Geomembrane spreading device

Abstract

The invention belongs to the technical field of geomembrane carrying devices, and particularly relates to a geomembrane spreading device which comprises a supporting column, a rolling shaft matched with a U-shaped supporting part at the upper end of the supporting column and a pressing block assembly. And a U-shaped body is arranged on the U-shaped supporting part. The two ends of the rolling shaft are sleeved with bearing parts, and end blocks are arranged on the end faces. The bearing part is in contact with the opposite surfaces of the two arm plates, and the outer end surface of the end block is a spherical surface part. The pressing block assembly comprises a pressing block body, a push rod, a spring and an end cap. And the pressing block body is arranged between the end plate and the spherical surface part and is provided with an elastic cushion matched with the spherical surface part. The push rod is matched with the through hole structure in the end plate and can move left and right relative to the end plate, one end is connected with the pressing block body, and the other end is sleeved with a spring and provided with a threaded ring. The end cap is matched with the end plate through a threaded structure, acting force can be applied to the threaded ring, the push rod is driven to move, and the spring deforms. Controllable rotating resistance is applied to the end faces of the two ends of the rolling shaft, so that the stretching force borne by the geomembrane in the unfolding process is relatively stable.

Description

Technical Field

[0001] This invention belongs to the technical field of devices for transporting geomembranes, and specifically relates to a geomembrane spreading device. Background Technology

[0002] Geomembrane is a geosynthetic material formed by combining a plastic film as the impermeable substrate with a non-woven fabric. Its impermeability mainly depends on the impermeability of the plastic film. The impermeable plastic films used in existing geomembranes are mainly polyvinyl chloride, polyethylene, and EVA, which are flexible polymer chemical materials with low specific gravity, high elongation, high adaptability to deformation, corrosion resistance, low temperature resistance, and good frost resistance.

[0003] In the technical document of patent CN222934874U, entitled "A Geomembrane Deployment Device," a method is disclosed that overcomes the problem of geomembrane easily rebounding at the moment of cutting during deployment, leading to the membrane peeling off from the main body. See also... Figure 1 The aforementioned patented technical solution has two opposing pillars 20 on the base frame 10, and a U-shaped support is formed at the upper end of each pillar 20. A pair of feeding rollers 30 are arranged on the base frame 10 and corresponding to the front side of the pillars 20. A lead screw 40 is arranged in front of the feeding rollers 30, and a sliding blade 41 is arranged on the lead screw 40. The sliding blade 41 can slide in the left and right direction under the drive of the lead screw 40, and can cut through the gap between the outer peripheral surfaces of the two feeding rollers 30, and extend forward to the geomembrane body position in front of the lead screw 40, thus cutting the geomembrane. Firstly, two feeding rollers 30 clamp the geomembrane at the cut / severed position, preventing the cut end from rebounding freely. Secondly, rubber sleeves 51 are provided at both ends of the roller 50 that houses the geomembrane body, extending into the U-shaped support portion located at the upper end of the support column 20. This increases the resistance of the roller 50 to the rotational movement relative to the support column 20, weakening the inertial strength of the roller 50 during rotation. Finally, through the combined action of the feeding rollers 30 and the rubber sleeves 51, the problem of the geomembrane potentially excessively swinging backward due to the rebound force at the moment of cutting, leading to the separation of the geomembrane from its main body, is overcome.

[0004] However, because the outer circumferential surfaces at both ends of the roller 50 are indirectly in contact with the inner wall of the U-shaped insertion at the upper part of the support column 20 through the rubber sleeve 51, when the roller 50 rotates relative to the support column 20, the rubber sleeve 51 will also rotate relative to the support column 20. Simultaneously, because the rubber sleeve 51 inevitably undergoes elastic deformation, and the position of this elastic deformation changes continuously with its rotation, it will occur at the contact surface between the rubber sleeve 51 and the support column 20 (i.e., at the contact surface with the support column 20). Figure 2Unstable viscous resistance is generated between the contact surfaces of the arm plate 21 (as shown), causing large fluctuations in the magnitude of the resistance / torque experienced by the roller 50 during rotation, with no obvious periodicity. This easily leads to the roller 50 jumping or jamming relative to the support column 20. In other words, the poor stability of the rotational resistance exerted by the rubber sleeve 51 between the roller 50 and the support column 20 results in unstable tension on the geomembrane during unfolding, causing unstable motor load and potential burnout. Furthermore, the cut ends can easily detach / slip from the relative circumferences of the two feeding rollers 30, causing inconvenience to the geomembrane unfolding operation and reducing work efficiency. Summary of the Invention

[0005] To improve the stress condition of the roller during rotation, the present invention provides a geomembrane spreading device, which suppresses the adverse effects of rotational inertia on the geomembrane spreading process by applying controllable rotational resistance to the end faces of both ends of the roller, thereby helping to stabilize the tensile force borne by the geomembrane during spreading.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a geomembrane spreading device, comprising two pillars arranged opposite each other on a base frame, a pair of feeding rollers arranged on the base frame and located in front of the pillars, a screw located in front of the feeding rollers and capable of driving the sliding knife to move left and right, a roller matched with the U-shaped support part at the upper end of the pillars, and two pressure block assemblies respectively matched with the two ends of the rollers.

[0007] A U-shaped body is provided between the outer sides of the two arm plates of the U-shaped support. This creates a lateral gap between the end plate of the U-shaped body and the outer sides of the arm plates.

[0008] Bearing portions are fitted at both ends of the roller, and the outer circumferential surface of the outer ring of the bearing portion is tangentially contacted and matched with the opposite surfaces of the two arm plates of the U-shaped support portion.

[0009] Both ends of the roller are provided with end blocks, and the outer end face of the end blocks is formed into a spherical surface that protrudes to the left and right.

[0010] The briquetting assembly includes a briquetting body, a push rod, a spring, and an end cap.

[0011] The pressure block body is located between the end plate and the spherical part, and an elastic pad is provided on the end face of the pressure block body facing the spherical part. The push rod matches the through hole structure provided on the end plate, allowing the push rod to move left and right relative to the end plate. The inner end of the push rod is fixedly connected to the pressure block body, and a spring is sleeved on the outer end, with the end extending outside the through hole structure and provided with a threaded ring. The end cap matches the end plate through a threaded structure, and can apply force to the threaded ring, causing the push rod to move left and right relative to the end plate and the spring to expand and contract.

[0012] Optionally, the thickness of the elastic pad is not less than 5 mm, and the axial protrusion / protrusion of the apex of the spherical surface relative to the end face of the roller is not less than 3 mm, so that there is sufficient elastic deformation space between the elastic pad and the spherical surface, and the magnitude of the anti-torsional resistance applied by the pressure block assembly or the pressure block body at the end of the roller can be adjusted.

[0013] Optionally, the outer port of the through-hole structure is formed with a countersunk hole, and one end of the spring contacts the inner bottom surface of the countersunk hole, while the other end contacts the end face of the screw ring.

[0014] Optionally, an annular flange extending axially in the left-right direction and corresponding to the outer port of the through-hole structure is provided on the end plate. The end cap matches the threaded surface on the annular flange, allowing the end cap to move relative to the annular flange in the left-right direction. An axial flange is formed on the inner bottom surface of the end cap. The axial flange can extend into the annular flange, and its end can contact and match the end face of the threaded ring. Thus, when the end cap is screwed to move relative to the annular flange, the axial flange pushes the threaded ring, driving the push rod to move relative to the end plate, pushing the pressure block body gradually closer to the spherical surface, and allowing the elastic pad on the pressure block body to contact and match the spherical surface. During this process, the spring is further compressed and has a large extension elastic force. When the end cap is screwed in the opposite direction, the length of the axial flange extending into the annular flange gradually decreases. Under the action of the spring's extension elastic force, the threaded ring drives the push rod to move relative to the end plate, causing the pressure block body to gradually move away from the spherical surface. Specifically, when the port of the through hole structure is provided with a countersunk hole, the annular flange is provided at the outer port of the countersunk hole; at this time, the inner diameter of the annular flange can be not less than the inner diameter of the countersunk hole.

[0015] Optionally, a plurality of spheres, arranged alternately around the circumference, are fixedly embedded on the free end face of the axial flange. Each sphere has a portion protruding outside the free end face of the axial flange and can make tangential contact with the end face of the helical ring.

[0016] Optionally, the pressure block body is provided with multiple guide posts arranged alternately around the circumference. The axial extension direction of the guide posts is in the left-right direction. The end plate is provided with smooth countersunk holes that correspond one-to-one with the guide posts. The free ends of the guide posts are inserted into the smooth countersunk holes.

[0017] Optionally, vertically extending grooves are formed on opposite surfaces of the arm plate. The outer circumferential surface of the bearing ring can be partially inserted into the groove.

[0018] Optionally, the bearing section includes a pair of bearings, which are fitted side by side onto the shaft end of the roller, with one bearing outer end face contacting a shoulder formed by the shaft end of the roller, and the other bearing outer end face contacting a threaded cylinder provided on the shaft end of the roller.

[0019] Optionally, the roller has multiple axially alternating bladder rings, and the roller has air passages communicating with the multiple bladder rings. An inflation / deflation valve port matching the air passages is provided at the end of the roller. The outer diameter of the bladder rings in their fully inflated state is larger than the outer diameter of the roller. Preferably, the number of bladder rings is three or more.

[0020] The beneficial effects of this invention are: it can improve the stress condition of the roller during rotation. Specifically, the geomembrane spreading device of this application can apply controllable rotational resistance to the end faces of both ends of the roller, thereby suppressing the adverse effects of rotational inertia on the geomembrane spreading process. At the same time, it helps to stabilize the tensile force borne by the geomembrane during spreading, which helps to prevent the cut end of the geomembrane from slipping out between the relative circumferential surfaces of the two feeding rollers, thus ensuring a smooth spreading process of the geomembrane and improving the efficiency of the spreading operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the axonal structure of an existing geomembrane spreading device.

[0022] Figure 2 This is a schematic diagram of the partial cross-sectional structure in the main view of this application.

[0023] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0024] Figure 4 This is a top view of the structure of this application.

[0025] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point B in the middle.

[0026] In the diagram: 10 Base frame; 20 Support column; 21 Arm plate; 211 Slot; 22 U-shaped body; 221 End plate; 2211 Countersunk hole; 2212 Annular flange; 30 Feed roller; 40 Lead screw; 41 Sliding knife; 50 Roller; 51 Rubber sleeve; 52 Burr ring; 521 Air filling / deleting valve port; 53 Bearing part; 54 Screw barrel; 55 End block; 551 Spherical part; 60 Pressing block assembly; 61 Pressing block body; 611 Elastic pad; 612 Guide post; 62 Push rod; 621 Threaded ring; 63 Spring; 64 End cap; 641 Axial flange. Detailed Implementation

[0027] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0028] See Figure 1 , and such Figures 2 to 5 The illustrated geomembrane spreading device includes two support columns 20, a pair of feeding rollers 30, and a lead screw 40 (or lead screw unit) both mounted on a base frame 10, as well as a roller 50 that matches the geomembrane body assembly. The two support columns 20 are arranged opposite each other, and each support column 20 has a U-shaped support portion at its upper end, allowing the U-shaped grooves of the two U-shaped supports to communicate with each other in the left-right direction. The pair of feeding rollers 30 are mounted on the base frame 10 and positioned opposite each other in front of the support columns 20. The lead screw 40 is mounted on the base frame 10 and positioned in front of the feeding rollers 30. A sliding cutter 41 is mounted on the lead screw 40, and when the lead screw 40 is driven to rotate, it drives the sliding cutter 41 to move in the left-right direction, thereby cutting the geomembrane. The left and right ends of the roller 50 can be inserted into the U-shaped grooves of the U-shaped support portion at the upper end of the support column 20, thereby supporting the geomembrane body fitted on the roller 50 at a certain height position, higher than the height position of the two feeding rollers 30, with the help of the two support columns 20. More detailed technical content involved in this paragraph can be found in the patent documents in the background art, and will not be repeated here. It should be emphasized that the technical solution of this application does not include the rubber sleeve 51 fitted on the end of the roller 50.

[0029] like Figures 2 to 5 As shown, the technical solution of this application also includes a pair of pressing block assemblies 60, and the pair of pressing block assemblies 60 are respectively matched with the left and right ends of the roller 50.

[0030] A U-shaped body 22 is provided between the outer sides of the two arm plates 21 of the U-shaped support (between the left sides of the two left arm plates 21 and between the right sides of the two right arm plates 21). The two arms of the U-shaped body 22 are connected to the arm plates 21 by bolts or screws, and a left-right gap exists between the end plate 221 of the U-shaped body 22 and the outer side of the arm plate 21.

[0031] The roller 50 is fitted with bearing portions 53 at both ends, and the outer circumferential surface of the bearing portion 53 is tangentially contacted and matched with the (front and rear) opposing surfaces of the two arm plates 21 of the U-shaped support. Simultaneously, the outer circumferential surface of the bearing portion 53 can also contact and match with the bottom surface of the U-shaped groove of the U-shaped support, thus supporting the roller 50 between the two columns 20 through the bearing portions 53. The shaft end of the roller 50 is fitted with the inner ring of the bearing portion 53 and fixedly connected together. When the roller 50 rotates relative to the support column 20, there is no contact surface with the arm plate 21 that moves relative to it, ensuring smooth and flexible rotation of the roller 50 and greatly reducing the relative movement resistance between it and the arm plate 21. End blocks 55 are fixedly provided on both end faces of the roller 50, and the outer end face of the end block 55 is formed as an outwardly protruding spherical surface 551.

[0032] like Figure 2 , Figure 4 As shown, vertically extending grooves 211 can be formed on the opposite surfaces of the arm plates 21. The outer circumferential surface of the bearing portion 63 can be partially inserted into the grooves 211. The depth of the grooves 211 is controlled between 1 mm and 3 mm. To allow the bearing portion 53 to be smoothly inserted (from top to bottom) into the two grooves 211 on the two opposing arm plates 21, the upper end of the grooves 211 can be set as a flared structure. This setting can reduce the swing / jump amplitude of the roller 50 in the left and right direction, making the geomembrane spreading process more stable, helping to improve the cutting end quality of the geomembrane cut by the sliding blade 41, and ensuring that the sliding blade 41 reliably and fully cuts the geomembrane laterally, helping to prevent incomplete cutting.

[0033] The pressing block assembly 60 includes a pressing block body 61, a push rod 62, a spring 63, and an end cap 64.

[0034] The pressure block body 61 is disposed between the end plate 221 and the spherical surface 551, and an elastic pad 611 is provided on the end face of the pressure block body 61 facing the spherical surface 551. The pressure block body 61 can reciprocate linearly between the end plate 221 and the spherical surface 551, so that the elastic pad 611 can selectively switch between a state of contact with the spherical surface 551 and a state of separation / non-contact, and the degree of pressure contact between the elastic pad 611 and the spherical surface 551 in the contact state can be controlled.

[0035] The push rod 62 matches the through hole structure provided on the end plate 221, and the through hole structure has a channel section that can establish a profile contact relationship with the outer peripheral surface of the push rod 62, so that the push rod 62 can move left and right relative to the end plate 221 by a certain stroke. The inner end of the push rod 62 is fixedly connected to the pressure block body 61 by a threaded structure. The spring 63 is sleeved on the outer end side of the push rod 62, with the end extending outside the through hole structure, and a threaded ring 621 is provided. The end cap 64 matches the end plate 221 by a threaded structure, and can apply force to the threaded ring 621, thereby driving the push rod 62 to move left and right relative to the end plate 221 and compressing the spring 63 to produce extension and contraction deformation.

[0036] Specifically, the outer port of the through-hole structure has a countersunk hole 2211, and one end of the spring 63 contacts the inner bottom surface of the countersunk hole 2211, while the other end contacts the end face of the threaded ring 621. An annular flange 2212 is formed on the end plate 221 at the outer port of the countersunk hole 2211. The end cap 64 matches the external thread surface on the annular flange 2212, and an axially extending axial flange 641 is formed on the inner bottom surface of the end cap 64. The axial flange 641 can extend into the annular flange 2212, and its end contacts and matches the end face of the threaded ring 621. Thus, when the end cap 64 is screwed on to move relative to the annular flange 2212, the length of the axial flange 641 extending into the annular flange 2212 can change. During this process, it can push the threaded ring 621, causing the push rod 62 to drive the pressure block body 61 to move left and right, and causing the degree of extension and contraction of the spring 63 to change accordingly. The extension force of the spring 63 is the driving force for the pressure block body 61 to switch to a state of disengagement from the spherical surface 551.

[0037] In the technical solution of this application, the amount of movement of the pressure block body 61 in the left and right direction is accurately controlled by the end cap 64, that is, the degree of deformation of the elastic pad 611 by the spherical part 551 is controlled. At the same time, the contact surface between the spherical part 551 and the elastic pad 611 is spherical. When the roller 50 rotates, it can ensure that the anti-torsional resistance is mainly concentrated in the circumferential direction, which makes it less likely to cause radial and axial runout of the roller 50, so that its rotation is smooth. Therefore, controllable rotational resistance can be applied to the end faces of the roller 50.

[0038] Multiple spheres are fixedly embedded in the free end face of the axial flange 641, arranged alternately around the circumference. Each sphere has a portion protruding outside the free end face of the axial flange 641 and can make tangential contact with the end face of the screw ring 621. This reduces the contact resistance between the opposing surfaces of the axial flange 641 and the screw ring 621 when the axial flange 641 rotates relative to the screw ring 621, thereby reducing friction and wear.

[0039] To better guide the movement of the pressure block body 61 in the left-right direction, the pressure block body 61 is provided with multiple guide posts 612 arranged alternately around the circumference. The axial extension direction of the guide posts 612 is in the left-right direction. The end plate 221 is provided with smooth countersunk holes that correspond one-to-one with the guide posts 612. The free end of the guide post 612 is inserted into the smooth countersunk hole.

[0040] The bearing section 53 includes a pair of bearings, which are fitted side by side onto the shaft end of the roller 50. The outer end face of one bearing contacts the shoulder formed on the shaft end of the roller 50, and the outer end face of the other bearing contacts the threaded cylinder 54 on the shaft end of the roller 50. The two bearings (rings) are fixed at the shaft end position of the roller 50 by the shoulder and the threaded cylinder 54.

[0041] At least three bladder rings 52 are arranged alternately along the axial direction on the roller 50, and these bladder rings 52 are distributed along the axial direction of the roller 50 near the two shaft ends and at a central position. An air passage / pipe is provided inside the roller 50, communicating with the bladder rings 52, and an inflation / deflation valve port 521 matching the air passage is provided at the shaft end of the roller 50. An external air pump can inject air into the bladder rings 52 through the inflation / deflation valve port 521 and the air passage, causing the bladder rings 52 to inflate. The outer diameter of the bladder rings 52 in the fully inflated state is larger than the outer diameter of the roller 50. In this way, the geomembrane body fitted onto the roller 50 can be supported by the bladder ring 52 and connected to the roller 50 as a whole, enabling the two to rotate stably and synchronously. This improves the rotational stability of the geomembrane during the unfolding process and the stability of the geomembrane's motion state during release. Furthermore, it helps to further improve the stress condition of the roller 50 during rotation, suppressing the adverse effects of rotational inertia and rotational motion instability on the geomembrane unfolding process. This helps to make the tensile force borne by the geomembrane during unfolding relatively stable and controllable, preventing the cut end of the geomembrane from slipping out between the relative circumferences of the two feeding rollers 30, thus ensuring a smooth unfolding process and improving the efficiency of the unfolding operation. The inflation / deflation valve 521 can open under external force to release the gas inside the bladder ring 52, allowing the bladder ring 52 to return to its original contracted state. At this time, the bladder ring 52 can be in a state where it is merely wrapped / wound around the outer circumference of the roller 50.

[0042] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Many aspects of the present invention can be improved without departing from the overall concept. Those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A geomembrane spreading device, comprising two pillars (20) arranged opposite each other, a pair of feeding rollers (30) located in front of the pillars (20), a screw (40) located in front of the feeding rollers (30) and capable of driving a sliding cutter (41) to move left and right, and a roller (50) matching the U-shaped support portion at the upper end of the pillars (20); characterized in that: It also includes two pressure block assemblies (60) that are respectively matched to both ends of the roller (50); A U-shaped body (22) is provided between the outer sides of the two arm plates (21) of the U-shaped support, and there is a left and right gap between the end plate (221) of the U-shaped body (22) and the arm plate (21); Both ends of the roller (50) are fitted with bearing portions (53), and each end face is provided with an end block (55); the bearing portion (53) is in tangential contact with the opposite surfaces of the two arm plates (21); the outer end face of the end block (55) is an outwardly protruding spherical part (551). The briquetting assembly (60) includes a briquetting body (61), a push rod (62), a spring (63), and an end cap (64). The pressure block body (61) is located between the end plate (221) and the spherical part (551), and an elastic pad (611) is provided on its end face facing the spherical part (551); the push rod (62) matches the through hole structure provided on the end plate (221), so that the push rod (62) can move left and right relative to the end plate (221); the inner end of the push rod (62) is connected to the pressure block body (61), and the outer end is fitted with a spring (63) and the end extends out of the through hole structure, and a threaded ring (621) is provided; the end cap (64) matches the end plate (221) through the threaded structure, so that a force can be applied to the threaded ring (621), driving the push rod (62) to move relative to the end plate (221) and the spring (63) to deform.

2. The geomembrane spreading device according to claim 1, characterized in that: The thickness of the elastic pad (611) is not less than 5 mm, and the axial protrusion of the apex of the spherical surface (551) relative to the end face of the roller (50) is not less than 3 mm.

3. The geomembrane spreading device according to claim 1, characterized in that: The outer port of the through hole structure has a countersunk hole (2211), and one end of the spring (63) is in contact with the inner bottom surface of the countersunk hole (2211), while the other end is in contact with the end face of the screw ring (621).

4. The geomembrane spreading device according to claim 1 or 3, characterized in that: An annular flange (2212) is provided on the end plate (221) extending axially in the left and right direction and corresponding to the outer port of the through hole structure; the end cap (64) matches the threaded surface on the annular flange (2212) so that the end cap (64) can move in the left and right direction relative to the annular flange (2212); An axial flange (641) is formed on the inner bottom surface of the end cap (64); the axial flange (641) can extend into the annular flange (2212), and its end can contact and match the end face of the threaded ring (621).

5. The geomembrane spreading device according to claim 4, characterized in that: Multiple spheres are fixedly embedded on the free end face of the axial flange (641) and are arranged alternately around the circumference; some of the spheres are exposed outside the free end face of the axial flange (641) and can be in tangential contact with the end face of the helical ring (621).

6. The geomembrane spreading device according to claim 1, characterized in that: The pressure block body (61) is provided with a plurality of guide posts (612) arranged alternately around the circumference; the axial extension direction of the guide posts (612) is in the left-right direction; The end plate (221) is provided with a smooth countersunk hole that corresponds to the guide post (612) one by one; the free end of the guide post (612) is inserted into the smooth countersunk hole.

7. The geomembrane spreading device according to claim 1, characterized in that: Vertically extending grooves (211) are formed on the opposite surfaces of the arm plate (21); the outer circumferential surface of the bearing part (63) can be partially inserted into the grooves (211).

8. The geomembrane spreading device according to claim 7, characterized in that: The bearing section (53) includes a pair of bearings, which are fitted side by side onto the shaft end of the roller (50), with one side of the bearing outer end face contacting the shoulder formed by the shaft end of the roller (50) and the other side of the bearing outer end face contacting the screw (54) threadedly provided on the shaft end of the roller (50).

9. The geomembrane spreading device according to claim 1, characterized in that: Multiple bladder rings (52) are arranged axially alternately on the roller (50), and an air passage communicating with the multiple bladder rings (52) is provided inside the roller (50), and an inflation / deflation valve port (521) matching the air passage is provided at the shaft end of the roller (50); the outer diameter of the bladder ring (52) when fully inflated is larger than the outer diameter of the roller (50).

10. The geomembrane spreading device according to claim 9, characterized in that: The number of capsule rings (52) is three or more.

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