Main beam erecting device for tail water maintenance platform of water-turbine generator set

Abstract

A main beam erecting device for a tail water overhauling platform of a water-turbine generator set relates to the technical field of overhauling of water-turbine generators and comprises a main beam and a tail water pipe, guide mechanisms and an adjusting mechanism are arranged in the tail water pipe, the guide mechanisms are distributed at the top and the bottom of the tail water pipe, and each guide mechanism is composed of a plurality of pulley components. The pulley components of the two guide mechanisms correspondingly abut against the main beam; the adjusting mechanism is used for adjusting the gradient of the main beam; according to the device, the girder can be conveniently erected and mounted.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine generator overhaul, in particular to a main beam erecting device for a tailwater overhaul platform of a water turbine generator set. Background Art

[0002] When a hydro-turbine generator set is under maintenance, it is often necessary to set up a tailwater maintenance platform to assist in the inspection of the generator's runner. The main beam is an important load-bearing component of the entire tailwater maintenance platform. Therefore, the integrity of the main beam is related to the quality of the entire platform and the safety of the subsequent inspection personnel.

[0003] The existing main beam erection method is to firstly insert the main beam into the tailwater pipe by manpower, and rely on the wall of the tailwater pipe to bear the gravity of the main beam; then use a hand chain hoist to send the main beam into the tailwater pipe, during which the support block in the tailwater pipe can prevent the main beam from tilting to both sides;

[0004] However, when the tailwater platform is erected by the existing method, when most of the main beam is sent into the tailwater pipe, since there is a certain hollow area inside the tailwater pipe, the main beam will be suspended after moving to the central control area, and the weight of the main beam inside and outside the tailwater pipe is not equal, which will cause the main beam inside the tailwater pipe to sink. Although the hand chain hoist and the support block can limit the up and down movement of the main beam to a certain extent, they cannot keep the main beam completely horizontal, and thus cannot be accurately erected in the support groove of the tailwater pipe;

[0005] At present, jacks are generally added to the main beam to adjust the horizontality of the main beam to ensure that the head end of the main beam can be placed on the support groove. However, it is difficult to install ordinary fixed jacks. After adjusting the internal height of the main beam, the main beam cannot be moved due to the inability to release force. It is easy to deviate, tilt, fall off, and even cause risks of squeezing and injuring people.

[0006] Chinese patent (CN104131540B) discloses a main beam installation method for a tailwater pipe inspection platform of a hydro-turbine generator set. By adopting a segmented main beam structure, the main beam of the tailwater pipe inspection platform of the hydro-turbine generator set can still be conveniently installed in place when the reserved main beam installation groove is buried or cancelled; the required construction equipment is simple during installation and construction, the coordination is simple during construction, the operation difficulty can be reduced, and the construction cost is low; however, this method makes the installation of the main beam cumbersome, thereby increasing the workload of the staff, and even if the segmented main beam is still skewed when moving in the tailwater pipe, resulting in contact between the main beam and the tailwater pipe wall, affecting the quality of the main beam;

[0007] Therefore, we propose a device that can facilitate the erection and installation of the main beam. Utility Model Content

[0008] In order to overcome the deficiencies in the background art, the utility model discloses a main beam erection device for the tail water maintenance platform of a water turbine generator set.

[0009] To achieve the above-mentioned invention purpose, the utility model adopts the following technical scheme:

[0010] A main beam erection device for the tail water maintenance platform of a water turbine generator set, including a main beam and a draft tube. A guiding mechanism and an adjusting mechanism are arranged in the draft tube. The guiding mechanism is distributed at the top and bottom of the draft tube. The guiding mechanism is composed of a plurality of pulley components, and the pulley components of the two guiding mechanisms are respectively in contact with the main beam.

[0011] The adjusting mechanism is used to adjust the inclination of the main beam.

[0012] Preferably, the distance between the pulley component at the top of the draft tube and the main beam is 3-7 mm.

[0013] Preferably, the plurality of pulley components in the two guiding mechanisms are arranged in a staggered manner correspondingly.

[0014] Preferably, the adjusting mechanism includes a scissor jack, a moving component and a connecting component. The two ends of the scissor jack are respectively fixedly connected with the moving component and the connecting component. The moving component is in contact with the top of the draft tube, and the connecting component is fixedly connected with the main beam.

[0015] Preferably, the moving component includes a bottom plate. The bottom plate is fixedly connected with the tail end of the scissor jack, and four moving wheels are arranged on the bottom plate in a rectangular distribution.

[0016] Preferably, the connecting component includes a U-shaped card slot. The U-shaped end of the U-shaped card slot is connected with the main beam, and the installation end of the U-shaped card slot is fixedly connected with the head end of the scissor jack.

[0017] Preferably, a spirit level is arranged on the main beam.

[0018] Due to adopting the above-mentioned technical scheme, the utility model has the following beneficial effects:

[0019] A main beam erection device for the tail water maintenance platform of a water turbine generator set disclosed by the utility model

[0020] 1. The guiding mechanism can give certain sliding guidance when the main beam moves, thus avoiding direct hard friction between the main beam and the draft tube and improving the safety during the erection process of the main beam.

[0021] 2. In addition, the two guiding mechanisms can also keep the main beam at a certain levelness when moving, thereby restricting the amplitude of the up and down warping of the main beam.

[0022] 3. When the head end of the main beam is about to be placed in the support groove, the adjustment mechanism can apply a downward force to the tail end of the main beam to level the main beam so that it can enter the support groove.

[0023] 4. The adjustment mechanism can move with the main beam through the moving component, ensuring that the head end of the main beam enters the support groove in a horizontal state. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the present utility model;

[0025] Figure 2 It is a schematic structural diagram of the adjustment mechanism.

[0026] In the figure: 1. Main beam; 2. Draft tube; 3. Guiding mechanism; 4. Adjustment mechanism; 41. Scissor jack; 42. Moving component; 421. Moving wheel; 43. Connecting component; 431. Jackscrew; 5. Support groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions of the present utility model will be described in conjunction with the drawings in the embodiments of the present utility model. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, they are only corresponding to the drawings of the present utility model for the convenience of describing the present utility model, rather than indicating or implying that the device or component referred to must have a specific orientation:

[0028] Embodiment 1 is as follows:

[0029] Combined with the attached Figure 1-2 A main beam erection device for a draft tube maintenance platform of a hydro-generator set, including a main beam 1 and a draft tube 2. A guiding mechanism 3 and an adjustment mechanism 4 are arranged in the draft tube 2. The guiding mechanism 3 is distributed at the top and bottom of the draft tube 2, that is, the guiding mechanism 3 is set in two parts. One part is used to support the bottom of the main beam 1, and the other part is used to provide a downward pressure to the main beam 1. By combining the two, the main beam 1 is clamped to enable the main beam 1 to maintain a certain levelness;

[0030] The guiding mechanism 3 is composed of a plurality of pulley components, and the pulley components of the two guiding mechanisms 3 are in contact with the main beam 1 correspondingly;

[0031] In addition, the pulley assembly is composed of a support column and a pulley. The support column is fixedly connected to the pipe wall of the draft tube 2, and the pulley is in contact with the main beam 1 correspondingly;

[0032] By contacting the main beam 1 with the pulley part of the pulley component, certain sliding guidance can be given to the main beam 1 when the main beam 1 moves, thereby avoiding direct hard friction between the main beam 1 and the draft tube 2 and improving the safety during the erection process of the main beam 1.

[0033] The adjustment mechanism 4 is used to adjust the inclination of the main beam 1. It should be noted that the adjustment mechanism 4 is located at the top inside the draft tube 2. When the head end of the main beam 1 is in the hollow area of the draft tube 2 to a large extent, the tail end of the main beam 1 will warp upward in the draft tube 2. Therefore, at this time, the adjustment mechanism 4 will apply a downward force to the tail end of the main beam 1, so that the main beam 1 can return to horizontal, and further ensure that the head end of the main beam 1 can smoothly enter the support groove 5.

[0034] Embodiment 2 is as follows:

[0035] On the basis of Embodiment 1, the pulley component is further limited. Specifically, the distance between the pulley component located at the top of the draft tube 2 and the main beam 1 is 3-7 mm. After the main beam 1 enters the hollow area of the draft tube 2 but before entering the support groove 5, although there will be a certain degree of warping, at this time, for the main beam 1, its head end is subject to gravity and the traction force of the manual hoist, and its tail end is subject to the pressure in different directions applied by the two guiding mechanisms 3. By setting a certain distance between the pulley component and the main beam 1, the stress on the main beam 1 itself can be reduced, so as to protect the main beam 1 from bending due to excessive force.

[0036] Embodiment 3 is as follows:

[0037] On the basis of Embodiment 2, the distribution of the pulley components is further limited. Specifically, among the multiple pulley components in the two guiding mechanisms 3, they are arranged in an alternating manner.

[0038] Through the alternately arranged pulley components, the supporting force or downward pressure applied to the main beam 1 can be dispersed, so as to further improve the safety of the main beam 1 during movement. And, compared with clamping the main beam 1 at a single point, the dispersed clamping method has higher clamping stability for the main beam 1. Even when the main beam 1 is in a slightly warped state, it will not affect the movement stability of the main beam 1 in the draft tube 2.

[0039] Embodiment 4 is as follows:

[0040] On the basis of Embodiment 1, the adjustment mechanism 4 is further limited. Specifically, the adjustment mechanism 4 includes a scissor jack 41, a moving component 42 and a connecting component 43. The two ends of the scissor jack 41 are respectively fixedly connected to the moving component 42 and the connecting component 43. The moving component 42 abuts against the top of the draft tube 2, and the connecting component 43 is fixedly connected to the main beam 1.

[0041] By adjusting the opening amplitude of the scissor jack 41, the downward pressure exerted by the adjusting mechanism 4 on the main beam 1 can be changed, so as to keep the main beam 1 horizontal. At the same time, the moving part 42 is also in contact with the top of the draft tube 2 at this time. Then, during the subsequent movement of the main beam 1, the connecting part 43, the moving part 42 and the scissor jack 41 will also move accordingly, enabling the adjusting mechanism 4 to continuously maintain the pressing state on the main beam 1.

[0042] Embodiment 5 is as follows:

[0043] On the basis of Embodiment 4, the moving part 42 is further defined. Specifically, the moving part 42 includes a bottom plate, the bottom plate is fixedly connected to the tail end of the scissor jack 41, and four moving wheels 421 distributed in a rectangle are arranged on the bottom plate;

[0044] The setting of the bottom plate can increase the overall supporting area and stability of the adjusting mechanism 4, and the installation parts of the four moving wheels 421 are welded to the bottom plate, which can enhance the connection strength between them. However, during the welding process, attention should be paid to controlling the deformation of the bottom plate to avoid affecting the overall levelness of the adjusting mechanism 4.

[0045] In addition, the connecting part 43 includes a U-shaped card slot. The U-shaped end of the U-shaped card slot is connected to the main beam 1, and the installation end of the U-shaped card slot is fixedly connected to the head end of the scissor jack 41; a set screw 431 hole is arranged on the side of the U-shaped card slot. After the U-shaped end of the U-shaped card slot is correspondingly fitted and clamped with the main beam 1, the set screw 431 is installed in the set screw 431 hole and tightened, and the connection between the connecting part 43 and the main beam 1 can be completed, that is, the connection between the adjusting mechanism 4 and the main beam 1; and this connection method will not cause damage to the structure of the main beam 1 and protects the structural integrity of the main beam 1.

[0046] Embodiment 6 is as follows:

[0047] On the basis of Embodiment 5, a level is arranged on the main beam 1. Through this level, the inclination state of the main beam 1 can be detected. If the inclination degree of the main beam 1 exceeds 10°, it is necessary to use the adjusting mechanism 4 to adjust the levelness of the main beam 1.

[0048] When implementing the main beam erection device for the tail water maintenance platform of a water turbine generator unit of the present utility model, first, a guiding mechanism 3 is arranged on the head end pipe wall of the draft tube 2, that is, a plurality of pulley components are respectively arranged at the top and bottom inside the draft tube 2; then, the head end of the main beam 1 enters from the head end of the draft tube 2 and moves towards the tail end of the draft tube 2 under the traction of the manual hoist. When the main beam 1 moves to the hollow area of the draft tube 2, the gravity acting on the head end of the main beam 1 gradually increases, so that the head end of the main beam 1 gradually inclines downward, that is, the tail end of the main beam 1 warps upward; when the tail end of the main beam 1 is about to reach the support groove 5, the adjustment mechanism 4 is put into the draft tube 2 and connected to the main beam 1. Finally, the main beam 1 is adjusted to the horizontal state according to the adjustment mechanism 4, and the manual hoist continues to traction the main beam 1 to make the tail end of the main beam 1 enter the support groove 5;

[0049] It should be noted that after the adjustment mechanism 4 is assembled, the lowest height is only 240mm, which is sufficient to be used in various narrow spaces; at the same time, the adjustable height of the scissor jack 41 is 250mm, which can effectively adjust the upper and lower heights of both ends of the main beam 1, hold the main beam 1 firmly, and move along with it during the movement of the main beam 1, solving the problem that the ordinary device cannot accurately hold and adjust the main beam 1, with large moving resistance, time-consuming and laborious.

[0050] The parts not detailed in the present utility model are the prior art. For those skilled in the art, obviously, the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model, and any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A main beam erection device for a tailwater maintenance platform of a hydro-generator set, characterized by: The invention comprises a main beam (1) and a tailwater pipe (2), wherein a guide mechanism (3) and an adjustment mechanism (4) are arranged in the tailwater pipe (2), wherein the guide mechanism (3) is distributed at the top and the bottom of the tailwater pipe (2), the guide mechanism (3) is composed of a plurality of pulley components, and the pulley components of the two guide mechanisms (3) are in corresponding contact with the main beam (1); The adjustment mechanism (4) is used to adjust the inclination of the main beam (1).

2. The main beam erection device for the tailwater maintenance platform of a hydro-generator set according to claim 1, characterized in that: The distance between the pulley component located at the top of the tailwater pipe (2) and the main beam (1) is 3-7 mm.

3. The main beam erection device for the tailwater maintenance platform of a hydro-generator set as claimed in claim 2, characterized in that: The multiple pulley components in the two guide mechanisms (3) are arranged in a staggered manner.

4. The main beam erection device for the tailwater maintenance platform of a hydro-generator set according to claim 1, characterized in that: The adjustment mechanism (4) comprises a scissor jack (41), a moving component (42) and a connecting component (43), wherein two ends of the scissor jack (41) are fixedly connected to the moving component (42) and the connecting component (43) respectively, the moving component (42) contacts the top of the tailwater pipe (2), and the connecting component (43) is fixedly connected to the main beam (1).

5. The main beam erection device for the tailwater maintenance platform of a hydro-generator set as claimed in claim 4, characterized in that: The moving component (42) comprises a bottom plate, which is fixedly connected to the rear end of the scissor jack (41), and is provided with four moving wheels (421) distributed in a rectangular shape.

6. The main beam erection device for the tailwater maintenance platform of a hydro-generator set as claimed in claim 4, characterized in that: The connecting component (43) comprises a U-shaped slot, the U-shaped end of the U-shaped slot is connected to the main beam (1), and the mounting end of the U-shaped slot is fixedly connected to the head end of the scissor jack (41).

7. The main beam erection device for the tailwater maintenance platform of a hydro-generator set according to claim 1, characterized in that: A level is provided on the main beam (1).

Images