Pallet nut mounting tool, pallet nut mounting quality inspection method

Abstract

Provided is a pallet nut mounting tool for mounting a pallet nut to a wheel disc, comprising a rotating gripper and a punching device movably connected with the rotating gripper, the punching device comprising a punch and a pallet nut fixing seat, the punch being used to apply force to the pallet nut on the wheel disc to extrude and expand the pallet nut, and the pallet nut fixing seat being used to pre-position the bottom end of the pallet nut. The mounting tool can realize multidimensional movement of the punching device, change the coverage radius and height of the punching device, and change the punch specification, so as to realize the mounting of pallet nuts on different models and different pitch circles, meet the mounting and detection of a single pallet nut in different height directions, and have accurate positioning, wide application range and simple use. Also provided is a method for checking the mounting quality of the pallet nut.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aero-engine assembly, in particular to the field of mounting of a backplate nut. BACKGROUND

[0002] The backplate nut is widely used on the engine, can be fixed on the flange edge of the part in advance, will not fall off, and is beneficial to the problem that the nut is difficult to install in a narrow space. The backplate nut is usually in the form of stamping, the head of the nut is expanded into a horn mouth, and is attached to the mounting hole conical mouth of the flange edge of the part.

[0003] Chinese patent CN113941844 proposes an installation and detection tool, which can meet the installation and detection of the backplate nut of the high-pressure turbine after installation, but has the following deficiencies: first, the installation and detection tool is only applicable to a certain type of backplate nut installation and detection, and is connected with the turbine disc by a fixed size, which cannot meet the installation of backplate nuts of different types of high-pressure turbines, and the generalization of the tool is poor, which increases the types, cost and management difficulty of the tool; second, the deformation of the backplate horn mouth is realized by the pressure generated by the screw thread transmission, and for the backplate nut with a larger horn mouth thickness, a larger external force is needed to realize the deformation of the conical mouth, and the screw rod transmission method needs the operator to use a larger turning force to drive the screw rod to rotate, especially for the backplate nut installation quality detection, which needs the operator to spend a lot of turning force, and the working strength of the operator is large, which directly leads to low installation efficiency of the backplate nut. In addition, the screw rod transmission method also easily affects the angular direction of the backplate nut. SUMMARY

[0004] An object of the present application is to provide a backplate nut installation tool with generalization and convenience.

[0005] To achieve the above-mentioned object, the backplate nut installation tool for installing the backplate nut on the disc includes a rotating gripper and a stamping device, the stamping device is movably connected with the rotating gripper, and includes a stamping piece and a backplate nut fixing seat, the stamping piece is used to apply force to the backplate nut on the disc to extrude and expand the backplate nut, and the backplate nut fixing seat is used to position the bottom end of the backplate nut.

[0006] In one or more embodiments, the installation tool further includes a workbench, and the rotating gripper is rotatably arranged on the workbench.

[0007] In one or more embodiments, the backplate nut fixing seat includes a connecting part and an adapter part, the connecting part is rotatably connected with the stamping device, and the adapter part is parallel to the disc surface and includes a supporting limiting hole or a supporting limiting groove for cooperating with the bottom of the backplate nut.

[0008] In one or more embodiments, the punching device comprises an adapter section and a punching seat, the adapter section is used to be movably connected with the rotary holder, and the punching seat is used to carry the punching piece and the lug nut fixing seat.

[0009] In one or more embodiments, the punching piece comprises a pressure cylinder, a punch, a telescopic rod and a spring, the punching seat comprises a cavity boss, the punch, the telescopic rod and the spring are arranged in the punching seat, the spring is sleeved outside the telescopic rod and abuts against the cavity boss, and the telescopic rod is used to receive the pressure of the pressure cylinder and transmit the pressure to the punch.

[0010] In one or more embodiments, the punching piece further comprises a pressure gauge arranged on the pressure cylinder.

[0011] In one or more embodiments, the adapter section comprises a connecting hole, and the rotary holder comprises a supporting rod used to be matched with the connecting hole.

[0012] In one or more embodiments, the workbench comprises an annular clamping groove, and the rotary holder comprises a boss used to be clamped with the annular clamping groove.

[0013] In one or more embodiments, the rotary holder comprises a clamping plate, a supporting rod, a supporting rod supporting plate and a vertical rod, the clamping plate comprises the boss, the vertical rod is arranged on the clamping plate, the supporting rod is fixedly connected with the supporting rod supporting plate, and the supporting rod supporting plate is movably arranged on the vertical rod.

[0014] In one or more embodiments, the workbench comprises an outer circumferential cylindrical side surface, and the rotary holder further comprises a rolling column arranged between a pair of clamping plates and used to be rolling matched with the outer circumferential cylindrical side surface.

[0015] Another object of the present application is to provide a lug nut installation quality inspection method, which uses the above lug nut installation tool for detection, and comprises the following steps: threadedly connecting a force applying bolt on the lug nut; setting the punching pressure of the punching piece; using the punching piece to extrude the force applying bolt, and checking whether the lug nut is detached from the disc.

[0016] The above lug nut installation tool realizes multi-dimensional movement of the punching device by cooperation of the punching device, the rotary holder and the workbench, changes the covering radius and the covering height of the punching device, realizes lug nut installation on different models and different pitch circles, meets lug nut installation and detection in different height directions, and can also operate the single lug nut on the disc one by one; the lug nut fixing seat can be positioned at the bottom of the lug nut, ensures that the lug nut does not tilt during installation, maintains accurate positioning, and improves installation quality. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is a schematic diagram showing the installation position of the support plate nut on the wheel;

[0019] Figure 2 This is a cross-sectional view of one embodiment of the pallet nut installation tool;

[0020] Figure 3 This is a schematic diagram of an embodiment with a worktable;

[0021] Figure 4 This is a schematic diagram showing the coordination of the stamping device, rotary clamp, and wheel.

[0022] Figure 5 This is a cross-sectional view of one embodiment of the stamping device;

[0023] Figure 6 This is a schematic diagram of an embodiment of the stamping device in conjunction with a wheel;

[0024] Figure 7 This is a schematic diagram of one embodiment of the tray nut fixing seat;

[0025] Figure 8 This is a perspective view of the stamping device;

[0026] Figure 9 It is a cross-sectional view of the rotary clamp in conjunction with the worktable;

[0027] Figure 10 This is a schematic diagram of the rotary clamp engaging with the worktable.

[0028] Explanation of reference numerals in the attached figures

[0029] 1. Trumpet mouth

[0030] 2. Support plate nut

[0031] 3 Roulette

[0032] 4. Stamping device

[0033] 10 Stamped parts

[0034] 11. Transition Section

[0035] 12 stamping base

[0036] 13 Telescopic poles

[0037] 14 Punch

[0038] 15. Support plate nut fixing seat

[0039] 16 Springs

[0040] 17. Internal cavity boss

[0041] 18 Pressure Cylinder

[0042] 19. Pressure gauge

[0043] 20 Rotary clamp

[0044] 21 Plywood

[0045] 22 Support rods

[0046] 23 Connecting rod

[0047] 25 poles

[0048] 26 Bracket Support Plate

[0049] 27 Clamping nut

[0050] 28 Connectors

[0051] 29 Guide rod

[0052] 30 workbenches

[0053] 31 Circular slot

[0054] 112 Connecting hole

[0055] 151 Connecting part

[0056] 152 Adapter Section

[0057] 153 Supporting and limiting groove

[0058] 154 Quick-release pin

[0059] 201 convex platform

[0060] 250 base Detailed Implementation

[0061] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0062] It should be noted that these and other subsequent drawings are only as an example, which is not drawn in accordance with the conditions of the same scale, and should not be taken as a limitation on the actual claimed scope of the invention. The term "rotation" refers to the circular motion around a center, "movement" refers to the translation in a plane, such as up and down, back and forth, left and right movement.

[0063] Figure 1 The installation position of the pallet nut 2 on the wheel disc 3 is shown. The wheel disc 3 is provided with a nut installation hole with a bell mouth 1, and the pallet nut 2 is pre-inserted into the nut installation hole. By the impact of the pressure device from top to bottom, the flaring of the pallet nut 2 matching the bell mouth 1 is generated. In the conventional installation mode, the bell mouth is generated by the pressure generated by the thread. This mode has two problems: first, a larger external force is required for the pallet nut with a larger thickness; second, the pallet nut may rotate in the direction of the thread rotation. In addition, it is also necessary to ensure that the pallet nut does not deviate from the direction of its own axis (i.e. the axial direction of the wheel disc 3) during installation to ensure installation quality. For different specifications of the wheel disc or the pallet nut, the tooling also needs to be versatile.

[0064] The pallet nut installation tool described in the present disclosure is used for the installation of the pallet nut 2. As shown in Figure 4 , the pallet nut installation tool includes a stamping device 4 and a rotating clamp 20, Figure 3 The structure with a workbench 30 is also shown.

[0065] The rotating clamp 20 is movably connected with the stamping device 4. The stamping device 4 includes a stamping piece 10 and a pallet nut fixing seat 15. The stamping piece 10 is used to apply force to the pallet nut 2 on the wheel disc 3 to extrude the flared pallet nut 2, and the pallet nut fixing seat 15 is used to pre-position the bottom end of the pallet nut 2. In this mode, the stamping device can move horizontally and vertically on the fixed frame without rotating function, and the turbine disc can rotate around its own axis. The installation and detection of the pallet nut at different angles are achieved by rotating the turbine disc.

[0066] In the embodiment shown in Figure 3 , the rotating clamp 20 is also rotatably arranged on the workbench 30. Thus, the rotating clamp can rotate along the annular groove of the annular workbench, driving the stamping device to rotate 360 degrees along the fixed axis. The stamping device can move reciprocally along the rotating clamp support rod to change the position in the radial direction and the axial direction. The pallet nut installation tool can realize the installation of the pallet nut 2 one by one around the wheel disc 3, and can also satisfy the installation of the pallet nut at different angles, different models and different pitch circles, having greater flexibility.

[0067] A specific embodiment of the stamping device 4 is described with reference to Figure 5 and Figure 6As shown, the puncher 10 includes a transition section 11 and a punch seat 12, the transition section 11 is fixedly connected with the punch seat 12 by a structure such as a connecting rod 23 or is integrally connected with the punch seat 12.

[0068] The transition section 11 is movably connected with the rotary holder 20, and the punch seat 12 is provided with the puncher 10 and the fixed seat 15 of the plate nut. The transition section 11 includes a connecting hole 112, and the rotary holder 20 includes a supporting rod 22 for being matched with the connecting hole 112, the transition section 11 is connected with the two supporting rods 22 of the rotary holder 20 through the connecting hole 112, and can freely reciprocate on the two supporting rods 22 to change the coverage radius of the puncher and realize the installation of the plate nut on different models and different pitch circles.

[0069] The puncher 10 includes a pressure cylinder 18, a punch 14, a telescopic rod 13 and a spring 16, the punch seat 12 includes a cavity boss 17, the punch 14, the telescopic rod 13 and the spring 16 are arranged in the punch seat 12, the spring 16 is sleeved outside the telescopic rod 13 and abuts against the cavity boss 17, and the telescopic rod 13 is used for receiving the pressure of the pressure cylinder 18 and transmitting the pressure to the punch 14. The pressure cylinder 18 pressurizes the telescopic rod 13, pushes the telescopic rod 13 to move and extrudes the spring 16, realizes the downward movement of the punch 14, extrudes the head of the plate nut and expands the head. Preferably, a pressure gauge 19 is arranged on the pressure cylinder 18, the pressurization value of the pressure cylinder 18 can be judged through the pressure gauge 19, and the external force output required by the installation and detection of the plate nut is preferably realized. After the pressure cylinder 18 is depressurized, the telescopic rod can automatically rebound under the action of the spring 16, drives the telescopic rod 13 to move upwards, and then realizes the disengagement of the punch 14 from the plate nut 2.

[0070] Preferably, the punch 14 is fixed on the head of the telescopic rod 13 in a screwing manner, can be quickly replaced, and different specifications of the punch are replaced to meet the installation of plate nuts of different sizes.

[0071] In order to ensure that the plate nut 2 does not deviate from the axis during the punching process, in an embodiment, the plate nut fixed seat 15 includes a connecting part 151 and a transition part 152, as shown in Figure 7 and Figure 8 The connecting part 151 is rotatably connected with the puncher 4, such as being connected with the punch seat 12 through a plurality of quick-release pins 154. The transition part 152 is parallel to the disc surface of the wheel disc 3 and includes a supporting limiting hole or a supporting limiting groove for being matched with the bottom of the plate nut 2. The opening of the space below the plate nut can be realized by overturning or removing the plate nut fixed seat 15. Figure 8 The structure of the supporting limiting groove 153 is shown, which is located at the bottom of the plate nut 2 and is used for fixing the plate nut 2 on the bottom side of the wheel disc to ensure that the plate nut 2 does not deviate relative to the axis thereof during the installation process.

[0072] Preferably, the punch seat 12 is provided with different bolt holes to meet the fixing of the nut fixing seat in different postures.

[0073] Figure 9 and Figure 10 The connection relationship between the workbench 30 and the rotary holder 20 is shown. The rotary holder 20 includes a clamping plate 21, a supporting rod 22, a supporting rod support plate 26 and a vertical rod 25, the clamping plate 21 includes a boss 201, the vertical rod 25 is arranged on the clamping plate 21, the supporting rod 22 is fixedly connected with the supporting rod support plate 26, and the supporting rod support plate 26 is movably arranged on the vertical rod 25. The workbench 30 includes an annular clamping groove 31, and the boss 201 is clamped with the annular clamping groove 31. The annular clamping groove 31 acts as a movement track of the rotary holder 20, so that the rotary holder 20 rotates around the axis of the wheel disc, and meanwhile, the cooperation of the boss and the groove can limit the rotary holder 20 in the radial direction, so that the rotary holder 20 can be stably fixed on the edge of the workbench 30. The rotary holder 20 further includes rolling columns 24 arranged between a pair of clamping plates, and the rolling columns 24 are clamped between the two clamping plates 21 through a connecting piece 28, so as to form a clamping structure. The clamping structure is clamped in the annular clamping groove 31 at the edge of the circular workbench, and the inner rolling columns 24 can roll on the outer cylindrical surface 32 of the workbench, so as to effectively reduce the rotating resistance of the rotary holder.

[0074] In one embodiment, the vertical rod 25 includes a rod body and a base 250, and the base 250 is fixed on the clamping plate 21 at the upper side. The rod body of the vertical rod 25 is threaded, and the supporting rod support plate 26 is clamped on the vertical rod 25 through two clamping nuts 29 arranged above and below, so as to realize the height adjustment of the supporting rod support plate 26 in the vertical direction, and further drive the punch device 4 to move up and down within a certain range along with the supporting rod 22, so as to realize the close fixing of the nut before the punch. The punch device 4 can move up and down in the vertical direction, so that the application range of the nut installation and detection tool is further expanded, and the installation and detection of the nut in different height directions are met.

[0075] The rotary support seat 20 is further provided with a guide rod 29, which cooperates with a guide hole on the supporting rod support plate 26, so that the supporting rod support plate 26 can only move along the axis of the vertical rod, and the punch device is prevented from deflecting during the rotation, so as to improve the positioning accuracy of the punch device.

[0076] The assembly of the nut installation tool and the installation process of the nut are introduced below.

[0077] The wheel disc 3 is placed at the center of the workbench 30, and the axis of the wheel disc 3 is substantially consistent with the axis of the workbench 30.

[0078] By adjusting the position of the two clamping nuts 27 on the vertical rod 25, the axial height of the stamping device 4 is adjusted by means of the supporting plate 26 and the supporting rod 22, so as to meet the installation height requirement of the supporting nut 2 in the vertical direction.

[0079] The bottom end of the supporting nut 2 is positioned on the supporting nut fixing seat 15. The rotating clamp 20 is rotated as a whole, and the stamping device 4 is moved as a whole in the radial direction inward or outward, so that the supporting nut 2 is aligned with the mounting hole.

[0080] The lower clamping nut 27 is screwed, the stamping device 4 is allowed to move upward, the supporting nut 2 is clamped and fixed with the installation edge of the turbine disc 3, the pressure cylinder 18 is pressurized, the telescopic rod 13 is pushed to move downward with the punch 14, the supporting nut 2 is expanded, and the head of the supporting nut 2 is expanded into a trumpet shape and is adsorbed on the trumpet 1 of the mounting hole.

[0081] The extrusion force can be controlled by the oil pressure of the pressure cylinder 18, and the oil pressure value is displayed by the pressure display. The pressure gauge 19 stops pressurizing when the corresponding pressure value reaches the specified value F1.

[0082] The pressure cylinder 18 is depressurized, the punch 14 is retracted under the elastic force of the spring 16, and is separated from the supporting nut 2. The lower clamping nut is loosened, the stamping device 4 is moved downward as a whole, and the clamping state of the stamping device 4 and the supporting nut 2 is released.

[0083] The above steps are repeated to complete the independent installation of the remaining supporting nuts on the disc.

[0084] After installation is completed, the quick release pin between the connecting part 151 and the stamping seat 12 is pulled out, the supporting nut fixing seat 15 is turned upward and then reinserted into the quick release pin for fixation, as shown in Figure 5 , or the quick release pin between the connecting part 151 and the stamping seat 12 is pulled out, and the supporting nut fixing seat 15 is removed from the stamping seat 12, as shown in Figure 6 .

[0085] The above supporting nut installation tool effectively improves the universality of the installation and detection tool of the supporting nut through the flexible cooperation of the workbench, the rotating clamp and the stamping device, reduces the types of tooling, and meets the installation and detection of different specifications of supporting nuts on different pitch circles of different models. The tool structure is simple, and the production cost is effectively reduced. The supporting and limiting groove or hole at the bottom of the supporting nut fixing seat plays a role in positioning the bottom end of the supporting nut, avoids the angular inclination of the supporting nut, and improves the installation quality.

[0086] In combination with the above description of the pallet nut installation tool, it can be understood that a pallet nut installation quality inspection method is also provided. The method includes the following steps: threadedly connecting a force bolt to the pallet nut; setting a punch pressure of a punch; using the punch to press the force bolt; and checking whether the pallet nut is detached from the wheel disc. If the pallet nut is detached from the wheel disc, it indicates that the installation is unqualified.

[0087] For example, in the pallet nut installation quality inspection process, the adapter bolt is screwed into the threaded hole of the pallet nut 2, the punch device 4 is translated by rotating the rotary clamp 20, the punch 14 is aligned with the axis of the adapter bolt, and the pressure cylinder is pressurized according to the specified pressure value F2 of the pallet nut inspection. The pressure cylinder is depressurized, the punch is retracted, and the punch is out of contact with the adapter bolt. Whether the pallet nut is detached from the installation hole is observed, and the installation quality of the pallet nut is determined. The above steps are repeated to complete the quality inspection process of the remaining pallet nuts on the wheel disc.

[0088] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not depart from the technical solution of the present application, falls within the protection scope defined by the claims of the present application.

Claims

1. A pallet nut installation tool, used to install a pallet nut (2) onto a wheel (3), characterized in that, include: Rotary clamp (20); as well as The stamping device (4), which is movably connected to the rotary clamp (20), includes a stamping part (10) and a pallet nut fixing seat (15). The stamping part (10) is used to apply force to the pallet nut (2) on the wheel (3) to compress and expand the pallet nut (2). The pallet nut fixing seat (15) is used to preposition the bottom end of the pallet nut (2). The installation tool also includes a workbench (30), on which the rotary clamp (20) is rotatably mounted, and the wheel is placed at the center of the workbench (30); The stamping device (4) includes a transition section (11) and a stamping seat (12). The transition section (11) is movably connected to the rotary clamp (20), and the stamping seat (12) is used to support the stamped part (10) and the pallet nut fixing seat (15). The adapter section (11) includes a connecting hole (112), and the rotary clamp (20) includes a support rod (22) for engaging with the shaft hole of the connecting hole (112); The worktable (30) includes an annular groove (31), and the rotary clamp (20) includes a boss (201) for engaging with the annular groove (31); The rotating clamp (20) includes a clamping plate (21), a support rod (22), a support rod support plate (26), and a vertical rod (25). The clamping plate (21) includes the boss (201). The vertical rod (25) is disposed on the clamping plate (21). The support rod (22) is fixedly connected to the support rod support plate (26). The support rod support plate (26) is movably disposed on the vertical rod (25). The worktable (30) includes an outer cylindrical side surface (32), and the rotary clamp (20) also includes a rolling column (24) disposed between a pair of clamping plates for rolling engagement with the outer cylindrical side surface (32).

2. The pallet nut installation tool as described in claim 1, characterized in that, The tray nut fixing seat (15) includes a connecting part (151) and an adapter part (152). The connecting part (151) is rotatably connected to the stamping device (4). The adapter part (152) is parallel to the disk surface of the wheel (3) and includes a support limiting hole or support limiting groove for cooperating with the bottom of the tray nut (2).

3. The pallet nut installation tool as described in any one of claims 1, characterized in that, The stamping part (10) includes a pressure cylinder (18), a punch (14), a telescopic rod (13), and a spring (16). The stamping base (12) includes an inner cavity boss (17). The punch (14), the telescopic rod (13), and the spring (16) are disposed in the stamping base (12). The spring (16) is sleeved on the outside of the telescopic rod (13) and abuts against the inner cavity boss (17). The telescopic rod (13) is used to receive the pressure of the pressure cylinder (18) and transmit it to the punch (14).

4. The pallet nut installation tool as described in claim 3, characterized in that, The stamped part (10) also includes a pressure gauge (19) mounted on the pressure cylinder (18).

5. A method for inspecting the installation quality of the pallet nut, characterized in that, The method of testing using the pallet nut installation tool as described in any one of claims 1-4 includes the following steps: Connect the force-applying bolt to the plate nut; Set the stamping pressure of the stamped part; Use a stamping tool to press the force-applying bolt and check whether the pallet nut has fallen off the wheel.

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