Coal belt conveyor cleaning device

Abstract

The present application relates to coal belt conveyor technical field, especially a kind of coal belt conveyor cleaning device, it includes belt conveyor, with the belt frame of belt conveyor fixed connection connection limiting unit, with the rotation connection of connection limiting unit lifting unit, and the first cleaning unit and second cleaning unit of being driven clean by belt conveyor, and the knocking unit of being driven by second cleaning unit.The beneficial effects of the present application are that the belt to be cleaned is located at the same height by the lifting unit, which overcomes the problem of softness and difficulty in cleaning after long-term use of the belt, and the first cleaning unit is provided to clean the upper surface of the belt, the second cleaning unit is provided to scrape the lower surface of the belt (which can supplement the cleaning of the dead angle of the first cleaning unit), and the knocking unit is driven by the second cleaning unit to knock and vibrate the belt, achieving triple cleaning effect of the conveyor belt.

Description

Technical Field

[0001] This invention relates to the field of coal conveyor belt technology, and in particular to a coal conveyor belt cleaning device. Background Technology

[0002] Coal, as a vital energy source, plays a crucial role in both heavy and light industries. As a major coal-producing country, my country extracts large quantities of coal daily. After extraction, the coal needs to be transported from the mine to the surface using conveyor belts, and then transported throughout the country by train or truck.

[0003] However, during long-term transportation, a large amount of coal residue will adhere to the conveyor belt. If not cleaned in time, this residue will continue to accumulate, eventually leading to problems that are difficult to clean. Furthermore, after prolonged use, the coal conveyor belt may become fatigued, further increasing the difficulty of cleaning. Summary of the Invention

[0004] In view of the problems existing in the above or prior art, the present invention is proposed.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a coal conveyor belt cleaning device, which includes a belt conveyor, a connection limiting unit fixedly connected to the belt frame of the belt conveyor, a lifting unit rotatably connected to the connection limiting unit, a first cleaning unit and a second cleaning unit driven by the belt conveyor for cleaning, and a knocking unit driven by the second cleaning unit, wherein the belt frame is symmetrically arranged with respect to the central axis of the belt, and the connection limiting unit is fixedly connected to the two belt frames.

[0006] The connecting limiting unit is used for the installation and limiting of the first cleaning unit, the second cleaning unit, and the tapping unit.

[0007] As a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the lifting unit includes a drive shaft with a limit unit passing through both ends, two rotating handles fixedly connected to both ends of the drive shaft, a rotating gear fixedly sleeved in the middle of the drive shaft, and two sets of lifting components driven by the rotating gear.

[0008] As a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the lifting assembly is provided in two sets, including two connecting rods whose ends move vertically along the connecting limiting unit, a vertical rack fixedly connected to the two connecting rods, and a cleaning platform fixedly connected to one end of the vertical rack.

[0009] The vertical rack meshes with the rotating gear.

[0010] In a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the first cleaning unit is disposed above the conveyor belt and cleans the upper surface of the belt.

[0011] The first cleaning unit includes a drive assembly driven by a transmission roller of a belt conveyor, a driven assembly that is rotated by the drive assembly, and a cleaning assembly driven by the driven assembly.

[0012] As a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the drive assembly includes a drive shaft that is rotatably connected to the connecting limit unit at both ends, a transmission belt connecting the transmission roller and the drive shaft, and multiple sets of first bevel gears that are coaxial with and fixedly connected to the drive shaft.

[0013] As a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the driven component includes a mounting frame that is fixedly connected to the connecting and limiting unit at both ends, and a driven member corresponding to each first bevel gear;

[0014] The driven component includes a driven shaft rotatably connected to the mounting bracket, and a second bevel gear fixedly connected to one end of the driven shaft, wherein the first bevel gear and the second bevel gear are meshed together.

[0015] As a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the cleaning components are provided in multiple sets, and each driven shaft is provided with a corresponding cleaning component;

[0016] The cleaning assembly includes a connecting post threadedly connected to the driven shaft, a cleaning disc fixedly connected to one end of the connecting post, and cleaning brushes evenly distributed on the lower surface of the cleaning disc.

[0017] As a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the second cleaning unit includes a rotating plate fixedly sleeved on the transmission roller, drive columns symmetrically arranged at both ends of the rotating plate, a shaped block that moves linearly along the connecting limiting unit, an L-shaped rotating rod rotatably connected to the connecting limiting unit, a Z-shaped connecting rod with one end fixedly connected to the side wall of the shaped block, and a trapezoidal scraper fixedly connected to the other end of the Z-shaped connecting rod.

[0018] As a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the irregular block includes a first straight section, a driven column fixedly disposed on the upper surface of the first end of the first straight section, an arc-shaped block fixedly disposed on the upper surface of the second end of the first straight section, a second straight section fixedly connected to the side wall of the second end of the first straight section, and a vertical slot disposed on the second straight section.

[0019] As a preferred embodiment of the coal conveyor belt cleaning device of the present invention, the device comprises: a U-shaped fixed frame fixedly connected to the striking unit and the connecting limiting unit, a fixed column fixedly connected to the U-shaped fixed frame, a movable column that moves vertically up and down along the U-shaped fixed frame, a translation plate that is connected to the second straight section by a vertical slot, and a striking component fixedly connected to the movable column.

[0020] The striking component includes a lifting rod fixedly connected to the upper end of the movable column, and striking rods evenly distributed along the lower surface of the lifting rod.

[0021] The beneficial effects of this invention are as follows: This invention uses a lifting unit to keep the belts to be cleaned at the same horizontal level, overcoming the problem of belts becoming weak and difficult to clean after long-term use. The first cleaning unit brushes and cleans the upper belt surface, while the second cleaning unit scrapes and cleans the lower belt surface (additionally cleaning the blind spots of the first cleaning unit). At the same time, the second cleaning unit drives a tapping unit to tap and vibrate the belt for cleaning, achieving a triple cleaning effect on the conveyor belt. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0023] Figure 1 This is a schematic diagram of the overall structure of the cleaning device for a coal conveyor belt.

[0024] Figure 2 A partial structural diagram Figure 1 .

[0025] Figure 3 A partial structural diagram Figure 2 .

[0026] Figure 4 A partial structural diagram Figure 3 .

[0027] Figure 5 This is a magnified schematic diagram of a portion of the structure. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention 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 invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one 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 is mutually exclusive with other embodiments.

[0031] Example 1

[0032] Reference Figures 1-4 This is the first embodiment of the present invention. This embodiment provides a coal conveyor belt cleaning device, which includes a conveyor belt 100, a connection limiting unit 200 fixedly connected to the belt frame of the conveyor belt 100, a lifting unit 300 rotatably connected to the connection limiting unit 200, a first cleaning unit 400 and a second cleaning unit 500 driven by the conveyor belt 100 for cleaning, and a knocking unit 600 driven by the second cleaning unit 500. The belt frames are symmetrically arranged about the central axis of the belt, and the connection limiting unit 200 is fixedly connected to the two belt frames.

[0033] The connection limiting unit 200 is used to install and limit the first cleaning unit 400, the second cleaning unit 500 and the tapping unit 600.

[0034] It should be noted that the belt conveyor 100 drives the first cleaning unit 400 to rotate, thereby cleaning the upper surface of the belt by brushing. Simultaneously, it drives the second cleaning unit 500 to move horizontally, thereby cleaning the lower surface of the belt by scraping. This achieves dual cleaning of the belt. At the same time, the second cleaning unit 500 drives the tapping unit 600 to perform intermittent tapping cleaning of the lower belt, further improving the cleaning efficiency of the belt.

[0035] Furthermore, the lifting unit 300 includes a drive shaft 301 with both ends passing through the connecting limiting unit 200, two rotating handles 302 fixedly connected to both ends of the drive shaft 301, a rotating gear 303 fixedly sleeved in the middle of the drive shaft 301, and two sets of lifting components 304 driven by the rotating gear 303. Both sets of lifting components 304 are driven by the rotating gear 303 to move vertically up and down along the connecting limiting unit 200. At the same time, the rotating handles 302 are provided with locking units, and are in a locked state when no rotation occurs. This can be achieved by existing technology and will not be described in detail here.

[0036] Furthermore, the lifting assembly 304 is provided with two sets, including two connecting rods 304a, one end of which moves vertically along the connecting limiting unit 200, a vertical rack 304b fixedly connected to the two connecting rods 304a, and a cleaning platform 304c fixedly connected to one end of the vertical rack 304b. The two vertical racks 304b are arranged in parallel, and the connecting limiting unit 200 is provided with a limiting groove that matches the connecting rods 304a, so that they can only move vertically along the limiting groove.

[0037] The vertical rack 304b is meshed with the rotating gear 303.

[0038] It should be noted that when an external force drives the rotating handle 302 to rotate, it simultaneously drives the drive shaft 301 and the rotating gear 303 to rotate. The rotation of the rotating gear 303 simultaneously drives the two vertical racks 304b to move vertically along the connecting limit unit 200, that is, the two cleaning platforms 304c move vertically in opposite directions.

[0039] Furthermore, the first cleaning unit 400 is positioned above the belt conveyor 100 to clean the upper surface of the belt;

[0040] The first cleaning unit 400 includes a drive assembly 401 driven by a transmission roller of a belt conveyor 100, a driven assembly 402 driven to rotate by the drive assembly 401, and a cleaning assembly 403 driven by the driven assembly 402.

[0041] Furthermore, the drive assembly 401 includes a drive shaft 401a that is rotatably connected to the connecting and limiting unit 200 at both ends, a transmission belt 401b that connects the transmission roller and the drive shaft 401a, and multiple sets of first bevel gears 401c that are coaxial with and fixedly connected to the drive shaft 401a. The two ends of the drive shaft 401a are connected to the connecting and limiting unit 200 through bearings, and it only rotates without displacement.

[0042] Furthermore, the driven component 402 includes a mounting bracket 402a that is fixedly connected to the connecting limiting unit 200 at both ends, and a driven member 402b that is correspondingly provided to each of the first bevel gears 401c;

[0043] The driven member 402b includes a driven shaft 402b-1 rotatably connected to the mounting bracket 402a, and a second bevel gear 402b-2 fixedly connected to one end of the driven shaft 402b-1. The first bevel gear 401c and the second bevel gear 402b-2 are meshed together. The driven shaft 402b-1 and the mounting bracket 402a are connected by bearings and only rotate without displacement.

[0044] Furthermore, the cleaning components 403 are provided in multiple sets, with each driven shaft 402b-1 corresponding to one cleaning component 403;

[0045] The cleaning assembly 403 includes a connecting post 403a threadedly connected to the driven shaft 402b-1, a cleaning disc 403b fixedly connected to one end of the connecting post 403a, and a cleaning brush 403c evenly disposed on the lower surface of the cleaning disc 403b.

[0046] It should be noted that the rotation of the transmission roller synchronously drives the drive shaft 401a to rotate via the transmission belt 401b. The drive shaft 401a drives the first bevel gear 401c to rotate. The rotation of the first bevel gear 401c drives multiple sets of cleaning components 403 to rotate via the second bevel gear 402b-2, thereby achieving the brushing and cleaning of the upper surface of the upper belt (the cleaning platform 304c supports the belt to be cleaned to the same horizontal plane).

[0047] Furthermore, the second cleaning unit 500 includes a rotating plate 501 fixedly sleeved on the transmission roller, drive columns 502 symmetrically arranged at both ends of the rotating plate 501, a shaped block 503 that moves linearly along the connecting limiting unit 200, an L-shaped rotating rod 504 rotatably connected to the connecting limiting unit 200, a Z-shaped connecting rod 505 with one end fixedly connected to the side wall of the shaped block 503, and a trapezoidal scraper 506 fixedly connected to the other end of the Z-shaped connecting rod 505.

[0048] It should be noted that the irregular block 503 moves reciprocally in a straight line along the connecting limiting unit 200 with the cooperation of the rotating plate 501, the drive column 502 and the L-shaped rotating rod 504.

[0049] Furthermore, the irregular block 503 includes a first straight segment 503a, a driven post 503b fixedly disposed on the upper surface of the first end of the first straight segment 503a, an arc-shaped block 503c fixedly disposed on the upper surface of the second end of the first straight segment 503a, a second straight segment 503d fixedly connected to the side wall of the second end of the first straight segment 503a, and a vertical slot 503e disposed on the second straight segment 503d.

[0050] It should be noted that during the rotation of the transmission roller, the rotating plate 501 is driven to rotate. The rotating plate 501 drives the driven column 503b (i.e., the irregular block 503) to move horizontally along the connecting limiting unit 200 through a driving column 502. At the same time, the arc block 503c moves horizontally and drives the L-shaped rotating rod 504 to rotate. As the rotating plate 501 continues to rotate, the other driven column 503b rotates and squeezes the L-shaped rotating rod 504, causing the L-shaped rotating rod 504 to be squeezed and drive the arc block 503c to accelerate its reset. This causes the irregular block 503 to move reciprocally in a straight line along the connecting limiting unit 200, and through the Z-shaped connecting rod 505, it drives the trapezoidal scraper 506 to perform horizontal reciprocating scraping and cleaning along the lower surface of the lower belt.

[0051] Preferably, the second cleaning unit 500 can perform supplementary cleaning on the blind spots of the first cleaning unit 400, thereby increasing the cleaning range and improving cleaning ability.

[0052] Furthermore, the striking unit 600 is fixedly connected to the connecting limiting unit 200 via a U-shaped fixing frame 601, a fixing column 602 fixedly connected to the U-shaped fixing frame 601, a movable column 603 that moves vertically along the U-shaped fixing frame 601, a translation plate 604 that engages with the second straight section 503d through a vertical slot 503e, and a striking element 605 fixedly connected to the movable column 603. The translation plate 604 has beveled edges on both sides.

[0053] The striking element 605 includes a lifting rod 605a fixedly connected to the upper end of the movable column 603, and striking rods 605b evenly arranged along the lower surface of the lifting rod 605a. The lifting rod 605a is a horizontal rod, and all striking rods 605b are located at the same horizontal height.

[0054] It should be noted that when the irregular block 503 moves back and forth along the connecting limiting unit 200, it drives the engaged translation plate 604 to move. During the translation process, the translation plate moves up and down with the cooperation of the fixed column 602 and an inclined side. The movable column 603 moves vertically up and down under the action of the other inclined side, which simultaneously drives the striking part 605 to move vertically up and down, thereby achieving the knocking and cleaning of the belt.

[0055] Preferably, while performing dual cleaning of the belt, the irregularly shaped block 503 drives the striking element 605 to knock and vibrate the residual coal on the surface of the transmission belt 401b, further improving the cleaning efficiency of the belt.

[0056] In use, this invention includes two usage states:

[0057] In the first usage state, the belt to be cleaned is tightened and supported to ensure that belts of the same cross section are at the same horizontal height, but the conveyor belt is not cleaned. Specifically, when an external force drives the rotating handle 302 to rotate, it simultaneously drives the drive shaft 301 and the rotating gear 303 to rotate. The rotation of the rotating gear 303 simultaneously drives the two vertical racks 304b to move in opposite directions in a straight line, which synchronously drives the two cleaning platforms 304c to move up and down, so that the two cleaning platforms 304c are directly above / below the belt to be cleaned.

[0058] The second usage state includes three usage processes:

[0059] The first usage process achieves the cleaning of the upper belt surface by brushing. Specifically, after the lifting unit 300 is in place, the belt conveyor 100 is started. The transmission roller drives the drive shaft 401a to rotate through the transmission belt 401b. The drive shaft 401a drives the first bevel gear 401c to rotate. The rotation of the first bevel gear 401c drives the connecting column 403a, the cleaning disc 403b, and the cleaning brush 403c to rotate in sequence through the second bevel gear 402b-2, thereby achieving the cleaning of the upper surface of the upper belt by brushing.

[0060] The second process involves scraping and cleaning the surface of the lower belt. Specifically, the rotation of the transmission roller synchronously drives the rotating plate 501 to rotate. The rotating plate 501 drives the driven column 503b (i.e., the irregular block 503) to move horizontally along the connecting limiting unit 200 via a drive column 502. At the same time, the arc block 503c moves horizontally, driving the L-shaped rotating rod 504 to rotate. As the rotating plate 501 continues to rotate, the other driven column 503b rotates and squeezes the L-shaped rotating rod 504, causing the L-shaped rotating rod 504 to be squeezed and drive the arc block 503c to accelerate its reset. This causes the irregular block 503 to move reciprocally in a straight line along the connecting limiting unit 200. Through the Z-shaped connecting rod 505, the trapezoidal scraper 506 performs horizontal reciprocating scraping and cleaning along the lower surface of the lower belt. This allows the second cleaning unit 500 to supplement the cleaning dead corners of the first cleaning unit 400, achieving a dual cleaning effect on the belt.

[0061] The third process involves cleaning the belt surface through tapping and vibration. Specifically, when the irregular block 503 moves back and forth along the connecting limiting unit 200, it drives the engaged translation plate 604 to move. During the translation process, the translation plate rises and falls with the cooperation of the fixed column 602 and an inclined side. The movable column 603 rises and falls vertically under the action of the other inclined side, simultaneously driving the vertical rise and fall (accelerated descent) of the lifting rod 605a and the tapping rod 605b, thus achieving tapping and cleaning of the belt and realizing a triple cleaning effect on the belt.

[0062] In summary, the beneficial effects of the coal conveyor belt cleaning device of the present invention are as follows: the lifting unit 300 ensures that the belt to be cleaned is at the same horizontal level, overcoming the problem of belt fatigue and difficulty in cleaning after long-term use; the first cleaning unit 400 performs brush cleaning of the upper belt surface; the second cleaning unit 500 performs scraping cleaning of the lower belt surface (capable of supplementing cleaning of the blind spots of the first cleaning unit 400); and the second cleaning unit 500 drives the tapping unit 600 to perform tapping and vibration cleaning of the belt, thus achieving a triple cleaning effect on the conveyor belt.

[0063] Example 2

[0064] Reference Figure 5 This is the second embodiment of the present invention. This embodiment provides a preferred solution for a coal conveyor belt cleaning device, which includes a striking unit 600 located above the scraper 506, and the rest of the structure is the same as in embodiment 1.

[0065] In summary, the beneficial effect of the coal conveyor belt cleaning device of the present invention is that the striking unit 600 can not only strike soft belts during the striking cleaning process, but also strike belts supported by hard objects, resulting in a better cleaning effect.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention 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 solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A cleaning device for a coal conveyor belt, characterized in that: include, The system includes a belt conveyor (100), a connection limiting unit (200) fixedly connected to the belt frame of the belt conveyor (100), a lifting unit (300) rotatably connected to the connection limiting unit (200), a first cleaning unit (400) and a second cleaning unit (500) driven by the belt conveyor (100), and a striking unit (600) driven by the second cleaning unit (500), wherein the belt frame is symmetrically arranged about the central axis of the belt, and the connection limiting unit (200) is fixedly connected to the two belt frames; The connecting limiting unit (200) is used to install and limit the first cleaning unit (400), the second cleaning unit (500), and the tapping unit (600); The second cleaning unit (500) includes a rotating plate (501) fixedly sleeved on the transmission roller, drive columns (502) symmetrically arranged at both ends of the rotating plate (501), a shaped block (503) that moves linearly along the connecting limiting unit (200), an L-shaped rotating rod (504) rotatably connected to the connecting limiting unit (200), a Z-shaped connecting rod (505) with one end fixedly connected to the side wall of the shaped block (503), and a trapezoidal scraper (506) fixedly connected to the other end of the Z-shaped connecting rod (505). The irregular block (503) includes a first straight section (503a), a driven post (503b) fixedly disposed on the upper surface of the first end of the first straight section (503a), an arc-shaped block (503c) fixedly disposed on the upper surface of the second end of the first straight section (503a), a second straight section (503d) fixedly connected to the side wall of the second end of the first straight section (503a), and a vertical slot (503e) disposed on the second straight section (503d).

2. The coal conveyor belt cleaning device as described in claim 1, characterized in that: The lifting unit (300) includes a drive shaft (301) through which the connecting limiting unit (200) passes at both ends, two rotating handles (302) fixedly connected to both ends of the drive shaft (301), a rotating gear (303) fixedly sleeved in the middle of the drive shaft (301), and two sets of lifting components (304) driven by the rotating gear (303).

3. The coal conveyor belt cleaning device as described in claim 2, characterized in that: The lifting assembly (304) is provided in two sets, including two connecting rods (304a) whose ends move vertically along the connecting limiting unit (200), a vertical rack (304b) fixedly connected to the two connecting rods (304a), and a cleaning platform (304c) fixedly connected to one end of the vertical rack (304b). The vertical rack (304b) is meshed with the rotating gear (303).

4. The coal conveyor belt cleaning device as described in claim 3, characterized in that: The first cleaning unit (400) is positioned above the belt conveyor (100) to clean the upper surface of the belt; The first cleaning unit (400) includes a drive assembly (401) driven by the transmission roller of the belt conveyor (100), a driven assembly (402) driven to rotate by the drive assembly (401), and a cleaning assembly (403) driven by the driven assembly (402).

5. The coal conveyor belt cleaning device as described in claim 4, characterized in that: The drive assembly (401) includes a drive shaft (401a) that is rotatably connected to the connection limiting unit (200) at both ends, a transmission belt (401b) that connects the transmission roller and the drive shaft (401a), and multiple sets of first bevel gears (401c) that are coaxial with and fixedly connected to the drive shaft (401a).

6. The coal conveyor belt cleaning device as described in claim 5, characterized in that: The driven component (402) includes a mounting bracket (402a) that is fixedly connected to the connection limiting unit (200) at both ends, and a driven member (402b) corresponding to each of the first bevel gears (401c). The driven member (402b) includes a driven shaft (402b-1) rotatably connected to the mounting bracket (402a), and a second bevel gear (402b-2) fixedly connected to one end of the driven shaft (402b-1), wherein the first bevel gear (401c) and the second bevel gear (402b-2) are meshed together.

7. The coal conveyor belt cleaning device as described in claim 6, characterized in that: The cleaning components (403) are provided in multiple sets, and each driven shaft (402b-1) is associated with a corresponding cleaning component (403). The cleaning assembly (403) includes a connecting post (403a) threadedly connected to the driven shaft (402b-1), a cleaning disc (403b) fixedly connected to one end of the connecting post (403a), and a cleaning brush (403c) evenly disposed on the lower surface of the cleaning disc (403b).

8. The coal conveyor belt cleaning device as described in claim 7, characterized in that: The striking unit (600) is fixedly connected to the U-shaped fixing frame (601) and the connecting limiting unit (200), the fixing column (602) is fixedly connected to the U-shaped fixing frame (601), the movable column (603) that moves vertically along the U-shaped fixing frame (601), the translation plate (604) that engages with the second straight section (503d) through the vertical slot (503e), and the striking element (605) that is fixedly connected to the movable column (603); The striking element (605) includes a lifting rod (605a) fixedly connected to the upper end of the movable column (603), and striking rods (605b) evenly arranged along the lower surface of the lifting rod (605a).

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