JP2020189343A - Screw fastening failure detection system and screw fastening failure detection method - Google Patents

Abstract

To provide a screw fastening failure detection system and a screw fastening failure detection method by which screw fastening failure can be satisfactorily detected while suppressing increase in screw fastening man-hours.SOLUTION: A screw fastening device 20 comprises an electrically-driven type driver 23 which fastens a screw by rotating the screw. The driver 23 has toque detection function for detecting a screw fastening torque. A controller 30 performs screw fastening process for fastening the screw until the screw arrives at a prescribed fastening position by rotating the screw at a prescribed first rotational speed with the driver 23, and after the screw fastening process, performs post-fastening process for performing fastening by further rotating the screw by only a specified quantity at a second rotational speed lower than the first rotational speed with the driver 23. In addition, the controller 30 detects whether screw fastening failure occurs or not on the basis of the fastening torque which is detected by the driver 23 during performance of the post-fastening process.SELECTED DRAWING: Figure 2

Description

The present invention relates to a screw tightening defect detection system and a screw tightening defect detection method.

In manufacturing a building such as a house, ceiling panels and wall panels are manufactured in advance at a manufacturing factory, and the manufactured ceiling panels and wall panels are brought to a construction site and assembled. For example, when a ceiling panel is manufactured in a manufacturing factory, a wooden field edge is attached to the ceiling beam, and a ceiling surface material made of gypsum board is fixed to the field edge with screws. In this case, when fixing the ceiling surface material to the field edge with screws, a screw tightening device that automatically tightens the screws is often used. For example, Patent Document 1 discloses such a screw tightening device.

When screw tightening is performed by a screw tightening device, it is assumed that poor screw tightening may occur due to a deviation in the mounting position of the field edge with respect to the ceiling beam. Therefore, when tightening screws with a screw tightening device, it is necessary to check each time whether or not a tightening defect has occurred. Patent Document 1 discloses a configuration in which a screw tightening device is provided with a detection function for detecting such tightening defects. The screw tightening device of Patent Document 1 is provided with a torque detection unit that detects the tightening torque at the time of screw tightening, and whether or not a tightening defect has occurred based on the tightening torque detected by the torque detection unit. Is designed to detect.

Japanese Unexamined Patent Publication No. 2012-20353

By the way, since wood-based materials and gypsum boards have a relatively low load during screw tightening, when screw-tightening and fixing a ceiling surface material made of gypsum board to a wooden field edge, a small torque and high-speed rotation are required. It is thought that screw tightening will be performed. For this reason, it is assumed that there is not much difference in torque value between the case where the screw tightening failure occurs and the case where the screw tightening failure does not occur. Therefore, in such a case, it is considered difficult to detect a screw tightening defect by using the technique of Patent Document 1.

Therefore, when fixing the ceiling surface material to the field edge by screwing, it is conceivable to perform screw tightening at a low speed. In this case, since the torque generated during screw tightening becomes large, it is considered that there is a difference in the torque value between the case where the tightening defect occurs and the case where the tightening defect does not occur. Therefore, when the tightening defect occurs, It is considered that the defect can be detected. However, when screw tightening is performed at a low speed, the time required for screw tightening becomes long, which causes a problem of an increase in screw tightening man-hours.

The present invention has been made in view of the above circumstances, and is a screw tightening defect detection system and a screw tightening defect detection system capable of suitably detecting screw tightening defects while suppressing an increase in screw tightening man-hours. The main purpose is to provide a method for detecting a tightening defect.

In order to solve the above problems, the screw tightening defect detection system of the first invention includes an electric driver unit that tightens the screw by rotating a screw that fixes the first member to the second member. Based on the driver control means for controlling the tightening of the screw by the driver unit, the torque detecting means for detecting the tightening torque of the screw by the driver unit, and the tightening torque detected by the torque detecting means. A screw tightening defect detecting system including a tightening defect detecting means for detecting whether or not a screw tightening defect has occurred, wherein the driver control means rotates the screw in a predetermined first rotation by the driver unit. A screw tightening process that tightens the screw until it reaches a predetermined tightening position by rotating at a speed, and a second rotation speed that is lower than the first rotation speed by the driver portion after the screw tightening process. The post-tightening process is performed by further rotating the screw by a predetermined amount to perform tightening, and the tightening defect detecting means is based on the tightening torque detected by the torque detecting means when the post-tightening process is performed. It is characterized in that it detects whether or not a tightening defect of the screw has occurred.

According to the present invention, the screw for fixing the first member to the second member is rotated by the driver portion to tighten the screw. When tightening the screw, the screw is rotated at a predetermined first rotation speed (in other words, a high rotation speed), so that the screw is tightened until it reaches a predetermined tightening position (screw tightening process). After the screw tightening process is performed, a post-tightening process is performed in which the screw is further rotated by a predetermined amount at a second rotation speed lower than the first rotation speed. During this post-tightening process, the tightening torque of the screw is detected, and based on the detected tightening torque, it is detected whether or not a screw tightening defect has occurred. In this case, defective tightening is detected based on the tightening torque when the screw is rotating at a low speed. When the screw is rotating at a low speed, the tightening torque generated when the screw is tightened becomes large. In this case, there is a difference in the tightening torque between the case where the tightening failure occurs and the case where the tightening failure does not occur. Become. Therefore, it is possible to suitably detect a screw tightening defect based on the tightening torque.

Further, in the screw tightening process, the screw is tightened at a high speed rotation (first rotation speed), and in the post-tightening process after the screw tightening process, the screw is tightened at a low speed rotation (second rotation speed). Therefore, most of the screw tightening process can be performed at high speed. Therefore, it is possible to suitably detect a screw tightening defect while suppressing an increase in screw tightening man-hours.

The screw tightening defect detection system of the second invention is characterized in that, in the first invention, the screw is rotated by a predetermined angle of one rotation or less in the post-tightening process.

According to the present invention, after the screw is tightened to a predetermined tightening position by the screw tightening process, only a predetermined angle at which the screw is further rotated one turn or less (that is, 360 ° or less) from the tightening position in the post-tightening process. It is rotated. In this case, it is possible to prevent the screw from being overtightened due to the post-tightening process, which adversely affects the tightening state of the screw.

In the screw tightening defect detection system of the third invention, in the first or second invention, the first member is a face material formed of gypsum board, and the second member is formed of a wood-based material. It is a base material provided on the back surface side of the face material.

By the way, panels such as ceiling panels and wall panels that make up a building are often manufactured in advance at a manufacturing factory. This type of panel includes a face material (for example, a ceiling surface material) and a base material (for example, a field edge) provided on the back surface side thereof. In such panels, the face material may be formed of gypsum board and the base material may be formed of wood-based material. Since gypsum board and wood-based materials have a small load when tightening screws, when screwing and fixing a face material made of gypsum board to a base material made of wood-based material, screws are screwed with a small torque and high speed rotation. It is believed that tightening will take place.

However, in this case, it is assumed that there is not much difference in the tightening torque value between the case where the screw tightening defect occurs and the case where the screw tightening defect does not occur. Therefore, it is considered difficult to detect a screw tightening defect based on the tightening torque at the time of screw tightening. In this respect, in the present invention, the first invention is applied when the face material made of gypsum board is screwed and fixed to the base material made of wood-based material. That is, in the present invention, the screw is tightened at a low speed in the post-tightening process after the screw tightening process, and a tightening defect is detected based on the tightening torque at the low speed rotation. Therefore, even in such a case, a screw tightening defect can be suitably detected.

The screw tightening defect detection method of the fourth invention is a method of detecting a screw tightening defect by rotating an electric screwdriver portion for tightening the screw by rotating a screw fixing the first member to the second member, and the screw driver portion of the screw. A screw tightening defect detecting method for detecting whether or not a screw tightening defect has occurred by using a screw tightening device including a torque detecting means for detecting the tightening torque, wherein the screw is used by the driver unit. A screw tightening step of tightening the screw until it reaches a predetermined tightening position by rotating the screw at a predetermined first rotation speed, and after the screw tightening step, the screwdriver portion tightens the screw from the first rotation speed. Based on the post-tightening step in which the screw is tightened by further rotating it by a predetermined amount at a low second rotation speed and the tightening torque detected by the torque detecting means during the post-tightening step, the screw tightening defect is found. It is characterized by including a tightening defect detection step for detecting whether or not it has occurred.

According to the present invention, the same effect as that of the first invention can be obtained.

(A) is a perspective view showing the structure of the ceiling panel, (b) is a perspective view showing the structure of the ceiling frame constituting the ceiling panel, and (c) is a vertical sectional view showing the structure of the ceiling panel. .. (A) is a plan view showing a screw tightening device, and (b) is a front view showing a screw tightening device. A vertical cross-sectional view showing a state in which a screw tightening defect has occurred. The flowchart which shows the flow of a screw tightening control process. A vertical cross-sectional view showing a flow when a screwdriver tightens a screw.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. In the present embodiment, the ceiling panel constituting the building is manufactured in a manufacturing factory, and the screw tightening process performed in manufacturing the ceiling panel is performed by using a screw tightening device. .. Therefore, in the following, the configuration of the ceiling panel will be described first, and then the screw tightening device will be described.

In the present embodiment, as a building, a unit-type building in which a plurality of rectangular parallelepiped building units are combined with each other is assumed. Although not shown, the building unit is configured to include a ceiling panel and a floor panel having a rectangular shape (rectangular shape), and a plurality of columns connecting the panels. The building unit is manufactured in a manufacturing factory, and in the manufacturing, the ceiling panel and the floor panel are manufactured first, and then the manufactured panels are connected by columns to manufacture the building unit. It is supposed to be done. Then, in the present embodiment, the screw tightening step performed in the manufacture of the ceiling panel of the building unit is performed by the screw tightening device, and the configuration of the ceiling panel will be described below with reference to FIG. .. Note that FIG. 1A is a perspective view showing the configuration of the ceiling panel, FIG. 1B is a perspective view showing the configuration of the ceiling frame constituting the ceiling panel, and FIG. 1C shows the configuration of the ceiling panel. It is a vertical sectional view. Further, in FIGS. 1A and 1C, the ceiling panel is shown in the installation orientation when the screw tightening process is performed. That is, when the ceiling panel is screwed, the ceiling panel is screwed upside down from the actual installation direction. Therefore, in FIGS. 1 (a) and 1 (c), the ceiling panel is shown upside down. Similarly, in FIG. 1B, the ceiling frame is shown upside down.

As shown in FIG. 1A, the ceiling panel 11 includes a ceiling surface material 12 and a ceiling frame 13 that supports the ceiling surface material 12. The ceiling surface material 12 is formed of gypsum board. As shown in FIG. 1B, the ceiling frame 13 includes a plurality of ceiling girders 15 provided on its four sides and a plurality of ceiling joints 16 provided at its four corners. The ceiling girder 15 is made of, for example, channel steel, and the ceiling joint 16 is made of, for example, square steel. Each ceiling girder 15 is connected to a ceiling joint 16 at both ends thereof, whereby the outer frame of the ceiling frame 13 is formed by each ceiling girder 15 and each ceiling joint 16.

On the ceiling panel 11, a plurality of ceiling beams 17 are bridged between the ceiling beams 15 on the long side facing each other at predetermined intervals. These ceiling beams 17 are made of, for example, lip channel steel. As shown in FIG. 1 (c), a field edge 18 is attached to the upper surface (lower surface in the actual installation state) of each ceiling beam 17. The field edge 18 is a long wooden material, and is formed of, for example, a particle board. The field edge 18 is attached to the ceiling beam 17 in a direction extending in the longitudinal direction of the ceiling beam 17. The field edge 18 is attached to the ceiling beam 17 by, for example, a nail.

A ceiling surface material 12 is fixed to the upper surface (lower surface in the actual installation state) of each field edge 18. A plurality of ceiling surface materials 12 are arranged side by side, and each of the ceiling surface materials 12 is fixed to the field edge 18 by screws 19 (screws). In this case, the screws 19 are arranged at a plurality of positions in the longitudinal direction of the field edge 18. In this case, the ceiling surface material 12 corresponds to the first member and the surface material. Further, the field edge 18 corresponds to the second member and the base material.

Here, in the present embodiment, the screw tightening device 20 is used to fix the ceiling surface material 12 to the field edge 18 with screws 19. Therefore, the screw tightening device 20 will be described below with reference to FIG. Note that FIG. 2A is a plan view showing the screw tightening device 20 and FIG. 2B is a front view showing the screw tightening device 20.

As shown in FIGS. 2A and 2B, a table 21 on which the ceiling panel 11 is placed is provided in the manufacturing area of the ceiling panel in the manufacturing factory. The ceiling panel 11 is placed on the table 21 in a state of being turned upside down. Further, when the ceiling panel 11 is placed on the table 21, the ceiling surface material 12 is temporarily fixed to the field edge 18.

A screw tightening device 20 is provided in the manufacturing area of the ceiling panel. The screw tightening device 20 has a gate-shaped base portion 22 provided so as to straddle the table 21, and a plurality of electric drivers 23 provided on the base portion 22. The base portion 22 can slide along the table 21, in other words, along the longitudinal direction of the ceiling panel 11 placed on the table 21. A control device 30 is connected to the base unit 22, and the base unit 22 is slid to a predetermined position based on a command from the control device 30.

The driver 23 tightens the screws 19 to the ceiling panel 11 placed on the table 21. A plurality of drivers 23 are provided in the base portion 22 at predetermined intervals in the left-right direction, and are arranged above the ceiling panel 11 on the table 21. These drivers 23 are arranged so as to correspond to the tightening points for tightening the screws 19 on the ceiling panel 11. That is, a plurality of tightening points are set on the ceiling panel 11 at predetermined intervals in the longitudinal direction of the field edge 18, and each driver 23 is arranged corresponding to each of the tightening points.

Each driver 23 is supported by the base portion 22 so as to be vertically movable via the support portion 25. The support portion 25 extends vertically, and the upper end side thereof is attached to the base portion 22, and the driver 23 is attached to the lower end side thereof. The support portion 25 is slidably attached to the base portion 22 in the vertical direction, and the driver 23 can be moved up and down by the slide. Although the driving unit (motor or the like) for driving the support unit 25 is not shown, the driving unit moves the support unit 25 up and down based on the command of the control device 30.

When the screw 19 is tightened by the driver 23, the screw driver 23 is tightened while being lowered toward the ceiling panel 11. The base portion 22 is provided with a tightening detection sensor 32 that detects that the screw 19 has been tightened to a predetermined tightening position by the driver 23. The tightening detection sensor 32 is connected to the control device 30, and the detection result is sequentially output to the control device 30.

Each driver 23 has a rotating shaft 23a that tightens the screw 19 by rotating the screw 19. Each driver 23 is connected to the control device 30 and tightens the screw 19 based on the command of the control device 30. Further, each driver 23 has a function of adjusting the rotation speed of the screw 19 (in other words, the rotation shaft 23a) and a function of adjusting the rotation angle of the screw 19 (in other words, the rotation shaft 23a). The rotation speed and rotation angle of the screw 19 are controlled by the control device 30.

Each driver 23 has a torque detecting function (corresponding to a torque detecting means) for detecting a tightening torque at the time of screw tightening for tightening the screw 19. The tightening torque detected by each driver 23 is sequentially output to the control device 30. Then, the control device 30 performs a tightening defect detection process for detecting (determining) whether or not a tightening defect of the screw 19 has occurred based on the tightening torque output from the driver 23.

Here, the tightening defect detection process will be described with reference to FIG. FIG. 3 is a vertical cross-sectional view showing a state in which the screw 19 is improperly tightened. In the example of FIG. 3, of the screws 19, the screw 19a is normally tightened, whereas the tip side of the screw 19b is detached from the field edge 18 and a tightening failure occurs. Factors that cause such tightening failure include deviation of the mounting position of the field edge 18 with respect to the ceiling beam 17, bending of the ceiling beam 17, and the like.

If the screw 19 is improperly tightened, so-called idling occurs when the screw 19 is tightened. Therefore, when a tightening defect occurs, it is considered that the tightening torque at the time of tightening the screw 19 is smaller than that when the screw 19 is normally tightened. Therefore, in the screw tightening defect detection process, it is detected (determined) whether or not a screw tightening defect has occurred based on the tightening torque of the screw 19 detected by the driver 23. Specifically, in the tightening defect detection process, when the tightening torque detected by the driver 23 is equal to or higher than a predetermined torque, it is detected that the tightening state is normal. On the other hand, when the detected tightening torque is less than the specified torque, it is detected that the tightening state is abnormal. That is, in this case, it is detected that a tightening defect has occurred.

Returning to the description of FIG. 2, the control device 30 is connected to a notification unit 33 that notifies the fact when a screw tightening defect is detected. The notification unit 33 includes a voice output device such as a speaker, and outputs an alarm sound based on a command from the control device 30.

Next, the screw tightening process performed by the screw tightening device 20 will be described. The screw tightening process is executed by the control device 30.

When the screw 19 is tightened by the screw tightening device 20, the base portion 22 is moved so that each driver 23 is positioned directly above the tightening point of the screw 19 on the ceiling panel 11. Then, each driver 23 is lowered, and the screw 19 is tightened by each of the drivers 23. After the tightening of the screw 19 is completed, each driver 23 is raised, and then the base portion 22 is moved to arrange each driver 23 at the next tightening point. Then, each driver 23 tightens the screw 19 at the tightening point. In this way, in the screw tightening process, the screw 19 is sequentially tightened by the driver 23 at each tightening location of the ceiling panel 11 while moving the base portion 22.

Subsequently, the flow of processing when the screw 19 is tightened by the driver 23 will be described. That is, here, after the driver 23 is arranged directly above the tightening point (predetermined tightening point) of the screw 19 on the ceiling panel 11, the screw 19 is tightened by the driver 23 to the predetermined tightening point. The flow of the process (screw tightening control process) when performing the above will be described. This process is executed by the control device 30 and is started based on the fact that the driver 23 is arranged directly above the predetermined tightening point. Further, in the following, the screw tightening control process will be described with reference to FIGS. 4 and 5. Note that FIG. 4 is a flowchart showing the flow of the screw tightening control process, and FIG. 5 is a vertical cross-sectional view showing the flow when the screw 19 is tightened by the driver 23.

As shown in FIG. 4, first, in step S11, a screw tightening process is performed. In this screw tightening process, the screwdriver 23 rotates the screw 19 at a predetermined first rotation speed to tighten the screw 19 until it reaches a predetermined tightening position. Here, the first rotation speed is set to a relatively high rotation speed. Therefore, the screw tightening process is a process of tightening by rotating the screw 19 at high speed.

In the screw tightening process, the screw 19 is tightened from the position shown in FIG. 5 (a) until it reaches the predetermined tightening position shown in FIG. 5 (b). When the screw 19 is tightened to a predetermined tightening position, the surface (base end surface) of the head 19a of the screw 19 is located at a position lower (deeper) than the surface (upper surface) of the ceiling surface material 12. In the present embodiment, the distance H from the surface of the ceiling surface material 12 to the surface of the screw head 19a is 1 mm in such a tightened state. Note that FIG. 5B shows a state in which the screw 19 is tightened to the ceiling surface material 12 deeper than it actually is in order to make it easy to understand that the distance H is generated. Further, this point is the same in FIG. 5 (c) described later.

Specifically, after the screw tightening process is started in step S11, in the subsequent step S12, whether or not the screw 19 is tightened to a predetermined tightening position based on the detection result from the tightening detection sensor 32 is determined. judge. This determination is repeated until the screw 19 reaches a predetermined tightening position (see FIG. 5B). Then, when the screw 19 is tightened to a predetermined tightening position, the process proceeds to step S13. In this way, the screw tightening process in step S11 is continuously performed until the screw 19 reaches a predetermined tightening position.

In step S13, the post-tightening process is performed. In this post-tightening process, the screwdriver 23 further rotates the screw 19 at a second rotation speed lower than the first rotation speed by a predetermined amount to tighten the screw. Therefore, the post-tightening process is a process of tightening by rotating the screw 19 at a low speed. In the post-tightening process, the screw 19 is further tightened by rotating the screw 19 from a predetermined tightening position by 90 °. By this post-tightening process, the screw 19 is displaced from the position shown in FIG. 5 (b) to the position shown in FIG. 5 (c). In this case, since the screw 19 is only rotated by 90 ° in the post-tightening process, there is almost no change in the tightening position of the screw 19 before and after the post-tightening process. Therefore, before and after the post-tightening process, the distance H from the surface of the ceiling surface material 12 to the surface of the head 19a of the screw 19 is substantially the same.

The tightening torque detected by the driver 23 at the time of performing the post-tightening process is output from the driver 23 to the control device 30. Therefore, in step S14 after the post-tightening process (step S13), a process of acquiring (inputting) the tightening torque output from the driver 23 is performed. Since the tightening torque obtained by this process is the tightening torque when the screw 19 is tightened by the low speed rotation (second rotation speed), the torque value is relatively large.

In the following steps S15 to S17, a tightening defect detection process for detecting (determining) whether or not a tightening defect has occurred in the screw 19 is performed based on the tightening torque of the screw 19 acquired in step S14 (determination). Equivalent to tightening defect detecting means). In this process, first, in step S15, it is determined whether or not the acquired tightening torque has reached the specified torque. Here, the specified torque is an index value for determining whether the tightening state is normal or abnormal. If the tightening torque has reached this specified torque, the process proceeds to step S16, and it is determined that the tightening state of the screw 19 is normal. After that, this process ends. On the other hand, if the tightening torque does not reach the specified torque, the process proceeds to step S17, and it is determined that the tightening state of the screw 19 is defective (abnormal). That is, in this case, it is determined that the screw 19 is not tightened properly.

If it is determined that a tightening defect has occurred, the process proceeds to step S18 to perform alarm processing. In this process, the notification unit 33 outputs an alarm sound to notify the operator that a tightening defect has occurred. After that, this process ends. In the alarm processing, the notification unit 33 may announce which screw 19 has a tightening defect to notify the alarm.

According to the configuration of the present embodiment described in detail above, the following excellent effects can be obtained.

The screw 19 that fixes the ceiling surface material 12 to the field edge 18 is rotated by the driver 23 to tighten the screw 19. When tightening the screw 19, the screw 19 is rotated at a predetermined first rotation speed (in other words, a high rotation speed), so that the screw 19 is tightened until it reaches a predetermined tightening position (screw tightening process). .. After the screw tightening process is performed, a post-tightening process is performed in which the screw 19 is further rotated by a predetermined amount at a second rotation speed lower than the first rotation speed. During this post-tightening process, the tightening torque of the screw 19 is detected, and based on the detected tightening torque, it is detected whether or not a tightening defect of the screw 19 has occurred. In this case, defective tightening is detected based on the tightening torque when the screw 19 is rotating at a low speed. When the screw 19 is rotating at a low speed, the tightening torque generated when the screw is tightened becomes large. In this case, there is a difference in the tightening torque between the case where the tightening failure occurs and the case where the tightening failure does not occur. become. Therefore, it is possible to suitably detect a tightening defect of the screw 19 based on the tightening torque.

Further, in the screw tightening process, the screw is tightened at a high speed rotation (first rotation speed), and in the post-tightening process after the screw tightening process, the screw is tightened at a low speed rotation (second rotation speed). Therefore, most of the screw tightening process can be performed at high speed. Therefore, it is possible to suitably detect a tightening defect of the screw 19 while suppressing an increase in the screw tightening man-hours.

After the screw 19 is tightened to a predetermined tightening position by the screw tightening process, the screw 19 is further rotated by a predetermined angle of one rotation or less (that is, 360 ° or less) from the tightening position in the post-tightening process. I made it. In this case, it is possible to prevent the screw 19 from being adversely affected in the tightening state of the screw 19, such as the screw 19 being tightened more than a predetermined tightening position due to the post-tightening process.

Specifically, in the post-tightening process, the screw 19 is further rotated by 90 ° from the tightening position. In this case, it is possible to further suppress the post-tightening process from adversely affecting the tightened state of the screw 19.

Further, if the rotation angle of the screw 19 in the post-tightening process is smaller than 45 °, the tightening torque during the post-tightening process may not be detected properly. Therefore, in view of this point, it is desirable that the rotation angle of the screw 19 in the post-tightening process is 45 ° or more.

The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

-In the above embodiment, during the post-tightening step, the screw 19 is further rotated by 90 ° from the predetermined tightening position, but the rotation angle in this case does not necessarily have to be 90 °. For example, the rotation angle may be 180 °, 270 °, 360 °, or the like. In these cases as well, since the rotation angle of the screw 19 is one rotation or less, it is possible to prevent inconveniences such as overtightening the screw 19 from the predetermined tightening position due to the post-tightening step. .. Further, the rotation angle may be larger than one rotation (that is, 360 °) as long as such inconvenience can be suppressed.

-In the above embodiment, the screw tightening device 20 is used when screwing the ceiling panel 11, but the screw tightening device 20 is used when screwing other panels such as wall panels and floor panels. You may. For example, in a floor panel, it is conceivable to use a screw tightening device 20 when screwing a floor material made of particle board to a joist made of wooden square wood. Even in that case, it is possible to detect a screw tightening defect by using the screw tightening device 20.

Further, the screw tightening device 20 may be used for screw tightening on building materials other than panels. For example, it can be used for screw tightening when manufacturing fittings such as doors. Further, the screw tightening device 20 may be used for screw tightening on products other than building materials such as electrical products. In these cases as well, it is possible to detect a screw tightening defect by using the screw tightening device 20.

11 ... Ceiling panel, 12 ... Ceiling surface material as first member and face material, 18 ... Field edge as second member and base material, 19 ... Screw, 20 ... Screw tightening device, 23 ... Driver, 30 ... Control device ..

Claims (4)

An electric driver part that tightens the screw by rotating the screw that fixes the first member to the second member, and
A driver control means for controlling the tightening of the screw by the driver unit,
Torque detecting means for detecting the tightening torque of the screw by the driver unit, and
Based on the tightening torque detected by the torque detecting means, the tightening defect detecting means for detecting whether or not the tightening defect of the screw has occurred, and the tightening defect detecting means.
It is a screw tightening defect detection system equipped with
The driver control means
A screw tightening process in which the screw is tightened until it reaches a predetermined tightening position by rotating the screw at a predetermined first rotation speed by the driver portion.
After the screw tightening process, the driver portion performs a post-tightening process in which the screw is further rotated by a predetermined amount at a second rotation speed lower than the first rotation speed to tighten the screw.
The screw tightening defect detecting means detects whether or not a tightening defect has occurred in the screw based on the tightening torque detected by the torque detecting means at the time of performing the post-tightening process. Tightening defect detection system. The screw tightening defect detection system according to claim 1, wherein in the post-tightening process, the screw is rotated by a predetermined angle of one rotation or less. The first member is a face material formed of gypsum board.
The screw tightening defect detection system according to claim 1 or 2, wherein the second member is formed of a wood-based material and is a base material provided on the back surface side of the face material. Screw tightening including an electric driver unit that tightens the screw by rotating a screw that fixes the first member to the second member, and a torque detecting means that detects the tightening torque of the screw by the driver unit. It is a screw tightening defect detection method for detecting whether or not a screw tightening defect has occurred using an apparatus.
A screw tightening step of tightening the screw until it reaches a predetermined tightening position by rotating the screw at a predetermined first rotation speed by the driver portion.
After the screw tightening step, a post-tightening step in which the screw is further rotated by a predetermined amount at a second rotation speed lower than the first rotation speed by the driver portion to be tightened.
It is characterized by comprising a tightening defect detecting step of detecting whether or not a tightening defect of the screw has occurred based on the tightening torque detected by the torque detecting means at the time of performing the post-tightening step. A method for detecting screw tightening defects.

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