Large-jaw clamp structure

Abstract

The utility model provides a large-jaw clamp structure which is a clamp and comprises a first grab handle, a shaft rod, a limiting clamp piece, a movable clamp piece, an elastic piece, a second grab handle, an unlocking piece, a connecting rod piece and a screw rod. A shaft penetrating hole is formed in the side wall of the supporting head of the first grab handle; the shaft rod penetrates through the shaft penetrating hole; the assembly part of the limiting clamp piece is attached to and assembled on the shaft rod outside the side wall, and a limiting clamp arm extends and is provided with a first chuck; a movable plier head part of the movable plier piece is arranged on the other side of the side wall, one end of the movable plier head part extends to form a movable plier arm which is provided with a second chuck, and the other end of the movable plier head part is provided with a pivoting part pivoted with the supporting head part and a first pivoting head pivoted with the second grab handle; according to the overall structure, the size of the jaw of the clamp is adjusted within the length range of the shaft rod, and the clamping and locking capacity range of the clamp on a target workpiece can be remarkably widened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a large tongs mouth tongs structure that can significantly improve the clamping target workpiece capacity range. BACKGROUND

[0002] The conventional clamp, as stated in the prior art content of the patent case with the Taiwan certificate number TWM449066, has a fixed tongs handle 11, a movable tongs handle 12 that swings relative to the fixed tongs handle 11 to an open state and a closed state, an elbow lever locking element 13 that is pivoted to the movable tongs handle 12 and extends to the fixed tongs handle 11 and ends at a free end portion 131, and an adjusting screw 14 that is rotatably screwed to the fixed tongs handle 11 corresponding to the elbow lever locking element 13.

[0003] The fixed tongs handle 11 has a first handle 111 and a fixed tongs mouth portion 112 connected to one end of the first handle 111. The movable tongs handle 12 has a second handle 121 that opens and closes relative to the first handle 111, and a movable tongs mouth portion 122 that opens and closes relative to the fixed tongs mouth portion 112 and is respectively pivoted between one end of the second handle 121 and the fixed tongs handle 11.

[0004] The adjusting screw 14 has a screw rod 141 for the free end portion 131 of the elbow lever locking element 13 to abut against and be rotatably screwed to the first handle 111, and a cylindrical adjusting knob 142 that is connected to the screw rod 141 in the opposite direction of the elbow lever locking element 13 and exposed at one end of the first handle 111.

[0005] In use, the fixed tongs handle 11 and the movable tongs handle 12 can be first opened to place a workpiece 15 to be clamped between the fixed tongs mouth portion 112 and the movable tongs mouth portion 122, and then force can be applied to the first and second handles 111, 121 to enable the workpiece 15 to be stably clamped. Then, by further rotating the adjusting knob 142 of the adjusting screw 14, the degree of tightness of the fixed tongs mouth portion 112 and the movable tongs mouth portion 122 on the workpiece 15 can be increased, so that the workpiece 15 is still stably locked and clamped without the first and second handles 111, 121 being continuously applied with force, and the force exerted by the fixed tongs mouth portion 112 and the movable tongs mouth portion 122 on the workpiece 15 that has been clamped and locked can be adjusted.

[0006] The conventional clamp can clamp the workpiece 15 by the force applied by the first and second handles 111, 121, but the clamping ability of the clamp is limited to the workpiece within the range of the swing angle between the fixed jaw portion 112 and the movable jaw portion 122, and the clamp cannot be expanded to clamp a larger workpiece. Even the patent (TWM449066) or other existing clamps, such as the utility model patent (TWI411498), have the same jaw design, and the clamping mechanism or condition of the movable jaw portion is limited to a certain range, and the clamping ability cannot be expanded by expanding the jaw. Utility model content

[0007] The main purpose of the present utility model is to provide a large jaw clamp structure to solve the above technical problems in the prior art.

[0008] The present utility model provides a large jaw clamp structure, which is a clamp, characterized by comprising:

[0009] A first handle is formed at one end of a C-shaped holding portion in a cross section, and has a support head portion and a threaded hole at the other end. The inner side of the support head portion has a side wall, and a shaft hole is formed in the side wall.

[0010] A shaft rod is a long rod body with a cross section corresponding to the shape of the shaft hole. The shaft rod passes through the shaft hole and is installed on the support head portion. The axis of the long rod body is defined as a working center line of the clamp.

[0011] A limiting jaw is located outside one side of the side wall of the support head portion. The limiting jaw is installed on the shaft rod and has a surface abutting the shaft rod and an assembly portion installed on the shaft rod. The assembly portion is located at one end of the limiting jaw away from the shaft rod and extends a limiting jaw arm. The limiting jaw arm is an n-shaped arm body, and a first chuck is provided at the end of the limiting jaw arm.

[0012] A movable jaw is located on the other side of the side wall of the support head portion and corresponds to the assembly portion of the limiting jaw. The movable jaw has a movable jaw head portion which is the same as the assembly portion and abuts the same surface of the shaft rod. The movable jaw head portion is located at one end of the movable jaw away from the shaft rod and extends a movable jaw arm. A pivot portion and a first pivot portion away from the support head portion are respectively provided at the edge corner below the working center line. The movable jaw arm corresponds to the limiting jaw arm and is an n-shaped arm body. A second chuck is provided at the end of the movable jaw arm. A pulling portion is provided between the pivot portion and the first pivot portion of the movable jaw head portion.

[0013] An elastic member is fixed at one end on the holding part and at the other end on the pull part, for pulling the movable clamp part back to the original position after swinging;

[0014] A second handle is pivoted at one end on the first pivot part through a first shaft pin and at the other end away from the tail part through a second shaft pin, and a third shaft pin is arranged between the first shaft pin and the second shaft pin;

[0015] An unlocking member is pivoted at the middle part on the second shaft pin, and one end of the pivoted part is provided with a push part, and the other end is provided with an unlocking operation part;

[0016] An arc convex part is arranged opposite the push part, one end of the arc convex part is pivoted on the third shaft pin, and the other end extends to the holding part and is provided with a stop part;

[0017] A screw rod is screwed into the screw hole, one end of the screw rod abuts against the stop part on the holding part, and the other end of the screw rod extends out of the screw hole and is provided with a rotating operation head.

[0018] The utility model provides a large jaw clamp structure, wherein the through shaft hole of the support head of the first handle is a flat long hole, and the shaft rod is a long rod body of a flat iron which can freely slide in and out of the through shaft hole; the surface of the shaft rod and the movable clamp head of the movable clamp part is abutted, so that the swing movement of the movable clamp part is limited or guided by the shaft rod when the movable clamp head swings, and shaking or deviation is reduced.

[0019] The utility model further provides a large jaw clamp structure, wherein the support head of the first handle is provided with at least one blocking column close to the shaft rod above and below the working center line; the at least one blocking column assists the support of the through shaft hole on the shaft rod, which not only increases the anti-hole deformation strength of the through shaft hole, but also reduces the excessive inclination of the horizontality of the two ends of the shaft rod when the shaft rod is inserted into the through shaft hole.

[0020] The utility model further provides a large jaw clamp structure, wherein the assembly part of the limiting clamp part is fixed on the shaft rod outside the side wall of the support head on the side of the movable clamp part; the assembly part of the limiting clamp part is fixed on the shaft rod, so that the relationship between the first clamp head and the shaft rod is fixed, the clamp can be displaced left and right on the through shaft hole of the support head of the shaft rod, and the size of the jaw of the clamp is adjusted.

[0021] The utility model discloses further provide a big mouthed tongs structure, wherein, the assembly department of the limited tong piece is attached to one side of the shaft, the assembly department is formed with a cross body, the cross body is provided with a sleeve hole corresponding to the cross section shape of the shaft, and the shaft is arranged in the sleeve hole, and the assembly department is arranged on the shaft, when the first chuck of the limited tong piece is blocked, the assembly department is slightly inclined by an angle, the sleeve hole can clamp the shaft to form a fixed effect that cannot slide to the distal end, the assembly department of the limited tong piece can be arranged on the shaft, the size of the mouth of the clamp tong is adjusted, and the cross body end of the assembly department is provided with a resting plate, the first chuck is attached to the two sides of the shaft by the resting plate and the assembly department, when the first chuck is used for clamping the target workpiece, the resting plate can clamp the shaft to reduce the inclination of the limited tong arm under stress, and the first chuck is arranged on the end of the limited tong arm of the assembly department, the first chuck is a T-shaped body, has a first clamping surface, the opposite end of the first clamping surface is pivotally arranged on the end of the limited tong arm by a first pivot, the first chuck is allowed to swing on the end of the limited tong arm, even if the assembly department is inclined to clamp the shaft, the first clamping surface of the first chuck can still be placed on the target workpiece.

[0022] The utility model further provides a big mouthed tongs structure, wherein, the second chuck is arranged on the end of the movable tong arm of the movable tong piece, the second chuck is a T-shaped body, has a second clamping surface, the opposite end of the second clamping surface is pivotally arranged on the end of the movable tong arm by a second pivot, the second chuck is allowed to swing on the end of the movable tong arm, the movable tong arm is rotated and swung towards the target workpiece, and the second clamping surface of the second chuck can naturally adjust and lie on the target workpiece, and firmly transmit the clamping force on the target workpiece.

[0023] The utility model further provides a big mouthed tongs structure, wherein, the two ends of the long rod body of the shaft are provided with a limited piece protruding from the surface of the long rod body at least at one end, and the limited piece can limit the shaft from being separated from the support head.

[0024] When the second chuck of the clamp tong is blocked or limited, only the first handle and the second handle need to be close to each other and be gripped and forced, at the initial stage of output, the first handle will first be inclined by an angle to clamp the shaft in the through hole, so that the support head is fixed on the shaft, and in the later output process, the second handle swings around the first shaft pin, and the movable tong piece is pushed to rotate and swing by the support of the connecting rod, so that the second chuck of the movable tong arm generates a clamping force towards the first chuck.

[0025] That is, when the target workpiece is to be clamped by the clamp, the shaft rod can be adjusted to move left and right on the support head of the first handle, so that the first clamp head and the second clamp head are in contact with the target workpiece; when the second handle starts to move towards the first handle, the reaction force generated by the target workpiece blocking the second clamp head promotes the first handle to swing, so that the support head can be clamped by the shaft hole at the beginning of the second handle gripping, so that the position of the pivot part is fixed; thus, during the continuous gripping operation of the second handle, the first shaft pin can be slightly rotated around the pivot part, so that the movable clamp arm can complete the clamping action on the target workpiece through the second clamp head under the condition that the limiting clamp arm and the first clamp head are fixed.

[0026] The clamp structure can easily adjust the size of the clamp opening between the first clamp head and the second clamp head in a long distance within the length range of the shaft rod to correspond to the clamping of oversized target workpieces, thereby significantly improving or expanding the clamping range of the clamp on target workpieces. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a plan view of the structure of the utility model;

[0028] Figure 2 It is a combined structure diagram when the first and second handles of the utility model are cut;

[0029] Figure 3 It is Figure 2 the enlarged view of A part of the utility model;

[0030] Figure 4 It is an exploded perspective view of the limiting clamp structure of the utility model;

[0031] Figure 5 It is a plan view of the structure of the first handle of the utility model;

[0032] Figure 6 It is a state diagram when the second handle of the utility model is operated;

[0033] Figure 7 It is Figure 6 the enlarged view of B part of the utility model;

[0034] Figure 8 It is a state diagram when the clamp opening of the utility model is in place on the target workpiece;

[0035] Figure 9 It is a state diagram when the second handle starts to operate after the clamp opening of the utility model is in the target workpiece;

[0036] Figure 10The first handle state schematic diagram when the second handle operation process is completed.

[0037] Figure 11 The state schematic diagram when the clamp completes target workpiece clamping.

[0038] Mark explanation: clamp 10; work center line CE; target workpiece 11; first handle 20; holding part 21; support head 22; side wall 220; through shaft hole 221; screw hole 23; shaft 24; long shaft hole 240; limit release 241; screw rod 25; rotary operation head 250; blocking column 26; limit clamp part 30; assembly part 31; bridging part 310; sleeve shaft hole 311; abutting plate 312; limit clamp arm 32; first clamp head 33; first clamping surface 330; first pivot 331; movable clamp part 40; movable clamp head 41; movable clamp arm 42; pivot part 43; first pivot connection part 44; second clamp head 45; second clamping surface 450; second pivot 451; pull-out part 46; clamp opening 50; elastic part 60; second handle 70; grabbing part 71; first shaft pin 72; second shaft pin 73; third shaft pin 74; unlocking part 80; push part 81; unlocking operation part 82; connecting rod part 90; arc convex part 91; blocking part 92. DETAILED DESCRIPTION

[0039] In order to achieve the above purpose, the utility model discloses a preferred embodiment, and the accompanying drawings are as follows:

[0040] As Figures 1-5 Indicated, the utility model provides a big clamp opening pliers structure, is a clamp 10, including:

[0041] A first handle 20 is extended to form a support head 22 at one end of a sectional C-shaped holding part 21, and is provided with a screw hole 23 at the other end; and the ventral side of the support head 22 has a side wall 220, and a through shaft hole 221 is formed in the side wall 220;

[0042] A shaft 24 is a long rod body 240 with a sectional shape relative to the through shaft hole 221, which is passed through the through shaft hole 221 and installed on the support head 22, and the axis of the long rod body 240 is defined as a work center line CE of the clamp 10;

[0043] A limit clamp part 30 is located outside one side of the side wall 220 of the support head 22, is arranged on the shaft 24, has a surface abutting the shaft 24, and is composed of a plate-shaped assembly part 31 arranged on the shaft 24, one end of the assembly part 31 located above the work center line CE is away from the shaft 24 and extends a limit clamp arm 32, and the limit clamp arm 32 is an arm body with a shape close to inverted U (or n shape), and is provided with a first clamp head 33 at the end.

[0044] An active jaw member 40 is located at the other side of the side wall 220 of the support head 22, corresponding to the assembly portion 31 of the defined jaw member 30, having an active jaw head 41 identical to the assembly portion 31 and a plate body identical to the same face of the shaft 24, an end of the active jaw head 41 above the work center line CE is away from the shaft 24, extending an active jaw arm 42, and the end edge corner below the work center line CE is respectively provided with a pivot portion 43 pivoted with the support head 22 and a first pivot portion 44 away from the support head 22; and the active jaw arm 42 is a arm body close to a f shape (or n shape) corresponding to the defined jaw arm 32, and an end is provided with a second chuck 45; in addition, a buckle portion 46 is provided between the pivot portion 43 and the first pivot portion 44 of the active jaw head 41;

[0045] A resilient member 60 (ideally a tensile spring) has one end fixedly arranged on the holding portion 21 and the other end connected to the buckle portion 46 for pulling the active jaw member 40 back to its original position after swinging;

[0046] A second handle 70 is provided with a first shaft pin 72 at one end of a gripping portion 71 and pivoted with the first pivot portion 44, and a second shaft pin 73 is provided at a distance from the tail portion, and a third shaft pin 74 is provided between the first shaft pin 72 and the second shaft pin 73;

[0047] An unlocking member 80 is pivoted with the second shaft pin 73 at the middle portion, and one end of the pivoted position is provided with a push portion 81, and the other end is formed with an unlocking operation portion 82;

[0048] A connecting rod member 90 has an arc convex portion 91 opposite the push portion 81, one end of the arc convex portion 91 is pivoted with the third shaft pin 74, and the other end extends to the holding portion 21, forming a stop portion 92;

[0049] A screw 25 is screwed with the screw hole 23, one end abutting against the stop portion 92 on the holding portion 21, and the other end extending out of the screw hole 23, forming a rotating operation head 250;

[0050] As shown in Figure 6 、 Figure 7 When the second chuck 45 of the clamp 10 is blocked or limited (such as contacting the clamped target workpiece), only the first handle 20 and the second handle 70 need to be close to each other and tightly applied force, and at the initial stage of the output, the first handle 20 will first swing an angle α (this angle α, please refer to Figure 3 、 Figure 7As shown, the thickness of the side wall 220 and / or the gap between the through hole 221 and the shaft 24 are determined or set (ideally about 5 degrees). This causes the through hole 221 to clamp (lock) the shaft 24, so that the support head 22 achieves a fixed function on the shaft 24 without slipping. In the later output process, the swing of the second handle 70 around the first shaft pin 72 is driven by the resistance support of the connecting rod 90 to push the movable clamp 40 to swing, so that the second clamp 70 of the movable clamp arm 42 generates a clamping force in the direction of the first clamp 33.

[0051] That is, such as Figure 8 As shown, when using the clamp 10 to clamp the target workpiece 11, the shaft 24 can be adjusted by sliding left and right on the support head 22 (i.e., the through hole 221) of the first handle 20 (or, the assembly part 31 of the limiting clamp 30 can be adjusted by assembling, fixing, or limiting the position on the shaft 24), so that the first chuck 33 and the second chuck 45 are close to or touch the target workpiece 11; Figure 9 , Figure 10 As shown, when the second grip 70 is brought closer to the first grip 20 and the gripping part 71 is brought closer to the holding part 21 to exert force, the stationary target workpiece 11 blocks the reaction force generated by the second chuck 45, causing the first grip 20 to deflect (please refer to...). Figure 6 As shown, by angular α deflection, the support head 22 will initially grip the second handle 70 (see [reference]). Figure 3 , Figure 7 As shown, the shaft 24 can be clamped (locked) through the through-hole 221, thus fixing the position of the pivot 43; in this way, as Figure 11 As shown, the continuous gripping operation of the second handle 70 (gripping part 71) is achieved by the limiting support of the second handle 70 by the connecting rod 90. The slight swinging motion of the first pivot pin 72 around the pivot part 43 allows the movable clamp arm 42 to perform a clamping action on the target workpiece 11 through the second clamp 45, while the limiting clamp arm 32 and the first chuck 33 are fixed.

[0052] like Figure 2 , Figure 11 As shown, the overall structure of the clamp 10 allows for easy adjustment of the jaw 50 between the first chuck 33 and the second chuck 45 over a long distance within the length of the shaft 24 to accommodate the clamping of ultra-large target workpieces 11, thereby significantly improving or expanding the clamping capability of the clamp 0 for the target workpiece 11.

[0053] According to the above embodiments, preferably, as follows: Figure 2 , Figure 5As shown, the through-hole 221 of the support head 22 of the first grip 20 is a flat elongated hole, and the shaft 24 is a long rod 240 of a ruler-shaped flat iron that can slide freely in and out of the through-hole 221, with a cross-section relative to the shape of the through-hole 221; a large surface area is formed between the shaft 24 and the movable clamp head 41 of the movable clamp 40, such as Figures 8-11 As shown, the swinging motion of the movable clamp 40 can be limited or guided by the surface properties of the shaft 24 during the swinging motion of the movable clamp head 41, thereby reducing swaying or deviation.

[0054] According to the above embodiments, preferably, such as Figure 2 As shown, the support head 22 of the first grip 20 has at least one stop post 26 fixed above and below the working center line CE, close to the shaft 24 (ideally, one stop post 26 is provided on the upper and lower sides of the shaft 24). The at least one stop post 26 assists the through hole 221 in supporting the shaft 24, which not only increases the resistance of the through hole 221 to hole deformation, but also reduces or avoids excessive horizontal tilting of the two ends of the shaft 24 when it passes through the through hole 221.

[0055] According to the above embodiments, optionally, such as Figure 2 As shown, the assembly part 31 of the limiting clamp 30 is fixed to the outside of the non-movable clamp 40 end on one side of the side wall 220 of the support head 22 (not shown, for example, it can be fixed by screw locking) on ​​the shaft 24; by fixing the assembly part 31 of the limiting clamp 30 to the shaft 24, the relationship between the first clamp 33 (including the limiting clamp arm 32) and the shaft 24 is fixed, so that the clamp 10 can slide left and right on the shaft hole 221 of the support head 22 through the shaft 24 (not shown), and adjust the size of the jaw 50 of the clamp 10.

[0056] According to the above embodiments, preferably, such as Figure 2 , Figure 3 , Figure 4 As shown, the assembly part 31 of the limiting clamp 30 abuts against the shaft 24. The assembly part 31 has a cross-connector 310. The cross-connector 310 has a shaft hole 311 that is opposite to the cross-sectional shape of the shaft 24, and the shaft 24 passes through the shaft hole 311 to assemble the assembly part 31 onto the shaft 24. Figure 6 , Figure 7 As shown, when the first chuck 33 of the limiting clamp 30 is blocked, the assembly part 31 slightly tilts by an angle β, which causes the sleeve shaft hole 311 to clamp (lock) the shaft 24, preventing it from sliding to the distal end. Figure 8As shown, the assembly portion 31 of the defined jaw member 30 is capable of sliding displacement on the shaft 24, so as to adjust the size of the jaw 50 of the clamp 10 to match the target workpiece 11; as shown Figure 4 As shown, the end of the assembly portion 31 of the defined jaw member 30 is provided with a resting plate 312, which, together with the assembly portion 31, abuts against both sides of the shaft 24, as shown Figure 1 、 Figure 11 As shown, when the first clamp head 33 is used to clamp the target workpiece 11, the abutment of the resting plate against the shaft 24 can reduce the deflection of the defined jaw arm 32 when it is subjected to force; as shown Figure 2 、 Figure 4 As shown, the end of the defined jaw arm 32 extending from the assembly portion 31 is provided with the first clamp head 33, which is in the shape of a T and has a first clamping surface 330. The opposite end of the first clamping surface 330 is pivotally connected to the end of the defined jaw arm 32 by a first pivot 331, so that the first clamp head 33 is allowed to swing on the end of the defined jaw arm 32, as shown Figure 8 、 Figure 9 As shown, even if the assembly portion 31 is deflected to clamp the shaft 24, the first clamping surface 330 of the first clamp head 33 can still be snugly placed on the target workpiece 11.

[0057] According to the above embodiment, preferably, as shown Figure 2 As shown, the end of the defined jaw arm 32 extending from the assembly portion 31 is provided with the first clamp head 33, which is in the shape of a T and has a first clamping surface 330. The opposite end of the first clamping surface 330 is pivotally connected to the end of the defined jaw arm 32 by a first pivot 331, so that the first clamp head 33 is allowed to swing on the end of the defined jaw arm 32, as shown Figure 4 As shown, even if the assembly portion 31 is deflected to clamp the shaft 24, the first clamping surface 330 of the first clamp head 33 can still be snugly placed on the target workpiece 11. Figures 8-11 As shown, even if the assembly portion 31 is deflected to clamp the shaft 24, the first clamping surface 330 of the first clamp head 33 can still be snugly placed on the target workpiece 11.

[0058] According to the above embodiment, optionally, as shown Figure 2 、 Figure 4 As shown, the end of the defined jaw arm 32 extending from the assembly portion 31 is provided with the first clamp head 33, which is in the shape of a T and has a first clamping surface 330. The opposite end of the first clamping surface 330 is pivotally connected to the end of the defined jaw arm 32 by a first pivot 331, so that the first clamp head 33 is allowed to swing on the end of the defined jaw arm 32, as shown

[0059] The above description is only illustrative in nature and is not intended to limit the present application, and those skilled in the art can understand that many modifications, changes or equivalents can be made without departing from the spirit and scope defined in the appended description, but all will fall within the protection scope of the present application.

Claims

1. A large jaw tongs structure, which is a clamp, characterized in that, The utility model relates to a first handle, which is extended from one end of a C-shaped holding part to form a support head, and is provided with a screw hole at the other end; the support head has a side wall on the ventral side, and a through shaft hole is formed in the side wall; A shaft rod is a long rod body with a cross section corresponding to the shape of the through shaft hole, which passes through the through shaft hole and is installed on the support head, and the axis of the long rod body is defined as a working center line of the clamp; A limiting clamp part is located outside one side of the side wall of the support head, is installed on the shaft rod, has a surface abutting against the shaft rod, and is provided with an assembly part installed on the shaft rod, which is located at one end of the limiting clamp part above the workpiece center line of the target workpiece and extends a limiting clamp arm, which is an n-shaped arm body with a first clamp head at the end; A movable clamp part is located outside the other side of the side wall of the support head, corresponds to the assembly part of the limiting clamp part, has a movable clamp head part identical to the assembly part and abutting against the same surface of the shaft rod, and is located at one end of the movable clamp head part above the working center line and away from the shaft rod and extends a movable clamp arm, and a pivot part pivoted to the support head and a first pivot part away from the support head are respectively arranged at the edge corner below the working center line; the movable clamp arm corresponds to the limiting clamp arm and is an n-shaped arm body, and a second clamp head is arranged at the end of the movable clamp arm; a pulling part is arranged between the pivot part of the movable clamp head part and the first pivot part; A spring part is fixed at one end of the holding part and is connected to the pulling part at the other end, and is used for pulling the movable clamp part to return after swinging; A second handle is provided with a first shaft pin pivoted to the first pivot part at one end of a gripping part, a second shaft pin is arranged at a distance from the tail part at the other end, and a third shaft pin is arranged between the first shaft pin and the second shaft pin; An unlocking part is pivoted to the second shaft pin at the middle part, has a push part at one end of the pivoted position, and forms an unlocking operation part at the other end; An connecting rod part has an arc convex part opposite the push part, one end of the arc convex part is pivoted to the third shaft pin, the other end extends to the holding part and forms a stop part; A screw rod is screwed into the screw hole, one end of the screw rod abuts against the stop part on the holding part, and the other end of the screw rod extends out of the screw hole and forms a rotating operation head part. The through shaft hole of the support head of the first handle is a flat long hole, the cross section of the shaft rod corresponds to the shape of the through shaft hole, and the shaft rod is a size-shaped flat iron which can pass through the through shaft hole and can freely slide in and out.

2. The large jawed forceps structure of claim 1, wherein, At least one stop column close to the shaft rod is fixed above and below the working center line of the support head of the first handle.

3. The large jawed forceps structure of claim 1, wherein, The assembly part of the limiting clamp part is fixed on the shaft rod outside the movable clamp part end of one side of the side wall of the support head.

4. The large jawed forceps structure of claim 1, wherein, The assembly part of the limiting clamp part abuts against one surface of the shaft rod, the assembly part forms a bridging body, a sleeve shaft hole is formed in the bridging body corresponding to the shape of the cross section of the shaft rod, and the sleeve shaft hole is used for passing the shaft rod to install the assembly part on the shaft rod.

5. The large jawed forceps structure of claim 1, wherein, The end of the bridging body of the assembly part forms a resting plate.

6. The large jawed forceps structure of claim 5, wherein, ​ 7. The large jawed forceps structure of claim 5, wherein, The first clamping head is arranged at the end of the assembly part, and the first clamping head is a T-shaped body having a first clamping surface, and the opposite end of the first clamping surface is pivotally arranged on the end of the defined arm by a first pivot.

8. The large jawed forceps structure of claim 1, wherein, The second clamping head is arranged at the end of the movable arm of the movable tongs, and the second clamping head is a T-shaped body having a second clamping surface, and the opposite end of the second clamping surface is pivotally arranged on the end of the movable arm by a second pivot.

9. The large jawed forceps structure of claim 1, wherein, The shaft rod has a long rod body, and at least one end of the long rod body is radially provided with a limiting part protruding from the surface of the long rod body.

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