A steel reinforcement cage hot-melt connection device and its connection method

Abstract

The present invention discloses a hot-melt connection device for a steel reinforcement cage, which includes a hot-melt seat, a rotating member located inside the hot-melt seat, and a driving device for driving the rotating member to rotate; it also includes a plurality of extending members evenly distributed in a ring on the outer wall of the rotating member, and a limiting member located at the outer diameter end of the extending member. The limiting member is provided with a sliding groove extending radially inward from the outer diameter end, and the longitudinal bars of the steel reinforcement cage can slide in the sliding groove in the radial direction; it also includes a hot-melt device located directly below the rotating member. The purpose of the present invention is to provide a hot-melt connection device for a steel reinforcement cage to solve the problems in the prior art that the steel reinforcement cage needs to be produced by welding, resulting in a complex positioning structure and high costs. The production idea of abandoning welding is realized, and the connection can be completed by hot-melt method, so as to reduce the complexity of the equipment and further reduce the production cost.

Description

Technical Field

[0001] The present invention relates to the field of steel cage for bored piles, and particularly to a hot melt connection device for steel cage for bored piles and a connection method thereof. Background Art

[0002] In bridge and culvert construction or certain building construction, a large number of steel cages for bored piles are required. The steel cage for bored piles is a component that restricts the pile body concrete so that it can withstand a certain axial tensile force. It includes several longitudinals distributed in a ring shape and stirrups connected to each longitudinal. For a long time, in the production process of the steel cage for bored piles, each longitudinal and each stirrup need to be spot welded, and there are extremely many welding points and a huge workload. In the prior art, in order to reduce labor consumption, a large number of automatic welding devices for the production of steel cages for bored piles have emerged. However, in order to accurately position the welding points, these devices all have extremely complex positioning structures, resulting in high equipment prices and high costs. Moreover, the prior art has never broken through the shackles of the technical idea of connecting the steel cage for bored piles by spot welding. Summary of the Invention

[0003] The purpose of the present invention is to provide a hot melt connection device for steel cage for bored piles, so as to solve the problems in the prior art that the steel cage for bored piles needs to be produced by welding, resulting in a complex positioning structure and high costs, and to achieve the purpose of abandoning the production idea of welding, adopting a hot melt method to complete the connection, reducing the complexity of the device, and thus reducing the production cost.

[0004] The present invention is realized by the following technical solutions:

[0005] A hot melt connection device for steel cage for bored piles includes a hot melt base, a rotating member located inside the hot melt base, and a driving device for driving the rotating member to rotate; it also includes a plurality of extending members evenly distributed in a ring on the outer wall of the rotating member, and a limiting member located at the outer diameter end of the extending member. The limiting member is provided with a chute extending radially inward from the outer diameter end, and the longitudinal of the steel cage for bored piles can slide in the chute along the radial direction; it also includes a hot melt device located directly below the rotating member.

[0006] In view of the problem that the steel cage needs to be produced by welding in the prior art, resulting in a complex positioning structure and high cost, the present invention first proposes a steel cage hot-melt connection device, the hot-melt seat of the device can be used for each longitudinal reinforcement to pass through, the rotating member inside can rotate around its own rotating axis, and the driving device is used to drive the rotating member to rotate, wherein the driving device can drive the rotating member by any driving method in the prior art, which will not be repeated here. A plurality of extension members are fixed on the outer wall of the rotating member, that is, the outer diameter end face of the rotating member, extending radially outward, and a limit member is provided at the outer diameter end of the extension member, and a slide groove is provided at the outer diameter end of the limit member so that the slide groove extends radially inward. The slide groove is used for the longitudinal reinforcement to pass through, and its length in the radial direction is greater than the outer diameter of the longitudinal reinforcement, so that the longitudinal reinforcement can slide in the radial direction in the slide groove; of course, the width of the slide groove should be greater than or equal to the outer diameter of the longitudinal reinforcement to ensure that the longitudinal reinforcement can slide freely in the radial direction therein. When a certain stopper rotates to the top, the longitudinal reinforcement inside it is located at the bottom of the chute at that time, that is, at the radially inward end, under the action of gravity, and a gap is formed between the longitudinal reinforcement and the end surface of the chute. When a certain stopper rotates to the bottom, the longitudinal reinforcement inside it is located at the bottom of the chute at that time, that is, at the radially outward end, and can contact the stirrups sleeved outside each stopper.

[0007] When the device is in operation, firstly, several longitudinal bars are passed through each slide groove along the axial direction, and stirrups are put on the outside of each longitudinal bar; the stirrups are moved to the outside of each limiter so that the stirrups are directly opposite to each slide groove, and at this time, the stirrups are supported by each limiter; then the driving device starts to drive the rotating part to rotate, driving each limiter to rotate synchronously; when a limiter rotates to the top, the longitudinal bar in the limiter slides to the inner diameter end of the slide groove under the action of gravity, and a gap is formed between the longitudinal bar and the stirrup, and a fastener is installed in the gap so that the fastener cooperates with the longitudinal bar; when the limiter equipped with the fastener When the part rotates to the bottom, the longitudinal reinforcement in the limit part slides to the outer diameter end of the slide groove under the action of gravity, and the fastener is clamped between the stirrup and the longitudinal reinforcement, and the fastener cooperates with the stirrup and the longitudinal reinforcement at the same time; the hot melt device is started to hot-melt the fastener, so that the fastener is consolidated with the longitudinal reinforcement and the stirrup at the same time after cooling; and so on, until the current stirrup and all longitudinal reinforcements are hot-melted and consolidated, the longitudinal reinforcements can be moved as a whole to make the current stirrup leave the area of ​​each limit part, and then the above operation is repeated for the next stirrup until the hot-melt connection of all stirrups and longitudinal reinforcements is completed.

[0008] It should be noted that the fasteners used in the present application should be made of materials that can be hot-melted, such as common plastics. The hot-melt process necessarily requires heating, and the melting temperature of common plastic materials is significantly lower than the melting temperature of steel bars, so the hot-melt process will not cause damage to the steel bar body. The hot-melt device in the present application can be implemented by any hot-melt device that can be implemented by those skilled in the art.

[0009] It can be seen that the present application completely abandons the long-term thinking in the prior art that the steel reinforcement cage can only be connected by welding. By using a dedicated device and the hot melting concept, the consolidation of longitudinal bars and stirrups can be achieved. Since the connection of the steel reinforcement cage is only temporary and it will be completely consolidated in the concrete after the concrete is poured, the hot melting connection method of the present application can fully meet the temporary connection requirements of the steel reinforcement cage in bridge and culvert or other building constructions, and has engineering feasibility. Moreover, since the hot melting process of the present application will not damage the steel bar body, it can overcome the defects of the traditional welding method that it is necessary to avoid damage to the steel bar body by the welding joint and to accurately position the spot welding position, thereby significantly reducing the complexity of the equipment and further significantly reducing the production and processing cost of the steel reinforcement cage.

[0010] The fasteners used when the device works can be of any shape that can match the longitudinal bars and stirrups at the same time, and are not limited herein.

[0011] Furthermore, a circular channel is opened on the hot melting seat, and the rotating member is located in the circular channel; the axis of the circular channel is horizontal, and the axis of the circular channel is collinear with the rotating shaft of the rotating member; the hot melting device is located at the bottom end of the inner wall of the circular channel. This solution provides a relatively stable space environment for the connection of the stirrups and longitudinal bars through the opening of the circular channel, and at the same time can provide a reasonable installation position for the hot melting device.

[0012] Furthermore, the extension member is a first telescopic device that can expand and contract in the radial direction; a second telescopic device for driving the hot melting device to lift is also included.

[0013] In this solution, the corresponding extension member is driven to expand and contract in the radial direction by the first telescopic device. Since several extension members are evenly distributed on the outer wall of the rotating member, synchronously expanding and contracting the first telescopic devices can ensure that the extension members are always concentric. In addition, the hot melting device is controlled to lift by the second telescopic device, which is convenient to lift it to a suitable height when it is needed to work.

[0014] Furthermore, two barrier sheets are also included, and the two barrier sheets are respectively located on the opposite sides of the hot melting device along the circumferential direction of the rotating member; a slot matching the outer diameter end of the limiting member is opened at the top end of the barrier sheet; a third telescopic device for driving the barrier sheet to lift is also included.

[0015] Although the energy power, emission direction, etc. of the hot melting device can be controlled to hot melt the specified fasteners, there is still a risk that the fasteners on both sides will be hot melted. To overcome this problem, this solution provides barrier sheets to block the energy emitted by the hot melting device for hot melting the corresponding fasteners, so as to reduce the risk that the remaining fasteners on both sides will be hot melted.

[0016] Among them, the type of barrier film needs to be adaptively set according to the corresponding hot melt device: if the hot melt device is a device that directly generates heat and heats up, the barrier film can use an insulating plate; if the hot melt device is a device that applies a magnetic field to make the fastener self-heating, the barrier film can use the existing magnetic field shielding technology.

[0017] Furthermore, the hot melt device is a heating device or a magnetic field generating device; there are two hot melt devices, which are respectively located on opposite sides of the limiting part along the axial direction of the rotating part; and also includes a hot air device located between the two hot melt devices, and the hot air device blows air upward.

[0018] When the hot melt device is a heating device, the corresponding fasteners are directly melted by the heat it emits; when the hot melt device is a magnetic field generating device, it is necessary to pre-embed a metal interlayer with good magnetic conductivity in the corresponding fastener in advance, so that the fastener and the magnetic field can produce relative movement during hot melting, and then realize self-heating of the fastener through the principle of electromagnetic induction.

[0019] A hot air device for upward blowing is arranged between the two hot melting devices. The hot air blown upward acts on the hot-melted fasteners, which not only preheats the fasteners, but also provides an upward blowing force to the molten fasteners to prevent them from falling down and being wasted. After the hot melting device stops working, the hot air device can also help the hot-melted fasteners to quickly solidify on the surface of the longitudinal reinforcement and stirrups.

[0020] Furthermore, it also includes a support seat, on which an arc-shaped slide groove is arranged, and the axis of the arc-shaped slide groove is colinear with the rotation axis of the rotating part; it also includes a connecting rod connected to the rotating part, and a plurality of support rods are evenly distributed in a ring at one end of the connecting rod away from the rotating part, and the outer diameter end of the support rod matches the arc-shaped slide groove.

[0021] In this solution, the rotating member is connected by a connecting rod, and the connecting rod is supported by a support rod and a corresponding support seat to ensure support for the rotating member to prevent it from falling. It should be understood by those skilled in the art that the gap between the support rods can be used for the longitudinal reinforcement to pass through. The winding of the stirrups can be completed in the area between the support seat and the hot melt seat.

[0022] The hot melt connection method based on the hot melt connection equipment of the steel cage includes:

[0023] S1. Pass a number of longitudinal bars through each slide groove along the axial direction, and wind stirrups around the outside of each longitudinal bar;

[0024] S2. Move the stirrups to the outside of each limiter so that the stirrups are directly opposite to each chute;

[0025] S3, the rotating part rotates to drive each limit part to rotate;

[0026] S4. When a certain limiting member rotates to the top, the longitudinal bars inside the limiting member slide to the inner diameter end of the chute under the action of gravity, a gap is formed between the longitudinal bars and the stirrups, and a fastener is inserted into this gap to make the fastener cooperate with the longitudinal bars.

[0027] S5. When the limiting member equipped with the fastener rotates to the bottom, the longitudinal bars inside the limiting member slide to the outer diameter end of the chute under the action of gravity, and the fastener is clamped between the stirrups and the longitudinal bars, and the fastener cooperates with the stirrups and the longitudinal bars at the same time; start the hot melting device to hot melt the fastener so that the fastener is solidified with the longitudinal bars and the stirrups at the same time after cooling.

[0028] S6. Repeat S4 - S5 until all the stirrups and longitudinal bars are hot melted and solidified.

[0029] It can be seen that the process flow of this method is simple and convenient, and it can automatically achieve positioning relying on the action of gravity, which has a significant effect on reducing the production cost of the steel reinforcement cage.

[0030] Furthermore, the fastener includes a first fastening portion matching the longitudinal bars and a second fastening portion matching the stirrups; the first fastening portion and the second fastening portion are integrally formed.

[0031] When this solution works, first at the top position, the first fastening portion is buckled with the longitudinal bars by manual or robotic arm operation. At this time, the second fastening portion faces the position of the stirrups above. As the limiting member rotates, due to the restriction of the chute wall, the first fastening portion can always face the direction of the stirrups. When the fastener rotates to the bottommost position, the longitudinal bars and the fastener fall simultaneously, which can make the second fastening portion automatically complete the buckling with the stirrups, thereby realizing the automatic assembly of the fastener.

[0032] Furthermore, the fastener is made of plastic; the hot melting device hot melts the fastener by heating; it is only required that the steel bars do not change any state at the hot melting temperature of this plastic, and common plastics can meet this requirement.

[0033] Furthermore, the fastener is made of plastic, and a metal clip is arranged inside the fastener; the hot melting device makes the metal clip heat up by applying a dynamic magnetic field to realize the hot melting of the fastener.

[0034] This solution uses the principle of electromagnetic induction. The hot melting device applies a strong magnetic field, and the metal clip heats up by itself, so that the fastener is automatically hot melted, which is beneficial to quickly carry out temporary consolidation connection on the longitudinal bars and stirrups on both sides.

[0035] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0036] 1. An equipment and a connection method for hot-melt connection of steel reinforcement cages of the present invention completely abandon the long-term idea in the prior art that the steel reinforcement cages can only be connected by welding. By using a special equipment and the hot-melt idea, the consolidation of longitudinal bars and stirrups can be achieved. Since the connection of the steel reinforcement cage is only temporary and it will be completely consolidated in the concrete after pouring the concrete, the hot-melt connection method of this application can fully meet the temporary connection requirements of the steel reinforcement cage in bridge and culvert or other building constructions, and has engineering feasibility.

[0037] 2. An equipment and a connection method for hot-melt connection of steel reinforcement cages of the present invention will not cause damage to the steel bar body, and can overcome the defects of the traditional welding method that it is necessary to avoid damage to the steel bar body by the welding head and to accurately position the spot welding position, thereby significantly reducing the complexity of the equipment and further significantly reducing the production and processing cost of the steel reinforcement cage.

[0038] 3. An equipment and a connection method for hot-melt connection of steel reinforcement cages of the present invention have a simple and convenient technological process and can automatically achieve the required positioning depending on the gravity action, which has a significant effect on reducing the production cost of the steel reinforcement cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0040] Figure 1 is a schematic structural diagram of a specific embodiment of the present invention;

[0041] Figure 2 is a front view of a hot-melt seat in a specific embodiment of the present invention;

[0042] Figure 3 is a front view of a barrier sheet in a specific embodiment of the present invention;

[0043] Figure 4 is a schematic working process diagram of a specific embodiment of the present invention;

[0044] Figure 5 is a connection schematic diagram of a fastener in a specific embodiment of the present invention;

[0045] Figure 6 is a structural schematic diagram of a fastener in a specific embodiment of the present invention;

[0046] Figure 7 is Figure 2 a partial enlarged view at A in

[0047] The reference signs in the drawings and the corresponding component names:

[0048] 1 - Hot melt seat, 2 - Circular channel, 3 - Rotating part, 4 - Extension part, 5 - Limiting part, 6 - Sliding groove, 7 - Hot melt device, 8 - Second telescopic device, 9 - Barrier sheet, 10 - Notch, 11 - Third telescopic device, 12 - Hot air device, 13 - Support seat, 14 - Arc-shaped sliding groove, 15 - Connecting rod, 16 - Support rod, 17 - First fastening part, 18 - Second fastening part, 19 - Metal clip, 20 - Turntable, 21 - Motor, 22 - Strong magnetic generating device, 23 - Longitudinal reinforcement, 24 - Stirrup Detailed implementation mode

[0049] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and drawings. The illustrative implementation modes and descriptions of the present invention are only used to explain the present invention and do not limit the present invention.

[0050] Embodiment 1:

[0051] As Figure 1 And Figure 2 shown, a hot melt connection device for a steel reinforcement cage includes a hot melt seat 1, a rotating part 3 located inside the hot melt seat 1, and a driving device for driving the rotating part 3 to rotate; it also includes a plurality of extension parts 4 evenly distributed annularly on the outer wall of the rotating part 3, and a limiting part 5 located at the outer diameter end of the extension part 4. The limiting part 5 is provided with a sliding groove 6 extending radially inwards from the outer diameter end, and the longitudinal reinforcement of the steel reinforcement cage can slide radially in the sliding groove 6; it also includes a hot melt device 7 located directly below the rotating part 3.

[0052] A circular channel 2 is opened on the hot melt seat 1, and the rotating part 3 is located inside the circular channel 2; the axis of the circular channel 2 is horizontal, and the axis of the circular channel 2 is collinear with the rotating shaft of the rotating part 3; the hot melt device 7 is located at the bottom end of the inner wall of the circular channel 2.

[0053] The extension part 4 is a first telescopic device that can expand and contract in the radial direction; it also includes a second telescopic device 8 for driving the hot melt device 7 to move up and down.

[0054] As Figure 2 And Figure 3 shown, it also includes two barrier sheets 9, which are respectively located on the opposite sides of the hot melt device 7 along the circumferential direction of the rotating part 3; a notch 10 matching the outer diameter end of the limiting part 5 is opened at the top of the barrier sheet 9; it also includes a third telescopic device 11 for driving the barrier sheet 9 to move up and down.

[0055] The hot melt device 7 in this embodiment is a heating device or a magnetic field generating device; there are two hot melt devices 7 in total, which are respectively located on the opposite sides of the limiting part 5 along the axial direction of the rotating part 3; it also includes a hot air device 12 located between the two hot melt devices 7, and the hot air device 12 blows air upwards.

[0056] In this embodiment, when each first telescopic device is contracted to the shortest, each limiting member 5 is spliced ​​into a ring structure.

[0057] In this embodiment, there are two second telescopic devices 8, which are located on both sides of the limit member 5 along the axial direction of the rotating member 3, so as to facilitate hot melting of the fasteners from both sides at the same time, and the second telescopic devices 8 are installed at the bottom end of the inner wall of the circular channel 2.

[0058] In this embodiment, the longitudinal reinforcement and the stirrups are connected by hot melt by the following method: Figure 4 As shown:

[0059] S1, passing a plurality of longitudinal bars through each slide groove 6 in the axial direction, and winding stirrups around each longitudinal bar;

[0060] S2, move the stirrups to the outside of each limiter 5 so that the stirrups are directly opposite to each chute 6;

[0061] S3, the rotating member 3 rotates to drive each limiting member 5 to rotate;

[0062] S4. When a certain stopper 5 rotates to the top, the longitudinal reinforcement in the stopper 5 slides to the inner diameter end of the slide groove 6 under the action of gravity, and a gap is formed between the longitudinal reinforcement and the stirrup. A fastener is installed in the gap to make the fastener cooperate with the longitudinal reinforcement;

[0063] S5. When the stopper 5 equipped with the fastener rotates to the bottom, the longitudinal reinforcement in the stopper 5 slides to the outer diameter end of the slide groove 6 under the action of gravity, and the fastener is clamped between the stirrup and the longitudinal reinforcement, and the fastener cooperates with the stirrup and the longitudinal reinforcement at the same time; the hot melt device 7 is started to hot melt the fastener, so that the fastener is consolidated with the longitudinal reinforcement and the stirrup after cooling;

[0064] S6. Repeat S4 to S5 until the stirrups and all longitudinal reinforcements are hot-melt consolidated.

[0065] Among them, when this embodiment is working, the two ends of the longitudinal reinforcement can be supported by any means, such as manpower or support of corresponding equipment, and the longitudinal reinforcement can slide in the direction of gravity. The sliding range of the two ends of the longitudinal reinforcement can be unrestricted and the positioning is completely provided by the slide groove 6. Limiting devices matching the size of the slide groove can also be set at both ends of the longitudinal reinforcement.

[0066] In a more preferred embodiment, the number of the stoppers is set to an even number, so that they are opposite to each other in the radial direction. For the two opposite stoppers, when one is at the top to install the fastener, the other has already installed the fastener and arrived at the bottom for hot melting, and the operations at the upper and lower ends can be carried out simultaneously, which can further improve the processing efficiency of the steel cage of the present application.

[0067] Embodiment 2:

[0068] A steel reinforcement cage hot-melt connection device. On the basis of Embodiment 1, the fastener is made of plastic. As Figure 5 shown in Figure 6 , the fastener includes a first fastening part 17 matching the longitudinal bars and a second fastening part 18 matching the stirrups; the first fastening part 17 and the second fastening part 18 are integrally formed.

[0069] Among them, both the first fastening part 17 and the second fastening part 18 are in the shape of a minor arc, and their axes are perpendicular to each other.

[0070] When the hot-melt device 7 is a heating device, the fastener is as Figure 5 shown. The hot-melt device 7 hot-melts the fastener by heating. At this time, the barrier sheet can be an insulating board.

[0071] When the hot-melt device 7 is a magnetic field generating device, the fastener is as Figure 6 shown. The hot-melt device 7 makes the metal clip 19 inside the fastener heat up by applying a dynamic magnetic field to achieve the hot-melting of the fastener. At this time, the barrier sheet can use a magnetic field shielding part or a magnetic isolation part.

[0072] Preferably, the metal clip 19 is made of a metal material with good magnetic conductivity.

[0073] Preferably, when the hot-melt device 7 is a magnetic field generating device, its specific structure is as Figure 7 shown, including a turntable 20 fixed on the top of the second telescopic device 8, a motor 21 for driving the turntable 20 to rotate, and a strong magnetic field generating device 22 arranged on the outer edge of the turntable 20.

[0074] Embodiment 3:

[0075] A steel reinforcement cage hot-melt connection device. On the basis of any of the above embodiments, as Figure 1 shown, it further includes a support seat 13. An arc-shaped chute 14 is arranged on the support seat 13, and the axis of the arc-shaped chute 14 is collinear with the rotating shaft of the rotating member 3; it further includes a connecting rod 15 connected to the rotating member 3. A plurality of support rods 16 are annularly and evenly distributed at one end of the connecting rod 15 away from the rotating member 3, and the outer diameter end of the support rod 16 matches the arc-shaped chute 14.

[0076] In this solution, part of the support rods 16 are supported by the arc-shaped chute 14, thereby providing support for the connecting rod 15 and the rotating member 3.

[0077] In a more preferred implementation manner, a bearing can also be arranged at the end of the connecting rod 15, and each support rod 16 is fixedly connected to the bearing, so that the end of the support rod 16 is fixed in the arc-shaped chute 14. In this solution, the connecting rod 15 rotates with the rotating member 3, and each support rod 16 is stationary relative to the support seat 13 to achieve the required support function.

[0078] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. In addition, the term "connected" as used in this text, without special explanation, can be directly connected or indirectly connected via other components.

[0079] The specific embodiments described above further elaborate on the purpose, technical solution and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hot-melt connection device for a steel reinforcement cage, characterized in that, it includes a hot-melt base (1), a rotating member (3) located inside the hot-melt base (1), and a driving device for driving the rotating member (3) to rotate; it also includes a plurality of extension members (4) evenly distributed in a ring on the outer wall of the rotating member (3), and a limiting member (5) located at the outer diameter end of the extension member (4). The limiting member (5) is provided with a chute (6) extending radially inward from the outer diameter end, and the longitudinal bars of the steel reinforcement cage can slide in the chute (6) in the radial direction; it also includes a hot-melt device (7) located directly below the rotating member (3); it also includes a fastener, and the fastener includes a first fastening portion (17) matching the longitudinal bar and a second fastening portion (18) matching the stirrup; the first fastening portion (17) and the second fastening portion (18) are integrally formed; the fastener is made of plastic.

2. The hot-melt connection device for a steel reinforcement cage according to claim 1, characterized in that, a circular channel (2) is opened on the hot-melt base (1), and the rotating member (3) is located inside the circular channel (2); the axis of the circular channel (2) is horizontal, and the axis of the circular channel (2) is collinear with the rotating shaft of the rotating member (3); the hot-melt device (7) is located at the bottom end of the inner wall of the circular channel (2).

3. The hot-melt connection device for a steel reinforcement cage according to claim 1, characterized in that, the extension member (4) is a first telescopic device capable of telescoping in the radial direction; it also includes a second telescopic device (8) for driving the hot-melt device (7) to lift.

4. The hot-melt connection device for a steel reinforcement cage according to claim 1, characterized in that, it also includes two barrier sheets (9), and the two barrier sheets (9) are respectively located on the opposite sides of the hot-melt device (7) along the circumferential direction of the rotating member (3); a notch (10) matching the outer diameter end of the limiting member (5) is opened at the top end of the barrier sheet (9); it also includes a third telescopic device (11) for driving the barrier sheet (9) to lift.

5. The hot-melt connection device for a steel reinforcement cage according to claim 1, characterized in that, the hot-melt device (7) is a heating device or a magnetic field generating device; there are two hot-melt devices (7) in total, which are respectively located on the opposite sides of the limiting member (5) along the axial direction of the rotating member (3); it also includes a hot air device (12) located between the two hot-melt devices (7), and the hot air device (12) blows air upward.

6. The hot-melt connection device for a steel reinforcement cage according to claim 1, characterized in that, it also includes a support base (13), an arc-shaped chute (14) is provided on the support base (13), and the axis of the arc-shaped chute (14) is collinear with the rotating shaft of the rotating member (3); it also includes a connecting rod (15) connected to the rotating member (3), and a plurality of support rods (16) are evenly distributed in a ring at the end of the connecting rod (15) far from the rotating member (3), and the outer diameter end of the support rod (16) matches the arc-shaped chute (14).

7. A hot-melt connection method for the hot-melt connection device for a steel reinforcement cage according to any one of claims 1 to 6, characterized in that, it includes: S1. Pass several longitudinal bars axially through each chute (6), and wind stirrups around the outer sides of the longitudinal bars; S2. Move the stirrups outside each limiting member (5) so that the stirrups are aligned with each chute (6); S3. The rotating member (3) rotates to drive each limiting member (5) to rotate; S4. When a certain limiting member (5) rotates to the top, the longitudinal bar inside the limiting member (5) slides to the inner diameter end of the chute (6) under the action of gravity, a gap is formed between the longitudinal bar and the stirrup, and a fastener is installed in the gap to make the fastener cooperate with the longitudinal bar; S5. When the limiting member (5) with the installed fastener rotates to the bottom, the longitudinal bar inside the limiting member (5) slides to the outer diameter end of the chute (6) under the action of gravity, and the fastener is clamped between the stirrup and the longitudinal bar, and the fastener cooperates with the stirrup and the longitudinal bar at the same time; Start the hot melting device (7) to hot melt the fastener so that the fastener is solidified with the longitudinal bar and the stirrup at the same time after cooling; S6. Repeat S4 - S5 until the stirrups and all longitudinal bars are completely hot melt solidified.

8. The hot melt connection method according to claim 7, characterized in that, the hot melting device (7) hot melts the fastener by heating.

9. The hot melt connection method according to claim 7, characterized in that, a metal clip (19) is arranged inside the fastener; the hot melting device (7) makes the metal clip (19) generate heat by applying a dynamic magnetic field to realize the hot melting of the fastener.

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