CN106441848B - Dead head hammer removing test device - Google Patents
Dead head hammer removing test device Download PDFInfo
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- CN106441848B CN106441848B CN201610889185.5A CN201610889185A CN106441848B CN 106441848 B CN106441848 B CN 106441848B CN 201610889185 A CN201610889185 A CN 201610889185A CN 106441848 B CN106441848 B CN 106441848B
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- dead head
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/34—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by mechanical means, e.g. hammer blows
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A dead head hammer removing test device comprises a base, wherein the base is formed by welding a plurality of cross beams and longitudinal beams together and is characterized in that two sample sleeves are welded on the cross beams of the base; the upper plane of the sample sleeve is flush with the upper plane of the base, an adjusting sleeve is placed in one of the sample sleeves, the outer diameter of the adjusting sleeve is consistent with the inner diameter of the sample sleeve, the inner diameter of the adjusting sleeve is consistent with the diameter of a damaged sample, and pin holes are formed in the sample sleeve and the adjusting sleeve.
Description
Technical Field
The application belongs to the field of casting machinery and relates to a test device of riser removing equipment in a casting post-treatment process.
Background
In the casting production process in the casting industry, particularly the production of large castings, the removal of a casting head is always difficult. The traditional adoption gas cutting, artifical with the sledge hammer hammering, or adopt the driving crane to hoist metal pouring weight striking rising head, can bring the power consumption like this, the foundry goods quality damages, inefficiency and unsafe scheduling problem. To solve this problem, a feeder head removing hammer is now used to remove the feeder head. The protecting cylinder of the dead head removing hammer is aligned with the dead head, and the piston rod can be punched out of the protecting cylinder by pressing the button valve, so that the dead head can be broken by enough energy. Before the feeder hammer is sold, the impact energy, the diameter of the feeder which can be broken and is made of different materials and the service life are parameters which must be known. Before the test device is invented, in order to test the size of the riser diameter of the casting which can be broken by the feeder removing hammer, a proper casting manufacturer is searched for testing. Although the method can truly reflect the working capacity of the dead head removing hammer, the method is limited by the type and the size of the casting, and meanwhile, casting manufacturers have various concerns and worries.
The impact energy is an important technical parameter of the dead head hammer removing equipment, and directly influences the size of the diameter of a broken dead head. In the air hammer technique conditions (GB/T25721-2010), the impact energy was measured using an upset lead column, and the method is shown in FIG. 2. Actual impact energy E1Calculated according to equation (1).
E1=K*d0 3[2.7a+4(a2+a4)]……………………………………………………(1)
In the formula: e1-impact work in joules (J); d0-the diameter of the lead post before impact in millimeters (mm); h is0-the height of the lead post before striking in millimeters (mm); h is1-the height of the lead post after one strike in millimeters (mm); a = (h)0-h1)/h0；K=0.01 J/mm3。
The method for measuring the striking energy of the air hammer only needs to vertically place a lead column on a horizontal plane, vertically strike the sample from top to bottom by the air hammer, and only horizontally strike the sample by the dead head hammer.
In order to horizontally place a lead column sample, the sample must be horizontally fixed on a vertical plate perpendicular to the ground. Before fixed an internal diameter size and lead post sample diameter unanimous on the riser, highly be the drum of lead post sample diameter third, directly place lead post sample in the drum, solved the problem that lead post sample level was placed like this, but hit after beating lead post sample, lead post bottom diameter can the grow, and the expansion of lead post bottom can be restricted in the existence of drum, and then causes the authenticity of once beating the height of back lead post.
The impact energy has a certain relation with the sectional area of the sample: a isk=Ak/F（2）
akImpact toughness of a material in joules per square centimeter (J/cm)2）；
Ak-impact work in joules (J);
f-the cross-sectional area of the notch of the sample, in square centimeters (cm)2）
The impact toughness value of each material is constant, so that the diameter of the dead head which can be broken theoretically can be calculated according to the impact power value measured by tests.
Disclosure of Invention
The application provides a dead head hammer removing test device which can test the impact power of a dead head hammer removing method according to an upsetting lead column method; meanwhile, the diameters of samples made of different materials which can be broken can be visually displayed through a destructive test; the test device can also carry out fatigue test to test the damage degree of the striking frequency to the dead head hammer removing equipment.
The technical scheme adopted by the scheme for solving the problems is as follows: a dead head hammer removing test device comprises a base, wherein the base is formed by welding a plurality of cross beams and longitudinal beams together and is characterized in that two sample sleeves are welded on the cross beams of the base; the upper plane of the sample sleeve is flush with the upper plane of the base, an adjusting sleeve is placed in one of the sample sleeves, the outer diameter of the adjusting sleeve is consistent with the inner diameter of the sample sleeve, the inner diameter of the adjusting sleeve is consistent with the diameter of a damaged sample, pin holes are formed in the sample sleeve and the adjusting sleeve, and the inserted pin shaft can support the sample placed in the sample sleeve.
The concrete characteristics of this scheme are also, two sample sleeve intermediate positions are provided with the riser on the base, riser bottom and crossbeam welding, the back is provided with two riser gussets and welds with riser and crossbeam respectively, the shock resistance of reinforcing riser, has the unthreaded hole that supplies the bolt to pass on the riser, a bolt passes in the threaded hole that unthreaded hole screw in lead post sample bottom central point was equipped with and fixes lead post sample on the riser, with the size of the lead post method test percussion power of jumping-up.
There is the apron base upper end, is provided with the hole on the apron in order to avoid two sample sleeves, riser and riser gusset, is provided with the square hole on the apron of the sample sleeve left and right sides, makes things convenient for operating personnel to insert and extract the round pin axle, and the base is equipped with the sample connection and can takes out the destruction sample in the adjustment sleeve.
The periphery of the base is provided with the safety shield, so that the damage to the surrounding environment caused by the flying-out of the sample in the destructive test can be prevented.
The base is internally provided with a plurality of rib plates, the rib plates are welded with the longitudinal beam, the supporting plate is arranged below the longitudinal beam, cement is injected into a space enclosed by the longitudinal beam, the rib plates and the supporting plate, so that the cement can resist the impact of a dead head removing hammer on the base without generating displacement, and the accuracy of impact energy is influenced by relative displacement.
The beneficial effect of this scheme is: placing a fatigue sample with the diameter consistent with the inner diameter of the sample sleeve in the fatigue sample sleeve for fatigue test, and testing the damage degree of the striking frequency to the dead head hammer removing equipment; placing a damage sample in a damage sample sleeve, selecting a proper adjusting sleeve according to the diameter of the required damage sample, inserting the damage sample into the adjusting sleeve for a damage test, and testing the diameter of samples which can be broken by the dead head removing hammer and are made of different materials; and pulling out the pin shaft after breaking the sample, and taking out the sample through the sampling port. The comprehensive test device is a comprehensive test device which integrates multiple functions aiming at the dead head removing hammer; the impact power of the dead head removing hammer and the diameter of a sample made of different materials which can be broken by striking can be tested, the damage degree of the striking frequency to the dead head removing hammer can be tested, and the service life of an internal sealing element can be judged; the test unit is movable by injecting cement into the base sufficiently to resist the impact of the de-feeder hammer on the base without displacement, rather than fixing the base to the ground.
Drawings
The present application is further described below with reference to the drawings and examples.
FIG. 1 is a schematic view of a dead head hammer striking a casting. FIG. 2 is a schematic structural view of a dead head hammer test device; FIG. 3 is a view A-A of FIG. 2; FIG. 4 is a view B-B of FIG. 2; FIG. 5 is an enlarged view of section M of FIG. 2 (with the safety shield and cover plate removed); fig. 6 is a view taken along direction K in fig. 3 (with the safety shield removed).
In the figure: 1-a safety shield; 2-a base; 3-fatigue test sample; 4-lead column sample; 5-breaking the sample; 6-adjusting sleeve; 7-a pin shaft; 8-fatigue test sample sleeve; 9-standing the plate; 10-a cover plate; 11-square hole; 12-a sampling port; 13-breaking the sample sleeve; 14-a card board; 15-vertical plate rib plates; 16-rib plate; 17-a longitudinal beam; 18-a pallet; 19-a cross beam; 20-removing a dead head hammer; 21-protecting the cylinder; 22-riser.
Detailed Description
As shown in fig. 2, the feeder head hammer removing test device comprises a base 2, wherein the base 2 is formed by welding a plurality of cross beams 19 and longitudinal beams 17 together, the feeder head hammer removing test device further comprises two sample sleeves welded on the cross beams 19, three pairs of clamping plates 14 which are horizontally arranged are arranged on the outer sides of the sample sleeves from top to bottom to weld the sample sleeves and the cross beams 19 together, and arc-shaped grooves matched with the outer walls of the sample sleeves in shape are formed in the clamping plates 14; the plane flushes with base 2 upper plane on the sample sleeve, and the sample sleeve includes tired sample sleeve 8 and destroys sample sleeve 13, places adjusting sleeve 6 in destroying sample sleeve 13, and 6 external diameters of adjusting sleeve are unanimous with the internal diameter that destroys sample sleeve 13, and 6 internal diameters of adjusting sleeve are unanimous with the 5 diameters of destruction sample, all have the pinhole on destruction sample sleeve 13 and tired sample sleeve 8 and the adjusting sleeve 6, and round pin axle 7 can be for putting into wherein the sample do the support.
The vertical plate 9 is arranged at the middle position of two sample sleeves on the base 2, the bottom of the vertical plate 9 is welded with the cross beam 19, the back surface of the vertical plate is provided with two vertical plate rib plates 15 which are respectively welded with the vertical plate 9 and the cross beam 19, the impact resistance of the vertical plate 9 is enhanced, the vertical plate 9 is provided with a unthreaded hole for a bolt to pass through, the bolt passes through the unthreaded hole and is screwed into a threaded hole formed in the central position of the bottom of the lead column sample 4 to fix the lead column sample 4 on the vertical plate 9, and the size of impact energy is tested by using.
There is apron 10 base 2 upper end, is provided with the hole on the apron 10 in order to avoid two sample sleeves, riser 9 and riser gusset 15, is provided with square hole 11 on the apron 10 of position about the sample sleeve, makes things convenient for operating personnel to insert and extract round pin axle 7, and base 2 is equipped with sample connection 12 and can takes out the destruction sample 5 in the adjusting sleeve 6.
The safety shield 1 is arranged on the periphery of the base 2, so that the damage to the surrounding environment caused by the flying-out of the sample in the destructive test can be prevented.
The base 2 is provided with a plurality of rib plates 16, the rib plates 16 are welded with longitudinal beams 17, the supporting plates 18 are arranged below the longitudinal beams 17, and cement is injected into a space enclosed by the longitudinal beams 17, the rib plates 16 and the supporting plates 18, so that the cement can resist the impact of a dead head hammer on the base without generating displacement, and the accuracy of impact energy is influenced by relative displacement.
And (3) impact power test: in the technical conditions for air hammers (GB/T25721-2010), a lead column sample with an appropriate size is selected according to the striking energy. And calculating the impact power of the dead head removing hammer theoretically from a dynamic angle according to the operation principle of the dead head removing hammer, and selecting a lead column sample 4 with a proper specification. Fixing the selected lead column sample 4 on a vertical plate 9 of the base 2 by using a bolt, adjusting the working pressure of the dead head removing hammer to the required pressure, aligning the dead head removing hammer protecting cylinder with the lead column sample, horizontally striking, and calculating the impact power of the dead head removing hammer under the working pressure according to the compression amount before and after striking of the lead column sample.
And (3) destruction test: calculating the maximum diameter D of the sample which can be broken by the dead head removing hammer according to the impact energy and the material of the sample tested in the previous step and by the formula (2)maxWhereby the inner diameter is selected to be DmaxThe adjusting sleeve 6 of (1) is placed in a destructive sample sleeve 13 of the base 2, the pin 7 is inserted through a square hole 11 of the destructive sample sleeve 13, and the diameter D is setmaxIs placed in the adjustment sleeve 6. Hammering the test sample by using a dead head, if the test sample can be broken, increasing the diameter of the broken test sample 5 by 10mm, replacing the corresponding adjusting sleeve 6, and performing the impact test again, if the test sample can be broken, continuously increasing the diameter of the broken test sample 6 by 10mm until the test sample cannot be broken; if the test piece cannot be broken, the diameter of the broken sample 5 is reduced by 10mm, and the corresponding adjustment sleeve 6 is replaced to perform the impact test again. And so on until obtaining the maximum diameter D of the breaking sample which can be broken by strikingFruit of Chinese wolfberry。
And (3) fatigue test: selected diameter greater than DFruit of Chinese wolfberryThe fatigue test piece 3 is inserted into a fatigue test piece sleeve 8 of the base 2, the pin shaft 7 is used as a support, the dead head removing hammer is used for impacting the fatigue test piece 3 for a certain number of times in an accumulated mode, and the internal structure of the dead head removing hammer and the damage state of a sealing piece are checked.
Claims (3)
1. A dead head hammer removing test device comprises a base, wherein the base is formed by welding a plurality of cross beams and longitudinal beams together and is characterized in that two sample sleeves are welded on the cross beams of the base; the upper plane of the sample sleeve is flush with the upper plane of the base, an adjusting sleeve is placed in one sample sleeve, the outer diameter of the adjusting sleeve is consistent with the inner diameter of the sample sleeve, the inner diameter of the adjusting sleeve is consistent with the diameter of a damaged sample, and pin holes are formed in the sample sleeve and the adjusting sleeve;
the vertical plate is arranged at the middle position of the two sample sleeves on the base, the bottom of the vertical plate is welded with the cross beam, the back surface of the vertical plate is provided with two vertical plate rib plates which are respectively welded with the vertical plate and the cross beam, the impact resistance of the vertical plate is enhanced, the vertical plate is provided with a unthreaded hole for a bolt to pass through, and the bolt passes through the unthreaded hole and is screwed into a threaded hole formed at the middle position of the bottom of the lead column sample to fix the lead column sample on;
there is the apron base upper end, is provided with the hole on the apron in order to avoid two sample sleeves, riser and riser gusset, is provided with the square hole on the apron of the sample sleeve left and right sides, makes things convenient for operating personnel to insert and extract the round pin axle, and the base is equipped with the sample connection.
2. The dead head hammer test device as claimed in claim 1, wherein a safety shield is provided around the periphery of the base.
3. The dead head hammer removing test device according to claim 1, wherein a plurality of rib plates are arranged in the base, the rib plates are welded with the longitudinal beam, a supporting plate is arranged below the longitudinal beam, and cement is injected into a space defined by the longitudinal beam, the rib plates and the supporting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610889185.5A CN106441848B (en) | 2016-10-11 | 2016-10-11 | Dead head hammer removing test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610889185.5A CN106441848B (en) | 2016-10-11 | 2016-10-11 | Dead head hammer removing test device |
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| Publication Number | Publication Date |
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| CN106441848A CN106441848A (en) | 2017-02-22 |
| CN106441848B true CN106441848B (en) | 2021-03-12 |
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| CN201610889185.5A Expired - Fee Related CN106441848B (en) | 2016-10-11 | 2016-10-11 | Dead head hammer removing test device |
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Citations (9)
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| JP3772218B2 (en) * | 2003-07-15 | 2006-05-10 | 独立行政法人農業・生物系特定産業技術研究機構 | Handle hammer type soil collector |
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-
2016
- 2016-10-11 CN CN201610889185.5A patent/CN106441848B/en not_active Expired - Fee Related
Patent Citations (9)
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| JP3772218B2 (en) * | 2003-07-15 | 2006-05-10 | 独立行政法人農業・生物系特定産業技術研究機構 | Handle hammer type soil collector |
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| CN202453255U (en) * | 2012-02-27 | 2012-09-26 | 陈潇 | Plastic pendulum bob type impact and tensile test device |
| CN103048075A (en) * | 2013-01-08 | 2013-04-17 | 浙江大学 | Impact force testing device |
| CN103162983A (en) * | 2013-02-19 | 2013-06-19 | 西南石油大学 | Evaluation device and evaluation method for air hammer performance |
| JP2015094648A (en) * | 2013-11-12 | 2015-05-18 | 株式会社東洋精機製作所 | Impact type testing device |
| CN105784234A (en) * | 2016-04-01 | 2016-07-20 | 武汉理工大学 | Impact energy and impact frequency measuring device for electrically-driven pneumatic hammers |
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| CN106441848A (en) | 2017-02-22 |
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