Detection device for bolt shearing force

Abstract

The detection device comprises a detection frame, a shearing assembly and a hydraulic cylinder, the hydraulic cylinder is fixed to a top plate of the detection frame, and a piston rod of the hydraulic cylinder can downwards penetrate through the top plate in the vertical direction; the shearing assembly comprises an upper shearing part mounted on the piston rod and a lower shearing part mounted on the bottom plate of the detection frame, the lower shearing part is provided with two supporting lugs extending upwards, and the upper shearing part can extend between the two supporting lugs; each supporting lug is provided with a supporting hole, a shearing hole is formed in the upper shearing piece, a first sleeve, a second sleeve and a third sleeve are sequentially screwed on a screw rod of the to-be-tested bolt, and when the screw rod of the to-be-tested bolt sequentially penetrates through the first supporting hole, the shearing hole and the second supporting hole, the first sleeve, the second sleeve and the third sleeve are sequentially located in the first supporting hole, the shearing hole and the second supporting hole. The first sleeve, the second sleeve and the third sleeve are used for protecting the threads of the to-be-detected bolt, damage to the threads is avoided, and the accuracy of detection data is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of detection devices for bolt shearing force. BACKGROUND

[0002] As a conventional connector, bolts are widely used in the structure of machinery, building, vehicle, due to the movement of structure itself or external force on it, bolt is often subjected to shearing force, so the shear resistance of bolt is very important, and the shear resistance of bolt is directly related to the safe operation of structure, so it is necessary to detect the shear resistance of bolt.

[0003] Patent CN204202992U discloses "bolt shearing test fixture and testing machine", which is through the cooperation of upper and lower shearing plates to realize the shearing test of bolt, the shearing plate directly presses on the thread of the bolt to be tested during work, and the thread of the bolt is damaged first in the test process, forming a weak point, which leads to the deviation of the obtained shear resistance, thereby directly affecting the accuracy of detection data. UTILITY MODEL CONTENT

[0004] To solve the problem that the thread of the bolt is easily damaged during the detection of the shear resistance of the bolt in the prior art, resulting in deviation of the detection data, the present application provides a detection device for bolt shearing force, which comprises a detection frame, a shearing assembly and a hydraulic cylinder, wherein the hydraulic cylinder is fixedly installed on the top plate of the detection frame, and the piston rod of the hydraulic cylinder can be extended downward along the vertical direction and freely pass through the top plate; the shearing assembly comprises an upper shearing piece and a lower shearing piece, wherein the upper shearing piece is fixedly installed on the piston rod of the hydraulic cylinder, and the lower shearing piece is fixedly installed on the bottom plate of the detection frame, the lower shearing piece has two upwardly extending support ears, and a detection cavity is formed between the two support ears, and the upper shearing piece can freely extend into the detection cavity.

[0005] The two support ears are respectively referred to as first support ear and second support ear, a first support hole is provided in the first support ear, a second support hole is provided in the second support ear, a shearing hole is provided in the upper shearing piece, a first sleeve, a second sleeve and a third sleeve are sequentially screwed on the screw rod of the bolt to be tested, and the screw rod of the bolt to be tested can pass through the first support hole, the shearing hole and the second support hole in sequence; when the screw rod of the bolt to be tested passes through the first support hole, the shearing hole and the second support hole in sequence, the first sleeve is located in the first support hole, the second sleeve is located in the shearing hole, and the third sleeve is located in the second support hole.

[0006] When the application works, first, the height of the upper shearing piece is adjusted by the hydraulic cylinder, so that the lower end of the upper shearing piece is inserted into the detection cavity, and the shearing hole is coaxially arranged with the first support hole and the second support hole, then the first sleeve, the second sleeve and the third sleeve are screwed on the screw rod of the bolt to be tested, and then the screw rod of the bolt to be tested is inserted through the first support hole, the shearing hole and the second support hole, and the first sleeve is located in the first support hole, the second sleeve is located in the shearing hole, and the third sleeve is located in the second support hole; then the hydraulic cylinder is started, the upper shearing piece moves relative to the lower shearing piece, the bolt to be tested is sheared, and the corresponding shearing data is obtained. Due to the protection of the first sleeve, the second sleeve and the third sleeve to the thread of the bolt to be tested, the thread will not be damaged during the detection process, and the accuracy of the detection data is improved.

[0007] Further, in order to avoid the end of the second sleeve being inserted into the first support hole or the second support hole, and the first sleeve or the second sleeve being inserted into the shearing hole, causing errors in the detection data, when the screw rod of the bolt to be tested passes through the first support hole, the shearing hole and the second support hole in turn, in the axial direction of the bolt to be tested, the two ends of the first sleeve do not exceed the two ends of the first support hole, the two ends of the second sleeve do not exceed the two ends of the shearing hole, and the two ends of the third sleeve do not exceed the two ends of the second support hole.

[0008] Further, in order to improve the stability of the lower shearing piece, in the horizontal direction, the two ends of the two support ears facing the same end are fixedly connected to the one end plate, so that the detection cavity becomes a cavity with only an upward opening.

[0009] Further, the top plate is fixedly installed on the bottom plate through 3-6 columns, the piston rod of the hydraulic cylinder is fixedly connected to the upper shearing piece through a guide plate, the guide plate extends in the horizontal direction, a guide hole is formed in the guide plate corresponding to each column, and the guide plate is slidably sleeved on each column through the guide hole. The support of the guide plate to the piston rod and the upper shearing piece improves the stability of the piston rod and the upper shearing piece.

[0010] Further, in order to facilitate the installation of the guide plate, a positioning hole is formed in the top plate corresponding to each column, the top plate is sleeved on each column through the positioning hole, two positioning nuts are screwed on each column, the two positioning nuts on each column are located on the upper and lower sides of the top plate respectively, and the positioning nuts are all pressed on the top plate. When the guide plate needs to be replaced, the positioning nuts are screwed upwards until the positioning nuts are completely unscrewed from the columns, the top plate is simultaneously disassembled from the columns, the guide plate is lifted upwards, and the guide plate can be disassembled from the columns. After the replacement of the guide plate is completed, the guide plate and the top plate are installed on the columns according to the reverse steps.

[0011] Further, in order to facilitate the replacement of the shearing assembly, the guide plate is detachably installed on the piston rod of the hydraulic cylinder.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of an embodiment of the utility model.

[0013] Figure 2 is a structural schematic diagram of a shearing assembly.

[0014] Figure 3 is an exploded view of the shearing assembly.

[0015] Figure 4 is a structural schematic diagram of a lower shearing piece.

[0016] Figure 5 is Figure 4 is a view in A-A direction. DETAILED DESCRIPTION

[0017] Referring to Figures 1-5 A device for detecting bolt shearing force, comprising a detection frame 10, a shearing assembly 20 and a hydraulic cylinder 30, the detection frame 10 comprises a bottom plate 11, four upright columns 13 welded on the bottom plate 11, the four upright columns are arranged in a square shape, and each upright column has a threaded segment 131 at the top, which has external threads.

[0018] Corresponding to each upright column, a positioning hole 121 is formed on the top plate 12, the top plate 12 is sleeved on each upright column 13 through the positioning hole 121, and two positioning nuts 132 are screwed on each upright column, the two positioning nuts on each upright column are located on the upper and lower sides of the top plate 12 respectively, and the positioning nuts are all pressed against the top plate.

[0019] The cylinder barrel 31 of the hydraulic cylinder 30 is fixedly installed on the upper surface of the top plate through bolts, a rod passing hole 122 is formed on the top plate, and the piston rod 32 of the hydraulic cylinder can freely pass through the rod passing hole and extend downward in the vertical direction. A guide plate 23 is detachably connected to the lower end of the piston rod 32, and in this embodiment, the piston rod 32 is screwed on the guide plate in a threaded manner.

[0020] The guide plate 23 extends in the horizontal direction, and a guide hole 231 is formed on the guide plate 23 corresponding to each upright column 13, and the guide plate 23 is slidably sleeved on each upright column through the guide hole.

[0021] The shearing assembly 20 comprises an upper shearing piece 22 and a lower shearing piece 21, wherein the upper shearing piece 22 is plate-shaped, and the upper shearing piece is welded on the lower surface of the guide plate, that is, the piston rod of the hydraulic cylinder is fixedly connected to the upper shearing piece through the guide plate; and the lower shearing piece is welded on the upper surface of the bottom plate.

[0022] The lower shearing part 21 has two upwardly extending support ears, which are a first support ear 211 and a second support ear 212 respectively, and a detection cavity 213 is formed between the two support ears, and the upper shearing part can freely extend into the detection cavity. In the embodiment, in the horizontal direction, an end plate 25 is welded to the same end of the two support ears, so that the detection cavity 213 becomes a cavity with only an upward opening.

[0023] A first support hole 241 is arranged in the first support ear 211, a second support hole 242 is arranged in the second support ear 212, and a shearing hole 221 is arranged in the upper shearing part 22. A first sleeve 281, a second sleeve 27 and a third sleeve 282 are sequentially screwed on the screw rod of the bolt to be tested, and the screw rod 51 of the bolt to be tested 50 can sequentially pass through the first support hole 241, the shearing hole 221 and the second support hole 242; when the screw rod of the bolt to be tested sequentially passes through the first support hole, the shearing hole and the second support hole, the first sleeve is located in the first support hole, the second sleeve is located in the shearing hole, and the third sleeve is located in the second support hole.

[0024] And in the axial direction of the bolt to be tested, the two ends of the first sleeve do not exceed the two ends of the first support hole outward, the two ends of the second sleeve do not exceed the two ends of the shearing hole outward, and the two ends of the third sleeve do not exceed the two ends of the second support hole outward. Specifically, in the embodiment, the end faces of the two ends of the first sleeve are flush with the two ends of the first support hole, the end faces of the two ends of the second sleeve are flush with the two ends of the shearing hole, and the end faces of the two ends of the third sleeve are flush with the two ends of the second support hole.

[0025] When the embodiment works, first, the height of the upper shearing part 22 is adjusted by the hydraulic cylinder, so that the lower end of the upper shearing part is inserted into the detection cavity 213, and the shearing hole is coaxially arranged with the first support hole and the second support hole, then the first sleeve, the second sleeve and the third sleeve are screwed on the screw rod 51 of the bolt to be tested 50, and the screw rod of the bolt to be tested passes through the first support hole, the shearing hole and the second support hole from above, and the first sleeve is located in the first support hole, the second sleeve is located in the shearing hole, and the third sleeve is located in the second support hole; and the end faces of the two ends of the first sleeve are flush with the two ends of the first support hole, the end faces of the two ends of the second sleeve are flush with the two ends of the shearing hole, and the end faces of the two ends of the third sleeve are flush with the two ends of the second support hole, then the limiting nut 52 is screwed on the screw rod of the bolt to be tested; then the hydraulic cylinder is started, and the upper shearing part moves relative to the lower shearing part, the bolt to be tested is sheared, and the corresponding shearing data is obtained.

[0026] Due to the protection of the first sleeve, the second sleeve and the third sleeve to the thread of the bolt to be tested, the thread will not be damaged during the detection process, and the accuracy of the detection data is improved.

Claims

1. A device for detecting bolt shear force, characterized by, The detection frame, the shearing assembly and the hydraulic cylinder are included, wherein the hydraulic cylinder is fixedly installed on the top plate of the detection frame, and the piston rod of the hydraulic cylinder can be extended downward along the vertical direction and freely pass through the top plate; the shearing assembly includes an upper shearing piece and a lower shearing piece, wherein the upper shearing piece is fixedly installed on the piston rod of the hydraulic cylinder, and the lower shearing piece is fixedly installed on the bottom plate of the detection frame, the lower shearing piece has two upwardly extending support ears, and a detection cavity is formed between the two support ears, and the upper shearing piece can freely extend into the detection cavity; The two support ears are respectively referred to as a first support ear and a second support ear, a first support hole is arranged in the first support ear, a second support hole is arranged in the second support ear, a shearing hole is arranged in the upper shearing piece, a first sleeve, a second sleeve and a third sleeve are sequentially screwed on the screw rod of the bolt to be detected, and the screw rod of the bolt to be detected can sequentially pass through the first support hole, the shearing hole and the second support hole; when the screw rod of the bolt to be detected sequentially passes through the first support hole, the shearing hole and the second support hole, the first sleeve is located in the first support hole, the second sleeve is located in the shearing hole, and the third sleeve is located in the second support hole.

2. The detection device of claim 1, wherein, When the screw rod of the bolt to be detected sequentially passes through the first support hole, the shearing hole and the second support hole, in the axial direction of the bolt to be detected, the two ends of the first sleeve do not exceed the two ends of the first support hole outward, the two ends of the second sleeve do not exceed the two ends of the shearing hole outward, and the two ends of the third sleeve do not exceed the two ends of the second support hole outward.

3. The detection device of claim 1, wherein, In the horizontal direction, the two support ears fixedly connected to the end plate at the same end, so that the detection cavity becomes a cavity with only an upward opening.

4. The detection device of claim 1, wherein, The top plate is fixedly installed on the bottom plate through 3-6 columns, and the piston rod of the hydraulic cylinder is fixedly connected to the upper shearing piece through a guide plate, the guide plate extends along the horizontal direction, and a guide hole is arranged on the guide plate corresponding to each column, and the guide plate is slidably sleeved on each column through the guide hole.

5. The detection device of claim 4, wherein, A positioning hole is arranged on the top plate corresponding to each column, the top plate is sleeved on each column through the positioning hole, and two positioning nuts are screwed on each column, the two positioning nuts on each column are located on the upper and lower sides of the top plate respectively, and the positioning nuts are all pressed on the top plate.

6. The detection device of claim 4, wherein, The guide plate is detachably installed on the piston rod of the hydraulic cylinder.

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