Center exposure support

Abstract

The utility model discloses a center exposure bracket, and relates to the technical field of mechanical structures and nondestructive testing equipment. The center exposure support is characterized in that the center exposure support comprises a supporting plate, a supporting rod, a connecting base and universal wheels, the upper surface of the supporting plate is fixedly connected with the connecting base, the supporting rod is connected to the connecting base in a lifting mode, and the supporting plate is connected with the universal wheels. According to the central exposure bracket, the supporting rod is in threaded connection with the connecting seat, so that the supporting rod can rotate clockwise or anticlockwise to realize a lifting function, and the height of the supporting rod is adjustable. And secondly, the universal wheels are arranged on the supporting plate, so that the center exposure bracket is convenient for operators to move, the manual carrying process is reduced, in addition, the universal wheels also enable the center exposure bracket to move and steer more flexibly, and the center exposure bracket is suitable for different working condition environments. In addition, the brake mechanism is installed on the center exposure support and used for stopping the universal wheel, detection deviation caused by movement of the universal wheel due to external force is prevented, and the center exposure support is suitable for different environments.

Description

Technical Field

[0001] This utility model relates to the field of mechanical structure and non-destructive testing equipment technology, and in particular to a central exposure bracket. Background Technology

[0002] Flaw detectors, with their unique advantages in non-destructive testing, have been widely used in numerous fields, becoming an important tool for ensuring product quality, equipment safety, and scientific research. In testing, the translational inspection method is commonly used; however, inaccurate calculation of the translation distance can severely impact the quality of the inspected film, affecting both the testing progress and the film's quality. Furthermore, in actual testing, the testing equipment and tooling need to be lifted to the inspection point, often requiring testing at multiple locations, consuming the physical strength and energy of operators, increasing personnel costs, and reducing testing efficiency.

[0003] It is evident that the existing brackets for installing testing equipment require operators to move them to the testing location, which is time-consuming, wastes manpower, and makes it impossible to adjust the installation height of the testing equipment. Utility Model Content

[0004] In view of this, the main objective of this utility model is to provide a central exposure bracket that can solve the problems of inconvenient movement, non-adjustable height, and the inability to stop the bracket when it is moved in the prior art.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] The central exposure bracket includes: a support plate, a support rod, a connecting seat, and casters. The connecting seat is fixedly connected to the upper surface of the support plate, the support rod is elliptical and flexibly connected to the connecting seat, and the support plate is connected to multiple casters.

[0007] In a preferred embodiment, the support plate has a through hole, and a connecting sleeve is fixed inside the through hole;

[0008] In a preferred embodiment, the sleeve includes: a stepped groove, an upper end, a lower end, an annular boss, and a guide groove;

[0009] In a preferred embodiment, the upper and lower ends of the sleeve are connected, the stepped groove is formed along the radial sidewall of the sleeve, the guide groove is formed along the axial sidewall of the sleeve, and the stepped groove is connected to the guide groove.

[0010] In a preferred embodiment, the lower end outer wall and the through hole are fixedly connected, and the lower end inner wall extends inward with an annular boss;

[0011] In a preferred embodiment, a braking mechanism extends downward from inside the sleeve.

[0012] In a preferred embodiment, the braking mechanism includes: a limiting ring, a brake pin, a brake plate, and a brake spring;

[0013] In a preferred embodiment, the lower end of the brake column is fixedly connected to the brake plate, and the upper end of the brake column passes through the through hole and is fixedly connected to the limiting ring. The limiting ring has an integrally formed guide protrusion, and the guide protrusion is in clearance fit with the stepped groove and the guide groove.

[0014] In a preferred embodiment, the brake spring is sleeved on the outer wall of the brake column, with the upper end of the brake spring abutting against the limiting ring and the lower end of the brake spring abutting against the annular boss.

[0015] In a preferred embodiment, the braking mechanism further includes: a retaining ring, a brake lever, and a brake pedal;

[0016] In a preferred embodiment, the retaining ring is disposed on the upper side of the brake plate, the retaining ring is fixedly connected to the lower end of the brake lever, the brake lever is fixedly connected to both sides of the retaining ring, and the brake pedal is fixedly connected to the other end of the brake lever.

[0017] In a preferred embodiment, the support rod includes a support portion and a threaded post. The lower side of the support portion is fixedly connected to the upper end of the threaded post. The support portion is a semi-circular plate-shaped structure. The outer wall of the threaded post is provided with external threads, and the connecting seat is provided with internal threads. The threaded post and the connecting seat are rotatably connected by threaded engagement.

[0018] In a preferred embodiment, the support rod further includes: a first support rod and a second support rod, and the connecting seat includes: a first connecting seat and a second connecting seat;

[0019] In a preferred embodiment, the first connecting seat and the second connecting seat are respectively perpendicular to the upper surface of the support plate; the first support rod and the second support rod are respectively threadedly connected to the first connecting seat and the second connecting seat for rotational connection.

[0020] In a preferred embodiment, the upper end of the sleeve is lower than the upper end of the connecting seat.

[0021] In a preferred embodiment, a fixing box is also fixedly connected to the support plate. The fixing box has a U-shaped groove and further includes a box cover. The box cover is snapped to the fixing box, and a rope winding mechanism is rotatably connected inside the fixing box.

[0022] In a preferred embodiment, the winding mechanism includes: a spring, a winding rope, a housing, and a fixing post. The spring is fixedly connected to the winding rope, and the spring and the winding rope are retracted inside the housing. Fixing posts are integrally connected to both sides of the outer side of the housing, and the fixing posts extend from the U-shaped slot.

[0023] In a preferred embodiment, a plurality of the casters are fixedly connected to the four corners of the support plate.

[0024] In a preferred embodiment, the lower surface of the brake plate is provided with anti-slip texture, which is evenly distributed along the circumference of the brake plate.

[0025] The center exposure support of this utility model has the following beneficial effects:

[0026] The central exposure bracket is characterized by comprising: a support plate, a support rod, a connecting seat, and casters. The connecting seat is fixedly connected to the upper surface of the support plate, the support rod is elliptical and movably connected to the connecting seat, and the support plate is connected to a plurality of casters.

[0027] This central exposure bracket features a threaded connection between a support rod and a connecting seat, allowing the support rod to be raised and lowered via clockwise and counterclockwise rotation, thus achieving height adjustment. Secondly, the inclusion of casters on the support plate facilitates operator movement, reducing manual handling. The casters also provide greater flexibility in movement and steering, making it suitable for various working conditions. Furthermore, a braking mechanism is installed to stop the casters, preventing deviations caused by external forces when moving them to the testing location. This central exposure bracket boasts a simple structure, is easy to maintain, and is suitable for diverse environments. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a central exposure support according to an embodiment of the present disclosure;

[0030] Figure 2 This is a schematic diagram of the structure of a center exposure support plate according to an embodiment of the present disclosure;

[0031] Figure 3 This is a schematic diagram of the structure of the sleeve of the central exposure support according to one embodiment of the present disclosure;

[0032] Figure 4 A cross-sectional view of the sleeve of a central exposure support according to one embodiment of the present disclosure;

[0033] Figure 5 This is a schematic diagram of the braking mechanism of a central exposure bracket according to one embodiment of the present disclosure;

[0034] Figure 6 This is a schematic diagram of the sleeve connection braking mechanism of a central exposure bracket according to an embodiment of the present disclosure;

[0035] Figure 7 This is a schematic diagram of the braking column and braking plate of a central exposure bracket according to an embodiment of the present disclosure;

[0036] Figure 8 This is a schematic diagram of the limiting ring of the central exposure holder according to one embodiment of the present disclosure;

[0037] Figure 9 This is a schematic diagram of the fixing ring, brake lever, and brake pedal of a center exposure bracket according to an embodiment of the present disclosure;

[0038] Figure 10 This is a schematic diagram of the structure of the support rod of the central exposure holder according to one embodiment of the present disclosure;

[0039] Figure 11 This is a structural schematic diagram of the center exposure bracket from another angle according to one embodiment of the present disclosure;

[0040] Figure 12 This is a structural schematic diagram of a central exposure support at another angle according to an embodiment of the present disclosure;

[0041] Figure 13 This is a schematic diagram of the structure of the fixing box of the center exposure bracket according to one embodiment of the present disclosure;

[0042] Figure 14 This is a schematic diagram of the structure of the fixing box cover of the center exposure bracket according to an embodiment of the present disclosure when it is open;

[0043] Figure 15 This is a schematic diagram of the rope winding mechanism of a central exposure support according to one embodiment of the present disclosure;

[0044] Figure 16 This is a schematic diagram of the structure of a central exposure bracket with one side of the outer casing removed, according to an embodiment of the present disclosure.

[0045] [Explanation of Key Component Symbols]

[0046] 1. Support plate;

[0047] 11. Through hole;

[0048] 2. Support rod;

[0049] 21. Supporting part; 22. Threaded column; 23. First support rod; 24. Second support rod;

[0050] 3. Connecting base;

[0051] 31. First connecting seat; 32. Second connecting seat;

[0052] 4. Casters;

[0053] 5. Sleeve;

[0054] 51. Stepped groove; 52. Upper end; 53. Lower end; 54. Annular boss; 55. Guide groove;

[0055] 6. Braking mechanism;

[0056] 61. Limiting ring; 62. Brake pin; 63. Brake plate; 64. Brake spring;

[0057] 65. Retaining ring; 66. Brake lever; 67. Brake pedal;

[0058] 611. Guide protrusion;

[0059] 7. Fixing box;

[0060] 71. U-shaped groove; 72. Box lid;

[0061] 8. Rope winding mechanism;

[0062] 81. Clockwork spring; 82. Winding rope; 83. Housing; 84. Fixing post. Detailed Implementation

[0063] The method of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0064] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0065] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0066] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0067] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] according to Figure 1 — Figure 16As shown, the central exposure bracket includes: a support plate 1 for mounting various components, a support rod 2 for supporting the X-ray equipment, a connecting seat 3 rotatably connected to the support rod, and casters 4 for moving the central exposure bracket. The connecting seat 3 is integrally connected to the support plate 1 or welded to the support plate. The integral connection of the connecting seat 3 to the support plate 1 increases the overall structural strength, reduces the use of connecting parts, and makes the central exposure bracket easy to maintain during use. The support rod 2 is vertically and height-adjustable connected to the connecting seat 3. By threading the support rod 2 into the connecting seat 3, when the support rod 2 is rotated clockwise, it lowers relative to the connecting seat 3; when the support rod 2 is rotated counterclockwise, it rises relative to the connecting seat 3. This vertical adjustment of the support rod 2 allows the height of the X-ray equipment fixed on the support rod to be adjusted according to actual usage needs, thereby reducing manual labor and improving detection efficiency. To enable the central exposure bracket to move, four casters 4 are connected to the four corners below its support plate 1. Each caster 4 can rotate 360°. The operator can push the casters 4 to rotate the whole bracket at a certain angle, thereby moving the central exposure bracket in the desired direction, which is convenient for the operator to control.

[0069] The upper surface of the support plate 1 is fixed to the connecting seat 3, and the lower surface of the support plate 1 is fixed to the universal wheel 4. To facilitate the fixing of the braking mechanism 6, a through hole 11 is provided at the center of the support plate 1. The sleeve 5 is inserted into the through hole 11, and the lower outer wall of the sleeve 5 is welded to the inner wall of the through hole 11. This is done to reduce the number of connecting parts and enhance the integral connection of the central exposure bracket. To further explain the sleeve 5, it includes: a stepped groove 51 for adjusting the height of the braking mechanism 6, an upper end 52 located away from the support plate 1, and a lower end 53 located near the upper end face of the support plate 1. An annular boss 54 is located on the inner wall of the lower end of the sleeve 5 and extends circumferentially along the inner wall of the sleeve 5. The annular boss 54 is a hollow structure, and the braking pin 62 passes through the annular boss 54.

[0070] To facilitate the installation of the braking mechanism 6, the upper and lower end faces of the cylindrical sleeve 5 are open. A guide groove 55, used for adjusting the height of the braking mechanism 6, is formed along the axial sidewall of the sleeve 5. The guide groove 55 extends along the axial direction of the sleeve 5. A stepped groove 51, used to limit the braking mechanism 6 via the guide protrusion 611, is formed along the radial sidewall of the sleeve 5. The stepped groove 51 extends radially along the sleeve 5 and communicates with the guide groove 55. To control the descent height of the braking mechanism 6, multiple stepped grooves 51 are provided and are evenly distributed from one end of the guide groove 55 to the other. The spacing between adjacent stepped grooves 51 determines the adjustable descent height of the braking mechanism 6. When the brake pin 62 drives the guide protrusion 611 to slide along the guide groove 55 to the target height, rotating the brake pin 62 causes the guide protrusion 611 to engage with the stepped groove 51, thereby limiting the axial movement of the brake pin 62.

[0071] An annular boss 54 extends from the inner wall of the lower end 53. The outer diameter of the annular boss 54 is the transition point where it extends from the inner wall. The end face of the annular boss 54 connects to the inner wall in a stepped shape. Its outer diameter is the same as the inner diameter of the upper end 52. The brake rod 62 passes through the annular boss 52 to the lower end of the support plate. A brake mechanism 6 is movably connected inside the sleeve 5. The function of the annular boss 54 is to ensure that when the brake mechanism 6 is installed through the through hole 11, the brake spring 64 sleeved on the outside of the brake pin 62 can be accommodated inside the sleeve 5 with sufficient elastic deformation space, and the two ends of the brake spring 64 can abut against the upper surface of the annular boss 54 and the lower surface of the limiting ring 61, respectively.

[0072] To achieve the stopping function of the central exposure bracket, a braking mechanism 6 is movably connected to its support plate 1. The braking mechanism 6 includes: a limiting ring 61 that is fixed in position when the height of the braking mechanism is adjusted; a brake pin 62 that is fixedly connected to the limiting ring 61 and the brake plate 63 at both ends of the through hole 11; a brake plate 63 that uses friction to achieve the stopping purpose by contacting the ground; and a brake spring 64 that serves to reset the braking mechanism 6.

[0073] To facilitate the direct application of downward pressure from the brake column 62 to the brake plate 63, the lower end of the brake column 62 is welded to or threaded to the brake plate 63, which is located below the support plate 1. The other end of the brake column 62 passes through the through hole 11 and is threaded to the limiting ring 61. The limiting ring 61 has an integrally formed guide protrusion 611, which is clearance-fitted with the stepped groove 51 and the guide groove 55 to allow the guide protrusion 611 to slide within them. The guide protrusion 611 is used to fix the position of the brake column 62 when it is adjusted to a certain height. To further explain, when the brake column 62 descends, the limiting ring 61 threaded to one end drives the guide protrusion 611 to slide within the guide groove 55. To maintain this position when the brake column 62 descends to a certain height, the brake column 62 rotates counterclockwise, causing the guide protrusion 611 to rotate into the stepped groove 51 along with it. At this time, the longitudinal movement of the guide protrusion 611 is constrained by the brake groove, and the longitudinal movement of the moving column 62 is also constrained, thereby fixing the descent height of its braking mechanism 6.

[0074] To ensure that the brake pin 62 can return to its original position after descent, a brake spring 64 is fitted onto the outer wall of the brake pin 62. The upper end of the brake spring 64 abuts against the lower surface of the limiting ring 61, and the lower end of the brake spring 64 abuts against the upper surface of the annular boss 54. The brake spring 64 provides an automatic reset function for the braking mechanism 6, improving the ease of operation. The use of a spring drive makes the lifting mechanism 6 structurally reliable and facilitates maintenance and replacement.

[0075] To facilitate operation, the braking mechanism 6 further includes: a fixing ring 65 for fixing the brake lever 66, a brake lever 66 for transmitting force, and a brake pedal 67 for providing a foot switch for the operator. In this embodiment, the fixing ring 65 is located on the upper side of the brake plate 63, and the outer walls of both sides of the fixing ring 65 are threaded to the lower end of the brake lever 66. This allows the fixing ring 65 to directly contact the brake plate 63, facilitating better driving of the brake plate 63. The brake lever 66 is welded to both sides of the fixing ring 65. To further increase the connection strength between the fixing ring 65 and the brake pin 62, the fixing ring 65 can be divided into a left half and a right half, which are fixedly connected by a threaded nut. The fixing ring 65 can also be directly fixedly connected to the brake pin 62 by fitting it onto the brake pin. In this embodiment, there are two brake levers 66 to increase the force transmission effect when driving the brake pin 62 to rotate. The brake pedal 67 is integrally connected to or welded to the brake pin 62.

[0076] The following describes the operation of the braking mechanism 6 in this specific embodiment. The operator presses down the brake pedal 67, causing the brake column 62 to press down. The guide protrusion 611 slides along the guide groove 55, at which point the limiting ring 61 presses down the brake spring 64. When the brake plate 63 contacts the ground, friction is generated between the brake plate 63 and the ground, restricting the sliding of the caster wheel 4. At this time, rotating the brake pedal 67 to the right causes the brake column 62 to rotate counterclockwise, and the guide protrusion 611 slides radially into the stepped groove 51, thereby limiting the descent height of the brake column 62. When braking needs to be stopped, the operator only needs to press the brake pedal 67 and rotate it to the left. The guide protrusion 611 slides back into the guide groove 55, and the brake spring 64, to restore its compressed deformation, drives the limiting ring 61 to rise and reset.

[0077] The support rod 2 for fixing the testing equipment includes a support portion 21 and a threaded post 22. The lower side of the support portion 21 is welded to or threadedly connected to the threaded post 22. The support portion 21 has a semi-circular plate structure, which increases the contact surface with the testing equipment, reduces the shaking of the testing equipment, acts as a handle when the threaded post 22 needs to be rotated, and makes the testing equipment more stable during movement, ensuring the stability of the testing area. To ensure that the support rod can rotate and lower and raise, the threaded post 22 has external threads, and the threaded post 22 is rotatably connected to the connecting seat 3. The connecting seat 3 has a threaded hole in the center and internal threads inside. When the operator is in front of the brake pedal 67, rotating the threaded post 22 clockwise lowers the support rod 2 until its end face reaches the end face of the internal threaded hole of the connecting seat 3. Rotating the threaded post 22 counterclockwise raises the support rod 2 until its end face disengages from the threaded hole of the connecting seat 3. The threaded post 22 and the connecting seat 3 ensure that the fixed height of the inspection device is adjustable to adapt to different working conditions, increasing the flexibility of the inspection bracket and improving convenience.

[0078] Accordingly, the detection device needs to be fixed at both ends to make it parallel to the ground. In this specific embodiment, there are two support rods 2, which are arranged in pairs. The support rods 2 also include: a first support rod 23 and a second support rod 24. The first support rod 23 and the second support rod 24 are parallel to each other on the upper surface of the support plate 1, that is, the centers of the first support rod 23 and the second support rod 24 are on the same horizontal plane. The parallel layout increases the straightness when fixing the detection device.

[0079] In addition, for connection with support rod 2, connecting seat 3 includes: first connecting seat 31 and second connecting seat 32, the first connecting seat 31 and the second connecting seat 32 being perpendicular to the upper surface of support plate 1. First support rod 23 and second support rod 24 are threadedly connected to first connecting seat 31 and second connecting seat 32 respectively.

[0080] The height of the upper end of the sleeve 5 is lower than the height of the upper end of the connecting seat 3. This is to ensure that when the brake spring 64 is compressed and reset, the brake column 62 will not interfere with the detection device fixed to the support part 21 during its upward movement.

[0081] In addition, a fixing box 7 is welded above the support plate 1 to house the rope winding mechanism 8. The fixing box 7 has a U-shaped slot 71 that extends through both sides of the fixing box 7, providing installation space for the fixing post 84, which can rotate within the U-shaped slot. The fixing box 7 also includes a cover 72, which further secures the rope winding mechanism 8 inside the fixing box, preventing it from sliding out of the fixing box 7 when the rope winding mechanism 82 is pulled, thus preventing the fixing post 84 from sliding out of the U-shaped slot. To ensure the fixing box 7 and the cover 72 are securely connected, they are snap-fitted together. A snap-fit ​​is provided at the point where the cover 72 engages with the U-shaped slot 71, and a slot is provided at the point where the U-shaped slot 71 engages with the cover 72. The rope winding mechanism 8 is rotatably connected inside the fixing box 7.

[0082] To secure the inspection equipment to the support 21, the rope winding mechanism 8 includes: a spring-loaded spring 81 that provides elastic reset; a rope 82 for binding the inspection equipment; a housing 83 that houses the spring-loaded spring 81 and the rope 82; and fixing posts 84 that secure the rope winding mechanism 8 inside the fixing box 7. The spring-loaded spring 81 is fixedly connected to the rope 82, and the spring-loaded spring 81 and the rope 82 are retracted inside the housing 83. Fixing posts 84 are integrally connected to both sides of the outer side of the housing 83, and the fixing posts 84 extend from the U-shaped slot 71. When the end of the rope 82 is pulled, the rope 82 is pulled out from the retracted state and bound to the inspection equipment. After the inspection is completed, the inspection equipment is disassembled, and the rope 82 elastically resets by the spring-loaded spring 81, retracting into the housing 83 and returning to the retracted state along with the spring-loaded spring 81. The rope winding mechanism 8 simplifies the binding operation, reduces the stacking of unnecessary parts on the support plate 1, and prevents the universal wheel 4 from jamming due to the rope 82 falling out and interfering with it. To further enhance the braking effect and increase the friction between the brake plate 63 and the ground, the lower surface of the brake plate 63 is provided with anti-slip textures, which are evenly distributed along the circumference of the brake plate 63.

[0083] In this specific embodiment, multiple casters 4 are fixedly connected to the four corners below the support plate 1, and each caster 4 can rotate 360°. The casters 4 can be made of polyamide material or have a polyamide wear-resistant layer coated on the surface of a metal caster. Polyamide has high strength and good wear resistance, and can withstand large tensile and frictional forces, thereby extending the service life of the caster.

[0084] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A center exposure holder, characterized in that, include: The support plate (1), support rod (2), connecting seat (3) and casters (4) are provided. The upper surface of the support plate (1) is fixedly connected to the connecting seat (3). The support rod (2) is vertically connected to the connecting seat (3). The support plate (1) is connected to multiple casters (4).

2. The center exposure holder according to claim 1, characterized in that, The support plate has a through hole (11), and a connecting sleeve (5) is fixed inside the through hole (11); The sleeve (5) includes: a stepped groove (51), an upper end (52), a lower end (53), an annular boss (54), and a guide groove (55); The sleeve (5) is open at both the top and bottom ends. The stepped groove (51) is opened along the radial sidewall of the sleeve (5). The guide groove (55) is opened along the axial sidewall of the sleeve (5). The stepped groove (51) and the guide groove (55) are connected. The outer wall of the lower end (53) is fixedly connected to the through hole (11), and the inner wall of the lower end (53) extends inward with an annular boss (54); The sleeve (5) has a braking mechanism (6) extending downwards inside.

3. The center exposure bracket according to claim 2, characterized in that, The braking mechanism (6) includes: a limiting ring (61), a brake pin (62), a brake plate (63), and a brake spring (64); The brake pin (62) is fixedly connected to the brake plate (63) at its lower end, and the brake pin (62) is fixedly connected to the limiting ring (61) through the through hole (11) at its upper end. The limiting ring (61) has an integrally formed guide protrusion (611), and the guide protrusion (611) is in clearance fit with the stepped groove (51) and the guide groove (55). The brake spring (64) is sleeved on the outer wall of the brake column (62), with the upper end of the brake spring (64) abutting against the limiting ring (61) and the lower end of the brake spring (64) abutting against the annular boss (54).

4. The center exposure holder according to claim 3, characterized in that, The braking mechanism (6) further includes: a retaining ring (65), a brake lever (66), and a brake pedal (67); The fixing ring (65) is located on the upper side of the brake plate (63). The fixing ring (65) is fixedly connected to the lower end of the brake lever (66). The brake lever (66) is fixedly connected to both sides of the fixing ring (65). The brake pedal (67) is fixedly connected to the other end of the brake lever (66).

5. The center exposure bracket according to claim 4, characterized in that, The support rod (2) includes a support part (21) and a threaded column (22). The lower side of the support part (21) is fixedly connected to the upper end of the threaded column (22). The support part (21) is a semi-circular plate structure. The outer wall of the threaded column (22) is provided with external threads. The connecting seat (3) is provided with internal threads. The threaded column (22) and the connecting seat (3) are rotatably connected by threaded engagement.

6. The center exposure bracket according to claim 5, characterized in that, The support rod (2) further includes: a first support rod (23) and a second support rod (24), and the connecting seat (3) includes: a first connecting seat (31) and a second connecting seat (32); The first connecting seat (31) and the second connecting seat (32) are respectively perpendicular to the upper surface of the support plate (1); the first support rod (23) and the second support rod (24) are respectively threadedly connected to the first connecting seat (31) and the second connecting seat (32).

7. The center exposure bracket according to claim 6, characterized in that, The upper end of the sleeve (5) is lower than the upper end of the connecting seat (3).

8. The center exposure holder according to claim 7, characterized in that, A fixing box (7) is also fixedly connected to the support plate (1). The fixing box (7) has a U-shaped slot (71). The fixing box (7) also includes a box cover (72). The box cover (72) is snapped to the fixing box (7). The fixing box (7) is rotatably connected to a rope winding mechanism (8). The winding mechanism (8) includes: a spring (81), a winding rope (82), a housing (83), and a fixing post (84). The spring (81) is fixedly connected to the winding rope (82). The spring (81) and the winding rope (82) are retracted inside the housing (83). The fixing post (84) is integrally connected to both sides of the outer side of the housing (83). The fixing post (84) extends out from the U-shaped slot (71).

9. The center exposure holder according to claim 8, characterized in that, Multiple casters (4) are fixedly connected to the four corners of the support plate (1).

10. The center exposure holder according to claim 9, characterized in that, The lower surface of the brake plate (63) is provided with anti-slip texture.

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