Novel core-penetrating screw rod and mounting method

Abstract

The invention relates to the technical field of core penetrating screws, in particular to a novel core penetrating screw and an installation method.The novel core penetrating screw comprises a core penetrating rod, nuts and an auxiliary part, screw heads are arranged at the two ends of the core penetrating rod, the nuts are connected to the outer sides of the screw heads in a threaded mode, and an alkali-free glass fiber tape soaked with dipping glue is wound around the outer side of the core penetrating rod; the nut is screwed through the adjusting wrench, and it can be ensured that the nut is stably positioned and restrained by the limiting block in the clamping groove. Due to the design, even if equipment is vibrated during operation, the nut cannot be loosened, and the safety and stability of equipment operation are ensured; after the equipment is installed and started, due to vibration, the ball can swing irregularly under the action of the anti-vibration spring. The swing is beneficial for preventing the ball from moving into the sliding groove, so that the possible adverse effect of vibration on the orientation spring is reduced to the greatest extent. The mechanism ensures that the limiting block can be continuously and stably fixed in the clamping groove.

Description

Technical Field

[0001] The invention relates to the technical field of core-penetrating screw rods, in particular to a novel core-penetrating screw rod and an installation method thereof. Background Art

[0002] In many hydroelectric generators in my country, the stator through-core screws are axially threaded through the screw holes in the stator laminations, applying axial force to ensure the stable fixation of the stator core. However, actual conditions show that during generator operation, due to severe vibration and long-term operation, the tightening force of some through-core screws gradually weakens. This increases friction between the screw and the stator core, causing the original insulating coating on the screw surface to wear and fall off, reducing the insulation performance of the through-core screw. In addition, severe vibration can cause the connecting nuts to loosen. Despite the implementation of anti-loosening measures such as washers, these measures are still difficult to maintain their tightening effect in the long term under the influence of continuous vibration. Summary of the Invention

[0003] In view of the above problems in the prior art, the present invention is proposed.

[0004] Therefore, the object of the present invention is to provide a novel core-penetrating screw.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a new core-penetrating screw, comprising a core-penetrating rod, a nut and an auxiliary component;

[0006] Wherein, both ends of the through-core rod are provided with screw heads, the nut is threadedly connected to the outside of the screw heads, and the outside of the through-core rod is wound with an alkali-free glass fiber tape soaked in impregnated glue.

[0007] As a preferred solution of the novel core-penetrating screw rod of the present invention, an insulating tube is sleeved on the outer side of the core-penetrating rod, and a guide tube is sleeved on the outer side of the core-penetrating rod, and the guide tube is located at the top end of the insulating tube.

[0008] As a preferred solution of the novel through-core screw of the present invention, a sliding cavity is provided inside the nut, a sliding groove is provided on the outer wall of the sliding cavity, and an installation cavity is provided on the inner wall of the sliding cavity.

[0009] As a preferred solution of the new through-core screw of the present invention, the sliding cavity is internally slidably connected with a connecting rod, one end of the connecting rod is fixedly connected to a limiting block, the limiting block extends out of the sliding cavity, and the connecting rod is set to an L shape.

[0010] As a preferred solution of the new through-core screw of the present invention, a circular hole is opened inside the sliding cavity, a shock-proof spring is fixedly connected inside the circular hole, a ball is fixedly connected to one end of the shock-proof spring, and the ball is located at one end of the connecting rod.

[0011] As a preferred solution of the new through-core screw of the present invention, a shock-proof spring is provided inside the installation cavity, one end of the shock-proof spring is connected to the bottom surface of the installation cavity, and the other end of the shock-proof spring is connected to the outer side of the connecting rod.

[0012] As a preferred solution of the new through-core screw rod of the present invention, the auxiliary parts include steel washers, insulating washers and butterfly springs, and the steel washers, insulating washers and butterfly springs cooperate with the nut to tighten the through-core rod for stability.

[0013] As a preferred solution of the new through-core screw of the present invention, wherein: a protrusion is fixedly connected to the outer side of the butterfly spring closest to the nut, and the protrusions are arranged in multiple groups, and a slot is formed between each two groups of protrusions;

[0014] Wherein, the protrusion is arranged in a fan shape.

[0015] The present invention also provides an installation method.

[0016] In order to solve the above technical problems, the present invention also provides the following technical solutions: an installation method, including the new core-penetrating screw and the following operating steps:

[0017] First, the core screw is made of silver-bright round steel 42CrMo, with a total length of 2370±2mm. The surface is coated with two-component impregnating glue HDJ-138, and the alkali-free glass fiber tape is half-wound around the screw polished rod section, and the surface is painted with 9120 paint.

[0018] The hole at the upper end of the through-core screw is placed in the direction close to the iron core. First, place a layer of steel washers, then two layers of insulating washers, then a layer of steel washers, and then three sets of spring washers in combination. Then, place the insulating tube and the guide tube into the hole in turn, and finally tighten it with a nut.

[0019] The hole at the lower end of the through-core screw is installed in the direction close to the iron core. First, place a layer of steel washers, then two layers of insulating washers, then a layer of steel washers, and then a single set of spring washers in combination. Then, place the insulating tube and guide tube into the hole in turn, and finally tighten it with a nut.

[0020] As a preferred solution of the installation method of the present invention, after tightening the nut, the two ends of the through-core screw are cleaned, and after cleaning, F-class insulating red enamel is applied to the ends of the through-core screw including the washer, nut and screw to prevent dust, oil and other pollutants from entering the installation hole along the installation gap, which will cause the insulation of the through-core screw to decrease again.

[0021] Beneficial effects of the present invention: Tightening the nut with an adjusting wrench can ensure that the limit block firmly positions and constrains the nut in the slot. This design ensures that the nut will not loosen even if the equipment encounters vibration during operation, ensuring the safety and stability of the equipment operation. After the equipment is installed and started, due to vibration, the ball will swing irregularly under the action of the shock-proof spring. This swing helps prevent the ball from shifting into the slide groove, thereby minimizing the adverse effects that vibration may have on the orientation spring. This mechanism ensures that the limit block can be continuously and stably fixed in the slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0023] Figure 1 It is an overall schematic diagram of the present invention.

[0024] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0025] Figure 3 It is a schematic diagram of the interior of the nut of the present invention.

[0026] Figure 4 It is a schematic diagram of the butterfly spring of the present invention. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0030] Example 1

[0031] Reference Figures 1 to 4, which is the first embodiment of the present invention, provides a new core-penetrating screw, including a core-penetrating rod 100, a nut 200 and an auxiliary component 300;

[0032] The two ends of the core rod 100 are provided with screw heads 101 , the nut 200 is threadedly connected to the outside of the screw head 101 , and the outside of the core rod 100 is wrapped with an alkali-free glass fiber tape soaked in impregnated glue.

[0033] Specifically, an insulating tube 100 a is sleeved on the outer side of the core rod 100 , and a guide tube 100 b is sleeved on the outer side of the core rod 100 . The guide tube 100 b is located at the top end of the insulating tube 100 a .

[0034] Furthermore, a sliding cavity 201 is defined inside the nut 200 , a sliding groove 202 is defined on an outer wall of the sliding cavity 201 , and an installation cavity 203 is defined on an inner wall of the sliding cavity 201 .

[0035] Preferably, a connecting rod 201a is slidably connected to the interior of the sliding cavity 201, one end of the connecting rod 201a is fixedly connected to a limiting block 201b, the limiting block 201b extends out of the interior of the sliding cavity 201, and the connecting rod 201a is set to be L-shaped.

[0036] It should be noted that a circular hole is opened inside the sliding cavity 201, and a shock-proof spring 201a-1 is fixedly connected inside the circular hole. One end of the shock-proof spring 201a-1 is fixedly connected to a ball 201a-2, and the ball 201a-2 is located at one end of the connecting rod 201a.

[0037] Preferably, a shockproof spring 201a-1 is provided inside the installation cavity 203, one end of the shockproof spring 201a-1 is connected to the bottom surface of the installation cavity 203, and the other end of the shockproof spring 201a-1 is connected to the outer side of the connecting rod 201a.

[0038] Furthermore, the auxiliary component 300 includes a steel washer 301 , an insulating washer 302 and a butterfly spring 303 . The steel washer 301 , the insulating washer 302 and the butterfly spring 303 cooperate with the nut 200 to tighten the through rod 100 to ensure stability.

[0039] Preferably, a protrusion 303a is fixedly connected to the outer side of the butterfly spring 303 closest to the nut 200, and the protrusions 303a are arranged in multiple groups, and a slot 303b is formed between every two groups of protrusions 303a;

[0040] The bump 303a is configured in a fan shape.

[0041] When the nut 200 needs to be tightened for the final tightening, the adjusting wrench is gradually controlled to squeeze the ball 201a-2, and finally the adjusting wrench is clamped on the outer wall of the nut 200. Then the nut 200 is rotated to gradually squeeze the butterfly spring 303 and finally complete the tightening.

[0042] When the adjusting wrench is controlled to gradually squeeze the ball 201a-2, the ball 201a-2 will be driven to fit against one end of the connecting rod 201a under the action of squeezing, and the connecting rod 201a will be driven to slide inside the sliding cavity 201. At the same time, the sliding connecting rod 201a will stretch the return spring 202c. When the ball 201a-2 is completely located inside the sliding groove 202, it will drive the limit block 201b at one end of the connecting rod 201a to be located at the top of the butterfly spring 303 where the protrusion 303a is not set. In this way, when the nut 200 is subsequently rotated to squeeze the butterfly spring 303, the limit block 201b will be prevented from being blocked by the protrusion 303a and unable to be tightened.

[0043] When the nut 200 is fully tightened, the butterfly spring 303 becomes horizontal under the action of squeezing. At this time, the adjusting wrench is removed, and the connecting rod 201a will be reset under the elasticity of the reset spring 202c, thereby driving the limit block 201b at the bottom end of the connecting rod 201a to slide into the slot 303b formed by the two groups of protrusions 303a. The nut 200 can be fixed by the engagement of the limit block 201b with the slot 303b. In this way, vibration of the equipment will not cause the nut 200 to loosen, ensuring that the equipment is in a safe and stable operating state.

[0044] If the adjusting wrench is removed, the limit block 201b will be blocked by the protrusion 303a and will slide into the slot 303b. After adjusting the wrench, it will be clamped on the outer wall of the nut 200 where the ball 201a-2 is not set, and slightly adjusted until the ball 201a-2 is reset. At this time, the limit block 201b is clamped in the slot 303b. This method can facilitate personnel to operate the equipment more conveniently.

[0045] When the protrusions 303a are designed to be fan-shaped, it can be ensured that the slots 303b formed by each set of protrusions 303a are rectangular, and the limiting block 201b can be stably engaged in the slots 303b.

[0046] In summary, when the adjusting wrench is used to tighten the nut 200, the stopper 201b will be able to effectively position and restrain the nut 200 within the slot 303b. This prevents the nut 200 from loosening even if the device is subjected to continuous vibration during operation, thereby ensuring that the device remains safe and stable.

[0047] Example 2

[0048] Reference Figures 1 to 4 , which is the second embodiment of the present invention, based on the previous embodiment,

[0049] When using an adjusting wrench to squeeze the ball 201a-2, it needs to be kept level with the center of the circular hole inside the connecting rod 201a, otherwise the ball 201a-2 will be deflected under the elasticity of the shock-proof spring 201a-1 and cannot be squeezed into the slide groove 202.

[0050] The above can ensure that after the nut 200 is installed, it can avoid the situation where the ball 201a-2 is squeezed by accidental touch and the nut 200 becomes loose.

[0051] When the equipment is installed and put into operation, the vibration generated will drive the ball 201a-2 to swing irregularly in conjunction with the elasticity of the shock-proof spring 201a-1, thereby effectively preventing the ball 201a-2 from moving into the slide groove 202, thereby minimizing the impact of the vibration on the return spring 202c and ensuring that the limit block 201b can be stably connected to the inside of the slot 303b.

[0052] In summary, by tightening the nut 200 with an adjusting wrench, it is possible to ensure that the limit block 201b firmly positions and constrains the nut 200 in the slot 303b. This design ensures that even if the device encounters vibration during operation, the nut 200 will not loosen, thereby ensuring the safety and stability of the device operation. After the device is installed and started, due to vibration, the ball 201a-2 will swing irregularly under the action of the shockproof spring 201a-1. This swing helps prevent the ball 201a-2 from shifting into the chute 202, thereby minimizing the adverse effects that the vibration may have on the orientation spring 202c. Such a mechanism ensures that the limit block 201b can be continuously and stably fixed in the slot 303b.

[0053] Example 3

[0054] Reference Figures 1 to 4 , which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides an installation method, including a new core screw, and the following operating steps:

[0055] First, the core screw is made of silver-bright round steel 42CrMo, with a total length of 2370±2mm. The surface is coated with two-component impregnating glue HDJ-138, and the alkali-free glass fiber tape is half-wound around the screw polished rod section, and the surface is painted with 9120 paint.

[0056] The hole at the upper end of the through-core screw is placed in the direction close to the iron core. First, place a layer of steel washers, then two layers of insulating washers, then a layer of steel washers, and then three sets of spring washers in combination. Then, place the insulating tube and the guide tube into the hole in turn, and finally tighten it with a nut.

[0057] The hole at the lower end of the through-core screw is installed in the direction close to the iron core. First, place a layer of steel washers, then two layers of insulating washers, then a layer of steel washers, and then a single set of spring washers in combination. Then, place the insulating tube and guide tube into the hole in turn, and finally tighten it with a nut.

[0058] Specifically, after tightening the nut, clean both ends of the through-core screw. After cleaning, apply F-class insulating red enamel to the ends of the through-core screw, including the washer, nut, and screw, to prevent dust, oil and other pollutants from entering the installation hole along the installation gap, which will cause the insulation of the through-core screw to decrease again.

[0059] In summary, the method of applying F-class insulating red enamel on the end is adopted to seal the hole at the end of the through-core screw to prevent dust, oil and other pollutants from entering the installation hole along the installation gap, thereby preventing the insulation of the through-core screw from being reduced again.

[0060] Compared with the original core screw insulation coating layer, the use of alkali-free glass fiber tape as the insulation material has the advantages of good insulation performance and high temperature resistance, which can make the motor obtain superior insulation performance, extend the service life of the motor and reduce the weight of the motor.

Claims

1. A new type of core screw, characterized by: It comprises a core-penetrating rod (100), a nut (200) and an auxiliary component (300); Wherein, both ends of the through rod (100) are provided with screw heads (101), the nut (200) is threadedly connected to the outside of the screw head (101), and the outside of the through rod (100) is wound with an alkali-free glass fiber tape soaked in impregnated glue.

2. The novel through-core screw according to claim 1, characterized in that: An insulating tube (100a) is sleeved on the outer side of the core-penetrating rod (100), and a guide tube (100b) is sleeved on the outer side of the core-penetrating rod (100), wherein the guide tube (100b) is located at the top end of the insulating tube (100a).

3. The novel through-core screw as claimed in claim 2 is characterized in that: A sliding cavity (201) is provided inside the nut (200), a sliding groove (202) is provided on the outer wall of the sliding cavity (201), and an installation cavity (203) is provided on the inner wall of the sliding cavity (201).

4. The novel through-core screw as claimed in claim 3 is characterized in that: The interior of the sliding cavity (201) is slidably connected with a connecting rod (201a), one end of the connecting rod (201a) is fixedly connected to a limiting block (201b), the limiting block (201b) extends out of the interior of the sliding cavity (201), and the connecting rod (201a) is arranged in an L shape.

5. The novel through-core screw as claimed in claim 4 is characterized in that: A circular hole is provided inside the sliding cavity (201), a shockproof spring (201a-1) is fixedly connected inside the circular hole, a round ball (201a-2) is fixedly connected to one end of the shockproof spring (201a-1), and the round ball (201a-2) is located at one end of the connecting rod (201a).

6. The novel through-core screw as claimed in claim 5, characterized in that: An anti-vibration spring (201a-1) is arranged inside the installation cavity (203), one end of the anti-vibration spring (201a-1) is connected to the bottom surface of the installation cavity (203), and the other end of the anti-vibration spring (201a-1) is connected to the outer side of the connecting rod (201a).

7. The novel through-core screw as claimed in claim 6, characterized in that: The auxiliary component (300) comprises a steel washer (301), an insulating washer (302) and a butterfly spring (303), and the steel washer (301), the insulating washer (302) and the butterfly spring (303) cooperate with the nut (200) to tighten the stability of the through rod (100).

8. The novel through-core screw according to claim 7, characterized in that: A protrusion (303a) is fixedly connected to the outer side of the butterfly spring (303) closest to the nut (200), and the protrusions (303a) are arranged in multiple groups, and a slot (303b) is formed between every two groups of the protrusions (303a); Wherein, the protrusion (303a) is configured in a fan shape.

9. An installation method, characterized in that: The invention comprises the novel core-penetrating screw described in any one of claims 1 to 8, and the following operating steps: First, the core screw is made of silver-bright round steel 42CrMo, with a total length of 2370±2mm. The surface is dipped in two-component impregnation glue HDJ-138, and the alkali-free glass fiber tape is half-wound on the screw polished rod section, and 9120 paint is brushed on the surface; The hole at the upper end of the through-core screw is placed in the direction close to the iron core by first placing a layer of steel washers, then two layers of insulating washers, then a layer of steel washers, and then three sets of spring washers in combination, and then the insulating tube and the guide tube are placed into the hole in turn, and finally fastened with nuts; The hole at the lower end of the through-core screw is installed in the direction close to the iron core by first placing a layer of steel washers, then two layers of insulating washers, then a layer of steel washers, and then a single set of spring washers in combination, and then the insulating tube and the guide tube are placed into the hole in turn, and finally tightened with a nut.

10. The installation method according to claim 9, characterized in that: After tightening the nut, clean both ends of the through-core screw. After cleaning, apply F-class insulating red varnish to the ends of the through-core screw, including the washers, nuts, and screws, to prevent dust, oil and other contaminants from entering the installation hole along the installation gap, which would cause the insulation of the through-core screw to decrease again.

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