CN212918543U - Clamping tool - Google Patents

Abstract

The utility model provides a centre gripping frock, it includes: the clamping device comprises a base, a first clamping piece, a second clamping piece and a spring; the first clamping piece is movably connected with the base along the direction parallel to the base; the second clamping piece is connected with the base through the spring, and the second clamping piece can move along the direction parallel to the base; the first clamping piece and the second clamping piece are oppositely arranged and used for clamping a workpiece; the second clamping piece comprises a first scale, the base comprises a second scale, and the first scale is parallel to the second scale. So the configuration, through reading first scale and second scale, can learn first holder with the displacement of second holder for the base, and then can convert into the clamping-force value according to hooke's law, conveniently learn real-time clamping-force value from this, supply the operator to adjust and refer to.

Description

Clamping tool

Technical Field

The utility model relates to the technical field of machining, in particular to centre gripping frock.

Background

The flat tongs are common mechanical parts for machining and manual fixation, and common power structures comprise manual, pneumatic, electric, hydraulic and pneumatic linkage. The clamping force can be adjusted by adjusting air pressure, motor torque or hydraulic pressure and the like in pneumatic, electric, hydraulic and gas-liquid linkage, however, the flat tongs with pneumatic, electric, hydraulic and gas-liquid linkage are complex in device and high in cost, so that manual flat tongs are still applied to many occasions. However, the manual flat tongs can only adjust the clamping force by the experience of the user and cannot indicate the clamping force value, which causes inconvenience to many applications.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a centre gripping frock to solve the problem that current flat-nose pliers are difficult to adjust and instruct the clamping-force.

In order to solve the technical problem, the utility model provides a clamping tool, it includes: the clamping device comprises a base, a first clamping piece, a second clamping piece and a spring;

the first clamping piece is movably connected with the base along the direction parallel to the base;

the second clamping piece is connected with the base through the spring, and the second clamping piece can move along the direction parallel to the base; the first clamping piece and the second clamping piece are oppositely arranged and used for clamping a workpiece;

the second clamping piece comprises a first scale, the base comprises a second scale, and the first scale is parallel to the second scale.

Optionally, the clamping tool further comprises a first limiting assembly, and the first limiting assembly is used for limiting the displacement of the first clamping piece relative to the base.

Optionally, the first limiting component comprises: a screw and a first fixing seat; the first fixing seat is fixedly connected with the base, the first fixing seat is provided with a screw hole matched with the screw rod, and the axis of the screw hole is parallel to the base; the screw is in threaded connection with the first fixed seat through the screw hole; the screw rod is connected with the first clamping piece.

Optionally, the screw has an adjusting head on a side of the first fixing seat away from the first clamping member, and the adjusting head is used for being matched with an adjusting tool to transmit a torque from the adjusting tool.

Optionally, the screw is rotatably connected to the first clamping member about its axis, and displacement of the screw along its axis relative to the first clamping member is limited.

Optionally, the clamping tool further comprises a guide assembly, and the guide assembly is used for limiting the displacement of the second clamping piece along the direction forming an angle with the base.

Optionally, the guide assembly includes a guide rod and a second fixing seat; the second fixed seat is fixedly connected with the base, the second fixed seat is provided with a guide hole matched with the guide rod, and the axis of the guide hole is parallel to the base; the guide rod penetrates through the guide hole and is connected with the second clamping piece.

Optionally, the spring is sleeved outside the guide rod.

Optionally, one end of the guide rod, which is far away from the second clamping piece, is provided with a radial hole, the clamping tool further comprises a limiting clamp, the limiting clamp is arranged in the radial hole in a penetrating mode, and the limiting clamp is used for abutting against the second fixing seat so as to limit the displacement of the guide rod towards the direction of the second clamping piece.

Optionally, the first clamping member and the second clamping member are coaxially disposed.

To sum up, the utility model provides a centre gripping frock includes: the clamping device comprises a base, a first clamping piece, a second clamping piece and a spring; the first clamping piece is movably connected with the base along the direction parallel to the base; the second clamping piece is connected with the base through the spring, and the second clamping piece can move along the direction parallel to the base; the first clamping piece and the second clamping piece are oppositely arranged and used for clamping a workpiece; the second clamping piece comprises a first scale, the base comprises a second scale, and the first scale is parallel to the second scale. So the configuration, through reading first scale and second scale, can learn first holder with the displacement of second holder for the base, and then can convert into the clamping-force value according to hooke's law, conveniently learn real-time clamping-force value from this, supply the operator to adjust and refer to.

Drawings

Those skilled in the art will appreciate that the drawings are provided for a better understanding of the invention and do not constitute any limitation on the scope of the invention. Wherein:

fig. 1 is a schematic view of a clamping tool according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating the use of the clamping tool according to an embodiment of the present invention.

In the drawings:

10-a base; 11-a second scale; 20-a first clamp; 30-a second clamp; 31-first scale; 40-a spring; 50-a first stop assembly; 51-screw rod; 511-boss; 512-T bolt; 52-a first fixed seat; 53-an adjustment head; 60-a guide assembly; 61-a guide bar; 62-a second fixed seat; 63-radial holes; 90-a workpiece; 91-a first sample section; 92-coating; 93-adhesive sheet; 94-second sample section.

Detailed Description

To make the objects, advantages and features of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in simplified form and are not to scale, but rather are provided for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this application, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a", "an" and "the" are generally employed in a sense including "at least one", the terms "at least two" and "two or more" are generally employed in a sense including "two or more", and moreover, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or imply that there is a number of technical features being indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or at least two of that feature, with "one end" and "the other end" typically referring to the corresponding two parts, including not only the endpoints, unless the content clearly dictates otherwise.

The core idea of the utility model is to provide a centre gripping frock to solve the problem that current flat-nose pliers are difficult to adjust and instruct the clamping-force.

The following description refers to the accompanying drawings.

Please refer to fig. 1 and fig. 2, wherein fig. 1 is a schematic view of a clamping tool according to an embodiment of the present invention; fig. 2 is a schematic view illustrating the use of the clamping tool according to an embodiment of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a clamping tool, which includes: the base 10, the first clamping piece 20, the second clamping piece 30 and the spring 40; the first clamping piece 20 is movably connected with the base 10 along the direction parallel to the base 10; the second clamping member 30 is connected with the base 10 through the spring 40, and the second clamping member 30 is movable in a direction parallel to the base 10; the first clamping piece 20 and the second clamping piece 30 are oppositely arranged and used for clamping a workpiece 90; the second clamping member 30 comprises a first scale 31, the base 10 comprises a second scale 11, and the first scale 31 is parallel to the second scale 11. So configured, by reading the first scale 31 and the second scale 11, the displacement of the first clamping member 20 and the second clamping member 30 relative to the base 10 can be known, and then the displacement can be converted into a clamping force value according to hooke's law, so that a real-time clamping force value can be conveniently known for an operator to adjust and refer to. Specifically, for a specific spring 40 having a certain stiffness coefficient, the deformation of the spring 40 and the stress applied thereto are linear according to hooke's law, so that the stress of the spring 40, i.e. the clamping force value applied to the workpiece 90 clamped by the first clamping member 20 and the second clamping member 30, can be derived from the deformation of the spring 40 through the first scale 31 and the second scale 11. It should be noted that the clamping force value herein refers to a pair of forces applied by the first clamping member 20 and the second clamping member 30 to the workpiece 90 together, and does not refer to a pair of forces applied by the first clamping member 20 or the second clamping member 30 to the workpiece 90 alone. Specifically, referring to fig. 2, the left end of the workpiece 90 is clamped by the first clamping member 20, the right end of the workpiece 90 is clamped by the second clamping member 30, when the first clamping member 20 and the second clamping member 30 have a tendency to move relatively (relatively close to or away from each other), the first clamping member 20 and the second clamping member 30 together apply a pair of acting forces (pressure or pulling force) to the workpiece 90, and the magnitude of the pair of acting forces is the clamping force value. It should be noted that, a person skilled in the art can use the prior art to realize reliable clamping of the workpiece by the first clamping member 20 and the second clamping member 30, such as by friction, glue joint, a snap structure or a positioning bolt, which are various common forms, and the present invention is not described herein.

In an exemplary embodiment, the base 10 is a plate-like member, which is preferably arranged in a horizontal direction. The upper surface of the base 10 is a smooth plane, and the first and second clamping members 20 and 30 can slide on the upper surface of the base 10 with less resistance. The first scale 31 is marked on a side wall of the second clamping member 30 near one side of the base 10, and the second scale 11 is marked on a side wall of the base 10 near the upper surface. In some embodiments, the graduations of the first graduations 31 and the second graduations 11 each comprise a plurality of graduations, and the spacing between adjacent graduations is preferably the same or proportional, for example, each is imprinted at 1 mm-to-one intervals. In yet other embodiments, one of the first scale 31 and the second scale 11 comprises a single mark line, and the other comprises a plurality of scale lines, and the relative position relationship between the two is determined and read by the position of the single mark line on the plurality of scale lines. When the first clamping member 20 and the second clamping member 30 clamp a workpiece 90 and no external force is applied, the relative positions of the first scale 31 and the second scale 11 are at the initial position, which defines the relative reading of the first scale 31 and the second scale 11 as zero position. Acting force is applied to the first clamping piece 20, the acting force is transmitted to the second clamping piece 30 through the workpiece 90 by the first clamping piece 20 and then transmitted to the spring 40, so that the spring 40 deforms, the deformation amount can be obtained through the difference value between the relative reading of the first scale 31 and the second scale 11 and the zero position, and then the value of the acting force can be obtained through the conversion of the stiffness coefficient of the spring 40. The stiffness of the spring 40 may be obtained by calibration, or a spring 40 with a known stiffness may be selected. The clamping force value is obtained because the value of the applied force is numerically equal to the clamping force experienced by the workpiece 90. Preferably, the spring 40 is detachable and replaceable, i.e. the spring 40 with different stiffness coefficients can be replaced to achieve clamping with different force values. Optionally, the first clamping member 20 and the second clamping member 30 are also detachable and replaceable, that is, the clamping members with different shapes can be replaced to clamp samples with different shapes.

Preferably, the clamping tool further comprises a first limiting assembly 50, and the first limiting assembly 50 is used for limiting the displacement of the first clamping member 20 relative to the base 10. In some cases, it is desirable to maintain a constant clamping force on workpiece 90 after applying a force to first clamping member 20. The first stop assembly 50 maintains the clamping force on the workpiece 90 by limiting the displacement of the first clamp 20 relative to the base 10.

In an alternative embodiment, the first stop assembly 50 comprises: a screw 51 and a first fixing seat 52; the first fixing seat 52 is fixedly connected with the base 10, the first fixing seat 52 is provided with a screw hole matched with the screw 51, and the axis of the screw hole is parallel to the base 10; the screw rod 51 is in threaded connection with the first fixed seat 52 through the screw hole; the screw 51 is connected to the first clamping member 20. Optionally, the screw 51 is a trapezoidal screw or a ball screw, and when the screw 51 rotates around its own axis, the screw generates axial displacement relative to the first fixing seat 52 to drive the first clamping member 20 to move, so as to realize loading, holding or unloading of the workpiece 90 under force.

Preferably, an end of the screw 51 remote from the first clamping member 20 has an adjusting head 53, and the adjusting head 53 is adapted to cooperate with an adjusting tool to transmit a torque from the adjusting tool, thereby driving the screw 51 to rotate. The adjusting tool may be an external hexagonal wrench, an internal double offset ring wrench, a screwdriver, or other common tools, and correspondingly, the adjusting head 53 may be an external hexagonal head, an internal hexagonal hole, an internal quincuncial hole, or a cross screw hole. Other mating shapes for the adjustment tool and the adjustment head 53 are possible. In particular, the adjustment head 53 may also be a hand-threaded head (e.g., a quincunx head) that the operator can directly manipulate by hand.

Alternatively, the screw 51 is rotatably connected to the first clamping member 20 around its own axis, and the displacement of the screw 51 along its own axis relative to the first clamping member 20 is limited, i.e. the position of the screw 51 along its own axis relative to the first clamping member 20 is not changed. When the screw 51 is rotated, the first clamp member 20 does not rotate following the screw 51, but moves only in the axial direction following the screw 51. The rotation of the screw 51 needs to be decoupled from the first clamping member 20. In an exemplary embodiment, an end of the first clamping member 20 facing the first fixing base 52 has a through hole, a portion of the screw 51 is loosely inserted into the through hole, and an end of the screw 51 inserted into the through hole has a screw hole for the T-bolt 512 to be screwed into. The screw 51 has a boss 511 on a side of the first fixing seat 52 facing the first clamping member 20, and the boss 511 can abut against the first clamping member 20. The distance between the boss 511 and the wing of the T-bolt 512 is matched with the depth of the through hole of the first clamping member 20 (equal to or slightly greater than the depth of the through hole), so that the boss 511 and the wing of the T-bolt 512 can limit the displacement of the first fixing seat 52 along the axial direction of the screw 51, but do not limit the relative rotation of the two. In other embodiments, the screw 51 may be rotatably connected to the first fixed seat 52 by a flange bearing, a rivet, or other connection means commonly used in the art, and the axial displacement of the two is limited.

Of course, in other embodiments, the first position-limiting component 50 is not limited to a combination of the screw 51 and the screw hole, and may also be a combination of several engaging holes and buckles, when the first clamping member 20 moves relative to the base 10, the buckles may be snapped into and out of the sequentially arranged engaging holes, and when the first clamping member 20 is stationary relative to the base 10, the buckles may be snapped into a certain engaging hole, so as to limit the position of the first clamping member 20 relative to the base 10. The first stop assembly 50 may be suitably configured by those skilled in the art in light of the prior art.

Preferably, the clamping tool further comprises a guide assembly 60, and the guide assembly 60 is used for limiting the displacement of the second clamping member 30 along the direction forming an angle with the base 10, that is, ensuring that the displacement direction of the guide assembly 60 is parallel to the base 10. The guide assembly 60 is used to limit the second clamping member 30 to move only in a direction parallel to the base 10, so as to prevent the second clamping member 30 from being removed by radial deflection under the action of the force from the first clamping member 20.

In an alternative embodiment, the guiding assembly 60 comprises a guiding rod 61 and a second fixing seat 62; the second fixed seat 62 is fixedly connected with the base 10, the second fixed seat 62 is provided with a guide hole matched with the guide rod 61, and the axis of the guide hole is parallel to the base 10; the guide rod 61 is inserted into the guide hole and connected to the second clamping member 30. The cross section of the guide hole is the same as or matched with that of the guide rod 61, for example, the cross sections of the guide hole and the guide rod 61 are both circular, and the cross sections of the guide hole and the guide rod are the same; or the cross section of the guide hole is a regular polygon, the cross section of the guide rod 61 is a circle, and the cross section shapes of the guide hole and the guide rod are matched. Preferably, the guide hole is in clearance fit with the guide rod 61, so that the guide rod 61 can only move along the axial direction of the guide hole, and cannot deviate in the radial direction. In other embodiments, the guide assembly 60 may also be a linear guide component such as a linear slide rail, which is commonly used in the art, but the present invention is not limited thereto.

Optionally, the spring 40 is sleeved outside the guide rod 61. Because the spring 40 is designed to be detachable and replaceable, the two ends of the spring 40 are preferably connected with the second fixing seat 62 and the second clamping member 30 in a manner of abutting against or hooking, and the spring 40 is sleeved outside the guide rod 61 in a manner of being arranged, so that the spring 40 can be prevented from being separated out when being eccentrically pressed.

In some embodiments, one end of the guide rod 61, which is away from the second clamping member 30, is provided with a radial hole 63, and the clamping tool further includes a limiting clip (not shown) that is inserted into the radial hole 63 and is used for abutting against the second fixing seat 62 to limit the displacement of the guide rod 61 in the direction toward the second clamping member 30. The setting of spacing card and radial hole 63 can restrict guide bar 61 and can not remove the break-away guiding hole towards second holder 30 direction, has effectively avoided the centre gripping frock to lose efficacy, avoids overstretching spring 40 and damages spring 40, guarantees that spring 40 can work in linear region. In other embodiments, the position-limiting clamp and the radial hole 63 can be replaced by a nut disposed on the guide rod 61, and the configuration can be performed by those skilled in the art.

Preferably, the first clamping member 20 and the second clamping member 30 are coaxially arranged. Preferably, the axis of the guide rod 61 coincides with the axis of the screw 51, so that the forces of the first clamping member 20 and the second clamping member 30 on the workpiece 90 are kept in a straight line. The columnar sample can be centered on the axis conveniently, and eccentric pressure or tension is avoided.

The following description is made with reference to two specific use cases:

1. tensile and shear testing of coatings

As shown in fig. 2, the workpiece 90 includes a first sample section 91, a coating 92, an adhesive sheet 93, and a second sample section 94, which are connected in sequence. The second clamping member 30 is moved to determine a zero position, the first clamping member 20 clamps the first sample segment 91, the second clamping member 30 clamps the second sample segment 94, the adjusting head 53 is rotated, and the screw 51 is driven to rotate to load a predetermined clamping force value.

2. Examination of clamping force values

Fixing the base 10, clamping the guide rod 61 to exert the calibration force of the determined value, so as to make the second clamping member 30 move, reading the scale values of the first scale 31 and the second scale 11, and calibrating the calibration force and the scale values in a matching way.

A force value sensor is used as a workpiece 90, the first clamping piece 20 and the second clamping piece 30 clamp the force value sensor, the adjusting head 53 is rotated to drive the screw rod 51 to rotate, the force value sensor is loaded to display a preset calibration force value, the scale value is read, and the calibration force and the scale value are calibrated in a matching mode.

To sum up, the utility model provides a centre gripping frock includes: the clamping device comprises a base, a first clamping piece, a second clamping piece and a spring; the first clamping piece is movably connected with the base along the direction parallel to the base; the second clamping piece is connected with the base through the spring, and the second clamping piece can move along the direction parallel to the base; the first clamping piece and the second clamping piece are oppositely arranged and used for clamping a workpiece; the second clamping piece comprises a first scale, the base comprises a second scale, and the first scale is parallel to the second scale. So the configuration, through reading first scale and second scale, can learn first holder with the displacement of second holder for the base, and then can convert into the clamping-force value according to hooke's law, conveniently learn real-time clamping-force value from this, supply the operator to adjust and refer to.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims (10)

1. The utility model provides a centre gripping frock, its characterized in that includes: the clamping device comprises a base, a first clamping piece, a second clamping piece and a spring;

the first clamping piece is movably connected with the base along the direction parallel to the base;

the second clamping piece is connected with the base through the spring, and the second clamping piece can move along the direction parallel to the base; the first clamping piece and the second clamping piece are oppositely arranged and used for clamping a workpiece;

the second clamping piece comprises a first scale, the base comprises a second scale, and the first scale is parallel to the second scale.

2. The clamping tool of claim 1 further comprising a first limiting assembly for limiting displacement of the first clamping member relative to the base.

3. The clamping tool of claim 2, wherein the first limiting assembly comprises: a screw and a first fixing seat; the first fixing seat is fixedly connected with the base, the first fixing seat is provided with a screw hole matched with the screw rod, and the axis of the screw hole is parallel to the base; the screw is in threaded connection with the first fixed seat through the screw hole; the screw rod is connected with the first clamping piece.

4. The clamping tool of claim 3, wherein the screw has an adjusting head on a side of the first fixed seat away from the first clamping member, the adjusting head being adapted to cooperate with an adjusting tool to transmit torque from the adjusting tool.

5. The clamping tool of claim 3 wherein the threaded rod is rotatably connected to the first clamping member about its axis and the threaded rod is limited in its displacement along its axis relative to the first clamping member.

6. The clamping tool of claim 1 further comprising a guide assembly for limiting displacement of the second clamping member in a direction at an angle to the base.

7. The clamping tool according to claim 6, wherein the guide assembly comprises a guide rod and a second fixed seat; the second fixed seat is fixedly connected with the base, the second fixed seat is provided with a guide hole matched with the guide rod, and the axis of the guide hole is parallel to the base; the guide rod penetrates through the guide hole and is connected with the second clamping piece.

8. The clamping tool of claim 7, wherein the spring is sleeved outside the guide rod.

9. The clamping tool according to claim 7, wherein a radial hole is formed in one end, away from the second clamping piece, of the guide rod, the clamping tool further comprises a limiting clamp, the limiting clamp penetrates through the radial hole, and the limiting clamp is abutted against the second fixing seat so as to limit displacement of the guide rod towards the direction of the second clamping piece.

10. The clamping tool of claim 1, wherein the first clamping member is coaxially disposed with the second clamping member.

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