Loading hydraulic cylinder device with floatable position

Abstract

The utility model provides a loading hydraulic cylinder device with a floatable position. The loading hydraulic cylinder device comprises a piston and a cylinder barrel, wherein the piston is fixed with a roller core above the piston; the cylinder barrel comprises a cylinder body and a cylinder bottom cover fixed to a shoe plate below the cylinder body. The cylinder body comprises a side wall and a bottom plate which are integrally arranged; the piston is arranged on the inner surface of the side wall of the cylinder body in an up-down sliding mode. A middle hole is formed in the center of the bottom plate, the lower end of the cylinder bottom cover is arranged in the middle hole, and the upper end of the cylinder bottom cover is pressed above the bottom plate of the cylinder body and is in sliding connection with the bottom plate of the cylinder body; the bottom of the cylinder body is connected with the shoe plate in a sliding mode. The cylinder body can float on the bottom surface of the shoe plate, so that the shoe plate can be finely adjusted relative to the back roller, the shoe plate can be better attached to the back roller below the shoe plate, a pressing area is wider, and stable pressing area width and linear pressure are kept. The device is simple in structure and convenient to install and maintain.

Description

Technical Field

[0001] The press shoe is a key component in papermaking machinery, and an important piece of equipment in modern high-speed paper machines for pressing wet paper sheets. The concave design on the press shoe increases the width of the press zone, allowing the wet paper sheet to dewater for a longer period, thus improving pressing efficiency. At the same time, the linear pressure between the press shoe and the back rolls needs to be precisely controlled to ensure uniform pressure distribution during the pressing process and to prevent problems such as paper breakage or indentations.

[0002] The existing system uses a loading hydraulic cylinder between the boot core and the boot plate. The upper boot core is fixedly connected to the piston, and the lower boot plate is fixedly connected to the cylinder. The boot plate is subjected to significant forces and may deflect. The fixed position of the hydraulic cylinder leads to instability in the loading force applied to the boot plate. Patent CN209781339U discloses a unidirectional loading hydraulic cylinder for boot rollers, including an upper cover, a piston, and a cylinder. This structure ensures that even when the boot plate deflects and becomes non-parallel to the cylinder bottom plate, the high-pressure oil seal of the hydraulic cylinder continues to operate normally, thus guaranteeing the stability of the loading force applied to the boot plate. However, in actual operation, the boot plate may not fully fit against the upper and lower rollers, shortening the pressing zone and affecting the pressing effect. Summary of the Invention

[0003] This invention provides a loading hydraulic cylinder device with a floating position.

[0004] The purpose of this utility model is achieved in the following manner: a floating loading hydraulic cylinder device, including a piston fixed to an upper roller core and a cylinder barrel; the cylinder barrel includes a cylinder body and a cylinder bottom cover fixed to a lower shoe plate; the cylinder body includes an integrally formed side wall and a bottom plate; the piston is slidably disposed on the inner surface of the side wall of the cylinder body; the bottom plate has a central hole, the lower end of the cylinder bottom cover is disposed in the central hole, the upper end of the cylinder bottom cover presses on the bottom plate of the cylinder body and is slidably connected to the bottom plate of the cylinder body; the bottom of the cylinder body is slidably connected to the shoe plate.

[0005] The diameter of the upper end of the cylinder bottom cover is larger than the diameter of the lower end; the lower surface of the upper end of the cylinder bottom cover is fitted with a clearance fit to the upper surface of the bottom plate of the cylinder body.

[0006] The distance between the lower surface of the upper end of the cylinder bottom cover and the upper surface of the bottom plate of the cylinder body is no more than 0.5 mm.

[0007] A sealing structure is provided between the lower surface of the cylinder block and the boot plate; a through hole is provided on the cylinder bottom cover as an oil inlet.

[0008] A sealing structure is provided between the outer surface of the piston and the inner surface of the cylinder sidewall; a sealing structure is provided at the contact surface between the piston and the roller core.

[0009] A row of loading hydraulic cylinders is arranged side by side between the roller core and the boot plate.

[0010] Compared to existing technologies, the floating hydraulic cylinder device, when operating, can absorb some of the impact force when the shoe pressing plate is subjected to the reaction force from the back roller, etc. Furthermore, because the cylinder body can float on the bottom surface of the shoe plate, the shoe pressing plate can be finely adjusted relative to the back roller, resulting in better contact between the shoe plate and the lower back roller, a wider pressing area, and thus maintaining a stable pressing zone width and linear pressure. This invention has a simple structure and is easy to install and maintain. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the loading hydraulic cylinder structure of this utility model.

[0012] Figure 2 This is a schematic diagram of a row of hydraulic cylinders between the roller core and the shoe plate.

[0013] Figure 3 This is a schematic diagram of the exhaust component.

[0014] Figure 4 This is a schematic diagram of the exhaust component body being mounted on the piston.

[0015] Among them, 1 is the roller core, 2 is the shoe plate, 3 is the piston, 30 is the center hole, 4 is the cylinder body, 40 is the intermediate hole, 5 is the cylinder bottom cover, 50 is the oil inlet, 6 is the exhaust component body, 60 is the small hole, 61 is the conical hole, 62 is the cylindrical hole, 63 is the slot, 64 is the mounting end, 7 is the exhaust channel, 8 is the Glyd ring, and 9 is the oil seal. Detailed Implementation

[0016] In this utility model, unless otherwise expressly specified and limited, the technical terms used in this application shall have the ordinary meaning understood by those skilled in the art. Terms such as "connected," "linked," "fixed," and "set" shall be interpreted broadly, referring to fixed connections, detachable connections, or integral connections; direct connections or indirect connections via an intermediate medium; mechanical connections or electrical connections. Unless otherwise expressly specified and limited, "above" or "below" a second feature may mean that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," or "over" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "under" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Relational terms such as "first," "second," etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms used in the description, such as “center,” “lateral,” “longitudinal,” “length,” “width,” “thickness,” “height,” “front,” “rear,” “left,” “right,” “up,” “down,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” “circumferential,” “clockwise,” and “counterclockwise,” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0017] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Figure 1-4As shown, a floating loading hydraulic cylinder device includes a piston 3 fixed to an upper roller core 1 and a cylinder barrel; the cylinder barrel includes a cylinder body 4 and a cylinder bottom cover 5 fixed to a lower shoe plate 2; the cylinder body 4 includes an integrally formed side wall and a bottom plate; the piston 3 is slidably disposed on the inner surface of the side wall of the cylinder body 4; a central hole 40 is provided in the center of the bottom plate, the lower end of the cylinder bottom cover 5 is disposed in the central hole 40, the upper end of the cylinder bottom cover 5 presses against the bottom plate of the cylinder body 4 and is slidably connected to the bottom plate of the cylinder body 4; the bottom of the cylinder body 4 is slidably connected to the shoe plate 2. In this invention, the shoe plate 2, together with the cylinder bottom cover 5 mounted on it, can slide horizontally with the cylinder body 4, thereby achieving fine-tuning and self-adaptation in the horizontal direction. When a row of loading hydraulic cylinders is installed simultaneously, the position of the cylinder body 4 can be finely adjusted to facilitate the lowering of the cylinder body 4. When the loading hydraulic cylinder device is working: when the shoe pressing plate 2 is subjected to the reaction force from the back roller, the floating loading hydraulic cylinder device can absorb part of the impact force. Furthermore, because the cylinder body 4 can float on the bottom surface of the shoe plate 2, the shoe pressing plate 2 can be finely adjusted relative to the back roller, allowing for better contact between the shoe plate 2 and the lower back roller, resulting in a wider pressing area and maintaining a stable pressing zone width and linear pressure. This utility model has a simple structure and is easy to install and maintain.

[0018] Furthermore, the upper diameter of the cylinder bottom cover 5 is larger than the lower diameter; the lower surface of the upper end of the cylinder bottom cover 5 is clearance-fitted with the upper surface of the bottom plate of the cylinder body 4. The cylinder body 4 can float on the shoe plate 2. With the clearance fit, the friction between the shoe plate 2 and the cylinder body 4, and between the cylinder bottom cover 5 and the bottom plate of the cylinder body 4, is smaller, allowing for better adaptive adjustment of position in response to external forces.

[0019] The distance between the lower surface of the upper end of the cylinder bottom cover 5 and the upper surface of the bottom plate of the cylinder body 4 shall not exceed 0.5 mm. Preferably, it should be around 0.2 mm. Excessive spacing should be avoided to prevent oil leakage.

[0020] A sealing structure is provided between the lower surface of the cylinder body 4 and the shoe plate 2; a through hole is provided on the cylinder bottom cover 5 as an oil inlet 50. This can be a dynamic seal or an oil seal 9, such as a common sealing ring. Sliding connections or floating structures require a sealing structure to prevent oil leakage. Here, an oil seal 9 is preferred as the sealing structure. The method of setting the oil seal 9 is existing technology and will not be described in detail. Oil inlets and outlets are present in all existing loading hydraulic cylinders and will not be described in detail.

[0021] A sealing structure is provided between the outer surface of the piston 3 and the inner surface of the side wall of the cylinder 4; a sealing structure is also provided at the contact surface between the piston 3 and the roller core 1. A Gladley ring 8 can be provided at the contact position between the piston 3 and the side wall of the cylinder 4 to prevent oil leakage from the cylinder 4. A sealing ring is provided at the contact surface between the piston 3 and the roller core 1 to prevent oil leakage during hydraulic cylinder operation. Other common hydraulic oil sealing structures can also be used, which will not be described in detail here. Additionally, a countersunk hole is machined on the bottom surface of the piston 3, and the piston 3 is fixed to the roller core 1 with bolts. A countersunk hole is also provided on the cylinder bottom cover 5, and the cylinder bottom cover 5 is fixed to the shoe plate 2 with bolts. Furthermore, a row of loading hydraulic cylinders with the above structure is arranged side by side between the roller core 1 and the shoe plate 2.

[0022] In addition, the piston 3 is also provided with an exhaust structure. The exhaust structure includes an exhaust component body 6, which has a through hole. At least one section of the through hole is a small hole 60 with a diameter not greater than 0.3 mm. The size of the small hole 60 is smaller than the size of other parts of the through hole. The piston 3 is provided with an exhaust channel 7 that leads to the outside of the hydraulic cylinder cavity. The exhaust component body 6 is detachably provided on the piston 3. One end of the through hole of the exhaust component body 6 is connected to the highest point of the cavity, and the other end is connected to the exhaust channel 7. The small hole 60 in the through hole is currently used for throttling and distributing flow. In this case, the size of the small hole 60 is greater than 0.5 mm. Generally, it can be set between 0.5 mm and 0.5 mm. This utility model is the first to use a small hole 60 of less than 0.3 mm for exhaust flow obstruction. According to actual needs, the smaller the diameter of the small hole 60, the better. However, a hole that is too small is not easy to process, and the processing difficulty and cost will increase significantly. When the viscosity of the hydraulic oil passing through the small hole 60 is high, a larger value is used, and when the viscosity is low, a smaller value is used. The highest point of the cavity here is a range, and the distance from the highest point can be a certain distance, such as a few millimeters.

[0023] The exhaust component body 6 has a mounting end 64 at either end of the through hole; the piston 3 is an inverted cylindrical shape, with a central hole 30 at the top center of the piston 3 communicating with the inner cavity of the cylinder; the central hole 30 is a stepped hole, wider at the top and narrower at the bottom, with a mounting hole on the bottom surface of the larger hole; the mounting end 64 of the exhaust component body 6 is located within the mounting hole, and the other end of the exhaust component body 6 is located near its highest point within the larger hole of the central hole 30; the exhaust channel 7 is located below the mounting hole and intersects with it. The exhaust channel 7 is preferably a horizontally arranged blind hole. Other exhaust structures are also acceptable, as long as they enable exhaust.

[0024] The mounting end 64 is cylindrical, and its outer surface is either a smooth shaft or has external threads. The small hole 60 is located in the middle section of the through hole. The upper section of the through hole is a conical hole 61, and the small end of the conical hole 61 communicates with the small hole 60. The lower section of the through hole is a cylindrical hole 62, and one end of the cylindrical hole 62 communicates with the small hole 60 through a conical transition hole. The cylindrical hole 62 is located at the mounting end 64, and the conical hole 61 is located away from the mounting end 64. A slot 63 is provided on the end of the exhaust component body 6 away from the mounting end 64. The diameter of the small hole 60 is between 0.1 mm and 0.3 mm. The exhaust component body 6 is made of a corrosion-resistant and wear-resistant material. The width of the slot 63 can be 1 mm. The slot 63 facilitates the installation of the exhaust component body 6 of this invention onto or from a product using tools such as screwdrivers. The exhaust component body 6 can be made of copper alloy or stainless steel, etc. The mounting end 64 is threadedly connected to other products, such as hydraulic cylinders. Alternatively, the mounting end 64 can be a smooth shaft, mating with holes on other products. Or, the mounting end 64 can be bolted to other products. The thread on the mounting end 64 can be an M4-M6 external thread.

[0025] In this invention, the venting component of the shoe-pressure loading hydraulic cylinder is installed on the cylinder body. During use, oil is supplied to the hydraulic cylinder through a pipe, causing any air previously trapped inside to accumulate at the top. As hydraulic oil is introduced, the air is expelled through the small hole 60 on the venting component. With no air in the hydraulic cylinder, the loading force will not fluctuate. During operation, a small amount of hydraulic oil will be discharged through the small hole 60. Because the shoe-pressure loading hydraulic cylinder is installed in a sealed space, and due to lubrication and cooling requirements, a large amount of oil exists within this sealed space, the small amount of oil discharged through the small hole 60 will not cause oil leakage or contamination. Furthermore, because the discharged oil volume is very small and the inlet pipe diameter of the loading hydraulic cylinder is large, the small amount of oil discharged will not cause a drop in the hydraulic pressure of the loading hydraulic cylinder.

[0026] In specific implementation: A back roller is installed below the shoe plate 2. A pressing zone is formed between the shoe plate 2 and the back roller. A row of loading hydraulic cylinders is installed between the shoe plate 2 and the upper shoe core. When loading is required: hydraulic oil enters the cavity of the loading hydraulic cylinder through the oil inlet 50 to pressurize the loading hydraulic cylinder. The loading force of the hydraulic cylinder is stabilized by venting through the venting device. The floating between the cylinder body 4 and the shoe plate 2 allows for better fit between the shoe plate 2 and the lower back roller, thereby ensuring a stable pressing zone width and linear pressure.

[0027] The technical features of the embodiments described above can be combined in any way, and as long as there is no contradiction in the combination of these technical features, they should all be considered within the scope of this specification. Without departing from the overall concept of this utility model, any equivalent substitutions or modifications made to the technical solution of this utility model, as well as any changes and improvements, should also be considered within the protection scope of this utility model.

Claims

1. A position-floating loading hydraulic cylinder device, comprising a piston fixed to an upper roller core and a cylinder barrel; characterized in that: The cylinder includes a cylinder body and a cylinder bottom cover fixed to a shoe plate below; the cylinder body includes an integrally formed side wall and a bottom plate; the piston is slidably disposed on the inner surface of the side wall of the cylinder body; the bottom plate has a central hole, the lower end of the cylinder bottom cover is disposed in the central hole, the upper end of the cylinder bottom cover presses on the bottom plate of the cylinder body and is slidably connected to the bottom plate of the cylinder body; the bottom of the cylinder body is slidably connected to the shoe plate.

2. The position-floating loading hydraulic cylinder device according to claim 1, characterized in that: The diameter of the upper end of the cylinder bottom cover is larger than the diameter of the lower end; the lower surface of the upper end of the cylinder bottom cover is fitted with a clearance fit to the upper surface of the bottom plate of the cylinder body.

3. The floating-position loading hydraulic cylinder device according to claim 2, characterized in that: The distance between the lower surface of the upper end of the cylinder bottom cover and the upper surface of the bottom plate of the cylinder body is no more than 0.5 mm.

4. The position-floating loading hydraulic cylinder device according to claim 1, characterized in that: A sealing structure is provided between the lower surface of the cylinder block and the boot plate; a through hole is provided on the cylinder bottom cover as an oil inlet.

5. The position-floating loading hydraulic cylinder device according to claim 4, characterized in that: A sealing structure is provided between the outer surface of the piston and the inner surface of the cylinder sidewall; a sealing structure is provided at the contact surface between the piston and the roller core.

6. The position-floating loading hydraulic cylinder device according to claim 1, characterized in that: A row of loading hydraulic cylinders is arranged side by side between the roller core and the boot plate.

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