An extrusion stretcher for processing bio-based degradable materials

Abstract

The application relates to the field of plastic waste recycling, and specifically discloses an extrusion drawbench for processing bio-based degradable materials. The extrusion drawbench comprises a support frame, an extrusion module is installed on the support frame, a cooling pool is installed on the support frame, a driving motor is installed on the support frame, a plurality of pairs of chain wheels are rotationally connected in the cooling pool, a plurality of pairs of chain wheels are jointly provided with a chain, a plurality of conveying plates are fixedly connected to the chain which is symmetrically distributed, a plurality of pairs of supporting plates are arranged on the conveying plates, and each pair of the supporting plates is used for limiting materials. The high-temperature soft materials just extruded are limited by the paired supporting plates, the materials are prevented from being deformed due to the self gravity, the cooling liquid sprayed from the water outlet forms a continuous water film on the surface of the supporting plate, the materials are suspended on the water film to be cooled, the hard contact between the materials and the conveying parts is reduced to generate pressure marks, and the stability of the cross-section shape of the materials is ensured.

Description

Technical Field

[0001] This invention relates to the field of plastic waste recycling, and more particularly to an extrusion strip machine for processing bio-based degradable materials. Background Technology

[0002] With the full implementation of global plastic restriction policies, the market demand for bio-based degradable materials, as a core alternative to traditional plastics, is experiencing explosive growth. Extrusion is a core process in the production of bio-based degradable materials. The dimensions of the extrusion strip cross-section directly affect the uniformity of the particle size of the subsequent produced particles, which in turn determines the product quality and production efficiency of downstream processing stages such as injection molding, blown film, and spinning. It is a key indicator for measuring the quality of bio-based materials.

[0003] Currently, bio-based biodegradable material strips are generally cooled by water. Although this method has high cooling efficiency, it has an inherent defect that cannot be overcome: when bio-based biodegradable materials are first extruded, they are in a high-temperature soft state, and their hardness is much lower than that of ordinary plastics that have just been extruded. When transported in existing water-cooled tanks, because the density of the material is greater than that of water, the material will cause indentations and deformation on the surface of the strip due to its own gravity and contact with the surface of the conveyor chain. The circular cross-section becomes elliptical, which causes deviation in the particle size of subsequent pelleting and affects the subsequent pelleting process. Summary of the Invention

[0004] The purpose of this invention is to provide an extrusion strip machine for processing bio-based degradable materials, thereby overcoming the disadvantages mentioned in the background above.

[0005] The technical implementation of the present invention is as follows: an extrusion strip machine for processing bio-based degradable materials includes a support frame, an extrusion module installed on one side of the support frame, a cooling pool installed on the support frame, a drive motor installed on the support frame, several pairs of sprockets rotatably connected in the cooling pool, each pair of sprockets being connected by a rotating rod, the several pairs of sprockets sharing a symmetrically distributed chain, the output shaft of the drive motor being used to drive the chain to rotate through the sprockets, the symmetrically distributed chain being fixedly connected to several conveyor plates, the conveyor plates being provided with several pairs of support plates, each pair of support plates being used to limit the material.

[0006] As an improvement to the above scheme, the distance between the same pair of support plates gradually increases from the side closer to the conveyor plate to the side farther away from the conveyor plate.

[0007] As an improvement to the above solution, the support frame is equipped with symmetrically distributed fixing plates on one side near the extrusion module. A water pump is installed on the fixing plate on one side. The symmetrically distributed fixing plates are jointly fixed to a water outlet chamber. The water outlet chamber is provided with a plurality of first through holes. The water outlet chamber is fixed to a plurality of guide plates. The guide plates are provided with a plurality of second through holes. The first through holes and the second through holes correspond one-to-one, and the first through holes communicate with the corresponding second through holes.

[0008] As an improvement to the above solution, the guide plate is fixedly connected to a baffle plate, which is used to guide the liquid flowing out of the water outlet chamber.

[0009] As an improvement to the above solution, the water flow path formed by the baffle plate and the adjacent guide plate corresponds to the adjacent pair of support plates.

[0010] As an improvement to the above solution, it also includes symmetrically distributed electric slide rails, which are fixedly connected to the cooling pool. Each symmetrically distributed electric slide rail is slidably connected to a symmetrically distributed electric slider. The electric sliders on the same side of different electric slide rails are jointly fixedly connected to a support plate. The support plate is fixedly connected to a guide rail. The guide rail is slidably connected to several sliding members. The number of sliding members on the same guide rail is the same as the number of conveyor plates. Each sliding member is fixedly connected to several pressing members. The pressing members of two corresponding sliding members on different guide rails are staggered. The pressing members penetrate the conveyor plate and are slidably connected to the conveyor plate. The pressing members are used to press the support plate. The support plate is rotatably connected to the corresponding conveyor plate. The same pair of support plates are hinged to each other.

[0011] As an improvement to the above solution, each pair of support plates is fixedly connected to a support member, which is used to restrict the material.

[0012] As an improvement to the above solution, it also includes symmetrically distributed electric push rods, which are hinged to the support frame and located between the extrusion module and the water outlet chamber. The telescopic ends of the symmetrically distributed electric push rods are jointly fixed to guide posts. The cooling pool is fixed to symmetrically distributed guide frames. The guide posts and the symmetrically distributed guide frames are slidably connected. The guide frames are rotatably connected to swing plates, and elastic elements are fixed between the guide frames and adjacent swing plates.

[0013] As an improvement to the above solution, the guide post has a plurality of annular grooves evenly distributed, and the number of annular grooves on the guide post is the same as the number of logarithms of the support plates on the same conveying plate.

[0014] As an improvement to the above solution, the guide frame is composed of a first horizontal part, a second horizontal part, a first inclined part, and a second inclined part, and the first inclined part and the second inclined part are both located between the first horizontal part and the second horizontal part.

[0015] The invention achieves the following effects: By using paired support plates to limit the movement of freshly extruded high-temperature soft materials, and with an opening structure that is wider at the top and narrower at the bottom, the invention reduces the possibility of the material collapsing and spreading out due to its own weight. At the same time, the cooling liquid sprayed from the water outlet forms a continuous water film on the surface of the support plates, allowing the material to suspend on the water film for cooling. This reduces the hard contact between the material and the conveying components, thus reducing indentations and ensuring the stability of the material's cross-sectional shape.

[0016] By moving the extruder, the opening spacing between each pair of support plates can be adjusted simultaneously. Combined with the adaptive deformation of the support, each pair of support plates can be adaptively adjusted according to the required cross-sectional diameter of different materials to meet different processing needs.

[0017] The guide column guides the freshly extruded molten material head, and in conjunction with the guide frame, the guide column can guide the material strip between each pair of support plates, realizing the docking from extrusion to conveying, while reducing the adhesion between adjacent materials. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the fixing plate and the water outlet chamber of the present invention; Figure 3 This is a three-dimensional structural diagram of the chain and electric actuator of the present invention; Figure 4 This is a three-dimensional structural diagram of the conveying plate, support plate, and sliding component of the present invention; Figure 5 This is an exploded three-dimensional structural diagram of the extrusion component and support component of the present invention; Figure 6 This is a three-dimensional structural diagram of the blocking plate and support member of the present invention; Figure 7 This is a three-dimensional structural diagram of the electric slide rail and support plate of the present invention; Figure 8 This is a three-dimensional structural diagram of the guide post and guide frame of the present invention; Figure 9 This is a three-dimensional structural diagram of the guide frame and swing plate of the present invention; Figure 10 For the present invention Figure 3 An enlarged 3D structural diagram at point A in the middle; Figure 11 For the present invention Figure 9Enlarged 3D structural diagram at point B.

[0019] The components in the attached diagram are labeled as follows: 1-Support frame, 2-Extrusion module, 3-Cooling tank, 4-Drive motor, 41-Sprocket, 5-Chain, 6-Conveyor plate, 7-Support plate, 201-Fixing plate, 202-Water pump, 203-Water outlet chamber, 203-First through hole, 204-Guide plate, 204-Second through hole, 301-Blocking plate, 401-Electric slide rail, 402-Support plate, 403-Guide rail, 404-Sliding component, 405-Extrusion component, 501-Support component, 601-Electric push rod, 602-Guide column, 603-Guide frame, 604-Swing plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 An extrusion strip machine for processing bio-based degradable materials, such as Figures 1-6 As shown, the device includes a support frame 1, an extrusion module 2 mounted on one side of the support frame 1, a cooling pool 3 mounted on the support frame 1, a drive motor 4 mounted on the support frame 1, and several pairs of sprockets 41 rotatably connected inside the cooling pool 3. Each pair of sprockets 41 is connected to the other by a rotating rod. Several pairs of sprockets 41 are wound around a symmetrically distributed chain 5. The output shaft of the drive motor 4 is used to drive the chain 5 to rotate through the sprockets 41. Several conveying plates 6 are fixedly connected to the symmetrically distributed chain 5. Several pairs of support plates 7 are provided on the conveying plates 6. Each pair of support plates 7 is used to limit the material. The distance between the same pair of support plates 7 gradually increases from the side closer to the conveying plate 6 to the side farther away from the conveying plate 6.

[0022] In the above scheme, the extrusion module 2 is located on the rear side of the support frame 1. The extrusion module 2 is an existing extrusion device with a feed port and a discharge port. The feed port is used to put in the material to be melted, and the discharge port is used to extrude the molten material. The upper part of the chain 5 has a horizontal section and an inclined section. Cooling liquid is placed in the cooling pool 3, and the height of the cooling liquid is higher than the height of the support plate 7 of the conveyor plate 6 located on the horizontal section of the chain 5. The output end of the drive motor 4 is connected to the sprocket 41 at the lower front side. There are four pairs of sprockets 41. The number of support plates 7 in each pair is the same as the number of discharge ports of the extrusion module 2. In this embodiment, the conveyor plate 6 and the support plate 7 are fixedly connected.

[0023] like Figures 1-3 , Figure 6 and Figure 10 As shown, a symmetrically distributed fixing plate 201 is installed on the side of the support frame 1 near the extrusion module 2. A water pump 202 is installed on the fixing plate 201 on one side. The symmetrically distributed fixing plates 201 are jointly fixed to a water outlet chamber 203. The water outlet chamber 203 is provided with a number of first through holes 2033. A number of guide plates 204 are fixed to the water outlet chamber 203. The guide plates 204 are provided with a number of second through holes 2044. The first through holes 2033 and the second through holes 2044 correspond one-to-one and are connected. A baffle plate 301 is fixed to the guide plate 204. The baffle plate 301 is used to guide the liquid flowing out of the water outlet chamber 203. The water flow path formed by the baffle plate 301 and the adjacent guide plate 204 corresponds to the adjacent pair of support plates 7.

[0024] In the above scheme, a water pump 202 is installed on the right fixed plate 201. The water pump 202 is equipped with a water pumping pipe and an injection pipe. The water pumping pipe is used to extract coolant from the cooling pool 3. A closed-loop temperature control and automatic liquid replenishment filtration system (not shown in the figure) is also installed outside the cooling pool 3 to cooperate with the cooling pool 3. The injection pipe is connected to the water outlet chamber 203. The number of guide plates 204 is the same as the number of support plates 7 on the same conveying plate 6. The water outlet chamber 203 is located above the horizontal section support plate 7. The coolant sprayed from the water outlet chamber 203 forms a continuous water film on the surface of the support plate 7, so that the material is suspended on the water film for cooling, reducing the hard contact between the material and the conveying components that causes indentation, and ensuring the stability of the material cross-sectional shape.

[0025] Working principle: When using this device to convey materials, the drive motor 4 is started first. The drive motor 4 drives the two chains 5 to rotate through the corresponding sprocket 41. The chains 5 drive the parts on them to move together. Then, the extrusion module 2 extrudes the processed molten material through the discharge port of the extrusion module 2. As the material is extruded from the discharge port of the extrusion module 2, the material comes into contact with all the support plates 7 on the lower conveyor plate 6. Each pair of support plates 7 guides the corresponding material. At the same time, the two chains 5 drive the corresponding support plates 7 to move forward through the conveyor plate 6. During this process, the material comes into contact with all the support plates 7 on the left side of the lower conveyor plate 6 in sequence.

[0026] During the forward conveying of materials by the conveyor plate 6, after a portion of the material passes under the water outlet chamber 203 (this setting is to ensure the conveying force of the support plate 7 on the material), the water pump 202 is started. The pump pipe of the water pump 202 injects the coolant in the cooling pool 3 into the water outlet chamber 203 through the injection pipe. The coolant in the water outlet chamber 203 reaches the space between the guide plate 204 and the baffle plate 301 through the first through hole 2033 and the second through hole 2044. The coolant sprays out from between the guide plate 204 and the baffle plate 301, and then contacts the upper surface of the corresponding support plate 7. Subsequently, it flows through the upper surface of the support plate 7 into the space between each pair of support plates 7. The coolant lifts the material on each pair of support plates 7 upwards, and the material loses contact with the support plate 7. The coolant forms a continuous water film on the surface of the support plate 7, so that the material is suspended on the water film for cooling, reducing the indentation caused by the hard contact between the material and the conveying components, and ensuring the stability of the material cross-sectional shape.

[0027] After the material passes under the outlet chamber 203, it comes into contact with the support plate 7 under its own gravity. As the support plate 7 continues to convey the material, it enters the next process for drying and pelletizing. After the extrusion module 2 extrudes all the material in the batch, the water pump 202 is turned off after the last material passes through the outlet chamber 203. Then the material loses contact with the support plate 7 and the drive motor 4 is turned off. When the material needs to be processed again, the above steps can be repeated.

[0028] Example 2 Based on Example 1, such as Figure 2 , Figures 4-7 and Figure 10 As shown, it also includes symmetrically distributed electric slide rails 401, which are fixedly connected to the cooling pool 3. Each symmetrically distributed electric slide rail 401 is slidably connected to a symmetrically distributed electric slider. The electric sliders on the same side of different electric slide rails 401 are jointly fixedly connected to a support plate 402. The support plate 402 is fixedly connected to a guide rail 403. The guide rail 403 is slidably connected to several sliding parts 404. The number of sliding parts 404 on the same guide rail 403 is the same as the number of conveyor plates 6. Several extrusion parts 405 are fixedly connected to the sliding parts 404. The extrusion parts 405 of two corresponding sliding parts 404 on different guide rails 403 are staggered. The extrusion parts 405 penetrate the conveyor plate 6 and are slidably connected to the conveyor plate 6. The extrusion parts 405 are used to extrude the support plate 7. The support plate 7 is rotatably connected to the corresponding conveyor plate 6. The same pair of support plates 7 are hinged to each other. Each pair of support plates 7 is fixedly connected to a support member 501, which is used to restrict the material.

[0029] In the above scheme, there are two electric slide rails 401 symmetrically distributed front and back. Two extrusion parts 405 are installed on the right slide part 404, and three extrusion parts 405 are installed on the left slide part 404. Each extrusion part 405 consists of a sliding rod and several extrusion blocks. The number of extrusion blocks on the same extrusion part 405 is the same as the number of pairs of support plates 7 on the same conveyor plate 6. The support part 501 consists of two elastic plates, and the two elastic plates of the support part 501 slide relative to each other. By adjusting the size of the opening between each pair of support plates 7, and cooperating with the adaptive deformation of the support part 501, each pair of support plates 7 can be adaptively adjusted according to the required cross-sectional diameter of different materials to meet different processing requirements.

[0030] Working principle: After the material is extruded from the discharge port by the extrusion module 2, the material comes into contact with the support member 501 on the support plate 7. When the coolant is sprayed out from between the guide plate 204 and the baffle plate 301, the coolant rushes in through the upper surface of the support member 501, and the material loses contact with the support member 501. The coolant forms a continuous water film on the surface of the support member 501 on the support plate 7.

[0031] When materials of different diameters need to be processed (this embodiment takes a reduction in material diameter as an example), before the drive motor 4 starts, two electric slide rails 401 are activated. The two electric slide rails 401, through four electric sliders, drive two support plates 402 to move in opposite directions. The support plates 402 drive adjacent guide rails 403 to move together, and the guide rails 403 drive corresponding sliding parts 404 to move together. Figure 6 Taking the direction shown as an example, during this process, the right-side sliding member 404 drives the two extrusion members 405 to move to the right, and the left-side sliding member 404 drives the three extrusion members 405 to move to the left. The extrusion blocks of the extrusion members 405 on the right-side sliding member 404 move in opposite directions to the extrusion blocks of the extrusion members 405 on the adjacent left-side sliding member 404. The extrusion blocks of the extrusion members 405 on the right-side sliding member 404 and the extrusion blocks of the extrusion members 405 on the adjacent left-side sliding member 404 jointly extrude the corresponding support plate 7. Each pair of support plates 7 swings upward, and each pair of support plates 7 extrudes the corresponding support member 501. During this process, the two arc-shaped plates of the support member 501 deform. Taking one of the support members 501 as an example, the arc-shaped plate on the left side of the support member 501 slides relative to the arc-shaped plate on its right side, so that the upper surface of the support member 501 is still arc-shaped. After the adjustment is completed according to the material requirements, the two electric slide rails 401 are closed to ensure that the cross-sectional diameter required by different materials can be adaptively adjusted to meet different processing requirements.

[0032] Example 3 Based on Example 2, such as Figure 2 , Figure 3 and Figures 8-11As shown, it also includes symmetrically distributed electric push rods 601, which are hinged to the support frame 1. The electric push rods 601 are located between the extrusion module 2 and the water outlet chamber 203. The telescopic ends of the symmetrically distributed electric push rods 601 are all fixedly connected to guide posts 602. The cooling pool 3 is fixedly connected to symmetrically distributed guide frames 603. The guide posts 602 and the symmetrically distributed guide frames 603 are slidably connected. The guide frames 603 are rotatably connected to swing plates 604, and elastic elements are fixedly connected between the guide frames 603 and adjacent swing plates 604. The guide posts 602 have several annular grooves that are evenly distributed. The number of annular grooves of the guide posts 602 is the same as the number of pairs of support plates 7 on the same conveying plate 6. The guide frames 603 are composed of a first horizontal part, a second horizontal part, a first inclined part, and a second inclined part, and the first inclined part and the second inclined part are both located between the first horizontal part and the second horizontal part.

[0033] In the above scheme, such as Figure 9 As shown, the first horizontal part of the guide frame 603 is located at the upper part of the guide frame 603, and the second horizontal part of the guide frame 603 is located at the lower part of the guide frame 603. The first inclined part and the second inclined part of the guide frame 603 are located on the right and left sides of the first horizontal part and the second horizontal part of the guide frame 603, respectively. The elastic element provided between the guide frame 603 and the adjacent swing plate 604 is a torsion spring. The guide post 602 guides the freshly extruded molten material head. At the same time, in conjunction with the guidance of the guide frame 603, the guide post 602 can guide the material strip between each pair of support plates 7, reducing the occurrence of adhesion between adjacent materials.

[0034] Working Principle: After the material is extruded from the outlet by the extrusion module 2, the molten material head passes through the guide column 602. At this time, the two electric push rods 601 are activated. The telescopic ends of the two electric push rods 601 jointly drive the guide column 602 forward. The guide column 602 slides within the first horizontal part of the two guide frames 603. During this process, the guide column 602 contacts the material head and guides it, reducing the swaying and adhesion between the material heads. Subsequently, the guide column 602 enters the first inclined part of the guide frame 603 and places the material head on the corresponding support member 501. At this time, the guide column 602 is located between the first inclined part and the second horizontal part of the guide frame 603. Then, the telescopic ends of the two electric push rods 601 begin to reset. The guide column 602 moves backward and enters the second horizontal section of the guide frame 603. During this process, the material contacts the support member 501 and gradually loses contact with the guide column 602. The support member 501 conveys the material. Then, the guide column 602 enters the second inclined section of the guide frame 603 and contacts the swing plate 604. As the guide column 602 continues to move, the swing plate 604 swings upward. The elastic element set between the guide frame 603 and the adjacent swing plate 604 twists and stores force. Then, the guide column 602 enters the first horizontal section of the guide frame 603 and loses contact with the swing plate 604. The elastic force of the elastic element is released, and the swing plate 604 resets. Afterward, the telescopic ends of the two electric push rods 601 drive the guide column 602 to reset and close the two electric push rods 601.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An extrusion strip machine for processing bio-based degradable materials, comprising a support frame (1), an extrusion module (2) mounted on one side of the support frame (1), a cooling pool (3) mounted on the support frame (1), a drive motor (4) mounted on the support frame (1), a plurality of pairs of sprockets (41) rotatably connected in the cooling pool (3), each pair of sprockets (41) being connected by a rotating rod, the plurality of pairs of sprockets (41) being wound together with symmetrically distributed chains (5), the output shaft of the drive motor (4) being used to drive the chains (5) to rotate through the sprockets (41), characterized in that, The symmetrically distributed chains (5) are fixed together with several conveyor plates (6), and several pairs of support plates (7) are provided on the conveyor plates (6). Each pair of support plates (7) is used to limit the material. The distance between the same pair of support plates (7) gradually increases from the side closer to the conveyor plate (6) to the side farther away from the conveyor plate (6); The support frame (1) has symmetrically distributed fixing plates (201) installed on one side near the extrusion module (2). A water pump (202) is installed on one side of the fixing plate (201). The symmetrically distributed fixing plates (201) are fixed together to a water outlet chamber (203). The water outlet chamber (203) is provided with a plurality of first through holes (2033). The water outlet chamber (203) is fixed to a plurality of guide plates (204). The guide plates (204) are provided with a plurality of second through holes (2044). The first through holes (2033) and the second through holes (2044) correspond one-to-one, and the first through holes (2033) are connected to the corresponding second through holes (2044). The guide plate (204) is fixedly connected to a baffle plate (301), which is used to guide the liquid flowing out of the water outlet (203); It also includes symmetrically distributed electric slide rails (401), which are fixedly connected to the cooling pool (3). Each of the symmetrically distributed electric slide rails (401) is slidably connected to a symmetrically distributed electric slider. The electric sliders on the same side of different electric slide rails (401) are jointly fixedly connected to a support plate (402). The support plate (402) is fixedly connected to a guide rail (403). The guide rail (403) is slidably connected to a number of sliding parts (404). The number of sliding parts (404) on the same guide rail (403) is the same as that on the conveying plate. (6) The number of sliding members (404) is the same. Several extrusion members (405) are fixedly connected to the sliding member (404). The extrusion members (405) of two corresponding sliding members (404) on different guide rails (403) are staggered. The extrusion members (405) penetrate the conveying plate (6) and are slidably connected to the conveying plate (6). The extrusion members (405) are used to extrude the support plate (7). The support plate (7) is rotatably connected to the corresponding conveying plate (6). The same pair of support plates (7) are hinged to each other.

2. An extrusion strip machine for processing bio-based degradable materials according to claim 1, characterized in that, The water flow path formed by the baffle plate (301) and the adjacent guide plate (204) corresponds to the adjacent pair of support plates (7).

3. An extrusion strip machine for processing bio-based degradable materials according to claim 2, characterized in that, Each pair of support plates (7) is fixedly connected to a support member (501) for restraining the material.

4. An extrusion strip machine for processing bio-based degradable materials according to claim 3, characterized in that, It also includes symmetrically distributed electric push rods (601), which are hinged to the support frame (1). The electric push rods (601) are located between the extrusion module (2) and the water outlet chamber (203). The telescopic ends of the symmetrically distributed electric push rods (601) are fixedly connected to guide posts (602). The cooling pool (3) is fixedly connected to symmetrically distributed guide frames (603). The guide posts (602) and the symmetrically distributed guide frames (603) are slidably connected. The guide frames (603) are rotatably connected to swing plates (604), and the guide frames (603) and the adjacent swing plates (604) are fixedly connected to elastic elements.

5. An extrusion strip machine for processing bio-based degradable materials according to claim 4, characterized in that, The guide post (602) has a plurality of annular grooves evenly distributed, and the number of annular grooves of the guide post (602) is the same as the number of logarithms of the support plate (7) on the same conveying plate (6).

6. An extrusion sheeter for processing bio-based degradable materials according to claim 5, characterized in that, The guide frame (603) consists of a first horizontal part, a second horizontal part, a first inclined part and a second inclined part, and the first inclined part and the second inclined part are both located between the first horizontal part and the second horizontal part.

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