A support hydraulic cylinder

Abstract

The present application relates to a kind of support hydraulic cylinder, by changing the structure of ordinary hydraulic cylinder, upper sliding bearing, lower sliding bearing and outer shell are added on cylinder barrel, and outer shell is rigidly connected with piston rod by thread, so the rigidity of hydraulic cylinder is strengthened, thereby reducing the deformation of structural member.Simultaneously let upper sliding bearing, lower sliding bearing be main support, thereby the contact clearance of metal structural member at sealing ring is adjusted, even if the deformation of eccentric load, the contact of metal structural member at this place is not allowed, thereby the surface quality of sealing member contact surface is guaranteed, and the risk of sealing ring being abraded is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of mechanical transmission and hydraulic transmission, and relates to a design of a supporting hydraulic cylinder which can be widely applied to supporting and leveling in the fields of vehicles and working platforms. BACKGROUND

[0002] Vehicles and working platforms often need hydraulic cylinder supporting and leveling due to the need of work. Due to the deformation of vehicles and the inequality of the ground, the hydraulic cylinder is fixedly installed and will have a large deformation with the vehicle. Therefore, the hydraulic cylinder will not only bear the radial force along the direction of the piston rod, but also bear the lateral force perpendicular to the direction of the piston rod, Figure 1 is a schematic diagram of the installation of the hydraulic cylinder. The commonly used hydraulic cylinder mainly bears the radial load and cannot bear the lateral load. The lateral load often causes the wear and roughness of the sliding pair in contact, thereby causing the wear of the sealing element, the damage of the piston rod and the leakage of the hydraulic cylinder. Therefore, the ordinary hydraulic cylinder needs to be optimized.

[0003] At present, there are few studies on such a hydraulic cylinder. A vertical oil cylinder CN202811645U mainly introduces the composition structure of a vertical supporting hydraulic cylinder. A hydraulic cylinder for supporting CN106979187B introduces a vertical supporting hydraulic cylinder which controls the cooperation by changing the contact material to ensure that the lateral force does not damage the sealing element. SUMMARY

[0004] Technical problems to be solved

[0005] In order to avoid the shortcomings of the prior art, the present application provides a new supporting hydraulic cylinder which changes the structure of the hydraulic cylinder to ensure that the lateral force does not damage the sealing element.

[0006] Technical scheme

[0007] A supporting hydraulic cylinder comprises a tray, a front cylinder cover and a shaft head, a piston, a piston rod, a cylinder barrel, an oil port A, an oil port B, a rear cylinder cover and a center pipe, characterized in that an outer shell is added to the outside of the cylinder barrel, the outer shell is rigidly connected with the upper end of the piston rod by threads; the inside of the cylinder barrel and the piston rod slide with each other, and the outside of the cylinder barrel and the outer shell slide with each other; a sliding bearing is installed between the outer shell and the cylinder barrel, and the outer shell and the cylinder barrel can slide back and forth through the upper sliding bearing and the lower sliding bearing.

[0008] Two circular bosses are arranged on the outer shell close to the bottom, and the distance between the two bosses is the installation distance of the platform.

[0009] The upper sliding bearing is fixedly connected to the cylinder barrel, and the lower sliding bearing is fixedly connected to the outer shell.

[0010] A sealing ring is arranged between the piston and the cylinder barrel.

[0011] A sealing ring is provided between the rear end cover and the piston rod.

[0012] Beneficial effects

[0013] This invention provides a supporting hydraulic cylinder. By modifying the structure of a conventional hydraulic cylinder, an upper sliding bearing, a lower sliding bearing, and a housing are added to the cylinder barrel. The housing is then rigidly connected to the piston rod using threads. This strengthens the rigidity of the hydraulic cylinder, thereby reducing structural deformation. Furthermore, by using the upper and lower sliding bearings as the main support components, the contact gap between the metal components at the sealing ring is increased. Even under eccentric load deformation, contact between these metal components is prevented, ensuring the surface quality of the sealing surface and reducing the risk of seal wear. Attached Figure Description

[0014] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0015] Figure 1 Schematic diagram of the hydraulic cylinder support platform.

[0016] Figure 2 This hydraulic cylinder is intended to retract.

[0017] Figure 3 This is an indication of the hydraulic cylinder's extended extension.

[0018] 1-Plate, 2-Front cylinder head and shaft end, 3-Sealing ring, 4-Piston, 5-Piston rod, 6-Cylinder barrel, 7-Oil port A, 8-Oil port B, 9-Rear cylinder head, 10-Upper sliding bearing, 11-Center tube, 12-Outer shell, 13-Mounting surface, 14-Lower sliding bearing, 15-Platform, 16-Rod chamber, 17-Rodless chamber. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0020] The present application provides a reliable support hydraulic cylinder. The hydraulic cylinder can support vehicles and platforms, comprising a tray 1, a front cylinder cover and shaft head 2, a sealing ring 3, a piston 4, a piston rod 5, a cylinder barrel 6, an oil port A 7, an oil port B 8, a rear cylinder cover 9, an upper sliding bearing 10, a center tube 11, an outer shell 12 and a lower sliding bearing 14. The tray 1 is installed on the ground by screws, the front cylinder cover and shaft head 2 are fixed on the tray 1, the center tube 11 is located in the center of the cylinder barrel 6, the piston rod 5 is outside the center tube 11, the piston 4 is arranged between the piston rod 5 and the cylinder barrel 6, the inlet and outlet hydraulic oil ports A 7 and B 8 are arranged on the piston rod 5, and the piston rod 5 and the center tube 11 form a rod cavity and a rodless cavity of the hydraulic cylinder. The rear cylinder cover 9 is located at the upper end of the piston rod 5. The sealing ring 3 is arranged between the piston 4 and the piston rod 5, and the sealing ring 3 is arranged between the piston 4 and the cylinder barrel 6.

[0021] The piston 4 is connected together with the piston rod 5 through the upper check ring, and a sealing leak-proof structure is arranged in the middle. One end of the cylinder barrel 6 is provided with the front cylinder cover and shaft head 2, and the other end is provided with the rear cylinder cover 9, which are connected through threads and are provided with sealing rings to prevent leakage. The piston 4 can slide on the inner surface of the cylinder barrel 6. The piston rod 5 is connected to the outer shell 12 through a tail thread. The sliding bearing 10 is fixedly connected to the cylinder barrel 6, and the sliding bearing 14 is fixedly connected to the outer shell 12. The cylinder barrel 6 slides in the inner part of the outer shell 12 through the support of the sliding bearing 10 and the sliding bearing 14.

[0022] The center tube 11 is arranged in the piston rod 5 and connected to the rodless cavity of the hydraulic cylinder, and an oil port A 8 is arranged in the center, which is an inlet and outlet oil port of the rodless cavity. At the same time, an oil port B 7 is arranged at the end face of the piston rod 5, which is connected to the rod cavity of the hydraulic cylinder through the internal structure and is an inlet and outlet oil port of the rod cavity.

[0023] Reference Figure 1 , Figure 2 and Figure 3 The specific embodiments of the hydraulic cylinder are described in detail.

[0024] The hydraulic cylinder is fixed on the vehicle and platform 14 through the mounting surface 13 on the outer shell 12. The mounting surface is provided with two circular bosses near the bottom of the outer shell 12, and the distance between the two bosses is the mounting distance of the platform. The oil port A 7 of the hydraulic cylinder is supplied with pressure oil, and the front cylinder cover and shaft head 2, the tray 1 and the cylinder barrel 6 move downward together until the tray 1 touches the ground, and then continue to move to change the height of the corresponding position platform, so that the vehicle and platform can be leveled by adjusting the extension length of the piston rod of each support hydraulic cylinder. Similarly, the oil port B 8 of the hydraulic cylinder is supplied with pressure oil, and the front cylinder cover and shaft head 2, the tray 1 and the cylinder barrel 6 move upward until they are completely retracted.

[0025] The biggest difficulty of the supporting hydraulic cylinder is to bear large lateral force, the ordinary hydraulic cylinder cannot bear lateral force, and long time operation under the action of lateral force can cause serious wear of sliding pair and sealing ring. The supporting hydraulic cylinder is innovative in that the structure of the ordinary hydraulic cylinder is changed and the rigidity of the hydraulic cylinder is strengthened, so that the deformation of the structural member is reduced. Meanwhile, the contact gap of the structural member at the sealing ring is increased, so that the structural member at the sealing ring is not contacted, the surface quality of the sealing member contact surface is ensured, and the risk of wear of the sealing ring is reduced. The specific design is as follows:

[0026] 1) The upper sliding bearing 10, the lower sliding bearing 14 and the outer shell 12 are added to the cylinder barrel 6, and the outer shell 12 is rigidly connected with the piston rod 5 by threads. When the hydraulic cylinder moves, the outer shell 12 and the cylinder barrel 6 can slide back and forth through the upper sliding bearing 10 and the lower sliding bearing 14.

[0027] 2) The outer shell 12 is fixed through the mounting surface 13, and the cylinder barrel 6 can stretch and contract back and forth when the hydraulic cylinder moves.

[0028] 3) The inside of the cylinder barrel 6 slides with the piston rod 5, and the outside slides with the outer shell 12. Therefore, the minimum supporting diameter of the hydraulic cylinder is changed from the piston rod 5 to the cylinder barrel 6, the supporting diameter of the hydraulic cylinder is increased, and the rigidity of the support is increased.

[0029] 4) The upper sliding bearing 10 and the lower sliding bearing 14 between the outer shell 12 and the cylinder barrel 6 are controlled as the main positions to bear lateral force through the matching gap. The sliding gap between the piston 4 and the cylinder barrel 6 is set to be larger than the deformation of the cylinder barrel 6 under the action of the lateral force, so that the piston 4 is not contacted with the cylinder barrel 6, the surface quality of the sealing member contact surface is ensured, and the risk of wear of the sealing ring is reduced. Similarly, the sliding gap between the rear end cover 9 and the piston rod 5 is set to be larger than the deformation of the cylinder barrel 6, so that the rear end cover 9 is not contacted with the piston rod 5, the surface quality of the sealing member contact surface is ensured, and the risk of wear of the sealing ring is reduced.

[0030] 5) Since the outer shell 12 is added, the hydraulic cylinder is installed by fixing the outer shell 12 through the mounting surface 13. The inlet and outlet hydraulic oil ports A and B are arranged on the piston rod 5, and the rod cavity and the rodless cavity of the hydraulic cylinder are communicated through the internal structure of the piston rod 5 and the center pipe 11.

[0031] 6) The supporting hydraulic cylinder is supported by the cylinder barrel 6, so the front cylinder cover and the shaft head 2 and the tray 1 are arranged at the end of the cylinder barrel 6, so that the hydraulic cylinder can adapt to the uneven bottom surface.

[0032] The supporting hydraulic cylinder has been applied to support vehicles and platforms, and the application shows that the device meets the use requirements, the structure is reasonable, can be applied to other military and civilian product fields, and has good popularization and application prospect.

[0033] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A supporting hydraulic cylinder capable of supporting vehicles and platforms, characterized in that... Includes a tray (1), front cylinder head and shaft end (2), sealing ring (3), piston (4), piston rod (5), cylinder (6), oil port A (8), oil port B (7), rear cylinder head (9), upper sliding bearing (10), center tube (11), outer casing (12), and lower sliding bearing (14); the tray (1) is mounted on the ground with screws, the front cylinder head and shaft end (2) are fixed to the tray (1), the center tube (11) is located at the center of the cylinder (6), and the center tube ( 11) The outer side is the piston rod (5), and the piston (4) is provided between the piston rod (5) and the cylinder (6). The oil port A (8) and oil port B (7) are both located on the piston rod (5). The rod chamber and rodless chamber of the hydraulic cylinder are formed by the internal structure of the piston rod (5) and the central tube (11); the rear cylinder cover (9) is located at the upper end of the piston rod (5); a sealing ring (3) is provided between the piston (4) and the piston rod (5), and a sealing ring (3) is provided between the piston (4) and the cylinder (6); The piston (4) is connected to the piston rod (5) by the upper retaining ring, and a seal is provided in the middle to prevent leakage; one end of the cylinder (6) is provided with a front cylinder head and a shaft head (2), and the other end is provided with a rear cylinder head (9), all of which are connected by threads and are equipped with seals to prevent leakage; the piston (4) can slide on the inner surface of the cylinder (6); the piston rod (5) is connected to the outer shell (12) by the tail thread; the upper sliding bearing (10) is fixedly connected to the cylinder (6), and the lower sliding bearing (14) is fixedly connected to the outer shell (12); the cylinder (6) slides inside the outer shell (12) with the support of the upper sliding bearing (10) and the lower sliding bearing (14); The piston rod (5) has a central tube (11) installed inside, which is connected to the rodless chamber of the hydraulic cylinder. The center has an oil port A (8), which is the oil inlet and outlet of the rodless chamber. At the same time, the piston rod (5) also has an oil port B (7) on its end face, which is connected to the rod chamber of the hydraulic cylinder through the internal structure, and is the oil inlet and outlet of the rod chamber. The hydraulic cylinder is fixed to the vehicle and platform via the mounting surface (13) on the outer shell (12). The mounting surface is provided with two circular protrusions near the bottom of the outer shell (12), and the distance between the two protrusions is the installation distance of the platform. When hydraulic oil is applied to the oil port A (8) of the hydraulic cylinder, the front cylinder head, shaft head (2), tray (1), and cylinder (6) move downward together until the tray (1) touches the ground, and then continue to move to change the height of the platform at the corresponding position. Adjusting the extension length of the piston rod of each support hydraulic cylinder of the platform can level the vehicle and platform. Similarly, when hydraulic oil is applied to the oil port B (7) of the hydraulic cylinder, the front cylinder head, shaft head (2), tray (1), and cylinder (6) move upward until they are completely retracted.

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