A testing device for the tensile strength of mining chains

Abstract

This invention relates to testing equipment in the field of chains, and more particularly to a tensile strength testing device for mining chains. The mining chain tensile strength testing device of this invention involves wrapping the chain around three transmission wheel sets. During the rotation of the transmission chain links, tensile and compressive forces are applied to the chain links. As the chain links pass over gears in the transmission system, continuous bending stress is generated, resulting in a state of combined tensile and bending stress, which improves the test strength of the chain links. During the test, a sandblasting machine continuously sprays fine sand onto the chain links, while the central transmission wheel set pushes the lower side of the chain links downwards into corrosive oil, achieving simultaneous sandblasting and oil immersion treatment of the chain links, effectively simulating actual environmental conditions. This overcomes the technical problems of existing machines and equipment for testing the tensile strength of chains, which cannot expose early failures that occur when the chain bends, and cannot simulate actual environmental conditions.

Description

Technical Field

[0001] This invention relates to testing equipment in the field of chains, and more particularly to a testing device for the tensile strength of mining chains. Background Technology

[0002] Mining chains bear enormous tensile stress and impact loads in critical operations such as underground conveying, hoisting, and traction. If their tensile strength is insufficient, the chain links are prone to plastic deformation or breakage, leading to misalignment of sprockets, increased local wear, and consequently, equipment downtime, personnel injuries, and production safety accidents. Therefore, conducting tensile strength tests on mining chains is the primary means of ensuring their reliable operation in harsh mining environments. This test uses a tensile machine to apply tensile pressure at a specified rate to determine the maximum tensile stress the chain can withstand before breakage, thus verifying whether it meets the design strength requirements. However, existing machinery and equipment can only test pure tensile strength in linear tensile testing, failing to expose early failures that occur when the chain bends. Furthermore, in actual working conditions, mining chains are affected by a combination of factors, including corrosive substances and dust impurities. These factors all damage the tensile properties of mining chains, resulting in actual tensile performance that is far lower than the tensile performance measured under ideal conditions. Summary of the Invention

[0003] To overcome the shortcomings of existing machinery and equipment for testing the tensile strength of chains, which cannot expose early failures of chains when bent and cannot simulate actual environmental conditions, this invention provides a tensile strength testing device for mining chains.

[0004] Technical Solution: A mining chain tensile strength testing device includes a waste loading box, a fixed block, a drive motor, a mounting block, a hydraulic lift, a transverse slider, a hydraulic tension push rod, a transmission wheel set, a sandblasting machine, a nozzle, and support rollers; a fixed block is fixedly connected to the left side of the waste loading box; a first transmission wheel set is connected to the fixed block; a drive motor for driving the corresponding transmission wheel set is installed on the waste loading box; a mounting block is connected to the middle of the waste loading box; a hydraulic lift is installed on the mounting block; a second transmission wheel set is connected to the telescopic component of the hydraulic lift; the right side of the waste loading box... A transverse slider is connected to the side; a third transmission wheel set is connected to the transverse slider; a hydraulic tensioning rod is installed on the waste loading box to drive the transverse slider to move laterally in the left and right direction; the telescopic end of the hydraulic tensioning rod is fixed to the transverse slider; a first chamber structure is provided in the middle of the waste loading box through two first partition structures, and the first chamber is aligned with the bottom of the hydraulic lift; a sandblasting machine is installed on the waste loading box; the nozzle of the sandblasting machine is aligned with the transmission wheel set on the left; two support rollers are rotatably connected inside the waste loading box, and the two first partitions are located between two adjacent support rollers.

[0005] Furthermore, a filter sand hopper is inserted at the bottom of the first chamber of the waste container.

[0006] Furthermore, the transmission wheel set consists of a tensile shaft, a transmission gear, and a front cover; the tensile shafts of the three transmission wheel sets are respectively rotatably connected to the fixed block, the telescopic component of the hydraulic lift, and the transverse slider; the output shaft of the drive motor is fixedly connected to the tensile shaft in the corresponding transmission wheel set; a transmission gear is fixedly connected to the tensile shaft; a rear cover is fixedly connected to the rear side of the tensile shaft; and a front cover is detachably connected to the front side of the tensile shaft.

[0007] Furthermore, a collection box is fixed inside the waste loading box; a guide ramp is connected to the collection box; the guide ramp is connected to the sand storage chamber structure of the sandblasting machine.

[0008] Furthermore, a first fan is installed on the collection box to blow airflow onto the chain ring.

[0009] Furthermore, two ultrasonic flaw detectors are installed on the waste loading box to inspect both sides of the chain links.

[0010] Furthermore, a second fan is installed on the waste loading box to blow hot air onto the chain links, and the second fan is located above the first chamber.

[0011] Furthermore, the mounting block uses an electric slider component, which can drive the hydraulic lift and its connected transmission wheel set to move laterally in the left and right directions.

[0012] Furthermore, the waste loading box is divided into two second chamber structures by two second partition structures, and the second chamber is located to the right of the first chamber; a third support roller is rotatably connected inside the waste loading box, and the two second partitions are located between two adjacent support rollers.

[0013] Furthermore, a cleaning roller brush is rotatably connected to the second chamber of the waste loading box; a motor that drives the cleaning roller brush to rotate is installed on the waste loading box.

[0014] Beneficial Effects: This invention provides a tensile strength testing device for mining chains. The chain is wound around three transmission wheel sets. During the rotation of the transmission chain rings, tensile and compressive forces are applied to the chain rings. When the chain rings pass over gears in the transmission system, they generate continuous bending stress, resulting in a state of combined tensile and bending stress, which improves the test strength of the chain rings. During the test, a sandblasting machine continuously sprays fine sand onto the chain rings, while the transmission wheel sets in the middle push the lower side of the chain rings downwards into corrosive oil stains, achieving simultaneous sandblasting and oil stain immersion treatment of the chain rings, effectively simulating actual environmental conditions. After cleaning the fine sand and oil stains from the surface of the chain rings, an ultrasonic flaw detector can be used to detect cracks on the surface of the chain rings. This overcomes the technical problems of existing machines and equipment for testing the tensile strength of chains, which cannot expose early failures of the chain when bending and cannot simulate actual environmental conditions. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a three-dimensional structural diagram of the sandblasting machine of the present invention;

[0017] Figure 3 This is a three-dimensional cross-sectional view of the waste loading box of the present invention;

[0018] Figure 4 This is a three-dimensional structural diagram of the horizontal slider of the present invention;

[0019] Figure 5 This is an exploded view of the three-dimensional structure of the transmission wheel assembly of the present invention;

[0020] Figure 6 This is a three-dimensional structural diagram of the hydraulic lift of the present invention;

[0021] Figure 7 This is a top view of the waste loading container of the present invention;

[0022] Figure 8 This is a front view of the chain ring of the present invention in its installation state.

[0023] Reference numerals: 1-Waste loading box, 101-First partition, 1010-First chamber, 102-Second partition, 1020-Second chamber, 11-Fixing block, 12-Drive motor, 13-Mounting block, 14-Hydraulic lifter, 15-Horizontal slider, 16-Hydraulic tension push rod, 17-Support roller, 2-Transmission wheel set, 21-Tension shaft, 2101-Fixing thread, 22-Transmission gear, 23-Rear baffle, 24-Front cover, 3-Sandblasting machine, 31-Spray nozzle, 32-Collection box, 321-Guide inclined plate, 4-Filter sand hopper, 5-Ultrasonic flaw detector, 61-First fan, 62-Second fan, 71-Cleaning roller brush, 72-Motor, 8-Chain link. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] Example 1: A testing device for the tensile strength of mining chains, such as... Figures 1-8As shown, the system includes a waste loading box 1, a fixing block 11, a drive motor 12, a mounting block 13, a hydraulic lift 14, a horizontal slider 15, a hydraulic tension push rod 16, a transmission wheel set 2, a sandblasting machine 3, a nozzle 31, and a filter hopper 4. A fixing block 11 is fixedly connected to the left side of the waste loading box 1. The first transmission wheel set 2 is connected to the fixing block 11. The drive motor 12 is mounted on the waste loading box 1. The drive motor 12 is connected to the corresponding transmission wheel set 2. The mounting block 13 is connected to the middle of the waste loading box 1. The hydraulic lift 14 is mounted on the mounting block 13. The telescopic component of the hydraulic lift 14 is connected to the second transmission wheel set 2. A horizontal slider 15 is slidably connected to the right side; a third transmission wheel set 2 is connected to the horizontal slider 15; a hydraulic tensioning push rod 16 is installed on the waste loading box 1; the telescopic end of the hydraulic tensioning push rod 16 is fixed to the horizontal slider 15; a first chamber 1010 structure is provided in the middle of the waste loading box 1 through two first partitions 101, and the first chamber 1010 is aligned with the lower part of the hydraulic lift 14, and the first chamber 1010 is filled with corrosive oil; a sandblasting machine 3 is installed on the waste loading box 1; the nozzle 31 of the sandblasting machine 3 is aligned with the upper part of the transmission wheel set 2 on the left side; a filter sand hopper 4 is inserted into the bottom of the first chamber 1010 of the waste loading box 1.

[0026] like Figure 3 As shown, several support rollers 17 are rotatably connected inside the waste loading box 1, and two first partitions 101 are located between two adjacent support rollers 17.

[0027] like Figure 1 and Figure 4 As shown, the transmission wheel set 2 consists of a tensile shaft 21, a transmission gear 22, and a front cover 24; the tensile shafts 21 of the three transmission wheel sets 2 are respectively rotatably connected to the fixed block 11, the telescopic component of the hydraulic lift 14, and the transverse slider 15; the output shaft of the drive motor 12 is fixedly connected to the tensile shaft 21 in the corresponding transmission wheel set 2; the transmission gear 22 is fixedly connected to the tensile shaft 21; the rear side of the tensile shaft 21 is fixedly connected to the rear side of the tensile shaft 21; the front cover 24 is screwed to the front side of the tensile shaft 21 through the fixing thread 2101.

[0028] like Figure 2 and Figure 3 As shown, a collection box 32 is fixedly connected inside the waste loading box 1; a guide inclined plate 321 is connected to the collection box 32; the guide inclined plate 321 is connected to the sand storage chamber structure of the sandblasting machine 3; and a first fan 61 is installed on the collection box 32.

[0029] The testing steps of the mining chain tensile strength testing equipment of the present invention are as follows.

[0030] After the workers removed the front covers 24 of the three transmission wheel sets 2 from their respective tensile shafts 21, they wound the chain links 8 between the transmission gears 22 of the three transmission wheel sets 2, as follows: Figure 8As shown, the front covers 24 of the three transmission wheel sets 2 are then reattached to the corresponding tensile shafts 21. The chain ring 8 is positioned between the front cover 24 and the rear cover 23. Then, the hydraulic lift 14 pushes the transmission wheel set 2 connected to it downwards. The transmission wheel set 2 pushes the lower middle part of the chain ring 8 downwards into the oil stains in the first chamber 1010. At the same time, the hydraulic tension push rod 16 pulls the transverse slider 15 to the left, so that the chain ring 8 is in an inverted triangular structure state that is taut by the three transmission wheel sets 2. The lower middle part of the chain ring 8 that is pressed downwards is supported by the two support rollers 17 below, preventing the lower middle part of the chain ring 8 that is pressed downwards from contacting the surface of the first partition 101 in the waste box 1.

[0031] Then, the drive motor 12 drives the connected transmission wheel set 2 to drive the chain link 8 to the other two transmission wheel sets 2 to rotate synchronously and slowly, so that each area of ​​the chain link 8 circulates through the oil in the first chamber 1010, so that the surface of the chain link 8 is covered with corrosive oil, simulating the working condition of the chain link 8 being covered with oil for a long time in the mine. At the same time, the sandblasting machine 3 continuously sprays fine sand onto the surface of the chain link 8 through the nozzle 31, simulating the working condition of the chain link 8 being hit by fine sand in the airflow for a long time in the mine. At the same time, the hydraulic tensioning push rod 16, through the transverse slider 15 and its connected transmission wheel set 2, drives the chain link 8 to rotate synchronously and slowly, so that each area of ​​the chain link 8 circulates through the oil in the first chamber 1010, so that the surface of the chain link 8 is covered with corrosive oil, simulating the working condition of the chain link 8 being hit by fine sand in the airflow for a long time in the mine. The drive wheel assembly 2 applies a rightward tensile and compressive force to the chain link 8, and the intensity of the applied tensile and compressive force increases stepwise according to a set program. This achieves the application of tensile and compressive force to the chain link 8 during its rotation. When the chain link 8 passes around the transmission gear 22 in the transmission system, it will generate continuous bending stress and be in a state of combined tensile and bending stress, which improves the test intensity of the chain link 8. It can not only test the fatigue resistance of the chain plate of the chain link 8 under repeated bending, but also test whether the pin and sleeve of the chain link 8 are prone to loosening or abnormal wear under long-term combined stress.

[0032] During the continuous spraying of fine sand onto the surface of the chain link 8 by the spray nozzle 31, the first blower 61 continuously blows airflow downwards onto the surface of the chain link 8, causing the fine sand to fall from the surface of the chain link 8 and be collected in the collection box 32. The fine sand in the collection box 32 falls back into the sand storage chamber structure of the sandblasting machine 3 along the guide inclined plate 321, realizing the recycling of fine sand. During the process of the chain link 8 passing through the oil stains in the first chamber 1010, the fine sand remaining on the surface of the chain link 8 will be washed into the oil stains in the first chamber 1010, and the fine sand in the oil stains in the first chamber 1010 gradually settles downwards. The fine sand is collected in the filter sand hopper 4. The staff only needs to take out the filter sand hopper 4 periodically to quickly pour out the collected fine sand. As the fine sand continuously washes the surface of the chain ring 8, oil stains will gradually adhere to the surface of the recycled fine sand. The staff also needs to periodically check the degree of oil stains on the fine sand in the sandblasting machine 3. If only a small amount of oil stains are attached to the surface of the fine sand, the small amount of oil stains will not affect the normal recycling of the fine sand. If a large amount of fine sand in the sandblasting machine 3 is stuck together due to the oil stains, the fine sand spraying effect of the sandblasting machine 3 will be reduced. At this time, the staff needs to replace the fine sand in the sandblasting machine 3.

[0033] Example 2, based on Example 1 above, as follows: Figures 1-8 As shown, in this embodiment, two ultrasonic flaw detectors 5 are installed on the hydraulic waste loading box 1. The two ultrasonic flaw detectors 5 are located on the left and right sides of the hydraulic lift 14, respectively. The ultrasonic flaw detector 5 on the left faces downward to detect the front side of the upper side of the chain ring 8, and the ultrasonic flaw detector 5 on the right faces upward to detect the back side of the upper side of the chain ring 8. A second fan 62 is installed on the waste loading box 1, and the second fan 62 is located above the first chamber 1010.

[0034] After sandblasting and oil soaking of the chain link 8 are completed, the sandblasting machine 3 stops working, the hydraulic tension push rod 16 stops applying tension and extrusion force to the chain link 8, and the hydraulic lift 14 first drives the transmission wheel group 2 connected to it to rise and leave the first chamber 1010. The transmission wheel group 2 connected to the hydraulic lift 14 does not contact the upper side of the chain link 8. The chain link 8 is slowly rotated by the drive motor 12. At the same time, the second fan 62 blows hot air downwards towards the surface of the chain link 8. The second fan 62 blows the oil stains remaining on the surface of the chain link 8 downwards into the first chamber 1010. At the same time, the hot air can improve the efficiency of oil stains detaching from the surface of the chain link 8 and minimize the amount of oil stains adhering to the surface of the chain link 8. Then, the ultrasonic flaw detectors 5 on the left and right sides respectively perform ultrasonic flaw detection on the front and back of the upper area of ​​the chain link 8 to detect whether there are cracks on the surface of the chain link 8 caused by stretching. Example 3, based on the above Example 2, such as Figures 1-8As shown, the mounting block 13 in this embodiment uses an electric slider component, which can drive the hydraulic lift 14 and its connected transmission wheel set 2 to move laterally in the left and right direction; the waste loading box 1 is divided into a second chamber 1020 structure by two second partitions 102 structures, and the second chamber 1020 is located to the right of the first chamber 1010. The second chamber 1020 structure is filled with oil stain cleaning agent solution; a third support roller 17 is rotatably connected inside the waste loading box 1, and the two second partitions 102 are located between two adjacent support rollers 17; a cleaning roller brush 71 is rotatably connected inside the second chamber 1020 of the waste loading box 1; a motor 72 is installed on the waste loading box 1; the output shaft of the motor 72 is fixedly connected to the cleaning roller brush 71.

[0035] After the sandblasting and oil soaking treatment of the chain link 8 is completed, the sandblasting machine 3 stops working, and the hydraulic tension push rod 16 stops applying tensile and compressive force to the chain link 8. Before performing ultrasonic flaw detection on the chain link 8, the hydraulic lift 14 first drives the transmission wheel set 2 connected to it to rise up away from the first chamber 1010. Then, the electric slider component used by the mounting block 13 drives the hydraulic lift 14 and the transmission wheel set 2 connected to it to move to the right above the second chamber 1020. The hydraulic lift 14 pushes the transmission wheel set 2 to press the lower middle area of ​​the chain link 8 downward into the second chamber 1020. The chain link 8 is placed in the oil stain cleaning solution in the second chamber 1020, and the chain link 8 is kept in close contact with the cleaning roller brush 71. The chain link 8 is driven by the drive motor 12 to slowly rotate and circulate through the oil stain cleaning solution in the second chamber 1020. At the same time, the motor 72 drives the cleaning roller brush 71 to rotate quickly in the oil stain cleaning solution. The cleaning roller brush 71 and the oil stain cleaning solution work together to clean the fine sand and oil stains remaining on the surface of the chain link 8. The lower middle part of the chain link 8 that is pressed down is supported by the two support rollers 17 below, which prevents the lower middle part of the chain link 8 that is pressed down from contacting the surface of the second partition 102 in the waste box 1.

[0036] Then, the hydraulic lift 14 and its connected transmission wheel assembly 2 rise upwards and leave the second chamber 1020. The transmission wheel assembly 2 connected to the hydraulic lift 14 does not contact the upper side of the chain link 8. At the same time, the hydraulic tension push rod 16 pushes the horizontal slider 15 to the right, causing the chain link 8 to leave the second chamber 1020 and straighten it. Then, the drive motor 12 drives the chain link 8 to rotate rapidly, allowing the chain link 8 to shake off the residual oil and cleaning agent on its surface during rapid rotation. At the same time, the second fan 62 blows hot air towards the chain link 8 to accelerate the cleaning of oil stains on the surface of the chain link 8. The drying speed is increased so that the surface of the chain link 8 is free of any oil or oil cleaning agent. Finally, the drive motor 12 drives the chain link 8 to rotate slowly. The ultrasonic flaw detectors 5 on the left and right sides perform ultrasonic flaw detection on the front and back of the chain link 8, respectively, to detect whether there are cracks on the surface of the chain link 8 caused by stretching. Since the surface of the chain link 8 is not covered by oil or oil cleaning agent, the detection accuracy of the ultrasonic flaw detector 5 on the surface of the chain link 8 will be improved, and even small cracks on the surface of the chain link 8 can be accurately identified and detected.

[0037] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all variations and equivalent structures and functions.

Claims

1. A mining chain tensile strength testing equipment, comprising a waste loading box (1); The application is characterized in that It also includes a fixed block (11); The left side of the waste loading box (1) is fixedly connected with the fixed block (11); The first transmission wheel set (2) is connected on the fixed block (11); The driving motor (12) for driving the corresponding transmission wheel set (2) to rotate is installed on the waste loading box (1); The middle part of the waste loading box (1) is connected with the mounting block (13); The hydraulic elevator (14) is installed on the mounting block (13); The telescopic part of the hydraulic elevator (14) is connected with the second transmission wheel set (2); The right side of the waste loading box (1) is slidably connected with the transverse sliding block (15); The third transmission wheel set (2) is connected on the transverse sliding block (15); The hydraulic stretching push rod (16) for driving the transverse sliding block (15) to move horizontally along the left-right direction is installed on the waste loading box (1); The telescopic end of the hydraulic stretching push rod (16) is fixedly connected with the transverse sliding block (15); The middle part of the waste loading box (1) is divided into a first chamber (1010) structure by two first partition plates (101), and the first chamber (1010) is aligned below the hydraulic elevator (14); The sand blasting machine (3) is installed on the waste loading box (1); The nozzle (31) of the sand blasting machine (3) is aligned with the transmission wheel set (2) on the left side; Two supporting rollers (17) are rotatably connected in the waste loading box (1), and the two first partition plates (101) are located between the adjacent two supporting rollers (17).

2. A mine chain tensile strength testing apparatus as claimed in claim 1, characterized in that: The sand filter hopper (4) is inserted into the bottom of the first chamber (1010) of the waste loading box (1).

3. A mine chain tensile strength testing apparatus as defined in claim 1, wherein: The transmission wheel set (2) is composed of a tensile shaft (21), a transmission gear (22) and a front cover (24); The tensile shafts (21) of the three transmission wheel sets (2) are rotatably connected with the fixed block (11), the telescopic part of the hydraulic elevator (14) and the transverse sliding block (15) respectively; The output shaft of the driving motor (12) is fixedly connected with the tensile shaft (21) in the corresponding transmission wheel set (2); The transmission gear (22) is fixedly connected on the tensile shaft (21); The rear baffle (23) is fixedly connected on the rear side of the tensile shaft (21); The front cover (24) is detachably connected on the front side of the tensile shaft (21).

4. A mine chain tensile strength testing apparatus as defined in claim 1, wherein: The collecting box (32) is fixedly connected in the waste loading box (1); The guide inclined plate (321) is connected on the collecting box (32); The guide inclined plate (321) connects the sand storage chamber structure of the sand blasting machine (3).

5. A mine chain tensile strength testing apparatus as defined in claim 4, wherein: The first fan (61) for blowing air flow to the chain ring (8) is installed on the collecting box (32).

6. A mine chain tensile strength testing apparatus according to any one of claims 1 to 5, characterised in that: The ultrasonic flaw detector (5) for detecting the two sides of the chain ring (8) respectively is installed on the waste loading box (1).

7. A mine chain tensile strength testing apparatus as defined in claim 6 wherein: The second fan (62) for blowing hot air flow to the chain ring (8) is installed on the waste loading box (1), and the second fan (62) is located above the first chamber (1010).

8. A mine chain tensile strength testing apparatus as defined in claim 6, wherein: The mounting block (13) uses an electric sliding block component, which can drive the hydraulic elevator (14) and the transmission wheel set (2) connected thereto to move horizontally along the left-right direction.

9. A mine chain tensile strength testing apparatus as defined in claim 8, wherein: The second chamber (1020) is arranged in the waste loading box (1) through the structure of two second partitions (102) and is located at the right side of the first chamber (1010).

10. A mine chain tensile strength testing apparatus as defined in claim 9, wherein: The waste loading box (1) is rotatably connected with a third supporting roller (17), and the two second partitions (102) are located between the adjacent two supporting rollers (17). The waste loading box (1) is rotatably connected with a third supporting roller (17), and the two second partitions (102) are located between the adjacent two supporting rollers (17).

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