Locking wrench for applying preload to repaired inertial platform bearing

Abstract

The utility model discloses a locking wrench for applying preload to a repaired inertial platform bearing. The locking wrench comprises a locking buckle, a connecting frame, a connecting rod and a cutter bar. The locking buckle is connected with the inertial platform bearing locking nut in a matched mode. The connecting frame is used for avoiding wire harnesses and other parts near the inertial platform bearing; the connecting rod is used for connecting the connecting frame and the cutter bar; and the cutter bar can be fixed on a universal torque screwdriver. According to the embodiment of the utility model, the preload applied to the repaired inertial platform bearing can be measured under the condition that the inertial platform is not decomposed, so that the performance requirement of an inertial navigation system for stabilizing a loop is met, the maintenance period of the inertial platform is greatly shortened, and secondary faults caused by decomposition of the inertial platform are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the inertial platform installation technology, concretely relates to a kind of repair inertial platform bearing pre-load exerting locking wrench. BACKGROUND

[0002] Inertial platform bearing support assembly should be preloaded to eliminate clearance after assembly and improve load capacity. The pre-load of the repaired inertial platform bearing is generally reduced, which cannot meet the normal operation requirements of the stable loop of the inertial navigation system, and needs to be reloaded each time.

[0003] However, according to the method of using a special stiffness tester to apply pre-load by fixed pressure pre-tightening of the bearing during the production and installation process of the inertial platform, the repaired inertial platform needs to be disassembled to some extent, and multiple disassembly can cause problems such as reduced plug-in force, poor contact, frequent wire welding, shortened length, and increased stress, which not only prolongs the maintenance cycle, but also easily causes secondary faults. Moreover, the existing method cannot test the pre-load of the repaired inertial platform, and cannot establish the relationship between the pre-load and the performance of the inertial navigation system.

[0004] How to test and apply pre-load to the repaired inertial platform bearing without disassembling the inertial platform, thereby shortening the maintenance cycle and reducing the frequency of failure, has become a technical problem to be solved in the field. UTILITY MODEL CONTENTS

[0005] To solve at least one of the technical problems in the prior art, the utility model provides a repaired inertial platform bearing pre-load exerting locking wrench.

[0006] The utility model provides a locking wrench for applying pre-load to the repaired inertial platform bearing, which can control the pre-load by applying a specific tightening torque to the locking nut of the bearing without disassembling the inertial platform.

[0007] The technical solution adopted by the utility model is:

[0008] A repaired inertial platform bearing pre-load exerting locking wrench, comprising: a knife bar, a connecting rod, and a connecting frame.

[0009] One end of the connecting rod is connected to the knife bar, and the other end is connected to the connecting frame.

[0010] The connecting frame is provided with a locking buckle at each end, and the two locking buckles are symmetrical flat plate structures; the locking buckle is used to cooperate with the locking nut.

[0011] The knife bar is used to connect the torque screw.

[0012] Further, the locking buckle and the locking nut slot are in transition fit.

[0013] Further, the depth of the locking buckle is greater than the sum of the depth of the locking nuts.

[0014] Further, the outer side arc size of the connecting frame is designed according to other parts of the inertial platform bearing to avoid interference.

[0015] Further, the connecting frame and the connecting rod are detachably connected.

[0016] Further, the locking wrench comprises a series of connecting frames with different sizes.

[0017] The locking wrench is made of 2Cr13 stainless steel.

[0018] The locking wrench is subjected to quenching and tempering treatment, and has a hardness of HRC 28-32.

[0019] The utility model discloses a method for exerting a specific tightening torque on the locking nut of the repaired inertial platform bearing without disassembling the inertial platform, thereby controlling the pre-load, greatly shortening the maintenance period and reducing the number of failures.

[0020] The utility model also can read the pre-load size of the repaired platform through the method of marking the position of the locking nut of the repaired inertial platform bearing and then loading the torque screwdriver to the same position, thereby establishing the corresponding relationship between the pre-load size of the inertial platform bearing and the performance of the inertial navigation system, and providing data support for the establishment of the maintenance standard. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 1 is a schematic view of a locking wrench for exerting a pre-load on a repaired inertial platform bearing. Figure 2 Fig. 2 is a schematic view of another locking wrench with a connecting frame of another shape, which is suitable for different models of products.

[0022] 1. locking buckle 2. connecting frame 3. connecting rod 4. cutter bar DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model.

[0024] As Figure 1As shown, a kind of repair inertia platform bearing preload application locking wrench, comprising: locking buckle 1, connecting frame 2, connecting rod 3 and cutter bar 4. Wherein locking buckle 1 is transitionly matched with the locking nut slot of inertia platform bearing;Connecting frame 2 circular arc size envelops the line bundle at the locking nut of different models of inertia platform bearing;Connecting rod 3 connects connecting frame 2 with cutter bar 4;Cutter bar 4 can be installed on the moment screw cutter;Locking wrench adopts 2Cr13 stainless steel material;Locking wrench is treated by quenching and tempering, and hardness HRC 28-32.

[0025] In some embodiments, the depth size of locking buckle 1 should be slightly longer than the total size of the locking nut of this model of inertia platform bearing, to ensure that the operator will not be injured by the nearby line bundle when rotating the wrench due to the sliding of locking buckle.

[0026] In some embodiments, in addition to the line bundle, there are other parts at the locking nut of inertia platform bearing, and the inner and outer circular arc sizes of connecting frame 2 should be designed according to the positions of other parts and line bundle at the locking nut of each model of inertia platform bearing, so that they cannot interfere with other parts and line bundle in space.

[0027] In some embodiments, the bearing locking nut accessory space of inertia platform is narrow without disassembly, and the locking buckle 1 and connecting frame 2 cannot be stretched in. At this time, the locking buckle 1 and connecting frame 2 can be detached, and the tweezers welded and fixed on the connecting rod 3 can replace the functions of the locking buckle 1 and connecting frame 2.

[0028] The utility model also provides a kind of method for testing the size of remaining load of repair inertia platform. The method can include the following steps:

[0029] S101, mark a line on the locking nut of repair inertia platform and adjacent parts with a marker pen;

[0030] S102, unload repair platform preload with locking wrench;

[0031] S103, load to the locking nut and adjacent part line coincides with locking wrench, at this time, the moment represents the remaining load of repair inertia platform.

[0032] The above-described embodiments only express the preferred embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that, for ordinary skilled person in the art, without departing from the concept of the utility model, a number of variations and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A rework inertial platform bearing preload application locking wrench characterized by: The locking wrench comprises a cutter bar, a connecting rod and a connecting frame; One end of the connecting rod is connected with the cutter bar, and the other end is connected with the connecting frame; The connecting frame is provided with a locking buckle at each end, and the two locking buckles are symmetrical flat plate structures; the locking buckles are used for cooperating with the locking nuts; The cutter bar is used for connecting the torque screw.

2. The locking wrench of claim 1, wherein: The locking buckles and the locking nut slot are in transition fit.

3. The locking wrench of claim 1, wherein: The depth of the locking buckle is greater than the sum of the depths of the locking nuts.

4. The locking wrench of claim 1, wherein: The outer side arc size of the connecting frame is designed according to other parts of the inertia platform bearing to avoid interference.

5. The locking wrench of claim 1, wherein: The connecting frame and the connecting rod are detachably connected.

6. The locking wrench of claim 5, wherein: The locking wrench comprises a series of connecting frames with different sizes.

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