Automatic screwing and riveting-turning fastening method for inner cavity assembly

Abstract

The invention discloses an automatic screwing and rivet turning fastening method for an inner cavity assembly, and relates to the technical field of automatic assembly of parts, and the automatic screwing and rivet turning fastening method comprises a motion platform, a clamp, a rivet guide mechanism, a rivet pushing mechanism, a rivet feeding mechanism, a nut feeding mechanism, a rivet push rod, a rivet turning punch and an electric screw driver. According to the automatic screwing and riveting-turning fastening method for the inner cavity assembly, automatic screwing and riveting-turning fastening of the inner cavity assembly are achieved by combining automatic screwing of the inner cavity assembly and riveting-turning fastening of the assembled semi-hollow external-thread rivet, automatic assembling of side holes of a plurality of workpieces can be achieved automatically, and the assembling efficiency is improved. And the assembly precision and efficiency are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of automatic assembly of parts, and in particular to an automatic screw connection and riveting fastening method for an inner cavity component. Background Art

[0002] Riveting is a non-detachable connection. Due to its unique characteristics, it can be used to connect dissimilar materials and the connection is reliable and not loose. Riveting can generally be divided into: press riveting, spin riveting, pull riveting and flip riveting. Among them, flip riveting is widely used in aerospace, high-speed rail, machinery and other industries due to its advantages such as high connection strength, good corrosion resistance and simple structure. Compared with other riveting methods, flip riveting does not require welding, avoiding many defects in the heat treatment process, and has low requirements for assembly equipment. Therefore, flip riveting is often used as a riveting method in mass production and automated production lines.

[0003] During the riveting process of the inner cavity component, the semi-hollow external thread rivet needs to be passed through the through hole of the workpiece and through the side hole of the component in the inner cavity of the through hole. The assembly gap is less than 0.1mm. The inner cavity component is stacked in multiple layers, and the components need to be in a certain posture to complete the assembly. Even manual work is extremely difficult. In addition, the operator is required to hold the semi-hollow external thread rivet to prevent the rivet from falling, and then use tools to assemble the upper nut. This operation is more laborious. During the tightening process of the nut, the force area of ​​the tightening is small, so it is easy to slip out and scratch the workpiece, and the installation is low. After the nut is assembled, the semi-hollow front part of the rivet is deformed by extrusion after insertion to achieve riveting. However, this traditional riveting method is prone to the phenomenon that the position of the riveting punch is not concentric with the process hole and cannot be accurately aligned. Therefore, the actual riveting process can be said to be blind riveting, which requires skilled workers to judge whether the riveting is completed during the riveting process. However, even if it is operated by skilled workers, the probability of riveting failure due to inaccurate position of the riveting punch and the process hole is still very high, and rework is often required, resulting in poor operability and consistency. Summary of the invention

[0004] The purpose of the present invention is to provide an automated screw connection and riveting fastening method for an inner cavity component, so as to solve the problem of low alignment efficiency in a traditional riveting method.

[0005] To achieve the above object, the present invention provides an automated screw connection and riveting fastening method for an inner cavity component, comprising the following steps:

[0006] S1. Install the inner cavity assembly into the side hole of the workpiece to complete the installation of the inner cavity assembly of all the side holes on the workpiece;

[0007] S2, placing the workpiece to be assembled on the fixture, pre-positioning it using the pre-positioning tool on the fixture, sending the workpiece to the assembly station through the motion platform, and aligning the assembly through hole and the riveting punch on a vertical line;

[0008] S3, extending the riveting punch through the inner cavity component at the bottom of the assembly through hole, and aligning the spatial position of the inner cavity component through the cone at the front end of the riveting punch, and continuing to extend it until it penetrates the inner cavity component and reaches the other end of the side hole, determining the position of the assembly through hole, completing the final positioning of the assembly through hole, and the clamping mechanism fixes the position of the assembly through hole;

[0009] S4, the rivet feeding mechanism sends the rivet to the front end of the rivet pushing mechanism, and the rivet pushing mechanism sends the rivet to the guide hole at the front end of the rivet guide mechanism, completing the pre-positioning of the rivet;

[0010] S5, the rivet guide mechanism is lifted up, and the tip of the riveting punch is inserted into the semi-hollow circular hole on the upper part of the rivet, and the rivet and the riveting punch are made concentric by the cooperation of the cone and the hole, thus completing the final positioning of the rivet;

[0011] S6, the rivet push rod and the riveting punch are lifted synchronously and at the same speed, so that the rivet passes through the inner cavity component and penetrates the assembly through hole. After reaching the rivet assembly position, the rivet push rod is held still, and the rivet assembly is completed;

[0012] S7, the riveting punch is lifted, and the nut feeding mechanism pushes the nut into the assembly through hole to complete the feeding;

[0013] S8, the electric screwdriver moves to the assembly position, completes the tightening and assembly work of the nut, and presses the riveting punch downward to perform riveting operations on the rivets;

[0014] S9, after the riveting is completed, the riveting punch is retracted, the clamping mechanism, the rivet guide mechanism and the rivet push rod are retracted, and the workpiece is sent to the next side hole station to be riveted through the motion platform;

[0015] S10, repeat steps S1-S9 until all assembly through-hole screw connections and riveting are completed, the clamping mechanism is released, and the workpiece is sent to the unloading position through the motion platform to complete unloading.

[0016] Preferably, the rivet pushing mechanism is arranged on the upper part of the rivet guide mechanism, a guide circular hole is arranged on the rivet guide mechanism, a guide through hole is arranged below the guide circular hole, and the guide through hole and the guide circular hole penetrate the rivet guide mechanism.

[0017] Preferably, a rivet push rod is provided at the lower part of the rivet guide mechanism, a buffer medium is provided at the upper part of the rivet push rod, and the rivet push rod is coaxially arranged with the guide through hole and the guide circular hole.

[0018] Preferably, a nail feeding mechanism is provided on the upper portion of the nail pushing mechanism, and a detection mechanism is provided at the front end of the nail feeding mechanism.

[0019] Preferably, a nut feeding mechanism is provided at the end of the nail feeding mechanism, the nut feeding mechanism is arranged parallel to the nail feeding mechanism, and the nut feeding mechanism is moved left and right by a cylinder.

[0020] Preferably, the riveting punch is arranged above the nut feeding mechanism, and the riveting punch is coaxially arranged with the rivet push rod and the guide circular hole.

[0021] Preferably, the riveting punch comprises a tip and a cylindrical end, the diameter of the cylindrical end is larger than the diameter of the semi-hollow part of the rivet and smaller than the diameter of the assembly through hole, and the length of the conical end is smaller than the semi-hollow length of the rivet.

[0022] Therefore, the present invention adopts the above-mentioned automated screw connection and riveting fastening method for the inner cavity component, which has the following beneficial effects:

[0023] (1) In order to solve the problem of automated screw connection and riveting of inner cavity components, the present invention proposes the principle of self-positioning reference, which takes the features of the assembled object itself as the precise assembly positioning reference when the workpiece is assembled. This principle is used to transform the random spatial posture problem of the inner cavity component and the uncertain spatial posture problem of the side hole in the inner cavity workpiece into the coordination problem between the alignment mechanism and the side hole and the inner cavity component, thereby realizing the automated assembly of rivets and automating the screw connection of the inner cavity components, thereby greatly improving the production efficiency.

[0024] (2) The present invention aims to solve the problem that the position of the riveting punch cannot be completely concentric with the process hole and cannot be accurately aligned during the manual riveting process of the semi-hollow external threaded rivet after assembly. The alignment component in the screw connection process is used as the riveting punch in the flanging process to ensure the accurate alignment of the riveting punch and the process hole, thereby solving the problem of possible riveting failure caused by inaccurate position of the riveting punch and the process hole and improving the operability and consistency of the riveting process.

[0025] (3) The present invention combines the automated screw connection of the inner cavity component with the riveting and fastening of the semi-hollow external threaded rivets after assembly, thereby realizing the automated screw connection and riveting and fastening of the inner cavity component, and can automatically realize the automated assembly of multiple side holes of the workpiece, thereby greatly improving the assembly accuracy and efficiency.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the automated screw connection and riveting fastening method of the inner cavity component of the present invention;

[0028] Figure 2 for Figure 1 A in the middle is an enlarged view of the structure;

[0029] Figure 3 It is a schematic diagram of the side structure of the assembly of the present invention;

[0030] Figure 4 This is a schematic diagram of workpiece installation of the present invention;

[0031] Figure 5 This is a schematic diagram of workpiece pre-positioning of the present invention;

[0032] Figure 6 It is a schematic diagram of the final positioning method of the workpiece, the inner cavity component and the rivet of the present invention;

[0033] Figure 7 It is a schematic diagram of the assembly technology route of the present invention;

[0034] Reference numerals

[0035] 1. Clamp; 2. Clamping mechanism; 3. Rivet push rod; 4. Rivet guide mechanism; 5. Riveting punch; 6. Electric screwdriver; 7. Pre-positioning tool; 8. Workpiece to be assembled; 9. Assembly through hole; 10. Guide round hole; 11. Semi-hollow external thread rivet; 12. Inner cavity component; 13. Nut; 14. Nail pushing mechanism; 15. Nail feeding mechanism; 16. Nut feeding mechanism; 17. Side hole. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0037] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] Example

[0039] See also Figure 1-7 The present invention provides an automated screw connection and riveting fastening method for an inner cavity component, comprising the following steps:

[0040] S1, install the inner cavity assembly 12 into the side hole 17 of the workpiece, and complete the installation of the inner cavity assembly 12 of all the side holes 17 on the workpiece. In this process, it is only necessary for the inner cavity assembly 12 to be roughly in the correct posture;

[0041] S2, placing the workpiece 8 to be assembled on the fixture 1, pre-positioning it by the pre-positioning tool 7 on the fixture 1, sending the workpiece to the assembly station by the motion platform, and aligning the assembly through hole 9 and the riveting punch 5 roughly in a vertical line;

[0042] S3, extend the riveting punch 5, pass through the inner cavity component 12 at the lower part of the assembly through hole 9, and use the cone at the front end of the riveting punch 5 to align the spatial position of the inner cavity component 12, and continue to extend it until it penetrates the inner cavity component 12 and reaches the other end of the side hole, determine the position of the assembly through hole 9, complete the final positioning of the assembly through hole 9, and fix the position of the assembly through hole 9 by the clamping mechanism 2;

[0043] S4, the rivet feeding mechanism 15 delivers the rivet to the front end of the rivet pushing mechanism 14, and the rivet pushing mechanism 14 delivers the rivet to the guide hole at the front end of the rivet guide mechanism 4, completing the pre-positioning of the rivet;

[0044] S5, the rivet guide mechanism 4 is lifted up, and the tip of the riveting punch 5 is inserted into the semi-hollow circular hole on the upper part of the rivet, and the rivet and the riveting punch 5 are made concentric by the cooperation of the cone and the hole, thus completing the final positioning of the rivet;

[0045] S6, the rivet push rod 3 and the riveting punch 5 are lifted synchronously and at the same speed, so that the rivet passes through the inner cavity component 12 and penetrates the assembly through hole 9. After reaching the rivet assembly position, the rivet push rod 3 is held still, and the rivet assembly is completed;

[0046] S7, the riveting punch 5 is lifted up, and the nut feeding mechanism 16 pushes the nut 13 into the assembly through hole 9 to complete the feeding;

[0047] S8, the electric screwdriver 6 moves to the assembly position, completes the tightening and assembly work of the nut 13, and the riveting punch 5 is pressed down to perform riveting operation on the rivet;

[0048] S9, after the riveting is completed, the riveting punch 5 is retracted, the clamping mechanism 2, the rivet guide mechanism 4 and the rivet push rod 3 are retracted, and the workpiece is sent to the next side hole station to be riveted through the moving platform;

[0049] S10, repeat steps S1-S9 until all assembly through holes 9 are screwed and riveted, the clamping mechanism 2 is released, and the workpiece is sent to the unloading position through the motion platform to complete unloading.

[0050] The pre-positioning tool 7 on the fixture 1 is used to pre-position the workpiece and its inner cavity component 12. The pre-positioning tool 7 can be in various forms such as two pins on one side, positioning pins, mandrels or cone tips, support pins, etc., depending on the characteristics of the workpiece and the inner cavity component 12. The pre-positioning tool 7 limits the freedom of the workpiece and its inner cavity component 12 itself, so that it can only float within a small range, thereby confirming the approximate position of the hole to be assembled and the inner cavity component 12.

[0051] The riveting punch 5 is mainly used for final positioning of the workpiece, the rivet and the inner cavity component 12 and subsequent riveting work when the workpiece is pre-positioned.

[0052] The final positioning process of the workpiece 8 to be assembled is: insert the riveting punch 5 into the assembly through hole 9 for alignment. At this time, the riveting punch 5 can be regarded as a positioning pin, and the clearance between the riveting punch 5 and the assembly through hole 9 is used to align the precise position of the side hole on the surface of the workpiece in the pre-positioning state, and the assembly through hole 9 is accurately positioned, thereby ensuring the precise positional relationship between the assembly through hole 9 and the riveting punch 5.

[0053] The diameter of the cylindrical part of the riveting punch 5 must be smaller than the minimum diameter of the assembly through hole 9, that is: D0≤d 0min .

[0054] When the inner cavity component 12 is pre-positioned, there is still a certain error between the spatial position of the inner cavity component 12 in the workpiece and the actual installation position. If the rivet is directly inserted, it will not be able to be inserted smoothly due to the error. The final positioning process of the inner cavity component 12 is as follows: after the riveting punch 5 enters the assembly through hole 9, the tip of the riveting punch 5 is used as a guide head to enter the inner cavity component 12, and the error is corrected by using the conical part of the riveting punch 5. In the subsequent process of the riveting punch 5 continuing to go deeper, the mutual force between the cone and the inner cavity component 12 and the workpiece is used to force the inner cavity to return to the correct installation position, until the riveting punch 5 passes through the inner cavity component 12, and the final positioning of the inner cavity component 12 is completed.

[0055] During the final positioning of the inner cavity component, the riveting punch 5 is concentric with the assembly through hole 9, and the alignment range of the riveting punch 5 for the inner cavity component 12 is the radius of the side hole, that is, when the inner cavity component 12 is pre-positioned, the error between it and the actual installation posture cannot be greater than the radius of the assembly through hole 9.

[0056] The rivet is a semi-hollow external threaded rivet 11, and the final positioning of the rivet is: after the riveting punch 5 passes through the inner cavity component 12 and the assembly through hole 9, it is lifted up by the rivet guide mechanism 4 until the tip of the riveting punch 5 is inserted into the semi-hollow circular hole on the upper part of the rivet, completing the final positioning of the rivet.

[0057] The rivet and the riveting punch 5 are concentric by using the cooperation of the cone and the hole, and due to the final positioning process of the workpiece and the inner cavity component 12, the rivet, the inner cavity component 12, the assembly through hole 9 and the riveting punch 5 are all concentric at this time, ensuring the subsequent rivet assembly accuracy and riveting accuracy. In the subsequent riveting process, the riveting punch 5 needs to rivet the rivet, so the diameter of its cylindrical part should be greater than the diameter of the semi-hollow part of the rivet, that is: D0≥D1, and the length of its conical part cannot be greater than the length of the semi-hollow part of the rivet, that is: L1≤L2.

[0058] The cylindrical part of the riveting punch 5 must satisfy the requirement that its diameter is larger than the diameter of the semi-hollow part of the rivet but smaller than the diameter of the side hole, that is, D1≤D0≤d 0min The length of the conical part should be less than the length of the semi-hollow part of the rivet, that is: L1≤L2.

[0059] The rivet guide mechanism 4 is used to pre-position the rivets when the rivets are loaded.

[0060] There is a rivet guide circular hole 10 at the front end of the rivet guide mechanism 4, and the diameter of the circular hole is slightly larger than the diameter of the rivet. The push mechanism 14 pushes the rivet into the circular hole to complete the pre-guiding positioning of the spatial position of the rivet. There is a push rod guide through hole with a diameter slightly smaller than the circular hole at the bottom of the circular hole, which is used for the rivet push rod 3 to pass through. The guide circular hole 10, the through hole, the rivet push rod 3 and the riveting punch 5 are coaxially arranged to ensure that the riveting punch is roughly concentric with the rivet in the pre-positioning state, and to ensure that the riveting punch 5 can align the rivet in subsequent operations. At the same time, the mechanism can move up and down, and is used to initially push the rivet into the side hole, so that the riveting punch 5 can align the rivet. The radius of the riveting punch 5 is the alignment range. Therefore, the coaxiality error between the rivet in the pre-positioning state and the riveting punch 5 shall not be greater than the alignment range, otherwise the rivet cannot be smoothly aligned, that is, the difference between the guide circular hole and the bottom diameter of the rivet shall not be greater than the radius of the riveting punch.

[0061] The rivet push rod 3 is used to push the rivet into the assembly through hole 9 during rivet assembly, and acts as an auxiliary support during the subsequent tightening of the nut 13 and the riveting process of the rivet. The rivet push rod 3 is arranged at the lower part of the rivet guide mechanism 4. The rivet push rod 3 is driven by a cylinder to move the push rod to assist the rivet assembly process.

[0062] After the tip of the riveting punch 5 is inserted into the semi-hollow circular hole on the upper part of the rivet, which is the pre-positioning state of the rivet, the rivet push rod 3 and the riveting punch 5 rise synchronously and at the same speed to ensure that during this process, the tip of the riveting punch 5 is always in the semi-hollow circular hole on the upper half of the rivet, and the rivet can pass through the inner cavity component 12 and the side hole in a manner similar to threading a needle to reach the installation position. There is a thin layer of buffer medium on the upper part of the rivet push rod 3, and the friction coefficient of the buffer medium should be as large as possible, so that during the rivet assembly process, the rivet will not slide from the rivet push rod 3 and affect the rivet assembly. At the same time, the rivet push rod 3 also plays a role in assisting the workpiece support during the riveting process, absorbing the impact stress in the riveting, and reducing the stress deformation that may be caused to the workpiece by the stress. The buffer medium on it is used to protect the outer surface of the workpiece and prevent the rivet push rod from damaging the workpiece surface.

[0063] The nail feeding mechanism 15 is mainly used to deliver the rivets to the front end of the nail pushing mechanism 14. The nail feeding method can be pneumatic nail feeding, mechanical nail feeding or manual nail feeding, etc. The front end of the nail feeding mechanism 15 should be equipped with a detection mechanism, which can cooperate with a photoelectric sensor, a magnetic induction sensor or a weight sensor to complete the nail feeding detection of the rivet.

[0064] The rivet pushing mechanism 14 is installed on the rivet guide mechanism 4, and is used to push the rivets delivered by the rivet feeding mechanism 15 to the front end through hole of the rivet guide mechanism 4. The pushing method can be a cylinder, an electric cylinder, an oil cylinder, etc. There are many ways, as long as its stroke can meet the requirements of pushing the rivets to the front end of the rivet guide mechanism 4. The rivet pushing mechanism 14 and the rivet feeding mechanism 15 jointly complete the rivet feeding work in the press-fitting operation.

[0065] The nut feeding mechanism 16 is used to feed the nut 13 into the through hole after the rivet is assembled, so as to complete the feeding of the nut 13. The feeding method can be pneumatic feeding, mechanical feeding or manual feeding, etc., and the method can be various. The nut feeding mechanism is arranged in parallel with the nail feeding mechanism 15, and both are arranged on the upper part of the rivet guide mechanism 4.

[0066] The fixture 1 is installed on the motion platform, and the workpiece is placed on the fixture 1. The motion platform is used to move to different workstations when different side holes need to be screwed and riveted to complete the subsequent final positioning and screwing and riveting operations. The motion platform can be moved in various ways, such as by a slide rail, a slide table, a motor and a lead screw, or by a slide table, a slide rail and a cylinder.

[0067] Therefore, the present invention adopts the above-mentioned automated screw connection and riveting method for inner cavity components. In order to solve the problem that the position of the riveting punch and the process hole cannot be completely concentric and cannot be accurately aligned during the manual riveting process of the semi-hollow external threaded rivet after assembly, the alignment component in the screw connection process is innovatively used as the riveting punch in the flanging process to ensure the precise alignment of the riveting punch and the process hole, solves the problem of possible riveting failure caused by inaccurate positions of the riveting punch and the process hole, and improves the operability and consistency of the riveting process. The present invention combines the automated screw connection of the inner cavity component with the riveting and fastening of the semi-hollow external threaded rivet after assembly to realize the automated screw connection and riveting fastening of the inner cavity component, and can automatically realize the automated assembly of multiple side holes of workpieces, greatly improving the assembly accuracy and efficiency.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An automated screw connection and riveting method for inner cavity components, characterized in that: The following steps are involved: S1. Install the inner cavity assembly into the side hole of the workpiece to complete the installation of the inner cavity assembly of all the side holes on the workpiece; S2, placing the workpiece to be assembled on the fixture, pre-positioning it using the pre-positioning tool on the fixture, sending the workpiece to the assembly station through the motion platform, and aligning the assembly through hole and the riveting punch on a vertical line; S3, extending the riveting punch through the inner cavity component at the bottom of the assembly through hole, and aligning the spatial position of the inner cavity component through the cone at the front end of the riveting punch, and continuing to extend it until it penetrates the inner cavity component and reaches the other end of the side hole, determining the position of the assembly through hole, completing the final positioning of the assembly through hole, and the clamping mechanism fixes the position of the assembly through hole; S4, the rivet feeding mechanism sends the rivet to the front end of the rivet pushing mechanism, and the rivet pushing mechanism sends the rivet to the guide hole at the front end of the rivet guide mechanism, completing the pre-positioning of the rivet; S5, the rivet guide mechanism is lifted up, and the tip of the riveting punch is inserted into the semi-hollow circular hole on the upper part of the rivet, and the rivet and the riveting punch are made concentric by the cooperation of the cone and the hole, thus completing the final positioning of the rivet; S6, the rivet push rod and the riveting punch are lifted synchronously and at the same speed, so that the rivet passes through the inner cavity component and penetrates the assembly through hole. After reaching the rivet assembly position, the rivet push rod is held still, and the rivet assembly is completed; S7, the riveting punch is lifted, and the nut feeding mechanism pushes the nut into the assembly through hole to complete the feeding; S8, the electric screwdriver moves to the assembly position, completes the tightening and assembly work of the nut, and presses the riveting punch downward to perform riveting operations on the rivets; S9, after the riveting is completed, the riveting punch is retracted, the clamping mechanism, the rivet guide mechanism and the rivet push rod are retracted, and the workpiece is sent to the next side hole station to be riveted through the motion platform; S10, repeat steps S1-S9 until all assembly through-hole screw connections and riveting are completed, the clamping mechanism is released, and the workpiece is sent to the unloading position through the motion platform to complete unloading.

2. The method for automatic screw connection and riveting fastening of inner cavity components according to claim 1, characterized in that: The rivet pushing mechanism is arranged on the upper part of the rivet guiding mechanism. The rivet guiding mechanism is provided with a guiding circular hole. The lower part of the guiding circular hole is provided with a guiding through hole. The guiding through hole and the guiding circular hole penetrate the rivet guiding mechanism.

3. The method for automatic screw connection and riveting fastening of inner cavity components according to claim 2, characterized in that: A rivet push rod is arranged at the lower part of the rivet guide mechanism, a buffer medium is arranged at the upper part of the rivet push rod, and the rivet push rod is coaxially arranged with the guide through hole and the guide circular hole.

4. The method for automatic screw connection and riveting fastening of inner cavity components according to claim 3, characterized in that: The upper part of the nail pushing mechanism is provided with a nail feeding mechanism, and the front end of the nail feeding mechanism is provided with a detection mechanism.

5. The method for automatic screw connection and riveting fastening of inner cavity components according to claim 4, characterized in that: A nut feeding mechanism is arranged at the end of the nail feeding mechanism. The nut feeding mechanism is arranged in parallel with the nail feeding mechanism, and the nut feeding mechanism moves left and right through the cylinder.

6. The method for automatic screw connection and riveting fastening of inner cavity components according to claim 5, characterized in that: The riveting punch is arranged above the nut feeding mechanism, and the riveting punch is coaxially arranged with the rivet push rod and the guide circular hole.

7. The method for automatic screw connection and riveting fastening of inner cavity components according to claim 6, characterized in that: The riveting punch comprises a tip and a cylindrical end, the diameter of the cylindrical end is larger than the diameter of the semi-hollow part of the rivet and smaller than the diameter of the assembly through hole, and the length of the conical end is smaller than the semi-hollow length of the rivet.

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