A control device for an electric torque wrench

Abstract

This utility model relates to the field of electric torque wrench technology, specifically a control device for an electric torque wrench, comprising: a control module, a torque sensor, a motor, and a connecting mechanism. The torque sensor and motor are both electrically connected to the control module via wires. The connecting mechanism includes a sleeve coupling, with the opposite ends of the torque sensor and motor inserted into the sleeve coupling. The upper surface of the sleeve coupling has two insertion holes, and the interior of the sleeve coupling has a positioning groove communicating with the insertion holes. Even if the thread friction between the bolt and the thread groove decreases due to vibration or other factors, the positioning groove, through a positioning block, can prevent the bolt from loosening, ensuring a stable connection between the torque sensor and the motor. This ensures a stable connection between the torque sensor and the motor, allowing the torque sensor to detect torque more accurately and reducing errors during use.

Description

Technical Field

[0001] This utility model relates to the field of electric torque wrench technology, and in particular to a control device for an electric torque wrench. Background Technology

[0002] Electric torque wrenches, as important assembly tools, are widely used in automobile manufacturing, machinery installation, and other fields. With the development of industrial automation, higher demands are being placed on the accuracy and efficiency of torque control. Currently, torque sensors are the main structure in the control device of electric torque wrenches used for detecting torque.

[0003] Currently, torque sensors are typically fixed to the output shaft of a motor using threaded connectors. During the tightening process, when the set torque value is reached, the instantaneous action of the internal release mechanism impacts the fastener, causing impact vibration. This reduces the thread friction between the threaded connectors, increases the probability of the threaded connectors loosening, makes it difficult for the torque sensor to operate stably, and increases the torque detection error.

[0004] Therefore, a control device for electric torque wrenches is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a control device for an electric torque wrench to solve the above-mentioned problems, thereby improving the problem that the torque sensor is difficult to stably connect with the motor output shaft in the control device for an electric torque wrench, which increases the torque detection error.

[0006] The present invention achieves the above objectives through the following technical solution: a control device for an electric torque wrench, comprising: a control module, a torque sensor, a motor, and a connecting mechanism, wherein the torque sensor and the motor are both electrically connected to the control module via wires; Preferably, the connecting mechanism includes a sleeve coupling, with the opposite ends of the torque sensor and the motor both inserted into the sleeve coupling. The upper surface of the sleeve coupling has two insertion holes, and the inside of the sleeve coupling has a positioning groove communicating with the insertion holes. A bolt is inserted into the insertion hole, and the head of the bolt has a cavity aligned with the positioning groove. A positioning block that is inserted into the positioning groove is slidably connected inside the cavity, and the center line of the positioning block is perpendicular to the axis of the bolt.

[0007] Preferably, the connecting mechanism further includes a triggering component, which includes a guide frame slidably connected inside the cavity. The guide frame has a guide bevel at its side end, which gradually moves away from the positioning block from bottom to top. A square frame that is fixedly connected to the positioning block is slidably connected inside the guide bevel.

[0008] Preferably, a pressure plate is fixedly connected to the top of the guide frame. The pressure plate is located inside the adjustment groove of the bolt head, and the horizontal cross-sectional diameter of the pressure plate is larger than the horizontal cross-sectional inner diameter of the insertion cavity.

[0009] Preferably, a spring is provided between the pressure plate and the adjusting groove of the bolt head, and the spring is always in a compressed state.

[0010] Preferably, the spring is sleeved on the outside of the guide frame, and the spring is a rubber material component.

[0011] Preferably, a limiting groove is provided between the pressure plate and the adjusting groove of the bolt head, and the two ends of the spring respectively pass through the interior of the two limiting grooves.

[0012] Preferably, the distance ratio between the square frame and the inner bottom wall and inner top wall of the guide bevel is 1:5.

[0013] The beneficial effects of this utility model are: 1. Even if the friction between the bolt and the thread groove is reduced due to factors such as vibration, the positioning groove can prevent the bolt from loosening through the positioning block, so that the entire connection mechanism can stably connect the torque sensor and the motor together. This ensures that the torque sensor and the motor can be stably connected, so that the torque sensor can detect the torque more accurately and reduce the error during use. 2. When loading and unloading bolts, workers only need to insert and remove a hex wrench to simultaneously unlock or lock the trigger component, causing the trigger component to drive the positioning block to retract into the cavity or engage with the positioning slot. This eliminates the need for workers to adjust the trigger component separately, further reducing the workload of loading and unloading. Attached Figure Description

[0014] Figure 1 This is a system flowchart of the present invention; Figure 2 This is a schematic diagram showing the connection between the torque sensor, the motor, and the connecting mechanism in this utility model; Figure 3 This is a partial cutaway schematic diagram of the torque sensor, motor, and connecting mechanism in this utility model; Figure 4 for Figure 3 Enlarged view of A in the middle; Figure 5 This is a partial exploded view of the connecting mechanism in this utility model.

[0015] In the diagram: 100, control module; 200, torque sensor; 300, motor; 400, connecting mechanism; 410, sleeve coupling; 411, insertion hole; 412, positioning groove; 420, bolt; 421, insertion cavity; 430, positioning block; 440, trigger assembly; 441, guide frame; 442, guide bevel; 443, square frame; 444, pressure plate; 445, spring; 450, limit groove. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In practical implementation: such as Figure 1-5 As shown, a control device for an electric torque wrench includes: a control module 100, a torque sensor 200, a motor 300, a connecting mechanism 400, and a transmission auxiliary mechanism. The torque sensor 200 and the motor 300 are both electrically connected to the control module 100 via wires. The motor 300 can be a brushless DC motor or a stepper motor. The controller can be an ARM Cortex-M4 series microcontroller or a DSP controller. The torque sensor 200 is a strain gauge torque sensor. The control module 100 includes a controller, a signal processor, a touch panel, a display, a motor driver, a wireless communication module, and a wireless terminal. The motor driver, the display, the wireless communication module, and the signal processor are all electrically connected to the controller via wires. The touch panel is electrically connected to the signal processor via wires. The wireless communication module communicates with the wireless terminal via wireless signals. The motor driver is electrically connected to the motor 300 via wires. The transmission auxiliary mechanism includes an optional reducer, the input end of which is connected to the output shaft of the motor 300 via a connecting mechanism 400, and the output end of which is connected to the connecting shaft of the torque sensor 200 via the connecting mechanism 400. Before use, the operator transmits the preset torque value to the information processor via the touch panel. The information processor decodes the digital signal transmitted by the touch panel into a signal that can be understood by the controller. Then, the controller stores the set torque value according to the corresponding signal. During operation, the controller sends a control signal to the motor driver according to the preset torque value. The motor driver drives the motor 300 to rotate, and the motor 300 drives the output shaft to rotate through the reducer. The torque sensor 200 detects the torque value of the output shaft in real time and transmits the detection signal to the signal processor. The signal processor transmits the processed signal to the controller. The controller compares the received signal with the preset torque value. When the detected torque value reaches the preset value, the controller sends a stop signal to the motor driver, and the motor 300 stops rotating. The wireless terminal can be a device such as a mobile phone or computer that has the ability to transmit control signals over a long distance. By adding a wireless communication module, remote control and data transmission can be realized. The wireless communication module is electrically connected to the controller. The target torque value can be set and the working status can be monitored in real time through the wireless terminal. Operating procedures and precautions: S1: Connect the output shaft of the electric torque wrench to the workpiece to be tightened; S2: Set the target torque value via the display; S3: Start the electric torque wrench; the controller controls the motor to rotate 300 degrees according to the preset torque value. S4: When the detected torque value reaches the preset value, the controller automatically stops the motor 300 from rotating; S5: Remove the electric torque wrench to complete the operation.

[0018] Compared with the existing technology, the technical effects of this technical solution are as follows: (1) It improves the torque control accuracy of the electric torque wrench, with an error of less than ±1%; (2) It speeds up the response speed of torque control, with a response time of less than 0.1 seconds; (3) It reduces manufacturing costs, simplifies the structure, and makes it easy to maintain; (4) It supports remote control and data transmission, improving the convenience of operation.

[0019] like Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the connecting mechanism 400 includes a sleeve coupling 410. The opposite ends of the torque sensor 200 and the motor 300 are all inserted into the sleeve coupling 410. The upper surface of the sleeve coupling 410 has two insertion holes 411. The inside of the sleeve coupling 410 has a positioning groove 412 that communicates with the insertion holes 411. A bolt 420 is inserted into the inside of the insertion hole 411. The head of the bolt 420 has a cavity 421 that is aligned with the positioning groove 412. A positioning block 430 that is inserted into the positioning groove 412 is slidably connected inside the cavity 421. The center line of the positioning block 430 is perpendicular to the axis of the bolt 420. In use, this invention involves first connecting the two ends of the sleeve coupling 410 to the output shaft of the motor 300 and the connecting shaft of the torque sensor 200, respectively, and aligning the insertion hole 411 with the corresponding thread groove. Then, the bolt 420 is passed through the insertion hole 411 and threaded into the thread groove. Next, a hex wrench is inserted into the adjustment groove on the bolt 420. As the hex wrench extends into the adjustment groove, it simultaneously presses down on the trigger component 440. The trigger component 440 causes the positioning block 430 to retract into the insertion cavity 421. At this point, there is no obstruction on the surface of the bolt head, allowing the operator to tighten the bolt. The bolt 420 is spiraled into the thread groove until it is tightly abutted against the socket 411. At this point, the operator only needs to remove the hex wrench. After the trigger component 440 is unobstructed, it drives the positioning block 430 to quickly insert into the corresponding positioning groove 412, locking the bolt 420 tightly in the socket 411. Even if the thread friction between the bolt 420 and the thread groove is reduced due to vibration or other factors, the positioning groove 412 can prevent the bolt 420 from spiraling loose through the positioning block 430, so that the entire connection mechanism 400 can stably connect the torque sensor 200 and the motor 300 together.

[0020] like Figure 4 and Figure 5 As shown, bolt 420 includes a screw and a screw head. The screw is fixedly connected to the bottom of the screw head. The top of the screw head has a regular hexagonal adjustment groove. The insertion cavity 421 has the side end of the screw head. The upper opening of the insertion cavity 421 communicates with the adjustment groove. The surface of the output shaft of motor 300 and the surface of the connecting shaft of torque sensor 200 are both provided with threaded grooves that match the screw.

[0021] The connecting mechanism 400 also includes a trigger component 440, which includes a guide frame 441 slidably connected to the inside of the cavity 421. The guide frame 441 has a guide bevel 442 on its side end. The guide bevel 442 gradually moves away from the positioning block 430 from bottom to top. A square frame 443 that is fixedly connected to the positioning block 430 is slidably connected inside the guide bevel 442. During production, the side end of the square frame 443 needs to have a notch that can allow the square frame 443 to pass through the guide bevel 442. After the square frame 443 and the guide bevel 442 are connected in place, the notch is closed by existing processes such as welding or injection molding. When the hex wrench presses down on the guide frame 441, the guide frame 441 moves vertically downward along the insertion cavity 421. The guide frame 441 drives the square frame 443 to move away from the positioning groove 412 along the insertion cavity 421 through the guide bevel 442. The square frame 443 drives the positioning block 430 to retract into the insertion cavity 421, so as to achieve the effect of limiting the installation of the contact bolt 420.

[0022] A pressure plate 444 is fixedly connected to the top of the guide frame 441. The pressure plate 444 is located inside the adjustment groove of the bolt head 420. The horizontal cross-sectional diameter of the pressure plate 444 is larger than the horizontal cross-sectional inner diameter of the insertion cavity 421. This can increase the contact area between the hexagonal wrench and the guide frame 441, thereby improving the adjustment stability.

[0023] A spring 445 is provided between the pressure plate 444 and the adjusting groove of the bolt head 420. The spring 445 is always in a compressed state. The spring 445 is sleeved on the outside of the guide frame 441. The spring 445 is a rubber component. When the pressure plate 444 loses its downward pressure, the spring 445 drives the pressure plate 444 to move upward. The pressure plate 444 drives the guide frame 441 to move upward. The guide frame 441 drives the positioning block 430 to move outward of the insertion cavity 421 through the guide bevel 442 and the square frame 443 until the positioning block 430 is inserted into the positioning groove 412 or the positioning block 430 returns to its original state, so as to achieve the effect of self-resetting.

[0024] Limiting grooves 450 are provided between the adjustment grooves of the pressure plate 444 and the head of the bolt 420. The two ends of the spring 445 pass through the interior of the two limiting grooves 450 respectively. This can limit the running trajectory of the spring 445 and reduce the probability of the spring 445 becoming loose or displaced.

[0025] The distance ratio between the box 443 and the inner bottom and top walls of the guide slope 442 is 1 to 5, which ensures that the box 443 has sufficient space to move inside the guide slope 442.

[0026] It should be noted that the controller, signal processor, touch panel, display, motor driver, wireless communication module, and wireless terminal mentioned above are all devices with relatively mature existing technologies. The specific models can be selected according to actual needs. At the same time, the controller, signal processor, touch panel, display, motor driver, wireless communication module, and wireless terminal can be powered by their built-in power supply or by AC power. The specific power supply method should be selected according to the situation, and will not be elaborated here.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A control device for an electric torque wrench, characterized in that, include: The control module (100), torque sensor (200), and motor (300) are provided, wherein the torque sensor (200) and motor (300) are electrically connected to the control module (100) via wires. A connecting mechanism (400) includes a sleeve coupling (410). The opposite ends of the torque sensor (200) and the motor (300) are inserted into the sleeve coupling (410). The upper surface of the sleeve coupling (410) has two insertion holes (411). The inside of the sleeve coupling (410) has a positioning groove (412) that communicates with the insertion holes (411). A bolt (420) is inserted into the insertion hole (411). The head of the bolt (420) has a cavity (421) that is aligned with the positioning groove (412). A positioning block (430) that is inserted into the positioning groove (412) is slidably connected inside the cavity (421). The center line of the positioning block (430) is perpendicular to the axis of the bolt (420).

2. A control device for an electric torque wrench as defined in claim 1, characterized in that: The connecting mechanism (400) further includes a trigger component (440), which includes a guide frame (441) slidably connected inside the cavity (421). The guide frame (441) has a guide bevel (442) on its side end. The guide bevel (442) gradually moves away from the positioning block (430) from bottom to top. A square frame (443) fixedly connected to the positioning block (430) is slidably connected inside the guide bevel (442).

3. A control device for an electric torque wrench as defined in claim 2, characterized in that: A pressure plate (444) is fixedly connected to the top of the guide frame (441). The pressure plate (444) is located inside the adjustment groove of the bolt (420) head. The horizontal cross-sectional diameter of the pressure plate (444) is greater than the horizontal cross-sectional inner diameter of the insertion cavity (421).

4. A control device for an electric torque wrench as defined in claim 3, characterized in that: A spring (445) is provided between the pressure plate (444) and the adjusting groove of the bolt (420) head, and the spring (445) is always in a compressed state.

5. A control device for an electric torque wrench as defined in claim 4, characterized in that: The spring (445) is sleeved on the outside of the guide frame (441), and the spring (445) is a rubber material component.

6. A control device for an electric torque wrench as defined in claim 4, wherein: Limiting grooves (450) are provided between the pressure plate (444) and the adjusting groove of the bolt (420) head, and the two ends of the spring (445) respectively pass through the interior of the two limiting grooves (450).

7. A control device for an electric torque wrench as defined in claim 2, wherein: The distance ratio between the inner bottom wall and the inner top wall of the frame (443) and the guide bevel (442) is one to five.

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