Wrench special for through-flow unit stator core-penetrating screw

Abstract

The utility model discloses a special wrench for a through-flow unit stator core-penetrating screw rod, which comprises a ratchet wrench, the ratchet wrench is connected with a torsion head, the torsion head is connected with a sleeve assembly, the sleeve assembly is provided with a knob part and a crimping part, the knob part is matched with a nut of a core-penetrating screw rod assembly, and the crimping part is matched with a sleeve of the core-penetrating screw rod assembly. According to the special wrench, the ratchet wrench is adopted as a force application component, so that acting force can be conveniently applied to a nut on a center-penetrating screw rod all the time in a narrow space; the rotary knob part of the combined sleeve is used for disassembling the nut on the center-penetrating screw, and the crimping part is used for applying downward pressure to the sleeve on the center-penetrating screw, so that the laminated spring is forced to reduce the acting force on the nut, and the nut is convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the field of hydropower equipment maintenance, in particular to a special wrench for a stator through-core screw of a tubular unit. Background Art

[0002] The stator core of the bulb flow unit is made of 0.5mm thick high-quality low-loss silicon steel sheets stacked to form stator silicon steel sheets 210, wherein the stator core is fully stacked by 24 sheets, and the stator core is fixed in a double dove tail structure, with a total of 144 through-core screw assemblies 300, such as Figure 2 As shown, each through-screw assembly 300 has a through-screw 310, on which a rubber pad 320, a metal lap spring 330, a sleeve 340, a nut B350 and a spare nut A360 are arranged; after the unit has been running for a long time, the insulation of the through-screw 310 is reduced due to the accumulation of dirt such as oil and dust, and the through-screw 310 and the frame form a conductive loop, and a large current will pass through the through-screw 310, generating high temperature and melting, destroying the insulation of the stator silicon steel sheet 210, and causing a serious accident of burning the generator stator; in order to ensure the normal, safe and reliable operation of the unit, the insulation resistance of the stator core through-screw 310 must be regularly checked and processed. Since the through-screw 310 is very close to the stator wire rod end hoop and the operating space is limited, it is difficult to remove the through-screw 310, and there is a risk of damaging the wire rod, and the maintenance cost is high. However, the prior art does not have tools for on-site disassembly and assembly of the through-screw 310.

[0003] Therefore, in order to ensure the rapid overhaul and maintenance of the unit and save costs, it is necessary to develop a tool that can quickly adjust the stator core through-screw at the production site. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model proposes a special wrench for the stator through-core screw of a tubular unit, which adopts the following technical solutions:

[0005] A special wrench for a stator through-hole screw of a cross-flow unit, the special wrench is used to disassemble and assemble the through-hole screw assembly, the special wrench comprises a ratchet wrench, the ratchet wrench is connected to a torque head, the torque head is connected to a sleeve assembly, wherein the sleeve assembly has a knob portion and a crimping portion, the knob portion cooperates with the nut of the through-hole screw assembly, and the crimping portion cooperates with the sleeve of the through-hole screw assembly.

[0006] Furthermore, the knob portion is provided with an upper hexagonal groove and a lower hexagonal groove from top to bottom, and the size of the upper hexagonal groove is smaller than that of the lower hexagonal groove.

[0007] Furthermore, a hexagonal sleeve is detachably provided in the lower hexagonal groove.

[0008] Furthermore, the outer circumference of the hexagonal sleeve is a hexagonal column and has a hexagonal opening inside.

[0009] Furthermore, the hexagonal sleeve is clearance-matched with the lower hexagonal groove, and the hexagonal sleeve is connected to the lower hexagonal groove by magnetic attraction.

[0010] Furthermore, the crimping portion extends from the knob portion along the opening direction.

[0011] Furthermore, the inner diameter of the crimping portion is greater than the radius of the circumscribed circle of the lower hexagonal groove.

[0012] Furthermore, the inner surface of the crimping portion is a circular surface.

[0013] Furthermore, the ratchet wrench is connected to the torque head via a square head, and the torque head is connected to the sleeve assembly via a square head.

[0014] Furthermore, a pressing plate is provided on a side of the ratchet wrench away from the sleeve assembly.

[0015] The beneficial effects of the utility model are as follows: the special wrench of the utility model adopts the ratchet wrench as the force-applying component, which can conveniently apply force to the nut on the through-screw in a narrow space, thereby improving the convenience of operation; at the same time, a torque head is arranged on the ratchet wrench, which can control the force of disassembling and assembling the nut in real time, thereby avoiding the phenomenon of slipping and damaging the nut due to excessive force; in addition, the knob part of the combined sleeve is used to disassemble the nut on the through-screw, and the crimping part is used to apply downward pressure to the sleeve on the through-screw, thereby forcing the stack spring to reduce the force on the nut, thereby facilitating the disassembly and assembly of the nut.

[0016] Other beneficial effects of the present invention are described in the embodiments of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following is a brief description of the drawings required for the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present utility model, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0018] Figure 1 A schematic diagram showing the use status of the special wrench of the utility model;

[0019] Figure 2 A schematic diagram showing the structure of a through-screw assembly of the utility model;

[0020] Figure 3 The overall structure diagram of the special wrench of the utility model is shown;

[0021] Figure 4 A partial cross-sectional view showing that the special wrench of the utility model is not provided with a hexagonal socket;

[0022] Figure 5 A partial cross-sectional view showing that the special wrench of the utility model is provided with a hexagonal socket;

[0023] Figure 6 express Figure 4 Sectional view at point A;

[0024] Figure 7 express Figure 4 Sectional view at point B;

[0025] Figure 8 express Figure 5 Sectional view at point C in the middle;

[0026] Fig. 9 A schematic diagram showing the structure of a hexagonal sleeve of the utility model;

[0027] Fig.10 The utility model shows a schematic diagram of a special wrench having a pressing plate structure.

[0028] Explanation of the reference numerals: 100-special wrench; 110-ratchet wrench; 120-torque head; 130-sleeve assembly; 140-pressing plate; 130-combination sleeve; 131-knob part; 132-crimping part; 133-hexagonal sleeve; 1311-upper hexagonal slot; 1312-lower hexagonal slot; 200-stator; 210-stator silicon steel sheet; 300-through-screw assembly; 310-through-screw; 320-rubber pad; 330-lap spring; 340-sleeve; 350-nut B; 360-nut A. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all the connection relationships mentioned in the text do not simply refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation; the embodiments and features and technical solutions in the embodiments of the utility model can be combined with each other without conflict. In addition, the terms "first", "second", "upper end", "lower end", "inner end", "outer end", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0031] A special wrench for the stator screw of a tubular unit, refer to Figure 1-Figure 10 As shown, the special wrench 100 is used to disassemble and assemble the through-core screw assembly 300, and the special wrench 100 includes a ratchet wrench 110, and the ratchet wrench 110 has a handle. The ratchet wrench 110 is connected to a torque head 120, and the torque head 120 can observe the real-time effect. The torque head 120 is connected to a sleeve assembly 130, wherein the sleeve assembly 130 has a knob portion 131 and a crimping portion 132, and the knob portion 131 cooperates with the nut of the through-core screw assembly 300, and the nut of the through-core screw assembly 300 includes a nut A360 and a nut B350 arranged from top to bottom, and the crimping portion 132 cooperates with the sleeve 340 of the through-core screw assembly 300.

[0032] Furthermore, the knob portion 131 is provided with an upper hexagonal groove 1311 and a lower hexagonal groove 1312 from top to bottom. The size of the upper hexagonal groove 1311 is smaller than that of the lower hexagonal groove 1312. The contour of the upper hexagonal groove 1311 is adapted to the shape of the nut A360. When the nut A360 on the through-hole screw 310 is removed, only the upper hexagonal groove 1311 is adapted to the shape of the nut A360 and is used to screw the nut A360, while the larger lower hexagonal groove 1312 will not interact with the nut B350.

[0033] Furthermore, a hexagonal sleeve 133 is detachably disposed in the lower hexagonal groove 1312 , and when the hexagonal sleeve 133 is disposed in the lower hexagonal groove 1312 , it is used to remove the nut B350 on the through-thread screw 310 .

[0034] Furthermore, the outer circumference of the hexagonal sleeve 133 is a hexagonal cylinder, and the interior has a hexagonal opening, and the size of the hexagonal opening is adapted to the nut B350.

[0035] Furthermore, the hexagonal sleeve 133 is loosely matched with the lower hexagonal slot 1312 , and the hexagonal sleeve 133 is connected to the lower hexagonal slot 1312 by magnetic attraction, so that the hexagonal sleeve 133 is easy to disassemble and assemble from the lower hexagonal slot 1312 .

[0036] Furthermore, the crimping portion 132 extends from the knob portion 131 along the opening direction, and the cross section of the crimping portion 130 is in a circular ring shape.

[0037] Furthermore, the inner diameter of the crimping portion 132 is greater than the radius of the circumscribed circle of the lower hexagonal groove 1312 , and the inner surface of the crimping portion 132 is a circular ring surface, thereby ensuring that the crimping portion 132 will not interfere with the nut.

[0038] Furthermore, the ratchet wrench 110 is connected to the torque head 120 via a square head, and the torque head 120 is connected to the sleeve assembly 130 via a square head.

[0039] Furthermore, a pressing plate 140 is provided on a side of the ratchet wrench 110 away from the sleeve assembly 130 , and the pressing plate 140 enables the crimping portion 132 to apply downward pressure to the end surface of the sleeve 340 .

[0040] When the utility model is used, the torque head 120 is connected to the ratchet wrench 110, and the combined sleeve 130 is connected to the torque head 120. First, the nut A360 on the upper part of the through-core screw 310 is removed. At this time, the hexagonal sleeve 133 is not installed in the lower hexagonal groove 1312 of the knob portion 131, and the crimping portion 132 of the combined sleeve 130 is abutted against the end surface of the sleeve 340 of the through-core screw 310. By pressing the pressing plate 140 of the ratchet wrench 110, the force of the stack spring 330 acting on the nut B350 and the nut A360 through the sleeve 340 is reduced, which facilitates the screwing of the nut A on the upper side. 360; then remove the nut B350 on the lower side, at this time install the hexagonal sleeve 133 in the lower hexagonal groove 1312 of the knob part 131, and make the crimping part 132 of the combined sleeve 130 abut against the end face of the sleeve 340 of the through-core screw 310, and by pressing the pressing plate 140 of the ratchet wrench 110, the force of the stack spring 330 acting on the nut B350 through the sleeve 340 is reduced, making it easier to twist the nut B350, thereby completing the disassembly of the nut B350 and the nut A360; the special wrench 100 can also be used to tighten the nut B350 and the nut A360 on the through-core screw 310.

[0041] The special wrench 100 of the utility model adopts the ratchet wrench 110 as the force-applying component, which can conveniently apply force to the nut on the through-core screw 310 in a narrow space at all times, thereby improving the convenience of operation; at the same time, a torque head 120 is arranged on the ratchet wrench 110, which can control the force when disassembling and assembling the nut in real time, thereby avoiding the phenomenon of slipping and damaging the nut due to excessive force; in addition, the knob portion 131 of the combined sleeve 130 is used to disassemble the nut on the through-core screw 310, and the crimping portion 132 is used to apply downward pressure to the sleeve 340 on the through-core screw 310, thereby forcing the stack spring 330 to reduce the force on the nut, thereby facilitating the disassembly and assembly of the nut.

[0042] It should be noted that the above embodiments are intended to illustrate the technical solution of the utility model, and are exemplary methods of the claims of the utility model, rather than limitations on the claims. Although the above embodiments describe the utility model in detail, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A special wrench for a through-hole screw of a tubular unit stator, the special wrench (100) being used for disassembling and assembling a through-hole screw assembly (300), characterized in that: The special wrench (100) comprises a ratchet wrench (110), wherein the ratchet wrench (110) is connected to a torque head (120), and the torque head (120) is connected to a sleeve assembly (130), wherein the sleeve assembly (130) comprises a knob portion (131) and a crimping portion (132), wherein the knob portion (131) cooperates with a nut of a through-core screw assembly (300), and the crimping portion (132) cooperates with a sleeve (340) of the through-core screw assembly (300).

2. The special wrench for the stator through-hole screw of a tubular unit according to claim 1, characterized in that: The knob portion (131) is provided with an upper hexagonal groove (1311) and a lower hexagonal groove (1312) from top to bottom, and the size of the upper hexagonal groove (1311) is smaller than that of the lower hexagonal groove (1312).

3. The special wrench for the stator through-hole screw of a tubular unit according to claim 2, characterized in that: A hexagonal sleeve (133) is detachably arranged in the lower hexagonal groove (1312).

4. The special wrench for the stator through-hole screw of a tubular unit according to claim 3, characterized in that: The hexagonal sleeve (133) has a hexagonal prism on its outer circumference and a hexagonal opening inside.

5. The special wrench for the stator through-hole screw of a tubular unit according to claim 4, characterized in that: The hexagonal sleeve (133) is clearance-matched with the lower hexagonal groove (1312), and the hexagonal sleeve (133) is connected to the lower hexagonal groove (1312) by magnetic attraction.

6. The special wrench for the stator through-hole screw of a tubular unit according to claim 5, characterized in that: The crimping portion (132) extends from the rotation knob portion (131) along the opening direction.

7. The special wrench for the stator through-hole screw of a tubular unit according to claim 6, characterized in that: The inner diameter of the crimping portion (132) is greater than the radius of the circumscribed circle of the lower hexagonal groove (1312).

8. The special wrench for the stator through-hole screw of a tubular unit according to claim 7, characterized in that: The inner surface of the crimping portion (132) is a circular ring surface.

9. The special wrench for the stator through-hole screw of a tubular unit according to claim 8, characterized in that: The ratchet wrench (110) is connected to the torque head (120) via a square head, and the torque head (120) is connected to the sleeve assembly (130) via a square head.

10. The special wrench for the stator through-hole screw of a tubular unit according to any one of claims 1 to 9, characterized in that: A pressing plate (140) is provided on a side of the ratchet wrench (110) away from the sleeve assembly (130).

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