Quick-clamp flat nose pliers

Abstract

The present invention discloses a high-quality quick-clamping flat-nose pliers specially developed and designed for users in the machinery manufacturing industry, which is time-saving and labor-saving in operation and extremely safe. This high-quality quick-clamping flat-nose pliers is a quick-clamping flat-nose pliers with a brand-new structure that we have developed after a comprehensive search and analysis of the entire market of existing flat-nose pliers at home and abroad for many years. The horizontal bottom surface of the movable jaw is tightly pressed against the upper end surface of the slide rail under the action of the clamping nut and the screw resetting device, and the front end of the clamping screw is supported on the upper front clamping surface of the movable jaw, avoiding the defect of "upward" of the workpiece on the side of the movable jaw, thereby ensuring accurate positioning and high-precision processing of the workpiece. These unique structures thoroughly solve the very serious unsafe hidden dangers of existing quick-clamping flat-nose pliers; this product has reached the international leading level in terms of safe use and efficient, fast and convenient clamping of workpieces.

Description

Technical Field

[0001] The invention relates to the technical field of machine flat-nose pliers, in particular to a quick-clamping flat-nose pliers. Background Art

[0002] Flat-nose pliers are a common fixture in the field of mechanical processing, used to clamp workpieces for cutting processing. They are random accessories for milling machines, drilling machines or CNC machine tools. Usually, the most commonly used flat-nose pliers on the market include a base, a bracket, a nut, a fixed jaw, a movable jaw, a slide rail, a screw cylinder and other parts. The upper end surface of the base is fixed with two parallel support frames, the upper end of the support frame is fixed with a slide rail, and a lead screw is provided between the support frames. One end of the slide rail is vertically fixedly connected to the fixed jaw, and the slide rail is slidably connected with the movable jaw. The lower end of the movable jaw is fixed with a nut. After the lead screw is threadedly connected to the nut, one end of the lead screw is fixedly connected to the fixed jaw through a bearing, and the other end is fixedly connected to the handle. When using a milling machine to process parts, workers have to use a sleeve or knock the handle to fix the parts during operation. However, during processing, due to the vibration of the machine tool, the flat-nose pliers will loosen, affecting the accuracy of the processed parts and failing to meet the required technical requirements. When loosening the jaws after processing, workers also have to use a lot of force to loosen them, which seriously affects the work progress and processing quality.

[0003] In order to solve the above technical problems, new products such as: hydraulic flat-nose pliers, such as the new hydraulic flat-nose pliers disclosed online in CN2012201305893; pneumatic flat-nose pliers, such as a pneumatic flat-nose pliers disclosed online in CN2017110272078, a high-strength fixed clamping flat-nose pliers disclosed in CN2017105276666; magnetic flat-nose pliers, such as a magnetic flat-nose pliers disclosed online in CN2016107528900. Although the above-mentioned hydraulic flat-nose pliers and pneumatic flat-nose pliers increase the clamping speed and reduce the labor intensity of workers, they generally still have some defects. One is the defect of "warping up" of the workpiece when clamping. That is, the common structure of existing machine flat-nose pliers is to use a clamping screw to thread the clamping nut at the lower end of the movable jaw to drive the clamping surface of the upper part of the movable jaw and the clamping surface of the fixed jaw to clamp the workpiece. The substantial disadvantage of this structure is that when clamping the workpiece, it is necessary to knock the workpiece so that the workpiece positioning reference and the flat-nose pliers reference surface completely coincide. However, the workpiece will still "warp up" on the side of the movable jaw, which makes the clamping force very small; it cannot meet the needs of workpiece clamping, and thus cannot ensure the precise positioning of the workpiece, let alone the high precision of workpiece processing.

[0004] Second, since the jaws are tilted upward, false clamping of the workpiece is caused. Therefore, these flat-nose pliers are prone to safety accidents when clamping the workpiece in an upright or sideways position. In addition, the existing flat-nose pliers are not provided with the positioning reference surface required for upright or sideways installation. Therefore, the scope of use of the flat-nose pliers is greatly limited.

[0005] Third, the rear part of the slide rail of some flat-nose pliers is a disconnected opening structure, which makes it very easy for the flat-nose pliers to open and deform outwards during long-term use, thereby affecting the use of the flat-nose pliers.

[0006] Fourth, the flat-nose pliers of the existing structure cannot clamp the workpiece sideways for processing. Therefore, when the workpiece needs to be clamped sideways for processing, the workpiece cannot be completely positioned and clamped because the flat-nose pliers of the existing structure cannot eliminate the sixth degree of freedom of the clamped workpiece.

[0007] Fifth, the existing flat-nose pliers cannot stably clamp workpieces of certain sizes, which is very dangerous. This is also a situation that operators do not want to encounter. In this case, not only the workpiece and the tool will be damaged, but also the machine tool will be damaged. Through our investigation and search of various structures of quick pliers at home and abroad, we found that there is currently no company that has a device on the flat-nose pliers that can indicate the forward or backward adjustment range of the movable pliers in the current state. In other words, all structures of quick flat-nose pliers at home and abroad currently have such unsafe hidden dangers. The method to eliminate this unsafe hidden danger has long been a great desire of the entire pliers manufacturing companies and users.

[0008] Sixth, users who have used flat-nose pliers know that, in general, when installing flat-nose pliers, they need to use several pressure plates, tightening screws, trapezoidal nuts and other parts to complete the fixation. This installation method takes up a lot of space. If you want to install multiple flat-nose pliers on the same workbench or install flat-nose pliers on a narrow work surface, it will be difficult. This requires us to consider redesigning a flat-nose pliers structure with a smaller structure size, preferably without the pressure plate, to meet the safe use of flat-nose pliers in a variety of installation methods.

[0009] Therefore, in view of the various defects existing in the existing flat-nose pliers, in order to completely solve all the defects existing in the existing flat-nose pliers, we must spend a lot of effort to conduct a comprehensive analysis and processing from the overall structure and local structure of the flat-nose pliers, and then create a new structure, high-standard, super-performance, powerful and quick clamping flat-nose pliers. Summary of the invention

[0010] The purpose of the present invention is to solve the shortcomings of the prior art and provide a quick clamping flat-nose pliers with sophisticated structure, strong workpiece clamping force, precise positioning, high workpiece processing accuracy, safety and reliability, fast clamping speed, high work efficiency, simple production, and no upward warping on the movable jaw side.

[0011] The technical solution adopted by the present invention to solve its technical problem is:

[0012] A quick clamping flat-nose pliers, comprising a base, a support frame, a slide rail, a fixed jaw, a movable jaw, a clamping nut, and a clamping screw. Two parallel support frames are fixed on the upper end surface of the base, a slide rail is fixed on the upper end of the support frame, a clamping screw is arranged between the support frames, one end of the slide rail is vertically fixedly connected to the fixed jaw, and a movable jaw is slidably connected to the slide rail. The pliers are characterized in that they also include a support arm, a hook pin connector, a hook pin and a screw resetting device.

[0013] The movable jaw body is composed of a front vertical surface, a rear vertical surface, a left vertical surface, a right vertical surface, a horizontal bottom surface and an upper cover, the front end of the horizontal bottom surface is vertically fixedly connected to the front vertical surface, the rear end is vertically fixedly connected to the rear vertical surface, the left end is vertically fixedly connected to the left vertical surface, and the right end is vertically fixedly connected to the right vertical surface, the left sides of the front vertical surface and the rear vertical surface are respectively vertically fixedly connected to the left vertical surface, and the right sides are respectively vertically fixedly connected to the right vertical surface, and the periphery of the lower end of the upper cover is respectively fixedly connected to the front vertical surface, the rear vertical surface, the left vertical surface and the right vertical surface by screws, so that a driving cavity is formed in the movable jaw body, the center of the horizontal bottom surface is provided with a movable through groove of a hook pin connector, the lower end surface is provided with a slideway matching with a slide rail, the upper end surface of the rear vertical surface is provided with a movable through groove of a lead screw, and the movable through groove of the lead screw is vertically arranged.

[0014] The inner side walls of the two parallel slide rails are symmetrically provided with travel positioning rails, and the lower end surfaces of the travel positioning rails are provided with clamping positioning slots in a linear array along the moving direction of the slide rails, and the movable jaws are clamped and positioned through the clamping positioning slots.

[0015] The clamping nut is arranged in the driving cavity of the movable jaw, a threaded through hole is arranged horizontally in the center of the clamping nut, both sides of the clamping nut extend outward to form a support arm, and the lower end extends vertically downward and then extends forward to deviate from the perpendicular line of the clamping nut axis to form a " "-shaped hook pin connector, the lower end of the hook pin connector is provided with a hook pin insertion hole, the middle part of the hook pin is fixedly plugged with the hook pin insertion hole by a locking screw, and the two ends are axially extended into cylindrical sections and contact the clamping positioning groove through the side wall of the cylindrical section, and the lower end of the support arm is in conflict with the horizontal bottom surface of the movable jaw, so as to facilitate the clamping screw to be constrained and supported by the support arms on both sides of the clamping nut, the screw reset device and the screw movable through groove,

[0016] The clamping screw is made of a spherical top holding surface at the front end, a threaded moving section, a cylindrical section, and a handle section coaxially and integrally. After the cylindrical section of the clamping screw passes through the screw movable groove and is threadedly connected to the threaded through hole in the center of the clamping nut through the threaded moving section, the spherical top holding surface at the front end of the clamping screw conflicts with the front vertical surface of the movable jaw. The clamping screw is connected to the horizontal bottom surface of the movable jaw through a screw reset device to facilitate clamping and positioning of the movable jaw.

[0017] The spherical top holding surface at the front end of the clamping screw pushes the movable jaw to move along the slide rail, further applying clamping force to the workpiece, so that the workpiece is accurately clamped by the fixed jaw and the movable jaw. When the machine tool vibrates, the flat-nose pliers are moved by the clamping nut The hook pin at the lower end of the nut limits the position of the movable jaw, and the support arms on both sides of the clamping nut press down the horizontal bottom surface of the movable jaw, so that the horizontal bottom surface of the movable jaw and the slide rail generate resistance and are fixed on the slide rail. At the same time, the clamping screw at the upper end of the clamping nut directly applies a forward pressing force to the front vertical surface of the movable jaw, so that the movable jaw tilts forward with the hook pin as the center of the circle, and then the clamping surface of the front vertical surface generates a clamping force to press down the workpiece, which solves the technical problem of "upward warping" and loosening of the clamping surface of the movable jaw during the clamping process due to the lack of external force constraint on the clamping surface of the movable jaw; when the jaws are released after the workpiece is processed, the operator only needs to rotate the clamping screw in the opposite direction to quickly release and take out the processed workpiece, and then place the workpiece to be processed on the clamping surfaces of the fixed jaw and the movable jaw, and rotate the clamping screw forward again to quickly clamp it, and repeat this process, which greatly improves the working speed, thereby ensuring the precise positioning of the workpiece and high-precision processing.

[0018] The screw reset device of the present invention comprises a screw return sleeve, a reset rod, a reset spring and a stop block. A reset rod insertion hole is provided on the horizontal bottom surface. The screw return sleeve is movably sleeved on the clamping screw. The lower end of the screw return sleeve is fixedly connected to the reset rod. After the reset rod passes through the reset rod insertion hole and the reset spring in sequence, the lower end of the reset rod is fixedly connected to the stop block. The upper end of the reset spring abuts against the horizontal bottom surface of the movable jaw, and the lower end abuts against the stop block, so as to facilitate controlling the clamping screw in the movable through groove of the screw through the reset spring, ensuring that the clamping screw is horizontally tightened against the front vertical surface of the movable jaw, thereby further improving the machining accuracy of the workpiece.

[0019] The present invention can provide a hook pin locking device in a mirror image between the clamping nut and the rear vertical surface of the movable jaws on both sides of the clamping screw, which includes a tension spring and a positioning pin. One end of the tension spring is in conflict with the positioning groove provided on the side wall of the support arm, and the other end is fixedly sleeved on the positioning pin. The positioning pin is fixedly connected to the rear vertical surface. When the hook pin at the lower end of the clamping nut is fully inserted into the slot at the position under the action of the tension spring, the axial center line of the clamping nut is parallel to the horizontal bottom surface, and the clamping nut is maintained in the locked state under the action of the tension spring, so as to prevent the hook pin from not fully entering the slot to form false clamping and cause accidents.

[0020] The bottom surface of the support arm described in the present invention transitions in an arc shape from the front end to the rear end to form an arc surface, the arc surfaces of the support arms on the left and right sides are on the same cylindrical surface, and the axis line of the arc surface is parallel to the axis line of the hook pin, so as to ensure that when the clamping screw lifts the clamping nut, the bottom surfaces of the support arms on both sides of the clamping nut are always in line contact with the horizontal bottom surface through the arc surface, which not only ensures the flatness of the horizontal bottom surface, but also ensures the surface contact between the hook pin and the slot and the accuracy of the slot, and ensures the smooth movement of the movable jaws.

[0021] The present invention can provide an indicator device on the movable jaw, and the indicator device includes an indicator rod, one end of which passes through the movable through slot of the screw and extends out of the through hole of the indicator rod, so that the moving distance of the movable jaw can be observed through the change of the extension margin of the indicator rod, so that the workpiece can be safely and stably clamped on the flat-nose pliers by the fixed jaw and the movable jaw.

[0022] The present invention also provides an indicator rod through hole on the rear vertical surface of the movable jaw, one end of the indicator rod passes through the indicator rod through hole and extends out of the indicator rod through hole, and the other end is fixed to the clamping nut through a pin. When the clamping nut is positioned in a certain slot on the travel positioning track by the hook pin at the lower end, the clamping screw is rotated, and the clamping screw pushes the movable jaw body forward along the slide rail. The operator can see the adjustable clamping margin of the movable jaw by the change in the extended length of the indicator rod, so that the workpiece is safely and stably clamped on the flat-nose pliers by the fixed jaws and the movable jaws.

[0023] The indicating device described in the present invention can also be composed of a baffle, an indicating rod and a top spring. The indicating rod is movably inserted in the indicating rod through hole provided on the rear vertical surface, one end of which extends out of the rear vertical surface, and the other end is fixedly connected to the baffle. A top spring is sleeved on the indicating rod, one end of which is in conflict with the baffle, and the other end is in conflict with the rear vertical surface. Under the tension of the top spring, the baffle is always in conflict with the clamping nut. When the clamping screw pushes the movable jaw forward along the slide rail, the indicating rod always follows the movement of the clamping nut under the tension of the top spring. The operator can see the adjustable clamping margin of the movable jaw by the change in the extending length of the indicating rod, so that the workpiece can be quickly and stably clamped on the flat-nose pliers by the fixed jaws and the movable jaws.

[0024] The present invention can provide a front connecting block at the front end of the slide rail and a rear connecting block at the rear end. The front ends of the two parallel slide rails are fixedly connected via the front connecting block, and the rear ends are fixedly connected via the rear connecting block, so as to prevent the two parallel slide rails from deforming outward at both ends during long-term use. The front connecting block and the rear connecting block respectively form square holes with the support frame and the base that can be conveniently lifted by hand, which not only ensures the parallelism of the slide rails, but also allows the operator to quickly lift the flat-nosed pliers through the square holes at the front and rear ends of the flat-nosed pliers, thereby achieving the effect of convenient movement.

[0025] The present invention can fix a limit screw at the lower end of the horizontal bottom surface of the movable jaw, and the limit screw is located at the rear of the screw reset device, so as to control the misoperation of the movable jaw during the backward movement, and avoid the screw reset device colliding with the connecting surface and making the clamping screw unusable.

[0026] The hook pin of the present invention is coaxially integrated with a thick cylindrical section in the middle and thin cylindrical sections of the same diameter at both ends of the thick cylindrical section to ensure that the hook pin can withstand a large load when engaged with the slot, ensure the concentricity of the hook pin, and avoid damage to the smoothness of the slot surface due to deformation of the hook pin.

[0027] The front end face of the fixed jaw of the present invention is parallel to the clamping face of the fixed jaw and is perpendicular to the upper end face of the slide rail, so that the front end face of the fixed jaw is used as a positioning reference face when it is installed in an upright position. A fixing hole is provided on the front end face of the fixed jaw, and a locking piece is provided on the movable jaw. The locking piece is composed of a limit rod and a pin, and pins are vertically fixed at both ends of the reset rod. When the flat-nosed pliers is installed in an upright position, after the limit rod bypasses the clamping screw, the two pins are inserted into the lower end of the horizontal bottom face of the movable jaw, limiting the clamping screw in the movable through groove of the screw, thereby ensuring the safe use of the flat-nosed pliers in an upright position.

[0028] Alternatively, the front end face of the fixed jaw is parallel to the clamping face of the fixed jaw and is perpendicular to the upper end face of the slide rail, so that the front end face of the fixed jaw is used as a positioning reference face when it is installed upright. A fixing hole is provided on the front end face of the fixed jaw, and a locking piece is provided on the movable jaw. The locking piece is composed of a limit rod and a pin, and pins are vertically fixed at both ends of the reset rod. A locking piece socket is provided on the rear vertical face of the movable jaw. When the flat-mouth pliers is installed upright, the locking piece bypasses the clamping screw, and the pins at both ends are inserted into the locking piece socket to fix the clamping screw in the movable through groove of the screw.

[0029] The limiting rod of the locking member of the present invention can be in the shape of a straight rod, an arc, or a U shape.

[0030] The cam is a vertical cam which has two holes arranged on the side of the base for camming the bottom of the support frame, and the holes are arranged on the cam for camming the bottom of the support frame.

[0031] The lower end of the fixed jaw of the present invention is fixedly connected to the slide rail via a fastening screw or a pin, so as to solve the technical problems in the prior art that when the fixed jaw and the base are integrated into an integral structure, the manufacturing of the clamping surface is difficult and costly, and there are safety hazards especially during grinding.

[0032] The present invention can symmetrically provide a plurality of threaded holes on the left and right sides of the fixed jaw for connecting and installing functional parts capable of eliminating the sixth degree of freedom.

[0033] The present invention can fix a rear clamping panel on the clamping surface of the fixed jaw, and the lower end of the rear clamping panel is fixedly connected to the slide rail, and a front clamping panel is fixed on the front vertical surface of the movable jaw, and the lower end of the front clamping panel is matched with the gap of the slide rail, and the gap between the front clamping panel and the slide rail is smaller than the thickness of the chips, so as to prevent the chips from entering the gap between the clamping panel and the slide rail and scratching the upper end surface of the slide rail, and the slideway is composed of a groove, a hook plate and a set screw provided at the lower end of the horizontal bottom surface, and after the groove cooperates with the slide rail and slides and engages, the lower end slides against the lower end surface of the slide rail through the hook plate. The hook plate is fixedly connected to the lower end of the horizontal bottom surface by a set screw, and supporting through holes are respectively provided on the left and right sides of the front upper end of the hook plate. A supporting pad is provided between the hook plate and the clamping panel, and the lower end of the supporting pad is plugged into the supporting through hole, and the upper end is supported by the front clamping panel to make it easier to process the clamping surface of the movable jaw. At the same time, it can also avoid supporting the clamping panel through the supporting pad when the workpiece is slightly knocked perpendicular to the upper end surface of the slide rail, thereby ensuring the stability of the clamping panel and making it easier to make the movable jaw.

[0034] The present invention can provide a square mounting hole on the upper plane at the rear of the slide rail, the width of the square mounting hole is greater than the spacing of the slide rail, so as to facilitate the assembled hook pin to be quickly and accurately installed in the clamping and positioning groove below the slide rail through the square mounting hole.

[0035] The present invention can also provide two front hidden through holes and rear hidden through holes on the lower bottom surface of the base for front and rear installation of quick clamping flat-nose pliers. The front hidden through hole is located below the fixed jaws, and the rear hidden through hole is located below the square installation hole, so that it can be used on a narrow work surface.

[0036] The fixed jaw of the present invention is provided with a tool through hole coaxial with the front hidden through hole, so that a tool can be conveniently and quickly screwed into the front hidden through hole through the tool through hole, and the base is fixed on a narrow work surface, so that it can be used on a narrow work surface.

[0037] The base below the slide rail of the present invention is provided with an iron filings outlet to achieve the effect of quickly removing the iron filings.

[0038] The upper end surface of the slide rail and the bottom surface of the base of the present invention are respectively subjected to quenching treatment to ensure the flatness of the upper end surface of the slide rail and the base during long-term use and improve the accuracy of workpiece clamping.

[0039] Due to the adoption of the above structure, the movable jaw does not warp up when clamping the workpiece, and the positioning reference surface position of the flat-nose pliers can be arbitrarily changed according to the needs of clamping the workpiece on the machine tool. The present invention has the advantages of sophisticated structure, strong workpiece clamping force, precise positioning, high workpiece processing accuracy, safety and reliability, fast clamping speed, high work efficiency, simple manufacturing, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of the present invention.

[0041] Figure 2 yes Figure 1 sectional view of .

[0042] Figure 3 It is a schematic diagram of the internal structure of the movable jaws of the present invention.

[0043] Figure 4 It is a schematic diagram of the structure of the clamping screw, the clamping nut and the hook pin.

[0044] Figure 5 yes Figure 1 Schematic diagram of the locally enlarged structure of A in the middle.

[0045] Figure 6 It is a structural schematic diagram of the movable jaw of the present invention when it is upright.

[0046] Figure 7 It is a structural schematic diagram of the hook pin of the present invention.

[0047] Figure 8 It is a structural schematic diagram of the movable jaws of the present invention when installed sideways.

[0048] Fig. 9 This is a second structural schematic diagram of the movable jaws when the present invention is installed sideways.

[0049] Fig.10 It is a third structural schematic diagram of the movable jaws when the present invention is installed sideways.

[0050] Fig.11 It is a structural schematic diagram of the indicating device in the present invention.

[0051] Fig.12 It is a schematic diagram of the structure of the through hole on the outer side wall of the support frame of the present invention.

[0052] Fig.13 It is a structural schematic diagram of the side-standing positioning reference surface of the present invention.

[0053] Reference numerals: base 1, support frame 2, slide rail 3, fixed jaw 4, movable jaw 5, clamping nut 6, clamping screw 7, support arm 8, hook pin connector 9, hook pin 10, front vertical surface 12, rear vertical surface 13, left vertical surface 14, right vertical surface 15, horizontal bottom surface 16, upper cover 17, hook pin connector movable through groove 18, screw movable through groove 19, walking positioning track 20, clamping positioning slot 21, arc surface 22, spherical top holding surface 23 , handle section 24, screw return sleeve 25, reset rod 26, reset spring 27, block 28, reset rod socket 29, square mounting hole 30, tension spring 31, positioning pin 32, indicator rod 34, stop platform 36, top spring 37, front connecting block 38, rear connecting block 39, square hole 40, limit screw 41, locking piece 42, support pad or support column 44, rear clamping panel 47, front clamping panel 48, groove 49, hook plate 50, set screw 51. DETAILED DESCRIPTION

[0054] The present invention is described below in conjunction with the accompanying drawings and embodiments.

[0055] As attached Figure 1 , as shown, a quick clamping flat-nose pliers comprises a base 1, a support frame 2, a slide rail 3, a fixed jaw 4, a movable jaw 5, a clamping nut 6, and a clamping screw 7. Two parallel support frames 2 are fixed on the upper end surface of the base 1, a slide rail 3 is fixed on the upper end of the support frame 2, a clamping screw 7 is arranged between the support frames 2, one end of the slide rail 3 is vertically fixedly connected to the fixed jaw 4, and a movable jaw 5 is slidably connected to the slide rail 3. The pliers are characterized in that they also include a support arm 8, a hook pin connector 9, a hook pin 10 and a screw resetting device.

[0056] The movable jaw body is composed of a front vertical surface 12, a rear vertical surface 13, a left vertical surface 14, a right vertical surface 15, a horizontal bottom surface 16 and an upper cover 17. The front end of the horizontal bottom surface 16 is vertically fixedly connected to the front vertical surface 12, the rear end is vertically fixedly connected to the rear vertical surface 13, the left end is vertically fixedly connected to the left vertical surface 14, and the right end is vertically fixedly connected to the right vertical surface 15. The left sides of the front vertical surface 12 and the rear vertical surface 13 are respectively vertically fixedly connected to the left vertical surface 14, and the right sides are respectively vertically fixedly connected to the right vertical surface 15. The periphery of the lower end of the upper cover 17 is fixedly connected to the front vertical surface 12, the rear vertical surface 13, the left vertical surface 14, and the right vertical surface 15 by screws, so that a driving cavity is formed in the movable jaw 5 body. The center of the horizontal bottom surface 16 is provided with a movable through groove 18 of a hook pin connector, and the lower end surface is provided with a slideway matched with a slide rail. The upper end surface of the rear vertical surface 13 is provided with a screw movable through groove 19, and the screw movable through groove 19 is vertically arranged.

[0057] The inner side walls of the two parallel slide rails 3 are symmetrically provided with travel positioning rails 20, and the lower end surfaces of the travel positioning rails 20 are provided with clamping positioning slots 21 in a linear array along the moving direction of the slide rails 3, and the movable jaws 5 are clamped and positioned through the clamping positioning slots 21.

[0058] The clamping nut 6 is arranged in the driving cavity of the movable jaw 5, and a threaded through hole is arranged horizontally in the center of the clamping nut 6. Both sides of the clamping nut 6 extend outward to form a support arm 8, and the lower end extends vertically downward and then extends forward to deviate from the perpendicular line of the axis of the clamping nut 6 to form a " "-shaped hook pin connector 9, the lower end of the hook pin connector 9 is provided with a hook pin insertion hole, the middle part of the hook pin is fixedly plugged with the hook pin insertion hole by a locking screw, and the two ends are axially extended into cylindrical sections and contact the clamping positioning groove through the side wall of the cylindrical section, and the lower end of the support arm 8 is in conflict with the horizontal bottom surface 16 of the movable jaw, so as to facilitate the clamping screw to be constrained and supported by the support arms on both sides of the clamping nut, the screw reset device and the screw movable through groove,

[0059] The clamping screw 7 is made of a spherical top holding surface 23 at the front end, a threaded moving section, a cylindrical section, and a handle section 24 coaxially and integrally. After the cylindrical section of the clamping screw 7 passes through the screw movable groove and is threadedly connected to the threaded through hole in the center of the clamping nut through the threaded moving section, the spherical top holding surface at the front end of the clamping screw 7 conflicts with the front vertical surface of the movable jaw. The clamping screw 7 is connected to the horizontal bottom surface of the movable jaw through a screw reset device to facilitate clamping and positioning of the movable jaw.

[0060] The movable jaw is moved along the slide rail to further apply clamping force to the workpiece, so that the workpiece is accurately clamped by the fixed jaw and the movable jaw. When the clamping screw is rotated, the clamping screw moves relative to the clamping nut, and the spherical top holding surface at the front end of the clamping screw pushes the movable jaw to move along the slide rail, further applying clamping force to the workpiece, so that the workpiece is accurately clamped by the fixed jaw and the movable jaw. When the machine tool vibrates, the flat-nose pliers are clamped by the clamping nut. The hook pin at the lower end of the nut limits the position of the movable jaw, and the support arms on both sides of the clamping nut press down the horizontal bottom surface of the movable jaw, so that the horizontal bottom surface of the movable jaw and the slide rail generate resistance and are fixed on the slide rail. At the same time, the clamping screw at the upper end of the clamping nut directly applies a forward tightening force to the front vertical surface of the movable jaw, so that the movable jaw tilts forward with the hook pin as the center of the circle, and then the clamping surface of the front vertical surface generates a clamping force to press down the workpiece, which solves the technical problem of "warping up" and loosening of the clamping surface of the movable jaw during the clamping process due to the lack of external force constraint on the clamping surface of the movable jaw; when the jaws are released after the workpiece is processed, the operator only needs to rotate the clamping screw in the opposite direction to quickly release and take out the processed workpiece, and then place the workpiece to be processed on the clamping surfaces of the fixed jaw and the movable jaw, and rotate the clamping screw forward again to quickly clamp it, and repeat this process, which greatly improves the working speed, thereby ensuring the precise positioning of the workpiece and high-precision processing.

[0061] As attached Figure 2 As shown, the screw reset device of the present invention includes a screw return sleeve 25, a reset rod 26, a reset spring 27 and a stop block 28. A reset rod insertion hole 29 is provided on the horizontal bottom surface 16. The screw return sleeve 25 is movably sleeved on the clamping screw 7. The lower end of the screw return sleeve 25 is fixedly connected to the reset rod 26. After the reset rod 26 passes through the reset rod insertion hole 29 and the reset spring 27 in sequence, its lower end is fixedly connected to the stop block 28. The upper end of the reset spring 27 is in conflict with the horizontal bottom surface 16 of the movable jaw 5, and the lower end is in conflict with the stop block 28, so as to facilitate the control of the clamping screw 7 in the screw movable through groove 19 by the reset spring 27, ensure the horizontal tightening of the clamping screw 7 against the front vertical surface 12 of the movable jaw 5, and further improve the processing accuracy of the workpiece.

[0062] As attached Figure 1 , Figure 5As shown, the present invention can mirror-image-provide a hook pin locking device between the clamping nut 6 of the movable jaw 5 on both sides of the clamping screw 7 and the rear vertical surface 13, which includes a tension spring 31 and a positioning pin 32. One end of the tension spring 31 conflicts with the positioning groove provided on the side wall of the support arm 8, and the other end is fixedly sleeved on the positioning pin 32. The positioning pin 32 is fixedly connected to the rear vertical surface 13. When the hook pin 10 at the lower end of the clamping nut 6 is fully inserted into the slot 21 at the position under the action of the tension spring 31, the axis line of the clamping nut 6 is parallel to the horizontal bottom surface 16, and the clamping nut 6 is maintained in the locked state under the joint action of the tension spring 31 and the screw reset device, so as to prevent the hook pin 10 from not fully entering the slot 21 to form false clamping and cause accidents.

[0063] As attached Figure 4 As shown, the bottom surface of the support arm 8 of the present invention transitions in an arc shape from the front end to the rear end to form an arc surface 22, and the arc surfaces of the support arms 8 on the left and right sides are on the same cylindrical surface, and the axis line of the arc surface 22 is parallel to the axis line of the hook pin, so as to ensure that when the clamping screw lifts the clamping nut, the bottom surfaces of the support arms 8 on both sides of the clamping nut are always in line contact with the horizontal bottom surface through the arc surface, which not only ensures the flatness of the horizontal bottom surface, but also ensures the surface contact between the hook pin and the slot and the accuracy of the slot, and ensures the smooth movement of the movable jaws.

[0064] The present invention can be provided with an indicator device on the movable jaw 5, and the indicator device includes an indicator rod 34', one end of which passes through the movable through slot of the screw and extends out of the indicator rod throughhole, so that the moving distance of the movable jaw can be observed by changing the extension margin of the indicator rod, so that the workpiece can be safely and stably clamped on the flat-nose pliers by the fixed jaws and the movable jaws.

[0065] As attached Fig.11 As shown, the present invention further provides an indicator rod through hole on the rear vertical surface 13 of the movable jaw 5, one end of the indicator rod 34' passes through the indicator rod through hole and extends out of the indicator rod through hole, and the other end is fixed to the clamping nut 6 through a pin. When the clamping nut 6 is positioned in a certain slot 21 on the travel positioning track 20 by the hook pin 10 at the lower end, the clamping screw 7 is rotated, and the clamping screw 7 pushes the movable jaw body forward along the slide rail 3. The operator can see the adjustable clamping margin of the movable jaw by the change in the extended length of the indicator rod 34', so that the workpiece is safely and stably clamped on the flat-nose pliers by the fixed jaws and the movable jaws.

[0066] As attached Figure 3As shown, the indicating device of the present invention can also be composed of a baffle 36, an indicating rod 34 and a top spring 37. The indicating rod 34 is movably inserted in the indicating rod through hole provided on the rear vertical surface, one end of which extends out of the rear vertical surface, and the other end is fixedly connected to the baffle 36. A top spring 37 is sleeved on the indicating rod 34, one end of which contacts the baffle 36, and the other end contacts the rear vertical surface 13. Under the tension of the top spring 37, the baffle 36 is always in conflict with the clamping nut 6. When the clamping screw 7 pushes the movable jaw 5 forward along the slide rail 3, the indicating rod 34 always moves with the clamping nut 6 under the tension of the top spring 37. The operator can see the adjustable clamping margin of the movable jaw by the change in the extending length of the indicating rod 34, so that the workpiece can be quickly and stably clamped on the flat-nose pliers by the fixed jaws and the movable jaws.

[0067] As attached Figure 2 As shown, the present invention can be provided with a front connecting block 38 at the front end of the slide rail 3, and a rear connecting block 39 at the rear end. The front ends of the two parallel slide rails 3 are fixedly connected via the front connecting block 38, and the rear ends are fixedly connected via the rear connecting block 39, so as to prevent the two parallel slide rails from deforming outward at both ends during long-term use. The front connecting block and the rear connecting block are respectively formed with the support frame and the base with square holes 40 that can be conveniently lifted by hand, which not only ensures the parallelism of the slide rails, but also allows the operator to quickly lift the flat-nosed pliers through the square holes at the front and rear ends of the flat-nosed pliers, thereby achieving the effect of convenient movement.

[0068] As attached Figure 6 As shown, the present invention can fix a limit screw 41 at the lower end of the horizontal bottom surface 16 of the movable jaw 5, and the limit screw 41 is located at the rear of the screw reset device to facilitate controlling the misoperation of the movable jaw 5 during the backward movement process, thereby preventing the screw reset device from colliding with the connecting surface and making the clamping screw unusable.

[0069] As attached Figure 7 As shown, the hook pin 10 of the present invention is coaxially integrated with a thick cylindrical section in the middle and thin cylindrical sections of the same diameter at both ends of the thick cylindrical section to ensure that the hook pin can withstand a larger load when engaged with the slot, ensure the concentricity of the hook pin, and avoid damage to the smoothness of the slot surface due to deformation of the hook pin.

[0070] As attached Figure 6 , 8As shown in , 9, the front end face of the fixed jaw 4 of the present invention is parallel to the clamping face of the fixed jaw, and perpendicular to the upper end face of the slide rail, so that the front end face of the fixed jaw is used as a positioning reference face when it is installed upright. A fixing hole is provided on the front end face of the fixed jaw, and a locking piece 42 is provided on the movable jaw. The locking piece 42 is composed of a limit rod and a pin, and pins are vertically fixed at both ends of the reset rod. A locking piece socket 43 is provided on the rear vertical face of the movable jaw. When the flat-mouth pliers is installed upright, after the limit rod bypasses the clamping screw, the two pins are inserted into the locking piece socket 43 on the rear vertical face, or the two pins are inserted into the lower end of the horizontal bottom face of the movable jaw, and the clamping screw is limited in the movable through groove of the screw, thereby ensuring the safe use of the flat-mouth pliers in the upright installation mode.

[0071] As attached Fig.10 As shown, the locking member 42 of the present invention can also bypass the clamping screw 7, and the pins at both ends are inserted into the bottom end of the horizontal bottom surface, ensuring the safe use of the flat-nose pliers in an upright installation mode.

[0072] The limiting rod of the locking member of the present invention can be in the shape of a straight rod, an arc, or a U shape.

[0073] As attached Fig.12 , Fig.13 As shown, the outer side walls of the support frames at the lower ends of the two slide rails in the present invention are parallel to each other and respectively perpendicular to the upper planes of the slide rails, the two side surfaces of the base are parallel to each other and respectively perpendicular to the upper planes of the slide rails, and a plurality of through holes 45 are respectively provided on the outer side walls of the two support frames, the through holes can be through holes of the same diameter or through holes of different diameters, the through holes can be cylindrical holes or threaded holes, or the through holes can be cylindrical holes and threaded holes arranged alternately, and support pads or support columns 44 are provided on the outer side walls of the two support frames for convenient workpiece processing or loading and unloading, the support pads or support columns are fixed to the side walls of the slide rails through the through holes by connecting screws, so that the outer end faces of the fixed support pads or support columns and the side faces of the base are on the same positioning reference plane, and the outer end faces of the support pads or support columns and the side faces of the base are used as side positioning reference surfaces when the side is installed, thereby ensuring the stable support of the flat-nose pliers when the side faces are used as the installation positioning reference surfaces.

[0074] The lower end of the fixed jaw of the present invention is fixedly connected to the slide rail via a fastening screw or a pin, so as to solve the technical problems in the prior art that when the fixed jaw and the base are integrated into an integral structure, the manufacturing of the clamping surface is difficult and costly, and there are safety hazards especially during grinding (not shown in the figure).

[0075] As attached Figure 1 , 12As shown in FIG. 13 , the present invention can symmetrically provide a plurality of threaded holes 46 on the left and right sides of the fixed jaw for connecting and installing functional components that can eliminate the sixth degree of freedom.

[0076] As attached Figure 1 , 12 As shown in Figures 13 and 14, the present invention can fix a rear clamping panel 47 on the clamping surface of the fixed jaw, and the lower end of the rear clamping panel 47 is fixedly connected to the slide rail 1, and a front clamping panel 48 is fixed on the front vertical surface of the movable jaw, and the lower end of the front clamping panel 48 is matched with the clearance of the slide rail, and the clearance between the front clamping panel 48 and the slide rail is smaller than the thickness of the chips, so as to prevent the chips from entering the clearance between the clamping panel and the slide rail and scratching the upper end surface of the slide rail, and the slideway is composed of a groove 49, a hook plate 50 and a set screw 51 provided at the lower end of the horizontal bottom surface, and after the groove is matched with the slide rail and slidably engaged, the lower end is connected to the slide rail through the hook plate. The lower end surface of the rail is in contact with each other and slidably connected, the hook plate is fixedly connected to the lower end of the horizontal bottom surface by a set screw, and support through holes are respectively provided on the left and right sides of the front upper end of the hook plate. A supporting pad 52 is provided between the hook plate and the clamping panel, and the lower end of the supporting pad 52 is plugged into the supporting through hole, and the upper end is in contact with the front clamping panel for support, so as to make it easier to process the clamping surface of the movable jaw. At the same time, it can also avoid supporting the clamping panel through the supporting pad when the workpiece is slightly knocked perpendicular to the upper end surface of the slide rail, thereby ensuring the stability of the clamping panel and making it easier to make the clamping surface of the movable jaw.

[0077] As attached Figure 1 , 2 As shown, the present invention can provide a square mounting hole 30 on the upper plane at the rear of the slide rail, and the width of the square mounting hole is greater than the spacing of the slide rails, so as to facilitate the rapid and accurate installation of the assembled hook pin through the square mounting hole in the clamping positioning slot below the slide rail.

[0078] As attached Figure 2 As shown, the present invention can also be provided with two front hidden through holes 53 and rear hidden through holes 54 on the lower bottom surface of the base for front and rear installation of quick clamping flat-nose pliers, the front hidden through hole 53 is located below the fixed jaws, and the rear hidden through hole 54 is located below the square installation hole, so as to achieve the effect of being used on a narrow work surface.

[0079] As attached Figure 2 As shown, the fixed jaw of the present invention is provided with a tool through hole 55 which is coaxial with the front hidden through hole 53, so that a tool can be conveniently and quickly passed through the tool through hole to screw a screw into the front hidden through hole 53, thereby fixing the base 53 on a narrow work surface, thereby achieving the effect of being usable on a narrow work surface.

[0080] As attached Figure 2As shown, an iron filings outlet is provided on the base below the slide rail of the present invention to achieve the effect of quickly removing the iron filings.

[0081] The upper end surface of the slide rail and the bottom surface of the base of the present invention are respectively subjected to quenching treatment to ensure the flatness of the upper end surface of the slide rail and the base during long-term use and improve the accuracy of workpiece clamping.

[0082] Embodiment 1: In the process of clamping a square workpiece according to the present invention, when workpieces of different specifications need to be clamped and the distance between the movable jaw and the fixed jaw needs to be adjusted over a large distance, the operator holds the handle section at one end of the clamping screw, lifts the clamping screw, so that the clamping screw drives the hook pin to leave the slot, and then pushes the movable jaw, which quickly moves along the slide rail to one side of the workpiece, pushes the workpiece against the clamping surface of the fixed jaw through the clamping surface of the movable jaw, and then presses down and loosens the clamping screw, and the clamping nut rotates smoothly with the arc surface of the bottom surface of the support arm in line contact with the horizontal bottom surface. The cam is then rotated to return the clamping screw to its original position in the movable groove of the screw under the action of the screw reset device. At the same time, the clamping nut is tightly tightened in the vertical direction backward under the tension of the tension spring and the tension of the screw reset spring, so that the hook pin fixed at the lower end of the hook pin connector at the lower end of the clamping nut is tightly hooked into the slot at that position, firmly positioning the movable jaw on the slide rail at that position. At this time, the workpiece is in a rough clamping state. Then the clamping screw is rotated, the clamping screw moves relative to the clamping nut, and the spherical top holding surface at the front end of the clamping screw pushes the movable jaw along the The slide rail moves, further applying a clamping force to the workpiece, so that the workpiece is accurately clamped by the fixed jaw and the movable jaw; when the machine tool cuts the workpiece, the flat-nose pliers limit the position of the movable jaw through the hook pin at the lower end of the clamping nut, and the support arms on both sides of the clamping nut press down the horizontal bottom surface of the movable jaw, so that the horizontal bottom surface of the movable jaw and the upper end surface of the slide rail produce resistance and are tightly fixed on the slide rail, and then, the clamping screw at the upper end of the clamping nut applies a forward tightening force to the front vertical surface of the movable jaw, so that the movable jaw tilts forward with the hook pin as the center of the circle, and then The clamping surface of the front vertical surface generates a clamping force to press the workpiece downward, solving the technical problem of "warping up" and loosening of the clamping surface of the movable jaw during the clamping process due to the lack of external force constraint on the clamping surface of the movable jaw. When the jaws are released after the workpiece is processed, the operator only needs to rotate the clamping screw in the reverse direction to quickly release and remove the processed workpiece, and then place the workpiece to be processed on the clamping surfaces of the fixed jaw and the movable jaw, and then rotate the clamping screw in the forward direction again to quickly clamp it. This process is repeated, which greatly improves the working speed, thereby ensuring the precise positioning of the workpiece and high-precision processing.

[0083] When the workpiece is clamped on the machine tool with a flat-nose pliers, the front end surface of the fixed jaw of the flat-nose pliers can be used as a positioning reference surface and quickly positioned through a pad block, and the base is fixed on the vertical surface of the workbench. When clamping the workpiece, the operator holds the handle section at one end of the clamping screw and bends the clamping screw outward, so that the clamping screw drives the hook pin to leave the clamping groove, and then, under the action of the gravity of the movable jaw, it quickly moves along the slide rail to the side of the workpiece, so that the movable jaw presses the workpiece against the clamping surface of the fixed jaw and the movable jaw, and then pushes the clamping screw into the movable through groove of the screw, and the hook pin tightly rests against the clamping groove under the action of the tension spring. At the same time, the clamping screw is reset to the movable through groove of the screw under the action of the screw reset device, and the movable jaw is fixed on the slide rail at this position. At this time, the workpiece is in a rough clamping state, and then the clamping screw is rotated, the clamping screw moves relative to the clamping nut, and the spherical top holding surface at the front end of the clamping screw pushes the movable jaw to move along the slide rail. During the movement of the clamping screw, the operator can see the moving distance of the movable jaw by observing the change in the extended length of the indicator rod, so that the workpiece is clamped on the flat-nose pliers safely, quickly and stably by the fixed jaw and the movable jaw. After clamping is completed, in order to ensure the safety and reliability of upright clamping, the locking piece is passed around the clamping screw, the pins at both ends are inserted into the locking piece sockets, and the clamping screw is fixed in the movable through slot of the screw, so that the flat-nose pliers can be safely clamped in the upright installation mode, and then the machine tool is driven to start cutting the surface of the clamped workpiece to be processed. After the workpiece is processed, when the movable jaw is released, the operator does not need to remove the locking piece, but only needs to rotate the clamping screw in the opposite direction. The clamping screw drives the movable jaw to move up along the slide rail, so that the processed workpiece can be quickly released and removed, and then the workpiece to be processed is placed on the clamping surface of the fixed jaw and the movable jaw, and the clamping screw is rotated forward again. The cam is then retracted to allow the workpiece to be clamped in place and the workpiece to be retracted, thereby releasing the clamping force which allows the workpiece to be retracted and re-engaged in the workpiece.

[0084] Embodiment 3: When a workpiece is clamped on a machine tool by using a flat-nose pliers to stand sideways, the support column can be fixed to the side wall of the slide rail via connecting screws as needed. The outer end face of the fixed support column and the side face of the base are on the same positioning reference plane. If it is necessary to increase the adsorption area of ​​the flat-nose pliers and the magnetic template of the workbench during side-mounting, the support column can be changed into a support pad and fixed to the side wall of the slide rail to ensure that the flat-nose pliers can be safely and stably positioned with the side face as the positioning surface and be prepared for adsorption on the magnetic template. Then, a tool is used to screw the screw into the front hidden through hole through the tool perforation and then fix it with the vertical surface of the workbench through the thread. Then, the screw is screwed into the rear hidden through hole and then fixed with the vertical surface of the workbench through the thread. The flat-nose pliers is firmly fixed on the vertical surface of the workbench. The structure is compact, occupies a small area, and the side-mounted clamping is safe and reliable. It is most suitable for use on narrow work surfaces. When clamping a workpiece, the operator holds the handle section at one end of the clamping screw and bends the clamping screw outward, so that the clamping screw drives the hook pin to leave the slot, and the clamping screw pushes the movable jaw to quickly move along the slide rail to the side of the workpiece, so that the movable jaw presses the workpiece between the clamping surfaces of the fixed jaw and the movable jaw, and the hook pin is tightly pressed against the slot under the tension of the tension spring and the tension of the reset spring in the screw reset device. At the same time, the clamping screw returns to the movable through slot of the screw, fixing the movable jaw on the slide rail at this position. At this time, the workpiece is in a rough clamping state, and then the operator can see the moving distance and clamping margin of the movable jaw by observing the change in the extended length of the indicator rod, so that the workpiece is clamped safely, quickly and stably on the flat-nose pliers by the fixed jaws and the movable jaws. After clamping is completed, in order to ensure the safety and reliability of side-standing clamping, the locking piece is passed around the clamping screw, and the pins at both ends are inserted into the locking piece sockets on the horizontal bottom surface, and the clamping screw is fixed in the movable through groove of the screw, so that the flat-nose pliers can be safely clamped in the side-standing installation mode, and then the machine tool is driven. , start cutting the surface of the clamped workpiece to be processed. After the workpiece is processed, when the movable jaw is loosened, the operator does not need to take out the locking piece, but only needs to rotate the clamping screw in the opposite direction, and the clamping screw drives the movable jaw to move up along the slide rail, so as to quickly loosen and take out the processed workpiece, and then place the workpiece to be processed on the clamping surface of the fixed jaw and the movable jaw, and rotate the clamping screw forward again to quickly clamp it, and so on and so forth, which greatly improves the work efficiency. At the same time, during processing, since the flat-nose pliers clamp the movable jaw with the hook pin at the lower end of the clamping nut, The position of the movable jaw is restricted, and the support arms on both sides of the clamping nut press down the horizontal bottom surface of the movable jaw, so that the horizontal bottom surface of the movable jaw and the slide rail generate resistance and are fixed on the slide rail. At the same time, the clamping screw at the upper end of the clamping nut is rotated and moved to apply a forward clamping force to the front vertical surface of the movable jaw, so that the movable jaw tilts forward with the hook pin as the center of the circle, and then the clamping surface of the front vertical surface generates a clamping force to press down the workpiece, avoiding the defect of "warping" of the workpiece on the movable jaw side, thereby ensuring the precise positioning of the workpiece and high-precision processing.

[0085] Due to the adoption of the above structure, the movable jaw does not warp up when clamping, and the positioning reference surface position of the flat-nose pliers can be arbitrarily changed according to the needs of clamping workpieces on the machine tool. The present invention has the advantages of sophisticated structure, strong workpiece clamping force, precise positioning, high workpiece processing accuracy, safety and reliability, fast clamping speed, high work efficiency, simple manufacturing, etc.

Claims

1. A quick clamping flat-nose pliers, comprising a base, a support frame, a slide rail, a fixed jaw, a movable jaw, a clamping nut, and a clamping screw. The upper end surface of the base is fixed with two parallel support frames, the upper end of the support frame is fixed with a slide rail, a clamping screw is arranged between the support frames, one end of the slide rail is vertically fixedly connected to the fixed jaw, and the movable jaw is slidably connected to the slide rail, characterized in that It also includes a support arm, a hook pin connector, a hook pin and a screw reset device, The main body of the movable jaw is composed of a front vertical surface, a rear vertical surface, a left vertical surface, a right vertical surface, a horizontal bottom surface and an upper cover, the front end of the horizontal bottom surface is vertically fixedly connected to the front vertical surface, the rear end is vertically fixedly connected to the rear vertical surface, the left end is vertically fixedly connected to the left vertical surface, and the right end is vertically fixedly connected to the right vertical surface, the left sides of the front vertical surface and the rear vertical surface are respectively vertically fixedly connected to the left vertical surface, and the right sides are respectively vertically fixedly connected to the right vertical surface, the periphery of the lower end of the upper cover is respectively fixedly connected to the front vertical surface, the rear vertical surface, the left vertical surface and the right vertical surface by screws, so that a driving cavity is formed in the movable jaw body, the center of the horizontal bottom surface is provided with a movable through groove of a hook pin connector, the lower end surface is provided with a slideway matched with a slide rail, the upper end surface of the rear vertical surface is provided with a movable through groove of a lead screw, and the movable through groove of the lead screw is vertically arranged, The inner side walls of the two parallel slide rails are symmetrically provided with travel positioning rails, and the lower end surfaces of the travel positioning rails are provided with clamping positioning slots in a linear array along the moving direction of the slide rails. The clamping nut is arranged in the driving cavity of the movable jaw, a threaded through hole is arranged horizontally in the center of the clamping nut, both sides of the clamping nut extend outward to form a support arm, and the lower end extends vertically downward and then extends forward to deviate from the vertical line of the clamping nut axis to form a " "-shaped hook pin connector, the lower end of the hook pin connector is provided with a hook pin insertion hole, the middle part of the hook pin is fixedly plugged with the hook pin insertion hole by a locking screw, and the two ends are axially extended into cylindrical sections and contact the clamping positioning groove through the side wall of the cylindrical section, and the lower end of the support arm is in conflict with the horizontal bottom surface of the movable jaw, The clamping screw is coaxially integrated with a spherical top holding surface at the front end, a threaded moving section, a cylindrical section, and a handle section. After the cylindrical section of the clamping screw passes through the screw movable groove and is threadedly connected to the threaded through hole in the center of the clamping nut via the threaded moving section, the spherical top holding surface at the front end of the clamping screw conflicts with the front vertical surface of the movable jaw. The clamping screw is connected to the horizontal bottom surface of the movable jaw via a screw reset device. The bottom surface of the support arm transitions from the front end to the rear end in an arc shape to form an arc surface. The arc surfaces of the support arms on the left and right sides are on the same cylindrical surface, and the axis of the arc surface is parallel to the axis of the hook pin. A front connecting block is provided at the front end of the slide rail, and a rear connecting block is provided at the rear end. The front ends of the two parallel slide rails are fixedly connected via the front connecting block, and the rear ends are fixedly connected via the rear connecting block. The front connecting block and the rear connecting block respectively form square holes with the support frame and the base for convenient manual lifting. An indicator device is provided on the movable jaw, and the indicator device includes an indicator rod. An indicator rod through hole is provided on the rear vertical surface of the movable jaw, and one end of the indicator rod passes through the indicator rod through hole and extends out of the indicator rod through hole. A square mounting hole is provided on the upper plane of the rear part of the slide rail, and the width of the square mounting hole is greater than the spacing of the slide rails.

2. A quick clamping flat-nose pliers according to claim 1, characterized in that The screw reset device includes a screw return sleeve, a reset rod, a reset spring and a stop block. A reset rod insertion hole is provided on the horizontal bottom surface. The screw return sleeve is movably sleeved on the clamping screw. The lower end of the screw return sleeve is fixedly connected to the reset rod. After the reset rod passes through the reset rod insertion hole and the reset spring in sequence, the lower end of the reset rod is fixedly connected to the stop block. The upper end of the reset spring contacts the horizontal bottom surface of the movable jaw, and the lower end contacts the stop block.

3. A quick clamping flat-nose pliers according to claim 2, characterized in that A hook pin locking device is mirrored between the clamping nuts of the movable jaws on both sides of the clamping screw and the rear vertical surface, which includes a tension spring and a positioning pin. One end of the tension spring is in conflict with the positioning groove provided on the side wall of the support arm, and the other end is fixedly sleeved on the positioning pin. The positioning pin is fixedly connected to the rear vertical surface.

4. A quick clamping flat-nose pliers according to claim 1, 2 or 3, characterized in that The other end of the indicating rod is fixed on the clamping nut via a pin.

5. A quick clamping flat-nose pliers according to claim 1, 2 or 3, characterized in that The indicating device also includes a stopper and a top spring. The other end of the indicating rod is fixedly connected to the stopper. The indicating rod is sleeved with a top spring. One end of the top spring contacts the stopper, and the other end contacts the rear vertical surface.

6. A quick clamping flat-nose pliers according to claim 1, 2 or 3, characterized in that A limit screw is fixed at the lower end of the horizontal bottom surface of the movable jaw, and the limit screw is located at the rear of the lead screw resetting device.

7. A quick clamping flat-nose pliers according to claim 1, 2 or 3, characterized in that The hook pin is coaxially and integrally composed of a thick cylindrical section in the middle and thin cylindrical sections with the same diameter at both ends of the thick cylindrical section.

8. A quick clamping flat-nose pliers according to claim 7, characterized in that The front end face of the fixed jaw is parallel to the clamping face of the fixed jaw and is perpendicular to the upper end face of the slide rail, so that the front end face of the fixed jaw is used as a positioning reference face when it is installed upright. A fixing hole is provided on the front end face of the fixed jaw, and a locking piece is provided on the movable jaw. The locking piece is composed of a limit rod and a pin. Pins are vertically fixed at both ends of the limit rod. When the flat-mouth pliers are installed upright, after the limit rod bypasses the clamping screw, the two pins are inserted into the lower end of the horizontal bottom face of the movable jaw to limit the clamping screw in the movable through groove of the screw.

9. The quick clamping flat-nose pliers according to claim 7, characterized in that The front end face of the fixed jaw is parallel to the clamping face of the fixed jaw and is perpendicular to the upper end face of the slide rail, so that the front end face of the fixed jaw is used as a positioning reference face when it is installed upright. A fixing hole is provided on the front end face of the fixed jaw, and a locking piece is provided on the movable jaw. The locking piece is composed of a limit rod and a pin. Pins are vertically fixed at both ends of the limit rod, and a locking piece socket is provided on the rear vertical face of the movable jaw. When the flat-mouth pliers is installed upright, the locking piece bypasses the clamping screw, and the pins at both ends are inserted into the locking piece socket to fix the clamping screw in the movable through groove of the screw.

10. A quick clamping flat-nose pliers according to claim 8 or 9, characterized in that The limiting rod of the locking member is in the shape of a straight rod, or in the shape of an arc, or in the shape of a U.

11. A quick clamping flat-nose pliers according to claim 1 or 2 or 3 or 8 or 9, characterized in that The outer side walls of the support frames at the lower ends of the two slide rails are parallel to each other and perpendicular to the upper planes of the slide rails, the two side surfaces of the base are parallel to each other and perpendicular to the upper planes of the slide rails, and a plurality of through holes are provided at intervals on the outer side walls of the two support frames. The outer side walls of the two support frames are provided with support pads or support columns for convenient workpiece processing or loading and unloading, and the support pads or support columns are fixed to the side walls of the slide rails through the through holes by connecting screws, so that the outer end faces of the fixed support pads or support columns are on the same positioning reference plane as the side faces of the base.

12. A quick clamping flat-nose pliers according to claim 11, characterized in that The lower end of the fixed jaw is fixedly connected to the slide rail via a fastening screw or a pin.

13. A quick clamping flat-nose pliers according to claim 1 or 2 or 3 or 8 or 9 or 12, characterized in that The left and right sides of the fixed jaw are symmetrically provided with a plurality of threaded holes for connecting and installing functional parts that can eliminate the sixth degree of freedom.

14. A quick clamping flat-nose pliers according to claim 13, characterized in that A rear clamping panel is fixed on the clamping surface of the fixed jaw, and the lower end of the rear clamping panel is fixedly connected to the slide rail, and a front clamping panel is fixed on the front vertical surface of the movable jaw, and the lower end of the front clamping panel cooperates with the slide rail gap, and the gap between the front clamping panel and the slide rail is smaller than the thickness of the chip, and the slideway is composed of a groove, a hook plate and a fixing screw provided at the lower end of the horizontal bottom surface, and after the groove cooperates and slides with the slide rail, the lower end is slidably connected to the lower end surface of the slide rail through the hook plate, and the hook plate is fixedly connected to the lower end of the horizontal bottom surface through the fixing screw, and supporting through holes are respectively provided on the left and right sides of the front upper end of the hook plate, and a supporting pad is provided between the hook plate and the clamping panel, the lower end of the supporting pad is plugged into the supporting through hole, and the upper end is supported by the front clamping panel.

15. A quick clamping flat-nose pliers according to claim 1 or 2 or 3 or 8 or 9 or 12 or 14, characterized in that The lower bottom surface of the base is provided with two front hidden through holes and rear hidden through holes for front and rear installation of quick clamping flat-nose pliers, the front hidden through hole is located below the fixed jaws, and the rear hidden through hole is located below the square installation hole.

16. A quick clamping flat-nose pliers according to claim 15, characterized in that The fixed jaw is provided with a tool through hole coaxial with the front hidden through hole.

17. A quick clamping flat-nose pliers according to claim 1 or 2 or 3 or 8 or 9 or 12 or 14 or 16, characterized in that An iron scrap outlet is arranged on the base below the slide rail.

18. A quick clamping flat-nose pliers according to claim 17, characterized in that The upper end surface of the slide rail and the bottom surface of the base are quenched respectively.

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