Supporting and positioning device used when power station valve is communicated with pipeline

Abstract

The utility model discloses a supporting and positioning device used when a power station valve communicates with a pipeline, belongs to the technical field of power station valve installation, and aims to solve the problems that a supporting and positioning device used when the power station valve communicates with the pipeline is tedious in adjusting mode or large in occupied space and depends on rollers of a trolley as a pressure bearing structure, so that the service life of wheels is shortened; the device comprises a supporting plate, a pushing handle, two lifting bracket units and four universal wheels, and further comprises a distance adjusting unit and two bottom supporting units, the two lifting bracket units are both in sliding connection with the supporting plate, the distance adjusting unit is arranged between the two lifting bracket units, and the distance adjusting unit is arranged between the two lifting bracket units. The two bottom supporting units are symmetrically arranged at the top of the supporting plate along the center line in the length direction of the supporting plate, and the supporting part of each bottom supporting unit penetrates through the supporting plate and extends to the position below the supporting plate. The temporary supporting and positioning device is mainly used when a power station valve is connected with a pipeline.

Description

Technical Field

[0001] This utility model belongs to the field of power plant valve installation technology, specifically relating to a support and positioning device used when a power plant valve is connected to a pipeline. Background Technology

[0002] Power plant valves are large valves used in high-temperature and high-pressure conditions. During installation, hoisting equipment and support / positioning devices are typically required. The installation process usually involves first laying out the pipelines on both sides of the valve, leaving space for its installation. The valve is then transported to the target area using hoisting equipment and secured with bolts and nuts. While hoisting equipment can move the valve up and down, the accuracy and stability of the valve's connection to the pipeline cannot be fully guaranteed by hoisting equipment alone. Therefore, a support / positioning structure is needed at the bottom of the valve to assist the hoisting structure in supporting and positioning it. Currently, commonly used support / positioning structures rely on lifting brackets and trolleys as temporary supports during valve installation, with the lifting brackets used to fine-tune the valve's longitudinal working position. To ensure the accuracy of the valve installation position and the stability of the valve installation process, the existing support and positioning structure has two problems. First, the working position of each lifting bracket in the existing support and positioning structure is independently adjustable. If a manual adjustment structure is used, the original position needs to be unlocked, adjusted, and then fixed, which is quite cumbersome. If automatic control adjustment is used, the drive structure occupies a lot of space, which is difficult to meet the requirements of some working environments. Second, the rollers of the trolley are usually used as the pressure-bearing structure when performing support work, which leads to severe pressure on the wheel body and a significant reduction in service life. If the wheel fails during support work, it can easily cause a major safety accident. Therefore, in order to overcome the above two drawbacks, it is very necessary to develop a support and positioning device for use when power plant valves are connected to pipelines. Utility Model Content

[0003] This utility model aims to solve the problems of cumbersome adjustment methods or large space occupation of the support and positioning device used when connecting power plant valves and pipelines, as well as the problems of relying on the rollers of the trolley as the pressure-bearing structure, which leads to a reduction in the service life of the wheels and is prone to safety accidents. Therefore, it provides a support and positioning device for connecting power plant valves and pipelines.

[0004] A support and positioning device for use when a power plant valve is connected to a pipeline. The support and positioning device includes a support plate, a pusher, two lifting bracket units and four casters. The four casters are respectively located at the four corners of the bottom of the support plate, and each caster is detachably connected to the support plate. The pusher is located on one side of the support plate and is fixedly connected to the support plate. The two lifting bracket units are symmetrically arranged on the top of the support plate along the center line of the width direction of the support plate.

[0005] The support positioning device also includes a spacing adjustment unit and two bottom support units. Both lifting bracket units are slidably connected to the support plate. The spacing adjustment unit is located between the two lifting bracket units, and the fixing part of the spacing adjustment unit is detachably connected to the top of the support plate. The two adjusting parts of the spacing adjustment unit are detachably connected to one lifting bracket unit respectively. The two bottom support units are symmetrically arranged on the top of the support plate along the center line of the length direction of the support plate. The fixing part of each bottom support unit is embedded in the support plate and detachably connected to the support plate. The support part of each bottom support unit passes through the support plate and extends to the bottom of the support plate.

[0006] Furthermore, the top of the support plate is machined with a guide groove for sliding connection with the lifting bracket unit, the top of the support plate is machined with a stepped hole for positioning connection with the bottom support unit, and the top of the support plate is machined with a set of connecting holes for positioning connection with the caster wheel.

[0007] Furthermore, the lifting bracket unit includes a bottom slide, the bottom of which is provided with a guide column that cooperates with the guide groove, and the top of the bottom slide is provided with a lifting hydraulic cylinder for adjusting the working height of the top support. The top support is installed at the piston rod end of the lifting hydraulic cylinder through a top connecting plate. The top support is used to support the power station valve.

[0008] Furthermore, the bottom support unit includes a support hydraulic cylinder, which is inverted on the support plate and detachably connected to the support plate via a fixed seat. The piston rod end of the support hydraulic cylinder passes through the fixed seat and the support plate in sequence and is detachably connected to the bottom contact plate located below the support plate.

[0009] Furthermore, the spacing adjustment unit includes a double-rotating screw sleeve, which is disposed between two lifting bracket units and fixed to the support plate by a mounting base. The double-rotating screw sleeve is rotatably connected to the mounting base. A forward-rotating screw and a reverse-rotating screw are inserted into the double-rotating screw sleeve, and the double-rotating screw sleeve is threadedly connected to both the forward-rotating screw and the reverse-rotating screw. The forward-rotating screw and the reverse-rotating screw are detachably connected to one lifting bracket unit respectively. By rotating the double-rotating screw sleeve in the forward or reverse direction, the forward-rotating screw and the reverse-rotating screw are brought closer to each other or moved further away from each other, thereby adjusting the spacing between the two lifting bracket units.

[0010] Furthermore, a hexagonal nut is fitted on the outer circumference of each end of the double-threaded sleeve, and both hexagonal nuts are fixedly connected to the double-threaded sleeve.

[0011] Furthermore, the top support is a V-shaped block;

[0012] Furthermore, the top support section is a three-point clamping mechanism;

[0013] The beneficial effects of this application compared to the prior art are:

[0014] This application provides a support and positioning device for connecting power plant valves and pipelines. Compared with existing support and positioning structures, it adds a spacing adjustment unit. The spacing adjustment unit is formed by the threaded engagement between a double-rotating threaded sleeve and a forward-rotating screw and a reverse-rotating screw. When the double-rotating threaded sleeve is manually rotated forward or reverse, the forward-rotating screw and the reverse-rotating screw will move synchronously inward or outward within the threaded sleeve, thereby achieving the purpose of adjusting the spacing between the two lifting brackets. The spacing adjustment unit provided in this application also adjusts the spacing of the lifting brackets manually. Unlike the existing manual adjustment method that requires adjusting the working position of each lifting bracket one by one, this application can adjust the working position of the two lifting brackets simultaneously. Moreover, relying on the self-locking property between the threaded sleeve and the screw, it is not necessary to fix the position of the lifting brackets individually, which greatly improves the adjustment efficiency. At the same time, compared with the automatic adjustment structure, the spacing adjustment unit provided in this application has a simpler structure, occupies less space, and is more suitable for use with mobile support devices.

[0015] This application provides a support and positioning device for use when a power plant valve is connected to a pipeline. Compared with the existing support and positioning structure, it adds a bottom support unit. The bottom support unit only works when the support and positioning device is performing support work. It uses two hydraulic cylinders to replace the trolley rollers as pressure-bearing components to bear the weight of the valve. When the bottom support unit is working, the trolley wheels will separate from the ground and no longer bear the working pressure. This helps to improve the service life of the trolley wheel structure and also reduces the probability of safety accidents. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the positioning support structure described in this application;

[0017] Figure 2 This is a front view schematic diagram of the positioning support structure described in this application supporting the power plant valve;

[0018] Figure 3 This is a side view of the positioning support structure described in this application supporting the power plant valve.

[0019] Figure 4 This is a schematic diagram of the positioning support structure described in this application;

[0020] Figure 5 This is a schematic diagram of the support plate in the positioning support structure described in this application;

[0021] Figure 6 This is a front view of the lifting bracket unit in the positioning support structure described in this application (the top support part is a V-shaped block).

[0022] Figure 7 This is a side view of the lifting bracket unit in the positioning support structure described in this application (the top support part is a V-shaped block).

[0023] Figure 8 This is a schematic diagram of the operation of the lifting bracket unit in the positioning support structure described in this application (the top support part is a V-shaped block).

[0024] Figure 9 This is a front view of the lifting bracket unit in the positioning support structure described in this application (the top support part is a clamping mechanism).

[0025] Figure 10 This is a side view of the lifting bracket unit in the positioning support structure described in this application (the top support part is a clamping mechanism).

[0026] Figure 11 This is a front view of the top support portion of the positioning support structure described in this application (the top support portion is a clamping mechanism).

[0027] Figure 12 This is a schematic diagram of the operation of the lifting bracket unit in the positioning support structure described in this application (the top support part is a clamping mechanism).

[0028] Figure 13 This is a front view schematic diagram of the bottom support unit in the positioning support structure described in this application;

[0029] Figure 14 This is a front view schematic diagram of the spacing adjustment unit in the positioning support structure described in this application.

[0030] Figure 15 This is an overall schematic diagram of the positioning support structure described in this application;

[0031] Figure 16 This is a schematic diagram of the positioning support structure described in this application.

[0032] The diagram shows: 1. Support plate, 11. Guide groove, 12. Stepped hole, 13. Threaded blind hole, 14. Connecting hole group, 2. Lifting bracket unit, 21. Bottom slide, 211. Guide column, 22. Lifting hydraulic cylinder, 23. Top connecting plate, 24. Top support part, 241. Fixing block, 242. Hinge seat, 243. Clamping arm, 244. Screw mounting seat, 245. Middle support point, 3. Bottom support unit, 31. Support hydraulic cylinder, 32. Fixing seat, 33. Bottom contact plate, 4. Spacing adjustment unit, 41. Mounting seat, 42. Double-rotating threaded sleeve, 43. Forward-rotating screw, 44. Reverse-rotating screw, 45. Connecting sleeve, 46. Connecting seat, 5. Universal wheel, 6. Push handle, 7. Power station valve, 8. Oil tank, 9. Oil pump, and 10. Battery box. Detailed Implementation

[0033] Combination Figures 1 to 16 This embodiment describes a support and positioning device used when a power plant valve is connected to a pipeline. The support and positioning device includes a support plate 1, a pusher 6, two lifting bracket units 2, and four casters 5. The four casters 5 are respectively located at the four corners of the bottom of the support plate 1, and each caster 5 is detachably connected to the support plate 1. The pusher 6 is located on one side of the support plate 1 and is fixedly connected to the support plate 1. The two lifting bracket units 2 are symmetrically arranged on the top of the support plate 1 along the center line of the width direction of the support plate 1.

[0034] The support positioning device also includes a spacing adjustment unit 4 and two bottom support units 3. Both lifting bracket units 2 are slidably connected to the support plate 1. The spacing adjustment unit 4 is located between the two lifting bracket units 2, and the fixing part of the spacing adjustment unit 4 is detachably connected to the top of the support plate 1. The two adjusting parts of the spacing adjustment unit 4 are detachably connected to one lifting bracket unit 2 respectively. The two bottom support units 3 are symmetrically arranged on the top of the support plate 1 along the center line of the length direction of the support plate 1, and the fixing part of each bottom support unit 3 is embedded in the support plate 1 and detachably connected to the support plate 1. The supporting part of each bottom support unit 3 passes through the support plate 1 and extends to the bottom of the support plate 1.

[0035] Combination Figures 1 to 16 This embodiment further defines the support plate 1 in Specific Embodiment 1. Two guide grooves 11 are symmetrically machined on the top of the support plate 1 along its width direction, with the length extension direction of each guide groove 11 being the same as the width extension direction of the support plate 1. Two stepped holes 12 are symmetrically machined on the top of the support plate 1 along its length direction. The larger diameter end of each stepped hole 12 communicates with the top of the support plate 1, and the smaller diameter end communicates with the bottom of the support plate 1. Multiple threaded blind holes 13 are equidistantly machined circumferentially at the step of each stepped hole 12. A connecting hole group 14 is machined at each of the four corners of the bottom of the support plate 1, and each connecting hole group includes at least two connecting holes. Each lifting bracket unit 2 has a corresponding guide groove 11 at its bottom, which is slidably connected to the support plate 1. The fixing part of each bottom support unit 3 is embedded in the large-diameter section of a stepped hole 12 and is detachably connected to the support plate 1 via bolts and threaded blind holes 13. The supporting part of each bottom support unit 3 passes through the small-diameter section of the stepped hole 12 and extends to the bottom of the support plate 1. Each caster wheel 5 is located below a connecting hole group 14. A connecting threaded hole group is machined on the top connecting plate of each caster wheel 5, including at least two connecting threaded holes, each coaxially corresponding to a connecting through hole. Each caster wheel 5 is detachably connected to the support plate 1 via multiple bolts. Other components and connection methods are the same as in Specific Embodiment 1.

[0036] Combination Figures 1 to 16 This embodiment further defines the lifting bracket unit 2 in Specific Embodiment Two. The lifting bracket unit 2 includes a bottom slide 21, a lifting hydraulic cylinder 22, a top connecting plate 23, and a top support 24. The bottom slide 21 is disposed on top of the support plate 1. The bottom of the bottom slide 21 is provided with a guide post 211 that cooperates with the guide groove 11. The bottom slide 21 is slidably connected to the support plate 1 through the cooperation of the guide post 211 and the guide groove 11. The lifting hydraulic cylinder 22 is vertically erected on top of the bottom slide 21, and the bottom of the cylinder body of the lifting hydraulic cylinder 22 is detachably connected to the top of the bottom slide 21 by bolts. The top connecting plate 23 is disposed at the end of the piston rod in the lifting hydraulic cylinder 22 and is detachably connected to the piston rod of the lifting hydraulic cylinder 22 by bolts. The top support 24... The top support 24 is mounted on the top connecting plate 23 and is detachably connected to the top connecting plate 23 by bolts. The lifting hydraulic cylinder 22 is the main adjusting component for adjusting the working position of the top support 24. By extending or retracting the piston rod in the lifting hydraulic cylinder 22, the top support 24 is driven to rise or fall synchronously. The top support 24 is a component used to support the connecting flange portion of the power station valve 7. The support and positioning device provided in this application supports both ends of the power station valve 7 through two lifting bracket units 2, ensuring the stability of the power station valve 7 during installation. At the same time, the longitudinal fine adjustment of the power station valve 7 driven by the lifting bracket units 2 can make the flange in the power station valve 7 correspond more accurately with the flange on the connecting pipe, which also helps to reduce the difficulty of the subsequent arrangement of the sealing gasket between the power station valve 7 and the connecting pipe. Other components and connection methods are the same as in specific embodiment two.

[0037] Combination Figures 1 to 16 This embodiment further defines the top support 24 in Specific Embodiment Three. The top support 24 is a V-shaped block with a two-point support structure. A rubber pad is attached to one side of the contact surface between the V-shaped block and the power station valve 7 to prevent rigid contact from damaging the flange surface of the power station valve 7. Other components and connection methods are the same as in Specific Embodiment Three.

[0038] Combination Figures 1 to 16This embodiment further defines the top support 24 in Specific Embodiment Three. The top support 24 is a clamping mechanism, including a fixing block 241. The fixing block 241 is detachably connected to the top connecting plate 23 by bolts. A hinge seat 242 is fixed to each of the two ends of the top of the fixing block 241. Each hinge seat 242 has a clamping arm 243. One end of each clamping arm 243 is hinged to the hinge seat 242 by a torsion spring. Under normal conditions, both clamping arms 243 tend to swing outward from the fixing block 241. Two threaded blind holes are machined at the center of the top of the fixing block 241, and a screw mounting seat is provided in each threaded blind hole. 244. The bottom end of the screw mounting base 244 is inserted into the threaded blind hole at the top of the fixing block 241 and threadedly connected to the fixing block 241. The screw mounting base 244 is provided with a central support point 245. The central support point 245 includes a rubber wheel and a rubber wheel seat. The rubber wheel seat is sleeved on the screw mounting base 244 and is damped and rotatably connected to the screw mounting base 244. The rubber wheel is disposed in the rubber wheel seat and is rotatably connected to the rubber wheel seat. The two central support points 245 and the two clamping arms 243 cooperate to form a multi-point support structure. The bottom of the power station valve is longitudinally supported by the two central support points 245, and the side of the power station valve is limited by the force of the torsion springs of the two clamping arms 243. Other components and connection methods are the same as in specific embodiment three.

[0039] Combination Figures 1 to 16This embodiment further defines the bottom support unit 3 in Specific Embodiment Two. The bottom support unit 3 includes a supporting hydraulic cylinder 31, a fixed seat 32, and a bottom contact plate 33. The fixed seat 32 is embedded in the large-diameter section of the corresponding stepped hole 12 and is detachably connected to the support plate 1 through bolts and threaded blind holes 13. The supporting hydraulic cylinder 31 is inverted in the fixed seat 32, and the cylinder body of the supporting hydraulic cylinder 31 is welded and fixed to the fixed seat 32. The piston rod end of the supporting hydraulic cylinder 31 passes through the small-diameter section of the stepped hole 12 and extends to the bottom of the support plate 1. The bottom contact plate 33 is disposed at the piston rod end of the supporting hydraulic cylinder 31 and is bolted to the piston rod of the supporting hydraulic cylinder 31. For disassembly and connection, the piston rod end of the supporting hydraulic cylinder 31 is machined with a threaded blind hole, and the bottom center of the bottom contact plate 33 is machined with a stepped through hole. The threaded end of the bolt passes through the stepped through hole at the bottom of the bottom contact plate 33 and is placed in the threaded blind hole at the end of the piston rod in the supporting hydraulic cylinder 31, and is threadedly connected to the piston rod in the supporting hydraulic cylinder 31. It is worth noting that the bolt head is embedded in the bottom contact plate 33 during installation to ensure that the bottom end face of the bottom contact plate 33 does not protrude, thereby increasing the contact area with the ground and improving the stability of subsequent support. A layer of annular rubber pad is attached to the top of the bottom contact plate 33 circumferentially, and the annular rubber pad contacts the support plate 1 to avoid rigid contact that could cause deformation of the workpiece. Other components and connection methods are the same as in specific embodiment two.

[0040] Combination Figures 1 to 16This embodiment further defines the spacing adjustment unit 4 in Specific Embodiment Two. The spacing adjustment unit 4 includes a mounting base 41, a double-rotating threaded sleeve 42, a forward-rotating screw 43, a reverse-rotating screw 44, two connecting sleeves 45, and two connecting seats 46. The double-rotating threaded sleeve 42 is disposed between the two lifting bracket units 2 and is detachably connected to the support plate 1 via the mounting base 41. The mounting base 41 is a split structure, comprising an upper housing and a lower housing. The lower housing is detachably connected to the support plate 1 via bolts, and the upper housing is fastened to the lower housing and detachably connected to the upper and lower housings via bolts. The double-rotating threaded sleeve 42 is inserted into the mounting base 41 and is rotatably connected to the mounting base 41 via bearings. The forward-rotating screw 43 and the reverse-rotating screw 44 are respectively inserted at both ends of the double-rotating threaded sleeve 42. All are threadedly connected to the double-direction screw sleeve 42. A connecting sleeve 45 is fitted onto the end of the positive-direction screw 43 away from the double-direction screw sleeve 42 and the end of the negative-direction screw 44 away from the double-direction screw sleeve 42, respectively. Each connecting sleeve 45 is detachably connected to a lifting bracket unit 2 via a connecting seat 46. A hexagonal nut 421 is fitted onto the outer surface of each end of the double-direction screw sleeve 42, and both hexagonal nuts 421 are fixedly connected to the double-direction screw sleeve 42. When a worker clamps a wrench onto one of the hexagonal nuts 421 and rotates the wrench, the double-direction screw sleeve 42 rotates within the rotating seat 41. As the double-direction screw sleeve 42 rotates, the positive-direction screw 43 and the negative-direction screw 44 extend or retract according to the direction of rotation of the double-direction screw sleeve 42, thereby driving the lifting bracket unit 2 to move horizontally. Other components and connection methods are the same as in specific embodiment six.

[0041] Combination Figures 1 to 16 This embodiment differs from specific embodiment one in that the support positioning device further includes at least one oil tank 8. The oil tank 8 is installed in the empty space at the top of the support plate 1 and is fixedly connected to the support plate 1. The oil tank 8 is used to hold hydraulic oil and supplies oil to the lifting hydraulic cylinder 22 and the support hydraulic cylinder 31 through an oil pump 9 located on the oil tank 8. Simultaneously, a power supply box 10 is also provided in the empty space at the top of the support plate 1. The power supply box 10 contains a battery and supplies power to the power-consuming components within the device through the battery. Other components and connection methods are the same as in specific embodiment seven.

[0042] The present invention has been disclosed above with reference to preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

[0043] Working principle

[0044] This application provides a support and positioning device for use when power plant valves are connected to pipelines, which is suitable for the installation of power plant valves weighing less than 85 kg and with a flange end face diameter of less than 300 mm.

[0045] The working principle of this application is explained below using the top support portion 24 as an example of a V-shaped block:

[0046] During operation, the support positioning device is first pushed to the area below the installation area of ​​the power station valve. The working distance between the two lifting bracket units 2 is adjusted using the distance adjustment unit 4 according to the distance between the two flanges in the power station valve. Specifically, the double-rotating threaded sleeve 42 is rotated with a wrench. When the double-rotating threaded sleeve 42 rotates clockwise, the forward-rotating screw 43 and the reverse-rotating screw 44 move towards each other, simultaneously shortening the distance between the two lifting bracket units 2. When the double-rotating threaded sleeve 42 rotates counterclockwise, the forward-rotating screw 43 and the reverse-rotating screw 44 move away from each other, simultaneously increasing the distance between the two lifting bracket units 2. A scale is also provided on the top of the support plate 1 to facilitate the determination of the actual distance between the two lifting bracket units 2. After the working position of the lifting bracket unit 2 is adjusted, the piston rod end of the support hydraulic cylinder 31 in the bottom support unit 3 extends downwards until the bottom contact plate 33 contacts the ground and continues to extend until the caster wheel 5 leaves the ground. At this time, the positioning support device is activated from the bottom support unit 3. The lifting hydraulic cylinder 22 extends upwards to the pipeline accessories. The power station valve 7 to be installed is lifted to the installation area by the hoisting device. With the assistance of the staff, the flange of the power station valve 7 is lowered onto the top support 24 of each lifting bracket unit 2. At this time, the hoisting structure is not removed from the lifting lug of the power station valve 7. The piston rod of the lifting hydraulic cylinder 22 is further raised to make the axis of the power station valve 7 collinear with the axis of the pipeline to be connected. At this time, the sealing structure between the power station valve 7 and the pipeline is installed, and the pipeline is fastened to the power station valve 7 by bolt and nut assembly. After confirming that the power station valve 7 is installed stably, the lifting bracket unit 2 is lowered first to move the top support 24 away from the flange of the power station valve. Then the piston rod of the bottom support unit 3 is retracted to make the caster 5 re-contact the ground. At this time, the positioning support device is supported by the caster 5. After the staff pushes the support positioning device away from the installation area, the hoisting device is removed from the lifting lug on the valve and the installation of the next valve is carried out.

Claims

1. A support positioning device for use when a power station valve is connected to a pipeline, the support positioning device includes a support plate (1), a pusher (6), two lifting bracket units (2) and four casters (5), the four casters (5) are respectively set at the four corners of the bottom of the support plate (1), and each caster (5) is detachably connected to the support plate (1), the pusher (6) is set on one side of the support plate (1) and fixedly connected to the support plate (1), and the two lifting bracket units (2) are symmetrically arranged on the top of the support plate (1) along the center line of the width direction of the support plate (1); Its features are: The support positioning device also includes a spacing adjustment unit (4) and two bottom support units (3). The two lifting bracket units (2) are slidably connected to the support plate (1). The spacing adjustment unit (4) is located between the two lifting bracket units (2), and the fixing part of the spacing adjustment unit (4) is detachably connected to the top of the support plate (1). The two adjustment parts of the spacing adjustment unit (4) are detachably connected to one lifting bracket unit (2) respectively. The two bottom support units (3) are symmetrically arranged on the top of the support plate (1) along the center line of the length direction of the support plate (1), and the fixing part of each bottom support unit (3) is embedded in the support plate (1) and detachably connected to the support plate (1). The support part of each bottom support unit (3) passes through the support plate (1) and extends to the bottom of the support plate (1).

2. The support and positioning device used when a power plant valve is connected to a pipeline according to claim 1, characterized in that: The top of the support plate (1) is machined with a guide groove (11) for sliding connection with the lifting bracket unit (2), the top of the support plate (1) is machined with a stepped hole (12) for positioning connection with the bottom support unit (3), and the top of the support plate (1) is machined with a connection hole group (14) for positioning connection with the connecting caster wheel (5).

3. The support and positioning device used when a power plant valve is connected to a pipeline according to claim 2, characterized in that: The lifting bracket unit (2) includes a bottom slide (21). The bottom of the bottom slide (21) is provided with a guide column (211) that cooperates with the guide slide groove (11). The top of the bottom slide (21) is provided with a lifting hydraulic cylinder (22) for adjusting the working height of the top support (24). The top support (24) is installed at the piston rod end of the lifting hydraulic cylinder (22) through the top connecting plate (23). The top support (24) is used to support the power station valve (7).

4. The support and positioning device used when a power plant valve is connected to a pipeline according to claim 1, characterized in that: The bottom support unit (3) includes a support hydraulic cylinder (31), which is inverted on the support plate (1) and detachably connected to the support plate (1) through a fixed seat (32). The piston rod end of the support hydraulic cylinder (31) passes through the fixed seat (32) and the support plate (1) in sequence and is detachably connected to the bottom contact plate (33) located below the support plate (1).

5. The support and positioning device used when a power plant valve is connected to a pipeline according to claim 1, characterized in that: The spacing adjustment unit (4) includes a double-rotating screw sleeve (42). The double-rotating screw sleeve (42) is set between two lifting bracket units (2) and fixed on the support plate (1) by the mounting base (41). The double-rotating screw sleeve (42) is rotatably connected to the mounting base (41). A forward-rotating screw (43) and a reverse-rotating screw (44) are inserted in the double-rotating screw sleeve (42). The double-rotating screw sleeve (42) is threadedly connected to both the forward-rotating screw (43) and the reverse-rotating screw (44). The forward-rotating screw (43) and the reverse-rotating screw (44) are detached and connected to one lifting bracket unit (2) respectively. By rotating the double-rotating screw sleeve (42) in the forward or reverse direction, the forward-rotating screw (43) and the reverse-rotating screw (44) are brought closer to each other or moved further away from each other, thereby adjusting the spacing between the two lifting bracket units (2).

6. The support and positioning device used when a power plant valve is connected to a pipeline according to claim 5, characterized in that: A hexagonal nut (421) is fitted on the outer circular surface of each end of the double-screw sleeve (42), and both hexagonal nuts (421) are fixedly connected to the double-screw sleeve (42).

7. The support and positioning device used when a power plant valve is connected to a pipeline according to claim 3, characterized in that: The top support (24) is a V-shaped block.

8. A support and positioning device for use when a power plant valve is connected to a pipeline, as described in claim 7, characterized in that: The top support (24) is a clamping mechanism.

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