CN203304990U - Dividing plate - Google Patents

Abstract

The utility model provides a dividing plate to solve the problems of too many bearing parts and unstable brake of the existing dividing plate. The dividing plate comprises a base, a main shaft rotatably arranged on the base, a bearing mechanism installed between the base and the main shaft, a transmission mechanism for driving the main shaft, and a brake mechanism comprising a plurality of brake pads, at least one of the plurality of brake pads is connected to the main shaft, and when the at least one brake pad produces a braking effect, the main shaft can be prevented from moving.

Description

Dial

technical field

The utility model relates to an indexing plate, in particular to a rotary indexing plate for machine tools. the

Background technique

A machine tool (such as a numerically controlled milling machine or a machining center) is usually provided with a rotary table for fixing workpieces to be processed, and the two ends of the rotary table are respectively installed on the turntables of two rotary indexing plates. The turntable can be rotated to adjust the angle of the workpiece on the table relative to the cutting tool, so as to process various structures on the workpiece. When the turntable rotates to a predetermined angle, the turntable must stop rotating for the tool to process the workpiece. In addition, during processing, the turntable must be fixed by the brake device in the rotary indexing table, so as to avoid slight rotation of the turntable due to cutting force, which will result in poor machining accuracy of the workpiece. the

As shown in Figure 1, the rotary indexing plate 1 includes a base 11, a rotating shaft 12 that can rotate relative to the base 11, a rotating disc 13 fixed at one end of the rotating shaft 12, and is arranged between the base 11 and the rotating shaft 12 for supporting the rotating shaft 12 relative to each other. A bearing device 14 rotating on the base 11 , a brake pressure ring 15 fixed on the other end of the rotating shaft 12 and rotating with the rotating shaft 12 , and a brake device 16 disposed between the base 11 and the brake pressure ring 15 . the

The brake device 16 includes a brake bottom plate 161 fixed on the base 11, a hollow channel 162 formed in the brake bottom plate 161, a brake piston 163 accommodated in the brake bottom plate 161, and a brake lining 164 fixed on the brake pressure ring 15. . With the above structure, when the fluid supplied by the air pressure source or the oil pressure source enters the brake base plate 161 through the flow channel 162, the brake piston 163 can push the brake lining 164, so that the brake lining 164 is pressed against the base 11, and then the rotating shaft 12 and rotating disk 13 can not rotate. the

The bearing device 14 comprises a bearing block 141 fixed on the base 11, a conventional bearing cap 142 fixed on the rotating shaft 12, a conventional bearing plate 143 located between the bearing seat 141 and the conventional bearing cap 142, and a conventional bearing Three bearing pins 144 on three different surfaces of sheet 143 . the

However, the above-mentioned known brake device 16 only has a single brake lining 164, so the braking friction force only occurs on the opposite sides of the brake lining 164, the braking area is small, and the braking effect is poor. The power of 13 is small, causes rotating shaft 12 and rotating disk 13 to rotate slightly because of cutting force during processing, reduces the precision of processing. Furthermore, in order to avoid external cutting force from causing the brake lining 164 to break, so the thickness of a single brake lining 164 must be thicker to have sufficient strength, but the rigidity of the thicker brake lining 164 is too high to absorb the friction during processing. The vibration caused by the dynamic cutting force to the turntable 13 and the rotating shaft 12 further adversely affects the machining accuracy. the

In addition, because the power of oil pressure is greater than that of air pressure, the contact area of the pressure source of the brake piston 163 of the rotary index plate 1 connected to the oil pressure source is small. Relatively, the rotary index plate 1 connected to the air pressure source The contact area of the brake piston 163 pressure source is larger, so that the braking force of the rotary indexing plate 1 of two different pressure sources can be as large. This fact leads to the fact that the size of the parts of the rotary indexing plate 1 must be designed differently according to the different pressure sources connected. Therefore, in order to meet the needs of different users, the manufacturer must prepare a variety of parts, which increases the cost of assembly and future maintenance. . the

On the other hand, the conventional bearing device 14 includes a large number of parts, and there are many mating surfaces during assembly, which tends to cause excessive cumulative tolerances, thereby affecting the division accuracy of the rotary index plate 1 and the precision of the surface of the turntable 13 . Furthermore, since a plurality of parts are to be assembled in the limited space between the base 11 and the rotating shaft 13, the size of each part must be miniaturized, resulting in a low load bearing capacity of the bearing device 14. the

Utility model content

Therefore, an object of the present invention is to provide an indexing plate with good braking effect. the

Yet another object of the present invention is to provide an indexing plate with less vibration during processing. the

Another object of the present utility model is to provide an indexing plate, which can process workpieces with high precision. the

Another object of the present utility model is to provide an indexing plate, which can be connected to any one of the oil pressure source and the air pressure source, so as to reduce the diversity of parts and facilitate assembly and maintenance. the

Another purpose of the present utility model is to provide an indexing plate with high division precision and high precision of the working disc surface. the

Another object of the present utility model is to provide an indexing plate with high load capacity. the

Therefore, the indexing plate of the present invention comprises: a base; a main shaft rotatably arranged on the base; a bearing mechanism installed between the base and the main shaft; a transmission mechanism for driving the main shaft; and a brake The mechanism includes a plurality of brake pads, at least one brake pad of the multiple brake pads is connected to the main shaft, and when the at least one brake pad produces a braking effect, the main shaft can be prevented from moving. the

Preferably, the brake mechanism includes a first inner brake pad connected to the main shaft and an outer brake pad fixed to the base, the first inner brake pad and the outer brake pad are at least partially overlapped. the

Preferably, the braking mechanism further includes a second inner brake pad connected to the main shaft, and the outer brake pad is located between the first inner brake pad and the second inner brake pad. the

Preferably, the brake mechanism further includes a brake bottom cover fixed on the base and a piston slidably accommodated in the brake bottom cover, and the piston can press against the first inner brake pad to make the first inner brake The pad, the outer brake pad, and the second inner brake pad are in contact with each other, and the second inner brake pad is in contact with the base, so as to exert an excellent braking effect and ensure machining accuracy. the

Preferably, the size of the piston is sufficient to push the piston against the first inner brake pad, the outer brake pad, and the second inner brake pad when the indexing disc is externally connected to an air pressure source. The base, and the strength of each component included in the brake mechanism and the fixing strength of each component to the adjacent parts are sufficient to withstand the pressure when the indexing plate is externally connected to an oil pressure source. Therefore, the indexing plate can be suitable for both oil pressure source and air pressure source with one size design. the

Preferably, the brake mechanism further includes a brake member fixed to the main shaft, and the first inner brake pad and the second inner brake pad are fixed to the brake member. the

Preferably, the first inner brake pad, the second inner brake pad, and the outer brake pad are ring-shaped, and the first inner brake pad and the second inner brake pad are fixed to the brake member at a portion close to their inner diameter, The outer brake pad is fixed on the base with a portion close to its outer diameter, and the outer diameters of the first inner brake pad and the second inner brake pad are larger than the inner diameter of the outer brake pad. the

Preferably, the brake mechanism further includes a spacer between the first inner brake pad and the second inner brake pad, and a channel formed in the brake member, one end of the channel is connected to the piston, and the channel is connected to the piston. The other end can be externally connected to an air pressure source or an oil pressure source. the

Preferably, the first inner brake pad, the outer brake pad, and the second inner brake pad have flexibility to absorb vibration during processing and further improve processing accuracy. the

Preferably, the indexing plate further includes a reset mechanism, one end of the reset mechanism contacts the base, and the other end of the reset mechanism contacts the piston, so as to release the braking state. the

Preferably, the reset mechanism includes a cylindrical member and an elastic member accommodated in the cylindrical member. the

Preferably, the bearing mechanism includes at least one rolling member for directly contacting the main shaft, so that the conventional bearing seat can be omitted to improve the assembly accuracy of the indexing plate. the

Preferably, the bearing mechanism includes a bearing cover fixed to the main shaft, a bearing piece fixed to the base, a first rolling member located between the bearing cover and the bearing piece, a second rolling member located between the bearing piece and the main shaft and a third rolling member located between the bearing piece and the main shaft and having a longitudinal direction different from that of the second rolling member, thereby forming a bearing member with three-sided restraint. the

Preferably, the longitudinal direction of the third rolling member is perpendicular to the longitudinal direction of the second rolling member and parallel to the longitudinal direction of the first rolling member. the

Preferably, the transmission mechanism includes a worm wheel fixed to the main shaft and a worm engaged with the worm wheel. the

As mentioned above, the advantages of this utility model compared with the prior art include: good braking effect, high precision of the processed workpiece, connection to either oil pressure source or air pressure source to reduce the diversity of parts, load capacity higher. the

Those skilled in the art can better understand other benefits and other purposes of the utility model defined in the claims after reading the specification. the

Description of drawings

The above is a detailed description of the indexing plate of the present invention with reference to the preferred embodiment and the accompanying drawings. The drawings are not necessarily drawn in true scale, so the present invention is not limited to the proportions in the drawings. In the attached picture:

Figure 1 is a sectional view of a rotary index plate, showing a conventional braking device and a bearing device;

Fig. 2 is the three-dimensional combination diagram of the index plate of the present utility model;

Fig. 3 is the three-dimensional sectional view of Fig. 2;

Fig. 4 is the plane sectional view of Fig. 2;

Fig. 5 is an enlarged view of part of the brake mechanism in Fig. 4, showing the unbraked state;

Figure 6 is an enlarged view of part of the brake mechanism in Figure 4, showing the braked state; and

FIG. 7 is an enlarged view of a part of the bearing mechanism in FIG. 4 . the

【Symbol Description】

1: Rotary indexing plate

2: Dial

11: Base

12: Shaft

13: turntable

14: Bearing device

15: Brake pressure ring

16: brake device

21: Base

22: Spindle

23: Working disk

24: brake mechanism

25: Reset mechanism

26: transmission mechanism

27: Bearing mechanism

141: bearing seat

142: Known Bearing Cap

143: Known bearing piece

144: Bearing needle

161: Brake bottom plate

162: Runner

163: brake piston

164: brake lining

240: brake parts

241: Brake Bottom Cover

242: Piston

243: channel

244: The first inner brake pad

245: Gasket

246: Second inner brake pad

247: Outer brake pads

248: Gap

249: hole

251: Cylindrical member

252: elastic member

261: worm

262: worm gear

271: Bearing cap

272: Bearing piece

273: First rolling member

274: Second rolling member

275: The third rolling member

276: Retainer

Detailed ways

The aforementioned and other technical contents, features and functions of the present utility model will be clearly understood in the following detailed description of preferred embodiments with reference to the drawings. the

As shown in Figures 2, 3, and 4, the indexing plate 2 of the present invention includes a base 21, a main shaft 22 partially accommodated in the base 21, a working disc 23 fixed on one end of the main shaft 22, and a work disc 23 installed on the main shaft. The brake mechanism 24 at the other end of 22, a plurality of resetting mechanisms 25 connected to the brake mechanism 24, a transmission mechanism 26 arranged between the main shaft 22 and the base 21, assembled between the base 21 and the main shaft 22 for supporting the main shaft 22 is a bearing mechanism 27 that rotates relative to the base 21. the

As shown in Figures 3, 4 and 5, the brake mechanism 24 includes an annular brake part 240 fixed on the other end of the main shaft 22, an annular brake bottom cover 241 fixed on the base 21 and adjacent to the brake part 240, slidable The annular piston 242 that is housed in the recess of the brake bottom cover 241, the channel 243 that is formed in the brake bottom cover 241 and communicates with the recess of the brake bottom cover 241, and the ring that is fixed to the brake member 240 and faces the piston 242 in sequence A first inner brake pad 244 , an annular spacer 245 , a second inner brake pad 246 , and an outer brake pad 247 fixed on the base 21 . Wherein the first inner brake pad 244, the second inner brake pad 246, and the outer brake pad 247 are collectively referred to as brake pads, so the brake mechanism 24 of the present invention has multiple brake pads. The inner diameters of the first inner brake pad 244, the spacer 245, and the second inner brake pad 246 are approximately the same, and the parts near the inner diameter are fixed to the brake piece 240, but the first inner brake pad 244 and the second inner brake pad The outer diameter of 246 is larger than the outer diameter of spacer 245 , so a gap 248 is formed between the first inner brake pad 244 and the second inner brake pad 246 . Furthermore, the part of the outer brake pad 247 near the outer diameter is fixed on the base 21, but the inner diameter of the outer brake pad 247 is smaller than the outer diameters of the first and second inner brake pads 244, 246, so the outer brake pad 247 is close to the inner diameter of the outer brake pad 247. A portion of the brake pad is accommodated in the gap 248 and overlaps the portion of the first and second inner brake pads 244, 246 close to their outer diameters. In addition, the thickness of the spacer 245 is slightly larger than that of the outer brake pad 247, so when the piston 242 is not in motion, the overlapping parts of the outer brake pad 247 and the first and second inner brake pads 244, 246 are not in contact with each other. the

The size of the outer diameter and the inner diameter of the piston 242 of the present utility model is designed according to the situation when the index plate 2 is externally connected to the air pressure source, so that the thrust of the piston 242 can push the first inner brake pad 244, the outer brake pad 247, and The second inner brake pad 246 is pressed against the base 21 to generate sufficient frictional force when the overlapping area contacts to form a stable braking state; because the pressure of the air pressure source is less than the pressure of the oil pressure source, the piston of the utility model The size difference between the outer diameter and inner diameter of 242 will be larger than the size difference designed based on the external oil pressure source. As for the thickness of the piston 242, the dimensional strength of other components of the brake mechanism 24, the strength of fixing each other between these components, and the fixing strength of these components to the periphery, then according to the reference plate 2 with the above-mentioned piston diameter size circumscribed on When the oil pressure source is used as a benchmark to design; because the pressure of the oil pressure source is greater than the pressure of the air pressure source, the component size of the brake mechanism 24 of the present utility model (except the size of the outer diameter and inner diameter of the piston 242) and its fixing strength All are larger than the size designed based on the external air pressure source, so that it can withstand the greater pressure of the oil pressure source. Therefore, the index plate 2 of the present invention has the advantage that the user can connect any one of the air pressure source or the oil pressure source externally. the

The resetting mechanisms 25 are arranged in a circular ring spaced apart from each other. Each reset mechanism 25 includes a cylindrical member 251 that is closed at one end and opened at the other end, and an elastic member 252 accommodated in the cylindrical member 251 . The cylindrical member 251 is slidably received in the base 21 , and the closed end of the cylindrical member 251 passes through the hole 249 of the outer brake pad 247 . One end of the elastic member 252 abuts against the base 21 , and the other end abuts against the inner wall of the closed end of the cylindrical member 251 , so that the outer wall of the closed end of the cylindrical member 251 can always abut against the piston 242 . the

The transmission mechanism 26 includes a worm 261 externally connected to a power source (not shown) such as a motor, and a worm wheel 262 fixed to the main shaft 22 . Wherein the worm 261 and the worm wheel 262 mesh with each other. the

As shown in Figures 3, 4 and 7, the bearing mechanism 27 includes an annular bearing cover 271 fixed on the main shaft 22, an annular bearing piece 272 fixed on the base 21, and a second ring between the bearing cover 271 and the bearing piece 272. A rolling member 273, a second rolling member 274 located between the bearing piece 272 and the main shaft 22 and whose longitudinal direction is perpendicular to the longitudinal direction of the first rolling member 273, and a second rolling member 274 located between the bearing piece 272 and the main shaft 22 and whose longitudinal direction is perpendicular to the second rolling member 273 A third rolling member 275 in the longitudinal direction of the member 274, and a retainer 276 that limits each rolling member 273, 274, 275. the

In other embodiments, there may be only one or more than three inner brake pads, and when there are more than three inner brake pads, the number of outer brake pads 247 may increase accordingly. The brake member 240 can be omitted, and the inner brake pad can be directly fixed on the main shaft 22 . The overlapping area of the brake pad and its corresponding component can be sandblasted to increase the coefficient of friction. The longitudinal directions of the first, second and third rolling members 273 , 274 , 275 can form angles other than 90 degrees and 180 degrees with each other, that is, their longitudinal directions can be inclined to each other. the

Instructions

As shown in Figures 4 and 5, when the external air pressure source or oil pressure source (not shown) does not supply fluid to the index plate 2, the elastic restoring force of the elastic member 252 makes the cylindrical member 251 push the piston 242 to the brake bottom. One side of the communication channel 243 of the cavity of the cover 241, so the piston 242, the first inner brake pad 244, the outer brake pad 247, the second inner brake pad 246, and the base 21 have no substantial relationship with each other in the overlapping area. contact, that is, in this state, the braking mechanism 24 does not play a braking role. Therefore, when an external power source (not shown) drives the worm 261 to drive the worm wheel 262 , the main shaft 22 fixed to the worm wheel 262 can rotate along with the worm wheel 262 . As shown in Figures 4 and 7, the bearing cover 271 is fixed on the main shaft 22, the bearing piece 272 is fixed on the base 21, and the first, second and third rolling members 273, 274, 275 respectively support and constrain the three surfaces of the bearing piece 272, This enables the main shaft 22 to rotate relative to the base 21 with high precision. In addition, because the second and third rolling members 274, 275 are in direct contact with the main shaft 22, instead of the bearing pin 144 in the prior art contacting the bearing housing 141 (Fig. 1), the bearing mechanism 27 of the indexing plate 2 of the present utility model does not The well-known bearing seat 141, that is, the number of parts of the bearing mechanism 27 of the present utility model is relatively small, so the matching surfaces during assembly are also small, so that the division accuracy of the index plate 2 and the precision of the work plate 23 after assembly are high. . On the other hand, because the utility model has no known bearing seat 141, so the inside of index plate 2 has larger space to accommodate other components that bearing mechanism 27 comprises, so that the size of these components can be compared with conventional ones. Large, so it can bear larger loads. the

As shown in Figures 4, 5, and 7, when the main shaft 22 rotated relative to the base 21 under the support of the bearing mechanism 27, the brake member 240 and the working disc 23 fixed on the main shaft 22 also rotated with the main shaft 22, of course The first and second inner brake pads 244 , 246 fixed to the brake member 240 also rotate together with the brake member 240 . the

As shown in Figures 4 and 6, when the work disk 23 rotates to a predetermined angle, the external power source no longer drives the worm 261, and the aforementioned rotatable components also stop moving. At this time, the external air pressure source or oil pressure A source may supply fluid pressure to dial 2 via channel 243 . The fluid pressure represented by the continuous arrow (FIG. 6) overcomes the elastic force of the elastic member 252 toward the piston 242, and moves the piston 242 to the side of the first inner brake pad 244 in the cavity of the brake bottom cover 241, and makes the piston 242 withstands the first inner brake pad 244. Because each brake pad is slightly flexible, the movement of the piston 242 will cause the piston 242, the first inner brake pad 244, the outer brake pad 247, the second inner brake pad 246, and the base 21 to be in close contact with each other in the overlapping area, And the braking effect is generated by the friction force of the contact surface. At this time, the brake mechanism 24 of the present utility model has four areas where the braking effect is produced: (1) the area where the piston 242 and the first inner brake pad 244 face each other, (2) the first inner brake pad 244 and the outer brake pad 247, (3) the area where the outer brake pad 247 and the second inner brake pad 246 face each other, and (4) the area where the second inner brake pad 246 and the base 21 face each other. Because there are more areas where the braking effect is produced than those known, the braking effect is excellent, so that the brake member 240, the main shaft 22, and the working disc 23 fixed by the first and second inner brake pads 244, 246 will not be able to have any slight movement. , so the accuracy of positioning processing can be ensured. On the other hand, in order to ensure that the surfaces of the four regions are in close contact, the brake pads can be slightly flexible, and this flexibility can just absorb the vibration generated by the cutting force during processing, so the positioning processing accuracy can be further improved . the

When the processing is completed, the air pressure source or the oil pressure source stops supplying fluid to the index plate 2, and the elastic member 252 of the reset mechanism 25 cooperates with the cylindrical member 251 to push the piston 242 to one of the concave communication passages 243 of the brake bottom cover 241. side, the fluid is discharged from the recess of the brake bottom cover 241 along the channel 243, so that the piston 242, the first inner brake pad 244, the outer brake pad 247, the second inner brake pad 246, and the base 21 do not contact each other, so that Release the brake action of the brake mechanism 24, and return to the unbraked state as shown in FIG. 5 . the

But above-mentioned person, only preferred embodiment of the present utility model, when can not limit the scope of the present utility model implementation with this, promptly all simple equivalents done according to the utility model patent scope and the utility model description content Changes and modifications should still fall within the scope covered by the utility model patent. the

Claims (15)

1. A kind of index plate, is characterized in that, comprises: base; the main shaft is rotatably arranged on the base; a bearing mechanism mounted between the base and the main shaft, the bearing mechanism including at least one rolling member for direct contact with the main shaft; a transmission mechanism for driving the spindle; and A brake mechanism is mounted between the base and the spindle, the brake mechanism is operable to prevent movement of the spindle. the 2. The indexing plate according to claim 1, wherein the bearing mechanism comprises a bearing cover fixed to the main shaft, a bearing piece fixed to the base, a first rolling bearing between the bearing cover and the bearing piece. member, a second rolling member located between the bearing piece and the main shaft, and a third rolling member located between the bearing piece and the main shaft and whose longitudinal direction is different from that of the second rolling member. the 3. The index plate according to claim 2, wherein the longitudinal direction of the third rolling member is perpendicular to the longitudinal direction of the second rolling member and parallel to the longitudinal direction of the first rolling member. the 4. The indexing plate according to claim 1, 2, or 3, wherein the brake mechanism comprises a plurality of brake pads, at least one brake pad in the multiple brake pads is connected to the main shaft, when the at least A brake pad prevents the spindle from moving when the brake is applied. the 5. The indexing plate according to claim 4, wherein the brake mechanism comprises a first inner brake pad connected to the main shaft and an outer brake pad fixed on the base, the first inner brake pad and the first inner brake pad The outer brake pads overlap at least partially. the 6. The indexing plate according to claim 5, wherein the brake mechanism further comprises a second inner brake pad connected to the main shaft, and the outer brake pad is located between the first inner brake pad and the second inner brake pad. between the brake pads. the 7. The indexing plate according to claim 6, wherein the brake mechanism further comprises a brake bottom cover fixed on the base and a piston slidably accommodated in the brake bottom cover, and the piston can push contact the first inner brake pad, make the first inner brake pad, the outer brake pad, and the second inner brake pad contact each other, and make the second inner brake pad contact the base. the 8. The indexing plate as claimed in claim 6, wherein the size of the piston is sufficient to enable the thrust of the piston to move the first inner brake pad, the outer brake pad, and the outer brake pad when the indexing plate is connected with an air pressure source The brake pad, and the second inner brake pad abut against the base, and the strength of the components included in the brake mechanism and the fixation of the components to adjacent parts is sufficient to withstand the oil pressure external to the indexing plate source pressure. the 9. The indexing plate of claim 7, wherein the first inner brake pad, the outer brake pad, and the second inner brake pad are flexible to absorb vibration during processing. the 10 . The indexing plate as claimed in claim 7 , wherein the brake mechanism further comprises a brake member fixed to the main shaft, and the first inner brake pad and the second inner brake pad are fixed to the brake member. 11 . the 11. The indexing plate according to claim 10, wherein the first inner brake pad, the second inner brake pad, and the outer brake pad are annular, and the first inner brake pad and the second inner brake pad The outer brake pad is fixed to the brake part near its inner diameter, and the outer brake pad is fixed to the base with a part near its outer diameter. The outer diameters of the first inner brake pad and the second inner brake pad are larger than the outer diameter. The inner diameter of the brake pad. the 12. The index plate according to claim 11, wherein the brake mechanism further comprises a spacer between the first inner brake pad and the second inner brake pad, and a spacer formed in the brake member. A channel, one end of the channel communicates with the piston, and the other end of the channel can be externally connected to an air pressure source or an oil pressure source. the 13. The indexing plate according to claim 11, further comprising a reset mechanism, one end of the reset mechanism contacts the base, and the other end of the reset mechanism contacts the piston. the 14. The index plate according to claim 13, wherein the reset mechanism comprises a cylindrical member and an elastic member accommodated in the cylindrical member. the 15. The indexing table of claim 4, wherein the transmission mechanism comprises a worm gear fixed to the main shaft and a worm engaged with the worm gear. the

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