Hydraulic low-pressure oil type brake system for machining center cradle

Abstract

The invention discloses a hydraulic low-pressure oil type brake system for a machining center cradle, which belongs to the technical field of machining centers and comprises a brake, a brake disc and a hydraulic power system, the brake disc is arranged on a spindle of the machining center cradle, and the brake comprises a left brake hydraulic cylinder, a left brake pad, a right brake hydraulic cylinder and a right brake pad. The left brake pad and the right brake pad are located on the left side and the right side of the brake disc respectively. The hydraulic power system comprises a driver, a guide rail, a rear side piston rod, a rear side hydraulic cylinder body, a rear side hydraulic piston, a rear side hydraulic oil output pipeline, a rear side hydraulic oil return pipeline, a front side piston rod, a front side hydraulic cylinder body, a front side hydraulic piston, a front side hydraulic oil output pipeline and a front side hydraulic oil return pipeline. According to the brake system, no spring exists, the driver drives the rear side hydraulic cylinder body and the front side hydraulic cylinder body to move at the same time, and compared with the prior art, due to the fact that oil pressure is small, the oil leakage phenomenon is greatly reduced; the brake is not provided with a vent hole, so that the problem of vent hole blockage does not exist; accurate regulation and control of friction force of the left brake pad and the right brake pad are achieved through motor driving.

Description

Technical Field

[0001] The present invention relates to the technical field of machining centers, and more particularly to a cradle brake system for a machining center. Background Art

[0002] A numerically controlled machine tool, abbreviated as a computer numerical control machine tool, is an automated machine tool equipped with a program control system. The control system can logically process a program with control codes or other symbolic instructions, decode it, represent it in coded numbers, and input it into the numerical control device through an information carrier. After arithmetic processing, the numerical control device issues various control signals to control the operation of the machine tool, and automatically processes parts according to the shape and size required by the drawing. A machining center is a highly automated multi-functional numerically controlled machine tool with a tool magazine and an automatic tool changer.

[0003] The existing cradle brake system in machining centers has the following defects: Brake looseness: The reason is that the brake drum or the brake is loose, resulting in poor braking effect. Specifically, it may be caused by reduced friction of the brake, improper adjustment of the braking distance, uneven surface of the brake drum, etc.

[0004] Leakage of the braking system or blockage of the brake vent hole: The reason is dust blockage or water ingress, etc. It is necessary to regularly clean the brake vent hole to keep it unobstructed. The reason for the leakage of the braking system, in addition to the failure of the sealing ring, is also related to the oil pressure of the braking system. Relatively speaking, the higher the oil pressure, the easier it is to leak. The brake pads in the current hydraulic brake system generally use the spring return method. Therefore, when the braking system is braking, in addition to increasing the braking force, it is also necessary to overcome the spring return force. Therefore, the oil pressure required by the braking system is relatively large, and the large oil pressure is likely to cause leakage of the hydraulic oil in the braking system.

[0005] The above defects will cause the brake to fail, thus affecting the normal operation of the machining center. Summary of the Invention

[0006] The purpose of the present invention is to provide a hydraulic low-pressure oil type brake system for the cradle of a machining center, which can avoid or reduce the occurrence of problems such as leakage of the braking system, blockage of the brake vent hole, and brake looseness, and ensure the normal operation of the cradle of the machining center.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is: A cradle hydraulic low-pressure oil type brake system for a machining center, comprising a brake, a brake disc and a hydraulic power system. The brake disc is arranged on the main shaft of the cradle of the machining center. The brake comprises a left brake hydraulic cylinder, a left brake pad, a right brake hydraulic cylinder and a right brake pad. The left brake pad and the right brake pad are respectively located on the left and right sides of the brake disc and are respectively driven by the left brake hydraulic cylinder and the right brake hydraulic cylinder. The hydraulic power system comprises a driver, a guide rail, a rear piston rod, a rear hydraulic cylinder body, a rear hydraulic piston, a rear hydraulic oil output pipeline, a rear hydraulic oil return pipeline, a front piston rod, a front hydraulic cylinder body, a front hydraulic piston, a front hydraulic oil output pipeline and a front hydraulic oil return pipeline. The rear piston rod is located on one side of the guide rail. The rear hydraulic cylinder body is inserted on the rear piston rod. The rear hydraulic piston is fixed in the middle of the rear piston rod and is located inside the rear hydraulic cylinder body. On the rear hydraulic cylinder body and near both ends of the rear hydraulic cylinder body, there are respectively a rear oil liquid output port and a rear oil liquid input port. One end of the rear hydraulic oil output pipeline is connected to the rear oil liquid output port, and the other end is connected to the left hydraulic oil inlet on the left brake hydraulic cylinder. One end of the rear hydraulic oil return pipeline is connected to the rear oil liquid return port, and the other end is connected to the left hydraulic oil discharge port on the left brake hydraulic cylinder. The front piston rod is located on the other side of the guide rail. The front hydraulic cylinder body is inserted on the front piston rod. The front hydraulic piston is fixed in the middle of the front piston rod and is located inside the front hydraulic cylinder body. On the front hydraulic cylinder body and near both ends of the front hydraulic cylinder body, there are respectively a front oil liquid output port and a front oil liquid input port. One end of the front hydraulic oil output pipeline is connected to the front oil liquid output port, and the other end is connected to the right hydraulic oil inlet on the right brake hydraulic cylinder. One end of the front hydraulic oil return pipeline is connected to the front oil liquid return port, and the other end is connected to the right hydraulic oil discharge port on the right brake hydraulic cylinder. The driver moves along the guide rail and simultaneously drives the rear hydraulic cylinder body and the front hydraulic cylinder body to move synchronously.

[0008] Further, the brake further comprises a fixed seat. The fixed seat is provided with a left support arm and a right support arm. The left brake hydraulic cylinder and the right brake hydraulic cylinder are respectively installed on the left support arm and the right support arm.

[0009] Further, the hydraulic power system further comprises a base. The guide rail, the rear piston rod and the front piston rod are installed and fixed on the base.

[0010] Further, the driver adopts a linear motor, and the linear motor is installed on the base.

[0011] Further, the driver includes a servo motor, a power slider and a lead screw. The lead screw is fixedly installed on the base. The transmission threaded hole of the power slider is inserted on the lead screw and is adapted to the thread on the surface of the lead screw. The power slider is arranged on the guide rail and can slide along the guide rail. The output shaft of the servo motor is connected to one end of the lead screw through a coupling. The power slider is fixedly connected to the rear hydraulic cylinder body through a rear side connecting piece, and the power slider is fixedly connected to the front hydraulic cylinder body through a front side connecting piece.

[0012] Further, the hydraulic power system further includes a protective cover, which is fixedly installed on the base and covers the driver, the guide rail, the rear piston rod, the rear hydraulic cylinder body, the front piston rod and the front hydraulic cylinder body.

[0013] Further, the hydraulic power system further includes a controller and a grating ruler. The grating ruler is fixed on the base. The grating ruler transmits the displacement information of the power slider to the controller, and the controller controls the servo motor.

[0014] Further, the hydraulic oil in the hydraulic power system is of castor oil-alcohol type, synthetic type or mineral oil type.

[0015] The beneficial effects of the present invention are as follows: There is no spring in the braking system of the present application. The driver drives the rear hydraulic cylinder body and the front hydraulic cylinder body to move at the same time, generating a thrust on one side of the piston in the left and right braking hydraulic cylinders of the brake and a pulling force on the other side of the piston, so as to drive the left and right brake pads to perform braking operations with a smaller oil pressure. Compared with the prior art, due to the smaller oil pressure, the phenomenon of oil leakage is greatly reduced; since there is no vent hole on the brake, there is no problem of vent hole blockage; the present application is driven by a motor, and the friction force of the left and right brake pads is precisely regulated by the displacement amount of the drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the following drawings: Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 a schematic structural diagram of the shown hydraulic power system; Figure 3 is Figure 2 a schematic structural diagram of the shown structure after removing the protective cover.

[0017] In the figure: 1. Main shaft; 2. Brake disc; 3. Left brake hydraulic cylinder; 4. Left brake pad; 5. Right brake hydraulic cylinder; 6. Right brake pad; 7. Fixed seat; 8. Left support arm; 9. Right support arm; 10. Hydraulic power system; 11. Base; 12. Guide rail; 13. Rear piston rod; 14. Rear hydraulic cylinder body; 15. Rear hydraulic piston; 16. Rear hydraulic oil output pipeline; 17. Rear hydraulic oil return pipeline; 18. Front piston rod; 19. Front hydraulic cylinder body; 20. Front hydraulic piston; 21. Front hydraulic oil output pipeline; 22. Front hydraulic oil return pipeline; 23. Servo motor; 24. Power slider; 25. Lead screw; 26. Coupling; 27. Rear connecting piece; 28. Front connecting piece; 29. Rear oil fluid input port; 30. Left hydraulic oil inlet; 31. Left hydraulic oil discharge port; 32. Front oil fluid output port; 33. Front oil fluid input port; 34. Right hydraulic oil inlet; 35. Right hydraulic oil discharge port; 36. Controller; 37. Grating scale; 38. Protective cover; 39. Rear oil fluid output port. Detailed implementation mode

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper surface", "lower surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward rotation", "reverse rotation", "axial direction", "radial direction", "circumferential direction", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0020] Such as Figure 1 、 2As shown in Figures 3, a hydraulic low-pressure oil type brake system for a machining center cradle includes a brake, a brake disc 2, and a hydraulic power system 10. The brake disc 2 is provided on the main shaft 1 of the machining center cradle. The brake includes a left brake hydraulic cylinder 3, a left brake pad 4, a right brake hydraulic cylinder 5, and a right brake pad 6. The brake further includes a fixed seat 7. The fixed seat 7 is provided with a left support arm 8 and a right support arm 9. The left brake hydraulic cylinder 3 and the right brake hydraulic cylinder 5 are respectively installed on the left support arm 8 and the right support arm 9. The left brake pad 4 and the right brake pad 6 are respectively located on the left and right sides of the brake disc 2 and are respectively driven by the left brake hydraulic cylinder 3 and the right brake hydraulic cylinder 6. The hydraulic power system 10 provides power to the left brake hydraulic cylinder 3 and the right brake hydraulic cylinder 6.

[0021] The hydraulic power system 10 includes a base 11, a driver, a guide rail 12, a rear piston rod 13, a rear hydraulic cylinder block 14, a rear hydraulic piston 15, a rear hydraulic oil output pipeline 16, a rear hydraulic oil return pipeline 17, a front piston rod 18, a front hydraulic cylinder block 19, a front hydraulic piston 20, a front hydraulic oil output pipeline 21 and a front hydraulic oil return pipeline 22. The driver includes a servo motor 23, a power slider 24 and a lead screw 25. The lead screw 25 is installed and fixed on the base 11. The transmission threaded hole of the power slider 24 is inserted on the lead screw 25 and is adapted to the thread on the surface of the lead screw 25. The power slider 24 is arranged on the guide rail 12 and can slide along the guide rail 12. The output shaft of the servo motor 23 is connected to one end of the lead screw 25 through a coupling 26. The power slider 24 is fixedly connected to the rear hydraulic cylinder block 14 through a rear connecting member 27. The power slider 24 is fixedly connected to the front hydraulic cylinder block 19 through a front connecting member 28. The guide rail 12, the rear piston rod 13 and the front piston rod 18 are installed and fixed on the base 11. And the rear piston rod 13 is located on one side of the guide rail 12. The rear hydraulic cylinder block 14 is inserted on the rear piston rod 13. The rear hydraulic piston 15 is fixed in the middle of the rear piston rod 13 and is located inside the rear hydraulic cylinder block 14. The rear hydraulic cylinder block 14 is provided with a rear oil output port 39 and a rear oil input port 29 respectively near both ends of the rear hydraulic cylinder block 14. One end of the rear hydraulic oil output pipeline 16 is connected to the rear oil output port 39, and the other end is connected to the left hydraulic oil inlet 30 on the left brake hydraulic cylinder 3. One end of the rear hydraulic oil return pipeline 17 is connected to the rear oil return port 29, and the other end is connected to the left hydraulic oil discharge port 31 on the left brake hydraulic cylinder 3. The front piston rod 18 is located on the other side of the guide rail 12. The front hydraulic cylinder block 19 is inserted on the front piston rod 18. The front hydraulic piston 20 is fixed in the middle of the front piston rod 18 and is located inside the front hydraulic cylinder block 19. The front hydraulic cylinder block 19 is provided with a front oil output port 32 and a front oil input port 33 respectively near both ends of the front hydraulic cylinder block 19. One end of the front hydraulic oil output pipeline 21 is connected to the front oil output port 32, and the other end is connected to the right hydraulic oil inlet 34 on the right brake hydraulic cylinder 5. One end of the front hydraulic oil return pipeline 22 is connected to the front oil return port 33, and the other end is connected to the right hydraulic oil discharge port 35 on the right brake hydraulic cylinder 5. The power slider 24 moves along the guide rail 12 and simultaneously drives the rear hydraulic cylinder block 14 and the front hydraulic cylinder block 19 to move synchronously.

[0022] The hydraulic power system further includes a controller 36 and a grating scale 37. The grating scale 37 is fixed on the base 11. The grating scale 37 transmits the displacement information of the power slider 24 to the controller 36, and the controller 36 controls the servo motor 23.

[0023] The hydraulic power system further includes a protective cover 38, which is fixedly installed on the base 11 and covers the driver, the guide rail 12, the rear piston rod 13, the rear hydraulic cylinder block 14, the front piston rod 18 and the front hydraulic cylinder block 19.

[0024] The hydraulic oil in the hydraulic power system is of castor oil-alcohol type, synthetic type or mineral oil type.

[0025] Working principle: When the servo motor 23 rotates forward, it drives the power slider 24 to move. The driving power slider 24 drives the rear hydraulic cylinder block 14 and the front hydraulic cylinder block 19 to move to the left. Since the rear piston rod 13, the rear hydraulic piston 15, the front piston rod 18 and the front hydraulic piston 20 are fixed, during the movement of the rear hydraulic cylinder block 14 and the front hydraulic cylinder block 19, under the thrust of the rear hydraulic piston 15 and the front hydraulic piston 20, the hydraulic oil in the rear hydraulic cylinder block 14 and the front hydraulic cylinder block 19 respectively enters the left brake hydraulic cylinder 3 and the right brake hydraulic cylinder 5 through the rear hydraulic oil output pipeline 16 and the front hydraulic oil output pipeline 21. The left brake hydraulic cylinder 3 and the right brake hydraulic cylinder 5 respectively push the left brake pad 4 and the right brake pad 6 quickly towards the brake disc 2, so as to achieve the purpose of braking. During the process of the pistons in the left brake hydraulic cylinder 3 and the right brake hydraulic cylinder 5 moving forward, the hydraulic oil on the other side of the pistons in the left brake hydraulic cylinder 3 and the right brake hydraulic cylinder 5 flows back to the rear hydraulic cylinder block 14 and the front hydraulic cylinder block 19. Therefore, the oil pressure of the hydraulic oil in the rear hydraulic cylinder block 14, the front hydraulic cylinder block 19, the left brake hydraulic cylinder 3 and the right brake hydraulic cylinder 5 is relatively small, and it is not easy to leak. When it is necessary to release the braking operation, the servo motor 23 rotates in the reverse direction. Therefore, there is no spring in the brake in this application.

[0026] In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic low-pressure oil brake system for a machining center cradle, comprising a brake, a brake disc and a hydraulic power system, wherein the brake disc is arranged on the main shaft of the machining center cradle, and is characterized in that: The brake comprises a left brake hydraulic cylinder, a left brake pad, a right brake hydraulic cylinder and a right brake pad, wherein the left brake pad and the right brake pad are respectively located on the left and right sides of the brake disc and are driven by the left brake hydraulic cylinder and the right brake hydraulic cylinder respectively; the hydraulic power system comprises a driver, a guide rail, a rear piston rod, a rear hydraulic cylinder body, a rear hydraulic piston, a rear hydraulic oil output pipeline, a rear hydraulic oil return pipeline, a front piston rod, a front hydraulic cylinder body, a front hydraulic piston, a front hydraulic oil output pipeline and a front hydraulic oil return pipeline, wherein the rear piston rod is located on one side of the guide rail, the rear hydraulic cylinder body is inserted on the rear piston rod, the rear hydraulic piston is fixed in the middle part of the rear piston rod and is located in the rear hydraulic cylinder body, a rear oil output port and a rear oil input port are respectively provided on the rear hydraulic cylinder body and at both ends close to the rear hydraulic cylinder body, one end of the rear hydraulic oil output pipeline is connected to the rear oil output port, The other end is connected to the left hydraulic oil inlet on the left brake hydraulic cylinder, one end of the rear hydraulic oil return pipeline is connected to the rear oil return port, and the other end is connected to the left hydraulic oil discharge port on the left brake hydraulic cylinder; the front piston rod is located on the other side of the guide rail, and the front hydraulic cylinder body is inserted on the front piston rod, the front hydraulic piston is fixed in the middle of the front piston rod and is located in the front hydraulic cylinder body, and the front oil output port and the front oil input port are respectively provided on the front hydraulic cylinder body and close to the two ends of the front hydraulic cylinder body, one end of the front hydraulic oil output pipeline is connected to the front oil output port, and the other end is connected to the right hydraulic oil inlet on the right brake hydraulic cylinder, one end of the front hydraulic oil return pipeline is connected to the front oil return port, and the other end is connected to the right hydraulic oil discharge port on the right brake hydraulic cylinder; the driver moves along the guide rail and simultaneously drives the rear hydraulic cylinder body and the front hydraulic cylinder body to move synchronously.

2. The hydraulic low-pressure oil brake system for the machining center cradle according to claim 1 is characterized in that: The brake also includes a fixing seat, on which a left support arm and a right support arm are arranged, and the left brake hydraulic cylinder and the right brake hydraulic cylinder are respectively mounted on the left support arm and the right support arm.

3. The hydraulic low-pressure oil brake system for the machining center cradle according to claim 2 is characterized in that: The hydraulic power system also includes a base, and the guide rail, the rear piston rod and the front piston rod are installed and fixed on the base.

4. The hydraulic low-pressure oil brake system for the machining center cradle according to claim 3 is characterized in that: The driver adopts a linear motor, and the linear motor is installed on the base.

5. The hydraulic low-pressure oil brake system for the machining center cradle according to claim 3 is characterized by: The driver includes a servo motor, a power slider and a screw rod, the screw rod is installed and fixed on the base, the transmission threaded hole of the power slider is inserted into the screw rod and matched with the thread on the surface of the screw rod, the power slider is arranged on the guide rail and can slide along the guide rail, the output shaft of the servo motor is connected to one end of the screw rod through a coupling, the power slider is fixedly connected to the rear hydraulic cylinder body through a rear connecting piece, and the power slider is fixedly connected to the front hydraulic cylinder body through a front connecting piece.

6. The hydraulic low-pressure oil brake system for the machining center cradle according to claim 5 is characterized in that: The hydraulic power system also includes a protective cover, which is fixedly mounted on the base and covers the driver, the guide rail, the rear piston rod, the rear hydraulic cylinder body, the front piston rod and the front hydraulic cylinder body.

7. The hydraulic low-pressure oil brake system for the machining center cradle according to claim 6 is characterized in that: The hydraulic power system also includes a controller and an optical ruler, wherein the optical ruler is fixed on the base, and the optical ruler transmits the displacement information of the power slider to the controller, and the controller controls the servo motor.

8. The hydraulic low-pressure oil brake system for the machining center cradle according to claim 7 is characterized in that: The hydraulic oil in the hydraulic power system is castor oil-alcohol type, synthetic type or mineral oil type.

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