Roof supporting mechanism for recovery caving area of coal mine hydraulic support

Abstract

The utility model discloses a roof supporting mechanism for a coal mine hydraulic support recovery caving area. The roof supporting mechanism comprises a long-top-beam narrow hydraulic support, a front set of hydraulic supports and a hydraulic support to be withdrawn. The long-top-beam narrow hydraulic support is composed of a lap joint structure, a long top beam, a top beam, a shield beam, a two-connecting rod, a stepping push rod, a stepping connecting sleeve, a base, a stepping push rod, a sliding jack, a stand column jack and a telescopic device. At least two stand column jacks are arranged between the base and the top beam. The base is fixedly connected with one side of the two-connecting rod; and the other side of the two-connecting rod is connected with the shield beam through a hinge. According to the utility model, after the length space of the retracement rear triangular area is increased, the retracement hydraulic support can start to steer after moving forwards for a small distance, so that the requirement on the width of the expanded side is reduced, and the expanded side is reduced to realize rapid retracement.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine equipment, and specifically relates to a coal mine hydraulic support for recovering a roof support mechanism in a caving area. Background Art

[0002] Equipment withdrawal on the coal mining face at the end of coal mining is an important part of coal mining. At present, there are many methods for constructing withdrawal channels, mainly the following three methods: (1) Method 1: The method of using the coal mining machine to cut the withdrawal channel by itself, using the traditional hinged beam single hydraulic support. Under the condition of large mining height, the coal mining machine cuts the withdrawal channel by itself, and the width of the wall needs to be widened. The roof and coal wall are not effectively supported. The safety of personnel entering the coal wall is poor. There is no reliable support platform for anchor support, and construction is difficult. (2) Method 2: The withdrawal channel is constructed in advance. Under the action of the advanced support pressure of the working face, the tunnel is severely deformed, and often fails to achieve the goal and the tunnel is retained. The tunnel maintenance is difficult and the investment cost is high; (3) The withdrawal channel is excavated and supported in sections, and the blasting technology is used for construction. The working face has many comprehensive mining equipment and the equipment protection pressure is high, which is easy to cause equipment damage. In addition, the multi-section cross-blasting construction, the process is many, and the risk is high. Under the action of the advanced pressure, the coal wall is crushed and the coal wall is easily broken and injured by the blasting vibration.

[0003] The channel construction methods currently used all have certain drawbacks and shortcomings, and are unable to effectively protect the construction safety of on-site workers and ensure the use requirements of the evacuation channel. Utility Model Content

[0004] Based on this, it is necessary to provide a coal mine hydraulic support recovery caving area roof support mechanism and its use method in the caving area where the hydraulic support is recovered, in order to address the technical problem that the withdrawal channel construction method of the existing technology cannot effectively protect the construction safety of on-site workers and ensure the technical requirements for the use of the withdrawal channel.

[0005] The utility model provides a coal mine hydraulic support for recovering a roof support mechanism in a caving area, comprising: a long top beam narrow hydraulic support, a front group of hydraulic supports and a hydraulic support to be withdrawn; the long top beam narrow hydraulic support is composed of a lap joint structure, a long top beam, a top beam, a shielding beam, a base, a stepping connecting sleeve, a stepping push rod, a sliding jack, a column jack and a telescopic device; a column jack is arranged between the base and the top beam; the shielding beam is hingedly connected to one end of the top beam; the other end of the top beam is fixedly connected to one end of the long top beam; the lap joint structure is connected to the other end of the long top beam through a telescopic device; a slideway cylinder is arranged between the sliding jack and the column jack; a stepping push rod and a stepping cylinder are installed inside the base; one end of the stepping cylinder is fixedly connected to the base; the other end of the stepping cylinder is fixedly connected to one end of the stepping push rod; the other end of the stepping push rod is fixedly connected to the stepping connecting sleeve.

[0006] Furthermore, the telescopic device is a hydraulic cylinder.

[0007] Furthermore, it also includes a step-by-step connecting beam; there are at least two long top beam narrow hydraulic supports; the step-by-step connecting beam passes through all the step-by-step connecting sleeves; the step-by-step connecting beam and the step-by-step connecting sleeves are fixed by a pin shaft.

[0008] Furthermore, a slideway is arranged on the long top beam; the sliding jack is connected to the slider; the slider cooperates with the slideway; one end of the slideway oil cylinder is fixedly connected to the long top beam; and the other end of the slideway oil cylinder is connected to the slider.

[0009] Furthermore, the overlapping structure is a folding overlapping tongue or an inserting tongue.

[0010] Furthermore, the folding overlapping tongue is hingedly connected with the long top beam through a telescopic device.

[0011] Furthermore, the plug-in tongue forms a plug-in connection with the long top beam through a telescopic device.

[0012] A coal mine hydraulic support for recovering a roof support mechanism in a caving area comprises the following steps:

[0013] Step 1: The telescopic device of the hydraulic support to be withdrawn is retracted;

[0014] Step 2: The first sliding jack is retracted, and the second sliding jack remains stationary on the long top beam; the stepping cylinder of the first stepping push rod is retracted, and the first long top beam narrow hydraulic support first moves downward and then moves forward by the width of the hydraulic support; the first sliding jack is extended, so that the first sliding jack contacts the ground; the first long top beam narrow hydraulic support moves upward to contact the top plate;

[0015] Step 3: The second sliding jack is retracted, and the first sliding jack remains motionless on the long top beam; the stepping cylinder of the second stepping push rod is retracted, and the second long top beam narrow hydraulic support first moves downward and then moves forward by the width of the hydraulic support; the second sliding jack is extended, so that the second sliding jack contacts the ground; the second long top beam narrow hydraulic support moves upward and contacts the top plate; the other long top beam narrow hydraulic supports are operated in the same way;

[0016] Step 4: The telescopic device of the hydraulic support to be withdrawn is extended to support the long top beams of the two long top beam narrow hydraulic supports;

[0017] Step 5: The telescopic device of the first set of hydraulic supports is retracted;

[0018] Step 6: The telescopic device of the overlapped structure is extended;

[0019] Step 7: The telescopic device of the previous group of hydraulic supports is extended, and the previous group of hydraulic supports supports the overlapping structure; the overlapping structure is overlapped on the top beam of the previous group of hydraulic supports;

[0020] Step 8: The telescopic device of the hydraulic support to be withdrawn is retracted so that the hydraulic support to be withdrawn can be smoothly pulled out;

[0021] Step 9: The sliding jack is retracted; the telescopic device between the sliding jack and the column jack is retracted; the sliding jack is moved to a position away from the hydraulic support to be withdrawn, and a rotatable fan-shaped withdrawal working area is formed in the rear triangle falling area;

[0022] Step 10: Pull the retracted hydraulic support to be withdrawn out from the rear triangle falling area;

[0023] Step 11: The slideway cylinder between the sliding jack and the column jack is extended, and the sliding jack is moved to the initial support state; the stepping cylinder of the stepping push rod is extended; and all the stepping push rods are moved forward by the width of a hydraulic support;

[0024] Step 12: The telescopic device of the overlapped structure is contracted to restore the long top beam narrow hydraulic support to its initial state;

[0025] Step 13: Repeat steps 1 to 12 above.

[0026] Beneficial effects: The utility model forms a large recovery space of high-strength gantry type, and the recovery hydraulic support can turn to recovery and transportation to the well after a small distance out of the column; after the length space of the triangle area is increased after withdrawal, the withdrawal hydraulic support can start to turn after moving forward a small distance, and the demand for expanding the width of the wall becomes narrower, which reduces the impact of large-width opening of the roof on the roof during the recovery work and improves safety; the recovery period is shortened, and after the exposed width of the roof of the withdrawal channel becomes smaller, the stress on the roof is improved, the roof and coal wall can be effectively supported, which improves the safety of the operation and ensures the use requirements of the withdrawal channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the initial state structure of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the long top beam narrow hydraulic support of the utility model;

[0029] Figure 3 This is a schematic diagram of the state of step 2 of the space withdrawal method of the utility model;

[0030] Figure 4 This is a schematic diagram of the step three state of the space withdrawal method of the utility model;

[0031] Figure 5This is a schematic diagram of the fourth state of the step of the space withdrawal method of the utility model;

[0032] Figure 6 It is a front view of the step 5 state of the space withdrawal method of the utility model;

[0033] Figure 7 It is a front view of the step nine state of the space withdrawal method of the utility model;

[0034] Figure 8 It is a front view of the step 12 state of the space withdrawal method of the utility model;

[0035] Fig. 9 It is a partial schematic diagram of the overlapping structure of Example 2 of the utility model;

[0036] Fig.10 This is a schematic diagram of the withdrawal space of the traditional support device;

[0037] Fig.11 It is a schematic diagram of the withdrawal space of the support device of the utility model;

[0038] Fig.12 It is a schematic diagram of the structure of the utility model;

[0039] In the figure: 1-1, the first narrow hydraulic support with a long top beam, 1-2 the second narrow hydraulic support with a long top beam, 2, the previous group of hydraulic supports, 3, the hydraulic support to be withdrawn, 4, the long top beam, 5, the top beam, 6, the covering beam, 7, the second connecting rod, 8, the base, 9, the sliding jack, 10, the stepping connecting beam, 11, the stepping push rod, 12, the stepping connecting sleeve, 13, the column jack, 14, the telescopic device, 15, the folding lap tongue, 16, the plug-in tongue, 17, the stepping cylinder, 18, the slide cylinder, 19, the slider, 20, the slide, d, the expansion width. DETAILED DESCRIPTION

[0040] Example 1

[0041] The utility model is described in detail below in conjunction with the accompanying drawings. Figure 1-8 and Fig.10 and Fig.11As shown, a coal mine hydraulic support recovery roof support mechanism in a caving area includes: a long top beam narrow hydraulic support, a front group of hydraulic supports 2 and a hydraulic support 3 to be withdrawn; the long top beam narrow hydraulic support is composed of a lap structure, a long top beam 4, a top beam 5, a shielding beam 6, a second connecting rod 7, a stepping connecting sleeve 12, a base 8, a stepping push rod 11, a sliding jack 9, a column jack 13 and a telescopic device 14; a column jack 13 is arranged between the base 8 and the top beam 5; the base 8 is fixedly connected to one side of the second connecting rod 7; the other side of the second connecting rod 7 is hinged to the shielding beam 6 Chain connection; the shield beam 6 is hingedly connected to one end of the top beam 5; the other end of the top beam 5 is fixedly connected to one end of the long top beam 4; the lap structure is connected to the other end of the long top beam 4 through a telescopic device 14; a slide cylinder 18 is arranged between the sliding jack 9 and the column jack 13; a stepping rod 11 and a stepping cylinder 17 are installed inside the base 8; one end of the stepping cylinder 17 is fixedly connected to the base 8; the other end of the stepping cylinder 17 is fixedly connected to one end of the stepping rod 11; the other end of the stepping rod 11 is fixedly connected to the stepping connecting sleeve 12.

[0042] Furthermore, the telescopic device 14 is a hydraulic cylinder.

[0043] Furthermore, it also includes a step connection beam 10; there are at least two long top beam narrow hydraulic supports; the step connection beam 10 passes through all the step connection sleeves 12; the step connection beam 10 and the step connection sleeves 12 are fixed by a pin shaft.

[0044] Furthermore, a slideway 19 is provided on the long top beam 4 ; the sliding jack 9 is connected to the slider 20 ; the slider 19 cooperates with the slideway 20 ; one end of the slideway cylinder 18 is fixedly connected to the long top beam 4 ; the other end of the slideway cylinder 18 is connected to the slider 20 .

[0045] Furthermore, the overlapping structure is a plug-in tongue 16 .

[0046] Furthermore, the plug-in tongue forms a plug-in connection with the long top beam through a telescopic device; the initial state refers to Figure 1 As shown;

[0047] A coal mine hydraulic support recovery roof support mechanism in a caving area includes the following steps:

[0048] Step 1: The telescopic device of the hydraulic support to be withdrawn is retracted; the height is lowered to a certain extent so that the long top beam can be extended close to the previous group of hydraulic supports;

[0049] Step 2: The first sliding jack is retracted, and the second sliding jack remains on the long top beam; the second sliding jack is used to provide temporary support when there is no hydraulic support to connect the long top beam; the stepping cylinder of the first stepping push rod is retracted, and the first long top beam narrow hydraulic support first moves downward and then moves forward by the width of the hydraulic support; the first sliding jack is extended, so that the first sliding jack contacts the ground; the first long top beam narrow hydraulic support moves upward and contacts the top plate;

[0050] Step 3: The second sliding jack is retracted, and the first sliding jack remains motionless on the long top beam; the function of the first sliding jack is to provide temporary support when there is no hydraulic support to connect the long top beam; the stepping cylinder of the second stepping push rod is retracted, and the second long top beam narrow hydraulic support first moves downward and then moves forward by the width of the hydraulic support; the second sliding jack is extended to make the second sliding jack contact with the ground; the second long top beam narrow hydraulic support moves upward to contact with the top plate; the other long top beam narrow hydraulic supports are operated in the same way;

[0051] Step 4: The telescopic device of the hydraulic support to be withdrawn is extended to support the long top beams of the two narrow hydraulic supports with long top beams; a "door"-shaped strong top plate support effect is formed between the hydraulic support to be withdrawn and the narrow hydraulic supports with long top beams;

[0052] Step 5: The telescopic device of the first set of hydraulic supports is retracted and lowered to a certain height so that the plug tongue can be extended;

[0053] Step 6: The telescopic device of the plug-in tongue is extended; the plug-in tongue extends out from the long top beam;

[0054] Step 7: The telescopic device of the previous group of hydraulic supports is extended, and the previous group of hydraulic supports holds the plug-in tongue; so that a "door" type strong top plate support effect is formed between the previous group of hydraulic supports and the long top beam narrow hydraulic supports; the plug-in tongue overlaps the top beam of the previous group of hydraulic supports;

[0055] Step 8: The telescopic device of the hydraulic support to be withdrawn is retracted so that the hydraulic support to be withdrawn can be smoothly pulled out;

[0056] Step 9: The sliding jack is retracted; the telescopic device between the sliding jack and the column jack is retracted; the sliding jack is moved to a position away from the hydraulic support to be withdrawn, and a rotatable fan-shaped withdrawal working area is formed in the rear triangle falling area;

[0057] Step 10: Pull the retracted hydraulic support to be withdrawn out from the rear triangle falling area;

[0058] Step 11: The slideway cylinder between the sliding jack and the column jack is extended, and the sliding jack is moved to the initial support state; the stepping cylinder of the stepping push rod is extended; and all the stepping push rods are moved forward by the width of a hydraulic support;

[0059] Step 12: The telescopic device of the plug-in tongue is retracted to restore the long top beam narrow hydraulic support to its initial state;

[0060] Step 13: Repeat steps 1 to 12 above.

[0061] Example 2

[0062] See attached Fig. 9 As shown, the technical solution of Example 2 is basically the same as that of Example 1, except that:

[0063] The overlapping structure is a folded overlapping tongue 15 .

[0064] Furthermore, the folding lap joint tongue is hingedly connected with the long top beam through a telescopic device; for the initial state, please refer to Figure 1 ;

[0065] A coal mine hydraulic support recovery roof support mechanism in a caving area includes the following steps:

[0066] Step 1: The telescopic device of the hydraulic support to be withdrawn is retracted; the height is lowered to a certain extent so that the long top beam can be extended close to the previous group of hydraulic supports;

[0067] Step 2: The first sliding jack is retracted, and the second sliding jack remains on the long top beam; the second sliding jack is used to provide temporary support when there is no hydraulic support to connect the long top beam; the stepping cylinder of the first stepping push rod is retracted, and the first long top beam narrow hydraulic support first moves downward and then moves forward by the width of the hydraulic support; the first sliding jack is extended, so that the first sliding jack contacts the ground; the first long top beam narrow hydraulic support moves upward and contacts the top plate;

[0068] Step 3: The second sliding jack is retracted, and the first sliding jack remains motionless on the long top beam; the function of the first sliding jack is to provide temporary support when there is no hydraulic support to connect the long top beam; the stepping cylinder of the second stepping push rod is retracted, and the second long top beam narrow hydraulic support first moves downward and then moves forward by the width of the hydraulic support; the second sliding jack is extended to make the second sliding jack contact with the ground; the second long top beam narrow hydraulic support moves upward to contact with the top plate; the other long top beam narrow hydraulic supports are operated in the same way;

[0069] Step 4: The telescopic device of the hydraulic support to be withdrawn is extended to support the long top beams of the two narrow hydraulic supports with long top beams; a "door"-shaped strong top plate support effect is formed between the hydraulic support to be withdrawn and the narrow hydraulic supports with long top beams;

[0070] Step 5: The telescopic device of the previous set of hydraulic supports is retracted; the height is lowered to facilitate the unfolding of the folding lap tongue;

[0071] Step 6: The telescopic device of the folding lap tongue is extended; the folding lap tongue is unfolded around the long top beam;

[0072] Step 7: The telescopic device of the previous group of hydraulic supports is extended, and the previous group of hydraulic supports supports the folding lap tongue, so that a "door" type strong top plate support is formed between the previous group of hydraulic supports and the long top beam narrow hydraulic supports; the folding lap tongue is overlapped on the top beam of the previous group of hydraulic supports;

[0073] Step 8: The telescopic device of the hydraulic support to be withdrawn is retracted so that the hydraulic support to be withdrawn can be smoothly pulled out;

[0074] Step 9: The sliding jack is retracted; the telescopic device between the sliding jack and the column jack is retracted; the sliding jack is moved to a position away from the hydraulic support to be withdrawn, and a rotatable fan-shaped withdrawal working area is formed in the rear triangle falling area;

[0075] Step 10: Pull the retracted hydraulic support to be withdrawn out from the rear triangle falling area;

[0076] Step 11: The slideway cylinder between the sliding jack and the column jack is extended, and the sliding jack is moved to the initial support state; the stepping cylinder of the stepping push rod is extended; and all the stepping push rods are moved forward by the width of a hydraulic support;

[0077] Step 12: The telescopic device of the folding lap tongue is retracted to restore the long top beam narrow hydraulic support to its initial state;

[0078] Step 13: Repeat steps 1 to 12 above.

[0079] The principle of full roof support in the large space of the triangle area after retreat:

[0080] (1) After the retreat, the triangle area uses a narrow hydraulic support with a long top beam (2-5);

[0081] (2) The front end of the top beam of the narrow hydraulic support with long top beam (folding lap tongue or plug-in tongue) is alternately connected with the hydraulic support to be withdrawn and the previous group of hydraulic supports, so that the front end of the top beam of the narrow hydraulic support with long top beam (folding lap tongue or plug-in tongue) is overlapped on the previous group of hydraulic supports to be withdrawn, realizing high-strength roof support without cantilever;

[0082] (3) The withdrawal channel is transported under the top beam of the hydraulic support. The channel height meets the requirements for transporting the support. The telescopic device of the sliding jack is conveniently used. The long top beam hydraulic support can realize a rotatable fan-shaped withdrawal work area in the rear triangle falling area, and the expansion width becomes narrower.

[0083] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A coal mine hydraulic support recovery roof support mechanism in a caving area, characterized in that: include: Long top beam narrow hydraulic support, the front group of hydraulic supports and the hydraulic supports to be withdrawn; The long top beam narrow hydraulic support consists of an overlap structure, a long top beam, a top beam, a shielding beam, a base, a stepping connecting sleeve, a stepping push rod, a sliding jack, a column jack and a telescopic device; a column jack is arranged between the base and the top beam; the shielding beam is hingedly connected to one end of the top beam; the other end of the top beam is fixedly connected to one end of the long top beam; the overlap structure is connected to the other end of the long top beam through a telescopic device; a slideway cylinder is arranged between the sliding jack and the column jack; a stepping push rod and a stepping cylinder are installed inside the base; one end of the stepping cylinder is fixedly connected to the base; the other end of the stepping cylinder is fixedly connected to one end of the stepping push rod; the other end of the stepping push rod is fixedly connected to the stepping connecting sleeve.

2. According to claim 1, a coal mine hydraulic support recovery roof support mechanism for a caving area, characterized in that: The telescopic device is a hydraulic cylinder.

3. According to claim 1, a coal mine hydraulic support recovery caving area roof support mechanism, characterized in that: It also includes a step-by-step connecting beam; there are at least two long top beam narrow hydraulic supports; the step-by-step connecting beam passes through all the step-by-step connecting sleeves; the step-by-step connecting beam and the step-by-step connecting sleeves are fixed by a pin shaft.

4. According to claim 1, a coal mine hydraulic support recovery caving area roof support mechanism, characterized in that: A slideway is arranged on the long top beam; the sliding jack is connected with the sliding block; the sliding block matches with the slideway; one end of the slideway oil cylinder is fixedly connected with the long top beam; and the other end of the slideway oil cylinder is connected with the sliding block.

5. According to claim 1, a coal mine hydraulic support recovery caving area roof support mechanism, characterized in that: The overlapping structure is a folding overlapping tongue or an inserting tongue.

6. A coal mine hydraulic support recovery roof support mechanism in a caving area according to claim 5, characterized in that: The folding overlap tongue is hingedly connected with the long top beam through a telescopic device.

7. A coal mine hydraulic support recovery roof support mechanism in a caving area according to claim 5, characterized in that: The plug-in tongue forms a plug-in connection with the long top beam through a telescopic device.

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