Hydraulic support out-of-pit puller for fully mechanized coal mining face

Abstract

The utility model discloses a hydraulic support out of nest helping puller of fully mechanized coal face, including lever mechanism, lever mechanism is provided with: the first end point of the first push rod that is connected to the hydraulic support of being pulled. The lever fulcrum of the second push rod that is connected to the second hydraulic support adjacent to the hydraulic support of being pulled. The second end point of the third push rod that is connected to the third hydraulic support adjacent to the second hydraulic support. The hydraulic support of being pulled and third hydraulic support are respectively at the both sides of second hydraulic support. The utility model alleviates the labor intensity of worker, and the operation is safe, quick and labor saving.

Description

Technical Field

[0001] This utility model relates to an underground coal mining equipment and method, especially a hydraulic support puller for fully mechanized mining faces and a complete set of support retraction equipment. Background Technology

[0002] In underground longwall mining faces, when a face is completed and relocation is involved, the coal mining machine is usually withdrawn first, followed by the scraper conveyor, and finally the hydraulic supports. The hydraulic supports are arranged in a line at the face.

[0003] Before withdrawing the hydraulic support, it must first be moved to the lifting channel, i.e., the hydraulic support is removed from its socket.

[0004] In existing technology, the method for removing hydraulic supports from their sockets involves using a single prop with oblique support and remote hydraulic injection to push the support outwards. This process typically uses two single props: one prop is used for remote hydraulic injection to remove the support from its socket, while the other prop supports the rear of the support at an oblique angle (turning the hydraulic support parallel to the lifting channel) until it enters the lifting channel, at which point the support is officially lifted into the return tunnel. This process presents several safety risks: first, personnel may enter the working face (potential for injury from falling debris); second, manual operation of the single props is labor-intensive, involves numerous moves, and is inefficient.

[0005] Therefore, it is necessary to provide a convenient, labor-saving, and safe method for removing hydraulic supports from their sockets. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a hydraulic support puller for fully mechanized mining faces. It includes a lever mechanism, which is equipped with:

[0007] The first end of the first push rod is connected to the first end of the hydraulic support being pulled.

[0008] The lever fulcrum is connected to the second push rod of the second hydraulic support adjacent to the pulled hydraulic support.

[0009] The second end of the third push rod is connected to the third hydraulic support adjacent to the second hydraulic support.

[0010] The tensioned hydraulic support and the third hydraulic support are located on both sides of the second hydraulic support.

[0011] As mentioned above, in the hydraulic support puller for fully mechanized mining faces, the lever mechanism further includes:

[0012] A crossbar is perpendicular to the second push rod in the initial state and is located at the top of the second push rod; the middle section of the crossbar is hinged to the top of the second push rod at any position.

[0013] The main arm is inclined to the crossbar; the first end point is set at one end of the main arm, and the second end point is set at the other end of the main arm.

[0014] Support connecting rod, the support connecting rod is perpendicular to the crossbar.

[0015] The crossbar extends from the hinged end of the second push rod to both ends, with one end connected to the main arm and the other end connected to the main arm via a support connecting rod, so that the crossbar, support connecting rod, and main arm form a triangular stable structure.

[0016] As mentioned above, in the hydraulic support puller for a fully mechanized mining face, where L1 + L2 ≥ S,

[0017] L1 is the distance from the first endpoint to the connection point of the first push rod in the initial state;

[0018] L2 is the distance from the second endpoint to the connection point of the third push rod in the initial state;

[0019] Furthermore, the length of one or both of L1 and L2 can be adjusted between the maximum length and 0;

[0020] S represents the maximum stroke required for the support to leave the nest.

[0021] As mentioned above, in the hydraulic support puller for fully mechanized mining faces, one of L1 and L2 is 0.

[0022] As mentioned above, in the hydraulic support puller for fully mechanized mining faces, the length of one or both of L1 and L2 can be adjusted between the maximum length and 0, specifically as follows:

[0023] (1) The first end point and the first push rod connection point are connected by an iron chain; the second end point and the third push rod connection point are directly connected.

[0024] (2) The first end point is directly connected to the first push rod connection point, and the second end point is connected to the third push rod connection point by an iron chain;

[0025] (3) The connection between the first end point and the first push rod, and the connection between the second end point and the third push rod, are both connected by iron chains.

[0026] As mentioned above, in the hydraulic support puller for fully mechanized mining face, the direct connection specifically refers to the provision of a hinge seat on the lever mechanism, which is hinged to the pin hole at the front end of the first or third push rod.

[0027] As mentioned above, in the hydraulic support puller for fully mechanized mining faces, when using iron chains for connection, a chain support is provided at the connection point with the iron chain, which can anchor any link of the iron chain to the chain support.

[0028] Beneficial technical effects:

[0029] This utility model relates to a hydraulic support puller for fully mechanized mining faces. It features a simple structure, convenient underground transport, easy assembly, and flexible operation. The hydraulic support being pulled relies on an adjacent hydraulic support as the fulcrum of the connecting booster's shaft. Utilizing the lever principle, the puller fully leverages the retracting force of the piston rod of the push rod cylinder to pull the hydraulic support out of the machine slot and adjust its direction to enter the hoisting channel. This reduces the labor intensity of workers and ensures safe, quick, and labor-saving operation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the installation structure of the bracket release aid and hydraulic support of this utility model.

[0031] Figure 2 for Figure 1 This is a structural diagram of the bracket puller of this utility model.

[0032] Figure 3 This is a schematic diagram of the installation structure of the bracket release aid and hydraulic support, which is another example.

[0033] Figure 4 This is a schematic diagram of the operation of this utility model.

[0034] Among them: first push rod 1; second push rod 2; third push rod 3; pulled hydraulic support 4; second hydraulic support 5; third hydraulic support 6; first end point 7; second end point 8; lever fulcrum 9; main arm 10; crossbar 11; support connecting rod 12; cable 13; iron chain 14; lifting channel 16; winch 15. Detailed Implementation

[0035] Next, through the appendix Figure 1-4 The present invention will be described by way of example.

[0036] Among them, the underground fully mechanized mining face is a fully mechanized coal mining face.

[0037] refer to Figure 4 The hoisting passage 16 is located at or parallel to the coal face, after the coal mining machine and scraper conveyor have been withdrawn. It is situated between the pulled hydraulic support 4 and the withdrawal roadway.

[0038] The hydraulic support 4 and the third hydraulic support 6 are located on both sides of the second hydraulic support 5.

[0039] The winch is located at exit 16 of the hoisting channel.

[0040] Each hydraulic support has a push rod mounted on the base, facing forward, operating on the principle of a hydraulic jack, and is extendable by hydraulic force. The push rod has a pin hole at its front end, originally intended for connecting to a scraper conveyor.

[0041] The hydraulic supports at the working face are arranged in a stepping pattern, with the lower support base lagging behind the upper support base.

[0042] Example 1: Hydraulic support puller for fully mechanized mining face.

[0043] refer to Figure 1-2 The present invention relates to a hydraulic support puller for fully mechanized mining faces, the main body of which is a lever mechanism, constructed by welding together I-beams, angle steel, and square steel. The lever mechanism includes a first end point 7 connected to the first push rod 1 of the hydraulic support 4 being pulled; a lever fulcrum 9 connected to the second push rod 2 of the second hydraulic support 5 adjacent to the hydraulic support 4 being pulled; and a second end point 8 connected to the third push rod 3 of the third hydraulic support 6 adjacent to the second hydraulic support 5. The hydraulic support 4 being pulled and the third hydraulic support 6 are located on opposite sides of the second hydraulic support 5.

[0044] In one example, the main arm 10 is inclined to the crossbar 11, with one end of the main arm 10 being the first endpoint 7 and the other end being the second endpoint 8.

[0045] The crossbar 11 is perpendicular to the second push rod 2. At this time, the second hydraulic support 5 is still in its initial state, that is, it has not moved yet. There is a hinge seat approximately in the middle of the crossbar 11. The top of the second push rod 2 is hinged to this hinge seat to form a lever fulcrum 9.

[0046] The length of the crossbar 11 is as follows: the second end of the crossbar 11 is hinged to the second end point 8 on the third push rod 3, and the first end of the crossbar 11 is located on the adjacent side of the hydraulic support 4 and the second hydraulic support 5. Alternatively, the length of the crossbar 11 can be understood as being approximately 1.5 times the width of the hydraulic support base.

[0047] The crossbar 11 extends from the hinge point at the top of the second push rod 2 to both ends, with the two ends being the first end and the second end of the crossbar 11, respectively.

[0048] The second end of the crossbar 11, together with the second end of the main arm 10, forms a common end. The common end is hinged to the second end point 8 of the third push rod 3 through a hinge seat, forming a direct connection.

[0049] The first end of the crossbar 11 is connected to the main arm 10 via a supporting connecting rod 12, which is perpendicular to the crossbar 11. This forms a triangular stable structure with the crossbar 11, the supporting connecting rod 12, and the main arm 10.

[0050] One end of the main arm 10 (first end point 7) is connected to the first push rod 1 of the hydraulic support 4 being pulled by an iron chain 14. A chain support is provided on the first end point 7, which can anchor any ring of the iron chain 14 to the chain support. A chain support is also provided on the first push rod 1, which can anchor any ring of the iron chain 14 to the chain support.

[0051] Since the first end of the crossbar 11 is located adjacent to the hydraulic support 4 being pulled and the second hydraulic support 5, the crossbar 11 will not obstruct the hydraulic support 4 being pulled when it moves forward.

[0052] Since the first end point 7 of the lever is in front of the hydraulic support 4 being pulled, to prevent obstructing the movement of the hydraulic support 4, the length of the chain 14 can be shortened after the hydraulic support 4 has traveled a certain distance. The length of the chain 14, that is, the distance from the first end point 7 to the top of the first push rod 1, is greater than the maximum stroke required for the support to exit the socket, and the formula is as follows:

[0053] Let L1 + L2 ≥ S, where L1 is the distance from the first endpoint 7 to the connection point of the first push rod 1 in the initial state; L2 is the distance from the second endpoint 8 to the connection point of the third push rod 3 in the initial state. The length of one or both of L1 and L2 can be adjusted between the maximum length and 0; the maximum length is the distance between the main arm 10 and the first endpoint 7 in the initial state. S is the maximum stroke required for the support to leave the nest. One of L1 and L2 is 0.

[0054] In this example, since the second end of the crossbar 11 and the second end of the main arm 10 together form a common end, which is hinged to the second end point 8 of the third push rod 3, L2 can be considered to be 0. Therefore, L1 must be greater than S. At this time, S is the length of the chain 14, which is the distance from the first end point 7 to the top of the first push rod 1. The length of the chain 14 must be greater than the maximum stroke required for the support to leave the nest.

[0055] In this example, the chain 14 can also be installed between the second end point 8 and the third push rod 3 connection point, while the first end point 7 and the first push rod 1 connection point are directly connected (hinged), and the principle is basically the same.

[0056] Example 2: Hydraulic support puller for fully mechanized mining face.

[0057] The hydraulic support puller for fully mechanized mining faces of this utility model is mainly a lever mechanism, which is constructed by welding I-beams, angle steel, square steel, etc. The lever mechanism is provided with a first end point 7 connected to the first push rod 1 of the hydraulic support being pulled 4; a lever fulcrum 9 connected to the second push rod 2 of the second hydraulic support 5 adjacent to the hydraulic support being pulled 4; and a second end point 8 connected to the third push rod 3 of the third hydraulic support 6 adjacent to the second hydraulic support 5. The hydraulic support being pulled 4 and the third hydraulic support 6 are respectively located on both sides of the second hydraulic support 5.

[0058] refer to Figure 3 In one example, the lever mechanism includes a main arm 10. In the initial state, the main arm 10 is perpendicular to the first push rod 1. A triangular structure is set in the middle of the main arm 10, with the main arm 10 forming one side of this triangular structure. The other two sides of the triangular structure are connected to the main arm 10 on the left and right sides, respectively. The other two sides intersect at the second push rod 2, serving as the lever fulcrum 9, where a hinge is set. The lever fulcrum 9 is hinged to the second push rod 2, i.e., directly connected.

[0059] The main arm 10 has two ends, namely the first end point 7 and the second end point 8, and each end point is connected to the first push rod 1 and the third push rod 3 by a chain 14. The main arm 10 has chain supports at both ends, which can anchor any loop of the chain 14 to the chain support.

[0060] To prevent obstructing the movement of the hydraulic support 4, the length of the chain 14 can be shortened after the hydraulic support 4 has traveled a certain distance. The length of the chain 14, that is, the distance from the first end point 7 to the top of the first push rod 1, is greater than the maximum stroke required for the support to exit the socket, and the formula is as follows:

[0061] Let L1 + L2 ≥ S, where L1 is the distance from the first endpoint 7 to the connection point of the first push rod 1 in the initial state; and L2 is the distance from the second endpoint 8 to the connection point of the third push rod 3 in the initial state. The lengths of L1 and L2 can be adjusted between the maximum length and 0. The maximum length is the distance between the main arm 10 and the first endpoint 7 and the second endpoint 8 in the initial state, and between the first push rod 1 and the third push rod 3, respectively.

[0062] S represents the maximum stroke required for the stent to exit the nest. One of L1 and L2 is 0.

[0063] In this example, the two ends of the main arm 10 are the first endpoint 7 and the second endpoint 8, respectively, and each is connected to the first push rod 1 and the third push rod 3 by an iron chain 14. Therefore, it can be considered that L1 = L2 > 0, so L1 + L2 must be greater than S. At this time, S is the length of the two iron chains 14 added together. If this condition is met, the main arm 10 will not obstruct the walking direction of the hydraulic support 4 being pulled.

[0064] Example 4: The method for installing anchors on fully mechanized mining face supports is as follows (refer to the following). Figure 4 :

[0065] Preliminary preparations:

[0066] To prevent rock spillage above the hydraulic supports and roof collapse and breakage, the hydraulic supports at the working face are automatically replenished with hydraulic fluid to support the roof. The side guards of the hydraulic supports are also opened as much as possible to adjust the misalignment distance and reduce rockfall from the roof beams.

[0067] Remove the working face support frame and raise the bottom support plate.

[0068] The No. 1 hydraulic support (the lowest hydraulic support, i.e., the first hydraulic support to be withdrawn) is difficult to withdraw as a whole. It is necessary to clear the loose coal below and pull the support to the top to stabilize it.

[0069] Step 1: Install the lever mechanism:

[0070] The lever fulcrum 9 is hinged to the second push rod 2 of the second hydraulic support 5.

[0071] Connect the first end point 7 to the first push rod 1 of the hydraulic support 4 being pulled; connect the second end point 8 to the third push rod 3 of the third hydraulic support 6;

[0072] The first end point 7 is connected to the first push rod 1 of the hydraulic support 4 being pulled, and the second end point 8 is connected to the third push rod 3 of the third hydraulic support 6, at least one of which is connected by a chain 14, with the chain 14 tensioned and anchored to the chain support. Preferably, the first end point 7 is connected to the first push rod 1 of the hydraulic support 4 by the chain 14, and the second end point 8 is hinged to the third push rod 3.

[0073] Step 2: Install the winch for traction.

[0074] A chamber is excavated at the exit of the hoisting channel 16, and a winch is installed. The cable 13 of the winch 15 is connected to the top plate of the hydraulic support 4 to prevent the hydraulic support 4 from tipping over during movement.

[0075] Before retracting the hydraulic support, first use a rope to secure the hydraulic support 4 to the bottom of the two columns, and then connect it to the winch cable 13 using a shackle. Afterwards, tighten the winch cable 13 to apply appropriate force and prevent the hydraulic support from tipping over. Before the retraction operation, the emulsifying pump must be stopped at the working face, the shut-off valve closed, the residual pressure in the pipeline released, and all hydraulic connection pipelines and anti-tipping / anti-slip hydraulic cylinders disconnected.

[0076] Step 3: Connect the hydraulic cylinder inside the third push rod 3 to the hydraulic pipe and connect it to the hydraulic valve group. Lower the hydraulic support 4 to be pulled down by about 300mm. The hydraulic cylinder of the third push rod 3 returns fluid, causing the third push rod 3 to retract inward.

[0077] The second push rod 2 remains stationary, and the lever fulcrum 9 is fixed, causing the lever mechanism to rotate around the lever fulcrum 9. Using the lever principle, the hydraulic support 4 to be pulled out of its socket is drawn. When the hydraulic cylinder of the third push rod 3 returns fluid, causing the third push rod 3 to retract inward to its initial position, fluid is then injected into the cylinder of the third push rod 3, causing the third push rod 3 to extend outward to its maximum position. The chain 14 at the connection point is removed from the chain support, and after being retightened, it is anchored back onto the chain support. The hydraulic cylinder of the third push rod 3 returns fluid again, causing the third push rod 3 to retract inward, continuing to pull the hydraulic support 4 to be pulled. The steps of "returning fluid to the third push rod cylinder → extending with oil → retightening the chain 14 → retracting and pulling again" are repeated until the hydraulic support 4 to be pulled out of its socket.

Claims

1. A hydraulic support puller for fully mechanized mining faces, characterized in that, Including a leverage mechanism, which includes: The first end of the first push rod connected to the first hydraulic support being pulled; The lever fulcrum is connected to the second push rod of the second hydraulic support adjacent to the pulled hydraulic support; The second end of the third push rod is connected to the third hydraulic support adjacent to the second hydraulic support; The tensioned hydraulic support and the third hydraulic support are located on both sides of the second hydraulic support.

2. The hydraulic support out-of-gob assisting puller of the fully-mechanized coal mining face according to claim 1, characterized in that, The lever mechanism also includes: A crossbar is perpendicular to the second push rod in the initial state and is located at the top of the second push rod; the middle section of the crossbar is hinged to the top of the second push rod at any position. The main arm is inclined to the crossbar; the first end point is set at one end of the main arm, and the second end point is set at the other end of the main arm. Support connecting rod, the support connecting rod is perpendicular to the crossbar; The crossbar extends from the hinged end of the second push rod to both ends, with one end connected to the main arm and the other end connected to the main arm via a support connecting rod, so that the crossbar, support connecting rod, and main arm form a triangular stable structure.

3. The hydraulic support puller for fully mechanized mining faces as described in claim 1, characterized in that, Make L1 + L2 ≥ S, L1 is the distance from the first endpoint to the connection point of the first push rod in the initial state; L2 is the distance from the second endpoint to the connection point of the third push rod in the initial state; Furthermore, the length of one or both of L1 and L2 can be adjusted between the maximum length and 0; S represents the maximum stroke required for the support to leave the nest.

4. The hydraulic support puller for fully mechanized mining faces as described in claim 3, characterized in that, One of L1 and L2 is 0.

5. The hydraulic support puller for fully mechanized mining faces as described in claim 3, characterized in that, The length of one or both of L1 and L2 can be adjusted between the maximum length and 0. Specifically, the connection between the first endpoint and the first push rod connection point, and the connection between the second endpoint and the third push rod connection point, are both connected by iron chains.

6. The hydraulic support puller for fully mechanized mining faces as described in claim 3, characterized in that, The length of one or both of L1 and L2 can be adjusted between the maximum length and 0. Specifically, the first end point is connected to the first push rod connection point by an iron chain; the second end point is directly connected to the third push rod connection point.

7. The hydraulic support puller for fully mechanized mining faces as described in claim 3, characterized in that, The length of one or both of L1 and L2 can be adjusted between the maximum length and 0. Specifically, the first end point is directly connected to the first push rod connection point, and the second end point is connected to the third push rod connection point by an iron chain.

8. The hydraulic support puller for fully mechanized mining face as described in any one of claims 6-7, characterized in that, The direct connection specifically refers to the provision of a hinge seat on the lever mechanism, which is hinged to the pin hole at the front end of the first or third push rod.

9. The hydraulic support puller for fully mechanized mining faces as described in any one of claims 5-7, characterized in that, When using iron chains for connection, a chain support is provided at the connection point with the iron chain, which can anchor any link of the iron chain to the chain support.

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