Assembly tool and method for unilaterally tightening screw and nut structures

Abstract

The invention provides an assembly tool and method for unilaterally tightening a screw and nut structure. The tool is characterized by comprising a nut tightening rod (1), a screw fixing rod (2), a tightening wrench (3), a screw fixing wrench (4) and a spring (5), a through hole is formed in the nut tightening rod (1), and the screw fixing rod (2) is installed in the through hole of the nut tightening rod (1); the tightening wrench (3) is connected to the nut tightening rod (1); the screw fixing wrench (4) is connected to the screw fixing rod (2) through threads. And the spring (5) is arranged between the tightening wrench (3) and the screw fixing wrench (4). Through the structural design of the internal threads of the screw fixing rod and the nut tightening rod baffle, assembling and tightening of different sizes and different screw and nut structures can be achieved, adaptability improvement on the product structure is not needed, and the device can be used for the assembling environment where the installation position is limited and only unilateral tightening can be allowed.

Description

Technical Field

[0001] The invention relates to the field of solid rocket engine assembly, and in particular to an assembly tool and method for tightening a screw and nut structure on one side. Background Art

[0002] The free-loading engine is a common solid rocket engine structure, which is characterized by the ignition device installed in the middle section of the engine, and the lead of the ignition device is led out through the tail nozzle. When the lead of the ignition device is led out from the nozzle, a low-pass filter and a matching nut are usually used to fix the low-pass filter on the nozzle plug cover. Due to the difficulty of assembly in the narrow space of the nozzle and the requirement of air tightness of the inner cavity, it is necessary to tighten the low-pass filter and the nut from the outside of the nozzle. However, the current one-sided tightening method of the screw nut is mainly achieved through the limit on the other side. The structure is relatively complex, and the passive mass is increased, which cannot meet the high loading ratio requirements of solid rocket engines. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an assembly tool for tightening a screw nut structure on one side, characterized in that it comprises a nut tightening rod 1, a screw fixing rod 2, a tightening wrench 3, a screw fixing wrench 4, and a spring 5, wherein:

[0004] The nut tightening rod 1 is provided with a through hole, and the screw fixing rod 2 is installed in the through hole of the nut tightening rod 1;

[0005] The tightening wrench 3 is connected to the nut tightening rod 1;

[0006] The screw fixing wrench 4 is connected to the screw fixing rod 2 via threads;

[0007] The spring 5 is installed between the tightening wrench 3 and the screw fixing wrench 4 .

[0008] Furthermore, a countersunk threaded hole is provided at one end of the screw fixing rod 2 for connection with the nut tightening rod 1 ; and a thread is provided on the outer surface of the other end for connection with the screw fixing wrench 4 .

[0009] Furthermore, one end of the nut tightening rod 1 is a hexagonal opening, and a through hole matching the outer diameter of the screw fixing rod 2 is provided in the middle for installing the screw fixing rod 2, and the outer surface of the other end is provided with a thread for connecting with the screw fixing wrench 4.

[0010] Furthermore, the tightening wrench 3 is provided with a threaded through hole in the middle and two handles on both sides for applying torque.

[0011] Furthermore, the screw fixing wrench 4 has a threaded through hole in the middle and a knurled texture on the outer surface.

[0012] Furthermore, the hexagonal opening of the nut tightening rod 1 matches and fits with the outer surface of the nut, and the screw fixing rod 2 is tightly fitted with the top of the screw through the spring 5.

[0013] Furthermore, the tightening wrench 3 is connected to the nut tightening rod 1 through threads.

[0014] The present invention also provides an assembly method for tightening a screw-nut structure on one side, which is characterized in that it uses the assembly tool for tightening a screw-nut structure on one side, and comprises the following steps:

[0015] S1, insert one end of the countersunk threaded hole of the screw fixing rod 2 into the through hole of the nut tightening rod 1;

[0016] S2, installing the screw fixing wrench 4 onto the screw fixing rod 2;

[0017] S3, put the spring 5 onto the screw fixing rod 2 and fit it into the screw fixing wrench 4;

[0018] S4, installing the tightening wrench 3 onto the nut tightening rod 1;

[0019] S5. Pre-tighten the screw and nut until the screw thread partially exposes the nut;

[0020] S6, fit the hexagonal opening of the nut tightening rod 1 to the outer surface of the nut and fix it. At this time, the screw fixing rod 2 fits the top of the screw under the action of the spring 5;

[0021] S7, meshing the internal thread of the screw fixing rod 2 with the external thread of the screw according to the tightening direction of the screw;

[0022] S8, rotating the tightening wrench 3 in the tightening direction of the nut drives the nut tightening rod 1 and the nut to rotate in the direction of engagement with the screw;

[0023] S9. When the screw fixing rod 2 is disengaged from the screw, re-tighten the screw and nut one-sidedly step by step according to steps S7 and S8.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are: the function of single-sided tightening of the screw and nut structure can be realized without the need for adaptive improvement of the product structure; the assembly and tightening of screws and nut structures of different sizes can be realized through the internal thread of the screw fixing rod and the baffle structure design of the nut tightening rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of an assembly tool for tightening a screw and nut structure on one side of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the nut tightening rod of the present invention;

[0028] Figure 3 It is a schematic diagram of the screw fixing rod structure of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the tightening wrench of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the screw fixing wrench of the present invention.

[0031] In the figure: 1. Nut tightening rod; 2. Screw fixing rod; 3. Tightening wrench; 4. Screw fixing wrench; 5. Spring.

[0032] Specific implementation methods

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] The assembly tool for tightening the screw and nut structure on one side of the present invention comprises a screw fixing rod 2, a nut tightening rod 1, a tightening wrench 3, a screw fixing wrench 4, and a spring 5. Figure 1 As shown, where:

[0035] The nut tightening rod 1 is provided with a through hole, and the screw fixing rod 2 is installed in the through hole of the nut tightening rod 1. One end of the nut tightening rod 1 is a hexagonal opening, and a through hole matching the outer diameter of the screw fixing rod 2 is provided in the middle, and the outer surface of the other end is provided with a thread for connecting with the screw fixing wrench 4, such as Figure 2 The hexagonal opening of the nut tightening rod 1 matches and fits the outer surface of the nut of the object, and the screw fixing rod 2 is tightly fitted to the top of the screw through the spring 5.

[0036] The screw fixing rod 2 is installed in the through hole of the nut tightening rod 1. One end of the screw fixing rod 2 is provided with a countersunk threaded hole, and the outer surface of the other end is provided with a thread. Figure 3 shown.

[0037] The tightening wrench 3 is connected to the nut tightening rod 1. The tightening wrench 3 is preferably connected to the nut tightening rod 1 by threads. In one embodiment, the tightening wrench 3 is provided with a threaded through hole in the middle and two handles on both sides for applying torque, such as Figure 4 shown.

[0038] The screw fixing wrench 4 is connected to the screw fixing rod 2 by threads. The screw fixing wrench 4 has a threaded through hole in the middle and a knurled texture on the outer surface. Figure 5 shown.

[0039] The spring 5 is installed between the tightening wrench 3 and the screw fixing wrench 4 .

[0040] The assembly method of the present invention for tightening the screw and nut structure on one side using the above-mentioned assembly tool is as follows:

[0041] S1. Insert one end of the countersunk threaded hole of the screw fixing rod 2 into the through hole of the nut tightening rod 1.

[0042] S2. Install the screw fixing wrench 4 onto the screw fixing rod 2.

[0043] S3, put the spring 5 onto the screw fixing rod 2 and fit it with the screw fixing wrench 4.

[0044] S4. Install the tightening wrench 3 onto the nut tightening rod 1.

[0045] S5. Pre-tighten the screw and nut until the thread of the screw partially exposes the nut.

[0046] S6. Fit and fix the hexagonal opening of the nut tightening rod 1 to the outer surface of the nut. At this time, the screw fixing rod 2 fits with the top of the screw under the action of the spring 5.

[0047] S7. Engage the internal thread of the screw fixing rod with the external thread of the screw in the direction of screw tightening.

[0048] S8. Rotate the tightening wrench 3 in the tightening direction of the nut to drive the nut tightening rod 1 and the nut to rotate in the direction of engagement with the screw.

[0049] S9. When the screw fixing rod 2 is disengaged from the screw, the screw and nut need to be tightened one-sidedly step by step according to steps S7 and S8.

[0050] The present invention provides an assembly tool for tightening a screw and nut structure on one side, which can realize assembly and tightening of screw and nut structures of different sizes through the internal thread of the screw fixing rod and the baffle structure design of the nut tightening rod. There is no need to make adaptive improvements to the product structure. It can be used in an assembly environment where the installation position is limited and only one-side tightening is allowed. It is particularly suitable for tightening a low-pass filter and a matching nut from a single side.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalents of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An assembly tool for tightening a screw and nut structure on one side, characterized in that: It comprises a nut tightening rod (1), a screw fixing rod (2), a tightening spanner (3), a screw fixing spanner (4), and a spring (5), wherein: The nut tightening rod (1) is provided with a through hole, and the screw fixing rod (2) is installed in the through hole of the nut tightening rod (1); The tightening wrench (3) is connected to the nut tightening rod (1); The screw fixing wrench (4) is connected to the screw fixing rod (2) via threads; The spring (5) is installed between the tightening wrench (3) and the screw fixing wrench (4).

2. The assembly tool for tightening the screw and nut structure on one side according to claim 1, characterized in that: A countersunk threaded hole is provided at one end of the screw fixing rod (2) for connection with the nut tightening rod (1); and a thread is provided on the outer surface of the other end for connection with the screw fixing wrench (4).

3. The assembly tool for tightening the screw and nut structure on one side according to claim 1, characterized in that: One end of the nut tightening rod (1) is a hexagonal opening, and a through hole matching the outer diameter of the screw fixing rod (2) is arranged in the middle for installing the screw fixing rod (2), and the outer surface of the other end is provided with a thread for connecting with the screw fixing wrench (4).

4. The assembly tool for tightening the screw and nut structure on one side according to claim 1, characterized in that: The tightening wrench (3) is provided with a threaded through hole in the middle and two handles on both sides for applying torque.

5. The assembly tool for tightening the screw and nut structure on one side according to claim 1, characterized in that: The screw fixing wrench (4) has a threaded through hole in the middle and a knurled texture on the outer surface.

6. The assembly tool for tightening the screw and nut structure on one side according to claim 3, characterized in that: The hexagonal opening of the nut tightening rod (1) matches and fits the outer surface of the nut, and the screw fixing rod (2) is tightly fitted to the top of the screw through the spring (5).

7. The assembly tool for tightening the screw and nut structure on one side according to claim 1, characterized in that: The tightening wrench (3) is connected to the nut tightening rod (1) via threads.

8. A method for assembling a screw-nut structure by tightening it on one side, characterized in that: The assembly tool for tightening the screw and nut structure on one side using any one of claims 1 to 7 comprises the following steps: S1. Insert one end of the countersunk threaded hole of the screw fixing rod (2) into the through hole of the nut tightening rod (1); S2. Install the screw fixing wrench (4) onto the screw fixing rod (2); S3, put the spring (5) onto the screw fixing rod (2) and fit it with the screw fixing wrench (4); S4, installing the tightening wrench (3) onto the nut tightening rod (1); S5. Pre-tighten the screw and nut until the screw thread partially exposes the nut; S6. The hexagonal opening of the nut tightening rod (1) is fitted with the outer surface of the nut and fixed. At this time, the screw fixing rod (2) is fitted with the top of the screw under the action of the spring (5); S7, meshing the internal thread of the screw fixing rod (2) with the external thread of the screw in the direction of screw tightening; S8, rotating the tightening wrench (3) in the direction of tightening the nut, driving the nut tightening rod (1) and the nut to rotate in the direction of meshing with the screw; S9. When the screw fixing rod (2) is disengaged from the screw, re-tighten the screw and nut one-sidedly step by step according to steps S7 and S8.

Images