CN205580900U - Tightness coefficient measurement device that adsorbs coal body is pressed in area - Google Patents
Tightness coefficient measurement device that adsorbs coal body is pressed in area Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 48
- 239000005341 toughened glass Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 15
- 239000007789 gas Substances 0.000 abstract 3
- 230000002026 carminative effect Effects 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 abstract 1
- 239000010795 gaseous waste Substances 0.000 abstract 1
- 210000002445 nipple Anatomy 0.000 abstract 1
- 238000013522 software testing Methods 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 5
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- 230000009286 beneficial effect Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000003116 impacting effect Effects 0.000 description 3
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- 238000007689 inspection Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
Description
技术领域technical field
本实用新型属于用机械应力测试固体材料的强度特性的技术领域，具体是涉及一种带压吸附煤体的坚固性系数测定装置。The utility model belongs to the technical field of testing the strength characteristics of solid materials by mechanical stress, and in particular relates to a firmness coefficient measuring device for pressure-adsorbed coal bodies.
背景技术Background technique
煤和瓦斯突出是煤矿井下一种极其复杂的动力现象，是地应力、瓦斯和煤的物理力学性能三个因素综合作用的结果，实践表明：坚固性系数越小的煤层突出危险性越大，因而它是判断煤层突出危险性的单项指标之一，但是现在普遍采用的GB/T23561规定的煤的坚固性系数测定方法中人为地确定重锤的提升高度使结果存在随机性，而取到地面的煤样已经改变了瓦斯压力及吸附状态，无法反应井下实际的煤的坚固性。Coal and gas outburst is an extremely complex dynamic phenomenon in underground coal mines. It is the result of the comprehensive action of three factors: ground stress, gas and coal physical and mechanical properties. Practice shows that the smaller the firmness coefficient, the greater the risk of coal seam outburst. Therefore, it is one of the single indicators for judging the risk of coal seam outburst. However, in the measurement method of coal firmness coefficient stipulated in GB/T23561, which is widely used now, the lifting height of the hammer is artificially determined to make the result random, and the result is taken from the ground. The coal sample has changed the gas pressure and adsorption state, which cannot reflect the solidity of the actual coal underground.
中国专利CN204495665U说明书中介绍了一种电磁式含气煤体坚固性系数测试装置，其虽然考虑了煤体的含气状态，但是煤体充气时间短，煤体没有达到饱和吸附状态，采用揺柄来提升电磁铁的形式来提升重锤，存在揺柄处密封性较差及电流直接通入瓦斯气体中等安全隐患，而且每一份样品的测试都要经过对筒体进行充气和排气的过程，步骤繁琐、气体浪费且效率低下，和煤样一起承力反转托板应为反转的需要必将牺牲其承力性能，造成测试结果不准确。In the specification of Chinese patent CN204495665U, an electromagnetic type gas-containing coal solidity coefficient test device is introduced. Although the gas-containing state of the coal is considered, the gas filling time of the coal is short, and the coal does not reach the saturated adsorption state. Lifting the hammer in the form of an electromagnet, there are potential safety hazards such as poor sealing at the handle and direct current flow into the gas gas, and the test of each sample must go through the process of inflating and exhausting the cylinder , The steps are cumbersome, the gas is wasted and the efficiency is low, and the load-bearing and inverting pallet together with the coal sample should be reversed, which will inevitably sacrifice its load-bearing performance, resulting in inaccurate test results.
发明内容Contents of the invention
有鉴于此，本实用新型的目的在于提供一种带压吸附煤体的坚固性系数测定装置，该带压吸附煤体的坚固性系数测定装置通过将承接煤体的罐体和安装有重锤的筒体采用分解式结构，使重锤在冲击煤体过程中以及更换煤体过程中，避免来回充气和排气的过程，减少了瓦斯气体的浪费，提高了测试效率，提高了装置的安全性。In view of this, the purpose of this utility model is to provide a firmness coefficient measuring device for pressure-adsorbed coal body. The cylinder adopts a decomposed structure, so that the heavy hammer avoids the process of inflating and exhausting back and forth during the process of impacting the coal body and the process of replacing the coal body, reducing the waste of gas gas, improving the test efficiency, and improving the safety of the device sex.
为了达到上述目的，本实用新型一种带压吸附煤体的坚固性系数测定装置，包括筒体、高压瓦斯气瓶，该高压瓦斯气瓶通过进气管与筒体连通，该进气管上设有进气阀，所述筒体上设置有气压表，所述筒体内设置有重锤，所述筒体下端依次设置有相互连通的筒体密封阀、储煤罐体密封阀和储煤罐体，所述筒体内设置有与重锤对应的冲击承接盘，所述冲击承接盘下端连接有套装在筒体密封阀、储煤罐体密封阀和储煤罐体内的冲击传递杆套，所述冲击传递杆套与筒体密封阀和储煤罐体密封阀之间处于密封配合，所述冲击传递杆套另一端连接有煤样冲击盘，所述储煤罐体内设置有与煤样冲击盘对应的煤样盘。In order to achieve the above purpose, the utility model is a firmness coefficient measuring device for pressure adsorption coal, which includes a cylinder body and a high-pressure gas cylinder. The high-pressure gas cylinder communicates with the cylinder body through an air inlet pipe. Air intake valve, the cylinder body is provided with a barometer, the cylinder body is provided with a weight, and the lower end of the cylinder body is successively provided with a cylinder body sealing valve, a coal storage tank body sealing valve and a coal storage tank body , the cylinder body is provided with an impact receiving plate corresponding to the weight, and the lower end of the impact receiving plate is connected with an impact transmission rod sleeve set in the cylinder body sealing valve, the coal storage tank body sealing valve and the coal storage tank body, the The impact transmission rod sleeve is in a sealing fit with the cylinder sealing valve and the coal storage tank body sealing valve. The other end of the impact transmission rod sleeve is connected with a coal sample impact plate. Corresponding coal sample tray.
进一步，所述筒体顶部外表面设置有电磁铁，所述电磁铁连接有导线和控制开关。Further, an electromagnet is provided on the outer surface of the top of the cylinder, and the electromagnet is connected with a wire and a control switch.
进一步，所述筒体外侧设置有上下移动且用于在筒体外将重锤从筒体底部提升至筒体顶端的电磁铁吸合处的U型强磁铁。Further, the outside of the cylinder is provided with a U-shaped strong magnet that moves up and down and is used to lift the weight from the bottom of the cylinder to the top of the cylinder at the electromagnet attraction.
进一步，所述筒体密封阀和储煤罐体密封阀通过密封螺纹连接。Further, the cylinder body sealing valve and the coal storage tank body sealing valve are connected through sealing threads.
进一步，所述储煤罐体包括叠置的罐体上部盖体、中部罐体和下部煤样承接罐体，罐体上部盖体和中部罐体之间、中部罐体和下部煤样承接罐体之间均采用密封圈、螺杆紧固连接。Further, the coal storage tank includes stacked tank upper cover body, middle tank body and lower coal sample receiving tank body, between the upper tank body cover body and the middle tank body, the middle tank body and the lower coal sample receiving tank body The bodies are tightly connected by sealing rings and screws.
进一步，所述储煤罐体内设置有卸煤装置，所述卸煤装置包括位于中部罐体内部侧面的卸煤闸门、位于罐体上部盖体的卸煤闸门开关和位于卸煤闸门下方的卸煤口，在卸煤闸门的一侧设有钢化玻璃制成的观察孔。Further, a coal unloading device is provided in the coal storage tank, and the coal unloading device includes a coal unloading gate located on the inner side of the middle tank, a coal unloading gate switch located on the upper cover of the tank body, and a coal unloading gate located below the coal unloading gate. At the coal port, there is an inspection hole made of toughened glass on one side of the coal unloading gate.
进一步，所述下部煤样承接罐体内设有筛孔孔径为0.5mm的分样筛，所述下部煤样承接罐体位于与分样筛高度相同的水平处设有观察孔Ⅰ。Further, the lower coal sample receiving tank is provided with a sampling sieve with a sieve diameter of 0.5mm, and the lower coal sample receiving tank is located at the same level as the sampling sieve and is provided with an observation hole I.
本实用新型的有益效果在于：The beneficial effects of the utility model are:
1、本实用新型带压吸附煤体的坚固性系数测定装置通过将承接煤体的罐体和安装有重锤的筒体采用分解式结构，使重锤在冲击煤体过程中以及更换煤体过程中，避免来回充气和排气的过程，减少了瓦斯气体的浪费，提高了测试效率，提高了装置的安全性；1. The firmness coefficient measuring device of the utility model for pressure-adsorbed coal adopts a decomposed structure for the tank body receiving the coal body and the cylinder body installed with the heavy hammer, so that the heavy hammer can be used in the process of impacting the coal body and replacing the coal body. During the process, the process of inflating and exhausting back and forth is avoided, the waste of gas gas is reduced, the test efficiency is improved, and the safety of the device is improved;
2、本实用新型带压吸附煤体的坚固性系数测定装置能够在不同瓦斯压力下准确测试出吸附饱和煤样的坚固性系数，解决现有设备无法模拟煤在矿井下实际环境、不能正确测试出煤的坚固性系数的问题。2. The firmness coefficient measuring device of the pressure-adsorbed coal body of the utility model can accurately test the firmness coefficient of the adsorbed saturated coal sample under different gas pressures, and solve the problem that the existing equipment cannot simulate the actual environment of coal in the mine and cannot be tested correctly The problem of the firmness coefficient of the coal.
附图说明Description of drawings
为了使本实用新型的目的、技术方案和有益效果更加清楚，本实用新型提供如下附图进行说明：In order to make the purpose, technical solutions and beneficial effects of the utility model clearer, the utility model provides the following drawings for illustration:
图1为本实用新型带压吸附煤体的坚固性系数测定装置的结构示意图。Fig. 1 is a structural schematic diagram of a firmness coefficient measuring device for pressure-adsorbed coal bodies of the present invention.
附图说明：1-筒体；2-储煤罐体；3-高压瓦斯气瓶；4-U型强磁铁；5-进气阀；6-气压表；7-重锤；8-电磁铁；9a-冲击承接盘；9b-冲击传递杆套；10-筒体密封阀；11-储煤罐体密封阀；12-煤样冲击盘；13-罐体上部盖体；14-卸煤闸门开关；15-卸煤闸门；16-卸煤口；17-分样筛；18-下部煤样承接罐体；19-进气管；20-密封螺纹；21-冲击传递杆；22-中部罐体；23-煤样盘。Description of drawings: 1-Cylinder; 2-Coal storage tank; 3-High-pressure gas cylinder; 4-U-shaped strong magnet; 5-Intake valve; 6-Barometer; 7-Heavy hammer; ;9a-impact receiving plate; 9b-impact transfer rod sleeve; 10-cylinder sealing valve; 11-coal storage tank sealing valve; 12-coal sample impact plate; 13-tank upper cover; 14-coal unloading gate Switch; 15-coal unloading gate; 16-coal unloading port; 17-sampling screen; 18-bottom coal sample receiving tank; 19-intake pipe; 20-sealing thread; 21-impact transmission rod; ; 23-coal sample plate.
具体实施方式detailed description
下面将结合附图，对本实用新型的优选实施例进行详细的描述。The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.
如图1所示为本实用新型带压吸附煤体的坚固性系数测定装置的结构示意图；本实用新型带压吸附煤体的坚固性系数测定装置，包括筒体1、高压瓦斯气瓶3，所述高压瓦斯气瓶3通过进气管19与筒体1连通，所述进气管19上设有进气阀5，所述筒体1上设置有气压表6，所述筒体1内设置有重锤7，所述筒体1下端依次设置有相互连通的筒体密封阀10、储煤罐体密封阀11和储煤罐体2，所述筒体1内设置有与重锤7对应的冲击承接盘9a，所述冲击承接盘9a下端连接有套装在筒体密封阀10、储煤罐体密封阀11和储煤罐体2内的冲击传递杆套9b，所述冲击传递杆套9b与筒体密封阀10和储煤罐体密封阀11之间处于密封配合，所述冲击传递杆套9b另一端连接有煤样冲击盘12，所述储煤罐体2内设置有与煤样冲击盘12对应的煤样盘23。As shown in Figure 1, it is the structural representation of the firm coefficient measuring device of the utility model with pressure adsorption coal body; The high-pressure gas cylinder 3 communicates with the cylinder body 1 through an air inlet pipe 19, the air inlet pipe 19 is provided with an air inlet valve 5, the cylinder body 1 is provided with a barometer 6, and the cylinder body 1 is provided with a A heavy hammer 7, the lower end of the cylinder body 1 is provided with a cylinder sealing valve 10, a coal storage tank body sealing valve 11 and a coal storage tank body 2 which communicate with each other in turn, and the cylinder body 1 is provided with a valve corresponding to the weight hammer 7 The impact receiving plate 9a, the lower end of the impact receiving plate 9a is connected with the impact transmission rod sleeve 9b set in the cylinder sealing valve 10, the coal storage tank body sealing valve 11 and the coal storage tank body 2, the impact transmission rod sleeve 9b It is in a sealing fit with the cylinder sealing valve 10 and the coal storage tank body sealing valve 11, the other end of the impact transmission rod sleeve 9b is connected with a coal sample impact plate 12, and the coal storage tank body 2 is provided with a coal sample The coal sample disk 23 corresponding to the impact disk 12 .
本实施例通过重锤7被释放下落撞击冲击承接盘9a，冲击承接盘9a将重锤7撞击力量通过冲击传递杆套9b、煤样冲击盘12传递至煤样盘23上，对煤样盘23上进行破碎，使重锤7与煤样盘23不进行直接接触，另外通过设置有筒体密封阀10和储煤罐体密封阀11，方便将承接煤体的罐体和安装有重锤的筒体采用分解式结构，使重锤在冲击煤体过程中以及更换煤体过程中，避免来回充气和排气的过程，减少了瓦斯气体的浪费，提高了测试效率，提高了装置的安全性。In this embodiment, the heavy hammer 7 is released and falls to hit the impact receiving plate 9a, and the impact receiving plate 9a transmits the impact force of the heavy hammer 7 to the coal sample plate 23 through the impact transmission rod sleeve 9b and the coal sample impact plate 12. 23, so that the weight 7 does not come into direct contact with the coal sample tray 23. In addition, the cylinder body sealing valve 10 and the coal storage tank body sealing valve 11 are provided, so that the tank body that accepts the coal body and the tank body with the weight hammer are installed are convenient. The cylinder adopts a decomposed structure, so that the heavy hammer avoids the process of inflating and exhausting back and forth during the process of impacting the coal body and the process of replacing the coal body, reducing the waste of gas gas, improving the test efficiency, and improving the safety of the device sex.
进一步，优选的所述筒体1顶部外表面设置有电磁铁8，所述电磁铁8连接有导线和控制开关，本实施例通过控制开关接通电源后能够产生磁性将接近的重锤7吸住，断开电源后磁性消失将重锤释放。Further, preferably, an electromagnet 8 is provided on the outer surface of the top of the cylinder body 1, and the electromagnet 8 is connected with a wire and a control switch. In this embodiment, after the control switch is powered on, it can generate magnetism to attract the approaching weight 7. Hold, after the power is disconnected, the magnetism disappears and the hammer is released.
进一步，优选的所述筒体1外侧设置有上下移动且用于在筒体外将重锤7从筒体1底部提升至筒体1顶端的电磁铁8吸合处的U型强磁铁4，U型强磁铁4用于在筒体外将重锤7从筒体底部提升至筒体顶端的电磁铁8吸合处，该结构避免电流直接通入瓦斯气体中等安全隐患。Further, preferably, the outer side of the cylinder 1 is provided with a U-shaped strong magnet 4 that moves up and down and is used to lift the weight 7 from the bottom of the cylinder 1 to the electromagnet 8 at the top of the cylinder 1 outside the cylinder. The type strong magnet 4 is used to lift the weight 7 from the bottom of the cylinder to the suction position of the electromagnet 8 at the top of the cylinder outside the cylinder. This structure avoids the potential safety hazards such as the direct passage of electric current into the gas.
进一步，优选的所述筒体密封阀10和储煤罐体密封阀11通过密封螺纹20连接，该结构有利于拆分筒体和储煤罐体。Further, preferably, the cylinder body sealing valve 10 and the coal storage tank body sealing valve 11 are connected through a sealing thread 20, and this structure is beneficial for disassembling the cylinder body and the coal storage tank body.
进一步，优选的所述储煤罐体2包括叠置的罐体上部盖体13、中部罐体22和下部煤样承接罐体18，罐体上部盖体13和中部罐体22之间、中部罐体22和下部煤样承接罐体18之间均采用密封圈、螺杆紧固连接，该结构有利于避免瓦斯气体泄漏造成的浪费。Further, preferably, the coal storage tank 2 includes a stacked tank upper cover 13, a middle tank 22, and a lower coal sample receiving tank 18. Between the upper tank cover 13 and the middle tank 22, the middle Both the tank body 22 and the lower coal sample receiving tank body 18 are tightly connected by sealing rings and screws, and this structure is beneficial to avoid waste caused by gas leakage.
进一步，优选的所述储煤罐体2内设置有卸煤装置，所述卸煤装置包括位于中部罐体22内部侧面的卸煤闸门15、位于罐体上部盖体13的卸煤闸门开关14和位于卸煤闸门13下方的卸煤口16，在卸煤闸门16的不远一侧设有钢化玻璃制成的观察孔。Further, preferably, the coal storage tank 2 is provided with a coal unloading device, and the coal unloading device includes a coal unloading gate 15 located on the inner side of the middle tank body 22, and a coal unloading gate switch 14 located on the upper cover 13 of the tank body. And be positioned at the coal unloading port 16 below the coal unloading gate 13, be provided with the inspection hole that toughened glass is made on the not far side of the coal unloading gate 16.
进一步，优选的所述下部煤样承接罐体18内设有筛孔孔径为0.5mm的分样筛17，所述下部煤样承接罐体位于与分样筛高度相同的水平处设有观察孔Ⅰ。Further, preferably, the lower coal sample receiving tank body 18 is provided with a sampling sieve 17 with a sieve hole diameter of 0.5mm, and the lower coal sample receiving tank body is located at the same level as the sampling sieve and is provided with an observation hole. I.
其工作原理如下：It works as follows:
1)打开罐体上部盖体13，将煤样放入中部罐体22内的的煤样盘23中，然后将罐体上部盖体13与中部罐体22密封；1) Open the tank upper cover 13, put the coal sample into the coal sample tray 23 in the middle tank 22, and then seal the tank upper cover 13 and the middle tank 22;
2)打开储煤罐体密封阀11，从储煤罐体2的密封螺纹20处接口连接真空泵抽真空后接高压瓦斯气瓶，在特定气压下使煤样充分吸附瓦斯，达到吸附平衡后关闭储煤罐体密封阀11，使储煤罐体2内保持特定的气压，此过程中可以多个储煤罐体2同时进行以提高效率；2) Open the sealing valve 11 of the coal storage tank body, connect the sealing thread 20 of the coal storage tank body 2 to the vacuum pump and then connect to the high-pressure gas cylinder, make the coal sample fully absorb the gas under a specific air pressure, and close it after reaching the adsorption balance The coal storage tank body seal valve 11 keeps a specific air pressure in the coal storage tank body 2, and multiple coal storage tank bodies 2 can be carried out simultaneously in this process to improve efficiency;
3)将筒体1的进气阀门5打开使筒体1内气压达到特定压力，将储煤罐体2与筒体1通过密封螺纹20连接，上部冲量专递杆套9b与下部冲击传递杆21紧密连接；首先先缓慢打开筒体密封阀10并打开进气阀门5使筒体1能达到稳定的特定气压，然后打开罐体的储煤罐体密封阀11，之后要将密封的筒体密封阀10和储煤罐体密封阀11充分打开，使冲击传递杆套9b和21充分自由而不受阀体的作用。3) Open the intake valve 5 of the cylinder 1 to make the air pressure in the cylinder 1 reach a specific pressure, connect the coal storage tank 2 and the cylinder 1 through the sealing thread 20, and connect the upper impulse transmission rod sleeve 9b to the lower impact transmission rod 21 Tight connection; first slowly open the cylinder sealing valve 10 and open the intake valve 5 so that the cylinder 1 can reach a stable specific air pressure, then open the coal storage tank sealing valve 11 of the tank, and then seal the sealed cylinder The valve 10 and the sealing valve 11 of the coal storage tank body are fully opened, so that the shock transmission rod sleeves 9b and 21 are fully free and not affected by the valve body.
4)用U型强磁铁4将重锤7提升至筒顶后打开电磁铁8电源，重锤7稳定吸附于筒顶后移去U型强磁铁4，关掉电磁铁电源，重锤得到释放后自由落下。4) Use the U-shaped strong magnet 4 to lift the heavy hammer 7 to the top of the cylinder, and then turn on the power of the electromagnet 8. After the heavy hammer 7 is stably adsorbed on the top of the cylinder, remove the U-shaped strong magnet 4, turn off the power supply of the electromagnet, and the heavy hammer is released. Then fall freely.
5)重复上一步骤3～5次后，关闭筒体1和储煤罐体2的筒体密封阀10和储煤罐体密封阀11，将储煤罐体2从密封螺纹20连接处与筒体1分离，然后打开卸煤闸门开关14，通过倾斜储煤罐体2使煤样通过卸煤口16落入下部的分样筛17中，同时通过观察孔观察煤样是否完全进入分样筛17中，之后将罐体放在振动台上筛至不再漏下煤粉。5) After repeating the previous step 3 to 5 times, close the cylinder body sealing valve 10 and the coal storage tank body sealing valve 11 of the cylinder body 1 and the coal storage tank body 2, and connect the coal storage tank body 2 from the joint of the sealing thread 20 to the The cylinder body 1 is separated, and then the coal unloading gate switch 14 is opened, and the coal sample is dropped into the lower sampling sieve 17 through the coal unloading port 16 by tilting the coal storage tank 2, and at the same time, it is observed through the observation hole whether the coal sample has completely entered the sampling sieve In the sieve 17, the tank body is placed on the vibrating table to sieve to no longer leaking the pulverized coal.
6)从观察孔Ⅰ观察到分样筛17中不再落下煤灰后，将煤样承接罐体18中的煤灰取出，并按照常规方法进行测量和计算。6) After observing from the observation hole I that coal ash no longer falls from the sampling sieve 17, take out the coal ash in the coal sample receiving tank 18, and measure and calculate according to conventional methods.
最后说明的是，以上优选实施例仅用以说明本实用新型的技术方案而非限制，尽管通过上述优选实施例已经对本实用新型进行了详细的描述，但本领域技术人员应当理解，可以在形式上和细节上对其作出各种各样的改变，而不偏离本实用新型权利要求书所限定的范围。Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in the form Various changes can be made in the above and in the details without departing from the scope defined by the claims of the present invention.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095361A (en) * | 2019-06-20 | 2019-08-06 | 中国矿业大学(北京) | The device of coal body solid coefficient under a kind of measurement adsorbed state |
| CN111965054A (en) * | 2020-09-17 | 2020-11-20 | 河南理工大学 | Automatic change firmness coefficient survey device of visual coal |
| CN114594005A (en) * | 2022-03-01 | 2022-06-07 | 中国矿业大学 | A kind of impact crushing test device and test method for gas-containing coal body |
| CN115308056A (en) * | 2022-07-19 | 2022-11-08 | 中煤科工集团沈阳研究院有限公司 | Test device and method for measuring strength of gas-solid coupled coal rock |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095361A (en) * | 2019-06-20 | 2019-08-06 | 中国矿业大学(北京) | The device of coal body solid coefficient under a kind of measurement adsorbed state |
| CN111965054A (en) * | 2020-09-17 | 2020-11-20 | 河南理工大学 | Automatic change firmness coefficient survey device of visual coal |
| CN114594005A (en) * | 2022-03-01 | 2022-06-07 | 中国矿业大学 | A kind of impact crushing test device and test method for gas-containing coal body |
| CN115308056A (en) * | 2022-07-19 | 2022-11-08 | 中煤科工集团沈阳研究院有限公司 | Test device and method for measuring strength of gas-solid coupled coal rock |
| WO2024016926A1 (en) * | 2022-07-19 | 2024-01-25 | 中煤科工集团沈阳研究院有限公司 | Test device and method for measuring strength of coal rock in gas-solid coupled state |
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