CN111608578A - A percussion drill for drilling bored concrete pile construction - Google Patents
A percussion drill for drilling bored concrete pile construction Download PDFInfo
- Publication number
- CN111608578A CN111608578A CN202010483625.3A CN202010483625A CN111608578A CN 111608578 A CN111608578 A CN 111608578A CN 202010483625 A CN202010483625 A CN 202010483625A CN 111608578 A CN111608578 A CN 111608578A
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- CN
- China
- Prior art keywords
- wall
- steel cable
- fixedly connected
- percussion drill
- pile construction
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/003—Supports for the drilling machine, e.g. derricks or masts adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/04—Supports for the drilling machine, e.g. derricks or masts specially adapted for directional drilling, e.g. slant hole rigs
- E21B15/045—Hydraulic, pneumatic or electric circuits for their positioning
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
Abstract
The invention discloses a percussion drill for cast-in-situ bored pile construction, which comprises a base, wherein the top of the base is fixedly connected with a support rod, a reinforcing rib, a winch and a first pulley, the top end of the reinforcing rib is fixedly connected with the side wall of the support rod, the top end of the support rod is provided with a second pulley, and a steel cable is wound on the winch; according to the invention, the L-shaped block, the rolling shaft, the inner pipe, the movable groove, the steel ball, the limiting strip, the outer pipe and the like are arranged, and the auxiliary supporting mechanism consisting of the rolling shaft and the L-shaped block can effectively limit the steel cable released by the second pulley, so that the steel cable is prevented from shaking, meanwhile, the normal movement of the steel cable is not influenced while the mechanism is kept to effectively support the steel cable, and then the steel cable is always kept vertical to the ground when strong wind or underground obstacles are encountered, thereby ensuring the punching quality and improving the construction effect and the construction efficiency.
Description
Technical Field
The invention relates to the technical field of percussion drills, in particular to a percussion drill for bored pile construction.
Background
The percussion drill is a machine for drilling holes on rock stratum by using the impact force of drill bit, and is a common engineering apparatus for cast-in-place pile construction. The percussion drill includes a drill type and a wire rope type. The former has smaller bore diameter, lower efficiency and less application. The drill hole diameter of the drill bit is large, and the size of the drill bit can be modified according to the designed pile diameter. When the wire rope type percussion drill punches a hole, a drill bit is fixed at one end of a wire rope, and the ground is punched by utilizing the gravitational potential energy of the pulley block to pull the wire rope and the drill bit.
Because wire rope formula percussion drill is when punching a hole, when meetting strong wind or underground barrier, wire rope and ground are difficult to keep the vertical state for punch a hole and produce crooked condition, influence construction effect and construction progress.
Disclosure of Invention
The invention aims to provide a percussion drill for bored pile construction, which solves the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a percussion drill for bored pile construction comprises a base, wherein the top of the base is fixedly connected with a support rod, a reinforcing rib, a winch and a first pulley, the top end of the reinforcing rib is fixedly connected with the side wall of the support rod, a second pulley is arranged at the top end of the support rod, a steel cable is wound on the winch, a percussion drill bit is fixedly connected to the position, close to the top, of the support rod after the movable end of the steel cable winds around the first pulley and the second pulley, a support arm is fixedly connected to the position, close to the top, of the support rod, an auxiliary support mechanism is movably sleeved at the position, located right below the second pulley, of the steel cable, and the auxiliary support mechanism is fixedly connected with the support arm; an upper first mounting plate and a lower first mounting plate are fixedly arranged on the side wall of one side of the support rod, a lead screw is rotatably connected between the two first mounting plates, a motor is fixedly connected to the upper portion of the lower first mounting plate, the shaft extension end of the motor penetrates through the first mounting plates and is then coaxially and fixedly connected with the lead screw, and a U-shaped plate is rotatably sleeved on the lead screw; the outer wall of the U-shaped plate is provided with a multi-stage oil cylinder, the movable end of the multi-stage oil cylinder is fixedly connected with a retaining mechanism, and the retaining mechanism is movably sleeved on the steel cable.
As a further scheme of the invention: the auxiliary supporting mechanism comprises four L-shaped blocks, the four L-shaped blocks are distributed in a cross shape, rolling shafts are connected between the side walls of every two adjacent L-shaped blocks in a rotating mode, and the steel cable is located between the four rolling shafts.
As a further scheme of the invention: the circumference outer wall of roller bearing is the arc of indent, the circumference outer wall of roller bearing and the outer wall laminating of steel cable.
As a further scheme of the invention: an upper second mounting plate and a lower second mounting plate are fixedly connected to one side of the supporting rod opposite to the side wall where the first mounting plate is located, and the two second mounting plates and the two first mounting plates are located in the same plane respectively; a sliding rod parallel to the screw rod is fixedly connected between the two second mounting plates, and the outer wall of the sliding rod is sleeved with a sliding sleeve in a sliding manner; the U-shaped plate is formed by connecting two side vertical plates and a middle transverse plate, the end part of one side vertical plate is rotatably sleeved on the screw rod, and the end part of the other side vertical plate is fixedly connected with the sliding sleeve, so that the U-shaped plate moves up and down along the screw rod and the sliding rod.
As a further scheme of the invention: a slide rail is arranged on the side wall of one side of the support rod corresponding to the transverse plate of the U-shaped plate along the length direction of the support rod, a slide groove is arranged at a corresponding position on the inner wall of the transverse plate of the U-shaped plate, and the slide groove is slidably arranged on the slide rail; a supporting plate is arranged on the outer side of a transverse plate of the U-shaped plate 19, and the multi-stage oil cylinder 21 is fixed on the supporting plate.
As a further scheme of the invention: the retaining mechanism comprises an outer pipe, an inner pipe is arranged inside the outer pipe, and a plurality of groups of steel balls are arranged between the inner pipe and the outer pipe.
As a still further scheme of the invention: the steel ball bearing is characterized in that a plurality of movable grooves are formed in the side wall of the inner pipe, a plurality of groups of steel balls are respectively located in the corresponding movable grooves, a plurality of limiting strips are fixedly connected to the inner wall of the outer pipe and located in the corresponding movable grooves, and each group of steel balls are surrounded on the periphery of the corresponding limiting strips.
As a still further scheme of the invention: the outer wall of the steel cable is not in contact with the inner wall of the inner pipe, and the outer wall of the steel cable is in contact with the outer wall of the steel ball.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the L-shaped block, the rolling shaft, the inner pipe, the movable groove, the steel balls, the limiting strip, the outer pipe and the like are arranged, and the auxiliary supporting mechanism consisting of the rolling shaft and the L-shaped block can effectively limit the steel cable released by the second pulley, so that the steel cable is prevented from shaking, meanwhile, the mechanism is kept in contact with the outer wall of the steel cable through the steel balls, when the steel cable moves up and down in the inner pipe, each group of steel balls can rotate around the limiting strip in the corresponding movable groove, thereby ensuring the effective support of the steel cable, not influencing the normal movement of the steel cable, and further, when strong wind or underground obstacles are encountered, the steel cable is always kept vertical to the ground, thereby ensuring the punching quality, and improving the construction effect and the.
2. The invention can lift the U-shaped plate and the multi-stage oil cylinder by arranging the motor, the screw rod, the U-shaped plate, the slide rod, the slide rail and the like and driving the screw rod to rotate by the motor so as to adjust the height of the retaining mechanism, thereby providing good support for a steel cable while not influencing the normal action of the percussion bit, and enabling the retaining mechanism to be always positioned right below the auxiliary supporting mechanism by using the multi-stage oil cylinder so as to ensure the verticality of the steel cable.
Drawings
Fig. 1 is a schematic structural diagram of a percussion drill for bored pile construction.
Fig. 2 is a schematic structural diagram of an auxiliary supporting mechanism in a percussion drill for bored pile construction.
Fig. 3 is a schematic structural diagram of a U-shaped plate in a percussion drill for bored pile construction.
Fig. 4 is a schematic structural diagram of a retaining mechanism in a percussion drill for bored pile construction.
Fig. 5 is a schematic structural view of a movable groove in a percussion drill for bored pile construction.
In the figure: the device comprises a base 1, a support rod 2, a reinforcing rib 3, a winch 4, a first pulley 5, a second pulley 6, a steel cable 7, a percussion bit 8, a support arm 9, an auxiliary supporting mechanism 10, an L-shaped block 11, a roller 12, a first mounting plate 13, a lead screw 14, a motor 15, a second mounting plate 16, a sliding rod 17, a sliding rail 18, a U-shaped plate 19, a sliding groove 20, a multi-stage oil cylinder 21, a retaining mechanism 22, an inner pipe 23, a movable groove 24, steel balls 25, a limiting strip 26 and an outer pipe 27.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, in an embodiment of the present invention, a percussion drill for bored pile construction includes a base 1, a support rod 2, a reinforcing rib 3, a winch 4, and a first pulley 5 are fixedly connected to the top of the base 1, the top end of the reinforcing rib 3 is fixedly connected to the side wall of the support rod 2, a second pulley 6 is disposed at the top end of the support rod 2, a steel cable 7 is wound on the winch 4, a percussion drill 8 is fixedly connected to the position of the support rod 2 near the top after the movable end of the steel cable 7 passes over the first pulley 5 and the second pulley 6, an auxiliary support mechanism 10 is movably sleeved to the position of the steel cable 7 right below the second pulley 6, and the auxiliary support mechanism 10 is fixedly connected to the support arm 9; an upper first mounting plate 13 and a lower first mounting plate 13 are fixedly arranged on the side wall of one side of the support rod 2, a screw rod 14 is rotatably connected between the two first mounting plates 13, a motor 15 is fixedly connected to the upper portion of the lower first mounting plate 13, the shaft extension end of the motor 15 penetrates through the first mounting plate 13 and is coaxially and fixedly connected with the screw rod 14, and a U-shaped plate 19 is rotatably sleeved on the screw rod 14; the outer wall of the U-shaped plate 19 is provided with a multi-stage oil cylinder 21, the movable end of the multi-stage oil cylinder 21 is fixedly connected with a retaining mechanism 22, and the retaining mechanism 22 is movably sleeved on the steel cable 7.
The auxiliary supporting mechanism 10 comprises four L-shaped blocks 11, the four L-shaped blocks 11 are distributed in a cross shape, the side walls of every two adjacent L-shaped blocks 11 are connected with rollers 12 in a rotating mode, and the steel cable 7 is located between the four rollers 12.
The circumference outer wall of roller 12 is the arc of indent, and the circumference outer wall of roller 12 and the outer wall laminating of steel cable 7, four rollers 12 can carry out effectual spacing to steel cable 7 under the release by second pulley 6, avoid steel cable 7 to take place to rock, do not influence the normal removal of steel cable 7 simultaneously.
An upper second mounting plate 16 and a lower second mounting plate 16 are fixedly connected to one side of the support rod 2 opposite to the side wall where the first mounting plate 13 is located, and the two second mounting plates 16 and the two first mounting plates 13 are located in the same plane respectively; a sliding rod 17 parallel to the screw rod 14 is fixedly connected between the two second mounting plates 16, and the outer wall of the sliding rod 17 is sleeved with a sliding sleeve in a sliding manner; the U-shaped plate 19 is formed by connecting vertical plates on two sides and a transverse plate in the middle, the end part of the vertical plate on one side is rotatably sleeved on the screw rod 14, and the end part of the vertical plate on the other side is fixedly connected with the sliding sleeve, so that the U-shaped plate 19 moves up and down along the screw rod and the sliding rod 17. A supporting plate is arranged on the outer side of a transverse plate of the U-shaped plate 19, and the multi-stage oil cylinder 21 is fixed on the supporting plate.
The holding mechanism 22 includes an outer tube 27, an inner tube 23 is disposed inside the outer tube 27, and a plurality of sets of steel balls 25 are disposed between the inner tube 23 and the outer tube 27.
The side wall of the inner tube 23 is provided with a plurality of movable grooves 24, a plurality of groups of steel balls 25 are respectively positioned in the corresponding movable grooves 24, the inner wall of the outer tube 27 is fixedly connected with a plurality of limiting strips 26, the limiting strips 26 are positioned in the corresponding movable grooves 24, and each group of steel balls 25 surrounds the periphery of the corresponding limiting strips 26.
The outer wall of the wire rope 7 is not in contact with the inner wall of the inner tube 23, and the outer wall of the wire rope 7 is in contact with the outer wall of the steel ball 25.
The screw rod 14 is driven to rotate by the starting motor 15, the U-shaped plate 19 is driven to lift by utilizing the limiting and guiding effects of the screw rod 14, the threads of the U-shaped plate 19, the sliding rail 18 and the like on the U-shaped plate 19, so that the height of the retaining mechanism 22 is adjusted, and meanwhile, the retaining mechanism 22 can be always positioned right below the auxiliary supporting mechanism 10 by being matched with the multi-stage oil cylinder 21 to ensure the perpendicularity of the steel wire rope.
The holding mechanism 22 is contacted with the outer wall of the steel cable 7 through the steel balls 25, when the steel cable 7 moves up and down in the inner pipe 23, each group of steel balls 25 can rotate around the limit strip 26 in the corresponding movable groove 24, thereby ensuring effective support for the steel cable 7 and not influencing the normal movement of the steel cable 7.
The working principle of the invention is as follows:
the four rollers 12 can effectively limit the steel cable 7 released by the second pulley 6, so that the steel cable 7 is prevented from shaking, and the normal movement of the steel cable 7 is not influenced.
The screw rod 14 is driven to rotate by the starting motor 15, the U-shaped plate 19 is driven to lift by utilizing the limiting and guiding effects of the screw rod 14, the threads of the U-shaped plate 19, the sliding rail 18 and the like on the U-shaped plate 19, so that the height of the retaining mechanism 22 is adjusted, and meanwhile, the retaining mechanism 22 can be always positioned right below the auxiliary supporting mechanism 10 by being matched with the multi-stage oil cylinder 21 to ensure the perpendicularity of the steel wire rope.
The holding mechanism 22 is contacted with the outer wall of the steel cable 7 through the steel balls 25, when the steel cable 7 moves up and down in the inner pipe 23, each group of steel balls 25 can rotate around the limit strip 26 in the corresponding movable groove 24, thereby ensuring effective support for the steel cable 7 and not influencing the normal movement of the steel cable 7.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a percussion drill for bored concrete pile construction, includes base (1), its characterized in that: the top of the base (1) is fixedly connected with a supporting rod (2), a reinforcing rib (3), a winch (4) and a first pulley (5), the top end of the reinforcing rib (3) is fixedly connected with the side wall of the supporting rod (2), the top end of the supporting rod (2) is provided with a second pulley (6), a steel cable (7) is wound on the winch (4), the movable end of the steel cable (7) is fixedly connected with an impact drill bit (8) after winding around the first pulley (5) and the second pulley (6), the position, close to the top, of the supporting rod (2) is fixedly connected with a supporting arm (9), an auxiliary supporting mechanism (10) is movably sleeved at the position, located right below the second pulley (6), of the steel cable (7), and the auxiliary supporting mechanism (10) is fixedly connected with the supporting arm (9); fixed two upper and lower first mounting panel (13) of being provided with on the lateral wall of one side of branch (2), two rotate between first mounting panel (13) and be connected with lead screw (14), last fixedly connected with motor (15) of first mounting panel (13) of lower part, the axle of motor (15) is stretched the end and is run through the back of first mounting panel (13) and the coaxial fixed connection of lead screw (14), it has cup jointed U template (19) to rotate on lead screw (14), the outer wall of U template (19) is provided with multi-stage cylinder (21), the expansion end fixedly connected with hold mechanism (22) of multi-stage cylinder (21), hold mechanism (22) activity is cup jointed on steel cable (7).
2. The percussion drill for bored pile construction according to claim 1, wherein: the auxiliary supporting mechanism (10) comprises four L-shaped blocks (11), the four L-shaped blocks (11) are distributed in a cross shape, rolling shafts (12) are connected between the side walls of every two adjacent L-shaped blocks (11) in a rotating mode, and the steel cable (7) is located between the four rolling shafts (12).
3. The percussion drill for bored pile construction according to claim 2, wherein: the circumference outer wall of roller bearing (12) is the arc of indent, the circumference outer wall of roller bearing (12) and the outer wall laminating of steel cable (7).
4. The percussion drill for bored pile construction according to claim 1, wherein: an upper second mounting plate and a lower second mounting plate (16) are fixedly connected to one side of the support rod (2) opposite to the side wall where the first mounting plate (13) is located, and the two second mounting plates (16) are respectively located in the same plane with the two first mounting plates (13); a sliding rod (17) parallel to the screw rod (14) is fixedly connected between the two second mounting plates (16), and the outer wall of the sliding rod (17) is sleeved with a sliding sleeve in a sliding manner; u template (19) are formed by connecting both sides riser and middle diaphragm, and the tip of one side riser rotates the suit on lead screw (14), the tip of opposite side riser with sliding sleeve fixed connection makes U template (19) reciprocate along lead screw and slide bar (17).
5. The percussion drill for bored pile construction according to claim 4, wherein: a sliding rail (18) is arranged on the side wall of one side of the support rod (2) corresponding to the transverse plate of the U-shaped plate (19) along the length direction of the side wall, a sliding groove (20) is formed in the corresponding position on the inner wall of the transverse plate of the U-shaped plate (19), and the sliding groove (20) is slidably mounted on the sliding rail (18); the lateral plate of U-shaped board (19) outside sets up the backup pad, and multistage cylinder (21) are fixed in the backup pad.
6. The percussion drill for bored pile construction according to claim 1, wherein: the holding mechanism (22) comprises an outer tube (27), an inner tube (23) is arranged inside the outer tube (27), and a plurality of groups of steel balls (25) are arranged between the inner tube (23) and the outer tube (27).
7. The percussion drill for bored pile construction according to claim 6, wherein: a plurality of movable grooves (24) are formed in the side wall of the inner tube (23), a plurality of groups of steel balls (25) are respectively located in the corresponding movable grooves (24), a plurality of limiting strips (26) are fixedly connected to the inner wall of the outer tube (27), the limiting strips (26) are located in the corresponding movable grooves (24), and each group of steel balls (25) is surrounded on the periphery of the corresponding limiting strips (26).
8. The percussion drill for bored pile construction according to claim 7, wherein: the outer wall of the steel cable (7) is not in contact with the inner wall of the inner pipe (23), and the outer wall of the steel cable (7) is in contact with the outer wall of the steel ball (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010483625.3A CN111608578B (en) | 2020-06-01 | 2020-06-01 | A percussion drill for drilling bored concrete pile construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010483625.3A CN111608578B (en) | 2020-06-01 | 2020-06-01 | A percussion drill for drilling bored concrete pile construction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111608578A true CN111608578A (en) | 2020-09-01 |
| CN111608578B CN111608578B (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010483625.3A Active CN111608578B (en) | 2020-06-01 | 2020-06-01 | A percussion drill for drilling bored concrete pile construction |
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| Country | Link |
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| CN (1) | CN111608578B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187850A (en) * | 2021-05-08 | 2021-07-30 | 中铁工程机械研究设计院有限公司 | Large-stroke impact buffering device and impact crushing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101338572A (en) * | 2008-08-12 | 2009-01-07 | 石宗利 | Posthole digger |
| CN202401964U (en) * | 2011-11-22 | 2012-08-29 | 河南省三力机械制造有限公司 | Long spiral long-hole drilling machine |
| CN205063835U (en) * | 2015-09-01 | 2016-03-02 | 山东科瑞机械制造有限公司 | Novel hydraulic drive derrick mechanism |
| CN205840770U (en) * | 2016-08-09 | 2016-12-28 | 屈建泽 | A kind of impact type rotary drilling rig device being applicable to heavy caliber construction |
| CN206290207U (en) * | 2016-12-23 | 2017-06-30 | 北京航勘建设有限公司 | A kind of modified bored pile construction rig |
| CN110965937A (en) * | 2019-12-31 | 2020-04-07 | 福建建中建设科技有限责任公司 | Double-power whole-course pump suction reverse circulation punching equipment and construction process |
-
2020
- 2020-06-01 CN CN202010483625.3A patent/CN111608578B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338572A (en) * | 2008-08-12 | 2009-01-07 | 石宗利 | Posthole digger |
| CN202401964U (en) * | 2011-11-22 | 2012-08-29 | 河南省三力机械制造有限公司 | Long spiral long-hole drilling machine |
| CN205063835U (en) * | 2015-09-01 | 2016-03-02 | 山东科瑞机械制造有限公司 | Novel hydraulic drive derrick mechanism |
| CN205840770U (en) * | 2016-08-09 | 2016-12-28 | 屈建泽 | A kind of impact type rotary drilling rig device being applicable to heavy caliber construction |
| CN206290207U (en) * | 2016-12-23 | 2017-06-30 | 北京航勘建设有限公司 | A kind of modified bored pile construction rig |
| CN110965937A (en) * | 2019-12-31 | 2020-04-07 | 福建建中建设科技有限责任公司 | Double-power whole-course pump suction reverse circulation punching equipment and construction process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187850A (en) * | 2021-05-08 | 2021-07-30 | 中铁工程机械研究设计院有限公司 | Large-stroke impact buffering device and impact crushing equipment |
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| CN111608578B (en) | 2021-11-16 |
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