Nut screwing-in device

Abstract

The utility model relates to the technical field of nut screwing-in, and discloses a nut screwing-in device which comprises an installation frame, a rotary clamping mechanism and a detection mechanism. The rotary clamping mechanism is arranged on the mounting frame, the rotary clamping mechanism comprises at least two clamping arms, an embracing space used for embracing a nut is formed between the at least two clamping arms, and the rotary clamping mechanism is used for clamping or loosening the nut and driving the nut to rotate so as to screw the nut into the screw part of the workpiece; and the detection mechanism is arranged at the output end of the rotary clamping mechanism or on the mounting frame, the detection end of the detection mechanism is opposite to and communicates with the position of the cohesion space, and the detection mechanism is used for detecting the position of the screw part in the cohesion space so as to obtain the depth of the nut screwed into the screw part. The nut screwing-in device provided by the utility model can solve the problem of how to directly detect the screwing-in depth of the nut when the nut is screwed into the workpiece.

Description

Technical Field

[0001] This utility model relates to the field of nut screwing technology, and specifically to a nut screwing device. Background Technology

[0002] With the rapid development of industrial automation technology, nut tightening devices, as key equipment in the assembly process of connecting parts, are widely used in industrial robots, automated production lines, and other automated equipment to achieve rapid and precise nut tightening. These devices greatly improve production efficiency, reduce labor costs, and are an indispensable part of modern manufacturing.

[0003] Traditional nut-screwing devices mainly consist of a nut clamping mechanism and a rotary drive mechanism. During operation, the nut clamping mechanism first holds the nut, then automated equipment such as industrial robots precisely aligns the nut with the screw section of the workpiece. Finally, the rotary drive mechanism rotates the nut, working in conjunction with the automated equipment to screw it onto the screw section of the workpiece. This process automates nut insertion, significantly improving assembly efficiency and consistency.

[0004] However, while automated nut-screwing devices excel in improving production efficiency, they still have significant shortcomings in the precise control and detection of nut insertion depth. In traditional workflows, the nut insertion depth is often measured only after the nut is fully screwed into the workpiece, and this is usually done indirectly. This method typically relies on monitoring the final position of the nut clamping mechanism or rotary drive mechanism, and then using a series of complex calculations to infer the nut insertion depth. The limitation of this indirect detection method is that it depends on the precise coordination and data conversion of multiple links; errors in any link can accumulate and ultimately lead to deviations in the insertion depth detection results. For example, mechanical wear, sensor accuracy limitations, and data transmission errors can all affect the accuracy of the final detection results. Furthermore, indirect detection cannot reflect the dynamic changes during the nut screwing process in real time, making it difficult to detect and correct problems such as excessive or insufficient screwing in, thus affecting assembly quality and product reliability.

[0005] In view of the above problems, it is necessary to develop a nut screwing device that can directly, in real time and accurately detect the nut screwing depth. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] This invention provides a nut screwing device, which can at least solve the technical problem of how to directly detect the screwing depth of the nut while screwing it into the workpiece.

[0008] (II) Technical Solution

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a nut screwing-in device, comprising:

[0010] Mounting rack;

[0011] A rotary clamping mechanism is mounted on a mounting bracket. The rotary clamping mechanism includes at least two clamping arms, and a clamping space is formed between the at least two clamping arms for clamping a nut. The rotary clamping mechanism is used to clamp or release the nut, and to drive the nut to rotate so as to screw the nut into the screw portion of the workpiece.

[0012] The detection mechanism is located at the output end of the rotary clamping mechanism or on the mounting bracket. The detection end of the detection mechanism is opposite to and connected to the clamping space. The detection mechanism is used to detect the position of the screw part in the clamping space in order to obtain the depth of the nut screwed into the screw part.

[0013] Furthermore, the aforementioned rotary clamping mechanism also includes:

[0014] A clamping drive is located on the output end of the rotary drive assembly and is connected to at least two clamping arms in a transmission manner. The clamping drive is used to drive at least two clamping arms to move closer or further apart from each other in order to reduce or expand the clamping space.

[0015] A rotary drive assembly, mounted on a mounting bracket, is used to drive the clamping drive component to rotate, thereby causing the clamping arm and the nut within the clamping space to rotate.

[0016] In a further configuration, the aforementioned rotary drive assembly includes a rotary drive component and a rotating shaft. The rotary drive component is mounted on a mounting bracket and is connected to the rotating shaft via a transmission. The rotary drive component is used to drive the rotating shaft to rotate. The clamping drive component is eccentrically or concentrically connected to the rotating shaft, and the clamping arm is located directly below the rotating shaft, so that the detection end of the detection mechanism is opposite to and connected to the clamping space position.

[0017] Further, the aforementioned clamping arms are provided in two parts, and the rotary clamping mechanism also includes a limiting arm. One end of the limiting arm is fixed to the output end of the rotary drive assembly or the clamping drive component, and the other end extends into the space between the two clamping arms. The limiting arm is used to limit the vertical position of the nut in the clamping space. The width of the end of the limiting arm that extends into the space between the two clamping arms is smaller than the diameter of the nut, and it is provided with a clearance channel that is opposite to and connected to the position of the clamping space.

[0018] Furthermore, the inner side of the aforementioned clamping arm is provided with an arc-shaped clamping recess, and the clamping recesses of each clamping arm form a hugging space. Several vertically extending grooves are provided at intervals on the clamping recess.

[0019] In a further configuration, the aforementioned detection mechanism includes a position sensor, which is located on the output end of the rotary clamping mechanism. The detection end of the position sensor is opposite to and connected to the position of the clamping space. The position sensor is used to detect the position of the screw part within the clamping space.

[0020] Further, the aforementioned detection mechanism includes a position sensor and a probe. The position sensor is mounted on a mounting bracket. The output end of the rotary clamping mechanism is provided with a sliding channel that is opposite to and connected to the position of the clamping space. The probe is hung on the sliding channel of the rotary clamping mechanism and can slide along the sliding channel. The top end of the probe is positioned opposite to the detection end of the position sensor, and the bottom end extends into the clamping space. The position sensor is used to detect the position of the probe.

[0021] When the nut is screwed into the screw section, the screw section abuts against the bottom end of the probe and pushes the probe to slide upward along the sliding channel.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the nut screwing device provided by this utility model has the following advantages:

[0024] The mounting bracket for the nut screwing device provided by this utility model can be installed on existing automated equipment such as industrial robots, automated production lines, or other moving mechanisms that include lifting mechanisms. Thus, when used in conjunction with automated equipment, this nut screwing device can automatically feed nuts and screw them onto the screw portion of the workpiece. When the nut is fed onto the screw portion, the screw portion simultaneously inserts into the threaded hole of the nut. At this time, the detection mechanism can detect the position of the screw portion through the clamping space, and this position is set as the initial position. As the nut is continuously screwed into the screw portion, the screw portion simultaneously and continuously penetrates deeper into the clamping space. Therefore, the depth to which the nut is screwed into the screw portion is the same as the depth to which the screw portion penetrates into the clamping space. During this process, the detection mechanism can detect the real-time position of the screw portion through the clamping space. By calculating the difference between these positions, the depth to which the screw portion penetrates into the clamping space (i.e., the screwing depth of the nut) can be obtained. It can be seen that this nut screwing device can directly, in real-time, and accurately detect the screwing depth of the nut while it is being screwed into the workpiece. Attached Figure Description

[0025] Figure 1 This is a perspective view of the nut screwing device in use in the embodiment;

[0026] Figure 2 This is a partial structural schematic diagram of the nut screwing device in the embodiment.

[0027] Icon labels:

[0028] 1. Mounting bracket;

[0029] 2. Rotary clamping mechanism; 21. Clamping arm; 211. Clamping recess; 212. Groove; 22. Clamping space; 23. Clamping drive component; 24. Rotary drive assembly; 241. Rotary drive component; 242. Rotating shaft; 2421. Sliding channel; 25. Limiting arm; 251. Clearance channel; 26. Power slip ring;

[0030] 3. Detection mechanism; 31. Position sensor; 32. Probe;

[0031] 4. Nuts;

[0032] 5. Workpiece; 51. Screw section. Detailed Implementation

[0033] 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.

[0034] This utility model provides a nut screwing device to solve the problem of how to directly detect the screwing depth of the nut 4 while screwing the nut 4 into the workpiece 5.

[0035] See Figure 1 and Figure 2 As shown, Figure 1 This is a perspective view of the nut screwing device in use in the embodiment. Figure 2 The diagram shows a partial structure of the nut screwing device in the embodiment. The nut screwing device includes a mounting bracket 1, a rotating clamping mechanism 2, and a detection mechanism 3.

[0036] The rotary clamping mechanism 2 is mounted on the mounting bracket 1. The rotary clamping mechanism 2 includes at least two clamping arms 21, and a clamping space 22 is formed between the at least two clamping arms 21 for clamping the nut 4. The rotary clamping mechanism 2 is used to clamp or release the nut 4, and to drive the nut 4 to rotate so as to screw the nut 4 onto the screw portion 51 of the workpiece 5.

[0037] The detection mechanism 3 is mounted on the output end of the rotary clamping mechanism 2 or on the mounting bracket 1. The detection end of the detection mechanism 3 is positioned opposite to and connected to the clamping space 22. The detection mechanism 3 is used to detect the position of the screw portion 51 within the clamping space 22 to obtain the depth to which the nut 4 is screwed into the screw portion 51.

[0038] The mounting bracket 1 of the nut screwing device in the above technical solution can be installed on existing automated equipment such as industrial robots, automated production lines, or other moving mechanisms that include lifting mechanisms. Thus, when used in conjunction with automated equipment, the nut screwing device can automatically feed the nut 4 and screw it onto the screw section 51 of the workpiece 5. When the nut 4 is fed onto the screw section 51, the screw section 51 simultaneously inserts into the threaded hole of the nut 4. At this time, the detection mechanism 3 can detect the position of the screw section 51 through the clamping space 22, and this position is set as the initial position. As the nut 4 continuously screws into the screw section 51, the screw section 51 simultaneously and continuously penetrates deeper into the clamping space 22. Therefore, the depth to which the nut 4 is screwed into the screw section 51 is the same as the depth to which the screw section 51 penetrates the clamping space 22. During this process, the detection mechanism 3 can detect the real-time position of the screw section 51 through the clamping space 22. By calculating the difference between these positions, the depth to which the screw section 51 penetrates the clamping space 22 (i.e., the screwing depth of the nut 4) can be obtained. It can be seen that the nut screwing device can directly, in real time and accurately detect the screwing depth of the nut 4 while the nut 4 is screwed into the workpiece 5.

[0039] See Figure 1 and Figure 2 As shown, based on the above embodiment, the rotary clamping mechanism 2 further includes a clamping drive member 23 and a rotary drive assembly 24. The clamping drive member 23 is mounted on the output end of the rotary drive assembly 24 by means of screwing or welding, and is connected to at least two clamping arms 21 in a transmission manner. The clamping drive member 23 is used to drive at least two clamping arms 21 to move closer or further apart from each other, so as to reduce or expand the clamping space 22. The rotary drive assembly 24 is mounted on the mounting bracket 1 by means of screwing or welding. The rotary drive assembly 24 is used to drive the clamping drive member 23 to rotate, so as to drive the clamping arms 21 and the nut 4 in the clamping space 22 to rotate. In this way, the rotary clamping mechanism 2 can realize the rotation of the nut 4 by the cooperation of the clamping arms 21, the clamping drive member 23 and the rotary drive assembly 24, so as to screw the nut 4 onto the screw part 51 of the workpiece 5.

[0040] The aforementioned clamping drive component 23 can use existing clamping cylinders, hydraulic cylinders, or electric cylinders, with its output end connected to the clamping arm 21 via screwing or welding. Furthermore, the clamping drive component 23 can be powered by an existing power slip ring 26, which is mounted on the output end of the rotary drive assembly 24 and connected to the clamping drive component 23. The power provided can be compressed air, liquid, or electricity. Thus, by providing power to the clamping drive component 23 via the power slip ring 26, the power source line of the clamping drive component 23 is no longer affected by the rotation of the shaft 242, allowing the clamping drive component 23 to maintain clamping force and ensuring the smooth screwing of the nut 4.

[0041] See Figure 1 and Figure 2 As shown, in one embodiment of the rotary drive assembly 24, the rotary drive assembly 24 includes a rotary drive component 241 and a rotating shaft 242. The rotary drive component 241 is mounted on the mounting bracket 1 by means of screwing or welding, and the rotary drive component 241 and the rotating shaft 242 are connected by means of synchronous belt, belt, or gear, etc., and the rotary drive component 241 is used to drive the rotating shaft 242 to rotate. The clamping drive component 23 is eccentrically or concentrically connected to the rotating shaft 242 by means of screwing or welding, and the clamping arm 21 is located directly below the rotating shaft 242, so that the detection end of the detection mechanism 3 is opposite to and communicates with the clamping space 22. Thus, when the rotary drive 241 is started, the drive shaft 242 rotates, which in turn drives the clamping drive 23 and the clamping arm 21 to rotate around the axis of the shaft 242, thereby causing the nut 4 to be screwed into the screw part 51. If the detection mechanism 3 is coaxially mounted on the clamping drive 23, the clamping drive 23 can be concentrically connected to the shaft 242. Otherwise, the clamping drive 23 needs to be eccentrically set to make way for the detection mechanism 3, so that the detection end of the detection mechanism 3 can detect the position of the screw part 51 in the clamping space 22, thereby obtaining the depth of the nut 4 screwed into the screw part 51.

[0042] The aforementioned rotary drive 241 can use existing rotary motion components such as electric motors, pneumatic motors, or hydraulic motors.

[0043] If the aforementioned testing mechanism 3 is installed on the mounting bracket 1, the aforementioned rotating shaft 242 needs to be hollow to provide space for the testing mechanism 3 so that the testing end of the testing mechanism 3 can be opposite to and connected to the position of the clamping space 22.

[0044] See Figure 1 and Figure 2 As shown, in the embodiment where the rotary clamping mechanism 2 further includes a clamping drive member 23 and a rotary drive assembly 24, there are two clamping arms 21, and the rotary clamping mechanism 2 also includes a limiting arm 25. One end of the limiting arm 25 is fixed to the output end of the rotary drive assembly 24 or the clamping drive member 23 by means of screwing or welding, and the other end extends between the two clamping arms 21. The limiting arm 25 is used to limit the vertical position of the nut 4 within the clamping space 22. The width of the end of the limiting arm 25 extending between the two clamping arms 21 is smaller than the diameter of the nut 4 to avoid interference with the clamping of the nut 4 by the two clamping arms 21. The limiting arm 25 has a clearance channel 251 that is opposite to and communicates with the clamping space 22 so that the detection mechanism 3 can detect the position of the screw portion 51 within the clamping space 22. Thus, by limiting the vertical position of the nut 4 within the clamping space 22 by the limiting arm 25, the accuracy of the detection result of the detection mechanism 3 can be improved.

[0045] See Figure 1 and Figure 2As shown, in one embodiment of the clamping arm 21, the inner side of the clamping arm 21 has an arc-shaped clamping recess 211, and the clamping recesses 211 of each clamping arm 21 form the aforementioned enclosing space 22. A plurality of grooves 212 are spaced apart on the clamping recesses 211, and the grooves 212 extend vertically. Thus, the clamping arm 21 can contact the nut 4 surface through the clamping recesses 211, increasing the contact area between them, thereby increasing the friction between the clamping arm 21 and the nut 4. Furthermore, the presence of grooves 212 on the clamping recesses 211 improves the surface roughness of the clamping recesses 211, further increasing the friction between the clamping arm 21 and the nut 4. This increased friction between the clamping arm 21 and the nut 4 facilitates easy rotation of the nut 4 by the rotating clamping mechanism 2, allowing the nut 4 to be screwed onto the screw portion 51 of the workpiece 5.

[0046] The shape of the aforementioned clamping recess 211 can be the same as or similar to the shape of the nut 4 being screwed in, which facilitates stable clamping of the nut 4. The aforementioned clamping recess 211 can be selected to have grooves 212 provided, as well as the number and size of the grooves 212 provided, according to actual production needs.

[0047] In one embodiment of the detection mechanism 3, the detection mechanism 3 includes a position sensor 31. The position sensor 31 is mounted on the output end of the rotary clamping mechanism 2 by means of screwing or bonding. The detection end of the position sensor 31 is positioned opposite to and connected to the clamping space 22. The position sensor 31 is used to detect the position of the screw portion 51 within the clamping space 22. Thus, as the nut 4 is screwed into the screw portion 51, the screw portion 51 simultaneously and continuously penetrates deeper into the clamping space 22. The position sensor 31 can detect the position of the screw portion 51 in real time. By calculating the difference between this position and the original position of the screw portion 51, the depth to which the screw portion 51 penetrates into the clamping space 22 (i.e., the screwing depth of the nut 4) can be obtained. It can be seen that the nut screwing device, through this detection mechanism 3, can also directly, in real time, and accurately detect the screwing depth of the nut 4 while the nut 4 is screwed into the workpiece 5.

[0048] The aforementioned position sensor 31 can use a non-contact sensor such as a laser to directly detect the position of the screw portion 51 within the clamping space 22. Alternatively, the aforementioned position sensor 31 can use a contact sensor with a built-in retractable probe, which directly detects the position of the screw portion 51 by placing the retractable probe of the sensor against the screw portion 51.

[0049] See Figure 1 and Figure 2As shown, in another embodiment of the detection mechanism 3, the detection mechanism 3 includes a position sensor 31 and a probe 32. The position sensor 31 is mounted on the mounting bracket 1 by means of screwing or bonding. The output end of the rotary clamping mechanism 2 has a sliding channel 2421, which is opposite to and communicates with the clamping space 22. The probe 32 is attached to the sliding channel 2421 of the rotary clamping mechanism 2 and can slide along the sliding channel 2421. The top end of the probe 32 is positioned opposite to the detection end of the position sensor 31, and the bottom end of the probe 32 extends into the clamping space 22 to abut against the screw portion 51. The position sensor 31 is used to detect the position of the probe 32. When the nut 4 is screwed into the screw portion 51, the screw portion 51 abuts against the bottom end of the probe 32 and pushes the probe 32 to slide upward along the sliding channel 2421. Thus, as the nut 4 is screwed into the screw section 51, the screw section 51 simultaneously and continuously penetrates deeper into the engagement space 22, pushing the probe 32 upward along the sliding channel 2421. The position sensor 31 can detect the position of the probe 32 in real time. By calculating the difference between this position and the original position of the probe 32, the depth to which the screw section 51 penetrates the engagement space 22 (i.e., the screwing depth of the nut 4) can be obtained. It can be seen that the nut screwing device, through the detection mechanism 3, can directly, in real time, and accurately detect the screwing depth of the nut 4 while it is screwed into the workpiece 5.

[0050] The two implementation methods of the above-mentioned detection mechanism 3 can be selected according to actual production needs. The main difference between the two implementation methods is that the latter implementation method adds a probe 32 as an auxiliary mechanical structure to ensure the normal operation of the sensor. However, if the nut 4 is large, the position sensor 31 can directly detect the position of the screw part 51 in the clamping space 22, or can directly detect the position of the nut 4, then the probe 32 is not needed.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nut screwing device, characterized in that, include: Mounting rack; A rotary clamping mechanism is provided on the mounting bracket. The rotary clamping mechanism includes at least two clamping arms, and a clamping space is formed between the at least two clamping arms for clamping the nut. The rotary clamping mechanism is used to clamp or release the nut, and to drive the nut to rotate so as to screw the nut into the screw portion of the workpiece. A detection mechanism is provided at the output end of the rotary clamping mechanism or on the mounting bracket. The detection end of the detection mechanism is opposite to and connected to the clamping space. The detection mechanism is used to detect the position of the screw portion in the clamping space to obtain the depth to which the nut is screwed into the screw portion.

2. The nut screwing device according to claim 1, characterized in that, The rotary clamping mechanism further includes: A clamping drive is provided on the output end of the rotary drive assembly and is connected to at least two clamping arms in a transmission manner. The clamping drive is used to drive at least two clamping arms to move closer to each other or further away from each other, so as to reduce or expand the clamping space. A rotary drive assembly is mounted on the mounting bracket and is used to drive the clamping drive component to rotate, thereby causing the clamping arm and the nut in the clamping space to rotate.

3. The nut screwing device according to claim 2, characterized in that, The rotary drive assembly includes a rotary drive component and a rotating shaft. The rotary drive component is mounted on the mounting bracket and is connected to the rotating shaft in a transmission manner. The rotary drive component is used to drive the rotating shaft to rotate. The clamping drive component is eccentrically or concentrically connected to the rotating shaft, and the clamping arm is located directly below the rotating shaft, so that the detection end of the detection mechanism is opposite to and connected to the clamping space position.

4. The nut screwing device according to claim 2, characterized in that, The clamping arms are provided in two. The rotary clamping mechanism also includes a limiting arm. One end of the limiting arm is fixed to the output end of the rotary drive assembly or the clamping drive component, and the other end extends between the two clamping arms. The limiting arm is used to limit the vertical position of the nut in the clamping space. The width of the end of the limiting arm that extends between the two clamping arms is smaller than the diameter of the nut, and it is provided with a clearance channel that is opposite to and communicates with the position of the clamping space.

5. The nut screwing device according to any one of claims 1-4, characterized in that, The inner side of the clamping arm is provided with an arc-shaped clamping recess, and the clamping recesses of each clamping arm form the enclosing space. The clamping recess is provided with a number of grooves extending vertically at intervals.

6. The nut screwing device according to any one of claims 1-4, characterized in that, The detection mechanism includes a position sensor, which is located on the output end of the rotary clamping mechanism. The detection end of the position sensor is opposite to and connected to the clamping space. The position sensor is used to detect the position of the screw portion within the clamping space.

7. The nut screwing device according to any one of claims 1-4, characterized in that, The detection mechanism includes a position sensor and a probe. The position sensor is mounted on the mounting bracket. The output end of the rotary clamping mechanism has a sliding channel that is opposite to and communicates with the clamping space. The probe is hung on the sliding channel of the rotary clamping mechanism and can slide along the sliding channel. The top end of the probe is positioned opposite to the detection end of the position sensor, and the bottom end extends into the clamping space. The position sensor is used to detect the position of the probe. When the nut is screwed into the screw section, the screw section abuts against the bottom end of the probe and pushes the probe to slide upward along the sliding channel.

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