CN210768611U - Handheld drilling machine with improved built-in silencer - Google Patents
Handheld drilling machine with improved built-in silencer Download PDFInfo
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- CN210768611U CN210768611U CN201921273691.7U CN201921273691U CN210768611U CN 210768611 U CN210768611 U CN 210768611U CN 201921273691 U CN201921273691 U CN 201921273691U CN 210768611 U CN210768611 U CN 210768611U
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Abstract
The utility model belongs to the technical field of mechanical equipment, a handheld rig with built-in silencing device of improved generation is related to, which comprises a housing, the protecgulum, the back lid, the output shaft, pneumatic type power device, air inlet unit, the exhaust hole, the first in command, the silencing device in the second handle and locating the casing, silencing device includes the front end splicing piece, the rear end splicing piece, locate a plurality of A splicing pieces between front end splicing piece and the rear end splicing piece and locate the B splicing piece between two adjacent A splicing pieces, front end splicing piece upper portion is equipped with the inlet port, rear end splicing piece lower part is equipped with the venthole, the front end splicing piece, the rear end splicing piece, can form upper orifice plate amortization room in inside after A splicing piece and the B splicing piece, middle level ripple amortization room and lower floor's orifice plate amortization room. The silencer of the utility model has convenient assembly and disassembly, simple processing technique and higher manufacturability and practicability; in addition, three layers of silencing chambers can be formed, and the silencing and noise reducing effects of the drilling machine are greatly improved.
Description
Technical Field
The utility model belongs to the technical field of mechanical equipment, a handheld rig with built-in silencing device of improved generation is related to.
Background
Coal mines in China are mainly underground mining, a large number of roadways need to be excavated underground, roadway support is adopted to protect smooth roadways and surrounding rock stability, and the important significance is brought to mine construction and production, drilling operation needs to be carried out by adopting a drilling machine in the construction process of roadway support, in order to meet the underground explosion-proof safety requirement of mines, a handheld pneumatic drilling machine with underground compressed air as a power source is often adopted for construction, but the handheld pneumatic drilling machine can generate high noise during working, and the manual pneumatic drilling machine can generate fussy emotion when working for a long time in the environment, so that safety accidents are easily caused, even the symptoms such as deafness and headache of workers can be directly caused, and the body health of the workers is seriously damaged;
the existing solution is that a silencer is often arranged at an air outlet of a shell of the drilling machine, and the added silencer has poor silencing effect, greatly increases the volume and the weight of the drilling machine, and is very inconvenient to use;
in order to solve the technical problem, the inventor provides a handheld drilling machine with a built-in silencer in patent No. 201910514950.9, and the silencer is arranged inside the drilling machine, so that the volume of the drilling machine is reduced, the construction operation is convenient, and the noise reduction effect is greatly improved; in order to make the handheld drilling machine more convenient for industrial production and have more excellent noise reduction effect, the inventor further improves the built-in noise reduction device.
SUMMERY OF THE UTILITY MODEL
For solving the problem that proposes among the above-mentioned background art, the utility model provides a built-in silencing device is convenient for production and processing, dismantles the convenient handheld rig that just the amortization noise reduction effect is more excellent of equipment.
The utility model provides a technical problem adopt following technical scheme to realize:
a handheld drilling machine with an improved built-in silencer comprises a casing, a front cover arranged at the front end of the casing, a rear cover arranged at the rear end of the casing, an output shaft, a pneumatic power device, an air inlet device, an exhaust hole, a first handle, a second handle and a silencer, wherein the output shaft is located in the casing, the pneumatic power device is used for driving the output shaft to rotate, the air inlet device is used for introducing outside air into the casing, the exhaust hole is formed in the front cover, the first handle is arranged on one side of the casing, the second handle is arranged on the other side of the casing, the silencer is arranged in the casing, the silencer comprises a front splicing piece, a rear splicing piece, a plurality of A splicing pieces and B splicing pieces, the A splicing pieces are arranged between the front splicing piece and the rear splicing piece, an air inlet hole is formed in the upper portion of the front splicing piece, an air outlet hole is formed in the lower portion of the rear splicing piece, After the rear splicing piece, the splicing piece A and the splicing piece B are spliced, an upper-layer pore plate silencing chamber, a middle-layer corrugated silencing chamber and a lower-layer pore plate silencing chamber can be formed inside; after entering the silencing device through the air inlet, the air flow in the shell passes through the upper-layer pore plate silencing chamber, the middle-layer corrugated silencing chamber and the lower-layer pore plate silencing chamber in sequence for silencing, is discharged out of the silencing device through the air outlet and then is discharged to the outside through the air outlet; the splicing piece A is matched with the splicing piece B through a splicing structure.
The splicing structure comprises a first plug connector, a second plug connector and a third plug connector capable of being spliced between the first plug connector and the second plug connector.
The first connector piece comprises a first lower horizontal part, the second connector piece comprises a second upper horizontal part, and the third connector piece comprises a third upper horizontal part, a third lower horizontal part and a first triangular bulge arranged on the lower surface of the third upper horizontal part; when the first connector clip, the second connector clip and the third connector clip are spliced and matched, the lower surface of the first lower horizontal part is attached to the upper surface of the third upper horizontal part, and the upper surface of the second upper horizontal part is attached to the lower surface of the third lower horizontal part.
The middle part of the splicing piece A is provided with a first strip-shaped through hole, the upper part of the splicing piece A is provided with a plurality of first silencing holes, and the lower part of the splicing piece A is provided with a plurality of second silencing holes; the first connector and the second connector are arranged on one side of the splicing piece A, the first connector is arranged at the corresponding position of the first silencing hole, and the second connector is arranged at the corresponding position of the second silencing hole; and a third plug connector is arranged on the other side of the splice A, the third plug connector is arranged at the position of the first strip-shaped through hole, and a second triangular protrusion is arranged on the lower wall of the inner side of the first strip-shaped through hole.
A second strip-shaped through hole is formed in the middle of the splicing piece B, a plurality of third silencing holes are formed in the upper portion of the splicing piece B, a plurality of fourth silencing holes are formed in the lower portion of the splicing piece B, the first plug connector and the second plug connector are arranged on one side of the splicing piece B, the first plug connector is arranged at the position corresponding to the third silencing holes, and the second plug connector is arranged at the position corresponding to the fourth silencing holes; and a third plug connector is arranged on the other side of the splicing part B, the third plug connector is arranged at the position of the second strip-shaped through hole, and a third triangular protrusion is arranged on the lower wall of the inner side of the second strip-shaped through hole.
When the splicing piece A and the splicing piece B are spliced and matched, the position of the third silencing hole and the position of the first silencing hole are arranged in a staggered mode, and the position of the fourth silencing hole and the position of the second silencing hole are arranged in a staggered mode.
A first plug connector and a front end flow guide member are arranged on one side of the front end splicing member, and the first plug connector is arranged at the position corresponding to the air inlet; when the front end splicing piece is spliced and matched with the splicing piece A, the third splicing piece on the splicing piece A is inserted between the first splicing piece on the front end splicing piece and the front end flow guide piece, and the air inlet on the front end splicing piece and the first silencing hole on the splicing piece A are arranged in a staggered mode.
A rear end flow guide part is arranged on one side of the rear end splicing part; when the rear end splicing piece is spliced and matched with the splicing piece A, the rear end flow guide piece on the rear end splicing piece is inserted between the first splicing piece and the second splicing piece on the splicing piece A, and the position of the air outlet hole on the rear end splicing piece and the position of the second silencing hole on the splicing piece A are arranged in a staggered mode.
And the front end splicing piece, the rear end splicing piece, the splicing piece A and the splicing piece B are spliced and then fixed through a bolt.
The utility model has the advantages that:
1) the utility model discloses silencing device is formed by several splices concatenation, and each splice is formed through the mould direct pressing, and processing technology is simple and convenient, is convenient for the industrial mass production; the splicing pieces are convenient to mount and dismount, convenient to maintain and replace and very high in practicability;
2) the utility model discloses can form the three-layer anechoic chamber in the silencing device, the air current can loop through this three-layer anechoic chamber in the casing, sets up the effect of making an uproar of falling that can improve the amortization of rig greatly like this, can guarantee good operational environment, has also significantly reduced the injury to the staff health simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of a partial explosion structure of the present invention.
Fig. 3 is a schematic diagram of a partial explosion structure of the present invention.
Fig. 4 is an exploded view of the muffler device of the present invention.
Fig. 5 is an exploded view of the silencer of the present invention.
Fig. 6 is a schematic structural view of the splice of the present invention a.
Fig. 7 is a schematic structural view of the splice of the present invention B.
Fig. 8 is a schematic structural view of the front end splicing member of the present invention.
Fig. 9 is a schematic structural view of the rear end splicing member of the present invention.
Fig. 10 is a schematic view of a partial cross-sectional structure of the present invention.
Fig. 11 is an enlarged view of a portion a in fig. 10.
Fig. 12 is an enlarged view at B in fig. 11.
Fig. 13 is a first plan view of the present invention with a partial cross-section structure.
Fig. 14 is a schematic plan view of the present invention with a partial cross-sectional structure.
Detailed Description
As shown in fig. 1-14, a hand-held drilling machine with an improved built-in silencer comprises a machine shell 1, a front cover 11, a rear cover 12, an output shaft 2, a pneumatic power device, an air inlet device 4, a first handle 5, a second handle 6 and a silencer 7; the front end of the casing 1 is provided with a front cover 11, the bottom of the front cover 11 is provided with an exhaust hole 111, and the rear end of the casing 1 is provided with a rear cover 12 and a gland 13; the first handle 5 is arranged on one side of the machine shell 1, the second handle 6 is arranged on the other side of the machine shell 1, and preferably, the machine shell 1, the first handle 5 and the second handle 6 are integrally cast by adopting aluminum alloy;
the silencer is characterized in that a silencer 7 is arranged inside the machine shell 1, specifically, the silencer 7 comprises a front splicing piece 71, a rear splicing piece 72, a plurality of splicing pieces A73 and a plurality of splicing pieces B74, the plurality of splicing pieces A73 are arranged between the front splicing piece 71 and the rear splicing piece 72, preferably, the number of the splicing pieces A73 is three, the number of the splicing pieces B74 are arranged between the adjacent splicing pieces A, and preferably, the number of the splicing pieces B74 is two, namely, the silencer is formed by sequentially splicing the front splicing piece, the splicing pieces A, the splicing pieces B, the splicing pieces A and the splicing pieces at the rear end from front to rear;
the splicing pieces A73 and the splicing pieces B74 are matched through a splicing structure, specifically, the splicing structure comprises a first splicing piece 81, a second splicing piece 82 and a third splicing piece 83, the first splicing piece 81 is of a frame-shaped structure and comprises a first lower horizontal part 811, a first side part 812 and a first upper side part 813, the number of the first side parts 812 is two, the number of the second splicing pieces 82 is of a frame-shaped structure and comprises a second upper horizontal part 821, a second side part 822 and a second lower side part 823, and the number of the second side parts 822 is two; the third plug-in connector 83 is of a frame-shaped structure and comprises a third upper horizontal part 831, a second lower horizontal part 832, a first triangular protrusion 833 and a third side part 834, wherein the number of the third side part 834 is two, and the first triangular protrusion 833 is arranged on the lower surface of the third upper horizontal part 831;
the third plug connector can be inserted between the first plug connector and the second plug connector, when the first plug connector, the second plug connector and the third plug connector are in plug fit, the lower surface of the first lower horizontal part of the first plug connector is attached to the upper surface of the third upper horizontal part, and the upper surface of the second upper horizontal part is attached to the lower surface of the third lower horizontal part;
the middle part of the a-splicing piece 73 is provided with a first strip-shaped through hole 731, the lower wall of the inner side of the first strip-shaped through hole 731 is provided with a second triangular protrusion 734, the a-splice 73 has a plurality of first muffling holes 732 in the upper portion and a plurality of second muffling holes 733 in the lower portion, a first plug connector 81 and a second plug connector 82 are arranged on one side of the splicing part A73, the first plug connector 81 is arranged at the corresponding position of the first silencing hole 732, the second plug-in component 82 is arranged at a position corresponding to the second muffling hole 733, the other side of the a-splicing component 73 is provided with a third plug-in component 83, the third plug connector 83 is disposed at the position of the first strip-shaped through hole 731, preferably, a first protruding ring 735 is disposed at the edge of the side of the splice a 73, and the first protruding ring, the first plug connector, the second plug connector, and the third plug connector are preferably integrally formed with the splice a;
a second strip-shaped through hole 741 is arranged in the middle of the splicing element B74, a third triangular protrusion 744 is arranged on the lower wall of the inner side of the second strip-shaped through hole 741, a plurality of third muffling holes 742 are arranged on the upper portion of the second strip-shaped through hole 741, a plurality of fourth muffling holes 743 are arranged on the lower portion of the second strip-shaped through hole, the first plug connector 81 and the second plug connector 82 are arranged on one side of the splicing element B74, the first plug connector 81 is arranged at the corresponding position of the third muffling hole 742, and the second plug connector 82 is arranged at the corresponding position of the fourth muffling hole 743; the other side of the splice B74 is provided with a third plug connector 83, the third plug connector 83 is arranged at the position of the second strip-shaped through hole 741, preferably, a second raised ring 745 is arranged at the edge position of the side of the splice B74, and preferably, the second raised ring, the first plug connector, the second plug connector and the third plug connector are integrally formed with the splice B;
when the splicing piece A is spliced with the splicing piece B, the position of a third silencing hole on the splicing piece B is staggered with the position of a first silencing hole on the splicing piece A, and the position of a fourth silencing hole on the splicing piece B is staggered with the position of a second silencing hole on the splicing piece A; when the splicing pieces A and the splicing pieces B are spliced and matched, the splicing pieces B can be spliced between two adjacent splicing pieces A only by inserting the third plug connector on the splicing piece B between the first plug connector and the second plug connector on the splicing piece A and simultaneously inserting the third plug connector of the other splicing piece A between the first plug connector and the second plug connector of the splicing piece B; meanwhile, the arrangement of the first triangular protrusion 833, the second triangular protrusion 734 and the third triangular protrusion 744 can enable the airflow to play a role in ripple noise reduction when passing through the first strip-shaped through hole and the second strip-shaped through hole;
the upper part of the front end splicing piece 71 is provided with a plurality of air inlet holes 711, one side of the front end splicing piece 71 is provided with a first plug connector 81 and a front end flow guide piece 84, the first plug connector 81 is arranged at the corresponding position of the air inlet holes 711, the front end flow guide piece 84 comprises a front end lower edge part 841, a front end side edge part 842 and a front end horizontal extension part 843, the front end side edge part 842 is provided with two parts which are respectively positioned at two ends of the front end lower edge part 841, and the front end horizontal extension part 843 is arranged at the inner position of the upper end of the front end side edge part; when the front end splicing piece is spliced and matched with the splicing piece A, the third splicing piece of the splicing piece A is inserted into the middle of the first splicing piece 81 and the front end flow guide piece 84, at the moment, the upper surface of the third upper horizontal part of the third splicing piece is attached to the lower surface of the first lower horizontal part of the first splicing piece, and the lower surface of the third lower horizontal part of the third splicing piece is attached to the upper surface of the front end horizontal extension part of the front end flow guide piece; the air inlet holes 711 on the front end splicing piece 71 are arranged in a staggered way with the first silencing holes 732 on the splicing piece A;
the lower part of the rear end splicing piece 72 is provided with an air outlet 721, one side of the middle position of the rear end splicing piece 72 is provided with a rear end flow guide piece 85, the rear end flow guide piece 85 comprises a rear end lower horizontal part 851, a rear end side part 852 and a rear end horizontal extension part 853, the two rear end side parts 852 are respectively arranged at two ends of the rear end lower horizontal part 851, and the rear end horizontal extension part 853 is arranged at the inner side position of the upper end of the rear end side part; when the rear end splicing piece is spliced and matched with the splicing piece A, the rear end flow guide piece of the rear end splicing piece is inserted between the first splicing piece and the second splicing piece of the splicing piece A, the lower surface of the rear end lower horizontal part of the rear end splicing piece is attached to the upper surface of the second upper horizontal part of the second splicing piece, and the upper surface of the rear end horizontal extension part of the rear end splicing piece is attached to the lower surface of the first lower horizontal part of the first splicing piece; the air outlet 721 on the rear splicing piece is staggered with the second silencing hole 733 on the splicing piece A;
preferably, in order to further improve the splicing firmness of each splicing piece of the silencer, the splicing pieces are fastened through bolts 78, specifically, a first screw hole 712 is formed in the front end splicing piece 71, a second screw hole 722 is formed in the rear end splicing piece 72, a third screw hole 736 is formed in the splicing piece A, a fourth screw hole 746 is formed in the splicing piece B, after the front end splicing piece, the rear end splicing piece, the splicing piece A and the splicing piece B are spliced, the positions of the first screw hole, the second screw hole, the third screw hole and the fourth screw hole correspond to each other, then the bolts penetrate through the screw holes, and the splicing pieces of the silencer can be fastened through nut fastening;
after the front end splicing piece, the three splicing pieces A, the two splicing pieces B and the rear end splicing piece are spliced, an upper-layer pore plate silencing chamber 75, a middle-layer corrugated silencing chamber 76 and a lower-layer pore plate silencing chamber 77 can be formed inside the front end splicing piece, and after air flow in the machine shell enters the silencing device through an air inlet of the front end splicing piece, the air flow sequentially passes through the upper-layer pore plate silencing chamber, the middle-layer pore plate silencing chamber and the lower-layer pore plate silencing chamber, is discharged from an air outlet of the rear end splicing piece and is finally discharged to the outside through an air outlet at the lower end of the front cover;
the silencing device is formed by splicing the splicing pieces, and the splicing pieces are directly pressed by a die, so that the silencing device is simple in processing technology, convenient to assemble and disassemble and high in practicability; meanwhile, the three silencing chambers greatly improve the silencing effect of the silencing device, and the inventor tests that the decibel number of the handheld pneumatic drilling machine provided by the embodiment can be reduced by at least 25 decibels compared with that of a common handheld pneumatic drilling machine in the working process;
the air inlet device 4 is matched with the first handle 5, specifically, the air inlet device 4 includes an open cavity 41, a connector base 42, a valve rod 43, a pressure rod 44, a valve core 45, a spring 46 and a channel 47, the open cavity 41 is arranged on the first handle 5, the connector base 42 is arranged at an opening of the open cavity 41, the valve rod 43 is arranged at the upper end of the open cavity 41, the upper end of the valve rod 43 is matched with the pressure rod 44, a holding part of the pressure rod 44 is positioned outside the first handle 5, the valve rod 43 is connected with the valve core 45, the spring 46 is arranged in front of the connector base 42 and the valve core 45, preferably, a first sealing ring 451 is arranged on the valve core 45, the first sealing ring 451 is an O-shaped sealing ring, a second sealing ring 431 is arranged at the upper end of the valve rod 43, the second sealing ring 431 is an O-shaped sealing ring, and one end of the channel 47 is communicated with the open cavity 41, the other end of the channel 47 is communicated with the machine shell 1;
the compressed air from the outside enters the inside of the casing 1 through the open cavity 41 and the channel 42 in sequence, and then the pneumatic power device drives the output shaft 2 to rotate, specifically, the pneumatic power device comprises a rotating shaft 31, a driving gear 32 and a driven gear 33, the rotating shaft 31 is arranged in the machine shell 1, two ends of the rotating shaft 31 are respectively matched with the shell 1 through a first bearing 311, the driving gear 32 is sleeved on the rotating shaft 31, the driving gear 32 is engaged with the driven gear 33, the driven gear 34 is sleeved on the output shaft 2, the front end of the output shaft 2 is matched with the casing 1 through a second bearing 21, a needle bearing 22 is further arranged on the output shaft 2, after compressed air enters the casing, the driving gear is driven to rotate, and the output shaft can be driven to rotate through the matching of the driven gear;
a through hole 112 is formed in the front cover 11, one end of the output shaft 2 passes through the through hole 112 and extends to the outside of the front cover, a third sealing ring 23 is arranged at the position where the output shaft 2 is matched with the through hole 112, a drill rod sleeve 24 is arranged at the end part of the output shaft 2, the drill rod sleeve 24 is in threaded connection with the output shaft 2, and a gasket 25 is arranged in front of the drill rod sleeve 24 and the front cover 11;
the air flow from the pneumatic power device enters a silencing device and then is discharged to the outside, preferably, the lower part of the driven gear 33 is provided with an arc-shaped shield 35, the silencing device 7 is arranged in a cavity 36 formed by the arc-shaped shield 35 and the inner bottom of the machine shell 1, preferably, the upper end of the silencing device is provided with an arc-shaped structure matched with the arc-shaped shield, so that the upper end of the silencing device and the arc-shaped shield can be tightly attached; preferably, the front cover 11 is provided with a plurality of support pillars 113, one ends of the support pillars are arranged on the side wall of the front cover 11, and the other ends of the support pillars 113 can abut against the rear end splicing piece of the silencer, so that the silencer can be supported, the silencer can be effectively prevented from deforming due to the impact of air flow, and the stability of the silencer is further improved;
preferably, the first handle 5 is also provided with an oil injection device 9, the arrangement of the oil injection device 9 can ensure that the drilling machine is directly connected with the oil injector, an external complex oil injection system is omitted, the oil injection operation is greatly simplified, and the use convenience of the drilling machine is further improved; specifically, the oil injection device 9 includes a cavity 91, a threaded seat 92, an oil injector assembly and a duct 51, the cavity 91 is disposed on the first handle 5, the threaded seat 92 is communicated with the cavity 91, the oil injector assembly is matched with the threaded seat 92, specifically, the oil injector assembly includes an oil injector plug 931, an oil injector sleeve 932, a blind hole 933 and an oil injector pipe 934, the oil injector plug 931 is matched with the threaded seat 92, the oil injector sleeve 932 is disposed outside the upper end of the oil injector plug 931, the blind hole 933 is disposed in the oil injector plug 931, the bottom of the oil injector pipe 934 is matched with the blind hole 933, the duct 51 is disposed on the first handle 5, one end of the duct 51 is communicated with the blind hole 933, and the other end of the duct 51 is communicated with the open cavity 41; oil can enter the opening cavity through the oil injector assembly and the pore passage in sequence and enter the shell through the air inlet device to lubricate the pneumatic power device; the setting of this oiling device has changed the operation of current oiling, can make the rig directly link to each other with the grease squirt, need not to connect complicated oiling system in addition, has simplified the oiling operation, has improved work efficiency greatly.
The above detailed description of the embodiments of the present invention is only the preferred embodiments of the present invention, and the embodiments of the present invention should not be considered as limiting the scope of the present invention, and all the equivalent changes and improvements made in the application scope of the present invention should still belong to the scope of the present invention.
Claims (9)
1. The utility model provides a handheld rig with built-in silencing device of improved generation, includes casing (1), locate front cover (11) of casing (1) front end, locate back lid (12) of casing (1) rear end, part lie in output shaft (2) in casing (1), be used for driving output shaft (2) carry out pivoted pneumatic type power device, be used for introducing outside air intake device (4) in casing (1), locate exhaust hole (111) on front cover (11), locate first in command (5) of casing (1) one side, locate second in command (6) of casing (1) opposite side and locate silencing device (7) in casing (1), its characterized in that: the silencer (7) comprises a front end splicing piece (71), a rear end splicing piece (72), a plurality of splicing pieces A (73) arranged between the front end splicing piece (71) and the rear end splicing piece (72) and splicing pieces B (74) arranged between two adjacent splicing pieces A (73), wherein an air inlet hole (711) is formed in the upper part of the front end splicing piece (71), an air outlet hole (721) is formed in the lower part of the rear end splicing piece (72), and an upper-layer orifice-plate silencing chamber (75), a middle-layer corrugated silencing chamber (76) and a lower-layer orifice-plate silencing chamber (77) can be formed in the front end splicing piece (71), the rear end splicing piece (72), the splicing pieces A (73) and the splicing pieces B (74) after splicing; after air flow in the machine shell enters the silencing device through the air inlet hole (711), the air flow sequentially passes through the upper-layer pore plate silencing chamber (75), the middle-layer corrugated silencing chamber (76) and the lower-layer pore plate silencing chamber (77) for silencing, then is discharged out of the silencing device through the air outlet hole (721), and is discharged to the outside through the air outlet hole (111); the splicing piece A (73) and the splicing piece B (74) are matched through a splicing structure.
2. The hand-held drill with improved built-in acoustic abatement apparatus of claim 1, wherein: the splicing structure comprises a first plug connector (81), a second plug connector (82) and a third plug connector (83) which can be plugged between the first plug connector (81) and the second plug connector (82).
3. The hand-held drill with improved built-in acoustic abatement apparatus of claim 2, wherein: the first plug connector (81) comprises a first lower horizontal part (811), the second plug connector (82) comprises a second upper horizontal part (821), and the third plug connector (83) comprises a third upper horizontal part (831), a third lower horizontal part (832) and a first triangular protrusion (833) arranged on the lower surface of the third upper horizontal part (831); when the first plug connector (81), the second plug connector (82) and the third plug connector (83) are in plug fit with each other, the lower surface of the first lower horizontal part (811) is attached to the upper surface of the third upper horizontal part (831), and the upper surface of the second upper horizontal part (821) is attached to the lower surface of the third lower horizontal part (832).
4. A hand-held drill with improved built-in acoustic abatement apparatus according to claim 3, wherein: the middle part of the splicing piece A (73) is provided with a first strip-shaped through hole (731), the upper part of the splicing piece A is provided with a plurality of first silencing holes (732), and the lower part of the splicing piece A is provided with a plurality of second silencing holes (733); one side of the splicing piece A (73) is provided with the first plug connector (81) and the second plug connector (82), the first plug connector (81) is arranged at the corresponding position of the first silencing hole (732), and the second plug connector (82) is arranged at the corresponding position of the second silencing hole (733); and a third plug connector (83) is arranged on the other side of the splicing piece A (73), the third plug connector (83) is arranged at the position of the first strip-shaped through hole (731), and a second triangular protrusion (734) is arranged on the lower wall of the inner side of the first strip-shaped through hole (731).
5. The hand-held drill with improved built-in acoustic damping device of claim 4, wherein: a second strip-shaped through hole (741) is formed in the middle of the splicing piece B (74), a plurality of third silencing holes (742) are formed in the upper portion of the splicing piece B, a plurality of fourth silencing holes (743) are formed in the lower portion of the splicing piece B, the first plug connector (81) and the second plug connector (82) are arranged on one side of the splicing piece B (74), the first plug connector (81) is arranged at the position corresponding to the third silencing holes (742), and the second plug connector (82) is arranged at the position corresponding to the fourth silencing holes (743); and a third plug connector (83) is arranged on the other side of the splicing piece B (74), the third plug connector (83) is arranged at the position of the second strip-shaped through hole (741), and a third triangular protrusion (744) is arranged on the lower wall of the inner side of the second strip-shaped through hole (741).
6. The hand-held drill with improved built-in acoustic abatement apparatus of claim 5, wherein: when the splicing piece A (73) and the splicing piece B (74) are spliced and matched, the third silencing hole (742) and the first silencing hole (732) are arranged in a staggered mode, and the fourth silencing hole (743) and the second silencing hole (733) are arranged in a staggered mode.
7. A hand-held drill with an improved built-in silencer according to claim 4 or 6, characterised in that: a first plug connector (81) and a front end flow guide member (84) are arranged on one side of the front end splicing member (71), and the first plug connector (81) is arranged at the corresponding position of the air inlet hole (711); when the front end splicing piece is spliced and matched with the splicing piece A, the third splicing piece on the splicing piece A is inserted between the first splicing piece on the front end splicing piece and the front end flow guide piece, and the air inlet holes (711) on the front end splicing piece (71) and the first silencing holes (732) on the splicing piece A are arranged in a staggered mode.
8. The hand-held drill with improved built-in acoustic abatement apparatus of claim 7, wherein: a rear end flow guide member (85) is arranged on one side of the rear end splicing member (72); when the rear end splicing piece is spliced and matched with the splicing piece A, the rear end flow guide piece on the rear end splicing piece is inserted between the first splicing piece and the second splicing piece on the splicing piece A, and the position of the air outlet (721) on the rear end splicing piece and the position of the second silencing hole (733) on the splicing piece A are arranged in a staggered mode.
9. A hand-held drill with improved built-in acoustic damping device according to claim 1 or 8, characterised in that: and the front end splicing piece (71), the rear end splicing piece (72), the splicing piece A (73) and the splicing piece B (74) are spliced and then fixed through a bolt (78).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921273691.7U CN210768611U (en) | 2019-08-06 | 2019-08-06 | Handheld drilling machine with improved built-in silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921273691.7U CN210768611U (en) | 2019-08-06 | 2019-08-06 | Handheld drilling machine with improved built-in silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210768611U true CN210768611U (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921273691.7U Expired - Fee Related CN210768611U (en) | 2019-08-06 | 2019-08-06 | Handheld drilling machine with improved built-in silencer |
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| CN (1) | CN210768611U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410014A (en) * | 2019-08-06 | 2019-11-05 | 天津万德矿山机械有限公司 | A kind of hand-held drill with silencing means built in modified |
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2019
- 2019-08-06 CN CN201921273691.7U patent/CN210768611U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410014A (en) * | 2019-08-06 | 2019-11-05 | 天津万德矿山机械有限公司 | A kind of hand-held drill with silencing means built in modified |
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