TWI805277B - Power tool - Google Patents

Abstract

The present disclosure provides a power tool including a gun body, a trigger, a motor, a shaft set, a ball screw and a pre-fastening module. The pre-fastening module includes a first pre-fastening detecting member and a second pre-fastening detecting member, the first pre-fastening detecting member is linked with the connecting shaft in the axial direction, and the second pre-fastening detecting member is located at a moving path of the ball screw. When the threaded spindle is inserted into a rivet nut and is pressed to cause a movement of the connecting shaft toward the inner region of the gun body, the first pre-fastening detecting member is moved to trigger the second pre-fastening detecting member, and the motor is automatically actuated to rotate the threaded spindle relative to the rivet nut. After the rivet nut is fastened into the threaded spindle, the motor stops automatically. Therefore, the using convenience is improved.

Description

electrical tools

The present invention relates to an electric tool, and in particular to an electric tool for blind rivet nuts.

Blind rivet nuts are used to lock and connect objects through the characteristics of deformation after the structure is pressed. It has the advantages of easy construction and high strength, and is widely used in the fields of automobiles and aviation.

The blind rivet nut has a threaded part and a deformed part. During operation, the blind rivet nut must be pre-locked on the mandrel of the electric tool, and then the deformed part is deformed through the moving stroke of the mandrel, so that the blind rivet nut can be tightened. On the object, conventional electric tools have to press the switch twice to perform the pre-locking of the rivet nut and the deformation locking of the rivet nut respectively, which is inconvenient.

In view of this, how to improve the structure of electric tools to enhance the convenience of operation has become the goal of relevant industry players.

In order to solve the above problems, the present invention provides an electric tool, which can improve the convenience of operation through its structural configuration.

According to one embodiment of the present invention, an electric tool is provided, which is equipped with a blind rivet nut. The electric tool includes a gun body, a switch, a motor, a shaft assembly, a ball screw and a pre-lock starting module. The switch is arranged on the gun body, the motor is arranged on the gun body, the rotating shaft group is arranged on the gun body and is driven by the motor, and the rotating shaft group has an axial direction and includes a threaded spindle and a connecting rod. At least a part of the threaded mandrel is exposed on the gun body to be screwed to the blind rivet nut, and the connecting rod is connected to the threaded mandrel to transmit a rotational driving force of the motor. The ball screw is sleeved on the connecting rod. The pre-lock activation module includes a first pre-lock sensor and a second pre-lock sensor. The first pre-lock sensor moves with the connecting rod in the axial direction, and the second pre-lock sensor The part is located on a moving path of the ball screw. Wherein, when the threaded mandrel is inserted into the blind rivet nut and is pressed so that the connecting rod moves toward the inside of the gun body, the first pre-lock sensor is driven to move to trigger the second pre-lock sensor, and the motor starts automatically and drives the threaded mandrel to pull the threaded mandrel relatively. The rivet nut rotates, and after the blind rivet nut is pre-locked on the threaded mandrel, the motor stops automatically.

In this way, through the induction of the pre-lock start module, the motor can be automatically turned on to complete the pre-lock of the blind rivet nut, and the motor will be automatically stopped after the pre-lock is completed, thereby improving the convenience of use, and at the same time reducing the complexity of the structure and reducing the cost.

According to the aforementioned embodiment, the power tool may further include a position sensing module, which includes a first position sensing element and at least one second position sensing element. The first position sensing element moves axially with the ball screw, the at least one second position sensing element is located on the axial movement path of the ball screw, and the at least one second position sensing element is used to cooperate with the first position sensing element sensing to confirm the position of the ball screw. Wherein, when the switch is operated, the motor starts, so that the threaded mandrel pulls the blind rivet nut to be fixed on an object and withdraws from the blind rivet nut, and the ball screw moves so that the first position sensing part is aligned with the aforementioned at least one second position sensing part position, confirm that the ball screw returns to an initial position, and the motor stops automatically.

In the electric tool according to the aforementioned embodiment, the first position sensing part and the first pre-lock sensing part may have a magnet structure, and the at least one second position sensing part and the second pre-lock sensing part may have a Hall element structure.

According to the aforementioned embodiment, the electric tool may further include a rotor position sensor, which is used to detect the number of rotations of the motor, and when the motor rotates a preset number of times, the motor will automatically stop to complete the pre-setting of the blind rivet nut. Lock.

According to the electric tool of the foregoing embodiment, it may further include a plate body, which is arranged on the gun body and below the connecting rod, the aforementioned at least one second position sensor and the second pre-lock sensor are arranged at intervals on the plate body, and the second The pre-lock sensor is axially farther from the threaded spindle than the at least one second position sensor.

According to the electric tool of the aforementioned embodiment, wherein, the number of the aforementioned at least one second position sensing element can be two, the two second position sensing elements are arranged at intervals on the plate body, and the second pre-lock sensing element is larger than the two second position sensing elements axially away from the threaded mandrel.

In the electric tool according to the aforementioned embodiment, the position sensing module may further include a position detection ring, the position detection ring is screwed to the ball screw and provided for the first position sensing element.

In the electric tool according to the aforementioned embodiment, the pre-lock activation module may further include a pre-lock detection ring, the pre-lock detection ring is sleeved on the connecting rod and provided for the first pre-lock sensor.

According to the aforementioned embodiment, the electric tool may further include a ball nut disposed on the gun body and sleeved on the ball screw, and the ball nut is located between the position detection ring and the threaded spindle.

According to the electric tool of the foregoing embodiment, it may further include a connecting rod driving gear set and a ball nut driving gear set, the connecting rod driving gear set is arranged on the gun body and connected to the connecting rod, and the ball nut driving gear set is arranged on the gun body and connected to the gun body. The ball nut motor includes two output ends, one output end is connected to the connecting rod driving gear set, and the other output end is connected to the ball nut driving gear set.

According to the aforementioned embodiment, the power tool may further include a clutch, the clutch is arranged on the gun body and includes an engaging bush and a stop piece, the engaging bush is set on the connecting rod and rotates with the connecting rod to limit the rotation, and the engaging bush includes a The blocking piece and the blocking piece are set on the joint bush and move together with the driving gear set of the connecting rod. The blocking piece contains a blocking hole corresponding to the blocking piece. When the blocking piece is accommodated in the blocking hole, the motor drives the connecting rod to drive the gear set, and the linkage The blocking plate and the engaging bush drive the connecting rod to rotate.

Embodiments of the present invention will be described below with reference to the drawings. For the sake of clarity, many practical details are included in the following narrative. However, the reader should understand that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some well-known and commonly used structures and elements will be shown in a simple and schematic manner in the drawings; and repeated elements may be represented by the same or similar numbers.

In addition, terms such as first, second, and third in this article are only used to describe different elements or components, and there is no limitation on the elements/components themselves. Therefore, the first element/component can also be renamed as the second element/component . And the combination of components/components/mechanisms/modules in this article is not a combination that is generally known, conventional or conventional in this field, and whether the component/components/mechanism/module itself is known or not can not be used to determine whether the combination relationship is Easily accomplished by persons of ordinary knowledge in the technical field.

Please refer to Figures 1 to 3, wherein Figure 1 shows a perspective view of an electric tool 100 according to an embodiment of the present invention; Figure 2 shows a partial internal perspective view of the electric tool 100 according to the embodiment of Figure 1 ; FIG. 3 shows a schematic cross-sectional view of a part of the power tool 100 of the embodiment in FIG. 1 with a blind rivet nut N1. The electric tool 100 cooperates with a blind rivet nut N1 , and the electric tool 100 includes a gun body 110 , a switch 120 , a motor 140 , a shaft assembly 130 , a ball screw 150 and a pre-lock activation module 170 .

The switch 120 is disposed on the gun body 110 , the motor 140 is disposed on the gun body 110 , and the rotating shaft group 130 is disposed on the gun body 110 and driven by the motor 140 . The rotating shaft group 130 has an axial direction I1 and includes a threaded mandrel 131 and a connecting rod 132. At least a part of the threaded mandrel 131 is exposed to the gun body 110 to screw the blind rivet nut N1. The connecting rod 132 is connected to the threaded mandrel 131. to transmit a rotational driving force of the motor 140 . The ball screw 150 is sleeved on the connecting rod 132 . Please note in particular that in this article, "sleeve" means to fit on the outside of something, and "insert" means to insert on the inside of something.

The pre-lock activation module 170 includes a first pre-lock sensor 171 and a second pre-lock sensor 172. The first pre-lock sensor 171 and the connecting rod 132 move together in the axial direction I1, and the second pre-lock sensor 172 Located on a moving path of the ball screw 150 . Wherein, when the threaded mandrel 131 is inserted into the blind rivet nut N1 and is pressed so that the connecting rod 132 moves toward the inside of the gun body 110, it drives the first pre-lock sensor 171 to move to trigger the second pre-lock sensor 172, and the motor 140 starts automatically. And drive the threaded mandrel 131 to rotate relative to the blind rivet nut N1, and after the blind rivet nut N1 is pre-locked on the threaded mandrel 131, the motor 140 stops automatically.

In this way, the motor 140 can be automatically turned on through the induction of the pre-lock start module 170 to complete the pre-lock of the blind rivet N1, and the motor 140 can be automatically stopped after the pre-lock is completed, thereby improving the convenience of use and reducing the structure. complexity and reduce costs. Details of the electric power tool 100 will be described later.

The gun body 110 of the power tool 100 may include a barrel portion 111 and a handle portion 112 , the handle portion 112 is connected to the barrel portion 111 so that the gun body 110 forms a gun-shaped structure. The switch 120 can be disposed on the handle part 112 , and the motor 140 , the shaft assembly 130 , the ball screw 150 and the pre-lock activation module 170 are all disposed in the cylinder part 111 .

The threaded mandrel 131 includes an opposite first thread lock end 1311 and a second thread lock end. The first thread lock end 1311 passes through the muzzle of the barrel portion 111 and is exposed to the barrel portion 111, and is used for connecting with the blind rivet nut. N1 is matched, and the second screw lock end is located in the barrel portion 111 . The rotating shaft group 130 may further include a pull ring main shaft 133 and a limit buckle 134. The pull ring main shaft 133 is arranged in the barrel portion 111 and connected between the threaded mandrel 131 and the connecting rod 132. The pull ring main shaft 133 includes a screw hole 1331 is located at a front end for the second thread lock end of the threaded mandrel 131 to be locked. The pull ring main shaft 133 also includes an insertion hole located at a rear end for the connecting rod 132 to be inserted. The limit buckle 134 is sleeved on the pull ring main shaft 133. Therefore, the starting point of the travel of the pull-ring main shaft 133 in the axial direction I1 can be limited. The cross-sectional shape of the connecting rod 132 is hexagonal, and the shape of the insertion hole matches the connecting rod 132, so the pull ring main shaft 133 can be driven by the connecting rod 132 to rotate the threaded mandrel 131, but the connecting rod 132 is allowed to be opposite to the axial direction I1. its moving.

The rotating shaft group 130 can further include a spring sleeve 135, a first spring 136 and a second spring 137, the spring sleeve 135 is sleeved on the connecting rod 132, and the spring sleeve 135 is sleeved by the first spring 136, and the second The two springs 137 are sheathed on the connecting rod 132 and resist between the spring sleeve 135 and an end edge of an inner hole of the ball screw 150 .

The electric tool 100 can further include a linkage group 190, the linkage group 190 includes a spindle limiting seat 191 and a locking sleeve 192, one end of the spindle limiting seat 191 is inserted into the pull ring spindle 133, and includes a radial flange 1911 Corresponding to a flange 1332 of the pull ring main shaft 133, the locking sleeve 192 is locked to the other end of the main shaft limit seat 191 and sleeved on the ball screw 150 and the connecting rod 132, and a first end of the ball screw 150 is connected to the lock. With sleeve 192 screw lock. Under this structural configuration, the linkage group 190 and the ball screw 150 can move together in the axial direction I1, but the connecting rod 132 is allowed to move relative to the ball screw 150 in the axial direction I1 inside the ball screw 150, and the connecting rod 132 is allowed to move relative to the ball screw 150 turn.

The electric tool 100 may further include a position sensing module 160 disposed in the cylinder portion 111 and including a first position sensing element 161 and at least one second position sensing element 162 . The first position sensing element 161 moves with the ball screw 150 in the axial direction I1, the at least one second position sensing element 162 is located on the moving path of the ball screw 150 in the axial direction I1, and the at least one second position sensing element 162 is used for To sense the first position sensor 161 to confirm the position of the ball screw 150 . When the switch 120 is operated, the motor 140 starts, so that the threaded mandrel 131 pulls the blind rivet N1 to be fixed on an object and withdraws from the blind N1, and the ball screw 150 moves to make the first position sensing member 161 and the aforementioned at least one first first The two position sensing parts 162 are aligned, and the ball screw 150 is confirmed to return to an initial position, and the motor 140 stops automatically. In this way, after the blind rivet nut N1 is fastened on the object, the motor 140 can be stopped by the sensing of the position sensing module 160 .

The position sensing module 160 can further include a position detection ring 163, the position detection ring 163 can be screwed to the ball screw 150 and provided for the first position sensing element 161 to be set, specifically, the position detection ring 163 can be screwed to the ball screw 150 a second end opposite to the first end. The pre-lock activation module 170 may further include a pre-lock detection ring 173 , the pre-lock detection ring 173 is sheathed on the connecting rod 132 and is provided by the first pre-lock sensor 171 . Specifically, the pre-lock detection ring 173 is sleeved on the spring sleeve 135 and moves together with the spring sleeve 135, and the first spring 136 can be pressed between the pre-lock detection ring 173 and a bearing, wherein the bearing is sleeved on the connecting rod 132 and fixed on the gun body 110 .

As shown in FIG. 3 , the first position sensing element 161 and the first pre-lock sensing element 171 may have a magnet structure, and the aforementioned at least one second position sensing element 162 and the second pre-lock sensing element 172 may have a Hall element structure. Therefore, the electric tool 100 may further include a plate body 180, which is disposed on the gun body 110 and below the connecting rod 132, and the aforementioned at least one second position sensing element 162 and the second pre-lock sensing element 172 are disposed on the plate body 180 at intervals. Moreover, the second pre-lock sensor 172 is farther away from the threaded spindle 131 in the axial direction I1 than the aforementioned at least one second position sensor 162 . Further, the number of the aforementioned at least one second position sensing element 162 can be two, and the two second position sensing elements 162 are arranged on the plate body 180 at intervals, and the second pre-lock sensing element 172 is on the axis of the second pre-lock sensing element 162 . Up I1 away from the threaded spindle 131 . More specifically, the board body 180 has a circuit board structure, and can provide power to the second position sensing element 162 and the second pre-lock sensing element 172 of the Hall element structure, and make it electrically connected with the control circuit. When the first pre-lock sensor 171 moves to be sensed by the second pre-lock sensor 172, the second pre-lock sensor 172 can send a signal to the control circuit to start the motor 140; similarly, when the first position sensor When the movement of the component 161 is sensed by any second position sensing component 162 , the corresponding second position sensing component 162 can send a signal to the control circuit to stop the motor 140 .

The electric tool 100 may further include a ball nut 210 disposed on the gun body 110 and sleeved on the ball screw 150 , and the ball nut 210 is located between the position detection ring 163 and the threaded spindle 131 . The electric tool 100 may further include a connecting rod driving gear set 220 and a ball nut driving gear set 230, the connecting rod driving gear set 220 is arranged on the gun body 110 and connected to the connecting rod 132, and the ball nut driving gear set 230 is arranged on the gun body 110 And the ball nut 210 is connected, the motor 140 includes two output ends 141 , 142 , the output end 141 is connected to the connecting rod driving gear set 220 , and the output end 142 is connected to the ball nut driving gear set 230 .

Specifically, the ball nut driving gear set 230 includes an output gear 231 and a transmission gear 232 , the output gear 231 is connected to the output end 142 , and the transmission gear 232 is meshed between the output gear 231 and the ball nut 210 . The connecting rod driving gear set 220 may include a first gear 221, a second gear 222 and a third gear 223. The first gear 221 is sleeved on the output end 141 to be driven to rotate by the output end 141. The second gear 222 includes a The main gear portion and an auxiliary gear portion, the main gear portion is meshed with the first gear 221 , and the third gear 223 is sheathed on the connecting rod 132 and meshed with the auxiliary tooth portion of the second gear 222 .

The electric tool 100 may further include a clutch 240, the clutch 240 is arranged on the gun body 110 and includes an engaging bush 241 and a stopper 242, the engaging bush 241 is sleeved on the connecting rod 132 and is limited in rotation with the connecting rod 132, engaged The bushing 241 includes a clamping block 2411. The blocking piece 242 is sleeved on the engaging bushing 241 and moves with the connecting rod driving gear set 220. The blocking piece 242 includes a locking hole 2421 corresponding to the blocking block 2411. When the blocking piece 2411 is accommodated in When the hole 2421 is stuck, the motor 140 drives the connecting rod to drive the gear set 220, the interlocking block 242 and the joint bush 241 drive the connecting rod 132 to rotate, and drive the threaded mandrel 131 to rotate to pre-lock the blind rivet nut N1 or withdraw the blind rivet nut N1.

The blocking piece 242 can be fixed on the third gear 223 and move together with the third gear 223. The engaging bush 241 is rotatably coupled to the connecting rod 132, and through the engagement or separation of the engaging bushing 241 and the blocking piece 242, it can be determined whether The connecting rod 132 is to be rotated in conjunction with the third gear 223 .

In addition, the electric tool 100 may further include a rotor position sensor 250, which is used to detect the number of rotations of the motor 140, and when the motor 140 rotates a predetermined number of rotations, the motor 140 automatically stops to complete the blind rivet N1 pre-lock. The rotor position sensor 250 may include a circuit board and a Hall element, or the rotor position sensor 250 may include a back electromotive force circuit to sense the number of rotations of the motor 140. The structure of the rotor position sensor 250 itself is conventional and The improvements that are not the key points of the present invention will not be repeated here. Since the number of rotations of the motor 140 can be converted into the number of rotations of the threaded mandrel 131, it can be known whether it is completely locked into the blind rivet N1, so the motor 140 can be automatically stopped by setting the preset number of rotations. Ease of use can be improved.

Please refer to Fig. 4 and Fig. 5, and refer to Fig. 2 and Fig. 3 together. Fig. 4 shows a schematic cross-sectional view of another part of the power tool 100 in the embodiment of Fig. 1 with blind rivet nut N1, and Fig. 5 It shows another partial cross-sectional schematic view of the electric tool 100 matched with the blind rivet nut N1 of the embodiment in FIG. 1 . As shown in FIG. 3 , in the initial state, the first pre-lock sensing element 171 does not correspond to the second pre-lock sensing element 172 , and there is a gap along the axial direction I1 between the pull ring main shaft 133 and the main shaft limiting seat 191 .

At this time, if the threaded mandrel 131 is inserted into the blind rivet nut N1, and the blind rivet nut N1 is pressed to the threaded mandrel 131, as shown in FIG. Moving along the axial direction I1 away from the muzzle drives the first pre-lock sensor 171 to correspond to the second pre-lock sensor 172, so that the second pre-lock sensor 172 can send a signal to the control circuit to automatically start the motor 140. After the motor 140 is started, the connecting rod drives the gear set 220 to drive the connecting rod 132 to rotate, and the connecting rod 132 and the threaded mandrel 131 can rotate relative to the ball screw 150, and the threaded mandrel 131 can be locked into the rivet nut N1; at the same time , the ball nut driving gear set 230 drives the ball nut 210 to rotate, so that the ball screw 150 moves in the direction away from the muzzle along the axial direction I1, and can drive the main shaft limit seat 191 and the connecting rod 132 to move in the direction away from the muzzle as well. , and the spring sleeve 135 is also moved in the same direction by the effect of the second spring 137 . Finally, after the motor 140 completes the preset number of rotations and completes the pre-locking of the blind rivet nut N1, the motor 140 may stop automatically.

After the pre-lock is completed, as shown in Figure 5, the spring sleeve 135 can be pushed against the engaging bush 241 after moving away from the muzzle, so that the engaging bush 241 is separated from the stopper 242, and the spindle stopper 191 is retracted to The position abutting against the flange 1332 of the main shaft 133 of the pull ring.

In this case, the user can press the switch 120 to manually start the motor 140 . Since the engaging bush 241 is separated from the blocking piece 242 , the motor 140 will not drive the connecting rod 132 to rotate after being started, and the threaded mandrel 131 will not rotate either. The motor 140 drives the ball nut 210 to rotate so that the ball screw 150 moves away from the muzzle, and the main shaft limit seat 191 pulls the ring main shaft 133 backward along the axial direction I1, so that the blind rivet N1 can be pulled to make the blind rivet nut The deformation section of N1 is deformed and locked on the object. The control circuit can know whether the locking of the rivet nut N1 has been completed through the number of rotations of the motor 140, and the motor 140 can be reversed after the locking of the rivet nut N1 is completed, so that the ball screw 150 will rotate along the axial direction I1 Moving towards the muzzle, the pressure of the second spring 137 is relieved and no longer pushes against the spring sleeve 135, the clutch spring of the clutch 240 can push the engagement bush 241 to reset and couple with the stopper 242, and at this time the connecting rod 132 can be driven by the motor 140 Reverse, and can automatically exit the blind rivet N1. Finally, the ball screw 150 drives the first position sensor 161 to correspond to the frontmost second position sensor 162, and the second position sensor 162 sends a signal to the control circuit to confirm that the ball screw 150 returns to the initial position, and the motor 140 can automatically stop, and the threaded mandrel 131 can be completely withdrawn from the blind rivet nut N1.

Please note that if the moving distance of the ball screw 150 is too long during the operation, so that the first position sensing part 161 is aligned with the second position sensing part 162 at the rear, the second position sensing part 162 at the rear will be A signal is sent to the control circuit to indicate that the position of the ball screw 150 is abnormal, and the motor 140 is also stopped at this time, thereby preventing damage or danger of the electric tool 100 and improving the safety of the electric tool 100 .

To sum up, since the electric tool 100 is equipped with the pre-lock activation module 170 and the position sensing module 160, there is no need to install multiple clutches or use high-cost micro switches, thereby reducing the complexity of the structure and cost.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Anyone skilled in this art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be defined by the appended patent application scope.

100: Power Tools 110: gun body 111: Barrel 112: handle part 120: switch 130: Shaft group 131: threaded mandrel 1311: the first screw lock end 132: connecting rod 133: Pull ring spindle 1331: screw hole 1332: Flange 134: limit buckle 135: spring sleeve 136: first spring 137: second spring 140: motor 141,142: output terminal 150: ball screw 160: Position sensing module 161: The first position sensor 162: Second position sensor 163: Position detection ring 170: Pre-lock start module 171: The first pre-lock sensor 172: The second pre-lock sensor 173: Pre-lock detection ring 180: board body 190: linkage group 191: Spindle limit seat 1911: Radial flange 192: locking sleeve 210: ball nut 220: connecting rod drive gear set 221: First gear 222: second gear 223: third gear 230: Ball nut drive gear set 231: output gear 232: transmission gear 240: Clutch 241: joint bushing 2411: block 242: Bracket 2421: card hole 250: Rotor position sensor I1: Axial N1: Blind rivet nut

FIG. 1 shows a perspective view of an electric tool according to an embodiment of the present invention; Figure 2 shows a partial internal perspective view of the electric tool of the embodiment in Figure 1; Figure 3 shows a schematic cross-sectional view of a part of the power tool in the embodiment of Figure 1 with a blind rivet nut; Figure 4 shows another part of the cross-sectional schematic view of the electric tool with the blind rivet nut in the embodiment of Figure 1; and Fig. 5 is a schematic cross-sectional view of another part of the electric tool with the blind rivet nut in the embodiment of Fig. 1 .

120: switch

130: Shaft group

131: threaded mandrel

1311: the first screw lock end

132: connecting rod

133: Pull ring spindle

1331: screw hole

1332: Flange

134: limit buckle

135: spring sleeve

136: first spring

137: second spring

141,142: output terminal

150: ball screw

160: Position sensing module

161: The first position sensor

162: Second position sensor

163: Position detection ring

170: Pre-lock start module

171: The first pre-lock sensor

172: The second pre-lock sensor

173: Pre-lock detection ring

180: board body

190: linkage group

191: Spindle limit seat

1911: Radial flange

192: locking sleeve

210: ball nut

221: First gear

222: second gear

223: third gear

230: Ball nut drive gear set

231: output gear

232: transmission gear

240: Clutch

241: joint bushing

2411: block

242: Bracket

2421: card hole

250: Rotor position sensor

I1: Axial

N1: Blind rivet nut

Claims (9)

An electric tool, matched with a blind rivet nut, the electric tool includes: a gun body; a switch, arranged on the gun body; a motor, arranged on the gun body; a rotating shaft group, arranged on the gun body and driven by the motor Driven, the rotating shaft group has an axial direction and includes: a threaded mandrel, at least a part of which is exposed to the gun body to screw the blind rivet nut; and a connecting rod, connected to the threaded mandrel to transmit A rotational driving force of the motor; a ball screw, which is sleeved on the connecting rod; a position sensing module, including: a first position sensing element, which moves with the ball screw in the axial direction; at least one second The position sensing element is located on a movement path of the ball screw in the axial direction, and the at least one second position sensing element is used for sensing with the first position sensing element to confirm the position of the ball screw; and a position detection ring, the position detection ring is screwed to the ball screw and provided for the first position sensor; and a pre-lock activation module, including: a first pre-lock sensor, which moves with the connecting rod in the axial direction ; and a second pre-lock sensor, located on the moving path of the ball screw; Wherein, when the threaded mandrel is inserted into the blind rivet nut and is pressed to make the connecting rod move toward the inside of the gun body, the first pre-lock sensor is driven to move to trigger the second pre-lock sensor, and the motor starts automatically And drive the threaded mandrel to rotate relative to the blind rivet nut, and after the blind rivet nut is pre-locked on the threaded mandrel, the motor stops automatically; when the switch is operated, the motor starts to make the threaded mandrel Pulling the blind rivet nut to be fixed on an object and exiting the blind rivet nut, the ball screw moves to align the first position sensing element with the at least one second position sensing element, confirming that the ball screw returns to an initial position, The motor stops automatically. The electric tool according to claim 1, wherein the first position sensing part and the first pre-lock sensing part have a magnet structure, and the at least one second position sensing part and the second pre-lock sensing part have Hall elements structure. The electric tool as described in claim 1 further includes a rotor position sensor, which is used to detect the number of rotations of the motor, and when the motor rotates a preset number of times, the motor stops automatically to complete the Pre-locking of blind rivet nuts. The electric tool as described in claim 1, further comprising a plate, which is arranged on the gun body and below the connecting rod, and the at least one second position sensor and the second pre-lock sensor are arranged on the plate at intervals body, and the second pre-lock sensing element is farther away from the threaded spindle in the axial direction than the at least one second position sensing element. The electric tool as described in claim 4, wherein the number of the at least one second position sensing element is two, and the two second position sensing elements are arranged at intervals on the plate body, and the second pre-lock sensing element is larger than the two The second position sensing element is away from the threaded spindle in the axial direction. The electric tool according to claim 1, wherein the pre-lock activation module further includes a pre-lock detection ring, the pre-lock detection ring is sleeved on the connecting rod and provided for the first pre-lock sensor. The electric tool as described in claim 6 further includes a ball nut disposed on the gun body and sleeved on the ball screw, and the ball nut is located between the position detection ring and the threaded spindle. The electric tool as described in claim 7 further comprises a connecting rod driving gear set and a ball nut driving gear set, the connecting rod driving gear set is arranged on the gun body and connected to the connecting rod, the ball nut driving gear set is set The gun body is connected with the ball nut, and the motor includes two output ends, one output end is connected with the connecting rod driving gear set, and the other output end is connected with the ball nut driving gear set. The electric tool as described in claim 8 further includes a clutch, which is arranged on the gun body and includes an engaging bush and a stopper, and the engaging bush is sleeved on the connecting rod and limited in rotation with the connecting rod , the joint bushing includes a block, the blocking piece is sleeved on the joint bushing and connected with the The rod drives the gear set to move together, and the blocking piece includes a clamping hole corresponding to the clamping block. When the clamping block is accommodated in the clamping hole, the motor drives the connecting rod to drive the gear set, and the blocking piece and the engaging bushing are linked together. Drive the connecting rod to rotate.

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