Bottom lifting mechanism for forepoling

Abstract

The utility model relates to a forepoling bottom lifting mechanism which comprises bottom lifting rocker arms located on the two sides of a support base, one end of each bottom lifting rocker arm is hinged to the support base, the two sides of the support base are further connected with jacks for driving the bottom lifting rocker arms to swing up and down, and telescopic shafts of the jacks face downwards and are fixedly connected with driving pin shafts. The bottom lifting rocker arm is provided with a long hole allowing the driving pin shaft to be inserted therein, the two sides of the support base are each fixedly connected with two installation lug plates, the jack is located between the two installation lug plates, the jack is hinged to the installation lug plates, and a hinge shaft is perpendicular to a hinge shaft of the bottom lifting rocker arm and the support base. According to the bottom lifting device, the support base can be lifted upwards, a hole for connecting the jack and the bottom lifting rocker arm is a long hole, so that the jack is kept in a vertical state in the swinging process of the bottom lifting rocker arm, bottom pricking of the base can be effectively improved, and conditions are provided for smooth pushing of the forepoling under the condition of a soft bottom plate.

Description

Technical Field

[0001] The utility model relates to the technical field of advanced supports, in particular to a floor lifting mechanism of an advanced support. Background Art

[0002] The roadway advanced hydraulic support is a support designed according to the advancement of the loading machine in the crossheading of the fully mechanized coal mining face. However, the geological conditions of the coal mining face underground are ever-changing. In some fully mechanized coal mining faces, the floor is mainly composed of mudstone. When the mudstone encounters water, it swells and softens, causing the base of the hydraulic support to sink and the base of the support to sink into the mud, seriously affecting the advancement speed of the advanced support and the roof support, and bringing great difficulties to the safe production of coal mines. Therefore, it is necessary to install a floor lifting mechanism of the advanced support to lift the base of the advanced support. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides an advanced support floor lifting mechanism with simple form, reliable structure, large floor lifting force and small installation space.

[0004] The utility model is realized through the following technical solutions. An advanced support floor lifting mechanism is provided, which includes floor lifting rocker arms located on both sides of the support base. One end of the floor lifting rocker arm is hinged to the support base. Jacks for driving the floor lifting rocker arms to swing up and down are also connected to both sides of the support base. The telescopic shaft of the jack faces downward and is fixedly connected with a driving pin shaft. A long hole for inserting the driving pin shaft is opened on the floor lifting rocker arm.

[0005] As an optimization, two mounting ear plates are fixedly connected to both sides of the support base respectively. The jack is located between the two mounting ear plates. The jack is hinged to the mounting ear plates, and the hinge shaft is perpendicular to the hinge shafts of the floor lifting rocker arm and the support base.

[0006] As an optimization, a jack pin shaft is fixedly connected to the side of the jack. A sunk groove for accommodating the jack pin shaft is opened on the side of the mounting ear plate. A stop block is detachably fixedly connected to the notch of the sunk groove.

[0007] As an optimization, a stop block pin shaft passing through the stop block is vertically penetrated on the mounting ear plate.

[0008] As an optimization, the floor lifting rocker arm includes a bottom plate and two parallel connecting vertical plates fixedly connected to the bottom plate. The long hole penetrates through the two connecting vertical plates. One end of the connecting vertical plate is provided with a hinge connecting hole for hinging with the support base.

[0009] As an optimization, one end of the bottom plate far from the hinge connecting hole is bent upward, and a reinforcing rib plate is welded to the upper end surface of the bent part.

[0010] As an optimization, a second reinforcing plate is welded to the side of the connecting vertical plate in a fitting manner. The long hole penetrates through the second reinforcing plate.

[0011] As an optimization, a first reinforcing plate is welded to one side of the connecting vertical plate in a fitting manner, and the hinge connection hole passes through the first reinforcing plate.

[0012] The beneficial effects of the present utility model are as follows: For the bottom-lifting mechanism of the advanced support of the present utility model, by swinging the bottom-lifting rocker arm downward, the upward lifting of the support base can be achieved. The hole where the jack is connected to the bottom-lifting rocker arm is an elongated hole, so as to ensure that the jack remains vertical during the swinging process of the bottom-lifting rocker arm. The present utility model can effectively improve the problem of the base sinking into the ground, and provide conditions for the smooth pushing of the advanced support under the condition of soft floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the front view of the present utility model;

[0014] Figure 2 is the front view of the present utility model in the lifted state;

[0015] Figure 3 is the top view of the present utility model;

[0016] Figure 4 is the side view of the present utility model;

[0017] Figure 5 is the front view of the bottom-lifting rocker arm of the present utility model;

[0018] Figure 6 is the top view of the bottom-lifting rocker arm of the present utility model;

[0019] As shown in the figure:

[0020] 1. Support base, 2. Bottom-lifting rocker arm, 21. Elongated hole, 22. Floor, 23. Connecting vertical plate, 24. Reinforcing rib plate, 25. First reinforcing plate, 26. Second reinforcing plate, 27. Hinge connection hole, 3. Jack, 4. Mounting ear plate, 41. Stopper, 42. Stopper pin shaft, 5. Driving pin shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To clearly illustrate the technical features of this solution, the following is an elaboration of this solution through specific embodiments.

[0022] As Figures 1 - 6 shown, a bottom-lifting mechanism of an advanced support of the present utility model includes bottom-lifting rocker arms 2 located on both sides of the support base 1. One end of the bottom-lifting rocker arm 2 is hinged to the support base 1, and the hinge axis is perpendicular to the side surface of the support base 1, so that the bottom-lifting rocker arm 2 can swing up and down in contact with the side surface of the support base 1. The bottom-lifting rocker arm 2 is in a long strip shape. When not lifting the bottom, the lower end surface of the bottom-lifting rocker arm 2 is flush with the lower end surface of the support base 1. When lifting the bottom, the bottom-lifting rocker arm 2 swings downward, thereby lifting the support base 1 upward.

[0023] AsFigure 5 , 6 As shown in 6 , the bottom-lifting rocker arm 2 includes a bottom plate 22 and two parallel connecting vertical plates 23 fixedly connected to the bottom plate 22. One end of the connecting vertical plate 23 is provided with a hinge connection hole 27 for hinging with the support base 1. The hinge connection with the bottom-lifting rocker arm 2 is achieved by passing a pin through the hinge connection hole 27. To improve the strength at the hinge connection hole 27, a first reinforcing plate 25 is welded in a fitting manner on one side of the connecting vertical plate 23, and the hinge connection hole 27 passes through the first reinforcing plate 25.

[0024] One end of the bottom plate 22 away from the hinge connection hole 27 is bent upward, so that when this end swings downward, it maintains a large contact area with the ground, and a reinforcing rib plate 24 is welded on the upper end surface of the bent part to strengthen the bent part and prevent deformation under force.

[0025] On both sides of the support base 1, there are also connected jacks 3 for driving the bottom-lifting rocker arm 2 to swing up and down. The jack 3 is a hydraulic cylinder and is arranged vertically. The telescopic shaft of the jack 3 faces downward and is fixedly connected with a driving pin 5. A long hole 21 for inserting the driving pin 5 is opened on the bottom-lifting rocker arm 2. The long hole 21 passes through the two connecting vertical plates 23. To improve the strength at the vertical plate 23, a second reinforcing plate 26 is welded in a fitting manner on one side of the connecting vertical plate 23, and the long hole 21 passes through the second reinforcing plate 26.

[0026] To realize the installation of the jack, two mounting ear plates 4 are fixedly connected to both sides of the support base 1 respectively. The jack 3 is located between the two mounting ear plates 4. A jack pin is fixedly connected to the side of the jack 3, and the jack pin is respectively rotatably connected to the two mounting ear plates 4, thus realizing the hinge connection between the jack 3 and the mounting ear plates 4, and the hinge axis is perpendicular to the hinge axis of the bottom-lifting rocker arm 2 and the support base 1, so that the jack 3 can swing left and right to a certain extent to adapt to the installation error, and at the same time ensure that the driving pin 5 can effectively fit with the long holes 21 on the two connecting vertical plates 23. The jack 3 swings left and right, which is convenient for arranging the mounting ear plates 4 and reduces the overall left-right space at the same time.

[0027] To realize the disassembly, assembly and hinge of the jack 3 and facilitate the installation of the jack pin on the mounting ear plate 4, as Figure 4 shown, a sunk groove for accommodating the jack pin is opened on the side surface of the mounting ear plate 4. The bottom of the sunk groove is semicircular. After the jack pin is placed in the sunk groove, it fits with the semicircular ground. To prevent the jack pin from coming out, a stop block 41 is detachably fixedly connected to the notch of the sunk groove. The side of the stop block 41 close to the jack pin is arc-shaped and fits with the jack pin, thus realizing the rotational connection of the jack pin.

[0028] To realize the detachable fixed connection of the stop block 41, a stop block pin 42 passing through the stop block 41 is vertically penetrated on the mounting ear plate 4.

[0029] Usage method of the utility model:

[0030] The lifting rocker arms 2 on both sides of the support base 1 swing up and down respectively through jacks. When swinging downwards, they swing below the support base 1, thereby lifting the support base 1 upwards. The jacks on the left and right sides are controlled by a group of control valves, and the functions of simultaneous control and simultaneous bottom lifting of the left and right jacks can be achieved.

[0031] Certainly, the above description is not limited to the above examples. The technical features not described in the present utility model can be realized by or adopted from the prior art, and will not be elaborated here. The above embodiments and drawings are only used to illustrate the technical solutions of the present utility model and are not limitations to the present utility model. The present utility model has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present utility model do not depart from the purpose of the present utility model and should also fall within the scope of the claims of the present utility model.

Claims

1. An underframe lifting mechanism for a front support, characterized in that: It includes lifting bottom rocker arms (2) located on both sides of the support base (1). One end of the lifting bottom rocker arm (2) is hinged to the support base (1). Jacks (3) for driving the lifting bottom rocker arms (2) to swing up and down are also connected to both sides of the support base (1). The telescopic shaft of the jack (3) faces downward and is fixedly connected with a driving pin shaft (5). A long hole (21) for inserting the driving pin shaft (5) is formed on the lifting bottom rocker arm (2).

2. The under-lifting mechanism of the advanced support according to claim 1, characterized in that: Two mounting ear plates (4) are fixedly connected to both sides of the support base (1) respectively. The jack (3) is located between the two mounting ear plates (4). The jack (3) is hinged to the mounting ear plate (4), and the hinge axis is perpendicular to the hinge axis of the lifting bottom rocker arm (2) and the support base (1).

3. The under-lifting mechanism of the advanced support according to claim 2, characterized in that: A jack pin shaft is fixedly connected to the side of the jack (3). A sunk groove for accommodating the jack pin shaft is formed on the side of the mounting ear plate (4). A stop block (41) is detachably fixedly connected to the notch of the sunk groove.

4. The underframe lifting mechanism of the advanced support according to claim 3, characterized in that: A stop block pin shaft (42) passing through the stop block (41) is vertically penetrated on the mounting ear plate (4).

5. The under-lifting mechanism of the advanced support according to claim 1, characterized in that: The lifting bottom rocker arm (2) includes a bottom plate (22) and two parallel connecting vertical plates (23) fixedly connected to the bottom plate (22). The long hole (21) passes through the two connecting vertical plates (23). A hinge connection hole (27) for hinging with the support base (1) is formed at one end of the connecting vertical plate (23).

6. The underframe lifting mechanism of the advanced support according to claim 5, characterized in that: One end of the bottom plate (22) far from the hinge connection hole (27) is bent upward, and a reinforcing rib plate (24) is welded to the upper end surface of the bending part.

7. The under-lifting mechanism of the advanced support according to claim 5, characterized in that: A second reinforcing plate (26) is welded to one side of the connecting vertical plate (23) in a fitting manner. The long hole (21) passes through the second reinforcing plate (26).

8. The under-lifting mechanism of the advanced support according to claim 5, characterized in that: A first reinforcing plate (25) is welded to one side of the connecting vertical plate (23) in a fitting manner. The hinge connection hole (27) passes through the first reinforcing plate (25).

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