Safety protection structure for broken chain of elevator compensation chain

Abstract

The present invention discloses a safety protection structure for the breakage of an elevator compensation chain, which relates to the technical field of elevators and comprises a fixed pile and an elevator compensation chain. A round hole is provided on the fixed pile, and a first spring is fixedly connected to the outer wall of the fixed pile, and a connecting piece is fixedly connected to the other end of the first spring, and the outer wall of the connecting piece is rotatably connected to a rotating rod through a bearing, and an anti-breakage mechanism is provided on the outer wall of the rotating rod, and the elevator compensation chain is arranged on the outer side of the middle part of the rotating rod. The present invention has the characteristics of strong practicability and reducing the shaking of the elevator compensation chain to prevent the breakage of the elevator compensation chain.

Description

Technical Field

[0001] The invention relates to the technical field of elevators, in particular to a safety protection structure for a broken chain of an elevator compensation chain. Background Art

[0002] The counterweight is a component of the elevator traction system, and its function is to balance the weight of the car. It is located on the other side of the car and is connected to the car through the traction wire rope. During the operation of the elevator, as the car continues to move up and down, dynamic imbalance will occur. In order to reduce the load difference borne by the traction wheel in the elevator transmission and improve the traction performance of the elevator, a compensation device is used, which evenly compensates for the difference in weight between the wire rope between the car and the counterweight, which has a positive effect on the stability and comfort of the elevator operation. However, with the demand for elevators with large lifting heights, the length of the elevator wire rope is getting longer and longer, and the length of the compensation chain will also increase accordingly. During the operation of the elevator, the compensation chain will also have a slight shake, and it may be hung on other components installed in the shaft, which will cause the compensation chain to be forcibly broken when the elevator moves up and down, which is not practical. Therefore, it is necessary to design a practical elevator compensation chain break safety protection structure;

[0003] An anti-breakage compensating chain guide device with an existing announcement number of CN214652853U can guide the elevator compensating chain when in use to prevent the compensating chain from shaking. However, since the elevator compensating chain will cause severe friction between the device and the guide, the device needs to be lubricated frequently. If the rotating part of the device cannot rotate quickly due to insufficient lubrication, the compensating chain will cause rapid friction between the device and cause an accident.

[0004] Therefore, it is necessary to design an elevator compensation chain break safety protection structure which is highly practical and can prevent the compensation chain from breaking. Summary of the invention

[0005] The object of the present invention is to provide an elevator compensating chain breakage safety protection structure to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an elevator compensation chain breakage safety protection structure, comprising a fixed pile and an elevator compensation chain, a round hole is opened on the fixed pile, an outer wall of the fixed pile is fixedly connected to a first spring, the other end of the first spring is fixedly connected to a connecting plate, the outer wall of the connecting plate is rotatably connected to a rotating rod through a bearing, the outer wall of the rotating rod is provided with an anti-breakage mechanism, and the elevator compensation chain is arranged on the outer side of the middle part of the rotating rod.

[0007] According to the above technical solution, the anti-fracture mechanism includes a rotating pile, the inner wall of the rotating pile is rotatably connected to the middle part of the outer wall of the rotating rod through a bearing, a heat dissipation hole is opened on the rotating pile, and the heat dissipation hole is a through hole that horizontally penetrates the rotating pile, the anti-fracture mechanism also includes a fixing plate, the inner wall of the fixing plate is fixedly connected to the outer wall of the rotating rod, the outer wall of the fixing plate is fixedly connected with a fan blade, and the anti-fracture mechanism also includes a lubrication mechanism, and the lubrication mechanism is arranged on a side of the rotating rod away from the fixing plate.

[0008] According to the above technical solution, the lubrication mechanism includes an inner cavity, which is opened inside the rotating rod, and the inner side wall of the inner cavity is provided with a first connecting hole, which is a through hole that penetrates inside and outside the rotating rod, one end of the first connecting hole is connected to the inside of the inner cavity, and the other end of the first connecting hole is connected to the outer wall of the rotating rod and the inner wall of the rotating pile, and the inner wall of the other side of the inner cavity is provided with a second connecting hole, and the second connecting hole connects the inner side and the outer side of the rotating rod, and the outer wall of the rotating rod is located at the outer side of the second connecting hole and is rotatably connected to a collar through a bearing, and the outer wall of the collar is fixedly connected to a connecting pipe, one end of the connecting pipe is connected to the collar and the rotating rod, and the connecting pipe The other end is connected with a lubricating oil pipe, the lower end of the lubricating oil pipe is fixedly connected to the outer wall of the fixed pile, and the inner wall of the connecting pipe and the lubricating oil pipe is fixedly connected with a first one-way valve, the output end of the first one-way valve is the end away from the inside of the lubricating oil pipe, and the side wall of the lubricating oil pipe is provided with an opening, and the inner wall of the lubricating oil pipe is slidably connected with a baffle, and a pressure plate is fixedly connected to the side of the baffle close to the center of the lubricating oil pipe, and the outer wall of the pressure plate contacts the inner wall of the lubricating oil pipe, and a second one-way valve is fixedly connected to the middle of the pressure plate, and the input side of the second one-way valve is the upper side, and a pressure block is fixedly connected to the other side of the baffle, and the pressure block passes through the opening on the lubricating oil pipe and extends to the outside of the lubricating oil pipe.

[0009] According to the above technical solution, the elevator compensation chain also includes a scraping mechanism, which is arranged on the outer wall of the rotating pile. The elevator compensation chain also includes a spring cavity, which is opened on the rotating rod. The inner wall of the spring cavity is fixedly connected to a second spring, and the other end of the second spring is fixedly connected to a counterweight block, and the other end of the counterweight block extends to the outside of the spring cavity.

[0010] According to the above technical solution, the scraping mechanism includes a scraper, the outer wall of the scraper is fixedly connected to the outer wall of the rotating pile, the lower side of the scraper contacts the outer wall of the rotating rod, the outer wall of the scraper is fixedly connected to a slide rail, the inner wall of the slide rail is slidably connected to a connecting frame, the outer wall of the connecting frame is hinged with a scraper blade through a torsion spring, the lower end of the scraper blade contacts the outer wall of the scraper, and the upper end of the scraper blade is fixedly connected to a counterweight rod.

[0011] According to the above technical solution, the length of the counterweight block is greater than the distance between the outer wall of the rotating rod and the outer wall of the pressure block. The pressure block is located on the rotation path after the counterweight block extends out of the spring cavity. An elastic rope is fixedly connected to the upper side of the pressure plate, and the upper end of the elastic rope is fixedly connected to the upper side of the inner wall of the lubricating oil pipe.

[0012] According to the above technical solution, the mass of the counterweight rod is greater than the mass of the scraper blade, and the lower end of the scraper blade is a structure that protrudes toward one side of the scraper plate.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: in the present invention, lubricating oil is pre-injected into the lubricating oil pipe, and the elevator compensation chain is wound around the outer wall of the rotating pile. When the elevator compensation chain moves rapidly, the rotating pile is driven to rotate rapidly, so that the rotating pile guides the elevator compensation chain. When the elevator compensation chain moves rapidly, the shaking generated by the rotating pile drives the rotating rod to shake, and the rotating rod drives the connecting piece to shake, so that the first spring generates deformation and absorbs energy, so that the shaking of the rotating rod and the rotating pile is reduced, thereby preventing the elevator compensation chain from breaking.

[0014] If the lubrication level of the connection between the rotating pile and the rotating rod is reduced, the rotating pile will drive the rotating rod to rotate rapidly, so that the rotating rod will first drive the fixing plate to rotate, and the fixing plate will drive the fan blades to rotate to blow air to cool the heat dissipation holes and the rotating pile, so as to prevent high-temperature wear at the rotating pile and avoid damage caused by excessive temperature rise;

[0015] When the rotating rod rotates rapidly, the counterweight block will move to the outside of the rotating rod due to its own inertia, causing the counterweight block to pull the second spring to deform. After the counterweight block extends out of the rotating rod, its rotation path passes through the pressure block, causing the counterweight block to squeeze the pressure block, causing the pressure block to drive the baffle plate and the pressure plate to move downward, causing the elastic rope to be stretched, causing the pressure plate to squeeze the lubricating oil inside the lubricating oil pipe downward, causing the lubricating oil to flow into between the rotating pile and the rotating rod through the connecting pipe, the collar, the second connecting hole, the inner cavity, and the first connecting hole, so as to lubricate the rotating pile and prevent it from drying out.

[0016] When the pile rotates, the scraper will be driven to rotate rapidly, so that the scraper can scrape off the lubricating oil and dirt squeezed out from the edge of the gap between the outer wall of the pile and the outer wall of the rotating rod, to prevent the accumulation between the outer wall of the pile and the outer wall of the rotating rod and cause damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the internal structure of the rotating rod of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the spring chamber of the present invention;

[0021] Figure 4 The present invention Figure 3 The structural diagram of A in the figure;

[0022] Figure 5 It is a structural schematic diagram of the lubricating oil pipe of the present invention;

[0023] Figure 6 It is a schematic diagram of the internal structure of the lubricating oil pipe of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the scraping mechanism of the present invention;

[0025] In the figure: 1 fixed pile, 2 first spring, 3 connecting piece, 4 rotating rod, 5 elevator compensation chain, 6 anti-fracture mechanism, 601 rotating pile, 602 heat dissipation hole, 603 fixed piece, 604 fan blade, 605 lubrication mechanism, 501 inner cavity, 502 first connecting hole, 503 second connecting hole, 504 collar, 505 connecting pipe, 506 lubricating oil pipe, 507 first one-way valve, 508 baffle, 509 pressure plate, 510 second one-way valve, 511 pressure block, 512 scraping mechanism, 513 spring cavity, 514 second spring, 515 counterweight block, 516 elastic rope, 201 scraper, 202 slide rail, 203 connecting frame, 204 scraper, 205 counterweight rod. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-7 The present invention provides a technical solution: an elevator compensation chain breakage safety protection structure, comprising a fixed pile 1 and an elevator compensation chain 5. A round hole is opened on the fixed pile 1. A first spring 2 is fixedly connected to the outer wall of the fixed pile 1. The other end of the first spring 2 is fixedly connected to a connecting piece 3. The outer wall of the connecting piece 3 is rotatably connected to a rotating rod 4 through a bearing. An anti-breakage mechanism 6 is arranged on the outer wall of the rotating rod 4. The elevator compensation chain 5 is arranged on the outer side of the middle part of the rotating rod 4.

[0028] The anti-fracture mechanism 6 includes a rotating pile 601, the inner wall of which is rotatably connected to the middle part of the outer wall of the rotating rod 4 through a bearing, and a heat dissipation hole 602 is provided on the rotating pile 601, and the heat dissipation hole 602 is a through hole that horizontally penetrates the rotating pile 601. The anti-fracture mechanism 6 also includes a fixing plate 603, the inner wall of which is fixedly connected to the outer wall of the rotating rod 4, and the outer wall of the fixing plate 603 is fixedly connected with a fan blade 604. The anti-fracture mechanism 6 also includes a lubrication mechanism 605, which is arranged on the side of the rotating rod 4 away from the fixing plate 603.

[0029] The lubrication mechanism 605 includes an inner cavity 501, which is opened inside the rotating rod 4. The inner wall of the inner cavity 501 is provided with a first connecting hole 502, which is a through hole that penetrates inside and outside the rotating rod 4. One end of the first connecting hole 502 is connected to the inside of the inner cavity 501, and the other end of the first connecting hole 502 is connected to the outer wall of the rotating rod 4 and the inner wall of the rotating pile 601. A second connecting hole 503 is opened on the inner wall of the other side of the inner cavity 501, and the second connecting hole 503 connects the inside and outside of the rotating rod 4. The outer wall of the rotating rod 4 is located outside the second connecting hole 503 and is rotatably connected to a collar 504 through a bearing. The outer wall of the collar 504 is fixedly connected to a connecting pipe 505, one end of the connecting pipe 505 is connected to the collar 504 and the rotating rod 4, and the other end of the connecting pipe 505 is connected to Lubricating oil pipe 506, the lower end of the lubricating oil pipe 506 is fixedly connected to the outer wall of the fixed pile 1, the inner wall of the connecting pipe 505 and the lubricating oil pipe 506 is fixedly connected with a first one-way valve 507, the output end of the first one-way valve 507 is the end away from the inside of the lubricating oil pipe 506, the side wall of the lubricating oil pipe 506 is provided with an opening, the inner wall of the lubricating oil pipe 506 is slidably connected with a baffle 508, the side of the baffle 508 close to the center of the lubricating oil pipe 506 is fixedly connected with a pressure plate 509, the outer wall of the pressure plate 509 is in contact with the inner wall of the lubricating oil pipe 506, the middle part of the pressure plate 509 is fixedly connected with a second one-way valve 510, the input side of the second one-way valve 510 is the upper side, and the other side of the baffle 508 is fixedly connected with a pressure block 511, and the pressure block 511 passes through the opening on the lubricating oil pipe 506 and extends to the outside of the lubricating oil pipe 506.

[0030] The elevator compensation chain 5 also includes a scraping mechanism 512, which is arranged on the outer wall of the rotating pile 601. The elevator compensation chain 5 also includes a spring chamber 513, which is opened on the rotating rod 4. The inner wall of the spring chamber 513 is fixedly connected with a second spring 514, and the other end of the second spring 514 is fixedly connected with a counterweight block 515. The other end of the counterweight block 515 extends to the outside of the spring chamber 513. The length of the counterweight block 515 is greater than the distance between the outer wall of the rotating rod 4 and the outer wall of the pressure block 511. The pressure block 511 is located on the rotation path after the counterweight block 515 extends out of the spring chamber 513. The upper side of the pressure plate 509 is fixedly connected with an elastic rope 516, and the upper end of the elastic rope 516 is fixedly connected to the upper side of the inner wall of the lubricating oil pipe 506.

[0031] The scraping mechanism 512 includes a scraper 201, the outer wall of the scraper 201 is fixedly connected to the outer wall of the rotating pile 601, the lower side of the scraper 201 contacts the outer wall of the rotating rod 4, the outer wall of the scraper 201 is fixedly connected to the slide rail 202, the inner wall of the slide rail 202 is slidably connected to the connecting frame 203, the outer wall of the connecting frame 203 is hinged with a scraper blade 204 through a torsion spring, the lower end of the scraper blade 204 contacts the outer wall of the scraper 201, the upper end of the scraper blade 204 is fixedly connected to a counterweight rod 205, the mass of the counterweight rod 205 is greater than the mass of the scraper blade 204, and the lower end of the scraper blade 204 is a structure protruding toward one side of the scraper 201.

[0032] When in use, lubricating oil is injected into the lubricating oil pipe 506 in advance, and the elevator compensation chain 5 is wound around the outer wall of the rotating pile 601. When the elevator compensation chain 5 moves quickly, the rotating pile 601 will be driven to rotate quickly, so that the rotating pile 601 guides the elevator compensation chain 5;

[0033] The shaking generated when the elevator compensation chain 5 moves quickly will cause the rotating pile 601 to drive the rotating rod 4 to shake, and the rotating rod 4 will drive the connecting piece 3 to shake, so that the first spring 2 will deform and absorb energy, and the shaking of the rotating rod 4 and the rotating pile 601 will be reduced;

[0034] If the lubrication degree of the connection between the rotating pile 601 and the rotating rod 4 is reduced, the rotating pile 601 will drive the rotating rod 4 to rotate rapidly, so that the rotating rod 4 first drives the fixing plate 603 to rotate, and the fixing plate 603 drives the fan blade 604 to rotate to blow air to cool down the heat dissipation hole 602 and the rotating pile 601, so as to prevent the rotating pile 600 from high-temperature wear and avoid damage caused by excessive temperature rise;

[0035] When the rotating rod 4 rotates rapidly, the counterweight 515 will move to the outside of the rotating rod 4 due to its own inertia, so that the counterweight 515 pulls the second spring 514 to deform. After the counterweight 515 extends out of the rotating rod 4, its rotation path passes through the pressing block 511, which will cause the counterweight 515 to squeeze the pressing block 511, so that the pressing block 511 drives the baffle 508 and the pressing plate 509 to move downward, so that the elastic rope 516 is stretched, and the pressing plate 509 squeezes the lubricating oil in the lubricating oil pipe 506 downward, so that the lubricating oil passes through the connecting pipe 505, the collar 504, the second connecting hole 503, the inner cavity 501, and the first connecting hole 502 to flow into between the rotating pile 601 and the rotating rod 4, so that the rotating pile 601 is lubricated to prevent it from drying out.

[0036] After the rotating pile 601 is lubricated, the rotation speed of the rotating rod 4 decreases, so that the second spring 514 recovers its deformation and pulls the counterweight block 515 to reset the counterweight block 515. After the pressing block 511 loses the squeeze of the counterweight block 515, the elastic rope 516 recovers its deformation and pulls the pressing plate 509 upward, so that the lubricating oil on the upper side of the pressing plate 509 flows to the lower side of the pressing plate 509 through the conduction of the second one-way valve 510, so that the pressing block 511 resets.

[0037] When the rotating pile 601 rotates, the scraper 201 is driven to rotate rapidly, so that the scraper 201 scrapes off the lubricating oil and dirt squeezed out from the edge of the gap between the outer wall of the rotating pile 601 and the outer wall of the rotating rod 4, to prevent the accumulation between the outer wall of the rotating pile 601 and the outer wall of the rotating rod 4 and cause damage;

[0038] While the scraper 201 rotates following the rotating pile 601, when the scraper 201 rotates to the upper side of the rotating rod 4, due to the large mass of the counterweight rod 205, the counterweight rod 205 and the scraper blade 204 will slide to the lower side of the slide rail 202, so that the lower end of the scraper blade 204 will contact the lower side of the scraper 201. When the scraper 201 rotates to the lower side of the rotating rod 4, the counterweight rod 205 will fall at this time, which will cause the scraper blade 204 to remove the dirt scraped off the scraper 201 to prevent it from adhering to the scraper 201.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Elevator compensation chain breakage safety protection structure, including a fixed pile (1) and an elevator compensation chain (5). A circular hole is provided on the fixed pile (1). It is characterized in that: A first spring (2) is fixedly connected to the outer wall of the fixed pile (1). The other end of the first spring (2) is fixedly connected to a connecting piece (3). A rotating rod (4) is rotatably connected to the outer wall of the connecting piece (3) through a bearing. An anti-fracture mechanism (6) is arranged on the outer wall of the rotating rod (4). The elevator compensation chain (5) is arranged on the outer side of the middle part of the rotating rod (4). The anti-fracture mechanism (6) includes a rotating pile (601). The inner wall of the rotating pile (601) is rotatably connected to the middle part of the outer wall of the rotating rod (4) through a bearing. Heat dissipation holes (602) are provided on the rotating pile (601). The heat dissipation holes (602) are through holes that horizontally penetrate the rotating pile (601). The anti-fracture mechanism (6) further includes a fixed piece (603). The inner wall of the fixed piece (603) is fixedly connected to the outer wall of the rotating rod (4). A fan blade (604) is fixedly connected to the outer wall of the fixed piece (603). The anti-fracture mechanism (6) further includes a lubricating mechanism (605). The lubricating mechanism (605) is arranged on the side of the rotating rod (4) away from the fixed piece (603). The lubrication mechanism (605) includes an inner cavity (501) which is opened inside the rotating rod (4). A first connection hole (502) is formed on the inner side wall of the inner cavity (501). The first connection hole (502) is a through hole penetrating the inside and outside of the rotating rod (4). One end of the first connection hole (502) is communicated with the inside of the inner cavity (501), and the other end of the first connection hole (502) is communicated between the outer wall of the rotating rod (4) and the inner wall of the rotating pile (601). A second connection hole (503) is formed on the other inner side wall of the inner cavity (501), and the second connection hole (503) communicates the inside and outside of the rotating rod (4). A collar (504) is rotatably connected to the outer wall of the rotating rod (4) through a bearing at the outside of the second connection hole (503). A connecting pipe (505) is fixedly connected to the outer wall of the collar (504). One end of the connecting pipe (505) is communicated between the collar (504) and the rotating rod (4). The other end of the connecting pipe (505) is communicated with a lubricating oil pipe (506). The lower end of the lubricating oil pipe (506) is fixedly connected to the outer wall of the fixed pile (1). A first one-way valve (507) is fixedly connected to the inner wall at the communicating part of the connecting pipe (505) and the lubricating oil pipe (506). The output end of the first one-way valve (507) is the end far from the inside of the lubricating oil pipe (506). An opening is formed on the side wall of the lubricating oil pipe (506). A baffle (508) is slidably connected to the inner wall of the lubricating oil pipe (506). A pressing plate (509) is fixedly connected to the side of the baffle (508) close to the center of the lubricating oil pipe (506). The outer wall of the pressing plate (509) contacts with the inner wall of the lubricating oil pipe (506). A second one-way valve (510) is fixedly connected to the middle of the pressing plate (509). The input side of the second one-way valve (510) is the upper side. A pressing block (511) is fixedly connected to the other side of the baffle (508), and the pressing block (511) penetrates through the opening on the lubricating oil pipe (506) and extends to the outside of the lubricating oil pipe (506).

2. The elevator compensation chain breakage safety protection structure according to claim 1, characterized in that: The elevator compensation chain (5) further includes a scraping mechanism (512), and the scraping mechanism (512) is arranged on the outer side wall of the rotating pile (601). The elevator compensation chain (5) further includes a spring cavity (513), and the spring cavity (513) is opened on the rotating rod (4). A second spring (514) is fixedly connected to the inner wall of the spring cavity (513). The other end of the second spring (514) is fixedly connected to a counterweight (515), and the other end of the counterweight (515) extends to the outside of the spring cavity (513).

3. The elevator compensation chain breakage safety protection structure according to claim 2, characterized in that: The scraping mechanism (512) includes a scraping plate (201), the outer wall of the scraping plate (201) is fixedly connected to the outer wall of the rotating pile (601), the lower side of the scraping plate (201) is in contact with the outer wall of the rotating rod (4), a slide rail (202) is fixedly connected to the outer wall of the scraping plate (201), a connecting frame (203) is slidably connected to the inner wall of the slide rail (202), a scraping blade (204) is hinged to the outer wall of the connecting frame (203) through a torsion spring, the lower end of the scraping blade (204) is in contact with the outer wall of the scraping plate (201), and a counterweight rod (205) is fixedly connected to the upper end of the scraping blade (204).

4. The elevator compensation chain breakage safety protection structure according to claim 3, characterized in that: the length of the counterweight block (515) is greater than the distance between the outer wall of the rotating rod (4) and the outer wall of the pressing block (511), the pressing block (511) is located on the rotation path after the counterweight block (515) extends out of the spring cavity (513), an elastic rope (516) is fixedly connected to the upper side of the pressing plate (509), and the upper end of the elastic rope (516) is fixedly connected to the upper side of the inner wall of the lubricating oil pipe (506).

5. The elevator compensation chain breakage safety protection structure according to claim 4, characterized in that: the mass of the counterweight rod (205) is greater than the mass of the scraping blade (204), and the lower end of the scraping blade (204) is a structure protruding towards one side of the scraping plate (201).

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