Strong magnetic hedging suspension anti-impact stand column structure

Abstract

The invention discloses a strong magnetic hedging suspension anti-impact stand column structure which comprises a hydraulic cylinder and a movable column, one end of the movable column extends into the hydraulic cylinder and is fixedly connected with a main piston of the hydraulic cylinder, a movable strong magnetic block is installed on the main piston, and a fixed strong magnetic block matched with the movable strong magnetic block is installed on the side, away from the movable column, in the hydraulic cylinder. An overflow device is arranged on the fixed strong magnetic block; a strong magnetic structure is additionally arranged in a stand column structure, stand column supporting is achieved through the simultaneous action of hydraulic supporting and magnetic force hedging, in the normal mining process, the strong magnetic structure is only used as an auxiliary support, and the hydraulic structure is used as a main support; by means of the characteristics of continuity and instantaneous compression of the magnetic hedging structure, the stand column is compressed and buffered, meanwhile, the magnetic structure can instantaneously generate counter-acting force, it can be guaranteed that the stand column structure is not damaged, meanwhile, it can be guaranteed that supporting is stable, enough escape space is reserved, and therefore the safety of personnel in an operation site is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of mine hydraulic supports, and in particular to a strong magnetic counter-flush suspension anti-impact column structure. Background Art

[0002] At present, almost all the supports used in mine mining are hydraulic columns as the support body, and an emulsion pump is used to transport the emulsion into the column structure as the carrier for the support of the support. This structure can basically meet the resistance to the pressure from the self-weight of the roof rock and the rock tension released from the floor during mining. However, in a rock burst mine, the roof rock beam may break at any time to generate a strong dynamic load. Compared with the instantaneity of the strong impact and the unloading time of the column structure, the hydraulic support column cannot unload immediately to resist the impact force during the occurrence of the strong dynamic load, resulting in the damage of the rigid column structure and the destruction of the support.

[0003] At present, the method of using the hydraulic support for working face support and the advanced support of the two crosshead roadways of the working face has been used very maturely in China. The fully mechanized coal mining technology has developed very rapidly, and now the intelligent electro-hydraulic controlled fully mechanized coal mining working face is gradually mature and popularized. However, the performance of this support in resisting impact is weak. When an instantaneous impact occurs on the roof and floor of the roadway, the safety overflow valve cannot be started instantaneously and cannot unload quickly, resulting in the breakage of the hydraulic column or the penetration of the roof beam, and it cannot play a role in protecting the mining roadway and the evacuation route during the impact. After a rock burst occurs, the instantaneous impact on the roof causes the hydraulic column of the support to not unload instantaneously, resulting in the bending of the column and the damage of the cylinder block.

[0004] At present, the safety valve applied to the hydraulic support column has a maximum overflow flow rate of 2000 ml / min, and can only play a role in pressure boosting and unloading when the roof slowly sinks or the floor slowly rises. Compared with the instantaneity of the occurrence of rock bursts, the current market safety overflow valve cannot achieve rapid unloading to achieve the purpose of constant resistance and protecting the support structural parts. The column equipped with the safety overflow valve currently cannot achieve the instantaneous unloading function. When a rock burst occurs, the support column is damaged and cannot play a role in supporting the roof, and does not have the safety support ability. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a strong magnetic counter-flush suspension anti-impact column structure.

[0006] To solve the above technical problems, the technical solution of the present invention is: a strong magnetic counter-flush suspension impact-resistant column structure, including a hydraulic cylinder and a movable column. One end of the movable column extends into the hydraulic cylinder and is fixedly connected to the main piston of the hydraulic cylinder. A movable strong magnetic block is installed on the main piston. On the side of the hydraulic cylinder far from the movable column, a fixed strong magnetic block cooperating with the movable strong magnetic block is installed. Along the movement direction of the main piston, the movable strong magnetic block and the fixed strong magnetic block are located on both sides of the hydraulic cavity of the hydraulic cylinder. An overflow device for relieving pressure on the hydraulic cavity is provided on the fixed strong magnetic block.

[0007] Optionally, a first limit ring groove cooperating with the main piston is provided on the cylinder block of the hydraulic cylinder, and a first limit ring extending into the first limit ring groove is provided on the main piston.

[0008] Optionally, a second limit ring groove cooperating with the fixed strong magnetic block is provided on the cylinder block of the hydraulic cylinder, and a second limit ring extending into the second limit ring groove is provided on the fixed strong magnetic block.

[0009] Optionally, a first sealing ring is installed between the movable column and the cylinder block of the hydraulic cylinder.

[0010] Optionally, the overflow device includes an overflow cavity provided in the fixed strong magnetic block and communicating with the hydraulic cavity. A secondary piston is installed in the overflow cavity. One end of the secondary piston far from the hydraulic cavity is fixedly connected to the hydraulic cylinder through an elastic component. A gap is left between the secondary piston and the fixed strong magnetic block. An overflow hole is provided on the cylinder block of the hydraulic cylinder, and an overflow channel communicating the overflow cavity and the overflow hole is provided on the fixed strong magnetic block. A second sealing ring is provided between the end of the secondary piston close to the hydraulic cavity and the fixed strong magnetic block.

[0011] Optionally, the secondary piston extends axially towards the main piston in the overflow cavity, and the end face of the secondary piston facing the main piston is not higher than the end face of the fixed strong magnetic block facing the main piston.

[0012] Optionally, the elastic component includes an elastic cushion block installed between the secondary piston and the hydraulic cylinder.

[0013] Optionally, the elastic component includes a spring installed between the secondary piston and the hydraulic cylinder.

[0014] Optionally, a safety valve communicating with the hydraulic cavity is installed on the cylinder block of the hydraulic cylinder.

[0015] Optionally, the end face of the movable strong magnetic block facing the fixed strong magnetic block is a convex surface, and the end face of the fixed strong magnetic block facing the movable strong magnetic block is a concave surface.

[0016] The beneficial effects of this application are:

[0017] A strong magnetic counter - impact suspension anti - impact column structure described in this application includes a hydraulic cylinder and a movable column. One end of the movable column extends into the hydraulic cylinder and is fixedly connected to the main piston of the hydraulic cylinder. A movable strong magnetic block is installed on the main piston. On the side of the hydraulic cylinder far from the movable column, a fixed strong magnetic block cooperating with the movable strong magnetic block is installed. Along the movement direction of the main piston, the movable strong magnetic block and the fixed strong magnetic block are located on both sides of the hydraulic cavity of the hydraulic cylinder. An overflow device for relieving pressure on the hydraulic cavity is provided on the fixed strong magnetic block. By adding a strong magnetic structure to the column structure and using the simultaneous action of hydraulic support and magnetic force counter - impact to meet the column support, during normal mining, the strong magnetic structure only serves as an auxiliary support, and the hydraulic structure serves as the main support. However, when the strong impact dynamic load instantaneously compresses the column structure, the continuous and instantaneously compressible characteristics of the magnetic force counter - impact structure are utilized to enable the column to perform compression buffering. At the same time, the magnetic force structure can instantaneously generate a reaction force, which can not only ensure that the column structure is not damaged but also ensure stable support and leave enough escape space, thereby protecting the safety of personnel at the operation site. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are only intended to illustrate and explain the present invention and do not limit the scope of the present invention. Among them:

[0019] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of the pressure - relief state when the embodiment of the present invention is subjected to a strong impact dynamic load;

[0021] Figure 3 is a schematic structural diagram of the state after the pressure - relief is completed and the component returns to its original position in the embodiment of the present invention.

[0022] In the figure: 11 - hydraulic cylinder; 12 - overflow hole; 13 - hydraulic cavity; 21 - movable column; 22 - first sealing ring; 31 - main piston; 32 - movable strong magnetic block; 33 - first limiting ring; 34 - first limiting ring groove; 41 - fixed strong magnetic block; 42 - second limiting ring; 43 - second limiting ring groove; 44 - overflow cavity; 45 - overflow channel; 51 - auxiliary piston; 52 - elastic component; 6 - second sealing ring; 7 - safety valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims.

[0024] As Figures 1 to 3 shown, a strong magnetic counter - impact suspension anti - impact column structure includes a hydraulic cylinder 11 and a movable column 21. One end of the movable column 21 extends into the hydraulic cylinder 11 and is fixedly connected to the main piston 31 of the hydraulic cylinder 11. The main piston 31 pushes the movable column 21 to act to complete the support state of the bracket, and it is the working main piston 31 of the column. A moving strong magnetic block 32 is installed on the main piston 31, and a fixed strong magnetic block 41 that cooperates with the moving strong magnetic block 32 is installed on the side of the hydraulic cylinder 11 far from the movable column 21. Along the movement direction of the main piston 31, the moving strong magnetic block 32 and the fixed strong magnetic block 41 are located on both sides of the hydraulic chamber 13 of the hydraulic cylinder 11, and an overflow device for relieving pressure on the hydraulic chamber 13 is provided on the fixed strong magnetic block 41.

[0025] Furthermore, a first limit ring groove 34 that cooperates with the main piston 31 is provided on the cylinder block of the hydraulic cylinder 11, and a first limit ring 33 that extends into the first limit ring groove 34 is provided on the main piston 31. The cooperation between the first limit ring 33 and the first limit ring groove 34 can limit the formation of the main piston 31 and at the same time limit the stroke of the moving strong magnetic block 32 fixedly connected to the main piston 31.

[0026] Furthermore, a second limit ring groove 43 that cooperates with the fixed strong magnetic block 41 is provided on the cylinder block of the hydraulic cylinder 11, and a second limit ring 42 that extends into the second limit ring groove 43 is provided on the fixed strong magnetic block 41. The fixed strong magnetic block 41 does not move, and the second limit ring groove 43 and the second limit ring 42 perform axial limit and fixation on the fixed strong magnetic block 41.

[0027] Furthermore, a first sealing ring 22 is installed between the movable column 21 and the cylinder block of the hydraulic cylinder 11. The first sealing ring 22 can prevent the hydraulic oil in the hydraulic chamber 13 from overflowing from the gap between the movable column 21 and the cylinder block of the hydraulic cylinder 11.

[0028] Further, the overflow device includes an overflow chamber 44 disposed within the constant-strength magnetic block 41 and communicating with the hydraulic chamber 13. A secondary piston 51 is installed in the overflow chamber 44. One end of the secondary piston 51 away from the hydraulic chamber 13 is fixedly connected to the hydraulic cylinder 11 through an elastic component 52. A gap is left between the secondary piston 51 and the constant-strength magnetic block 41. An overflow hole 12 is provided on the cylinder block of the hydraulic cylinder 11. An overflow passage 45 communicating the overflow chamber 44 and the overflow hole 12 is provided on the constant-strength magnetic block 41. A second sealing ring 6 is provided between the end of the secondary piston 51 close to the hydraulic chamber 13 and the constant-strength magnetic block 41. The second sealing ring 6 can prevent the hydraulic oil in the hydraulic chamber 13 from entering the overflow passage 45 through the gap between the secondary piston 51 and the constant-strength magnetic block 41. The main function of the secondary piston 51 is to cooperate with the second sealing ring 6 to close the overflow passage 45 and the overflow hole 12. When receiving impact dynamic load, the overflow passage 45 and the overflow hole 12 are opened to drain liquid and relieve pressure.

[0029] Further, the secondary piston 51 extends axially in the overflow chamber 44 towards the primary piston 31, and the end face of the secondary piston 51 facing the primary piston 31 is not higher than the end face of the constant-strength magnetic block 41 facing the primary piston 31.

[0030] Further, the elastic component 52 includes an elastic cushion block installed between the secondary piston 51 and the hydraulic cylinder 11. The elastic cushion block is made of an elastic material. When the secondary piston 51 is pressed, the elastic cushion block is squeezed and deformed, and the secondary piston 51 moves downward (the downward movement is described based on the Figure 1 orientation in the middle). The top end of the secondary piston 51 disengages from the second sealing ring 6, and the hydraulic chamber 13, the overflow chamber 44, the overflow passage 45, and the overflow hole 12 are communicated. When the pressure on the secondary piston 51 ends, the elastic cushion block rebounds and pushes the secondary piston 51 upward, and the end of the secondary piston 51 re-cooperates with the second sealing ring 6 to block the hydraulic chamber 13 from the overflow passage 45.

[0031] The supporting capacity of the elastic component 52 can be designed according to the given working resistance or the given radius of the secondary piston 51.

[0032] Further, the elastic component 52 includes a spring installed between the secondary piston 51 and the hydraulic cylinder 11. The function of the spring is the same as that of the elastic cushion block described above, and will not be elaborated here.

[0033] Further, a safety valve 7 communicating with the hydraulic chamber 13 is installed on the cylinder block of the hydraulic cylinder 11.

[0034] Further, the end face of the moving strong magnet block 32 facing the fixed strong magnet block 41 is a convex surface, and the end face of the fixed strong magnet block 41 facing the moving strong magnet block 32 is a concave surface.

[0035] This technical solution realizes the rapid compression of the column under instantaneous dynamic load by changing the internal structure of the column. At the same time, it can ensure the load-bearing structure of the column, which can not only buffer the dynamic load pressure but also ensure the structural stability of the column, maintain the support space of the column, and ensure the safety of on-site personnel and equipment.

[0036] Compared with the prior art, the beneficial effects of this invention patent are as follows:

[0037] A strong magnetic counter-flux suspension impact-resistant column structure. This structure has a substantial change in the external shape of the original column jack. Mainly, the telescopic stroke of the emulsion pressure-holding and boosting structure is adjusted, and the strong magnetic counter-flux structure is arranged at the lower part of the column. The buffer space of the strong magnetic counter-flux structure is 0.3 m to 0.5 m.

[0038] When the support is subjected to a strong dynamic load and the overflow hole 12 opens to drain the liquid, when the main piston 31 retracts and approaches each other, a strong repulsive force is generated between the moving strong magnet block 32 and the fixed strong magnet block 41, that is, a suspended supporting force is generated on the main piston 31.

[0039] Working principle: (1) Under normal conditions, the elastic component 52 supports the auxiliary piston 51, closes the closed overflow channel 45 and the overflow hole 12, and maintains the pressure in the cylinder; when injecting liquid, the main piston 31 pushes the movable column 21 to rise to complete the support action of the support. (2) When the static load of the support increases and the column structure reaches the rated working resistance, the safety valve 7 opens to overflow, and the main piston 31 retracts (i.e., Figure 1 descends in the middle), the moving strong magnet block 32 approaches the fixed strong magnet block 41, generating a strong repulsive magnetic force to maintain the constant resistance of the column. (3) When the support column of the support is subjected to an impact dynamic load, the movable column 21 pushes the main piston 31 downward, the pressure in the cylinder surges, the auxiliary piston 51 compresses the elastic component 52 and moves downward, and a huge repulsive force is generated between the approaching moving strong magnet block 32 and the fixed strong magnet block 41, avoiding hard contact between the main piston 31 and other components. At the same time, the overflow channel 45 and the overflow hole 12 open to drain the liquid, the pressure in the cylinder is unloaded, the moving strong magnet block 32 and the fixed strong magnet block 41 move away, the huge repulsive force between the magnetic blocks disappears, the elastic component 52 resets to support the auxiliary piston 51 to rise, closes the overflow channel 45 and the overflow hole 12, completes the yielding and energy absorption function, and maintains the stable support function of the column structure.

[0040] By adding a strong magnetic structure to the column structure and using the simultaneous action of hydraulic support and magnetic force counteracting to meet the column support, the strong magnetic structure only serves as an auxiliary support during normal mining, and the hydraulic structure serves as the main support. However, when the strong impact dynamic load instantaneously compresses the column structure, the characteristics of the magnetic force counteracting structure, which is continuous and can be instantaneously compressed, are utilized to enable the column structure to perform compression buffering. At the same time, the magnetic structure can instantaneously generate a reaction force, which can not only ensure that the column structure is not damaged but also ensure the stability of the support, thereby protecting the safety of personnel at the working site.

[0041] The key points of this invention are as follows:

[0042] (1) When an external force instantaneously impacts the column structure, after the column structure is compressed, the moving strong magnetic block 32 and the fixed strong magnetic block 41 of the strong magnetic component approach each other, generating a huge repulsive force to avoid hard contact between the piston components and damaging the column.

[0043] (2) Ensure that the support using this column structure can remain stable and not be damaged by the instantaneous impact.

[0044] (3) When rock bursts and mine tremors occur, ensure the stability of the column structure and the corresponding support, and reserve the escape and survival space.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A strong magnetic counter-flux suspension and impact-resistant column structure, comprising a hydraulic cylinder and a movable column, characterized in that: One end of the movable column extends into the hydraulic cylinder and is fixedly connected to the main piston of the hydraulic cylinder. A movable strong magnet block is installed on the main piston. A fixed strong magnet block cooperating with the movable strong magnet block is installed on one side of the hydraulic cylinder away from the movable column. Along the movement direction of the main piston, the movable strong magnet block and the fixed strong magnet block are located on both sides of the hydraulic chamber of the hydraulic cylinder. An overflow device for relieving pressure on the hydraulic chamber is provided on the fixed strong magnet block.

2. The strong magnetic counter-flux suspension and impact-resistant column structure according to claim 1, characterized in that: A first limit ring groove cooperating with the main piston is provided on the cylinder block of the hydraulic cylinder. A first limit ring extending into the first limit ring groove is provided on the main piston.

3. The strong magnetic counter-flux suspension and impact-resistant column structure according to claim 1, characterized in that: A second limit ring groove cooperating with the fixed strong magnet block is provided on the cylinder block of the hydraulic cylinder. A second limit ring extending into the second limit ring groove is provided on the fixed strong magnet block.

4. The strong magnetic counter-flux suspension and impact-resistant column structure according to claim 1, characterized in that: A first sealing ring is installed between the movable column and the cylinder block of the hydraulic cylinder.

5. The strong magnetic counter-flux suspension and impact-resistant column structure according to claim 1, wherein: The overflow device includes an overflow chamber provided in the fixed strong magnet block and communicating with the hydraulic chamber. A secondary piston is installed in the overflow chamber. One end of the secondary piston away from the hydraulic chamber is fixedly connected to the hydraulic cylinder through an elastic component. A gap is left between the secondary piston and the fixed strong magnet block. An overflow hole is provided on the cylinder block of the hydraulic cylinder. An overflow channel communicating the overflow chamber and the overflow hole is provided on the fixed strong magnet block. A second sealing ring is provided between the end of the secondary piston close to the hydraulic chamber and the fixed strong magnet block.

6. The strong magnetic counter-flux suspension and impact-resistant column structure according to claim 5, wherein: The secondary piston extends axially towards the main piston in the overflow chamber, and the end face of the secondary piston facing the main piston is not higher than the end face of the fixed strong magnet block facing the main piston.

7. The strong magnetic counter-flux suspension impact-resistant column structure according to claim 5, characterized in that: The elastic component includes an elastic cushion block installed between the secondary piston and the hydraulic cylinder.

8. The strong magnetic counter-flux suspension and impact-resistant column structure according to claim 5, characterized in that: The elastic component includes a spring installed between the secondary piston and the hydraulic cylinder.

9. The strong magnetic counter-flux suspension and impact-resistant column structure according to claim 1, characterized in that: A safety valve communicating with the hydraulic chamber is installed on the cylinder block of the hydraulic cylinder.

10. The strong magnetic counter-flux suspension and impact-resistant column structure according to any one of claims 1 to 9, characterized in that: The end face of the movable strong magnet block facing the fixed strong magnet block is a convex surface, and the end face of the fixed strong magnet block facing the movable strong magnet block is a concave surface.

Images