Hammer head of square down-the-hole hammer

Abstract

The utility model relates to the technical field of down-the-hole hammers, in particular to a square down-the-hole hammer head which comprises a hammer head body. The hammer head is square, hollow in the middle and provided with a limiting hole and a connecting hole from top to bottom for mounting the hammer handle, and the inner diameter of the limiting hole is larger than that of the connecting hole; the hammer handle comprises a second connecting part, the second connecting part is matched with the connecting hole, a limiting part is arranged above the second connecting part, and the limiting part is matched with the limiting hole; a first connecting part is arranged above the limiting part, the outer side of the first connecting part is sleeved with an annular pressing plate, the pressing plate is pressed above the boundary line of the limiting part and the hammer head, a gap is reserved between the inner side and the first connecting part, and the outer side is fixed to the upper surface of the hammer head; a vertically-through main body channel is formed in the middle of the hammer handle and comprises an air flow channel and a plurality of flow dividing channels which are communicated with the lower end of the air flow channel and obliquely arranged outwards. The mode that the hammer handle is fixed through the pressing plate is relatively simple, the process cost is low, and operation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of down-the-hole hammers, in particular to a square down-the-hole hammer head. Background Art

[0002] Hammers are widely used in drilling and reaming operations. Currently, down-the-hole hammers use a drilling rig to perform rotary motion to achieve drilling. The holes formed by drilling are all circular holes. In the field of engineering construction, square pile construction is often encountered during continuous wall construction or other foundation construction.

[0003] At the current stage, square pile construction generally adopts a special square drill bit with picks, which relies on the alloy on the picks to crush the rock layer. For example, the utility model patent CN202223257556.8 applied for on December 5, 2022 proposed a square slot impactor, which includes a square cylinder, an air inlet joint, a first fixed plate, a second fixed plate, a sealing plate and multiple sub-down-the-hole hammers; the impactor of this application inputs compressed gas from the air inlet joint into the air inlet chamber, and then flows from the air inlet chamber into each sub-down-the-hole hammer, which is conducive to the impact drilling of each down-the-hole hammer together; the multiple sub-down-the-hole hammers are evenly distributed in the outline of the square cylinder in the form of horizontal and vertical rows, which is conducive to the sub-down-the-hole hammers impacting and drilling together to form square slots, thereby realizing square slot drilling; the slag crushed by the sub-down-the-hole hammers is discharged through the slag discharge hole of the first fixed plate and the slag discharge pipeline in the square cylinder. When this type of drill bit encounters hard rock, the footage is very slow. The construction cost of this type of drill bit is high, the project construction period is long, the hole quality is poor, the hammer handle is not easy to install, and the limit component structure is complex. Utility Model Content

[0004] The purpose of the utility model is to provide a square down-the-hole hammer head, which solves the problem of square piles entering the rock, realizes flexible operation in complex geological conditions, and has a large effective diffusion area of ​​the channel, thereby significantly improving the operating efficiency of the down-the-hole hammer.

[0005] The purpose of the utility model is achieved by providing a square down-the-hole hammer head, comprising a hammer head;

[0006] The hammer head is square with a hollow center. From top to bottom, a limiting hole and a connecting hole are provided for mounting the hammer handle. The inner diameter of the limiting hole is larger than that of the connecting hole.

[0007] The hammer handle includes a second connecting portion, the second connecting portion is matched with the connecting hole, and a limiting portion is provided above the second connecting portion, the limiting portion is matched with the limiting hole;

[0008] A first connecting portion is provided above the limiting portion, and an annular pressing plate is sleeved on the outer side of the first connecting portion. The pressing plate is pressed above the intersection line between the limiting portion and the hammer head, with a gap between the inner side and the first connecting portion and the outer side being fixed to the upper surface of the hammer head;

[0009] A main channel is provided in the middle of the hammer handle, which passes through from top to bottom. The main channel includes an air flow channel and a plurality of diversion channels connected to the lower end thereof and arranged obliquely outwards.

[0010] The bottom edge of the hammer head is provided with alloy teeth.

[0011] Preferably, the shape of the hammer head can be designed to be square or rectangular, and the lower part is designed to be inlaid with arrays of cemented carbide around the four sides, so as to utilize the high wear resistance of cemented carbide to crush the rock layer.

[0012] The lower end of the air flow channel is in an arc shape with an opening facing upwards and is communicated with a plurality of diversion channels.

[0013] The diversion channels are evenly distributed around the axis of the air flow channel, and a plurality of diversion channels diffuse outward from the axis of the second connecting portion.

[0014] The bottom of the air flow channel is located inside the second connecting portion, and the vertical height of the diversion channel is not less than 0.6 times the height of the second connecting portion.

[0015] The included angle between the axis of the diversion channel and the axis of the air flow channel is less than 40° and greater than 10°.

[0016] Furthermore, the maximum outer dimension of the diversion channel on the bottom surface of the second connecting portion is not greater than 3 / 4 of the diameter of the bottom surface of the second connecting portion and not less than 1 / 2 of the diameter of the bottom surface of the second connecting portion.

[0017] The outer diameter of the pressure plate is smaller than the length and width of the upper portion of the hammer head.

[0018] The width of the ring where the pressure plate contacts the upper surface of the hammer head accounts for 1 / 2-7 / 10 of the width of the pressure plate ring.

[0019] Preferably, the connection between the pressure plate and the upper surface of the hammer head can be achieved by welding or bolting.

[0020] The part of the hammer handle above the pressure plate is also provided with splines on the outside. The part of the hammer handle above the pressure plate is also provided with splines on the outside.

[0021] Furthermore, the spline can be manufactured according to the requirements of the shank of the down-the-hole impactor to be used.

[0022] As described above, the square head down-the-hole hammer of the present invention has the following beneficial effects:

[0023] The square hammer head down-the-hole hammer of the utility model has a simple structure and a long service life. It is suitable for the situation where square piles are driven into the rock. The way in which the pressure plate fixes the hammer handle is relatively simple and the process cost is low. When in use, the hammer handle can rotate relatively inside the hammer head, and the airflow output from the channel can act on a large area, with a high airflow utilization rate. It is used to crush ore and rock and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the attached figure:

[0025] Figure 1 This is an overall cross-sectional view of a square down-the-hole hammer head of the utility model;

[0026] Figure 2 This is a bottom view of the hammer head of a square down-the-hole hammer according to the present invention.

[0027] The components represented by the reference numerals in the figure are:

[0028] 1. Hammer handle; 101. First connecting part; 102. Limiting part; 103. Second connecting part; 2. Hammer head; 201. Limiting hole; 202. Connecting hole; 3. Pressing plate; 4. Main body channel; 401. Air flow channel; 402. Diverter channel; 5. Alloy teeth; 6. Spline. DETAILED DESCRIPTION

[0029] The purpose of the utility model is achieved in this way: a square down-the-hole hammer head, comprising a hammer head 2;

[0030] Reference Figure 1 The hammer head 2 is square, with a hollow center, and a limiting hole 201 and a connecting hole 202 are provided from top to bottom for mounting the hammer handle 1. The inner diameter of the limiting hole 201 is larger than the inner diameter of the connecting hole 202.

[0031] The hammer handle 1 includes a second connecting portion 103, which is matched with the connecting hole 202. A limiting portion 102 is provided above the second connecting portion 103, which is matched with the limiting hole 201.

[0032] A first connecting portion 101 is provided above the limiting portion 102. An annular pressure plate 3 is sleeved on the outside of the first connecting portion 101. The pressure plate 3 is pressed above the intersection line between the limiting portion 102 and the hammer head 2. A gap is left between the inner side and the first connecting portion 101, and the outer side is fixed to the upper surface of the hammer head 2.

[0033] A main channel 4 is provided in the middle of the hammer handle 1 and passes through from top to bottom. The main channel 4 includes an air flow channel 401 and a plurality of diversion channels 402 connected to the lower end thereof and arranged obliquely outward.

[0034] The bottom edge of the hammer head 2 is provided with alloy teeth 5, such as Figure 2 shown.

[0035] Preferably, the shape of the hammer head 2 can be designed to be square or rectangular, and the lower part is designed to be inlaid with a plurality of groups of alloy teeth 5 around the four sides, and the high wear resistance of the alloy teeth 5 is utilized to crush the rock layer.

[0036] The working condition of this down-the-hole hammer operation is to drill a hole with a certain foundation, so there is no need to design alloy teeth 5 on the entire lower part, and the alloy teeth 5 can cooperate with the main channel 4 to crush the rock layer.

[0037] The design of the middle part of the hammer head 2 reduces the overall weight while maintaining sufficient structural strength. The arrangement of the alloy teeth 5 enhances the wear resistance and penetration of the bottom surface of the hammer head 2, thereby extending its service life.

[0038] The hammer handle 1 and the hammer head 2 are clearance-fitted, ensuring that the hammer handle 1 can rotate inside the hammer head 2 under the power provided by the down-the-hole hammer impactor.

[0039] The lower end of the air flow channel 401 is in an arc shape with an opening facing upward, and is connected to a plurality of diversion channels 402 .

[0040] The arc-shaped connection between the airflow channel 401 and the diversion channel 402 can optimize the airflow path, smooth the transition of the airflow, and concentrate the airflow. Under the same gas flow rate, the airflow pressure loss is smaller, the airflow resistance is reduced, and efficient transmission is achieved.

[0041] The diversion channels 402 are evenly distributed around the axis of the air flow channel 401 , and a plurality of diversion channels 402 spread outward from the axis of the second connecting portion 103 .

[0042] The diversion channels 402 are evenly distributed, so that the impact force of the airflow passing through can be more uniform, thereby improving the efficiency of the operation.

[0043] The bottom of the air flow channel 401 is located inside the second connecting portion 103 , and the vertical height of the diversion channel 402 is not less than 0.6 times the height of the second connecting portion 103 .

[0044] If the diversion channel 402 is too long, the gas impact force will be insufficient and excessive energy will be wasted. If the diversion channel 402 is too short, the diffusion range of the gas will be too small.

[0045] The included angle between the axis of the diversion channel 402 and the axis of the air flow channel 401 is less than 40° and greater than 10°.

[0046] Furthermore, the maximum outer dimension of the diversion channel 402 on the bottom surface of the second connecting portion 103 is not greater than ¾ of the diameter of the bottom surface of the second connecting portion 103 and not less than ½ of the diameter of the bottom surface of the second connecting portion 103 .

[0047] If the inclination angle of the diversion channel 402 is too large or the maximum outer dimension is too close to the outer contour edge of the second connection part 103, the second connection part 103 will be insufficiently strong and prone to cracking. If the inclination angle is too small or the maximum outer dimension is too close to the axis of the second connection part 103, the diffusion area of ​​the airflow will be insufficient.

[0048] The outer diameter of the pressing plate 3 is smaller than the length and width of the upper portion of the hammer head 2 .

[0049] The width of the ring where the pressing plate 3 contacts the upper surface of the hammer head 2 accounts for 1 / 2-7 / 10 of the width of the pressing plate 3.

[0050] Preferably, the connection between the pressing plate 3 and the upper surface of the hammer head 2 can be welding or bolting.

[0051] The design of the annular pressure plate 3 not only limits the relative position of the hammer handle 1 and the hammer head 2, but also avoids excessive stress concentration through the gap setting, thereby improving the stability and safety of the overall structure.

[0052] While saving materials for making the pressing plate 3, the position of the hammer handle 1 in the hammer head 2 is effectively limited. Such force distribution can balance the functions of limiting and firmly connecting, and maximize the role of the pressing plate 3.

[0053] The portion of the hammer handle 1 above the pressing plate 3 is further provided with a spline 6 on the outside. The portion of the hammer handle 1 above the pressing plate 3 is further provided with a spline 6 on the outside.

[0054] Furthermore, the spline 6 can be manufactured according to the requirements of the shank of the down-the-hole impactor to be used.

Claims

1. A square down-the-hole hammer head, characterized in that: including a hammer head (2); The hammer head (2) is square, with a hollow center, and is provided with a limiting hole (201) and a connecting hole (202) from top to bottom for mounting the hammer handle (1), wherein the inner diameter of the limiting hole (201) is larger than the inner diameter of the connecting hole (202); The hammer handle (1) includes a second connecting portion (103), the second connecting portion (103) cooperates with the connecting hole (202), a limiting portion (102) is provided above the second connecting portion (103), and the limiting portion (102) cooperates with the limiting hole (201); A first connecting portion (101) is provided above the limiting portion (102), and an annular pressing plate (3) is sleeved on the outside of the first connecting portion (101). The pressing plate (3) is pressed above the boundary line between the limiting portion (102) and the hammer head (2), with a gap between the inner side and the first connecting portion (101), and the outer side is fixed to the upper surface of the hammer head (2); A main channel (4) is provided in the middle of the hammer handle (1) and is connected vertically. The main channel (4) includes an air flow channel (401) and a plurality of diversion channels (402) connected at its lower end and arranged obliquely outward.

2. A square down-the-hole hammer head according to claim 1, characterized in that: The bottom edge of the hammer head (2) is provided with alloy teeth (5).

3. The square down-the-hole hammer head according to claim 1, characterized in that: The outer diameter of the pressing plate (3) is smaller than the length and width of the upper portion of the hammer head (2).

4. A square down-the-hole hammer head according to claim 1, characterized in that: The lower end of the air flow channel (401) is in an arc shape with an opening facing upward, and is connected to a plurality of diversion channels (402).

5. A square down-the-hole hammer head according to claim 4, characterized in that: The diversion channels (402) are evenly distributed around the axis of the airflow channel (401).

6. A square down-the-hole hammer head according to claim 1, characterized in that: The bottom of the airflow channel (401) is located inside the second connecting portion (103), and the vertical height of the diversion channel (402) is not less than 0.6 times the height of the second connecting portion (103).

7. A square down-the-hole hammer head according to claim 6, characterized in that: The included angle between the axis of the diversion channel (402) and the axis of the airflow channel (401) is less than 40° and greater than 10°.

8. The square down-the-hole hammer head according to claim 6, characterized in that: The maximum outer dimension of the diversion channel (402) on the bottom surface of the second connecting portion (103) is no greater than 3 / 4 of the diameter of the bottom surface of the second connecting portion (103) and no less than 1 / 2 of the diameter of the bottom surface of the second connecting portion (103).

9. The square down-the-hole hammer head according to claim 1, characterized in that: The width of the ring where the pressing plate (3) contacts the upper surface of the hammer head (2) accounts for 1 / 2-7 / 10 of the width of the ring of the pressing plate (3).

10. The square down-the-hole hammer head according to claim 1, characterized in that: The portion of the hammer handle (1) above the pressure plate (3) is also provided with a spline (6) on the outside.

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