CN204640024U - A kind of bolt fatigue test clamping device and centering tooling thereof - Google Patents

Abstract

The utility model relates to a bolt fatigue test clamping device and its centering tool. The centering tool of the bolt fatigue test clamping device includes a polished rod section and a corresponding upper rod section whose axis extends along the up and down direction and is used to be inserted into the bolt to be tested when in use. The left arc-shaped positioning piece and the right arc-shaped positioning piece between the hole walls of the screw rod perforation of the fixture, the left and right arc-shaped positioning pieces have an inner peripheral arc surface whose diameter is consistent with the outer diameter of the polished rod section and whose diameter is the same as that of the screw rod. The perforated hole diameter is consistent with the outer peripheral arc surface. The utility model provides a centering tool which can ensure that bolts and bolt perforation holes on an upper fixture are coaxially arranged, and a bolt fatigue test clamping device using the centering tool.

Description

A bolt fatigue test clamping device and its centering tool

technical field

The utility model relates to a clamping device for a bolt fatigue test and a centering tool thereof.

Background technique

With the vigorous development of the aerospace field in recent years, more and more special process bolts are used in the aerospace field, and are mainly used for core components such as engines. Due to the size and test requirements of such special process bolts It is different from ordinary fasteners, which increases the difficulty of the test and causes certain errors in the test results. The existing special bolt is shown in Figure 1: it includes a screw rod whose axis extends in the up and down direction and a head 10 arranged on the upper end of the screw rod. The screw rod includes a polished rod section 11 and a threaded section 12 arranged up and down. The outer diameter of the polished rod section is connected to the testing machine by bolts through the clamping device during the actual test. The clamping device includes an upper clamp and a lower clamp. The lower clamp is provided with a threaded hole that matches the threaded section. The threaded hole is set on the same axis as the screw hole. The polished rod section of the screw is inserted in the screw hole. The head of the screw is located on the upper side of the screw hole. The upper and lower clamps apply dynamic and static tension to the screw in the up and down direction to Fatigue test on bolts, the existing technical problem is: due to technological requirements, the hole diameter of the screw rod must be consistent with the diameter of the threaded section, that is to say, the hole diameter of the screw hole will be larger than the diameter of the polished rod section, which causes the bolt to It may deviate from the axis of the bolt hole, and it cannot be guaranteed that the axial direction of the bolt is in the up and down direction. The loading force of the testing machine on the bolt may have a component force in the horizontal direction, which may easily cause inaccurate test results. In addition, the connection between the head and the polished rod section It belongs to the area where the stress is easy to concentrate. If the upper fixture and the connecting part of the head and the polished rod section are in contact due to the deflection of the screw, it will seriously lead to inaccurate test results.

Utility model content

The purpose of this utility model is to provide a centering tool that can ensure that the bolt and the bolt perforation on the upper fixture are coaxially arranged; the purpose of this utility model is also to provide a bolt fatigue test clamping device using the centering tool .

In order to solve the above problems, the technical solution of the centering tool in the utility model is: the centering tool of the bolt fatigue test clamping device, including the polished rod section and the Corresponding to the left arc-shaped positioning piece and the right arc-shaped positioning piece between the hole walls of the screw rod perforation of the upper fixture, the left and right arc-shaped positioning pieces have an inner peripheral arc surface whose diameter is consistent with the outer diameter of the polished rod section and whose diameter is the same as that of the polished rod section. The outer peripheral arc surface with the same hole diameter as the screw hole.

The lower end of the left arc positioning piece is provided with a left valgus edge, and the lower end of the right arc positioning piece is provided with a right valgus edge.

The left and right valgus rims are symmetrically provided with rim threaded holes parallel to the screw rod perforation.

The technical scheme of the bolt fatigue test clamping device in the utility model is:

The clamping device for the bolt fatigue test includes an upper fixture. The upper fixture is provided with a screw hole extending along the vertical direction for the polished rod section of the corresponding bolt to be tested. The hole diameter of the screw hole is larger than the diameter of the polished rod section. Bolt fatigue The test clamping device also includes a centering tool, and the centering tool includes a left arc-shaped positioning piece and a right arc-shaped positioning piece for inserting between the polished rod section and the hole wall of the screw hole, the axis extending along the up and down direction, The left and right arc-shaped positioning pieces have an inner arc surface whose diameter is consistent with the outer diameter of the polished rod section and an outer arc surface whose diameter is consistent with the hole diameter of the screw hole.

The lower end of the left arc positioning piece is provided with a left valgus edge, and the lower end of the right arc positioning piece is provided with a right valgus edge.

The left and right valgus edges are symmetrically provided with turning edge threaded holes parallel to the screw rod perforation, and the turning edge threaded holes are screwed with force-applying screws for the operator to hold.

The beneficial effects of the utility model are as follows: when in use, the polished rod section of the bolt to be tested is inserted into the screw hole of the upper fixture, and the left and right arc-shaped positioning pieces are inserted into the gap between the polished rod section and the screw hole. The diameter of the inner peripheral arc surface of the left and right arc positioning pieces is consistent with the outer diameter of the polished rod section, and the diameter of the outer peripheral arc surface of the left and right arc positioning pieces is consistent with the inner diameter of the screw hole, so the left and right arc positioning After the piece is inserted between the polished rod section and the screw hole, the polished rod section is set coaxially with the screw hole, and then a certain tension preload is applied to the bolt, and the head of the bolt is fixed on the upper fixture. The arc spacer can carry out the fatigue test on the bolt.

Description of drawings

Fig. 1 is the structural representation of bolt in the utility model background technology;

Fig. 2 is the use status diagram of an embodiment of the bolt fatigue test clamping device in the utility model;

Fig. 3 is a schematic diagram of the structure when the bolt and the centering tool are missing in Fig. 2;

Fig. 4 is a schematic structural view of the right arc-shaped positioning piece in Fig. 2 .

Detailed ways

The embodiment of the clamping device for the bolt fatigue test is shown in Figures 2 to 4: it includes an upper fixture 2 and a lower fixture 6, and the lower fixture is provided with a center for threading with the threaded section 5 of the bolt to be tested. For threaded holes, the upper fixture is provided with a screw through hole 7 coaxially arranged with the central threaded hole, and the diameter of the screw through hole 7 is greater than the diameter of the polished rod section 3 of the bolt to be tested. The clamping device for bolt fatigue test also includes a centering tool, the centering tool includes a left arc-shaped positioning piece 4 and a right arc-shaped positioning piece for inserting between the polished rod section and the hole wall of the screw hole with the axis extending in the up and down direction 14. The left and right arc-shaped positioning pieces are arranged separately. The left and right arc-shaped positioning pieces have an inner circumferential arc surface whose diameter is consistent with the outer diameter of the polished rod section 3 and an outer circumferential arc surface whose diameter is consistent with the diameter of the screw hole 7. The left arc The lower end of the shaped positioning piece is provided with a left valgus edge, and the lower end of the right arc-shaped positioning piece is provided with a right valgus edge. The left and right valgus edges are symmetrically provided with a turn edge threaded hole 8 parallel to the central threaded hole, and a force applying screw rod held by an operator is screwed in the turn edge thread hole. Item 1 in the figure represents the head of the bolt to be tested.

When in use, the screw of the bolt to be tested passes through the screw hole from top to bottom, so that the threaded section of the bolt to be tested is screwed into the central threaded hole of the lower fixture, and the left and right arc-shaped positioning pieces are placed on the left and right of the polished rod section. On both sides, push the left and right arc-shaped positioning pieces from bottom to top into the gap between the polished rod section and the screw hole through the force-applying screw. Due to the positioning effect of the left and right arc-shaped positioning pieces, the polished rod section of the bolt to be tested Set coaxially with the screw hole, and then apply a certain preload to the bolt to be tested, the head of the bolt to be tested is fixed on the upper fixture, and the polished rod section of the bolt to be tested is set coaxially with the bolt hole, the left and right outer On the one hand, turning the edge can facilitate the application of force, on the other hand, it can also prevent the left and right arc-shaped positioning pieces from being inserted into the screw hole through the transition, and then take out the left and right arc-shaped positioning pieces downward through the force-applying screw, and the test can be done Bolt fatigue test, due to the limited operating space, it is inconvenient for the staff to directly apply force to the left and right arc positioning pieces. The force screw can facilitate the staff to apply force and facilitate the installation and removal of the left and right arc positioning pieces.

In other embodiments of the bolt fatigue test clamping device, the left and right valgus edges may not be provided, and at this time, the operator can directly apply force to the left and right arc-shaped positioning pieces.

The embodiment of the centering tool is shown in Figures 2 to 4: the specific structure of the centering tool is the same as the centering tool described in the above-mentioned embodiments of the bolt fatigue test clamping device, and will not be described in detail here.

Claims (6)

1. the centering tooling of bolt fatigue test clamping device, it is characterized in that: the left arc spacer between the hole wall of boring a hole for the screw rod of the polished rod section and corresponding upper fixture that are plugged in bolt to be tested in use comprising that axis extends along the vertical direction and right arc spacer, left and right arc spacer has the consistent periphery cambered surface in aperture that the diameter inner circumferential cambered surface consistent with described polished rod section external diameter and diameter and described screw rod bore a hole.

2. centering tooling according to claim 1, is characterized in that: the lower end of left arc spacer is provided with left outside turning edge, and the lower end of right arc spacer is provided with right outside turning edge.

3. centering tooling according to claim 2, is characterized in that: left and right outer turn edge on be symmetrically arranged with the screwed hole that turns edge be arranged in parallel of boring a hole with screw rod.

4. bolt fatigue test clamping device, comprise fixture, the screw rod perforation that the polished rod section upper fixture being provided with the corresponding bolt to be tested of confession that axis extends along the vertical direction is passed, the aperture of screw rod perforation is greater than the diameter of described polished rod section, it is characterized in that: bolt fatigue test clamping device also comprises centering tooling, centering tooling comprise that axis extends along the vertical direction for being plugged in left arc spacer between hole wall that described polished rod section and screw rod bore a hole and right arc spacer, left, right arc spacer has the consistent periphery cambered surface in aperture that the diameter inner circumferential cambered surface consistent with polished rod section external diameter and diameter and screw rod bore a hole.

5. bolt fatigue test clamping device according to claim 4, it is characterized in that: the lower end of left arc spacer is provided with left outside turning edge, the lower end of right arc spacer is provided with right outside turning edge.

6. bolt fatigue test clamping device according to claim 5, is characterized in that: left and right outer turn edge on be symmetrically arranged with the screwed hole that turns edge be arranged in parallel of bore a hole with screw rod, be installed with the force screw rod that confession operating personnel are hand-held in the screwed hole that turns edge.