Internal bracing clamp

Abstract

The utility model relates to the technical field of clamps, and particularly discloses an inner tight-supporting clamp which comprises a support, a positioning cylinder, tight-supporting blocks, a connecting rod and a driving mechanism, the positioning cylinder is fixedly arranged on the support in the vertical direction, and the tight-supporting blocks are evenly distributed on the peripheral wall of a positioning column around the axis of the positioning column; one end of the connecting rod is connected to the tight supporting block, the other end of the connecting rod is inserted into an inner cavity of the positioning cylinder, and the connecting rod extends in the radial direction of the positioning cylinder. The driving mechanism is used for synchronously driving the connecting rods to move in the extending direction of the connecting rods. The clamping device has the effect of accurately clamping the workpiece in the shape of a circular truncated cone so as to execute procedures such as boring and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clamps, in particular to an inner supporting clamp. BACKGROUND

[0002] The clamp refers to the device used for fixing the machining object in the mechanical manufacturing process, so that it occupies the correct position to accept the construction or detection, also known as the fixture. In a broad sense, in the process of any process, the device used for quickly, conveniently and safely installing the workpiece can be called the clamp.

[0003] At present, in the machining and manufacturing, the clamping and fixing of the workpiece are mostly used by the three-jaw chuck. However, in the machining, the workpiece cannot be clamped or the clamping precision is not high by using the three-jaw chuck, for example, the workpiece with the circular truncated cone shape is machined by boring and external circle milling. Therefore, a clamp is needed, which can be used in the boring and external circle milling of the workpiece with the circular truncated cone shape when the three-jaw chuck cannot be clamped or the clamping precision is not high, so as to better meet the actual production needs. CONTENT OF THE UTILITY MODEL

[0004] In order to accurately clamp the workpiece with the circular truncated cone shape in order to perform the boring process and the like, the present application provides an inner supporting clamp.

[0005] The inner supporting clamp provided by the present application adopts the following technical scheme:

[0006] An inner supporting clamp comprises a support, a positioning cylinder, a supporting block, a connecting rod and a driving mechanism. The positioning cylinder is fixed on the support in the vertical direction. The supporting blocks are uniformly distributed on the outer peripheral wall of the positioning cylinder around the axis of the positioning cylinder. One end of the connecting rod is connected to the supporting block. The other end of the connecting rod is inserted into the inner cavity of the positioning cylinder. The connecting rod extends in the radial direction of the positioning cylinder. The driving mechanism is used for synchronously driving each connecting rod to move in the extending direction of the connecting rod.

[0007] By adopting the above technical scheme, in use, the workpiece is first sleeved on the outer peripheral wall of the positioning cylinder through the inner hole, and then each connecting rod is driven by the driving mechanism to move in the extending direction of the connecting rod, so as to drive each supporting block to be outwardly supported, thereby realizing the uniform support of the workpiece, improving the machining precision and stability, and having the effect of accurately clamping the workpiece with the circular truncated cone shape in order to perform the boring process and the like.

[0008] Optionally, the driving mechanism comprises a sleeve, a rotating cylinder and a driving assembly. The sleeve is sleeved on each connecting rod. The sleeve is fixedly inserted into the peripheral wall of the positioning cylinder. The sleeve is provided with a rotation limiting block for limiting the rotation of the connecting rod. The rotating cylinder is coaxially and rotatably connected to one end of the sleeve located in the inner cavity of the positioning cylinder. The inner wall of the rotating cylinder is provided with an internal thread. The connecting rod is inserted into the rotating cylinder and is threadedly connected with the internal thread on the rotating cylinder. The driving assembly is used for synchronously driving each rotating cylinder to rotate.

[0009] By adopting the technical scheme, during use, when the driving assembly synchronously drives the rotation of each rotating cylinder, the connecting rod can only move along the extending direction thereof due to the threaded connection between the connecting rod and the internal thread in the rotating cylinder and the limitation of the rotation stopping block, thereby driving the bracing block to move outward or inward to realize the bracing or loosening action, and the structure is relatively simple and convenient to use.

[0010] Optionally, the driving assembly comprises a rotating rod, a driving bevel gear, a driven bevel gear and a driving part, the rotating rod is rotationally connected to the positioning cylinder around the positioning cylinder axis, the driving bevel gear is coaxially connected to the rotating rod, the driven bevel gear is coaxially connected to each rotating cylinder, the driving bevel gear is in mesh with each driven bevel gear, and the driving part is used to drive the rotating rod to rotate.

[0011] By adopting the technical scheme, when it is needed to brace the workpiece, the driving part drives the rotating rod to rotate, the rotating rod drives the driving bevel gear to rotate, the driving bevel gear synchronously drives each rotating cylinder to rotate through the meshing action with each driven bevel gear; the rotation of the rotating cylinder causes the connecting rod in threaded connection therewith to move along the radial direction of the positioning cylinder, thereby driving the bracing block to move outward to realize the bracing of the workpiece; through the transmission action of the bevel gears, the synchronous movement of each connecting rod can be ensured, thereby realizing the uniform bracing effect.

[0012] Optionally, the driving part comprises a worm wheel, a worm and a power piece, the worm wheel is coaxially connected to the rotating rod, the worm is rotationally connected to the support, the worm is in mesh with the worm wheel, and the power piece is used to drive the worm to rotate.

[0013] By adopting the technical scheme, the meshing transmission of the worm wheel and the worm can convert the rotary motion of the power piece into the rotation of the rotating rod, thereby realizing the synchronous driving of each rotating cylinder, driving the connecting rod to move along the extending direction thereof, realizing the synchronous bracing or releasing of the bracing block, and improving the use convenience and working efficiency of the inner bracing clamp; in addition, the worm wheel and worm transmission also have the self-locking function, which can prevent the bracing block from loosening due to external force during use, thereby enhancing the stability of the bracing.

[0014] Optionally, an end of the bracing block away from the positioning cylinder is provided with a pressure bearing block.

[0015] By adopting the technical scheme, the end of the bracing block away from the positioning cylinder is provided with the pressure bearing block, which can effectively improve the support stability of the workpiece, disperse the pressure during the bracing, reduce the deformation of the workpiece, reduce the pressure damage of the bracing block during use, and prolong the service life.

[0016] Optionally, a limiting rod is connected to each of the supporting blocks, and the limiting rod is arranged in the positioning cylinder and is parallel to the connecting rod.

[0017] By using the above technical scheme, the limiting rod connected to each of the supporting blocks can limit the axial movement of the supporting blocks along the positioning cylinder, so that the supporting blocks only move along the extension direction of the connecting rod, thereby improving the stability and reliability of the clamp work and avoiding the problem of deviation or skew of the supporting blocks during the supporting process.

[0018] Optionally, the top of the positioning cylinder is chamfered.

[0019] By using the above technical scheme, the chamfered top of the positioning cylinder can effectively reduce the processing difficulty and play a guiding role during the workpiece sleeving process, thereby avoiding scratching the workpiece and improving the operation convenience.

[0020] In summary, the present application has at least one of the following beneficial technical effects:

[0021] 1. Each of the connecting rods is driven to move along the extension direction thereof by the driving mechanism, thereby driving each of the supporting blocks to outwardly support, so that uniform support of the inner hole of the workpiece can be achieved, the clamping precision is high and the stability is strong, and the workpiece with a circular truncated cone shape can be accurately clamped for performing the boring process and the like;

[0022] 2. The rotating cylinder in the driving mechanism is threadedly connected with the connecting rod, so that the connecting rod can move along the positioning cylinder in the radial direction under the driving of the driving assembly, the uniform support of the inner hole of the workpiece is achieved, and the threaded connection between the rotating cylinder and the connecting rod also makes the movement of the connecting rod more stable and reliable, the movement control ability is stronger, and the load capacity is stronger;

[0023] 3. The cooperation of the worm gear, the worm and the power piece can achieve the functional requirement of driving the rotating rod to rotate by the driving assembly, and the self-locking function of the worm gear and the worm is utilized to prevent the supporting blocks from loosening due to accidental external force during use, thereby enhancing the stability of the supporting blocks. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0026] Figure 2 is a schematic diagram of the cross-sectional structure of the embodiment of the present application;

[0027] Figure 3 is the Figure 2 enlarged structural schematic diagram of part A in the present

[0028] Reference signs: 1, support; 2, positioning cylinder; 21, accommodating groove; 3, bracing block; 31, limiting rod; 32, pressure bearing block; 4, connecting rod; 41, external thread; 42, clamping groove; 5, driving mechanism; 51, sleeve; 511, rotation stopping block; 52, rotating cylinder; 521, internal thread; 53, rotating rod; 54, driving bevel gear; 55, driven bevel gear; 56, worm wheel; 57, worm; 58, power element. DETAILED DESCRIPTION

[0029] The following will be described in detail in combination with the Figures 1-3 The present application is further described in detail.

[0030] The present application discloses an inner bracing clamp. Referring to Figure 1 , the inner bracing clamp comprises a support 1, a positioning cylinder 2, a bracing block 3, a connecting rod 4 and a driving mechanism 5. The positioning cylinder 2 is vertically fixed on the support 1, and the top of the positioning cylinder 2 is chamfered, and a workpiece is directly sleeved on the outer peripheral wall of the positioning cylinder 2 through an inner hole. The bracing block 3 is uniformly distributed on the outer peripheral wall of the positioning column around the axis of the positioning cylinder 2, and in the present application, four bracing blocks 3 are uniformly arranged, and the outer peripheral wall of the positioning cylinder 2 is provided with accommodating grooves 21 corresponding to each bracing block 3, and the bracing block 3 is clamped in the accommodating groove 21. One end of the connecting rod 4 is welded and fixed on the bracing block 3, and the other end of the connecting rod 4 is inserted into the inner cavity of the positioning cylinder 2 from the peripheral wall of the positioning cylinder 2, and the connecting rod 4 extends radially along the positioning cylinder 2. The driving mechanism 5 is used for synchronously driving each connecting rod 4 to move along the extension direction thereof.

[0031] In the use process, the workpiece is sleeved on the outer peripheral wall of the positioning cylinder 2 through the inner hole, and then each connecting rod 4 is synchronously driven by the driving mechanism 5 to move along the extension direction thereof away from the center of the positioning cylinder 2, that is, each bracing block 3 can be synchronously driven to move outward until it abuts against the inner hole wall surface of the workpiece, so that the workpiece is uniformly braced, and through the bracing of the clamp, the workpiece has high clamping precision and strong stability, and has the effect of accurately clamping the workpiece with a circular truncated cone shape to perform boring and other processes.

[0032] Further, in order to improve the stability of the movement of the bracing block 3, a limiting rod 31 is fixedly connected to each bracing block 3, the limiting rod 31 is arranged on the positioning cylinder 2, and the limiting rods 31 on the same bracing block 3 are parallel to the connecting rod 4. The limiting rod 31 connected to each bracing block 3 ensures that the bracing block 3 only moves along the extension direction of the connecting rod 4, thereby improving the stability and reliability of the clamp work, and avoiding the problem of deviation or skew of the bracing block 3 in the bracing process.

[0033] Further, the end of the supporting block 3 away from the positioning cylinder 2 is also provided with a pressure bearing block 32 fixed by bolts, the outer wall surface of the pressure bearing block 32 is arc-shaped, the pressure bearing block 32 can be made of aluminum alloy or titanium alloy, has good wear resistance and pressure bearing capacity, and can replace the supporting block 3 to contact the inner hole wall surface of the workpiece, thereby improving the support stability of the workpiece, dispersing the pressure during the supporting process, reducing the deformation of the workpiece, reducing the pressure damage of the supporting block 3 during use, and prolonging the service life.

[0034] For example, referring to Figures 2-3 The driving mechanism 5 includes a sleeve 51, a rotating cylinder 52, and a driving assembly. The connecting rod 4 is provided with an external thread 41, the sleeve 51 is sleeved on each connecting rod 4, and the sleeve 51 is fixedly inserted and welded on the peripheral wall of the positioning cylinder 2. The sleeve 51 is provided with a rotation stopping block 511 inside. The peripheral wall of the connecting rod 4 is provided with a clamping groove 42 along the length direction of the connecting rod 4. The rotation stopping block 511 is clamped in the clamping groove 42, and the rotation stopping block 511 is used to limit the rotation of the connecting rod 4. The rotating cylinder 52 is rotationally connected to the sleeve 51 at one end of the sleeve 51 in the inner cavity of the positioning cylinder 2. The inner wall of the rotating cylinder 52 is provided with an internal thread 521 matched with the external thread 41 of the connecting rod 4. The connecting rod 4 is threadedly connected to the connecting rod 4 through the internal thread 521. The driving assembly is used to synchronously drive the rotation of each rotating cylinder 52.

[0035] In use, the driving assembly is used to synchronously drive the rotation of each rotating cylinder 52. Since the connecting rod 4 is threadedly connected to the internal thread 521 in the rotating cylinder 52 and is limited from rotating by the rotation stopping block 511, the connecting rod 4 can only move along the extension direction of the connecting rod 4, thereby driving the supporting block 3 to move outward or inward to realize the supporting or loosening action. The movement of the connecting rod 4 is realized through the threaded connection between the connecting rod 4 and the rotating cylinder 52. The movement of the connecting rod 4 is more accurate and stable, and can bear a larger pressure load, so that the supporting force of the clamp is more stable.

[0036] The driving assembly includes a rotating rod 53, a driving bevel gear 54, a driven bevel gear 55, and a driving part. The rotating rod 53 is rotationally connected to the positioning cylinder 2 about the axis of the positioning cylinder 2. The driving part is arranged on the support 1 and is used to drive the rotation of the rotating rod 53. The driving bevel gear 54 is coaxially connected to the rotating rod 53. The driven bevel gear 55 is arranged in one-to-one correspondence with the rotating cylinder 52, that is, each driven bevel gear 55 is coaxially connected to each rotating cylinder 52, and the driven bevel gear 55 is engaged with the driving bevel gear 54. The driving part is used to drive the rotation of the rotating rod 53, thereby driving the rotation of the driving bevel gear 54, so as to synchronously drive the rotation of all the driven bevel gears 55, thereby realizing the function requirement of the driving assembly for synchronously driving the rotation of each rotating cylinder 52. The structure is simple and convenient to use.

[0037] For example, referring to Figures 1-2The driving component includes a worm wheel 56, a worm 57 and a power element 58. The worm wheel 56 is coaxially connected to the rotating rod 53, the worm 57 is rotatably connected to the support 1, and the worm 57 is engaged with the worm wheel 56. The power element 58 is used to drive the worm 57 to rotate. Exemplarily, the power component adopts a rotating handle which is coaxially connected to the worm 57. In other embodiments, the power component can also adopt a servo motor and a rotary cylinder, as long as it can drive the worm 57 to rotate accurately. The engagement transmission between the worm wheel 56 and the worm 57 can convert the rotary motion of the power element 58 into the rotation of the rotating rod 53, so as to realize the synchronous driving of each rotating cylinder 52. By using the self-locking function of the worm wheel 56 and the worm 57 transmission, the loosening of the supporting block 3 due to external force during use can be effectively prevented, and the stability of the supporting is enhanced.

[0038] The implementation principle of the supporting clamp in the embodiment of the application is as follows: when the workpiece with a circular cone shape is accurately clamped, the workpiece is directly sleeved on the outer peripheral wall of the positioning cylinder 2 through the inner hole, then the rotating handle is rotated, the rotating rod 53 is driven to rotate through the engagement transmission between the worm 57 and the worm wheel 56, then each rotating cylinder 52 is synchronously driven to rotate through the engagement between the driving bevel gear 54 and the plurality of driven bevel gears 55. Since the connecting rod 4 is threadedly connected with the internal thread 521 in the rotating cylinder 52 and is limited by the rotation stopping block 511 and cannot rotate, the connecting rod 4 can only move along the extension direction of the connecting rod 4, thereby driving the supporting block 3 to move outward to realize the supporting action. The clamp of the application has a relatively simple structure, and each transmission component is stable and accurate in transmission, so that the workpiece can be accurately, stably and uniformly supported, and the workpiece with a circular cone shape can be accurately clamped to realize the effect of performing the boring process and the like.

[0039] The above are optional embodiments of the application, and do not limit the protection scope of the application. Therefore, equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. An internal tightening clamp, characterized in that: The invention comprises a bracket (1), a positioning cylinder (2), a tightening block (3), a connecting rod (4) and a driving mechanism (5); the positioning cylinder (2) is fixed on the bracket (1) in the vertical direction; the tightening block (3) is evenly distributed on the outer peripheral wall of the positioning cylinder (2) around the axis of the positioning cylinder (2); one end of the connecting rod (4) is connected to the tightening block (3); the other end of the connecting rod (4) is inserted into the inner cavity of the positioning cylinder (2); the connecting rod (4) extends radially along the positioning cylinder (2); and the driving mechanism (5) is used for synchronously driving each connecting rod (4) to move along its own extension direction.

2. The inner tightening clamp according to claim 1, characterized in that: The driving mechanism (5) comprises a sleeve (51), a rotating cylinder (52) and a driving assembly, wherein the sleeve (51) is sleeved on each connecting rod (4), the sleeve (51) is fixedly inserted on the peripheral wall of the positioning cylinder (2), and a stop block (511) for limiting the rotation of the connecting rod (4) is provided in the sleeve (51); the rotating cylinder (52) is coaxially connected to one end of the sleeve (51) located in the inner cavity of the positioning cylinder (2), an internal thread (521) is provided on the inner wall of the rotating cylinder (52), the connecting rod (4) is inserted into the rotating cylinder (52) and is threadedly connected to the internal thread (521) on the rotating cylinder (52); and the driving assembly is used to synchronously drive each rotating cylinder (52) to rotate.

3. The inner tightening clamp according to claim 2, characterized in that: The driving assembly comprises a rotating rod (53), a driving bevel gear (54), a driven bevel gear (55) and a driving component. The rotating rod (53) is connected to the positioning cylinder (2) in a rotational manner around the axis of the positioning cylinder (2). The driving bevel gear (54) is coaxially connected to the rotating rod (53). The driven bevel gear (55) is coaxially connected to each rotating cylinder (52). The driving bevel gear (54) is simultaneously engaged with each driven bevel gear (55). The driving component is used to drive the rotating rod (53) to rotate.

4. The inner tightening clamp according to claim 3, characterized in that: The driving component comprises a worm wheel (56), a worm (57) and a power piece (58); the worm wheel (56) is coaxially connected to the rotating rod (53); the worm (57) is rotatably connected to the bracket (1); the worm (57) is meshed with the worm wheel (56); and the power piece (58) is used to drive the worm (57) to rotate.

5. The inner tightening clamp according to claim 1, characterized in that: A pressure block (32) is provided at one end of the tightening block (3) away from the positioning cylinder (2).

6. The inner tightening clamp according to claim 1, characterized in that: Each of the tightening blocks (3) is connected to a limiting rod (31), which is passed through the positioning cylinder (2). The limiting rod (31) on the same tightening block (3) is parallel to the connecting rod (4).

7. The inner tightening clamp according to claim 1, characterized in that: The top of the positioning cylinder (2) is chamfered.

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