A high-precision turntable with hydraulic brake structure

Abstract

The present invention discloses a high-precision turntable with a hydraulic brake structure, including a turntable body, a mounting seat, an expansion sleeve, a clamping sleeve and a rotary drive mechanism. A first mounting cavity is provided on the top of the mounting seat, a mounting column is provided in the center of the first mounting cavity, and the expansion sleeve, the clamping sleeve and the rotary drive mechanism are arranged in sequence from the inside to the outside of the first mounting cavity; the expansion sleeve surrounds the outside of the mounting column and forms an annular sealing oil cavity with the outer wall of the mounting column, and an oil path connected to the sealing oil cavity is formed on the mounting seat; the elastic modulus of the clamping sleeve is greater than the elastic modulus of the expansion sleeve, the clamping sleeve is arranged outside the expansion sleeve, and when the sealing oil cavity is not oiled, the clamping sleeve and the rotary drive mechanism are clearance-matched; the turntable body is arranged above the mounting column and covers the first mounting cavity, and the rotary drive mechanism is connected to the turntable body to drive the turntable body to rotate. The present invention has low braking energy loss, is easy to process, and has precise positioning.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control servo turntables, and in particular to a high-precision turntable with a hydraulic brake structure. Background Art

[0002] At present, there are various forms of CNC servo turntables at home and abroad, among which worm gear turntables are widely used because of their large torque transmission and simple structure.

[0003] Traditional worm gear turntables use steel sleeves or discs to achieve brake positioning. The torque of the disc brake structure is achieved by sacrificing radial space. Under the same radial space conditions, the torque generated by the disc brake is smaller than that of the steel sleeve brake. Therefore, when the disc brake structure method is applied to a small turntable, its braking torque is small and the braking accuracy is not high.

[0004] The steel sleeve brake method has a simple structure and high brake positioning accuracy, but the steel sleeve brake has a large energy loss, the steel sleeve wall thickness needs to be made very thin, and it is difficult to process and debug. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high-precision turntable with a hydraulic brake structure, which has small braking energy loss, is easy to process, and has precise positioning.

[0006] In order to solve the above technical problems, the present invention provides a high-precision turntable with a hydraulic brake structure, including a turntable body, a mounting seat, an expansion sleeve, a clamping sleeve and a rotation drive mechanism.

[0007] A first mounting cavity is formed on the top of the mounting seat, a mounting column is provided at the center of the first mounting cavity, and the expansion sleeve, the clamping sleeve and the rotation drive mechanism are sequentially arranged in the first mounting cavity from the inside to the outside;

[0008] The expansion sleeve embraces the outside of the mounting column and forms an annular sealing oil cavity with the outer wall of the mounting column, and an oil path communicating with the sealing oil cavity is formed on the mounting seat;

[0009] The elastic modulus of the clamping sleeve is greater than that of the expansion sleeve, the clamping sleeve is arranged outside the expansion sleeve, and when the sealing oil chamber is not filled with oil, the clamping sleeve and the rotary drive mechanism are clearance-matched;

[0010] The turntable body is disposed above the mounting post and covers the first mounting cavity. The rotation drive mechanism is connected to the turntable body and is used to drive the turntable body to rotate.

[0011] As an improvement of the above solution, the clamping sleeve includes an integrally formed fixing portion and a clamping portion, the fixing portion is fixed to the end of the mounting column, and the clamping portion is arranged between the expansion sleeve and the rotation drive mechanism.

[0012] As an improvement of the above solution, the circumferential array of the clamping portion is provided with elongated grooves or through holes.

[0013] As an improvement of the above solution, a spiral groove is formed on the outer wall of the clamping portion along the circumferential direction.

[0014] As an improvement of the above solution, a positioning ring is sleeved on the outer side of the mounting column, and one end of the holding portion away from the fixing portion abuts against the positioning ring;

[0015] Two ends of the expansion sleeve are respectively in contact with the fixing portion and the positioning ring.

[0016] As an improvement of the above solution, the rotary drive mechanism includes a worm gear transmission assembly and a transmission sleeve, the worm gear transmission assembly includes a worm and a worm wheel meshing with each other, the worm is connected to the power mechanism, the bottom of the transmission sleeve is coaxially fixed with the worm wheel, and the top is fixed with the turntable body;

[0017] When the sealing oil chamber is filled with hydraulic oil, the clamping sleeve abuts against the inner wall of the transmission sleeve.

[0018] As an improvement of the above solution, a second mounting cavity is provided in the mounting column, a grating is provided in the second mounting cavity, and the turntable body is provided with a connecting shaft extending into the second mounting cavity, and the connecting shaft is connected to the grating.

[0019] As an improvement of the above solution, one end of the worm is connected to the power mechanism, and the other end is provided with an adjusting nut, which is used to compensate for the axial clearance between the worm wheel and the worm.

[0020] As an improvement of the above-mentioned scheme, the oil circuit on the mounting seat includes a first oil circuit and a second oil circuit, the first oil circuit and the second oil circuit are arranged on different sides of the mounting seat, the first oil circuit is connected to the upper part of the sealed oil chamber, and the second oil circuit is connected to the lower part of the sealed oil chamber.

[0021] As an improvement of the above solution, the expansion sleeve is made of plastic or rubber, and the clamping sleeve is made of metal or alloy.

[0022] The implementation of the present invention has the following beneficial effects:

[0023] The present invention provides a high-precision turntable with a hydraulic brake structure, wherein an expansion sleeve and a clamping sleeve with different elastic moduli are sequentially sleeved outside a mounting column, wherein the expansion sleeve and the outer wall of the mounting column form an annular sealing oil chamber, and when the sealing oil chamber is not flowing with oil, the clamping sleeve and the rotary drive mechanism are clearance-matched, and the rotary drive mechanism can drive the turntable body to rotate under the power mechanism; when the power mechanism stops driving and the sealing oil chamber flows with oil, the hydraulic oil in the sealing oil chamber squeezes the expansion sleeve, causing the expansion sleeve with a smaller elastic modulus to undergo a larger deformation, and at the same time uniformly squeezes the clamping sleeve, causing the clamping sleeve to expand outward, and finally stopping the rotary drive mechanism to achieve braking;

[0024] Compared with the strict requirements on thickness control of the steel sleeve brake structure during steel sleeve processing, the processing of the expansion sleeve and the clamping sleeve of this embodiment is simpler, and the braking energy loss is small;

[0025] Compared with traditional disc brakes, the brake structure that holds the sleeve wall and the rotating drive mechanism has greater braking torque and higher positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of a high-precision turntable with a hydraulic brake structure of the present invention;

[0027] Figure 2 yes Figure 1 A top view of

[0028] Figure 3 yes Figure 2 AA section structure schematic diagram of the middle mounting seat;

[0029] Figure 4 yes Figure 2 AA cross-sectional structure schematic diagram;

[0030] Figure 5 yes Figure 1 The main view;

[0031] Figure 6 yes Figure 5 Schematic diagram of BB cross-section structure;

[0032] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure of the D portion;

[0033] Figure 8 yes Figure 7 Schematic diagram of the holding sleeve structure;

[0034] Fig. 9 yes Figure 7 Schematic diagram of the expansion sleeve structure;

[0035] Fig.10 yes Figure 5Schematic diagram of the CC cross-section structure. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] like Figures 1 to 4 As shown, the present invention provides an embodiment of a high-precision turntable with a hydraulic brake structure, comprising a turntable body 1, a mounting seat 2, an expansion sleeve 3, a clamping sleeve 4 and a rotation drive mechanism 5, wherein a first mounting cavity 21 is provided on the top of the mounting seat 2, and a mounting column 22 is provided in the center of the first mounting cavity 21, and the expansion sleeve 3, the clamping sleeve 4 and the rotation drive mechanism 5 are sequentially arranged in the first mounting cavity 21 from the inside to the outside; Figures 5 to 7 The expansion sleeve 3 is surrounded by the outside of the mounting column 22 and forms an annular sealing oil chamber a with the outer wall of the mounting column 22. An oil path connected to the sealing oil chamber a is formed on the mounting seat 2; the elastic modulus of the clamping sleeve 4 is greater than the elastic modulus of the expansion sleeve 3. The clamping sleeve 4 is sleeved outside the expansion sleeve 3, and when the sealing oil chamber a is not oiled, the clamping sleeve 4 is clearance-matched with the rotation drive mechanism 5; the turntable body 1 is arranged above the mounting column 22 and covers the first mounting cavity 21. The rotation drive mechanism 5 is connected to the turntable body 1 for driving the turntable body 1 to rotate.

[0038] In this embodiment, an expansion sleeve 3 and a clamping sleeve 4 with different elastic moduli are sequentially sleeved outside the mounting column 22, wherein the expansion sleeve 3 and the outer wall of the mounting column 22 form an annular sealing oil chamber a. When the sealing oil chamber a is not flowing with oil, the clamping sleeve 4 and the rotary drive mechanism 5 are clearance-matched, and the rotary drive mechanism 5 can drive the turntable body 1 to rotate under the power mechanism; when the power mechanism stops driving and the sealing oil chamber a is flowing with oil, the hydraulic oil in the sealing oil chamber a squeezes the expansion sleeve 3, causing the expansion sleeve 3 with a smaller elastic modulus to undergo a larger deformation, and at the same time, evenly squeezes the clamping sleeve 4, causing the clamping sleeve 4 to expand outward, and finally stops the rotary drive mechanism 5 from rotating, thereby achieving braking.

[0039] Compared with the strict requirement on thickness control during steel sleeve processing in the steel sleeve brake structure, the expansion sleeve 3 and the clamping sleeve 4 of this embodiment are simpler to process and have low braking energy loss.

[0040] Compared with the traditional disc brake, the brake structure of the clamping sleeve 4 wall and the rotary drive mechanism 5 has a larger braking torque and a higher positioning accuracy.

[0041] The expansion sleeve 3 used to form the sealing oil chamber a in this embodiment has a small elastic modulus and is preferably made of plastic or rubber. Its elastic modulus is about 1 / 100 of that of steel and is easy to deform. Compared with the traditional steel sleeve for forming the sealing oil chamber a, the energy consumed by deformation is small.

[0042] Combination Figure 8 The clamping sleeve 4 preferably includes an integrally formed fixing portion 41 and a clamping portion 42. The clamping portion 42 is arranged between the expansion sleeve 3 and the rotation drive mechanism 5. The fixing portion 41 is arranged at one end of the clamping portion 42 and is fixed to the end of the mounting column 22. On the one hand, it can prevent the clamping sleeve 4 from moving in a series during braking and affecting the braking effect. On the other hand, only one end of the clamping sleeve 4 is fixed to the mounting column 22, and the clamping portion 42 away from the fixing portion 41 is gradually constrained. It is easier to expand outward when subjected to radial compression by the expansion sleeve 3, helping the clamping portion 42 to gradually expand outward from bottom to top, making it easier for the clamping sleeve 4 to deform and consuming less energy for deformation.

[0043] In order to enable the hydraulic oil to fill the sealed oil chamber a more quickly and evenly during braking, the oil circuit on the mounting seat 2 includes a first oil circuit 23 and a second oil circuit 24. The first oil circuit 23 and the second oil circuit 24 are arranged on different sides of the mounting seat 2. The first oil circuit 23 is connected to the upper part of the sealed oil chamber a, and the second oil circuit 24 is connected to the lower part of the sealed oil chamber a.

[0044] The clamping sleeve 4 of this embodiment is preferably made of copper or copper alloy which has good wear resistance and relatively soft texture.

[0045] In order to make the clamping sleeve 4 easier to expand outward under the pressure of the expansion sleeve 3, in this embodiment, a long strip of grooves or through holes 421 are preferably provided in a circumferential array of the clamping portion 42, and a spiral groove 422 is opened on the outer wall of the clamping portion 42 along the circumferential direction.

[0046] Combination Fig. 9 The peripheries of both ends of the expansion sleeve 3 form convex rings 31 protruding toward the inner wall, and the convex ring 31 is sealed and connected to the outer wall of the mounting column 22 via a sealing ring 6.

[0047] The outer side of the mounting column 22 is provided with a positioning ring 7, and the end of the clamping portion 42 away from the fixing portion 41 abuts against the positioning ring 7; the two ends of the expansion sleeve 3 abut against the fixing portion 41 and the positioning ring 7 respectively, thereby achieving axial positioning of the clamping sleeve 4 and the expansion sleeve 3.

[0048] The rotary drive mechanism 5 includes a worm wheel 52, a worm 51 transmission assembly and a transmission sleeve. The worm wheel 52, a worm 51 transmission assembly includes a worm 51 and a worm wheel 52 that mesh with each other. The worm 51 is connected to the power mechanism. The bottom of the transmission sleeve is coaxially fixed with the worm wheel 52, and the top is fixed to the turntable body 1. The first mounting cavity 21 is provided with a first bearing 211 that abuts against the mounting seat 2 and the transmission sleeve; when the sealing oil chamber a is filled with hydraulic oil, the clamping sleeve 4 abuts against the inner wall of the transmission sleeve.

[0049] The mounting seat 2 specifically includes a base 25, a bearing seat 26 and a sleeve 27. A boss 251 is provided in the center of the base 25. The sleeve 27 is fixed to the top of the boss 251 to form the mounting column 22. The bearing seat 26 is fixed to the base 25. The outer ring of the first bearing 211 abuts against the bearing seat 26. A support platform 261 for supporting the outer ring of the first bearing 211 is provided at the lower part of the bearing seat 26. The first oil circuit 23 and the second oil circuit 24 are both formed on the base 25 and the sleeve 27.

[0050] One end of the worm 51 is connected to the power mechanism, and the other end is provided with an adjusting nut 511, which is used to compensate for the axial clearance between the worm wheel 52 and the worm 51. After long-term operation, the axial clearance between the worm wheel 52 and the worm 51 caused by wear can be compensated by rotating the adjusting nut 511, so that the worm wheel 52 and the worm 51 are closely meshed, helping to improve the transmission accuracy of the power mechanism to the worm wheel 52.

[0051] Combination Fig.10 The power mechanism includes a driving motor 8 and a driving tooth 81 arranged at the power output end of the driving motor 8, and the worm 51 is provided with a transmission tooth 512 meshing with the driving tooth 81.

[0052] For the convenience of processing, the transmission sleeve of this embodiment specifically includes a mounting plate 53 and a mounting flange 54. The top of the mounting plate 53 is fixed to the mounting flange 54, and the bottom is coaxially fixed to the worm gear 52. The turntable body 1 is fixed to the top of the mounting flange 54 by screws 11, and a sealing plug 12 is provided above the screw 11 to prevent external water vapor from entering the first mounting cavity 21 through the screw hole of the turntable body 1. The inner walls of the mounting plate 53 and the mounting flange 54 are flush, and when the sealing oil chamber a is filled with hydraulic oil, the clamping sleeve 4 abuts against the inner walls of the mounting plate 53 and the mounting flange 54 at the same time.

[0053] In order to further improve the brake positioning accuracy of the turntable body 1, in this embodiment, a second mounting cavity 221 is preferably provided in the mounting column 22, a circular grating 9 is provided in the second mounting cavity 221, the turntable body 1 is provided with a connecting shaft 13 extending into the second mounting cavity 221, and a second bearing 131 is provided in the second mounting cavity 221 to abut against the mounting seat 2 and the connecting shaft 13. The connecting shaft 13 is connected to the circular grating 9.

[0054] In this embodiment, the turntable body 1 is directly connected to the circular grating 9 via the connecting shaft 13. The circular grating 9 can sense the rotation position of the turntable body 1 in real time, thereby avoiding the positioning error caused by the transmission error of the transmission components and achieving more accurate positioning.

[0055] The outer wall of the transmission sleeve is provided with an origin sensing block 531, and the mounting seat 2 is provided with a proximity switch 28 corresponding to the origin sensing block 531. The proximity switch 28 senses the origin sensing block 531 to determine the starting position of the transmission sleeve.

[0056] When the system detects that the angle of motor rotation is inconsistent with the angle between the brake stop position and the starting position of the turntable body 1 actually fed back by the circular grating 9, the power mechanism starts again to fine-tune the turntable body 1 again, so that the brake stop position of the turntable body 1 is consistent with the preset position, and the positioning is very accurate.

[0057] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A high-precision turntable with a hydraulic brake structure, characterized in that: It includes a turntable body, a mounting seat, an expansion sleeve, a clamping sleeve and a rotary drive mechanism. A first mounting cavity is formed on the top of the mounting seat, a mounting column is provided at the center of the first mounting cavity, and the expansion sleeve, the clamping sleeve and the rotation drive mechanism are sequentially arranged in the first mounting cavity from the inside to the outside; The expansion sleeve embraces the outside of the mounting column and forms an annular sealing oil cavity with the outer wall of the mounting column, and an oil path communicating with the sealing oil cavity is formed on the mounting seat; The elastic modulus of the clamping sleeve is greater than that of the expansion sleeve, the clamping sleeve is arranged outside the expansion sleeve, and when the sealing oil chamber is not filled with oil, the clamping sleeve and the rotary drive mechanism are clearance-matched; The turntable body is disposed above the mounting column and covers the first mounting cavity, and the rotation drive mechanism is connected to the turntable body and is used to drive the turntable body to rotate; The clamping sleeve comprises an integrally formed fixing portion and a clamping portion, wherein the fixing portion is arranged at one end of the clamping portion and is fixed to the end of the mounting column, and the clamping portion is arranged between the expansion sleeve and the rotation drive mechanism; The circumferential array of the clamping portion is provided with long strip-shaped grooves or through holes, and / or the outer wall of the clamping portion is provided with spiral grooves along the circumferential direction; A positioning ring is sleeved on the outer side of the mounting column, and one end of the clamping portion away from the fixing portion abuts against the positioning ring; Two ends of the expansion sleeve are respectively in contact with the fixing portion and the positioning ring.

2. The high-precision turntable with a hydraulic brake structure as claimed in claim 1, characterized in that: The rotary drive mechanism comprises a worm gear transmission assembly and a transmission sleeve, wherein the worm gear transmission assembly comprises a worm and a worm wheel meshing with each other, the worm is connected to the power mechanism, the bottom of the transmission sleeve is coaxially fixed with the worm wheel, and the top is fixed with the turntable body; When the sealing oil chamber is filled with hydraulic oil, the clamping sleeve abuts against the inner wall of the transmission sleeve.

3. The high-precision turntable with a hydraulic brake structure as claimed in claim 2, characterized in that: A second mounting cavity is arranged in the mounting column, a grating is arranged in the second mounting cavity, and a connecting shaft extending into the second mounting cavity is arranged in the turntable body, and the connecting shaft is connected to the grating.

4. The high-precision turntable with a hydraulic brake structure as claimed in claim 2, characterized in that: One end of the worm is connected to the power mechanism, and the other end is provided with an adjusting nut, and the adjusting nut is used to compensate for the axial clearance between the worm wheel and the worm.

5. The high-precision turntable with a hydraulic brake structure as claimed in claim 1, characterized in that: The oil circuit on the mounting seat includes a first oil circuit and a second oil circuit, the first oil circuit and the second oil circuit are arranged on different sides of the mounting seat, the first oil circuit is connected to the upper part of the sealing oil chamber, and the second oil circuit is connected to the lower part of the sealing oil chamber.

6. The high-precision turntable with a hydraulic brake structure as claimed in claim 1, characterized in that: The expansion sleeve is made of plastic or rubber, and the clamping sleeve is made of metal or alloy.

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