Fixing device for measuring diameter of broken industrial bar

Abstract

The utility model discloses a fixing device for measuring the diameter of a broken industrial bar, which relates to the technical field of material tensile property testing, and comprises a magnetizing mechanism and a magnetic attraction base of a magnetizer, a cylindrical cavity for the magnetizing mechanism to be installed is arranged in the magnetic attraction base, a dovetail groove is arranged at the top of the magnetic attraction base, and the dovetail groove is arranged in the cylindrical cavity. The magnetizing mechanism comprises a magnetic bar and a variable magnetic core, the magnetic bar is rotationally arranged in the variable magnetic core, the variable magnetic core is provided with a pair of arc-shaped magnetic conductive sheets and a pair of non-magnetic conductive partition plates which are oppositely arranged, and the magnetic bar rotates to enable two poles of the magnetic bar to be in contact with the two arc-shaped magnetic conductive sheets respectively, so that the variable magnetic core is switched to be in a magnetizing state capable of magnetizing the magnetic attraction base; the magnetic bar rotates to enable the two poles of the magnetic bar to be in contact with the same arc-shaped magnetic conductive sheet, so that the variable magnetic core is switched to be in a demagnetization state in which the magnetic attraction base cannot be magnetized, and therefore, the bar can be conveniently taken and placed, and the bar can be conveniently positioned when section matching and diameter measurement are carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of material tensile performance testing, in particular to a fixing device for measuring the post-fracture diameter of industrial rods. Background Art

[0002] The cross-sectional shrinkage rate is one of the performance indicators to measure the plastic deformation capacity of materials, which is used to reflect the ability of materials to withstand plastic deformation before breaking. When a material breaks under tension, the cross section shrinks. The ratio of the area of ​​the reduced cross section to the original area is called the cross-sectional shrinkage rate. The larger the value, the better the plasticity of the material. In actual work, for samples with irregular cross sections, the smallest cross-sectional area of ​​the neck is generally calculated by manually splicing the broken samples and manually measuring the diameters in multiple directions of the neck. For circular industrial materials, there are problems such as unstable sample position after manually splicing the broken samples on a plane, and displacement is prone to occur during measurement.

[0003] In the Chinese standard GB / T228.1-2021 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method", Chapter 21, Determination of Sectional Shrinkage, stipulates that the broken parts of the specimen should be carefully matched together so that their axes are in the same straight line; and it is required that when reading, it should be ensured that the fracture surface is not displaced. In actual work, it is difficult to meet the above requirements without the help of auxiliary devices, the operation requirements are high, and the operation efficiency is low. Utility Model Content

[0004] The utility model aims to provide a fixing device for measuring the post-fracture diameter of industrial bars to solve the above technical problems.

[0005] Based on the above purpose, the utility model provides a fixing device for measuring the post-fracture diameter of industrial bars, comprising a magnetizing mechanism and a magnetic base as a magnetic conductor, wherein a cylindrical cavity for the magnetizing mechanism to be installed is arranged in the magnetic base;

[0006] A dovetail groove is provided on the top of the magnetic base, and the magnetic base uses the dovetail groove to limit the lateral position of the rod and the magnetism imparted by the magnetizing mechanism to keep the position of the rod in the dovetail groove stable;

[0007] The magnetizing mechanism includes a magnetic rod and a variable magnetic core surrounding the magnetic rod. The magnetic rod is rotatably arranged in the variable magnetic core. The variable magnetic core has a pair of arc-shaped magnetic conductive sheets that are magnetic conductive and arranged opposite to each other, and a pair of non-magnetic conductive partitions that are non-magnetic and arranged opposite to each other. The two poles of the magnetic rod are distributed in the radial direction, and the axis of the magnetic rod passes through the interface between the two poles.

[0008] The variable magnetic core switches between a magnetized state and a demagnetized state by means of the rotation of the magnetic bar. In the magnetized state, the two poles of the magnetic bar are in contact with two arc-shaped magnetic conductive sheets respectively, and in the demagnetized state, the two poles of the magnetic bar are in contact with the same arc-shaped magnetic conductive sheet.

[0009] Furthermore, a pair of magnetically conductive pads are placed on the top of the magnetic base, and the shape of the pads is adapted to the dovetail groove. Through the pair of pads arranged at intervals, the breaking points of the two sections of the rod are suspended between the pair of pads.

[0010] Furthermore, the cylindrical cavity passes through one end of the magnetic base, one end of the magnetic rod is connected to a switching knob, and the switching knob protrudes from one end of the magnetic base.

[0011] Furthermore, a chip storage groove is provided on the top of the magnetic base and passes through at least one end thereof, and groove walls on both sides of the dovetail groove are symmetrical with respect to the chip storage groove.

[0012] Furthermore, a pair of slots for inserting the non-magnetic conductive partition plates are provided on the cavity wall of the cylindrical cavity, and the pair of slots are located between a pair of arc-shaped magnetic conductive sheets.

[0013] Furthermore, the non-magnetic conductive partition is made of brass.

[0014] Furthermore, the arc-shaped magnetic conductive sheet is made of soft iron.

[0015] Furthermore, the angle between the groove walls on both sides of the dovetail groove and the angle between the plate surfaces on both sides of the pad are both 150°.

[0016] Beneficial effects of the utility model:

[0017] The utility model uses a dovetail groove on the magnetic base to laterally limit the rod, and uses a magnetizing mechanism on the magnetic base to magnetize the magnetic base, so as to facilitate positioning of the rod when performing cross-section matching and diameter measurement, and the magnetic rod of the magnetizing mechanism can rotate relative to the variable magnetic core to demagnetize the variable magnetic core and the magnetic base, thereby facilitating the taking and placing of the rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or 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 in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the magnetizing mechanism of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the arc-shaped magnetic conductive sheet of the utility model;

[0022] Figure 4 It is a front view of the magnetic base of the utility model.

[0023] The numbers in the figure are:

[0024] 1-magnetizing mechanism; 2-magnetic base; 3-cylindrical cavity; 4-dovetail groove; 5-shield; 6-switching knob; 7-chip storage groove; 8-slot;

[0025] 101-magnetic rod; 102-arc-shaped magnetic conductive sheet; 103-non-magnetic conductive partition. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0027] like Figures 1 to 4 As shown, a fixing device for measuring the post-fracture diameter of an industrial bar comprises a magnetizing mechanism 1 and a magnetic base 2 which is a magnetic conductor, wherein a cylindrical cavity 3 for the magnetizing mechanism 1 to be installed is arranged in the magnetic base 2;

[0028] A "V"-shaped dovetail groove 4 is provided on the top of the magnetic base 2. The magnetic base 2 uses the lateral position limiting of the rod by the dovetail groove 4 and the magnetism imparted by the magnetizing mechanism 1 to keep the position of the rod in the dovetail groove 4 stable.

[0029] The magnetizing mechanism 1 includes a magnetic rod 101 and a variable magnetic core surrounding the magnetic rod 101. The magnetic rod 101 is rotatably arranged in the variable magnetic core. The variable magnetic core has a pair of arc-shaped magnetic conductive sheets 102 which are magnetic conductive bodies and are arranged opposite to each other, and a pair of non-magnetic conductive partitions 103 which are non-magnetic conductive bodies and are arranged opposite to each other. The two poles of the magnetic rod 101 are distributed in the radial direction, and the axis of the magnetic rod 101 passes through the interface between the two poles.

[0030] The variable magnetic core switches between a magnetized state and a demagnetized state by means of the rotation of the magnetic rod 101. In the magnetized state, the two poles of the magnetic rod 101 contact two arc-shaped magnetic conductive sheets 102 respectively, and in the demagnetized state, the two poles of the magnetic rod 101 contact the same arc-shaped magnetic conductive sheet 102.

[0031] The two broken sections of the rod are placed in the dovetail groove 4 on the top of the magnetic base 2. Since the inner sides of the two side walls of the dovetail groove 4 are close to each other and tilted downward, the rod will be hindered from moving in both directions, and it has the function of automatically centering the rod, so that the two sections of the rod can automatically roll to the lowest point of the dovetail groove 4, so as to facilitate the positioning of the rod in the process of adjusting the orientation of the rod and matching the cross sections of the two rods. After the cross sections of the two rods are matched and docked, the magnetizing mechanism 1 switches to the magnetizing state, so that the magnetic base 2 has magnetism, so that the magnetic base 2 adsorbs the two rods on the top to increase the friction between the rod and the magnetic base 2, which helps to prevent the movement of the rod when measuring the diameter near the cross section of the rod, resulting in the need to match the cross sections of the two sections of the rod again.

[0032] In addition, the magnetizing mechanism 1 adopts the principle of a magnetic seat (also known as a magnetic table seat, a magnetic table seat), that is, when the magnetic rod 101 rotates to a position where the two poles are in contact with two arc-shaped magnetic conductive sheets 102 respectively, the magnetic force of the magnetic rod 101 is transmitted to the magnetic base 2 through the arc-shaped magnetic conductive sheets 102, and when the magnetic rod 101 rotates to a position where the two poles are in contact with the same arc-shaped magnetic conductive sheet 102, due to the mutual cancellation of the magnetic forces on the arc-shaped magnetic conductive sheet 102, at this time, the arc-shaped magnetic conductive sheet 102 becomes non-magnetic.

[0033] The magnetizing mechanism 1 is designed to be demagnetizable because it is convenient to clean the iron filings on the magnetic base 2 and to smoothly take and place the rod. The magnetizing mechanism 1 is designed to be mechanically magnetizable and demagnetizable, which can save energy on the one hand and eliminate the safety hazard of electric shock on the other.

[0034] A pair of magnetically conductive pads 5 are placed on the top of the magnetic base 2. The pads 5 are adapted to the dovetail groove 4 in a "V" shape, that is, the top and bottom of the pads 5 are both in a "V" shape, so that the pads 5 fit the dovetail groove 4, and the pads 5 replace the dovetail groove 4 to complete the positioning of the rod. The pair of pads 5 arranged at intervals can make the breaking points of the two sections of the rod suspended between the pair of pads 5, so as to facilitate the diameter detection, cross-section alignment and other operations on the broken part of the rod.

[0035] Furthermore, the pad 5 can slide back and forth along the dovetail groove 4 to adjust the spacing between a pair of pads 5, that is, to adjust the position of the rod relative to the pad 5, so that after the two sections of rod are spliced, the rods of different lengths supported by the pad 5 can maintain balance.

[0036] Among them, the cylindrical cavity 3 passes through one end of the magnetic base 2, and one end of the magnetic rod 101 is connected to a switching knob 6, which protrudes from one end of the magnetic base 2. The setting of the switching knob 6 facilitates the manual and external driving equipment to rotate the magnetic rod 101.

[0037] In addition, the top of the magnetic base 2 is provided with a chip groove 7 which runs through at least one end thereof, and the groove walls on both sides of the dovetail groove 4 are symmetrical with respect to the chip groove 7. The function of the chip groove 7 is to collect the debris falling from the cross section of the rod during measurement by means of the inclined design of the groove walls on both sides of the dovetail groove 4, so as to avoid affecting the smooth sliding of the pad 5 in the dovetail groove 4, reduce the frequency of cleaning the debris, and facilitate centralized processing of the debris.

[0038] Preferably, the non-magnetic partition 103 is made of brass with low magnetic permeability, while the arc-shaped magnetic conductive sheet 102 is made of soft iron with high magnetic permeability. Soft iron is not only easily magnetized but also can be demagnetized immediately.

[0039] The angle between the groove walls on both sides of the dovetail groove 4 and the angle between the plate surfaces on both sides of the pad 5 are both 150°. If the angle is too small, the vertical distance between the rod and the magnetic bar 101 below will increase, resulting in a decrease in the adsorption force on the rod. If the angle is too large, the effectiveness of the pad 5 and the dovetail groove 4 in lateral limiting the rod will be reduced.

[0040] In addition, to facilitate the installation and positioning of the variable magnetic core, a pair of slots 8 for the non-magnetic conductive partition 103 to be inserted are provided on the cavity wall of the cylindrical cavity 3 , and the pair of slots 8 are located between the pair of arc-shaped magnetic conductive sheets 102 .

[0041] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A fixture for measuring the post-fracture diameter of industrial bars, characterized in that: It comprises a magnetizing mechanism (1) and a magnetic base (2) which is a magnetic conductor, wherein a cylindrical cavity (3) is provided in the magnetic base (2) for the magnetizing mechanism (1) to be installed; A dovetail groove (4) is provided on the top of the magnetic base (2), and the magnetic base (2) uses the dovetail groove (4) to limit the lateral position of the rod, and the magnetism imparted by the magnetizing mechanism (1) to maintain the position of the rod in the dovetail groove (4) stable. The magnetizing mechanism (1) comprises a magnetic rod (101) and a variable magnetic core surrounding the magnetic rod (101); the magnetic rod (101) is rotatably arranged in the variable magnetic core; the variable magnetic core comprises a pair of arc-shaped magnetic conductive sheets (102) which are magnetic conductive materials and arranged opposite to each other, and a pair of non-magnetic conductive partitions (103) which are non-magnetic conductive materials and arranged opposite to each other; the two poles of the magnetic rod (101) are distributed in the radial direction thereof, and the axis of the magnetic rod (101) passes through the interface between the two poles; The variable magnetic core switches between a magnetized state and a demagnetized state by means of the rotation of the magnetic bar (101); the two poles of the magnetic bar (101) in the magnetized state are in contact with two arc-shaped magnetic conductive sheets (102) respectively, and the two poles of the magnetic bar (101) in the demagnetized state are in contact with the same arc-shaped magnetic conductive sheet (102).

2. A fixture for measuring the post-fracture diameter of industrial bars according to claim 1, characterized in that: A pair of magnetically conductive pads (5) are placed on the top of the magnetic base (2); the shape of the pads (5) is adapted to the dovetail groove (4); and the breaking points of the two sections of the rod are suspended between the pair of pads (5) by means of the pair of pads (5) arranged at intervals.

3. A fixture for measuring the post-fracture diameter of industrial bars according to claim 1, characterized in that: The cylindrical cavity (3) passes through one end of the magnetic base (2); one end of the magnetic rod (101) is connected to a switching knob (6); and the switching knob (6) protrudes from one end of the magnetic base (2).

4. A fixture for measuring the post-fracture diameter of industrial bars according to claim 1, characterized in that: The top of the magnetic base (2) is provided with a chip accumulation groove (7) that passes through at least one end thereof, and the groove walls on both sides of the dovetail groove (4) are symmetrical with respect to the chip accumulation groove (7).

5. A fixture for measuring the post-fracture diameter of industrial bars according to claim 1, characterized in that: A pair of slots (8) for inserting the non-magnetic conductive partition plate (103) are provided on the cavity wall of the cylindrical cavity (3), and the pair of slots (8) are located between a pair of arc-shaped magnetic conductive sheets (102).

6. A fixture for measuring the post-fracture diameter of industrial bars according to claim 1, characterized in that: The non-magnetic conductive partition (103) is made of brass.

7. A fixture for measuring the post-fracture diameter of industrial bars according to claim 1, characterized in that: The arc-shaped magnetic conductive sheet (102) is made of soft iron.

8. A fixture for measuring the post-fracture diameter of industrial bars according to claim 2, characterized in that: The angle between the groove walls on both sides of the dovetail groove (4) and the angle between the plate surfaces on both sides of the pad (5) are both 150°.

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