Pressure-torsion combined force transducer for intelligent electric screwdriver

Abstract

A pressure-torsion combined force transducer for an intelligent electric screwdriver relates to the technical field of force measuring structures and comprises a motor connecting seat and a circular fixing table which are coaxially arranged in parallel, a measuring cylinder is arranged between the motor connecting seat and the circular fixing table, and a metal strain gauge group is arranged on the peripheral wall of the measuring cylinder. The electric screwdriver solves the problems that in the prior art, an electric screwdriver can not accurately measure and control downward pressure when a screw is twisted, the tightness of the screw is prone to being inconsistent in the operation process, and sometimes the phenomenon that the screw is damaged due to twisting is caused.

Description

Technical Field

[0001] This utility model relates to the field of force measurement structure technology, specifically to a pressure-torque combination force sensor for intelligent electric screwdrivers. Background Technology

[0002] Currently, ordinary electric screwdrivers do not have force sensors. Instead, they determine the torque by the motor's drive current. They cannot measure or control the downward pressure when tightening screws, thus failing to achieve precise control. This can easily lead to inconsistent screw tightness during operation and sometimes even damage to screws.

[0003] A prior art patent with publication number CN220472846U discloses a solution comprising, from top to bottom, a motor connector, a torque measuring cylinder, a circular fixed platform, a pressure measuring cylinder, and a bit support. A torque strain gauge is mounted on the outer circumferential surface of the torque measuring cylinder, and a pressure strain gauge is mounted on the outer circumferential surface of the pressure measuring cylinder or the upper end surface of the bit support. The combined pressure-torque force sensor further includes a bit mounting hole penetrating the motor connector, torque measuring cylinder, circular fixed platform, pressure measuring cylinder, and bit support. This invention can detect the torque and downward pressure of an electric screwdriver in real time during operation and adjust and control it in real time through external circuitry, thereby ensuring the quality of the finished product during screw tightening.

[0004] The shortcomings of existing technology have gradually become apparent with use, mainly in the following aspects:

[0005] Existing electric screwdrivers cannot accurately measure and control the downward pressure when tightening screws, which can easily lead to inconsistent screw tightness during operation and sometimes even damage to the screws.

[0006] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a pressure-torque combination force sensor for intelligent electric screwdrivers, which solves the problem that traditional electric screwdrivers cannot accurately measure and control the downward pressure when tightening screws, easily causing inconsistent screw tightness during operation, and sometimes even damaging the screws.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A pressure-torque combination force sensor for a smart electric screwdriver includes a motor connector and a circular fixed platform arranged coaxially. A measuring cylinder is provided between the motor connector and the circular fixed platform, and a group of metal strain gauges is provided on the peripheral wall of the measuring cylinder.

[0010] As an optimized solution, the metal strain gauge group includes a plurality of pressure-detecting metal strain gauges and torque-detecting metal strain gauges alternately and uniformly arranged around the periphery of the measuring cylinder.

[0011] As an optimized solution, the number of pressure-sensing metal strain gauges and torque-sensing metal strain gauges is four.

[0012] As an optimized solution, the outer circumference of the motor connector is provided with a wire-passing groove along the axial direction.

[0013] As an optimized solution, the outer circumference of the circular fixing platform is uniformly surrounded by a number of side threaded holes.

[0014] As an optimized solution, a support step with an outer diameter larger than the outer diameter of the circular fixed platform is fixedly connected to the outer ring of the circular fixed platform.

[0015] As an optimized solution, the lower end of the circular fixed platform is provided with an installation step whose outer diameter is smaller than that of the supporting step.

[0016] As an optimized solution, the bottom surface of the mounting step is evenly surrounded by a number of alternating bottom threaded holes and pin holes along the center.

[0017] As an optimized solution, a bearing placement groove is provided at the center of the bottom surface of the mounting step.

[0018] As an optimized solution, an adapter groove is provided at the top center of the motor connector.

[0019] As an optimized solution, the outer ring of the motor connector is provided with four countersunk holes that connect to the adapter slot.

[0020] As an optimized solution, the motor connector is provided with four screw clearance holes at the top position outside the adapter slot.

[0021] As an optimized solution, the sidewall of the adapter groove is surrounded by four semi-circular positioning pin holes.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] When the customer uses the device, they hold the motor housing and turn the screws down. This connects the motor to the sensor's motor connector, which is the fixed end. The electric screwdriver connector and screwdriver, which are connected to the motor's drive shaft, drive the bearing mounted on the circular fixed platform to rotate. At this time, the motor connector is in a fixed state, and the circular fixed platform is under stress. Therefore, the measuring cylinder in the middle can produce corresponding deformation, and the four sets of pressure detection metal strain gauges and torque detection metal strain gauges attached to it can produce corresponding resistance changes, thereby outputting a signal. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the wire-threading groove of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the adapter groove of this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the metal strain gauge assembly of this utility model.

[0029] In the diagram: 1-Motor connector; 2-Circular mounting platform; 3-Measuring cylinder; 4-Side threaded hole; 5-Support step; 6-Mounting step; 7-Support surface step; 8-Counterhead hole; 9-Bottom threaded hole; 10-Pin hole; 11-Bearing placement groove; 12-Adapter groove; 13-Screw clearance hole; 14-Positioning pin hole; 15-Wire groove; 16-Pressure detection metal strain gauge; 17-Torque detection metal strain gauge. Detailed Implementation

[0030] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0031] like Figures 1 to 4 As shown, the pressure-torque combination force sensor for intelligent electric screwdrivers includes a motor connector 1 and a circular fixed platform 2 arranged coaxially in parallel. A measuring cylinder 3 is provided between the motor connector 1 and the circular fixed platform 2, and a group of metal strain gauges is provided on the peripheral wall of the measuring cylinder 3.

[0032] The metal strain gauge assembly includes several pressure-detecting metal strain gauges 16 and torque-detecting metal strain gauges 17, which are alternately and uniformly arranged around the periphery of the measuring cylinder 3.

[0033] There are four pressure-sensing metal strain gauges 16 and four torque-sensing metal strain gauges 17.

[0034] The outer circle of the motor connector 1 is provided with a wire groove 15 for wiring along the axial direction. The output signal line of the sensor is connected to the motor control circuit through the wire groove 15.

[0035] The upper surface of the circular fixed platform 2 forms a support step 7 for the sensor bonding bridge circuit.

[0036] The measuring cylinder 3 has a hollow circle inside, which is mainly used to pass through the electric screwdriver connection assembly and can directly lead to the motor screwdriver bit.

[0037] The outer circumference of the circular mounting platform 2 is evenly surrounded by several side threaded holes 4 for fixing the motor housing.

[0038] A support step 5 with an outer diameter larger than the outer diameter of the circular fixed platform 2 is fixedly connected to the outer ring of the circular fixed platform 2 to support the motor housing.

[0039] The lower end of the circular fixed platform 2 is provided with an installation step 6 whose outer diameter is smaller than that of the supporting step 5.

[0040] The bottom surface of the mounting step 6 is evenly surrounded by several alternating bottom threaded holes 9 and pin holes 10 along the center.

[0041] A bearing placement groove 11 is provided at the center of the bottom surface of the mounting step 6.

[0042] The motor connector 1 has an adapter groove 12 at the top center for placing the motor adapter block.

[0043] The outer ring of the motor connector 1 has four countersunk holes 8 that connect to the adapter groove 12 for connecting the motor adapter block.

[0044] The motor connector 1 is surrounded by four screw clearance holes 13 at the top position outside the adapter groove 12 to prevent the reverse locking screws of the motor connector block from passing through.

[0045] The side wall of the adapter groove 12 is surrounded by four semi-circular positioning pin holes 14, which mainly cooperate with the semi-circular pin holes on the motor adapter block to play a positioning role.

[0046] The working principle of this device is as follows:

[0047] When the customer uses the device, they hold the motor housing and turn the screws down. This connects the motor to the motor connector 1 of the sensor, which is a fixed end. The electric screwdriver connector assembly and screwdriver connected to the motor drive shaft drive the bearing mounted on the circular fixed platform 2 to rotate. At this time, the motor connector 1 is in a fixed state, and the circular fixed platform 2 is under stress. Therefore, the measuring cylinder 3 in the middle can produce corresponding deformation, and the four sets of pressure detection metal strain gauges 16 and torque detection metal strain gauges 17 attached to it can produce corresponding resistance changes, thereby outputting a signal.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A torque-combination force sensor for intelligent electric screwdrivers, characterized in that: It includes a motor connector (1) and a circular fixed platform (2) arranged coaxially side by side. A measuring cylinder (3) is provided between the motor connector (1) and the circular fixed platform (2). A metal strain gauge assembly is provided on the peripheral wall of the measuring cylinder (3).

2. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 1, characterized in that: The metal strain gauge group includes a plurality of pressure-detecting metal strain gauges (16) and torque-detecting metal strain gauges (17) that are alternately and uniformly arranged around the periphery of the measuring cylinder (3).

3. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 2, characterized in that: The number of pressure detection metal strain gauges (16) and torque detection metal strain gauges (17) are both four.

4. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 1, characterized in that: The outer circle of the motor connector (1) is provided with a wire-passing groove (15) for wire routing along the axial direction.

5. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 1, characterized in that: The outer circumference of the circular fixed platform (2) is uniformly surrounded by a number of side threaded holes (4).

6. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 1, characterized in that: A support step (5) with an outer diameter larger than the outer diameter of the circular fixed platform (2) is fixedly connected to the outer ring of the circular fixed platform (2).

7. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 6, characterized in that: The lower end of the circular fixed platform (2) is provided with an installation step (6) whose outer diameter is smaller than that of the supporting step (5).

8. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 7, characterized in that: The bottom surface of the mounting step (6) is uniformly surrounded by a number of alternating bottom threaded holes (9) and pin holes (10) along the center.

9. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 7, characterized in that: A bearing placement groove (11) is provided at the center of the bottom surface of the mounting step (6).

10. The pressure-torque combination force sensor for an intelligent electric screwdriver according to claim 1, characterized in that: The motor connector (1) has a transfer groove (12) at the top center. The outer ring of the motor connector (1) has four countersunk holes (8) that connect to the transfer groove (12). The side wall of the transfer groove (12) has four semi-circular positioning pin holes (14). The top position of the motor connector (1) outside the transfer groove (12) has four screw clearance holes (13).

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