Hydraulic telescopic support for backfilling continuous mining and its working method

Abstract

The present application belongs to the technical field of coal mine filling mining, and particularly relates to a hydraulic telescopic support for back-filling continuous coal mining and a working method thereof. The hydraulic telescopic support comprises a main base and a main roof beam. The front end and the rear end of the main base are telescopically provided with a front base and a rear base. The front end and the rear end of the main roof beam are telescopically provided with a front roof beam and a rear roof beam. In the working method, the combined hydraulic telescopic support cluster is used to replace the traditional filling support. In the filling and filling body maintenance stages, the tail beam maintains a vertical state, the rear roof beam maintains the position unchanged, the coal mining machine is synchronously pushed and mined during the filling process, the front roof beam and the front base are gradually extended outward, the main roof beam and the main base are gradually moved forward, the new empty roof area is supported, the separation of the coal mining and the filling operation is realized by means of the extended front and rear roof beams and the front and rear bases, and the productivity of the back-filling fully-mechanized coal mining face is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal mine filling mining, and particularly relates to a hydraulic telescopic support for back-filling continuous coal mining and a working method thereof. BACKGROUND

[0002] Filling mining is an important green mining technology, and its advantages include surface subsidence reduction, large-scale disposal of general industrial solid waste, aquifer protection, recovery of coal resources and coal column resources under three overburden layers, etc., and it belongs to a national key encouraged coal mining method. The filling mining method can be divided into solid filling, super-high water filling and paste filling. Among them, the paste filling has the comprehensive advantages of low filling cost and large filling capacity compared with the solid filling and the super-high water filling. In particular, the cemented paste filling mining overburden layer mainly uses slow subsidence zone, and basically does not appear caving zone and fissure zone, and has the best overall control effect on the overburden layer.

[0003] The paste filling is divided into longwall working face back-filling and strip-type roadway continuous mining and filling in process. At present, the strip-type roadway continuous mining and filling is generally used in the filling mining mine, which has a poor working environment, small coal mining capacity and poor coal mining efficiency. Although the longwall working face back-filling mining technology is a comprehensive mechanized coal mining with high coal mining efficiency, the existing filling support cannot continuously support the newly formed empty roof area in the filling and filling body maintenance stage, and thus the coal mining machine cannot continuously mine, that is, the filling and mining operations cannot be separated, which leads to low yield of a single mining face and does not match the expensive equipment investment of the longwall back-filling fully mechanized working face. Therefore, at present, it is urgent to break through the problem that the filling and mining operations are restricted in the longwall working face back-filling mining technology. SUMMARY

[0004] In order to solve the above problems, the application adopts the following technical scheme: in the first aspect, the application provides a hydraulic telescopic support for back-filling continuous coal mining. The front end and the rear end of the main base are respectively provided with a front base and a rear base. The main base is connected with the front base and the rear base through base hydraulic cylinders. The front end and the rear end of the main roof beam are respectively provided with a front roof beam and a rear roof beam. The main roof beam is connected with the front roof beam and the rear roof beam through roof beam hydraulic cylinders. The front base and the front roof beam, the main base and the main roof beam, and the rear base and the rear roof beam are respectively connected with hydraulic columns. The main base and the main roof beam are connected with a hinged shield beam.

[0005] Further, the two sides of the main roof beam are provided with guide grooves. The front roof beam and the rear roof beam are expanded and contracted to slide in the guide grooves through the roof beam hydraulic cylinders.

[0006] Further, the main base is H-shaped, the front base and the rear base are E-shaped matching with the main base, the front base and the rear base are separated from and combined with the main base through the extension and contraction of the base hydraulic oil cylinder, and the front base and the rear base are combined with the main base to form a cuboid when the base hydraulic oil cylinder is contracted.

[0007] Further, the rear end of the rear roof beam is hingedly connected with a tail beam, the middle part of the tail beam is connected with the bottom of the rear roof beam through a tail beam hydraulic oil cylinder, the rear end of the rear base is vertically provided with a rear base baffle, the tail beam is rotated by controlling the contraction and extension of the tail beam hydraulic oil cylinder, and the tail beam is tightly attached to the rear base baffle when the tail beam is rotated to the vertical state.

[0008] Further, the front end of the front roof beam is hingedly connected with a support plate, the middle part of the support plate is connected with the bottom of the front roof beam through a support plate hydraulic oil cylinder, and the support plate is rotated by controlling the contraction and extension of the support plate hydraulic oil cylinder.

[0009] Further, the hydraulic telescopic supports are arranged side by side to form a hydraulic telescopic support cluster, the front end of the front roof beam of the first row of hydraulic telescopic supports is hingedly connected with a support plate, the rear end of the rear roof beam of the last row of hydraulic telescopic supports is hingedly connected with a tail beam, the rear end of the rear base is vertically provided with a rear base baffle, and the adjacent front and rear rows of hydraulic telescopic supports are connected through hydraulic oil cylinders.

[0010] Further, the rear part of the tail beam is provided with a slurry baffle through a slurry baffle hydraulic oil cylinder, the slurry baffle is synchronously upwardly supported to maintain the sealing of the filling space when the tail beam is lowered through the slurry baffle hydraulic oil cylinder, and the slurry baffle is synchronously retracted downwardly when the tail beam is lowered through the slurry baffle hydraulic oil cylinder.

[0011] In the second aspect, the application provides a working method of the hydraulic telescopic support applied to the continuous mining of the rear filling of the frame, the first row of hydraulic telescopic supports is connected to the scraper of the coal cutting and transporting mechanism through the hydraulic oil cylinder, the support plate is rotated to the vertical state, and the method specifically comprises the following steps.

[0012] Step 1): building a filling space before filling, when the coal cutter of the coal cutting and transporting mechanism pushes and cuts for a certain distance, the front roof beam, the rear roof beam, the front base and the rear base of all the hydraulic telescopic supports in the cluster are gradually and completely contracted and synchronously move to the coal wall of the working face, when the distance between the rear base baffle of the last row of hydraulic telescopic supports and the rear coal wall reaches the designed filling step, the tail beam is rotated to the vertical state to build the filling space with the rear base baffle.

[0013] Step 2): filling and filling body maintenance process, before the filling body is maintained to the design strength, the rear top beam and the rear base of the last row of hydraulic telescopic supports remain unchanged, the tail beam remains vertical state and the filling space built with the rear base baffle remains unchanged, the coal mining machine is pushed and mined synchronously during the filling process, the hydraulic telescopic support cluster moves cooperatively with the scraper, the front top beam and the front base of the hydraulic telescopic support gradually extend, the main top beam and the main base of the hydraulic telescopic support gradually move forward, and the new empty roof area is supported;

[0014] Step 3): after the filling body is maintained to the design strength, the front top beam, the rear top beam, the front base and the rear base of the hydraulic telescopic support are completely retracted, the coal mining machine continuously pushes and mines, the hydraulic telescopic support cluster as a whole moves to the coal wall direction of the working face, and when the coal mining machine pushes and mines for a certain distance, the tail beam is rotated to the horizontal state to shield the roof.

[0015] Further, the rear part of the tail beam of the last row of hydraulic telescopic supports is provided with a baffle plate through a baffle plate hydraulic cylinder, in step 2), the front top beam and the front base of the last row of hydraulic telescopic supports gradually extend, and the main top beam and the main base of the hydraulic telescopic support gradually move forward, in the process, the hydraulic column lowers the tail beam, and the baffle plate hydraulic cylinder controls the baffle plate to rise, so that the gap in the filling space during the lowering of the tail beam is blocked.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] Compared with the existing back support filling technology, the hydraulic telescopic support for the continuous coal mining of the back support filling and the working method thereof of the present application replace the traditional filling support with the hydraulic telescopic support cluster, in the filling and filling body maintenance stage, the tail beam remains in the vertical state, the rear top beam and the rear base remain unchanged, a stable filling space is provided, the coal mining machine is pushed and mined synchronously during the filling process, the front top beam and the front base gradually extend, the main top beam and the main base gradually move forward, and the new empty roof area is supported, the extension type front top beam, rear top beam, front base and rear base are used to realize the separation of the coal mining and the filling operation, and the productivity of the longwall back support filling fully mechanized working face is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings for the specification of the present application are used to provide a further understanding of the present application, the schematic embodiments of the present application and the explanations thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0019] Figure 1 It is a retraction structure schematic view (I) of the hydraulic telescopic support of the present application embodiment one;

[0020] Figure 2 It is a retraction structure schematic view (II) of the hydraulic telescopic support of the present application embodiment one;

[0021] Figure 3 The extension structure diagram of the hydraulic telescopic support of the embodiment one of the present application;

[0022] Figure 4 The operation diagram of the hydraulic telescopic support of the embodiment one of the present application;

[0023] Figure 5 The diagram of the single-row hydraulic telescopic support and the scraper moving cooperatively of the embodiment one of the present application (one);

[0024] Figure 6 The diagram of the single-row hydraulic telescopic support and the scraper moving cooperatively of the embodiment one of the present application (two);

[0025] Figure 7 The diagram of the single-row hydraulic telescopic support and the scraper moving cooperatively of the embodiment one of the present application (three);

[0026] Figure 8 The contraction structure diagram of the last-row hydraulic telescopic support of the embodiment two of the present application;

[0027] Figure 9 The extension structure diagram of the last-row hydraulic telescopic support of the embodiment two of the present application;

[0028] Figure 10 The contraction structure diagram of the first-row hydraulic telescopic support of the embodiment two of the present application;

[0029] Figure 11 The extension structure diagram of the first-row hydraulic telescopic support of the embodiment two of the present application;

[0030] Figure 12 The diagram of the double-row hydraulic telescopic support and the scraper moving cooperatively of the embodiment two of the present application (one);

[0031] Figure 13 The diagram of the double-row hydraulic telescopic support and the scraper moving cooperatively of the embodiment two of the present application (two);

[0032] Figure 14 The diagram of the double-row hydraulic telescopic support and the scraper moving cooperatively of the embodiment two of the present application (three);

[0033] Figure 15 The extension structure diagram of the middle-row hydraulic telescopic support of the embodiment three of the present application;

[0034] Figure 16 The extension structure diagram of the middle-row hydraulic telescopic support of the embodiment three of the present application.

[0035] The components include: 1. Hydraulic telescopic support; 11. Main top beam; 12. Front top beam; 13. Rear top beam; 14. Main base; 15. Front base; 16. Rear base; 17. Hinged shield beam; 18. Guide groove; 19. Tail beam; 110. Rear base baffle; 111. Side guard plate; 112. Slurry baffle plate; 113. Hydraulic column; 114. Top beam hydraulic cylinder; 115. Base hydraulic cylinder; 116. Tail beam hydraulic cylinder; 117. Side guard plate hydraulic cylinder; 118. Slurry baffle plate hydraulic cylinder; 2. Hydraulic cylinder; 3. Scraper conveyor; 4. Filling space; 5. First row of hydraulic telescopic supports; 6. Last row of hydraulic telescopic supports; 7. Middle row of hydraulic telescopic supports. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Example 1:

[0040] like Figures 1 to 3 As shown, this embodiment provides a hydraulic telescopic support 1 for continuous coal mining with backfilling, including a main base 14 and a main top beam 11. The front end and rear end of the main base 14 are respectively provided with a front base 15 and a rear base 16. The main base 14 is connected to the front base 15 and the rear base 16 through base hydraulic cylinders 115. The front end and rear end of the main top beam 11 are respectively provided with a front top beam 12 and a rear top beam 13. The main top beam 11 is connected to the front top beam 12 and the rear top beam 13 through top beam hydraulic cylinders 114. Hydraulic columns 113 are connected between the front base 15 and the front top beam 12, between the main base 14 and the main top beam 11, and between the rear base 16 and the rear top beam 13. A hinged shield beam 17 is connected between the main base 14 and the main top beam 11.

[0041] Further, the two side edges of the main roof beam 11 are provided with guide grooves 18, and the front roof beam 12 and the rear roof beam 13 are capable of sliding expansion and contraction in the guide grooves 18 through the expansion and contraction of the roof hydraulic oil cylinder 114.

[0042] Further, the main base 14 is H-shaped, the front base 15 and the rear base 16 are E-shaped matching the main base 14, and the front base 15 and the rear base 16 are capable of being separated and combined with the main base 14 through the expansion and contraction of the base hydraulic oil cylinder 115, and the front base 15 and the rear base 16 are combined with the main base 14 to form a cuboid when the base hydraulic oil cylinder 115 connected to the front base 15 and the rear base 16 is contracted.

[0043] In order to improve the support force of the hydraulic telescopic support 1 on the roof, the hydraulic columns 113 between the front base 15 and the front roof beam 12 are distributed on the four corners of the front base 15, the hydraulic columns 113 between the main base 14 and the main roof beam 11 are distributed on the four corners of the main base 14, and the hydraulic columns 113 between the rear base 16 and the rear roof beam 13 are distributed on the four corners of the rear base 16.

[0044] In order to achieve better effect, the front end of the front roof beam 12 is hingedly connected with a guard plate 111, the middle part of the guard plate 111 is connected with the bottom of the front roof beam 12 through a guard plate hydraulic oil cylinder 117, and the guard plate 111 is capable of rotating by controlling the contraction and expansion of the guard plate hydraulic oil cylinder 117.

[0045] In order to provide a sealed filling space 4 and guarantee the filling effect and construction safety, the rear end of the rear roof beam 13 is hingedly connected with a tail beam 19, the middle part of the tail beam 19 is connected with the bottom of the rear roof beam 13 through a tail beam hydraulic oil cylinder 116, and the rear end of the rear base 16 is vertically provided with a rear base baffle 110, the tail beam 19 is capable of rotating by controlling the contraction and expansion of the tail beam hydraulic oil cylinder 116, and the tail beam 19 is tightly attached to the rear base baffle 110 when the tail beam 19 rotates to a vertical state.

[0046] When the hydraulic telescopic support 1 is expanded, in order to avoid the top beam being hindered by the friction with the roof, the hydraulic columns 113 of the hydraulic telescopic support 1 need to be lowered, and thus the tail beam 19 will also be lowered to cause a temporary gap in the filling space 4, in order to block the gap, the rear part of the tail beam 19 is provided with a slurry baffle 112 through a slurry baffle hydraulic oil cylinder 118, the slurry baffle 112 is capable of maintaining the filling space 4 closed by being synchronously upwardly supported when the tail beam 19 is lowered through the slurry baffle hydraulic oil cylinder 118 during the filling and filling body maintenance stage, and the slurry baffle 112 is capable of being synchronously retracted downwardly when the tail beam 19 is raised through the slurry baffle hydraulic oil cylinder 118, thereby facilitating the subsequent rotation of the tail beam 19 to horizontally support the roof.

[0047] As Figures 4-7As shown, the embodiment also provides a working method of the single-row hydraulic telescopic support 1. The hydraulic telescopic support 1 is connected to the scraper 3 of the coal cutting and transporting mechanism through the hydraulic oil cylinder 2, and the guard plate 111 is rotated to the vertical state. The working method specifically comprises the following steps:

[0048] Step 1): Building a filling space before filling. After the coal cutter of the coal cutting and transporting mechanism pushes and mines for a certain distance, the front top beam 12, the rear top beam 13, the front base 15 and the rear base 16 of the hydraulic telescopic support 1 are gradually and completely retracted, and are synchronously moved to the coal wall of the working face. When the distance between the rear base baffle 110 and the rear coal wall reaches the designed filling step distance, the tail beam 19 is rotated to the vertical state to build a filling space with the rear base baffle 110.

[0049] Step 2): During the filling and filling body maintenance process, before the filling body maintenance reaches the designed strength, the rear top beam 13 and the rear base 16 of the hydraulic telescopic support 1 remain unchanged, the tail beam 19 remains unchanged in the vertical state with the filling space 4 built by the rear base baffle 110, and the coal cutter is synchronously pushed and mined during the filling process. The hydraulic telescopic support 1 moves cooperatively with the scraper 3, and specifically comprises the following steps:

[0050] Step 2.1): The hydraulic oil cylinder 2 connected to the hydraulic telescopic support 1 and the scraper 3 is first extended to push the scraper 3 forward, and then the hydraulic column 113 of the hydraulic telescopic support 1 is lowered to avoid contacting the roof. At this time, the baffle hydraulic oil cylinder 118 is controlled to lift the baffle 112 to block the gap in the filling space 4 when the tail beam 19 is lowered, then the hydraulic oil cylinder 2 connected to the scraper 3 is retracted, and the top beam hydraulic oil cylinder 114 between the main top beam 11 and the front top beam 12 and the base hydraulic oil cylinder 115 between the main base 14 and the front base 15 of the hydraulic telescopic support 1 are extended to push the front top beam 12 and the front base 14 to move forward,

[0051] Step 2.2): Then the top beam hydraulic oil cylinder 114 between the main top beam 11 and the front top beam 12 and the base hydraulic oil cylinder 115 between the main base 14 and the front base 15 are retracted, the top beam hydraulic oil cylinder 114 between the main top beam 11 and the rear top beam 13 and the base hydraulic oil cylinder 115 between the main base 14 and the rear base 16 are extended, and the main top beam 11 and the main base 14 are pushed to move forward. The distance that the main top beam 11 and the main base 14 move forward is half of the distance that the front top beam 12 and the front base 14 move forward in the previous step.

[0052] Step 2.3): Repeat steps 2.1) to 2.2) until the distance between the front top beam 12 and the rear top beam 13 reaches the maximum designed value of the hydraulic telescopic support 1. Finally, the hydraulic column 113 of the hydraulic telescopic support 1 is restored to rise to support the empty roof area. The baffle hydraulic oil cylinder 118 is controlled to gradually recover the baffle 112 while the hydraulic column 113 rises.

[0053] Step 3): After the filling material is cured to the design strength, the front top beam 12, rear top beam 13, front base 15 and rear base 16 of the hydraulic telescopic support 1 are completely retracted. As the coal mining machine continues to push, the single row of hydraulic telescopic support clusters moves as a whole towards the coal wall of the working face. When the coal mining machine pushes a certain distance, the tail beam 19 rotates to a horizontal state to protect the roof.

[0054] Example 2:

[0055] like Figures 8 to 11 As shown, this embodiment provides a hydraulic telescopic support for continuous coal mining with backfilling, which consists of two rows of hydraulic telescopic supports 5 and 6 arranged to form a hydraulic telescopic support cluster.

[0056] The first row of hydraulic telescopic supports 5 includes a main base 14 and a main top beam 11. The front and rear ends of the main base 14 are respectively provided with a front base 15 and a rear base 16. The main base 14 is connected to the front base 15 and the rear base 16 via base hydraulic cylinders 115. The front and rear ends of the main top beam 11 are respectively provided with a front top beam 12 and a rear top beam 13. The main top beam 11 is connected to the front top beam 12 and the rear top beam 13 via top beam hydraulic cylinders 114. Hydraulic columns 113 are connected between the front base 15 and the front top beam 12, between the main base 14 and the main top beam 11, and between the rear base 16 and the rear top beam 13. A hinged shield beam 17 is connected between the main base 14 and the main top beam 11.

[0057] For better results, the front end of the front top beam 12 of the first row of hydraulic telescopic brackets 5 is hinged to a side guard plate 111. The middle part of the side guard plate 111 is connected to the bottom of the front top beam 12 by a side guard plate hydraulic cylinder 117. The side guard plate 111 can be rotated by controlling the contraction and extension of the side guard plate hydraulic cylinder 117.

[0058] The last row of hydraulic telescopic supports 6 includes a main base 14 and a main top beam 11. The front end and rear end of the main base 14 are respectively provided with a front base 15 and a rear base 16. The main base 14 is connected to the front base 15 and the rear base 16 through base hydraulic cylinders 115. The front end and rear end of the main top beam 11 are respectively provided with a front top beam 12 and a rear top beam 13. The main top beam 11 is connected to the front top beam 12 and the rear top beam 13 through top beam hydraulic cylinders 114. Hydraulic columns 113 are connected between the front base 15 and the front top beam 12, between the main base 14 and the main top beam 11, and between the rear base 16 and the rear top beam 13. A hinged shield beam 17 is connected between the main base 14 and the main top beam 11.

[0059] In order to provide a sealed filling space 4, guarantee the filling effect and construction safety, the rear end of the rear top beam 13 of the last row of hydraulic telescopic supports 6 is hingedly connected with a tail beam 19, the middle part of the tail beam 19 is connected with the bottom of the rear top beam 13 with a tail beam hydraulic oil cylinder 116, the rear end of the rear base 16 is vertically provided with a rear base baffle 110, the tail beam 19 is rotated by controlling the contraction and expansion of the tail beam hydraulic oil cylinder 116, and when the tail beam 19 is rotated to the vertical state, the tail beam 19 is closely attached to the rear base baffle 110;

[0060] Based on the same effect as example one, the rear part of the tail beam 19 of the last row of hydraulic telescopic supports 6 is provided with a slurry baffle 112 through a slurry baffle hydraulic oil cylinder 118, and in the filling and filling body maintenance stage, the slurry baffle 112 is maintained closed by being synchronously upwardly supported by the slurry baffle hydraulic oil cylinder 118 when the tail beam 19 is lowered, and the slurry baffle 112 is synchronously retracted downwardly by the slurry baffle hydraulic oil cylinder 118 when the tail beam 19 is raised, so as to facilitate the subsequent rotation of the tail beam 19 to the horizontal support top plate.

[0061] As shown in Figures 12-14 The embodiment also provides a working method of the above-mentioned double-row combined hydraulic telescopic support 1, the first row of hydraulic telescopic supports 5 is connected with the scraper 3 of the coal cutting and transporting mechanism through the hydraulic oil cylinder 2, the support plate 111 is rotated to the vertical state, and the method specifically comprises the following steps:

[0062] Step 1): building a filling space before filling, when the coal cutting machine of the coal cutting and transporting mechanism pushes and cuts a certain distance, the front top beam 12, the rear top beam 13, the front base 15 and the rear base 16 of the two rows of supports of the first row of hydraulic telescopic supports 5 and the last row of hydraulic telescopic supports 6 are gradually and completely contracted, and are synchronously moved to the coal wall of the working face, when the distance between the rear base baffle 110 of the last row of hydraulic telescopic supports 5 and the rear coal wall reaches the designed filling step distance, the tail beam 19 is rotated to the vertical state to build the filling space with the rear base baffle 110;

[0063] Step 2): in the filling and filling body maintenance process, before the filling body maintenance reaches the designed strength, the rear top beam 13 and the rear base 16 of the last row of hydraulic telescopic supports 6 remain unchanged, the tail beam 19 remains unchanged in the vertical state to build the filling space with the rear base baffle 110, and the coal cutting machine is synchronously pushed and cut in the filling process, and the two rows of hydraulic telescopic supports 5 and 6 are cooperatively moved with the scraper 3, and the cooperation specifically comprises:

[0064] Step 2.1): the hydraulic cylinder 2 connected with the first row of hydraulic support 5 and the scraper 3 is first extended, the scraper 3 is pushed forward, then the hydraulic column 113 of the first row of hydraulic support 5 is lowered to avoid contacting the roof, then the hydraulic cylinder 2 connected with the scraper 3 is retracted, the hydraulic cylinder 2 connected with the last row of hydraulic support 6 is extended, the first row of hydraulic support 5 is pulled forward, then the hydraulic column 113 of the first row of hydraulic support 5 is raised to support the empty roof area;

[0065] Step 2.2): the hydraulic column 113 of the last row of hydraulic support 6 is lowered to avoid contacting the roof, at this time, the hydraulic cylinder 118 of the baffle plate is controlled to lift the baffle plate 112 to block the gap in the filling space 4 when the tail beam 19 is lowered, the hydraulic cylinder 2 between the last row of hydraulic support 6 and the first row of hydraulic support 5 is retracted, and the hydraulic cylinder 114 between the main roof beam 11 and the front roof beam 12 of the last row of hydraulic support 6 and the hydraulic cylinder 115 between the main base 14 and the front base 15 is extended to push the front roof beam 12 and the front base 15 to move forward,

[0066] Step 2.3): then the hydraulic cylinder 114 between the main roof beam 11 and the front roof beam 12 of the last row of hydraulic support 6 and the hydraulic cylinder 115 between the main base 14 and the front base 15 is retracted, the hydraulic cylinder 114 between the main roof beam 11 and the rear roof beam 13 and the hydraulic cylinder 115 between the main base 14 and the rear base 16 is extended to push the main roof beam 11 and the main base 14 to move forward, the distance of the forward movement of the main roof beam 11 and the main base 14 is half of the forward movement distance of the front roof beam 12 and the front base 15 in the previous step;

[0067] Step 2.4): repeat steps 2.1) to 2.3) until the distance between the front roof beam 12 and the rear roof beam 13 of the last row of hydraulic support 6 is the maximum design value of the hydraulic support 6, the hydraulic column 113 of the last row of hydraulic support 6 is restored to rise to support the empty roof area, and the hydraulic cylinder 118 of the baffle plate is controlled to gradually recover the baffle plate 112 while the hydraulic column 113 is rising.

[0068] Step 2.5): after multiple cutting cycles, the first row of hydraulic support 5 in front of the last row of hydraulic support 6 also realizes the gradual extension of the front roof beam 12 and the front base 15, and the gradual forward movement of the main roof beam 11 and the main base 14 to the maximum design value, supporting the new empty roof area.

[0069] Step 3): After the filling body is cured to the design strength, the front top beam 12 and the rear top beam 13 of the hydraulic telescopic support 5 and 6, the front base 15 and the rear base 16 are completely retracted, the double-row hydraulic telescopic support cluster moves as a whole to the coal wall direction of the working face along with the continuous mining of the coal mining machine, and when the coal mining machine mines for a certain distance, the tail beam 19 is rotated to the horizontal state to shield the roof.

[0070] Embodiment three:

[0071] As shown in Figures 8 to 11 and Figure 15 and Figure 16 The embodiment provides a hydraulic telescopic support for back-filling continuous coal mining, which is formed by a first row of hydraulic telescopic supports 5, a last row of hydraulic telescopic supports 6 and a plurality of middle rows of hydraulic telescopic supports 7 through the arrangement and combination of hydraulic oil cylinders 2.

[0072] The first row of hydraulic telescopic supports 5 and the last row of hydraulic telescopic supports 6 have the same structure as in embodiment two, the middle row of hydraulic telescopic supports 7 comprises a main base 14 and a main top beam 11, the front end and the rear end of the main base 14 are respectively provided with a front base 15 and a rear base 16, the main base 14 is connected with the front base 15 and the rear base 16 through a base hydraulic oil cylinder 115 respectively, the front end and the rear end of the main top beam 11 are respectively provided with a front top beam 12 and a rear top beam 13, the main top beam 11 is connected with the front top beam 12 and the rear top beam 13 through a top beam hydraulic oil cylinder 114 respectively, hydraulic columns 113 are connected between the front base 15 and the front top beam 12, between the main base 14 and the main top beam 11 and between the rear base 16 and the rear top beam 13 respectively, and a hinged shield beam 17 is connected between the main base 14 and the main top beam 11.

[0073] The operation method of the hydraulic telescopic support for back-filling continuous coal mining in the embodiment is basically the same as the method in embodiment two, and the difference lies in that:

[0074] 1. During the cooperative movement of the hydraulic telescopic support cluster and the scraper 3, the hydraulic oil cylinders 2 connected in front of and behind the middle row of hydraulic telescopic supports 7 need to be retracted and extended before step 2.2) is performed, the hydraulic telescopic supports in the rear row are pulled forward in sequence until all the middle row of hydraulic telescopic supports 7 are moved forward, the hydraulic columns 113 of the middle row of hydraulic telescopic supports 7 are lowered before being pulled by the hydraulic oil cylinders 2 as a whole, and are restored to rise after being pulled by the hydraulic oil cylinders 2 to support the empty roof area.

[0075] 2. After a plurality of cutting cycles, the front top beam 12 and the front base 15 of the hydraulic telescopic supports in the hydraulic telescopic support cluster are gradually extended from the rear row to the front row, the main top beam 11 and the main base 14 are gradually moved forward to the maximum design value, and support the new empty roof area.

[0076] The application discloses a hydraulic telescopic support for backfilling continuous coal mining and a working method thereof. The hydraulic telescopic support (cluster) is used to replace the traditional backfilling support. In the filling and filling body maintenance stage, the tail beam 19 keeps vertical state, the back top beam 13 keeps the position unchanged, the coal mining machine is pushed and mined synchronously in the filling process, the front top beam 12 and the front base 15 are gradually extended outward, the main top beam 11 and the main base 14 are gradually moved forward, the new empty top area is supported, the separation of the coal mining and the filling operation is realized by means of the extended front top beam 12, the back top beam 13 and the front base 15 and the back base 16, and the productivity of the long-wall backfilling fully-mechanized coal mining face is greatly improved. The back part of the tail beam 19 is provided with a slurry blocking plate 112. When the tail beam 19 is lowered along with the lowering of the hydraulic column 113 of the hydraulic telescopic support close to the filling space 4, the slurry blocking plate 112 can be controlled to rise, so that the gap in the filling space 4 during the lowering of the tail beam 19 is blocked, and the filling space 4 is fully maintained.

[0077] The above describes the specific embodiments of the application in combination with the drawings, but is not a limitation on the protection scope of the application. It should be understood by those skilled in the art that various modifications or changes made on the basis of the technical solutions of the application without creative labor are still within the protection scope of the application.

Claims

1. A hydraulic telescopic support for backfilling continuous coal mining, comprising a main base and a main roof beam, characterized in that, The front end and the rear end of the main base are respectively provided with a front base and a rear base, the main base is connected with the front base and the rear base through a base hydraulic oil cylinder, the front end and the rear end of the main roof beam are respectively provided with a front roof beam and a rear roof beam, the main roof beam is connected with the front roof beam and the rear roof beam through a roof beam hydraulic oil cylinder, the front base and the front roof beam, the main base and the main roof beam, and the rear base and the rear roof beam are respectively connected with a hydraulic stand column, the main base and the main roof beam are connected with a hinged shield beam, the main base is H-shaped, the front base and the rear base are E-shaped and matched with the main base, the front base and the rear base are separated from and combined with the main base through the extension and contraction of the base hydraulic oil cylinder, and the front base and the rear base are combined with the main base to form a cuboid when the base hydraulic oil cylinder is retracted.

2. The hydraulic retractable powered support for backfilling continuous coal mining according to claim 1, characterized in that, The two sides of the main roof beam are provided with guide grooves, and the front roof beam and the rear roof beam are extended and retracted to slide in the guide grooves through the extension and contraction of the roof beam hydraulic oil cylinder.

3. The hydraulic retractable powered support for backfilling continuous coal mining according to claim 1, characterized in that, The rear end of the rear roof beam is hingedly connected with a tail beam, the middle part of the tail beam is connected with the bottom of the rear roof beam through a tail beam hydraulic oil cylinder, the rear end of the rear base is vertically provided with a rear base baffle, the tail beam is rotated by controlling the retraction and extension of the tail beam hydraulic oil cylinder, and the tail beam is tightly combined with the rear base baffle when the tail beam is rotated to the vertical state.

4. The hydraulic retractable powered support for backfilling continuous coal mining according to claim 1, characterized in that, The front end of the front roof beam is hingedly connected with a support plate, and the middle part of the support plate is connected with the bottom of the front roof beam through a support plate hydraulic oil cylinder, so that the support plate is rotated by controlling the retraction and extension of the support plate hydraulic oil cylinder.

5. The hydraulic retractable powered support for backfilling continuous coal mining according to claim 1, characterized in that, The hydraulic telescopic supports are arranged side by side to form a hydraulic telescopic support cluster, the front end of the front roof beam of the first row of hydraulic telescopic supports is hingedly connected with a support plate, the rear end of the rear roof beam of the last row of hydraulic telescopic supports is hingedly connected with a tail beam, the rear end of the rear base is vertically provided with a rear base baffle, and the adjacent front and rear rows of hydraulic telescopic supports are connected through hydraulic oil cylinders.

6. The hydraulic retractable powered support for backfilling continuous coal mining according to claim 5, characterized in that, The rear part of the tail beam is provided with a slurry baffle through a slurry baffle hydraulic oil cylinder, the slurry baffle is synchronously upwardly supported to maintain the sealing of the filling space when the tail beam is lowered through the slurry baffle hydraulic oil cylinder, and the slurry baffle is synchronously downwardly retracted when the tail beam is raised through the slurry baffle hydraulic oil cylinder.

7. A method of operating a hydraulic powered roof support for use in a longwall coal mining operation as claimed in claim 5 wherein, The first row of hydraulic telescopic supports is connected with a scraper of a coal cutting and transporting mechanism through a hydraulic oil cylinder, the support plate is rotated to the vertical state, and specifically includes the following steps: Step 1): a filling space is built before filling, when the coal cutter of the coal cutting and transporting mechanism pushes and mines for a certain distance, the front roof beam, the rear roof beam, the front base and the rear base of all the hydraulic telescopic supports in the cluster are gradually and completely retracted, and are synchronously moved to the coal wall of the working face, when the distance between the rear base baffle of the last row of hydraulic telescopic supports and the rear coal wall reaches the designed filling step, the tail beam is rotated to the vertical state to build the filling space with the rear base baffle. Step 2): during the filling and filling body maintenance process, the rear top beam and rear base of the last row of hydraulic telescopic supports remain unchanged before the filling body maintenance to the design strength, the tail beam remains vertical state with the filling space built by the rear base baffle unchanged, the coal mining machine is pushed and mined synchronously during the filling process, the hydraulic telescopic support cluster moves cooperatively with the scraper, the front top beam and front base of the hydraulic telescopic support gradually extend, the main top beam and main base of the hydraulic telescopic support gradually move forward, and the new empty roof area is supported; Step 3): after the filling body maintenance to the design strength, the front top beam, rear top beam, front base and rear base of the hydraulic telescopic support are completely retracted, the hydraulic telescopic support cluster as a whole moves to the coal wall direction of the working face along with the continuous pushing and mining of the coal mining machine, when the coal mining machine is pushed and mined for a certain distance, the tail beam is rotated to the horizontal state to shield the roof.

8. The method of operating a hydraulic prop for a continuous coal mining system with backfilling according to claim 7, characterized in that, The rear part of the tail beam of the last row of hydraulic telescopic supports is provided with a baffle plate through a baffle plate hydraulic cylinder, during the gradual extension of the front top beam and front base of the last row of hydraulic telescopic supports and the gradual forward movement of the main top beam and main base of the hydraulic telescopic support in step 2), the hydraulic column lowers the tail beam, and the baffle plate hydraulic cylinder controls the baffle plate to rise at the same time, so as to block the gap in the filling space when the tail beam is lowered.

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