CN204575414U - A kind of dumbbell specimen preparation device for cable tension test - Google Patents

Abstract

The utility model discloses a dumbbell test piece preparation facilities is used in cable tension test belongs to cable tension test field, and it has solved current cable dumbbell test piece manufacturing installation and has had the structure complicacy, and manufacturing cost is high, maintains the difficulty, the relatively poor problem of stability. The utility model comprises a workbench and a frame, wherein the frame is of a stand column structure, the workbench is fixed at the lower end of the frame and comprises a lead screw guide seat, a stamping lead screw and a screw seat; the screw rod guide seat is fixed at the middle end of the machine base; the nut seat is fixed at the upper end of the machine base; the lead screw guide seat is provided with a guide rail groove in the vertical direction; the stamping screw rod corresponds to the nut seat; one end of the stamping screw rod is provided with a turntable, and the other end of the stamping screw rod is provided with a guide rail block which is clamped with the guide rail groove; the lower end of the guide rail block is provided with a dumbbell die. The utility model discloses its simple structure, convenient operation can make cable dumbbell test piece fast, has economic, high-efficient, practical effect.

Description

A kind of dumbbell specimen preparation device for cable tension test

technical field

The utility model belongs to the field of cable tension testing, in particular to a dumbbell test piece preparation device for cable tension testing.

Background technique

Testing the mechanical properties of cable insulation and sheath materials is an essential means for developing and developing new materials, improving material quality, maximizing material potential, analyzing cable faults, ensuring reasonable design of parts, and safe and reliable use and maintenance. . The basic task of testing the mechanical properties of cable insulation and sheath materials is to correctly select testing instruments, equipment and samples, determine reasonable mechanical performance criteria, and measure such criteria accurately and as quickly as possible. Test equipment, sample shape, size and processing method, loading rate, temperature, medium, etc. all affect the mechanical performance test results of cable insulation and sheath materials. Only by adopting the same test method standards and test procedures can the reliability and comparability of the mechanical performance test results of cable insulation and sheath materials be guaranteed. The correct selection and implementation of standards is the primary condition to ensure the quality of mechanical performance testing of cable insulation and sheath materials. Cable mechanical performance testing, one of the important testing items is cable pull test. The cable sample needs to be prepared before the cable tensile test, and the cable tensile test sample is generally made into a dumbbell test piece or a tubular test piece. The traditional dumbbell test piece preparation method is: 1, insulation test piece: cut axially, extract the conductor. Strips cut to length are ground or shaved flat so that there are parallel surfaces between the marked lines. According to the provisions of 9.1.3 in the GB/T2951.11-2008 specification, make a large dumbbell test piece or a small dumbbell test piece. Before the tensile test, mark two marking lines in the center of each dumbbell specimen. The distance between them: 20mm for the big dumbbell test piece; 10mm for the small dumbbell test piece. Incomplete ends of the dumbbell specimen are permitted as long as the breaking point occurs between the marked lines. 2. Sheath test piece: Cut the sheath along the axial direction of the cable, cut a narrow strip, and remove all the cable components in the narrow strip. If there are ridges or depressions in the narrow strip, they should be ground or shaved flat. For PE and PP sheaths can only be flattened. Then prepare the test piece according to the insulation test piece preparation method. The efficiency of preparing dumbbell specimens by this method is relatively slow, and the error is relatively large, and the prepared dumbbell specimens are often not standard enough.

Chinese patent application number 201320095438.3, the patent document published on October 23, 2013, discloses a preparation device for dumbbell test pieces of cable insulation and sheath materials. The cutting device is used to prepare dumbbell test pieces for measuring the mechanical properties of cable insulation and sheath materials, so as to save labor, improve efficiency, and realize the purpose of automatic preparation of dumbbell test pieces for cable insulation and sheath materials. The preparation device for the cable insulation and sheath material dumbbell test piece includes the driving device installed under the support and the rolling device above the support, cutting device, direction adjustment device and material conveying device; in the process of preparing the dumbbell test piece, the cable insulation And the sheath material is conveyed by the conveyor belt between the rolling rollers and between the rolling rollers and the self-adjusting baffle for several times of rolling, and finally the assembly blade cuts according to the standard pattern engraved on the rolling rollers to complete Sampling of cable insulation and sheath material is made into a dumbbell test piece, which is output from the discharge port. However, the utility model has a complex structure, high manufacturing cost, relatively high requirements on its operating performance, and is prone to operating deviation. Once an operating failure occurs, the manufacturing error of the dumbbell test piece will increase, affecting the normal test of the mechanical properties of the cable.

Chinese Patent Application No. 201420487041.3, a patent document published on December 24, 2014, discloses a dumbbell plate manufacturing device for wires and cables, which is characterized in that it consists of a base, a straight plate extending upward on one side of the base, and located at the other end of the straight plate And it is composed of a flat plate directly above the base and parallel to the base, a stamping positioning part fixed on the straight plate, a pressure bearing part, a rotating part, a shaft positioning part, a moving rod, an elastic part, a rotating wheel, and a dumbbell plate making mold. The utility model structural cable has the following main beneficial effects: the structure is ingenious, the shape of the produced dumbbell plates is consistent, the production is more convenient, simple and safe; the labor intensity is lower and the work efficiency is higher. However, the structure of this utility model is still comparatively complicated, and the elastic member is used to support the shaft positioning member, so the stability is poor.

Contents of the invention

1. Problems to be solved

Aiming at the problems of complex structure, high manufacturing cost, difficult maintenance and poor stability in the existing cable dumbbell test piece manufacturing device, the utility model provides a dumbbell test piece preparation device for cable tension test, which has a simple structure and is easy to operate. The cable dumbbell test piece can be quickly produced, and has economical, efficient and practical effects.

2. Technical solution

In order to solve the above problems, the utility model adopts the following technical solutions.

A device for preparing dumbbell specimens for cable tension testing, comprising a workbench and a machine base, the said machine base is a column structure, the said workbench is fixed at the lower end of the machine base, and also includes a screw guide seat, a punching screw and the screw nut seat; the screw guide seat is fixed at the middle end of the machine base; the screw nut seat is fixed at the upper end of the machine base; the screw guide seat is provided with a vertical rail groove; The screw nut seat is provided with a threaded hole; the stamping screw rod is a threaded rod, and the external thread of the threaded rod corresponds to the internal thread of the threaded hole on the screw nut seat; one end of the punching screw rod is provided with a turntable, and the other One end passes through the threaded hole of the screw nut seat and then extends into the guide rail groove, and one end of the stamping screw rod extending into the guide rail groove is provided with a guide rail block, and the guide rail block is matched with the guide rail groove; the lower end of the guide rail block is provided with a dumbbell mold .

Preferably, the inner wall of the guide rail groove is provided with a first guide rail pad, the first guide rail pad is fixed on the inner wall of the guide rail groove by bolts; ; The surface roughness of the contact surface of the first rail pad and the second rail pad is 0.2.

Preferably, the dumbbell mold is a dumbbell punch.

Preferably, a dumbbell mold base is provided between the workbench and the dumbbell mold; the dumbbell mold base is made of nylon fiber material.

Preferably, the dumbbell mold is fixed on the lower end of the guide rail block by bolts.

Preferably, an oil injection hole is provided on the guide rail block, and an oil groove is provided on the second guide rail cushion block.

Preferably, a T-shaped slot is also provided on the workbench.

3. Beneficial effects

Compared with the prior art, the beneficial effects of the utility model are:

(1) The utility model adopts the integrated structure of fixed workbench, screw guide seat and screw nut seat on the machine base, which has a simple and stable structure; the stamping screw rod passes through the screw nut seat and then slides and guides through the screw guide seat, with high precision , good stability; the dumbbell mold is directly set at the lower end of the punching screw, the structure is simple, easy to assemble and manufacture, and the cost is low; the utility model has a simple overall structure and is easy to operate, and can quickly produce cable dumbbell test pieces with the corresponding dumbbell mold base. parts, with economical, efficient and practical effects;

(2) The utility model guide rail groove inner wall is provided with the first guide rail cushion block, and the first guide rail cushion block is fixed on the guide rail groove inner wall by bolts, and the guide rail block and the guide rail groove engaging place are provided with the second guide rail cushion block, can Reduce the friction coefficient between the guide rail block and the guide rail groove, improve the sliding performance, thereby improving the processing efficiency and processing accuracy of the utility model; and the first guide rail pad and the second guide rail pad can be replaced to prolong the service life of the equipment; The surface roughness of the contact surface between the guide rail pad and the second guide rail pad is 0.2, which on the one hand makes the relative sliding smoother, on the other hand increases the friction resistance and prolongs the service life;

(3) The dumbbell mold of the present utility model is a dumbbell punch, which can directly manufacture qualified dumbbell test pieces in conjunction with the dumbbell mold base, and the punch is easy to manufacture and has low manufacturing cost; the dumbbell mold base is made of nylon fiber material, so that the stamping process has a certain The cushioning effect avoids damage to the equipment; the dumbbell mold can be disassembled to replace dumbbell molds of different sizes, so as to process dumbbell specimens of different specifications;

(4) The guide rail block of the utility model is provided with an oil injection hole, and the second guide rail pad is provided with an oil groove, which can ensure that the sliding part is in a lubricated state, prolongs the service life, and improves the action performance; a T-shaped groove is provided on the workbench, which can It is used for clamping other types of molds, so that the utility model can be used for stamping processing of other small test pieces.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is the side view of Fig. 1;

FIG. 3 is a top view of FIG. 1 .

In the figure: 1. Workbench; 2. Dumbbell mold holder; 3. Screw guide seat; 4. Stamping screw rod; 5. Screw nut seat; 6. Turntable; 7. Dumbbell mold;

Detailed ways

The utility model is further described below in conjunction with specific embodiments.

Example 1

As shown in Fig. 1, Fig. 2 and Fig. 3, a kind of dumbbell specimen preparation device for cable tension test comprises a workbench 1 and a machine base 8, the machine base 8 is a column structure, and the workbench 1 is fixed on the lower end of the machine base 8 , the table 1 is provided with a T-shaped groove; it also includes a screw guide seat 3, a stamping screw 4 and a screw nut seat 5; the screw guide seat 3 is fixed on the middle end of the machine base 8; the screw nut seat 5 is fixed on the machine The upper end of the seat 8; the screw guide seat 3 is provided with a vertical guide rail groove, the inner wall of the guide rail groove is provided with a first guide rail pad, and the first guide rail pad is fixed on the guide rail groove inner wall by bolts; the screw female seat 5 There is a threaded hole; the stamping screw 4 is a threaded rod, and the external thread of the threaded rod corresponds to the internal thread of the threaded hole on the screw nut seat 5; one end of the stamping screw 4 is provided with a turntable 6, and the other end passes through the nut The threaded hole of the seat 5 stretches into the guide rail groove behind, and the end of the stamping screw mandrel 4 stretching into the guide rail groove is provided with a guide rail block, and the guide rail block matches the guide rail groove, and a second guide rail spacer is provided at the matching place of the guide rail block and the guide rail groove. The surface roughness of the contact surface between the first guide rail pad and the second guide rail pad is 0.2, and the hardness is 56HRC. There is an oil injection hole on the guide rail block, and an oil groove on the second guide rail pad; the lower end of the guide rail block is equipped with a dumbbell mold. 7. The dumbbell mold 7 is a dumbbell punch, and the dumbbell mold 7 is fixed on the lower end of the guide rail block by bolts; a dumbbell mold base 2 is arranged between the workbench 1 and the dumbbell mold 7; the dumbbell mold base 2 is made of nylon fiber material.

The concrete working process of the present utility model is: the dumbbell mold base 2 that material is nylon fiber is fixed on the workbench 1, the cable insulation skin to be tested is placed on the dumbbell mold base 2, and the rotating disk 6 is manually rotated, and the stamping screw mandrel 4 begins to The screw nut seat 5 rotates inside and pushes the guide rail block to slide in the guide rail groove. Due to the self-weight effect of the turntable 6, the stamping screw 4 and the guide rail block, the dumbbell mold quickly approaches the dumbbell mold seat 2, and the cable insulation to be tested is under the action of inertia. A huge impact is generated, so that the insulation of the cable to be tested forms a dumbbell test piece, and the dumbbell test piece is completed. The utility model has the advantages of fast and convenient manufacturing of the dumbbell test piece, high precision, high efficiency, simple structure and higher practicability compared with the prior art.

Claims (7)

1. a kind of dumbbell specimen preparation device for cable tension test, comprises workbench (1) and support (8), and described support (8) is column structure, and described workbench (1) is fixed on machine The lower end of the seat (8) is characterized in that: it also includes a screw guide seat (3), a stamping screw (4) and a screw nut seat (5); the screw guide seat (3) is fixed on the base ( 8) at the middle end; the said nut seat (5) is fixed on the upper end of the machine base (8); the said screw guide seat (3) is provided with a guide rail groove in the vertical direction; said nut The seat (5) is provided with a threaded hole; the stamping screw (4) is a threaded rod, and the external thread of the threaded rod corresponds to the internal thread of the threaded hole on the nut seat (5); the stamping screw (4) One end is provided with a turntable (6), and the other end passes through the threaded hole of the nut seat (5) and extends into the guide rail groove, and the end of the stamping screw (4) extending into the guide rail groove is provided with a guide rail block, and the guide rail block Cooperate with the guide rail groove; the lower end of the guide rail block is provided with a dumbbell mold (7). 2. A kind of dumbbell specimen preparation device for cable tension test according to claim 1, characterized in that: the inner wall of the guide rail groove is provided with a first guide rail pad, and the first guide rail pad is fixed on the guide rail by bolts On the inner wall of the groove; the position where the guide rail block matches the guide rail groove is provided with a second guide rail pad; the surface roughness of the contact surface of the first guide rail pad and the second guide rail pad is 0.2. 3. The device for preparing a dumbbell test piece for cable tension testing according to claim 1, characterized in that: the dumbbell mold (7) is a dumbbell punch. 4. a kind of dumbbell test piece preparation device for cable tension test according to claim 3 is characterized in that: a dumbbell mold base (2) is provided between the workbench (1) and the dumbbell mold (7); The dumbbell mold base (2) is a nylon fiber material. 5. A device for preparing a dumbbell test piece for cable tension testing according to any one of claims 2, characterized in that: the dumbbell mold (7) is fixed to the lower end of the guide rail block by bolts. 6 . The device for preparing a dumbbell test piece for cable tension testing according to claim 5 , wherein an oil injection hole is provided on the guide rail block, and an oil groove is provided on the second guide rail pad. 7 . 7. A device for preparing a dumbbell test piece for cable tension testing according to claim 6, characterized in that: said workbench (1) is also provided with a T-shaped groove.