Hydraulic drive percussion drilling tool for coal mine hard rock drilling

Abstract

The utility model relates to the technical field of drilling tools, in particular to a coal mine hard rock drilling hydraulic drive percussion drilling tool which comprises a spline housing and a percussion drill bit, the spline housing comprises a front-end casing pipe and a rear-end casing pipe, and the percussion drill bit comprises an alloy end, a reinforcing end cover and a center long pipe. And the spline housing and the percussion bit are assembled and connected through a reinforced limiting cover. The front-end casing pipe and the rear-end casing pipe are used for forming the spline housing, the alloy end head, the reinforcing end cover and the central long pipe are used for forming the percussion bit, and the internal threads and the external threads which are matched with each other are respectively engraved on the counter bore groove and the reinforcing rib end, so that the preliminary sleeving of the percussion bit and the spline housing is realized; the spline housing is sleeved with a reinforcing limiting cover, the reinforcing limiting cover is integrally connected with a long bolt which is arranged in the spline housing in a sleeved mode through an impact drill bit, the reinforcing limiting cover is fixed to the spline housing, and therefore the connection stability between the impact end and the spline housing is further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling tools, in particular to a water pressure driven impact drilling tool for hard rock drilling in coal mines. Background Art

[0002] Impact drills work by rotation and impact. A single impact is very slight, and multiple impact frequencies can produce continuous force and can be used for natural stone or concrete.

[0003] Existing hydraulically driven impact drill tools for hard rock drilling in coal mines, such as the one disclosed in announcement number CN213869698U, adopt a semi-enclosed structure of a spline sleeve for the installation of the impact drill bit, and only a threaded connection method is adopted between the two. However, the impact drill bit needs to withstand a huge external force during operation, so it is not only easy for the connection with the spline sleeve to loosen, but it is also more likely for the impact drill bit to contact a large area of ​​hard rock due to lack of structural protection. Similarly, the impact drill bit may be deformed due to stress or even structural damage due to excessive exposure, which seriously affects the normal use of the impact drill tool. Utility Model Content

[0004] The utility model aims to solve the problem that the impact drill tool in the prior art is thin in structure and lacks structural protection, and proposes a water pressure driven impact drill tool for hard rock drilling in coal mines.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A water pressure driven impact drill for hard rock drilling in coal mines comprises a spline sleeve and an impact drill bit, wherein the spline sleeve comprises a front casing and a rear casing, and the impact drill bit comprises an alloy end, a reinforced end cover and a central long tube, and the spline sleeve and the impact drill bit are assembled and connected via a reinforced limit cover.

[0007] Preferably, the front end sleeve and the rear end sleeve are concentrically arranged, and both the front end sleeve and the rear end sleeve are tube structures with two ends communicating with each other.

[0008] Preferably, the alloy end head, the reinforced end cover and the central long tube are connected in sequence, and an open long hole is opened in the alloy end head and connected to the central long tube through the reinforced end cover.

[0009] Preferably, the front end sleeve is provided with a countersunk groove for fitting the reinforced end cover, and the countersunk groove and the reinforced end cover are respectively engraved with matching internal threads and external threads, the front end sleeve is provided with a long receiving cavity, and a reinforcing rib corresponding to the long receiving cavity is integrally connected to the alloy end head, the reinforced limiting cover is provided with a slot corresponding to the reinforcing rib, and a long bolt that movably passes through the reinforcing rib and corresponds to the long receiving cavity is welded in the slot, the front end sleeve and the reinforced limiting cover are respectively provided with corresponding inner holes and outer holes, and locking screws are installed in the inner holes and the outer holes.

[0010] Preferably, the long receiving cavity, the reinforcing rib, the slot and the long bolt are distributed equidistantly in the circumferential direction in a one-to-one correspondence.

[0011] Preferably, the inner holes, the outer holes and the locking screws are distributed equidistantly in the circumferential direction in a one-to-one correspondence.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The utility model utilizes the front end sleeve and the rear end sleeve to form a spline sleeve, utilizes the alloy end head, the reinforced end cover and the central long tube to form an impact drill bit, and realizes the preliminary set of the impact drill bit and the spline sleeve by respectively engraving matching internal threads and external threads on the countersunk groove and the reinforcing rib end.

[0014] 2. The utility model sets a reinforcing limit cover on the spline sleeve, integrally connects a long bolt which is set in the spline sleeve through the impact drill bit to the reinforcing limit cover, and fixes the reinforcing limit cover on the spline sleeve to further enhance the connection stability between the impact end and the spline sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a water pressure driven impact drill for hard rock drilling in coal mines proposed by the utility model;

[0016] Figure 2 This is a schematic diagram of an explosion of a water pressure driven impact drill for hard rock drilling in coal mines proposed by the utility model;

[0017] Figure 3 The utility model is a cross-sectional view of a water pressure driven impact drill for hard rock drilling in coal mines.

[0018] In the figure: 1. spline sleeve; 101. front end sleeve; 102. rear end sleeve; 2. impact drill bit; 201. alloy end; 202. reinforced end cover; 203. center long tube; 3. reinforced limit cover; 4. countersunk groove; 5. internal thread; 6. external thread; 7. storage long cavity; 8. reinforcing rib; 9. slot; 10. long bolt; 11. internal hole; 12. external hole; 13. locking screw. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Reference Figure 1-Figure 3 , a hydraulically driven impact drill for hard rock drilling in coal mines, comprising a spline sleeve 1 and an impact drill bit 2, as shown in the attached manual. Figure 1 The spline sleeve 1 includes a front sleeve 101 and a rear sleeve 102, and the impact drill bit 2 includes an alloy end 201, a reinforced end cover 202 and a central long tube 203. The central long tube 203 is sleeved in the front sleeve 101 and the rear sleeve 102 of the spline sleeve 1 to achieve the sleeve of the impact drill bit 2 in the spline sleeve 1.

[0021] The spline sleeve 1 and the impact drill bit 2 are assembled and connected by a reinforced limit cover 3. It is worth noting that a countersunk groove 4 for fitting the reinforced end cover 202 is provided in the front end sleeve 101, and the countersunk groove 4 and the reinforced end cover 202 are respectively engraved with matching internal threads 5 and external threads 6. The internal threads 5 and the external threads 6 are threadedly connected by screwing the impact drill bit 2. A long receiving cavity 7 is provided in the front end sleeve 101, and a reinforcing rib 8 corresponding to the long receiving cavity 7 is integrally connected to the alloy end 201. A slot 9 corresponding to the reinforcing rib 8 is provided in the position limit cover 3, and a long bolt 10 is welded in the slot 9, which is movable and passes through the reinforcing rib 8 and corresponds to the long cavity 7. By passing the long bolt 10 through the reinforcing rib 8 and sleeved in the reinforced position limit cover 3, corresponding inner holes 11 and outer holes 12 are respectively provided in the front end sleeve 101 and the reinforced position limit cover 3, and locking screws 13 are installed in the inner holes 11 and the outer holes 12. By sleeved the reinforced position limit cover 3 on the spline sleeve 1, the locking connection between the two is strengthened by using the locking screws 13.

[0022] The front sleeve 101 and the rear sleeve 102 are concentrically arranged, and both the front sleeve 101 and the rear sleeve 102 are tube structures with interconnected ends, which is convenient for fitting the reinforced end cover 202 and the central long tube 203 in the impact drill bit 2 through the spline sleeve 1.

[0023] The alloy end head 201 , the reinforced end cover 202 and the central long tube 203 are connected in sequence, and an open long hole is opened in the alloy end head 201 to connect to the central long tube 203 through the reinforced end cover 202 , so as to realize the hollow structure of the impact drill bit 2 .

[0024] Please refer to the instruction manual for details Figure 1 The long cavity 7, the reinforcing rib 8, the slot 9 and the long bolt 10 are circumferentially distributed in a one-to-one correspondence, and the long bolt 10 is used to strengthen the connection between the impact drill bit 2 and the spline sleeve 1.

[0025] The inner holes 11 , the outer holes 12 and the locking screws 13 are equidistantly distributed in the circumferential direction in a one-to-one correspondence, so as to further strengthen the assembly connection between the limit cover 3 and the spline sleeve 1 .

[0026] The functional principle of the utility model can be explained through the following operation modes:

[0027] The central long tube 203 is sleeved into the spline sleeve 1 by screwing the alloy end 201, and is sleeved into the counterbore groove 4 through the internal thread 5 and the external thread 6;

[0028] The reinforcing limit cover 3 is pressed tightly against the impact drill bit 2, so that the long bolt 10 extends into the receiving long cavity 7 through the reinforcing rib 8, and at this time, the inner hole 11 corresponds to the outer hole 12 inside and outside;

[0029] The locking screws 13 are tightened in the inner hole 11 and the outer hole 12 to achieve a fixed connection between the reinforcing limit cover 3 and the spline sleeve 1 .

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulically driven impact drill for hard rock drilling in coal mines, comprising a spline sleeve (1) and an impact drill bit (2), characterized in that: The spline sleeve (1) comprises a front sleeve (101) and a rear sleeve (102); the impact drill bit (2) comprises an alloy end head (201), a reinforced end cover (202) and a central long tube (203); the spline sleeve (1) and the impact drill bit (2) are assembled and connected via a reinforced limiting cover (3).

2. A water pressure driven impact drill for hard rock drilling in coal mines according to claim 1, characterized in that: The front end sleeve (101) and the rear end sleeve (102) are arranged concentrically, and both the front end sleeve (101) and the rear end sleeve (102) are tube structures with two ends communicating with each other.

3. A water pressure driven impact drill for hard rock drilling in coal mines according to claim 1, characterized in that: The alloy end head (201), the reinforced end cover (202) and the central long tube (203) are connected in sequence, and an open long hole is provided in the alloy end head (201) and is connected to the central long tube (203) through the reinforced end cover (202).

4. A water pressure driven impact drill for hard rock drilling in coal mines according to claim 1, characterized in that: The front end sleeve (101) is provided with a countersunk groove (4) for fitting the reinforcing end cover (202), and the countersunk groove (4) and the reinforcing end cover (202) are respectively engraved with matching internal threads (5) and external threads (6), the front end sleeve (101) is provided with a receiving long cavity (7), and a reinforcing rib (8) corresponding to the receiving long cavity (7) is integrally connected to the alloy end head (201), the reinforcing limit cover (3) is provided with a slot (9) corresponding to the reinforcing rib (8), and a long bolt (10) is welded in the slot (9) and movably penetrates the reinforcing rib (8) and corresponds to the receiving long cavity (7), the front end sleeve (101) and the reinforcing limit cover (3) are respectively provided with corresponding internal holes (11) and external holes (12), and locking screws (13) are installed in the internal holes (11) and the external holes (12).

5. A water pressure driven impact drill for hard rock drilling in coal mines according to claim 4, characterized in that: The long storage cavity (7), the reinforcing rib (8), the clamping groove (9) and the long bolt (10) are distributed equidistantly in the circumferential direction in a one-to-one correspondence.

6. A water pressure driven impact drill for hard rock drilling in coal mines according to claim 4, characterized in that: The inner holes (11), the outer holes (12) and the locking screws (13) are distributed equidistantly in the circumferential direction in a one-to-one correspondence.

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