Flaring self-locking nut mounting tool

Abstract

The invention relates to the technical field of assembly tools for deformed parts, in particular to a flaring self-locking nut mounting tool. The flaring self-locking nut installation tool comprises a main seat body, a nut limiting seat and a flaring punch, a flaring driving mechanism used for driving the flaring punch to move is arranged on the main seat body, the nut limiting seat is provided with a limiting part opposite to the flaring punch in the flaring punch moving direction, and the limiting part is used for being arranged on a thread sleeve section of a flaring self-locking nut in a sleeving mode. A pre-pressing structure is arranged on the main seat body and comprises a pressing part and a pressing driving mechanism used for driving the pressing part to move towards the side where the limiting part is located. The pressing part is used for being pressed on the side face, opposite to the anti-rotation section of the flaring self-locking nut, of the part so as to be matched with the limiting part to clamp the anti-rotation section of the flaring self-locking nut and the part to achieve pre-fixing, and the situation that the nut inclines and the installation quality is affected due to the factor that an operator exerts force on the installation tool when holding the installation tool is not likely to happen.

Description

Technical Field

[0001] The invention relates to the technical field of assembly tools with deformed parts, and in particular to a flaring self-locking nut installation tool. Background Art

[0002] With the steady development of the aerospace industry, the types and quantity of aerospace fasteners are increasing. Among them, the flared self-locking nut is a fastener with a flared deformation structure to effectively fix thin-walled plate parts. The flared self-locking nut has a simple structure and is widely used in the assembly and maintenance of aerospace vehicles such as aircraft, rockets, and satellites.

[0003] like Figure 1 , Figure 2 As shown, the flared self-locking nut includes a flared section 201, an anti-rotation section 202 and a screw sleeve section 203 arranged in sequence along its axial direction. The flared section 201 is not provided with threads and has a thin wall thickness. The anti-rotation section 202 has a larger radial dimension and is provided with a plate-like structure for support and anti-rotation. The screw sleeve section 203 is provided with internal threads for connection with a corresponding bolt. The flared self-locking nut is fixedly installed on the part through the flared deformation of its flared section. During the installation process of the flared self-locking nut, in order to ensure that the flared deformation part of the flared self-locking nut and the part installation hole are tightly fitted, a large pressure is required during the flaring operation. If the flaring forming pressure is not in place, the nut will not be fixed firmly, which will cause the nut to fall off.

[0004] In the prior art, there are installation tools that use hydraulic pressure to expand the expansion self-locking nuts, such as a self-locking nut installation tool disclosed in the Chinese utility model patent with authorization announcement number CN216828297U, which includes a seat body, a connecting block, a punch and a hydraulic device, the connecting block is arranged at the bottom of the seat body, the hydraulic device is arranged on the seat body, and the punch is threadedly connected with the hydraulic rod of the hydraulic device. During installation, the expansion section of the self-locking nut that has not been expanded is extended into the installation hole of the part installation side, so that the groove on the connecting block of the tool accommodates the self-locking section of the self-locking nut and the end face of the groove supports the anti-rotation section of the self-locking nut, so as to pre-fix the self-locking nut to the part installation side; move the handle so that the axis of the punch coincides with the axis of the self-locking nut, operate the hydraulic device, move the hydraulic rod downward and drive the punch downward, the conical end of the punch contacts the expansion section of the self-locking nut and gradually expands it, and finally makes the expansion section close to the conical inner wall of the part installation hole, completing the installation of the self-locking nut. Among them, the self-locking section of the self-locking nut constitutes the screw sleeve section, the seat body constitutes the main seat body, the punch is the expanding punch, the hydraulic device constitutes an expanding drive mechanism for driving the expanding punch to move to expand the nut, the connecting block constitutes a nut limiting seat, the groove of the connecting block constitutes a limiting groove, the part of the connecting block where the groove is set constitutes a limiting part, the limiting part and the punch are arranged relative to each other in the moving direction of the punch, and the limiting part can stop the anti-rotation section of the nut to prevent the nut from exiting the nut mounting hole of the part when the punch is squeezed into the expanding section.

[0005] When the above-mentioned installation tool is used, before the punch squeezes the flared section of the nut, the operator holds the handle to apply a pulling force to the connecting block to keep the self-locking nut in the nut mounting hole of the part. Since the wall thickness of the part where the nut mounting hole is set is usually very thin, and the nut mounting hole is also provided with a relatively long tapered hole section, the axial length of the equal-diameter hole section in the nut mounting hole is very short, and the positioning effect on the flared section of the flared self-locking nut is very limited after the flared section of the flared self-locking nut is inserted. In this way, it is easy for the operator to cause the tool to be skewed relative to the nut mounting hole when the force is not applied properly, and the nut axis is skewed with the center line of the mounting hole. In this way, after the nut is expanded and formed, the nut is fixed in the nut mounting hole of the part at an angle, affecting the nut installation quality and resulting in unqualified products. Summary of the invention

[0006] The purpose of the present invention is to provide a flared self-locking nut installation tool to solve the problem that the current flared self-locking nut installation tool is easily affected by human hand-held force factors, causing the nut to be skewed and affecting the installation quality.

[0007] The technical solution of the flared self-locking nut installation tool of the present invention is: A flaring self-locking nut installation tool, the installation tool includes a main seat body, a nut limiting seat and a flaring punch, the main seat body is provided with a flaring drive mechanism for driving the flaring punch to move, the nut limiting seat is arranged on the main seat body and has a limiting portion arranged opposite to the flaring punch in the moving direction of the flaring punch, the limiting portion is used to be sleeved on the threaded sleeve section of the flaring self-locking nut, the main seat body is provided with a pre-pressing structure, the pre-pressing structure includes a pressing portion and a pressing drive mechanism for driving the pressing portion to move toward the side where the limiting portion is located, the pressing portion is used to press on a side surface of the anti-rotation section of the flaring self-locking nut of the part facing away from the anti-rotation section of the flaring self-locking nut to cooperate with the limiting portion to clamp the anti-rotation section of the flaring self-locking nut and the part to achieve pre-fixation.

[0008] Beneficial effect: The present invention is improved on the basis of the flared self-locking nut installation tool in the prior art, and utilizes a pre-tightening structure to cooperate with a nut limiting seat to clamp the part and the flared self-locking nut, so that the two can be pre-fixed together; in this way, when the flared self-locking nut is installed on the part, the flared section of the flared self-locking nut extends into the nut installation hole of the part, so that the limiting part of the nut limiting seat of the installation tool is sleeved on the thread sleeve section of the flared self-locking nut, and the pressing part is driven to move by the pressing drive mechanism to be pressed on the part, and the pressing part is pressed on a side of the part that is away from the anti-rotation section of the flared self-locking nut. Thereby, the anti-rotation section of the flared self-locking nut can be clamped together with the part by cooperating with the limiting part of the nut limiting seat on the other side of the part, and the flared self-locking nut can be pre-fixed on the part by clamping. Before the flared self-locking nut is formed, the position of the flared self-locking nut in the nut mounting hole of the part is maintained to ensure that the flared self-locking nut is aligned with the nut mounting hole on the part, which is beneficial to ensure the forming quality of the flared section of the flared self-locking nut after expansion by the expansion punch, and is not easily affected by the operator's force on the installation tool when holding the installation tool, causing the nut to tilt and affecting the installation quality.

[0009] Furthermore, more than two clamping drive mechanisms are arranged around the expanding punch, and the clamping drive mechanism comprises a reciprocating telescopic rod, and the end of the telescopic rod constitutes the clamping part.

[0010] Furthermore, the clamping drive mechanism is a cylinder mechanism or a hydraulic cylinder mechanism, the main seat body is provided with a cylinder inner cavity, the telescopic rod is movably arranged in the cylinder inner cavity, the part of the main seat body where the cylinder inner cavity is arranged constitutes the cylinder body of the cylinder mechanism or the hydraulic cylinder mechanism, the telescopic rod constitutes the piston rod of the cylinder mechanism or the hydraulic cylinder mechanism, the main seat body is provided with a main flow channel and a branch flow channel, the number of the branch flow channels is consistent with the number of the clamping drive mechanisms, one end of each branch flow channel is connected to the same main flow channel, and the other end is respectively connected to the cylinder inner cavity of the corresponding clamping drive mechanism.

[0011] Furthermore, the clamping drive mechanism is a cylinder mechanism or a hydraulic cylinder mechanism, the main seat body is provided with a cylinder inner cavity, the telescopic rod is movably arranged in the cylinder inner cavity, the part of the main seat body where the cylinder inner cavity is arranged constitutes the cylinder body of the cylinder mechanism or the hydraulic cylinder mechanism, and the telescopic rod constitutes the piston rod of the cylinder mechanism or the hydraulic cylinder mechanism.

[0012] Furthermore, the piston rod of the clamping drive mechanism has a piston portion adapted to the inner diameter of the cylinder body cavity and a rod body section for extending out of the cylinder body cavity, the clamping portion is arranged at the end of the rod body section, and the part of the rod body section located in the cylinder body cavity is sleeved with a spring, one end of the spring abuts against the side wall of the cylinder body cavity, and the other end abuts against the piston portion.

[0013] Furthermore, the limiting portion is provided with an opening groove, the opening groove is arranged to penetrate in the moving direction of the expanding punch and the groove opening of the opening groove is oriented perpendicular to the moving direction of the expanding punch.

[0014] Furthermore, the flaring punch is provided with a forming cone for extruding the flaring section of the flaring self-locking nut and a forming cylinder connected to the head of the forming cone, and the forming cylinder is used to extend into the part of the flaring section of the flaring self-locking nut for forming an equal-diameter hole.

[0015] Furthermore, the expansion drive mechanism includes a hydraulic cylinder cavity arranged in the main seat body and an expansion thrust rod reciprocatingly arranged in the hydraulic cylinder cavity. The expansion thrust rod cooperates with the part of the main seat body where the hydraulic cylinder cavity is arranged to form an expansion hydraulic cylinder. The expansion thrust rod is connected to the expansion punch to drive the expansion punch to move.

[0016] Furthermore, a handle is provided on the main seat body, and a control button is provided on the handle. The control button is used to communicate with the control system so as to control the clamping drive mechanism and the flaring drive mechanism to perform actions through the control system.

[0017] Furthermore, the nut limiting seat is provided with a threaded connection sleeve, and the threaded connection sleeve is threadedly connected to the head of the main seat body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of a flared self-locking nut; Figure 2 It is an axial side view of the flared self-locking nut; Figure 3 It is a structural schematic diagram of an embodiment of a flared self-locking nut installation tool of the present invention; Figure 4 for Figure 3 A cross-sectional view of a flared self-locking nut installation tool; Figure 5 for Figure 4 A partial enlarged view of the installation structure at the main seat body; Figure 6 for Figure 3 A side view of the main seat body at the head position; Figure 7 for Figure 3 A partial enlarged view of the head of the main seat body; Figure 8 for Figure 5 A partial enlarged schematic diagram of the flaring punch.

[0019] In the figure: 201, expansion section; 202, anti-rotation section; 203, screw sleeve section; 1. Main seat body; 101. Inner cavity of hydraulic cylinder; 102. Inner cavity of air cylinder; 103. Head cavity; 104. Avoidance cavity; 105. Inner ring platform; 2. Nut limit seat; 20. Limiting part; 21. Limiting groove; 22. Threaded sleeve; 3. Handle; 4. Expanding punch; 41. Screw fitting hole; 42. Forming cone; 43. Forming cylinder; 5. Clamping rod; 50. Clamping part; 51. Clamping buffer cap; 6. Clamping buffer spring; 7. Expanding thrust rod; 8. Expanding buffer spring; 9. Tail end cover; 10. Head end cover; 11. Control button; 12. Oil pipe; 13. Air pipe; 14. Control line. DETAILED DESCRIPTION

[0020] The basic concept of the present invention is to utilize a pre-tightening structure in conjunction with a nut limit seat to clamp a part and a flared self-locking nut, and pre-fix the flared self-locking nut and the part together in a clamping manner, thereby ensuring that the flared self-locking nut and the nut mounting hole on the part are aligned with each other, thereby ensuring the installation quality of the flared self-locking nut.

[0021] The following is a specific description with reference to embodiments.

[0022] Embodiments of the flared self-locking nut installation tool of the present invention: The flared self-locking nut installation tool is used to fix the flared self-locking nut in the nut installation hole of the part. Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the flaring self-locking nut installation tool comprises a main seat body 1, a nut limiting seat 2, and a flaring punch 4. The main seat body 1 is provided with a flaring driving mechanism for driving the flaring punch 4 to move to flare the flaring section 201 of the flaring self-locking nut. The nut limiting seat 2 is arranged on the main seat body 1, and the nut limiting seat 2 has a limiting portion 20 which is arranged opposite to the flaring punch 4 in the moving direction of the flaring punch 4, and the limiting portion 20 of the nut limiting seat 2 is used to be sleeved on the threaded sleeve section 203 of the flaring self-locking nut; a pre-pressing structure is provided on the main seat body 1, and the pre-pressing structure includes a pressing portion 50 and a pressing driving mechanism for driving the pressing portion 50 to move toward the side where the limiting portion 20 of the nut limiting seat 2 is located, and the pressing portion 50 of the pre-pressing structure is used to press on a side surface of the anti-rotation section 202 of the flaring self-locking nut of the part facing away from the anti-rotation section 202 of the flaring self-locking nut, and the pressing portion 50 of the pre-pressing structure cooperates with the limiting portion 20 of the nut limiting seat 2 to clamp the anti-rotation section 202 of the flaring self-locking nut and the part to achieve pre-fixation of the flaring self-locking nut and the part.

[0023] When installing the flared self-locking nut on the part, the flared section 201 of the flared self-locking nut extends into the nut mounting hole of the part, so that the limiting part 20 of the nut limiting seat 2 of the installation tool is sleeved on the threaded sleeve section 203 of the flared self-locking nut, and the pressing part 50 is driven to move by the pressing driving mechanism of the pre-pressing structure to press it on the part. The pressing part 50 of the pre-pressing structure is pressed on the side of the anti-rotation section 202 of the flared self-locking nut facing away from the part, so that it can cooperate with the limiting part 20 of the nut limiting seat 2 on the other side of the part to clamp the anti-rotation section 202 of the flared self-locking nut and the part together, so as to tighten the flared self-locking nut. The nut is pre-fixed on the part by clamping, and the position of the flared self-locking nut in the nut mounting hole of the part is maintained before the flaring of the flared self-locking nut is formed, ensuring that the flared self-locking nut is aligned with the nut mounting hole on the part, which is beneficial to ensuring the forming quality of the flared section 201 of the flared self-locking nut after expansion by the flaring punch 4. Since the nut and the part are clamped and fixed, when the operator holds the installation tool, pulling and applying force to the installation tool will not affect the relative position of the nut and the part, and it is not easy to be affected by the factor of the operator applying force to the installation tool when holding the installation tool, causing the nut to be skewed and affecting the installation quality.

[0024] The nut limiting seat 2 is threadedly connected to the head of the main seat body 1, with the head and tail direction of the main seat body 1 as the front-to-back direction, the moving direction of the flaring punch 4 as the front-to-back direction, and moves from back to front when flaring the flaring section 201 of the flaring self-locking nut. The limiting portion 20 of the nut limiting seat 2 is located in front of the flaring punch 4, and the space between the front end of the main seat body 1 and the limiting portion 20 of the nut limiting seat 2 is for the edge of the part with the nut mounting hole to enter. The clamping portion 50 is arranged forward, and the clamping portion 50 moves from back to front to cooperate with the limiting portion 20 to clamp the part and the flaring self-locking nut pre-installed in the nut mounting hole of the part.

[0025] In order to ensure reliable clamping, the pre-clamping structure includes multiple clamping drive mechanisms, each of which is arranged around the flaring punch 4. There are three clamping drive mechanisms in this embodiment, and each of the clamping drive mechanisms is circumferentially distributed on the periphery of the flaring punch 4. The clamping drive mechanism includes a reciprocating telescopic rod, which is a clamping rod 5 and can be telescopically movable forward and backward, and the end of the clamping rod 5 constitutes a clamping portion 50. Since there are three clamping drive mechanisms, there are three clamping rods 5 accordingly, and then there are three clamping portions 50. The clamping portions 50 of multiple clamping rods 5 can form multi-point clamping contact on the periphery of the nut mounting hole of the part, which is conducive to uniform force on the part and reliable clamping. In other embodiments, only one clamping drive mechanism may be provided, that is, only one clamping rod may be provided, and a clamping portion may be used in cooperation with a limiting portion to clamp the parts and the nuts. Of course, in order to increase the clamping contact area, a clamping ring may be provided at the front end of the clamping rod. The inner hole of the clamping ring may avoid the expanding punch, and the clamping ring may be used to clamp the outer portion of the nut mounting hole of the part.

[0026] In this embodiment, the clamping drive mechanism of the pre-clamping structure is a cylinder mechanism. In other embodiments, the clamping drive mechanism may also be a hydraulic cylinder mechanism. The main seat body 1 is provided with a cylinder inner cavity 102, and the cylinder inner cavity 102 constitutes the cylinder inner cavity of the cylinder mechanism. The clamping rod 5 is movably arranged in the cylinder inner cavity 102. The part of the main seat body 1 in which the cylinder inner cavity is arranged constitutes the cylinder body of the cylinder mechanism, and the clamping rod 5 constitutes the piston rod of the cylinder mechanism. The cylinder body of the cylinder mechanism is integrated into the main seat body 1, and there is no need to install a separate cylinder on the main seat body 1, which can save space, reduce the size of the installation tool, and facilitate the installation operation. At the same time, using the cylinder to provide driving force for the clamping part 50 is conducive to improving the moving speed of the clamping part 50. Moreover, each clamping rod 5 is independent of each other, and can adaptively clamp the uneven surface of the part. In other embodiments, a cylinder can be separately provided as needed and fixed at the tail of the main seat body. The main seat body is provided with an escape hole which runs through the front and back for evading the piston rod of the tail cylinder so that the piston rod of the cylinder can extend to the front side of the main seat body.

[0027] In order to facilitate the setting of the air path connecting each cylinder mechanism, a main channel and a branch channel are provided on the main seat body 1, and both the main channel and the branch channel are air channels. Of course, if it is a hydraulic cylinder mechanism, the channel is an oil channel. The number of branch channels is consistent with the number of clamping drive mechanisms, that is, the branch channels correspond to the cylinder cavities 102 one by one, and one end of each branch channel is connected to the same main channel, and the other end is connected to the corresponding cylinder cavity 102. Using a main channel to supply air to each cylinder cavity 102 is conducive to simplifying the airway structure, and each cylinder mechanism shares the same air source. In other embodiments, each cylinder mechanism can also be configured with its own separate air path.

[0028] Combination Figure 5 , Figure 6 , Figure 7The cylinder cavity 102 is arranged at the front of the main seat body 1. A cylinder hole is opened at the front of the main seat body 1. The cylinder hole is a blind hole with the hole opening facing forward. The hole opening of the cylinder hole is sealed and covered by the head end cover 10. The head end cover 10 and the corresponding cylinder hole form the cylinder cavity 102. The clamping rod 5 has a piston portion located in the cylinder cavity 102 and a rod section that can extend outward from the cylinder cavity 102. The rod section is integrally connected with the front end of the piston portion. The outer diameter of the piston portion is greater than the outer diameter of the rod section. The outer diameter of the piston portion is adapted to the inner diameter of the cylinder cavity 102. The piston portion is slidingly sealed and arranged in the cylinder cavity 102. The front end of the rod section is the end and extends out of the cylinder cavity 102. The clamping portion 50 is arranged at the end of the rod section. The part of the rod section located in the cylinder cavity 102 is sleeved with a spring. The spring is a clamping buffer spring 6. One end of the clamping buffer spring 6 abuts on the head end cover 10 and the other end abuts on the piston portion of the clamping rod 5. The head end cover 10 forms the corresponding side wall of the cylinder cavity 102. The clamping buffer spring 6 can be used to buffer the forward movement of the piston rod of the cylinder mechanism and is conducive to the piston rod retreating and resetting. In other embodiments, the clamping buffer spring may not be provided.

[0029] In order to avoid damaging the surface of the part, a clamping buffer cap 51 is provided at the front end of the clamping rod 5. The clamping buffer cap 51 can be made of a plastic or rubber material with a certain elasticity. The clamping buffer cap 51 forms the front end of the clamping rod 5 and forms a clamping portion 50 for clamping on the surface of the part. When the installation tool is not in use, the rear end of the clamping rod 5 abuts against the rear wall of the cylinder cavity 102. The airway connecting port of the cylinder cavity 102 for connecting the airway is located at the rear end of the cylinder cavity 102 to push the piston part forward when supplying air to the cylinder cavity 102. In this embodiment, the air pump configured in the air path connected to the cylinder mechanism can rotate forward and reverse to inflate or exhaust air into the cylinder cavity 102 to move the piston rod forward and backward. The application of this air pump is a known technology and will not be repeated here.

[0030] In this embodiment, the expansion drive mechanism for driving the expansion punch 4 to move adopts a hydraulic cylinder structure. In other embodiments, a cylinder or electric push rod structure can also be used, which can drive the expansion punch 4 to move forward and backward. In order to save space, similar to the cylinder mechanism, the hydraulic cylinder structure of the expansion drive mechanism is also integrated with the main seat body 1. The expansion drive mechanism includes a hydraulic cylinder cavity 101 arranged in the main seat body 1 and an expansion thrust rod 7 reciprocatingly arranged in the hydraulic cylinder cavity 101. The expansion thrust rod 7 cooperates with the part of the main seat body 1 where the hydraulic cylinder cavity 101 is arranged to form an expansion hydraulic cylinder. The part of the main seat body 1 where the hydraulic cylinder cavity 101 is arranged to form the cylinder body of the expansion hydraulic cylinder. Accordingly, the expansion thrust rod 7 forms the piston rod of the expansion hydraulic cylinder. The expansion thrust rod 7 is connected to the expansion punch 4 to drive the expansion punch 4 to move. In other implementations, a hydraulic cylinder may be separately provided at the tail of the main seat body 1, and a relief hole for the piston rod of the hydraulic cylinder to pass through is provided on the main seat body to connect with the expanding punch.

[0031] The flared thrust rod 7 has a piston portion that is slidably sealed with the inner wall of the hydraulic cylinder cavity 101 and a connecting rod portion that extends forward from the hydraulic cylinder cavity 101. A connecting port that is connected to the oil circuit is provided at the rear end of the hydraulic cylinder cavity 101, and the connecting port is located at the rear side of the piston portion of the flared thrust rod 7 to push the piston portion of the flared thrust rod 7 forward when oil is supplied to the hydraulic cylinder cavity 101. In this embodiment, the hydraulic oil pump configured in the oil circuit connected to the flared hydraulic cylinder can rotate forward and reverse to supply or pump oil to the hydraulic cylinder cavity 101 to move the flared thrust rod 7 forward and backward. The application of such an oil pump is a known technology and will not be described in detail here.

[0032] The main body of the main seat body 1 is provided with a head cavity 103, a position avoidance cavity 104, an inner ring platform 105 and a cylinder hole from front to back, and the rear opening of the cylinder hole is sealed with a tail end cover 9 to enclose the hydraulic cylinder cavity 101. The inner diameter of the hydraulic cylinder cavity 101 is larger than the inner diameter of the inner ring platform 105, the inner diameter of the inner ring platform 105 is smaller than the inner diameter of the position avoidance cavity 104, and the inner diameter of the position avoidance cavity 104 is smaller than the inner diameter of the head cavity 103. The head end cover 10 is fixed on the forward step surface at the junction of the head cavity 103 and the position avoidance cavity 104 by screws. The connecting rod part of the expanded thrust rod 7 is guided through the inner ring platform 105, and the front end of the connecting rod part of the expanded thrust rod 7 is threadedly connected with the expanded punch 4. The inner diameter of the position avoidance cavity 104 is larger than the outer diameter of the connecting rod part of the expanded thrust rod 7 and the outer diameter of the expanded punch 4. The head end cover 10 is provided with an escape hole for evading the forward and backward movement of the flaring punch 4 and each clamping rod 5. The clamping portion 50 and the flaring punch 4 move in the same direction. When the installation tool is not in use, the rear end of the flaring thrust rod 7 abuts against the rear wall of the hydraulic cylinder cavity 101, the front end of the flaring punch 4 passes through the head end cover 10 and is located in the head cavity 103, and the front end of the clamping rod 5 passes through the head end cover 10 and is located in the head cavity 103, which can play a protective role.

[0033] The connecting rod portion of the expanded thrust rod 7 located in the hydraulic cylinder inner cavity 101 is sleeved with an expanded buffer spring 8, one end of the expanded buffer spring 8 abuts against the inner ring stage 105, and the other end abuts against the piston portion of the expanded thrust rod 7. The expanded buffer spring 8 can be used to buffer the forward movement of the piston rod of the hydraulic cylinder and facilitate the retreat and reset of the piston rod.

[0034] The nut limiting seat 2 is generally a U-shaped structure, with two side arms arranged at intervals in front and back and a connecting section connecting the two side arms, wherein a limiting portion 20 is arranged at the end of the front side arm, and the thickness of the limiting portion 20 in the front and back direction is less than the thickness of the rest of the front side arm, and the limiting portion 20 is provided with a limiting groove 21, which is an open groove, and the open groove is arranged through the front and back and the groove of the open groove is perpendicular to the front and back direction. The limiting portion 20 is clamped on the screw sleeve section 203 of the flared self-locking nut through the limiting groove 21, and the groove width of the limiting groove 21 is less than the radial dimension of the anti-rotation section 202 of the flared self-locking nut, so as to ensure that the limiting portion 20 can press the anti-rotation section 202 of the flared self-locking nut on the side of the part facing away from the main seat body 1. The open groove can be used to make the nut enter the open groove along the radial direction of the flared self-locking nut, which is convenient for operation. In other embodiments, a limiting hole adapted to the flared self-locking nut can also be set in the limiting portion, so that the limiting portion is sleeved on the nut along the axial direction of the nut.

[0035] The rear side arm of the nut limit seat 2 is integrally formed with a threaded connection sleeve 22, which is threadedly connected to the head of the main seat body 1. The outer peripheral surface of the corresponding head cavity 103 of the main seat body 1 is provided with an external thread for the threaded connection sleeve 22 to be threadedly connected. By screwing the nut limit seat 2, the angle of the nut limit seat 2 can be adjusted to facilitate the hand-held installation tool to reach the corresponding part of the part. In order to enhance the fixing effect, a top screw can be provided on the threaded connection sleeve 22, and the top screw is used to tighten the head of the main seat body 1 to prevent the threaded connection sleeve 22 from rotating. Accordingly, a pressing surface for the top screw to press is processed at the external thread of the head of the main seat body 1. In other embodiments, the nut limit seat may not be threadedly connected to the main seat body, and the nut limit seat sleeve is provided on the head of the main seat body and connected through a positioning pin.

[0036] Combination Figure 8 The rear end of the flaring punch 4 is provided with a threaded hole to be threadedly connected with the stud section at the front end of the flaring thrust rod 7. In order to facilitate the screwing of the flaring punch 4 so as to make it threadedly connected to the flaring thrust rod 7, a screw-fitting hole 41 is provided on the front end surface of the flaring punch 4. The screw-fitting hole 41 is a hexagonal hole to facilitate the screwing tool. In other embodiments, the flaring punch may not be provided with a screw-fitting hole, and the operator can directly screw it by hand.

[0037] The front end of the expanding punch 4 is a pointed structure, and is provided with a forming cone 42 and a forming cylinder 43. The front end diameter of the forming cone 42 is small and the rear end diameter is large. The diameter of the forming cylinder 43 is the same at all axial locations. The forming cylinder 43 is located on the front side of the forming cone 42, and the front part of the forming cone 42 is its head. The forming cylinder 43 is connected to the front end of the forming cone 42, and the forming cylinder 43 and the front end face of the expanding punch 4 are transitioned by chamfering. The nut mounting hole of the part includes a tapered hole section and an equal-diameter hole section. During installation, the tapered hole section of the nut mounting hole is at the rear and the equal-diameter hole section is at the front. The forming conical surface 42 of the flaring punch 4 squeezes the flaring section 201 of the flaring self-locking nut to expand and deform and fit tightly against the inner wall of the tapered hole section of the nut mounting hole of the part. A part of the flaring section 201 of the flaring self-locking nut is deformed into a cone-shaped tube and fixed in the tapered hole section of the nut mounting hole. The flaring section 201 of the flaring self-locking nut has a part located in the equal-diameter hole section of the nut mounting hole of the part and the part constitutes a part for forming the equal-diameter hole. The forming cylindrical surface 43 of the flaring punch 4 extends into the part of the flaring section 201 of the flaring self-locking nut for forming the equal-diameter hole so that the part fits tightly against the inner wall of the equal-diameter hole section of the nut mounting hole of the part, which is conducive to reliable installation. In other embodiments, the flaring punch may not be provided with a forming cylindrical surface, and the forming conical surface of the flaring punch is directly connected to its front end surface.

[0038] The main seat body 1 of the installation tool is provided with a handle 3 for the operator to hold, and the handle 3 is provided with an air channel, an oil channel, and a wire-passing channel. The air channel on the handle 3 is connected with the air channel on the main seat body 1 to supply air to the cylinder cavity 102 or to extract air from the cylinder cavity 102, and the oil channel on the handle 3 is connected with the oil channel on the main seat body 1 to supply oil to the hydraulic cylinder cavity 101 or to extract oil from the hydraulic cylinder cavity 101. A control button 11 is provided on the handle 3, and a control line 14 passes through the wire-passing channel and is connected to the control button 11. The air channel, oil channel, and wire-passing channel on the handle 3 are respectively provided with channel openings at the bottom of the handle 3, and a sealing joint is provided at each corresponding channel opening. The air channel is connected to the air pipe 13 through the sealing joint, and is connected to the air circuit through the air pipe 13. The oil channel is connected to the oil pipe 12 through the sealing joint, and is connected to the corresponding oil circuit through the oil pipe 12. The control button 11 is connected to the matching control system through the control line 14, and can transmit signals to the control system so that the control system controls the corresponding air circuit and oil circuit, and controls the pressing drive mechanism and the flaring drive mechanism to perform corresponding actions by controlling the air pump and the oil pump. In other embodiments, the control button may not be set on the handle according to the operation needs, but the operation may be performed through the corresponding buttons on the air pump control device and the oil pump control device.

[0039] The control button 11 is a two-stage button with two pressing strokes. When the first stage is pressed, the cylinder mechanism works to perform a pre-compression operation. When the second stage is pressed, the expansion hydraulic cylinder works to perform an expansion operation. The control principle of this two-stage button is a known technology and will not be described here. Of course, in other embodiments, two buttons can also be used, one button controls the air circuit and the other button controls the oil circuit.

[0040] The use of the installation tool can realize effective installation of the flared self-locking nut, which is beneficial to ensure the consistency of the flaring forming and ensure the installation quality.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flaring self-locking nut installation tool, the installation tool comprises a main seat body, a nut limiting seat and a flaring punch, the main seat body is provided with a flaring driving mechanism for driving the flaring punch to move, the nut limiting seat is arranged on the main seat body and has a limiting portion arranged opposite to the flaring punch in the moving direction of the flaring punch, the limiting portion is used to be sleeved on the threaded sleeve section of the flaring self-locking nut, and is characterized in that: A pre-pressing structure is provided on the main seat body, and the pre-pressing structure includes a pressing part and a pressing driving mechanism for driving the pressing part to move toward the side where the limiting part is located. The pressing part is used to press on the side surface of the anti-rotation section of the flared self-locking nut of the part that is away from the limiting part to cooperate with the limiting part to clamp the anti-rotation section of the flared self-locking nut and the part to achieve pre-fixation.

2. The flared self-locking nut installation tool according to claim 1, characterized in that: More than two clamping drive mechanisms are arranged around the expanding punch, and the clamping drive mechanisms include a telescopic rod that can move back and forth, and the end of the telescopic rod constitutes the clamping part.

3. The flared self-locking nut installation tool according to claim 2, characterized in that the compression The driving mechanism is a cylinder mechanism or a hydraulic cylinder mechanism, the main seat body is provided with a cylinder inner cavity, the telescopic rod is movably arranged in the cylinder inner cavity, the part of the main seat body where the cylinder inner cavity is arranged constitutes the cylinder body of the cylinder mechanism or the hydraulic cylinder mechanism, the telescopic rod constitutes the piston rod of the cylinder mechanism or the hydraulic cylinder mechanism, the main seat body is provided with a main flow channel and a branch flow channel, the number of the branch flow channels is consistent with the number of the clamping driving mechanism, one end of each branch flow channel is connected to the same main flow channel, and the other end is respectively connected to the cylinder inner cavity of the corresponding clamping driving mechanism.

4. The flared self-locking nut installation tool according to claim 1 or 2, characterized in that the compression The driving mechanism is a cylinder mechanism or a hydraulic cylinder mechanism. The main seat body is provided with a cylinder inner cavity, and the telescopic rod is movably arranged in the cylinder inner cavity. The part of the main seat body provided with the cylinder inner cavity constitutes the cylinder body of the cylinder mechanism or the hydraulic cylinder mechanism, and the telescopic rod constitutes the piston rod of the cylinder mechanism or the hydraulic cylinder mechanism.

5. The flared self-locking nut installation tool according to claim 4, characterized in that the compression The piston rod of the driving mechanism comprises a piston portion adapted to the inner diameter of the cylinder body cavity and a rod section for extending out of the cylinder body cavity, the clamping portion is arranged at the end of the rod section, the part of the rod section located in the cylinder body cavity is sleeved with a spring, one end of the spring abuts against the side wall of the cylinder body cavity, and the other end abuts against the piston portion.

6. The flared self-locking nut installation tool according to claim 1, 2 or 3, characterized in that: The limiting portion is provided with an opening groove, which is through-set in the moving direction of the expanding punch and the groove opening of the opening groove is perpendicular to the moving direction of the expanding punch.

7. The flared self-locking nut installation tool according to claim 1, 2 or 3, characterized in that: The flaring punch is provided with a forming cone for extruding the flaring section of the flaring self-locking nut and a forming cylinder connected to the head of the forming cone. The forming cylinder is used to extend into the part of the flaring section of the flaring self-locking nut for forming an equal diameter hole.

8. The flared self-locking nut installation tool according to claim 1, 2 or 3, characterized in that: The expansion drive mechanism includes a hydraulic cylinder cavity arranged in the main seat body and an expansion thrust rod reciprocatingly arranged in the hydraulic cylinder cavity. The expansion thrust rod cooperates with the part of the main seat body where the hydraulic cylinder cavity is arranged to form an expansion hydraulic cylinder. The expansion thrust rod is connected to the expansion punch to drive the expansion punch to move.

9. The flared self-locking nut installation tool according to claim 1, 2 or 3, characterized in that: A handle is provided on the main seat body, and a control button is provided on the handle. The control button is used to communicate with the control system so as to control the pressing drive mechanism and the flaring drive mechanism to perform actions through the control system.

10. The flared self-locking nut installation tool according to claim 1, 2 or 3, characterized in that: The nut limiting seat is provided with a threaded connection sleeve, and the threaded connection sleeve is threadedly connected to the head of the main seat body.

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