CN221400585U - Roadway support device for coal mining and tunneling - Google Patents

Abstract

The utility model belongs to the technical field of roadway support, and in particular relates to a roadway support device for coal mining and tunneling, which comprises a top plate, a U-shaped frame and a lifting mechanism, wherein the lifting mechanism is arranged between the top plate and the U-shaped frame, a vibration damping mechanism is arranged between the top plate and the lifting mechanism and is used for buffering impact force of roadway vibration on the top plate and the lifting mechanism, the vibration damping mechanism comprises a bearing plate, the bearing plate is arranged between the lifting end of the lifting mechanism and the top plate, a plurality of vibration damping buffers are uniformly distributed between the upper side of the bearing plate and the top plate, and vibration damping components are arranged at the lower side of the bearing plate and at the positions connected with the lifting end of the lifting mechanism. Through the arrangement of the vibration reduction mechanism, the device can effectively buffer the impact force of the roadway vibration on the top plate and the lifting mechanism, reduce the damage rate of the top plate and the lifting mechanism and prolong the service life of the device.

Description

Roadway support device for coal mining and tunneling

Technical Field

The utility model belongs to the technical field of roadway support, and particularly relates to a roadway support device for coal mining and tunneling.

Background

The coal mine tunnel tunneling and supporting technology is important for mining engineering, and can open up stable and efficient environment for coal mine development operation, ensure construction efficiency and ensure safety of people and property. Most coal mine tunnels are generally driven by blasting and mechanical driving, and mechanical driving is a main direction of development along with continuous improvement and improvement of the performance of driving mechanical equipment. But more than 40% of personal casualties accidents in the coal mine tunneling production operation are roof accidents in the working face supporting process. Because the tunneling space is limited and the overhead operation is not allowed, tunneling and supporting are always mutually influenced, and the supporting of the tunnel is also indispensable to coal mining tunneling.

The utility model discloses a roadway support device for coal mining tunnelling, it is specific including the arc roof, U-shaped frame is installed to arc roof downside, be provided with elevating system between the two, when need upwards adjust the arc roof, through the worm rotation drive worm wheel rotation to elevating system in, the worm wheel can drive a threaded rod rotation, a threaded rod can drive another threaded rod synchronous rotation through the transmission of first bevel gear, the second bevel gear, the gangbar, and the rotation direction of two threaded rods is opposite, two elevating brackets can be driven upward movement operation by two threaded rods this moment, then realized the high regulation operation of arc roof at U-shaped frame top, adapt to different high roadway support operation.

However, in the process of supporting the roadway, the top plate and the top wall of the roadway form rigid contact, mechanical vibration generated in the process of mechanical tunneling often causes vibration of the roadway, the vibration of the roadway is acted on the top plate and transmitted to the lifting mechanism through the top plate, the top plate and the lifting mechanism are damaged for a long time, and the service life of the device is shortened.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model aims to provide a roadway support device for coal mining and tunneling, which can effectively buffer impact force of roadway vibration on a top plate and a lifting mechanism, reduce damage rate of the top plate and the lifting mechanism and prolong the service life of the whole device.

The technical scheme of the utility model is as follows:

The roadway support device for coal mining and tunneling comprises a vibration reduction mechanism, a vibration reduction mechanism and a lifting mechanism, wherein the vibration reduction mechanism is arranged between a top plate and the lifting mechanism and is used for buffering impact force on the top plate and the lifting mechanism caused by roadway vibration;

The vibration damping mechanism includes:

The bearing plate is arranged between the lifting end of the lifting mechanism and the top plate;

the vibration reduction buffers are uniformly distributed between the bearing plate and the top plate;

And the vibration reduction assembly is arranged at the connection part of the lifting end of the lifting mechanism and the bearing plate.

Preferably, the vibration reduction buffer comprises an upper connecting plate and a lower connecting plate, wherein the upper connecting plate is fixedly connected with the top plate, the lower connecting plate is fixedly connected with the bearing plate, the side walls of the upper connecting plate and the side walls of the lower connecting plate, which are opposite, are fixedly connected with a plurality of vibration reduction blocks, the vibration reduction blocks on the upper side and the lower side are in one-to-one correspondence, and elastic pieces are arranged between the two vibration reduction blocks, which are opposite from top to bottom, of each group.

Preferably, the elastic piece comprises a plurality of spring rings, the plurality of spring rings are uniformly distributed between the two vibration reduction blocks, the two vibration reduction blocks are sleeved on the spring rings, and the axes of the plurality of spring rings are coincident.

Preferably, a guiding structure is further arranged between the upper connecting plate and the lower connecting plate, the guiding structure comprises a cylinder and a sleeve, the sleeve is sleeved on the cylinder, the cylinder is coincident with the axis of the sleeve, the axis of the cylinder is perpendicular to the axis of the spring ring, one end of the cylinder, which is separated from the sleeve, is fixedly connected with the upper connecting plate, and one end, which is separated from the cylinder, of the sleeve is fixedly connected with the lower connecting plate.

Preferably, the vibration damping assembly comprises a fixed plate, the fixed plate downside with elevating system's lifting end links firmly, the upside of fixed plate with be provided with a plurality of movable rods between the loading board, the movable rod slope sets up, the loading board with correspond every on the opposite lateral wall of fixed plate the spout has all been seted up to the movable rod, the upper and lower both ends of movable rod are in through the slider the fixed plate with slide in the spout on the loading board, the movable rod with the slider is articulated, every be located in the spout the both sides of slider slip direction all are provided with first damping spring.

Preferably, each sliding groove is fixedly connected with a sliding shaft, the axis of the sliding shaft is parallel to the sliding direction of the sliding block, the sliding block and the first damping spring are sleeved on the sliding shaft, and the sliding block is in sliding connection with the sliding shaft.

Preferably, a plurality of elastic rollers are also transversely arranged on the upper side of the top plate, and the elastic rollers are fixedly connected with the top plate.

Preferably, the lifting mechanism comprises a lifting plate, the lifting plate is vertically inserted into the side wall of the U-shaped frame, the upper end of the lifting plate penetrates out of the top wall of the U-shaped frame and is fixedly connected with the fixing plate, a push plate is arranged on the lower side of the lifting plate, two push rods which are oppositely arranged are hinged to the lower side of the push plate, the two push rods are arranged in a splayed mode, one end of each push rod, which is far away from the push plate, is hinged to a screw sleeve, the two screw sleeves are respectively sleeved at two ends of the double-end stud, the double-end stud is connected with the side wall of the U-shaped frame in a rotating mode, and a buffer component is arranged between the push plate and the lifting plate and used for reducing impact force of vibration on the push rods.

Preferably, the buffer assembly comprises a plurality of second damping springs, the second damping springs are uniformly distributed between the lifting plate and the pushing plate, the extending and contracting direction of the second damping springs is parallel to the lifting direction of the lifting plate, a guide rod is inserted into each second damping spring, the lower end of each guide rod is inserted into the pushing plate, and the upper end of each guide rod is fixedly connected with the lifting plate.

Preferably, the outer side walls of the U-shaped frames are fixedly provided with vibration reduction pads, and the side walls of the vibration reduction pads, which deviate from the U-shaped frames, are uniformly provided with a plurality of transversely arranged grooves.

Compared with the prior art, the roadway support device for coal mining and tunneling has the following beneficial effects:

In the application process, when the mechanical vibration causes the acting force of roadway vibration to be transmitted to the top plate, the vibration buffer of the first stage can be carried out on the impact force acting on the top plate through the vibration buffer, so that the impact force of roadway vibration acting on the top plate is reduced, then the impact force reduced through the vibration buffer is transmitted to the vibration damping assembly, at the moment, the vibration damping assembly achieves the vibration buffer of the second stage of the impact force, vibration acting on the top plate is further reduced, the vibration is effectively slowed down and reduced when being transmitted to the lifting mechanism, the vibration damping mechanism can effectively buffer the impact force of roadway vibration on the top plate and the lifting mechanism, the damage rate of the top plate and the lifting mechanism is reduced, and the whole service life of the device is prolonged.

Drawings

FIG. 1 is a front view of an overall structure of an embodiment of the present utility model;

FIG. 2 is a perspective view of the overall structure of an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a shock absorber according to an embodiment of the present utility model;

FIG. 4 is an enlarged schematic view of FIG. 2A;

FIG. 5 is a schematic view of a vibration damping assembly according to an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a lifting mechanism according to an embodiment of the utility model.

Reference numerals illustrate:

1. A top plate; 2. a U-shaped frame; 3. a vibration damping mechanism; 31. a carrying plate; 32. a vibration damping buffer; 321. an upper connecting plate; 322. a lower connecting plate; 323. a vibration damping block; 324. a spring ring; 33. a vibration damping assembly; 331. a fixing plate; 332. a movable rod; 333. a chute; 334. a slide block; 335. a first damper spring; 4. a guide structure; 41. a column; 42. a sleeve; 5. a slide shaft; 6. an elastic roller; 7. a lifting mechanism; 71. a lifting plate; 72. a push plate; 73. a push rod; 74. a screw sleeve; 75. a double-ended stud; 8. a buffer assembly; 81. a second damper spring; 82. a guide rod; 9. and a vibration damping pad.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Referring to fig. 1 and 2, in order to effectively buffer the impact force of roadway vibration on the top plate 1 and the lifting mechanism 7, the damage rate of the top plate 1 and the lifting mechanism 7 is reduced, and the service life of the whole device is prolonged. The embodiment provides a roadway support device for coal mining and tunneling, which comprises a top plate 1, a U-shaped frame 2 and a lifting mechanism 7, wherein the lifting mechanism 7 is arranged between the top plate 1 and the U-shaped frame 2, and a vibration reduction mechanism 3 is further arranged between the top plate 1 and the lifting mechanism 7. The vibration damping mechanism 3 comprises a bearing plate 31, the bearing plate 31 is arranged between the lifting end of the lifting mechanism 7 and the top plate 1, a plurality of vibration damping buffers 32 are arranged between the upper side of the bearing plate 31 and the top plate 1, the vibration damping buffers 32 are uniformly distributed, and a vibration damping assembly 33 is arranged at the lower side of the bearing plate 31 and at the position connected with the lifting end of the lifting mechanism 7.

In the application process, when the acting force of the roadway vibration caused by the mechanical vibration is transmitted to the top plate 1, the vibration buffer 32 can be used for buffering the impact force acting on the top plate 1 in a first-stage mode, so that the impact force of the roadway vibration acting on the top plate 1 is reduced, then the impact force reduced by the vibration buffer 32 is transmitted to the vibration damping assembly 33, at the moment, the vibration damping assembly 33 achieves the vibration buffering of the impact force in a second-stage mode, vibration acting on the top plate 1 is further reduced, the vibration is effectively relieved and reduced when being transmitted to the lifting mechanism 7, the vibration damping mechanism 3 can be used for effectively buffering the impact force of the roadway vibration on the top plate 1 and the lifting mechanism 7, the damage rate of the top plate 1 and the lifting mechanism 7 is reduced, and the whole service life of the device is prolonged.

Referring to fig. 2 and 3, further, in order to improve the vibration reduction effect, the vibration reduction buffer 32 includes an upper connecting plate 321 and a lower connecting plate 322, the upper connecting plate 321 is fixedly connected with the top plate 1, the lower connecting plate 322 is fixedly connected with the bearing plate 31, opposite side walls of the upper connecting plate 321 and the lower connecting plate 322 are fixedly connected with a plurality of vibration reduction blocks 323, the upper connecting plate 321 corresponds to the vibration reduction blocks 323 on the lower connecting plate 322 one by one, a space is arranged between each group of two vibration reduction blocks 323 which are opposite up and down, elastic members are arranged between each group of two vibration reduction blocks 323 which are opposite up and down, the preferred elastic members are preferably composed of a plurality of spring rings 324, the plurality of spring rings 324 are uniformly distributed between the two vibration reduction blocks 323, the two vibration reduction blocks 323 are sleeved on the spring rings 324, and axes of the plurality of spring rings 324 coincide.

In the application process, when the vibration action of tunnel is in roof 1, roof 1 can be with the impact force direct transfer of vibration for upper connecting plate 321, upper connecting plate 321 can give pressure to lower connecting plate 322 direction this moment, and spring coil 324 can effectually realize letting out the power when upper connecting plate 321 is to lower connecting plate 322 impact, slow down the impact force, and because spring coil's axis tends to be perpendicular with the impact force, can effectively improve the bearing capacity to the impact force, in the in-process of realizing damping effectually shorten elastic deformation's scope, avoid elastic deformation's scope too big cause the rocking of device great.

Further, in order to ensure the deformation stability of the spring ring 324, a guiding structure 4 is further disposed between the upper connecting plate 321 and the lower connecting plate 322, preferably, two guiding structures 4 are disposed in each damper 32, the guiding structure 4 includes a cylinder 41 and a sleeve 42, the sleeve 42 is sleeved on the cylinder 41, the axis of the cylinder 41 coincides with that of the sleeve 42, the axis of the cylinder 41 is perpendicular to that of the spring ring 324, one end of the cylinder 41 separated from the sleeve 42 is fixedly connected to the upper connecting plate 321, and one end of the sleeve 42 separated from the cylinder 41 is fixedly connected to the lower connecting plate 322.

In the application process, through the sliding of the cylinder 41 in the sleeve 42, and the sliding direction is perpendicular to the axis of the spring ring 324, the perpendicularity between the moving direction of the upper connecting plate 321 and the lower connecting plate 322 and the axis of the spring ring 324 can be effectively ensured, so that vibration can be buffered to the greatest extent, and the vibration buffering effect is improved.

Referring to fig. 4 and 5, further, in order to buffer the impact force again after being reduced by the vibration reduction buffer 32 and improve the protection of the lifting mechanism 7, the vibration reduction assembly 33 includes a fixed plate 331, the lower side of the fixed plate 331 is fixedly connected with the lifting end of the lifting mechanism 7, a plurality of movable rods 332 are disposed between the upper side of the fixed plate 331 and the bearing plate 31, the movable rods 332 are obliquely disposed, a sliding slot 333 is disposed on the opposite side wall of the bearing plate 31 and the fixed plate 331 corresponding to each movable rod 332, the upper and lower ends of the movable rods 332 slide in the sliding slots 333 on the fixed plate 331 and the bearing plate 31 through sliding blocks 334, the movable rods 332 are hinged with the sliding blocks 334, and first vibration reduction springs 335 are disposed on two sides, located in the sliding direction of the sliding blocks 334, of each sliding slot 333. Further, in order to ensure the expansion stability of the first damping springs 335, a sliding shaft 5 is fixedly connected in each sliding chute 333, the axis of the sliding shaft 5 is parallel to the sliding direction of the sliding block 334, the sliding block 334 and the first damping springs 335 are sleeved on the sliding shaft 5, and the sliding block 334 is in sliding connection with the sliding shaft 5.

In the application process, when the impact force generated after the roadway vibration is reduced by the vibration reduction buffer 32 is transmitted to the movable rod 332, at this time, the movable rod 332 slides in the sliding groove 333 through the sliding blocks 334 at two ends, and the sliding blocks 334 receive the reaction force of the first vibration reduction springs 335 in the sliding groove 333, so that the impact force is reduced again, the impact force finally acts on the lifting mechanism 7 to be smaller, and the damage to the lifting mechanism 7 is reduced.

Further, in order to better protect the top plate 1 and reduce the direct acting force of roadway vibration on the top plate 1, a plurality of elastic rollers 6 are also transversely arranged on the upper side of the top plate 1, and the elastic rollers 6 are fixedly connected with the top plate 1. Preferably, the elastic rollers 6 are made of rubber, and flexible contact between the top plate 1 and the top wall of the roadway can be realized through the elastic rollers 6, so that irreversible damage to the top plate 1 caused by rigid contact collision between the top wall of the roadway and the top plate 1 is avoided, and the service life of the top plate 1 is prolonged.

Further, with reference to fig. 1 and 6, to accommodate different channel heights and to reduce damage to the lifting mechanism 7. The lifting mechanism 7 is arranged between each vertical side wall of the U-shaped frame 2 and the bearing plate 31, the two lifting mechanisms 7 are identical in structure, each lifting mechanism 7 comprises a lifting plate 71, the lifting plates 71 are vertically inserted into the side walls of the U-shaped frame 2, the upper ends of the lifting plates 71 penetrate out of the top wall of the U-shaped frame 2 and are fixedly connected with the fixed plates 331, push plates 72 are arranged on the lower sides of the lifting plates 71, two push rods 73 which are oppositely arranged are hinged to the lower sides of the push plates 72, the two push rods 73 are arranged in a splayed mode, screw sleeves 74 are hinged to one ends of the push rods 73, far away from the push plates 72, of the two screw sleeves 74 are respectively sleeved at two ends of the screw studs 75, the screw studs 75 are rotatably connected with the side walls of the U-shaped frame 2, and driving wheels are further connected to one ends of the screw studs 75 for better driving the screw studs, the screw studs 75 can be indirectly rotated through the driving wheels through manual or mechanical force, and accordingly the lifting plates 71 can be pushed up or down to adapt to different roadway heights.

Further, as shown in fig. 6, the effectiveness of the push rod 73 and the stud 75 is better protected. A buffer assembly 8 is arranged between the push plate 72 and the lifting plate 71, and the buffer assembly 8 is used for reducing the impact force of vibration on the push rod 73. The buffer assembly 8 comprises a plurality of second damping springs 81, the second damping springs 81 are uniformly distributed between the lifting plate 71 and the push plate 72, the extending and contracting direction of the second damping springs 81 is parallel to the lifting direction of the lifting plate 71, a guide rod 82 is inserted into each second damping spring 81, the lower end of the guide rod 82 is inserted into the push plate 72, and the upper end of the guide rod 82 is fixedly connected with the lifting plate 71. By the cooperation of the second vibration damping spring 81 and the guide rod 82, the third-stage vibration buffering is realized between the lifting plate 71 and the push plate 72, so that the vibration impact force acting on the push rod 73 can be effectively reduced, and the safety performance of the lifting mechanism 7 is provided.

Further, as shown in fig. 1, the outer side walls of the U-shaped frame 2 are fixedly provided with vibration damping pads 9, and the side walls of the vibration damping pads 9, which deviate from the U-shaped frame 2, are uniformly provided with a plurality of transversely arranged grooves. The vibration damping pad 9 can further buffer transverse vibration from a roadway, so that better protection of the U-shaped frame 2 is realized, and the grooves formed in the vibration damping pad 9 can further sharply reduce direct transmission of vibration force to the U-shaped frame 2, so that the protection effect of the U-shaped frame 2 is improved.

Embodiments of the present device:

When the roadway is supported in the coal mining and tunneling process, the device is moved into the roadway, and then the two lifting plates 71 can synchronously lift up by driving the two studs 75 simultaneously until the elastic rollers 6 on the upper side of the top plate 1 are squeezed tightly with the top wall of the roadway. When mechanical vibration in the working process of coal mining machinery causes roadway vibration, the buffer acting force of the elastic roller 6 is firstly transmitted to the top plate 1, at the moment, the impact force acting on the top plate 1 can be subjected to primary vibration buffering through the vibration buffer 32, so that the impact force of the roadway vibration acting on the top plate 1 is reduced, then the impact force reduced through the vibration buffer 32 is transmitted to the vibration damping component 33, at the moment, the vibration damping component 33 realizes secondary vibration buffering of the impact force, vibration acting on the top plate 1 is further reduced, so that the vibration is effectively reduced when being transmitted to the lifting mechanism 7, and the vibration is directly acted on the lifting plate 71 after being transmitted to the lifting mechanism 7, at the moment, the lifting plate 71 can transmit the vibration after being buffered twice to the buffer component 8, at the moment, the vibration acting on the roadway is subjected to tertiary vibration buffering, so that the vibration acting on the lifting mechanism 7 is greatly reduced, and the continuous three-stage vibration damping action of the vibration acting on the top plate 1 and the lifting mechanism 7 is formed through the vibration damping mechanism 3 and the buffer component 8, the service life of the whole device of the lifting mechanism 1 and the lifting mechanism 7 is prolonged.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. The roadway support device for coal mining and tunneling is characterized by comprising a vibration reduction mechanism (3) which is arranged between a top plate (1) and a lifting mechanism (7), wherein the vibration reduction mechanism (3) is used for buffering impact force brought by roadway vibration to the top plate (1) and the lifting mechanism (7);

The vibration damping mechanism (3) comprises:

A bearing plate (31) arranged between the lifting end of the lifting mechanism (7) and the top plate (1);

A plurality of vibration reduction buffers (32) which are uniformly distributed between the bearing plate (31) and the top plate (1);

And the vibration reduction assembly (33) is arranged at the connection part of the lifting end of the lifting mechanism (7) and the bearing plate (31).

2. The roadway support device for coal mining and tunneling according to claim 1, wherein the vibration reduction buffer (32) comprises an upper connecting plate (321) and a lower connecting plate (322), the upper connecting plate (321) is fixedly connected with the top plate (1), the lower connecting plate (322) is fixedly connected with the bearing plate (31), a plurality of vibration reduction blocks (323) are fixedly connected to opposite side walls of the upper connecting plate (321) and the lower connecting plate (322), the vibration reduction blocks (323) on the upper side and the lower side are in one-to-one correspondence, and elastic pieces are arranged between each group of two vibration reduction blocks (323) which are opposite up and down.

3. A roadway support apparatus for coal mining and tunnelling as claimed in claim 2, wherein the elastic member comprises a plurality of spring rings (324), the plurality of spring rings (324) are uniformly distributed between two vibration reduction blocks (323), the two vibration reduction blocks (323) are sleeved on the spring rings (324), and the axes of the plurality of spring rings (324) are coincident.

4. A roadway support device for coal mining and tunneling according to claim 3, characterized in that a guide structure (4) is further arranged between the upper connecting plate (321) and the lower connecting plate (322), the guide structure (4) comprises a cylinder (41) and a sleeve (42), the sleeve (42) is sleeved on the cylinder (41), the axis of the cylinder (41) coincides with that of the sleeve (42), the axis of the cylinder (41) is perpendicular to that of the spring ring (324), one end of the cylinder (41) away from the sleeve (42) is fixedly connected to the upper connecting plate (321), and one end of the sleeve (42) away from the cylinder (41) is fixedly connected to the lower connecting plate (322).

5. The roadway support device for coal mining and tunneling according to claim 1, wherein the vibration reduction assembly (33) comprises a fixed plate (331), the lower side of the fixed plate (331) is fixedly connected with the lifting end of the lifting mechanism (7), a plurality of movable rods (332) are arranged between the upper side of the fixed plate (331) and the bearing plate (31), the movable rods (332) are obliquely arranged, sliding grooves (333) are formed in the side walls, opposite to the fixed plate (331), of the bearing plate (31) corresponding to the movable rods (332), the upper end and the lower end of the movable rods (332) are respectively in sliding grooves (333) in the fixed plate (331) and the bearing plate (31) through sliding blocks (334), the movable rods (332) are hinged with the sliding blocks (334), and first vibration reduction springs (335) are arranged on the two sides, located in the sliding directions of the sliding blocks (334), of each sliding groove (333).

6. The roadway support device for coal mining and tunneling according to claim 5, wherein a sliding shaft (5) is fixedly connected in each sliding groove (333), the axis of the sliding shaft (5) is parallel to the sliding direction of the sliding block (334), the sliding block (334) and the first damping spring (335) are sleeved on the sliding shaft (5), and the sliding block (334) is in sliding connection with the sliding shaft (5).

7. The roadway support device for coal mining and tunneling according to claim 1, wherein a plurality of elastic rollers (6) are further transversely arranged on the upper side of the top plate (1), and the elastic rollers (6) are fixedly connected with the top plate (1).

8. The roadway support device for coal mining and tunneling according to claim 5, wherein the lifting mechanism (7) comprises a lifting plate (71), the lifting plate (71) is vertically inserted into the side wall of the U-shaped frame (2), the upper end of the lifting plate (71) penetrates out of the top wall of the U-shaped frame (2) and is fixedly connected with the fixing plate (331), a push plate (72) is arranged on the lower side of the lifting plate (71), two push rods (73) which are oppositely arranged are hinged on the lower side of the push plate (72), two push rods (73) are arranged in a splayed mode, a screw sleeve (74) is hinged at one end, away from the push plate (72), of each push rod (73), two screw sleeves (74) are respectively sleeved at two ends of each screw bolt (75), the screw bolts (75) are rotatably connected with the side wall of the U-shaped frame (2), a buffer assembly (8) is arranged between the push plate (72) and the lifting plate (71), and the buffer assembly (8) is used for buffering the impact force of the push rods (73).

9. The roadway support device for coal mining and tunneling according to claim 8, wherein the buffer assembly (8) comprises a plurality of second damping springs (81), the second damping springs (81) are uniformly distributed between the lifting plate (71) and the pushing plate (72), the extending and retracting directions of the second damping springs (81) are parallel to the lifting direction of the lifting plate (71), guide rods (82) are inserted into each second damping spring (81), the lower ends of the guide rods (82) are inserted into the pushing plate (72), and the upper ends of the guide rods (82) are fixedly connected with the lifting plate (71).

10. The roadway support device for coal mining and tunneling according to claim 8, wherein vibration reduction pads (9) are fixedly arranged on the outer side walls of the U-shaped frames (2), and a plurality of transversely arranged grooves are uniformly formed in the side walls, deviating from the U-shaped frames (2), of the vibration reduction pads (9).