Water ring granulation dehydration system for plastic production

Abstract

The utility model relates to the technical field of plastic processing, and discloses a water ring granulation dehydration system for plastic production, which comprises a main body assembly and a dehydrator, a discharge port is fixed on one side of the dehydrator, a feed port is fixed on the other side of the dehydrator, a base is fixed at the bottom of the dehydrator, and a loading assembly is arranged on the base and is used for loading the water ring granulation dehydration system. Comprising a loading part, the loading part comprises a supporting frame, and the supporting frame is fixed to the top of the base. The utility model has the beneficial effects that when the material receiving operation is carried out, the woven bag can be fixed by using the bracket to ensure that the position of the woven bag is stable, so that plastic particles flowing out of the discharge port can be received more smoothly, and when the woven bag is gradually filled up, the sealing cover at the discharge port can be automatically started to seal the discharge port, so that the material receiving operation is very convenient. And therefore, the plastic particles are effectively prevented from continuously flowing out, and the situations of particle scattering and the like caused by insufficient material receiving are prevented.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing technology, and in particular to a water ring granulation and dehydration system for plastic production. Background Technology

[0002] Water ring granulation and dehydration in plastic production utilizes a water ring granulation and dehydration system. Moisture-containing plastic granules enter a specific chamber, where the water rings, centrifugal force, friction, and particle collision and compression work together to remove moisture from the granules, reducing their moisture content and meeting subsequent production requirements. Vertical dehydrators use internal rotating components to generate centrifugal force, effectively removing moisture from the surface of the plastic granules. After dehydration, the machine discharges the granules. Operators stand at the discharge port, holding woven bags, and catch the dehydrated granules as they flow out. However, prolonged manual collection can lead to fatigue, making it difficult to keep up with the machine's discharge speed. This can result in some granules spilling onto the ground. Utility Model Content

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0004] In view of the problems existing in the above and / or existing water ring granulation and dehydration systems for plastic production, this utility model is proposed.

[0005] Therefore, the problem that this utility model aims to solve is that manually collecting plastic granules flowing from the outlet of a vertical dewatering machine using woven bags for extended periods can lead to fatigue, difficulty in keeping up with the discharge speed, and may cause some granules to spill onto the ground.

[0006] To solve the above technical problems, this utility model provides the following technical solution: a water ring granulation and dehydration system for plastic production, which includes a main component, including a dehydrator, a discharge port fixed on one side of the dehydrator, a feed port fixed on the other side of the dehydrator, and a base fixed at the bottom of the dehydrator;

[0007] A loading assembly, disposed on the base, includes a loading component, the loading component including a support frame, the support frame being fixed to the top of the base, a clamping block being hinged to one side of the support frame, a force-bearing plate being disposed on the top of the support frame, a protective door being hinged to one side of the support frame, and a sealing cover being hinged to the bottom of the discharge port.

[0008] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, the loading assembly further includes a moving part, the moving part includes a first torsion spring, the first torsion spring is fixed to one side of the clamping block, one end of the first torsion spring is fixed to the inner wall of the support frame, a first ratchet is fixed to one side of the clamping block, a first pawl is provided on the top of the first ratchet, and the first ratchet and the first pawl mesh.

[0009] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, wherein: a moving block is fixed on one side of the first pawl, a pulling plate is hinged to one side of the moving block, and a drive plate is hinged to one side of the pulling plate.

[0010] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, wherein: a pull rope is fixed on one side of the drive plate, a positioning rod is sleeved on the outside of the pull rope, the pull rope and the positioning rod are movably connected, a lower pressure plate is fixed at one end of the pull rope, and the lower pressure plate is located below the force plate.

[0011] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, the loading assembly further includes a connector, the connector includes a connecting column, the connecting column is fixed to the top of the lower pressure plate, a connecting rod is hinged to one side of the connecting column, and the connecting rod is rotatably connected to one side of the support frame through a rotating shaft.

[0012] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, wherein: a second ratchet is fixed at one end of the protective door, a second pawl is provided at the bottom of the second ratchet, the second ratchet and the second pawl mesh, and the second pawl is rotatably connected to one side of the support frame through a rotating shaft.

[0013] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, wherein: a second torsion spring is fixed to one side of the second pawl, one end of the second torsion spring is fixed to one side of the support frame, a push plate is fixed to one side of the second pawl, and the push plate is disposed at the top of the connecting rod.

[0014] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, a third torsion spring is fixed on one side of the protective door, and one end of the third torsion spring is fixed to one side of the support frame.

[0015] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, a first pulley is provided on one side of the protective door, a belt is sleeved on the outside of the first pulley, and a second pulley is provided inside the belt.

[0016] As a preferred embodiment of the plastic production water ring granulation and dehydration system of this utility model, wherein: a rotating column is fixed on one side of the protective door, and the rotating column is fixed on one side of the first pulley.

[0017] The beneficial effects of this utility model are as follows: When receiving materials, the woven bag can be fixed with a bracket to ensure its stable position so as to receive the plastic particles flowing out of the outlet more smoothly. When the woven bag is gradually filled, the sealing cover at the outlet will automatically start to close the outlet, thereby effectively preventing the plastic particles from continuing to flow out and preventing the particles from scattering due to insufficient material receiving. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a structural diagram of a water ring granulation and dehydration system for plastic production.

[0020] Figure 2 Another perspective view of the overall structure of the water ring granulation and dehydration system for plastic production.

[0021] Figure 3 Water ring granulation and dewatering system for plastic production Figure 2 Enlarged view of the structure at point A in the middle.

[0022] Figure 4 This is a structural diagram of the support frame for a water ring granulation and dehydration system used in plastic production.

[0023] Figure 5 Water ring granulation and dewatering system for plastic production Figure 4 Enlarged view of the structure at point B in the middle.

[0024] Figure 6 A diagram showing the rope structure of a water ring granulation and dehydration system for plastic production.

[0025] Figure 7 This is a structural diagram of the load-bearing plate of a water ring granulation and dehydration system for plastic production.

[0026] Figure 8 The diagram shows the structure of the first torsion spring in a water ring granulation and dehydration system for plastic production.

[0027] In the diagram: Main component 100; Loading component 200; Dewatering machine 101; Discharge port 102; Feed port 103; Base 104; Loading component 201; Support frame 201a; Clamping block 201b; Force plate 201c; Protective door 201d; Sealing cover 201e; Moving component 202; First torsion spring 202a; First ratchet 202b; First pawl 202c; Moving block 202d; Pulling plate 202e; drive plate 202f; pull rope 202g; positioning rod 202h; lower pressure plate 202i; connector 203; connecting column 203a; connecting rod 203b; second ratchet 203c; second pawl 203d; second torsion spring 203e; push plate 203f; third torsion spring 203g; first pulley 203h; belt 203i; second pulley 203j; rotating column 203k. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0031] Example 1

[0032] Reference Figures 1 to 8 This is the first embodiment of the present invention. This embodiment provides a plastic production water ring granulation and dewatering system. The plastic production water ring granulation and dewatering system includes a main component 100 and a loading component 200. The two work together to fix the woven bag with a bracket to stabilize the position of the granules when receiving the material. After the bag is full, the discharge port sealing cap automatically closes the discharge port to prevent the granules from flowing out and scattering.

[0033] The main component 100 includes a dewatering machine 101, with a discharge port 102 fixed on one side of the dewatering machine 101, a feed port 103 fixed on the other side of the dewatering machine 101, and a base 104 fixed at the bottom of the dewatering machine 101.

[0034] In the water ring granulation and dehydration process of plastic production, the dehydrator 101 causes the plastic particles to lose moisture through the rotation of internal components. The dehydrator 101 is existing technology, so it will not be described in detail. The discharge port 102 is used to discharge the plastic particles after dehydration by the dehydrator 101 for easy collection later. The feed port 103 is the inlet for the plastic particles containing moisture to enter the dehydrator 101, ensuring that the material can enter smoothly for dehydration. The base 104 plays a role in providing stable support for the dehydrator 101, ensuring that the dehydrator 101 can be placed stably during operation.

[0035] The loading assembly 200 is mounted on the base 104 and includes a loading component 201. The loading component 201 includes a support frame 201a, which is fixed to the top of the base 104. A clamping block 201b is hinged to one side of the support frame 201a. A force-bearing plate 201c is provided on the top of the support frame 201a. A protective door 201d is hinged to one side of the support frame 201a. A sealing cover 201e is hinged to the bottom of the discharge port 102.

[0036] There are two clamping blocks 201b, which are hinged to the top sides of the support frame 201a respectively. When collecting plastic granules, first place the woven bag on the force plate 201c, then put the bag opening over the top of the support frame 201a, and then use the clamping blocks 201b to fix the bag opening. Then close the protective door 201d. When the protective door 201d is closed, the sealing cover 201e can be opened, and the plastic granules can be collected. A return spring is fixed at the bottom of the force plate 201c, and one end of the return spring is fixed to the support frame 201a. At the top, the force plate 201c and the support frame 201a are slidably connected. When the woven bag is full, it will squeeze the force plate 201c to move. When the force plate 201c moves to the bottom, the limit on the clamping block 201b and the protective door 201d will be released at the same time. Then the two can be opened at the same time. When the protective door 201d is opened, it can drive the closing cover 201e to move and close, which can block the discharge port 102 and stop the material from being discharged. Then the woven bag can be replaced to prevent plastic particles from falling to the ground due to the failure to replace the woven bag in time.

[0037] Example 2

[0038] Reference Figures 2-8 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0039] Specifically, the loading assembly 200 also includes a movable component 202, which includes a first torsion spring 202a. The first torsion spring 202a is fixed to one side of the clamping block 201b, and one end of the first torsion spring 202a is fixed to the inner wall of the support frame 201a. A first ratchet 202b is fixed to one side of the clamping block 201b, and a first pawl 202c is provided on the top of the first ratchet 202b. The first ratchet 202b and the first pawl 202c are engaged.

[0040] The first pawl 202c is rotatably connected to the inner wall of the support frame 201a via a pivot. A reset torsion spring is fixed on one side of the first pawl 202c, with one end of the reset torsion spring fixed to the inner wall of the support frame 201a. When the clamping block 201b moves to fix the woven bag, it can apply a torsional force to the first torsion spring 202a. When the clamping block 201b moves, it can drive the first ratchet 202b to rotate. At this time, the first pawl 202c will not limit the first ratchet 202b. After the woven bag is fixed, the first pawl 202c can limit the first ratchet 202b in one direction to prevent the force of the first torsion spring 202a from driving the clamping block 201b back to its original position.

[0041] When it is necessary to release the restriction on the woven bag, the first pawl 202c is moved. When the first pawl 202c moves, it can apply a torsional force to the reset torsion spring. The first pawl 202c can release the restriction on the clamping block 201b by moving and separating from the first ratchet 202b. Then, the clamping block 201b is driven back to its original position by the rotational force of the first torsion spring 202a, thereby releasing the restriction on the clamping block 201b.

[0042] Specifically, a moving block 202d is fixed to one side of the first pawl 202c, a pulling plate 202e is hinged to one side of the moving block 202d, and a drive plate 202f is hinged to one side of the pulling plate 202e.

[0043] When the woven bag is full, the force plate 201c moves to the bottom, which in turn moves the drive plate 202f. The movement of the drive plate 202f moves the pull plate 202e, which in turn moves the moving block 202d. At this time, the rotation of the moving block 202d moves the first pawl 202c to separate from the first ratchet 202b, thus releasing the limit on the clamping block 201b.

[0044] Specifically, a pull rope 202g is fixed on one side of the drive plate 202f, and a positioning rod 202h is sleeved on the outside of the pull rope 202g. The pull rope 202g and the positioning rod 202h are movably connected. A lower pressure plate 202i is fixed at one end of the pull rope 202g, and the lower pressure plate 202i is located below the force plate 201c.

[0045] When the force plate 201c moves to the bottom, it will squeeze the lower pressure plate 202i to move. The movement of the lower pressure plate 202i can drive the pull rope 202g to move. At this time, the movement of the pull rope 202g can drive the drive plate 202f to move. The positioning rod 202h is fixed to one side of the support frame 201a. The positioning rod 202h can support the pull rope 202g and prevent the pull rope 202g from deviating.

[0046] Specifically, the loading assembly 200 also includes a connector 203, which includes a connecting post 203a. The connecting post 203a is fixed to the top of the lower pressure plate 202i. A connecting rod 203b is hinged to one side of the connecting post 203a. The connecting rod 203b is rotatably connected to one side of the support frame 201a through a rotating shaft.

[0047] When the pressure plate 202i moves, it can drive the connecting column 203a to move. At this time, the movement of the connecting column 203a can drive the connecting rod 203b to move. The movement of the connecting rod 203b can release the limit on the protective door 201d, allowing the protective door 201d to open.

[0048] Specifically, a second ratchet 203c is fixed at one end of the protective door 201d, and a second pawl 203d is provided at the bottom of the second ratchet 203c. The second ratchet 203c and the second pawl 203d mesh with each other, and the second pawl 203d is rotatably connected to one side of the support frame 201a through a rotating shaft.

[0049] When the protective door 201d is closed, it can drive the second ratchet 203c to rotate. At this time, the second pawl 203d can limit the second ratchet 203c to prevent the protective door 201d from opening on its own. When the connecting rod 203b moves, it can drive the second pawl 203d and the second ratchet 203c to separate, thereby releasing the limit on the protective door 201d, and the protective door 201d can be opened.

[0050] Specifically, a second torsion spring 203e is fixed to one side of the second pawl 203d, one end of the second torsion spring 203e is fixed to one side of the support frame 201a, and a push plate 203f is fixed to one side of the second pawl 203d, with the push plate 203f located at the top of the connecting rod 203b.

[0051] When the second pawl 203d moves and separates from the second ratchet 203c, a torsional force can be applied to the second torsion spring 203e. The force of the second torsion spring 203e rotating can drive the second pawl 203d back to its original position and re-engage with the second ratchet 203c for the next use. The second pawl 203d can be moved by the connecting rod 203b pressing the push plate 203f.

[0052] Example 3

[0053] Reference Figures 1 to 8 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0054] Specifically, a third torsion spring 203g is fixed to one side of the protective door 201d, and one end of the third torsion spring 203g is fixed to one side of the support frame 201a.

[0055] When the protective door 201d is closed, a torsional force can be applied to the third torsion spring 203g. At this time, the second pawl 203d moves and engages with the second ratchet 203c, which can limit the protective door 201d in one direction and prevent the force of the third torsion spring 203g from rotating and driving the protective door 201d to open. When the second pawl 203d moves and separates from the second ratchet 203c, the force of the third torsion spring 203g rotating can drive the protective door 201d to open.

[0056] Specifically, a first pulley 203h is provided on one side of the protective door 201d, a belt 203i is sleeved on the outside of the first pulley 203h, and a second pulley 203j is provided inside the belt 203i.

[0057] When the protective door 201d moves, it can drive the first pulley 203h to rotate. The rotation of the first pulley 203h can drive the belt 203i to rotate. At this time, the rotation of the belt 203i can drive the second pulley 203j to rotate. Then, the rotation of the second pulley 203j can drive the closing cover 201e to move. The first pulley 203h and the second pulley 203j are both rotatably connected to the inner wall of the dewatering machine 101 through a rotating shaft.

[0058] Specifically, a rotating column 203k is fixed on one side of the protective door 201d, and the rotating column 203k is fixed on one side of the first pulley 203h.

[0059] The rotating column 203k is inserted into one side of the dewatering machine 101. The rotating column 203k is rotatably connected to one side of the dewatering machine 101 through a rotating shaft. When the protective door 201d moves, it can drive the rotating column 203k to rotate. The rotation of the rotating column 203k can drive the first pulley 203h to rotate.

[0060] In use, place the woven bag on the force plate 201c on top of the support frame 201a, then put the opening of the woven bag over the top of the support frame 201a, and operate the two clamping blocks 201b to move them toward the opening of the woven bag to fix them. When the clamping blocks 201b are moved, the clamping blocks 201b will drive the first ratchet 202b to rotate. At this time, the first pawl 202c will not limit the first ratchet 202b, and the movement of the clamping blocks 201b will apply a torsional force to the first torsion spring 202a. After the woven bag opening is secured, the first pawl 202c provides a one-way limit to the first ratchet 202b, preventing the force of the first torsion spring 202a's rotation from causing the clamping block 201b to return to its original position. Then, the protective door 201d is closed. When the protective door 201d closes, it drives the second ratchet 203c to rotate. The second pawl 203d limits the second ratchet 203c to prevent the protective door 201d from opening on its own. When the protective door 201d closes, it drives the first pulley 203h to rotate via the rotating column 203k. The rotation of the first pulley 203h drives the belt 203i to rotate, and the rotation of the belt 203i drives the second pulley 203j to rotate. The rotation of the second pulley 203j drives the closing cover 201e to move, causing the closing cover 201e to open. At this point, the preparation work is complete, and the collection of plastic granules can begin.

[0061] Then, the dewatering machine 101 is started. The dewatered plastic granules are discharged from the outlet 102 and fall into the prepared woven bag below for collection. As the number of plastic granules in the woven bag increases, when the bag is full, its weight will compress the force plate 201c, causing it to move downwards. The return spring at the bottom of the force plate 201c is compressed. When the force plate 201c moves to the bottom, it will compress the lower pressure plate 202i. The movement of the lower pressure plate 202i drives the pull rope 202g to move, and the movement of the pull rope 202g drives... The drive plate 202f moves, which in turn moves the pull plate 202e. The pull plate 202e moves, which in turn moves the moving block 202d. The moving block 202d rotates, which in turn moves the first pawl 202c, causing the first pawl 202c to separate from the first ratchet 202b, thus releasing the limit on the clamping block 201b. At the same time, the force plate 201c moves, which in turn moves the connecting column 203a. The connecting column 203a moves, which in turn moves the connecting rod 203b. The moving connecting rod 203b exerts pressure on the push plate 203f, causing the push plate 202f to move. 03f drives the second pawl 203d to move, causing the second pawl 203d to separate from the second ratchet 203c, releasing the restriction on the protective door 201d. The force of the first torsion spring 202a's rotation drives the clamp 201b back to its original position, releasing the fixation on the woven bag opening. The force of the third torsion spring 203g's rotation drives the protective door 201d to open. The opening of the protective door 201d causes the second pawl 203d to return to its original position under the action of the second torsion spring 203e's rotational force and re-engage with the second ratchet 203c. Furthermore, when the protective door 201d is open... The belt drive moves the closing cover 201e to close it, blocking the discharge port 102 and stopping the feeding. The woven bag filled with plastic granules is then removed and replaced with a new woven bag. The above steps are repeated to continue collecting plastic granules. Protective covers can be installed on the outside of exposed parts such as the second ratchet 203c, the second pawl 203d, and the push plate 203f, and fixed to one side of the support frame 201a to protect the exposed parts. The protective covers are existing technology and will not be described in detail here.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A water ring granulation dewatering system for plastics production, characterized by: include, The main component (100) includes a dewatering machine (101), a discharge port (102) fixed on one side of the dewatering machine (101), a feed port (103) fixed on the other side of the dewatering machine (101), and a base (104) fixed at the bottom of the dewatering machine (101). A loading assembly (200) is disposed on the base (104) and includes a loading component (201). The loading component (201) includes a support frame (201a). The support frame (201a) is fixed to the top of the base (104). A clamping block (201b) is hinged to one side of the support frame (201a). A force-bearing plate (201c) is provided on the top of the support frame (201a). A protective door (201d) is hinged to one side of the support frame (201a). A sealing cover (201e) is hinged to the bottom of the discharge port (102).

2. The water ring granulation dewatering system for plastic production according to claim 1, characterized in that: The loading assembly (200) further includes a movable component (202), which includes a first torsion spring (202a). The first torsion spring (202a) is fixed to one side of the clamping block (201b), and one end of the first torsion spring (202a) is fixed to the inner wall of the support frame (201a). A first ratchet (202b) is fixed to one side of the clamping block (201b), and a first pawl (202c) is provided on the top of the first ratchet (202b). The first ratchet (202b) and the first pawl (202c) are engaged.

3. The water ring granulation dewatering system for plastic production according to claim 2, characterized in that: A movable block (202d) is fixed to one side of the first pawl (202c), a pull plate (202e) is hinged to one side of the movable block (202d), and a drive plate (202f) is hinged to one side of the pull plate (202e).

4. The water ring granulation and dewatering system for plastic production as described in claim 3, characterized in that: A pull rope (202g) is fixed to one side of the drive plate (202f), and a positioning rod (202h) is sleeved on the outside of the pull rope (202g). The pull rope (202g) and the positioning rod (202h) are movably connected. A lower pressure plate (202i) is fixed to one end of the pull rope (202g), and the lower pressure plate (202i) is located below the force plate (201c).

5. The water ring granulation dewatering system for plastic production according to claim 4, wherein: The loading assembly (200) further includes a connector (203), which includes a connecting post (203a) fixed to the top of the lower pressure plate (202i). A connecting rod (203b) is hinged to one side of the connecting post (203a), and the connecting rod (203b) is rotatably connected to one side of the support frame (201a) via a rotating shaft.

6. The water ring granulation dewatering system for plastic production according to claim 5, wherein: One end of the protective door (201d) is fixed with a second ratchet (203c), and a second pawl (203d) is provided at the bottom of the second ratchet (203c). The second ratchet (203c) and the second pawl (203d) are engaged, and the second pawl (203d) is rotatably connected to one side of the support frame (201a) through a rotating shaft.

7. The water ring granulation dewatering system for plastic production according to claim 6, characterized in that: A second torsion spring (203e) is fixed to one side of the second pawl (203d), one end of the second torsion spring (203e) is fixed to one side of the support frame (201a), and a push plate (203f) is fixed to one side of the second pawl (203d), the push plate (203f) is disposed on the top of the connecting rod (203b).

8. The water ring granulation and dewatering system for plastic production as described in claim 6 or 7, characterized in that: A third torsion spring (203g) is fixed to one side of the protective door (201d), and one end of the third torsion spring (203g) is fixed to one side of the support frame (201a).

9. The water ring granulation dewatering system for plastic production according to claim 8, characterized in that: A first pulley (203h) is provided on one side of the protective door (201d), a belt (203i) is sleeved on the outside of the first pulley (203h), and a second pulley (203j) is provided inside the belt (203i).

10. The water ring granulation dewatering system for plastic production according to claim 9, wherein: A rotating column (203k) is fixed on one side of the protective door (201d), and the rotating column (203k) is fixed to one side of the first pulley (203h).

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