Apparatus for protecting roof tray when gob-side entry retaining end support migrates

Abstract

An apparatus for protecting a roof tray when a gob-side entry retaining end support migrates is provided. The apparatus is mounted at a top end position of a hydraulic support, and includes a movable bearing mechanism, an automatic expansion/contraction connecting groove mechanism, and an active reset mechanism. The movable bearing mechanism includes two parallel belts and a plurality of rollers supporting the belts, and the rollers are mounted on and supported by a bearing mechanism. The automatic expansion/contraction connecting groove mechanism is two concave base plates fixed between the two belts, and the two concave base plates are spaced by a distance. The active reset mechanism includes two telescopic rods and reset springs sleeved on the telescopic rods, and the telescopic rod is connected to an end portion of the reset spring to form a synchronous mechanism.

Claims

1. An apparatus for protecting a roof tray when a gob-side entry retaining end support migrates, comprising: a movable bearing mechanism, an automatic expansion-contraction connecting groove mechanism, and an active reset mechanism; wherein the apparatus is mounted at a top end position of a hydraulic support; the movable bearing mechanism comprises two conveying belts and a plurality of rollers, wherein the two conveying belts are parallel to each other and are of an equal length; the plurality of rollers are matched with the two conveying belts and support the two conveying belts, and the plurality of rollers are mounted on and supported by a bearing mechanism; the automatic expansion-contraction connecting groove mechanism is two concave base plates, wherein the two concave base plates are fixed between the two conveying belts, and the two concave base plates are disposed opposite to each other and spaced by a distance; and the active reset mechanism comprises two telescopic rods and reset springs, wherein each reset spring of the reset springs is sleeved on the two telescopic rods, each telescopic rod of the two telescopic rods is connected to an end portion of the reset springs to form a synchronous mechanism, and a first end of the each telescopic rod and a first end of the each reset spring are connected to one side of the two concave base plates and a second end of the each telescopic rod and a second end of the each reset spring are fixed at the top end position of the hydraulic support through a fixed support.

2. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 1, wherein, the two concave base plates are connected through a plurality of telescopic springs, and the plurality of telescopic springs are anchored on the concave two base plates on two sides of the plurality of telescopic springs through an anchor member.

3. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 2, wherein, the each telescopic rod is connected to the fixed support through an end hinge ball in a hinged manner.

4. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 3, wherein, a surface of each conveying belt of the two conveying belts is provided with meshing teeth, wherein the surface of the each conveying belt is in contact with the plurality of rollers, and each of the plurality of rollers is a meshing roller matching the meshing teeth on the each conveying belt.

5. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 4, wherein, the each telescopic rod is a damping telescopic rod.

6. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 5, wherein, an expansion amount of a telescopic spring of the plurality of telescopic springs is defined as k, a length of the telescopic spring in an initial state is defined as a, a width of each of the two concave base plates is defined as b, a width of each of the two conveying belt is defined as c, a total width of the gob-side entry retaining end support is defined as L, and k+a+2b+2c=L; and a maximum offset between anchor rods or anchor cables of each row is defined as M, and M=k.

7. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 3, wherein, the each telescopic rod is a damping telescopic rod.

8. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 7, wherein, an expansion amount of a telescopic spring of the plurality of telescopic springs is defined as k, a length of the telescopic spring in an initial state is defined as a, a width of each of the two concave base plates is defined as b, a width of each of the two conveying belt is defined as c, a total width of the gob-side entry retaining end support is defined as L, and k+a+2b+2c=L; and a maximum offset between anchor rods or anchor cables of each row is defined as M, and M=k.

9. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 2, wherein, the each telescopic rod is a damping telescopic rod.

10. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 9, wherein, an expansion amount of a telescopic spring of the plurality of telescopic springs is defined as k, a length of the telescopic spring in an initial state is defined as a, a width of each of the two concave base plates is defined as b, a width of each of the two conveying belt is defined as c, a total width of the gob-side entry retaining end support is defined as L, and k+a+2b+2c=L; and a maximum offset between anchor rods or anchor cables of each row is defined as M, and M=k.

11. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 1, wherein, the each telescopic rod is a damping telescopic rod.

12. The apparatus for protecting the roof tray when the gob-side entry retaining end support migrates according to claim 11, wherein, an expansion amount of a telescopic spring is defined as k, a length of the telescopic spring in an initial state is defined as a, a width of each of the two concave base plates is defined as b, a width of each of the two conveying belt is defined as c, a total width of the gob-side entry retaining end support is defined as L, and k+a+2b+2c=L; and a maximum offset between anchor rods or anchor cables of each row is defined as M, and M=k.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic three-dimensional structural diagram of an apparatus of the present invention mounted on a hydraulic support.

(2) FIG. 2 is a schematic three-dimensional structural diagram of the present invention.

(3) FIG. 3 is a schematic partial enlarged diagram of a movable bearing mechanism at {circle around (1)} in FIG. 2.

(4) FIG. 4 is a schematic partial enlarged diagram of an active reset mechanism at {circle around (2)} in FIG. 2.

(5) FIG. 5 is a schematic partial enlarged diagram of a chamfer of an automatic expansion/contraction connecting groove mechanism at {circle around (3)} in FIG. 2.

(6) FIG. 6 is a schematic partial enlarged diagram of a telescopic spring of the automatic expansion/contraction connecting groove mechanism at {circle around (4)} in FIG. 2.

(7) FIG. 7 is a schematic partial enlarged diagram of a spherical hinge mechanism at {circle around (5)} in FIG. 2.

(8) In the figures: 1. fixed support; 2. reset spring; 3. telescopic rod; 4. belt; 5. roller; 6. anchor member; 7. telescopic spring; 8. concave base plate; 9. end hinge ball; and 10. bearing mechanism.

DETAILED DESCRIPTION

(9) The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.

(10) As shown in FIG. 1 to FIG. 7, an apparatus for protecting a roof tray when a gob-side entry retaining end support migrates is mounted at a top end position of a hydraulic support, and includes a movable bearing mechanism, an automatic expansion/contraction connecting groove mechanism, and an active reset mechanism. The movable bearing mechanism includes two parallel equal-length conveying belts 4 and several matched rollers 5 supporting the belts 4, and the rollers 5 are mounted on and supported by a bearing mechanism 10. The automatic expansion/contraction connecting groove mechanism is two concave base plates 8 fixed between the two belts 4, and the two concave base plates 8 are oppositely disposed and spaced by a distance. The active reset mechanism includes two telescopic rods 3 and reset springs 2 sleeved on the telescopic rods 3, the telescopic rod 3 is connected to an end portion of the reset spring 2 to form a synchronous mechanism, and the two both have one end connected to one side of the concave base plate 8 and the other end fixed at the end position of the hydraulic support through a fixed support 1.

(11) After the hydraulic support is lifted, a tray and some anchor cables or anchor rods that are exposed are embedded between the two concave base plates of the groove mechanism to form a gap, and an upper portion of the belt 4 is attached to the roof through a movable bearing mechanism. As the hydraulic support advances, the belt 4 drives, under backward friction of the roof and forward friction of the end support, the roller 5 to rotate, and the movable bearing mechanism drives the groove mechanism to move backwards relative to the hydraulic support at the same time, and stretches the reset spring 2 in the active reset mechanism. When the hydraulic support is relieved and contracts, and a top beam is lowered, friction between the movable bearing mechanism and the roof is eliminated, and the reset spring 2 in the active reset mechanism pulls the movable bearing mechanism and the groove mechanism to return under the action of resilience.

(12) Further, the two concave base plates 8 are connected through several telescopic springs 7, and the telescopic springs 7 are all anchored on the concave base plates 8 on two sides through an anchor member 6.

(13) Because the anchor rods or the anchor cables designed during early-stage reinforced shoring of the roadway are not all arranged according to a uniform standard, the tray and some anchor rob/anchor cable structures that are exposed are misaligned. The springs 7 between the concave base plates 8 can make the tray and some anchor robs/anchor cables that are exposed and that are misaligned accommodated in a protection scope, and a use scope of a protection mechanism is enlarged. Due to addition of the mechanism, the tray and some anchor rob/anchor cable structures that are exposed and that are misaligned can all be included in the protection scope, thereby providing an elastic telescopic buffer range for functioning of the whole apparatus.

(14) To ensure flexibility during expansion of the springs 7 between the concave base plates 8, the telescopic rod 3 is connected in a hinged manner to the fixed support 1 through an end hinge ball 9.

(15) To increase friction between the belt 4 and the roller 5, one surface of the belt 4 in contact with the roller 5 is provided with meshing teeth, and the roller 5 is a meshing roller matching the meshing teeth on the belt 4.

(16) The telescopic rod 3 is a damping telescopic rod, and when being reset, the damping telescopic rod may counteract a forward inertia force of the movable bearing mechanism and the groove mechanism and a contraction force of some springs, so that the apparatus can be reset better.

(17) Further, if an expansion amount of the telescopic spring 7 is defined as k, a length of the telescopic spring 7 in an initial state is a, a width of each concave base plate 8 is b, a width of each belt 4 is c, and a total width of the support is L, k+a+2b+2c=L. If a maximum offset between anchor rods or anchor cables of each row is defined as M, M=k.

(18) A working principle is as follows:

(19) The mechanism is mounted at the end position of the hydraulic support through the fixed support 1. Then, the tray and some anchor rods/anchor cables that are exposed are embedded into the groove mechanism capable of automatically expanding/contracting for connection. A supporting force of the support is transferred to the roof through the movable bearing mechanism, and an end support moves under pressure in a gate road. As the end support advances, the belt 4 of the movable bearing mechanism drives, under backward friction of the roof and forward friction of the end support, the roller 5 to rotate, and the movable bearing mechanism drives the groove mechanism to move backwards relative to the hydraulic support. At the same time, the reset spring 2 and the damping telescopic rod 3 in the automatic reset mechanism are expanded under a pulling force. When the reset spring of the automatic reset mechanism stretches to a maximum extension length of the spring, the end support is relieved, the top beam is lowered, and the reset spring 2 of the automatic reset mechanism contracts and pulls the movable bearing mechanism and the groove mechanism to move forwards. The damping telescopic rod 3 contracts as the reset spring 2 contracts, and counteracts the forward inertia force of the movable bearing mechanism and the groove mechanism capable of expanding/contracting for connection and the contraction force of some reset springs in time. The apparatus is reset.