CN115749144A - Double-cone type steel bar connector and connecting method - Google Patents

Abstract

The invention discloses a double-cone type steel bar connector, which comprises: the clamping piece group is of a fusiform structure formed by a plurality of clamping pieces which are continuously arranged along the circumferential direction, and the interior of the fusiform structure is axially communicated and is provided with internal threads along the length direction; the two sleeves are symmetrically arranged at two ends of the clamping sheet group, any one sleeve is of a hollow frustum-shaped structure and coaxially sleeved at the end part of the clamping sheet group, and the connecting surfaces of the sleeves and the clamping sheet group are mutually attached. The invention also discloses a method for connecting the double-cone type steel bar connector and the steel bars at two ends by using the auxiliary installation tool. The invention realizes the stable connection of the reinforcing steel bars by the self-locking matching of the inclined planes of the conical sleeve and the shuttle-shaped clamping piece group with the engagement of the internal threads of the clamping piece group and the reinforcing steel bars, and can realize the semi-automatic connection of the reinforcing steel bars by combining with a matched auxiliary mounting tool, thereby effectively improving the connection precision and the working efficiency.

Description

Double-cone type steel bar connector and connecting method

Technical Field

The invention relates to the technical field of steel bar connection. More particularly, the present invention relates to a double-tapered reinforcing bar coupler and a coupling method.

Background

The prior standard type and the standard type derivative steel bar connector have the following defects in practical use:

1. the steel bar connection process is complex, the steel bar needs to be subjected to secondary processing such as upsetting, thread arrangement and the like, and auxiliary installation needs to be carried out in ways such as steel bar rotation or compression joint during butt joint, for example, in a thread assembly type steel bar connector in patent CN 214995273U, two connected steel bars need to be provided with threads at the ends thereof, the ends of the steel bars need to be additionally processed before the steel bars are connected, and a complex processing process is added, so that the working efficiency of the steel bar connector is low, and the steel bar connector cannot be widely applied to the situations that a steel bar sheet body, a part, a steel bar cage connection and the steel bar cannot rotate or the steel bar has deviation in the axial direction and the radial direction; for another example, in patent CN 216226695U, the crimping device supplies energy to the hydraulic cylinder, a hydraulic station needs to be arranged on a construction site, so that the construction cost is greatly increased, and although a limiting device is arranged, accurate extrusion cannot be completely realized, and the connection quality of the steel bars is easily affected;

2. the steel bar connector has a complex structure, if heat treatment or processing of various different threads, high-precision long chamfers and the like is required, for example, a rod connecting device in the patent CN 108049575A comprises a plurality of clamping pieces, a fastening device and other components, the structure of the integral steel bar connector is complex, so that the problems of complex process, difficult processing and the like exist in the manufacturing of the steel bar connector, and the cost of the integral steel bar connector is high; in addition, when the reinforcing steel bar connector is used for reinforcing steel bar connection, a manual installation mode is generally adopted, so that the problems of high labor intensity and low working efficiency exist when the workload is large, and the connection quality cannot be guaranteed.

In order to solve the above problems, it is necessary to design a novel steel bar connector and a connecting method, which can effectively control the construction cost while ensuring the connection quality and construction efficiency of the steel bars.

Disclosure of Invention

The invention aims to provide a double-cone type steel bar connector and a connecting method.

To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a double-tapered reinforcing bar connector, comprising:

the clamping piece group is of a fusiform structure formed by a plurality of clamping pieces which are continuously arranged along the circumferential direction, and the interior of the fusiform structure is axially communicated and is provided with internal threads along the length direction;

the two sleeves are symmetrically arranged at two ends of the clamping piece group, any one sleeve is of a hollow frustum-shaped structure and is coaxially sleeved at the end part of the clamping piece group, and the sleeve and the connecting surface of the clamping piece group are mutually attached.

Preferably, in the double-cone steel bar connector, the number of the clamping pieces in the clamping piece group is odd, and the shape of the connecting surface of any two adjacent clamping pieces conforms to a tangent function curve.

Preferably, the double-cone connector is formed by cutting the plurality of clips by a laser cutting device, and the laser cutting device comprises a rotary worktable, a clamping device and a clamping device, wherein the rotary worktable is used for positioning the clip group before cutting and driving the clip group to rotate around an axis; the two transverse sliding rails are arranged above and below the clamping piece group at intervals in parallel and fixed on the ground through a three-dimensional frame, and the two transverse sliding rails and the axis of the clamping piece group are positioned in the same vertical plane; the longitudinal sliding rail is vertically arranged between the two transverse sliding rails and is connected with the two transverse sliding rails in a sliding manner; the laser head is arranged on the longitudinal sliding rail and is in sliding connection with the longitudinal sliding rail, and the laser head is right opposite to the surface of the outer side wall of the clamping piece group.

Preferably, the laser cutting device further comprises a high-pressure water gun which is fixed right above the clamping piece group through the three-dimensional frame, and a spray head of the high-pressure water gun extends downwards into a through hole in the clamping piece group; the inner end part of the water chute is positioned right below the clamping piece group and is communicated with the inner through hole of the clamping piece group through the through hole on the rotary workbench; and the residue collection box is communicated with the outer end part of the water chute.

Preferably, in the double-cone connector, the internal thread of the clip set includes two internal threads, and the two internal threads are spaced apart from each other at two ends of the internal through hole of the clip set.

Preferably, in the double-cone steel bar connector, two ends of the clamping piece group respectively extend outwards along the axial direction to form a hollow cylindrical structure continuously arranged with the hollow frustum-shaped structure, and chamfers are arranged on the outer side wall and the inner side wall of the outer end part of the clamping piece group along the circumferential direction.

Preferably, in the double-cone connector, the sleeve is a tapered sleeve with the same wall thickness, and the inner and outer side walls of the tapered sleeve are smooth planes and are arranged in parallel.

The invention also provides a connecting method of the double-cone type steel bar connector, wherein the double-cone type steel bar connector and steel bars at two ends are connected by using an auxiliary mounting tool, and the auxiliary mounting tool comprises:

the box body is of a hollow structure, and one side of the box body is provided with a sliding groove communicated with the outside along the length direction;

the ball screw is arranged in the box body along the length direction of the sliding chute and is driven to rotate by a driving motor;

the two chucks are oppositely arranged at two ends of the sliding chute, each chuck comprises a first chuck, the fixed end of each first chuck is fixedly connected with the nut of the ball screw, and the clamping end of each first chuck extends out of the sliding chute and is in sliding connection with the sliding chute; the fixed end of the second chuck is fixedly connected with the box body, the clamping end of the second chuck extends outwards and is vertical to the side wall of the box body, and the clamping end of any chuck is sleeved on the steel bar to be connected at the same end and is in sliding connection with the steel bar to be connected;

a controller electrically connected with the driving motor.

Preferably, in the connection method of the double-cone type reinforcing steel bar connector, the auxiliary installation tool further comprises a limit switch disposed between the first clamping head and the box body and on the opposite side of the movement direction of the first clamping head, and the limit switch is used for recording the initial position of the first clamping head; the linear displacement sensor is arranged between the first chuck and the box body and positioned on one side in the same direction as the first chuck, and the linear displacement sensor is used for measuring the linear displacement of the first chuck;

the limit switch and the linear displacement sensor are electrically connected with the controller.

The invention at least comprises the following beneficial effects:

1. the tapered sleeve and the fusiform clamping piece form inclined surface self-locking, the stable connection of the reinforcing steel bar can be realized by matching the engagement action of the internal thread of the clamping piece and the reinforcing steel bar, the sleeve and the clamping piece have simple, reasonable and easy configurations, the reinforcing steel bar does not need to be additionally processed in advance when in use, and the fusiform design enables the clamping piece to be better aligned when being compressed and radially contracted, so that the axial and radial deviation of the reinforcing steel bar can be adapted, the connection quality is ensured, and the application range of the reinforcing steel bar connector is effectively expanded;

2. the invention adopts the conical sleeve with equal wall thickness, thereby further saving the processing time and processing material of the steel bar connector and controlling the processing cost;

3. according to the invention, the auxiliary mounting tool is designed aiming at the matching of the double-cone type steel bar connector, the steel bar connection process is controlled through the single chip microcomputer system, so that accurate and stable extrusion action can be realized, the semi-automatic connection of high-precision steel bars can be realized, the connection accuracy and the working efficiency are effectively improved, the auxiliary mounting tool adopts alternating current for energy supply, no pollution is caused, and the maintenance cost is low;

4. the laser cutting device is designed aiming at the matching of the double-cone type steel bar connector, the workbench is driven by the rotating mechanism to drive the workpiece to rotate, and then the workpiece is clamped and fixed, so that the workpiece can be cut efficiently, accurately and in multiple directions, the precision of the steel bar connector is ensured to meet the design requirement, and the steel bar connection quality is further ensured.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic view illustrating a connection structure between a double-cone connector and reinforcing bars at two ends according to an embodiment of the present invention;

fig. 2 is an exploded view of the double-cone connector according to the above embodiment;

FIG. 3 is a schematic view of the connection structure between the clip set and the reinforcing bars in the above embodiment;

FIG. 4 is a schematic structural view of the clip of the above embodiment;

FIG. 5 is a schematic cross-sectional view of the outer and inner portions of the sleeve in the above embodiment;

fig. 6 is a schematic structural diagram of the laser cutting device in the above embodiment.

Description of reference numerals:

101. a steel bar I to be connected; 102. a sleeve; 103. a clip set; 104. a steel bar II to be connected; 105. a first chuck; 106. a limit switch; 107. a reversing switch; 108. a handle I; 109. starting a switch; 110. a speed reduction mechanism; 111. a nut; 112. a linear displacement sensor; 113. a coupling; 114. a gear shaft; 115. a ball screw; 116. a drive motor; 117. a controller; 118. a handle II; 119. a second chuck; 201. a groove; 202. a straight cylinder; 203. a fillet is arranged in the end head; 204. an internal thread; 205. an end external fillet; 301. a sleeve wall; 302. chamfering the thin end of the sleeve; 303. chamfering the thick end of the sleeve; 501. a clamping piece I; 502. a sleeve I; 503. a clamping piece II; 504. a clamping piece III; 505. a sleeve II; 601. a laser head; 602. a longitudinal slide rail; 603. a transverse slide rail; 604. a high pressure water gun; 605. rotating the working table; 606. a water chute; 607. and a residue collection box.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 6, the present invention provides a double-tapered reinforcing bar coupler, including:

a clip set 103 having a shuttle-shaped structure formed by a plurality of clips continuously arranged in a circumferential direction, the interior of which is axially penetrated and has an internal thread 204 along a longitudinal direction;

the two sleeves 102 are symmetrically arranged at two ends of the clamping piece group 103, any one sleeve 102 is of a hollow frustum-shaped structure and is coaxially sleeved at the end part of the clamping piece group 103, and the connecting surfaces of the sleeves 102 and the clamping piece group 103 are mutually attached.

In the above technical solution, the outer surface of the whole clamping piece set 103 formed by combining the plurality of clamping pieces is similar to a date pit (i.e. a fusiform shape with two narrow ends and a wide middle), the inner through hole is cylindrical, the inner side wall is provided with the internal thread 204, and after the sleeve and the clamping piece set 103 are combined, the whole steel bar connector is also roughly fusiform. In the present embodiment, the internal thread 204 of the clip is processed into a trapezoidal thread with a thread angle of 55 ° and a thread pitch of 3.2mm; the shape and structure of the two sleeves are completely the same and the sleeves are symmetrically sleeved at two ends of the clamping piece group 103, the appearance of any sleeve is in a hollow round table shape, the difference of an upper mounting position and a lower mounting position is avoided, and in order to realize the mutual fit of the connecting surfaces of the sleeves and the clamping piece group 103, the inner wall of each sleeve is set to be a cone shape with the same slope as the slope of the inclined plane at the end part of the corresponding clamping piece. When the steel bar clamp is installed, two sleeves (a sleeve I502 and a sleeve II 505) are sleeved into the adjacent end parts of two steel bars to be connected (a steel bar I101 to be connected and a steel bar II 104 to be connected) respectively, then the axes of the two steel bars to be connected are aligned, a plurality of clamping pieces are assembled at the adjacent end parts of the two steel bars to be connected, the clamping piece set 103 is in a shuttle shape, two narrower outer end parts of the clamping piece set are correspondingly connected with the ends of the steel bar I101 to be connected and the end of the steel bar II 104 to be connected respectively, so that the two steel bars to be connected are connected together preliminarily, then the sleeves at the two ends are sleeved into the end parts of the clamping piece set 103 in a reverse direction respectively, and the preliminary positioning connection of the sleeve, the clamping piece and the steel bar from outside to inside is realized; then, the two sleeves are oppositely (inwards) extruded from the outside, so that the clamping piece positioned between the two sleeves (at the inner side) is pressed and deformed, the trapezoidal threads on the through hole in the clamping piece group 103 are extruded into the steel bar to be connected, the gripping force of the connector and the steel bar is increased, the internal threads 204 of the clamping piece bite into the steel bar at the moment, and then the oblique surface self-locking between the inner side wall of the sleeve and the outer side wall of the clamping piece group 103 is combined, so that the reliable and stable connection of the steel bar-clamping piece group-sleeve can be realized. Wherein, in order to guarantee that the inside thread 204 of the clamping piece can be squeezed into the steel bar to be connected in the extrusion process, the design internal diameter of the clamping piece group is smaller than the external diameter of the steel bar to be connected, in this case, in order to facilitate the installation of the clamping piece, the whole clamping piece group is cut into a plurality of clamping pieces, when the steel bar connector is installed with the steel bar, the split type clamping piece splicing sleeve can be easily arranged outside the steel bar at two ends, the sleeves at two ends are respectively used for locking the end parts of the clamping pieces which are separated from each other, when the clamping pieces are stably connected with the end parts of the steel bar through the internal thread, enough operation space is reserved for the opposite compression of the sleeves, along with the propulsion of the stroke of the inward compression of the sleeves, the extrusion force between the clamping pieces and the steel bar is gradually increased, and simultaneously the clamping pieces are synchronously tightened towards the axis direction, thereby, the steel bar connector structure can be suitable for the complex working condition that the steel bar to be connected cannot rotate or any one of the axial direction and radial deviation of the steel bar or the combination, and the connection quality (steel bar butt joint coaxiality) and the connection stability under different working conditions are guaranteed. In addition, in the manufacturing process of the steel bar connector, a novel processing technology is adopted, namely, a cutting die is used for directly cutting to obtain a required blank, and the production of assemblies such as clamping pieces and sleeves can be completed through post-processing technologies such as polishing and chamfering, so that the processing material and time are saved, the cost is saved, and the production efficiency is improved.

The steel bar connector has a simple structure, the number of components is small and precise, the steel bar connector only comprises a pair of sleeves and a set of clamping pieces, when the steel bar connector is used, two steel bars to be connected do not need to be preformed with screw threads, upset and the like, the steel bar connector can be directly connected, the steel bar connector is completely suitable for working conditions with axial and radial deviation, the steel bar connection quality is ensured, the application range of the steel bar connector is effectively expanded, and the construction cost (including the manufacturing, processing and connecting operation cost of the steel bar connector) is controlled.

In another technical solution, in the double-cone steel bar connector, the number of the clamping pieces in the clamping piece group 103 is odd, and the shape of the connecting surface of any two adjacent clamping pieces conforms to a tangent function curve. The number of the clamping pieces of the clamping piece set 103 is odd, 3, 5 or 7 clamping pieces can be selected according to actual construction conditions, the whole clamping piece set 103 is in a shuttle shape, the clamping pieces are formed by cutting the integrated clamping piece set 103 (in a shuttle-shaped hollow structure), as shown in fig. 2 and fig. 4, a cutting line between every two adjacent clamping pieces is a tangent function curve which is symmetrical relative to the middle position (up and down) of the clamping piece, a cutting angle (namely, an included angle of a cutting direction at a notch at the end part of the clamping piece relative to the horizontal direction) can be selected according to design requirements, and the horizontal direction relative to the cutting direction is a plane where the end surfaces of the clamping pieces are located. The clamping piece structure can better bear force in the process that sleeves at two ends are inwards compressed, the coaxiality of the clamping pieces is improved when the clamping pieces shrink inwards (in an axis) and compress the ends of internal steel bars, the connecting surfaces in the shape of a tangent function curve are adopted between the adjacent clamping pieces, the pressing force between the sleeves and the clamping pieces and the pressing force between the adjacent clamping pieces are dispersed to different positions and different directions of the connecting surfaces by the curved surfaces in the compression process, the stress structure of a single clamping piece is more reasonable, the problems of clamping piece deformation and the like caused by local and over-large unidirectional stress are also avoided, and therefore the stability of steel bar connection and the stress performance of the connected steel bars are improved.

Among the above-mentioned technical scheme, for providing the better clamping piece structural design of a joint effect, the reinforcing bar of connecting has carried out tensile test (sleeve and treat that the connecting reinforcement all adopts same size and structure) under the clamping piece group adopted different clamping piece quantity, cutting curve and the cutting angle condition, and experimental data is as shown in table 1.

TABLE 1 uniaxial tensile Property test data

According to the test data, when the cutting quantity of the clamping piece groups is the same, the tensile strength of the steel bar connected by the clamping piece groups cut by adopting the tangent function curve is obviously higher than that of the steel bar connected by the clamping piece groups vertically cut by adopting a straight line; in addition, when the cutting curves are the same (tangent function curve), the number of the clamping pieces is controlled to be three, and a better connecting effect can be obtained by adopting a 60-degree cutting angle, namely the tensile strength of the steel bar is the highest (736 MPa). Therefore, in this embodiment, the clip set 103 is cut into three clips (clip i 501, clip ii 503, clip iii 504) at equal ratio, and the cutting angle is set to 60 °, so as to obtain the best connection effect, i.e. the highest tensile strength after the steel bar is connected.

In another embodiment, the double-cone connector is formed by cutting the plurality of clips by a laser cutting device, and the laser cutting device includes a rotary table 605 for positioning and driving the clip set 103 before cutting to rotate around an axis; the two transverse sliding rails 603 are arranged above and below the clamping piece group 103 at intervals in parallel and fixed on the ground through a three-dimensional frame, and the two transverse sliding rails 603 and the axis of the clamping piece group 103 are located in the same vertical plane; a longitudinal slide rail 602 vertically disposed between and slidably connected to the two lateral slide rails 603; the laser head 601 is arranged on the longitudinal slide rail 602 and is in sliding connection with the longitudinal slide rail, and the laser head 601 is just opposite to the outer side wall surface of the clamping piece group 103.

Among the above-mentioned technical scheme, because the cutting shape of clamping piece is injectd to tangent function curve, if continue to adopt staff's manual cutting, the cutting curve nonconformity that appears easily, circumstances such as cutting accuracy is not enough lead to the atress can't reach the expectancy effect between the clamping piece, influence the reinforcing bar and connect the quality. Therefore, the invention provides a matched laser cutting device, a rotary worktable 605 can be fixed on the inner bottom surface of a three-dimensional frame to form an integrated structure, the movement of the integrated device is convenient, the rotary worktable 605 comprises a worktable plane, a rotary motor (optional common driving motor) is arranged in the middle of the worktable plane, a positioning tool is arranged on the worktable plane, the bottom of the positioning tool is fixedly connected with an output shaft of the rotary motor, and the top of the positioning tool is a structure which is matched and clamped with a clamping piece group to be cut, so that the clamping piece group 103 can be stably clamped on the positioning tool and is coaxially arranged with the positioning tool. The two transverse slide rails 603 are respectively arranged right above and below the positioning tool and distributed in an I shape with the longitudinal slide rail 602, and a structural groove communicated with the surface of the transverse slide rail 603 below is formed in the plane of the workbench, so that the longitudinal slide rail 602 can move on one side (along the radial extension line) of the to-be-cut clamping piece group 103. The transverse slide rail 603 and the longitudinal slide rail 602 form a linear guide rail pair, the longitudinal slide rail 602 and the laser head 601 also form a linear guide rail pair, the laser cutting device is provided with a control system (comprising an input panel), the longitudinal slide rail 602 and the laser head 601 can move on corresponding rails according to set speed and direction according to input instructions, and the rotating speed of the rotating motor is also controlled by the control system. The laser head 601 is provided with a laser generating device, and can directly face to a cutting surface (a clamping piece group to be cut) to emit laser for rapid cutting. During cutting, the positioning tool is driven to rotate by the rotating motor to drive the clamping piece group to be cut to integrally rotate, the position of the longitudinal slide rail 602 on the transverse slide rail 603 is controlled to be adaptable to different clamping piece group structure sizes, the position of the laser head 601 on the longitudinal slide rail 602 is controlled to cut the clamping piece group under a set track, the rotation of the positioning tool and the movement of the longitudinal slide rail 602 and the laser head 601 form a three-axis linkage mechanism, and rapid clamping piece cutting under different cutting requirements can be accurately realized. Above-mentioned laser cutting device simple structure, easily equipment, the staff only need can realize diversified, the semi-automatization cutting of clamping piece group according to design requirement input control instruction, has avoided the often manual adjustment of operating personnel, has improved the cutting efficiency of clamping piece and has guaranteed the structural accuracy of clamping piece itself to the connection effect to the reinforcing bar when having guaranteed to use steel bar connector to connect.

In another technical solution, the laser cutting device further includes a high-pressure water gun 604 fixed right above the clip set 103 through the three-dimensional frame, and a nozzle of the high-pressure water gun 604 extends downward into an inner through hole of the clip set 103; a water guide groove 606 provided at the bottom of the rotary table 605, an inner end portion of the water guide groove 606 being located directly below the clip set 103 and communicating with an inner through hole of the clip set 103 through a through hole on the rotary table 605; and a residue collection box 607 communicated with an outer end portion of the water guide groove 606. The laser cutting device is also provided with a high-pressure water gun 604, the outer end part of the high-pressure water gun 604 is connected with a high-pressure water source, and the inner end part of the high-pressure water gun 604 corresponds to the longitudinal axis of the clamping piece group to be cut and extends into the clamping piece group to be cut, so that high-pressure water vapor can be sprayed from the inside of the high-pressure water gun when the laser head 601 cuts a workpiece, and residues generated on the surface of the workpiece (clamping piece) which is just cut can be removed in time; and a telescopic mechanism is further arranged between the high-pressure water gun 604 and the three-dimensional frame, and the telescopic mechanism can drive the high-pressure water gun head to lift and descend so as to match with the cutting operation of the clamping piece sets with different sizes. Meanwhile, the bottom of the rotary workbench 605 is also provided with a residue collection box 607 with a filtering device, waste water flushed by the high-pressure water gun 604 during cutting flows to the residue collection box 607 through the water chute 606, and residues of cutting waste materials are collected and filtered, so that the purpose of protecting the environment is achieved.

In another embodiment of the double-cone connector, the internal thread 204 of the clip set includes two internal threads 204, which are disposed at two ends of the internal through hole of the clip set 103 at an interval. That is, the internal threads 204 are not through the inner surface of the clip along the axial direction thereof, and a smooth groove 201 is formed between the internal threads 204 at both ends thereof for buffering the pressing force of the internal threads 204 at both ends of the clip when being pressed in the radial direction, so as to prevent the yield strength from being exceeded, the clip from being deformed, or other unnecessary safety risks from being caused.

In another technical scheme, in the double-cone steel bar connector, two ends of the clamping piece group 103 respectively extend outwards along the axial direction to form a hollow cylindrical structure continuously arranged with the hollow frustum-shaped structure, and chamfers are arranged on the outer side wall and the inner side wall of the outer end part of the double-cone steel bar connector along the circumferential direction. Wherein, the both ends of clamping piece group 103 respectively along the axial outwards extend form with the hollow cone frustum shape structure continuous hollow cylinder structure that sets up, form the straight section of thick bamboo 202 of little segmental respectively at clamping piece group 103 both ends promptly, make installation clamping piece and clamping piece can align better when the compression is reduced. The purpose that sets up the chamfer makes above-mentioned straight section of thick bamboo structure can not influence the installation of reinforcing bar and clamping piece, and the outer tip of clamping piece is to the interference of reinforcing bar surface when inboard chamfer avoids trapezoidal thread to be extruded inside the reinforcing bar parent metal, and when the auto-lock was connected with telescopic inclined plane to the clamping piece was avoided in the outside chamfer, the outer tip of the straight section of thick bamboo of clamping piece was connected the laminating of sleeve inside wall and is caused the interference. In this embodiment, the inside chamfer is processed as a head fillet 203, and the outside chamfer is processed as a head fillet 205.

In another technical scheme, the sleeve of the double-cone steel bar connector is a conical sleeve with equal wall thickness, and the inner side wall and the outer side wall of the sleeve are smooth planes and are arranged in parallel. Specifically, the wall thickness of the sleeve wall 301 at each position is consistent, the inner surface and the outer surface of the sleeve wall are parallel to each other in any tangent plane of the sleeve, rather than only the specified tangent plane, so that the sleeve can uniformly extrude the outer side wall surface of the clamping piece on the inner side along the axial motion, the inclined surface self-locking when the sleeve is connected with the clamping piece is better realized, the sleeve is conveniently manufactured and processed, and the processing material and the processing cost are saved. In addition, the inner side and the outer side of the thin end and the thick end of the conical sleeve are provided with fillets (namely a sleeve thin end chamfer 302 and a sleeve thick end chamfer 303), so that the sleeve can be better sleeved into the clamping sheet set 103 when the clamping sheet set 103 is extruded by the sleeve, and interference is avoided.

The invention also provides a connecting method of the double-cone type steel bar connector, wherein the double-cone type steel bar connector and steel bars at two ends are connected by using an auxiliary mounting tool, and the auxiliary mounting tool comprises:

the box body is of a hollow structure, and one side of the box body is provided with a sliding groove communicated with the outside along the length direction;

a ball screw 115 which is provided inside the case in the longitudinal direction of the chute and is driven to rotate by a driving motor 116;

the two clamping heads are oppositely arranged at two ends of the sliding chute, and comprise a first clamping head 105, the fixed end of the first clamping head is fixedly connected with a nut 111 of the ball screw 115, and the clamping end extends out of the sliding chute and is in sliding connection with the sliding chute; the fixed end of the second chuck 119 is fixedly connected with the box body, the clamping end of the second chuck extends outwards and is vertical to the side wall of the box body, and the clamping end of any chuck is sleeved on the steel bar to be connected at the same end and is in sliding connection with the steel bar to be connected;

a controller 117 electrically connected to the driving motor 116.

Among the above-mentioned technical scheme, the operating position of supplementary mounting tool is parallel with the reinforcing bar of waiting to connect, and whole shape is like the electric drill. The two ends of the box body are respectively provided with a chuck, and the two chucks extend towards the same direction (perpendicular to the side wall of the box body outwards), so that the steel bar I101 to be connected and the steel bar II 104 to be connected are matched to realize clamping and positioning; the second chuck 119 is fixed to the housing, and the first chuck 105 is fixed to the nut 111 of the ball screw 115. After the preliminary positioning connection between the steel bar connector and the steel bars at two ends is completed, the next step of installation is carried out by using an auxiliary installation tool, as shown in fig. 1, the clamping end of a second clamping head 119 is sleeved into the steel bar I101 to be connected and then is arranged close to the bottom of the sleeve at the adjacent end (the same end), namely, the clamping end can be clamped at the end part of the integral steel bar connector, at the moment, a first clamping head 105 is arranged at a position 1cm longer than the whole length of the steel bar connector, and the clamping end is clamped into a steel bar II 104 to be connected, namely, the preliminary alignment installation of the auxiliary installation tool is completed; then, the driving motor is controlled to rotate through the controller, the ball screw 115 is driven to rotate, the nut 111 of the ball screw 115 drives the first chuck 105 to do linear motion downwards along the sliding groove, the first chuck 105 is enabled to abut against the top of the sleeve at the other end and then continues to move downwards, and therefore the two sleeves and the middle clamping piece are relatively pressed, and extrusion is achieved.

Specifically, the clamping end of any clamping head is in a non-closed shape, the radial length of the outer side of the clamping head is larger than the length of the maximum diameter of the sleeve, the radial length of the inner side of the clamping head is located between the maximum diameter of the sleeve and the diameter of the steel bar, on one hand, the clamping head is conveniently sleeved into the steel bar from the outer side, and on the other hand, the end of the clamping piece is guaranteed to be stressed stably all the time in the whole crimping process. The controller adopts a singlechip control system, is embedded with required programming, and can realize the functions of reversing a driving motor, returning the nut 111 on the ball screw 115, detecting whether extrusion is finished and the like, thereby realizing the accurate control of the whole extrusion process; the driving motor adopts a servo motor, so that free reversing can be realized, and the repeatability of the action of extruding the steel bar connector through the first chuck 105 is ensured. The two ends of the auxiliary mounting tool are respectively provided with an auxiliary mounting handle (namely a handle I108 and a handle II 118), so that the auxiliary mounting tool is convenient to support during mounting, and one person can complete mounting operation. A starting switch 109 and a reversing switch 107 are arranged around a handle (such as a handle I108) which is convenient to operate, and are electrically connected with a controller 117, the starting switch 109 can trigger a starting instruction of the controller, so that a driving motor rotates according to a set rotating speed and working time, and drives a ball screw 115 and a first chuck 105 to move and complete extrusion; the reversing switch 107 can trigger a reversing instruction of the controller, and after the staff judges that the extrusion is in place, the staff can press the reversing switch 107 to enable the motor to rotate reversely, and drive the ball screw 115 to drive the first chuck 105 to move reversely to the initial position. In addition, a speed reducing mechanism 110 (a three-stage speed reducing gear mechanism can be selected) is also arranged in the box body in a matched manner, a gear shaft 114 of the speed reducing mechanism is connected with an output shaft of the driving motor through a coupler 113, the output shaft of the speed reducing mechanism 110 is connected with a ball screw 115, so that the ball screw 115 and the output shaft of the driving motor are in indirect transmission, the speed reducing mechanism is small in size and high in transmission efficiency, the speed reducing and torque increasing functions can be realized through the speed reducing mechanism, the ball screw obtains larger axial thrust, and the complete operation of extrusion action is ensured. The auxiliary installation tool adopts alternating current energy supply, provides power sources for each internal electric element (a driving motor, a controller and the like), does not need to be provided with a hydraulic station and the like, is pollution-free, and has low maintenance cost. In practical application, after the initial alignment installation of the auxiliary installation tool is completed, the starting switch 109 is pressed, the output end of the servo motor drives the gear shaft 114 to rotate through the coupler 113, the reduction and the increase of torque are realized through the gear reduction mechanism, the ball screw 115 is driven to rotate, then the rotary motion is converted into the linear motion of the nut 111 through the ball screw 115 pair, and the extrusion action is further realized; after extrusion is finished, the reversing switch 107 is pressed, the roller screw rotates reversely, and the nut 111 drives the first chuck 105 to return to the original position.

In another embodiment, in the method for connecting a double-cone connector for reinforcing bars, the auxiliary installation tool further includes a limit switch 106 disposed between the first collet 105 and the box body and located on a side opposite to a moving direction of the first collet 105, the limit switch 106 is configured to record an initial position of the first collet 105; a linear displacement sensor 112 disposed between the first chuck 105 and the housing and located on the same side as the first chuck 105 in the moving direction, the linear displacement sensor 112 being configured to measure a linear displacement of the first chuck 105;

the limit switch 106 and the linear displacement sensor 112 are electrically connected to the controller 117.

Specifically, the auxiliary installation tool is further provided with a limit switch 106 and a linear displacement sensor 112. The limit switch 106 is a travel switch, belongs to one of position switches, and is a common low-current master control electrical appliance. The first chuck 105 and the box body are respectively provided with a contact switch, and when the first chuck 105 is at an initial position (measurement is not started), the two contact switches are in contact with each other and record the position as a zero point; after the operation is started, the first chuck 105 is driven by the ball screw 115 to move, the two contact switches are disconnected, the first chuck 105 is controlled to automatically reset after the controller judges that the connection of the steel bars is completed, and at the moment, the limit switch 106 is used for limiting the stroke of the first chuck 105 during resetting, so that the first chuck 105 can automatically return to a zero position to wait for the next start to perform auxiliary installation. In practical application, when the first chuck 105 is arranged at a position 1cm longer than the whole length of the steel bar connector, the limit switch 106 returns to zero, and during extrusion, the linear displacement sensor 112 sends a signal back to the control system, so that the extrusion distance is accurately controlled through the controller, and accurate extrusion is realized; when the extrusion is judged to be finished and the reversing switch 107 is pressed, the motor reverses and rotates and drives the first chuck 105 to move reversely, and when the first chuck 105 moves to the zero position recorded by the limit switch 106, the controller controls the motor to stop rotating, so that the first chuck 105 is automatically and accurately reset.

In order to further illustrate that the double-cone type steel bar connector of the invention can efficiently and accurately connect steel bars under different working conditions, the following provides application examples of the double-cone type steel bar connector under two different working conditions.

The working condition I is as follows: the two steel bars to be connected have axial deviation and no radial deviation

And assembling the double-cone type steel bar connector and a matched auxiliary mounting tool according to the design.

By utilizing the steel bar connector and the matched auxiliary mounting tool, the concrete operation steps under the first working condition are as follows:

s1, sleeving one end with a thin inner diameter in two sleeves of a steel bar connector into two steel bars to be connected respectively;

s2, enabling the middle part of a clamping piece group 103 of the steel bar connector to be positioned between the end heads of two steel bars, and aligning two ends of the clamping piece; s3, sleeving the sleeves 102 at the two ends into the two ends of the clamping sheet set 103 oppositely;

s4, attaching a second chuck 119 on a matched auxiliary mounting tool to the lower end face of the sleeve positioned below, and after the auxiliary mounting tool is electrified, opening a starting switch 109 to enable the two sleeves to be pressed into the chuck group 103 along the axial direction;

and S5, when the steel bar is extruded in place, the limit switch 106 and the linear displacement sensor 112 negatively feed back signals to the controller, the alarm lamp flickers, then the reversing switch 107 is pressed, the first chuck 105 withdraws from the working position and automatically returns, and the connection of the steel bar is completed.

Working conditions are as follows: axial deviation and radial deviation exist simultaneously in two steel bars to be connected

It should be noted that the working condition better conforms to the actual working condition, the axial deviation is the deviation along the axial direction of the steel bars to be connected, and more specifically, a gap is formed between two steel bars to be connected; the radial deviation refers to the deviation along the diameter direction of the steel bars to be connected, and in popular terms, when two steel bars to be connected are vertically arranged up and down, the two steel bars to be connected are not on the same longitudinal straight line.

By utilizing the steel bar connector and the matched auxiliary mounting tool, the concrete operation steps under the working condition II are as follows:

s1, respectively sleeving one end with a small inner diameter of two sleeves of a steel bar connector into two steel bars to be connected;

s2, with the aid of a slidable frame rod, the upper part of the frame rod hooks the steel bars to be connected above, the lower part of the frame rod presses the steel bars to be connected below, and the handle is pulled forcefully to shorten the radial deviation of the two steel bars to be connected;

s3, enabling the middle part of the clamping piece group 103 of the steel bar connector to be positioned between the end heads of the two steel bars, and aligning the two ends of the clamping piece;

s4, sleeving the sleeves 102 at the two ends into the two ends of the clamping sheet set 103 oppositely;

s5, attaching a second chuck 119 on a matched auxiliary mounting tool to the lower end face of the sleeve positioned below, and after the auxiliary mounting tool is electrified, opening a starting switch 109 to enable the two sleeves to be pressed into the chuck group 103 along the axial direction;

s6, when the steel bar is extruded in place, the limit switch 106 and the linear displacement sensor 112 negatively feed back signals to the controller, the alarm lamp flickers, then the reversing switch 107 is pressed, the first chuck 105 withdraws from the working position and automatically returns, and the connection of the steel bar is completed.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (9)

1. A double-tapered rebar connector, comprising:

the clamping piece group is of a fusiform structure formed by a plurality of clamping pieces which are continuously arranged along the circumferential direction, and the interior of the fusiform structure is axially communicated and is provided with internal threads along the length direction;

the two sleeves are symmetrically arranged at two ends of the clamping piece group, any one sleeve is of a hollow frustum-shaped structure and is coaxially sleeved at the end part of the clamping piece group, and the sleeves are attached to the connecting surface of the clamping piece group.

2. The double-tapered steel bar connector of claim 1, wherein the number of the clamping pieces in the clamping piece group is odd, and the shape of the connecting surface of any two adjacent clamping pieces conforms to a tangent function curve.

3. A double-tapered rebar connector as defined in claim 2 wherein the plurality of clips are cut by a laser cutting device, the laser cutting device including a rotary table for positioning and driving the pre-cut clip sets in rotation about an axis; the two transverse sliding rails are arranged above and below the clamping piece group at intervals in parallel and fixed on the ground through a three-dimensional frame, and the two transverse sliding rails and the axis of the clamping piece group are positioned in the same vertical plane; the longitudinal sliding rail is vertically arranged between the two transverse sliding rails and is connected with the two transverse sliding rails in a sliding manner; the laser head is arranged on the longitudinal sliding rail and is in sliding connection with the longitudinal sliding rail, and the laser head is right opposite to the surface of the outer side wall of the clamping piece group.

4. The double-cone steel bar connector according to claim 3, wherein the laser cutting device further comprises a high-pressure water gun which is fixed right above the clamping piece group through the three-dimensional frame, and a spray head of the high-pressure water gun extends downwards into an inner through hole of the clamping piece group; the inner end part of the water chute is positioned right below the clamping piece group and is communicated with the inner through hole of the clamping piece group through the through hole on the rotary workbench; and the residue collection box is communicated with the outer end part of the water chute.

5. The double-tapered rebar connector of claim 1, wherein the internal threads of the clip set comprise two internal threads spaced apart at opposite ends of an internal throughbore of the clip set.

6. The double-cone reinforcing bar connector of claim 1, wherein both ends of the clip set extend outward in the axial direction to form a hollow cylindrical structure continuously arranged with the hollow frustum-shaped structure, and chamfers are provided on the outer side wall and the inner side wall of the outer end portion in the circumferential direction.

7. A double-tapered steel bar coupler according to claim 1, wherein said sleeve is a tapered sleeve of equal wall thickness, and the inner and outer side walls thereof are smooth flat surfaces and are arranged parallel to each other.

8. A method of connecting double-tapered reinforcing bar connectors according to any one of claims 1 to 7, wherein the double-tapered reinforcing bar connectors and the reinforcing bars at both ends are connected using an auxiliary installation tool, the auxiliary installation tool comprising:

the box body is of a hollow structure, and one side of the box body is provided with a sliding groove communicated with the outside along the length direction;

the ball screw is arranged in the box body along the length direction of the sliding chute and is driven to rotate by a driving motor;

the two chucks are oppositely arranged at two ends of the sliding chute, each chuck comprises a first chuck, the fixed end of each first chuck is fixedly connected with the nut of the ball screw, and the clamping end of each first chuck extends out of the sliding chute and is in sliding connection with the sliding chute; the fixed end of the second chuck is fixedly connected with the box body, the clamping end of the second chuck extends outwards and is vertical to the side wall of the box body, and the clamping end of any chuck is sleeved on the steel bar to be connected at the same end and is in sliding connection with the steel bar to be connected;

a controller electrically connected with the driving motor.

9. The method of connecting double-tapered reinforcing bar connectors according to claim 8, wherein the auxiliary installation tool further comprises a limit switch provided between the first collet and the housing at a side opposite to a moving direction of the first collet, the limit switch being for registering an initial position of the first collet; the linear displacement sensor is arranged between the first chuck and the box body and positioned on one side in the same direction as the first chuck, and the linear displacement sensor is used for measuring the linear displacement of the first chuck;

the limit switch and the linear displacement sensor are electrically connected with the controller.

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