CN110657968B - Chin strap strength test appearance under safety helmet - Google Patents
Chin strap strength test appearance under safety helmet Download PDFInfo
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- CN110657968B CN110657968B CN201910895864.7A CN201910895864A CN110657968B CN 110657968 B CN110657968 B CN 110657968B CN 201910895864 A CN201910895864 A CN 201910895864A CN 110657968 B CN110657968 B CN 110657968B
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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
- G01N3/02—Details
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/317—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by electromagnetic means
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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
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
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- Helmets And Other Head Coverings (AREA)
Abstract
The invention discloses a chin strap strength tester for a safety helmet, which comprises an electric appliance control box, a test platform, an upright post, a mounting rack, a head die and a lifting mechanism, wherein the lifting mechanism penetrates out of the test platform and is fixed with a sensor module, and a chin strap clamp is fixed on the sensor module; a fixing column is arranged on the mounting rack, one end of the fixing column is fixed with the head die, and the other end of the fixing column is rotatably connected with the mounting rack; the upright post is provided with a conversion device for driving the fixed post to rotate; the upright post is also provided with a clamping seat which is arranged with the upright post in a sliding way and a clamping device which drives the clamping seat to lift; the upper surface of the clamping seat is provided with a positioning groove matched with the arc-shaped surface outside the safety helmet, and the bottom surface of the clamping seat is provided with a puncture hole penetrating through the clamping seat; an impact seat is fixed on the sensor module, and a puncture cone horizontally aligned with the positioning groove is fixed at the top of the impact seat. The invention has the following effects: the chin strap strength tester for the safety helmet can test the chin strap strength of the safety helmet and can also test the puncture resistance of the safety helmet.
Description
Technical Field
The invention relates to the field of engineering detection, in particular to a chin strap strength tester for a safety helmet.
Background
After the finished safety helmet is produced by a safety helmet manufacturer, various detection is carried out on parameters of the safety helmet, wherein the parameters comprise chin strap strength test and puncture resistance performance test, 2 household instruments of a plurality of instrument factories on the market detect the two parameters, few instruments capable of detecting the two parameters simultaneously exist, and the phenomena of complex operation, inconvenient assembly and disassembly and the like generally exist.
At present, chinese utility model patent with publication number CN205679384U discloses a chin strap intensity side direction rigidity tester under safety helmet, including the electrical apparatus control box, be equipped with test platform on the electrical apparatus control box, the last stand that is fixed with of test platform, the stand top is fixed with the crossbeam, crossbeam front end top is fixed with the head mould support column, be fixed with the head mould on the head mould support column, be equipped with elevating system in the electrical apparatus control box, elevating system wears out test platform, and be fixed with the sensor, still include chin strap anchor clamps and side direction rigidity anchor clamps, side direction rigidity anchor clamps are including fixing the last flat board in crossbeam front end bottom respectively and fixing the lower flat board in the sensor top, chin strap anchor clamps are including dismantling the fixing base of fixing in lower flat board top, be equipped with two fixed axles on the fixing base.
The technical scheme can simultaneously realize the function test of the chin strap strength and the lateral rigidity, but has the following defects: the tester can not test the puncture resistance of the safety helmet, and therefore the chin strap strength tester for the safety helmet is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a chin strap strength tester for a safety helmet, which can test the chin strap strength of the safety helmet and the puncture resistance of the safety helmet.
The technical purpose of the invention is realized by the following technical scheme:
a kind of helmet chin strap strength tester, including electrical apparatus control box, test platform fixed on electrical apparatus control box, pillar stand fixed on test platform, mounting bracket fixed on top of pillar stand, head mould set in said mounting bracket and lifting gearing set in electrical apparatus control box, said lifting gearing is worn out of said test platform and fixed with the sensor module, said sensor module is fixed with the chin strap clamp used for testing the strength of the chin strap of the helmet; a fixing column is arranged on the mounting rack, one end of the fixing column is fixed with the head die, and the other end of the fixing column is rotatably connected with the mounting rack; the upright post is provided with a conversion device for driving the fixed post to rotate; the upright post is also provided with a clamping seat which is arranged with the upright post in a sliding way and a clamping device which drives the clamping seat to lift; the upper surface of the clamping seat is provided with a positioning groove matched with the outer arc surface of the safety helmet, and the bottom surface of the clamping seat is provided with a puncture hole penetrating through the clamping seat; an impact seat is fixed on the sensor module, and a puncture cone horizontally aligned with the positioning groove is fixed at the top of the impact seat.
By adopting the technical scheme, when the chin strap of the safety helmet is detected, a detector sets the safety helmet on the head die and winds the chin strap of the safety helmet and the chin strap clamp tightly, then the driving mechanism is started to drive the chin strap clamp to move downwards so that the chin strap is tightened until the chin strap is broken, and the intensity parameter of the chin strap of the safety helmet can be calculated by detecting the upper limit stress of the chin strap clamp in the process of the breakage of the chin strap by using the sensor module; when the puncture resistance of the safety helmet is detected, the conversion device drives the fixed column to rotate until one end of a fixed head die of the fixed column is vertically downward, then the clamping device drives the clamping seat to move upwards until the safety helmet is clamped between the clamping seat and the head die, at the moment, the driving mechanism drives the sensor module, the impact seat and the puncture cone fixed on the impact seat to move upwards until the puncture cone penetrates through the puncture hole and impacts the outer wall of the safety helmet, the stress parameter in the puncture process can be detected through the sensor module, and then the puncture resistance parameter of the safety helmet is calculated, so that the chin strap strength tester of the safety helmet is improved on the basis of a traditional chin strap strength tester, the chin strap strength tester can test the chin strap strength of the safety helmet, the puncture resistance of the safety helmet can be tested, and the detection functions are rich.
The invention is further provided that the conversion device comprises a protection box fixed on the upright post, a worm rotatably connected in the protection box, a servo motor fixed in the protection box and driving the worm to rotate, a conversion shaft rotatably connected in the protection box and a worm wheel sleeved on the conversion shaft and fixed with the conversion shaft, wherein the worm wheel is meshed with the worm; one end, far away from the head die, of the fixing column is arranged in the mounting frame, one end of the conversion shaft penetrates through the upright column, the mounting frame and the fixing column in sequence, and the conversion shaft is rotatably connected with the mounting frame and fixed with the fixing column.
Through adopting above-mentioned technical scheme, when testing personnel need detect the helmet puncture resistance can, servo motor work, its output shaft rotates, it rotates to drive the worm, thereby it rotates to have driven worm wheel and converting shaft, and then the one end that has driven the fixed column fixed head mould revolves the axis rotation of converting shaft, make the head mould rotate to position down, this conversion equipment's setting, the transmission of fixed column is realized by the combination of worm wheel and worm, self-locking performance has, thereby the removal after the fixed column rotation has been prevented.
The clamping device further comprises a sliding groove arranged on the upright post, a sliding block embedded in the sliding groove and connected with the inner wall of the sliding groove in a sliding manner, a driving block fixed on the side wall of the sliding block far away from the clamping seat, a connecting block fixed on the upright post, a driving screw rod vertically arranged on the connecting block and a rotating block fixed at the lower end of the driving screw rod, wherein the side wall of the sliding block far away from the driving block is fixed with the side wall of the clamping seat near the upright post, the lower end of the driving screw rod penetrates through the connecting block and is connected with the connecting block in a rotating manner, the upper end of the driving screw rod penetrates through the upper surface of the driving block and is connected with the driving block in a threaded manner, and the rotating block is arranged.
Through adopting above-mentioned technical scheme, when the one end of fixed column fixed head mould was vertical when down, the safety helmet cover was located on the head mould, at this moment, the measurement personnel rotated the turning block, it rotates to have driven the drive lead screw, the drive block has been driven, the sliding block and press from both sides tight seat and shift up, it laminates and offsets with the arc outer wall of safety helmet to press from both sides the constant head tank on the tight seat until pressing from both sides, thereby make the safety helmet press from both sides tightly between tight seat and the head mould, and the arc surface of the inside and outside both sides is all pressed from both sides tightly when pressing from both sides tightly to.
The invention is further configured that the mounting frame is provided with an upper fixing part, the upper fixing part comprises an upper locking block fixed on the top of the mounting frame, a first locking groove formed in the side wall of the upper locking block close to the fixed column, a first force dividing block fixed on the fixed column and a first locking bolt arranged on the upper locking block, and the first force dividing block is arranged in the first locking groove; the end part of the first locking bolt penetrates through the upper locking block and penetrates into the first force dividing block, and the first locking bolt is in threaded connection with the first force dividing block.
Through adopting above-mentioned technical scheme, when first locking bolt screwed, first minute power piece is locked in first locking groove for the fixed column prevents for locking piece and mounting bracket locking that the fixed column from rotating when carrying out the helmet chin strap strength test, has improved the security.
The invention is further arranged that a first stress block is fixed in the first locking groove, and the side wall of the first stress block, which is close to the outside of the first locking groove, is inclined upwards; the side wall of the first component force block close to the first locking groove is inclined downwards and is abutted to the inclined surface of the first component force block.
Through adopting above-mentioned technical scheme, when first locking bolt screwed, the inclined surface of first minute power piece supports tightly with the inclined surface of first stress piece, and when testing personnel carried out the chin strap strength test under the safety helmet, the head mould received decurrent effort, make the fixed column receive decurrent effort, at this moment, because the inclined plane of first stress piece sets up, make first stress piece have an ascending effort to first minute power piece and fixed column, thereby offset some effort on the fixed column, the bearing performance of fixed column has been improved.
The invention is further configured that the mounting frame is further provided with a lower fixing part, the lower fixing part comprises a lower locking block fixed at the bottom of the mounting frame, a second locking groove formed in the surface, close to the fixing column, of the lower locking block, a second component force block fixed on the fixing column on one side far away from the first component force block, and a second locking bolt arranged on the lower locking block, the end part of the second locking bolt penetrates through the lower locking block and extends into the second locking groove, and the second component force block is in threaded fit with the second locking bolt.
Through adopting above-mentioned technical scheme, when the fixed column rotated to the one end of its fixed head mould vertical downwards, second component of force piece on it got into the second and locked the inslot, and at this moment, second locking bolt screwed for second component of force piece and lower locking piece locking, thereby make the fixed column for the mounting bracket locking, prevent that the fixed column from rotating when carrying out the resistant puncture test of safety helmet, improved the security.
The invention is further arranged that a second stress block is fixed in the second locking groove, and the surface of the second stress block, which is close to the outside of the second locking groove, inclines downwards; the surface of the second force-dividing block close to the inside of the second locking groove is inclined upwards and is abutted against the inclined surface of the second stress block.
Through adopting above-mentioned technical scheme, when second locking bolt screwed, the inclined surface of second partial force piece supports tightly with the inclined surface of second stress piece, and when testing personnel carried out the resistant puncture test of safety helmet, the head mould received ascending impact force, make the fixed column receive ascending effort, at this moment, because the inclined plane of second stress piece sets up downwards, make second stress piece have a decurrent butt effect to second partial force piece and fixed column, thereby offset some effort on the fixed column, the bearing performance of fixed column has been improved.
The invention is further provided that the upper surface of the impact seat is provided with a through hole for passing through the chin strap of the safety helmet.
By adopting the technical scheme, the arrangement of the strap holes is convenient for the detection personnel to wind the chin strap of the safety helmet and the chin strap clamp when the detection personnel tests the strength of the chin strap of the safety helmet.
In conclusion, the beneficial technical effects of the invention are as follows:
1. when the chin strap of the safety helmet is detected, a detector sets the safety helmet on a head die and winds the chin strap of the safety helmet and a chin strap clamp tightly, then a driving mechanism is started to drive the chin strap clamp to move downwards so that the chin strap is tightened until the chin strap is broken, and a sensor module is utilized to detect the upper limit stress of the chin strap clamp in the process of the breakage of the chin strap so as to calculate the strength parameter of the chin strap of the safety helmet; when the puncture resistance of the safety helmet is detected, the conversion device drives the fixed column to rotate until one end of a fixed head die of the fixed column is vertically downward, then the clamping device drives the clamping seat to move upwards until the safety helmet is clamped between the clamping seat and the head die, at the moment, the driving mechanism drives the sensor module, the impact seat and the puncture cone fixed on the impact seat to move upwards until the puncture cone penetrates through the puncture hole and impacts the outer wall of the safety helmet, the stress parameter in the puncture process can be detected through the sensor module, and then the puncture resistance parameter of the safety helmet is calculated, so that the chin strap strength tester of the safety helmet is improved on the basis of a traditional chin strap strength tester of the safety helmet, the chin strap strength of the safety helmet can be tested, the puncture resistance of the safety helmet can be tested, and the detection functions are rich;
2. when the first locking bolt is screwed, the inclined surface of the first force dividing block abuts against the inclined surface of the first stress block, and when a detector tests the chin strength of the safety helmet, the head die is subjected to downward acting force, so that the fixed column is subjected to downward acting force;
3. when the second locking bolt screwed, the inclined surface of the second partial force block abutted against the inclined surface of the second stress block, and when the detection personnel performed the puncture resistance test of the safety helmet, the head die received upward impact force, so that the fixed column received upward acting force, at the moment, because the inclined surface of the second stress block is arranged downward, the second stress block has a downward abutting effect on the second partial force block and the fixed column, thereby offsetting a part of acting force on the fixed column, and improving the bearing performance of the fixed column.
Drawings
FIG. 1 is a schematic view of the overall structure of the embodiment;
FIG. 2 is a schematic view of the internal structure of the head die;
FIG. 3 is a schematic structural view of the conversion apparatus;
FIG. 4 is a schematic horizontal cross-section of a column;
FIG. 5 is a schematic structural view of an upper fixing portion;
fig. 6 is a schematic structural view of the lower fixing portion.
In the figure: 1. an electrical appliance control box; 11. a test platform; 2. a column; 21. a mounting frame; 22. an upper fixing portion; 221. an upper locking block; 222. a first locking groove; 223. a first force-dividing block; 224. a first locking bolt; 225. a first stress block; 23. a lower fixing portion; 231. a lower locking block; 232. a second locking slot; 233. a second force-dividing block; 234. a second locking bolt; 235. a second stress block; 3. a lifting mechanism; 4. a sensor module; 41. an impact base; 42. puncturing a awl; 43. a through hole is formed; 5. a chin strap clamp; 51. a fixed seat; 52. a fixed shaft; 6. fixing a column; 7. a head die; 71. reinforcing columns; 72. a reinforcing block; 8. a conversion device; 81. a protective box body; 82. a worm; 83. a servo motor; 84. a conversion shaft; 85. a worm gear; 9. a clamping device; 91. a clamping seat; 911. positioning a groove; 912. puncturing a hole; 92. a sliding groove; 93. a slider; 94. a drive block; 95. connecting blocks; 96. driving the screw rod; 97. and (6) rotating the block.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the safety helmet chin strap strength tester comprises an electrical appliance control box 1, a test platform 11, an upright post 2, a mounting frame 21, a lifting mechanism 3, a sensor module 4, a chin strap clamp 5, a fixing post 6, a head die 7, a conversion device 8, a clamping seat 91 and a clamping device 9. The electrical appliance control box 1 is of a box-shaped structure, the top of the electrical appliance control box is fixed with the test platform 11, and the upper surface of the test platform 11 is horizontal. The stand 2 is the columnar structure that the cross section is the rectangle, and it sets up in one side that testing platform 11 kept away from the testing personnel station, and the vertical setting of stand 2, and the lower extreme of stand 2 and testing platform 11 upper surface are fixed. The mounting bracket 21 is a U-shaped block structure, which is disposed on the top of the column 2 and fixed to the side wall of the column 2 near the middle of the testing platform 11, and the two ends of the mounting bracket 21 face one side of the column 2. The lifting mechanism 3 is an existing lifting driving module and is composed of an air cylinder, the lifting mechanism 3 is arranged in the electric appliance control box 1, and a piston rod of the lifting mechanism penetrates through the electric appliance control box 1 and penetrates out of the upper surface of the testing platform 11. The sensor module 4 is a force sensor in the prior art, is fixed on the end part of the piston rod of the lifting mechanism 3, and is used for testing the stress parameters on the end part of the piston rod of the lifting mechanism 3. The chin strap holder 5 includes a fixing base 51 and a fixing shaft 52, the fixing base 51 is rectangular block-shaped and fixed on the sensor module 4, and the upper surface of the fixing base 51 is horizontally disposed. The fixed shaft 52 is a circular shaft with a horizontal axis, one end of the fixed shaft 52 is fixed to the side wall of the fixed seat 51 close to the standing position of the inspector, and the other end faces the standing position of the inspector. In addition, two fixed shafts 52 are provided, and the two fixed shafts 52 are horizontally arranged along the side wall of the fixed base 51 connected with the fixed base 51. The sensor module 4 is provided with an impact seat 41 and a puncture cone 42, the impact seat 41 is a rectangular plate-shaped structure and horizontally arranged on the upper side of the fixed seat 51, and the bottom surface of the impact seat 41 is fixed with the upper surface of the fixed seat 51. The upper surface of the impact seat 41 is provided with a through hole 43, the opening of the through hole 43 is rectangular, and the through hole is provided with two positions for passing through the chin strap of the impact seat 41. The puncture cone 42 is a cylindrical structure, the axis of which coincides with the center of the sphere of the head die 7, and the upper end of the puncture cone 42 is cone-shaped. The piercing cone 42 is made of 45# steel, with a cone angle of 60 °, and a cone tip radius of 0.5 mm. Furthermore, the maximum diameter of the puncture cone 42 is 28mm, the total length is 40mm, and the hardness is HRC 45.
As shown in fig. 2, the fixing column 6 is a cylindrical structure, and is vertically disposed on the mounting frame 21, and the lower end of the fixing column 6 is disposed between the inner side walls of the two sides of the mounting frame 21. The head die 7 is a hemispherical hollow structure, the opening of the head die faces the fixing column 6, and a reinforcing column 71 and a reinforcing block 72 are arranged in the head die 7. The reinforcing block 72 is a hemisphere structure, the circular surface of the reinforcing block is fixed with the upper end of the fixing column 6, and the center of sphere of the reinforcing block 72 coincides with the center of sphere of the head die 7. The reinforcing columns 71 are cylindrical structures, the axis passes through the centers of the reinforcing blocks 72, one ends of the reinforcing columns 71 are fixed to the inner wall of the head die 7, the other ends of the reinforcing columns 71 are fixed to the arc-shaped surfaces of the reinforcing blocks 72, and in addition, a plurality of reinforcing columns 71 are arranged, and the plurality of reinforcing columns 71 are distributed in the head die 7 in a dispersed mode.
As shown in fig. 1 and 3, the conversion device 8 includes a protection box 81, a worm 82, a servo motor 83, a conversion shaft 84 and a worm wheel 85, the protection box 81 is a cuboid internal hollow structure and is disposed on one side of the column 2 far away from the testing platform 11, an opening is opened on a side wall of the protection box 81 close to the column 2 and is fixed with a side wall of the column 2 far away from the middle of the testing platform 11, and the protection box 81 is disposed on the top of the column 2. The worm 82 is vertically arranged in the protective box 81, and the upper end of the worm is rotatably connected with the inner top surface of the protective box 81. The servo motor 83 is disposed in the protection box 81 and fixed to the inner bottom surface of the protection box 81, and an output shaft of the servo motor 83 is disposed upward and coaxially fixed to the lower end of the worm 82. The conversion shaft 84 is in a circular shaft shape, the axis of the conversion shaft is horizontal, one end of the conversion shaft 84 is rotatably connected with the inner side wall of the protection box 81 far away from the upright post 2, the other end of the conversion shaft 84 sequentially penetrates through the side wall of the upright post 2 far away from the mounting frame 21, the inner side wall of one side of the mounting frame 21 close to the upright post 2 and the lower end side wall of the fixed shaft 52 and is rotatably connected with the inner side wall of one side of the mounting frame 21 far away from the upright. The worm wheel 85 is arranged in the protective box 81, the worm wheel 85 is sleeved on the conversion shaft 84 and fixed with the conversion shaft, the worm wheel 85 is meshed with the worm 82, when the servo motor 83 rotates, the worm 82 rotates to drive the worm wheel 85 and the conversion shaft 84 to rotate, so that one end of the fixed column 6, which is used for fixing the head die 7, vertically rotates upwards to vertically downwards, and the position and the orientation of the head die 7 are changed.
As shown in fig. 1 and 3, the clamping seat 91 is rectangular and horizontally disposed on one side of the column 2 close to the middle of the testing platform 11, a positioning groove 911 is disposed on the upper surface of the clamping seat 91, the positioning groove 911 is arc-shaped and groove-shaped, and an opening of the positioning groove 911 is circular. The bottom surface of the clamping seat 91 is provided with a puncture 912, the opening of the puncture 912 is circular, the puncture 912 penetrates through the clamping seat 91, and the axis of the puncture 912 coincides with the axis of the puncture cone 42. The clamping device 9 includes a slide groove 92, a slide block 93, a drive block 94, a connecting block 95, a drive screw 96, and a rotating block 97. The sliding groove 92 is opened on the side wall of the upright post 2 close to the clamping seat 91, the length direction of the sliding groove is vertical, and the cross section of the sliding groove 92 is shown in fig. 4. The sliding block 93 is a block structure, the horizontal section of the sliding block is consistent with the cross section of the sliding groove 92, the sliding block 93 is disposed in the sliding groove 92 and is connected with the inner wall in a sliding manner, and two ends of the sliding block 93 respectively penetrate out of the upright column 2. The driving block 94 is rectangular block-shaped and fixed on the side wall of one end of the sliding block 93 far away from the clamping seat 91, and the other end of the sliding block 93 is fixed with the side wall of the clamping seat 91 near the upright post 2. The connecting block 95 is rectangular block-shaped, and is disposed on one side of the column 2 away from the clamping seat 91 and fixed to the column 2, and the connecting block 95 is disposed at the bottom of the column 2. The driving screw 96 is vertically arranged on one side of the upright column 2 far away from the clamping seat 91, the lower end of the driving screw 96 vertically penetrates through the bottom surface of the connecting block 95 and is rotatably connected with the connecting block 95, and the upper end of the driving screw 96 penetrates through the upper surface of the driving block 94 and is in threaded connection with the driving block 94. The rotating block 97 is in a circular block shape, the axis of the rotating block 97 coincides with the axis of the driving screw 96, the rotating block 97 is fixed at the lower end of the driving screw 96, and when a user rotates the rotating block 97, the driving screw 96 rotates to drive the driving block 94 and the sliding block 93 to vertically move, so that the lifting of the clamping seat 91 is driven.
When a detector tests the strength of the chin strap of the safety helmet, one end of the fixed column 6 for fixing the head die 7 is vertically arranged upwards, so that the head die 7 is arranged on the upper side of the mounting frame 21, at the moment, the chin strap of the safety helmet extends to the position of the fixed seat 51 and bypasses the two fixed shafts 52, the chin strap of the safety helmet is abutted against the fixed shafts 52, then the piston rod of the lifting mechanism 3 moves downwards to drive the fixed seat 51 and the fixed shafts 52 to move downwards, the chin strap of the safety helmet is tensioned until the chin strap of the safety helmet is broken, in the process, the sensor module 4 records the stress parameter on the fixed seat 51, and therefore the strength parameter of the chin strap of the safety belt is calculated.
When a detector carries out puncture resistance test on the safety helmet, the servo motor 83 works to drive the worm 82 and the worm gear 85 to rotate, the conversion shaft 84 is made to rotate, the fixing column 6 is driven to rotate until one end of the fixing column 6, which is used for fixing the head die 7, is vertically downward, then the detector sleeves the safety helmet on the head die 7 and rotates the rotating block 97, the clamping seat 91 is made to move upwards until the inner wall of the positioning groove 911 of the clamping seat 91 is attached to and abutted against the arc-shaped outer wall of the safety helmet, so that the safety helmet is clamped, then the piston rod of the lifting mechanism 3 moves upwards to drive the impact seat 41 and the puncture cone 42 to move upwards, so that the puncture cone 42 penetrates through the puncture hole 912 of the clamping seat 91 and impacts the outer wall of the safety helmet, and the sensor module 4 records stress parameters on the puncture cone 42, so that puncture resistance performance parameters of.
As shown in fig. 1 and 5, the mounting frame 21 is provided with an upper fixing portion 22 and a lower fixing portion 23. The upper fixing portion 22 includes an upper locking block 221, a first locking groove 222, a first biasing block 223, and a first locking bolt 224. As shown in fig. 3, the upper locking block 221 is a rectangular block structure, which is fixed to the upper surface of the mounting frame 21 and is disposed on one side of the fixing column 6 away from the two ends of the mounting frame 21. The first locking slot 222 is opened on the sidewall of the upper locking block 221 near the fixing post 6, and has a rectangular opening, and a first stress block 225 is fixed therein. The first stress block 225 is a right-angled triangular block structure, and is fixed to the inner bottom surface and the inner side wall of the first locking groove 222, so that the surface of the first stress block 225 adjacent to the fixing column 6 is inclined upward. The first force component block 223 is a block structure with a right trapezoid vertical section, and when one end of the fixed column 6, which is used for fixing the head die 7, is vertically arranged upwards, the first force component block 223 is fixed on one side of the fixed column 6, which is close to the upper locking block 221, so that the inclined surface of the first force component block 223 is located in the first locking groove 222, and in addition, the inclined surface of the first force component block 223 is inclined downwards and is abutted against the inclined surface of the first stress block 225. The axis of the first locking bolt 224 is horizontal, the end portion thereof passes through the upper locking block 221, the first stressing block 225 and penetrates into the inclined surface of the first force dividing block 223 in sequence, and the first locking bolt 224 is screwed with the first force dividing block 223. When testing personnel carries out the safety helmet chin strap strength test, fixed column 6 is vertical, and head mould 7 sets up in the mounting bracket 21 upside, at this moment, testing personnel screws first locking bolt 224, make first stress piece 225 support tightly with the inclined plane of first component piece 223, thereby effectively prevented the rotation of fixed column 6 when detecting, and when detecting, head mould 7 receives the effort that the safety helmet is down, make fixed column 6 also receive decurrent effect, at this moment, because the inclined plane of first stress piece 225 sets up, part effect on the fixed column 6 has been offset through first component piece 223, thereby the bearing capacity of fixed column 6 has been strengthened.
As shown in fig. 1 and 6, the lower fixing portion 23 includes a lower locking block 231, a second locking groove 232, a second force-dividing block 233, and a second locking bolt 234. Referring to fig. 3, the lower locking block 231 is a rectangular block structure, and is fixed to the bottom surface of the mounting frame 21, and is disposed on one side of the fixing column 6 away from the end portions of the two ends of the mounting frame 21. The second locking slot 232 is opened on the sidewall of the lower locking block 231 close to the fixing column 6, and the opening thereof is rectangular, and a second stress block 235 is fixed therein. The second stress block 235 is a right-angled triangular block structure, and is fixed to the inner top surface and the inner sidewall of the second locking slot 232, so that the surface of the second stress block 235 close to the fixing post 6 is inclined downward. The second force component block 233 is a block structure having a right trapezoid vertical cross section, and when the fixed column 6 is disposed vertically with one end of the fixed head die 7 facing downward, the second force component block 233 is fixed to the fixed column 6 on a side close to the lower locking block 231, so that the inclined surface of the second force component block 233 is located in the second locking groove 232, and further, the inclined surface of the second force component block 233 is inclined upward and abuts against the inclined surface of the second stress block 235. The axis of the second locking bolt 234 is horizontal, the end portion thereof passes through the lower locking block 231, the second stress block 235 in sequence and penetrates into the inclined surface of the second force dividing block 233, and the second locking bolt 234 is screwed with the second force dividing block 233. When the testing personnel carries out the resistant puncture test of safety helmet, the vertical setting of fixed column 6, and head mould 7 sets up in the mounting bracket 21 downside, at this moment, second component power piece 233 is located second locking groove 232, then testing personnel screws second locking bolt 234, make the inclined surface of second stress piece 235 offset with the inclined surface of second component power piece 233, and when the resistant puncture performance of detection safety helmet, puncture awl 42 strikes the safety helmet, make head mould 7 receive ascending impact, because the inclined plane of second stress piece 235 sets up down this moment, the impact on some fixed column 6 has been offset, the bearing performance of fixed column 6 has been improved.
Therefore, the chin strap strength tester for the safety helmet can test the chin strap strength of the safety helmet and the puncture resistance of the safety helmet, has rich detection functions, improves the bearing performance of the fixing column 6 for the conversion head die 7 due to the arrangement of the upper fixing part 22 and the lower fixing part 23, and is high in safety.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. The utility model provides a chin strap strength test appearance under safety helmet, includes electrical apparatus control box (1), is fixed in test platform (11) on electrical apparatus control box (1), is fixed in stand (2) on test platform (11), is fixed in mounting bracket (21) at stand (2) top, set up in head mould (7) on mounting bracket (21) and set up elevating system (3) in electrical apparatus control box (1), elevating system (3) are worn out test platform (11) are fixed with sensor module (4), be fixed with chin strap anchor clamps (5) that are used for testing chin strap strength under the safety helmet on sensor module (4), characterized by: a fixing column (6) is arranged on the mounting rack (21), one end of the fixing column (6) is fixed with the head die (7), and the other end of the fixing column is rotatably connected with the mounting rack (21); a conversion device (8) for driving the fixed column (6) to rotate is arranged on the upright column (2); the upright post (2) is also provided with a clamping seat (91) which is slidably mounted with the upright post (2) and a clamping device (9) which drives the clamping seat (91) to lift; the upper surface of the clamping seat (91) is provided with a positioning groove (911) matched with the arc-shaped surface of the outside of the safety helmet, and the bottom surface of the clamping seat (91) is provided with a puncture hole (912) penetrating through the clamping seat (91); an impact seat (41) is fixed on the sensor module (4), and a puncture cone (42) horizontally aligned with the positioning groove (911) is fixed at the top of the impact seat (41); the conversion device (8) comprises a protection box body (81) fixed on the upright post (2), a worm (82) rotationally connected in the protection box body (81), a servo motor (83) fixed in the protection box body (81) and driving the worm (82) to rotate, a conversion shaft (84) rotationally connected in the protection box body (81) and a worm wheel (85) sleeved on the conversion shaft (84) and fixed with the conversion shaft, wherein the worm wheel (85) is meshed with the worm (82); one end, far away from the head die (7), of the fixed column (6) is arranged in the mounting frame (21), one end of the conversion shaft (84) sequentially penetrates through the upright column (2), the mounting frame (21) and the fixed column (6), and the conversion shaft (84) is rotatably connected with the mounting frame (21) and fixed with the fixed column (6); an upper fixing part (22) is arranged on the mounting frame (21), the upper fixing part (22) comprises an upper locking block (221) fixed on the top of the mounting frame (21), a first locking groove (222) formed in the side wall, close to the fixing column (6), of the upper locking block (221), a first component force block (223) fixed on the fixing column (6) and a first locking bolt (224) arranged on the upper locking block (221), and the first component force block (223) is arranged in the first locking groove (222); the end of the first locking bolt (224) penetrates through the upper locking block (221) and penetrates into the first force dividing block (223), and the first locking bolt (224) is in threaded connection with the first force dividing block (223).
2. The safety helmet chin strap strength tester of claim 1, wherein: the clamping device (9) comprises a sliding groove (92) arranged on the upright post (2), a sliding block (93) embedded in the sliding groove (92) and slidably connected with the inner wall of the sliding groove (92), a driving block (94) fixed on the side wall of the clamping seat (91) far away from the sliding block (93), a connecting block (95) fixed on the upright post (2), a driving screw rod (96) vertically arranged on the connecting block (95) and a rotating block (97) fixed at the lower end of the driving screw rod (96), wherein the side wall of the sliding block (93) far away from the driving block (94) is fixed on the side wall of the clamping seat (91) close to the upright post (2), the lower end of the driving screw rod (96) penetrates through the connecting block (95) and is rotatably connected with the connecting block, the upper end of the driving screw rod (96) penetrates through the upper surface of the driving block (94) and is in threaded connection with the driving block (94), and the rotating block (97) is arranged at the lower side of the connecting block (95).
3. The safety helmet chin strap strength tester of claim 1, wherein: a first stress block (225) is fixed in the first locking groove (222), and the side wall of the first stress block (225) close to the outside of the first locking groove (222) is inclined upwards; the side wall of the first force dividing block (223) close to the inside of the first locking groove (222) is inclined downwards and is abutted with the inclined surface of the first force dividing block (225).
4. The safety helmet chin strap strength tester of claim 1, wherein: still be equipped with down fixed part (23) on mounting bracket (21), fixed part (23) is including being fixed in lower locking piece (231) of mounting bracket (21) bottom, set up in lower locking piece (231) are close to second locking groove (232) on the surface of fixed column (6), be fixed in keep away from on fixed column (6) first component piece (223) one side second component piece (233) and set up in second locking bolt (234) on lower locking piece (231), second locking bolt (234) tip passes lower locking piece (231) and extend to in second locking groove (232), just second component piece (233) with second locking bolt (234) screw-thread fit.
5. The safety helmet chin strap strength tester of claim 4, wherein: a second stress block (235) is fixed in the second locking groove (232), and the surface of the second stress block (235) close to the outside of the second locking groove (232) inclines downwards; the surface of the second force-dividing block (233) adjacent to the inside of the second locking slot (232) is upwardly inclined and abuts against the inclined surface of the second stress block (235).
6. The safety helmet chin strap strength tester of claim 1, wherein: the upper surface of the impact seat (41) is provided with a through hole (43) for passing through a chin strap of the safety helmet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895864.7A CN110657968B (en) | 2019-09-21 | 2019-09-21 | Chin strap strength test appearance under safety helmet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895864.7A CN110657968B (en) | 2019-09-21 | 2019-09-21 | Chin strap strength test appearance under safety helmet |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112161884B (en) * | 2020-09-29 | 2021-08-17 | 山东鲁科工程质量检测有限责任公司 | Adjustable safety helmet chin strap strength test device |
| CN113532819B (en) * | 2021-06-22 | 2024-03-26 | 北京力达塑料制造有限公司 | Safety helmet tension-compression testing machine |
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