CN215980360U

CN215980360U - Screw rod structure for testing stretcher

Info

Publication number: CN215980360U
Application number: CN202122375894.0U
Authority: CN
Inventors: 张玉成
Original assignee: Hangzhou Leien Intelligent Manufacturing Co ltd
Current assignee: Hangzhou Leien Intelligent Manufacturing Co ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-03-08
Anticipated expiration: 2031-09-29

Abstract

The application discloses a screw structure for testing a stretcher, which comprises a screw thread section connected with the stretcher and a clamping section for clamping and fixing; the surface of the clamping section is provided with a plurality of grooves at intervals, and the grooves are matched and connected with a clamping part with corresponding bulges; a circle of the screw structure close to the clamping section is provided with a polyhedral structure B1 with a regular polygon cross section, and the polyhedral structure B1 is connected with the second fixing piece in a matched manner; the second fixing piece is of a flat structure, and a hollow inner cavity is formed in the center of the second fixing piece; the cross section of the hollow inner cavity is of a regular polygonal polyhedral structure B2 and is adaptive to the polyhedral structure B1; the second fixing piece is sleeved on the periphery of the screw rod structure. The tension device is used for eliminating the influence of a tension effect on a connection mode of threaded connection between the fastener and the test pull rod in the tension process, and the phenomenon of force unbalance loading generated between the fastener and the test pull rod.

Description

Screw rod structure for testing stretcher

Technical Field

The utility model relates to a screw structure for testing a stretcher.

Background

The stretcher is a bolt hydraulic stretcher for short, the stretching force is determined by a hydraulic source provided by a hydraulic booster pump (an ultrahigh pressure hydraulic pump) according to the tensile strength, the yield coefficient and the elongation of a material, the stretched force generated by the ultrahigh pressure hydraulic pump is utilized to stretch a bolt with a force in an elastic deformation area, the diameter of the bolt is slightly deformed, and therefore a nut is easy to loosen.

The stretcher belongs to an ultrahigh pressure product, and should be accurately used, otherwise the expected effect cannot be achieved, and even danger can occur. Therefore, the stretcher needs to be subjected to a tension test before being put into use or after being used for a period of time, and the error between the calibrated tension and the actual tension is ensured to be within an allowable range. When the tension test is performed, a common test pull rod is selected, as disclosed in patent CN201920766665.1, and the test pull rod is connected with the test pull rod through a first fastener and a second fastener at two ends of the test pull rod, so as to be between the first support plate and the second support plate. When the test pull rod is stretched by the stretcher, a gap inevitably occurs between the second fastening piece and the test pull rod, so that a force unbalance loading phenomenon occurs. Whether stability between the lower end of the test pull rod and the fastener in the stretching process is not influenced by the stretching effect through structural improvement of the test pull rod or not is achieved, and therefore the phenomenon of force unbalance loading is avoided to be considered by technical personnel.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an improved screw structure for a test stretcher, which is used for eliminating the phenomenon of force unbalance loading generated between a fastening piece and a test pull rod due to the influence of a stretching effect on the connection mode of threaded connection of the fastening piece and the test pull rod in the stretching process.

The application discloses a screw structure for testing a stretcher, which comprises a screw thread section connected with the stretcher and a clamping section for clamping and fixing; the surface of the clamping section is provided with a plurality of grooves at intervals, and the grooves are matched and connected with a clamping part with corresponding bulges; a circle of the screw structure close to the clamping section is provided with a polyhedral structure B1 with a regular polygon cross section, and the polyhedral structure B1 is connected with the second fixing piece in a matched manner; the second fixing piece is of a flat structure, and a hollow inner cavity is formed in the center of the second fixing piece; the cross section of the hollow inner cavity is of a regular polygonal polyhedral structure B2 and is adaptive to the polyhedral structure B1; the second fixing piece is sleeved on the periphery of the screw structure, and the polyhedral structure B2 is matched with the polyhedral structure B1.

Preferably, the threaded section has a diameter smaller than the diameter of the clamping section.

Preferably, the thread section is connected with the clamping section through a middle section; the connecting part of the thread section and the middle section is an arc transition section A1 with gradually reduced diameter, and the connecting part of the middle section and the clamping section is an arc transition section A2 with gradually increased diameter.

Preferably, the clamping part comprises a left semicircular holding part and a right semicircular holding part, the inner walls of the left holding part and the right holding part are respectively provided with a bulge corresponding to the groove of the clamping section of the screw structure, and the left holding part and the right holding part surround and are clamped with the clamping section of the screw structure.

Preferably, the clamping component is positioned below the second fixing piece and is fixedly connected with the second fixing piece relatively.

Preferably, the height of the hollow inner cavity of the second fixing piece is smaller than that of the second fixing piece, and a frustum-shaped matching cavity is formed below the hollow cavity; the upper surfaces of the left holding piece and the right holding piece are respectively provided with a semi-frustum-shaped step, and the steps of the left holding piece and the right holding piece are combined to form a hollow frustum and are matched with the matching cavity of the second fixing piece.

Preferably, the outer surfaces of the left holding piece and the right holding piece are provided with T-shaped handles convenient for holding.

Has the advantages that: this application is through special screw rod structural design, with the second mounting that has the cavity inner chamber, including the annular left side of semicircle hold the piece and hold the clamping part cooperation of piece with the right side, be used for the tensile test of elongator together. The groove structure of the clamping section of the screw structure is matched with the bulge of the clamping part, so that the screw structure is not easy to displace along the axial direction in the stretching process; the polyhedral structure B1 of the screw structure above the clamping section is designed to be matched with the polyhedral structure B2 inside the second fixing piece, so that the screw structure is not easy to rotate along the radial direction in the stretching process; the second fixing part matching cavity is connected with the hollow frustum of the clamping part in a matching manner, so that the relative fixed connection of the second fixing part and the clamping part is ensured, the overall structure is more stable in the test process, the force unbalance loading phenomenon easily caused by the conventional threaded connection mode is eliminated, and the test result is more accurate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a perspective view of the screw configuration of the present application;

FIG. 2 is a perspective view of a clamping member of the present application;

FIG. 3 is a perspective view of a second fastener of the present application;

in the figure: 11. a threaded segment; 13. a clamping section; 131. a groove; 21. a hollow interior cavity; 22. a mating cavity; 30. a clamping member; 31. a step; 32. t-shaped handles.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

A screw structure for testing a stretcher is matched with a second fixing piece with a hollow inner cavity 21 and a clamping part 30 comprising a left holding piece and a right holding piece in a semicircular ring shape, and is used for testing the tensile force of the stretcher.

As shown in fig. 1, the screw structure includes a threaded section 11 connected to the tensioner and a clamping section 13 for clamping and fixing, and the threaded section 11 and the clamping section 13 are transitionally connected through an intermediate section. The connection part of the thread section 11 and the middle section is an arc transition section A1 with gradually reduced diameter, the connection part of the middle section and the clamping section 13 is an arc transition section A2 with gradually increased diameter, the arc transition is set for eliminating the stress concentration generated in the stretching process, and if the connection parts are made into right-angle connection, the connection parts are easy to break in the stretching process. Considering the easy realization of the thread retracting link in the manufacturing and processing process of the testing screw, the middle section of the testing screw is designed into an inward contraction shape.

Wherein the diameter of the clamping section 13 is larger than the diameter of the threaded section 11. This is to ensure that the clamping segments 13 maintain a better stability during the stretching process. The thicker the root, the better the resistance of the whole big tree to tensile stress when the treetop is subjected to external tension, as compared with a big tree.

The surface of the clamping section 13 is provided with a plurality of grooves 131 at intervals. As shown in fig. 2, the clamping component comprises a left holding part and a right holding part which are semicircular, wherein the inner walls of the left holding part and the right holding part are respectively provided with a bulge corresponding to the groove 131 of the clamping section 13, and the left holding part and the right holding part surround and are clamped with the clamping section 13 of the screw structure. In the stretching process, the screw structure is not easy to displace along the axial direction.

The screw structure is arranged in a polyhedral structure B1 with a regular polygon cross section at the position of one circle above the clamping section 13. As shown in fig. 3, the second fixing member includes a flat structure of the hollow cavity 21, and the cross section of the hollow cavity 21 is a polyhedral structure B2 of a regular polygon. The second fixing piece is sleeved on the periphery of the polyhedral structure B1, and the polyhedral structure B1 is connected with the polyhedral structure B2 in a matched mode and used for keeping stability of the screw structure. In the stretching process, the screw structure is not easy to rotate along the radial direction.

Further, the height of the hollow inner cavity 21 of the second fixing piece is smaller than that of the second fixing piece, and a frustum-shaped matching cavity 22 is formed below the hollow cavity. The left holding piece and the right holding piece of the clamping part 30 are both provided with a semi-frustum-shaped step 31 on the upper surface, and the steps 31 of the left holding piece and the right holding piece are combined to form a hollow frustum and are adapted to the matching cavity 22 of the second fixing piece. During installation, the hollow frustum of the clamping member 30 extends into the matching cavity 22 of the second fixing member, so that the clamping member 30 and the second fixing member are relatively and fixedly connected.

For the convenience of holding, mounting and dismounting, the outer surfaces of the left holding piece and the right holding piece are provided with T-shaped handles 32 convenient for holding.

Before the detection is started, the left holding piece and the right holding piece of the clamping part 30 are connected with the clamping section 13 of the screw structure in a matched mode, the second fixing piece is sleeved on the periphery of the polyhedral structure B1, the polyhedral structure B1 is connected with the polyhedral structure B2 in a matched mode, and meanwhile the hollow frustum of the clamping part 30 just extends into the matching cavity of the second fixing piece.

In the detection process, strain gauges can be arranged around the middle section of the screw rod structure, and the tensile force value output by the stretcher is determined by detecting the deformation of the middle section in the stretching process; the tensile force value output by the stretcher can also be obtained by detecting the reaction force of the tensile force output by the stretcher. No matter which kind of test method, the stability of the relative stretcher of screw rod structure in the testing process can both be guaranteed through the cooperation of screw rod structure and second mounting, hold assembly and be connected for the testing process is safer, and the test result is more accurate.

The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not intended to limit the disclosure to the particular forms disclosed. Similar or identical methods, structures, etc. as used herein, or several technical inferences or substitutions made on the concept of the present application should be considered as the scope of the present application.

Claims

1. The screw structure for testing the stretcher is characterized by comprising a threaded section connected with the stretcher and a clamping section for clamping and fixing;

the surface of the clamping section is provided with a plurality of grooves at intervals, and the grooves are matched and connected with a clamping part with corresponding bulges;

a polyhedral structure B1 with a regular polygon cross section is arranged at one circle close to the upper end of the clamping section, and the polyhedral structure B1 is connected with the second fixing piece in a matching way;

the second fixing piece is of a flat structure, and a hollow inner cavity is formed in the center of the second fixing piece; the cross section of the hollow inner cavity is of a regular polygonal polyhedral structure B2 and is adaptive to the polyhedral structure B1; the second fixing piece is sleeved on the periphery of the screw structure, and the polyhedral structure B2 is matched with the polyhedral structure B1.

2. The screw structure for a test stretcher of claim 1 wherein the threaded section has a diameter smaller than the clamping section diameter.

3. The screw structure for the test stretcher according to claim 1 or 2, characterized in that the screw section and the clamping section are connected through an intermediate section;

the connecting part of the thread section and the middle section is an arc transition section A1 with gradually reduced diameter, and the connecting part of the middle section and the clamping section is an arc transition section A2 with gradually increased diameter.

4. The screw structure for testing the stretcher according to claim 1, wherein the clamping component comprises a left holding part and a right holding part which are semicircular, the inner walls of the left holding part and the right holding part are respectively provided with a bulge corresponding to the groove of the clamping section of the screw structure, and the left holding part and the right holding part surround and are clamped with the clamping section of the screw structure.

5. The screw structure for the test stretcher according to claim 4, wherein the clamping part is located below the second fixing piece and is fixedly connected with the second fixing piece.

6. The screw structure for testing the stretcher according to claim 5, wherein the height of the hollow cavity of the second fixing member is less than that of the second fixing member, and a frustum-shaped matching cavity is formed below the hollow cavity; the upper surfaces of the left holding piece and the right holding piece are respectively provided with a semi-frustum-shaped step, and the steps of the left holding piece and the right holding piece are combined to form a hollow frustum and are matched with the matching cavity of the second fixing piece.

7. The screw structure for the test stretcher of claim 5 wherein the outer surfaces of the left and right holding pieces are provided with T-shaped handles for convenient hand holding.