A stable base for transporting precast bridge piers

Abstract

This invention relates to the field of bridge precast pier transportation technology, and more specifically discloses a stable base for transporting bridge precast piers, including a support platform, a fixed platform on the top of the support platform, a side fixing adjustment device inside the support platform, end face fixing adjustment devices at both ends of the support platform, and a control device on the end face fixing adjustment device. The support platform has a first fixing groove and a second fixing groove located on both sides of the fixed platform. A first through hole is opened on one side of the support platform, and a rotating groove is provided on the side of the first fixing groove away from the second fixing groove. This invention, by providing a side fixing adjustment device, facilitates the adjustment of the first and second sliders according to the position of the precast bridge pier, ensuring that when fixing the side of any shape of precast bridge pier, the chain is completely fitted with the side of the precast bridge pier without any gaps.

Description

Technical Field

[0001] This invention relates to the field of bridge precast pier transportation technology, and more specifically to a stable base for transporting bridge precast piers. Background Technology

[0002] Bridge piers are load-bearing structures in civil engineering used to support the superstructure. They are a crucial component of bridges and have a profound impact on the overall stability of the bridge. Pier cross-sections are mostly circular, but elliptical, square, curved, parabolic, and other irregular shapes also exist. Piers are an important part of highway bridges, railway bridges, pedestrian bridges, overpasses, ramp bridges, and pedestrian bridges.

[0003] Chinese patent application CN202420691694.7 discloses a stable base for transporting precast bridge piers. Addressing the problems of difficult disassembly of connecting parts after transport and inconvenience in firmly clamping curved piers, the following solution is proposed: a support base, a clamping plate, and a clamping fixing seat. This invention features a fixed long rack on the support base and a movable short rack movably installed inside the sliding base. When the movable short rack and the fixed long rack are engaged together, the position of the sliding base is fixed, preventing it from moving outwards without the need for bolts or other fasteners. A clamping abutment is movably inserted into the abutment movable cavity. Hydraulic oil is filled in both the reservoir and the abutment movable cavity. The abutment is adjusted according to the shape of the pier surface, allowing for better abutment against the curved pier surface, increasing the clamping force point, and enabling stable transport of piers of different shapes.

[0004] The above technical solution has the following drawbacks: The upper surface of the pier support block in this patent is flat. When fixing the circular precast bridge pier, there is a large gap between the circular precast bridge pier, especially the bottom area, and the clamping plate and pier support block. This makes it difficult for the clamping rods on both sides to fit completely against the surface of the precast bridge pier, which can easily cause shaking during transportation. In addition, this patent only fixes the precast bridge pier by clamping rods on the sides. However, during transportation, when an emergency braking is required, the lack of fixation at both ends of the precast bridge pier will cause the precast bridge pier to move back and forth on the pier support block due to inertia. This will cause the fixation to loosen and the clamping rods to slide on the surface of the precast bridge pier, resulting in damage to the precast bridge pier and economic losses. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a stable base for transporting precast bridge piers, so as to solve the problems existing in the background art.

[0006] The present invention provides the following technical solution: a stable base for transporting precast bridge piers, including a support platform, a fixed platform on the top of the support platform, a side fixing adjustment device inside the support platform, end face fixing adjustment devices at both ends of the support platform, and a control device on the end face fixing adjustment device.

[0007] Furthermore, the support platform is provided with a first fixing groove and a second fixing groove, which are located on both sides of the fixing platform. A first through hole is provided on one side of the support platform, and a rotating groove is provided on the side of the first fixing groove away from the second fixing groove.

[0008] Furthermore, the fixed platform includes a platform body, on which an arc-shaped groove is provided, and a platform area is formed between the top of the arc-shaped groove and the upper surface of the platform body.

[0009] Furthermore, the side-fixing adjustment device includes a first slider, a second slider, an adjustment knob, and a chain. The adjustment knob is fixedly connected to a rotating shaft, which is provided with a first thread and a second thread. The first thread and the rotating shaft are respectively located in a second fixing groove and a first fixing groove. The first slider has a first threaded groove on its side, which is threadedly connected to the first thread. The second slider has a second threaded groove on its side, which is threadedly connected to the second thread. The tops of the first slider and the second slider are detachably connected to a chain. The adjustment knob is electrically connected to the control device.

[0010] Furthermore, a first buckle is fixedly connected to one end of the chain near the first slider, a first groove is provided on the top of the first slider, a first locking shaft is fixedly connected inside the first groove, and the first buckle and the first locking shaft are detachably connected. A second buckle is fixedly connected to one end of the chain near the second slider, a second groove is provided on the top of the second slider, a second locking shaft is fixedly connected inside the second groove, and the second buckle and the second locking shaft are detachably connected.

[0011] Furthermore, the chain is provided with a plurality of first buffer devices, each first buffer device including a connecting ring and a first elastic buffer member. The connecting ring is fixedly connected to the chain, and the first elastic buffer member is fixedly connected to the first elastic buffer member. The first elastic buffer member is located on the inner side of the chain and is arc-shaped.

[0012] Furthermore, the end face fixing adjustment device includes a fixing plate, a first electric telescopic rod is provided on the side of the fixing plate near the fixing platform, the other end of the first electric telescopic rod is fixedly connected to the moving plate, three third grooves are provided on the side of the moving plate near the fixing platform, and a fixing adjustment component is provided inside the third grooves. The first electric telescopic rod is electrically connected to the control device.

[0013] Furthermore, the fixed adjustment assembly includes a mounting platform, on which three second electric telescopic rods are fixedly connected. An adjustment block is fixedly connected to the other end of each second electric telescopic rod. A fixed shaft is fixedly connected to the side of the adjustment block near the fixed platform. The other end of the fixed shaft is fixedly connected to a second elastic buffer member, which is arc-shaped.

[0014] The technical effects and advantages of this invention are as follows:

[0015] 1. The present invention, by providing a side fixing adjustment device, facilitates the adjustment of the first and second sliders according to the position of the precast bridge pier, ensuring that when fixing the side of any shape of precast bridge pier, the chain is completely fitted with the side of the precast bridge pier without leaving any gaps.

[0016] 2. The present invention, by providing an end-face fixing adjustment device, facilitates the fixing of both ends of the precast bridge pier, and avoids the precast bridge pier moving back and forth under the action of inertia during emergency braking, which would cause the fixing to loosen and the side fixing adjustment device 3 to slide on the surface of the precast bridge pier, resulting in damage to the precast bridge pier and economic losses.

[0017] 3. By incorporating a first elastic buffer and a second elastic buffer, the present invention facilitates the fixation of precast bridge piers while buffering minor swaying during transportation, thereby offsetting stress and extending the service life of the device.

[0018] 4. The present invention, by providing a fixing platform, facilitates the fixing of circular precast bridge piers by suspending their bottom arc-shaped area in the arc-shaped groove so that their bottom fits against the platform. When fixing square precast bridge piers, the bottom arc-shaped area is suspended within the platform area so that their bottom fits against the platform area, further enhancing stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the support platform and fixed platform structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the side fixing and adjusting device of the present invention;

[0022] Figure 4 This is a schematic diagram of the first and second latch structures of the present invention;

[0023] Figure 5 This is a schematic diagram of the end face fixing and adjusting device of the present invention;

[0024] Figure 6 This is a schematic diagram of the fixed adjustment component structure of the present invention.

[0025] The attached figures are labeled as follows: 1. Support platform; 101. First fixing groove; 102. Second fixing groove; 103. First through hole; 104. Rotating groove; 2. Fixing platform; 201. Platform body; 202. Arc-shaped groove; 203. Platform area; 3. Side fixing adjustment device; 301. First slider; 3011. First threaded groove; 3012. First groove; 3013. First locking shaft; 302. Second slider; 3021. Second threaded groove; 3022. Second groove; 3023. Second locking shaft; 303. Adjustment knob; 3031. Rotating shaft; 3032. 1. Thread 1; 3033. Thread 2; 304. Chain; 3041. First latch; 3042. Second latch; 305. First buffer device; 3051. Connecting ring; 3052. First elastic buffer; 4. End face fixing adjustment device; 401. Fixing plate; 402. First electric telescopic rod; 403. Moving plate; 4031. Third groove; 404. Fixing adjustment assembly; 4041. Mounting platform; 4042. Second electric telescopic rod; 4043. Adjusting block; 4044. Fixing shaft; 4045. Second elastic buffer; 5. Control device. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The stable base for transporting precast bridge piers involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Reference Figure 1 The present invention provides a stable base for transporting precast bridge piers, including a support platform 1, a fixed platform 2 on the top of the support platform 1, a side fixing adjustment device 3 inside the support platform 1, and end face fixing adjustment devices 4 at both ends of the support platform 1, with a control device 5 on the end face fixing adjustment device 4.

[0028] In this embodiment, it should be specifically explained that: the precast bridge pier is hoisted onto the arc-shaped groove 202, the bottom of the arc-shaped precast bridge pier is placed inside the arc-shaped groove 202, and the bottom of the square precast bridge pier is placed on the platform area 203. The fixed angle is adjusted by moving the first slider 301 and the second slider 302. Then, the chain 304 is wrapped around the precast bridge pier and the two ends of the chain 304 are locked on the first slider 301 and the second slider 302 to complete the fitting and fixing of the precast bridge pier. Then, the first electric telescopic rod 402 is operated to fit the two ends of the precast bridge pier with the moving plate 403. Then, the second elastic buffer 4045 is controlled to fit with the sides of the two ends of the precast bridge pier to complete the fixing of the two ends of the precast bridge pier.

[0029] The main difference between this embodiment and the prior art is that this embodiment uses a fixed platform 2, a side fixing adjustment device 3, and an end fixing adjustment device 4. The platform of the fixed platform 2 can be fitted with bridge precast piers of different shapes. By adjusting the position of the first slider 301 and the second slider 302, when the chain 304 passes around the bridge precast pier for fixing, the chain 304 and the bridge precast pier always remain in contact, avoiding gaps that could cause shaking during transportation. The moving plate 403 is fitted with both ends of the bridge precast pier, and the second elastic buffer 4045 is fitted with the sides of both ends of the bridge precast pier to ensure that the bridge precast pier does not move back and forth. Specifically, the first slider 301, the second slider 302, the chain 304, the moving plate 403, and the fixing adjustment assembly 404 are used.

[0030] The above structure is the main structure of this embodiment. It solves the problem that when fixing a circular precast bridge pier, especially the bottom area, there is a large gap between the circular precast bridge pier and the clamping plate and pier support block because the upper surface of the pier support block is flat. This makes it difficult for the clamping rods on both sides to fit well against the surface of the precast bridge pier, which can easily cause shaking during transportation. In addition, fixing the precast bridge pier only with the side clamping rods is not feasible during transportation. In case of emergency braking, the lack of fixing at both ends of the precast bridge pier will cause the precast bridge pier to move back and forth on the pier support block due to inertia. This will cause the fixing to loosen and the clamping rods to slide on the surface of the precast bridge pier, resulting in damage to the precast bridge pier and economic losses. The first latch 3041 and the second latch 3042 are existing structures. The specific structure and connection method of the first latch 3041 and the second latch 3042 will not be described in detail in this embodiment.

[0031] Reference Figure 2The support platform 1 is provided with a first fixing groove 101 and a second fixing groove 102. The first fixing groove 101 and the second fixing groove 102 are located on both sides of the fixing platform 2. A first through hole 103 is provided on one side of the support platform 1. A rotating groove 104 is provided on the side of the first fixing groove 101 away from the second fixing groove 102.

[0032] In this embodiment, it should be specifically explained that: the rotating shaft 3031 enters the first fixed groove 101 and the second fixed groove 102 through the first through hole 103, and the end of the rotating shaft 3031 rotates in the rotating groove 104.

[0033] Reference Figure 2 The fixed platform 2 includes a platform body 201, on which an arc-shaped groove 202 is provided, and a platform area 203 is formed between the top of the arc-shaped groove 202 and the upper surface of the platform body 201.

[0034] In this embodiment, it should be specifically explained that when the precast bridge pier is hoisted onto the fixed platform 2, for a circular precast bridge pier, its bottom arc-shaped area is hoisted into the arc-shaped groove 202 so that its bottom is in contact with the platform body 201; for a square precast bridge pier, its bottom arc-shaped area is hoisted into the platform area 203 so that its bottom is in contact with the platform area 203, thereby enhancing stability.

[0035] Reference Figure 3 The side-fixed adjustment device 3 includes a first slider 301, a second slider 302, an adjustment knob 303, and a chain 304. The adjustment knob 303 is fixedly connected to a rotating shaft 3031. The rotating shaft 3031 is provided with a first thread 3032 and a second thread 3033. The first thread 3032 and the rotating shaft 3031 are respectively located in the second fixing groove 102 and the first fixing groove 101. The first slider 301 has a first threaded groove 3011 on its side, which is threadedly connected to the first thread 3032. The second slider 302 has a second threaded groove 3021 on its side, which is threadedly connected to the second thread 3033. The first slider 301 and the second slider 302 are detachably connected to the top of the chain 304. The adjustment knob 303 is electrically connected to the control device 5.

[0036] In this embodiment, it should be specifically explained that: before fixing the side of the precast bridge pier, the first slider 301 and the second slider 302 are adjusted according to the position of the precast bridge pier. The adjustment knob 303 is rotated by the control device 5. Due to the threaded connection between the first threaded groove 3011 and the first threaded groove 3032 and the second threaded groove 3021 and the second threaded groove 3033, the first slider 301 and the second slider 302 are moved on the rotating shaft 3031. For the circular precast bridge pier, the first slider 301 and the second slider 302 are adjusted to the bottom of the circular precast bridge pier so that when the chain 304 is fixed to it, the chain 304 and the circular precast bridge pier, especially the bottom area, are completely fitted without gaps. For the square precast bridge pier, the first slider 301 and the second slider 302 are adjusted to the position below the side of the square precast bridge pier so that the chain 304 and the side and top surface of the square precast bridge pier are completely fitted.

[0037] Reference Figure 4 A first buckle 3041 is fixedly connected to one end of the chain 304 near the first slider 301. A first groove 3012 is provided on the top of the first slider 301. A first locking shaft 3013 is fixedly connected inside the first groove 3012. The first buckle 3041 and the first locking shaft 3013 are detachably connected. A second buckle 3042 is fixedly connected to one end of the chain 304 near the second slider 302. A second groove 3022 is provided on the top of the second slider 302. A second locking shaft 3023 is fixedly connected inside the second groove 3022. The second buckle 3042 and the second locking shaft 3023 are detachably connected.

[0038] In this embodiment, it should be specifically explained that after the positions of the first slider 301 and the second slider 302 are adjusted, the first latch 3041 is first locked on the first locking shaft 3013, then the chain 304 is passed around the surface of the precast bridge pier to the other side, and then the second latch 3042 is locked on the second locking shaft 3023 to complete the fixation of the side of the precast bridge pier.

[0039] Reference Figure 3 The chain 304 is provided with a plurality of first buffer devices 305. Each first buffer device 305 includes a connecting ring 3051 and a first elastic buffer 3052. The connecting ring 3051 is fixedly connected to the chain 304 and the first elastic buffer 3052 is fixedly connected to the first elastic buffer 3052. The first elastic buffer 3052 is located inside the chain 304 and is arc-shaped.

[0040] In this embodiment, it should be specifically explained that when fixing the side of the precast bridge pier, the first buffer device 305 on the chain 304 contacts the side of the precast bridge pier, which not only fixes the precast bridge pier but also buffers the slight shaking during transportation, offsets stress, and extends the working life of the device. The first elastic buffer 3052 is arc-shaped and elastic, and can adapt to different precast bridge piers.

[0041] Reference Figure 5 The end face fixing adjustment device 4 includes a fixing plate 401. A first electric telescopic rod 402 is provided on the side of the fixing plate 401 near the fixing platform 2. The other end of the first electric telescopic rod 402 is fixedly connected to the moving plate 403. Three third grooves 4031 are provided on the side of the moving plate 403 near the fixing platform 2. A fixing adjustment component 404 is provided inside the third groove 4031. The first electric telescopic rod 402 is electrically connected to the control device 5.

[0042] In this embodiment, it should be specifically explained that when fixing both ends of the precast bridge pier, the first electric telescopic rod 402 is extended by the control device 5 until the moving plate 403 contacts the end face of the precast bridge pier. This is to prevent the precast bridge pier from moving back and forth under inertia during emergency braking, which would cause the fixing to loosen and the side fixing adjustment device 3 to slide on the surface of the precast bridge pier, resulting in damage to the precast bridge pier and economic losses.

[0043] Reference Figure 6 The fixed adjustment assembly 404 includes a mounting platform 4041, three second electric telescopic rods 4042 are fixedly connected to the mounting platform 4041, the other end of the second electric telescopic rods 4042 is fixedly connected to an adjustment block 4043, a fixed shaft 4044 is fixedly connected to the side of the adjustment block 4043 near the fixed platform 2, and the other end of the fixed shaft 4044 is fixedly connected to a second elastic buffer 4045, which is arc-shaped.

[0044] In this embodiment, it should be specifically explained that the second electric telescopic rod 4042 is controlled by the control device 5 to retract until the second elastic buffer 4045 contacts the side of the end face of the precast bridge pier, thereby completing the fixation of both ends of the precast bridge pier.

[0045] Working principle of the invention:

[0046] The main problem addressed in this embodiment is that the upper surface of the pier support block is flat. When fixing circular precast bridge piers, there is a large gap between the circular precast bridge pier, especially the bottom area, and the clamping plate and pier support block. This makes it difficult for the clamping rods on both sides to fit properly against the surface of the precast bridge pier, which can easily cause shaking during transportation. In addition, fixing the precast bridge pier only with the side clamping rods is not feasible during transportation. In case of emergency braking, the lack of fixing at both ends of the precast bridge pier will cause the precast bridge pier to move back and forth on the pier support block due to inertia. This will cause the fixing to loosen and the clamping rods to slide on the surface of the precast bridge pier, resulting in damage to the precast bridge pier and economic losses.

[0047] The specific steps are as follows:

[0048] During the hoisting stage: When hoisting the precast bridge piers onto the fixed platform 2, for circular precast bridge piers, the bottom arc-shaped area is hoisted into the arc-shaped groove 202 so that the bottom is in contact with the platform 201. For square precast bridge piers, the bottom arc-shaped area is hoisted into the platform area 203 so that the bottom is in contact with the platform area 203 to enhance stability.

[0049] Side fixing stage: Before fixing the side of the precast bridge pier, the first slider 301 and the second slider 302 are adjusted according to the position of the precast bridge pier. The adjustment knob 303 is rotated by the control device 5. Due to the threaded connection between the first threaded groove 3011 and thread one 3032 and the threaded connection between the second threaded groove 3021 and thread two 3033, the first slider 301 and the second slider 302 are moved on the rotating shaft 3031. For circular precast bridge piers, the first slider 301 and the second slider 302 are adjusted to the bottom of the circular precast bridge pier to facilitate subsequent fixing by the chain 304. The chain 304 fits completely against the circular precast bridge pier, especially the bottom area, without leaving any gaps. For the square precast bridge pier, the first slider 301 and the second slider 302 are adjusted to be below the side of the square precast bridge pier, so that the chain 304 fits completely against the side and top surface of the square precast bridge pier. After the positions of the first slider 301 and the second slider 302 are adjusted, the first latch 3041 is locked on the first locking shaft 3013, and then the chain 304 is wrapped around the surface of the precast bridge pier to the other side. Then the second latch 3042 is locked on the second locking shaft 3023 to complete the fixation of the side of the precast bridge pier.

[0050] End face fixing stage: When fixing both ends of the precast bridge pier, the first electric telescopic rod 402 is extended by the control device 5 until the moving plate 403 contacts the end face of the precast bridge pier. Then, the second electric telescopic rod 4042 is retracted by the control device 5 until the second elastic buffer 4045 contacts the side of the end face of the precast bridge pier. This completes the fixing of both ends of the precast bridge pier. This prevents the precast bridge pier from moving back and forth under inertia during emergency braking, which would cause the fixing to loosen and the side fixing adjustment device 3 to slide on the surface of the precast bridge pier, resulting in damage to the precast bridge pier and economic losses.

[0051] Secondly, it also solved the problem of damage to the device caused by stress generated between the precast bridge pier and the fixing device due to slight shaking during the transportation of precast bridge piers.

[0052] When fixing the side of the precast bridge pier, the first buffer device 305 on the chain 304 contacts the side of the precast bridge pier, which not only fixes the precast bridge pier but also buffers the slight shaking during transportation, offsets stress, and extends the working life of the device. The first elastic buffer 3052 is arc-shaped and elastic, which can adapt to different precast bridge piers. When fixing both ends of the precast bridge pier, the second elastic buffer 4045 on the fixing adjustment assembly 404 has the same effect.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stable base for transporting precast bridge piers, comprising a support platform (1), characterized in that: The support platform (1) is provided with a fixed platform (2) on top, and a side fixing adjustment device (3) is provided inside the support platform (1). The support platform (1) is provided with end face fixing adjustment devices (4) at both ends, and a control device (5) is provided on the end face fixing adjustment device (4). The side-fixing adjustment device (3) includes a first slider (301), a second slider (302), an adjustment knob (303), and a chain (304). The adjustment knob (303) is fixedly connected to a rotating shaft (3031). The rotating shaft (3031) is provided with a first thread (3032) and a second thread (3033). The first thread (3032) and the rotating shaft (3031) are respectively located in the second fixing groove (102) and the first fixing groove (101). The first slider (301) A first threaded groove (3011) is provided on the side, and the first threaded groove (3011) is threadedly connected to thread one (3032). A second threaded groove (3021) is provided on the side of the second slider (302), and the second threaded groove (3021) is threadedly connected to thread two (3033). A chain (304) is detachably connected to the top of the first slider (301) and the second slider (302). The adjustment knob (303) is electrically connected to the control device (5). The chain (304) is fixedly connected to a first buckle (3041) at one end near the first slider (301). The first slider (301) has a first groove (3012) at its top. A first locking shaft (3013) is fixedly connected inside the first groove (3012). The first buckle (3041) and the first locking shaft (3013) are detachably connected. The chain (304) is fixedly connected to a second buckle (3042) at one end near the second slider (302). The second slider (302) has a second groove (3022) at its top. A second locking shaft (3023) is fixedly connected inside the second groove (3022). The second buckle (3042) and the second locking shaft (3023) are detachably connected.

2. The stable base for transporting precast bridge piers according to claim 1, characterized in that: The support platform (1) is provided with a first fixing groove (101) and a second fixing groove (102). The first fixing groove (101) and the second fixing groove (102) are located on both sides of the fixing platform (2). A first through hole (103) is provided on one side of the support platform (1). A rotating groove (104) is provided on the side of the first fixing groove (101) away from the second fixing groove (102).

3. A stable base for transporting precast bridge piers according to claim 1, characterized in that: The fixed platform (2) includes a platform body (201), and an arc-shaped groove (202) is provided on the platform body (201). The top of the arc-shaped groove (202) and the upper surface of the platform body (201) form a platform area (203).

4. A stable base for transporting precast bridge piers according to claim 1, characterized in that: The chain (304) is provided with a plurality of first buffer devices (305). Each first buffer device (305) includes a connecting ring (3051) and a first elastic buffer (3052). The connecting ring (3051) is fixedly connected to the chain (304), and the first elastic buffer (3052) is fixedly connected to the first elastic buffer (3052). The first elastic buffer (3052) is located inside the chain (304) and is arc-shaped.

5. A stable base for transporting precast bridge piers according to claim 1, characterized in that: The end face fixing adjustment device (4) includes a fixing plate (401). A first electric telescopic rod (402) is provided on the side of the fixing plate (401) near the fixing platform (2). The other end of the first electric telescopic rod (402) is fixedly connected to the moving plate (403). Three third grooves (4031) are provided on the side of the moving plate (403) near the fixing platform (2). A fixing adjustment component (404) is provided inside the third groove (4031). The first electric telescopic rod (402) is electrically connected to the control device (5).

6. A stable base for transporting precast bridge piers according to claim 5, characterized in that: The fixed adjustment assembly (404) includes a mounting platform (4041), on which three second electric telescopic rods (4042) are fixedly connected. The other end of the second electric telescopic rods (4042) is fixedly connected to an adjustment block (4043). A fixed shaft (4044) is fixedly connected to the side of the adjustment block (4043) near the fixed platform (2). The other end of the fixed shaft (4044) is fixedly connected to a second elastic buffer (4045), which is arc-shaped.

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