Torque sensor with rear speed reducer and intelligent electric tightening tool

Abstract

The invention discloses a speed reducer rear-mounted torque sensor and an intelligent electric tightening tool, the intelligent electric tightening tool comprises a shell, the shell is internally provided with the speed reducer rear-mounted torque sensor, and the speed reducer rear-mounted torque sensor comprises a sensor main body in a hollow cylinder shape; the left end and the right end of the sensor body are installed between the spline shaft sleeve and a first partition plate of the shell through cross keys, a first-stage sun gear is rotationally connected into a cavity in the rear side of the speed reducer, an inner gear ring meshed with the first-stage sun gear is arranged on the inner wall of the cavity, and the spline shaft is connected to the first-stage sun gear in a sleeving mode. A first output shaft of the motor penetrates through the first partition plate and is sleeved with the sensor body. According to the invention, the torsion moment of the first output shaft of the motor is detected through the torque sensor, the torsion moment is detected by detecting the counter-acting force of the inner gear ring through the torque sensor, and the output torque at the tail end of the motor is further detected, so that complete closed-loop control is achieved, the precision is highest, and a higher reduction ratio can be realized; and the efficiency of the speed reducer in the transmission process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tightening tools, and in particular to a torque sensor mounted after a reducer and an intelligent electric tightening tool. Background Art

[0002] Torque sensor, also known as torque sensor, torque sensor, torque sensor, torque meter, etc., is a device used to sense and detect torsional torque of various rotating or non-rotating mechanical parts. It can convert the physical changes of torque into accurate electrical signals.

[0003] Existing tightening tools achieve torque control by detecting the torque at the motor output end through a torque sensor, but ignore the efficiency of the reducer. In addition, traditional torque sensors are connected to flanges through threads. This method requires recalibration after installation due to the different tightening forces of each bolt, which is a cumbersome process. Summary of the Invention

[0004] The object of the present invention is to provide a torque sensor mounted after a reducer and an intelligent electric tightening tool to solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides a post-torque sensor for a reducer, comprising a sensor and a spline sleeve arranged between the reducer and the sensor, the sensor comprising a sensor body in the form of a hollow cylinder, the left and right ends of the sensor body being respectively connected to a left cross key and a right cross key, a left cross mounting groove corresponding to the left cross key being connected to the bearing surface of the spline sleeve, an O-ring being provided between the spline sleeve and the left cross key, a cavity being provided on the rear side of the reducer, a first-stage sun gear being rotatably connected in the cavity, an inner gear ring being provided on the inner wall of the cavity, the inner gear ring being meshed with the first-stage sun gear, and the spline sleeve being connected to the first-stage sun gear.

[0006] As a preferred technical solution of the present invention, the rear end of the reducer is connected to a spline sleeve via side screws.

[0007] The present invention also provides an intelligent electric tightening tool, comprising a shell, in which the above-mentioned reducer post-torque sensor is arranged, and a motor is also arranged in the shell. A first partition is provided in the shell between the reducer post-torque sensor and the motor. The first partition is located on one side of the reducer post-torque sensor and is connected to a right cross mounting groove corresponding to the right cross key. The first output shaft of the motor passes through the first partition and is sleeved on the sensor body, and its end is sleeved on the spline shaft sleeve.

[0008] As a preferred technical solution of the present invention, a quick-change joint is provided at the front end of the shell, and the front end of the shell is connected to a front cover which is sleeved on the quick-change joint. The front cover is provided with fine threads, and the front cover is threadedly connected to the shell through the fine threads.

[0009] As a preferred technical solution of the present invention, a bearing assembly is provided in the front cover, and the quick-change joint is connected to the second output shaft of the reducer through the bearing assembly. The bearing assembly includes a sleeve arranged on one side of the reducer, one end of the sleeve is connected to the second output shaft through a hexagon socket bolt, and the other end is sleeved on the quick-change joint, a bearing seat is sleeved on the sleeve, and one end of the bearing seat is connected to a front bearing, and the front bearing is arranged on the inner side of the front cover.

[0010] As a preferred technical solution of the present invention, the motor is threadedly connected in the housing, a magnet is provided on the side of the motor away from the first output shaft, and a magnetic encoder is connected through a support plate, and the magnetic encoder is provided directly behind the magnet.

[0011] As a preferred technical solution of the present invention, the rear end of the shell is provided with an aviation socket, and the rear end of the shell is connected to a back cover that is sleeved on the aviation socket. The rear end of the shell is connected to a lamp holder through side screws, and a lamp ring is installed on the lamp holder through screws.

[0012] As a preferred technical solution of the present invention, the shell is also provided with a PCB main control board, a second partition is provided in the shell between the motor and the PCB main control board, and a switch assembly is provided in the shell between the second partition and the back cover, the switch assembly includes a sliding groove opened on the surface of the shell between the second partition and the back cover, a sliding button is provided above the sliding groove, a sliding block slidably connected to the sliding groove is connected below the sliding button, a sliding switch is provided below the sliding block, and the sliding switch includes two groups of static contacts for controlling the forward and reverse directions of the motor, the two groups of static contacts are provided on the PCB main control board, a moving contact is slidably connected between the two groups of static contacts, and the moving contact is connected to the bottom of the sliding block.

[0013] As a preferred technical solution of the present invention, the switch assembly also includes a mounting groove opened on the surface of the shell between the second partition and the back cover, the mounting groove is arranged opposite to the sliding groove, a large button is arranged above the mounting groove, the shell is rotatably connected to the rotating rod, and one end of the large button is rotatably connected to the shell through the rotating rod, the PCB main control board is located on the other side of the static contact piece. A slot-type photoelectric switch is provided, and a contact piece that triggers the slot-type photoelectric switch to disconnect is provided at the bottom of the large button.

[0014] As a preferred technical solution of the present invention, the surface of the shell is provided with an anti-slip groove, and the back cover is rotatably connected with a hook.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The torque sensor after the reducer of the present invention adopts a static torque sensor to avoid the complex design of the dynamic torque sensor with difficult wiring. The sensor includes a sensor body in the form of a hollow cylinder. The sensor body is connected to the first partition and the spline sleeve respectively through the cross keys at both ends, so that the entire sensor is suspended in the air. In this way, the problem of the traditional torque sensor requiring recalibration after installation due to the different tightening forces of each bolt connected to the flange through the thread is avoided, and the assembly process is simplified. An O-ring is provided between the cross key and the cross mounting groove. The setting of the O-ring reduces the tolerance design requirements and the manufacturing and installation requirements, and achieves the purpose of adjusting the warning force and reducing the tolerance requirements without increasing the error of the torque sensor caused by uneven force due to the rigid connection.

[0016] (2) The present invention passes through the first partition through the first output shaft of the motor and is sleeved with the sensor body, and a spline sleeve is sleeved on the end thereof, and the spline sleeve is sleeved on the first-stage sun gear, and the first-stage sun gear is rotatably connected to the inner cavity on the rear side of the reducer. An inner gear ring meshing with the first-stage sun gear is provided on the inner wall of the inner cavity, so that the torsional torque of the output shaft of the motor is detected by the torque sensor, and the torsional torque is detected by the torque sensor while the reaction force of the inner gear ring is detected to further detect the output torque of the motor end, thereby achieving complete closed-loop control with the highest accuracy, and at the same time, achieving a higher reduction ratio, ensuring the coaxiality of the intermediate shaft system after installation, and improving the efficiency of the reducer during the transmission process.

[0017] (3) The present invention combines a magnet and a magnetic encoder with a reducer and a motor. The magnetic encoder detects the magnetic field position of the motor rotor and provides accurate motor speed and position signals. At the same time, the intelligent electric tightening tool can be braked, forward and reversed by a sliding switch, and can be started, waited for and shut down by a slot-type photoelectric switch, thereby achieving high-precision torque control and screw tightening, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution in this embodiment, the following briefly introduces the drawings required for use in the embodiment or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is an exploded view of the torque sensor mounted after the reducer of this embodiment.

[0020] Figure 2 Schematic diagram of the overall structure of the intelligent electric tightening tool of this embodiment.

[0021] Figure 3 FIG. 4 is an exploded view of the intelligent electric tightening tool of this embodiment.

[0022] Figure 4 This is a front cross-sectional view of the intelligent electric tightening tool of this embodiment.

[0023] Figure 5 for Figure 4 Enlarged view of point A.

[0024] In the figure: housing 1, reducer 2, second output shaft 201, sensor 3, sensor body 301, left cross key 302, right cross key 303, O-ring 304, motor 4, first output shaft 401, spline shaft sleeve 5, left cross mounting groove 501, switch assembly 6, sliding groove 601, sliding button 602, sliding block 603, sliding switch 604, static contact piece 6041, dynamic contact piece 6042, mounting groove 605, large button 60 6. Slot-type photoelectric switch 607, contact piece 608, bearing assembly 7, bushing 701, bearing seat 702, front bearing 703, first partition 8, right cross mounting slot 801, first-stage sun gear 9, quick-change connector 10, front cover 11, magnet 12, magnetic encoder 13, aviation socket 14, rear cover 15, lamp holder 16, light ring 17, PCB main control board 18, second partition 19, anti-slip groove 20, hook 21, fine thread 22, hexagon socket bolt 23. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the embodiments.

[0026] Example 1 like Figure 1 As shown, this embodiment provides a post-speed reducer torque sensor, including a sensor 3 and a spline sleeve 5 arranged between the speed reducer 2 and the sensor 3. The sensor 3 includes a sensor body 301 in the form of a hollow cylinder. The left and right ends of the sensor body 301 are respectively connected to a left cross key 302 and a right cross key 303. The bearing surface of the spline sleeve 5 is connected to a left cross mounting groove 501 corresponding to the left cross key 302. An O-ring 304 is provided between the spline sleeve 5 and the left cross key 302. A cavity is opened on the rear side of the speed reducer 2, and a primary sun gear 9 is rotatably connected in the cavity. An inner gear ring is provided on the inner wall of the cavity, and the inner gear ring is engaged with the primary sun gear 9. The spline sleeve 5 is connected to the primary sun gear 9.

[0027] In this embodiment, the rear end of the reducer 2 is connected to a spline sleeve 5 via side screws.

[0028] Specifically, the spline sleeve 5 is connected to the rear end of the reducer by side screws to facilitate its installation and disassembly.

[0029] Example 2 like Figures 2 to 5 As shown, this embodiment provides an intelligent electric tightening tool, including a shell 1, in which the reducer post-torque sensor of Example 1 is arranged, and a motor 4 is also arranged in the shell 1. A first partition 8 is provided in the shell 1 between the reducer post-torque sensor and the motor 4. The first partition 8 is located on one side of the reducer post-torque sensor and is connected to a right cross mounting groove 801 corresponding to the right cross key 303. The first output shaft 401 of the motor 4 passes through the first partition 8 and is sleeved on the sensor body 301, and its end is sleeved on the spline shaft sleeve 5.

[0030] In this embodiment, if Figure 3 As shown, a quick-change connector 10 is provided at the front end of the housing 1 , and a front cover 11 is connected to the front end of the housing 1 and is sleeved on the quick-change connector 10 . The front cover 11 is provided with fine threads 22 , and the front cover 11 is threadedly connected to the housing 1 through the fine threads 22 .

[0031] Specifically, the provision of the fine threads 22 improves the strength of the fastener between the front cover 11 and the housing 1 and prevents the front cover 11 and the housing 1 from loosening due to vibration caused by the operation of the tightening tool.

[0032] In this embodiment, if Figure 3 and Figure 4 As shown, a bearing assembly 7 is provided in the front cover 11, and the quick-change connector 10 is connected to the second output shaft 201 of the reducer 2 through the bearing assembly 7. The bearing assembly 7 includes a sleeve 701 provided on one side of the reducer 2, one end of the sleeve 701 is connected to the second output shaft 201 through a hexagon socket bolt 23, and the other end is sleeved on the quick-change connector 10, a bearing seat 702 is sleeved on the sleeve 701, and one end of the bearing seat 702 is connected to a front bearing 703, and the front bearing 703 is provided on the inner side of the front cover 11.

[0033] Specifically, a front bearing 703 is designed at the end of the bearing seat 702 to ensure the coaxiality of the reducer 2 during use.

[0034] In this embodiment, if Figure 3 and Figure 4 As shown, the motor 4 is threadedly connected to the housing 1 , a magnet 12 is provided on the side of the motor 4 away from the first output shaft 401 , and a magnetic encoder 13 is connected via a support plate. The magnetic encoder 13 is provided directly behind the magnet 12 .

[0035] Specifically, the magnet 12 and the magnetic encoder 13 are combined with the motor 4 , and the magnetic encoder 13 detects the magnetic field position of the rotor of the motor 4 and provides accurate speed and position signals of the motor 4 .

[0036] In this embodiment, if Figures 2-4As shown, an aviation socket 14 is provided at the rear end of the housing 1 , and a rear cover 15 that is sleeved on the aviation socket 14 is connected to the rear end of the housing 1 .

[0037] Specifically, the aviation socket 14 is provided so that an external aviation plug can be plugged into the aviation socket 14 to power the device.

[0038] In this embodiment, if Figure 3 and Figure 4 As shown, the rear end of the housing 1 is connected to a lamp holder 16 via side screws, and a lamp ring 17 is mounted on the lamp holder 16 via screws.

[0039] Specifically, the status indication of the motor 4 under different working conditions is realized by setting the lamp holder 16 and the lamp ring 17. In this embodiment, if Figure 3 and Figure 4 As shown, the housing 1 is also provided with a PCB main control board 18, and a second partition 19 is provided in the housing 1 between the motor 4 and the PCB main control board 18. The housing 1 is provided with a switch assembly 6 between the second partition 19 and the back cover 15. The switch assembly 6 includes a sliding groove 601 opened on the surface of the housing 1 between the second partition 19 and the back cover 15, a sliding button 602 is provided above the sliding groove 601, and a sliding block 603 slidably connected to the sliding groove 601 is connected below the sliding button 602. A sliding switch 604 is provided below the sliding block 603, and the sliding switch 604 includes two groups of static contact pieces 6041 for controlling the forward and reverse directions of the motor 4. The two groups of static contact pieces 6041 are provided on the PCB main control board 18, and a dynamic contact piece 6042 is slidably connected between the two groups of static contact pieces 6041, and the dynamic contact piece 6042 is connected to the bottom of the sliding block 603.

[0040] Specifically, the sliding block 603 slides in the sliding groove 601 , so that the moving contact piece 6042 and the two groups of static contact pieces 6041 are in contact and switched, thereby realizing the forward and reverse rotation direction switching of the motor 4 .

[0041] In this embodiment, if Figure 3 and Figure 4 As shown, the switch assembly 6 also includes a mounting groove 605 opened on the surface of the shell 1 between the second partition 19 and the back cover 15. The mounting groove 605 is arranged opposite to the sliding groove 601. A large button 606 is arranged above the mounting groove 605. The shell 1 is rotatably connected to the rotating rod, and one end of the large button 606 is rotatably connected to the shell 1 through the rotating rod. The PCB main control board 18 is provided with a slot-type photoelectric switch 607 on the other side of the static contact piece 6041, and a contact piece 608 is provided at the bottom of the large button 606 to trigger the slot-type photoelectric switch 607 to disconnect.

[0042] Specifically, the contact piece 608 is used to cut off the infrared light emitting tube in the slot-type photoelectric switch 607 from emitting infrared light to the infrared light receiving tube, so that the slot-type photoelectric switch 607 is closed, that is, the motor 4 is powered on and the tightening tool is started; the contact piece 608 is moved away from the slot-type photoelectric switch 607 so that the infrared light receiving tube can receive the infrared light from the infrared light emitting tube, so that the slot-type photoelectric switch 607 is opened, that is, the motor 4 is powered off and the tightening tool is turned off.

[0043] In this embodiment, if Figure 2 and Figure 3 As shown, the surface of the housing 1 is provided with an anti-slip groove 20, so that the device can be held under high torque to prevent it from slipping out of the hands and injuring the operator.

[0044] In this embodiment, if Figure 2 and Figure 3 As shown, a hook 21 is rotatably connected to the rear cover 15 so that the tightening tool can be hung up for use when not in use.

[0045] The working principle of this embodiment is as follows: before use, select the corresponding screwdriver bit according to the type and size of the screw to be tightened, and install the screwdriver bit to the quick-change connector 10, then plug the external aviation plug into the aviation socket 14, so that the motor 4 and the light ring 17 are powered on; when in use, align the front end of the screwdriver bit with the needle of the screw, directly press the large button 606, and the contact piece 608 cuts off the infrared light emitting tube in the slot-type photoelectric switch 607 and transmits infrared light to the infrared light receiving tube, so that the slot-type photoelectric switch 607 is turned off, that is, the motor 4 is powered on, and the tightening tool is started. At this time, the motor 4 rotates in the positive direction When the screw is rotated counterclockwise, the sliding button 602 is moved, and the sliding block 603 slides in the sliding groove 601, so that the moving contact piece 6042 switches from one set of static contact pieces 6041 to another set of static contact pieces 6041, realizing the forward and reverse direction conversion of the motor 4. The motor 4 rotates in the reverse direction, so that the screw is rotated counterclockwise, and the light ring 17 displays the color light corresponding to the counterclockwise rotation of the motor 4. When tightening the screws, the torque sensor 3 detects the torque force of the first output shaft 401 of the motor 4. At the same time, since the first-stage sun gear 9 is engaged with the inner ring gear on the inner wall of the cavity of the reducer 2, the torque sensor 3 detects the reaction force of the inner ring gear to detect the torsional moment, and further detects the output torque at the end of the motor 4, achieving complete closed-loop control with the highest accuracy.

[0046] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A torque sensor mounted after a reducer, comprising a sensor and a spline sleeve (5) arranged between the reducer (2) and the sensor, characterized in that: The sensor comprises a sensor body (301) in the form of a hollow cylinder, the left and right ends of the sensor body (301) are respectively connected to a left cross key (302) and a right cross key (303), the bearing surface of the spline shaft sleeve (5) is connected to a left cross mounting groove (501) corresponding to the left cross key (302), an O-type sealing ring (304) is provided between the spline shaft sleeve (5) and the left cross key (302), a cavity is provided on the rear side of the reducer (2), a first-stage sun gear (9) is rotatably connected in the cavity, an inner gear ring is provided on the inner wall of the cavity, the inner gear ring is meshed with the first-stage sun gear (9), and the spline shaft sleeve (5) is connected to the first-stage sun gear (9).

2. The post-speed reducer torque sensor according to claim 1, characterized in that: The rear end of the reducer (2) is connected to a spline sleeve (5) via side screws.

3. An intelligent electric tightening tool, comprising a housing (1), characterized in that: The housing (1) is provided with the above-mentioned speed reducer post-torque sensor, and the housing is also provided with a speed reducer (2) and a motor (4). A first partition (8) is provided in the housing between the speed reducer post-torque sensor and the motor (4). The first partition (8) is located on one side of the speed reducer post-torque sensor and is connected to a right cross mounting groove (801) corresponding to the right cross key (303). The first output shaft (401) of the motor (4) passes through the first partition (8) and is sleeved with the sensor body (301), and its end is sleeved with the spline shaft sleeve (5).

4. A sensor-type intelligent electric tightening tool according to claim 3, characterized in that: A quick-change connector (10) is provided at the front end of the housing (1), and the front end of the housing (1) is connected to a front cover (11) sleeved on the quick-change connector (10), the front cover (11) is provided with fine threads (22), and the front cover (11) is threadedly connected to the housing (1) via the fine threads (22).

5. The sensor-type intelligent electric tightening tool according to claim 4, characterized in that: A bearing assembly (7) is provided in the front cover (11), and the quick-change joint (10) is connected to the second output shaft (201) of the reducer (2) through the bearing assembly (7). The bearing assembly (7) includes a shaft sleeve (701) provided on one side of the reducer (2), one end of the shaft sleeve (701) is connected to the second output shaft (201) through a hexagon socket bolt (23), and the other end is sleeved on the quick-change joint (10), a bearing seat (702) is sleeved on the shaft sleeve (701), and one end of the bearing seat (702) is connected to a front bearing (703), and the front bearing (703) is provided on the inner side of the front cover (11).

6. The sensor-type intelligent electric tightening tool according to claim 3, characterized in that: The motor (4) is threadedly connected to the housing (1). A magnet (12) is provided on the side of the motor (4) away from the first output shaft (401), and a magnetic encoder (13) is connected via a support plate. The magnetic encoder (13) is provided directly behind the magnet (12).

7. The sensor-type intelligent electric tightening tool according to claim 3, characterized in that: The rear end of the housing (1) is provided with an aviation socket (14), and the rear end of the housing (1) is connected to a rear cover (15) sleeved on the aviation socket (14). The rear end of the housing (1) is connected to a lamp holder (16) via side screws, and a lamp ring (17) is mounted on the lamp holder (16) via screws.

8. The sensor-type intelligent electric tightening tool according to claim 7, characterized in that: The housing (1) is further provided with a PCB main control board (18); a second partition (19) is provided in the housing (1) between the motor (4) and the PCB main control board (18); a switch assembly (6) is provided in the housing (1) between the second partition (19) and the back cover (15); the switch assembly (6) comprises a sliding groove (601) provided on the surface of the housing (1) between the second partition (19) and the back cover (15); a sliding button (602) is provided above the sliding groove (601); the sliding button A sliding block (603) is connected below (602) and is slidably connected to the sliding groove (601). A sliding switch (604) is provided below the sliding block (603). The sliding switch (604) includes two groups of static contact pieces (6041) for controlling the forward and reverse rotation directions of the motor (4). The two groups of static contact pieces (6041) are provided on the PCB main control board (18). A dynamic contact piece (6042) is slidably connected between the two groups of static contact pieces (6041). The dynamic contact piece (6042) is connected to the bottom of the sliding block (603).

9. The sensor-type intelligent electric tightening tool according to claim 8, characterized in that: The switch assembly (6) further comprises a mounting groove (605) provided on the surface of the housing (1) between the second partition (19) and the rear cover (15), the mounting groove (605) being arranged opposite to the sliding groove (601), a large button (606) being arranged above the mounting groove (605), a rotating rod being rotatably connected in the housing (1), and one end of the large button (606) being rotatably connected to the housing (1) via the rotating rod, a slot-type photoelectric switch (607) being arranged on the other side of the static contact piece (6041) on the PCB main control board (18), and a contact piece (608) for triggering the disconnection of the slot-type photoelectric switch (607) being arranged at the bottom of the large button (606).

10. The sensor-type intelligent electric tightening tool according to claim 7, characterized in that: The surface of the housing (1) is provided with an anti-slip groove (20), and the rear cover (15) is rotatably connected with a hook (21).

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