CN112338575B - Constant-pressure constant-center multifunctional self-centering center frame - Google Patents
Constant-pressure constant-center multifunctional self-centering center frame Download PDFInfo
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- CN112338575B CN112338575B CN202011493453.4A CN202011493453A CN112338575B CN 112338575 B CN112338575 B CN 112338575B CN 202011493453 A CN202011493453 A CN 202011493453A CN 112338575 B CN112338575 B CN 112338575B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/72—Auxiliary arrangements; Interconnections between auxiliary tables and movable machine elements
- B23Q1/76—Steadies; Rests
- B23Q1/763—Rotating steadies or rests
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Abstract
The invention discloses a constant-pressure constant-center multifunctional self-centering center frame, which comprises a mounting seat, a center sliding plate and two support arms, wherein a chuck is respectively arranged on the two support arms and the center sliding plate; two guide sliding grooves for assembling corresponding support arms are formed in the central sliding plate, a track pin is arranged on each support arm, a central adjusting mechanism for adjusting the support arm and a central adjusting block for supporting the track pin are arranged in the mounting seat corresponding to each support arm, and a track groove for forcing the support arm to slide along the guide sliding grooves when the central sliding plate moves through the constraint track pin is formed between the central adjusting mechanism and the central adjusting block; the mounting seat is provided with a hydraulic cylinder which drives the two support arms to control the workpiece in a circle formed by the support points of the three chucks through driving the central slide plate. The invention adopts hydraulic drive, reduces the outline dimension of the center frame, increases the clamping range, has high reliability and good usability, and is suitable for machine tools with small installation space and large clamping range.
Description
Technical Field
The invention relates to the technical field of machining equipment, in particular to a center frame applied to a lathe, and specifically relates to a constant-pressure constant-center multifunctional self-centering center frame.
Background
The center frame is an auxiliary supporting device used in the turning or grinding process of slender shaft parts, so that high-precision machining of parts such as superfine optical shafts, precise screw rods, ball screws and the like is possible. In the prior art, a mechanical three-jaw transfer center frame is commonly adopted on a machine tool, the center of a workpiece is troublesome to adjust, and the machine tool is difficult to install in a machine tool with small space and large clamping range due to the large external dimension and small clamping range.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a constant-pressure constant-center multifunctional self-centering bracket which adopts hydraulic drive, has small volume and large clamping range and can automatically adjust the center position of a workpiece.
The technical scheme adopted for solving the technical problems is as follows:
The constant-pressure constant-center multifunctional self-centering center frame comprises a center sliding plate and two support arms, wherein the center sliding plate is arranged in a mounting seat in a sliding manner, the two support arms are arranged on the center sliding plate, and the centers of the front ends of the two support arms and the front end surface of the center sliding plate are respectively provided with a chuck for rotatably supporting a workpiece; two guide sliding grooves for sliding and assembling the corresponding support arms are formed in the central sliding plate, a track pin is fixedly arranged on each support arm, a central adjusting mechanism for adjusting the center distance of the support arms and a central adjusting block for rolling and supporting the track pins are arranged in the mounting seat corresponding to each support arm, and a track groove for forcing the support arms to slide along the guide sliding grooves when the central sliding plate moves through the constraint track pins is formed between the central adjusting mechanism and the central adjusting block; the rear of the mounting seat is fixedly provided with a hydraulic cylinder which drives the two support arms to control the workpiece in a circle formed by the support points of the three chucks through driving the central sliding plate.
In order to optimize the technical scheme, the specific measures adopted further comprise:
The two guide sliding grooves comprise a left guide sliding groove formed on the left surface of the central sliding plate and a right guide sliding groove formed on the right surface of the central sliding plate, and the left guide sliding groove and the right guide sliding groove are distributed on the central sliding plate in an X shape; the two support arms comprise a lower support arm which is arranged in the left guide chute in a sliding way and an upper support arm which is arranged in the right guide chute in a sliding way.
The mounting seat is a flat box body with an opening at the front end, and the flat box body is formed by assembling three side plates and two cover plates; the three side plates comprise an upper side plate, a lower side plate and a rear side plate, and the two cover plates comprise a left cover plate and a right cover plate; the left cover plate and the right cover plate are respectively provided with an assembly hole for installing a central adjusting mechanism and an adjusting cavity for installing a central adjusting block in a vertically penetrating way, and the assembly holes penetrate through the adjusting cavities; the center adjusting mechanism for adjusting the lower support arm is arranged in the assembly hole of the left cover plate, and the center adjusting mechanism for adjusting the upper support arm is arranged in the assembly hole of the right cover plate.
The center adjusting mechanism consists of an adjusting nut, an adjusting rod, a center adjusting sliding rail, an adjusting rod screw and an adjusting rod sleeve; the adjusting rod can be arranged in the assembly hole of the cover plate in a vertical moving way, the central adjusting sliding rail is fixedly arranged at the position, which is positioned in the adjusting cavity, of the adjusting rod and can synchronously move along with the adjusting rod, the upper end of the adjusting rod extends out of the assembly hole and is spirally connected with the adjusting nut, the adjusting rod sleeve is sleeved on the adjusting rod, the adjusting rod sleeve is provided with a strip-shaped sliding groove used for limiting the adjusting rod screw to move only along the length of the adjusting rod screw, and the adjusting rod screw penetrates through the sliding groove in a sliding way and is fixedly connected with the adjusting rod screw in a screwing way.
The cover plate is provided with an installation window which is convenient for installing the adjusting rod screw, and an acrylic plate which is used for preventing the adjusting rod sleeve from rotating is clamped on the installation window; the lower orifice of the assembly hole is spirally provided with a cover plate plug, the adjusting rod is provided with a pre-tightening spring, the upper end of the pre-tightening spring positioned in the left cover plate is propped against the lower end of the adjusting rod, and the lower end of the pre-tightening spring positioned in the left cover plate is propped against the cover plate plug; the pre-tightening spring in the right cover plate is sleeved on the adjusting rod, the upper end of the pre-tightening spring is propped against the lower end of the adjusting rod sleeve, and the lower end of the pre-tightening spring is propped against the check ring arranged on the adjusting rod.
The upper orifice fixed mounting that is located the pilot hole on the apron above-mentioned has with adjusting nut anticreep cutting ferrule matched with adjust knob fixed plate, and adjusting nut upper end is through screw fixed mounting has the adjust knob that makes things convenient for manual rotatory adjusting nut to drive the regulation pole and reciprocate.
The track groove is formed between the inclined plane of the central adjusting slide rail of the central adjusting mechanism and the inclined plane of the central adjusting block, the track pin is sleeved with three annular sleeves in rolling contact with the track groove, the inclined plane of the central adjusting slide rail is an inward concave inclined plane with an inner groove in the middle, and the inclined plane of the central adjusting block is an outward convex inclined plane with an outer convex strip formed at the position corresponding to the inner groove.
An elastic pressing mechanism used for elastically pressing to ensure that the central adjusting block can elastically press the annular sleeve all the time is arranged in the adjusting cavity of the cover plate, the elastic pressing mechanism comprises a spring cushion block, a pressing spring pressed between the spring cushion block and the central adjusting block and a spring supporting pin used for adjusting the pre-tightening pressure of the pressing spring, and an adjusting cavity cover is arranged at an cavity opening cover of the adjusting cavity.
An air inlet valve is fixedly arranged on the upper side plate, an air inlet duct connected with the air inlet valve is processed in the upper side plate, and an inner air passage used for communicating the air inlet duct with a guide chute to enable the guide chute to form a static pressure track is processed in the central sliding plate; and a silencer is also arranged on the rear side plate.
The cylinder body of the hydraulic cylinder is fixed on the rear side plate, and a piston rod of the hydraulic cylinder passes through the rear side plate to be connected with the central sliding plate; the cylinder body is provided with a hydraulic valve consisting of a valve core body, a valve core and a valve core ejector rod.
Compared with the prior art, the invention has the advantages that the central slide plate which can be used as the central arm and the two support arms which are arranged on the central slide plate and controlled by the movement of the central slide plate are arranged in the mounting seat, the front ends of the two support arms and the central slide plate are respectively provided with the clamping heads for rotationally supporting the workpiece, the central adjusting mechanism is also arranged in the mounting seat corresponding to each support arm, and the position of the support arm can be adjusted through the central adjusting mechanism, so that the aim of adjusting the distance between the clamping heads on the support arm and the central axis of the central slide plate is fulfilled. A track groove which forces the support arm to slide along the guide chute when the central sliding plate moves through the constraint track pin is formed between the central adjusting mechanism and the central adjusting block; the rear of the mounting seat is fixedly provided with a hydraulic cylinder, and the hydraulic cylinder drives the center sliding plate to drive the two support arms to control the workpiece in a circle formed by the supporting points of the three chucks, so that the self-centering function of the center frame is realized. The invention uses a hydraulic cylinder to drive the two support arms to move while pushing the central slide plate as the central arm. Under the same conditions, compared with the mechanical three-jaw transfer center frame commonly adopted on the existing grinding machine, the three-jaw transfer center frame can greatly save the time for loading and unloading workpieces and reduce the trouble of adjusting the center of the workpieces.
The invention adopts the hydraulic cylinder as power, reduces the outline dimension of the center frame, increases the clamping range, has high reliability and good usability, and is suitable for machine tools with small installation space and large clamping range.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a front view block diagram of the present invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a schematic view of the structure of FIG. 2 with the right cover plate removed;
FIG. 5 is a rear view of the left cover plate of FIG. 2 with the left cover plate removed;
FIG. 6 is a cross-sectional block diagram of A-A of FIG. 2;
FIG. 7 is a cross-sectional view of the B-B structure of FIG. 3;
FIG. 8 is a cross-sectional view of the structure of C-C of FIG. 4;
FIG. 9 is an enlarged partial schematic view of the portion II of FIG. 8;
FIG. 10 is a schematic view of the present invention with a chuck adapted to hold a fine pitch workpiece;
FIG. 11 is a schematic view of the present invention with a chuck adapted to hold a high pitch workpiece;
Fig. 12 is a schematic view of the structure of the present invention fitted with a chuck adapted to hold a polish rod workpiece.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Fig. 1 to 12 are schematic views of the construction and wall pile of the present invention.
Wherein the reference numerals are as follows: the retainer ring D, the intake valve F, the track groove G, the muffler Q, the clip T, the mount 1, the assembly hole 1a, the adjustment chamber 1b, the upper plate 11, the intake duct 11a, the lower plate 12, the rear plate 13, the left cover plate 14, the right cover plate 15, the cover plate plug 16, the adjustment chamber cover 17, the center slide plate 2, the guide chute 2a, the inner air passage 21, the arm 3, the track pin 4, the annular sleeve 41, the center adjustment mechanism 5, the adjustment nut 51, the adjustment lever 52, the center adjustment slide rail 53, the inner groove 53a, the adjustment lever screw 54, the pretension spring 55, the adjustment lever sleeve 56, the chute 56a, the acryl plate 57, the adjustment knob fixing plate 58, the adjustment knob 59, the center adjustment block 6, the outer cam 6a, the hydraulic cylinder 7, the cylinder 71, the piston rod 72, the elastic pressing mechanism 8, the spring spacer 81, the pressing spring 82, the spring support pin 83, the hydraulic valve 9, the valve body 91, the valve spool 92, the jack 93.
As shown in fig. 1 to 12, the invention provides a constant-pressure constant-center multifunctional self-centering center frame, which comprises a mounting seat 1 similar to a square flat box body and a center sliding plate 2 which is arranged in the mounting seat 1 in a sliding manner and can be used as a center arm, wherein two guide sliding grooves 2a are formed on the center sliding plate 2, and a support arm 3 capable of moving along the guide sliding grooves 2a is arranged in each guide sliding groove 2a in a sliding manner. Two support arms 3 are mounted on the two guide sliding grooves 2a, and a chuck T for rotatably supporting a workpiece is mounted at the front ends of the two support arms 3 and the center of the front end face of the center sliding plate 2. The chuck T may be adapted to hold workpieces of a small pitch, and may be provided with different chucks, for example, a chuck 4 as shown in fig. 10, the chuck 4 being adapted to hold workpieces of a small pitch. A chuck 4 as shown in fig. 11 may also be provided, which chuck 4 is adapted to hold a workpiece with a high pitch thread. It is of course also possible to install a chuck 4 as shown in fig. 12, which chuck 4 is adapted to hold a work piece of polished rod. As shown in fig. 8 and 9, each of the two support arms 3 of the present invention is fixedly provided with a track pin 4, the support arm 3 is formed with a pin hole for fixedly mounting the track pin 4, and one end of the track pin 4 is fixedly inserted into the pin hole. A set of center adjusting mechanism 5 for adjusting the center distance of the support arms 3 and a center adjusting block 6 for rolling the support rail pin 4 are arranged in the mounting seat 1 corresponding to each support arm 3. Since the collet 4 is mounted at the front end of the arm 3, when the arm 3 is fine-tuned up and down, the distance between the collet 4 and the central axis of the center slide plate 2, that is, the center distance, can be changed. The chuck 4 can be ensured to be in contact with the workpiece by adjusting the support arm 3 by the central adjusting mechanism 5. A space with equal width is formed between the central adjusting mechanism 5 and the central adjusting block 6, and the space is a track groove G which forces the support arm 3 to slide along the guide chute 2a when the central sliding plate 2 moves through the constraint track pin 4. The invention is characterized in that a hydraulic cylinder 7 is fixedly arranged at the rear of a mounting seat 1, and the hydraulic cylinder 7 is used for driving a central sliding plate 2 to drive two support arms 3 to move. When the hydraulic cylinder 7 pushes the central slide plate 2 to move forwards, the support arms 3 can force the two support arms 3 to move backwards along the respective guide sliding grooves 2a due to the constraint of the track pins 4 and the track grooves G, so that the distance between the three clamping heads T on the two support arms 3 and the central slide plate 2 is reduced, the workpiece is controlled in a circle formed by the supporting points of the three clamping heads T, and the self-centering adjustment of the central frame is realized. When the hydraulic cylinder 7 pulls the central slide plate 2 to retreat, the support arms 3 are restrained by the track pins 4 and the track grooves G, and the two support arms 3 can move forward along the respective guide sliding grooves 2a to reset, so that the distance between the total three chucks T on the two support arms 3 and the central slide plate 2 is increased.
The invention adopts a hydraulic cylinder with hydraulic pressure as power, and drives the center slide plate and the three chucks T on the two support arms to move simultaneously by pushing the center slide plate in the middle, under the same condition, compared with the mechanical three-jaw transfer center frame commonly adopted on the existing grinding machine, the invention can greatly save the time for loading and unloading workpieces and reduce the trouble of adjusting the center of the workpieces. The center frame adopts an oil cylinder design, reduces the outline dimension of the center frame, increases the clamping range, and is suitable for machine tools with small installation space and large clamping range. The center frame is high in reliability and good in usability.
In the embodiment, one of the two guide sliding grooves 2a on the central sliding plate 2 is formed on the left plate surface of the central sliding plate 2, the other guide sliding groove 2a on the left plate surface and the guide sliding groove 2a on the right plate surface of the central sliding plate 2 are distributed in an X shape on the central sliding plate 2. For the convenience of understanding, one of the two support arms 3 is used as an upper support arm, the other of the two support arms 3 is used as a lower support arm, the lower support arm is slidably arranged in a guide chute 2a on the left plate surface of the center slide plate 2, and the upper support arm is slidably arranged in a guide chute 2a on the right plate surface of the center slide plate 2.
In the embodiment, in order to facilitate the installation of the internal components, the installation seat 1 of the invention is a flat box body with an open front end, which is formed by assembling three side plates and two cover plates. The three side panels include an upper panel 11, a lower panel 12 and a rear panel 13, and the two cover panels include a left cover panel 14 and a right cover panel 15. The central adjusting mechanism 5 of the present invention is installed in the cover plate, and the left cover plate 14 and the right cover plate 15 are each processed with an assembly hole 1a for installing the central adjusting mechanism 5 and an adjusting cavity 1b for installing the central adjusting block 6 in a vertically penetrating manner, and the assembly holes 1a penetrate through the adjusting cavity 1b. The center adjusting mechanism 5 for adjusting the lower arm is provided in the fitting hole 1a of the left cover plate 14, and the center adjusting mechanism 5 for adjusting the upper arm is provided in the fitting hole 1a of the right cover plate 15.
As shown in fig. 4, 5 and 6, the center adjusting mechanism 5 of the present invention is composed of an adjusting nut 51, an adjusting rod 52, a center adjusting slide rail 53, an adjusting rod screw 54 and an adjusting rod sleeve 56; the adjusting rod 52 is arranged in the assembly hole 1a of the cover plate in a vertically movable way, the central adjusting slide rail 53 is fixedly arranged on the adjusting rod 52 at a position which is positioned in the adjusting cavity 1b and can synchronously move along with the adjusting rod 52, the upper end of the adjusting rod 52 extends out of the assembly hole 1a and is in spiral connection with the adjusting nut 51, the adjusting rod sleeve 56 is sleeved on the adjusting rod 52, the adjusting rod sleeve 56 is provided with a strip-shaped sliding groove 56a for limiting the adjusting rod screw 54 to move only along the length of the adjusting rod sleeve, and the adjusting rod screw 54 slidably penetrates through the sliding groove and is in spiral solid-phase connection with the adjusting rod 52.
An adjusting knob fixing plate 58 matched with the anti-falling clamping sleeve of the adjusting nut 51 is fixedly arranged at the upper orifice of the assembly hole 1a on the cover plate, and an adjusting knob 59 which is convenient for manually rotating the adjusting nut 51 to drive the adjusting rod 52 to move up and down is fixedly arranged at the upper end of the adjusting nut 51 through a screw. The cover plate is provided with a mounting window which is convenient for mounting the adjusting rod screw 54, and an acrylic plate 57 which is used for preventing the adjusting rod sleeve 56 from rotating is clamped on the mounting window.
The adjusting nut 51 of the invention is clamped on the adjusting knob fixing plate 58, and can only be rotated, the adjusting nut 51 is provided with internal threads, the upper end of the adjusting rod 52 is provided with external threads, and the adjusting nut 51 is connected with the adjusting rod 52 through threads. When the adjusting nut 51 is rotated by the adjusting knob 59, the acrylic plate 57 presses the adjusting rod sleeve 56 to be immovable, the adjusting rod screw 54 is restrained by the sliding groove 56a of the adjusting rod sleeve 56, so that the adjusting rod 52 can only move up and down to displace under the rotation action of the adjusting nut 51, and the central adjusting slide rail 53 fixed on the adjusting rod 52 can move along with the adjusting rod, and the purpose of adjusting the support arm 3 is achieved through the central adjusting slide rail 53 and the track pin 4.
In the embodiment, the lower orifice of the fitting hole 1a of the present invention is screw-fitted with the cover plug 16 to seal the lower orifice of the fitting hole 1a with the cover plug 16. The adjusting lever 52 of the center adjusting mechanism 5 of the present invention is also provided with a pretension spring 55. As is clear from fig. 6 of the present invention, the installation methods of the pretensioning springs 55 of the two center adjustment mechanisms 5 of the present invention are slightly different, wherein the upper ends of the pretensioning springs 55 installed in the left cover plate 14 are pressed against the lower ends of the adjustment rods 52, and the lower ends of the pretensioning springs 55 are abutted against the cover plate plugs 16. The pre-tightening spring 55 installed in the right cover plate 15 is sleeved on the adjusting rod 52, the upper end of the pre-tightening spring 55 is propped against the lower end of the adjusting rod sleeve 56, and the lower end of the pre-tightening spring 55 is propped against the retainer ring D installed on the adjusting rod 52.
In the embodiment, as shown in fig. 4 and 5 and fig. 8 and 9, the track groove G of the present invention is formed between the inclined surface of the center adjusting slide rail 53 of the center adjusting mechanism 5 and the inclined surface of the center adjusting block 6, and three annular sleeves 41 in rolling contact with the track groove G are sleeved on the track pin 4, and two short annular sleeves and one long annular sleeve are arranged in the three annular sleeves 41. The inclined plane of the central adjusting slide rail 53 is an inward concave inclined plane with an inner groove 53a in the middle, and the inclined plane of the central adjusting block 6 is an outward convex inclined plane with an outer convex strip 6a formed at the position corresponding to the inner groove 53 a. The invention can avoid the excessive resistance generated when the track pin 4 moves through the matching of the concave inclined plane and the convex inclined plane.
An elastic pressing mechanism 8 for elastically pressing to ensure that the central adjusting block 6 can elastically press the annular sleeve 41 all the time is arranged in an adjusting cavity 1b of the cover plate, the elastic pressing mechanism 8 comprises a spring cushion block 81, a pressing spring 82 pressed between the spring cushion block 81 and the central adjusting block 6 and a spring supporting pin 83 for adjusting the pre-pressing pressure of the pressing spring 82, and an adjusting cavity cover 17 is arranged at a cavity opening cover of the adjusting cavity 1 b. The central adjusting block 6 is pressed against the annular sleeve 41 by the pressing spring 82, so that the distance between the inclined surface of the central adjusting slide rail 53 and the inclined surface of the central adjusting block 6 is always the diameter of the annular sleeve 41.
In the embodiment, as shown in fig. 7, an intake valve F is fixedly installed on the upper plate 11 of the present invention, and an intake duct 11a connected to the intake valve F is formed in the upper plate 11, and an internal air passage 21 for communicating the intake duct 11a with the guide chute 2a is formed in the center slide plate 2. The internal air duct 21 can introduce air under pressure into the guide runner 2a, so that the guide runner 2a forms a static pressure rail. The rear plate 13 of the present invention is also provided with a muffler Q.
The cylinder body 71 of the hydraulic cylinder 7 is fixed on the rear side plate 13, and the piston rod 72 of the hydraulic cylinder 7 passes through the rear side plate 13 to be connected with the center slide plate 2; the cylinder 71 is provided with a hydraulic valve 9 consisting of a valve core 91, a valve core 92 and a valve core ejector rod 93.
The invention can automatically adjust the center position of the workpiece according to the conditions of the excircle of the workpiece or the swinging of the axis of the rotating shaft and the like in the rotating process of the workpiece, prevents the additional deformation caused by the interaction between internal forces caused by the rigid support and the oscillation of the whole system caused by the interaction, ensures constant supporting force, and ensures the support to be more stable.
The working principle of the invention is as follows:
Under the action of hydraulic oil, the central slide plate 2 connected with the piston rod 72 is forced to drive the two support arms 3 to move back and forth. Since the track pin 4 is constrained by the track grooves G, the chucks T will converge toward the center, always controlling the workpiece in the circle formed by the support points of the three chucks T. When the steady rest is not in operation, it is in a state of non-contact with the workpiece (as the case may be), at which time the hydraulic cylinder 7 is in an oil discharge state. When the center frame is required to work (the workpiece is clamped on the machine tool), the hydraulic cylinder 7 is controlled by the hydraulic system and is filled with oil into the cylinder body 71, so that the center chuck T on the center slide plate 2 moves to the part where the workpiece is required to be supported, the chucks T of the upper support arm 3 and the lower support arm 3 support the shaft workpiece to be processed, and the center chuck T on the center slide plate 2 supports the workpiece and prevents the workpiece from transversely moving. When the process is performed, as the diameter of the workpiece is continuously reduced, the distance between the chucks T on the two support arms 3 is reduced, and the chucks T on the center slide plate 2 move forward to always bear against the workpiece. The hydraulic valve 9 can stabilize the pressure of the hydraulic cylinder 7.
The preferred embodiments of this invention have been described so far that various changes or modifications may be made by one of ordinary skill in the art without departing from the scope of this invention.
Claims (5)
1. The constant-pressure constant-center multifunctional self-centering center frame comprises a center sliding plate (2) arranged in a mounting seat (1) in a sliding manner and two support arms (3) arranged on the center sliding plate (2), wherein the front ends of the two support arms (3) and the center of the front end surface of the center sliding plate (2) are respectively provided with a chuck (T) for rotatably supporting a workpiece; two guide sliding grooves (2 a) for sliding and assembling corresponding support arms (3) are formed in the central sliding plate (2), and a track pin (4) is fixedly arranged on each support arm (3); a center adjusting mechanism (5) for adjusting the center distance of each support arm (3) is arranged in the mounting seat (1) corresponding to each support arm (3); the rear of the mounting seat (1) is fixedly provided with a hydraulic cylinder (7) which drives the two support arms (3) through the driving center sliding plate (2) to control a workpiece in a circle formed by supporting points of the three chucks (T); the method is characterized in that: a central adjusting block (6) for rolling and supporting the track pin (4) is arranged in the mounting seat (1) corresponding to each support arm (3), and a track groove (G) for forcing the support arm (3) to slide along the guide chute (2 a) when the central sliding plate (2) moves through the constraint track pin (4) is formed between the central adjusting mechanism (5) and the central adjusting block (6);
The two guide sliding grooves (2 a) comprise a left guide sliding groove formed on the left plate surface of the central sliding plate (2) and a right guide sliding groove formed on the right plate surface of the central sliding plate (2), and the left guide sliding groove and the right guide sliding groove are distributed in an X shape on the central sliding plate (2); the two support arms (3) comprise a lower support arm which is arranged in the left guide chute in a sliding way and an upper support arm which is arranged in the right guide chute in a sliding way;
The mounting seat (1) is a flat box body with an opening at the front end, and the flat box body is formed by assembling three side plates and two cover plates; the three side plates comprise an upper side plate (11), a lower side plate (12) and a rear side plate (13), and the two cover plates comprise a left cover plate (14) and a right cover plate (15); an assembly hole (1 a) for installing a center adjusting mechanism (5) and an adjusting cavity (1 b) for installing a center adjusting block (6) are machined in the left cover plate (14) and the right cover plate (15) in a vertically penetrating mode, and the assembly hole (1 a) penetrates through the adjusting cavity (1 b); the center adjusting mechanism (5) for adjusting the lower support arm is arranged in the assembly hole (1 a) of the left cover plate (14), and the center adjusting mechanism (5) for adjusting the upper support arm is arranged in the assembly hole (1 a) of the right cover plate (15);
The center adjusting mechanism (5) consists of an adjusting nut (51), an adjusting rod (52), a center adjusting sliding rail (53), an adjusting rod screw (54) and an adjusting rod sleeve (56); the adjusting rod (52) can be arranged in the assembly hole (1 a) of the cover plate in a vertically movable way, the central adjusting sliding rail (53) is fixedly arranged on the adjusting rod (52) at a position which is positioned in the adjusting cavity (1 b) and can synchronously move along with the adjusting rod (52), the upper end of the adjusting rod (52) extends out of the assembly hole (1 a) and is in spiral connection with the adjusting nut (51), the adjusting rod sleeve (56) is sleeved on the adjusting rod (52), the adjusting rod sleeve (56) is provided with a strip-shaped sliding groove (56 a) for limiting the adjusting rod screw (54) to move along the length of the adjusting rod, and the adjusting rod screw (54) slidably penetrates through the sliding groove and is in spiral solid-phase connection with the adjusting rod (52);
the track pin (4) is sleeved with three annular sleeves (41) in rolling contact fit with the track groove (G), the inclined surface of the track groove (53) is an inward concave inclined surface with an inner groove (53 a) in the middle, and the inclined surface of the center adjusting block (6) is an outward convex inclined surface with an outer convex strip (6 a) formed at the position corresponding to the inner groove (53 a);
The adjusting cavity (1 b) of the cover plate is provided with an elastic pressing mechanism (8) which is used for elastically pressing the central adjusting block (6) to ensure that the annular sleeve (41) can be elastically pressed all the time, the elastic pressing mechanism (8) comprises a spring cushion block (81) and a pressing spring (82) which is pressed between the spring cushion block (81) and the central adjusting block (6), and a spring supporting pin (83) which is used for adjusting the pre-tightening pressure of the pressing spring (82), and a cavity opening cover of the adjusting cavity (1 b) is provided with an adjusting cavity cover (17).
2. The constant pressure constant center multifunctional self-centering bracket as claimed in claim 1, wherein: the cover plate is provided with an installation window which is convenient for installing the adjusting rod screw (54), and an acrylic plate (57) for preventing the adjusting rod sleeve (56) from rotating is clamped on the installation window; the lower orifice of the assembly hole (1 a) is spirally provided with a cover plate plug (16), the adjusting rod (52) is provided with a pre-tightening spring (55), the upper end of the pre-tightening spring (55) positioned in the left cover plate (14) is propped against the lower end of the adjusting rod (52), and the lower end of the pre-tightening spring (55) positioned in the left cover plate (14) is propped against the cover plate plug (16); the pre-tightening spring (55) positioned in the right cover plate (15) is sleeved on the adjusting rod (52), the upper end of the pre-tightening spring (55) is propped against the lower end of the adjusting rod sleeve (56), and the lower end of the pre-tightening spring (55) is propped against the check ring (D) arranged on the adjusting rod (52).
3. The constant pressure constant center multifunctional self-centering bracket as claimed in claim 2, wherein: the cover plate is fixedly provided with an adjusting knob fixing plate (58) matched with the anti-falling clamping sleeve of the adjusting nut (51) at the upper orifice of the assembly hole (1 a), and the upper end of the adjusting nut (51) is fixedly provided with an adjusting knob (59) which is convenient for manually rotating the adjusting nut (51) to drive the adjusting rod (52) to move up and down through a screw.
4. A constant pressure constant center multifunctional self-centering bracket as claimed in claim 3, wherein: an air inlet valve (F) is fixedly arranged on the upper side plate (11), an air inlet channel (11 a) connected with the air inlet valve (F) is processed in the upper side plate (11), and an inner air channel (21) used for communicating the air inlet channel (11 a) with the guide sliding chute (2 a) to enable the guide sliding chute (2 a) to form a static pressure track is processed in the central sliding plate (2); and the rear side plate (13) is also provided with a silencer (Q).
5. The constant pressure constant center multifunctional self-centering bracket as claimed in claim 4, wherein: the cylinder body (71) of the hydraulic cylinder (7) is fixed on the rear side plate (13), and a piston rod (72) of the hydraulic cylinder (7) penetrates through the rear side plate (13) to be connected with the central sliding plate (2); the cylinder body (71) is provided with a hydraulic valve (9) consisting of a valve core body (91), a valve core (92) and a valve core ejector rod (93).
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105364515A (en) * | 2014-08-14 | 2016-03-02 | 美国艾洛宝技术公司 | Adjustable fixture mechanism |
| CN213889041U (en) * | 2020-12-17 | 2021-08-06 | 宁波市精恒凯翔机械有限公司 | Constant-pressure constant-center multifunctional self-centering center frame |
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| AU425908B2 (en) * | 1968-04-10 | 1972-07-10 | Rast Products Pty. Ltd | Improvements in and relating tothe bar feed tubes of lathes |
| EP2505302B1 (en) * | 2011-03-29 | 2014-01-08 | SMW-AUTOBLOK Spannsysteme GmbH | Stationary support |
| US9114490B1 (en) * | 2014-06-30 | 2015-08-25 | Arobotech Systems, Inc. | Adjustable fixture mechanism |
| CN106584136A (en) * | 2016-12-28 | 2017-04-26 | 宁波市精恒凯翔机械有限公司 | Self-centering center frame |
| JP2018144120A (en) * | 2017-03-01 | 2018-09-20 | 株式会社ジェイテクト | Swing stop device and machine tool equipped with the swing stop device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105364515A (en) * | 2014-08-14 | 2016-03-02 | 美国艾洛宝技术公司 | Adjustable fixture mechanism |
| CN213889041U (en) * | 2020-12-17 | 2021-08-06 | 宁波市精恒凯翔机械有限公司 | Constant-pressure constant-center multifunctional self-centering center frame |
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