Patent Description:
A medium and large-sized device such as an electric vehicle requires a high output and large capacity power source. Thus, the medium and large-sized device generally uses a medium and large-sized battery pack in which a plurality of battery cells are electrically connected.

The plurality of battery cells may be connected by serial connection, parallel connection, or a mixed method of the serial connection and the parallel connection and maintain a stable structure against an external impact when connected, so that the medium and large-sized battery pack satisfies the high output and the large capacity required by the medium and large-sized device.

The medium and large-sized battery pack is coupled to all sorts of components such as an outer housing, an inner case, a frame for fixing, a busbar, a printed circuit board, and a heat pump by using a bolt.

The bolt coupling of the medium and large-sized battery pack requires to be exactly performed to maintain the stable structure against the external impact.

When a bolt in an inclined state is coupled, a coupled portion may be mechanically damaged. Although the coupled portion is not damaged, a gap may be generated in the coupled portion, or an unnecessary load may be applied thereto. Thus, the bolt coupled portion may be easily fatigued during usage of the medium and large-sized battery pack, and when an impact is accumulated during driving of the medium and large-sized device, the coupled portion may be quickly damaged.

The background technology of the present disclosure is disclosed in patent documents below:.

The present disclosure provides a bolting device capable of securing verticality of a bolt with respect to an object to be bolted.

In accordance with an exemplary embodiment, a bolting device includes: an operation part designed to be disposed on a table and including a screwdriver bit; a jig part designed to be disposed on the table to contact an object to be bolted in which a bolt hole is defined and including a through-hole for guiding a bolt to the bolt-hole; a guide part inserted to the through-hole, having a hollow shape to accommodate the bolt therein, having an inclined inner surface with a shape having an internal diameter that gradually decreases in a downward direction to maintain verticality of the bolt, and having a portion cut in a movement direction of the bolt so that the inner surface is elastically opened when the bolt is moved downward; and an elastic part in contact with an outer circumferential surface of the guide part to elastically support a surrounding portion of a cut portion of the guide part, wherein the guide part includes an upper body having an internal diameter equal to a head size of the bolt to contact an end of a head of the bolt; and a lower body having an internal diameter equal to a screw size of the bolt to contact a lower end of a screw of the bolt when contracted, wherein the lower body is divided into a plurality of pieces as a portion thereof is cut in the movement direction of the bolt, and the plurality of pieces of the lower body are arranged along a circumference of the upper body and spaced apart from each other.

The elastic part may include: an installation groove recessed from an inner wall of the through-hole; and an elastic spring extending in a direction crossing the movement direction of the bolt and disposed in the installation groove to protrude to the inside of the through-hole, thereby supporting a lower end of the guide part.

A plurality of installation grooves may be formed and arranged radially around the through-hole, and a plurality of elastic springs may be provided and arranged radially around the through-hole and respectively disposed in the installation grooves, wherein each of the elastic springs may have one end supported by an inner wall of the installation groove and the other end in contact with a lower end of the guide part.

The elastic part may include an elastic ring surrounding an outer circumferential surface of a lower end of the guide part.

The plurality of pieces of the lower body may be elastically supported by the elastic part, and lower ends of the plurality of pieces may be opened in a direction of being spaced apart from each other as the head of the bolt is moved downward.

A portion between an upper end and a lower end of each of the plurality of pieces of the lower body may be elastically bent.

The bolting device may further include a diagnosis part including a plurality of sensors designed to measure a length variation of each of the elastic springs of the elastic part and to calculate a strain and output a strain value, and installed on the jig part to diagnose verticality of the bolt.

According to the exemplary embodiments, the verticality of the bolt with respect to the object to be bolted may be secured while the bolt is coupled to the bolt hole such that the guide part having the inclined surface with the shape having the internal diameter gradually decreases in the downward direction is disposed in through-hole of the jig part to maintain the verticality of the bolt, and the object to be bolted is guided to the bolt hole by using the guide part.

Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention as defined in the claims. In the figures, the dimensions of layers and regions are exaggerated for clarity of illustration.

Hereinafter, embodiments of the inventive concept will be described with reference to the accompanying drawings.

<FIG> is a schematic view illustrating a bolting device in accordance with an exemplary embodiment. <FIG> is an exploded view illustrating the bolting device in accordance with an exemplary embodiment. <FIG> is a partially enlarged view illustrating the bolting device in accordance with an exemplary embodiment.

The bolting device in accordance with an exemplary embodiment will be described in detail with reference to <FIG>.

The bolting device in accordance with an exemplary embodiment includes: an operation part <NUM> disposed on a table <NUM> and including a screwdriver bit <NUM>; a jig part <NUM> disposed on the table <NUM> to contact an object to be bolted in which a bolt hole H1 is formed and including a through-hole H2 for guiding a bolt <NUM> to the bolt hole H1; a guide part <NUM> inserted to the through-hole H2, having a hollow shape to accommodate the bolt <NUM> therein, having a shape having an internal diameter that gradually decreases in a downward direction to maintain verticality of the bolt <NUM> and having an inclined inner surface, and having a portion cut in a movement direction of the bolt <NUM> so that the inner surface is elastically opened when the bolt <NUM> is moved downward; and an elastic part <NUM> contacting an outer circumferential surface of the guide part <NUM> to elastically support a surrounding portion of a cut portion S of the guide part <NUM>.

Here, the table <NUM> may have a top surface having a predetermined area so that the object to be bolted is seated thereon. The object to be bolted may be seated on the top surface of the table <NUM>. The object to be bolted may be a battery pack <NUM>. The battery pack <NUM> may include a battery pack housing <NUM> and a battery pack cover <NUM>. At least one hole may be formed through a top surface of the battery pack cover <NUM>. At least one hole may be formed through an upper end of the battery pack housing <NUM> and connected with the hole of the battery pack cover <NUM>. The bolt hole H1 may be formed as the hole of the battery pack cover <NUM> is connected with the hole of the battery pack housing <NUM>. A thread may be formed on an inner circumferential surface of the bolt hole H1. The bolt <NUM> may be screw-coupled to the bolt hole H1, and through this, the battery pack housing <NUM> and the battery pack cover <NUM> may be coupled to form the battery pack <NUM>. At least one unit battery cell may be provided in the battery pack <NUM>.

Also, the object to be bolted may include various objects in addition to the battery pack <NUM>.

The bolt <NUM> includes a head <NUM> and a screw <NUM>. One of a straight slot groove and a cross groove may be formed in a top surface of the head <NUM>. The screwdriver bit <NUM> may be inserted to the straight slot groove or the cross groove of the head <NUM>, and the head <NUM> may rotate by rotation of the screwdriver bit <NUM> and allow the screw <NUM> to rotate. The screw <NUM> may include a round bar and a spiral thread. The round bar may extend downward from a bottom surface of the head <NUM>. The thread may have a spiral shaped structure on an outer circumferential surface of the round bar. When the head <NUM> rotates by the screwdriver bit <NUM>, the screw <NUM> may also rotate in the same manner and be moved forward into the bolt hole H1 by the thread. Alternatively, the bolt <NUM> may have various structures.

The operation part <NUM> may be a manual screwdriver. The operation part <NUM> may include the screwdriver bit <NUM> and an operation part body <NUM>. For example, the screwdriver bit <NUM> may include a shank and a screwdriver tip. The screwdriver tip may be formed at a lower end of the shank. The screwdriver tip may be inserted and coupled to the straight slot groove or the cross groove defined in the head <NUM>. Alternatively, the screwdriver tip may have a shape of a cross shape, a straight shape, a rectangular shape, and a hexagonal shape. Also, the groove defined in the head <NUM> of the bolt <NUM> may have various shapes such as a cross groove shape, a straight slot groove shape, a rectangular groove shape, and a hexagonal groove shape. The shank may have an upper end detachable from the operation part body <NUM>.

The operation part <NUM> may be an electric screwdriver. When the operation part <NUM> is the electric screwdriver, a rotation motor may be disposed in the operation part body <NUM> and connected to the upper end of the shank. The rotation motor may be connected with a power supply through a predetermined line. A button may be disposed on an outer circumferential surface of the operation part body <NUM>, and as a current flows through the line by pushing the button, the rotation motor may rotate.

The operation part <NUM> may be spaced a predetermined height upward from the table <NUM> and operated by a robot arm (not shown) or a manipulator (not shown).

The jig part <NUM> may be seated on the top surface of the battery pack cover <NUM>. The jig part <NUM> may a block <NUM> and a support <NUM>. The block <NUM> may supported by the support <NUM>. A position of the block <NUM> may be adjusted in a horizontal direction by using a method of moving the support <NUM> relatively to the battery pack cover <NUM>. The support <NUM> may be moved and fixed by a predetermined robot arm or a manipulator.

The block <NUM> may have a predetermined area in the horizontal direction and a predetermined thickness in the vertical direction. The through-hole H2 may pass through a center of the block <NUM> in the vertical direction. The through-hole H2 may have an internal diameter greater than that of the bolt hole H1.

The block <NUM> may accommodate the guide part <NUM> through the though-hole H2, align a position of the guide part <NUM> to a central axis L of the bolt hole H1 in the vertical direction, and support the guide part <NUM> while the bolt <NUM> is screw-coupled to the bolt hole H1.

The guide part <NUM> may support the bolt <NUM> in the through-hole H2 and guide the bolt <NUM> to the bolt hole H1. The guide part <NUM> may have a hollow shape to accommodate the bolt <NUM> therein. The guide part <NUM> may have a shape having an internal diameter that gradually decreases in a direction from the top to the bottom thereof. Thus, the guide part <NUM> may have an inclined inner surface. Thus, the bolt <NUM> may be supported by the inner surface and maintain the verticality in the guide part <NUM>. Specifically, an end of the head of the bolt <NUM> may contact and be supported by an upper portion of the inner surface of the guide part <NUM>, and a lower end of the screw of the bolt <NUM> may contact and be supported by a lower portion of the inner surface of the guide part <NUM>. Thus, the bolt <NUM> may maintain the verticality. The guide part <NUM> may have a portion cut along the movement direction of the bolt so that the inner surface is elastically opened when the bolt <NUM> is moved downward.

Also, the guide part <NUM> may be made of a predetermined elastic material and prevent a damage such that the inner surface is contracted in a direction of being adjacent to each other or opened in a direction of being spaced apart from each other according to a position of the head <NUM> of the bolt <NUM>. Here, the predetermined elastic material may include various materials including, e.g., a silicon material, a resin material, and a plastic material.

The guide part <NUM> may include an upper body <NUM> having an internal diameter that is the same in size as a head size D<NUM> of the bolt to contact the end of the head <NUM> of the bolt <NUM> and a lower body <NUM> having an internal diameter that is the same in size as a screw size D<NUM> of the bolt to contact a lower end of the screw <NUM> of the bolt <NUM> when contracted.

The upper body <NUM> may have a hollow shape and have an internal diameter and an external diameter, which gradually decrease in a direction from the top to the bottom thereof. The upper body <NUM> may have a horizontal cross-section of a ring shape. The upper body <NUM> may have a lower end having an internal diameter equal to the head size D<NUM> of the bolt and an upper end having an internal diameter greater than that of the lower end.

The lower body <NUM> may extend downward from the lower end of the upper body <NUM>. The lower body <NUM> may be divided into a plurality of pieces as a portion thereof is cut in the movement direction of the bolt <NUM>. The plurality of pieces of the lower body <NUM> may be arranged along a circumference of the upper body <NUM> and spaced apart from each other.

When the head <NUM> of the bold <NUM> is positioned at the upper body <NUM>, the lower end of the lower body <NUM> may have the internal diameter equal to the screw size D<NUM> of the bolt <NUM>. Here, the internal diameter of the lower end of the lower body <NUM> may be expressed as a spaced distance of lower ends of the plurality of pieces of the lower body <NUM>, which are spaced apart from each other, when the head <NUM> of the bolt <NUM> is positioned at the upper body <NUM>.

Cut portions S of the lower body <NUM> may be spaced apart from each other along the circumference of the upper body <NUM> and extend from the upper end to the lower end of the lower body <NUM>. The cut portions S of the lower body <NUM> allow movements of the lower ends of the plurality of pieces of the lower body <NUM> not to be constrained.

The plurality of pieces of the lower body <NUM> may be elastically supported by the elastic part <NUM>. Here, the lower ends of the plurality of pieces of the lower body <NUM> may be opened in a direction of being spaced apart from each other as the head <NUM> of the bolt <NUM> is moved downward after the head <NUM> of the bolt <NUM> is moved from the upper body <NUM> to the lower body <NUM>. The feature in which the lower ends of the plurality of pieces of the lower body <NUM> are opened in the direction of being spaced apart from each other is referred to as expansion.

Here, when the plurality of pieces of the lower body <NUM> are opened in the direction of being spaced apart from each other, the spaced distance of the lower ends of the plurality of pieces of the lower body <NUM>, which are spaced apart from each other while facing each other, may be referred to as a size of the internal diameter when the lower body <NUM> is expanded, and the size may be equal to the head size D<NUM> of the bolt <NUM>.

Also, the lower ends of the plurality of pieces of the lower body <NUM> may be elastically supported by the elastic part <NUM> and contracted in a direction of being adjacent to each other when the head <NUM> of the bolt <NUM> is positioned at the upper body <NUM>.

Here, when the plurality of pieces of the lower body <NUM> are contracted in the direction of being adjacent to each other, the spaced distance of the lower ends of the plurality of pieces of the lower body <NUM>, which are spaced apart from each other while facing each other, may be referred to as a size of the internal diameter when the lower body <NUM> is contracted, and the size may be equal to the screw size D<NUM> of the bolt <NUM>.

As described above, as the lower ends of the plurality of pieces of the lower body <NUM> are opened in the direction of being spaced apart from each other or contracted in the direction of being adjacent to each other according to the position of the head <NUM> of the bolt <NUM>, the verticality of the bolt <NUM> may be always maintained.

The elastic part <NUM> may elastically support the lower body <NUM> when the lower body <NUM> of the guide part <NUM> is expanded or contracted. The elastic part <NUM> may include an installation groove <NUM> recessed from an inner wall of the through-hole H2 and an elastic spring <NUM> extending in a direction crossing the movement direction of the bolt <NUM>, disposed in the installation groove <NUM> to protrude to the inside of the through-hole H2, and supporting the lower end of the guide part <NUM>.

A plurality of installation grooves <NUM> may be formed in the block <NUM> and arranged radially around the through-hole H2. A plurality of elastic springs <NUM> may be provided, arranged radially around the through-hole H2, and respectively disposed in the installation grooves <NUM>. Here, each of the elastic springs <NUM> may have one end supported by the inner wall of the installation groove <NUM> and the other end contacting the lower end of the lower body <NUM> of the guide part <NUM>. Thus, the plurality of elastic springs <NUM> may uniformly elastically support the plurality of pieces of the lower body <NUM> of the guide part <NUM>.

<FIG> are schematic views for explaining an operation of the bolting device in accordance with an exemplary embodiment.

Referring to <FIG>, the jig part <NUM> is moved so that the through-hole H2 is vertically aligned onto the bolt hole H1 into which the bolt <NUM> is bolted and disposed on the top surface of the battery pack cover <NUM>. Here, the lower end of the upper body <NUM> of the guide part <NUM> may have an internal diameter equal to an external diameter of the head <NUM> of the bolt <NUM>, i.e., the head size D<NUM>. Here, the lower end of the lower body <NUM> of the guide part <NUM> may have an internal diameter equal to an external diameter of the screw <NUM> of the bolt <NUM>, i.e., the screw size D<NUM>. Here, the lower end of the lower body <NUM> of the guide part <NUM> may be elastically supported by the elastic spring <NUM> of the elastic part <NUM>.

Referring to <FIG>, the bolt <NUM> is disposed in the guide part <NUM>. Here, the end of the head <NUM> of the bolt <NUM> may contact to be supported by the upper portion of the inclined inner surface of the guide part <NUM>, and the lower end of the screw <NUM> of the bolt <NUM> may contact to be supported by the inclined inner surface of the guide part <NUM> so that the bolt <NUM> is vertically supported in the guide part <NUM>.

Referring to <FIG>, the bolt <NUM> may be moved forward P into the bolt hole H1 by applying a predetermined torque T to the head <NUM> of the bolt <NUM>. Here, the head <NUM> of the bolt <NUM> may be entered to the lower body <NUM> of the guide part <NUM> and gradually descended downward. Here, the lower body <NUM> of the guide part <NUM> is elastically expanded to maintain contact with the head <NUM> of the bolt <NUM> and continuously support the verticality of the bolt <NUM>.

Thereafter, the bolt <NUM> may be continuously moved forward P so that the screw <NUM> of the bolt <NUM> is entered until the battery pack housing <NUM>, and the battery pack cover <NUM> and the battery pack housing <NUM> may be coupled by the bolt <NUM>.

The bolting device in accordance with an exemplary embodiment is described in detail with reference to <FIG>. However, the bolting device in accordance with an exemplary embodiment may be variously deformed as in another exemplary embodiment to further still another exemplary embodiment.

<FIG> is a partially enlarged view illustrating a bolting device in accordance with another exemplary embodiment. <FIG> are schematic views illustrating the bolting device in accordance with another exemplary embodiment.

The bolting device in accordance with another exemplary embodiment will be described in detail with reference to <FIG>.

Here, the another exemplary embodiment will be described in terms of a different point between the bolting device in accordance with an exemplary embodiment and the bolting device in accordance with another exemplary embodiment.

Also, a common point of the bolting device in accordance with an exemplary embodiment and the bolting device in accordance with another exemplary embodiment will not be described.

The bolting device in accordance with an exemplary embodiment is different in structure of the elastic part <NUM> from the bolting device in accordance with another exemplary embodiment.

Referring to <FIG>, an elastic part <NUM> in accordance with another exemplary embodiment may include an elastic ring <NUM> surrounding an outer circumferential surface of a lower end of a guide part <NUM>. Here, the elastic ring <NUM> may surround an outer circumferential surface of a lower body <NUM> of the guide part <NUM>. Thus, in accordance with another exemplary embodiment, a through-hole H1 may have a simplified inner structure.

Also, a predetermined projection (not shown) may be formed on the outer circumferential surface of the lower body <NUM> of the guide part <NUM> to prevent deviation of the elastic ring <NUM>, and the elastic ring <NUM> may be supported by the projection.

Referring to <FIG>, when a head <NUM> of a bolt <NUM> is disposed at an upper body <NUM> of the guide part <NUM>, the elastic ring <NUM> may be contracted to tighten the lower body <NUM> of the guide part <NUM>.

Referring to <FIG>, while the head <NUM> of the bolt <NUM> may be entered to the lower body <NUM> of the guide part <NUM> and then descended downward, the elastic ring <NUM> may be expanded to elastically support opening of the lower body <NUM> of the guide part <NUM>. Thus, the bolt <NUM> may maintain the verticality.

<FIG> is a schematic view illustrating a bolting device in accordance with yet another exemplary embodiment.

Referring to <FIG>, the bolting device in accordance with yet another exemplary embodiment is different in elastic modulus of an elastic spring <NUM> from the bolting device in accordance with an exemplary embodiment. For example, the elastic spring <NUM> of the bolting device in accordance with yet another exemplary embodiment may have an elastic modulus greater than that of the elastic spring <NUM> of the bolting device in accordance with an exemplary embodiment. Thus, the elastic spring <NUM> in accordance with yet another exemplary embodiment may further strongly support a lower body <NUM> of a guide part <NUM>. Through this, while a head <NUM> of a bolt <NUM> is entered to the lower body <NUM> of the guide part <NUM> and then descended downward, a portion between an upper end and a lower end of each of a plurality of pieces of the lower body <NUM> may be elastically bent.

<FIG> is a schematic view illustrating a bolting device in accordance with still another exemplary embodiment.

Referring to <FIG>, the bolting device in accordance with still another exemplary embodiment is different in elastic modulus and installation position of an elastic ring <NUM> from the bolting device in accordance with another exemplary embodiment. For example, the elastic ring <NUM> of the bolting device in accordance with still another exemplary embodiment may have an elastic modulus greater than that of the elastic ring <NUM> of the bolting device in accordance with another exemplary embodiment. Also, the elastic ring <NUM> of the bolting device in accordance with still another exemplary embodiment may be installed on an outer circumferential surface of a lower end of a lower body <NUM> of a guide part <NUM>. Thus, the elastic ring <NUM> in accordance with still another exemplary embodiment may further strongly support the lower body <NUM> of the guide part <NUM>. Through this, while a head <NUM> of a bolt <NUM> is entered to the lower body <NUM> of the guide part <NUM> and then descended downward, a portion between an upper end and a lower end of each of a plurality of pieces of the lower body <NUM> may be elastically bent.

<FIG> is a schematic view illustrating a bolting device in accordance with yet still another exemplary embodiment.

Referring to <FIG>, the bolting device in accordance with yet another exemplary embodiment may further include an alignment part <NUM>, <NUM>, and <NUM> in addition to components of the bolting device in accordance with an exemplary embodiment and components of the bolting device in accordance with another exemplary embodiment.

The alignment part is formed in an object to be bolted and a jig part <NUM> to diagnose vertical alignment of a bolt hole H1. Specifically, the alignment part may include a first sensor <NUM> formed at a plurality of positions of a bottom surface of a block <NUM> of the jig part <NUM> and spaced a predetermined distance in the horizontal direction from a central axis of a through-hole H2, an indicator <NUM> connected with the first sensor <NUM> and notifying a sensing result of the first sensor <NUM> by using at least one method of light or sound, and a mark <NUM> formed at a plurality of positions of a top surface of the object to be bolted, e.g., a battery pack cover <NUM>, and spaced a predetermined distance from a central axis of the bolt hole H1.

Here, a spaced distance between a central axis of the through-hole H2 and the first sensor <NUM> may be equal to that between the central axis of the bolt hole H1 and the mark <NUM>. Also, the number of the first sensor <NUM> may be three or more, and the number of the mark <NUM> may be equal to that of the first sensor <NUM>. Also, the plurality of first sensors <NUM> may be spaced by the same angle from each other on a bottom surface of a block <NUM> around the central axis of the through-hole H2. Similarly, the plurality of marks <NUM> may be spaced by the same angle from each other on the top surface of the battery pack cover <NUM> around the central axis of the bolt hole H1. Thus, when the plurality of first sensors <NUM> are aligned to the plurality of marks <NUM>, the central axis of the bolt hole H1 may be vertically aligned to the central axis of the through-hole H2.

When all of the plurality of first sensors <NUM> respectively contact the plurality of marks <NUM>, a sensing signal is outputted to the indicator <NUM>, and the indicator <NUM> outputs the sensing signal by using at least one method of light or sound and notifies the sensing result to the manipulator. Thus, the vertical alignment between the first sensor <NUM> and the mark <NUM> may be easily checked, and the vertical alignment between the central axis of the bolt hole H1 and the central axis of the through-hole H2 may be easily checked.

Here, the method for sensing the mark <NUM> by the first sensor <NUM> may be variously provided. The first sensor <NUM> may be a sensor for sensing a pressure, and the mark <NUM> may protrude by a predetermined height from the top surface of the battery pack cover <NUM>. When the first sensor <NUM> is disposed on the mark <NUM>, the first sensor <NUM> may be pressed upward and retracted into a block <NUM> to sense the mark <NUM>.

The first sensor <NUM> may be a sensor for sensing a current. Each of the plurality of first sensors <NUM> may include a first lead and a second lead on a bottom surface thereof. The mark <NUM> may include an electrically conductive material. When the first sensor <NUM> contacts the mark <NUM>, and all of the first lead and the second lead are disposed on a top surface of the mark <NUM>, a current may flow between the first lead and the second lead through the mark <NUM>, and here, the first sensor <NUM> may sense the current.

The first sensor <NUM> may be a sensor for sensing an optical signal. Each of the plurality of first sensors <NUM> may include a light receiving part and a light emitting part on the bottom surface thereof. The mark <NUM> may be a predetermined material that transmits and scatters light therethrough. When the first sensor <NUM> contacts the mark <NUM>, and all of the light receiving part and the light emitting part are disposed on the top surface of the mark <NUM>, light emitted from the light emitting part may be scattered in the mark <NUM>, a portion thereof may be incident to the light receiving part, and the incident optical signal may be sensed by the first sensor <NUM>.

In addition, the method for sensing the contact with the mark <NUM> by the first sensor <NUM> may be variously provided.

<FIG> is a schematic view illustrating a bolting device in accordance with further still another exemplary embodiment.

Referring to <FIG>, the bolting device in accordance with further still another exemplary embodiment may further include a diagnosis part <NUM> and <NUM> in addition to the components of the bolting device in accordance with an exemplary embodiment.

The diagnosis part may be installed on a jig part <NUM> to diagnose verticality of a bolt <NUM> by using a length variation of each of a plurality of elastic springs <NUM> of an elastic part <NUM>.

The diagnosis part may include a plurality of second sensors <NUM> respectively connected to the plurality of elastic springs <NUM> and an indicator <NUM> for outputting an alarm signal when strain values of the plurality of elastic springs <NUM> outputted from the plurality of second sensors <NUM> are equal to each other.

The second sensor <NUM> may measure a length variation of each of the plurality of elastic springs <NUM> and calculate a strain of each of the plurality of elastic springs <NUM> to output the calculated strain to the indicator <NUM>.

Here, a method of measuring the length variation by the second sensor <NUM> may adopt, e.g., a measurement method of a strain gauge. Alternatively, the method of measuring the length variation by the second sensor <NUM> may be variously provided. For example, the second sensor <NUM> may adopt a measurement method of a distance sensor using a laser beam or an ultrasonic wave.

The plurality of second sensors <NUM> may respectively measure length variations of the plurality of elastic springs <NUM> and calculate strains thereof to output the calculated strain to the indicator <NUM>. The indicator <NUM> may output an alarm when the inputted strain values are equal to each other within a predetermined error range.

That is, when the length variations of the plurality of elastic springs <NUM> are equal to each other, the indicator <NUM> may output the alarm. When the alarm is outputted, the manipulator may check that the length variations of the plurality of elastic springs <NUM> are equal to each other, and through this, may exactly check in real time that the verticality of the bolt <NUM> is maintained.

For example, when the verticality of the bolt <NUM> is not maintained, and the bolt is inclined to one side, the elastic spring <NUM> at the one side to which the bolt <NUM> may be inclined is contracted relatively more or less, and the plurality of elastic springs <NUM> may have a difference in length variation. The difference in length variation may be sensed by the indicator <NUM>, and the alarm may be turned-off. Thus, the manipulator may exactly check that the bolt <NUM> is inclined when the alarm is turned-off.

Here, the above error range may be determined as a predetermined range by reflecting an installation error of each of the plurality of second sensors <NUM> and an own measurement error of the sensor itself.

Claim 1:
A bolting device comprising:
an operation part (<NUM>) designed to be disposed on a table (<NUM>) and comprising a screwdriver bit (<NUM>);
a jig part (<NUM>) designed to be disposed on the table (<NUM>) to contact an object to be bolted in which a bolt hole (H1) is defined and comprising a through-hole (H2) for guiding a bolt (<NUM>) to the bolt-hole (H1);
a guide part (<NUM>) inserted to the through-hole (H2), having a hollow shape to accommodate the bolt (<NUM>) therein, having an inclined inner surface with a shape having an internal diameter that gradually decreases in a downward direction to maintain verticality of the bolt (<NUM>), and having a portion (S) cut in a movement direction of the bolt (<NUM>) so that the inner surface is elastically opened when the bolt (<NUM>) is moved downward; and
an elastic part (<NUM>) in contact with an outer circumferential surface of the guide part (<NUM>) to elastically support a surrounding portion of a cut portion (S) of the guide part (<NUM>),
characterized in that the guide part (<NUM>) comprises:
an upper body (<NUM>) having an internal diameter equal to a head size (D<NUM>) of the bolt (<NUM>) to contact an end of a head (<NUM>) of the bolt (<NUM>); and
a lower body (<NUM>) having an internal diameter equal to a screw size (D<NUM>) of the bolt (<NUM>) to contact a lower end of a screw (<NUM>) of the bolt (<NUM>) when contracted,
wherein the lower body (<NUM>) is divided into a plurality of pieces as a portion thereof is cut in the movement direction of the bolt (<NUM>), and
the plurality of pieces of the lower body (<NUM>) are arranged along a circumference of the upper body (<NUM>) and spaced apart from each other.