A multi-stage drying mechanism for etching foils

Abstract

This utility model discloses a multi-stage drying mechanism for etched foil, including a box body with slots on both the left and right surfaces and an air inlet on the rear surface. It also includes a drying assembly. The drying assembly comprises a drying chamber, an air inlet, an air outlet, a fan, heating wires, a waste heat recovery assembly, and a drying assembly. The drying chamber is fixedly connected to the left side of the box body. Slots are provided on both the left and right surfaces of the drying chamber. An air inlet is located on the rear surface of the drying chamber, and an air outlet is located on the front surface. Evenly distributed fans and mounting frames are fixedly connected inside the drying chamber. Evenly distributed heating wires are fixedly connected inside the mounting frames. A waste heat recovery assembly is located in the center of the box body. This multi-stage drying mechanism for etched foil performs multi-stage drying of the etched foil and recovers some waste heat, improving drying efficiency and energy utilization.

Description

Technical Field

[0001] This utility model relates to the field of corrosion foil drying technology, specifically a multi-stage drying mechanism for corrosion foil. Background Technology

[0002] Etched foil is a type of metal foil processed by specific chemical or electrochemical etching processes. It has a high specific surface area, porous structure, and excellent electrical properties. It is the core material for manufacturing aluminum electrolytic capacitors in the electronics industry. After the etching process, corrosive liquid remains on the surface of the etched foil, requiring a large amount of tap water to rinse it. After rinsing, the tap water used for cleaning will remain on the surface of the etched foil, requiring the use of drying equipment to dry the etched foil to remove the residual liquid on the surface of the etched foil.

[0003] In the prior art, patent CN217094593U discloses an integrated machine for cleaning and drying corrosion foil, including a housing. A cleaning box is fixedly installed inside the housing. The housing is equipped with a drying component one and a drying component two. A conveying roller is rotatably installed inside the cleaning box. Multiple rotating shafts are rotatably installed inside the cleaning box. The rotating shafts are located below the conveying rollers. A cleaning roller is fixedly installed on the rotating shaft. A brush is installed on the cleaning roller. A housing is installed on the rear side of the cleaning box. One end of the rotating shaft extends into the housing and is equipped with a transmission gear. Two limiting rods are installed on the inner walls of both sides of the housing. A movable plate is slidably installed inside the cleaning box. A transmission mechanism is provided between the movable plate and the transmission gear. Sliding plates are slidably sleeved on the two limiting rods. A fixing rod is fixedly installed on one side of the sliding plate. One end of the fixing rod is fixedly set on the movable plate. A driving mechanism is installed inside the housing and is adapted to the sliding plate. A reset mechanism is provided between the sliding plate and the limiting rod.

[0004] This type of integrated cleaning and multi-stage drying machine for etched foil has the following disadvantages: When drying the etched foil, the upper and lower surfaces of the etched foil are dried by drying component one and drying component two respectively. However, the surface of the etched foil that has just been cleaned has a lot of residual moisture. Direct drying will result in a long drying time and low drying efficiency. Therefore, we propose a multi-stage drying mechanism for etched foil. Utility Model Content

[0005] The technical problem this invention aims to solve is to overcome existing defects and provide a multi-stage drying mechanism for etched foil. Before drying, fan two blows air onto the etched foil to remove large liquid particles from its surface. Then, two automatically adhering absorbent sponges wipe the surface of the foil to further remove any remaining liquid, ensuring that only a small amount of un-wiped liquid remains on the foil surface when it enters the drying chamber. Fan one uses heat generated by the heating wire to dry the surface of the paper-etched foil. Simultaneously, conveyor pipes one and two recover some of the hot air, further drying the absorbent sponges and the foil. This multi-stage drying process, involving blowing out moisture, wiping away moisture, and drying the foil, along with the recovery of some waste heat, improves drying efficiency and energy utilization, effectively solving the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage drying mechanism for etched foil, comprising a box body, with slots on both the left and right surfaces of the box body, and an air inlet on the rear surface of the box body, and also including a drying component;

[0007] Drying assembly: This includes a drying chamber, two air inlets, an air outlet, a fan, heating wires, a waste heat recovery assembly, and a wiping assembly. The drying chamber is fixedly connected to the left side of the interior of the main body. Slots are provided on both the left and right surfaces of the drying chamber. An air inlet is provided on the rear surface of the drying chamber, and an air outlet is provided on the front surface. Evenly distributed fans and mounting brackets are fixedly connected inside the drying chamber. Evenly distributed heating wires are fixedly connected inside the mounting brackets. The waste heat recovery assembly is located in the center of the interior of the main body, and the wiping assembly is located on the right side of the interior. The waste heat recovery assembly is installed in conjunction with the air outlet, allowing the fan to blow air onto the etched foil before drying, thereby removing... Large particles of liquid are etched onto the surface of the foil. Two automatically attached absorbent sponges then wipe the surface, removing any remaining liquid. This ensures that only a small amount of un-dried liquid remains on the foil when it enters the drying chamber. A fan uses heat generated by an electric heating element to dry the foil surface. Simultaneously, conveyor pipes one and two recover some of the hot air, further drying the absorbent sponges and the foil. This multi-stage drying process—blowing out moisture, wiping away moisture, and drying the foil—combines multiple steps and recovers some waste heat, improving drying efficiency and energy utilization.

[0008] Furthermore, a control switch assembly is installed on the outside of the housing. The input end of the control switch assembly is electrically connected to an external power source, and the input ends of the fan and the heating wire are both electrically connected to the output end of the control switch assembly to control the operation of the electrical appliances.

[0009] Furthermore, the waste heat recovery assembly includes a first conveying pipe, a second conveying pipe, an air supply duct, and a diversion fan. The first conveying pipe is fixedly connected to the front surface of the box, and both ends of the first conveying pipe extend into the interior of the box. The left end of the first conveying pipe is fixedly connected to the front surface of the drying box and located in front of the air outlet. The rear surface of the first conveying pipe is fixedly connected to symmetrically distributed second conveying pipes via a three-way pipe. The rear ends of the second conveying pipes are fixedly connected to air supply ducts. The front surface of the drying box is fixedly connected to a diversion fan, which is located in the middle of the left end of the first conveying pipe. The input end of the diversion fan is electrically connected to the output end of the control switch group to recover and reuse part of the hot air.

[0010] Furthermore, a filter tank is connected in series inside the first conveying pipe, and a connector frame is inserted inside the filter tank. A waterproof and breathable membrane is fixedly connected in the mounting groove inside the connector frame to dehumidify and filter the recovered hot air.

[0011] Furthermore, the drying assembly includes a second fan, a mounting base, a second slider, a spring, a rotating rod, and a water-absorbing sponge tube. The second fan is fixedly connected to the front end of the first air inlet. The mounting base is fixedly connected to the rear surface of the inner side of the housing. The mounting base has a sliding groove inside, and the second slider is symmetrically distributed in the sliding groove. The side of the second slider away from the middle of the mounting base is fixedly connected to the inner wall of the sliding groove with a spring. The front surface of the second slider is rotatably connected to a rotating rod. The outer surface of the rotating rod is fixedly connected to the water-absorbing sponge tube by bolts. The input end of the second fan is electrically connected to the output end of the control switch group to wipe the corrosion foil.

[0012] Furthermore, the box body is rotatably connected to symmetrically distributed guide rollers, and the box body is rotatably connected to uniformly distributed guide rollers, which guide the movement of the etched foil.

[0013] Furthermore, a screw seat is fixedly connected to the inner rear surface of the box, a screw is rotatably connected to the inside of the screw seat, a knob is fixedly connected to the upper end of the screw, a slider is threadedly connected to the outer surface of the screw, the rear surface of the slider is slidably connected to the inner wall of the screw seat, and a pressure roller is fixedly connected to the front surface of the slider. The pressure roller is located directly above the rightmost guide roller, so that the corrosion foil remains taut when it moves inside the box.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This multi-stage drying mechanism for etched foil has the following advantages:

[0015] Before drying the etched foil, fan two blows air onto it to remove large liquid particles from its surface. Then, two automatically adhering absorbent sponges wipe the foil surface to further remove any remaining liquid. This ensures that only a small amount of un-dried liquid remains on the foil when it enters the drying chamber. Fan one uses heat generated by the heating wire to dry the foil surface. Simultaneously, conveyor pipes one and two recover some of the hot air, further drying the absorbent sponges and the foil. This multi-stage drying process—blowing out moisture, wiping away moisture, and drying the foil—involves multiple steps and recovers some waste heat, improving drying efficiency and energy utilization. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0019] Figure 4 This is an enlarged structural diagram of section B of the present invention;

[0020] Figure 5 This is a cross-sectional view of the drying oven of this utility model;

[0021] Figure 6 This is a front view cross-sectional structural diagram of the box body of this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the water-absorbing sponge cylinder and the air delivery channel of this utility model;

[0023] Figure 8 This is a schematic diagram of the filter tank and plug-in frame of this utility model.

[0024] In the diagram: 1. Box body, 2. Knob, 3. Guide roller one, 4. Guide roller two, 5. Screw, 6. Slider one, 7. Pressing roller, 8. Air inlet one, 9. Drying assembly, 91. Drying box, 92. Air inlet two, 93. Air outlet, 94. Fan one, 95. Heating wire, 96. Waste heat recovery assembly, 961. Conveying pipe one, 962. Conveying pipe two, 963. Air delivery duct, 964. Drainage fan, 97. Wiping assembly, 971. Fan two, 972. Mounting base, 973. Slider two, 974. Spring, 975. Rotating rod, 976. Water-absorbing sponge tube, 10. Control switch group, 11. Slot one, 12. Slot two, 13. Filter tank, 14. Plug-in frame. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-8 This embodiment provides a technical solution: a multi-stage drying mechanism for etched foil, including a box body 1. The left and right surfaces of the box body 1 are both provided with slots 11. The rear surface of the box body 1 is provided with an air inlet 8. The interior of the box body 1 is rotatably connected to symmetrically distributed guide rollers 4 and 3. The interior of the box body 1 is rotatably connected to uniformly distributed guide rollers 3. A screw seat is fixedly connected to the rear surface of the interior of the box body 1. A screw 5 is rotatably connected to the interior of the screw seat. A knob 2 is fixedly connected to the upper end of the screw 5. A slider 6 is threadedly connected to the outer surface of the screw 5. The rear surface of the slider 6 is slidably connected to the inner wall of the screw seat. A pressure roller 7 is fixedly connected to the front surface of the slider 6, located directly above the rightmost guide roller 3. The rear surface of the box body 1 is fixedly connected to a screw seat. The screw 5 is rotatably connected to the interior of the screw seat. A knob 2 is fixedly connected to the upper end of the screw 5. The surface is threaded with a slider 6, the rear surface of which is slidably connected to the inner wall of the screw seat. The front surface of the slider 6 is fixedly connected with a pressure roller 7, which is located directly above the rightmost guide roller 3. Rotating the knob 2 drives the screw 5 to rotate, causing the slider 6 to move (corrugated tubes can be fixedly connected between the upper and lower surfaces of the slider 6 and the inner wall of the screw seat, and the corrugated tubes are all sleeved on the outer surface of the screw 5 to prevent external dust and other impurities from sticking to the outer surface of the screw 5 and causing the screw 5 to jam), which drives the pressure roller 7 to move, so that the pressure roller 7 is in close contact with the upper surface of the etched foil, so that the etched foil is kept taut inside the chamber 1 during the drying process. The outside of the chamber 1 is equipped with a control switch group 10. The input end of the control switch group 10 is electrically connected to an external power supply. The input ends of the fan 94 and the heating wire 95 are electrically connected to the output end of the control switch group 10. The chamber 1 also includes a drying component 9.

[0027] Drying assembly 9 includes a drying chamber 91, an air inlet 92, an air outlet 93, a fan 94, heating wires 95, a waste heat recovery assembly 96, and a drying assembly 97. The drying chamber 91 is fixedly connected to the left side of the interior of the chamber 1. Slots 12 are provided on both the left and right surfaces of the drying chamber 91. An air inlet 92 is provided on the rear surface of the drying chamber 91, and an air outlet 93 is provided on the front surface of the drying chamber 91. Evenly distributed fans 94 and mounting brackets are fixedly connected inside the drying chamber 91. Evenly distributed heating wires 95 are fixedly connected inside the mounting brackets. When the etched foil moves into the drying chamber 91, the heating wires 95 generate heat. The fan 94 blows the heat generated by the heating wires 95 to the outer surface of the etched foil, thereby etching the outer surface of the foil. The surface is dried. A waste heat recovery assembly 96 is located in the center of the interior of the chamber 1. The waste heat recovery assembly 96 includes a first conveying pipe 961, a second conveying pipe 962, an air supply duct 963, and a ducting fan 964. The first conveying pipe 961 is fixedly connected to the front surface of the chamber 1, with both ends extending into the interior of the chamber 1. The left end of the first conveying pipe 961 is fixedly connected to the front surface of the drying chamber 91 and located in front of the air outlet 93. The rear surface of the first conveying pipe 961 is fixedly connected to symmetrically distributed second conveying pipes 962 via a three-way pipe. Each rear end of the second conveying pipe 962 is fixedly connected to an air supply duct 963 (the air supply duct 963 is a hollow trough with evenly distributed exhaust holes inside). The front of the drying chamber 91... A flow-guiding fan 964 is fixedly connected to the surface. The flow-guiding fan 964 is located in the middle of the left end of the conveying pipe 961. The input end of the flow-guiding fan 964 is electrically connected to the output end of the control switch group 10. A filter tank 13 is connected in series inside the conveying pipe 961. A connector frame 14 is inserted into the filter tank 13. Rubber pads can be provided on the edge of the connector frame 14 to ensure the sealing of the connection after insertion. A waterproof and breathable membrane (made of Gore-Tex fabric, which can absorb moisture in the gas passing through the membrane) is fixedly connected in the mounting groove inside the connector frame 14. The connector frame 14 can be periodically removed from the filter tank 13 to replace the waterproof and breathable membrane periodically. Some hot air passes through the air outlet under the guidance of the flow-guiding fan 964. Hot air is blown out of the outlet 93 into the first conveying pipe 961. The hot air is then conveyed through the first conveying pipe 961, the three-way pipe, and the second conveying pipe 962 to the air supply duct 963. A drying assembly 97 is located on the right side of the interior of the housing 1. A waste heat recovery assembly 96 is installed in conjunction with the outlet 93. The drying assembly 97 includes a second fan 971, a mounting base 972, a second slider 973, a spring 974, a rotating rod 975, and a water-absorbing sponge tube 976. The second fan 971 is fixedly connected to the front end of the air inlet 8. The mounting base 972 is fixedly connected to the rear surface of the interior of the housing 1. The mounting base 972 has a sliding groove inside, and symmetrically distributed second sliders 973 slide within the groove. Springs 974 are fixedly connected between the side of the second slider 973 furthest from the center of the mounting base 972 and the inner wall of the sliding groove.The front surface of slider 2 973 is rotatably connected to a rotating rod 975. The outer surface of the rotating rod 975 is bolted to an absorbent sponge 976 (making the absorbent sponge 976 detachable; after a certain period of use, the bolts can be loosened to replace the absorbent sponge 976). The input end of fan 2 971 is electrically connected to the output end of control switch group 10. When the external traction device is activated, the etching foil is pulled to the left, and fan 2 971 runs, blowing air onto the etching foil to remove large particles of liquid and impurities from its outer surface. The etching foil then passes between the two absorbent sponge cylinders 976. Spring 974 applies elastic force to slider 2 973, causing slider 2 973 to move towards the center of mounting base 972, driving the rotating rod 975 to move. This causes the absorbent sponge cylinders 976 to press tightly against the outer surface of the etching foil, thereby wiping the outer surface of the etching foil and absorbing the corrosive substances. The residual liquid on the surface of the etched foil is blown out through the exhaust vent on the front surface of the housing 1, and then blown through the exhaust holes of the air supply slot 963 to the outer surface of the water-absorbing sponge cylinder 976 and the outer surface of the etched foil, thereby drying the water-absorbing sponge cylinder 976 and ensuring its water absorption performance. Simultaneously, the etched foil is pre-dried before entering the drying chamber 91, realizing the recovery and utilization of excess heat, thus improving the drying efficiency of the etched foil. When using this multi-stage drying mechanism to dry the etched foil, one end of the etched foil is sequentially passed through the right-side slot one, the lower side of the right-side guide roller two 4, the upper side of the rightmost guide roller one 3, between the two water-absorbing sponge cylinders 976, the lower side of the middle guide roller one 3, the right-side slot two, the left-side slot two, the upper side of the leftmost guide roller one 3, the lower side of the left-side guide roller two 4, and the left-side slot one, and connected to the external traction equipment.

[0028] The working principle of the multi-stage drying mechanism for etched foil provided by this utility model is as follows: When using this multi-stage drying mechanism to dry the etched foil, one end of the etched foil is passed sequentially through the right-side slot one, the lower side of the right-side guide roller two 4, the upper side of the rightmost guide roller one 3, between the two water-absorbing sponge cylinders 976, the lower side of the middle guide roller one 3, the right-side slot two, the left-side slot two, the upper side of the leftmost guide roller one 3, the lower side of the left-side guide roller two 4, and the left-side slot one, and connected to the external traction equipment. At this time, rotating the knob 2 drives the screw 5 to rotate, causing the slider one 6 to move (corrugated pipes can be fixedly connected between the upper and lower surfaces of the slider one 6 and the inner wall of the screw seat, and the corrugated pipes are all sleeved on the screw 5). To prevent external dust and other impurities from sticking to the outer surface of the screw 5 and causing it to jam, the pressure roller 7 is moved to keep it tightly against the upper surface of the etching foil. This keeps the etching foil taut inside the chamber 1 during the drying process. At this time, the control switch group 10 is operated to start the fan 1 94, heating wire 95, and fan 2 971. The external traction device is activated to pull the etching foil to the left. Fan 2 971 runs and blows air onto the etching foil, blowing out large particles of liquid and impurities from the outer surface of the etching foil. After the etching foil passes between the two absorbent sponge cylinders 976, the spring 974 applies elastic force to the slider 2 973, causing the slider 2 973 to move towards the center of the mounting base 972. The rotating rod 975 moves, causing the absorbent sponge 976 to press tightly against the outer surface of the etched foil, thus wiping the outer surface of the etched foil and absorbing any remaining liquid. The blown-out moisture is discharged through the exhaust vent on the front surface of the chamber 1. The etched foil then moves into the drying chamber 91. The heating wire 95 generates heat, and the fan 94 blows the heat generated by the heating wire 95 onto the outer surface of the etched foil, thus drying the outer surface of the etched foil. (The two fans 94 are distributed vertically, and the two sets of heating wires 95 are also distributed vertically, with the heating wires 95 located between the two fans 94, and the etched foil passing between the two heating wires 95). At the same time, some of the hot air is blown out through the exhaust vent 93 to the conveyor under the guidance of the guiding fan 964. Inside pipe 961, hot air is conveyed through conveying pipe 961, a three-way pipe, and conveying pipe 962 to the air supply trough 963. (During the hot air recovery process, the waterproof and breathable membrane of the plug frame 14 in the filter tank 13 is dried through conveying pipe 961. The plug frame 14 can be periodically removed and the waterproof and breathable membrane replaced to ensure the drying performance of the waterproof and breathable membrane.) The dried hot air is blown through the exhaust hole of the air supply trough 963 to the outer surface of the water-absorbing sponge cylinder 976 and the outer surface of the corrosion foil, thereby drying the water-absorbing sponge cylinder 976 and ensuring its water absorption performance. At the same time, the corrosion foil is pre-dried before entering the drying box 91, realizing the recovery and utilization of excess heat, thereby improving the drying efficiency of the corrosion foil.

[0029] It is worth noting that in the above embodiments, the fan 94 is selected from DCB190, the duct fan 964 and the fan 971 are selected from TF4010, and the control switch group 10 is provided with control buttons that correspond one-to-one with the fan 94, the heating wire 95, the duct fan 864 and the fan 971 and are used to control their switching.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-stage drying mechanism for etched foil, comprising a housing (1), wherein slots (11) are provided on both the left and right surfaces of the housing (1), and an air inlet (8) is provided on the rear surface of the housing (1), characterized in that: It also includes a drying component (9); Drying assembly (9): It includes a drying box (91), an air inlet 2 (92), an air outlet (93), a fan 1 (94), an electric heating wire (95), a waste heat recovery assembly (96), and a wiping assembly (97). The drying box (91) is fixedly connected to the left side of the box body (1). The left and right surfaces of the drying box (91) are provided with slots 2 (12). The rear surface of the drying box (91) is provided with an air inlet 2 (92). The front surface of the drying box (91) is provided with an air outlet (93). The interior of the drying box (91) is fixedly connected with a uniformly distributed fan 1 (94) and a mounting bracket. The interior of the mounting bracket is fixedly connected with a uniformly distributed electric heating wire (95). The middle part of the interior of the box body (1) is provided with a waste heat recovery assembly (96). The right side of the interior of the box body (1) is provided with a wiping assembly (97). The waste heat recovery assembly (96) is installed in conjunction with the air outlet (93). The waste heat recovery assembly (96) includes a first conveying pipe (961), a second conveying pipe (962), an air supply trough (963), and a diversion fan (964). The first conveying pipe (961) is fixedly connected to the front surface of the box (1). Both ends of the first conveying pipe (961) penetrate into the interior of the box (1). The left end of the first conveying pipe (961) is fixedly connected to the front surface of the drying box (91) and located in front of the air outlet (93). The rear surface of the first conveying pipe (961) is fixedly connected to the symmetrically distributed second conveying pipe (962) through a three-way pipe. The rear ends of the second conveying pipe (962) are all fixedly connected to the air supply trough (963). The front surface of the drying box (91) is fixedly connected to the diversion fan (964). The diversion fan (964) is located in the middle of the left end of the first conveying pipe (961). The input end of the diversion fan (964) is electrically connected to the output end of the control switch group (10). The drying assembly (97) includes a second fan (971), a mounting base (972), a second slider (973), a spring (974), a rotating rod (975), and a water-absorbing sponge tube (976). The second fan (971) is fixedly connected to the front end of the first air inlet (8). The mounting base (972) is fixedly connected to the rear surface of the inner side of the housing (1). The mounting base (972) has a sliding groove inside. The second slider (973) is symmetrically distributed in the sliding groove. The side of the second slider (973) away from the middle of the mounting base (972) is fixedly connected to the inner wall of the sliding groove with a spring (974). The front surface of the second slider (973) is rotatably connected to a rotating rod (975). The outer surface of the rotating rod (975) is fixedly connected to the water-absorbing sponge tube (976) by bolts. The input end of the second fan (971) is electrically connected to the output end of the control switch group (10).

2. The multi-stage drying mechanism for etched foil according to claim 1, characterized in that: The outer side of the housing (1) is provided with a control switch group (10). The input end of the control switch group (10) is electrically connected to an external power source, and the input ends of the fan (94) and the heating wire (95) are both electrically connected to the output end of the control switch group (10).

3. The multi-stage drying mechanism for etched foil according to claim 1, characterized in that: The conveying pipe (961) has a filter tank (13) connected in series inside, and a plug frame (14) is inserted inside the filter tank (13). A waterproof and breathable membrane is fixedly connected in the mounting groove inside the plug frame (14).

4. The multi-stage drying mechanism for etched foil according to claim 1, characterized in that: The box (1) is rotatably connected to two guide rollers (4) that are symmetrically distributed on the left and right sides, and the box (1) is rotatably connected to one guide roller (3) that is evenly distributed.

5. The multi-stage drying mechanism for etched foil according to claim 4, characterized in that: The inner rear surface of the housing (1) is fixedly connected to a screw seat, and the screw seat is rotatably connected to a screw (5). The upper end of the screw (5) is fixedly connected to a knob (2). The outer surface of the screw (5) is threadedly connected to a slider (6). The rear surface of the slider (6) is slidably connected to the inner wall of the screw seat. The front surface of the slider (6) is fixedly connected to a pressure roller (7). The pressure roller (7) is located directly above the rightmost guide roller (3).

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