An ultrasonic detection device for thermal power pipeline

Abstract

The present invention provides an ultrasonic detection device for thermal power pipelines, which relates to the technical field of pipeline detection equipment, and solves the problem that the existing ultrasonic detection device lacks a structure that can fix the detection device to the pipeline. When performing detection, the staff needs to lift the detection device to detect the pipeline. Long-term lifting easily makes the staff feel tired, thereby affecting the work efficiency. The device includes a mounting mechanism; an adjustment mechanism is arranged in the mounting mechanism. When in use, the pipeline wall is inserted between the main body and the fixed frame, and the adjusting screw is rotated to drive the top plate to move upward, and the elastic block is contacted with the pipeline wall. By arranging a ball in the elastic block, the position of the fixed frame fixed to the pipeline wall can be adjusted. After the position adjustment is completed, the adjusting screw is continued to be rotated to squeeze the elastic block into the circular through hole, so that the top plate is against the pipeline wall, so that the main body is fixed.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline detection equipment, and more specifically, particularly relates to an ultrasonic detection device for thermal power pipelines. Background Art

[0002] Ultrasonic testing is a method of inspecting defects by utilizing the characteristics of ultrasonic energy that can be transmitted deep into the pipeline and reflected at the edge of the inner wall of the pipeline. The probe of the ultrasonic detector is extended into the inside of the boiler pipeline. When the ultrasonic wave encounters a defect, it will be reflected back and form a pulse waveform on the fluorescent screen. The location and size of the defects inside the pipeline can be determined based on these pulse waveforms.

[0003] For example, application number: CN201821894204.4 involves an ultrasonic detection device for boiler pipelines, including an ultrasonic detector body, a data cable is installed on the top of the ultrasonic detector body, and a plug is installed at one end of the data cable, a connecting block is installed on one side of the plug, a connecting rod is installed at the bottom of the connecting block, and a universal ball is installed on one side of the connecting block, a universal ball seat is installed on one side of the universal ball, and a flaw detection metal block is installed on one side of the universal ball seat, and a protective rubber stick is installed on one side of the damping spring. The present invention is novel and provides a connecting rod, a universal ball seat, a universal ball and a telescopic rod, which solves the problem that the user cannot hold the flaw detection metal block to detect the boiler pipeline when detecting a boiler pipeline installed at a higher position, and provides a fixing ring, a protective rubber stick and a damping spring, which solves the problem that the flaw detection metal block is easy to collide with the metal hard objects next to the high boiler pipeline when the flaw detection metal block approaches the high boiler pipeline.

[0004] Based on the prior art, it is found that the existing ultrasonic detection device lacks a structure that can fix the detection device to the pipeline. When performing detection, the staff needs to lift the detection device to detect the pipeline. Long-term lifting can easily make the staff feel tired, thereby affecting work efficiency. In addition, the existing ultrasonic detection device lacks a structure that can control the detection instrument for mobile detection. When in use, it is inconvenient to extend the detection instrument into the interior of the pipeline, which has limitations in use and is inconvenient for staff to perform detection. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an ultrasonic detection device for thermal power pipelines to solve the problem that the existing ultrasonic detection device lacks a structure that can fix the detection device to the pipeline. When performing detection, the staff needs to lift the detection device to detect the pipeline. Long-term lifting can easily make the staff feel tired, thereby affecting work efficiency. In addition, the existing ultrasonic detection device lacks a structure that can control the detection instrument to perform mobile detection. When in use, it is inconvenient to extend the detection instrument into the interior of the pipeline, which has limitations in use and is inconvenient for the staff to perform detection.

[0006] The purpose and effect of the ultrasonic detection device for thermal power pipelines of the present invention are achieved by the following specific technical means:

[0007] An ultrasonic detection device for thermal power pipelines, comprising:

[0008] The mounting mechanism comprises a main body, a guide groove, a mounting groove and a bottom groove provided on the main body;

[0009] An adjustment mechanism is arranged in the mounting mechanism, an adjustment rod of the adjustment mechanism is rotatably mounted in the mounting groove of the mounting mechanism, the adjustment rod passes through the front side of the main body of the mounting mechanism, and an insert is rotatably mounted in a circular through hole at the front end of the main body of the mounting mechanism;

[0010] A detection mechanism is installed on the installation mechanism, wherein a moving part of the detection mechanism is slidably installed in the installation groove, and the moving part is threadedly connected with the adjustment rod, and the guide gear is engaged with the rack in the guide groove;

[0011] The fixing mechanism is arranged at the bottom of the installation mechanism, and the fixing frame of the fixing mechanism is fixed in the bottom groove by bolts.

[0012] Furthermore, the installation mechanism includes:

[0013] The main body is an L-shaped long strip structure as a whole, and eight sets of spherical grooves are provided at the lower end of the main body, and balls are rotatably installed in the spherical grooves;

[0014] The guide groove is a rectangular groove, and the guide groove is opened in the middle position of the main body, and a rack is arranged in the guide groove.

[0015] Furthermore, the installation mechanism also includes:

[0016] The mounting groove is a rectangular groove, and the mounting groove is arranged on the inner side of the upper end of the main body;

[0017] The bottom groove is a rectangular groove, and a fixing screw hole is arranged in the bottom groove. There are two groups of bottom grooves in total, and the bottom grooves are arranged at the front side of the lower end of the main body.

[0018] Furthermore, the regulating mechanism comprises:

[0019] The adjusting rod is a cylindrical structure, and a thread is provided on the outer side of the adjusting rod, and a cylindrical structure is provided at the front end of the adjusting rod, and a handle is provided at the front end of the cylindrical structure;

[0020] The embedded part is cylindrical and has a structure. A circular through hole is arranged inside the embedded part, and circular clamping rings are arranged on both sides of the embedded part. The embedded part is sleeved on the cylindrical structure at the front end of the adjusting rod.

[0021] Furthermore, the detection mechanism includes:

[0022] The moving part is a T-shaped structure as a whole, and a rectangular protrusion structure is provided at the rear side of the moving part, a threaded through hole is provided in the rectangular protrusion structure, two sets of rotating shafts are provided at the front end of the moving part, and an ultrasonic transmitter is provided at the top of the moving part;

[0023] The fixing groove is a "cross" shaped groove, and there are two sets of fixing grooves in total, and the fixing grooves are arranged at the front side of the upper end of the moving part, and the fixing grooves pass through the top of the moving part;

[0024] There are two sets of guide gears, and the guide gears are sleeved on the rotating shaft at the front end of the moving part.

[0025] Furthermore, the detection mechanism also includes:

[0026] The slider is a "cross" shaped structure, and there are two sets of sliders in total. The sliders are symmetrically arranged inside the fixed groove, and an elastic member is arranged between the slider and the fixed groove;

[0027] The contact plate is an L-shaped plate structure, and a wedge-shaped structure is arranged on the top of the contact plate. The contact plate is arranged on the top of the slider.

[0028] Furthermore, the fixing mechanism comprises:

[0029] The fixing frame is a square plate structure, and two sets of L-shaped fixing plates are provided at the upper end of the fixing frame, and bolt holes are provided inside the fixing frame;

[0030] The slide groove is a triangular groove, and the slide groove is arranged on the inner side of the L-shaped fixing plate at the upper end of the fixing frame.

[0031] Furthermore, the fixing mechanism further comprises:

[0032] The top plate is an arc-shaped plate-like structure, and the top plate is arranged at the upper end of the fixing frame, and two groups of triangular protrusion structures are arranged on the front side of the top plate, the triangular protrusions are clamped in the slide grooves, and six groups of cylindrical grooves are arranged on the upper end of the top plate;

[0033] An adjusting screw is rotatably mounted on the bottom of the top plate, and the adjusting screw is threadably connected to the fixing frame;

[0034] The spring block is a cylindrical structure, and a rotatable ball is embedded on the upper end of the spring block. The spring block is inserted into the cylindrical groove on the upper end of the top plate, and an elastic member is arranged between the spring block and the cylindrical groove.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. In this device, a fixing mechanism is provided, the fixing frame is installed into the bottom groove at the lower end of the main body by bolts, the adjusting screw is rotated and installed at the bottom of the top plate, and the adjusting screw is connected to the fixing frame by threads, a slide groove is provided on the inner side of the fixing frame, the triangular protrusion on the front side of the top plate is clamped into the slide groove, a circular through hole is provided on the top plate, and the elastic block is inserted into the through hole. When in use, the pipeline wall is inserted between the main body and the fixing frame, and the adjusting screw is rotated to drive the top plate to move upward, and the elastic block is contacted with the pipeline wall. By arranging a ball in the elastic block, the position of the fixing frame fixed to the pipeline wall can be adjusted. After the position adjustment is completed, the adjusting screw is continued to be rotated to squeeze the elastic block into the circular through hole, so that the top plate is against the pipeline wall, thereby fixing the main body;

[0037] 2. In this device, an adjustment structure and a detection mechanism are provided, the adjustment rod is rotated and installed into the main body through an embedded part, the moving part is slidably installed into the installation groove, and the moving part is threadedly connected with the adjustment rod, the guide gear at the front end of the moving part is engaged with the rack in the guide groove, so that the moving part can slide on the main body, the ultrasonic transmitter is fixed to the upper end of the moving part, and a fixing groove is opened at the upper end of the moving part, the slider with the contact plate is slidably installed into the fixing groove, the display is placed in four groups of contact plates for fixing, the display is connected to the ultrasonic transmitter through a wire, after the main body is fixed to the pipeline, the contact plate is pulled to remove the display, the adjustment rod is rotated to make the moving part drive the ultrasonic transmitter to move deeper into the pipeline, the display is observed while the adjustment rod is rotated, and the inside of the pipeline can be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0039] Figure 2 The present invention is Figure 1 A schematic diagram of the local enlarged structure at point A is presented.

[0040] Figure 3 It is a schematic diagram of the decomposition structure of the present invention.

[0041] Figure 4 It is a schematic diagram of the exploded structure of the detection device of the present invention.

[0042] Figure 5 It is a schematic diagram of the exploded structure of the fixing device of the present invention.

[0043] 1. Installation mechanism;

[0044] 101, main body; 1011, guide groove; 1012, mounting groove; 1013, bottom groove;

[0045] 2. Adjustment mechanism; 201. Adjustment rod; 202. Insert;

[0046] 3. Testing agency;

[0047] 301, moving part; 3011, fixed groove; 3012, guide gear;

[0048] 302, slider; 3021, contact plate;

[0049] 4. Fixing mechanism;

[0050] 401, fixed frame; 4011, slideway;

[0051] 402, top plate; 4021, adjusting screw; 4022, spring block. DETAILED DESCRIPTION

[0052] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0053] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Example:

[0056] As attached Figure 1 To Attachment Figure 5 As shown:

[0057] The present invention provides an ultrasonic detection device for a thermal power pipeline, comprising: a mounting mechanism 1; an adjusting mechanism 2 is arranged in the mounting mechanism 1, and an adjusting rod 201 of the adjusting mechanism 2 is rotatably installed in a mounting groove 1012, the adjusting rod 201 passes through the front side of a main body 101, and an insert 202 is rotatably installed in a circular through hole at the front end of the main body 101; a detection mechanism 3 is installed on the mounting mechanism 1, and a moving part 301 of the detection mechanism 3 is slidably installed in the mounting groove 1012, and the moving part 301 is threadedly connected with the adjusting rod 201, and a guide gear 3012 is engaged with a rack in the guide groove 1011; a fixing mechanism 4 is arranged at the bottom of the mounting mechanism 1, and a fixing frame 401 of the fixing mechanism 4 is fixed to a bottom groove 1013 by bolts.

[0058] like Figure 3 As shown, the mounting mechanism 1 includes: a main body 101, which is an L-shaped long strip structure as a whole, and eight groups of spherical grooves are provided at the lower end of the main body 101, and balls are rotatably installed in the spherical grooves; a guide groove 1011, which is a rectangular groove, and the guide groove 1011 is opened in the middle position of the main body 101, and a rack is provided in the guide groove 1011; a mounting groove 1012, which is a rectangular groove, and the mounting groove 1012 is arranged on the inner side of the upper end of the main body 101; a bottom groove 1013, which is a rectangular groove, and a fixing screw hole is provided in the bottom groove 1013, and there are two groups of bottom grooves 1013, and the bottom groove 1013 is arranged at the front side of the lower end of the main body 101, the main body 101 is provided with a slidable mounting detection mechanism 3, the guide groove 1011 is provided, which can guide the movement of the moving part 301, the mounting groove 1012 is provided, the moving part 301 can be slidably installed, and the bottom groove 1013 can be provided to install the fixing frame 401 through bolts.

[0059] like Figure 3 As shown, the adjustment mechanism 2 includes: an adjustment rod 201, which is a cylindrical structure, and a thread is provided on the outer side of the adjustment rod 201, and a cylindrical structure is provided at the front end of the adjustment rod 201, and a handle is provided at the front end of the cylindrical structure; an insert 202, which is a cylindrical structure, and a circular through hole is provided inside the insert 202, and circular retaining rings are provided on both sides of the insert 202, and the insert 202 is sleeved on the cylindrical structure at the front end of the adjustment rod 201. The adjustment rod 201 is provided to control the movement of the movable part 301, and the insert 202 is provided to facilitate the rotation and installation of the adjustment rod 201 to the main body 101.

[0060] As an implementation method of this application, Figure 4As shown, the detection mechanism 3 includes: a moving member 301, which is a T-shaped structure as a whole, and a rectangular protrusion structure is provided on the rear side of the moving member 301, a threaded through hole is provided in the rectangular protrusion structure, two groups of rotating shafts are provided at the front end of the moving member 301, and an ultrasonic transmitter is provided at the top of the moving member 301; a fixed groove 3011, which is a "cross" shaped groove, and there are two groups of fixed grooves 3011, and the fixed grooves 3011 are provided at the front side of the upper end of the moving member 301, and the fixed grooves 3011 run through the top of the moving member 301; a guide gear 3012, which is provided with two groups, and the guide gear 3012 is sleeved on the rotating shaft at the front end of the moving member 301; a slider 302, which is a "cross" shaped structure, and the slider 302 is provided with Two groups, the sliders 302 are symmetrically arranged inside the fixed groove 3011, and an elastic member is arranged between the slider 302 and the fixed groove 3011; the contact plate 3021 is an L-shaped plate structure, and a wedge-shaped structure is arranged on the top of the contact plate 3021. The contact plate 3021 is arranged on the top of the slider 302. The movable member 301 is arranged to install the ultrasonic transmitter and drive the ultrasonic transmitter to perform mobile detection. The fixed groove 3011 is arranged to slide the slider 302. The guide gear 3012 is arranged to facilitate the movement of the movable member 301. The slider 302 is arranged to drive the contact plate 3021 to clamp the display by cooperating with the elastic member. The contact plate 3021 is arranged to fix the display.

[0061] As another implementation mode of the embodiment of the present invention, a placement groove can be opened on the top of the movable part 301 when in use, and two sets of clips can be installed in the placement groove through elastic parts, so that when the device is in use, the clips can be pulled to both sides and the display can be placed between the two sets of clips for fixation.

[0062] like Figure 5As shown, the fixing mechanism 4 includes: a fixing frame 401, which is a square plate-like structure, and two groups of L-shaped fixing plates are provided at the upper end of the fixing frame 401, and bolt holes are provided inside the fixing frame 401; a slide groove 4011, which is a triangular groove, and the slide groove 4011 is opened on the inner side of the L-shaped fixing plate at the upper end of the fixing frame 401; a top plate 402, which is an arc-shaped plate-like structure, and the top plate 402 is provided at the upper end of the fixing frame 401, and two groups of triangular protrusion structures are provided on the front side of the top plate 402, and the triangular protrusions are clamped in the slide groove 4011, and six groups of cylindrical grooves are provided at the upper end of the top plate 402; an adjusting screw 4021, which is rotatably installed at the bottom of the top plate 402, and the adjusting screw 4021 and the fixing frame 401 is threadedly connected; the spring block 4022 is a cylindrical structure, and a rotatable ball is embedded in the upper end of the spring block 4022. The spring block 4022 is inserted into the cylindrical groove at the upper end of the top plate 402, and an elastic member is provided between the spring block 4022 and the cylindrical groove. A fixing frame 401 is provided to fix the main body 101, a slide groove 4011 is provided to guide when the top plate 402 moves, and the top plate 402 is provided to fix the main body 101 by contacting with the pipe wall. An adjusting screw 4021 is provided to adjust the movement of the top plate 402. A spring block 4022 is provided, and a ball is embedded in the spring block 4022, so that the fixing mechanism 4 can be conveniently adjusted in angle.

[0063] The specific usage and function of this embodiment are as follows:

[0064] In the novel embodiment of the present invention, a bottom groove 1013 is provided at the lower end of the main body 101, the fixing frame 401 is fixed in the bottom groove 1013 by bolts, an adjusting screw 4021 is rotatably installed at the bottom of the top plate 402, the adjusting screw 4021 is threadedly connected to the fixing frame 401, the triangular protrusion on the front side of the top plate 402 is clamped into the slide groove 4011 on the inner side of the fixing frame 401, the pipeline wall is inserted between the main body 101 and the fixing frame 401, the adjusting screw 4021 is rotated, the adjusting screw 4021 drives the top plate 402 to move upward, the top plate 402 is supported against the pipeline wall, and the main body 101 is fixed, a mounting groove 1012 is provided at the inner end of the upper side of the main body 101, the adjusting rod 201 is rotatably installed in the mounting groove 1012, and the moving member 301 is slidably installed in the mounting groove 1012, The movable part 301 is threadedly connected with the adjusting rod 201, and the guide gear 3012 is rotated and installed at the front end of the movable part 301, and the guide gear 3012 is engaged with the rack in the guide groove 1011, so that the movable part 301 can slide on the main body 101, and the ultrasonic transmitter connected with the display is fixed to the movable part 301, and a fixing groove 3011 is opened at the upper end of the movable part 301, and the slider 302 with the contact plate 3021 is slidably installed in the fixing groove 3011, and the display is fixed in the middle position of the four groups of contact plates 3021. When the main body 101 is fixed to the pipeline, the contact plate 3021 is pulled to remove the display, and the adjusting rod 201 is rotated to make the movable part 301 drive the ultrasonic transmitter to move deeper into the pipeline, and the situation inside the pipeline can be detected by observing the display.

[0065] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. An ultrasonic detection device for thermal power pipelines, characterized in that: include: A mounting mechanism (1), the mounting mechanism (1) comprising a main body (101), a guide groove (1011), a mounting groove (1012) and a bottom groove (1013) provided on the main body (101); An adjustment mechanism (2) is arranged in the mounting mechanism (1); an adjustment rod (201) of the adjustment mechanism (2) is rotatably mounted in the mounting groove (1012) of the mounting mechanism (1); the adjustment rod (201) passes through the front side of the main body (101) of the mounting mechanism (1); and an insert (202) is rotatably mounted in a circular through hole at the front end of the main body (101) of the mounting mechanism (1); a circular through hole is arranged inside the insert (202), and circular clamping rings are arranged on both sides of the insert (202); the insert (202) is sleeved on the cylindrical structure at the front end of the adjustment rod (201); A detection mechanism (3) is mounted on the mounting mechanism (1); a moving member (301) of the detection mechanism (3) is slidably mounted in the mounting groove (1012); the moving member (301) is threadedly connected to the adjustment rod (201); and the guide gear (3012) is engaged with the rack in the guide groove (1011); the guide gear (3012) is sleeved on the rotating shaft at the front end of the moving member (301); A fixing mechanism (4) is arranged at the bottom of the mounting mechanism (1), and a fixing frame (401) of the fixing mechanism (4) is fixed to the bottom groove (1013) by means of bolts; The mounting mechanism (1) comprises: The main body (101) is an L-shaped long strip structure as a whole, and eight groups of spherical grooves are provided at the lower end of the main body (101), and balls are rotatably installed in the spherical grooves; The guide groove (1011) is a rectangular groove, and the guide groove (1011) is opened in the middle position of the main body (101), and a rack is arranged in the guide groove (1011); The mounting groove (1012) is a rectangular groove, and the mounting groove (1012) is arranged on the inner side of the upper end of the main body (101); The bottom groove (1013) is a rectangular groove, and a fixing screw hole is arranged in the bottom groove (1013). There are two groups of bottom grooves (1013) in total, and the bottom grooves (1013) are arranged at the front side of the lower end of the main body (101).

2. The ultrasonic detection device for thermal power pipelines according to claim 1, characterized in that: The regulating mechanism (2) comprises: The adjusting rod (201) is a cylindrical structure, and a thread is provided on the outer side of the adjusting rod (201), and a cylindrical structure is provided at the front end of the adjusting rod (201), and a handle is provided at the front end of the cylindrical structure; The embedded part (202) is a cylindrical structure.

3. The ultrasonic detection device for thermal power pipelines according to claim 1, characterized in that: The detection mechanism (3) comprises: The moving member (301) is of T-shaped structure as a whole, and a rectangular protrusion structure is provided at the rear side of the moving member (301), a threaded through hole is provided in the rectangular protrusion structure, two sets of rotating shafts are provided at the front end of the moving member (301), and an ultrasonic transmitter is provided at the top end of the moving member (301); The fixing groove (3011) is a "cross" shaped groove, and there are two groups of the fixing grooves (3011) in total. The fixing grooves (3011) are arranged at the front side of the upper end of the moving member (301), and the fixing grooves (3011) penetrate the top of the moving member (301); Guide gears (3012), there are two sets in total; The slider (302) is a "cross" shaped structure. Two groups of sliders (302) are provided. The sliders (302) are symmetrically arranged inside the fixing groove (3011). An elastic member is provided between the slider (302) and the fixing groove (3011). The contact plate (3021) is an L-shaped plate structure, and a wedge-shaped structure is provided on the top of the contact plate (3021). The contact plate (3021) is provided on the top of the slider (302).

4. The ultrasonic detection device for thermal power pipelines according to claim 3, characterized in that: The top of the movable member (301) is provided with a placement groove, and two groups of clips are installed in the placement groove via elastic members. When in use, the clips are pulled toward both sides and the ultrasonic transmitter is placed between the two groups of clips for fixation.

5. The ultrasonic detection device for thermal power pipelines according to claim 1, characterized in that: The fixing mechanism (4) comprises: The fixing frame (401) is a square plate-shaped structure, and two groups of L-shaped fixing plates are provided at the upper end of the fixing frame (401), and bolt holes are provided inside the fixing frame (401); The slide groove (4011) is a triangular groove, and the slide groove (4011) is provided on the inner side of the L-shaped fixing plate at the upper end of the fixing frame (401); The top plate (402) is an arc-shaped plate-like structure, and the top plate (402) is arranged on the upper end of the fixing frame (401), and two groups of triangular protrusion structures are arranged on the front side of the top plate (402), the triangular protrusions are clamped in the slide groove (4011), and six groups of cylindrical grooves are arranged on the upper end of the top plate (402); An adjusting screw (4021) is rotatably mounted on the bottom of the top plate (402), and the adjusting screw (4021) is threadedly connected to the fixing frame (401); The spring block (4022) is a cylindrical structure, and a rotatable ball is embedded in the upper end of the spring block (4022). The spring block (4022) is inserted into the cylindrical groove at the upper end of the top plate (402), and an elastic member is provided between the spring block (4022) and the cylindrical groove.

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