CN115324356A - Stretching machine for metal steel bar - Google Patents
Stretching machine for metal steel bar Download PDFInfo
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- CN115324356A CN115324356A CN202210980305.8A CN202210980305A CN115324356A CN 115324356 A CN115324356 A CN 115324356A CN 202210980305 A CN202210980305 A CN 202210980305A CN 115324356 A CN115324356 A CN 115324356A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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Abstract
The invention relates to the technical field of metal processing, in particular to a tensioning machine for metal steel bars, which comprises a pre-buried mechanism, a locking mechanism and a piston mechanism, wherein the pre-buried mechanism comprises an anchor backing plate buried on a flat end surface, a through hole is formed in the end surface of the anchor backing plate for the insertion of the steel bar to be processed, and the locking mechanism comprises a working anchor and a working clamp which are sequentially arranged on one side of the anchor backing plate. According to the invention, the fixing part is utilized between the working anchorage device for fixing the steel bar and the working clamp to enhance the adhesive force to the steel bar during steel bar stretching, so that the phenomenon of wire slipping is avoided, after the anchorage device and the clamp sequentially penetrate through the steel bar, the rotating piece is rotated at a certain angle by utilizing the matching between the guide button and the rotating piece arranged on the piston mechanism, when the rotating piece is screwed into the concave surface of the fixing part, the two bending ends of the fixing part are opened and respectively abutted against the hole in the anchorage device and the steel bar, so that the fixing effect is enhanced.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to a tensioning machine for a metal steel bar.
Background
In the treatment process of the metal bars in a plurality of fields such as buildings, bridges and the like, the metal steel bars are required to be subjected to tension in advance, the metal bars subjected to prestress tension bear compressive stress, certain deformation is generated, and the durability of the metal bars in use can be effectively improved.
Generally, the application scenes of tensioning and combining metal bars with tensioning construction are mainly divided into pre-processing and construction site processing, but the core purpose is to apply tension to the steel bars to enable the steel bars to bear stress, the traditional tensioning is basically carried out through the cooperation of an anchorage device and a jack, and when the anchorage device is installed, due to the fact that the fixing mode of the steel bars is single, the phenomenon of wire slipping exists in the process of pulling the steel bars when some clamping pieces are used for too long time, tensioning failure is caused, and even reinstallation is required to carry out calibration.
Therefore, a stretching machine for metal steel bars is proposed to solve the above proposed problems.
Disclosure of Invention
Solves the technical problem
Aiming at the defects in the prior art, the invention provides the stretching machine for the metal steel bar, which can effectively solve the problem that the fixing mode of the steel bar in the stretching engineering of the steel bar in the prior art is single.
Technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention provides a tensioning machine for metal steel bars, which comprises an embedded mechanism, a locking mechanism and a piston mechanism, wherein the embedded mechanism comprises an anchor backing plate embedded on a flat end surface, a through hole is formed in the end surface of the anchor backing plate and used for inserting a steel bar to be processed, the locking mechanism comprises a working anchor and a working clamp which are sequentially installed on one side of the anchor backing plate, a taper hole used for inserting the steel bar is formed in the end surface of the working anchor, the working clamp is sleeved on the steel bar and inserted into the taper hole, and the piston mechanism abuts against one side of the working clamp and drives the steel bar to move towards the opposite direction of the working clamp.
Wherein, lie in and radially seted up the recess along the rod iron on the work fixture, lie in the recess and distribute the mounting that can warp towards work fixture circumferential direction, the mounting is whole to be the platelike structure of buckling, and the point of application of force of one of them end of buckling is towards the rod iron, and another end of buckling is established in the outside of recess to can contradict on the pore wall in the taper hole and increase the adhesive force to the rod iron.
Further, the work fixture comprises a rotary piece, the whole work fixture is in a round table shape with a round table-shaped cavity inside, the rotary piece is rotatably installed in the work fixture, one side of the rotary piece can be rotated into the space between the concave surfaces of the fixing piece, and meanwhile force is applied to the corresponding end surfaces of the two bending ends.
Further, the rotor is including rotation portion and conflict portion, rotation portion and the concentric coaxial of work fixture to cooperate with piston mechanism and rotate in the tool holder, conflict portion wholly is T type structure and installs in one side of rotation portion, and its short arm end can be along the rotation of rotation portion and screw into the concave surface of mounting, the position in conflict portion screw into the concave surface of mounting increases along its direction of rotation thickness gradually.
Furthermore, an arc-shaped groove is formed in the outer side end of the rotating portion, the arc-shaped groove comprises a guide portion and a bent portion, the guide portion is axially extended from the rotating piece towards one end of the piston mechanism, the bent portion is bent from one side of the guide portion towards the tangential direction of the rotating portion, a guide button capable of being inserted into the arc-shaped groove is arranged in the piston mechanism, and the guide button can axially move in the arc-shaped groove towards the direction of the working anchor.
Furthermore, a piece of abutting piece is fixedly arranged in the piston mechanism, jacks corresponding to the taper holes are formed in the abutting piece, a fixing plate is vertically arranged on one side of each jack respectively, and the guide buttons are vertically arranged on the vertical side of the fixing plate and are inserted into the arc-shaped grooves along with the movement of the piston mechanism in the direction of the rotary piece.
Furthermore, the bottom end of the guide button is in a hemispherical shape, and the tail end of the bent part is subjected to smooth polishing treatment.
Furthermore, the guide button is movably connected with the fixing plate, a limiting hole is formed in the plate surface of the fixing plate, one side of the guide button is inserted into the limiting hole, and a spring is arranged between the guide button and the limiting hole.
Furthermore, the fixing piece also comprises a lug, an annular cavity is formed in the taper hole, the lug is installed on the fixing piece and faces to one side end face of the inner wall of the taper hole, the section of the side end of the lug is triangular, anti-skid threads are distributed on the inclined plane of the lug, and the side end of the lug is intersected with the side wall of the annular cavity.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
according to the invention, the fixing piece is utilized between the working anchorage device for fixing the steel bar and the working clamp to enhance the adhesive force to the steel bar during steel bar stretching, so that the phenomenon of wire slipping is avoided, after the anchorage device and the clamp sequentially penetrate through the steel bar, the rotating piece is rotated at a certain angle by utilizing the matching between the guide button arranged on the piston mechanism and the rotating piece, when the rotating piece is screwed into the concave surface of the fixing piece, the two bending ends of the fixing piece are opened and respectively abut against the hole in the anchorage device and the steel bar, so that the fixing effect is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is an exploded view of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of the working state of a metal steel bar in the embodiment of the invention;
FIG. 3 is a schematic view showing an installation sequence of the working mechanism in the embodiment of the present invention;
FIG. 4 is a side sectional view of a working anchor according to an embodiment of the present invention;
FIG. 5 is an exploded view of the work fixture in an embodiment of the present invention;
FIG. 6 is a schematic view of a work fixture according to an embodiment of the present invention in a motion configuration when inserted into a work anchor;
FIG. 7 is a schematic cross-sectional side view of a locking structure of a work fixture in accordance with an embodiment of the present invention;
FIG. 8 is a partial side view cross-sectional structure of a rotor in an embodiment of the invention;
FIG. 9 is a schematic view of FIG. 8 taken at A in accordance with an embodiment of the present invention;
FIG. 10 is a schematic view illustrating a moving state of a guide button according to an embodiment of the present invention;
FIG. 11 is a partial side cross-sectional view of a guide button according to an embodiment of the present invention.
The reference numerals in the drawings denote: 1. pre-embedding a mechanism; 11. an anchor backing plate; 111. perforating; 12. A limiting plate; 2. a locking mechanism; 21. a working anchor; 211. a taper hole; 212. an annular cavity; 22. A working clamp; 221. a fixing member; 222. a groove; 223. a tab; 224. rotating the sheet; 2241. a rotating part; 2242. a contact part; 2243. an arc-shaped slot; 2244. a guide portion; 2245. a bending section; 225. an outer frame body; 3. a piston mechanism; 31. a guide knob; 32. a contact piece is abutted; 321. a jack; 322. a fixing plate; 323. a limiting hole; 324. a spring; 4. a tool anchorage; 41. a tool holder.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
Example (b):
no matter in the course of working or the practical application of metal rod iron (strip, muscle, hank), need pass through external force to pull to the body of rod iron, add pulling force in advance in the body component, produce certain deformation, respond to the load that structure itself received to effectively improve the bending resistance and the rigidity of rod iron body.
At present, the general method is to fix one side of a metal steel bar, to sleeve the outside of the steel bar by an anchor backing plate and to embed the steel bar on a flat end surface, and to correspondingly sleeve a working anchor on the steel bar in sequence, to insert a working clamp into each hole of the working anchor, and to apply traction force to the steel bar by a piston mechanism (usually, a special jack) to achieve the effect of tension.
In the practical process, the surface contour patterns of the outer side of the steel bar combined with actual needs are different, so that in the tensioning process, the friction force between the steel bar and the anchoring structure is insufficient, the anchoring structure slides and shifts, and the tensioning effect is influenced.
To this end, with reference to fig. 1-11, a stretching machine for a metal steel bar is proposed, which aims to increase the adhesion force between the metal steel bar and the steel bar when applying a traction force to the steel bar, and ensure the stretching effect, specifically, the whole device comprises three parts, namely a pre-embedded mechanism 1, a locking mechanism 2 and a piston mechanism 3, in the pre-preparation of stretching, a flat end surface for fixing the steel bar needs to be prepared, the steel bar is inserted into the end surface, an anchor backing plate 11 is embedded on the end surface to provide guiding insertion for the steel bar, the end surface of the anchor backing plate 11 is provided with through holes 111, the steel bar to be processed can be inserted into the through holes 111, nine through holes 111 in the embodiment are provided, and the stretching of nine steel bars can be simultaneously performed.
After cleaning up sand grains and other dirt with holes on the end face, installing a working anchor 21 on one side of an anchor backing plate 11, arranging a taper hole 211 for inserting a steel bar on the end face of the working anchor 21, inserting the steel bar into the taper hole 211 in a one-to-one correspondence manner, sleeving a working clamp 22 on the outer side of the steel bar and then extruding the steel bar into the taper hole 211, arranging a limiting ring with the diameter larger than that of the taper hole 211 at the tail end of the working clamp 22 in the extruding process, completely extruding the working clamp 22 into the taper hole 211 through knocking or other manners, arranging an annular cavity 212 on the inner wall of the taper hole 211, smoothing the inner wall of each taper hole 211, and easily extruding the working clamp 22 in the extruding process until a protruding piece 223 on the working clamp 22 is popped up to a preset fixed position along with the bent end on one side of a fixing piece 221, and judging whether the fixing piece 221 reaches the fixing piece 212 through judging crisp 'clicking'.
It should be noted that, in the present embodiment, one end of the fixing element 221 is connected to the inner wall of the groove 222, during the process of inserting the metal steel bar (rib, twisted rope), the bending end of the fixing element 221 facing the steel bar will not abut against the steel bar, and a certain abutting force exists between the bending end facing one side of the tapered hole 211 and the inner wall of the tapered hole 211, but the inner wall of the tapered hole 211 is smooth, when reaching the annular cavity 212, the bending end pops out but does not abut against the inner wall of the annular cavity 212, but a protruding piece 223 is installed at the bending end facing the inner wall of the tapered hole 211, the cross section of the side end of the protruding piece 223 is triangular, and the protruding piece 223 will intersect with the side wall of the annular cavity 212 along with the popping up of the bending end and dislocate, and will not easily receive the pulling force to retract.
In actual use, the tapered hole 211 may be made into a circular truncated cone shape, and after the circular truncated cone-shaped work fixture 22 is extruded, a fixing effect is achieved, and the technology of the piston mechanism 3 pulling the steel bar is well known in the prior art, and this embodiment is not described in detail, and is not shown in detail in the drawings.
The included angle between the inclined plane of the protruding piece 223 and the inner wall section of the tapered hole 211 in this example is an obtuse angle, when the working clamp 22 is pushed in, the contact area between the inclined plane of the protruding piece 223 and the inner wall section of the tapered hole 211 is small, the friction force is limited, after the fixing piece 221 reaches the vicinity of the annular cavity 212, the two bending ends of the fixing piece 221 are unfolded through the rotation of the rotary piece 224, the angle between the protruding piece 223 and the cross section of the annular cavity 212 in the direction close to the tapered hole 211 changes and approaches to parallel contact, and the anti-slip threads are distributed on the end face attached to the inner wall of the tapered hole 211, so that the fixing effect is further improved.
In addition, after the extrusion process of the working anchor 22 is completed, a circle of cylindrical limiting plate 12 is sleeved on one side of the working anchor 21, the limiting plate 12 and the working anchor 21 are kept on the same axis, one end of the piston mechanism 3 is sleeved on the outer side of the limiting plate 12, it is noted that the same locking mechanism 2 is installed on the other side of the piston mechanism 3, the installation process and the sequence are the same as those of the locking mechanism 2, the tool anchor 4 to be installed and the working anchor 21 have the same size and the same shape (the annular cavity 212 is not arranged on the hole wall inside the tool anchor 4), because the annular cavity 212 is not arranged inside the tool anchor 4, when the tool anchor 41 is disassembled, the tool anchor 4 can be directly pulled out from the hole of the tool anchor 4, and the annular cavity 212 is arranged inside the working anchor 4, so that the tool anchor 4 has a certain limiting capability, and the tool anchor 4 can be quickly separated from the whole tensioning equipment and can be used for multiple times.
Meanwhile, the tool clamp 41 and the working clamp 22 are the same in size and shape and the same in installation direction, a special jack for tensioning is adopted in the embodiment of the piston mechanism 3, for the prior art, the specific working process is not described in detail, the purpose of traction is mainly achieved, other structures can be used for replacing an internal tensioning oil pump to feed oil to an oil inlet in the actual use process, the piston is enabled to move forwards under the pushing action of high-pressure oil, and the steel bar is driven to move under the action of the tool anchor 4, so that the steel bar can be tensioned.
And when piston mechanism 3 overlaps in the limiting plate 12 outside, the guide button 31 on the conflict piece 32 that sets up in piston mechanism 3 can cooperate with the rotor 224 that sets up on the jig 22 one by one, let rotor 224 carry out certain angle's rotation, conflict portion 2242 on the rotor 224 can be in precession the concave surface of mounting 221 along with the rotation of rotation portion 2241 this moment, and because the position that conflict portion 2242 precession mounting 221 concave surface increases along its direction of rotation thickness gradually, let two bending ends of mounting 221 expand, and contradict respectively in rod iron and taper hole 211 inner wall department.
The locking mechanism 2 comprises a working anchor 21 and a working clamp 22 which are sequentially arranged on one side of the anchor backing plate 11, the working clamp 22 is sleeved on the steel bar and is inserted into the taper hole 211, and the piston mechanism 3 is abutted on one side of the working clamp 22 and drives the steel bar to move towards the opposite direction of the working clamp 22.
The work fixture 22 in this embodiment mainly includes two parts, which are a circular truncated cone-shaped outer frame 225 with a circular truncated cone-shaped cavity inside and a rotary plate 224 rotatably installed in the outer frame, the rotary plate 224 is rotatably installed in the outer frame 225, an arc-shaped groove 2243 is formed in an end surface of the rotary plate 224, which is located on a side away from the anchor pad 11, the arc-shaped groove 2243 includes a guide part 2244 and a curved part 2245, the guide part 2244 extends from one end of the rotary plate 224, which faces the piston mechanism 3, in a radial direction of the work anchor 21, and the curved part 2245 is curved from a side of the guide part 2244 in a tangential direction of the rotary part 2241.
When piston mechanism 3 is cup jointed toward the removal of work fixture 22 direction, install one in the piston mechanism 3 and support contact piece 32, offer the jack 321 corresponding with taper hole 211 on the contact piece 32, a fixed plate 322 is installed perpendicularly respectively to one side of every jack 321, the direction knob 31 is installed perpendicularly in the vertical side of fixed plate 322 and along with piston mechanism 3 injects the arc wall 2243 when moving toward rotor 224 direction, thereby along with lasting the insertion, direction knob 31 can be to the cell wall application of force of arc wall 2243, let rotor 224 carry out the rotation of certain angle, after rotor 224 takes place to rotate, one side of rotor 224 can precession the concave surface of mounting 221, prop open two ends of buckling, and contradict respectively on downthehole wall and steel bar.
Three grooves 222 are radially formed in the outer side end of the outer frame body along the steel rod, the three grooves 222 are circumferentially distributed in the outer side of the outer frame body, a fixing piece 221 is arranged in each groove 222, the fixing piece 221 is of a bent plate-shaped structure, the intersection point is arranged on the groove wall of each groove 222, the force application point of one bending end faces the steel rod, the other bending end is arranged on the outer side of each groove 222 and can abut against the hole wall in the taper hole 211, and the adhesive force to the steel rod is increased.
In this embodiment, a contact piece 32 is fixedly installed in the piston mechanism 3, the contact piece 32 is provided with insertion holes 321 corresponding to the tapered holes 211, one side of each insertion hole 321 is vertically installed with a fixing plate 322, the guide button 31 is vertically installed at the vertical side of the fixing plate 322 and inserted into the arc-shaped groove 2243 when the piston mechanism 3 moves towards the direction of the rotary piece 224, the bottom end of the guide button 31 is hemispherical, the tail end of the bending part 2245 is smoothly polished, when the piston mechanism 3 is required to be disassembled, the guide button 31 is rotated out from one side of the bending part 2245 by forcibly rotating the piston mechanism 3 at a certain angle, at this time, the piston mechanism 3 is pulled out in the direction opposite to the installation direction, the working clamp 22 does not move too much and is difficult to be loosened from the working anchor 21.
In the actual use process, the working anchor 21 can be replaced by the tool anchor 4 in the prestress processing process of the steel bar, so that the two working anchors 21 can be extracted from the outer side of the steel bar, the extraction principle of the working clamp 22 is the same as that of the tool clamp 41, and redundant description is not repeated herein; when the tensioning construction process of a bridge or a building is carried out, the working anchorage 21 and the tool anchorage 4 can be matched for use, after the tensioning construction is completed, the piston mechanism 3 is drawn out from one side of the working anchorage 21, and concrete is injected into a hole in which a steel bar (strand) is placed (the working anchorage 21 and the working clamp 22 are not taken out).
And the matched with between the instrument ground tackle 4 that is located piston mechanism 3 opposite side and the tool holder 41 supports contact piece 32 can dismantle on piston mechanism 3, thereby can will support contact piece along the opposite direction of installation direction to carry out the direction removal (extract) to contact piece 32, at the extraction in-process, let the rotor 224 antiport that sets up on the tool holder 41, thereby the guide button 31 that moves to flexion 2245 department can return, at the in-process that draws back, rotor 224 structure in the tool holder 41 can break away from with the concave surface of mounting 221, no longer extrude mounting 221, thereby can be convenient extract tool holder 41 from the downthehole of instrument ground tackle 4, can carry out secondary use.
While the work anchorage 21 and the work clamp 22 remain firmly fixed after use.
Preferably, in this embodiment, the guide knob 31 is movably connected to the fixing plate 322, a limiting hole 323 is formed on a plate surface of the fixing plate 322, one side of the guide knob 31 is inserted into the limiting hole 323, and a spring 324 is disposed between the guide knob and the limiting hole 323, so that the guide knob 31 can be easily retracted into the fixing plate 322 when the working anchor 21 and the piston mechanism 3 are removed.
In addition, in various application scenarios, for example, in the tensioning of steel strand ropes (prestressed tendons) in a construction site, the corresponding anchor backing plate 11, the working anchorage 21 and the working fixture 22 required for installation can be sequentially installed in the annular hole formed in the concrete surface, and when the steel bar is machined or subjected to deep pre-stress machining, the device can be flexibly matched with the steel bar for use, so that the use scenarios are various, and in addition, the one-end tensioning process and the two-end tensioning process are known technologies, and are not described in detail herein.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A tensioning machine for metal steel bars, characterized in that it comprises:
the pre-embedding mechanism comprises an anchor backing plate embedded on the flat end face, and a through hole is formed in the end face of the anchor backing plate and used for inserting a steel bar to be processed;
the locking mechanism comprises a working anchor and a working clamp which are sequentially arranged on one side of the anchor backing plate, a taper hole for inserting the steel bar is formed in the end face of the working anchor, and the working clamp is sleeved on the outer side of the steel bar and inserted into the taper hole;
the piston mechanism is abutted against one side of the working clamp and drives the steel bar to move towards the opposite direction of the working clamp;
the working fixture comprises a working fixture, a steel bar, a groove, fixing pieces and a conical hole, wherein the working fixture is positioned on the working fixture and radially communicated with the groove along the steel bar, the fixing pieces capable of deforming along the circumferential direction of the working fixture are distributed in the groove, the whole fixing pieces are of bent plate-shaped structures, one force application point of one bent end faces the steel bar, and the other bent end is arranged on the outer side of the groove and can abut against the hole wall in the conical hole.
2. A tensioning machine for metal steel bars according to claim 1, characterized in that said work fixture comprises:
the rotary piece is integrally in a round table shape with a round table-shaped cavity arranged inside, the rotary piece is rotatably installed in the working clamp, one side of the rotary piece can be screwed into the concave surface of the fixing piece, and force is applied to the corresponding end surfaces of the two bending ends.
3. A tensioning machine for metal steel bars according to claim 2, characterized in that said rotary plate comprises:
the rotating part is concentric and coaxial with the working clamp and is matched with the piston mechanism to rotate in the working clamp;
the collision part is integrally in a T-shaped structure and is arranged on one side of the rotating part, and the short arm end of the collision part can be screwed into the concave surface of the fixing part along with the rotation of the rotating part;
the thickness of the part of the interference part screwed into the concave surface of the fixing piece is gradually increased along the rotating direction.
4. A stretch-draw machine for metal steel bars according to claim 3, characterized in that an arc-shaped slot is opened at the outer side end of the rotation part, said arc-shaped slot comprising:
the guide part is extended from one end of the rotary sheet of the guide part, which faces to the piston mechanism, to the axial direction of the working anchorage device;
a bending part which is bent from one side of the guide part to the tangential direction of the rotating part;
the piston mechanism is provided with a guide button which can be inserted into the arc-shaped groove, and the guide button can axially move in the arc-shaped groove towards the direction of the working anchor.
5. A tensioning machine for metal steel bars according to claim 4, characterized in that a resisting piece is fixedly arranged in the piston mechanism, inserting holes corresponding to the taper holes are formed in the resisting piece, a fixed plate is vertically arranged on one side of each inserting hole, and the guide button is vertically arranged on the vertical side of the fixed plate and inserted into the arc-shaped groove along with the movement of the piston mechanism towards the direction of the rotary piece.
6. A tensioning machine for metal steel bars according to claim 5 characterized in that the bottom end of the guiding knob is hemispherical and the end of the curved part is smoothly ground.
7. A tensioning machine for metal steel bars according to claim 5, characterized in that the guide knob is movably connected with the fixed plate, a limiting hole is arranged on the plate surface of the fixed plate, one side of the guide knob is inserted into the limiting hole, and a spring is arranged between the guide knob and the limiting hole.
8. A tensioning machine for metal steel bars according to claim 5, characterized in that said fixing piece also comprises a lug, an annular cavity is opened in said conical hole, said lug is mounted on the fixing piece on the end surface of one side facing the inner wall of the conical hole, the cross section of the side end is triangular, and the inclined surface of the lug is distributed with anti-skid threads, and the side end of the lug intersects with the side wall of the annular cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210980305.8A CN115324356B (en) | 2022-08-16 | 2022-08-16 | Stretching machine for metal steel bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210980305.8A CN115324356B (en) | 2022-08-16 | 2022-08-16 | Stretching machine for metal steel bar |
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| CN115324356A true CN115324356A (en) | 2022-11-11 |
| CN115324356B CN115324356B (en) | 2023-08-22 |
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| CN211815638U (en) * | 2020-04-01 | 2020-10-30 | 郭晓 | Prestressed steel strand tensioning anchorage device for bridge construction |
| CN214656391U (en) * | 2020-12-22 | 2021-11-09 | 河南鑫荣重工有限公司 | Prestressed anchorage device steel strand stretching device |
| CN114439523A (en) * | 2021-12-28 | 2022-05-06 | 杭州图强工程材料有限公司 | Expansion shell type anchoring head and anchor rod |
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| CN115324356B (en) | 2023-08-22 |
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