Split type cradle mechanism for five-axis machine tool

Abstract

The invention relates to the technical field of machine tool machining, and discloses a split type cradle mechanism for a five-axis machine tool, the split type cradle mechanism is rotatably connected to the five-axis machine tool and comprises a first connecting block, a second connecting block and a five-axis table top, the second connecting block is slidably connected to the first connecting block, a buffer assembly is installed in the first connecting block, and the five-axis table top is installed on the second connecting block; when a workpiece is placed on the five-axis table top, the second connecting block slides on the first connecting block under the influence of gravity, and the buffering assembly is used for buffering the second connecting block when the second connecting block descends. In the using process of the buffering assembly, the second connecting block slides and descends on the first connecting block after being influenced by the gravity of a workpiece, impact force generated by collision between the workpiece and the five-axis table top is relieved through the buffering assembly in the descending process, and meanwhile the impact force is prevented from being transmitted to the first connecting block and the second driving mechanism; and the condition that the cradle mechanism and the second driving mechanism are damaged is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool processing, in particular to a split cradle mechanism for a five-axis machine tool. Background Art

[0002] The five-axis cradle mechanism is part of the five-axis linkage CNC machine tool. The five-axis linkage CNC machine tool is a machine tool with high technological content, high precision, and is specially used for processing complex surfaces. This machine tool system has a significant influence on a country's aviation, aerospace, military, scientific research, precision instruments, high-precision medical equipment and other industries. The five-axis linkage CNC machine tool system is a means to solve the processing of impellers, blades, marine propellers, heavy generator rotors, turbine rotors, large diesel engine crankshafts, etc. It is a kind of CNC turntable and a common component of machine tool processing. The workpiece is fixed on the five-axis table of the fifth axis of the cradle mechanism, and the processing requirements are met through the combination of rotation and swing of the five-axis table.

[0003] For example, a patent with publication number CN115008214B and publication date December 1, 2023 discloses a brake mechanism for a five-axis table in a five-axis cradle turntable, which relates to the field of mechanical technology. It includes a fourth axis and a disc tailstock, and a five-axis assembly is fixed between the four-axis table of the fourth axis and the tailstock table of the disc tailstock. The five-axis assembly includes a bridge plate, a motor and a five-axis table. The motor is installed on the lower side of the bridge plate, and the five-axis table is connected to the output shaft of the motor and is located on the upper side of the bridge plate. It is characterized in that the five-axis The brake mechanism of the table is arranged on the bridge plate, and comprises a fixed ring and a brake ring. The fixed ring is sleeved on the outer side of the five-axis table and fixed to the bridge plate, and the brake ring is located between the five-axis table and the fixed ring. The brake ring is provided with a deformable annular brake part, and a pressure chamber is provided between the outer side of the annular brake part and the fixed ring. A hydraulic oil circuit connected with the pressure chamber is provided in the fixed ring and the bridge plate, and the hydraulic oil circuit is connected with an oil pump. When the pressure in the pressure chamber increases, the annular brake part is deformed inward and hugs the peripheral surface of the five-axis table.

[0004] Before the machine tool is processed, the workpiece needs to be placed on the five-axis table. In the existing technology, the placement of the workpiece is mostly achieved manually or by a robotic arm. When the workpiece is heavy, it is difficult to slowly place the workpiece on the five-axis table. When the workpiece is placed, it will collide with the five-axis table to a certain extent, causing the five-axis table, that is, the machine tool as a whole, to vibrate. If things go on like this for a long time, it will not only cause damage to the five-axis table, but also cause damage to the fourth axis at the connection between the five-axis table and the machine tool, thereby affecting the swing and rotation of the cradle mechanism. Summary of the invention

[0005] The object of the present invention is to provide a split 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-mentioned purpose, the present invention provides the following technical solutions: a split cradle mechanism for a five-axis machine tool, which is rotatably connected to the five-axis machine tool, and includes a first connecting block, a second connecting block and a five-axis table. The second connecting block is slidably connected to the first connecting block, and a buffer assembly is installed inside the first connecting block. The five-axis table is installed on the second connecting block. When the workpiece is placed on the five-axis table, the second connecting block slides on the first connecting block under the influence of gravity, and the buffer assembly is used to buffer the second connecting block when it descends.

[0007] Preferably, the five-axis machine tool includes a bed body, the bed body includes two groups of vertically arranged support plates and a base, the cradle mechanism is installed between the two groups of support plates, and the bottom of the support plate is connected to the base.

[0008] Preferably, the cradle mechanism is mounted on the support plate via a flange.

[0009] Preferably, the buffer assembly includes a spring, a sliding groove is provided on a side of the first connecting block close to the second connecting block, a sliding block is provided on the corresponding side of the second connecting block, the sliding block is located inside the sliding groove and forms a sliding guide with the sliding groove, the spring is installed inside the sliding groove, one end of the spring is connected to the groove wall of the sliding groove, and the other end is connected to the sliding block.

[0010] Preferably, a cylinder is fixedly installed inside the first connecting block, and a telescopic shaft at the output end of the cylinder extends into the interior of the slide groove.

[0011] Preferably, a limit ring is fixedly installed on the second connecting block, the limit ring is sleeved on the outer wall of the five-axis table and is rotatably connected to the limit ring, and a hydraulic brake assembly is installed inside the limit ring, and the hydraulic brake assembly is used to realize braking of the five-axis table.

[0012] Preferably, the hydraulic brake assembly includes a pressure chamber and a brake ring. The pressure chamber is opened inside the limit ring. The brake ring is arranged on the inner wall of the limit ring and is located between the limit ring and the five-axis table. An oil circuit is also opened inside the limit ring. One end of the oil circuit is connected to the pressure chamber, and the other end is connected to an external oil pump.

[0013] Preferably, an adjusting component is also installed in the second connecting block, and the adjusting component can adjust the size of the pressure chamber according to the weight of the workpiece.

[0014] Preferably, the adjusting assembly includes a transmission member and a piston plate. A chamber is provided in the pressure chamber. The piston plate is installed inside the chamber and forms a dynamic sealing connection with the chamber. The transmission member is installed inside the second connecting block. The transmission member is used to drive the piston plate to move horizontally in the chamber when the second connecting block descends.

[0015] Preferably, the pressure chamber consists of a cavity and an oil pressure chamber, the cavity is connected to the oil pressure chamber, two groups of chambers are arranged and symmetrically distributed along the oil pressure chamber, the brake ring is located inside the oil pressure chamber, and one end of the oil circuit is connected to the oil pressure chamber.

[0016] The beneficial effect of the present invention is that in the above technical scheme, during the use of the buffer assembly of the present invention, the second connecting block slides down on the first connecting block after being affected by the gravity of the workpiece itself, and during the descent, the buffer assembly alleviates the impact force generated by the collision between the workpiece and the five-axis table, while also preventing the impact force from being transmitted to the first connecting block and the second driving mechanism, thereby reducing damage to the cradle mechanism and the second driving mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the structure provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a front view structure provided by an embodiment of the present invention;

[0020] Figure 3 A schematic cross-sectional structural diagram of a cradle mechanism provided in an embodiment of the present invention;

[0021] Figure 4 The embodiment of the present invention provides Figure 3 A in the enlarged view;

[0022] Figure 5 The embodiment of the present invention provides Figure 4 Enlarged view of point B in .

[0023] Description of reference numerals:

[0024] 1. cradle mechanism; 11. first connecting block; 111. slideway; 12. second connecting block; 121. slider; 13. five-axis table; 14. limit ring; 15. buffer assembly; 151. spring; 152. cylinder; 16. hydraulic brake assembly; 161. pressure chamber; 1611. chamber; 1612. oil pressure chamber; 162. oil circuit; 163. piston plate; 1631. rotating part; 164. brake ring; 165. Two screw rods; 166, bracket; 167, second sleeve; 17, adjustment assembly; 171, gear; 172, rack; 173, first transmission shaft; 174, second transmission shaft; 175, first sleeve; 176, first screw rod; 177, telescopic section; 178, friction ring; 2, milling head mechanism; 3, first drive mechanism; 4, second drive mechanism; 5, third drive mechanism; 6, bed; 61, support plate; 62, base. DETAILED DESCRIPTION

[0025] 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.

[0026] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1-5 As shown, an embodiment of the present invention provides a split cradle mechanism for a five-axis machine tool, which is rotatably connected to the five-axis machine tool, and includes a first connecting block 11, a second connecting block 12 and a five-axis table 13. The second connecting block 12 is slidably connected to the first connecting block 11, and a buffer assembly 15 is installed inside the first connecting block 11. The five-axis table 13 is installed on the second connecting block 12. When a workpiece is placed on the five-axis table 13, the second connecting block 12 slides on the first connecting block 11 under the influence of gravity, and the buffer assembly 15 is used to buffer the second connecting block 12 when it descends.

[0028] Specifically, the five-axis machine tool includes a cradle mechanism 1, a milling head mechanism 2, a first drive mechanism 3 and a second drive mechanism 4. The milling head mechanism 2 is a milling head that is above the cradle mechanism 1 and can rotate. The first drive mechanism 3 is provided with three groups. The three groups of first drive mechanisms 3 are connected to the milling head mechanism 2 and are used to drive the milling head mechanism 2 to adjust the position along the x, y, and z axes. The first drive mechanism 3 can be a linear drive mechanism such as an electric push rod and a hydraulic cylinder. In this embodiment, the three groups of first drive mechanisms 3 are all screw assemblies driven by a motor. This is a prior art and will not be repeated.

[0029] like Figure 1 and Figure 2 As shown, the cradle mechanism 1 is approximately V-shaped, and the second driving mechanism 4 is connected to the cradle mechanism 1. The second driving mechanism 4 drives the cradle mechanism 1 to swing with the x-axis as the center.

[0030] The five-axis machine tool also includes a bed 6, which is a U-shaped structure. The bed 6 is composed of two groups of vertically arranged support plates 61 and a base 62. The cradle mechanism 1 is installed between the two groups of support plates 61, and the first drive mechanism 3 and the second drive mechanism 4 are both installed on the support plate 61. The bottom of the support plate 61 is connected to the base 62. In this embodiment, the cradle mechanism 1 is installed on the support plate 61 through a flange, that is, the cradle mechanism is detachably connected to the support plate 61, wherein the installation of the flange belongs to the prior art and is not repeated. The installation position of the cradle mechanism 1 can be closer to the center of the five-axis machine tool than the traditional structural design, which can increase the working stroke of the five-axis machine tool, make the machine tool more stable, and make the structure more compact. The support plate 61 and the base 62 can be arranged as an integral whole, that is, the bottom of the support plate 61 is fixedly connected to the base 62, and the two can be integrally formed during the casting process;

[0031] Secondly, the support plate 61 and the base 62 can also be set up in a split manner, that is, the support plate 61 can be detachably connected to the base 62, such as by snap-on, plug-in, threaded connection, etc., that is, during the casting process of the support plate 61 and the base 62, if the mass of the base 62 itself is relatively large, the base 62 and the support plate 61 can be cast and processed separately during the casting process, and assembled after the separate processing to reduce the casting difficulty and cost, and through the split assembly of the support plate 61, the base 62 and the cradle mechanism 1, the precision of each component can be adjusted during the assembly process according to the different processing precisions, while if the processing precision of the integrated support plate 61, the base 62 and the cradle mechanism 1 is not good, the integrated type is difficult to adjust, and it will take a lot of time during the assembly process.

[0032] The first connecting block 11 is connected to the second driving mechanism 4. The first connecting block 11 is provided with two groups, which are respectively located on both sides of the second connecting block 12. The second connecting block 12 is provided with a third driving mechanism 4. The third driving mechanism 4 is connected to the five-axis table 13 and is used to drive the five-axis table 13 to rotate on the second connecting block 12. The second driving mechanism 4 and the third driving mechanism 4 can both be rotating driving mechanisms such as motors and rotating cylinders 152. This is the prior art and will not be described in detail. In actual use, the workpiece is placed on the five-axis table 13, and the cradle mechanism 1 is in an initial state, that is, the V-shaped cradle mechanism 1 is in an open state facing upward. The five-axis table 13 fixes the workpiece by vacuum adsorption, and a five-jaw chuck or other fixtures can be set on the five-axis table 13 to fix the workpiece. Vacuum adsorption and fixtures are both existing technologies and are not described in detail. During the workpiece placement process, the second connecting block 12 slides down on the first connecting block 11 after being affected by the gravity of the workpiece itself, and the impact force generated by the collision between the workpiece and the five-axis table 13 is alleviated by the buffer component 15 during the descent process, and the impact force is also prevented from being transmitted to the first connecting block 11 and the second driving mechanism 4, thereby reducing the damage to the cradle mechanism 1 and the second driving mechanism 4.

[0033] In an optional embodiment, preferably, the buffer assembly 15 includes a spring 151, a slide groove 111 is provided on a side of the first connecting block 11 close to the second connecting block 12, and a slider 121 is provided on the corresponding side of the second connecting block 12. The slider 121 is located inside the slide groove 111 and forms a sliding guide with the slide groove 111. The spring 151 is installed inside the slide groove 111, one end of the spring 151 is connected to the groove wall of the slide groove 111, and the other end is connected to the slider 121.

[0034] Specifically, when the cradle mechanism 1 is in the initial state, the slide groove 111 is opened vertically, the spring 151 is in a natural state, and the slider 121 is located at the top of the slide groove 111. When the workpiece is placed on the five-axis table 13, the second connecting block 12 begins to descend under the gravity of the workpiece, and the slider 121 descends in the slide groove 111. The spring 151 gradually contracts under the influence of gravity. The contraction of the spring 151 itself can alleviate the impact force generated when the second connecting block 12 descends, thereby preventing the impact force from being transmitted to the first connecting block 11, thereby reducing the impact on the second driving mechanism 4.

[0035] In the above embodiment, when the workpiece is placed on the five-axis table 13, the second connecting block 12 achieves buffering when the workpiece is placed by descending itself. Since the weights of different workpieces are different, the second connecting block 12 descends according to the weight of the workpiece. That is to say, when workpieces of different weights are placed on the workbench, the second connecting block 12 descends to different heights, resulting in the five-axis table 13 not having a fixed height position, which affects the subsequent workpiece processing. Therefore, in this embodiment, a cylinder 152 is also fixedly installed inside the first connecting block 11, and the telescopic shaft at the output end of the cylinder 152 extends into the interior of the slide groove 111.

[0036] Specifically, when the cradle mechanism 1 is in the initial state, the cylinder 152 is arranged vertically and is located below the slider 121. After the spring 151 contracts and the slider 121 descends to buffer the second connecting block 12, the telescopic shaft at the output end of the cylinder 152 begins to stretch and contacts the lower surface of the slider 121. As the telescopic shaft at the output end of the cylinder 152 continues to stretch, the slider 121 is driven by the cylinder 152 to reset and rise in the slide groove 111 until the slider 121 resets and slides to the top of the slide groove 111, and the second connecting block 12 is reset to its initial horizontal height. At the same time, the cylinder 152 is also kept in a stretched state, and the slider 121 is restricted at the top of the slide groove 111 by the stretched cylinder 152, and the slider 121 cannot slide in the slide groove 111, thereby avoiding the second connecting block 12 and the five-axis table 13 from shaking when the cradle mechanism 1 swings.

[0037] In the above embodiment, since the five-axis table 13 is a component for mounting the workpiece, the five-axis table 13 will tilt with the swing of the cradle mechanism 1 during processing. When the workpiece is mounted on the five-axis table 13, its center of gravity will deviate from the axis position. When the workpiece tilts, a torsional force will be generated, and the third drive mechanism 4 has limited anti-twisting ability. When the mass of the workpiece is large and the center of gravity is offset more, the torsional force will be very large, which will cause damage to the third drive mechanism 4 and affect the service life of the third drive mechanism 4. Since the braking force on the five-axis table 13 is limited, there is a situation where the workpiece position is offset during processing, which affects the processing accuracy. Therefore, in another embodiment of the present invention, further, a limit ring 14 is fixedly installed on the second connecting block 12, and the limit ring 14 is sleeved on the outer wall of the five-axis table 13 and rotatably connected to the limit ring 14. A hydraulic brake assembly 16 is installed inside the limit ring 14, and the hydraulic brake assembly 16 is used to realize braking of the five-axis table 13.

[0038] Specifically, the central axis of the limit ring 14 is colinear with the central axis of the five-axis table 13, and the hydraulic brake assembly 16 includes a pressure chamber 161 and a brake ring 164. The pressure chamber 161 is opened inside the limit ring 14, and the brake ring 164 is arranged on the inner wall of the limit ring 14 and is located between the limit ring 14 and the five-axis table 13. An oil circuit 162 is also opened inside the limit ring 14, and one end of the oil circuit 162 is connected to the pressure chamber 161, and the other end is connected to an external oil pump. In this embodiment, the brake ring 164 is an annular and deformable brake pad, and the external oil pump (not shown) is connected to the oil circuit 162 through a pipeline. The brake ring 164 and the oil pump are both existing technologies and will not be repeated.

[0039] In actual use, the workpiece is placed on the five-axis table 13, and the third driving mechanism 4 drives the five-axis table 13 to rotate on the second connecting block 12. At the same time, the second driving mechanism 4 drives the cradle mechanism 1 to swing, and drives the five-axis table 13 and the workpiece thereon to swing synchronously. When the five-axis table 13 needs to brake, the oil pump injects hydraulic oil into the pressure chamber 161 through the pipeline. At this time, the pressure in the pressure chamber 161 rises, and the pressure rise causes the brake ring 164 to deform inwardly and hold the peripheral surface of the five-axis table 13 tightly. The friction force between the five-axis table 13 and the five-axis table 13 is transformed to realize the braking of the five-axis table 13. Similarly, when the five-axis table 13 needs to rotate, the oil pump can extract the hydraulic oil from the pressure chamber 161. At this time, the pressure in the pressure chamber 161 drops, and the brake ring 164 is deformed and reset. The five-axis table 13 can rotate freely after losing the clamping of the brake ring 164. Through the setting of the brake ring 164, the braking of the five-axis table 13 can be achieved without the third driving mechanism 4 participating in the braking, thereby avoiding the position displacement of the workpiece.

[0040] The above-mentioned embodiment discloses that when the workpiece is tilted, a torsional force will be generated, and the greater the weight of the workpiece, the greater the anti-torsion load on the second drive mechanism 4, and the more difficult it is to brake it. Therefore, in another embodiment of the present invention, further, an adjustment component 17 is installed in the second connecting block 12, and the adjustment component 17 can adjust the size of the pressure chamber 161 according to the weight of the workpiece.

[0041] Specifically, when the cradle mechanism 1 is in the initial state, the adjusting component 17 is connected to the buffer component 15, and the adjusting component 17 can adjust the size of the pressure chamber 161 according to the descending height of the second connecting block 12 on the first connecting block 11. When the weight of the workpiece is heavier, the spring 151 shrinks shorter under the influence of gravity, and the second connecting block 12 slides and descends lower in the slide groove 111 through the slider 121. At the same time, the adjusting component 17 adjusts the volume of the pressure chamber 161 to gradually become smaller. As the volume of the pressure chamber 161 becomes smaller, when the oil pump injects a certain amount of hydraulic oil into the pressure chamber 161, the pressure in the pressure chamber 161 will be greater, and the deformation amplitude of the brake ring 164 will be greater, and the brake ring The larger the contact area between 164 and the circumference of the five-axis table 13, the greater the clamping force thereon, and the greater the friction between the two. By increasing the friction, the clamping force and the contact area, when the five-axis table 13 carries a heavy workpiece, the five-axis table 13 can be quickly braked. Similarly, the lighter the workpiece, the smaller the space of the corresponding pressure chamber 161, and the smaller the deformation amplitude of the brake ring 164. By adjusting the pressure chamber 161, not only can the braking of the heavy workpiece be achieved, but also when the brake ring 164 can achieve braking, the brake ring 164 can be prevented from being in a state of large deformation all the time, thereby indirectly increasing the service life of the brake ring 164.

[0042] In an optional embodiment, preferably, the adjusting assembly 17 includes a transmission member and a piston plate 163, a chamber 1611 is provided in the pressure chamber 161, the piston plate 163 is installed inside the chamber 1611 and forms a dynamic sealing connection with the chamber 1611, and the transmission member is installed inside the second connecting block 12, and the transmission member is used to drive the piston plate 163 to move horizontally in the chamber 1611 when the second connecting block 12 descends.

[0043] Specifically, the pressure chamber 161 is composed of a chamber 1611 and an oil pressure chamber 1612. The chamber 1611 is connected to the oil pressure chamber 1612. Two groups of chambers 1611 are provided and symmetrically distributed along the oil pressure chamber 1612. The brake ring 164 is located inside the oil pressure chamber 1612. One end of the oil circuit 162 is connected to the oil pressure chamber 1612. The transmission member includes a gear 171, a rack 172, a first transmission shaft 173 and a second transmission shaft 174. The first transmission shaft 173 is installed inside the first connecting block 11. The first transmission shaft 173 is rotatably connected to the inner wall of the first connecting block 11, and one end of the first transmission shaft 173 extends from the side of the slider 121 and extends into the slide groove 111, and the end extending into the slide groove 111 is connected to the gear 171, the rack 172 is installed in the slide groove 111, the rack 172 is meshed with the gear 171, and the second transmission shaft 174 is rotatably installed inside the limiting ring 14, the first transmission shaft 173 and the second transmission shaft 174 are connected by a transmission belt, and the second transmission shaft 174 is close to the fifth axis. One end of the table 13 is connected to a first screw 176, and a telescopic section 177 is provided between the second transmission shaft 174 and the first screw 176. A first sleeve 175 is also installed in the limiting ring 14. The first screw 176 is located in the first sleeve 175 and forms a threaded fit with the first sleeve 175. The end of the first screw 176 away from the second transmission shaft 174 is rotatably connected to the piston plate 163. In this embodiment, the chamber 1611 is a space structure of a rectangular parallelepiped structure, and the piston plate 163 is a rectangular plate. The oil pressure chamber 1612 is a circular space structure, and the telescopic section 177 is a rod body with a prismatic structure installed between the second transmission shaft 174 and the first screw 176. One end of the rod body extends into the middle of the groove body inside the second transmission shaft 174 and forms a sliding guide with the groove body. The groove body is also a prismatic structure, so the rod body does not rotate in the second transmission shaft 174. The other end of the rod body is fixedly connected to the first screw 176. This telescopic structure is a prior art and will not be described in detail.

[0044] In actual use, when the cradle mechanism 1 is in the initial state, the staff places the workpiece to be processed on the five-axis table 13. As the weight on the five-axis table 13 increases, the second connecting block 12 slides down in the slide groove 111 through the slider 121, and during the descent, the gear 171 is meshed with the rack 172, and drives the gear 171 to rotate. The rotation of the gear 171 drives the first transmission shaft 173 and the second transmission shaft 174 to rotate. During the rotation of the second transmission shaft 174, the first screw 176 rotates in the first sleeve 175 and moves closer to the piston plate during the rotation. One side of 163 moves horizontally, at this time, the telescopic section 177 starts to pull up, and the horizontal movement of the first screw 176 drives the piston plate 163 to move horizontally in the chamber 1611. Since the hydraulic oil is injected into the side of the piston plate 163 away from the first screw 176, the volume of the pressure chamber 161 can be indirectly adjusted by the movement of the piston plate 163 in the chamber 1611, that is, the volume of the pressure chamber 161 can be adjusted according to the weight of the workpiece, so that the brake ring 164 is controlled to deform to different degrees according to the quantitative hydraulic oil, so as to realize the braking of the five-axis table when carrying workpieces of different weights.

[0045] Furthermore, a friction ring 178 is provided between the first screw 176 and the piston plate 163, a rotating portion 1631 is provided at the center of the piston plate 163, the rotating portion 1631 and the friction ring 178 correspond to each other, a bracket 166, a second sleeve 167 and a second screw 165 are also installed in the chamber 1611, one end of the second sleeve 167 is fixedly connected to the rotating portion 1631, one end of the second screw 165 extends into the second sleeve 167 and forms a threaded fit with the second sleeve 167, the other end of the second screw 165 is fixedly connected to the bracket 166, and the bracket 166 is fixedly installed on the inner wall of the chamber 1611;

[0046] When the second transmission shaft 174 rotates, the second screw 165 is driven to rotate in the process of horizontal movement, and the friction ring 178 is driven to rotate in the process of horizontal movement. When the friction ring 178 contacts the rotating part 1631, since the rotating part 1631 is limited in the chamber 1611 by the second sleeve 167 and the second screw 165, after the friction ring 178 contacts the rotating part 1631, the friction ring 178 drives the rotating part 1631 to rotate synchronously through the friction force with the side of the rotating part 1631. The rotation of the rotating part 1631 drives the second sleeve 167 to rotate synchronously, that is, the second sleeve 167 rotates on the fixed second screw 165. At this time, the second sleeve 167 gradually moves horizontally to the side away from the friction ring 178, and drives the piston plate 163 to move horizontally as a whole, so as to adjust the volume of the pressure chamber 161.

[0047] When the cylinder 152 drives the second connecting block 12 to reset and rise, the gear 171 is meshed with the rack 172 and then resets and rotates, and drives the first transmission shaft 173 and the second transmission shaft 174 to reset and rotate. The reset rotation of the second transmission shaft 174 drives the first screw 176 to reset and rotate in the first sleeve 175. At this time, the telescopic section 177 begins to contract, and the first screw 176 gradually moves to the side away from the piston plate 163, and drives the friction ring 178 to move synchronously. The friction ring 178 gradually disengages from the rotating portion 1631 on the piston plate 163, and the piston plate 163 is in a state of being ... The second sleeve 167 and the second screw 165 are arranged so that the friction between the second sleeve 167 and the second screw 165 is relatively large. Therefore, when the hydraulic oil is injected into the pressure chamber 161, the pressure increase in the pressure chamber 161 will not force the second sleeve 167 to rotate on the second screw 165, that is, the piston plate 163 will not move to the side away from the brake ring 164 as the pressure increases, thereby achieving the locking of the piston plate 163 after the position adjustment;

[0048] Furthermore, when processing a variety of different workpieces, the weights of different workpieces are different. When the piston plate 163 has been adjusted when the first workpiece is placed, the resetting of the gear 171, the first transmission shaft 173 and the second transmission shaft 174 will not drive the piston plate 163 to reset and move. Therefore, in the present embodiment, the volume adjustment of the pressure chamber 161 is irreversible, that is, the volume size of the pressure chamber 161 can only be adjusted to be smaller, but not to be adjusted to be larger. Because when processing a variety of different workpieces, the weights of different workpieces are different, when the piston plate 163 has been adjusted when the first workpiece is placed, when the second workpiece is placed, if the weight of the second workpiece is greater than the weight of the first workpiece, the descending amplitude of the second connecting block 12 is increased, and the number of rotations of the second transmission shaft 174 driven by the gear 171 through the first transmission shaft 173 is greater than the number of rotations when the first workpiece is placed, that is, the horizontal movement amplitude of the friction ring 178 is greater than the movement amplitude when the first workpiece is placed, and the friction ring 178 is The piston plate 163 is moved to the side close to the brake ring 164 by the rotating portion 1631, and the volume of the pressure chamber 161 continues to decrease; on the contrary, when the weight of the second workpiece is less than the weight of the first workpiece, the friction ring 178 will not contact the rotating portion 1631, and will not drive the piston plate 163 to move. Because in this embodiment, the greater the weight of the workpiece, the greater the torsional load on the third driving mechanism 4. At this time, the greater the deformation amplitude of the brake ring 164, the greater the deformation amplitude of the brake ring 164. The greater the clamping force of the circumference of the surface 13, the larger the contact area, and the greater the wear between the brake ring 164 and the five-axis table 13. If the deformation amplitude of the brake ring 164 is reduced at this time, the brake ring 164 may not be able to firmly hold the circumference of the five-axis table 13 when it is deformed slightly due to the wear caused by the large deformation. Therefore, the irreversible adjustment method of the volume of the pressure chamber 161 can avoid the five-axis table 13 from not being effectively braked when a lighter workpiece is placed on the five-axis table 13 in the future.

[0049] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that 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 above 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 split cradle mechanism for a five-axis machine tool, rotatably connected to the five-axis machine tool, characterized in that: It includes a first connecting block, a second connecting block and a five-axis table. The second connecting block is slidably connected to the first connecting block. A buffer component is installed inside the first connecting block. The five-axis table is installed on the second connecting block. When the workpiece is placed on the five-axis table, the second connecting block slides on the first connecting block under the influence of gravity. The buffer component is used to buffer the second connecting block when it descends.

2. A split cradle mechanism for a five-axis machine tool according to claim 1, characterized in that: The five-axis machine tool comprises a bed body, which comprises two groups of vertically arranged support plates and a base, a cradle mechanism is installed between the two groups of support plates, and the bottom of the support plates is connected to the base.

3. A split cradle mechanism for a five-axis machine tool according to claim 2, characterized in that: The cradle mechanism is mounted on the support plate through a flange.

4. The split cradle mechanism for a five-axis machine tool according to claim 1, characterized in that: The buffer assembly includes a spring, a sliding groove is provided on a side of the first connecting block close to the second connecting block, a sliding block is provided on the corresponding side of the second connecting block, the sliding block is located inside the sliding groove and forms a sliding guide with the sliding groove, the spring is installed inside the sliding groove, one end of the spring is connected to the groove wall of the sliding groove, and the other end is connected to the sliding block.

5. The split cradle mechanism for a five-axis machine tool according to claim 4, characterized in that: A cylinder is also fixedly installed inside the first connecting block, and a telescopic shaft at the output end of the cylinder extends into the interior of the slide groove.

6. The split cradle mechanism for a five-axis machine tool according to claim 4, characterized in that: A limiting ring is fixedly installed on the second connecting block. The limiting ring is sleeved on the outer wall of the five-axis table and is rotatably connected to the limiting ring. A hydraulic brake assembly is installed inside the limiting ring. The hydraulic brake assembly is used to brake the five-axis table.

7. The split cradle mechanism for a five-axis machine tool according to claim 6, characterized in that: The hydraulic brake assembly includes a pressure chamber and a brake ring. The pressure chamber is opened inside the limit ring. The brake ring is arranged on the inner wall of the limit ring and is located between the limit ring and the five-axis table. An oil circuit is also opened inside the limit ring. One end of the oil circuit is connected to the pressure chamber, and the other end is connected to an external oil pump.

8. The split cradle mechanism for a five-axis machine tool according to claim 7, characterized in that: An adjusting component is also installed in the second connecting block, and the adjusting component can adjust the size of the pressure chamber according to the weight of the workpiece.

9. The split cradle mechanism for a five-axis machine tool according to claim 8, characterized in that: The adjusting assembly includes a transmission member and a piston plate. A chamber is arranged in the pressure chamber. The piston plate is installed inside the chamber and forms a dynamic sealing connection with the chamber. The transmission member is installed inside the second connecting block. The transmission member is used to drive the piston plate to move horizontally in the chamber when the second connecting block descends.

10. A split cradle mechanism for a five-axis machine tool according to claim 9, characterized in that: The pressure chamber consists of a chamber and an oil pressure chamber. The chamber is connected to the oil pressure chamber. Two groups of chambers are arranged and symmetrically distributed along the oil pressure chamber. The brake ring is located inside the oil pressure chamber, and one end of the oil circuit is connected to the oil pressure chamber.

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