Dual belt press

Abstract

Leakage of pressurizing fluid contained in a pressurizing chamber from a seal portion is suppressed. In a double belt press, the seal portion that seals the pressurizing chamber has an inner seal member, an outer seal member, and a partition wall portion. The inner seal member has an inner seal flow passage that has a suction port that sucks the seal fluid supplied to an inner seal groove and a spouting port that spouts the seal fluid sucked from the suction port toward a belt, at both ends. The outer seal member has an outer seal flow passage that has a suction port that sucks the seal fluid supplied to an outer seal groove and a spouting port that spouts the seal fluid sucked from the suction port toward the belt, at both ends. In the partition wall portion, a plurality of fluid supply passages that supply the seal fluid to each of the inner seal groove and the outer seal groove, and each of a plurality of fluid recovery passages that recover the seal fluid accumulated in a space formed between the inner seal member and the outer seal member are disposed at mutually different positions in a direction along an outer edge of the pressurizing chamber.

Description

Technical Field

[0001] This invention relates to a hydraulic double-belt press for compression molding of products. Background Technology

[0002] In the continuous pressurization apparatus described in Patent Document 1, by pressing the sliding member against the conveyor belt, the pressurizing fluid inside the pressurization chamber is prevented from leaking to the outside of the pressurization chamber. Furthermore, by allowing the sealing fluid to flow out from a recess formed on the surface of the sliding member opposite the conveyor belt, a flow layer of sealing fluid is formed between the sliding member and the conveyor belt. This flow layer prevents the pressurizing fluid inside the pressurization chamber from leaking to the outside of the pressurization chamber.

[0003] In Patent Document 1, although the pressurized fluid in the pressurization chamber is prevented from leaking as described above, leakage of the pressurized fluid from the gap between the sliding member and the conveyor belt cannot be avoided. Therefore, the leaked pressurized fluid must be discharged. Specifically, a discharge space is formed between the sealing member and the sliding member by pressing the sealing member against the conveyor belt. Then, the pressurized fluid that has leaked into the discharge space is discharged from the discharge hole.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent document 1: Japanese Patent Application Publication No. 3-264196. Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In Patent Document 1, although the sealing element is pressed against the conveyor belt, a gap is created between the sealing element and the conveyor belt due to the movement of the conveyor belt, and fluid sometimes leaks through this gap. Patent Document 1 describes using multiple sealing elements to suppress fluid leakage, but this results in an increase in the number of components or a larger continuous pressurization device.

[0009] means for solving problems

[0010] This invention relates to a dual-belt press, which simultaneously conveys the product using a pair of belts clamping it, and pressurizes the product using a pressurizing fluid contained in a pressurizing chamber. The dual-belt press has a sealing portion disposed along the outer edge of the pressurizing chamber to seal it. The sealing portion includes an inner seal, an outer seal, and a partition wall.

[0011] An inner seal is housed within an inner sealing groove, and an inner sealing flow channel with an intake port and an outlet port at both ends is formed inside the inner seal. Sealing fluid supplied to the inner sealing groove is drawn into the intake port, and the sealing fluid drawn in from the intake port is ejected from the outlet port onto the belt.

[0012] An outer seal is housed in an outer sealing groove, which is located further away from the pressure chamber than the inner sealing groove. An outer sealing flow channel with an intake port and an outlet port is formed inside the outer seal. Sealing fluid supplied to the outer sealing groove is drawn into the intake port, and the sealing fluid drawn in from the intake port is ejected from the outlet port onto the belt.

[0013] A partition wall is formed between the inner sealing groove and the outer sealing groove, and has multiple fluid supply channels for supplying sealing fluid to each of the inner and outer sealing grooves, and multiple fluid recovery channels for recovering sealing fluid accumulated in the space formed between the inner and outer seals. Each of the multiple fluid supply channels and multiple fluid recovery channels is located at a different position along the outer edge of the pressurization chamber.

[0014] A deformable inner sealing member can be disposed between the bottom surface of the inner sealing groove and the inner sealing member, and a deformable outer sealing member can be disposed between the bottom surface of the outer sealing groove and the outer sealing member. The deformable inner sealing member is subjected to a pressing force from fluid supplied from the bottom surface of the inner sealing groove, applying force to the inner sealing member towards the belt. The deformable outer sealing member is subjected to a pressing force from fluid supplied from the bottom surface of the outer sealing groove, applying force to the outer sealing member towards the belt. The force applied to the inner sealing member towards the belt can be greater than the force applied to the outer sealing member towards the belt.

[0015] The fluid supply channel for supplying sealing fluid to the inner sealing groove can supply sealing fluid from the side of the partition wall portion forming part of the inner sealing groove in an inclined direction toward the belt. On the other hand, the fluid supply channel for supplying sealing fluid to the outer sealing groove can supply sealing fluid from the side of the partition wall portion forming part of the outer sealing groove in an inclined direction toward the belt.

[0016] The wiper, which is pressed against the surface of the belt along the outer edge of the pressure chamber, is positioned further away from the pressure chamber than the sealing section. A recovery port for recovering sealing fluid can be provided between the sealing section and the wiper.

[0017] At least one of the inner and outer seals can be composed of a first and a second set of seals connected to each other. The first and second sets of seals can be displaced relative to each other in the direction in which the products are clamped by a pair of belts. In addition, multiple sets of seals (1 to Nth sets of seals; N is a positive number of 2 or more) can be provided.

[0018] Invention Effects

[0019] According to the present invention, by spraying sealing fluid from the inner seal and the outer seal respectively onto the belt, layers of sealing fluid can be formed between the inner seal and the belt, and between the outer seal and the belt. These layers can suppress leakage of pressurized fluid contained in the pressurization chamber from the sealing portion. Attached Figure Description

[0020] Figure 1 This is a schematic three-dimensional diagram representing a double-belt press.

[0021] Figure 2 This is a schematic top view showing a portion of the surface in contact with the belt in the lower pressurized unit.

[0022] Figure 3 It is a cross-sectional view of a portion of the upper and lower pressurization units.

[0023] Figure 4 yes Figure 2 A1-A1 section view or A2-A2 section view.

[0024] Figure 5 yes Figure 2 The B1-B1 section view or the B2-B2 section view.

[0025] Figure 6 yes Figure 2 The C1-C1 section view or the C2-C2 section view.

[0026] Figure 7 It is a diagram showing the shape of the oil spray outlet in the inner and outer seals.

[0027] Figure 8 It is a schematic diagram showing the structure of the internal or external seal.

[0028] Figure 9 This is a schematic diagram of the first and second seals viewed from the Z-direction.

[0029] Figure 10 This is a schematic diagram (modified example) of the first and second seals viewed from the Z direction. Detailed Implementation

[0030] Figure 1 This is a schematic perspective view showing the dual-belt press 1 as described in this embodiment. Figure 1 In this embodiment, the X-axis, Y-axis, and Z-axis are mutually orthogonal axes. In this embodiment, the Z-axis is an axis that extends in the vertical direction.

[0031] like Figure 1As shown, the compression-molded product is supplied to a dual-belt press 1 (between a pair of belts 13a and 13b, described later), and after compression molding using the dual-belt press 1 (the upper pressure unit 20a and the lower pressure unit 20b, described later), it is discharged from the dual-belt press 1. Examples of such products include, for example, metal composite materials, laminated products (CCL; Copper Clad Laminate), fiber-reinforced plastics (CFRP; Carbon Fiber Reinforced Plastics, GFRP; Glass Fiber Reinforced Plastics), functional films, and various sheets.

[0032] The double-belt press 1 has a pair of inlet pulleys 11a and 11b and a pair of outlet pulleys 12a and 12b. Annular belts 13a are mounted on the inlet pulleys 11a and 12a, and annular belts 13b are mounted on the inlet pulleys 11b and 12b. Cylinders 14 are connected to the inlet pulleys 11a and 11b respectively. The cylinders 14 adjust the tension of the belts 13a and 13b by adjusting the positions of the inlet pulleys 11a and 11b.

[0033] A power source (not shown) is connected to the output pulley 12a. By driving the output pulley 12a with power from the power source, the belt 13a can be moved in the direction of arrow D1. Similarly, a power source (not shown) is connected to the output pulley 12b. By driving the output pulley 12b with power from the power source, the belt 13b can be moved in the direction of arrow D2. Rotary encoders (not shown) are connected to the input pulleys 11a and 11b, and the rotation of the output pulleys 12a and 12b can be controlled based on the output of the rotary encoders.

[0034] An upper pressure unit 20a is disposed between the inlet pulley 11a and the outlet pulley 12a, and the upper pressure unit 20a contacts the inner surface of the annular belt 13a. A lower pressure unit 20b is disposed between the inlet pulley 11b and the outlet pulley 12b, and the lower pressure unit 20b contacts the inner surface of the annular belt 13b.

[0035] The upper pressurizing unit 20a and the lower pressurizing unit 20b sandwich a pair of belts 13a and 13b, applying compressive force to the product located between the belts 13a and 13b. Specifically, the product is conveyed while being sandwiched between the belts 13a and 13b, and is compressed and shaped by the upper pressurizing unit 20a and the lower pressurizing unit 20b. The compressed and shaped product is then conveyed while being sandwiched between the belts 13a and 13b, and is discharged from the dual-belt press 1.

[0036] An oil supply pipe 31 and an oil discharge pipe 32 are connected to the upper pressurization unit 20a and the lower pressurization unit 20b, respectively. The oil supply pipe 31 supplies oil to the upper pressurization unit 20a and the lower pressurization unit 20b, respectively, and the oil discharge pipe 32 collects and discharges the oil used in the upper pressurization unit 20a and the lower pressurization unit 20b, respectively.

[0037] The oil supply pipe 31 includes: an oil supply pipe 31 for supplying oil for pressurizing the product (hereinafter referred to as "pressurizing oil Op"); an oil supply pipe 31 for supplying oil to the inner sealing groove 41 or the outer sealing groove 42 described later (hereinafter referred to as "sealing oil Os"); and an oil supply pipe 31 for supplying oil for applying force to the inner seal 60a and the outer seal 60b described later (hereinafter referred to as "force-applying oil Ob"). The oil discharge pipe 32 includes: an oil discharge pipe 32 for discharging the sealing oil Os (inner sealing oil Os1 and outer sealing oil Os2 described later) recovered from the oil recovery port 43e described later; and an oil discharge pipe 32 for discharging the sealing oil Os (inner sealing oil Os1 and outer sealing oil Os2 described later) recovered from the oil recovery port 44 described later.

[0038] In this embodiment, oil is supplied to both the upper pressurizing unit 20a and the lower pressurizing unit 20b, but the method is not limited to this. That is, the dual-belt press 1 can be operated even if a fluid other than oil is used.

[0039] Figure 2 It is from the 13b side (i.e., Figure 1 A schematic diagram showing a portion of the lower pressurization unit 20b viewed from the upper side. Furthermore, Figure 3 This is a vertical cross-sectional view (YZ section view) showing a portion of the structure of the upper pressurizing unit 20a and the lower pressurizing unit 20b. Here, the upper pressurizing unit 20a and the lower pressurizing unit 20b each have the same structure and are arranged symmetrically, one above the other. Figure 2 and Figure 3 The inner seal 60a and outer seal 60b, which will be described later, are omitted (see reference). Figures 4-6 ).

[0040] like Figure 2 As shown, the lower pressurizing unit 20b has a pressurizing chamber 21 that applies compressive force to the product via belt 13b. As Figure 3As shown, a heating element 21a and pressurizing oil Op are contained in the pressure chamber 21. The pressurizing oil Op contained in the pressure chamber 21 of the upper pressure unit 20a is in contact with the upper surface of the belt 13a, and is used to apply compressive force to the product via the belt 13a. The pressurizing oil Op contained in the pressure chamber 21 of the lower pressure unit 20b is in contact with the lower surface of the belt 13b, and is used to apply compressive force to the product via the belt 13b. The heating element 21a is used to heat the pressurizing oil Op contained in the pressure chamber 21. Therefore, the product is compressed and shaped while heated.

[0041] like Figure 2 As shown, a sealing portion 40 and a wiper 50 are provided on the outer edge of the pressure chamber 21. The sealing portion 40 and the wiper 50 are formed in a rectangular shape along the outer edge of the pressure chamber 21 in the XY plane to prevent the pressurizing oil Op used in the pressure chamber 21 from leaking to the outside of the upper pressurizing unit 20a and the lower pressurizing unit 20b. The wiper 50 is located further away from the pressure chamber 21 than the sealing portion 40. The wiper 50 can be made of, for example, metal or resin. An oil recovery port 44 is provided between the sealing portion 40 and the wiper 50 to recover the sealing oil Os (inner sealing oil Os1 and outer sealing oil Os2, described later) when it leaks from the sealing portion 40.

[0042] The sealing part 40 has an inner sealing groove 41 and an outer sealing groove 42, which are both rectangular in shape along the outer edge of the pressure chamber 21 in the XY plane. The inner sealing groove 41 is located closer to the pressure chamber 21 than the outer sealing groove 42, and the outer sealing groove 42 is located further away from the pressure chamber 21 than the inner sealing groove 41. A partition wall 43 is provided between the inner sealing groove 41 and the outer sealing groove 42. Here, the partition wall 43 has two sidewalls, one sidewall forming part of the inner sealing groove 41 and the other sidewall forming part of the outer sealing groove 42.

[0043] Sealing oil Os (inner sealing oil Os1, outer sealing oil Os2) is supplied from the partition wall portion 43 to the inner sealing groove 41 and the outer sealing groove 42 respectively, and the sealing oil Os supplied to the inner sealing groove 41 and the outer sealing groove 42 is recovered from the partition wall portion 43. The structure for supplying sealing oil Os to the inner sealing groove 41 and the outer sealing groove 42, and the structure for recovering sealing oil Os, will be described later.

[0044] like Figure 3 As shown, the front end of the wiper 50 is pressed against the surfaces of belts 13a and 13b to prevent oil (mainly sealing oil Os) from leaking along the surfaces of belts 13a and 13b to the outside of the upper pressurizing unit 20a and the lower pressurizing unit 20b.

[0045] Figure 4 It means Figure 2 A schematic diagram of section A1-A1 or section A2-A2, mainly showing the structure for supplying internal sealing oil Os1 to the internal sealing groove 41. For example... Figure 4 As shown, an inner sealing element 60a and an inner sealing deformable member 80a are disposed inside the inner sealing groove 41, and an outer sealing element 60b and an outer sealing deformable member 80b are disposed inside the outer sealing groove 42. The inner sealing element 60a and the inner sealing deformable member 80a are disposed along the inner sealing groove 41 and are formed into a rectangular shape in the XY plane. Similarly, the outer sealing element 60b and the outer sealing deformable member 80b are disposed along the outer sealing groove 42 and are formed into a rectangular shape in the XY plane.

[0046] The inner seal 60a and outer seal 60b can be formed of metals such as iron or alloys. The deformable inner seal member 80a is disposed on the bottom surface of the inner sealing groove 41, and the deformable outer seal member 80b is disposed on the bottom surface of the outer sealing groove 42. Elastically deformable components, such as O-rings, can be used as the inner and outer seal deformable members 80a and 80b. The inner seal deformable member 80a is disposed between the bottom surface of the inner sealing groove 41 and the inner seal 60a, and contacts both the bottom surface of the inner sealing groove 41 and the inner seal 60a. Similarly, the outer seal deformable member 80b is disposed between the bottom surface of the outer sealing groove 42 and the outer seal 60b, and contacts both the bottom surface of the outer sealing groove 42 and the outer seal 60b.

[0047] An oil supply channel 81a is connected to the bottom surface of the inner sealing groove 41, through which inner sealing oil Ob1 is supplied to the inner sealing groove 41. The oil supply channel 81a is kept blocked by the inner sealing deformable member 80a at the bottom surface of the inner sealing groove 41. The inner sealing oil Ob1 supplied from the oil supply channel 81a to the inner sealing groove 41 generates a force (hereinafter referred to as "pressing force F1") that presses the inner sealing member 60a against the belt 13b via the inner sealing deformable member 80a. Here, the inner sealing member 60a is allowed to move within the inner sealing groove 41 by elastic deformation of the inner sealing deformable member 80a.

[0048] An oil supply channel 81b is connected to the bottom surface of the outer sealing groove 42, through which external sealing oil Ob2 is supplied to the outer sealing groove 42. On the bottom surface of the outer sealing groove 42, the oil supply channel 81b is kept blocked by the external sealing deformable member 80b. The external sealing oil Ob2 supplied from the oil supply channel 81b to the outer sealing groove 42 generates a force (hereinafter referred to as "pressing force F2") that presses the outer sealing member 60b against the band 13b via the external sealing deformable member 80b. Here, the elastic deformation of the external sealing deformable member 80b allows the outer sealing member 60b to move within the outer sealing groove 42.

[0049] The pressing force F1 can be greater than the pressing force F2. As a result, the inner seal 60a can be easily pressed against the belts 13a and 13b, thereby preventing the pressurizing oil Op contained in the pressurizing chamber 21 from leaking between the inner seal 60a and the belts 13a and 13b.

[0050] An inner oil supply port 43a for supplying inner sealing oil Os1 to the inner sealing groove 41 is formed on the side wall surface of the partition wall portion 43, which forms part of the inner sealing groove 41. An oil supply channel 43b formed inside the partition wall portion 43 is connected to the inner oil supply port 43a. The oil supply channel 43b is connected to the aforementioned oil supply pipe 31 (the oil supply pipe 31 that supplies sealing oil Os).

[0051] like Figure 4 As shown, the inner sealing oil Os1 supplied from the inner oil supply port 43a to the inner sealing groove 41 mainly accumulates in the inner sealing groove 41, or accumulates in the space formed between the front end of the partition wall portion 43 and the belt 13b (or belt 13a), or flows into the inner sealing oil flow channel 71 described later. The oil supply channel 43b flows from the inner oil supply port 43a in an inclined direction toward the belt 13b ( Figure 4 The inner sealing oil Os1 is supplied from the right-sloping upper direction. By forming the oil supply channel 43b in this way, the inner sealing oil Os1 can be smoothly supplied from the inner oil supply port 43a to the inner sealing groove 41.

[0052] An internal sealing oil flow channel 71 for the flow of internal sealing oil Os1 is formed inside the internal seal 60a. An oil suction port 71a is formed at one end of the internal sealing oil flow channel 71, and an oil spray outlet 71b is formed at the other end. The oil suction port 71a faces the sidewall of the partition wall portion 43 where the inner oil supply port 43a is formed. The internal sealing oil Os1 supplied from the inner oil supply port 43a to the inner sealing groove 41 is drawn into the internal sealing oil flow channel 71 through the oil suction port 71a. The internal sealing oil Os1 through the internal sealing oil flow channel 71 is sprayed out from the oil spray outlet 71b toward the belt 13b (or belt 13a). As a result, a layer of internal sealing oil Os1 is formed between the internal seal 60a and the belt 13b (or belt 13a). Through this layer, leakage of the pressurizing oil Op in the pressurizing chamber 21 to the outside of the pressurizing chamber 21 can be prevented.

[0053] On the inner seal 60a, multiple inner sealing oil flow channels 71 (oil inlet 71a and oil outlet 71b) are formed at multiple different locations. Similarly, on the partition wall portion 43, multiple oil supply channels 43b are formed at multiple different locations. As described above, by forming oil outlets 71b at multiple locations on the inner seal 60a, a layer of inner sealing oil Os1 can be formed on the entire surface of the inner seal 60a opposite to the band 13b (or band 13a).

[0054] Figure 5 It means Figure 2 A schematic diagram of section B1-B1 or section B2-B2, mainly showing the structure for supplying external sealing oil Os2 to the external sealing groove 42. For example... Figure 5 As shown, an outer oil supply port 43c for supplying outer sealing oil Os2 to the outer sealing groove 42 is formed on the side wall surface of the partition wall portion 43, which forms part of the outer sealing groove 42. An oil supply channel 43d formed inside the partition wall portion 43 is connected to the outer oil supply port 43c. The oil supply channel 43d is connected to the aforementioned oil supply pipe 31 (the oil supply pipe 31 for supplying outer sealing oil Os2).

[0055] like Figure 5 As shown, the outer sealing oil Os supplied from the outer oil supply port 43c to the outer sealing groove 42 mainly accumulates in the outer sealing groove 42, or accumulates in the space formed between the front end of the partition wall portion 43 and the band 13b (or band 13a), or flows into the outer sealing oil flow channel 72 described later. The oil supply channel 43d flows from the outer oil supply port 43c in an inclined direction toward the band 13b ( Figure 5 The external sealing oil Os2 is supplied from the upper left side. By forming the oil supply channel 43d in this way, the external sealing oil Os2 can be smoothly supplied from the outer oil supply port 43c to the outer sealing groove 42.

[0056] An external sealing oil flow channel 72 for the flow of external sealing oil Os2 is formed inside the external seal 60b. An oil suction port 72a is formed at one end of the external sealing oil flow channel 72, and an oil spray outlet 72b is formed at the other end. The oil suction port 72a faces the sidewall of the partition wall portion 43 where the outer oil supply port 43c is formed. The external sealing oil Os2 supplied from the outer oil supply port 43c to the outer sealing groove 42 is drawn into the external sealing oil flow channel 72 through the oil suction port 72a. The external sealing oil Os2 is sprayed from the oil spray outlet 72b into the belt 13b (or belt 13a) through the external sealing oil flow channel 72. As a result, a layer of external sealing oil Os2 is formed between the external seal 60b and the belt 13b (or belt 13a). Through this layer, leakage of pressurizing oil Op in the pressurizing chamber 21 to the outside of the pressurizing chamber 21 is prevented.

[0057] On the outer seal 60b, multiple outer sealing oil flow channels 72 (oil inlet 72a and oil outlet 72b) are formed at multiple different locations. Similarly, on the partition wall portion 43, multiple oil supply channels 43d are formed at multiple different locations. As described above, by forming the oil outlet 72b at multiple locations on the outer seal 60b, a layer of outer sealing oil Os2 can be formed on the entire surface of the outer seal 60b opposite to the band 13b (or band 13a).

[0058] Figure 6 It means Figure 2 A schematic diagram of section C1-C1 or section C2-C2 mainly illustrates the structure for recovering the inner sealing oil Os1 supplied to the inner sealing groove 41 and the outer sealing oil Os2 supplied to the outer sealing groove 42. For example... Figure 6 As shown, an oil recovery port 43e for recovering inner sealing oil Os1 and outer sealing oil Os2 is formed on the front end face of the partition wall portion 43 opposite to the 13b. The oil recovery port 43e recovers the inner sealing oil Os1 and outer sealing oil Os2 accumulated in the space formed between the inner seal 60a and the outer seal 60b. In addition, an oil recovery channel 43f connected to the oil recovery port 43e is formed inside the partition wall portion 43. The oil flowing from the oil recovery port 43e into the oil recovery channel 43f is guided to the aforementioned oil discharge pipe 32 (see reference). Figure 1 ).

[0059] Figure 7 This is a diagram showing the sealing part 40 as viewed from the side with sections 13a and 13b. Figure 7 The image shows an inner seal 60a disposed in the inner sealing groove 41 and an outer seal 60b disposed in the outer sealing groove 42.

[0060] like Figure 7 As shown, the oil spray outlet 71b formed in the inner seal 60a extends along the length direction of the inner seal 60a, and the inner sealing oil Os1 sprayed from the oil spray outlet 71b forms a layer between the inner seal 60a and the belts 13a and 13b. The inner seal 60a is formed into a rectangular shape along the outer edge of the pressure chamber 21 in the XY plane, and is composed of a portion extending in the X direction and a portion extending in the Y direction. In the portion extending in the X direction, the oil spray outlet 71b extends in the X direction, and in the portion extending in the Y direction, the oil spray outlet 71b extends in the Y direction.

[0061] like Figure 7 As shown, the oil spray outlet 72b formed on the outer seal 60b extends along the length of the outer seal 60b, and the sealing oil Os2 sprayed from the oil spray outlet 72b forms a layer between the outer seal 60b and the belts 13a and 13b. The outer seal 60b is formed into a rectangular shape along the outer edge of the pressure chamber 21 in the XY plane, and is composed of a portion extending along the X direction and a portion extending along the Y direction. In the portion extending along the X direction, the oil spray outlet 72b extends along the X direction, and in the portion extending along the Y direction, the oil spray outlet 72b extends along the Y direction.

[0062] If used Figure 2 as well as Figures 4 to 6As explained, the inner oil supply port 43a, the outer oil supply port 43c, and the oil recovery port 43e are located at different positions in the partition wall portion 43. Furthermore, the total number of inner oil supply ports 43a, the total number of outer oil supply ports 43c, and the total number of oil recovery ports 43e can be appropriately determined. Here, it is possible to have a greater total number of inner oil supply ports 43a than the total number of outer oil supply ports 43c.

[0063] The inner seal 60a and the outer seal 60b can each be composed of a single component (seal) or multiple components (sub-seals). Figure 8 The diagram shows an example where the inner seal 60a and the outer seal 60b are each composed of two components (a first auxiliary seal 61 and a second auxiliary seal 62). Alternatively, at least one of the inner seal 60a and the outer seal 60b may be composed of two components (a first auxiliary seal 61 and a second auxiliary seal 62). Figure 9 From Figure 8 A schematic diagram of the first and second seals 61 when viewed in the direction of arrow D3 (Z direction).

[0064] exist Figure 8 and Figure 9 In this design, the first sealing element 61 and the second sealing element 62 are interconnected to form an inner sealing element 60a or an outer sealing element 60b. Specifically, an opening 61a is formed in the first sealing element 61, and a pin 62a passes through the opening 61a. Both ends of the pin 62a are fixed to the second sealing element 62. A gap is formed between the outer peripheral surface of the pin 62a and the inner peripheral surface of the opening 61a, allowing the pin 62a to move within the space formed inside the opening 61a. Here, the outer diameter of the opening 61a is larger than the outer diameter of the pin 62a.

[0065] It can also be used Figure 10 The structure shown is used to replace Figure 9 The structure shown. In Figure 10 In the structure shown, the ends of the first secondary seal 61 and the second secondary seal 62 overlap, and the pin 62a passes through the ends of both seals. Furthermore, an opening 61a is formed at the end of the first secondary seal 61, and the pin 62a is located inside the opening 61a. Figure 10 In the structure shown, it is also related to Figure 9 Similarly, in the structure shown, a gap is formed between the outer peripheral surface of the pin 62a and the inner peripheral surface of the opening 61a, allowing the pin 62a to move within the space formed inside the opening 61a.

[0066] By forming a gap between the pin 62a and the opening 61a, the first and second sealing elements 61 and 62 can be displaced relative to each other in the Z direction, or relative to each other in the X or Y direction. Thus, as... Figure 8 As shown, the dead zone S formed between the upper inner seal 60a (or outer seal 60b) and the belt 13a, and between the lower inner seal 60a (or outer seal 60b) and the belt 13b, can be reduced, thus suppressing leakage of sealing oil Os (inner sealing oil Os1, outer sealing oil Os2) from the dead zone S. This will be explained in detail below.

[0067] exist Figure 8 In the example shown, a product P sandwiched between a pair of first-stage seals 61 arranged vertically is moved between them. Here, various products P with different thicknesses (length in the Z direction) are sometimes used as product P. Therefore, when the thickness of product P changes, the deformation state of the straps 13a and 13b when product P is sandwiched is as follows (refer to...). Figure 8 ) has changed.

[0068] Here, with the first and second seals 61 integrally formed, it is difficult to track the deformation of the bands 13a and 13b when the product P is clamped. Moreover, the thicker the product P, the more likely the dead zone S will become larger, and the sealing oil Os (inner sealing oil Os1 and outer sealing oil Os2) may leak from the dead zone S.

[0069] On the other hand, in the structure that causes the first and second auxiliary seals 61 to shift relative to each other, the first and second auxiliary seals 61 and 62 can follow the deformation of the belts 13a and 13b when the product P is clamped, thus suppressing the increase of the dead zone S. For example, when the thickness of the product P increases, the first auxiliary seal 61 moves away from the product P relative to the second auxiliary seal 62 ( Figure 7 The second seal 62 is shifted (above or below) and remains close to the state of the seals 13a and 13b. This can suppress the increase of the dead zone S and prevent leakage of the sealing oil Os (inner sealing oil Os1 and outer sealing oil Os2) caused by the increase of the dead zone S.

[0070] The product P direction sandwiched between 13a and 13b Figure 8 When the paper is conveyed in a direction orthogonal to the paper surface, the connecting portion of the first sealing element 61 and the second sealing element 62 can be positioned in the width direction corresponding to the product P. Figure 1The position of the end in the Y direction (as shown). As described above, the inner seal 60a (or outer seal 60b) is formed in a rectangular shape in the XY plane, and is therefore composed of a portion extending in the X direction and a portion extending in the Y direction. Therefore, in the portion extending in the Y direction of the inner seal 60a (or outer seal 60b), a connecting portion of the first secondary seal 61 and the second secondary seal 62 can be provided.

[0071] Here, the connection portion of the first auxiliary seal 61 and the second auxiliary seal 62 can be provided at a position corresponding to at least one of the two ends in the width direction of the product P. Furthermore, when using multiple products P with different widths, the connection portion of the first auxiliary seal 61 and the second auxiliary seal 62 can be provided at multiple locations in a manner corresponding to the width of each of the multiple products P. That is, in the portion extending along the Y direction in the inner seal 60a (or outer seal 60b), the connection portion of the first auxiliary seal 61 and the second auxiliary seal 62 can be provided at multiple locations. Additionally, when the connection portion of the first auxiliary seal 61 and the second auxiliary seal 62 is provided at multiple locations, the inner seal 60a (or outer seal 60b) is naturally composed of three or more auxiliary seals.

[0072] On the other hand, in the product P direction sandwiched between 13a and 13b Figure 8 In the case of conveying in the left and right directions, the connecting part of the first set of seals 61 and the second set of seals 62 can be set in the conveying direction of product P ( Figure 1 Any position in the X direction (as shown). That is, in the portion extending in the X direction of the inner seal 60a (or outer seal 60b), the connection portion of the first secondary seal 61 and the second secondary seal 62 can be provided at one or more locations. Even in this case, during the conveying of product P via belts 13a and 13b, the increase of the dead space S can be suppressed.

[0073] exist Figure 8 In the example shown, the inner seal 60a (or outer seal 60b) located above the band 13a and the inner seal 60a (or outer seal 60b) located below the band 13b are constituted by the first set of seals 61 and the second set of seals 62, but this is not a limitation. Specifically, it is possible to constitute only the inner seal 60a (or outer seal 60b) located above the band 13a by the first set of seals 61 and the second set of seals 62, or to constitute only the inner seal 60a (or outer seal 60b) located below the band 13b by the first set of seals 61 and the second set of seals 62.

[0074] In this embodiment, the first secondary seal 61 is shifted relative to the second secondary seal 62 in the Z direction, or in the X or Y direction, but it is not limited to this. Considering the thickness of the product P, it is sufficient to shift the first secondary seal 61 relative to the second secondary seal 62 in the Z direction. In this case, an elongated hole extending in the Z direction can be used as the opening 61a, and a guide pin 62a can be guided along the elongated hole in the Z direction.

[0075] In this embodiment, the first secondary seal 61 and the second secondary seal 62 are displaced relative to each other by using the pin 62a and the opening 61a, but this is not a limitation. As described above, any structure that allows relative displacement can be used as long as it enables the first secondary seal 61 and the second secondary seal 62 to be displaced relative to each other.

[0076] Symbol Explanation

[0077] 1: Double-belt press; 13a, 13b: belt; 21: pressure chamber; 40: sealing part; 41: inner sealing groove; 42: outer sealing groove; 43: partition wall part; 43b, 43d: oil supply channel; 43e: oil recovery port; 43f: oil recovery channel; 50: wiper; 60a: inner seal; 60b: outer seal; 61: first set of seals; 62: second set of seals; 80a: deformable part for inner seal; 80b: deformable part for outer seal; P: product; Op: pressurizing oil; Os: sealing oil; Os1: inner sealing oil; Os2: outer sealing oil; Ob: force-applying oil; Ob1: inner sealing force-applying oil; Ob2: outer sealing force-applying oil.

Claims

1. A double-belt press, wherein a product is conveyed by a pair of belts clamping it in one operation, and the product is pressurized by a pressurizing fluid contained in a pressurizing chamber, characterized in that, The dual-belt press has a sealing part, which is disposed along the outer edge of the pressure chamber and seals the pressure chamber. The sealing part includes: An inner seal is housed in an inner sealing groove, and the inner seal has an inner sealing flow channel therein, the inner sealing flow channel having at both ends: an intake port for drawing in sealing fluid supplied to the inner sealing groove; and an outlet for spraying the sealing fluid drawn in from the intake port toward the belt. An outer seal is housed in an outer sealing groove, the outer sealing groove being located further away from the pressure chamber than the inner sealing groove. The outer seal has an outer sealing flow channel internally, the outer sealing flow channel having at both ends: an intake port for drawing in sealing fluid supplied to the outer sealing groove; and an outlet for ejecting the sealing fluid drawn in from the intake port toward the belt; and... A partition wall is formed between the inner sealing groove and the outer sealing groove. The partition wall is provided with a plurality of fluid supply channels and a plurality of fluid recovery channels at different positions along the outer edge of the pressurization chamber. The plurality of fluid supply channels supply the sealing fluid to each of the inner sealing groove and the outer sealing groove, and the plurality of fluid recovery channels recover the sealing fluid accumulated in the space formed between the inner seal and the outer seal.

2. The dual-belt press according to claim 1, characterized in that, include: An internal sealing deformable component is disposed between the bottom surface of the internal sealing groove and the internal sealing element, and is elastically deformable; as well as An external sealing deformable component is disposed between the bottom surface of the external sealing groove and the external sealing element, and is elastically deformable. The deformable member for the inner seal is subjected to pressure from fluid supplied from the bottom surface of the inner seal groove, which forces the inner seal against the belt. The deformable member for the outer seal is subjected to pressure from fluid supplied from the bottom surface of the outer seal groove, which applies force to the outer seal member against the belt. The force applied to the inner seal on the belt is greater than the force applied to the outer seal on the belt.

3. The dual-belt press according to claim 1 or 2, characterized in that, The fluid supply channel that supplies the sealing fluid to the inner sealing groove supplies the sealing fluid from the side of the spacer wall portion that forms part of the inner sealing groove in an inclined direction toward the belt.

4. The dual-belt press according to claim 1 or 2, characterized in that, The fluid supply channel that supplies the sealing fluid to the outer sealing groove supplies the sealing fluid from the side of the spacer wall portion that forms part of the outer sealing groove in an inclined direction toward the belt.

5. The dual-belt press according to claim 1 or 2, characterized in that, include: The wiper is positioned along the outer edge of the pressure chamber, further away from the pressure chamber than the seal, and is pressed against the surface of the belt.

6. The dual-belt press according to claim 5, characterized in that, A recovery port for recovering the sealing fluid is provided between the sealing part and the wiper.

7. The dual-belt press according to claim 1 or 2, characterized in that, At least one of the inner seal and the outer seal is composed of a first set of seals and a second set of seals connected to each other. The first and second auxiliary seals are movable in the direction in which the product is clamped by the pair of straps.

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