Combined positioning pin

Abstract

The invention relates to a combined positioning pin, and relates to the technical field of connecting pieces, the positioning pin comprises a butt joint plug, a limiting circular truncated cone and a fixing stud, and the butt joint plug, the limiting circular truncated cone and the fixing stud are coaxially connected in sequence; an elastic expansion ring is arranged between the butt joint plug and the limiting circular truncated cone, the elastic expansion ring and the limiting circular truncated cone are coaxially arranged, one axial end of the elastic expansion ring abuts against the limiting circular truncated cone, and the other axial end of the elastic expansion ring abuts against the butt joint plug. Through the arrangement of the elastic expansion ring, when the positioning pin is inserted into the positioning hole of the workpiece, the elastic expansion ring can fix the workpiece in the axial direction of the positioning pin, so that the workpiece is effectively prevented from moving slightly in the axial direction of the positioning pin, the workpiece fixing stability is improved, and the workpiece welding precision is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of connectors, and in particular to a combined positioning pin. Background Art

[0002] In the welding process of workpieces, in order to ensure the welding accuracy of the workpieces, it is necessary to fix the workpieces to the corresponding welding jigs to ensure accurate positioning of the workpieces on the welding jigs.

[0003] Currently, in order to ensure accurate positioning of the workpiece on the welding jig, positioning pins are often installed on the welding jig. When welding is performed, the workpiece is placed on the welding jig. At this time, the positioning holes on the workpiece are inserted into the corresponding positioning pins on the welding jig, which enables the workpiece to be quickly and accurately positioned on the welding jig.

[0004] Regarding the above related technologies, since the workpiece is inserted and matched with the corresponding positioning pin along the axial direction of the positioning pin, after the workpiece is installed on the welding jig, the workpiece can still move axially along the positioning pin. This may cause the workpiece to experience slight movement along the axial direction of the positioning pin due to vibrations and other influences during the processing, which will affect the welding accuracy of the workpiece. Summary of the Invention

[0005] This application provides a combined positioning pin, the purpose of which is to enhance the positioning function of the positioning pin, enable the positioning pin to fix the corresponding workpiece along its own axial direction, thereby reducing the influence of vibration on the workpiece and ensuring the welding accuracy of the workpiece.

[0006] The combined positioning pin provided by this application adopts the following technical solutions: A combined positioning pin includes a docking plug, a limiting frustum, and a fixing stud. The docking plug, the limiting frustum, and the fixing stud are coaxially connected in sequence; the limiting frustum is screwed to the docking plug, and an elastic expansion ring is arranged between the docking plug and the limiting frustum. The elastic expansion ring is coaxially arranged with the limiting frustum, and one axial end of the elastic expansion ring abuts against the limiting frustum, and the other end abuts against the docking plug.

[0007] By adopting the above technical solutions, first of all, the setting of the fixing stud enables the positioning pin to be installed on the welding jig by screwing. The limiting frustum realizes the connection between the docking plug and the fixing stud, and at the same time, the limiting frustum can sink into the counterbore on the welding jig, thereby making the positioning direction of the welding jig accurate. The docking plug is used to be inserted into the corresponding positioning hole on the workpiece to realize workpiece positioning. Therefore, under the combined action of the fixing stud, the limiting frustum, and the docking plug, the basic function of the positioning pin can be realized.

[0008] On this basis, the docking plug is screwed with the limiting cone, which makes the docking plug detachable, and enables the docking plug to select different shapes according to actual requirements, so that the locating pin of the present application can be freely converted between cylindrical pins, diamond pins and polygonal pins, which can improve the applicability of the locating pin of the present application.

[0009] Since the docking plug is screwed to the limiting cone, and an elastic expansion ring is arranged between the docking plug and the limiting cone, the docking plug is moved toward the limiting cone by twisting the docking plug, which can resist the deformation of the elastic expansion ring. Based on such a design, the docking plug is twisted in advance, so that the elastic expansion ring is pre-expanded radially, so that when the positioning pin is inserted into the corresponding positioning hole of the workpiece, after the docking plug is inserted into the corresponding positioning hole, pressure is continued to be applied to the workpiece, and the elastic expansion ring is stuck in the corresponding positioning hole due to its own elastic deformation. At this time, the elastic expansion ring will resist the inner wall of the corresponding positioning hole, thereby increasing the friction between the elastic expansion ring and the inner wall of the positioning hole, which enables the elastic expansion ring to fix the workpiece along the axial direction of the positioning pin, thereby effectively preventing the workpiece from micro-moving along the axial direction of the positioning pin, thereby improving the stability of the workpiece fixation and ensuring the welding accuracy of the workpiece.

[0010] Optionally, the docking plug includes a locking bolt, an introduction ring and several intermediate rings, the locking bolt is coaxially threaded with the limiting cone, the introduction ring, the intermediate ring and the elastic expansion ring are coaxially sleeved on the locking bolt, several intermediate rings are located between the introduction ring and the elastic expansion ring, one axial end of the elastic expansion ring is in contact with the adjacent intermediate ring, and the other end is in contact with the limiting cone.

[0011] By adopting the above technical solution, the docking plug is designed with a locking bolt, a guide ring and an intermediate ring. Under the action of the locking bolt, the nut of the locking bolt can press the guide ring and several intermediate rings, thereby making the docking plug structure stable and realizing the function of the docking plug.

[0012] On this basis, after the locking bolt is removed from the limiting round table, the number of intermediate rings can be freely increased or decreased, thereby changing the height of the docking plug. This allows the docking plug to adapt to positioning holes of different depths on the workpiece, which can improve the applicability of the locating pin.

[0013] In addition, based on the structural design of the docking plug, after the positioning hole of the workpiece is plugged into the docking plug, the locking bolt is turned to make the guide ring and the intermediate ring move toward the direction of the limiting cone, thereby squeezing the elastic expansion ring to expand radially. The expanded elastic expansion ring will tightly contact the inner wall of the corresponding positioning hole, increasing friction, thereby improving the stability of the workpiece installation.

[0014] Optionally, the elastic expansion rings are also provided between the insertion ring and the adjacent intermediate ring and between two adjacent intermediate rings.

[0015] By adopting the above technical solution, since the elastic expansion rings are arranged between the insertion ring and the adjacent intermediate ring and between two adjacent intermediate rings, when the locking bolt is screwed, the multi-layer elastic expansion rings can provide uniform expansion force at different positions, ensuring a firm connection between the entire docking plug and the positioning hole on the workpiece, further reducing the risk of micro-movement of the workpiece caused by vibration, and thus significantly improving the welding accuracy.

[0016] Optionally, anti-rotation members are provided between the insertion ring and the adjacent intermediate ring, between two adjacent intermediate rings, and between the limiting frustum and the adjacent intermediate ring. The anti-rotation members are used to prevent the relative rotation between the intermediate ring and the corresponding intermediate ring or the insertion ring or the limiting frustum.

[0017] By adopting the above technical solution, the anti-rotation members can effectively prevent the relative rotation between the intermediate ring and the adjacent insertion ring, between two adjacent intermediate rings, and between the limiting frustum and the adjacent intermediate ring. This makes it possible that when the locking bolt is screwed, the insertion ring and the intermediate ring do not rotate relative to each other, so that the shape and structure of the docking plug remain stable, thus ensuring the normal use of the docking plug.

[0018] Optionally, an elastic expansion tube is coaxially sleeved outside the fixed stud, and one axial end of the elastic expansion tube abuts against the limiting frustum.

[0019] By adopting the above technical solution, based on the setting of the elastic expansion tube, when the positioning pin is installed on the welding jig, the fixed stud is screwed to the welding jig. After the elastic expansion tube is axially compressed by the limiting frustum, it generates radial expansion, so that the elastic expansion tube abuts against the inner side wall of the counterbore on the welding jig, forming frictional self-locking, thus significantly improving the installation stability of the positioning pin. At the same time, the elastic expansion tube has a buffering function, which can reduce the influence of vibration on the screw connection between the fixed stud and the welding jig, and further ensure the reliability of the connection.

[0020] Optionally, a lengthening stud is coaxially and detachably connected to the fixed stud. The fixed stud is axially located between the limiting frustum and the lengthening stud; there are several lengthening studs, and several lengthening studs are arranged in sequence along their own axes, and two adjacent lengthening studs are coaxially and detachably connected.

[0021] By adopting the above technical solution, since the lengthening stud is coaxially and detachably connected to the fixed stud, the lengthening stud can extend the effective length of the fixed stud, making the overall length of the positioning pin adjustable, so that the length of the elastic expansion tube can be selected according to actual needs.

[0022] Optionally, a mounting nut is sleeved on the outer side of the fixing stud or the growth stud, and the mounting nut is threadedly connected to the fixing stud or the growth stud; one axial end of the elastic expansion tube abuts against the mounting nut, and the other end abuts against the limiting cone.

[0023] By adopting the above technical solution, since there are various ways to install the positioning pin, the most common ones are screw connection, interference fit and expansion fixation.

[0024] When the mounting hole for installing the locating pin on the welding jig is a through hole, when the locating pin is inserted into the through hole of the welding jig, the mounting nut is turned to move the mounting nut along the fixed stud or the growth stud, thereby squeezing the elastic expansion tube to deform. The elastic expansion tube expands radially under axial pressure and fits tightly against the inner wall of the through hole of the welding jig to form friction self-locking, so that the locating pin of the present application can also be installed by expansion fixation, which increases the installation methods of the locating pin and improves the versatility of the locating pin.

[0025] Optionally, a hexagonal groove is formed on a side of the limiting cone that is axially away from the fixing stud, and the hexagonal groove is coaxially arranged with the fixing stud.

[0026] By adopting the above technical solution, a hexagonal groove is opened on the limiting circular table. Based on the opening of the hexagonal groove, the limiting circular table can be fixed by inserting a hexagonal wrench into the hexagonal groove, which makes it easy to screw the mounting nut and also makes it easy for the locating pin to be installed by expansion fixation.

[0027] Optionally, the elastic expansion tube includes a plurality of elastic deformation rings, which are coaxially sleeved on the outside of the fixing stud, and the plurality of elastic deformation rings are sequentially arranged along their own axial direction.

[0028] By adopting the above technical solution, the elastic expansion tube is composed of a plurality of elastic deformation rings, which are coaxially sleeved on the outside of the threaded fixing rod and arranged in sequence along its own axial direction. This design allows the length of the elastic expansion tube to be flexibly adjusted by increasing or decreasing the number of elastic deformation rings, so as to adapt to different usage requirements. At the same time, the structure of multiple elastic deformation rings can produce radial expansion when under pressure, enhance the friction with the inner wall of the welding fixture countersunk hole, and improve the stability of the locating pin installation. In addition, the segmented elastic deformation ring design can also effectively prevent the overall structure from torsional deformation and extend the service life of the elastic expansion tube.

[0029] Optionally, smooth layers are provided on both axial sides of the elastic deformation ring.

[0030] By adopting the above technical solution, the setting of the smooth layer effectively prevents the elastic deformation ring from being driven to rotate unnecessarily when the limiting frustum rotates, ensuring that the elastic deformation ring only undergoes radial deformation under the action of axial pressure. This can prevent torsional deformation between the elastic deformation rings and improve the service life of the elastic deformation rings.

[0031] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting the elastic expansion ring in the present application, when the docking plug is inserted into the positioning hole of the workpiece, the elastic expansion ring is snapped into the corresponding positioning hole. At this time, the elastic expansion ring abuts against the inner side wall of the corresponding positioning hole, which can increase the friction force between the elastic expansion ring and the inner side wall of the corresponding positioning hole, and can axially fix the workpiece along the positioning pin, thereby effectively preventing the workpiece from undergoing axial micro-movement along the positioning pin, improving the stability of workpiece fixation, and ensuring the welding accuracy of the workpiece.

[0032] 2. By setting the elastic expansion tube in the present application, when the positioning pin is installed on the welding jig, the elastic expansion tube is deformed under pressure, and the elastic expansion tube closely fits the inner wall of the counterbore of the welding jig to form frictional self-locking, enhancing the installation stability of the positioning pin and playing a shock-absorbing role at the same time, ensuring the stability of the connection between the positioning pin and the welding jig.

[0033] 3. Through the combined setting of the elastic expansion tube, the mounting nut and the extension stud in the present application, the positioning pin and the welding jig can be screwed or expanded and fixed, which can increase the installation methods of the positioning pin, thereby improving the applicability of the positioning pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure of the positioning pin according to Embodiment 1 of the present application.

[0035] Figure 2 is a schematic cross-sectional structure diagram of the positioning pin according to Embodiment 1 of the present application.

[0036] Figure 3 is a schematic diagram of the positioning pin during operation according to Embodiment 1 of the present application.

[0037] Figure 4 is a schematic diagram of the overall structure of the positioning pin according to Embodiment 2 of the present application.

[0038] Figure 5 is a schematic cross-sectional structure diagram of the positioning pin according to Embodiment 2 of the present application.

[0039] Figure 6 is a schematic diagram of the overall structure of the positioning pin according to Embodiment 3 of the present application.

[0040] Figure 7 is a schematic diagram of the overall structure of the positioning pin after removing all the elastic expansion rings according to Embodiment 3 of the present application.

[0041] Figure 8 It is a schematic diagram of the cross-sectional structure of the positioning pin of Example 3 of the present application.

[0042] Figure 9 It is a schematic diagram of the cross-sectional structure of another position of the positioning pin of Example 3 of the present application.

[0043] Figure 10 It is a schematic diagram of the overall structure of the positioning pin of Example 4 of the present application.

[0044] Figure 11 It is a schematic diagram of the cross-sectional structure of the elastic deformation ring of Example 4 of the present application.

[0045] Figure 12 It is a schematic diagram of the overall structure of the positioning pin of Example 5 of the present application.

[0046] Figure 13 It is a schematic diagram of the overall structure after the limiting cone, the fixing studs and the plurality of growth studs are assembled in Example 5 of the present application.

[0047] Figure 14 It is a schematic diagram of the overall structure of the growth stud of Example 5 of the present application.

[0048] Figure 15 This is a schematic diagram of the positioning pin after installation of Example 5 of the present application.

[0049] In the figure, 1, docking plug; 11, connecting column; 12, guide ring; 13, intermediate ring; 14, locking bolt; 15, anti-rotation piece; 151, boss; 152, sleeve; 2, limiting cone; 21, connecting hole; 22, hexagonal socket; 3, fixing stud; 4, elastic expansion ring; 41, clearance hole; 5, elastic expansion tube; 51, elastic deformation ring; 52, smooth layer; 6, growth stud; 61, extension column; 62, extension hole; 63, first pin hole; 64, second pin hole; 65, fixing pin; 7, mounting nut; 100, workpiece; 200, welding fixture. DETAILED DESCRIPTION

[0050] The following is combined with Figure 1 -Attached Figure 15 , further details of this application are given.

[0051] Embodiment 1: A combined positioning pin, referring to Figure 1 and Figure 2 , including a docking plug 1, a limiting truncated platform 2 and a fixing stud 3, the docking plug 1, the limiting truncated platform 2 and the fixing stud 3 are coaxially connected in sequence along the vertical direction, the fixing stud 3 is fixedly connected to the limiting truncated platform 2, and the docking plug 1 and the limiting truncated platform 2 are detachably connected.

[0052] Reference Figure 3, The setting of the fixing stud 3 enables the positioning pin to be screwed with the welding jig 200, thus realizing the installation of the positioning pin. The setting of the docking plug 1 can be inserted into the positioning hole of the corresponding workpiece 100, thus realizing the positioning function of the workpiece 100.

[0053] Refer to Figure 2 , In this embodiment, a connection hole 21 is coaxially opened on the upper side of the limiting frustum 2. A connection column 11 is coaxially connected to the lower end face of the docking plug 1. The connection column 11 is inserted and matched with the connection hole 21, and the connection column 11 is threadedly connected to the inner side wall of the connection hole 21.

[0054] In this embodiment, the radial cross-section of the docking plug 1 is circular or diamond-shaped or rectangular or square or polygonal.

[0055] The implementation principle of the embodiment of this application is that the user can quickly replace the matching docking plugs 1 with different shapes according to the positioning requirements of the workpiece 100, so that the positioning pin can meet different positioning requirements, thereby improving the applicability of the positioning pin.

[0056] Embodiment 2: A combined positioning pin, refer to Figure 4 and Figure 5 , The difference between this embodiment and Embodiment 1 is that the positioning pin further includes an elastic expansion ring 4. The elastic expansion ring 4 is coaxially arranged with the connection column 11. The elastic expansion ring 4 is sleeved outside the connection column 11, and the elastic expansion ring 4 is located between the docking plug 1 and the limiting frustum 2 along its own axis.

[0057] Due to the setting of the elastic expansion ring 4, when the docking plug 1 is screwed, the docking plug 1 and the limiting frustum 2 abut against the elastic expansion ring 4 and deform.

[0058] Refer to Figure 4 and Figure 5 , In this embodiment, the radial cross-section shape of the elastic expansion ring 4 is the same as the radial cross-section shape of the docking plug 1. This ensures that the elastic expansion ring 4 can be inserted into the positioning hole of the workpiece 100.

[0059] Refer to Figure 4 and Figure 5 , In this embodiment, one axial end of the elastic expansion ring 4 is fixedly connected to the docking plug 1, and the other end is rotatably connected to the limiting frustum 2. This enables the elastic expansion ring 4 to move synchronously with the docking plug 1 when the docking plug 1 is screwed, thereby ensuring that the outer side wall of the docking plug 1 is always flush with the outer side wall of the elastic expansion ring 4, and further ensuring that the docking plug 1 and the elastic expansion ring 4 can be inserted into the corresponding positioning hole of the workpiece 100 synchronously.

[0060] The implementation principle of the embodiments of this application is as follows: Before installing the workpiece 100, the docking plug 1 is finely adjusted so that the docking plug 1 moves towards the limiting frustum 2, which can cause the elastic expansion ring 4 to deform, and the elastic expansion ring 4 expands along its own radial direction. At this time, when the positioning hole of the workpiece 100 is inserted into the docking plug 1, the elastic expansion ring 4 can abut against the inner side wall of the positioning hole of the workpiece 100. This makes it necessary to overcome the friction between the elastic expansion ring 4 and the inner side wall of the positioning hole of the workpiece 100 when the workpiece 100 is separated from the positioning pin, so that the positioning pin can fix the workpiece 100 along its own axial direction, thereby reducing the influence of vibration on the workpiece 100 and ensuring the welding accuracy of the workpiece 100.

[0061] Embodiment 3: A combined positioning pin. Refer to Figure 6 and Figure 7 , the difference between this Embodiment 1 and Embodiment 2 is that: the docking plug 1 includes an introduction ring 12 and a plurality of intermediate rings 13. The introduction ring 12, the intermediate rings 13 and the limiting frustum 2 are coaxially arranged in sequence in the vertical direction. The plurality of intermediate rings 13 are axially located between the introduction ring 12 and the limiting frustum 2 along their own axes, and the plurality of intermediate rings 13 are arranged at intervals in sequence along their own axes.

[0062] Refer to Figure 7 and Figure 8 , the docking plug 1 further includes a locking bolt 14. The introduction ring 12 and the intermediate rings 13 are both sleeved outside the locking bolt 14, and the locking bolt 14 is inserted and matched with the connection hole 21, and the locking bolt 14 is threadedly connected with the inner side wall of the connection hole 21.

[0063] Based on the structural design of the docking plug 1, the intermediate rings 13 and the introduction ring 12 have the same shape. For example, the intermediate rings 13 and the introduction ring 12 are both circular or diamond-shaped or rectangular or square or polygonal to meet the functions of docking plugs 1 of different shapes.

[0064] Under the action of the locking bolt 14, the locking bolt 14 can press the introduction ring 12 and the plurality of intermediate rings 13 tightly, so that the shape and structure of the docking plug 1 are stable, and the functions of the docking plug 1 can be realized; at the same time, by increasing or decreasing the number of intermediate rings 13, the height of the docking plug 1 can be changed, and then the positioning holes with different depths on the workpiece can be adapted, which can improve the applicability of the positioning pin.

[0065] Refer to Figure 7 , anti-rotation parts 15 are provided between the introduction ring 12 and the adjacent intermediate ring 13, between adjacent two intermediate rings 13, and between the limiting frustum 2 and the adjacent intermediate ring 13. In this embodiment, the anti-rotation part 15 between adjacent two intermediate rings 13 is taken as an example for illustration.

[0066] Refer to Figure 7, the anti-rotation member 15 includes a plurality of convex columns 151 and a plurality of sleeves 152. The plurality of convex columns 151 are all arranged on the lower side of the middle ring 13, and the axial direction of the convex columns 151 is arranged vertically. The convex columns 151 are fixedly connected to the middle ring 13. The plurality of sleeves 152 are arranged on the upper side of the middle ring 13, and the axial direction of the sleeves 152 is arranged vertically. The sleeves 152 are fixedly connected to the middle ring 13. The convex columns 151 on the middle ring 13 are arranged in one-to-one correspondence with the sleeves 152 on the adjacent other middle ring 13, and the convex columns 151 are inserted and matched with the corresponding sleeves 152.

[0067] Therefore, the anti-rotation member 15 between two adjacent middle rings 13 can prevent the two adjacent middle rings 13 from rotating relative to each other. Similarly, under the action of a plurality of anti-rotation members 15, it can prevent the insertion ring 12 and the middle ring 13 from rotating relative to each other on the limiting frustum 2, which can maintain the stability of the structure of the docking plug 1. Thus, when the locking bolt 14 is screwed, the shape and structure of the docking plug 1 can remain stable, and then it can be inserted into the corresponding positioning hole to realize the function of the positioning pin.

[0068] In this embodiment, the convex columns 151 in the corresponding anti-rotation member 15 are arranged on the lower side of the insertion ring 12, then the corresponding sleeves 152 are arranged on the upper side of the corresponding middle ring 13; similarly, the sleeves 152 of the corresponding anti-rotation member 15 are arranged on the upper side of the limiting frustum 2, then the corresponding convex columns 151 are arranged on the lower side of the corresponding middle ring 13.

[0069] Refer to Figure 6 and Figure 8 , elastic expansion rings 4 are arranged between the insertion ring 12 and the adjacent middle ring 13, between two adjacent middle rings 13, and between the limiting frustum 2 and the adjacent middle ring 13. The elastic expansion rings 4 are coaxially sleeved outside the locking bolt 14. One axial side of the elastic expansion ring 4 abuts against the corresponding middle ring 13, and the other side abuts against the corresponding middle ring 13 or the insertion ring 12 or the limiting frustum 2. And the outer side wall of the elastic expansion ring 4 is flush with the outer side wall of the middle ring 13.

[0070] After the positioning pin is inserted into the positioning hole of the workpiece 100, the locking bolt 14 on the docking plug 1 is screwed. At this time, the nut of the locking bolt 14 abuts against the insertion ring 12, and then a plurality of insertion rings 12 and middle rings 13 move towards the direction of the limiting frustum 2, and then all the elastic expansion rings 4 are deformed and expanded. At this time, the elastic expansion rings 4 will abut against the inner side wall of the positioning hole of the workpiece 100, thereby increasing the stability of the fixation of the positioning pin and the workpiece 100.

[0071] In this embodiment, the elastic expansion rings 4, the middle rings 13 and the insertion rings 12 have the same shape, which ensures that the addition of the elastic expansion rings 4 will not affect the shape and structure of the docking plug 1, and thus will not affect the function of the docking plug 1.

[0072] In this embodiment, refer toFigure 7 and Figure 9 A plurality of relief holes 41 are formed in the elastic expansion ring 4, and the relief holes 41 are arranged in one-to-one correspondence with the sleeves 152. The sleeves 152 and the corresponding convex columns 151 are inserted into the corresponding relief holes 41 respectively.

[0073] On the one hand, the matching design of the anti-rotation member 15 and the relief hole 41 realizes the positioning and installation of the elastic expansion ring 4, improving the accuracy of the positioning and installation of the elastic expansion ring 4. On the other hand, the formation of the relief hole 41 also ensures the normal assembly of the anti-rotation member 15 and plays a role in preventing rotation.

[0074] The implementation principle of the embodiment of the present application is as follows: when using the positioning pin, according to the positioning requirements of the workpiece 100, the docking plug 1 with the corresponding shape is replaced. And according to the different depths of the positioning holes on the workpiece 100, the height of the docking plug 1 is flexibly adjusted by increasing or decreasing the number of intermediate rings 13 to adapt to different depths of positioning holes.

[0075] After the docking plug 1 on the positioning pin is inserted into the positioning hole of the workpiece 100, a wrench or a screwdriver is used outside the workpiece 100 to tighten the locking bolt 14. At this time, the locking bolt 14 presses the guiding ring 12 and the intermediate ring 13, forcing the elastic expansion rings 4 of each layer to expand radially, so that the elastic expansion rings 4 generate frictional clamping with the inner side wall of the positioning hole of the workpiece 100.

[0076] Embodiment 4: A combined positioning pin. Refer to Figure 10 The difference between this embodiment 1 and embodiment 2 is that an elastic expansion tube 5 is sleeved outside the fixed stud 3. One axial end of the elastic expansion tube 5 abuts against the limiting frustum 2, and the inner side wall of the elastic expansion tube 5 is spaced from the fixed stud 3.

[0077] Refer to Figure 3 and Figure 10 When the positioning pin is installed on the welding jig 200, the positioning pin is screwed to the corresponding installation hole of the welding jig 200 through the fixed stud 3. And after the positioning pin is installed, the limiting frustum 2 will also sink into the corresponding counterbore on the welding jig 200. After the elastic expansion tube 5 is provided, when the fixed stud 3 is screwed to the welding jig 200, as the fixed stud 3 is tightened, the limiting frustum 2 will abut against the elastic expansion tube 5 to deform, and then the elastic expansion tube 5 will abut against the inner side wall of the corresponding counterbore on the welding jig 200, so that the positioning pin can be clamped, which can increase the stability of the installation of the positioning pin. At the same time, the elastic expansion tube 5 has the function of an elastic gasket, which can reduce the influence of vibration on the screwing connection between the fixed stud 3 and the welding jig 200 and ensure the stability of the connection between the positioning pin and the welding jig 200.

[0078] Refer to Figure 10The elastic expansion tube 5 includes a plurality of elastic deformation rings 51, which are coaxially sleeved on the outside of the fixing stud 3, and the elastic deformation rings 51 are arranged in sequence along their own axial direction.

[0079] Since the elastic expansion tube 5 is composed of a plurality of elastic deformation rings 51 , the length of the elastic expansion tube 5 can be changed by increasing or decreasing the number of the elastic deformation rings 51 , so that the length of the elastic expansion tube 5 can be freely adjusted to adapt to different usage requirements.

[0080] Reference Figure 11 , smooth layers 52 are provided on both axial sides of the elastic deformation ring 51. In this embodiment, the smooth layer 52 is made of polytetrafluoroethylene coating or molybdenum disulfide solid lubricating coating or diamond-like carbon coating.

[0081] The provision of the smoothing layer 52 can increase the smoothness of the surface of the elastic deformation ring 51, thereby ensuring that the rotation of the limiting table 2 will not drive the rotation of several elastic deformation rings 51, so that the elastic deformation ring 51 is only subjected to axial pressure and produces radial deformation, which can prevent torsional deformation between the elastic deformation rings 51 and increase the service life of the elastic deformation ring 51.

[0082] The implementation principle of the embodiment of the present application is: when the locating pin is installed on the welding jig 200, as the fixing stud 3 is continuously tightened, the limiting cone 2 and the elastic expansion tube 5 sink into the countersunk hole of the welding jig 200. At this time, the limiting cone 2 resists the elastic expansion tube 5 and deforms. At this time, the elastic expansion tube 5 produces radial expansion and fits tightly against the inner wall of the countersunk hole of the welding jig 200, forming friction self-locking, thereby increasing the stability of the locating pin installation.

[0083] Embodiment 5: A combined positioning pin, referring to Figure 12 and Figure 13 The difference between this embodiment 1 and embodiment 4 is that: the positioning pin also includes a plurality of growth studs 6, and the plurality of growth studs 6 are coaxially detachably connected in sequence, the growth studs 6 are coaxially arranged with the fixed studs 3, the growth studs 6 are located along the axial direction of the fixed studs 3 at the end of the fixed studs 3 away from the limiting cone 2, the fixed studs 3 are detachably connected with the adjacent growth studs 6, and the diameter of the growth studs 6 is the same as the diameter of the fixed studs 3.

[0084] Since the lengthening stud 6 has the same diameter as the fixing stud 3 and is coaxially arranged, the lengthening stud 6 can extend the length of the fixing stud 3, thereby extending the length of the positioning pin. At the same time, the number of elastic deformation rings 51 can be increased to extend the length of the elastic expansion tube 5.

[0085] In this embodiment, refer to Figure 13 and Figure 14, one end of the growth stud 6 is coaxially provided with an extension post 61, and the other end is coaxially provided with an extension hole 62. The extension post 61 is inserted and fitted with the extension hole 62 of an adjacent growth stud 6.

[0086] Referring to Figure 14 and Figure 15 , a first pin hole 63 is penetratingly provided on the side wall of the extension post 61, and a second pin hole 64 is penetratingly provided on the side wall of the growth stud 6. The second pin hole 64 communicates with the extension hole 62. When the extension post 61 is inserted and fitted with the extension hole 62 of an adjacent growth stud 6, the first pin hole 63 and the corresponding second pin hole 64 are coaxially communicated, and a fixing pin 65 is inserted into the first pin hole 63 and the corresponding second pin hole 64.

[0087] The cooperative setting of the extension post 61, the extension hole 62 and the fixing pin 65 can realize the connection and fixation between two adjacent growth studs 6, and further realize the detachable connection between two adjacent growth studs 6.

[0088] In this embodiment, referring to Figure 14 and Figure 15 , one end of the fixing stud 3 along its own axis away from the limiting frustum 2 is also coaxially provided with an extension post 61. The extension post 61 on the fixing stud 3 is inserted and fitted with the extension hole 62 on the adjacent growth stud 6. At the same time, the first pin hole 63 on the fixing stud 3 and the second pin hole 64 on the adjacent growth stud 6 are coaxially communicated and a fixing pin 65 is inserted. This can realize the detachable connection between the fixing stud 3 and the adjacent growth stud 6.

[0089] Referring to Figure 12 and Figure 15 , an installation nut 7 is sleeved outside the fixing stud 3 or the growth stud 6. The installation nut 7 is screwed with the corresponding fixing stud 3 or growth stud 6. The elastic expansion tube 5 is axially located between the installation nut 7 and the limiting frustum 2, and one axial end of the elastic expansion tube 5 abuts against the installation nut 7 and the other end abuts against the limiting frustum 2.

[0090] The setting of the installation nut 7 can make the installation nut 7 abut against the elastic expansion tube 5 to deform when the installation nut 7 is screwed.

[0091] Referring to Figure 15 , when the installation hole for installing the positioning pin on the welding jig 200 is a through hole, at this time, by inserting the positioning pin into the corresponding installation hole and screwing the installation nut 7, the fixing of the positioning pin can be realized through the deformation of the elastic expansion tube 5, which can increase the installation method of the positioning pin and increase the versatility of the positioning pin.

[0092] Referring to Figure 12 and Figure 13, an internal hexagonal groove 22 is formed on the limiting frustum 2, and the connecting hole 21 is formed at the bottom of the internal hexagonal groove 22. Based on the formation of the internal hexagonal groove 22, the limiting frustum 2 can be fixed by inserting an internal hexagonal wrench into the internal hexagonal groove 22, which facilitates the screwing of the mounting nut 7 and thus the installation of the positioning pin.

[0093] The implementation principle of the embodiment of this application is as follows: When the mounting hole on the welding jig 200 is a through hole, first, the number of extension studs 6 and the number of elastic deformation rings 51 are increased or decreased according to the actual length of the through hole. Secondly, the docking plug 1 on the positioning pin is removed. Then, the positioning pin is inserted into the corresponding through hole. After that, a mounting nut 7 is sleeved on the corresponding extension stud 6 or fixed stud 3. At this time, an internal hexagonal wrench is inserted into the internal hexagonal groove 22 of the limiting frustum 2, and the mounting nut 7 is rotated and screwed by the wrench. At this time, the elastic expansion tube 5 is gradually deformed, and at this time, several elastic deformation rings 51 are deformed and expanded, thereby clamping the positioning pin in the corresponding through hole to ensure the stability of the positioning pin fixation. Finally, the required docking plug 1 is reinstalled onto the limiting frustum 2.

[0094] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A combined locating pin, characterized in that, include: A docking plug (1), a limiting truncated platform (2) and a fixing stud (3), wherein the docking plug (1), the limiting truncated platform (2) and the fixing stud (3) are coaxially connected in sequence; The limiting truncated cone (2) is threadedly connected to the docking plug (1); an elastic expansion ring (4) is arranged between the docking plug (1) and the limiting truncated cone (2); the elastic expansion ring (4) and the limiting truncated cone (2) are arranged coaxially; one axial end of the elastic expansion ring (4) abuts against the limiting truncated cone (2) and the other axial end abuts against the docking plug (1).

2. The combined locating pin according to claim 1, characterized in that, The docking plug (1) comprises a locking bolt (14), an introduction ring (12) and a plurality of intermediate rings (13); the locking bolt (14) is coaxially threaded with the limiting truncated cone (2); the introduction ring (12), the intermediate ring (13) and the elastic expansion ring (4) are all coaxially sleeved on the locking bolt (14); a plurality of the intermediate rings (13) are located between the introduction ring (12) and the elastic expansion ring (4); one axial end of the elastic expansion ring (4) abuts against an adjacent intermediate ring (13), and the other end abuts against the limiting truncated cone (2).

3. The combination positioning pin according to claim 2, wherein, The elastic expansion ring (4) is also provided between the introduction ring (12) and the adjacent intermediate ring (13), and between two adjacent intermediate rings (13).

4. The combined locating pin according to claim 2, wherein, Anti-rotation components (15) are provided between the introduction ring (12) and the adjacent intermediate ring (13), between two adjacent intermediate rings (13), and between the limiting truncated cone (2) and the adjacent intermediate ring (13). The anti-rotation components (15) are used to prevent the intermediate ring (13) from rotating relative to the corresponding intermediate ring (13) or the introduction ring (12) or the limiting truncated cone (2).

5. The combination locating pin according to claim 1, wherein, An elastic expansion tube (5) is coaxially sleeved outside the fixing stud (3), and one axial end of the elastic expansion tube (5) is in contact with the limiting truncated cone (2).

6. The combined locating pin according to claim 5, characterized in that, The fixing stud (3) is coaxially and detachably connected to a growth stud (6), and the fixing stud (3) is located between the limiting truncated cone (2) and the growth stud (6) along its own axial direction; A plurality of the growth studs (6) are provided, and the plurality of growth studs (6) are arranged in sequence along their own axial direction, and two adjacent growth studs (6) are coaxially detachably connected.

7. A combined positioning pin according to claim 6, characterized in that, A mounting nut (7) is sleeved on the outer side of the fixing stud (3) or the extending stud (6), and the mounting nut (7) is threadedly connected to the fixing stud (3) or the extending stud (6); One axial end of the elastic expansion tube (5) abuts against the mounting nut (7), and the other axial end abuts against the limiting truncated table (2).

8. A combined positioning pin according to claim 7, wherein, The limiting truncated cone (2) is provided with an inner hexagonal groove (22) along the axial direction of the limiting cone (2) on a side away from the fixing stud (3), and the inner hexagonal groove (22) is coaxially arranged with the fixing stud (3).

9. A combined locating pin according to claim 5, characterized in that, The elastic expansion tube (5) comprises a plurality of elastic deformation rings (51), wherein the elastic deformation rings (51) are coaxially sleeved on the outside of the fixing stud (3), and the plurality of elastic deformation rings (51) are arranged in sequence along their own axial direction.

10. A combined locating pin according to claim 9, characterized in that, Smooth layers (52) are provided on both axial sides of the elastic deformation ring (51).

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