CN117145378B

CN117145378B - Reverse circulation impactor

Info

Publication number: CN117145378B
Application number: CN202311387112.2A
Authority: CN
Inventors: 杨日平; 朱自佳; 杨湘龙
Original assignee: Changsha Heijingang Industrial Co Ltd
Current assignee: Changsha Heijingang Industrial Co Ltd
Priority date: 2023-10-25
Filing date: 2023-10-25
Publication date: 2024-02-02
Anticipated expiration: 2043-10-25
Also published as: CN117145378A

Abstract

The application discloses a reverse circulation impactor comprising an outer cylinder; an inner cylinder sleeved in the outer cylinder; the shaft sleeve is sleeved in the inner cylinder, a first limiting surface is arranged on the outer surface of the shaft sleeve, and the first limiting surface is contacted with the rear end surface of the inner cylinder; the limiting structure is arranged between the outer cylinder and the inner cylinder and limits and constrains the inner cylinder to move in a direction away from the first limiting surface; the collecting tube is sleeved in the shaft sleeve and fixedly connected with the shaft sleeve; the joint is fixedly sleeved on the outer side of the collecting pipe and fixedly connected with the outer cylinder. Compared with the prior art, the reverse circulation impactor provided by the application has the advantages that the inner cylinder and the connector are arranged in a split mode, the processing difficulty is lower, and the processing cost can be reduced.

Description

Reverse circulation impactor

Technical Field

The present application relates to the field of drilling equipment, and more particularly, to a reverse circulation impactor.

Background

The commercial impactors are of two types, namely a down-the-hole positive circulation impacter, a drill rod is a single-layer pipe, high-pressure gas is blown into the impacter through the drill rod to enable a piston to move up and down to apply work, the high-pressure gas after the work flows into the bottom of a drilled hole through an inner hole airflow channel of the drill bit, rock slag is blown to the outside of the drill bit by the high-pressure gas at the bottom of the hole, then the rock slag is blown into a gap between the outer wall of the impacter and the wall of the drilled hole, and finally the rock slag is discharged out of a drilling hole; the other is a down-the-hole reverse circulation impactor, the drill rod is a double-layer pipe, high-pressure gas is blown into the impactor through the outer pipe of the drill rod, so that the piston moves up and down to apply work, the high-pressure gas after applying work is blown into the bottom of a drilled hole through the gas flow channel of the handle of the drill bit, the high-pressure gas at the bottom of the hole blows rock slag into the rock slag collecting hole in the drill bit, and then the rock slag is blown into the inner pipe of the drill rod through the collecting pipe, and finally the rock slag is collected through the dust collecting device of the drill machine.

In order to realize reciprocating motion of a piston, an inner cylinder is usually arranged to form a piston rear cavity, in order to fix the inner cylinder in an outer cylinder, the inner cylinder in the existing reverse circulation impactor is often connected with the outer cylinder through a conical screw thread by an integral structure of the joint, so that the inner cylinder is fixed in the outer cylinder, but because the piston reciprocates in the inner cylinder, the requirement on the wear resistance of the inner cylinder is high, a mode of carrying out surface heat treatment on the inner cylinder is often adopted in the prior art, but the requirement on the material of the joint in the reverse circulation impactor is not high, such as carrying out a heat treatment process on the inner cylinder and the joint together, the cost is high, and the processing is complex.

Therefore, there is a need for a reverse circulation impactor that is simpler in processing and can reduce processing costs.

Disclosure of Invention

For solving above-mentioned technical problem, this application provides a reverse circulation impacter, sets up inner cylinder and joint split type, and its processing degree of difficulty is lower, can reduce processing cost.

The technical scheme provided by the application is as follows:

a reverse circulation impactor comprising:

an outer cylinder;

an inner cylinder sleeved in the outer cylinder;

The shaft sleeve is sleeved in the inner cylinder, a first limiting surface is arranged on the outer surface of the shaft sleeve, and the first limiting surface is contacted with the rear end surface of the inner cylinder;

the limiting structure is arranged between the outer cylinder and the inner cylinder and limits and constrains the inner cylinder to move in a direction away from the first limiting surface;

the collecting tube is sleeved in the shaft sleeve and fixedly connected with the shaft sleeve;

the joint is fixedly sleeved on the outer side of the collecting pipe and fixedly connected with the outer cylinder.

Preferably, the limit structure includes:

an annular groove provided at an outer surface of the inner cylinder;

the limiting piece is sleeved in the annular groove, an assembly inner hole is arranged in the limiting piece, the assembly inner hole is matched with the annular groove for use, and the assembly inner hole is specifically of an aperture adjustable structure.

Preferably, the stopper is provided on an inner wall of the outer cylinder, the stopper is in contact with a front end surface of the stopper, and an aperture of the fitting inner hole is increased so that a contact area between the stopper and the front end surface of the stopper is increased.

Preferably, the method comprises the steps of,

the limiting piece includes:

the device comprises a limiting body, wherein one side of the limiting body is provided with an arc surface, one side of the limiting body, which is far away from the arc surface, is provided with assembly grooves, at least two limiting bodies are arranged, the arc surfaces are folded to form an assembly inner hole, the assembly inner hole is matched with the outer surface of the annular groove, and the assembly grooves are folded to form an annular groove;

The elastic ring is arranged in the annular groove and used for fixing the limiting body on the shaft sleeve.

Preferably, the limit structure further includes:

the expansion inclined surface is formed in the annular groove and is in contact with the arc-shaped surface, so that the limiting body moves in a direction away from the axis of the shaft sleeve and the contact area between the end surface of the limiting body and the stop block is increased;

the expansion inclined plane is arranged at one end of the annular groove, which is close to the joint, and the outer diameter of the expansion inclined plane is gradually reduced along the direction from the joint to the inner cylinder.

Preferably, a containing cavity is formed between the shaft sleeve and the collecting pipe, an air passage communicated with the containing cavity is formed in the shaft sleeve, an air hole communicated with the air passage is formed in the inner cylinder, an air gap is formed between the inner cylinder and the outer cylinder, and the air hole is communicated with the air gap.

Preferably, the method further comprises:

a first seal disposed between the inner cylinder and the sleeve;

and a second seal disposed between the sleeve and the collection tube.

Preferably, the method further comprises:

the connecting pipe assembly is sleeved on the outer side of the rear end of the collecting pipe and fixedly connected with the joint, and an air cavity is formed among the connecting pipe assembly, the joint and the collecting pipe;

The vent screen is sleeved in the connector, a second limiting surface contacted with the vent screen is arranged on the inner wall of the connector, and a vent hole is formed in the vent screen;

and a check valve assembly disposed between the vent screen and the connection pipe assembly, for opening and closing the air chamber.

Preferably, further comprising;

the mounting groove is arranged at one end of the shaft sleeve, which is close to the joint;

the buffer cushion is arranged in the mounting groove, and two ends of the buffer cushion are respectively contacted with the bottom of the mounting groove and the vent screen.

Preferably, an arc surface is arranged on the outer side of the front end surface of the cushion pad, a concave surface matched with the shape of the arc surface is arranged in the mounting groove, the inner diameter of the cushion pad is gradually increased, and the outer diameter of the cushion pad is reduced along the direction from the joint to the inner cylinder.

Preferably, the check valve assembly further comprises:

a check valve sleeved on the outer side of the collecting pipe, wherein a molding surface is arranged on the check valve and is matched with the inner surface of the joint to open and close the air cavity;

the elastic piece is fixedly connected with the check valve, and one end, far away from the check valve, of the elastic piece is abutted against the vent screen;

The vent screen is provided with a guide piece, and the guide piece is used for limiting and restraining the deformation direction of the elastic piece.

Preferably, the connection pipe assembly includes:

the body is sleeved outside the collecting pipe, and an annular mounting groove is formed in the outer circumferential surface of the body;

the sleeve is arranged on the outer side of the annular mounting groove, the positioning sleeve comprises positioning pieces and rubber rings, the positioning pieces are at least two, the positioning pieces are folded to form assembly holes and annular grooves, the assembly holes are matched with the annular mounting groove, and the rubber rings are arranged in the annular grooves and used for fixing the positioning pieces in the annular mounting groove.

According to the reverse circulation impactor provided by the invention, firstly, as the outer cylinder, the inner cylinder, the shaft sleeve and the limiting structure are arranged, and the inner cylinder and the joint are of a split structure, wherein the inner cylinder sleeve is arranged in the outer cylinder, the shaft sleeve is sleeved in the inner cylinder, the shaft sleeve is relatively fixed with the outer cylinder, the outer surface of the shaft sleeve is provided with the first limiting surface, the first limiting surface is abutted with the rear end surface of the inner cylinder and used for limiting and restraining the axial displacement of the inner cylinder, the limiting structure is arranged between the inner cylinder and the outer cylinder, the limiting structure is used for limiting and restraining the axial displacement of the inner cylinder in the direction far away from the first limiting surface, and the inner cylinder and the outer cylinder are fixed through the first limiting surface and the limiting structure. Secondly, in order to realize the relative fixation between axle sleeve and the outer jar, still be provided with collection pipe and joint, wherein, collection pipe suit is in the axle sleeve, and gathers pipe and axle sleeve fixed connection, and the joint suit is in the outside of collection pipe, and connects and gathers pipe fixed connection, connects and outer jar fixed connection, carries out relative fixation with axle sleeve and outer jar through joint, collection pipe. The reverse circulation impactor provided by the utility model has the advantages of separately producing inner cylinder and joint, its production technology is simpler, has reduced the cost of production and processing, fixes inner cylinder and outer cylinder through axle sleeve, first spacing face and limit structure, collection pipe and joint, simple structure, collection pipe and joint are current structure. Therefore, compared with the prior art, the reverse circulation impactor disclosed by the embodiment of the invention has the advantages that the connector and the inner cylinder are arranged into the split structure, the connector and the inner cylinder can be manufactured and processed separately, the difficulty of manufacturing and processing is lower, and the processing cost can be reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a reverse circulation impactor according to an embodiment of the present invention;

FIG. 2 is a schematic view of a partial enlarged view at A of FIG. 1;

FIG. 3 is a schematic view of a partial enlarged view at B of FIG. 1;

FIG. 4 is a schematic view of a partial enlarged view of FIG. 3C;

FIG. 5 is a schematic view of a structure with the inner hole of the retainer added;

FIG. 6 is a schematic structural view of a sleeve according to an embodiment of the present invention;

FIG. 7 is a schematic view of an inner cylinder according to an embodiment of the present invention;

FIG. 8 is a schematic view of a structure of the cross-sectional view of FIG. 7;

FIG. 9 is a schematic view showing a structure in which a stopper is installed at the outer side of an inner cylinder according to an embodiment of the present invention;

Fig. 10 is a schematic structural view of a limiting member according to an embodiment of the present invention;

FIG. 11 is a schematic view of the left side view of FIG. 10;

FIG. 12 is a schematic view of a vent screen according to an embodiment of the present invention;

FIG. 13 is a schematic view of a joint according to an embodiment of the present invention;

FIG. 14 is a schematic view of a connecting tube assembly according to an embodiment of the present invention;

FIG. 15 is a schematic structural view of a positioning sleeve according to an embodiment of the present invention;

FIG. 16 is a schematic view of the left side view of FIG. 15;

fig. 17 is a schematic structural diagram of a body according to an embodiment of the present invention.

Reference numerals: 1. an outer cylinder; 2. an inner cylinder; 3. a shaft sleeve; 4. a limit structure; 5. a collection tube; 6. a joint; 7. a connecting tube assembly; 8. ventilation screen; 9. a check valve assembly; 11. a ventilation gap; 21. air holes; 31. an airway; 32. a mounting groove; 33. a cushion pad; 34. a first seal; 35. a second seal; 36. a first limiting surface; 41. an annular groove; 42. a limiting piece; 43. assembling an inner hole; 44. a stop block; 45. expanding the inclined plane; 421. a limit body; 422. an arcuate surface; 423. an assembly groove; 425. an elastic ring; 61. the second limiting surface; 71. a body; 72. a positioning sleeve; 73. clamping springs; 74. a high pressure airway; 75. an annular mounting groove; 721. a positioning piece; 722. a rubber ring; 723. a fitting hole; 724. an annular groove; 81. a vent hole; 91. a non-return valve; 92. an elastic member; 93. a guide member; 911. molding surface, 94 and guide post; 912. a rigid body; 913. a check valve joint; 914. a seal ring;

20. A piston; 30. a drill bit; 40. a drill rod clamping sleeve; 50. a bushing; 60. a first chamber; 70. a second chamber.

Detailed Description

In order to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" or "a number" is two or more, unless explicitly defined otherwise.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the scope of the present disclosure, since any structural modifications, proportional changes, or dimensional adjustments made by those skilled in the art should not be made in the present disclosure without affecting the efficacy or achievement of the present disclosure.

The embodiment of the invention is written in a progressive manner.

It should be noted that, for convenience of description, the front and rear of the present invention are named according to the placement position of the impactor during use, and the "front end" in the present invention refers to the end of the impactor near the percussion bit, and the "rear end" refers to the end of the impactor near the joint.

As shown in fig. 1 to 17, an embodiment of the present invention provides a reverse circulation impactor comprising: an outer cylinder 1; an inner cylinder 2 sleeved in the outer cylinder 1; the shaft sleeve 3 is sleeved in the inner cylinder 2, a first limiting surface 36 is arranged on the outer surface of the shaft sleeve 3, and the first limiting surface 36 is in contact with the rear end surface of the inner cylinder 2; a limiting structure 4 arranged between the outer cylinder 1 and the inner cylinder 2 for limiting and restraining the inner cylinder 2 from moving in a direction away from the first limiting surface 36; the collecting tube 5 is sleeved in the shaft sleeve 3 and fixedly connected with the shaft sleeve 3; the joint 6 is fixedly sleeved on the outer side of the collecting pipe 5, and the joint 6 is fixedly connected with the outer cylinder 1.

The inner cylinder is of a thin-wall structure, the space inside the outer cylinder is limited, and the inner cylinder is stably fixed in the outer cylinder, which is a technical difficulty in the industry. The reverse circulation impactor with the inner cylinder guides the axial movement of the piston through the inner cylinder, if relative movement occurs between the inner cylinder and the outer cylinder, friction and abrasion are easy to occur between the inner cylinder and the outer cylinder, so that the problems of falling pressure of the impactor, abrasion or crack of the inner cylinder and even piston fracture are caused, and the service performance of the down-the-hole impactor is affected. The inner cylinder in the existing reverse circulation impactor is often in an integrated structure with the joint, the inner cylinder is fixed inside the outer cylinder through connection between the joint and the outer cylinder through conical threads, but because the piston moves in the inner cylinder in a high-frequency reciprocating manner, the requirement on the wear resistance of the inner cylinder is high, a surface heat treatment mode for the inner cylinder is often adopted in the prior art, but the requirement on the material of the joint in the reverse circulation impactor is not high, such as the heat treatment process is carried out on the inner cylinder and the joint together, the cost is high, and the processing is complex. The inner cylinder is of an elongated thin-wall structure, the joint is connected with the outer cylinder, the processing difficulty is high, and the required materials are more.

In order to solve the above technical problems, according to the reverse circulation impactor provided by the invention, firstly, the outer cylinder 1, the inner cylinder 2, the shaft sleeve 3 and the limiting structure 4 are arranged, and the inner cylinder 2 and the joint 6 are of a split structure, wherein the inner cylinder 2 is sleeved in the outer cylinder 1, the shaft sleeve 3 is sleeved in the inner cylinder 2, the shaft sleeve 3 and the outer cylinder 1 are relatively fixed, the outer surface of the shaft sleeve 3 is provided with the first limiting surface 36, the first limiting surface 36 is abutted with the rear end surface of the inner cylinder 2 and used for limiting and restraining the axial displacement of the inner cylinder 2, the limiting structure 4 is arranged between the inner cylinder 2 and the outer cylinder 1, the limiting structure 4 is used for limiting and restraining the axial displacement of the inner cylinder 2 in the direction far away from the first limiting surface 36, and the inner cylinder 2 and the outer cylinder 1 are fixed through the first limiting surface 36 and the limiting structure 4. Secondly, in order to realize the relative fixation between the shaft sleeve 3 and the outer cylinder 1, the collecting pipe 5 is sleeved in the shaft sleeve 3, the collecting pipe 5 is fixedly connected with the shaft sleeve 3, the joint 6 is sleeved on the outer side of the collecting pipe 5, the joint 6 is fixedly connected with the outer cylinder 1, and the shaft sleeve 3 and the outer cylinder 1 are relatively fixed through the joint 6 and the collecting pipe 5. The reverse circulation impactor provided by the utility model has the advantages of separately producing inner cylinder 2 and joint 6, its production technology is simpler, has reduced the cost of production and processing, fixes inner cylinder 2 and outer cylinder 1 through axle sleeve 3, first spacing face 36 and limit structure 4, collection pipe 5 and joint 6, and simple structure gathers pipe 5 and joint 6 and is current structure. Therefore, compared with the prior art, the reverse circulation impactor disclosed by the embodiment of the invention has the advantages that the joint 6 and the inner cylinder 2 are arranged to be of a split structure, the joint 6 and the inner cylinder 2 can be manufactured and processed separately, the difficulty of manufacturing and processing is lower, and the processing cost can be reduced.

It should be emphasized that, when viewed in the radial direction, the inner cylinder 2 is fitted between the sleeve 3 and the outer cylinder 1, and on the one hand, displacement of the inner cylinder 2 in the radial direction can be restrained by the sleeve 3, and on the other hand, when viewed in the axial direction, the rear end of the inner cylinder 2 abuts against the first stopper surface 36, and movement of the inner cylinder 2 in a direction away from the first stopper surface 36 is restrained by the stopper structure, so that radial and axial play of the inner cylinder 2 in the outer cylinder can be prevented.

Secondly, in the embodiment of the invention, the shaft sleeve 3 is fixedly sleeved on the outer side of the collecting pipe, the joint 6 is fixedly sleeved on the outer side of the collecting pipe 5, and the joint 6 is fixedly connected with the outer cylinder 1, so that the relative fixation between the shaft sleeve 3 and the outer cylinder 1 is realized, the structures of the existing outer cylinder and the collecting pipe are not changed, and the universality is higher.

According to the reverse circulation impactor provided by the embodiment of the invention, the joint 6 and the inner cylinder 2 are arranged to be of a split structure, so that the joint 6 and the inner cylinder 2 can be manufactured and processed separately, the difficulty of manufacturing and processing is lower, and the processing cost can be reduced. On the other hand, through setting up axle sleeve 3, axle sleeve 3 passes through collection pipe 5, connect 6 and outer jar 1 fixed connection, and interior jar 2 cover is established between axle sleeve 3 and outer jar 1, restraines the radial float of interior jar 2 through axle sleeve 3, and the both ends of interior jar 2 are spacing through first spacing surface 36 and limit structure 4 axial respectively, retrains the axial displacement of interior jar 2, so can be better realize the fixed between interior jar 2 and the outer jar 1, avoids producing relative float between the relative outer jar 1 of interior jar 2, avoids causing the influence to the performance of impacter.

In the above structure, as a first way, the limiting structure 4 in the embodiment of the present invention includes the first limiting member and the second limiting member, where the first limiting member is disposed on the inner wall of the outer cylinder, the second limiting member is disposed on the outer surface of the inner cylinder, and the first limiting member contacts with the second limiting member to limit the axial displacement of the inner cylinder.

Further, as a second embodiment, as shown in fig. 3, the limiting structure 4 in the embodiment of the present invention includes a limiting member 42 and an annular groove 41, wherein the annular groove 41 is disposed on the outer surface of the sleeve 3, an assembling inner hole 43 is disposed in the limiting member 42, the assembling inner hole 43 is matched with the annular groove 41 for use, on one hand, the axial displacement of the limiting member 42 is limited by the annular groove 41, the assembling inner hole 43 is specifically an aperture-adjustable structure, and by adjusting the aperture of the assembling inner hole 43, the contact area between the limiting member 42 and the outer cylinder 1 is increased, so as to limit and restrict the axial displacement of the inner cylinder 2 in a direction away from the first limiting surface 36; on the other hand, since the space between the outer cylinder 1 and the inner cylinder 2 is limited, the limiting structure 4 is provided between the outer cylinder 1 and the inner cylinder 2, and the use strength of the outer cylinder 1 and the inner cylinder 2 is not affected while the limiting structure 4 is conveniently installed, and the limiting member 42 is sleeved outside the annular groove 41, so that the need of reducing the diameter of the inner cylinder 2 or the wall thickness of the outer cylinder 1 due to the fact that the limiting member 42 is provided is avoided.

In the above-described structure, as a first embodiment thereof, the stopper 42 may be directly expanded by increasing the diameter of the fitting inner hole 43, increasing the contact area between the circumferential surface of the stopper 42 and the inner wall of the outer cylinder 1, and achieving fixation between the outer surface of the stopper 42 and the outer cylinder 1.

As a second embodiment, as shown in fig. 4 and 5, the limiting structure 4 in the embodiment of the present invention further includes a stopper 44, where the stopper 44 is disposed on the inner wall of the outer cylinder 1, the stopper 44 contacts the front end surface of the limiting member 42, the aperture of the assembly inner hole 43 is increased, the contact area between the stopper 44 and the front end surface of the limiting member 42 is increased, and two ends of the limiting member 42 are axially limited by the first limiting stopper and the stopper 44, so as to fix the inner cylinder 2 and the outer cylinder 1.

Further, as one embodiment, the stopper 44 and the outer cylinder 1 in the embodiment of the present invention are specifically formed integrally.

Furthermore, the inner cylinder 2 is sleeved on the outer side of the shaft sleeve 3, the limiting piece 42 is installed in the annular groove 41, when the collecting pipe 5, the shaft sleeve 3, the limiting piece 42 and the inner cylinder 2 are integrally installed in the outer cylinder 1, in an initial state, the outer diameter of the limiting piece 42 is slightly larger than the inner diameter of the stop block 44, the assembly inner hole 43 of the limiting piece 42 is adjusted, the contact area between the front end surface of the limiting piece 42 and the stop block 44 is increased, and the inner cylinder of the reverse circulation impactor is prevented from moving.

In the above structure, as shown in fig. 7 and 10, as a specific implementation manner, the limiting member 42 in the embodiment of the present invention includes the limiting body 421 and the elastic ring 425, where one side of the limiting body 421 is provided with the arc surface 422, one side of the limiting body 421 away from the arc surface 422 is provided with the assembling groove 423, the assembling groove 423 is concavely formed towards the arc surface, the limiting body 421 is provided with at least two, the arc surfaces 422 are folded to form the assembling inner hole 43, the assembling inner hole 43 is adapted to the outer surface of the annular groove 41, the assembling groove 423 is folded to form the annular groove, the elastic ring 425 is placed in the annular groove, the limiting body 421 is fixed in the annular groove 41 by the elastic ring 425, when the diameter of the assembling inner hole 43 increases, the limiting body 421 moves in a direction away from the center of the limiting member 42, so that the elastic ring 425 generates elastic deformation, the contact area between the end surface of the limiting member 42 and the stop block 44 is larger, and the inner cylinder 2 is prevented from moving in the outer cylinder 1 during the working process. The limiting body 421 is fixed in the annular groove 41 through the elastic ring 425, and the limiting piece 42 is more convenient to install. More specifically, three limiting bodies 421 in the embodiment of the present invention are provided, and the three limiting bodies 421 are folded and fixed by an elastic ring 425 to form the limiting member 42.

In the above-described structure, as one of the embodiments, the elastic ring 425 in the embodiment of the present invention is specifically an O-ring.

It should be noted that, the core of the present invention is that the inner hole 43 of the limiting member 42 is an adjustable hole diameter structure, and the hole diameter of the inner hole 43 is adjusted, so that the limiting member 42 and the inner wall of the outer cylinder 1 are relatively fixed. The construction of the aperture that can be varied by changing the fitting bore 43 is within the scope of the present application.

In the above structure, as one of the embodiments, the limit structure 4 in the embodiment of the present invention further includes the expansion inclined surface 45, wherein the expansion inclined surface 45 is formed in the annular groove 41, and the expansion inclined surface 45 is in contact with the arc surface 422, the limit body 421 moves in a direction in which the outer diameter of the expansion inclined surface 45 increases, so that the limit body 421 moves in a direction away from the axis thereof, the assembly inner hole 43 is used in cooperation with the expansion inclined surface 45, and the aperture of the assembly inner hole 43 is adjusted; the expansion slope 45 is provided at one end of the annular groove 41 near the joint 6, and the outer diameter of the expansion slope 45 is tapered in the direction from the joint 6 to the inner cylinder 2.

Specifically, in the initial state, as shown in fig. 4, when the limiting member 42 is installed in the annular groove 41, the outer diameter of the limiting member 42 is slightly larger than the inner diameter of the stop block 44, the inner cylinder 2 further moves along the axial direction of the outer cylinder 1, the expansion inclined surface 45 is matched with the assembly inner hole 43 to expand the assembly inner hole 43, and as shown in fig. 5, the contact area between the end surface of the limiting member 42 and the stop block 44 is increased, so that the inner cylinder 2 is better axially positioned.

In the above structure, as one of the embodiments, a receiving cavity is formed between the shaft sleeve 3 and the collecting tube 5 in the embodiment of the present invention, the shaft sleeve 3 is provided with the air channel 31, the air channel 31 is communicated with the receiving cavity, the inner cylinder 2 is provided with the air hole 21, the air hole 21 is used for communicating with the air channel 31, the air vent 11 is arranged between the inner cylinder 2 and the outer cylinder 1, the air hole 21 communicates the air channel 31 and the air vent 11, and the high-pressure gas enters into the impactor through the receiving cavity, the air channel 31, the air hole 21 and the air vent 11 to push the piston to reciprocate in the inner cylinder 2.

In the above-described structure, as one of the embodiments, the reverse circulation impactor of the present embodiment further includes the first seal 34 and the second seal 35, wherein the first seal 34 is disposed between the inner cylinder 2 and the sleeve 3, the second seal 35 is disposed between the sleeve 3 and the collecting tube 5, and leakage of high-pressure gas from the installation gap between the inner cylinder 2 and the sleeve 3 is avoided by providing the first seal 34, and leakage of high-pressure gas from the gap between the sleeve 3 and the collecting tube 5 is avoided by providing the second seal 35.

In the above structure, as one of the embodiments of the present invention, the reverse circulation impactor further includes the connecting pipe assembly 7, the vent screen 8 and the check valve assembly 9, wherein the connecting pipe assembly 7 is sleeved outside the rear end of the collecting pipe 5, the connecting pipe assembly 7 is fixedly connected with the joint 6, an air cavity is formed between the connecting pipe assembly 7, the joint 6 and the collecting pipe 5, the vent screen 8 is sleeved in the joint 6, the joint 6 is provided with the second limiting surface 61 limiting and restraining the axial displacement of the vent screen 8, and the vent screen 8 is provided with the vent hole 81, the check valve assembly 9 is arranged between the vent screen 8 and the connecting pipe assembly 7, and the air cavity is opened and closed by the check valve assembly 9, since the vent screen 8 is arranged at the end of the check valve assembly 9 away from the connecting pipe assembly 7, firstly, the vent hole 81 arranged on the vent screen 8 can filter the impurities in the high-pressure gas, thereby avoiding the impurities from entering the interior of the reverse circulation impactor, and affecting the usability of the reverse circulation impactor. Secondly, because the check valve assembly 9 is arranged at one end of the vent screen 8 far away from the connecting pipe assembly 7, the vent screen 8 can be used as a mounting seat of the check valve assembly 9, and the check valve seat is not required to be additionally arranged, so that the structure of the down-the-hole hammer is more compact.

The reverse circulation impactor provided by the embodiment of the invention further comprises a piston 20 and a drill bit 30, wherein the piston 20 is sleeved on the outer side of the collecting tube 5, the piston 20 is movably sleeved in the inner cylinder 2, the drill bit 30 is installed at the front end of the drill bit 30 through a drill clamping sleeve 40, a bushing 50 is fixedly arranged in the outer cylinder 1, a first chamber 60 is formed among the piston 20, the shaft sleeve 3, the outer cylinder 1 and the collecting tube 5, a second chamber 70 is formed among the piston 20, the bushing 50, the outer cylinder 1 and the drill bit 30, a drill rod is connected with the rear end of the joint 6, an inner pipe of the drill rod is communicated with the collecting tube 5 through a body, an outer pipe of the drill rod is communicated with an air cavity, high-pressure air is input into the air cavity through the outer pipe of the drill rod, the high-pressure air acts on the check valve assembly 9 through a high-pressure air channel, the check valve assembly 9 is opened under the action of the high-pressure air, the high-pressure air enters into a ventilation gap through a ventilation hole on the ventilation screen 8, the piston 20 is abutted with the drill bit 30 in an initial state, the gap is communicated with the second chamber 70, the air cavity is pushed by the second chamber 70, the piston 20 is pushed towards the direction of the joint 20 to be blown out of the high-pressure chamber 20 along with the air cavity in the direction of the collecting tube 60. When the piston 20 moves to the first position, the ventilation gap is communicated with the first chamber 60, the first chamber 60 is isolated from the gap between the piston 20 and the collecting pipe 5, and as the air pressure in the first chamber 60 increases, the piston 20 is pushed to move towards the drill bit 30 under the action of the air pressure difference between the first chamber 60 and the second chamber 70, and the air in the second chamber 70 is discharged through the exhaust channel to blow slag.

In the above structure, the contact between the joint 6 and the shaft sleeve 3 belongs to rigid contact, which has a larger influence on the service life of the parts, and the phenomenon that the shaft sleeve 3 is broken is likely to occur, the reverse circulation impactor provided by the embodiment of the invention is also provided with the buffer pad 33, the buffer pad 33 is sleeved on the outer side of the collecting tube 5, and two ends of the buffer pad 33 are respectively contacted with the bottom of the mounting groove 32 and the vent screen 8. Due to the buffer cushion 33, the buffer cushion 33 for transitional impact force is arranged between the shaft sleeve 3 and the joint 6, so that the contact between the joint 6 and the shaft sleeve 3 is changed from rigid contact to elastic contact, and the impact force on parts inside the reverse circulation impactor is greatly reduced.

Still further, the reverse circulation impactor according to the embodiment of the present invention further includes a mounting groove 32, the mounting groove 32 is disposed at an end of the sleeve 3 near the joint 6, and the cushion 33 is sleeved in the mounting groove 32, and the radial displacement of the cushion 33 is limited by the mounting groove 32 and the collecting tube 5.

In the above-described structure, as one of the embodiments, the outer side of the front end surface of the cushion pad 33 in the embodiment of the present invention is provided with the circular arc surface, the concave surface is provided in the mounting groove 32, the shape of the concave surface is adapted to the shape of the circular arc surface, the inner diameter of the cushion pad 33 is increased in the direction from the joint 6 to the inner cylinder 2, the outer diameter of the cushion pad 33 is tapered, the circular arc surface on the outer surface of the front end of the cushion pad 33 is abutted against the concave surface, the lower end surface of the rear end of the cushion pad 33 is abutted against the vent screen 8, the cushion pad 33 is obliquely provided between the vent screen 8 and the boss 3, and thus the deformability of the cushion pad 33 is stronger.

Still further, the cushion pad 33 in the embodiment of the present invention is specifically made of a spring steel material.

More specifically, the cushion pad 33 in the embodiment of the present invention is preferably a disc spring.

Further, as shown in fig. 12, the vent screen 8 in the embodiment of the present invention is specifically a disc structure, and the vent screen 8 is provided with ventilation holes 81 at intervals. The vent screen 8 is sleeved on the outer side of the collecting pipe, a first limiting step is arranged on the collecting pipe 5, the axial displacement of the front end face of the vent screen 8 is restrained through the first limiting step, the joint is sleeved on the outer side of the vent screen, a second limiting step is arranged on the inner wall of the joint, the second limiting step is abutted with the rear end face of the vent screen, and accordingly the vent screen 8 is fixed.

In the above structure, as one of the embodiments, the check valve assembly 9 according to the present invention includes the check valve 91, the elastic member 92 and the guide member 93, where the check valve 91 is sleeved on the outer side of the collection tube 5, the check valve 91 is provided with the molding surface 911, the molding surface 911 is adapted to the inner surface of the outer cylinder 1 to open and close the air cavity, the elastic member 92 is fixedly connected with the check valve 91, one end of the elastic member 92 away from the check valve 91 abuts against the vent screen 8, the guide member 93 is provided on the vent screen 8, the direction of deformation of the elastic member 92 is limited by the guide member 93, the guide member 93 is provided on the vent screen 8, one end of the elastic member 92 is fixedly provided on the vent screen 8, the elastic member 92 is supported by the vent screen 8, no separate check valve seat is required, the structure of the reverse circulation impactor is more compact, the guide member 93 is provided on the vent screen 8, the direction of elastic deformation of the elastic member 92 is prevented from being deviated, the positioning of the elastic member 92 is more reliable, and the elastic member 92 is prevented from being biased.

Further, the guide member 93 in the embodiment of the present invention is specifically a cylindrical guide rod or a guide groove, when the guide member 93 is a cylindrical guide rod, the cylindrical guide rod extends toward the direction of the check valve, the elastic member is sleeved on the outer side of the cylindrical guide rod, and the deformation direction of the elastic member 92 is limited by the outer circumferential surface of the cylindrical guide rod. When the guide member 93 is specifically a guide groove, the elastic member 92 is disposed in the guide groove, and the inner wall of the guide groove limits the direction in which the elastic member deforms.

Furthermore, in order to make the structure in the joint more compact, in the above structure, the vent screen 8 in the embodiment of the present invention is provided with a groove, the circumferential guide rod is disposed in the groove, the elastic member is sleeved on the outer side of the cylindrical guide rod, the end surface of the elastic member 92 abuts against the bottom surface of the groove, and the installation of the elastic member 92 is more stable.

In the above-described structure, as the check valve assembly 9 therein, further comprising: a guide post 94 provided on the check valve 91 and extending in the direction of the vent screen 8, and an elastic member 92 fitted over the guide post 94. The elastic piece 92 is sleeved on the guide post 94, high-pressure gas acts on the check valve 91 to push the check valve 91 to move towards the direction of the inner cylinder 2, the elastic piece 92 generates compression deformation, when the action of the high-pressure gas stops, the elastic piece 92 elastically resets to push the check valve 91 to close the air cavity, and due to the guide post 94, the elastic piece 92 compressively deforms and elastically resets along the length direction of the guide post 94, and deformation generated by elasticity is avoided.

The forming surface 911 is specifically a tapered forming surface, the outer diameter of which increases toward the vent screen 8; and a matching inclined plane which is arranged on the inner wall of the joint 6 and matched with the conical forming surface for use.

Furthermore, in order to better close the air cavity and avoid leakage between the high-pressure air connector 6 and the check valve 91, as one embodiment of the present invention, the check valve 91 includes a rigid body 912 and a check valve connector 913, wherein the check valve connector 913 is fixedly disposed on the outer side of the rigid body 912, a tapered molding surface is disposed on the outer surface of the check valve connector 913, the check valve connector 913 is made of a flexible material, and the high-pressure air is better sealed by contacting the tapered molding surface on the check valve connector 913 with a mating inclined surface on the connector 6.

Still further, the check valve assembly of the present embodiment further comprises a sealing ring 914, wherein the sealing ring 914 is disposed between the rigid body 912 and the collection tube 5.

In the above-described structure, as one of the embodiments, the elastic member 92 in the embodiment of the present invention is specifically a spring.

As shown in fig. 13 to 17, the connection pipe assembly 7 in the embodiment of the present invention includes a body 71 and a positioning sleeve 72, wherein an annular mounting groove 75 is provided on an outer circumferential surface of the body 71, and the positioning sleeve 72 is detachably sleeved outside the annular mounting groove 75. Because the positioning sleeve 72 is detachably connected with the body 71, the friction between the inner wall of the channel and the residue generates abrasion, and the positioning sleeve 72 is not required to be replaced by replacing the body 71, so that the positioning sleeve 72 is more convenient to replace, and the maintenance cost is lower. Secondly, the positioning sleeve 72 comprises positioning members 721 and rubber rings 722, wherein the positioning members 721 are at least two, the positioning members 721 are folded to form an assembly hole 723 and an annular groove 724, the assembly hole 723 is matched with the annular mounting groove 75, the positioning sleeve 72 can be sleeved outside the annular mounting groove 75, the annular groove 724 is used for being matched with the rubber rings 722, and the rubber rings 722 are placed in the annular groove 724 and used for fixing the positioning members 721 in the annular mounting groove 75. At least two positioning members 721 are fixed in the annular mounting groove 75 through the rubber ring 722, when the body 71 needs to be replaced, the body 71 can be replaced by taking the rubber ring 722 out of the annular groove 724, the positioning members 721 do not need to be replaced, the replacement cost is lower, and secondly, the positioning members 721 and the body 71 are manufactured separately, so that the manufacturing difficulty is low and the manufacturing cost is low. It can be seen that the connecting tube assembly 7 of the present embodiment is simpler to manufacture and less costly to maintain than the prior art.

In the above-described structure, as one specific embodiment, the cross-sectional shape of the annular mounting groove 75 in the embodiment of the present invention is specifically circular, and the fitting hole 723 formed by folding the positioning member 721 in the embodiment of the present invention is also circular. And the fitting hole 723 has a diameter equal to the outer diameter of the annular mounting groove 75 so that the positioning member 721 is fitted in the annular groove without radial runout.

In the above-mentioned structure, as one of the embodiments, the positioning sleeve 72 in the embodiment of the present invention is provided with the high-pressure air channel 74, the high-pressure air channel 74 is disposed through along the axial direction of the positioning sleeve 72, and the high-pressure air channel 74 is used for high-pressure air to enter the air cavity. Further, at least two high-pressure air passages 74 are provided in the embodiment of the present invention, the high-pressure air passages 74 extend along the length direction of the positioning member 721, and are used for communicating the outer tube of the drill rod with the inside of the joint 6, and the high-pressure air passages 74 are arranged at intervals along the circumferential direction of the positioning sleeve 72.

Still further, the number of high-pressure air passages 74 provided in the embodiment of the present invention is specifically 8 to 20.

In the above-described structure, as one of the embodiments, the fitting hole 723 in the embodiment of the present invention is provided in the positioning sleeve 72, and the annular groove 724 is provided on the outer surface of the positioning sleeve 72. In the mounting process, the positioning sleeve 72 is sleeved on the outer side of the annular mounting groove 75 of the body 71, and the rubber ring 722 is sleeved in the annular groove 724, so that the positioning element 721 is fixed in the annular mounting groove 75 of the body 71. At the time of disassembly, the rubber ring 722 is removed from the annular groove 724.

In the above structure, in order to enable the positioning sleeve 72 to be more firmly sleeved in the annular mounting groove 75 of the body 71, as one embodiment, the inner hole diameter of the rubber ring 722 in the embodiment of the present invention is not larger than the outer diameter of the annular groove 724, because the rubber ring 722 has a certain deformability, the rubber ring 722 is elastically deformed by the application of an external force to the rubber ring 722, the inner hole diameter of the rubber ring 722 is enlarged, and in the case that the inner hole diameter of the rubber ring 722 is large, the rubber ring 722 is sleeved in the annular groove 724, and the positioning element 721 is fixed in the annular mounting groove 75 of the body 71 by the deformation resetting action of the rubber ring 722. If the bore diameter of the rubber ring 722 is larger than the outer diameter of the annular groove 724, the rubber ring 722 will not exert force on the positioning element 721 after being mounted in the annular groove 724, and the positioning element 721 will be easily separated from the annular mounting groove 75.

Further, in the embodiment of the present invention, the cross-sectional shape of the annular groove 724 is circular arc, the cross-sectional shape of the rubber ring 722 is circular, the diameter of the rubber ring 722 is smaller than the cross-sectional size of the annular groove 724, and the depth of the annular groove 724 is not larger than the diameter of the rubber ring 722. In this way, the installation of the positioning sleeve 72 is facilitated, while the rubber ring 722 is more conveniently removable from the annular recess 724.

Further, the rubber ring 722 in the embodiment of the present invention is specifically an O-ring.

As shown in fig. 15 and 16, as one specific embodiment, two positioning members 721 are provided in the embodiment of the present invention, a first arc surface adapted to the outer surface of the annular mounting groove 75 is provided on the first positioning member, a first mounting groove is provided on a side of the first positioning member away from the first arc surface, a second arc surface and a second mounting groove are provided on the second positioning member, wherein the first arc surface and the second arc surface are folded to form an assembly hole 723, and the first mounting groove and the second mounting groove are folded to form an annular groove 724.

In the above-described structure, the annular mounting groove 75 in the embodiment of the present invention is specifically formed by recessing the surface of the body 71 toward the direction of the center line of revolution of the body 71.

In the above structure, as one of the embodiments, the connecting pipe assembly 7 in the embodiment of the present invention further includes a first axial positioning surface and a second axial positioning surface, where the first axial positioning surface and the second axial positioning surface are respectively disposed at two sides of the annular mounting groove 75, the positioning sleeve 72 is sleeved outside the annular mounting groove 75, and two ends of the positioning sleeve 72 are respectively in contact with the first axial positioning surface and the second axial positioning surface, and movement of the positioning sleeve 72 in the axial direction is limited by the first axial positioning surface and the second axial positioning surface.

In the above structure, as one of the embodiments, the connecting pipe assembly 7 in the embodiment of the present invention further includes a positioning surface disposed on an inner wall of the joint 6, the positioning surface abuts against one end of the positioning sleeve 72, the inner wall of the joint 6 is further provided with the clamp spring 73, the clamp spring 73 is detachably disposed on the inner wall of the joint 6, the clamp spring 73 contacts with one end of the positioning sleeve 72 far away from the positioning surface, and the positioning sleeve 72 and the body 71 are fixed in the joint 6 through the positioning surface and the clamp spring 73. In addition, because jump ring 73 can dismantle with the inner wall that connects 6 and be connected, jump ring 73 sets up in the one side that connects 6 kept away from outer cylinder 1, when changing body 71, need not to dismantle joint 6 from outer cylinder 1 just can realize the change to the connecting pipe, and the dismouting is more convenient.

More specifically, the connection pipe assembly 7 in the embodiment of the present invention further includes: the snap spring groove is formed in the inner wall of the joint 6, the snap spring 73 is arranged in the snap spring groove, the end face of the positioning sleeve 72 is axially limited through the end face of the snap spring 73, the snap spring 73 is of an open arc structure, and the snap spring 73 is made of a spring steel material.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reverse circulation impactor comprising:

an outer cylinder (1);

an inner cylinder (2) sleeved in the outer cylinder (1);

the shaft sleeve (3) is sleeved in the inner cylinder (2), a first limiting surface is arranged on the outer surface of the shaft sleeve (3), and the first limiting surface is in contact with the rear end surface of the inner cylinder (2);

a limiting structure (4) arranged between the outer cylinder (1) and the inner cylinder (2) and limiting and restraining the inner cylinder (2) to move in a direction away from the first limiting surface;

the collecting tube (5) is sleeved in the shaft sleeve (3) and fixedly connected with the shaft sleeve (3);

a joint (6) fixedly sleeved on the outer side of the collecting pipe (5), and the joint (6) is fixedly connected with the outer cylinder (1);

the limit structure (4) comprises:

an annular groove (41) provided on the outer surface of the inner cylinder (2);

the limiting piece (42) is sleeved in the annular groove (41), an assembly inner hole (43) is formed in the limiting piece (42), the assembly inner hole (43) is matched with the annular groove (41) for use, and the assembly inner hole (43) is specifically of an aperture-adjustable structure.

2. The reverse circulation impactor of claim 1, wherein,

And a stopper (44) provided on the inner wall of the outer cylinder (1), the stopper (44) being in contact with the front end surface of the stopper (42), the aperture of the fitting inner hole (43) being increased so that the contact area between the stopper (44) and the front end surface of the stopper (42) is increased.

3. The reverse circulation impactor of claim 2, wherein,

the limiting member (42) includes:

the limiting device comprises a limiting body (421), wherein an arc-shaped surface (422) is arranged on one side of the limiting body (421), an assembling groove (423) is formed in one side, far away from the arc-shaped surface (422), of the limiting body (421), at least two limiting bodies are arranged on the limiting body (421), the arc-shaped surfaces (422) are folded to form an assembling inner hole (43), the assembling inner hole (43) is matched with the outer surface of the annular groove (41), and the assembling groove (423) is folded to form an annular groove;

and an elastic ring (425) arranged in the annular groove and used for fixing the limit body (421) in the annular groove (41).

4. The reverse circulation impactor of claim 3, wherein,

the limit structure (4) further comprises:

An expanding inclined surface (45) formed in the annular groove (41), the expanding inclined surface (45) being in contact with the arc-shaped surface (422) so that the limit body (421) moves in a direction away from the axis of the annular groove (41) for increasing a contact area between an end surface of the limit body (421) and the stopper (44);

the expansion inclined surface (45) is arranged at one end of the annular groove (41) close to the joint (6), and the outer diameter of the expansion inclined surface (45) is gradually reduced along the direction from the joint (6) to the inner cylinder (2).

5. The reverse circulation impactor of claim 1, wherein,

the air-vent type gas collection device comprises a shaft sleeve (3), a collection tube (5) and an air hole (21) which is formed between the shaft sleeve (3) and the collection tube (5), wherein the shaft sleeve (3) is provided with an air passage (31) which is communicated with the air passage (31), the inner cylinder (2) is provided with the air hole (21) which is communicated with the air passage (31), a ventilation gap (11) is formed between the inner cylinder (2) and the outer cylinder (1), and the air hole (21) is communicated with the ventilation gap (11).

6. The reverse circulation impactor of claim 1, wherein,

further comprises:

A first seal arranged between the inner cylinder (2) and the sleeve (3);

and a second sealing element arranged between the shaft sleeve (3) and the collecting pipe (5).

7. The reverse circulation impactor of any one of claims 1 to 6,

further comprises:

the connecting pipe assembly (7) is sleeved on the outer side of the rear end of the collecting pipe (5) and fixedly connected with the joint (6), and an air cavity is formed among the connecting pipe assembly, the joint and the collecting pipe;

the ventilation screen (8) is sleeved in the joint (6), a second limiting surface (61) contacted with the ventilation screen (8) is arranged on the inner wall of the joint (6), and a ventilation hole (81) is formed in the ventilation screen (8);

a check valve assembly (9) arranged between the vent screen (8) and the connecting pipe assembly (7), wherein the check valve assembly (9) is used for opening and closing the air cavity.

8. The reverse circulation impactor of claim 7, wherein,

also comprises;

a mounting groove (32) arranged at one end of the shaft sleeve (3) close to the joint (6);

and the buffer cushion (33) is arranged in the mounting groove (32), and two ends of the buffer cushion (33) are respectively contacted with the bottom of the mounting groove (32) and the ventilation screen (8).

9. The reverse circulation impactor of claim 8, wherein,

the buffer cushion (33) is obliquely arranged between the ventilation screen (8) and the shaft sleeve (3), and the inner diameter of the buffer cushion (33) is gradually increased along the direction from the joint (6) to the inner cylinder (2).

10. The reverse circulation impactor of claim 7, wherein,

the non-return valve assembly (9) further comprises:

a check valve (91) sleeved on the outer side of the collecting pipe (5), wherein a molding surface is arranged on the check valve (91), and the molding surface is matched with the inner surface of the joint (6) and used for opening and closing the air cavity;

an elastic piece (92) fixedly connected with the check valve (91), wherein one end of the elastic piece (92) far away from the check valve (91) is abutted with the vent screen (8);

the vent screen (8) is provided with a guide piece (93), and the guide piece (93) is used for limiting and restraining the deformation direction of the elastic piece (92).

11. The reverse circulation impactor of claim 7, wherein,

the connecting tube assembly (7) comprises:

the body (71) is sleeved outside the collecting pipe (5), and an annular mounting groove is formed in the outer circumferential surface of the body (71);

The locating sleeve (72) is sleeved on the outer side of the annular mounting groove, the locating sleeve (72) comprises locating pieces (721) and rubber rings (722), the locating pieces (721) are at least two, the locating pieces (721) are folded to form an assembly hole (723) and an annular groove (724), the assembly hole (723) is matched with the annular mounting groove, and the rubber rings (722) are arranged in the annular groove (724) and used for fixing the locating pieces (721) in the annular mounting groove.