A cradle mechanism for a five-axis machine tool

Abstract

The present application relates to the technical field of machine tool processing, and discloses a cradle mechanism for a five-axis machine tool, which is installed on a five-axis machine tool and comprises a frame body, a connecting assembly and a limiting assembly, the frame body is connected to the five-axis machine tool through the connecting assembly, and the limiting assembly is used for limiting the connecting assembly on the frame body; the connecting assembly and the limiting assembly are arranged, so that the connecting strength of the frame body and the second driving mechanism is improved, and the rigidity of the five-axis machine tool is indirectly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool processing, in particular to a cradle mechanism for a five-axis machine tool. BACKGROUND

[0002] The five-axis cradle mechanism is part of a five-axis linkage numerical control machine tool. The five-axis linkage numerical control machine tool is a machine tool with high scientific and technological content and high precision, which is specially used for processing complex curved surfaces. This machine tool system has a significant influence on the aviation, aerospace, military, scientific research, precision instruments, high-precision medical equipment and other industries of a country. The five-axis linkage numerical control machine tool system is a means for processing impellers, blades, marine propellers, heavy generator rotors, turbine rotors, large diesel engine crankshafts and the like. It is a kind of numerical control rotary table and belongs to a commonly used component of machine tool processing. A workpiece is fixed on a five-axis table surface of the fifth axis of the cradle mechanism. The combination of rotation and swing of the five-axis table surface meets the processing requirements.

[0003] A vertical five-axis linkage machine tool is disclosed in the patent with publication number CN111390579B and publication date September 1, 2020, which relates to the technical field of numerical control machine tools, and comprises a machine tool bed, a base, an X-axis moving assembly, a Y-axis moving assembly, a Z-axis moving assembly, and a cradle-type worktable. The base is fixedly installed on the machine tool bed. The X-axis moving assembly comprises an X-axis sliding table arranged above the base, an X-axis driving device arranged between the X-axis sliding table and the base for driving the X-axis sliding table to freely reciprocate along the X-axis direction, and an X-axis sliding rail arranged above the base. The X-axis sliding table is in sliding connection with the X-axis sliding rail. The Y-axis moving assembly comprises a Y-axis sliding table arranged above the X-axis sliding table, a Y-axis driving device arranged between the Y-axis sliding table and the X-axis sliding table for driving the Y-axis sliding table to freely reciprocate along the Y-axis direction, and a Y-axis sliding rail arranged above the X-axis sliding table. The Y-axis sliding table is in sliding connection with the Y-axis sliding rail. The Z-axis moving assembly comprises a Z-axis sliding table arranged on the side of the Y-axis sliding table, a Z-axis driving device arranged between the Z-axis sliding table and the Y-axis sliding table for driving the Z-axis sliding table to freely reciprocate along the Z-axis direction, and a Z-axis sliding rail arranged on the side of the Y-axis sliding table. The Z-axis sliding table is in sliding connection with the Z-axis sliding rail. The cradle-type worktable is arranged above the machine tool bed and below the Z-axis sliding table. The X-axis sliding rail, the Y-axis sliding rail, and the Z-axis sliding rail are each provided with a buffer anti-collision assembly at both ends. The buffer anti-collision assembly comprises a cylinder, a piston, a push rod, a first spring, and a sealing ring. The cylinder is provided with a first chamber with one open end and one closed end, and a second chamber with both ends closed and arranged in a circular ring shape outside the first chamber. A plurality of first through holes are arranged on the side wall of the first chamber and communicate with the first chamber and the second chamber. The hole diameters of the plurality of first through holes gradually increase from the bottom of the first chamber to the opening direction of the first chamber. The piston is in sliding sealing connection with the inner side wall of the first chamber. One end of the push rod is fixedly connected with the piston, and the other end of the push rod is located outside the first chamber. One end of the first spring is fixedly connected with the end of the second chamber away from the first through hole, and the other end of the first spring is fixedly connected with the sealing ring. The sealing ring is in sliding sealing connection with the inner side wall of the second chamber. The side wall of the second chamber in contact with one end of the first spring is provided with a second through hole.

[0004] In the prior art, the cradle base and the bed are connected by bolts, which makes the rigidity of the machine tool weak, leading to a decrease in machining precision and affecting the normal machining of workpieces. SUMMARY

[0005] The purpose of the present application is to provide a cradle mechanism for a five-axis machine tool to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a cradle mechanism for a five-axis machine tool, which is installed on the five-axis machine tool and comprises a frame body, a connecting assembly and a limiting assembly, the frame body is connected to the five-axis machine tool through the connecting assembly, and the limiting assembly is used for limiting the connecting assembly on the frame body.

[0007] Preferably, the connecting assembly comprises a first flange plate and a second flange plate, the first flange plate and the second flange plate are connected through a first bolt, and the frame body is connected to the five-axis machine tool through the first flange plate and the second flange plate.

[0008] Preferably, the limiting assembly comprises a limiting disc, the limiting disc is installed on a side of the second flange plate close to the frame body, and the limiting disc is connected to the second flange plate through a second bolt.

[0009] Preferably, a limiting groove is formed in a side of the limiting disc close to the second flange plate, and the limiting groove and the first bolt form a limiting abutting fit.

[0010] Preferably, the frame body comprises a first supporting block and a second supporting block, the second supporting block is slidingly connected to the first supporting block, and a buffer assembly is arranged between the first supporting block and the second supporting block, and the buffer assembly is used for relieving the sliding speed of the second supporting block on the first supporting block.

[0011] Preferably, the buffer assembly comprises a spring, an upper end of the spring is connected to the second supporting block, and a lower end of the spring is connected to the second supporting block.

[0012] Preferably, a gas cylinder is formed in the first supporting block.

[0013] Preferably, a brake ring is fixedly installed on the second supporting block, the brake ring is sleeved on an outer wall of a five-axis table surface, a brake assembly is installed in the brake ring, and the brake assembly can brake the five-axis table surface when the five-axis table surface rotates.

[0014] Preferably, the brake assembly comprises a hydraulic cavity, an oil injection port and a brake piece, the hydraulic cavity and the oil injection port are both formed in the brake ring, one end of the oil injection port is communicated with the hydraulic cavity, and the brake piece is fixedly installed in the hydraulic cavity.

[0015] Preferably, an adjusting assembly is further installed in the second supporting block, and the adjusting assembly can adjust the size of the hydraulic cavity according to the weight of the workpiece itself.

[0016] The present application has the beneficial effect that in the above technical scheme, the connecting assembly and the limiting assembly are arranged, which can improve the connection strength of the frame body and the second driving mechanism, i.e., indirectly improve the rigidity of the five-axis machine tool. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings.

[0018] Figure 1 The structural schematic diagram provided for the embodiments of the present application;

[0019] Figure 2 The front view provided for the embodiments of the present application;

[0020] Figure 3 The front view provided for the embodiments of the present application;

[0021] Figure 4 The Figure 3 enlarged view of A in the

[0022] Figure 5 The Figure 3 enlarged view of B in the

[0023] Explanation of reference signs:

[0024] 1, cradle mechanism; 11, connecting assembly; 111, first flange plate; 112, second flange plate; 113, first bolt; 114, limiting disc; 115, second bolt; 116, limiting groove; 12, frame body; 121, first support block; 122, sliding groove; 123, second support block; 124, sliding block; 125, hole; 126, five-axis table top; 13, buffer assembly; 131, spring; 14, air cylinder; 15, brake ring; 16, brake assembly; 161, hydraulic cavity; 1611, movable cavity; 1612, annular cavity; 162, oil inlet; 163, brake pad; 17, adjustment assembly; 171, first sleeve; 172, inner shaft; 173, worm; 174, worm gear; 175, second sleeve; 176, screw rod; 177, piston plate; 2, milling head mechanism; 3, first driving mechanism; 4, second driving mechanism; 5, third driving mechanism. DETAILED DESCRIPTION

[0025] In order to make those skilled in the art better understand the technical solutions of the present application, the following will further introduce the present application in detail with reference to the drawings.

[0026] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation and be operated, and therefore cannot be understood as a limitation on the present application. In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] As Figures 1-5 shown, the embodiment of the present application provides a cradle mechanism for five-axis machine tool, which is installed on the five-axis machine tool and includes a frame body 12, a connecting assembly 11 and a limiting assembly. The frame body 12 is connected to the five-axis machine tool through the connecting assembly 11, and the limiting assembly is used to limit the connecting assembly 11 on the frame body 12.

[0028] Specifically, the five-axis machine tool comprises a cradle mechanism 1, a milling head mechanism 2, three first driving mechanisms 3 and a second driving mechanism 4. The milling head mechanism 2 is a milling head above the cradle mechanism 1 and can rotate. The three first driving mechanisms 3 are connected with the milling head mechanism 2 and used to drive the milling head mechanism 2 to adjust the position along the x, y and z axes. The first driving mechanism 3 can be a linear driving mechanism such as an electric push rod or a hydraulic cylinder. In this embodiment, the three first driving mechanisms 3 are all screw assemblies driven by motors, which are prior art and will not be described here. The cradle mechanism 1 has an approximate V-shaped structure. In the initial state, i.e. when the workpiece has not been placed on the five-axis table, the V-shaped cradle mechanism 1 has an opening facing upward. The second driving mechanism 4 is connected with the cradle mechanism 1, i.e. the cradle mechanism 1 is connected with the body of the five-axis machine tool through the second driving mechanism 4. The second driving mechanism 4 drives the cradle mechanism 1 to swing with the x axis as the center. The first supporting block 121 is connected with the second driving mechanism 4. The first supporting block 121 has two groups and is located on the two sides of the second supporting block 123. The third driving mechanism 5 is arranged on the second supporting block 123 and connected with the five-axis table. The third driving mechanism 5 is used to drive the five-axis table to rotate on the second supporting block 123. The second driving mechanism 4 and the third driving mechanism 5 can be rotary driving mechanisms such as motors or rotary air cylinders 14, which are prior art and will not be described here. In actual use, the workpiece is placed on the five-axis table. The cradle mechanism 1 is in the initial state, i.e. the V-shaped cradle mechanism 1 is in the state of the opening facing upward. The five-axis table can fix the workpiece by vacuum adsorption or set a chuck or other fixture on the five-axis table to fix the workpiece. The vacuum adsorption and the fixture are prior art and will not be described here. The connection between the frame 12 and the second driving mechanism 4 can be improved by the connection assembly 11 and the limiting assembly, which indirectly improves the rigidity of the five-axis machine tool.

[0029] In optional embodiments, preferably, the connection assembly 11 comprises a first flange plate 111 and a second flange plate 112. The first flange plate 111 and the second flange plate 112 are connected through the first bolt 113. The frame 12 is connected with the five-axis machine tool through the first flange plate 111 and the second flange plate 112.

[0030] Specifically, a plurality of screw holes are arranged on the first flange plate 111 and the second flange plate 112. The first bolt 113 is screwed with the first flange plate 111 and the second flange plate 112 through the screw holes. The two ends of the frame 12 are fixedly installed on the second driving mechanism 4 through the first flange plate 111 and the second flange plate 112. The connection between the frame 12 and the second driving mechanism 4 can be improved by the first flange plate 111 and the second flange plate 112, which indirectly improves the rigidity of the five-axis machine tool.

[0031] In an optional embodiment, preferably, the limiting component comprises a limiting disc 114, which is installed on the second flange disc 112 close to the side of the frame body 12, and is connected to the second flange disc 112 through a second bolt 115.

[0032] Specifically, the limiting disc 114 is provided with a limiting groove 116 on the side close to the second flange disc 112, and the limiting groove 116 is in limiting abutting fit with the first bolt 113. In actual use, when the first bolt 113 passes through the first flange disc 111 and the second flange disc 112, the frame body 12 is fixed on the five-axis machine tool, at this time, the limiting disc 114 is attached to the second flange disc 112, so that the nut in the first bolt 113 enters the limiting groove 116, and the first bolt 113 is limited and extruded by the limiting groove 116. When the limiting disc 114 is installed on the second flange disc 112 through the second bolt 115, the second bolt 115 is not affected by the relative displacement or shaking of the connection between the first flange disc 111 and the second flange disc 112, because the second bolt 115 is not affected, so the limiting disc 114 can stably limit the first bolt 113 on the second flange disc 112, avoiding the loosening and disengagement of the first bolt 113, and indirectly improving the connection strength of the first flange disc 111 and the second flange disc 112.

[0033] In another embodiment of the present application, further, the frame body 12 comprises a first supporting block 121 and a second supporting block 123, the second supporting block 123 is slidingly connected to the first supporting block 121, and a buffer component 13 is arranged between the first supporting block 121 and the second supporting block 123, which is used to relieve the sliding speed of the second supporting block 123 on the first supporting block 121.

[0034] Specifically, when the frame body 12 is in the initial state, i.e. the workpiece to be processed has not been placed on the five-axis table 126, the frame body 12 is in a V-shaped structure with the opening upward, the five-axis table 126 is rotatably installed on the second supporting block 123, the first supporting block 121 is provided with a sliding groove 122 on the side close to the first supporting block 121, and the second supporting block 123 is provided with a sliding block 124 on the side close to the first supporting block 121, the sliding block 124 is located in the sliding groove 122 and is in sliding guide fit with the sliding groove 122, and the groove direction of the sliding groove 122 is consistent with the axial direction of the five-axis table 126.

[0035] Further, the buffer assembly 13 comprises a spring 131, the upper end of the spring 131 is connected with the second supporting block 123, the lower end of the spring 131 is connected with the second supporting block 123, the second supporting block 123 is approximately in the shape of a cross, when the workpiece is placed on the five-axis table top 126, the second supporting block 123 starts to descend under the gravity of the workpiece, the sliding block 124 descends in the sliding groove 122, the spring 131 gradually contracts under the gravity, the impact force generated when the second supporting block 123 descends is relieved through the contraction of the spring 131 itself, the impact force is avoided to be transmitted to the first supporting block 121, so as to reduce the influence on the second driving mechanism 4.

[0036] Secondly, the inside of the first supporting block 121 is provided with a pneumatic cylinder 14, the pneumatic cylinder 14 is arranged vertically, when in the initial state, the pneumatic cylinder 14 is in the contracted state, the telescopic shaft of the output end of the pneumatic cylinder 14 does not contact the second supporting block 123, and the sliding block 124 is located at the top of the sliding groove 122, when the workpiece is placed on the five-axis table top 126, the second supporting block 123 has descended on the first supporting block 121, the pneumatic cylinder 14 starts to stretch, so that the telescopic shaft of the output end of the pneumatic cylinder 14 contacts the surface of the second supporting block 123, under the pushing of the pneumatic cylinder 14, the second supporting block 123 carrying the workpiece is forced to ascend, at the same time, the sliding block 124 slides in the sliding groove 122, until the sliding block 124 is reset to ascend to the top of the sliding groove 122, at this time, the second supporting block 123 is also reset to the initial height, at the same time, the pneumatic cylinder 14 also remains in the stretched state, the sliding block 124 is limited by the pneumatic cylinder 14 in the stretched state at the top of the sliding groove 122, and the sliding block 124 cannot slide in the sliding groove 122, so as to avoid the shaking of the second supporting block 123 and the five-axis table top 126 when the cradle mechanism 1 swings.

[0037] In the above embodiment, since the five-axis table top 126 is a component for mounting the workpiece, the five-axis table top 126 will tilt with the swing of the cradle mechanism 1 during machining, the center of gravity of the workpiece mounted on the five-axis table top 126 will deviate from the axis, when the workpiece tilts, a torsional force will be generated, the third driving mechanism 5 has limited ability to resist the torsional force, when the mass of the workpiece is large and the center of gravity deviates greatly, the torsional force will be large, which will cause damage to the third driving mechanism 5, affect the service life of the third driving mechanism 5, and since the braking force received by the five-axis table top 126 is limited, the position of the workpiece will deviate during machining, which will affect the machining precision, therefore, in another embodiment of the present application, further, the second supporting block 123 is fixedly provided with a brake ring 15, the brake ring 15 is sleeved on the outer wall of the five-axis table top 126, the brake assembly 16 is mounted in the brake ring 15, and the brake assembly 16 can brake the five-axis table top 126 during rotation.

[0038] Specifically, the brake ring 15 is rotationally connected to the five-axis table 126, the central axis of the brake ring 15 is collinear with the central axis of the five-axis table 126, the brake assembly 16 includes a hydraulic cavity 161, an oil inlet 162 and a brake pad 163, the hydraulic cavity 161 and the oil inlet 162 are both arranged inside the brake ring 15, one end of the oil inlet 162 is communicated with the hydraulic cavity 161, and the brake pad 163 is fixedly installed inside the hydraulic cavity 161,

[0039] The other end of the oil inlet 162 is connected with an external hydraulic oil pump, the hydraulic cavity 161 has an opening arranged on the inner side of the brake ring 15, the brake pad 163 is installed at the opening of the hydraulic cavity 161 and seals the opening, so that the hydraulic cavity 161 is a sealed cavity, in actual use, the external hydraulic oil pump injects a certain amount of hydraulic oil into the hydraulic cavity 161, at this time, the pressure in the hydraulic cavity 161 begins to rise, the pressure rise will make the brake pad 163 deform inward and tightly hold the peripheral surface of the five-axis table 126, and the brake pad 163 realizes the brake of the five-axis table 126 through the friction contact between the brake pad 163 after deformation and the five-axis table 126, and similarly, when the five-axis table 126 needs to rotate, the external hydraulic oil pump can extract the hydraulic oil from the inside of the hydraulic cavity 161, at this time, the pressure in the hydraulic cavity 161 decreases, the brake pad 163 resets, and the five-axis table 126 can freely rotate after losing the tight holding of the brake pad 163, through the setting of the brake pad 163, the brake of the five-axis table 126 can be realized without the participation of the third driving mechanism 5, and the position deviation of the workpiece is avoided.

[0040] In the above embodiment, it is disclosed that when the workpiece is inclined, a torsional force is generated, and the greater the weight of the workpiece, the greater the torsional resistance load of the second driving mechanism 4, and the greater the difficulty of braking, therefore, in another embodiment of the present application, further, the second support block 123 is further provided with an adjusting assembly 17, and the adjusting assembly 17 can adjust the size of the hydraulic cavity 161 according to the weight of the workpiece itself.

[0041] Specifically, the adjusting assembly 17 cooperates with the buffering assembly 13, the adjusting assembly 17 can adjust the size of the hydraulic cavity 161 according to the descending height of the second support block 123 on the first support block 121, when the weight of the workpiece is heavier, the spring 131 is affected by the gravity and shrinks shorter, the second support block 123 is lowered by the sliding block 124 sliding in the sliding groove 122, and the adjusting assembly 17 adjusts the volume of the hydraulic cavity 161 to be smaller gradually, when the volume of the hydraulic cavity 161 is smaller, the pressure in the hydraulic cavity 161 is greater when the external hydraulic oil pump injects a certain amount of hydraulic oil into the hydraulic cavity 161, the deformation amplitude of the brake pad 163 is greater, the contact area of the brake pad 163 with the circumferential surface of the five-axis table top 126 is greater, the holding force of the brake pad 163 is greater, and the friction between the two is greater, so that the increase of the friction, the holding force and the contact area can realize the rapid braking of the five-axis table top 126 when the five-axis table top 126 bears a workpiece with a heavy weight; similarly, the smaller the space of the hydraulic cavity 161 corresponding to the lighter workpiece is, the smaller the deformation amplitude of the brake pad 163 is, through the adjustment of the hydraulic cavity 161, not only the braking of the workpiece with a heavy weight can be realized, but also the brake pad 163 can be prevented from being in a large deformation state all the time, so that the service life of the brake pad 163 is indirectly improved.

[0042] In an optional embodiment, the adjusting assembly 17 comprises a piston plate 177, which can move radially in the hydraulic cavity 161 during the descending of the second support block 123.

[0043] Specifically, the hydraulic cavity 161 comprises a movable cavity 1611 and an annular cavity 1612, the annular cavity 1612 is arranged in a ring shape, the movable cavity 1611 is arranged along the radial direction of the brake ring 15 and is provided with two groups which are symmetrically distributed along the annular cavity 1612, both groups of the movable cavities 1611 are in communication with the annular cavity 1612, the piston plate 177 is located in the movable cavity 1611 and forms a dynamic sealing connection with the movable cavity 1611, the brake pad 163 is located in the hydraulic cavity 161, the oil inlet 162 communicates with the hydraulic cavity 161, one end of the movable cavity 1611 is open and communicates with the annular cavity 1612, and the piston plate 177 is arranged at the one end opening of the movable cavity 1611 away from the annular cavity 1612, so that the movement of the piston plate 177 in the movable cavity 1611 can adjust the volume of the movable cavity 1611;

[0044] In actual use, when the cradle mechanism 1 is in the initial state, the workpiece to be processed is placed on the five-axis table top 126, and as the weight on the five-axis table top 126 increases, the second supporting block 123 slides downward in the sliding groove 122 through the sliding block 124, at this time, the piston plate 177 can move in the active cavity 1611 to different degrees according to the descending height of the second supporting block 123 on the first supporting block 121, that is, the volume of the hydraulic chamber 161 can be indirectly adjusted by the movement of the piston plate 177 in the active cavity 1611, so as to adjust the volume of the hydraulic chamber 161 according to the weight of the workpiece, so as to control the brake pad 163 to deform to different amplitudes according to the amount of hydraulic oil, and realize brake braking when the five-axis table top 126 bears workpieces of different weights.

[0045] Further, the adjusting assembly 17 further comprises a first sleeve 171, an inner shaft 172, a worm 173, a worm wheel 174, a second sleeve 175, and a screw rod 176. The first supporting block 121 is internally provided with a hole 125. The first sleeve 171 is located in the hole 125 and forms a sliding guide cooperation with the hole 125. The inner shaft 172 is located in the first sleeve 171. The first sleeve 171 is internally provided with a spiral groove. The outer wall of the inner shaft 172 is provided with a protrusion, which is located in the spiral groove and forms a sliding guide cooperation with the spiral groove. The lower end of the worm 173 is fixedly connected to the upper end of the inner shaft 172. The upper end of the worm 173 is rotatably connected to the inner wall of the brake ring 15. The worm wheel 174 is rotatably connected to the inner wall of the brake ring 15. The worm 173 is engaged with the worm wheel 174. One end of the second sleeve 175 is fixedly connected to the center of the worm wheel 174 and rotatably connected to the inner wall of the brake ring 15. The second sleeve 175 is internally hollow and the inner wall is provided with an internal thread. One end of the screw rod 176 extends into the second sleeve 175 and forms a threaded cooperation with the second sleeve 175. The other end of the screw rod 176 is fixedly connected to the piston plate 177.

[0046] Among them, the first sleeve 171 and the inner shaft 172 are both installed in the second supporting block 123. The worm 173, the worm wheel 174, and the second supporting block are all located in the brake ring 15. The upper end of the inner shaft 172 penetrates the second supporting block 123 and extends into the brake ring 15. The end extending into the brake ring 15 is connected to the worm 173. Secondly, the active cavity 1611 and the piston plate 177 are both rectangular structures, so the piston plate 177 will not rotate in the active cavity 1611. When the cradle mechanism 1 is in the initial state, the lower end of the first sleeve 171 abuts against the first supporting block 121.

[0047] In actual use, when the second support block 123 slides down on the first support block 121, the distance between the second support block 123 and the first support block 121 is constantly reduced, at this time, the first sleeve 171 constantly extends into the hole 125 in the second support block 123 under the abutment of the first support block 121, that is, the first sleeve 171 rises in the hole 125 at this time, the rising of the first sleeve 171 makes the protrusions on the outer wall of the inner shaft 172 slide in the spiral groove, under the cooperation of the spiral groove, the inner shaft 172 rotates in the first sleeve 171, the rotation of the inner shaft 172 drives the worm 173 to rotate, the rotation of the worm 173 drives the worm wheel 174 and the second sleeve 175 thereon to rotate, because the second sleeve 175 is provided with an internal thread and threadedly cooperates with the screw rod 176, and the end of the screw rod 176 away from the sleeve is fixedly connected with the piston plate 177, therefore, the rotation of the second sleeve 175 drives the screw rod 176 and the piston plate 177 to move away from the worm wheel 174, and the volume of the movable cavity 1611 is adjusted by the movement of the piston plate 177;

[0048] When the cylinder 14 drives the second support block 123 to reset and rise, because the hole 125 in the second support block 123 is also provided with a rubber ring, the rubber ring has a certain friction with the first sleeve 171, therefore, when the first sleeve 171 extends into the inside of the hole 125, it will not descend in the rising process of the second support block 123 by the friction with the rubber ring, that is, it will not reset and descend with the opening of the gap between the first support block 121 and the second support block 123, because the first sleeve 171 does not reset and descend, the inner shaft 172, the worm 173, the worm wheel 174 and the second sleeve 175 will not reset and rotate, and the piston plate 177 will not reset and move, and is in the position after horizontal adjustment, and by the self-locking between the worm wheel 174 and the worm 173, when the worm 173 is in a stationary state, the worm wheel 174 is also in a stationary state, the worm wheel 174 cannot drive the worm 173 to rotate in the reverse direction, the worm wheel 174 cannot rotate, and the piston plate 177 cannot move, therefore, when hydraulic oil is injected into the movable cavity 1611, the increase of the pressure in the movable cavity 1611 cannot force the piston plate 177 to reset and move in the movable cavity 1611, thereby realizing the locking of the position adjustment of the piston plate 177;

[0049] Furthermore, when processing various workpieces, the weights of different workpieces vary. Since the piston plate 177 has already been adjusted when the first workpiece is placed, the worm gear 174 and worm 173 will not drive the piston plate 177 to reset. Therefore, in this embodiment, the volume adjustment of the movable cavity 1611 is irreversible. That is, the volume of the movable cavity 1611 can only be adjusted to decrease, not to increase, because the weights of different workpieces vary when processing various workpieces. When the piston plate 177 has already been adjusted when the first workpiece is placed, the worm gear 174 and worm 173 will not drive the piston plate 177 to reset. When placing a second workpiece, if its weight is greater than the first, the descent of the second support block 123 will increase. The lower end of the first sleeve rod will then contact the first support block 121 again, forcing it to extend further into the hole 125. This will again rotate the inner shaft 172, worm gear 173, and worm wheel 174, causing the piston plate 177 to move within the movable cavity 1611, specifically, the piston plate 177 will move closer to the annular cavity 1612. As the volume of the active cavity 1611 continues to decrease, conversely, when the weight of the second workpiece is less than the weight of the first workpiece, the lower end of the first sleeve 171 will not contact the first support block 121, and the first sleeve 171 will not continue to extend into the hole 125. The inner shaft 172, worm gear 173, and worm wheel 174 will not rotate, and the piston plate 177 will not continue to move. In this embodiment, the greater the weight of the workpiece, the greater the torsional load on the third drive mechanism 5, and the greater the deformation amplitude of the brake pad 163. The greater the clamping force of the circumference of the five-axis table 126, the larger the contact area, and the greater the wear between the brake pad 163 and the five-axis table 126. If the deformation amplitude of the brake pad 163 is reduced at this time, the wear caused by the large deformation of the brake pad 163 may cause it to be unable to firmly clamp the circumference of the five-axis table 126 when the deformation is small. Therefore, by adjusting the volume of the movable cavity 1611 irreversibly, it is avoided that when a lighter workpiece is placed on the five-axis table 126, the five-axis table 126 will not be effectively braked.

[0050] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A cradle mechanism for a five-axis machine tool, which is installed on a five-axis machine tool, characterized by, The utility model relates to a five-axis machine tool connecting frame, which comprises a frame body, a connecting assembly and a limiting assembly, the frame body is connected with the five-axis machine tool through the connecting assembly, the limiting assembly is used for limiting the connecting assembly on the frame body, the frame body comprises a first supporting block and a second supporting block, the second supporting block is slidingly connected with the first supporting block, a buffer assembly is arranged between the first supporting block and the second supporting block, the buffer assembly is used for relieving the sliding speed of the second supporting block on the first supporting block, a brake ring is fixedly installed on the second supporting block, the brake ring is sleeved on the outer wall of the five-axis table surface, a brake assembly is installed in the brake ring, the brake assembly can brake the five-axis table surface when the five-axis table surface rotates, the brake assembly comprises a hydraulic cavity, an oil inlet and a brake piece, the hydraulic cavity and the oil inlet are both arranged in the brake ring, one end of the oil inlet is communicated with the hydraulic cavity, the brake piece is fixedly installed in the hydraulic cavity, an adjusting assembly is further installed in the second supporting block, and the adjusting assembly can adjust the size of the hydraulic cavity according to the weight of the workpiece.

2. A cradle mechanism for a five-axis machine tool according to claim 1, characterized in that The connecting assembly comprises a first flange plate and a second flange plate, the first flange plate and the second flange plate are connected through first bolts, and the frame body is connected with the five-axis machine tool through the first flange plate and the second flange plate.

3. A cradle mechanism for a five-axis machine tool according to claim 2, characterized in that The limiting assembly comprises a limiting disc, the limiting disc is installed on the side of the second flange plate close to the frame body, and the limiting disc is connected with the second flange plate through second bolts.

4. A cradle mechanism for a five-axis machine tool according to claim 3, characterized in that The side of the limiting disc close to the second flange plate is provided with a limiting groove, and the limiting groove and the first bolt form a limiting abutting fit.

5. A cradle mechanism for a five-axis machine tool according to claim 1, characterized in that, The buffer assembly comprises a spring, the upper end of the spring is connected with the second supporting block, and the lower end of the spring is connected with the second supporting block.

6. A cradle mechanism for a five-axis machine tool according to claim 1, characterized in that, The first supporting block is internally provided with an air cylinder.

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