WO2019183993A1 - 一种扎丝切断机构及钢筋捆扎机 - Google Patents

一种扎丝切断机构及钢筋捆扎机 Download PDF

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Publication number
WO2019183993A1
WO2019183993A1 PCT/CN2018/081727 CN2018081727W WO2019183993A1 WO 2019183993 A1 WO2019183993 A1 WO 2019183993A1 CN 2018081727 W CN2018081727 W CN 2018081727W WO 2019183993 A1 WO2019183993 A1 WO 2019183993A1
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WO
WIPO (PCT)
Prior art keywords
cutter
wire
chute
buffer
slider
Prior art date
Application number
PCT/CN2018/081727
Other languages
English (en)
French (fr)
Inventor
罗泳杨
吴加元
李移清
易映国
肖秀南
Original Assignee
广东顺德华焱电子科技有限公司
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Publication date
Application filed by 广东顺德华焱电子科技有限公司 filed Critical 广东顺德华焱电子科技有限公司
Publication of WO2019183993A1 publication Critical patent/WO2019183993A1/zh

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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
    • E04G21/122—Machines for joining reinforcing bars
    • E04G21/123—Wire twisting tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
    • B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
    • B23D15/12—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D29/00—Hand-held metal-shearing or metal-cutting devices
    • B23D29/002—Hand-held metal-shearing or metal-cutting devices for cutting wire or the like

Definitions

  • the invention relates to the field of strapping machines, in particular to a wire cutting mechanism and a steel bar binding machine.
  • the steel bar binding machine is used for tying the building foundation steel bar, and has the functions of automatically feeding the wire, twisting the wire, and cutting the wire.
  • the raw material of the steel bar binding machine for tying the steel bar is a whole roll of iron wire.
  • the performance of the lever cutter 60 of the strapping machine is extremely high, as shown in Figures 1 and 2.
  • 1 is a schematic view of a wire cutting mechanism of a conventional reinforcing bar binding machine
  • FIG. 2 is a partially enlarged view of a wire cutting mechanism of the conventional reinforcing bar binding machine of FIG. 1.
  • the cutting portion 59 is integrally formed with the lever cutter 60, and the middle portion of the lever cutter 60 is hinged.
  • Fig. 3 is a schematic view showing the state in which the lever cutter of the conventional reinforcing bar binding machine is installed between the tip and the blade; and Fig. 4 is a view in the direction A in Fig. 3.
  • the blade body 61 of the reinforcing bar binding machine is fixed on the tip 76, and the wire is sent out from the wire feeding slot 62 formed by the blade body 61 and the tip 76.
  • the relative gap between the lever cutter 60 and the tip 76 is small enough to ensure that the wire is Cut off.
  • the wire cutting mechanism has the following disadvantages:
  • the wire cutting mechanism has high requirements on the dimensional accuracy and matching precision of each part, and there are many dimensional control points. Among them, there are some factors that will reduce the life of the cutting mechanism, and even the wire can not be cut, resulting in the mass production.
  • the cutting edge of the lever cutter has high requirements on the dimensional accuracy and positional accuracy of the round hole.
  • the lever cutter is difficult to finish, and the dimensional accuracy and positional accuracy of the cutting edge of the lever cutter are not high, and the end face of the cutter body can not be uniformly ground.
  • the lever cutter needs to move smoothly between the gun head and the cutter body, and the flatness of the lever cutter is required to be high.
  • the shape of the lever cutter is complicated and irregular, and the lever cutter is prone to deformation and bending, and it is difficult to perform leveling by subsequent processes.
  • the cutting edge of the cutter is actually curved.
  • the contour of the end surface of the cutter body is also specially processed into a curved shape. Therefore, the contour of the end face of the cutter body needs to be controlled. Consistency with the cutting edge of the cutter and accuracy of the relative position.
  • the object of the present invention is to provide a wire cutting mechanism and a steel bar binding machine, which eliminates the influence of the wire diameter cutting mechanism on the dimensional tolerance of the parts and the relative positional change between the parts, only The cutting of the slider cutter and the cutter chute can ensure the cutting, which reduces the difficulty of production and assembly.
  • a wire cutting mechanism comprising a cutter body having a wire feed slot, a cutter chute opening on a wire feed slot of the cutter body, and being disposed in the cutter chute a slider cutter slidable along the cutter chute and a transmission portion movable relative to the cutter cutter, the slider cutter having a first position for cutting the wire in the cutter chute and resetting the slider cutter In the second position, the transmission portion is configured to apply a driving force to the slider cutter, and the slider cutter moves between the first position and the second position after receiving the driving force.
  • the slider cutter is provided with a mating groove that cooperates with the transmission portion, and the cooperation of the transmission portion and the docking groove is a clearance fit.
  • an anti-dropping protrusion protrudes from one edge of the cutter chute
  • the transmission portion is mounted on the other side of the cutter chute
  • the slider cutter portion protrudes from the cutter chute
  • the slider cutter The upper opening is provided with a mating groove matched with the transmission portion, and the docking groove is opened along the width of the cutter chute and located on the slider cutter protruding from the cutter chute.
  • the upper and lower end faces of the transmission portion are arc-shaped convex surfaces, and the transmission portion is inserted into the docking groove through the curved convex surface; or the transmission portion is spherical, the spherical shape The transmission is connected to the docking slot.
  • the slider cutter is provided with a docking groove for engaging with the transmission portion, and the movement of the opposite slider cutter includes movement of the transmission portion in the docking groove or movement in the docking groove and movement away from the docking groove.
  • the cutter chute is vertically or obliquely disposed with respect to the wire feed slot and the cutter chute extends through the wire feed slot.
  • the cooperation of the slider cutter and the cutter chute is a clearance fit.
  • the cutter chute is a straight groove.
  • a reinforcing bar binding machine comprising the above-mentioned wire cutting mechanism.
  • the reinforcing bar binding machine comprises a middle hinged lever and a driving mechanism for swinging one end of the driving lever, and the other end of the lever is the transmission portion, and the transmission portion is connected with the slider cutter.
  • the reinforcing bar binding machine further comprises a casing and a twisting wire mechanism, the twisting wire mechanism comprising a rotating rod, a chuck, a retaining mechanism, a sleeve and a spring, the rotating rod having a threaded section, the chuck comprising a clamp a head body and a twisted wire pawl, the chuck body has a spring brace at one end, the other end is hinged with the twisted wire pawl, the spring is mounted in the spring bunker, and the front end of the rotating bar extends into the spring bunker of the collet body and passes the prevention
  • the off mechanism is connected to the spring in the spring chamber;
  • the outer surface of the sleeve has a transmission toothed belt, the transmission toothed belt includes a long tooth and a plurality of short teeth, and the inner surface of the sleeve has a screw thread coupled with the threaded section on the rotating rod.
  • the rotating rod and the chuck body are respectively connected in the sleeve, and the twisting claw is also hinged on the sleeve;
  • a lower pawl type width limit piece and an upper pawl type narrow limit piece are disposed at a position corresponding to the transmission toothed belt of the outer casing;
  • the upper pawl type narrow limit piece restricts the long teeth from rotating from bottom to top, and the long teeth are slid outward along the upper pawl type narrow limit piece after the rotating rod is pushed;
  • the lower pawl type wide limiting piece restricts the long or short tooth from rotating from top to bottom, and the long or short tooth is pulled down the lower pawl type width limit under the rotating rod.
  • the sheet slides inward;
  • the lower pawl type wide limiter restricts the long tooth from rotating from top to bottom.
  • the sleeve comprises an inner cylinder and an outer cylinder
  • the inner cylinder is fixedly sleeved in the outer cylinder
  • the inner cylinder wall surface is provided with a mosaic hole at a position corresponding to the thread segment of the rotating rod
  • the screw thread is a screw block and a screw block.
  • the drive toothed belt is disposed on the outer surface of the outer cylinder.
  • the motor comprises a motor, a twisting mechanism and a transmission system
  • the twisting mechanism comprises a rotating rod for driving the twisting mechanism to twist the wire
  • the transmission system comprises a buffering mechanism and a power input gear connected to the motor, and a power input gear a first buffering chute having an arc shape on the side
  • the buffering mechanism comprises an output wheel
  • a first transmission block driven by the first buffering chute is protruded on one side of the output wheel
  • the rotating rod is connected to the power input gear drive, and the rotating rod is also slidably connected in the central hole of the output wheel;
  • the arc of the first buffer chute is equal to or greater than the angle at which the rotating rod causes the twisting claw to be rotated from being hung to open.
  • the buffer mechanism further includes a buffer wheel, the first buffer chute driving the first transmission block through the buffer wheel, wherein the buffer wheel has a second transmission block protruding from one side and the other side has a second buffer chute having an arc, the second transmission block is connected to the first buffer chute, and the first transmission block is connected to the second buffer chute;
  • the sum of the curvatures of the first buffer chute and the second buffer chute is equal to or greater than the angle at which the rotating rod causes the twisting claw to be hung to the desired rotation;
  • the rotating rod is connected to the power input gear drive, and the rotating rod is also slidably connected in the central hole of the buffer wheel and the output wheel.
  • the buffer wheel is three, and the second transmission block of the buffer wheel of the latter stage is connected to the second buffer chute of the previous stage, the length of the first buffer chute and the three second buffer chutes.
  • the sum is equal to or greater than the length of the rotation of the twisting pawl by the pivoting pawl.
  • the utility model further comprises a wire feeding mechanism, wherein the wire feeding mechanism comprises a wire feeding transmission mechanism, wherein the wire feeding transmission mechanism comprises two wire feeding wheels, a one-way bearing and a wire feeding power input gear, the two wire feeding wheels are meshed, and the two wire feeding wheels are The tooth surface is correspondingly provided with a wire feeding slot, the wire feeding power input gear is connected with one of the wire feeding wheels through a one-way bearing, and the output wheel is connected with the wire feeding power input gear, and the wire feeding mechanism further comprises the two sending wires A clutch that separates or engages the wire wheel.
  • the wire feeding mechanism comprises a wire feeding transmission mechanism, wherein the wire feeding transmission mechanism comprises two wire feeding wheels, a one-way bearing and a wire feeding power input gear, the two wire feeding wheels are meshed, and the two wire feeding wheels are The tooth surface is correspondingly provided with a wire feeding slot, the wire feeding power input gear is connected with one of the wire feeding wheels through a one-way bearing, and the output wheel is connected with the wire feeding power input gear
  • the wire feeding mechanism further comprises a wire feeding frame
  • the clutch device comprises a clutch driving frame, a driving frame return spring, a connecting shaft and a fixing block
  • the clutch driving frame comprises an upper driving piece, a lower driving piece and a connecting upper driving piece
  • a connecting piece of the lower driving piece the upper driving piece and the lower driving piece are correspondingly provided with a connecting groove
  • the connecting shaft passes through the two connecting grooves
  • the two ends of the connecting shaft respectively protrude from the upper driving piece and the lower driving piece
  • one direction The wire feeding wheel connected to the bearing is connected in the middle of the connecting shaft, and the other wire feeding wheel is connected between the upper driving piece and the lower driving piece
  • the upper end of the connecting shaft is rotatably connected to the wire feeding frame
  • the lower end is connected to the single wire
  • the fixing block extends into the connecting groove and is connected to one end of the driving frame return spring
  • the other end of the driving frame return spring is connected to the connecting piece.
  • the present invention sets the transmission portion and the slider cutter to a relatively movable structure, so that the transmission portion and the slider cutter become two independent components, which reduces the precision of processing and assembly, and simplifies the slider cutter.
  • the assembly and the processing of the cutter chute enable the user to install it by himself, and at the same time improve the service life of the whole machine, and also improve the reliability and interchangeability of the cutting mechanism of the steel bar binding machine.
  • the lever and the slider cutter can select a more suitable material according to their working conditions, that is, the materials of the two can be made of different materials, and even if the lever hinge wears a large gap, it will not It affects the cutting of the slider cutter.
  • the slider cutter has a regular shape and is easy to process, and solves the problem that the conventional lever cutter is irregular in shape and is difficult to mass-produce.
  • the steel bar binding machine of the invention has compact structure and accurate wire feeding and twisting wire, and has good wire knotting effect and high pass rate. After the twisting wire is completed, the invention can be smoothly separated from the wire knot, and at the same time, the invention is sensitive. Moreover, it is easy to manufacture and reduce the manufacturing cost.
  • the present invention can realize continuous operation with only one motor, and therefore is light in weight and small in size, easy to operate and use, and high in efficiency.
  • the reinforcing bar binding machine of the present invention is driven by a motor, and the two motors are separately driven compared to the conventional one, which reduces the position and weight occupied by the motor, so the invention is small and light, and at the same time, the invention is sensitive And easy to manufacture, reducing manufacturing costs and easy to operate and use.
  • the present invention can further improve the efficiency and reduce the failure rate by providing the clutch device so that the newly exchanged wire can smoothly feed and feed the wire.
  • the twisting wire mechanism of the invention can realize automatic tensioning and tight twisting, straight wire removal, labor saving and quick operation.
  • the invention has a good knotting effect and a high pass rate. Thereby improving work efficiency.
  • FIG. 1 is a schematic view of a wire cutting mechanism of a conventional steel bar binding machine
  • Figure 2 is a partial enlarged view of the wire cutting mechanism of the conventional reinforcing bar binding machine of Figure 1;
  • Figure 3 is a schematic view showing the installation of a lever cutter of the prior art steel bar binding machine between the gun head and the cutter body;
  • Figure 4 is a schematic view of the direction A in Figure 3;
  • Figure 5 is a perspective view of the present invention.
  • Figure 6 is a schematic structural view of the present invention.
  • Figure 7 is a partial enlarged view of Figure 6;
  • Figure 8 is a schematic structural view of a cam of the present invention.
  • Figure 9 is a schematic view of the slider cutter of the present invention when the wire is cut
  • Figure 10 is a schematic structural view of a slider cutter of the present invention.
  • Figure 11 is a schematic view of the lever of the present invention installed between the tip and the body;
  • Figure 12 is a partial structural view of the reinforcing bar binding machine of the present invention.
  • Figure 13 is a schematic view showing the structure of Figure 12 after the C-head is removed;
  • Figure 14 is a perspective view of Figure 12;
  • Figure 15 is a partial structural view of Figure 12;
  • Figure 16 is a perspective view of Figure 15;
  • Figure 17 is a schematic view showing the twisted yarn of the twisted wire mechanism of the present invention.
  • Figure 18 is a schematic view showing the twisted yarn of the twisted wire mechanism of the present invention.
  • Figure 19 is a half cross-sectional view of Figure 18;
  • Figure 20 is an exploded view of the twisting wire mechanism of the present invention.
  • Figure 21 is a schematic view showing the positional relationship between the twisting mechanism of the present invention and the lower pawl type width limiting piece and the upper pawl type narrow limiting piece;
  • Figure 22 is a schematic view showing the structure of the threaded section of the present invention and the threaded joint;
  • Figure 23 is a schematic view showing the installation of the power input gear, the three buffer wheels and the output wheel of the present invention.
  • Figure 24 is a schematic view showing the structure of another angle of Figure 23;
  • Figure 25 is a schematic view showing the structure of a C-type head of the present invention.
  • Figure 26 is a schematic view showing the structure of the lower nozzle of the present invention.
  • Figure 27 and Figure 28 are schematic structural views of the two wire feed wheels of the present invention when engaged;
  • 29 and 30 are schematic views showing the structure of the two wire feed rollers of the present invention when they are separated.
  • a steel bar binding machine wire 63 cutting mechanism includes a cutter body 61 having a wire feed slot 62, and is disposed on the cutter body 61 and located at the wire feed opening of the wire feed slot 62. a cutter chute 64, a slider cutter 65 disposed in the cutter chute 64 slidable along the cutter chute 64, and a transmission portion 75 movable relative to the slider cutter 65;
  • the slider cutter 65 has a first position in the cutter chute 64 that cuts the wire 63 (corresponding to the position where the slider cutter 65 is located in FIG. 9) and a second position in which the slider cutter 65 is reset ( Corresponding to the position where the slider cutter 65 is located in FIGS. 6 and 7, the transmission portion 75 is for applying a driving force to the slider cutter 65, and the slider cutter 65 receives the driving force in the first position. Switch between the second position and the second position. In this embodiment, the transmission portion 75 can be moved up and down, the transmission portion 75 is moved downward to drive the slider cutter 65 to move to the first position, and the downward movement of the slider cutter 65 is sent from the wire feed slot 62. The wire 63 is cut.
  • the wire 63 may be a metal wire 63 such as a wire, a copper wire, an aluminum wire or a steel wire, etc.
  • the wire 63 may also be a plastic wire or the like.
  • the transmission portion 75 includes the above-described structure, but is not limited thereto, and may be a mechanism such as a pushing mechanism provided above the slider cutter 65 to slide the slider cutter 65 along the cutter chute 64. This will not be repeated here.
  • the slider cutter 65 is provided with a mating groove 72 that cooperates with the transmission portion 75.
  • the movement of the opposite slider cutter 65 includes the transmission portion 75 moving in the docking groove 72 or moving in the docking groove 72. And can be detached from the movement of the docking groove 72.
  • the transmission portion 75 moves down and up, the transmission portion 75 can slide in the docking groove 72, so that the sliding of the transmission portion 75 relative to the docking groove 72 can be smoothed, and the slider cutter 65 can be moved more smoothly, thereby avoiding
  • the transmission portion 75 interferes with the linear movement of the slider cutter 65 during the movement of the arc to cause a stuck or stuck phenomenon.
  • the transmission portion 75 of the above embodiment can be detached from the mating groove 72, that is, the slider cutter 65 and the transmission portion 75 are detachably connected, and therefore, the slider cutter 65 can be easily replaced after being worn or damaged.
  • connection relationship between the slider cutter 65 and the transmission portion 75 can be selected as follows.
  • a docking groove 72 that cooperates with the transmission portion 75 is formed on the slider cutter 65.
  • the engagement of the transmission portion 75 with the docking groove 72 is a clearance fit.
  • the transmission portion 75 extends into the docking groove 72, and there may be an assembly gap between the transmission portion 75 and the docking groove 72.
  • the size of the assembly gap is low, and only the downward movement and the upward stroke of the transmission portion 75 are sufficient to drive the sliding.
  • the block cutter 65 cuts the wire 63 and resets the slider cutter 65 so as not to block the wire feed slot 62 from normally feeding the wire 63.
  • the present invention provides the transmission portion 75 and the slider cutter 65 in a detachable configuration, so that the transmission portion 75 and the slider cutter 65 become two separate members, and therefore, only the processing and assembly of the present invention are required.
  • the present invention can be used to simplify the machining, and the cutter chute 64 can be set as a straight groove. Therefore, the slider cutter 65 is linearly moved in the cutter chute 64 to solve the problem.
  • the cutting edge of the cutting edge is curved, and the end face contour of the cutter body 61 needs to be specifically set to an arc shape.
  • the transmission portion 75 and the slider cutter 65 are formed as two separate components so that the lever 66 of the transmission portion 75 can be made of a material having a relatively good toughness and low cost, and here, due to the present invention, the hinge and the fulcrum of the lever cutter 60 The change in the fit clearance does not have a large effect, and therefore, the lever 66 can also be made of a material having a lower hardness.
  • the prior art lever cutter 60 is selected to have the same material as the cutter portion as a whole, so that the lever cutter 60 (the lever portion) also needs to use a high hardness material, and since the high hardness material has a brittle characteristic, The lever cutter 60 is easy to break and has high processing cost.
  • the shape of the cutter chute 64 of the slider cutter 65 of the present invention is regular. Therefore, it is convenient to achieve various dimensional accuracy requirements by sanding, and at the same time, the slider cutter 65 is placed in the cutter chute 64 to complete the assembly.
  • the utility model greatly reduces the processing difficulty and reduces the processing cost and the assembly difficulty, so that the user can perform the replacement of the slider cutter 65.
  • Figure 11 is a schematic illustration of the lever of the present invention mounted between the tip and the body.
  • the gap between the slider cutter 65 and the lance 76 of the present invention is ensured by the depth cooperation of the slider cutter 65 and the cutter chute 64. Therefore, there is no restriction on the spacing 77 between the cutter body 61 and the lance 76.
  • the lever can smoothly swing in the blade body 61 and the tip 76 even if there is deformation.
  • a retaining projection 73 is protruded from one edge of the cutter chute 64, and the transmission portion 75 is mounted on the other side of the cutter chute 64.
  • the slider cutter 65 is partially protruded from the cutter chute 64.
  • the slider cutter 65 is provided with a mating groove 72 that cooperates with the transmission portion 75.
  • the mating groove 72 is opened in the width direction of the cutter chute 64.
  • the anti-bumping block 73 is disposed on the right edge of the cutter chute 64, and the transmission portion 75 is mounted on the left side of the slot of the cutter chute 64.
  • the anti-drop groove can realize the positioning of the axial direction (corresponding to the lateral direction of FIG. 6 ), and the transmission portion 75 is connected with the docking groove 72 to realize the transmission and also cooperate with the cutter chute 64 to prevent the slider cutter 65 from being radially disengaged. (corresponds to the longitudinal direction of Fig. 6).
  • the transmission portion 75 is spherical, and the transmission portion 75 is connected to the docking groove 72, so that the sliding smoothness of the transmission portion 75 relative to the docking groove 72 can be further improved.
  • the slider cutter 65 moves more smoothly, and the jamming or jamming phenomenon occurs when the transmission portion 75 interferes with the linear movement of the slider cutter 65 during the arc movement.
  • the gap between the transmission portion 75 and the docking groove 72 in the above embodiment can also be used to solve the problem that the transmission portion 75 interferes with the linear movement of the slider cutter 65 during the arc movement and is stuck or stuck.
  • the problem can also adopt the following scheme: as shown in FIG. 6, FIG. 7, and FIG.
  • the upper and lower end faces of the transmission portion 75 are curved convex surfaces.
  • the transmission portion 75 is connected to the abutment groove 72 through the arcuate convex surface 74.
  • the cutter chute 64 is disposed perpendicularly or obliquely with respect to the wire feed slot 62 and the cutter chute 64 extends through the wire feed slot 62. As shown in FIG. 6, FIG. 7, and FIG. 9, the cutter chute 64 is vertically disposed with respect to the wire feed slot 62 and the cutter chute 64 is inserted through the wire feed slot 62. In this embodiment, the cutter chute 64 is used. Through the wire feed slot 62, the lower stroke of the slider cutter 65 can completely pass through the notch of the wire feed slot 62, thereby ensuring that the wire 63 is completely cut and separated.
  • the engagement of the slider cutter 65 with the cutter chute 64 is a clearance fit.
  • the gap between the slider cutter 65 and the cutter chute 64 is 0.01-0.10 mm. More preferably, the gap between the slider cutter 65 and the cutter chute 64 is 0.03-0.05 mm.
  • the gap and the size include the gap size formed in the following two cases.
  • the other side opposite to the mating surface is The gap between the slider cutter 65 and the cutter chute 64; the second case is when the slider cutter 65 is located in the middle of the cutter chute 64 or there is no fit between the slider cutter 65 and the cutter slippery The sum of the size of the one-sided gap or the size of the gap between the two sides between the slots 64.
  • This embodiment is a reinforcing bar binding machine, comprising the wire cutting mechanism in each of the above embodiments, and the wire cutting mechanism is installed in the reinforcing bar binding machine to cut the wire.
  • the reinforcing bar binding machine of this embodiment includes a centrally hinged lever and a driving mechanism for swinging one end of the driving lever.
  • the other end of the lever is the transmission portion 75, and the transmission portion 75 is coupled to the slider cutter.
  • the transmission portion 75 will be described below with reference to FIGS. 6 and 9.
  • a cam 67 and a spring 68 are also included.
  • the middle portion of the lever is hinged, one end of the lever is the transmission portion 75, and the other end is triggered.
  • one end of the spring 68 abuts on the upper portion of the trigger end 69, the other end of the spring 68 is fixed, and the lower portion of the trigger end 69 is in contact with the outer contour of the cam 67.
  • the convex end 70 of the cam 67 is at the highest position.
  • a vertical drop 71 is formed with the base circle of the cam 67. As shown in FIG.
  • the reinforcing bar binding machine of the embodiment comprises a casing 1, a motor 2, a wire feeding mechanism 3, a transmission system 5 and a twisting wire mechanism 6, and the twisting wire mechanism 6 includes a rotating rod 7 for driving the twisting wire mechanism 6 to tighten the wire.
  • the spring case 15 is hinged at the other end to the twisted wire claw 14, and the return spring 11 is mounted in the spring case 15.
  • the front end of the rotating rod 7 extends into the spring case 15 of the chuck body 13 and is connected by the retaining mechanism 9. Connected to the return spring 11 in the spring housing 15;
  • the outer surface of the sleeve 10 has a transmission toothed belt, and the transmission toothed belt includes a long tooth 16 and seven short teeth 17, and the inner surface of the sleeve 10 has a mating connection with the threaded section 12 on the rotating rod 7.
  • a threaded rod 18, the rotating rod 7 and the chuck body 13 are respectively connected in the sleeve 10, and the twisting claw 14 is also hinged at the end opening of the sleeve 10;
  • the outer casing 1 is provided with a lower pawl type width limiting piece 19 and an upper pawl type narrow limiting piece 20 at a position corresponding to the transmission toothed belt;
  • the upper pawl-type narrow limiting piece 20 restricts the long teeth 16 from rotating from bottom to top, and pushes the long teeth 16 along the upper pawl-type narrow limit in the threaded section 12 of the rotating rod 7.
  • the position piece 20 slides outward;
  • the lower pawl type width limiting piece 19 restricts the long tooth 16 or the short tooth 17 from rotating from top to bottom, and the long tooth 16 is pulled down in the threaded section 12 of the rotating rod 7. Or the short teeth 17 slide inward along the lower pawl type width limiting piece 19;
  • the lower pawl type wide limiting piece 19 restricts the long tooth 16 from rotating from top to bottom.
  • the sleeve 10 includes an inner cylinder 21 and an outer cylinder 22, and the inner cylinder 21 is fixedly fitted in the outer cylinder 22 and the inner cylinder 21 and the outer cylinder are connected by a radial connecting bolt.
  • the 22 phases are fixed together, and the wall of the inner cylinder 21 is provided with a mosaic hole 23 at a position corresponding to the threaded section 12 of the rotating rod 7.
  • the thread 18 is a threaded block, and the threaded block is embedded in the inserting hole 23, and is driven.
  • the toothed belt is disposed on the outer surface of the outer cylinder 22.
  • the anti-seismic mechanism 9 includes an anti-de-emulsion block 27, and a retaining hole 28 is formed on the collet body 13, and a anti-dropping ring 29 is protruded at the end of the rotating rod 7, and the anti-de-emulsion block 27 is embedded in the The detachment prevention hole 28 is then caught at the rear of the gusset prevention ring 29 to prevent the rotation lever 7 from coming loose from the spring case 15.
  • the mechanism 30 and the power input gear 31 have a first buffer chute 32 having an arc shape on one side of the power input gear 31.
  • the buffer mechanism 30 includes an output wheel 33. The one side of the output wheel 33 corresponds to the first buffer chute 32.
  • the first transmission block 34 is driven by the first buffering chute. Specifically, the first transmission block 34 is slidably coupled to the first buffering chute 32 and rotated by the first buffering chute 32. Driving the first transmission block 34;
  • the arc of the first buffer chute 32 is equal to or greater than the angle at which the rotating rod 7 rotates the twisting claw 14 from being hung to open.
  • the rotary lever 7 is drivingly coupled to the power input gear 31, and the rotary lever 7 is also coupled to the center hole of the output wheel 33 via a bearing 35.
  • the wire feeding transmission mechanism comprises two wire feeding wheels 40, a one-way bearing 44 and a wire feeding power input gear 36.
  • the two wire feeding wheels 40 are meshed, and the tooth surfaces of the two wire feeding wheels 40 are correspondingly provided with a wire feeding slot 41, and are sent
  • the wire power input gear 36 is connected to one of the wire feed wheels 40 via a one-way bearing 44, the wire feed power input gear 36 is a bevel gear, the motor 2 is connected to the power input gear 31, and the output wheel 33 is connected to the bevel gear
  • the wire feed mechanism 3 further includes a clutch device that separates or engages the two wire feed rollers 40.
  • the wire feeding mechanism 3 further includes a wire feeding frame
  • the clutching device includes a clutch driving frame 50, a driving frame return spring 51, a connecting shaft 52 and a fixing block 53.
  • the clutch driving frame 50 includes an upper driving piece 54 and a lower portion.
  • the driving piece 55 and the connecting piece 56 connecting the upper driving piece 54 and the lower driving piece 55, the upper driving piece 54 and the lower driving piece 55 are correspondingly provided with a connecting groove 57, and the connecting shaft 52 passes through the two connecting grooves 57 to connect the shaft The two ends of the 52 are respectively extended from the upper driving piece 54 and the lower driving piece 55.
  • the middle portion of the connecting shaft 52 is connected between the upper driving piece 54 and the lower driving piece 55, and the wire feeding wheel 40 connected to the one-way bearing 44 is connected at the connection.
  • the other wire feed wheel 40 is connected between the upper driving piece 54 and the lower driving piece 55.
  • the upper end of the connecting shaft 52 is rotatably connected to the wire feeding frame, and the lower end is connected to the one-way bearing 44.
  • the fixing block 53 extends into the connecting groove 57 and is connected to one end of the driving frame return spring 51. The other end of the driving frame return spring 51 is connected to the connecting piece 56.
  • the fixing block 53 is fixed on the wire feeding frame.
  • a drive block 58 is disposed on the outer casing 1, and the drive block 58 is connected to the connecting piece 56.
  • the driving block 58 When the new wire is loaded to start the wire feeding, the driving block 58 is pressed, and the driving block 58 drives the wire feeding wheel 40 connected between the upper driving piece 54 and the lower driving piece 55 to be connected to the connecting shaft 52.
  • the upper wire feeding wheel 40 is separated, and the driving frame return spring 51 is contracted, and a large wire feeding gap is formed between the two wire feeding wheels 40, so that the newly installed wire can pass smoothly, when the wire passes through the wire feeding gap
  • the pressing of the driving block 58 can be stopped.
  • the clutch driving frame 50 is reset, and the two wire feeding wheels 40 are engaged to position the wire in the wire feeding slot 14 for wire feeding.
  • the wire feeding mechanism 3 further includes a lower collecting nozzle 46 and a C-shaped head 47.
  • the lower collecting nozzle 46 is hinged to the lower portion of the C-shaped head 47.
  • the C-shaped head 47 has a wire in the twisting direction to prevent the wire from being generated during the twisting process.
  • the lower upper door 48 has a lower door 49 that is diagonally opposed to the upper door 48 to prevent deflection of the wire during twisting. It should be noted that the specific positions of the upper door 48 and the lower door 49 are determined according to the steering when the twisting mechanism 6 is tightened.
  • the twisting mechanism 6 when the twisting mechanism 6 is set to rotate clockwise to tighten the wire, The shutter 48 is disposed at the upper left and the lower door 49 is disposed at the lower right; when the twisting mechanism 6 is set to rotate the counterclockwise to tighten the wire, the upper door 48 is disposed at the upper right and the lower door 49 Then set it to the lower left.
  • the middle portion of the lever is hinged to the wire feeding mechanism, preferably, the middle portion of the lever is hinged to the C-shaped head 47 of the wire feeding mechanism.
  • the transmission system 5 of the present embodiment includes a buffer mechanism 30 and a power input gear 31.
  • the power input gear 31 has an arcuate first buffer chute 32 on one side thereof, and the buffer mechanism 30 includes an output wheel 33 and a buffer wheel 37.
  • the first buffering chute drives the first transmission block through the buffer wheel.
  • the first transmission block 34 protrudes from one side of the output wheel 33, and the buffer wheel 37 protrudes from the side with a second side.
  • a transmission block 38 having a second buffer chute 39 having an arc shape on the other side, the second transmission block 38 being connected to the first buffer chute 32, and the first transmission block 34 being connected to the second buffer chute 39;
  • the sum of the arcs of the first buffer chute 32 and the second buffer chute 39 is equal to or greater than the angle at which the rotating rod 7 rotates the twisting claw 14 from the hug to the opening;
  • the rotary lever 7 is drivingly coupled to the power input gear 31, and the rotary lever 7 is also coupled to the center hole of the buffer wheel 37 and the output wheel 33 via a bearing 35.
  • the buffering wheel 37 is three, and the three buffering wheels are stacked one on another, wherein the second transmission block of the buffering wheel of the latter stage is connected to the previous stage.
  • the sum of the arcs of the first buffer chute and the three second buffer chutes is equal to or greater than the angle at which the rotating rod 7 causes the twisting claws 14 to be rotated from being hung to open.
  • the power input gear rotates.
  • the second transmission block is at the end of the first buffer chute, and the second transmission of the buffer wheel of the latter stage.
  • the block is at the end of the second buffer chute of the previous stage, and the first transmission block is at the end of the second buffer chute, so that the power of the power input gear is directly transmitted to the output wheel, and the output wheel drives the wire feeding mechanism Spinning;
  • the twisting claw of the twisting mechanism is in an open state, so the lower pawl type wide limiting piece restricts the long tooth from rotating from top to bottom, and the twisting mechanism does not rotate and slide, specifically, although the rotating rod It is also connected to the power input gear and rotates therewith, but its steering is opposite to the thread steering, that is, the entrance end of the thread segment slips between the thread and the thread segment does not match the thread, so the twisting mechanism does not rotate and Axial sliding.
  • Twisting process When the wire reaches the set length, the motor stops rotating forward and starts to reverse the twisting action. When the motor reverses, the power input gear rotates in the opposite direction. At this time, the buffer wheel is in the buffer state, that is, the first buffer.
  • the second transmission block of the first stage buffer wheel slides back to the beginning of the first buffer chute, and the second transmission block of the first stage buffer wheel is firstly buffered
  • the first stage buffer wheel is driven to rotate, and the second transmission block of the second stage buffer wheel slides in the second buffer chute of the first stage buffer wheel, the second stage of buffering
  • the buffer wheel of the second stage is driven, and the second transmission block of the buffer wheel of the third stage is in the buffer wheel of the second stage
  • the buffer wheel of the third stage is driven, the first transmission block Sliding in the second buffer chute of the third stage buffer wheel, the first pass
  • the rotating rod is reversely driven, that is,
  • the twisted claws hold the wire, and when the twisted claws hold the wire, the long teeth are separated from the upper ratchet type narrow limit piece, and the twisted wire mechanism is rotated to perform the twisting, because the number of twisted wires is based on actual conditions. However, the number of twists is not determined. Therefore, a one-way bearing is provided on the wire feeding mechanism of the wire feeding mechanism, so even if the buffering state of the buffer wheel is over at this time, the power is transmitted from the output wheel to the wire feeding.
  • the cam rotates, and when the convex end of the cam contacts the trigger end, the trigger end is gradually lifted, the spring contracts, and the transmission portion at the other end of the lever moves downward, and the slider is cut.
  • the knife cuts the wire.
  • the wire When the wire is cut for twisting, the wire is often deflected by the torsion force at the intersection of the two bars. The skewed wire will be loosened after being tightened. To avoid this loose phenomenon, tighten it.
  • the upper door and the lower door are disposed in the direction. Specifically, when the clockwise is tightened, the upper door and the lower door respectively block the upwardly and downwardly rotating wires from being deflected. Ensure that the twisting mechanism can be tightened smoothly without loosening. After tightening, the lower collecting nozzle can be rotated downward along the hinge. Therefore, when the reinforcing bar binding machine is separated from the wire, the lower collecting nozzle is avoided and the reinforcing bar is tied. The machine is smoothly separated from the wire to avoid the phenomenon that the wire is stuck and cannot be separated.
  • Reset process When the twisted wire is completed, the motor will immediately rotate from the reverse direction to the positive direction. At this time, the twisted claws are hung to open, and the lower pawl type wide limiter restricts the long or short teeth from top to bottom. Rotating, while pulling the long or short teeth on the threaded section of the rotating rod, sliding inward along the lower pawl-type wide limiting piece; specifically, the motor rotates in the positive direction, and the threaded section of the rotating rod is rotated out from the screw.
  • the twisted claws are opened, and since the lower pawl-type wide limit piece restricts the long or short teeth from rotating from top to bottom, the long or short teeth are pulled down the lower pawl type wide limit piece on the threaded section of the rotating rod. Sliding inwardly, at this time, if the short tooth slides inward along the lower pawl type width limiting piece, the drawing stroke of the threaded section is shorter than the long tooth by the stroke of the short tooth along the lower pawl type wide limiting piece sliding inwardly.
  • the buffer wheel is reset from the buffer state to the trigger state. This process is opposite to the buffer state operation and will not be described here. It should be noted that the sum of the arcs of the first buffering chute and the three second buffering chutes is equal to or greater than the angle at which the rotating rod rotates from the clasp to the opening, so as to ensure that the twisting claws are fully opened.
  • the wire feeding mechanism performs wire feeding to ensure that the twisting wire can be stable and continuous, and avoid damage. When the binding is completed, the next binding can be performed.
  • the return spring is always in a compressed state after being mounted to the spring chamber, and the return spring acts as follows:
  • the threaded section When the threaded section is completely unscrewed from the thread, when the inlet end of the threaded section and the thread are slipping, under the action of the return spring, the threaded section always keeps close contact with the thread, that is, the inlet end of the threaded section and the thread remain The slipping state does not occur when the inlet end of the threaded section leaves the thread, so that when the turning rod turns to the same direction as the threaded section, the threaded section cannot be connected with the thread. Therefore, the advantage of providing the return spring is that when the steering of the rotating rod is changed to be the same as the turning of the threaded section, the inlet end of the threaded section can be quickly fitted with the thread, which makes the invention more sensitive and work more efficient.

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Abstract

公开了一种扎丝（63）切断机构及钢筋捆扎机。其中，该扎丝切断机构，包括开设有送丝槽（62）的刀体（61）、开设在刀体（61）的送丝槽（62）上的切刀滑槽（64）、设置在切刀滑槽（64）中可沿切刀滑槽（64）滑动的滑块切刀（65）以及可相对滑块切刀（65）运动的传动部（75），滑块切刀（65）在切刀滑槽（64）中具有切断扎丝（63）的第一位置和使滑块切刀（65）复位的第二位置，传动部（75）用于向滑块切刀（65）施加驱动力，滑块切刀（65）接收到驱动力后在第一位置和第二位置之间移动。该扎丝切断机构将传动部和滑块切刀设置为可相对运动的结构，使传动部和滑块切刀成为两个独立的部件，降低了加工和组装的精度要求，简化了滑块切刀的装配和切刀滑槽的加工，同时提高了整机的使用寿命，还提升了钢筋捆扎机切断机构的可靠性和可互换性。

Description

一种扎丝切断机构及钢筋捆扎机 技术领域
本发明涉及捆扎机领域，尤其涉及一种扎丝切断机构及钢筋捆扎机。
背景技术
钢筋捆扎机用于建筑基础钢筋的绑扎，具备自动送铁丝，扭紧铁丝，切断铁丝等功能。钢筋捆扎机绑扎钢筋的原材料为整卷状的铁丝，捆扎机每完成一次钢筋的绑扎，都需要切断一次铁丝，这对捆扎机的杠杆切刀60性能要求极高，如图1和2所示，图1为现有钢筋捆扎机的铁丝切断机构的示意图；图2为图1的现有钢筋捆扎机的铁丝切断机构局部放大图。其中，切断部分59与杠杆切刀60一体成形，杠杆切刀60中部铰接起来，通过对杠杆切刀60一端的推动，使位于杠杆切刀60另一端的切断部分59下行与刀体61配合从而将从刀体61的送丝槽62送出的铁丝切断。图3是现有钢筋捆扎机的杠杆切刀安装在枪头和刀体之间的示意图；图4是图3中的A向的示意图。钢筋捆扎机的刀体61是固定在枪头76上，铁丝从刀体61和枪头76形成的送丝槽62送出，杠杆切刀60和枪头76相对平面间隙足够小，才能保证铁丝被切断。
因此铁丝切断机构存在以下不足：
1、铁丝切断机构对各零件的尺寸精度和配合精度要求高，尺寸控制点多，其中某个因素有差异，会降低切断机构寿命，甚至无法切断扎丝，导致产品无法量产。
2、杠杆切刀在使用时，要求杠杆切刀和枪头支点配合的圆孔加工精度要求高。钢筋捆扎机铁丝切断机构运动频繁，各个零件容易磨损，特别是杠杆切刀铰接处的配合间隙变大后导致杠杆切刀刃口和刀体端面相互配合的间隙和位置度发生变化，无法保证铁丝完全切断。
3、杠杆切刀刃口相对其圆孔的尺寸精度和位置精度要求高。杠杆切刀难以精加工，杠杆切刀刃口尺寸精度和位置精度一致性不高，导致与之配合的刀体端面无法统一修磨。
4、杠杆切刀需要在枪头和刀体之间能顺利运动，对杠杆切刀的平面度要求高。杠杆切刀形状复杂且不规则，杠杆切刀容易发生变形弯曲，难于采用后续工序进行整平。
5、不能实现批量生产。如图3所示，由于杠杆切刀60制造难度大，产品存在严重变形，导致杠杆切刀60弯曲后占的空间变大，当其占的空间大于间距77时，杠杆切刀60容易卡在刀体61和枪头76之间，导致生产组装困难，如果把间距77加大则会出现杠杆切刀60摆动，在切断时会从铁丝一侧滑过，导致铁丝不能切断的问题。
6、如图1和2所示，切刀刃口轨迹实际上是呈弧形的，相对的，刀体端面轮廓也要专门加工成与之相配合的弧形，因此，需管控刀体端面轮廓与切刀刃口轨迹的一致性和相对位置的准确性。
7、由上述2-6项可见，扎丝切断机构的功能实现效果，是上述各种零件精度和配合精度产生叠加的最终体现。在实际生产中，由于各种精度要求间会产生误差叠加，导致铁丝切断机构性能不稳定，且无法量产。
8、切断机构频繁使用容易导致各零件的磨损，包括枪头支点的磨损，杠杆切刀圆孔磨损，切刀刃口磨损，刀体送丝槽磨损。其中一个零件磨损后，就会影响切断机构性能。由于切断机构各零件属于选配组装，零件磨损后，只能更换整个切断机构，无法通过更换单一零件进行修复。
发明内容
针对现有技术中存在的技术问题，本发明的目的是：提供一种扎丝切断机构及钢筋捆扎机，消除了扎丝切断机构因零件尺寸公差累积和零件间相对位置变化的影响，仅要保证滑块切刀和切刀滑槽的配合即可实现切断，降低了生产和装配难度。
本发明的目的通过下述技术方案实现：一种扎丝切断机构，包括开设有送丝槽的刀体、开设在刀体的送丝槽上的切刀滑槽、设置在切刀滑槽中可沿切刀滑槽滑动的滑块切刀以及可相对滑块切刀运动的传动部，滑块切刀在切刀滑槽中具有切断扎丝的第一位置和使滑块切刀复位的第二位置，传动部用于向滑块切刀施加驱动力，滑块切刀接收到所述驱动力后在第一位置和第二位置之间移动。
优选的，所述滑块切刀上开设有与传动部配合的对接槽，传动部与对接槽的配合为间隙配合。
优选的，切刀滑槽一侧边缘处凸出有防脱凸块，传动部安装在切刀滑槽另一侧，滑块切刀部分凸出于切刀滑槽，所述滑块切刀上开设有与传动部配合的对接槽，对接槽沿切刀滑槽宽度方向开设且位于凸出于切刀滑槽的滑块切刀上。
优选的，沿驱动力驱动方向，所述传动部的上下两端面为弧形凸起面，传动部通过弧形凸起面装入到对接槽中；或者，传动部呈球状，所述呈球状的传动部连接到对接槽中。
优选的，所述滑块切刀上开设有与传动部配合的对接槽，所述相对滑块切 刀的运动包括传动部在对接槽中移动或在对接槽中移动且可脱离对接槽的运动。
优选的，切刀滑槽相对送丝槽垂直或倾斜设置且切刀滑槽贯穿送丝槽。
优选的，滑块切刀与切刀滑槽的配合为间隙配合。
优选的，所述切刀滑槽为直槽。
一种钢筋捆扎机，包括上述的扎丝切断机构。
优选的，所述钢筋捆扎机包括中部铰接的杠杆以及驱动杠杆一端摆动的驱动机构，杠杆的另一端为所述传动部，传动部与滑块切刀连接。
优选的，钢筋捆扎机还包括外壳以及扭丝机构，所述扭丝机构包括转动杆、夹头、防脱机构、套筒以及弹簧，所述转动杆上具有螺纹段，所述夹头包括夹头本体以及扭丝爪子，夹头本体一端具有弹簧仓，另一端与所述扭丝爪子相铰接，弹簧装在弹簧仓中，转动杆前端伸进夹头本体的弹簧仓中并通过所述防脱机构连接在弹簧仓中与弹簧相连接；
所述套筒外表面上具有传动齿带，所述传动齿带包括一个长齿和若干个短齿，所述套筒内表面上具有与转动杆上的螺纹段相配合连接的螺牙，所述转动杆和夹头本体分别连接在套筒中，扭丝爪子还铰接在套筒上；
外壳对应传动齿带的位置处设置有下棘爪式宽限位片和上棘爪式窄限位片；
当扭丝爪子抱紧过程中，上棘爪式窄限位片限制长齿由下往上转动，并且在转动杆推送下长齿沿上棘爪式窄限位片向外滑动；
当扭丝爪子由抱紧到打开过程中，下棘爪式宽限位片限制长齿或短齿由上往下转动，并且在转动杆抽拉下长齿或短齿沿下棘爪式宽限位片向内滑动；
当扭丝爪子处于打开状态时，下棘爪式宽限位片限制长齿由上往下转动。
优选的，所述套筒包括内筒和外筒，内筒固定套在外筒中，内筒壁面对应转动杆的螺纹段位置处开设有嵌镶孔，所述螺牙为螺牙块，螺牙块嵌入所述嵌镶孔中，传动齿带设置在外筒的外表面上。
优选的，包括电机、扭丝机构以及传动系统，扭丝机构包括驱动扭丝机构将铁丝扭紧的转动杆，传动系统包括缓冲机构以及与所述电机连接的动力输入齿轮，动力输入齿轮的一侧面上具有呈弧形的第一缓冲滑槽，缓冲机构包括输出轮，输出轮一侧面上凸出有由所述第一缓冲滑槽带动的第一传动块；
转动杆与动力输入齿轮传动连接，转动杆还滑动连接在输出轮的中心孔中；
所述第一缓冲滑槽的弧度等于或大于转动杆使扭丝爪子由抱紧到打开所需转动的角度。
优选的，缓冲机构还包括缓冲轮，所述第一缓冲滑槽通过所述缓冲轮带动第一传动块，其中，所述缓冲轮一侧面凸出有第二传动块，另一侧面上具有呈弧形的第二缓冲滑槽，第二传动块连接到第一缓冲滑槽中，第一传动块连接到第二缓冲滑槽中；
第一缓冲滑槽和第二缓冲滑槽的弧度之和等于或大于转动杆使扭丝爪子由 抱紧到打开所需转动的角度；
转动杆与动力输入齿轮传动连接，转动杆还滑动连接在缓冲轮和输出轮的中心孔中。
优选的，所述缓冲轮为三个，后一级的缓冲轮的第二传动块连接到前一级的第二缓冲滑槽中，第一缓冲滑槽和三个第二缓冲滑槽的长度之和等于或大于转动杆使扭丝爪子由抱紧到打开所转动的行程的长度。
优选的，还包括送丝机构，送丝机构包括送丝传动机构，送丝传动机构包括两送丝轮、单向轴承以及送丝动力输入齿轮，两送丝轮相啮合，两送丝轮的齿面对应设有送丝槽，送丝动力输入齿轮通过单向轴承与其中一个送丝轮相连接，输出轮与送丝动力输入齿轮连接，所述送丝机构还包括使所述两送丝轮分开或啮合的离合装置。
优选的，所述送丝机构还包括送丝架，离合装置包括离合驱动架、驱动架复位弹簧、连接轴以及固定块，所述离合驱动架包括上驱动片、下驱动片以及连接上驱动片和下驱动片的连接片，上驱动片和下驱动片上对应开设有连接槽，连接轴穿过所述两连接槽，连接轴两端分别伸出于上驱动片和下驱动片，与单向轴承连接的送丝轮连接在连接轴的中部，另一个送丝轮则连接在上驱动片和下驱动片之间，连接轴上端转动连接在所述送丝架上，下端连接在所述单向轴承中，所述固定块伸进连接槽中，且与驱动架复位弹簧的一端连接，驱动架复位弹簧另一端连接在连接片上。
本发明相对于现有技术具有如下的优点及效果：
1、本发明将传动部和滑块切刀设置为可相对运动的结构，使传动部和滑块切刀成为两个独立的部件，降低了加工和组装的精度要求，简化了滑块切刀的装配和切刀滑槽的加工，实现用户可自行进行安装，同时提高了整机的使用寿命，还提升了钢筋捆扎机切断机构的可靠性和可互换性。此外，杠杆和滑块切刀可以根据自身工作情况，选用更为合适的材料，即，两者的材料可选择使用不相同的材料制作，同时，即使杠杆铰接处磨损产生大的间隙也不会对滑块切刀的切断产生影响。而滑块切刀形状规则，易于加工，解决了传统的杠杆切刀形状不规则而导致难于批量生产的问题。
2、本发明的钢筋捆扎机结构紧凑且能精确送丝和扭丝，且铁丝打结效果好，合格率高，扭丝完成后本发明与铁丝结间能顺利分离，同时，本发明反应灵敏且易于生产制造，降低了制造成本，本发明只需一个电机即可实现连续作业，因此重量轻和体积小，易于操作和使用，效率高。
3、本发明的钢筋捆扎机通过一个电机进行驱动，相比于传统要两个电机分别进行驱动，减少了电机所占的位置和重量，因此本发明体积小且轻盈，同时，本发明反应灵敏且易于生产制造，降低了制造成本且易于操作和使用。
4、本发明通过设置了离合装置能使新换入的铁丝能顺利进丝和送丝从而进一步提高效率和减少故障率的发生。
5、本发明的扭丝机构能实现自动的张合且扭丝紧实、脱丝干脆、操作省力、 快捷。此外本发明打结效果好、合格率高。从而提高了工作效率。
附图说明
图1是现有钢筋捆扎机的扎丝切断机构的示意图；
图2是图1的现有钢筋捆扎机的扎丝切断机构局部放大图；
图3是现有钢筋捆扎机的杠杆切刀安装在枪头和刀体之间的示意图；
图4是图3中的A向的示意图；
图5是本发明的立体图；
图6是本发明的结构示意图；
图7是图6的局部放大图；
图8是本发明的凸轮的结构示意图；
图9是本发明的滑块切刀切断扎丝时的示意图；
图10是本发明的滑块切刀的结构示意图；
图11是本发明杠杆安装在枪头和刀体之间的示意图；
图12是本发明的钢筋捆扎机局部结构示意图；
图13是图12拆下C型头后的结构示意图；
图14是图12的立体图；
图15是图12的局部结构示意图；
图16是图15的立体图；
图17是本发明的扭丝机构的扭丝爪子张开状态示意图；
图18是本发明的扭丝机构的扭丝爪子抱紧状态示意图；
图19是图18的半剖图；
图20是本发明的扭丝机构的爆炸图；
图21是本发明的扭丝机构与下棘爪式宽限位片和上棘爪式窄限位片的位置关系结构示意图；
图22是本发明的螺纹段与螺牙相配合连接的结构示意图；
图23是本发明的动力输入齿轮、三个缓冲轮和输出轮安装示意图；
图24是图23另一角度的结构示意图；
图25是本发明的C型头的结构示意图；
图26是本发明的下收丝嘴的结构示意图；
图27和图28是本发明的两送丝轮啮合时的结构示意图；
图29和图30是本发明的两送丝轮分开时的结构示意图。
具体实施方式
下面结合实施例及附图对本发明作进一步详细的描述，但本发明的实施方式不限于此。
如图5、图6和图9所示，一种钢筋捆扎机扎丝63切断机构，包括开设有送丝槽62的刀体61、开设在刀体61上且位于送丝槽62出丝口处的切刀滑槽64、设置 在切刀滑槽64中可沿切刀滑槽64滑动的滑块切刀65以及与可相对滑块切刀65运动的传动部75；
滑块切刀65在切刀滑槽64中具有切断扎丝63的第一位置(对应于图9中滑块切刀65所处的位置)和使滑块切刀65复位的第二位置(对应于图6和图7中滑块切刀65所处的位置)，传动部75用于向滑块切刀65施加驱动力，滑块切刀65接收到所述驱动力后在第一位置和第二位置之间切换。在本实施例中，传动部75可上行和下移，传动部75下移驱动滑块切刀65移动到所述第一位置，滑块切刀65的下移将从送丝槽62送出的扎丝63切断。扎丝63被切断后，传动部75上行驱动滑块切刀65迅速上行，从而使驱动滑块切刀65上行到所述第二位置。所述扎丝63可以为金属扎丝63，如：铁丝、铜丝、铝丝和钢丝等，扎丝63也可以是塑料丝等。
需要说明的是传动部75包括上述结构，但不局限于此，还可以是设置于滑块切刀65上方的推动机构等可以使滑块切刀65沿切刀滑槽64滑动的机构，在此不再赘述。
本实施例中，所述滑块切刀65上开设有与传动部75配合的对接槽72，所述相对滑块切刀65的运动包括传动部75在对接槽72中移动或在对接槽72中移动且可脱离对接槽72的运动。具体的，传动部75在下移和上行时，传动部75可在对接槽72中滑动，可使传动部75相对对接槽72产生的滑动更畅顺，使滑块切刀65移动更顺畅，避免传动部75在弧形移动时与滑块切刀65的直线移动相干涉出现卡滞或卡停现象。
上述实施例的传动部75可从对接槽72中脱离出来，即滑块切刀65与传动部75间为可拆卸连接，因此，滑块切刀65磨损或损坏后可方便地进行更换。
如图6、图7和图9所示，滑块切刀65与传动部75的连接关系可以选择采用以下方案，在所述滑块切刀65上开设与传动部75配合的对接槽72，传动部75与对接槽72的配合为间隙配合。具体的，传动部75伸进对接槽72中，且传动部75与对接槽72之间可以存在装配间隙，装配间隙的大小要求低，只需在传动部75下移和上行的行程足够带动滑块切刀65切断扎丝63和使滑块切刀65复位后不阻挡送丝槽62正常送扎丝63即可。
由此可见，本发明将传动部75和滑块切刀65设置为可拆卸结构，使传动部75和滑块切刀65成为两个独立的部件，因此，加工和组装本发明时，仅需要关注滑块切刀65和切刀滑槽64的加工和安装精度即可，不再需要严格控制杠杆切刀60铰接处和支点的配合间隙的变化以及切刀刃口到支点转动中心的距离，此外，如图6、图7和图9所示，本发明为简化加工，可以将切刀滑槽64设置为直槽，因此，滑块切刀65在切刀滑槽64中作直线运动，解决了切刀刃口轨迹弧形而需将刀体61端面轮廓专门设置为弧形的问题。
传动部75和滑块切刀65成为两个独立的部件可使传动部75的杠杆66可选择韧性较好且廉价的材料制成，此处，由于本发明对杠杆切刀60铰接处和支点的配合间隙的变化不产生大影响，因此，杠杆66还可选用硬度较底的材料制造。 解决了现有技术的杠杆切刀60整体都要选用与切刀部分相同的材料，导致杠杆切刀60(杠体部分)也需采用高硬度材料，由于高硬度材料具有较脆的特性，因此，杠杆切刀60易断且加工成本高。本发明的滑块切刀65的切刀滑槽64的形状规则，因此，通过打磨即可方便达到各尺寸精度要求，同时，将滑块切刀65放进切刀滑槽64中即完成装配，极大降低了加工难度的同时也降低了加工成本和装配难度，实现用户即可进行滑块切刀65的更换。
图11是本发明杠杆安装在枪头和刀体之间的示意图。本发明滑块切刀65和枪头76的间隙是由滑块切刀65和切刀滑槽64的深度配合保证，因此,对刀体61和枪头76之间的间距77没有限制，可以放宽间距77的尺寸，杠杆即使存在变形也可以在刀体61和枪头76中顺畅摆动。
本实施例中为防止滑块切刀65脱离切刀滑槽64，切刀滑槽64一侧边缘处凸出有防脱凸块73，传动部75安装在切刀滑槽64另一侧，滑块切刀65部分凸出于切刀滑槽64，所述滑块切刀65上开设有与传动部75配合的对接槽72，对接槽72沿切刀滑槽64宽度方向开设在凸出于切刀滑槽64的滑块切刀65上，具体可以如下所述:
如图6、图7和图9所示，本实施例中，防脱凸块73设置于切刀滑槽64右边缘上，传动部75则安装于切刀滑槽64槽口左侧，通过防脱槽可实现轴向(对应于图6的横向)的定位，传动部75与对接槽72连接，可实现传动同时还可与切刀滑槽64共同作用防止滑块切刀65径向脱离(对应于图6的纵向)。
作为一个优选的实施例，所述传动部75呈球状，将所述传动部75连接到对接槽72中，可使传动部75相对对接槽72产生的滑动畅顺性得到更进一步的提升，使滑块切刀65移动更顺畅，避免传动部75在弧形移动时与滑块切刀65的直线移动相干涉出现卡滞或卡停现象。此外，也可使用上述实施例中采取传动部75与对接槽72间通过间隙配合同样可解决传动部75在弧形移动时与滑块切刀65的直线移动相干涉出现卡滞或卡停的问题，当然，还可以采取以下方案：如图6、图7和图9所示，沿驱动力驱动方向(对应于图7的上下方向)，传动部75的上下两端面为弧形凸起面74(即对应于图7中的传动部75的上下两端面)，传动部75通过弧形凸起面74连接到对接槽72中。
为提高扎丝63完全被切断的机率，优选的，切刀滑槽64相对送丝槽62垂直或倾斜设置且切刀滑槽64贯穿送丝槽62。如图6、图7和图9所示，为切刀滑槽64相对送丝槽62垂直设置且切刀滑槽64贯穿送丝槽62的例子，本实施例中，由于切刀滑槽64贯穿送丝槽62，因此，滑块切刀65下行程可完全经过送丝槽62的槽口，从而保证扎丝63被完全切断分离。
为更顺畅地使滑块切刀65滑动，同时也能保证扎丝63的切断，优选的，滑块切刀65与切刀滑槽64的配合为间隙配合。具体的，滑块切刀65与切刀滑槽64之间的间隙为0.01-0.10mm。更优选的，滑块切刀65与切刀滑槽64之间的间隙为0.03-0.05mm。所述间隙和大小包括以下两个情况下形成的间隙大小，第一种情况是滑块切刀65与切刀滑槽64一壁面相贴合后，与相贴合面相对的另一侧的滑 块切刀65与切刀滑槽64的间隙大小；第二种情况是滑块切刀65位于切刀滑槽64正中或两者间无贴合时，滑块切刀65与切刀滑槽64间的单侧间隙大小或相对两侧间隙大小的总和。
本实施例为一种钢筋捆扎机，包括上述各实施例中的扎丝切断机构，将扎丝切断机构安装到钢筋捆扎机中，从而对扎丝进行切断。
本实施例的钢筋捆扎机包括中部铰接的杠杆以及驱动杠杆一端摆动的驱动机构，杠杆的另一端为所述传动部75，传动部75与滑块切刀连接。
以下将结合图6和图9对传动部75进行说明，如图6和图9所示，还包括凸轮67以及弹簧68，杠杆中部铰接起来，杠杆一端为所述传动部75，另一端为触发端69，弹簧68一端抵接在触发端69上部，弹簧68另一端被固定，触发端69下部与凸轮67外轮廓相接触，如图8所示，凸轮67的凸起端70在最高位处与凸轮67基圆形成垂直落差71。如图9所示，凸轮67转动，凸轮67的凸起端70与触发端69接触时，触发端69被逐渐抬起，弹簧68收缩，而杠杆另一端的传动部75弧形下移，滑块切刀切断扎丝。当触发端69与凸轮67的凸起端70最高端接触后，由于存在垂直落差71，同时在弹簧68的顶推下，杠杆的触发端69被下压，与此同时，杠杆另一端的传动部75迅速上行。
本实施例的钢筋捆扎机，包括外壳1、电机2、送丝机构3、传动系统5以及扭丝机构6，所述扭丝机构6包括驱动扭丝机构6将铁丝扭紧的转动杆7、夹头8、防脱机构9、套筒10以及复位弹簧11，所述转动杆7上具有螺纹段12，所述夹头8包括夹头本体13以及扭丝爪子14，夹头本体13一端具有弹簧仓15，另一端与所述扭丝爪子14相铰接，复位弹簧11装在弹簧仓15中，转动杆7前端伸进夹头本体13的弹簧仓15中并通过所述防脱机构9连接在弹簧仓15中与复位弹簧11相连接；
所述套筒10外表面上具有传动齿带，所述传动齿带包括一个长齿16和7个短齿17，套筒10内表面上具有与转动杆7上的螺纹段12相配合连接的螺牙18，所述转动杆7和夹头本体13分别连接在套筒10中，扭丝爪子14还铰接在套筒10的末端口处；
外壳1对应传动齿带的位置处设置有下棘爪式宽限位片19和上棘爪式窄限位片20；
当扭丝爪子14抱紧过程中，上棘爪式窄限位片20限制长齿16由下往上转动，并且在转动杆7的螺纹段12推送下长齿16沿上棘爪式窄限位片20向外滑动；
当扭丝爪子14由抱紧到打开过程中，下棘爪式宽限位片19限制长齿16或短齿17由上往下转动，并且在转动杆7的螺纹段12抽拉下长齿16或短齿17沿下棘爪式宽限位片19向内滑动；
当扭丝爪子14处于打开状态时，下棘爪式宽限位片19限制长齿16由上往下转动。
为降低套筒10的制造难度同时降低制造成本，所述套筒10包括内筒21和外筒22，内筒21固定套在外筒22中并通过在径向连接螺栓将内筒21和外筒22相固定在一起，内筒21壁面对应转动杆7的螺纹段12位置处开设有嵌镶孔23，所述螺 牙18为螺牙块，螺牙块嵌入所述嵌镶孔23中，传动齿带设置在外筒22的外表面上。
所述防脱机构9包括防脱嵌块27，在夹头本体13上开设有防脱嵌孔28，在转动杆7末端处凸出有防脱凸环29，防脱嵌块27嵌镶在防脱嵌孔28后卡在防脱凸环29的后部处，以防止转动杆7从弹簧仓15中松脱出来。
为达到一个电机2同时驱动扭丝机构6和送丝机构3，在完成送丝后马上开始扭丝使整个工作过程连续准确进行，且相互间工作时不受影响，所述传动系统5包括缓冲机构30以及动力输入齿轮31，动力输入齿轮31的一侧面上具有呈弧形的第一缓冲滑槽32，缓冲机构30包括输出轮33，输出轮33一侧面上对应第一缓冲滑槽32的位置凸出有由第一缓冲滑槽带动的第一传动块34，具体的，可以是所述第一传动块34滑动连接在第一缓冲滑槽32中，通过第一缓冲滑槽32的转动而带动第一传动块34；
所述第一缓冲滑槽32的弧度等于或大于转动杆7使扭丝爪子14由抱紧到打开所转动的角度。
转动杆7与动力输入齿轮31传动连接，转动杆7还通过轴承35连接在输出轮33的中心孔中。
由于只采用了一个电机2即可实现扭丝机构6和送丝机构3的驱动，因此无需两个电机分别驱动，减少了体积和重量便于携带和使用，同时降低生产成本。
为有效解决现有技术中由于两送丝轮夹紧导致送丝槽过细在换进新的铁丝时，铁丝不能顺利穿过送丝槽进行送丝的问题，送丝机构3包括送丝传动机构，送丝传动机构包括两送丝轮40、单向轴承44以及送丝动力输入齿轮36，两送丝轮40相啮合，两送丝轮40的齿面对应设有送丝槽41，送丝动力输入齿轮36通过单向轴承44与其中一个送丝轮40相连接，送丝动力输入齿轮36为锥形齿轮，所述电机2与动力输入齿轮31连接，输出轮33与锥形齿轮连接，所述送丝机构3还包括使所述两送丝轮40分开或啮合的离合装置。
优选的，所述送丝机构3还包括送丝架，离合装置包括离合驱动架50、驱动架复位弹簧51、连接轴52以及固定块53，所述离合驱动架50包括上驱动片54、下驱动片55以及连接上驱动片54和下驱动片55的连接片56，上驱动片54和下驱动片55上对应开设有连接槽57，连接轴52穿过所述两连接槽57，连接轴52两端分别伸出于上驱动片54和下驱动片55，连接轴52的中部连接于上驱动片54和下驱动片55之间，与单向轴承44连接的送丝轮40连接在连接轴52的中部，另一个送丝轮40则连接在上驱动片54和下驱动片55之间，连接轴52上端转动连接在所述送丝架上，下端连接在所述单向轴承44中，所述固定块53伸进连接槽57中，且与驱动架复位弹簧51的一端连接，驱动架复位弹簧51另一端连接在连接片56上，所述固定块53固定在送丝架上，外壳1上设置有驱动按块58，驱动按块58与连接片56相连接。
当装入新的铁丝开始送丝时，按压驱动按块58，驱动按块58驱动连接于上驱动片54和下驱动片55之间的送丝轮40移动，使之与连接在连接轴52上的送丝 轮40分离开来，而驱动架复位弹簧51收缩，两送丝轮40间形成较大的送丝间隙，从而使新装进的铁丝能顺利通过，当铁丝通过送丝间隙后，即可停止对驱动按块58的按压，此时在驱动架复位弹簧51的作用下，离合驱动架50复位，两送丝轮40相啮合将铁丝定位在送丝槽14中进行送丝。
所述送丝机构3还包括下收丝嘴46以及C型头47，下收丝嘴46铰接于C型头47下部，C型头47在扭丝方向上具有防止铁丝在扭丝过程中产生偏斜的上挡门48，所述下收丝嘴46具有与上挡门48斜对的防止铁丝在扭丝过程中产生偏斜的下挡门49。需要说明的是上挡门48和下挡门49具体位置是根据扭丝机构6扭紧时的转向决定的，具体的，当设定扭丝机构6在顺时针转动为扭紧铁丝时，上挡门48则设置在左上方而下挡门49则设置在右下方；当设定扭丝机构6在逆时针转动为扭紧铁丝时，上挡门48则设置在右上方而下挡门49则设置在左下方。
当杠杆中部铰接在送丝机构上时，优选的，杠杆中部铰接在送丝机构的C型头47上。
本实施例所述传动系统5包括缓冲机构30以及动力输入齿轮31，动力输入齿轮31的一侧面上具有呈弧形的第一缓冲滑槽32，缓冲机构30包括输出轮33以及缓冲轮37，所述第一缓冲滑槽通过所述缓冲轮带动第一传动块，具体的，所述输出轮33一侧面上凸出有第一传动块34，所述缓冲轮37一侧面凸出有第二传动块38，另一侧面上具有呈弧形的第二缓冲滑槽39，第二传动块38连接到第一缓冲滑槽32中，第一传动块34连接到第二缓冲滑槽39中；
第一缓冲滑槽32和第二缓冲滑槽39的弧度之和等于或大于转动杆7使扭丝爪子14由抱紧到打开所需转动的角度；
转动杆7与动力输入齿轮31传动连接，转动杆7还通过轴承35连接在缓冲轮37和输出轮33的中心孔中。
为增加缓冲量以适应更高的要求，优选的，所述缓冲轮37为三个，三个缓冲轮相叠置在一起，其中后一级的缓冲轮的第二传动块连接到前一级的第二缓冲滑槽中，第一缓冲滑槽和三个第二缓冲滑槽的弧度之和等于或大于转动杆7使扭丝爪子14由抱紧到打开所需转动的角度。
本发明的工作过程及工作原理：
吐丝过程:当电机正方向转动时，带动动力输入齿轮转动，由于此时缓冲轮处于触发状态即第二传动块处于第一缓冲滑槽的终端处，后一级的缓冲轮的第二传动块处于前一级的第二缓冲滑槽的终端处，第一传动块处于第二缓冲滑槽的终端处，因此，动力输入齿轮的动力被直接传送到输出轮，输出轮驱动送丝机构实现吐丝；而此时的扭丝机构的扭丝爪子处于打开状态，因此下棘爪式宽限位片限制长齿由上往下转动，扭丝机构不产生转动和滑动，具体的，转动杆虽然也与动力输入齿轮连接并随之转动，但其转向与螺纹转向相反即螺纹段的入口端与螺牙间打滑，而螺纹段并不能与螺牙相配合起来，因此扭丝机构不产生转动和轴向滑动。
扭丝过程:当吐丝到设定长度后，电机停止正转，开始反转进行扭丝动作， 电机反转时，带动动力输入齿轮反向转动，此时缓冲轮处于缓冲状态即第一缓冲滑槽转动，第一级的缓冲轮的第二传动块在第一缓冲滑槽中滑动返回至第一缓冲滑槽的始端时，第一级的缓冲轮的第二传动块被第一缓冲滑槽的始端所带动，此时，第一级缓冲轮被带动转动，第二级的缓冲轮的第二传动块在第一级的缓冲轮的第二缓冲滑槽中滑动，第二级的缓冲轮的第二传动块返回至第一级缓冲轮的第二缓冲滑槽的始端时，第二级的缓冲轮被带动，第三级的缓冲轮的第二传动块在第二级的缓冲轮的第二缓冲滑槽中滑动，第三级的缓冲轮的第二传动块返回至第二级缓冲轮的第二缓冲滑槽的始端时，第三级的缓冲轮被带动，第一传动块在第三级的缓冲轮的第二缓冲滑槽中滑动，第一传动块返回至第三级缓冲轮的第二缓冲滑槽的始端时，动力输送到输出轮处；在缓冲轮处于缓冲状态的同时，转动杆被反向带动即扭丝爪子进行抱紧，上棘爪式窄限位片限制长齿由下往上转动，同时在转动杆的螺纹段推送下长齿沿上棘爪式窄限位片向外滑动；具体的，转动杆的螺纹段与螺牙相配合起来，由于上棘爪式窄限位片限制长齿由下往上转动，因此转动杆的螺纹段只能通过螺牙推送套筒向前移动，而夹头与转动杆位置不动，从而使扭丝爪子抱住铁丝，当扭丝爪子抱住铁丝的同时长齿脱离上棘爪式窄限位片，扭丝机构产生转动，进行扭丝，由于扭丝的圈数是根据实际情况而定的，即扭的圈数不确定，因此，在送丝机构的送丝传动机构上设置有单向轴承，因此即使此时缓冲轮的缓冲状态已经结束，动力从输出轮传动到送丝动力输入齿轮时，单向轴承打滑使两送丝轮不产生转动，因此当扭丝机构在扭丝时，送丝机构不送丝；达到一电机同时驱动扭丝机构和送丝机构，且相互间互不影响。
在扭丝机构产生转动进行扭丝时，凸轮转动，凸轮的凸起端与触发端接触时，触发端被逐渐抬起，弹簧收缩，而杠杆另一端的传动部弧形下移，滑块切刀切断扎丝。当触发端与凸轮的凸起端最高端接触后，由于存在垂直落差，同时在弹簧的顶推下，杠杆的触发端被下压，与此同时，杠杆另一端的传动部迅速上行，从而使滑块切刀迅速抬升复位，避免再次送丝时滑块切刀堵塞出丝口。
在切断铁丝进行扭丝时，往往铁丝受扭力的影响在两钢筋相交处产生偏斜，偏斜的铁丝在扭紧后会产生复位导致松动的现象，为避免这种松动的现象，在扭紧方向上设置有上挡门和下挡门，具体的，在顺时针进行扭紧时，上挡门和下挡门分别对向上转动和向下转动的铁丝进行阻挡，使其不产生偏斜，保证扭丝机构能顺利扭紧而不产生松动，扭紧后，由于下收丝嘴可以沿铰接处向下转动，因此在钢筋捆扎机与铁丝分离时，下收丝嘴产生避让，使钢筋捆扎机顺利与铁丝分离，避免出现铁丝卡住而不能分离的现象发生。
复位过程:当扭丝完成后电机会立即从反转又进入正方向转动状态，此时，扭丝爪子由抱紧到打开，下棘爪式宽限位片限制长齿或短齿由上往下转动，同时在转动杆的螺纹段抽拉下长齿或短齿沿下棘爪式宽限位片向内滑动；具体的，电机正方向转动，转动杆的螺纹段即从螺牙中旋转出来，从而使扭丝爪子打开，由于下棘爪式宽限位片限制长齿或短齿由上往下转动，因此在转动杆的螺纹段 抽拉下长齿或短齿沿下棘爪式宽限位片向内滑动，此时，若是短齿沿下棘爪式宽限位片向内滑动，由于螺纹段的抽拉行程大于短齿沿下棘爪式宽限位片向内滑动的行程而短于长齿沿下棘爪式宽限位片向内滑动的行程，因此在短齿向内滑动到末端时，短齿会脱离开下棘爪式宽限位片，此时，扭丝机构产生转动，直至长齿和下棘爪式宽限位片相接触，这样的好处在于可以保证打开的两扭丝爪子处于一个设定的位置上，使扭丝爪子每一次都能准确顺利的抱紧铁丝和实现扭紧。
直至螺纹段完全旋出螺牙时，长齿卡在下棘爪式宽限位片上，套筒停止向内滑动，此时，转动杆虽然也与动力输入齿轮连接并随之转动，但其转向与螺纹转向相反即螺纹段的入口端与螺牙间打滑，而螺纹段并不能与螺牙相配合起来，因此扭丝机构不产生转动和轴向滑动。而此时，触发端处于垂直落差面的前方，滑块切刀处于出丝口的上方，保证送丝过程顺畅不被堵塞。
在扭丝爪子由抱紧到打开的同时，缓冲轮则由缓冲状态向触发状态复位，此过程与缓冲状态工作过程相反，在此不再描述。需要说明的是第一缓冲滑槽和三个第二缓冲滑槽的弧度之和等于或大于转动杆使扭丝爪子由抱紧到打开所转动的角度，这样可以保证扭丝爪子完全打开后，送丝机构再进行送丝，保证扭丝时都能稳定和连续，避免造成损坏，当完成一次捆扎后随即可进行下一次的捆扎。
所述复位弹簧安装到弹簧仓后一直处于压缩状态，复位弹簧作用在于：
1、当螺纹段完全旋出螺牙后，螺纹段的入口端与螺牙在打滑时，在复位弹簧的作用下，螺纹段始终保持与螺牙紧密接触即螺纹段的入口端与螺牙保持打滑状态而不会出现螺纹段的入口端离开螺牙，导致当转动杆转向与螺纹段转向相同时，螺纹段不能与螺牙连接起来。因此设置复位弹簧的好处在于当转动杆的转向改变成与螺纹段转向相同时，螺纹段的入口端与螺牙能迅速配合起来，使本发明工作更灵敏、工作效率更高。
2、当短齿脱离开下棘爪式宽限位片时，在复位弹簧的作用下，能保证扭丝机构产生转动使长齿和下棘爪式宽限位片相接触，避免螺纹段与螺牙间的摩擦力过小，导致螺牙不能带动外筒转动，使工作更稳定。
上述实施例为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。

Claims (17)

  1. 一种扎丝切断机构，其特征在于：包括开设有送丝槽的刀体、开设在刀体的送丝槽上的切刀滑槽、设置在切刀滑槽中可沿切刀滑槽滑动的滑块切刀以及可相对滑块切刀运动的传动部，滑块切刀在切刀滑槽中具有切断扎丝的第一位置和使滑块切刀复位的第二位置，传动部用于向滑块切刀施加驱动力，滑块切刀接收到所述驱动力后在第一位置和第二位置之间移动。
  2. 根据权利要求1所述的扎丝切断机构，其特征在于：所述滑块切刀上开设有与传动部配合的对接槽，传动部与对接槽的配合为间隙配合。
  3. 根据权利要求1所述的扎丝切断机构，其特征在于：切刀滑槽一侧边缘处凸出有防脱凸块，传动部安装在切刀滑槽另一侧，滑块切刀部分凸出于切刀滑槽，所述滑块切刀上开设有与传动部配合的对接槽，对接槽沿切刀滑槽宽度方向开设且位于凸出于切刀滑槽的滑块切刀上。
  4. 根据权利要求2或3所述的扎丝切断机构，其特征在于：沿驱动力驱动方向，所述传动部的上下两端面为弧形凸起面，传动部通过弧形凸起面装入到对接槽中；或者，传动部呈球状，所述呈球状的传动部连接到对接槽中。
  5. 根据权利要求1-3任一所述的扎丝切断机构，其特征在于：所述滑块切刀上开设有与传动部配合的对接槽，所述相对滑块切刀的运动包括传动部在对接槽中移动或在对接槽中移动且可脱离对接槽的运动。
  6. 根据权利要求1所述的扎丝切断机构，其特征在于：切刀滑槽相对送丝槽垂直或倾斜设置且切刀滑槽贯穿送丝槽。
  7. 根据权利要求1所述的扎丝切断机构，其特征在于：滑块切刀与切刀滑槽的配合为间隙配合。
  8. 根据权利要求1所述的扎丝切断机构，其特征在于：所述切刀滑槽为直槽。
  9. 一种钢筋捆扎机，其特征在于：包括权利要求1-8中任一项所述的扎丝切断机构。
  10. 根据权利要求9所述的钢筋捆扎机，其特征在于：所述钢筋捆扎机包括中部铰接的杠杆以及驱动杠杆一端摆动的驱动机构，杠杆的另一端为所述传动部，传动部与滑块切刀连接。
  11. 根据权利要求9所述的钢筋捆扎机，其特征在于：钢筋捆扎机还包括外壳以及扭丝机构，所述扭丝机构包括转动杆、夹头、防脱机构、套筒以及弹簧，所述转动杆上具有螺纹段，所述夹头包括夹头本体以及扭丝爪子，夹头本体一端具有弹簧仓，另一端与所述扭丝爪子相铰接，弹簧装在弹簧仓中，转动杆前端伸进夹头本体的弹簧仓中并通过所述防脱机构连接在弹簧仓中与弹簧相连接；
    所述套筒外表面上具有传动齿带，所述传动齿带包括一个长齿和若干个短齿，所述套筒内表面上具有与转动杆上的螺纹段相配合连接的螺牙，所述转动杆和夹头本体分别连接在套筒中，扭丝爪子还铰接在套筒上；
    外壳对应传动齿带的位置处设置有下棘爪式宽限位片和上棘爪式窄限位片；
    当扭丝爪子抱紧过程中，上棘爪式窄限位片限制长齿由下往上转动，并且在转动杆推送下长齿沿上棘爪式窄限位片向外滑动；
    当扭丝爪子由抱紧到打开过程中，下棘爪式宽限位片限制长齿或短齿由上往下转动，并且在转动杆抽拉下长齿或短齿沿下棘爪式宽限位片向内滑动；
    当扭丝爪子处于打开状态时，下棘爪式宽限位片限制长齿由上往下转动。
  12. 根据权利要求11所述的钢筋捆扎机，其特征在于：所述套筒包括内筒和外筒，内筒固定套在外筒中，内筒壁面对应转动杆的螺纹段位置处开设有嵌镶孔，所述螺牙为螺牙块，螺牙块嵌入所述嵌镶孔中，传动齿带设置在外筒的外表面上。
  13. 根据权利要求9所述的钢筋捆扎机，其特征在于：包括电机、扭丝机构以及传动系统，扭丝机构包括驱动扭丝机构将铁丝扭紧的转动杆，传动系统包括缓冲机构以及与所述电机连接的动力输入齿轮，动力输入齿轮的一侧面上具有呈弧形的第一缓冲滑槽，缓冲机构包括输出轮，输出轮一侧面上凸出有由所述第一缓冲滑槽带动的第一传动块；
    转动杆与动力输入齿轮传动连接，转动杆还滑动连接在输出轮的中心孔中；
    所述第一缓冲滑槽的弧度等于或大于转动杆使扭丝爪子由抱紧到打开所需转动的角度。
  14. 根据权利要求13所述的钢筋捆扎机，其特征在于：缓冲机构还包括缓冲轮，所述第一缓冲滑槽通过所述缓冲轮带动第一传动块，其中，所述缓冲轮一侧面凸出有第二传动块，另一侧面上具有呈弧形的第二缓冲滑槽，第二传动块连接到第一缓冲滑槽中，第一传动块连接到第二缓冲滑槽中；
    第一缓冲滑槽和第二缓冲滑槽的弧度之和等于或大于转动杆使扭丝爪子由抱紧到打开所需转动的角度；
    转动杆与动力输入齿轮传动连接，转动杆还滑动连接在缓冲轮和输出轮的中心孔中。
  15. 根据权利要求14所述的钢筋捆扎机，其特征在于：所述缓冲轮为三个，后一级的缓冲轮的第二传动块连接到前一级的第二缓冲滑槽中，第一缓冲滑槽和三个第二缓冲滑槽的长度之和等于或大于转动杆使扭丝爪子由抱紧到打开所转动的行程的长度。
  16. 根据权利要求9-15任一所述的钢筋捆扎机，其特征在于：还包括送丝机构，送丝机构包括送丝传动机构，送丝传动机构包括两送丝轮、单向轴承以及送丝动力输入齿轮，两送丝轮相啮合，两送丝轮的齿面对应设有送丝槽，送丝动力输入齿轮通过单向轴承与其中一个送丝轮相连接，输出轮与送丝动力输入齿轮连接，所述送丝机构还包括使所述两送丝轮分开或啮合的离合装置。
  17. 根据权利要求16所述的钢筋捆扎机，其特征在于：所述送丝机构还包括送丝架，离合装置包括离合驱动架、驱动架复位弹簧、连接轴以及固定块，所述离合驱动架包括上驱动片、下驱动片以及连接上驱动片和下驱动片的连接片，上驱动片和下驱动片上对应开设有连接槽，连接轴穿过所述两连接槽，连接轴两端分别伸出于上驱动片和下驱动片，与单向轴承连接的送丝轮连接在连接轴的中部，另一个送丝轮则连接在上驱动片和下驱动片之间，连接轴上端转动连接在所述送丝架上，下端连接在所述单向轴承中，所述固定块伸进连接槽中，且与驱动架复位弹簧的一端连接，驱动架复位弹簧另一端连接在连接片上。
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