Top plate crushing equipment

Abstract

The utility model provides a top plate crushing device which comprises a containing barrel, a crushing device and a crushing device. The conveying pump is provided with a feeding hole communicated with the accommodating cavity and a discharging hole which is arranged at an interval with the feeding hole; the inner cylinder can be inserted into a drill hole and is matched with the cross section of the drill hole, and the inner cylinder is provided with an insertion end and a grouting end; the plug body is arranged at the grouting end; the feeding pipe is arranged in the plug body in a penetrating mode, the first end of the feeding pipe can be communicated with the discharging port, and the second end of the feeding pipe extends into the inner cylinder; the backflow cooling pipe is arranged on the plug body in a penetrating mode and located on one side of the feeding pipe, the first end of the backflow cooling pipe is located outside the plug body, and the second end of the backflow cooling pipe extends into the inner cylinder. According to the technical scheme, the problem that in the related technology, when a roof is broken through a deep hole blasting mode, the underground construction safety is poor is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of roof crushing in goaf areas, in particular to a roof crushing device. Background Art

[0002] In the process of breaking the roof in the coal mine goaf area, the roof above the two ends of most coal mine working faces is relatively hard. Although the anchor trays and anchor cable trays have been removed from the roof of the goaf area at both ends, they have not collapsed in time, resulting in a large area of ​​hanging roof, affecting the safe production of the coal mine working face.

[0003] In the related art, deep hole blasting is usually used to blast the roof to break the roof, but since deep hole blasting requires the use of explosives, the transportation and use of explosives are very dangerous, and open flames and smoke are generated during blasting, and the safety of underground construction is poor. Utility Model Content

[0004] The main purpose of the utility model is to provide a roof breaking device to solve the problem of poor construction safety in the well when the roof is broken by deep hole blasting in the related art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a roof crushing equipment, including: a accommodating barrel, the accommodating barrel has a accommodating cavity; a conveying pump, the conveying pump has a feed port connected to the accommodating cavity and a discharge port arranged at a distance from the feed port; an inner tube, which can be inserted into the borehole and adapted to the cross-section of the borehole, the inner tube having an insertion end and a grouting end; a plug body, which is arranged at the grouting end; a feed pipe, the feed pipe is passed through the plug body, the first end of the feed pipe can be communicated with the discharge port, and the second end of the feed pipe extends into the inner tube; a reflux cooling pipe, the reflux cooling pipe is passed through the plug body and is located on one side of the feed pipe, the first end of the reflux cooling pipe is located outside the plug body, and the second end of the reflux cooling pipe extends into the inner tube.

[0006] Furthermore, the top plate crushing equipment also includes a connecting structure, a first end of the connecting structure is connected to the discharge port, and a second end of the connecting structure can be selectively detachably connected to the first end of the feed pipe and the first end of the reflux cooling pipe, and the connecting structure has a filling feed state connected to the first end of the feed pipe and a cooling water inlet state connected to the first end of the reflux cooling pipe.

[0007] Furthermore, the connecting structure includes a connecting pipe, a quick connector arranged at the first end of the connecting pipe and a stop valve arranged on the connecting pipe, the second end of the connecting pipe is connected to the discharge port, and the quick connector is detachably connected to the first end of the feed pipe and the first end of the reflux cooling pipe.

[0008] Furthermore, a material passing opening is provided on the end wall of the insertion end.

[0009] Further, the second end of the reflux cooling tube protrudes from the second end of the feed tube.

[0010] Furthermore, the top plate crushing device also includes an air motor and a stirring paddle connected to the rotating shaft of the air motor, and the stirring paddle extends into the accommodating chamber.

[0011] Furthermore, the stirring paddle includes a rotating rod connected to the rotating shaft of the pneumatic motor and a first blade group and a second blade group arranged on the rotating rod, and the first blade group and the second blade group are arranged at intervals along the axial direction of the rotating rod.

[0012] Furthermore, the containing barrel has an upwardly arranged feed opening, which is connected to the containing chamber. The top plate crushing device also includes a mounting plate arranged on the containing barrel, which is connected to the side walls of the containing barrel on both sides opposite to each other at the feed opening, and the conveying pump is arranged on the mounting plate.

[0013] Further, the mounting plate includes a first plate body and a second plate body connected to the first plate body, one end of the first plate body and one end of the second plate body are respectively connected to the side walls of the accommodating barrel on both sides of the feed opening, the delivery pump is arranged on the first plate body, the area of ​​the first plate body is larger than the area of ​​the second plate body; and / or, the suction pipe of the delivery pump passes through the mounting plate and extends into the accommodating cavity, and the feed port is arranged at one end of the suction pipe.

[0014] Furthermore, a discharge pipe is provided on the containing barrel, and the discharge pipe is provided at the bottom of the containing barrel and is communicated with the containing cavity.

[0015] Applying the technical solution of the utility model, the top plate crushing equipment includes: a containing barrel, a conveying pump, an inner tube, a plug body, a feed pipe and a reflux cooling pipe. The containing barrel has a containing cavity. The conveying pump has a feed port connected to the containing cavity and a discharge port spaced apart from the feed port. The inner tube can be inserted into the borehole and adapted to the cross-section of the borehole, and the inner tube has an insertion end and a grouting end. The plug body is arranged at the grouting end. The feed pipe is passed through the plug body, the first end of the feed pipe can be communicated with the discharge port, and the second end of the feed pipe extends into the inner tube. The reflux cooling pipe is passed through the plug body and is located on one side of the feed pipe, the first end of the reflux cooling pipe is located outside the plug body, and the second end of the reflux cooling pipe extends into the inner tube. In this way, the expansion agent slurry can be placed in the receiving barrel, the inner barrel is inserted into the borehole, and the delivery pump delivers the expansion agent slurry in the receiving chamber of the receiving barrel to the feed pipe, and the expansion agent slurry in the feed pipe can enter the inner barrel. When the inner barrel is filled with the expansion agent slurry, part of the expansion agent slurry flows out from the reflux cooling pipe, so that the operator can know that the inner barrel is full of expansion agent slurry by observing the outside of the plug body. The setting of the plug body facilitates the installation of the feed pipe and the reflux cooling pipe at the grouting end of the inner barrel. In addition, when the expansion agent slurry in the feed pipe enters the inner barrel, the air in the inner barrel can be discharged from the reflux cooling pipe, so that the pressure in the inner barrel can be equal to the atmospheric pressure, so that the inner barrel can be filled with expansion agent slurry. The inner barrel is adapted to the cross section of the borehole to increase the force of the expansion agent slurry in the inner barrel on the rock formation at the borehole when it expands. After the full expansion agent slurry in the inner cylinder reacts for a preset time, the expansion force of the full expansion agent slurry gradually increases to exert force on the rock formation at the borehole, so that the rock formation at the borehole can produce cracks and slowly break and fall, so as to break the roof. The use of expansion agent slurry injected into the inner cylinder placed in the borehole to break the roof avoids the problem of open flames and smoke generated when using explosives in the related art, reduces the danger, and improves the safety of construction underground. Therefore, the technical solution of the present application effectively solves the problem of poor construction safety underground when the roof is broken by deep hole blasting in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the top plate crushing device according to the utility model is shown;

[0018] Figure 2 Shows Figure 1 A schematic front view of an inner cylinder, a feed pipe, a reflux cooling pipe and a plug body of a top plate crushing device;

[0019] Figure 3 Shows Figure 1 A three-dimensional structural schematic diagram of a connection structure of a roof crushing device;

[0020] Figure 4 A cross-sectional schematic diagram is shown when a drill hole according to an embodiment of the utility model is located between two sides of a tunnel;

[0021] Figure 5 Shows Figure 4 A schematic cross-sectional view in the direction Ⅰ-Ⅰ;

[0022] Figure 6 Shows Figure 4 A schematic cross-sectional view in the II-II direction;

[0023] Figure 7 A cross-sectional schematic diagram from another perspective is shown when the drill hole according to an embodiment of the utility model is located between two sides of a tunnel;

[0024] Figure 8 Shows Figure 7 A schematic cross-sectional view along the AA direction;

[0025] Fig. 9 Shows Figure 7 Schematic cross-sectional view along the BB direction.

[0026] The above drawings include the following reference numerals:

[0027] 10. containing barrel; 11. feeding opening; 121. first plate body; 122. second plate body; 13. discharge pipe;

[0028] 20. Delivery pump; 21. Suction pipe;

[0029] 30. Inner cylinder; 31. Material passing opening;

[0030] 40. Plug body;

[0031] 50. Feed pipe;

[0032] 60. Reflux cooling pipe;

[0033] 70. Connection structure; 71. Connection pipe; 72. Quick connector; 73. Stop valve;

[0034] 80. Pneumatic motor;

[0035] 91. Rotating rod; 92. First blade group; 93. Second blade group. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0039] like Figures 1 to 3 As shown, applying the technical solution of this embodiment, the top plate crushing equipment includes: a holding barrel 10, a delivery pump 20, an inner tube 30, a plug body 40, a feed pipe 50 and a reflux cooling pipe 60. The holding barrel 10 has a holding cavity. The delivery pump 20 has a feed port connected to the holding cavity and a discharge port spaced from the feed port. The inner tube 30 can be inserted into the borehole and adapted to the cross section of the borehole, and the inner tube 30 has an insertion end and a grouting end. The plug body 40 is arranged at the grouting end. The feed pipe 50 is arranged through the plug body 40, the first end of the feed pipe 50 can be communicated with the discharge port, and the second end of the feed pipe 50 extends into the inner tube 30. The reflux cooling pipe 60 is arranged through the plug body 40 and is located on one side of the feed pipe 50, the first end of the reflux cooling pipe 60 is located outside the plug body 40, and the second end of the reflux cooling pipe 60 extends into the inner tube 30.

[0040] In this way, the expansion agent slurry can be placed in the receiving barrel 10, the inner barrel 30 is inserted into the drilled hole, and the delivery pump 20 delivers the expansion agent slurry in the receiving chamber of the receiving barrel 10 to the feed pipe 50, and the expansion agent slurry in the feed pipe 50 can enter the inner barrel 30. When the inner barrel 30 is filled with the expansion agent slurry, part of the expansion agent slurry flows out from the reflux cooling pipe 60, so that the operator can know that the inner barrel 30 is full of the expansion agent slurry by observing the outside of the plug body 40. The setting of the plug body 40 facilitates the installation of the feed pipe 50 and the reflux cooling pipe 60 at the grouting end of the inner barrel 30. In addition, when the expansion agent slurry in the feed pipe 50 enters the inner barrel 30, the air in the inner barrel 30 can be discharged from the reflux cooling pipe 60, so that the pressure in the inner barrel 30 can be equal to the atmospheric pressure, so that the inner barrel 30 can be filled with the expansion agent slurry. The inner cylinder 30 is adapted to the cross-section of the borehole to increase the force exerted on the rock formation at the borehole when the expansion agent slurry in the inner cylinder 30 expands. After the full expansion agent slurry in the inner cylinder 30 reacts for a preset time, the expansion force of the full expansion agent slurry gradually increases to exert force on the rock formation at the borehole, so that the rock formation at the borehole can produce cracks and slowly break and fall, so that the top plate is broken. The use of expansion agent slurry injected into the inner cylinder 30 placed in the borehole to break the top plate avoids the problem of open flames and smoke generated when using explosives in the related art, reduces the danger, and improves the safety of construction underground. Therefore, the technical solution of the present application effectively solves the problem of poor construction safety underground when the top plate is broken by deep hole blasting in the related art.

[0041] like Figures 1 to 3As shown, the top plate crushing device also includes a connecting structure 70, the first end of which is connected to the discharge port, and the second end of which is selectively detachably connected to the first end of the feed pipe 50 and the first end of the reflux cooling pipe 60. The connecting structure 70 has a filling and feeding state connected to the first end of the feed pipe 50 and a cooling and water inlet state connected to the first end of the reflux cooling pipe 60. The setting of the connecting structure 70 enables the material in the holding barrel 10 to be transported to the feed pipe 50 or the reflux cooling pipe 60 through the discharge port. When the connecting structure 70 is in the filling and feeding state, the material in the holding barrel 10 is full of expansion agent slurry, and the full expansion agent slurry enters the inner barrel 30 through the connecting structure 70 and the feed pipe 50 to apply force to the drill hole outside the inner barrel 30. When the inner tube 30 is filled with expansion agent slurry and the connection structure 70 is in the cooling water inlet state, the material in the container 10 is coolant, and the coolant enters the reflux cooling pipe 60 through the connection structure 70 to fill the reflux cooling pipe 60, avoiding the problem that the reflux cooling pipe 60 is an empty pipe and the expansion agent slurry squeezes the reflux cooling pipe 60, thereby wasting part of the expansion force, and further increases the force exerted by the expansion agent slurry on the rock formation at the borehole. In addition, the coolant in the reflux cooling pipe 60 can cool the full expansion agent slurry outside the reflux cooling pipe 60, reducing the possibility of the full expansion agent slurry heating up and spraying out of the reflux cooling pipe 60.

[0042] In this embodiment, when the expansion agent slurry is injected into the inner cylinder 30 and part of the expansion agent slurry flows out of the reflux cooling pipe 60, the connection structure 70 is removed from the first end of the feed pipe 50, and the first end of the feed pipe 50 is disconnected from the outside, such as by bending and fixing or bundling the first end of the feed pipe 50. Then, the connection structure 70 is connected to the first end of the reflux cooling pipe 60, and coolant is injected into the reflux cooling pipe 60 so that the coolant fills the reflux cooling pipe 60.

[0043] like Figures 1 to 3 As shown, the connection structure 70 includes a connection pipe 71, a quick connector 72 disposed at the first end of the connection pipe 71, and a stop valve 73 disposed on the connection pipe 71. The second end of the connection pipe 71 is communicated with the discharge port, and the quick connector 72 is detachably connected to the first end of the feed pipe 50 and the first end of the reflux cooling pipe 60. The setting of the quick connector 72 facilitates the connection pipe 71 to be quickly switched between the feed pipe 50 and the reflux cooling pipe 60, thereby improving work efficiency. The setting of the stop valve 73 facilitates the control of the conduction and disconnection of the connection pipe 71, and is easy to operate.

[0044] like Figures 1 to 3As shown, a feeding opening 31 is provided on the end wall of the insertion end. In this way, when the depth of the borehole is greater than the length of the inner cylinder 30, the expansion agent slurry can flow into the borehole longer than the inner cylinder 30 through the feeding opening 31, so that the expansion agent slurry can better fill the borehole, further increase the force of the expansion agent slurry on the borehole, and make the top plate crushing effect better.

[0045] like Figures 1 to 3 As shown, the second end of the reflux cooling pipe 60 protrudes from the second end of the feed pipe 50. In this way, when the expansion agent slurry is injected into the insertion end close to the inner cylinder 30, the expansion agent slurry flows out from the reflux cooling pipe 60. The expansion agent slurry fills the inner cylinder 30 more fully, so as to further increase the force of the expansion agent slurry on the drilling hole, so that the effect of breaking the top plate is better.

[0046] like Figures 1 to 3 As shown, the roof crushing equipment also includes an air motor 80 and a stirring paddle connected to the rotating shaft of the air motor 80, and the stirring paddle extends into the accommodating chamber. The arrangement of the air motor 80 and the stirring paddle facilitates the configuration of the expansion agent slurry. In addition, the selection of the air motor 80 reduces the demand for electric energy, saves energy and reduces safety risks. In this embodiment, the air motor 80 is connected to the wind pressure pipeline interface of the underground working surface, and the air motor 80 is driven to work by the wind pressure of the underground working surface, which saves energy and reduces safety risks.

[0047] like Figures 1 to 3 As shown, the stirring paddle includes a rotating rod 91 connected to the rotating shaft of the pneumatic motor 80, and a first blade group 92 and a second blade group 93 arranged on the rotating rod 91, and the first blade group 92 and the second blade group 93 are arranged at intervals along the axial direction of the rotating rod 91. The arrangement of the first blade group 92 and the second blade group 93 enables the first blade group 92 and the second blade group 93 to rotate simultaneously when the rotating shaft of the pneumatic motor 80 rotates, so that the expansion agent slurry is stirred more evenly, which is convenient for the configuration of the expansion agent slurry.

[0048] In this embodiment, the top plate crushing device further comprises a base and a roller arranged below the base. The receiving barrel 10 is arranged on the base. The first blade group 92 comprises a plurality of blades arranged at intervals along the circumference of the rotating rod 91, and the second blade group 93 has the same structure as the first blade group 92.

[0049] like Figures 1 to 3As shown, the receiving barrel 10 has a feed opening 11 arranged upward, and the feed opening 11 is connected to the receiving chamber. The top plate crushing device also includes a mounting plate arranged on the receiving barrel 10, the mounting plate is connected to the side walls of the receiving barrel 10 at the feed opening 11 on both sides thereof, and the delivery pump 20 is arranged on the mounting plate. The arrangement of the mounting plate facilitates the arrangement of the delivery pump 20, making the structure of the top plate crushing device more compact. In addition, the arrangement of the feed opening 11 facilitates the addition of raw materials into the receiving barrel 10.

[0050] like Figures 1 to 3 As shown, the mounting plate includes a first plate body 121 and a second plate body 122 connected to the first plate body 121, and one end of the first plate body 121 and one end of the second plate body 122 are respectively connected to the side walls of the receiving barrel 10 at the feed opening 11 on both sides thereof. The delivery pump 20 is arranged on the first plate body 121, and the area of ​​the first plate body 121 is larger than the area of ​​the second plate body 122. In this way, the structure of the mounting plate is more compact, and the first plate body 121 without the delivery pump 20 is arranged smaller, so that the feed opening 11 can be better avoided, so that the operator can add raw materials into the feed opening 11. The suction pipe 21 of the delivery pump 20 passes through the mounting plate and extends into the receiving cavity, and the feed port is arranged at one end of the suction pipe 21. In this way, it is convenient for the suction pipe 21 of the delivery pump 20 to absorb the material in the receiving cavity, and the structure is simple and easy to install.

[0051] In other embodiments, the mounting plate includes a first plate body 121 and a second plate body 122 connected to the first plate body 121, and one end of the first plate body 121 and one end of the second plate body 122 are respectively connected to the side walls of the receiving barrel 10 at the feed opening 11 on opposite sides. The delivery pump 20 is disposed on the first plate body 121, and the area of ​​the first plate body 121 is larger than the area of ​​the second plate body 122. Alternatively, the suction pipe 21 of the delivery pump 20 passes through the mounting plate and extends into the receiving cavity, and the feed port is disposed at one end of the suction pipe 21.

[0052] like Figures 1 to 3 As shown, a discharge pipe 13 is provided on the receiving barrel 10, and the discharge pipe 13 is provided at the bottom of the receiving barrel 10 and communicated with the receiving cavity. The provision of the discharge pipe 13 facilitates the discharge of the material in the receiving barrel 10 and facilitates the cleaning operation of the receiving barrel 10.

[0053] The inventor found that currently underground coal mines are mainly mined by longwall coal mining working faces. Since there are hard roofs above many coal seams in my country, during the initial mining of the working face, the hard roof is difficult to collapse, resulting in a large initial breaking step of the hard roof, a large suspended roof area before breaking, and a large area of ​​empty roof area in the goaf. During the normal mining of the working face, the suspended roof area at both ends of the working face is large, and the periodic large-scale collapse of the roof will seriously affect the safe production of the working face. In today's roof caving technology, the roofs above the two ends of most coal mine working faces are relatively hard. Although the roofs on the goaf side of the two ends have removed the anchor tray and the anchor cable tray, they have not collapsed in time, resulting in a large area of ​​suspended roof, and at the same time, it will cause high support pressure and high gas content in the upper corner. In order to improve the formation of a large area of ​​empty roof area in the goaf, prevent the large area of ​​suspended roof on the end of the working face, and achieve the effect of mining and venting, some mines use deep hole blasting, hydraulic fracturing and other methods to caving. However, the above-mentioned top-release methods all have disadvantages: deep hole blasting is too dangerous, and the storage, transportation and approval of explosives are too inconvenient. In addition, deep hole blasting with explosives produces open flames and smoke, which is not conducive to underground construction safety. It is also inconvenient to use blasting to release the top after a suspended top appears. Hydraulic fracturing requires larger equipment, has low construction efficiency, interferes with production, and the low-lying rock formations to be fractured are affected by anchor rods, anchor cable holes and rock formation cracks. Water leakage is common during the fracturing process, and the top-release effect is often poor. Therefore, previous treatment methods have certain limitations in terms of safety, construction efficiency, and adaptability to conditions.

[0054] By applying the technical solution of this embodiment, the two ends of the coal mining face can be caved by static expansion fracturing. The artificial forced caving of the two ends of the coal mining face is realized by non-explosive methods, which replaces methods such as explosive blasting, solves the technical problem of large-area hanging top of the top plate of the end of the goaf, achieves the effect of mining and venting the top plate of the end of the goaf, and reduces the potential safety accidents caused by large-area collapse of the end. It is flexible to use and has strong adaptability, which is convenient for construction at any location in the coal mine working face. The expansion agent slurry is prepared by adding water to the static expansion agent. The price of the static expansion agent, the feed pipe 50 and the reflux cooling pipe 60 is low, which reduces the cost. The roof crushing equipment is small in size, easy to transport, and easy to use. The containing barrel 10 and the inner cylinder 30 can be carried by a single operator. It has high safety. The static expansion agent can achieve safe crushing of the roof under the conditions of no vibration, no noise, no flying stones, no harmful gases, no pollution, and no pollution. It is simple to operate. The static expansion agent has the characteristics of low explosion velocity, slow loading, and simple operation, which is convenient for operators to learn. The roof crushing effect is good, and the expansion pressure generated by the static expansion agent can reach 50MPa to 70MPa, which is much greater than the tensile strength of the roof. The construction plan is flexible, and the amount of static expansion agent can be dynamically changed according to the strength of the roof, on-site construction and production progress, and the spacing, length and angle of the drilling holes can also be dynamically changed.

[0055] The technical solution of this embodiment adopts a non-blasting and fracturing roof caving method to realize the manual roof caving of the two ends, which can be carried out in parallel with other processes, and does not require the interlocking blasting of "one shot and three inspections" similar to blasting operations and the requirement to evacuate people at a certain distance before and after the blasting operation site. This embodiment has the technical advantages of simple process operation, low construction cost, and safe control. After the roof crushing equipment is put into use, it can solve the technical problem that the two ends of the mining face cannot be timely dropped, reduce the safety risks of blasting or hydraulic fracturing, improve the reliability of the end caving operation, and thereby prevent transportation accidents caused by disc brake failure.

[0056] The method of using the roof crushing equipment of this embodiment is as follows: the static expansion agent and water are mixed in proportion and stirred evenly in the containing barrel 10 to prepare an expansion agent slurry; the expansion agent slurry is delivered and injected into the inner tube 30 in the borehole by the delivery pump 20; after a period of reaction, the expansion force of the expansion agent slurry injected into the inner tube 30 gradually increases, and continues to grow slowly after reaching a certain expansion force, and the expansion force generated by the hydration reaction of the static expansion agent exerts a force on the rock formation around the borehole to produce pre-induced cracks, and the hard roof will not break and fall at this time. Since the expansion force of the static expansion agent can last for a long time, after the end bracket, the advance bracket or the advance pillar is pushed forward, the hard roof will break and fall along with the cracks generated by the force of the expansion agent slurry to break the roof.

[0057] The process construction process of the roof crushing equipment of this embodiment is as follows: perform drilling construction; fix the feed pipe 50, the reflux cooling pipe 60 and the plug body 40 in the inner tube 30, and insert the inner tube 30 into the borehole; use a stirring paddle to stir the static expansion agent with water to form an expansion agent slurry; connect the connecting structure 70 to the first end of the feed pipe 50 and start the delivery pump 20; inject the expansion agent slurry into the inner tube 30 until the reflux cooling pipe 60 returns to slurry; turn off the delivery pump 20 and the pneumatic motor 80; cut off the first end of the feed pipe 50 and fold it in half; clean the accommodating cavity and the delivery pump 20 and then inject water into the accommodating cavity; connect the connecting structure 70 to the first end of the feed pipe 50 and start the delivery pump 20 to inject water into the reflux cooling pipe 60; close the stop valve 73 after completing the water injection; set a safety sign to prevent personnel from staying under the construction borehole for 24 hours.

[0058] In this embodiment, an air motor 80 and a stirring paddle are used underground to stir the static expansion agent and water. Water is first added according to the ratio of the static expansion agent to water. According to parameters such as the hole depth and the kilograms of the static expansion agent, water is injected to reach the injection height of the corresponding borehole in the accommodating chamber. Then, the corresponding kilograms of static expansion agent are poured into the accommodating chamber. When in use, the static expansion agent is placed in the accommodating chamber through the feed opening 11. Similarly, water is added from the feed opening 11 and stirred quickly.

[0059] In this embodiment, multiple holes are arranged at intervals. The distance between the drilling position and the two sides of the tunnel is S, that is, the distance between the drilling opening and the two sides of the transport tunnel and the return air tunnel of the coal mining face. Combined with the equipment layout of the two tunnels, the model and size of the drilling rig, etc., it is determined that the distance between the drilling hole and the two sides of the tunnel is S = 500mm, and the spacing between the holes in the same row is within 1.0m. Figures 4 to 7 As shown, in the belt conveyor lane, 4 holes are drilled in each row in front of the advance support, including 13 T holes and 11 P holes. Figure 4 and Fig. 9 As shown, 5 holes are drilled in each row in front of the advance support in the return airway, 14 T holes are arranged from the coal pillar, the hole spacing is 1m, and there are 11 P holes. The specific spacing can be fine-tuned according to the arrangement of anchor rods and anchor cables during construction.

[0060] In this embodiment, the elevation angle and deflection angle of the borehole are determined as follows: the elevation angle α of the borehole refers to the angle between the borehole and the horizontal direction in the axial section of the tunnel. The deflection angle β is the angle between the borehole and the horizontal direction in the cross-sectional view of the tunnel. During construction, it is necessary to combine the specific conditions of the two tunnels and the construction conditions of the drilling rig to determine that the elevation angle of the T-type hole in the belt conveyor tunnel is 45° toward the goaf, that is, α=45°. The elevation angle of the P hole is 45° toward the goaf, and the deflection angle is 30° toward the tunnel recovery wall, such as Figure 5 and Fig. 9 The T-type hole of the return air lane has an elevation angle of 45° toward the goaf, the P-type hole has an elevation angle of 45° toward the goaf, and a deflection angle of 15° toward the side of the return lane. Figure 5 and Fig. 9 shown.

[0061] In this embodiment, the determination of the borehole length L and the vertical depth H of the borehole is as follows: the borehole depth needs to penetrate the length of the top coal anchor cable, taking into account the thickness of the immediate roof and the filling degree of the goaf, and the vertical height of the T-type hole in the belt conveyor lane is designed to be 10m and the oblique length is 14m, and the vertical height of the P hole is 10m and the oblique length is 16m. The vertical height of the T-type hole in the return air lane is 10m and the oblique length is 14m. The vertical height of the P hole is 10m and the oblique length is 15m. The spacing between the borehole rows is 8m.

[0062] In this embodiment, the borehole diameter d and the borehole spacing A are determined as follows: according to the requirements of the static expansion agent for the borehole diameter and considering the construction efficiency, the borehole diameter Φ = 75 mm, and the borehole spacing A = 1.0-1.2 m. The belt transport lane is constructed with 4 boreholes per row in front of the advance support, and the return air lane is constructed with 5 boreholes per row in front of the advance support. During construction, the borehole spacing can be fine-tuned according to the arrangement position of the anchor rods and anchor cables.

[0063] In this embodiment, the borehole spacing B is determined as follows: the initial design of the borehole spacing B = 8.0m. Figure 5 and Figure 8 As shown. The row spacing B should be optimized and adjusted according to the on-site implementation results.

[0064] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0067] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A roof crushing device, characterized in that: include: A accommodating barrel (10), wherein the accommodating barrel (10) has an accommodating cavity; A delivery pump (20), the delivery pump (20) comprising a feed port communicating with the accommodating cavity and a discharge port spaced apart from the feed port; An inner cylinder (30) capable of being inserted into a borehole and adapted to the cross section of the borehole, the inner cylinder (30) having an insertion end and a grouting end; A plug body (40) is arranged at the grouting end; A feed pipe (50), the feed pipe (50) is passed through the plug body (40), a first end of the feed pipe (50) can be communicated with the discharge port, and a second end of the feed pipe (50) extends into the inner cylinder (30); A reflux cooling pipe (60), wherein the reflux cooling pipe (60) is passed through the plug body (40) and is located on one side of the feed pipe (50), wherein a first end of the reflux cooling pipe (60) is located outside the plug body (40), and a second end of the reflux cooling pipe (60) extends into the inner tube (30).

2. The roof crushing device according to claim 1, characterized in that: The top plate crushing device also includes a connecting structure (70), a first end of which is connected to the discharge port, and a second end of which is selectively detachably connected to the first end of the feed pipe (50) and the first end of the reflux cooling pipe (60), and the connecting structure (70) has a filling feed state connected to the first end of the feed pipe (50) and a cooling water inlet state connected to the first end of the reflux cooling pipe (60).

3. The roof crushing device according to claim 2, characterized in that: The connection structure (70) comprises a connection pipe (71), a quick connector (72) arranged at a first end of the connection pipe (71), and a stop valve (73) arranged on the connection pipe (71); the second end of the connection pipe (71) is connected to the discharge port; the quick connector (72) is detachably connected to the first end of the feed pipe (50) and the first end of the reflux cooling pipe (60).

4. The roof crushing device according to claim 1, characterized in that: A material passing opening (31) is provided on the end wall of the insertion end.

5. The roof crushing device according to claim 1, characterized in that: The second end of the reflux cooling pipe (60) protrudes from the second end of the feed pipe (50).

6. The roof crushing device according to claim 1, characterized in that: The top plate crushing device also includes an air motor (80) and a stirring paddle connected to the rotating shaft of the air motor (80), and the stirring paddle extends into the accommodating chamber.

7. The roof crushing device according to claim 6, characterized in that: The stirring paddle comprises a rotating rod (91) connected to the rotating shaft of the pneumatic motor (80), and a first blade group (92) and a second blade group (93) arranged on the rotating rod (91), wherein the first blade group (92) and the second blade group (93) are arranged at intervals along the axial direction of the rotating rod (91).

8. The roof crushing device according to claim 1, characterized in that: The containing barrel (10) has an upwardly disposed feed opening (11), the feed opening (11) being communicated with the containing chamber, the top plate crushing device further comprising a mounting plate disposed on the containing barrel (10), the mounting plate being connected to the side walls of the containing barrel (10) on opposite sides thereof at the feed opening (11), and the conveying pump (20) being disposed on the mounting plate.

9. The roof crushing device according to claim 8, characterized in that: The mounting plate comprises a first plate body (121) and a second plate body (122) connected to the first plate body (121), one end of the first plate body (121) and one end of the second plate body (122) are respectively connected to the side walls of the containing barrel (10) at two opposite sides of the feed opening (11), the delivery pump (20) is arranged on the first plate body (121), and the area of ​​the first plate body (121) is larger than the area of ​​the second plate body (122); and / or, The suction pipe (21) of the delivery pump (20) passes through the mounting plate and extends into the accommodating cavity, and the feed port is arranged at one end of the suction pipe (21).

10. The roof crushing device according to claim 1, characterized in that: The containing barrel (10) is provided with a discharge pipe (13), and the discharge pipe (13) is arranged at the bottom of the containing barrel (10) and is in communication with the containing cavity.

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