Safe hoisting device for building construction

Abstract

The invention relates to the technical field of building construction, in particular to a building construction safety hoisting device which comprises a hoisting frame, a fixing opening is formed in the inner wall of the bottom of the hoisting frame, a main core plate is fixedly arranged in the fixing opening, stand columns distributed at equal intervals are fixedly arranged on the upper surface of the main core plate, and a hoisting plate is fixedly arranged at the top ends of the stand columns; a lifting ring is fixedly arranged on the upper surface of the lifting plate, a supporting plate is fixedly arranged on the lower surface of the main core plate, a fixing rod is fixedly arranged on the lower surface of the supporting plate, and a clamping plate is fixedly arranged at the bottom end of the fixing rod. The hoisting device is more efficient and faster in the building material placing process, the two ends of the hoisting frame are blocked through the side blocking mechanisms, the safety in the hoisting process can be effectively improved, further, the hoisting devices can be combined for use, more building materials can be hoisted at a time, the hoisting efficiency is effectively improved, and the using effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a safe lifting device for building construction. Background Art

[0002] In the field of construction, efficient and safe lifting of building materials and equipment is one of the key links to ensure the smooth progress of the project. With the rapid development of the construction industry, building structures are becoming increasingly complex and construction heights are constantly increasing, which puts higher requirements on the performance and safety of lifting devices.

[0003] At present, the existing construction lifting devices have many shortcomings in practical applications. Especially when lifting long strips of building materials such as pipes and steel bars, the lifting methods of traditional lifting devices are often simple and crude, lacking optimized designs for the characteristics of long strips of building materials. For example, the common hook or rope bundling method can easily cause the long strips of building materials to slide, roll or even fall off during the lifting process, which may not only damage the long strips of building materials, but also pose a serious safety threat to personnel and equipment on the construction site. At the same time, the bundling type lifting is not only cumbersome to operate but also has a very limited lifting capacity. Therefore, it is urgent to design a safe lifting device for construction to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the defects in the prior art and to propose a safe lifting device for construction.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A construction safety lifting device comprises a lifting frame, a fixing opening is provided on the bottom inner wall of the lifting frame, and a main core plate is fixedly arranged in the fixing opening, columns distributed at equal distances are fixedly arranged on the upper surface of the main core plate, and a hanging plate is fixedly arranged on the top of the column, a hanging ring is fixedly arranged on the upper surface of the hanging plate, a supporting plate is fixedly arranged on the lower surface of the main core plate, a fixing rod is fixedly arranged on the lower surface of the supporting plate, and a clamping plate is fixedly arranged at the bottom end of the fixing rod, and the side wall of the clamping plate is provided with clamping grooves at equal distances and corresponding to the columns, and further comprises: A limiting mechanism, which is arranged outside the main core plate and is used to limit the building materials to be hoisted in the hoisting frame; A side blocking mechanism, which is arranged on the outer wall of the lifting frame and is used to block both ends of the lifting frame; The supporting mechanism is arranged on the supporting plate and is used for supporting the lifting frame in the lower lifting device when the lifting devices are stacked and used in combination.

[0006] As a further solution of the present invention: the limiting mechanism includes a rotating hole opened in the main core plate, and a rotating shaft is rotatably arranged in the rotating hole, a limiting plate is fixedly arranged at the end of the rotating shaft, a locking assembly is arranged in the limiting plate for limiting the position of the limiting plate in the lifting frame, and a tightening assembly is also arranged in the limiting plate.

[0007] As a further solution of the present invention: the locking assembly includes a plug plate, the outer wall of the limit plate is provided with an installation opening, and the inner wall on one side of the installation opening is provided with a movable groove, and the plug plate is movably arranged in the movable groove, the inner wall on the other side of the installation opening is provided with a movable opening, and the plug plate passes through the movable opening, side plates are fixedly arranged on the outer walls of both sides of the plug plate, a limit rod is fixedly arranged on the inner wall of the installation opening, and the limit rod passes through the side plates, a first spring is sleeved on the outer side of the limit rod, and the first spring is located on the side of the side plate close to the rotating shaft, the inner wall of the lifting frame is provided with slots distributed at equal distances, and the end of the plug plate cooperates with the slots, and a paddle is also fixedly arranged on the upper surface of the plug plate, and the paddle is located in the installation opening.

[0008] As a further solution of the present invention: the tightening component includes a threaded opening opened on the outer wall of the limit plate, and a stud is threadedly connected in the threaded opening, a turntable is fixedly provided on the top of the stud, and a grip rod is fixedly provided on the upper surface of the turntable, and a stop block is fixedly provided on the bottom end of the stud, and the stop block is semi-spherical.

[0009] As a further solution of the present invention: the side baffle mechanism includes a fixing bar fixedly arranged on the outer walls on both sides of the lifting frame, a through hole is opened in the fixing bar, and a telescopic rod is inserted in the through hole, a baffle is fixedly arranged on the end of the telescopic rod, and a fixing component is arranged on the outer wall of the fixing bar for limiting the position of the telescopic rod.

[0010] As a further solution of the present invention: the fixing assembly includes a grip plate, a restraining rod is fixedly provided on the outer wall of the grip plate, a fixing frame is fixedly provided on the outer wall of the fixing bar, and the restraining rod passes through the fixing frame, a baffle is fixedly provided on the outer wall of the restraining rod, and the baffle is located in the fixing frame, the grip plate and the fixing bar are connected by a second spring, the outer wall of the telescopic rod is provided with restraining grooves which are equidistantly distributed and matched with the restraining rod, and when the restraining rod is inserted into the restraining groove, the baffle remains in a state of blocking the end of the lifting frame.

[0011] As a further solution of the present invention: a support block is fixedly provided on the upper surface of the support plate, and the support block is fixedly connected to the outer wall of the lifting frame.

[0012] As a further solution of the present invention: the supporting mechanism includes a screw, the outer wall of the support plate is provided with a threaded hole, and the screw is threadedly connected in the threaded hole, the bottom end of the screw is fixedly provided with a supporting plate, and the outer wall of the screw is fixedly provided with rotating rods distributed in a ring at equal distances.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The invention provides a safe lifting device for construction work. When it is necessary to lift long strips of building materials such as pipes and steel bars, the limiting mechanism can be opened first, and then the building materials can be directly placed in the lifting frame through the top of the lifting frame. The placing process is more convenient and quick. Then the building materials can be restrained in the lifting frame through the limiting mechanism. The hook of the crane can be connected to the lifting ring to facilitate the crane to lift the lifting frame. During the lifting process, the two ends of the lifting frame can also be blocked by the side blocking mechanism, which further improves the safety during the lifting process. When a large number of building materials need to be lifted at one time and multiple sets of lifting devices are required and the construction site meets the lifting needs, the lifting frames can be The devices are used in combination. When combining, one group of lifting devices is lifted first, and then the lifting devices to be combined are moved to the bottom of the lifted lifting devices, and the columns in the lower lifting devices are stuck in the clamping plates in the upper lifting devices. At the same time, the top of the lifting frame in the lower lifting device is supported by the supporting mechanism in the upper lifting device, so that the hanging plate in the lower lifting device is tightly fitted with the clamping plate in the upper lifting device, so that the two groups of lifting devices can be locked. The above-mentioned connection method can realize the combined use of multiple groups of lifting devices, which can be flexibly assembled according to the needs of use, effectively improving the lifting efficiency and achieving better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a safety lifting device for construction provided by an embodiment of the present invention from a first perspective; Figure 2 A schematic diagram of the structure of a lifting frame in a construction safety lifting device provided by an embodiment of the present invention from a first perspective; Figure 3 A schematic structural diagram of a lifting frame in a construction safety lifting device provided by an embodiment of the present invention from a second viewing angle; Figure 4 A schematic diagram of the structure of a limit plate in a construction safety lifting device provided by an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a construction safety lifting device provided by an embodiment of the present invention from a second viewing angle; Figure 6 A schematic diagram of the structure of a fixing component in a construction safety lifting device provided by an embodiment of the present invention; Figure 7A schematic diagram of a half-section structure of a fixing bar in a construction safety lifting device provided by an embodiment of the present invention; Figure 8 A third-perspective structural schematic diagram of a construction safety lifting device provided in an embodiment of the present invention.

[0015] In the figure: 101-lifting frame, 102-main core plate, 103-support plate, 104-column, 105-hanging plate, 106-lifting ring, 107-fixing rod, 108-card plate, 109-card slot, 110-support block, 201-rotating shaft, 202-limiting plate, 203-rotating hole, 204-limiting rod, 205-side plate, 206-first spring, 207-plug plate, 208-dial Plate, 209-slot, 210-installation port, 301-turntable, 302-stud, 303-block, 304-grip, 401-fixing bar, 402-telescopic rod, 403-baffle, 501-fixing frame, 502-binding rod, 503-baffle, 504-grip, 505-second spring, 506-binding slot, 601-screw, 602-baffle, 603-turning rod. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1-Figure 8 As shown, a construction safety lifting device provided by an embodiment of the present invention comprises a lifting frame 101, a fixing opening is provided on the bottom inner wall of the lifting frame 101, and a main core plate 102 is fixedly arranged in the fixing opening, columns 104 distributed at equal distances are fixedly arranged on the upper surface of the main core plate 102, and a hanging plate 105 is fixedly arranged on the top of the column 104, a hanging ring 106 is fixedly arranged on the upper surface of the hanging plate 105, a supporting plate 103 is fixedly arranged on the lower surface of the main core plate 102, and a fixing rod 107 is fixedly arranged on the lower surface of the supporting plate 103 , and a clamping plate 108 is fixedly provided at the bottom end of the fixing rod 107, and a clamping groove 109 is opened on the side wall of the clamping plate 108 at an equal distance and corresponding to the column 104, and also includes: a limiting mechanism, the limiting mechanism is arranged on the outside of the main core plate 102, and is used to limit the building materials to be lifted in the lifting frame 101; a side blocking mechanism, the side blocking mechanism is arranged on the outer wall of the lifting frame 101, and is used to block the two ends of the lifting frame 101; a supporting mechanism, the supporting mechanism is arranged on the support plate 103, and is used to support the lifting frame 101 in the lower lifting device when the lifting devices are stacked and used in combination.

[0018] When it is necessary to lift long strips of building materials such as pipes and steel bars, the limiting mechanism can be opened first, and then the building materials can be directly placed in the lifting frame 101 through the top of the lifting frame 101. The placement process is more convenient and quick, and then the building materials can be restrained in the lifting frame 101 through the limiting mechanism. The hook of the crane can be connected to the lifting ring 106, which is convenient for the crane to lift the lifting frame 101. During the lifting process, the two ends of the lifting frame 101 can also be blocked by the side blocking mechanism, which further improves the safety during the lifting process. When a large number of building materials need to be lifted at one time and multiple sets of lifting devices need to be lifted and the construction site meets the lifting needs, the lifting devices can be used in combination. When assembling, first lift one set of lifting devices, then move the lifting devices to be assembled to the bottom of the lifted lifting devices, and make the column 104 in the lower lifting device stuck in the card plate 108 in the upper lifting device, and at the same time, use the supporting mechanism in the upper lifting device to support the top of the lifting frame 101 in the lower lifting device, so that the hanging plate 105 in the lower lifting device is tightly fitted with the card plate 108 in the upper lifting device, so that the locking between the two sets of lifting devices can be achieved. The above-mentioned connection method can realize the combined use of multiple sets of lifting devices, which can be flexibly assembled according to the needs of use, effectively improving the lifting efficiency and achieving better use effect.

[0019] As an embodiment of the present invention, please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 The limiting mechanism includes a rotating hole 203 opened in the main core plate 102, and a rotating shaft 201 is rotatably arranged in the rotating hole 203, and a limiting plate 202 is fixedly arranged at the end of the rotating shaft 201, and a clamping component is arranged in the limiting plate 202, which is used to limit the position of the limiting plate 202 in the lifting frame 101. The limiting plate 202 is also provided with a tightening component. When the building materials to be lifted are placed in the lifting frame 101, the limiting plate 202 can be rotated to make the limiting plate 202 fit with the building materials, and then the position of the limiting plate 202 is limited by the clamping component. After limitation, the gap between the building materials can be reduced by the tightening component, making the building materials tighter, further improving the lifting safety and achieving better use effect.

[0020] As an embodiment of the present invention, please refer to Figure 2 , Figure 4 and Figure 5The positioning assembly includes an insert plate 207, an outer wall of the limiting plate 202 is provided with an installation opening 210, and an inner wall on one side of the installation opening 210 is provided with a movable groove, and the insert plate 207 is movably arranged in the movable groove, and an inner wall on the other side of the installation opening 210 is provided with a movable opening, and the insert plate 207 passes through the movable opening, and side plates 205 are fixedly arranged on the outer walls of both sides of the insert plate 207, and a limiting rod 204 is fixedly arranged on the inner wall of the installation opening 210, and the limiting rod 204 passes through the side plate 205, and the outer side of the limiting rod 204 is sleeved with a first spring 206, and the first spring 206 is located on the side of the side plate 205 close to the rotating shaft 201, and the inner wall of the lifting frame 101 is provided with a movable opening. There are slots 209 distributed at equal distances, and the ends of the plug plate 207 match the slots 209. A paddle 208 is also fixedly provided on the upper surface of the plug plate 207, and the paddle 208 is located in the installation port 210. When the limit plate 202 needs to be moved, the paddle 208 can be first paddled to move the plug plate 207 out of the slot 209. At this time, the first spring 206 is in a compressed state. When the limit plate 202 moves to a suitable position, the paddle 208 can be released. At this time, under the resetting action of the first spring 206, the plug plate 207 can be re-stuck in the slot 209 to limit the position of the limit plate 202, which is very convenient to use.

[0021] As an embodiment of the present invention, please refer to Figure 3 and Figure 4 The tightening component includes a threaded opening opened on the outer wall of the limiting plate 202, and a stud 302 is threadedly connected in the threaded opening, a turntable 301 is fixedly provided on the top of the stud 302, and a grip 304 is fixedly provided on the upper surface of the turntable 301, and a stop block 303 is fixedly provided on the bottom end of the stud 302, and the stop block 303 is semi-spherical. When the position of the limiting plate 202 is fixed, the grip 304 can be held with the turntable 301, and the turntable 301 drives the stud 302 to rotate, so that the stud 302 and the stop block 303 at the end of the stud 302 move downward together, which plays a role in squeezing the building materials, making the building materials tighter and less likely to loosen, and having a better use effect.

[0022] As an embodiment of the present invention, please refer to Figure 1 , Figure 2 , Figure 6 and Figure 7The side blocking mechanism includes a fixing bar 401 fixedly arranged on the outer walls of both sides of the lifting frame 101, a through hole is opened in the fixing bar 401, and a telescopic rod 402 is inserted in the through hole, and a baffle 403 is fixedly arranged at the end of the telescopic rod 402. A fixing component is arranged on the outer wall of the fixing bar 401 to limit the position of the telescopic rod 402. When placing building materials in the lifting frame 101, the limit of the telescopic rod 402 by the fixing component can be released first. When the building materials are placed in the lifting frame 101, the building materials will automatically press down the baffle 403 , so that the telescopic rod 402 rotates to avoid obstruction in the placement process of the building materials. When the building materials are placed, the telescopic rod 402 can be partially pulled out from the through hole of the fixing bar 401, and the telescopic rod 402 can be rotated to move the baffle 403 to the end of the building material. The telescopic rod 402 can then be fixed by the fixing assembly, which can play the role of side blocking for both ends of the building materials, effectively preventing the building materials from loosening and directly slipping off the lifting frame 101, further improving the safety during the lifting process and achieving better use effect.

[0023] As an embodiment of the present invention, please refer to Figure 6 and Figure 7 The fixing assembly includes a grip plate 504, an outer wall of which is fixedly provided with a tie rod 502, an outer wall of the fixing bar 401 is fixedly provided with a fixing frame 501, and the tie rod 502 passes through the fixing frame 501, and an outer wall of the tie rod 502 is fixedly provided with a baffle 503, and the baffle 503 is located in the fixing frame 501 to prevent the tie rod 502 from being completely moved out of the fixing frame 501, the grip plate 504 and the fixing bar 401 are connected by a second spring 505, and the outer wall of the telescopic rod 402 is provided with tie grooves 506 that are equidistantly distributed and matched with the tie rod 502, and when the tie rod 502 is inserted into the tie groove 506, the baffle 403 keeps the end of the lifting frame 101 blocked, and the tie rod 502 can be pulled out of the tie groove 506 of the telescopic rod 402 by holding and pulling the grip plate 504, which can quickly The limit on the telescopic rod 402 is quickly released, and when the baffle plate 403 rotates, the telescopic rod 402 rotates therewith. At this time, the restraining groove 506 and the restraining rod 502 are misaligned, and the restraining rod 502 can no longer be inserted into the restraining groove 506 to limit the telescopic rod 402. At this time, the second spring 505 is in a stretched state. When it is necessary to block the two ends of the building material, the baffle plate 403 can be moved to the position of the end of the building material first, and then the baffle plate 403 is rotated to keep it horizontal, and the telescopic rod 402 is slightly moved until the restraining rod 502 and the restraining groove 506 are aligned. At this time, under the resetting action of the second spring 505, the restraining rod 502 can be automatically inserted into the restraining groove 506, which plays a role in limiting the position of the telescopic rod 402, and then plays the purpose of quickly limiting the position of the baffle plate 403, which is very convenient to use.

[0024] As an embodiment of the present invention, please refer to Figure 1 and Figure 3 A support block 110 is also fixedly provided on the upper surface of the support plate 103, and the support block 110 is fixedly connected to the outer wall of the lifting frame 101. The support block 110 can connect the support plate 103 and the lifting frame 101, which can effectively improve the connection stability between the main core plate 102 and the lifting frame 101, and the use effect is better.

[0025] As an embodiment of the present invention, please refer to Figure 1 , Figure 5 and Figure 8 The supporting mechanism includes a screw 601, a threaded hole is provided on the outer wall of the support plate 103, and the screw 601 is threadedly connected to the threaded hole, a supporting plate 602 is fixedly provided at the bottom end of the screw 601, and rotating rods 603 distributed in a ring at equal distances are fixedly provided on the outer wall of the screw 601. When the lifting device is used in combination, the screw 601 can be driven to rotate by rotating the rotating rod 603, so that the supporting plate 602 moves downward to support the lifting frame 101 in the lifting device below, so that the upper and lower lifting devices can be kept relatively stable, and the use effect is better.

[0026] When in use, when it is necessary to lift long strips of building materials such as pipes and steel bars, the limiting mechanism can be opened first, and then the building materials can be directly placed in the lifting frame 101 through the top of the lifting frame 101. The placement process is more convenient and quick, and then the building materials can be restrained in the lifting frame 101 through the limiting mechanism. The hook of the crane can be connected to the lifting ring 106, which is convenient for the crane to lift the lifting frame 101. During the lifting process, the two ends of the lifting frame 101 can also be blocked by the side blocking mechanism, which further improves the safety during the lifting process. When a large number of building materials need to be lifted at one time and multiple sets of lifting devices need to be lifted and the construction site meets the lifting needs, the lifting devices can be combined. When using and assembling, first lift one set of lifting devices, then move the lifting devices to be combined to the bottom of the lifted lifting devices, and make the column 104 in the lower lifting device stuck in the clamping plate 108 in the upper lifting device, and at the same time, use the supporting mechanism in the upper lifting device to support the top of the lifting frame 101 in the lower lifting device, so that the hanging plate 105 in the lower lifting device is tightly fitted with the clamping plate 108 in the upper lifting device, so that the locking between the two sets of lifting devices can be achieved. The above-mentioned connection method can realize the combined use of multiple sets of lifting devices, and can be flexibly assembled according to the needs of use, which effectively improves the lifting efficiency and achieves better use effect.

[0027] It should be particularly noted that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A construction safety lifting device, comprising a lifting frame, characterized in that: The bottom inner wall of the lifting frame is provided with a fixing opening, and a main core plate is fixedly arranged in the fixing opening, columns distributed at equal distances are fixedly arranged on the upper surface of the main core plate, and a hanging plate is fixedly arranged on the top of the column, and a hanging ring is fixedly arranged on the upper surface of the hanging plate, a supporting plate is fixedly arranged on the lower surface of the main core plate, a fixing rod is fixedly arranged on the lower surface of the supporting plate, and a card plate is fixedly arranged at the bottom end of the fixing rod, and the side wall of the card plate is provided with card slots at equal distances and corresponding to the columns, and further includes: A limiting mechanism, which is arranged outside the main core plate and is used to limit the building materials to be hoisted in the hoisting frame; A side blocking mechanism, which is arranged on the outer wall of the lifting frame and is used to block both ends of the lifting frame; The supporting mechanism is arranged on the supporting plate and is used for supporting the lifting frame in the lower lifting device when the lifting devices are stacked and used in combination.

2. A construction safety lifting device according to claim 1, characterized in that: The limiting mechanism includes a rotating hole opened in the main core plate, and a rotating shaft is rotatably arranged in the rotating hole, a limiting plate is fixedly arranged at the end of the rotating shaft, a locking assembly is arranged in the limiting plate for limiting the position of the limiting plate in the lifting frame, and a tightening assembly is also arranged in the limiting plate.

3. A construction safety lifting device according to claim 2, characterized in that: The positioning assembly includes a plug plate, an outer wall of the limit plate is provided with a mounting opening, and an inner wall on one side of the mounting opening is provided with a movable groove, and the plug plate is movably arranged in the movable groove, an inner wall on the other side of the mounting opening is provided with a movable opening, and the plug plate passes through the movable opening, side plates are fixedly provided on the outer walls of both sides of the plug plate, a limit rod is fixedly provided on the inner wall of the mounting opening, and the limit rod passes through the side plate, a first spring is sleeved on the outer side of the limit rod, and the first spring is located on a side of the side plate close to the rotating shaft, the inner wall of the lifting frame is provided with slots distributed at equal distances, and the end of the plug plate cooperates with the slots, a paddle is also fixedly provided on the upper surface of the plug plate, and the paddle is located in the mounting opening.

4. A construction safety lifting device according to claim 3, characterized in that: The tightening component includes a threaded opening opened on the outer wall of the limiting plate, and a stud is threadedly connected in the threaded opening, a turntable is fixedly provided on the top of the stud, and a grip rod is fixedly provided on the upper surface of the turntable, and a stop block is fixedly provided on the bottom end of the stud, and the stop block is semi-spherical.

5. A construction safety lifting device according to claim 1, characterized in that: The side baffle mechanism includes a fixing bar fixedly arranged on the outer walls on both sides of the lifting frame, a through hole is opened in the fixing bar, and a telescopic rod is inserted in the through hole, a baffle is fixedly arranged on the end of the telescopic rod, and a fixing component is arranged on the outer wall of the fixing bar for limiting the position of the telescopic rod.

6. A construction safety lifting device according to claim 5, characterized in that: The fixing assembly includes a grip plate, a restraining rod is fixedly provided on the outer wall of the grip plate, a fixing frame is fixedly provided on the outer wall of the fixing bar, and the restraining rod passes through the fixing frame, a baffle is fixedly provided on the outer wall of the restraining rod, and the baffle is located in the fixing frame, the grip plate and the fixing bar are connected by a second spring, and restraining grooves which are equidistantly distributed and matched with the restraining rod are opened on the outer wall of the telescopic rod, and when the restraining rod is inserted into the restraining groove, the baffle keeps the end of the lifting frame blocked.

7. A construction safety lifting device according to claim 1, characterized in that: A support block is also fixedly arranged on the upper surface of the support plate, and the support block is fixedly connected to the outer wall of the lifting frame.

8. A construction safety lifting device according to claim 1, characterized in that: The supporting mechanism comprises a screw rod, a threaded hole is formed on the outer wall of the support plate, and the screw rod is threadedly connected in the threaded hole, a supporting plate is fixedly arranged at the bottom end of the screw rod, and rotating rods which are equidistantly distributed in a ring shape are fixedly arranged on the outer wall of the screw rod.

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