CN219888043U - Rock stratum pushing device and rock stratum pushing machine - Google Patents

Abstract

The utility model provides a rock stratum pushing device and a rock stratum pushing machine, and belongs to the field of rock crushing. The rock stratum pushing device comprises a shell and two pushing structures with the same structure, wherein the shell is of a box-shaped structure, and two mounting holes are formed in the shell. The pushing structure comprises a telescopic cylinder assembly and a pushing cylinder, wherein the telescopic cylinder assembly is of a telescopic cylinder structure, a front sealing plate and a rear sealing plate are respectively arranged at two ends of the telescopic cylinder assembly, the pushing cylinder is arranged in the telescopic cylinder assembly, one end of the pushing cylinder is connected with the front sealing plate, and the other end of the pushing cylinder is connected with the rear sealing plate. Because flexible section of thick bamboo subassembly can be in the mounting hole internal sliding, the both ends of flexible section of thick bamboo subassembly all can stretch out in the casing mounting hole to can break the stratum of both sides simultaneously, and then improve crushing efficiency.

Description

Rock stratum pushing device and rock stratum pushing machine

Technical Field

The utility model relates to the field of rock stratum crushing, in particular to a rock stratum pushing device and a rock stratum pushing machine.

Background

When the rock stratum is crushed, holes are generally drilled in the rock stratum, then a rock stratum pushing device extends into the rock stratum holes, and the rock stratum is crushed by using the pushing force of a hydraulic cylinder. The existing stratum pushing device is generally characterized in that a cylinder body (namely the large end of a pushing structure) is fixed on a shell of the pushing device, and then the small end of a hydraulic cylinder stretches out through expansion and contraction, so that the stratum is crushed. In this manner of operation, the large end portion of the hydraulic cylinder is difficult to crush the rock formation directly, which tends to affect the crushing efficiency.

Disclosure of Invention

The utility model aims to provide a stratum pushing device and a stratum pushing machine, wherein the large end and the small end of a hydraulic cylinder of the stratum pushing device can extend out of the main body of the pushing device, so that the crushing efficiency is improved.

The utility model is realized in the following way:

a formation pushing device, comprising:

the shell is provided with a mounting hole, and positioning pieces are respectively arranged at two ends of the mounting hole; the pushing structure comprises a telescopic cylinder assembly and a pushing cylinder, wherein the telescopic cylinder assembly is of a telescopic cylindrical structure, a front sealing plate and a rear sealing plate are respectively arranged at two ends of the telescopic cylinder assembly, the pushing cylinder is arranged in the telescopic cylinder assembly, the small-diameter end of the pushing cylinder is connected with the front sealing plate, and the large-diameter end of the pushing cylinder is connected with the rear sealing plate; the telescopic cylinder assembly is slidably arranged in the mounting hole, so that two ends of the telescopic cylinder can extend out of the mounting hole, and a cylinder limiting piece is arranged on the telescopic cylinder assembly; and the limiting parts at the two ends of the mounting hole are used for preventing the barrel limiting parts from falling out of the mounting hole.

Optionally, the telescopic cylinder assembly comprises an outer cylinder and an inner cylinder; the outer cylinder is sleeved on the inner cylinder in a sliding manner; the barrel limiting piece is in an annular plate shape and is arranged in the middle of the outer barrel or at one end of the outer barrel, which is far away from the rear sealing plate; among the positioning pieces at the two ends of the mounting hole, when the pushing cylinder is completely recovered, a front positioning piece is close to the front sealing plate, and a rear positioning piece is close to the rear sealing plate; the outer cylinder is also sleeved with a compression spring, one end of the compression spring is abutted with the cylinder limiting piece, and the other end of the compression spring is abutted with the rear positioning piece.

The structure has the advantages that when the pushing cylinder is completely extended, the end part of the inner cylinder and the end part of the outer cylinder can extend out of the shell, so that the crushing efficiency is improved; so that the crushing effect is better. And the inner cylinder and the outer cylinder are easy to be completely recovered into the shell after the pushing cylinder is completely recovered due to the arrangement of the spring, so that the pushing device is favorably removed from the rock stratum.

Optionally, the telescopic cylinder assembly further comprises a middle cylinder, the middle cylinder is sleeved on the inner cylinder, and the outer cylinder is sleeved on the middle cylinder; the middle cylinder is in sliding fit with the inner cylinder, and the outer cylinder is in sliding fit with the middle cylinder.

The advantage of this kind of structure lies in, through increasing the quantity of flexible section of thick bamboo subassembly, can be under the circumstances that does not increase flexible section of thick bamboo subassembly length, improves the extension of flexible section of thick bamboo subassembly, and then improves the top pushing range of thrustor.

Optionally, a yielding plane is arranged on the outer wall of the middle cylinder, and an installation space is formed between the yielding plane and the inner wall of the outer cylinder; the pushing structure further comprises two oil pipes, wherein the two oil pipes extend along the length direction of the telescopic cylinder assembly and are positioned in the installation space; the ends of the two oil pipes are connected with the end of the pushing cylinder.

By arranging the built-in installation space, the oil pipe is arranged between the middle cylinder and the outer cylinder under the condition of not influencing the expansion and contraction; the oil pipe and the oil supply pipeline are integrated in the shell, so that the oil pipe is prevented from being damaged by broken stones.

Optionally, an inner cylinder limiting part is arranged on the outer wall of the inner cylinder, an inner wall limiting part is arranged on the inner wall of the middle cylinder, and an outer wall limiting part is arranged on the outer wall of the middle cylinder; one end of the middle cylinder, which is close to the rear positioning piece, is also provided with a stop block;

when the pushing cylinder stretches, the outer wall limiting part can be abutted with the front positioning piece, and the inner wall limiting part can be abutted with the inner cylinder limiting part; when the pushing cylinder is shortened, the end part of the inner cylinder can be abutted with the stop block.

The structure has the advantages that in the extending process of the pushing cylinder, the inner cylinder and the outer cylinder extend outwards from the shell under the drive of the pushing cylinder, the inner cylinder limiting part contacts with the inner wall limiting part of the middle cylinder to drive the middle sleeve to extend outwards in the extending process of the inner cylinder, the extending range of the inner cylinder and the middle cylinder is limited until the pushing cylinder extends completely, the extending range of the outer cylinder is limited, and single pushing is completed. When the pushing cylinder is recovered, the pushing cylinder drives the inner cylinder and the outer cylinder to move into the shell, in the moving process of the inner cylinder, the rear end of the inner cylinder is abutted with a stop block at the rear end of the middle cylinder, the inner cylinder drives the middle cylinder to move towards the middle of the shell, and the spring helps the outer cylinder, the middle cylinder and the inner cylinder to return to the set positions; the arrangement of the middle sleeve is beneficial to obtaining larger pushing stroke under the condition of the same shell.

Optionally, an inner barrel limiting part is arranged on the outer wall of the inner barrel, and when the pushing cylinder stretches, the inner barrel limiting part can be abutted with the front positioning piece.

The structure has the advantages that in the extending process of the pushing cylinder, the inner cylinder and the outer cylinder extend outwards from the shell under the drive of the pushing cylinder, the limiting part of the inner cylinder is abutted with the front positioning piece in the extending process of the inner cylinder, the extending range of the inner cylinder is limited until the pushing cylinder extends completely, the extending range of the outer cylinder is limited, and single pushing is completed; when the pushing cylinder is recovered, the pushing cylinder drives the inner cylinder and the outer cylinder to move into the box body, and the spring helps the outer cylinder and the inner cylinder to return to the set positions.

Optionally, the rear positioning piece comprises an annular plate and a positioning cylinder which are connected with each other, the positioning cylinder is inserted into the mounting hole, and the compression spring is abutted with the inner end of the positioning cylinder; the annular plate is connected with the shell through screws;

the positioning cylinder is provided with a U-shaped groove which extends to the inner end of the positioning cylinder; a threaded through hole is formed in one side of the shell, and a positioning screw rod is arranged in the threaded through hole; the inner end of the positioning screw rod is positioned in the U-shaped groove.

The structure has the advantages that when the pushing structure is mounted on the shell, the pushing cylinder, the inner cylinder, the front locating piece and the outer cylinder are mounted in place, then the spring is sleeved on the outer cylinder, the spring is compressed to the position of the threaded through hole by the aid of the tool, the spring is continuously compressed for a certain distance, then the locating screw is mounted, and the tool is removed. After the tool is removed, the spring is abutted with the end part of the positioning screw rod, then the U-shaped groove is aligned with the positioning screw rod to be installed in place, and after the rear positioning piece is installed in place, the positioning screw rod is separated from the spring; the positioning screw groove is convenient for installing and removing the spring.

The shell is of a cylindrical structure, and the inner cavity of the cylindrical structure forms the mounting hole.

The ejector may be an integrated structure of a multi-stage cylinder and telescopic cylinder assembly mounted in the mounting cylinder, the ejector being secured to a mount in use.

Optionally, the casing is box form, be provided with a plurality of on the casing the mounting hole, every all be provided with in the mounting hole the pushing structure.

The plurality of pushing structures may be arranged in different directions, for example, one longitudinal direction and one transverse direction, so that pushing can be performed in a plurality of directions simultaneously.

Optionally, the telescopic directions of the pushing cylinders in the adjacent mounting holes are different.

The rock stratum pushing machine comprises a power device and the rock stratum pushing device, wherein the rock stratum pushing device is arranged on the power device.

The beneficial effects of the utility model are as follows:

according to the rock stratum pushing device and the rock stratum pushing machine, which are obtained through the design, when the rock stratum pushing device is used, the rock stratum pushing device is arranged on the rock stratum pushing machine, and then the rock stratum pushing device is sent into a pre-punched rock stratum hole. At the moment, the pushing cylinder is extended, and as the telescopic cylinder assembly can slide in the mounting hole, both ends of the telescopic cylinder assembly can extend out of the mounting hole of the shell, so that rock strata on both sides can be crushed simultaneously; thereby improving the crushing efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of a formation pushing device provided in example 1;

FIG. 2 is a front view of the formation pushing device provided in example 1;

FIG. 3 is a partial cross-sectional view taken along the direction A-A in FIG. 2 provided in example 1;

FIG. 4 is an exploded view of the example 1 pusher device at a first angle after removal of the housing;

FIG. 5 is an exploded view of the example 1 pusher shown in a second angular orientation after removal of the housing;

FIG. 6 is a cross-sectional view of the formation pusher provided in example 1 fully retracted into the housing;

fig. 7 is a cross-sectional view of a formation pushing device provided in example 2.

Icon: 1-a formation ejector; 11-a housing; 111-upper box body; 112-lower box; 1121-mounting holes; 113-positioning a screw; 114-front positioning piece; 115-a rear positioning member; 1151-an annular plate; 1152-positioning a cartridge; 1153-U-shaped groove; 12-pushing structure; 120-telescoping cartridge assembly; 121-an inner cylinder; 1211-an inner barrel stop; 122-an intermediate cylinder; 1221—yield plane; 1222-an inner wall limit; 1223-outer wall limit; 1224-stop; 123-an outer cylinder; 1231-barrel stop; 124-front seal plate; 125-a rear sealing plate; 126-compressing the spring; 127-pushing cylinder; 128-oil pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

For convenience of description, in this embodiment, for the pushing structure, the large diameter end is defined as the rear end, and the small diameter end is defined as the front end.

Example 1:

referring to fig. 1-2, the present embodiment provides a rock stratum pushing device 1, which includes a housing 11 and two pushing structures 12 with the same structure, wherein the housing 11 is a box-shaped structure, and two mounting holes 1121 are provided in the housing 11. The pushing structure 12 is arranged in the mounting hole 1121, and when the pushing structure 12 stretches, both ends of the pushing structure can extend out of the mounting hole 1121, so that rock strata can be crushed from different directions.

Referring to fig. 3 to 5, the pushing structure 12 includes a telescopic cylinder assembly 120 and a pushing cylinder 127, the telescopic cylinder assembly 120 is a multi-stage telescopic structure, and two ends of the telescopic cylinder assembly are respectively provided with a front sealing plate 124 and a rear sealing plate 125; the pushing cylinder 127 is disposed in the telescopic cylinder assembly 120, and has one end connected to the front sealing plate 124 and the other end connected to the rear sealing plate 125. The telescopic cylinder assembly 120 is slidably arranged in the mounting hole 1121, and positioning pieces are arranged at two ends of the mounting hole 1121; the telescopic cylinder assembly 120 is provided with a cylinder limiting member 1231, and the cylinder limiting member 1231 is used for preventing the telescopic cylinder assembly 120 from being entirely separated from the mounting hole 1121.

Specifically, the telescopic cylinder assembly 120 includes an outer cylinder 123, an intermediate cylinder 122, and an inner cylinder 121, wherein the outer cylinder 123 is slidably sleeved on the intermediate cylinder 122, and the intermediate cylinder 122 is slidably sleeved on the inner cylinder 121. For convenience of description, a large diameter end is defined as a rear end and a small diameter end is defined as a front end with reference to an extended state of the telescopic cylinder assembly 120. In this embodiment, a front sealing plate 124 is disposed at the front end of the inner cylinder 121, and a rear sealing plate 125 is disposed at the rear end of the outer cylinder 123, thereby forming a closed structure. The pushing cylinder 127 is disposed in the telescopic cylinder assembly 120, and the large diameter end of the pushing cylinder 127 is hinged to the rear sealing plate 125, and the small diameter end of the pushing rod is hinged to the front sealing plate 124. The cylinder stopper 1231 has a circular plate structure and is sleeved on the inner end of the outer cylinder 123.

Because the inner cylinder 121, the outer cylinder 123 and the middle cylinder 122 can all axially move in the mounting hole 1121, when the pushing cylinder 127 extends, the pushing cylinder 127 can push the inner cylinder 121 and the outer cylinder 123 to move relative to the shell 11 and partially extend out of the mounting hole 1121, so that rock strata on two sides can be crushed, and the crushing efficiency is improved.

The positioning members at both ends of the mounting hole 1121 of the housing 11 are of annular plate-like structure, are coaxially provided with the mounting hole 1121, and are connected to the housing 11 by bolts. When the pushing cylinder 127 is completely retracted, the front positioning member 114 close to the front sealing plate 124 and the outer cylinder 123 of the rear positioning member 115 close to the rear sealing plate 125 are sleeved with the compression spring 126, the compression spring 126 is located in the mounting hole 1121, one end of the compression spring 126 is connected (fixedly connected or abutted) with the cylinder limiting member 1231, and the other end of the compression spring is connected (fixedly connected or abutted) with the rear positioning member 115.

Further, an inner cylinder stopper 1211 is provided on the rear end outer wall of the inner cylinder 121, an inner wall stopper 1222 is provided on the front end inner wall of the intermediate cylinder 122, and an outer wall stopper 1223 is provided on the front end outer wall of the intermediate cylinder 122; the limiting parts are all boss structures. When the pushing cylinder 127 extends, the pushing cylinder 127 drives the inner cylinder 121 to move forward, the inner cylinder limiting part 1211 is firstly abutted with the inner wall limiting part 1222 of the middle cylinder 122, and then the inner cylinder 121 drives the middle cylinder 122 to move forward until the outer wall limiting part 1223 of the middle cylinder 122 is abutted with the front sealing plate 124; as the ejector cylinder 127 continues to extend, it pushes the outer cylinder 123 rearward until the compression spring 126 is compressed; at this time, both the outer cylinder 123 and the inner cylinder 121 are partially located outside the installation hole 1121, so that the rock formations on both sides can be pushed at the same time.

A stop 1224 is also provided at the rear end of the intermediate barrel 122, the stop 1224 being removably connected to the intermediate barrel 122. When the pushing cylinder 127 is shortened, both ends of the telescopic cylinder assembly 120 are separated from the rock strata, and at this time, the outer cylinder 123 is pushed into the mounting hole 1121 by the compression spring 126 so that the rear sealing plate 125 is flush with the end of the mounting hole 1121. When the pushing cylinder 127 continues to shrink, the inner cylinder 121 moves backwards until the rear end of the inner cylinder 121 abuts against the stop 1224; at this time, the inner cylinder 121 drives the middle cylinder 122 to move backward through the stopper 1224; eventually, the telescoping cylinder assembly 120 is fully retracted into the mounting hole 1121. When the inner tube 121 is to be removed from the intermediate tube 122, the stopper 1224 is removed.

When the telescopic cylinder assembly 120 is fully retracted into the mounting hole 1121, in order to prevent the telescopic cylinder assembly 120 from being moved in the mounting hole 1121, it is necessary to put the compression spring 126 in a compressed state so that the compression spring 126 continuously applies a pushing force to the outer cylinder 123, preventing it from being moved outward. Therefore, when the pushing structure 12 is assembled into the mounting hole 1121, it is necessary to fix the front positioning member 114 to the housing 11 and assemble the pushing cylinder 127, the inner cylinder 121, the intermediate cylinder 122, and the outer cylinder 123 in place; then, the compression spring 126 is sleeved on the outer cylinder 123, and the compression spring 126 is compressed to a preset position by utilizing a tool. Finally, the rear retainer 115 is connected to the housing 11, thereby fixing the ends of the compression springs 126.

In order to facilitate the assembly of the compression spring 126 and the rear positioning piece 115, a threaded through hole is formed in the side portion of the mounting hole 1121, and a positioning screw 113 is arranged in the threaded through hole and is used for pre-fixing the compression spring 126 after the compression of the tool; thereby facilitating the connection of the rear anchor 115 to the housing 11. The rear positioning member 115 includes an annular plate 1151 and a positioning cylinder 1152, the positioning cylinder 1152 is inserted into the mounting hole 1121, and the annular plate 1151 is connected to the housing 11 by bolts. The positioning cylinder 1152 is provided with a U-shaped groove 1153, and the U-shaped groove 1153 extends to the inner end of the positioning cylinder 1152; a threaded through hole is formed in one side of the shell 11, and a positioning screw 113 is arranged in the threaded through hole; the inner end of the positioning screw 113 is located in the U-shaped groove 1153.

When the positioning screw 113 is specifically assembled, after the compression spring 126 is compressed to the position of the threaded through hole by using the tool, the compression is continued for a certain distance, and then the positioning screw 113 is installed; at this time, the positioning screw 113 abuts against the end of the compression spring 126, so that the compression spring 126 is kept in a compressed state. At this time, the tooling may be removed; and the notch of the U-shaped groove 1153 is aligned with the positioning screw 113, and the bolts on the annular plate 1151 are tightened so that the rear positioning member 115 gradually approaches the housing 11; at this time, the end of the positioning tube 1152 abuts against the compression spring 126, and the positioning screw 113 is separated from the compression spring 126.

In this embodiment, the housing 11 is in a box shape, and includes an upper box 111 and a lower box 112, where the upper box 111 is in a rectangular cylindrical structure, and the lower cylinder is in a square box structure. The lower case 112 is provided with an opening toward the upper side, and the lower case 112 is provided with a lateral mounting hole 1121 and a longitudinal mounting hole 1121. In other embodiments, the upper case 111 and the lower case 112 may be provided in an oval shape or other shapes.

In order to facilitate the arrangement of the oil pipe 128 of the pushing oil cylinder, a yielding plane 1221 is arranged on the outer wall of the middle barrel 122; the relief surface 1221 corresponds to a structure formed by cutting a part of the outer wall of the intermediate tube 122 in the axial direction of the intermediate tube 122. The relief surface 1221 forms an installation space with the inner wall of the outer cylinder 123, and the oil pipe 128 is disposed in the installation space and extends in the longitudinal direction of the telescopic cylinder assembly 120. One end of the oil pipe 128 is connected to the rear end of the pushing cylinder 127, and the other end extends to the front end of the outer cylinder 123 and is connected to a delivery pipe inside the housing 11. The design can enable the oil pipe 128 and the conveying pipeline to be fully integrated inside the shell 11, so that the whole structure is more compact, and broken stones can be prevented from damaging the oil pipe 128 and the conveying pipeline.

The working principle and beneficial effects of the rock stratum pushing device 1 provided by the embodiment are as follows:

when the stratum pushing device is used, the stratum pushing device 1 is placed in a stratum hole, and then oil is supplied to the two pushing oil cylinders, so that the pushing oil cylinders extend. Because the inner cylinder 121 and the outer cylinder 123 of the pushing structure 12 can both slide relative to the housing 11, the pushing structure 12 can realize bidirectional pushing. In addition, because the pushing structures 12 are provided in this embodiment, one of them is arranged transversely, and the other is arranged longitudinally; therefore, the horizontal and longitudinal pushing can be realized, and the crushing efficiency is greatly improved. And due to the provision of the compression spring 126, it enables the pushing structure 12 to be fully retracted into the mounting hole 1121 (as in fig. 6), thereby facilitating removal of the formation pushing device 1 from the formation.

It should be noted that, in the formation pushing device 1 provided in this embodiment, the telescopic cylinder assembly 120 is exemplified by a three-stage cylinder, and in other embodiments, the number of sliding cylinders in the telescopic cylinder assembly 120 may be changed, for example, a four-stage cylinder. Alternatively, in other embodiments, the positioning members at both ends of the mounting hole 1121 and the barrel stopper 1231 are not limited to the annular plate 1151, and may be a stopper 1224. Alternatively, in other embodiments, two pushing structures 12 of the formation pushing device 1 may be disposed in a same direction, or only 1 pushing structure 12 may be disposed, or more than two pushing structures 12 may be disposed.

Example 2:

the present embodiment provides another rock strata pushing device 1 which has the same basic structure as that of embodiment 1, except that the telescopic cylinder assembly 120 in this embodiment is not provided with the intermediate cylinder 122, i.e. the telescopic cylinder assembly 120 is composed of the inner cylinder 121 and the outer cylinder 123.

The rear end of the outer wall of the inner cylinder 121 is also provided with an inner cylinder limiting part 1211, and when the pushing cylinder 127 stretches, the inner cylinder 121 is driven to move forwards until the inner cylinder limiting part 1211 abuts against the front positioning piece 114; at this time, the pushing cylinder 127 continues to extend to drive the outer cylinder 123 to move backward, so that pushing is performed at both sides simultaneously.

When the telescopic cylinder assembly 120 only has the inner cylinder 121 and the outer cylinder 123, the outer wall of the inner cylinder 121 may be provided with a relief plane 1221, and an installation space is formed between the relief plane 1221 and the inner wall of the outer cylinder 123 for installing the oil pipe 128.

Example 3:

referring to fig. 7, this embodiment provides another formation pushing device 1, which is substantially the same as the formation pushing device 1 of embodiments 1 and 2, except that the shape of the housing 11 is different. In the rock stratum pushing device 1 provided in this embodiment, only one pushing structure 12 is provided, the shape of the shell 11 is a circular cylinder, and the inner cavity through hole of the circular cylinder is the mounting hole 1121. The pushing structure 12 is arranged in the circular cylinder, and the two positioning pieces are annular plate-shaped and are connected with the two ends of the circular cylinder through bolts.

The rock stratum pushing device 1 provided by the embodiment is required to be installed on a fixing frame when in use, and the fixing frame is connected with a power device; the shape of the fixing frame can be a box body or a frame-shaped structure.

Example 4:

the present embodiment provides a formation pushing machine, which includes a power device and the formation pushing device 1 in embodiment 1, embodiment 2 or embodiment 3. The power plant may take a structure similar to an excavator, which includes a hydraulic system connected to an oil line 128 of the jack 127.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A formation pushing device, comprising:

the shell is provided with a mounting hole, and positioning pieces are respectively arranged at two ends of the mounting hole;

the pushing structure comprises a telescopic cylinder assembly and a pushing cylinder, wherein the telescopic cylinder assembly is of a telescopic cylindrical structure, a front sealing plate and a rear sealing plate are respectively arranged at two ends of the telescopic cylinder assembly, the pushing cylinder is arranged in the telescopic cylinder assembly, the small-diameter end of the pushing cylinder is connected with the front sealing plate, and the large-diameter end of the pushing cylinder is connected with the rear sealing plate;

the telescopic cylinder assembly is slidably arranged in the mounting hole, so that two ends of the telescopic cylinder can extend out of the mounting hole, and a cylinder limiting piece is arranged on the telescopic cylinder assembly; and the limiting parts at the two ends of the mounting hole are used for preventing the barrel limiting parts from falling out of the mounting hole.

2. The formation pushing device of claim 1, wherein: the telescopic cylinder assembly comprises an outer cylinder and an inner cylinder, the outer cylinder is slidably sleeved on the inner cylinder, the front sealing plate is arranged at the front end of the inner cylinder, the rear sealing plate is arranged at the rear end of the outer cylinder, and the inner cylinder and the outer cylinder are sleeved on the pushing cylinder;

the cylinder limiting piece is arranged in the middle of the outer cylinder or at one end of the outer cylinder far away from the rear sealing plate

Among the positioning pieces at the two ends of the mounting hole, when the pushing cylinder is completely recovered, a front positioning piece is close to the front sealing plate, and a rear positioning piece is close to the rear sealing plate;

the outer cylinder is also sleeved with a compression spring, one end of the compression spring is connected with the cylinder limiting piece, and the other end of the compression spring is connected with the rear positioning piece.

3. The formation pushing device of claim 2, wherein:

the telescopic cylinder assembly further comprises a middle cylinder, the middle cylinder is sleeved on the inner cylinder, and the outer cylinder is sleeved on the middle cylinder; the middle cylinder is in sliding fit with the inner cylinder, and the outer cylinder is in sliding fit with the middle cylinder.

4. The formation pushing device of claim 3, wherein:

an inner cylinder limiting part is arranged on the outer wall of the inner cylinder, an inner wall limiting part is arranged on the inner wall of the middle cylinder, and an outer wall limiting part is arranged on the outer wall of the middle cylinder; a stop block is further arranged at one end, close to the rear positioning piece, of the middle cylinder;

when the pushing cylinder stretches, the outer wall limiting part can be abutted with the front positioning piece, and the inner wall limiting part can be abutted with the inner cylinder limiting part; when the pushing cylinder is shortened, the rear end of the inner cylinder can be abutted with the stop block.

5. The formation pushing device of claim 2, wherein:

an inner cylinder limiting part is arranged on the outer wall of the inner cylinder, and when the pushing cylinder stretches, the inner cylinder limiting part can be abutted with the front positioning piece.

6. The formation pushing device of claim 2, wherein:

the rear positioning piece comprises an annular plate and a positioning cylinder which are connected with each other, the positioning cylinder is inserted into the mounting hole, and the compression spring is abutted with the inner end of the positioning cylinder; the annular plate is connected with the shell through screws;

the positioning cylinder is provided with a U-shaped groove which extends to the inner end of the positioning cylinder; a threaded through hole is formed in one side of the shell, and a positioning screw rod is arranged in the threaded through hole; the inner end of the positioning screw rod is positioned in the U-shaped groove.

7. The formation pushing device of claim 1, wherein:

the shell is of a cylindrical structure, and the inner cavity of the cylindrical structure forms the mounting hole.

8. The formation pushing device of claim 1, wherein:

the shell is box-shaped, a plurality of mounting holes are formed in the shell, and each mounting hole is internally provided with the pushing structure.

9. The formation pushing device of claim 8, wherein:

the telescopic directions of pushing cylinders in adjacent mounting holes are different.

10. A formation pushing machine comprising a power unit and a formation pushing device according to any one of claims 1 to 9, said formation pushing device being mounted on said power unit.