CN210775006U - Test bar tensile test clamping device - Google Patents

Abstract

The utility model provides a test rod tension test clamping device, belongs to the check out test set field, test rod tension test clamping device includes the tight head of a pair of relative clamp that sets up, and every presss from both sides tight head and be a pair of horizontal "7" font part, and its periphery is provided with and presss from both sides tight guide cylinder with the anastomotic loudspeaker form of "7" font part, and chuck end-to-end connection has the straining rod, and the straining rod is the lead screw structure, and the lead screw outer end is screw nut, and the screw nut front end presss from both sides tight guide cylinder for loudspeaker form, and the lead screw has hydraulic means to drive rotatoryly, the utility model discloses the degree of freedom of multiplicable anchor clamps avoids the disalignment phenomenon of tensile in-process to appear, and the experimental data that arouse are inaccurate, improves the degree of clamp's of clamp, reduces.

Description

Test bar tensile test clamping device

Technical Field

The utility model relates to a clamping device, in particular to test bar tensile test clamping device belongs to laboratory experimental facilities field.

Background

In casting of a casting, how to test the quality of the casting through a test, when detecting, a manufactured test bar needs to be arranged on a mechanical property testing machine, fig. 3 is a structural schematic diagram of a testing machine clamp in the prior art, clamps 21 are respectively arranged in V-shaped clamping discs 24 which are oppositely arranged, a clamping part of each clamp 21 is provided with a tooth-shaped clamp 21a, the tooth-shaped clamps 21a are connected with the clamps 21 through dovetail grooves, a clamping handle 25 is connected on each clamp 21 through a linkage shaft 27, a tension spring 26 is arranged between each clamping handle 25 and the V-shaped clamping disc 24, a pressing plate 22 is arranged on each clamp 21, a pair of guide rails 23 of the clamps 21 which are mutually matched are arranged below the pressing plate 22 and above each clamp 21, the test bar 20 is clamped at two ends through the clamps 21a through manual clamping handles 25, when the pressing handles 25 are pulled, the clamping heads 21a and the tooth-shaped clamps 21a are connected to move along the rails 23, the test bar 20 is clamped, and then the test bar is pulled to both sides by a hydraulic or pneumatic device connected to the rear of the tightening plate 24.

As mentioned above, the tensile test bar clamping device of the mechanical property testing machine adopts the upper V-shaped tooth-shaped tensile clamp and the lower V-shaped tooth-shaped tensile clamp, the upper part is two, and the lower part is two, when in clamping, the tensile clamp is clamped by utilizing the tension spring manually, the two clamping blocks are folded by utilizing hydraulic pressure or air pressure to clamp the two ends of the test bar in the V-shaped groove, and then the test bar is snapped by engaging the triangular teeth into the head of the test bar. The use of this clamping technique has several disadvantages: 1. when the hardness of the test bar material is high (HRC is more than or equal to 40), the phenomenon of chuck slipping is easy to occur, the test requirements can be met only by carrying out multiple clamping operations, and sometimes the test bar cannot be broken at all because the V-shaped teeth cannot be engaged. 2. The teeth of the V-shaped groove chuck are easy to break, and because the hardness of the teeth is high and the brittleness of the teeth is high, the teeth are broken and abraded after the V-shaped groove chuck is used for a plurality of times, so that the phenomenon of tensile slippage is caused, and the tensile test is influenced. In addition, the test bar with the tensile strength of more than or equal to 1400MPa has high hardness, slips in the test of the original dental-type fixture, and affects the accuracy of detection data, once the test bar slips, the tensile test cannot be carried out, the clamp block can continue to work only by replacing a new clamp block, the purchase cost of the clamp block is generally high, under normal conditions, if the tensile test is carried out every day, the dental-type fixture in the tensile test is seriously worn, the service life of the fixture is short, the fixture is replaced once in 15 days, the replacement is frequent, and the replacement cost is 1600 yuan/set. Generally, more replacement is needed every year, so that high maintenance cost is caused, and the detection cost is high.

Disclosure of Invention

The anchor clamps to present test bar tensile test appear pressing from both sides tight back easily and skid and can appear damaging phenomenons even, the utility model provides a test bar tensile test clamping device, its purpose is the life of extension equipment chuck, improves the degree of clamp's clamp, guarantees the testing result accuracy.

The utility model provides a test rod tension test clamping device, its purpose is the degree of freedom that increases anchor clamps, avoids the disalignment phenomenon among the tensile process to appear, and the experimental data that arouses are inaccurate, improves the tight degree of clamp of anchor clamps, reduces the tight number of times of clamp repeatedly that presss from both sides tight test rod in the experiment, improves experimental speed and the accuracy of experimental data.

The technical scheme of the utility model is that: a test bar tension test clamping device comprises a pair of oppositely arranged clamping heads, each clamping head is a pair of horizontal 7-shaped components, a horn-shaped clamping guide cylinder matched with the 7-shaped components is arranged on the periphery of each clamping head, the tail end of each clamping head is connected with a tension rod, each tension rod is of a lead screw structure, the outer end of each lead screw is provided with a lead screw nut, the front end of each lead screw nut is provided with the horn-shaped clamping guide cylinder, and each lead screw is driven to rotate by a hydraulic device;

furthermore, the front end of the tension rod is of a T-shaped structure, the tail end of the 7-shaped part is provided with a groove which is opposite and matched with the T-shaped structure, and the 7-shaped part is driven to move along the horn-shaped clamping guide cylinder when the tension rod moves back and forth;

furthermore, replaceable toothed clamping blocks are arranged at the opposite positions of the end parts of the pair of horizontal 7-shaped parts;

furthermore, the hydraulic device is a hydraulic rotating device, a reversing valve is connected to the hydraulic device, and an operating switch is arranged on the reversing valve;

further, a safety protection cover is arranged outside the clamping device;

furthermore, the tail end of the 7-shaped component is rotatably connected with the groove matched with the T-shaped structure.

The utility model discloses the positive effect who has is: the clamping head is designed into a pair of horizontal 7-shaped parts, so that the clamping head is favorable for clamping the experimental bar under the driving of the tensioning rod, and particularly, horn-shaped clamping guide cylinders are arranged on the peripheries of the horizontal 7-shaped parts which are oppositely arranged, so that the clamping head is favorable for clamping more and more tightly under the driving of the tensioning rod; the screw rod is arranged on the periphery of the clamping rod, and the screw rod is meshed with the screw rod nut, so that the clamping degree of the test rod can be finely adjusted, and the fracture of a clamping part caused by excessive clamping during clamping can be prevented; because the tail end of the 7-shaped part is rotationally connected with the groove matched with the T-shaped structure, the 7-shaped part can freely rotate when tensioned and has certain degree of freedom, so that data failure caused by different shafts can be avoided; through the degree of freedom that increases anchor clamps, the disalignment phenomenon that can avoid among the tensile process appears, and the experimental data that arouses is inaccurate, and through utilizing this device, life can prolong to 2 years, can save the expense of purchasing 10000 yuan per year of anchor clamps for the pulling force experiment, and the testing result accuracy is high moreover, reduces the tight number of times of the repetition clamp that presss from both sides tight test bar in the experiment, improves experimental speed, can reduce the testing cost.

Drawings

Fig. 1 is a schematic view of a cross-sectional structure of the present invention.

Fig. 2 is an enlarged schematic view of the clamping head.

Fig. 3 is a schematic diagram of a prior art tester clamp structure.

Description of reference numerals: 10-clamping head, 10 a-pressing block 11-guide cylinder, 12-meshing part, 12 a-screw part, 12 b-screw nut part, 13-hydraulic device, 14-operating part, 20-test bar, 21-clamp, 21 a-clamp, 22-guide rail press plate, 23-guide rail, 24-clamping disc, 25-clamping handle, 26-tension spring and 27-linkage shaft.

Detailed Description

The following describes the embodiments of the present invention in detail with reference to the accompanying drawings.

The technical scheme of the utility model is that: a test bar tensile test clamping device, figure 1 is the utility model discloses a section structure sketch map. Fig. 2 is an enlarged schematic view of the clamping head 10. The upper part is a sectional view, the lower part is a base, a hydraulic station and a hydraulic reversing valve are arranged in the base, the test stick tension test clamping device comprises a pair of clamping heads 10 which are oppositely arranged, each clamping head 10 is a pair of horizontal 7-shaped components, a horn-shaped clamping guide cylinder 11 which is matched with the 7-shaped components is arranged on the periphery of each clamping head 10, the tail end of each clamping head 10 is connected with a tensioning rod, each tensioning rod is of a screw rod structure, 12 is an engaging part of a screw rod and a screw nut, the outer side of the screw rod of the engaging part 12 is provided with the screw nut, 12a is a screw rod part, 12b is a screw rod nut part, the front end of the screw nut is provided with the horn-shaped clamping guide cylinder 11, the rear end of the screw rod is connected.

The front end of the tension rod is of a T-shaped structure, the tail end of the 7-shaped part is a groove which is opposite to and matched with the T-shaped structure, and the 7-shaped part is driven to move along the horn-shaped clamping guide cylinder 11 when the tension rod moves back and forth.

The opposite positions of the end parts of the pair of horizontal 7-shaped parts are provided with replaceable toothed clamping blocks 10a, and the toothed clamping blocks 10a are made of high-hardness metal products.

The hydraulic device 13 is a hydraulic rotating device, the hydraulic device 13 is connected with a reversing valve, the reversing valve is provided with an operating switch, and the hydraulic device 14 is an operating part, and the operating switch is arranged on the operating part. The hydraulic device comprises a hydraulic rotating device and a hydraulic station, the hydraulic station and a reversing valve are arranged below the clamping device, a hydraulic pipe of the hydraulic station is connected to the hydraulic rotating device through the reversing valve, and the hydraulic rotating device drives a lead screw to rotate.

The safety protection cover is arranged outside the clamping device, in the embodiment, glass similar to automobile windshield glass is adopted, the middle of the glass is arranged on the metal wire, the glass cannot splash when being broken, and the transparent film is adhered to the surface of the glass.

The utility model designs the clamping head 10 into a pair of horizontal 7-shaped parts, which is beneficial for the clamping head 10 to clamp the experimental bar under the driving of the tension rod, especially, the horn-shaped clamping guide cylinder 11 is arranged at the periphery of the horizontal 7-shaped parts which are oppositely arranged, which is beneficial for clamping more and more tightly under the driving of the tension rod; the lead screw is arranged on the outer side of the clamping rod, the lead screw nut is meshed with the lead screw, the clamping degree of the test rod can be finely adjusted, the fracture of a clamping part caused by excessive clamping during clamping can be prevented, and the 7-shaped component can freely rotate and has certain degree of freedom during tensioning due to the fact that the tail end of the 7-shaped component is rotatably connected with the groove matched with the T-shaped structure, and data failure caused by different shafts can be avoided; through the degree of freedom that increases anchor clamps, the disalignment phenomenon that can avoid among the tensile process appears, and the experimental data that arouses is inaccurate, and through utilizing this device, life can prolong to 2 years, can save the expense of purchasing 10000 yuan per year of anchor clamps for the pulling force experiment, and the testing result accuracy is high moreover, reduces the tight number of times of the repetition clamp that presss from both sides tight test bar in the experiment, improves experimental speed, can reduce the testing cost.

Claims (6)

1. The utility model provides a test rod tensile test clamping device which characterized in that: the test bar tension test clamping device comprises a pair of oppositely arranged clamping heads, each clamping head is a pair of horizontal 7-shaped components, horn-shaped clamping guide cylinders matched with the 7-shaped components are arranged on the peripheries of the clamping heads, the tail ends of the clamping heads are connected with tensioning rods, the tensioning rods are of screw rod structures, the outer ends of screw rods are screw rod nuts, the front ends of the screw rod nuts are horn-shaped clamping guide cylinders, and the screw rods are driven to rotate by a hydraulic device.

2. The test bar tensile test clamping device of claim 1, wherein: the front end of the tensioning rod is of a T-shaped structure, the tail end of the 7-shaped part is provided with a groove which is opposite to the tail end of the 7-shaped part and matched with the T-shaped structure, and the 7-shaped part is driven to move along the horn-shaped clamping guide cylinder when the tensioning rod moves back and forth.

3. The test bar tensile test clamping device of claim 1, wherein: and replaceable toothed clamping blocks are arranged at the opposite positions of the end parts of the horizontal 7-shaped parts.

4. The test bar tensile test clamping device of claim 1, wherein: the hydraulic device is a hydraulic rotating device, a reversing valve is connected to the hydraulic device, and an operating handle is arranged on the reversing valve.

5. The test bar tensile test clamping device of claim 1, wherein: a safety protection cover is arranged outside the clamping device.

6. The test bar tensile test clamping device of claim 2, wherein: the tail end of the 7-shaped part is rotationally connected with the groove matched with the T-shaped structure.

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