CN105328444A - Hydraulic stretching device - Google Patents
Hydraulic stretching device Download PDFInfo
- Publication number
- CN105328444A CN105328444A CN201510763447.9A CN201510763447A CN105328444A CN 105328444 A CN105328444 A CN 105328444A CN 201510763447 A CN201510763447 A CN 201510763447A CN 105328444 A CN105328444 A CN 105328444A
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- China
- Prior art keywords
- nut
- pilot hole
- hitch
- nut hitch
- guide finger
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/06—Screw or nut setting or loosening machines
- B23P19/067—Bolt tensioners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B29/00—Accessories
- B25B29/02—Bolt tensioners
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a hydraulic stretching device which comprises a hydraulic cylinder and a stretching nut. The cross section of a cylinder body of the hydraulic cylinder is annular, a cavity for one end of a bolt to be stretched to penetrate is defined by the cylinder body of the hydraulic cylinder, and the end face of a piston of the hydraulic cylinder forms an ejecting face. The stretching nut is composed of a first nut sleeve buckle and a second nut sleeve buckle. When the first nut sleeve buckle and the second nut sleeve buckle are locked together, an inner thread of the first nut sleeve buckle and an inner thread of the second nut sleeve buckle form an inner thread matched with an outer thread of the bolt together, and the end face, close to the hydraulic cylinder, of the stretching nut, is provided with a stress face matched with the ejecting face so that the stretching nut can move under the ejecting of the piston in the direction parallel to the axial direction of the hydraulic cylinder. The hydraulic stretching device achieves the technical purpose that the defects that the connection operation of a stretching nut of an existing hydraulic stretching device and a bolt to be stretched is complex and consumes much time are overcome, and the hydraulic stretching device is easy and convenient to use and capable of achieving quick connection of the stretching nut and the bolt.
Description
Technical field
The present invention relates to Automatic manual transmission field.Be specially a kind of hydraulic elongator.
Background technology
Bolts and nuts are that mechanical field assembles indispensable parts, the fixed form of bolts and nuts than other fixed forms more firmly, more reliable, thus become the most frequently used mode be fixed together by two or more parts.The bolt adopted due to some main equipment is relatively thicker, and its pretightning force is very large, if the fastening and dismounting of bolt is by manually having come, labour intensity is very high.In addition, due between parts connection need several, tens even tens bolts realize, manually to bolt carry out successively fastening and dismounting, the stress distribution of each link position can be caused uneven, thus affect the intensity of connector.
At present, many employings hydraulic elongator stretches to bolt, hydraulic elongator comprises hydraulic cylinder and stretching attaching parts, and stretching attaching parts are connected with bolt by its internal thread, are matched perpendicular to the end face of the projection of bolt straight line with the piston of hydraulic cylinder by it.Its operation principle is that stretching attaching parts are connected with bolt, hydraulic oil is injected in hydraulic jack, piston promotes the projection of stretching attaching parts, tensile force is applied to bolt, bolt is elongated, afterwards, can more easily realize the fastening or disassembling section that bolt carries out, and it is larger to realize fastening pretightning force.
When connecting bolt and stretching attaching parts, by the axis of stretching attaching parts and the axial alignment of bolt, the internal thread of stretching attaching parts is coordinated with the external screw thread of the end of bolt, this action need cover operator heavy gas with all worries set aside could realize, if operator's hand slightly rocks or at the bad environment of light, the external screw thread of the internal thread of stretching attaching parts and the end of bolt can be caused to unmatch.Circumgyration stretch attaching parts after the external screw thread of the internal thread of stretching attaching parts and the end of bolt is worked good, realize bolt and stretching attaching parts after the full thread engagement of the two.In some assembling field, such as high temperature or working environment under water, the operating time of operating personnel is limited, needs to connect stretching attaching parts and bolt rapidly.And the connection time that not only needs are longer when the external screw thread of the end of the internal thread with bolt that make stretching attaching parts coordinates of existing bolt and stretching attaching parts, stretching attaching parts are rotated a lot of circle of process need stretching attaching parts rotation to the position needed, this also makes the operating time long, causes operating efficiency lower.
Summary of the invention
The technical problem that the present invention solves is to overcome the stretching nut of existing hydraulic elongator and bolt attended operation to be tensioned complexity, time-consuming shortcoming, provides a kind of easy and can realize the hydraulic elongator that stretching nut is connected fast with bolt.
Hydraulic elongator of the present invention, comprising:
Hydraulic cylinder, the cross section of the cylinder body of described hydraulic cylinder is annular, and the cylinder body of described hydraulic cylinder surrounds the cavity supplying an end of bolt to be tensioned to pass, and the end face of the piston of described hydraulic cylinder forms pushing tow face;
Stretching nut, be made up of the first nut hitch and the second nut hitch, when described first nut hitch and described second nut sleeve button are locked together, the internal thread of described first nut hitch forms with the internal thread of described second nut hitch the internal thread coordinated with the external screw thread of described bolt jointly, and described stretching nut has near the end face of described hydraulic cylinder the stress surface coordinated with described pushing tow face to be made described stretching nut can push at described piston top to be parallel to moving axially of described hydraulic cylinder.
As preferably, described first nut sleeve fastener has the first pilot hole and the second pilot hole, the axis of described first pilot hole and the axis being parallel of the second pilot hole, described first pilot hole is provided with towards the first step of described second nut hitch away from one end of described second nut hitch;
Described second nut sleeve fastener has the first pilot hole and the second pilot hole, the axis of the first pilot hole of described second nut hitch and the axis being parallel of the second pilot hole, first pilot hole and second pilot hole of described second nut hitch include coaxial Part I and Part II, described Part I compared with described Part II further from described first nut hitch, the diameter of described Part I is greater than the diameter of described Part II, and is formed towards the blocking surface of described Part I at Part I and Part II junction;
Described stretching nut also comprises:
Locking axle sleeve, there is inner chamber, described locking axle sleeve part is positioned at the Part I of the first pilot hole of described second nut hitch, this part of described locking axle sleeve is provided with ball hole, another part of described locking axle sleeve is through the first pilot hole of described second nut hitch and the first pilot hole of the first nut hitch and fix with described first nut hitch, and described locking axle sleeve is being provided with one end that described first nut hitch is fixed the opening communicated with described inner chamber;
First guide finger, the inner chamber being positioned at described locking axle sleeve is coaxial with described locking axle sleeve, and can relatively described locking axle sleeve moving axially along locking axle sleeve, one end of described first guide finger is limited by the first step of the first pilot hole of described first nut hitch the one end making guide finger can not be provided with described first step from described first pilot hole and shifts out, this end of described first guide finger opening be provided with by described inner chamber reaches the pressing component of described second nut hitch outside, described first guide finger is provided with ball grooves in the position near its other end, near the first side wall of the described first guide finger other end, from bottom, the other end started to described first guide finger tilts described ball grooves, second sidewalls orthogonal relative with the first side wall of described ball grooves is in the axis of described first guide finger, part between the end of the described first guide finger other end and the first side wall of described ball grooves forms decorative pearl on top of an official cap outer rim,
First spring, is positioned at the inner chamber of described locking axle sleeve, and between the other end and the inwall of described inner chamber of described first guide finger, described first spring can apply towards the power of described first step to described first guide finger under compression;
At least one ball, a part for described ball is positioned at the ball hole of described locking axle sleeve, in the locked condition, described ball is by the outside jack-up of decorative pearl on top of an official cap outer rim of described first guide finger, thus part is exposed to described locking axle sleeve, the blocking surface that described ball is exposed in the part of described locking axle sleeve and the first pilot hole of described second nut hitch offsets to stop described locking axle sleeve to move towards the direction of the first nut hitch, in the unlocked state, described ball part is positioned at the ball hole of described locking axle sleeve, part is positioned at the ball grooves of the first guide finger, described ball enters the Part II of described first pilot hole along with described first guide finger,
Second guide finger, described second guide finger one end is positioned at the Part I of the second pilot hole of described second nut hitch, and the other end of described second guide finger is through the second pilot hole of described second nut hitch and the second pilot hole of described first nut hitch and fix with described first nut hitch.
As preferably, one end that described locking axle sleeve is positioned at the Part I of the first pilot hole of described second nut hitch is provided with limited cap, the diameter of described limited cap is greater than the diameter of described locking axle sleeve and is greater than the diameter of the Part II of described first pilot hole, described limited cap and described locking axle sleeve junction form first mating surface that can coordinate with the blocking surface of the first pilot hole of described second nut hitch, one end that described second guide finger is positioned at the Part I of the second pilot hole of described second nut hitch has limited cap, and the diameter of the limited cap of this second guide finger is greater than the diameter of described second guide finger and is greater than the diameter of the Part II of described second pilot hole, limited cap and the described second guide finger junction of this second guide finger form second mating surface that can coordinate with the blocking surface of the second pilot hole of described second nut hitch.
As preferably, being provided with in the first pilot hole of described first nut hitch can to the second spring of described second hitch applied thrust, and being provided with in the first pilot hole of described first nut hitch can to the 3rd spring of described second hitch applied thrust.
As preferably, the first rectification bulb is arranged with outside described locking axle sleeve, first corrects bulb comprises bulb and sleeve pipe, described second nut hitch and described first is corrected the relative position of bulb and is provided with and divides first caving in of matching with the described first ball head correcting bulb, described second spring housing is corrected outside the sleeve pipe of bulb described first, and the second step towards described second nut hitch of described second spring in the first pilot hole of described first nut hitch and the described first ball head correcting bulb divide between the first limiting convex block of formation, described second guide finger is provided with the second rectification bulb, described second corrects bulb comprises bulb and sleeve pipe, described second nut hitch and described second is corrected the relative position of bulb and is provided with and divides second caving in of matching with the described second ball head correcting bulb, described 3rd spring housing is corrected outside the sleeve pipe of bulb described second, and the step towards described second nut hitch in the second pilot hole of described first nut hitch and the described second ball head correcting bulb divide between the second limiting convex block of formation.
As preferably, described ball grooves is the endless groove around described first guide finger outer rim, the axis of described endless groove and the dead in line of described first guide finger, described ball hole is that described ball is evenly arranged in described ball hole along described ring-type around the described locking axle sleeve ring-type of a week.
As preferably, described blocking surface is inclined-plane.
As preferably, pressing component comprises the rod-like members be connected with described first guide finger and the hat shape parts be connected with one end that described rod-like members stretches out in described first nut hitch.
As preferably, be threaded connection between described locking axle sleeve and described first nut hitch, be threaded connection between described second guide finger and described first nut hitch.
As preferably, described first nut sleeve fastener has the first arc surface, and the internal thread of described first nut hitch is arranged on described first arc surface, and described first pilot hole and the second pilot hole lay respectively at the two ends of described first arc surface; Described second nut sleeve fastener has the first arc surface, first arc surface of described second nut hitch is relative with the first arc surface of described first nut hitch, the internal thread of described second nut hitch is arranged on the first arc surface of described second nut hitch, and the first pilot hole of the second nut hitch and the second pilot hole lay respectively at the two ends of the first arc surface of described second nut hitch.
As preferably, described first nut sleeve fastener has second arc surface parallel with its first arc surface, described second nut sleeve fastener has second arc surface parallel with its first arc surface, described first nut hitch and the second nut sleeve button are respectively equipped with at least one and allow shaft to insert so that rotate the blind hole of the stretching nut be under locking state, on the second arc surface that the opening of described blind hole lays respectively at described first nut hitch and on the second arc surface of the second nut hitch.
As preferably, described first nut hitch and the second nut hitch are the inclined-plane tilted relative to the axis of the stretching nut under described locking state near the end face of described hydraulic cylinder at least partially, under described stretching nut check state, the inclined-plane of described first nut hitch and the inclined-plane of described second nut hitch form described stress surface, and the pushing tow face of the piston of described hydraulic cylinder is also inclined-plane.
Compared to the prior art hydraulic elongator of the present invention, has following beneficial effect:
1, the stretching nut of hydraulic elongator of the present invention is by being mutually locked together the first nut hitch that also can unlock and be separated from each other and the second nut hitch is formed, when adopting hydraulic elongator of the present invention to carry out fastening, threaded engagement between stretching nut and bolt relies on the locking operation of stretching nut to realize, remove and fit through unlocking operation to realize between stretching nut and bolt, with the axial alignment of the axis needed stretching nut in prior art and bolt, and the operation of multipurpose rotary stretching nut is compared, the operation of locking and unblock is faster, under the working environment that some are special, as high temperature or underwater operation, operation efficiently seems and is even more important.
2, the limited cap of the stretching nut of hydraulic elongator and the junction, one end of locking axle sleeve form first mating surface that can coordinate with the blocking surface of the first pilot hole of the second nut hitch.In the unlocked state, first nut hitch and the second nut hitch are separated from each other, the first nut hitch and the second nut hitch distance farthest in, first mating surface of limited cap coordinates with the first blocking surface of the first pilot hole of the second nut hitch, namely the first blocking surface blocks the movement relative to the first nut hitch of locking axle sleeve, thus prevents the first nut hitch and locking axle sleeve in the unlocked state from departing from.
3, the second spring of stretching nut and the 3rd spring make the unlocking operation of stretching nut more simple, and operator only needs the pressing component of pressing first guide finger, can realize unlocking.
4, stretching nut first correct bulb the deflection that just can prevent locking axle sleeve is set.Meanwhile, the first sleeve portion correcting bulb is that the second spring provides more firmly mounting means, when can prevent the second spring from being compressed, deflection occurs.
5, the blocking surface of stretching nut and the first mating surface are inclined-plane, when first blocking surface and first mating surface of the first pilot hole of the second nut hitch offset and coordinate, not only can produce and be parallel in locking axle sleeve axis, also produce the power perpendicular to locking axle sleeve axis simultaneously, make locking axle sleeve can not produce the movement of paralleling to the axis relative to the first pilot hole, relative to the first pilot hole generation perpendicular to the movement of axis, namely can not rock.
Accompanying drawing explanation
Fig. 1 is the structural representation of the hydraulic elongator of one embodiment of the invention.
Fig. 2 is the structural representation of the stretching nut of the hydraulic elongator of one embodiment of the invention.
Fig. 3 is the sectional view of the stretching nut in Fig. 2 along A-A.
Fig. 4 is the enlarged diagram of the part B in Fig. 3.
Fig. 5 is the first nut hitch of stretching nut in Fig. 3 and the structural representation of the second nut hitch.
Fig. 6 is the structure for amplifying schematic diagram of the first guide finger of stretching nut in Fig. 2.
Fig. 7 is the structure for amplifying schematic diagram of the locking axle sleeve of stretching nut in Fig. 2.
Reference numeral
1-stretching nut
11-first nut hitch, 111-first arc surface, 1111-part internal thread, 112-first pilot hole, 1121-first step, 1122-second step, 1123-second spring, 113-second pilot hole, 1131-the 3rd spring, 114-second arc surface, 1141,1142-assembles blind hole, 115-inclined-plane;
12-second nut hitch, 121-first arc surface, 1211-part internal thread, 122-first pilot hole, 1221-Part I, 1222-Part II, 1223-first blocking surface, 123-second pilot hole, 1231-second blocking surface, 1232-Part I, 1233-Part II, 124-second arc surface, 1241,1242-assembles blind hole, 125-inclined-plane, 126-first caves in, and 127-second caves in;
13-locking axle sleeve, 131-inner chamber, 132-ball hole, 133-limited cap, 1331-first mating surface, 134-passage;
14-first guide finger, 141-pressing component, 1411-rod-like members, 1412-hat shape parts, 142-ball grooves, 1421-the first side wall, 1422-second sidewall, 143-decorative pearl on top of an official cap outer rim;
15-first spring;
16-ball;
17-second guide finger, 171-limited cap, 1711-second mating surface;
18-first corrects bulb, 181-bulb, 182-sleeve pipe;
19-second corrects bulb, 191-bulb, 192-sleeve pipe.
2-hydraulic cylinder
21-cylinder body, 22-piston, 221-pushing tow face, 23-cavity, 24-sealing device, 25-bracing or strutting arrangement, 26-hole.
3-lifting bolt
4-snap joint
5-dials rod
Detailed description of the invention
Fig. 1 is the structural representation of the hydraulic elongator of one embodiment of the invention, and as shown in Figure 1, hydraulic elongator of the present invention comprises hydraulic cylinder 2 and stretching nut 1.Wherein, hydraulic cylinder has cylinder body 21 and piston 22, and the cross section of cylinder body 21 is annular, and the cross section of piston 22 is circular.The cylinder body 21 of described hydraulic cylinder 2 surrounds the cavity 23 supplying an end of bolt (not shown) to be tensioned to pass.The end face of piston 22 forms pushing tow face 221.
The cylinder body 21 of hydraulic cylinder 2 is connected with snap joint 4 by transit joint and compound gasket, for injection liquid force feed in cylinder body 21.Sealing device 24 is provided with between the inwall of piston 22 and cylinder body 2, because cylinder body is ring-type, be equipped with sealing device 24 between piston 22 and cylinder body 21 inwall forming inner ring and between piston 22 and cylinder body 21 inwall forming outer shroud, sealing device 24 is generally cover on the piston 22 or embedding sealing ring on the piston 22.Cylinder body 21 is also provided with lifting bolt 3.
Hydraulic cylinder 2 has bracing or strutting arrangement 25 away from one end of stretching nut 1, and bracing or strutting arrangement 25 can be one-body molded with the cylinder body 21 of hydraulic cylinder.Bracing or strutting arrangement 25 is supported on to be tightened upper or ground, bracing or strutting arrangement 25 has for dialling excellent 5 holes 26 stretched into.Operator can stretch into the nut rotation of stirring bolt in hole 26 by dialling rod 5, thus clamp nut and bolt.
Stretching nut 1 is detained by the first nut hitch 11 and the second nut sleeve 12 and is formed, when described first nut hitch 11 is locked together with described second nut hitch 12, the internal thread 1111 of described first nut hitch 11 forms the internal thread coordinated with the external screw thread of described bolt jointly with the internal thread 1211 of described second nut hitch 12.Described stretching nut 1 has near the end face of described hydraulic cylinder 2 stress surface coordinated with described pushing tow face 221 makes described stretching nut can be parallel to the axis of described hydraulic cylinder and moving axially of bolt under described piston 21 pushing tow.
When stretching to bolt, the cavity 23 that the end of bolt is surrounded through the cylinder body 21 of bracing or strutting arrangement 25 and hydraulic cylinder 2, locks the first nut hitch 11 of stretching nut with the second nut hitch 12 and makes it form screw threads for fastening with the end of bolt and coordinate.Primer fluid cylinder pressure 2 piston 21 is promoted axis that stretching nut is parallel to bolt moves, thus make bolt produce axial distortion, utilize and dial the nuts that rod 2 stirs bolt and makes it fastening.When the piston of hydraulic cylinder sets back, the axial deformation of bolt is eliminated, and bolt, nut and fastener reach best fastening effect.
In the present invention, threaded engagement between stretching nut and bolt relies on the locking operation of stretching nut to realize, remove and fit through unlocking operation to realize between stretching nut and bolt, with the axial alignment of the axis needed stretching nut in prior art and bolt, and the operation of multipurpose rotary stretching nut is compared, the operation of locking and unblock is faster, under the working environment that some are special, as high temperature or underwater operation, operation efficiently seems and is even more important.
Fig. 2 is the structural representation of the stretching nut of the hydraulic elongator of one embodiment of the invention, and Fig. 3 is the sectional view of the stretching nut in Fig. 2 along A-A, and Fig. 4 is the enlarged diagram of the part A in Fig. 3.As shown in figs 2-4, stretching nut of the present invention, also comprises locking axle sleeve 3, first guide finger 4, first spring 5, ball 6 and the second guide finger 7.
In the present embodiment, as shown in Figure 5, described first nut hitch 11 has the first arc surface 111, and described first arc surface 111 has internal thread 1111.It is parallel with the first arc surface 111 that described first nut hitch 11 also has the second arc surface 114, second arc surface 114, and the radius of the second arc surface 114 is greater than the radius of the first arc surface 111.Described first nut hitch 11 has the first pilot hole 112 and the second pilot hole 113, described first pilot hole 112 and the second pilot hole 113 lay respectively at the two ends of described first arc surface 111, and the axis of described first pilot hole 112 and the axis being parallel of the second pilot hole 113, described first pilot hole 112 is provided with towards the first step 1121 of described second nut hitch 12 away from one end of described second nut hitch 12.
Described second nut hitch 12 has the first arc surface 121, and the first arc surface 121 of described second nut hitch 12 is relative with the first arc surface 111 of described first nut hitch 11, and the diameter of the two is identical.First arc surface 121 of described second nut hitch 12 has internal thread 1211, and the internal thread 1111 of the first nut hitch 11 is identical with each parameter of screw thread of the internal thread 1211 of the second nut hitch 12.It is parallel with the first arc surface 121 that described second nut hitch 12 also has the second arc surface 124, second arc surface 124, and the radius of the second arc surface 124 is identical with the radius of the second arc surface 114 of the first nut hitch 11.
Under the state that described first nut hitch 11 and the second nut hitch 12 are locked, first arc surface 111 of the first nut hitch 11 and the first arc surface 121 basic comprising circle of the second nut hitch 12, the second arc surface 114 of the first nut hitch 11 and the second arc surface 124 basic comprising circle of the second nut hitch 12.The internal thread 1111 of the first nut hitch 11 forms the internal thread coordinated with the external screw thread of bolt to be connected jointly with the internal thread 1211 of the second nut hitch 12.
In the present embodiment, as shown in Figure 5, described first nut hitch 11 and the second nut hitch 12 are respectively equipped with at least one and allow shaft to insert so that rotate the assembling blind hole of the stretching nut be under locking state, and the opening of described blind hole lays respectively on the second arc surface 114 of described first nut hitch 11 and the second arc surface 124 of the second nut hitch 12.As shown in Figure 5, the first nut hitch 11 has assembling blind hole 1141,1142, second nut hitch 12 and has assembling blind hole 1241,1242.
Described second nut hitch 12 has the first pilot hole 122 and the second pilot hole 123, first pilot hole 122 of the second nut hitch 12 and the second pilot hole 123 lay respectively at the two ends of described first arc surface 121, and the axis of the first pilot hole 122 of the second nut hitch 12 and the axis being parallel of the second pilot hole 123.Described first pilot hole 122 and the second pilot hole 123 include coaxial Part I and Part II, described Part I compared with described Part II further from described first nut hitch 11.The diameter of described Part I is greater than the diameter of described Part II, and is formed towards the blocking surface of described Part I at Part I and Part II junction.Namely the first pilot hole 122 and the second pilot hole 123 are shoulder hole, and ladder forms blocking surface towards the face of the large part of Part I and aperture.
Specific in the present embodiment, as shown in Figure 5, first pilot hole 122 of the second nut hitch 12 has Part I 1221 and Part II 1222, and Part I 1221 and Part II 1222 junction are formed towards the first blocking surface 1223 of described Part I 1221.Second pilot hole 123 of the second nut hitch 12 has Part I 1232 and Part II 1233, and Part I 1232 and Part II 1233 junction are formed towards the second blocking surface 1231 of described Part I 1232.
As shown in figs. 4 and 7, locking axle sleeve 13 has inner chamber 131, and the part of described locking axle sleeve 13 is positioned at the Part I 1221 of the first pilot hole 122 of described second nut hitch 12.This part of described locking axle sleeve 13 is provided with ball hole 132, for holding the part of ball 16.In the present embodiment, locking axle sleeve 13 is also provided with passage 134, and passage 134 is between ball hole 132 and the termination of this part.
Another part of described locking axle sleeve 13 is through the first pilot hole 122 of described second nut hitch 12 and the first pilot hole 112 of the first nut hitch 11 and fix with described first nut hitch 11, the dead in line of the axis of locking axle sleeve 13 and the axis of the first nut hitch 11 and the second nut hitch 12.One end that described locking axle sleeve 13 is fixed with the first nut hitch 11 is provided with the opening communicated with described inner chamber 131, and opening communicates with the outside of the first nut axle sleeve 11, and the axis of the opening of inner chamber 131 overlaps with the axis of locking axle sleeve 13.
As shown in Figure 4, the inner chamber 131 that the first guide finger 14 is positioned at described locking axle sleeve 13 is coaxial with locking axle sleeve 13, and can relatively described locking axle sleeve 13 moving axially along locking axle sleeve 13.As shown in Figure 6, one end of described first guide finger 14 opening be provided with by described inner chamber 131 reaches the pressing component 141 of described second nut hitch 12 outside, and pressing component 141 can promote the first guide finger 14 and move to the left in Fig. 4 relative to locking axle sleeve 13.One end that described first guide finger 14 is provided with pressing component 141 is limited in this first pilot hole 112 by the first step 1121 of the first pilot hole 112 of described first nut hitch 11, described first step 1121 is positioned at the first pilot hole one end away from the second nut hitch 12 of the first nut hitch 11, the step surface of first step 1121, towards the second nut hitch 12, makes the first guide finger 14 can not shift out from this end of the first pilot hole.
As shown in Figure 6, described first guide finger 14 is provided with ball grooves 142 in the position near its other end, the opening of ball grooves 142 is positioned on the cylinder of the first guide finger 14, is namely parallel on the face of the axis of the first guide finger 14, instead of on the end face of the first guide finger 14.Near the first side wall 1421 of described first guide finger 14 other end, from bottom, the other end started to described first guide finger 14 tilts described ball grooves 142, and second sidewall 1422 relative with the first side wall 1421 of described ball grooves 142 is perpendicular to the axis of described first guide finger 14.Part between the end of described first guide finger 14 other end and the first side wall 1421 of described ball grooves 142 forms decorative pearl on top of an official cap outer rim 143.When the first guide finger 14 moves to the right side in Fig. 3 relative to locking axle sleeve 3, make ball 16 can be moved to the decorative pearl on top of an official cap outer rim 143 of the first guide finger 14 along the first side wall 1421 tilted in described ball grooves 142, by decorative pearl on top of an official cap outer rim 143 outwards jack-up.
First spring 15 is positioned at the inner chamber 131 of described locking axle sleeve 13, and between the other end and the inwall of described inner chamber 131 of described first guide finger 14, when the first spring 15 is in compressive state, can apply towards the power of first step 1121 described first guide finger 14.
Ball 16 is at least one, and a part for described ball 16 is positioned at the ball hole 132 of described locking axle sleeve 13.In the locked condition, ball 16 is by the decorative pearl on top of an official cap outer rim 143 of the first guide finger 14 outwards jack-up, thus part is exposed to described locking axle sleeve 13.The first blocking surface 1223 that ball 16 is exposed in the part of described locking axle sleeve 13 and the first pilot hole 122 of the second nut hitch 12 offsets, and moves towards the direction of the first nut hitch 11 to stop described locking axle sleeve 13.In the unlocked state, described ball 16 part is positioned at the ball hole 132 of described locking axle sleeve 13, and part is positioned at the ball grooves 142 of the first guide finger 14, and enters the Part II 1222 of described first pilot hole 122 along with described first guide finger 14.
Described second guide finger 17 one end is positioned at the Part I 1232 of the second pilot hole 123 of described second nut hitch 12, and the other end of described second guide finger 17 is through the second pilot hole 123 of described second nut hitch 12 and the second pilot hole 113 of described first nut hitch 11 and fix with described first nut hitch 11.In the process of locking and unlock, the second guide finger 17 serves the effect of guiding, makes the two ends of the two ends of the first nut hitch 11 and the second nut hitch 12 reach stress balance respectively.
The operation unlocked stretching nut is as follows: pressed inwards by the pressing component 141 of the first guide finger 14, namely the direction towards the second nut hitch 12 is pressed, the thrust that first guide finger 14 overcomes the first spring 15 moves to the direction near the second nut hitch 12, simultaneously, locking axle sleeve 13, owing to fixing with the first nut hitch 11, therefore can not move.When the first guide finger 14 move to its ball grooves 142 relative with the ball hole 132 of locking axle sleeve 13 time, the part of ball 16 enters ball grooves 142 along the first side wall 1421 of ball grooves 142, ball 16 submerge in ball hole 132 to outer end, depart from and the coordinating of the first blocking surface 1223 of the second nut hitch 12.Now, first nut hitch 11 or the second nut hitch 12 are applied to the power making mutually to leave both it, first guide finger 14, axle sleeve move relative to the second nut hitch 12 together with ball 16, and ball 16 enters in the Part II of the first pilot hole 122 of the second nut hitch 12.Because the diameter of Part II 1222 is less than the diameter of Part I 1221, ball 16 is limited in ball grooves 142 and ball hole 132 by the inwall of Part II 1222 and can not outwards movement.Now, unclamp pressing component 141, because ball 16 can not outwards movement, outward namely away from the direction of the axis of the first guide finger 4, first guide finger 14 just can not move towards the first nut hitch 11 under the thrust of the first spring 15, and the first spring 15 is limited at compressive state.Now just achieve unblock.
When locking in the unlocked state, the end of bolt is made to stretch between the first nut hitch 11 and the second nut hitch 12, in the unlocked state, first nut hitch 11 is separated with the second nut hitch 12, therebetween there is larger distance, therefore, aforesaid operations can be easy to realize, and does not need the operation making the internal thread of nut coordinate with the external screw thread of the end of bolt in prior art.Then, make the first nut hitch 11 and the second nut hitch 12 close to each other, guide finger, locking axle sleeve 13 moves relative to the second nut hitch 12 together with ball 16, when ball 16 enters into the Part I 1221 of the first pilot hole 122 of the second nut hitch 12, because the inwall without Part II 1222 limits, under the promotion of the first spring 15, guide finger moves to the direction near the first nut hitch 11 relative to locking axle sleeve 13, ball 16 is ejected along the sidewall of ball grooves 142, until the inner terminal of ball 16 is by decorative pearl on top of an official cap outer rim 143 jack-up, as shown in Figure 4.Now, cancel and make the first nut hitch 11 and the second nut hitch 12 external force close to each other, this external force can be the kneading power of hand, and ball 16 coordinates with the first blocking surface 1223, achieves locking.
When stretching nut is locked, operator manually by the first nut hitch 11 and the second nut hitch 12 kneaded together, the locking of stretching nut can be realized.The power that the pressing component manually pressing the first guide finger 14 also applies the first nut hitch 11 and the second nut hitch 12 are separated from each other can realize the unblock of stretching nut.Compared with installing the operation of nut of the prior art, locking and the unblock of the stretching nut of hydraulic elongator of the present invention are not only easy and simple to handle, also greatly can save the time of installing stretching nut nut simultaneously, thus improve the efficiency of tensile bolt.
As preferably, as shown in Figure 4, one end that described locking axle sleeve 13 is positioned at the Part I 1221 of the first pilot hole 122 of described second nut hitch 12 is provided with limited cap 133, limited cap 133 and locking axle sleeve 13 can be one-body molded, also can be fixed together, in the present embodiment, limited cap 133 and locking axle sleeve 13 are integrated.The diameter of described limited cap 133 is greater than the diameter of described locking axle sleeve 13 and is greater than the diameter of the Part II 1222 of described first pilot hole 122.Described limited cap 133 and the junction, one end of described locking axle sleeve 13 form first mating surface 1331 that can coordinate with the first blocking surface 1223 of the first pilot hole 122 of described second nut hitch 12.In the unlocked state, first nut hitch 11 and the second nut hitch 12 are separated from each other, at the first nut hitch 11 and the second nut hitch 12 apart from farthest, first mating surface 1331 of limited cap 133 coordinates with the first blocking surface 1223 of the first pilot hole 122 of the second nut hitch 12, namely the first blocking surface 1223 blocks the movement relative to the first nut hitch 11 of locking axle sleeve 13, thus prevents the first nut hitch 11 in the unlocked state from departing from locking axle sleeve 13.
In like manner, one end that described second guide finger 17 is positioned at the Part I 1232 of the second pilot hole 123 of described second nut hitch 12 is provided with limited cap 171, and the diameter of the limited cap 171 of this second guide finger 17 is greater than the diameter of described second guide finger 17 and is greater than the diameter of the Part II 1233 of described second pilot hole 123.The limited cap 171 of this second guide finger 17 forms second mating surface 1711 that can coordinate with the second blocking surface 1231 of the second pilot hole of described second nut hitch 12 with described second guide finger 17 junction, prevents the first nut hitch 11 and the second guide finger 17 in the unlocked state from departing from.
As preferably, as shown in Figure 4, being provided with in first pilot hole 112 of described first nut hitch 11 can to the second spring 1123 of described second hitch applied thrust, and being provided with in the second pilot hole 113 of described first nut hitch 11 can to the 3rd spring 1131 of described second nut hitch 12 applied thrust.Under the state of locking, the second spring 1123 and the 3rd spring 1131 are in by the state compressed.When unlocking, by pressure pressing component 141, when ball grooves 142 aligns with ball hole 132, ball 16 enters ball grooves 142, and the first spring 15 is in by the state compressed.Now, second spring 1123 and the 3rd spring 1131 promote the second nut hitch 12 and leave the first nut hitch 11, namely ball 16 moves into the Part II of the first pilot hole 122 of the second nut hitch 12 to the right in Fig. 3 relative to the first nut hitch 11, namely achieves unblock.Second spring 1123 and the 3rd spring 1131 make the operation of unblock more simple, and operator only needs the pressing component 141 of pressing first guide finger 14, can realize unlocking.
As preferably, as shown in Figure 4, be arranged with the first rectification bulb 18, first rectification bulb 18 outside described locking axle sleeve 13 and comprise bulb 181 and sleeve pipe 182.What described second nut hitch 12 and described first corrected that the relative position of bulb 18 is provided with that bulb 181 part of correcting bulb 18 with described first matches first caves in 126.Described second spring 1123 is enclosed within described first and corrects outside the sleeve pipe 182 of bulb 18, and between the first limiting convex block of being formed of bulb 181 part that the second step 1122 and described first towards described second nut hitch 12 of described second spring 1123 in the first pilot hole 112 of described first nut hitch 11 corrects bulb 18.
Described second guide finger 17 is provided with the second rectification bulb 19, described second corrects bulb 19 comprises bulb 191 and sleeve pipe 192, what described second nut hitch 12 and described second corrected that the relative position of bulb 19 is provided with that bulb 191 part of correcting bulb 19 with described second matches second caves in 127, described 3rd spring 1131 is enclosed within described second and corrects outside the sleeve pipe 192 of bulb 19, and between the second limiting convex block of being formed of bulb 191 part that bulb 19 corrected by the step and described second towards described second nut hitch 12 in the second pilot hole 113 of described first nut hitch 11.
Because locking axle sleeve 13 length is all far longer than its diameter, and locking axle sleeve 13 relative sliding in the first pilot hole 112 of the first nut hitch 11 and the first pilot hole 122 of the second nut hitch 12, therefore be not tight fit with coordinating of pilot hole, therefore easily there is deflection in locking axle sleeve 13 in pilot hole.When under the state that stretching nut is in unblock, first nut hitch 11 is separated with the second nut hitch 12, the middle part of locking axle sleeve 13 does not coordinate with the first pilot hole 112 of the first nut hitch 11 and the first pilot hole 122 of the second nut hitch 12, more easily deflection occurs.And first correct bulb 18 the deflection that just can prevent locking axle sleeve 13 is set.Meanwhile, the first sleeve pipe 182 part of correcting bulb 18 is that the second spring 1123 provides more firmly mounting means, can prevent the second spring 1123 from by during compression, deflection being occurred.The first limiting convex block that first bulb 181 correcting bulb 18 is formed is the point of application that the second spring 1123 provides the force to the second nut hitch 12.The effect that bulb 8 is corrected in second effect and first of correcting bulb 19 is similar, repeats no more herein.
In the present embodiment, described ball grooves 142 is the endless groove around described first guide finger 14 outer rim, the axis of described endless groove and the dead in line of described first guide finger 14, described ball hole 132 is that described ball 16 is evenly arranged in described ball hole 132 along described ring-type around the described locking axle sleeve ring-type of 13 1 weeks.In other examples, also multiple independently ball grooves can be set along the excircle of the first guide finger, locking axle sleeve arranges multiple independently ball hole, the position one_to_one corresponding of ball grooves and ball hole.Now, the structure preventing the first guide finger from rotating relative to locking axle sleeve is preferably set, such as, projection can be set on the excircle of the first guide finger, the inwall of locking axle sleeve arranges the track with its axis being parallel, like this, the first guide finger all can not rotate relative to locking axle sleeve when being static relative to locking axle sleeve or when moving, thus ensures the position one_to_one corresponding of ball grooves and ball hole.
As preferably, the first blocking surface 1223 of the first pilot hole 122 of the second nut hitch 122 and the second blocking surface 1231 of the second pilot hole are inclined-plane, and namely blocking surface tilts relative to the axis of pilot hole.When blocking surface is inclined-plane, the first mating surface 1331 of the limited cap 133 of locking axle sleeve 13 and the second mating surface 1711 of the second guide finger 17 are also inclined-plane.When first blocking surface 1223 and first mating surface 1331 of the first pilot hole 122 of the second nut hitch 12 offset and coordinate, not only can produce and be parallel in locking axle sleeve 13 axis, also produce the power perpendicular to locking axle sleeve 13 axis simultaneously, make locking axle sleeve 13 can not produce the movement of paralleling to the axis relative to the first pilot hole 122, movement perpendicular to axis can not be produced relative to the first pilot hole 122, namely rock.The offseting to coordinate of second blocking surface 1231 of the second pilot hole of the second nut hitch 12 and the second mating surface 1711 also makes the second guide finger 17 can not produce the movement of paralleling to the axis relative to the second pilot hole, can not be equivalent to the second pilot hole and produce rocking perpendicular to axis.
Certainly in other examples, blocking surface also can perpendicular to the axis of pilot hole.The each parts described in this section are the parts of the second nut hitch.
Pressing component 141 comprises the rod-like members 1411 be connected with described first guide finger 14 and the hat shape parts 1412 be connected with one end that described rod-like members 1411 stretches out in described first nut hitch 11, hat shape parts 1412 area is larger, be convenient to apply pressing force, rod-like members 1411 is for transmitting pressing force.Certainly, in other examples, hat shape parts 1412 also can be set to stopping means simultaneously, and when hat shape parts 1412 and the first nut hitch 11 offset, ball grooves 142 just in time aligns with ball hole 132.
Be threaded connection between described locking axle sleeve 13 and described first nut hitch 11, be specially, the part of the first pilot hole 112 between its first step 1121 and second step 1122 of the first nut hitch 11 is provided with internal thread, and locking axle sleeve 13 is connected with internal thread by its external screw thread.Be threaded connection between described second guide finger 17 and described first nut hitch 11.In the present embodiment, the first pilot hole 112 of the first nut hitch 11 is through hole, and the second pilot hole 113 is blind hole.
As shown in Figure 2, described first nut hitch 11 and the second nut hitch 12 are the inclined-plane tilted relative to the axis of the stretching nut under described locking state near the end face of described hydraulic cylinder 2 at least partially.As shown in Figure 2, the first nut hitch 11 has inclined-plane 115, and the second nut hitch 12 vertical axis had in inclined-plane 125, Fig. 2 is depicted as the axis of stretching nut.Under described stretching nut check state, the inclined-plane 115 of described first nut hitch 11 forms described stress surface with the inclined-plane 125 of described second nut hitch 12, and the pushing tow face 221 of the piston 22 of described hydraulic cylinder 2 is also inclined-plane.
In the process of tensile bolt, piston 22 applies the power perpendicular to the axis of stretching nut 1 to the inclined-plane of stretching nut 1, that is, make the power that stretching nut 1 is locked.Piston 22 also promotes stretching nut 1 and moves along its axis, and stretching nut 1 drives bolt elongate to be out of shape.The operation that hydraulic elongator of the present invention makes piston promote stretching nut by primer fluid cylinder pressure can realize two actions---locking stretching nut and tensile bolt.Compared with prior art, eliminate the operation being arranged on by stretching nut before tensile bolt and bolt making the two threaded engagement, therefore, operation can be made easier, further increase efficiency.
Above embodiment is only exemplary embodiment of the present invention, and be not used in restriction the present invention, protection scope of the present invention is defined by the claims.Those skilled in the art are in essence of the present invention and protection domain, and the various amendment make the present invention or equivalent replacement also drop in protection scope of the present invention.
Claims (12)
1. a hydraulic elongator, is characterized in that, comprising:
Hydraulic cylinder, the cross section of the cylinder body of described hydraulic cylinder is annular, and the cylinder body of described hydraulic cylinder surrounds the cavity supplying an end of bolt to be tensioned to pass, and the end face of the piston of described hydraulic cylinder forms pushing tow face;
Stretching nut, be made up of the first nut hitch and the second nut hitch, when described first nut hitch and described second nut sleeve button are locked together, the internal thread of described first nut hitch forms with the internal thread of described second nut hitch the internal thread coordinated with the external screw thread of described bolt jointly, and described stretching nut has near the end face of described hydraulic cylinder the stress surface coordinated with described pushing tow face to be made described stretching nut can push at described piston top to be parallel to moving axially of described hydraulic cylinder.
2. hydraulic elongator according to claim 1, is characterized in that,
Described first nut sleeve fastener has the first pilot hole and the second pilot hole, the axis of described first pilot hole and the axis being parallel of the second pilot hole, described first pilot hole is provided with towards the first step of described second nut hitch away from one end of described second nut hitch;
Described second nut sleeve fastener has the first pilot hole and the second pilot hole, the axis of the first pilot hole of described second nut hitch and the axis being parallel of the second pilot hole, first pilot hole and second pilot hole of described second nut hitch include coaxial Part I and Part II, described Part I compared with described Part II further from described first nut hitch, the diameter of described Part I is greater than the diameter of described Part II, and is formed towards the blocking surface of described Part I at Part I and Part II junction;
Described stretching nut also comprises:
Locking axle sleeve, there is inner chamber, described locking axle sleeve part is positioned at the Part I of the first pilot hole of described second nut hitch, this part of described locking axle sleeve is provided with ball hole, another part of described locking axle sleeve is through the first pilot hole of described second nut hitch and the first pilot hole of the first nut hitch and fix with described first nut hitch, and described locking axle sleeve is being provided with one end that described first nut hitch is fixed the opening communicated with described inner chamber;
First guide finger, the inner chamber being positioned at described locking axle sleeve is coaxial with described locking axle sleeve, and can relatively described locking axle sleeve moving axially along locking axle sleeve, one end of described first guide finger is limited by the first step of the first pilot hole of described first nut hitch the one end making guide finger can not be provided with described first step from described first pilot hole and shifts out, this end of described first guide finger opening be provided with by described inner chamber reaches the pressing component of described second nut hitch outside, described first guide finger is provided with ball grooves in the position near its other end, near the first side wall of the described first guide finger other end, from bottom, the other end started to described first guide finger tilts described ball grooves, second sidewalls orthogonal relative with the first side wall of described ball grooves is in the axis of described first guide finger, part between the end of the described first guide finger other end and the first side wall of described ball grooves forms decorative pearl on top of an official cap outer rim,
First spring, is positioned at the inner chamber of described locking axle sleeve, and between the other end and the inwall of described inner chamber of described first guide finger, described first spring can apply towards the power of described first step to described first guide finger under compression;
At least one ball, a part for described ball is positioned at the ball hole of described locking axle sleeve, in the locked condition, described ball is by the outside jack-up of decorative pearl on top of an official cap outer rim of described first guide finger, thus part is exposed to described locking axle sleeve, the blocking surface that described ball is exposed in the part of described locking axle sleeve and the first pilot hole of described second nut hitch offsets to stop described locking axle sleeve to move towards the direction of the first nut hitch, in the unlocked state, described ball part is positioned at the ball hole of described locking axle sleeve, part is positioned at the ball grooves of the first guide finger, described ball enters the Part II of described first pilot hole along with described first guide finger,
Second guide finger, described second guide finger one end is positioned at the Part I of the second pilot hole of described second nut hitch, and the other end of described second guide finger is through the second pilot hole of described second nut hitch and the second pilot hole of described first nut hitch and fix with described first nut hitch.
3. hydraulic elongator according to claim 2, it is characterized in that: one end that described locking axle sleeve is positioned at the Part I of the first pilot hole of described second nut hitch is provided with limited cap, the diameter of described limited cap is greater than the diameter of described locking axle sleeve and is greater than the diameter of the Part II of described first pilot hole, described limited cap and described locking axle sleeve junction form first mating surface that can coordinate with the blocking surface of the first pilot hole of described second nut hitch, one end that described second guide finger is positioned at the Part I of the second pilot hole of described second nut hitch has limited cap, and the diameter of the limited cap of this second guide finger is greater than the diameter of described second guide finger and is greater than the diameter of the Part II of described second pilot hole, limited cap and the described second guide finger junction of this second guide finger form second mating surface that can coordinate with the blocking surface of the second pilot hole of described second nut hitch.
4. stretching nut according to claim 3, it is characterized in that: being provided with in the first pilot hole of described first nut hitch can to the second spring of described second hitch applied thrust, and being provided with in the first pilot hole of described first nut hitch can to the 3rd spring of described second hitch applied thrust.
5. stretching nut according to claim 4, it is characterized in that: outside described locking axle sleeve, be arranged with the first rectification bulb, first corrects bulb comprises bulb and sleeve pipe, described second nut hitch and described first is corrected the relative position of bulb and is provided with and divides first caving in of matching with the described first ball head correcting bulb, described second spring housing is corrected outside the sleeve pipe of bulb described first, and the second step towards described second nut hitch of described second spring in the first pilot hole of described first nut hitch and the described first ball head correcting bulb divide between the first limiting convex block of formation, described second guide finger is provided with the second rectification bulb, described second corrects bulb comprises bulb and sleeve pipe, described second nut hitch and described second is corrected the relative position of bulb and is provided with and divides second caving in of matching with the described second ball head correcting bulb, described 3rd spring housing is corrected outside the sleeve pipe of bulb described second, and the step towards described second nut hitch in the second pilot hole of described first nut hitch and the described second ball head correcting bulb divide between the second limiting convex block of formation.
6. the stretching nut according to any one of claim 2-5, it is characterized in that: described ball grooves is the endless groove around described first guide finger outer rim, the axis of described endless groove and the dead in line of described first guide finger, described ball hole is that described ball is evenly arranged in described ball hole along described ring-type around the described locking axle sleeve ring-type of a week.
7. the stretching nut according to any one of claim 2-5, is characterized in that: described blocking surface is inclined-plane.
8. the stretching nut according to any one of claim 2-5, is characterized in that: pressing component comprises the rod-like members be connected with described first guide finger and the hat shape parts be connected with one end that described rod-like members stretches out in described first nut hitch.
9. the stretching nut according to any one of claim 2-5, is characterized in that: be threaded connection between described locking axle sleeve and described first nut hitch, is threaded connection between described second guide finger and described first nut hitch.
10. the stretching nut according to any one of claim 2-5, it is characterized in that: described first nut sleeve fastener has the first arc surface, the internal thread of described first nut hitch is arranged on described first arc surface, and described first pilot hole and the second pilot hole lay respectively at the two ends of described first arc surface; Described second nut sleeve fastener has the first arc surface, first arc surface of described second nut hitch is relative with the first arc surface of described first nut hitch, the internal thread of described second nut hitch is arranged on the first arc surface of described second nut hitch, and the first pilot hole of the second nut hitch and the second pilot hole lay respectively at the two ends of the first arc surface of described second nut hitch.
11. stretching nuts according to claim 10, it is characterized in that: described first nut sleeve fastener has second arc surface parallel with its first arc surface, described second nut sleeve fastener has second arc surface parallel with its first arc surface, described first nut hitch and the second nut sleeve button are respectively equipped with at least one and allow shaft to insert so that rotate the blind hole of the stretching nut be under locking state, on the second arc surface that the opening of described blind hole lays respectively at described first nut hitch and on the second arc surface of the second nut hitch.
12. stretching nuts according to any one of claim 2-5, it is characterized in that: described first nut hitch and the second nut hitch are near the inclined-plane of end face at least partially for tilting relative to the axis of the stretching nut under described locking state of described hydraulic cylinder, under described stretching nut check state, the inclined-plane of described first nut hitch and the inclined-plane of described second nut hitch form described stress surface, and the pushing tow face of the piston of described hydraulic cylinder is also inclined-plane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510763447.9A CN105328444B (en) | 2015-11-10 | 2015-11-10 | A kind of hydraulic elongator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510763447.9A CN105328444B (en) | 2015-11-10 | 2015-11-10 | A kind of hydraulic elongator |
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| CN105328444B CN105328444B (en) | 2018-03-13 |
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| CN108007782A (en) * | 2017-12-29 | 2018-05-08 | 襄阳福瑞特机械制造有限公司 | Bolt strength detection device and method |
| CN111300333A (en) * | 2020-04-07 | 2020-06-19 | 重庆江增船舶重工有限公司 | Mixed-flow turbocharger shaft sleeve mounting tool and method |
| CN114083490A (en) * | 2022-01-25 | 2022-02-25 | 江苏华恩机械科技有限公司 | Hydraulic stretcher with intelligent calibration function and method thereof |
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|---|---|
| CN105328444B (en) | 2018-03-13 |
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