High-precision intelligent lithium battery digital torque wrench

Abstract

The utility model relates to the technical field of hardware tools discloses a high accuracy intelligent lithium electricity digital torque wrench, including handle and with its fixed connection's pincers, the inside fixed of handle is equipped with drive motor, the output of drive motor is connected with the one end of transmission shaft fixedly, the other end of transmission shaft is equipped with transmission gear, transmission shaft rotatoryly sets up in the inside of pincers, the inside rotatory of pincers is equipped with the ratchet wheel gear ring meshing connection of transmission gear, the inside rotatory of pincers is equipped with square wedge head, the utility model discloses two strain gauge type high accuracy torque sensors of symmetrical arrangement on the surface of transmission shaft are adopted, and the real -time accurate monitoring to output torque is realized in combination with accurate signal processing circuit and intelligent control algorithm, and this design effectively eliminates the measurement error caused by eccentric load, improves torque measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of hardware tool technology, specifically a high-precision intelligent lithium-ion digital torque wrench. Background Technology

[0002] As an important fastening tool, torque wrenches are widely used in fields such as machinery manufacturing, automobile repair, aerospace, and engineering construction to apply precise torque values ​​to fasteners such as bolts and nuts, ensuring the reliability and safety of the connections. Traditional torque wrenches are mainly divided into two categories: manual mechanical and digital display. Existing electric torque wrenches mostly use a simple motor drive structure, directly outputting torque after gear reduction. Although these products reduce manual force application, they still have the following problems: First, the torque control accuracy is not high, usually relying on indirect measurement methods such as current detection, which has a large error. Second, they lack an effective torque overload protection mechanism, which can easily lead to damage to fasteners. Third, their structural layout is unreasonable, often resulting in bulky size and unstable center of gravity, affecting operational flexibility. Fourth, their functions are limited, lacking practical functions such as quick steering switching and quick tool replacement. Utility Model Content

[0003] The purpose of this invention is to provide a high-precision intelligent lithium-ion digital torque wrench with high-precision torque control and measurement capabilities.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a high-precision intelligent lithium-ion digital torque wrench, comprising a handle and a clamp body fixedly connected thereto, wherein a drive motor is fixedly installed inside the handle, the output end of the drive motor is fixedly connected to one end of a transmission shaft, the other end of the transmission shaft is provided with a transmission gear, the transmission shaft is rotatably installed inside the clamp body, a ratchet gear ring is rotatably installed inside the clamp body and meshes with the transmission gear, a square wedge is rotatably installed inside the clamp body, a support column is fixedly installed on the top of the square wedge, a ratchet pawl is rotatably installed on the top of the support column, an internal gear ring is provided on the inner wall of the clamp body, the end of the ratchet pawl meshes with the internal gear ring and the ratchet gear ring, a quick-release mechanism is provided at the bottom of the square wedge, and a steering mechanism is provided at the top of the square wedge.

[0005] A further feature of this invention is that the output end of the drive motor is connected to the input end of the reducer, and the output end of the reducer is fixedly connected to one end of the transmission shaft.

[0006] A further feature of this invention is that a locking ring is fixedly provided inside the handle, and a reinforcing steel pipe is installed in the internal thread of the locking ring. The drive motor and the reducer are located inside the reinforcing steel pipe.

[0007] A further feature of this invention is that: a lithium battery and a control circuit are provided inside the reinforcing steel pipe; a display screen is provided on the outside of the handle; and two strain gauge-type high-precision torque sensors are provided on the surface of the transmission shaft. The high-precision torque sensors are electrically connected to the display screen through the control circuit.

[0008] A further feature of this invention is that the steering mechanism includes a push rod, which is slidably connected to the square wedge head. The surface of the push rod is provided with a mounting hole, and a reversing spring is installed inside the mounting hole. The end of the reversing spring is provided with a reversing steel ball. The inner side of the ratchet pawl is provided with two adjusting grooves that cooperate with the reversing steel balls. When the push rod rotates, it drives the reversing spring and the reversing steel balls to rotate, cooperating with different adjusting grooves on the ratchet pawl to adjust the meshing direction of the ratchet pawl with the internal gear ring and the ratchet gear ring, thereby realizing the forward and reverse rotation of the square wedge head.

[0009] A further feature of this invention is that a knob is fixedly provided at the top of the push rod, a push spring is sleeved on the top of the push rod, and a button is fixedly provided at the end of the push rod.

[0010] A further feature of this invention is that the quick-release mechanism for the screwdriver includes a positioning post and a quick-release steel ball. The positioning post is fixedly installed at the bottom end of the push rod. The bottom of the push rod is provided with two stepped positioning grooves. The top of one side of the square wedge head is provided with a slot. The quick-release steel ball is engaged inside the slot. The sleeve of the screwdriver is engaged at the bottom of the square wedge head. Under the action of the push spring, the push rod is reset upward, so that the quick-release steel ball is engaged in the shallower positioning groove, thereby achieving the clamping of the screwdriver.

[0011] In summary, this utility model has the following beneficial effects: 1. By employing two strain gauge high-precision torque sensors symmetrically arranged on the surface of the drive shaft, combined with a sophisticated signal processing circuit and intelligent control algorithm, real-time and accurate monitoring of the output torque is achieved. This design effectively eliminates measurement errors caused by eccentric loads, improves torque measurement accuracy, and the control circuit can immediately cut off the motor power when the torque reaches the preset value, avoiding the over-tightening or under-tightening problems caused by the operator's judgment when relying on traditional wrenches. It is particularly suitable for assembly occasions with strict requirements for tightening torque. 2. The integrated lithium battery drive system eliminates the physical exertion required by traditional manual wrenches, allowing operators to easily complete high-intensity tightening operations. The quick-release mechanism of the screwdriver achieves rapid tool replacement through the ingenious combination of push rod, quick-release steel ball and stepped positioning groove, greatly reducing auxiliary operation time. The steering mechanism can change the output direction with a simple knob operation, eliminating the trouble of flipping traditional ratchet wrenches, which is especially convenient when working in confined spaces. 3. The reinforced steel tube and locking ring inside the handle form a robust support frame, effectively improving the overall structural rigidity. The design of placing the drive motor and reducer inside the reinforced steel tube not only optimizes the force transmission path but also reduces vibration and deformation during operation, ensuring consistent transmission accuracy. This structural design significantly improves the product's durability under long-term high-load conditions, extending its service life. 4. The combined design of the drive motor and reducer, through a reasonable reduction ratio, converts the high-speed, low-torque output of the motor into a low-speed, high-torque output suitable for bolt tightening, which ensures sufficient output capacity while maintaining the high-efficiency operating range of the motor. Attached Figure Description

[0012] Figure 1 This is one of the three-dimensional structural schematic diagrams of this utility model; Figure 2 This is the second three-dimensional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the exploded structure of this utility model; Figure 4 This is a cross-sectional structural diagram of the present invention; Figure 5 This is a schematic diagram of the structure of the clamp body of this utility model; Figure 6 This is a schematic diagram of the push rod of this utility model.

[0013] In the diagram: 1. Handle; 101. Locking ring; 102. Reinforcing steel pipe; 2. Lithium battery; 3. Control circuit; 4. Drive motor; 5. Reducer; 6. Drive shaft; 601. Drive gear; 7. Display screen; 8. Clamp body; 801. Internal gear ring; 9. Ratchet gear ring; 10. Square wedge head; 11. Support column; 12. Ratchet pawl; 13. Push rod; 1301. Mounting hole; 1302. Positioning groove; 1303. Quick release steel ball; 14. Push spring; 15. Reversing spring; 16. Reversing steel ball; 17. Knob; 18. Button. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings of the embodiments thereof.

[0015] Please see Figures 1-6 In this embodiment of the utility model, a high-precision intelligent lithium-ion digital torque wrench includes a handle 1 and a clamp body 8. The handle 1 and the clamp body 8 are fixedly connected to form an integral structure. The handle 1 integrates drive, control and power supply components, and the clamp body 8 is provided with a transmission and torque output mechanism. The overall design is compact, easy to operate by hand, and suitable for high-precision torque tightening operations.

[0016] The handle 1 is cylindrical or ergonomically designed, and a drive motor 4 is fixedly installed inside. The drive motor 4 is preferably a DC brushless motor, powered by a lithium battery 2, and intelligently controlled by a control circuit 3. The output end of the drive motor 4 is connected to a ratchet mechanism inside the clamp body 8 through a transmission shaft 6, ultimately driving the square wedge head 10 to output torque. The bottom of the square wedge head 10 is equipped with a quick-release mechanism for quickly installing and replacing socket tools. At the same time, the top of the square wedge head 10 is equipped with a steering mechanism, allowing users to switch the forward and reverse directions of the output shaft to achieve tightening or loosening operations.

[0017] During operation, after the drive motor 4 starts, it drives the ratchet gear ring 9 to rotate through the transmission shaft 6 and gear transmission. The ratchet pawl 12 meshes with the ratchet gear ring 9 and the internal gear ring 801, converting the rotational motion into the intermittent rotational output of the square wedge head 10; the torque sensor monitors the torque of the transmission shaft 6 in real time, and processes the data through the control circuit 3 and displays it on the display screen 7; the user can achieve high-precision control by preset torque values, and when the set torque is reached, the control circuit 3 can automatically cut off the motor power or issue an alarm.

[0018] The drive motor 4 is fixedly installed inside the handle 1; in order to improve torque output and optimize motor performance, the output end of the drive motor 4 is connected to the input end of the reducer 5; the reducer 5 is preferably a planetary gear reducer, and its output end is fixedly connected to one end of the transmission shaft 6; the transmission shaft 6 is rotatably installed inside the clamp body 8, and its other end is provided with a transmission gear 601; the transmission gear 601 meshes with the ratchet gear ring 9 to transmit the rotational power of the motor to the ratchet mechanism.

[0019] Two strain gauge high-precision torque sensors are provided on the surface of the drive shaft 6. These sensors are symmetrically arranged to eliminate eccentricity error. The torque sensors are electrically connected to the display screen 7 through the control circuit 3 to detect and display the torque value in real time. The control circuit 3 includes a microprocessor and a signal conditioning circuit, which are used to process sensor data, control the motor start and stop, and realize user interaction.

[0020] A locking ring 101 is fixed inside the handle 1. The locking ring 101 is usually a metal ring and is installed in the handle housing by threads. A reinforcing steel pipe 102 is fixed inside the locking ring 101. The reinforcing steel pipe 102 serves as the core support structure. The drive motor 4 and the reducer 5 are located inside the reinforcing steel pipe 102. This design improves the overall rigidity, reduces vibration and deformation, and ensures transmission accuracy.

[0021] The interior of the reinforced steel pipe 102 is also equipped with a lithium battery 2 and a control circuit 3; the lithium battery 2 is a rechargeable high-energy-density lithium battery, which is charged through the charging interface on the outside of the handle 1; the outside of the handle 1 is equipped with a display screen 7, which is preferably an LCD or OLED display screen, used to display information such as torque value, battery level and working mode in real time.

[0022] The clamp body 8 has a ratchet gear ring 9 inside which rotates and meshes with the transmission gear 601; the clamp body 8 also has a square wedge head 10 inside which rotates and a support column 11 is fixedly mounted on the top of the square wedge head 10, and a ratchet pawl 12 is rotatably mounted on the top of the support column 11; the inner wall of the clamp body 8 has an inner gear ring 801, and the end of the ratchet pawl 12 meshes with the inner gear ring 801 and the ratchet gear ring 9.

[0023] When the drive motor 4 drives the ratchet gear ring 9 to rotate, the ratchet pawl 12 swings under the constraint of the internal gear ring 801, pushing the square wedge head 10 to rotate intermittently; this ratchet design allows idling in the non-drive direction, improving operating efficiency; the bottom of the square wedge head 10 is provided with a screwdriver quick-release mechanism for quickly connecting the socket tool.

[0024] The steering mechanism is used to switch the rotation direction of the square wedge head 10 to achieve forward or reverse rotation. The steering mechanism includes a push rod 13, which is slidably connected to the square wedge head 10. The surface of the push rod 13 is provided with a mounting hole 1301, and a reversing spring 15 is installed inside the mounting hole 1301. The end of the reversing spring 15 is provided with a reversing steel ball 16. The inner side of the ratchet pawl 12 is provided with two adjustment grooves that cooperate with the reversing steel ball 16.

[0025] When the user rotates the push rod 13, the push rod 13 drives the reversing spring 15 and the reversing steel ball 16 to rotate, so that the reversing steel ball 16 engages with different adjustment slots on the ratchet pawl 12; by changing the meshing angle between the ratchet pawl 12 and the internal gear ring 801 and the ratchet gear ring 9, the swing direction of the ratchet pawl 12 is adjusted, thereby realizing the forward and reverse switching of the square wedge head 10.

[0026] A knob 17 is fixedly provided at the top of the push rod 13, and the user can operate the steering mechanism by rotating the knob 17. A push spring 14 is sleeved on the top of the push rod 13, which provides a restoring force to keep the push rod 13 in the default position; a button 18 is fixedly provided at the end of the push rod 13, which is used to trigger the release of the quick release mechanism.

[0027] The quick-release mechanism for screwdrivers is used for the rapid installation and removal of socket tools. This mechanism includes a positioning pin and a quick-release steel ball 1303. The positioning pin is fixedly mounted at the bottom end of the push rod 13, and the bottom of the push rod 13 has two stepped positioning grooves 1302. A slot is provided on the top of one side of the square wedge head 10, and the quick-release steel ball 1303 engages inside the slot.

[0028] When installing the sleeve, the sleeve interface is engaged with the bottom of the square wedge head 10; under the action of the push spring 14, the push rod 13 returns to its original position upward, causing the quick-release steel ball 1303 to engage in the shallower positioning groove 1302, thereby locking the sleeve onto the square wedge head 10; when the sleeve needs to be replaced, the user presses the button 18, pushes the push rod 13 downward to compress the push spring 14, causing the quick-release steel ball 1303 to move into the deeper positioning groove 1302, the quick-release steel ball 1303 disengages from the groove, and the sleeve can be easily removed.

[0029] In use, the user starts the device via the switch on control circuit 3. The DC power provided by lithium battery 2 is delivered to drive motor 4. Drive motor 4 is a brushless DC motor, whose rotor begins to rotate under the action of stator magnetic field, outputting mechanical energy with a relatively high initial speed but low torque. The rotational power output by drive motor 4 is first transmitted to reducer 5. Reducer 5 uses a planetary gear structure, achieving speed reduction and torque increase through multi-stage gear transmission. Specifically, the input high-speed, low-torque motion is transformed into low-speed, high-torque output through the meshing transmission of sun gear, planet gears, and ring gear. The reduction ratio is usually designed between 15:1 and 30:1 to meet the high torque requirements of bolt tightening. The power processed by reducer 5 is transmitted to drive shaft 6 through spline connection. The transmission gear 601 at the front end of the transmission shaft 6 meshes orthogonally with the ratchet ring 9 at a 90-degree angle, realizing the conversion of the power direction. This design converts the rotational motion parallel to the handle axis into a rotational motion perpendicular to the handle axis, which meets the working requirements of the wrench head. The ratchet ring 9 starts to rotate under the drive of the transmission gear 601. The helical teeth on the inner side of the ratchet ring 9 mesh with the pawl head of the ratchet pawl 12. When the ratchet ring 9 rotates clockwise, its tooth surface pushes the contact surface of the ratchet pawl 12, causing the ratchet pawl 12 to swing around the axis of the support column 11. The swing of the ratchet pawl 12 is transmitted to the square wedge head 10 through the support column 11. Since the ratchet pawl 12 also meshes with the inner gear ring 801 on the inner wall of the clamp body 8, under the constraint of the inner gear ring 801, the ratchet pawl... The oscillation of ratchet pawl 12 is converted into intermittent rotational motion of square wedge head 10. This "oscillation-rotation" conversion mechanism ensures smooth torque output. When ratchet ring 9 continues to rotate to the next tooth slot, ratchet pawl 12 returns to its original position, ready for the next push. During the return process, square wedge head 10 remains stationary. This design allows the motor to operate continuously while the output end works intermittently, improving work efficiency and reducing motor load. Two sets of strain gauge torque sensors are symmetrically attached to the surface of drive shaft 6. When drive shaft 6 transmits torque, it produces minute torsional deformation. The maximum strain is usually located at a 45-degree angle to the axis. The strain gauges change their resistance value as drive shaft 6 deforms, and the amount of change is proportional to the applied torque. The Wheatstone bridge composed of strain gauges will... The resistance change is converted into a weak voltage signal, which is initially amplified by the instrumentation amplifier in control circuit 3, and then converted into a digital signal by the analog-to-digital converter. The microprocessor in control circuit 3 uses a digital filtering algorithm to eliminate noise interference and calculates the real-time torque value. The microprocessor compares the detected real-time torque with the user-preset target torque value. When the real-time torque reaches 95%-100% of the preset value, control circuit 3 will reduce the motor speed to achieve precise control. When the preset torque reaches 100%, the power supply to the motor is immediately cut off. When the user rotates knob 17, push rod 13 rotates accordingly. The reversing steel ball 16 on push rod 13 disengages from the current adjustment slot inside ratchet pawl 12 under the pressure of reversing spring 15.When the knob 17 is rotated to the predetermined position (with clear forward / reverse markings), the reversing steel ball 16 is pushed into another adjustment slot by the reversing spring 15. Different adjustment slots correspond to different initial angles of the ratchet pawl 12, thereby changing the meshing relationship between the ratchet pawl 12 and the internal gear ring 801 and the ratchet gear ring 9. When the initial angle of the ratchet pawl 12 changes, its swing direction driven by the ratchet gear ring 9 changes accordingly, causing the rotation direction of the square wedge head 10 to reverse. In the non-operating state, the elastic force of the push spring 14 pushes the push rod 13 to move upward, so that the quick-release steel ball 1303 is located in the shallow groove area of ​​the stepped positioning groove 1302 at the bottom of the push rod. At this time, the quick-release steel ball 1303 protrudes from the square wedge head 1. The slot on the surface of the socket tool is embedded in the mounting hole of the socket tool, forming a mechanical interlock. When the socket needs to be replaced, the user presses button 18, pushing push rod 13 downward against the elastic force of push spring 14. When push rod 13 moves to a specific position, quick-release steel ball 1303 corresponds to the deep groove area of ​​positioning groove 1302, and quick-release steel ball 1303 loses its constraint and is completely retracted into the square wedge head 10 under the pressure of the socket tool, thus releasing the lock. With button 18 pressed, the socket tool can be easily removed from the square wedge head 10. After replacing the socket, release button 18, push rod 13 resets under the action of push spring 14, and quick-release steel ball 1303 protrudes again and locks into the mounting hole of the new socket, completing the locking.

[0030] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A high-precision intelligent lithium-ion digital torque wrench, comprising a handle (1) and a clamp body (8) fixedly connected thereto, characterized in that, The handle (1) is fixedly equipped with a drive motor (4). The output end of the drive motor (4) is fixedly connected to one end of the transmission shaft (6). The other end of the transmission shaft (6) is equipped with a transmission gear (601). The transmission shaft (6) is rotatably installed inside the clamp body (8). The clamp body (8) is rotatably equipped with a ratchet gear ring (9) that meshes with the transmission gear (601). The clamp body (8) is rotatably equipped with a square wedge head (10). The top of the square wedge head (10) is fixedly equipped with a support column (11). The top of the support column (11) is rotatably equipped with a ratchet pawl (12). The inner wall of the clamp body (8) is equipped with an internal gear ring (801). The end of the ratchet pawl (12) meshes with the internal gear ring (801) and the ratchet gear ring (9). The bottom of the square wedge head (10) is equipped with a screwdriver quick release mechanism. The top of the square wedge head (10) is equipped with a steering mechanism.

2. The high-precision intelligent lithium-ion digital torque wrench according to claim 1, characterized in that: The output end of the drive motor (4) is connected to the input end of the reducer (5), and the output end of the reducer (5) is fixedly connected to one end of the transmission shaft (6).

3. The high-precision intelligent lithium-ion digital torque wrench according to claim 2, characterized in that: The handle (1) is fixedly provided with a locking ring (101), and a reinforcing steel pipe (102) is installed inside the locking ring (101). The drive motor (4) and the reducer (5) are located inside the reinforcing steel pipe (102).

4. The high-precision intelligent lithium-ion digital torque wrench according to claim 3, characterized in that: The interior of the reinforced steel pipe (102) is equipped with a lithium battery (2) and a control circuit (3). The outside of the handle (1) is equipped with a display screen (7). The surface of the drive shaft (6) is equipped with two strain gauge-type high-precision torque sensors. The high-precision torque sensors are electrically connected to the display screen (7) through the control circuit (3).

5. The high-precision intelligent lithium-ion digital torque wrench according to claim 1, characterized in that: The steering mechanism includes a push rod (13), which is slidably connected to the square wedge (10). The surface of the push rod (13) is provided with a mounting hole (1301), and a reversing spring (15) is installed inside the mounting hole (1301). The end of the reversing spring (15) is provided with a reversing steel ball (16). The inner side of the ratchet pawl (12) is provided with two adjustment grooves that cooperate with the reversing steel ball (16). When the push rod (13) rotates, it drives the reversing spring (15) and the reversing steel ball (16) to rotate. By cooperating with different adjustment grooves on the ratchet pawl (12), the meshing direction of the ratchet pawl (12) with the internal gear ring (801) and the ratchet gear ring (9) is adjusted to realize the forward and reverse rotation of the square wedge (10).

6. The high-precision intelligent lithium-ion digital torque wrench according to claim 5, characterized in that: A knob (17) is fixedly provided at the top of the push rod (13), a push spring (14) is sleeved on the top of the push rod (13), and a button (18) is fixedly provided at the end of the push rod (13).

7. The high-precision intelligent lithium-ion digital torque wrench according to claim 6, characterized in that: The quick-release mechanism of the screwdriver includes a positioning post and a quick-release steel ball (1303). The positioning post is fixedly installed at the bottom end of the push rod (13). The bottom of the push rod (13) is provided with two stepped positioning grooves (1302). The top of one side of the square wedge (10) is provided with a slot. The quick-release steel ball (1303) is engaged in the inside of the slot. The sleeve of the screwdriver is engaged in the bottom of the square wedge (10). Under the action of the push spring (14), the push rod (13) is reset upward, so that the quick-release steel ball (1303) is engaged in the shallower positioning groove (1302), thereby achieving the clamping of the screwdriver.

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