CN113754250B

CN113754250B - Single-drip pliers

Info

Publication number: CN113754250B
Application number: CN202111124976.6A
Authority: CN
Inventors: 王忠尉; 王鑫冬; 王得意; 王晟滔; 王忠意
Original assignee: Zhejiang Hengyan General Equipment Co ltd
Current assignee: Zhejiang Hengyan General Equipment Co ltd
Priority date: 2021-09-25
Filing date: 2021-09-25
Publication date: 2022-12-13
Anticipated expiration: 2041-09-25
Also published as: CN113754250A

Abstract

The application relates to a pair of single-drip-opening pliers, comprising two pliers arms, wherein one end of each pliers arm is provided with a connecting mechanism, the other end side wall of each pliers arm is provided with a mounting hole, the mounting hole penetrates through the adjacent pliers arm side wall, the side wall of the mounting hole is provided with a mounting groove, the pliers arm at one end of the mounting groove is provided with a first stop dog, the pliers arm at the other end of the mounting groove slides and is provided with a second stop dog, and a reset mechanism is arranged between the second stop dog and the pliers arm. This application has and produces the impact when the template to the second stopper, and the gliding motion is done to the second stopper, make the second stopper appear when the displacement difficult and the template between the card die, make the template can promote to the answer normal position by the second stopper after inertia displacement takes place, make the amalgamation precision after the mutual amalgamation once more between two templates higher, make protruding edges and strips of difficult appearance in off-the-shelf glass bottle lateral wall department, improved the effect of the quality of off-the-shelf long-neck glass bottle.

Description

Single-drip pliers

Technical Field

The application relates to the field of mold clamps, in particular to a pair of single-dropping-mouth pliers.

Background

Glass flasks are common glass bottles in our daily lives and are commonly used for holding carbohydrates and wine.

Common equipment that is used for producing the glass bottle of longneck among the modern factory is called ranks machine, install a plurality of blow mold that are array form and distribute on the ranks machine, blow mold includes body mould and bottleneck mould, and the bottleneck mould passes through single-drip pincers to be installed on ranks machine, when the blowing, body mould and bottleneck mould amalgamation mutually, after the blowing is accomplished, body mould separation, single-drip pincers rotate and drive on the conveyer belt of longneck bottle upset to ranks machine one side, place the longneck bottle on the conveyer belt after, single-drip pincers are opened, and then drive the bottleneck mould and open, then single-drip pincers reply the normal position and drive the bottleneck mould and reset, the conveyer belt starts to transport the longneck bottle, accomplish a blowing.

Referring to fig. 1, a single-drip-opening pliers in the related art includes two pliers arms 1, one end of each pliers arm 1 is connected to a line arranging machine, the other end of each pliers arm 1 is provided with an arc groove 7 matched with a template of a bottle opening mold, the template of the bottle opening mold is hereinafter referred to as a template, two ends of an inner wall of each arc groove 7 are respectively provided with a first stop block 4 and a second stop block 5, the first stop block 4 is fixedly connected with each pliers arm 1, the second stop block 5 is rotatably connected with each pliers arm 1, a rotation axis of the second stop block 5 is parallel to an axis of the arc groove 7, a return spring 65 is further arranged between the second stop block 5 and each pliers arm 1, each pliers arm 1 is provided with a limiting rod, when the bottle opening mold is installed, the second stop block 5 is first rotated to enable the second stop block 5 to release the limitation on the arc groove 7, the templates are then installed in the arc groove 7 in a matched manner, the second stop block 5 is loosened, and the bottle opening rotates to the original position under the action of the return spring 65 to abut against the mold to limit the mold.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: in the practical application process, because the speed when ranks machine drives the drip irrigation tongs motion is very fast, under inertial effect, the template is great to the impact force of second stopper, and then make the drip irrigation tongs at the during operation, the second stopper probably takes place to rotate under the impact of template, second stopper after taking place to rotate probably takes place to block with between the template, lead to the amalgamation face between two templates to appear the dislocation phenomenon, when making the tong arm drive two templates amalgamation, the gap can appear in the amalgamation face between two templates, the quality of the long neck bottle after final shaping has been reduced.

Disclosure of Invention

In order to solve the second stopper and take place to rotate the back easily and take place the card dead problem between the bottleneck mould receiving the impact of template, this application provides a single drop mouth pincers.

The application provides a single-drip pliers adopts following technical scheme:

the utility model provides a single-drip pliers, includes two tong arms, the one end of tong arm is provided with the coupling mechanism who is used for being connected with ranks machine, the other end lateral wall of tong arm runs through and has seted up the mounting hole, the mounting hole with adjacent one the lateral wall of tong arm runs through, the mounting hole with the central angle of one side of tong arm contact is less than 180 degrees, the mounting groove that is used for cooperating the installation template is seted up to the lateral wall of mounting hole, the one end department of mounting groove be provided with first dog on the tong arm, slide on the tong arm of the other end department of mounting groove and install be used for with first dog cooperation carries out spacing second dog to the template, the second dog with be provided with between the tong arm and be used for reseing the canceling release mechanical system of second dog.

Through adopting above-mentioned technical scheme, pass through coupling mechanism with two tong arms and install the back on ranks machine, establish template cooperation card in the mounting groove again, carry on spacingly through first dog and second dog to the template, because the second dog slides and installs on the tong arm, when the template produces the impact to the second dog under inertial effect, the second dog is the gliding movement, make the second dog appear difficult and take place the card between the displacement and die, and then make the template can be promoted to the answer normal position by the second dog after inertia displacement takes place, make the amalgamation precision after the mutual amalgamation once more between two templates higher, make protruding edges and corners are difficult for appearing in off-the-shelf glass bottle lateral wall department, the quality of off-the-shelf long neck glass bottle has been improved.

Optionally, the reset mechanism includes a pull rod slidably mounted on the caliper arm, the pull rod is in running fit with the caliper arm, the pull rod slides along the length direction of the pull rod, the sliding direction of the pull rod is parallel to the sliding direction of the second stop block, one end of the pull rod is connected with the second stop block, and an elastic element is arranged between the pull rod and the caliper arm and used for resetting the pull rod.

Through adopting above-mentioned technical scheme, the second dog passes through the pull rod and comparatively steadily slides and installs on the tong arm, and makes second dog and tong arm separation back when staff pulling second dog and pull rod, and the rotatable second dog of staff and pull rod are difficult for being disturbed by the second dog during the installation template, and the installation of template is comparatively convenient.

Optionally, be located second stopper department the tong arm lateral wall has seted up the countersunk circular hole, the hole bottom of countersunk circular hole will the second stopper runs through, the pull rod is slided and is installed in the less one end of countersunk circular hole cross-sectional area, the one end of pull rod is passed the less one end of countersunk circular hole cross-sectional area with the second stopper is connected, the second stopper passes through the pull rod slides and installs on the tong arm, the other end of pull rod passes the great one end of countersunk circular hole cross-sectional area is located the external world, the pull rod passes demountable installation has the stopper on the great one end of countersunk circular hole cross-sectional area, the elastic component is established including the cover reset spring on the pull rod, reset spring's one end is supported tightly the ladder face of countersunk circular hole, reset spring's the other end is supported tightly the stopper, the stopper with the cooperation of sliding of the great one end of cross-sectional area of countersunk circular hole.

Through adopting above-mentioned technical scheme, the pull rod slides through the countersunk head round hole and rotates and install on the tong arm for it is more convenient that the staff is when pull rod and second dog are dismantled to needs, and resets to the pull rod through the cooperation between the ladder face of reset spring, stopper and countersunk head round hole, and reset spring is spacing by the one end of the great diameter of pull rod and countersunk head round hole, makes reset spring be difficult for appearing the distortion phenomenon when compressed, and then makes reset spring's the effect comparatively stable.

Optionally, a stop ring is arranged on the side wall of one end of the limiting block, which deviates from the pull rod.

Through adopting above-mentioned technical scheme, keep off the ring and be used for spacing the stopper for the staff is difficult for the transition extension to lead to the spring plastic deformation to appear when pulling second stopper and slide.

Optionally, the pull rod with the coaxial rotation of the one end that the stopper is connected installs and is cylindric connecting block, the connecting hole has been seted up to a terminal surface of stopper, the one end of pull rod reaches the connecting block all cooperates to slide and installs in the connecting hole, the connecting block with the stopper can be dismantled and connect, the pull rod is located the one end lateral wall in the connecting hole runs through and has seted up the sliding hole, cooperate to slide in the sliding hole and install two fixed blocks, two be provided with supporting spring between the fixed block, supporting spring's both ends respectively with two the fixed block is connected, the lateral wall circumference interval of connecting hole run through set up two with fixed block matched with draw-in groove, work as the draw-in groove with when the sliding hole corresponds, supporting spring promotes the one end of fixed block is passed the draw-in groove just is used for right the stopper carries on spacingly.

Through adopting above-mentioned technical scheme, mutually support between first dog and the second dog and carry out spacingly back in the mounting groove with the template, it makes the fixed block lean out from the draw-in groove and carries on spacingly to stopper and pull rod to rotate the stopper, and then make the displacement of second dog when being strikeed by the template less, make the displacement of second dog less, and then make the impact between second dog and the tong arm less, make second dog and tong arm be difficult for appearing the damage because of too big impact force, make the junction of second dog and pull rod difficult for appearing deformation damage because of too big impact force simultaneously.

Optionally, the cross section of the sliding hole is polygonal, the side wall of the fixed block is stepped, and when one end of the fixed block passes through the slot, the supporting spring pushes the stepped surface of the fixed block to abut against the side wall of the connecting hole, one clockwise or counterclockwise side wall of each fixed block is arc-shaped, and the axis of the arc-shaped side wall of each fixed block is parallel to the axis of the pull rod.

Through adopting above-mentioned technical scheme, when dismantling the template, rotate the stopper and can promote the fixed block through the arc lateral wall of fixed block comparatively smoothly and contract to the downthehole that slides, and because the transversal polygon of personally submitting of hole that slides for the fixed block is difficult for appearing rotating, and then makes the stopper promote when the fixed block shrink difficult and appear the card phenomenon of dying between the fixed block.

Optionally, the clamp arm is provided with a positioning groove, and the second stopper is slidably mounted in the positioning groove.

Through adopting above-mentioned technical scheme, the constant head tank is used for fixing a position the second dog for the second dog is when being strikeed by the template and produce the slip, and the second dog is difficult for appearing rotating, and then makes the second dog comparatively stable to the limit function of template, and pull rod and second dog are difficult for appearing rotating when rotating the stopper, make the rotation of stopper comparatively convenient.

Optionally, a first fixing hole is formed in the outer side wall of the baffle ring, the baffle ring and the limiting block are sequentially penetrated through by the first fixing hole, a second fixing hole is formed in the side wall of the connecting block in a penetrating mode, the diameter of the second fixing hole is not smaller than that of the first fixing hole, a positioning pin is arranged on the limiting block, and one end of the positioning pin sequentially penetrates through the first fixing hole and the second fixing hole.

Through adopting above-mentioned technical scheme, fix through the locating pin between connecting block and the stopper, compare in both adopt the bolt to fix, because the locating pin is not fragile, life is longer, and the locating pin is comparatively convenient when dismantling, and then make the dismantlement of stopper comparatively convenient, simultaneously because first fixed orifices is seted up on keeping off the ring, make the contact length between locating pin and the fibre piece and the fender ring longer, the contact length of locating pin and connecting block is shorter, and then make the locating pin be difficult for appearing deformation more.

Optionally, an arc-shaped spring leaf is arranged in the mounting groove, arc-shaped plates are arranged at two ends of the spring leaf, the axis of each arc-shaped plate is parallel to the axis of the spring leaf, the bending direction of each arc-shaped plate is opposite to that of the spring leaf, two fixing screw rods are installed on the clamp arm in a threaded mode, and one end of each fixing screw rod penetrates through the side wall of the mounting groove and is located in the corresponding arc-shaped plate.

Through adopting above-mentioned technical scheme, the spring leaf is arranged in supporting tightly the location to installing the template in the mounting groove, has improved the stability of template installation in the mounting groove.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the template impacts the second stopper under the action of inertia, the second stopper slides to ensure that the second stopper is not easily clamped with the template when the second stopper is displaced, and the template is pushed to a return position by the second stopper after the inertial displacement occurs, so that the splicing precision of two templates after being spliced with each other is high, convex ribs are not easily formed on the side wall of a finished glass bottle, and the quality of the finished long-neck glass bottle is improved;

2. the second stopper is relatively stably installed on the clamp arm in a sliding mode through the pull rod, and workers can rotate the second stopper and the pull rod to enable the second stopper not to be easily interfered by the second stopper when installing the template, so that the template is relatively convenient to install;

3. the spring leaf is used for supporting tightly the location to installing the template in the mounting groove, has improved the stability of template installation in the mounting groove.

Drawings

Fig. 1 is a perspective view of a related art of the present application, in which a caliper arm is cut.

Fig. 2 is a perspective view of the present application, in which the clamp arm is cut.

Fig. 3 is a schematic perspective view of another embodiment of the present application.

Fig. 4 is an enlarged schematic view of a portion a in fig. 2.

Fig. 5 is a schematic cross-sectional view at the tie rod of the present application.

Reference numerals: 1. a clamp arm; 11. mounting holes; 12. mounting grooves; 13. a threaded hole; 14. countersunk circular holes; 15. positioning a groove; 2. a connecting mechanism; 21. a connecting plate; 22. connecting grooves; 3. a spring plate; 31. an arc-shaped plate; 32. fixing the screw rod; 4. a first stopper; 5. a second stopper; 6. a reset mechanism; 61. a pull rod; 611. a sliding hole; 612. a fixed block; 613. a support spring; 62. connecting blocks; 621. a second fixing hole; 63. a limiting block; 631. connecting holes; 632. a baffle ring; 633. a first fixing hole; 634. a card slot; 64. positioning pins; 65. a return spring; 7. a circular arc groove.

Detailed Description

The present application is described in further detail below with reference to figures 2-5.

The embodiment of the application discloses single-drip-opening pliers, refer to fig. 2, including two clamp arms 1 that are rectangular platelike, the one end of clamp arm 1 is provided with coupling mechanism 2, and coupling mechanism 2 includes connecting plate 21, and the integrative setting of connecting plate 21 is served at one of clamp arm 1 and the face of connecting plate 21 is perpendicular with the length direction of clamp arm 1. The connecting plate 21 is provided with a connecting groove 22 matched with the ranks machine on the end surface deviating from the clamp arm 1, and the two opposite end surfaces of the connecting plate 21 are penetrated by the two ends of the connecting groove 22 in the length direction.

Referring to fig. 2, a mounting hole 11 is formed through a plate surface of one end of each of the jawarms 1 away from the connecting plate 21, and the mounting hole 11 penetrates through a side wall of an adjacent jawarms 1. The lateral wall of mounting hole 11 is coaxial to be seted up with template matched with mounting groove 12, is provided with in the mounting groove 12 and is curved spring leaf 3, and the equal an organic whole in both ends of spring leaf 3 is provided with arc 31, and the axis of arc 31 is parallel with the axis of spring leaf 3 and the crooked direction of arc 31 is opposite with the crooked direction of spring leaf 3.

Referring to fig. 2, a fixing screw 32 is coaxially disposed in each of the two arc plates 31, threaded holes 13 matched with the fixing screws 32 are formed in two opposite side walls of the mounting groove 12, and the clamp arm 1 is penetrated through the threaded holes 13. Two ends of the fixing screw 32 are respectively installed in the threaded holes 13 in a threaded manner, and the side wall of one end of the fixing screw 32 located in the arc-shaped plate 31 is smooth, and the clamp arm 1 positions the arc-shaped plate 31 and the spring piece 3 through the fixing screw 32.

Referring to fig. 2, a first stop block 4 and a second stop block 5 are arranged on the side wall of the jawarm 1 penetrated by the mounting hole 11, the first stop block 4 is located at one end of the mounting groove 12 departing from the connecting plate 21 and is embedded in the mounting groove 12 in a matching manner, the first stop block 4 is fixedly connected with the jawarm 1 through a bolt, and one end of the first stop block 4 extends towards the axis direction of the mounting groove 12. The second stop block 5 is located at one end of the mounting groove 12 close to the mounting plate, a countersunk circular hole 14 is formed in the side wall of the clamp arm 1 at the second stop block 5 in a penetrating manner, and the end with the smaller cross-sectional area of the countersunk circular hole 14 faces the second stop block 5.

Referring to fig. 2, the axis of the circular countersunk hole 14 is tangent to the virtual circle where the mounting hole 11 is located, and the axis of the circular countersunk hole 14 is perpendicular to the side wall of the jawarm 1 through which the mounting hole 11 passes. The lateral wall of the clamp arm 1 at the end of the countersunk circular hole 14 with the smaller cross-sectional area is provided with a positioning groove 15, the second stop block 5 is slidably mounted in the positioning groove 15, and the sliding direction of the second stop block 5 is parallel to the axis of the countersunk circular hole 14.

Referring to fig. 2 and 3, the two ends of the positioning groove 15 penetrate through the jawarms 1, and the two ends of the second stop block 5 extend out of the positioning groove 15, so that the operator can pull the second stop block 5 conveniently. The positioning slot 15 in another embodiment is only communicated with the mounting groove 12 to increase the strength of the jawarm 1.

Referring to fig. 2 and 4, the caliper arm 1 is provided with a resetting mechanism 6, the resetting mechanism 6 includes a pull rod 61 slidably mounted in one end of the countersunk circular hole 14 with a smaller cross-sectional area, and one end of the pull rod 61 penetrates through the countersunk circular hole 14 and is fixedly connected with the second stopper 5. The other end of the pull rod 61 penetrates out of the end with the larger cross-sectional area of the countersunk circular hole 14, the connecting block 62 is coaxially and rotatably mounted on the end face of the end, located outside, of the pull rod 61, and the outer side wall of the connecting block 62 is flush with the outer side wall of the pull rod 61. A sliding hole 611 with a rectangular cross section is formed in the side wall of one end of the pull rod 61 located outside in a penetrating manner, a rectangular fixing block 612 is installed in the sliding hole 611 in a matching sliding manner, and the two fixing blocks 612 are connected through a supporting spring 613.

Referring to fig. 4 and 5, the side walls of the two fixing blocks 612 at opposite ends are both trapezoidal, and the side walls of the two fixing blocks 612 at the same side, which rotate clockwise, at the end with a smaller cross-sectional area are both arc-shaped with the axis of the pull rod 61 as the axis. The pull rod 61 is provided with and is columniform stopper 63, and stopper 63 slides the cooperation with the great one end of directly falling of countersunk circular hole 14, and stopper 63 coaxial runs through and has seted up and be columniform connecting hole 631, and pull rod 61 sets up the one end and the connecting block 62 of the hole 611 that slides and all cooperate to slide and penetrate in the connecting hole 631 and with the lateral wall normal running fit of connecting hole 631, and the one end of carrying on the back of the body of two fixed blocks 612 all supports tight connecting hole 631 lateral wall.

Referring to fig. 2 and 4, a stop ring 632 is coaxially and integrally arranged at one end of the limit block 63 departing from the pull rod 61, and an end surface of the stop ring 632 departing from the pull rod 61 is flush with an end surface of the limit block 63 departing from the pull rod 61. Keep off ring 632 lateral wall and seted up first fixed orifices 633, first fixed orifices 633 run through fender ring 632 and stopper 63 with in proper order. A second fixing hole 621 having the same cross section as the first fixing hole 633 is formed through the side wall of the connecting block 62. When the connecting block 62 slides to an end face of the connecting block 62 and the end face of the limiting block 63 are flush, the second fixing hole 621 is coaxial with the first fixing hole 633, the positioning pin 64 is arranged in the first fixing hole 633 in a penetrating mode, one end of the positioning pin 64 penetrates through the first fixing hole 633 and the second fixing hole 621 in sequence to fix the connecting block 62 and the limiting block 63, and two ends of the positioning pin 64 are fixed between the blocking ring 632 through nuts respectively.

Referring to fig. 2 and 4, the reset mechanism 6 further includes an elastic member, the elastic member includes a reset spring 65 sleeved on the pull rod 61, two ends of the reset spring 65 respectively abut against a step surface in the countersunk circular hole 14 and an end surface of the limiting block 63 facing the clamp arm 1, and the second stopper 5 and the pull rod 61 are reset through cooperation between the reset spring 65 and the limiting block 63.

Referring to fig. 2 and 4, two locking grooves 634 are circumferentially formed through the side wall of the connecting hole 631, the locking grooves 634 are matched with the end of the fixing block 612 with a smaller cross-sectional area, and the locking grooves 634 pass through the end surface of the limiting block 63 facing the clamp arm 1. When the locking groove 634 corresponds to the sliding hole 611, the supporting spring 613 pushes the fixing block 612 to slide until the end of the fixing block 612 with a smaller cross-sectional area passes through the locking groove 634 and is located outside the range of the countersunk circular hole 14, and the stepped surface of the fixing block 612 abuts against the side wall of the connecting hole 631. The second stop block 5 is supported by the two fixing blocks 612, so that the second stop block 5 is not easy to slide during working of the clamp arm 1, and the limitation of the plate body of the bottle mouth mold is stable. Meanwhile, by rotating the limiting block 63 counterclockwise, the limiting block 63 pushes the fixing block 612 to slide towards the sliding hole 611 through the arc surface of the fixing block 612, and the fixing block 612 can be retracted conveniently.

The implementation principle of the single-dropping-mouth pliers of the embodiment of the application is as follows: after the second baffle is pulled to separate the second baffle from the positioning groove 15, the second baffle is rotated to enable the second baffle to leave the range of the mounting groove 12, the template of the semicircular bottleneck mold is embedded in the mounting groove 12, then the second baffle is rotated to enable the second baffle to slide and be mounted in the positioning groove 15, the template is tightly abutted under the action of the reset spring 65, and finally the limiting block 63 is rotated to the fixing block 612 to stretch out of the clamping groove 634, so that the mounting of the template is completed.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a single drip irrigation pliers, includes two tong arms (1), the one end of tong arm (1) is provided with coupling mechanism (2) that are used for being connected with ranks machine, the other end lateral wall of tong arm (1) runs through and has seted up mounting hole (11), mounting hole (11) will be adjacent one the lateral wall of tong arm (1) runs through, mounting hole (11) with the central angle of one side of tong arm (1) contact is less than 180 degrees, mounting groove (12) that are used for the installation template are seted up to the lateral wall of mounting hole (11), the one end department of mounting groove (12) be provided with first dog (4), its characterized in that on tong arm (1): a second stop block (5) which is used for being matched with the first stop block (4) to limit the template is slidably mounted on the clamp arm (1) at the other end of the mounting groove (12), and a reset mechanism (6) for resetting the second stop block (5) is arranged between the second stop block (5) and the clamp arm (1); resetting means (6) are including sliding the installation pull rod (61) on tong arm (1), pull rod (61) with tong arm (1) normal running fit, pull rod (61) slide along its length direction just the slip direction of pull rod (61) with the slip direction of second stopper (5) is parallel, the one end of pull rod (61) with second stopper (5) are connected, pull rod (61) with be provided with the elastic component between tong arm (1), the elastic component is used for resetting pull rod (61).

2. A single-drip pliers according to claim 1 wherein: be located second dog (5) department tong arm (1) lateral wall has seted up countersunk circular hole (14), the hole bottom of countersunk circular hole (14) will second dog (5) run through, pull rod (61) are slided and are installed in the less one end of countersunk circular hole (14) cross-sectional area, the one end of pull rod (61) is passed the less one end of countersunk circular hole (14) cross-sectional area with second dog (5) are connected, second dog (5) are passed through pull rod (61) are slided and are installed on tong arm (1), the other end of pull rod (61) is passed the more one end of countersunk circular hole (14) cross-sectional area is located the external world, pull rod (61) are passed demountable installation has stopper (63) on the more one end of countersunk circular hole (14) cross-sectional area, the elastic component is established including the cover reset spring (65) on pull rod (61), the one end of reset spring (65) is supported tightly the ladder face of countersunk circular hole (14), the other end of reset spring (65) tight stopper (63), stopper (63) with the more cross-sectional area cooperation of countersunk circular hole (14) slide.

3. A single-drip pliers as claimed in claim 2 wherein: the side wall of one end of the limiting block (63) departing from the pull rod (61) is provided with a baffle ring (632).

4. A single-drop-jaw pliers according to claim 3 wherein: pull rod (61) with the coaxial rotation of one end that stopper (63) are connected installs and is cylindric connecting block (62), connecting hole (631) have been seted up to a terminal surface of stopper (63), the one end of pull rod (61) reaches connecting block (62) all cooperate to slide and install in connecting hole (631), connecting block (62) with stopper (63) can be dismantled and be connected, pull rod (61) are located one end lateral wall in connecting hole (631) runs through and has seted up slide hole (611), cooperate to slide in slide hole (611) and install two fixed blocks (612), two be provided with supporting spring (613) between fixed block (612), the both ends of supporting spring (613) respectively with two fixed block (612) are connected, the lateral wall circumference interval of connecting hole (631) run through set up two with fixed block (612) matched with draw-in groove (634), work as draw-in groove (634) with slide hole (611) correspond when, supporting spring (613) promote the one end of draw-in block (612) passes draw-in groove (634) and is used for right stopper (63) carry out spacing.

5. A single-drop-jaw pliers according to claim 4 wherein: the cross section of the sliding hole (611) is polygonal, the side wall of the fixed block (612) is stepped, when one end of the fixed block (612) penetrates through the clamping groove (634), the supporting spring (613) pushes the stepped surface of the fixed block (612) to abut against the side wall of the connecting hole (631), one clockwise or anticlockwise side wall of all the fixed blocks (612) is arc-shaped, and the axis of the arc-shaped side wall of the fixed block (612) is parallel to the axis of the pull rod (61).

6. A single-drop-jaw pliers according to claim 1 wherein: the clamp arm (1) is provided with a positioning groove (15), and the second stop block (5) is slidably mounted in the positioning groove (15).

7. A single-drop-jaw pliers according to claim 4 wherein: keep off ring (632) lateral wall and seted up first fixed orifices (633), first fixed orifices (633) will in proper order keep off ring (632) with stopper (63) run through, connecting block (62) lateral wall runs through and has seted up second fixed orifices (621), the diameter of second fixed orifices (621) is not less than the diameter of first fixed orifices (633), be provided with locating pin (64) on stopper (63), first fixed orifices (633) and second fixed orifices (621) are passed in proper order to the one end of locating pin (64).

8. A single-drop-jaw pliers according to claim 1 wherein: be provided with in mounting groove (12) and be curved spring leaf (3), the both ends of spring leaf (3) all are provided with arc (31), the axis of arc (31) with the axis of spring leaf (3) is parallel just the crooked direction of arc (31) with the crooked direction of spring leaf (3) is relative, two clamping screw (32) are installed to tong arm (1) screw thread, the one end of clamping screw (32) is passed the lateral wall of mounting groove (12) is located in arc (31).