Cradle type rotary table

Abstract

The utility model provides a cradle type rotary table, and belongs to the technical field of machine tool equipment. The problem that a braking mechanism is slow to reset when braking of an existing cradle type rotary table is relieved is solved. The cradle type rotary table comprises a base, a supporting seat and a rotary table body, a rotating shaft is arranged in the base, a disc-shaped brake pad is fixedly connected to the rotating shaft, a brake disc and a hydraulic cylinder which are located on the two sides of the brake pad respectively are fixedly connected into the base, and one end of a piston of the hydraulic cylinder can abut against the brake pad so that the brake pad can be tightly pressed on the brake disc. The other end of a piston of the hydraulic cylinder is fixedly connected with a reset rod, a stress part is arranged on the reset rod, an abutting part is arranged on a cylinder body of the hydraulic cylinder and located between the stress part and the piston of the hydraulic cylinder, an elastic piece is arranged between the stress part and the abutting part, and when one end of the piston of the hydraulic cylinder abuts against the brake pad, the elastic piece is in a compressed state. When braking of the cradle type rotary table is relieved, the piston of the hydraulic cylinder can be driven by the elastic piece to reset immediately, and the braking mechanism can reset quickly.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tool equipment and relates to a cradle-type turntable. Background Art

[0002] High-end CNC machine tools boast multifunctional features such as high speed, high precision, intelligence, compound functions, multi-axis linkage, and internet communication. Their development level is an important indicator of a country's modern industrialization. Five-axis machining centers, one type of high-end CNC machine tool, are capable of five-axis machining and can produce complex and precise parts. They are primarily used in industries such as aerospace, military, high-precision medical equipment, tool manufacturing, and mold manufacturing.

[0003] Chinese patent literature has publicly proposed a worm pair-torque driven cradle turntable [Announcement No.: CN216541900U]. The two ends of the U-shaped swing frame are supported by the rotating shaft in the bearing seats of the support end seat and the transmission end seat respectively; a worm wheel and a worm that mesh with each other are provided in the transmission end seat, and the worm wheel is coaxially connected to the A rotating shaft; the two ends of the worm are supported in the bearing seat in the transmission end seat, and one end of the worm extends out of the transmission end seat and is connected to the large pulley; a servo motor is connected to the outside of the transmission end seat through a bracket, and the output shaft of the servo motor is parallel to the axis of the worm, and a small pulley is connected to the output shaft of the servo motor, and the large pulley and the small pulley are connected by a belt for transmission; a C-axis box is provided in the swing frame, and the C-axis box is connected to the C rotating shaft through a torque motor, and the bottom of the rotating table is connected to the C rotating shaft. A hydraulic ring brake is provided on the outer circumference of rotating shaft A. When braking, the hydraulic ring brake realizes the clamping and braking of rotating shaft A by applying hydraulic pressure. When braking is released, the hydraulic ring brake releases pressure, and the brake pads return to their original position and no longer clamp rotating shaft A.

[0004] However, in the above-mentioned hydraulic ring brake, the hydraulic oil is in direct contact with the brake pads. When the brake is released, that is, when the hydraulic ring brake is depressurized, the brake pads cannot be immediately reset due to the viscosity of the hydraulic oil, resulting in a slow reset of the brake when the brake is released, which is not conducive to improving processing efficiency. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems existing in the prior art and propose a cradle-type turntable, which solves the technical problem of the slow reset of the brake mechanism of the prior cradle-type turntable when the brake is released.

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

[0007] The cam is fixedly mounted on the support frame and is provided with a movable frame, the movable frame being fixedly mounted on the support frame and being capable of being rotated.

[0008] The hydraulic cylinder, brake pads and brake discs constitute the braking mechanism. During braking, the hydraulic cylinder works and generates hydraulic pressure. The piston in the hydraulic cylinder moves toward the brake pads and presses against the brake pads to press the brake pads against the brake disc, thereby fixing the rotating shaft on the base and braking the turntable. At this time, the elastic member is in a compressed state and stores compression potential energy. When the brakes are released, the hydraulic cylinder releases pressure, and the compression potential energy of the elastic member is converted into kinetic energy. The elastic force of the elastic member acts on the force-bearing part and drives the reset rod and the piston to overcome the viscosity of the hydraulic oil and immediately move away from the brake pads. The brake pads are no longer pressed against the brake disc, and the rotating shaft and turntable can rotate. Therefore, when the brakes are released, the cradle-type turntable can drive the piston of the hydraulic cylinder to reset immediately through the elastic member, so that the brake mechanism is quickly reset, which is beneficial to improving processing efficiency.

[0009] In the aforementioned cradle-type turntable, the hydraulic cylinder's piston is annular, and there are multiple reset rods arranged in sequence along the circumference of the hydraulic cylinder's piston. Each reset rod is provided with an elastic member. This ensures that the hydraulic cylinder's piston is evenly stressed, allowing the piston to be quickly reset, thereby facilitating rapid resetting of the brake mechanism.

[0010] In the aforementioned cradle-style turntable, the hydraulic cylinder piston has a protruding ring on its end facing the brake pad. The outer diameter of the brake pad is larger than that of the ring. During braking, the ring abuts against the brake pad, creating a braking effect. The ring's end surface area is smaller than that of the hydraulic cylinder piston, making it easier to maintain flatness during machining. This results in a more even distribution of braking force around the circumference, ensuring effective braking.

[0011] In the aforementioned cradle-type turntable, the elastic member comprises a compression spring or disc spring mounted on the reset lever. Thus, the reset lever not only axially positions the compression spring or disc spring, but also radially limits it, ensuring stable operation of the compression spring or disc spring and facilitating rapid resetting of the brake mechanism.

[0012] In the above-mentioned cradle type turntable, a first groove is provided on the end face of the brake disc facing the hydraulic cylinder, and a second groove is provided on the bottom surface of the first groove. One end of the cylinder block of the hydraulic cylinder is embedded in the first groove and abuts against the bottom surface of the first groove, and the brake pad is located in the second groove. The first groove and the second groove have the function of installation and positioning, so that the positions of the brake pad and the hydraulic cylinder relative to the brake disc are accurate, thus enabling the smooth progress of the braking and brake release operations.

[0013] In the above-mentioned cradle type turntable, a protective cover is fixed on the cylinder block of the hydraulic cylinder, and an avoidance groove is provided on the protective cover. The end of the reset rod facing away from the brake pad is located in the avoidance groove. The protective cover protects the reset rod and the elastic member, preventing sundries from contacting the elastic member and affecting the reset of the piston of the hydraulic cylinder.

[0014] Compared with the prior art, the present utility model has the following advantages:

[0015] When the hydraulic cylinder releases the brake, the elastic member can immediately reset the piston of the hydraulic cylinder, ensuring the rapid reset of the braking mechanism. The first groove and the second groove are provided on the brake disc. The hydraulic cylinder is located in the first groove, and the brake pad is located in the second groove, making the installation positions of the brake pad and the hydraulic cylinder accurate and ensuring the smooth progress of braking and brake release. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of the present cradle type turntable.

[0017] Figure 2 is a cross-sectional view of the base of the present cradle type turntable.

[0018] Figure 3 is Figure 2 an enlarged view of part A in

[0019] In the figure, 1. Base; 2. Support seat; 3. Turntable; 4. Rotating shaft; 4a. Left shaft; 4a1. Convex ring; 4a2. Anti-slip groove; 4b. Intermediate shaft; 4c. Right shaft; 5. Brake pad; 6. Brake disc; 6a. First groove; 6b. Second groove; 7. Hydraulic cylinder; 7a. Cylinder block; 7a1. Abutting part; 7b. Piston; 7b1. Ring; 7c. Reset rod; 7c1. Force-receiving part; 7d. Elastic member; 7e. Protective cover; 7e1. Avoidance groove; 8. Bearing bracket; 9. Positioning pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following are specific embodiments of the present utility model in combination with the accompanying drawings, further describing the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0021] As Figure 1 and Figure 2As shown in the figure, a cradle turntable includes a base 1, a support base 2, and a turntable 3 connected between the base 1 and the support base 2. A rotatable shaft 4 is penetrated and supported in the base 1, and a rotatable rotating shaft is penetrated and supported in the support base 2. Both ends of the turntable 3 are fixedly connected to the shaft 4 and the rotating shaft respectively. In order to make the rotating shaft rotate smoothly, a bearing is provided between the rotating shaft and the support base 2. The shaft 4 can be an integral structure or a split structure. When the shaft 4 is a split structure, the shaft 4 includes a left shaft 4a, an intermediate shaft 4b, and a right shaft 4c that are fixedly connected in sequence along the axial direction, wherein the right shaft 4c is fixedly connected to the turntable 3. A left shaft 4a bearing is provided between the left shaft 4a and the base 1, and a right shaft 4c bearing is provided between the right shaft 4c and the base 1. A bearing bracket 8 is fixedly installed inside the left end of the base 1, and the left shaft 4a bearing is installed on the bearing bracket 8.

[0022] As Figure 2 and Figure 3As shown, on the left shaft 4a, on the right side of the bearing bracket 8, there is a disk-shaped brake pad 5 fixedly connected. On the left shaft 4a, there is a protruding collar 4a1. The inner edge of the brake pad 5 abuts against the left end face of the collar 4a1 and is fixedly connected by screws. On the end face of the collar 4a1, there are anti-slip grooves 4a2. At the position of the anti-slip grooves 4a2 on the collar 4a1, there is a positioning pin 9 fixed. The positioning pin 9 passes through the positioning holes on the inner edge of the brake pad 5, making the positioning of the brake pad 5 accurate and the fixation stable. Inside the base 1, there are a brake disc 6 and a hydraulic cylinder 7 fixedly connected on both sides of the brake pad 5 respectively. The brake disc 6 is located on the right side of the brake pad 5, and the hydraulic cylinder 7 is located on the left side of the brake pad 5. The hydraulic cylinder 7 includes a cylinder block 7a fixedly connected to the base 1 and a piston 7b that can slide axially along the rotating shaft 4 inside the cylinder block 7a. A sealing ring is arranged between the piston 7b and the cylinder block 7a, and the sealing ring is fixed on the cylinder block 7a. An opening is formed on the right end face of the cylinder block 7a, and the piston 7b can extend out from the opening. On the left side of the piston 7b on the cylinder block 7a, there is an oil inlet hole [not shown in the figure] communicating with the inner cavity of the cylinder block 7a. When oil enters the oil inlet hole, it can drive the piston 7b to slide to the right. Inside the base 1, there is a shoulder. On the outer side face of the brake disc 6, there is a retaining ring, and the retaining ring abuts against the shoulder and is fixedly connected by bolts. On the left end face of the brake disc 6, there is a first groove 6a, and on the bottom surface of the first groove 6a, there is a second groove 6b. The right end of the cylinder block 7a is embedded in the first groove 6a and abuts against the bottom surface of the first groove 6a. The cylinder block 7a is fixedly connected to the brake disc 6 by bolts. The brake pad 5 is located in the second groove 6b, and there is a gap between the right end face of the cylinder block 7a and the brake pad 5. The piston 7b of the hydraulic cylinder 7 is in the shape of a circular ring 7b1, and on the right end face of the piston 7b, there is a protruding circular ring 7b1. The circular ring 7b1 is coaxially arranged with the piston 7b. The outer diameter of the brake pad 5 is larger than the outer diameter of the circular ring 7b1. The right end of the piston 7b can extend out of the cylinder block 7a to make the circular ring 7b1 abut against the brake pad 5, so as to press the brake pad 5 against the brake disc 6. The left end of the piston 7b is fixedly connected with a return rod 7c. The return rod 7c is fixedly connected to the piston 7b by screws. The return rod 7c is hollow, and the screw is arranged in the return rod 7c and is threadedly connected with the piston 7b. The return rod 7c is arranged in the cylinder block 7a. The left end of the return rod 7c extends out of the cylinder block 7a and is provided with a force-receiving part 7c1. On the cylinder block 7a, between the force-receiving part 7c1 and the piston 7b, there is an abutting part 7a1. An elastic member 7d is arranged between the force-receiving part 7c1 and the abutting part 7a1. And when the right end of the piston 7b abuts against the brake pad 5, the elastic member 7d is in a compressed state. There are several return rods 7c and they are arranged in sequence along the circumferential direction of the piston 7b of the hydraulic cylinder 7. An elastic member 7d is arranged on each return rod 7c. The elastic member 7d includes a compression spring or a disc spring sleeved on the return rod 7c. Several disc springs are sleeved on each return rod 7c, and the installation directions of adjacent two disc springs are opposite. A protective cover 7e is fixed on the left end face of the cylinder block 7a. On the protective cover 7e, there is an avoidance groove 7e1 corresponding to the return rod 7c. The left end of the return rod 7c is located in the avoidance groove 7e1.The protective cover 7e is fixedly connected to the cylinder block 7a by screws.

[0023] The hydraulic cylinder 7, the brake pads 5 and the brake disc 6 form a braking mechanism. During braking, oil enters the oil inlet hole of the hydraulic cylinder 7 to generate hydraulic pressure. The piston 7b in the hydraulic cylinder 7 moves towards the brake pads 5 and abuts against the brake pads 5 to press the brake pads 5 against the brake disc 6, so that the rotating shaft 4 is fixed on the base 1 to brake the turntable 3. At this time, the elastic member 7d is in a compressed state and stores compression potential energy. When the braking is released, the hydraulic cylinder 7 is depressurized, the hydraulic pressure disappears, and the compression potential energy of the elastic member 7d is converted into kinetic energy. The elastic force of the elastic member 7d acts on the force-receiving portion 7c1 and drives the reset rod 7c and the piston 7b to immediately move away from the brake pads 5 against the viscous force of the hydraulic oil. The brake pads 5 are no longer pressed against the brake disc 6, and the rotating shaft 4 and the turntable 3 can rotate. Therefore, when the braking is released, the elastic member 7d can drive the piston 7b of the hydraulic cylinder 7 to immediately reset, so that the braking mechanism can be quickly reset.

[0024] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains 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 invention or exceed the scope defined by the appended claims.

Claims

1. A cradle type turntable, comprising a base (1), a support base (2) and a turntable (3) connected between the base (1) and the support base (2), wherein a rotatable rotating shaft (4) is penetrated and supported in the base (1), and the rotating shaft (4) is fixedly connected with the turntable (3), and is characterized in that, A disc-shaped brake pad (5) is fixedly connected to the rotating shaft (4). A brake disc (6) and a hydraulic cylinder (7) are fixedly connected inside the base (1), and are respectively located on both sides of the brake pad (5). One end of the piston (7b) of the hydraulic cylinder (7) can abut against the brake pad (5) to press the brake pad (5) against the brake disc (6). The other end of the piston (7b) of the hydraulic cylinder (7) is fixedly connected to a return rod (7c). A force-receiving portion (7c1) is provided on the return rod (7c). An abutting portion (7a1) is provided on the cylinder body (7a) of the hydraulic cylinder (7) between the force-receiving portion (7c1) and the piston (7b) of the hydraulic cylinder (7). An elastic member (7d) is provided between the force-receiving portion (7c1) and the abutting portion (7a1), and the elastic member (7d) is in a compressed state when one end of the piston (7b) of the hydraulic cylinder (7) abuts against the brake pad (5).

2. The cradle type turntable according to claim 1, characterized in that, The piston (7b) of the hydraulic cylinder (7) is annular. There are several return rods (7c) which are arranged in sequence along the circumferential direction of the piston (7b) of the hydraulic cylinder (7). An elastic member (7d) is provided on each return rod (7c).

3. The cradle type turntable according to claim 2, wherein The end face of the piston (7b) of the hydraulic cylinder (7) facing the brake pad (5) has a protruding ring (7b1). The outer diameter of the brake pad (5) is larger than the outer diameter of the ring (7b1).

4. The cradle type turntable according to claim 1, characterized in that, The elastic member (7d) includes a compression spring or a disc spring sleeved on the return rod (7c).

5. The cradle type turntable according to any one of claims 1-4, characterized in that, A first groove (6a) is provided on the end face of the brake disc (6) facing the hydraulic cylinder (7). A second groove (6b) is provided on the bottom surface of the first groove (6a). One end of the cylinder body (7a) of the hydraulic cylinder (7) is embedded in the first groove (6a) and abuts against the bottom surface of the first groove (6a). The brake pad (5) is located in the second groove (6b).

6. The cradle type turntable according to any one of claims 1-4, characterized in that, A protective cover (7e) is fixed on the cylinder body (7a) of the hydraulic cylinder (7). An avoidance groove (7e1) is provided on the protective cover (7e). The end of the return rod (7c) facing away from the brake pad (5) is located in the avoidance groove (7e1).

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