A sensor mounting structure for sheet metal part welding detection

Abstract

The utility model discloses a kind of inductor mounting structures for sheet metal part upper part welding detection, it is related to sheet metal part welding detection technical field, including connecting plate and support plate, connecting plate is L type, connecting plate and support plate are fixedly connected by threaded fastener, connecting plate is connected with driving mechanism by threaded fastener;The top of support plate is provided with the mounting slot of through, annular protective sleeve is movably arranged in mounting slot, protective sleeve and mounting slot gap cooperation, the outer wall of protective sleeve is equipped with external thread, the inner wall of protective sleeve is equipped with internal thread, two limit nuts are screw-connected to the outside of protective sleeve, two limit nuts are respectively with the upper and lower surface of support plate top abutting abutting tightly.The utility model has good protection effect to inductor, inductor detection signal is not easy to shield, and protection effect and detection accuracy are considered, and installation stability is higher, and it is not easy to appear loosening and shaking situation and affect detection work, and practicality is higher.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal welding inspection technology, and in particular to a sensor mounting structure for welding inspection of parts on sheet metal parts. Background Technology

[0002] In the manufacturing and assembly of sheet metal parts, especially in precision manufacturing scenarios such as automotive components and structural parts for construction machinery, sheet metal parts often require the assembly of bolts, nuts, and various lap-welded small parts through welding or bolt connections. The assembly quality of these parts directly determines the structural strength, connection reliability, and operational safety of the final product. For example, if bolts on automotive chassis sheet metal parts are missing or misaligned, it may lead to loose chassis connections and cause driving safety hazards; if nuts on construction machinery cab sheet metal parts are missing welds, it will affect the connection stability between the cab and the machine body, increasing the risk of failure during operation. Therefore, in the welding process of parts factories, accurate detection of problems such as "missed welding, missing installation, and incorrect installation" of bolts, nuts, and other parts on sheet metal parts is a key link in ensuring production quality and preventing unqualified products from flowing into downstream processes.

[0003] With the improvement of automation level in manufacturing, inductive sensors (such as the inductive sensor with model number BI8U-MT18-AP6X-H1141(L)) are now widely used in the industry as core detection components to build automated detection systems on welding fixtures. The working principle is as follows: the inductive sensor is integrated into a preset position on the welding fixture. The sensor head can emit an inductive signal of a specific frequency. When the signal acts on the target part (bolt, nut, etc.) on the sheet metal, a specific reflected signal will be generated due to the material and shape characteristics of the part. After the reflected signal is received by the sensor, it is converted into an electrical signal and transmitted to the PLC (Programmable Logic Controller) terminal. The PLC analyzes parameters such as the signal strength and frequency to determine whether the target part exists (i.e., whether it is missing from the installation), whether the installation position meets the preset standard (i.e., whether the installation is incorrect), and whether the welding is firm (indirectly determining the situation of missing welds). If the test result is qualified, the PLC will send an allow signal to the robot or automated welding equipment, and the equipment can then start the subsequent welding or assembly process. If the test result is unqualified, the system will trigger an alarm mechanism to suspend the production process, so that staff can promptly investigate and handle the problem, thereby greatly improving the efficiency and accuracy of the test and avoiding the subjective errors and inefficiencies of manual testing.

[0004] However, in practical production applications, inductive sensors face multiple harsh environmental challenges, making them highly susceptible to damage and severely impacting the stability of the detection system and production continuity. Specific problems include:

[0005] 1. Risk of impact from external mechanical structure movement: Automated equipment in the welding workshop (such as robotic arms, transfer mechanisms, clamp opening and closing components, etc.) needs to frequently perform high-precision movements to complete operations such as gripping, positioning, and welding of sheet metal parts. Since inductive sensors usually need to be installed close to the welding station to ensure the effectiveness of the detection signal, their installation position is often in the vicinity of the mechanical structure's movement trajectory. Under the circumstances of equipment debugging errors, fluctuations in motion parameters, or sudden failures (such as robotic arm positioning deviation), the moving mechanical structure is very likely to collide directly with the sensor, causing the sensor shell to crack, the internal sensing element to shift or be damaged, and thus losing the detection function.

[0006] 2. Slag Collision and High-Temperature Damage: During the welding process, arc welding generates a large amount of high-temperature slag (temperatures can reach hundreds to thousands of degrees Celsius). This slag will scatter everywhere in the form of spatter, and some of the slag will directly impact the head or shell of the inductive sensor. On the one hand, the high-temperature slag may burn the protective coating on the sensor surface and damage its insulation performance; on the other hand, although the impact force of the slag is small, long-term accumulation will cause wear and deformation of the sensing surface of the sensor head, affecting the accuracy of signal transmission and reception, and even causing the internal circuit of the sensor to burn out due to high-temperature conduction.

[0007] Limitations of existing protection solutions: Currently, the industry mostly uses simple plastic sleeves or metal baffles to protect sensors. However, plastic sleeves have low strength and cannot withstand mechanical impacts, and are easily melted by high-temperature welding slag. Although metal baffles can block some welding slag and impacts, they will block the signal path of the sensor head, resulting in signal attenuation or distortion, affecting detection accuracy, and cannot meet the requirements of inductive sensors for unobstructed signal transmission.

[0008] In summary, the inductive sensors currently used in sheet metal welding inspection face a high risk of damage due to the lack of efficient protective structures adapted to their detection characteristics and operating environment. This not only increases the company's equipment procurement and maintenance costs (due to the high frequency of sensor replacement), but also poses a risk of production stoppage or the release of defective products due to sensor damage. Therefore, there is an urgent need for a sensor mounting structure for welding inspection of parts on sheet metal to solve the above-mentioned technical problems. Utility Model Content

[0009] This utility model discloses a sensor mounting structure for welding inspection of parts on sheet metal parts. It is equipped with a protective sleeve, and after the sensor body is installed and fixed, the top sensing area of ​​the sensor body is flush with the top opening of the protective sleeve. The protective sleeve is made of hard alloy material, which can effectively block the direct impact of external mechanical structures and the damage from the splashing of high temperature welding slag, forming all-round protection for the sensor body. At the same time, since the sensing area of ​​the sensor body is flush with the top opening of the protective sleeve, it will not block the signal transmission and reception path of the sensor, ensuring the integrity and accuracy of the detection signal. It takes into account both the protection effect and the detection accuracy, and has high practicality.

[0010] The dual-limiting structure greatly ensures installation stability. During installation, the protective sleeve is firmly fixed to the upper and lower surfaces of the bracket plate by two limiting nuts. At the same time, the abutment knob abuts against the outer wall of the protective sleeve, forming a multi-dimensional fixation. The sensor body and the protective sleeve are tightly screwed together by threads. When the overall structure is subjected to external vibration or impact, the connection of each component is tight and it is not easy to loosen or shake. This ensures that the sensor is always in the preset detection position, ensuring the stability and reliability of the detection. It is highly practical and solves the problems in the background technology.

[0011] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0012] This utility model discloses a sensor mounting structure for welding detection of parts on sheet metal parts, including a connecting plate and a bracket plate. The connecting plate is L-shaped, and the connecting plate and the bracket plate are fixedly connected by threaded fasteners. The connecting plate is externally connected to a driving mechanism by threaded fasteners.

[0013] The top of the support plate has a through mounting groove, and an annular protective sleeve is movably inserted through the mounting groove. The protective sleeve is clearance-fitted with the mounting groove. The outer wall of the protective sleeve has external threads, and the inner wall of the protective sleeve has internal threads. Two limiting nuts are screwed onto the outside of the protective sleeve, and the two limiting nuts abut against the upper and lower surfaces of the top of the support plate, respectively. A sensor body is screwed onto the inside of the protective sleeve. The outside of the sensor body has external threads, and the sensing area at the top of the sensor body is flush with the top opening of the protective sleeve.

[0014] Furthermore, the connecting plate has a first connecting hole and a second connecting hole in the shape of strips at both ends, and a first bolt is provided at the first connecting hole, with a driving mechanism externally connected to the first bolt.

[0015] Furthermore, a second bolt is provided at the second connecting hole, and two first threaded holes are opened at the bottom end of the bracket plate, and the second bolt is screwed into the first threaded holes.

[0016] Furthermore, the connecting plate and the bracket plate are made of hard alloy material, and the protective sleeve is also made of hard alloy material.

[0017] Furthermore, the top outer wall of the bracket plate is provided with a plurality of second threaded holes, the second threaded holes are connected to the inside of the mounting groove, and an abutment knob is screwed into the second threaded hole. One end of the abutment knob passes through the second threaded hole and abuts against the outer wall of the protective sleeve.

[0018] Furthermore, an anti-slip pad layer is fixedly connected to one end of the abutting knob that abuts against the outer wall of the protective sleeve. The anti-slip pad layer is made of rubber material.

[0019] The present invention has the following advantages over the prior art:

[0020] 1. This technical solution features a protective sleeve, with the sensor body's top sensing area flush with the top opening of the protective sleeve after installation and fixation. The protective sleeve is made of hard alloy material, which can effectively block direct impacts from external mechanical structures and damage from high-temperature welding slag splashes, providing all-round protection for the sensor body. At the same time, since the sensor body's sensing area is flush with the top opening of the protective sleeve, it will not obstruct the sensor's signal transmission and reception path, ensuring the integrity and accuracy of the detection signal. It balances protection effect and detection accuracy, making it highly practical.

[0021] 2. This technical solution greatly ensures installation stability through a double limiting structure. During installation, the protective sleeve is firmly fixed to the upper and lower surfaces of the bracket plate by two limiting nuts. At the same time, the abutment knob abuts against the outer wall of the protective sleeve, forming a multi-dimensional fixation. The sensor body and the protective sleeve are tightly screwed together by threads. When the overall structure is subjected to external vibration or impact, the connection of each component is tight and it is not easy to loosen or shake. This ensures that the sensor is always in the preset detection position, ensuring the stability and reliability of the detection and making it highly practical. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0025] Figure 3This is a schematic diagram of the exploded structure of the sensor body of this utility model.

[0026] Figure 4 A schematic diagram of the sensor body of this utility model from another perspective of the explosion.

[0027] Figure 5 This is a schematic diagram of the contact knob structure of this utility model.

[0028] In the diagram: 1. Connecting plate; 2. Support plate; 3. Mounting groove; 4. Protective sleeve; 5. Limiting nut; 6. Sensor body; 7. First connecting hole; 8. Second connecting hole; 9. First bolt; 10. Second bolt; 11. First threaded hole; 12. Second threaded hole; 13. Abutment knob; 14. Anti-slip pad. Detailed Implementation

[0029] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "surface", "side", "gap", "peripheral", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Reference Figures 1-5 A sensor mounting structure for welding detection of parts on sheet metal parts includes a connecting plate 1 and a bracket plate 2. The connecting plate 1 is L-shaped and the connecting plate 1 and the bracket plate 2 are fixedly connected by threaded fasteners. The connecting plate 1 is externally connected to a drive mechanism by threaded fasteners.

[0032] The top of the support plate 2 has a through mounting groove 3, and an annular protective sleeve 4 is movably inserted through the mounting groove 3. The protective sleeve 4 is clearance-fitted with the mounting groove 3. The outer wall of the protective sleeve 4 has external threads, and the inner wall of the protective sleeve 4 has internal threads. Two limit nuts 5 are screwed onto the outside of the protective sleeve 4. The two limit nuts 5 abut against the upper and lower surfaces of the top of the support plate 2 respectively. The sensor body 6 is screwed onto the inside of the protective sleeve 4. The outside of the sensor body 6 has external threads, and the sensing area at the top of the sensor body 6 is flush with the top opening of the protective sleeve 4.

[0033] The connecting plate 1 has a first connecting hole 7 and a second connecting hole 8 at both ends. A first bolt 9 is provided at the first connecting hole 7, and a driving mechanism is connected to the first bolt 9. A second bolt 10 is provided at the second connecting hole 8. Two first threaded holes 11 are provided at the bottom end of the bracket plate 2, and the second bolt 10 is screwed into the first threaded holes 11. The connecting plate 1 and the bracket plate 2 are made of hard alloy material, and the protective sleeve 4 is also made of hard alloy material.

[0034] The top outer wall of the bracket plate 2 is provided with multiple second threaded holes 12, which are connected to the inside of the mounting groove 3. A contact knob 13 is screwed into the second threaded hole 12. One end of the contact knob 13 passes through the second threaded hole 12 and abuts against the outer wall of the protective sleeve 4. An anti-slip pad 14 is fixedly connected to the end of the contact knob 13 that abuts against the outer wall of the protective sleeve 4. The anti-slip pad 14 is made of rubber material.

[0035] In the specific implementation process, during installation, the bottom end of the bracket plate 2 is attached to one side of the connecting plate 1, aligning the two first threaded holes 11 at the bottom end of the bracket plate 2 with the second connecting holes 8 of the connecting plate 1. Then, the second bolt 10 is passed through the second connecting hole 8 and screwed into the first threaded hole 11. After tightening, the connecting plate 1 and the bracket plate 2 are fixedly connected. Since the second connecting hole 8 is a strip structure, the position of the bracket plate 2 relative to the connecting plate 1 can be finely adjusted during installation to ensure that the detection direction of the sensor body 6 meets the preset requirements. Then, the sensor body 6 is screwed into the bottom opening of the protective sleeve 4 and gradually tightened through the threaded engagement until the top sensing area of ​​the sensor body 6 is flush with the top opening of the protective sleeve 4. In this design, the top of the protective sleeve 4 is flush with the sensing area of ​​the sensor, which not only utilizes the ring structure of the protective sleeve 4 to form an outer protection for the sensor, but also avoids blocking the transmission and reception path of the sensing signal, ensuring the integrity of the detection signal.

[0036] At this point, one of the limiting nuts 5 is screwed on from top to bottom to the outside of the protective sleeve 4, so that it is located at the lower end of the protective sleeve 4. Then, the protective sleeve 4 is passed through the mounting groove 3 at the top of the bracket plate 2 from bottom to top. Then, the other limiting nut 5 is screwed on from top to bottom to the outside of the protective sleeve 4. According to the actual position requirements, the two limiting nuts 5 are tightened respectively so that they abut against the upper and lower surfaces of the bracket plate 2, thereby fixing the protective sleeve 4 on the bracket plate 2.

[0037] To further enhance stability, the top outer wall of the bracket plate 2 is provided with a second threaded hole 12 that communicates with the mounting groove 3. The abutment knob 13 is screwed into the second threaded hole 12, so that one end of it passes through the threaded hole and abuts against the outer wall of the protective sleeve 4. The axial fixation of the limit nut 5 and the radial limit of the abutment knob 13 form a double fixing structure to prevent the protective sleeve 4 from loosening or rotating during the testing process.

[0038] Finally, the connecting plate 1 is connected to the external driving mechanism (such as a robotic arm, cylinder, translation module, etc.) through the first connecting hole 7. The first bolt 9 is passed through the strip-shaped first connecting hole 7 and screwed to the connecting end of the driving mechanism. After tightening, the overall structure is fixed to the driving mechanism. The strip-shaped first connecting hole 7 can be used to finely adjust the position of the body structure relative to the driving mechanism during installation to ensure that the initial posture of the sensor body 6 meets the detection trajectory requirements.

[0039] When the equipment starts testing, the external drive mechanism (such as a robotic arm, cylinder, translation module, etc.) drives the connecting plate 1, the support plate 2 and the assembled sensor body 6 to move as a whole according to the preset program. This causes the sensing area at the top of the sensor body 6 to gradually approach the welding point of the sheet metal part (such as the welding position of bolts and nuts). At this time, the sensor body 6 emits an inductive signal. The signal passes through the opening at the top of the protective sleeve 4 and acts on the target part. The reflected signal is received by the sensor and converted into an electrical signal, which is transmitted to the PLC terminal. The PLC analyzes the signal parameters to determine whether the part is missing, misaligned or welded. During this process, the protective sleeve 4 always protects the sensor body 6, blocking external mechanical impacts and high-temperature welding slag splashes. The double fixing structure ensures that the sensor body 6 does not loosen or shake during movement and testing, and always maintains the relative positional accuracy with the welding point, ensuring the stability and accuracy of the detection signal. After the test is completed, the drive mechanism drives the overall structure to reset, waiting for the next test command.

[0040] The connecting plate 1 and the bracket plate 2 are made of hard alloy material to ensure that the connecting plate 1 and the bracket plate 2 have high rigidity and are not easily deformed or damaged. The protective sleeve 4 is also made of hard alloy material to ensure that the protective sleeve 4 has high rigidity and is not easily deformed or damaged, while also having a good protective effect.

[0041] Among them, the anti-slip pad layer 14 can enhance the friction between the abutting knob 13 and the outer wall of the protective sleeve 4, improve the abutting and fixing effect, and at the same time reduce the wear between the abutting knob 13 and the protective sleeve 4, and extend its overall service life.

[0042] The drive mechanism can be a standard cylinder of model SC63-50, with an M12 internal thread interface at the end of its piston rod; the first bolt 9 is a hexagonal head bolt with a nominal diameter of 12mm and a length of 20mm. The first bolt 9 passes through the first connecting hole 7 and is screwed into the M12 internal thread interface of the cylinder piston rod; when the connecting plate 1 is connected to the cylinder, the parallelism between the side of the connecting plate 1 and the cylinder guide rail needs to be calibrated with a dial indicator. The parallelism error is ≤0.1mm / m. After calibration, the first bolt 9 is tightened to complete the fixation.

[0043] The inner diameter of the mounting groove 3 is φ20H7 (upper deviation +0.021mm, lower deviation 0mm), and the outer diameter of the protective sleeve 4 is φ20g6 (upper deviation -0.007mm, lower deviation -0.020mm). The single-sided gap after the two are fitted together is 0.007-0.021mm, which ensures that the protective sleeve 4 can be assembled smoothly and avoids radial wobbling.

[0044] The anti-slip pad 14 is a circular rubber pad with a diameter of 8mm and a thickness of 2mm (made of nitrile rubber, hardness 70±5ShoreA). The anti-slip pad 14 is bonded and fixed to the end of the abutment knob 13 with epoxy resin adhesive (model E-44). After bonding, it needs to be cured at room temperature for 24 hours to ensure that the bonding strength is ≥5MP.

[0045] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An inductor mounting structure for sheet metal part welding inspection, comprising a connecting plate (1) and a bracket plate (2), characterized in that: The connecting plate (1) is L-shaped, and the connecting plate (1) and the bracket plate (2) are fixedly connected by threaded fasteners. The connecting plate (1) is externally connected to a driving mechanism by threaded fasteners. The top of the support plate (2) is provided with a through mounting groove (3), and an annular protective sleeve (4) is movably provided in the mounting groove (3). The protective sleeve (4) is clearance-fitted with the mounting groove (3). The outer wall of the protective sleeve (4) is provided with external threads, and the inner wall of the protective sleeve (4) is provided with internal threads. Two limiting nuts (5) are screwed onto the outside of the protective sleeve (4). The two limiting nuts (5) abut against the upper and lower surfaces of the top of the support plate (2) respectively. A sensor body (6) is screwed onto the inside of the protective sleeve (4). The outside of the sensor body (6) is provided with external threads. The sensing area at the top of the sensor body (6) is flush with the top opening of the protective sleeve (4).

2. The sensor mounting structure for detecting welding of a part on a sheet metal member according to claim 1, characterized in that: The connecting plate (1) has a strip-shaped first connecting hole (7) and a second connecting hole (8) at both ends. A first bolt (9) is provided at the first connecting hole (7), and a driving mechanism is connected to the first bolt (9).

3. The sensor mounting structure for detecting welding of a part on a sheet metal member according to claim 2, characterized in that: A second bolt (10) is provided at the second connecting hole (8), and two first threaded holes (11) are opened at the bottom end of the bracket plate (2). The second bolt (10) is screwed into the first threaded holes (11).

4. The sensor mounting structure for detecting welding of a part on a sheet metal member according to claim 1, characterized in that: The connecting plate (1) and the bracket plate (2) are made of hard alloy material, and the protective sleeve (4) is also made of hard alloy material.

5. The inductor mounting structure for detecting welding of a part on a sheet metal member according to claim 2, characterized in that: The top outer wall of the bracket plate (2) is provided with a plurality of second threaded holes (12). The second threaded holes (12) are connected to the inside of the mounting groove (3). Abutment knob (13) is screwed into the second threaded hole (12). One end of the abutment knob (13) passes through the second threaded hole (12) and abuts against the outer wall of the protective sleeve (4).

6. The inductor mounting structure for detecting welding of a part on a sheet metal member according to claim 5, characterized in that: An anti-slip pad (14) is fixedly connected to one end of the abutting knob (13) that abuts against the outer wall of the protective sleeve (4). The anti-slip pad (14) is made of rubber material.

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