CN211992707U

CN211992707U - Multifunctional precise numerical control electric screwdriver

Info

Publication number: CN211992707U
Application number: CN202020543470.3U
Authority: CN
Inventors: 胡微; 潘明
Original assignee: Individual
Current assignee: Guangdong Xiyu Technology Co.,Ltd.
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-11-24
Anticipated expiration: 2030-04-14

Abstract

The utility model belongs to the technical field of the screw tightening instrument, concretely relates to electronic screwdriver of multi-functional accurate numerical control, including casing, energy memory, controlling means, detection device, drive arrangement and output shaft subassembly, energy memory, controlling means, detection device, drive arrangement, output shaft subassembly are all blocked and are arranged in inside the casing, and drive arrangement's both ends are respectively through the inside joint of first bearing, second bearing and casing, and the output shaft subassembly is connected with drive arrangement's output, and detection device is connected with drive arrangement's surface. This screwdriver can dynamic monitoring screwdriver's moment of torsion, and it is high to detect the precision to carry out dynamic adjustment to screwdriver's work, avoid the moment of torsion transfinite, increase its job stabilization nature, prolong its life. The electric screwdriver can also be used as a digital display torque manual screwdriver or a portable torque detector.

Description

Multifunctional precise numerical control electric screwdriver

Technical Field

The utility model belongs to the technical field of the screw tightening instrument, concretely relates to electronic screwdriver of multi-functional accurate numerical control.

Background

With the rapid development of industries such as automobiles, aerospace, machinery, electronic products, mobile phones and the like in China, the assembly requirements on various compact mechanical parts are higher and higher, and a screwdriver is an important tool for screwing screws and is widely used in various assembly processes, so that the improvement of the automation degree of the screwing tool becomes urgent. Meanwhile, when the screw driver is automatically controlled, the torque control precision and the intelligent requirement of the screw driver are correspondingly improved. In addition, torque rechecking needs to be carried out on some screwed screws in field work, or torque verification needs to be carried out during disassembly, so that the requirement on the portable torque detector is met.

The control of the output torque by the electric tools on the market at present is classified into the following types:

1. mechanical trigger type: the mode adopts a classical spring type pre-adjusting clutch, the clutch begins to slip when reaching the required torque or stops through a mechanical mechanism trigger circuit, the principle is simple, and the application is wide. However, in the case of the slipping structure, when the torque value reaches, the slipping structure repeatedly enters the engaged/disengaged state, and the impact is output continuously, and the torque value actually increases continuously. The mechanical trigger circuit is not repeatedly switched into a separation and combination state, but is still not sensitive and accurate enough. Compared with the latter modes, the defects of relatively complex device, limited adjusting range, low control precision, incapability of realizing small torque, poor stability, large volume, high noise, abrasion and the like still exist, for example, patents CN203438139U, CN203449227U and CN 201295892Y.

2. Motor load current detection formula: the current rotation resistance moment, namely the output torque, is indirectly judged by detecting the change of the load current of the motor loop (the motor which normally runs is subjected to resistance, the load current can be increased, and a certain linear relation exists). The method does not need to add mechanical parts and is low in cost, but in a small-torque application scene, particularly when screws are repeatedly screwed or disassembled, the current change caused by real loads is covered due to the fact that the starting current of the motor is usually very large, and therefore the control accuracy is not high. In addition, the wear of the transmission mechanism also changes the load current of the motor, so that the load current cannot be used as an accurate reference. Such as the relevant patents and documents CN208084248U, CN103264370B, CN 105269508A.

3. The inertia braking mode is that the required torque is obtained when the screw stops within the statistically relatively stable free deceleration time by controlling the magnitude of the rotational inertia. In this way, mechanical parts are not required to be added, but the precise screwing, especially the control of small torque, cannot be realized due to the influence of friction conditions, material characteristics and rotation speed control precision. For example patent CN 101466501B.

4. Direct torque measurement: the corresponding torque is obtained by directly measuring the elastic deformation of the elastomer. Compared with all the above modes, the mode has higher requirements on the precision of the test element and the precision of the circuit, and theoretically, the measurement is more accurate. For example, patent CN208528492U, even with the addition of an angle measuring device to accurately control the number of turns, this structure is relatively large and inconvenient for hand-held and micro-automation production lines. CN202331115U, CN206344072U, CN110370212A and CN106078597A describe similar basic principles, have no specific data and specific embodiments for reference, and require creative labor to implement. Patent CN 103934673B's scheme is concrete relatively but this scheme has the degree of difficulty to the measurement of small moment of torsion, and measuring precision is low, and overall equipment structure is complicated, and is bulky, heavy, portable not convenient for, and the marketing popularization of not being convenient for is specifically contrasted in the utility model content of this application and is described.

In conclusion, the related art has defects and needs to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the multifunctional precise numerical control electric screwdriver is not enough in the prior art, can dynamically monitor the torque of the screwdriver, is high in detection precision, dynamically adjusts the work of the screwdriver, avoids torque overrun, improves the stability of the work, prolongs the service life of the screwdriver, and can be used as a digital display torque manual screwdriver or a portable torque detector.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a multifunctional precise numerical control electric screwdriver comprises a shell, an energy storage device, a control device, a detection device, a driving device and an output shaft assembly, wherein the energy storage device, the control device, the detection device, the driving device and the output shaft assembly are all clamped inside the shell, two ends of the driving device are respectively clamped and connected with the inside of the shell through a first bearing and a second bearing, the output shaft assembly is connected with an output end of the driving device, the detection device is connected with the surface of the driving device and comprises a first clamping block, a second clamping block, an elastic body and an inductor, the inductor is arranged on the elastic body, the first clamping block and the second clamping block are respectively connected with two ends of the elastic body, the first clamping block is clamped and connected with the surface of the driving device, and the second clamping block is clamped and arranged on the inner wall of the shell, the energy storage device, the inductor and the driving device are all electrically connected with the control device. In practical application, the detection device is preferentially arranged at the rear end of the driving device, based on the structural design, the detection device does not need to be designed into a coaxial hollow body for avoiding an output shaft assembly but can be conveniently reduced, an elastic body in the detection device can be designed into a long and narrow flat sheet in a torsion central axis, and the torsion rigidity of the flat elastic body is obviously smaller than that of a cylindrical elastic body according to the knowledge related to the torsion rigidity of material mechanics, so that a strain gauge adhered to the surface of the flat elastic body can obtain larger deformation, more obvious differential signals are output, and more accurate torque measurement is realized; meanwhile, the test shows that: the width of 10.0 mm, the thickness of 2.0 mm, heat treatment hardness HRC40 degree spring steel sheet, two side each paste a Hualan sea BF1000-3HA-E half bridge strain gauge (a kind in the inductor), when the bridge voltage is 2.5V, under the torque effect of 400Ncm, the differential signal output amplitude is 10.6 mV. The same strain gauge is attached to a preposed torque detection unit with a size suitable for the size shown in the patent CN103934673B, for example, the outer diameter is 14.0 mm, the outer side of a steel pipe with the wall thickness of 0.5 mm, the same torque only generates a differential signal of 1.1mV (which is easily interfered by environmental signals), and the result is consistent with the torsional rigidity theory, so the detection precision of the technical scheme in the application is higher; meanwhile, the supporting structure of the driving device in the application is different from the cantilever support of the patent CN103934673B, the whole driving device is supported by double bearings and reliably and radially clamped in the shell, so that the measurement error caused by the knocking and rough contact of the driving device on the shell in an impact working environment is prevented, meanwhile, the torque can fully act on the elastic body, and the measurement precision is improved; the first bearing and the second bearing are preferably deep groove ball bearings, and the structure design enables the driving device to be clamped in the shell in a circumferential rotatable and axial slidable mode; the first fixture block and the second fixture block are provided with holes or grooves for respectively routing a motor cable or an inductor connecting wire, so that interference is reduced; the control device has the program functions of disassembling or screwing according to a target torque value, monitoring the number of turns, locking a motor, displaying torque, monitoring current, monitoring temperature, controlling charging, recording working condition data and the like, and is also provided with an LED, a buzzer, a vibrator and the like, wherein the LED is used for outputting working illumination and visual feedback of a shaft assembly, the buzzer can provide auditory feedback in use, and the vibrator can provide tactile feedback in use; in the working process, the output shaft assembly is matched with a screw to be screwed; then the control device controls the driving device to start working; the output end of the driving device rotates to drive the output shaft assembly to rotate; when the output shaft assembly drives the screw to rotate, the output shaft assembly receives reaction resistance from the screw, and the reaction resistance is transmitted to the driving device through the output shaft assembly; the driving device is in turnover along the first bearing and the second bearing under the action of the reaction resistance; the first clamping block clamped with the surface of the driving device is driven to synchronously rotate; the elastic body connected with the first clamping block is driven by the first clamping block to be twisted; the sensor arranged on the elastic body monitors the torsion amount of the elastic body in real time and transmits the monitored information to the control device in real time; the control device processes the information and regulates and controls the working state of the driving device in real time according to the processed result, so that torque overrun is avoided, and the screwdriver is more stable in working; meanwhile, the control device processes the information to obtain real-time output torque, and the output torque is displayed on the display screen in real time, so that the working state of the screwdriver can be monitored in real time; the screwdriver can dynamically monitor the torque of the screwdriver and dynamically adjust the work of the screwdriver, so that the torque is prevented from exceeding the limit; meanwhile, the precision measurement of the small torque is realized, the detection precision is high, the structure is simple, the carrying is convenient, the working stability is high, and the service life is long. The electric screwdriver can be used as a manual screwdriver with a torque display function or a portable torque detector by locking a transmission chain of a speed reduction system in a mechanical or electromechanical mode such as a brake motor.

As an improvement of electronic screwdriver of multi-functional accurate numerical control, the inductor is foil gage, grating chi, magnetic grid chi, high sensitivity inductance type displacement probe, high sensitivity capacitanc displacement probe or high sensitivity piezoelectric patches. The inductor is preferably a strain gauge in the present application; in practical application, a half-bridge strain gauge is respectively adhered to the front surface and the back surface of the elastic body, and the strain gauges are electrically connected with the control device; in operation, the amplitude optimal value of the differential signal generated by the strain gauge is between plus or minus 5mV and plus or minus 15mV, so that the differential signal has a relatively high signal-to-noise ratio, and a certain safety margin is reserved for processing practical situations such as overload.

As an improvement of the multifunctional precise numerical control electric screwdriver, the energy storage device is a nickel-cadmium battery, a nickel-hydrogen battery or a lithium ion battery. Besides, the energy storage device can be other batteries capable of achieving the same effect, and can be flexibly arranged according to actual conditions.

As an improvement of the multi-functional accurate numerical control electric screwdriver, controlling means is singlechip or PLC. Besides, the control device can be other devices which can achieve the same effect, and can be flexibly set according to actual conditions.

As an improvement of electronic screwdriver of multi-functional accurate numerical control, controlling means is provided with display screen and switch, the display screen the switch all runs through the casing, the display screen the switch all with the controlling means electricity is connected. The switch is used for controlling the working state of the screwdriver, the display screen is used for displaying the working state and relevant parameters of the screwdriver, and the structural design facilitates real-time monitoring of the working of the screwdriver.

As an improvement of the multifunctional precise numerical control electric screwdriver, the switch is a key switch or a photoelectric switch. The photoelectric switch is preferably selected to be electrically connected with the control device, and the structural design is favorable for avoiding contact oxidation and improving the sensitivity.

As an improvement of multi-functional accurate numerical control electric screwdriver, drive arrangement includes motor and reduction gear, the output shaft subassembly passes through the reduction gear with the output of motor is connected. The motor is preferably a brushless motor with a brake, the speed reducer is preferably a planetary speed reducer, and the structural design can increase the stability of work.

As an improvement of the multifunctional precise numerical control electric screwdriver, the rear end of the shell is provided with a plug or a socket. The structure design is beneficial to charging the screwdriver or carrying out communication control on the screwdriver.

As an improvement of multi-functional accurate numerical control electric screwdriver, the one end of output shaft subassembly is provided with criticizes the head. The structural design is beneficial to screwing the screw.

Compared with the prior art, the beneficial effects of the utility model are that: as an electric tool for improving efficiency, the output torque of the screwdriver can be dynamically monitored, the detection precision is high, the work of the screwdriver is dynamically adjusted, the torque overrun is avoided, the work stability is improved, and the service life is prolonged. In addition, the portable torque testing device also has the functions of a digital display manual torque screwdriver and a portable torque testing instrument which are used as testing tools.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

fig. 1 is a schematic structural diagram in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a partial structure in an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a power supply circuit of an energy storage device according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a temperature monitoring circuit of a driving device according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a torque detection circuit in operation of the driving device according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a control circuit for controlling the operation of the power supply of the device according to the embodiment of the present invention;

fig. 7 is a schematic circuit diagram of a control circuit of the control device according to an embodiment of the present invention;

fig. 8 is a schematic circuit diagram of an operating circuit of a display panel according to an embodiment of the present invention;

fig. 9 is a schematic circuit diagram of a control circuit for switching operation according to an embodiment of the present invention;

fig. 10 is a schematic circuit diagram of a control circuit for operating the driving device according to an embodiment of the present invention;

wherein: 1-a shell; 2-an energy storage device; 3-a control device; 31-a display screen; 32-a switch; 4-a detection device; 41-a first fixture block; 42-a second fixture block; 43-an elastomer; 44-an inductor; 5-a drive device; 51-a motor; 52-a reducer; 6-output shaft assembly; 61-batch head; 7-a first bearing; 8-second bearing.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.

Examples

As shown in fig. 1-10, a multifunctional precise numerical control electric screwdriver comprises a housing 1, an energy storage device 2, a control device 3, a detection device 4, a driving device 5 and an output shaft assembly 6, wherein the energy storage device 2, the control device 3, the detection device 4, the driving device 5 and the output shaft assembly 6 are all clamped inside the housing 1, two ends of the driving device 5 are respectively clamped with the inside of the housing 1 through a first bearing 7 and a second bearing 8, an output end of the driving device 5 of the output shaft assembly 6 is connected, the detection device 4 is connected with the surface of the driving device 5, the detection device 4 comprises a first clamping block 41, a second clamping block 42, an elastic body 43 and an inductor 44, the inductor 44 is arranged on the elastic body 43, the first clamping block 41 and the second clamping block 42 are respectively connected with two ends of the elastic body 43, the first clamping block 41 is clamped with the surface of the driving device 5, the second clamping block 42 is clamped on the, the energy storage device 2, the inductor 44 and the driving device 5 are all electrically connected with the control device 3. In practical application, the detection device 4 is preferentially arranged at the rear end of the driving device 5, based on the structural design, the detection device 4 does not need to be designed into a coaxial hollow body for avoiding the output shaft assembly 6, but can be conveniently reduced, the elastic body 43 in the detection device 4 can be designed into a long and narrow flat sheet in the middle axis of torsion, and according to the knowledge related to the torsional rigidity of material mechanics, the torsional rigidity of the flat elastic body 43 is obviously smaller than that of the cylindrical elastic body 43, so that the strain gauge adhered to the surface of the flat elastic body can obtain larger deformation, output more obvious differential signals and realize more accurate torque measurement; meanwhile, the test shows that: the width of 10.0 mm, the thickness of 2.0 mm, the heat treatment hardness HRC40 degree spring steel sheet, two side each paste a Hualan sea BF1000-3HA-E half bridge strain gauge (a kind in inductor 44), when the bridge voltage is 2.5V, under the torque effect of 400Ncm, the differential signal output amplitude is 10.6 mV. The same strain gauge is attached to a preposed torque detection unit with a size suitable for the size shown in the patent CN103934673B, for example, the outer diameter is 14.0 mm, the outer side of a steel pipe with the wall thickness of 0.5 mm, the same torque only generates a differential signal of 1.1mV (which is easily interfered by environmental signals), and the result is consistent with the torsional rigidity theory, so the detection precision of the technical scheme in the application is higher; meanwhile, the supporting structure of the driving device 5 in the application is different from the cantilever support of the patent CN103934673B, in the application, the whole driving device 5 is supported by a double bearing, and is reliably and radially clamped in the housing 1, so that the measurement error caused by the knocking and rough contact of the driving device 5 to the housing 1 in an impact working environment is prevented, and meanwhile, the torque can fully act on the elastic body 43, and the measurement precision is improved; the first bearing 7 and the second bearing 8 are preferably deep groove ball bearings, and the structure is designed to enable the driving device 5 to be clamped in the shell 1 in a circumferentially rotatable and axially slidable mode; holes or grooves are formed in the first fixture block 41 and the second fixture block 42, and connecting wires of the motor 51 and the sensor 44 are respectively routed, so that interference is reduced; the control device 3 has the program functions of disassembling or screwing according to a target torque value, monitoring the number of turns, locking the motor 51, displaying torque, monitoring current, monitoring temperature, controlling charging, recording working condition data and the like, and is also provided with an LED, a buzzer, a vibrator and the like, wherein the LED is used for the work illumination and the visual feedback of the output shaft assembly 6, the buzzer can provide auditory feedback in use, and the vibrator can provide tactile feedback in use; in operation, the output shaft assembly 6 is matched with a screw to be screwed; then the control device 3 controls the driving device 5 to start working; the output end of the driving device 5 rotates to drive the output shaft assembly 6 to rotate; when the output shaft assembly 6 drives the screw to rotate, the reaction resistance from the screw is received, and the reaction resistance is transmitted to the driving device 5 through the output shaft assembly 6; the driving device 5 has a turnover along the first bearing 7 and the second bearing 8 under the action of the reaction resistance; the first clamping block 41 clamped with the surface of the driving device 5 is driven to synchronously rotate; the elastic body 43 connected with the first latch 41 is twisted by the first latch 41; the sensor 44 arranged on the elastic body 43 monitors the torsion amount of the elastic body 43 in real time and transmits the monitored information to the control device 3 in real time; the control device 3 processes the information and regulates and controls the working state of the driving device 5 in real time according to the processed result, so that torque overrun is avoided, and the screwdriver is more stable in working; meanwhile, the control device 3 processes the information to obtain real-time output torque, and the output torque is displayed on a display screen in real time, so that the working state of the screwdriver can be monitored in real time; the screwdriver can dynamically monitor the torque of the screwdriver and dynamically adjust the work of the screwdriver, so that the torque is prevented from exceeding the limit; meanwhile, the precision measurement of the small torque is realized, the detection precision is high, the structure is simple, the carrying is convenient, the working stability is high, and the service life is long.

Preferably, in order to realize the functions of the digital-display torque manual screwdriver and the portable torque detector, the motor is a brushless motor with an internal brake structure. In addition, other mechanisms which can achieve the same effect, such as an electromagnetic brake device, a rotation stopping pin and the like, can be used for stopping the rotating part of the power transmission chain.

Preferably, the sensor 44 is a strain gauge, a grating scale, a magnetic grating scale, a high sensitivity inductive displacement probe, a high sensitivity capacitive displacement probe, or a high sensitivity piezoelectric patch. The inductor 44 is preferably a strain gage in the present application; in practical application, a half-bridge strain gauge is respectively adhered to the front surface and the back surface of the elastic body 43, and the strain gauges are electrically connected with the control device 3; in operation, the amplitude optimal value of the differential signal generated by the strain gauge is between plus or minus 5mV and plus or minus 15mV, so that the differential signal has a relatively high signal-to-noise ratio, and a certain safety margin is reserved for processing practical situations such as overload.

Preferably, the energy storage device 2 is a nickel-cadmium battery, a nickel-hydrogen battery or a lithium ion battery. In addition, the energy storage device 2 may be another battery that can achieve the same effect, and may be flexibly set according to actual conditions.

Preferably, the control device 3 is a single chip microcomputer or a PLC. Besides, the control device 3 may be another device capable of achieving the same effect, and may be flexibly set according to actual conditions.

Preferably, the control device 3 is provided with a display screen 31 and a switch 32, both the display screen 31 and the switch 32 penetrate through the casing 1, and both the display screen 31 and the switch 32 are electrically connected with the control device 3. The switch 32 is used for controlling the working state of the screwdriver, and the display screen 31 is used for displaying the working state and relevant parameters of the screwdriver, so that the structural design is convenient for monitoring the working of the screwdriver in real time.

Preferably, the switch 32 is a push button switch or a photoelectric switch. The photoelectric switch is preferably selected to be electrically connected with the control device 3, and the structural design is favorable for avoiding contact oxidation and improving the sensitivity.

Preferably, the driving device 5 comprises a motor 51 and a speed reducer 52, and the output shaft assembly 6 is connected with the output end of the motor 51 through the speed reducer 52. In the present application, the motor 51 is preferably a brushless motor, and the reducer 52 is preferably a planetary reducer, which can increase the stability of the operation.

Preferably, the rear end of the housing is provided with a plug or socket. The structure design is beneficial to charging the screwdriver or carrying out communication control on the screwdriver.

Preferably, one end of the output shaft assembly 6 is provided with a bit 61. The structural design is beneficial to screwing the screw.

Preferably, the utility model discloses in provide 2 power supply circuit of energy memory, 5 temperature monitoring circuit of drive arrangement, 5 control circuit and the control circuit of 5 work of drive arrangement of torque detection circuit, the 3 power work of controlling means, the control circuit of the 3 control circuit of controlling means, the working circuit of display screen 31, the control circuit of switch 32 work of drive arrangement in the work.

The utility model discloses a theory of operation is: in practical application, the detection device 4 is preferentially arranged at the rear end of the driving device 5, based on the structural design, the detection device 4 does not need to be designed into a coaxial hollow body for avoiding the output shaft assembly 6, but can be conveniently reduced, the elastic body 43 in the detection device 4 can be designed into a long and narrow flat sheet in the middle axis of torsion, and according to the knowledge related to the torsional rigidity of material mechanics, the torsional rigidity of the flat elastic body 43 is obviously smaller than that of the cylindrical elastic body 43, so that the strain gauge adhered to the surface of the flat elastic body can obtain larger deformation, output more obvious differential signals and realize more accurate torque measurement; meanwhile, the test shows that: the width of 10.0 mm, the thickness of 2.0 mm, the heat treatment hardness HRC40 degree spring steel sheet, two side each paste a Hualan sea BF1000-3HA-E half bridge strain gauge (a kind in inductor 44), when the bridge voltage is 2.5V, under the torque effect of 400Ncm, the differential signal output amplitude is 10.6 mV. The same strain gauge is attached to a preposed torque detection unit with a size suitable for the size shown in the patent CN103934673B, for example, the outer diameter is 14.0 mm, the outer side of a steel pipe with the wall thickness of 0.5 mm, the same torque only generates a differential signal of 1.1mV (which is easily interfered by environmental signals), and the result is consistent with the torsional rigidity theory, so the detection precision of the technical scheme in the application is higher; meanwhile, the supporting structure of the driving device 5 in the application is different from the cantilever support of the patent CN103934673B, in the application, the whole driving device 5 is supported by a double bearing, and is reliably and radially clamped in the housing 1, so that the measurement error caused by the knocking and rough contact of the driving device 5 to the housing 1 in an impact working environment is prevented, and meanwhile, the torque can fully act on the elastic body 43, and the measurement precision is improved; the first bearing 7 and the second bearing 8 are preferably deep groove ball bearings, and the structure is designed to enable the driving device 5 to be clamped in the shell 1 in a circumferentially rotatable and axially slidable mode; holes or grooves are formed in the first fixture block 41 and the second fixture block 42, and connecting wires of the motor 51 and the sensor 44 are respectively routed, so that interference is reduced; the control device 3 has the program functions of disassembling or screwing according to a target torque value, monitoring the number of turns, locking the motor 51, displaying torque, monitoring current, monitoring temperature, controlling charging, recording working condition data and the like, and is also provided with an LED, a buzzer, a vibrator and the like, wherein the LED is used for the work illumination and the visual feedback of the output shaft assembly 6, the buzzer can provide auditory feedback in use, and the vibrator can provide tactile feedback in use; in operation, the output shaft assembly 6 is matched with a screw to be screwed; then the control device 3 controls the driving device 5 to start working; the output end of the driving device 5 rotates to drive the output shaft assembly 6 to rotate; when the output shaft assembly 6 drives the screw to rotate, the reaction resistance from the screw is received, and the reaction resistance is transmitted to the driving device 5 through the output shaft assembly 6; the driving device 5 has a turnover along the first bearing 7 and the second bearing 8 under the action of the reaction resistance; the first clamping block 41 clamped with the surface of the driving device 5 is driven to synchronously rotate; the elastic body 43 connected with the first latch 41 is twisted by the first latch 41; the sensor 44 arranged on the elastic body 43 monitors the torsion amount of the elastic body 43 in real time and transmits the monitored information to the control device 3 in real time; the control device 3 processes the information and regulates and controls the working state of the driving device 5 in real time according to the processed result, so that torque overrun is avoided, and the screwdriver is more stable in working; meanwhile, the control device 3 processes the information to obtain real-time output torque, and the output torque is displayed on a display screen in real time, so that the working state of the screwdriver can be monitored in real time; the screwdriver can dynamically monitor the torque of the screwdriver and dynamically adjust the work of the screwdriver, so that the torque is prevented from exceeding the limit; meanwhile, the precision measurement of the small torque is realized, the detection precision is high, the structure is simple, the carrying is convenient, the working stability is high, and the service life is long.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides an electronic screwdriver of multi-functional accurate numerical control which characterized in that: comprises a shell (1), an energy storage device (2), a control device (3), a detection device (4), a driving device (5) and an output shaft assembly (6), wherein the energy storage device (2), the control device (3), the detection device (4), the driving device (5) and the output shaft assembly (6) are all clamped in the shell (1), two ends of the driving device (5) are respectively clamped in the shell (1) through a first bearing (7) and a second bearing (8), the output shaft assembly (6) is connected with the output end of the driving device (5), the detection device (4) is connected with the surface of the driving device (5), the detection device (4) comprises a first clamping block (41), a second clamping block (42), an elastic body (43) and an inductor (44), and the inductor (44) is arranged on the elastic body (43), the first clamping block (41) and the second clamping block (42) are respectively connected with two ends of the elastic body (43), the first clamping block (41) is clamped with the surface of the driving device (5), the second clamping block (42) is clamped on the inner wall of the shell (1), and the energy storage device (2), the inductor (44) and the driving device (5) are electrically connected with the control device (3).

2. The multifunctional precise numerical control electric screwdriver as recited in claim 1, characterized in that: the sensor (44) is a strain gauge, a grating ruler, a magnetic grating ruler, a high-sensitivity inductive displacement probe, a high-sensitivity capacitive displacement probe or a high-sensitivity piezoelectric plate.

3. The multifunctional precise numerical control electric screwdriver as recited in claim 1, characterized in that: the energy storage device (2) is a nickel-cadmium battery, a nickel-hydrogen battery or a lithium ion battery.

4. The multifunctional precise numerical control electric screwdriver as recited in claim 1, characterized in that: the control device (3) is a single chip microcomputer or a PLC.

5. The multifunctional precise numerical control electric screwdriver as recited in claim 1, characterized in that: control device (3) are provided with display screen (31) and switch (32), display screen (31) switch (32) all run through casing (1), display screen (31) switch (32) all with control device (3) electricity is connected.

6. The multifunctional precise numerical control electric screwdriver according to claim 5, characterized in that: the switch (32) is a key switch or a photoelectric switch.

7. The multifunctional precise numerical control electric screwdriver as recited in claim 1, characterized in that: the driving device (5) comprises a motor (51) and a speed reducer (52), and the output shaft assembly (6) is connected with the output end of the motor (51) through the speed reducer (52).

8. The multifunctional precise numerical control electric screwdriver as recited in claim 1, characterized in that: the rear end of the shell (1) is provided with a plug or a socket.

9. The multifunctional precise numerical control electric screwdriver as recited in claim 1, characterized in that: one end of the output shaft assembly (6) is provided with a batch head (61).

10. The multifunctional precise numerical control electric screwdriver as recited in claim 1, characterized in that: the control device (3) is further provided with an LED, a buzzer and a vibrator, and the LED, the buzzer and the vibrator are all electrically connected with the control device (3).