Concrete pipeline winding and unwinding device, cantilever structure and 3D printing equipment

Abstract

The invention relates to the technical field of concrete 3D printing, and particularly discloses a concrete pipeline winding and unwinding device, a cantilever structure and 3D printing equipment, the concrete pipeline winding and unwinding device is applied to the cantilever structure of the concrete 3D printing equipment, and the cantilever structure comprises a fixed beam and a telescopic beam; the concrete pipeline winding and unwinding device comprises a mounting frame, a pipe winding piece and a conveying pipe, the mounting frame is mounted on the fixed beam, the pipe winding piece is slidably mounted on the mounting frame, a pipe winding groove is formed in the outer side of the pipe winding piece in the circumferential direction, the conveying pipe is wound in the pipe winding groove, and one end of the conveying pipe extends in the extending direction of the telescopic beam and is fixedly mounted on the 3D printing head. And the other end is connected with pumping equipment. When the concrete 3D printing equipment drives the conveying pipe to horizontally move through movement of the telescopic beam, the conveying pipe slides relative to the mounting frame through the pipe winding piece, and stable movement of the conveying pipe is achieved. According to the scheme, resistance generated by irregular movement of the conveying pipe is reduced, and then the structural stability of the cantilever structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete 3D printing, and in particular to a concrete pipe retracting and releasing device, a cantilever structure and 3D printing equipment. Background Art

[0002] Existing concrete 3D printing equipment used on construction sites generally includes a cantilever structure, a supporting structure, a concrete delivery pipeline and a 3D printing head. The concrete delivery pipeline is usually directly hung between the fixed beam of the cantilever structure of the concrete 3D printing equipment and the printing head using a tank chain or other connecting structure. The above installation method will cause the turning radius of the concrete delivery pipeline to be larger, and the downward pulling force generated when conveying concrete will be larger, which will increase the load on the cantilever structure and affect the stability of the cantilever structure. Summary of the invention

[0003] The main purpose of the present invention is to propose a concrete pipe retracting and releasing device, a cantilever structure and a 3D printing device, aiming to solve the problem that the concrete conveying pipe of the existing concrete 3D printing equipment is directly hung between the fixed beam of the cantilever structure and the 3D printing head, resulting in poor stability of the cantilever structure.

[0004] In order to solve the above problems, the present invention provides a concrete pipe retracting and releasing device, comprising:

[0005] a mounting frame, the mounting frame being mounted on the fixed beam;

[0006] A pipe winding member, the pipe winding member is slidably mounted on the mounting frame, and a pipe winding groove is circumferentially provided on the outer side of the pipe winding member;

[0007] A delivery pipe, wherein the delivery pipe is wound around the pipe winding groove, one end of the delivery pipe extends along the extension direction of the telescopic beam and is fixedly mounted on the 3D printing head, and the other end is used to connect to a pumping device.

[0008] In one embodiment, the mounting frame is provided with a slide groove along its length direction, the bottom of the slide groove is provided with a strip hole along the length direction of the slide groove, and sliding members are provided on opposite sides of the winding tube member, the sliding member is slidably arranged in the slide groove, and the winding tube member is slidably arranged in the strip hole.

[0009] In one embodiment, the tube winding member further comprises at least two first rolling members, at least two of the first rolling members are movably installed in the tube winding groove at intervals, and the conveying tube rolls and abuts against the first rolling members on one side of the tube winding groove.

[0010] In one embodiment, the concrete pipe retracting and releasing device includes a fixing member, which includes a top plate and two supporting legs connected to opposite sides of the top plate, and one end of the two supporting legs away from the top plate is fixedly installed on the opening edge of the pipe winding groove.

[0011] In one embodiment, the fixing member further includes a second rolling member, the second rolling member is rotatably connected between the two legs, and a side of the conveying tube away from the tube winding groove abuts against the second rolling member.

[0012] In one embodiment, a plurality of the fixing members are provided, and the plurality of the fixing members are circumferentially spaced apart along the opening edge of the pipe winding groove.

[0013] In one embodiment, the concrete pipe retracting and releasing device further includes a balancing assembly, which includes a counterweight, a transmission member, and a traction member. The transmission member is installed at one end of the mounting frame away from the telescopic beam. A connecting portion is provided on the outer side of the pipe-winding member. One end of the traction member is fixedly connected to the connecting portion, and the other end bypasses the transmission member and is fixedly connected to the counterweight.

[0014] During the contraction of the telescopic beam, the counterweight block drives the winding tube member to slide horizontally in the strip hole through the traction member.

[0015] In one embodiment, the mounting frame includes a mounting frame body and a fixing portion, wherein the fixing portion is installed at opposite ends of the mounting frame body facing the fixed beam, and the fixing portion is detachably connected with a locking piece, the locking piece is U-shaped, and the locking piece is sleeved on the fixed beam.

[0016] The present invention also proposes a cantilever structure, which includes a fixed beam, a telescopic beam and a concrete pipe retracting and releasing device. The concrete pipe retracting and releasing device is the concrete pipe retracting and releasing device as described above, one end of the telescopic beam is slidably connected to the fixed beam, and the other end is used for fixed installation with the 3D printing head, and the concrete pipe retracting and releasing device is fixedly installed on the fixed beam.

[0017] The present invention also proposes a 3D printing device, which includes a cantilever structure, a supporting structure and a 3D printing head. The cantilever structure is the cantilever structure as described above, the supporting structure is connected to the bottom end of the cantilever structure, and the 3D printing head is installed at one end of the telescopic beam away from the fixed beam.

[0018] The present invention provides a concrete pipe retracting and releasing device, which includes a mounting frame, a pipe winding member and a delivery pipe. The pipe winding member is slidably mounted on the mounting frame, and the delivery pipe is wound around the pipe winding groove of the pipe winding member, and the two ends are respectively fixed to the pumping equipment and the 3D printing head. When the concrete 3D printing equipment starts to work, the telescopic delivery pipe through the telescopic beam moves horizontally, and the delivery pipe realizes its own stable movement through the sliding of the pipe winding member relative to the mounting frame. The scheme of the present invention improves the movement stability of the delivery pipe during operation, reduces the resistance generated by the irregular movement of the delivery pipe when conveying concrete, and thus improves the structural stability of the cantilever structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a concrete pipe retracting and releasing device of the present invention;

[0021] Figure 2 for Figure 1 A structural schematic diagram of another perspective of the embodiment;

[0022] Figure 3 for Figure 1 A schematic diagram of the combined structure of the pipe winding member and the fixing member in the concrete pipe retracting and releasing device shown;

[0023] Figure 4 It is a schematic diagram of the combined structure of the cantilever structure and the 3D printing head in one embodiment of the 3D printing device of the present invention.

[0024] Description of Figure Numbers:

[0025]

[0026]

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] Existing concrete 3D printing equipment used on construction sites generally includes a cantilever structure, a supporting structure, a concrete delivery pipeline and a 3D printing head. The concrete delivery pipeline is usually directly hung on the cantilever structure of the concrete 3D printing equipment using a tank chain or other connecting structure. The above installation method will cause the turning radius of the concrete delivery pipeline to be larger, and the downward pulling force generated when conveying concrete will be larger, which will increase the load on the cantilever structure and affect the stability of the cantilever structure.

[0032] In order to solve the above problems, the present invention provides a concrete pipe retracting and releasing device 10. In one embodiment of the present invention, the concrete pipe retracting and releasing device 10 includes a mounting frame 11, a pipe winding member 12 and a delivery pipe 13. The pipe winding member 12 is slidably mounted on the mounting frame 11, and the delivery pipe 13 is wound around the pipe winding groove 121 of the pipe winding member 12, and the two ends are respectively fixed to the pumping equipment and the 3D printing head 200. When the concrete 3D printing equipment starts working, the movement of the 3D printing head 200 drives the delivery pipe 13 to move horizontally, and the delivery pipe 13 realizes its own stable movement through the sliding of the pipe winding member 12 relative to the mounting frame 11. The scheme of the present invention improves the movement stability of the delivery pipe 13 during operation, reduces the resistance generated by the irregular movement of the delivery pipe 13, and thereby improves the structural stability of the cantilever structure 100.

[0033] like Figures 1 to 4 In one embodiment, the concrete pipe retracting and releasing device 10 includes a mounting frame 11, a pipe winding member 12 and a delivery pipe 13. The mounting frame 11 is mounted on a fixed beam 20, the pipe winding member 12 is slidably mounted on the mounting frame 11, a pipe winding groove 121 is opened on the outer circumference of the pipe winding member 12, and the delivery pipe 13 is wound around the pipe winding groove 121. One end of the delivery pipe 13 extends along the extension direction of the telescopic beam 30 and is fixedly mounted on the 3D printing head 200, and the other end is used to connect a pumping device.

[0034] In this embodiment, the concrete pipe retracting and releasing device 10 is installed as an independent structure on the outer side of the fixed beam 20 of the cantilever structure 100 to realize the separate setting of the concrete pipe retracting and releasing device 10 and the main structure of the cantilever structure 100, thereby reducing the restriction of the concrete pipe retracting and releasing device 10 on the movement of the main structure of the cantilever structure 100, and thus improving the movement flexibility of the cantilever structure 100. The pipe winding member 12 is a device similar to a movable pulley structure, and a pipe winding groove 121 is provided in the circumference. The size of the pipe winding groove 121 is adapted to the size of the delivery tube 13 to ensure the installation stability between the two. When the 3D printing device starts to work, the 3D printing head 200 installed on the end of the telescopic beam 30 away from the fixed beam 20 pulls the delivery tube 13 to move, and the delivery tube 13 drives the pipe winding member 12 to slide in the mounting frame 11; the sliding of the pipe winding member 12 in the mounting frame 11 and the sliding of the pipe winding member 12 in the pipe winding groove 121 reduce the pulling force generated during the movement, reduce the load on the end of the 3D printing head 200 and the cantilever structure 100, and thereby improve the movement flexibility of the 3D printing device and the working stability of the cantilever structure 100.

[0035] The present invention provides a concrete pipe retracting and releasing device 10, which includes a mounting frame 11, a pipe winding member 12 and a delivery pipe 13. The pipe winding member 12 is slidably mounted on the mounting frame 11, and the delivery pipe 13 is wound around the pipe winding groove 121 of the pipe winding member 12, and the two ends are respectively fixed to the pumping equipment and the 3D printing head 200. When the concrete 3D printing equipment starts to work, the delivery pipe 13 is driven to move horizontally by the movement of the 3D printing head 200, and the delivery pipe 13 achieves smooth movement through the sliding of the pipe winding member 12 relative to the mounting frame 11 and the sliding of the delivery pipe 13 in the pipe winding groove 121. The scheme of the present invention improves the movement stability of the delivery pipe 13 during operation, reduces the resistance generated by the irregular movement of the delivery pipe 13, and thereby improves the structural stability of the cantilever structure 100 and the movement flexibility of the 3D printing head 200.

[0036] like Figure 1 , Figure 2 and Figure 4In one embodiment, the mounting frame 11 is provided with a slide groove 1111 along the direction of its own length, and the bottom of the slide groove 1111 is provided with a strip hole 1112 along the length direction of the slide groove 1111, and sliding members 122 are provided on opposite sides of the surrounding pipe 12. The sliding member 122 is slidably arranged in the slide groove 1111, and the surrounding pipe 12 is slidably arranged in the strip hole 1112.

[0037] In this embodiment, the mounting frame 11 includes a bottom plate and two baffles, the two baffles are connected to both sides of the bottom plate, and the connection between the bottom plate and the baffles can be welded or integrated to ensure the structural stability of the mounting frame 11. A slide groove 1111 extending along the length direction of the mounting frame 11 is formed between the bottom plate and the two baffles, and a strip hole 1112 is opened at the bottom of the slide groove 1111 along its own length direction. The design of the mounting frame 11 structure realizes a lightweight design while meeting the normal use function, reduces the load on the cantilever structure 100, and improves the structural stability of the cantilever structure 100. The sliding member 122 includes a connecting shaft and two rollers. The connecting shaft is installed inside the winding tube member 12, and its two ends extend outside the winding tube member 12 respectively. The two rollers are respectively installed at the two ends of the connecting shaft extending out of the winding tube member 12, and abut against the bottom of the slide groove 1111 on both sides of the strip hole 1112. The winding tube member 12 realizes its own movement in the strip hole 1112 by rolling the rollers in the slide groove 1111, which improves the movement flexibility of the winding tube member 12 and the retractable flexibility of the conveying tube 13, and further reduces the pulling force generated by the conveying tube 13 during the movement. In addition, the number of sliding members 122 can be one or more, which is not limited here.

[0038] In other embodiments, the slide groove 1111 may further have two corresponding second slide grooves on the two groove side walls, and the sliding member 122 slides in the second slide grooves to drive the winding tube member 12 to move in the strip hole 1112 .

[0039] like Figure 2 and Figure 3 In one embodiment, the tube winding member 12 further includes at least two first rolling members 123 , which are movably installed in the tube winding groove 121 at intervals, and the conveying tube 13 rolls against the first rolling members 123 on one side of the tube winding groove 121 .

[0040] In this embodiment, in order to further improve the smoothness of the movement of the delivery pipe 13, a first rolling member 123 is provided in the pipe winding groove 121. The first rolling member 123 can rotate freely as the delivery pipe 13 moves in the pipe winding groove 121, so as to reduce the friction generated by the delivery pipe 13 during the movement, and make the delivery pipe 13 more smoothly retracted and released, and at the same time extend the service life of the delivery pipe 13. The first rolling member 123 is made of wear-resistant material, such as stainless steel or other alloy steel, to withstand the wear that may be generated during the transportation of the delivery pipe 13. The number of the first rolling members 123 is at least two, and the specific number is not limited. By arranging a plurality of first rolling members 123 at intervals in the pipe winding groove 121, the smoothness of the movement of the delivery pipe 13 is further improved, and the pressure of the delivery pipe 13 during the movement can be evenly distributed to prevent the pipeline from being damaged.

[0041] like Figure 2 and Figure 3 In one embodiment, the concrete pipe retracting and releasing device 10 includes a fixing member 14, which includes a top plate 141 and two supporting legs 142 connected to opposite sides of the top plate 141, and one end of the two supporting legs 142 away from the top plate 141 is fixedly installed on the opening edge of the pipe groove 121.

[0042] In this embodiment, the connection method of the top plate 141 and the support leg 142 is an integrated design or welding to ensure the structural stability of the fixing member 14 itself. When the delivery pipe 13 is wound around the pipe winding groove 121, the fixing member 14 is fixedly installed on the opening edge of the pipe winding groove 121 to achieve the fixation and limitation of the delivery pipe 13, to prevent the delivery pipe 13 from changing its position due to vibration or external force during the process of conveying concrete, to ensure the structural stability and safety of the pipe winding groove 121, and to further ensure the smoothness of the movement of the delivery pipe 13.

[0043] In other embodiments, an adjustable installation design may be adopted between the fixing member 14 and the pipe winding member 12 so as to accommodate pipe winding grooves 121 and delivery pipes 13 of different sizes.

[0044] like Figure 2 and Figure 3 In one embodiment, the fixing member 14 further includes a second rolling member 143 , which is rotatably connected between the two legs 142 , and a side of the conveying tube 13 away from the tube groove 121 abuts against the second rolling member 143 .

[0045] In this embodiment, a second rolling member 143 is additionally rotatably arranged between the two legs 142 of the fixing member 14. The second rolling member 143 is located on the side of the delivery pipe 13 away from the pipe winding groove 121 and abuts against the delivery pipe 13. When the delivery pipe 13 moves in the pipe winding groove 121, the second rolling member 143 can effectively reduce the friction between the delivery pipe 13 and the fixing member 14, so that the movement of the delivery pipe 13 is smoother. At the same time, the second rolling member 143 helps to stabilize the position of the delivery pipe 13 and prevent unnecessary displacement during the movement, thereby improving the working stability of the concrete pipe retracting and releasing device 10.

[0046] like Figure 2 and Figure 3 In one embodiment, a plurality of fixing members 14 are provided, and the plurality of fixing members 14 are circumferentially spaced apart around the opening edge of the tube groove 121 .

[0047] In this embodiment, a plurality of fixing members 14 are evenly distributed on the opening edge of the pipe winding groove 121 to ensure that each point of the delivery pipe 13 can be evenly supported and fixed when winding and retracting, avoiding damage to the pipe winding member 12 or the delivery pipe 13 due to excessive local pressure, and realizing multi-point fixation between the pipe winding member 12 and the delivery pipe 13, further improving the installation stability between the pipe winding member 12 and the delivery pipe 13, and reducing displacement caused by vibration or external force. In addition, when the delivery pipe 13 moves in the pipe winding groove 121 or concrete flows in the delivery pipe 13, the interval arrangement of the plurality of fixing members 14 helps to evenly disperse these forces, prevent local stress concentration, and thus improve the safety of the concrete pipe retracting device 10.

[0048] like Figure 1 , Figure 2 and Figure 4 In one embodiment, the concrete pipe retracting and releasing device 10 further includes a balancing assembly 15, which includes a counterweight block 151, a transmission member 152, and a traction member 153. The transmission member 152 is installed at one end of the mounting frame 11 away from the telescopic beam 30, and a connecting portion 124 is arranged around the outer side of the pipe member 12. One end of the traction member 153 is fixedly connected to the connecting portion 124, and the other end bypasses the transmission member 152 and is fixedly connected to the counterweight block 151;

[0049] When the telescopic beam is in the process of contraction, the counterweight block 151 drives the surrounding pipe member 12 to slide horizontally in the strip hole 1112 through the traction member 153 .

[0050] In this embodiment, when the conveying pipe 13 is recovered, due to the heavy weight of the conveying pipe 13, the conveying pipe 13 is prone to sink downward, resulting in the problem of difficulty in recovery. Therefore, in this example, the concrete pipe retracting and releasing device 10 is additionally provided with a balancing component 15, wherein the traction member 153 can be a steel cable to ensure that it has sufficient tensile resistance and improve the stability of the work. One end of the traction member 153 is fixedly connected to the connecting portion 124 on the winding pipe member 12, and its connection method can be welding, and the other end is fixedly connected to the counterweight block 151, and its connection method can be an integrated design connection to ensure the installation stability of the entire structure. The transmission member 152 is installed at the end of the mounting frame 11 away from the telescopic beam. The transmission member 152 can be a certain pulley. On the one hand, the gravity of the counterweight block 151 in the vertical direction can be converted into traction in the horizontal direction to control the movement of the winding pipe member 12. On the other hand, the friction between the traction member 153 and the mounting frame 11 during the traction process is reduced to improve its own service life and the movement smoothness of the winding pipe member 12.

[0051] When the conveying pipe 13 is recovered, the counterweight 151 converts its own gravity into a traction force in the horizontal direction through the conversion effect of the transmission member 152, and this force is transmitted through the traction member 153, so that the pipe winding member 12 slides horizontally in the strip hole 1112, so that the conveying pipe 13 is always kept in the horizontal direction for recovery, thereby improving the recovery efficiency of the conveying pipe 13. In a more preferred embodiment, the balance component 15 can be provided with two sets of transmission members 152 and traction members 153 in parallel, on the one hand, the traction force can be evenly distributed to the two traction members 153, reducing the pulling force borne by the single traction member 153, and on the other hand, the traction stability between the traction member 153 and the pipe winding member 12 is improved to ensure that the pipe winding member 12 moves smoothly in the strip hole 1112.

[0052] like Figure 2 and Figure 4 In one embodiment, the mounting frame 11 includes a mounting frame body and a fixing portion 112. The fixing portion 112 is installed at the opposite ends of the mounting frame body facing the fixed beam 20. The fixing portion 112 is detachably connected with a locking piece 1121. The locking piece 1121 is U-shaped and is sleeved on the fixed beam 20.

[0053] In this embodiment, the connection between the fixing part 112 and the mounting frame body can be made by welding or integrated design to improve the installation stability between the two. The design of the U-shaped locking member 1121 enables the locking member 1121 to be firmly connected to the fixing beam 20, providing stable support for the mounting frame 11. At the same time, the U-shaped structure can effectively disperse the load force borne by the locking member 1121, reduce the looseness between the locking member 1121 and the fixing beam 20, and thus ensure the installation stability of the mounting frame 11. At the same time, the locking member 1121 and the fixing part 112 can be connected by bolts. When the position of the mounting frame 11 needs to be moved or adjusted, the locking member 1121 can be quickly disassembled and reinstalled, thereby improving the installation flexibility and efficiency of the mounting frame 11.

[0054] like Figure 2 and Figure 4 The present invention further provides a cantilever structure 100, which includes a fixed beam 20, a telescopic beam 30 and a concrete pipe retracting device 10. One end of the telescopic beam 30 is slidably connected to the fixed beam 20, and the other end is used for fixed installation with a 3D printing head 200. The concrete pipe retracting device 10 is fixedly installed on one side of the fixed beam 20. The specific structure of the concrete pipe retracting device 10 refers to the above embodiment. Since the concrete pipe retracting device 10 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0055] In a specific embodiment, one end of the telescopic beam 30 is slidably connected to the fixed beam 20, so that the telescopic beam 30 can adjust the length of the extension relative to the fixed beam 20 according to the construction needs, thereby adapting to different construction distances. The other end of the telescopic beam is used for fixed installation with the 3D printing head 200 to achieve precise control during the printing process. The concrete pipe retracting device 10 is fixedly installed on one side of the fixed beam 20 to reduce the load of the main body of the cantilever structure 100 dragging the conveying pipe 13. At the same time, the concrete pipe retracting device 10 is installed on one side of the fixed beam 20 as a separate structure to provide the maximum movement space for the main body movement, thereby improving the movement flexibility of the cantilever structure 100.

[0056] The present invention further provides a 3D printing device, which includes a cantilever structure 100, a support structure (not shown) and a 3D printing head 200, wherein the support structure is connected below the cantilever structure 100, and the 3D printing head 200 is installed at one end of the telescopic beam away from the fixed beam 20. The specific structure of the cantilever structure 100 refers to the above embodiment. Since the cantilever structure 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0057] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A concrete pipe retracting and releasing device, applied to the cantilever structure of concrete 3D printing equipment, the cantilever structure includes a fixed beam and a telescopic beam, characterized in that: The concrete pipe retracting and releasing device comprises: a mounting frame, the mounting frame being mounted on the fixed beam; A pipe winding member, the pipe winding member is slidably mounted on the mounting frame, and a pipe winding groove is circumferentially provided on the outer side of the pipe winding member; A delivery pipe, wherein the delivery pipe is wound around the pipe winding groove, one end of the delivery pipe extends along the extension direction of the telescopic beam and is fixedly mounted on the 3D printing head, and the other end is used to connect to a pumping device.

2. The concrete pipe retracting and releasing device according to claim 1, characterized in that: The mounting frame is provided with a slide groove along its length direction, the bottom of the slide groove is provided with a strip hole along the length direction of the slide groove, and sliding members are provided on opposite sides of the pipe winding member, the sliding member is slidably arranged in the slide groove, and the pipe winding member is slidably arranged in the strip hole.

3. The concrete pipe retracting and releasing device according to claim 2, characterized in that: The tube winding member further comprises at least two first rolling members, which are movably installed in the tube winding groove at intervals, and the conveying tube rolls against the first rolling members on one side facing the tube winding groove.

4. The concrete pipe retracting and releasing device according to claim 3, characterized in that: The concrete pipe retracting and releasing device comprises a fixing member, which comprises a top plate and two supporting legs connected to opposite sides of the top plate, and one end of the two supporting legs away from the top plate is fixedly installed on the opening edge of the pipe winding groove.

5. The concrete pipe retracting and releasing device according to claim 4, characterized in that: The fixing member further comprises a second rolling member, which is rotatably connected between the two supporting legs, and a side of the conveying tube away from the tube winding groove abuts against the second rolling member.

6. The concrete pipe retracting and releasing device according to claim 5, characterized in that: A plurality of fixing members are provided, and the plurality of fixing members are circumferentially spaced apart along the opening edge of the pipe-winding groove.

7. The concrete pipe retracting and releasing device according to any one of claims 2 to 6, characterized in that: The concrete pipe retracting and releasing device further comprises a balancing assembly, which comprises a counterweight, a transmission member and a traction member, wherein the transmission member is mounted on an end of the mounting frame away from the telescopic beam, a connecting portion is arranged on the outer side of the pipe winding member, one end of the traction member is fixedly connected to the connecting portion, and the other end of the traction member is fixedly connected to the counterweight by bypassing the transmission member; During the contraction of the telescopic beam, the counterweight block drives the winding tube member to slide horizontally in the strip hole through the traction member.

8. The concrete pipe retracting and releasing device according to claim 7, characterized in that: The mounting frame includes a mounting frame body and a fixing portion, wherein the fixing portion is installed at opposite ends of the mounting frame body facing the fixed beam, and the fixing portion is detachably connected with a locking piece, the locking piece is U-shaped, and the locking piece is sleeved on the fixed beam.

9. A cantilever structure, characterized in that: The cantilever structure includes a fixed beam, a telescopic beam and a concrete pipe retracting and releasing device. The concrete pipe retracting and releasing device is the concrete pipe retracting and releasing device as described in any one of claims 1 to 8. One end of the telescopic beam is slidably connected to the fixed beam, and the other end is used for fixed installation with the 3D printing head. The concrete pipe retracting and releasing device is fixedly installed on the fixed beam.

10. A 3D printing device, characterized in that: The 3D printing device includes a cantilever structure, a supporting structure and a 3D printing head, the cantilever structure is the cantilever structure as claimed in claim 9, the supporting structure is connected to the bottom end of the cantilever structure, and the 3D printing head is installed at one end of the telescopic beam away from the fixed beam.

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