Moving stroke adjusting type hydraulic three-jaw chuck and using method thereof

Abstract

The invention discloses a moving stroke adjusting type hydraulic three-jaw chuck which comprises a hydraulic sliding block, a three-jaw base, a clamping module, a positioning block, a first screw, a second screw and a third screw, the three-jaw base is provided with a base through hole and a first threaded hole, and the three-jaw base penetrates through the base through hole through the first screw to be connected to the hydraulic sliding block. A first positioning groove is formed in the front part of the three-jaw base; a second positioning groove is formed in the back of the clamping module, a second threaded hole is formed in the second positioning groove, clamping module through holes are formed in the two sides of the clamping module respectively, and a second screw penetrates through the clamping module through holes to be connected to the first threaded hole; the positioning block is provided with a positioning block through hole, the front side and the rear side of the positioning block are installed in the first positioning groove and the second positioning groove respectively, and the third screw penetrates through the positioning block through hole to be connected to the second threaded hole. The invention further discloses a using method of the moving stroke adjusting type hydraulic three-jaw chuck. The hydraulic three-jaw mechanism solves the problem that an existing hydraulic three-jaw mechanism is short in stroke.

Description

Technical Field

[0001] The invention belongs to the technical field of numerically controlled horizontal lathes, and in particular relates to a movable stroke-adjustable hydraulic three-jaw chuck and a use method thereof. Background Art

[0002] The main usage method of the hydraulic three-jaw chuck equipped on the existing CNC horizontal lathe is: before processing the workpiece, it is necessary to perform precision turning on the three-jaw clamping part of the workpiece on the machine tool to ensure that the three jaws are in the same circle and slightly smaller than the inner hole of the workpiece; manually adjust the position of the three jaws according to the diameter of the inner hole of the workpiece so that the clamping diameter of the three jaws is slightly smaller than the inner hole diameter (manually adjust the diameter of the three jaws according to the diameter of the inner hole of the workpiece to make it slightly smaller than the inner hole diameter by 3-5mm), and then fix the three jaws on the hydraulic slide, the hydraulic slide is placed in the chuck and the movement of the three jaws can be controlled by hydraulic pressure, and the movement of the hydraulic slide is controlled by the hydraulic system. When the CNC program controls the three jaws to shrink and enter the inner hole, the three jaws and the hydraulic slide move outward synchronously under program control and clamp the workpiece to realize the clamping action of the three jaws.

[0003] After the CNC program controls the hydraulic three-jaw clamp to retract and enter the workpiece's inner hole, it then synchronously moves outward under program control to clamp the workpiece. Typically, the hydraulic three-jaw clamp has a travel range of only about 10mm (diameter-wise), which is sufficient for supporting through-holes. However, due to the limited adjustment range, in actual production, a single set of three-jaw clamps is required to clamp a single workpiece (for example, supporting an inner hole). This creates the problem of requiring a large number of three-jaw clamps for small-batch, high-variety workpiece production. For applications where the inner hole is larger than 10mm on one side of the hole and the large hole needs to be supported, the existing hydraulic three-jaw clamp cannot be used due to travel limitations. Summary of the Invention

[0004] The purpose of the present invention is to provide a movable stroke adjustable hydraulic three-jaw chuck and a method of using the same, which solves the problem of short stroke of the existing hydraulic three-jaw chuck.

[0005] To achieve the above objectives, the technical solutions used in the present invention are:

[0006] A hydraulic three-jaw chuck with adjustable movable stroke includes: a hydraulic slider, a three-jaw base, a clamping module, a positioning block, a first screw, a second screw, and a third screw. The three-jaw base is provided with a base through hole and a first threaded hole. The first threaded hole is located on both sides of the base through hole. The three-jaw base is connected to the hydraulic slider through the base through hole by a first screw. A first positioning groove is provided on the front of the three-jaw base; the clamping module is provided with a second positioning groove on the back, and a plurality of second threaded holes are provided in the second positioning groove. The clamping module is respectively provided with clamping module through holes on both sides, and the second screw passes through the clamping module through hole and is connected to the first threaded hole; the positioning block is provided with a positioning block through hole, and the front and rear sides of the positioning block are respectively installed in the first positioning groove and the second positioning groove, and the third screw passes through the positioning block through hole and is connected to the second threaded hole.

[0007] Furthermore, the three clamping modules are respectively connected to three three-claw bases. The three-claw base is provided with two positioning strips on the back. The multiple base through holes are located between the two positioning strips, and the multiple first threaded holes are located outside the positioning strips.

[0008] Furthermore, the plurality of base through holes are arranged in a row, the plurality of first threaded holes are longitudinally arranged in two rows, the first threaded holes are located on both sides of the first positioning groove, and the base through holes are located in the first positioning groove.

[0009] Furthermore, the through hole of the clamping module is a long hole.

[0010] Furthermore, the three hydraulic sliders or three-claw bases are respectively connected to a sub-chuck, and the sub-chuck includes: a chuck base, a support rod, a fixed plate, a first pin shaft, and a second pin shaft; the chuck base is provided with a plurality of sub-chuck through holes, and the first screw or the second screw is passed through the sub-chuck through hole, and the chuck base is provided with a first connecting ear at the inner end, and the first connecting ear is provided with a first hinge hole; a support rod through hole is provided at the rear end of the support rod, and the first pin shaft is installed in the support rod through hole and the first hinge hole; a second connecting ear is provided at the bottom of the support rod, and the second connecting ear is provided with a second hinge hole; the fixed plate is provided with three hinge openings, and the hinge opening is provided with a third hinge hole, the three second connecting ears are respectively installed in the three hinge openings, and the second pin shaft is installed in the third hinge hole and the second hinge hole.

[0011] Furthermore, a bent end is provided at the front end of the support rod.

[0012] Furthermore, the three hinged openings are arranged in a triangle.

[0013] The use of hydraulic three-jaw chuck includes:

[0014] Three three-jaw bases are respectively installed on the hydraulic slides of the hydraulic chucks on both sides of the CNC horizontal lathe, the positioning block is placed in the second positioning groove of the clamping module, the third screw passes through the through hole of the positioning block and is connected to the second threaded hole, the positioning block is placed in the first positioning groove at the front of the three-jaw base, and the second screw passes through the through hole of the clamping module and is connected to the first threaded hole;

[0015] Place the three clamping modules into the pipe, the hydraulic slider pushes the three-claw base to move outward, the three-claw base drives the clamping modules to move outward, and the three clamping modules of the hydraulic chucks on both sides clamp the inner wall of the pipe to complete the fixation of the pipe.

[0016] Preferably, three three-claw bases or chuck bases are respectively installed on the three hydraulic slides of the hydraulic chuck on both sides of the CNC horizontal lathe, the first first screw is connected to the hydraulic slide through the auxiliary chuck through hole, or the second screw is connected to the first threaded hole through the auxiliary chuck through hole, the support rod is connected to the first connecting ear by a first pin shaft, and the second pin shaft is installed in the third hinge hole and the second hinge hole to hinge the lower part of the support rod to the fixed plate;

[0017] Place the three support rods into the pipe, the hydraulic slider pushes the three-claw base to move inward, the three-claw base drives the chuck base to move inward, the front ends of the three support rods open, and the bent ends rest against the inner wall of the pipe to complete the fixation of the pipe.

[0018] Preferably, the position of the clamping module on the three-jaw base is adjusted by connecting the first threaded holes of different heights of the three-jaw base by a second screw; or the relative position of the clamping module and the three-jaw base is adjusted by positioning the second screw in the through hole of the clamping module; or the relative position of the three-jaw base and the hydraulic slider is adjusted by installing the first screw in different through holes of the base; or the position of the chuck base on the three-jaw base is adjusted by connecting the first threaded holes of different heights of the three-jaw base by a second screw.

[0019] The technical effects of the present invention include:

[0020] 1. The present invention connects the clamping module to the three-jaw base at different heights through multiple first threaded holes, adjusts the relative position between the three-jaw base and the clamping module, and increases the outward opening diameter of the three three-jaw bases. The multiple base through-holes can also adjust the relative position of the hydraulic chuck and the three-jaw base, further increasing the opening diameter of the three three-jaw bases. The above technical means solve the problem of the short stroke of the existing hydraulic three-jaw chuck, not only enabling the clamping of large-diameter pipes, but also adapting to the clamping of pipes of different diameters, avoiding the technical defect that different specifications of workpieces require different specifications of three-jaw chucks.

[0021] 2. In the present invention, not only does the three-jaw base have a certain adjustable distance, but the clamping module can also be further adjusted on this basis to greatly expand the clamping range of the three-jaw.

[0022] By changing the original integrated three-jaw structure into an adjustable modular structure, the problem that a pair of three-jaws (especially soft jaws) cannot clamp workpieces with different inner holes is solved.

[0023] 3. In the present invention, not only can the clamping position of the workpiece be adjusted, but it can also be installed forward or reverse, or the clamping diameter or inner and outer clamping positions of the workpiece can be changed as the three-jaw base connected to the chuck is installed forward or reverse, which effectively improves the application range and the clamping method of the workpiece, expands the processing surface of the workpiece, and improves the processing efficiency of the workpiece.

[0024] If the clamping module moves outward, it can clamp an inner hole with a larger diameter. If the clamping module moves inward, it can clamp an inner hole with a smaller diameter. The same is true for clamping an outer circle.

[0025] 4. The auxiliary chuck of the present invention retracts the three jaws through the lever principle and the limited displacement of the hydraulic three jaws under program control.

[0026] When the three claws move outward, the end of the lever contracts, making it easier to extend into the inner hole of the pipe. When the three claws reach the predetermined position, the three claws move inward and the end of the lever expands outward to clamp the pipe.

[0027] The fixed plate serves as the fulcrum in the lever principle, the limited displacement (no more than 10 mm) and force of the three claws serve as the force application point, and the amplified displacement and force of the lever end serve as the force receiving point.

[0028] The displacement is amplified by the ratio of the distance between the two points and the fulcrum, so that the small diameter of the pipe mouth can be avoided and the inner diameter of the pipe can be clamped, which is convenient for clamping the inner wall of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of a hydraulic three-jaw chuck with adjustable travel in the present invention;

[0030] Figure 2 This is an exploded view of the structure of the movable stroke adjustable hydraulic three-jaw chuck of the present invention;

[0031] Figure 3 This is a schematic diagram of the use state of an embodiment of the present invention;

[0032] Figure 4 It is a structural exploded view of the auxiliary chuck in the present invention. DETAILED DESCRIPTION

[0033] The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce the invention.

[0034] Example 1

[0035] like Figure 1 As shown in FIG, it is a structural diagram of the movable stroke adjustable hydraulic three-jaw chuck of the present invention; Figure 2 1 is a structural exploded view of the movable stroke adjustable hydraulic three-jaw chuck of the present invention.

[0036] The movable stroke adjustable hydraulic three-jaw chuck comprises: a three-jaw base 1, a clamping module 2, a positioning block 3, a first screw 4, a second screw 5, and a third screw 6; the three clamping modules 2 are respectively connected to the three three-jaw bases 1 through the first screw 4, and the positioning block 3 is installed between the three-jaw base 1 and the clamping module 2.

[0037] The three-jaw base 1 is fixed to the hydraulic slide of the hydraulic chuck by the first screw 4. The three-jaw base 1 is provided with two positioning bars 11 on the back. The three-jaw base 1 is provided with a base through hole 12 and a first threaded hole 13. Multiple base through holes 12 are located between the two positioning bars 11, and multiple first threaded holes 13 are located on the outside of the positioning bar 11. The three-jaw base 1 is provided with a first positioning groove 14 at the front, and the first screw 4 is installed in the base through hole 12.

[0038] The plurality of base through holes 12 are arranged in a row, and the plurality of first threaded holes 13 are arranged in two rows longitudinally and located on both sides of the first positioning groove 14 . The base through holes 12 are located in the first positioning groove 14 .

[0039] The clamping module 2 is provided with a second positioning groove 21 on the back, and a plurality of second threaded holes 22 are provided in the second positioning groove 21 . The clamping module 2 is provided with clamping module through holes 23 on both sides. The second screw 5 passes through the clamping module through holes 23 and is connected to the first threaded hole 13 .

[0040] The clamping module through hole 23 is a long hole, and the clamping module through hole 23 can also be used to adjust the relative positions of the clamping module 2 and the three-claw base 1.

[0041] The positioning block 3 is provided with a positioning block through hole 31 . The front and rear sides of the positioning block 3 are respectively installed in the first positioning groove 14 and the second positioning groove 21 . The third screw 6 passes through the positioning block through hole 31 and is connected to the second threaded hole 22 .

[0042] When a three-jaw chuck is used to clamp a workpiece for processing pipes on a CNC horizontal lathe, the three jaws need to be adjusted due to changes in the diameter (outer diameter or inner diameter) of the pipe. If the standard three-jaw adjustment distance is not enough, it cannot be used and a new three-jaw must be replaced. The clamping module 2 can be connected to different heights through multiple first threaded holes 13, and the relative position between the three-jaw base 1 and the clamping module 2 is adjusted, thereby increasing the diameter of the three three-jaw bases 1 opened to the outside. The relative position of the hydraulic chuck and the three-jaw base 1 can be adjusted through multiple base through-holes 12, further increasing the opening diameter of the three three-jaw bases 1. Through the above-mentioned technical means, the short stroke of the existing hydraulic three-jaw is solved at the same time, and it can adapt to the clamping of pipes of different diameters. Not only does the three-jaw base 1 have a certain adjustable distance, but the clamping module 2 can also be further adjusted on this basis, greatly expanding the clamping range of the three jaws.

[0043] More conveniently, in addition to adjusting the position, the clamping module 2 can also be installed forward or backward, or the clamping diameter or the inner and outer clamping positions can be changed as the three-jaw base 1 connected to the chuck is installed forward or backward.

[0044] like Figure 3 FIG. 1 is a schematic diagram of the usage status of Example 1 of the present invention.

[0045] The specific steps for using a hydraulic three-jaw chuck with adjustable travel are as follows:

[0046] Step 1: Install three three-jaw bases 1 on the hydraulic slides of the hydraulic chucks on both sides of the CNC horizontal lathe. Place the positioning block 3 in the second positioning groove 21 of the clamping module 2. Pass the third screw 6 through the positioning block through-hole 31 and connect it to the second threaded hole 22. Place the positioning block 3 in the first positioning groove 14 at the front of the three-jaw base 1. Pass the second screw 5 through the clamping module through-hole 23 and connect it to the first threaded hole 13.

[0047] Select the appropriate height and connect the second screw 5 to the first threaded hole 13 at a different height on the three-jaw base 1 to adjust the position of the clamping module 2 on the three-jaw base 1. Alternatively, the second screw 5 can be positioned within the clamping module through-hole 23 to adjust the relative position of the clamping module 2 and the three-jaw base 1. Alternatively, the first screw 4 can be installed in different base through-holes 12 to adjust the relative position of the three-jaw base 1 and the hydraulic slide.

[0048] Step 2: Place the three clamping modules 2 into the pipe. The hydraulic slider pushes the three-jaw base 1 to move outward. The three-jaw base 1 drives the clamping modules 2 to move outward. The three clamping modules 2 of the hydraulic chucks on both sides clamp the inner wall of the pipe to complete the fixation of the pipe.

[0049] Subsequently, the CNC horizontal lathe can be operated to process the pipes.

[0050] Example 2

[0051] like Figure 4 FIG. 1 is an exploded view of the structure of the auxiliary chuck 4 in the present invention.

[0052] The auxiliary chuck 4 (three) can be directly fixed to the three-jaw base 1 (three) in Example 1 through the first screw 4, or can be fixed to the hydraulic chuck through the first screw 4. The structure of the auxiliary chuck 4 includes: a chuck base 41, a support rod 42, a fixed plate 43, a first pin shaft 44, and a second pin shaft 45; the chuck base 41 is provided with a plurality of auxiliary chuck through holes 411, and the first screw 4 / second screw 5 is passed through the auxiliary chuck through hole 411. The chuck base 41 is provided with a first connecting ear 412 at the inner end, and the first connecting ear 47 is provided with a first hinge hole 413.

[0053] A support rod through hole 421 is provided at the rear end of the support rod 42, and the first pin shaft 44 is installed in the support rod through hole 421 and the first hinge hole 413, hingedly connecting the rear end of the support rod 42 to the first connecting ear 412; a second connecting ear 422 is provided at the bottom of the support rod 42, and the second connecting ear 422 is provided with a second hinge hole 423; the front end of the support rod 42 is bent outward to form a bent end.

[0054] The fixed plate 43 is provided with three hinged openings, and the hinged opening is provided with a third hinge hole 431. The three second connecting ears 422 are respectively installed in the three hinged openings. The second pin shaft 45 is installed in the third hinge hole 431 and the second hinge hole 423 to hinge the lower part of the support rod 42 with the fixed plate 43.

[0055] Three hinged openings are arranged in a triangle.

[0056] The support rod 42 forms a lever shape with the second connecting ear 422 as the fulcrum. When the hydraulic chuck moves at any time, the chuck base 41 moves. The bent end of the front end of the support rod 42 can shrink inward or expand outward to form a positioning for the inner wall of the pipe.

[0057] The present invention is mainly suitable for processing pipes, and is particularly suitable for directly processing the end face of a workpiece or a welding groove at the end face when the inner hole is supported by soft jaws, thereby greatly reducing the number of configured three jaws.

[0058] The specific steps for using a hydraulic three-jaw chuck with adjustable travel are as follows:

[0059] Step 1: Install three three-jaw bases 1 on the hydraulic slides of the hydraulic chucks on both sides of the CNC horizontal lathe. The second screw 5 passes through the through hole 411 of the auxiliary chuck and is connected to the first threaded hole 13. The support rod 42 is connected to the first connecting ear 412 by the first pin 44. The second pin 45 is installed in the third hinge hole 431 and the second hinge hole 423. The lower part of the support rod 42 is hinged to the fixed plate 43.

[0060] Select a suitable height and connect the first threaded holes 13 of the three-jaw base 1 at different heights through the second screw 5 to adjust the position of the chuck base 41 on the three-jaw base 1.

[0061] Step 2: Place the three support rods 42 into the pipe, the hydraulic slider pushes the three-claw base 1 to move inward, the three-claw base 1 drives the chuck base 41 to move inward, the front ends of the three support rods 42 are opened, and the bent ends are against the inner wall of the pipe to complete the fixation of the pipe.

[0062] Subsequently, the CNC horizontal lathe can be operated to process the pipes.

[0063] The terms used in this invention are descriptive and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the technical solution, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A hydraulic three-jaw chuck with adjustable travel, comprising: The hydraulic slider is characterized in that it also includes: a three-claw base, a clamping module, a positioning block, a first screw, a second screw, and a third screw. The three-claw base is provided with a base through hole and a first threaded hole. The first threaded hole is located on both sides of the base through hole. The three-claw base is connected to the hydraulic slider through the base through hole by the first screw. The front of the three-claw base is provided with a first positioning groove; the clamping module is provided with a second positioning groove on the back, and a plurality of second threaded holes are provided in the second positioning groove. The clamping module is respectively provided with clamping module through holes on both sides, and the second screw passes through the clamping module through hole and is connected to the first threaded hole; the positioning block is provided with a positioning block through hole, and the front and rear sides of the positioning block are respectively installed in the first positioning groove and the second positioning groove, and the third screw passes through the positioning block through hole and is connected to the second threaded hole.

2. The movable stroke adjustable hydraulic three-jaw chuck according to claim 1, characterized in that: The three clamping modules are respectively connected to three three-claw bases. The three-claw base is provided with two positioning strips on the back. A plurality of base through holes are located between the two positioning strips, and a plurality of first threaded holes are located outside the positioning strips.

3. The movable stroke adjustable hydraulic three-jaw chuck according to claim 1, characterized in that: A plurality of base through holes are arranged in a row, a plurality of first threaded holes are longitudinally arranged in two rows, the first threaded holes are located on both sides of the first positioning groove, and the base through holes are located in the first positioning groove.

4. The movable stroke adjustable hydraulic three-jaw chuck according to claim 1, characterized in that: The through hole of the clamping module is a long hole.

5. The movable stroke adjustable hydraulic three-jaw chuck according to claim 1, characterized in that: The three hydraulic sliders or three-claw bases are respectively connected to the auxiliary chucks, and the auxiliary chucks include: a chuck base, a support rod, a fixed plate, a first pin shaft, and a second pin shaft; the chuck base is provided with a plurality of auxiliary chuck through holes, and the first screw or the second screw is passed through the auxiliary chuck through hole, and the chuck base is provided with a first connecting ear at the inner end portion, and the first connecting ear is provided with a first hinge hole; a support rod through hole is provided at the rear end of the support rod, and the first pin shaft is installed in the support rod through hole and the first hinge hole; a second connecting ear is provided at the bottom of the support rod, and the second connecting ear is provided with a second hinge hole; the fixed plate is provided with three hinge openings, and the hinge opening is provided with a third hinge hole, the three second connecting ears are respectively installed in the three hinge openings, and the second pin shaft is installed in the third hinge hole and the second hinge hole.

6. The movable stroke adjustable hydraulic three-jaw chuck according to claim 5, characterized in that: The front end of the support rod is provided with a bent end.

7. The hydraulic three-jaw chuck with adjustable travel according to claim 5, characterized in that: Three hinged openings are arranged in a triangle.

8. The method for using the movable stroke adjustable hydraulic three-jaw chuck according to claim 1, characterized in that: include: Three three-jaw bases are respectively installed on the hydraulic slides of the hydraulic chucks on both sides of the CNC horizontal lathe, the positioning block is placed in the second positioning groove of the clamping module, the third screw passes through the through hole of the positioning block and is connected to the second threaded hole, the positioning block is placed in the first positioning groove at the front of the three-jaw base, and the second screw passes through the through hole of the clamping module and is connected to the first threaded hole; Place the three clamping modules into the pipe, the hydraulic slider pushes the three-claw base to move outward, the three-claw base drives the clamping modules to move outward, and the three clamping modules of the hydraulic chucks on both sides clamp the inner wall of the pipe to complete the fixation of the pipe.

9. The method for using the movable stroke adjustable hydraulic three-jaw chuck according to claim 5, characterized in that: include: Three three-claw bases or chuck bases are respectively installed on the three hydraulic slides of the hydraulic chuck on both sides of the CNC horizontal lathe. The first first screw is connected to the hydraulic slide through the auxiliary chuck through hole, or the second screw is connected to the first threaded hole through the auxiliary chuck through hole. The support rod is connected to the first connecting ear by a first pin shaft, and the second pin shaft is installed in the third hinge hole and the second hinge hole to hinge the lower part of the support rod with the fixed plate; Place the three support rods into the pipe, the hydraulic slider pushes the three-claw base to move inward, the three-claw base drives the chuck base to move inward, the front ends of the three support rods open, and the bent ends rest against the inner wall of the pipe to complete the fixation of the pipe.

10. The method for using the movable stroke adjustable hydraulic three-jaw chuck according to claim 8 or 9, characterized in that: The position of the clamping module on the three-jaw base can be adjusted by connecting the first threaded holes of different heights of the three-jaw base with the second screw; or the relative position of the clamping module and the three-jaw base can be adjusted by positioning the second screw in the through hole of the clamping module; or the relative position of the three-jaw base and the hydraulic slider can be adjusted by installing the first screw in different through holes of the base; or the position of the chuck base on the three-jaw base can be adjusted by connecting the first threaded holes of different heights of the three-jaw base with the second screw.

Images