CN112846828B - Support span adjusting device for rotating assembly and machine tool - Google Patents
Support span adjusting device for rotating assembly and machine tool Download PDFInfo
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- CN112846828B CN112846828B CN202011457218.1A CN202011457218A CN112846828B CN 112846828 B CN112846828 B CN 112846828B CN 202011457218 A CN202011457218 A CN 202011457218A CN 112846828 B CN112846828 B CN 112846828B
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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
Abstract
The invention relates to a support span adjusting device and a machine tool for a rotating assembly, the support span adjusting device comprising: the execution unit is arranged on the bearing assembly and comprises a first telescopic assembly, a second telescopic assembly, a third telescopic assembly and/or a fourth telescopic assembly, wherein the first telescopic assembly can push the left bearing assembly to slide rightwards when extending out; and the control unit is connected with the first telescopic assembly, the second telescopic assembly, the third telescopic assembly and/or the fourth telescopic assembly and can at least control the extending movement of the telescopic assemblies. The support span adjusting device can solve the problem that the support span of the rotating assembly is difficult to adjust, so that the service life of the rotating assembly is prolonged, and the support span of the machine tool is prevented from being influenced by the improper support span.
Description
Technical Field
The invention belongs to the technical field of machine tools, and particularly relates to a support span adjusting device for a rotating assembly and a machine tool.
Background
A rotating assembly represented by a machine tool spindle includes a carrier assembly, left and right bearing assemblies provided in the carrier assembly and spaced apart in the left-right direction, and a rotating shaft fitted into the left and right bearing assemblies in the left-right direction. In the rotating assembly, the relative distance between the left bearing assembly and the right bearing assembly is called as the support span, the support span is an important parameter influencing the rigidity performance and the shock resistance performance of the rotating assembly, the service life of the rotating assembly is easily reduced once the support span of the rotating assembly is improper, and even the machining quality and the production efficiency of a machine tool are directly influenced. However, when the rotational speed of the rotating assembly is different, the heat generated by rotation is different, so that the supporting rigidity of the rotating assembly at different rotational speeds is different, the applicable supporting span is also different, and the phenomenon that the service life of the rotating assembly is shortened or even the machining quality of the machine tool is influenced due to the improper supporting span in the rotating process of the rotating assembly occurs occasionally, so that a device capable of adjusting the supporting span of the rotating assembly is urgently needed.
Disclosure of Invention
In order to solve all or part of the above problems, the present invention provides a spindle of a machine tool, which is used for solving the problem that the support span of a rotating assembly is difficult to be adjusted, so as to prolong the service life of the rotating assembly and avoid the influence on the machining quality and the production efficiency of the machine tool caused by the improper support span.
According to a first aspect of the present invention, there is provided a support span adjustment apparatus for a rotating assembly including a carrier assembly, left and right bearing assemblies provided in the carrier assembly and spaced apart in a left-right direction, and a rotating shaft fitted into the left and right bearing assemblies in the left-right direction, the support span adjustment apparatus comprising: the execution unit is arranged on the bearing assembly and comprises a first telescopic assembly, a second telescopic assembly, a third telescopic assembly and/or a fourth telescopic assembly, wherein the first telescopic assembly can be used for pushing the left bearing assembly to slide rightwards relative to the rotating shaft and the bearing assembly when extending out, the second telescopic assembly can be used for pushing the left bearing assembly to slide leftwards relative to the rotating shaft and the bearing assembly when extending out, the third telescopic assembly can be used for pushing the right bearing assembly to slide rightwards relative to the rotating shaft and the bearing assembly when extending out, and/or the fourth telescopic assembly can be used for pushing the right bearing assembly to slide leftwards relative to the rotating shaft and the bearing assembly when extending out; and the control unit is connected with the first telescopic assembly, the second telescopic assembly, the third telescopic assembly and/or the fourth telescopic assembly and can at least control the extension movement of the first telescopic assembly, the second telescopic assembly, the third telescopic assembly and/or the fourth telescopic assembly.
Furthermore, the first telescopic assembly, the second telescopic assembly, the third telescopic assembly and the fourth telescopic assembly are hydraulic control type telescopic assemblies, the control unit comprises an oil tank, a first oil pump connected with the oil tank, a second oil pump connected with the oil tank, a first reversing valve and a second reversing valve, wherein the first reversing valve and the second reversing valve are all O-shaped three-position four-way reversing valves, an oil inlet of the first reversing valve is communicated with the oil tank, an oil supply port of the first reversing valve is communicated with the first oil pump, two working ports of the first reversing valve are respectively communicated with the first telescopic assembly and the second telescopic assembly, an oil inlet of the second reversing valve is communicated with the oil tank, an oil supply port of the second reversing valve is communicated with the second oil pump, and two working ports of the second reversing valve are respectively communicated with the third telescopic assembly and the fourth telescopic assembly.
Furthermore, the number of first loops formed by the first oil pump, the first telescopic assembly, the second telescopic assembly, the first reversing valve and the oil tank is two, in one first loop, the first telescopic assembly and the second telescopic assembly are respectively abutted against outer ring areas of bearings on two sides of the left bearing assembly, and in the other first loop, the first telescopic assembly and the second telescopic assembly are respectively abutted against inner ring areas of bearings on two sides of the left bearing assembly;
the number of second return circuits that constitute jointly by second oil pump, third flexible subassembly, fourth flexible subassembly and second switching-over valve and oil tank is two at least in one in the second return circuit, third flexible subassembly and fourth flexible subassembly respectively with the bearing inner race district of the both sides of right bearing assembly is held against, in another in the second return circuit, third flexible subassembly and fourth flexible subassembly respectively with the bearing inner race district of the both sides of right bearing assembly holds against.
Further, the first loop comprises a first flow meter, a first pressure meter and a first overflow valve which are arranged between the first oil pump and the first reversing valve, and the second loop comprises a second flow meter, a second pressure meter and a second overflow valve which are arranged between the second oil pump and the second reversing valve.
Further, the carrier assembly is including holding the barrel of pivot, with the one end of barrel links to each other and the cover is established change epaxial first end cover and fixed establishing in the barrel and establish the first backstop ring of pivot, left side bearing assembly establishes in the barrel and be located between first backstop ring and the first end cover, first flexible subassembly is established on the first end cover and through establishing first water conservancy diversion passageway on first end cover and the barrel with first switching-over valve is linked together, the flexible subassembly of second is established on the first backstop ring and through establishing on the first backstop ring and the barrel second water conservancy diversion passageway with first switching-over valve is linked together.
Further, the carrier assembly include with the other end of barrel links to each other and the cover is established change epaxial second end cover, the second end cover include with the annular body that the barrel links to each other and establish the second backstop ring of one side of annular body with establish the third backstop ring of the opposite side of annular body, right side bearing assembly establishes in the barrel and be located between second backstop ring and the third backstop ring, the flexible subassembly of third is established on the second backstop ring and through establishing on the second backstop ring and the annular body third water conservancy diversion passageway with the second switching-over valve is linked together, the flexible subassembly of fourth is established on the third backstop ring and through establishing on the third backstop ring and the annular body fourth water conservancy diversion passageway with the second switching-over valve is linked together.
Furthermore, the rotating assembly further comprises a motor stator arranged on the inner wall of the barrel and a motor rotor fixedly arranged on the rotating shaft.
Furthermore, each hydraulic control type telescopic assembly comprises an annular cavity arranged on the bearing assembly, an annular piston arranged in the annular cavity and a pushing ring fixedly arranged on the annular piston and abutted against the side part of the left bearing assembly or the right bearing assembly.
Further, the left bearing assembly includes two or three juxtaposed adjacent ball bearings, and the right bearing assembly includes two or three juxtaposed adjacent ball bearings.
According to a second aspect of the present invention, there is provided a machine tool comprising a rotating assembly and a support span adjustment device for use on the rotating assembly according to the first aspect of the present invention, wherein the rotating shaft of the rotating assembly is a spindle.
It can be known from the above technical solutions that the support span adjusting device for a rotating assembly provided by the present invention mainly comprises an execution unit and a control unit, wherein the execution unit comprises a first telescopic assembly, a second telescopic assembly, a third telescopic assembly and/or a fourth telescopic assembly, and can make the telescopic assemblies perform extension movement under the control of the control unit and push a left bearing assembly and/or a right bearing assembly, so as to change the support span of the rotating assembly in a manner of changing the distance between the left bearing assembly and the right bearing assembly, which not only can prolong the service life of the rotating assembly, but also can avoid the influence on the machining quality and the production efficiency of a machine tool due to improper support span, and in addition, the support span adjusting device for a rotating assembly of the present invention also allows an operator to directly adjust the support span of the rotating assembly when the rotating assembly resonates, thereby reducing damage to the rotating assembly caused by resonance.
The machine tool of the second aspect of the present invention has a function of reducing damage to the rotating assembly (main spindle) and the product to be processed due to resonance by allowing an operator to directly adjust the support span of the rotating assembly when the rotating assembly resonates, by including or using the support span adjusting apparatus for a rotating assembly according to the first aspect of the present invention, that is, by changing the support span of the rotating assembly in such a manner that the distance between the left bearing assembly and the right bearing assembly is changed, which not only can prolong the service life of the rotating assembly, but also can prevent the influence on the processing quality and the production efficiency of the machine tool due to the inappropriate support span.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the figure:
fig. 1 schematically shows a state diagram of use of a support span adjustment apparatus according to an embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is an enlarged view of FIG. 1 at B;
fig. 4 is an enlarged view of fig. 1 at C.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
Fig. 1 schematically shows a state diagram of the use of the support span adjustment apparatus according to the embodiment of the present invention. Fig. 2 is an enlarged view of a portion a in fig. 1. Fig. 3 is an enlarged view of fig. 1 at B. As shown in fig. 1, 2 and 3, the support span adjusting apparatus 100 according to the embodiment of the present invention is applied to a rotating assembly 200. The rotating assembly 200 mainly includes a carrier assembly 21, left and right bearing assemblies 22 and 23 provided in the carrier assembly 21 and spaced apart in the left-right direction, and a rotating shaft 24 fitted into the left and right bearing assemblies 22 and 23 in the left-right direction. The rotating assembly 200 is preferably a spindle assembly of a machine tool, the axis of rotation of which is the spindle of the machine tool.
In the present embodiment, the support span adjusting apparatus 100 for the rotating assembly 200 mainly includes an executing unit 1 and a control unit 2. The execution unit 1 is arranged on the bearing component 21 and comprises a first telescopic component 11 which can push the left bearing component 22 to slide rightwards relative to the rotating shaft 24 and the bearing component 21 when extending, a second telescopic component 12 which can push the left bearing component 22 to slide leftwards relative to the rotating shaft 24 and the bearing component 21 when extending, a third telescopic component 13 which can push the right bearing component 23 to slide rightwards relative to the rotating shaft 24 and the bearing component 21 when extending and/or a fourth telescopic component 14 which can push the right bearing component 23 to slide leftwards relative to the rotating shaft 24 and the bearing component 21 when extending. The control unit 2 is connected with the first telescopic assembly 11, the second telescopic assembly 12, the third telescopic assembly 13 and/or the fourth telescopic assembly 14, and can at least control the extending movement of the first telescopic assembly 11, the second telescopic assembly 12, the third telescopic assembly 13 and/or the fourth telescopic assembly 14, and push the left bearing assembly 22 and/or the right bearing assembly 23 corresponding to the first telescopic assembly to the left or the right, so as to change the supporting span of the rotating assembly 200, which not only can prolong the service life of the rotating assembly, but also can avoid the influence on the processing quality and the production efficiency of the machine tool due to the improper supporting span. In addition, the support span adjustment apparatus 100 for a rotating assembly according to an embodiment of the present invention also allows an operator to directly adjust the support span of the rotating assembly 200 when the rotating assembly 200 resonates, thereby reducing damage to the rotating assembly 200 due to the resonation.
For example, when the support span is too large, the execution unit 1 can selectively control the first telescopic assembly 11 to extend and push the left bearing assembly 22 to slide rightward relative to the rotating shaft 24 and the bearing assembly 21, so that the distance between the left bearing assembly 22 and the right bearing assembly 23 is reduced, and the purpose of reducing the support span of the rotating assembly 200 is achieved; the fourth telescopic assembly 14 can also be selectively controlled to extend and push the right bearing assembly 23 to slide leftwards relative to the rotating shaft 24 and the bearing assembly 21, so that the distance between the left bearing assembly 22 and the right bearing assembly 23 is reduced, and the purpose of reducing the supporting span of the rotating assembly 200 is achieved. The execution unit 1 can also selectively control the first telescopic assembly 11 to extend and push the left bearing assembly 22 to slide rightwards relative to the rotating shaft 24 and the bearing assembly 21, and the fourth telescopic assembly 14 to extend and push the right bearing assembly 23 to slide leftwards relative to the rotating shaft 24 and the bearing assembly 21, so that the distance between the left bearing assembly 22 and the right bearing assembly 23 is reduced, and the purpose of reducing the supporting span of the rotating assembly 200 is achieved.
When the supporting span is too small, the execution unit 1 can selectively control the second telescopic assembly 12 to extend and push the left bearing assembly 22 to slide leftwards relative to the rotating shaft 24 and the bearing assembly 21, so that the distance between the left bearing assembly 22 and the right bearing assembly 23 is increased, and the purpose of increasing the supporting span of the rotating assembly 200 is achieved; and/or, the third telescopic assembly 13 is controlled to extend and push the right bearing assembly 23 to slide rightwards relative to the rotating shaft 24 and the bearing assembly 21, so that the distance between the left bearing assembly 22 and the right bearing assembly 23 is increased, and the purpose of increasing the supporting span of the rotating assembly 200 is achieved.
The execution unit 1 preferably includes a first telescopic assembly 11, a second telescopic assembly 12, a third telescopic assembly 13 and a fourth telescopic assembly 14, and the first telescopic assembly 11, the second telescopic assembly 12, the third telescopic assembly 13 and the fourth telescopic assembly 14 can be selected to be linear driving structures, such as a hydraulic control type telescopic assembly or an electric screw rod. In the preferred embodiment shown in fig. 1, first telescoping assembly 11, second telescoping assembly 12, third telescoping assembly 13, and fourth telescoping assembly 14 are all hydraulically-controlled telescoping assemblies. The control unit 2 includes a tank, a first oil pump 22a connected to the tank, a second oil pump 22b connected to the tank, and a first direction changing valve 23a and a second direction changing valve 23 b. The first change valve 23a and the second change valve 23b are both O-shaped three-position four-way change valves, wherein the oil inlet of the first change valve 23a is communicated with the oil tank, the oil supply port thereof is communicated with the first oil pump 22a, the two working ports thereof are respectively communicated with the first telescopic assembly 11 and the second telescopic assembly 12, the oil inlet of the second change valve 23b is communicated with the oil tank, the oil supply port thereof is communicated with the second oil pump 22b, and the two working ports thereof are respectively communicated with the third telescopic assembly 13 and the fourth telescopic assembly 14. Wherein, at least a first oil pump 22a, a first telescopic assembly 11, a second telescopic assembly 12, a first reversing valve 23a and an oil tank jointly form a first loop. When the first direction valve 23a is in the first operating state, the first oil pump 22a takes oil from the tank and injects it into the first telescopic assembly 11, and extends the first telescopic assembly 11 and pushes the left bearing assembly 22 to the right, at which time the second telescopic assembly 12 is forced to perform a retracting movement since it is in communication with the tank. When the first directional valve 23a is in the second operating state, the first oil pump 22a takes oil from the tank and injects it into the second telescopic assembly 12 and extends the second telescopic assembly 12 and pushes the left bearing assembly 22 to move to the left, at which time the first telescopic assembly 11 is forced to perform a retracting movement as it communicates with the tank. When the first direction valve 23a is in the third working state, the first telescopic assembly 11 and the second telescopic assembly 12 are forced to keep the current pressure unchanged, so that the current working state is maintained.
And the second loop at least consists of the second oil pump 22b, the third telescopic assembly 13, the fourth telescopic assembly 14, the second reversing valve 23b and the oil tank. When the second direction valve 23b is in the first operating state, the second oil pump 22b takes oil from the tank and injects it into the third telescopic assembly 13, and extends the third telescopic assembly 13 and pushes the right bearing assembly 23 to the right, at which time the fourth telescopic assembly 14 is forced to perform a retracting movement as it is connected to the tank. When the second direction valve 23b is in the second operating state, the second oil pump 22b takes oil from the tank and injects it into the second telescopic assembly 12 and extends the second telescopic assembly 12 and pushes the right bearing assembly 23 to move to the left, at which time the third telescopic assembly 13 is forced to perform a retracting movement as it is connected to the tank. When the second direction valve 23b is in the third working state, the third telescopic assembly 13 and the fourth telescopic assembly 14 are forced to keep the current pressure unchanged, so as to maintain the current working state.
The oil in the oil tank can be selected from water, hydraulic oil and other oil which are difficult to compress, and is preferably hydraulic oil which is difficult to compress and has lubricating property.
In the present embodiment, the number of the first circuits, which are composed of at least the first oil pump 22a, the first telescopic assembly 11, the second telescopic assembly 12, the first direction valve 23a, and the oil tank together, is two. In a first circuit, the first and second retraction assemblies 11 and 12 respectively abut bearing outer race areas on either side of the left bearing assembly 22. In the other first circuit, the first telescopic assembly 11 and the second telescopic assembly 12 respectively abut against the bearing inner ring areas on both sides of the left bearing assembly 22. The two first circuits are able to move the left bearing assembly 22 simultaneously and adjust the support span of the rotating assembly 100 at a faster rate. Preferably, each first circuit includes a first flow meter 24a, a first pressure gauge 25a, and a first relief valve 26a provided between the first oil pump 22a and the first direction valve 23 a. This allows the operator to monitor the fluid flow and pressure by monitoring the readings of the first flow meter 24a and the first pressure gauge 25a to determine whether the bearing inner race area and the bearing inner race area of the left bearing assembly 22 are balanced. The first relief valve 26a can improve the safety performance of the first circuit.
The number of the second circuits at least formed by the second oil pump 22b, the third telescopic assembly 13, the fourth telescopic assembly 14, the second reversing valve 23b and the oil tank is two. In a second circuit, the third retraction assembly 13 and the fourth retraction assembly 14 abut against the outer bearing ring area on both sides of the right bearing assembly 23. In the other second circuit, the third telescopic assembly 13 and the fourth telescopic assembly 14 respectively abut against the bearing inner ring areas on both sides of the right bearing assembly 23. The two second circuits are capable of moving the right bearing assembly 23 simultaneously and adjusting the support span of the rotating assembly 100 at a faster speed. Preferably, each second circuit includes a second flow meter 24b, a second pressure gauge 25b, and a second relief valve 26b provided between the second oil pump 22b and the second direction changing valve 23 b. This enables the operator to monitor the fluid flow and pressure conditions by means of the indications of the second flow meter 24b and the second pressure gauge 25b, and thereby determine whether the forces in the inner race area and the outer race area of the right bearing assembly 23 are balanced. The second relief valve 26b can improve the safety performance of the second circuit.
In this embodiment, the bearing assembly 21 includes a cylinder 211 capable of accommodating the rotating shaft 24, a first end cap 212 connected to one end of the cylinder 211 and sleeved on the rotating shaft 24, and a first stop ring 213 fixedly disposed in the cylinder 211 and sleeved on the rotating shaft 24, the left bearing assembly 22 is disposed in the cylinder 211 and located between the first stop ring 213 and the first end cap 212, the first telescopic assembly 11 is disposed on the first end cap 212 and communicated with the first direction valve 23a through a first flow guiding channel 15 disposed on the first end cap 212 and the cylinder 211, and the second telescopic assembly 12 is disposed on the first stop ring 213 and communicated with the first direction valve 23a through a second flow guiding channel 16 disposed on the first stop ring 213 and the cylinder 211.
In this embodiment, the bearing assembly 21 includes a second end cap 214 connected to the other end of the cylinder 211 and sleeved on the rotation shaft 24, the second end cap 214 includes an annular body 214a connected to the cylinder 211, a second stop ring 214b disposed on one side of the annular body 214a, and a third stop ring 214c disposed on the other side of the annular body 214a, the right bearing assembly 23 is disposed in the cylinder 211 and located between the second stop ring 214b and the third stop ring 214c, the third telescopic assembly 13 is disposed on the second stop ring 214b and communicated with the second direction valve 23b through a third flow guide channel 17 disposed on the second stop ring 214b and the annular body 214a, and the fourth telescopic assembly 14 is disposed on the third stop ring 214c and communicated with the second direction valve 23b through a fourth flow guide channel 18 disposed on the third stop ring 214c and the annular body 214 a.
In this embodiment, the rotating assembly 200 further includes a motor stator 26 disposed on the inner wall of the cylinder 211 and a motor rotor 25 fixedly disposed on the rotating shaft 24. That is, the rotating assembly 200 integrates the motor structure directly therein, thereby having the advantages of compact structure, light weight, small inertia, small vibration, low noise, fast response, etc.
In the embodiment shown in fig. 4, each hydraulically-controlled telescopic assembly includes an annular cavity 131 provided on the carrier assembly 21, an annular piston 132 provided in the annular cavity 131, and a push ring 133 fixedly provided on the annular piston 132 and abutting against the side of the left or right bearing assembly 22 or 23. Each annular piston 132 is able to slide along the walls of the annular chamber 131 when oil is injected into the annular chamber 131, extending out and pushing against the left or right bearing assembly 22, 23.
Preferably, the left bearing assembly 22 and the right bearing assembly 23 each include two or three juxtaposed adjacent ball bearings. In each bearing assembly, the number of bearings can be selected according to actual machining conditions, and the larger the number of bearings, the larger the rigidity, and the smaller the number of bearings, the smaller the resistance formed by the bearings. Preferably, the annular piston 132 abutting against the inner ring of the bearing assembly and the pushing rings 133 at both sides connected to the annular cavity 131 are rotary sealing rings, so that when the rotating shaft 24 rotates, the first telescopic assembly 11 and the second telescopic assembly 12 abutting against the inner ring of the left bearing assembly 22 can rotate together with the inner ring of the left bearing assembly 22. The pushing rings 133 at two sides of the annular piston 132 abutting against the outer ring of the bearing assembly and connected with the annular cavity 131 are O-shaped sealing rings, so that when the motor rotor 25 arranged on the rotating shaft 24 is driven by the motor stator 26 arranged on the inner wall of the cylinder body 211, the cylinder body 211 can be kept still, and the motor stator 25 can drive the rotating shaft 24 to rotate relative to the bearing assembly 21.
In one embodiment, not shown, there is provided a machine tool comprising a rotating assembly 200 and a support span adjustment device for use on the rotating assembly 200, wherein the rotating shaft 24 of the rotating assembly 200 is a spindle.
In summary, the supporting span adjusting apparatus 100 and the machine tool for the rotating assembly according to the embodiments of the present invention can solve the problem that the supporting span of the rotating assembly is difficult to be adjusted, so as to prolong the service life of the rotating assembly 200 and avoid the influence on the machine tool processing quality and the production efficiency due to the inappropriate supporting span.
In the description of the present application, it is to be understood that the terms "left", "right", "inside", "outside", "axial", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or variations within the technical scope of the present invention disclosed, and such changes or variations should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A support span adjustment apparatus for a rotating assembly including a carrier assembly, left and right bearing assemblies provided in the carrier assembly and spaced apart in a left-right direction, and a rotating shaft incorporated in the left and right bearing assemblies in the left-right direction, the support span adjustment apparatus comprising:
the execution unit is arranged on the bearing assembly and comprises a first telescopic assembly, a second telescopic assembly, a third telescopic assembly and a fourth telescopic assembly, wherein the first telescopic assembly can be used for pushing the left bearing assembly to slide rightwards relative to the rotating shaft and the bearing assembly when extending out, the second telescopic assembly can be used for pushing the left bearing assembly to slide leftwards relative to the rotating shaft and the bearing assembly when extending out, the third telescopic assembly can be used for pushing the right bearing assembly to slide rightwards relative to the rotating shaft and the bearing assembly when extending out, and the fourth telescopic assembly can be used for pushing the right bearing assembly to slide leftwards relative to the rotating shaft and the bearing assembly when extending out;
and the control unit is connected with the first telescopic assembly, the second telescopic assembly, the third telescopic assembly and the fourth telescopic assembly and can at least control the extension movement of the first telescopic assembly, the second telescopic assembly, the third telescopic assembly and the fourth telescopic assembly.
2. The support span adjustment apparatus of claim 1, wherein the first, second, third and fourth telescoping assemblies are hydraulically-controlled telescoping assemblies, the control unit comprises an oil tank, a first oil pump connected with the oil tank, a second oil pump connected with the oil tank, a first reversing valve and a second reversing valve, wherein the first reversing valve and the second reversing valve are O-shaped three-position four-way reversing valves, an oil inlet of the first reversing valve is communicated with an oil tank, the oil supply port is communicated with a first oil pump, two working ports of the oil pump are respectively communicated with a first telescopic component and a second telescopic component, the oil inlet of the second reversing valve is communicated with an oil tank, the oil supply port is communicated with the second oil pump, and the two working ports are respectively communicated with the third telescopic assembly and the fourth telescopic assembly.
3. The support span adjustment device according to claim 2, characterized in that:
the number of first loops at least formed by the first oil pump, the first telescopic assembly, the second telescopic assembly, the first reversing valve and the oil tank is two, in one first loop, the first telescopic assembly and the second telescopic assembly are respectively abutted against outer ring areas of bearings on two sides of the left bearing assembly, and in the other first loop, the first telescopic assembly and the second telescopic assembly are respectively abutted against inner ring areas of bearings on two sides of the left bearing assembly;
the number of second return circuits that constitute jointly by second oil pump, third flexible subassembly, fourth flexible subassembly and second switching-over valve and oil tank is two at least in one in the second return circuit, third flexible subassembly and fourth flexible subassembly respectively with the bearing inner race district of the both sides of right bearing assembly is held against, in another in the second return circuit, third flexible subassembly and fourth flexible subassembly respectively with the bearing inner race district of the both sides of right bearing assembly holds against.
4. The support span adjustment arrangement of claim 3, wherein the first circuit includes a first flow meter, a first pressure gauge, and a first relief valve disposed between the first oil pump and a first reversing valve, and the second circuit includes a second flow meter, a second pressure gauge, and a second relief valve disposed between the second oil pump and a second reversing valve.
5. The support span adjusting device according to claim 2, wherein the bearing assembly includes a barrel capable of accommodating the rotating shaft, a first end cap connected to one end of the barrel and sleeved on the rotating shaft, and a first stop ring fixedly disposed in the barrel and sleeved on the rotating shaft, the left bearing assembly is disposed in the barrel and located between the first stop ring and the first end cap, the first telescopic assembly is disposed on the first end cap and communicated with the first direction valve through a first flow guide channel disposed on the first end cap and the barrel, and the second telescopic assembly is disposed on the first stop ring and communicated with the first direction valve through a second flow guide channel disposed on the first stop ring and the barrel.
6. The support span adjusting apparatus according to claim 5, wherein the bearing assembly includes a second end cap coupled to the other end of the cylinder and fitted over the rotation shaft, the second end cover comprises an annular body connected with the cylinder, a second stop ring arranged on one side of the annular body and a third stop ring arranged on the other side of the annular body, the right bearing assembly is arranged in the cylinder and positioned between the second stop ring and the third stop ring, the third telescopic assembly is arranged on the second stop ring and is communicated with the second reversing valve through a third flow guide channel which is arranged on the second stop ring and the annular body, and the fourth telescopic assembly is arranged on the third stop ring and communicated with the second reversing valve through fourth flow guide channels arranged on the third stop ring and the annular body.
7. The support span adjusting apparatus according to claim 5, further comprising a motor stator provided on an inner wall of the cylinder and a motor rotor fixedly provided on the rotating shaft.
8. The support span adjustment arrangement of any one of claims 2 to 6, wherein each hydraulically controlled telescopic assembly comprises an annular chamber provided on the carrier assembly, an annular piston provided within the annular chamber, and a push ring fixedly provided on the annular piston and abutting against a side of the left or right bearing assembly.
9. The support span adjustment arrangement of any one of claims 1 to 6, wherein the left bearing assembly comprises two or three juxtaposed adjacent ball bearings and the right bearing assembly comprises two or three juxtaposed adjacent ball bearings.
10. A machine tool comprising a rotating assembly and a support span adjustment apparatus according to any one of claims 1 to 9 for use on the rotating assembly, wherein the axis of rotation of the rotating assembly is a spindle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457218.1A CN112846828B (en) | 2020-12-10 | 2020-12-10 | Support span adjusting device for rotating assembly and machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457218.1A CN112846828B (en) | 2020-12-10 | 2020-12-10 | Support span adjusting device for rotating assembly and machine tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112846828A CN112846828A (en) | 2021-05-28 |
| CN112846828B true CN112846828B (en) | 2022-03-18 |
Family
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10163089C1 (en) * | 2001-12-20 | 2003-07-03 | Paul Mueller Gmbh & Co Kg | Machine tool motor spindle for holding a tool used in machining a workpiece provides improved machining accuracy by use of a tool displacement sensor integral in the spindle |
| CN102554280A (en) * | 2011-12-16 | 2012-07-11 | 上海大学 | High speed electric spindle with preload control device |
| KR101366140B1 (en) * | 2013-06-10 | 2014-02-25 | 주식회사 에코텍 | Bearing variable preload(adjustable preload) system utilizing deforming of sealing member and small gap of stroke |
| EP3020507A4 (en) * | 2013-07-12 | 2017-04-19 | Echo Tech Co., Ltd. | Bearing variable preload system utilizing gap between strokes for preload adjustment and elastic deformation of sealing member |
| CN105402177B (en) * | 2015-12-25 | 2018-01-16 | 徐州重型机械有限公司 | A kind of executing agency's adjusting means and engineering machinery |
| CN110193611B (en) * | 2019-05-24 | 2024-04-16 | 南阳师范学院 | Electric spindle structure of hybrid supporting self-balancing machine tool and control method thereof |
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