Bit attachment device and tightening module
Provided is a bit attachment device comprising an attaching sleeve, a disassembling-attaching assembly and an abutting assembly arranged in sequence. A first end of the attaching sleeve is attached to a movable rod within the tightening module via a buffer assembly to synchronize movement with the movable rod. A first end of an attaching shaft of the disassembling-attaching assembly forms a tight fit with a second end of the attaching sleeve via a spline structure, and the second end is attached to a bit. The abutting assembly is movably provided at a position on an outer periphery of the second end of the attaching sleeve, so that it can abut against the attaching shaft in a radial direction or move away from the attaching sleeve to loosen the attaching shaft, and with the buffer assembly, mitigate the impact force of the structure to be locked when the bolt is installed.
1 . A bit attachment device, which is applied to a tightening module, the bit attachment device comprising an attaching sleeve, a disassembling-attaching assembly and an abutting assembly arranged in sequence, wherein:
a first end of the attaching sleeve is coupled to a movable rod within the tightening module via a buffer assembly, so as to move with rotational and axial movements of the movable rod;
the disassembling-attaching assembly includes an attaching shaft whose first end forms a tight fit with a second end of the attaching sleeve via a spline structure, and a second end of the attaching shaft configured for attachment to a bit;
the abutting assembly is movably provided at a position located on an outer periphery of the second end of the attaching sleeve, so that said abutting assembly can abut against the attaching shaft in a radial direction, or move toward a direction away from the attaching sleeve to loosen the attaching shaft, wherein:
the first end of the attaching sleeve is sleeved with the buffer assembly for mitigating an impact force generated when the movable rod moves toward the direction of the attaching sleeve, and the second end of the attaching sleeve is formed with an internal spline;
the second end of the attaching sleeve is sleeved on the first end of the attaching shaft, and an external spline matched with the internal spline of the attaching sleeve is formed on the side of the attaching shaft close to the first end thereof;
the buffer assembly includes a spring for abutting against the movable rod and a spring sleeve; and
one end of the spring sleeve is open to install the spring, and the other end thereof abuts against the first end of the attaching shaft.
2 . The bit attachment device according to claim 1 , wherein
the abutting assembly includes an operating member and an abutting member, and the operating member is slidably provided on the outer periphery of the second end of the attaching sleeve; by sliding the operating member, an operating surface of the operating member acts on the abutting member, so that the abutting member becomes close to or away from the attaching shaft.
3 . The bit attachment device according to claim 2 , wherein:
the second end of the attaching sleeve is circumferentially provided with a plurality of through slots;
the operating member includes a slide sleeve slidingly sleeved at the second end of the attaching sleeve; and
the abutting member includes balls capable of being embedded in the through-slots, and an operating surface of the slide sleeve toward the balls is configured as a step surface for the balls to roll on the step surface to move close to or away from the attaching shaft.
4 . The bit attachment device according to claim 3 , wherein the operating surface of the slide sleeve expands outwardly from its abutting place against the balls toward the direction of the attaching sleeve and forms an expansion cavity with the outer surface of the attaching sleeve, so that when the slide sleeve moves toward the direction away from the attaching sleeve, the balls roll into the expansion cavity to release the abutment against the attaching shaft.
5 . The bit attachment device according to claim 3 , wherein the abutting assembly further includes a reset member sleeved on the attaching sleeve, a reset cavity is formed between the slide sleeve and the attaching sleeve for accommodating the reset member, and the reset member is used to exert an acting force to the slide sleeve to reset it toward a direction close to the attaching sleeve.
6 . The bit attachment device according to claim 3 , wherein the first end of the attaching shaft is circumferentially provided with an annular groove, and a portion of one of the balls is located within the annular groove.
7 . The bit attachment device according to claim 1 , wherein the disassembling-attaching assembly further includes a bit sleeve sleeved on the bit, and the second end of the attaching shaft is connected with the bit via the bit sleeve.
8 . A tightening module comprising:
a drive assembly;
a movable rod capable of moving rotationally and axially under the action of the drive assembly; and
a bit attachment device comprising an attaching sleeve, a disassembling-attaching assembly and an abutting assembly arranged in sequence, wherein:
a first end of the attaching sleeve is coupled to a movable rod within the tightening module via a buffer assembly, so as to move with rotational and axial movements of the movable rod;
the disassembling-attaching assembly includes an attaching shaft whose first end forms a tight fit with a second end of the attaching sleeve via a spline structure, and a second end of the attaching shaft configured for attachment to a bit;
the abutting assembly is movably provided at a position located on an outer periphery of the second end of the attaching sleeve, so that said abutting assembly-it can abut against the attaching shaft in a radial direction, or move toward a direction away from the attaching sleeve to loosen the attaching shaft;
the first end of the attaching sleeve is sleeved with the buffer assembly for mitigating an impact force generated when the movable rod moves toward the direction of the attaching sleeve, and the second end of the attaching sleeve is formed with an internal spline;
the second end of the attaching sleeve is sleeved on the first end of the attaching shaft, and an external spline matched with the internal spline of the attaching sleeve is formed on the side of the attaching shaft close to the first end thereof;
the buffer assembly includes a spring for abutting against the movable rod and a spring sleeve; and
one end of the spring sleeve is open to install the spring, and the other end thereof abuts against the first end of the attaching shaft.
9 . The tightening module according to claim 8 , wherein
the abutting assembly includes an operating member and an abutting member, and the operating member is slidably provided on the outer periphery of the second end of the attaching sleeve; by application of an axial force, an operating surface of the operating member acts on the abutting member, so that the abutting member becomes close to or away from the attaching shaft.
10 . The tightening module according to claim 9 , wherein:
the second end of the attaching sleeve is circumferentially provided with a plurality of through slots;
the operating member includes a slide sleeve slidingly sleeved at the second end of the attaching sleeve; and
the abutting member includes balls capable of being embedded in the through-slots, and an operating surface of the slide sleeve toward the balls is configured as a step surface for the balls to roll on the step surface to move close to or away from the attaching shaft.
11 . The tightening module according to claim 10 , wherein the operating surface of the slide sleeve expands outwardly from its abutting place against the balls toward the direction of the attaching sleeve and forms an expansion cavity with the outer surface of the attaching sleeve, so that when the slide sleeve moves toward the direction away from the attaching sleeve, the balls roll into the expansion cavity to release the abutment against the attaching shaft.
12 . The tightening module according to claim 10 , wherein the abutting assembly further includes a reset member sleeved on the attaching sleeve, a reset cavity is formed between the slide sleeve and the attaching sleeve for accommodating the reset member, and the reset member is used to exert an acting force to the slide sleeve to reset it toward a direction close to the attaching sleeve.
13 . The tightening module according to claim 10 , wherein the first end of the attaching shaft is circumferentially provided with an annular groove, and a portion of the one of the balls is located within the annular groove.
14 . The tightening module according to claim 8 , wherein the disassembling-attaching assembly further includes a bit sleeve sleeved on the bit, and the second end of the attaching shaft is connected with the bit via the bit sleeve.