WO2016008153A1 - 大力钳 - Google Patents

大力钳 Download PDF

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Publication number
WO2016008153A1
WO2016008153A1 PCT/CN2014/082493 CN2014082493W WO2016008153A1 WO 2016008153 A1 WO2016008153 A1 WO 2016008153A1 CN 2014082493 W CN2014082493 W CN 2014082493W WO 2016008153 A1 WO2016008153 A1 WO 2016008153A1
Authority
WO
WIPO (PCT)
Prior art keywords
handle
locking
guide rod
pliers
carrier
Prior art date
Application number
PCT/CN2014/082493
Other languages
English (en)
French (fr)
Inventor
王暋
Original Assignee
杭州巨星工具有限公司
杭州巨星科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 杭州巨星工具有限公司, 杭州巨星科技股份有限公司 filed Critical 杭州巨星工具有限公司
Priority to PCT/CN2014/082493 priority Critical patent/WO2016008153A1/zh
Priority to US15/327,022 priority patent/US10272545B2/en
Publication of WO2016008153A1 publication Critical patent/WO2016008153A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/12—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears
    • B25B7/123—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears with self-locking toggle levers

Definitions

  • the present invention relates to a hand tool, and more particularly to a power tong.
  • the pliers are mainly used for clamping parts to facilitate the processing of parts, such as clamping parts for riveting, welding, grinding, etc. Compared with ordinary pliers, the jaws of the pliers can generate a large clamping force to keep the parts not. Loose and affect processing. In addition, the pliers can also be used as a wrench.
  • Ordinary pliers generally include a pliers head and a handle, and the force acting on the handle is converted into a force acting on the pliers by a lever principle conversion. However, once the force acting on the handle disappears, the jaws are naturally released and the workpiece cannot be held continuously. Since the pliers use the principle of the lever twice, the force acting on the handle is converted by the principle of two levers, and finally the clamping force that is formed at the jaws several times the applied force.
  • Patent No. US6591791 and US6776072 discloses an adjustable pliers that does not require pre-adjustment of the jaw size and can be locked when clamping jaws of different sizes.
  • the linkage of the pliers between the two handles includes an arm pivoted to the handle and a cam pivoted to the arm, the locking element being pivoted to the cam.
  • the adjusting element is mounted on the arm and can interact with the cam. By adjusting the position of the adjusting element, the clamping force of the jaw can be adjusted.
  • the locking is achieved from the force input point on the handle to the locking element, and there is an intermediate link between the arm and the cam in the middle, and the presence of these two links results in a weak support rigidity.
  • the locking element is a locking block that is locked by a change in the angle of the guide rod.
  • a single locking block requires a high degree of precision in order to form a friction with the guide rod to generate a frictional force for effective locking.
  • the high production precision needs to be produced by the precision casting process, but the production cost of the precision casting is high.
  • the assembly process of the pliers in addition to the lock block can be quickly placed on the guide rod, the remaining components such as cams, arms and adjustment components must be installed separately, the installation process is relatively cumbersome.
  • the existing pliers have the defects that the support of the connecting rod portion is not strong, the locking effect is not high, the production cost is high, and the assembly is complicated.
  • the distal end in the present invention refers to the end away from the collet, and the proximal end refers to the end adjacent to the collet.
  • the present invention provides a support portion of the connecting rod to support rigidity and improve the locking efficiency. , pliers with reduced production costs and reduced assembly complexity.
  • the pliers of the present invention comprises a first collet, a second collet, a first handle and a second handle, the first collet is mounted to the first handle, and the second collet is pivotally mounted to the first handle And pivotally mounted to the second handle by a first attachment point, the power tong further comprising a single link and a sliding mechanism, one end of the link being pivotally mounted to the second handle by a second connection point, The other end is pivotally mounted to the sliding mechanism by a third attachment point, the sliding mechanism is slidably mounted on the first handle; a locking mechanism for locking the forceps; and for adjusting the forceps clamping Force adjustment mechanism.
  • one end of the connecting rod and the sliding mechanism is constituted by a curved section, and the curvature of the curved section near the first handle is larger than the curvature of the curved section away from the first handle.
  • the connecting rod is made of a high-strength material such as medium-carbon high-strength carbon structural steel or high-carbon steel.
  • connecting rod is mounted to the second handle by the rivet at the second connection point, and is mounted to the sliding mechanism by the pin at the third connection point.
  • the locking mechanism of the power tong of the present invention is slidably mounted to the second handle and located on the distal end side of the sliding mechanism adjacent to the first handle.
  • the locking mechanism includes a guiding rod and a locking piece, the guiding rod is disposed on the locking piece, and the guiding rod is mounted on the first handle.
  • the locking piece is a multi-piece stack, and the plurality of locking pieces are attached to each other.
  • the guide rod has a rounded trapezoidal cross section
  • the middle of the locking piece has a guide rod passing through the hole
  • the hole is arranged to have a rounded trapezoid shape having the same cross-sectional shape as the guide rod, and the guide rod and the locking piece are Clearance fit.
  • the adjustment mechanism of the power tong is mounted on the guide rod between the sliding mechanism and the locking mechanism, and the adjustment mechanism is configured to be displaceable in the longitudinal direction of the guide rod.
  • the adjustment mechanism is configured such that when the adjustment mechanism reaches a maximum displacement toward either end of the guide rod, the end of the link connected to the slide mechanism can be in contact with the adjustment mechanism when the forceps is locked.
  • the adjustment mechanism includes an adjustment screw and a carrier, the carrier is mounted on the guide rod, the adjustment screw is mounted on the carrier, and displacement along the guide rod relative to the carrier occurs.
  • the carrier has the same cross section as the locking piece and has the same size as the locking piece at the same position as the locking piece, and the guiding rod passes through the hole in the carrier.
  • the power tong further includes a third handle pivotally mounted on the second handle and configured to: when the third handle is away from the pivot point, the second handle is closer to the second handle One end of the three handles near the pivot point can act on the link.
  • the portion of the connecting rod that interacts with the third handle has a circular arc-shaped projection.
  • the power tong of the present invention comprises a first collet, a second collet, a first handle and a second handle, the first collet is mounted to the first handle, and the second collet is pivotally mounted to The first handle is pivotally mounted to the second handle by a first connection point, the power tong further comprising a link mechanism and a sliding mechanism, the one end of the link mechanism being pivotally mounted to the second connection point to The second handle is pivotally mounted to the sliding mechanism by a third attachment point, and the sliding mechanism is slidably mounted on the first handle.
  • link mechanism is a single link.
  • one end of the connecting rod connected to the sliding mechanism is curved, and the curvature near the first handle portion is larger than the curvature away from the first handle portion.
  • the power tong of the present invention further includes a locking mechanism slidably mounted to the second handle and located adjacent the distal end side of the first handle.
  • the locking mechanism includes a guiding rod and a locking piece, the guiding rod is disposed on the locking piece, and the guiding rod is mounted on the first handle.
  • the pliers further includes an adjustment mechanism mounted on the guide bar between the sliding mechanism and the locking mechanism, the adjustment mechanism being configured to be displaceable in the length direction of the guide bar.
  • the adjustment mechanism includes an adjustment screw and a carrier, the carrier is mounted on the guide rod, the adjustment screw is mounted on the carrier, and displacement along the guide rod relative to the carrier occurs.
  • the power tong further includes a third handle pivotally mounted on the second handle and configured to: when the third handle is away from the pivot point, the second handle is closer to the second handle One end of the three handles near the pivot point can act on the link.
  • the portion of the connecting rod that interacts with the third handle has a circular arc-shaped projection.
  • the pliers of the present invention regardless of the size of the workpiece to be clamped, can be clamped as long as it is not larger than the maximum distance between the two collets of the pliers, and the distance between the collets need not be adjusted in advance to adapt to different The size of the workpiece.
  • the adaptation to different sizes of workpieces is mainly achieved by the distance of the slider on the guide rod.
  • the connecting rod of the pliers of the present invention is a single connecting rod, one end is connected with the handle, the other end is connected with the sliding mechanism, and the connecting rod is made of high-strength material, so that the supporting rigidity of the connecting rod can be improved.
  • the fit between the adjustment mechanism and the connecting rod can adjust the clamping force between the collets.
  • the action time of the adjusting mechanism and the connecting rod is earlier, that is, after the adjusting device is displaced toward the chucking direction in the present invention, the initial angle between the second handle and the connecting rod when the locking is started becomes larger, thereby The clamping force generated at the collet also increases.
  • the action time of the adjusting mechanism and the connecting rod becomes late, that is, after the adjusting device is displaced away from the chuck in the present invention, the initial angle between the second handle and the connecting rod is started when the locking is started. Small, whereby the clamping force generated at the collet is also reduced.
  • the locking mechanism is composed of a plurality of locking pieces, and when the plurality of locking pieces are locked and the friction of the guiding rod is locked, the sequence may be sequential, and a plurality of pieces of the locking piece may be generated on the guiding rod.
  • the friction is applied, the locking can be performed.
  • the effective friction between the locking piece and the guiding rod is high, a more effective locking can be produced.
  • the second connection point is located near the first handle side of the first connection point and the third connection point, the resulting locking effect can be maintained with the application of force removed.
  • the provision of multiple locking tabs reduces the need for punching accuracy of the locking tabs, thereby reducing manufacturing costs.
  • the sliding mechanism, the adjusting mechanism and the locking mechanism each have a hole through which the guide rod passes.
  • Fig. 1 is a cross-sectional view showing a state in which a large-sized forceps of the present invention is locked without gripping a workpiece.
  • FIG. 2 is a schematic illustration of a guide rod of a particular embodiment of a pliers of the present invention.
  • FIG 3 is a side elevational view of a guide rod of one embodiment of the pliers of the present invention.
  • FIG. 4 is a schematic illustration of a locking tab of one embodiment of the pliers of the present invention.
  • Figure 5 is a schematic illustration of an adjustment mechanism of one embodiment of the pliers of the present invention.
  • Figure 6 is a schematic illustration of the carrier of the adjustment mechanism of one embodiment of the pliers of the present invention.
  • Figure 7 is a side elevational view of the carrier of the adjustment mechanism of one embodiment of the pliers of the present invention.
  • Figure 8 is a schematic illustration of a slider of one embodiment of the pliers of the present invention.
  • Figure 9 is a plan view of a slider of one embodiment of the pliers of the present invention.
  • Figure 10 is a schematic illustration of a linkage of one embodiment of a pliers of the present invention.
  • Figure 11 is a schematic illustration of a first support sheet of one embodiment of the pliers of the present invention.
  • Figure 12 is a schematic illustration of a second support sheet of one embodiment of the forceps of the present invention.
  • Figure 13 is a schematic illustration of a third support sheet of one embodiment of the forceps of the present invention.
  • Figure 14 is a schematic illustration of a third handle of one embodiment of the pliers of the present invention.
  • Figure 15 is a cross-sectional view showing a specific embodiment of the pliers of the present invention in an open state.
  • Figure 16 is a cross-sectional view showing a state in which the workpiece of the present invention is clamped in a state in which the workpiece is clamped.
  • the forceps includes a first collet 1 , a second collet 2 , and a first handle 3 . , the second handle 4 .
  • the first collet 1 is fixedly mounted on the first handle 3
  • the second collet 2 is substantially L-shaped
  • the second collet 2 passes through the first connection point at the L-shaped turning point 21
  • Mounted to the second handle 4 an L-shaped arm of the second collet 2 is also mounted to the first handle 3 via a fourth attachment point 22.
  • Second chuck 2 at the first connection point 21 It is mounted to the second handle 4 by rivets, and is attached to the first handle 3 by rivets at the fourth joint point 22.
  • the second chuck 2 can be wound around the first connection point 21 relative to the second handle 4 Relative pivoting occurs, and relative pivoting relative to the first handle 3 can also occur about the fourth attachment point 22.
  • a hole 23 is defined between the first connection point 21 and the fourth connection point 22 of the second chuck 2, and one end of the first spring 5 is connected to the hole In 23, the other end of the first spring 5 is connected to the back of the first handle 3.
  • the back of the first handle 3 has an indented section 31 through which the first spring 5 passes and the first handle 3 connected.
  • the first spring 5 and the first handle 3 can also be connected by other means. The position of the indented section 31 adjacent to the first chuck 1 and the first handle 3 Connected, trapped in the first handle 3 in a position away from the first collet 1.
  • the position of the invagination section 31 on the first chuck 3 relative to the second chuck 2 relative to the first chuck 3 The position is closer to the distal end of the first handle 3.
  • the first spring 5 is a tension spring. When the power tong is in the open position, the first spring 5 is affected by its resilience, and the second chuck 2 is moved away from the first chuck 1 The direction of pulling produces the maximum open position of the first collet 1 and the second collet 2.
  • the guide rod 6 has a rounded trapezoidal cross section, that is, the main shape of the guide rod 6 is an isosceles trapezoid, and the upper bottom surface 61 The length is smaller than the length of the lower bottom surface 62, and the four corners of the isosceles trapezoid are provided with rounded corner transitions.
  • the upper bottom surface 61 of the rounded trapezoid has a slit 63.
  • Guide rod 6 A second spring 7 is mounted on a side close to the distal end of the first handle 3.
  • a locking mechanism is disposed on the guide rod 6 of the proximal end of the second spring 7 (i.e., the side near the collet).
  • the locking mechanism 8 is composed of three pieces of locking pieces 81.
  • the number of locking tabs 81 can be varied when the locking tabs 81 When the number is increased, the resulting locking effect is better.
  • the upper portion 82 of the locking piece 81 has a rounded trapezoidal hole 83 of the same shape as the cross section of the guide rod 6. Locking plate 81 through rounded trapezoidal hole 83 A clearance fit with the guide rod 6 is achieved.
  • the 3-piece locking tabs 81 are mounted on the guides 6 in sequence.
  • the locking mechanism 8 is equipped with an adjustment mechanism 9 on the side close to the collet. Further, in the present embodiment, the adjustment mechanism 9 is provided by the carrier 91. And the adjustment screw 92 is composed (as shown in Figure 5). As shown in Fig. 6 and Fig. 7, the two sides of the carrier 91 are a plane 911 and a stepped surface 912, respectively. Plane 911 along the step surface 912 The rising aspect is inclined upward, and the flat surface 911 has the same cross-sectional shape as the locking piece 81 and can be fitted to the locking piece 81. The stepped surface 912 of the carrier 91 faces the collet side of the pliers.
  • Carrier 91 The stepped surface 912 the raised portion 915 has a through hole 913, and the carrier 91 is mounted on the guide rod 6 through the through hole 913.
  • Cross-sectional shape of the through hole 913 and the guide rod 6 The cross-sectional shape is substantially the same, and the portion of the through-hole 913 close to the stepped surface 912 is flared.
  • the flared portion allows the carrier 91 to be opposed to the guide 6 during the locking process.
  • the swinging of the distal end of the handle causes a force on the locking piece 81 to cause friction between the locking piece 81 and the guide rod 6. .
  • the lower step portion 916 of the carrier 91 stepped surface 912 has a through hole 914, the adjusting screw 92 is mounted in the through hole 914 and can be displaced along the through hole.
  • the head of the adjusting screw 92 faces the side of the chuck.
  • the adjustment mechanism 9 is provided with a sliding mechanism 10 on the side close to the chuck. Further, in the specific embodiment, the sliding mechanism 10 is a slider 101. As shown in Fig. 8 and Fig. 9, the slider 101 has a U-shaped structure, and the U-shaped joint has a rounded trapezoidal hole 102, a rounded trapezoidal hole 102 of the slider 101 and a locking piece 81. The upper rounded trapezoidal hole 83 is the same size, and the slider 101 is threaded on the guide rod 6 through the rounded trapezoidal hole 102 located thereon. A through hole is provided in the two arms 103 of the U-shaped structure of the slider 101 104.
  • one end portion 111 of the link 11 is attached to the second handle 4 by rivets, and the other end portion is provided.
  • 112 is mounted between the arms 103 of the slider 101 by pins.
  • the connecting rod 11 and the second handle 4 and the slider 101 can have other connections.
  • Connecting rod 11 The end portion 112 is a multi-segment curve, the curvature of the curved portion of the end portion 112 near the back 113 of the connecting rod is large, and the curvature of the curved portion away from the back portion 113 is small.
  • End 112 of the connecting rod 11 It is configured to be in contact with the adjustment screw 92 of the adjustment mechanism 9 when the workpiece is clamped.
  • the link 11 has a curved section having a small curvature
  • the link is allowed to push the slider 101. Move toward the distal end of the handle.
  • the connecting rod 11 is rotated by a certain angle around the second connecting point 16
  • the curved section having a large curvature starts to contact the adjusting screw 92, and applies a force to the adjusting screw 92, and the adjusting screw 92
  • the force is transmitted to the carrier 91 and further transmitted to the locking piece 81, which finally achieves locking.
  • the end 112 of the connecting rod 11 The setting of the curved segments with different curvatures allows the forceps to clamp the workpieces of different sizes without first adjusting the size between the two chucks, and completing the connecting rods 11 by the curved segments with small curvature. Pushing, through the curve section with large curvature, the action of the connecting rod 11 on the adjusting screw 92 is completed, so that the forceps starts to lock and the link 11 is started when the locking is started. Consistent with the angle formed by the second handle, the self-adjusting function of the chuck is achieved.
  • the link 11 also has a circular arc-shaped projection 114 on the opposite side of the link back 113.
  • the guide rod 6 passes through the first support piece 12 and the second support piece 13 And the third support piece 14 is mounted to the first handle 3.
  • the first support piece 12 has a T-shaped outer shape, and the two ends 121 extending from the T shape can be combined with the first handle 3
  • the groove provided on the upper surface is fitted to the first handle 3 by an interference fit.
  • the first support sheet 12 can also be attached to the first handle 3 by welding or the like.
  • First support piece 12 There is a hole 122 in the middle, and the hole 122 is rounded trapezoidal and can be made to cooperate with the end of the guide rod 6 having the slit 63.
  • the second support piece 13 and the third support piece 14 are used in combination.
  • Second support piece 13 There is a protruding portion 131 having a diameter smaller than the diameter of the body 132 of the second support piece 13.
  • the second support piece 13 has a hole 133 in the middle, and the hole 133 It is a rounded trapezoid that can be mated with the end of the guide rod 6 without a slit.
  • the third support piece 14 has a T-shaped outer shape, and the T-shape has two protrusions 141 which are symmetric along the center line, and the protrusions 141 Extending to a side of the third support piece 14 by a certain distance, the T-shaped projecting ends of the third support piece 14 can be interference-fitted with the grooves provided on the first handle 3.
  • the third support piece 14 It can also be attached to the first handle 3 by welding or the like.
  • the second support piece 13 and the third support piece 14 are used in combination, and the protruding portion 131 and the third supporting piece 14 on the second supporting piece 13 are used.
  • the space defined between the two protrusions 141 is engaged.
  • the third support piece 14 has no opening in the middle, and its side surface provides a certain supporting function for the guide rod 6.
  • the power tong of the present embodiment further has a third handle 15 and a third handle 15 It is arcuate and is pivotally mounted to the second handle 4 by rivets.
  • the third handle 15 can also be pivotally mounted to the second handle 4 by other means.
  • Third handle 15 One end portion 151 can contact the projection 114 of the connecting rod 11 under certain conditions and exert a force thereon.
  • the other end 152 of the third handle 15 can follow the third handle 15 The pivot is close to or away from the second handle 4 .
  • the end portion 152 is adjacent to the second handle 4
  • the end portion 151 is away from the second handle 4; when the end portion 152 is away from the second handle 4, the end portion 151 It is close to the second handle 4 .
  • the state thereof is as shown in FIG.
  • the user can grasp the first handle by hand 3
  • the finger pulls the second handle 4, applying a force to the second handle 4 toward the first handle 3, causing the second handle 4 to pivot about the first connection point 21.
  • the second chuck 2 Pivot around the fourth connection point 22, gradually approaching the first collet 1 .
  • the first chuck 1 and the second chuck 2 are in close contact with the workpiece, the first chuck 1 and the second chuck 2
  • the relative position is no longer changed and the two collets are in a substantially parallel state.
  • the second handle 4 continues to move about the first attachment point 21 toward the first handle 3 under the force applied by the user.
  • the connecting rod 11 Due to the force transmitted from the second connection point 16, since the connecting rod 11 is a rigid structure, the slider 101 is pressed along the guide rod 6 Movement to the distal end of the first handle, during which the relative positions of the two collets do not change.
  • the slider 101 is sequentially connected to the adjustment mechanism 9, the locking mechanism 8 and the second spring 7, in the slider 101
  • the adjusting mechanism 9 and the locking mechanism 8 also move along the guide rod 6 toward the distal end of the first handle, and the locking mechanism 8 presses the second spring 7 to compress.
  • the connecting rod The end 112 of the 11 is in contact with the head 921 of the adjusting screw 92 on the adjustment mechanism 9. Referring to FIG.
  • the second spring 7 when the forceps of the present embodiment does not clamp the workpiece, the second spring 7 is locked.
  • the degree of compression is less than the degree of compression when the workpiece is clamped. The larger the workpiece being clamped, the greater the degree to which the second spring 7 is compressed.
  • the second handle 4 When the end 112 of the connecting rod 11 comes into contact with the head 921 of the adjusting screw 92, the second handle 4 The applied force acts further on the adjustment screw 92, since the carrier 91 of the adjustment mechanism 9 is in clearance fit with the guide rod 6, and the through hole 913 of the carrier 91 It is a flare-like enlarged through hole, so that the carrier 91 is inclined with respect to the guide rod 6 under the force of the adjustment screw 92 toward the distal end of the first handle 3. The inclination of the carrier 91 further acts on the locking piece 81 Upper, the locking piece 81 is inclined relative to the guide rod 6, respectively.
  • the edge of the rounded trapezoidal hole 83 of the locking piece 81 generates friction with the guide rod 6, and the second connection point 16 at the first connection point 21 and the third connection point 17
  • the locking of the forceps is generated.
  • the clamping force of the chuck does not disappear due to the disappearance of the force applied to the handle. In this process, more than 1 piece of locking piece 81 To some extent, the requirement for punching precision of the locking piece is reduced, and a gap is allowed between the locking pieces 81.
  • the locking piece 81 When the locking piece 81 forms a certain inclination angle with the guiding rod 6, the locking piece 81 always has a guiding rod 6 Friction is generated to achieve locking. At this time, the projection 114 on the link 11 abuts against one end 151 of the third handle 15 so as to be in close contact with the second handle 4, and the other end 152 Keep away from the second handle 4 . After locking, the pliers can firmly clamp the workpiece.
  • the force toward the second handle 4 is first applied to the end 152 of the third handle 15, the third handle 15 Rotating pivotally, its end 151 moves away from the second handle 4 and exerts a force on the projection 114 of the link 11 away from the second handle 4.
  • the connecting rod 11 By pivoting about the second attachment point 16, the end 112 of the link 11 moves relative to the adjustment screw 92, and the force on the adjustment screw 92 is gradually reduced.
  • a force is applied in a direction away from the phase such that the end 112 of the link 11 is disengaged from the adjustment screw 92.
  • the adjustment screw 92 can be displaced in the through hole 914 of the carrier 91.
  • adjusting screw 92 When adjusting screw 92 When a certain displacement occurs in the direction of the chuck, the connecting rod 11 and the adjusting screw 92 come into contact earlier than before the unadjusted. This means that the locking piece 81 is tilted to the guide rod 6 The frictional force begins to lock and after the final locking is completed, the clamping force formed between the two collets is greater than before the unadjusted. In other words, when adjusting the screw 92 When the displacement is made toward the chuck, a larger clamping force can be generated.
  • the forceps of the present embodiment have been tested, and when a pressure sensor having a thickness of 25 mm is sandwiched between the two chucks, the tail end of the second handle is applied. With a load of 15kg, the clamping force between the two chucks is 350kg. When clamping a 20mm round rod, a load of 12.8kg is applied to the second handle, and the maximum torque between the two chucks is 52N*M. When clamping a hexagonal bar with a 20mm opposite side, a load of 14.5kg on the second handle, the maximum torque between the two chucks is 103.5N*M.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)

Abstract

一种大力钳，包括第一夹头（1）、第二夹头（2）、第一手柄（3）和第二手柄（4），第一夹头（1）安装到第一手柄（3）上，第二夹头（2）可枢转地安装到第一手柄上（3），并通过第一连接点（21）可枢转地安装到第二手柄（4）上，该大力钳还包括单个连杆（11）、滑动机构（10）和锁紧机构（8），连杆（11）的一端通过第二连接点（16）可枢转地安装到第二手柄（4）上，另一端通过第三连接点（17）可枢转地安装到滑动机构（10）上，滑动机构（10）和锁紧机构（8）可滑动地安装在所述第一手柄（3）上。单个连杆（11）提高了连杆的支撑强度，多个锁片（81）的设置提高了锁紧的效率，也降低了锁片的加工成本，锁紧机构（8）和滑动机构（10）穿设在导杆（6）上，简化了装配工艺。

Description

大力钳
技术领域
本发明涉及一种手动工具，尤其涉及一种大力钳。
背景技术
大力钳主要用于夹持零件便于零件加工，如夹持零件以进行铆接、焊接、磨削等加工，相对于普通的钳子，大力钳的钳口可以产生较大的夹紧力以保持零件不松脱而影响加工。此外，大力钳还可以当扳手使用。
普通的钳子一般包括钳头和手柄，作用在手柄上的力，经过杠杆原理的转换，转变成钳头上变大的作用力。但是，一旦作用在手柄上的力消失，钳口自然就松开，不能继续夹持工件。大力钳由于两次使用了杠杆的原理，因此，作用在手柄上的力通过两次杠杆原理转化，最终能在钳口处形成的几倍于施加力的夹紧力。
专利号为 US6591791 和 US6776072 的专利，公开了一种可调节的大力钳，其钳口夹持不同尺寸工件时，不需要预先调节钳口大小，并可实现锁紧。该大力钳在两个手柄之间的连杆装置包括臂和凸轮，臂枢接到手柄上，凸轮枢接到臂上，锁定原件枢接到凸轮上。调节元件安装在臂上，并能与凸轮相互作用，通过对调节元件位置的调整，可以起到调节钳口夹紧力的目的。从上述专利的描述中可以看出，从手柄上的力输入点到锁紧元件实现锁紧，中间存在臂和凸轮的中间环节，这两个环节的存在导致了支撑刚性不强。另外，上述专利的描述及附图中可见，锁紧元件是一个锁块，通过与导杆角度的变化实现锁紧。但是，从锁紧的有效性考虑，单个的锁块需要很高的精度，才能与导杆形成贴合产生摩擦力从而有效锁紧。而高的生产精度，需要通过精铸的工艺生产，但是精铸的生产成本较高。在大力钳的装配过程中，除了锁块能快速穿设在导杆上，其余部件如凸轮、臂和调节元件都要分别进行安装，安装过程比较繁琐。
因此，现有的大力钳存在着连杆部分支撑刚性不强、锁紧有效性不高、生产成本高以及装配复杂的缺陷。
发明内容
本发明中的远端是指远离夹头的一端，近端是指靠近夹头的一端。
有鉴于现有技术的大力钳存在连杆部分支撑刚性不强、锁紧有效性不高、生产成本高以及装配复杂的缺陷，本发明提供了一种连杆部分支撑刚性加强、锁紧效率提高、生产成本降低以及装配复杂度降低的大力钳。
本发明的大力钳，包括第一夹头、第二夹头、第一手柄和第二手柄，第一夹头安装到第一手柄上，第二夹头可枢转地安装到第一手柄上，并通过第一连接点可枢转地安装到第二手柄上，该大力钳还包括单个连杆和滑动机构，连杆的一端通过第二连接点可枢转地安装到第二手柄上，另一端通过第三连接点可枢转地安装到滑动机构上，滑动机构可滑动地安装在所述第一手柄上；用于锁紧大力钳的锁紧机构；以及用于调节大力钳夹紧力的调节机构。
进一步地，连杆与滑动机构连接的一端由曲线段构成，且靠近第一手柄的曲线段曲率比远离第一手柄的曲线段曲率大。
进一步地，连杆由高强度材料制成，如中碳高强度碳素结构钢或高碳钢制成。
进一步地，连杆在所述第二连接点上通过铆钉安装到第二手柄上，在第三连接点上通过销钉安装到滑动机构上。
进一步地，本发明的大力钳的锁紧机构可滑动地安装到第二手柄上，并位于滑动机构靠近第一手柄远端侧。
进一步地，锁紧机构包括导杆和锁片，导杆穿设在锁片上，导杆安装在所述第一手柄上。
进一步地，锁片为多片叠用，多片锁片互相贴合。
进一步地，导杆的横截面为圆角梯形，锁片的中间具有供导杆穿过孔，该孔被设置为具有与导杆的横截面形状相同的圆角梯形，导杆与锁片为间隙配合。
进一步地，该大力钳的调节机构安装在导杆上，位于滑动机构和锁紧机构之间，调节机构被配置为在导杆的长度方向上能够发生位移。
进一步地，该调节机构被配置为，当调节机构朝向导杆的任一端达到最大位移，在大力钳进行锁紧时，连杆与滑动机构相连的一端都能与调节机构接触。
进一步地，该调节机构包括调节螺钉和载体，载体安装在导杆上，调节螺钉安装在载体上，并能相对于载体发生沿导杆方向的位移。
进一步地，该载体的横截面与所述锁片的横截面相同，并在与锁片相同的位置具有与锁片形状大小相同的孔，导杆穿过载体上的孔。
进一步地，该大力钳还包括第三手柄，第三手柄可枢转地安装在第二手柄上，并被配置为：当第三手柄远离枢转点的一端靠近所述第二手柄时，第三手柄靠近枢转点的一端能作用于所述连杆。
进一步地，连杆与第三手柄相作用的部位具有圆弧型凸起。
可选择地，本发明的大力钳，包括第一夹头、第二夹头、第一手柄和第二手柄，第一夹头安装到第一手柄上，第二夹头可枢转地安装到第一手柄上，并通过第一连接点可枢转地安装到第二手柄上，该大力钳还包括连杆机构和滑动机构，连杆机构的一端通过第二连接点可枢转地安装到第二手柄上，另一端通过第三连接点可枢转地安装到滑动机构上，滑动机构可滑动地安装在所述第一手柄上。
进一步地，该连杆机构为单个的连杆。
进一步地，连杆与滑动机构连接的一端为曲线，且靠近第一手柄部分的曲率较比远离第一手柄部分的曲率大。
进一步地，本发明的大力钳还包括锁紧机构，该锁紧机构可滑动地安装到第二手柄上，并位于滑动机构靠近第一手柄远端侧。
进一步地，锁紧机构包括导杆和锁片，导杆穿设在锁片上，导杆安装在所述第一手柄上。
进一步地，该大力钳还包括调节机构，该调节机构安装在导杆上，位于滑动机构和锁紧机构之间，调节机构被配置为在导杆的长度方向上能够发生位移。
进一步地，该调节机构包括调节螺钉和载体，载体安装在导杆上，调节螺钉安装在载体上，并能相对于载体发生沿导杆方向的位移。
进一步地，该大力钳还包括第三手柄，第三手柄可枢转地安装在第二手柄上，并被配置为：当第三手柄远离枢转点的一端靠近所述第二手柄时，第三手柄靠近枢转点的一端能作用于所述连杆。
进一步地，连杆与第三手柄相作用的部位具有圆弧型凸起。
本发明的大力钳，不论待夹紧的工件的尺寸，只要不大于大力钳两个夹头之间的最大距离，都可以进行夹持，并且不需要预先调节夹头之间的距离以适应不同工件的大小。对不同大小工件的适应，主要依靠滑块在导杆上的运动距离实现。
本发明的大力钳的连杆为单个连杆，一端连接手柄，另一端连接滑动机构，且连杆由高强度的材料制成，这样就可以提高连杆的支撑刚性。
调节机构与连杆之间的配合可以调节夹头之间的夹紧力。当调节机构与连杆的作用时间提早时，即本发明中调节装置朝向夹头方向发生位移后，第二手柄和连杆之间在开始进行锁紧时的初始夹角变大，由此，在夹头处产生的夹紧力也会增大。当调节机构与连杆的作用时间变晚时，即本发明中调节装置向背离夹头的方向发生位移后，第二手柄和连杆之间之间在开始进行锁紧时的初始夹角变小，由此，在夹头处产生的夹紧力也会减小。
此外，锁紧机构由多片锁片构成，多片锁片在发生倾斜及对导杆产生摩擦作用进行锁紧时，可以有先后的顺序，并且多片锁片在其中一部分能对导杆产生摩擦力时可进行锁紧，当锁片与导杆的有效摩擦力高时，能产生更有效的锁紧。在第二连接点位于第一连接点和第三连接点的靠近第一手柄侧时，产生的锁紧效果可以在撤销施加力的情况下继续维持。
多锁片的的设置降低了对锁片冲裁精度的要求，从而降低了制造成本。此外，滑动机构、调节机构和锁紧机构都具有供导杆穿过的孔，在装配时，上述三机构可以简单快速的穿设到导杆上，因此装配工艺简单。
附图说明
图 1 是本发明的大力钳的一个具体实施方式在不夹持工件的锁紧状态剖面图。
图 2 是本发明的大力钳的一个具体实施方式的导杆的示意图。
图 3 是本发明的大力钳的一个具体实施方式的导杆的侧视图。
图 4 是本发明的大力钳的一个具体实施方式的锁片的示意图。
图 5 是本发明的大力钳的一个具体实施方式的调节机构示意图。
图 6 是本发明的大力钳的一个具体实施方式的调节机构的载体的示意图。
图 7 是本发明的大力钳的一个具体实施方式的调节机构的载体的侧视图。
图 8 是本发明的大力钳的一个具体实施方式的滑块的示意图。
图 9 是本发明的大力钳的一个具体实施方式的滑块的俯视图。
图 10 是本发明的大力钳的一个具体实施方式的连杆的示意图。
图 11 是本发明的大力钳的一个具体实施方式的第一支撑片的示意图。
图 12 是本发明的大力钳的一个具体实施方式的第二支撑片的示意图。
图 13 是本发明的大力钳的一个具体实施方式的第三支撑片的示意图。
图 14 是本发明的大力钳的一个具体实施方式的第三手柄的示意图。
图 15 是本发明的大力钳的一个具体实施方式在打开状态的剖面图。
图 16 是本发明的大力钳的一个具体实施方式在夹持工件的锁紧状态剖面图。
具体实施方式
如图 1 所示，本发明的大力钳的一个具体实施方式中，大力钳包括第一夹头 1 、第二夹头 2 、第一手柄 3 、第二手柄 4 。第一夹头 1 固定安装在第一手柄 3 上，第二夹头 2 大致为 L 型，第二夹头 2 通过位于 L 型转折点处的第一连接点 21 安装到第二手柄 4 上，第二夹头 2 的 L 型的一个臂还通过第四连接点 22 安装到第一手柄 3 上。第二夹头 2 在第一连接点 21 处通过铆钉安装到第二手柄 4 上，在第四连接点 22 处通过铆钉安装到第一手柄 3 上。第二夹头 2 可以绕第一连接点 21 相对第二手柄 4 发生相对枢转，也可以绕第四连接点 22 相对于第一手柄 3 发生相对枢转。
第二夹头 2 的第一连接点 21 和第四连接点 22 之间设有一孔 23 ，第一弹簧 5 的一端连接到该孔 23 中，第一弹簧 5 的另一端与第一手柄 3 的背部相连。具体地，第一手柄 3 的背部具有一内陷区段 31 ，第一弹簧 5 通过该内陷区段 31 与第一手柄 3 相连。本领域技术人员可知，第一弹簧 5 与第一手柄 3 还可以通过其他方式连接。上述内陷区段 31 靠近第一夹头 1 的位置与第一手柄 3 相连，在远离第一夹头 1 的位置内陷入第一手柄 3 内。该内陷区段 31 在所述第一夹头 3 上的位置，相对于第二夹头 2 相对于第一夹头 3 的位置，更靠近第一手柄 3 的远端。第一弹簧 5 为拉力弹簧，当大力钳处于打开位置时，第一弹簧 5 受其回弹力的影响，将第二夹头 2 向远离第一夹头 1 的方向拉，产生第一夹头 1 和第二夹头 2 的最大打开位置。
如图 2 和图 3 所示，导杆 6 的横截面为圆角梯形，即导杆 6 的主体形状为等腰梯形，上底面 61 的长度小于下底面 62 的长度，该等腰梯形的四个角设置有圆角过渡。在导杆 6 的一端 64 ，圆角梯形的上底面 61 具有切口 63 。导杆 6 在靠近第一手柄 3 远端的一侧安装有第二弹簧 7 。第二弹簧 7 的近端（即靠近夹头的一侧）的导杆 6 上穿设有锁紧机构 8 。进一步地，在本具体实施方式中，锁定机构 8 由 3 片锁片 81 组成。本领域的技术人员可知，锁片 81 的数量可变，当锁片 81 数量增加时，产生的锁紧效果更好。如图 4 所示，锁片 81 的上部 82 具有与导杆 6 横截面相同形状的圆角梯形孔 83 。锁片 81 通过圆角梯形孔 83 实现与导杆 6 的间隙配合。 3 片锁片 81 依次安装在导杆 6 上。
锁紧机构 8 靠近夹头的一侧安装有调节机构 9 。进一步地，在本具体实施方式中，调节机构 9 由载体 91 和调节螺钉 92 组成（如图 5 所示）。如图 6 和图 7 所示，载体 91 的两面分别为平面 911 和台阶面 912 。平面 911 沿台阶面 912 上升的方面向上倾斜，平面 911 具有与锁片 81 相同的横截面形状，并能与锁片 81 贴合。载体 91 的台阶面 912 朝向大力钳的夹头一侧。载体 91 的台阶面 912 高起部分 915 具有通孔 913 ，载体 91 通过位于通孔 913 安装在导杆 6 上。通孔 913 的横截面形状与导杆 6 的横截面形状大致相同，并且通孔孔 913 靠近台阶面 912 的部分呈喇叭状扩大。在进行锁紧的过程中，该喇叭状扩大的部分使载体 91 能相对于导杆 6 向手柄远端进行摆动，从而对锁片 81 施加作用力，使锁片 81 与导杆 6 之间产生摩擦力。。载体 91 台阶面 912 的下台阶部分 916 具有通孔 914 ，调节螺钉 92 安装在通孔 914 中，并且能在沿着通孔发生位移。调节螺钉 92 的头部朝向夹头一侧。
调节机构 9 靠近夹头的一侧安装有滑动机构 10 。进一步地，在本具体实施方式中，滑动机构 10 为滑块 101 。如图 8 和图 9 所示，滑块 101 为 U 形结构， U 形的连接处具有圆角梯形孔 102 ，滑块 101 的圆角梯形孔 102 与锁片 81 上的圆角梯形孔 83 大小相同，滑块 101 通过位于其上的圆角梯形孔 102 穿设在导杆 6 上。滑块 101 的 U 形结构的两臂 103 上，设置有通孔 104 。
如图 1 和图 10 所示，连杆 11 的一个端部 111 通过铆钉安装在第二手柄 4 上，另一个端部 112 通过销钉安装在滑块 101 的两臂 103 之间。本领域技术人员可知，连杆 11 与第二手柄 4 和滑块 101 还可以有其他的连接方式。连杆 11 的端部 112 为多段曲线，端部 112 靠近连杆背部 113 的曲线段的曲率大，远离背部 113 的曲线段的曲率小。连杆 11 的端部 112 被配置为在夹紧工件时，能与调节机构 9 的调节螺钉 92 相接触。在进行夹持的过程中，由于连杆 11 存在曲率小的曲线段，所以允许连杆推动滑块 101 朝向手柄远端运动。当连杆 11 绕第二连接点 16 转动一定角度后，曲率大的曲线段开始接触调节螺钉 92 ，并对调节螺钉 92 施加作用力，调节螺钉 92 将作用力传递给载体 91 ，进一步再传递给锁片 81 ，最终可实现锁紧。因此，连杆 11 的端部 112 上不同曲率的曲线段的设置，允许大力钳在夹持不同大小的工件时，不需要事先调节两个夹头之间大小，通过曲率小的曲线段完成连杆 11 对滑动块 101 的推动，通过曲率大的曲线段完成连杆 11 对调节螺钉 92 的作用，使大力钳开始锁紧，并保证开始锁紧时连杆 11 与第二手柄形成的角度一致，实现了夹头的自调功能。连杆 11 还具有圆弧形的凸起 114 ，位于连杆背部 113 相对的一侧。
如图 1 、 11 、 12 和 13 所示，导杆 6 通过第一支撑片 12 、第二支撑片 13 和第三支撑片 14 安装到第一手柄 3 上。其中，第一支撑片 12 具有 T 形外形， T 形伸出的两端 121 能与第一手柄 3 上设置的凹槽过盈配合，从而安装到第一手柄 3 上。本领域技术人员可知，第一支撑片 12 还可以通过焊接等方式安装到第一手柄 3 上。第一支撑片 12 中间具有孔 122 ，该孔 122 为圆角梯形，能与导杆 6 具有切口 63 的一端过渡配合。第二支撑片 13 和第三支撑片 14 配合使用。第二支撑片 13 具有突出部位 131 ，该突出部位 131 的直径小于第二支撑片 13 本体 132 的直径。第二支撑片 13 中间具有孔 133 ，该孔 133 为圆角梯形，能与导杆 6 没有切口的一端过渡配合。第三支撑片 14 具有 T 形外形， T 形具有两个沿中心线对称的凸起 141 ，所述凸起 141 向第三支撑片 14 的一侧延伸一定距离，第三支撑片 14 的 T 形伸出的两端能与第一手柄 3 上设置的凹槽过盈配合。本领域技术人员可知，第三支撑片 14 还可以通过焊接等方式安装到第一手柄 3 上。第二支撑片 13 和第三支撑片 14 贴合使用，第二支撑片 13 上的突出部位 131 与第三支撑片 14 的两个凸起 141 之间限定的空间相卡合。第三支撑片 14 中间没有开孔，其侧面为导杆 6 提供了一定的支撑作用。
如图 1 和图 14 所示，本具体实施方式的大力钳还具有第三手柄 15 ，第三手柄 15 为圆弧状，通过铆钉可枢转地安装到第二手柄 4 上。本领域的技术人员可知，第三手柄 15 还可以通过其他方式可枢转地安装到第二手柄 4 上。第三手柄 15 的一个端部 151 在一定情况下能与连杆 11 的凸起 114 接触，并对其施加力。第三手柄 15 的另一个端部 152 可随着第三手柄 15 的枢转靠近或远离第二手柄 4 。当端部 152 靠近第二手柄 4 时，端部 151 就远离第二手柄 4 ；当端部 152 远离第二手柄 4 时，端部 151 就靠近第二手柄 4 。
如图 15 所示，当本具体实施方式的大力钳处于打开状态时，由于第一弹簧 5 的回弹力的作用，在第二夹头 2 上第一弹簧 5 与第二夹头 2 的接触点上施加拉力，使第二夹头 2 远离第一夹头 1 ，达到最大开口。当第二夹头 2 打开到最大开口时，第二夹头 2 通过第一连接点 21 对第二手柄 4 施加作用力，使第二手柄 4 绕着第一连接点 21 进行枢转，从而使第一手柄 3 和第二手柄 4 之间的夹角最大。连杆 11 限定了第一手柄 3 和第二手柄 4 之间的最大夹角。
本具体实施方式的大力钳夹持工件时，其状态如图 16 所示。进行夹紧时，使用者可以通过手掌握持第一手柄 3 ，手指拉动第二手柄 4 ，对第二手柄 4 施加朝向第一手柄 3 的力，使第二手柄 4 绕着第一连接点 21 枢转。在第二手柄 4 的作用下，第二夹头 2 绕第四连接点 22 枢转，逐渐靠近第一夹头 1 。当第一夹头 1 与第二夹头 2 贴紧工件后，第一夹头 1 和第二夹头 2 的相对位置不再改变，且两个夹头呈大致平行的状态。第二手柄 4 在使用者施加的力的作用下，继续绕第一连接点 21 朝向第一手柄 3 运动。在此过程中，连杆 11 受到第二连接点 16 处传来的作用力，由于连杆 11 是刚性结构，因此会压迫滑块 101 沿导杆 6 向第一手柄的远端运动，在此过程中，两个夹头的相对位置不会改变。滑块 101 与调节机构 9 、锁紧机构 8 和第二弹簧 7 依次连接，在滑块 101 的作用下，调节机构 9 和锁紧机构 8 也沿着导杆 6 朝向第一手柄的远端运动，锁紧机构 8 压迫第二弹簧 7 压缩。当第二弹簧 7 被压缩到一定程度后，连杆 11 的端部 112 与调节机构 9 上的调节螺钉 92 的头部 921 接触。参见图 1 ，在本具体实施方式的大力钳不夹持工件时，其锁紧状态时第二弹簧 7 的压缩程度小于夹持工件时的压缩程度。夹持的工件越大，第二弹簧 7 被压缩的程度越大。
当连杆 11 的端部 112 与调节螺钉 92 的头部 921 接触后，在第二手柄 4 上施加的力进一步地作用到调节螺钉 92 上，由于调节机构 9 的载体 91 与导杆 6 为间隙配合，且载体 91 的通孔 913 是喇叭状扩大通孔，因此在调节螺钉 92 朝向第一手柄 3 远端的作用力下，载体 91 会相对于导杆 6 发生倾斜。载体 91 的倾斜进一步作用到锁片 81 上，锁片 81 分别相对导杆 6 发生倾斜。当锁片 81 达到一定的倾斜角度后，锁片 81 的圆角梯形孔 83 的边缘与导杆 6 产生了摩擦力，并且第二连接点 16 位于第一连接点 21 和第三连接点 17 连线的靠近第一手柄侧时，产生了大力钳的锁紧，锁紧后，夹头的夹紧力不因为施加在手柄上的力消失而消失。在此过程中，多于 1 片的锁片 81 在一定程度上降低了对锁片冲裁精度的要求，允许锁片 81 之间存在间隙，当锁片 81 与导杆 6 形成一定的倾斜角度后，锁片 81 总会对导杆 6 产生摩擦力从而实现锁紧。此时，连杆 11 上的凸起 114 抵住第三手柄 15 的一个端部 151 ，使之紧贴第二手柄 4 ，而另一个端部 152 则远离第二手柄 4 。锁紧后，大力钳能牢牢的夹紧工件。
当要卸下夹紧的工件时，首先在第三手柄 15 的端部 152 施加朝向第二手柄 4 的力，第三手柄 15 绕枢轴旋转，其端部 151 朝向远离第二手柄 4 的方向运动，并对连杆 11 的凸起 114 产生远离第二手柄 4 的作用力。在该作用力的作用下，连杆 11 绕第二连接点 16 枢转，连杆 11 的端部 112 相对于调节螺钉 92 发生运动，对调节螺钉 92 的作用力逐渐减小。之后，在第一手柄 3 和第二手柄 4 施加朝向相背离方向的力，使得连杆 11 的端部 112 与调节螺钉 92 脱离。在此过程中，调节机构 9 的载体 91 和锁紧机构 8 的锁片恢复原先的倾斜角度，对导杆 6 的摩擦力减小，锁紧被解除。在第二弹簧 7 的回弹力的作用下，锁定机构 8 、调节机构 9 和滑动机构 10 顺着导杆 6 朝向夹头方向运动。之后，在连杆 11 的推力作用以及第一弹簧 5 对第二夹头 2 的拉力作用在第一连接点 21 产生的力的作用下，第二手柄 4 远离第一手柄 3 枢转，直到打开到最大角度，完成了卸下工件的操作。
调节螺钉 92 可以在载体 91 的通孔 914 中发生位移。当调节螺钉 92 朝向夹头方向发生一定位移时，连杆 11 与调节螺钉 92 相对于未调节前更早的发生接触。这意味着，锁片 81 发生倾斜以对导杆 6 产生摩擦力开始锁紧并到最终完成锁紧后，在两个夹头之间形成的夹紧力比未调节之前大。换言之，当调节螺钉 92 朝向夹头方向发生位移时，可以产生更大的夹紧力。与此相反，当调节螺钉 92 向远离夹头的方向发生一定位移时，连杆 11 与调节螺钉 92 相对于未调节前更晚的发生接触。这意味着，锁片 81 发生倾斜以对导杆 6 产生摩擦力开始锁紧时并最终完成锁紧后，在两个夹头之间形成的夹紧力比未调节之前小。换言之，当调节螺钉 92 向远离夹头方向发生位移时，能产生减弱的夹紧力。
经测试，本具体实施方式的大力钳，其两个夹头之间夹持厚度为 25mm 的压力传感器时，在第二手柄尾端施加 15kg 的载荷，两个夹头之间的夹持力为 350kg 。当夹持 20mm 的圆棒时，在第二手柄上施加 12.8kg 的载荷，两个夹头之间的最大扭力为 52N*M 。当夹持对边为 20mm 的六角棒时，在第二手柄上时间 14.5kg 的载荷，两个夹头之间的最大扭力为 103.5N*M 。
以上详细描述了本发明的较佳具体实施例。应当理解，本领域的普通技术人员无需创造性劳动就可以根据本发明的构思作出诸多修改和变化。因此，凡本技术领域中技术人员依本发明的构思在现有技术的基础上通过逻辑分析、推理或者有限的实验可以得到的技术方案，皆应在由权利要求书所确定的保护范围内。

Claims (14)

  1. 一种大力钳，包括第一夹头、第二夹头、第一手柄和第二手柄，所述第一夹头安装到所述第一手柄上，所述第二夹头可枢转地安装到所述第一手柄上，并通过第一连接点可枢转地安装到所述第二手柄上，其特征在于，所述大力钳还包括：单个连杆和滑动机构，所述连杆的一端通过第二连接点可枢转地安装到第二手柄上，另一端通过第三连接点可枢转地安装到所述滑动机构上，所述滑动机构可滑动地安装在所述第一手柄上；用于锁紧所述大力钳的锁紧机构；以及用于调节所述大力钳夹紧力的调节机构。
  2. 根据权利要求1所述的大力钳，其特征在于，所述连杆与所述滑动机构连接的一端由曲线段构成，且靠近第一手柄的曲线段曲率比远离第一手柄的曲线段曲率大。
  3. 根据权利要求1所述的大力钳，其特征在于，所述连杆由中碳高强度碳素结构钢或高碳钢制成。
  4. 根据权利要求1所述的大力钳，其特征在于，所述连杆在所述第二连接点上通过铆钉安装到所述第二手柄上，在所述第三连接点上通过销钉安装到所述滑动机构上。
  5. 根据权利要求1所述的大力钳，其特征在于，所述锁紧机构可滑动地安装到所述第二手柄上，并位于所述滑动机构靠近所述第一手柄远端侧。
  6. 根据权利要求5所述的大力钳，其特征在于，所述锁紧机构包括导杆和锁片，所述导杆穿设在所述锁片上，所述导杆安装在所述第一手柄上。
  7. 根据权利要求6所述的大力钳，其特征在于，所述锁片为多片，所述多片锁片互相贴合。
  8. 根据权利要求6所述的大力钳，其特征在于，所述导杆的横截面为圆角梯形，所述锁片的中间具有供所述导杆穿过孔，所述孔被设置为具有与所述导杆的横截面形状相同的圆角梯形，所述导杆与所述锁片为间隙配合。
  9. 根据权利要求1所述的大力钳，其特征在于，所述调节机构安装在所述导杆上，位于所述滑动机构和所述锁紧机构之间，所述调节机构被配置为在所述导杆的长度方向上能够发生位移。
  10. 根据权利要求9所述的大力钳，其特征在于，所述调节机构被配置为，当所述调节机构朝向所述导杆的任一端达到最大位移，在所述大力钳进行锁紧时，所述连杆与所述滑动机构相连的一端都能与所述调节机构接触。
  11. 根据权利要求9所述的大力钳，其特征在于，所述调节机构包括调节螺钉和载体，所述载体安装在所述导杆上，所述调节螺钉安装在所述载体上，并能相对于所述载体发生沿所述导杆方向的位移。
  12. 根据权利要求9所述的大力钳，其特征在于，所述载体的横截面与所述锁片的横截面相同，并在与所述锁片相同的位置具有与所述锁片形状大小相同的孔，所述导杆穿过所述载体上的孔。
  13. 根据权利要求1所述的大力钳，其特征在于，还包括第三手柄，所述第三手柄可枢转地安装在所述第二手柄上，并被配置为：当所述第三手柄远离枢转点的一端靠近所述第二手柄时，所述第三手柄靠近所述枢转点的一端能作用于所述连杆。
  14. 根据权利要求13所述的大力钳，其特征在于，所述连杆与所述第三手柄相作用的部位具有圆弧型凸起。
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