Portable assembling device for long hollow rivet and flat round head screw for aircraft floor

Abstract

The utility model provides a portable assembling device for a long hollow rivet and an oblate head screw for an aircraft floor. The portable assembling device comprises a drill chuck, a rotating motor, a stamping motor, a transmission assembly, a spring limiting assembly, a spinning device and a stamping clamp. The spring limiting assembly is installed on the transmission assembly. During spinning, the spinning device body is installed in an inner hole of a rivet, the clamping end of the spinning device is located above the straight opening end of the rivet, the supporting end of the spinning device is located below a horn mouth of the rivet, an arc-shaped groove with a downward opening is formed in the clamping end, and under rotation driving of the rotating motor, the straight opening end of the rivet is pressed into an arc-shaped protrusion, and the horn mouth end of the rivet is flattened. During stamping, the oblate head screw is installed in the rivet, the head of the oblate head screw is vertically upward, the stamping clamp is clamped on a screw rod body, and the head of the screw is located in the stamping clamp cavity. The bottom of the stamping clamp is stamped by the stamping motor, the arc-shaped protrusions are evenly flattened, fastening of the flat round head screw and the aircraft floor is achieved, operation is easy, and the floor and the head of the screw cannot be damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation assembly manufacturing and repair, and particularly relates to a portable assembly device for long hollow rivets and oval head screws used for an aircraft floor. Background Technique

[0002] During the outfield maintenance and support process of aviation equipment, especially aircraft, it is usually necessary to replace long hollow rivets and oval head screws on the composite material floor on the aircraft. When replacing long hollow rivets and oval head screws on the composite material floor, it is necessary to ensure that neither the oval head screws nor the composite material floor is damaged. At the same time, by using a punch to stamp the long hollow rivet, the two ends are flanged flat and the holes are uniformly shrunk, so as to fix the oval head screw and protect the floor mounting hole.

[0003] At present, the general assembly method for long hollow rivets and oval head screws is as follows: put the screw rod part of the oval head screw into the long hollow rivet, position it with a flat-blade screwdriver, and cooperate with a flat punch, a gasket and a hammer to stamp the end of the long hollow rivet to complete the flanging. Due to the low matching degree between the tool and the use requirement, it is difficult to master the angle when stamping the hollow rivet, and it is very easy to cause impact damage or scratches to the composite material floor or the oval head screw due to improper operation. At the same time, due to the poor matching degree between the flat punch and the long hollow rivet, the end contact is incomplete, resulting in uneven force during the stamping process, irregular shrinkage of the long hollow rivet holes, and uneven flanging, so that the long hollow rivet loses the protection and fixing effect on the oval head screw, easily causing problems such as loose floor fixing and local warping, affecting the safety of the crew on the aircraft and accelerating the failure of the remaining hollow rivets. The above assembly method completely depends on the operator's technique and experience, and is greatly affected by human factors. There are problems such as low assembly efficiency, poor assembly effect, and inability to guarantee identity. Moreover, the tools used are numerous, of various types, and inconvenient to carry, and it is very easy to generate foreign objects on the aircraft due to human errors, affecting the flight safety of the aircraft.

[0004] To solve the above problems, it is urgent to design a portable assembly device for long hollow rivets and oval head screws suitable for outfield maintenance and support, so as to achieve precise assembly, improve assembly efficiency, and ensure assembly quality, which plays an important role in ensuring the safety of the crew and the flight safety of the aircraft.

[0005] Chinese Patent with the publication number of CN204934473U discloses a hollow rivet assembly mechanism, which clamps and fixes the hollow rivet through a laser sensor, a rivet carrier plate and a clamping guide rod, and can solve the uncertain factors of vacuum adsorption feeding caused by the hollow of the rivet during the assembly process of a large number of hollow rivets. However, this mechanism is large in volume, requires a fixed power supply, and has low flexibility. Therefore, it is not suitable for operation in narrow spaces such as the cabin, and no corresponding protection measures are made for other structures around the hollow rivet, and it is easy to damage the surrounding structures during the assembly process, and cannot meet the protection requirements for the composite material floor and the oval head screw.

[0006] Through market research, the assembly of long hollow rivets and flat head screws mainly relies on the cooperation of multiple tools for installation, which requires high skills of operators, has a long assembly time, and poor identity after assembly. To achieve fast, convenient and accurate installation, most existing relevant manufacturing and repair units use large assembly machine tools for installation, which requires a large amount of transformation of infrastructure, has a long transformation cycle and high costs, and this type of large machine tool generally shows a high damage rate of the screw heads of flat head screws during the assembly process. Therefore, for the installation of aircraft composite floors, a low-cost, portable, and long hollow rivet and flat head screw rapid and precise assembly device suitable for operation in narrow spaces is needed. Summary of the Utility Model

[0007] The purpose of the present utility model is to solve the problems of complicated processes, difficult angle control, non-standard shrinkage holes of long hollow rivets, large influence of human factors, low assembly efficiency, and poor assembly effect in the assembly of long hollow rivets and flat head screws on existing aircraft composite floors, and to provide a portable assembly device for long hollow rivets and flat head screws for aircraft floors. This device can meet the requirements of spinning and stamping, and can achieve stable flanging and uniform shrinkage of hollow rivets while protecting the composite floor and flat head screws from damage, improving the assembly efficiency and quality, ensuring the identity of the assembly, and reducing human errors. When assembling long hollow rivets and flat head screws of different models and specifications, only the corresponding size spinning device and stamping fixture need to be replaced, which has high universality.

[0008] To achieve the above purpose, the technical solution provided by the present utility model is as follows:

[0009] A portable assembly device for long hollow rivets and flat head screws for aircraft floors. The long hollow rivet includes a straight mouth end and a flared mouth end. The straight mouth end of the long hollow rivet is located above the aircraft floor, and the flared mouth end is located below the aircraft floor. The aircraft floor is a composite floor. The special feature is that this assembly device includes a handheld driving device, a spinning device, a spring limiting component, and a stamping fixture;

[0010] The handheld driving device includes a drill chuck, a rotary motor, a stamping motor, a transmission component, and a spring limiting component;

[0011] The rotary motor, the stamping motor, the spring limiting component, and the transmission component are located in the inner cavity of the drill chuck body. The rotary motor can drive the transmission component to rotate, thereby driving the clamping end of the spinning device to rotate; the stamping motor is used to drive the transmission component to move linearly along its axial direction; the jaws of the drill chuck are used to clamp the clamping end of the spinning device during spinning operation or the clamping end of the stamping fixture during stamping operation;

[0012] The spring limiting component is sleeved on the transmission component and connected to the inner wall of the drill chuck body; the transmission component can reciprocate under the drive of the stamping motor and the rebounding action of the spring limiting component, driving the drill chuck and the stamping fixture to move together.

[0013] During the spinning operation, the spinning device body is installed in the inner hole of the long hollow rivet, and the clamping end of the spinning device is located above the straight end of the long hollow rivet, and the supporting end of the spinning device is located below the flared end of the long hollow rivet; an arc-shaped groove with an opening downward is provided in the clamping end of the spinning device; the spinning device can rotate under the synchronous rotation drive of the rotating motor, the transmission component and the drill chuck, pressing the straight end of the long hollow rivet to form an arc-shaped protrusion, and flattening the flared end of the long hollow rivet.

[0014] During the stamping operation, the oval head screw is installed in the long hollow rivet, and the head of the oval head screw is vertically upward; the stamping fixture clamps on the rod body of the oval head screw with a clearance fit; the head of the oval head screw is located in the cavity of the stamping fixture; the bottom of the stamping fixture can flatten the arc-shaped protrusion formed during spinning on the long hollow rivet and uniformly reduce the hole under the synchronous stamping action of the stamping motor, the transmission component and the drill chuck, realizing the fastening of the oval head screw to the aircraft floor.

[0015] Further, the transmission component includes a driving gear, a driven gear and a transmission rod. The output shaft of the rotating motor is coaxially connected to the driving gear for driving the driving gear to rotate.

[0016] The driving gear meshes with the driven gear for transmission.

[0017] The stamping motor is coaxially arranged with the driven gear, the transmission rod and the jaws of the drill chuck in sequence.

[0018] One end of the transmission rod is fixedly connected to the end of the driven gear, and the other end passes through the central hole of the driven gear and the spring limiting component and extends into the drill chuck, and is fixedly connected to the inside of the drill chuck.

[0019] The end of the output shaft of the stamping motor can contact the end of one end of the transmission rod to apply a stamping driving force.

[0020] Further, the spring limiting component includes a spring and a limiting rod.

[0021] The limiting rod is radially fixed on the inner wall of the drill chuck body, and a central through hole is provided in the middle of the limiting rod, and the rod body of the transmission rod passes through the central through hole.

[0022] The spring is sleeved on the rod body of the transmission rod and is located between the driven gear and the limiting rod.

[0023] Further, the transmission rod is in the shape of a second-order shaft, and the large end of the transmission rod is located at the driven gear and is close to the output shaft side of the stamping motor;

[0024] The small end of the transmission rod sequentially passes through the central hole of the driven gear, the spring and the central hole of the limiting rod, and extends into the drill chuck to be fixed to the drill chuck.

[0025] Further, symmetrically arranged on the inner wall of the drill chuck body are clamping grooves with openings facing inwards, and both ends of the limiting rod are fixedly connected to the clamping grooves in a clamping manner.

[0026] Further, the spinning device includes a spinning bolt and a spinning nut connected coaxially;

[0027] The arc-shaped groove is arranged in the bolt head of the spinning bolt, and the opening faces the rod body of the spinning bolt;

[0028] The axial dimension of the rod body of the spinning bolt is greater than the axial dimension of the long hollow rivet;

[0029] The bolt head of the spinning bolt is the clamping end of the spinning device, and the spinning nut is the supporting end of the spinning device;

[0030] During the spinning operation, the long hollow rivet is installed in the installation hole on the aircraft floor, and the rod body of the spinning bolt is matched with the inner hole of the long hollow rivet; the bolt head of the spinning bolt is located above the straight end of the long hollow rivet, and the spinning nut is located below the flared end of the long hollow rivet.

[0031] Further, the bolt head of the spinning bolt is an external hexagonal head.

[0032] Further, the stamping fixture includes a clamping end and a fixture body, which are formed by the cooperation of two symmetric hollow punches;

[0033] A single hollow punch includes a punch clamping end and a punch body connected coaxially. The punch clamping end is arranged at the top of the punch body. A cavity is arranged inside the punch body, and a semi-circular through hole is arranged at the center of the bottom of the punch body; the radius of the semi-circular through hole is greater than the radius of the rod body of the oval head screw;

[0034] After the two hollow punches are combined, a cavity for accommodating the head of the oval head screw is formed at the top of the punch body; the rod body of the oval head screw passes through the circular through hole formed at the bottom of the punch body.

[0035] Further, the clamping end of the stamping fixture is a hexagonal prism, and the fixture body is a cylinder.

[0036] Further, it further includes a changeover switch, and the changeover switch is used to switch the on-off control of the rotary motor and the stamping motor.

[0037] The advantages of the present utility model are as follows:

[0038] Compared with the existing assembly method of long hollow rivets and oval head screws on composite material floors, the present utility model has the following advantages:

[0039] 1. The present utility model designs a handheld driving device, a spinning device and a stamping fixture. By switching between a rotary motor and a stamping motor, screwing and stamping operations during the assembly of long hollow rivets and oval head screws are realized. The structure is delicate and simple, light and portable, and will not damage the aircraft floor and long hollow rivets during use, especially suitable for operation in narrow spaces such as the cabin. The present utility model is an integrated design, suitable for on-site maintenance and support, and can effectively avoid the generation of foreign objects on the aircraft caused by missing tools.

[0040] 2. The present utility model is provided with a rotary motor and a stamping motor. When the rotary motor works, it drives the transmission rod and the drill chuck to rotate through gear meshing, realizing the screwing and installation of long hollow rivets. When switching to the stamping motor to work, the stamping motor acts on the transmission rod, making the transmission rod and the drill chuck move linearly and reciprocally at the same time, realizing the pressure installation of the oval head screws. The present utility model simultaneously has the spinning and stamping capabilities during the assembly process, simplifies the cumbersome processes of traditional assembly methods, can assemble quickly and accurately, and improves the assembly efficiency.

[0041] 3. The present utility model designs an arc-shaped groove inside the head of the spinning bolt and the bottom of the hollow punch is designed as a plane, so that the force is uniform during both the spinning and stamping processes, and the requirement of uniformly shrinking the holes of the long hollow rivets can be achieved, with good identity and high assembly quality, and can ensure the flatness and stability of the cabin floor fixation.

[0042] 4. The present utility model designs a cavity inside the hollow punch, so that the head of the oval head screw is located inside the cavity, effectively avoiding mechanical damage to the composite material floor and the oval head screw during the assembly process.

[0043] 5. When using the device of the present utility model for assembly, the assembly process only includes two actions of spinning and stamping, with lower requirements for the operator's skills, effectively reducing the probability of human errors, and being more universal while ensuring the assembly quality. Description of the Drawings

[0044] Figure 1 is a schematic structural diagram of the handheld driving device in the long hollow rivet and oval head screw assembly device of the present utility model;

[0045] Figure 2 is a schematic structural diagram of the spinning device in the present utility model;

[0046] Figure 3 is a schematic structural diagram of the stamping fixture in the present utility model;

[0047] Figure 4 It is a schematic diagram of the structure of the hollow punch in the stamping fixture of the present utility model;

[0048] Figure 5 It is an operation schematic diagram of spin forming using the assembly device of the present utility model;

[0049] Figure 6 It is an operation schematic diagram of stamping using the assembly device of the present utility model.

[0050] Explanation of reference numerals: 1 - Handheld driving device, 101 - Rotating motor, 102 - Stamping motor, 103 - Driving gear, 104 - Driven gear, 105 - Spring, 106 - Limiting rod, 107 - Transmission rod, 108 - Drill chuck, 2 - Spin forming device, 201 - Bolt head, 202 - Bolt rod body, 203 - Spin forming nut, 3 - Stamping fixture, 301 - Punch clamping end, 302 - Punch body, 303 - Cavity, 304 - Semi-circular hole, 4 - Long hollow rivet, 5 - Composite material floor, 6 - Floor mounting hole, 7 - Oval head screw. Detailed implementation manners

[0051] The embodiments of the present utility model will be described in detail below. The embodiments are exemplary and are intended to explain the present utility model, but should not be construed as a limitation to the present utility model.

[0052] Refer to Figures 1-4 , the long hollow rivet 4 installed on the aircraft composite material floor 5 includes a straight mouth end and a flared mouth end. When installed, the long hollow rivet is located in the aircraft floor mounting hole 6, and the straight mouth end of the long hollow rivet is located above the aircraft floor, and the flared mouth end is located below the aircraft floor. The aircraft floor is a composite material floor. The oval head screw 7 is located in the inner hole of the long hollow rivet, and the oval head portion of the oval head screw is located above the aircraft floor.

[0053] To fix the oval head screw to the aircraft floor through the long hollow rivet without damaging the oval head screw and the composite material floor, the present embodiment provides a portable assembly device for the long hollow rivet and the oval head screw for the aircraft floor, including a handheld driving device 1, a spin forming device 2, a limiting spring assembly, and a stamping fixture 3. The handheld driving device 1 includes a rotating motor 101, a stamping motor 102, a transmission assembly, a spring limiting assembly, and a drill chuck 108. The rotating motor 101, the stamping motor 102, the spring limiting assembly, and the transmission assembly are located in the inner cavity of the drill chuck body. The jaws of the drill chuck are used to clamp the clamping end of the spin forming device 2 during spin forming operation or clamp the clamping end of the stamping fixture 3 during stamping operation.

[0054] During the spinning operation, the spinning device body is installed in the inner hole of the long hollow rivet 4, and the clamping end of the spinning device 2 is located above the straight end of the long hollow rivet, and the supporting end of the spinning device is located below the flared end of the long hollow rivet; an arc-shaped groove with a downward opening is provided inside the clamping end of the spinning device 2; the spinning device can rotate under the synchronous rotation drive of the rotating motor 101, the transmission component and the drill chuck 108, pressing the straight end of the long hollow rivet to form an arc-shaped protrusion, and flattening the flared end of the long hollow rivet.

[0055] The spring limiting component is installed on the transmission component, and the transmission component can reciprocate under the drive of the stamping motor and the spring-back action of the spring limiting component, driving the drill chuck and the stamping fixture to move together. During the stamping operation, the oval head screw is installed in the long hollow rivet, and the head of the oval head screw is vertically upward; the stamping fixture clamps on the rod body of the oval head screw with a clearance fit. The head of the oval head screw is located inside the cavity of the stamping fixture, and the bottom of the stamping fixture can flatten the arc-shaped protrusion formed during spinning on the long hollow rivet and evenly reduce the hole under the synchronous stamping action of the stamping motor, the transmission component and the drill chuck, realizing the fastening of the oval head screw 7 to the aircraft floor. The control precision is high during the assembly process, avoiding mechanical damage to the aircraft composite material floor and the oval head screw during the assembly process.

[0056] Refer to Figure 1 As shown, the handheld driving device includes a rotating motor 101, a stamping motor 102, a transmission component, a spring limiting component and a drill chuck 108. The rotating motor 101, the stamping motor 102, the transmission component and the spring limiting component are installed in the cavity of the drill chuck 108 body. The transmission component includes a driving gear 103, a driven gear 104 and a transmission rod 107. The output shaft of the rotating motor 101 is coaxially connected to the driving gear 103 for driving the driving gear 103 to rotate; the driving gear 103 is meshed with the driven gear 104 for transmission. The stamping motor 102 is coaxially arranged with the driven gear, the transmission rod and the spring limiting component in sequence. The transmission rod is in the shape of a second-order shaft. The large end of the transmission rod 107 is located at the driven gear and close to the output shaft of the stamping motor. The large end of the transmission rod is fixedly connected to the driven gear; the small end of the transmission rod passes through the central hole of the driven gear 104 and extends into the drill chuck, and is fixedly connected to the inside of the drill chuck. When the rotating motor works, the driving gear 103 drives the driven gear 104 to rotate, and at the same time drives the transmission rod 107 to rotate, thereby driving the drill chuck and the spinning device to rotate to complete the spinning action. When switching from the rotating motor to the stamping motor to work, the driving gear and the driven gear are still in the meshing state at the moment of switching. When the stamping motor works, the output shaft of the stamping motor applies an impact to the large end of the transmission rod 107, driving the driven gear to separate from the driving gear, and driving the drill chuck and the stamping fixture 3 to move synchronously to complete the stamping action.

[0057] The spring limiting component includes a spring 105 and a limiting rod 106. The limiting rod 106 is radially fixed on the inner wall of the drill chuck body. A central through hole is provided in the middle of the limiting rod, and the rod body of the transmission rod passes through the central through hole. The spring 105 is sleeved on the rod body of the transmission rod 107 and is located between the driven gear 104 and the limiting rod 06. While the limiting rod supports the transmission rod, the spring is limited between the driven gear and the limiting rod, providing a resilience force to the transmission rod during the stamping process. Further, symmetrically arranged inward-opening clamping grooves are provided on the inner wall of the drill chuck body, and both ends of the limiting rod are fixedly connected to the clamping grooves in a clamping manner.

[0058] The rotary motor is used for performing a spinning action, and the stamping motor is used for performing a stamping operation. The switching between the rotary motor and the stamping motor is achieved through a changeover switch. The forward and reverse rotation, speed adjustment, and stamping frequency setting can be independently selected according to the usage conditions.

[0059] Refer to Figure 2 , the spinning device 2 is used to cooperate with the long hollow rivet 4. The spinning device 2 includes a spinning bolt and a spinning nut 203 connected coaxially. The spinning bolt includes a bolt head 201 and a bolt rod body 202. The bolt head 201 and the bolt rod body 202 are integrally formed structures. An arc-shaped groove is provided in the bolt head 201, and the opening of the arc-shaped groove faces the bolt rod body 202. The arc-shaped groove is used to evenly turn out the straight end of the long hollow rivet 4 to form an arc-shaped protrusion when cooperating with the spinning nut to tighten. The bolt head 201 is an external hexagonal head, which is convenient for clamping by the jaws of the drill chuck 108.

[0060] The bolt rod body 202 is used to cooperate with the inner hole of the long hollow rivet 4 during the spinning operation, and the axial dimension of the bolt rod body is greater than the axial dimension of the long hollow rivet.

[0061] The bolt head 201 is the clamping end of the spinning device, and the spinning nut 203 is the supporting end of the spinning device. During the spinning operation, the long hollow rivet is installed in the mounting hole on the aircraft floor, and the bolt rod body 202 is cooperatively connected with the inner hole of the long hollow rivet; the bolt head of the spinning bolt is located above the straight end of the long hollow rivet, and the spinning nut is located below the flared end of the long hollow rivet.

[0062] Refer to Figure 3 and Figure 4 , the stamping fixture 3 includes a clamping end and a fixture body, which is composed of two symmetric hollow punches. A single hollow punch includes a punch clamping end 301 and a punch body 302 connected coaxially. The punch clamping end is arranged at the top of the punch body and is hexagonal prism-shaped, which is convenient for clamping by the jaw clamp of the drill chuck 108 during the stamping operation.

[0063] The punch body 302 is semi-cylindrical, with a cavity inside. A semi-circular hole is provided at the center of the bottom of the punch body. The radius of the semi-circular hole 304 is greater than the radius of the rod body of the oval head screw. During the stamping operation, after the two hollow punches are combined, the punch body forms a cavity for accommodating the head of the oval head screw, avoiding damage to the head of the oval head screw during the stamping process. The two semi-circular holes form a through hole, facilitating the smooth passage of the rod portion of the oval head screw 7, and enabling the head of the oval head screw to be located inside the cavity of the stamping fixture.

[0064] The following refers to Figure 5 and Figure 6 to specifically describe the process of using the device of the present utility model for spinning and stamping operations.

[0065] Step 1, referring to Figure 5 , pass the bolt rod body 202 through the inner hole of the long hollow rivet 4, and place the combined long hollow rivet 4 into the floor mounting hole 6 of the composite floor 5. Note that the bolt head 201 should be located at the straight end of the long hollow rivet, and the spinning nut 203 is located at the flared end of the long hollow rivet.

[0066] Step 2, clamp the bolt head 201 with the jaw clamp of the drill chuck 108, and fix the spinning nut 203 with a wrench; start the rotating motor 101, the driving gear 103 rotates, the driving gear drives the driven gear 104 to rotate, so that the bolt rod body 202 and the spinning nut 203 are screwed tightly, and the distance between the bolt head 201 and the spinning nut 203 shrinks. At the same time, the spinning nut 203 flattens the flared end of the long hollow rivet 4 evenly by flanging, and the arc-shaped groove in the bolt head evenly turns out the straight end of the long hollow rivet 4 during the screwing process of the bolt, forming an arc-shaped protrusion.

[0067] Step 3, after the flanging is completed, drive the rotating motor 101 to reverse, unscrew and separate the spinning bolt and the spinning nut 203, and take out the spinning bolt.

[0068] Step 4, referring to Figure 6 , place the oval head screw 7 into the long hollow rivet 4, with the head of the oval head screw above the arc-shaped protrusion of the long hollow rivet. Clamp the two hollow punches symmetrically on the oval head screw 4, so that the rod body of the oval head screw passes through the through hole at the bottom of the hollow punch, and the head of the oval head screw is inside the cavity of the hollow punch.

[0069] Step 5: Clamp the clamping end 302 of the punch with the jaws of the drill chuck 108, start the stamping motor 102, the output shaft of the stamping motor impacts the large end of the transmission rod 107, driving the driven gear 104 to move towards the jaw end of the drill chuck, separating from the driving gear 103. At the same time, the transmission rod 107 drives the drill chuck and the stamping fixture 3 to move synchronously. The bottom of the stamping fixture stamps on the arc-shaped protrusion of the long hollow rivet 4. During the stamping process, the spring 105 realizes the movement reset of the transmission rod, achieving repeated stamping on the arc-shaped protrusion, flattening the back of the arc-shaped protrusion evenly, achieving the purpose of hole shrinking. The long hollow rivet 4 after hole shrinking plays a fixing role for the flat head screw 7 and the composite material floor 5. During the stamping process, the flat head of the flat head screw 7 is located inside the stamping fixture cavity and will not be mechanically damaged.

[0070] Step 6: After stamping, loosen the jaws of the drill chuck 108, separate and remove the two symmetrical hollow punches to complete the assembly work.

[0071] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or replacements, and these modifications or replacements should all be covered within the protection scope of the present invention.

Claims

1. A portable assembly device for long hollow rivets and flat round head screws for aircraft floors, wherein the long hollow rivets include a straight end and a bell end, the straight end of the long hollow rivet is located above the aircraft floor, and the bell end is located below the aircraft floor, and the aircraft floor is a composite material floor; characterized in that: The assembly device includes a handheld driving device, a spinning device, a spring limit assembly and a stamping fixture; The handheld driving device comprises a drill chuck, a rotating motor, a punching motor, a transmission assembly and a spring limit assembly; The rotary motor, the punching motor, the spring limit assembly and the transmission assembly are located in the inner cavity of the drill chuck body. The rotary motor can drive the transmission assembly to rotate, thereby driving the clamping end of the spinning device to rotate; the punching motor is used to drive the transmission assembly to perform linear motion along its axial direction; the clamping jaws of the drill chuck are used to clamp the clamping end of the spinning device during the spinning operation or the clamping end of the punching fixture during the punching operation; The spring limit assembly is sleeved on the transmission assembly and connected to the inner wall of the drill chuck body; the transmission assembly can reciprocate under the driving of the stamping motor and the rebound action of the spring limit assembly, driving the drill chuck and the stamping fixture to move together; During the spinning operation, the spinning device body is installed in the inner hole of the long hollow rivet, and the clamping end of the spinning device is located above the straight end of the long hollow rivet, and the supporting end of the spinning device is located below the bell-mouth end of the long hollow rivet; an arc-shaped groove opening downward is provided in the clamping end of the spinning device; the spinning device can rotate under the synchronous rotation drive of the rotating motor, the transmission assembly and the drill chuck, and press the straight end of the long hollow rivet to form an arc-shaped protrusion, so that the bell-mouth end of the long hollow rivet is flattened; During the stamping operation, the oval head screw is installed in the long hollow rivet, and the head of the oval head screw is vertically upward; the stamping fixture is clamped on the rod body of the oval head screw with clearance fit; the head of the oval head screw is located in the cavity of the stamping fixture; the bottom of the stamping fixture can flatten the arc-shaped protrusion formed on the long hollow rivet during spinning and shrink the hole evenly under the synchronous stamping action of the stamping motor, the transmission assembly and the drill chuck, so as to achieve the fastening of the oval head screw to the aircraft floor.

2. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to claim 1, characterized in that: The transmission assembly includes a driving gear, a driven gear and a transmission rod, and the output shaft of the rotating motor is coaxially connected with the driving gear to drive the driving gear to rotate; The driving gear and the driven gear are meshed for transmission; The punching motor is coaxially arranged with the driven gear, the transmission rod, and the clamping claw of the drill chuck in sequence; One end of the transmission rod is fixedly connected to the end of the driven gear, and the other end passes through the center hole of the driven gear and the spring limit assembly and extends into the drill chuck, and is fixedly connected to the inside of the drill chuck; The output shaft end of the stamping motor can contact one end of the transmission rod to apply a stamping driving force.

3. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to claim 2, characterized in that: The spring limiting assembly comprises a spring and a limiting rod; The limit rod is radially fixed on the inner wall of the drill chuck body, a central through hole is provided in the middle of the limit rod, and the rod body of the transmission rod passes through the central through hole; The spring is sleeved on the rod body of the transmission rod and is located between the driven gear and the limiting rod.

4. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to claim 3 is characterized in that: The transmission rod is in the shape of a second-order shaft, and the large end of the transmission rod is located on the driven gear and close to the output shaft of the stamping motor; The small end of the transmission rod passes through the center hole of the driven gear, the spring and the center hole of the limit rod in sequence, and extends into the drill chuck to be fixed with the drill chuck.

5. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to claim 4, characterized in that: The inner wall of the drill chuck body is symmetrically provided with inwardly opening clamping grooves, and the two ends of the limit rod are respectively fixedly connected to the clamping grooves by clamping.

6. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to claim 3, characterized in that: The spinning device comprises a coaxially connected spinning bolt and a spinning nut; The arc-shaped groove is arranged in the bolt head of the spinning bolt, and the opening faces the rod body of the spinning bolt; The axial dimension of the rod body of the spinning bolt is greater than the axial dimension of the long hollow rivet; The bolt head of the spinning bolt is the clamping end of the spinning device, and the spinning nut is the supporting end of the spinning device; During the spinning operation, the long hollow rivet is installed in the mounting hole on the aircraft floor, and the rod of the spinning bolt cooperates with the inner hole of the long hollow rivet; the bolt head of the spinning bolt is located above the straight end of the long hollow rivet, and the spinning nut is located below the flared end of the long hollow rivet.

7. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to claim 6, characterized in that: The bolt head of the spun bolt is an external hexagonal head.

8. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to claim 1, characterized in that: The punching fixture includes a clamping end and a fixture body, which is formed by two symmetrical hollow punches; A single hollow punch comprises a punch clamping end and a punch body which are coaxially connected, wherein the punch clamping end is arranged at the top of the punch body, a cavity is arranged inside the punch body, and a semicircular through hole is arranged at the center of the bottom of the punch body; the radius of the semicircular through hole is greater than the radius of the rod body of the flat round head screw; After the two hollow punches are matched, a cavity for accommodating the head of the oval head screw is formed on the top of the punch body; the rod of the oval head screw passes through the circular through hole formed at the bottom of the punch body.

9. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to claim 8, characterized in that: The clamping end of the punching fixture is a hexagonal prism, and the fixture body is a cylinder.

10. The portable assembly device for long hollow rivets and flat round head screws for aircraft floors according to any one of claims 1 to 9, characterized in that: It also includes a conversion switch, which is used to switch the on and off of the rotating motor and the stamping motor.

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