CN218674536U - Horizontal tensile machine - Google Patents
Horizontal tensile machine Download PDFInfo
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- CN218674536U CN218674536U CN202222980688.7U CN202222980688U CN218674536U CN 218674536 U CN218674536 U CN 218674536U CN 202222980688 U CN202222980688 U CN 202222980688U CN 218674536 U CN218674536 U CN 218674536U
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Abstract
The utility model relates to a horizontal pulling force machine, characteristics are: the fixed end plate is arranged at the right side end in the rack, and a servo motor installation box is fixedly arranged at the left side end in the rack; the beam driving mechanism adopts two groups of screw nut transmission mechanisms driven by a servo motor, the two groups of screw nut transmission mechanisms are arranged in parallel front and back, the left ends of two screws are in driving connection with the servo motor, and two nuts are fixedly arranged on the movable beam in a penetrating way; the movable cross beam and the fixed end plate are oppositely arranged in parallel; the fixed end clamping pliers and the movable end clamping pliers are provided with V-shaped jaws which can be oppositely arranged in an opening and closing manner; the fixed end clamping pliers are fixedly arranged on the inner side of the fixed end plate in a mode that the jaw faces left; the movable end clamping pincers are arranged on the right side of the movable cross beam in a mode that the jaw faces rightwards, a connecting shaft is fixed at the left end of the movable end clamping pincers, the connecting shaft penetrates through a shaft hole formed in the middle of the movable cross beam, and a force measuring sensor is fixedly arranged on the connecting shaft and located on the left side of the movable cross beam in a penetrating mode. The tensile machine improves the detection precision of the friction force of the steel strand.
Description
Technical Field
The utility model belongs to the frictional force test equipment between the sheath of unbonded steel strand wires product and the steel strand wires, concretely relates to horizontal pulling force machine.
Background
In the use process of the unbonded steel stranded wire, different requirements are imposed on the friction force between the sheath and the steel stranded wire due to different use methods. For example, the unbonded steel strand sheath used as the external cable is not in contact with the surrounding environment in the construction process, so that the sheath is required to firmly cover the surface of the steel strand to form a protective sheath for isolating air, and the friction between the sheath and the steel strand is required to be relatively large. And when the unbonded steel strand is prefabricated in concrete, after the concrete is solidified and needs to be subjected to post-tensioning, the sheath and the steel strand need to be lubricated well so as to be subjected to tensioning construction. In the construction scheme of the unbonded steel stranded wire developed abroad in recent years, higher requirements are put forward on the friction force and the shock resistance between a sheath of the unbonded steel stranded wire product and the steel stranded wire, and particularly, the unbonded steel stranded wire used in the construction of a nuclear power station requires that factory inspection including a sheath drop weight test and a sheath friction force test is carried out on the unbonded steel stranded wire product.
The existing sheath friction force test equipment is a vertical tensile machine, the sheath friction force test carried out by the vertical tensile machine can be influenced by factors such as product gravity, and particularly under the condition that the friction force is small, for example, under the condition that only 60N exists, the measurement result is inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's weak point, providing a furthest's reduction to frictional resistance's adverse effect factor, improve the horizontal pulling force machine of frictional force detection precision.
The above object of the present invention is achieved by the following technical solutions:
the horizontal tensile machine is characterized in that: the device comprises a frame, a movable cross beam, a fixed end plate, a cross beam driving mechanism, a force measuring sensor, fixed end clamping pincers and movable end clamping pincers;
the rack is of a rectangular frame structure, the fixed end plate is arranged at the right side end position in the rack, and the servo motor installation box is fixedly arranged at the left side end position in the rack;
the beam driving mechanism adopts two groups of screw nut transmission mechanisms driven by a servo motor, the servo motor is fixedly arranged in a servo motor installation box, the two groups of screw nut transmission mechanisms are arranged in parallel front and back, two ends of two screws are respectively rotatably supported on the inner side wall and the fixed end plate of the servo motor installation box, the left ends of the two screws are connected with the servo motor through the transmission mechanisms, and the two nuts are fixedly arranged on the movable beam in a penetrating way;
the movable cross beam is of a vertical plate structure, and the movable cross beam and the fixed end plate are oppositely arranged in parallel;
the fixed end clamping pliers and the movable end clamping pliers are provided with V-shaped jaws which are oppositely arranged and can be opened and closed; the movable end clamping pliers are arranged on the right side of the movable cross beam in a mode that the jaws face rightward, a connecting shaft is fixed at the left end of the movable end clamping pliers, the connecting shaft penetrates through a shaft hole formed in the middle of the movable cross beam, and the force measuring sensor is fixedly arranged on the left side, located on the connecting shaft, of the movable cross beam in a penetrating mode.
Further: the two groups of sliding rails are formed by an upper circular sliding rod and a lower circular sliding rod, two ends of each circular sliding rod are fixedly connected with the inner side wall of the servo motor installation box and the fixed end plate respectively, and the two groups of sliding rails are in penetrating type guiding fit with the front end portion and the rear end portion of the movable cross beam respectively.
Further: the fixed end clamping pliers and the movable end clamping pliers both adopt a flat push type clamping pliers structure and comprise U-shaped pliers bodies, two jaw clamping blocks, two clamping driving screw rods, guide rods and pliers handles;
the two jaw clamping blocks are oppositely arranged in the U-shaped plier body, the inner end parts of the two jaw clamping blocks form guiding fit with guide rods vertically fixed on two sides of the U-shaped plier body through guide holes, the outer sides of the two jaw clamping blocks close to the middle part are respectively and vertically connected with a rotatable clamping driving screw rod, and the two clamping driving screw rods are respectively connected with threaded holes arranged on two sides of the U-shaped plier body; v-shaped grooves are oppositely arranged on the inner sides of the two jaw clamping blocks, V-shaped clamping pieces are fixedly attached in the V-shaped grooves, and V-shaped jaws which are oppositely arranged are formed between the V-shaped clamping pieces on the two sides; the clamp handle is fixedly arranged outside the bottom end of the U-shaped clamp body, and a connecting shaft insertion hole is formed in the outer end of the clamp handle.
The utility model has the advantages of and positive effect:
1. the utility model discloses a stiff end centre gripping pincers, expansion end centre gripping pincers carry out the centre gripping to the sheath end and the naked steel strand wires end of steel strand wires respectively to exert the pulling force along the horizontal direction, the pulling force direction is perpendicular with the gravity direction, has avoided gravity to the experimental adverse effect of pulling force, especially to the less condition of naked steel strand wires and sheath frictional force, has improved the accuracy that frictional force detected.
2. The utility model discloses stiff end centre gripping pincers and expansion end centre gripping pincers adopt flat-pushing formula centre gripping pincers structure, carry out the in-process that presss from both sides tightly to steel strand wires, and the effort can not produce the effort along steel strand wires axial direction along the radial direction of steel strand wires to avoided pressing from both sides tightly and the experimental error that produces, guaranteed the accuracy that frictional force detected.
Drawings
FIG. 1 is a top view of the overall structure of the present invention;
FIG. 2 isbase:Sub>A partial sectional view A-A of FIG. 1;
FIG. 3 is a schematic diagram of the structure of the pliers of FIG. 1;
fig. 4 is a schematic view of fig. 3 in the direction B.
Detailed Description
The structure of the present invention will be further explained by embodiments with reference to the accompanying drawings. It is to be understood that this embodiment is illustrative and not restrictive.
A horizontal tensile machine, please refer to fig. 1-4, the invention points are: the device comprises a frame 1, a movable cross beam 7, a fixed end plate 9, a cross beam driving mechanism, a force measuring sensor 15, fixed end clamping pincers 11 and movable end clamping pincers 13.
The frame is of a rectangular frame structure. The fixed end plate is arranged at the right end position in the frame. The servo motor installation box 2 is fixedly installed at the position of the left side end in the rack, specifically, a bracket is fixedly installed at the left side end in the rack, and the servo motor installation box is placed on the bracket and is fixed.
The beam driving mechanism comprises a servo motor 3, two transmission screw rods 5 and two groups of sliding rails. Servo motor fixed mounting is in the servo motor install bin, two drive screw along left right direction parallel arrangement in the frame near the position of front side and rear side, in the inboard lateral wall that two drive screw's one end were worn through the servo motor install bin stretched into the servo motor install bin, the other end of two drive screw passes through the rotatable formula of bearing frame and supports on the stiff end plate. One end of each of the two transmission screw rods extending into the servo motor installation box is in driving connection with the output end of the servo motor through the belt and belt wheel matched transmission mechanism 4 or the gear transmission mechanism, and the transmission directions of the two transmission screw rods are consistent.
Two sets of slide rails constitute by two circle slide bars 6, two sets of slide rails respectively with two driving screw cooperations, two slide bars of every group slide rail set up respectively in the top and the below that correspond driving screw, the one end of two slide bars and the inside wall fixed connection of servo motor install bin, the other end and the stiff end plate fixed connection of two slide bars, the mode that specifically can adopt is: the flange sleeves can be fixed at the two ends of the sliding rod, and the fixed installation of the end part of the sliding rod is realized through the flanges.
The movable cross beam is of a vertical plate structure, a front nut mounting hole and a rear nut mounting hole are formed in the movable cross beam, a nut 8 is fixedly mounted in each nut mounting hole, and the two nuts are respectively matched with the two transmission screws to form two groups of screw nut transmission mechanisms. Two upper and lower guide through holes are respectively arranged on the movable cross beam close to the front side and the rear side, sliding sleeves are fixedly arranged in the two guide through holes, and the two guide through holes respectively form sliding guide fit with the two sliding rods on the corresponding sides through respective sliding sleeves.
One of the fixed end clamping pincers and the movable end clamping pincers is used for clamping and removing a section of sheath of the steel strand (a steel bar with the diameter equal to that of the steel strand needs to be inserted into the sheath), and the other one of the fixed end clamping pincers and the movable end clamping pincers is used for clamping and removing a section of bare steel strand of the sheath.
The fixed end clamping pincers and the movable end clamping pincers are provided with V-shaped jaws which are oppositely arranged and can be opened and closed, and the fixed end clamping pincers and the movable end clamping pincers clamp and fix the sheath end and the bare steel strand end through the V-shaped jaws which are oppositely arranged.
The fixed end clamping pincers are fixedly arranged on the inner side of the fixed end plate in a mode that a jaw faces left, the movable end clamping pincers are arranged on the right side of the movable cross beam in a mode that the jaw faces right, a connecting shaft 14 is fixed to the left end of the movable end clamping pincers, the connecting shaft penetrates through a shaft hole formed in the middle of the movable cross beam, and the force measuring sensor is fixedly arranged on the left side, located on the connecting shaft, of the movable cross beam in a penetrating mode and used for detecting time tension.
The fixed end clamping pliers and the movable end clamping pliers can adopt a wedge-shaped rabbet type clamping pliers structure on the existing vertical tensile machine. However, due to the clamping manner of the wedge-shaped clamp, axial force can be generated on the sample, so that certain test errors are generated, and the minimum test errors are ensured. The utility model discloses in, the equal preferred flat pushing-type centre gripping pincers structure of stiff end centre gripping pincers and expansion end centre gripping pincers, it is concrete, press from both sides tight drive screw 20, guide arm 19, pincers handle 16 including U type pincers body 17, two grip blocks 21, two of keeping silent.
The guide rod is arranged in the U-shaped pliers body, two ends of the guide rod are fixedly connected with two sides of the U-shaped pliers body in a penetrating mode, the two jaw clamping blocks are oppositely arranged in the U-shaped pliers body in parallel, and guide holes are formed in the inner ends of the jaw clamping blocks and matched with the guide rod in a penetrating mode through the guide holes. V-shaped grooves are oppositely formed in the inner sides of the two jaw clamping blocks, V-shaped clamping pieces 22 are fixedly attached in the V-shaped grooves in an attached mode, and oppositely-arranged V-shaped jaws are formed between the V-shaped clamping pieces on the two sides. Two sides of the U-shaped clamp body are respectively provided with a threaded hole, the two threaded holes and the two clamping driving screw rods form threaded penetrating fit, the inner ends of the two clamping driving screw rods are respectively connected with the outer sides of the two jaw clamping blocks in a mode of axial line limiting in a relatively rotating mode, and the two clamping driving screw rods are used for driving the two jaw clamping blocks to realize horizontal pushing movement. The outer ends of the two clamping driving screw rods are vertically connected with a driving rod 18 in a penetrating manner respectively, and the driving rod is used for driving the clamping driving screw rods to rotate. The clamp handle is fixedly arranged outside the bottom end of the U-shaped clamp body, and a connecting shaft insertion hole is formed in the outer end of the clamp handle. A connecting shaft jack of the movable end clamping pliers is fixedly connected with one end of a connecting shaft in an inserted manner; the connecting shaft jack of the fixed end holding clamp is fixedly connected with a flange shaft 10 in an inserting way and is fixedly connected with the fixed end plate through a flange.
The principle of testing the friction force between the sheath of the unbonded steel strand product and the steel strand by adopting the horizontal tensile machine is as follows:
presetting the position of a movable end clamping clamp according to the length of a steel strand segment 12 to be detected, so that the distance between the movable end clamping clamp and a fixed end clamping clamp is consistent with the length of the steel strand to be detected; then inserting a steel bar with the same outer diameter as the bare steel strand into the sheath end of the steel strand to be detected, and clamping and fixing the steel bar and the sheath in a relative V-shaped jaw of the fixed end clamping pliers; then, the bare steel strand end of the steel strand to be detected is clamped and fixed in a relative V-shaped jaw of the movable end clamping pliers, after two ends of the steel strand to be detected are clamped and fixed, a servo motor is started, the movable cross beam is driven to move leftwards through the two groups of screw and nut mechanisms, the force sensor is tightly pressed on the left side of the movable cross beam, pulling force is transmitted to the movable end clamping pliers through the connecting shaft, the sheath is elastically deformed by the pulling force, when the elastic deformation force is larger than static friction force between the sheath and the bare steel strand, the sheath and the bare steel strand move relatively, the static friction is changed into dynamic friction, and after the movable cross beam moves for a set distance, the servo motor stops. In the process, the numerical value of the friction force between the reaction sheath and the bare steel strand is timely uploaded to a display screen of a control system of the horizontal tensile machine through a force transducer, and a peak value in the test process is observed through the display screen, wherein the peak value is the maximum static friction force between the bare steel strand and the sheath.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the scope of the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (3)
1. The horizontal tensile machine is characterized in that: the device comprises a frame, a movable cross beam, a fixed end plate, a cross beam driving mechanism, a force measuring sensor, fixed end clamping pincers and movable end clamping pincers;
the rack is of a rectangular frame structure, the fixed end plate is arranged at the right side end position in the rack, and the servo motor installation box is fixedly arranged at the left side end position in the rack;
the beam driving mechanism adopts two groups of screw nut transmission mechanisms driven by a servo motor, the servo motor is fixedly arranged in a servo motor installation box, the two groups of screw nut transmission mechanisms are arranged in parallel front and back, two ends of two screws are respectively rotatably supported on the inner side wall and the fixed end plate of the servo motor installation box, the left ends of the two screws are connected with the servo motor through the transmission mechanisms, and the two nuts are fixedly arranged on the movable beam in a penetrating way;
the movable cross beam is of a vertical plate structure, and the movable cross beam and the fixed end plate are oppositely arranged in parallel;
the fixed end clamping pliers and the movable end clamping pliers are provided with V-shaped jaws which are oppositely arranged and can be opened and closed; the movable end clamping pliers are arranged on the right side of the movable cross beam in a mode that the jaws face rightwards, a connecting shaft is fixed at the left end of the movable end clamping pliers and penetrates through a shaft hole formed in the middle of the movable cross beam, and the force measuring sensor is fixedly arranged on the left side, located on the movable cross beam, of the connecting shaft in a penetrating mode.
2. The horizontal tensile machine of claim 1, wherein: the servo motor mounting box is characterized by further comprising two groups of sliding rails, wherein the two groups of sliding rails are composed of an upper circular sliding rod and a lower circular sliding rod, two ends of each circular sliding rod are fixedly connected with the inner side wall of the servo motor mounting box and the fixed end plate respectively, and the two groups of sliding rails are in penetrating type guide fit with the front end portion and the rear end portion of the movable cross beam respectively.
3. The horizontal tensile machine of claim 1, wherein: the fixed end clamping pliers and the movable end clamping pliers both adopt a flat-pushing type clamping pliers structure and comprise U-shaped pliers bodies, two jaw clamping blocks, two clamping driving screw rods, guide rods and pliers handles;
the two jaw clamping blocks are oppositely arranged in the U-shaped plier body in a row, the inner end parts of the two jaw clamping blocks form guide fit with guide rods which are vertically fixed on two sides of the U-shaped plier body through guide holes, the outer sides of the two jaw clamping blocks close to the middle part are respectively and vertically connected with a rotatable clamping driving screw rod, and the two clamping driving screw rods are respectively connected with threaded holes arranged on two sides of the U-shaped plier body; v-shaped grooves are oppositely arranged on the inner sides of the two jaw clamping blocks, V-shaped clamping pieces are fixedly attached in the V-shaped grooves, and V-shaped jaws which are oppositely arranged are formed between the V-shaped clamping pieces on the two sides; the clamp handle is fixedly arranged outside the bottom end of the U-shaped clamp body, and a connecting shaft insertion hole is formed in the outer end of the clamp handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222980688.7U CN218674536U (en) | 2022-11-09 | 2022-11-09 | Horizontal tensile machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222980688.7U CN218674536U (en) | 2022-11-09 | 2022-11-09 | Horizontal tensile machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218674536U true CN218674536U (en) | 2023-03-21 |
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ID=85537510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222980688.7U Active CN218674536U (en) | 2022-11-09 | 2022-11-09 | Horizontal tensile machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218674536U (en) |
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2022
- 2022-11-09 CN CN202222980688.7U patent/CN218674536U/en active Active
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