Anti-falling locking mechanism for Z-axis brake of machine tool

Abstract

The invention relates to the technical field of numerical control machine tools, in particular to a machine tool Z-axis brake anti-falling locking mechanism which comprises a saddle, a transmission mechanism is arranged at the top of the saddle, a limiting mechanism is arranged on one side of the transmission mechanism, the transmission mechanism comprises a mounting seat arranged at the top of the saddle, a servo motor is arranged at one end of the mounting seat, and a transmission shaft is arranged at the other end of the mounting seat. The limiting mechanism comprises a rotating shaft rotationally arranged at the top of the saddle and a circular ring in threaded connection with the top of the transmission shaft, the top of the rotating shaft is connected with a limiting piece, one end of the limiting piece is provided with a convex corner, the other end of the limiting piece is provided with a roller, and the roller is attached to the outer side of the synchronous belt a. The rotating shaft is sleeved with a torsion spring, convex teeth are arranged on the outer ring of the circular ring, the servo motor drives the transmission shaft and the lead screw to rotate through a synchronous belt a to achieve movement of the Z axis, and after the synchronous belt a is broken, the torsion spring drives the rotating shaft to rotate to lock the transmission shaft through abutting of convex corners and the convex teeth.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, and in particular to a machine tool Z-axis brake anti-drop locking mechanism. Background Art

[0002] In CNC machine tools, the Z axis is an important coordinate axis, which is the direction of the spindle axis. In vertical or horizontal CNC machine tool processing centers, the movement direction of the Z axis is determined by the spindle that transmits the cutting power. The Z axis is used to control the movement of the tool in the direction perpendicular to the plane of the worktable, and is used to adjust the feed depth of the tool, affecting the tool positioning, processing depth, processing accuracy and other aspects of the spindle. The Z axis of CNC machine tools in the prior art is usually driven by a linear motor. Due to the influence of its own gravity, on the one hand, the downward gravity of the Z axis will cause a certain pulling force on the motor, affecting the service life of the motor; on the other hand, when the motor suddenly loses power, the Z axis will continue to slide down a certain distance due to inertia and cannot be locked in time under the influence of gravity, which will not only damage the processing tools, but also damage the spindle and processing tools.

[0003] A Chinese utility model patent with the announcement number CN211681165U discloses a Z-axis counterweight mechanism for a numerically controlled machine tool, comprising a Z-axis module, a carrier plate located on one side of the Z-axis module, and a counterweight cylinder located on the Z-axis module; the Z-axis module is driven by a linear motor, the Z-axis module comprises a motion block and a spindle located in the motion block, the counterweight cylinder is located in the motion block, and the counterweight cylinder is connected to the carrier plate through a bracket. The utility model can perform counterweight operation on the Z-axis module of the numerically controlled machine tool under the cooperation of the Z-axis module, the carrier plate and the counterweight cylinder. When the linear motor drives the Z-axis module to rise, the pulling force of the counterweight cylinder is upward, and the gravity of the Z-axis module itself can be balanced by adjusting the pulling force of the counterweight cylinder to keep it in a high-speed and high-response state. When the linear motor suddenly loses power, the counterweight cylinder can brake the Z-axis module to prevent the Z-axis module from sliding down and protect the spindle.

[0004] The counterweight cylinder in the mechanism converts the internal spring force into friction force for braking to lock the piston rod of the counterweight cylinder to achieve the braking function. However, it cannot guarantee that the counterweight cylinder can lock the Z axis in time to prevent the Z axis from sliding down. The Z axis still has the risk of sliding down too much, causing damage to the spindle, tool and workpiece. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and provide a machine tool Z-axis brake anti-drop locking mechanism, comprising a saddle, a transmission mechanism is arranged on the top of the saddle, a limiting mechanism is arranged on one side of the transmission mechanism, the transmission mechanism comprises a mounting seat fixedly arranged on the top of the saddle, a servo motor is fixedly arranged at one end of the mounting seat, a transmission shaft is rotatably arranged at the other end of the mounting seat, a lead screw is fixedly arranged at the bottom of the transmission shaft, a synchronous belt a is arranged between the servo motor and the transmission shaft, the limiting mechanism comprises a rotating shaft rotatably arranged on the top of the saddle and a circular ring threadedly connected to the top of the transmission shaft, a limiting member is fixedly connected to the top of the rotating shaft, a convex angle is arranged at one end of the limiting member, a roller is rotatably arranged at the other end of the limiting member, the roller is fitted with the outer side of the synchronous belt a, a torsion spring is also sleeved on the rotating shaft, and a convex tooth is arranged on the outer ring of the circular ring, so as to solve the problem of the prior art that the Z-axis cannot be locked in time when the power is off, resulting in damage to the spindle, the tool and the workpiece.

[0006] The technical solutions of the present invention are as follows: A machine tool Z-axis brake anti-drop locking mechanism comprises a saddle, a transmission mechanism is arranged on the top of the saddle, a limiting mechanism is arranged on one side of the transmission mechanism, the transmission mechanism comprises a mounting seat fixedly arranged on the top of the saddle, a servo motor is fixedly arranged on one end of the mounting seat, a transmission shaft is rotatably arranged on the other end of the mounting seat, a lead screw is fixedly arranged on the bottom of the transmission shaft, a synchronous belt a is arranged between the servo motor and the transmission shaft, the limiting mechanism comprises a rotating shaft rotatably arranged on the top of the saddle and a circular ring threadedly connected to the top of the transmission shaft, a limiting member is fixedly connected to the top of the rotating shaft, a convex angle is arranged on one end of the limiting member, a roller is rotatably arranged on the other end of the limiting member, the roller is fitted with the outer side of the synchronous belt a, a torsion spring is also sleeved on the rotating shaft, and a convex tooth is arranged on the outer ring of the circular ring, the servo motor drives the transmission shaft and the lead screw to rotate counterclockwise through the synchronous belt a to realize the up and down movement of the Z axis, and after the synchronous belt a breaks, the torsion spring drives the rotating shaft to rotate clockwise through the convex angle and the convex tooth to lock the transmission shaft.

[0007] As a preference, the front end of the servo motor is fixedly connected to an output shaft, the other end of the output shaft is fixedly connected to a synchronous pulley a, the top of the transmission shaft is fixedly connected to a synchronous pulley b, and the synchronous pulley a is connected to the synchronous pulley b through a synchronous belt a.

[0008] As a preferred embodiment, a rotating seat a is provided below the transmission shaft, the transmission shaft is rotatably set on the rotating seat a, the rotating seat a is threadedly connected to the top of the saddle, a rotating seat b is provided at the bottom of the rotating shaft, the limiting member is rotatably set on the rotating seat b, the rotating seat b is threadedly connected to the top of the saddle, and the two ends of the torsion spring are respectively provided on the limiting member and the rotating seat b.

[0009] As a preference, a lubrication mechanism is arranged above the limiting mechanism, and the lubrication mechanism includes a bracket fixedly arranged on the top of the mounting seat, an oil storage cylinder is fixedly connected to the bracket, an oil outlet pipe connected to the oil storage cylinder is fixedly connected to the bottom of the oil storage cylinder, a connecting rod is also fixedly connected to the top of the oil storage cylinder, and a slide groove is fixedly connected to the top of the connecting rod.

[0010] As a preferred embodiment, a baffle is slidably arranged in the slide groove, the top surface of the baffle is in contact with the bottom surface of the oil outlet pipe, a through hole that can be connected to the oil outlet pipe is opened on the baffle, an arc-shaped protrusion is fixedly connected to the front end of the baffle, rectangular blocks are fixedly connected on both sides of the rear end of the baffle, a return spring is fixedly connected to the rectangular block, and the other end of the return spring is fixedly connected to the slide groove.

[0011] As a preferred embodiment, the lubrication mechanism also includes a fixed rod fixedly arranged on the top of the ring and a rotating rod rotatably arranged on the top of the mounting seat, the top of the fixed rod is fixedly connected to a synchronous pulley c, the top of the rotating rod is fixedly connected to a synchronous pulley d, the synchronous pulley c and the synchronous pulley d are connected by a synchronous belt b, and a cam is fixedly connected to the rotating rod.

[0012] As a preference, a screw nut is provided on the screw rod.

[0013] As another preferred embodiment, a slide rail is provided on one side of the saddle, and a pull rod is obliquely provided on the back side of the saddle.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention is provided with a transmission mechanism, in which a synchronous pulley a in the transmission mechanism is connected to a synchronous pulley b arranged on the top of the transmission shaft through a synchronous belt a, and the transmission shaft and a lead screw arranged at the bottom of the transmission shaft can be driven to rotate by a servo motor, and the up and down movement of the Z axis is realized by the lead screw. This transmission method can not only adjust the movement of the Z axis in time through the servo motor, but also avoid the sudden power failure causing the Z axis to continue to slide down under the action of gravity, causing damage to the spindle, the tool and the workpiece, and can also avoid the downward gravity of the Z axis causing a certain pulling force on the motor, thereby affecting the service life of the motor.

[0015] 2. The present invention provides a limiting mechanism, in which a rotating shaft is rotatably arranged on a rotating seat b, a torsion spring is sleeved on the rotating shaft, a limiting member is arranged on the top of the rotating shaft, convex angles and rollers are respectively arranged at both ends of the limiting member, and the rollers are fitted with the outer side of the synchronous belt a. When the synchronous belt a breaks after long-term use, the rotating shaft can rotate clockwise driven by the torsion spring, and the convex angle and the convex teeth arranged on the outer ring of the circular ring threadedly connected to the top of the transmission shaft are abutted against each other to lock the transmission shaft in time, so as to avoid the problem that when the synchronous belt a breaks, the transmission shaft cannot be locked in time and continues to rotate under the action of inertia, resulting in the Z-axis sliding down and causing damage to the spindle, the tool and the workpiece.

[0016] 3. The present invention is provided with a lubrication mechanism, in which a fixed rod is fixedly arranged on the top of the circular ring, a synchronous pulley c is fixedly connected to the top of the fixed rod, and the synchronous pulley c is connected to the synchronous pulley d fixedly connected to the top of the rotating rod through a synchronous belt b, so that the servo motor drives the synchronous pulley a and the synchronous pulley b to rotate, and at the same time, the synchronous pulley c can drive the synchronous pulley d to rotate, so that the cam fixedly connected on the rotating rod rotates counterclockwise synchronously with the rotating rod, and the cam pushes the baffle plate at intervals during the rotation process to move the baffle plate backward. After the backward movement, the through hole opened on the baffle plate is connected with the oil outlet pipe at the bottom of the oil storage cylinder, so that a small amount of lubricating oil in the oil storage cylinder can drip between the synchronous belt a and the roller through the oil outlet pipe and the through hole, thereby lubricating the synchronous belt a and the roller, greatly reducing the wear of the synchronous belt a caused by the long-term contact between the synchronous belt a and the roller during operation, extending the service life of the synchronous belt a, ensuring the processing efficiency to a certain extent, and also reducing the maintenance cost of the equipment.

[0017] To sum up, the present invention has the advantages of being able to lock the Z-axis in time to prevent the Z-axis from sliding down and causing damage to the spindle, tool and workpiece, extending the service life of the equipment, having good synchronization effect and ingenious structure, and is suitable for the field of CNC machine tool technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 This is a structural diagram of the Z-axis brake anti-drop locking mechanism of the machine tool; Figure 2 It is a schematic diagram of the position structure of the lead screw, lead screw nut and guide rail; Figure 3 for Figure 2 A magnified schematic diagram of point A; Figure 4 It is a partial structural diagram of the limiting mechanism; Figure 5 This is a schematic diagram of the state when the synchronous belt a is not broken and the limiter does not lock the transmission shaft; Figure 6 This is a schematic diagram of the state in which the limiter locks the transmission shaft after the synchronous belt a breaks; Figure 7 It is a schematic diagram of the state in which the cam pushes the baffle plate during the rotation process so that the lubricating oil in the oil storage cylinder lubricates the roller and the synchronous belt a; Figure 8 for Figure 7 An enlarged schematic diagram of point B.

[0019] In the figure: saddle 1, transmission mechanism 2, limiting mechanism 3, lubrication mechanism 4, slide rail 11, pull rod 12, mounting seat 21, servo motor 22, transmission shaft 23, screw 24, synchronous belt a25, output shaft 26, synchronous pulley a27, synchronous pulley b28, rotating seat a29, screw nut 210, rotating shaft 31, ring 32, limiting member 33, convex angle 34, roller 35, torsion spring 36, convex tooth 37, rotating seat b38, bracket 41, oil storage cylinder 42, oil outlet pipe 43, connecting rod 44, slide groove 45, baffle 46, through hole 47, arc convex block 48, rectangular block 49, reset spring 410, fixed rod 411, rotating rod 412, synchronous pulley c413, synchronous pulley d414, synchronous belt b415, cam 416. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.

[0021] Embodiment 1

[0022] like Figures 1 to 8As shown, a Z-axis brake anti-drop locking mechanism for a machine tool comprises a saddle 1, a transmission mechanism 2 is arranged on the top of the saddle 1, a limiting mechanism 3 is arranged on one side of the transmission mechanism 2, the transmission mechanism 2 comprises a mounting seat 21 fixedly arranged on the top of the saddle 1, a servo motor 22 is fixedly arranged on one end of the mounting seat 21, a transmission shaft 23 is rotatably arranged on the other end of the mounting seat 21, a lead screw 24 is fixedly arranged on the bottom of the transmission shaft 23, a synchronous belt a25 is arranged between the servo motor 22 and the transmission shaft 23, and the limiting mechanism 3 comprises a rotating shaft 31 rotatably arranged on the top of the saddle 1 and a servo motor 22 is threadedly connected to the top of the transmission shaft 23. The circular ring 32 at the top of the rotating shaft 31 is fixedly connected to a limiting member 33, one end of the limiting member 33 is provided with a convex angle 34, and the other end of the limiting member 33 is rotatably provided with a roller 35, and the roller 35 is in contact with the outer side of the synchronous belt a25. A torsion spring 36 is also sleeved on the rotating shaft 31, and a convex tooth 37 is provided on the outer ring of the circular ring 32. The servo motor 22 drives the transmission shaft 23 and the lead screw 24 to rotate counterclockwise through the synchronous belt a25 to realize the up and down movement of the Z axis. After the synchronous belt a25 breaks, the torsion spring 36 drives the rotating shaft 31 to rotate clockwise, and the convex angle 34 abuts against the convex tooth 37 to lock the transmission shaft 23. The rotating shaft 31 in the limiting mechanism 2 is rotatably set on the rotating seat b38, and a torsion spring 36 is sleeved on the rotating shaft 31. A limiting member 33 is set on the top of the rotating shaft 31. A convex angle 34 and a roller 35 are respectively set at both ends of the limiting member 33. The roller 35 fits with the outer side of the synchronous belt a25. When the synchronous belt a25 breaks after long-term use, the rotating shaft 31 can rotate clockwise under the drive of the torsion spring 36, and the convex angle 34 and the convex teeth 37 set on the outer ring 32 threadedly connected to the top of the transmission shaft 23 are abutted to lock the transmission shaft 23 in time, so as to avoid the problem that when the synchronous belt a25 breaks, the transmission shaft 23 cannot be locked in time and continues to rotate under the action of inertia, resulting in the Z axis sliding down and causing damage to the spindle, tool and workpiece.

[0023] like Figure 3 , Figure 5 and Figure 6As shown, the front end of the servo motor 22 is fixedly connected with an output shaft 26, the other end of the output shaft 26 is fixedly connected with a synchronous pulley a27, the top of the transmission shaft 23 is fixedly connected with a synchronous pulley b28, and the synchronous pulley a27 is connected to the synchronous pulley b28 through a synchronous belt a25. The servo motor 22 drives the synchronous pulley a27 to rotate through the output shaft 26 fixedly connected at the front end, and the synchronous pulley a27 is connected to the synchronous pulley b28 set at the top of the transmission shaft 23 through a synchronous belt a25. The servo motor 22 can drive the transmission shaft 23 and the screw rod 24 set at the bottom of the transmission shaft 23 to rotate, and the Z axis is moved up and down through the screw rod 24. This transmission mode can not only adjust the movement of the Z axis in time through the servo motor 22, but also avoid the sudden power failure that causes the Z axis to continue to slide down under the action of gravity, causing damage to the spindle, tool and workpiece, and can also avoid the downward gravity of the Z axis causing a certain pulling force on the motor, affecting the service life of the motor.

[0024] like Figure 3 , Figure 5 and Figure 6 As shown, a rotating seat a29 is arranged below the transmission shaft 23, the transmission shaft 23 is rotatably arranged on the rotating seat a29, the rotating seat a29 is threadedly connected to the top of the saddle 1, a rotating seat b38 is arranged at the bottom of the rotating shaft 31, the limit member 33 is rotatably arranged on the rotating seat b38, the rotating seat b38 is threadedly connected to the top of the saddle 1, and the two ends of the torsion spring 36 are respectively arranged on the limit member 33 and the rotating seat b38. By setting the torsion spring 36, after the synchronous belt a25 breaks, since the roller 35 loses the obstruction of the synchronous belt a25, the torsion spring 36 can drive the rotating shaft 31 to rotate clockwise by a certain angle. After the rotation, the convex corner 34 at one end of the limiting member 33 at the top of the rotating shaft 31 contacts and abuts against the convex tooth 37 set on the outer ring 32 threadedly connected to the top of the transmission shaft 23, thereby limiting and locking the transmission shaft 23 and the screw rod 24 to prevent the Z axis from continuing to slide down; after the synchronous belt a25 breaks, the transmission shaft 23 and the ring 32 can be locked by rotating half a circle at most, which can avoid damage to the spindle, tool and workpiece to the greatest extent.

[0025] like Figure 1 , Figure 3 , Figure 4 , Figure 7 and Figure 8As shown, a lubricating mechanism 4 is arranged above the limiting mechanism 3, and the lubricating mechanism 4 includes a bracket 41 fixedly arranged on the top of the mounting seat 21, an oil storage cylinder 42 is fixedly connected to the bracket 41, an oil outlet pipe 43 connected to the oil storage cylinder 42 is fixedly connected to the bottom of the oil storage cylinder 42, and a connecting rod 44 is also fixedly connected to the top of the oil storage cylinder 42, and a slide groove 45 is fixedly connected to the top of the connecting rod 44. Lubricating oil is stored in the oil storage cylinder 42, and the caliber of the oil outlet pipe 43 matches the through hole 47 opened on the baffle 46. When the baffle 46 moves backward under the push of the cam 416 to connect the through hole 47 with the oil outlet pipe 43, the lubricating oil in the oil storage cylinder 42 drips through the oil outlet pipe 43 and the through hole 47 to the roller 35 below and the synchronous belt a25 to play a lubricating role; the baffle 46 is installed through the slide groove 45 to support the baffle 46.

[0026] like Figure 3 and Figure 8 As shown, a baffle 46 is slidably arranged in the slide groove 45, the top surface of the baffle 46 is in contact with the bottom surface of the oil outlet pipe 43, a through hole 47 which can be connected with the oil outlet pipe 43 is opened on the baffle 46, an arc-shaped protrusion 48 is fixedly connected to the front end of the baffle 46, rectangular blocks 49 are fixedly connected on both sides of the rear end of the baffle 46, a return spring 410 is fixedly connected to the rectangular block 49, and the other end of the return spring 410 is fixedly connected to the slide groove 45. The through hole 47 is provided at the front of the baffle 46, and the baffle 46 is slidably arranged in the slide groove 45. When the cam 416 rotates counterclockwise, it contacts the arc-shaped protrusion 48 at the front end of the baffle 46 to push the baffle 46 backward, so that the baffle 46 moves backward along the slide groove 45. When the baffle 46 moves to the bottom, the through hole 47 is completely connected with the oil outlet pipe 43. When the cam 416 does not contact the arc-shaped protrusion 48, the baffle 46 moves forward and resets under the drive of the reset spring 410. After the baffle 46 is reset, the through hole 47 is staggered with the oil outlet pipe 23, and the top surface of the baffle 46 fits with the oil outlet pipe 23 to close the oil outlet pipe 23.

[0027] like Figure 3 , Figure 7 and Figure 8As shown, the lubrication mechanism 4 also includes a fixed rod 411 fixedly arranged on the top of the ring 32 and a rotating rod 412 rotatably arranged on the top of the mounting seat 21, the top of the fixed rod 411 is fixedly connected to a synchronous pulley c413, the top of the rotating rod 412 is fixedly connected to a synchronous pulley d414, the synchronous pulley c413 and the synchronous pulley d414 are connected by a synchronous belt b415, and a cam 416 is fixedly connected to the rotating rod 412. The fixed rod 411 in the lubricating mechanism 4 is fixedly arranged on the top of the ring 32, and a synchronous pulley c413 is fixedly connected to the top of the fixed rod 411. The synchronous pulley c413 is connected to the synchronous pulley d414 fixedly connected to the top of the rotating rod 412 through a synchronous belt b415, so that the servo motor 22 drives the synchronous pulley a27 and the synchronous pulley b28 to rotate, and the synchronous pulley c413 can drive the synchronous pulley d414 to rotate, so that the cam 416 fixedly connected to the rotating rod 412 rotates counterclockwise synchronously with the rotating rod 412, and the cam 416 is spaced apart during the rotation process. The baffle plate 46 is pushed to move backward. After the backward movement, the through hole 47 opened on the baffle plate 46 is connected with the oil outlet pipe 43 at the bottom of the oil storage cylinder 42, so that a small amount of lubricating oil in the oil storage cylinder 42 can drip between the synchronous belt a27 and the roller 35 through the oil outlet pipe 43 and the through hole 47, which lubricates the synchronous belt a27 and the roller 35, greatly reduces the wear of the synchronous belt a27 caused by the long-term contact between the synchronous belt a27 and the roller 35 during operation, prolongs the service life of the synchronous belt a27, ensures the processing efficiency to a certain extent, and also reduces the maintenance cost of the equipment.

[0028] like Figure 2 As shown, a screw nut 210 is provided on the screw 24. The synchronous pulley a27 provided on the top of the servo motor 22 is connected to the synchronous pulley b28 provided on the top of the transmission shaft 23 through the synchronous belt a25. The servo motor 22 drives the transmission shaft 23 and the screw 24 provided at the bottom of the transmission shaft 23 to rotate, and the up and down movement of the Z axis is realized through the screw 24. The movement of the Z axis can be adjusted in time through the servo motor 22.

[0029] like Figure 2 As shown, a slide rail 11 is provided on one side of the saddle 1. The slide rail 11 can make the up and down movement of the Z axis smoother.

[0030] Embodiment 2

[0031] like Figure 1 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The difference between the second embodiment and the first embodiment is that a pull rod 12 is obliquely provided on the back of the saddle 1. The provision of the pull rod 12 makes the saddle 1 stronger, and can exert oblique pulling force on the Z axis and the main axis, thereby improving the stability of the Z axis and the main axis.

[0032] The working process is as follows: When the equipment is running, the servo motor 22 drives the synchronous pulley a27 to rotate counterclockwise through the output shaft 26 fixedly connected at the front end, and the synchronous pulley a27 drives the synchronous pulley b28 set on the top of the transmission shaft 23 to rotate synchronously through the synchronous belt a25, thereby driving the screw rod 24 at the bottom of the transmission shaft 23 to rotate, and the up and down movement of the Z axis is realized through the screw rod 24; the servo motor 22 drives the synchronous pulley a27 and the synchronous pulley b28 to rotate, and the synchronous pulley c413 can drive the synchronous pulley d414 to rotate, so that the cam 416 fixedly connected to the rotating rod 412 rotates counterclockwise synchronously with the rotating rod 412, and the cam 416 pushes the baffle 46 at intervals during the rotation process to make the baffle 46 move backward. After moving backward, The through hole 47 formed on the baffle plate 46 is connected to the oil outlet pipe 43 at the bottom of the oil storage cylinder 42, so that a small amount of lubricating oil in the oil storage cylinder 42 can drip between the synchronous belt a27 and the roller 35 through the oil outlet pipe 43 and the through hole 47, thereby lubricating the synchronous belt a27 and the roller 35; when the synchronous belt a25 breaks, since the roller 35 loses the obstruction of the synchronous belt a25, the torsion spring 36 can drive the rotating shaft 31 to rotate clockwise by a certain angle. After the rotation, the convex corner 34 at one end of the limit member 33 at the top of the rotating shaft 31 contacts and abuts against the convex tooth 37 arranged on the outer ring of the ring 32 threadedly connected to the top of the transmission shaft 23, thereby limiting and locking the transmission shaft 23 and the screw rod 24 to prevent the Z axis from continuing to slide down.

[0033] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0034] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0035] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A machine tool Z-axis brake anti-drop locking mechanism, comprising a saddle (1), characterized in that: A transmission mechanism (2) is arranged on the top of the saddle (1); a limiting mechanism (3) is arranged on one side of the transmission mechanism (2); the transmission mechanism (2) comprises a mounting seat (21) fixedly arranged on the top of the saddle (1); a servo motor (22) is fixedly arranged on one end of the mounting seat (21); a transmission shaft (23) is rotatably arranged on the other end of the mounting seat (21); a screw rod (24) is fixedly arranged on the bottom of the transmission shaft (23); a synchronous belt a (25) is arranged between the servo motor (22) and the transmission shaft (23); the limiting mechanism (3) comprises a rotating shaft (31) rotatably arranged on the top of the saddle (1) and a circular ring (32) threadedly connected to the top of the transmission shaft (23); the rotating shaft ( A limiting member (33) is fixedly connected to the top of the synchronous belt a (31), one end of the limiting member (33) is provided with a convex angle (34), and the other end of the limiting member (33) is rotatably provided with a roller (35), and the roller (35) is in contact with the outer side of the synchronous belt a (25). A torsion spring (36) is also sleeved on the rotating shaft (31), and a convex tooth (37) is provided on the outer ring of the circular ring (32). The servo motor (22) drives the transmission shaft (23) and the lead screw (24) to rotate counterclockwise through the synchronous belt a (25) to achieve the up and down movement of the Z axis. After the synchronous belt a (25) breaks, the torsion spring (36) drives the rotating shaft (31) to rotate clockwise, and the convex angle (34) and the convex tooth (37) abut against each other to lock the transmission shaft (23).

2. The machine tool Z-axis brake anti-drop locking mechanism according to claim 1, characterized in that: The front end of the servo motor (22) is fixedly connected to an output shaft (26), the other end of the output shaft (26) is fixedly connected to a synchronous pulley a (27), the top of the transmission shaft (23) is fixedly connected to a synchronous pulley b (28), and the synchronous pulley a (27) is connected to the synchronous pulley b (28) via a synchronous belt a (25).

3. The machine tool Z-axis brake anti-drop locking mechanism according to claim 2, characterized in that: A rotating seat a (29) is arranged below the transmission shaft (23), the transmission shaft (23) is rotatably arranged on the rotating seat a (29), the rotating seat a (29) is threadedly connected to the top of the saddle (1), a rotating seat b (38) is arranged at the bottom of the rotating shaft (31), the limiting member (33) is rotatably arranged on the rotating seat b (38), the rotating seat b (38) is threadedly connected to the top of the saddle (1), and two ends of the torsion spring (36) are respectively arranged on the limiting member (33) and the rotating seat b (38).

4. The machine tool Z-axis brake anti-drop locking mechanism according to claim 3, characterized in that: A lubricating mechanism (4) is arranged above the limiting mechanism (3), and the lubricating mechanism (4) comprises a bracket (41) fixedly arranged on the top of the mounting seat (21), an oil storage cylinder (42) is fixedly connected to the bracket (41), an oil outlet pipe (43) in communication with the oil storage cylinder (42) is fixedly connected to the bottom of the oil storage cylinder (42), a connecting rod (44) is also fixedly connected to the top of the oil storage cylinder (42), and a slide groove (45) is fixedly connected to the top of the connecting rod (44).

5. The machine tool Z-axis brake anti-drop locking mechanism according to claim 4, characterized in that: A baffle (46) is slidably arranged in the slide groove (45), the top surface of the baffle (46) is in contact with the bottom surface of the oil outlet pipe (43), a through hole (47) which can be connected to the oil outlet pipe (43) is opened on the baffle (46), an arc-shaped protrusion (48) is fixedly connected to the front end of the baffle (46), and rectangular blocks (49) are fixedly connected to both sides of the rear end of the baffle (46), a return spring (410) is fixedly connected to the rectangular block (49), and the other end of the return spring (410) is fixedly connected to the slide groove (45).

6. The machine tool Z-axis brake anti-drop locking mechanism according to claim 5, characterized in that The lubrication mechanism (4) further comprises a fixed rod (411) fixedly arranged on the top of the circular ring (32) and a rotating rod (412) rotatably arranged on the top of the mounting seat (21); a synchronous pulley c (413) is fixedly connected to the top of the fixed rod (411); a synchronous pulley d (414) is fixedly connected to the top of the rotating rod (412); the synchronous pulley c (413) and the synchronous pulley d (414) are connected via a synchronous belt b (415); and a cam (416) is fixedly connected to the rotating rod (412).

7. The machine tool Z-axis brake anti-drop locking mechanism according to claim 6, characterized in that: A screw nut (210) is provided on the screw rod (24).

8. The machine tool Z-axis brake anti-drop locking mechanism according to claim 7, characterized in that: A slide rail (11) is provided on one side of the saddle (1), and a pull rod (12) is obliquely provided on the back side of the saddle (1).

Images