Brake device for servo press

Abstract

The utility model discloses a brake device for a servo press, which comprises a frame, a servo motor and a crankshaft are arranged on the frame, and the servo motor drives the crankshaft to rotate; a pneumatic brake mechanism is arranged on an output shaft of the servo motor and located at the input end of the crankshaft. The pneumatic braking mechanism provides braking force for an output shaft of the servo motor, and braking is achieved. The servo motor braking device has the advantages that the starting mechanism is additionally arranged on the output shaft of the servo motor, braking force is provided for the output shaft of the servo motor through the pneumatic braking mechanism, braking is achieved, signal interference existing in the prior art is effectively avoided, and meanwhile braking efficiency and reliability are improved.

Description

Technical Field

[0001] This utility model belongs to the field of press technology, and in particular relates to a braking device for a servo press. Background Technology

[0002] A servo press is an advanced press that uses a servo motor as its power source. It can achieve precise pressure and displacement control and is widely used in metal forming, press fitting, and other fields. Patent CN213637416U, "A Servo Press Motor Assembly Structure", reveals the specific structure of a commonly used servo press.

[0003] The servo presses disclosed in the prior art, including the aforementioned patents, typically utilize an electromagnetic brake within the servo motor controlled by a control system. This design allows for precise control of the motor's start and stop, but it also presents several challenges. In practical applications, it has been found that the control system not only controls the servo motor but also the braking system via electromagnetic control, which can lead to interference between the two signals, affecting the system's stability and reliability. Furthermore, the use of electromagnetic brake control means that the electromagnetic brake components may malfunction due to various reasons, such as slow or erratic movement. These problems may stem from physical wear of the electromagnetic brake, signal interference, or defects in the control system. These failures reduce the reliability of the servo press and limit its performance in high-precision applications.

[0004] To address the aforementioned problems, designing a braking device for a servo press is an important technical issue that those skilled in the art need to resolve. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned problems in the prior art and to provide a braking device for a servo press.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A braking device for a servo press includes a frame on which a servo motor and a crankshaft are mounted. The servo motor drives the crankshaft to rotate. A pneumatic braking mechanism is mounted on the output shaft of the servo motor and is located at the input end of the crankshaft. The pneumatic braking mechanism provides braking force to the output shaft of the servo motor to achieve braking.

[0008] Preferably, the pneumatic braking mechanism includes at least a housing and a retainer fixedly connected to the frame, and a set of brake assemblies disposed on the retainer; the brake assemblies include a set of first brake pads and second brake pads spaced apart, the first brake pads being sleeved on the retainer, and the second brake pads being connected to the outer periphery of the retainer via internal and external teeth; in the initial state, the set of first brake pads are spaced apart; in the braking state, the brake assemblies move toward the housing until all the first brake pads abut against the second brake pads, causing the gears disposed on the second brake pads to stop rotating.

[0009] Preferably, the pneumatic braking mechanism further includes a cylinder mounted on a movable plate; the movable plate is sleeved on the output shaft of the servo motor; both sides of the movable plate are connected to the retainer by bolts, and there is a gap between the movable plate and the retainer.

[0010] Preferably, the output end of the cylinder passes through the movable plate, and a slider is provided on the output end of the cylinder. The slider is embedded in the mounting groove of the cage. In the initial state, the cylinder supplies air to the mounting groove, driving the slider and the movable plate to move towards the opening of the mounting groove, thereby driving the first brake pad to move synchronously, increasing the distance between two adjacent brake pads and reducing the braking force. In the braking state, the cylinder stops working, the slider and the movable plate move synchronously towards the bottom of the mounting groove, and at the same time, the brake assembly moves towards the housing, reducing the distance between the brake assemblies and increasing the braking force, until the slider abuts against the bottom of the mounting groove.

[0011] Preferably, the pneumatic braking mechanism further includes a drive spring disposed within the retainer, with both ends of the drive spring abutting against the first brake pad and the bolt, respectively; in the initial state, the spring force driving the elastic element is zero, and the cylinder drives the brake assembly to move towards the proximal end; in the braking state, the drive spring is activated, driving the retainer to move towards the distal end until a set of brake pads are tightly pressed together.

[0012] Preferably, a connecting shaft passes through the end of the first brake pad and is bolted to the cage; a return spring is provided on the connecting shaft; in the initial state, the return spring drives the first brake pad to move toward the cage until it is reset; in the braking state, the return spring is compressed by force.

[0013] Preferably, the diameter of the first brake pad is larger than the diameter of the second brake pad.

[0014] Preferably, the cage is provided with a tensioning structure, which is sleeved on the output shaft of the servo motor.

[0015] The advantages of this utility model's technical solution are mainly reflected in:

[0016] A pneumatic braking mechanism is added to the output shaft of the servo motor. The pneumatic braking mechanism provides braking force to the output shaft of the servo motor to achieve braking, effectively avoiding signal interference existing in the prior art, and improving braking efficiency and reliability.

[0017] Pneumatic braking is achieved by combining cylinders and brake assemblies, and then fully automated operation is achieved by using drive springs and return springs. This ensures braking reliability while improving automation performance and reducing labor costs.

[0018] The output shaft of the servo motor is connected to the cage through a tensioning device, which ensures the reliability of the connection between the two and the connection method is simple. The wear generated during practical use is low, which extends the service life of the output shaft and the cage. Attached Figure Description

[0019] Figure 1 : A partial cross-sectional view of the overall structure of the preferred embodiment of this utility model;

[0020] Figure 2 Cross-sectional view of the pneumatic braking mechanism of a preferred embodiment of this utility model. Detailed Implementation

[0021] The purpose, advantages, and features of this utility model will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this utility model, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.

[0022] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0023] like Figure 1As shown, this utility model discloses a braking device for a servo press, including a frame 1, on which a servo motor 2 and a crankshaft 3 are mounted. The servo motor 2 drives the crankshaft 3 to rotate; specifically, a gear shaft is coaxially mounted on the output shaft of the servo motor 2, and the input end of the crankshaft 3 meshes with the gear shaft. Since the gear shaft is not the focus of this application and is a known structure, it is not limited here.

[0024] A pneumatic braking mechanism 4 is provided on the output shaft of the servo motor 2, and the pneumatic braking mechanism 4 is located at the input end of the crankshaft 3. Furthermore, the pneumatic braking mechanism 4 is located on the output shaft of the servo motor 2 and close to the gear shaft. By adding a starting mechanism to the output shaft of the servo motor, braking force is provided to the output shaft of the servo motor 2 through the pneumatic braking mechanism 4, effectively avoiding signal interference present in the prior art, while improving braking efficiency and reliability.

[0025] like Figure 2 As shown, the pneumatic braking mechanism 4 includes at least a housing 40 and a retainer 41 fixedly connected to the frame 1, and a set of brake assemblies 42 disposed on the retainer 41. A tensioning structure 411 is provided inside the retainer 41, and the tensioning structure 411 is sleeved on the output shaft of the servo motor 2. The tensioning structure ensures a reliable connection between the retainer 41 and the output shaft of the servo motor 2, and this tensioning structure can be a known existing structure including a tensioning shaft. The brake assembly 42 includes a set of spaced-apart first brake pads 421 and second brake pads 422, and the diameter of the first brake pad 421 is preferably larger than the diameter of the second brake pad 422.

[0026] Furthermore, the first brake pad 421 is sleeved on the retainer 41, and a connecting shaft 12 passes through the end of the first brake pad 421 and is bolted to the retainer 41; a return spring 121 is provided on the connecting shaft 12. There are at least two connecting shafts 12, which are symmetrically arranged on the first brake pad 421. In the initial state, the return spring 121 drives the first brake pad 421 to move toward the retainer 41 until it is reset. During the reset process, the first brake pad 421 and the second brake pad 422 move toward the proximal end, that is, gradually move away from the housing 40, reducing the braking force between the second brake pad 422 and the retainer 41, so that the output shaft of the servo motor 2 can rotate relative to the retainer 41. In the braking state, the return spring 121 is compressed by force, and at the same time the first brake pad 421 and the second brake pad 422 move to the far end, that is, gradually approach the housing 40, increasing the braking force between the second brake pad 422 and the retainer 41, until the second brake pad 422 and the first brake pad 421 move to the limit position, so that the second brake pad 422 is interference-fitted with the output shaft of the servo motor 2 to stop its rotation.

[0027] The second brake pad 422 is connected to the outer periphery of the retainer 41 via internal and external teeth. Initially, a group of first brake pads 421 are spaced apart. In the braking state, the brake assembly 42 moves toward the housing 40 until all the first brake pads 421 abut against the second brake pads 422, causing the gears mounted on the second brake pads 422 to stop rotating.

[0028] The pneumatic braking mechanism 4 also includes a cylinder 43 mounted on the movable plate 11. The movable plate 11 is sleeved on the output shaft of the servo motor 2; both sides of the movable plate 11 are connected to the retainer 41 by bolts, and there is a gap between the movable plate 11 and the retainer 41 to facilitate the movement of the movable plate 11. Specifically, a smooth section is formed on the bolts connecting the movable plate 11 and the retainer 41, and the movable plate 11 is located on and moves on the smooth section.

[0029] Furthermore, the output end of the cylinder 43 passes through the moving plate 11, and a slider 431 is provided on the output end of the cylinder 43. The slider 431 is embedded in the mounting groove 410 of the retainer 41. In the initial state, the cylinder 43 is activated and air is supplied to the mounting groove 410, driving the slider 431 and the moving plate 11 to move towards the opening of the mounting groove 410; at the same time, the return spring 121 works, thereby driving the first brake pad 421 to move synchronously, increasing the distance between two adjacent brake pads 421 and reducing the braking force. In the braking state, the cylinder 43 stops working, the slider 431 and the moving plate 11 move synchronously towards the bottom of the mounting groove 410, and at the same time, the brake assembly 42 moves towards the housing 1. The return spring 121 is compressed, reducing the distance between the brake assemblies 42 and increasing the braking force, until the slider 431 abuts against the bottom of the mounting groove 410.

[0030] Furthermore, the pneumatic braking mechanism 4 also includes a drive spring 44 disposed within the retainer 41, with both ends of the drive spring 44 abutting against the first brake pad 421 and the bolt, respectively. In the initial state, the spring force driving the elastic element 44 is zero, and the cylinder 43 drives the brake assembly 42 to move proximally. In the braking state, the drive spring 44 is activated, simultaneously overcoming the spring force of the return spring 121, driving the retainer 42 to move distally until the brake pads 42 are tightly pressed together.

[0031] The working process of this utility model is briefly described below:

[0032] In the initial state, the cylinder 43 is activated, and the slider 431 drives the moving plate 11 and the brake assembly 42 to move towards the slot of the mounting groove 410 in the retainer 41. At this time, the spring force of the drive spring 44 is zero, and the drive spring 44 drives the first brake pad 421 to move synchronously with the moving plate 11. The return spring 121 gradually releases its spring force, further driving the brake assembly 42 to start, until the moving plate 11 moves to abut against the bolt fixing end, and the return spring 44 is in its natural state.

[0033] In the braking state, the cylinder 43 is closed, and the drive spring 44 is activated, driving the brake assembly 42 to move towards the housing 40 and gradually compressing the return spring 121. At the same time, the moving plate 11 is driven by the force of the drive spring 44 to move the slider 431 towards the bottom of the mounting groove 410. Until the return spring 121 is fully compressed, the first brake pad 421 and the second brake pad 422 abut against each other, so the first brake pad 421 presses against the second brake pad 422, causing the second brake pad 422 to stop rotating. This prevents the shaft of the servo motor 2, which is connected to the second brake pad 422 via internal and external teeth, from rotating, thus achieving mechanical braking.

[0034] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A braking device for a servo press, comprising a frame (1), wherein a servo motor (2) and a crankshaft (3) are mounted on the frame (1), the servo motor (2) driving the crankshaft (3) to rotate; characterized in that: A pneumatic braking mechanism (4) is provided on the output shaft of the servo motor (2), and the pneumatic braking mechanism (4) is located at the input end of the crankshaft (3); the pneumatic braking mechanism (4) provides braking force to the output shaft of the servo motor (2) to achieve braking.

2. The braking device for a servo press according to claim 1, characterized in that: The pneumatic braking mechanism (4) includes at least a housing (40) and a retainer (41) fixedly connected to the frame (1), and a set of brake assemblies (42) disposed on the retainer (41); the brake assemblies (42) include a set of first brake pads (421) and second brake pads (422) spaced apart, the first brake pads (421) being sleeved on the retainer (41), and the second brake pads (422) being connected to the outer periphery of the retainer (41) by internal and external teeth; in the initial state, the set of first brake pads (421) are spaced apart; in the braking state, the brake assemblies (42) move toward the housing (40) until all the first brake pads (421) abut against the second brake pads (422), causing the gears disposed on the second brake pads (422) to stop rotating.

3. The braking device for a servo press according to claim 2, characterized in that: The pneumatic braking mechanism (4) also includes a cylinder (43) mounted on a movable plate (11); the movable plate (11) is sleeved on the output shaft of the servo motor (2); the two sides of the movable plate (11) are connected to the retainer (41) by bolts, and there is a gap between the movable plate (11) and the retainer (41).

4. The braking device for a servo press according to claim 3, characterized in that: The output end of the cylinder (43) passes through the moving plate (11), and a slider (431) is provided on the output end of the cylinder (43). The slider (431) is embedded in the mounting groove (410) of the retainer (41). In the initial state, the cylinder (43) supplies air to the mounting groove (410), driving the slider (431) and the moving plate (11) to move towards the opening of the mounting groove (410), thereby driving the first brake pad (421) to move synchronously, increasing the distance between two adjacent brake pads and reducing the braking force. In the braking state, the cylinder (43) stops working, the slider (431) and the moving plate (11) move synchronously towards the bottom of the mounting groove (410), and at the same time, the brake assembly (42) moves towards the housing (40), reducing the distance between the brake assemblies (42) and increasing the braking force until the slider (431) abuts against the bottom of the mounting groove (410).

5. The braking device for a servo press according to claim 3, characterized in that: The pneumatic braking mechanism (4) further includes a drive spring (44) disposed in the retainer (41). The two ends of the drive spring (44) abut against the first brake pad (421) and the bolt, respectively. In the initial state, the spring force of the drive spring (44) is zero, and the cylinder (43) drives the brake assembly (42) to move towards the proximal end. In the braking state, the drive spring (44) is activated, driving the brake assembly (42) to move towards the distal end until a set of brake pads are tightly attached.

6. The braking device for a servo press according to claim 2, characterized in that: A connecting shaft (12) passes through the end of the first brake pad (421) and is bolted to the retainer (41); a return spring (121) is provided on the connecting shaft (12); in the initial state, the return spring (121) drives the first brake pad (421) to move toward the retainer (41) until it is reset; in the braking state, the return spring (121) is compressed by force.

7. The braking device for a servo press according to claim 2, characterized in that: The diameter of the first brake pad (421) is larger than the diameter of the second brake pad (422).

8. The braking device for a servo press according to claim 2, characterized in that: The retainer (41) is provided with a tensioning structure, which is sleeved on the output shaft of the servo motor (2).

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