Distributed distributing boom group for large-volume integrated pouring

Abstract

The invention discloses a distributed material distributing rod group for large-volume integrated pouring, which comprises a pipe rod and a hose, and the discharging end of the pipe rod is provided with a posture adjusting mechanism for adjusting the orientation of the outlet of the hose and a driving assembly for driving the posture adjusting mechanism; the posture adjusting mechanism comprises a rotating piece concentrically arranged at the bottom end of the pipe rod in a sleeving mode and a lifting piece arranged on one side of the rotating piece and used for lifting the bottom of the hose. The driving assembly drives the rotating part to drive the hose to circumferentially rotate around the axis of the hose rod in a forward rotating state; according to the invention, the posture adjusting mechanism is arranged at the discharging end of the pipe rod, and the same driving assembly independently drives the posture adjusting mechanism to realize circumferential rotation and lifting actions of the hose, so that the driving assembly controls different movement directions of the hose in forward rotation and reverse rotation states, and automatic adjustment of the direction of an outlet of the hose is realized; according to the structure, rotation and lifting of the hose can be completed through a single driving source.

Description

Technical Field

[0001] This invention belongs to the field of concrete construction equipment technology, specifically relating to a distributed placing boom assembly for large-volume integrated pouring. Background Technology

[0002] As the end effector of a concrete placing boom, its basic function is to accurately deliver and spread the pumped concrete to various points on the work surface through a flexible boom system. However, when faced with integrated pouring tasks of large-volume concrete, such as large raft foundations, a single placing boom has limited coverage and is difficult to move quickly during continuous construction. Therefore, a distributed layout scheme is required, that is, multiple placing booms are set up in sections above or around the giant work surface, and continuously poured to their respective areas simultaneously and evenly through unified scheduling.

[0003] For example, Chinese Patent Publication No. CN118110346B discloses a concrete placing boom, which includes a placing boom support frame, a concrete pipe, and a placing boom turntable. The placing boom turntable is movably sleeved on the turntable at the top of the placing boom support frame via a rotating sleeve. The placing boom turntable is driven to rotate by a turntable motor installed on the placing boom support frame. Telescopic support frames are respectively connected to the sleeves at both ends of the placing boom turntable. The telescopic support frame includes multiple telescopic cylinders, which are inserted sequentially from the outside to the inside. The innermost telescopic cylinder is then inserted into the sleeve of the placing boom turntable. A lead screw and a guide rod are arranged side by side inside the placing boom turntable. The two ends of the lead screw and the guide rod are respectively inserted into the telescopic support frame. Moving blocks are sleeved on the lead screw and the guide rod. The moving blocks are threadedly connected to the lead screw and slidably connected to the guide rod. A telescopic control motor is provided on the placing boom turntable, and the telescopic control motor is connected to the lead screw through bevel gear transmission.

[0004] This application uses multiple sets of clamps and corresponding gear support frames, and then drives the transmission gears on all the gear support frames to rotate through a pipe bending motor, causing the fabric hose to bend and deform. Arranging multiple connected mechanical structures on the fabric hose not only increases the hose's own weight and makes it difficult to adjust, but also damages the hose's own flexibility. Therefore, its cost and feasibility are limited.

[0005] Therefore, it is necessary to provide a distributed concrete placing boom assembly for large-volume integrated casting to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a distributed concrete placing boom assembly for large-volume integrated casting, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a distributed material placing rod assembly for large-volume integrated casting, comprising a pipe rod and a hose, wherein the discharge end of the pipe rod is provided with an attitude adjustment mechanism for adjusting the orientation of the hose outlet, and a drive assembly for driving the attitude adjustment mechanism; The attitude adjustment mechanism includes a rotating component concentrically sleeved at the bottom end of the pipe rod, and a lifting component placed on one side of the rotating component for lifting the bottom of the hose; the drive assembly drives the rotating component to rotate the hose around the pipe rod axis in the forward rotation state, and drives the lifting component to move the hose up and down in the reverse rotation state.

[0008] As a preferred technical solution of the present invention, the driving component includes a servo motor, a drive shaft is connected to the output end of the servo motor, a cylindrical cam is sleeved on the outside of the drive shaft, and a one-way drive gear is connected to the bottom of the drive shaft; the cylindrical cam rotates synchronously with the drive shaft when the drive shaft rotates forward, and the one-way drive gear rotates synchronously with the drive shaft when the drive shaft rotates in reverse.

[0009] As a preferred technical solution of the present invention, the cylindrical cam is hollow inside and open at the top. A hole for the drive shaft to pass through is located at the center of the bottom end of the cylindrical cam. A slot is formed at an equal angle on the inner wall of the hole. A locking block is rotatably connected within the slot. One side of the locking block extending into the hole is inclined, and the other side is horizontal. A spring is fixed within the slot near the right-angled edge of the locking block. When the drive shaft abuts against the right-angled edge of the locking block, the locking block abuts against the inner wall of the slot, causing the entire cylindrical cam to rotate. When the drive shaft abuts against the inclined side of the locking block, it pushes the locking block into the slot and compresses the spring. The center of the one-way drive gear is also penetrated by the drive shaft, and its structure is the same as that of the cylindrical cam driven by the drive shaft, but the rotation direction is opposite.

[0010] As a preferred technical solution of the present invention, the rotating component meshes with the one-way drive gear and rotates in a circumferential direction, and the lifting component reciprocates and lifts under the rotation of the cylindrical cam; a fixed plate for mounting the servo motor is fixed at the discharge end of the tube rod, and a base plate concentrically sleeved on the tube rod and used to support the rotating component is also provided at the bottom end of the fixed plate; multiple rods are fixedly installed between the fixed plate and the base plate.

[0011] As a preferred technical solution of the present invention, the rotating component includes a transmission gear disc sleeved on the discharge end of the tube rod, and a flange disposed below the transmission gear disc and fixedly connected to the flange end of the top of the hose; the transmission gear disc meshes with a one-way drive gear disc.

[0012] As a preferred technical solution of the present invention, the lifting member includes a tie rod that runs vertically through the chassis, and a bearing ring sleeved on the bottom of the hose and connected to the tie rod; the top of the tie rod is provided with a connecting part that extends into the irregular groove on the outer surface of the cylindrical cam.

[0013] As a preferred technical solution of the present invention, the irregular groove on the outer surface of the cylindrical cam is a closed curved groove, and its trajectory has an axial height variation along the circumferential direction; the connecting part includes a fixed sleeve fixed to the top of the pull rod, and a movable rod slidably disposed in the fixed sleeve and whose end extends into the irregular groove.

[0014] As a preferred technical solution of the present invention, the chassis is provided with an outwardly extending protrusion, and a groove is provided in the protrusion for the pull rod to pass through vertically and slide horizontally. A spring connected to the pull rod is provided in the groove.

[0015] As a preferred technical solution of the present invention, a vertical rod is fixed at the bottom of the fixed plate, which extends vertically downward through the movable rod to limit the movement trajectory of the movable rod.

[0016] As a preferred technical solution of the present invention, the bottom of the pull rod is provided with an irregular opening, the outer ring of the bearing ring is provided with a fixing block, and a movable block that can be horizontally inserted into the irregular opening is rotatably connected to the fixing block.

[0017] Compared with the prior art, the beneficial effects of the present invention are: In this invention, by setting an attitude adjustment mechanism at the discharge end of the tube rod, and independently driving the attitude adjustment mechanism by the same drive component to realize the circumferential rotation and lifting action of the hose, the drive component controls different movement directions of the hose in forward and reverse states, realizing automatic adjustment of the hose outlet orientation. This structure can complete the rotation and lifting of the hose with a single drive source, which significantly simplifies the layout of the drive system, reduces the weight of the equipment and manufacturing cost, and avoids the damage to the flexibility of the hose caused by setting multiple mechanical structures on the hose. It effectively improves the adaptability and reliability of the material placing rod assembly under complex construction conditions. Furthermore, by controlling different movements in forward and reverse directions, the complexity and failure points of the electrical control system are reduced, making the operation more intuitive and precise, and improving the response speed and positioning accuracy during the material placing process. In continuous pouring of large-volume concrete, this design can flexibly adjust the discharge direction without interrupting the material placement process, avoiding uneven pouring or construction interruption caused by manual intervention, and significantly improving the continuity and uniformity of integrated pouring. In addition, through the coordinated action of the attitude adjustment mechanism, the hose can achieve natural tilting discharge during the lifting process, without the need for additional drive devices, further reducing the use of power components and lowering energy consumption. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of the distributed concrete placing boom assembly used for large-volume integrated casting; Figure 2 This is a schematic diagram showing the connection between the attitude adjustment mechanism and the hose; Figure 3 This is a schematic diagram showing the connection between the attitude adjustment mechanism and the drive components; Figure 4 for Figure 2 Sectional view at point AA; Figure 5 This is a top view of a cylindrical cam; Figure 6 This is a schematic diagram of the structure of a unidirectional drive gear disk; Figure 7 This is a schematic diagram showing the connection between the unidirectional drive gear and the rotating component. Figure 8 This is a schematic diagram showing the connection between the cylindrical cam and the connecting part; Figure 9 for Figure 3 Enlarged view of region B in the middle; Figure 10 for Figure 4 Enlarged view of region C in the middle; Figure 11 This is a cross-sectional view of the connection point between the movable block and the tie rod.

[0019] In the picture: 1. Pipe rod; 101. Fixed plate; 101a. Vertical rod; 102. Chassis; 102a. Extended protrusion; 102b. Spring; 103. Hose; 2. Servo motor; 201. Cylindrical cam; 201a. Spring piece 1; 201b. Groove; 201c. Locking block 1; 202. Transmission gear plate; 202a. Flange; 203, drive shaft; 203a, card slot; 204. One-way drive gear plate; 204a. Placement slot; 204b. Second locking block; 204c. Second spring piece; 205, fixed sleeve; 205a, movable rod; 3. Pull rod; 4. Bearing ring; 401. Fixed block; 402. Push plate; 403. Movable block; 404. Insert rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please see Figures 1 to 8 This invention provides a distributed material placing boom assembly for large-volume integrated casting, mainly used to automatically adjust the outlet orientation of the flexible hose 103, thereby improving the automation performance of the device. The distributed material placing boom assembly includes a pipe rod 1 and a flexible hose 103 positioned below its outlet end; the outlet end of the pipe rod 1 has an attitude adjustment mechanism that drives the flexible hose 103 to rotate circumferentially and raise its height, thus adjusting the outlet direction of the flexible hose 103.

[0022] Furthermore, refer to Figure 2 and Figure 3 The attitude adjustment mechanism includes a rotating component concentrically sleeved at the bottom of the tube rod 1. This rotating component is fixed to the flange end at the top of the hose 103. When the rotating component rotates circumferentially, it will drive the hose 103 to rotate in the same direction. At the same time, the hose 103 has a certain weight, so there will be no inconsistency in the up-down rotation during the rotation of the hose 103. The attitude adjustment mechanism also includes a lifting component placed on one side of the rotating component for lifting the bottom of the hose 103. A drive assembly is installed on the discharge end of the tube rod 1. This drive assembly independently drives the rotating component and the lifting component to move in the forward or reverse rotation state, respectively.

[0023] It is important to note that during actual operation, the forward and reverse rotation of the drive component is determined by the control system based on the required adjustment. When it is necessary to adjust the circumferential discharge direction of the hose 103, the drive component rotates forward, driving only the rotating part to rotate the hose 103; when it is necessary to adjust the discharge height of the hose 103, the drive component rotates in reverse, driving only the lifting part to raise or lower the hose 103. The rotation and raising / lowering actions do not interfere with each other and can be performed sequentially during continuous pouring without interrupting the material distribution.

[0024] Reference Figure 4 In this embodiment, preferably, the drive component includes a servo motor 2, and a drive shaft 203 is fixedly connected to the bottom of the output end of the servo motor 2 via a coupling (the coupling is not shown in the figure). A cylindrical cam 201 is sleeved on the outside of the upper position of the drive shaft 203. The cylindrical cam 201 rotates synchronously with the drive shaft 203 in the forward or reverse rotation state. A one-way drive gear 204 is rotatably connected to the bottom of the drive shaft 203.

[0025] In the above structure, when the drive shaft 203 is driven by the servo motor 2 in the forward direction, it will drive the cylindrical cam 201 to rotate, and the one-way drive gear 204 will not rotate at this time; conversely, when the drive shaft 203 is driven by the servo motor 2 in the reverse direction, it will drive the one-way drive gear 204 to rotate, while the cylindrical cam 201 will not rotate.

[0026] Furthermore, refer to Figure 5 The cylindrical cam 201 is hollow inside and open at the top. At the center of the bottom end of the cylindrical cam 201, there is a hole through which the drive shaft 203 passes. A slot 201b is formed at an equal angle on the inner wall of the hole. A locking block 201c is rotatably connected within the slot 201b. One side of the locking block 201c extending into the hole is inclined, and the other side is horizontal (i.e., a right-angled side). A spring piece 201a is fixed within the slot 201b, near the right-angled side of the locking block 201c. When the drive shaft 201... When the right-angle side of the 3rd block 201c abuts, the 3rd block 201c abuts against the inner wall of the slot 201b and drives the entire cylindrical cam 201 to rotate. When the drive shaft 203 abuts against the inclined side of the 3rd block 201c, it pushes the 3rd block 201c into the slot 201b and compresses the spring 201a at the same time. At this time, the cylindrical cam 201 cannot provide thrust through the 3rd block 201c and therefore cannot rotate. This achieves the purpose of driving the cylindrical cam 201 only in a specific direction.

[0027] Similarly, refer to Figure 6 The unidirectional drive gear 204 is also penetrated by the drive shaft 203 at its center, and the inner wall of the unidirectional drive gear 204 is also provided with a placement groove 204a at an equal angle. A second locking block 204b is rotatably connected in the placement groove 204a. At the same time, a second spring piece 204c is fixed on the right-angle side of the second locking block 204b. The second locking block 204b has the same structure as the first locking block 201c, but faces opposite directions. That is, when the drive shaft 203 contacts the right-angle side of the first locking block 201c, the inclined surface of the second locking block 204b is pushed into the placement groove 204a by the drive shaft. The entire unidirectional drive gear 204... In this state, it will not be driven. Similarly, when the one-way drive gear 204 is driven (drive shaft 203 pushes the right-angle side of the second card block 204b), drive shaft 203 will squeeze the inclined surface of the first card block 201c, and the cylindrical cam 201 will no longer rotate, so as to realize the rotation of the one-way drive gear 204 independently. Due to the setting of the first spring 201a and the second spring 204c, when drive shaft 203 rotates in the direction of driving the cylindrical cam 201 and the one-way drive gear 204, the first card block 201c and the second card block 204b will fit against drive shaft 203 until they engage with drive shaft 203.

[0028] In the above structure, after the first locking block 201c is compressed into the slot 201b, although the drive shaft 203 is always in contact with the first locking block 201c under the action of the rebound force of the first spring piece 201a, the frictional force is less than the force of the drive cylindrical cam 201 and the lifting member, so there will be no rotation. Similarly, under the action of the gravity of the rotating member and the hose 103, the one-way drive gear disk 204 will not drive the rotating member to rotate after the second locking block 204b is compressed into the placement slot 204a.

[0029] Furthermore, refer to Figure 7 The drive shaft 203 has slots 203a for the first card block 201c and the second card block 204b to be inserted. The slots 203a are grooves that extend axially.

[0030] Reference Figures 2 to 4 In this embodiment, preferably, an integrated fixing plate 101 is installed at the discharge end of the tube rod 1, and a base plate 102 is concentrically sleeved on the tube rod 1 at the bottom end of the fixing plate 101. Multiple rods (not shown in the figure) are fixedly installed between the fixing plate 101 and the base plate 102 to achieve fixed installation of the fixing plate 101 and the base plate 102. At the same time, the base plate 102 can support the rotating parts. There is an annular gap between the tube rod 1 and the base plate 102. The servo motor 2 is installed on the fixing plate 101.

[0031] Reference Figure 2 and Figure 7 In this embodiment, preferably, the rotating component includes a transmission gear 202 sleeved on the discharge end of the tube rod 1. An integral and concentric flange 202a is provided below the transmission gear 202. The flange 202a is fixedly connected to the flange end of the top of the hose 103 by bolts. The inner wall of the transmission gear 202 and the flange 202a is in contact with the outer surface of the tube rod 1. For stable transmission, both the transmission gear 202 and the one-way drive gear 204 are in contact with the top surface of the chassis 102. The one-way drive gear 204 is meshed with the transmission gear 202. When the one-way drive gear 204 rotates, it will rotate the entire rotating component and the hose 103 fixedly connected to the bottom end through the transmission gear 202, thereby realizing the adjustment of the circumferential position of the hose 103.

[0032] Furthermore, refer to Figure 2 and Figure 8The lifting component includes a pull rod 3 that moves through the chassis 102 and a bearing ring 4 that is fixedly sleeved on the bottom of the pull rod 3. The bearing ring 4 is sleeved on the bottom of the hose 103. The top of the pull rod 3 has a connecting part that extends horizontally into the irregular groove on the outer surface of the cylindrical cam 201. When the cylindrical cam 201 is driven by the drive shaft 203 to rotate, it will drive the pull rod 3 to make vertical lifting and lowering movements through the connecting part. During the lifting process of the pull rod 3, it will drive the bearing ring 4 to lift the hose 103, which has been adjusted in circumferential position, so as to realize automatic discharge at the designated position.

[0033] In the above structure, when the hose 103 rotates circumferentially, the bearing ring 4 has an inner ring portion and an outer ring portion. The inner ring portion is fixedly connected to the hose 103, and the two rotate synchronously. The outer ring of the bearing ring 4 is connected to the pull rod 3, and the outer ring portion here does not move. The irregular groove on the outer surface of the cylindrical cam 201 is a closed curved groove, and its trajectory has high and low changes in the circumferential direction.

[0034] Furthermore, refer to Figure 9 An integral fixing block 401 is installed on the outer surface of the outer ring of the bearing ring 4. A movable block 403 is rotatably connected to the outside of the fixing block 401. The movable block 403 is detachably installed on the pull rod 3.

[0035] In the above structure, the opposite surfaces of the fixed block 401 and the movable block 403 are inclined relative to each other. When the pull rod 3 drives the movable block 403 to rise, the movable block 403 will drive the fixed block 401 to rise synchronously. The fixed block 401 is subjected to the weight of the bearing ring 4 and the hose 103, and the fixed block 401 will rotate with the movable block 403, so that the bottom opening of the hose 103 is tilted and raised.

[0036] In summary, by using a servo motor 2 to drive a cylindrical cam 201 to raise and lower the pull rod 3, and then using a one-way drive gear 204 to drive a transmission gear 202 to rotate circumferentially, the automatic adjustment of the outlet orientation of the hose 103 is achieved. This structure can complete the rotation and raising and lowering of the hose with a single drive source, which significantly simplifies the layout of the drive system, reduces the weight of the equipment and manufacturing costs, and avoids damaging the flexibility of the hose by setting multiple mechanical structures on it.

[0037] Example 2: Please see Figure 2 , Figure 10Based on Embodiment 1, in order to ensure that the hose 103 is not obstructed by the pull rod 3 during circumferential rotation, the connection between the pull rod 3 and the bearing ring 4 is improved: at this time, there is an outwardly extending protrusion 102a on the chassis 102 that is parallel to the connection. The extension protrusion 102a has a groove formed inside for the pull rod 3 to pass through vertically and move laterally. A spring 102b is also installed in the groove of the extension protrusion 102a. In order to prevent the spring 102b from falling out of the groove, the two ends of the spring 102b are welded and fixed to the pull rod 3 and the inner wall of the groove respectively by spot welding.

[0038] In the above structure, when the hose 103 is rotating circumferentially, if it is blocked by the pull rod 3, the pull rod 3 will be pushed outward by the hose 103 towards the chassis 102, and at the same time squeeze the spring 102b. When the hose 103 passes the pull rod 3, the spring 102b will rebound and return the pull rod 3 to its original position.

[0039] Furthermore, refer to Figure 10 The connecting part includes a fixed sleeve 205 and a movable rod 205a that slides horizontally within the fixed sleeve 205. A slot is pre-drilled at the top of the pull rod 3 for the fixed sleeve 205 to be fixedly installed. The movable rod 205a extends into a shaped groove on the outer surface of the cylindrical cam 201. When the cylindrical cam 201 rotates, the movable rod 205a in the connecting part moves along the groove under the constraint of the shaped groove. Due to the change in the axial height of the shaped groove, the movable rod 205a is driven to move up and down, thereby driving the pull rod 3 to rise and fall; the guide of the shaped groove... The stroke and lift angle are designed according to the required lifting stroke; a vertical rod 101a is also fixed on the bottom end face of the fixed plate 101, which is vertically downward and passes through the movable rod 205a. The vertical rod 101a can limit the position of the movable rod 205a, so that the end of the movable rod 205a is always in the irregular groove of the cylindrical cam 201. When the pull rod 3 is pushed by the hose 103, the movable rod 205a will not separate from the irregular groove, ensuring that the cylindrical cam 201 can always play the function of lifting the pull rod 3.

[0040] Compared to implementation one, by extending the protrusion 102a and the spring 102b, the purpose of moving the lever 3 can be achieved, thus realizing the obstacle avoidance function. The cooperation between the movable rod 205a and the vertical rod 101a can ensure that the lever 3 is always connected to the cylindrical cam 201 during movement, ensuring that the lever can rise and fall normally.

[0041] Example 3: Please see Figure 9 and Figure 11Based on Embodiment 2, the movable block 403 and the pull rod 3 are modified to be detachable to allow manual operation of the hose 103 under special circumstances. An irregularly shaped opening (the irregularly shaped opening is the same shape as the movable block 403, approximately an isosceles trapezoid tilted at 90°) is provided at the bottom of the pull rod 3 for the movable block 403 to be inserted horizontally. A push plate 402 is slidably connected in the movable block 403 in the horizontal direction. The top of the push plate 402 forms a stepped groove that varies in height along the sliding direction. At least two vertically sliding insert rods 404 are also inserted in the movable block 403. The bottom end of the insert rod 404 abuts against the surface of the stepped groove. When the push plate 402 slides to the high point of the stepped groove and contacts the bottom end of the insert rod 404, the top end of the insert rod 404 extends upward out of the movable block 403 and is inserted into the groove of the irregularly shaped opening of the pull rod 3. When the push plate 402 slides to the low point of the stepped groove and contacts the bottom end of the insert rod 404, the insert rod 404 falls down and exits the groove.

[0042] In the above structure, the push plate 402 has upward protrusions at both ends to prevent it from coming out of the movable block 403. At the same time, the bottom of one side of the insertion rod 404 is inclined. When the push plate 402 is pushed, the higher part of the stepped groove lifts and locks the insertion rod 404. The stepped groove and the insertion rod 404 are in a tight abutting state, which realizes the limitation of the push plate 402. When pulled back, the insertion rod 404 is unlocked when it falls to the lower part by gravity. At this time, the push plate 402 does not need to be limited.

[0043] Compared to Implementation 2, by changing the movable block 403 to a detachable structure, when facing complex pouring conditions, the connection between the tie rod 3 and the hose 103 can be disconnected, and the operation can be carried out manually, resulting in greater overall flexibility.

[0044] Although embodiments of the invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A distributed concrete placing boom assembly for large-volume integrated casting, comprising pipe rods and flexible hoses, characterized in that: The discharge end of the tube is provided with an attitude adjustment mechanism for adjusting the orientation of the hose outlet, and a drive assembly for driving the attitude adjustment mechanism. The attitude adjustment mechanism includes a rotating component concentrically sleeved at the bottom end of the pipe rod, and a lifting component placed on one side of the rotating component for lifting the bottom of the hose; the drive assembly drives the rotating component to rotate the hose around the pipe rod axis in the forward rotation state, and drives the lifting component to move the hose up and down in the reverse rotation state.

2. The distributed concrete placing boom assembly for large-volume integrated casting according to claim 1, characterized in that: The drive assembly includes a servo motor, a drive shaft connected to the output end of the servo motor, a cylindrical cam sleeved on the outside of the drive shaft, and a one-way drive gear connected to the bottom of the drive shaft; the cylindrical cam rotates synchronously with the drive shaft when the drive shaft rotates forward, and the one-way drive gear rotates synchronously with the drive shaft when the drive shaft rotates in reverse.

3. A distributed concrete placing boom assembly for large-volume integrated casting according to claim 2, characterized in that: The cylindrical cam is hollow inside and open at the top. At the center of the bottom end of the cylindrical cam, there is a hole through which the drive shaft passes. The inner wall of the hole has slots at equal angles. A locking block is rotatably connected within the slot. One side of the locking block extends into the hole at an angle, while the other side is horizontal. A spring is fixed within the slot near the right-angled edge of the locking block. When the drive shaft abuts against the right-angled edge of the locking block, the locking block abuts against the inner wall of the slot, causing the entire cylindrical cam to rotate. When the drive shaft abuts against the angled side of the locking block, it pushes the locking block into the slot and compresses the spring. The center of the one-way drive gear is also penetrated by the drive shaft, and its structure is the same as that of the cylindrical cam driven by the drive shaft, but in the opposite direction of rotation.

4. A distributed concrete placing boom assembly for large-volume integrated casting according to claim 2, characterized in that: The rotating component meshes with a one-way drive gear and rotates in a circumferential direction. The lifting component reciprocates and lifts under the rotation of a cylindrical cam. A fixed plate for mounting a servo motor is fixed at the discharge end of the tube rod. A base plate concentrically sleeved on the tube rod and used to support the rotating component is also provided at the bottom end of the fixed plate. Multiple rods are fixedly installed between the fixed plate and the base plate.

5. A distributed concrete placing boom assembly for large-volume integrated casting according to claim 4, characterized in that: The rotating component includes a transmission gear disc sleeved on the discharge end of the tube rod, and a flange disposed below the transmission gear disc and fixedly connected to the flange end of the top of the hose; the transmission gear disc meshes with a one-way drive gear disc.

6. A distributed concrete placing boom assembly for large-volume integrated casting according to claim 4, characterized in that: The lifting component includes a vertically penetrating tie rod through the chassis, and a bearing ring sleeved on the bottom of the hose and connected to the tie rod; the top of the tie rod is provided with a connecting part extending into the irregular groove on the outer surface of the cylindrical cam.

7. A distributed concrete placing boom assembly for large-volume integrated casting according to claim 6, characterized in that: The irregular groove on the outer surface of the cylindrical cam is a closed curved groove, and its trajectory has an axial height variation along the circumferential direction; the connecting part includes a fixed sleeve fixed to the top of the pull rod, and a movable rod slidably disposed in the fixed sleeve with its end extending into the irregular groove.

8. A distributed concrete placing boom assembly for large-volume integrated casting according to claim 6, characterized in that: The chassis is provided with an outwardly extending protrusion, and a groove is provided in the protrusion for the pull rod to pass through vertically and slide horizontally. A spring connected to the pull rod is provided in the groove.

9. A distributed concrete placing boom assembly for large-volume integrated casting according to claim 8, characterized in that: The bottom of the fixed plate is fixed with a vertical rod that extends downward through the movable rod, which is used to limit the movement trajectory of the movable rod.

10. A distributed concrete placing boom assembly for large-volume integrated casting according to claim 6, characterized in that: The bottom of the pull rod has an irregularly shaped opening, and the outer ring of the bearing ring is provided with a fixing block. A movable block that can be horizontally inserted into the irregularly shaped opening is rotatably connected to the fixing block.

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