Concrete curing device for building construction

Abstract

The utility model relates to the technical field of concrete curing, and discloses a building construction concrete curing device which comprises a winding drum with an opening formed in the side wall, the winding drum is used for containing one wound section of a curing film, and the other section of the curing film penetrates through the opening; the guide roller assembly is located at the opening and used for guiding when the other section of the curing film is laid; the cutting component comprises a sliding rail, a cutting blade sliding along the track of the sliding rail and a driving assembly used for driving the cutting blade to slide along the track of the sliding rail, the sliding rail comprises at least one section of cutting rail arranged in the length direction of the guide roller assembly, and when the cutting blade slides along the track of the cutting rail, the cutting blade is driven by the driving assembly; and the other section of the curing film can be cut from one end to the other end. When the cutting assembly is used for cutting the maintenance film, a mode of cutting from one end to the other end is adopted, so that the instantaneous contact area between the cutting blade and the maintenance film is reduced in the cutting process, the cutting difficulty is reduced, and the operation convenience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete curing, in particular to a concrete curing device for building construction. Background Art

[0002] In construction projects, the maintenance of concrete columns is crucial for ensuring their structural stability and performance. After pouring, effective film curing is key to ensuring that concrete columns reach their designed strength and prevent premature cracking. This process effectively enhances the early strength and durability of concrete columns, ensuring structural stability and safety.

[0003] Patent publication number CN118441908A discloses a concrete curing device for construction. A lifting plate adjusts the height of the first and second half frames to prepare for subsequent film coating operations. During the raising of the first half frame, an adjustment mechanism, in conjunction with the first and second half gear rings, adjusts the state of the film coating and cleaning mechanisms. During this process, the film roll rises and rotates to complete the coating operation. The cleaning mechanism cleans dust from the surface of the concrete column to reduce its impact on the coating operation. After the coating operation is completed, a cutting assembly can sever the connection between the film roll and the concrete column. The cutting assembly includes a column and a cutting rod, which is fixed to the top of a third gear plate. The cutting rod is fixed to the top of the column, and the surface of the column contacts the inner wall of the slot. When the gear ring rotates, the column drives the cutting rod to rotate, thereby severing the portion of the film roll that extends beyond the film roll.

[0004] Because film rolls (also known as "curing film") are typically made of polyvinyl chloride (PVC) and polyethylene (PE), they possess a certain toughness and are resistant to breakage. Therefore, film roll cutting typically involves a blade moving from one end of the roll to the other. However, if the cutting rod, as in the aforementioned patented method, were to contact the entire surface of the film roll, the contact area would be increased, making it difficult for the cutting rod to penetrate the roll, resulting in difficulty in cutting. Utility Model Content

[0005] The utility model aims to provide a concrete curing device for building construction to overcome the above-mentioned shortcomings.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is:

[0007] A concrete curing device for building construction, comprising:

[0008] A winding drum with an opening is provided on the side wall for holding a section of the curing film, and another section of the curing film passes through the opening;

[0009] a guide roller assembly located at the opening, used for guiding when another section of the curing membrane is laid; and

[0010] The cutting component includes a slide rail, a cutting blade sliding along the slide rail track, and a driving assembly for driving the cutting blade to slide along the slide rail track. The slide rail includes at least one section of cutting rail arranged along the length direction of the guide roller assembly. When the cutting blade slides along the cutting rail track, it can cut the other section of the curing film from one end to the other.

[0011] Furthermore, the cutting component also includes a plurality of connecting rods fixedly connected to the outer side wall of the winding drum, and the sliding rail also includes a storage rail connected end to end with the cutting rail, and the storage rail is located on the side of the cutting rail away from the other section of the curing film, and the storage rail and the cutting rail are both fixedly connected to the plurality of connecting rods, and a sliding block is slidably connected to the storage rail and the cutting rail, and the sliding block is connected to the cutting blade, and the driving assembly is used to drive the sliding block to slide along the storage rail and the cutting rail.

[0012] Furthermore, the cutting component also includes a telescopic plate, one end of the telescopic plate is located in the surrounding area of the cutting rail and the storage rail, and one end of the telescopic plate is rotatably connected to the connecting rod, the other end of the telescopic plate is rotatably connected to the sliding block, and the other end of the telescopic plate is connected to the cutting blade, and the driving assembly is used to drive the other end of the telescopic plate to rotate around one end of the telescopic plate.

[0013] Furthermore, the cutting component further includes:

[0014] A first bevel gear rotatably connected to one end of the telescopic plate, wherein the first bevel gear is coaxially fixedly connected to a first rotating shaft, and the first rotating shaft is fixedly connected to a connecting rod;

[0015] A second bevel gear rotatably connected to the other end of the telescopic plate, wherein the second bevel gear is coaxially fixedly connected to a second rotating shaft, and the second rotating shaft is fixedly connected to a mounting base, and the cutting blade is mounted on the mounting base, and the cutting blade faces the other end of the curing film; and

[0016] A telescopic transmission shaft rotatably connected to the telescopic plate, the telescopic transmission shaft extends along the length direction of the telescopic plate, and the keys at both ends of the telescopic transmission shaft are connected to the third bevel gear and the fourth bevel gear in a one-to-one correspondence. The first bevel gear and the third bevel gear are meshed for transmission, and the second bevel gear and the fourth bevel gear are meshed for transmission. The transmission ratio between the first bevel gear and the third bevel gear is equal to the transmission ratio between the second bevel gear and the fourth bevel gear.

[0017] Furthermore, the driving assembly includes:

[0018] A driven gear coaxially sleeved on the circumference of the first rotating shaft and fixedly connected to the telescopic plate; and

[0019] A driving motor is fixedly connected to the connecting rod, and the driving motor is transmission-connected to a driving gear, and the driving gear is meshed with a driven gear.

[0020] Furthermore, a plurality of connecting seats are fixedly mounted on a side of the telescopic plate away from the connecting rod, the plurality of connecting seats are spaced apart along the length direction of the telescopic plate, and the plurality of connecting seats are rotatably connected to the telescopic transmission shaft.

[0021] Furthermore, the telescopic plate comprises a plurality of telescopic plate monomers, and adjacent telescopic plate monomers are connected in a sliding manner;

[0022] The telescopic transmission shaft comprises a plurality of transmission shaft units, and adjacent transmission shaft units are slidably plugged into each other.

[0023] Furthermore, the guide roller assembly includes:

[0024] Two parallel and spaced guide rollers, the guide rollers being located at the opening, the guide rollers being used to pass through another section of the curing film and frictionally connect with the other section; and

[0025] Two support plates are rotatably connected to the upper and lower ends of the guide roller in a one-to-one correspondence, and the two support plates are fixedly connected to the connecting rod.

[0026] Furthermore, the top plate and the bottom plate of the winding drum are movably penetrated by an upper plug rod and a lower plug rod, and the upper plug rod and the lower plug rod are detachably connected by threads. The upper plug rod and the lower plug rod are both arranged parallel to the axis direction of the guide roller, and the upper plug rod and the lower plug rod are used to connect a section of the curing film winding.

[0027] Furthermore, it also includes an operating rod, one end of which is hinged to the outer side wall of the winding drum away from the opening.

[0028] Compared with the prior art, the present invention has at least the following advantages:

[0029] This utility model utilizes a guide roller assembly to guide the curing film during its laying process. After the curing film is wrapped around the concrete column, the cutting assembly is used to cut the curing film, thereby completing the curing film covering process on the concrete column. The cutting assembly cuts the curing film from one end to the other, thus reducing the instantaneous contact area between the cutting blade and the curing film during the cutting process, reducing the cutting difficulty and improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the overall structure of the utility model construction concrete curing device;

[0032] Figure 2 This is a schematic diagram of the overall structure of the concrete curing device for construction of the utility model from another perspective;

[0033] Figure 3 This is a schematic structural diagram of the cutting assembly of the utility model;

[0034] Figure 4 This is a structural diagram of the cutting assembly of the utility model from another perspective;

[0035] Figure 5 This is a schematic structural diagram of the telescopic plate of the utility model;

[0036] Figure 6 This is a schematic structural diagram of the telescopic transmission shaft of the utility model;

[0037] Figure 7 It is a schematic diagram of the explosion structure of the upper insertion rod and the lower insertion rod of the utility model.

[0038] Figure numerals: 1, winding drum; 2, curing film; 3, cutting blade; 4, cutting rail; 5, storage rail; 6, connecting rod; 7, sliding block; 8, telescopic plate; 9, first bevel gear; 10, first rotating shaft; 11, second bevel gear; 12, second rotating shaft; 13, connecting seat; 14, telescopic transmission shaft; 15, third bevel gear; 16, fourth bevel gear; 17, driving motor; 18, driving gear; 19, driven gear; 20, guide roller; 21, support plate; 22, upper insertion rod; 23, lower insertion rod; 24, operating lever. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0041] Reference Figure 1-2 The present invention provides a concrete curing device for construction, which is preferably suitable for the curing film winding and curing process of concrete columns. The specific structure includes a winding drum 1, a guide roller assembly, and a cutting component. The winding drum 1 is a cylindrical structure with an opening on its side wall. The winding drum 1 is used to hold a section of the curing film 2 wound therein, and the other section of the curing film 2 is arranged through the opening; the guide roller assembly is located at the opening and is used to guide the other section of the curing film 2 when it is laid; the cutting component includes a slide rail, a cutting blade 3 that slides along the slide rail track, and a drive assembly for driving the cutting blade 3 to slide along the slide rail track. The slide rail includes at least one section of cutting rail 4 arranged along the length direction of the guide roller assembly. When the cutting blade 3 slides along the cutting rail 4 track, it can cut the other section of the curing film 2 from one end to the other.

[0042] Preferably, the cutting part also includes multiple connecting rods 6, the connecting rods 6 are made of angle steel, the multiple connecting rods 6 are arranged perpendicular to the length direction of the guide roller assembly, the multiple connecting rods 6 are arranged at intervals along the length direction of the guide roller assembly, and the connecting rods 6 are fixedly connected to the outer wall of the winding drum 1.

[0043] The slide rail also includes a storage rail 5, which is located on the side of the cutting rail 4 away from the other section of the curing film 2. The storage rail 5 and the cutting rail 4 are connected end to end to form an annular slide rail structure. The storage rail 5 and the cutting rail 4 are both fixedly connected to a plurality of connecting rods 6. Sliding blocks 7 are slidably connected to the storage rail 5 and the cutting rail 4. The sliding blocks 7 are connected to the cutting blade 3. The drive assembly is used to drive the sliding blocks 7 to slide along the storage rail 5 and the cutting rail 4. When the drive assembly drives the sliding blocks 7 to slide on the cutting rail 4, the cutting blade 3 can cut the other section of the curing film 2.

[0044] Reference Figure 3-5 The cutting component of the present invention also includes a telescopic plate 8, one end of the telescopic plate 8 is located in the surrounding area of the cutting rail 4 and the storage rail 5, and is rotatably connected to the connecting rod 6, the other end of the telescopic plate 8 is rotatably connected to the sliding block 7, and is connected to the cutting blade 3, and the driving assembly is used to drive the other end of the telescopic plate 8 to rotate around one end of the telescopic plate 8.

[0045] The telescopic plate 8 includes multiple telescopic plate monomers, and adjacent telescopic plate monomers are slidably connected to each other; one of the two adjacent telescopic plate monomers is provided with a slide groove, which extends along the length direction of the telescopic plate monomer, and the other of the two adjacent telescopic plate monomers is fixedly connected with a slider, which is slidably connected to the slide groove.

[0046] In order to ensure that when the sliding block 7 slides along the cutting rail 4, the cutting blade 3 always faces the other end of the curing film 2. Figure 3-4 The cutting component also includes a first bevel gear 9, a second bevel gear 11, a telescopic transmission shaft 14, a third bevel gear 15 and a fourth bevel gear 16. Among them, the first bevel gear 9 is rotatably connected to one end of the telescopic plate 8, and the first bevel gear 9 is coaxially fixedly connected to the first rotating shaft 10. The first rotating shaft 10 is rotatably connected to one end of the telescopic plate 8, and the first rotating shaft 10 passes through one end of the telescopic plate 8 and is fixedly connected to the connecting rod 6; the second bevel gear 11 is rotatably connected to the other end of the telescopic plate 8, and the second bevel gear 11 is coaxially fixedly connected to the second rotating shaft 12. The second rotating shaft 12 is fixedly connected to a mounting seat, and a cutting blade 3 is installed on the mounting seat. The cutting blade 3 faces the other end of the curing film 2. When the cutting edge of the cutting blade 3 contacts the curing film 2, it can The telescopic transmission shaft 14 extends along the length of the telescopic plate 8 and is rotatably connected to the telescopic plate 8. The third bevel gear 15 and the fourth bevel gear 16 are keyed to both ends of the telescopic transmission shaft 14. The third bevel gear 15 and the fourth bevel gear 16 can rotate synchronously and have the same angular velocity. The first bevel gear 9 and the third bevel gear 15 are meshed for transmission, and the second bevel gear 11 and the fourth bevel gear 16 are meshed for transmission. The transmission ratio between the first bevel gear 9 and the third bevel gear 15 is equal to the transmission ratio between the second bevel gear 11 and the fourth bevel gear 16. This design ensures that when the sliding block 7 slides along the cutting rail 4 and the storage rail 5, the cutting blade 3 on the second bevel gear 11 is always facing the other end of the curing film 2. On the one hand, when the sliding block 7 slides onto the cutting rail 4, the cutting blade 3 always faces the other section of the curing film 2; on the other hand, when the sliding block 7 slides onto the storage rail 5, the cutting blade 3 still faces the other section of the curing film 2. At this time, the cutting blade 3 can be stored in the space enclosed by the cutting rail 4 and the storage rail 5. At this time, the cutting blade 3 does not contact the curing film 2, which can avoid damage to the curing film 2 during the laying process of the curing film 2, and at the same time avoid cutting the operator, reducing the risk of use during operation.

[0047] Optionally, the first bevel gear 9 , the second bevel gear 11 , the third bevel gear 15 and the fourth bevel gear 16 are four bevel gears of the same specifications and models.

[0048] Reference Figure 4 The driving assembly includes a driven gear 19, a driving motor 17 and a driving gear 18. The driven gear 19 is coaxial and spaced around the first rotating shaft 10, and the driven gear 19 can be fixedly connected to one end of the telescopic plate 8; the driving motor 17 is fixedly connected to the connecting rod 6, and the driving motor 17 is transmission-connected to the driving gear 18, and the driving gear 18 is engaged with the driven gear 19.

[0049] When the driving motor 17 is started, it can drive the driving gear 18 to rotate, and the driving gear 18 transmits power to the driven gear 19. When the driven gear 19 rotates, the telescopic plate 8 can rotate around the first rotating axis 10. At this time, the sliding block 7 can slide along the cutting rail 4 and the storage rail 5.

[0050] Specifically, a plurality of connection seats 13 are fixedly installed on one side of the telescopic plate 8 away from the connecting rod 6. The plurality of connection seats 13 are spaced apart along the length direction of the telescopic plate 8, and the plurality of connection seats 13 are rotatably connected to the telescopic transmission shaft 14. Figure 6 The telescopic transmission shaft 14 includes multiple transmission shaft monomers, and adjacent transmission shaft monomers are slidably connected to each other.

[0051] Refer again Figure 1 The guide roller assembly includes two guide rollers 20 and two support plates 21. The two guide rollers 20 are located at the opening and are arranged in parallel. The axis of the guide roller 20 is located in the length direction of the guide roller assembly. The two guide rollers 20 are arranged at intervals. The other section of the curing film 2 is passed through the two guide rollers 20 and is frictionally connected with it; the two support plates 21 are respectively installed at the upper and lower ends of the guide rollers 20 for rotation connection, and the two support plates 21 are fixedly connected to the connecting rod 6.

[0052] Preferably, refer to Figure 7 The top plate and bottom plate of the winding drum 1 are respectively movably penetrated by an upper insertion rod 22 and a lower insertion rod 23, and the upper insertion rod 22 and the lower insertion rod 23 are detachably connected by threads. The upper insertion rod 22 and the lower insertion rod 23 are both arranged parallel to the axial direction of the guide roller 20, and the upper insertion rod 22 and the lower insertion rod 23 are used to connect a section of the curing film 2 that is wound.

[0053] In order to facilitate the operation process of the present invention, the present invention further comprises an operating rod 24 . The operating rod 24 is a telescopic rod structure, and one end of the operating rod 24 is hinged to the outer side wall of the winding drum 1 away from the opening.

[0054] The drive motor 17 of the present invention is connected in series with a power supply (not shown in the figure) and a control switch (not shown in the figure). The power supply is a battery. The power supply and the control switch can be installed in the operating rod. The opening and closing process of the drive motor 17 can be realized by opening and closing the control switch.

[0055] The working principle of this utility model:

[0056] In the first step, the driving motor 17 is controlled to start, so that the sliding block 7 slides into the receiving rail 5;

[0057] Next, remove the upper and lower rods 22 and 23 from the winding drum 1, place the curing film 2 inside the winding drum 1, and install the upper and lower rods 22 and 23 on the winding drum 1, ensuring they pass through the core of the curing film 2 and secure with threaded connections. Pass the remaining section of the curing film 2 through the gap between the two guide rollers 20, ensuring that the curing film 2 does not wrinkle.

[0058] The third step is to wrap the other end of the curing membrane 2 around the bottom of the concrete column and wrap it around once.

[0059] In the fourth step, the staff then holds the operating lever 24 to make the guide roller 20 away from the winding drum 1 stick to the surface of the concrete column, and rotates around the concrete column to achieve the curing film 2 to cover the concrete column in an upward spiral, thereby completing the wrapping process of the concrete column.

[0060] In the fifth step, when one end of the curing film 2 is wrapped around the top of the concrete column, the driving motor 17 is started and the sliding block 7 slides along the cutting rail 4, thereby achieving the effect of cutting the other section of the curing film 2 from one end to the other.

[0061] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0062] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A concrete curing device for construction, characterized in that: include: A winding drum (1) is provided with an opening on its side wall, which is used to hold a section of the wound curing film (2), and another section of the curing film (2) passes through the opening; A guide roller assembly located at the opening, used for guiding when another section of the curing film (2) is laid; and A cutting component comprises a slide rail, a cutting blade (3) sliding along the slide rail track, and a driving assembly for driving the cutting blade (3) to slide along the slide rail track, wherein the slide rail comprises at least one section of a cutting rail (4) arranged along the length direction of the guide roller assembly, and when the cutting blade (3) slides along the cutting rail (4) track, it can cut another section of the curing film (2) from one end to the other.

2. The construction concrete curing device according to claim 1, characterized in that: The cutting component further comprises a plurality of connecting rods (6) fixedly connected to the outer side wall of the winding drum (1), and the slide rail further comprises a receiving rail (5) connected end to end with the cutting rail (4), the receiving rail (5) being located on a side of the cutting rail (4) away from the other section of the curing film (2), the receiving rail (5) and the cutting rail (4) being fixedly connected to the plurality of connecting rods (6), a sliding block (7) being slidably connected to the receiving rail (5) and the cutting rail (4), the sliding block (7) being connected to the cutting blade (3), and the driving assembly being used to drive the sliding block (7) to slide along the receiving rail (5) and the cutting rail (4).

3. The construction concrete curing device according to claim 2, characterized in that: The cutting component further comprises a telescopic plate (8), one end of the telescopic plate (8) is located in the surrounding area of the cutting rail (4) and the storage rail (5), and one end of the telescopic plate (8) is rotatably connected to the connecting rod (6), the other end of the telescopic plate (8) is rotatably connected to the sliding block (7), and the other end of the telescopic plate (8) is connected to the cutting blade (3), and the driving assembly is used to drive the other end of the telescopic plate (8) to rotate around one end of the telescopic plate (8).

4. The construction concrete curing device according to claim 3, characterized in that: The cutting component also includes: A first bevel gear (9) rotatably connected to one end of the telescopic plate (8), wherein the first bevel gear (9) is coaxially fixedly connected to a first rotating shaft (10), and the first rotating shaft (10) is fixedly connected to a connecting rod (6); A second bevel gear (11) is rotatably connected to the other end of the telescopic plate (8), the second bevel gear (11) is coaxially fixedly connected to a second rotating shaft (12), the second rotating shaft (12) is fixedly connected to a mounting seat, the cutting blade (3) is mounted on the mounting seat, and the cutting blade (3) faces the other end of the curing film (2); and A telescopic transmission shaft (14) is rotatably connected to the telescopic plate (8), and the telescopic transmission shaft (14) extends along the length direction of the telescopic plate (8). The keys at both ends of the telescopic transmission shaft (14) are connected to a third bevel gear (15) and a fourth bevel gear (16) in a one-to-one correspondence. The first bevel gear (9) and the third bevel gear (15) are meshed for transmission, and the second bevel gear (11) and the fourth bevel gear (16) are meshed for transmission. The transmission ratio between the first bevel gear (9) and the third bevel gear (15) is equal to the transmission ratio between the second bevel gear (11) and the fourth bevel gear (16).

5. The construction concrete curing device according to claim 4, characterized in that: The drive assembly includes: A driven gear (19) is coaxially sleeved on the circumference of the first rotating shaft (10) and fixedly connected to the telescopic plate (8); and A driving motor (17) is fixedly connected to the connecting rod (6), and the driving motor (17) is transmission-connected to a driving gear (18), and the driving gear (18) is meshed with a driven gear (19).

6. The construction concrete curing device according to claim 5, characterized in that: A plurality of connection seats (13) are fixedly mounted on a side of the telescopic plate (8) away from the connection rod (6), the plurality of connection seats (13) are spaced apart along the length direction of the telescopic plate (8), and the plurality of connection seats (13) are rotationally connected to the telescopic transmission shaft (14).

7. The construction concrete curing device according to claim 5, characterized in that: The telescopic plate (8) comprises a plurality of telescopic plate monomers, and adjacent telescopic plate monomers are slidably connected to each other; The telescopic transmission shaft (14) comprises a plurality of transmission shaft units, and adjacent transmission shaft units are slidably plugged into each other.

8. The construction concrete curing device according to claim 2, characterized in that: The guide roller assembly comprises: Two parallel and spaced guide rollers (20), the guide rollers (20) being located at the opening, and the other section of the curing film (2) passing through between the two guide rollers (20) and being frictionally connected thereto; and Two support plates (21) are rotatably connected to the upper and lower ends of the guide roller (20) in a one-to-one correspondence, and the two support plates (21) are fixedly connected to the connecting rod (6).

9. The construction concrete curing device according to claim 8, characterized in that: The top plate and the bottom plate of the winding drum (1) are movably connected to each other by an upper insertion rod (22) and a lower insertion rod (23). The upper insertion rod (22) and the lower insertion rod (23) are detachably connected by threads. The upper insertion rod (22) and the lower insertion rod (23) are both arranged parallel to the axis direction of the guide roller (20). The upper insertion rod (22) and the lower insertion rod (23) are used to connect a section of the curing film (2) that is wound.

10. The construction concrete curing device according to any one of claims 1 to 9, characterized in that: It also comprises an operating rod (24), one end of which is hinged to the outer side wall of the winding drum (1) away from the opening.

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