Composite lifting inner clamping cylinder

Abstract

The application discloses a composite lifting inner clamping cylinder and belongs to the technical field of cylinders. The composite lifting inner clamping cylinder comprises a first cylinder, a second cylinder fixedly installed at the first piston rod end of the first cylinder, a chuck arranged at the second piston rod end of the second cylinder, a guide ring fixedly arranged on the first cylinder, a guide groove arranged on the surface of the first piston rod and an anti-rotation block fixedly arranged on the guide ring, and lubricating structures are arranged on the guide ring and the anti-rotation block. The lubricating structures comprise an oil storage cavity fixedly arranged in the guide ring and a rolling assembly arranged on the anti-rotation block. The composite lifting inner clamping cylinder provides lubricating medium through the oil storage cavity, and the rolling assembly is used for transmitting lubricating oil to the surface of the guide groove to form an oil film, so that the rigid contact and friction between the anti-rotation block and the guide groove are reduced, and the abrasion between the anti-rotation block and the guide groove is reduced.

Description

Technical Field

[0001] This application relates to the field of cylinder technology, specifically a composite lifting and internal clamping cylinder. Background Technology

[0002] With the continuous development of industrial automation, various cylinders, as key actuators in automated equipment, directly affect production efficiency and product quality in terms of performance and reliability. In the field of non-standard automation, the structural design of cylinders is also showing a diversified trend to meet different working conditions. Among them, compound cylinders are widely used because they can integrate multiple functions.

[0003] Chinese utility model patent CN213116908U discloses a composite lifting internal clamping cylinder. It employs a dual-cylinder composite design, allowing for adjustable range. To ensure cylinder operational stability, anti-rotation holes on the guide ring prevent circumferential rotation of the first guide post. However, in actual use, the anti-rotation hole and the first guide post are in rigid contact. As the first guide post frequently slides axially within the anti-rotation hole, the contact surface gradually wears down due to continuous friction. Long-term wear not only reduces the structural precision of the anti-rotation hole or the first guide post but also affects the smoothness of the first guide post's axial sliding, thereby reducing the overall accuracy and service life of the composite lifting internal clamping cylinder.

[0004] Therefore, this application provides a composite lifting internal clamping cylinder to solve the above problems. Utility Model Content

[0005] This application provides a composite lifting internal clamping cylinder, which aims to solve the problems mentioned in the background art, such as the rigid contact between the anti-rotation hole and the first guide post of the existing composite lifting internal clamping cylinder, which will wear due to continuous friction under frequent axial sliding, thereby reducing the cylinder's accuracy and service life.

[0006] To achieve the above objectives, this application provides the following technical solution: a composite lifting internal clamping cylinder, comprising a first cylinder, a second cylinder fixedly installed at the end of a first piston rod of the first cylinder, a chuck disposed at the end of a second piston rod of the second cylinder, a guide ring fixedly disposed on the first cylinder for the first piston rod to pass through, a guide groove disposed on the surface of the first piston rod, and an anti-rotation block fixedly disposed on the guide ring for contacting the guide groove, wherein the guide ring and the anti-rotation block are provided with lubrication structures for lubricating the anti-rotation block and the guide groove;

[0007] The lubrication structure includes an oil reservoir fixedly disposed within the guide ring for storing lubricating oil, and a rolling assembly disposed on the anti-rotation block for rollingly transferring the lubricating oil in the oil reservoir to the surface of the guide groove. The lubricating medium is provided through the oil reservoir, and the rolling assembly rolls the lubricating oil in the oil reservoir to the surface of the guide groove, forming a lubricating oil film on the contact surface between the anti-rotation block and the guide groove. This oil film can reduce the direct rigid contact between the anti-rotation block and the guide groove, reduce the friction between them, thereby effectively reducing wear caused by frequent friction and extending the service life of the anti-rotation block and the guide groove.

[0008] Preferably, to achieve the clamping function, the chuck includes fixed seats symmetrically arranged on both sides of the second piston rod and fixedly connected to the outside of the second cylinder, jaws respectively hinged to the two fixed seats, and a connecting plate fixedly installed at the end of the second piston rod. The two ends of the jaws are respectively hinged to the sides of the two jaws that are close to each other. The axial movement of the second piston rod drives the connecting plate to move, and the connecting plate can push the jaws to rotate around the hinge point, so that the two jaws move closer or further apart, thereby realizing the clamping or releasing operation of the workpiece. It can adapt to workpieces of various complex shapes and sizes, and improves the versatility and flexibility of the cylinder.

[0009] Preferably, to prevent the first piston rod from rotating circumferentially, the anti-rotation block includes a contact portion that contacts the surface of the guide groove and limiting portions symmetrically arranged on both sides of the contact portion for limiting and turning the edge of the guide groove. The contact portion contacts the surface of the guide groove, which can initially limit the rotation of the first piston rod through friction. The limiting portions symmetrically arranged on both sides of the contact portion limit and turn the edge of the guide groove. When the first piston rod has a tendency to rotate circumferentially, the limiting portions block the edge of the guide groove from both sides, and together with the contact portion, they form a double anti-rotation mechanism, which effectively prevents the first piston rod from rotating, thereby greatly improving the effect of preventing the first piston rod from rotating circumferentially.

[0010] Preferably, in order to transfer the lubricating oil in the oil reservoir to the surface of the guide groove and reduce the friction and wear between the anti-rotation block and the guide groove, the rolling assembly includes balls rotatably disposed at the contact portion and distributed in a rectangular array, and a through groove fixedly disposed in the contact portion at the position corresponding to the balls for communicating with the oil reservoir. The rectangular array of balls can convert the sliding friction between the contact portion and the guide groove into rolling friction, while the through groove can guide the lubricating oil in the oil reservoir to the surface of the balls, and evenly coat the surface of the guide groove with the rolling of the balls to form a lubricating oil film, so that the lubricating oil can be accurately replenished through the through groove, reducing wear.

[0011] Preferably, to facilitate the replenishment of lubricating oil into the oil reservoir, the guide ring is provided with an oil injection hole communicating with the oil reservoir, and a sealing plug is inserted into the port of the oil injection hole away from the oil reservoir. The combination design of the oil injection hole and the sealing plug allows lubricating oil to be added to the oil reservoir through the oil injection hole, and the port is sealed with the sealing plug after replenishment to isolate external dust and prevent lubricating oil from overflowing, making lubricating oil replenishment and maintenance more convenient and quick, so as to ensure the normal operation of the lubrication system.

[0012] Preferably, to prevent lubricating oil from entering the first cylinder, a sealing ring is fixedly provided on the side of the guide ring near the inside of the first cylinder. When the first cylinder is running, the sealing ring can tightly fit against the contact surface between the guide ring and the first cylinder, forming a sealing barrier. Its elasticity and sealing performance prevent lubricating oil from seeping into the inside of the first cylinder from the gap between the two, thereby avoiding contamination and damage to the internal parts of the first cylinder by lubricating oil and ensuring the normal operation of the first cylinder.

[0013] The composite lifting internal clamping cylinder provides lubricating medium through the oil storage chamber, and then uses the rolling component to roll the lubricating oil in the oil storage chamber to the surface of the guide groove, forming a lubricating oil film on the contact surface between the anti-rotation block and the guide groove. This oil film can reduce the direct rigid contact between the anti-rotation block and the guide groove, reduce the friction between the two, thereby effectively reducing wear caused by frequent friction, extending the service life of the anti-rotation block and the guide groove, and ensuring the accuracy of the entire composite lifting internal clamping cylinder.

[0014] This composite lifting internal clamping cylinder, through the combination design of an oil injection hole and a sealing plug, allows lubricating oil to be added to the oil storage chamber through the oil injection hole. After replenishment, the port is sealed with a sealing plug to isolate external dust and prevent lubricating oil from overflowing, making lubricating oil replenishment and maintenance more convenient and quick, thus ensuring the normal operation of the lubrication system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a composite lifting and clamping cylinder.

[0016] Figure 2 A cross-sectional view of the first cylinder in a composite lifting and clamping cylinder.

[0017] Figure 3 A schematic diagram of the anti-rotation block in a composite lifting internal clamping cylinder;

[0018] Figure 4 This is a schematic diagram of the lubrication structure in a composite lifting internal clamping cylinder.

[0019] In the picture:

[0020] 1. First cylinder; 11. First piston rod;

[0021] 2. Second cylinder; 21. Second piston rod;

[0022] 3. Chuck; 31. Mounting base; 32. Claw; 33. Connecting plate;

[0023] 4. Guide ring; 41. Oil injection hole; 42. Sealing plug; 43. Sealing ring;

[0024] 5. Anti-rotation block; 51. Contact part; 52. Limiting part;

[0025] 6. Guide groove;

[0026] 7. Lubrication structure; 71. Oil reservoir; 72. Rolling assembly; 721. Ball bearing; 722. Through groove. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] This embodiment provides a composite lifting internal clamping cylinder, such as Figures 1-4 As shown, the composite lifting internal clamping cylinder includes a first cylinder 1, a second cylinder 2 fixedly installed at the end of the first piston rod 11 of the first cylinder 1, a chuck 3 disposed at the end of the second piston rod 21 of the second cylinder 2, a guide ring 4 fixedly disposed on the first cylinder 1 for the first piston rod 11 to pass through, a guide groove 6 disposed on the surface of the first piston rod 11, and an anti-rotation block 5 fixedly disposed on the guide ring 4 for contacting the guide groove 6. The guide ring 4 and the anti-rotation block 5 are provided with a lubrication structure 7 for lubricating the anti-rotation block 5 and the guide groove 6. The lubrication structure 7 includes an oil storage cavity 71 fixedly disposed in the guide ring 4 for storing lubricating oil and a rolling assembly 72 disposed on the anti-rotation block 5 for rollingly transferring the lubricating oil in the oil storage cavity 71 to the surface of the guide groove 6.

[0029] It should be added that the first cylinder 1 is provided with a first cylinder body, a first piston chamber and a first piston slidably connected in the first piston chamber. The first piston rod 11 is fixedly connected to the first piston. When the air supply path is switched, the air pressure difference on both sides of the first piston chamber drives the first piston to move axially, thereby driving the first piston rod 11 to extend and retract, realizing the position adjustment of the second cylinder 2. The second cylinder 2 is provided with a second cylinder body, a second piston chamber and a second piston slidably connected in the second piston chamber. The second piston rod 21 is fixedly connected to the second piston. After the air supply path is switched, the air pressure difference on both sides of the second piston chamber drives the second piston to move axially, thereby driving the second piston rod 21 to extend and retract.

[0030] In use, the air supply path of the first cylinder 1 is switched first, causing the first piston rod 11 to move axially under air pressure. Since the first piston rod 11 passes through the guide ring 4, the guide ring 4 can guide the movement of the first piston rod 11 to ensure smooth movement. At the same time, the anti-rotation block 5 is fixed on the guide ring 4 and contacts the guide groove 6 on the surface of the first piston rod 11, which can prevent the first piston rod 11 from rotating circumferentially. Since the rolling assembly 72 is set on the anti-rotation block 5, during the extension and retraction of the first piston rod 11 in the first cylinder 1, the guide groove 6 extends and retracts synchronously with the extension and retraction of the first piston rod 11 and contacts the rolling assembly 72 set on the anti-rotation block 5. The rolling assembly 72 pushes the guide ring 4... The lubricating oil pre-stored in the oil storage chamber 71 is rolled and transferred to the surface of the guide groove 6, forming a lubricating oil film on the contact surface between the anti-rotation block 5 and the guide groove 6. This reduces the friction between the anti-rotation block 5 and the guide groove 6 when they move relative to each other, extending the service life of the anti-rotation block 5 and the guide groove 6 and ensuring the accuracy of the entire composite lifting internal clamping cylinder. After the first piston rod 11 pushes the second cylinder 2 to the designated position, the air supply path to the second cylinder 2 is switched, so that the second piston rod 21 is driven by air pressure to perform axial extension and retraction. Through the extension and retraction of the second piston rod 21, the clamping or releasing action of the workpiece can be realized. In addition, lubricating oil can be pre-stored in the oil storage chamber 71 during use.

[0031] Specifically, the chuck 3 includes a fixed seat 31 symmetrically arranged on both sides of the second piston rod 21 and fixedly connected to the outside of the second cylinder 2, a pawl 32 respectively hinged to the two fixed seats 31, and a connecting plate 33 fixedly installed at the end of the second piston rod 21. The two ends of the pawl 32 are respectively hinged to the side of the two pawls 32 that are close to each other.

[0032] When the second cylinder 2 is working, the second piston rod 21 moves axially and retracts. The connecting plate 33, which is fixedly installed at the end of the second piston rod 21, moves synchronously. Since the pawls 32 are hinged on the fixed seats 31 that are symmetrically arranged on both sides of the second piston rod 21 and fixedly connected to the outside of the second cylinder 2, and the two ends of the pawls 32 are respectively hinged to the side of the two pawls 32 that are close to each other, when the connecting plate 33 moves with the second piston rod 21, the connecting plate 33 will push the pawls 32, causing the pawls 32 to rotate around the hinge point on the fixed seat 31, so that the two pawls 32 move closer or further apart, thereby realizing the clamping or loosening action of the workpiece.

[0033] To prevent the first piston rod 11 from rotating circumferentially, the anti-rotation block 5 includes a contact portion 51 that contacts the surface of the guide groove 6 and limiting portions 52 symmetrically arranged on both sides of the contact portion 51 for limiting and turning the edge of the guide groove 6. The contact portion 51 contacts the surface of the guide groove 6 and can initially limit the rotation of the first piston rod 11 through friction. The limiting portions 52 symmetrically arranged on both sides of the contact portion 51 limit and turn the edge of the guide groove 6. When the first piston rod 11 has a tendency to rotate circumferentially, the limiting portions 52 block the edge of the guide groove 6 from both sides. Together with the contact portion 51, they form a double anti-rotation mechanism, which effectively prevents the first piston rod 11 from rotating, thereby greatly improving the effect of preventing the first piston rod 11 from rotating circumferentially.

[0034] Furthermore, the rolling assembly 72 includes balls 721 rotatably disposed at the contact portion 51 and distributed in a rectangular array, and a through groove 722 fixedly disposed in the contact portion 51 at the position corresponding to the balls 721 for communicating with the oil storage chamber 71.

[0035] During the extension and retraction of the first piston rod 11 of the first cylinder 1, the contact portion 51 of the anti-rotation block 5 contacts and moves relative to the guide groove 6 on the surface of the first piston rod 11. At this time, the balls 721, which are rotatably arranged at the contact portion 51 and distributed in a rectangular array, will roll with the relative movement. Since a through groove 722 communicating with the oil storage chamber 71 is fixedly provided in the contact portion 51 at the position corresponding to the ball 721, the lubricating oil in the oil storage chamber 71 will seep out through the through groove 722 and adhere to the surface of the ball 721. As the ball 721 rolls, the lubricating oil is evenly transferred to the surface of the guide groove 6, forming a lubricating oil film between the contact portion 51 and the guide groove 6, thereby reducing the friction between the two, extending the service life of the anti-rotation block 5 and the guide groove 6, and ensuring the accuracy of the entire composite lifting internal clamping cylinder.

[0036] It should be noted that the spherical surface of the exposed part of the ball 721 abuts against the groove wall of the guide groove 6, and the volume embedded in the through groove 722 is larger than its exposed volume, so that the ball 721 can rotate freely with the axial movement of the first piston rod 11.

[0037] Furthermore, an oil injection hole 41 communicating with the oil storage chamber 71 is provided on the guide ring 4, and a sealing plug 42 is inserted into the port of the oil injection hole 41 away from the oil storage chamber 71.

[0038] First, remove the sealing plug 42 from the oil injection hole 41 on the guide ring 4, away from the port of the oil storage chamber 71, so that the oil injection hole 41 is unobstructed. Then, inject an appropriate amount of lubricating oil into the oil storage chamber 71 connected to it through the oil injection hole 41. After the lubricating oil is added, reinsert the sealing plug 42 into the port of the oil injection hole 41 to seal the oil injection hole 41 and prevent the lubricating oil in the oil storage chamber 71 from leaking. This allows for the periodic replenishment of lubricating oil to the oil storage chamber 71 in the guide ring 4, ensuring that the subsequent lubrication structure 7 can normally provide lubrication for the anti-rotation block 5 and the guide groove 6.

[0039] In addition, to prevent lubricating oil from entering the first cylinder 1, a sealing ring 43 is fixedly installed on the side of the guide ring 4 near the inside of the first cylinder 1. When the first cylinder 1 is running, the sealing ring 43 can fit tightly against the contact surface between the guide ring 4 and the first cylinder 1 to form a sealing barrier. Its elasticity and sealing performance prevent lubricating oil from seeping into the inside of the first cylinder 1 from the gap between the two, thereby avoiding the lubricating oil from contaminating and damaging the internal parts of the first cylinder 1 and ensuring the normal operation of the first cylinder 1.

[0040] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A composite lifting internal clamping cylinder, comprising a first cylinder (1), a second cylinder (2) fixedly mounted on the end of a first piston rod (11) of the first cylinder (1), a chuck (3) disposed on the end of a second piston rod (21) of the second cylinder (2), a guide ring (4) fixedly disposed on the first cylinder (1) for the first piston rod (11) to pass through, a guide groove (6) disposed on the surface of the first piston rod (11), and an anti-rotation block (5) fixedly disposed on the guide ring (4) for contacting the guide groove (6), characterized in that: The guide ring (4) and the anti-rotation block (5) are provided with a lubrication structure (7) for lubricating the anti-rotation block (5) and the guide groove (6); The lubrication structure (7) includes an oil reservoir (71) fixedly disposed in the guide ring (4) for storing lubricating oil and a rolling assembly (72) disposed on the anti-rotation block (5) for rolling the lubricating oil in the oil reservoir (71) to the surface of the guide groove (6).

2. The composite lifting inner clamping cylinder according to claim 1, characterized in that: The chuck (3) includes a fixed seat (31) symmetrically arranged on both sides of the second piston rod (21) and fixedly connected to the outside of the second cylinder (2), a pawl (32) respectively hinged to the two fixed seats (31), and a connecting plate (33) fixedly installed at the end of the second piston rod (21). The two ends of the pawl (32) are respectively hinged to the side of the two pawls (32) that are close to each other.

3. The composite lifting inner clamping cylinder according to claim 1, characterized in that: The anti-rotation block (5) includes a contact part (51) that contacts the surface of the guide groove (6) and a limiting part (52) symmetrically arranged on both sides of the contact part (51) for limiting and turning the edge of the guide groove (6).

4. The composite lifting inner clamping cylinder according to claim 3, characterized in that: The rolling assembly (72) includes balls (721) rotatably disposed at the contact portion (51) and arranged in a rectangular array, and a through groove (722) fixedly disposed in the contact portion (51) at the position corresponding to the balls (721) for communicating with the oil storage chamber (71).

5. The composite lifting inner clamping cylinder according to claim 4, characterized in that: The guide ring (4) has an oil injection hole (41) that communicates with the oil storage cavity (71), and a sealing plug (42) is inserted into the port of the oil injection hole (41) away from the oil storage cavity (71).

6. The composite lifting inner clamping cylinder according to claim 5, characterized in that: A sealing ring (43) is fixedly provided on the side of the guide ring (4) near the inside of the first cylinder (1).

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