Torque sensor electric screwdriver

Abstract

The application provides a screwdriver with pressure and torque sensors, which has a shell, a rotating motor, a main shaft and other components, can meet the normal work of the screwdriver, and can detect radial torque data and pressure data at the same time by integrating a first sensor body and a second sensor body, so that the screwdriver can more accurately control the torque and the vertical force during the operation, thereby improving the assembly accuracy and controllability. The first sensor body and the second sensor body are reasonably designed and are sleeved on the outer circle of the main shaft and connected with the shell. This structure design not only ensures the stability and durability of the sensor, but also avoids the direct connection of the sensor with the main shaft or the rotating motor, thereby reducing the risk of sensor damage. Compared with the traditional screwdriver, the screwdriver with pressure and torque sensors of the application has been significantly improved in function. In addition to the basic rotation function, it can also monitor and feedback the torque and pressure data in real time.

Description

Technical Field

[0001] This invention relates to the field of electric screwdriver technology, and in particular to an electric screwdriver with a pressure-torque sensor. Background Technology

[0002] An electric screwdriver, also known as an electric screwdriver or electric screwdriver, is a power tool used for tightening and loosening screws and nuts. It is an indispensable tool in the assembly industry. In automated assembly processes, the performance of the electric screwdriver, as a commonly used tightening tool, directly affects assembly quality and production efficiency.

[0003] Traditional electric screwdrivers typically only offer a single rotation function and cannot monitor and provide real-time torque data, limiting their application in high-precision operations. To meet the demands of high-precision work, some electric screwdrivers with built-in torque sensors have emerged on the market. These screwdrivers use built-in torque sensors to monitor and provide real-time torque data, thereby improving the accuracy and controllability of the operation. However, existing electric screwdrivers with torque sensors typically only collect radial torque data and cannot simultaneously collect downward pressure data.

[0004] Therefore, it is necessary to provide an electric screwdriver with a pressure and torque sensor to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides an electric screwdriver with a torque sensor to solve the problem that existing electric screwdrivers often have unreasonable structural designs, resulting in insufficient real-time monitoring and feedback of torque and pressure data.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: an electric screwdriver with a pressure-torsion sensor, comprising:

[0007] shell;

[0008] A rotating motor is disposed inside the housing, and a rotating part is provided at the bottom end of the rotating motor, and a drive shaft is provided at the rotating part;

[0009] A main spindle, disposed within the housing, is connected at one end to the drive shaft and at the other end to a bit; and

[0010] The first sensor body has a hollow cylindrical structure and is fitted onto the outer ring of the main shaft. The top end of the first sensor body is connected to the rotating part, and the outer side of the bottom end of the first sensor body is connected to the outer shell. A first strain gauge is disposed in the middle of the first sensor body for collecting radial torque data.

[0011] The second sensor body is a circular ring structure. The second sensor body is sleeved on the outer ring of the main shaft. The second sensor body is connected to the outer shell and the main shaft. The second sensor is equipped with a second strain gauge, which is used to collect downward pressure and radial torque data.

[0012] In this invention, the electric screwdriver with pressure and torque sensor further includes:

[0013] A motor flange is fitted onto the outer ring of the drive shaft, and the top of the motor flange is connected to the rotating part.

[0014] A first sensor flange, which is connected to the motor flange, and the inner ring of the first sensor flange engages with the outer ring of the first sensor body; and

[0015] An anti-collision isolation ring is located between the outer shell and the first sensor flange, and the anti-collision isolation ring is sleeved on the outer ring of the first sensor flange.

[0016] In this invention, the electric screwdriver with pressure and torque sensor further includes:

[0017] An elastic element is disposed between the drive shaft and the main shaft, and the elastic element elastically presses the main shaft away from the drive shaft.

[0018] In this invention, a first limiting piece is provided on the outer side of the spindle; the electric screwdriver with pressure and torque sensor further includes:

[0019] A second sensor flange, the top of the inner ring of the second sensor flange is connected to the bottom end of the first sensor body, the outer side of the bottom end of the second sensor is connected to the outer casing, and the second sensor body is located inside the second sensor flange; and

[0020] A planar bearing is sleeved on the outside of the main shaft, and the planar bearing is disposed between the first limiting piece and the second sensor body.

[0021] In this invention, the first sensor body includes:

[0022] The first connecting part is located at the top of the first sensor body and is connected to the first sensor flange.

[0023] A second connecting part is located at the bottom end of the first sensor body, and the second connecting part is connected to the second sensor flange; and

[0024] The deformation part is located in the middle of the first sensor body, and the cross-sectional diameter of the deformation part is smaller than the cross-sectional diameter of the first connecting part and the cross-sectional diameter of the second connecting part. The first strain device is connected to the outside of the deformation part.

[0025] In this invention, the electric screwdriver with pressure and torque sensor further includes a second limiting piece, which is disposed inside the second sensor flange and located between the first sensor body and the second sensor body, thereby limiting the position of the second sensor body.

[0026] In this invention, the outer shell includes:

[0027] The main housing is a hollow cylindrical structure with an opening at its bottom end, and the rotating motor is located inside the main housing;

[0028] A front cover, located below the main housing, is used to close the opening; the second sensor body is connected to the front cover; and

[0029] A connector connects the main housing to the front cover.

[0030] In this invention, a slot is provided at the top of the spindle, the drive shaft is inserted into the slot, and the elastic element is disposed in the slot.

[0031] In this invention, the outer ring of the first connecting part has a polygonal cross-sectional structure, and the inner ring cross-sectional structure of the first sensor flange matches the outer ring cross-sectional structure at the top of the first sensor flange.

[0032] In this invention, the electric screwdriver with pressure and torque sensor further includes:

[0033] A deep groove ball bearing is sleeved on the main shaft; the inner ring of the deep groove ball bearing is connected to the bottom end of the first limiting plate; and the outer side of the deep groove ball bearing is connected to the flange of the second sensor.

[0034] A retaining ring is disposed inside the second sensor flange. The retaining ring is located at the bottom end of the outer ring of the deep groove ball bearing and is used to define the position of the deep groove ball bearing.

[0035] In this invention, the electric screwdriver with pressure and torque sensor further includes:

[0036] Mounting plate, connected to the flange of the second sensor; and

[0037] An electrostatic brush is disposed on the mounting plate and located on the side of the spindle. The electrostatic brush is used to eliminate static electricity from the spindle.

[0038] Compared to existing technologies, the advantages of this invention are as follows: The electric screwdriver with a torque sensor of this invention, with its housing, rotating motor, spindle, and other components, meets the normal use requirements of the electric screwdriver. By integrating a first sensor body and a second sensor body, the electric screwdriver with a torque sensor of this application can simultaneously collect radial torque data and downward pressure data. This comprehensive data acquisition capability allows the electric screwdriver to more accurately control torque and vertical force during operation, thereby improving assembly accuracy and controllability. The first and second sensor bodies are rationally designed, respectively fitted onto the outer ring of the spindle and connected to the housing. This structural design not only ensures the stability and durability of the sensors but also avoids direct connection between the sensors and the spindle or rotating motor, reducing the risk of sensor damage. Compared to traditional electric screwdrivers, the electric screwdriver with a torque sensor of this application has significantly improved functionality. In addition to basic rotation functions, it can also monitor and provide feedback on torque and downward pressure data in real time. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of the present invention.

[0040] Figure 1 This is a perspective view of the overall structure of the electric screwdriver with a pressure-torsion sensor according to a preferred embodiment of the present invention.

[0041] Figure 2 This is a cross-sectional view of the overall structure of the electric screwdriver with a pressure-torsion sensor according to a preferred embodiment of the present invention.

[0042] Figure 3 This is a schematic diagram of the connection structure between the first sensor body and the second sensor body and the main shaft, which is a preferred embodiment of the present invention.

[0043] Figure 4 This is an exploded view of the overall structure of the electric screwdriver with a pressure-torsion sensor according to a preferred embodiment of the present invention.

[0044] Reference numerals: 11, outer casing; 111, main casing; 112, front cover; 113, connector; 12, rotating motor; 121, rotating part; 122, drive shaft; 123, motor flange; 13, main shaft; 131, first limiting piece; 132, slot; 14, first sensor body; 141, first connecting part; 142, deformable part; 143, second connecting part; 15, second sensor body; 16, bit; 17, first sensor flange; 171, first receiving groove; 172, first fixing groove; 18, anti-collision isolation ring; 19, elastic element; 20, second sensor flange; 201, second receiving groove; 202, first through hole; 203, second fixing groove; 21, flat bearing; 22, second limiting piece; 23, deep groove ball bearing; 24, retaining ring; 25, mounting plate; 26, electrostatic brush. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The directional terms mentioned in this invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this invention, and are not intended to limit this invention.

[0047] The terms "first" and "second" used in the terminology of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as limiting the order of events.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The following is a preferred embodiment of an electric screwdriver with a torque sensor that can solve the above-mentioned technical problems provided by the present invention.

[0050] Please refer to Figure 1 and Figure 2 and Figure 3,in Figure 1 This is a perspective view of the overall structure of the electric screwdriver with a pressure-torque sensor according to a preferred embodiment of the present invention. Figure 2 This is a cross-sectional view of the overall structure of the electric screwdriver with a pressure-torsion sensor according to a preferred embodiment of the present invention.

[0051] In the diagram, units with similar structures are represented by the same labels.

[0052] This invention provides an electric screwdriver with a torque sensor, comprising a housing 11, a rotary motor 12, a main shaft 13, a first sensor body 14, and a second sensor body 15. The rotary motor 12 is disposed within the housing 11, with a rotating part 121 at its bottom end and a drive shaft 122 mounted on the rotating part 121. The main shaft 13 is disposed within the housing 11, with one end connected to the drive shaft 122 and the other end having a screwdriver bit 16 extending through the bottom end of the housing 11 and used to contact screws. The first sensor body 14 is a hollow cylindrical structure. The sensor body 14 is sleeved on the outer ring of the main shaft 13. The top of the first sensor body 14 is connected to the rotating part 121, and the outer side of the bottom end of the first sensor body 14 is connected to the outer shell 11. A first strain device is provided in the middle of the first sensor body 14, which is used to collect radial torque data. The second sensor body 15 is a ring structure. The second sensor body 15 is sleeved on the outer ring of the main shaft 13. The second sensor body 15 is connected to the outer shell 11 and the main shaft 13. The second sensor is provided with a second strain device, which is used to collect downward pressure data.

[0053] This electric screwdriver has key components such as a housing 11, a rotating motor 12, and a spindle 13, which can meet the normal use requirements of an electric screwdriver. It collects radial torque and downward pressure data through two sensors (a first sensor body 14 and a second sensor body 15), improving the control precision and torque feedback accuracy of the electric screwdriver during tightening operations. The first sensor body 14 is fitted around the outer ring of the spindle 13. The rotating motor 12 and the spindle 13 are connected and driven inside the first sensor body 14, ensuring stable rotation of the screwdriver bit 16 while the spindle 13 drives it. The top of the first sensor body 14 is connected to the rotating part 121, and the bottom is connected to the housing 11, forming a tight structural connection. Torque is generated between the upper and lower parts of the first sensor body 14 for detection. The first sensor body 14 can effectively transmit torque force, avoiding energy loss and sensor displacement. The second sensor body 15 is fitted around the outer ring of the spindle 13 and maintains a stable connection with both the housing 11 and the spindle 13. During tightening operations, when the screwdriver bit 16 contacts the screw and applies pressure, the spindle 13 will be subjected to a reaction force from the screw. This reaction force includes the downward pressure data in the vertical direction. The second strain device on the second sensor body 15 can detect this, preventing the electric screwdriver from being accidentally started when not tightening screws, thus improving the safety of the electric screwdriver during use.

[0054] The connection structure of the first sensor body 14 in this embodiment is described below:

[0055] Combination Figure 2 and Figure 3In this embodiment, the electric screwdriver with a torque sensor also includes a motor flange 123, a first sensor flange 17, and an anti-collision isolation ring 18. The motor flange 123 is fitted around the outer ring of the drive shaft 122, and the top of the motor flange 123 is connected to the rotating part 121. The first sensor flange 17 is connected to the motor flange 123, and the inner ring of the first sensor flange 17 engages with the outer ring of the first sensor body 14. The anti-collision isolation ring 18 is located between the outer shell 11 and the first sensor flange 17, and is fitted around the outer ring of the first sensor flange 17. The design of the motor flange 123, the first sensor flange 17, and the anti-collision isolation ring 18 enhances the stability and safety of the internal structure of the electric screwdriver. The anti-collision isolation ring 18 effectively prevents direct collision between the outer shell 11 and the first sensor flange 17, improving the durability of the product. When the first sensor body 14 is subjected to a horizontal force, the force is first applied to the first sensor flange 17 through the anti-collision isolation ring 18. This protects the deformation plane of the first sensor body 14 from the influence of the horizontal force, ensuring the accuracy of the detection by the first sensor body 14. The first sensor flange 17 works in conjunction with the anti-collision isolation ring 18 to fill the gap between the first sensor flange 17 and the outer casing 11. When the electric screwdriver is tilted, the first sensor body 14 will not collide with the outer casing 11. This structural design is used to isolate the torque between the outer casing 11 and the first sensor body 14.

[0056] In this embodiment, a first receiving groove 171 is provided on the outer side of the first sensor flange 17, and the anti-collision isolation ring 18 is fitted into the first receiving groove 171. The design of the first receiving groove 171 allows the anti-collision isolation ring 18 to be more securely fitted into the outer side of the first sensor flange 17, further enhancing the stability of the structure.

[0057] In this embodiment, the outer ring of the top end of the first sensor body 14 has a polygonal cross-section, and the inner ring of the first sensor flange 17 matches the outer ring of the top end of the first sensor body 14. The polygonal design increases the contact area and friction between the first sensor flange 17 and the connecting component, thus improving the stability of the connection.

[0058] Combination Figure 3 and Figure 4In this embodiment, the first sensor body 14 includes a first connecting portion 141, a second connecting portion 143, and a deformation portion 142. The first connecting portion 141 is located at the top of the first sensor body 14 and is connected to the first sensor flange 17. The second connecting portion 143 is located at the bottom of the first sensor body 14 and is connected to the outer casing 11. The deformation portion 142 is located in the middle of the sensor body, and the cross-sectional diameter of the deformation portion 142 is smaller than the cross-sectional diameters of the first connecting portion 141 and the second connecting portion 143. A first strain gauge is connected to the outside of the deformation portion 142. The upper part of the first sensor body 14 is connected to the motor flange 123 through the first sensor flange 17. The lower part of the first sensor body 14 is connected to the outer casing 11. The first strain gauge installed in the deformation portion 142 can detect the torque difference between the upper and lower parts of the first sensor body 14.

[0059] The connection between the first sensor body 14 and the first sensor flange 17 is described below:

[0060] Combination Figure 2 and Figure 3 The first sensor flange 17 includes a first fixing part and a second fixing part; the top end of the first fixing part is connected to the motor flange 123 by screws; and a first fixing groove 172 is provided in the first fixing part, the first fixing groove 172 is inserted into the first connecting part 141, the first fixing part and the first fixing groove 172 are engaged and connected, the first connecting part 141 has a polygonal structure, and the inner wall structure of the first fixing groove 172 matches the structure of the first connecting part 141.

[0061] The second fixing part is located at the bottom end of the first fixing part and extends downward. In this embodiment, the second fixing part is located outside the deformation part 142, and a space for installing the first strain device is formed between the inner side of the second fixing part and the deformation part 142, thereby improving the compactness of the electric screwdriver structure.

[0062] The connection structure between the main shaft 13 and the rotary motor 12 in this embodiment is described below:

[0063] Combination Figure 3 and Figure 4 The electric screwdriver with pressure and torque sensor in this embodiment also includes an elastic element 19. The elastic element 19 is disposed between the drive shaft 122 and the main shaft 13. The elastic element 19 elastically squeezes the main shaft 13 away from the drive shaft 122, which improves the tighter connection between the main shaft 13 and the screw bit 16 during the use of the electric screwdriver.

[0064] Furthermore, a slot 132 is provided at the top of the spindle 13, and the drive shaft 122 is inserted into the slot 132. The elastic element 19 is set in the slot 132. The structure is simple and compact, making it easy to install and use.

[0065] In this embodiment, the cross-section of the slot 132 can also be a polygonal structure such as a triangle or quadrilateral. The cross-sectional structure of the drive shaft 122 matches the cross-section of the slot 132, which improves the stability of the connection between the spindle 13 and the drive shaft 122 and avoids wear errors between the spindle 13 and the drive shaft 122.

[0066] In this embodiment, the main shaft 13 has a circular cross-section and a positioning protrusion is provided on the main shaft 13. The positioning protrusion is located in the slot 132. The drive shaft 122 has a positioning groove on its side. The positioning protrusion engages with the positioning groove, which improves the stability of the connection between the main shaft 13 and the rotating motor 12.

[0067] The connection structure of the second sensor in this embodiment is described below:

[0068] Combination Figure 2 and Figure 3 In this embodiment, a first limiting piece 131 is provided on the outer side of the main shaft 13; the electric screwdriver with pressure and torque sensor also includes a second sensor flange 20 and a plane bearing 21. The top end of the inner ring of the second sensor flange 20 is connected to the bottom end of the first sensor body 14, and the outer side of the bottom end of the second sensor is connected to the outer shell 11. The second sensor body 15 is located inside the second sensor flange 20; the plane bearing 21 is sleeved on the outer side of the main shaft 13 and is positioned between the first limiting piece 131 and the second sensor body 15. Through the design of the first limiting piece 131, the second sensor flange 20, and the plane bearing 21, the second sensor body 15 is effectively supported and positioned, improving the accuracy and stability of its data acquisition.

[0069] Combination Figure 4 In this embodiment, the inner ring of the top of the second sensor flange 20 is connected to the bottom of the first sensor body 14, and the outer ring of the top of the second sensor flange 20 is connected to the outer shell 11. Furthermore, the outer ring of the bottom of the first sensor flange 17 has a polygonal cross-section, and the inner ring of the second sensor flange 20 matches the outer ring of the bottom of the first sensor flange 17. That is, the second connecting part 143 has a polygonal structure, and the top of the second sensor flange 20 is provided with a second fixing groove 203 for engaging the second connecting part 143. The structure of the second fixing groove 203 matches the structure of the second connecting part 143. This polygonal design enhances the connection stability between the second sensor flange 20 and the outer shell 11, improving the overall structural strength of the product.

[0070] Furthermore, the electric screwdriver with pressure and torque sensor also includes a second limiting piece 22. The second limiting piece 22 is disposed within the second sensor flange 20 and is located between the first sensor body 14 and the second sensor body 15. The second limiting piece 22 limits the position of the second sensor body 15. The design of the second limiting piece 22 further limits the position of the second sensor body 15, preventing the second sensor body 15 from moving upward and thus squeezing the first sensor body 14, thereby improving the accuracy and stability of its data acquisition.

[0071] Combination Figure 3 and Figure 4 In this embodiment, the electric screwdriver with a torque sensor also includes a deep groove ball bearing 23 and a retaining ring 24. The deep groove ball bearing 23 is sleeved on the spindle 13, with its inner ring connected to the bottom end of the first limiting piece 131 and its outer ring connected to the second sensor flange 20. The retaining ring 24 is disposed inside the second sensor flange 20, located at the bottom end of the outer ring of the deep groove ball bearing 23, and is used to limit the position of the deep groove ball bearing 23. The design of the deep groove ball bearing 23 and the retaining ring 24 improves the connection stability between the spindle 13 and the second sensor flange 20, reduces the shaking and friction of the spindle 13 during rotation, and improves the service life of the electric screwdriver.

[0072] In this embodiment, the electric screwdriver with a torque sensor also includes a mounting plate 25 and an electrostatic brush 26. The mounting plate 25 is connected to the second sensor flange 20. The electrostatic brush 26 is disposed on the mounting plate 25 and is located on the side of the spindle 13. The electrostatic brush 26 is used to eliminate static electricity from the spindle 13. The design of the electrostatic brush 26 can effectively eliminate static electricity generated by the spindle 13 during rotation, avoiding safety hazards and performance degradation caused by static electricity accumulation.

[0073] Furthermore, the mounting plate 25 is connected to the outside of the second sensor flange 20. The second sensor flange 20 is provided with a second receiving groove 201 and a first through hole 202, which communicate with each other. The mounting plate 25 is located inside the second receiving groove 201, and the outer side of the mounting plate 25 matches the outer structure of the second sensor flange 20. The electrostatic brush 26 passes through the first through hole 202 and extends into the second sensor flange 20. The design of the second receiving groove 201 and the first through hole 202 allows the mounting plate 25 and the electrostatic brush 26 to be more securely installed on the second sensor flange 20 without occupying additional space for the electric screwdriver, thus improving the overall structural safety and compactness of the product.

[0074] The structure of the outer shell 11 in this embodiment is described below:

[0075] Combination Figure 1 and Figure 2In this embodiment, the outer casing 11 includes a main casing 111, a front cover 112, and a connector 113. The main casing 111 is a hollow cylindrical structure with an opening at its bottom, and the rotating motor 12 is located inside the main casing 111. The front cover 112 is located below the main casing 111 and is used to close the opening. The second sensor body 15 is connected to the front cover 112. The connector 113 connects the main casing 111 to the front cover 112. The design of the outer casing 11 provides robust protection and support for the electric screwdriver, while facilitating the installation and maintenance of internal components. The design of the main casing 111, the front cover 112, and the connector 113 enables the outer casing 11 to more securely fix the internal components, improving the overall structural strength and durability of the product.

[0076] Working principle of the invention:

[0077] 1. When the user starts the electric screwdriver, the rotating motor 12 starts working, and the rotating part 121 at the bottom of the rotating motor 12 drives the drive shaft 122 to rotate.

[0078] The drive shaft 122 is connected to the main shaft 13 via the slot 132, driving the main shaft 13 to rotate. The bit 16 at the other end of the main shaft 13 rotates accordingly, ready to perform tightening or loosening operations.

[0079] II. Torque and Downforce Monitoring.

[0080] When the bit 16 contacts the screw and applies force, the first sensor body 14 and the second sensor body 15 begin to operate.

[0081] A first strain gauge is provided in the middle of the first sensor body 14. The first sensor body 14 monitors the radial torque data generated by the main shaft 13 during rotation through the first strain gauge.

[0082] The second sensor body 15 is equipped with a second strain gauge, which monitors the force on the main shaft 13 in the vertical direction (downward pressure).

[0083] III. The design of components such as motor flange 123, first sensor flange 17, and anti-collision isolation ring 18 enhances the stability and safety of the electric screwdriver's internal structure.

[0084] The anti-collision isolation ring 18 effectively prevents direct collision between the housing 11 and the first sensor flange 17, protecting the sensor's deformation plane from the influence of horizontal forces.

[0085] Fourth, the setting of the elastic element 19 and the second sensor body 15 enables the electric screwdriver to prevent accidental contact when it is not in use, thereby improving the safety during the use of the electric screwdriver.

[0086] 5. Static electricity elimination.

[0087] The electrostatic brush 26 helps to eliminate static electricity on the spindle 13 and prevent operational problems caused by electrostatic interference.

[0088] This completes the working process of the electric screwdriver with pressure and torque sensor in this preferred embodiment.

[0089] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. An electric screwdriver with a pressure-torque sensor, characterized in that, include: shell; A rotating motor is disposed inside the housing, and a rotating part is provided at the bottom end of the rotating motor, and a drive shaft is provided at the rotating part; A spindle is disposed inside the housing. One end of the spindle is connected to the drive shaft, and the other end is provided with a bit. A first limiting piece is provided on the outside of the spindle. The first sensor body has a hollow cylindrical structure. The first sensor body is sleeved on the outer ring of the main shaft. The top of the first sensor body is connected to the rotating part. The bottom outer side of the first sensor body is connected to the outer shell. A first strain device is provided in the middle of the first sensor body. The first strain device is used to collect radial torque data. The second sensor body is a circular ring structure. The second sensor body is sleeved on the outer ring of the main shaft. The second sensor body is connected to the outer shell and the main shaft. The second sensor is equipped with a second strain device, which is used to collect downward pressure and radial torque data. A motor flange is fitted onto the outer ring of the drive shaft, and the top of the motor flange is connected to the rotating part. A first sensor flange is connected to the motor flange, and the inner ring of the first sensor flange engages with the outer ring of the first sensor body. An anti-collision isolation ring is located between the outer shell and the first sensor flange, and the anti-collision isolation ring is sleeved on the outer ring of the first sensor flange; An elastic element is disposed between the drive shaft and the main shaft, and the elastic element elastically presses the main shaft away from the drive shaft; A second sensor flange, the top of the inner ring of the second sensor flange is connected to the bottom end of the first sensor body, the outer side of the bottom end of the second sensor is connected to the outer casing, and the second sensor body is located inside the second sensor flange; and A planar bearing is sleeved on the outside of the main shaft, and the planar bearing is disposed between the first limiting piece and the second sensor body; The first sensor body includes: The first connecting part is located at the top of the first sensor body and is connected to the first sensor flange. A second connecting part is located at the bottom end of the first sensor body, and the second connecting part is connected to the second sensor flange; and A deformation section is located in the middle of the first sensor body, and the cross-sectional diameter of the deformation section is smaller than the cross-sectional diameters of the first connecting section and the second connecting section. The outer side of the deformation section is connected to the first strain device. The electric screwdriver with a pressure and torque sensor also includes a second limiting piece, which is disposed inside the second sensor flange and located between the first sensor body and the second sensor body, thereby limiting the position of the second sensor body.

2. The electric screwdriver with a torque sensor according to claim 1, characterized in that, The outer ring of the first connecting part has a polygonal cross-sectional structure, and the inner ring of the first sensor flange has a cross-sectional structure that matches the outer ring of the first connecting part.

3. The electric screwdriver with a pressure-torque sensor according to claim 1, characterized in that, Also includes: A deep groove ball bearing is sleeved on the main shaft. The inner ring of the deep groove ball bearing is connected to the bottom end of the first limiting piece, and the outer side of the deep groove ball bearing is connected to the second sensor flange. as well as A retaining ring is disposed inside the second sensor flange. The retaining ring is located at the bottom end of the outer ring of the deep groove ball bearing and is used to define the position of the deep groove ball bearing.

4. The electric screwdriver with a pressure-torque sensor according to claim 1, characterized in that, Also includes: The mounting plate is connected to the flange of the second sensor. as well as An electrostatic brush is disposed on the mounting plate and located on the side of the spindle. The electrostatic brush is used to eliminate static electricity from the spindle.

5. The electric screwdriver with a torque sensor according to claim 1, characterized in that, The outer casing includes: The main housing is a hollow cylindrical structure with an opening at its bottom end, and the rotating motor is located inside the main housing; A front cover, located below the main housing, is used to close the opening; the second sensor body is connected to the front cover; and A connector connects the main housing to the front cover.

Images