Bolted connection device

Abstract

Provided is a bolt connection device including an operation portion provided on a workbench and including a screwdriver head; a clamp portion provided on the workbench to contact an object to be bolted, which is defined with a bolt hole, and including a through hole for guiding a bolt to the bolt hole; a guide portion inserted into the through hole, having a hollow shape to accommodate the bolt therein, having an inclined inner surface having a shape in which an inner diameter gradually decreases in a downward direction to maintain perpendicularity of the bolt, and having a portion cut in a moving direction of the bolt such that the inner surface elastically opens as the bolt moves downward; and an elastic portion in contact with an outer peripheral surface of the guide portion to elastically support a peripheral portion of the cut portion of the guide portion so as to ensure perpendicularity of the bolt with respect to the object to be bolted.

Description

Technical Field

[0001] This disclosure relates to a bolt connection device, and more specifically, to a bolt connection device capable of ensuring the perpendicularity of the bolt relative to the object to be bolted. Background Technology

[0002] Medium and large devices, such as electric vehicles, require high-output and high-capacity power sources. Therefore, medium and large devices typically use medium and large battery packs in which multiple battery cells are electrically connected.

[0003] Multiple battery cells can be connected in series, in parallel, or in a hybrid of series and parallel, while maintaining structural stability against external shocks during connection, enabling medium and large battery packs to meet the high output and large capacity requirements of medium and large equipment.

[0004] Medium and large battery packs are assembled with various components such as outer casing, inner casing, mounting frame, busbar, printed circuit board and heat pump using bolts.

[0005] The bolted couplings of medium and large battery packs need to be executed precisely to maintain a stable structure that can withstand external shocks.

[0006] When bolts are coupled in an inclined position, the joint may be mechanically damaged. Even if the joint is not damaged, gaps may be created in the joint, or unnecessary loads may be applied to it. Therefore, bolted joints may be prone to wear during the use of medium and large battery packs, and may fail rapidly when impacts accumulate during the operation of medium and large equipment.

[0007] The background technology disclosed herein is disclosed in the following patent documents.

[0008] (Patent Document 1) KR10-2020-0075445A

[0009] (Patent Document 2) KR10-2020-0092783A Summary of the Invention

[0010] Technical issues

[0011] This disclosure provides a bolted connection that ensures the perpendicularity of the bolt to the object to be bolted.

[0012] Technical solution

[0013] According to an exemplary embodiment, a bolt connection device includes: an operating part disposed on a workbench and including a screwdriver head; a clamping part disposed on the workbench to contact an object to be bolted, the object to be bolted defining a bolt hole, and the clamping part including a through hole for guiding a bolt to the bolt hole; a guide part inserted into the through hole, having a hollow shape for receiving a bolt therein, having an inclined inner surface having a shape in which the inner diameter gradually decreases in a downward direction to maintain the perpendicularity of the bolt, and the guide part having a portion cut in the direction of bolt movement such that the inner surface elastically opens when the bolt moves downward; and an elastic part contacting the outer peripheral surface of the guide part to elastically support the periphery of the cut portion of the guide part.

[0014] The elastic part may include: a mounting groove recessed from the inner wall of the through hole; and a spring extending in a direction intersecting the movement direction of the bolt and disposed in the mounting groove to protrude into the inside of the through hole, thereby supporting the lower end of the guide part.

[0015] Multiple mounting slots can be formed and arranged radially around the through hole, and multiple springs can be provided. The springs are arranged radially around the through hole and are respectively set in the mounting slots, wherein one end of each spring is supported by the inner wall of the mounting slot, and the other end contacts the lower end of the guide.

[0016] The elastic portion may include an elastic ring that surrounds the outer peripheral surface of the lower end of the guide portion.

[0017] The guide may include: an upper body having an inner diameter equal to the head size of the bolt to contact the end of the bolt head; and a lower body having an inner diameter equal to the shank size of the bolt to contact the lower end of the shank of the bolt during retraction.

[0018] The lower body can be divided into multiple pieces as a portion of it is cut in the direction of bolt movement, and the multiple pieces of the lower body can be arranged along the periphery of the upper body and spaced apart from each other.

[0019] The multiple plates of the lower body can be elastically supported by the elastic part, and as the head of the bolt moves downward, the lower ends of the multiple plates can open in a direction spaced apart from each other.

[0020] The portion between the upper and lower ends of each of the multiple pieces of the lower body can be elastically bent.

[0021] The bolted connection device may also include an alignment part formed in the object to be bolted and the fixture part to diagnose the vertical alignment between the through hole and the bolt hole.

[0022] The bolted connection device may also include a diagnostic section mounted on the clamping section to diagnose the perpendicularity of the bolt by utilizing the length variation of multiple springs in the elastic section.

[0023] Beneficial effects

[0024] According to an exemplary embodiment, when a bolt is engaged into a bolt hole such that a guide portion having an inclined surface with an inner diameter that gradually decreases in the downward direction is provided in the through hole of the clamp portion to maintain the perpendicularity of the bolt, the perpendicularity of the bolt relative to the object to be bolted can be ensured, and the object to be bolted can be guided into the bolt hole by using the guide portion. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating a bolt connection device according to an exemplary embodiment (first embodiment).

[0026] Figure 2 This is an exploded view showing a bolted connection device according to an exemplary embodiment (first embodiment).

[0027] Figure 3 This is a partially enlarged view showing a bolt connection device according to an exemplary embodiment (first embodiment).

[0028] Figures 4 to 6 This is a schematic diagram illustrating a bolt connection device according to an exemplary embodiment (first embodiment).

[0029] Figure 7 This is a partially enlarged view showing a bolt connection device according to another exemplary embodiment (second embodiment).

[0030] Figures 8 to 9 This is a schematic diagram illustrating a bolted connection device according to another exemplary embodiment (second embodiment).

[0031] Figure 10 This is a schematic diagram illustrating a bolted connection device according to yet another exemplary embodiment (the third embodiment).

[0032] Figure 11 This is a schematic diagram illustrating a bolt connection device according to yet another exemplary embodiment (fourth embodiment).

[0033] Figure 12 This is a schematic diagram illustrating a bolt connection device according to yet another exemplary embodiment (fifth embodiment).

[0034] Figure 13 This is a schematic diagram illustrating a bolt connection device according to yet another exemplary embodiment (sixth embodiment). Detailed Implementation

[0035] In the following, exemplary embodiments of the invention will be described in detail with reference to the accompanying drawings. However, the invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make this disclosure thorough and complete, and to fully convey the scope of the invention to those skilled in the art. In the drawings, the dimensions of layers and regions are exaggerated for clarity. The same reference numerals always refer to the same elements.

[0036] In the following description, embodiments of the inventive concept will be described with reference to the accompanying drawings.

[0037] <Exemplary Embodiment (First Embodiment)>

[0038] 1. A bolted connection device according to an exemplary embodiment

[0039] Figure 1 This is a schematic diagram illustrating a bolted connection device according to an exemplary embodiment. Figure 2 This is an exploded view showing a bolted connection device according to an exemplary embodiment. Figure 3 This is a partial enlarged view showing a bolted connection device according to an exemplary embodiment.

[0040] Reference Figures 1 to 3 A detailed description of a bolt connection device according to an exemplary embodiment.

[0041] The bolt connection device according to an exemplary embodiment includes: an operating part 100 disposed on a worktable 10 and including a screwdriver head 110; a clamping part 200 disposed on the worktable 10 to contact an object to be bolted, wherein a bolt hole H1 is formed, and including a through hole H2 for guiding a bolt 30 to the bolt hole H1; a guide part 300 inserted into the through hole H2, having a hollow shape to accommodate the bolt 30 therein, having a shape in which the inner diameter gradually decreases in the downward direction to maintain the perpendicularity of the bolt 30 and having an inclined inner surface, and having a portion cut along the moving direction of the bolt 30 such that the inner surface elastically opens when the bolt 30 moves downward; and an elastic part 400 contacting the outer peripheral surface of the guide part 300 to elastically support the periphery of the cut portion S of the guide part 300.

[0042] Here, the workbench 10 may include a top surface with a predetermined area, such that an object to be bolted may be placed thereon. The object to be bolted may be a battery pack 20. The battery pack 20 may include a battery pack housing 21 and a battery pack cover 22. At least one hole may be formed through the top surface of the battery pack cover 22. At least one hole may be formed through the upper end of the battery pack housing 21 and connect with the hole in the battery pack cover 22. A bolt hole H1 may be formed such that the hole in the battery pack cover 22 connects with the hole in the battery pack housing 21. A thread may be formed on the inner circumferential surface of the bolt hole H1. A bolt 30 may be threaded into and through the bolt hole H1, and the battery pack housing 21 and the battery pack cover 22 may be coupled to form the battery pack 20. At least one cell may be disposed in the battery pack 20.

[0043] In addition to the battery pack 20, the objects to be bolted together can include a variety of objects.

[0044] Bolt 30 includes a head 31 and a threaded shaft 32. A slotted groove (straight-slot groove) or a Phillips head groove (cross-shaped groove) can be formed in the top surface of the head 31. A screwdriver bit 110 can be inserted into either the slotted groove or the Phillips head groove of the head 31. The head 31 can be rotated by rotating the screwdriver bit 110, thus allowing the threaded shaft 32 to rotate. The threaded shaft 32 can include a round shaft and a helical thread. The round shaft can extend downwards from the bottom surface of the head 31. The thread can have a helical structure on the outer circumferential surface of the round shaft. When the head 31 is rotated by the screwdriver bit 110, the threaded shaft 32 can also rotate in the same manner and move forward into the bolt hole H1 via the thread. Alternatively, bolt 30 can have various structures.

[0045] 1.1. Operation unit 100 according to an exemplary embodiment

[0046] The operating part 100 can be a manual screwdriver. The operating part 100 may include a screwdriver head 110 and an operating part body 120. For example, the screwdriver head 110 may include a shank and a screwdriver tip. The screwdriver tip may be formed at the lower end of the shank. The screwdriver tip may be inserted into and engaged with a slotted or Phillips head defined in the head 31. Alternatively, the screwdriver tip may have a Phillips, slotted, rectangular, or hexagonal shape. Additionally, the slot defined in the head 31 of the bolt 30 may have various shapes such as Phillips, slotted, rectangular, or hexagonal. The shank may have an upper end detachable from the operating part body 120.

[0047] The operating unit 100 can be an electric screwdriver. When the operating unit 100 is an electric screwdriver, a rotary motor can be installed in the operating unit body 120 and connected to the upper end of the screwdriver handle. The rotary motor can be connected to a power source via a predetermined circuit. A button can be provided on the outer peripheral surface of the operating unit body 120, and the rotary motor can rotate when current flows through the circuit by pressing the button.

[0048] The operating unit 100 can be moved upward from the worktable 10 at predetermined heights and operated by a robotic arm (not shown) or a robotic hand (not shown).

[0049] 1.2. Clamping unit 200 according to an exemplary embodiment

[0050] The clamping part 200 can be mounted on the top surface of the battery pack cover 22. The clamping part 200 may include a block 210 and a support member 220. The block 210 may be supported by the support member 220. The position of the block 210 can be adjusted in the horizontal direction by moving the support member 220 relative to the battery pack cover 22. The support member 220 can be moved and fixed by a predetermined robotic arm or robotic hand.

[0051] Block 210 may have a predetermined area in the horizontal direction and a predetermined thickness in the vertical direction. A through hole H2 may pass through the center of block 210 in the vertical direction. The inner diameter of the through hole H2 may be larger than the inner diameter of the bolt hole H1.

[0052] Block 210 can accommodate the guide portion 300 passing through the through hole H2, such that the position of the guide portion 300 is aligned with the central axis L of the bolt hole H1 in the vertical direction, and supports the guide portion 300 while the bolt 30 is threaded into the bolt hole H1.

[0053] 1.3. Guide section 300 according to an exemplary embodiment

[0054] The guide portion 300 can support the bolt 30 in the through hole H2 and guide the bolt 30 to the bolt hole H1. The guide portion 300 can have a hollow shape to accommodate the bolt 30 therein. The guide portion 300 can have an inner diameter that gradually decreases from its top to its bottom. Therefore, the guide portion 300 can have an inclined inner surface. Therefore, the bolt 30 can be supported by the inner surface and maintain perpendicularity in the guide portion 300. Specifically, the end of the head of the bolt 30 can contact and be supported by the upper part of the inner surface of the guide portion, and the lower end of the bolt shank can contact and be supported by the lower part of the inner surface of the guide portion 300. Therefore, the bolt 30 can maintain perpendicularity. The guide portion 300 can have a portion cut along the direction of bolt movement, such that the inner surface elastically opens when the bolt 30 moves downward.

[0055] Furthermore, the guide portion 300 can be made of a predetermined elastic material and is protected against damage, such that the inner surfaces contract in directions adjacent to each other or open in directions spaced apart from each other, depending on the position of the head 31 of the bolt 30. Here, the predetermined elastic material can include various materials, including, for example, silicone, resin, and plastic materials.

[0056] The guide portion 300 may include an upper body 310 and a lower body 320, the upper body 310 having a head size D similar to that of the bolt. 31 With the same inner diameter, the lower body 320 has a thread size D that matches the end of the head 31 of the bolt 30. 32 The same inner diameter is used to contact the lower end of the screw 32 of the bolt 30 when it contracts.

[0057] The upper body 310 may have a hollow shape and an inner and outer diameter that gradually decreases from its top to its bottom. The upper body 310 may have an annular horizontal cross-section. The upper body 310 may have an inner diameter equal to the bolt head size D. 31 The lower end and the upper end, whose inner diameter is larger than that of the lower end.

[0058] The lower body 320 can extend downward from the lower end of the upper body 310. The lower body 320 can be divided into multiple pieces as a portion of it is cut along the direction of movement of the bolt 30. The multiple pieces of the lower body 320 can be arranged along the circumference of the upper body 310 and spaced apart from each other.

[0059] When the head 31 of the bolt 30 is located at the upper body 310, the lower end of the lower body 320 may have a thread size D similar to that of the bolt 30. 32 Equal inner diameter. Here, the inner diameter of the lower end of the lower body 320 can be expressed as the spacing distance between the lower ends of the multiple pieces of the lower body 320 that are spaced apart from each other when the head 31 of the bolt 30 is located at the upper body 310.

[0060] The cut portions S of the lower body 320 can be spaced apart from each other along the periphery of the upper body 310 and extend from the upper end to the lower end of the lower body 320. The cut portions S of the lower body 320 allow unrestricted movement of the lower ends of the plurality of pieces of the lower body 320.

[0061] The multiple plates of the lower body 320 can be elastically supported by the elastic part 400. Here, after the head 310 of the bolt 30 moves from the upper body 310 to the lower body 320, as the head 310 of the bolt 30 moves downward, the lower ends of the multiple plates of the lower body 320 can open in a direction spaced apart from each other. The opening of the lower ends of the multiple plates of the lower body 320 in a direction spaced apart from each other is called expansion.

[0062] Here, when the multiple pieces of the lower body 320 open in a direction spaced apart from each other, the distance between the lower ends of the multiple pieces of the lower body 320 that are spaced apart from each other and face each other can be called the inner diameter of the lower body 320 when it expands. This dimension can be equal to the head size D of the bolt 30. 31 .

[0063] Furthermore, when the head 310 of the bolt 30 is located at the upper body 310, the lower ends of the plurality of plates of the lower body 320 can be elastically supported by the elastic part 400 and contract in the direction adjacent to each other.

[0064] Here, when the multiple pieces of the lower body 320 contract in adjacent directions, the distance between the lower ends of the multiple pieces of the lower body 320 that are spaced apart from each other and face each other can be called the inner diameter of the lower body 320 when it contracts. This dimension can be equal to the thread size D of the bolt 30. 32 .

[0065] As described above, the perpendicularity of the bolt 30 can always be maintained as the lower ends of the plurality of plates of the lower body 320 open in directions spaced apart from each other or retract in directions adjacent to each other, depending on the position of the head 31 of the bolt 30.

[0066] 1.4. Elastic portion 400 according to an exemplary embodiment

[0067] When the lower body 320 of the guide portion 300 expands or contracts, the elastic portion 400 can elastically support the lower body 320. The elastic portion 400 may include: a mounting groove 410 recessed from the inner wall of the through hole H2; and a spring 420 extending in a direction intersecting the movement direction of the bolt 30, disposed in the mounting groove 410 to protrude into the inside of the through hole H2, and supporting the lower end of the guide portion 300.

[0068] Multiple mounting slots 410 can be formed in block 210 and arranged radially around through hole H2. Multiple springs 420 can be arranged radially around through hole H2 and respectively disposed in mounting slots 410. Here, one end of each spring 420 can be supported by the inner wall of mounting slot 410, while the other end contacts the lower end of lower body 320 of guide portion 300. Therefore, multiple springs 420 can uniformly and elastically support multiple pieces of lower body 320 of guide portion 300.

[0069] 1.5. Operation method of the bolt connection device according to the exemplary embodiment

[0070] Figures 4 to 6 This is a schematic diagram illustrating the operation of a bolted connection device according to an exemplary embodiment.

[0071] Reference Figure 4The clamping part 200 is moved so that the through hole H2 is vertically aligned with the bolt hole H1 to which the bolt 30 is bolted, and the clamping part 200 is placed on the top surface of the battery pack cover 22. Here, the inner diameter of the lower end of the upper body 310 of the guide part 300 can be equal to the outer diameter of the head 31 of the bolt 30, that is, the head size D. 31 Here, the inner diameter of the lower end of the lower body 320 of the guide part 300 can be equal to the outer diameter of the screw 32 of the bolt 30, that is, the screw size D. 32 Here, the lower end of the lower body 320 of the guide part 300 can be elastically supported by the spring 420 of the elastic part 400.

[0072] Reference Figure 5 Bolt 30 is disposed in guide portion 300. Here, the end of head 31 of bolt 30 can be supported by the upper part of inclined inner surface of guide portion 300, and the lower end of screw 32 of bolt 30 can be supported by inclined inner surface of guide portion 300, so that bolt 30 is vertically supported in guide portion 300.

[0073] Reference Figure 6 By applying a predetermined torque T to the head 31 of the bolt 30, the bolt 30 can move forward P into the bolt hole H1. Here, the head 31 of the bolt 30 can enter the lower body 320 of the guide portion 300 and gradually descend. Here, the lower body 320 of the guide portion 300 elastically expands to maintain contact with the head 31 of the bolt 30 and continuously support the perpendicularity of the bolt 30.

[0074] After this, the bolt 30 can continue to move forward P until the screw 32 of the bolt 30 enters the battery pack housing 21, and the battery pack cover 22 and the battery pack housing 21 can be joined by the bolt 30.

[0075] Reference Figures 1 to 6 The bolted connection device according to the exemplary embodiments is described in detail. However, the bolted connection device according to the exemplary embodiments can be modified in various ways, as in another exemplary embodiment to yet another exemplary embodiment.

[0076] <Another exemplary embodiment (second embodiment)>

[0077] 2. A bolted connection device according to another exemplary embodiment.

[0078] Figure 7 This is a partial enlarged view showing a bolted connection device according to another exemplary embodiment. Figures 8 to 9 This is a schematic diagram illustrating a bolted connection device according to another exemplary embodiment.

[0079] Reference Figures 7 to 9 A bolt connection device according to another exemplary embodiment is described in detail.

[0080] Here, another exemplary embodiment will be described in accordance with the differences between the bolt connection device according to the exemplary embodiment and the bolt connection device according to another exemplary embodiment.

[0081] Furthermore, the commonalities between the bolt connection device according to the exemplary embodiment and the bolt connection device according to another exemplary embodiment will no longer be described.

[0082] The bolt connection device according to an exemplary embodiment has a different structure from the elastic part 400 of the bolt connection device according to another exemplary embodiment.

[0083] 2.1. The elastic portion 400 according to another exemplary embodiment

[0084] Reference Figure 7 and Figure 8 According to another exemplary embodiment, the elastic portion 400 may include an elastic ring 430 surrounding the outer peripheral surface of the lower end of the guide portion 300. Here, the elastic ring 430 may surround the outer peripheral surface of the lower body 320 of the guide portion 300. Therefore, according to another exemplary embodiment, the through hole H1 may have a simplified internal structure.

[0085] In addition, a predetermined protrusion (not shown) may be formed on the outer peripheral surface of the lower body 320 of the guide portion 300 to prevent the elastic ring 430 from shifting, and the elastic ring 430 may be supported by the protrusion.

[0086] 2.2. Operation method of the elastic part 400 according to another exemplary embodiment

[0087] Reference Figure 8 When the head 31 of the bolt 30 is positioned at the upper body 310 of the guide portion 300, the elastic ring 430 can contract to tighten the lower body 320 of the guide portion 300.

[0088] Reference Figure 9 When the head 31 of the bolt 30 can enter the lower body 320 of the guide portion 300 and then descend, the elastic ring 430 can expand to elastically support the opening of the lower body 320 of the guide portion 300. Therefore, the bolt 30 can maintain its verticality.

[0089] <Another exemplary embodiment (third embodiment)>

[0090] 3. A bolted connection device according to yet another exemplary embodiment

[0091] Figure 10 This is a schematic diagram illustrating a bolted connection device according to yet another exemplary embodiment.

[0092] Reference Figure 10The elastic modulus of the bolt connection device according to another exemplary embodiment differs from that of the spring 420 of the bolt connection device according to the exemplary embodiment. For example, the elastic modulus of the spring 420 of the bolt connection device according to another exemplary embodiment may be greater than that of the spring 420 of the bolt connection device according to the exemplary embodiment. Therefore, the spring 420 of the bolt connection device according to another exemplary embodiment can further firmly support the lower body 320 of the guide portion 300. As a result, when the head 31 of the bolt 30 enters the lower body 320 of the guide portion 300 and then descends, the portion between the upper and lower ends of each of the plurality of pieces of the lower body 320 can be elastically bent.

[0093] <Another exemplary embodiment (fourth embodiment)>

[0094] 4. A bolted connection device according to yet another exemplary embodiment

[0095] Figure 11 This is a schematic diagram illustrating a bolted connection device according to yet another exemplary embodiment.

[0096] Reference Figure 11 The elastic modulus and mounting position of the elastic ring 430 in the bolting device according to another exemplary embodiment differ from those in the bolting device according to another exemplary embodiment. For example, the elastic modulus of the elastic ring 430 in the bolting device according to another exemplary embodiment may be greater than that in the bolting device according to another exemplary embodiment. Furthermore, the elastic ring 430 of the bolting device according to another exemplary embodiment may be mounted on the outer peripheral surface of the lower end of the lower body 320 of the guide portion 300. Therefore, the elastic ring 430 according to another exemplary embodiment can further firmly support the lower body 320 of the guide portion 300. As a result, when the head 31 of the bolt 30 enters the lower body 320 of the guide portion 300 and then descends, the portion between the upper and lower ends of each of the plurality of pieces of the lower body 320 can be elastically bent.

[0097] <Another exemplary embodiment (fifth embodiment)>

[0098] 5. A bolted connection device according to yet another exemplary embodiment

[0099] Figure 12 This is a schematic diagram illustrating a bolted connection device according to yet another exemplary embodiment.

[0100] Reference Figure 12 In addition to the components of the bolt connection device according to an exemplary embodiment and the components of the bolt connection device according to another exemplary embodiment, the bolt connection device according to yet another exemplary embodiment may also include alignment portions 510, 520 and 530.

[0101] 5.1. Alignment portion according to yet another exemplary embodiment

[0102] An alignment portion is formed in the object to be bolted and the clamp portion 200 to diagnose the vertical alignment of the bolt hole H1. Specifically, the alignment portion may include: a first sensor 510 formed at multiple locations on the bottom surface of the block 210 of the clamp portion 200 and spaced at a predetermined distance from the central axis of the through hole H2 in the horizontal direction; an indicator 520 connected to the first sensor 510 and notifying the first sensor 510 of the sensing result by at least one method of light or sound; and a mark 530 formed at multiple locations on the top surface of the object to be bolted (e.g., battery pack cover 22) and spaced at a predetermined distance from the central axis of the bolt hole H1.

[0103] Here, the distance between the central axis of the through hole H2 and the first sensor 510 can be equal to the distance between the central axis of the bolt hole H1 and the mark 530. Furthermore, the number of first sensors 510 can be three or more, and the number of marks 530 can be equal to the number of first sensors 510. Additionally, the multiple first sensors 510 can be spaced apart from each other at the same angle around the central axis of the through hole H2 on the bottom surface of the block 310. Similarly, the multiple marks 530 can be spaced apart from each other at the same angle around the central axis of the bolt hole H1 on the top surface of the battery pack cover 22. Therefore, when the multiple first sensors 510 are aligned with the multiple marks 530, the central axis of the bolt hole H1 can be perpendicularly aligned with the central axis of the through hole H2.

[0104] When all the plurality of first sensors 510 respectively contact the plurality of marks 530, a sensing signal is output to an indicator 520, and the indicator 520 outputs the sensing signal by using at least one method of light or sound and notifies the robot of the sensing result. Therefore, the vertical alignment between the first sensors 510 and the marks 530 can 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 can be easily checked.

[0105] Here, a different method may be provided for sensing the mark 530 by the first sensor 510. The first sensor 510 may be a sensor for sensing pressure, and the mark 530 may protrude from the top surface of the battery pack cover 22 at a predetermined height. When the first sensor 510 is positioned on the mark 530, the first sensor 510 may be pressed upward and retracted into the block 210 to sense the mark 530.

[0106] The first sensor 510 may be a sensor for sensing current. Each of the plurality of first sensors 510 may include a first lead and a second lead on its bottom surface. The mark 530 may include a conductive material. When the first sensor 510 contacts the mark 530, and both the first lead and the second lead are disposed on the top surface of the mark 530, current can flow through the mark 530 between the first lead and the second lead, whereby the first sensor 510 can sense the current.

[0107] The first sensor 510 may be a sensor for sensing optical signals. Each of the plurality of first sensors 510 may include a light-receiving part and a light-emitting part on its bottom surface. The mark 530 may be a predetermined material through which light is transmitted and scattered. When the first sensor 510 contacts the mark 530, and the light-receiving part and the light-emitting part are both disposed on the top surface of the mark 530, light emitted from the light-emitting part will be scattered in the mark 530, a portion of which can be incident on the light-receiving part, and the incident optical signal can be sensed by the first sensor 510.

[0108] Alternatively, different methods may be provided for sensing contact with the mark 530 via the first sensor 510.

[0109] <Another exemplary embodiment (sixth embodiment)>

[0110] 6. A bolted connection device according to yet another exemplary embodiment

[0111] Figure 13 This is a schematic diagram illustrating a bolted connection device according to yet another exemplary embodiment.

[0112] Reference Figure 13 In addition to the components of the bolt connection device according to the exemplary embodiment, the bolt connection device according to another exemplary embodiment may also include diagnostic units 520 and 540.

[0113] 6.1. Diagnostic unit according to yet another exemplary embodiment

[0114] The diagnostic unit can be mounted on the clamping unit 200 to diagnose the perpendicularity of the bolt 30 by utilizing the length variation of each of the multiple springs 420 of the elastic unit 400.

[0115] The diagnostic unit may include a plurality of second sensors 540 respectively connected to a plurality of springs 420, and an indicator 520 for outputting an alarm signal when the stress values ​​of the plurality of springs 420 output from the plurality of second sensors 540 are equal to each other.

[0116] The second sensor 540 can measure the length change of each of the multiple springs 420 and calculate the stress of each of the multiple springs 420 to output the calculated stress to the indicator 520.

[0117] Here, the method for measuring length change using the second sensor 540 can employ, for example, a strain gauge measurement method. Alternatively, different methods can be provided for measuring length change using the second sensor 540. For example, the second sensor 540 can employ a distance sensor measurement method using a laser beam or ultrasound.

[0118] Multiple second sensors 540 can each measure the length changes of multiple springs 420 and calculate their stress to output the calculated stress to an indicator 520. The indicator 520 can output an alarm when the input stress values ​​are equal to each other within a predetermined error range.

[0119] In other words, the indicator 520 can output an alarm when the length changes of the multiple springs 420 are equal. When the alarm is output, the robot can check whether the length changes of the multiple springs 420 are equal, thereby accurately checking in real time whether the perpendicularity of the bolt 30 is maintained.

[0120] For example, when the perpendicularity of bolt 30 is not maintained and the bolt tilts to one side, the springs 420 on the side where bolt 30 may tilt will more or less contract relative to each other, and multiple springs 420 will have different length changes. The difference in length change can be sensed by indicator 520, and the alarm can be turned off. Therefore, when the alarm is turned off, the robot can accurately check whether bolt 30 is tilted.

[0121] Here, the aforementioned error range can be determined as a predetermined range by reflecting the installation error of each of the plurality of second sensors 540 and the sensor's own measurement error.

[0122] Although embodiments of the invention have been described, it should be understood that the invention is not limited to these embodiments, but rather that various changes and modifications can be made by those skilled in the art within the spirit and scope of the invention as claimed below. Therefore, those skilled in the art will readily understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as defined by the appended claims.

[0123] (Explanation of reference numerals in the attached diagram)

[0124] 10: Workbench; 20: Battery Pack; 21: Battery Pack Housing

[0125] 22: Battery pack cover; 30: Bolt; 31: Head.

[0126] 32: Screw 100: Operating part 110: Screwdriver head

[0127] 120: Main body of the operating unit; 200: Fixture unit; 210: Block.

[0128] 220: Support component; 300: Guide section; 310: Upper main body

[0129] 320: Lower main body; 400: Elastic part; 410: Mounting groove

[0130] 420: Spring; 430: Elastic ring; 510: First sensor

[0131] 520: Indicator; 530: Marker; 540: Second sensor

[0132] H1: Bolt hole; H2: Through hole; S: Cut-off portion

[0133] D 31 Head size D 32 Screw size L: Central shaft

Claims

1. A bolt connection device comprising: an operation portion provided on a workbench and including a screwdriver head; a clamp portion provided on the workbench 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 portion inserted into the through hole, having a hollow shape for accommodating the bolt therein, having an inclined inner surface having a shape in which an inner diameter gradually decreases in a downward direction to maintain perpendicularity of the bolt, and having a portion cut in a moving direction of the bolt such that the inner surface elastically opens as the bolt moves downward; and wherein the guide portion includes: an upper body having an inner diameter equal to a size of a head of the bolt to contact an end of the head of the bolt; and a lower body having an inner diameter equal to a size of a shank of the bolt to contact a lower end of the shank of the bolt when contracted, the lower body being divided into a plurality of pieces as a portion of the lower body is cut in the moving direction of the bolt, the plurality of pieces of the lower body being arranged along a periphery of the upper body and spaced apart from each other; and an elastic portion in contact with an outer peripheral surface of the guide portion to elastically support a peripheral portion of the cut portion of the guide portion. the elastic portion includes:

2. The bolting device according to claim 1, wherein, a mounting groove recessed from an inner wall of the through hole; and a spring extending in a direction crossing the moving direction of the bolt and provided in the mounting groove to protrude to an inner side of the through hole, thereby supporting a lower end of the guide portion. a plurality of mounting grooves are formed radially around the through hole and arranged, and 3. The bolting device according to claim 2, wherein, a plurality of springs are provided, which are arranged radially around the through hole and respectively provided in the mounting grooves, wherein one end of each of the springs is supported by an inner wall of the mounting groove, and the other end is in contact with the lower end of the guide portion. the elastic portion includes an elastic ring surrounding an outer peripheral surface of the lower end of the guide portion.

4. The bolting device of claim 1, wherein, the plurality of pieces of the lower body are elastically supported by the elastic portion, and lower ends of the plurality of pieces open in a direction spaced apart from each other as the head of the bolt moves downward.

5. The bolting device of claim 1, wherein, a portion between an upper end and a lower end of each of the plurality of pieces of the lower body elastically bends.

6. The bolting device of claim 1, wherein, 7.The bolt connection device of claim 1, further comprising an alignment portion formed in the object to be bolted and the clamp portion to diagnose perpendicular alignment between the through hole and the bolt hole. 8.The bolt connection device of claim 3, further comprising a diagnosis portion mounted on the clamp portion to diagnose perpendicularity of the bolt by using a length variation of the plurality of springs of the elastic portion. ​

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