CN102794625A - Hydraulic vibration pull pin device - Google Patents
Hydraulic vibration pull pin device Download PDFInfo
- Publication number
- CN102794625A CN102794625A CN2012102855734A CN201210285573A CN102794625A CN 102794625 A CN102794625 A CN 102794625A CN 2012102855734 A CN2012102855734 A CN 2012102855734A CN 201210285573 A CN201210285573 A CN 201210285573A CN 102794625 A CN102794625 A CN 102794625A
- Authority
- CN
- China
- Prior art keywords
- oil
- working hole
- return opening
- cylinder
- arc groove
- 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.)
- Granted
Links
Images
Landscapes
- Actuator (AREA)
Abstract
The invention relates to a pull pin device, in particular to a hydraulic vibration pull pin device, and solves the problem of shortage of a special tool for drawing a pin from a mine car body. The hydraulic vibration pull pin device comprises a motor (1), a cock type reversing valve (2), a single rod discharge piston oil cylinder (3), a dual rod discharge piston oil cylinder (4) and a support piece (5), wherein the cock type reversing valve (2) comprises a valve body (20), a cylindrical valve sleeve (21) arranged in the valve body, and a valve core (22) arranged in the valve sleeve (21); a main body of the valve core (22) is a cylinder having a clearance fit with the valve sleeve (21), and first, second and third arc-shaped grooves (100, 200, 300) with arc shapes of inferior arcs are arranged on the upper part of a horizontal axis surface of the cylinder of the valve core (22) from one end to the other end in sequence. The hydraulic vibration pull pin device, provided by the invention, has the advantages of simple structure, reasonable design, convenience for use, and capability of greatly improving the production efficiency.
Description
Technical field
The present invention relates to pin pulling out device, be specially a kind of hydraulic vibration pin pulling out device.
Background technology
The pin of mine car is as a kind of fastening connection piece; Insert on the body of mine car, in real work, often need pin be extracted from the body of mine car, but pin cooperates with body closely; Be not drawn out easily; At present lack a kind of instrument that pin is extracted from the mine car body that is specifically designed to again, therefore, be necessary to invent a kind of novel pin pulling out device.
Summary of the invention
The present invention provides a kind of hydraulic vibration pin pulling out device in order to solve a kind of problem of extracting the instrument of pin from the mine car body that is exclusively used in of present shortage.
The present invention adopts following technical scheme to realize:
A kind of hydraulic vibration pin pulling out device comprises motor, stopcock formula reversal valve, single rod piston oil-cylinder, two rod piston oil-cylinder, support member.
Said stopcock formula reversal valve comprises valve body, places in the said valve body, valve pocket cylindraceous and place the spool in the said valve pocket; The body of said spool is and the cylinder of said valve pocket matched in clearance that the top of the cylindrical horizontal axial plane of spool passes through and is provided with first, second and third arc groove that arc is a minor arc successively; The bottom of the cylindrical horizontal axial plane of spool passes through and is provided with fourth, fifth, six arc grooves that arc is a minor arc successively; Said first, second, third and fourth, five, six arc grooves all about the cylindrical vertical axis of crossing axis of spool in the face of claiming; Each arc groove of the upper face of the horizontal axial plane of cylinder of spool and each arc groove of lower surface spatially position intersect each other that (promptly the spacer between the spacer between first arc groove and second arc groove and second arc groove and the 3rd arc groove spatially places respectively in the axial width scope of the 5th arc groove and the 6th arc groove; Correspondingly, the spacer between spacer between the 4th arc groove and the 5th arc groove and the 5th arc groove and the 6th arc groove spatially places respectively in the axial width scope of first arc groove and second arc groove); Said valve pocket passes through to connect successively on the same bus on its surface and has the oil return opening O of the center of circle on said bus
1, working hole A, oil inlet P, working hole B, oil return opening O
2Said oil return opening O
1, working hole A, oil inlet P, working hole B, oil return opening O
2Mutual alignment should guarantee that spool rotates in valve pocket the time, the 6th arc groove is with working hole B and oil return opening O
2UNICOM, the 5th arc groove are with oil inlet P and working hole A UNICOM, the 4th arc groove and oil return opening O
1UNICOM; The 3rd arc groove and oil return opening O
2UNICOM, second arc groove with oil inlet P and working hole B UNICOM, first arc groove with working hole A and oil return opening O
1UNICOM; The outer wall of said valve pocket cooperates with the inwall of said valve body and is fixedly connected; Run through on the said valve body have with valve pocket on corresponding respectively oil-in p, working hole a, the working hole b of oil inlet P, working hole A, working hole B; Also run through having oil return opening O on the valve body, the groove of said oil return opening O through valve interior wall respectively with the oil return opening O of valve pocket
1, oil return opening O
2UNICOM.
One end face of said spool is provided with perpendicular shaft extension; Said shaft extension is connected with the output shaft of said motor.
The working hole a of said stopcock formula reversal valve, working hole b are connected with two hydraulic fluid ports of said single rod piston oil-cylinder respectively, and the piston rod of said single rod piston oil-cylinder is connected with a piston rod of said pair of rod piston oil-cylinder.
Said support member comprises that one has the gripper shoe in hole; Said gripper shoe one side is connected with the cylinder body of said pair of rod piston oil-cylinder; The end face that another piston rod of said pair of rod piston oil-cylinder passes hole and the piston rod of said gripper shoe has the screw rod of screw thread through screw thread and two ends a end is connected (other end of screw rod is threaded with outside pin); The another side of said gripper shoe is evenly equipped with screw; Be connected with screw rod (when pulling pin, the end face of screw rod is resisted against the surface of external engine body) in the said screw.
During work; The working hole a of stopcock formula reversal valve (being two-position four-way valve) and working hole b are connected with the hydraulic fluid port of the rodless cavity of single rod piston oil-cylinder and rod chamber respectively that (perhaps annexation is exchanged and also can; Principle is the same); Oil-in p is connected oil return opening O and external fuel tank UNICOM with outside oil supply system.
During concrete work, the motor-driven valve core rotates in valve pocket, and when spool rotated to first working position (last half-turn as shown in Figure 4), the 6th arc groove was with working hole B on the valve pocket and oil return opening O
2UNICOM, the 5th arc groove are with the oil return opening O on the oil inlet P on the valve pocket and working hole A UNICOM, the 4th arc groove and the valve pocket
1UNICOM; So correspondingly; The oil-in p of fluid on valve body, the rodless cavity that working hole a gets into single rod piston oil-cylinder of outside oil supply system; Working hole b, the oil return opening O of fluid on valve body in the rod chamber of single rod piston oil-cylinder passes back into external fuel tank, and then the piston that promotes in single rod piston oil-cylinder moves to rod chamber.When spool rotates to second working position (lower branch as shown in Figure 5), the oil return opening O on the 3rd arc groove and the valve pocket
2UNICOM, second arc groove with the oil inlet P on the valve pocket and working hole B UNICOM, first arc groove with working hole A on the valve pocket and oil return opening O
1UNICOM; So correspondingly; The oil-in p of fluid on valve body, the rod chamber that working hole b gets into single rod piston oil-cylinder of outside oil supply system; Working hole a, the oil return opening O of fluid on valve body in the rodless cavity of single rod piston oil-cylinder passes back into external fuel tank, and then the piston that promotes in single rod piston oil-cylinder moves to rodless cavity.That is, when spool rotates a circle, realize switching-over once in valve pocket.In addition, the rotary speed of motor is per minute about 1,000 times, and is corresponding; The spool per minute also rotates about 1,000 times in valve pocket; So, because the switching-over effect of stopcock formula reversal valve, the piston of single rod piston oil-cylinder also can move back and forth about 1,000 times by per minute; And then small size double vibrations is provided, this vibration is delivered on the pin that need extract through the piston rod of two rod piston oil-cylinders.Then; A hydraulic fluid port oil-feed of two rod piston oil-cylinders, another hydraulic fluid port are fuel-displaced; Make the piston of two rod piston oil-cylinders move backward (away from the direction of pin); Like this, under the acting in conjunction of the vibration of the pulling force of two rod piston oil-cylinders and single rod piston oil-cylinder, pin is extracted from the mine car body.
Based on said process, through mechanical force pin is extracted from the mine car body apace, not only time saving and energy saving, and reduced labour intensity, improved production efficiency greatly.
The present invention is simple in structure, reasonable in design, and is easy to use, efficiently solves a kind of problem of extracting the instrument of pin from the mine car body that is exclusively used in of present shortage.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the assembly structure sketch map of valve pocket and spool in the stopcock formula reversal valve.
Fig. 3 is the right view of Fig. 2.
Fig. 4 is the E-E cutaway view of the spool of Fig. 2 when rotating to first working position.
Fig. 5 is the E-E cutaway view of the spool of Fig. 2 when rotating to second working position.
Fig. 6 is the F-F cutaway view of Fig. 4.
Fig. 7 is the structural representation of valve body in the stopcock formula reversal valve.
Among the figure, 1-motor, 2-stopcock formula reversal valve, the single rod piston oil-cylinder of 3-, the two rod piston oil-cylinders of 4-; The 5-support member, 10-pin, 11-body, 20-valve body, 21-valve pocket; The 22-spool, 23-shaft extension, 100-first arc groove, 200-second arc groove; 300-the 3rd arc groove, 400-the 4th arc groove, 500-the 5th arc groove, 600-the 6th arc groove.
The specific embodiment
Below in conjunction with accompanying drawing specific embodiment of the present invention is elaborated.
As shown in Figure 1, a kind of hydraulic vibration pin pulling out device comprises motor 1, stopcock formula reversal valve 2, single rod piston oil-cylinder 3, two rod piston oil-cylinder 4, support member 5.
Said stopcock formula reversal valve 2 comprises valve body 20, places in the said valve body 20, valve pocket 21 cylindraceous and place the spool 22 in the said valve pocket 21.
Like Fig. 4,5, shown in 6; The body of said spool 22 is and the cylinder of said valve pocket 21 matched in clearance that the top of the cylindrical horizontal axial plane of spool 22 passes through and is provided with first, second and third arc groove 100,200,300 that arc is a minor arc successively; The bottom of the cylindrical horizontal axial plane of spool 22 passes through and is provided with fourth, fifth, six arc grooves 400,500,600 that arc is a minor arc successively; Said first, second, third and fourth, five, six arc grooves 100,200,300,400,500,600 all about the cylindrical vertical axis of crossing axis of spool 22 in the face of claiming; Each arc groove of the upper face of the horizontal axial plane of cylinder of spool 22 and each arc groove of lower surface spatially position intersect each other that (promptly the spacer between the spacer between first arc groove 100 and second arc groove 200 and second arc groove 200 and the 3rd arc groove 300 spatially places respectively in the axial width scope of the 5th arc groove 500 and the 6th arc groove 600; Correspondingly, the spacer between spacer between the 4th arc groove 400 and the 5th arc groove 500 and the 5th arc groove 500 and the 6th arc groove 600 spatially places respectively in the axial width scope of first arc groove 100 and second arc groove 200).
As shown in Figure 2, said valve pocket 21 passes through to connect successively on the same bus on its surface and has the oil return opening O of the center of circle on said bus
1, working hole A, oil inlet P, working hole B, oil return opening O
2In fact, the position of working hole A and working hole B can exchange, and function is the same; In like manner, oil return opening O
1With oil return opening O
2The position also can exchange, function is the same.
Like Fig. 4, shown in 5, said oil return opening O
1, working hole A, oil inlet P, working hole B, oil return opening O
2Mutual alignment should guarantee that spool 22 rotates in valve pocket 21 time, the 6th arc groove 600 is with working hole B and oil return opening O
2UNICOM, the 5th arc groove 500 are with oil inlet P and working hole A UNICOM, the 4th arc groove 400 and oil return opening O
1UNICOM; The 3rd arc groove 300 and oil return opening O
2UNICOM, second arc groove 200 with oil inlet P and working hole B UNICOM, first arc groove 100 with working hole A and oil return opening O
1UNICOM.
The outer wall of said valve pocket 21 cooperates with the inwall of said valve body 20 and is fixedly connected.
As shown in Figure 7; Run through on the said valve body 20 have with valve pocket 21 on corresponding respectively oil-in p, working hole a, the working hole b of oil inlet P, working hole A, working hole B; Also run through having oil return opening O on the valve body 20, the groove of said oil return opening O through valve body 20 inwalls respectively with the oil return opening O of valve pocket 21
1, oil return opening O
2UNICOM.
Like Fig. 2, shown in 3, an end face of said spool 22 is provided with perpendicular shaft extension 23; Said shaft extension 23 is connected with the output shaft of said motor 1.
As shown in Figure 1; The working hole a of said stopcock formula reversal valve 2, working hole b be connected with two hydraulic fluid ports of said single rod piston oil-cylinder 3 respectively (be working hole a, working hole b all can with single rod piston oil-cylinder on the hydraulic fluid port of rod chamber UNICOM or with the hydraulic fluid port UNICOM of rodless cavity UNICOM), the piston rod of said single rod piston oil-cylinder 3 is connected with a piston rod of said pair of rod piston oil-cylinder 4; Said support member 5 comprises that one has the gripper shoe in hole; Said gripper shoe one side is connected with the cylinder body of said pair of rod piston oil-cylinder 4; The end face that another piston rod of said pair of rod piston oil-cylinder 4 passes hole and the piston rod of said gripper shoe has the screw rod of screw thread through screw thread and two ends a end is connected;, the another side of said gripper shoe is evenly equipped with screw, is connected with screw rod in the said screw.
Preferably; In said stopcock formula reversal valve 2; Said first and second, the axial width of five, six arc grooves 100,200,500,600 equates; The axial wide of third and fourth arc groove 300,400 equates, and the axial width of first arc groove 100 is greater than the axial width of the 3rd arc groove 300.During practical implementation, the oil inlet P on the valve pocket 21 of stopcock formula reversal valve 2, working hole A, working hole B, oil return opening O
1, oil return opening O
2The center of circle on same straight line and diameter identical.Preferably, the diameter of the oil inlet P on the diameter of the oil-in p on the valve body 20, working hole a, working hole b, oil return opening O and the valve pocket 21 is identical; Oil return opening O can open the optional position on valve body 20, makes the oil return opening O on oil return opening O and the valve pocket 21 as long as can realize through the groove of valve body 20 inwalls
1, oil return opening O
2The function of UNICOM gets final product.
It (is that the piston rod of single rod piston oil-cylinder and the end face of the piston rod of pair rod piston oil-cylinders all have screw thread that one piston rod of the piston rod of said single rod piston oil-cylinder 3 and two rod piston oil-cylinders 4 can be connected through the screw rod that two ends have a screw thread; The screw rod connection that has screw thread then through two ends), also can connect through shaft coupling.Another piston rod of said pair of rod piston oil-cylinder 4 has screw thread through two ends screw rod is connected (promptly in the end face of pin, be processed with internal thread, the screw rod that has a screw thread through two ends then is connected with the piston rod of two rod piston oil-cylinders) with outside pin 10.The another side of said gripper shoe is evenly equipped with screw, is connected with screw rod in the said screw, and when pulling pin, the end face of screw rod directly perhaps is resisted against the surface of external engine body through liner.
Claims (5)
1. a hydraulic vibration pin pulling out device is characterized in that: comprise motor (1), stopcock formula reversal valve (2), single rod piston oil-cylinder (3), two rod piston oil-cylinder (4), support member (5);
Said stopcock formula reversal valve (2) comprises valve body (20), the spool (22) of place in the said valve body (20), valve pocket cylindraceous (21) is interior with placing said valve pocket (21); The body of said spool (22) is and the cylinder of said valve pocket (21) matched in clearance that the top of the cylindrical horizontal axial plane of spool (22) passes through and is provided with first, second and third arc groove that arc is a minor arc (100,200,300) successively; The bottom of the cylindrical horizontal axial plane of spool (22) passes through and is provided with fourth, fifth, six arc grooves (400,500,600) that arc is a minor arc successively; Said first, second, third and fourth, five, six arc grooves (100,200,300,400,500,600) all about the cylindrical vertical axis of crossing axis of spool (22) in the face of claiming; Each arc groove of the upper face of the horizontal axial plane of cylinder of spool (22) and each arc groove of lower surface spatially intersect the position each other; Said valve pocket (21) passes through to connect successively on the same bus on its surface and has the oil return opening O of the center of circle on said bus
1, working hole A, oil inlet P, working hole B, oil return opening O
2Said oil return opening O
1, working hole A, oil inlet P, working hole B, oil return opening O
2Mutual alignment should guarantee that spool (22) rotates in valve pocket (21) time, the 6th arc groove (600) is with working hole B and oil return opening O
2UNICOM, the 5th arc groove (500) are with oil inlet P and working hole A UNICOM, the 4th arc groove (400) and oil return opening O
1UNICOM; The 3rd arc groove (300) and oil return opening O
2UNICOM, second arc groove (200) with oil inlet P and working hole B UNICOM, first arc groove (100) with working hole A and oil return opening O
1UNICOM;
The outer wall of said valve pocket (21) cooperates with the inwall of said valve body (20) and is fixedly connected; Run through on the said valve body (20) have with valve pocket (21) on corresponding respectively oil-in p, working hole a, the working hole b of oil inlet P, working hole A, working hole B; Also run through having oil return opening O on the valve body (20), the groove of said oil return opening O through valve body (20) inwall respectively with the oil return opening O of valve pocket (21)
1, oil return opening O
2UNICOM;
One end face of said spool (22) is provided with perpendicular shaft extension (23); Said shaft extension (23) is connected with the output shaft of said motor (1);
The working hole a of said stopcock formula reversal valve (2), working hole b are connected with two hydraulic fluid ports of said single rod piston oil-cylinder (3) respectively, and the piston rod of said single rod piston oil-cylinder (3) is connected with a piston rod of said pair of rod piston oil-cylinder (4);
Said support member (5) comprises that one has the gripper shoe in hole; Said gripper shoe one side is connected with the cylinder body of said pair of rod piston oil-cylinder (4); The end face that another piston rod of said pair of rod piston oil-cylinder (4) passes hole and the piston rod of said gripper shoe has the screw rod of screw thread through screw thread and two ends a end is connected; The another side of said gripper shoe is evenly equipped with screw, is connected with screw rod in the said screw.
2. hydraulic vibration pin pulling out device according to claim 1; It is characterized in that: said first and second, the axial width of five, six arc grooves (100,200,500,600) equates; The axial wide of third and fourth arc groove (300,400) equates, and the axial width of first arc groove (100) is greater than the axial width of the 3rd arc groove (300).
3. hydraulic vibration pin pulling out device according to claim 1 and 2 is characterized in that: oil inlet P, working hole A, working hole B, oil return opening O on the valve pocket (21) of said stopcock formula reversal valve (2)
1, oil return opening O
2Diameter identical; The diameter of the oil inlet P on the diameter of the oil-in p on the valve body (20), working hole a, working hole b, oil return opening O and the valve pocket (21) is identical.
4. hydraulic vibration pin pulling out device according to claim 1 and 2 is characterized in that: the piston rod of said single rod piston oil-cylinder (3) is connected through the screw rod that two ends have screw thread with a piston rod of two rod piston oil-cylinders (4).
5. hydraulic vibration pin pulling out device according to claim 3 is characterized in that: the piston rod of said single rod piston oil-cylinder (3) is connected through the screw rod that two ends have screw thread with a piston rod of two rod piston oil-cylinders (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210285573.4A CN102794625B (en) | 2012-08-13 | 2012-08-13 | Hydraulic vibration pull pin device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210285573.4A CN102794625B (en) | 2012-08-13 | 2012-08-13 | Hydraulic vibration pull pin device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102794625A true CN102794625A (en) | 2012-11-28 |
| CN102794625B CN102794625B (en) | 2014-06-18 |
Family
ID=47194060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210285573.4A Expired - Fee Related CN102794625B (en) | 2012-08-13 | 2012-08-13 | Hydraulic vibration pull pin device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102794625B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05106609A (en) * | 1991-10-19 | 1993-04-27 | Mazda Motor Corp | Hydraulic control device |
| US5218990A (en) * | 1990-12-11 | 1993-06-15 | Mannesmann Rexroth Gmbh | Multiway valve with piston slide valve |
| CN2183466Y (en) * | 1993-11-26 | 1994-11-23 | 谢晓林 | Rotary valve |
| DE10052613A1 (en) * | 2000-10-24 | 2002-05-08 | Bosch Gmbh Robert | Pin pressing-in device includes device to induce vibrations in pin |
| CN2850803Y (en) * | 2005-12-30 | 2006-12-27 | 潘华 | Automatic pin-drawing machine |
| CN201120541Y (en) * | 2007-11-21 | 2008-09-24 | 石玉东 | Pumping unit horsehead pin extractor |
| CN101858373A (en) * | 2010-06-10 | 2010-10-13 | 浙江工业大学 | High-frequency electrohydraulic fluttering generator |
| CN202137564U (en) * | 2011-05-30 | 2012-02-08 | 泰安力博机电科技有限公司 | Rapping type pin pulling device |
| CN202726433U (en) * | 2012-08-13 | 2013-02-13 | 张耀庭 | Hydraulic vibration pin pulling device |
-
2012
- 2012-08-13 CN CN201210285573.4A patent/CN102794625B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5218990A (en) * | 1990-12-11 | 1993-06-15 | Mannesmann Rexroth Gmbh | Multiway valve with piston slide valve |
| JPH05106609A (en) * | 1991-10-19 | 1993-04-27 | Mazda Motor Corp | Hydraulic control device |
| CN2183466Y (en) * | 1993-11-26 | 1994-11-23 | 谢晓林 | Rotary valve |
| DE10052613A1 (en) * | 2000-10-24 | 2002-05-08 | Bosch Gmbh Robert | Pin pressing-in device includes device to induce vibrations in pin |
| CN2850803Y (en) * | 2005-12-30 | 2006-12-27 | 潘华 | Automatic pin-drawing machine |
| CN201120541Y (en) * | 2007-11-21 | 2008-09-24 | 石玉东 | Pumping unit horsehead pin extractor |
| CN101858373A (en) * | 2010-06-10 | 2010-10-13 | 浙江工业大学 | High-frequency electrohydraulic fluttering generator |
| CN202137564U (en) * | 2011-05-30 | 2012-02-08 | 泰安力博机电科技有限公司 | Rapping type pin pulling device |
| CN202726433U (en) * | 2012-08-13 | 2013-02-13 | 张耀庭 | Hydraulic vibration pin pulling device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102794625B (en) | 2014-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201818571U (en) | Hydraulic system controlling two oil cylinders to sequentially telescope | |
| CN105757015A (en) | Hydraulic driven type non-intermittent supercharging device | |
| CN202726433U (en) | Hydraulic vibration pin pulling device | |
| CN202937417U (en) | Oblique shaft type axial plunger pump/motor with novel-structure plunger | |
| CN202545414U (en) | Automatic concrete piston retreating buffer throttling device for pumping oil cylinder | |
| CN204239375U (en) | A kind of oil hydraulic cylinder stop valve installation and the oil hydraulic cylinder of this device is housed | |
| CN102794625B (en) | Hydraulic vibration pull pin device | |
| CN104154068B (en) | A kind of corner self-servo valve control annular cylinder | |
| CN203889960U (en) | Hydraulic system of telescopic boom of straight-arm-type lorry-mounted crane | |
| CN203679113U (en) | Integrated machine with cutting of steel bar and synchronous bending of double shaft heads | |
| CN204321572U (en) | Continuous rotation self-centering Hydraulic Clamping Mechanism and hydraulic control system thereof | |
| CN203272871U (en) | Fast stable reversing valve | |
| CN205823771U (en) | Lead to rotary reversing valve for 24 | |
| CN103133744A (en) | Electric reversing valve | |
| CN202579460U (en) | Hydraulic emergency operation module | |
| CN203636758U (en) | Scraping machine hydraulic coupling disassembly special tool | |
| CN201391503Y (en) | Hydraulic hoist oil cylinder | |
| CN216430581U (en) | Large-drift-diameter electric control servo reversing valve driven by single-action servo oil cylinder | |
| CN205128176U (en) | Drive mechanism for magnet separator | |
| CN205173110U (en) | Double -cylinder hydraulic pressure loading device | |
| CN202106235U (en) | Hydraulic control device of numerical control hydraulic lathe | |
| CN202628643U (en) | Improved multiple directional control valve of hydraulic equipment | |
| CN203098441U (en) | Reversing valve of concrete pump | |
| CN202768518U (en) | Combination type hydraulic cylinder with floating cylinder barrels | |
| CN204035690U (en) | A kind of interference bolts assemblies Pneumatic mechanical type puller system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20180813 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |