Positioning device and riveting method

Abstract

The application discloses a riveting method of a positioning device. The positioning device comprises a sleeve, a pull rod, a tension ring and a driver. The pull rod is driven to slide in the through hole of the sleeve by the driver, so that the first taper surface on the limiting part of the pull rod is in sliding fit with the inner wall surface of the through hole. The pull rod extrudes the inner wall surface of the through hole through the first taper surface, so that the limiting part is expanded outward. The limiting part abuts against the bottom hole part of the mounting hole of the part. Meanwhile, the limiting part drives the tension ring sleeved on the outer side of the limiting part to expand outward. The tension ring abuts against the countersunk part of the mounting hole. Thus, the limiting part and the tension ring are combined to limit the part with the countersunk hole. The part is not prone to shaking through the outward expansion limiting mode. The positioning precision is high, and the riveting precision between the part and the riveted part can be improved.

Description

Technical Field

[0001] This application relates to the field of riveting auxiliary equipment technology, and in particular to a positioning device and riveting method. Background Technology

[0002] During the riveting process, the parts need to be positioned. For example, if the part is a timing pulley, the retaining ring needs to be riveted to the end face of the timing pulley. In related technologies, a positioning mandrel is inserted into the mounting hole of the timing pulley. In order to facilitate the insertion of the positioning mandrel into the mounting hole, the positioning mandrel and the mounting hole are clearance fit. During the riveting process, the timing pulley will wobble relative to the positioning mandrel, resulting in low riveting accuracy. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a positioning device that can fix parts by internal expansion, thereby improving positioning accuracy.

[0004] This application also proposes a riveting method having the above-mentioned positioning device.

[0005] The positioning device according to a first aspect embodiment of this application includes:

[0006] An expansion sleeve, one end of which is provided with a limiting part, the limiting part being used to pass through the mounting hole of the part, the expansion sleeve having a through hole penetrating the limiting part, the outer diameter of the limiting part being variable so as to abut against the inner wall surface of the bottom hole portion of the mounting hole;

[0007] A pull rod is movably inserted into the through hole, and a first conical surface is formed on the outer side of the pull rod. The first conical surface slides in contact with the inner wall of the through hole to adjust the outer diameter of the limiting part.

[0008] An expansion ring is detachably sleeved on the outside of the limiting portion, and the expansion ring is used to abut against the inner wall surface of the countersunk portion of the mounting hole;

[0009] A driver that drives the connecting rod to move the rod relative to the through hole.

[0010] The positioning device according to the first aspect of this application has at least the following advantages: the pull rod is driven by the driver to slide in the through hole of the expansion sleeve, so that the first conical surface on the limiting part of the pull rod slides and engages with the inner wall surface of the through hole. The pull rod presses the inner wall surface of the through hole through the first conical surface, so that the limiting part expands outward. The limiting part abuts against the bottom hole portion of the mounting hole of the part. At the same time, the limiting part drives the expansion ring sleeved on the outside of the limiting part to expand outward. The expansion ring abuts against the countersunk portion of the mounting hole. Thus, the limiting part and the expansion ring cooperate to limit the part with the countersunk hole. Furthermore, the outward expansion limiting method makes the part less prone to shaking, and the positioning accuracy is high, which can improve the riveting accuracy between the part and the riveting part.

[0011] According to some embodiments of this application, the two ends of the tightening ring are respectively formed with an abutment portion and a movable portion. The outer diameter of the abutment portion is larger than the outer diameter of the movable portion. The abutment portion is used to abut against the inner wall surface of the countersunk portion, and the movable portion is used to have a clearance fit with the inner wall surface of the countersunk portion.

[0012] According to some embodiments of this application, a second conical surface is formed on the outer side of the tightening ring, and the second conical surface is inclined toward the axis of the tightening ring along the direction from the abutment portion to the movable portion.

[0013] According to some embodiments of this application, the tensioning ring has multiple grooves that penetrate one end face of the tensioning ring.

[0014] According to some embodiments of this application, the limiting part has at least two through slots, one end of which penetrates the end face of the limiting part.

[0015] According to some embodiments of this application, a pad is also included, which is detachably connected to the expansion sleeve and is located on one side of the limiting portion for supporting the part.

[0016] According to some embodiments of this application, the expansion sleeve and the pull rod are detachably connected to the driver.

[0017] According to some embodiments of this application, the driver includes a base and a sliding sleeve, the sliding sleeve being movably disposed on the base, the base having a first air intake channel and a second air intake channel, the air outlet of the first air intake channel facing the upper end face of the sliding sleeve, and the air outlet of the second air intake channel facing the lower end face of the sliding sleeve; the pull rod is connected to the sliding sleeve, and the expansion sleeve is connected to the base.

[0018] According to some embodiments of this application, the driver further includes a rotary drive mechanism that drives the sliding sleeve to rotate relative to the base.

[0019] The riveting method according to the second aspect embodiment of this application, using the positioning device of the first aspect embodiment, further includes the following steps:

[0020] The part and the rivet are placed in the expansion sleeve, such that the limiting part of the expansion sleeve passes through the mounting hole of the part and through the rivet;

[0021] The expansion ring is sleeved on the outside of the limiting part, so that the expansion ring is located at the countersunk part of the mounting hole;

[0022] The driver drives the pull rod to move downward within the through hole of the expansion sleeve. The first conical surface of the pull rod slides against the inner wall surface of the through hole to push the limiting part to expand outward. The limiting part abuts against the inner wall surface of the bottom hole portion of the mounting hole. The outward expansion of the limiting part drives the expansion ring to expand outward. The expansion ring abuts against the inner wall surface of the countersunk portion of the mounting hole.

[0023] Riveted parts and riveted components.

[0024] The riveting method according to the second aspect of this application has at least the following beneficial effects: including all the beneficial effects of the positioning device of the first aspect embodiment, which will not be repeated here.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0027] Figure 1 This is a schematic diagram of the positioning device according to the first aspect of this application;

[0028] Figure 2 for Figure 1 Exploded view of the positioning device;

[0029] Figure 3 for Figure 1 A cross-sectional view of the positioning device;

[0030] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 This is a flowchart of a riveting method according to a second aspect of this application.

[0032] Figure label:

[0033] Expansion sleeve 100, limiting part 110, through groove 111, through hole 120, wedge groove 130;

[0034] Tie rod 200, first cone surface 210;

[0035] Expansion ring 300, contact part 310, movable part 320, second conical surface 330, groove 340;

[0036] Driver 400, base 410, first air intake channel 411, second air intake channel 412, sliding sleeve 420;

[0037] 500 spacers;

[0038] Positioning seat 600, positioning groove 610, fastening hole 620;

[0039] Part 700, mounting hole 710, countersunk part 711, bottom hole part 712;

[0040] Riveted parts 800. Detailed Implementation

[0041] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0042] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0044] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0045] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Reference Figures 1 to 4 The positioning device according to the first aspect of this application includes:

[0047] The expansion sleeve 100 has a limiting part 110 at one end. The limiting part 110 is used to pass through the mounting hole 710 of the part 700. The expansion sleeve 100 has a through hole 120 that passes through the limiting part 110. The outer diameter of the limiting part 110 is variable so that it can abut against the inner wall surface of the bottom hole portion 712 of the mounting hole 710.

[0048] A pull rod 200 is movably inserted into a through hole 120. A first conical surface 210 is formed on the outer side of the pull rod 200. The first conical surface 210 slides with the inner wall surface of the through hole 120 to adjust the outer diameter of the limiting part 110.

[0049] The tension ring 300 is detachably sleeved on the outside of the limiting part 110 and is used to abut against the inner wall surface of the countersunk part 711 of the mounting hole 710.

[0050] A driver 400 drives a connecting rod 200 to move relative to the through hole 120.

[0051] It is understood that the positioning device of this application is used to position the part 700 during the process of riveting the riveting part 800 onto the part 700. For example, the part 700 is a timing pulley, and the riveting part is a retaining ring, which needs to be riveted onto the end face of the timing pulley. The part 700 has a mounting hole 710, which is a countersunk hole with a countersunk portion 711 and a bottom hole portion 712. The upper end of the pull rod 200 forms a first conical surface 210, making the upper end of the pull rod 200 inverted conical shape. The lower end of the pull rod 200 passes through the through hole 120 through the expansion sleeve 100 and extends out of the lower end of the expansion sleeve 100 to connect with the driving end of the driver 400. In the initial state, when part 700 is not placed on the limiting part 110 of expansion sleeve 100, the upper end of pull rod 200 is outside the through hole 120 of expansion sleeve 100, so that the outer diameter of expansion sleeve 100 is in a small state, so as to facilitate the placement of part 700 and riveting part 800 on expansion sleeve 100. Subsequently, part 700 and riveting part 800 are placed on the limiting part 110 of expansion sleeve 100, so that the limiting part 110 passes through the mounting hole 710 of part 700 and through riveting part 800. At this time, the distance between the limiting part 110 and the bottom hole portion 712 of mounting hole 710 is small, and the distance between the limiting part 110 and the countersunk portion 711 of mounting hole 710 is large. Next, the driver 400 drives the pull rod 200 to move downward along the through hole 120. The upper end of the pull rod 200, which has a first conical surface 210, enters the through hole 120. The first conical surface 210 slides and engages with the inner wall of the through hole 120. The first conical surface 210 is smaller at the bottom and larger at the top. As the pull rod 200 moves downward, the limiting part 110 gradually penetrates deeper into the through hole 120. The first conical surface 210 gradually pushes the limiting part 110 outward, and the limiting part 110 abuts against the inner wall of the bottom hole portion 712. At the same time, the limiting part 110 drives the outer expansion ring 300 to expand outward, and the expansion ring 300 abuts against the inner wall of the countersunk portion 711. Thus, the limiting part 110, in conjunction with the expansion ring 300, performs internal expansion positioning of the part 700. Then, the riveting part 800 and the part 700 can be riveted together using a riveting device. After riveting is completed, the driver 400 drives the pull rod 200 to move upward, and the part of the pull rod 200 with the first conical surface 210 exits the through hole 120, and the limiting part 110 returns to its original outer diameter size under its own elastic force.

[0052] In summary, the actuator 400 drives the pull rod 200 to slide within the through hole 120 of the expansion sleeve 100, allowing the first conical surface 210 on the limiting part 110 of the pull rod 200 to slide against the inner wall surface of the through hole 120. The pull rod 200 presses against the inner wall surface of the through hole 120 through the first conical surface 210, causing the limiting part 110 to expand outward. The limiting part 110 abuts against the bottom hole portion 712 of the mounting hole 710 of the part 700. At the same time, the limiting part... Part 110 drives the expansion ring 300 sleeved on the outside of the limiting part 110 to expand outward. The expansion ring 300 abuts against the countersunk portion 711 of the mounting hole 710. Thus, the limiting part 110 and the expansion ring 300 cooperate to limit the part 700 with the countersunk hole. Furthermore, by expanding and limiting outward, the part 700 is not easy to shake, the positioning accuracy is high, and the riveting accuracy between the part 700 and the riveting part 800 can be improved.

[0053] Specifically, the inner wall surface of the portion of the through hole 120 corresponding to the limiting part 110 is also conical, but the inclination of the inner wall surface of the through hole 120 is less than the inclination of the first conical surface 210.

[0054] Of course, in other embodiments, part 700 can also be a wheel hub, riveting part 800 can be a wheel rim, part 700 can be a caster wheel, and riveting part 800 can be a dust cover; there are no restrictions here.

[0055] In other embodiments, the portion of the pull rod 200 having the first conical surface 210 may be the middle part of the pull rod 200 or other positions, as long as the first conical surface 210 can slide and engage with the inner wall surface of the through hole 120 during the sliding process of the pull rod 200 in the through hole 120, and the limiting part 110 expands outward. There is no limitation here.

[0056] It should also be understood that during the riveting process, the riveting equipment applies a force to the riveting part 800 toward the axis of the part 700 so that the riveting part 800 and the part 700 are riveted together. During this process, the mounting hole 710 of the part 700 tends to shrink inward. Thus, the part 700 can be supported from inside the mounting hole 710 by means of the limiting part 110 and the expansion ring 300 expanding inward, so as to reduce the degree of deformation of the mounting hole 710.

[0057] It should be noted that the riveting position of the riveting part 800 is at the upper end face of the part 700, that is, at the countersunk portion 711 corresponding to the mounting hole 710 in the horizontal direction. During the riveting process, the countersunk portion 711 of the part 700 will be subjected to a large force in the axial direction, resulting in a tight connection between the inner wall surface of the countersunk portion 711 and the outer side of the tightening ring 300. Since the tightening ring 300 is relatively small, there is a problem that the tightening ring 300 is not easy to remove from the countersunk portion 711. In order to facilitate the removal of the tightening ring 300 after riveting, in some embodiments, refer to... Figure 3 and Figure 4The two ends of the tensioning ring 300 are respectively formed with an abutment portion 310 and a movable portion 320. The outer diameter of the abutment portion 310 is larger than the outer diameter of the movable portion 320. The abutment portion 310 is used to abut against the inner wall surface of the countersunk portion 711, and the movable portion 320 is used to have a clearance fit with the inner wall surface of the countersunk portion 711.

[0058] Understandably, the upper end of the tightening ring 300 is provided with an abutment portion 310, and the lower end of the tightening ring 300 is provided with a movable portion 320. When the limiting portion 110 causes the tightening ring 300 to expand outward, the abutment portion 310 with a larger outer diameter can abut against the inner wall surface of the countersunk portion 711, while the movable portion 320 with a smaller outer diameter has a clearance fit with the inner wall surface of the countersunk portion 711, that is, a gap is formed between it and the inner wall surface of the countersunk portion 711. After riveting is completed, due to the clearance fit between the movable portion 320 of the tightening ring 300 and the inner wall surface of the countersunk portion 711, the contact area between the outer side of the tightening ring 300 and the inner wall surface of the countersunk portion 711 is reduced, so that the tightening ring 300 can be easily removed from the countersunk portion 711.

[0059] It should also be understood that the horizontal position of the riveting part 800 corresponds to the horizontal position of the abutment part 310, thereby ensuring the supporting effect of the tightening ring 300 on the part 700.

[0060] Regarding the formation of the contact portion 310 and the movable portion 320 of the tensioning ring 300, in some embodiments, refer to Figure 2 and Figure 4 A second conical surface 330 is formed on the outer side of the tension ring 300. The second conical surface 330 is inclined toward the axis of the tension ring 300 along the direction from the abutment portion 310 to the movable portion 320.

[0061] Understandably, the second conical surface 330 makes the expansion ring 300 inverted conical shape, so that the outer diameter of the end of the expansion ring 300 with the abutment portion 310 is larger, and the outer diameter of the end of the expansion ring 300 with the movable portion 320 is smaller.

[0062] Of course, in some other embodiments, the tightening ring 300 may also be generally in the shape of a stepped cylinder.

[0063] To facilitate the expansion of the tightening ring 300 along with the limiting portion 110, in some embodiments, referring to... Figure 2 The tension ring 300 has multiple grooves 340, which penetrate one end face of the tension ring 300.

[0064] It is understandable that by creating grooves 340 that penetrate one end face of the expansion ring 300, the deformability of the expansion ring 300 is improved, allowing the expansion ring 300 to expand more effectively when the limiting part 110 expands outward. Specifically, the expansion ring 300 has an even number of grooves 340, which are distributed along the circumference of the expansion ring 300. The grooves 340 penetrating the upper end face of the expansion ring 300 and the grooves 340 penetrating the lower end face of the expansion ring 300 are staggered, further improving the deformability of the expansion ring 300.

[0065] Of course, in some other embodiments, the tension ring 300 may also be formed with circumferentially distributed corrugated grooves to improve the deformation capacity of the tension ring 300.

[0066] Regarding the method of deformation of the outer diameter of the limiting part 110, in some embodiments, refer to Figure 2 The limiting part 110 has at least two through slots 111, one end of which penetrates the end face of the limiting part 110.

[0067] Understandably, the limiting part 110 improves its deformability by providing multiple through grooves 111 that penetrate its end face. This facilitates the outward expansion of the limiting part 110 when the first conical surface 210 of the pull rod 200 slides relative to the inner wall of the through hole 120. Specifically, four through grooves 111 are provided, distributed along the circumference of the limiting part 110, and penetrating the upper end of the limiting part 110.

[0068] Of course, in some other embodiments, the limiting part 110 may also be made of an elastic material, relying on its own elastic expansion and rebound.

[0069] It should be noted that the riveting component 800 is riveted to the upper end of the part 700, and the upper end of the part 700 is the stress point. Different parts 700 have different heights. To accommodate parts 700 of different heights, in some embodiments, reference is made to... Figure 1 and Figure 2 The positioning device of this application also includes a pad 500, which is detachably connected to the expansion sleeve 100 and is located on one side of the limiting part 110 for supporting the part 700.

[0070] It is understandable that by using pads 500 of different heights to adapt to and support parts 700 of different heights, the upper end of part 700 is aligned with the upper end of limiting part 110, ensuring that limiting part 110 and tension ring 300 correspond to the riveting position of riveting part 800 relative to part 700 in the horizontal position, thus ensuring the support and limiting effect of limiting part 110 and tension ring 300.

[0071] Specifically, to facilitate the installation of the 500 pad, refer to... Figure 2 and Figure 3 The positioning device of this application also includes a positioning seat 600, which is disposed at the upper end of the driver 400. The expansion sleeve 100 is detachably inserted into the upper end of the positioning seat 600. The lower end of the pull rod 200 passes through the expansion sleeve 100 and the positioning seat 600 in sequence to connect with the driving end of the driver 400. The pad 500 is in the shape of a hollow cylinder and is sleeved on the outside of the expansion sleeve 100. The expansion sleeve 100 positions the pad 500. The pad 500 is placed on the positioning seat 600 and is located between the limiting part 110 of the expansion sleeve 100 and the positioning seat 600. The upper end of the pad 500 is used to support the part 700. By adjusting the height of the pad 500, the horizontal position of the upper end surface of the part 700 supported by the pad 500 relative to the limiting part 110 can be adjusted.

[0072] Furthermore, the expansion sleeve 100 and the positioning seat 600 are detachably connected, as shown in the following figure. Figure 4 The positioning seat 600 has a positioning groove 610 along the axial direction. The lower end of the expansion sleeve 100 passes through the positioning groove 610. The positioning seat 600 has a fastening hole 620 extending in the horizontal direction, which connects to the positioning groove 610. The expansion sleeve 100 has a wedge-shaped groove 130 in the circumferential direction corresponding to the fastening hole 620. Fasteners can pass through the fastening hole 620 and are engaged in the wedge-shaped groove 130 to fix the positioning seat 600 and the expansion sleeve 100 to each other, thereby facilitating the installation between the positioning seat 600 and the expansion sleeve 100.

[0073] Of course, in some other embodiments, the positioning seat 600 may not be provided, and the pad 500 may be directly fixed on the expansion sleeve 100 or fixed on the driver 400. Alternatively, the pad 500 may be set to other shapes, and the pad 500 may be detachably connected to the positioning seat 600, and the position of the pad 500 may be positioned by the positioning seat 600.

[0074] To accommodate parts 700 with mounting holes 710 of different sizes, in some embodiments, reference is made to... Figure 2 The expansion sleeve 100 and the pull rod 200 are detachably connected to the driver 400.

[0075] It is understandable that by replacing the expansion sleeve 100 with a limiting part 110 having a different outer diameter and the pull rod 200 with a different outer diameter, it is possible to adapt the part 700 with a mounting hole 710 of a different size.

[0076] Regarding the manner in which the drive lever 200 slides relative to the through hole 120, in some embodiments, refer to... Figure 3The driver 400 includes a base 410 and a sliding sleeve 420. The sliding sleeve 420 is movably disposed on the base 410. The base 410 has a first air intake channel 411 and a second air intake channel 412. The air outlet of the first air intake channel 411 faces the upper end face of the sliding sleeve 420, and the air outlet of the second air intake channel 412 faces the lower end face of the sliding sleeve 420. The pull rod 200 is connected to the sliding sleeve 420, and the expansion sleeve 100 is connected to the base 410.

[0077] Understandably, the expansion sleeve 100, as the driving end of the driver 400, can slide up and down relative to the fixed seat 410. When air enters through the first air intake channel 411, the air outlet of the first air intake channel 411 blows air toward the upper end face of the sliding sleeve 420, causing the sliding sleeve 420 to move down. The sliding sleeve 420 drives the pull rod 200 to move down, thereby causing the first conical surface 210 of the pull rod 200 to push the inner wall surface of the through hole 120 of the expansion sleeve 100. The limiting part 110 of the expansion sleeve 100 expands outward to abut against the mounting hole 710 of the part 700, thus limiting the part 700. When air is introduced into the second air intake channel 412, the air outlet of the second air intake channel 412 blows air towards the lower end face of the sliding sleeve 420, causing the sliding sleeve 420 to move upward. The sliding sleeve 420 drives the pull rod 200 to move upward, so that the part of the pull rod 200 with the first conical surface 210 leaves the through hole 120. The limiting part 110 of the expansion sleeve 100 rebounds, thereby canceling the contact with the mounting hole 710 of the part 700 and releasing the limiting of the part 700. It should be understood that by using pneumatic means to make the sliding sleeve 420 float up and down, there is a certain buffering effect during the process of the pull rod 200 driving the limiting part 110 to expand outward. After the limiting part 110 and the expansion ring 300 are tightly abutted against the inner wall of the mounting hole 710, the airflow cannot drive the sliding sleeve 420 to continue to move downward, thus preventing the limiting part 110 and the expansion ring 300 from crushing the part 700. Furthermore, the pull rod 200 is threadedly connected to the sliding sleeve 420 so that the pull rod 200 and the sliding sleeve 420 can be easily disassembled and assembled.

[0078] Specifically, the driver 400 also includes a gas generating mechanism, which is connected to the air inlet of the first air inlet channel 411 and the air inlet of the second air inlet channel 412.

[0079] Of course, in some other embodiments, the actuator 400 may also include a cylinder, the drive end of which is connected to the lower end of the lever 200.

[0080] To improve the riveting effect, in some embodiments, the driver 400 further includes a rotary drive mechanism (not shown in the figure), which drives the connecting sleeve 420 to rotate relative to the seat 410.

[0081] Understandably, the rotary drive mechanism drives the sliding sleeve 420 to rotate, the sliding sleeve 420 drives the pull rod 200 to rotate, the pull rod 200 drives the expansion sleeve 100 to rotate, thereby driving the part 700 and the riveting part 800 to rotate, so that the part 700 and the riveting part 800 are subjected to uniform force, thereby improving the riveting quality.

[0082] Specifically, the pad 500 and the positioning seat 600 will also rotate relative to the seat 410.

[0083] Reference Figure 5 According to the riveting method of the second aspect embodiment of this application, using the positioning device of the first aspect embodiment, the method further includes the following steps:

[0084] S100, part 700 and riveting member 800 are placed in expansion sleeve 100, so that the limiting part 110 of expansion sleeve 100 passes into the mounting hole 710 of part 700 and through riveting member 800.

[0085] It is understandable that part 700 is a wheel structure, such as a timing pulley, and riveting part 800 is a retaining ring. The retaining ring needs to be riveted to the end face of the timing pulley. The timing pulley is placed horizontally on the expansion sleeve 100, and the limiting part 110 of the expansion sleeve 100 passes through the timing pulley and the retaining ring.

[0086] It should be understood that, in order to ensure that the riveting position of part 700 corresponds to the horizontal position of the limiting part 110 of expansion sleeve 100, before part 700 and riveting part 800 are placed on expansion sleeve 100, a pad 500 can be placed on the outside of expansion sleeve 100, and part 700 can be placed on pad 500. The pad 500 supports part 700 so that the riveting position of part 700, that is, the horizontal height of the placement of riveting part 800 relative to part 700, corresponds to the limiting part 110.

[0087] S200 and the tension ring 300 are sleeved on the outside of the limiting part 110, so that the tension ring 300 is located at the countersunk part 711 of the mounting hole 710.

[0088] It is understood that the mounting hole 710 is a countersunk hole, with a countersunk portion 711 and a bottom hole portion 712 connected together. The limiting portion 110 passes through the countersunk portion 711 and the bottom hole portion 712. The distance between the limiting portion 110 and the bottom hole portion 712 is small. After the limiting portion 110 expands outward, the distance between the limiting portion 110 and the countersunk portion 711 becomes larger. The limiting portion 110 can abut against the inner wall surface of the bottom hole portion 712 but cannot abut against the inner wall surface of the countersunk portion 711. Therefore, by fitting an expansion ring 300 on the outside of the limiting portion 110, the expansion ring 300 corresponds to the countersunk portion 711. The expansion ring 300 can expand outward with the limiting portion 110. When the expansion ring 300 expands outward, it can abut against the countersunk portion 711.

[0089] S300, the driver 400 drives the pull rod 200 to move downward in the through hole 120 of the expansion sleeve 100. The first conical surface 210 of the pull rod 200 slides and engages with the inner wall surface of the through hole 120 to push the limiting part 110 to expand outward. The limiting part 110 abuts against the inner wall surface of the bottom hole portion 712 of the mounting hole 710. The expansion of the limiting part 110 drives the expansion ring 300 to expand outward. The expansion ring 300 abuts against the inner wall surface of the countersunk portion 711 of the mounting hole 710.

[0090] Understandably, the driver 400 drives the pull rod 200 to move downward relative to the expansion sleeve 100. The first conical surface 210 of the pull rod 200 enters the through hole 120. Since the first conical surface 210 of the pull rod 200 is larger at the top and smaller at the bottom, as the pull rod 200 goes deeper into the through hole 120, the first conical surface 210 slides against the inner wall of the through hole 120. At the same time, the first conical surface 210 squeezes and pushes the inner wall of the through hole 120, so that the limiting part 110 of the expansion sleeve 100 expands outward. The limiting part 110 abuts against the inner wall of the bottom hole part 712. While the limiting part 110 expands outward, it can drive the tightening ring 300 to expand outward. The tightening ring 300 abuts against the inner wall of the countersunk part 711, thereby playing a positioning role for the part 700 and the riveting part 800.

[0091] S400, riveting parts 700 and riveting components 800.

[0092] Understandably, after the part 700 and the riveting part 800 are positioned by the expansion sleeve 100 and the tightening ring 300, the riveting part 800 is riveted to the part 700. Since the expansion sleeve 100 and the tightening ring 300 position the part 700 by internally expanding and abutting against the inner wall surface of the mounting hole 710 of the part 700, the part 700 is not easy to shake, the positioning accuracy is high, and the riveting quality is good. Furthermore, the expansion sleeve 100 and the tightening ring 300 provide internal support, which can reduce the inward shrinkage and deformation of the mounting hole 710.

[0093] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A positioning device, characterized in that, include: An expansion sleeve (100) is provided at one end with a limiting part (110), the limiting part (110) is used to pass through the mounting hole (710) of the part (700), the expansion sleeve (100) is formed with a through hole (120) through the limiting part (110), and the outer diameter of the limiting part (110) is variable so as to abut against the inner wall surface of the bottom hole portion (712) of the mounting hole (710); A pull rod (200) is movably inserted into the through hole (120). A first conical surface (210) is formed on the outer side of the pull rod (200). The first conical surface (210) slides with the inner wall of the through hole (120) to adjust the outer diameter of the limiting part (110). A tension ring (300) is detachably sleeved on the outside of the limiting part (110), and the tension ring (300) is used to abut against the inner wall surface of the countersunk part (711) of the mounting hole (710). A driver (400) drives the connecting rod (200) to move the rod (200) relative to the through hole (120); The expansion ring (300) has an abutment portion (310) and a movable portion (320) at its two ends, respectively. The outer diameter of the abutment portion (310) is larger than the outer diameter of the movable portion (320). The abutment portion (310) is used to abut against the inner wall surface of the countersunk portion (711), and the movable portion (320) is used to have a clearance fit with the inner wall surface of the countersunk portion (711). A second conical surface (330) is formed on the outer side of the expansion ring (300). The second conical surface (330) is inclined towards the axis of the expansion ring (300) along the direction from the abutment portion (310) to the movable portion (320). The driver (400) includes a base (410) and a sliding sleeve (420). The sliding sleeve (420) is movably disposed on the base (410). The base (410) has a first air intake channel (411) and a second air intake channel (412). The air outlet of the first air intake channel (411) faces the upper end face of the sliding sleeve (420), and the air outlet of the second air intake channel (412) faces the lower end face of the sliding sleeve (420). The pull rod (200) is connected to the sliding sleeve (420), and the expansion sleeve (100) is connected to the base (410).

2. The positioning device according to claim 1, characterized in that, The expansion ring (300) has multiple grooves (340) that penetrate one end face of the expansion ring (300).

3. The positioning device according to claim 1, characterized in that, The limiting part (110) has at least two through slots (111), one end of which penetrates the end face of the limiting part (110).

4. The positioning device according to claim 1, characterized in that, It also includes a pad (500) which is detachably connected to the expansion sleeve (100) and is located on one side of the limiting part (110) for supporting the part (700).

5. The positioning device according to claim 1, characterized in that, The expansion sleeve (100) and the pull rod (200) are detachably connected to the driver (400).

6. The positioning device according to claim 1, characterized in that, The driver (400) further includes a rotary drive mechanism that drives the sleeve (420) to rotate relative to the seat (410).

7. A riveting method, characterized in that, The positioning device according to any one of claims 1 to 6 further includes the following steps: The part (700) and the rivet (800) are placed in the expansion sleeve (100) such that the limiting part (110) of the expansion sleeve (100) passes into the mounting hole (710) of the part (700) and through the rivet (800). The expansion ring (300) is sleeved on the outside of the limiting part (110), so that the expansion ring (300) is located at the countersunk part (711) of the mounting hole (710); The driver (400) drives the pull rod (200) to move downward in the through hole (120) of the expansion sleeve (100). The first conical surface (210) of the pull rod (200) slides with the inner wall surface of the through hole (120) to push the limiting part (110) to expand outward. The limiting part (110) abuts against the inner wall surface of the bottom hole portion (712) of the mounting hole (710). The expansion of the limiting part (110) drives the expansion ring (300) to expand outward. The expansion ring (300) abuts against the inner wall surface of the countersunk portion (711) of the mounting hole (710). Riveting parts (700) and riveting components (800).

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