Advertisement shooting equipment convenient to adjust

Abstract

The utility model relates to the technical field of camera supports, in particular to advertisement shooting equipment convenient to adjust, the bottom of an outer vertical rod is in threaded connection with a through hole in the top of a supporting seat, and the outer vertical rod is in sliding connection with an inner sleeve rod through limiting grooves formed in the two sides of the inner wall of the outer vertical rod; and the inner sleeve rod is rotationally connected with a horizontal steering seat through a damping rotating shaft arranged at the top of the inner sleeve rod. According to the improved multifunctional stable support, a pressing ring is pressed inwards by a single hand at the same time, so that a limiting block can slide out of a circular through hole of an outer vertical rod, locking of an inner sleeve rod is relieved, the inner sleeve rod slides up and down to adjust the height, then the pressing ring is loosened, and the limiting block is reset and locked through a spring; according to the camera fixing frame, through cooperation of the gear, the rack, the first adjusting plate and the second adjusting plate, horizontal angle adjustment and pitching angle adjustment can be matched with each other according to width and thickness specifications of different cameras, so that the cameras can be flexibly adjusted in different directions, and diversified shooting requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of camera bracket technology, specifically to an easily adjustable advertising shooting device. Background Technology

[0002] A camera stand is a device used to support and fix a camera. Its main function is to maintain the stability of the camera during shooting, prevent shaking caused by holding the camera by hand from affecting the shooting effect, and also allow adjustment of parameters such as the position, angle and height of the camera according to shooting needs.

[0003] Camera mounts typically consist of several parts, including a support structure, connecting components, and adjustment mechanisms, used to adjust the camera's height, orientation, and angle.

[0004] In the process of realizing this utility model, the inventors discovered the following problems with the existing technology: 1. Most existing camera brackets use tripods, which cannot be operated with one hand when adjusting the height. Both hands are required to perform complex operation steps, making it difficult to quickly adjust the bracket to the appropriate height in scenarios such as advertising shooting where equipment needs to be adjusted quickly, thus reducing work efficiency; 2. Most structures used to fix cameras only consider the specifications of a single area of ​​the camera, and cannot fit and fix the camera from multiple directions. The camera is prone to shaking or displacement during shooting, resulting in poor stability and reliability. Furthermore, they are not adaptable to different camera specifications and cannot meet diverse shooting needs. Utility Model Content

[0005] The purpose of this utility model is to provide an easily adjustable advertising shooting device to solve the problems mentioned in the background art, such as the inability to operate with one hand when adjusting the height, requiring complex operation steps with both hands, and the inability to fit and fix the camera from multiple directions. To achieve the above objective, this utility model provides the following technical solution: an easily adjustable advertising shooting device, including a support base and an outer pole. The bottom of the outer pole is threadedly connected to a through hole at the top of the support base. An inner sleeve rod is slidably connected to the outer pole through limiting grooves on both sides of its inner wall. A horizontal steering seat is rotatably connected to the inner sleeve rod through a damping shaft at its top. A camera mounting bracket is rotatably connected above the horizontal steering seat. A worm and a worm wheel are rotatably connected inside the horizontal steering seat. The worm is located below and meshes with the worm wheel. Limiting blocks are movably connected to both ends of the outer wall of the inner sleeve rod near the bottom. Pressure rings are movably connected to both ends of the outer wall of the inner sleeve rod near the top.

[0006] A gear is rotatably connected to one side of the outer wall of the camera mount. A rack is meshed with both the top and bottom of the gear. A first adjustment plate is provided on one side of the outer wall of the camera mount. The first adjustment plate is fixedly connected to one end of the rack, and the other end of the rack is slidably connected to a groove opened on the surface of the camera mount via a slider. A second adjustment plate is slidably connected to one side of the first adjustment plate via a slider.

[0007] More preferably, the outer wall of the support base is rotatably connected to the diagonal bracing in a 120° equiangular distribution, and the end of the diagonal bracing adjacent to the support base is higher and the other end is lower, forming a slope, and the bottom of the diagonal bracing has an arched surface, and the part of the bottom of the diagonal bracing that is in contact with the ground is made of rubber.

[0008] More preferably, the inner wall of the outer upright has several circular through holes at equal intervals on both sides for inserting and connecting the limiting blocks. The limiting blocks and the pressure ring are symmetrically distributed along the axis of the inner sleeve rod. The limiting blocks and the pressure ring are connected as one unit by L-shaped brackets. The bottom of the two L-shaped brackets are slidably connected to the corresponding grooves on the inner wall of the inner sleeve rod by sliders. At the same time, springs are fixedly connected to the L-shaped brackets at both ends on the inner wall of the cavity of the inner sleeve rod. The limiting blocks, through the springs and the pressure ring above, form a sliding telescopic structure in the corresponding grooves on both sides of the inner sleeve rod.

[0009] More preferably, one end of the shaft at the worm gear shaft center is rotatably connected to the inner wall of the horizontal steering seat, and the other end is fixedly connected to the corresponding side of the bottom of the camera mounting bracket.

[0010] More preferably, a handle is fixedly connected to one side of the outer wall of the horizontal steering seat, and the camera mounting bracket rotates horizontally at 180° above the inner sleeve rod via a damping pivot above the horizontal steering seat and the inner sleeve rod.

[0011] More preferably, one end of the rack with the slider is movably connected to the inner wall of the camera mount groove via a spring, and the racks move relative to each other via gears. The first adjusting plates are symmetrically distributed about the vertical center line of the camera mount, and the first adjusting plates form an opening and closing structure via the racks.

[0012] More preferably, the second adjusting plate is perpendicular to one side of the first adjusting plate and parallel to the other side of the first adjusting plate, and a spring is fixedly connected in the groove of the first adjusting plate for sliding the second adjusting plate, and the other end of the spring is fixedly connected to a slider on one side of the second adjusting plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] In this invention, the user can press the pressure rings near the top of the outer wall of the inner sleeve rod with one hand to make the limiting block slide out of the circular through hole of the outer upright rod, thereby releasing the lock on the inner sleeve rod and easily allowing the inner sleeve rod to slide up and down to adjust the height. After adjustment, the pressure rings are released, and the limiting block can automatically reset and lock by the spring. The whole process is simple to operate and greatly improves the efficiency of quickly adjusting the height of the equipment in advertising shooting and other scenarios. The shooting personnel can quickly adjust the bracket to the appropriate height to capture the best picture.

[0015] In this invention, the camera mount, through the cooperation of gears, racks, a first adjusting plate, and a second adjusting plate, can flexibly adjust the positions of the first and second adjusting plates according to the width and thickness specifications of different cameras, achieving stable fixation for cameras of different sizes. The spring not only provides a buffer during the adjustment process but also provides a stable clamping force after the camera is fixed, ensuring that the camera will not easily shake or shift during shooting, thus improving the stability and reliability of the camera fixation. At the same time, it enhances the versatility of the mount for different cameras. The handle fixedly connected to one side of the horizontal steering seat provides a convenient point of leverage for the operator. In actual shooting, the operator can easily grasp the handle to rotate the horizontal steering seat, driving the camera mount and camera to rotate 180° horizontally. The damping shaft provides a certain damping force during the rotation process, effectively preventing the camera mount from being too flexible or shaking randomly during rotation. Through the meshing transmission of the worm gear and worm wheel, the tilt angle of the camera mount can be precisely adjusted. The horizontal angle adjustment and the tilt angle adjustment work together to allow the camera to be flexibly adjusted in different directions, meeting diverse shooting needs and improving the multifunctionality and practicality of the camera mount. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the support structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the outer support pole of this utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the inner sleeve rod of this utility model;

[0020] Figure 5 This is a schematic diagram of the pressure ring structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the internal structure of the horizontal steering seat of this utility model;

[0022] Figure 7 This is a schematic diagram of the camera mounting bracket structure of this utility model.

[0023] In the diagram: 1. Support base; 2. Outer upright; 3. Inner sleeve rod; 4. Horizontal steering seat; 5. Camera mounting bracket; 501. Gear; 502. Rack; 503. First adjusting plate; 504. Second adjusting plate; 6. Worm gear; 7. Worm wheel; 8. Limiting block; 9. Pressure ring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1 to 7 This utility model provides a technical solution: an easily adjustable advertising shooting device, including a support base 1 and an outer pole 2. The bottom of the outer pole 2 is threadedly connected to the through hole at the top of the support base 1. The outer pole 2 is slidably connected to an inner sleeve rod 3 through limiting grooves opened on both sides of its inner wall. The inner sleeve rod 3 is rotatably connected to a horizontal steering seat 4 through a damping rotating shaft set at its top. A camera mounting bracket 5 is rotatably connected above the horizontal steering seat 4. A worm gear 6 and a worm wheel 7 are rotatably connected inside the horizontal steering seat 4. The worm gear 6 is located below the worm wheel 7 and meshes with it. Limiting blocks 8 are movably connected to both ends of the outer wall of the inner sleeve rod 3 near the bottom. Pressure rings 9 are movably connected to both ends of the outer wall of the inner sleeve rod 3 near the top.

[0026] A gear 501 is rotatably connected to one side of the outer wall of the camera mount 5. A rack 502 is meshed with both above and below the gear 501. A first adjusting plate 503 is provided on one side of the outer wall of the camera mount 5. The first adjusting plate 503 is fixedly connected to one end of the rack 502, and the other end of the rack 502 is slidably connected to a groove opened on the surface of the camera mount 5 via a slider. A second adjusting plate 504 is slidably connected to one side of the first adjusting plate 503 via a slider.

[0027] In this embodiment, as Figure 1 and Figure 2As shown, the outer wall of the support base 1 is rotatably connected to diagonal braces in a 120° equiangular distribution. The end of the diagonal brace adjacent to the support base 1 is higher and the other end is lower, forming a slope. The bottom of the diagonal brace has an arched surface, and the part of the bottom of the diagonal brace that contacts the ground is made of rubber. The distribution of the diagonal braces forms a stable triangular support structure, which can effectively distribute the weight of the equipment, enhance the overall stability, and maintain balance under complex terrain and different external forces. The slope shape, with one end higher and the other lower, allows the diagonal brace to form a certain angle of support with the ground. This inclined support method can better distribute the gravity and external forces borne by the support base 1, while the arched surface at the bottom further expands the contact area with the ground, making the entire diagonal brace more stable when supported. It can effectively reduce the shaking caused by uneven ground or external forces, providing a more reliable support foundation for the camera. Its bottom rubber layer has good anti-slip and flexibility, which can increase the friction with the ground and prevent slippage.

[0028] In this embodiment, as Figure 3 , Figure 4 and Figure 5 As shown, several circular through holes for inserting and connecting the limiting blocks 8 are equally spaced on both sides of the inner wall of the outer upright rod 2. The limiting blocks 8 and the pressure rings 9 are symmetrically distributed along the axis of the inner sleeve rod 3. The limiting blocks 8 and the pressure rings 9 are connected as one unit by L-shaped brackets. The bottoms of the two L-shaped brackets are slidably connected to the corresponding grooves on the inner wall of the inner sleeve rod 3 by sliders. At the same time, springs are fixedly connected to the L-shaped brackets at both ends on the inner wall of the inner sleeve rod 3. The limiting blocks 8, through the springs and the pressure rings 9 above, form a sliding extension in the corresponding grooves on both sides of the inner sleeve rod 3. The structure is designed for easy adjustment. By pressing the pressure ring 9 inward with one hand, the limiting block 8 can slide out of the circular through hole of the outer upright 2, releasing the lock on the inner sleeve 3. Then, the inner sleeve 3 can be easily pulled up or down to adjust the height. After adjusting to the appropriate height, the pressure ring 9 can be released, and the limiting block 8 can automatically reset through the action of the spring and insert into the through hole of the outer upright 2 to lock. The whole process is simple to operate and can be done with one hand. This can greatly improve work efficiency in scenarios such as advertising shooting where the height of the equipment needs to be adjusted quickly. The shooting personnel can quickly adjust the bracket to the appropriate height to capture the best shot.

[0029] In this embodiment, as Figure 6As shown, one end of the shaft at the center of the worm gear 7 is rotatably connected to the inner wall of the horizontal steering seat 4, and the other end is fixedly connected to the corresponding side of the bottom of the camera mount 5. Through the meshing transmission of the worm 6 and the worm gear 7, the tilt angle of the camera mount 5 can be precisely adjusted. In advertising shooting, the photographer can precisely adjust the tilt angle of the camera according to the shooting needs to capture the best shooting scene. Moreover, the worm 6 and the worm gear 7 have self-locking characteristics. After the tilt angle of the camera mount 5 is adjusted, the camera mount 5 can be stably maintained at that angle and will not shift due to slight external vibrations or external force interference. This is very important for advertising shooting, especially when shooting for a long time or in an unstable environment, to ensure the stability of the shooting scene and avoid deviation of the shooting content due to angle changes.

[0030] In this embodiment, as Figure 1 and Figure 6 As shown, a handle is fixedly connected to one side of the outer wall of the horizontal steering seat 4, and the camera mount 5 rotates horizontally 180° above the inner sleeve rod 3 via the damping pivot above the horizontal steering seat 4 and the inner sleeve rod 3. The handle fixedly connected to one side of the outer wall of the horizontal steering seat 4 provides a convenient grip for the operator. In actual scenarios such as advertising shooting, the photographer can easily hold the handle and use this point of force to rotate the horizontal steering seat 4, thereby driving the camera mount 5 and the camera to rotate horizontally. This makes the horizontal angle adjustment operation easier and more flexible. The presence of the damping pivot provides a certain damping force during the rotation process, so that the camera mount 5 will not be too flexible or shaky when rotating. The photographer can more accurately control the angle and speed of rotation, adjust the camera to the required precise horizontal position, and ensure the stability of the shooting image.

[0031] In this embodiment, as Figure 7 As shown, one end of the rack 502 with a slider is movably connected to the inner wall of the slide groove of the camera mount 5 via a spring. The racks 502 are in relative motion with respect to each other via gears 501. The first adjusting plates 503 are symmetrically distributed about the vertical center line of the camera mount 5, and the first adjusting plates 503 are in an opening and closing structure with respect to the racks 502. When the gears 501 are rotated, the racks 502 meshing with them will drive the first adjusting plates 503 to move, thereby changing the distance between the first adjusting plates 503. This structure allows the position of the first adjusting plates 503 to be flexibly adjusted according to the width specifications of different cameras, so as to achieve stable fixation of cameras of different sizes. Compared with some complex fixing structures, users do not need to perform cumbersome operation steps to quickly adjust the distance between the first adjusting plates 503 to complete the installation and fixation of the camera. In time-sensitive scenarios such as advertising shooting, this convenient operation method can effectively improve shooting efficiency.

[0032] In this embodiment, as Figure 7 As shown, the second adjusting plate 504 is perpendicular to one side of the first adjusting plate 503 and parallel to the other side of the first adjusting plate 503. A spring is fixedly connected within the groove of the first adjusting plate 503 for sliding the second adjusting plate 504, and the other end of the spring is fixedly connected to a slider on one side of the second adjusting plate 504. This arrangement of the second adjusting plate 504 being perpendicular to one side of the first adjusting plate 503 and parallel to the other side allows for multiple directions of contact and fixation when fixing the camera. Compared to typical fixing structures that only consider the specifications of a single camera surface, this design can… This system provides comprehensive protection for the camera, ensuring it won't easily shake or shift during shooting. This improves the stability and reliability of the camera's fixation, contributing to clearer and more stable images. When dealing with cameras of different sizes, the user can push the second adjustment plate 504 to overcome the spring force and slide it within the groove to adapt to the camera's size. The spring's elasticity also allows the second adjustment plate 504 to fit tightly against the camera surface, achieving good fixation regardless of the camera's thickness or shape, thus enhancing the bracket's versatility for different cameras.

[0033] The usage and advantages of this utility model: This retractable multi-functional stabilizing bracket for advertising photography operates as follows:

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, firstly, thread the bottom of the outer support rod 2 to the through hole at the top of the support base 1 to ensure a tight connection. Then, unfold the diagonal bracing connected to the outer wall of the support base 1 at 120° equidistant angles. Place the camera on the camera mount 5 and pull one of the first adjustment plates 503. Since the first adjustment plate 503 is fixedly connected to one end of the rack 502, and the rack 502 meshes above and below the gear 501 respectively, when the first adjustment plate 503 is pulled, the rack 502 connected to it will drive the gear 501 to rotate. The rotation of the gear 501 will then drive another set of racks 502 in the opposite direction, thus changing the distance between the first adjustment plates 503. The user can precisely adjust the first adjustment plates 503 according to the camera specifications. The distance between them is used to initially fix the camera. Furthermore, one end of the rack 502 with a slider is movably connected to the inner wall of the slide groove of the camera mounting bracket 5 via a spring. The elasticity of the spring provides a certain buffering effect during the adjustment process of the first adjusting plate 503, and provides a stable clamping force after the camera is fixed. After the camera is initially positioned by the first adjusting plate 503, the position of the second adjusting plate 504 can be further adjusted. The user can push the second adjusting plate 504 to overcome the spring force, allowing it to slide within the slide groove of the first adjusting plate 503, tightly fitting against the other side of the camera according to its specifications, achieving multi-faceted protection and more precise fixation of the camera. The spring setting also ensures that the second adjusting plate 504 is properly positioned when fixing the camera. This device provides stable clamping force and resets after the external force is released. Typically, camera brackets use tripods, making height adjustment difficult with one hand. This device allows the user to press the pressure rings 9 near the top of the inner sleeve rod 3 with one hand. The pressure rings 9 are connected to the corresponding limiting block 8 via an L-shaped bracket. When the pressure rings 9 are pressed, the L-shaped bracket compresses the spring fixed to the inner wall of the inner sleeve rod 3. Simultaneously, the L-shaped bracket moves relative to the corresponding groove on the inner wall of the inner sleeve rod 3 via a slider, sliding inwards. At the same time, the limiting block 8 slides out from the circular through holes equidistantly opened on both sides of the inner wall of the outer upright rod 2 for insertion and retracts into the groove on the surface of the inner sleeve rod 3, thus releasing the clamping force. Locking the inner sleeve rod 3: After unlocking the inner sleeve rod 3, the user can pull the inner sleeve rod 3 upwards or downwards. Since the inner sleeve rod 3 slides through the limiting grooves on both sides of the inner wall of the outer upright rod 2, it can ensure that the inner sleeve rod 3 maintains stable vertical movement during adjustment until the appropriate shooting height is reached. When the inner sleeve rod 3 is adjusted to the appropriate height, the pressure on the pressure ring 9 is released. At this time, the springs at the L-shaped bracket positions at both ends of the inner wall of the cavity of the inner sleeve rod 3 return to their original deformation, pushing the limiting block 8 out of the groove on the surface of the inner sleeve rod 3 and inserting it into the corresponding circular through hole of the outer upright rod 2, thus locking the inner sleeve rod 3 after height adjustment. During use, the user holds the handle on one side of the outer wall of the horizontal steering seat 4 and uses the damping shaft set above the inner sleeve rod 3.The horizontal steering mount 4 and the camera mount 5 rotatably connected to it rotate 180° horizontally above the inner sleeve rod 3. The damping shaft provides resistance, making the rotation process smoother and allowing the user to precisely adjust to the appropriate horizontal shooting angle. During focusing, the worm gear 6 inside the horizontal steering mount 4 rotates by operating the power button on one side. The rotation of the worm gear 6 drives the worm wheel 7 to rotate, thereby adjusting the pitch angle of the camera mount 5 to meet different shooting needs.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An easily adjustable advertising shooting device comprising a support base (1) and an external stand (2), characterized in that: The bottom of the outer vertical rod (2) is threadedly connected with the through hole of the top of the support base (1), the inner sleeve rod (3) is slidably connected with the outer vertical rod (2) through the limiting grooves formed on the two sides of the inner wall of the outer vertical rod (2), the horizontal steering base (4) is rotatably connected with the inner sleeve rod (3) through the damping rotating shaft arranged on the top of the inner sleeve rod (3), the camera fixing frame (5) is rotatably connected with the upper portion of the horizontal steering base (4), the worm (6) and the worm wheel (7) are rotatably connected with the inner portion of the horizontal steering base (4) respectively, the worm (6) is located below the worm wheel (7) and is meshedly connected with the worm wheel (7), the two ends of the outer wall of the inner sleeve rod (3) near the bottom are movably connected with the limiting blocks (8), and the two ends of the outer wall of the inner sleeve rod (3) near the top are movably connected with the compression rings (9). The outer wall of the camera fixing frame (5) is rotatably connected with the gear (501) on one side, the upper portion and the lower portion of the gear (501) are meshedly connected with the racks (502), the first adjusting plate (503) is arranged on one side of the outer wall of the camera fixing frame (5), one end of the first adjusting plate (503) is fixedly connected with the rack (502), and the other end of the rack (502) is slidably connected into the sliding groove formed on the surface of the camera fixing frame (5) through the sliding block, and the second adjusting plate (504) is slidably connected on one side of the first adjusting plate (503) through the sliding block.

2. The easily adjustable advertising photography apparatus of claim 1, wherein: The outer wall of the support base (1) is rotatably connected with the inclined support frames in a 120° equiangular distribution mode, one end of the inclined support frame adjacent to the support base (1) is higher, the other end is lower, the inclined support frame is in a slope shape, the bottom of the inclined support frame is in an arched surface, and the part of the bottom of the inclined support frame in contact with the ground is made of rubber material.

3. The easily adjustable advertising photography apparatus of claim 1, wherein: A plurality of circular through holes for inserting and connecting the limiting blocks (8) are equidistantly formed on the two sides of the inner wall of the outer vertical rod (2), the limiting blocks (8) and the compression rings (9) are distributed in a point symmetry mode along the axis of the inner sleeve rod (3), the limiting blocks (8) and the compression rings (9) are connected into an integrated whole through the L-shaped supports, the bottoms of the two L-shaped supports are slidably connected into the sliding grooves formed on the inner wall of the inner sleeve rod (3) through the sliding blocks, meanwhile, the inner sleeve rod (3) is provided with the springs fixedly connected with the positions of the two L-shaped supports on the inner wall of the cavity, the limiting blocks (8) and the compression rings (9) on the two sides of the inner sleeve rod (3) constitute a sliding telescopic structure through the springs and the compression rings (9) above.

4. The easily adjustable advertising photography apparatus of claim 1, wherein: The shaft rod at the axis of the worm wheel (7) is rotatably connected with the inner wall of the horizontal steering base (4) at one end, and is fixedly connected with the corresponding side of the bottom of the camera fixing frame (5) at the other end.

5. The easily adjustable advertising photography apparatus of claim 1, wherein: The outer wall of the horizontal steering base (4) is fixedly connected with the handle on one side, and the camera fixing frame (5) is horizontally rotated by 180° above the inner sleeve rod (3) through the damping rotating shafts on the horizontal steering base (4) and the inner sleeve rod (3).

6. The easily adjustable advertising photography apparatus of claim 1, wherein: The rack (502) is movably connected with the inner wall of the sliding groove of the camera fixing frame (5) through a spring at one end of the sliding block, and the racks (502) are relatively moved through the gear (501), and the first adjusting plates (503) are symmetrically distributed about the vertical center line of the camera fixing frame (5), and the first adjusting plates (503) are opened and closed through the racks (502).

7. The easily adjustable advertising photography apparatus of claim 1, wherein: The second adjusting plate (504) is perpendicular to one side of the first adjusting plate (503) and is parallel to the other side of the first adjusting plate (503), and the sliding groove for sliding the second adjusting plate (504) is fixedly connected with a spring, and the other end of the spring is fixedly connected with the sliding block on one side of the second adjusting plate (504).

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