A tongue-and-groove pipe lifting fixture and a lifting method

Abstract

The present invention discloses a tongue-and-groove pipe hoisting fixture and a hoisting method, which includes a hanger body. There are two hanger bodies, and their tops are connected by an opening and closing shaft. An anti-tongue-and-groove pipe protection structure is installed inside the hanger body. The fixture further includes a locking structure installed between the tops of the two hanger bodies. When the hanger body hoists the tongue-and-groove pipe, the locking structure locks the hanger body and keeps it in a stable state. When hoisting the tongue-and-groove pipe, first open the two hanger bodies, then close the two hanger bodies towards the middle, and after they are adapted and locked with the limit pins and the positioning holes, the closing action at the bottoms of the two hanger bodies is completed at this time. The tongue-and-groove pipe is safely hoisted to the predetermined position by a hoisting device, effectively solving the existing technical problems.

Description

Technical Field

[0001] The present invention belongs to the field of municipal pipeline installation, and particularly relates to a socket pipe hoisting fixture and a hoisting method. Background Art

[0002] Concrete pipes are widely used as one of the main materials for drainage projects. The factory length of concrete pipes is limited (usually 2 meters), but the pipeline laying in the design is long-distance. Therefore, during the construction process, it often occurs that the pipeline length is insufficient and it is necessary to hoist and assemble to extend the pipeline. Concrete pipes are heavy and cannot be manually moved into place. Usually, the following methods are used to install concrete pipes:

[0003] 1. Using a steel wire rope as a sling, the concrete pipe is circumferentially surrounded by the steel wire rope in the middle along the length direction, and the pipe joint is locked with a buckle.

[0004] 2. The crane hoists the other end of the steel wire rope and moves the pipe joint to the position to be installed.

[0005] 3. Workers cooperate with the crane to hoist the pipeline into place.

[0006] 4. Loosen the buckle, and the crane pulls out the steel wire rope from the bottom of the pipe.

[0007] This method is the simplest but has low efficiency. First, it is necessary for workers to surround the steel wire rope from the bottom of the pipe and lock the pipe joint with a buckle. After the pipeline is installed in place, workers need to climb to the back of the pipe to release the buckle, which is inefficient and dangerous. Second, when the crane pulls out the steel wire rope, it is easy to drag the pipeline, resulting in lateral displacement of the installed pipeline and installation failure; when the pipeline is displaced, it is easy to squeeze workers, and the safety is poor. Summary of the Invention

[0008] In order to solve the above technical problems, the inventor has obtained the technical solution of the present invention through practice and summary. The present invention discloses a socket pipe hoisting fixture, which includes a hanger body. There are two hanger bodies and their moving directions are opposite. An socket pipe protection structure is installed inside the hanger body. The fixture further includes a locking structure installed between the tops of the two hanger bodies. When the hanger body hoists the socket pipe, the locking structure locks the hanger body and keeps it in a stable state.

[0009] The following improvements are made to the above solution. There are two hanger bodies and their tops are connected by a hinge shaft. The locking structure includes positioning holes provided at the tops of the hanger bodies and limit pins installed in the positioning holes corresponding to the two positions.

[0010] The following improvements are made to the above solution. The socket pipe protection structure is a flexible rubber strip.

[0011] The following improvements are made to the above solution. The locking structure includes a mounting frame. A slider connected to the hook of the lifting equipment is installed in the middle of the mounting frame. A guiding roller is installed on the mounting frame below the slider. Guide blocks fixedly installed on the corresponding hanger body are rotatably installed at the bottom of the slider. A stepped shaft with a gradually decreasing diameter from bottom to top is rotatably installed at the top of the slider. The top of the stepped shaft is connected to the hook of the lifting equipment. A limiting hole adapted to the large diameter of the stepped shaft and a guiding groove communicated with the limiting hole and adapted to the small diameter of the stepped shaft are provided on the mounting frame above the slider.

[0012] The following improvements are made to the above solution. A guiding arc surface is provided on one side of the guide block opposite to the guiding roller. The width between the tops of the two guiding arc surfaces is smaller than the width between the bottoms.

[0013] The following improvements are made to the above solution. The locking structure includes a lifting main body. Two symmetrically arranged connecting rods I are rotatably installed on both sides of the lifting main body. The two connecting rods I can slide left and right relative to the lifting main body. The free ends of the two connecting rods I are jointly rotatably connected to a lifting sub-body connected to the hook of the lifting equipment. A connecting rod II rotatably installed on the corresponding hanger body is rotatably installed at the rotation node of the lifting sub-body and the connecting rod I.

[0014] The following improvements are made to the above solution. A stepped shaft with a gradually decreasing diameter from bottom to top is rotatably installed at the top of the lifting sub-body. The top of the stepped shaft is connected to the hook of the lifting equipment. A limiting hole adapted to the large diameter of the stepped shaft and a guiding groove communicated with the limiting hole and adapted to the small diameter of the stepped shaft are provided on the lifting main body above the lifting sub-body.

[0015] The following improvements are made to the above solution. The socket pipe protection structure includes at least one row of nylon rollers provided at a position slightly below the waist of the hanger body. The rolling direction of the nylon rollers is parallel to the axis of the socket pipe.

[0016] A hoisting method for a socket pipe hoisting clamp is as follows:

[0017] First, the lifting equipment is hoisted above the socket pipe through the hook device. The hook and the device are lowered. When the guide block contacts the socket pipe, it will open outward. At the same time, the slider will move downward relative to the mounting frame until the stepped shaft rotates from the large diameter to the small diameter and is located inside the limiting hole.

[0018] Second, continue to lower the hook and the device. After the hanger body moves downward to the predetermined position, at this time, the nylon rollers at the bottom of the mounting frame contact the socket pipe.

[0019] Third, the hook is driven to move upward by the lifting equipment. Subsequently, the slider will first move upward relative to the hanger body. The slider will drive the hanger body to close in the middle through the guide block, completing the closing action of the bottoms of the two hanger bodies.

[0020] Finally, the lifting equipment drives the socket pipe to move left and right through the hook to adjust its installation position and lower it to the predetermined installation position. Lower the hook and the device until the bottom nylon rollers of the installation frame contact the socket pipe. Continue to lower the hook, and the lifting sub-body will move downward relative to the lifting main body until the stepped shaft rotates from the large diameter to the small diameter and is located inside the limit hole. The two hanger bodies will open to both sides. Then move the hook forward / backward to drive the small diameter into the guide groove, and continue to move until the hanger body is completely separated from the socket pipe.

[0021] A lifting method for a socket pipe lifting clamp, and the lifting steps are as follows:

[0022] First, the lifting equipment is lifted above the socket pipe through the hook device. Lower the hook and the device. When the hanger body contacts the socket pipe, it will open outward. At the same time, the lifting sub-body will move downward relative to the lifting main body until the stepped shaft rotates from the large diameter to the small diameter and is located inside the limit hole.

[0023] Second, continue to lower the hook and the device. When the hanger body moves downward to the predetermined position, at this time, the bottom nylon rollers of the lifting main body contact the socket pipe.

[0024] Third, drive the hook to move upward through the lifting equipment. Subsequently, the lifting sub-body will first move upward relative to the lifting main body. The lifting sub-body will drive the first connecting rod and the second connecting rod to rotate towards the middle, and the hanger body will follow and close towards the middle, completing the closing action at the bottom of the two hanger bodies.

[0025] Finally, the lifting equipment drives the socket pipe to move left and right through the hook to adjust its installation position and lower it to the predetermined installation position. Lower the hook and the device until the bottom nylon rollers of the lifting main body contact the socket pipe. Continue to lower the hook, and the lifting sub-body will move downward relative to the lifting main body until the stepped shaft rotates from the large diameter to the small diameter and is located inside the limit hole. The two hanger bodies will open to both sides. Then move the hook forward / backward to drive the small diameter into the guide groove, and continue to move until the hanger body is completely separated from the socket pipe.

[0026] Compared with the prior art, the present invention can obtain the following technical effects:

[0027] 1. Compared with the prior art, in the technical solution of the present invention, when lifting the socket pipe, first open the two hanger bodies, and then close the two hanger bodies towards the middle and lock them after the limit pins are adapted to the positioning holes. At this time, the closing action at the bottom of the two hanger bodies is completed, and the socket pipe is safely lifted to the predetermined position by the lifting equipment, effectively solving the existing technical problems.

[0028] 2. Compared with the prior art, in the process of the lifting device driving the stepped shaft to penetrate the limiting holes on the mounting brackets with small and large diameters, the lifting frame body will be driven upward by the slider. During the upward movement, the socket pipe will be clamped towards the middle first, and then it will move upward a short distance together with the slider, so that the two lifting frame bodies can stably maintain a vertical state. At this time, the closing action of the bottoms of the two lifting frame bodies is completed, and the safety is relatively high. When reaching the predetermined position, the mounting bracket is supported on the socket pipe at this time. Subsequently, the hook of the lifting device drives the slider to move downward, causing the slider to move downward. The small diameter of the stepped shaft is located inside the limiting hole. During the downward movement of the slider, the left-right stable state of the lifting frame body is released, and there is only a released state between the socket pipe and the lifting frame body, without a clamping state. By moving the hook forward / backward, the small diameter of the stepped shaft enters the guiding groove, so that there is always no clamping state between the lifting frame body and the socket pipe until the lifting frame body is completely separated from the socket pipe, with high safety and no damage to the socket pipe, and the position of the socket pipe will not shift.

[0029] 3. Compared with the prior art, the lifting device hoists the device above the socket pipe and then lowers the device. When the lifting frame body contacts the socket pipe, it will open outward. At the same time, the lifting auxiliary body will move downward relative to the lifting main body, causing the small diameter of the stepped shaft to be located inside the limiting hole. When the lifting frame body descends to the predetermined position (at this time, the lifting main body contacts the socket pipe), the lifting auxiliary body will be driven to move upward by the upward movement of the lifting device, and then drive the first connecting rod and the second connecting rod to rotate towards the middle, completing the closing action of the bottoms of the two lifting frame bodies. When the top of the lifting auxiliary body abuts against the lower part of the lifting main body, the device and the socket pipe are in a stable state. During this process, the large diameter of the stepped shaft will fit inside the limiting hole. When hoisted to the predetermined position, the lifting device lowers the device again until the lifting main body contacts the socket pipe, and then continues to lower. During the lowering process, the stepped shaft changes from the large diameter to the small diameter and is located inside the limiting hole. The lifting frame body and the socket pipe are only in contact, and there is no radial clamping force between them. Subsequently, move the hook of the lifting device forward / backward, causing the small diameter of the stepped shaft to enter the guiding groove, and continue to move the hook until the lifting frame body is completely separated from the socket pipe, with high safety and no damage to the socket pipe, and the position of the socket pipe will not shift. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0032] Figure 2 This is the overall structural operating diagram of Example 1 of the present invention;

[0033] Figure 3 This is the overall structural operating diagram of Example 2 of the present invention;

[0034] Figure 4 It is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0035] Figure 5 This is the overall structural operating diagram of Example 3 of the present invention;

[0036] Figure 6 It is a schematic diagram of the overall structure of Example 3 of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] The application principle of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] like Figure 1 and Figure 2 As shown, a tongue-and-groove pipe hoisting fixture includes a hanger body 10, two hanger bodies 10 are provided, and the tops of the two hanger bodies 10 are connected by an opening and closing shaft to achieve the effect of opposite movement directions. A tongue-and-groove pipe protection structure 20 is installed on the inner side of the hanger body 10, and the tongue-and-groove pipe protection structure 20 is a flexible rubber strip. The fixture also includes a locking structure installed between the tops of the two hanger bodies 10. When the hanger body 10 lifts the tongue-and-groove pipe, the locking structure locks the hanger body 10 and is in a stable state. The locking structure includes a positioning hole 11 set at the top of the hanger body 10, and a limit pin 12 installed in the positioning holes 11 corresponding to the two positions. When hoisting the tongue-and-groove pipe, first open the two hanger bodies 10, then tighten the two hanger bodies 10 toward the middle and lock them after the limit pin 12 is adapted to the positioning hole 11. At this time, the closing action of the bottom of the two hanger bodies 10 is completed, and the tongue-and-groove pipe is safely hoisted to a predetermined position by a hoisting device, effectively solving the existing technical problems.

[0041] Example 2

[0042] like Figure 3 and Figure 4As shown, different from the locking structure in Embodiment 1, the two hanger bodies can also achieve the opposite effect of the movement direction through the locking structure. The locking structure includes a mounting frame 30. A slider 31 connected to the hook of the lifting equipment is installed in the middle of the mounting frame 30. A guiding roller 32 is installed on the mounting frame 30 below the slider 31. Guide blocks 33 fixedly installed with the corresponding hanger bodies 10 are rotatably installed at the bottom of the slider 31. A limiting structure 38 is installed on the mounting frame 30. A stepped shaft 34 with a gradually decreasing diameter from bottom to top is rotatably installed at the top of the slider 31. The top of the stepped shaft 34 is connected to the hook of the lifting equipment. A limiting hole 35 adapted to the large diameter of the stepped shaft 34 and a guiding groove 36 communicated with the limiting hole 35 and adapted to the small diameter of the stepped shaft 34 are provided on the mounting frame 30 above the slider 31. The limiting structure 38 is a limiting block. After the guide block 33 moves up to the highest working position, the left and right positions are limited by the limiting structure 38. When the guide block 33 moves down to contact the nylon roller 37 and the socket pipe, if the guide block 33 continues to move down, it will open to both sides under the action of the guiding roller 32.

[0043] A guiding arc surface is provided on one side of the guide block 33 relative to the guiding roller 32. The width between the tops of the two guiding arc surfaces is smaller than the width between the bottoms.

[0044] A nylon roller 37 is provided at the bottom of the mounting frame 30. The rolling direction of the nylon roller 37 is parallel to the axis of the socket pipe.

[0045] A hoisting method for a socket pipe hoisting clamp is as follows:

[0046] First, the lifting equipment is hoisted above the socket pipe through the hook device. The hook and the device are lowered. When the guide block 33 contacts the socket pipe, it will open outward. At the same time, the slider 31 will move downward relative to the mounting frame 30 until the stepped shaft 34 rotates from the large diameter to the small diameter and is located inside the limiting hole 35.

[0047] Second, continue to lower the hook and the device. After the hanger body 10 moves down to the predetermined position, at this time, the nylon roller 37 at the bottom of the mounting frame 30 contacts the socket pipe.

[0048] Third, the hook is driven to move upward by the lifting equipment. Then, the slider 31 will first move upward relative to the hanger body 10. The slider 31 will drive the hanger body 10 to close in the middle through the guide block 33, completing the closing action of the bottoms of the two hanger bodies 10.

[0049] Finally, the lifting equipment drives the socket pipe to move left and right through the hook to adjust its installation position and lower it to the predetermined installation position. Lower the hook and the device until the bottom nylon roller 37 of the mounting frame 30 touches the socket pipe. Continue to lower the hook, and the lifting sub-body 42 will move downward relative to the lifting main body 40 until the stepped shaft 34 changes from a large diameter to a small diameter and is located inside the limiting hole 35. The two hanger bodies 10 will open to both sides. Then, move the hook forward / backward to drive the small diameter into the guiding groove 36, and continue to move until the hanger body 10 is completely separated from the socket pipe.

[0050] Embodiment 3

[0051] As Figure 5 and Figure 6 shown, different from the locking structure in the above embodiment, the two hanger bodies can also achieve the opposite effect of the movement direction through the locking structure. The locking structure includes a lifting main body 40. On both sides of the lifting main body 40, two symmetrically arranged connecting rods 41 are rotatably installed. The two connecting rods 41 can slide left and right relative to the lifting main body 40. The free ends of the two connecting rods 41 are jointly rotatably connected to a lifting sub-body 42 connected to the hook of the lifting equipment. At the rotation node of the lifting sub-body 42 and the connecting rod 41, a connecting rod 43 rotatably installed with the corresponding hanger body 10 is rotatably installed. At the top of the lifting sub-body 42, a stepped shaft 34 with a gradually decreasing diameter from bottom to top is installed. The top of the stepped shaft 34 is connected to the hook of the lifting equipment. On the lifting main body 40 above the lifting sub-body 42, a limiting hole 35 adapted to the large diameter of the stepped shaft 34 and a guiding groove 36 communicated with the limiting hole 35 and adapted to the small diameter of the stepped shaft 34 are provided. A nylon roller 37 is provided at the bottom of the lifting main body 41, and the rolling direction of the nylon roller 37 is parallel to the axis of the socket pipe.

[0052] A hoisting method for a socket pipe hoisting fixture, and the hoisting steps are as follows:

[0053] First, the lifting equipment is hoisted above the socket pipe through the hook device. Lower the hook and the device. When the hanger body 10 touches the socket pipe, it will open outward. At the same time, the lifting sub-body 42 will move downward relative to the lifting main body 40 until the stepped shaft 34 changes from a large diameter to a small diameter and is located inside the limiting hole 35;

[0054] Secondly, continue to lower the hook and the device. When the hanger body 10 moves downward to the predetermined position, at this time, the bottom nylon roller 37 of the lifting main body 40 touches the socket pipe;

[0055] Thirdly, drive the hook to move upward through the lifting equipment. Subsequently, drive the lifting sub-body 42 to move upward relative to the lifting main body 40 first. The lifting sub-body 42 will drive the connecting rod 41 and the connecting rod 43 to rotate towards the middle, and the hanger body 10 will follow and close towards the middle, completing the closing action at the bottom of the two hanger bodies 10;

[0056] Finally, the lifting equipment drives the spigot pipe to move left and right through the hook to adjust its installation position and lower it to the predetermined installation position. Lower the hook and the device until the bottom nylon roller 37 of the lifting main body 40 touches the spigot pipe. Continue to lower the hook, and the lifting sub-body 42 will move downward relative to the lifting main body 40 until the stepped shaft 34 rotates from the large diameter to the small diameter and is located inside the limit hole 35. The two hanger bodies 10 will open to both sides. Then, move the hook forward / backward to drive the small diameter into the inside of the guide groove 36, and continue to move until the hanger body 10 is completely separated from the spigot pipe.

[0057] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention.

[0058] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tenon pipe hoisting clamp, characterized in that, It includes a hanger body. There are two hanger bodies and their moving directions are opposite. A tongue-and-groove pipe protection structure is installed on the inner side of the hanger body. The fixture also includes a locking structure installed between the tops of the two hanger bodies. When the hanger body hoists the tongue-and-groove pipe, the locking structure locks the hanger body and keeps it in a stable state. The locking structure includes a mounting frame. A slider connected to the hook of the hoisting equipment is installed in the middle of the mounting frame. A guiding roller is installed on the mounting frame below the slider. The bottom of the slider is rotatably installed with guiding blocks fixedly installed with the corresponding hanger bodies respectively. The top of the slider is rotatably installed with a stepped shaft with a gradually decreasing diameter from bottom to top. The top of the stepped shaft is connected to the hook of the hoisting equipment. A limiting hole adapted to the large diameter of the stepped shaft and a guiding groove communicated with the limiting hole and adapted to the small diameter of the stepped shaft are provided on the mounting frame above the slider. A guiding arc surface is provided on one side of the guiding block opposite to the guiding roller. The width between the tops of the two guiding arc surfaces is smaller than the width between the bottoms.

2. The tenon pipe hoisting clamp according to claim 1, characterized in that, Nylon roller wheels are provided at the bottom of the mounting frame. The rolling direction of the nylon roller wheels is parallel to the axis of the tongue-and-groove pipe.

3. A tenon pipe hoisting clamp, characterized in that, It includes a hanger body. There are two hanger bodies and their moving directions are opposite. A tongue-and-groove pipe protection structure is installed on the inner side of the hanger body. The fixture also includes a locking structure installed between the tops of the two hanger bodies. When the hanger body hoists the tongue-and-groove pipe, the locking structure locks the hanger body and keeps it in a stable state. The locking structure includes a hoisting main body. Two symmetrically arranged connecting rods one are rotatably installed on both sides of the top of the hoisting main body. The two connecting rods one can slide left and right relative to the hoisting main body. The free ends of the two connecting rods one are jointly rotatably connected to a hoisting sub-body connected to the hook of the hoisting equipment. A connecting rod two rotatably installed with the corresponding hanger body is rotatably installed at the rotation node of the hoisting sub-body and the connecting rod one. A stepped shaft with a gradually decreasing diameter from bottom to top is rotatably installed at the top of the hoisting sub-body. The top of the stepped shaft is connected to the hook of the hoisting equipment. A limiting hole adapted to the large diameter of the stepped shaft and a guiding groove communicated with the limiting hole and adapted to the small diameter of the stepped shaft are provided on the hoisting main body above the hoisting sub-body.

4. The tenon pipe hoisting clamp according to claim 3, characterized in that, Nylon roller wheels are provided at the bottom of the hoisting main body. The rolling direction of the nylon roller wheels is parallel to the axis of the tongue-and-groove pipe.

5. The tenon pipe hoisting clamp according to claim 1, characterized in that, The tongue-and-groove pipe protection structure is a flexible rubber strip.

6. A hoisting method of the tenon pipe hoisting clamp according to claim 2, characterized in that, The hoisting steps are as follows: First, the hoisting equipment is hoisted above the tongue-and-groove pipe through the hook device. The hook and the device are lowered. When the guiding block contacts the tongue-and-groove pipe, it will open outward. At the same time, the slider will move downward relative to the mounting frame until the stepped shaft rotates from the large diameter to the small diameter and is located inside the limiting hole. Second, continue to lower the hook and the device. When the hanger body moves downward to the predetermined position, at this time, the nylon roller wheels at the bottom of the mounting frame contact the tongue-and-groove pipe. Third, the hook is driven to rise by the hoisting equipment. Then the slider will first move upward relative to the mounting frame. The slider will drive the hanger body to close in the middle through the guiding block, completing the closing action at the bottom of the two hanger bodies. Finally, the hoisting equipment drives the socket pipe to move left and right through the hook to adjust its installation position and lower it to the predetermined installation position. Lower the hook and the device until the bottom nylon roller of the mounting frame touches the socket pipe. Continue to lower the hook, and the slider will move downward relative to the mounting frame until the stepped shaft rotates from the large diameter to the small diameter and is located inside the limit hole. The two hanger bodies will open to both sides. Then move the hook forward / backward to drive the small diameter into the guide groove, and continue to move until the hanger body is completely separated from the socket pipe.

7. A hoisting method of the tenon pipe hoisting clamp according to claim 4, characterized in that, The hoisting steps are as follows: First, the hoisting equipment is lifted above the socket pipe through the hook device. Lower the hook and the device. When the hanger body touches the socket pipe, it will open outward. At the same time, the hoisting sub-body will move downward relative to the hoisting main body until the stepped shaft rotates from the large diameter to the small diameter and is located inside the limit hole. Second, continue to lower the hook and the device. After the hanger body moves downward to the predetermined position, at this time, the bottom nylon roller of the hoisting main body touches the socket pipe. Third, drive the hook to move upward through the hoisting equipment. Then the hoisting sub-body will move upward relative to the hoisting main body first. The hoisting sub-body will drive the first connecting rod and the second connecting rod to rotate towards the middle, and the hanger body will follow and converge towards the middle to complete the closing action at the bottom of the two hanger bodies. Finally, the hoisting equipment drives the socket pipe to move left and right through the hook to adjust its installation position and lower it to the predetermined installation position. Lower the hook and the device until the bottom nylon roller of the hoisting main body touches the socket pipe. Continue to lower the hook, and the hoisting sub-body will move downward relative to the hoisting main body until the stepped shaft rotates from the large diameter to the small diameter and is located inside the limit hole. The two hanger bodies will open to both sides. Then move the hook forward / backward to drive the small diameter into the guide groove, and continue to move until the hanger body is completely separated from the socket pipe.

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