Novel double-cylinder down-hole hammer
By adopting a design in the down-the-hole impactor where the diameters of the piston, outer sleeve, and inner cylinder are equal, the problem of return resistance in existing technologies is solved, achieving higher energy utilization and working efficiency.
Patent Information
- Application Number
- CN202520060948.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-01-10
AI Technical Summary
Traditional double-cylinder down-the-hole impactors suffer from high return resistance due to the diameter difference between the piston, outer sleeve, and inner cylinder mating section, which reduces energy utilization and working efficiency.
The piston, outer sleeve, and inner cylinder are designed with equal diameters at their mating positions, which ensures that there is no resistance when the piston starts its return stroke, thereby increasing the initial thrust and return acceleration.
This improves energy utilization and piston return efficiency, indirectly enhancing the impactor's working efficiency.
Smart Images
Figure CN223634621U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to rock drilling equipment field, concretely to a novel double cylinder down-the-hole hammer. BACKGROUND
[0002] Down-the-hole hammer is the most widely used rock drilling tool in rock drilling construction, which uses compressed air or mixed medium of compressed air and water as power, high-pressure compressed air as power source and alternately impacts front air chamber and rear air chamber inside the hammer to produce thrust to drive impact piston reciprocating, thereby converting internal energy of compressed air into mechanical energy to realize high-frequency impact of the piston to the drill bit, and in turn achieve the drill bit to work on rock formation to complete rock breaking action. Figures 1-2 The working performance of the hammer is directly related to the structural parameters of the internal gas distribution mechanism, and the traditional down-the-hole hammer is divided into single-cylinder type and double-cylinder type, wherein the main components of the gas distribution mechanism of the double-cylinder hammer include piston, outer sleeve and inner cylinder. The outer diameter A of the cooperation segment 1a is greater than that of the cooperation segment 1b, in the initial state, high-pressure gas P enters the front air chamber 4 to drive the piston to start return motion, and the difference in outer diameter between the cooperation segment 1a and the cooperation segment 1b on the piston leads to return resistance of the piston, thereby greatly reducing energy utilization and working efficiency of the hammer. The utility model discloses the technical problems to be solved are as follows: a novel double cylinder down-the-hole hammer, which is characterized by the following technical scheme.
[0003] The utility model discloses the technical problems to be solved are as follows: a novel double cylinder down-the-hole hammer, which is characterized by the following technical scheme. The utility model discloses the technical problems to be solved are as follows: a novel double cylinder down-the-hole hammer, which is characterized by the following technical scheme.
[0004] In order to realize the above technical features, the utility model is realized as follows: a novel double cylinder down-the-hole hammer, which comprises a hammer body, the hammer body comprises a piston, an outer sleeve and an inner cylinder, the piston is provided with a first cooperation segment in sliding cooperation with the outer sleeve, and the piston is provided with a second cooperation segment in sliding cooperation with the inner cylinder, and the diameters of the first cooperation segment and the second cooperation segment are equal.
[0005] The impactor body further comprises a front joint, a gas distribution rod and a guide sleeve, the piston is provided with a third matching section close to the impact end and in sliding fit with the guide sleeve, the front gas chamber in the initial state of the impactor is enclosed by the guide sleeve, the piston and the outer sleeve, in operation, high-pressure gas is introduced from the central gas hole of the rear joint to the gas passage formed by the outer wall of the inner cylinder and the inner wall of the outer sleeve, and flows to the front gas chamber from the outer surface of the piston, and the piston starts return movement under the action of the compressed gas.
[0006] The impactor body further comprises a front joint and a gas distribution rod, the piston is provided with a cavity close to the impact end and in sliding fit with the drill bit tail pipe, the front gas chamber in the initial state of the impactor is enclosed by the piston, the outer sleeve and the snap ring, in operation, high-pressure gas is introduced from the central gas hole of the rear joint to the gas passage formed by the outer wall of the inner cylinder and the inner wall of the outer sleeve, and flows to the front gas chamber from the outer surface of the piston, and the piston starts return movement under the action of the compressed gas.
[0007] The utility model has the following beneficial effects:
[0008] The utility model discloses an impactor, which adopts the structure of equal diameters for the position where the piston cooperates with the outer sleeve and the inner cylinder, so that the piston is in a non-resistance state when starting return movement, has greater initial thrust compared with the traditional impactor, improves the energy utilization rate, obtains greater return acceleration, and is more beneficial to the return movement of the piston, and indirectly improves the working efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0009] The utility model will be further described below in combination with the drawings and examples.
[0010] Figure 1 It is the structure diagram of the first double-cylinder type down-the-hole impactor.
[0011] Figure 2 It is the structure diagram of the second double-cylinder type down-the-hole impactor.
[0012] Figure 3 It is the structure diagram of the utility model embodiment 2.
[0013] Figure 4 It is the structure diagram of the utility model embodiment 3.
[0014] In the drawing: piston 1, outer sleeve 2, inner cylinder 3, front gas chamber 4, rear joint 5, gas distribution rod 6, guide sleeve 7, snap ring 8, front joint 9, drill bit 10, drill bit tail pipe 11, gas passage 12.
[0015] First matching section 1a, second matching section 1b, third matching section 1c, cavity 1d. DETAILED DESCRIPTION
[0016] The embodiment of the utility model will be further described below in combination with the drawings.
[0017] Embodiment 1:
[0018] Referring to Figures 3-4 A new double-cylinder down-the-hole hammer comprises a hammer body, the hammer body comprising a piston 1, an outer sleeve 2 and an inner cylinder 3, the piston 1 being provided with a first matching section 1a in sliding cooperation with the outer sleeve 2, the piston 1 being provided with a second matching section 1b in sliding cooperation with the inner cylinder 3, and the first matching section 1a and the second matching section 1b having equal diameters. The equal-diameter structure of the positions where the piston cooperates with the outer sleeve and the inner cylinder makes the piston start returning in a state of no resistance, has greater initial thrust compared with a conventional hammer, improves the energy utilization rate, obtains greater returning acceleration, and is more beneficial to the returning action of the piston, thereby indirectly improving the working efficiency.
[0019] Embodiment 2:
[0020] Referring to Figure 3 The hammer body further comprises a front joint 9, a gas distribution rod 6 and a guide sleeve 7, the piston 1 is provided with a third matching section 1c in sliding cooperation with the guide sleeve 7 near the impact end, the front gas chamber 4 in the initial state of the hammer is enclosed by the guide sleeve 7, the piston 1 and the outer sleeve 2, in working, high-pressure gas is introduced from the central gas hole of the rear joint 5 to the gas passage 12 formed by the outer wall of the inner cylinder 3 and the inner wall of the outer sleeve 2, and then flows to the front gas chamber 4 on the outer surface of the piston 1, and the piston 1 starts returning under the action of the compressed gas. The equal-diameter design of the first matching section 1a and the second matching section 1b makes the piston start returning in a state of no resistance, has greater initial thrust compared with a conventional hammer, improves the energy utilization rate, obtains greater returning acceleration, and is more beneficial to the returning action of the piston, thereby indirectly improving the working efficiency.
[0021] Embodiment 3:
[0022] Referring to Figure 4 The hammer body further comprises a front joint 9 and a gas distribution rod 6; the piston 1 is provided with a cavity 1d in sliding cooperation with the drill bit tail pipe 11 near the impact end, the front gas chamber 4 in the initial state of the hammer is enclosed by the piston 1, the outer sleeve 2 and the snap ring 8, in working, high-pressure gas is introduced from the central gas hole of the rear joint 5 to the gas passage 12 formed by the outer wall of the inner cylinder 3 and the inner wall of the outer sleeve 2, and then flows to the front gas chamber 4 on the outer surface of the piston 1, and the piston 1 starts returning under the action of the compressed gas. The equal-diameter design of the first matching section 1a and the second matching section 1b makes the piston start returning in a state of no resistance, has greater initial thrust compared with a conventional hammer, improves the energy utilization rate, obtains greater returning acceleration, and is more beneficial to the returning action of the piston, thereby indirectly improving the working efficiency.
Claims
1. A new type of dual cylinder down-the-hole hammer comprising a hammer body, the hammer body comprising a piston (1), an outer sleeve (2) and an inner cylinder (3), characterized in that: The piston (1) is provided with a first matching section (1a) which is in sliding fit with the outer sleeve (2), and the piston (1) is provided with a second matching section (1b) which is in sliding fit with the inner cylinder (3), and the diameters of the first matching section (1a) and the second matching section (1b) are equal.
2. A new type of double cylinder down-the-hole hammer according to claim 1, characterized in that: The impactor body further comprises a front joint (9), a gas distribution rod (6) and a guide sleeve (7), the piston (1) is provided with a third matching section (1c) which is in sliding fit with the guide sleeve (7) near the impact end, the front gas chamber (4) in the initial state of the impactor is enclosed by the guide sleeve (7), the piston (1) and the outer sleeve (2), in working, high-pressure gas is introduced from the center gas hole of the rear joint (5) to the gas passage (12) formed by the outer wall of the inner cylinder (3) and the inner wall of the outer sleeve (2), and then flows to the front gas chamber (4) through the outer surface of the piston (1), and the piston (1) starts to move back under the action of the compressed gas.
3. The new type of double-cylinder down-the-hole hammer according to claim 1, characterized in that: The impactor body further comprises a front joint (9) and a gas distribution rod (6); the piston (1) is provided with a cavity (1d) which is in sliding fit with the drill bit tail pipe (11) near the impact end, the front gas chamber (4) in the initial state of the impactor is enclosed by the piston (1), the outer sleeve (2) and the snap ring (8), in working, high-pressure gas is introduced from the center gas hole of the rear joint (5) to the gas passage (12) formed by the outer wall of the inner cylinder (3) and the inner wall of the outer sleeve (2), and then flows to the front gas chamber (4) through the outer surface of the piston (1), and the piston (1) starts to move back under the action of the compressed gas.