Multi-drift goaf continuous filling device and method

Abstract

The invention relates to the technical field of mineral mining, in particular to a multi-drift goaf continuous filling device which comprises a main road pipe. An inlet of the three-way pipe is communicated with the main pipe, and two outlets of the three-way pipe are respectively communicated with the two branch pipes; the control valve is arranged on a pipeline where the two outlets of the three-way pipe are located and used for controlling communication between the inlet of the three-way pipe and the two outlets; the distance between the control valve and the pipeline where the inlet of the three-way pipe is located is not larger than 5 cm. The invention further relates to a using method which comprises the following steps: S1, in a filling roadway in a panel, connecting a filling main pipeline with a branch pipeline of a drift through the multi-drift goaf continuous filling device; and S2, then the control valve, located on the left side, of the multi-drift goaf continuous filling device is opened, the other control valves are all in a closed state, and left drift filling operation is started. According to the scheme, the problem of valve blockage is solved.

Description

Technical Field

[0001] The invention relates to the technical field of mineral mining, and in particular to a device and method for continuously filling a multi-access goaf. Background Art

[0002] In the filling mining method, the filling efficiency is an important factor affecting the ore recovery efficiency. Especially in the approach filling mining method, when one approach is completed and filled, the mining of the adjacent approach can be carried out. Therefore, the approach filling efficiency is a key factor affecting the approach recovery. Compared with the subsequent filling of other empty fields, the approach filling has a smaller filling volume at a time, generally 200m3~400m3, which leads to frequent pipe inversion operations after filling one approach, and no longer needs to be used for pipe washing water and drainage water to clean the pipeline, and continuous filling of multiple approaches can be achieved. Thereby improving the filling efficiency and reducing the cost and labor intensity of filling personnel; at the same time, the continuous filling operation improves the filling quality, ensures the safety of recovery, and solves the technical problems of low filling efficiency, high labor intensity of personnel, and poor filling quality caused by discontinuous filling in conventional approach filling.

[0003] The existing access filling process is as follows: first, the main filling pipeline is laid near the mining area, then connected to the access branch pipeline, and then the surface filling slurry is transported to the access pipeline through the pipeline for filling. After one access is filled, the connection between the main pipeline and the branch pipeline is manually removed, and then the main pipeline is manually connected to the next access branch pipeline by reversing the pipe, and then the next access is started to be filled, and the access filling of the entire panel is completed in this cycle.

[0004] With the existing technology, it takes 2-4 hours to fill an access road, and it takes 2-5 hours to reverse a pipeline, resulting in an access road filling efficiency of less than 50%, which seriously affects the access road filling efficiency, and then affects the access road recovery efficiency. At the same time, after completing the filling of an access road, the pipe is reversed manually to the next access road for filling. This work requires about 3-5 people to work at the same time, and the work is labor-intensive. In addition, after the filling of an access road is completed, the pipe must be cleaned with pipe washing water. A large amount of water for cleaning the pipe will enter the filling access road through the pipe. After the pipe is reversed, a large amount of drainage water is also required to enter the next filling access road mining site through the pipe. A large amount of pipe washing water and drainage water entering the filling mining site will cause the filling concentration to decrease, thereby affecting the filling quality and bringing certain safety hazards.

[0005] In order to improve the filling efficiency and reduce the labor intensity of personnel, related enterprises have also adopted the reverse pipe operation through valve control. That is, a distribution valve is installed between the main pipeline and the branch pipeline, and the flow direction of the filling slurry is controlled by the valve switch to achieve continuous filling. However, the concentration of the filling slurry is high. After about 1 hour of filling, the slurry will be blocked and hardened at the connection between the closed end valve and the pipeline. When filling the left inlet, the left valve needs to be opened and the right valve needs to be closed. The filling slurry is transported to the left inlet through the main pipeline through the left valve for filling. Due to the structural characteristics of conventional valves, the distance between the connection between the valve body and the pipeline and the connection between the valve and the tee is too long (generally more than 10cm), which results in the accumulation of high-concentration filling slurry at the connection between the valve body and the pipeline and the connection between the valve and the tee when the right valve is closed. After a long time, the accumulated filling slurry will harden, resulting in the inability to open the right valve when the filling of the left inlet is completed, thus causing the occurrence of filling pipe blockage accidents.

[0006] With the above technology, it takes 2-4 hours to fill one access road, and 2-5 hours to reverse a pipeline, resulting in an access road filling efficiency of less than 50%, which seriously affects the access road filling efficiency, and then affects the access road recovery efficiency. At the same time, after completing the filling of one access road, the pipe is reversed manually to the next access road for filling. This work requires about 3-5 people to work at the same time, and the work is labor-intensive. In addition, after the filling of one access road is completed, the pipe washing water is required to clean the pipe. A large amount of water for cleaning the pipe will enter the filling access road through the pipe. After the pipe is reversed, a large amount of drainage water is also required to enter the next filling access road mining site through the pipe. A large amount of pipe washing water and drainage water entering the filling mining site will cause the filling concentration to decrease, thereby affecting the filling quality and bringing certain safety hazards. In addition, since the distance between the valve body and the pipe connection and the valve and the tee connection is too long (generally more than 10 cm), when one side of the valve is opened and the other side of the valve is closed for filling, after a long time, the filling material in the area between the tee connection and the first closed valve may harden, resulting in the valve being unable to be opened, which may easily cause a safety accident. A technology is now needed to solve the problem of valve blockage. Summary of the invention

[0007] The invention provides a multi-path goaf continuous filling device and method, which can solve the problem of valve blockage.

[0008] In order to solve the above technical problems, this application provides the following technical solutions: A multi-entry goaf continuous filling device, comprising: Main road pipe; Two branch pipes: symmetrically arranged on both sides of the main pipe; Tee pipe: The inlet of the tee pipe is connected to the main pipe, and the two outlets of the tee pipe are connected to the two branch pipes respectively; Control valve: It is set on the pipes where the two outlets of the tee are located, and is used to control the connection between the inlet of the tee and the two outlets; The distance between the control valve and the pipeline where the inlet of the tee pipe is located does not exceed 5 cm.

[0009] The basic principle of this scheme is that the filler coming from the main pipe flows through the tee pipe to the two branch pipes, and the filling inlet extending from the two branch pipes is filled with filler; two control valves are set to limit the connection between the two branch pipes and the main pipe. When it is necessary to fill the inlet to be filled on one side, the control valve on the corresponding branch is opened to add filler to it. When the control valve on one side is opened, the control valve on the other side is closed; the position of the control valve is limited so that the distance between the control valve and the pipe where the entrance of the tee pipe is located does not exceed 5cm, to prevent the filler from hardening at the control valve where the branch pipe on the other side is located when filling the area to be filled where the branch pipe on one side is located, causing blockage. The distance between the valve bodies of the two control valves is small, and no matter which direction the slurry flows, a vortex will be formed due to the impact force of the slurry, so that there will be no blockage and hardening problems in a short distance.

[0010] This solution can achieve continuous and efficient filling of multiple routes, reduce the labor intensity of personnel, improve the filling quality, and save filling costs. Compared with the existing technology, this method does not need to perform pipe reversal operations after completing the filling of one route, and no longer needs to use pipe washing water and drainage water to clean the pipeline, which can achieve continuous filling of multiple routes. Thereby improving the filling efficiency and reducing the cost and labor intensity of filling personnel; at the same time, the continuous filling operation improves the filling quality, ensures the safety of mining, and solves the technical problems of low filling efficiency, high labor intensity of personnel, and poor filling quality caused by discontinuous filling in conventional route filling.

[0011] Furthermore, the control valve includes a valve body and a valve core, a material passing hole is opened in the valve body, the material passing hole is used to connect the outlet and the inlet of the three-way pipe, the valve body is opened with a sliding groove in the vertical direction, the valve core is slidably connected to the sliding groove, when the valve core slides downward to the lower dead point, the material passing hole is blocked; when the valve core slides upward to the upper dead point, the material passing hole is opened.

[0012] Furthermore, the angle between the two control valves is adjustable.

[0013] Beneficial effect: It can be adjusted according to the actual needs of the site, so as to facilitate the connection of branch pipelines.

[0014] Furthermore, the main pipe and the branch pipe are respectively connected to the three-way pipe through pipe connection quick connectors.

[0015] Beneficial effects: convenient for disassembly and installation.

[0016] A method for using a multi-entry goaf continuous filling device comprises the following steps: S1: In the filling lane in the panel area, the main filling pipeline and the branch pipeline of the access route are connected through a multi-access goaf continuous filling device; S2: Then, a control valve on the left side of a multi-inlet gob continuous filling device is opened, and the other control valves are all in a closed state, and the filling operation of the left inlet is started; S3: After the filling of the left side inlet is completed, close the left side control valve, open the right side control valve, and fill the right side inlet.

[0017] Furthermore, there are four inlets to be filled: the first filling inlet, the second filling inlet, the third filling inlet and the fourth filling inlet, and the four filling inlets are arranged in a field shape; a control valve of a multi-inlet goaf continuous filling device is divided into a left control valve and a right control valve, two multi-inlet goaf continuous filling devices are arranged between the first filling inlet and the second filling inlet, namely the first distributor and the second distributor, and a fourth distributor is arranged between the third filling inlet and the third filling inlet; The main line is connected to the three-way pipe inlet of the first distributor; the left control valve of the first distributor is connected to the branch pipe of the first filling inlet; the right control valve of the first distributor is connected to the three-way pipe inlet of the second distributor, the left control valve of the second distributor is connected to the three-way pipe inlet of the third distributor, and the right control valve of the second distributor is connected to the branch pipe of the second filling inlet; the left control valve of the third distributor is connected to the branch pipe of the third filling inlet; the right control valve of the third distributor is connected to the branch pipe of the fourth filling inlet.

[0018] Furthermore, the order of the routes to be filled is to fill in from the first filling route, the second filling route, the third filling route and the fourth filling route in turn. When filling the first filling route, only the left control valve of the first distributor is opened; when filling the second filling route, only the right control valve of the second distributor and the right control valve of the first distributor are opened; when filling the third filling route, only the right control valve of the first distributor, the left control valve of the second distributor and the left control valve of the third distributor are opened; when filling the fourth filling route, only the right control valve of the first distributor, the left control valve of the second distributor and the right control valve of the third distributor are opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a multi-entry goaf continuous filling device; Figure 2 It is a schematic diagram of the layout of a multi-entry goaf continuous filling device when in use; Figure 3 It is the structural schematic diagram of the control valve; Figure 4 This is a schematic diagram of the structure between the dredging chamber and the control valve of Example 3; Figure 5 It is a schematic diagram of the position between the dredging chamber, the refrigeration device and the heating pipe in Example 4. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods: The marks in the drawings in the specification include: a first filling inlet 3, a second filling inlet 401, a third filling inlet 402, a fourth filling inlet 403, a main pipe 6, a branch pipe 17, a pipe connection quick connector 18, a first distributor 81, a second distributor 82, a third distributor 83, a left control valve 161, a right control valve 162, a distributor internal connecting pipe 163, an internal pipe distribution angle 164, a clearing chamber 165, ice cubes 166, a heating pipe 167, a first cold pipe 168, a second cold pipe 169, a valve body 91, a valve core 92, and a material passage hole 93.

[0021] Embodiment 1 is as attached Figure 1 As shown, A multi-entry goaf continuous filling device, characterized by comprising: Main pipe 6; Two branch pipes 17: symmetrically arranged on both sides of the main pipe 6; Tee pipe: the inlet of the tee pipe is connected to the main pipe 6, and the two outlets of the tee pipe are connected to the two branch pipes 17 respectively; Control valve: It is set on the pipes where the two outlets of the tee are located, and is used to control the connection between the inlet of the tee and the two outlets; The distance between the control valve and the pipeline where the inlet of the tee pipe is located does not exceed 5 cm.

[0022] As attached Figure 3 As shown, the control valve includes a valve body 91 and a valve core 92. A material through hole 93 is opened in the valve body 91. The material through hole 93 is used to connect the outlet and the inlet of the three-way pipe. The valve body 91 is opened with a sliding groove in the vertical direction. The valve core 92 is slidably connected to the sliding groove. When the valve core 92 slides downward to the lower dead point, the material through hole 93 is blocked; when the valve core 92 slides upward to the upper dead point, the material through hole 93 is opened.

[0023] First, the control valve uses a blind plate and a connecting hole on a steel plate as the valve core, which can realize vertical switching to achieve opening and closing operations. In addition, the valve body and the valve core are tightly connected without excessive connection dimensions, so that the distance between the valve body and the valve core and the internal connection pipeline of the distributor does not exceed 5cm, thereby solving the problem of slurry blockage and hardening.

[0024] The angle between the two control valves is adjustable. That is, the pipes at the inlet of the three-way pipe and the two outlets are all flexible pipes. During use, multiple multi-inlet gob area continuous filling devices are used in conjunction, which is called a distributor, which is dedicated to distributing filling materials to each filling inlet. The internal connecting pipe 163 of the distributor is a flexible pipe on the three-way pipe, which can be bent to achieve angle changes.

[0025] The main pipe 6 and the branch pipe 17 are respectively connected to the three-way pipe through a pipe connection quick connector 18.

[0026] A method for using a multi-entry goaf continuous filling device, using the device as a distributor to fill multiple filling entry routes with filling materials, characterized in that it includes the following steps: S1: In the filling lane in the panel area, the main filling pipeline and the branch pipeline of the access route are connected through a multi-access goaf continuous filling device; S2: Then, a control valve on the left side of a multi-inlet gob continuous filling device is opened, and the other control valves are all in a closed state, and the filling operation of the left inlet is started; S3: After the filling of the left side inlet is completed, close the left side control valve, open the right side control valve, and fill the right side inlet.

[0027] As attached Figure 2 As shown, there are four inlets to be filled: the first filling inlet 3, the second filling inlet 401, the third filling inlet 402 and the fourth filling inlet 403, and the four filling inlets are arranged in a field shape; a control valve of a multi-inlet goaf continuous filling device is divided into a left control valve 161 and a right control valve 162, two multi-inlet goaf continuous filling devices are arranged between the first filling inlet 3 and the second filling inlet 401, namely a first distributor 81 and a second distributor 82, and a fourth distributor is arranged between the third filling inlet 402 and the third filling inlet 403; The main line is connected to the three-way pipe inlet of the first distributor 81; the left control valve 161 of the first distributor 81 is connected to the branch pipe 17 of the first filling inlet 3; the right control valve 162 of the first distributor 81 is connected to the three-way pipe inlet of the second distributor 82, the left control valve 161 of the second distributor 82 is connected to the three-way pipe inlet of the third distributor 83, and the right control valve 162 of the second distributor 82 is connected to the branch pipe 17 of the second filling inlet 401; the left control valve 161 of the third distributor 83 is connected to the branch pipe 17 of the third filling inlet 402; the right control valve 162 of the third distributor 83 is connected to the branch pipe 17 of the fourth filling inlet 403.

[0028] The order of the routes to be filled is from the first filling route 3, the second filling route 401, the third filling route 402 and the fourth filling route 403. When filling the first filling route, only the left control valve 161 of the first distributor 81 is opened; when filling the second filling route 401, only the right control valve 162 of the second filler and the right control valve 162 of the first distributor 81 are opened; when filling the third filling route 402, only the right control valve 162 of the first distributor 81, the left control valve 161 of the second distributor 82 and the left control valve 161 of the third distributor 83 are opened; when filling the fourth filling route 403, only the right control valve 162 of the first distributor 81, the left control valve 161 of the second distributor 82 and the right control valve 162 of the third distributor 83 are opened.

[0029] The example of this scheme is as follows: the annual production capacity of a copper-nickel mine is 1 million tons. It is mined by the downward approach filling mining method. The filling system has a production capacity of 100m3 / h, and its filling process is tailings + coarse aggregate paste filling. Before the mine adopted the method of the present invention, it could fill 600m3 per day (two shifts). After adopting the method of the present invention, it can fill about 1200m3 per day (two shifts), and the filling efficiency is doubled. In addition, the drainage and pipe washing water volume is reduced by more than 100m3 per day, and the filling quality is improved, ensuring the safety of further recovery. At the same time, the number of underground workers per shift is reduced by 2, which not only reduces the labor intensity of the personnel, but also saves the filling cost.

[0030] The invention provides a device and method for continuously filling goafs in multi-access mining, which has the following advantages: 1) The method of the present invention does not require pipe reversal after one inlet is filled, and continuous filling of 2 to 4 inlets can be achieved. The filling volume per time is increased from the original 200m3 to 400m3 to 1000m3 to 1600m3, which greatly improves the filling operation efficiency.

[0031] 2) The method of the present invention no longer requires pipe washing water and drainage water for pipe cleaning, and can achieve continuous filling of multiple routes, reducing the amount of drainage and pipe washing water by more than 100m3 per day, and improving the filling quality, ensuring the safety of further recovery.

[0032] 3) The method of the present invention reduces the number of underground workers per shift by 2, which not only reduces the labor intensity of the workers, but also saves the filling cost.

[0033] Embodiment 2 The difference between the second embodiment and the first embodiment is that: Figure 4As shown, a dredging chamber is provided between the internal connecting pipe 163 of the distributor and the left control valve 161 and the right control valve 162 respectively. The inlet of the dredging chamber is connected to the internal connecting pipe 163 of the distributor, and the outlet is connected to the inlet of the adjacent control valve (that is, a dredging chamber is provided beside each of the left and right control valves 162). A cleaning door is provided on the dredging chamber. Before one of the left / right control valves 162 is started, the cleaning door of the dredging chamber beside the other control valve is opened, and special ice cubes are placed in the dredging chamber. The shape of the ice cubes is a bucket shape, and the opening faces the internal connecting pipe 163 of the distributor. The filling liquid is cement mortar. Before filling the first filling inlet 3 with cement mortar, the ice cubes are first placed in the dredging chamber beside the right control valve 162 of the first distributor 81. When the first filling inlet 3 is filled with mortar, the mortar will flow along the distributor. The internal connecting pipe 163 of the distributor enters the opened left control valve 161 until it enters the first filling inlet 3 to fill it; for the solution of embodiment 1, although shortening the distance between the internal connecting pipe 163 of the distributor and the valve can avoid the mortar from hardening next to the unopened valve to a certain extent, it is inevitable that during the filling process, the mortar will still come into direct contact with the unopened valve, and the long-term residence increases the risk of hardening, which can easily cause the valve to be blocked and difficult to open. This solution buffers the hardening of the mortar by setting up a dredging chamber, and low-temperature ice cubes will delay the hardening of the mortar (under low temperature conditions, the hydration reaction rate of cement will be greatly reduced. Cement hydration is the key process of mortar hardening. The slowdown in the hydration rate directly leads to a longer time for the mortar to coagulate and harden, resulting in early non-coagulation and lack of strength). At the same time, the bucket shape of the ice cube can load the mortar inside the ice cube, reducing the probability of direct contact between the cement mortar and the control valve, and delaying the hardening time of the mortar next to the unopened valve, reducing the probability of the valve being blocked. Even if the mortar in the ice cube hardens, the ice cube will prevent it from directly contacting the valve or the inner wall of the dredging chamber. When the valve on this side is opened later, it can be discharged into the filling inlet of the newly opened valve (for example, after the first filling inlet 3 is filled, the right control valve 162 of the first distributor 81 is opened, and the left control valve 161 is closed). The ice cube will melt in the dredging chamber, and the melted water will act as a lubricant, staying between the inner wall of the dredging chamber and the ice cube, helping the sliding of the ice cube after the valve is opened later. It is convenient and faster to push the ice cube and the mortar in it to the next filling inlet to prevent blockage.

[0034] Embodiment three: The difference between the third embodiment and the second embodiment is that a refrigeration device and a heating pipe are installed on the inner wall of the dredging chamber 165, a water adding hole is also arranged on the outer wall of the dredging chamber 165, and the dredging chamber 165 is inclined relative to the internal connecting pipe 163 of the distributor; Figure 4As shown, when the left control valve 161 is opened, the right control valve 162 is closed. Before filling, the water adding hole of the dredging chamber 165 beside the right control valve 162 is opened, and water is added to the dredging chamber 165. The water cannot overflow the contact position with the internal connecting pipe 163 of the distributor. Then the refrigeration device is started to cool and freeze the dredging chamber 165 to form ice blocks 166 in the dredging chamber 165, avoiding the trouble of adding ice blocks 166 manually. The inclined setting of the dredging chamber 165 facilitates the rapid flow of the filling agent. At the same time, before freezing, water will also fill the dredging chamber 165. After freezing, most of the dredging chamber 165 will be covered with ice. Even if there is a partial gap near the internal connecting pipe 163 of the distributor, this part is directly in contact with the filling agent during the later filling to prevent the filling agent from hardening and blocking the valve. And through the setting of the heating pipe, when the ice block 166 is not melted in time, it can also be heated to accelerate the dissolution of the ice block 166.

[0035] The difference between the fourth embodiment and the third embodiment is that: Figure 5 As shown, the refrigeration device includes a first cold pipe 168 and a second cold pipe 169, the first cold pipe 168 alternately surrounds the dredging chamber 165, the second cold pipe 169 is arranged in the middle of the dredging chamber 165, and both ends are connected to the first cold pipe 168, the first cold pipe 168 and the second cold pipe 169 are used to pass the refrigerant to cool the dredging chamber 165, the heating pipe 167 is arranged between two adjacent first cold pipes 168 / second cold pipes 169 or one first cold pipe 168 and one second cold pipe 169, and there is a gap between the adjacent first cold pipes 168 and heating pipes 167; the second cold pipe 169 is made of a material with a better thermal conductivity than the first cold pipe 168. No water adding hole is set on the dredging chamber 165.

[0036] When the left control valve 161 is opened and the right control valve 162 is closed, the filling mortar flows to one end of the left control valve 161 and simultaneously fills the dredging chamber 165 in front of the right control valve 162. At this time, the refrigeration device on the dredging chamber 165 next to the right control valve 162 is turned on, and the refrigerant flows in the first cold pipe 168 and the second cold pipe 169 to cool down the dredging chamber 165. During the cooling process, since the first cold pipe 168 and the second cold pipe 169 are arranged at intervals and there are intervals between adjacent ones, the dredging chamber 165 has the best cooling effect near the first cold pipe 168 and the second cold pipe 169, and the cooling effect at the second cold pipe 169 is better than that at the first cold pipe 168. Then, more water in the cement mortar will freeze at the positions of the first cooling pipe 168 and the second cooling pipe 169. After the filling chamber connected to the left control valve 161 is filled, the mortar in the dredging chamber 165 next to the right control valve 162 stays for too long, and hardening may occur inside. When the ice in the dredging chamber 165 begins to melt after being heated by the heating pipe 167, a cavity will be formed at the original position of the ice (for the area where the mortar has hardened, since the outer side of the mortar is close to the inner wall of the dredging chamber 165, the hardening efficiency will be reduced when the refrigeration device is cooled. This solution is aimed at the hardening of the mortar inside), that is, multiple weak points will be generated, which will break into multiple hard blocks under the impact force during the later filling, thereby preventing the formation of an integral hard block in the middle of the cement mortar in the dredging chamber 165, thereby reducing the possibility of an integral hard block clogging the valve.

[0037] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A multi-entry goaf continuous filling device, characterized in that: include: Main road pipe; Two branch pipes: symmetrically arranged on both sides of the main pipe; Tee pipe: The inlet of the tee pipe is connected to the main pipe, and the two outlets of the tee pipe are connected to the two branch pipes respectively; Control valve: It is set on the pipes where the two outlets of the tee are located, and is used to control the connection between the inlet of the tee and the two outlets; The distance between the control valve and the pipeline where the inlet of the tee pipe is located does not exceed 5 cm.

2. A multi-entry goaf continuous filling device according to claim 1, characterized in that: The control valve includes a valve body and a valve core. A material passing hole is opened in the valve body. The material passing hole is used to connect the outlet and the inlet of the three-way pipe. A sliding groove is opened in the valve body in the vertical direction. The valve core is slidably connected to the sliding groove. When the valve core slides downward to the lower dead point, the material passing hole is blocked; when the valve core slides upward to the upper dead point, the material passing hole is opened.

3. The multi-entry goaf continuous filling device according to claim 1 is characterized in that: The angle between the two control valves is adjustable.

4. A multi-entry goaf continuous filling device according to claim 3, characterized in that: The main pipe and the branch pipe are respectively connected to the three-way pipe through pipe connection quick connectors.

5. A method for using a multi-access goaf continuous filling device, using the multi-access goaf continuous filling device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: In the filling lane in the panel area, the main filling pipeline and the branch pipeline of the access route are connected through a multi-access goaf continuous filling device; S2: Then, a control valve on the left side of a multi-inlet gob continuous filling device is opened, and the other control valves are kept in a closed state, and the filling operation of the left inlet is started; S3: After the filling of the left side inlet is completed, close the left side control valve, open the right side control valve, and fill the right side inlet.

6. The method for using the multi-entry goaf continuous filling device according to claim 5 is characterized in that: There are four inlets to be filled: the first filling inlet, the second filling inlet, the third filling inlet and the fourth filling inlet, and the four filling inlets are arranged in a field shape; a control valve of a multi-inlet goaf continuous filling device is divided into a left control valve and a right control valve, two multi-inlet goaf continuous filling devices are arranged between the first filling inlet and the second filling inlet, namely a first distributor and a second distributor, and a fourth distributor is arranged between the third filling inlet and the third filling inlet; The main line is connected to the three-way pipe inlet of the first distributor; the left control valve of the first distributor is connected to the branch pipe of the first filling inlet; the right control valve of the first distributor is connected to the three-way pipe inlet of the second distributor, the left control valve of the second distributor is connected to the three-way pipe inlet of the third distributor, and the right control valve of the second distributor is connected to the branch pipe of the second filling inlet; the left control valve of the third distributor is connected to the branch pipe of the third filling inlet; the right control valve of the third distributor is connected to the branch pipe of the fourth filling inlet.

7. The method for using the multi-entry goaf continuous filling device according to claim 6 is characterized by: The order of the routes to be filled is from the first filling route, the second filling route, the third filling route and the fourth filling route in turn. When filling the first filling route, only the left control valve of the first distributor is opened; when filling the second filling route, only the right control valve of the second distributor and the right control valve of the first distributor are opened; when filling the third filling route, only the right control valve of the first distributor, the left control valve of the second distributor and the left control valve of the third distributor are opened; when filling the fourth filling route, only the right control valve of the first distributor, the left control valve of the second distributor and the right control valve of the third distributor are opened.

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