Concrete distribution device

Abstract

This invention belongs to the technical field of concrete placing devices, specifically relating to a concrete placing device, including a mobile vehicle body and a connecting base. The mobile vehicle body is equipped with wheels; the connecting base is connected to a placing boom; the connecting base is connected to the mobile vehicle body via a connecting assembly; four support seats are fixed on the mobile vehicle body, each support seat having a hinged leg; the connecting base is connected to a connecting frame via a connecting cylinder; the connecting frame has guide grooves connecting to each leg, and each leg is connected to a guide pin that mates with the guide groove; four connecting arms are slidably connected to the connecting base, and a return spring is provided between the connecting arms and the connecting base; each support seat corresponds to one connecting arm, the connecting arm has a connecting groove, and the support seat has a corresponding first locking pin. This device enables conversion between multiple usage modes, such as a mobile concrete placing machine, a steel column placing machine, and an internal climbing concrete placing machine, significantly improving equipment utilization and construction flexibility.

Description

Technical Field

[0001] This invention belongs to the technical field of concrete placing devices, specifically relating to a concrete placing device. Background Technology

[0002] Concrete placing booms are key equipment in building construction, and their development is becoming increasingly diversified to adapt to different construction scenarios and process requirements. Based on different support and mobility methods, the mainstream technical routes can be mainly divided into the following categories: First, there are steel column placing booms fixed to the building structure, such as the solution disclosed in patent document CN206267536U. These utilize existing steel columns on the construction site, using a connecting base with pads and pins and bolts for fixation. Their design is specifically for steel columns, and the base and the placing boom body are usually fixedly connected or have a dedicated interface, making it difficult to easily convert to other modes of use, resulting in limited functionality. Second, there are mobile placing booms, such as the wheeled placing boom disclosed in patent document CN206917284U. These use a chassis with wheels and a specific boom structure to improve the placing range and mobility. However, such equipment requires outriggers to be deployed at the work site to ensure stability. The chassis, support structure, and placing boom body are usually rigidly connected by bolts. The entire system is specifically designed for mobile working conditions, making it difficult to directly disassemble and use the core placing part for fixed or climbing scenarios. Thirdly, there are internal climbing concrete placing booms, such as the one disclosed in patent document CN210828360U, which integrates a frame-type climbing device. It achieves autonomous climbing through the cooperation of claws and guide rails, significantly improving the construction efficiency of high-rise buildings. However, the climbing frame of this equipment is deeply integrated with or specially adapted to the tower body of the concrete placing boom, and its base is designed for specific environments such as elevator shafts. It also lacks the versatility to quickly interchange with mobile chassis or steel columns. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention provides a concrete placing device that can switch between various working modes, such as mobile, fixed steel column, and internal climbing, as needed.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A concrete placing device includes a mobile vehicle body and a connecting base, wherein the mobile vehicle body is provided with wheels; and a placing boom is connected to the connecting base.

[0006] The connecting base is connected to the mobile vehicle body via a connecting assembly; four support seats are fixed on the mobile vehicle body, and each support seat is hinged with a support leg; the connecting base is connected to a connecting frame via a connecting cylinder, and the piston rod of the connecting cylinder is detachably connected to the connecting frame; the connecting frame is provided with a guide groove that connects to each support leg, and each support leg is connected with a guide pin that cooperates with the guide groove.

[0007] Four connecting arms are slidably connected to the connecting base, and a return spring is provided between the connecting arm and the connecting base; each support corresponds to one connecting arm, the connecting arm is provided with a connecting groove, and the support is provided with a corresponding first locking pin; the connecting base is provided with a driving component, which drives each connecting arm to move in opposite directions.

[0008] A support plate is fixedly connected to the mobile vehicle body, and a connecting plate is provided on the connecting base. The connecting plate is supported by the support plate, and the support plate and the connecting plate are positioned by a positioning pin.

[0009] Two connecting components are provided, located on both sides of the support plate respectively; each connecting component includes a limiting plate and a drive telescopic cylinder; the limiting plate is slidably connected to the moving vehicle body, and the two ends of the drive telescopic cylinder are fixedly connected to the limiting plate and the moving vehicle body respectively; the movement of the connecting plate is restricted by the limiting plate.

[0010] A positioning seat is fixedly connected to the limiting plate. The positioning seat is inserted into the connecting frame and has a corresponding slot.

[0011] The drive assembly includes a drive cylinder and a drive cone block, both of which are located inside the connecting base. The two ends of the drive cylinder are fixedly connected to the connecting base and the drive cone block, respectively. The end of the connecting arm is provided with an inclined surface that cooperates with the drive cone block.

[0012] The connecting base is provided with a protective pin assembly; the protective pin assembly includes a protective pin and a protective spring, the protective pin is slidably connected to the connecting base, the protective spring is sleeved outside the protective pin, and the two ends of the protective spring abut against the protective pin and the connecting base respectively; the piston rod of the drive cylinder is provided with a connecting hole that mates with the protective pin, and the front end of the protective pin is chamfered.

[0013] The end of the protective pin is fixedly connected to a pull ring.

[0014] It also includes a connecting column, on which four fixed arms are fixedly connected. Each support base corresponds to one fixed arm, and the connecting arm is provided with a connecting pin. The fixed arm is provided with a first connecting hole that cooperates with the connecting pin and a second locking pin that cooperates with the connecting groove.

[0015] A hanging lug is fixedly connected to the connecting column, and a hanging rod is detachably connected to the piston rod of the connecting cylinder; a hanging ring that cooperates with the hanging lug is hinged to the lower end of the hanging rod.

[0016] The protective pin and the hanging rod are connected by a linkage component. When the piston rod of the connecting rod retracts and causes the hanging rod to move upward, the linkage component causes the protective pin to move away from the connecting hole.

[0017] The linkage assembly includes a linkage pin and a linkage inclined plate. The linkage pin is fixedly connected to the end of the protective pin, and the linkage inclined plate is fixedly connected to the hanging rod. The hanging rod and the piston rod of the connecting rod are connected by a pin.

[0018] Compared with the prior art, the beneficial effects of this invention are:

[0019] By connecting the base, connecting components, and connecting arm, the same set of placing boom and connecting base can be easily connected or separated from the mobile vehicle or fixed frame (such as steel column or internal climbing frame), realizing the conversion between multiple usage modes such as mobile placing boom, steel column placing boom and internal climbing placing boom, significantly improving the utilization rate of the equipment and construction flexibility.

[0020] Initial positioning is achieved using locating pins and pin holes, and the connecting plate is limited by a limit plate controlled by a drive telescopic cylinder. Multiple locking mechanisms are formed through the insertion and engagement of the connecting arm, connecting groove, and the first locking pin on the support base (or the second locking pin on the fixed support arm), ensuring accurate and reliable connection between the connecting base and different load-bearing bodies (mobile vehicle body or fixed frame).

[0021] The connecting frame is raised and lowered by a connecting cylinder, and the L-shaped outriggers are precisely controlled to expand and retract synchronously by using the cooperation of guide grooves and guide pins, thus ensuring the stability of the working support in mobile mode.

[0022] The auxiliary tensioning mechanism, consisting of a connecting cylinder, a hanging rod, and a hanging lug, can further tension and fix the connecting base and the fixed frame after the main body connection is locked, effectively suppressing possible shaking and enhancing the connection rigidity and safety under high load or dynamic operation.

[0023] The protective pin assembly effectively prevents the drive cylinder from accidentally retracting and causing the connection to disengage, while the linkage assembly (linkage pin, linkage ramp) automatically releases the protective pin lock when the fixed mode is removed, avoiding human error and improving the overall system's safety and ease of operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention as a mobile fabric-making device;

[0025] Figure 2 This is a schematic diagram of the connection structure between the mobile vehicle body and the connecting base of the present invention;

[0026] Figure 3 yes Figure 2 A schematic diagram of the structure from another direction shown;

[0027] Figure 4 This is a schematic diagram of the structure of the connecting component of the present invention;

[0028] Figure 5 yes Figure 2 A cross-sectional view of some components of the structure shown;

[0029] Figure 6 yes Figure 2 A partial sectional view of the support leg in the structure shown;

[0030] Figure 7 This is a schematic diagram of the structure of the connecting base of the present invention;

[0031] Figure 8 yes Figure 7 A partial sectional view of the structure shown;

[0032] Figure 9 This is a structural schematic diagram of the present invention when used as a steel column placing machine or an internal climbing placing machine;

[0033] Figure 10 This is a schematic diagram of the connection structure between the connecting base and the connecting column of the present invention;

[0034] Figure 11 yes Figure 10 A magnified view of a section at point A in the middle;

[0035] Figure 12 yes Figure 10 A partial sectional view of the structure shown;

[0036] Figure 13 yes Figure 12 A magnified view of a section at point B in the middle;

[0037] Figure 14 This is a schematic diagram of the driver component;

[0038] Wherein: 1 is the mobile vehicle body, 2 is the connecting base, 3 is the wheel, 4 is the fabric boom, 5 is the connecting assembly, 50 is the limit plate, 51 is the drive telescopic cylinder, 52 is the positioning seat, 520 is the slot, 6 is the support seat, 61 is the first locking pin, 7 is the outrigger, 8 is the connecting frame, 80 is the guide groove, 81 is the guide pin, 9 is the connecting arm, 90 is the connecting pin, 91 is the connecting groove, 10 is the return spring, 11 is the drive assembly, 1 10 is the drive cylinder, 111 is the drive cone block, 12 is the support plate, 13 is the connecting plate, 14 is the positioning pin, 15 is the protective pin assembly, 150 is the protective pin, 151 is the protective spring, 16 is the pull ring, 17 is the connecting column, 18 is the fixed support arm, 180 is the first connecting hole, 181 is the second locking pin, 19 is the hanging ear, 20 is the hanging rod, 21 is the hanging ring, 22 is the linkage pin, 23 is the linkage inclined plate, and 24 is the connecting cylinder. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] like Figures 1 to 14 As shown, a concrete placing boom device includes a mobile vehicle body 1 and a connecting base 2. The mobile vehicle body 1 is equipped with wheels 3. The connecting base 2 is connected to a placing boom 4. The placing boom 4 can adopt a structure from the prior art. Specifically, the placing boom 4 is connected to the connecting base 2 via an electric rotary table.

[0041] The connecting base 2 is connected to the mobile vehicle body 1 through the connecting component 5, which makes it easy to assemble and disassemble the connecting base 2 and the mobile vehicle body 1.

[0042] Four support seats 6 are fixed on the mobile vehicle body 1, and each support seat 6 is hinged with a leg 7; specifically, the middle part of the leg 7 is hinged to the support seat 6, and the leg 7 is in the shape of an "L".

[0043] The connecting base 2 is connected to the connecting frame 8 via the connecting cylinder 24. The piston rod of the connecting cylinder 24 is detachably connected to the connecting frame 8, specifically by a pin connection. There are two connecting cylinders 24, located on both sides of the connecting base 2. The cylinder body of the connecting cylinder 24 is fixedly connected to the connecting base 2.

[0044] The connecting frame 8 is provided with guide grooves 80 that connect to each support leg 7, and each support leg 7 is connected with a guide pin 81 that mates with the guide groove 80. The extension and retraction of the piston rod of the connecting cylinder 24 can drive the connecting frame 8 to move up and down; through the cooperation between the guide groove 80 and the guide pin 81, it can drive each support leg 7 to rotate.

[0045] Four connecting arms 9 are slidably connected to the connecting base 2, and a return spring 10 is provided between the connecting arm 9 and the connecting base 2. Each support seat 6 corresponds to one connecting arm 9, and the connecting arm 9 is provided with a connecting groove 91. The support seat 6 is provided with a corresponding first locking pin 61. The connecting base 2 is provided with a driving assembly 11, which drives each connecting arm 9 to move in opposite directions (the return spring 10 is compressed), so that each connecting arm 9 moves outward until the first locking pin 61 is inserted into the connecting groove 91, which plays a limiting and fixing role.

[0046] When used as a mobile fabric-laying device, the connecting base 2 is connected to the mobile vehicle body 1 via the connecting assembly 5; and the connecting slots 91 are all connected to the corresponding first locking pins 61. The mobile vehicle body 1 is moved to the required work position by traction; after reaching the work position, the piston rod of the connecting cylinder 24 retracts, causing the connecting frame 8 to move upward. Through the cooperation between the guide slot 80 and the guide pin 81, each outrigger 7 rotates downward to contact the ground and provide support, ensuring stability during operation.

[0047] When the operation is completed and the vehicle needs to be moved, the piston rod of the connecting cylinder 24 extends, causing the connecting frame 8 to move downward. Through the cooperation between the guide groove 80 and the guide pin 81, each outrigger 7 rotates upward and disengages from the ground.

[0048] If intended for use as a steel column placing boom or an internal climbing placing boom, first separate the piston rod of the connecting cylinder 24 from the connecting frame 8 (remove the pin); then, disconnect the connecting base 2 from the moving vehicle body 1 by controlling the connecting assembly 5; then, drive the assembly 11 to move, and each connecting arm 9 moves relative to each other (inward) under the action of the return spring 10, separating the connecting groove 91 from the corresponding first locking pin 61. Finally, hoist the connecting base 2 and the placing boom 4 to the frame of the steel column or internal climbing placing boom for modification.

[0049] The above-described structure allows for the installation and disassembly of the connecting base 2 and the mobile vehicle body 1, enabling it to serve multiple purposes.

[0050] Furthermore, a support plate 12 is fixedly connected to the mobile vehicle body 1, and a connecting plate 13 is fixedly connected to the connecting base 2. The supporting plate 12 supports the connecting plate 13, and the supporting plate 12 and the connecting plate 13 are positioned by a positioning pin 14. The positioning pin 14 is fixedly connected to the supporting plate 12, and the connecting plate 13 is provided with corresponding pin holes.

[0051] like Figure 5 As shown, there are two connecting components 5, located on both sides of the support plate 12 respectively; the connecting component 5 includes a limiting insert plate 50 and a drive telescopic cylinder 51; the limiting insert plate 50 is slidably connected to the moving vehicle body 1, and the two ends of the drive telescopic cylinder 51 are fixedly connected to the limiting insert plate 50 and the moving vehicle body 1 respectively; the movement of the connecting plate 13 is restricted by the limiting insert plate 50.

[0052] When connecting the connecting base 2 to the mobile vehicle body 1: First, hoist the connecting base 2 and the fabric boom 4 to the top of the connecting base 2; then lower the connecting base 2 and the fabric boom 4 until the connecting plate 13 contacts the support plate 12 and the positioning pin 14 is inserted into the pin hole; finally, extend the piston rod of the drive telescopic cylinder 51 to move the limiting plate 50 above the connecting plate 13 (the lower surface of the limiting plate 50 contacts the upper surface of the connecting plate 13) to restrict the movement of the connecting plate 13 (see details). Figure 5 (The state shown).

[0053] Furthermore, such as Figure 6 As shown, in order to prevent the connecting frame 8 from moving accidentally, a positioning seat 52 is fixedly connected to the limiting plate 50. The positioning seat 52 is inserted into the connecting frame 8, and a corresponding slot 520 is provided on the positioning seat 52.

[0054] After each outrigger 7 rotates downwards to contact the ground and provide support, the piston rod of the telescopic cylinder 51 continues to extend, causing the positioning seat 52 to engage with the connecting frame 8, thus restricting the movement of the connecting frame 8 (see details). Figure 6 (As shown in the diagram). When the connecting frame 8 needs to move, the piston rod of the telescopic cylinder 51 retracts until the positioning seat 52 separates from the connecting frame 8; at this time, the limiting plate 50 is still located above the connecting plate 13 (back to the state shown). Figure 5 (The state shown).

[0055] Furthermore, the drive assembly 11 includes a drive cylinder 110 and a drive cone 111, both of which are located within the connecting base 2. The two ends of the drive cylinder 110 are fixedly connected to the connecting base 2 and the drive cone 111, respectively. The extension and retraction of the piston rod of the drive cylinder 110 allows the drive cone 111 to move up and down. The end of the connecting arm 9 is provided with an inclined surface that engages with the drive cone 111. When the drive cone 111 moves upward, it engages with the inclined surface of the connecting arm 9, pushing each connecting arm 9 outward. When the drive cone 111 moves downward, the return spring 10 releases its elastic potential energy, causing each connecting arm 9 to move inward.

[0056] Furthermore, a protective pin assembly 15 is provided on the connecting base 2; the function of the protective pin assembly 15 is to restrict the movement of the piston rod of the drive cylinder 110.

[0057] The protective pin assembly 15 includes a protective pin 150 and a protective spring 151. The protective pin 150 is slidably connected to the connecting base 2. The protective spring 151 is sleeved on the protective pin 150, and the two ends of the protective spring 151 abut against the protective pin 150 and the connecting base 2 respectively. The piston rod of the drive cylinder 110 is provided with a connecting hole that mates with the protective pin 150. The front end of the protective pin 150 is chamfered.

[0058] As the piston rod of the drive cylinder 110 extends, the front end of the protective pin 150 contacts the piston rod of the drive cylinder 110. When it moves to the connection hole, the protective spring 151 releases its elastic potential energy to push the protective pin 150 into the connection hole, thereby restricting the movement of the piston rod of the drive cylinder 110. At this time, each of the first locking pins 61 is inserted into the corresponding connection groove 91.

[0059] By setting the protective pin assembly 15, the telescopic rod of the drive cylinder 110 can be prevented from accidentally moving downward, thereby causing the connecting groove 91 to separate from the first locking pin 61. When the piston rod that needs to drive the rod needs to move downward, the protective pin 150 needs to be pulled outward first so that the protective pin 150 moves out of the connecting hole.

[0060] Furthermore, a pull ring 16 is fixedly connected to the end of the protective pin 150. By setting the pull ring 16, the protective pin 150 can be easily pulled to move the protective pin 150 out of the connection hole.

[0061] Furthermore, it also includes a connecting column 17, which represents the frame of the steel profile or internal climbing concrete placing boom; in order to facilitate connection with the frame of the steel profile or internal climbing concrete placing boom, the following structure is also provided:

[0062] Four fixed support arms 18 are fixedly connected to the connecting column 17, with each support base 6 corresponding to one fixed support arm 18. Connecting arms 9 are provided with connecting pins 90, and fixed support arms 18 are provided with first connecting holes 180 that mate with connecting pins 90 and second locking pins 181 that mate with connecting grooves 91. Specifically, a top plate is provided at the top of the connecting column 17, and corresponding pins are fixed on the top plate, which can connect with pin holes on the connecting plate 13 to serve a positioning function.

[0063] When connecting the connecting base 2 and the connecting column 17: first, hoist the connecting base 2 and the fabric boom 4 to the top of the connecting column 17; then lower the connecting base 2 and the fabric boom 4 until the lower surface of the connecting plate 13 contacts the upper surface of the top plate and the pin is connected to the pin hole; finally, extend the piston rod of the drive cylinder 110 to move each connecting arm 9 outward until the connecting pin 90 of each connecting arm 9 is inserted into the corresponding first connecting hole 180 and the second locking pin 181 is inserted into the connecting groove 91, thereby realizing the connection between the connecting base 2 and the connecting column 17.

[0064] Furthermore, a hanging lug 19 is fixedly connected to the connecting column 17, and a hanging rod 20 is detachably connected to the piston rod of the connecting cylinder 24, specifically by a pin connection. The upper end of the hanging rod 20 is provided with a sleeve, which is inserted into the piston rod of the connecting cylinder 24. After insertion, the sleeve and the piston rod are connected by a pin. The lower end of the hanging rod 20 is hinged with a hanging ring 21 that mates with the hanging lug 19.

[0065] Through the above operations, the connecting pins 90 of each connecting arm 9 are inserted into the corresponding first connecting holes 180, and the second locking pins 181 are inserted into the connecting grooves 91. The hanging rod 20 is then connected to the piston rod of the connecting cylinder 24. The piston rod of the connecting cylinder 24 extends, causing the hanging ring 21 to move below the hanging ear 19. The operator pushes the hanging ring 21 into the hanging ear 19, and then controls the piston rod of the connecting cylinder 24 to retract, causing the hanging rod 20 to move upward. The hanging ring 21 hooks the hanging ear 19, further fixing the connecting base 2 and the connecting column 17.

[0066] When it is necessary to separate the connecting base 2 from the connecting column 17, in addition to manually pulling the protective pin 150 to remove it from the connecting hole, the following structure can be provided to replace manual labor and eliminate this step:

[0067] The protective pin 150 is connected to the hanging rod 20 via a linkage assembly. When the connecting base 2 is separated from the connecting column 17, the piston rod of the connecting cylinder 24 extends, causing the hanging ring 21 to no longer hook the hanging ear 19; the hanging ring 21 is manually removed from the hanging ear 19; then the piston rod of the connecting cylinder 24 retracts, causing the hanging rod 20 to move upward, until the linkage assembly drives the protective pin 150 to move away from the connecting hole, causing the protective pin 150 to be removed from the connecting hole.

[0068] Furthermore, the linkage assembly includes a linkage pin 22 and a linkage inclined plate 23. The linkage pin 22 is fixedly connected to the end of the protective pin 150, and the linkage inclined plate 23 is fixedly connected to the hanging rod 20. The hanging rod 20 is connected to the piston rod of the connecting rod by a pin.

[0069] When the hanging rod 20 moves upward, the inclined surface on the linkage inclined plate 23 will gradually come into contact with the linkage pin 22, causing the protective pin 150 to move away from the connection hole.

[0070] The above description only illustrates preferred embodiments of the present invention, but the present invention is not limited to the above embodiments.

Claims

1. A concrete placing device, characterized in that: It includes a mobile vehicle body (1) and a connecting base (2), wherein the mobile vehicle body (1) is provided with wheels (3); and the connecting base (2) is connected to a fabric boom (4). The connecting base (2) is connected to the mobile vehicle body (1) through the connecting assembly (5); four support seats (6) are fixed on the mobile vehicle body (1), and each support seat (6) is hinged with a support leg (7); the connecting base (2) is connected to the connecting frame (8) through the connecting cylinder (24), and the piston rod of the connecting cylinder (24) is detachably connected to the connecting frame (8); the connecting frame (8) is provided with a guide groove (80) that connects to each support leg (7), and each support leg (7) is connected with a guide pin (81) that cooperates with the guide groove (80); Four connecting arms (9) are slidably connected to the connecting base (2), and a return spring (10) is provided between the connecting arm (9) and the connecting base (2); each support seat (6) corresponds to one connecting arm (9), the connecting arm (9) is provided with a connecting groove (91), and the support seat (6) is provided with a corresponding first locking pin (61); the connecting base (2) is provided with a driving assembly (11), which drives each connecting arm (9) to move in opposite directions; The drive assembly (11) includes a drive cylinder (110) and a drive cone (111). Both the drive cylinder (110) and the drive cone (111) are located inside the connecting base (2). The two ends of the drive cylinder (110) are fixedly connected to the connecting base (2) and the drive cone (111) respectively. The end of the connecting arm (9) is provided with an inclined surface that cooperates with the drive cone (111). The connecting base (2) is provided with a protective pin assembly (15); the protective pin assembly (15) includes a protective pin (150) and a protective spring (151). The protective pin (150) is slidably connected to the connecting base (2), and the protective spring (151) is sleeved on the protective pin (150). The two ends of the protective spring (151) abut against the protective pin (150) and the connecting base (2) respectively. The piston rod of the drive cylinder (110) is provided with a connecting hole that cooperates with the protective pin (150), and the front end of the protective pin (150) is provided with a chamfer. It also includes a connecting column (17), on which four fixed arms (18) are fixedly connected. Each support base (6) corresponds to one fixed arm (18). A connecting pin (90) is provided on the connecting arm (9). The fixed arm (18) is provided with a first connecting hole (180) that cooperates with the connecting pin (90) and a second locking pin (181) that cooperates with the connecting groove (91).

2. The concrete placing device according to claim 1, characterized in that: A support plate (12) is fixedly connected to the mobile vehicle body (1), and a connecting plate (13) is provided on the connecting base (2). The connecting plate (13) is supported by the support plate (12), and the support plate (12) and the connecting plate (13) are positioned by a positioning pin (14). Two connecting components (5) are provided, located on both sides of the support plate (12); the connecting component (5) includes a limiting insert plate (50) and a drive telescopic cylinder (51); the limiting insert plate (50) is slidably connected to the moving vehicle body (1), and the two ends of the drive telescopic cylinder (51) are fixedly connected to the limiting insert plate (50) and the moving vehicle body (1) respectively; the movement of the connecting plate (13) is restricted by the limiting insert plate (50).

3. A concrete placing device according to claim 2, characterized in that: The limiting plate (50) is fixedly connected to a positioning seat (52), which is inserted into the connecting frame (8). The positioning seat (52) is provided with a corresponding slot (520).

4. A concrete placing device according to claim 1, characterized in that: The end of the protective pin (150) is fixedly connected to a pull ring (16).

5. A concrete placing device according to claim 1, characterized in that: The connecting column (17) is fixedly connected to a hanging ear (19), and the piston rod of the connecting cylinder (24) is detachably connected to a hanging rod (20); the lower end of the hanging rod (20) is hinged to a hanging ring (21) that cooperates with the hanging ear (19).

6. A concrete placing device according to claim 5, characterized in that: The protective pin (150) and the hanging rod (20) are connected by a linkage component. When the piston rod of the connecting rod retracts and drives the hanging rod (20) to move upward, the protective pin (150) is driven to move away from the connecting hole through the linkage component.

7. A concrete placing device according to claim 6, characterized in that: The linkage assembly includes a linkage pin (22) and a linkage inclined plate (23). The linkage pin (22) is fixedly connected to the end of the protective pin (150), and the linkage inclined plate (23) is fixedly connected to the hanging rod (20). The hanging rod (20) is connected to the piston rod of the connecting rod by a pin.

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