A piston rod device for a hydraulic support in a mine

Abstract

The present invention discloses a piston rod top cylinder device for a mine hydraulic support, which relates to the technical field of mine hydraulic supports and includes a piston rod top cylinder body, a telescopic rod, a first hydraulic oil port, a second hydraulic oil port, an inner cavity and a piston. The inner cavity is formed inside the piston rod top cylinder body, the piston is arranged at the end of the telescopic rod, and the second hydraulic oil port and the first hydraulic oil port are respectively arranged at the upper end and the lower end of the piston rod top cylinder body; when the hydraulic support is subjected to a large load in the present invention, the speed of the support plate descending is relatively slow, and the telescopic springs I on both sides can also slow down the speed of the piston descending. The workers under the hydraulic support have sufficient time to escape. It can ensure that there is a certain oil pressure inside the inner cavity, which can limit the piston from continuing to move along the inner wall of the inner cavity. When the telescopic rod is compressed by a large load, it reduces the tendency of the piston to continue to approach the middle rod, and is conducive to the piston resetting to its original position after the load is removed.

Description

Technical Field

[0001] The present invention relates to the technical field of mine hydraulic supports, and particularly to a column top cylinder device for mine hydraulic supports. Background Art

[0002] A hydraulic support is a structure used to control the mine pressure in a coal mining face. The mine pressure in the face acts on the hydraulic support in the form of an external load. The support plate of the hydraulic support is supported by the column top cylinder of the hydraulic support, so that the mine structure is relatively firm.

[0003] In the prior art, when the hydraulic support supports the mine, sometimes workers stand under the hydraulic support. When the hydraulic support is subjected to a relatively large load, the support plate will descend. At this time, the hydraulic oil of the hydraulic support is discharged relatively quickly, making the workers at the bottom of the hydraulic support relatively dangerous. The workers do not have enough time to evacuate from the support plate of the hydraulic support. When the telescopic rod and the piston continue to descend, more hydraulic oil in the inner cavity will be discharged, resulting in no hydraulic oil under the inner cavity and unable to provide oil pressure. It is difficult for the telescopic rod to maintain its original state or the hydraulic oil to maintain its original pressure. Summary of the Invention

[0004] The purpose of the present invention is to provide a column top cylinder device for mine hydraulic supports to solve the problems raised in the above background art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A column top cylinder device for mine hydraulic supports includes a column top cylinder body, a telescopic rod, a first hydraulic oil port, a second hydraulic oil port, an inner cavity, and a piston. The inner cavity is opened inside the column top cylinder body. The piston is arranged at the end of the telescopic rod. The second hydraulic oil port and the first hydraulic oil port are respectively arranged at the upper end and the lower end of the column top cylinder body. A buffer structure is arranged at the bottom end of the column top cylinder body and on one side of the first hydraulic oil port. The buffer structure includes a first fixing block and a second fixing block. The first fixing block and the second fixing block are welded to the inner wall of the column top cylinder body. The positions of the first fixing block and the second fixing block correspond to the first hydraulic oil port. A middle rod and a guiding block are arranged between the first fixing block and the second fixing block. The two ends of the middle rod are respectively slidably connected with a first movable block and a second movable block. A first telescopic spring is arranged between the first fixing block and the second movable block, and between the second fixing block and the first movable block. Four connecting rods are arranged between the first movable block and the second movable block. Two middle blocks are connected between the diagonals of the four connecting rods. The positions of the middle blocks correspond to the position of the piston.

[0007] As a preferred technical solution of the present invention, guide holes are provided inside the first movable block and the second movable block. The cross-section of the guide hole is adapted to the cross-section of the guide block. The four connecting rods have the same length, and connecting pins are provided at the ends of the four connecting rods.

[0008] As a preferred technical solution of the present invention, the axes of the two intermediate blocks are on the same vertical line. The first movable block and the second movable block are located at the diagonal of the four connecting rods, and the first movable block and the second movable block move in opposite directions, and the two intermediate blocks move in opposite directions.

[0009] As a preferred technical solution of the present invention, a limiting structure is provided inside the second fixed block. The limiting structure includes a clamping strip. The clamping strip is integrally manufactured with the first movable block. The clamping strip is located on both sides of the first movable block. A clamping groove is provided on the end face of the second fixed block. The clamping strip penetrates through the end face of the clamping groove. An oil passage hole one is provided inside the second fixed block. A clamping block is slidably connected inside the second fixed block. The end of the clamping strip is in contact with the clamping block. An oil passage hole two is provided inside the clamping block. A second telescopic spring is provided inside the clamping block. A reserved groove is provided on the inner wall of the inner cavity and in the second fixed block. The inside of the reserved groove is slidably connected with the clamping block.

[0010] As a preferred technical solution of the present invention, a limiting step is provided on the end face of the clamping strip. The cross-section of the limiting step is adapted to the cross-section of the clamping groove. The limiting step is slidably connected inside the clamping groove.

[0011] As a preferred technical solution of the present invention, the clamping block is slidably connected with the inner wall of the second fixed block. The number of the oil passage hole one and the oil passage hole two is three. The positions of the oil passage hole one and the oil passage hole two correspond to each other. A rubber pad is provided on the side wall of the clamping block.

[0012] As a preferred technical solution of the present invention, the second fixed block and the clamping block are staggered. The side wall of the clamping block blocks the position of the oil passage hole one, and the oil passage hole two of the clamping block is located inside the reserved groove.

[0013] As a preferred technical solution of the present invention, the second fixed block and the clamping block coincide. The inside of the hydraulic oil port one, the oil passage hole one, the oil passage hole two and the inside of the inner cavity are connected and communicated.

[0014] As a preferred technical solution of the present invention, a reset structure is provided between the middle block at the lower end and the inner bottom end of the inner cavity. The reset structure includes a fixed ring welded to the middle block at the lower end. A telescopic column and a third telescopic spring are provided between the lower part of the middle block and the bottom end of the inner cavity. The telescopic column is arranged inside the third telescopic spring. A fixed column is welded to the inner bottom end of the inner cavity. The inside of the fixed column is adapted to the fixed ring. Two fixed grooves are formed in the upper end inside of the fixed column. A fixed strip and a fourth telescopic spring are arranged inside each fixed groove. The fourth telescopic spring is located in the middle of the fixed strip. The fixed strip is adapted to the fixed ring.

[0015] As a preferred technical solution of the present invention, the fixed strip is slidably connected to the inside of the fixed groove and is engaged with the fixed ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. A buffer structure is provided. The downward pressing force of the piston inside the inner cavity is decomposed into two transverse forces. Thus, when the hydraulic support is subjected to a large load, the descending speed of the support plate is relatively slow, and the two side first telescopic springs can also slow down the descending speed of the piston. The staff below the hydraulic support has enough time to escape, which is relatively safe.

[0018] 2. A limiting structure is provided. When the movable block moves towards the inner wall direction of the inner cavity, the clamping strip moves against the clamping block, so that the first oil passage hole and the second oil passage hole can be staggered, preventing hydraulic oil from continuing to enter and exit from the first hydraulic oil port, ensuring a certain oil pressure inside the inner cavity, and restricting the piston from continuing to move along the inner wall of the inner cavity, avoiding the support plate at the top of the column jack pressing the staff below.

[0019] 3. The buffer structure and the limiting structure cooperate with each other to ensure that as long as the piston moves downward by a large distance, the limiting structure will be triggered to work. The slower descending speed allows enough time to prevent the hydraulic oil from entering and exiting. When the piston is subjected to a large load, the position of the piston can be restricted.

[0020] 4. A reset structure is provided. When the piston pushes the middle block towards the middle of the middle rod, the third telescopic spring can pull the middle block moving towards the middle outwards. Thus, when the telescopic rod is compressed under a large load, the tendency of the piston to continue approaching the middle rod is reduced, which is beneficial for the piston to reset to its original position after the load is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 It is the main structure diagram of the present invention;

[0023] Figure 2Internal schematic diagram of the cylinder block of the column top cylinder of the present invention;

[0024] Figure 3 Schematic diagram of the buffer structure of the present invention;

[0025] Figure 4 Schematic diagram of the guide block and the guide hole of the present invention;

[0026] Figure 5 Schematic diagram of the disassembled buffer structure of the present invention;

[0027] Figure 6 Schematic diagram of the limit structure of the present invention;

[0028] Figure 7 Internal schematic diagram of the second fixing block of the present invention;

[0029] Figure 8 Schematic diagram of the disassembled limit structure of the present invention;

[0030] Figure 9 Schematic diagram of the reset structure of the present invention;

[0031] Figure 10 Schematic diagram of the fixing bar and the fourth telescopic spring of the present invention.

[0032] In the figure: 1. Cylinder block of the column top cylinder; 2. Telescopic rod; 3. First hydraulic oil port; 4. Second hydraulic oil port; 5. Inner cavity; 6. Piston; 7. Buffer structure; 8. Limit structure; 9. Reset structure; 71. First fixing block; 72. Second fixing block; 73. Intermediate rod; 74. First movable block; 75. Second movable block; 76. First telescopic spring; 77. Connecting rod; 78. Intermediate block; 79. Guide block; 710. Guide hole; 81. Clamping block; 82. First oil through hole; 83. Second telescopic spring; 84. Reserved groove; 85. Clamping strip; 86. Rubber pad; 87. Clamping groove; 88. Limit step; 89. Second oil through hole; 91. Telescopic column; 92. Third telescopic spring; 93. Fixed column; 94. Fixed groove; 95. Fixing bar; 96. Fourth telescopic spring; 97. Fixed ring. Detailed implementation manners

[0033] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1:

[0035] Please refer to Figures 1-3As shown in the figure, a piston rod top cylinder device for a mine hydraulic support includes a piston rod top cylinder body 1, a telescopic rod 2, a first hydraulic oil port 3, a second hydraulic oil port 4, an inner cavity 5, and a piston 6. The inner cavity 5 is opened inside the piston rod top cylinder body 1. The piston 6 is arranged at the end of the telescopic rod 2. The second hydraulic oil port 4 and the first hydraulic oil port 3 are respectively arranged at the upper end and the lower end of the piston rod top cylinder body 1. Hydraulic oil is introduced through the first hydraulic oil port 3 and discharged through the second hydraulic oil port 4. At this time, the piston 6 inside the piston rod top cylinder body 1 is pushed by the hydraulic oil, causing the telescopic rod 2 to extend from the piston rod top cylinder body 1, so that the mine hydraulic support can be lifted. When hydraulic oil is introduced through the second hydraulic oil port 4, the hydraulic oil is discharged through the first hydraulic oil port 3. At this time, the piston 6 inside the piston rod top cylinder body 1 is pushed by the hydraulic oil, causing the telescopic rod 2 to contract. A buffer structure 7 is arranged at the bottom end of the piston rod top cylinder body 1 on one side of the first hydraulic oil port 3. The buffer structure 7 includes a first fixed block 71 and a second fixed block 72. The first fixed block 71 and the second fixed block 72 are welded to the inner wall of the piston rod top cylinder body 1. The inside of the second fixed block 72 is hollowed out. The positions of the first fixed block 71 and the second fixed block 72 correspond to the first hydraulic oil port 3. An intermediate rod 73 and a guide block 79 are arranged between the first fixed block 71 and the second fixed block 72. The intermediate rod 73 and the guide block 79 are integrally arranged. The two ends of the intermediate rod 73 are respectively slidably connected with a first movable block 74 and a second movable block 75. A first telescopic spring 76 is arranged between the first fixed block 71 and the second movable block 75 and between the second fixed block 72 and the first movable block 74. Four connecting rods 77 are arranged between the first movable block 74 and the second movable block 75. Two intermediate blocks 78 are connected between the diagonals of the four connecting rods 77. The four connecting rods 77 are rotatably connected with the intermediate blocks 78. The position of the intermediate block 78 corresponds to the position of the piston 6. When the hydraulic support exceeds the load, the piston rod top cylinder will contract. At this time, the telescopic rod 2 and the piston 6 descend along the inner wall of the inner cavity 5. Thus, the hydraulic oil below the piston 6 is discharged from the first hydraulic oil port 3. The piston 6 contacts the intermediate block 78, which can reduce the descending speed of the telescopic rod 2. And under the action of the first telescopic spring 76, it can also prevent the piston 6 from continuing to descend. When the hydraulic support is subjected to a large load, the personnel below the hydraulic support will not be pressed, which is relatively safe.

[0036] Please refer to Figures 3-5 As shown in the figure, guide holes 710 are opened inside the first movable block 74 and the second movable block 75. The cross-section of the guide holes 710 is adapted to the cross-section of the guide block 79. The four connecting rods 77 have the same length. Connection pins are arranged at the ends of the four connecting rods 77. When the intermediate block 78 is compressed, the four connecting rods 77 change, and thus the intermediate block 78 between the connecting rods 77 also changes.

[0037] Please refer to Figure 5As shown, the axes of the two intermediate blocks 78 are on the same vertical line. The first movable block 74 and the second movable block 75 are located at the diagonals of the four connecting rods 77, and the moving directions of the first movable block 74 and the second movable block 75 are opposite. The moving directions of the two intermediate blocks 78 are opposite. Changes in the four connecting rods 77 cause the second movable block 75 and the first movable block 74 to approach or move away from each other. Similarly, changes in the four connecting rods 77 cause the two intermediate blocks 78 to approach or move away from each other.

[0038] It should be noted that when the hydraulic support supports the mine, the mine can be supported by extending the top cylinder of the column. At this time, if the hydraulic support is subjected to a large load, the support plate is likely to descend and press the workers below the support plate. At this time, it can be handled by the buffer structure 7. The telescopic rod 2 shortens along the inside of the cylinder body 1 of the top cylinder of the column. The piston 6 will discharge the hydraulic oil at the bottom end of the inner cavity 5 from the first hydraulic oil port 3. During the descent of the inner cavity 5, it will first contact the intermediate block 78. The intermediate block 78 is squeezed, causing the first movable block 74 and the second movable block 75 on both sides of the intermediate rod 73 to move away from each other. The first movable block 74 and the second movable block 75 compress their respective first telescopic springs 76. Thus, the first telescopic spring 76 can also slow down the descent process of the piston 6, prevent the piston 6 from continuing to press the intermediate block 78, and give more reaction time to the personnel below the hydraulic support. When the telescopic rod 2 extends out of the inside of the cylinder body 1 of the top cylinder of the column, the piston 6 separates from the intermediate block 78, and under the action of the first telescopic spring 76, the first movable block 74 and the second movable block 75 are moved closer to the middle.

[0039] Please refer to Figure 2 and Figure 6As shown, a limiting structure 8 is provided inside the fixing block two 72. The limiting structure 8 includes a clamping strip 85, which is integrally manufactured with the movable block one 74. The clamping strip 85 is located on both sides of the movable block one 74. A clamping groove 87 is formed on the end face of the fixing block two 72. The clamping strip 85 penetrates through the end face of the clamping groove 87. The clamping strip 85 will move along with the movable block one 74, so that the clamping strip 85 can be slidably connected inside the fixing block two 72. An oil passage hole one 82 is formed inside the fixing block two 72, and the oil passage hole one 82 communicates with the hollow fixing block two 72. A clamping block 81 is slidably connected inside the fixing block two 72, and the inside of the clamping block 81 is also hollowed out. The end of the clamping strip 85 contacts the clamping block 81. An oil passage hole two 89 is formed inside the clamping block 81, and the inside of the oil passage hole two 89 communicates with the hollow clamping block 81. A second telescopic spring 83 is provided inside the clamping block 81. A reserved groove 84 is formed on the inner wall of the inner cavity 5 and at the position of the fixing block two 72. The inside of the reserved groove 84 is slidably connected with the clamping block 81. When the movable block one 74 moves to both sides, the clamping strip 85 pushes the clamping block 81 to move inside the fixing block two 72 until the clamping block 81 is moved to the reserved groove 84 on the inner wall of the inner cavity 5, or when the movable block one 74 moves away from the movable block one 74, under the action of the second telescopic spring 83, the clamping block 81 moves along the inside of the fixing block two 72, and the on-off of the hydraulic oil at the hydraulic oil port one 3 is realized by using the movement of the clamping block 81.

[0040] Please refer to Figures 6-8 As shown, a limiting step 88 is formed on the end face of the clamping strip 85. The length of the limiting step 88 is adapted to the moving distance of the clamping block 81. The cross section of the limiting step 88 is adapted to the cross section of the clamping groove 87. The limiting step 88 is slidably connected with the inside of the clamping groove 87. When the clamping strip 85 moves along with the movable block one 74, the clamping block 81 is pushed towards the reserved groove 84 by using the clamping strip 85 and the limiting step 88, and the position change of the clamping strip 85 and the limiting step 88 is used for limiting, so that the oil passage hole one 82 and the oil passage hole two 89 move relative to each other when the clamping block 81 moves.

[0041] Please refer to Figures 6-8 As shown, the clamping block 81 is slidably connected with the inner wall of the fixing block two 72. The number of both the oil passage hole one 82 and the oil passage hole two 89 is three. The positions of the oil passage hole one 82 and the oil passage hole two 89 correspond to each other. A rubber pad 86 is provided on the side wall of the clamping block 81. The movable block one 74 pushes the middle block 78 to move, so that the clamping block 81 and the fixing block two 72 approach or move away from each other.

[0042] Please refer to Figure 7As shown, the second fixed block 72 and the clamping block 81 are staggered. The side wall of the clamping block 81 blocks the position of the first oil passage hole 82. The second oil passage hole 89 of the clamping block 81 is located inside the reserved groove 84. The piston 6 will drive the intermediate block 78 to descend, so that the intermediate block 78 will move the first movable block 74. The clamping strip 85 and the limiting step 88 will push the clamping block 81 until the second fixed block 72 and the clamping block 81 are staggered. At this time, the first oil passage hole 82 and the second oil passage hole 89 are staggered, which can prevent the hydraulic oil from continuing to be discharged from the first hydraulic oil port 3, and can also slow down or even organize the top cylinder of the hydraulic support column from descending, protecting the workers below the hydraulic support.

[0043] Please refer to Figure 8 As shown, the second fixed block 72 and the clamping block 81 coincide. The inside of the first hydraulic oil port 3, the first oil passage hole 82, the second oil passage hole 89 and the inner cavity 5 are connected. When the first movable block 74 approaches the middle of the middle rod 73, the intermediate block 78 will separate from the clamping block 81. Then, under the action of the second telescopic spring 83, the clamping block 81 is pushed to engage with the second fixed block 72. After the first oil passage hole 82 and the second oil passage hole 89 are aligned, the hydraulic oil can normally flow through the inside of the first oil passage hole 82 and the second oil passage hole 89, without affecting the extension or shortening of the telescopic rod 2.

[0044] It should be noted that when the piston 6 pushes the intermediate block 78 to descend, the first movable block 74 will approach the inner wall of the inner cavity 5. Thus, the clamping strip 85 and the limiting step 88 move along the clamping groove 87 of the clamping block 81. The end of the limiting step 88 contacts the clamping block 81 and thus pushes the clamping block 81 to move inside the second fixed block 72. The second oil passage hole 89 of the clamping block 81 and the first oil passage hole 82 of the second fixed block 72 are staggered, so that the hydraulic oil cannot pass through the inside of the first oil passage hole 82 and the second oil passage hole 89, which can prevent the hydraulic oil from being discharged from the inner cavity 5, ensuring that the telescopic rod 2 of the top cylinder of the column will not continue to shorten. When the first hydraulic oil port 3 is filled with hydraulic oil, it can pass through the movement of the clamping block 81 inside the second fixed block 72, so that the first oil passage hole 82 and the second oil passage hole 89 coincide. Thus, the hydraulic oil enters the inner cavity 5 from the first oil passage hole 82 and the second oil passage hole 89, and the telescopic rod 2 can extend from the cylinder block 1 of the top cylinder of the column.

[0045] Please refer to Figure 2 、 Figure 9 and Figure 10As shown, a reset structure 9 is provided between the middle block 78 at the lower end and the inner bottom end of the inner cavity 5. The reset structure 9 includes a fixing ring 97, which is welded to the middle block 78 at the lower end. The fixing ring 97 will move up and down with the middle block 78 at the lower end. A telescopic column 91 and a third telescopic spring 92 are provided between the lower part of the middle block 78 and the bottom end of the inner cavity 5. The telescopic column 91 is arranged inside the third telescopic spring 92. The top end of the telescopic column 91 is fixed to the middle block 78 and the fixing ring 97. The fourth telescopic spring 96 is in a compressed state in its natural state. A fixing column 93 is welded to the inner bottom end of the inner cavity 5. The inside of the fixing column 93 is adapted to the fixing ring 97. When the piston 6 needs to rise, hydraulic oil needs to be introduced into the first hydraulic oil port 3, and under the action of the second telescopic spring 83, the reserved groove 84 and the clamping strip 85 are moved towards the middle. The fixing ring 97 extends into the inside of the fixing column 93. Two fixing grooves 94 are provided inside the upper end of the fixing column 93. Inside each fixing groove 94, a fixing strip 95 and a fourth telescopic spring 96 are provided. The fourth telescopic spring 96 is located in the middle of the fixing strip 95. The fixing strip 95 is adapted to the fixing ring 97. The fixing strip 95 is slidably connected to the inside of the fixing groove 94 and is engaged with the fixing ring 97. The fixing strip 95 is pressed by the fixing strip 95 inside the fixing column 93, and the fourth telescopic spring 96 is compressed. At this time, the positions of the two middle blocks 78 will not change. When the upper middle block 78 is compressed, the two middle blocks 78 both move closer to the middle. At this time, the third telescopic spring 92 in the compressed state is stretched, which can also slow down the descending speed of the piston 6, so as to realize the reset of the middle block 78 towards the middle.

[0046] It should be noted that when the piston 6 presses down, the two middle blocks 78 approach each other, and the third telescopic spring 92 and the clamping block 81 in the natural compression state elongate. Under the stretching trend of the third telescopic spring 92, the speed of the middle block 78 continuing to approach can also be reduced. When hydraulic oil is injected into the first hydraulic oil port 3, the piston 6 can be pushed upward, and the two middle blocks 78 move away from each other. At this time, the third telescopic spring 92 contracts and the telescopic column 91 shortens, so that the fixing ring 97 can be sent into the inside of the fixing column 93, and the edge of the fixing ring 97 is clamped by the fixing strip 95, preventing the fixing ring 97 and the middle block 78 from protruding from the inside of the fixing column 93. When the fixing ring 97 is raised again, the fixing strip 95 compresses the fourth telescopic spring 96, and the fixing ring 97 can protrude from the fixing column 93.

[0047] When the present invention is in use, when the hydraulic support supports the mine, the mine can be supported by extending the top cylinder of the upright column. At this time, if the hydraulic support is subjected to a large load, the support plate is likely to descend and press the staff below the support plate. At this time, it can be processed by the buffer structure 7. The telescopic rod 2 shortens along the inside of the cylinder body 1 of the top cylinder of the upright column. The piston 6 will discharge the hydraulic oil at the bottom end of the inner cavity 5 from the hydraulic oil port 1. During the descent of the inner cavity 5, it will first contact the intermediate block 78. The intermediate block 78 is squeezed, so that the movable block 74 and the movable block 75 on both sides of the intermediate rod 73 move away from each other. The movable block 74 and the movable block 75 compress their respective telescopic springs 76. Thus, the telescopic spring 76 can also slow down the descent process of the piston 6, and can give more reaction time to the personnel below the hydraulic support. When the telescopic rod 2 extends out of the inside of the cylinder body 1 of the top cylinder of the upright column, the piston 6 separates from the intermediate block 78, and under the action of the telescopic spring 76, the movable block 74 and the telescopic spring 76 move closer to the middle;

[0048] When the piston 6 pushes the intermediate block 78 to descend, the movable block 74 will approach the inner wall of the inner cavity 5. Thus, the clamping strip 85 and the limiting step 88 move along the clamping groove 87 of the clamping block 81. The end of the limiting step 88 contacts the clamping block 81, thereby pushing the clamping block 81 to move along the inside of the fixed block 72. The oil through hole 89 of the clamping block 81 and the oil through hole 82 of the fixed block 72 are staggered, so that the hydraulic oil cannot pass through the inside of the oil through hole 82 and the oil through hole 89, which can prevent the hydraulic oil from being discharged from the inner cavity 5, and ensure that the telescopic rod 2 of the top cylinder of the upright column will not continue to shorten. When the hydraulic oil is introduced into the hydraulic oil port 1, the clamping block 81 can move inside the fixed block 72, so that the oil through hole 82 and the oil through hole 89 coincide, and thus the hydraulic oil enters the inner cavity 5 from the oil through hole 82 and the oil through hole 89, and the telescopic rod 2 can extend out of the cylinder body 1 of the top cylinder of the upright column;

[0049] The piston 6 presses down, causing the two intermediate blocks 78 to approach each other. The telescopic spring 92 and the clamping block 81 in the natural compression state elongate. Under the stretching trend of the telescopic spring 92, the speed of the intermediate block 78 continuing to approach can also be reduced. When the hydraulic oil is injected into the hydraulic oil port 1, the piston 6 can be pushed upward. The two intermediate blocks 78 move away from each other. At this time, the telescopic spring 92 contracts and the telescopic column 91 shortens. Thus, the fixing ring 97 can be sent into the fixing column 93, and the edge of the fixing ring 97 is clamped by the fixing strip 95, preventing the fixing ring 97 and the intermediate block 78 from protruding from the inside of the fixing column 93. When the fixing ring 97 is raised again, the fixing strip 95 compresses the telescopic spring 96, and the fixing ring 97 can protrude from the fixing column 93.

[0050] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments only. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A column top cylinder device for a mine hydraulic support, comprising a column top cylinder body (1), a telescopic rod (2), a hydraulic oil port 1 (3), a hydraulic oil port 2 (4), an inner cavity (5) and a piston (6), wherein the inner cavity (5) is opened inside the column top cylinder body (1), the piston (6) is arranged at the end of the telescopic rod (2), and the hydraulic oil port 2 (4) and the hydraulic oil port 1 (3) are respectively arranged at the upper end and the lower end of the column top cylinder body (1); characterized in that: A buffer structure (7) is provided at the bottom end of the column top cylinder body (1) and on one side of the hydraulic oil port 1 (3). The buffer structure (7) comprises a fixing block 1 (71) and a fixing block 2 (72). The fixing block 1 (71) and the fixing block 2 (72) are welded to the inner wall of the column top cylinder body (1). The positions of the fixing block 1 (71) and the fixing block 2 (72) correspond to the hydraulic oil port 1 (3). An intermediate rod (73) and a guide block (79) are arranged between the fixing block 1 (71) and the fixing block 2 (72). , two ends of the intermediate rod (73) are slidably connected with a movable block 1 (74) and a movable block 2 (75), respectively, a telescopic spring 1 (76) is arranged between the fixed block 1 (71) and the movable block 2 (75), and between the fixed block 2 (72) and the movable block 1 (74), four connecting rods (77) are arranged between the movable block 1 (74) and the movable block 2 (75), two intermediate blocks (78) are connected between the diagonal lines of the four connecting rods (77), and the position of the intermediate block (78) corresponds to the position of the piston (6); A limiting structure (8) is arranged inside the second fixed block (72), and the limiting structure (8) includes a clamping strip (85), and the clamping strip (85) is manufactured integrally with the first movable block (74). The clamping strip (85) is located on both sides of the first movable block (74). A clamping groove (87) is provided on the end surface of the second fixed block (72), and the clamping strip (85) passes through the end surface of the clamping groove (87). An oil hole (85) is provided inside the second fixed block (72). (82), the interior of the second fixed block (72) is slidably connected to the clamping block (81), the end of the clamping strip (85) is in contact with the clamping block (81), the interior of the clamping block (81) is provided with a second oil hole (89), the interior of the clamping block (81) is provided with a second telescopic spring (83), the inner wall of the inner cavity (5) and located at the second fixed block (72) is provided with a reserved groove (84), and the interior of the reserved groove (84) is slidably connected to the clamping block (81).

2. The column-lifting cylinder device for a mine hydraulic support according to claim 1 is characterized in that: The movable block 1 (74) and the movable block 2 (75) are provided with guide holes (710) in their interiors, the cross-section of the guide holes (710) being adapted to the cross-section of the guide block (79), the four connecting rods (77) having the same length, and connecting pins being arranged at the ends of the four connecting rods (77).

3. The column-lifting cylinder device for a mine hydraulic support according to claim 2 is characterized in that: The axes of the two intermediate blocks (78) are located on the same vertical line, the movable block 1 (74) and the movable block 2 (75) are located at the diagonal lines of the four connecting rods (77), and the movable block 1 (74) and the movable block 2 (75) move in opposite directions, and the two intermediate blocks (78) move in opposite directions.

4. The column-lifting cylinder device for a mine hydraulic support according to claim 3 is characterized in that: The end surface of the clamping strip (85) is provided with a limiting step (88), the cross section of the limiting step (88) is matched with the cross section of the clamping groove (87), and the limiting step (88) is slidably connected to the inside of the clamping groove (87).

5. The column-lifting cylinder device for a mine hydraulic support according to claim 4 is characterized in that: The clamping block (81) is slidably connected to the inner wall of the second fixing block (72); the number of the first oil hole (82) and the number of the second oil hole (89) are both three; the position of the first oil hole (82) corresponds to the position of the second oil hole (89); and a rubber pad (86) is provided on the side wall of the clamping block (81).

6. The column lifting cylinder equipment for mine hydraulic support according to claim 5 is characterized in that: The second fixing block (72) and the clamping block (81) are staggered, the side wall of the clamping block (81) blocks the position of the first oil hole (82), and the second oil hole (89) of the clamping block (81) is located inside the reserved groove (84).

7. The column lifting cylinder equipment for mine hydraulic support according to claim 5 is characterized in that: The second fixing block (72) and the clamping block (81) overlap, and the interior of the first hydraulic oil port (3), the first oil hole (82), the second oil hole (89) and the interior of the inner cavity (5) are connected.

8. The column lifting cylinder device for a mine hydraulic support according to claim 3 or 4, characterized in that: A reset structure (9) is arranged between the middle block (78) at the lower end and the inner bottom end of the inner cavity (5), and the reset structure (9) comprises a fixing ring (97), the fixing ring (97) is welded to the middle block (78) at the lower end, a telescopic column (91) and a telescopic spring three (92) are arranged between the lower part of the middle block (78) and the bottom end of the inner cavity (5), the telescopic column (91) is arranged inside the telescopic spring three (92), a fixing column (93) is welded to the inner bottom end of the inner cavity (5), the interior of the fixing column (93) is matched with the fixing ring (97), two fixing grooves (94) are arranged inside the upper end of the fixing column (93), a fixing strip (95) and a telescopic spring four (96) are arranged inside each fixing slot (94), the telescopic spring four (96) is located in the middle of the fixing strip (95), and the fixing strip (95) is matched with the fixing ring (97).

9. The column lifting cylinder device for a mine hydraulic support according to claim 8, characterized in that: The fixing strip (95) is slidably connected to the interior of the fixing groove (94), and the fixing strip (95) is engaged with the fixing ring (97).

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