CN109346032B

CN109346032B - A erection equipment for piano truckle

Info

Publication number: CN109346032B
Application number: CN201811189694.2A
Authority: CN
Inventors: 闫雨; 赵妍
Original assignee: Weifang Engineering Vocational College
Current assignee: Weifang Engineering Vocational College
Priority date: 2018-10-12
Filing date: 2018-10-12
Publication date: 2021-07-23
Anticipated expiration: 2038-10-12
Also published as: CN109346032A

Abstract

The invention relates to the technical field of piano installation, in particular to an installation device for piano caster wheels, which comprises a base, a lifting mechanism, a workpiece clamping assembly, an adjusting assembly, a locking assembly and a pressing assembly, wherein the lifting mechanism is vertically arranged at the top of the base, the workpiece clamping assembly comprises a first supporting block, a first fixing plate, a pressing strip and a fixer, the first supporting block is fixedly connected with one end of the adjusting assembly, the adjusting assembly comprises a first supporting rod, a second supporting rod and a third supporting rod, the locking assembly comprises a locker and a rotating mechanism, and the pressing assembly comprises a supporting table and a rubber presser. The working efficiency is greatly improved.

Description

A erection equipment for piano truckle

Technical Field

The invention relates to the technical field of piano installation, in particular to an installation device for a caster of a piano.

Background

The piano is a keyboard musical instrument in Western classical music, has the name of 'king of musical instrument', consists of 52 white keys of 88 keys, 36 black keys and a metal string soundboard, the Italy person Butuomo-Korea-Crisdori invented the piano in 1709, the range of the piano range is from A027.5Hz to C84186Hz, almost all the tones in the tone system are contained, the piano is a musical instrument with the widest range except for the pipe organ, the piano is generally used for the performances of singleton, rerun, accompaniment and the like, the music composing and the music practice are very convenient, a player pulls a small mallet covered with a flannel in the piano by pressing the keys on the keyboard, then strikes a steel wire string to generate sound, the piano needs the timed nursing to ensure the constant tone color, the prior art piano comprises a caster, a bracket, a central shaft and a shaft sleeve sleeved on the central shaft, the wheel rotates on the bracket, the lower end of the central shaft is fixedly connected with the bracket, be equipped with a ball between the upper end of center pin and the axle sleeve, the center pin rolls through the ball and axle sleeve normal running fit, and the piano of above-mentioned structure is with truckle existence following defect in the use of reality: because the prior caster only depends on a ball to roll in the shaft sleeve, the ball is easy to deviate from a preset central position under the action of the gravity of the piano frame in the moving process of the piano frame, so that the ball is blocked with a central shaft in the shaft sleeve, thereby causing the inconvenience of the movement of the piano, the height of the prior caster can not be adjusted, when the ground is uneven, the height of different casters is required to be adjusted, so that the piano is in a horizontal position, in the installation process of the piano, the installation of the piano is indispensable, because the piano is very heavy and expensive, more importantly, the caster is a favorite of some enthusiasts, most of the prior market can collide with the piano when the caster is installed, and the caster of the piano can not be accurately aligned with the supporting leg of the piano, the use is very inconvenient, and the design of the caster and the piano can be quickly aligned with the supporting leg of the piano according to requirements, not only can prevent colliding with, but also operate very convenient erection equipment.

Disclosure of Invention

In view of the deficiencies of the prior art, the present invention provides a mounting device for piano casters.

The invention discloses a mounting device for a caster wheel of a piano, which comprises a base, a lifting mechanism, a workpiece clamping assembly, an adjusting assembly, a locking assembly and a pressing assembly, wherein the lifting mechanism is vertically arranged at the top of the base, the workpiece clamping assembly comprises a first supporting block, a first fixing plate, a pressing strip and a fixer, the first supporting block is fixedly connected with one end of the adjusting assembly, the first fixing plate is arranged at the top of the first supporting block and is fixedly connected with the first supporting block, the pressing strip is arranged above the first supporting block, the first fixing plate is provided with a first notch in an arc shape, the pressing strip is provided with a second notch in an arc shape, the inner sides of the first notch and the second notch are attached to the outer side of a connecting part of the caster wheel of the piano, the fixer is arranged at the outer side of the pressing strip, the adjusting assembly comprises a first supporting rod, a second supporting rod and a third supporting rod, the first supporting rod is sleeved on the lifting mechanism, the inboard of first bracing piece is provided with the first sliding tray that holds the second bracing piece, the second bracing piece is L shape and the horizontal end of second bracing piece is inserted and is established in first sliding tray, the vertical end of second bracing piece is provided with the second sliding tray, the third bracing piece is L shape and the vertical end of third bracing piece is inserted and is established in the second sliding tray, the horizontal end and the first supporting block fixed connection of third bracing piece, locking Assembly includes locker and slewing mechanism, the locker cover is established on elevating system, slewing mechanism sets up the outside at the locker, compress tightly the squeezer that the subassembly includes brace table and rubber material, the brace table cover is established on elevating system, the squeezer sets up the top at the brace table.

Preferably, the workpiece clamping assembly further comprises a second supporting block, a limiting plate and two guide rods, the second supporting block is arranged at the top of the first supporting block, the two guide rod levels are arranged above the first supporting block, one end of each guide rod is fixedly connected with the first fixing plate, the other end of each guide rod penetrates through the pressing strip and extends to be connected with the limiting plate fixedly, the top of the second supporting block is provided with an arc-shaped groove for accommodating the caster of the piano, and the fixing device is a bolt and a nut.

Preferably, the first support rod and the second support rod are respectively provided with an adjusting locker.

Preferably, the locker is hexagon nut, and slewing mechanism includes internal fixation ring, one-way ratchet and two fixed lids, and one-way ratchet includes ratchet ring, latch and torsional spring, and internal fixation ring sets up in hexagon nut's the outside and internal fixation ring's inner wall and hexagon nut joint, and the outside of ratchet ring setting internal fixation ring, and ratchet ring and the laminating of internal fixation ring are provided with the draw-in groove that holds the latch on internal fixation ring's the outer wall, and the latch setting is in the draw-in groove, the outer wall of latch and the coincidence of internal fixation ring's outer wall, and the torsional spring setting is in the inboard of latch.

Preferably, the two fixed covers are respectively arranged at the top and the bottom of the ratchet ring and the inner fixed ring and are fixedly connected, and the outer wall of the ratchet ring is provided with an insertion hole.

Preferably, the compactor is three sucking discs, the bottom of each sucking disc is provided with a threaded hole for a bolt to pass through, the top of the supporting table is provided with three threaded holes and is just opposite to the threaded hole of each sucking disc, a bolt is arranged in each sucking disc, and a rubber pad is arranged at the top of each bolt.

Preferably, elevating system is the jack, and the top of brace table is provided with brace table stop gear, and brace table stop gear includes gasket and two limit nut, and the gasket setting is in two limit nut's centre, and two limit nut settings are at the top and swing joint of brace table.

Preferably, the two sides of the base are respectively provided with a pulley assembly, the pulley assembly comprises a pulley support rod, a positioning mechanism and two universal wheels, the two ends of the pulley support rod are respectively provided with a third support block, the third support blocks are fixedly connected with the base, and the two universal wheels are arranged on the pulley support rod and hinged to the pulley support rod.

Preferably, the positioning mechanism comprises a first movable block and a second movable block, the first movable block is arranged in a horizontal state, a fourth support rod is arranged at one end of the first movable block, the first movable block is hinged to the fourth support rod, a fourth support block is arranged at each of two ends of the fourth support rod, the second movable block is arranged in a vertical state, a fifth support rod is arranged on one side, close to the base, of the second movable block, the fifth support rod is hinged to the second movable block, and the fifth support rod is fixedly connected with the base.

Preferably, the pulley support rod is provided with a turnover plate, and the turnover plate is fixedly connected with the pulley support rod.

Has the advantages that: the invention relates to a mounting device for piano caster, which is characterized in that when in use, the piano caster is placed on a second supporting block, a connecting part on the piano caster is placed at a second notch on a first fixing plate, the outer wall of the connecting part of the piano caster is attached to the second notch, a pressing strip is pushed to the first fixing plate through a guide rod, when the first notch is attached to the outer wall of the connecting part of the piano caster, the pressing strip is connected with the first fixing plate through the threaded fit of a bolt and a nut, when the piano caster is taken out, the bolt is loosened, the pressing strip slides through the guide rod so as to be far away from the first fixing plate, the pressing strip cannot be separated from the guide rod through a limiting plate, three adjusting components and workpiece clamping components are sleeved on a lifting mechanism and are attached and overlapped with each other, the three locking components are in the same structure, one locking component is positioned at the bottom of a supporting table, and the other two locking components are respectively positioned at the top of the first supporting table and the last locking component, when the lifting mechanism is lifted to a proper height, the workpiece clamping assembly can deviate from supporting legs of a piano, the distance between the workpiece clamping assembly and the piano supporting legs needs to be adjusted by the first supporting rod, the heights of the workpiece clamping assembly and the piano supporting legs need to be adjusted by the second supporting rod, the piano caster and the piano supporting legs are accurately positioned by adjusting the distance and the height, and when the supporting platform and the first supporting rod are adjusted to the proper height on the lifting mechanism, the supporting platform and the first supporting rod are fixed by the hexagonal nut and the rotating mechanism, generally, the hexagonal nut is troublesome to rotate manually, the efficiency is low, when the supporting platform and the first supporting rod pass through the one-way ratchet wheel, the working efficiency is effectively improved, the time and the labor are saved, cylindrical tools such as crowbars or steel pipes are inserted into the inserting holes, the supporting platform and the three first supporting rods are rapidly fixed by the principle of the one-way ratchet wheel, when the lifting mechanism is lifted to drive the supporting platform to ascend, thereby driving the three suckers until the three suckers prop against the bottom of the piano, effectively preventing bolts from colliding with the bottom of the piano through rubber pads when the three suckers prop against the bottom of the piano, tightly pressing the supporting table and the locking component through the limiting mechanism of the supporting table, thereby preventing the supporting table from shaking, and being inconvenient to move the whole equipment, the whole equipment is very convenient to move and improving the working efficiency through the universal wheel at the bottom of the base, when the equipment is moved to a proper position, the universal wheel is lifted up through the pulley supporting rod, and is rotated through the fourth supporting block after being lifted up to be adjusted to the outer side of the universal wheel, and then the fourth supporting block is blocked by the fourth supporting rod, so that the universal wheel cannot rotate on the pulley supporting rod, and the universal wheel is conveniently lifted up or put down through the turnover plate, the mounting equipment for the caster of the piano not only can avoid the problem that the caster of the piano can collide when being mounted, the device is convenient to operate and can be quickly moved to a designated position, so that the working efficiency is greatly improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a first schematic perspective view of an embodiment;

FIG. 2 is a second schematic perspective view of an embodiment;

FIG. 3 is a top view of the embodiment;

FIG. 4 is an exploded perspective view of the locking assembly of the embodiment;

FIG. 5 is an exploded perspective view of the latch and the torsion spring according to the embodiment;

FIG. 6 is an exploded perspective view of an embodiment of an adjustment assembly;

fig. 7 is a perspective view of a sheave assembly according to an embodiment;

FIG. 8 is a perspective view of the workpiece clamping assembly in an embodiment;

FIG. 9 is a top view of the workpiece clamping assembly in an embodiment;

FIG. 10 is a schematic view of the workpiece clamping assembly clamping piano casters of the embodiment;

FIG. 11 is a schematic view of an installation in an embodiment;

description of reference numerals: the device comprises a base 1, a first supporting block 2, a first fixing plate 3, a pressing strip 4, a first notch 5, a second notch 6, a first supporting rod 7, a second supporting rod 8, a third supporting rod 9, a first sliding groove 10, a second sliding groove 11, a supporting table 12, a second supporting block 13, a limiting plate 14, a guide rod 15, an arc-shaped groove 16, an adjusting locker 17, a hexagon nut 18, an inner fixing ring 19, a one-way ratchet 20, a fixing cover 21, a ratchet ring 22, a latch 23, a torsion spring 24, a clamping groove 25, a jack 26, a suction cup 27, a rubber pad 28, a jack 29, a gasket 30, a limiting nut 31, a pulley supporting rod 32, a universal wheel 33, a third supporting block 34, a first moving block 35, a second moving block 36, a fourth supporting rod 37, a fourth supporting block 38, a fifth supporting rod 39 and a turnover plate 40.

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

Referring to fig. 1 to 11, the mounting device for the caster of the piano comprises a base 1, an elevating mechanism, a workpiece clamping assembly, an adjusting assembly, a locking assembly and a pressing assembly, wherein the elevating mechanism is vertically arranged at the top of the base 1, the workpiece clamping assembly comprises a first supporting block 2, a first fixing plate 3, a pressing strip 4 and a fixer, the first supporting block 2 is fixedly connected with one end of the adjusting assembly, the first fixing plate 3 is arranged at the top of the first supporting block 2 and is fixedly connected with the top of the first supporting block 2, the pressing strip 4 is arranged above the first supporting block 2, a first notch 5 in an arc shape is arranged on the first fixing plate 3, a second notch 6 in an arc shape is arranged on the pressing strip 4, the inner sides of the first notch 5 and the second notch 6 are attached to the outer side of the connecting part of the caster of the piano, the fixer is arranged on the outer side of the pressing strip 4, the adjusting assembly comprises a first supporting rod 7, Second bracing piece 8 and third bracing piece 9, first bracing piece 7 cover is established on elevating system, the inboard of first bracing piece 7 is provided with the first sliding tray 10 that holds second bracing piece 8, second bracing piece 8 is L shape and the horizontal end of second bracing piece 8 is inserted and is established in first sliding tray 10, the vertical end of second bracing piece 8 is provided with second sliding tray 11, third bracing piece 9 is L shape and the vertical end of third bracing piece 9 is inserted and is established in second sliding tray 11, the horizontal end and the 2 fixed connection of first bracing piece of third bracing piece 9, locking assembly includes locker and slewing mechanism, the locker cover is established on elevating system, slewing mechanism sets up the outside at the locker, it includes the compactor of brace table 12 and rubber material to compress tightly the subassembly, brace table 12 cover is established on elevating system, the compactor sets up the top at brace table 12.

Workpiece clamping subassembly is still including second supporting shoe 13, limiting plate 14 and two guide bars 15, second supporting shoe 13 sets up the top at first supporting shoe 2, two guide bar 15 levels set up the top at first supporting shoe 2, the one end and the 3 fixed connection of first fixed plate of every guide bar 15, the other end of guide bar 15 all runs through compressing tightly strip 4 and extending end and limiting plate 14 fixed connection, the top of second supporting shoe 13 is provided with the arc wall 16 that supplies the piano truckle to hold, the fixer is bolt and nut. When the piano caster is used, the piano caster is placed on the second supporting block 13, the connecting part on the piano caster is placed at the second notch 6 on the first fixing plate 3, the outer wall of the connecting part of the piano caster is attached to the second notch 6, the pressing strip 4 is pushed to the first fixing plate 3 through the guide rod 15, when the first notch 5 is attached to the outer wall of the connecting part of the piano caster, the pressing strip 4 is connected with the first fixing plate 3 through the threaded fit of a bolt and a nut, when the piano caster is taken out, the bolt is loosened, the pressing strip 4 slides through the guide rod 15 and is far away from the first fixing plate 3, the pressing strip 4 cannot be separated from the guide rod 15 through the limiting plate 14, the lifting mechanism is sleeved with three adjusting assemblies and workpiece clamping assemblies and is attached to and overlapped, the three locking assemblies are identical in structure, one of the locking assemblies is positioned at the bottom of the supporting table 12, and the other two locking assemblies are respectively positioned at the top of the first adjusting assembly and the bottom of the last adjusting assembly.

The first support rod 7 and the second support rod 8 are respectively provided with an adjusting locking device 17. When the lifting mechanism is lifted to a proper height, the workpiece clamping assembly can deviate from the supporting leg of the piano, the distance between the workpiece clamping assembly and the piano supporting leg needs to be adjusted by the first supporting rod 7, the height between the workpiece clamping assembly and the piano supporting leg needs to be adjusted by the second supporting rod 8, and the piano caster wheel and the piano supporting leg are accurately positioned by adjusting the distance and the height.

The locker is hex nut 18, slewing mechanism includes internal fixation ring 19, one-way ratchet 20 and two fixed lids 21, one-way ratchet 20 includes ratchet ring 22, latch 23 and torsional spring 24, internal fixation ring 19 sets up in hex nut 18's the outside and internal fixation ring 19's inner wall and hex nut 18 joint, fixed ring 19's the outside including ratchet ring 22 sets up, ratchet ring 22 and internal fixation ring 19 laminate, be provided with the draw-in groove 25 that holds latch 23 on internal fixation ring 19's the outer wall, latch 23 sets up in draw-in groove 25, latch 23's outer wall and internal fixation ring 19's outer wall coincidence, torsional spring 24 sets up the inboard at latch 23. When the supporting table 12 and the first supporting rod 7 are adjusted to a proper height on the lifting mechanism, the supporting table 12 and the first supporting rod 7 are fixed through the hexagonal nut 18 and the rotating mechanism, the hexagonal nut 18 is usually manually rotated to be more troublesome, the efficiency is low, and when the supporting table and the first supporting rod are rotated through the one-way ratchet 20, the working efficiency is effectively improved, and time and labor are saved.

The two fixing covers 21 are respectively arranged at the top and the bottom of the ratchet ring 22 and the inner fixing ring 19 and are fixedly connected, and the outer wall of the ratchet ring 22 is provided with an insertion hole 26. A cylindrical tool such as a crowbar or a steel pipe is inserted into the insertion hole 26, and the support base 12 and the three first support rods 7 are quickly fixed by the principle of the one-way ratchet 20.

The compactor is three sucking discs 27, the bottom of each sucking disc 27 is provided with a threaded hole for a bolt to pass through, the top of the support table 12 is provided with three threaded holes and is just opposite to the threaded hole of each sucking disc 27, a bolt is arranged in each sucking disc 27, and a rubber pad 28 is arranged at the top of the bolt. When the lifting mechanism is lifted up to drive the supporting platform 12 to ascend, the three suckers 27 are driven until the three suckers 27 abut against the bottom of the piano, and when the three suckers 27 abut against, the rubber pads 28 effectively prevent the bolts from colliding with the bottom of the piano.

Elevating system is jack 29, and the top of brace table 12 is provided with brace table stop gear, and brace table stop gear includes gasket 30 and two limit nut 31, and gasket 30 sets up in the centre of two limit nut 31, and two limit nut 31 set up at the top of brace table 12 and swing joint. The support table 12 and the locking assembly are pressed tightly through the support table limiting mechanism, so that the support table 12 cannot shake.

The pulley components are arranged on two sides of the base 1 respectively and comprise a pulley supporting rod 32, a positioning mechanism and two universal wheels 33, a third supporting block 34 is arranged at each of two ends of the pulley supporting rod 32, the third supporting blocks 34 are fixedly connected with the base 1, and the two universal wheels 33 are arranged on the pulley supporting rod 32 and hinged to each other. It is very inconvenient to remove whole equipment, through universal wheel 33 of base 1 bottom, it is very convenient and promoted work efficiency to remove whole equipment.

The positioning mechanism comprises a first movable block 35 capable of rotating and a second movable block 36 capable of rotating, the first movable block 35 is arranged in a horizontal state, a fourth supporting rod 37 is arranged at one end of the first movable block 35, the first movable block 35 is hinged to the fourth supporting rod 37, a fourth supporting block 38 is arranged at each of two ends of the fourth supporting rod 37, a fifth supporting rod 39 is arranged on one side, close to the base 1, of the second movable block 36 in a vertical state, the fifth supporting rod 39 is hinged to the second movable block 36, and the fifth supporting rod 39 is fixedly connected with the base 1. When the device moves to a proper position, the universal wheel 33 is lifted through the pulley support rod 32, and after being lifted, the universal wheel is rotated through the fourth support block 38 and adjusted to the outer side of the universal wheel 33, and then the fourth support block 38 is blocked by the fourth support rod 37, so that the universal wheel 33 cannot rotate on the pulley support rod 32.

The pulley support rod 32 is provided with a turnover plate 40, and the turnover plate 40 is fixedly connected with the pulley support rod 32. It is convenient to raise or lower the caster wheels 33 by the flipping board 40.

The working principle is as follows: when in use, the piano caster is placed on the second supporting block 13, the connecting part on the piano caster is placed at the second gap 6 on the first fixing plate 3, the outer wall of the connecting part of the piano caster is attached to the second gap 6, the pressing strip 4 is pushed to the first fixing plate 3 through the guide rod 15, when the first gap 5 is attached to the outer wall of the connecting part of the piano caster, the pressing strip 4 is connected with the first fixing plate 3 through the thread fit of the bolt and the nut, when the piano caster is taken out, the bolt is loosened, the pressing strip 4 slides through the guide rod 15 so as to be far away from the first fixing plate 3, the pressing strip 4 can not be separated from the guide rod 15 through the limiting plate 14, the lifting mechanism is sleeved with three adjusting components and workpiece clamping components which are attached and overlapped with each other, the three locking components are identical in structure, one of the locking components is positioned at the bottom of the supporting table 12, the other two locking components are respectively positioned at the top of the first adjusting component and the bottom, when the lifting mechanism is lifted to a proper height, the workpiece clamping component can deviate from the supporting leg of the piano, the first supporting rod 7 needs to adjust the distance between the workpiece clamping component and the supporting leg of the piano, the second supporting rod 8 needs to adjust the height between the workpiece clamping component and the supporting leg of the piano, the caster wheel of the piano and the supporting leg of the piano are accurately positioned by adjusting the distance and the height, when the supporting table 12 and the first supporting rod 7 are adjusted to a proper height on the lifting mechanism, the supporting table 12 and the first supporting rod 7 are fixed through the hexagonal nut 18 and the rotating mechanism, generally, the hexagonal nut 18 is troublesome to rotate manually, the efficiency is low, when the working efficiency is effectively improved through the one-way ratchet wheel 20, the time and the labor are saved, a crowbar or a steel pipe and other cylindrical tools are inserted into the insertion hole 26, and the supporting table 12 and the three first supporting rods 7 are rapidly fixed through the principle of the one-way ratchet wheel 20, when the lifting mechanism is lifted to drive the supporting platform 12 to rise, the three suction cups 27 are driven, until the three suction cups 27 are pressed against the bottom of the piano, when the three suckers 27 are propped against, the rubber pads 28 effectively prevent the bolts from colliding with the bottom of the piano, the supporting platform 12 and the locking component are pressed tightly through the supporting platform limiting mechanism, thereby the supporting table 12 can not shake, the whole equipment is inconvenient to move, the whole equipment is very convenient to move and the working efficiency is improved through the universal wheels 33 at the bottom of the base 1, when the equipment moves to a proper position, the universal wheel 33 is lifted through the pulley support rod 32, the lifted universal wheel is rotated through the fourth support block 38 and is adjusted to the outer side of the universal wheel 33, the fourth support block 38 is blocked by the fourth support rod 37, the universal wheel 33 cannot rotate on the pulley support rod 32, and the universal wheel 33 is conveniently lifted or put down through the turnover plate 40.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A mounting device for piano casters, characterized in that: comprises a base (1), a lifting mechanism, a workpiece clamping assembly, an adjusting assembly, a locking assembly and a pressing assembly, wherein the lifting mechanism is vertically arranged at the top of the base (1), the workpiece clamping assembly comprises a first supporting block (2), a first fixing plate (3), a pressing strip (4) and a fixer, the first supporting block (2) is fixedly connected with one end of the adjusting assembly, the first fixing plate (3) is arranged at the top of the first supporting block (2) and is fixedly connected with the first supporting block, the pressing strip (4) is arranged above the first supporting block (2), a first notch (5) in an arc shape is arranged on the first fixing plate (3), a second notch (6) in an arc shape is arranged on the pressing strip (4), the inner sides of the first notch (5) and the second notch (6) are attached to the outer side of a piano caster connecting part, the fixer is arranged on the outer side of the pressing strip (4), the adjusting component comprises a first supporting rod (7), the supporting device comprises a second supporting rod (8) and a third supporting rod (9), wherein the first supporting rod (7) is sleeved on the lifting mechanism, a first sliding groove (10) for accommodating the second supporting rod (8) is formed in the inner side of the first supporting rod (7), the second supporting rod (8) is L-shaped, the horizontal end of the second supporting rod (8) is inserted into the first sliding groove (10), a second sliding groove (11) is formed in the vertical end of the second supporting rod (8), the third supporting rod (9) is L-shaped, the vertical end of the third supporting rod (9) is inserted into the second sliding groove (11), the horizontal end of the third supporting rod (9) is fixedly connected with a first supporting block (2), the pressing assembly comprises a supporting table (12) and a rubber compressor, the supporting table (12) is sleeved on the lifting mechanism, and the compressor is arranged at the top of the supporting table (12);

three adjusting assemblies and workpiece clamping assemblies are sleeved on the lifting mechanism and are mutually attached and superposed, the three locking assemblies are of the same structure, one of the locking assemblies is positioned at the bottom of the supporting table (12), and the other two locking assemblies are respectively positioned at the top of the first adjusting assembly and the bottom of the last adjusting assembly; the locking assembly comprises a locker and a rotating mechanism, the locker is sleeved on the lifting mechanism, and the rotating mechanism is arranged on the outer side of the locker.

2. A mounting apparatus for piano casters according to claim 1, wherein: the workpiece clamping assembly is characterized by further comprising a second supporting block (13), a limiting plate (14) and two guide rods (15), the second supporting block (13) is arranged at the top of the first supporting block (2), the two guide rods (15) are horizontally arranged above the first supporting block (2), one end of each guide rod (15) is fixedly connected with the first fixing plate (3), the other end of each guide rod (15) penetrates through the pressing strip (4) and extends the end to be fixedly connected with the limiting plate (14), the top of the second supporting block (13) is provided with an arc-shaped groove (16) for containing the piano caster, and the fixing device is a bolt and a nut.

3. A mounting apparatus for piano casters according to claim 2, wherein: the first supporting rod (7) and the second supporting rod (8) are respectively provided with an adjusting locking device (17).

4. A mounting apparatus for piano casters according to claim 1, wherein: the locking device is hexagonal nut (18), slewing mechanism includes interior solid fixed ring (19), one-way ratchet (20) and two fixed lids (21), one-way ratchet (20) are including ratchet ring (22), latch (23) and torsional spring (24), interior solid fixed ring (19) set up in the outside of hexagonal nut (18) and the inner wall and the hexagonal nut (18) joint of interior solid fixed ring (19), the outside of solid fixed ring (19) including ratchet ring (22) set up, ratchet ring (22) and interior solid fixed ring (19) laminating, be provided with draw-in groove (25) that hold latch (23) on the outer wall of interior solid fixed ring (19), latch (23) set up in draw-in groove (25), the outer wall of latch (23) and the outer wall coincidence of interior solid fixed ring (19), torsional spring (24) set up the inboard at latch (23).

5. A mounting device for piano casters according to claim 4, wherein: two fixed covers (21) are respectively arranged at the top and the bottom of the ratchet ring (22) and the inner fixing ring (19) and are fixedly connected, and the outer wall of the ratchet ring (22) is provided with an insertion hole (26).

6. A mounting apparatus for piano casters according to claim 1, wherein: the compactor is three sucking discs (27), the bottom of each sucking disc (27) is provided with a threaded hole for a bolt to pass through, the top of the support table (12) is provided with three threaded holes and is just opposite to the threaded hole of each sucking disc (27), a bolt is arranged in each sucking disc (27), and a rubber pad (28) is arranged at the top of the bolt.

7. A mounting device for piano casters according to claim 6, wherein: elevating system is jack (29), and the top of brace table (12) is provided with brace table stop gear, and brace table stop gear includes gasket (30) and two limit nut (31), and gasket (30) set up in the centre of two limit nut (31), and two limit nut (31) set up at the top and swing joint of brace table (12).

8. A mounting apparatus for piano casters according to claim 1, wherein: the pulley assembly is arranged on each of two sides of the base (1) and comprises a pulley supporting rod (32), a positioning mechanism and two universal wheels (33), a third supporting block (34) is arranged at each of two ends of the pulley supporting rod (32), the third supporting blocks (34) are fixedly connected with the base (1), and the two universal wheels (33) are arranged on the pulley supporting rods (32) and hinged to each other.

9. A mounting apparatus for piano casters according to claim 8, wherein: the positioning mechanism comprises a first movable block (35) and a second movable block (36), the first movable block (35) can rotate, a fourth supporting rod (37) is arranged at one end of the first movable block (35) in a horizontal state, the first movable block (35) is hinged to the fourth supporting rod (37), a fourth supporting block (38) is arranged at each of two ends of the fourth supporting rod (37), the second movable block (36) is arranged in a vertical state and is provided with a fifth supporting rod (39) close to one side of the base (1), the fifth supporting rod (39) is hinged to the second movable block (36), and the fifth supporting rod (39) is fixedly connected with the base (1).

10. A mounting device for piano casters according to claim 9, wherein: the pulley supporting rod (32) is provided with a turnover plate (40), and the turnover plate (40) is fixedly connected with the pulley supporting rod (32).