Leakage-proof positioning device

Abstract

The utility model relates to the technical field of automobile part machining, in particular to a leakage-proof positioning device. The leakage-proof positioning device is used for welding a vehicle body assembly and comprises a positioning seat, a positioning pin, an elastic piece and a photoelectric sensor, and the positioning seat is provided with a first mounting hole; the positioning pin is arranged in the first mounting hole and used for positioning the first sub-component and the welding nut, the positioning pin comprises a first part, a second part and a third part which are sequentially connected, the outer diameter of the first part is smaller than or equal to the inner diameter of the welding nut, the outer diameter of the second part is larger than the inner diameter of the welding nut, and the outer diameter of the second part is smaller than or equal to the inner diameter of the first hole; the elastic piece is arranged in the first mounting hole and abuts against the end, away from the second part, of the third part so as to support the positioning pin. The photoelectric sensor is arranged on the positioning seat and is suitable for sending a signal to the control unit after detecting that the positioning pin is pressed by the welding nut to move. The purpose of reducing omission of the sub-components and the welding nuts on the vehicle body sub-assembly is achieved.

Description

Technical Field

[0001] This application relates to the field of automotive parts processing technology, and in particular to a leak-proof positioning device. Background Technology

[0002] With the development of the automotive industry and its increasing automation, welding nuts are a crucial connection method for achieving functional connections in automobiles. For sub-components requiring a small number of welding nuts, manual welding is often employed. However, issues such as unskilled personnel, rapid personnel turnover, and improper work techniques can lead to missed welds. Furthermore, when assembling sub-components into welded assemblies, the sub-components are often placed manually on positioning devices, which is insufficient to effectively prevent leaks of parts and nuts. Missing nuts or sub-components on the vehicle body assembly can cause production line shutdowns, increasing production costs and reducing efficiency. Utility Model Content

[0003] This application provides a leak-proof positioning device, which achieves the purpose of reducing the omission of sub-components and welded nuts on the vehicle body sub-assemblies.

[0004] To achieve the above objectives, the main technical solutions adopted in this application include:

[0005] This application provides a leak-proof positioning device for welding a vehicle body assembly. The vehicle body assembly includes a first sub-component and a welding nut. The first sub-component has a first hole. The welding nut is adapted to be welded to the first sub-component and is disposed around the first hole. The leak-proof positioning device includes a positioning seat, a positioning pin, an elastic element, and a photoelectric sensor. The positioning seat has a first mounting hole. The positioning pin is disposed in the first mounting hole and is used to position the first sub-component and the welding nut. The positioning pin includes a first part, a second part, and a third part connected in sequence. The outer diameter of the first part is less than or equal to the inner diameter of the welding nut. The outer diameter of the second part is greater than the inner diameter of the welding nut. The outer diameter of the second part is less than or equal to the inner diameter of the first hole. The elastic element is disposed in the first mounting hole and abuts against the end of the third part away from the second part to support the positioning pin. The photoelectric sensor is disposed on the positioning seat and is adapted to send a signal to a control unit after detecting that the positioning pin is moved by the welding nut.

[0006] The leak-proof positioning device proposed in this application has a first part of the positioning pin that can pass through the welding nut, and a second part with an outer diameter larger than the welding nut. The welding nut can press the positioning pin back into the first mounting hole, allowing the photoelectric sensor to detect the signal of the positioning pin. This indicates that the positioning pin has been displaced, thus indicating that the welding nut and the first sub-component are welded normally and without any omissions, allowing the welding process of the vehicle body assembly to proceed normally. This application only uses one photoelectric sensor, reducing the investment in photoelectric sensors, lowering costs, simplifying the structure of the leak-proof positioning device, and optimizing the welding space of the vehicle body assembly.

[0007] Optionally, the positioning pin further includes a fourth part, which is connected to the third part, and the elastic element is sleeved on the fourth part, the outer diameter of the fourth part being smaller than the outer diameter of the third part.

[0008] In the above scheme, the outer diameter of the fourth part is smaller than that of the third part. When the welding nut and the first sub-component are not placed on the positioning seat, the positioning pin is in the initial position. The distance between the fourth part and the photoelectric sensor is large, and the photoelectric sensor cannot sense the signal of the fourth part, thereby reducing the influence of the fourth part on the detection result of the photoelectric sensor.

[0009] Optionally, the first mounting hole includes a first segment and a second segment connected together, the inner diameter of the first segment being larger than the inner diameter of the second segment to form a first stepped surface; the leak-proof positioning device also includes a first wear-resistant sleeve, the first wear-resistant sleeve being disposed on the first segment and abutting against the first stepped surface, and the third part being fitted inside the first wear-resistant sleeve and movable relative to the first wear-resistant sleeve.

[0010] In the above scheme, the third part is fitted inside the first wear-resistant sleeve to reduce the wear generated by the third part when the positioning pin moves, thereby improving the detection accuracy of the photoelectric sensor.

[0011] Optionally, the first mounting hole further includes a third section connected to the second section, the inner diameter of the third section being smaller than the inner diameter of the second section to form a second stepped surface, and the elastic member abutting between the third section and the second stepped surface.

[0012] Optionally, the first mounting hole further includes a third section, which is connected to the second section, and the inner diameter of the third section is smaller than the inner diameter of the second section; the leak-proof positioning device further includes a second wear-resistant sleeve, which is disposed inside the third section, and a portion of the fourth part is fitted with the second wear-resistant sleeve and is movable relative to the second wear-resistant sleeve.

[0013] In the above scheme, the fourth part is fitted inside the second wear-resistant sleeve to reduce the wear generated by the fourth part when the positioning pin moves. Furthermore, the simultaneous use of the second wear-resistant sleeve and the first wear-resistant sleeve can improve the detection accuracy of the photoelectric sensor, while also ensuring that the force on both ends of the positioning pin is uniform, reducing the offset of the positioning pin and improving the positioning accuracy of the positioning pin.

[0014] Optionally, the positioning seat is provided with a first limiting hole and a second limiting hole. Along the radial direction of the positioning pin, the first limiting hole and the second limiting hole are arranged opposite to each other and are both connected to the third segment. The leak-proof positioning device also includes a first bolt and a second bolt. The first bolt is threaded into the first limiting hole, and the second bolt is threaded into the second limiting hole to clamp the second wear-resistant sleeve.

[0015] In the above scheme, the first bolt and the second bolt clamp the second wear-resistant sleeve on opposite sides to reduce the displacement of the second wear-resistant sleeve.

[0016] Optionally, the elastic element abuts between the third part and the second wear-resistant sleeve.

[0017] Optionally, the fourth part is provided with a first annular groove at the end away from the third part; the leak-proof positioning device further includes a limiting part, which is disposed in the first annular groove and located outside the third segment. Along the axial direction of the first mounting hole, the positioning seat has a first end face and a second end face, the first segment penetrates the first end face, the third segment penetrates the second end face, and along the axial direction of the first mounting hole, the projection of the limiting part falls into the projection of the second end face.

[0018] In the above scheme, when the locating pin is in the initial position where it is not pressed by the welded nut, the limiting part abuts against the first end face of the locating seat, thus restricting the displacement of the locating pin.

[0019] Optionally, the leak-proof positioning device further includes a first positioning part, which is movable relative to the positioning seat along the axial direction of the positioning pin. The first positioning part has a first positioning protrusion. The positioning seat has a second positioning protrusion. The first positioning protrusion and the second positioning protrusion are spaced apart along a first direction to limit the first sub-component in a first direction, which is perpendicular to the axial direction of the positioning pin.

[0020] In the above scheme, the first positioning protrusion and the second positioning protrusion clamp the first sub-component in the first direction A, reducing the displacement of the first sub-component and improving the positioning accuracy.

[0021] Optionally, the positioning seat also has a third positioning protrusion along the second direction, the third positioning protrusion being used to limit the first sub-component, the second direction, the first direction and the axis of the positioning pin being perpendicular to each other.

[0022] Optionally, the leak-proof positioning device further includes a second positioning part, which is movable relative to the positioning seat along the axial direction of the positioning pin. The second positioning part is spaced apart from the positioning seat along the axial direction of the positioning pin to limit the first sub-component in the axial direction of the positioning pin.

[0023] In the above scheme, the second positioning part clamps the first sub-component with the positioning seat, reducing the displacement of the first sub-component and improving the positioning accuracy. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a perspective view of the leak-proof positioning device of this application;

[0026] Figure 2 This is a cross-sectional view of the leak-proof positioning device of this application, wherein the positioning pin is under pressure;

[0027] Figure 3 This is a cross-sectional view of the leak-proof positioning device of this application, in which the positioning pin is in an unpressurized state.

[0028] [Explanation of Labels in the Attached Image]

[0029] 100: First sub-component; 101: First hole; 200: Weld nut;

[0030] 300: Positioning seat; 301: First mounting hole; 3011: First section; 3012: Second section; 3013: First stepped surface; 3014: Third section; 3015: Second stepped surface; 302: First limiting hole; 303: Second limiting hole; 304: Third limiting hole; 308: First end face; 309: Second end face;

[0031] 400: Locating pin; 401: First part; 402: Second part; 403: Third part; 404: Fourth part; 405: First annular groove;

[0032] 500: Elastic component;

[0033] 600: Photoelectric sensor;

[0034] 701: First wear-resistant sleeve; 702: Second wear-resistant sleeve;

[0035] 800: Limiting part;

[0036] 901: First positioning part; 902: First positioning protrusion; 903: Second positioning protrusion; 904: Third positioning protrusion; 905: Positioning lifting cylinder; 906: Positioning clamping cylinder; 907: Second positioning part;

[0037] A: First direction; B: Second direction; C: Axial direction of the locating pin. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0040] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0043] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0044] The vehicle body welding assembly consists of many sub-components, many of which have square nuts for welding to meet functional assembly requirements. In the industry, welding sub-components to square nuts is mostly done manually using projection welding, which is prone to missed welds. Similarly, the welding of sub-components to the assembly is often done manually, which also leads to the problem of missing sub-components. To address the issues of missed welds on square nuts and missed sub-components, some positioning devices currently incorporate multiple photoelectric sensors to simultaneously detect leaks in both the nuts and sub-components. However, this simultaneous detection of leaks in both leads to an overly complex positioning device structure, interfering with the automated trajectory of the vehicle body assembly and preventing welding. Therefore, this application improves the positioning device by integrating positioning and leak prevention into one unit, reducing the need for photoelectric sensors, simplifying the device's structure, and achieving the goal of not affecting the automated welding trajectory of the vehicle body assembly. This solves the problem of the automated welding gun being unable to enter the welding torch within limited space; it also achieves dual leak prevention detection for sub-components and nuts, reduces the development cost of the positioning device, and improves production efficiency.

[0045] refer to Figures 1 to 3This application provides a leak-proof positioning device for welding a vehicle body assembly. The vehicle body assembly includes a first sub-component 100 and a welding nut 200. The first sub-component 100 has a first hole 101. The welding nut 200 is adapted to be welded to the first sub-component 100 and is disposed around the first hole 101. The leak-proof positioning device includes a positioning seat 300, a positioning pin 400, an elastic element 500, and a photoelectric sensor 600. The positioning seat 300 has a first mounting hole 301. The positioning pin 400 is disposed in the first mounting hole 301 and is used to position the first sub-component 100 and the welding nut 200. The positioning pin 400 includes... The first part 401, the second part 402, and the third part 403 are connected in sequence. The outer diameter of the first part 401 is less than or equal to the inner diameter of the welding nut 200, the outer diameter of the second part 402 is greater than the inner diameter of the welding nut 200, and the outer diameter of the second part 402 is less than or equal to the inner diameter of the first hole 101. The elastic element 500 is disposed in the first mounting hole 301 and abuts against the end of the third part 403 away from the second part 402 to support the positioning pin 400. The photoelectric sensor 600 is disposed on the positioning seat 300 and is adapted to send a signal to the control unit after detecting that the positioning pin 400 is moved by the welding nut 200.

[0046] The leak-proof positioning device for a vehicle body assembly proposed in this application embodiment has a positioning pin 400 disposed in the first mounting hole 301 of the positioning seat 300 for positioning the first sub-component 100 and the welding nut 200. The first part 401 of the positioning pin 400 can pass through the inner hole of the welding nut 200, and the second part 402 of the positioning pin 400 can be inserted into the first hole 101 of the first sub-component 100. After the welding nut 200 is welded to the first sub-component 100, the welding nut 200 and the first sub-component 100 are placed together on the positioning seat 300. The first part 401 extends into the inner hole of the welding nut 200. Since the outer diameter of the second part 402 is larger than the inner hole of the welding nut 200, the welding nut 200 will press against the second part 402, thereby causing the positioning pin 400 to press against the elastic member 500 and retract into the first mounting hole 301. When the locating pin 400 retracts into the first mounting hole 301 until the photoelectric sensor 600 detects a signal, the photoelectric sensor 600 transmits the signal to the control unit, indicating that the welding nut 200 and the first sub-component 100 are simultaneously placed on the locating seat 300. If only the first sub-component 100 is placed on the locating seat 300, since the inner diameter of the first hole 101 is larger than the outer diameter of the second part 402, the first sub-component 100 will not press the locating pin 400 to retract into the first mounting hole 301, and the photoelectric sensor 600 will not detect a signal. If neither the first sub-component 100 nor the welding nut 200 is placed on the locating seat 300, the locating pin 400 will not retract into the first mounting hole 301, and the photoelectric sensor 600 will not detect a signal, thus reminding the operator that there is a missed weld or missing component.

[0047] When the welding nut 200 and the first sub-component 100 are not placed on the positioning seat 300, the positioning pin 400 is in its initial state, and the photoelectric sensor 600 cannot detect the signal of the positioning pin 400. Only when the welding nut 200 and the first sub-component 100 are placed on the positioning seat 300 at the same time, the welding nut 200 presses against the second part 402, causing the positioning pin 400 to retract into the first mounting hole 301, and the third part 403 presses against the elastic member 500. At this time, the third part 403 of the positioning pin 400 moves to correspond with the photoelectric sensor 600, and the photoelectric sensor 600 can detect the signal of the third part 403, thus indicating that the assembly composed of the first sub-component 100 and the welding nut 200 is qualified. When the first sub-component 100 and the welding nut 200 are removed from the positioning seat 300, the positioning pin 400 returns to its initial state under the action of the elastic member 500.

[0048] When the welding nut 200 and the first sub-component 100 are not placed on the positioning seat 300 and the positioning pin 400 is in the initial state, the photoelectric sensor 600 cannot sense the signal of the positioning pin 400. This can be understood as follows: at this time, the position corresponding to the photoelectric sensor 600 is not set with the positioning pin 400, or the outer diameter of the positioning pin 400 at this position is small, and the distance between the photoelectric sensor 600 and this segment of the positioning pin 400 is large, so the photoelectric sensor 600 cannot sense the signal of this segment of the positioning pin 400.

[0049] In the leak-proof positioning device of this application, the first part 401 of the positioning pin 400 can pass through the welding nut 200, and the outer diameter of the second part 402 is larger than that of the welding nut 200. The welding nut 200 can press the positioning pin 400 back into the first mounting hole 301, so that the photoelectric sensor 600 can detect the signal of the positioning pin 400, indicating that the positioning pin 400 has been displaced. This indicates that the welding nut 200 and the first sub-component 100 are welded normally and without any omissions, and the welding process of the body assembly can proceed normally. This application only uses one photoelectric sensor 600, reducing the investment in photoelectric sensors 600, lowering costs, simplifying the structure of the leak-proof positioning device, and optimizing the welding space of the body assembly.

[0050] In one specific embodiment, the positioning base 300 is provided with a second mounting hole, and the photoelectric sensor 600 is disposed in the second mounting hole. The second mounting hole communicates with the first mounting hole 301. When the positioning pin 400 is in the initial unpressurized state, the photoelectric sensor 600 cannot detect the signal of the positioning pin 400. Disposing the photoelectric sensor 600 in the second mounting hole of the positioning base 300 can effectively improve the service life of the photoelectric sensor 600.

[0051] Optionally, refer to Figure 2 and Figure 3The positioning pin 400 also includes a fourth part 404, which is connected to the third part 403. The elastic element 500 is sleeved on the fourth part 404, and the outer diameter of the fourth part 404 is smaller than the outer diameter of the third part 403.

[0052] The elastic element 500 is fitted onto the fourth part 404. When the positioning pin 400 retracts into the first mounting hole 301, the third part 403 presses against the elastic element 500. When the welding nut 200 disengages from the positioning pin 400, the positioning pin 400 returns to its initial state under the action of the elastic element 500. The outer diameter of the fourth part 404 is smaller than that of the third part 403. When the welding nut 200 and the first sub-component 100 are not placed on the positioning seat 300, the positioning pin 400 is in the initial position, and the distance between the fourth part 404 and the photoelectric sensor 600 is large. The photoelectric sensor 600 cannot sense the signal of the fourth part 404, thereby reducing the influence of the fourth part 404 on the detection result of the photoelectric sensor 600. When the welding nut 200 and the first sub-component 100 are placed on the positioning seat 300, the welding nut 200 presses against the second part 402, causing the positioning pin 400 to move into the first mounting hole 301. The third part 403 of the positioning pin 400 moves to the position corresponding to the photoelectric sensor 600. Since the outer diameter of the third part 403 is larger than that of the fourth part 404, the distance between the photoelectric sensor 600 and the third part 403 is small. The photoelectric sensor 600 can detect the signal of the third part 403, thereby outputting a signal to the control unit, indicating that the welding nut 200 and the first sub-component 100 are qualified.

[0053] Optionally, refer to Figure 2 and Figure 3 The first mounting hole 301 includes a first section 3011 and a second section 3012 connected together. The inner diameter of the first section 3011 is larger than the inner diameter of the second section 3012 to form a first stepped surface 3013. The leak-proof positioning device also includes a first wear-resistant sleeve 701, which is disposed on the first section 3011 and abuts against the first stepped surface 3013. The third part 403 is fitted inside the first wear-resistant sleeve 701 and can move relative to the first wear-resistant sleeve 701.

[0054] The first wear-resistant sleeve 701 is disposed within the first section 3011, and the outer peripheral surface of the first wear-resistant sleeve 701 abuts against the inner peripheral surface of the first section 3011. One end face of the first wear-resistant sleeve 701 abuts against the first stepped surface 3013, and the first stepped surface 3013 prevents the first wear-resistant sleeve 701 from moving within the first mounting hole 301 along with the third part 403. The third part 403 is fitted within the first wear-resistant sleeve 701 to reduce the wear generated by the third part 403 when the positioning pin 400 moves, thereby improving the detection accuracy of the photoelectric sensor 600.

[0055] In one specific embodiment, the positioning seat 300 is also provided with a third limiting hole 304, and a third bolt (not shown in the figure) is threaded in the third limiting hole 304. The third bolt tightens the first wear-resistant sleeve 701, further reducing the displacement of the first wear-resistant sleeve 701.

[0056] Optionally, refer to Figure 2 and Figure 3 The first mounting hole 301 also includes a third section 3014, which is connected to the second section 3012. The inner diameter of the third section 3014 is smaller than the inner diameter of the second section 3012 to form a second stepped surface 3015. The elastic member 500 abuts between the third part 403 and the second stepped surface 3015.

[0057] The elastic element 500 is sleeved on the fourth part 404. When the positioning pin 400 is pressed and retracts into the first mounting hole 301, the third part 403 presses against the elastic element 500. When the welding nut 200 is disengaged from the positioning pin 400, the positioning pin 400 returns to its initial state under the action of the elastic element 500.

[0058] Optionally, refer to Figure 2 and Figure 3 The first mounting hole 301 also includes a third section 3014, which is connected to the second section 3012. The inner diameter of the third section 3014 is smaller than the inner diameter of the second section 3012. The leak-proof positioning device also includes a second wear-resistant sleeve 702, which is located inside the third section 3014. A portion of the fourth part 404 is fitted into the second wear-resistant sleeve 702 and can move relative to the second wear-resistant sleeve 702.

[0059] The second wear-resistant sleeve 702 is disposed inside the third section 3014, and the outer peripheral surface of the second wear-resistant sleeve 702 abuts against the inner peripheral surface of the third section 3014. The fourth part 404 is fitted inside the second wear-resistant sleeve 702 to reduce the wear generated by the fourth part 404 when the positioning pin 400 moves. The simultaneous use of the second wear-resistant sleeve 702 and the first wear-resistant sleeve 701 can improve the detection accuracy of the photoelectric sensor 600, while also making the force on both ends of the positioning pin 400 uniform, reducing the offset of the positioning pin 400, and improving the positioning accuracy of the positioning pin 400.

[0060] Optionally, refer to Figure 2 and Figure 3 The positioning seat 300 is provided with a first limiting hole 302 and a second limiting hole 303. Along the radial direction of the positioning pin 400, the first limiting hole 302 and the second limiting hole 303 are arranged opposite to each other and are both connected to the third section 3014. The anti-leakage positioning device also includes a first bolt and a second bolt (not shown in the figure). The first bolt is threaded into the first limiting hole 302 and the second bolt is threaded into the second limiting hole 303 to clamp the second wear-resistant sleeve 702.

[0061] Along the radial direction of the positioning pin 400, the positioning seat 300 is provided with a first limiting hole 302 and a second limiting hole 303. A first bolt and a second bolt are respectively fitted in the first limiting hole 302 and the second limiting hole 303. The first bolt and the second bolt clamp the second wear-resistant sleeve 702 on opposite sides to reduce the displacement of the second wear-resistant sleeve 702.

[0062] Optionally, refer to Figure 2 and Figure 3 The elastic element 500 abuts between the third part 403 and the second wear-resistant sleeve 702. The elastic element 500 is disposed between the third part 403 and the second wear-resistant sleeve 702 to reduce the size of the outer diameter of the elastic element 500 protruding from the fourth section, thereby reducing the influence of the elastic element 500 on the detection result of the photoelectric sensor 600.

[0063] Optionally, refer to Figure 2 and Figure 3 The fourth part 404 is provided with a first annular groove 405 at one end away from the third part 403; the leak-proof positioning device also includes a limiting part 800, which is provided in the first annular groove 405 and located outside the third section 3014. Along the axial direction of the first mounting hole 301, the positioning seat 300 has a first end face 308 and a second end face 309. The first section 3011 passes through the first end face 308, and the third section 3014 passes through the second end face 309. Along the axial direction of the first mounting hole 301, the projection of the limiting part 800 falls into the projection of the second end face 309.

[0064] The first end face 308 of the positioning seat 300 is used to place the first sub-component 100 and the welding nut 200. The limiting part 800 is provided in the first annular groove 405. Along the axial direction of the first mounting hole 301, the projection of the limiting part 800 falls into the projection of the second end face 309. That is, the part of the limiting part 800 protruding from the outer peripheral surface of the fourth part 404 can abut against the second end face 309. When the positioning pin 400 is in the initial position where it is not pressed by the welding nut 200, the limiting part 800 abuts against the first end face 308 of the positioning seat 300, restricting the displacement of the positioning pin 400.

[0065] The limiting part 800 can be fixedly connected in the first annular groove 405 or inserted into the first annular groove 405.

[0066] Optionally, refer to Figure 1The leak-proof positioning device also includes a first positioning part 901, which is movable relative to the positioning seat 300 along the axial direction C of the positioning pin 400. The first positioning part 901 has a first positioning protrusion 902. The positioning seat 300 has a second positioning protrusion 903, which is spaced apart along the first direction A to limit the first sub-component 100 in the first direction A, which is perpendicular to the axial direction C of the positioning pin 400.

[0067] The anti-leakage positioning device also has a positioning lifting cylinder 905, which can drive the first positioning part 901 to move along the axial direction C of the positioning pin 400. Along the first direction A, the first positioning protrusion 902 on the first positioning part 901 and the second positioning protrusion 903 on the positioning seat 300 form a clamping space. When the first sub-component 100 is placed on the first end face 308 of the positioning seat 300, the first positioning protrusion 902 and the second positioning protrusion 903 clamp the first sub-component 100 in the first direction A, reducing the displacement of the first sub-component 100 and improving the positioning accuracy.

[0068] Specifically, the positioning seat 300 includes a positioning seat body and a second positioning protrusion 903. The second positioning protrusion 903 is detachably disposed on the positioning seat body. The positioning seat body has a first end face 308 and a second end face 309. After the first sub-component 100 is placed on the first end face 308 of the positioning seat body and the first sub-component 100 abuts against the first positioning protrusion 902 on one side along the first direction A, the second positioning protrusion 903 is installed on the positioning seat body so as to clamp the first sub-component 100 together with the first positioning protrusion 902 along the first direction A.

[0069] Optionally, refer to Figure 1 The positioning seat 300 also has a third positioning protrusion 904 along the second direction B. The third positioning protrusion 904 is used to limit the first sub-component 100. The second direction B, the first direction A, and the axial direction C of the positioning pin 400 are perpendicular to each other. The third positioning protrusion 904 on the positioning seat 300 is used to position the first sub-component 100 at one end in the second direction B.

[0070] Optionally, refer to Figure 1 The leak-proof positioning device also includes a second positioning part 907. Along the axial direction C of the positioning pin 400, the second positioning part 907 is movable relative to the positioning seat 300. Along the axial direction C of the positioning pin 400, the second positioning part 907 is spaced apart from the positioning seat 300 to limit the first sub-component 100 on the axial direction C of the positioning pin 400.

[0071] The anti-leakage positioning device also has a positioning clamping cylinder 906, which can drive the second positioning part 907 to approach or move away from the positioning seat 300. When the first sub-component 100 is placed on the first end face 308 of the positioning seat 300, the positioning clamping cylinder 906 drives the second positioning part 907 to approach the positioning seat 300 to clamp the first sub-component 100, reduce the displacement of the first sub-component 100, and improve the positioning accuracy.

[0072] In this application, after the first sub-component 100 is placed on the positioning seat 300, since the first part 401 of the positioning pin 400 can enter the inner hole of the welding nut 200, and the outer diameter of the second part 402 is larger than the inner diameter of the welding nut 200, and the outer diameter of the second part 402 is less than or equal to the inner diameter of the first hole 101 of the first sub-component 100, that is, after the first sub-component 100 is placed on the positioning seat 300, the first sub-component 100 cannot cause the second part 402 of the positioning pin 400 to be pressed back into the first mounting hole 301. Only when the welding nut 200 is welded on the first sub-component 100, and the welding nut 200 and the first sub-component 100 are placed on the positioning seat 300 at the same time, the welding nut 200 will press against the second part 402, causing the second part 402 of the positioning pin 400 to retract into the first mounting hole 301, so as to detect the leakage of the welding nut 200. The outer diameter of the fourth part 404 of the positioning pin 400 is smaller than the outer diameter of the third part 403. When the positioning pin 400 is not pressed, the distance between the photoelectric sensor 600 and the fourth part 404 is large, and the signal of the photoelectric sensor 600 cannot be detected. When the positioning pin 400 is pressed, the positioning pin 400 retracts into the first mounting hole 301. Since the outer diameter of the third part 403 is large, the distance between the third part 403 and the photoelectric sensor 600 is small, and the photoelectric sensor 600 can detect the signal of the third part 403. This indicates that the welding nut 200 and the first sub-component 100 are installed normally, and there is no situation where the welding nut 200 is missing or the first sub-component 100 is missing from the mounting seat. This reduces the risk of line stoppage caused by missing welding or missing placement on the body production line.

[0073] The positioning process of the first sub-component 100 and the welding nut 200 on the leak-proof positioning device is as follows: the first part 401 of the positioning pin 400 passes through the first hole 101 of the first sub-component 100 and the inner hole of the welding nut 200, and the first sub-component 100 abuts against the third positioning protrusion 904 on one side of the second direction B; the positioning lifting cylinder 905 is opened to drive the first positioning part 901 to move until the first positioning protrusion 902 abuts against the first sub-component 100 on one side of the first direction A; then the second positioning protrusion 903 is installed on the positioning seat 300 so that the second positioning protrusion 903 abuts against the other side of the first sub-component 100 on the first direction A; the positioning clamping cylinder 906 is opened so that the second positioning part 907 clamps the first sub-component 100 along the axial direction C of the positioning pin 400, thereby realizing the positioning of the first sub-component 100 and the welding nut 200.

[0074] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0075] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0076] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0077] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A leak-proof positioning device for welding a vehicle body assembly, the vehicle body assembly including a first sub-component (100) and a welding nut (200), the first sub-component (100) having a first hole (101), the welding nut (200) being adapted to be welded to the first sub-component (100) and disposed around the first hole (101), characterized in that, include: A positioning seat (300) is provided with a first mounting hole (301); A positioning pin (400) is provided in the first mounting hole (301) and is used to position the first sub-component (100) and the welding nut (200). The positioning pin (400) includes a first part (401), a second part (402) and a third part (403) connected in sequence. The outer diameter of the first part (401) is less than or equal to the inner diameter of the welding nut (200). The outer diameter of the second part (402) is greater than the inner diameter of the welding nut (200). The outer diameter of the second part (402) is less than or equal to the inner diameter of the first hole (101). An elastic element (500) is disposed in the first mounting hole (301) and abuts against the end of the third part (403) away from the second part (402) to support the positioning pin (400); A photoelectric sensor (600) is disposed on the positioning base (300), and the photoelectric sensor (600) is adapted to send a signal to the control unit after detecting that the positioning pin (400) is moved by the welding nut (200).

2. The leak-proof positioning device according to claim 1, characterized in that, The positioning pin (400) also includes a fourth part (404), which is connected to the third part (403). The elastic element (500) is sleeved on the fourth part (404), and the outer diameter of the fourth part (404) is smaller than the outer diameter of the third part (403).

3. The leak-proof positioning device according to claim 2, characterized in that, The first mounting hole (301) includes a first segment (3011) and a second segment (3012) connected together, wherein the inner diameter of the first segment (3011) is larger than the inner diameter of the second segment (3012) to form a first stepped surface (3013); The leak-proof positioning device also includes a first wear-resistant sleeve (701), which is disposed in the first section (3011) and abuts against the first step surface (3013). The third part (403) is fitted inside the first wear-resistant sleeve (701) and can move relative to the first wear-resistant sleeve (701).

4. The leak-proof positioning device according to claim 3, characterized in that, The first mounting hole (301) further includes a third segment (3014), which is connected to the second segment (3012). The inner diameter of the third segment (3014) is smaller than the inner diameter of the second segment (3012) to form a second stepped surface (3015). The elastic member (500) abuts between the third part (403) and the second stepped surface (3015).

5. The leak-proof positioning device according to claim 3, characterized in that, The first mounting hole (301) further includes a third segment (3014), which is connected to the second segment (3012), and the inner diameter of the third segment (3014) is smaller than the inner diameter of the second segment (3012); The leak-proof positioning device also includes a second wear-resistant sleeve (702), which is disposed within the third section (3014). A portion of the fourth part (404) is engaged with the second wear-resistant sleeve (702) and is movable relative to the second wear-resistant sleeve (702).

6. The leak-proof positioning device according to claim 5, characterized in that, The positioning seat (300) is provided with a first limiting hole (302) and a second limiting hole (303). Along the radial direction of the positioning pin (400), the first limiting hole (302) and the second limiting hole (303) are arranged opposite to each other and are both connected to the third segment (3014). The leak-proof positioning device further includes a first bolt and a second bolt, the first bolt being threaded into the first limiting hole (302), and the second bolt being threaded into the second limiting hole (303) to clamp the second wear-resistant sleeve (702).

7. The leak-proof positioning device according to claim 5, characterized in that, The elastic element (500) abuts between the third part (403) and the second wear-resistant sleeve (702).

8. The leak-proof positioning device according to claim 4, characterized in that, The fourth part (404) is provided with a first annular groove (405) at the end away from the third part (403); The leak-proof positioning device also includes a limiting part (800), which is disposed in the first annular groove (405) and located outside the third segment (3014). Along the axial direction of the first mounting hole (301), the positioning seat (300) has a first end face (308) and a second end face (309). The first segment (3011) penetrates the first end face (308), and the third segment (3014) penetrates the second end face (309). Along the axial direction of the first mounting hole (301), the projection of the limiting part (800) falls into the projection of the second end face (309).

9. The leak-proof positioning device according to claim 1, characterized in that, The leak-proof positioning device further includes a first positioning part (901) along the axial direction (C) of the positioning pin (400). The first positioning part (901) is movable relative to the positioning seat (300). The first positioning part (901) has a first positioning protrusion (902). The positioning seat (300) has a second positioning protrusion (903) along a first direction (A). The first positioning protrusion (902) and the second positioning protrusion (903) are spaced apart to limit the first sub-component (100) in the first direction (A), which is perpendicular to the axial direction (C) of the positioning pin (400).

10. The leak-proof positioning device according to claim 9, characterized in that, The positioning seat (300) also has a third positioning protrusion along the second direction (B), which is used to limit the first sub-component (100). The second direction (B), the first direction (A), and the axial direction (C) of the positioning pin (400) are perpendicular to each other.

11. The leak-proof positioning device according to claim 1, characterized in that, The leak-proof positioning device further includes a second positioning part (907) along the axial direction (C) of the positioning pin (400). The second positioning part (907) is movable relative to the positioning seat (300) along the axial direction (C) of the positioning pin (400). The second positioning part (907) and the positioning seat (300) are spaced apart to limit the first sub-component (100) on the axial direction (C) of the positioning pin (400).

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