A nut installation lifting device for a stay ring volute foundation bolt

Abstract

A kind of nut mounting lifting device of seat ring volute foundation bolt, belong to the technical field of water and electricity engineering installation equipment, including foundation support, the foundation support is connected with unit draft tube, detachably connected with support column on the foundation support, support column is equipped with the slide arm that can move up and down along the length direction of support column, the slide arm is rotatably connected between support column, the slide arm is driven to move up and down by drive system, the end of the slide arm is fixedly connected with the upper tray and lower tray arranged in parallel, the lower tray includes fixed disc and rotating disc arranged in the fixed disc and rotatable around the circumferential direction of fixed disc.The utility model discloses, device installation is convenient and fast, simultaneously, the safety factor in operating process is high, can reduce labor intensity and work efficiency is high while reducing labor, effectively saves linear construction period, improves the economic benefit of project construction.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydropower engineering installation equipment, and relates to the field of pump and turbine base volute bolt installation, and in particular to a nut installation and lifting device for the base bolt of the seat ring volute. Background Technology

[0002] The installation quality of the foundation bolts on the pump turbine housing ring and volute is crucial for the safe and stable operation of a hydropower station, mainly in the following aspects: ① The foundation bolts must bear the weight of the housing ring and volute itself, as well as the static loads such as the internal water, to ensure structural stability; ② If the preload and verticality of the foundation bolts do not meet the requirements during installation, they may loosen or break during operation, posing a safety hazard to the unit; ③ The installation of foundation bolts ensures that the housing ring and volute are evenly stressed during operation, reducing local stress concentration, minimizing equipment fatigue damage, and extending the service life of the equipment.

[0003] During installation, one end of the foundation bolt is screwed into the bolt hole of the volute body, and the other end is tightened to the seat ring volute bracket base with a nut. After the volute is installed and adjusted, it is first pre-tightened to 10% of the residual tension value. It needs to be pre-tightened again before the concrete is poured. After the volute concrete is poured, it is pre-tightened to 100%. During pre-tightening, a hydraulic tensioner (consisting of a support body and a piston nut) is used to perform the pre-tightening in sections and times.

[0004] Currently, the installation and lifting of nuts and tensioners in the industry are all done manually using simple supports. Each machine base ring volute is designed with 40 foundation bolts, and the matching nuts and washers weigh approximately 45 kg each. During lifting, two workers first pass the washers through the bolts and hold them in place, while the remaining workers use simple supports to lift the nuts to below the bolts, and then manually rotate the nuts to engage with the screw. A set of hydraulic tensioners weighs approximately 50 kg and must be installed on the bolts in the same way before pre-tightening. Each machine base ring volute requires the installation and removal of hydraulic tensioners at least 240 times (before the volute hydrostatic test, before pressure holding and pouring, and after pouring), which is a considerable amount of work.

[0005] Traditional simple scaffold installation requires a large number of workers to work together, demands high physical strength from the workers, has limited working space, and is fraught with safety risks. Simple scaffolds are inefficient, consume a lot of resources, and have long lead times, making it difficult to meet on-site requirements for schedule, quality, and safety. Therefore, we propose a nut installation and lifting device for the seat ring volute foundation bolts. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a nut installation and lifting device for a seat ring volute foundation bolt, which solves the technical problems of high strength requirements for operators, limited construction space, high safety risks and low efficiency in the nut installation and lifting of seat ring volute foundation bolts in the prior art.

[0007] To achieve the above and other related objectives, this utility model provides a nut installation and lifting device for a seat ring volute foundation bolt, including a foundation support connected to the unit's tailwater pipe. A support column is detachably connected to the foundation support, and a sliding arm that can move up and down along the length of the support column is sleeved on the support column. The sliding arm is rotatably connected to the support column, and the sliding arm is driven to move up and down by a drive system. A parallel upper tray and a rotatable lower tray are fixedly connected to the end of the sliding arm.

[0008] In any of the above embodiments, the preferred embodiment is that the foundation support includes a support body, a column foundation is fixedly connected to the middle of the support body, a connection hole is opened on the column foundation, and a setter block is fixedly connected to the middle of each side wall of the support body, and each setter block is provided with 2 sets of setter screws.

[0009] Preferably, in any of the above embodiments, the support body is a regular hexagonal structure, and at least two sets of reinforcing rings are provided in the support body along its circumference.

[0010] In any of the above embodiments, the preferred embodiment is that the supporting column includes a base and a column, the base is connected to the column base by bolts, and the column is hollow inside with its bottom welded to the base.

[0011] Preferably, in any of the above embodiments, the column is provided with a counterweight.

[0012] In any of the above embodiments, the preferred embodiment is that the sliding arm includes a central slider, the central slider is sleeved outside the column and an anti-wear rotating ring is provided between the central slider and the column, a support arm and a counterweight arm are fixedly connected to both sides of the central slider, a tray support is fixedly connected to the suspended end of the support arm, and the upper tray and the lower tray are connected in parallel to the upper and lower ends of the tray support.

[0013] Preferably, in any of the above embodiments, the support arm consists of three steel sections and reinforcing rods arranged in a triangular pattern.

[0014] In any of the above embodiments, the preferred embodiment is that the drive system includes a top cover, which is bolted to the upper end of the column, and a drive motor is connected to the top cover. The drive motor is connected to a pulley system through a gear set, and a steel wire rope is provided on the pulley system.

[0015] In any of the above embodiments, it is preferred that one end of the two steel wire ropes is fixedly connected to the center of the top of the counterweight, and the other end passes through the top cover, passes through the pulley block, and is connected to the anti-wear rotating ring respectively.

[0016] As described above, the nut installation and lifting device for the seat ring volute foundation bolt of this utility model has the following beneficial effects:

[0017] 1. In this utility model, the device is fixed to the outlet of the tailwater pipe by a locking block, making installation and disassembly convenient and quick.

[0018] 2. In this utility model, the drive system drives the sliding arm to move up and down, which can simultaneously lift the washer and nut (or support body and piston nut), avoiding the need for operators to manually hold the washer continuously. At the same time, the lower tray can rotate, and after being lifted to the installation height, the nut and screw can be easily engaged by rotating the lower tray, which improves the safety factor during operation. In addition, it can reduce labor intensity while reducing labor.

[0019] 3. In this utility model, the sliding arm can rotate 360° around the column, thereby ensuring that the nuts in each part can be installed, which improves the installation efficiency. Attached Figure Description

[0020] Figure 1 The diagram shown is a structural schematic of this utility model.

[0021] Figure 2 The diagram shows the composition of the foundation support.

[0022] Figure 3 This is a schematic diagram showing the components of the supporting column.

[0023] Figure 4 The diagram shows the components of the sliding arm.

[0024] Figure 5 The diagram shows the components of the drive system.

[0025] Component designation explanation

[0026] 1-Basic support, 1.1-Setting block, 1.2-Setting screw, 1.3-Support body, 1.4-Column foundation, 2-Support column, 2.1-Base, 2.2-Column, 3-Sliding arm, 3.1-Counterweight arm, 3.2-Central slider, 3.3-Support arm, 3.4-Counterweight block, 3.5-Pattern support, 3.6-Upper tray, 3.7-Lower tray, 3.8-Wire rope, 3.9-Wear-resistant rotating ring, 4-Drive system, 4.1-Top cover, 4.2-Drive motor, 4.3-Pulley block. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0028] Please see Figures 1 to 5It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0029] Please see Figure 1-5 This utility model provides a nut installation and lifting device for a seat ring volute foundation bolt, including a foundation support 1, which is connected to the tailwater pipe of the unit. A support column 2 is detachably connected to the foundation support 1. A sliding arm 3 that can move up and down along the length of the support column 2 is sleeved on the support column 2. The sliding arm 3 is rotatably connected to the support column 2. The sliding arm 3 is driven to move up and down by a drive system 4. The end of the sliding arm 3 is fixedly connected to a parallel upper tray 3.6 and a rotatable lower tray 3.7.

[0030] In this embodiment, the worker places the washer on the upper tray 3.6 and the nut on the lower tray 3.7. The drive system 4 is then activated, causing the sliding arm 3 to rise below the bolt. The concentricity of the bolt and nut is initially adjusted by rotating the sliding arm 3. The drive system 4 is then activated again to ensure the nut and bolt are properly engaged. The lower tray 3.7 is then rotated to fully engage the nut and bolt. After installing one nut, the drive system 4 lowers the sliding arm 3 to allow for the installation of the next nut.

[0031] As a further description of the above embodiment, the foundation support 1 includes a support body 1.3, which is a regular hexagonal structure divided into three rings to ensure the stability and firmness of the overall structure of the foundation support 1. A column foundation 1.4 is welded to the middle of the support body 1.3, and a connection hole is provided on the column foundation 1.4. Each side wall of the support body 1.3 is fixedly connected to a setter block 1.1, and each setter block 1.1 is provided with two sets of setter screws 1.2. The setter screws 1.2 are threadedly engaged with the setter block 1.1, and rotating the setter screws 1.2 can fix the entire structure to the tailwater pipe of the unit.

[0032] As a further description of the above embodiment, the supporting column 2 includes a base 2.1 and a column 2.2. The base 2.1 is connected to the column base 1.4 by bolts. The column 2.2 is hollow inside, and its bottom is welded to the base 2.1. A counterweight 3.4 is provided inside the hollow interior of the column 2.2. Two through holes are provided at the upper end of the column 2.2 to facilitate the passage of a steel wire rope 3.8.

[0033] In this embodiment, a baffle is provided at the top of the column 2.2 along its circumference to prevent the counterweight 3.4 from moving out of the column 2.2. Two through holes are symmetrically formed along the center of the baffle, and the positions of the through holes correspond to the positions of the two steel wire ropes 3.8. The diameter of the through holes is 1mm larger than the diameter of the steel wire ropes 3.8 to ensure that the steel wire ropes 3.8 can pass smoothly through the through holes without friction, thereby reducing frictional loss and extending the service life of the steel wire ropes 3.8.

[0034] In this embodiment, the side wall of the base 2.1 is provided with several triangular stiffening plates along its axial direction to increase the stability of the base 2.1, thereby increasing the stability of the entire lifting device.

[0035] As a further description of the above embodiment, the sliding arm 3 includes a central slider 3.2, which is a hollow cylindrical frame structure that fits tightly against the column 2.2. The central slider 3.2 is sleeved on the outside of the column 2.2, and an anti-wear rotating ring 3.9 is provided between the central slider 3.2 and the column 2.2 to ensure that the central slider 3.2 and the column 2.2 are rotatably connected, so that the central slider 3.2 can rotate 360° around the column 2.2, thereby meeting the installation requirements of various parts.

[0036] The central slider 3.2 is bolted to both sides by support arms 3.3 and counterweight arms 3.1. The counterweight arms 3.1 ensure the balance of the entire slider system and prevent the central slider 3.2 from tilting and getting stuck on the column 2.2, thus affecting the normal operation of the device. The support arms 3.3 consist of three triangularly arranged steel sections and reinforcing rods. The suspended end of the support arms 3.3 is welded to a tray support 3.5. The upper end of the tray support 3.5 is an upper tray 3.6, and the lower end is a rotatable lower tray 3.7 with ball bearings mounted on the side.

[0037] In this embodiment, a handle is arranged below the lower tray 3.7. When it is raised to the installation height, the nut and screw can be easily engaged by rotating the handle.

[0038] As a further description of the above embodiment, the drive system 4 includes a top cover 4.1, which is bolted to the upper end of the column 2.2. A drive motor 4.2 is fixedly connected to the top cover 4.1 by bolts. The drive motor 4.2 is connected to a pulley block 4.3 via a gear set. A steel wire rope 3.8 is provided on the pulley block 4.3. One end of the steel wire rope 3.8 is fixedly connected to the top center of the counterweight block 3.4, and the other end passes through a through hole, passes over two pulleys on the pulley block 4.3, and is then fixedly connected to an anti-wear rotating ring 3.9. The drive motor 4.2 rotates forward and backward to drive the pulley block 4.3 to rotate, thereby driving the steel wire rope 3.8 to move around the pulley block 4.3, thus moving the sliding arm 3 up and down to meet different height installation requirements.

[0039] In this embodiment, the wear-resistant rotating ring 3.9 is fixedly connected to the center slider 3.2, and the wire rope 3.8 is connected to the wear-resistant rotating ring 3.9, ensuring that while the wire rope 3.8 drives the center slider 3.2 to move up and down, the center slider 3.2 can rotate around the column 2.2.

[0040] In this embodiment, the operation of the drive motor 4.2 is controlled by a remote control, which is simple and effortless.

[0041] In this embodiment, the two side walls of the top cover 4.1 are symmetrically recessed inward to form U-shaped holes. The wire rope 3.8 passes through the U-shaped holes and connects to the wear-resistant rotating ring 3.9. The U-shaped holes prevent the wire rope 3.8 from contacting the top cover 4.1 and changing its direction, thus increasing the force required to move the sliding arm 3 up and down. At the same time, they also prevent friction between the wire rope 3.8 and the top cover 4.1, reducing friction loss and improving the service life of the wire rope 3.8.

[0042] In summary, the installation process of the nut installation and lifting device for the seat ring volute foundation bolts is as follows:

[0043] After the concrete pouring of the unit's tailrace pipe and seat ring volute tensioning screw support is completed, the foundation support 1 is hoisted into the pit using a construction crane on site. The gap between the setter block 1.1 and the tailrace pipe opening is adjusted to ensure uniformity. The level of the column foundation 1.4 is adjusted to meet the assembly requirements by adding shims between the pipe opening and the support body 1.3. The set screws 1.2 are symmetrically tightened to reliably fix the entire foundation support 1 onto the tailrace pipe.

[0044] After the foundation support 1 is fixed, the support column 2 is hoisted into the machine pit using a construction bridge machine. The base 2.1 is aligned with the mating hole of the column foundation 1.4. After the verticality of the column 2.2 is adjusted to meet the installation requirements, the support column 2 is fixed with bolts.

[0045] After the support column 2 is fixed, the wear-resistant rotating ring 3.9 is fixedly connected to the central slider 3.2. Then, the construction bridge machine is used to mount the central slider 3.2 onto the column 2.2, and the counterweight 3.4 is hoisted into the column 2.2, keeping the end of the lifting wire rope 3.8 exposed. The counterweight arm 3.1 is connected to the central slider 3.2 by the clamping bolts, and the support arm 3.3 is also connected to the central slider 3.2 by the clamping bolts.

[0046] After the sliding arm 3 is installed, the drive unit 4 is installed using on-site lifting equipment. The top cover support 4.1 is aligned with the engagement hole at the top end of the column 2.2, and the top cover support 4.1 is fixed with bolts. The lifting wire rope 3.8 is passed through the center hole of the top cover support 4.1, passes around the pulley block 4.3, and connects to the wear-resistant rotating ring 3.9. After installing the relevant components of the drive system 4.2, the entire system is tested under no-load to ensure normal operation.

[0047] When installing the nut or hydraulic tensioner, the operator places the washer on the upper tray 3.5 and the nut on the lower tray 3.7. Using the remote control, the drive motor 4.2 is raised to below the bolt. The bolt and nut are initially aligned by rotating the slide arm 3. The nut and bolt are then engaged by continuing to operate the remote control. The handle on the lower tray 3.7 is then manually rotated to fully engage the nut and bolt. After installing one nut, the drive motor 4.2 is operated to lower the slide arm 3, and the next nut is installed. Once the seat ring volute foundation bolts are finally tightened, the entire equipment is dismantled in reverse order of installation for use by the next unit.

[0048] In summary, this utility model offers convenient and quick installation and disassembly of the device, along with a high safety factor during operation. It reduces labor intensity and increases work efficiency, effectively shortening the linear construction period and improving the economic benefits of project construction. Therefore, this utility model effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A nut installation and lifting device for a seat ring volute foundation bolt, comprising a foundation support (1), characterized in that: The base support (1) is connected to the tailwater pipe of the unit. A support column (2) is detachably connected to the base support (1). A sliding arm (3) that can move up and down along the length of the support column (2) is sleeved on the support column (2). The sliding arm (3) is rotatably connected to the support column (2). The sliding arm (3) is driven to move up and down by the drive system (4). The end of the sliding arm (3) is fixedly connected to a parallel upper tray (3.6) and a rotatable lower tray (3.7).

2. The nut installation and lifting device for the seat ring volute foundation bolt according to claim 1, characterized in that: The foundation support (1) includes a support body (1.3), a column foundation (1.4) is fixedly connected to the middle of the support body (1.3), and a setter block (1.1) is fixedly connected to the middle of each side wall of the support body (1.3), and each setter block (1.1) is provided with 2 sets of setter screws (1.2).

3. The nut installation and lifting device for the seat ring volute foundation bolt according to claim 2, characterized in that: The support (1.3) has a regular hexagonal structure, and at least two sets of reinforcing rings are provided along its circumference inside the support (1.3).

4. The nut installation and lifting device for the seat ring volute foundation bolt according to claim 2, characterized in that: The supporting column (2) includes a base (2.1) and a column (2.2). The base (2.1) is connected to the column base (1.4) by bolts. The column (2.2) is hollow inside and the bottom of the column (2.2) is welded to the base (2.1).

5. The nut installation and lifting device for the seat ring volute foundation bolt according to claim 4, characterized in that: The column (2.2) is equipped with a counterweight (3.4).

6. The nut installation and lifting device for the seat ring volute foundation bolt according to claim 1, characterized in that: The sliding arm (3) includes a central slider (3.2), which is sleeved on the outside of the column (2.2) and an anti-wear rotating ring (3.9) is provided between the central slider (3.2) and the column (2.2). A support arm (3.3) and a counterweight arm (3.1) are fixedly connected to both sides of the central slider (3.2). A tray support (3.5) is fixedly connected to the suspended end of the support arm (3.3). The upper tray (3.6) and the lower tray (3.7) are connected in parallel to the upper and lower ends of the tray support (3.5).

7. The nut installation and lifting device for the seat ring volute foundation bolt according to claim 6, characterized in that: The support arm (3.3) consists of three steel sections arranged in a triangular pattern and reinforcing rods.

8. The nut installation and lifting device for the seat ring volute foundation bolt according to claim 5, characterized in that: The drive system (4) includes a top cover (4.1), which is bolted to the upper end of the column (2.2). A drive motor (4.2) is connected to the top cover (4.1), and the drive motor (4.2) is connected to a pulley block (4.3) through a gear set. A wire rope (3.8) is provided on the pulley block (4.3).

9. The nut installation and lifting device for the seat ring volute foundation bolt according to claim 8, characterized in that: One end of each of the two steel wire ropes (3.8) is fixedly connected to the top center of the counterweight (3.4), and the other end passes through the top cover (4.1), passes around the pulley block (4.3), and is connected to the wear-resistant rotating ring (3.9).

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