A bolt tightening device for new energy vehicles

Abstract

The invention relates to the technical field of bolt tightening, and provides a bolt tightening device for new energy vehicles, which is used for screwing the bolt into a threaded hole on a workpiece. The tightening device comprises: a support platform; a tightening unit, which is arranged on the support platform and has a movably arranged grasping member and a tightening member, the grasping member is used for grasping the bolt, and the tightening member is used for driving the bolt to rotate; a driving unit, which is arranged on the support platform and is transmission-connected to the tightening unit, and is used for driving the tightening unit to move; when one end of the bolt is inserted into the threaded hole, the tightening member first drives the bolt to rotate in the opposite direction of the inner thread of the threaded hole, so that no matter how deep the bolt is inserted into the threaded hole, before the bolt is screwed into the threaded hole, the end of the outer thread of the bolt is aligned with the starting end of the inner thread of the threaded hole, so that the change of torque feedback can be monitored by controlling the number of turns the bolt is screwed in, thereby ensuring that all bolts can achieve the same tightening effect.

Description

Technical Field

[0001] The invention relates to the technical field of bolt tightening, and in particular to a bolt tightening device for new energy vehicles. Background Art

[0002] In the prior art, to screw a bolt into a threaded hole, the bolt must first be inserted into the threaded hole and then tightened. In automated work, the number of turns the bolt is screwed into is usually monitored to ensure that the tightening degree of the bolt meets the process requirements. However, in actual operation, since the external thread on the bolt has partially entered the internal thread of the threaded hole when the bolt is inserted into the threaded hole, this results in the starting point being different each time the bolt is screwed in. For example, during the tightening process, if the bolt is initially inserted only a short distance, it will need to be screwed in more turns to achieve the desired tightening degree; on the contrary, if the bolt is initially inserted into a deeper position, the number of turns required will be reduced. This difference leads to changes in torque feedback, making it difficult for existing monitoring methods to ensure that all bolts can achieve the same tightening effect, thereby affecting product quality and the stability of the production line. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a bolt tightening device for new energy vehicles in view of the current status of the prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a bolt tightening device for new energy vehicles is provided, which is used to screw a bolt into a threaded hole on a workpiece, and the tightening device comprises:

[0005] Support table;

[0006] A tightening unit, which is arranged on the support platform, and comprises a movably arranged grabbing member and a tightening member, one end of the tightening member is movably inserted in the grabbing member, the grabbing member is used to grab the bolt, and the tightening member is used to drive the bolt to rotate;

[0007] The tightening member can drive the bolt to rotate in the reverse direction of the internal thread of the threaded hole due to the insertion of one end of the bolt into the threaded hole, so as to align the external thread protrusion at the end of the bolt with the internal thread groove at the starting end of the threaded hole, and after the bolt is aligned with the threaded hole, drive the bolt to rotate in the positive direction of the internal thread of the threaded hole, so as to screw the bolt into the threaded hole;

[0008] A driving unit is arranged on the supporting platform and is in driving connection with the tightening unit, and the driving unit is used to drive the tightening unit to switch between the position of the bolt and the position of the workpiece.

[0009] In the above-mentioned bolt tightening device for new energy vehicles, the tightening unit further includes:

[0010] A support base, on which a first slide rail is disposed;

[0011] A first driving member, which is arranged on the supporting seat, and a driving rod is arranged at an output end of the first driving member;

[0012] A first sliding block, slidably disposed on the first sliding rail;

[0013] A second slider is slidably disposed on the first slide rail and is located on one side of the first slider, and one end of the driving rod passes through the first slider and is connected to the second slider;

[0014] The first driving member drives the first sliding block and the second sliding block to slide on the first sliding rail through the driving rod.

[0015] In the above-mentioned bolt tightening device for new energy vehicles, the tightening unit further includes:

[0016] A second driving member, which is arranged on the first sliding block, the tightening member is arranged at an output end of the second driving member, and the second driving member is used to drive the tightening member to rotate;

[0017] A support block is arranged on the second sliding block, and the grabbing member is arranged on the support block.

[0018] In the above-mentioned bolt tightening device for new energy vehicles, a detection member is also provided on the support seat, and the detection member is used to detect the force applied to the bolt when it is screwed into the threaded hole.

[0019] In the above-mentioned bolt tightening device for new energy vehicles, a cavity is provided in the support block, the cavity is connected to the air source, a through hole is provided in the grasping member, the cavity is connected to the through hole, and the through hole can be in a negative pressure state due to the air source sucking air into the cavity, so as to absorb the bolt.

[0020] In the above-mentioned bolt tightening device for new energy vehicles, a second slide rail is arranged on the support platform, a third slider is arranged on one side of the support seat, and the support seat is slidably arranged on the second slide rail through the third slider.

[0021] In the above-mentioned bolt tightening device for new energy vehicles, the driving unit includes:

[0022] A third driving member, which is arranged on the side of the support platform;

[0023] A rack, which is movably inserted on the support platform and one end of which is connected to the output end of the third driving member;

[0024] The driving wheel is meshed with the rack, and the driving wheel can rotate because the rack is driven by the third driving member.

[0025] In the above-mentioned bolt tightening device for new energy vehicles, the driving unit also includes a connecting rod, one side of which is connected to the driving wheel and the other side is connected to the third slider, and the connecting rod is used to drive the third slider to move.

[0026] Compared with the prior art, the advantage of the present invention is that the external thread protrusion at the end of the bolt is aligned with the internal thread groove at the initial end of the threaded hole by driving the bolt to rotate along the opposite direction of the internal thread of the threaded hole through the tightening member. After alignment, the tightening member continues to drive the bolt to rotate along the positive direction of the internal thread of the threaded hole, and screws the bolt into the threaded hole according to a preset number of turns. In this process, the tightening member drives the bolt to rotate along the opposite direction of the threaded hole, so that no matter how deep the grasping member inserts the bolt into the threaded hole, before the bolt is screwed into the threaded hole, the end of the external thread of the bolt will be aligned with the starting end of the internal thread of the threaded hole. In this way, the tightening device in this scheme can monitor the change of torque feedback by controlling the number of turns the bolt is screwed in, thereby ensuring that all bolts can achieve the same tightening effect, ensuring the quality of the product and the stability of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of this scheme;

[0028] Figure 2 It is a three-dimensional diagram of the tightening unit in this scheme;

[0029] Figure 3 It is a three-dimensional diagram of the partial structure of the drive unit in this solution.

[0030] In the figure, 1. support platform; 2. tightening unit; 3. grabbing member; 4. tightening member; 5. driving unit; 6. support seat; 7. first slide rail; 8. first driving member; 9. driving rod; 10. first slider; 11. second slider; 12. second driving member; 13. support block; 14. second slide rail; 15. third slider; 16. rack; 17. driving wheel; 18. connecting rod. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0032] like Figures 1 to 3As shown, a bolt tightening device for new energy vehicles of the present invention is used to screw a bolt into a threaded hole on a workpiece, and the tightening device includes: a support platform 1; a tightening unit 2, which is arranged on the support platform 1, and the tightening unit 2 has a movably arranged grasping member 3 and a tightening member 4, one end of the tightening member 4 is movably inserted in the grasping member 3, the grasping member 3 is used to grasp the bolt, and the tightening member 4 is used to drive the bolt to rotate; the tightening member 4 can drive the bolt to rotate in the opposite direction of the internal thread of the threaded hole due to one end of the bolt being inserted into the threaded hole, so as to align the external thread protrusion at the end of the bolt with the internal thread groove at the starting end of the threaded hole, and after the bolt is aligned with the threaded hole, the bolt is driven to rotate in the positive direction of the internal thread of the threaded hole, so as to screw the bolt into the threaded hole; a driving unit 5, which is arranged on the support platform 1 and is transmission-connected to the tightening unit 2, and the driving unit 5 is used to drive the tightening unit 2 to switch between the position of the bolt and the position of the workpiece.

[0033] In actual operation, first, the driving unit 5 drives the tightening unit 2 to move to the position of the bolt, and then, the grabbing piece 3 accurately grabs the bolt under the drive of the tightening unit 2. At this time, one end of the tightening piece 4 is against one end of the bolt, and then, the driving unit 5 continues to transport the tightening unit 2 to the position of the workpiece, and the tightening unit 2 drives the grabbing piece 3 to insert the bolt into the threaded hole on the workpiece. At this time, the tightening piece 4 first drives the bolt to rotate in the opposite direction along the internal thread of the threaded hole, so that the external thread protrusion at the end of the bolt is aligned with the internal thread groove at the starting end of the threaded hole. In this way, no matter how deep the bolt is initially inserted into the threaded hole, it can ensure that the external thread of the bolt is completely aligned with the internal thread of the threaded hole. During this period, the tightening piece 4 and the grabbing piece 3 simultaneously exert pressure on the bolt to approach the threaded hole to prevent the bolt from separating from the threaded hole, ensuring that the bolt will not shift during the alignment process. After the end of the bolt is aligned with the starting end of the thread, the tightening piece 4 drives the bolt to rotate along the positive direction of the inner thread of the threaded hole, and screws the bolt into the threaded hole according to the preset number of turns. During this period, the tightening piece 4 and the grasping piece 3 produce pressure on the bolt to approach the threaded hole, so that the bolt will not be separated from the tightening piece 4 due to being screwed into the threaded hole, until the bolt is rotated to the preset number of turns and is completely tightened in the threaded hole; in this process, the tightening piece 4 drives the bolt to rotate in the opposite direction of the threaded hole, so that no matter how deep the grasping piece 3 inserts the bolt into the threaded hole, before the bolt is screwed into the threaded hole, the end of the bolt's external thread will be aligned with the starting end of the inner thread of the threaded hole. In this way, the tightening device in this scheme can monitor the changes in torque feedback by controlling the number of turns the bolt is screwed in, thereby ensuring that all bolts can achieve the same tightening effect, thereby ensuring the quality of the product and the stability of the production line.

[0034] Specifically, the tightening unit 2 also includes: a support base 6, on which a first slide rail 7 is arranged; a first driving member 8, which is arranged on the support base 6, and a driving rod 9 is arranged at the output end of the first driving member 8; a first slider 10, which is slidably arranged on the first slide rail 7; a second slider 11, which is slidably arranged on the first slide rail 7 and is located on one side of the first slider 10, and one end of the driving rod 9 passes through the first slider 10 and is connected to the second slider 11; the first driving member 8 drives the first slider 10 and the second slider 11 to slide on the first slide rail 7 through the driving rod 9, and the first driving member 8 can be a cylinder, a cylinder or a motor.

[0035] Furthermore, the tightening unit 2 also includes: a second driving member 12, which is arranged on the first slider 10, and the tightening member 4 is arranged at the output end of the second driving member 12, and the second driving member 12 is used to drive the tightening member 4 to rotate; a support block 13, which is arranged on the second slider 11, and the grabbing member 3 is arranged on the support block 13, and the second driving member 12 is preferably a rotating motor.

[0036] When the driving unit 5 transports the tightening unit 2 to the position of the workpiece, the first driving member 8 is started, and the first slider 10 and the second slider 11 are driven to move through the driving rod 9, so that the second driving member 12 arranged on the first slider 10 and the supporting block 13 arranged on the second slider 11 are close to the workpiece. At the same time, the tightening member 4 and the workpiece grasped by the grasping member 3 are simultaneously close to the workpiece until one end of the bolt is inserted into the threaded hole on the workpiece. Then, the second driving member 12 is started to drive the tightening member 4 to rotate, and the tightening member 4 drives the bolt to rotate in the opposite direction of the thread in the threaded hole. During this period, the first driving member 8 drives the first slider 10 and the second slider 11 to synchronously approach the direction of the workpiece through the driving rod 9, so that the tightening member 4 and the grasping member 3 apply pressure to the bolt at the same time. This pressure ensures The bolt is ensured not to separate from the threaded hole while rotating in the opposite direction of the inner thread of the threaded hole, thereby avoiding any slippage of the bolt in the initial alignment stage; when the external thread protrusion at the end of the bolt is aligned with the internal thread groove at the starting end of the threaded hole, the second driving member 12 drives the tightening member 4 to rotate in the reverse direction, thereby driving the bolt to rotate in the positive direction of the inner thread of the threaded hole, so that the bolt is screwed into the threaded hole according to a preset number of turns. During this period, the first driving member 8 continues to drive the first slider 10 and the second slider 11 along the slide rail to approach the workpiece through the driving rod 9, so that the grasping member 3 and the tightening member 4 simultaneously generate an extrusion force on the bolt to approach the threaded hole. This continuous pressure helps to ensure that the bolt always maintains correct alignment during the tightening process and can be evenly screwed into the threaded hole until the preset number of tightening turns is reached.

[0037] In order to monitor the force applied to the bolt when it is screwed into the threaded hole, and thus monitor the change in torque feedback, a detection member is also provided on the support seat 6. The detection member is mainly used to monitor the force applied to the bolt in real time during the tightening process, so as to ensure the quality of fit between the bolt and the workpiece. Specifically, if the detection member detects that the force applied to the bolt is within the standard range, it means that the fit between the bolt and the workpiece is qualified; this means that the connection between the bolt and the workpiece has achieved the expected strength and stability. If the force applied to the bolt is monitored to be too large, it means that the fit between the bolt and the workpiece is unqualified, which usually means that the inner diameter of the threaded hole into which the bolt is screwed is too small, resulting in excessive resistance to the bolt during the tightening process. If the force acting on the bolt is detected to be too small, it also means that the fit between the bolt and the workpiece is unqualified. This situation usually means that the inner diameter of the threaded hole into which the bolt is screwed is too large, resulting in insufficient resistance to the bolt during the tightening process. The connection between the bolt and the workpiece is not tight enough and may become loose during use, thus affecting the performance and safety of the product. Through the monitoring of the detection part, the tightening device in this solution can monitor the tightening process of the bolt in real time and promptly detect any unqualified situation, so as to take corresponding measures to make adjustments or alarms, ensuring that each bolt can meet the specified tightening standards, thereby improving the reliability and efficiency of production. The detection part can be a force sensor or a torque sensor.

[0038] In order to allow the grabbing member 3 to grab the bolt, a cavity is provided in the support block 13, and the cavity is connected to the air source. A through hole is provided in the grabbing member 3, and the cavity is connected to the through hole. When the driving unit 5 transports the tightening unit 2 to the position of the bolt, the first driving member 8 drives the driving rod 9, and the driving rod 9 drives the grabbing member 3 to move to a preset grabbing position through the second slider 11. At this time, the air source sucks air into the cavity, so that the cavity and the through hole are both in a negative pressure state, and the grabbing member 3 sucks the bolt. At this time, one end of the tightening member 4 is sucked and tightened against one end of the grabbing member 3. After the bolt is screwed into the threaded hole on the workpiece, the second driving member 12 drives the first slider 10 and the second slider 11 to move away from the workpiece on the first slide rail 7 through the driving rod 9, and the tightening member 4 is separated from the bolt. At the same time, the air source blows air into the cavity, so that the grabbing member 3 is separated from the bolt, and the dust in the through hole and on the surface of the bolt is cleaned.

[0039] Specifically, a second slide rail 14 is provided on the support platform 1, and a third slider 15 is provided on one side of the support seat 6. The support seat 6 is slidably set on the second slide rail 14 through the third slider 15. The driving unit 5 drives the support seat 6 to slide along the second slide rail 14 through the third slider 15, so that the tightening unit 2 switches between the position of the bolt and the position of the workpiece.

[0040] Specifically, the driving unit 5 includes: a third driving member, which is arranged on the side of the support platform 1; a rack 16, which is movably inserted on the support platform 1 and one end of which is connected to the output end of the third driving member; a driving wheel 17, which is engaged with the rack 16, and the driving wheel 17 can rotate due to the third driving member driving the rack 16 to move.

[0041] Furthermore, the driving unit 5 further includes a connecting rod 18 , one side of which is connected to the driving wheel 17 , and the other side of which is connected to the third slider 15 . The connecting rod 18 is used to drive the third slider 15 to move.

[0042] After the third driving member is started, the linear movement of the rack 16 drives the driving wheel 17 to rotate. The meshing between the driving wheel 17 and the rack 16 ensures that each displacement of the rack 16 is converted into a corresponding rotation of the driving wheel 17. The rotation of the driving wheel 17 is transmitted to the third slider 15 through the connecting rod 18, so that the third slider 15 moves linearly along the second slide rail 14. This linear movement allows the support seat 6 to switch between different positions, that is, to move from the position where the bolt is located to the position where the workpiece is located, or vice versa. In this way, the driving unit 5 realizes the precise switching of the tightening unit 2 between the position where the bolt is located and the position where the workpiece is located; this design ensures that the tightening unit 2 can accurately grasp and insert the bolt into the threaded hole on the workpiece, and then perform the tightening operation, and then return to the original position to prepare for the next operation. The whole process realizes automatic control through mechanical linkage, which improves the accuracy and efficiency of the tightening operation. The third driving member can be a cylinder, a pneumatic cylinder or a motor.

[0043] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined by the spirit of the present invention.

Claims

1. A bolt tightening device for new energy vehicles, used to screw a bolt into a threaded hole on a workpiece, characterized in that: The tightening device comprises: Support table; A tightening unit, which is arranged on the support platform, and comprises a movably arranged grabbing member and a tightening member, one end of the tightening member is movably inserted in the grabbing member, the grabbing member is used to grab the bolt, and the tightening member is used to drive the bolt to rotate; The tightening member can drive the bolt to rotate in the reverse direction of the internal thread of the threaded hole due to the insertion of one end of the bolt into the threaded hole, so as to align the external thread protrusion at the end of the bolt with the internal thread groove at the starting end of the threaded hole, and after the bolt is aligned with the threaded hole, drive the bolt to rotate in the positive direction of the internal thread of the threaded hole, so as to screw the bolt into the threaded hole; A driving unit, which is arranged on the support platform and is in driving connection with the tightening unit, and the driving unit is used to drive the tightening unit to switch between the position where the bolt is located and the position where the workpiece is located; The tightening unit further comprises: a support seat, on which a first slide rail is arranged; a first driving member, which is arranged on the support seat, and a driving rod is arranged at an output end of the first driving member; a first slider, which is slidably arranged on the first slide rail; a second slider, which is slidably arranged on the first slide rail and is located on one side of the first slider, and one end of the driving rod passes through the first slider and is connected to the second slider; the first driving member drives the first slider and the second slider to slide on the first slide rail through the driving rod; The tightening unit further includes: a second driving member, which is arranged on the first sliding block, the tightening member is arranged at the output end of the second driving member, and the second driving member is used to drive the tightening member to rotate; a supporting block, which is arranged on the second sliding block, and the grabbing member is arranged on the supporting block; The tightening unit drives the gripping member to insert the bolt into the threaded hole on the workpiece. At this time, the second driving member starts to drive the tightening member to rotate, and the tightening member drives the bolt to rotate in the opposite direction of the inner thread of the threaded hole. During this period, the first driving member drives the first slider and the second slider to approach the workpiece synchronously through the driving rod, so that the tightening member and the gripping member simultaneously apply pressure to the bolt to prevent the bolt from separating from the threaded hole. After the end of the bolt is aligned with the starting end of the thread, the second driving member drives the tightening member to rotate in the reverse direction of the inner thread of the threaded hole, so that the bolt is screwed into the threaded hole according to a preset number of turns. During this period, the first driving member continues to drive the first slider and the second slider to approach the workpiece along the slide rail through the driving rod, so that the gripping member and the tightening member simultaneously generate an extrusion force on the bolt to approach the threaded hole, and the tightening member drives the bolt to rotate along the positive direction of the inner thread of the threaded hole, and screws the bolt into the threaded hole according to a preset number of turns until the bolt rotates to the preset number of turns and is completely tightened in the threaded hole.

2. A bolt tightening device for new energy vehicles as claimed in claim 1, characterized in that: The support seat is also provided with a detection member, which is used to detect the force applied to the bolt when it is screwed into the threaded hole.

3. A bolt tightening device for new energy vehicles as claimed in claim 2, characterized in that: The support block is provided with a cavity connected to an air source, the grabbing piece is provided with a through hole, the cavity is connected to the through hole, and the through hole can be in a negative pressure state due to the air source sucking air into the cavity, so as to absorb the bolt.

4. A bolt tightening device for new energy vehicles as claimed in claim 1, characterized in that: The support platform is provided with a second slide rail, a third slider is provided on one side of the support seat, and the support seat is slidably arranged on the second slide rail through the third slider.

5. A bolt tightening device for new energy vehicles as claimed in claim 4, characterized in that: The driving unit comprises: A third driving member, which is arranged on the side of the support platform; A rack, which is movably inserted on the support platform and one end of which is connected to the output end of the third driving member; The driving wheel is meshed with the rack, and the driving wheel can rotate because the rack is driven by the third driving member.

6. A bolt tightening device for new energy vehicles as claimed in claim 5, characterized in that: The driving unit further comprises a connecting rod, one side of which is connected to the driving wheel, and the other side of which is connected to the third sliding block, and the connecting rod is used to drive the third sliding block to move.

Images