CN206794832U - A kind of drilling holes on connecting rods system - Google Patents
A kind of drilling holes on connecting rods system Download PDFInfo
- Publication number
- CN206794832U CN206794832U CN201720518890.4U CN201720518890U CN206794832U CN 206794832 U CN206794832 U CN 206794832U CN 201720518890 U CN201720518890 U CN 201720518890U CN 206794832 U CN206794832 U CN 206794832U
- Authority
- CN
- China
- Prior art keywords
- drill bit
- unit head
- oil
- connecting rods
- rotating shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Earth Drilling (AREA)
- Drilling And Boring (AREA)
Abstract
The utility model discloses a kind of drilling holes on connecting rods system, and it includes boring machine, hydraulic oil unit, sedimentation basin and positioner；Described boring machine includes unit head and drill bit, and the rotating shaft of described unit head and drill bit are equipped with centre bore, and described drill bit is detachably attached to the rotating shaft of unit head and the centre bore of the rotating shaft of unit head is connected with the centre bore of drill bit；Described positioner includes fixed station, collection table, collecting tank and fixture；The utility model not only solves the problems, such as the chip removal of long oilhole, moreover it is possible to prevents Drill Crack, it is also disposably to complete to bore long oilhole, will not produce step, improves production efficiency and ensure that product quality, and automaticity is high；The program may be used on advanced automobile engine component technical field.
Description
Technical field
It the utility model is related to advanced automobile engine component technical field, and in particular to a kind of drilling holes on connecting rods system.
Background technology
Connecting rod is one of primary drive part in automobile engine, and it is in diesel engine, the swollen of effect piston-top surface
Swollen pressure transmission to bent axle, and by bent axle driving and with the gas in piston compression cylinder.In the production process of connecting rod,
Hole machined accounts for the 2/3 of its processing total amount, and in general connecting rod needs to complete the processing in 4 holes and 4 faces, wherein connecting big end hole
Long machining of oil hole with small head bore is a technological difficulties.
At present, in the production process of connecting rod, mode that people process long oilhole be by plain radial drilling machine equipment come
Processing, what plain radial drilling machine equipment used is usually common drill bit, but because long oil hole is very long, in the process of drilling
In easily chip removal it is not smooth, hinder drilling be normally carried out, cause damp production, sometimes continuous firing too long, temperature of diamond bit rise,
Easily cause Drill Crack.Thus people often bore in four times in drilling, i.e., once bore a quarter, then drill bit is exited row
Bits, are then drilled next time again, and not only efficiency is very low for this, and after drill bit exits, due to mechanical oscillation or positioning
Not precisely, dislocation is often produced between drill bit and long oilhole, makes to produce step inside long oilhole, and then influence quality.Therefore, it is existing
Some processing modes can not meet the needs of people.
Utility model content
In view of the above problems, it is necessary to which a kind of technical scheme that can be tackled is provided.
The purpose of this utility model is to provide a kind of drilling holes on connecting rods system, and it not only solves the chip removal of long oilhole and asked
Topic, moreover it is possible to prevent Drill Crack, it is also disposably to complete to bore long oilhole, will not produce step, improve production efficiency and guarantee
Product quality, and automaticity is high.
What the utility model was realized in：
A kind of drilling holes on connecting rods system, it includes：
Boring machine, it includes unit head and drill bit, and the rotating shaft of described unit head and drill bit are equipped with centre bore, described brill
Head is detachably attached to the rotating shaft of unit head and the centre bore of the rotating shaft of unit head is connected with the centre bore of drill bit；
Hydraulic oil unit, it is provided with flowline and oil inlet pipe, and its flowline is connected to the centre bore of the rotating shaft of unit head；
Sedimentation basin, its oil-out are connected to the oil inlet pipe of hydraulic oil unit；
And positioner, it is installed on boring machine, and its oil-out is connected to sedimentation basin, and the centre bore of drill bit is fuel-displaced
Mouth is on positioner.
As further explanation of the present utility model, described positioner includes：
Fixed station, it is fixed on boring machine；
Collection table, it is fixed on fixed station；
Collecting tank, it is fixed in collection table, for collecting and filtering hydraulic oil；
And fixture, it is fixed in collection table, for positioning and fastening processed product.
As further explanation of the present utility model, the side of the bottom land of described collecting tank is provided with an oil-out, should
Oil-out is provided with screen pack, and the opposite side of the bottom land of collecting tank tilts towards the side of oil-out.
As further explanation of the present utility model, described collecting tank is provided with one close to a side of unit head to be determined
Position hole, the diameter of the positioning hole is consistent with the diameter of drill bit, and side of the collecting tank away from unit head is provided with a chip-removal hole, the row
The diameter for considering hole to be worth doing is more than the diameter of drill bit, and the positioning hole and the chip-removal hole are in a straight line with drill bit, energy when drill bit moves forward
Enough sequentially pass through the positioning hole and the chip-removal hole.
As further explanation of the present utility model, being shaped as the section of described collecting tank is U-shaped.
As further explanation of the present utility model, described fixture is provided with alignment pin, the cross section of described alignment pin
It is consistent with the diameter of the small head bore of connecting rod fixed on fixture for cylinder, the diameter of its cross section.
As further explanation of the present utility model, the side of described alignment pin hollows out a breach towards drill bit,
The breach and drill bit be in one directly on, and the diameter of the breach is more than the diameter of drill bit.
As further explanation of the present utility model, described boring machine also includes base and the lathe on base is set
It is standby；
Described base includes workbench and control cabinet, and control cabinet is arranged on workbench side, is internally provided with numerical control system
System；
Described machine tool includes slide unit, feeding motor and screw mandrel, described feeding motor and is installed to slide unit side, institute
The screw mandrel stated is detachably attached to the rotating shaft of feeding motor and is connected with the support base of unit head, the support of described unit head
Seat is slidably mounted on slide unit；Described digital control system has signal wire to be connected with feeding motor and unit head.
The beneficial effect that the utility model possesses：
1st, hydraulic oil is continuously sent to the centre bore of the rotating shaft of unit head by the hydraulic oil unit that the utility model is provided with a steady stream,
And then hydraulic oil can enter machining area by the centre bore of drill bit, and then the heat of machining area is absorbed, and by heat band
Go out machining area, so as to which the temperature of drill bit be reduced, in this way, can effectively prevent drill bit from becoming because of the too high performance in processing of temperature
Difference so be easily broken off.
2nd, effectively iron filings caused by drilling can also be lubricated, promoted while the utility model is cooled using hydraulic oil
Enter the discharge of iron filings, prevent drill bit is stuck from turn resulting in damp production, therefore can disposably complete to drill, improve production
Efficiency.
3rd, collecting tank 7 of the present utility model is provided with positioning hole, and the diameter of the positioning hole is consistent with the diameter of drill bit 14, therefore
The resonance amplitude caused by vibration equipment in drilling can be reduced, ensure that the borehole accuracy of drill bit 14, and then ensure product
Quality.
4th, alignment pin of the present utility model is provided with breach, can give the buffering area of drill bit advance, be advantageous to drill bit and liquid
Iron filings are promoted breach by force feed, can effectively prevent iron filings from following drill bit to retract in long oilhole.
5th, the bottom land of collecting tank of the present utility model tilts to oil-out, and the oil-out is provided with screen pack, can be effective
Hydraulic oil and iron filings are separated, meanwhile, the section of collecting tank is set to U-shaped structure, is advantageous to staff and clears up receipts with spades
Collect groove 7, improve operating efficiency.
6th, the hydraulic oil of the present embodiment can recycle in drilling, not only save production cost and also avoid to environment
Pollution.
Brief description of the drawings
Fig. 1 is that the structure of embodiment of the present utility model connects top view；
Fig. 2 is that the structure of embodiment of the present utility model connects front view；
Fig. 3 is the top view of the positioner of embodiment of the present utility model；
Fig. 4 is the main view sectional view of the positioner of embodiment of the present utility model；
Fig. 5 is the main view sectional view of the alignment pin of embodiment of the present utility model；
Marked in figure：1st, boring machine；2nd, hydraulic oil unit；3rd, positioner；4th, sedimentation basin；5th, fixed station；6th, collection table；7th, receive
Collect groove；8th, fixture；9th, alignment pin；10th, connecting rod；11st, base；12nd, machine tool；13rd, unit head；14th, drill bit.
Embodiment
The utility model is further illustrated with reference to the accompanying drawings and examples, but the scope of protection of the utility model is not
It is confined to following examples.
Embodiment：
As depicted in figs. 1 and 2, a kind of drilling holes on connecting rods system, it includes：
Boring machine 1, it includes unit head 13 and drill bit 14, and the rotating shaft of described unit head 13 and drill bit 14 are equipped with center
Hole, described drill bit 14 are detachably attached in the rotating shaft of unit head 13 and the centre bore and drill bit 14 of the rotating shaft of unit head 13
Heart hole is connected；
Hydraulic oil unit 2, it is provided with flowline and oil inlet pipe, and its flowline is connected to the centre bore of the rotating shaft of unit head 13；
Sedimentation basin 4, its oil-out are connected to the oil inlet pipe of hydraulic oil unit 2；
And positioner 3, it is installed on boring machine 1, and its oil-out is connected to sedimentation basin 4, and the centre bore of drill bit 14
Oil-out on the positioner 3.
In above-described embodiment, hydraulic oil is continuously sent to the centre bore of the rotating shaft of unit head 13 by hydraulic oil unit 2 in a steady stream, enters
And hydraulic oil can enter the machining area of connecting rod 10 by the centre bore of drill bit 14, so absorb connecting rod 10 and drill bit 14 plus
The heat in work area domain, and take heat out of machining area, so as to which the temperature of drill bit 14 be reduced, in this way, can effectively prevent from boring
First 14 degradation and then are easily broken off because temperature is too high in processing；Simultaneously as the lubrication of hydraulic oil, can be effective
Ground iron filings will lubricate caused by drilling, promote the discharge of iron filings, prevent that drill bit 14 is stuck and in turn result in damp production, therefore
It can disposably complete to drill, improve production efficiency.
As shown in Figure 3, Figure 4, the further explanation as the present embodiment, described positioner 3 include：
Fixed station 5, it is fixed on boring machine 1；
Collection table 6, it is fixed on fixed station 5；
Collecting tank 7, it is fixed in collection table 6, for collecting and filtering hydraulic oil；
And fixture 8, it is fixed in collection table 6, for positioning and fastening processed product.
As shown in figure 3, the further explanation as the present embodiment, the side of the bottom land of described collecting tank 7 is provided with one
Oil-out, the oil-out are provided with screen pack, and the opposite side of the bottom land of collecting tank 7 tilts towards the side of oil-out.In the present embodiment
Collecting tank 7 use this inclined bottom surface, hydraulic oil can be collected automatically, and the screen pack in exit can be to collecting tank
Hydraulic oil inside 7 is filtered, simple in construction and practical.
As shown in figure 4, as further explanation of the present utility model, one close to unit head 13 of described collecting tank 7
Side is provided with a positioning hole, and the diameter of the positioning hole is consistent with the diameter of drill bit 14, in the present embodiment, due to boring long oilhole
The length of drill bit 14 needs to reach more than 20cm, and when drill bit 14 drills, positioning hole can be reduced shakes caused by vibration equipment
Width, the borehole accuracy of drill bit 14 is ensure that, and then ensure the quality of product；Side of the collecting tank 7 away from unit head 13 is provided with one
Individual chip-removal hole, the oil-out of collection table 6 communicate with the chip-removal hole, and the diameter of the chip-removal hole is more than the diameter of drill bit 14, the positioning
Hole and the chip-removal hole are in a straight line with drill bit 14, and drill bit 14 can sequentially pass through the positioning hole and the chip removal when moving forward
Hole, in the present embodiment, screw thread of the drill bit 14 in drilling on drill bit 14 automatically discharge iron filings from screw thread, and this is known normal
Know, therefore iron filings will be discharged to chip-removal hole by drill bit 14, be advantageous to the collection of iron filings and hydraulic oil, and the oil-out of collection table 6
Communicated with the chip-removal hole, this is also beneficial to hydraulic oil and is discharged into collecting tank 7 from chip-removal hole.
As shown in figure 4, the further explanation as the present embodiment, being shaped as the section of described collecting tank 7 is U-shaped, this
The collecting tank 7 of embodiment is advantageous to staff using the structure and clears up collecting tank 7 with spades, improves operating efficiency.
As shown in figure 4, the further explanation as the present embodiment, described fixture 8 is provided with alignment pin 9, described positioning
Pin 9 is in side of the fixture 8 away from collecting tank 7, and its cross section is solid in the diameter and fixture 8 of its cross section to be cylindrical
The diameter of the small head bore of fixed connecting rod 10 is consistent, can so be accurately positioned small head bore.
Further explanation as the present embodiment as shown in Figure 5, the side of described alignment pin 9 hollows out one towards drill bit
14 breach, the breach and drill bit 14 be in one directly on, and the diameter of the breach is more than the diameter of drill bit 14.The present embodiment
In, the breach that alignment pin 9 is provided with can give the buffering area of the advance of drill bit 14, be advantageous to drill bit 14 and hydraulic oil promotes iron filings
Breach, it can effectively prevent iron filings from following drill bit 14 to retract in long oilhole.
As the further explanation of the present embodiment, described boring machine 1 also includes the machine of base 11 and installation on the pedestal 11
Bed apparatus 12；
Described base includes workbench and control cabinet, and control cabinet is arranged on workbench side, is internally provided with numerical control system
System；
Described machine tool 12 includes slide unit, feeding motor and screw mandrel, described feeding motor and is installed to slide unit side,
Described screw mandrel is detachably attached to the rotating shaft of feeding motor and is connected with the support base of unit head 13, described unit head 13
Support base be slidably mounted on slide unit；Described digital control system has signal wire to be connected with feeding motor and unit head 13.
Boring machine 1 in the present embodiment, should using the T60 numerical control Boring Machine Tools of Shandong Qi Da Machine Manufactures Co., Ltd manufacture
T60 numerical control Boring Machine Tools have been techniques knowns, and the present embodiment is by the rotating shaft of the unit head 13 of the boring machine 1 and drill bit
14 respectively separately process a centre bore.
The present embodiment try out in engine link production the course of work it is as follows：
Rigging up and debugging is good, connecting rod 10 is fixed on fixture 8, starts hydraulic oil unit 2, hydraulic oil unit 2 extracts heavy
Hydraulic oil in shallow lake pond 4 delivers to the centre bore of the rotating shaft of unit head 13, is sent hydraulic oil by the centre bore of the rotating shaft of unit head 13
The other end oil-out of the centre bore of past drill bit 14 and the centre bore through drill bit 14 flows into collecting tank 7, and hydraulic oil passes through collecting tank 7
Filter screen filtration after from the oil-out of collecting tank 7 to flow into sedimentation basin 4 to be extracted；Then, the operation that digital control system carries is pressed
Start button in panel, digital control system sending and receiving go out the advancement commands to prestore and referred to feeding motor, feeding motor according to the advance
Order rotation, and then screw mandrel rotation is driven, so as to drive the support base of unit head 13 to move ahead by screw mandrel, finally controlled by unit head 13
Drill bit 14 moves ahead；Meanwhile digital control system sending and receiving go out the Machining Instruction to prestore to unit head 13, unit head 13 is according to the Machining Instruction
Control its rotating shaft to start to rotate, and then drive drill bit 14 to be drilled；
Because drill bit 14 can produce heat in boring procedure, and hydraulic oil absorbs brill when flowing through the centre bore of drill bit 14
First 14 heat, after the oil-out of the centre bore of hydraulic oil outflow drill bit 14, hydraulic oil is between drill bit 14 and connecting rod 10
Flowed out in gap, now hydraulic oil absorbs the heat of drill bit 14 and connecting rod 10, therefore can effectively prevent drill bit 14 because of temperature mistake
The high degradation in processing and then it is easily broken off；
After the completion of long machining of oil hole, digital control system sending and receiving go out the halt instruction to prestore and pressed to feeding motor, feeding motor
Stopped the rotation according to the halt instruction, and then drive screw mandrel to stop the rotation, so as to drive the support base of unit head 13 to stop by screw mandrel
Move ahead, finally control drill bit 14 to stop moving ahead by unit head 13；After 2 seconds, digital control system sending and receiving go out the retrogressing instruction to prestore to entering
To motor, feeding motor instructs according to the retrogressing to be rotated, and then drives screw mandrel rotation, so as to drive the branch of unit head 13 by screw mandrel
Support seat to retreat, finally control drill bit 14 to retreat by unit head 13；After 5 seconds, digital control system sending and receiving go out the halt instruction that prestores to entering
To motor, feeding motor stops the rotation according to the halt instruction, and then drives screw mandrel to stop the rotation, so as to drive power by screw mandrel
First 13 support base stops retreating, and finally controls drill bit 14 to stop retreating by unit head 13, meanwhile, digital control system sending and receiving go out to prestore
Stopping Machining Instruction to unit head 13, unit head 13 controls its rotating shaft to stop the rotation according to the stopping Machining Instruction, and then band
Dynamic drill bit 14 stops drilling；Now, staff can use lower link 10 and load onto product progress next round production to be processed, or
The power supply for disconnecting hydraulic oil unit 2 stops extracting hydraulic oil production.
Finally it should be noted that：The utility model is the foregoing is only to try out in the preferred embodiment of engine link production
, the utility model can also equally be used in the production technology of near field, therefore above-described embodiment is not limited to this
The protection domain of utility model, although the utility model is described in detail with reference to above-described embodiment, for this area
Technical staff for, it can still modify to the technical scheme described in foregoing embodiments, or to its middle part
Technical characteristic is divided to carry out equivalent substitution.All any modifications within the spirit and principles of the utility model, made, equally replace
Change, improve, should be included within the scope of protection of the utility model.
Claims (8)
- A kind of 1. drilling holes on connecting rods system, it is characterised in that including：Boring machine (1), it includes unit head (13) and drill bit (14), and the rotating shaft of described unit head (13) and drill bit (14) are equipped with Centre bore, described drill bit (14) be detachably attached to the rotating shaft of unit head (13) and the centre bore of the rotating shaft of unit head (13) and The centre bore of drill bit (14) is connected；Hydraulic oil unit (2), it is provided with flowline and oil inlet pipe, and its flowline is connected to the centre bore of the rotating shaft of unit head (13)；Sedimentation basin (4), its oil-out are connected to the oil inlet pipe of hydraulic oil unit (2)；And positioner (3), it is installed on boring machine (1), and its oil-out is connected to sedimentation basin (4), and in drill bit (14) The oil-out in heart hole is on positioner (3).
- 2. a kind of drilling holes on connecting rods system according to claim 1, it is characterised in that described positioner (3) includes：Fixed station (5), it is fixed on boring machine (1)；Collection table (6), it is fixed on fixed station (5)；Collecting tank (7), it is fixed in collection table (6), for collecting and filtering hydraulic oil；And fixture (8), it is fixed in collection table (6), for positioning and fastening processed product.
- A kind of 3. drilling holes on connecting rods system according to claim 2, it is characterised in that：The bottom land of described collecting tank (7) Side is provided with an oil-out, and the oil-out is provided with screen pack, the inclination of the opposite side of the bottom land of collecting tank (7) towards oil-out Tiltedly.
- A kind of 4. drilling holes on connecting rods system according to claim 3, it is characterised in that：Described collecting tank (7) is close to power One side of head (13) is provided with a positioning hole, and the diameter of the positioning hole is consistent with the diameter of drill bit (14), and collecting tank (7) is remote Side from unit head (13) is provided with a chip-removal hole, and the diameter of the chip-removal hole is more than the diameter of drill bit (14), the positioning hole and The chip-removal hole is in a straight line with drill bit (14), and drill bit (14) can sequentially pass through the positioning hole and the chip removal when moving forward Hole.
- A kind of 5. drilling holes on connecting rods system according to claim 4, it is characterised in that：The section of described collecting tank (7) It is shaped as U-shaped.
- A kind of 6. drilling holes on connecting rods system according to claim 2, it is characterised in that：Described fixture (8) is provided with alignment pin (9), the cross section of described alignment pin (9) is cylinder, the diameter of its cross section and the connecting rod fixed on fixture (8) (10) diameter of small head bore is consistent.
- A kind of 7. drilling holes on connecting rods system according to claim 6, it is characterised in that：The side of described alignment pin (9) is dug An empty breach towards drill bit (14), the breach and drill bit (14) be in one directly on, and the diameter of the breach is more than and bored The diameter of head (14).
- A kind of 8. drilling holes on connecting rods system according to claim 1, it is characterised in that：Described boring machine (1) also includes base (11) machine tool (12) and on base (11)；Described base includes workbench and control cabinet, and control cabinet is arranged on workbench side, is internally provided with digital control system；Described machine tool (12) includes slide unit, feeding motor and screw mandrel, described feeding motor and is installed to slide unit side, institute The screw mandrel stated is detachably attached to the rotating shaft of feeding motor and is connected with the support base of unit head (13), described unit head (13) support base is slidably mounted on slide unit；Described digital control system has signal wire company with feeding motor and unit head (13) Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720518890.4U CN206794832U (en) | 2017-05-11 | 2017-05-11 | A kind of drilling holes on connecting rods system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720518890.4U CN206794832U (en) | 2017-05-11 | 2017-05-11 | A kind of drilling holes on connecting rods system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206794832U true CN206794832U (en) | 2017-12-26 |
Family
ID=60740676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720518890.4U Expired - Fee Related CN206794832U (en) | 2017-05-11 | 2017-05-11 | A kind of drilling holes on connecting rods system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206794832U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110090987A (en) * | 2019-06-03 | 2019-08-06 | 舟山嘉程机械有限公司 | The processing unit (plant) of oilhole in gonnecting rod body |
-
2017
- 2017-05-11 CN CN201720518890.4U patent/CN206794832U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110090987A (en) * | 2019-06-03 | 2019-08-06 | 舟山嘉程机械有限公司 | The processing unit (plant) of oilhole in gonnecting rod body |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206047663U (en) | A kind of handware machining drilling machine | |
| CN102554623B (en) | Metal-cutting machine tool for automatically machining steel reinforcement connection sleeve | |
| CN203853587U (en) | Plate-type round component two-coordinate BTA (boring and trepanning association) vibrating deep-hole drilling device | |
| CN1079308C (en) | Processing method of superlong precision deep bore and its equipment | |
| CN111577163B (en) | Double-reverse-circulation continuous deslagging drilling tool | |
| CN107900683B (en) | Aircraft fastener hole process equipment | |
| CN104912491A (en) | Automatic-rotating rapid dismounting and mounting type spiral drill rod | |
| CN203426493U (en) | Deep-hole drilling equipment | |
| CN106271635B (en) | Full circle swinging automatic position machining device and method of the crankshaft-flywheel with drill reaming | |
| CN206794832U (en) | A kind of drilling holes on connecting rods system | |
| CN210702648U (en) | Machining is with drilling equipment that drilling effect is good | |
| CN104439386A (en) | Machining device for inclined small-diameter long hole | |
| CN2712515Y (en) | Water supply ring for internal cooling taper shank twist drill | |
| CN218224759U (en) | Liquid pipeline drilling device with pressure | |
| CN204504288U (en) | A kind of boring cutting thread one lathe | |
| CN201644854U (en) | Chip removing and deep-hole processing device in novel milling and boring machine | |
| CN206316386U (en) | Large aperture jacking device | |
| CN207057657U (en) | A kind of high lubricity puncher for preventing crumb loading | |
| CN207508339U (en) | Convenient for cooling down chip removal type long-hole boring apparatus | |
| CN207309005U (en) | Metalworking line apparatus for automatically removing burr | |
| CN215468303U (en) | Power switching device on drilling machine | |
| CN113006697A (en) | Mechanical hydraulic eccentric rotary positioning device | |
| CN207840213U (en) | A kind of rotary connector suitable for lathe deep hole machining | |
| CN110125450A (en) | A kind of pressure pipeline punching device under pressure | |
| CN216065875U (en) | Thread drill bit convenient for injecting cutting fluid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171226 Termination date: 20210511 |