Compression mechanism

Abstract

A compression system comprising two pressers (2,3) mounted on a load-bearing frame (1), wherein each presser is pressed against one another by a corresponding thrusting means (5) that generates a predetermined thrust (L5), an adjustable stopper (60) fixed to the load-bearing frame (1) is positioned between the load-bearing frame and the thrusting means, facing the thrusting means, and configured to absorb a portion (L6) of the thrust (L5) and discharge it to the frame, thereby transmitting a second portion (L23) of the thrust (L5) to the two pressers, the adjustable stoppers are each connected to positioning means (6), the thrusting means comprises at least one first actuator cylinder supplied with fluid at a predetermined pressure, the at least one first actuator cylinder having a known and predetermined hole; and means for adjusting the adjustable stoppers comprises at least one other actuator cylinder.

Description

Technical Field

[0001] The present invention relates to a mechanical compression system provided with an integrated control mechanism.

Background Art

[0002] More specifically, the control mechanism according to the present invention is intended to be incorporated into a system in which two presses cooperate with each other to apply a predetermined pressure to a compression object. For example, this type of system includes a roller and a counter roller that define a nip through which a web-like material such as paper or non-woven fabric (TNT) passes, and acts to apply the pressure applied by two actuators acting on two opposite sides of the roller to the material. Generally, the pressure applied by the press changes over time due to various factors such as, for example, wear of the surface of one or two presses; mechanical property fluctuations of the surface coating of one or both presses due to temperature changes associated with long-term use of the presses; property fluctuations of the material processed by the presses; fluctuations due to environmental conditions and the nature of the processed material that do not always have constant physical properties; and the like.

[0003] Therefore, an operator responsible for operating a machine using these compression systems needs to perform adjustment work. However, since these adjustment operations are generally performed after an inspection to check whether the processed material conforms to the preset production standards, there is generally a delay. As a result, waste is generated and production costs increase.

[0004] Patent Document 1 discloses a roll mill for crushing large materials, and this roll mill has a configuration in which a pair of pressing rolls are connected to a synchronizing device. This synchronizing device includes two hydraulic actuators that act on each floating bearing supporting one of the two presses. The synchronizing device is arranged behind the pressing roller that acts, and is configured to adjust the relative position of the floating bearing of this roller and avoid or limit the loss of parallelism of the axes of the two pressing rolls. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] US2023 / 0085467A1 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The main objective of this invention is to eliminate, or at least significantly mitigate, the aforementioned drawbacks. [Means for solving the problem]

[0007] This objective is achieved by adopting the technical idea of ​​providing a control mechanism for a mechanical compression system having the characteristics described in claim 1, in accordance with the present invention. Other features of the present invention are the subject of the dependent claims. [Effects of the Invention]

[0008] The present invention enables more precise application of pressure to the material being processed, thereby improving the quality of processes using this control mechanism, enhancing compliance of the processed material quality with pre-set production standards, and reducing waste. All of these can be achieved at a very low implementation cost compared to the benefits provided by this control mechanism. These advantages and other features of the present invention will be better understood by those skilled in the art through the following description and accompanying drawings. However, these descriptions and accompanying drawings are illustrative and should not be interpreted in a restrictive sense. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic side view showing the control mechanism for a mechanical compression system according to the present invention applied to an embossing unit for processing web-like materials such as paper and TNT. [Figure 2] This diagram is similar to Figure 1, and shows forces L5, L23, and L6. [Modes for carrying out the invention]

[0010] The following detailed description illustrates one example of an embossing unit for processing web-like materials such as tissue paper, employing the control mechanism according to the present invention.

[0011] Figure 1 shows an embossing unit (UG) for a web-like material, which comprises a load-bearing frame (1) to which a steel roller (2) having notches formed on its outer surface (20) is attached, and an opposing roller (3) whose outer surface (30) is covered with rubber. The steel roller (2) and the opposing roller (3) define a nip (N) through which the web-like material (MN) passes, and the web-like material (MN) is embossed as a result of passing through the nip (N). The rollers (2) and the opposing roller (3) are arranged with their axes parallel to each other in the lateral direction with respect to the frame (1). The rollers (2) are rotated around their axis (A2) at a preset angular velocity by a corresponding drive unit (M2). The axis (A2) of the rollers (2) is fixed. The opposing roller (3) is supported on both sides by levers (4) connected to their respective thrust cylinders (5). Since Figure 1 is a side view of the stacking unit (U), only one lever (4) and one thrust cylinder (5) are visible in Figure 1. Each lever (4) is locked at each end (3E) of the opposing roller (3) by a semi-collar (40) that grips the end in coordination with the concave surface (41) of the lever. The thrust cylinder (5) is integrated with the frame (1).

[0012] The thrust cylinder (5) presses the opposing roller (3) toward the roller (2) via the lever (4).

[0013] The thrust cylinder (5) is supplied with a working fluid at a preset pressure (P) related to the thrust exerted by the opposing roller (3) on the roller (2) according to programmed processing. In Figure 1, the supply of working fluid to the cylinder (5) is represented by the arrow "FL".

[0014] The stroke of the rod (50) of each cylinder (5) is limited by its respective adjustable stopper (60).

[0015] Each stopper (60) is composed of the free end of the rod of yet another cylinder (6) integrally formed with the frame (1), and is arranged horizontally coaxially with the rod (50) of the thrust cylinder (5). The other cylinder (6) is provided to generate a thrust (L6) of a predetermined value. The function of this thrust (L6) is described below.

[0016] For example, the other cylinder (6) is supplied with fluid at the same pressure (P) as the thrust cylinder (5), and has a smaller hole (A6) than the hole (A5) of the thrust cylinder (5). Therefore, the thrust (L5) generated by the thrust cylinder (5) is greater than the thrust (L6) generated by the other cylinder (6).

[0017] Furthermore, it is understood that the other cylinder (6) is supplied with a fluid different from the fluid supplied to the thrust cylinder (5) under a pressure sufficient to generate the thrust (L6).

[0018] Under conditions where the forces acting are symmetrical during operation, the thrust (L5) generated by each cylinder (5) via each rod (50) is: L5 = 1 / 2 × L23 + L6 This is shown, where L23 is the load acting between the rollers (2) and (3) and is a known value and a preset process parameter.

[0019] In this regard, the load (L6) is an additional load with respect to the load (L23), and acts for the purpose of increasing the rigidity of the embossing unit and reducing vibrations that normally occur during the operation of the embossing unit.

[0020] Each stopper (60) prevents the forward movement of the rod (50) of each of the cylinders (5), and releases the force (L6) to the frame (1).

[0021] The thrust forces (L5) and (L6) do not change because they are associated with the constant pressure (P) of the cylinders (5) and (6) and the invariant holes. Therefore, even when the surface characteristics of the pressure rollers (2, 3) change [for example, when the rubber coating of the roller (3) wears or overheats, and its elastic and / or geometric characteristics change], the thrust force (L23) also remains constant. In this way, a self-adjusting system is realized. When the pressure (P) increases or decreases, the thrust force (L23) is automatically adjusted. This is because the increase or decrease in the pressure (P) is defined by the difference between the thrust force (L5) and the thrust force (L6), and this difference depends directly on the pressure (P) and the invariant geometric characteristics (especially the holes) of the cylinders (5) and (6).

[0022] For example, the other cylinder (6) is supplied via a hydraulic accumulator (8), and the hydraulic accumulator (8) is filled with the same fluid as that supplied to the thrust cylinder (5), and at its outlet, supplies a different fluid to the other cylinder (6) at the same supply pressure (P) as the thrust cylinder (5). The presence of the accumulator (8) stabilizes the supply pressure of the other cylinder (6) in a known manner.

[0023] Preferably, a flow control valve (7) is inserted into the supply line (F6) of the other cylinder (6), and its function is to slow down the movement of the stopper (60) and prevent the return of fluid from the other cylinder (6) to the accumulator (8) due to the influence of mechanical vibrations transmitted through the stopper (60).

[0024] In a simplified configuration of the system of the present invention, the thrusting means may consist only of cylinders (5), and the number of cylinders (5) may differ from those exemplified above, depending on the specific practical application of the system. Similarly, an adjustable stopper device that absorbs a portion of the thrust generated by the pressing means can consist of a single adjustable stopper configured as described above or two or more adjustable stoppers.

[0025] In the embodiments shown in Figures 1 and 2, the load support frame (1) has two opposing vertical sides and a horizontal side connecting the lower parts of these vertical sides, forming a frame on which the roller (2) and the opposing roller (3) are arranged. The thrust cylinder (5) is attached to one of the vertical sides of the load support frame (1), while the other cylinder (6) is attached to the opposite vertical side.

[0026] More generally, the thrust cylinder (5) and the other cylinder (6) are attached to two opposing parts of the load-bearing frame (1).

[0027] Therefore, according to the present invention, a system is provided which includes first and second pressers (2,3) attached to a load-supporting frame (1), wherein the first and second pressers (2,3) have opposing compression surfaces (20,30), and in this system, - One of the two pressers is configured to be pressed toward the other presser by a thrusting means (5) positioned in front of it, and the thrusting means (5) is configured to generate a thrust (L5) of a predetermined value. - An adjustable stopper (60) connected to the load support frame (1) is positioned opposite the thrust means (5) and between the load support frame (1) and the thrust means (5), absorbing a portion (L6) of the thrust (L5) and discharging it back to the frame (1), thereby transmitting a second portion (L23) of the thrust (L5) to the two pressers. -Each adjustable stopper (60) is connected to an adjustment means (6), which adjusts the position of the adjustable stopper (60) relative to the thrust means (5). -The thrusting means (5) includes at least one first actuator cylinder to which a fluid of a predetermined pressure (P) is supplied, the at least one first actuator cylinder having a known and predetermined hole (A5); and - The means (6) for adjusting the adjustable stopper includes at least one other actuator cylinder.

[0028] The system of the present invention may have one or more of the following features, even in combination with each other: -At least one other actuator cylinder is also supplied with fluid at the predetermined pressure (P), and the at least one other actuator cylinder has a hole (A6) that is smaller than the hole (A5) of at least one of the first actuator cylinders; - The pressers (2,3) are rollers parallel to each other, and one of the two rollers is connected to a corresponding motor member (M2), which controls the rotation of the motor member (M2) at a predetermined angular velocity around its axis (A2); - The pressers (2,3) are rollers parallel to each other, one of the two rollers is connected to a corresponding motor member (M2), the motor member (M2) controls rotation at a predetermined angular velocity around its axis (A2), the outer surface of one of the two rollers is grooved, and the outer surface of the other roller is smooth, preferably with a rubber coating; - The pressers (2,3) are rollers parallel to each other, one of which is connected to a corresponding motor member (M2), the motor member (M2) controls rotation at a predetermined angular velocity around its axis (A2), and the outer surfaces of the two rollers are smooth; - The pressers (2,3) are rollers parallel to each other, and the two rollers are motor-driven, that is, rotated by the same motor or two different motors, for example, when the two rollers are motor-driven and have smooth outer surfaces, when the two rollers are motor-driven and one roller is grooved and the other is smooth, or when both rollers are grooved. -The other cylinder (6) is supplied via a hydraulic accumulator (8), which is supplied with the same fluid as supplied to at least one first actuator cylinder, and at its outlet supplies a different fluid to the at least one other cylinder (6) at the same supply pressure (P) as the first actuator cylinder; - A flow control valve (7) is inserted into the supply line (F6) of at least one other cylinder (6).

[0029] However, in practice, the details of implementation can be modified in a manner equivalent to the specific descriptions and illustrated content of the individual elements and without departing from the technical idea of ​​the adopted solution, and such modifications to the details of implementation fall within the scope of the protection granted by this patent in accordance with the following claims.

Claims

1. A mechanical compression system comprising two first and second pressers (2, 3) attached to a load-supporting frame (1), wherein the first and second pressers (2, 3) each have opposing compression surfaces (20, 30), - One of the two pressers is configured to be pressed toward the other presser by a thrusting means (5) positioned in front of it, and the thrusting means (5) is configured to generate a thrust (L5) of a predetermined value. - An adjustable stopper (60) connected to the load support frame (1) is positioned opposite the thrust means (5) and between the load support frame (1) and the thrust means (5), absorbing a portion (L6) of the thrust (L5) and discharging it to the frame (1), thereby transmitting a second portion (L23) of the thrust (L5) to the two pressers. - The adjustable stopper (60) is connected to each of the adjusting means (6) that adjusts the position of the stopper (60) relative to the thrust means (5), - The thrust means (5) includes at least one first actuator cylinder to which a fluid of a predetermined pressure (P) is supplied, the at least one first actuator cylinder having a known predetermined hole (A5); and - The adjustment means (6) for adjusting the adjustable stopper includes at least one other actuator cylinder, Mechanical compression system.

2. The mechanical compression system according to claim 1, wherein the fluid at the predetermined pressure (P) is also supplied to the at least one other actuator cylinder, and the at least one other actuator cylinder has a hole (A6) smaller than the hole (A5) of the at least one first actuator cylinder.

3. The aforementioned presser (2, 3) consists of two rollers that are parallel to each other. One of the two rollers is connected to a corresponding motor member (M2), and the motor member (M2) controls its rotation at a predetermined angular velocity around its axis (A2). The mechanical compression system according to claim 1.

4. The aforementioned presser (2, 3) consists of two rollers that are parallel to each other. One of the two rollers is connected to a corresponding motor member (M2), and the motor member (M2) controls its rotation at a predetermined angular velocity around its axis (A2). The outer surface of one of the two rollers is engraved, and the outer surface of the other roller is smooth, preferably with a rubber coating. The mechanical compression system according to claim 1.

5. The aforementioned presser (2, 3) consists of two rollers that are parallel to each other. One of the two rollers is connected to a corresponding motor member (M2), and the motor member (M2) controls its rotation at a predetermined angular velocity around its axis (A2). The outer surfaces of the two rollers are smooth. The mechanical compression system according to claim 1.

6. The aforementioned presser (2, 3) consists of two rollers that are parallel to each other. The two rollers in question are motor-driven. The mechanical compression system according to claim 1.

7. Another actuator cylinder of the adjustment means (6) is supplied with fluid via a hydraulic accumulator (8), which is supplied with the same fluid as supplied to the at least one first actuator cylinder, and at its outlet supplies a different fluid to at least one other cylinder at the same supply pressure (P) as the first actuator cylinder. The mechanical compression system according to claim 1.

8. The mechanical compression system according to claim 1, wherein a flow control valve (7) is inserted into the supply line (F6) of at least one other actuator cylinder.

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