A coal mine hydraulic support device with adjustable support area

Abstract

The present invention discloses a coal mine hydraulic support device with adjustable support area, and relates to the technical field of coal mine hydraulic support. The present invention comprises a base, a connecting rod is rotatably connected to one side of the top of the base, a shield frame is rotatably connected to the upper end of the connecting rod, a top beam is rotatably connected to the upper end of the shield frame, the top beam and the base are connected by a hydraulic rod transmission, one end of the top beam is rotatably connected to the front beam, and a jack is arranged between the top beam and the front beam, an extension device is arranged below the front beam, the extension device comprises an electric push rod, and the electric push rod is fixed to the bottom of the front beam. Through the arrangement of the extension device, the present invention enables the electric push rod, the articulated rod, the U-shaped slide plate, the T-shaped rod, the U-shaped rod, and the trapezoidal slot frame to cooperate and drive the top surface of the extension plate to be in the same horizontal plane as the top surface of the front beam, so that the extension plate increases the support area of ​​the front beam, thereby expanding the scope of use of the hydraulic support.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine hydraulic supports, in particular to a coal mine hydraulic support device with adjustable supporting area. Background Art

[0002] Coal mine hydraulic support is a mechanical equipment used for underground mine support. It mainly provides support through the hydraulic system to maintain the stability of the mine tunnel. It can effectively prevent mine collapse and improve the working safety of miners. Hydraulic support has the characteristics of automatic adjustment and high load-bearing capacity. It is widely used in coal mining, tunneling and other operations. It is an important guarantee facility for modern mining operations.

[0003] The Chinese patent with patent announcement number CN215804649U discloses a safety hydraulic support for coal mines, including a bottom plate, a base, a shielding beam, a top beam, a front beam, a shielding plate, a jack, a connecting rod, a column, and a leveling device. The top of the bottom plate is fixed with a base, the shielding beam is located at the rear side of the bottom plate and is hinged with the rear end of the base, the rear end of the top beam is hinged with the top of the shielding beam, the front end of the top beam is fixed with the front beam, the shielding plate is hinged with the front end of the front beam and supported by a jack, the middle of the shielding beam is supported by a connecting rod, and the bottom of the connecting rod is hinged with the middle of the base, the top beam is supported by a column, and the bottom of the column is hinged with the front end of the base, and the four corners of the bottom plate are equipped with a leveling device. This patent can keep the bottom plate level, avoid shaking of the bottom plate due to uneven ground, increase the overall stability of the hydraulic support, and increase the safety in the coal mine cave.

[0004] However, the current coal mine hydraulic support has the following problems: the support area of ​​the coal mine hydraulic support is relatively fixed, and it is not convenient to adjust the support area of ​​the support, which limits the use range of the support and causes safety hazards in coal mining, and does not meet people's use needs. Therefore, we propose a coal mine hydraulic support device with adjustable support area. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a coal mine hydraulic support device with adjustable support area, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a coal mine hydraulic support device with adjustable support area, comprising a base, one side of the top of the base is rotatably connected to a connecting rod, the upper end of the connecting rod is rotatably connected to a shield frame, the upper end of the shield frame is rotatably connected to a top beam, the top beam and the base 1 are connected through a hydraulic rod transmission, one end of the top beam is rotatably connected to a front beam, and a jack is provided between the top beam and the front beam, an extension device is provided below the front beam, the extension device comprises an electric push rod, the electric push rod is fixed to the bottom of the front beam, the telescopic end of the electric push rod is hinged to two hinged rods, the ends of the two hinged rods away from the electric push rods are hinged to a U-shaped slide plate, the U-shaped slide plate is slidably installed on the bottom of the front beam, the bottom of the U-shaped slide plate passes through and slidably installs two T-shaped rods, an extension plate is fixed between the tops of the two T-shaped rods, and the two T-shaped rods are close to the center of the front beam The U-shaped slide plate is moved in a direction away from the center of the front beam, and the U-shaped slide plate drives the extension plate to move along with it through the T-shaped slide plate, and the T-shaped slide plate drives the U-shaped slide plate to slide along the L-shaped oblique groove of the trapezoidal groove frame. Under the restriction of the L-shaped oblique groove of the trapezoidal groove frame, when the extension plate moves to the two side positions of the top beam, the L-shaped oblique groove of the trapezoidal groove frame drives the U-shaped slide plate to drive the T-shaped slide plate to move upward, and the T-shaped slide plate drives the extension plate to move upward, so that the top surface of the extension plate is in the same horizontal plane as the top surface of the front beam.

[0007] According to the above technical solution, the T-shaped rod and the U-shaped slide plate are provided with buffer springs, which are used to buffer the impact force received by the U-shaped slide plate and the extension plate. At the same time, under the action of the elastic force of the buffer spring corresponding to the T-shaped rod, the buffer spring will buffer the impact force received by the U-shaped slide plate and the extension plate.

[0008] According to the above technical scheme, the extending device includes an arc block plate and two T-shaped knocking rods. The two T-shaped knocking rods are respectively vertically slidably installed on both sides of the trapezoidal slot frame, and a spring is provided between the T-shaped knocking rod and the trapezoidal slot frame. The arc block plate is fixed at the bottom of the two T-shaped knocking rods, and a plurality of arc blocks are fixed on the top of the arc block plate. The middle part of the U-shaped rod is columnar, and the arc block of the arc block plate is located on the columnar movement trajectory of the U-shaped rod. At the same time, during the movement of the U-shaped rod, the column of the U-shaped rod pushes the arc block of the arc block plate to drive the T-shaped knocking rod to move downward, and the spring corresponding to the T-shaped knocking rod is compressed. When the column of the U-shaped rod no longer pushes the arc block of the arc block plate, under the action of the spring elastic force corresponding to the T-shaped knocking rod, the T-shaped knocking rod is reset and hits the bottom surface of the U-shaped slide plate, and the U-shaped slide plate vibrates.

[0009] According to the above technical solution, a plurality of through holes are provided at the top of the front beam, and a stabilizing device is provided inside the plurality of through holes of the front beam, and the stabilizing device includes a groove, a ring frame, a screw, a threaded ring, a square rod, and a friction wheel. The groove is provided at the top of the extension plate, the ring frame is fixed at the top of the front beam, the friction wheel is rotatably mounted at the bottom of the ring frame, the square rod is fixed at the bottom of the friction wheel, the screw is slidably mounted on the outside of the square rod, the threaded ring is fixed at the top of the inner wall of the through hole of the front beam, the outside of the screw is threadably connected to the inside of the threaded ring, and the screw The top is set in a spike shape, the inner wall of one side of the groove is set as a rough surface, the outer side of the friction wheel is set as a rough surface, the rough surface of the groove contacts the rough surface of the friction wheel, and in the process of the U-shaped slide plate driving the extension plate to move through the T-shaped rod, the extension plate drives the groove to move along, and under the friction force between the rough surface of the groove and the rough surface of the friction wheel, the groove drives the friction wheel to rotate, and the friction wheel drives the screw to rotate through the square rod. The screw is affected by the thread of the threaded ring, and the screw moves upward along the outer side of the square rod, so that the spike of the screw is inserted into the supported coal seam.

[0010] According to the above technical solution, the stabilizing device also includes a connecting rod and an inclined scraper. The connecting rod is fixed on the side of the ring frame away from the center of the front beam, and the inclined scraper is fixed on the end of the connecting rod away from the ring frame. The inclined scraper contacts the inner wall of the groove. At the same time, each time the extension plate is retracted, the extension plate will drive the groove to move toward the center of the front beam, and the inclined scraper will scrape the coal mine residue adhered to the inside of the groove out of the groove.

[0011] According to the above technical solution, two locking devices are arranged at the bottom of one side of the front beam close to the top beam, and the locking device comprises a push block, a slider, a positioning rod, a hinged push rod, and a limit rod. The push block is fixed to one side of the U-shaped slide plate close to the top beam, the positioning rod is fixed to one side of the inner wall of the front beam, the slider is slidably mounted on the outside of the positioning rod, and a spring is arranged between the slider and the inner wall of the front beam, one end of the hinged push rod is hinged to the top of the slider, the limit rod is hinged to the other end of the hinged push rod, and the limit rod is slidably mounted on one side of the inner wall of the front beam, The outside of the push block is provided with a through hole that is compatible with the positioning rod, and the bottom of the telescopic front beam is provided with a sliding groove for the push block to slide. When the U-shaped slide plate moves in the direction away from the center of the front beam, the U-shaped slide plate drives the push block to move with it. When the push block moves to the slider, the push block pushes the slider to move along the outside of the positioning rod in the direction away from the front beam. The slider pushes the hinged push rod to drive the limit rod to move along one side of the inner wall of the front beam toward the direction of the top beam, and the limit rod moves to the lower position of the top beam, thereby allowing the limit rod to limit the range of downward rotation of the front beam.

[0012] The present invention provides a coal mine hydraulic support device with adjustable support area. It has the following beneficial effects:

[0013] (1) The present invention arranges an extension device so that the electric push rod, the hinged rod, the U-shaped slide plate, the T-shaped rod, the U-shaped rod, and the trapezoidal groove frame cooperate to drive the top surface of the extension plate to be on the same horizontal plane as the top surface of the front beam, so that the extension plate increases the supporting area of ​​the front beam, thereby expanding the scope of use of the hydraulic support. At the same time, the buffer spring can buffer the impact force on the U-shaped slide plate and the extension plate, thereby effectively absorbing and dispersing the impact energy, thereby reducing the wear of the U-shaped slide plate and the extension plate and extending the service life of the U-shaped slide plate and the extension plate; at the same time, the U-shaped rod and the arc block plate cooperate to drive the T-shaped knocking rod to impact the bottom surface of the U-shaped slide plate, causing the U-shaped slide plate to vibrate. The vibration of the U-shaped slide plate can avoid the problem of the U-shaped slide plate getting stuck during operation, thereby facilitating the normal operation of the U-shaped slide plate.

[0014] (2) The present invention provides a stabilizing device so that the U-shaped slide plate, T-shaped rod, extension plate, groove, friction wheel, square rod, and threaded ring cooperate to drive the spike-shaped screw to be inserted into the supported coal seam, thereby effectively increasing the contact area between the front beam and the coal seam, helping the front beam to be stably embedded in the coal seam, and improving the stability and bearing capacity of the front beam; at the same time, the inclined scraper will scrape the coal mine residue adhered to the inside of the groove out of the groove to prevent the coal mine residue from hindering the movement of the friction wheel.

[0015] (3) The present invention sets a locking device so that the U-shaped slide plate, the front beam, the push block, the slider, the positioning rod, and the hinged push rod cooperate to drive the limit rod to move to the position below the top beam, so that the limit rod limits the range of downward rotation of the front beam, preventing the front beam from excessively rotating or sinking during the operation of the hydraulic support, ensuring that the relative position relationship between the front beam and other components is not changed, thereby maintaining the overall stability of the hydraulic support and reducing the problem of structural instability of the hydraulic support caused by excessive movement or irregular rotation of the front beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is schematically shown as a whole Figure 1 ;

[0017] Figure 2 The present invention is schematically shown as a whole Figure 2 ;

[0018] Figure 3 Schematic diagram of the extension device of the present invention Figure 1 ;

[0019] Figure 4 The local structure of the extension device of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 5 The local structure of the extension device of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 6 The local structure of the extension device of the present invention is shown in FIG. Figure 3 ;

[0022] Figure 7 is an enlarged schematic diagram of the stabilizing device of the present invention;

[0023] Figure 8 Schematic diagram of the locking device of the present invention.

[0024] In the figure: 1. base; 2. hydraulic rod; 3. connecting rod; 4. shield frame; 5. top beam; 6. front beam; 7. extension device; 71. electric push rod; 72. hinged rod; 73. U-shaped slide plate; 74. T-shaped rod; 75. extension plate; 76. U-shaped rod; 77. trapezoidal groove frame; 78. T-shaped knocking rod; 79. arc block plate; 8. stabilizing device; 81. groove; 82. ring frame; 83. screw rod; 84. threaded ring; 85. square rod; 86. friction wheel; 87. connecting rod; 88. inclined scraper; 9. locking device; 91. push block; 92. slider; 93. positioning rod; 94. hinged push rod; 95. limit rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] See also Figure 1 - Figure 8 An embodiment of the present invention is: a coal mine hydraulic support device with adjustable support area, comprising a base 1, a connecting rod 3 is rotatably connected to one side of the top of the base 1, a shield frame 4 is rotatably connected to the upper end of the connecting rod 3, a top beam 5 is rotatably connected to the upper end of the shield frame 4, the top beam 5 and the base 1 are connected by a hydraulic rod 2, one end of the top beam 5 is rotatably connected to a front beam 6, and a jack is arranged between the top beam 5 and the front beam 6, the jack is a prior art, and the jack is used to drive the operation of the front beam 6, an extension device 7 is arranged below the front beam 6, the extension device 7 comprises an electric push rod 71, the electric push rod 71 is fixed to the bottom of the front beam 6, the telescopic end of the electric push rod 71 is hinged to two hinged rods 72, the ends of the two hinged rods 72 away from the electric push rod 71 are hinged to a U-shaped slide plate 73, the U-shaped slide plate 73 is slidably installed at the bottom of the front beam 6, the U-shaped slide plate Two T-shaped rods 74 are penetrated and slidably installed on the bottom of the plate 73, and an extension plate 75 is fixed between the tops of the two T-shaped rods 74, and a U-shaped rod 76 is fixed between the two T-shaped rods 74 on one side close to the center of the front beam 6. A trapezoidal slot frame 77 is fixed to the middle part of the bottom surface of the front beam 6 through a bracket, and L-shaped inclined grooves are opened on both sides of the trapezoidal slot frame 77. One end of the U-shaped rod 76 away from the T-shaped rod 74 is slidably installed in the L-shaped inclined groove of the trapezoidal slot frame 77. Both sides of the front beam 6 are provided with inclined surfaces, and the two extension plates 75 on one side close to the center of the front beam 6 are inclined surfaces, and the inclined surfaces of the front beam 6 are adapted to the inclined surfaces of the extension plates 75. Through the arrangement of the above structure, the top surface of the extension plate 75 and the top surface of the front beam 6 are in the same horizontal plane, so that the extension plate 75 increases the supporting area of ​​the front beam 6, thereby expanding the scope of use of the hydraulic support.

[0027] The T-shaped rod 74 and the U-shaped slide plate 73 are provided with buffer springs, which are used to buffer the impact force received by the U-shaped slide plate 73 and the extension plate 75. Through the setting of the above structure, the buffer spring can buffer the impact force received by the U-shaped slide plate 73 and the extension plate 75, thereby effectively absorbing and dispersing the impact energy, thereby reducing the wear of the U-shaped slide plate 73 and the extension plate 75, and extending the service life of the U-shaped slide plate 73 and the extension plate 75.

[0028] The extension device 7 includes an arc block plate 79 and two T-shaped knocking rods 78. The two T-shaped knocking rods 78 are respectively vertically slidably installed on both sides of the trapezoidal slot frame 77, and a spring is provided between the T-shaped knocking rod 78 and the trapezoidal slot frame 77. The arc block plate 79 is fixed at the bottom of the two T-shaped knocking rods 78. A plurality of arc blocks are fixed on the top of the arc block plate 79. The middle part of the U-shaped rod 76 is columnarly arranged. The arc blocks of the arc block plate 79 are located on the columnar motion trajectory of the U-shaped rod 76. Through the arrangement of the above structure, the T-shaped knocking rod 78 strikes the bottom surface of the U-shaped slide plate 73, and the U-shaped slide plate 73 vibrates. The vibration of the U-shaped slide plate 73 can avoid the problem of the U-shaped slide plate 73 getting stuck during operation, thereby contributing to the normal operation of the U-shaped slide plate 73.

[0029] The top of the front beam 6 is provided with a plurality of through holes, and a stabilizing device 8 is provided inside the plurality of through holes of the front beam 6. The stabilizing device 8 includes a groove 81, a ring frame 82, a screw 83, a threaded ring 84, a square rod 85, and a friction wheel 86. The groove 81 is provided at the top of the extension plate 75, the ring frame 82 is fixed to the bottom of the front beam 6, the friction wheel 86 is rotatably mounted at the bottom of the ring frame 82, the square rod 85 is fixed to the top of the friction wheel 86, the screw 83 is slidably mounted on the outside of the square rod 85, and the threaded ring 84 is fixed in the through hole of the front beam 6. At the top of the wall, the outside of the screw 83 is connected to the internal thread of the threaded ring 84, the top of the screw 83 is set in a spike shape, the inner wall of one side of the groove 81 is set as a rough surface, and the outside of the friction wheel 86 is set as a rough surface. The rough surface of the groove 81 contacts the rough surface of the friction wheel 86. Through the setting of the above structure, the spike shape of the screw 83 is inserted into the supported coal seam, thereby effectively increasing the contact area between the front beam 6 and the coal seam, helping the front beam 6 to be stably embedded in the coal seam, and improving the stability and bearing capacity of the front beam 6.

[0030] The stabilizing device 8 also includes a connecting rod 87 and an inclined scraper 88. The connecting rod 87 is fixed to a side of the ring frame 82 away from the center of the front beam 6, and the inclined scraper 88 is fixed to an end of the connecting rod 87 away from the ring frame 82. The inclined scraper 88 contacts the inner wall of the groove 81. Through the arrangement of the above structure, the inclined scraper 88 can scrape the coal mine residue adhered to the inside of the groove 81 out of the groove 81, thereby preventing the coal mine residue from hindering the movement of the friction wheel 86.

[0031] When the support area of ​​the front beam 6 needs to be expanded, the electric push rod 71 is started, and the telescopic end of the electric push rod 71 pushes the two hinged rods 72 to drive the U-shaped slide plate 73 to move in the direction away from the center of the front beam 6, and the U-shaped slide plate 73 drives the extension plate 75 to move along through the T-shaped rod 74, and the T-shaped rod 74 drives the U-shaped rod 76 to slide along the L-shaped inclined groove of the trapezoidal groove frame 77. Under the restriction of the L-shaped inclined groove of the trapezoidal groove frame 77, when the extension plate 75 moves to the positions on both sides of the top beam 5, the L-shaped inclined groove of the trapezoidal groove frame 77 drives the U-shaped rod 76 to drive the T-shaped rod 74 to move upward, and the T-shaped rod 74 drives the extension plate 75 to move upward, so that the top surface of the extension plate 75 and the top surface of the front beam 6 are in the same horizontal plane, so that the extension plate 75 increases the support area of ​​the front beam 6, thereby expanding the use range of the hydraulic support. It is worth noting that the inclined surface of the front beam 6 and the inclined surface of the extension plate 75 are set so that the extension plate 75 The movement will not be interfered by the front beam 6. At the same time, under the action of the buffer spring force corresponding to the T-shaped rod 74, the buffer spring will buffer the impact force received by the U-shaped slide plate 73 and the extension plate 75, thereby effectively absorbing and dispersing the impact energy, thereby reducing the wear of the U-shaped slide plate 73 and the extension plate 75 and extending the service life of the U-shaped slide plate 73 and the extension plate 75; at the same time, during the movement of the U-shaped rod 76, the columnar pushes the arc block of the arc block plate 79 to drive the T-shaped knocking rod 78 to move downward, and the spring corresponding to the T-shaped knocking rod 78 is compressed. When the columnar U-shaped rod 76 no longer pushes the arc block of the arc block plate 79, under the action of the spring force corresponding to the T-shaped knocking rod 78, the T-shaped knocking rod 78 is reset and strikes the bottom surface of the U-shaped slide plate 73, causing the U-shaped slide plate 73 to vibrate. The vibration of the U-shaped slide plate 73 can avoid the problem of jamming of the U-shaped slide plate 73 during operation, thereby contributing to the normal operation of the U-shaped slide plate 73.

[0032] When the U-shaped slide plate 73 drives the extension plate 75 to move through the T-shaped rod 74, the extension plate 75 drives the groove 81 to move along. Under the friction force between the rough surface of the groove 81 and the rough surface of the friction wheel 86, the groove 81 drives the friction wheel 86 to rotate. The friction wheel 86 drives the screw 83 to rotate through the square rod 85. The screw 83 is subjected to the threaded action of the threaded ring 84, and the screw 83 moves upward along the outside of the square rod 85, so that the spike shape of the screw 83 is inserted into the supported coal seam, thereby effectively increasing the contact area between the front beam 6 and the coal seam, helping the front beam 6 to be stably embedded in the coal seam, and improving the stability and bearing capacity of the front beam 6; at the same time, each time the extension plate 75 is retracted, the extension plate 75 drives the groove 81 to move toward the center of the front beam 6. At this time, the inclined scraper 88 will scrape the coal mine residue adhered to the inside of the groove 81 out of the groove 81 to prevent the coal mine residue from hindering the movement of the friction wheel 86.

[0033] See also Figure 1 - Figure 8On the basis of the above embodiment, in another embodiment of the present invention, two locking devices 9 are provided at the bottom of one side of the front beam 6 close to the top beam 5 .

[0034] The locking device 9 includes a push block 91, a slider 92, a positioning rod 93, a hinged push rod 94, and a limit rod 95. The push block 91 is fixed to the side of the U-shaped slide plate 73 close to the top beam 5, the positioning rod 93 is fixed to the inner wall of the front beam 6, the slider 92 is slidably installed on the outside of the positioning rod 93, and a spring is provided between the slider 92 and the inner wall of the front beam 6, one end of the hinged push rod 94 is hinged to the top of the slider 92, the limit rod 95 is hinged to the other end of the hinged push rod 94, and the limit rod 95 is slidably installed on the inner wall of the front beam 6, the push block 91 A through hole compatible with the positioning rod 93 is provided on the outside, and a sliding groove for the push block 91 to slide is provided at the bottom of the telescopic front beam 6. Through the arrangement of the above structure, the limit rod 95 limits the downward rotation range of the front beam 6 to prevent the front beam 6 from excessively rotating or sinking during the operation of the hydraulic support, ensuring that the relative position relationship between the front beam 6 and other components is not changed, thereby maintaining the overall stability of the hydraulic support and reducing the problem of structural instability of the hydraulic support caused by excessive movement or irregular rotation of the front beam 6.

[0035] When in use, as the U-shaped slide plate 73 moves away from the center of the front beam 6, the U-shaped slide plate 73 drives the push block 91 to move along with it. When the push block 91 moves to the slide block 92, the push block 91 pushes the slide block 92 to move along the outside of the positioning rod 93 in the direction away from the front beam 6. The slide block 92 drives the hinged push rod 94 to drive the limit rod 95 to move along the inner wall of the front beam 6 toward the top beam 5, and the limit rod 95 moves to the lower position of the top beam 5, so that the limit rod 95 limits the range of downward rotation of the front beam 6, preventing the front beam 6 from excessively rotating or sinking during the operation of the hydraulic support, ensuring that the relative position relationship between the front beam 6 and other components is not changed, thereby maintaining the overall stability of the hydraulic support and reducing the problem of structural instability of the hydraulic support caused by excessive movement or irregular rotation of the front beam 6.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coal mine hydraulic support device with adjustable support area, comprising a base (1), a connecting rod (3) is rotatably connected to one side of the top of the base (1), a shield frame (4) is rotatably connected to the upper end of the connecting rod (3), a top beam (5) is rotatably connected to the upper end of the shield frame (4), the top beam (5) and the base (1) are connected by a hydraulic rod (2), one end of the top beam (5) is rotatably connected to a front beam (6), and a jack is provided between the top beam (5) and the front beam (6), characterized in that: An extension device (7) is provided below the front beam (6), and the extension device (7) comprises an electric push rod (71), the electric push rod (71) is fixed to the bottom of the front beam (6), the telescopic end of the electric push rod (71) is hinged to two hinged rods (72), and the ends of the two hinged rods (72) away from the electric push rod (71) are both hinged to a U-shaped slide plate (73), and the U-shaped slide plate (73) is slidably mounted on the bottom of the front beam (6), and the bottom of the U-shaped slide plate (73) penetrates and slides Two T-shaped rods (74) are dynamically installed, an extension plate (75) is fixed between the tops of the two T-shaped rods (74), a U-shaped rod (76) is fixed between the two T-shaped rods (74) on one side close to the center of the front beam (6), a trapezoidal slot frame (77) is fixed to the middle of the bottom surface of the front beam (6) through a bracket, and L-shaped inclined grooves are formed on both sides of the trapezoidal slot frame (77), and one end of the U-shaped rod (76) away from the T-shaped rod (74) is slidably installed inside the L-shaped inclined groove of the trapezoidal slot frame (77); A plurality of through holes are formed at the top of the front beam (6), and a stabilizing device (8) is disposed inside each of the plurality of through holes of the front beam (6). The stabilizing device (8) comprises a groove (81), a ring frame (82), a screw rod (83), a threaded ring (84), a square rod (85), and a friction wheel (86). The groove (81) is formed at the top of the extension plate (75), the ring frame (82) is fixed to the bottom of the front beam (6), the friction wheel (86) is rotatably mounted on the bottom of the ring frame (82), the square rod (85) is fixed to the top of the friction wheel (86), the screw rod (83) is slidably mounted on the outside of the square rod (85), the threaded ring (84) is fixed to the top of the inner wall of the through hole of the front beam (6), and the outside of the screw rod (83) is threadably connected to the inside of the threaded ring (84); The top of the screw rod (83) is arranged in a spike shape, the inner wall of one side of the groove (81) is arranged in a rough surface, the outer surface of the friction wheel (86) is arranged in a rough surface, and the rough surface of the groove (81) is in contact with the rough surface of the friction wheel (86); The stabilizing device (8) further comprises a connecting rod (87) and an inclined scraper (88); the connecting rod (87) is fixed to a side of the ring frame (82) away from the center of the front beam (6); the inclined scraper (88) is fixed to an end of the connecting rod (87) away from the ring frame (82); and the inclined scraper (88) contacts the inner wall of the groove (81).

2. The support area adjustable coal mine hydraulic support device according to claim 1, characterized in that: The T-shaped rod (74) and the U-shaped slide plate (73) are provided with a buffer spring, and the buffer spring is used to buffer the impact force exerted on the U-shaped slide plate (73) and the extension plate (75).

3. The support area adjustable coal mine hydraulic support device according to claim 1, characterized in that: Both sides of the front beam (6) are provided with inclined surfaces, and both sides of the two extension plates (75) close to the center of the front beam (6) are provided with inclined surfaces, and the inclined surfaces of the front beam (6) are matched with the inclined surfaces of the extension plates (75).

4. The support area adjustable coal mine hydraulic support device according to claim 1, characterized in that: The extending device (7) comprises an arc block plate (79) and two T-shaped knocking rods (78). The two T-shaped knocking rods (78) are respectively mounted vertically and slidably on both sides of the trapezoidal groove frame (77), and a spring is provided between the T-shaped knocking rod (78) and the trapezoidal groove frame (77). The arc block plate (79) is fixed to the bottom of the two T-shaped knocking rods (78).

5. The support area adjustable coal mine hydraulic support device according to claim 4, characterized in that: A plurality of arc blocks are fixed on the top of the arc block plate (79), the middle portion of the U-shaped rod (76) is arranged in a columnar shape, and the arc blocks of the arc block plate (79) are located on the columnar motion track of the U-shaped rod (76).

6. The support area adjustable coal mine hydraulic support device according to claim 1, characterized in that: Two locking devices (9) are provided at the bottom of a side of the front beam (6) close to the top beam (5), and the locking device (9) comprises a push block (91), a slider (92), a positioning rod (93), a hinged push rod (94), and a limit rod (95); the push block (91) is fixed to a side of the U-shaped slide plate (73) close to the top beam (5); the positioning rod (93) is fixed to a side of the inner wall of the front beam (6); the slider (92) is slidably mounted on the outside of the positioning rod (93); a spring is provided between the slider (92) and the inner wall of the front beam (6); one end of the hinged push rod (94) is hinged to the top of the slider (92); the limit rod (95) is hinged to the other end of the hinged push rod (94); and the limit rod (95) is slidably mounted on a side of the inner wall of the front beam (6).

7. The support area adjustable coal mine hydraulic support device according to claim 6, characterized in that: A through hole matched with the positioning rod (93) is provided on the outside of the push block (91), and a sliding groove for the push block (91) to slide is provided on the bottom of the telescopic front beam (6).

Images