CN216161952U - Grounding rod torque limiting device - Google Patents

Abstract

The utility model relates to the technical field of grounding rods, in particular to a grounding rod torque limiting device which comprises a torque limiter, a sleeve and a handle, wherein two ends of the torque limiter are respectively connected with the sleeve and the handle, the first end of the sleeve is connected with the torque limiter, the second end of the sleeve is used for being connected with an insulating operating rod of a grounding rod, the first end of the handle is connected with the torque limiter, and the second end of the handle is formed into an operating part. The grounding rod torque limiting device provided by the utility model can ensure that the torque reaches the standard requirement in the process of installing the grounding wire by maintainers, and ensures that the stress at the grounding position is moderate, so that the convenience in disassembly is ensured, the potential safety hazard of the falling of the grounding wire is eliminated, and the reliable grounding is ensured.

Description

Grounding rod torque limiting device

Technical Field

The utility model relates to the technical field of ground rods, in particular to a torque limiting device for a ground rod.

Background

The ground rod, namely the rod type ground wire, consists of an insulating operating rod and a wire clamp, is an important tool for ensuring workers when voltage accidentally appears on a power-off line, and is mainly used for power-off maintenance work of a power transmission line.

Along with the continuous expansion of electric power construction scale, the operation and maintenance work task of the transmission line is heavy day by day, and the installation of the grounding wire is one of the most important technical measures for ensuring the safety of the power failure maintenance work, and particularly strict control is required. The unreliable ground wire is easily installed in the power failure maintenance process to cause safety accidents, so that serious personnel and property losses are caused.

In relevant regulations, a special wire clamp is required to be used for fixing the grounding wire on the conductor, the wire clamp is required to be firmly fixed, the minimum fastening torque of the wire clamp reaches 8 N.m, the mounting fastening torque is not required to be larger than 12 N.m, and the standard reaching rate of the mounting torque of the grounding wire is 100%. However, due to the fact that visual bolt fastening torque display is not available, the problem that fastening torque is too large or too small often occurs only by means of hand feeling of maintainers to screw bolts, and the risk of infirm installation in the process of installing the grounding wire is increased.

It can be seen that the existing ground rod has no function of prompting the installation torque, cannot quantitatively determine whether the spiral torque reaches the standard when the ground is hung, cannot ensure the ground wire hanging reliability, and cannot meet the working requirement of ensuring the ground wire to be firmly hung (namely the standard reaching rate of the installation torque of the ground wire is 100%).

SUMMERY OF THE UTILITY MODEL

The utility model provides a grounding rod torque limiting device for solving the technical problem that fastening torque is too large or too small frequently during grounding operation of a grounding rod in the prior art.

The technical scheme of the utility model is as follows:

a ground rod torque limiting device comprising:

the torque limiter is connected with the sleeve and the handle at two ends respectively;

the first end of the sleeve is connected with the torque limiter, and the second end of the sleeve is used for connecting an insulating operating rod of a grounding rod;

a grip, a first end of the grip being connected to the torque limiter, a second end of the grip forming an operating portion.

Furthermore, two symmetrical notches are formed in the side wall of the sleeve, and after the insulating operating rod is inserted into the sleeve, the sleeve and the insulating operating rod are locked through the locking assembly.

Further, the lock catch assembly comprises a lock catch, a movable rod, an adjusting nut and a handle, the lock catch is of an annular structure with an opening, a first limit edge and a second limit edge are respectively and outwards extended at two ends of the opening, the movable rod penetrates through the first limit edge and the second limit edge, the adjusting nut is in threaded connection with a first end of the movable rod, a second end of the movable rod is connected with an eccentric shaft in the handle, the handle winds the eccentric shaft, the first limit edge and the second limit edge move in opposite directions, and the sleeve and the insulating operating rod are clamped tightly by the lock catch.

Further, a nylon cushion is fixed on the inner wall of the sleeve.

Further, the torque limiter is a friction type torque limiter.

Furthermore, friction formula torque limiter includes driving shaft and driven shaft, it has the friction disc to compress tightly between driving shaft and the driven shaft, the driving shaft is connected the handle, the driven shaft is connected the sleeve pipe.

Further, the driven shaft is hollow columnar structure, the one end of driven shaft is connected the sleeve pipe, the other end of driven shaft is equipped with the through-hole, the driving shaft includes limiting plate and perpendicular to the double-screw bolt of limiting plate, the double-screw bolt passes from the driven shaft is inside behind the through-hole with the handle is connected, the friction disc includes first friction disc and second friction disc, first friction disc is disposed the limiting plate with between the interior bottom surface of through-hole department on the driven shaft, the second friction disc is disposed between the outer bottom surface of through-hole department and the fastening component on the driven shaft.

Further, the fastening assembly comprises a pressure plate, a butterfly washer, a lock washer and a lock nut which are sequentially pressed, and the pressure plate presses the second friction plate.

Furthermore, a torque prompting structure is further arranged in the torque limiter, and when the driving shaft and the driven shaft rotate relatively, the torque prompting structure sends a prompting signal.

Further, moment of torsion suggestion structure includes pawl and ratchet groove, the pawl is disposed on the limiting plate and can rotate around the pivot on the limiting plate, the ratchet groove is formed on the inner wall of driven shaft, still be equipped with stop screw on the limiting plate and be used for reseing the elastic component of pawl, the driving shaft with when relative rotation takes place for the driven shaft, the pawl is in wind earlier under the drive in ratchet groove the pivot is rotatory, then resets under the effect of elastic component, hits the beating stop screw sends the suggestion sound.

After the technical scheme is adopted, compared with the prior art, the grounding rod torque limiting device provided by the utility model has the following beneficial effects:

1. according to the utility model, one end of the torque limiter is connected with the grounding rod, and the other end of the torque limiter is operated to rotate, so that the standard requirement of fastening torque can be met, the fastening is not carried out after the torque limiter reaches an action value, the grounding part is ensured to be stressed moderately, and the phenomenon of over-tightening or over-loosening can not occur, so that the convenience in disassembly is ensured, the potential safety hazard of falling of the grounding wire is eliminated, and the reliable grounding is ensured.

2. According to the utility model, the sleeve and the insulating operating rod are locked through the locking assembly, holes do not need to be formed in the insulating operating rod, the original structure of the insulating operating rod cannot be damaged, the original effective insulating length of the grounding wire cannot be changed, the insulating property is ensured, and the structure is more convenient to mount and dismount. Adopt hasp subassembly locking sleeve pipe and insulating bar, insulating bar each point atress is the same, and the atress is even stable, and is very little to insulating bar intensity influence. In addition, the structure is suitable for ground rods with different voltage levels and has certain universality.

3. The friction type torque limiter is adopted in the torque limiter, the durability of the friction type torque limiter is high, and good torque precision can be still ensured after the friction type torque limiter is used for multiple times. The torque limiter is also internally provided with a torque prompt structure of the pawl and the ratchet groove, and the torque prompt structure is a pure mechanical structure, does not need an external power supply, and has high signal accuracy and good stability.

Drawings

FIG. 1 is a schematic diagram illustrating an installation and use of the grounding rod torque limiting device of the present embodiment;

FIG. 2 is a front view of the ground bar torque limiting device of the present embodiment;

fig. 3 is a schematic structural diagram of the ground bar torque limiting device of the present embodiment from another view angle;

FIG. 4 is an exploded view of the installation of the nylon cushion and latch assembly of this embodiment;

FIG. 5 is a schematic structural diagram of the locking assembly of the present embodiment;

FIG. 6 is a schematic structural diagram of the driving shaft of the present embodiment at a first viewing angle;

FIG. 7 is a schematic structural diagram of the driving shaft of the present embodiment at a second viewing angle;

FIG. 8 is a schematic structural view of the driven shaft of the present embodiment;

FIG. 9 is an exploded view of the installation of the driving shaft and the driven shaft of the present embodiment;

fig. 10 is a top view of the torque indicating structure of the present embodiment.

Wherein the content of the first and second substances,

the ground rod torque limiting device 1, the torque limiter 11, the driving shaft 111, the limiting plate 1111, the stud 1112, the shaft shoulder 1113, the driven shaft 112, the through hole 1121, the first friction plate 113, the second friction plate 114, the fastening assembly 115, the pressure plate 1151, the belleville washer 1152, the lock washer 1153, the lock nut 1154, the pawl 1161, the ratchet groove 1162, the rotating shaft 1163, the limiting screw 1164 and the elastic member 1165; sleeve 12, notch 121, nylon pad 122; a grip 13; the locking component 14, the locking buckle 141, the opening 1411, the first limit edge 1412, the second limit edge 1413, the movable rod 142, the adjusting nut 143, the handle 144 and the eccentric shaft 145;

the grounding rod 2, the insulating operating rod 21 and the wire clamp 22.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1-2, the present embodiment provides a ground rod torque limiting device, which includes a torque limiter 11, a sleeve 12 and a handle 13, wherein the sleeve 12 and the handle 13 are respectively connected to two ends of the torque limiter 11, specifically, a first end of the sleeve 12 is fixedly connected to a first end of the torque limiter 11, and a second end of the sleeve 12 is used for connecting an insulating operating rod 21 of the ground rod 2; a first end of the grip 13 is fixedly connected to a second end of the torque limiter 11, and a second end of the grip 13 is formed as a rotation operation portion.

In this way, in the present embodiment, the insulating operating rod 21 of the ground rod 2 is connected through the sleeve 12, during the grounding operation, the operator holds the insulating operating rod 21 lightly with his left hand and rotates the grip 13 with his right hand, and when the fastening torque of the front end clamp 22 of the ground rod 2 is smaller than the action value of the torque limiter 11, the insulating operating rod 21 rotates along with the grip 13 and continues fastening; when the fastening torque of the wire clamp 22 at the front end of the ground rod 2 reaches an action value, the sleeve 12 slides with the grip 13, at this time, the grip 13 continues to rotate, the insulating operating rod 21 cannot rotate along with the grip 13, and the fastening torque cannot be too large, so that the fastening torque of the wire clamp 22 is the action value of the torque limiter 11. The action value of the torque limiter 11 can be set as required, if the action value is set to be 10N m, the standard requirement of fastening torque can be met, fastening is not performed after the action value is reached, the ground connection part is guaranteed to be stressed moderately, the phenomenon of over-tightening or over-loosening is avoided, convenience in disassembly is guaranteed, the potential safety hazard that the ground wire falls is eliminated, and reliable grounding is guaranteed.

The insulating operating rod 21 and the sleeve 12 are connected, namely the insulating operating rod 21 and the sleeve 12 are relatively fixed and can correspond to holes formed in the insulating operating rod 21 and the sleeve 12, the insulating operating rod 21 is sleeved in the sleeve 12 and then fastened through a pin or a bolt, however, the overall insulativity of the insulating operating rod 21 is damaged, the insulating operating rod 21 is stressed unevenly and is easy to damage, and in addition, the sleeve 12 of the connecting mode can only be matched with the insulating operating rod 21 of one size and is not universal.

As shown in fig. 2-4, the sleeve 12 is fixed by the locking assembly 14 in this embodiment, specifically, the sleeve 12 is made of metal, and two symmetrical notches 121 are formed on the sidewall of the sleeve to facilitate the insertion and clamping of the insulating operating rod 21. After the dielectric operating rod 21 is inserted into the casing 12, the casing 12 is locked with the dielectric operating rod 21 at the position of the orifice of the casing 12 by the locking assembly 14. In this embodiment, the nylon pad 122 is further fixed on the inner wall of the sleeve 12, and the nylon pad 122 has the characteristics of low hardness, high brittleness, small elastic deformation, high wear resistance and the like, so that on one hand, a large static friction force is generated when the nylon pad is connected with the insulating operating rod 21, and on the other hand, the insulating operating rod 21 is not damaged.

Further, as shown in fig. 5, the latch assembly 14 includes a latch 141, a movable rod 142, an adjusting nut 143, and a handle 144, wherein the latch 141 is in a ring structure having an opening 1411 for being sleeved on the casing 12, a first limit edge 1412 and a second limit edge 1413 are respectively extended outwardly from two ends of the opening 1411, the movable rod 142 passes through the first limit edge 1412 and the second limit edge 1413, the first end of the movable rod 142 is connected with the adjusting nut 143 by a thread, the second end of the movable rod 142 is connected to an eccentric shaft 145 in the handle 144, and when the handle 144 rotates around the eccentric shaft 145, a distance between a center of the eccentric shaft 145 and the second limit edge 1413 is gradually increased, so that the distance between the first limit edge 1412 and the second limit edge 1413 moving towards each other is gradually decreased, thereby generating a radial pressure on the casing 12 to deform the casing 12 to clamp the insulating operation rod 21.

Like this, this embodiment locks sleeve pipe 12 and insulating bar 21 through locking Assembly 14, need not to trompil on insulating bar 21, can not destroy insulating bar 21's original structure, can not change the original insulating effective length of earth connection, guarantee insulating properties, and this device does not have the influence of security to this kind of structure installation is dismantled more conveniently. The insulating operating rod 21 is made of epoxy resin materials, the influence on the strength of the insulating operating rod 21 after connection is small as much as possible, the insulating operating rod 21 and the locking sleeve 12 are locked in the mode, all points of the insulating operating rod 21 are stressed the same, stress is uniform and stable, and the influence on the strength of the insulating operating rod 21 is small. In addition, in the structure, the distance between the first limiting edge 1412 and the second limiting edge 1413 can be adjusted in advance through the adjusting nut 143, the insulating operating rods 21 with various outer diameter sizes can be adapted within a certain range, the sleeve 12 does not need to be replaced, the grounding rod structure is suitable for grounding rods 2 with different voltage classes, and certain universality is achieved.

Preferably, the torque limiter 11 is a friction type torque limiter, which has high durability and can ensure high torque precision after being used for multiple times. The friction type torque limiter comprises a driving shaft 111 and a driven shaft 112, wherein a friction plate is pressed between the driving shaft 111 and the driven shaft 112, the driving shaft 111 is connected with a handle 13, and the driven shaft 112 is connected with a sleeve 12.

Specifically, as shown in fig. 6 to 9, the driven shaft 112 of the present embodiment has a hollow cylindrical structure, one end of which is open for connecting the sleeve 12, and the other end of which is provided with a through hole 1121; the driving shaft 111 comprises a limit plate 1111 and a stud 1112 perpendicular to the limit plate 1111, the stud 1112 penetrates through a through hole 1121 from one end of the driven shaft 112 and then is connected with the grip 13, and a shoulder 1113 is arranged on the stud 1112 and is in sliding fit with the through hole 1121. The friction plates of the present embodiment include a first friction plate 113 and a second friction plate 114, the first friction plate 113 is disposed between the limiting plate 1111 and the inner bottom surface of the driven shaft 112 at the through hole 1121, and the second friction plate 114 is disposed between the outer bottom surface of the driven shaft 112 at the through hole 1121 and the fastening assembly 115. The fastening assembly 115 comprises a pressure plate 1151, a belleville washer 1152, a lock washer 1153 and a lock nut 1154 which are sequentially pressed, the pressure plate 1151 is pressed against the second friction plate 114 and the limiting plate 1111 is pressed against the first friction plate 113 through locking of the lock nut 1154, and the torque action value of locking can be adjusted through the lock nut 1154. When the torque applied to the grip 13 is less than 10N · m, the first friction plate 113 and the second friction plate 114 still press the driven shaft 112, so that the driving shaft 111 and the driven shaft 112 are kept relatively static; when the torque applied to the grip 13 is greater than 10N · m, the first friction plate 113 and the second friction plate 114 slide with the driven shaft 112, and at this time, the grip 13 continues to rotate, and the driven shaft 112 does not rotate along with the driving shaft 111, so that the fastening torque of the ground rod 2 can be ensured within a set range.

The torque limiter 11 of the embodiment is further provided with a torque prompting structure, and when the driving shaft 111 and the driven shaft 112 rotate relatively, that is, when the fastening torque of the ground rod 2 reaches a set value, the torque prompting structure sends a prompting signal to prompt an operator to be hooked in place. Specifically, as shown in fig. 7, 8 and 10, the torque prompting structure includes a pawl 1161 and a ratchet groove 1162, the pawl 1161 is disposed on an outer end surface of the limit plate 1111, a rotating shaft 1163 is further fixed on the outer end surface, an axis of the rotating shaft 1163 does not coincide with an axis of the limit plate 1111, the rotating shaft 1163 in this embodiment is a polished rod position of the screw, a circular hole is formed in the pawl 1161 and sleeved at the polished rod position, and the pawl 1161 can rotate around the rotating shaft 1163 and is limited by a head of the screw and the limit plate 1111 in a vertical direction; ratchet grooves 1162 are formed on the inner wall of the driven shaft 112, and rotation of the ratchet grooves 1162 forces the pawls 1161 to rotate about the rotating shafts 1163. Furthermore, in this embodiment, a limit screw 1164 is further disposed on the outer end surface of the limit plate 1111, an elastic member 1165 for resetting the pawl 1161 is further sleeved on the rotating shaft 1163, the elastic member 1165 may be a torsion spring or a wound iron wire, one end of the elastic member 1165 is fixed to the limit screw 1164, the other end of the elastic member 1165 is fixed to the tail end of the pawl 1161, and when the driving shaft 111 and the driven shaft 112 are relatively stationary, the tail end of the pawl 1161 abuts against the limit screw 1164 under the action of the elastic member 1165; when the driving shaft 111 and the driven shaft 112 rotate relatively, as shown in fig. 10, the limit plate 1111 rotates counterclockwise, the pawl 1161 rotates around the rotating shaft 1163 by a small angle under the action of the ratchet groove 1162, and then resets under the action of the elastic member 1165, and hits the limit screw 1164 to generate a prompt sound. The torque prompt structure of this embodiment is pure mechanical structure, need not external power to signal accuracy is high, stability is good.

It should be noted that, in the present embodiment, the sleeve 12 and the torque limiter 11 may be fixed by welding or glue, so as to ensure that the sleeve 12 and the torque limiter 11 do not rotate relatively; the locking assembly 14 of the present embodiment needs to ensure that the static friction force between the nylon pad 122 and the insulating operation rod 21 after locking is greater than the action value set by the torque limiter 11, for example, set to 15N · m; the grip 13 and the torque limiter 11 of the present embodiment can also be fixed by welding or screwing with auxiliary glue, so as to ensure that the grip 13 and the torque limiter 11 do not rotate relatively, and the grip 13 can be provided with leather patterns, which is convenient for operation.

Therefore, the grounding rod torque limiting device provided by the embodiment can ensure that the torque reaches the standard requirement in the process of installing the grounding wire by maintainers, ensure that the stress at the grounding position is moderate, meet the working requirement of 100% of the standard rate of the installation torque of the grounding wire and eliminate the potential safety hazard of falling of the grounding wire.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims (10)

1. A ground rod torque limiting device, comprising:

the torque limiter (11), both ends of the torque limiter (11) are respectively connected with a sleeve (12) and a handle (13);

a sleeve (12), wherein a first end of the sleeve (12) is connected with the torque limiter (11), and a second end of the sleeve (12) is used for connecting an insulating operating rod (21) of a grounding rod (2);

a grip (13), wherein a first end of the grip (13) is connected with the torque limiter (11), and a second end of the grip (13) is formed as an operation part.

2. The ground rod torque limiting device of claim 1, characterized in that the side wall of the sleeve (12) is provided with two symmetrical notches (121), and after the insulating operating rod (21) is inserted into the sleeve (12), the sleeve (12) and the insulating operating rod (21) are locked by a locking assembly (14).

3. The ground rod torque limiting device of claim 2, wherein said latch assembly (14) includes a latch (141), a movable rod (142), an adjustment nut (143), and a handle (144), the lock catch (141) is of an annular structure with an opening (1411), two ends of the opening (1411) are respectively provided with a first limiting edge (1412) and a second limiting edge (1413) in an outward extension manner, the movable rod (142) passes through the first limit edge (1412) and the second limit edge (1413), the first end of the movable rod (142) is connected with an adjusting nut (143) through screw threads, a second end of the movable rod (142) is connected to an eccentric shaft (145) in the handle (144), the first limit edge (1412) and the second limit edge (1413) move towards each other when the handle (144) rotates around the eccentric shaft (145), the lock catch (141) clamps the sleeve (12) and the insulating operating rod (21).

4. A ground rod torque limiting device according to claim 1 or 2 or 3, characterized in that a nylon washer (122) is fixed to the inner wall of the sleeve (12).

5. The ground rod torque limiting device of claim 1, characterized in that said torque limiter (11) is a friction type torque limiter.

6. The ground rod torque limiting device according to claim 5, characterized in that the friction type torque limiter comprises a driving shaft (111) and a driven shaft (112), a friction plate is pressed between the driving shaft (111) and the driven shaft (112), the driving shaft (111) is connected with the handle (13), and the driven shaft (112) is connected with the sleeve (12).

7. The ground rod torque limiting device of claim 6, wherein the driven shaft (112) is of a hollow cylindrical configuration, one end of the driven shaft (112) is connected with the sleeve (12), the other end of the driven shaft (112) is provided with a through hole (1121), the driving shaft (111) comprises a limit plate (1111) and a stud (1112) vertical to the limit plate (1111), the stud (1112) passes through the through hole (1121) from the inside of the driven shaft (112) and then is connected with the handle (13), the friction plates include a first friction plate (113) and a second friction plate (114), the first friction plate (113) is arranged between the limit plate (1111) and the inner bottom surface of the driven shaft (112) at the through hole (1121), the second friction plate (114) is arranged between an outer bottom surface of the driven shaft (112) at the through hole (1121) and a fastening assembly (115).

8. The ground bar torque limiting device of claim 7, wherein said fastening assembly (115) comprises a pressure plate (1151), a belleville washer (1152), a lock washer (1153) and a lock nut (1154) which are compressed in sequence, said pressure plate (1151) compressing said second friction plate (114).

9. The ground rod torque limiting device according to claim 7 or 8, characterized in that a torque prompting structure is further arranged in the torque limiter (11), and when the driving shaft (111) and the driven shaft (112) rotate relatively, the torque prompting structure sends a prompting signal.

10. The ground rod torque limiting device according to claim 9, wherein the torque prompting structure comprises a pawl (1161) and a ratchet groove (1162), the pawl (1161) is configured on the limiting plate (1111) and can rotate around a rotating shaft (1163) on the limiting plate (1111), the ratchet groove (1162) is formed on the inner wall of the driven shaft (112), a limiting screw (1164) and an elastic member (1165) for resetting the pawl (1161) are further arranged on the limiting plate (1111), when the driving shaft (111) and the driven shaft (112) rotate relatively, the pawl (1161) rotates around the rotating shaft (1163) under the driving of the ratchet groove (1162) and then resets under the action of the elastic member (1165), and the limiting screw (1164) is hit to generate a prompting sound.

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