A device and method for screwing blind rivets

Abstract

The present invention belongs to the field of blind rivets, and discloses a device and method for screwing blind rivets, wherein the screwing device comprises a primary screwing assembly, a secondary screwing assembly and a tertiary screwing assembly; the primary screwing assembly combines a core rod, a tube body on a tube body carrier, and a nail body on a nail body carrier into a semi-finished product 1; the secondary screwing assembly screws the semi-finished product 1 into a semi-finished product 2; and the tertiary screwing assembly screws the semi-finished product 2 into a prefabricated product. The present invention divides the primary screwing process into three times, and can improve the efficiency of the screwing process on the basis of avoiding screwing jam.

Description

Technical Field

[0001] The invention belongs to the field of blind rivets, and in particular relates to a device and method for screwing blind rivets. Background Art

[0002] Blind rivets are a type of rivet used for single-sided riveting, especially suitable for occasions where it is inconvenient to rivet from both sides. Usually, blind rivets are assembled by manual assembly. With the development of science and technology, assembly equipment for blind rivets has gradually appeared.

[0003] Existing assembly equipment usually completes the screwing in one go. The stroke length of the core rod in the screwing process is relatively long, so the screwing process takes a long time, causing other processes to have to wait for a long time, which in turn affects the overall production efficiency. Increasing the screwing speed can shorten the time consumed in the screwing process, but it will cause jamming, affecting the processing quality and performance of the rivet, resulting in a low yield rate. Summary of the invention

[0004] In order to solve the above technical problems, the present invention discloses a screwing device for blind rivets, which divides one screwing process into three times, thereby avoiding screwing jam and improving the efficiency of the screwing process. The present invention also discloses a screwing method for blind rivets.

[0005] The specific technical solutions of the present invention are as follows:

[0006] A screwing device for a blind rivet, comprising a primary screwing assembly, a secondary screwing assembly and a tertiary screwing assembly;

[0007] The one-time twisting assembly comprises a nail body carrier, a tube body carrier and a twisting mechanism 1, wherein the nail body carrier, the tube body carrier and the twisting mechanism 1 are arranged in sequence along a first straight line, the twisting mechanism 1 is used to clamp the first end of the core rod to drive the core rod to rotate around its axis, the twisting mechanism 1, the nail body carrier and the tube body carrier cooperate along the first straight line to combine the core rod, the tube body on the tube body carrier and the nail body on the nail body carrier into a semi-finished product 1, in which the second end of the core rod penetrates the tube body and extends into the nail body, and one end of the tube body assembly ring is tightly pressed against the shrinking end of the nail body;

[0008] The secondary twisting assembly comprises a second twisting mechanism and a secondary carrier, the secondary carrier is used to position and place the semi-finished product one, the second twisting mechanism is used to cooperate with the first end of the core rod to drive the core rod to rotate around its axis, the second twisting mechanism and the secondary carrier cooperate along the axis of the semi-finished product one to twist the semi-finished product one into a semi-finished product two, in which the broken neck groove of the core rod is inserted into the tube body and the broken neck groove does not enter the nail body, and the second end of the core rod passes through the nail body;

[0009] The three-time twisting assembly includes a twisting mechanism three and a three-time carrier, the three-time carrier is used to position and place the semi-finished product two, the twisting mechanism three is used to clamp the second end of the core rod to drive the core rod to rotate around its axis, the twisting mechanism three and the three-time carrier cooperate along the axis of the semi-finished product two to twist the semi-finished product two into a prefabricated product, in which the broken neck groove of the core rod is inserted into the nail body, and the first end of the core rod is abutted against the end of the tube body.

[0010] In the prior art, the screwing of the blind rivet is achieved through a one-time process. Since the screwing stroke of the core rod is long, the screwing efficiency is usually low. On this basis, in order to improve the screwing efficiency, it can only be achieved by speeding up the screwing, which will increase the probability of jamming and thus reduce the yield rate. Therefore, in order to improve the manufacturing efficiency of the preform, it is necessary to take into account the screwing speed of the core rod and prevent jamming. Therefore, the present application divides the screwing process into three stages, so that in each screwing stage, the screwing stroke can be reduced, so the probability of jamming is greatly reduced, and the screwing can be further accelerated. Therefore, the screwing time of the three stages can be lower than the time required for one screwing, thereby ensuring the processing quality of the blind rivet, significantly improving the processing quality and efficiency, and effectively improving the yield rate.

[0011] Preferably, the nail body carrier, the secondary carrier, and the tertiary carrier all include a press-fitting mechanism for positioning and matching the nail body;

[0012] The press-fitting mechanism comprises:

[0013] A carrier, used for placing the nail body;

[0014] The clamping grip can be switched between the clamping position and the loosening position to clamp the nail body onto the carrier.

[0015] At the first twisting assembly, the nail body is used as a positioning device, and the tube body and the core rod are moved along the first straight line, so that the screwing of the semi-finished product one can be well completed; at the second twisting assembly, the nail body in the semi-finished product one is used as a positioning device, and after the core rod is twisted, the screwing of the semi-finished product two can be well achieved; at the third twisting assembly, the nail body in the semi-finished product two is used as a positioning device, and after the core rod is twisted, the screwing of the preform can be well achieved; in the above process, the pressing grip can well limit the axial position of the nail body, thereby satisfying the process positioning of each twisting stage and ensuring that the products at each stage have a good yield rate.

[0016] Preferably, a groove portion 1 for matching with the outer circumferential surface of the nail body is provided on the carrier, and a groove portion 2 for matching with the brim of the nail body is provided on one side of the groove portion 1.

[0017] By utilizing the special structure of the nail body, the positioning of the nail body can be well achieved, so when combined with the pressing and grasping, the stability of the twisting can be ensured, thereby ensuring the yield rate of the products at each stage.

[0018] Preferably, the twisting mechanism 1, the twisting mechanism 2 and the twisting mechanism 3 have torque sensors for detecting whether the twisting action is stuck.

[0019] The torque sensor can detect the screwing stability in real time and stop the loss in advance through instant judgment.

[0020] Preferably, the tube body carrier switches between a loading position and a screwing position that cooperates with the nail body carrier;

[0021] Also includes:

[0022] Detection mechanism one, the detection mechanism one is arranged between the loading position and the screwing position, and is used to detect whether a ring is installed in the pipe body.

[0023] For blind rivets, a ring should be pre-installed in the tube body. The ring can achieve self-locking for the blind rivet to ensure the stability of the riveting. Therefore, the ring is an indispensable component, and it is necessary to judge whether there is a ring before screwing.

[0024] Preferably, the three-twist assembly further comprises:

[0025] The tightening mechanism cooperates with the first end of the core rod to push the core rod to move along its axis while the twisting mechanism drives the core rod to rotate.

[0026] In a three-time screwing assembly, the screwing of the preform can usually be completed when the screwing mechanism drives the core rod to rotate, but the efficiency is low and the stability is not high. Therefore, a tightening mechanism is provided to push the core rod while the screwing mechanism is screwing, thereby ensuring that the thread feed between the core rod and the nail body is more stable, thereby further ensuring the stability of the screwing of the preform.

[0027] Preferably, the tightening mechanism comprises:

[0028] A push driving mechanism, the push driving mechanism moves axially along the core rod to exert a push action;

[0029] A push piece is rotatably arranged on the push drive mechanism, and is used to abut against the first end of the core rod so as to rotate with the core rod when pushing the core rod. The push piece can achieve positioning and abutment against the core rod, thereby creating structural conditions for pushing the core rod, and in the twisting process, in order to prevent the core rod from being twisted off, the push piece is configured to rotate with the core rod, thereby better ensuring the pushing stability and twisting stability.

[0030] Preferably, the three-time twisting assembly is also provided with a second detection mechanism for detecting the position information of the first end of the core rod in the preform on the three-time carrier. In the process of pushing the core rod to move, the tightening mechanism detects the relative position between the broken neck groove and the nail body / tube body through the second detection mechanism to determine whether the broken neck groove is located at the preset position; the broken neck groove does not enter the nail body in the semi-finished product two, that is, the last stage of the twisting stroke is reserved. In the last stroke stage, the broken neck groove is placed in the nail body by pushing while twisting, so as to avoid jamming and improve efficiency while ensuring the twisting speed.

[0031] Preferably, a through hole is provided through the rotation axis of the push member, so that the second detection mechanism can detect the position information of the first end of the core rod through the through hole.

[0032] The structure is simple and can quickly realize the detection function of the second detection mechanism.

[0033] A method for screwing a blind rivet, using the blind rivet screwing device as described above, comprises the following steps:

[0034] The axes of the core rod, the tube body and the nail body are arranged along a first straight line in section one;

[0035] The first end of the core rod is clamped to rotate the core rod, and the core rod, the tube body, and the nail body are relatively matched and moved on the first straight line, so that the core rod, the tube body, and the nail body are screwed together into a semi-finished product 1, in which the second end of the core rod penetrates the tube body and extends into the nail body, and one end of the tube body assembly ring is tightly pressed against the shrinking end of the nail body;

[0036] In the second working section, the semi-finished product 1 is positioned and placed, and the core rod is screwed to screw the semi-finished product 1 into the semi-finished product 2, in which the broken neck groove of the core rod is inserted into the tube body and the broken neck groove does not enter the nail body, and the second end of the core rod passes through the nail body;

[0037] In the third stage, the semi-finished product 2 is positioned and placed, and the core rod is screwed to screw the semi-finished product 2 into a preform. In the preform, the broken neck groove of the core rod is inserted into the nail body, and the first end of the core rod is against the end of the tube body.

[0038] Preferably, in the first working section, the core rod is screwed forward and backward to screw the core rod, the tube body and the nail body into a semi-finished product.

[0039] Preferably, in the third stage, the second end of the core rod is clamped to rotate the core rod, and the core rod is pushed at the first end of the core rod to be screwed into the preform.

[0040] Compared with the prior art, the present invention can effectively improve the screwing efficiency of the blind rivet and avoid jamming during the screwing process. Compared with the screwing process of the one-time formed preformed product, it not only improves the product assembly processing efficiency, but also can avoid or reduce the occurrence of jamming, thereby making the yield rate higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of an embodiment of the present invention;

[0042] Figure 2 It is a schematic diagram of the arrangement of the clamping mechanism 1, the clamping mechanism 4, and the clamping mechanism 5 in the embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of the arrangement of the double-station transfer of the tube carrier in an embodiment of the present invention;

[0044] Figure 4 for Figure 3 A top view of

[0045] Figure 5 This is a schematic diagram of one state of double-station transfer in an embodiment of the present invention;

[0046] Figure 6 is a schematic diagram of a clamping mechanism in an embodiment of the present invention;

[0047] Figure 7 for Figure 6 A magnified image of point A;

[0048] Figure 8 It is a cross-sectional view of a secondary twisting assembly and a tertiary twisting assembly in an embodiment of the present invention;

[0049] Fig. 9 for Figure 8 A magnified view of point B;

[0050] Fig.10 for Figure 8 Enlarged view of point C;

[0051] Fig.11 for Figure 8 The enlarged view of point D;

[0052] Fig.12 This is a schematic diagram of a semi-finished product 1 in an embodiment of the present invention;

[0053] Fig.13 This is a schematic diagram of a semi-finished product 2 in an embodiment of the present invention;

[0054] Fig.14 Schematic diagram of a preform in an embodiment of the present invention.

[0055] In the figure: 100-first twisting assembly; 200-second twisting assembly; 300-third twisting assembly; 400-core rod; 500-tube body; 501-ring; 600-nail body; 700-semi-finished product 1; 800-semi-finished product 2; 900-prefabricated product; 1-nail body carrier; 2-tube body carrier; 201-carrier 1; 202-carrier 2; 3-twisting mechanism 1; 4-twisting mechanism 2; 5-secondary carrier ;6-twisting mechanism three;7-three-time carrier;8-clamping mechanism one;9-clamping mechanism four;10-clamping mechanism five;11-sliding component;12-push-pull component;13-slide rail;14-track changing part;15-carrier;16-pressing grip;17-groove part one;18-groove part two;19-push member;20-bearing;21-detection mechanism two;22-reference surface;23-detection surface;24-detection mechanism one. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0057] like Figure 1 , Figure 12 to Figure 14As shown, a screwing device for a blind rivet includes a primary screwing assembly 100, a secondary screwing assembly 200 and a tertiary screwing assembly 300; the primary screwing assembly 100 includes a nail body carrier 1, a tube body carrier 2 and a screwing mechanism 3, the nail body carrier 1, the tube body carrier 2 and the screwing mechanism 3 are arranged in sequence along a first straight line, the screwing mechanism 3 is used to clamp the first end of the core rod 400 to drive the core rod 400 to rotate around its axis, and the screwing mechanism 3, the nail body carrier 1, the tube body carrier 2 are arranged along the first straight line. The core rod 400, the tube body 500 on the tube body carrier 2, and the nail body 600 on the nail body carrier 1 are combined into a semi-finished product 700. In the semi-finished product 700, the second end of the core rod 400 penetrates the tube body 500 and extends into the nail body 600, and one end of the assembly ring 501 of the tube body 500 is tightly pressed against the shrinking end of the nail body 600; the secondary twisting assembly 200 includes a twisting mechanism 24 and a secondary carrier 5, and the secondary carrier 5 is used to position and place the semi-finished product 700. The second twisting mechanism 4 is used to cooperate with the first end of the core rod 400 to drive the core rod 400 to rotate around its axis. The second twisting mechanism 4 and the secondary carrier 5 cooperate along the axis of the semi-finished product 700 to screw the semi-finished product 700 into the second semi-finished product 800. In the semi-finished product 800, the broken neck groove of the core rod 400 is inserted into the tube body 500 and the broken neck groove does not enter the nail body 600, and the second end of the core rod 400 passes through the nail body 600; the third twisting assembly 300 includes a twisting mechanism The third mechanism 6 and the third carrier 7 are used to position and place the semi-finished product 2 800. The third twisting mechanism 6 is used to clamp the second end of the core rod 400 to drive the core rod 400 to rotate around its axis. The third twisting mechanism 6 and the third carrier 7 cooperate along the axis of the semi-finished product 2 800 to screw the semi-finished product 2 800 into a preform 900. In the preform 900, the neck breaking groove of the core rod 400 is inserted into the nail body 600, and the first end of the core rod 400 is abutted against the end of the tube body 500.

[0058] like Figure 1 and Figure 2 As shown, in this embodiment, the nail body 600 is transferred to the nail body carrier 1 through the clamping mechanism 1 8, the tube body 500 is transferred to the tube body carrier 2 through the clamping mechanism 2, and the core rod 400 is transferred to the twisting mechanism 1 3 through the clamping mechanism 3. The clamping mechanism 1 8, the clamping mechanism 2, and the clamping mechanism 3 have clamping claws to achieve component clamping. In this embodiment, the tube body carrier 2 can be switched between the loading position and the screwing position. That is to say, when the tube body carrier 2 is in the loading position, the tube body 500 can be loaded. When the tube body carrier 2 carries the tube body 500 to move to the screwing position, the semi-finished product 700 can be screwed. Figure 1 to Figure 5As shown, there can be multiple tube carriers 2 to realize multi-station transfer. In order to ensure the twisting efficiency, the tube carriers 2 of each station are switched between the loading position and the twisting position in sequence. That is, when one of the tube carriers 2 is at the loading position, the other tube carriers 2 move between the loading position and the twisting position, and / or move in the opposite direction, and / or one of the tube carriers 2 is at the twisting position, so that the movements of the tube carriers 2 of each station do not interfere with each other. Specifically, as Figure 3 As shown, the present embodiment is a double-station tube body 500 transfer, including two tube body carriers 2, which are switched in sequence between the loading position and the screwing position, and the tube body carrier 2 is provided with a sliding member 11 and a push-pull member 12, and the sliding member 11 and the push-pull member 12 are slidably connected, and the tube body carrier 2 is arranged on the push-pull member 12; it also includes two slide rails 13 arranged side by side and corresponding to the sliding members 11 one by one; wherein, a track changing portion 14 is provided on one side of any slide rail 13, and the push-pull member 12 moves along the track changing portion 14, so as to drive the tube body carrier 2 corresponding to the push-pull member 12 to avoid the other tube body carrier 2 during the reciprocating movement of the sliding member 11 at the head end and the end end of the slide rail 13; the two tube body carriers 2 are in the same position at the loading position and the screwing position. In this embodiment, the track-changing parts 14 corresponding to the two slideways are symmetrical to each other. For any track-changing part 14, its first end is close to the first end of the other track-changing part 14, its second end is close to the second end of the other track-changing part 14, and its main body between the first end and the second end is far away from the main body of the other track-changing part 14. Both ends of the main body and the first end and the second end are smoothly transitioned. In other words, the track-changing part 14 is roughly in the shape of a Chinese character "J", thereby meeting specific usage requirements. Figure 2 to Figure 5 As shown, the two tube carriers 2 are carrier one 201 and carrier two 202. In a preferred embodiment, when carrier one 201 is located at the loading position, carrier two 202 is located at the screwing position. After loading and screwing are completed, carrier one 201 moves along the slide rail 13 where it is located and switches to the screwing position, and carrier two 202 moves in the opposite direction along the slide rail 13 where it is located and switches to the loading position. In other words, carrier one 201 and carrier two 202 carry the tube body 500 in sequence for loading and screwing. When the carrier 1 201 and the carrier 2 202 switch motion at the same time, they move relative to each other under the drive of the corresponding push-pull member 12, so that when the carrier 1 201 and the carrier 2 202 move along the corresponding slide rail 13 at the same time, the carrier 1 201 and the carrier 2 202 move a distance in the direction perpendicular to the slide rail 13 and maintain, and return to the loading position or screwing position at the end of the slide rail 13. In other words, during the movement of the switching position, the carrier 1 201 and the carrier 2 202 will avoid each other in the direction perpendicular to the slide rail 13 and stay in the same position at the end of the slide rail 13. In this way, the tube body 500 can be loaded and screwed.

[0059] like Figure 1 , Figure 4 As shown, the nail body carrier 1, the secondary carrier 5, and the tertiary carrier 7 all include a pressing mechanism for positioning and matching the nail body 600; the pressing mechanism includes a carrier 15, and a pressing grip 16 that can be switched between a pressing position and a releasing position; the carrier 15 is used to place the nail body 600; the pressing grip 16 presses the nail body 600 onto the carrier 15. The pressing grip 16 is driven by a pneumatic device, and in order to avoid the pressing and releasing actions from interfering with the movement of other movable structures, there is a preset angle 1 between the pressing grip 16 in the pressing position and the pressing grip 16 in the releasing position. Taking the rotation plane of the pressing grip 16 as a reference, the position of the pressing grip 16 in the pressing position is lower than the position of the pressing grip 16 in the releasing position. Further, as Figure 6 to Figure 11 As shown, the carrier 15 is provided with a groove 17 for matching the outer circumferential surface of the nail body 600, and one side of the groove 17 is provided with a groove 2 18 for matching the cap edge of the nail body 600. The function of the press-fitting mechanism is to axially position the nail body 600 to avoid axial displacement of the nail body 600 during the screwing process, thereby affecting the forming of the screwing process. It is known that in the blind rivet, there is a threaded connection between the nail body 600 and the core rod 400. Therefore, when the nail body 600 is positioned, the core rod 400 is rotated, and the core rod 400 will move along the forming axis of the blind rivet to form a semi-finished product 1 700 or a semi-finished product 2 800 or a preform 900 that meets the requirements. It is known that if the nail body 600 also moves along the axis of the core rod 400 during the rotation of the core rod 400, then it will be impossible to produce a product that does not meet the requirements at this stage of the process. Of course, if the nail body 600 also rotates along the axis of the core shaft under the action of friction, it is also impossible to obtain a product that meets the requirements. Therefore, it is necessary to use a press-fitting mechanism to press the nail body 600 on the carrier 15 to limit the axial movement and circumferential rotation of the nail body 600. Therefore, in this embodiment, the provision of the groove part 2 18 can achieve axial limit on the nail body 600, and the use of the pressing grip 16 to achieve the limit of the circumferential rotation of the nail body 600. The pressing grip 16 also has a groove part 17 that matches the outer circumferential surface of the nail body 600, so that the nail body 600 can be well prohibited from rotating through friction.

[0060] In this embodiment, the twisting mechanism 1 3, the twisting mechanism 2 4, and the twisting mechanism 3 6 have a torque sensor for detecting whether the twisting action is stuck. In this embodiment, the twisting mechanism 1 3, the twisting mechanism 2 4, and the twisting mechanism 3 6 are rotatable pneumatic chucks, and the chuck structure is stable in clamping. The torque sensor is assembled by directly connecting the chuck to the torque sensor to reduce the force transmission loss. When the twisting mechanism 1 3, the twisting mechanism 2 4, and the twisting mechanism 3 6 twists the core rod 400, the torque sensor is used to monitor the resistance during twisting, so as to determine whether the core rod 400 is stuck, and whether the core rod 400 is aligned with the axis of the nail body 600, so as to avoid twisting jams caused by deflection, ensure smooth assembly to obtain the blind rivet, and ensure that the blind rivet can be used normally in the later stage, and avoid jams that make it difficult to effectively play the role of riveting and fixing.

[0061] like Figure 1 , Figure 8 , Fig. 9 As shown, in order to better screw the preform 900, the three-time screwing assembly 300 also includes a tightening mechanism, which cooperates with the first end of the core rod 400 to push the core rod 400 to move along its axis while the screwing mechanism 36 drives the core rod 400 to rotate. Further, the tightening mechanism includes a pushing drive mechanism and a pushing member 19; the pushing drive mechanism moves along the axial direction of the core rod 400 to exert a pushing effect; the pushing member 19 is rotatably arranged on the pushing drive mechanism, and the pushing member 19 is used to abut against the first end of the core rod 400 so as to rotate with the core rod 400 when the core rod 400 is pushed. Specifically, a bearing 20 is arranged outside the push member 19, and the bearing 20 provides an installation position for the push member 19 and realizes support for the push member 19. The push member 19 is made of rubber material. When it is matched with the core rod 400, there is a large friction between the push member 19 and the core rod 400, so that the push member 19 can rotate with the core rod 400 when the core rod 400 rotates. During the working process, the core rod 400 is driven by the screwing mechanism 36, so the core rod 400 has a feeding speed relative to the nail body 600. At this time, the tightening mechanism moves along the axial direction of the core rod 400, so the tightening mechanism also has a feeding speed relative to the nail body 600. When the two feeding speeds are consistent, that is, the tightening mechanism pushes the core rod 400 at the same speed. Since there is a threaded connection relationship between the core rod 400 and the nail body 600, the tightening mechanism pushes the core rod 400 to move, which can better meet the feeding movement of the core rod 400, thereby better meeting the requirements of the preform 900.

[0062] In this embodiment, if Figure 8 , Fig. 9As shown, the three-time twisting assembly 300 is also provided with a detection mechanism 21 for detecting the position information of the first end of the core rod 400 in the preform 900 on the three-time carrier 7. The detection mechanism 21 is a linear displacement sensor. Since the carrier 15 is provided with a groove 17 for matching the outer circumferential surface of the nail body 600, and one side of the groove 17 is provided with a groove 18 for matching the cap edge of the nail body 600, when the surface of the cap edge is used as the reference surface 22, the detection mechanism 21 can use the end surface of the first end of the core rod 400 as the detection surface 23, so that during the feeding process of the core rod 400, the relative distance between the reference surface 22 and the detection surface 23 is detected. Therefore, when there is a preset distance between the reference surface 22 and the detection surface 23, it can be known whether the screwing of the preform 900 meets the requirements and whether the screwing size is met by comparing the relative distance and the preset distance. Furthermore, the rotation axis of the push member 19 is penetrated by a through hole, through which the detection mechanism 21 detects the position information of the first end of the core rod 400. The structure is simple, easy to manufacture and assemble, and the detection head of the detection mechanism 21 can be quickly aligned with the end face of the first end of the core rod 400, so as to prepare for the detection. It can be known that the detection mechanism 21 can be a contact detection in the above embodiment, or a non-contact detection. When non-contact detection is adopted, it can be a laser rangefinder, etc., and the ray passes through the through hole and hits the first end of the core rod 400 for detection.

[0063] In this embodiment, the twisting mechanism 13 and the nail body carrier 1 can reciprocate along the first straight line. When they are initially matched, the nail body carrier 1 moves along the first straight line relative to the tube body carrier 2, so that the nail body 600 on the nail body carrier 1 and the tube body 500 on the tube body carrier 2 are abutted against each other, that is, the short end of the nail body 600 is tightly inserted into the end of the tube body 500 equipped with the ring 501, and then the core rod 400 is screwed into the tube body 500 and the nail body 600 to complete the screwing of the semi-finished product 700. On this basis, in this embodiment, a detection mechanism 124 is also included. The detection mechanism 124 is set between the loading position and the screwing position matched with the nail body carrier 1, and is used to detect whether the ring 501 is installed in the tube body 500. The detection mechanism 124 is a visual sensor, which detects the presence or absence of the ring 501, thereby avoiding the situation where the components are incomplete during the assembly of the blind rivet. At the secondary twisting assembly 200, the twisting mechanism 2 4 can move along the axis of the semi-finished product 1 700 to insert the broken neck groove of the core rod 400 into the tube body 500, and the second end of the core rod 400 passes through the nail body 600. Therefore, one side of the twisting mechanism 1 3 and the twisting mechanism 2 4 is also provided with a fixing seat connected to the tension spring, and the twisting mechanism 1 3 and the twisting mechanism 2 4 realize reciprocating motion through a linear guide rail. The cylinder of the twisting mechanism 1 3 / twisting mechanism 2 4 cooperates with the tension spring, and the tension spring is used to perform floating twisting when working, and the tension spring is used to pull the twisting mechanism 1 3 / twisting mechanism 2 4 back to the initial position when not working. When the preform 900 is twisted and installed at the tertiary twisting assembly 300, the tightening mechanism moves along the axis of the semi-finished product 2 800, so that when the twisting mechanism 3 6 clamps the second end, the tightening mechanism is used to push the first end, and finally the preform 900 is formed.

[0064] In this embodiment, a method for screwing a blind rivet is also disclosed, using the blind rivet screwing device as described above, including the following steps:

[0065] S100, arranging the axes of the core rod 400, the tube body 500 and the nail body 600 along a first straight line in section 1;

[0066] S200, by clamping the first end of the core rod 400 to rotate the core rod 400, and making the core rod 400, the tube body 500, and the nail body 600 relatively move in coordination on the first straight line, so as to screw the core rod 400, the tube body 500, and the nail body 600 into a semi-finished product 700, in which the second end of the core rod 400 penetrates the tube body 500 and extends into the nail body 600, and one end of the assembly ring 501 of the tube body 500 is tightly pressed against the shrinking end of the nail body 600;

[0067] S300, positioning and placing the semi-finished product 1 700 in the second stage, screwing the core rod 400 to screw the semi-finished product 1 700 into the semi-finished product 2 800, in which the broken neck groove of the core rod 400 is inserted into the tube body 500 and the broken neck groove does not enter the nail body 600, and the second end of the core rod 400 passes through the nail body 600;

[0068] S400, positioning and placing the semi-finished product 2 800 in the third stage, screwing the core rod 400 to screw the semi-finished product 2 800 into a preform 900, in which the broken neck groove of the core rod 400 is inserted into the nail body 600, and the first end of the core rod 400 is against the end of the tube body 500.

[0069] Specifically, in the present embodiment, the nail body 600 is transferred to the nail body carrier 1 by means of a clamping mechanism 8, the tube body 500 is transferred to the tube body carrier 2 by means of a clamping mechanism 2, and the core rod 400 is transferred to the twisting mechanism 3 by means of a clamping mechanism 3. The nail body 600, the core rod 400, and the tube body 500 are arranged along a first straight line in the first section through the nail body carrier 1, the tube body carrier 2, and the twisting mechanism 3. The axis of the nail body 600, the axis of the tube body 500, and the axis of the core rod 400 all coincide with the first straight line. The nail body 600 is positioned by means of a pressing mechanism on the nail body carrier 1. The twisting mechanism 3 clamps the first end of the core rod 400. Thus, in the process of rotating the core rod 400, the twisting mechanism 3 and the tube body carrier 2 are moved along the first straight line, so that the core rod 400, the tube body 500, and the nail body 600 are twisted and assembled into a semi-finished product 700. Next, the semi-finished product 700 is clamped by the clamping mechanism 49 and transferred to the secondary carrier 5. The semi-finished product 700 is positioned by the pressing mechanism on the secondary carrier 5, and then the first end of the core rod 400 is clamped by the screwing mechanism 2, so that the core rod 400 is screwed and the broken neck groove of the core rod 400 is fed to the preset position, thereby screwing the core rod 400, the tube body 500, and the nail body 600 into a semi-finished product 800. Finally, the clamping mechanism 5 10 is used to clamp the semi-finished product 800, and the semi-finished product 800 is transferred to the tertiary carrier 7. The semi-finished product 800 is positioned by the pressing mechanism on the tertiary carrier 7, and then the second end of the core rod 400 is clamped by the screwing mechanism 3, and the tightening mechanism presses the first end of the core rod 400, so that the core rod 400 is fed to the position that meets the requirements of the preform 900 through the screwing and pushing of the tightening mechanism, so that the core rod 400 is screwed and assembled into a preform 900.

[0070] In the process of screwing the core rod 400, the tube body 500, and the nail body 600 into the semi-finished product 700 in step S200, the core rod 400 is screwed forward and backward in the first stage to screw the core rod 400, the tube body 500, and the nail body 600 into the semi-finished product 700. That is, when the tube body 500 and the nail body 600 are abutted and matched, and the constricted end of the nail body 600 is inserted into the tube body 500, the core rod 400 is inserted into the tube body 500 and is ready to be screwed, and first rotates in the opposite direction along the thread of the nail body 600, so that the thread of the core rod 400 finds the thread head of the nail body 600, thereby further avoiding the screwing jam, thereby further improving the screwing speed of the screwing, and better ensuring the screwing quality.

[0071] In the process of screwing the semi-finished product 2 800 into the preform 900 in step S300, in the third stage, the second end of the core rod 400 is clamped to rotate the core rod 400, and the core rod 400 is pushed at the first end of the core rod 400 to screw the preform 900. In general, the core rod 400 can be directly screwed by the screwing mechanism 3 6 to form the preform 900, but in this process, since only the screwing mechanism 3 6 moves along the axis of the semi-finished product 2 800, and the screwing mechanism 3 6 clamps the second end of the core rod 400, the feeding of the core rod 400 to the nail body 600 is achieved by pulling and screwing, and the feeding movement efficiency is not high at this time, so the tightening mechanism is used to assist the pushing to improve the screwing efficiency. On this basis, when the preform 900 is made, it is necessary to detect in real time whether the screwing dimensions meet the requirements. Therefore, when the accompanying movement of the tightening mechanism can satisfy the position determination of the first end of the core rod 400 when the reference plane 22 is constant, that is, in this embodiment, when the surface of the brim is used as the reference plane 22, the detection mechanism 21 can use the end face of the first end of the core rod 400 as the detection surface 23, so that after the core rod 400 is screwed, the relative distance between the reference plane 22 and the detection surface 23 is detected. Therefore, when there is a preset distance between the reference plane 22 and the detection surface 23, by comparing the relative distance and the preset distance, it can be known whether the screwing of the preform 900 meets the requirements and whether the screwing dimensions are met.

[0072] It should be noted that in the present embodiment, horizontal screwing is adopted in all three screwing steps. Compared with the vertical screwing in the prior art, it can reduce the influence of the shaking of the mechanism on the screwing, and at the same time avoid the influence of gravity on the screwing process, resulting in jamming.

[0073] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A blind rivet screwing device, characterized in that: It includes a primary twisting assembly, a secondary twisting assembly and a tertiary twisting assembly; The one-time twisting assembly comprises a nail body carrier, a tube body carrier and a twisting mechanism 1, wherein the nail body carrier, the tube body carrier and the twisting mechanism 1 are arranged in sequence along a first straight line, the twisting mechanism 1 is used to clamp the first end of the core rod to drive the core rod to rotate around its axis, the twisting mechanism 1, the nail body carrier and the tube body carrier cooperate along the first straight line to combine the core rod, the tube body on the tube body carrier and the nail body on the nail body carrier into a semi-finished product 1, in which the second end of the core rod penetrates the tube body and extends into the nail body, and one end of the tube body assembly ring is tightly pressed against the shrinking end of the nail body; The secondary twisting assembly comprises a second twisting mechanism and a secondary carrier, the secondary carrier is used to position and place the semi-finished product one, the second twisting mechanism is used to cooperate with the first end of the core rod to drive the core rod to rotate around its axis, the second twisting mechanism and the secondary carrier cooperate along the axis of the semi-finished product one to twist the semi-finished product one into a semi-finished product two, in which the broken neck groove of the core rod is inserted into the tube body and the broken neck groove does not enter the nail body, and the second end of the core rod passes through the nail body; The three-time twisting assembly includes a twisting mechanism three and a three-time carrier, the three-time carrier is used to position and place the semi-finished product two, the twisting mechanism three is used to clamp the second end of the core rod to drive the core rod to rotate around its axis, the twisting mechanism three and the three-time carrier cooperate along the axis of the semi-finished product two to twist the semi-finished product two into a preform, in which the broken neck groove of the core rod is inserted into the nail body, and the first end of the core rod is butted against the end of the tube body; The three-twist assembly also includes: The tightening mechanism cooperates with the first end of the core rod to push the core rod to move along its axis while the twisting mechanism drives the core rod to rotate.

2. A blind rivet screwing device as claimed in claim 1, characterized in that: The nail body carrier, secondary carrier, and tertiary carrier all include a press-fitting mechanism for positioning and matching the nail body; The press-fitting mechanism comprises: A carrier, used for placing the nail body; The clamping grip can be switched between the clamping position and the loosening position to clamp the nail body onto the carrier.

3. A blind rivet screwing device as claimed in claim 2, characterized in that: The carrier is provided with a groove portion 1 for matching with the outer circumferential surface of the nail body, and a groove portion 2 for matching with the nail body cap edge is provided on one side of the groove portion 1.

4. A blind rivet screwing device as claimed in claim 1, characterized in that: The first twisting mechanism, the second twisting mechanism and the third twisting mechanism are provided with torque sensors for detecting whether the twisting action is stuck.

5. A blind rivet screwing device as claimed in claim 1, characterized in that: The tube body carrier switches between a loading position and a screwing position that cooperates with the nail body carrier; Also includes: Detection mechanism one, the detection mechanism one is arranged between the loading position and the screwing position, and is used to detect whether a ring is installed in the pipe body.

6. A blind rivet screwing device as claimed in claim 1, characterized in that: The tightening mechanism comprises: A push driving mechanism, the push driving mechanism moves axially along the core rod to exert a push action; A pushing member is rotatably arranged on the pushing driving mechanism, and the pushing member is used to abut against the first end of the core rod so as to rotate with the core rod when pushing the core rod.

7. A blind rivet screwing device as claimed in claim 6, characterized in that: The tertiary twisting assembly is also provided with a second detection mechanism for detecting the position information of the first end of the core rod in the preform on the tertiary carrier.

8. A blind rivet screwing device as claimed in claim 7, characterized in that: A through hole is provided through the rotation axis of the push member, and the second detection mechanism detects the position information of the first end of the core rod through the through hole.

9. A method for screwing a blind rivet, characterized in that: The screwing device for a blind rivet according to any one of claims 1 to 8 comprises the following steps: The axes of the core rod, the tube body and the nail body are arranged along a first straight line in section one; The first end of the core rod is clamped to rotate the core rod, and the core rod, the tube body, and the nail body are relatively matched and moved on the first straight line, so that the core rod, the tube body, and the nail body are screwed together into a semi-finished product 1, in which the second end of the core rod penetrates the tube body and extends into the nail body, and one end of the tube body assembly ring is tightly pressed against the shrinking end of the nail body; In the second working section, the semi-finished product 1 is positioned and placed, and the core rod is screwed to screw the semi-finished product 1 into the semi-finished product 2, in which the broken neck groove of the core rod is inserted into the tube body and the broken neck groove does not enter the nail body, and the second end of the core rod passes through the nail body; In the third stage, the semi-finished product 2 is positioned and placed, and the core rod is screwed to screw the semi-finished product 2 into a preform. In the preform, the broken neck groove of the core rod is inserted into the nail body, and the first end of the core rod is against the end of the tube body.

10. A method for screwing a blind rivet according to claim 9, characterized in that: In the first working section, the core rod is screwed forward and backward to screw the core rod, the tube body and the nail body into a semi-finished product one.

11. A method for screwing a blind rivet according to claim 9, characterized in that: In the third stage, the second end of the core rod is clamped to rotate the core rod, and the core rod is pushed at the first end of the core rod to be screwed into a preform.

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