Wrench for balance weight of steam turbine

Abstract

The utility model discloses a turbine balance weight wrench which comprises a handle, a tightening part and a positioning part. The tightening part is arranged at the end of the handle, the pin is rotationally fixed to the opening of the concave hole through the tightening part, the positioning part is arranged at the end of the handle, penetrates through the middle of the tightening part and extends to the outside of the tightening part, and therefore the balance block can be placed on the wrench through the positioning part. In the debugging process, an operator firstly places the balance block on the positioning part and sends the balance block into the concave hole, then the operator places the pin on the positioning part, and the pin is fixed to the concave hole in a threaded fit mode till the pin abuts against the balance block in the concave hole, so that the assembling operation is completed, the whole operation process is simple and convenient, and the assembling efficiency is improved. And the tightening part is made of steel, so that the hardness of the tightening part is improved, and the serious consequence that the pin falls into a closed cylinder due to breakage of the head of the wrench is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steam turbine technical field, specifically, a steam turbine balance block wrench. BACKGROUND

[0002] Steam turbine is also called steam turbine engine, which is a kind of rotary steam power device. High-temperature and high-pressure steam is injected into the blade after passing through the fixed nozzle to become accelerated airflow, which makes the rotor with blade row rotate and does work to the outside. Steam turbine is the main equipment of modern thermal power plant, and is also used in metallurgical industry, chemical industry and ship power device.

[0003] Steam turbine is composed of rotating part and static part. The rotor includes main shaft, impeller, moving blade and coupling. The static part includes inlet portion, cylinder, partition plate, static blade, steam seal and bearing. When adjusting the balance block for axial balance during the final test run and fine adjustment of the steam turbine installed in the power plant, the dynamic balance block needs to be installed on the impeller in the closed cylinder to realize the dynamic balance adjustment of the impeller. However, since there is only a small window on the closed cylinder, and the distance between the window and the installation position of the impeller is far, the operator is not suitable for adjusting the balance block, and the head of the wrench is broken during operation, which falls into the closed cylinder. If it is not taken out in time, it will cause damage to the entire steam turbine rotor and cause serious consequences. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a steam turbine balance block wrench to solve the technical problem that the head of the wrench is broken during operation due to the small window on the closed cylinder, the distance between the window and the installation position of the impeller is far, the operator is not suitable for adjusting the balance block, and the head of the wrench is broken during operation, which falls into the closed cylinder. If it is not taken out in time, it will cause damage to the entire steam turbine rotor and cause serious consequences.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a steam turbine balance block wrench, comprising:

[0006] Handle;

[0007] Tightening part, the tightening part is located at the end position of the handle, and the tightening part is made of steel material;

[0008] Positioning part, the positioning part is arranged at the end position of the handle, and penetrates the middle position of the tightening part and extends to the outside of the tightening part.

[0009] Further, the Rockwell hardness of the tightening part is greater than HRC45.

[0010] Further, the cross-sectional shape of the tightening part is in the form of a single word.

[0011] Furthermore, the positioning part has a cylindrical structure.

[0012] Furthermore, the outer peripheral wall of the positioning part is formed with a threaded structure.

[0013] Furthermore, in the length direction of the handle, the ratio between the length of the positioning part and the length of the tightening part is greater than 2.

[0014] Furthermore, the handle is longer than 2 meters and has a cylindrical structure.

[0015] Furthermore, the outer peripheral wall of the handle has friction protrusions, which are spaced apart along the axial direction of the handle.

[0016] Furthermore, the balance block wrench also includes:

[0017] An auxiliary bushing has a square outer periphery and a circular hole in the middle. The handle passes through the circular hole, and the outer periphery of the auxiliary bushing is configured to be fixed to the window of an external device.

[0018] Furthermore, the balance block wrench also includes:

[0019] A torque measuring device is fixed to the end of the handle away from the tightening part. When the handle rotates, the torque measuring device is used to measure whether the torque of the handle is between 100 and 120 Nm.

[0020] Furthermore, the balance block wrench also includes a suspension tightening mechanism, which includes:

[0021] The suspension bracket has a first support rod and a second support rod, which are fixed in a cross-shaped structure, and the first support rod and / or the second support rod are used to fix to an external platform.

[0022] A fixing plate is disposed on the first support rod and / or the second support rod;

[0023] A lifting rod, wherein the lifting rod is vertically arranged and one end of the lifting rod is fixedly connected to the fixing plate;

[0024] A clamping fixture is disposed on the end of the lifting rod away from the fixed plate, and the clamping fixture is used to clamp the handle.

[0025] Furthermore, the suspension tightening mechanism also includes:

[0026] A servo motor is arranged on the clamping fixture, the servo motor is connected with the end of the handle, and the servo motor is used to drive the handle to rotate.

[0027] Compared with the prior art, the application has the following technical effects:

[0028] The application sets the tightening part at the end of the handle, rotates and fixes the pin at the opening position of the recess hole by the tightening part, sets the positioning part at the end position of the handle and extends through the middle position of the tightening part to the outside of the tightening part, so that the balancing block can be placed on the wrench by the positioning part. During debugging, the operator first places the balancing block on the positioning part, slowly inserts the handle into the small window of the cylinder, aligns the recess hole position, and sends the balancing block into the recess hole. Then the operator places the pin on the positioning part, and the clamping groove at the end of the pin is matched with the tightening part. After the pin is aligned with the recess hole, the operator rotates the handle to make the pin and the recess hole threadedly matched and fixed, until the pin abuts against the balancing block in the recess hole, the assembly operation is completed, the overall operation process is simple, and the hardness of the tightening part is improved because the tightening part is made of steel, so that the serious consequences of the head of the wrench breaking and the pin falling into the closed cylinder are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0030] Fig. 1 is a structural schematic view of the balancing block wrench according to the embodiment of the present application;

[0031] Fig. 2 is a structural schematic view of the balancing block wrench in use according to the embodiment of the present application

[0032] Fig. 3 is a front view of the balancing block wrench according to the embodiment of the present application;

[0033] Fig. 4 is a structural schematic view of the auxiliary shaft sleeve according to the embodiment of the present application;

[0034] Fig. 5 is a structural schematic view of the suspension tightening mechanism according to the embodiment of the present application;

[0035] Fig. 6 is a structural schematic view of the suspension tightening mechanism according to the embodiment of the present application.

[0036] Reference signs:

[0037] 100, balance block wrench; 10, handle; 20, tightening part; 30, positioning part; 40, auxiliary shaft sleeve; 50, round hole; 60, balance block; 70, pin; 80, hanging bracket; 81, first supporting rod; 82, second supporting rod; 91, fixed plate; 92, lifting rod; 93, clamping jig; 94, servo motor. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0040] It should also be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or can have a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can have a middle element.

[0041] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0042] In combination Figs. 1-6 As shown in the drawings, the technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application.

[0043] Steam turbine is also called steam turbine engine, which is a kind of rotary steam power device. High temperature and high pressure steam is injected into the blade after passing through the fixed nozzle to make the rotor with blade row rotate and do work.

[0044] The steam turbine is composed of rotating part and static part. The rotor includes main shaft, impeller, moving blade and coupling. The static part includes inlet part, cylinder, partition and static blade, steam seal and bearing. When adjusting the balance block 60 for axial balance during the final test and adjustment of the steam turbine installed in the power plant, the dynamic balance block 60 needs to be installed on the impeller in the closed cylinder to realize the dynamic balance adjustment of the impeller. However, due to the small size of the window on the closed cylinder and the long distance between the window and the installation position of the impeller, it is not suitable for the operator to adjust the balance block 60. In the operation, the head of the wrench is often broken and falls into the closed cylinder, which will cause damage to the entire steam turbine rotor and cause extremely serious consequences if not taken out in time.

[0045] Please refer to Figs. 1-4 The steam turbine balance block wrench 100 is provided to solve the technical problem that the existing steam turbine balance block wrench has only one small size window on the closed cylinder, and the distance between the window and the installation position of the impeller is far, so that the operator is not suitable for adjusting the balance block 60, and in the operation, the head of the wrench is often broken and falls into the closed cylinder, which will cause damage to the entire steam turbine rotor and cause extremely serious consequences if not taken out in time.

[0046] Please refer to Figs. 1-4 The steam turbine balance block wrench 100 is provided, which comprises a handle 10, a tightening part 20 located at the end position of the handle 10, the tightening part 20 is made of steel material, and a positioning part 30 provided at the end position of the handle 10 and extending through the middle position of the tightening part 20 to the outside of the tightening part 20.

[0047] In this embodiment, after the steam turbine is completely installed in the power plant, the impeller is completely placed in the closed cylinder, but there is a problem of dynamic imbalance after the impeller is started. The staff needs to carry out dynamic balance adjustment of the impeller and install small size balance block 60 on the unbalanced blade. In order to facilitate the installation of the balance block 60 on the blade, a recess is often needed to be preformed on the impeller, and the recess needs to be provided with internal threads, so that the staff needs to additionally rotate and fix the pin 70 in the recess to fix the balance block 60 in the recess.

[0048] In order to facilitate the staff to install the balance block 60, also avoid damage to the cylinder, the cylinder will be opened a small window of less than 100cm*100cm for dynamic balance debugging, the position of the recess is far away from the position of the small window, due to safety factors, the operator must be 1 meter away from the place to adjust the depth of the balance block 60. Because the opening of the balance block 60 is small, the operator adjusts the balance block 60 and it is not suitable, and in the operation, the head of the wrench is broken, and falls into the closed cylinder. If it is not taken out in time, it will cause damage to the whole turbine rotor, causing extremely serious consequences.

[0049] Therefore, the application sets the tightening part 20 at the end of the handle 10, rotates and fixes the pin 70 in the opening position of the recess by the tightening part 20, sets the positioning part 30 at the end position of the handle 10, and extends to the outside of the tightening part 20 through the middle position of the tightening part 20. In this way, the balance block 60 can be placed on the wrench by the positioning part 30. During the debugging process, the operator first places the balance block 60 on the positioning part 30, slowly inserts the handle 10 into the small window of the cylinder, and aligns the recess position, and then sends the balance block 60 into the recess. The operator then places the pin 70 on the positioning part 30, and the clamping groove at the end of the pin 70 is matched with the tightening part 20. After the pin 70 is aligned with the recess, the operator rotates the handle 10 to make the pin 70 and the recess screw thread matched and fixed, until the pin 70 and the balance block 60 in the recess abut, and the assembly operation is completed. The whole operation process is simple, and since the tightening part 20 is made of steel, the hardness of the tightening part 20 is improved, which avoids the serious consequences of the head of the wrench breaking and the pin 70 falling into the closed cylinder.

[0050] It can be understood that the clamping groove at the end of the pin 70 is matched with the tightening part 20, which can be in the shape of a straight line or a cross.

[0051] Specifically, the Rockwell hardness of the tightening part 20 is greater than HRC45. In the embodiment, in order to avoid the operation process simple, and since the tightening part 20 is made of steel, the hardness of the tightening part 20 is improved, which avoids the serious consequences of the head of the wrench breaking and the pin 70 falling into the closed cylinder. The Rockwell hardness of the tightening part 20 of the application is greater than HRC45, which can avoid the breakage of the tightening part 20 when the torque is between 100-120Nm.

[0052] Specifically, the cross-sectional shape of the tightening part 20 is in the shape of a straight line. In the embodiment, the tightening part 20 is arranged in the shape of a straight line to match the straight line clamping groove of the pin 70, and in the case that the operator cannot see the internal environment of the cylinder, the straight line structure is easier to quickly match with the clamping groove of the pin 70, which avoids the pin 70 from falling off.

[0053] Specifically, the positioning part 30 is a cylindrical structure. In this embodiment, in order to quickly place the balance block 60 and the pin 70 on the wrench, the positioning part 30 adopts a cylindrical structure. The operator can accurately and safely place the balance block 60 into the recess hole without being able to see the internal environment of the cylinder, thereby improving convenience.

[0054] Specifically, the outer peripheral wall of the positioning part 30 is formed with a threaded structure. In this embodiment, in order to improve the convenience of assembly, the outer peripheral wall of the positioning part 30 is formed with a threaded structure. Correspondingly, the positioning part 30 can be matched with the balance block 60 having a threaded groove. For example, during debugging, the operator first places the balance block 60 on the positioning part 30 and fixes it with the positioning part 30 by screwing. The operator slowly inserts the handle 10 into the small window of the cylinder and aligns the recess hole position, and then places the balance block 60 into the recess hole. Then, the operator rotates in the opposite direction to separate the positioning part 30 from the balance block 60. In this process, the balance block 60 is always fixed on the wrench and will not fall off during installation, thereby improving the convenience and safety of assembly.

[0055] It can be understood that after the balance block 60 is installed, the operator places the pin 70 on the positioning part 30, and the clamping groove at the end of the pin 70 is matched with the tightening part 20. After the pin 70 is aligned with the recess hole, the operator rotates the handle 10 to screw the pin 70 with the recess hole, until the pin 70 abuts against the balance block 60 in the recess hole, thereby completing the assembly operation. The overall operation process is simple, and since the tightening part 20 is made of steel, the hardness of the tightening part 20 is improved, thereby avoiding the serious consequences of the head of the wrench breaking and the pin 70 falling into the closed cylinder.

[0056] Specifically, the ratio between the length of the positioning part 30 and the length of the tightening part 20 in the length direction of the handle 10 is greater than 2. In this embodiment, in order to enable the wrench to have multiple functions, the ratio between the length of the positioning part 30 and the length of the tightening part 20 is greater than 2. In this way, the pin 70 can be placed on the positioning part 30. The diameter of the hole of the pin 70 is greater than the diameter of the positioning part 30. After the clamping groove of the pin 70 is fixed with the tightening part 20 and is aligned with the recess hole, the operator rotates the handle 10 to screw the pin 70 with the recess hole, until the pin 70 abuts against the balance block 60 in the recess hole, thereby completing the assembly operation. Then, the operator withdraws the wrench. The positioning part 30 will not be stuck with the pin 70.

[0057] Specifically, the outer peripheral wall of the handle 10 has friction protrusions (not shown in the figure), which are spaced apart along the axial direction of the handle 10. In this embodiment, in order to improve the friction of the handle 10, friction protrusions can be provided on the outer peripheral wall of the handle 10. Since the handle 10 is longer than 2 meters, multiple operators are required to operate it simultaneously. The friction protrusions are spaced apart along the axial direction of the handle 10 so that multiple operators can hold the handle 10 stably.

[0058] Specifically, the balance block wrench 100 also includes:

[0059] An auxiliary bushing 40 has a square outer periphery and a circular hole 50 in its center. The handle 10 passes through the circular hole 50. The outer periphery of the auxiliary bushing 40 is configured to be fixed to the window of an external device. In this embodiment, to improve the stability of the operator operating the wrench, an auxiliary bushing 40 is provided. The auxiliary bushing 40 has a square outer periphery and a circular hole 50 in its center. The outer periphery of the auxiliary bushing 40 is adapted and fixed to the small window of the cylinder (100cm*100cm). The handle 10 passes through the circular hole 50. In this way, the auxiliary bushing 40 can be used as a support point to make the 2-meter-long handle 10 more level.

[0060] Specifically, the balance block wrench 100 further includes a torque measuring device (not shown in the figure), which is fixed to the end of the handle 10 away from the tightening part 20. When the handle 10 rotates, the torque measuring device measures whether the torque of the handle 10 is between 100 and 120 Nm. In this embodiment, to prevent the pin 70 from damaging the impeller, the torque required to tighten the pin 70 needs to be controlled between 100 and 120 Nm. Therefore, a torque measuring device is required to facilitate the operator's use of the wrench within the 100-120 Nm range.

[0061] Please refer to Figs. 5-6 Specifically, the balance block wrench 100 further includes a suspension tightening mechanism, which includes: a suspension bracket 80, the suspension bracket 80 having a first support rod 81 and a second support rod 82, the first support rod 81 and the second support rod 82 being fixed in a cross-shaped structure, the first support rod 81 and / or the second support rod 82 being used to fix to an external platform; a fixing plate 91, the fixing plate 91 being disposed on the first support rod 81 and / or the second support rod 82; a lifting rod 92, the lifting rod 92 being vertically disposed, one end of the lifting rod 92 being fixedly connected to the fixing plate 91; and a clamping fixture 93, the clamping fixture 93 being disposed on the end of the lifting rod 92 away from the fixing plate 91, the clamping fixture 93 being used to clamp the handle 10.

[0062] In this embodiment, to facilitate tightening operations at a higher position, a suspension tightening mechanism is provided. Two first support rods 81 and two second support rods 82 are arranged in a "well" shape to fix the first support rods 81 and / or the second support rods 82 to an external platform. It is understood that the external platform can be a tripod, etc. The "well" shape structure improves the stability of the suspension bracket 80. Secondly, to facilitate the installation of the lifting rod 92, a square fixing plate 91 is added to the suspension bracket 80. One end of the lifting rod 92 is fixed to the fixing plate 91, and a clamping fixture 93 is provided at the other end of the lifting rod 92. The clamping fixture 93 is used to fix the handle 10. Furthermore, the height of the clamping fixture 93 can be adjusted by raising and lowering the lifting rod 92. Especially in cases where the window is at a high position, the operator can adjust the height of the handle 10 as needed, improving the operator's ease of operation.

[0063] Specifically, the suspension tightening mechanism further includes a servo motor 94, which is mounted on the clamping fixture 93 and connected to the end of the handle 10. The servo motor 94 drives the handle 10 to rotate. In this embodiment, to ensure a stable torque output for the handle 10, a servo motor 94 is added to the clamping fixture 93. The servo motor 94 is connected to the end of the handle 10, and the operator can control the rotation of the handle 10 by setting the torque output of the servo motor 94, precisely ensuring a constant torque output.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0065] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A steam turbine balance piston wrench characterized by, The balance block wrench includes: handle; A tightening part, located at the end of the handle, is made of steel; The positioning part is located at the end of the handle, passes through the middle of the tightening part, and extends to the outside of the tightening part.

2. The steam turbine balance piston wrench of claim 1, wherein, The positioning part has a cylindrical structure.

3. The steam turbine balance piston wrench of claim 2, wherein, The outer peripheral wall of the positioning part has a threaded structure.

4. The steam turbine balance piston wrench of claim 1, wherein, In the length direction of the handle, the ratio between the length of the positioning part and the length of the tightening part is greater than 2.

5. The steam turbine balance piston wrench of claim 1, wherein, The handle is longer than 2 meters and has a cylindrical structure.

6. The steam turbine balance piston wrench of claim 1, wherein, The outer peripheral wall of the handle has friction protrusions, which are spaced apart along the axial direction of the handle.

7. The steam turbine balance piston wrench of claim 1, wherein, The balance block wrench also includes: An auxiliary bushing has a square outer periphery and a circular hole in the middle. The handle passes through the circular hole, and the outer periphery of the auxiliary bushing is configured to be fixed to the window of an external device.

8. The steam turbine balance piston wrench of claim 1, wherein, The balance block wrench also includes: A torque measuring device is fixed to the end of the handle away from the tightening part. When the handle rotates, the torque measuring device is used to measure whether the torque of the handle is between 100 and 120 Nm.

9. The steam turbine balance piston wrench of claim 1, wherein, The balance block wrench further includes a suspension tightening mechanism, which includes: The suspension bracket has a first support rod and a second support rod, which are fixed in a cross-shaped structure, and the first support rod and / or the second support rod are used to fix to an external platform. A fixing plate is disposed on the first support rod and / or the second support rod; A lifting rod, wherein the lifting rod is vertically arranged and one end of the lifting rod is fixedly connected to the fixing plate; A clamping fixture is disposed on the end of the lifting rod away from the fixed plate, and the clamping fixture is used to clamp the handle.

10. The steam turbine balance piston wrench of claim 9, wherein, The suspension tightening mechanism also includes: A servo motor is mounted on the clamping fixture and connected to the end of the handle. The servo motor is used to drive the handle to rotate.

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