Mechanical electronic torsion screwdriver
By combining mechanical slip structure and electronic detection technology in the torque driver, the problem of precise control of the twisting torque and preventing overload is achieved, and the problem of inconvenience in the use of existing torque drivers under a variety of tightening objects and different torque requirements is solved.
Patent Information
- Application Number
- CN202422158984.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-04
AI Technical Summary
When existing torque drivers have a large number of tightening objects or require different twisting torques, it is difficult to accurately control the twisting torque, which can easily lead to tightening overload and inconvenient use.
Design a mechanical and electronic torque driver, combining mechanical slip structure and electronic detection technology, displays torque data in real time through a torque sensor and LCD screen, and achieves precise control of the torque and prevents overload through a torque adjustment knob and torsion spring.
It realizes precise control of the torque of the twist, prevents tightening overload, and is more convenient to use, and is suitable for a variety of tightening objects and different torque requirements.
Smart Images
Figure CN223013035U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a torque screwdriver in fastening tools, in particular to a mechanical and electronic torque screwdriver. Background Art
[0002] A torque screwdriver is a fastening tool that relies on the user's hand strength to control the torque for screwing, so as to tighten screw nuts and other tightening objects. At present, the torque screwdrivers sold and used on the market are mainly divided into mechanical torque screwdrivers and electronic torque screwdrivers. Among them, during the use of a mechanical torque screwdriver, users cannot real-time grasp the specific torque data applied by the hand, so some tightening objects with relatively fine torque requirements cannot meet the use requirements. When an electronic torque screwdriver tightens a tightening object, the torque data of the screwing torque can be displayed on an external liquid crystal display screen in real time through a torque sensor, so as to facilitate the user to accurately grasp the specific screwing torque applied by the current hand. Therefore, it can be applied to tightening objects with relatively fine torque requirements and can be widely used in product assembly and inspection. However, when there are a large number of tightening objects, each time a tightening object is screwed, it is necessary to continuously adjust by observing the torque data on the liquid crystal display screen. Therefore, the more tightening objects there are, the more troublesome it is to use. At the same time, it is difficult to accurately control the screwing torque by hand strength. Even if the torque data on the liquid crystal display screen can be observed for auxiliary screwing, in many cases, an excessive screwing torque will still be applied to the tightening object, resulting in the tightening object not meeting the tightening requirements. In addition, different screwing torques need to be applied to many tightening objects, and these torque data cannot be preset in advance and can only be carried out by combining hand strength with data observation, which also brings great inconvenience to use. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a mechanical and electronic torque screwdriver that integrates a mechanical slip structure and electronic detection technology, so as to ensure the accuracy of the screwing torque, prevent over-tightening, and make it more convenient to use.
[0004] The technical problem of the utility model is realized through the following technical solutions:
[0005] A mechatronic torque screwdriver, comprising a housing, a fastening head at the front of the housing, and a handle at the rear of the housing. A main control circuit board and a torque sensor are provided inside the housing. A liquid crystal display screen and a touch switch for controlling the liquid crystal display screen are provided outside the housing. The torque sensor and the liquid crystal display screen are both electrically connected to the main control circuit board. The fastening head includes a torque conduction seat, a rotating shaft provided at the front of the torque conduction seat, a torque spring sleeved outside the rotating shaft, and a torque adjustment knob threadedly rotatably connected to the front of the housing. The torque conduction seat is connected to the torque sensor. The torque adjustment knob pushes against the torque spring, and the torque spring elastically and adjustably positions and contacts the rear end of the rotating shaft inside the torque conduction seat, thereby forming an elastic contact friction force between the rear end of the rotating shaft and the torque conduction seat. The rotating shaft drives the tightening object to rotate and tighten, and the rotating shaft synchronously bears the twisting torque of the tightening object. When the twisting torque is less than the elastic contact friction force, the housing drives the rotating shaft through the torque conduction seat to drive the tightening object to rotate freely. Then, the twisting torque generated during the rotation and tightening process is synchronously conducted to the torque sensor through the torque conduction seat and is displayed on the liquid crystal display screen in real time. When the twisting torque is greater than the elastic contact friction force, the rotation of the rotating shaft is restricted by the tightening object, and the housing drives the torque conduction seat to form a slipping rotation relative to the rear end of the rotating shaft. Then, the twisting torque generated by the slipping rotation is synchronously conducted to the torque sensor through the torque conduction seat and is displayed on the liquid crystal display screen in real time.
[0006] The rear end of the torque conduction seat is coaxially connected to the front end of the torque sensor, and the front end of the torque conduction seat is provided with a coaxially arranged mounting groove.
[0007] The rotating shaft is composed of a front shaft section, a middle shaft section, and a rear shaft section. The front end of the front shaft section is provided with a coaxially arranged tool insertion hole. The shaft diameter of the middle shaft section is larger than that of the rear shaft section, and a limiting shoulder is formed between the middle shaft section and the rear shaft section. A rotating piece is coaxially sleeved and fixed on the rear shaft section, and a pressing piece is coaxially and movably sleeved on the rear shaft section, and the pressing piece is located between the rotating piece and the limiting shoulder.
[0008] Both the rotating piece and the pressing piece are coaxially fitted in the mounting groove, and a groove and a ball are respectively provided between the rotating piece and the mounting groove. The ball is fitted in the groove. The housing drives the rotating shaft through the torque conduction seat to drive the tightening object to rotate freely. When the ball disengages from the groove, the housing drives the torque conduction seat to form a slipping rotation relative to the rear end of the rotating shaft.
[0009] The front end of the torque spring pushes against the inner shoulder at the front of the torque adjustment knob, and the rear end of the torque spring pushes against the pressing piece and pushes the pressing piece to smoothly contact the rotating piece. The pressing piece rotates freely relative to the rotating piece.
[0010] The bottom of the installation groove is provided with a positioning groove arranged coaxially. The pressing piece and the rotating piece are both coaxially assembled in the installation groove, and the rear end of the rear section shaft is positioned and assembled in the positioning groove.
[0011] The torque adjustment knob is threadedly rotatably connected to the front part of the housing, and the torque conduction seat, the rotating shaft and the torque spring are all sleeved therein. The torque adjustment knob is screwed relative to the front part of the housing to increase the elastic contact friction force, or the torque adjustment knob is screwed out relative to the front part of the housing to reduce the elastic contact friction force.
[0012] The front part of the housing is provided with a threaded shaft for the torque adjustment knob to be threadedly rotatably connected. The outer circumferential surface of the threaded shaft is provided with a locking groove, and a set screw is correspondingly provided on the torque adjustment knob. The set screw enters the locking groove, and the torque adjustment knob cannot rotate relative to the threaded shaft. When the set screw disengages from the locking groove, the torque adjustment knob can rotate freely relative to the threaded shaft.
[0013] The locking groove is a straight groove extending axially on the outer circumferential surface of the threaded shaft, and the front end of the locking groove penetrates through the front end of the threaded shaft.
[0014] An internal snap ring is provided on the inner circumferential surface of the notch of the installation groove. The rotating piece and the pressing piece are both coaxially assembled in the installation groove, and the internal snap ring forms a fitting anti-detachment. An external snap ring is provided on the outer circumferential surface of the front end of the middle section shaft. The torque adjustment knob is screwed out relative to the front part of the housing, and the external snap ring limits the screwing-out stroke.
[0015] Compared with the prior art, the utility model mainly has a main control circuit board and a torque sensor disposed inside the housing of a mechanical and electronic torque screwdriver, and a liquid crystal display screen and a touch switch for controlling the liquid crystal display screen disposed outside the housing. The torque sensor and the liquid crystal display screen are both electrically connected to the main control circuit board. The fastening head of the mechanical and electronic torque screwdriver includes a torque conduction seat, a rotating shaft disposed at the front of the torque conduction seat, a torque spring sleeved outside the rotating shaft, and a torque adjustment knob threadedly rotatably connected to the front of the housing. The torque conduction seat is connected to the torque sensor. The torque adjustment knob pushes against the torque spring, and the torque spring elastically and adjustably positions and contacts the rear end of the rotating shaft inside the torque conduction seat, thereby forming an elastic contact friction force between the rear end of the rotating shaft and the torque conduction seat. When the rotating shaft drives the tightening object to rotate and tighten, the rotating shaft synchronously bears the screwing torque of the tightening object. Thus, if the screwing torque is less than the elastic contact friction force, the housing drives the rotating shaft through the torque conduction seat to drive the tightening object to rotate freely, and the screwing torque generated during the rotation and tightening process by the rotating shaft will be synchronously conducted to the torque sensor through the torque conduction seat and displayed on the liquid crystal display screen in real time. If the screwing torque is greater than the elastic contact friction force, the rotation of the rotating shaft is restricted by the tightening object, and the housing will drive the torque conduction seat to form a slipping rotation relative to the rear end of the rotating shaft, and then the screwing torque generated by the slipping rotation will be synchronously conducted to the torque sensor through the torque conduction seat and displayed on the liquid crystal display screen in real time. Obviously, since the mechanical and electronic torque screwdriver integrates a mechanical slipping structure and an electronic detection technology into one, it can not only ensure the accuracy of the screwing torque through the electronic structure, but also prevent over-tightening on the tightening object through the mechanical slipping structure, and can also set the screwing torque, that is, once the screwing torque reaches the set value, it can be released through the mechanical slipping structure, so that when there are a large number of tightening objects or different screwing torques need to be applied to many tightening objects, the tightening objects can meet the tightening requirements by setting the screwing torque, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic cross-sectional structure diagram of the utility model.
[0017] Figure 2 is Figure 1 the top view of
[0018] Figure 3 is Figure 1 the three-dimensional exploded view of
[0019] Figure 4 is the structural schematic diagram of the torque conduction seat.
[0020] Figure 5 is Figure 4 the top view of DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] The embodiments of the present utility model will be further described in detail with reference to the above-mentioned drawings.
[0022] As Figures 1 to 5 shown, 1. housing, 11. main control circuit board, 12. torque sensor, 121. jack, 13. liquid crystal display screen, 14. touch switch, 15. threaded shaft, 151. locking groove, 2. fastening head, 21. torque conduction seat, 211. connecting shaft, 212. mounting groove, 213. inner ring groove, 214. groove, 215. positioning groove, 22. rotating shaft, 221. front shaft segment, 222. middle shaft segment, 223. rear shaft segment, 224. tool insertion hole, 225. limiting outer shoulder, 226. outer ring groove, 23. rotating piece, 231. connecting sleeve, 232. round bead, 233. steel ball hole, 24. pressing piece, 241. movable sleeve, 25. torque spring, 26. compression spring sleeve, 27. locking steel ball, 28. torque adjustment knob, 281. inner shoulder, 3. handle, 4. pin, 5. set screw, 6. inner circlip, 7. outer circlip.
[0023] A mechanical and electronic torque screwdriver, as Figures 1 to 3 shown, mainly relates to a digital display torque fastening tool for tightening and inspecting tightening objects such as screws and nuts. In this embodiment, the upper part of the view shown in Figure 1 and Figure 2 is taken as the front part of the mechanical and electronic torque screwdriver, and the lower part of the view is taken as the rear part of the mechanical and electronic torque screwdriver. Its structure includes a housing 1, a fastening head 2 installed at the front of the housing, and a handle 3 installed at the rear of the housing.
[0024] The housing 1 is provided with a main control circuit board 11 and a torque sensor 12 inside, and also a rechargeable battery and a buzzer. Outside the housing 1, there are a liquid crystal display screen 13 and a touch switch 14 for controlling the liquid crystal display screen. The liquid crystal display screen 13 can display the collected torque data and set display content, etc. Through the touch switch 14, the opening and closing of the liquid crystal display screen 13 can be controlled, as well as the confirmation or switching of various function items displayed on the liquid crystal display screen; the torque sensor 12 and the liquid crystal display screen 13 are both electrically connected to the main control circuit board 11.
[0025] The main control circuit board 11 is provided with a CPU processor, a storage module, a WIFI module, a battery management module, a USB module, an LED lamp, a battery charging interface, etc.
[0026] Among them, the storage module is electrically connected to the CPU processor and is mainly used for storing data; the WIFI module can perform wireless data transmission with a connected PC; the battery management module can manage the charging and discharging process of the rechargeable battery, protect the rechargeable battery and extend its service life; the USB module can be connected to a PC through a data cable and transmit data; the LED light can warn and prompt the reachable torque peak value; the battery charging interface can be used to charge the rechargeable battery with a charger.
[0027] The fastening head 2 includes a torque conduction seat 21, a rotating shaft 22 provided at the front of the torque conduction seat, a torque spring 15 sleeved outside the rotating shaft, and a torque adjustment knob 28 threadedly rotatably connected to the front of the housing 1.
[0028] The rear end of the torque conduction seat 21 is coaxially connected to the front end of the torque sensor 12. Specifically, as Figure 1 shown, the connecting shaft 211 at the rear end of the torque conduction seat 21 is coaxially inserted into the jack 121 at the front end of the torque sensor 12, and then the two are connected and fastened by a pin 4. Therefore, the torque sensor 12 can sense the rotational force borne on the torque conduction seat 21 and generate deformation. The magnitude of this deformation amount exactly corresponds to the screwing torque borne on the torque conduction seat 21. Then, the torque data of this screwing torque is transmitted to the main control circuit board 11 through the torque sensor 12, and the main control circuit board can display the torque data on the liquid crystal display screen 13 in real time.
[0029] The front end of the torque conduction seat 21 is provided with a coaxially arranged mounting groove 212. The mounting groove is a circular groove, and a circular inner groove 213 is provided on the inner circumferential surface of the groove opening of the mounting groove.
[0030] The rotating shaft 22 is composed of a front shaft section 221, a middle shaft section 222, and a rear shaft section 223. These three shaft sections are integrally manufactured and on the same axis. When the rotating shaft 22 drives the tightening object to rotate and tighten, the rotating shaft 22 synchronously bears the screwing torque of the tightening object.
[0031] The front end of the front shaft section 221 is provided with a coaxially arranged tool insertion hole 224, generally selected as an internal hexagonal hole. Various detachable mating tightening tools, such as a flat screwdriver head or a cross screwdriver head, etc., can be provided in the tool insertion hole 224, and the tightening object is driven to rotate and tighten through various tightening tools; moreover, the insertion of the tightening tool is also carried out by pressing the locking steel ball 27 in cooperation with the compression spring sleeve 26 sleeved on the front end of the front shaft section 221 into the tool insertion hole 224 to clamp the tightening tool, thereby preventing the tightening tool from falling out of the tool insertion hole 224 and making the tightening tool and the rotating shaft 22 on the same axis.
[0032] The shaft diameter of the middle section shaft 222 is larger than that of the rear section shaft 223. Therefore, a circumferential limiting shoulder 225 can be formed between the middle section shaft and the rear section shaft. An outer circumferential groove 226 is provided on the front outer circumferential surface of the middle section shaft 222.
[0033] A rotating piece 23 and a pressing piece 24 are coaxially sleeved on the rear section shaft 223. The rotating piece 23 and the pressing piece 24 are circular plates with the same diameter. A connecting sleeve 231 extending coaxially is provided on the front side of the rotating piece 23. The connecting sleeve is fixed on the rear section shaft 223 by a pin 4. The pressing piece 24 is located between the rotating piece 23 and the limiting shoulder 225. A movable sleeve 241 extending coaxially is provided on the front side of the pressing piece 24. Both the pressing piece 24 and the movable sleeve 241 are movably sleeved relative to the rear section shaft 223. Usually, the pressing piece 24 and the movable sleeve 241 need to be movably sleeved outside the connecting sleeve 231. Therefore, the pressing piece 24 can rotate freely and move axially back and forth relative to the rear section shaft 223, but its axial reciprocating movement stroke is limited between the rotating piece 23 and the limiting shoulder 225.
[0034] The rotating piece 23 and the pressing piece 24 are both coaxially assembled in the installation groove 212. Grooves 214 and balls 232 are respectively provided between the rotating piece 23 and the installation groove 212. In this embodiment, Figure 5 As shown, six grooves 214 centered on the axis and evenly distributed in a circumferential manner are provided at the bottom of the installation groove 212. Each groove is semi-circular. Correspondingly, three balls 232 centered on the axis and evenly distributed in a circumferential manner are provided on the rotating piece 23. Each ball is a steel ball and is embedded and fixed in the ball hole 233. In this way, once the rotating piece 23 is coaxially assembled in the installation groove 242, the three balls 232 on the rotating piece 23 are exactly correspondingly assembled in three of the six grooves 214.
[0035] At the same time, a positioning groove 215 is coaxially provided at the bottom of the installation groove 212. Therefore, when both the pressing piece 24 and the rotating piece 23 are coaxially assembled in the installation groove 212, in addition to the assembly of the balls 232 and the grooves 214, the rear end of the rear section shaft 223 is also simultaneously positioned and assembled in the positioning groove 245. The purpose is to ensure that when the torque transmission seat 21 drives the rotating shaft 22 to rotate through the assembled balls 232 and grooves 214, it is exactly on the same rotation axis, that is, to ensure the concentricity of the torque transmission seat 21 and the rotating shaft 22 during synchronous rotation.
[0036] A threaded shaft 15 is provided at the front of the housing 1. The rear part of the torque adjustment knob 28 is threadedly connected to the threaded shaft 15 at the front of the housing 1 through an internal threaded hole in a threaded rotation manner, and the torque conduction seat 21, the rotating shaft 22, and the torque spring 25 are all sleeved inside. At this time, the front end of the torque spring 25 abuts against the inner shoulder 281 at the front of the torque adjustment knob 28, and the rear end of the torque spring 25 abuts against the pressing piece 24 and pushes the pressing piece to smoothly contact the rotating piece 23 to form relative free rotation. That is, the torque adjustment knob 28 pushes the torque spring 25, and the torque spring pushes the pressing piece 24 to drive the rotating piece 23 at the rear end of the rotating shaft 22 to be elastically and adjustably positioned and contact in the installation groove 212 of the torque conduction seat 21. At this time, an elastic contact friction force can be formed between the rotating piece 23 and the torque conduction seat 21.
[0037] In actual work, when the ball 232 is fitted in the groove 214 and will not come off, an elastic contact friction force is formed; moreover, when the torque adjustment knob 28 is screwed into the threaded shaft 15 at the front of the housing 1, the elastic contact friction force can be correspondingly increased, so that a larger screwing torque can be applied to the tightened object; when the torque adjustment knob 28 is screwed out of the threaded shaft 15 at the front of the housing, the elastic contact friction force can be correspondingly reduced, so that a smaller screwing torque is applied to the tightened object.
[0038] A locking groove 151 is provided on the outer circumferential surface of the threaded shaft 15. Correspondingly, a set screw 5 is provided on the torque adjustment knob 28. In this embodiment, two locking grooves 151 are provided in total. One locking groove is in the same plane as the liquid crystal display screen 13, and the other locking groove is in a relative position. Each locking groove 151 is a straight groove extending axially on the outer circumferential surface of the threaded shaft 15, and the front end of each locking groove 151 penetrates from the front end of the threaded shaft 15.
[0039] Therefore, when the set screw 5 enters any one of the locking grooves 151, the torque adjustment knob 28 cannot rotate relative to the threaded shaft 15, that is, the current position of the torque adjustment knob 28 is locked to set the elastic contact friction force; when the set screw 5 disengages from the locking groove 151, the torque adjustment knob 28 can rotate freely relative to the threaded shaft 15, that is, the elastic contact friction force is adjusted by the free rotation of the torque adjustment knob 28.
[0040] Moreover, scale marks can also be set in the locking groove 151 that is in the same plane as the liquid crystal display screen 13 to assist the torque adjustment knob 28 to accurately adjust or set the elastic contact friction force.
[0041] In addition, an internal circlip 6 is provided in the inner annular groove 213 of the installation groove 212. When the rotating piece 23 and the pressing piece 24 are both coaxially assembled in the installation groove 212, the internal circlip 6 can form an anti-disassembly for the assembly. An external circlip 7 is provided in the outer annular groove 226 at the front end of the middle section shaft 222. When the torque adjustment knob 28 is screwed out relative to the threaded shaft 15 at the front part of the housing 1, the external circlip 7 can limit the screwing travel of the torque adjustment knob 28.
[0042] The working process of this mechanical and electronic torque screwdriver is as follows:
[0043] If the screwing torque is less than the elastic contact friction force, the ball 232 will be assembled in the groove 214 and will not come out. The housing 1 drives the rotating shaft 22 through the torque conduction seat 21 to drive the tightening object to rotate freely. Then, the screwing torque generated during the rotating tightening process is synchronously conducted to the torque sensor 12 through the torque conduction seat 21 and is displayed on the liquid crystal display screen 13 in real time in the form of torque data.
[0044] When the screwing torque is greater than the elastic contact friction force, the rotating shaft 22 will be restricted from rotating by the tightening object. At this time, the housing 1 drives the torque conduction seat 21 to form a slipping rotation relative to the rear end of the rotating shaft 22, that is, the ball 232 will come out of the groove 214, so that the housing 1 drives the torque conduction seat 21 to form a slipping rotation relative to the rear end of the rotating shaft 22. Then, the screwing torque generated by this slipping rotation is synchronously conducted to the torque sensor 12 through the torque conduction seat 21 and is displayed on the liquid crystal display screen 13 in real time in the form of torque data. At this time, this torque data is the torque peak value of the screwing torque.
[0045] Of course, in this embodiment, three balls 232 are assembled in three of the six grooves 214. Therefore, when the three balls 232 are continuously entering new three grooves from the initial three grooves during the slipping rotation, due to the existence of the height difference, a clicking slipping prompt sound will be continuously emitted. Combined with the LED lamp on the main control circuit board 11, it can visually warn and prompt the user that this mechanical and electronic torque screwdriver has reached the torque peak value.
[0046] When the housing 1 drives the torque conduction seat 21 to form a slipping rotation relative to the rear end of the rotating shaft 22, the torque adjustment knob 28 will drive the pressing piece 24 to rotate freely relative to the rotating piece 23 through the torque spring 25. Therefore, the pressing piece needs to be made of wear-resistant, smooth and high-strength materials. Its function is to evenly distribute the pushing elastic force of the torque spring 25 on the rotating piece 23 through the pressing piece 24, so that the rotating piece can form an even rotation, and at the same time prevent the torque spring 25 from directly scratching the rotating piece 23 due to the rotation drive of the torque adjustment knob 28.
[0047] The utility model is a mechanical and electronic torque screwdriver integrating a mechanical slipping structure and electronic detection technology. Therefore, it can not only ensure the accuracy of the screwing torque through the electronic structure, but also prevent over-tightening on the tightened object through the mechanical slipping structure. Moreover, it can set the screwing torque, that is, once the screwing torque reaches the set value, it can be released through the mechanical slipping structure. This enables the number of tightened objects to be large or different screwing torques to be applied to many tightened objects, and all can meet the tightening requirements by setting the screwing torque, making it more convenient to use.
[0048] The above are only specific embodiments of the utility model. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included within the protection scope of the utility model.
Claims
1. A mechanical electronic torque screwdriver, comprising a housing (1), a fastening head (2) at the front of the housing, and a handle (3) at the rear of the housing, characterized in that: The housing (1) is provided with a main control circuit board (11) and a torque sensor (12), and the housing is provided with a liquid crystal display screen (13) and a touch switch (14) for controlling the liquid crystal display screen (13). The torque sensor (12) and the liquid crystal display screen (13) are both connected to the main control circuit board (11) by circuits. The fastening head (2) comprises a torque transmission seat (21), a rotating shaft (22) arranged at the front of the torque transmission seat, a torsion spring (25) sleeved outside the rotating shaft, and a torque adjustment knob (28) threadedly connected to the front of the housing (1); the torque transmission seat (21) is connected to the torque sensor (12); the torque adjustment knob (28) pushes the torsion spring (25), and the torsion spring elastically and adjustably positions the rear end of the rotating shaft (22) in contact with the torque transmission seat (21), thereby forming an elastic contact friction force between the rear end of the rotating shaft (22) and the torque transmission seat (21); The rotating shaft (22) drives the tightening object to form a rotational tightening, and the rotating shaft (22) simultaneously bears the tightening torque of the tightening object; The twisting torque is smaller than the elastic contact friction force, and the housing (1) drives the rotating shaft (22) via the torque transmission seat (21) to drive the tightening object to rotate freely, and then the rotating shaft (22) transmits the twisting torque generated during the rotation and tightening process to the torque sensor (12) through the torque transmission seat (21) and displays it in real time on the liquid crystal display (13); The twisting torque is greater than the elastic contact friction force, the rotating shaft (22) is restricted from rotating by the tightened object, and the housing (1) drives the torque transmission seat (21) to form a slipping rotation relative to the rear end of the rotating shaft (22), and the twisting torque generated by the slipping rotation is synchronously transmitted to the torque sensor (12) through the torque transmission seat (21) and displayed in real time on the liquid crystal display (13).
2. A mechanical electronic torque screwdriver according to claim 1, characterized in that The rear end of the torque transmission seat (21) is coaxially connected to the front end of the torque sensor (12), and the front end of the torque transmission seat (21) is provided with a coaxially arranged mounting groove (212).
3. A mechanical electronic torque screwdriver according to claim 2, characterized in that The rotating shaft (22) is composed of a front shaft (221), a middle shaft (222) and a rear shaft (223); a tool insertion hole (224) is coaxially arranged at the front end of the front shaft (221); the shaft diameter of the middle shaft (222) is larger than that of the rear shaft (223); a limiting outer shoulder (225) is formed between the middle shaft (222) and the rear shaft (223); a rotating plate (23) fixedly mounted coaxially and a pressing plate (24) movably mounted coaxially are provided on the rear shaft (223); and the pressing plate is located between the rotating plate (23) and the limiting outer shoulder (225).
4. A mechanical electronic torque screwdriver according to claim 3, characterized in that The rotating piece (23) and the pressing piece (24) are coaxially mounted in the mounting groove (212), and a groove (214) and a round ball (232) are respectively provided between the rotating piece (23) and the mounting groove (212); the round ball (232) is mounted in the groove (214), and the housing (1) drives the rotating shaft (22) via the torque transmission seat (21) to drive the tightening object to rotate freely; when the round ball (232) escapes from the groove (214), the housing (1) drives the torque transmission seat (21) to form a slipping rotation relative to the rear end of the rotating shaft (22).
5. A mechanical electronic torque screwdriver according to claim 4, characterized in that The front end of the torsion spring (25) pushes against the inner shoulder (281) at the front of the torsion adjustment knob (28), and the rear end of the torsion spring (25) pushes against the pressing plate (24), and pushes the pressing plate to smoothly contact the rotating plate (23), and the pressing plate (24) rotates freely relative to the rotating plate (23).
6. A mechanical electronic torque screwdriver according to claim 4, characterized in that The bottom of the installation groove (212) is provided with a coaxially arranged positioning groove (215), the pressing plate (24) and the rotating plate (23) are coaxially mounted in the installation groove (212), and the rear end of the rear shaft (223) is positioned and mounted in the positioning groove (215).
7. A mechanical electronic torque screwdriver according to claim 1, characterized in that The torque adjustment knob (28) is threadedly connected to the front of the housing (1), and the torque transmission seat (21), the rotating shaft (22) and the torsion spring (25) are all mounted therein. The torque adjustment knob (28) is screwed relative to the front thread of the housing (1) to increase the elastic contact friction force, or the torque adjustment knob (28) is screwed out relative to the front thread of the housing (1) to reduce the elastic contact friction force.
8. A mechanical electronic torque screwdriver according to claim 1, characterized in that The front part of the housing (1) is provided with a threaded shaft (15) for threaded rotation connection with the torque adjustment knob (28), the outer circumferential surface of the threaded shaft is provided with a locking groove (151), and a set screw (5) is correspondingly provided on the torque adjustment knob (28); when the set screw enters the locking groove (151), the torque adjustment knob (28) cannot rotate relative to the threaded shaft (15), and when the set screw (5) is out of the locking groove (151), the torque adjustment knob (28) can rotate freely relative to the threaded shaft (15).
9. A mechanical electronic torque screwdriver according to claim 8, characterized in that The locking groove (151) is a straight groove extending along the axial direction and arranged on the outer circumferential surface of the threaded shaft (15), and the front end of the locking groove (151) passes through the front end of the threaded shaft (15).
10. A mechanical electronic torque screwdriver according to claim 4, characterized in that An inner retaining spring (6) is provided on the inner circumferential surface of the groove opening of the installation groove (212); the rotating plate (23) and the pressing plate (24) are coaxially mounted in the installation groove (212), and the inner retaining spring (6) forms a mounting stop; an outer retaining spring (7) is provided on the outer circumferential surface of the front end of the middle shaft (222); the torque adjustment knob (28) is screwed out relative to the front thread of the housing (1), and the screwing-out stroke is limited by the outer retaining spring (7).