Roof pressure-bearing sleeve supporting mechanism for recovery caving area of coal mine hydraulic support

Abstract

The utility model provides a roof pressure-bearing sleeve supporting mechanism for a coal mine hydraulic support recovery caving area. The roof pressure-bearing sleeve supporting mechanism comprises a long-top-beam narrow hydraulic support, a hydraulic support to be withdrawn and a front set of hydraulic supports. The long-top-beam narrow hydraulic support comprises a base, a stepping push rod, a stepping oil cylinder, a stand column jack, a long top beam, a top beam, a shield beam, a pressure bearing sleeve, a pressure bearing sleeve telescopic rod, a sliding way oil cylinder, a sliding jack, a sliding block, a rotating shaft a and a rotating shaft b. The pressure-bearing sleeve is sleeved on the long top beam; the stepping push rods of the at least two groups of long-top-beam narrow hydraulic supports are fixedly connected through a stepping connecting beam; the inner space of the pressure-bearing sleeve is higher than the long top beam, and the long top beam moves up and down in the through hole of the pressure-bearing sleeve. Through the cooperation of the long top beam narrow hydraulic supports, the long top beam narrow hydraulic supports achieve self-movement, and the special technical effects that the long top beam narrow hydraulic supports can move forwards continuously, strong support is formed, and a withdrawing fan-shaped area can be formed are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine equipment, in particular to a supporting mechanism for a roof pressure sleeve in a caving area of ​​a coal mine hydraulic support. Background Art

[0002] The withdrawal of working face equipment 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 width of the wall needs to be widened during the use of the coal mining machine to cut the withdrawal channel by itself, and the roof and coal wall cannot be 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] In view of the above problems, a coal mine hydraulic support is proposed to recover the roof pressure sleeve support mechanism in the caving area.

[0005] In order to achieve some or all of the above purposes or other purposes, the present application provides the following technical solutions: including a long top beam narrow hydraulic support, a hydraulic support to be withdrawn, and a front group of hydraulic supports; the long top beam narrow hydraulic support includes a base, a stepping push rod, a stepping cylinder, a column jack, a long top beam, a top beam, a shielding beam, a pressure sleeve, a pressure sleeve telescopic rod, a slideway cylinder, a sliding jack, a slider, a rotating shaft a, and a rotating shaft b; a column jack is arranged between the base and the top beam; the shielding beam is hinged 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 pressure-bearing sleeve is mounted on the long top beam; the top of the sliding jack is connected to the slider, and the slider is slidably connected to the pressure-bearing sleeve; one end of the slide cylinder is connected to the top beam, and the other end of the slide cylinder is connected to the slider; a stepping 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 rod, and the other end of the stepping rod is fixedly connected to the stepping connecting sleeve.

[0006] Furthermore, it also includes a step-by-step connecting beam; there are at least two long top beam narrow hydraulic supports, and the step-by-step connecting sleeves of the at least two long top beam narrow hydraulic supports are fixedly connected via the step-by-step connecting beam.

[0007] Furthermore, the height of the internal space of the pressure-bearing sleeve is higher than the height of the long top beam, and the long top beam moves up and down inside the pressure-bearing sleeve.

[0008] Furthermore, the long top beam passes through the pressure-bearing sleeve, and the pressure-bearing sleeve and the long top beam are connected through a pressure-bearing sleeve telescopic rod, one end of the pressure-bearing sleeve telescopic rod is connected to the pressure-bearing sleeve through a rotating shaft a, and the other end of the pressure-bearing sleeve telescopic rod is connected to the long top beam through a rotating shaft b.

[0009] Furthermore, a slideway matching a sliding block at the top of a sliding jack is provided at the bottom of the pressure sleeve, and there are several sliding jacks.

[0010] Furthermore, a slideway matching the stepping push rod is arranged inside the base.

[0011] The beneficial effect of the utility model is as follows: the lap tongue end of the long top beam is overlapped on the previous group of hydraulic supports, and the strong support formed by the previous group of hydraulic supports for the long top beam narrow hydraulic supports is relied on to safely withdraw the sliding jack, forming a large area of ​​withdrawal fan-shaped area, so that the hydraulic support to be withdrawn can start to turn after moving forward a small distance, and the demand for expanded width is narrowed to achieve rapid withdrawal. After the expanded distance is reduced and the exposed width of the roof of the withdrawal channel becomes smaller, the stress on the top plate is improved, the roof and coal wall can be effectively supported, the safety of the operation is improved and the use requirements of the withdrawal channel are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure;

[0013] Figure 2 It is a schematic diagram of the structure of a long top beam narrow hydraulic support;

[0014] Figure 3 It is a schematic diagram of the initial state of the method for forming a fan-shaped withdrawal space of the utility model;

[0015] Figure 4 This is a schematic diagram of the state of step 1 of the method for forming a fan-shaped withdrawal space of the utility model;

[0016] Figure 5 This is a schematic diagram of the state of step 2 of the method for forming a fan-shaped withdrawal space of the utility model;

[0017] Figure 6 It is a schematic diagram of the fourth state of the step of the method for forming a fan-shaped withdrawal space of the utility model;

[0018] Figure 7This is a schematic diagram of the fifth state of the method for forming a fan-shaped withdrawal space of the utility model;

[0019] Figure 8 It is a schematic diagram of the seventh state of the method for forming a fan-shaped withdrawal space of the utility model;

[0020] Fig. 9 It is a schematic diagram of the eighth state of the method for forming a fan-shaped withdrawal space of the utility model;

[0021] Fig.10 It is a schematic diagram of the steps and states of the method for forming a fan-shaped retracement space of the utility model;

[0022] Fig.11 The connection details of the long top beam, pressure sleeve, sliding jack and slideway cylinder are shown;

[0023] Fig.12 It is a top sectional view of the connection between the long top beam and the pressure sleeve;

[0024] Fig.13 This is a schematic diagram of the withdrawal space of the traditional support device;

[0025] Fig.14 It is a schematic diagram of the withdrawal space of the support device of the utility model;

[0026] In the figure: the structure includes 1, base, 2, stepping push rod, 3, stepping cylinder, 4, column jack, 5, long top beam, 6, shielding beam, 7, pressure sleeve, 8, pressure sleeve telescopic rod, 9, slideway cylinder, 10, sliding jack, 11, hydraulic support to be withdrawn, 12, the front group of hydraulic support, 13, stepping connecting beam, 14, top beam, 15, long top beam lap tongue end, 16, slider, 17, rotating shaft a, 18, rotating shaft b, d, expansion width;

[0027] In the specific embodiment, 1-1, the first base, 1-2, the second base, 2-1, the first stepping push rod, 2-2, the second stepping push rod, 3-1, the first stepping oil cylinder, 3-2, the second stepping oil cylinder, 4-1, the first column jack, 4-2, the second column jack, 5-1, the first long top beam, 5-2, the second long top beam, 6-1, the first protective beam, 6-2, the second protective beam, 7-1, the first pressure sleeve, 7-2, the second pressure sleeve, 10-1, the first sliding jack, 10-2, the second sliding jack, 11, the hydraulic support to be withdrawn, 12, the previous group of hydraulic supports, 13, the stepping connecting beam, 14-1, the first top beam, 14-2, the second top beam, 15-1, the first long top beam overlapping tongue end, 15-2, the second long top beam overlapping tongue end, d, the expansion width. DETAILED DESCRIPTION

[0028] In order to make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] See attached Figure 1-14 , a coal mine hydraulic support recovery roof pressure sleeve support mechanism in the caving area, including a long top beam 5 narrow hydraulic support, a hydraulic support to be withdrawn 11, and a front group of hydraulic supports 12; the long top beam 5 narrow hydraulic support includes a base 1, a stepping push rod 2, a stepping cylinder 3, a column jack 4, a long top beam 5, a top beam 14, a shielding beam 6, a pressure sleeve 7, a pressure sleeve telescopic rod 8, a slideway cylinder 9, a sliding jack 10, a slider 16, a rotating shaft a17, and a rotating shaft b18; a column jack 4 is arranged between the base 1 and the top beam 14; the shielding beam 6 and one end of the top beam 14 The top beam 14 is hingedly connected, and the other end of the top beam 14 is fixedly connected to one end of the long top beam 5; the pressure sleeve 7 is sleeved on the long top beam 5; the top of the sliding jack is connected to the slider, and the slider is slidably connected to the pressure sleeve 7; one end of the slide cylinder 9 is connected to the top beam 14, and the other end of the slide cylinder 9 is connected to the slider; a stepping rod 2 and a stepping cylinder 3 are installed inside the base 1, one end of the stepping cylinder 3 is fixedly connected to the base 1, and the other end of the stepping cylinder 3 is fixedly connected to one end of the stepping rod 2, and the other end of the stepping rod 2 is fixedly connected to the stepping connecting sleeve.

[0030] Furthermore, it also includes a step-by-step connecting beam; there are at least two long top beams 5 and narrow hydraulic supports, and the step-by-step connecting sleeves of the at least two long top beams 5 and narrow hydraulic supports are fixedly connected via the step-by-step connecting beam 13 .

[0031] Furthermore, the height of the inner space of the pressure-bearing sleeve 7 is higher than the height of the long top beam 5 , and the long top beam 5 moves up and down inside the pressure-bearing sleeve 7 .

[0032] Furthermore, the long top beam 5 passes through the pressure-bearing sleeve 7, and the pressure-bearing sleeve 7 and the long top beam 5 are connected through a pressure-bearing sleeve telescopic rod 8, one end of the pressure-bearing sleeve telescopic rod 8 is connected to the pressure-bearing sleeve 7 through a rotating shaft a17, and the other end of the pressure-bearing sleeve telescopic rod 8 is connected to the long top beam 5 through a rotating shaft b18.

[0033] Furthermore, a sliding block is arranged at the top of the sliding jack 10, and a slideway matching the sliding block at the top of the sliding jack 10 is arranged at the bottom of the pressure sleeve 7. There are several sliding jacks 10, and the supporting force for the long top beam narrow hydraulic support is strengthened.

[0034] Furthermore, a slideway matching the stepping push rod 2 is arranged inside the base 1 .

[0035] Furthermore, the method for forming a fan-shaped withdrawal space of the roof pressure sleeve support mechanism of the coal mine hydraulic support recovery caving area is characterized in that the method for forming the fan-shaped withdrawal space comprises the following steps:

[0036] In the initial state, the two pressure sleeves are overlapped on the hydraulic support 11 to be withdrawn, the two sliding jacks are extended to the ground and located in the middle of the two pressure sleeves, and the two stepping cylinders are in a retracted state;

[0037] Step 1: The front group of hydraulic supports 12 descends, the two stepping cylinders extend, the stepping connecting beam 13 moves forward, and the two stepping push rods move forward synchronously by a distance of the width of the hydraulic support;

[0038] Step 2: The first long top beam 5-1 sinks inside the first pressure sleeve 7-1, the first stepping cylinder 3-1 contracts, the first long top beam 5-1 moves forward until the first long top beam lap tongue end 15-1 is located above the previous group of hydraulic supports 12, the first pressure sleeve telescopic rod 8-1 contracts, and the first pressure sleeve 7-1 remains in place; then the first long top beam 5-1 rises inside the first pressure sleeve 7-1, and the first sliding jack 10-1 extends and touches the ground;

[0039] Step 3: The second long top beam 5-2 sinks inside the second pressure sleeve 7-2, the second stepping cylinder 3-2 contracts, the second long top beam 5-2 moves forward until the second long top beam lap tongue end 15-2 is located above the previous group of hydraulic supports 12, the second pressure sleeve telescopic rod 8-2 contracts, and the second pressure sleeve 7-2 remains in place; then the second long top beam 5-2 rises inside the second pressure sleeve 7-2, and the second sliding jack 10-2 extends and touches the ground; other long top beam narrow hydraulic supports are analogous;

[0040] Step 4: The front set of hydraulic supports 12 rises until it contacts the overlapping tongue ends of the two long top beams;

[0041] Step 5: The two sliding jacks retract, the two slide cylinders retract, and the two sliding jacks move back to reserve a rear triangle drop-out area. The hydraulic support 11 to be withdrawn descends to a point where it does not contact the two pressure sleeves, and the hydraulic support 11 to be withdrawn is pulled out of the rear triangle drop-out area. At this time, the two sliding jacks can be retracted and extended. The retracted state can reserve more space for the hydraulic support 11 to be withdrawn, which is convenient for pulling out the hydraulic support 11 to be withdrawn. The extended state can provide a weak supporting force for the long top beam 5-1 narrow hydraulic support.

[0042] Step 6: The two sliding jacks are retracted, the two slideway cylinders are extended, the two sliding jacks are moved forward to the middle position of the two pressure sleeves, and the two sliding jacks are extended to the ground;

[0043] Step 7: The front set of hydraulic supports 12 is lowered to a position below the two pressure sleeves;

[0044] Step 8: The first narrow hydraulic support with a long top beam is lowered until it does not touch the top plate, the first sliding jack 10 is retracted and does not touch the ground, the telescopic rod 8 of the first pressure sleeve is extended, and the first pressure sleeve 7-1 is moved forward to above the previous group of hydraulic supports 12; then the first narrow hydraulic support with a long top beam is raised, the first sliding jack 10 is extended and touches the ground, and the first pressure sleeve 7-1 is raised until it touches the top plate;

[0045] Step 9: The second narrow hydraulic support with long top beam is lowered until it does not touch the top plate, the second sliding jack 10 is retracted and does not touch the ground, the second pressure sleeve telescopic rod 8 is extended, and the second pressure sleeve 7-2 is moved forward to above the previous group of hydraulic supports 12; then the second narrow hydraulic support with long top beam is raised, the second sliding jack 10 is extended and touches the ground, and the second pressure sleeve 7-2 is raised until it touches the top plate; the other narrow hydraulic supports with long top beams are operated in the same way;

[0046] Step 10: The previous group of hydraulic supports 12 rises to a position in contact with the two pressure sleeves, and at this time the previous group of hydraulic supports 12 becomes the hydraulic supports 11 to be withdrawn in the next cycle;

[0047] Step 11: Repeat steps 1 to 10 above.

[0048] Beneficial effects of the method: through the cooperation of several long top beam narrow hydraulic supports, several long top beam narrow hydraulic supports can achieve self-movement, producing a special technical effect of being able to move forward continuously, form strong support, and form a retreat fan-shaped area.

[0049] The realization of large-space full-roof support in the triangular falling area after withdrawal has the following requirements for the re-spreading working face: Since the front end of the column jack in the triangular falling area after withdrawal needs to alternately lift the support to be withdrawn and the previous group of supports to realize the cantilever-free support at the front end of the narrow top beam hydraulic support, the previous group of hydraulic supports to be withdrawn needs to be lowered to a certain height. Therefore, the hydraulic support should have a certain lifting height of the active column after laying the net.

[0050] The principle of realizing large space full roof support in the triangle caving area after retreat:

[0051] (1) At least two groups of long top beam narrow hydraulic supports are used in the triangular fall area after retreat;

[0052] (2) The front end of the top beam (pressure sleeve) of the column jack is alternately connected to the top by the hydraulic support to be withdrawn and the previous group of hydraulic supports, so that the front end of the top beam (pressure sleeve) of the column jack is overlapped on the previous group of hydraulic supports to be withdrawn, thereby realizing high-strength top plate support without cantilever.

[0053] (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 temporary support cylinder 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.

[0054] The pressure sleeve cooperates with the narrow support to move forward step by step, realizing alternating top connection and realizing a technical solution of high-strength cantilever-free support of the narrow hydraulic support.

[0055] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A coal mine hydraulic support recovers the roof pressure sleeve support mechanism in the caving area, characterized by: It includes a long top beam narrow hydraulic support, a hydraulic support to be withdrawn, and a front group of hydraulic supports; the long top beam narrow hydraulic support includes a base, a stepping push rod, a stepping cylinder, a column jack, a long top beam, a top beam, a shielding beam, a pressure sleeve, a pressure sleeve telescopic rod, a slide cylinder, a sliding jack, a slider, a rotating shaft a, and a rotating shaft b; 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, and the other end of the top beam is fixedly connected to one end of the long top beam; the pressure sleeve is sleeved on the long top beam; the top end of the sliding jack is connected to the slider, and the slider is slidably connected to the pressure sleeve; one end of the slide cylinder is connected to the top beam, and the other end of the slide cylinder is connected to the slider; 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, and the other end of the stepping push rod is fixedly connected to the step connecting sleeve.

2. The support mechanism for the roof pressure sleeve of the coal mine hydraulic support recovery caving area according to claim 1 is characterized by: It also includes a step-by-step connecting beam; there are at least two long top beam narrow hydraulic supports, and the step-by-step connecting sleeves of the at least two long top beam narrow hydraulic supports are fixedly connected via the step-by-step connecting beam.

3. The support mechanism for the roof pressure sleeve of the coal mine hydraulic support recovery caving area according to claim 2 is characterized by: The height of the inner space of the pressure-bearing sleeve is higher than the height of the long top beam, and the long top beam moves up and down inside the pressure-bearing sleeve.

4. The support mechanism for the roof pressure sleeve of the coal mine hydraulic support recovery caving area according to claim 1 is characterized by: The long top beam passes through the pressure sleeve, and the pressure sleeve and the long top beam are connected through a pressure sleeve telescopic rod. One end of the pressure sleeve telescopic rod is connected to the pressure sleeve through a rotating shaft a, and the other end of the pressure sleeve telescopic rod is connected to the long top beam through a rotating shaft b.

5. The support mechanism for the roof pressure sleeve of the coal mine hydraulic support recovery caving area according to claim 1 is characterized by: The bottom of the pressure sleeve is provided with a slideway matching with the sliding block at the top of the sliding jack, and there are several sliding jacks.

6. The support mechanism for the roof pressure sleeve of the coal mine hydraulic support recovery caving area according to claim 1 is characterized by: A slideway matching the stepping push rod is arranged inside the base.

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