Electric spindle band-type brake auxiliary device

Abstract

The invention discloses an electric spindle band-type brake auxiliary device, and belongs to the technical field of spindle band-type brakes. Comprising a machine tool body, the machine tool body is in power connection with an electric spindle and a band-type brake device, the middle of the machine tool body is of a through hollow structure to form a brake cavity, the band-type brake device is fixed to the machine tool body, the electric spindle is located in the brake cavity, the brake sleeve is located in the brake cavity and arranged outside the electric spindle in a sleeving mode, and a gap exists between the brake sleeve and the electric spindle. The adjusting plate is arranged on the side, away from the machine tool body, of the band-type brake device and fixed to the end of the brake sleeve, and the rotating ring is arranged on the side face, facing the band-type brake device, of the adjusting plate. Compared with the prior art, the brake sleeve is convenient to disassemble and assemble, meanwhile, when the brake sleeve is normally used, the adjusting plate can be manually rotated to drive the brake sleeve to rotate, so that the friction surface of the brake sleeve and the electric spindle is adjusted during emergency braking every time, the eccentric wear phenomenon of the brake sleeve is avoided, and the service life of the brake sleeve is prolonged.

Description

Technical Field

[0001] The invention relates to an electric spindle brake auxiliary device, belonging to the technical field of spindle brakes. Background Art

[0002] The holding brake is a common braking device for rotating machinery, which is mainly used to ensure that the rotating machinery will not continue to rotate due to inertia or load in an emergency.

[0003] Conventional brakes usually limit the rotation of the shaft by applying pressure to the shaft to increase friction. Usually, the built-in friction plate is used to clamp the spindle for braking. However, the operation of replacing the friction plate structure after long-term use is relatively cumbersome, making the maintenance of the machine tool electric spindle brake difficult. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an electric spindle brake auxiliary device, which solves the problem in the prior art that the friction plate of the brake needs to be replaced after long-term use, and the operation of replacing the friction plate structure is relatively cumbersome.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: an electric spindle brake auxiliary device, comprising

[0006] The main body of the machine tool is connected to the electric spindle.

[0007] The brake device has a hollow structure in the middle to form a brake cavity. The brake device is fixed on the machine tool body and the electric spindle is located inside the brake cavity.

[0008] The brake sleeve is located inside the brake cavity. The brake sleeve is sleeved on the outside of the electric spindle. There is a gap between the brake sleeve and the electric spindle.

[0009] The adjustment plate is arranged on the side of the brake device away from the machine tool body, and the adjustment plate is fixed to the end of the brake sleeve.

[0010] The rotating ring is arranged on the side of the adjusting plate facing the brake device, and the rotating ring is rotatably connected with the brake device.

[0011] The limit bolt hole is opened on the connection surface between the brake device and the rotating ring.

[0012] The connecting bolt has threads arranged on the adjusting plate, and the end of the connecting bolt can extend into the limiting bolt hole.

[0013] The sliding cavity is connected to and opened on the opposite side of the brake cavity, and a clamping structure for pressing the brake sleeve toward the electric spindle is arranged in the sliding cavity.

[0014] By adopting the above technical solution, when the machine tool main body is in use, the motorized spindle rotates normally. When the motorized spindle needs to be emergently braked, the clamping structure acts to press and clamp the brake sleeve towards the motorized spindle, causing the motorized spindle to lock. Since the automatic clamping block is installed in the brake device, the maintenance and replacement operations are relatively cumbersome. Therefore, by adding a brake sleeve between the automatic clamping block and the motorized spindle, it is possible to prevent the automatic clamping block from directly participating in the frictional locking, avoiding rapid wear of the automatic clamping block. When the brake sleeve is worn, by screwing out the connecting bolts, the adjusting plate and the brake cavity can be removed axially along the motorized spindle, and then replaced. The disassembly and assembly operations are relatively convenient. At the same time, when the brake sleeve is in normal use, the adjusting plate can be manually rotated to drive the brake sleeve to rotate, thereby adjusting the friction surface between the brake sleeve and the motorized spindle during each emergency braking, avoiding eccentric wear of the brake sleeve, and being beneficial to improving the service life of the brake sleeve.

[0015] The present invention is further configured as: The clamping structure includes

[0016] an automatic clamping block, slidably arranged in the sliding cavity, and the end of the automatic clamping block extends into the brake cavity.

[0017] a tension spring, arranged in the sliding cavity, with both ends of the tension spring fixedly connected to the automatic clamping block and the inner wall of the sliding cavity respectively. The tension spring applies an elastic force to the automatic clamping block in the direction away from the motorized spindle.

[0018] an intermediate cavity, opened in the brake device, and the intermediate cavity communicates with the two opposite sliding cavities, and the communication part is located on the side of the automatic clamping block away from the brake cavity.

[0019] a hydraulic connection port, fixed on the brake device, and the hydraulic connection port communicates with the intermediate cavity.

[0020] By adopting the above technical solution, the hydraulic connection port is connected to an external hydraulic device. When it is necessary to emergently brake the motorized spindle, the external hydraulic device introduces hydraulic oil into the intermediate cavity through the hydraulic connection port, and then into the sliding cavity through the intermediate cavity. Under the pressure of the hydraulic oil, the automatic clamping block moves towards the brake sleeve, causing the automatic clamping block to apply pressure to the brake sleeve. After the brake sleeve is subjected to the pressure, it deforms towards the motorized spindle and presses against the surface of the motorized spindle. At this time, the motorized spindle is decelerated by the frictional force until it locks, achieving the purpose of emergency braking. When the braking is over, the external hydraulic device reduces the pressure, and the hydraulic oil flows back to the hydraulic device through the above path. At this time, the tension spring makes the automatic clamping block move towards the direction away from the brake sleeve under the elastic action, releasing the locking of the motorized spindle, and at this time the motorized spindle can rotate normally.

[0021] The present invention is further configured such that: a manual clamping block is slidably arranged along the radial direction on the inner wall of the braking cavity. One end of the manual clamping block extends to the outside of the brake device, and the other end of the manual clamping block extends into the braking cavity. A reset cavity is laterally arranged on the manual clamping block. A reset plate fixed to the manual clamping block is slidably arranged in the reset cavity. A reset spring is fixedly connected between the reset plate and the inner wall of the reset cavity. The reset spring applies an elastic force to the reset plate in a direction away from the electric spindle. A pressing rod is hinged on the outside of the brake device, and the pressing rod can abut against the end of the manual clamping block.

[0022] By adopting the above technical solution, when the external hydraulic device cannot be used normally, the user can manually flip the pressing rod to make the pressing rod abut against the manual clamping block and press it forcefully in the direction of the electric spindle. At this time, the manual clamping block presses the braking sleeve against the surface of the electric spindle for frictional braking under the action of the pressure, so that normal braking can still be carried out when the hydraulic device cannot be used, improving the reliability of the brake auxiliary device.

[0023] The present invention is further configured such that: an inflation cavity is formed in the brake device. The inflation cavity is communicated with the position where the manual clamping block is located. A flexible shielding sheet that closes the inflation cavity is fixedly arranged at the connection between the inflation cavity and the manual clamping block. A gas guide pipe communicated with the inflation cavity is fixedly arranged on the outside of the brake device, and a one-way valve is fixedly arranged at the end of the gas guide pipe.

[0024] By adopting the above technical solution, the one-way valve can be communicated with an external gas supply device, and the external gas supply device can introduce gas into the inflation cavity to make the air pressure in the inflation cavity greater than the atmospheric pressure. When starting to brake the electric spindle, due to the clamping of the two automatic clamping blocks, the braking sleeve deforms. At this time, the braking sleeve bends in the direction of the manual clamping block. Since the circumference of the braking sleeve remains unchanged, the braking sleeve pushes the manual clamping block away from the electric spindle at this time. The manual clamping block exerts extrusion on the flexible shielding sheet, and at this time the flexible shielding sheet undergoes elastic deformation and partially retracts into the inflation cavity, so that the braking sleeve can deform normally, which is beneficial to making the clamped part of the braking sleeve fully fit the surface of the electric spindle and improving the braking effect.

[0025] The present invention is further configured such that: a ring-shaped connecting block is arranged on one side of the braking cavity close to the machine tool body, and the ring-shaped connecting block is fixedly connected to the end of the braking sleeve.

[0026] By adopting the above technical solution, by fixedly connecting the ring-shaped connecting block to the end of the braking sleeve, both ends of the braking sleeve are supported under normal conditions, improving the stability of the braking sleeve and preventing the braking sleeve from bending and interfering with the rotation of the electric spindle when not in use.

[0027] The present invention is further configured such that: an exhaust passage extending towards the annular connecting block is provided on the inner wall of the inflation chamber, a closing structure is arranged in the exhaust passage, an air inlet chamber is circumferentially formed on one side of the annular connecting block facing the exhaust passage around the electric spindle, the air inlet chamber is communicated with the exhaust passage, a diversion passage is arranged in the annular connecting block, one end of the diversion passage is communicated with the air inlet chamber, and the other end of the diversion passage is communicated with the gap between the brake sleeve and the electric spindle.

[0028] The present invention is further configured such that: the closing structure includes

[0029] a movable baffle plate arranged at the connection between the exhaust passage and the inflation chamber,

[0030] a fixed pipe fixed on the side of the movable baffle plate away from the inflation chamber, the inside of the fixed pipe is a hollow structure, the hollow structure penetrates through the movable baffle plate and is communicated with the inflation chamber, and a plurality of exhaust holes are radially arranged in the fixed pipe.

[0031] a fixed baffle plate fixed on the side of the exhaust passage facing the annular connecting block, and a compression spring is fixedly arranged between the fixed baffle plate and the movable baffle plate.

[0032] an outer sealing sleeve fixed on the side of the fixed baffle plate facing the movable baffle plate, the outer sealing sleeve is sleeved outside the fixed pipe and closes the exhaust holes.

[0033] a pneumatic balance passage, one end of which is communicated with the space between the movable baffle plate and the fixed baffle plate, and the other end of which is communicated with the brake chamber.

[0034] The present invention is further configured such that: elastic sealing sheets are fixedly arranged on the opposite sides of the connection between the air inlet chamber and the exhaust passage, and the two elastic sealing sheets are in mutual contact and the contact ends are bent towards the direction of the air inlet chamber.

[0035] By adopting the above technical solution, under normal conditions, the movable baffle has a tendency to move towards the inflatable cavity under the elastic action of the pressure spring. At this time, the fixed pipe is located inside the outer seal sleeve, the exhaust hole is closed by the outer seal sleeve, and the two elastic sealing sheets abut against each other to close the exhaust passage. When an emergency braking occurs, the braking sleeve squeezes the manual clamping block towards the flexible shielding sheet. At this time, part of the flexible shielding sheet retracts into the inflatable cavity to increase the air pressure in the inflatable cavity. At this time, the air pressure in the inflatable cavity further increases, causing the movable baffle to move towards the intake cavity. The gas between the movable baffle and the fixed baffle is discharged through the air pressure balance channel. The movable baffle drives the fixed pipe to move towards the intake cavity, causing the exhaust hole to move out of the inside of the outer seal sleeve. At this time, the end of the fixed pipe abuts against and applies pressure to the elastic sealing sheet, finally causing the two elastic sealing sheets to separate from each other. The part of the fixed pipe with the exhaust hole enters the intake cavity. At this time, the gas in the inflatable cavity enters the intake cavity through the fixed pipe and the exhaust hole. The gas entering the intake cavity is discharged through the diversion channel into the gap between the braking sleeve and the electric spindle, and finally discharged from the opening at the end of the braking cavity away from the machine tool body. During the gas discharge process, part of the heat generated by the friction between the electric spindle and the braking sleeve can be carried away, making it more difficult for the braking sleeve to generate braking heat attenuation, which is beneficial to improving the braking performance of the braking sleeve.

[0036] The present invention is further arranged such that the annular connecting block is rotatably connected to the brake device. A plurality of plug-in blocks are fixed on the side of the automatic clamping block facing the electric spindle. A plurality of slots are provided on the side of the braking sleeve away from the electric spindle. The slots extend along the axial direction of the electric spindle, and the plug-in blocks can be inserted into the slots.

[0037] By adopting the above technical solution, since the annular connecting block is rotatably connected to the brake device, the braking sleeve can rotate along the axis of the electric spindle, making the opening of the slot unable to be accurately aligned with the plug-in block. At this time, when the braking sleeve abuts against the electric spindle after being subjected to a clamping force, the plug-in block abuts against the braking sleeve. When the clamping force is insufficient and the braking sleeve and the manual clamping block slide relative to each other, when the manual clamping block moves to the opening of the slot, the manual clamping block can enter the slot to form a plug-in connection. At this time, the braking sleeve cannot slide relative to the manual clamping block, causing the automatic clamping block and the braking sleeve to be stationary synchronously, which is beneficial to further improving the braking effect of the braking sleeve.

[0038] The beneficial effects of the present invention are as follows: When the machine tool main body is in use, the motorized spindle rotates normally. When the motorized spindle needs to be emergently braked, the clamping structure acts to press and clamp the braking sleeve towards the motorized spindle, causing the motorized spindle to lock. Since the automatic clamping block is installed in the brake device, the maintenance and replacement operations are relatively cumbersome. Therefore, by adding a braking sleeve between the automatic clamping block and the motorized spindle, it is possible to avoid the direct participation of the automatic clamping block in frictional locking, preventing rapid wear of the automatic clamping block. When the braking sleeve is worn, by screwing out the connecting bolts, the adjusting plate and the braking cavity can be removed axially along the motorized spindle, and then replaced. The disassembly and assembly operations are relatively convenient. At the same time, when the braking sleeve is in normal use, the adjusting plate can be manually rotated to drive the braking sleeve to rotate, thereby adjusting the friction surface between the braking sleeve and the motorized spindle during each emergency braking, avoiding eccentric wear of the braking sleeve, and being beneficial to improving the service life of the braking sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of the present invention;

[0040] Figure 2 is a partial structural sectional view of the present invention;

[0041] Figure 3 is Figure 2 an enlarged structural view of part A in

[0042] Figure 4 is a structural sectional view of the automatic clamping block of the present invention;

[0043] Figure 5 is a partial structural sectional view of the sliding cavity and the intermediate cavity of the present invention.

[0044] In the figure: 10, machine tool main body; 11, brake device; 12, support seat; 13, motorized spindle; 14, air guide pipe; 15, one-way valve; 20, braking cavity; 21, braking sleeve; 22, adjusting plate; 23, rotating ring; 24, connecting bolt; 25, limit bolt hole; 26, slot; 27, manual clamping block; 28, pressing rod; 29, reset cavity; 30, reset spring; 31, reset plate; 32, intermediate cavity; 33, hydraulic connection port; 34, sliding cavity; 35, tension spring; 36, automatic clamping block; 37, plug-in block; 38, inflation cavity; 39, flexible shielding piece; 40, exhaust passage; 41, movable baffle; 42, fixed pipe; 43, exhaust hole; 44, fixed baffle; 45, outer sealing sleeve; 46, pressure spring; 47, air pressure balance passage; 48, elastic sealing piece; 49, annular connecting block; 50, intake cavity; 51, diversion passage. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] In order to easily understand the technical means, creative features, achieved objectives and effects of the present invention, the present invention will be further described below in conjunction with specific illustrations.

[0046] As Figures 1 to 2 shown, an electric spindle brake auxiliary device includes a machine tool main body 10, a brake device 11, a brake sleeve 21, an adjusting plate 22, a rotating ring 23, a connecting bolt 24, a limit bolt hole 25 and a sliding cavity 34. The machine tool main body 10 is detachably fixed on the installation surface. The machine tool main body 10 is provided with an output end, and an electric spindle 13 is power-connected to the output end. The middle part of the brake device 11 is a through-type hollow structure, and the hollow structure forms a brake cavity 20. The brake device 11 is fixed on the machine tool main body 10 and the electric spindle 13 is located inside the brake cavity 20. The extending direction of the brake cavity 20 is the same as the axial direction of the electric spindle 13. When there is no connection point on the external machine tool structure to install the brake device 11, the brake device 11 can be selected in the form with a support seat 12. The brake device 11 can be fixed to an installation frame independent outside the machine tool through the support seat 12, which increases the installation method of the brake device 11 and improves the installation convenience of the brake device 11.

[0047] As Figures 1 to 2 shown, the brake sleeve 21 is located inside the brake cavity 20. The brake sleeve 21 is sleeved outside the electric spindle 13, and there is a gap between the brake sleeve 21 and the electric spindle 13. The adjusting plate 22 is arranged on the side of the brake device 11 away from the machine tool main body 10, and the adjusting plate 22 is fixed to the end of the brake sleeve 21. The rotating ring 23 is arranged on the side of the adjusting plate 22 facing the brake device 11. The rotating ring 23 is in contact with the adjusting plate 22, and the rotating ring 23 is rotatably connected to the brake device 11. The limit bolt hole 25 is opened on the connection surface of the brake device 11 facing the rotating ring 23. A plurality of limit bolt holes 25 are arranged at equal intervals along the circumference of the rotating ring 23. The connecting bolt 24 is threadedly arranged on the adjusting plate 22. The end of the connecting bolt 24 can extend through the rotating ring 23 and into the limit bolt hole 25 to fix the adjusting plate 22 and the rotating ring 23 to the brake device 11. The end of the connecting bolt 24 can only extend into the rotating ring 23, so that the rotating ring 23 and the adjusting plate 22 can rotate relative to the brake device 11. The sliding cavity 34 is communicated and opened on the opposite side of the brake cavity 20, and a clamping structure for pressing the brake sleeve 21 towards the electric spindle 13 is arranged in the sliding cavity 34.

[0048] As Figures 4 to 5As shown, the clamping structure includes an intermediate cavity 32, a hydraulic connection port 33, a tension spring 35, and an automatic clamping block 36. The automatic clamping block 36 is slidably arranged in a sliding cavity 34, and the connection between the automatic clamping block 36 and the sliding cavity 34 is sealed. The end of the automatic clamping block 36 extends into the braking cavity 20. The tension spring 35 is arranged in the sliding cavity 34, and both ends of the tension spring 35 are fixed to the automatic clamping block 36 and the inner wall of the sliding cavity 34 respectively. The tension spring 35 applies an elastic force to the automatic clamping block 36 in a direction away from the electric spindle 13. The intermediate cavity 32 is opened in the brake device 11. The intermediate cavity 32 communicates with two opposite sliding cavities 34, and the communication part is located on the side of the automatic clamping block 36 away from the braking cavity 20. The hydraulic connection port 33 is fixed on the brake device 11. The hydraulic connection port 33 communicates with the intermediate cavity 32. The hydraulic connection port 33 is connected to an external hydraulic device, and the external hydraulic device can introduce hydraulic oil into the hydraulic connection port 33 to make the automatic clamping block 36 perform a clamping action in the direction towards the electric spindle 13.

[0049] As Figure 2 shown, a manual clamping block 27 is slidably arranged along the radial direction on the inner wall of the braking cavity 20. One end of the manual clamping block 27 extends outside the brake device 11, and the other end of the manual clamping block 27 extends into the braking cavity 20. A reset cavity 29 is laterally arranged on the manual clamping block 27. A reset plate 31 fixed to the manual clamping block 27 is slidably arranged in the reset cavity 29. A reset spring 30 is fixedly connected between the reset plate 31 and the inner wall of the reset cavity 29. The reset spring 30 applies an elastic force to the reset plate 31 in a direction away from the electric spindle 13. A pressing rod 28 is hinged on the outside of the brake device 11, and the pressing rod 28 can abut against the end of the manual clamping block 27.

[0050] As Figures 2 to 3 shown, an inflation cavity 38 is opened in the brake device 11. The inflation cavity 38 is communicated with the position where the manual clamping block 27 is located. A flexible shielding sheet 39 that closes the inflation cavity 38 is fixedly arranged at the connection between the inflation cavity 38 and the manual clamping block 27. An air guide pipe 14 communicated with the inflation cavity 38 is fixedly arranged on the outside of the brake device 11. A one-way valve 15 is fixedly arranged at the end of the air guide pipe 14. The one-way valve 15 can be communicated with an external air supply device, and the one-way valve 15 can make gas enter the air guide pipe 14 unidirectionally. A ring-shaped connecting block 49 is arranged on the side of the braking cavity 20 close to the machine tool body 10. The ring-shaped connecting block 49 is fixedly connected to the end of the braking sleeve 21. The side of the ring-shaped connecting block 49 facing the electric spindle 13 is divided into an abutting type and a non-abutting type. By fixing the ring-shaped connecting block 49 at the end of the braking sleeve 21, both ends of the braking sleeve 21 are supported under normal conditions, improving the stability of the braking sleeve 21 and avoiding bending of the braking sleeve 21 when not in use and interfering with the rotation of the electric spindle 13.

[0051] As Figure 3As shown, an exhaust passage 40 extending towards the annular connection block 49 is provided on the inner wall of the inflatable cavity 38. A closing structure is arranged in the exhaust passage 40. An intake cavity 50 is circumferentially formed on the side of the annular connection block 49 facing the exhaust passage 40 around the electric spindle 13. The intake cavity 50 is communicated with the exhaust passage 40. A diversion passage 51 is arranged in the annular connection block 49. One end of the diversion passage 51 is communicated with the intake cavity 50, and the other end of the diversion passage 51 is communicated with the gap between the brake sleeve 21 and the electric spindle 13. The closing structure includes a movable baffle 41, a fixed pipe 42, a fixed baffle 44, an outer sealing sleeve 45 and a pneumatic balance passage 47. The movable baffle 41 is slidably arranged at the connection of the exhaust passage 40 and the inflatable cavity 38 along the extending direction of the exhaust passage 40. The connection between the movable baffle 41 and the inner wall of the exhaust passage 40 is sealed. The fixed pipe 42 is fixed on the side of the movable baffle 41 away from the inflatable cavity 38. The inside of the fixed pipe 42 is a hollow structure, and the hollow structure penetrates through the movable baffle 41 and is communicated with the inflatable cavity 38. A plurality of exhaust holes 43 are arranged in a radial through manner on the side of the fixed pipe 42 away from the movable baffle 41. The fixed baffle 44 is fixed on the side of the exhaust passage 40 facing the annular connection block 49. A compression spring 46 is fixedly arranged between the fixed baffle 44 and the movable baffle 41. The outer sealing sleeve 45 is fixed on the side of the fixed baffle 44 facing the movable baffle 41. The outer sealing sleeve 45 is sleeved outside the fixed pipe 42 and closes the exhaust holes 43. The inside of the outer sealing sleeve 45 is provided with a through hole penetrating the fixed baffle 44 towards the intake cavity 50, so that the end of the fixed pipe 42 can pass through the fixed baffle 44. One end of the pneumatic balance passage 47 is communicated with the space between the movable baffle 41 and the fixed baffle 44, and the other end is communicated with the brake cavity 20. The pneumatic balance passage 47 keeps the air pressure between the movable baffle 41 and the fixed baffle 44 consistent with the atmospheric pressure. Elastic sealing pieces 48 are fixedly arranged on the opposite side of the connection between the intake cavity 50 and the exhaust passage 40. The two elastic sealing pieces 48 are in contact with each other, and the contact end is bent towards the intake cavity 50.

[0052] As Figures 4 to 5As shown in the figure, the end of the annular connecting block 49 is inserted into the brake device 11 and rotatably connected to the brake device 11. A plurality of insertion blocks 37 are fixed on the side of the automatic clamping block 36 facing the motorized spindle 13. A plurality of slots 26 are provided on the side of the brake sleeve 21 away from the motorized spindle 13. The slots 26 extend along the axial direction of the motorized spindle 13, and the insertion blocks 37 can be inserted into the slots 26. Since the annular connecting block 49 is rotatably connected to the brake device 11, the brake sleeve 21 can rotate along the axis of the motorized spindle 13, so that the openings of the slots 26 and the insertion blocks 37 cannot be accurately aligned. At this time, when the brake sleeve 21 is pressed against the motorized spindle 13 after being subjected to a clamping force, the insertion block 37 abuts against the brake sleeve 21. When the clamping force is insufficient and the brake sleeve 21 and the manual clamping block 27 slide relative to each other, when the manual clamping block 27 moves to the opening of the slot 26, the manual clamping block 27 can enter the slot 26 to form an insertion. At this time, the brake sleeve 21 cannot slide relative to the manual clamping block 27, so that the automatic clamping block 36 and the brake sleeve 21 are synchronously stationary, which is beneficial to further improving the braking effect of the brake sleeve 21.

[0053] When the machine tool main body 10 is in use, the motorized spindle 13 rotates normally. When the motorized spindle 13 needs to be emergently braked, the clamping structure acts to press and clamp the brake sleeve 21 towards the motorized spindle 13, so that the motorized spindle 13 is locked. Since the automatic clamping block 36 is installed in the brake device 11, the maintenance and replacement operations are relatively cumbersome. Therefore, by adding a brake sleeve 21 between the automatic clamping block 36 and the motorized spindle 13, it is possible to prevent the automatic clamping block 36 from directly participating in the frictional locking, avoiding rapid wear of the automatic clamping block 36. When the brake sleeve 21 is worn, by unscrewing the connecting bolt 24, the adjusting plate 22 and the brake cavity 20 are removed along the axial direction of the motorized spindle 13, and then replaced. The disassembly and assembly operations are relatively convenient.

[0054] When the annular connecting block 49 is not in contact with the motorized spindle 13, the user can also manually rotate the adjusting plate 22 to drive the brake sleeve 21 to rotate, so as to adjust the friction surface position between the brake sleeve 21 and the motorized spindle 13 during each emergency braking, avoiding uneven wear of the brake sleeve 21, which is beneficial to improving the service life of the brake sleeve 21. And the adjusting plate 22 and the rotating ring 23 can be fixed to the brake device 11 by screwing the connecting bolt 24 into the limit bolt hole 25, avoiding relative sliding between the brake sleeve 21 and the automatic clamping block 36 during braking and reducing the braking effect.

[0055] When the annular connecting block 49 is in contact with the electric spindle 13, and when the connecting bolt 24 is not inserted into the limit bolt hole 25, when the electric spindle 13 rotates, it drives the annular connecting block 49 to rotate by friction. Since the electric spindle 13 and the annular connecting block 49 rotate synchronously at this time, there will be no relative sliding between the two, so a large amount of heat will not be generated due to sliding friction. Thus, the annular connecting block 49 drives the adjusting plate 22 to rotate through the brake sleeve 21. At this time, the position of the brake sleeve 21 relative to the automatic clamping block 36 can be changed, without manually rotating and adjusting the brake sleeve 21, avoiding eccentric wear and reducing the degree of manual intervention in the device, and improving the automation degree of the brake auxiliary device.

[0056] The hydraulic connection port 33 is connected to an external hydraulic device. When it is necessary to urgently brake the electric spindle 13, the external hydraulic device introduces hydraulic oil into the intermediate cavity 32 through the hydraulic connection port 33, and then into the sliding cavity 34 through the intermediate cavity 32. Under the action of the pressure of the hydraulic oil, the automatic clamping block 36 moves towards the brake sleeve 21, so that the automatic clamping block 36 applies pressure to the brake sleeve 21. After the brake sleeve 21 is subjected to pressure, it deforms towards the electric spindle 13 and is in pressing contact with the surface of the electric spindle 13. At this time, the electric spindle 13 is decelerated by the frictional force until it is locked, achieving the purpose of emergency braking. After the braking is over, the external hydraulic device reduces the pressure, and the hydraulic oil flows back to the hydraulic device through the above path. At this time, the tension spring 35 makes the automatic clamping block 36 move away from the brake sleeve 21 under the elastic action, releasing the locking of the electric spindle 13, and at this time the electric spindle 13 can rotate normally.

[0057] When the external hydraulic device cannot be used normally, the user can manually flip the pressing rod 28 to make the pressing rod 28 in contact with the manual clamping block 27, and press forcefully towards the electric spindle 13. Using the lever principle, the force exerted by the pressing rod 28 on the manual clamping block 27 is much greater than the pressing force of the user on the pressing rod 28. At this time, the manual clamping block 27 presses the brake sleeve 21 against the surface of the electric spindle 13 for frictional braking, so that normal braking can still be carried out when the hydraulic device cannot be used, improving the reliability of the brake auxiliary device under extreme working conditions.

[0058] The one-way valve 15 can communicate with an external gas supply device, and the external gas supply device can introduce gas into the inflation chamber 38, so that the air pressure in the inflation chamber 38 is greater than the atmospheric pressure. When starting to brake the motorized spindle 13, due to the clamping of the two automatic clamping blocks 36, the brake sleeve 21 deforms. At this time, the brake sleeve 21 bends towards the manual clamping block 27. Since the circumference of the brake sleeve 21 remains unchanged, the brake sleeve 21 pushes the manual clamping block 27 away from the motorized spindle 13. The manual clamping block 27 exerts extrusion on the flexible baffle 39. At this time, the flexible baffle 39 undergoes elastic deformation and partially retracts into the inflation chamber 38, so that the brake sleeve 21 can deform normally, which is beneficial to making the clamped part of the brake sleeve 21 fully fit the surface of the motorized spindle 13 and improving the braking effect.

[0059] Under normal conditions, the movable baffle 41 has a tendency to move towards the inside of the inflation chamber 38 under the elastic action of the compression spring 46. At this time, the fixed pipe 42 is located inside the outer seal 45, and the exhaust hole 43 is closed by the outer seal 45. The two elastic sealing sheets 48 are in contact with each other and close the exhaust passage 40. When an emergency braking occurs, the brake sleeve 21 squeezes the manual clamping block 27 towards the flexible baffle 39. At this time, the flexible baffle 39 partially retracts into the inflation chamber 38, increasing the air pressure in the inflation chamber 38. At this time, the air pressure in the inflation chamber 38 further increases, causing the movable baffle 41 to move towards the intake chamber 50. The gas between the movable baffle 41 and the fixed baffle 44 is discharged through the air pressure balance passage 47. The movable baffle 41 drives the fixed pipe 42 to move towards the intake chamber 50, moving the exhaust hole 43 out of the inside of the outer seal 45. At this time, the end of the fixed pipe 42 abuts against and applies pressure to the elastic sealing sheet 48, finally causing the two elastic sealing sheets 48 to separate from each other.

[0060] Then, the part of the fixed pipe 42 where the exhaust hole 43 is opened enters the air intake cavity 50. At this time, the gas in the inflation cavity 38 enters the air intake cavity 50 through the fixed pipe 42 and the exhaust hole 43. The gas entering the air intake cavity 50 is discharged through the diversion channel 51 into the gap between the brake sleeve 21 and the electric main shaft 13, and finally discharged from the opening at the end of the brake cavity 20 away from the machine tool main body 10. During the gas discharge process, part of the heat generated by the friction between the electric main shaft 13 and the brake sleeve 21 can be carried away, making it more difficult for the brake sleeve 21 to generate brake heat attenuation, which is beneficial to improving the braking performance of the brake sleeve 21. At the same time, during the process of the gas being discharged through the diversion channel 51, the annular connecting block 49 remains relatively stationary with respect to the brake sleeve 21. If the annular connecting block 49 is in contact with the electric main shaft 13, the annular connecting block 49 slides relative to the electric main shaft 13. At this time, the gas flowing through the diversion channel 51 can also cool the annular connecting block 49. When the air pressure in the inflation cavity 38 decreases, the movable baffle 41 returns to its initial position under the elastic action of the pressure spring 46, and the exhaust hole 43 is blocked and sealed by the outer sealing sleeve 45. Then, an external air supply device is used to pressurize and supply air to the one-way valve 15 to refill the gas in the inflation cavity 38.

[0061] Since the end of the fixed pipe 42 is provided with the exhaust hole 43, when at least one exhaust hole 43 moves out of the outer sealing sleeve 45 and the movable baffle 41 cannot continue to move due to the small air pressure difference between the inflation cavity 38 and the atmosphere or cannot continue to move due to structural damage, the gas in the inflation cavity 38 can also be introduced through the fixed pipe 42 into the space between the fixed baffle 44 and the elastic sealing sheet 48. At this time, an air pressure difference is generated on both sides of the elastic sealing sheet 48. Under the action of the air pressure difference, the abutting end of the elastic sealing sheet 48 is disengaged, so that the gas between the fixed baffle 44 and the elastic sealing sheet 48 enters the air intake cavity 50 through the elastic sealing sheet 48, improving the stability of cooling the brake sleeve 21 under extreme working conditions.

[0062] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope claimed by the present invention. The scope claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for an electric spindle brake, characterized in that: including a machine tool main body (10), on which a motorized spindle (13) is power-connected; a brake device (11), with a hollow structure penetrating through the middle to form a brake cavity (20), the brake device (11) is fixed on the machine tool main body (10) and the motorized spindle (13) is located inside the brake cavity (20); a brake sleeve (21), located inside the brake cavity (20), the brake sleeve (21) is sleeved outside the motorized spindle (13), and there is a gap between the brake sleeve (21) and the motorized spindle (13); an adjusting plate (22), arranged on the side of the brake device (11) away from the machine tool main body (10), the adjusting plate (22) is fixed to the end of the brake sleeve (21); a rotating ring (23), arranged on the side of the adjusting plate (22) facing the brake device (11), the rotating ring (23) is rotatably connected to the brake device (11); a limit bolt hole (25), opened on the connection surface between the brake device (11) and the rotating ring (23); a connection bolt (24), threadedly arranged on the adjusting plate (22), and the end of the connection bolt (24) can extend into the limit bolt hole (25); a sliding cavity (34), communicated and opened on the opposite side of the brake cavity (20), and a clamping structure for pressing the brake sleeve (21) towards the motorized spindle (13) is arranged in the sliding cavity (34).

2. The electro-spindle brake auxiliary device according to claim 1, characterized in that: The clamping structure includes an automatic clamping block (36), slidably arranged in the sliding cavity (34), and the end of the automatic clamping block (36) extends into the brake cavity (20); a tension spring (35), arranged in the sliding cavity (34), with both ends of the tension spring (35) fixed to the automatic clamping block (36) and the inner wall of the sliding cavity (34) respectively, and the tension spring (35) applies an elastic force to the automatic clamping block (36) in a direction away from the motorized spindle (13); an intermediate cavity (32), opened in the brake device (11), the intermediate cavity (32) communicates the two opposite sliding cavities (34), and the communication part is located on the side of the automatic clamping block (36) away from the brake cavity (20); a hydraulic connection port (33), fixed on the brake device (11), and the hydraulic connection port (33) communicates with the intermediate cavity (32).

3. An electric spindle brake auxiliary device according to claim 1, characterized in that: A manual clamping block (27) is slidably arranged along the radial direction on the inner wall of the brake cavity (20), one end of the manual clamping block (27) extends outside the brake device (11), the other end of the manual clamping block (27) extends into the brake cavity (20), a reset cavity (29) is arranged laterally on the manual clamping block (27), a reset plate (31) fixed to the manual clamping block (27) is slidably arranged in the reset cavity (29), and a reset spring (30) is fixedly connected between the reset plate (31) and the inner wall of the reset cavity (29), the reset spring (30) applies an elastic force to the reset plate (31) in a direction away from the motorized spindle (13), and a pressing rod (28) is hinged outside the brake device (11), and the pressing rod (28) can abut against the end of the manual clamping block (27).

4. The electric spindle brake auxiliary device according to claim 3, characterized in that: The brake device (11) is internally provided with an inflation cavity (38). The inflation cavity (38) is communicated with the position where the manual clamping block (27) is located. A flexible shielding piece (39) that closes the inflation cavity (38) is fixedly arranged at the connection between the inflation cavity (38) and the manual clamping block (27). A gas guide pipe (14) communicated with the inflation cavity (38) is fixedly arranged on the outer side of the brake device (11), and a one-way valve (15) is fixedly arranged at the end of the gas guide pipe (14).

5. The electro-spindle brake auxiliary device according to claim 4, characterized in that: On one side of the brake cavity (20) close to the machine tool main body (10), an annular connecting block (49) is arranged, and the annular connecting block (49) is fixedly connected to the end of the brake sleeve (21).

6. The electro-spindle brake auxiliary device according to claim 5, characterized in that: An exhaust passage (40) extending towards the annular connecting block (49) is arranged on the inner wall of the inflation cavity (38). A closing structure is arranged in the exhaust passage (40). An intake cavity (50) is circumferentially arranged on one side of the annular connecting block (49) facing the exhaust passage (40) around the electric spindle (13). The intake cavity (50) is communicated with the exhaust passage (40). A diversion passage (51) is arranged in the annular connecting block (49). One end of the diversion passage (51) is communicated with the intake cavity (50), and the other end of the diversion passage (51) is communicated with the gap between the brake sleeve (21) and the electric spindle (13).

7. An electric spindle brake auxiliary device according to claim 6, characterized in that: The closing structure includes a movable baffle (41) arranged at the connection between the exhaust passage (40) and the inflation cavity (38), a fixed pipe (42) fixed on the side of the movable baffle (41) away from the inflation cavity (38). The inside of the fixed pipe (42) is a hollow structure, and the hollow structure penetrates through the movable baffle (41) and is communicated with the inflation cavity (38). A plurality of exhaust holes (43) are arranged in the fixed pipe (42) in a radial through manner, a fixed baffle (44) fixed on the side of the exhaust passage (40) facing the annular connecting block (49). A pressure spring (46) is fixedly arranged between the fixed baffle (44) and the movable baffle (41), an outer sealing sleeve (45) fixed on the side of the fixed baffle (44) facing the movable baffle (41). The outer sealing sleeve (45) is sleeved outside the fixed pipe (42) and closes the exhaust holes (43), a gas pressure balance passage (47) with one end communicated with the space between the movable baffle (41) and the fixed baffle (44) and the other end communicated with the brake cavity (20).

8. An auxiliary device for an electric spindle brake, according to claim 7, characterized in that: Elastic sealing pieces (48) are fixedly arranged on the opposite side of the connection between the intake cavity (50) and the exhaust passage (40). The two elastic sealing pieces (48) are in mutual contact and the contact ends are bent towards the direction of the intake cavity (50).

9. The electro-spindle brake auxiliary device according to claim 2, characterized in that: The annular connecting block (49) is rotatably connected to the brake device (11). A plurality of insertion blocks (37) are fixed on the side of the automatic clamping block (36) facing the electric spindle (13). A plurality of slots (26) are arranged on the side of the brake sleeve (21) away from the electric spindle (13). The slots (26) extend along the axial direction of the electric spindle (13), and the insertion blocks (37) can be inserted into the slots (26).

Images