower block (2) are connected to the first baffle (4) near the columnar cavity by countersunk screws (13), and a second sealing ring (10) is provided between the upper block (1), the lower block (2) and the vertical part of the T-type piston (3). The second sealing ring (10) is located above the first baffle (4) and fits therewith, and the inner ring of the second sealing ring (10) fits the T-type piston (3).

7. The chain tension self-balancing device for a chain type traveling carriage compensation device according to claim 1, characterized in that: Each opening of the upper block (1) is connected to an anti-scratch plate (7) via a first countersunk screw (13), and the columnar cavity opening of the lower block (2) is connected to a second baffle (6) via a second countersunk screw (24).

8. The chain tension self-balancing device for a chain type traveling carriage compensation device according to claim 1, characterized in that: Plugs (14) are respectively provided at the channel outlets in the upper block (1) and the lower block (2).

9. The chain tension self-balancing device for a chain type traveling carriage compensation device according to claim 7, characterized in that: A sleeve (5) is sleeved on the lower end of each chain adjusting rod (17), and the sleeve (5) is located between the adjusting nut (21) and the second baffle (6).

10. The method for using the chain tension self-balancing device for a chain type traveling carriage compensation device according to any one of claims 1 to 9, characterized in that: The specific operation method is: The chain tension is adjusted by adjusting the nut (21) so that the tension of each chain (16) is consistent, grease is injected into the columnar cavity between the upper block (1) and the lower block (2), and then each plug (14) is tightened and locked. Finally, the device realizes self-balancing adjustment of the chain tension through the chain tension applied by the weight of the drill string and other pipe strings.

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