Chain transmission tightening torque switching device and method

Abstract

The invention relates to a chain transmission tightening torque switching device and method. The requirement for bolt tightening torque control of important connecting parts is met. The device comprises a driving chain wheel, a driven chain wheel and a chain which are installed in a matched mode, the driving chain wheel and the driven chain wheel are fixed to the two ends of a chain wheel supporting frame, one end of a main transmission shaft of the driving chain wheel is provided with an inner square groove, and one end of a driven shaft of the driven chain wheel is provided with an outer square tenon. Firstly, a standard socket spanner is installed on a square tenon outside a driven chain wheel; then the standard socket spanner is connected with a bolt to be tightened and fixed in force, and a driving chain wheel is led out to an open space; then a conventional torque wrench is inserted into the square groove in the driving chain wheel, and the torque wrench is operated in the open space to tighten the bolt; finally, force fixing is conducted according to the use requirement of the bolt, and the final bolt tightening torque value is obtained by multiplying the torque wrench display value by the switching device transmission coefficient. The device is suitable for a narrow space; long-distance torque transmission can be realized; and standard design is adopted, so that various standard tools can be used.

Description

Technical Field

[0001] The invention relates to a fixed torque device for tightening bolts in a narrow space during the general assembly of aviation and aerospace, and in particular to a chain drive tightening torque transfer device and method. Background Art

[0002] Bolt and nut connection is a common connection method in the process of aviation and aerospace assembly. By tightening the bolts and nuts to generate pre-tightening stress, the two connected parts are tightly fitted. The purpose of pre-tightening is to enhance the reliability and tightness of the connection to prevent gaps or relative slippage between the connected parts after loading. Due to the different materials and functions of the bolts and connected parts, the requirements for the pre-tightening force of the bolts and nuts are also different. The pre-tightening force of the bolts is usually controlled by controlling the tightening torque method.

[0003] In the process of aviation and aerospace assembly, engine installation, pipeline docking, cabin docking and other important parts are connected. In order to ensure the reliability of the connection, the bolt tightening torque is usually controlled to ensure the docking reliability. However, aviation and aerospace products are compact in design, with high assembly density and complex internal structure. The wrench movement space in some areas is limited. The standard wrench cannot be used to tighten the connection bolts. Conventional fixed force wrenches are usually larger than standard wrenches, and more wrench movement space is required to achieve the fixed torque of the bolts. Therefore, it is necessary to design a device and method that can complete the fixed torque of bolt tightening in a small space to achieve the installation quality control of important connection parts. Summary of the invention

[0004] The purpose of the present invention is to provide a chain drive tightening torque conversion device and method for a narrow space, which can meet the bolt tightening torque control of important connection parts and ensure the installation quality.

[0005] The present invention is achieved by the following technical solutions:

[0006] A chain drive tightening torque conversion device comprises a driving sprocket, a driven sprocket and a chain which are installed in coordination. The driving sprocket and the driven sprocket are fixed at two ends of a sprocket support frame. One end of the main transmission shaft of the driving sprocket is designed with an inner square groove, and one end of the driven shaft of the driven sprocket is designed with an outer square tenon.

[0007] A protective shell is installed on the outer side of the sprocket support frame.

[0008] The main transmission shaft end of the driving sprocket is fixedly connected with a wrench block with an inner square groove, and one end of the driven shaft of the driven sprocket is fixedly connected with an outer square tenon block.

[0009] The transmission ratio of the driving sprocket and the driven sprocket is 1:1.

[0010] The main transmission shaft and the driving sprocket are designed as an integrated whole, and the driven shaft and the driven sprocket are designed as an integrated whole.

[0011] The inner square groove is connected to a conventional torque wrench and made into a series size 1 / 4 〃 、3 / 8 〃 , 1 / 2 〃 ; External square tenon connected with standard socket wrench, made into series size 1 / 4 〃 、3 / 8 〃 , 1 / 2 〃 .

[0012] A chain drive tightening torque conversion method comprises the following steps:

[0013] 1) Install the driving sprocket, driven sprocket and chain on the sprocket support frame;

[0014] 2) Install the protective shell on the sprocket support frame;

[0015] 3) First install the standard socket wrench on the outer square tenon of the driven sprocket; then connect the standard socket wrench to the bolt to be tightened, and lead the driving sprocket to an open space; then insert a conventional torque wrench into the inner square groove of the driving sprocket, and operate the torque wrench to tighten the bolt in the open space; finally, tighten the bolt according to the use requirements, and obtain the final bolt tightening torque value by multiplying the torque wrench display value by the transmission coefficient of the adapter.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) Suitable for bolt tightening torque conversion device in narrow space;

[0018] (2) It can realize torque transmission over a long distance;

[0019] (3) Improves the operability and convenience of bolt force setting in narrow spaces;

[0020] (4) Standardized design allows the use of multiple standard tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic structural diagram of a chain drive tightening torque conversion device. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, the design idea of ​​the device of the present invention is:

[0023] (1) Selection of transmission mode: Chain transmission is characterized by no elastic sliding and overall slippage, small overall size, compact structure, high transmission efficiency, and is suitable for low-speed and heavy-load working links. Therefore, the tightening torque conversion device preferably adopts chain transmission.

[0024] (2) Sprocket and chain design: The driving sprocket 01, the driven sprocket 02 and the chain 03 are used together. It is preferred to design the sprocket and chain in accordance with the standard GB / T1243 "Short pitch precision roller chain, bushing chain, accessories and sprockets for transmission". The transmission ratio of the driving sprocket 01 and the driven sprocket 02 is 1:1. The operating conditions of the driving end and the driven end of the chain drive tightening torque adapter are relatively stable, and the operating coefficient K A It can be 1.0~1.3.

[0025] (3) Transmission shaft: The main transmission shaft and the driving sprocket are designed as an integrated whole. The other end is designed as an inner square groove 011, which can be connected with a conventional torque wrench and can be made into a series size 1 / 4 〃 、3 / 8 〃 , 1 / 2 〃 The driven shaft and driven sprocket are designed as an integrated whole. The other end is designed as an external square tenon 051, which is connected with a standard socket wrench 04 and can be made into a series size 1 / 4 〃 、3 / 8 〃 , 1 / 2 〃 wait.

[0026] (4) Sprocket support frame and protective shell: The sprocket support frame 05 is used to fix the two sprockets to ensure the relative position of the two sprockets; the protective shell 06 is installed on the outside of the sprocket support frame 05 to prevent the machine from hurting people.

[0027] (5) Transmission device calibration: After the chain drive tightening torque adapter is assembled, it is sent to a professional torque unit for inspection and calibration to determine the transmission coefficient of the entire transmission device.

[0028] Method of using the device of the present invention:

[0029] (1) Assembly of chain drive tightening torque adapter

[0030] ① Install the driving sprocket 01, the driven sprocket 02 and the chain 03 on the sprocket support frame 05;

[0031] ②Then install the protective shell 06 on the sprocket support frame 05;

[0032] (2) Use of chain drive tightening torque adapter

[0033] The chain drive tightening torque adapter is relatively easy to use. First, install the standard socket wrench 04 on the outer square tenon 051 of the driven sprocket 02; then connect the standard socket wrench 04 to the bolt to be tightened, and lead the driving sprocket 01 to an open space; then insert a conventional torque wrench into the inner square groove 011 of the driving sprocket 01, and operate the torque wrench in the open space to tighten the bolt; finally, tighten the bolt according to the use requirements, and obtain the final bolt tightening torque value by multiplying the torque wrench display value by the transmission coefficient of the adapter.

Claims

1. A chain drive tightening torque conversion device, characterized in that: It includes a driving sprocket, a driven sprocket and a chain that are installed in coordination. The driving sprocket and the driven sprocket are fixed at both ends of a sprocket support frame. One end of the main transmission shaft of the driving sprocket is designed with an inner square groove, and one end of the driven shaft of the driven sprocket is designed with an outer square tenon.

2. A chain drive tightening torque conversion device according to claim 1, characterized in that: A protective shell is installed on the outer side of the sprocket support frame.

3. The chain drive tightening torque conversion device according to claim 1, characterized in that: The main transmission shaft end of the driving sprocket is fixedly connected with a wrench block with an inner square groove, and one end of the driven shaft of the driven sprocket is fixedly connected with an outer square tenon block.

4. The chain drive tightening torque conversion device according to claim 1, characterized in that: The transmission ratio of the driving sprocket and the driven sprocket is 1:

1.

5. The chain drive tightening torque conversion device according to claim 1, characterized in that: The main transmission shaft and the driving sprocket are designed as an integrated whole, and the driven shaft and the driven sprocket are designed as an integrated whole.

6. A chain drive tightening torque conversion device according to claim 1, characterized in that: The inner square groove is connected to a conventional torque wrench and made into a series size 1 / 4 〃 、3 / 8 〃 , 1 / 2 〃 ; External square tenon connected with standard socket wrench, made into series size 1 / 4 〃 、3 / 8 〃 , 1 / 2 〃 .

7. A chain drive tightening torque conversion method, characterized by: The following steps are involved: 1) Install the driving sprocket, driven sprocket and chain on the sprocket support frame; 2) Install the protective shell on the sprocket support frame; 3) First install the standard socket wrench on the outer square tenon of the driven sprocket; then connect the standard socket wrench to the bolt to be tightened, and lead the driving sprocket out to the open space; Then insert a conventional torque wrench into the square groove in the driving sprocket, and operate the torque wrench to tighten the bolt in an open space; finally, determine the force according to the use requirements of the bolt, and multiply the torque wrench display value by the transmission coefficient of the adapter to obtain the final bolt tightening torque value.

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