A screw locking torque detection mechanism

Abstract

The present invention discloses a screw locking torque detection mechanism, including: a moving seat, a sleeve, a motor housing carrier, a turntable, a servo motor for measuring torque, a dynamic torque sensor, a transmission shaft for measuring torque and a positioning key control assembly, wherein the turntable is horizontally arranged on the moving seat, the motor housing carrier is arranged on the turntable, the sleeve is located below the motor housing carrier, a positioning key jack radially extending to the hole therein is arranged on the outer circle of the sleeve, and the displacement of the positioning key in the positioning key jack is controlled by the positioning key control assembly, the transmission shaft for measuring torque is arranged at the bottom of the sleeve, and the dynamic torque sensor is connected in series between the transmission shaft for measuring torque and the servo motor for measuring torque. Through the above manner, the screw locking torque detection mechanism described in the present invention drives the motor housing to perform intermittent rotation and the rotation of the motor shaft, and performs torque detection, and has a compact structure and high working efficiency.

Description

Technical Field

[0001] The invention relates to the field of industrial automated manufacturing and assembly, and in particular to a screw locking torque detection mechanism. Background Art

[0002] The connection between the motor housing and the cover needs to be fastened with screws, and in order to improve firmness, some motor housings need up to 7 screws to fix them. Manual screw tightening is inefficient, and electric screwdrivers are mostly used for tightening.

[0003] When an electric screwdriver is used to tighten the screws on the motor housing, the motor housing needs to be rotated intermittently to tighten the screws in multiple holes in turn. Generally, an electric dividing plate is used. However, in the process of tightening the cover plate on the motor housing, in order to avoid the problem of locking the motor shaft, it is also necessary to perform rotation drive and torque detection of the motor shaft to ensure that a certain force value is maintained during the rotation process, which brings difficulties to the design of the entire mechanism. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a screw locking torque detection mechanism to perform positioning and intermittent rotation of a motor housing and realize rotation and torque detection of a motor center shaft.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a screw locking torque detection mechanism, including: a moving seat, a sleeve, a motor housing carrier, a turntable, a servo motor for measuring torque, a dynamic torque sensor, a transmission shaft for measuring torque and a positioning key control assembly, wherein the turntable is horizontally arranged on the moving seat, the motor housing carrier is arranged on the turntable, the sleeve is located below the motor housing carrier, the turntable or the moving seat is provided with a first bearing supporting the sleeve to rotate relative to the turntable, the outer circle of the sleeve is provided with a positioning key socket extending radially to the hole therein, the positioning key socket is provided with a positioning key corresponding to the keyway on the motor shaft, and the displacement of the positioning key in the positioning key socket is controlled by the positioning key control assembly, when the motor housing is vertically arranged on the motor housing carrier, the motor shaft is inserted downward into the middle hole of the sleeve, and locked by inserting the positioning key into the keyway, the transmission shaft for measuring torque is arranged at the bottom of the sleeve and extends to the bottom of the turntable, and the dynamic torque sensor is connected in series between the transmission shaft for measuring torque and the servo motor for measuring torque to perform torque detection.

[0006] In a preferred embodiment of the present invention, a slide rail is disposed below the movable seat, and a slider located on the slide rail is disposed at the bottom of the movable seat.

[0007] In a preferred embodiment of the present invention, an electric screw slide is provided on one side or below the movable seat to drive the movable seat to move along the length direction of the slide rail.

[0008] In a preferred embodiment of the present invention, a second bearing supporting the rotation of the turntable is provided on the moving seat, a first gear is provided on the turntable, a gear motor is provided at the bottom of the moving seat, and a second gear meshing with the first gear is provided on the gear motor.

[0009] In a preferred embodiment of the present invention, a plurality of positioning holes located on the same loop are arranged at intervals on the turntable, a positioning cylinder pointing to the positioning holes is arranged on the moving seat, and a positioning column pointing to the positioning holes is arranged on the positioning cylinder.

[0010] In a preferred embodiment of the present invention, a motor bracket is arranged under the moving seat, the servo motor for measuring torque is arranged in the motor bracket and points to the transmission shaft for measuring torque, and a first origin sensor corresponding to the transmission shaft for measuring torque is arranged in the motor bracket.

[0011] In a preferred embodiment of the present invention, the positioning key control assembly includes a telescopic cylinder, a moving block, a moving block mounting seat and a baffle, the telescopic cylinder is arranged on the moving seat and points to the sleeve, the moving block mounting seat is arranged on the turntable, the moving block is arranged in the moving block mounting seat and points to the sleeve, a roller is arranged on the tail end of the moving block, the telescopic cylinder is arranged on a driving seat extending upward, the driving seat is arranged on a hook plate extending from the top of the roller to the inner side of the rotation track of the roller, a vertical pull plate is arranged on the front end of the moving block, the baffle is arranged on the outer circle of the sleeve and bent to extend to the front of the outer end of the positioning key, the outer end of the positioning key is arranged with a first spring in contact with the inner side of the baffle, and the outer end of the positioning key is arranged with a lever extending downward to the outside of the rotation track of the vertical pull plate.

[0012] In a preferred embodiment of the present invention, protrusions are provided on both sides of the moving block to form a cross structure, the moving block mounting seat is provided with a guide rail located below the moving block, the moving block mounting seat is provided with a second spring located behind the protrusion to drive the moving block and the protrusion to move forward, and the moving block mounting seat is provided with a stop block located in front of the protrusion to limit the forward movement.

[0013] In a preferred embodiment of the present invention, the number of the positioning key socket is at least one.

[0014] In a preferred embodiment of the present invention, a second origin sensor corresponding to the turntable is provided on the moving base.

[0015] The beneficial effects of the present invention are: a screw locking torque detection mechanism pointed out by the present invention drives the motor housing carrier and the motor housing above it to rotate intermittently through a turntable, which facilitates the electric screwdriver to descend for screw locking, and in the process of screw locking, the rotation of the motor shaft is driven by the sleeve, and the torque is detected by a dynamic torque sensor. The positioning key control component is used to realize flexible locking and unlocking of the sleeve and the motor shaft, with a compact structure and high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0017] Figure 1 It is a structural schematic diagram of a preferred embodiment of a screw locking torque detection mechanism of the present invention;

[0018] Figure 2 yes Figure 1 Left view of;

[0019] Figure 3 yes Figure 1 Stereoscopic image of

[0020] Figure 4 yes Figure 1 Schematic diagram of the structure of the positioning key control component. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1~Figure 4 , the embodiment of the present invention includes:

[0023] like Figure 1The screw locking torque detection mechanism shown includes: a moving seat 1, a sleeve 25, a motor housing carrier 3, a turntable 4, a servo motor 9 for measuring torque, a dynamic torque sensor 10, a transmission shaft 12 for measuring torque and a positioning key control component. A slide rail 6 is arranged below the moving seat 1, and a slider 5 located on the slide rail 6 is arranged at the bottom of the moving seat 1 to improve the movement stability of the moving seat 1. In this embodiment, an electric screw slide 20 is arranged below the moving seat 1 to drive it to move along the length direction of the slide rail 6. The electric screw slide 20 can be controlled by a PLC to improve the displacement accuracy of the moving seat 1.

[0024] like Figure 2 As shown, the turntable 4 is horizontally arranged on the moving seat 1, and the moving seat 1 is provided with a second bearing 34 for supporting the rotation of the turntable 4, and the rotation stability is good. A first gear 17 is arranged on the turntable 4, and a gear motor 19 is arranged at the bottom of the moving seat 1. The gear motor 19 is provided with a second gear 18 meshing with the first gear 17 to drive the rotation of the turntable 4. A second origin sensor 2 corresponding to the turntable 4 is arranged on the moving seat 1 to detect the origin of the turntable 4. The second origin sensor 2 is connected to the PLC for signal transmission, which facilitates the PLC to control the rotation of the gear motor 19, so that the turntable 4 rotates a certain angle each time. A plurality of positioning holes 22 located on the same loop are arranged at intervals on the turntable 4, and a positioning cylinder 7 pointing to the positioning hole is arranged on the moving seat 1. A positioning column pointing to the positioning hole 22 is arranged on the positioning cylinder 7. The angle of the turntable 4 is locked by the positioning column, and the position accuracy and process stability of the locking screw are improved.

[0025] The motor housing carrier 3 is mounted on the turntable 4 and rotates with the turntable 4. The shaft sleeve 25 is located below the motor housing carrier 3. In this embodiment, a first bearing 32 is provided on the turntable 4 or the moving seat 1 to support the shaft sleeve 25 to rotate relative to the turntable 4, so that the shaft sleeve 25 does not rotate with the turntable 4.

[0026] The outer circumference of the sleeve 25 is provided with a positioning key insertion hole extending radially to the hole 23 therein, and a positioning key 24 corresponding to the key slot on the motor shaft is provided in the positioning key insertion hole. The number of the positioning key insertion hole is at least one. Figure 4 The outer circle of the shaft sleeve 25 shown is provided with a plurality of positioning key holes, which can cope with the keyways of the central shafts of various types of motors, thereby improving the versatility of the equipment.

[0027] In this embodiment, the displacement of the positioning key 24 in the positioning key socket is controlled by the positioning key control assembly. When the motor housing 21 is vertically arranged on the motor housing carrier 3, the motor shaft is downwardly inserted into the center hole 23 of the sleeve 25, and the positioning key 24 is inserted into the key slot for locking, so that the motor shaft rotates with the sleeve 25.

[0028] like Figure 1 and Figure 2As shown, the torque measuring transmission shaft 12 is arranged at the bottom of the sleeve 25 and extends to the bottom of the turntable 4. In this embodiment, a motor bracket 11 is arranged below the moving seat 1. The servo motor 9 for measuring torque is arranged in the motor bracket 11 and points to the torque measuring transmission shaft 12. The dynamic torque sensor 10 is connected in series between the torque measuring transmission shaft 12 and the servo motor 9 for measuring torque. The torque measuring transmission shaft 12, the sleeve 25 and the motor shaft are driven to rotate by the servo motor 9 for measuring torque. At the same time, the dynamic torque sensor 10 is used to detect torque to detect whether the motor shaft is locked. If the motor shaft is locked, the torsion required for rotation increases and is detected, and the work of locking the screw is stopped. In addition, a first origin sensor 8 corresponding to the torque measuring transmission shaft 12 is arranged in the motor bracket 11 to detect the origin of the torque measuring transmission shaft 12, which is beneficial to the PLC to control the rotation of the servo motor 9 for measuring torque.

[0029] In this embodiment, the positioning key control assembly includes a telescopic cylinder 13, a moving block 29, a moving block mounting seat 31 and a baffle 27. The telescopic cylinder 13 is horizontally arranged on the moving seat 1 and points to the sleeve 25. The moving block mounting seat 31 is arranged on the turntable 4. The moving block 29 is arranged in the moving block mounting seat 31 and points to the sleeve 25. The moving block 29 rotates with the turntable 4 and is not affected by the telescopic cylinder 13.

[0030] The rear end of the moving block 29 is provided with a roller 15, the telescopic cylinder 13 is provided with a driving seat 14 extending upward, and the driving seat 14 is provided with a hook plate 16 extending from the top of the roller to the inner side of the rotation track of the roller 15. The hook plate 16 is contracted by the telescopic cylinder 13 to push the roller 15 and the moving block 29 outward and backward. In this embodiment, protrusions are provided on both sides of the moving block 29 to form a cross structure, and a guide rail located below the moving block 29 is provided on the moving block mounting seat 31 to improve the stability of movement. A second spring 30 located behind the protrusion is provided in the moving block mounting seat 31. After the telescopic cylinder 13 is extended, the roller 15, the moving block 29 and the protrusion are reset forward under the action of the second spring 30, and a stopper located in front of the protrusion is provided on the moving block mounting seat 31 to limit the forward movement.

[0031] like Figure 4As shown, in this embodiment, the baffle 27 adopts an L-shaped bent plate structure. The baffle 27 is fixed on the outer circle of the shaft sleeve 25 by screws and bent to extend to the front of the outer end of the positioning key 24. The outer end of the positioning key 24 is provided with a first spring 26 that contacts the inner side of the baffle 27 to perform elastic internal pressure on the positioning key 24. A vertical pull plate 33 is provided on the front end of the moving block 29, and a lever 28 extending downward to the outer side of the rotation track of the vertical pull plate 33 is provided on the outer end of the positioning key 24. When the moving block 29 and the vertical pull plate 33 retreat, the lever 28 and the positioning key 24 are driven to move outward by the vertical pull plate 33, so that the positioning key 24 exits the key slot, which is conducive to locking and unlocking the motor center shaft through the telescopic cylinder 13, and the operation is simple.

[0032] In summary, the screw locking torque detection mechanism pointed out in the present invention realizes the locking and unlocking of the motor shaft, so that the motor housing and the motor shaft rotate separately, which is beneficial to the locking screws of the motor housing and the torque detection of the motor shaft. It has multiple functions in one machine, which ensures the assembly stability during the motor production process, improves production efficiency while also ensuring production quality. It has good versatility and can adapt to the assembly of various motor housing products.

[0033] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A screw locking torque detection mechanism, used for detecting the torque of the motor shaft when the motor housing and the end cover are screwed together, characterized in that: include: A moving seat, a sleeve, a motor housing carrier, a turntable, a servo motor for measuring torque, a dynamic torque sensor, a transmission shaft for measuring torque and a positioning key control assembly. The turntable is horizontally arranged on the moving seat, the motor housing carrier is arranged on the turntable, the sleeve is located below the motor housing carrier, the turntable or the moving seat is provided with a first bearing supporting the sleeve to rotate relative to the turntable, a positioning key socket extending radially to a hole therein is arranged on the outer circle of the sleeve, a positioning key socket corresponding to a keyway on the motor center shaft is arranged in the positioning key socket, and the displacement of the positioning key in the positioning key socket is controlled by the positioning key control assembly. When the motor housing is vertically arranged on the motor housing carrier, the motor center shaft is downwardly inserted into the center hole of the sleeve and locked by inserting the positioning key into the keyway. The transmission shaft for measuring torque is arranged at the bottom of the sleeve and extends to below the turntable. The dynamic torque sensor The cam is connected in series between a transmission shaft for measuring torque and a servo motor for measuring torque to perform torque detection. The positioning key control assembly includes a telescopic cylinder, a moving block, a moving block mounting seat and a baffle. The telescopic cylinder is arranged on the moving seat and points to the shaft sleeve. The moving block mounting seat is arranged on the turntable. The moving block is arranged in the moving block mounting seat and points to the shaft sleeve. A roller is arranged on the tail end of the moving block. The telescopic cylinder is provided with a driving seat extending upward. The driving seat is provided with a hook plate extending from the top of the roller to the inner side of the roller rotation track. A vertical pull plate is arranged on the front end of the moving block. The baffle is arranged on the outer circle of the shaft sleeve and is bent and extended to the front of the outer end of the positioning key. The outer end of the positioning key is provided with a first spring in contact with the inner side of the baffle. The outer end of the positioning key is provided with a lever extending downward to the outer side of the rotation track of the vertical pull plate. The number of the positioning key sockets is at least one.

2. The screw locking torque detection mechanism according to claim 1, characterized in that: A slide rail is arranged below the moving seat, and a slider located on the slide rail is arranged at the bottom of the moving seat.

3. The screw locking torque detection mechanism according to claim 2, characterized in that: An electric screw slide table is arranged on one side or below the movable seat to drive the movable seat to move along the length direction of the slide rail.

4. The screw locking torque detection mechanism according to claim 1, characterized in that: The moving seat is provided with a second bearing supporting the rotation of the turntable, the turntable is provided with a first gear, the bottom of the moving seat is provided with a gear motor, and the gear motor is provided with a second gear meshing with the first gear.

5. The screw locking torque detection mechanism according to claim 1, characterized in that: The turntable is provided with a plurality of positioning holes on the same loop at intervals, the movable seat is provided with a positioning cylinder pointing to the positioning holes, and the positioning cylinder is provided with a positioning column pointing to the positioning holes.

6. The screw locking torque detection mechanism according to claim 1, characterized in that: A motor bracket is arranged below the moving seat, the torque measuring servo motor is arranged in the motor bracket and points to the torque measuring transmission shaft, and a first origin sensor corresponding to the torque measuring transmission shaft is arranged in the motor bracket.

7. The screw locking torque detection mechanism according to claim 1, characterized in that: Bumps are provided on both sides of the moving block to form a cross structure, the moving block mounting seat is provided with a guide rail located below the moving block, the moving block mounting seat is provided with a second spring located behind the bump to drive the moving block and the bump to move forward, and the moving block mounting seat is provided with a stopper located in front of the bump to limit the forward movement.

8. The screw locking torque detection mechanism according to claim 1, characterized in that: The moving seat is provided with a second origin sensor corresponding to the turntable.

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