Forming device for waterproof roll

By introducing water-cooling and air-cooling systems into the waterproof membrane forming device, the lower roller is circulated and cooled, solving the problem of low cooling efficiency, achieving efficient cooling of the waterproof membrane, and improving production quality.

CN223933986UActive Publication Date: 2026-02-24BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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Patent Information

Application Number
CN202520147802.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-22
Publication Date
2026-02-24
Estimated Expiration
2035-01-22

AI Technical Summary

Technical Problem

In existing waterproof membrane forming devices, the coolant in the lower roller can only rely on natural cooling during the flow of the coolant through the lower roller, which reduces the cooling efficiency and makes it impossible to continuously deliver coolant at a constant temperature, thus affecting the cooling effect of the waterproof membrane.

Method used

A forming device for waterproof roll material was designed. By setting up a water-cooling section and an air-cooling section, the lower roller is circulated and cooled. The water-cooling section delivers coolant at a constant temperature into the lower roller, and the air-cooling section cools the upper roller, thereby improving the cooling efficiency.

Benefits of technology

This technology enables efficient cooling of the waterproof membrane, ensuring that the lower roller can continuously deliver coolant at a constant temperature, thereby improving cooling efficiency and enhancing the production quality of the waterproof membrane.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a forming device for a waterproof coiled material. The forming device comprises a base, the lower rollers are sequentially and rotatably mounted on the base in the transverse direction, each lower roller extends in the longitudinal direction, and the two ends of each lower roller extend out of the base; the plurality of upper rollers are arranged opposite to the plurality of lower rollers respectively; the adjusting part is mounted on the base and is configured to adjust the distance between the upper roller and the lower roller by driving the upper roller to move up and down so as to roll waterproof coiled materials with different thicknesses; and the water cooling part is mounted on the base, is connected with the two ends, extending out of the base, of each lower roller, and is constructed to circularly convey cooling liquid with constant temperature into each lower roller so as to cool the lower rollers, so that the waterproof coiled material is cooled.
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Description

Technical Field

[0001] At least one embodiment of this utility model relates to the field of roll forming apparatus technology, and particularly to a forming apparatus for waterproof rolls. Background Technology

[0002] Polymer waterproof membrane is a material used in building waterproofing projects. It is mainly made of polymers and has good waterproof performance and durability. The cooling and molding of polymer waterproof membrane is a key production step, involving the stability of the material's physical properties and product quality control.

[0003] In order to cool and shape polymer waterproof membranes, a forming device for waterproof membranes has been proposed in the prior art. This forming device improves the cooling efficiency of the lower roller on the waterproof membrane by introducing coolant into the lower roller.

[0004] However, in existing forming devices for waterproof membranes, the coolant in the lower roller can only cool down naturally by indirectly contacting the external environment as it flows through the lower roller. After long-term operation, the temperature of the coolant continues to rise, making it impossible to continuously supply coolant at a constant temperature to the lower roller, which reduces the cooling efficiency of the lower roller for the waterproof membrane. Utility Model Content

[0005] In view of this, the present invention provides a forming device for waterproof membrane, which realizes the circulating cooling of the lower roller to improve the cooling efficiency of the lower roller on the waterproof membrane.

[0006] According to an embodiment of the present invention, a forming apparatus for waterproof membrane is provided, comprising: a base; a plurality of lower rollers rotatably mounted sequentially on the base in a transverse direction, each lower roller extending in a longitudinal direction and having both ends protruding from the base; a plurality of upper rollers respectively facing the plurality of lower rollers; an adjusting unit mounted on the base and configured to adjust the distance between the upper rollers and the lower rollers by driving the upper rollers to move up and down, so as to roll waterproof membranes of different thicknesses; and a water cooling unit mounted on the base and connected to both ends of each lower roller protruding from the base, configured to circulate and deliver a coolant of constant temperature into each lower roller to cool the plurality of lower rollers, thereby cooling the waterproof membrane.

[0007] According to an embodiment of the present invention, the water-cooling section includes: two collecting channels, respectively installed on both sides of the base extending in the longitudinal direction and connected to both ends of each of the lower rollers; a water tank, connected to one of the two collecting channels; a water pump, connected to the water tank; and a heat dissipation assembly, respectively connected to the water pump and the other of the two collecting channels, so that the coolant circulates through the lower rollers.

[0008] According to an embodiment of the present invention, the heat dissipation assembly includes: a fan; and a radiator installed on one side of the fan's air outlet, wherein the radiator is connected to the water pump and another of the collection channels.

[0009] According to an embodiment of the present invention, the adjustment part includes: a support frame mounted on the base; a drive assembly mounted on the support frame; a lifting platform mounted on the drive assembly; and a first support beam and a second support beam connected to the lifting platform. The two ends of the plurality of upper rollers are respectively rotatably mounted on the first support beam and the second support beam. Under the drive of the drive assembly, the plurality of upper rollers reciprocate linearly in the height direction.

[0010] According to an embodiment of the present invention, the first support beam and the second support beam are constructed to be hollow and communicate with the interior of each of the upper rollers; the air-cooling unit is installed on the lifting platform and communicates with the first support beam, and is configured to cool the plurality of upper rollers by conveying a cooling medium into the interior of the first support beam, the cooling medium being discharged through the second support beam.

[0011] According to an embodiment of the present invention, the air-cooling section includes a blower connected to the first support beam to deliver a cooling airflow as a cooling medium into the interior of the first support beam.

[0012] According to an embodiment of the present invention, each of the upper roller inner walls is provided with a plurality of metal plates arranged in the circumferential direction and extending in the radial direction to increase the contact area between the cooling airflow and the inner wall of the upper roller.

[0013] According to an embodiment of the present invention, the drive assembly includes: a housing mounted on the support frame; a turbine mounted inside the housing; a worm gear meshing with the turbine, one end of the worm gear extending out of the housing; and a lead screw, one end of the lead screw being threadedly connected to the turbine, and the other end being connected to the lifting platform, so that under the drive of the worm gear, the lifting platform is raised and lowered through the meshing of the worm gear and the turbine gear, and the threaded connection between the turbine gear and the lead screw.

[0014] According to an embodiment of the present invention, connecting seats are installed at both ends of the first support beam and the second support beam, and the lifting platform is connected to the connecting seats through multiple connecting arms to drive the upper roller to rise and fall.

[0015] According to an embodiment of the present invention, each of the connecting seats is equipped with a guide cylinder; the support frame includes: a plurality of support rods, which are respectively installed on the base, and each of the support rods extends along the height direction; and a top plate, which extends in the horizontal plane and is installed on the top of the plurality of support rods; wherein the guide cylinders are respectively sleeved on the support rods to guide the upper roller to rise and fall.

[0016] According to the above embodiment of the present invention, the forming apparatus for waterproof membrane includes an adjusting unit that drives the upper roller to move up and down to adjust the distance between the upper and lower rollers, thereby rolling waterproof membranes of different thicknesses. A water-cooling unit is further provided, and a coolant at a constant temperature is circulated into each lower roller to cool multiple lower rollers, thereby cooling the waterproof membrane and improving the cooling efficiency of the lower rollers on the waterproof membrane. Attached Figure Description

[0017] Figure 1 This is a perspective view of a forming device for waterproof membrane according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of the drive assembly of a forming device for waterproof roll material according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the installation of the adjustment section and the air-cooling section of the forming device for waterproof membrane according to an embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional view of the lower roller of the forming device for waterproof roll material according to an embodiment of the present invention;

[0021] Figure 5 This is a cross-sectional view of the upper roller of the forming device for waterproof membrane according to an embodiment of the present invention, taken along a longitudinal vertical plane; and

[0022] Figure 6 This is a cross-sectional view of the upper roller of the forming device for waterproof membrane according to an embodiment of the present invention, cut along a horizontal vertical plane.

[0023] In the picture:

[0024] 1-Base; 11-Support plate;

[0025] 2-Lower roller;

[0026] 3-Adjustment section;

[0027] 31-Support frame; 311-Support rod; 312-Top plate;

[0028] 32-Drive assembly; 321-Housing; 322-Turbine; 323-Worm gear; 324-Lead screw;

[0029] 33 - Lifting platform;

[0030] 34 - First supporting beam;

[0031] 35 - Second support beam;

[0032] 36 - Connecting arm;

[0033] 37-Connector; 371-Guide tube;

[0034] 4-Upper roller; 41-First end; 42-Second end; 43-Metal sheet;

[0035] 5-Water cooling section;

[0036] 51-Collector's channel;

[0037] 52 - Water tank;

[0038] 53-Water pump;

[0039] 54-Heat dissipation assembly; 541-Fan; 542-Heat sink; 5421-Fins;

[0040] 6-Air-cooled section; 61-Blower; 62-Guide pipe. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0042] According to one aspect of the inventive concept of this utility model, a forming apparatus for waterproof membrane is provided, comprising: a base; a plurality of lower rollers rotatably mounted on the base in a transverse direction, each lower roller extending in a longitudinal direction and having both ends protruding from the base; a plurality of upper rollers respectively facing the plurality of lower rollers; an adjusting unit mounted on the base and configured to adjust the distance between the upper rollers and the lower rollers by driving the upper rollers to move up and down, so as to roll waterproof membranes of different thicknesses; and a water cooling unit mounted on the base and connected to both ends of each lower roller protruding from the base, configured to circulate and deliver a coolant of constant temperature into each lower roller to cool the plurality of lower rollers, thereby cooling the waterproof membrane.

[0043] Figure 1 This is a perspective view of a forming device for waterproof membrane according to an embodiment of the present invention.

[0044] According to an exemplary embodiment of the present invention, please refer to Figure 1 A forming apparatus for waterproof membrane is provided, comprising a base 1, a plurality of lower rollers 2, a plurality of upper rollers 4, an adjusting unit 3, and a water-cooling unit 5. The plurality of lower rollers 2 are rotatably mounted sequentially on the base 1 in a transverse direction, each lower roller 2 extending in a longitudinal direction with both ends protruding from the base 1. The plurality of upper rollers 4 are respectively arranged facing the plurality of lower rollers 2. The adjusting unit 3 is mounted on the base 1 and configured to adjust the spacing between the upper rollers 4 and the lower rollers 2 by driving the upper rollers 4 to move up and down, thereby rolling waterproof membranes of different thicknesses. The water-cooling unit 5 is mounted on the base 1 and connected to the two ends of each lower roller 2 protruding from the base 1, and is configured to circulate a coolant at a constant temperature into each lower roller 2 to cool the plurality of lower rollers 2, thereby cooling the waterproof membrane.

[0045] In this embodiment, the adjusting unit 3 drives the upper roller 4 to move up and down to adjust the distance between the upper roller 4 and the lower roller 2, so as to roll waterproof membranes with different thicknesses. A water-cooling unit 5 is further provided, and coolant at a constant temperature is circulated into each lower roller 2 to cool the multiple lower rollers 2, thereby cooling the waterproof membrane and improving the cooling efficiency of the lower rollers 2 on the waterproof membrane.

[0046] In some exemplary embodiments, reference is made to Figure 1 The water-cooling section 5 includes two collection channels 51, a water tank 52, a water pump 53, and a heat dissipation assembly 54. The two collection channels 51 are respectively installed on both sides of the base 1 extending longitudinally and are connected to both ends of each lower roller 2. The water tank 52 is connected to one of the two collection channels 51. The water pump 53 is connected to the water tank 52. The heat dissipation assembly 54 is connected to both the water pump 53 and the other of the two collection channels 51, allowing the coolant to circulate through the lower roller 2.

[0047] In this embodiment, it should be noted that two collecting channels 51 are respectively installed on both sides of the base 1 extending in the longitudinal direction, and both ends of each lower roller 2 are connected to the two collecting channels 51 respectively. A water tank 52 is installed on the base 1, with one side connected to the far-end collecting channel 51. A water pump 53 is installed on the water tank 52 and connected to the water tank 52. A heat dissipation assembly 54 is installed on the base 1 and is connected to the water pump 53 and the near-end collecting channel 51 respectively. Under the action of the water pump 53, a cooling circuit that allows coolant to circulate is formed between the water tank 52, the heat dissipation assembly 54, the two collecting channels 51, and the lower roller 2 to cool the lower roller 2.

[0048] Furthermore, in this embodiment, the water pump 53 draws coolant from the water tank 52, delivers it to the lower roller 2 via the heat dissipation component 54, and after flowing out of the lower roller 2, it flows back to the water tank 52 to achieve circulating cooling of the lower roller 2. The heat dissipation component 54 also plays the role of dissipating heat and cooling the circulating coolant.

[0049] In some exemplary embodiments, reference is made to Figure 1 The heat dissipation assembly 54 includes a fan 541 and a heat sink 542. The heat sink 542 is installed on the side of the air outlet of the fan 541, and the heat sink 542 is connected to the water pump 53 and another manifold 51.

[0050] In this embodiment, the fan 541 is mounted on the base 1. The radiator 542 includes multiple fins 5421. The multiple fins 542 are connected sequentially in the transverse direction and mounted on the side wall of the fan 541 on the side of the air outlet. The first and last ends of the sequentially connected multiple fins 5421 are respectively connected to the water pump 53 and the near-end collection groove 51 to dissipate heat and cool the circulating coolant. The fan 541 is used to further reduce the temperature of the radiator 542.

[0051] Figure 2 This is a cross-sectional view of the drive assembly of a forming device for waterproof roll material according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the installation of the adjustment section and the air-cooling section of the forming device for waterproof membrane according to an embodiment of the present invention.

[0052] In some exemplary embodiments, reference is made to Figures 1-3 The adjusting unit 3 includes a support frame 31, a drive assembly 32, a lifting platform 33, a first support beam 34, and a second support beam 35. The support frame 31 is mounted on the base 1. The drive assembly 32 is mounted on the support frame 31. The lifting platform 33 is mounted on the drive assembly 32. The first support beam 34 and the second support beam 35 are connected to the lifting platform 33. The two ends of the plurality of upper rollers 4 are rotatably mounted on the first support beam 34 and the second support beam 35, respectively. Driven by the drive assembly 32, the plurality of upper rollers 4 reciprocate linearly in the height direction.

[0053] With the above configuration, the drive assembly 32 drives the lifting platform 33 to reciprocate linearly in the height direction, and drives multiple upper rollers 4 to reciprocate linearly in the height direction via the first support beam 34 and the second support beam 35, thereby making the upper rollers 4 move closer to or further away from the lower rollers 2 to adjust the distance between the upper rollers 4 and the lower rollers 2.

[0054] Figure 4 This is a cross-sectional view of the lower roller of the forming device for waterproof roll material according to an embodiment of the present invention; Figure 5This is a cross-sectional view of the upper roller of the forming device for waterproof membrane according to an embodiment of the present invention, taken along a longitudinal vertical plane.

[0055] In some exemplary embodiments, reference is made to Figure 1 as well as Figures 3-5 The first support beam 34 and the second support beam 35 are hollow and communicate with the interior of each upper roller 4. The air-cooling unit 6 is mounted on the lifting platform 33 and communicates with the first support beam 34. It is configured to cool the multiple upper rollers 4 by conveying a cooling medium into the interior of the first support beam 34, and the cooling medium is discharged through the second support beam 35.

[0056] With the above configuration, the cooling medium flows into the multiple upper rollers 4 through the first support beam 34 and is discharged through the second support beam 35 to cool the multiple upper rollers 4.

[0057] In some exemplary embodiments, reference is made to Figure 1 as well as Figure 3 The air-cooled section 6 includes a blower 61, which is connected to the first support beam 34 to deliver cooling airflow as a cooling medium into the interior of the first support beam 34.

[0058] In this embodiment, one end of the blower 61 is connected to the guide pipe 62, the first support beam 34 is connected to the first end 41 of each upper roller 4, the other end of the guide pipe 62 is connected to multiple upper rollers 4 via the first support beam 34, the second support beam 35 is connected to the second end 42 of each upper roller 4, and a ventilation opening (not shown in the figure) is formed on the second support beam 35 to allow airflow from multiple upper rollers 4 to flow out.

[0059] Figure 6 This is a cross-sectional view of the upper roller of the forming device for waterproof membrane according to an embodiment of the present invention, cut along a horizontal vertical plane.

[0060] In some exemplary embodiments, reference is made to Figures 5-6 Each upper roller 4 has multiple metal plates 43 arranged in the circumferential direction and extending in the radial direction installed on its inner wall to increase the contact area between the cooling airflow and the inner wall of the upper roller 4.

[0061] In this embodiment, multiple metal sheets 43 are sequentially arranged in the circumferential direction inside the upper roller 4, and each metal sheet 43 extends into the inner wall of the upper roller 4 in the radial direction to increase the contact area between the cooling airflow and the inner wall of the upper roller 4, thereby further improving the cooling efficiency of the upper roller 4.

[0062] In some exemplary embodiments, reference is made to Figures 1-3The drive assembly 32 includes a housing 321, a turbine 322, a worm gear 323, and a lead screw 324. The housing 321 is mounted on a support frame 31. The turbine 322 is installed inside the housing 321. The worm gear 323 meshes with the turbine 322, with one end extending out of the housing 321. One end of the lead screw 324 is threadedly connected to the turbine 322, and the other end is connected to the lifting platform 33, so that the lifting platform 33 is raised and lowered by the meshing of the worm gear 323 and the turbine 322, and the threaded connection between the turbine 322 and the lead screw 324, driven by the worm gear 323.

[0063] In this embodiment, the housing 321 is mounted on top of the support frame 31. A turbine 322 is mounted inside the housing 321, and a threaded hole extending axially is formed at the center of the turbine 322. A worm gear 323 is mounted inside the housing 321 and meshes with the turbine 322, with one end of the worm gear 323 extending out of the housing 321. A lead screw 324 extends along the height direction, passes through the threaded hole, and passes through the turbine 322 and the housing 321. Driven by the worm gear 323, the lead screw 324 reciprocates linearly in the height direction via the turbine 322, thereby raising and lowering the lifting platform 33.

[0064] In some exemplary embodiments, reference is made to Figure 1 as well as Figure 3 The first support beam 34 and the second support beam 35 are equipped with connecting seats 37 at both ends. The lifting platform 33 is connected to the connecting seats 37 through multiple connecting arms 36 to drive the upper roller 4 to rise and fall.

[0065] In this embodiment, the lifting platform 33 is constructed in a generally rectangular shape, extending in a horizontal plane and threadedly connected to the lead screw 324. Four connecting arms 36 are respectively formed at the four corner positions of the lifting platform 33, and each connecting arm 36 extends outward along the diagonal direction of the lifting platform 33. The first support beam 34 extends in the transverse direction, and its two ends are respectively connected to the ends of two adjacent connecting arms 36 through connecting seats 37. The first support beam 34 is connected to the first end 41 of each upper roller 4. The second support beam 35 is arranged facing the first support beam 34, and its two ends are respectively connected to the ends of the other two connecting arms 36 through connecting seats 37. The second support beam 35 is connected to the second end 42 of each upper roller 4.

[0066] In some exemplary embodiments, reference is made to Figure 1 as well as Figure 3 Each connecting seat 37 is equipped with a guide cylinder 371. The support frame 31 includes multiple support rods 311 and a top plate 312. The multiple support rods 311 are respectively mounted on the base 1, and each support rod 311 extends in the height direction. The top plate 312 extends in the horizontal plane and is mounted on top of the multiple support rods 311. The guide cylinders 371 are respectively sleeved on the support rods 311 to guide the upper roller 4 to rise and fall.

[0067] In this embodiment, the base 1 includes support plates 11 facing each other in the longitudinal direction and extending upward in the height direction, each support plate 11 being configured as generally rectangular. The support frame 31 includes four support rods 311 and a top plate 312. Each support plate 11 has a support rod 311 mounted on the top of each end extending in the lateral direction. Each support rod 311 extends in the height direction. The top plate 312 extends in the horizontal plane and is mounted on top of the four support rods 311 at its bottom.

[0068] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A forming device for waterproof membrane, characterized in that, include: Base (1); Multiple lower rollers (2) are rotatably mounted on the base (1) in a transverse direction, and each lower roller (2) extends in a longitudinal direction and extends out of the base (1) at both ends; Multiple upper rollers (4) are respectively arranged facing multiple lower rollers (2); An adjustment part (3) is installed on the base (1) and is configured to adjust the distance between the upper roller (4) and the lower roller (2) by driving the upper roller (4) to move up and down, so as to roll waterproof membranes with different thicknesses. as well as The water-cooling unit (5) is installed on the base (1) and is connected to the two ends of each of the lower rollers (2) extending out of the base (1). It is configured to circulate and deliver coolant at a constant temperature into each of the lower rollers (2) to cool the multiple lower rollers (2) and thus cool the waterproof membrane.

2. The forming device for waterproof membrane according to claim 1, characterized in that, The water-cooled section (5) includes: Two collection channels (51) are respectively installed on both sides of the base (1) extending in the longitudinal direction and are connected to both ends of each of the lower rollers (2); The water tank (52) is connected to one of the two collection channels (51); A water pump (53) is connected to the water tank (52); and The heat dissipation assembly (54) is connected to the water pump (53) and another of the two collection tanks (51), so that the coolant circulates through the lower roller (2).

3. The forming apparatus for waterproof membrane according to claim 2, characterized in that, The heat dissipation assembly (54) includes: Fan (541); and A radiator (542) is installed on the side of the air outlet of the fan (541), and the radiator (542) is connected to the water pump (53) and another of the collection tanks (51).

4. The forming apparatus for waterproof membrane according to any one of claims 1-3, characterized in that, The adjustment unit (3) includes: A support frame (31) is mounted on the base (1); A drive assembly (32) is mounted on the support frame (31); A lifting platform (33) is mounted on the drive assembly (32); and The first support beam (34) and the second support beam (35) are connected to the lifting platform (33). The two ends of the plurality of upper rollers (4) are rotatably mounted on the first support beam (34) and the second support beam (35), respectively. Under the drive of the drive assembly (32), the plurality of upper rollers (4) reciprocate linearly in the height direction.

5. The forming apparatus for waterproof membrane according to claim 4, characterized in that, The first support beam (34) and the second support beam (35) are constructed to be hollow and communicate with the interior of each of the upper rollers (4); The air-cooled unit (6), installed on the lifting platform (33) and connected to the first support beam (34), is configured to cool the plurality of upper rollers (4) by conveying a cooling medium into the interior of the first support beam (34), the cooling medium being discharged through the second support beam (35).

6. The forming apparatus for waterproof membrane according to claim 5, characterized in that, The air-cooled section (6) includes a blower (61) connected to the first support beam (34) to deliver a cooling airflow as a cooling medium into the interior of the first support beam (34).

7. The forming apparatus for waterproof membrane according to claim 5, characterized in that, Each of the upper rollers (4) has a plurality of metal plates (43) arranged in the circumferential direction and extending in the radial direction installed on the inner wall to increase the contact area between the cooling airflow and the inner wall of the upper roller (4).

8. The forming apparatus for waterproof membrane according to claim 4, characterized in that, The driving component (32) includes: The housing (321) is mounted on the support frame (31); A turbine (322) is installed inside the housing (321); A worm (323) meshes with the turbine (322), one end of the worm (323) extending out of the housing (321); and A lead screw (324) is provided, one end of which is threadedly connected to the turbine (322), and the other end is connected to the lifting platform (33). Driven by the worm gear (323), the lifting platform (33) is raised and lowered through the meshing of the worm gear (323) and the turbine gear (322), and the threaded connection between the turbine gear (322) and the lead screw (324).

9. The forming apparatus for waterproof membrane according to claim 6, characterized in that, Connecting seats (37) are installed at both ends of the first support beam (34) and the second support beam (35). The lifting platform (33) is connected to the connecting seats (37) through multiple connecting arms (36) to drive the upper roller (4) to rise and fall.

10. The forming apparatus for waterproof membrane according to claim 9, characterized in that, Each of the connecting seats (37) is equipped with a guide tube (371); The support frame (31) includes: Multiple support rods (311) are respectively mounted on the base (1), each of the support rods (311) extending in the height direction; and A top plate (312) extends in the horizontal plane and is mounted on top of the plurality of said support rods (311); The guide cylinder (371) is respectively sleeved on the support rod (311) to guide the upper roller (4) to rise and fall.