Oil pipe supporting equipment for power plant transformation

By designing an oil pipe support device with adjustment components and drive components, the problem that existing equipment cannot adapt to different terrain and oil pipe sizes is solved, and adaptive clamping of oil pipes of different scale diameters and lengths is achieved, improving the adaptability and stability of the equipment.

CN119532516APending Publication Date: 2025-02-28浙江华业电力工程股份有限公司 +1
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Patent Information

Application Number
CN202411865997.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-02-28

AI Technical Summary

Technical Problem

The existing oil pipe support equipment cannot adapt to changes in different terrain and oil pipe ruler diameters, causing oil pipes to shake, affecting equipment replacement operations, and poor clamping effect.

Method used

A oil pipe support device for power plant transformation is designed, using adjustment components and drive components, which can adjust the inclination angle of the sliding components on the mounting base and the spacing between the sliding seats, and adaptive clamping of oil pipes of different scale diameters and lengths through the drive plate and limit roller.

Benefits of technology

It improves the adaptability of the support equipment to different terrain and oil pipe sizes, reduces oil pipe shaking, enhances the stability of equipment replacement operations, and improves the clamping effect of oil pipes of different scale diameters and lengths.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses oil pipe supporting equipment for power plant transformation, and relates to the technical field of oil pipe supporting, the oil pipe supporting equipment comprises a base, a mounting seat is arranged on the top surface of the base, and the mounting seat is rotatably arranged on the top surface of the base through an adjusting assembly; two sliding seats are arranged on the top face of the mounting seat, the two sliding seats are arranged on the top faces of the sliding seats in a collinear reverse sliding mode through driving assemblies, and supporting assemblies used for supporting an oil pipe are fixedly mounted on the two sliding seats correspondingly. According to the oil pipe supporting equipment for power plant transformation, by means of a driving plate on a fixing frame, two rotating frames on a sliding seat can be driven by the driving plate to rotate relatively, and therefore limiting rollers on the two rotating frames can achieve the self-adaptive clamping effect on oil pipes with different sizes and diameters; therefore, the adaptability of the supporting equipment to different ruler diameters and different lengths is further improved.
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Description

Technical Field

[0001] The invention relates to the technical field of oil pipe support, and in particular to an oil pipe support device for power plant reconstruction. Background Art

[0002] A power plant is a power plant that converts some form of raw energy into electrical energy for fixed facilities or transportation. In order to improve the power generation efficiency of the power plant, reduce the pollution of the power plant's emissions to the environment, and improve the safety of the power plant, it is necessary to transform the power plant. During the transformation process, support equipment is needed to support the oil pipe, so as to achieve the effect of replacing the equipment in the power plant.

[0003] Due to the complexity of power plant equipment, the existing oil pipe supporting equipment is unable to support the oil pipe according to different power plant terrains. Therefore, when the supporting equipment of the prior art is used to support the oil pipe, it is easy to cause the oil pipe to shake, thus affecting the replacement operation of the equipment in the power plant (mainly due to the shaking of the supporting equipment, the position of the oil pipe is offset, so that after the equipment in the power plant is replaced, the staff needs to readjust the position of the oil pipe so that the oil pipe can be connected to the replaced power plant equipment). In addition, in the power plant, the diameter of the connected pipes will change, and the supporting equipment in the prior art can only clamp the oil pipes of the same diameter, but cannot adjust the clamping spacing of the supporting equipment according to the change in the diameter of the oil pipe. Therefore, the existing supporting equipment has problems such as low adaptability and poor clamping effect. Summary of the invention

[0004] The purpose of the present invention is to provide an oil pipe supporting device for power plant reconstruction to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an oil pipe support device for power plant reconstruction, comprising a base, a mounting seat is arranged on the top surface of the base, and the mounting seat is rotatably arranged on the top surface of the base through an adjusting component; two sliding seats are arranged on the top surface of the mounting seat, and the two sliding seats are arranged on the top surface of the sliding seat in a colinear and reverse sliding manner through a driving component, and support components for supporting the oil pipe are fixedly installed on the two sliding seats.

[0006] Furthermore, the adjustment component includes a driving rod, which is rotatably arranged on the bottom surface of the mounting seat, and a worm is fixedly mounted on the circumferential surface of the driving rod; the adjustment component also includes a fixing frame fixedly mounted on the top surface of the base, and a worm wheel matching the worm is fixedly mounted on the fixing frame.

[0007] Furthermore, the support assembly includes two fixed frames fixedly mounted on the sliding seat, and a driving plate is arranged on the fixed frame for horizontal sliding; two support frames are fixedly mounted on the sliding seat, and rotating frames are rotatably arranged on both support frames, and the two rotating frames are driven by the sliding of the driving plate to make the two rotating frames rotate relative to each other, and limiting rollers for clamping the oil pipe are rotatably installed on the top ends of the two rotating frames.

[0008] Furthermore, a rotating shaft is rotatably provided on the driving plate, and an extrusion wheel is fixedly installed on the circumferential surface of the rotating shaft; a second sliding groove is opened on the fixed frame, and an upper sliding block is slidably provided inside the second sliding groove, and the bottom surface of the upper sliding block slides and abuts against the extrusion wheel, a plurality of second springs are provided between the upper sliding block and the fixed frame, and a trapezoidal block is fixedly installed on the upper sliding block, and sliding inclined surfaces are provided on both sides of the trapezoidal block corresponding to each other.

[0009] Furthermore, a vertical slot is provided on the upper sliding block, a fixing rod is slidably provided inside the vertical slot, and the fixing rod is fixedly installed inside the second sliding slot.

[0010] Furthermore, an abutment wheel is rotatably provided at the bottom end of the rotating frame, and the abutment wheel is slidably provided on the sliding inclined plane.

[0011] Furthermore, a first sliding groove is provided on the fixed frame, a lower sliding block is slidably provided inside the first sliding groove, a top surface of the lower sliding block is slidably abutted against the extrusion wheel, and a first spring is provided between the lower sliding block and the sliding seat.

[0012] Furthermore, a connecting rail is fixedly installed on the surface of the trapezoidal block, two sliding frames are arranged on the connecting rail for horizontal sliding, a compression block is arranged on the sliding frame for vertical sliding, a third spring is arranged between the compression block and the sliding frame, and a support roller is rotatably arranged on the compression block.

[0013] In the above technical solution, the present invention provides an oil pipe support device for power plant reconstruction, which has the following beneficial effects: By utilizing the adjustment component, the inclination angle of the two sliding components on the mounting seat can be adjusted, thereby achieving the effect of adjusting the inclination angle of the support component according to the inclination angle of the oil pipe, so that the support component on the mounting plate can be suitable for oil pipes with different inclination angles, thereby improving the adaptability of the support equipment to the environment to a certain extent.

[0014] By utilizing the driving assembly, the distance between the two sliding seats can be adjusted, so that a certain gap can be left between the two sliding seats, thereby achieving the effect of supporting oil pipes of different lengths.

[0015] By utilizing the driving plate on the fixed frame, the two rotating frames on the sliding seat can rotate relative to each other under the drive of the driving plate, so that the limiting rollers on the two rotating frames can adaptively clamp oil pipes of different diameters, thereby further improving the adaptability of the supporting equipment to different diameters and lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 The embodiment of the present invention provides Figure 1 A schematic cross-sectional structure diagram of ; Figure 3 The embodiment of the present invention provides Figure 3 The structural diagram at A in the middle; Figure 4 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 5 The embodiment of the present invention provides Figure 4 Schematic diagram of the partially disassembled structure; Figure 6 The embodiment of the present invention provides Figure 5 Schematic diagram of the local structure; Figure 7 The embodiment of the present invention provides Figure 6 Schematic diagram of the partially disassembled structure; Figure 8 The embodiment of the present invention provides Figure 7 Schematic diagram of the partially disassembled structure; Fig. 9 The embodiment of the present invention provides Figure 8 Schematic diagram of the structure at B in the figure.

[0018] Description of reference numerals: 1. Base; 2. Mounting seat; 3. Adjustment assembly; 31. Drive rod; 32. Worm; 33. Worm gear; 34. Guide plate; 35. Guide block; 4. Sliding seat; 501. Fixed frame; 5011. First slide slot; 5012. Second slide slot; 502. Drive plate; 503. Rotating shaft; 504. Extrusion wheel; 505. Lower slider; 506. First spring; 507. Upper slider; 508. Connecting plate; 509. Second spring; 510. Fixed rod; 511. Vertical slot; 512. Trapezoidal block; 513. Sliding inclined plane; 514. Support frame; 515. Rotating rod; 516. Rotating frame; 517. Abutting wheel; 518. Limiting roller; 519. Connecting rail; 520. Sliding frame; 521. Compression block; 522. Third spring; 523. Support roller; 534. Limiting rod. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] See also Figure 1-9 An oil pipe supporting device for power plant reconstruction provided by an embodiment of the present invention includes a base 1, a mounting seat 2 is arranged on the top surface of the base 1, and the mounting seat 2 is rotatably arranged on the top surface of the base 1 through an adjusting component 3.

[0021] Furthermore, the adjustment component 3 includes a driving rod 31, which is rotatably arranged on the bottom surface of the mounting seat 2, and a worm 32 is fixedly installed on the circumferential surface of the driving rod 31; the adjustment component 3 also includes a fixing frame fixedly installed on the top surface of the base 1, and a worm wheel 33 matching the worm 32 is fixedly installed on the fixing frame.

[0022] Furthermore, a guide plate 34 is fixedly mounted on the fixing frame, an arc-shaped guide groove is formed on the guide plate 34 , a guide block 35 is slidably disposed inside the arc-shaped guide groove, and the guide block 35 is fixedly mounted on the mounting seat 2 .

[0023] In the above technical scheme, by utilizing the driving rod 31 on the mounting seat 2, the worm 32 can be rotated under the action of the driving rod 31. Therefore, by utilizing the mutual cooperation between the worm 32 and the worm wheel 33, the mounting seat 2 can be rotated relative to the base 1, thereby achieving the effect of adjusting the inclination angle of the mounting seat 2; and by utilizing the arc-shaped guide groove on the fixed frame and the guide block 35 on the mounting plate, the effect of limiting the inclination angle of the mounting plate is achieved; therefore, by utilizing the adjustment component 3, the effect of adjusting the inclination angle of the two sliding components on the mounting seat 2 is achieved, thereby achieving the effect of adjusting the inclination angle of the support component according to the inclination angle of the oil pipe, so that the support component on the mounting plate can be suitable for oil pipes with different inclination angles, thereby improving the adaptability of the support equipment to the environment to a certain extent.

[0024] Specifically, two sliding seats 4 are arranged on the top surface of the mounting seat 2 , and the two sliding seats 4 are arranged on the top surface of the sliding seat 4 in a colinear and counter-sliding manner through a driving assembly.

[0025] In the above technical solution, by utilizing the driving assembly, the distance between the two sliding seats 4 can be adjusted, so that a certain gap can be left between the two sliding seats 4, thereby achieving the effect of supporting oil pipes of different lengths.

[0026] Specifically, a motor is fixedly mounted on the mounting seat 2, a screw is fixedly mounted on the output end of the motor, the screw is rotatably arranged on the mounting seat 2, a circumferential surface of the screw is provided with threaded sections with opposite rotation directions at both ends, and two sliding seats 4 are respectively threadedly connected to the two threaded sections.

[0027] In the above technical solution, the rotation of the screw is controlled by a motor, so that the sliding seats 4 on the two threaded segments can slide in the same line and in opposite directions along the axial direction of the screw, thereby adaptively adjusting the distance between the two support assemblies, so that the support assemblies can be suitable for oil pipes of different lengths.

[0028] As another preferred technical solution of this embodiment, a motor is fixedly mounted on the mounting seat 2, a gear is fixedly mounted on the output end of the motor, the gear is rotatably set on the mounting seat 2, racks meshing with the gears are fixedly mounted on the bottom surfaces of the two sliding seats 4, and the two racks are located on both sides of the gears, and the racks are slidably set on the mounting seat 2.

[0029] In the above technical solution, the rotation of the gear is controlled by a motor, thereby driving the two racks to slide, and then driving the two sliding seats 4 to move in opposite directions. In this way, the distance between the two support assemblies can be adaptively adjusted, so that the support assemblies can be suitable for oil pipes of different lengths.

[0030] Specifically, support components for supporting the oil pipe are fixedly mounted on the two sliding seats 4 .

[0031] In the above technical solution, by utilizing the driving plate 502 on the fixed frame 501, the two rotating frames 516 on the sliding seat 4 can rotate relative to each other under the drive of the driving plate 502, so that the limiting rollers 518 on the two rotating frames 516 can adaptively clamp oil pipes of different diameters, thereby further improving the adaptability of the supporting equipment to different diameters and lengths.

[0032] Specifically, the support assembly includes two fixed frames 501 fixedly mounted on the sliding seat 4, and a driving plate 502 is arranged on the fixed frame 501 for horizontal sliding; two support frames 514 are fixedly mounted on the sliding seat 4, and a rotating rod 515 is rotatably arranged on the two support frames 514, and a rotating frame 516 is fixedly mounted on the circumference of the two rotating rods 515, and the two rotating frames 516 are driven by the driving plate 502 for sliding so that the two rotating frames 516 can rotate relative to each other, and the top ends of the two rotating frames 516 are rotatably mounted with a limiting roller 518 for clamping the oil pipe.

[0033] Furthermore, a rotating shaft 503 is rotatably provided on the driving plate 502, and an extrusion wheel 504 is fixedly installed on the circumferential surface of the rotating shaft 503; a second sliding groove 5012 is opened on the fixed frame 501, and an upper slider 507 is slidably provided inside the second sliding groove 5012, and the bottom surface of the upper slider 507 slides and abuts against the extrusion wheel 504, a plurality of second springs 509 are provided between the upper slider 507 and the fixed frame 501, and a trapezoidal block 512 is fixedly installed on the upper slider 507, and sliding inclined surfaces 513 are provided on both sides of the trapezoidal block 512 corresponding to each other.

[0034] Furthermore, an abutment wheel 517 is rotatably provided at the bottom end of the rotating frame 516 , and the abutment wheel 517 is slidably provided on the sliding inclined surface 513 .

[0035] In the above technical solution, the driving plate 502 is utilized so that the driving plate 502 can slide laterally along the fixed frame 501. Therefore, by utilizing the extrusion wheel 504 on the driving plate 502, the upper slider 507 in the second slide groove 5012 can be driven to slide upward, thereby enabling the abutment wheels 517 on the bottom ends of the two rotating frames 516 to slide along the sliding slope 513 of the trapezoidal block 512. By sliding the abutment block, the rotating frames 516 are abutted, thereby enabling the two rotating frames 516 to rotate around the rotating rod 515 in a direction close to each other, thereby enabling the limiting rollers 518 on the two rotating frames 516 to clamp the oil pipe.

[0036] Specifically, a connecting plate 508 is fixedly installed on the top surface of the upper sliding block 507 , and two ends of the second spring 509 are fixedly connected to the fixing frame 501 and the connecting plate 508 , respectively.

[0037] In the above technical solution, by utilizing the second spring 509, when the driving plate 502 on the fixed frame 501 is sliding, with the help of the squeezing wheel 504 on the driving plate 502, the upper slider 507 can overcome the elastic force of the second spring 509, so that the upper slider 507 can slide upward along the second slide groove 5012 on the fixed frame 501 under the contact of the squeezing wheel 504, so that the two rotating frames 516 can rotate in a direction close to each other, and then the oil pipe can be clamped and limited with the help of the limiting roller 518 on the rotating frame 516.

[0038] Specifically, a tension spring is disposed on the fixed frame, and two ends of the tension spring are rotatably connected to the bottom ends of the two rotating frames 516 respectively.

[0039] In the above technical solution, by utilizing a tension spring, when the extrusion wheel 504 on the driving plate 502 drives the upper slider 507 to slide downward with the help of the elastic force of the second spring 509, the tension spring on the fixed frame can pull the bottom ends of the two rotating frames 516, thereby achieving the effect of enabling the two rotating frames 516 to be quickly opened.

[0040] Specifically, a vertical groove 511 is formed on the upper sliding block 507 , and a fixing rod 510 is slidably disposed inside the vertical groove 511 . The fixing rod 510 is fixedly installed inside the second sliding groove 5012 .

[0041] In the above technical solution, by utilizing the vertical groove 511 provided on the slider and the fixing rod 510 inside the second slide groove 5012 , the sliding direction and the sliding distance of the upper slider 507 can be limited.

[0042] Specifically, a first slide groove 5011 is provided on the fixed frame 501 , a lower slider 505 is slidably provided inside the first slide groove 5011 , the top surface of the lower slider 505 slides against the extrusion wheel 504 , and a first spring 506 is provided between the lower slider 505 and the sliding seat 4 .

[0043] In the above technical solution, by utilizing the lower slider 505 and the first spring 506 in the first slide groove 5011 , it is possible to provide power to the sliding of the upper slider 507 intermittently.

[0044] Specifically, a connecting rail 519 is fixedly installed on the surface of the trapezoidal block 512, two sliding frames 520 are horizontally slidably arranged on the connecting rail 519, a compression block 521 is vertically slidably arranged on the sliding frame 520, a third spring 522 is arranged between the compression block 521 and the sliding frame 520, and a support roller 523 is rotatably arranged on the compression block 521.

[0045] Specifically, a limiting rod 534 is slidably inserted into the sliding frame 520 , the top end of the limiting rod 534 is fixedly mounted on the bottom surface of the compression block 521 , and the third spring 522 is sleeved on the limiting rod 534 .

[0046] In the above technical solution, by utilizing the two sliding frames 520 on the connecting rail 519, the distance between the two sliding frames 520 can be adjusted for oil pipes of different diameters, so that the oil pipe can be limited between the two support rollers 523, thereby preventing the oil pipe from shaking, thereby further improving the limiting effect of the oil pipe.

[0047] Working principle: before using the support assembly to support the oil pipe, according to the inclination angle of the oil pipe, the worm 32 can be rotated under the action of the driving rod 31 by using the driving rod 31 on the mounting seat 2, so that the mounting seat 2 can be rotated relative to the base 1 by using the mutual cooperation between the worm 32 and the worm wheel 33, thereby achieving the effect of being able to adjust the inclination angle of the mounting seat 2; and by using the arc-shaped guide groove on the fixing frame and the guide block 35 on the mounting plate, the inclination angle of the mounting plate can be limited, so that the mounting plate can be adjusted to a suitable inclination angle; Then, the motor is used to control the rotation of the screw, so that the sliding seats 4 on the two threaded segments can slide in the same line in the opposite direction along the axial direction of the screw, or the motor is used to control the rotation of the gear, so as to drive the two racks to slide, thereby driving the two sliding seats 4 to move in opposite directions to each other, so as to achieve the adaptive adjustment of the distance between the two support assemblies, so that the support assemblies can be suitable for oil pipes of different lengths; By utilizing the driving plate 502, the driving plate 502 can slide laterally along the fixed frame 501. Therefore, by utilizing the squeezing wheel 504 on the driving plate 502, the upper slider 507 in the second slide groove 5012 can be driven to slide upward, thereby enabling the abutting wheels 517 on the bottom ends of the two rotating frames 516 to slide along the sliding inclined surface 513 of the trapezoidal block 512. By utilizing the sliding of the abutting block, the rotating frames 516 are abutted, thereby enabling the two rotating frames 516 to rotate around the rotating rod 515 in a direction close to each other, thereby enabling the limiting rollers 518 on the two rotating frames 516 to clamp the oil pipe. And by utilizing the second spring 509, when the driving plate 502 on the fixed frame 501 slides, The squeezing wheel 504 on the driving plate 502 enables the upper slider 507 to overcome the elastic force of the second spring 509, so that the upper slider 507 can slide upwards along the second slide groove 5012 on the fixed frame 501 under the contact of the squeezing wheel 504, so that the two rotating frames 516 can rotate in the direction of approaching each other, and then use the limiting roller 518 on the rotating frame 516 to clamp and limit the oil pipe; and in order to improve the supporting effect on the oil pipe, by utilizing the two sliding frames 520 on the connecting rail 519, it is possible to adjust the distance between the two sliding frames 520 according to the oil pipes of different diameters, so that the oil pipe can be limited between the two supporting rollers 523, thereby preventing the oil pipe from shaking, and further improving the limiting effect on the oil pipe.

[0048] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An oil pipe support device for power plant reconstruction, comprising a base (1), characterized in that: A mounting seat (2) is arranged on the top surface of the base (1); the mounting seat (2) is rotatably arranged on the top surface of the base (1) via an adjustment component (3); Two sliding seats (4) are arranged on the top surface of the mounting seat (2); the two sliding seats (4) are arranged on the top surface of the sliding seat (4) in a colinear and counter-sliding manner via a driving assembly; and support assemblies for supporting the oil pipe are fixedly mounted on the two sliding seats (4).

2. The oil pipe support device for power plant reconstruction according to claim 1 is characterized in that: The adjustment assembly (3) comprises a driving rod (31), the driving rod (31) being rotatably arranged on the bottom surface of the mounting seat (2), and a worm (32) being fixedly mounted on the circumference of the driving rod (31); The adjustment assembly (3) further comprises a fixing frame fixedly mounted on the top surface of the base (1), and a worm wheel (33) matching the worm (32) is fixedly mounted on the fixing frame.

3. The oil pipe support device for power plant reconstruction according to claim 1 is characterized in that: The support assembly comprises two fixed frames (501) fixedly mounted on the sliding seat (4), and a driving plate (502) is arranged on the fixed frame (501) for transverse sliding. Two support frames (514) are fixedly mounted on the sliding seat (4), and rotating frames (516) are rotatably mounted on the two support frames (514). The two rotating frames (516) are driven by the driving plate (502) to slide so that the two rotating frames (516) rotate relative to each other, and limiting rollers (518) for clamping the oil pipe are rotatably mounted on the top ends of the two rotating frames (516).

4. The oil pipe support device for power plant reconstruction according to claim 3 is characterized in that: A rotating shaft (503) is rotatably arranged on the driving plate (502), and an extrusion wheel (504) is fixedly mounted on the circumference of the rotating shaft (503); The fixed frame (501) is provided with a second sliding groove (5012), an upper sliding block (507) is slidably arranged inside the second sliding groove (5012), the bottom surface of the upper sliding block (507) is slidably abutted against the extrusion wheel (504), a plurality of second springs (509) are arranged between the upper sliding block (507) and the fixed frame (501), and a trapezoidal block (512) is fixedly mounted on the upper sliding block (507), and sliding inclined surfaces (513) are arranged on two sides of the trapezoidal block (512) corresponding to each other.

5. The oil pipe support device for power plant reconstruction according to claim 4 is characterized in that: The upper sliding block (507) is provided with a vertical groove (511), a fixing rod (510) is slidably arranged inside the vertical groove (511), and the fixing rod (510) is fixedly installed inside the second sliding groove (5012).

6. The oil pipe support device for power plant reconstruction according to claim 4 is characterized in that: An abutment wheel (517) is rotatably provided at the bottom end of the rotating frame (516), and the abutment wheel (517) is slidably provided on the sliding inclined surface (513).

7. The oil pipe support device for power plant reconstruction according to claim 4 is characterized in that: The fixed frame (501) is also provided with a first sliding groove (5011), a lower sliding block (505) is slidably arranged inside the first sliding groove (5011), the top surface of the lower sliding block (505) is slidably abutted against the extrusion wheel (504), and a first spring (506) is arranged between the lower sliding block (505) and the sliding seat (4).

8. The oil pipe support device for power plant reconstruction according to claim 4 is characterized in that: A connecting rail (519) is fixedly mounted on the surface of the trapezoidal block (512); two sliding frames (520) are horizontally slidably arranged on the connecting rail (519); a compression block (521) is vertically slidably arranged on the sliding frame (520); a third spring (522) is arranged between the compression block (521) and the sliding frame (520); and a supporting roller (523) is rotatably arranged on the compression block (521).