Continuous isostatic pressing hot press for preparing CCM

Abstract

The invention discloses a continuous isostatic pressing hot press for preparing CCM, and relates to the technical field of hot press equipment, the continuous isostatic pressing hot press comprises an upper pressing module, a lower pressing module, an oil scraping assembly, a press base, a pressing plate assembly and a press fixing support; the pressing machine fixing support is installed on the pressing machine base, the upper pressing module and the lower pressing module are both installed on the pressing machine fixing support, and the upper pressing module and the lower pressing module are both provided with the oil scraping assemblies. The upper pressing module comprises an upper steel belt, the lower pressing module comprises a lower steel belt, the oil scraping assembly comprises an upper oil scraping plate and a lower oil scraping plate, and the pressing plate assembly comprises an upper pressing plate and a lower pressing plate; the upper pressing plate is located on the inner side of the upper steel belt, the lower pressing plate is located on the inner side of the lower steel belt, the upper oil scraping plate is arranged on the upper pressing plate, and the lower oil scraping plate is arranged on the lower steel belt. According to the invention, two combination modes of vacuum oil absorption and laser oil removal are set for oil removal, so that the oil removal effect is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hot press equipment, in particular to a continuous isostatic hot press for preparing CCM. Background Art

[0002] In the continuous isostatic pressing production of CCM (catalyst coated membrane), there is a risk of contamination of the CCM membrane during production due to the fact that a small amount of oil is used for lubrication in the seal between the pressing plate and the steel belt of the continuous isostatic hot press.

[0003] Therefore, it is necessary to design a continuous isostatic hot pressing machine that can solve the above problems. Summary of the Invention

[0004] The present invention aims to solve the problems in the prior art and provides a continuous isostatic hot press for preparing CCM.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: The cam is provided with an upper and a lower pressing plate, and the lower pressing plate is provided with an upper and a lower pressing plate, and the lower pressing plate is provided with an upper and a lower pressing plate.

[0006] Based on the above technical solution, further, the upper pressing module also includes an upper pressing roller assembly, the upper pressing roller assembly is composed of two upper pressing rollers, and the two upper pressing rollers are respectively located at both ends of the upper steel belt.

[0007] Based on the above technical solution, further, two press fixing brackets are provided, and an upper pressing roller is installed on the top of each press fixing bracket.

[0008] Based on the above technical solution, further, the lower pressing module includes a lower pressing roller assembly, the lower pressing roller assembly is composed of two lower pressing rollers, and the two lower pressing rollers are respectively located at both ends of the lower steel belt.

[0009] Based on the above technical solution, further, a lower pressing roller is installed on each of the press fixing brackets, and the upper pressing roller is located above the lower pressing roller.

[0010] Based on the above technical solution, further, the upper oil scraping plates are provided with two groups, one group is provided at the feeding end of the upper pressing plate, and the other group is provided at the discharging end of the upper pressing plate.

[0011] Based on the above technical solution, further, the oil scraper assembly also includes a mounting bracket, and two groups of mounting brackets are provided, and the two groups of mounting brackets are respectively provided at both ends of the upper oil scraper plate and the lower oil scraper plate.

[0012] Based on the above technical solution, further, the upper oil scraper plate and the lower oil scraper plate are both connected to the mounting brackets at both ends through connecting brackets.

[0013] Based on the above technical solution, further, the upper oil scraper plate and the lower oil scraper plate are respectively provided with pin holes, and a guide pin is installed in the pin holes of the upper oil scraper plate and the pin holes of the lower oil scraper plate, and a threaded hole is provided inside the guide pin, and a screw is installed in the threaded hole. The upper oil scraper plate and the lower oil scraper plate are connected by the joint action of the guide pin and the screw.

[0014] Based on the above technical solution, further, a first connecting hole is provided at the end of the upper scraper plate, and a first waist hole is provided at the position of the connecting bracket, and the aperture of the first waist hole is larger than the aperture of the first connecting hole, and the upper scraper plate is connected to the connecting bracket by providing a first fixing member passing through the first connecting hole and the first waist hole.

[0015] Based on the above technical solution, further, a second connecting hole is provided at the end of the lower scraper plate, and a second waist hole is provided at the position of the connecting bracket, and the aperture of the second waist hole is also larger than the aperture of the second connecting hole, and the upper scraper plate is connected to the connecting bracket by providing a second fixing part passing through the second connecting hole and the second waist hole.

[0016] Based on the above technical solution, further, the upper oil scraper plate includes an oil suction body, a rear sealing plate, a rubber scraper strip and a rubber strip pressure plate. The rear sealing plate is installed on one side of the oil suction body, the rubber scraper strip is installed on the other side of the oil suction body, and a rubber strip pressure plate is fixedly installed on the outside of the rubber scraper strip.

[0017] Based on the above technical solution, further, an oil suction cavity is provided inside the oil suction body, and a vacuum oil suction hole is provided on the outer surface of the oil suction body, which is connected to the inside of the oil suction cavity. Vacuum oil suction pipes are also installed at both ends of the oil suction body, which are connected to the inside of the oil suction cavity.

[0018] Based on the above technical solution, further, a coil unloading area is provided on the same side of the upper pressing module and the lower pressing module, and the transfer film coil, proton membrane coil and release film coil are placed in the coil unloading area.

[0019] Based on the above technical solution, further, a group of laser non-destructive oil removal components are respectively provided on the same side of the upper pressure roller assembly and the lower pressure roller assembly.

[0020] Based on the above technical solution, further, an upper smoke collecting device is further provided on one side of the upper pressing roller assembly, and a lower smoke collecting device is further provided on one side of the lower pressing roller assembly.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a plurality of upper and lower oil scrapers on a continuous isostatic press. Two sets of upper oil scrapers are provided at the feed and discharge ends of the upper press plate, and two sets of lower oil scrapers are provided at the lower steel belt. These scrapers can be used to remove a small amount of oil generated during the operation of the press and oil dripping from the lower belt. A release film provided in the coil area isolates the steel belt from the catalyst coated membrane, thereby preventing the catalyst coated membrane (CCM) from being contaminated by oil during production.

[0022] (2) The present invention sets up two combined methods of vacuum oil suction and laser oil removal for oil removal. Among them, vacuum oil suction is mainly used to remove oil from the inner side of the upper steel belt and the lower steel belt, and laser oil removal is mainly used to remove oil from the outer side of the upper steel belt and the lower steel belt, which greatly improves the oil removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A simplified diagram of the overall structure of the continuous isostatic hot press of the present invention; Figure 2 for Figure 1 This is a side view without a coil unloading area; Figure 3 This is a schematic structural diagram of the oil scraping assembly in the pressing process of the present invention; Figure 4 for Figure 3 Schematic diagram of part of the structure; Figure 5 A cross-sectional view of the oil scraper of the present invention; Figure numerals: 1. Press base; 2. Press fixing bracket; 3. Upper pressing roller; 4. Lower pressing roller; 5. Upper steel belt; 6. Lower steel belt; 7. Upper pressing plate; 8. Lower pressing plate; 9. Upper scraper; 10. Lower scraper; 11. Coil discharge area; 12. Laser non-destructive oil removal component; 13. Upper smoke collecting device; 14. Lower smoke collecting device; 15. Mounting bracket; 16. Connecting bracket; 17. Screw; 18. First waist hole; 19. Second waist hole; 20. Oil suction body; 21. Rear sealing plate; 22. Rubber scraper strip; 23. Rubber strip pressing plate; 24. Vacuum oil suction pipe; 25. Oil suction cavity. DETAILED DESCRIPTION

[0024] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention may be combined accordingly without conflict.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. The technical features in the various embodiments of the present invention can be combined accordingly without conflicting with each other.

[0026] In the description of the present invention, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or indirectly connected, that is, there are intermediate elements. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0027] In the description of the present invention, it should be understood that the terms "upper," "lower," "first," and "second" are used solely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being described. Therefore, a feature defined as "upper," "lower," "first," or "second" may explicitly or implicitly include at least one such feature.

[0028] Example Combine Figure 1-Figure 5As shown, this embodiment provides a continuous isostatic hot press for preparing CCM, which includes an upper pressing module, a lower pressing module, an oil scraping assembly, a press base 1, a pressing plate assembly and a press fixed bracket 2; a coil discharge area 11 is also provided on the same side of the upper pressing module and the lower pressing module, the bottom of the press fixed bracket 2 is installed on the press base 1, and the upper pressing module and the lower pressing module are both installed on the press fixed bracket 2, with the upper pressing module located above the lower pressing module. At the same time, an oil scraping assembly is installed on both the upper pressing module and the lower pressing module. It should be noted that Figure 3 The arrow perpendicular to the scraper assembly indicates the direction of movement of the steel belt, and the arrow parallel to the scraper assembly indicates that the oil gathers on both sides along the rubber scraper strip.

[0029] Specifically, the coil unloading area 11 can accommodate transfer film coils, proton membrane coils, and release film coils. Preferably, multiple supports for supporting each coil can be provided in the coil unloading area 11, with each corresponding support being provided with a corresponding coil. The free ends of the transfer film coils, proton membrane coils, and release film coils are positioned between the upper and lower press modules. It should be noted that the release film coils provided in the coil unloading area 11 can isolate the upper and lower steel strips 5, 6 from the catalyst coated membrane, thereby ensuring that the catalyst coated membrane (CCM) located between the upper and lower steel strips 5, 6 is not contaminated by oil during production.

[0030] The upper pressing module includes an upper pressing roller assembly and an upper steel belt 5. The upper pressing roller assembly is composed of two upper pressing rollers 3, and the two upper pressing rollers 3 are respectively located at both ends of the upper steel belt 5, that is, the upper steel belt 5 is sleeved on the two upper pressing rollers 3 to form the upper pressing module. Figure 1 As shown, two independent press fixing brackets 2 are provided, and an oil scraping assembly is provided between the two press fixing brackets 2 , wherein an upper pressing roller 3 is installed on the top of each press fixing bracket 2 .

[0031] The press module includes a lower press roller assembly and a lower steel belt 6. The lower press roller assembly consists of two lower press rollers 4, and the two lower press rollers 4 are respectively located at the two ends of the lower steel belt 6. In other words, the lower steel belt 6 is sleeved on the two lower press rollers 4 to form the press module. Similarly, each press fixed bracket 2 is also equipped with a lower press roller 4, and the upper press roller 3 is located above the lower press roller 4.

[0032] In this embodiment, the pressure plate assembly includes an upper pressure plate 7 and a lower pressure plate 8. The upper pressure plate 7 is located on the inner side of the upper steel belt 5, and the lower pressure plate 8 is located on the inner side of the lower steel belt 6. The upper steel belt 5 and the lower steel belt 6 are both passed through the upper pressure plate 7 and the lower pressure plate 8 for pressing, and both ends of the upper pressure plate 7 and the lower pressure plate 8 are connected to the press fixed bracket 2 set on both sides, wherein the upper pressure plate 7 is located above the lower pressure plate 8.

[0033] The oil scraping assembly includes an upper oil scraper 9 and a lower oil scraper 10. Preferably, two sets of upper oil scrapers 9 and lower oil scrapers 10 are provided, wherein the two sets of upper oil scrapers 9 are respectively provided at the inlet end and the outlet end of the upper pressing plate 7, and the two sets of lower oil scrapers 10 are both provided on the lower steel belt 6. Specifically, the lower oil scrapers 10 provided on the lower steel belt 6 can be used to remove a small amount of oil generated during the operation of the press and the oil dripping from the bottom.

[0034] Furthermore, the oil scraper assembly also includes two mounting brackets 15, wherein the mounting brackets 15 are provided in two sets, and the two sets of mounting brackets 15 are arranged at both ends of the upper oil scraper plate 9 and the lower oil scraper plate 10. Specifically, the upper oil scraper plate 9 and the lower oil scraper plate 10 are connected to the mounting brackets 15 at both ends via connecting brackets 16, and the connecting brackets 16 can be configured as L-shaped. The upper scraper plate 9 and the lower scraper plate 10 are both provided with pin holes, which are connected by guide pins and screws 17 installed in the pin holes. Specifically, the guide pins pass through the corresponding pin holes on the upper scraper plate 9 and the lower scraper plate 10, and the guide pins are provided with threaded holes for installation inside. The screws 17 are installed in the threaded holes. The loosening and tightening action of the screws 17 drives the loosening and tightening action of the guide pins, thereby adjusting the oil scraping gap between the upper scraper plate 9 and the lower scraper plate 10. The end of the upper scraper plate 9 is provided with a first connecting hole, and the position of the corresponding connecting bracket 16 is provided with a first waist hole 18. The aperture of the first waist hole 18 is larger than the aperture of the first connecting hole. The upper scraper plate 9 is connected to the lower scraper plate 10 by the first fixing member passing through the first connecting hole and the first waist hole 18. The scraper plate 9 is connected to the connecting bracket 16; similarly, a second connecting hole is provided at the end of the lower scraper plate 10, and a second waist hole 19 is provided at the position of the corresponding connecting bracket 16, and the aperture of the second waist hole 19 is also larger than the aperture of the second connecting hole, and the upper scraper plate 9 and the connecting bracket 16 are connected by a second fixing member passing through the second connecting hole and the second waist hole 19. It should be noted that the first fixing member and the second fixing member can both be bolts; therefore, when adjusting the size of the gap between the upper scraper plate 9 and the lower scraper plate 10, fixation and adjustment can be achieved through the characteristics of the first waist hole 18 and the second waist hole 19. Preferably, the long sections of the first waist hole 18 and the second waist hole 19 are arranged in the vertical direction. The operation process is as follows: since the upper scraper plate 9 contacts the inner side of the upper steel belt 5, the structure of the upper scraper plate 9 may be worn to a certain extent during the operation of the upper steel belt 5. Similarly, since the lower scraper plate 10 contacts the inner side of the lower steel belt 6, the structure of the lower scraper plate 10 may be worn to a certain extent during the operation of the lower steel belt 6. Therefore, it is only necessary to regularly adjust the gap according to the wear conditions.

[0035] In this embodiment, the upper scraper plate 9 and the lower scraper plate 10 have the same structure. The structure of the upper scraper plate 9 is taken as an example, and the specific structure of the lower scraper plate 10 is not repeated. Specifically, the upper scraper plate 9 includes an oil suction body 20, a rear sealing plate 21, a rubber scraper strip 22, and a rubber strip pressure plate 23. Specifically, an oil suction cavity 25 is provided inside the oil suction body 20, and a vacuum oil suction hole is provided on the outer surface of the oil suction body 20, which is connected to the interior of the oil suction cavity 25, and vacuum oil suction pipes 24 are installed at both ends of the oil suction body 20, which are connected to the interior of the oil suction cavity 25; the rear sealing plate 21 is installed on one side of the oil suction body 20; preferably, the oil suction body 20, the vacuum oil suction pipe 24 and the rear sealing plate 21 can be combined into one by welding to ensure that there will be no air leakage and oil leakage.

[0036] Furthermore, a rubber scraper strip 22 is fixed on one side of the oil suction body 20, wherein the rubber scraper strip 22 and the rear sealing plate 21 are located on different sides of the oil suction body 20, and a rubber strip pressure plate 23 is fixedly installed on the outside of the rubber scraper strip 22. When the vacuum oil suction pipe 24 is connected to the vacuum port of the external vacuum pump, it can ensure that the negative pressure on both sides of the upper scraper plate 9 is maximized, and the oil on the inner sides of both sides of the upper steel belt 5 is sucked away through the vacuum oil suction hole as much as possible.

[0037] The working principle of the oil scraper assembly is: The upper and lower scraper plates 9 and 10 can adjust the upper and lower gaps between the two groups of scraper plates by adjusting the states of the screws 17 and the guide pins to ensure that the rubber scraper strips 22 on the upper and lower scraper plates 9 and 10 are tightly fitted to the inner sides of the upper steel belt 5 and the lower steel belt 6, and the guide pins arranged between the upper and lower scraper plates 9 and 10 can ensure that the upper and lower scraper plates 9 and 10 can make the rubber scraper strips 22 contact perpendicularly to the upper and lower steel belts 5 and 6. When the upper and lower steel belts 5 and 6 move, the sealing lubricating oil will gather on both sides of the rubber scraper strips 22 under the action of the upper and lower steel belts 5 and 6. At the same time, the vacuum oil suction holes of the upper and lower scraper plates 9 and 10 suck away the oil and discharge it to the outside of the lower steel belt 6.

[0038] In some other embodiments, a group of laser non-destructive oil removal components 12 can be provided on one side of the upper pressure roller assembly and the lower pressure roller assembly respectively. The laser non-destructive oil removal component 12 includes a laser and an infrared thermal imager. Specifically, a flat-top spot field lens (energy distribution is uniform to avoid local overburning) and a green laser (532nm) are used to further effectively remove oil stains on the outer contact surface of the product. In addition, an infrared thermal imager is used to monitor and adjust the laser emission power in real time, so that the surface temperature of the upper steel strip 5 and the lower steel strip 6 are both less than 300°C.

[0039] The laser focus is then adjusted to a position 0.01-0.02 mm above the surface of the corresponding upper or lower steel strip 5 or 6. The specific value is determined based on oil stain thickness testing. The laser's dynamic focusing system (0.001 mm accuracy) ensures that the energy density reaches its peak within the oil stain layer while the energy on the substrate surface decays to a safe threshold. An external infrared thermal imager monitors and adjusts the laser generator power in real time. This rapidly vaporizes the oil stains on the outer surfaces of the upper and lower steel strips 5 and 6. When the laser beam reaches the steel strip surface, the spot diffuses, and the energy density falls below the metal damage threshold. Energy density is calculated as: laser power / (scanning speed × spot diameter), where energy density is measured in J / cm², laser power is measured in W, scanning speed is measured in m / s, and spot diameter is measured in mm. This allows for precise control of the laser's energy density.

[0040] In some other embodiments, an upper smoke collector 13 is further provided on one side of the upper roller assembly, and a lower smoke collector 14 is further provided on one side of the lower roller assembly. It should be noted that the upper smoke collector 13 and the lower smoke collector 14 can be mounted adjacent to (but not in direct contact with) the upper and lower roller assemblies, respectively, via a supporting structure such as a mounting bracket (not shown). When the laser non-destructive oil removal assembly 12 degreases the outer surfaces of the upper and lower steel strips 5, 6, the resulting smoke and other pollutants can be collected by the upper and lower smoke collectors 13, 14, respectively, thereby reducing the degree of environmental pollution.

[0041] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A continuous isostatic hot press for preparing CCM, characterized in that: It includes an upper pressing module, a lower pressing module, an oil scraping assembly, a press base, a pressing plate assembly and a press fixing bracket; The bottom of the press fixing bracket is installed on the press base, the upper pressing module and the lower pressing module are both installed on the press fixing bracket, the upper pressing module is located above the lower pressing module, and the oil scraping assembly is installed on the upper pressing module and the lower pressing module; The upper pressing module includes an upper steel belt, the lower pressing module includes a lower steel belt, the oil scraping assembly includes an upper oil scraping plate and a lower oil scraping plate, and the pressing plate assembly includes an upper pressing plate and a lower pressing plate, and both ends of the upper pressing plate and the lower pressing plate are connected to the press fixing brackets provided on both sides; The upper pressing plate is located on the inner side of the upper steel belt, the lower pressing plate is located on the inner side of the lower steel belt, the upper scraping plate is arranged on the upper pressing plate, and the lower scraping plate is arranged on the lower steel belt.

2. A continuous isostatic hot press for preparing CCM according to claim 1, characterized in that: The upper pressing module further includes an upper pressing roller assembly, which is composed of two upper pressing rollers, and the two upper pressing rollers are respectively located at the two ends of the upper steel belt.

3. A continuous isostatic hot press for preparing CCM according to claim 2, characterized in that: There are two press fixing brackets, and an upper pressing roller is installed on the top of each press fixing bracket.

4. A continuous isostatic hot press for preparing CCM according to claim 3, characterized in that: The lower pressing module includes a lower pressing roller assembly, which is composed of two lower pressing rollers, and the two lower pressing rollers are respectively located at the two ends of the lower steel belt.

5. A continuous isostatic hot press for preparing CCM according to claim 4, characterized in that: A lower pressing roller is also installed on each of the press fixing brackets, and the upper pressing roller is located above the lower pressing roller.

6. A continuous isostatic hot press for preparing CCM according to claim 1, characterized in that: The upper oil scraping plates are provided with two groups, one group is arranged at the feeding end of the upper pressing plate, and the other group is arranged at the discharging end of the upper pressing plate.

7. A continuous isostatic hot press for preparing CCM according to claim 1, characterized in that: The oil scraping assembly further includes a mounting bracket, which is provided in two groups, and the two groups of mounting brackets are respectively arranged at the two ends of the upper oil scraping plate and the lower oil scraping plate.

8. A continuous isostatic hot press for preparing CCM according to claim 7, characterized in that: The upper oil scraper plate and the lower oil scraper plate are both connected to the mounting brackets at both ends through connecting brackets.

9. A continuous isostatic hot press for preparing CCM according to claim 8, characterized in that: The upper oil scraper plate and the lower oil scraper plate are respectively provided with pin holes, and a guide pin is installed in the pin holes of the upper oil scraper plate and the pin holes of the lower oil scraper plate. The guide pin is provided with a threaded hole inside, and a screw is installed in the threaded hole. The upper oil scraper plate and the lower oil scraper plate are connected by the joint action of the guide pin and the screw.

10. The continuous isostatic hot press for preparing CCM according to claim 8, characterized in that: A first connecting hole is provided at the end of the upper scraper plate, and a first waist hole is provided at the position of the connecting bracket, and the aperture of the first waist hole is larger than the aperture of the first connecting hole. The upper scraper plate is connected to the connecting bracket by providing a first fixing member that passes through the first connecting hole and the first waist hole.

11. A continuous isostatic hot press for preparing CCM according to claim 8, characterized in that: A second connecting hole is provided at the end of the lower scraper plate, and a second waist hole is provided at the position of the connecting bracket, and the aperture of the second waist hole is also larger than the aperture of the second connecting hole. The upper scraper plate is connected to the connecting bracket by providing a second fixing part that passes through the second connecting hole and the second waist hole.

12. A continuous isostatic hot press for preparing CCM according to claim 1, characterized in that: The upper oil scraper plate includes an oil suction body, a rear sealing plate, a rubber oil scraper strip and a rubber strip pressure plate. The rear sealing plate is installed on one side of the oil suction body, the rubber oil scraper strip is installed on the other side of the oil suction body, and a rubber strip pressure plate is fixedly installed on the outside of the rubber oil scraper strip.

13. A continuous isostatic hot press for preparing CCM according to claim 12, characterized in that: An oil suction cavity is provided inside the oil suction body, and a vacuum oil suction hole is provided on the outer surface of the oil suction body, which is connected to the inside of the oil suction cavity. Vacuum oil suction pipes are also installed at both ends of the oil suction body, which are connected to the inside of the oil suction cavity.

14. A continuous isostatic hot press for preparing CCM according to claim 1, characterized in that: A coil unloading area is also provided on the same side of the upper pressing module and the lower pressing module, and transfer film coils, proton membrane coils and release film coils are placed in the coil unloading area.

15. The continuous isostatic hot press for preparing CCM according to claim 4, characterized in that: A group of laser non-destructive oil removal components is also provided on the same side of the upper pressing roller assembly and the lower pressing roller assembly.

16. A continuous isostatic hot press for preparing CCM according to claim 4, characterized in that: An upper smoke collecting device is further provided on one side of the upper pressing roller assembly, and a lower smoke collecting device is further provided on one side of the lower pressing roller assembly.

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