Hydraulic clamping device for a machine tool rotary table

Abstract

The utility model discloses a machine tool rotary table hydraulic clamping device relates to machine tool equipment technical field, the utility model discloses a fixed seat is provided with the placing plate at the top, the placing plate top is provided with the clamping mechanism, and the clamping mechanism inner chamber is provided with the engagement mechanism. In the utility model clamping mechanism, after the oil cylinder drive push rod moves to the clamping position, through the first motor drive screw rod rotation, make and move with the clamping plate of screw rod thread connection, and then drive the locking block and enter the locking groove on the push rod surface, and this mechanical locking structure combines with the push force of oil cylinder, forms double protection, effectively avoids the push rod loose problem caused by the pressure fluctuation or leakage of oil cylinder, ensures that work piece can be firmly clamped, greatly reduces the influence to machining accuracy and the risk of safety accident, and even under the cooperation of locking block and screw rod self -locking, even if in the processing vibration and other external force influence, locking effect is not easy to fail.

Description

Technical Field

[0001] This utility model belongs to the field of machine tool equipment technology, and in particular relates to a hydraulic clamping device for a machine tool turntable. Background Technology

[0002] Machine tool rotary tables are an indispensable component of modern machining equipment. They can drive workpieces to achieve multi-dimensional and multi-station rotational movements, thereby meeting the machining needs of complex parts and greatly expanding the machining range and capabilities of machine tools. During the operation of the machine tool rotary table, the clamping device plays a crucial role. It can firmly fix the workpiece on the rotary table and ensure that the workpiece will not be displaced by external forces during the machining process. It is the foundation for ensuring machining accuracy, improving production efficiency, and ensuring operational safety.

[0003] A patent with publication number CN220863784U discloses a high-pressure clamping hydraulic device for a rotary table, including a housing and a circular groove. The circular groove is formed on the housing, and a rotating device is installed on the housing. The rotating device includes a servo motor, a disc, a cross-shaped groove, and a clamping structure. The servo motor is installed inside the housing, and the disc is mounted on the output shaft of the servo motor. The disc is placed in the circular groove, the cross-shaped groove is formed on the disc, and the clamping structure is installed on the disc. There are four clamping structures, which are distributed in a ring at equal intervals on the disc. In this high-pressure clamping hydraulic device for a rotary table, the output end of the hydraulic cylinder drives the clamping plate to move inward. The clamping plate drives the vertical block to move inward along the cross-shaped groove, which can clamp external workpieces. The forces at the four corners act on the workpiece, resulting in a strong and stable clamping force. The output shaft of the servo motor drives the disc to rotate within the circular groove, preventing the workpiece from shaking during rotation processing.

[0004] Although the patent uses hydraulic cylinders on four sides to clamp the workpiece so that it does not wobble during rotation processing, it relies solely on the thrust of the cylinders to achieve clamping. When the cylinders experience pressure fluctuations or leaks, the push rods can easily loosen, resulting in the workpiece not being firmly clamped, affecting processing accuracy, and even causing safety accidents. Furthermore, since the clamping plates are fixed, a large-scale replacement is required when the fixture needs to be changed according to different workpieces.

[0005] To address these issues, we provide a hydraulic clamping device for machine tool rotary tables. Utility Model Content

[0006] The purpose of this utility model is to provide a hydraulic clamping device for machine tool turntables. By cooperating with the clamping mechanism and the locking mechanism, it solves the problems of insufficient stability of the clamping mechanism and difficulty in changing the fixture in the existing hydraulic clamping device for machine tool turntables.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0008] This utility model relates to a hydraulic clamping device for a machine tool rotary table, comprising a fixed base, a placement plate on the top of the fixed base, a clamping mechanism on the top of the placement plate, a locking mechanism within the clamping mechanism, and a hydraulic cylinder. The bottom of the hydraulic cylinder is fixedly connected to the placement plate, and a push rod is slidably connected to the inner cavity of the hydraulic cylinder. A locking groove is formed on the surface of the push rod, and a locking block is locked into the inner cavity of the locking groove. A clamping plate is fixedly connected to one side of the locking block, and the bottom of the clamping plate is slidably connected to the hydraulic cylinder. A lead screw is threadedly connected to the top of the clamping plate, and a first motor is fixedly connected to one side of the lead screw. The other side of the first motor is fixedly connected to the hydraulic cylinder, and a moving plate is fixedly connected to the other side of the push rod. Both sides of the moving plate are connected to the placement plate. The sliding plate is connected to a fixture, and the inner cavity of the movable plate is movably connected to the fixture. Both the locking block and the locking groove are wedge-shaped, which can achieve automatic alignment through the guiding effect of the inclined surface, reduce jamming, and make the locking action smoother. Under the action of external force, the locking block gradually enters the locking groove and the contact surface gradually increases, which makes the locking process more stable and avoids the problem of excessive local stress caused by the instantaneous contact area being too small. In addition, there are multiple locking grooves, which can be selected to cooperate with different locking grooves according to the actual clamping requirements. There are two clamping mechanisms, which are symmetrically distributed on both sides of the top of the placement plate, and can apply clamping force from both sides of the workpiece at the same time, making the workpiece more evenly stressed. The inner cavity of the fixture is equipped with a protective pad to prevent damage from hard contact between the fixture and the workpiece.

[0009] The present invention is further configured such that the engaging mechanism includes an insert block, one side of which is fixedly connected to the clamp, and the other side of which is engaged with a stop block. The other side of the stop block is slidably connected to a moving plate. A spring is provided on the rear side of the stop block, and the other side of the spring is fixedly connected to the moving plate. Two insert blocks are provided in a moving plate, and the two insert blocks are symmetrically distributed on both sides of the inner cavity of the moving plate. This allows symmetrical engaging forces to be formed from both sides of the clamp, making the connection between the clamp and the moving plate more stable and preventing the clamp from tilting or loosening due to force on one side.

[0010] The present invention is further configured such that guide rods are fixedly connected to both sides of the top of the placement plate, and the surface of the guide rods is slidably connected to the moving plate. There are two guide rods, which provide precise positioning and guidance for the moving plate.

[0011] The present invention is further configured such that a sliding rod is slidably connected to the bottom of the clamping plate, and both sides of the sliding rod are fixedly connected to the oil cylinder. The sliding rod can restrict the movement of the clamping plate and improve its stability during operation.

[0012] The present invention is further configured such that a push plate is slidably connected to the top of the movable plate, and the bottom of the push plate passes through the top of the movable plate and is fixedly connected to the abutment block. The operator can directly control the movement of the abutment block by sliding the push plate, and the engagement and disengagement of the insert block can be achieved without the aid of additional tools, which simplifies the operation steps of clamp replacement.

[0013] The present invention is further configured such that sliding grooves are provided on both sides of the inner cavity of the movable plate, and a slider is slidably connected to the inner cavity of the sliding groove. The other side of the slider is fixedly connected to the abutment. The arrangement of the sliding groove and the slider can limit the range of motion and operation mode of the abutment.

[0014] The present invention is further configured such that a second motor is fixedly connected to the inner cavity of the fixed base, the output end of the second motor is fixedly connected to the placement plate, the bottom of the placement plate is rotatably connected to the fixed base, and the second motor is used to drive the placement plate to rotate, thereby realizing the automated rotation of the workpiece.

[0015] The present invention is further configured such that a limiting groove is provided at the bottom of the placement plate, a limiting rod is slidably connected to the inner cavity of the limiting groove, and the bottom of the limiting rod is fixedly connected to the fixed seat. The limiting rod and the limiting groove can restrict the movement of the placement and improve its stability when rotating.

[0016] The present invention has the following beneficial effects.

[0017] 1. In the clamping mechanism of this utility model, after the hydraulic cylinder drives the push rod to move to the clamping position, the first motor drives the lead screw to rotate, causing the clamping plate threaded to the lead screw to move, thereby driving the locking block to engage in the locking groove on the surface of the push rod. This mechanical locking structure, combined with the thrust of the hydraulic cylinder, forms a double guarantee, effectively avoiding the problem of push rod loosening caused by pressure fluctuations or leakage in the hydraulic cylinder, ensuring that the workpiece can be firmly clamped, greatly reducing the impact on machining accuracy and the risk of safety accidents. With the self-locking cooperation of the locking block and the lead screw, even if it is affected by external forces such as vibration during the machining process, the locking effect is not easy to fail, and the push rod can be stably and reliably limited, further ensuring the stability of clamping.

[0018] 2. The locking mechanism of this utility model achieves the fixation of the clamp and the moving plate through the locking connection of the insert block and the abutment block, replacing the traditional bolt connection method. When replacing the clamp, there is no need to use tools to remove multiple bolts. Just apply external force to compress the spring of the abutment block and disengage it from the insert block, and the old clamp can be removed. When installing the new clamp, align the insert block with the installation position of the moving plate and insert it. The abutment block automatically locks into the insert block under the action of the spring force, and the fixation is completed. This greatly shortens the replacement time and improves the operation efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a perspective view of a hydraulic clamping device for a machine tool rotary table.

[0021] Figure 2 This is a perspective view of the clamping mechanism in a hydraulic clamping device for a machine tool rotary table.

[0022] Figure 3 This is an enlarged view of point A in a hydraulic clamping device for a machine tool rotary table.

[0023] Figure 4 This is a perspective view of the second motor in a hydraulic clamping device for a machine tool rotary table.

[0024] Figure 5 This is an enlarged view of point B in a hydraulic clamping device for a machine tool rotary table.

[0025] In the attached diagram: 1. Fixed base; 2. Placement plate; 3. Clamping mechanism; 301. Hydraulic cylinder; 302. Push rod; 303. Locking groove; 304. Locking block; 305. Clamping plate; 306. Lead screw; 307. First motor; 308. Moving plate; 309. Fixture; 4. Engaging mechanism; 401. Insertion block; 402. Abutment block; 403. Spring; 5. Guide rod; 6. Slide rod; 7. Push plate; 8. Slide groove; 9. Slider; 10. Second motor; 11. Limiting groove; 12. Limiting rod. Detailed Implementation

[0026] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1

[0028] Please see Figure 1-5This utility model relates to a hydraulic clamping device for a machine tool rotary table, comprising a fixed base 1, a placement plate 2 on the top of the fixed base 1, a clamping mechanism 3 on the top of the placement plate 2, a locking mechanism 4 within the inner cavity of the clamping mechanism 3, and a hydraulic cylinder 301. The bottom of the hydraulic cylinder 301 is fixedly connected to the placement plate 2, and a push rod 302 is slidably connected to the inner cavity of the hydraulic cylinder 301. A locking groove 303 is formed on the surface of the push rod 302, and a locking block 30 is engaged within the inner cavity of the locking groove 303. 4. A clamping plate 305 is fixedly connected to one side of the locking block 304. The bottom of the clamping plate 305 is slidably connected to the oil cylinder 301. A lead screw 306 is threadedly connected to the top of the clamping plate 305. A first motor 307 is fixedly connected to one side of the lead screw 306. The other side of the first motor 307 is fixedly connected to the oil cylinder 301. A moving plate 308 is fixedly connected to the other side of the push rod 302. Both sides of the moving plate 308 are slidably connected to the placement plate 2. A clamp 309 is movably connected to the inner cavity of the moving plate 308.

[0029] Specifically: Both the locking block 304 and the locking groove 303 are wedge-shaped, which can achieve automatic alignment through the guiding effect of the inclined surface, reduce jamming, and make the locking action smoother. Under the action of external force, the locking block 304 gradually enters the locking groove 303 and the contact surface gradually increases, which makes the locking process more stable and avoids the problem of excessive local stress due to the small instantaneous contact area. In addition, there are multiple locking grooves 303, which can be selected to cooperate with the locking block 304 according to the actual clamping requirements. There are two clamping mechanisms 3, which are symmetrically distributed on both sides of the top of the placement plate 2. They can apply clamping force from both sides of the workpiece at the same time, making the workpiece more evenly stressed. The inner cavity of the fixture 309 is provided with a protective pad to prevent the fixture 309 from being damaged by hard contact with the workpiece.

[0030] Example 2

[0031] Please see Figure 1-5Based on Embodiment 1, the engaging mechanism 4 includes an insert block 401, one side of which is fixedly connected to the clamp 309, and the other side of which is engaged with a stop block 402. The other side of the stop block 402 is slidably connected to the moving plate 308. A spring 403 is provided on the rear side of the stop block 402, and the other side of the spring 403 is fixedly connected to the moving plate 308. Guide rods 5 are fixedly connected to both sides of the top of the placement plate 2, and the surface of the guide rods 5 is slidably connected to the moving plate 308. A sliding rod 6 is slidably connected to the bottom of the clamping plate 305, and both sides of the sliding rod 6 are fixedly connected to the hydraulic cylinder 301. The moving plate 309... A push plate 7 is slidably connected to the top of the 08. The bottom of the push plate 7 passes through the top of the movable plate 308 and is fixedly connected to the abutment block 402. Slide grooves 8 are provided on both sides of the inner cavity of the movable plate 308. A slider 9 is slidably connected to the inner cavity of the slide groove 8. The other side of the slider 9 is fixedly connected to the abutment block 402. A second motor 10 is fixedly connected to the inner cavity of the fixed seat 1. The output end of the second motor 10 is fixedly connected to the placement plate 2. The bottom of the placement plate 2 is rotatably connected to the fixed seat 1. A limit groove 11 is provided at the bottom of the placement plate 2. A limit rod 12 is slidably connected to the inner cavity of the limit groove 11. The bottom of the limit rod 12 is fixedly connected to the fixed seat 1.

[0032] Specifically: A movable plate 308 has two insert blocks 401, which are symmetrically distributed on both sides of the inner cavity of the movable plate 308. They can form symmetrical locking forces from both sides of the clamp 309, making the connection between the clamp 309 and the movable plate 308 more stable and preventing the clamp 309 from tilting or loosening due to force on one side. There are two guide rods 5, which provide precise limit and guidance for the movable plate 308. The slide rod 6 can limit the movement of the clamp 305 and improve its stability during operation. The operator can directly control the movement of the abutment block 402 by sliding the push plate 7. The insertion and disengagement of the insert block 401 can be achieved without the need for additional tools, which simplifies the operation steps of changing the clamp 309. The setting of the slide groove 8 and the slider 9 can limit the range of motion and operation mode of the abutment block 402. The second motor 10 is used to drive the placement plate 2 to rotate, thereby realizing the automated rotation of the workpiece. The limiting rod 12 and the limiting groove 11 can limit the movement mode of the placement and improve its stability during rotation.

[0033] The working principle of this utility model is as follows: Pushing the push plate 7 causes the abutment 402 to move and compress the spring 403, disengaging it from the engagement with the insertion block 401. This allows the clamp 309 to be pulled out. Then, releasing the push plate 7 causes the spring 403 to extend and reset the abutment 402. Next, inserting the corresponding clamp 309 into the inner cavity of the moving plate 308 causes the abutment 402 to come into contact with the insertion block 401, being squeezed and moved, thus compressing the spring 403 again. When the insertion block 401 reaches the designated position, the spring 403 extends again, resetting the abutment 402 and engaging it with the insertion block 401. To facilitate the replacement of fixture 309 by staff for different workpieces, when in use, the workpiece is placed in the center of the placement plate 2, and the hydraulic cylinders 301 on both sides drive the push rod 302 to slide. The push rod 302 drives the moving plate 308 to move, and the moving plate 308 drives the fixture 309 to move and clamp the workpiece. After clamping is completed, the first motor 307 starts and drives the lead screw 306 to rotate. The lead screw 306 drives the clamping plates 305 on both sides to move inward at the same time. The clamping plates 305 drive the locking block 304 to enter the locking groove 303 on the push rod 302, thus completing the locking.

[0034] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A hydraulic clamping device for a machine tool rotary table, comprising a fixed base (1), characterized in that: The fixed base (1) is provided with a placement plate (2) on top, the placement plate (2) is provided with a clamping mechanism (3) on top, and the clamping mechanism (3) is provided with a locking mechanism (4) in its inner cavity; The clamping mechanism (3) includes a hydraulic cylinder (301). The bottom of the hydraulic cylinder (301) is fixedly connected to the placement plate (2). A push rod (302) is slidably connected to the inner cavity of the hydraulic cylinder (301). A locking groove (303) is provided on the surface of the push rod (302). A locking block (304) is engaged with the inner cavity of the locking groove (303). A clamping plate (305) is fixedly connected to one side of the locking block (304). The bottom of the clamping plate (305) is connected to the hydraulic cylinder (301). The clamping plate (305) is threadedly connected to a lead screw (306) at the top. A first motor (307) is fixedly connected to one side of the lead screw (306), and the other side of the first motor (307) is fixedly connected to a hydraulic cylinder (301). A moving plate (308) is fixedly connected to the other side of the push rod (302). Both sides of the moving plate (308) are slidably connected to the placement plate (2). A clamp (309) is movably connected to the inner cavity of the moving plate (308).

2. The hydraulic clamping device for a machine tool rotary table according to claim 1, characterized in that: The engaging mechanism (4) includes an insert block (401), one side of which is fixedly connected to a clamp (309), and the other side of which is engaged with a stop block (402). The other side of the stop block (402) is slidably connected to a moving plate (308). A spring (403) is provided on the rear side of the stop block (402), and the other side of the spring (403) is fixedly connected to the moving plate (308).

3. The hydraulic clamping device for a machine tool rotary table according to claim 1, characterized in that: Guide rods (5) are fixedly connected to both sides of the top of the placement plate (2), and the surface of the guide rods (5) is slidably connected to the moving plate (308).

4. The hydraulic clamping device for a machine tool rotary table according to claim 1, characterized in that: The bottom of the clamping plate (305) is slidably connected to a slide rod (6), and both sides of the slide rod (6) are fixedly connected to the oil cylinder (301).

5. A hydraulic clamping device for a machine tool rotary table according to claim 2, characterized in that: The top of the movable plate (308) is slidably connected to a push plate (7), and the bottom of the push plate (7) passes through the top of the movable plate (308) and is fixedly connected to the abutment block (402).

6. A hydraulic clamping device for a machine tool rotary table according to claim 2, characterized in that: The movable plate (308) has sliding grooves (8) on both sides of its inner cavity. A slider (9) is slidably connected to the inner cavity of the sliding groove (8). The other side of the slider (9) is fixedly connected to the abutment (402).

7. The hydraulic clamping device for a machine tool rotary table according to claim 1, characterized in that: The inner cavity of the fixed base (1) is fixedly connected to a second motor (10), the output end of the second motor (10) is fixedly connected to the placement plate (2), and the bottom of the placement plate (2) is rotatably connected to the fixed base (1).

8. The hydraulic clamping device for a machine tool rotary table according to claim 1, characterized in that: The bottom of the placement plate (2) has a limiting groove (11), and the inner cavity of the limiting groove (11) is slidably connected to a limiting rod (12). The bottom of the limiting rod (12) is fixedly connected to the fixing seat (1).

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