Building water supply and drainage pipeline leakproofness detection device

Abstract

The utility model provides a building water supply and drainage pipeline leakproofness detection device, which belongs to the technical field of pipeline installation, and comprises a sliding assembly, two groups of sealing assemblies, a detection assembly and an inflation device, the upper end of the sliding assembly is used for being connected with hoisting equipment, and the lower end of the sliding assembly is provided with a slideway; the two sealing assemblies are suitable for blocking openings in the two ends of a to-be-detected pipeline. The upper end of the detection assembly is slidably connected with the slideway, the lower end of the detection assembly is suitable for clinging to the outer wall of the pipeline and forming a closed cavity with the outer wall of the pipeline, the gas pressure in the closed cavity is detected to detect the leakage area of the pipeline, and the gas filling device is provided with a gas filling pipe which penetrates through at least one sealing assembly and is suitable for filling gas into the pipeline. The building water supply and drainage pipeline airtightness detection device provided by the utility model has the technical effects that the airtightness of pipelines at different positions can be detected, pipelines with different lengths can be detected, pipeline leakage areas can be detected, and the detection efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline installation, and more specifically relates to a device for detecting the tightness of building water supply and drainage pipelines. Background Art

[0002] Building water supply and drainage pipes are used to transport liquids. They must undergo relevant airtightness tests, such as air and water leak tests, before and after construction. If damage is found in the pipe, causing fluid leakage, remedial measures or replacement of the pipe are necessary. Some existing airtightness testing devices, while capable of testing the overall airtightness of the pipeline, suffer from the inability to detect specific leaking areas. Furthermore, structural flaws in the testing devices themselves prevent pressure gauges from detecting gas leaks in leaking areas.

[0003] Therefore, it is necessary to design a water supply and drainage pipeline tightness detection device that can detect the leakage area of ​​the pipeline. Summary of the Invention

[0004] The purpose of the utility model is to provide a device for detecting the tightness of building water supply and drainage pipes, aiming to solve the technical problem that the leakage area of ​​the pipe cannot be detected when the air tightness of the pipe is detected.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a device for detecting the tightness of water supply and drainage pipes in buildings, comprising:

[0006] A sliding assembly, the upper end of which is used to connect to the lifting equipment, and the lower end of which has a slideway arranged along its length, wherein the length direction of the slideway is arranged parallel to the axial direction of the pipeline to be tested;

[0007] Two sets of sealing assemblies are both slidably connected to the slideway and have the freedom to slide along the length direction of the slideway. The spacing between the two sets of sealing assemblies can be adjusted. The two sets of sealing assemblies are respectively suitable for sealing the openings at both ends of the pipeline to be tested;

[0008] A detection component is located between the two sets of sealing components, with its upper end slidably connected to the slideway and its lower end adapted to closely contact the outer wall of the pipeline and form a closed chamber between the lower end and the outer wall of the pipeline. The detection component detects the gas pressure in the closed chamber to detect the leakage area of ​​the pipeline. The detection component sequentially detects gas leaks at different positions of the pipeline along the sliding direction of the slideway;

[0009] The inflation device comprises an inflation tube which passes through at least one set of the sealing components and is suitable for inflating air into the interior of the pipeline.

[0010] In a possible implementation, the building water supply and drainage pipeline tightness detection device further includes:

[0011] The electric control component is electrically connected to the detection component and the inflation device and is suitable for controlling the operation respectively. The electric control component has a display screen, and the display screen is suitable for displaying the detected gas pressure.

[0012] In a possible implementation, at least one set of the sealing components is connected to a pressure gauge, which is suitable for detecting the gas pressure inside the pipeline.

[0013] In one possible implementation, the sealing assembly includes:

[0014] A first telescopic column is vertically arranged and its upper end is slidably connected to the slideway, and the first telescopic column has a degree of freedom of telescopic extension along its axial direction;

[0015] A plug is detachably connected to the lower end of the first telescopic column, the plug is used to be inserted into the pipeline and block the pipeline, and the inflation tube is set through the plug.

[0016] In a possible implementation, the plug includes:

[0017] a baffle plate, which is in a circular pancake shape and is arranged vertically, with its upper end detachably connected to the lower end of the first telescopic column, and the inner side surface of the baffle plate abutting against the end of the pipe;

[0018] A plug is coaxially connected to a side of the baffle close to the pipeline. The plug is suitable for being inserted into the pipeline and sealing the pipeline. The diameter of the plug is smaller than the diameter of the baffle. The inflation tube passes through the baffle and the plug.

[0019] In a possible implementation, an extension ring is coaxially connected to a side of the plug close to the pipe. The extension ring is suitable for being inserted into the pipe and abutting against the inner wall of the pipe to seal the gap between the pipe and the plug.

[0020] In a possible implementation, a locking screw is provided through the middle of the baffle, a blind hole is provided at the center of the plug, and the locking screw is suitable for being inserted into the blind hole and fixedly connected to the plug.

[0021] In one possible implementation, the detection component includes:

[0022] A second telescopic column is located between the two sets of sealing assemblies, is vertically arranged, and has an upper end slidably connected to the slideway, and the second telescopic column has a degree of freedom of extension and contraction along its axial direction;

[0023] An arc-shaped cover is connected to the lower end of the second telescopic column, the arc direction of the arc-shaped cover is consistent with the arc direction of the outer arc of the pipeline, and the arc-shaped cover is used to cover the outer wall of the pipeline and form the closed chamber between the outer wall of the pipeline;

[0024] A pressure gauge passes through the arc-shaped cover and is used to detect the air pressure inside the closed chamber, and is used to determine whether there is a leakage area based on the air pressure.

[0025] In a possible implementation, the lower end of the second telescopic column is connected to a rotating platform, the lower end of the rotating platform has circumferential rotational freedom, the upper end of the arc cover is connected to the lower end of the rotating platform and the detection position of the pipeline is adjusted with the help of the rotating platform.

[0026] In a possible implementation, the sliding assembly includes:

[0027] A hanging plate, the upper end of which is connected to a plurality of lifting lugs, the lifting lugs being used to connect to the lifting equipment;

[0028] The slide plate is connected in parallel to the bottom of the hanging plate and is spaced apart from the hanging plate. The end of the hanging plate is fixedly connected to the end of the slide plate. The slideway is provided at the lower end of the slide plate, and the length of the slideway is less than the length of the slide plate.

[0029] The beneficial effects of the building water supply and drainage pipe tightness detection device provided by the utility model are as follows: compared with the prior art, the building water supply and drainage pipe tightness detection device of the utility model comprises a sliding component, two sets of sealing components, a detection component and an inflation device, the upper end of the sliding component is used to connect the lifting equipment, and the lower end has a slide arranged along its length direction, and the length direction of the slide is parallel to the axial direction of the pipeline to be tested; the two sets of sealing components are both slidably connected to the slide and have the freedom to slide along the length direction of the slide, the spacing between the two sets of sealing components can be adjusted, and the two sets of sealing components are respectively suitable for sealing the openings at both ends of the pipeline to be tested; the detection component is located between the two sets of sealing components The upper end slides and connects to the slide, and the lower end is suitable for tightly contacting the outer wall of the pipeline and forming a closed chamber between the upper end and the outer wall of the pipeline. The gas pressure in the closed chamber is detected to detect the leakage area of ​​the pipeline. The detection component performs leakage detection on different positions of the pipeline in turn along the sliding direction of the slide; the inflation device has an inflation tube, which passes through at least one group of sealing components and is suitable for inflating air into the inside of the pipeline, solving the technical problem that the leakage area of ​​the pipeline cannot be detected when the air tightness of the pipeline is detected. It has the technical effect of being able to detect the air tightness of pipelines at different positions, being able to detect pipelines of different lengths, being able to detect pipeline leakage areas, and having high detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1A schematic diagram of the structure of a building water supply and drainage pipeline tightness detection device provided by an embodiment of the utility model;

[0032] Figure 2 A schematic diagram of a group of sealing components of a device for detecting the tightness of building water supply and drainage pipes provided by an embodiment of the present utility model;

[0033] Figure 3 for Figure 2 Schematic diagram of the plug structure of the sealing assembly;

[0034] Figure 4 for Figure 3 A schematic diagram of the structure of the sealing assembly after the baffle and the plug are separated;

[0035] Figure 5 A schematic diagram of the structure of a detection component of a building water supply and drainage pipeline tightness detection device provided by an embodiment of the utility model;

[0036] Figure 6 This is a schematic diagram of the state of the building water supply and drainage pipe tightness detection device provided by an embodiment of the utility model after the plug blocks the end of the pipe (the cylindrical structure in the middle of the figure represents the pipe).

[0037] Description of reference numerals:

[0038] 1. Sliding assembly; 11. Slide; 12. Hanging plate; 13. Slide plate; 2. Sealing assembly; 21. First telescopic column; 22. Plug; 221. Baffle; 222. Plug; 223. Extension ring; 224. Locking screw; 3. Detection assembly; 31. Enclosed chamber; 32. Second telescopic column; 33. Arc cover; 34. Rotating table; 4. Electronic control assembly; 5. Inflation tube; 6. Pressure gauge; 7. Slider. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Please also refer to Figures 1 to 6Now, the building water supply and drainage pipeline tightness detection device provided by the utility model is described. The building water supply and drainage pipeline tightness detection device includes a sliding component 1, two groups of sealing components 2, a detection component 3 and an inflation device. The upper end of the sliding component 1 is used to connect to the lifting equipment, and the lower end has a slide 11 arranged along its length, and the length direction of the slide 11 is parallel to the axial direction of the pipeline to be tested; the two groups of sealing components 2 are both slidably connected to the slide 11 and have the freedom to slide along the length direction of the slide 11. The spacing between the two groups of sealing components 2 can be adjusted, and the two groups of sealing components 2 are respectively suitable for sealing the openings at both ends of the pipeline to be tested; the detection component 3 is located between the two groups of sealing components 2, the upper end is slidably connected to the slide 11, and the lower end is suitable for being close to the outer wall of the pipeline and forming a closed chamber 31 between the outer wall of the pipeline. The gas pressure in the closed chamber 31 is detected to detect the pipeline leakage area, and the detection component 3 performs leakage detection on different positions of the pipeline in turn along the sliding direction of the slide 11; the inflation device has an inflation tube 5, the inflation tube 5 passes through at least one group of sealing components 2 and is suitable for inflating the inside of the pipeline.

[0041] Compared with the prior art, the device for detecting the tightness of building water supply and drainage pipes provided by the present invention can detect the airtightness of pipes at different positions, detect pipes of different lengths, and detect the leakage areas of pipes by means of a lifting device (not shown in the figure) such as a crane, so as to slide the two sets of sealing components 2 on the slide 11, thereby sealing pipes of different lengths. The device can detect the leakage areas on the pipes through the detection component 3 to find the leakage location, thereby solving the technical problem that the leakage areas of pipes cannot be detected during the air tightness detection of pipes. The device has the technical effects of being able to detect the air tightness of pipes at different positions, being able to detect pipes of different lengths, being able to detect the leakage areas of pipes, and having high detection efficiency.

[0042] The inflation device used in this embodiment can adopt existing technology products, which can inflate the inside of the pipeline so that the air pressure inside the pipeline is greater than the atmospheric pressure. By using the detection component 3, it can be detected whether there is a leakage area on the pipeline, thereby judging whether the pipeline is a qualified product or whether the pipeline can be used in construction.

[0043] In some embodiments, see Figures 1 to 6 The building water supply and drainage pipeline tightness detection device also includes an electronic control component 4, which is electrically connected to the detection component 3 and the inflation device and is suitable for controlling their respective operations. The electronic control component 4 has a display screen suitable for displaying the detected gas pressure. The electronic control component 4 includes a control panel, a PLC controller, a control circuit, and multiple control buttons. Through the electrical connection with the detection component 3 and the inflation device, the electronic control component 4 can be controlled to operate separately, thereby realizing the functions of automatically inflating the pipeline and controlling the inflation pressure, which facilitates the detection of the detection component 3. If a gas leak occurs in the pipeline, the gas pressure value can be displayed on the display screen, thereby determining whether there is a gas leak area.

[0044] To determine the internal pressure value of the pipe after inflation, in some embodiments, refer to Figure 3 At least one sealing assembly 2 is connected to a pressure gauge 6, which is suitable for detecting the gas pressure inside the pipeline. This pressure gauge 6 is an electronic pressure gauge 6, which can be electrically connected to the electronic control assembly 4 and can send the detected pressure value to the electronic control assembly 4. The electronic control assembly 4 can view the current pressure value and determine whether to continue to inflate the pipeline.

[0045] In some embodiments, see Figures 1 to 4 The sealing assembly 2 includes a first telescopic column 21 and a plug 22. The first telescopic column 21 is arranged vertically and its upper end is slidably connected to the slide 11. The first telescopic column 21 has the freedom of extension and contraction along its axial direction; the plug 22 is detachably connected to the lower end of the first telescopic column 21. The plug 22 is used to be inserted into the pipeline and seal the pipeline. The inflation tube 5 is set through the plug 22. When the plug 22 is installed inside the pipeline, the end of the pipeline is sealed to prevent the gas inside the pipeline from leaking. The closed space inside the pipeline is conducive to judging the air pressure and detecting the leakage area. By adjusting the spacing between the two groups of first telescopic columns 21, the spacing between the two groups of plugs 22 can be adjusted, so that pipelines of different lengths can be sealed to perform airtightness testing on pipelines of different lengths. The height of the plug 22 can be adjusted by the extension and contraction of the first telescopic column 21 to seal pipelines at different positions or heights.

[0046] In some embodiments, see Figures 1 to 4 The plug 22 includes a baffle 221 and a plug 222. The baffle 221 is circular and vertically arranged. Its upper end is detachably connected to the lower end of the first telescopic column 21. The inner side of the baffle 221 abuts the end of the pipe. The plug 222 is coaxially connected to the side of the baffle 221 near the pipe. The plug 222 is suitable for inserting into the pipe and sealing the pipe. The diameter of the plug 222 is smaller than that of the baffle 221. The inflation tube 5 is installed through the baffle 221 and the plug 222. The diameter of the baffle 221 is larger than that of the plug 222. When the plug 222 is placed in the pipe, the baffle 221 can also play a certain role in blocking the pipe, that is, the inner side of the baffle 221 abuts the end of the pipe. The diameter of the plug 222 and the inner diameter of the pipe are mutually matched and plugged, forming an interference fit connection, which can prevent gas from leaking between the plug 222 and the pipe. When the plug 222 is placed in the pipeline, the first telescopic column 21 can be braked on the slide 11, which also limits the plug 222 from slipping out of the pipeline.

[0047] To further prevent air leakage, in some embodiments, refer to Figures 1 to 4An extension ring 223 is coaxially connected to the side of the plug 222 near the pipe. The extension ring 223 is adapted to be inserted into the pipe and abut against the inner wall of the pipe to seal the gap between the pipe and the plug 222. The extension ring 223 is longer than the plug 222 and is made of a flexible or elastic rubber material. When placed inside the pipe, it can seal the gap between the pipe and the plug 222, further enhancing the sealing effect.

[0048] In order to be able to block pipes of different diameters, in some embodiments, see Figures 1 to 4 A locking screw 224 is provided in the middle of the baffle 221, and a blind hole is provided in the center of the plug 222. The locking screw 224 is adapted to be inserted into the blind hole and fixedly connected to the plug 222. The size of the plug 222 is interchangeable. By removing the locking screw 224, the plug 222 can be removed from the baffle 221 and replaced with a plug 222 of other specifications or sizes to adapt to the sealing of pipes of different diameters.

[0049] In some embodiments, see Figure 1 and Figure 5 The detection assembly 3 includes a second telescopic column 32, an arc cover 33, and a pressure gauge 6. The second telescopic column 32 is located between the two sets of sealing assemblies 2. It is vertically arranged and its upper end is slidably connected to the slide 11. The second telescopic column 32 has the freedom to expand and contract along its axial direction. The arc cover 33 is connected to the lower end of the second telescopic column 32. The arc direction of the arc cover 33 is consistent with the arc direction of the outer arc of the pipeline. The arc cover 33 is used to cover the outer wall of the pipeline and form a closed chamber 31 between the outer wall of the pipeline. The pressure gauge 6 passes through the arc cover 33 and is used to detect the air pressure inside the closed chamber 31. The air pressure is used to determine whether there is a leak area. The arc cover 33 is semicircular and can detect half of the circumferential range of the pipeline. When the other half needs to be detected, the pipeline can be rotated appropriately in the circumferential direction. After detecting one position, the second telescopic column 32 can be moved, and the other positions of the pipeline can be detected. The end of the curved cover 33 has a protrusion. When the protrusion contacts or abuts the pipe wall, it forms a closed chamber 31 between the interior of the curved cover 33 and the pipe wall. If there is a leak in the pipe, gas will be input into the closed chamber 31. At this time, the pressure gauge can detect whether there is a leak at that location. An increase in air pressure indicates an area with a leak. Multiple pressure gauges 6 can be provided, arranged along the curved direction of the curved cover 33, so that the air pressure at different locations can be separately detected. The pressure gauge 6 is also electrically connected to the electronic control component 4 and can display the pressure value on the display screen.

[0050] Preferably, a plurality of partitions (not shown in the figure) can be arranged at intervals along the arc direction inside the arc cover 33. The plurality of partitions divide the closed chamber 31 into a plurality of small chambers. Each pressure gauge 6 is correspondingly inserted between two adjacent partitions. Then, each pressure gauge 6 can perform a separate detection of the air pressure inside the plurality of small chambers, so as to accurately determine the air pressure values ​​at different positions on the pipeline and more accurately determine the leakage area.

[0051] Specifically, the above-mentioned first telescopic column 21 and the second telescopic column 32 have the same structure, and three sliders 7 are slidably connected on the slide 11. The two groups of first telescopic columns 21 and second telescopic columns 32 are correspondingly connected to two sliders 7, and the second telescopic column 32 is located between the two first telescopic columns 21. The above-mentioned telescopic columns are all existing technology products, are electrically connected to the electronic control component 4, and are controlled by the electronic control component 4 during operation.

[0052] In order to detect air leaks in pipes at different locations or in different orientations, in some embodiments, refer to Figure 1 and Figure 5 The lower end of the second telescopic column 32 is connected to a rotating platform 34, which has circumferential rotational freedom. The upper end of the arc cover 33 is connected to the lower end of the rotating platform 34, and the rotating platform 34 is used to adjust the inspection position of the pipeline. The rotating platform 34 is electrically connected to the electronic control component 4 and its operation is controlled by the electronic control component 4. By controlling the rotation of the rotating platform 34, the rotation direction of the arc cover 33 can be adjusted, thereby enabling pipeline inspection. The rotating platform 34 is a conventional electric rotating platform.

[0053] In some embodiments, see Figure 1 The sliding assembly 1 includes a hanging plate 12 and a slide plate 13. The upper end of the hanging plate 12 is connected to a plurality of lifting ears for connecting to lifting equipment. The slide plate 13 is connected parallel to the lower portion of the hanging plate 12 and is spaced apart from the hanging plate 12. The ends of the hanging plate 12 and the slide plate 13 are fixedly connected. The slideway 11 is provided at the lower end of the slide plate 13, and the length of the slideway 11 is shorter than that of the slide plate 13. A jackscrew can be provided between the hanging plate 12 and the slide plate 13. The jackscrew passes through the slide plate 13 and can abut against the slider 7 to lock and secure the first telescopic column 21 or the second telescopic column 32 to the slideway 11. In actual use, the jackscrew can be used appropriately according to actual conditions to achieve locking and securing of the telescopic column.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A building water supply and drainage pipeline tightness detection device, characterized in that: include: A sliding assembly, the upper end of which is used to connect to the lifting equipment, and the lower end of which has a slideway arranged along its length, wherein the length direction of the slideway is arranged parallel to the axial direction of the pipeline to be tested; Two sets of sealing assemblies are both slidably connected to the slideway and have the freedom to slide along the length direction of the slideway. The spacing between the two sets of sealing assemblies can be adjusted. The two sets of sealing assemblies are respectively suitable for sealing the openings at both ends of the pipeline to be tested; A detection component is located between the two sets of sealing components, with its upper end slidably connected to the slideway and its lower end adapted to closely contact the outer wall of the pipeline and form a closed chamber between the lower end and the outer wall of the pipeline. The detection component detects the gas pressure in the closed chamber to detect the leakage area of ​​the pipeline. The detection component sequentially detects gas leaks at different positions of the pipeline along the sliding direction of the slideway; The inflation device comprises an inflation tube which passes through at least one set of the sealing components and is suitable for inflating air into the interior of the pipeline.

2. The building water supply and drainage pipeline tightness detection device according to claim 1, characterized in that: Also includes: The electric control component is electrically connected to the detection component and the inflation device and is suitable for controlling the operation respectively. The electric control component has a display screen, and the display screen is suitable for displaying the detected gas pressure.

3. The building water supply and drainage pipeline tightness detection device according to claim 1, characterized in that: At least one set of the sealing components is connected to a pressure gauge, which is suitable for detecting the gas pressure inside the pipeline.

4. The building water supply and drainage pipeline tightness detection device according to claim 1, characterized in that: The sealing assembly comprises: A first telescopic column is vertically arranged and its upper end is slidably connected to the slideway, and the first telescopic column has a degree of freedom of telescopic extension along its axial direction; A plug is detachably connected to the lower end of the first telescopic column, the plug is used to be inserted into the pipeline and block the pipeline, and the inflation tube is set through the plug.

5. The building water supply and drainage pipeline tightness detection device according to claim 4, characterized in that: The plug includes: a baffle plate, which is in a circular pancake shape and is arranged vertically, with its upper end detachably connected to the lower end of the first telescopic column, and the inner side surface of the baffle plate abutting against the end of the pipe; A plug is coaxially connected to a side of the baffle close to the pipeline. The plug is suitable for being inserted into the pipeline and sealing the pipeline. The diameter of the plug is smaller than the diameter of the baffle. The inflation tube passes through the baffle and the plug.

6. The building water supply and drainage pipeline tightness detection device according to claim 5, characterized in that: An extension ring is coaxially connected to a side surface of the plug close to the pipeline. The extension ring is suitable for being inserted into the pipeline and abutting against the inner wall of the pipeline to seal the gap between the pipeline and the plug.

7. The building water supply and drainage pipeline tightness detection device according to claim 5, characterized in that: A locking screw is provided in the middle of the baffle, and a blind hole is provided in the center of the plug. The locking screw is suitable for being inserted into the blind hole and fixedly connected with the plug.

8. The building water supply and drainage pipeline tightness detection device according to claim 1, characterized in that: The detection component includes: A second telescopic column is located between the two sets of sealing assemblies, is vertically arranged, and has an upper end slidably connected to the slideway, and the second telescopic column has a degree of freedom of extension and contraction along its axial direction; An arc-shaped cover is connected to the lower end of the second telescopic column, the arc direction of the arc-shaped cover is consistent with the arc direction of the outer arc of the pipeline, and the arc-shaped cover is used to cover the outer wall of the pipeline and form the closed chamber between the outer wall of the pipeline; A pressure gauge passes through the arc-shaped cover and is used to detect the air pressure inside the closed chamber, and is used to determine whether there is a leakage area based on the air pressure.

9. The building water supply and drainage pipeline tightness detection device according to claim 8, characterized in that: The lower end of the second telescopic column is connected to a rotating platform, and the lower end of the rotating platform has circumferential rotation freedom. The upper end of the arc cover is connected to the lower end of the rotating platform and the detection position of the pipeline is adjusted with the help of the rotating platform.

10. The building water supply and drainage pipeline tightness detection device according to claim 1, characterized in that: The sliding assembly comprises: A hanging plate, the upper end of which is connected to a plurality of lifting lugs, the lifting lugs being used to connect to the lifting equipment; The slide plate is connected in parallel to the bottom of the hanging plate and is spaced apart from the hanging plate. The end of the hanging plate is fixedly connected to the end of the slide plate. The slideway is provided at the lower end of the slide plate, and the length of the slideway is less than the length of the slide plate.

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