Cradle type torque turntable

Abstract

The utility model provides a cradle type torque rotary table, and belongs to the technical field of five-axis machining centers. The five-axis machining center brake locking mechanism solves the problem that an existing five-axis machining center is poor in brake locking force. The cradle type torque rotary table comprises a spindle box body, a swing arm, a workbench and a tailstock, a cylindrical stator and a cylindrical rotor are arranged in the spindle box body, the stator is fixed to the spindle box body, the rotor is arranged in the stator in a penetrating mode and can rotate in the circumferential direction relative to the stator, and a brake air cylinder is connected to the inner side of the end, away from the swing arm, of the spindle box body. A plurality of static brake pads are further fixed in the spindle box body, a plurality of dynamic brake pads are fixed on the rotor, the static brake pads and the dynamic brake pads are mutually and alternately stacked in the axial direction of the spindle box body, and a brake piston of the brake air cylinder can move towards the stacking position of the static brake pads and the dynamic brake pads and enables the dynamic brake pads to tightly abut against the static brake pads. The cradle type torque turntable has the advantage of good brake locking force.

Description

Technical Field

[0001] The utility model belongs to the technical field of five-axis machining centers and relates to a cradle-type torque turntable. Background Art

[0002] The five-axis cradle turntable plays an important role in the machining of curved surface parts and belongs to a high-end functional component in numerical control machine tools. Its structural layout preferably adopts the cradle double-swing type.

[0003] At present, the five-axis cradle turntable usually consists of four parts: an A-axis assembly, a swing arm, a workbench assembly (i.e., a C-axis assembly), and a support tailstock. The two ends of the swing arm are respectively connected to the A-axis assembly and the support tailstock, and the workbench assembly is installed on the swing arm. The main function of the A-axis assembly is to support the spindle and drive the swing arm to rotate, and it needs to bear a large overturning moment. The function of the support tailstock is to ensure the rigidity during the rotation of the swing arm and the machining accuracy of the cradle turntable.

[0004] However, when the existing five-axis machining center is in use, there are still the following problems: the locking force of the pneumatic brake cannot meet the braking requirements of the swing axis (A-axis) in a limited space, and it is necessary to enhance the locking force of the brake. Summary of the Utility Model

[0005] The purpose of the present utility model is to address the above-mentioned problems existing in the prior art and propose a cradle-type torque turntable, which solves the problem of poor brake locking force in the existing five-axis machining center.

[0006] The purpose of the present utility model can be achieved by the following technical solutions:

[0007] A cradle-type torque turntable includes a spindle housing, a swing arm, a workbench, and a tailstock. The swing arm is connected between the spindle housing and the tailstock, and the workbench is fixed on the swing arm. It is characterized in that a stator and a rotor, both of which are in a cylindrical shape, are arranged in the spindle housing. The stator is fixed to the spindle housing, the rotor is inserted into the stator and can rotate circumferentially relative to the stator. A brake cylinder is connected to the inner side of the end of the spindle housing away from the swing arm. Several static brake pads are also fixed in the spindle housing, and several dynamic brake pads are fixed on the rotor. The several static brake pads and the several dynamic brake pads are alternately stacked along the axial direction of the spindle housing. The brake piston of the brake cylinder can move towards the stacking position of the static brake pads and the dynamic brake pads and make the dynamic brake pads and the static brake pads closely abut.

[0008] When this cradle - type torque turntable is in use, the motor composed of a stator and a rotor serves as a power source to drive the swing arm to swing, and then drives the workpiece fixed on the workbench to swing for processing. When it needs to stop, air is supplied to the brake cylinder, driving the brake piston to approach the stacking position of the static brake pad and the dynamic brake pad until it tightly presses on the static brake pad and the dynamic brake pad, making the dynamic brake pad and the static brake pad closely abut. Relying on the frictional force between the two, the rotor stops rotating, keeping the workbench and the workpiece fixed on the workbench in a static state.

[0009] In this cradle - type torque turntable, the motor composed of a stator and a rotor is used as a direct driving power source and is connected in cooperation with the corresponding structure, eliminating the intermediate mechanical transmission structure. Fundamentally, it solves the problems of low mechanical transmission efficiency and mechanical wear, and ensures the accuracy. At the same time, several dynamic brake pads and several static brake pads are alternately stacked, that is, several static brake pads and several dynamic brake pads are both arranged at intervals along the axial direction of the main shaft box. Several dynamic brake pads are respectively inserted between two adjacent static brake pads, greatly increasing the frictional force and thus generating a greater locking force.

[0010] In the above - mentioned cradle - type torque turntable, a bottom plate is fixed inside the main shaft box, and several static brake pads are located between the bottom plate and the brake piston of the brake cylinder. Since the static brake pads are located between the bottom plate and the brake piston of the brake cylinder, after the dynamic brake pads extend into the gaps between adjacent static brake pads, they are also located between the bottom plate and the brake piston of the brake cylinder. Relying on the movement of the brake piston and pressing the dynamic brake pads and the static brake pads tightly on the bottom plate, the close abutment between the dynamic brake pads and the static brake pads is realized.

[0011] In the above - mentioned cradle - type torque turntable, the brake piston of the brake cylinder divides the inside of the brake cylinder into an independent brake chamber and an unlocking chamber. The brake chamber and the unlocking chamber are respectively located on both sides of the brake piston, and the unlocking chamber is located on the side of the brake piston facing the static brake pad. A brake spring is arranged in the brake chamber, and the brake piston can move towards the static brake pad under the elastic force of the brake spring. When the brake is needed, air is supplied to the brake chamber, making the brake piston move towards the static brake pad, pressing the dynamic brake pad and the static brake pad tightly to achieve braking. On the contrary, when the brake chamber exhausts and the unlocking chamber is supplied with air, the brake piston moves in the opposite direction, loosening the dynamic brake pad and the static brake pad to release the brake. When a power failure occurs during use, neither the brake chamber nor the unlocking chamber is supplied with air, and the brake piston presses the dynamic brake pad and the static brake pad tightly under the elastic force of the brake spring to achieve automatic power - off braking, avoiding the displacement of the workpiece under the inertial action of components such as the workbench during a power - off situation, which affects the processing accuracy when power is restored.

[0012] In the above-mentioned cradle type torque turntable, the number of the brake cylinders is at least two and they are distributed around the axis of the rotor. Several brake cylinders are arranged around the axis of the rotor, making full use of the gap between the rotor and the main shaft housing, and improving the brake locking force without additional space.

[0013] In the above-mentioned cradle type torque turntable, both the moving brake pads and the static brake pads are annular. The annular brake pads can ensure the relative position with the static brake pads after the moving brake pads rotate with the rotor, thus ensuring the effectiveness and stability of braking.

[0014] In the above-mentioned cradle type torque turntable, a tailstock brake pad and a braking cylinder are arranged inside one end of the tailstock far away from the swing arm. The braking piston of the braking cylinder divides a braking chamber in the braking cylinder, and the braking chamber is located on the other side of the braking piston relative to the tailstock brake pad. A return spring is arranged on the side of the braking piston of the braking cylinder facing the tailstock brake pad, and the braking piston of the braking cylinder can move away from the tailstock brake pad under the elastic force of the return spring. The braking chamber and the above-mentioned brake chamber are always connected through a pipeline. Since the braking chamber and the brake chamber are always connected, they are connected to the same air source. When braking by ventilation, the brake cylinder at the main shaft housing and the braking cylinder at the tailstock can achieve synchronous braking to increase the locking torque. In this way, there is no need to increase the locking force by increasing the volume of the brake cylinder. Without affecting the space limitation of the turntable, the superposition of the cylinder thrust is achieved by increasing the number of cylinders at the tailstock, thereby increasing the locking force.

[0015] Compared with the prior art, the present cradle type torque turntable has the following advantages:

[0016] 1. The motor composed of a stator and a rotor is used as a direct driving power source and is connected with the corresponding structure in cooperation, eliminating the intermediate mechanical transmission structure, fundamentally solving the problems of low mechanical transmission efficiency and mechanical wear, and ensuring the accuracy.

[0017] 2. Several moving brake pads and several static brake pads are alternately stacked, that is, several static brake pads and several moving brake pads are both arranged at intervals along the axial direction of the main shaft housing, and several moving brake pads are respectively inserted between two adjacent static brake pads, greatly increasing the friction force and thus generating a greater locking force.

[0018] 3. The braking chamber and the brake chamber are always connected, so they are connected to the same air source. When braking by ventilation, the brake cylinder at the main shaft housing and the braking cylinder at the tailstock can achieve synchronous braking at both ends to increase the locking torque. In this way, there is no need to increase the locking force by increasing the volume of the brake cylinder and the volume of the main shaft housing. Without affecting the space limitation of the turntable, the superposition of the cylinder thrust is achieved by increasing the number of cylinders at the tailstock, thereby increasing the locking force. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the partial sectional structure of this cradle - type torque turntable.

[0020] Figure 2 It is a schematic diagram of the sectional structure at the brake cylinder in this cradle - type torque turntable.

[0021] Figure 3 It is a schematic diagram of the sectional structure at the braking cylinder in this cradle - type torque turntable.

[0022] In the figure, 1 is the main - shaft box body; 2 is the swing arm; 3 is the workbench; 4 is the tailstock; 5 is the stator; 6 is the rotor; 7 is the brake cylinder; 71 is the brake piston; 72 is the brake cavity; 73 is the unlocking cavity; 8 is the static brake pad; 9 is the dynamic brake pad; 10 is the bottom plate; 11 is the brake spring; 12 is the tailstock brake pad; 13 is the braking cylinder; 131 is the braking cavity; 132 is the braking piston; 14 is the return spring. Specific embodiments

[0023] The following are specific embodiments of the present utility model and in combination with the attached drawings, the technical solutions of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0024] As Figure 1 shown, this cradle - type torque turntable includes a main - shaft box body 1, a swing arm 2, a workbench 3 and a tailstock 4. The swing arm 2 is swingably connected between the main - shaft box body 1 and the tailstock 4, and the workbench 3 is fixed on the swing arm 2. A stator 5 and a rotor 6, both of which are in a cylindrical shape, are arranged in the main - shaft box body 1. The stator 5 is fixed to the main - shaft box body 1, and the rotor 6 is disposed inside the stator 5 and is supported by bearings sleeved outside the rotor 6 and can rotate circumferentially relative to the stator 5. Inside the end of the main - shaft box body 1 away from the swing arm 2, a brake cylinder 7 is connected. There are at least two brake cylinders 7 and they are distributed around the axis of the rotor 6.

[0025] As Figure 2As shown in the figure, a bottom plate 10 in the shape of an annular plate is also fixed inside the main shaft housing 1. On the side of the bottom plate 10 facing the brake cylinder 7, several static brake pads 8 are fixed. On the rotor 6, several dynamic brake pads 9 are fixed. The several static brake pads 8 and the several dynamic brake pads 9 are alternately stacked on top of each other. The brake piston 71 of the brake cylinder 7 can move towards the stacking position of the static brake pads 8 and the dynamic brake pads 9 and press the dynamic brake pads 9 and the static brake pads 8 tightly against the bottom plate 10 to achieve braking. In this embodiment, the several static brake pads 8 and the several dynamic brake pads 9 being alternately stacked on top of each other means that the several static brake pads 8 and the several dynamic brake pads 9 are both arranged at intervals along the axial direction of the main shaft housing 1, and the several dynamic brake pads 9 are respectively partially inserted between two adjacent static brake pads 8; preferably, the arrangement order of the alternately stacked positions along the axial direction of the main shaft housing 1 is dynamic brake pad 9, static brake pad 8, dynamic brake pad 9, static brake pad 8... The dynamic brake pads 9 and the static brake pads 8 can both be annular, or existing sheet-shaped brake pads can be distributed in a ring shape to form an annular structure.

[0026] The brake piston 71 of the brake cylinder 7 divides the inside of the brake cylinder 7 along the axial direction of the main shaft housing 1 into independent brake chamber 72 and unlocking chamber 73 through a sealing ring fixed on the outside of the brake piston 71. The brake chamber 72 and the unlocking chamber 73 are respectively located on both sides of the brake piston 71, and the unlocking chamber 73 is located on the side of the brake piston 71 facing the static brake pad 8. A brake spring 11 is arranged in the brake chamber 72, and the brake piston 71 can move towards the static brake pad 8 under the elastic force of the brake spring 11.

[0027] As Figure 3 shown in the figure, the tailstock 4 includes a tailstock housing and a center shaft rotatably passing through the tailstock housing by means of bearings. A sheet-shaped tailstock brake pad 12 is fixed on the outside of the center shaft. A braking cylinder 13 is arranged inside one end of the tailstock housing away from the swing arm 2, and the tailstock brake pad 12 is located between the braking cylinder 13 and the swing arm 2.

[0028] The braking piston 132 of the braking cylinder 13 divides the inside of the braking cylinder 13 into a braking chamber 131 through a sealing ring fixed on the outside of the braking piston 132, and the braking chamber 131 is located on the other side of the braking piston 132 relative to the tailstock brake pad 12. A return spring 14 is arranged on the side of the braking piston 132 facing the tailstock brake pad 12. A spring seat is fixed inside the tailstock housing and is located between the braking piston 132 and the tailstock brake pad 12. Both ends of the return spring 14 respectively abut against the spring seat and the braking piston 132. The braking piston 132 can move away from the tailstock brake pad 12 under the elastic force of the return spring 14. When the end of the braking piston 132 facing the tailstock brake pad 12 is offset from the position of the spring seat and approaches the tailstock brake pad 12, it can press the tailstock brake pad 12 tightly against the tailstock housing to achieve braking. The braking chamber 131 is always connected to the brake chamber 72 through a pipeline.

[0029] When this cradle - type torque turntable is in use, the motor composed of a stator 5 and a rotor 6 serves as a power source to drive the swing arm 2 to swing, and then drives the workpiece fixed on the workbench 3 to swing for machining.

[0030] When it needs to stop, the air source ventilates the braking chamber 72 of the braking cylinder 7 and the braking chamber 131 of the braking cylinder 13, driving the braking piston 71 to approach the stacking position of the static brake pad 8 and the dynamic brake pad 9 until the static brake pad 8 and the dynamic brake pad 9 are tightly pressed on the bottom plate 10, so that the dynamic brake pad 9 and the static brake pad 8 are in close contact, and the rotation of the rotor 6 is stopped by the frictional force between them. At the same time, the braking piston 132 tightly presses the tailstock brake pad 12 on the tailstock body to brake the central shaft, ensuring that the workbench 3 and the workpiece fixed on the workbench 3 are in a static state.

[0031] On the contrary, the braking chamber 72 and the braking chamber 131 exhaust, ventilate the unlocking chamber 73, the braking piston 71 moves in the reverse direction, loosening the dynamic brake pad 9 and the static brake pad 8 to release the brake; at the same time, the braking piston 132 moves in the reverse direction, loosening the tailstock brake pad 12 to release the brake.

[0032] When a power failure occurs during use, neither the braking chamber 72 nor the unlocking chamber 73 is ventilated, and the braking piston 71 presses the dynamic brake pad 9 and the static brake pad 8 under the elastic force of the braking spring 11 to achieve automatic power - off braking.

[0033] The specific embodiments described in this text are only illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A cradle type torque turntable, comprising a main shaft box body (1), a swing arm (2), a workbench (3) and a tailstock (4), wherein the swing arm (2) is connected between the main shaft box body (1) and the tailstock (4), and the workbench (3) is fixed on the swing arm (2), characterized in that, A stator (5) and a rotor (6), both in a cylindrical shape, are arranged inside the main shaft housing (1). The stator (5) is fixed to the main shaft housing (1). The rotor (6) is inserted into the stator (5) and can rotate circumferentially relative to the stator (5). Inside the end of the main shaft housing (1) away from the swing arm (2), a brake cylinder (7) is connected to the inner side. Inside the main shaft housing (1), several static brake pads (8) are also fixed. Several dynamic brake pads (9) are fixed on the rotor (6). The several static brake pads (8) and the several dynamic brake pads (9) are alternately stacked along the axial direction of the main shaft housing (1). The brake piston (71) of the brake cylinder (7) can move towards the stacking position of the static brake pads (8) and the dynamic brake pads (9) and make the dynamic brake pads (9) and the static brake pads (8) closely abut against each other.

2. The cradle type torque turntable according to claim 1, wherein A bottom plate (10) is fixed inside the main shaft housing (1). Several of the static brake pads (8) are located between the bottom plate (10) and the brake piston (71) of the brake cylinder (7).

3. A cradle-type torque turntable according to claim 1 or 2, characterized in that, The brake piston (71) of the brake cylinder (7) divides the inside of the brake cylinder (7) into an independent brake chamber (72) and an unlocking chamber (73). The brake chamber (72) and the unlocking chamber (73) are respectively located on both sides of the brake piston (71), and the unlocking chamber (73) is located on the side of the brake piston (71) facing the static brake pads (8). A brake spring (11) is arranged inside the brake chamber (72). The brake piston (71) can move towards the static brake pads (8) under the elastic force of the brake spring (11).

4. A cradle type torque turntable according to claim 1 or 2, characterized in that, The number of the brake cylinders (7) is at least two and they are distributed around the axis of the rotor (6).

5. A cradle type torque turntable according to claim 1 or 2, characterized in that Both the dynamic brake pads (9) and the static brake pads (8) are in a ring shape.

6. The cradle type torque turntable according to claim 3, wherein Inside the end of the tailstock (4) away from the swing arm (2), a tailstock brake pad (12) and a braking cylinder (13) are arranged. The braking piston (132) of the braking cylinder (13) divides the inside of the braking cylinder (13) into a braking chamber (131), and the braking chamber (131) is located on the other side of the braking piston (132) relative to the tailstock brake pad (12). A return spring (14) is arranged on the side of the braking piston (132) of the braking cylinder (13) facing the tailstock brake pad (12). The braking piston (132) of the braking cylinder (13) can move away from the tailstock brake pad (12) under the elastic force of the return spring (14). The braking chamber (131) is always connected to the above-mentioned brake chamber (72) through a pipeline.

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