Annular hydraulic buffer

Abstract

The invention provides an annular hydraulic buffer, and belongs to the technical field of impactors, the annular hydraulic buffer comprises a buffer cylinder and a plurality of buffer structures, and each buffer structure comprises a buffer cylinder and a buffer rod; the buffer cylinder is provided with an upper cavity and a lower cavity; a first oil passing hole is formed in the upper cavity of the buffer cylinder, and a plurality of rows of second oil passing holes are formed in the lower cavity of the buffer cylinder; one end of the buffer rod is slidably arranged in the buffer cylinder, and the other end is located outside the buffer rod; a piston is arranged at the inner side end of the buffer rod; an elastic part is connected between the piston and the bottom of the buffer cylinder; the annular hydraulic buffer further comprises a collided ring, the collided ring and the buffer cylinder are coaxially arranged, and the collided ring is connected with the outer side end of each buffer rod. In the process that the piston slides to the bottom of the buffer cylinder, the piston can seal the second oil passing holes row by row; by means of the arrangement, oil in the elastic component and the lower cavity can provide resistance for sliding of the piston, then impact energy of the collided ring is consumed, and the situation that the collided ring is damaged is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of impactors, and in particular relates to an annular hydraulic buffer. Background Art

[0002] A down-the-hole impactor is an impact rock drilling tool, which includes a sleeve, a piston slidably arranged in the sleeve, and a drill bit arranged at one end of the impactor; one end of the drill bit is located in the sleeve, and the inner end of the drill bit is detachably provided with a retaining ring, and the sleeve and the drill bit portion have a retaining ring, and the position of the retaining ring remains unchanged; during rock drilling operations, the outer end of the drill bit contacts the rock, at which time the length of the drill bit in the sleeve is the longest, and the inner end of the drill bit is separated from the retaining ring; when the impactor is lifted, the drill bit slides outward, and at this time the retaining ring at the inner end of the drill bit contacts the retaining ring; to limit the lowest position of the drill bit.

[0003] During the rock drilling process, the impactor is always at the bottom of the hole; high-pressure gas is introduced into the impactor, which pushes the piston inside the impactor to reciprocate, causing the piston to reciprocate and hit the drill bit. The drill bit transfers the impact energy to the rock, thereby completing the rock drilling operation.

[0004] When the impactor is lifted or soft rock is encountered during drilling, the drill bit will slide outward, and the inner end of the drill bit will hit the retaining ring. Since the impact energy of the drill bit is large, the retaining ring bears all the impact energy of the drill bit, which can easily cause cracks or even breakage in the retaining ring. Summary of the invention

[0005] An embodiment of the present invention provides an annular hydraulic buffer, aiming to solve the problem in the prior art that a retaining ring is easily damaged when hit by a drill bit.

[0006] To achieve the above object, the technical solution adopted by the present invention is: Provided is an annular hydraulic buffer, comprising: The buffer cylinder is an annular structure, and a buffer cavity is provided inside the buffer cylinder; A plurality of buffer structures are arranged at intervals along the circumference of the buffer cylinder; each of the buffer structures comprises: The buffer cylinder has an upper cavity and a lower cavity; the buffer cylinder has a first oil-passing hole at the upper cavity position, and the buffer cylinder has a plurality of rows of second oil-passing holes at the lower cavity position; A buffer rod, one end of which is slidably arranged in the buffer cylinder, and the other end of which is located outside the buffer rod; the inner end of the buffer rod is provided with a piston, and an elastic component is connected between the piston and the bottom of the buffer cylinder; Among them, the annular hydraulic buffer also includes a collision ring coaxially arranged with the buffer cylinder, and the collision ring is connected to the outer end of each buffer rod; when the piston slides to the bottom of the buffer cylinder, the piston can close the second oil holes row by row.

[0007] In one possible implementation, a one-way conducting area is formed between the second oil holes in the lowest row and the bottom of the buffer cylinder. A one-way valve is provided at the buffer cylinder in the one-way conducting area. The conducting direction of the one-way valve is from the outside of the buffer cylinder to the inside of the buffer cylinder.

[0008] In a possible implementation, the elastic component includes a spring, one end of the spring is connected to the bottom of the buffer cylinder, and the other end of the spring is connected to the piston.

[0009] In a possible implementation, the buffer cavity is connected to one end of the buffer cylinder to form an opening; the buffer cylinder is detachably provided with a cover plate at the position of the open end, and the cover plate has a through hole for sliding fit of each buffer rod; Wherein, the piston is detachably connected to the buffer rod.

[0010] In a possible implementation, the bottom end of the buffer tube is fixed on the buffer cylinder, and the top end of the buffer tube is sealed with the cover plate; or, the bottom end of the buffer tube abuts against the buffer cylinder, and the top end of the buffer tube is sealed with the cover plate.

[0011] In a possible implementation, the inner end of the buffer rod has a threaded hole; the piston is sleeved on the inner end of the buffer rod, and the piston has a through hole aligned with the threaded hole on the buffer rod; the piston is fixed to the buffer rod by bolts.

[0012] In a possible implementation, an oil seal ring is provided between the cover plate and the top of the buffer cylinder, and the oil seal ring is in sealing cooperation with the buffer cavity; Wherein, the bottom end of the oil seal ring abuts against the buffer cylinder, and the top end of the oil seal ring abuts against the cover plate.

[0013] In a possible implementation, the cover plate has a protruding ring that is plugged into the buffer cavity, and the protruding ring abuts against the oil seal ring.

[0014] In a possible implementation, the impact ring has a plurality of threaded holes, the outer end of each buffer rod has an external thread, and the buffer rod is threadably matched with the corresponding threaded hole on the impact ring.

[0015] In a possible implementation manner, a diameter of the second oil hole is smaller than a diameter of the first oil hole.

[0016] The annular hydraulic buffer provided by the present invention, compared with the prior art, when the drill bit hits the impact ring, the impact ring, the buffer rod and the piston slide toward the bottom of the buffer cylinder, during the sliding process of the piston, the piston compresses the elastic component, and the piston squeezes the oil in the lower chamber from the second oil hole; during the sliding process of the piston toward the bottom of the buffer cylinder, the piston can close the second oil holes row by row, resulting in a decrease in the number of the second oil holes in the lower chamber, an increase in the resistance of the oil to the piston, and finally stopping the piston from sliding downward; through the above-mentioned arrangement, the elastic component and the oil in the lower chamber can both provide resistance to the sliding of the piston, thereby consuming the impact energy of the impact ring and reducing the damage to the impact ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of an annular hydraulic buffer provided in an embodiment of the present invention; Figure 2 A cross-sectional view of an annular hydraulic buffer provided by an embodiment of the present invention; Figure 3 for Figure 2 The enlarged schematic diagram of the middle A part; Figure 4 A schematic diagram of a collision ring portion of an annular hydraulic buffer provided in an embodiment of the present invention; Figure 5 for Figure 4 The enlarged schematic diagram of the middle part B; Figure 6 A cross-sectional view of a buffer cylinder portion of an annular hydraulic buffer provided in an embodiment of the present invention.

[0018] Explanation of the reference numerals: 1. Buffer cylinder; 11. Buffer chamber; 2. Buffer tube; 21. Upper chamber; 22. Lower chamber; 23. First oil hole; 24. Second oil hole; 25. One-way valve; 3. Buffer rod; 4. Piston; 5. Elastic component; 6. Impact ring; 7. Cover plate; 71. Protruding ring; 8. Oil seal ring. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Please also read Figures 1 to 6, now an annular hydraulic buffer provided by the present invention is described. The annular hydraulic buffer comprises a buffer cylinder 1 and a plurality of buffer structures. The buffer cylinder 1 is an annular structure, and the buffer cylinder 1 has a buffer cavity 11 inside. Each buffer structure comprises a buffer tube 2 and a buffer rod 3. The buffer tube 2 has an upper cavity 21 and a lower cavity 22. The buffer tube 2 has a first oil hole 23 at the position of the upper cavity 21, and the buffer tube 2 has a plurality of rows of second oil holes 24 at the position of the lower cavity 22. One end of the buffer rod 3 is slidably arranged in the buffer tube 2, and the other end is located outside the buffer rod 3. The inner end of the buffer rod 3 has a piston 4, and an elastic component 5 is connected between the piston 4 and the bottom of the buffer tube 2. The annular hydraulic buffer also comprises a collision ring 6 coaxially arranged with the buffer cylinder 1, and the collision ring 6 is connected to the outer end of each buffer rod 3. In the process of the piston 4 sliding to the bottom of the buffer tube 2, the piston 4 can close the second oil holes 24 row by row.

[0021] The annular hydraulic buffer provided by the present invention is compared with the prior art. When the drill bit hits the impact ring 6, the impact ring 6, the buffer rod 3 and the piston 4 slide toward the bottom of the buffer tube 2. During the sliding process of the piston 4, the piston 4 compresses the elastic component 5, and the piston 4 squeezes the oil in the lower chamber 22 out of the second oil hole 24; during the sliding process of the piston 4 toward the bottom of the buffer tube 2, the piston 4 can close the second oil holes 24 row by row, resulting in a decrease in the number of the second oil holes 24 in the lower chamber 22, an increase in the resistance of the oil to the piston 4, and finally the piston 4 stops sliding downward; through the above-mentioned arrangement, the elastic component 5 and the oil in the lower chamber 22 can both provide resistance to the sliding of the piston 4, thereby consuming the impact energy of the impact ring 6 and reducing the damage to the impact ring 6.

[0022] It should be noted that there is oil in both the buffer chamber 11 and the buffer cylinder 2. When the piston 4 squeezes the oil in the lower chamber 22 downward, the oil in the lower chamber 22 is discharged from the second oil hole 24 and enters the buffer chamber 11; the oil in the buffer chamber 11 can enter the upper chamber 21 of the buffer cylinder 2 from the first oil hole 23. When the piston 4 closes the second oil holes 24 row by row, the oil in the lower chamber 22 is difficult to squeeze out, so the resistance of the piston 4 to the oil gradually increases; through the above-mentioned setting, not only the impact energy of the impact ring 6 can be consumed, but also the situation where the piston 4 hits the bottom of the buffer cylinder 2 can be reduced.

[0023] In some embodiments, Figures 1 to 6 As shown, there is a one-way conduction area between the lowest row of second oil holes 24 and the bottom of the buffer cylinder 2. The buffer cylinder 2 is provided with a one-way valve 25 at the position of the one-way conduction area. The conduction direction of the one-way valve 25 is from the outside of the buffer cylinder 2 to the inside of the buffer cylinder 2.

[0024] It should be noted that, by arranging a one-way valve 25 on the buffer cylinder 2, when the piston 4 squeezes the oil in the lower chamber 22 downward, the one-way valve 25 is closed under the action of the pressure of the lower chamber 22, so that the oil in the lower chamber 22 will not be discharged from the one-way valve 25; when the piston 4 is reset upward under the elastic force of the elastic component 5, the piston 4 squeezes the oil in the upper chamber 21 of the buffer cylinder 2, causing the oil in the upper chamber 21 to be discharged from the first oil hole 23 into the buffer chamber 11, and the oil in the buffer chamber 11 can enter the lower chamber 22 from the one-way valve 25 and the second oil hole 24, so as to increase the reset speed.

[0025] In some embodiments, Figures 1 to 6 As shown, the elastic component 5 includes a spring, one end of the spring is connected to the bottom of the buffer cylinder 2, and the other end of the spring is connected to the piston 4.

[0026] Exemplarily, a spring is arranged in the buffer cylinder 2, and the spring can provide elastic force to the piston 4; when the piston 4 squeezes the oil in the lower chamber 22, the piston 4 also squeezes the spring, causing the spring to be compressed and deformed, and the spring elastic force increases; when resetting, the piston 4 moves upward under the action of the spring elastic force.

[0027] In some embodiments, Figures 1 to 6 As shown, the buffer chamber 11 is connected to one end of the buffer cylinder 1 to form an opening; the buffer cylinder 1 is detachably provided with a cover plate 7 at the position of the open end, and the cover plate 7 has a through hole for sliding fit of each buffer rod 3; wherein the piston 4 is detachably connected to the buffer rod 3.

[0028] It should be noted that by providing an opening at one end of the buffer cylinder 1 and covering the opening position of the buffer cylinder 1 with a cover plate 7, it can be easy to disassemble and assemble, and the oil in the buffer chamber 11 can be replaced regularly; the piston 4 is detachably connected to the buffer rod 3. When installing the buffer rod 3 and the cover plate 7, the inner end of the buffer rod 3 is first passed through the cover plate 7, and then the piston 4 is installed on the buffer rod 3, and the piston 4 is inserted into the buffer tube 2, and finally the cover plate 7 is fixed to the buffer cylinder 1; the connection method between the cover plate 7 and the buffer cylinder 1 can be bolted, which will not be repeated here.

[0029] In some embodiments, Figures 1 to 6 As shown, the bottom end of the buffer tube 2 is fixed on the buffer cylinder 1, and the top end of the buffer tube 2 is sealed with the cover plate 7; or, the bottom end of the buffer tube 2 abuts against the buffer cylinder 1, and the top end of the buffer tube 2 is sealed with the cover plate 7.

[0030] It should be noted that the buffer tube 2 can be fixed on the buffer cylinder 1, and the buffer tube 2 can also be directly placed in the buffer cylinder 1; when the buffer tube 2 is fixed on the buffer cylinder 1, the buffer tube 2 is a structure with an open top and a closed bottom, and a threaded hole is provided at the bottom of the buffer tube 2, and the bottom of the buffer cylinder 1 has a through hole aligned with the threaded hole of the buffer tube 2; the buffer cylinder 1 and the buffer tube 2 are fixed by bolts; the bottom of the buffer tube 2 has a sealing gasket, and the threaded hole at the bottom of the buffer tube 2 is a blind hole, so it can reduce the leakage of oil from the bottom of the buffer cylinder 1.

[0031] When the buffer tube 2 is directly placed in the buffer cylinder 1, the bottom of the buffer tube 2 can also be in an open form, the bottom end of the buffer tube 2 abuts against the bottom wall of the buffer cavity 11, and the top end of the buffer tube 2 abuts against the cover plate 7; through the above-mentioned setting, the buffer tube 2 can also be stably fixed in the buffer cylinder 1.

[0032] In some embodiments, Figures 1 to 6 As shown, the inner end of the buffer rod 3 has a threaded hole; the piston 4 is sleeved on the inner end of the buffer rod 3, and the piston 4 has a through hole aligned with the threaded hole on the buffer rod 3; the piston 4 and the buffer rod 3 are fixed by bolts; the threaded hole at the inner end of the buffer rod 3 is preferably in an eccentric position, and after the piston 4 is fixed by bolts, the rotation of the piston 4 around the buffer rod 3 can be limited.

[0033] The above arrangement makes it easy to remove the piston 4 from the buffer rod 3 and also makes it easy to install the piston 4 onto the buffer rod 3 .

[0034] In some embodiments, Figures 1 to 6 As shown, there is an oil seal ring 8 between the cover plate 7 and the top of the buffer tube 2, and the oil seal ring 8 is sealed with the buffer cavity 11; wherein, the bottom end of the oil seal ring 8 abuts against the buffer tube 2, and the top end of the oil seal ring 8 abuts against the cover plate 7; the cover plate 7 has a protruding ring 71 that is plugged into the buffer cavity 11, and the protruding ring 71 abuts against the oil seal ring 8.

[0035] It should be noted that, by providing the oil sealing ring 8 and the protruding ring 71, the sealing effect can be improved and the leakage of oil from the opening position of the buffer cylinder 1 can be reduced; by the oil sealing ring 8 abutting against the top end of the buffer tube 2, the installation position of the oil sealing ring 8 can be limited; after the cover plate 7 is fixed on the buffer cylinder 1, the oil sealing ring 8 abuts against the buffer tube 2, so the oil sealing ring 8 can also limit the position of the buffer tube 2.

[0036] In some embodiments, Figures 1 to 6 As shown, the impact ring 6 has a plurality of threaded holes, and the outer end of each buffer rod 3 has an external thread, and the buffer rod 3 is threadedly matched with the corresponding threaded holes on the impact ring 6.

[0037] It should be noted that each buffer rod 3 is threadedly matched with the impact ring 6, which facilitates the disassembly and assembly between the buffer rod 3 and the impact ring 6. When the impact ring 6 or one of the buffer rods 3 is damaged, the damaged part can be replaced without replacing the entire structure.

[0038] In some embodiments, Figures 1 to 6 As shown, the diameter of the second oil hole 24 is smaller than the diameter of the first oil hole 23. Through the above arrangement, when the piston 4 squeezes the lower chamber 22 downward, it is difficult for the oil to be discharged from the second oil hole 24, thereby increasing the resistance of the oil to the piston 4; when the piston 4 squeezes the upper chamber 21 upward, the oil is easier to be discharged from the first oil hole 23, thereby facilitating the upward reset of the piston 4.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An annular hydraulic buffer, characterized in that: include: The buffer cylinder is an annular structure, and a buffer cavity is provided inside the buffer cylinder; A plurality of buffer structures are arranged at intervals along the circumference of the buffer cylinder; Each of the buffer structures comprises: The buffer cylinder has an upper cavity and a lower cavity; the buffer cylinder has a first oil-passing hole at the upper cavity position, and the buffer cylinder has a plurality of rows of second oil-passing holes at the lower cavity position; A buffer rod, one end of which is slidably arranged in the buffer cylinder, and the other end of which is located outside the buffer rod; the inner end of the buffer rod is provided with a piston, and an elastic component is connected between the piston and the bottom of the buffer cylinder; Among them, the annular hydraulic buffer also includes a collision ring coaxially arranged with the buffer cylinder, and the collision ring is connected to the outer end of each buffer rod; when the piston slides to the bottom of the buffer cylinder, the piston can close the second oil holes row by row.

2. An annular hydraulic buffer according to claim 1, characterized in that: A one-way conduction area is formed between the second oil holes in the lowest row and the bottom of the buffer cylinder. A one-way valve is provided at the buffer cylinder in the one-way conduction area. The conduction direction of the one-way valve is from the outside of the buffer cylinder to the inside of the buffer cylinder.

3. The annular hydraulic buffer according to claim 1, characterized in that: The elastic component comprises a spring, one end of the spring is connected to the bottom of the buffer cylinder, and the other end of the spring is connected to the piston.

4. The annular hydraulic buffer according to claim 1, characterized in that: The buffer cavity is connected to one end of the buffer cylinder to form an opening; the buffer cylinder is detachably provided with a cover plate at the position of the open end, and the cover plate has a through hole for sliding cooperation with each buffer rod; Wherein, the piston is detachably connected to the buffer rod.

5. An annular hydraulic buffer according to claim 4, characterized in that: The bottom end of the buffer tube is fixed on the buffer cylinder, and the top end of the buffer tube is sealed with the cover plate; or, the bottom end of the buffer tube abuts against the buffer cylinder, and the top end of the buffer tube is sealed with the cover plate.

6. The annular hydraulic buffer according to claim 4, characterized in that: The inner end of the buffer rod is provided with a threaded hole; the piston is sleeved on the inner end of the buffer rod, and the piston has a through hole aligned with the threaded hole on the buffer rod; the piston is fixed to the buffer rod by bolts.

7. The annular hydraulic buffer according to claim 4, characterized in that: An oil seal ring is provided between the cover plate and the top of the buffer cylinder, and the oil seal ring is in sealing cooperation with the buffer cavity; Wherein, the bottom end of the oil seal ring abuts against the buffer cylinder, and the top end of the oil seal ring abuts against the cover plate.

8. An annular hydraulic buffer according to claim 7, characterized in that: The cover plate is provided with a protruding ring which is plugged into the buffer cavity, and the protruding ring abuts against the oil seal ring.

9. The annular hydraulic buffer according to claim 1, characterized in that: The impact ring is provided with a plurality of threaded holes, and the outer end of each buffer rod is provided with an external thread, and the buffer rod is threadably matched with the corresponding threaded hole on the impact ring.

10. The annular hydraulic buffer according to claim 1, characterized in that: The diameter of the second oil hole is smaller than the diameter of the first oil hole.

Images