A combined grounding brush for preventing loosening of a large turbine unit

Abstract

The utility model relates to grounding brush technical field, concretely is a kind of anti-loosening combined grounding brush for large turbine unit, including head block and shell, the shell is equipped with positioning mechanism with head block, the positioning mechanism includes multiple clamping blocks and mounting block, the multiple mounting boxes of symmetrical setting are fixedly connected in the mounting block, the multiple clamping blocks of symmetrical setting are slidably connected on the mounting box, the opposite end of the clamping block is fixedly connected with the main spring of symmetrical setting, the inner wall of mounting box is fixedly connected with auxiliary spring, the utility model has the beneficial effects that: through the cooperation of main and vice articulated seat, support rod and main and vice spring, the movable space of each component is reduced, so that frequent friction phenomenon of each component is prevented, the long-term stability of shell and head block connection is guaranteed, operation and maintenance frequency and downtime are effectively reduced, and equipment operation and maintenance cost and security risk are significantly reduced.

Description

Technical Field

[0001] This utility model relates to the field of grounding brush technology, specifically a non-loosening combined grounding brush for large turbine units. Background Technology

[0002] As a core power equipment in the power and energy sectors, turbine units are prone to shaft current and static electricity accumulation due to electromagnetic induction and frictional static electricity when their rotor shafts operate at high speeds (usually above 3000 rpm). Over time, this can lead to faults such as bearing erosion and insulation aging, seriously threatening the safe operation of the unit. Grounding brushes are key components for solving this problem. Through continuous contact between the brush and the rotor shaft, shaft current and static electricity are conducted into the grounding system, achieving shaft protection. Early grounding brushes were mostly made of a single material (pure graphite or pure copper), which had the drawback of conflicting conductivity and wear resistance. Pure graphite brushes have good conductivity but are prone to wear and require frequent replacement, while pure copper brushes are wear-resistant but have high contact resistance and poor grounding effect. Therefore, combined grounding brushes have been gradually adopted. Through the design of composite materials, such as a copper-graphite mixed matrix, wear-resistant alloy layer, and modular structure, they achieve low contact resistance and have become the mainstream configuration for large turbine units.

[0003] Currently, the housing and head block of combined grounding brushes are mostly connected by bolts, usually four sets of bolts plus washers. This method has significant defects under turbine unit operating conditions. The high-frequency vibration of the turbine unit during operation will cause the friction between the bolt threads to continuously decrease. Especially the impact vibration during the start-up and shutdown of the unit can easily lead to the gradual loosening of the bolts. At the same time, the frictional heat of the brush during operation will amplify the difference in thermal expansion coefficients between the bolts and the connecting parts, further aggravating the thread clearance. This can lead to insufficient contact pressure between the brush and the rotor shaft and grounding failure, or even serious failures such as brush detachment and shaft jamming, increasing maintenance costs and safety risks. Utility Model Content

[0004] The purpose of this invention is to provide an anti-loosening combined grounding brush for large turbine units, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a combined anti-loosening grounding brush for large turbine units, comprising a head block and a housing, wherein the housing and the head block are jointly provided with a positioning mechanism, the positioning mechanism comprising multiple locking blocks and mounting blocks, wherein multiple symmetrically arranged mounting boxes are fixedly connected inside the mounting blocks, wherein symmetrically arranged clamping blocks are slidably connected to each mounting box, wherein symmetrically arranged main springs are fixedly connected to the opposite ends of each clamping block, wherein secondary springs are fixedly connected to the inner walls of each mounting box, wherein movable plates are slidably connected to the side walls of each mounting box, wherein a connecting block is fixedly connected to one end of each movable plate, wherein symmetrically arranged main hinge seats are fixedly connected to each movable plate, wherein support rods are hinged to each main hinge seat, and secondary hinge seats are fixedly connected to each clamping block at the position corresponding to the main hinge seat.

[0006] Preferably, the locking blocks are all fixedly connected to the side wall of the head block, and the mounting block is fixedly connected to the side end of the outer shell.

[0007] Preferably, the sidewall of the mounting block abuts against the sidewall of the head block, and symmetrically arranged actuating blocks are fixedly connected to the connecting block.

[0008] Preferably, all the support rods are vertically arranged.

[0009] Preferably, one end of each of the secondary springs is fixedly connected to the side end of the corresponding movable plate.

[0010] Preferably, the other end of each support rod is hinged to a corresponding secondary hinge seat.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the positioning mechanism adopts an interlocking structure to achieve a stable connection between the outer shell and the head block. Its core is to reduce the movable space of each component through the coordinated cooperation of the hinge seat, support rod, main spring and auxiliary spring, thereby preventing frequent friction between the components, ensuring the long-term stability of the connection between the outer shell and the head block, effectively reducing the frequency of operation and maintenance and downtime, and significantly reducing the operation and maintenance cost and safety hazards of the equipment. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the separation structure of the outer shell and the head block of this utility model; Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the structure of the mounting block of this utility model when the top part is cut off; Figure 5This is a cross-sectional view of the mounting box of this utility model, showing its structure separated from the top clamping block.

[0013] In the diagram: 1. Head block; 2. Outer shell; 3. Positioning mechanism; 31. Locking block; 32. Mounting block; 33. Mounting box; 34. Clamping block; 35. Main spring; 36. Secondary spring; 37. Moving plate; 38. Connecting block; 39. Main hinge seat; 40. Support rod; 41. Secondary hinge seat. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-5 The present invention provides the following technical solution: A non-loosening combined grounding brush for large turbine units includes a head block 1 and a housing 2. The housing 2 and the head block 1 are jointly provided with a positioning mechanism 3. The positioning mechanism 3 includes multiple locking blocks 31 and mounting blocks 32. Multiple mounting boxes 33 are symmetrically arranged and fixedly connected inside the mounting blocks 32. Each mounting box 33 is slidably connected with a symmetrically arranged clamping block 34. The opposite ends of the clamping blocks 34 are all fixedly connected with symmetrically arranged main springs 35. The inner walls of the mounting boxes 33 are all fixedly connected with secondary springs 36. Each side wall of the mounting boxes 33 is slidably connected with a moving plate 37. One end of the moving plate 37 is all fixedly connected with a connecting block 38. Each moving plate 37 is fixedly connected with a symmetrically arranged main hinge seat 39. Each main hinge seat 39 is hinged with a support rod 40. Each clamping block 34 is fixedly connected with a secondary hinge seat 41 at the position corresponding to the main hinge seat 39.

[0016] All locking blocks 31 are fixedly connected to the side wall of the head block 1. The mounting block 32 is fixedly connected to the side end of the outer shell 2. The side wall of the mounting block 32 abuts against the side wall of the head block 1. Symmetrically arranged toggle blocks are fixedly connected to the connecting block 38. The toggle blocks facilitate the movement of the connecting block 38 by the operator. All support rods 40 are vertically arranged. The vertically arranged support rods 40 are located between the clamping block 34 and the moving plate 37. At this time, the clamping block 34 will be pressed by the support rod 40 and cannot retract into the mounting box 33, which reduces the number of frictions between the clamping block 34 and the locking block 31. One end of the auxiliary spring 36 is fixedly connected to the side end of the corresponding moving plate 37. The auxiliary spring 36 can prevent the moving plate 37 from moving accidentally. The other end of the support rod 40 is hinged to the corresponding auxiliary hinge seat 41.

[0017] In use, holding the outer casing 2, the connecting block 38 is moved by the lever. The connecting block 38 will drive multiple moving plates 37 to move. Each moving plate 37 moving away from the mounting block 32 will cause the main hinge seat 39 to move. Simultaneously, the moving plate 37 will stretch the secondary spring 36. The movement of the main hinge seat 39 will cause one end of the support rod 40 to move as well. When one end of the support rod 40 moves, the other end of the support rod 40 will pull on the secondary hinge seat 41. The pulled secondary hinge seat 41 will then drive its corresponding... The clamping blocks 34 move, and at this time, each clamping block 34 will retract into the mounting box 33. The retracted clamping blocks 34 will collectively compress and shrink the main spring 35. At this time, there is a certain distance between the connecting block 38 and the mounting block 32. The operator inserts his finger between the mounting block 32 and the connecting block 38, so that the connecting block 38 cannot return to the direction of the mounting block 32. Then, the outer shell 2 is put on the head block 1. The outer shell 2 will drive the mounting block 32 to abut against the side wall of the head block 1. When the two abut, Workers can remove their fingers from between the mounting block 32 and the connecting block 38. At this time, the main spring 35 will cause each clamping block 34 to reset, the secondary spring 36 will cause the moving plate 37 to reset, the resetting of the moving plate 37 will drive the connecting block 38 to reset, and the resetting of the clamping blocks 34 will all engage with the corresponding locking blocks 31. The main hinge seat 39 and the secondary hinge seat 41 will drive the support rod 40 to reset to a vertical state. At this time, the clamping blocks 34 cannot reset to the inside of the mounting box 33 due to vibration because the support rod 40 is vertical. This can reduce the friction frequency with the corresponding locking blocks 31, improve the service life of each component in the positioning mechanism 3, ensure the long-term stability of the connection between the outer shell 2 and the head block 1, effectively reduce the frequency of operation and maintenance and downtime, and significantly reduce the operation and maintenance cost and safety hazards of the equipment. At this time, the outer shell 2 and the head block 1 are installed. The assembled grounding brush can then be connected to the turbine unit normally. The grounding brush can conduct shaft current and static electricity into the grounding system to achieve shaft protection. This is a known existing technology of grounding brushes and will not be elaborated further.

[0018] 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.

Claims

1. A type of anti-loosening combined grounding brush for large turbine units, characterized in that: The device includes a head block (1) and a shell (2). Both the shell (2) and the head block (1) are provided with a positioning mechanism (3). The positioning mechanism (3) includes multiple locking blocks (31) and mounting blocks (32). Multiple symmetrically arranged mounting boxes (33) are fixedly connected inside the mounting blocks (32). Symmetrically arranged clamping blocks (34) are slidably connected to each mounting box (33). Symmetrically arranged main springs (35) are fixedly connected to the opposite ends of each clamping block (34). The inner wall of the mounting box (33) is fixedly connected with a secondary spring (36). The side wall of the mounting box (33) is slidably connected with a movable plate (37). One end of the movable plate (37) is fixedly connected with a connecting block (38). The movable plate (37) is fixedly connected with a symmetrically arranged main hinge seat (39). The main hinge seat (39) is hinged with a support rod (40). The clamping block (34) is fixedly connected with a secondary hinge seat (41) at the position corresponding to the main hinge seat (39).

2. The anti-loosening combined grounding brush for large turbine units according to claim 1, characterized in that: The card blocks (31) are all fixedly connected to the side wall of the head block (1), and the mounting block (32) is fixedly connected to the side of the outer shell (2).

3. The anti-loosening combined grounding brush for large turbine units according to claim 1, characterized in that: The side wall of the mounting block (32) abuts against the side wall of the head block (1), and symmetrically arranged toggle blocks are fixedly connected to the connecting block (38).

4. The anti-loosening combined grounding brush for large turbine units according to claim 1, characterized in that: All the support rods (40) are set vertically.

5. The anti-loosening combined grounding brush for large turbine units according to claim 1, characterized in that: One end of each of the secondary springs (36) is fixedly connected to the side end of the corresponding movable plate (37).

6. The anti-loosening combined grounding brush for large turbine units according to claim 1, characterized in that: The other end of each support rod (40) is hinged to the corresponding secondary hinge seat (41).

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