Auxiliary device for pulling core package of steam feed pump

Abstract

The utility model relates to the technical field of water pump maintenance, and discloses a steam feed pump core-pulling package auxiliary device which comprises a first base, a translation mechanism, an auxiliary shaft, a second base, a first lifting mechanism, a first wheel set, a second lifting mechanism and a second wheel set. The translation mechanism is arranged on the first base, and a vertical frame is arranged at the output end of the translation mechanism; the auxiliary shaft is arranged at the rear end of the core bag; the first lifting mechanism is arranged on the second base, and a movable table is arranged at the output end of the first lifting mechanism; the first wheel set is rotatably arranged on the movable table; the first wheel set is in sliding fit with the lower surface of the auxiliary shaft; the second lifting mechanism is arranged on the movable table, and a door-shaped frame is arranged at the output end of the second lifting mechanism. The second wheel set is rotationally arranged on the inner top of the door-shaped frame and is in sliding fit with the upper surface of the auxiliary shaft. According to the auxiliary device for pulling the core package of the steam feed pump, the core package is axially and stably pulled away, the operating threshold of workers is low, and the core pulling efficiency and safety are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water pump maintenance, in particular to a core pulling auxiliary device for a pneumatic water supply pump. Background Art

[0002] Feedwater pumps, core equipment in industrial systems such as thermal and nuclear power plants, are responsible for delivering high-pressure water to boilers or reactors. Their operational reliability directly impacts unit safety. Long-term high-pressure, high-speed operation can easily lead to wear, corrosion, or scaling of the feedwater pump's core, necessitating regular extraction and maintenance.

[0003] However, the core pack is complex, heavy, and has a small clearance with the pump casing. Traditional disassembly relies on an electric hoist to lift the front end of the core pack, supplemented by manual traction. This method requires full control by experienced personnel, who repeatedly adjust the lifting angle and traction force, slowly moving the core pack to avoid collision with the pump casing. During operation, the core pack is prone to shifting or shaking due to uneven force, which not only risks scratching components but also may cause safety accidents. In addition, manual traction is inefficient, significantly increasing disassembly time and seriously affecting the unit's maintenance cycle.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a pneumatic water pump core pack extraction auxiliary device, aiming to solve the technical problem in the prior art that the core pack removal relies on manual traction and has low operating efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A steam-driven water pump core-pulling auxiliary device, comprising:

[0008] A first base is provided at one end of the steam-driven water supply pump;

[0009] The translation mechanism is provided on the first base, and a stand is provided at the output end thereof, and the stand is used to fix the front end of the steam-driven water supply pump core package;

[0010] An auxiliary shaft is detachably arranged at the rear end of the steam-driven water supply pump core package;

[0011] The second base is provided at an end of the steam-driven water supply pump away from the first base;

[0012] A first lifting mechanism is provided on the second base, and a movable platform is provided at the output end thereof;

[0013] The first wheel group is rotatably mounted on the movable platform; the first wheel group is in sliding engagement with the lower surface of the auxiliary shaft;

[0014] The second lifting mechanism is arranged on the movable table, and a gantry is arranged at the output end thereof;

[0015] The second wheel set is rotatably arranged on the inner top of the gantry, and the second wheel set is in sliding fit with the upper surface of the auxiliary shaft.

[0016] Further, there are two groups of the first wheel sets, and the second wheel set is arranged between the two groups of the first wheel sets.

[0017] Further, the first wheel set includes a plurality of symmetrically arranged first rollers, a plurality of first chutes are formed on the lower surface of the auxiliary shaft, and each first roller is in sliding connection with the corresponding first chute; the second wheel set includes a plurality of second rollers, a second chute is formed on the upper surface of the auxiliary shaft, and all the second rollers are in sliding connection with the second chute.

[0018] Further, the vertical frame includes a bottom plate arranged at the output end of the translation mechanism, a vertical plate arranged on the bottom plate, and a plurality of reinforcing rib plates arranged on the side of the vertical plate facing away from the steam-driven feed pump; an avoidance through hole for the front end of the core package to pass through is formed in the center of the vertical plate, a plurality of convex blocks distributed around the avoidance through hole are arranged on the side of the vertical plate facing the steam-driven feed pump, and each convex block is provided with a radially penetrating first positioning hole, and the first positioning hole is fixedly connected with the side wall of the front end of the core package through a set screw.

[0019] Further, a plurality of second positioning holes are formed on the vertical plate and are arranged around the avoidance through hole, and the second positioning holes are fixedly connected with the front end of the core package through fasteners.

[0020] Further, a cross beam is arranged at the bottom of the movable table, the cross beam is perpendicular to the movable table, the second lifting mechanism is arranged on the cross beam, and the gantry is located above the movable table.

[0021] Further, an auxiliary support device is further included, and the auxiliary support device includes:

[0022] The third lifting mechanism is arranged at one end of the first base close to the steam-driven feed pump;

[0023] The bracket is arranged at the output end of the third lifting mechanism, and the bracket is used for supporting the lower surface of the auxiliary shaft.

[0024] Further, the end of the auxiliary shaft is connected with the rear end of the core package through a flange assembly; a concave portion matching the outer peripheral surface of the auxiliary shaft is arranged on the upper surface of the bracket, and a distance sensor is arranged on the concave portion, and the distance sensor is used for detecting the distance between the bracket and the auxiliary shaft.

[0025] Further, the third lifting mechanism includes a base, a lifting plate, a scissor assembly connecting the base and the lifting plate, and a driving cylinder arranged on the base, and the extending rod of the driving cylinder drives the scissor assembly to fold or unfold.

[0026] Further, the scissors assembly is formed by sequentially hinging a plurality of X-shaped hinged units end to end. One end of the X-shaped hinged unit at the bottom is hinged to the bottom plate, and the other end is slidably connected to the bottom plate. One end of the X-shaped hinged unit at the top is hinged to the lifting plate, and the other end is slidably connected to the lifting plate.

[0027] Beneficial effects:

[0028] The utility model provides an auxiliary device for the core pulling of a steam-driven feed water pump. Through the bidirectional fixed structure in which a translation mechanism drives a vertical frame to traction the front end of the core package and an auxiliary shaft supports the rear end of the core package, axial traction is formed. Combining the first wheel group and the second wheel group to respectively clamp the upper and lower surfaces of the auxiliary shaft to form rolling support, the smooth axial extraction of the core package is realized. The operation threshold for workers is low and the axial movement trajectory is controllable. At the same time, the risk of core package offset or sag can be avoided during the extraction process, effectively improving the core pulling efficiency and safety. Description of the drawings

[0029] Figure 1 is the structural diagram of the auxiliary device for the core pulling of the steam-driven feed water pump provided by the utility model;

[0030] Figure 2 is the schematic diagram of the core package of the auxiliary device for the core pulling of the steam-driven feed water pump provided by the utility model Figure 1 ;

[0031] Figure 3 is the schematic diagram of the core package of the auxiliary device for the core pulling of the steam-driven feed water pump provided by the utility model Figure 2 ;

[0032] Figure 4 [[ID= / / ID=28]]is the explosion diagram of the auxiliary device for the core pulling of the steam-driven feed water pump provided by the utility model;

[0033] Figure 5 is the explosion diagram of the auxiliary support device in the auxiliary device for the core pulling of the steam-driven feed water pump provided by the utility model;

[0034] Figure 6 is the cross-sectional view of the auxiliary support device in the folded state in the auxiliary device for the core pulling of the steam-driven feed water pump provided by the utility model;

[0035] Figure 7 is the side cross-sectional view of the auxiliary shaft in the auxiliary device for the core pulling of the steam-driven feed water pump provided by the utility model;

[0036] Figure 8 is the partial structural diagram of the auxiliary device for the core pulling of the steam-driven feed water pump provided by the utility model.

[0037] Reference numerals: first base 1, second base 11, translation mechanism 2, vertical frame 3, base plate 31, vertical plate 32, avoidance through hole 321, convex block 322, first positioning hole 323, set screw 324, second positioning hole 325, reinforcing rib plate 33, auxiliary shaft 4, first chute 41, second chute 42, flange assembly 43, first flange 431, second flange 432, first lifting mechanism 5, movable table 51, cross beam 52, first wheel set 6, first roller 61, second lifting mechanism 7, gantry frame 71, second wheel set 8, second roller 81, auxiliary support device 9, third lifting mechanism 91, base 911, lifting plate 912, scissor assembly 913, first connecting rod 9131, second connecting rod 9132, first pulley 9133, first slide rail 9134, second pulley 9135, second slide rail 9136, driving cylinder 914, bracket 92, recess 921, distance sensor 93;

[0038] Pump casing a, core package b. Detailed implementation manner

[0039] The present utility model provides an auxiliary device for removing the core package of a steam-driven feed water pump. To make the purpose, technical solution and effects of the present utility model clearer and more definite, the following further describes the present utility model in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0040] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, specific orientation structure and operation. Therefore, it cannot be understood as a limitation of the present utility model. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] The steam-driven feed water pump in the present utility model is a prior art. As Figure 2 , 3 shown, the steam-driven feed water pump includes a pump casing a and a core package b. The core package b is axially arranged inside the pump casing a, and the front and rear ends of the core package b are respectively fixedly connected to the pump casing a through fasteners and flanges. The diameter of the front end of the core package b is larger than that of its rear end, and it can be axially pulled out of the pump casing a.

[0042] In the above, "front" is the extraction direction of the core package b, and "rear" is opposite to the "front" direction.

[0043] Please refer to Figures 1 to 8 As shown, the present utility model provides an auxiliary device for pulling out the core package of a steam-driven feed water pump, which realizes pulling out the core package b of the steam-driven feed water pump axially to the pump casing a. Specifically, it includes: a first base 1, a translation mechanism 2, an auxiliary shaft 4, a second base 11, a first lifting mechanism 5, a first wheel set 6, a second lifting mechanism 7 and a second wheel set 8; the first base 1 is arranged at one end of the steam-driven feed water pump; the translation mechanism 2 is arranged on the first base 1, and a vertical frame 3 is arranged at its output end, and the vertical frame 3 is used to fix the front end of the core package b of the steam-driven feed water pump; the auxiliary shaft 4 is detachably arranged at the rear end of the core package b of the steam-driven feed water pump; the second base 11 is arranged at the end of the steam-driven feed water pump away from the first base 1; the first lifting mechanism 5 is arranged on the second base 11, and a movable platform 51 is arranged at its output end; the first wheel set 6 is rotatably arranged on the movable platform 51; the first wheel set 6 is in sliding fit with the lower surface of the auxiliary shaft 4; the second lifting mechanism 7 is arranged on the movable platform 51, and a portal frame 71 is arranged at its output end; the second wheel set 8 is rotatably arranged on the inner top of the portal frame 71, and the second wheel set 8 is in sliding fit with the upper surface of the auxiliary shaft 4.

[0044] During operation, as Figure 2 shown, first release the fixed connection between the core package b and the pump casing, and then drive the vertical frame 3 to move towards the front end of the core package b through the translation mechanism 2, fix the vertical frame 3 on the front end of the core package b, and at the same time install the auxiliary shaft 4 at the rear end of the core package b; start the first lifting mechanism 5 to lift the movable platform 51 so that the first wheel set 6 contacts the lower surface of the auxiliary shaft 4, and control the second lifting mechanism 7 to press down the portal frame 71 so that the second wheel set 8 contacts the upper surface of the auxiliary shaft 4, and form a clamping type rolling support for the auxiliary shaft 4 through the first wheel set 6 and the second wheel set 8; as Figure 3 shown, then the translation mechanism 2 drives the vertical frame 3 to translate in the direction away from the steam-driven feed water pump to drive the core package b to move axially, and the auxiliary shaft 4 slides under the guidance of the first wheel set 6 and the second wheel set 8 to realize restricting the circumferential (or radial) movement of the core package b. During this process, the vertical frame 3 and the auxiliary shaft 4 respectively form a two-way rigid fixation on the front and rear ends of the core package b, and the multi-point rolling support of the auxiliary shaft 4, and combined with the uniform traction of the translation mechanism 2, the core package b is pulled out from the pump casing a in a stable posture. Through the above structure, the intensity of manual intervention is significantly reduced, the operation threshold for disassembling the core package b is effectively reduced, the risk of the core package b shifting or sagging is avoided, and the core pulling efficiency and safety are improved.

[0045] Preferably, the auxiliary shaft 4 is a hollow cylindrical structure, which can reduce the weight of the auxiliary shaft 4 while ensuring the rigidity of the auxiliary shaft 4, thereby reducing the load-bearing capacity of the first wheel set 6.

[0046] In a preferred embodiment, refer to Figure 1 、 8, the first set of rollers 6 is in two groups, and the second set of rollers 8 is arranged between the two groups of the first set of rollers 6. The two groups of the first set of rollers 6 and one group of the second set of rollers 8 form a triangular support layout, effectively restricting the offset of the auxiliary shaft 4 in the horizontal and vertical directions and ensuring the attitude stability of the core package b during the movement process.

[0047] Further, referring to Figure 8 , the first set of rollers 6 includes a plurality of symmetrically arranged first rollers 61. A plurality of first chutes 41 are formed on the lower surface of the auxiliary shaft 4, and each first roller 61 is slidably connected to the corresponding first chute 41; the second set of rollers 8 includes a plurality of second rollers 81. A second chute 42 is formed on the upper surface of the auxiliary shaft 4, and all the second rollers 81 are slidably connected to the second chute 42. Specifically, each set of the first set of rollers 6 is provided with two first rollers 61, and each first roller 61 is embedded in the corresponding first chute 41 to form an axial movement constraint. The second set of rollers 8 is provided with two second rollers 81 arranged at intervals along the axial direction of the auxiliary shaft 4, and the two second rollers 81 are simultaneously embedded in the second chute 42. By providing four first rollers 61 and two second rollers 81 located between the first rollers 61, a stable clamping type rolling support is formed for the auxiliary shaft 4, so that the auxiliary shaft 4 bears radial limit and axial traction force simultaneously during the movement process, effectively suppressing the swing or deflection of the core package b during the movement and improving the stability of the core pulling process.

[0048] In a preferred embodiment, referring to Figure 4 , the vertical frame 3 includes a bottom plate 31 arranged at the output end of the translation mechanism 2, a vertical plate 32 arranged on the bottom plate 31, and a plurality of reinforcing rib plates 33 arranged on the side of the vertical plate 32 facing away from the steam-driven feed pump. Through the above settings, the rigidity of the structure of the vertical frame 3 is improved to ensure that the vertical frame 3 can drive the core package b to move axially; a relief through hole 321 for the front end of the core package b to pass through is formed in the center of the vertical plate 32. A plurality of bumps 322 distributed around the relief through hole 321 are arranged on the side of the vertical plate 32 facing the steam-driven feed pump. Each bump 322 is provided with a radially penetrating first positioning hole 323, and the first positioning hole 323 is fixedly connected to the side wall of the front end of the core package b through a set screw 324. Among them, the positions of a plurality of first positioning holes 323 correspond to the hoisting threaded holes on the side wall of the front end of the core package b. The set screw 324 screwed into the first positioning hole 323 forms a threaded fastening connection with the hoisting threaded hole, thereby realizing rigid fixation of the vertical frame 3 and the front end of the core package b. The above structure utilizes the original hoisting threaded hole positions of the core package b to achieve rapid positioning and installation, which not only ensures the reliability of force transmission but also reduces the additional processing requirements.

[0049] It should be noted that the front end of the core package b is fixedly connected to the pump housing a through fasteners. Among them, the fasteners include studs screwed to the pump housing a and nuts screwed to the studs. A plurality of studs are arranged on the pump housing a in a circumferential array. The studs pass through the front end of the core package b and are connected to the nuts to achieve stable installation of the core package b. Therefore, when disassembling, the nuts need to be unscrewed, and the studs can be retained on the pump housing. When the core package b is axially pulled out, the core package b is separated from the studs.

[0050] To increase the contact area between the vertical plate 32 and the front end of the core package b, further referring to Figure 4 , a number of second positioning holes 325 are provided on the vertical plate 32 around the avoidance through holes 321. Among them, each second positioning hole 325 corresponds to the position of the stud one by one; the second positioning holes 325 are fixedly connected to the front end of the core package b through fasteners. In specific implementation, the front end of the core package b passes through the avoidance through holes 321, and the side surface of the vertical plate 32 is closely attached to the end face of the front end of the core package b. At this time, each stud on the pump housing a just penetrates into the corresponding second positioning hole 325. In the early stage of pulling out the core package b, the first positioning hole 323 is first fixed by the set screw 324 connected to the lifting threaded hole. The translation mechanism 2 pulls the core package b to move axially until the studs on the pump housing a are completely separated from the front end of the core package b; in the middle stage of pulling out the core package b, 4 to 6 second positioning holes 325 are selected to be second-fixed to the front end of the core package b through fasteners, and at the same time, the connection between the first positioning hole 323 and the lifting threaded hole is released, so that the lifting threaded hole returns to a free state. The above structure switches the fixed points in stages, which not only uses the second positioning holes 325 to improve the connection stability between the vertical frame 3 and the front end of the core package b, but also releases the lifting threaded hole to provide a standard interface for the subsequent lifting equipment, realizing seamless connection between the core extraction and transfer processes.

[0051] Among them, the fasteners are bolt nuts.

[0052] In the above, the translation mechanism 2 is a ball screw drive structure, which can drive the vertical frame 3 to reciprocate horizontally to realize pulling the core package b to move axially.

[0053] In the above, both the first lifting mechanism 5 and the second lifting mechanism 7 are cylinder-driven lifting structures, realizing that the first lifting mechanism 5 drives the movable platform 51 to move up and down, and the second lifting mechanism 7 drives the gantry frame 71 to move up and down.

[0054] In a preferred embodiment, referring to Figure 7 、 8, a cross beam 52 is provided at the bottom of the movable table 51. The cross beam 52 is vertically arranged with respect to the movable table 51. The second lifting mechanism 7 is arranged on the cross beam 52, and the gantry 71 is located above the movable table 51. Preferably, the second lifting mechanism 7 is composed of two double-rod cylinders, and the two double-rod cylinders are respectively arranged at both ends of the cross beam 52. The extending rod of one double-rod cylinder is connected to one side edge of the gantry 71. Since the cross beam 52 is vertically arranged with respect to the movable table 51, when the movable table 51 moves up and down, the position interference between the first lifting mechanism 5 and the second lifting mechanism 7 can be avoided.

[0055] During operation, the second lifting mechanism 7 lifts the gantry 71 to expand the shaft-passing space formed between the gantry 71 and the movable table 51, facilitating the lateral insertion of the auxiliary shaft 4; after the shaft insertion is completed, the second lifting mechanism 7 presses down the gantry 71, driving the second wheel set 8 to move downward until the second roller 81 is embedded in the second chute 42 of the auxiliary shaft 4. The rapid installation and stable support of the auxiliary shaft 4 are achieved through segmented lifting control.

[0056] In a preferred embodiment, referring to Figure 4 , 5 , 6, it further includes an auxiliary support device 9. The auxiliary support device 9 is used to support the position of the auxiliary shaft 4 near the rear end of the core package b; by adding the auxiliary support device 9, the middle support after the core package b is extracted is increased, avoiding the generation of bending moment at the connection between the core package b and the auxiliary shaft 4. The auxiliary support device 9 includes a third lifting mechanism 91 and a bracket 92; the third lifting mechanism 91 is arranged at one end of the first base 1 close to the steam-driven feed pump; the bracket 92 is arranged at the output end of the third lifting mechanism 91, and the bracket 92 is used to support the lower surface of the auxiliary shaft 4. When the core package b is pulled by the translation mechanism 2 until it is completely separated from the pump casing a, the third lifting mechanism 91 is activated to drive the bracket 92 to rise, so that the bracket 92 contacts the lower surface of the auxiliary shaft 4.

[0057] Furthermore, referring to Figure 4 , 5The end of the auxiliary shaft 4 is connected to the rear end of the core package b via a flange assembly 43 to form a detachable rigid connection. Specifically, the flange assembly 43 includes a first flange 431 provided at the rear end of the core package b and a second flange 432 provided at the front end of the auxiliary shaft 4. The first flange 431 and the second flange 432 are fixedly connected by bolts and nuts. The upper surface of the bracket 92 is provided with a recess 921 that matches the outer circumference of the auxiliary shaft 4. The recess 921 is provided with a distance sensor 93 for detecting the distance between the bracket 92 and the auxiliary shaft 4. The provision of the recess 921 increases the contact area between the bracket 92 and the auxiliary shaft 4 and effectively suppresses radial deviation of the auxiliary shaft 4. In actual application, when the recess 921 is in contact with the auxiliary shaft 4, the distance value detected by the distance sensor 93 is set to a preset value. In the next operation, the third lifting mechanism 91 drives the bracket 92 to move upward, and the distance sensor 93 detects the distance between the bracket 92 and the auxiliary shaft 4 in real time. When the detected distance value reaches the preset value, it is determined that the bracket 92 has reached the target support height.

[0058] In addition, when transporting the core package b, after the connection between the core package b and the auxiliary shaft 4 is released, the auxiliary shaft 4 remains in a stable placement posture under the cooperative support of the bracket 92, the first wheel group 6 and the second wheel group 8, which is conducive to the reconnection of the auxiliary shaft 4 with the core package b after the inspection is completed.

[0059] It should be noted that, in actual use, when the third lifting mechanism 91 is used to drive the bracket 92 to move up and down to achieve auxiliary support for the auxiliary shaft 4, several studs that interfere with the movement of the bracket 92 need to be removed from the pump housing a.

[0060] In one embodiment, when there is sufficient installation space between the front end of the core package b and the first base 1, the third lifting mechanism 91 can adopt a cylinder-driven lifting structure.

[0061] In another embodiment, see Figure 5 、 6 When the distance between the front end of the core package b and the first base 1 is small, and insufficient installation space is provided, the third lifting mechanism 91 adopts a compact scissor lift design. Specifically, it includes a base 911, a lifting plate 912, a scissor assembly 913 connecting the base 911 and the lifting plate 912, and a driving cylinder 914 disposed on the base 911. The extension rod of the driving cylinder 914 drives the scissor assembly 913 to fold or unfold. The bracket 92 is mounted on the lifting plate 912. When the extension rod of the driving cylinder 914 retracts, the scissor assembly 913 folds to lower the overall height of the auxiliary support device 9 and prevent positional interference between the bracket 92 and the front end of the core package b. After the core package b is withdrawn, the extension rod of the driving cylinder 914 extends to drive the scissor assembly 913 to unfold, driving the bracket 92 upward.

[0062] Specifically, referring to Figure 5 , the scissor assembly 913 is formed by sequentially hinging a number of X-shaped hinged units end to end. In this embodiment, there are three groups of X-shaped hinged units. Each group of X-shaped hinged units includes a first link 9131 and a second link 9132 that are cross-hinged with each other. The lower end of the second link 9132 of the X-shaped hinged unit at the bottom is hinged to the bottom plate 31. The lower end of the first link 9131 is slidably connected to the first slide rail 9134 of the bottom plate 31 through a first pulley 9133. The upper end of the first link 9131 of the X-shaped hinged unit at the top is hinged to the lifting plate 912. The upper end of the second link 9132 is slidably connected to the second slide rail 9136 of the lifting plate 912 through a second pulley 9135. The extending rod of the driving cylinder 914 is hinged to the sliding end of the X-shaped hinged unit. When the driving cylinder 914 expands and contracts, the overall expansion or folding of the scissor assembly 913 is realized through the linkage of each X-shaped hinged unit one by one.

[0063] In summary, the present utility model drives the vertical frame 3 to traction the core package b to move axially through the translation mechanism 2, connects the rear end of the core package b through the auxiliary shaft 4, and realizes the stable extraction of the core package b under the rolling support of the first wheel set 6 and the second wheel set 8, ensuring the stability of the axial movement of the core package b, reducing the intensity of manual intervention, and improving the core extraction efficiency and safety; two groups of first wheel sets 6 are provided and the second wheel set 8 is arranged in the middle. The first wheel set 6 contacts the lower surface of the auxiliary shaft 4, and the second wheel set 8 contacts the upper surface of the auxiliary shaft 4, improving the balance of the movement of the auxiliary shaft 4 and at the same time avoiding the risk of deviation of the auxiliary shaft 4; by adding an auxiliary support device 9, after the core package b is extracted, it plays an auxiliary support role at the connection between the core package b and the auxiliary shaft 4, preventing the generation of bending moment at the connection, and at the same time achieving the purpose of stably supporting the auxiliary shaft 4 after disconnecting from the core package b, which is beneficial to the reconnection of the auxiliary shaft 4 and the core package b after maintenance.

[0064] It can be understood that for those of ordinary skill in the art, equivalent replacements or changes can be made according to the technical solution of the present utility model and its inventive concept, and all such changes or replacements should fall within the protection scope of the claims attached to the present utility model.

Claims

1. An auxiliary device for the core extraction package of a steam-driven feed water pump, characterized in that, Comprising: A first base (1), provided at one end of the steam-driven feed pump; A translation mechanism (2), provided on the first base (1), with a vertical frame (3) provided at its output end, and the vertical frame (3) is used to fix the front end of the steam-driven feed pump core package; An auxiliary shaft (4), detachably provided at the rear end of the steam-driven feed pump core package; A second base (11), provided at the end of the steam-driven feed pump away from the first base (1); A first lifting mechanism (5), provided on the second base (11), with a movable table (51) provided at its output end; A first wheel set (6), rotatably provided on the movable table (51); the first wheel set (6) is in sliding fit with the lower surface of the auxiliary shaft (4); A second lifting mechanism (7), provided on the movable table (51), with a gantry frame (71) provided at its output end; A second wheel set (8), rotatably provided at the inner top of the gantry frame (71), and the second wheel set (8) is in sliding fit with the upper surface of the auxiliary shaft (4).

2. The auxiliary device for the core extraction package of the steam-driven feed water pump according to claim 1, characterized in that There are two sets of the first wheel sets (6), and the second wheel set (8) is provided between the two sets of the first wheel sets (6).

3. The auxiliary device for the core extraction package of the steam-driven feed water pump according to claim 1, characterized in that, The first wheel set (6) includes a number of symmetrically arranged first rollers (61), and a number of first chutes (41) are formed on the lower surface of the auxiliary shaft (4), and each first roller (61) is slidably connected to the corresponding first chute (41); the second wheel set (8) includes a number of second rollers (81), and a second chute (42) is formed on the upper surface of the auxiliary shaft (4), and all the second rollers (81) are slidably connected to the second chute (42).

4. The auxiliary device for the core pulling package of the steam-driven feed water pump according to claim 1, characterized in that, The vertical frame (3) includes a bottom plate (31) provided at the output end of the translation mechanism (2), a vertical plate (32) vertically provided on the bottom plate (31), and a number of reinforcing rib plates (33) provided on the side of the vertical plate (32) facing away from the steam-driven feed pump; an avoidance through hole (321) for the front end of the core package to pass through is formed at the center of the vertical plate (32), and a number of protrusions (322) distributed around the avoidance through hole (321) are provided on the side of the vertical plate (32) facing the steam-driven feed pump, and each protrusion (322) is provided with a radially penetrating first positioning hole (323), and the first positioning hole (323) is fixedly connected to the side wall of the front end of the core package through a set screw (324).

5. The auxiliary device for the core extraction package of the steam-driven feed water pump according to claim 4, characterized in that A number of second positioning holes (325) are formed on the vertical plate (32) around the avoidance through hole (321), and the second positioning holes (325) are fixedly connected to the front end of the core package through fasteners.

6. The auxiliary device for the core extraction package of the steam-driven feed water pump according to claim 1, characterized in that, A cross beam (52) is provided at the bottom of the movable table (51), the cross beam (52) is vertically arranged with the movable table (51), the second lifting mechanism (7) is provided on the cross beam (52), and the gantry frame (71) is located above the movable table (51).

7. The auxiliary device for the core pulling package of the steam-driven feed water pump according to claim 1, wherein An auxiliary support device (9) is further included, and the auxiliary support device (9) includes: A third lifting mechanism (91), provided at the end of the first base (1) close to the steam-driven feed pump; A bracket (92), provided at the output end of the third lifting mechanism (91), and the bracket (92) is used to support the lower surface of the auxiliary shaft (4).

8. The auxiliary device for the core pulling package of the steam-driven feed water pump according to claim 7, characterized in that, The end of the auxiliary shaft (4) is connected to the rear end of the core package through a flange assembly (43); a concave portion (921) matching the outer peripheral surface of the auxiliary shaft (4) is provided on the upper surface of the bracket (92), and a distance sensor (93) is provided on the concave portion (921), and the distance sensor (93) is used to detect the distance between the bracket (92) and the auxiliary shaft (4).

9. The auxiliary device for the core pulling package of the steam-driven feed water pump according to claim 7, characterized in that, The third lifting mechanism (91) includes a base (911), a lifting plate (912), a scissor assembly (913) connecting the base (911) and the lifting plate (912), and a driving cylinder (914) provided on the base (911), and the extending rod of the driving cylinder (914) drives the scissor assembly (913) to fold or unfold.

10. The auxiliary device for the core pulling package of the steam-driven feed water pump according to claim 9, characterized in that, The scissor assembly (913) is formed by sequentially hinging a plurality of X-shaped hinged units end to end. One end of the X-shaped hinged unit at the bottom is hinged to the bottom plate (31), and the other end is slidably connected to the bottom plate (31). One end of the X-shaped hinged unit at the top is hinged to the lifting plate (912), and the other end is slidably connected to the lifting plate (912).

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