Coal sweeper for lower belt of belt conveyor

Abstract

The utility model discloses a lower belt coal sweeper of a belt conveyor. A lower belt coal sweeper of a belt conveyor comprises a connecting mechanism and a sweeping mechanism. The connecting mechanism comprises a first supporting plate, connecting assemblies are arranged on the two sides of the first supporting plate, each connecting assembly comprises a second supporting plate, a sliding rod is installed on one side of each second supporting plate, a sliding groove is formed in the side face of each first supporting plate, and one end of each sliding rod is inserted into the corresponding sliding groove. According to the lower belt coal sweeper of the belt conveyor, the connecting mechanism and the sweeping mechanism are arranged, coal or coal gangue on the top of the lower-layer belt of the belt conveyor is swept through the scraper blade, the coal or the coal gangue can be effectively prevented from being drawn into the power roller, and therefore the service life of the belt is prolonged; the safety risk of the belt conveyor is reduced, the adjustable connecting mechanism is utilized, the installation modes of the device can be diversified, and use is more flexible.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning devices, in particular to a lower belt coal sweeper for a belt conveyor. Background Art

[0002] Some tunnels in coal mines are inclined tunnels, and downhill excavation is adopted during excavation. Belt conveyors are used for long-distance excavation working faces to discharge gangue. Due to the long distance of the belt conveyor and the undulating tunnels, excessive belt tension will cause belt drifting and belt breakage, while too low tension will cause belt loosening and slipping, making it impossible to use normally. Appropriate tension can meet normal use, but coal will be scattered when the belt deviates, and coal or coal gangue will easily fall on the top of the belt on the lower layer. Coal gangue or coal will be drawn into the power roller at the tail of the belt conveyor, causing the belt to be over-tightened or even broken, which can easily cause safety accidents.

[0003] Therefore, it is necessary to provide a belt conveyor lower belt coal sweeper to solve the above-mentioned technical problems. Utility Model Content

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a belt conveyor lower belt coal sweeper which can clean the slag on the belt, prevent the slag from being drawn into the power roller, and reduce the safety risk of the belt conveyor.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] The lower belt coal sweeper of the belt conveyor comprises: a connecting mechanism and a cleaning mechanism, the cleaning mechanism is installed under the connecting mechanism, and is used for cleaning the slag on the top of the lower belt, the connecting mechanism is connected to the bracket column of the belt conveyor or the casing of the tail of the belt conveyor, the connecting mechanism comprises a first support plate, both sides of the first support plate are provided with connecting components, the connecting component comprises a second support plate, a sliding rod is installed on the side of the second support plate facing the first support plate, the sliding rod is a multi-prism structure, the side of the first support plate is provided with a sliding groove adapted to the sliding rod, one end of the sliding rod is inserted into the sliding groove and is slidably connected to the sliding groove, an adjusting member is installed between the first support plate and the second support plate, the two ends of the adjusting member are respectively connected to the first support plate and the second support plate, the length of the adjusting member itself is adjustable, and thus the distance between the first support plate and the second support plate can be adjusted, the first support plate The second support plate is rotatably installed with two clips on one side away from the first support plate, and a plurality of through holes are opened on the clips, and the two clips can rotate in a horizontal plane. When the distal ends of the two clips are close to each other and then buckled, they can be buckled on the bracket column of the belt conveyor. When the distal ends of the two clips are spread out away from each other, the inner sides of the two clips are attached to the casing of the belt conveyor, and the clips are connected to the casing using screws, thereby connecting the first support plate to the casing; the cleaning mechanism includes a mounting frame, which is obliquely mounted below the first support plate, and a scraper is mounted on the bottom of the mounting frame, and the scraper contacts the top of the lower belt of the belt conveyor. In the horizontal plane, there is a certain angle between the scraper and the moving direction of the belt, so that the scraper can scrape off the slag on the top of the belt and make the slag fall from the side of the belt. Two connecting plates are mounted on the top of the mounting frame, and the connecting plates are connected to the first support plate.

[0007] Preferably, the adjusting member comprises a threaded sleeve and two screws with opposite thread directions, one end of the screw is screwed into the threaded sleeve, and ends of the two screws that are away from each other are fixedly connected to the first support plate and the second support plate respectively.

[0008] Preferably, sliders are slidably installed on both sides of the first support plate, and the two sliders are set at an oblique angle. A rotating connection piece is installed at the bottom of the slider, and the bottom end of the rotating connection piece is connected to the connecting plate. Screws are installed on both sides of the first support plate, and the screws are connected to the sliders. A turntable is installed on the end of the screw. The turntable is rotated to make the slider slide along the side of the first support plate, so as to adjust the distance between the two sliders. Two guide rods are installed on the mounting frame, and the guide rods pass through the connecting plate. Two first springs are sleeved on the guide rods, and the two first springs are symmetrically arranged. The two ends of the first spring are respectively connected to the mounting frame and the connecting plate.

[0009] Preferably, a first T-shaped guide groove is provided on the side surface of the first support plate, one side of the sliding block is inserted into the first guide groove, and the sliding block is slidably connected to the first guide groove.

[0010] Preferably, a first mounting hole and a first limiting hole are provided on the side of the first support plate, the first limiting hole is provided on the outer side of the first mounting hole, the screw rod passes through the first mounting hole and is rotatably connected to the first mounting hole using a bearing, a plurality of sockets are provided on the turntable, a limiting rod is installed on the turntable, the limiting rod passes through the corresponding sockets and is screwed into the first limiting hole.

[0011] Preferably, the rotating connecting member includes a connecting tube, the bottom of the connecting tube is fixedly connected to the connecting member, a movable column is movably installed in the connecting tube, the movable column cannot fall out of the connecting tube, the top of the movable column is rotatably connected to the slider, and a second spring is installed between the connecting tube and the bottom of the movable column.

[0012] Preferably, a second T-shaped guide groove is provided at the bottom of the mounting frame, a sliding plate adapted to the second guide groove is fixedly installed on the top of the scraper, a connecting ear is installed on one side of the scraper, and a card slot adapted to the connecting ear is provided on the mounting frame. After the scraper is inserted into the second guide groove, the connecting ear is inserted into the card slot, and then a bolt is used to pass through the ear hole on the connecting ear and the second limiting hole on the mounting frame to connect and fix the scraper to the mounting frame.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] (1) The utility model provides a connection mechanism and a cleaning mechanism, and uses a scraper to clean the coal or coal gangue on the top of the lower belt of the belt conveyor, which can effectively prevent the coal or coal gangue from being rolled into the power roller, thereby extending the service life of the belt and reducing the safety risk of the belt conveyor. The adjustable connection mechanism can diversify the installation methods of the device and make it more flexible to use;

[0015] (2) The utility model can conveniently adjust the distance between the first support plate and the second support plate by providing an adjustment member including a threaded sleeve and two screws with opposite thread rotation directions;

[0016] (3) The utility model can conveniently adjust the angle of the scraper by providing a rotating connecting member, a screw rod, a slider, a guide rod, and a first spring;

[0017] (4) The utility model can limit the turntable by providing the first limit hole, the insertion hole and the limit rod, so that the position of the slider is stable;

[0018] (5) The utility model is provided with a rotating connection member including a connecting pipe, a movable column and a second spring, so that the scraper can automatically drop after the scraper is worn, so that the scraper can still clean the fallen slag, and the device is more convenient to use;

[0019] (6) The utility model provides a second guide groove, a sliding plate, a clamping groove, a connecting ear and a second limiting hole, so that the scraper can be plugged into the mounting frame, and the scraper can be easily replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of an embodiment of a belt conveyor lower belt coal sweeper provided by the utility model;

[0021] Figure 2 for Figure 1 The structural schematic diagram of the connecting mechanism in the lower belt coal sweeper of the belt conveyor shown;

[0022] Figure 3 for Figure 2 A magnified view of part A;

[0023] Figure 4 for Figure 1 A schematic diagram of an embodiment of a lower belt coal sweeper for a belt conveyor is shown;

[0024] Figure 5 for Figure 1 The schematic diagram of the structure of the cleaning mechanism in the lower belt coal sweeper of the belt conveyor shown;

[0025] Figure 6 for Figure 1 The structural schematic diagram of the first support plate in the lower belt coal sweeper of the belt conveyor shown;

[0026] Figure 7 for Figure 1 The schematic diagram of the structure of the rotating connecting member in the lower belt coal sweeper of the belt conveyor shown;

[0027] Figure 8 for Figure 1 The schematic diagram of the structure of the mounting frame in the lower belt coal sweeper of the belt conveyor shown;

[0028] Fig. 9 for Figure 1 The schematic diagram of the structure of the scraper in the lower belt coal sweeper of the belt conveyor is shown.

[0029] Among them, the names corresponding to the figure marks are: 1-connecting mechanism, 2-cleaning mechanism, 3-first support plate, 4-second support plate, 5-sliding rod, 6-fastener, 7-adjusting member, 8-threaded sleeve, 9-screw, 10-mounting frame, 11-scraper, 12-connecting plate, 13-rotating connecting member, 14-screw, 15-slider, 16-, 17-first guide groove, 18-first mounting hole, 19-first limiting hole, 20-sliding groove, 21-guide rod, 22-first spring, 23-connecting tube, 24-movable column, 25-second spring, 26-second guide groove, 27-sliding plate, 28-card slot, 29-connecting ear, 30-ear hole, 31-second limiting hole, 32-limiting rod. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0031] Embodiment 1:

[0032] like Figure 1-9 As shown, the utility model provides a belt conveyor lower belt coal sweeper, comprising: a connecting mechanism 1 and a cleaning mechanism 2 located between the upper and lower belts of the belt conveyor, the cleaning mechanism 2 being installed below the connecting mechanism 1 and used to clean the slag (coal slag or coal gangue, etc.) on the top of the lower belt, the connecting mechanism 1 being connected to the support column of the belt conveyor or the casing of the tail of the belt conveyor ( Figure 1 and Figure 2 As shown), the connecting mechanism 1 includes a first support plate 3, both sides of the first support plate 3 are provided with connecting components, the connecting component includes a second support plate 4, a sliding rod 5 is installed on the side of the second support plate 4 facing the first support plate 3, the sliding rod 5 is a multi-prism structure, the side of the first support plate 3 is provided with a sliding groove 20 adapted to the sliding rod 5, one end of the sliding rod 5 is inserted into the sliding groove 20 and slidably connected to the sliding groove 20, an adjusting member 7 is installed between the first support plate 3 and the second support plate 4, the two ends of the adjusting member 7 are respectively connected to the first support plate 3 and the second support plate 4, the length of the adjusting member 7 itself is adjustable, and thus the distance between the first support plate 3 and the second support plate 4 can be adjusted, when adjusting, the sliding rod 5 slides in the sliding groove 20, the second support plate 4 is rotatably installed on the side away from the first support plate 3 Two buckles 6 are provided on the buckle 6, a plurality of through holes are provided on the two buckles 6, and the two buckles 6 can rotate in a horizontal plane, when the distal ends of the two buckles 6 are close to each other and then buckled, they can be buckled on the bracket column of the belt conveyor ( Figure 1As shown), after being fastened, screws are used to fasten the first support plate 3 and the bracket column. When the distal ends of the two buckles 6 move away from each other and are separated and unfolded, the inner sides of the two buckles 6 are fitted into the casing of the belt conveyor, and the buckles 6 are connected to the casing using screws, thereby connecting the first support plate 3 to the casing; the cleaning mechanism 2 includes a mounting frame 10, which is obliquely mounted below the first support plate 3, and a scraper 11 is mounted at the bottom of the mounting frame 10. The scraper 11 contacts the top of the lower belt of the belt conveyor. In the horizontal plane, there is a certain angle between the scraper 11 and the moving direction of the belt, so that the scraper 11 can scrape off the slag on the top of the belt and make the slag fall from the side of the belt. Two connecting plates 12 are mounted on the top of the mounting frame 10, and the connecting plates 12 are connected to the The first support plate 3 is connected. When in use, the distance between the second support plate 4 and the first support plate 3 is adjusted by the adjusting piece 7. During adjustment, the sliding rod 5 slides in the sliding groove 20, which is convenient for connecting the buckle 6 to the bracket column or casing of the belt conveyor. The installation method is more flexible and diverse, so that the bottom of the scraper 11 contacts the top of the lower belt (the contact force should not be too large or too small. Too large a force will cause accelerated wear, and too small a force will easily cause incomplete cleaning of slag). When the belt conveyor is running, the belt moves, and the coal slag and coal gangue that fall on the top of the lower belt move to the scraper 11 and will be blocked by the scraper 11. The accumulated slag moves along the scraper 11 to the side of the belt, and finally falls to the ground from the side of the belt, thereby preventing the slag from being rolled into the power roller at the tail of the machine, causing the belt to crack or even cause a safety accident.

[0033] By setting up a connecting mechanism 1 and a cleaning mechanism 2, and using a scraper 11 to clean the coal or coal gangue on the top of the lower belt of the belt conveyor, the coal or coal gangue can be effectively prevented from being drawn into the power roller, thereby extending the service life of the belt and reducing the safety risk of the belt conveyor. The use of an adjustable connecting mechanism 1 can diversify the installation method of the device and make it more flexible to use.

[0034] Embodiment 2:

[0035] like Figure 2-3 As shown, the adjusting member 7 includes a threaded sleeve 8 and two screws 9 with opposite thread rotation directions. One end of the screw 9 is screwed into the threaded sleeve 8, and the ends of the two screws 9 that are away from each other are fixedly connected to the first support plate 3 and the second support plate 4 respectively. By rotating the threaded sleeve 8, the two screws 9 are brought closer to or away from each other, thereby adjusting the distance between the first support plate 3 and the second support plate 4.

[0036] By providing the adjusting member 7 including the threaded sleeve 8 and two screw rods 9 with opposite thread rotation directions, the distance between the first support plate 3 and the second support plate 4 can be conveniently adjusted.

[0037] Embodiment 3:

[0038] like Figure 1-3 and Figure 5 As shown, sliders 15 are slidably installed on both sides of the first support plate 3, and the two sliders 15 are set at an oblique angle. A rotating connecting piece 13 is installed at the bottom of the slider 15, and the bottom end of the rotating connecting piece 13 is connected to the connecting plate 12. Screw rods 14 are installed on both sides of the first support plate 3, and the screw rods 14 are connected to the sliders 15. A turntable 16 is installed at the end of the screw rod 14. The turntable 16 is rotated to rotate the screw rod 14, and then the slider 15 slides left and right along the side of the first support plate 3, so as to adjust the distance between the two sliders 15. The closer the two are, the greater the angle between the connecting line of the two and the first support plate 3. Two guide rods 21 are installed on the mounting frame 10, and the guide rods 21 penetrate the connecting plate 12. Two first springs 22 are sleeved on the guide rods 21. The two first springs 22 are symmetrically arranged, and the two ends of the first spring 22 are respectively connected to the mounting frame 10 and the connecting plate 12. When the belt 15 moves, the connecting plate 12 is driven to slide along the guide rod 21 by the rotating connecting member 13, thereby compressing or stretching the first spring 22. At the same time, the rotating connecting member 13 will rotate in the horizontal plane along the axial direction to adapt to the position change between the two sliders 15. The closer the distance between the two sliders 15 is, the closer the distance between the two connecting plates 12 is, and the more the first spring 22 is compressed. Through the compressed first spring 22, the mounting frame 10 will not deviate too far from the center of the belt, and the scraper 11 can always be located at the top of the belt, which is not easy to cause the phenomenon of slag leakage (that is, the scraper 11 does not completely cover the top of the belt, and part of the slag leaks from one side of the scraper 11). The closer the distance between the two sliders 15 is, the greater the inclination angle (the angle between the scraper 11 and the running direction of the belt) of the scraper 11 is. The greater the inclination angle, the easier it is for the slag to move to the side of the belt along the scraper 11 (the side facing the slag).

[0039] By providing the rotating connecting member 13 , the screw rod 14 , the sliding block 15 , the guide rod 21 , and the first spring 22 , the angle of the scraper 11 can be conveniently adjusted.

[0040] Embodiment 4:

[0041] like Figure 2 and Figure 6 As shown, a T-shaped first guide groove 17 is provided on the side of the first support plate 3, one side of the slider 15 is inserted into the first guide groove 17, and the slider 15 is slidably connected to the first guide groove 17. When in use, the slider 15 slides left and right along the first guide groove 17, thereby making the sliding of the slider 15 more stable.

[0042] By providing the first guide groove 17 , the slider 15 can be guided to move, so that the sliding of the slider 15 is more stable.

[0043] Embodiment 5:

[0044] like Figure 2-3 and Figure 6 As shown, a first mounting hole 18 and a first limiting hole 19 are provided on the side of the first support plate 3. The first limiting hole 19 is provided on the outer side of the first mounting hole 18. The screw rod 14 passes through the first mounting hole 18 and is rotatably connected to the first mounting hole 18 using a bearing. A plurality of insertion holes are provided on the turntable 16. A limiting rod 32 is installed on the turntable 16. The limiting rod 32 passes through the corresponding insertion holes and is screwed into the first limiting hole 19. When in use, the turntable 16 is rotated to rotate the screw rod 14. When the screw rod 14 is adjusted, the limiting rod 32 is passed through the insertion hole aligned with the first limiting hole 19 and is screwed into the first limiting hole 19, thereby limiting the turntable 16 to prevent the turntable 16 from rotating, thereby stabilizing the screw rod 14 and stabilizing the position of the slider 15.

[0045] By providing the first limiting hole 19 , the inserting hole and the limiting rod 32 , the rotating disk 16 can be limited so that the position of the slider 15 is stabilized.

[0046] Embodiment 6:

[0047] like Figure 2-3 and Figure 7 As shown, the rotating connecting member 13 includes a connecting tube 23, the bottom of which is fixedly connected to the connecting plate 12, and a movable column 24 is movably installed in the connecting tube 23, and the movable column 24 cannot be detached from the connecting tube 23. The top of the movable column 24 is rotatably connected to the slider 15, and a second spring 25 is installed between the connecting tube 23 and the bottom of the movable column 24. When in use, the movable column 24 can move up and down along the connecting tube 23, and can also rotate as an axis. When installed, a certain pressure is maintained between the scraper 11 and the belt. Under the reaction force of the pressure, the movable column 24 and the connecting tube 23 are brought close to each other, thereby compressing the second spring 25. After the scraper 11 is worn to a certain extent, the compressed second spring 25 automatically extends to make the scraper 11 drop, so that the bottom of the scraper 11 can still contact with the top of the belt and maintain a certain pressure, so that the scraper 11 can still clean the fallen slag.

[0048] By providing a rotating connection member 13 including a connection pipe 23, a movable column 24 and a second spring 25, the scraper 11 can be automatically lowered after the scraper 11 is worn, so that the scraper 11 can still clean the fallen slag, and the device is more convenient to use.

[0049] Embodiment 7:

[0050] like Figure 5 and Figure 8-9As shown, a T-shaped second guide groove 26 is provided at the bottom of the mounting frame 10, and a sliding plate 27 adapted to the second guide groove 26 is fixedly installed on the top of the scraper 11. The scraper 11 is inserted into the second guide groove 26 from the side of the second guide groove 26, so that the mounting frame 10 and the scraper 11 are plugged. A connecting ear 29 is installed on one side of the scraper 11, and a card slot 28 adapted to the connecting ear is provided on the mounting frame 10. After the scraper 11 is inserted into the second guide groove 26, the connecting ear 29 is inserted into the card slot 28, and then a bolt is used to pass through the ear hole 30 on the connecting ear 29 and the second limiting hole 31 on the mounting frame 10, and then the nut is tightened to fix the scraper 11. Since the side of the connecting ear 29 protrudes from the side plane of the mounting frame 10, after removing the bolt, the scraper 11 can be easily removed from the bottom of the mounting frame 10 by dragging the connecting ear 29. This makes it convenient to replace the scraper 11.

[0051] By providing the second guide groove 26 , the sliding plate 27 , the clamping groove 28 , the connecting ear 29 and the second limiting hole 31 , the scraper 11 is plugged into the mounting frame 10 , so that the scraper 11 can be easily replaced.

[0052] Working principle: When in use, the distance between the second support plate 4 and the first support plate 3 is adjusted through the adjusting piece 7. During adjustment, the sliding rod 5 slides in the sliding groove 20, which facilitates the connection of the buckle 6 to the bracket column or casing of the belt conveyor. The installation method is more flexible and diverse, so that the bottom of the scraper 11 is in contact with the top of the lower belt. When the belt conveyor is running, the belt moves, and the coal slag, coal gangue and other debris that fall on the top of the lower belt move to the scraper 11. The debris will be blocked by the scraper 11, and the accumulated debris moves along the scraper 11 to the side of the belt, and finally falls to the ground from the side of the belt, thereby preventing the debris from being rolled into the power roller at the tail of the machine, causing the belt to crack or even cause a safety accident.

Claims

1. A belt conveyor lower belt coal sweeper, characterized in that: include: A connecting mechanism (1) and a cleaning mechanism (2); The connecting mechanism (1) comprises a first supporting plate (3), both sides of the first supporting plate (3) are provided with connecting components, the connecting component comprises a second supporting plate (4), one side of the second supporting plate (4) is provided with a sliding rod (5), the side of the first supporting plate (3) is provided with a sliding groove (20), one end of the sliding rod (5) is inserted into the sliding groove (20), an adjusting member (7) is installed between the first supporting plate (3) and the second supporting plate (4), the adjusting member (7) is used to adjust the distance between the first supporting plate (3) and the second supporting plate (4), and two buckles (6) are installed on one side of the second supporting plate (4), and the two buckles (6) can be buckled and separated; The cleaning mechanism (2) comprises a mounting frame (10), wherein the mounting frame (10) is obliquely mounted below the first support plate (3), a scraper (11) is mounted at the bottom of the mounting frame (10), and two connecting plates (12) are mounted at the top of the mounting frame (10), wherein the connecting plates (12) are connected to the first support plate (3).

2. The belt conveyor lower belt coal sweeper according to claim 1, characterized in that: The adjusting member (7) comprises a threaded sleeve (8) and two screw rods (9) with opposite thread rotation directions, one end of the screw rod (9) is screwed into the threaded sleeve (8), and one end of the two screw rods (9) is respectively connected to the first support plate (3) and the second support plate (4).

3. The lower belt coal sweeper of a belt conveyor according to claim 1, characterized in that: Slide blocks (15) are slidably mounted on both sides of the first support plate (3); a rotating connection member (13) is mounted at the bottom of the slide block (15); the bottom end of the rotating connection member (13) is connected to the connecting plate (12); screw rods (14) are mounted on both sides of the first support plate (3); the screw rods (14) are connected to the slide blocks (15); and a rotating disk (16) is mounted at the end of the screw rods (14).

4. The lower belt coal sweeper of a belt conveyor according to claim 1, characterized in that: Two guide rods (21) are installed on the mounting frame (10), the guide rods (21) penetrate the connecting plate (12), and two first springs (22) are sleeved on the guide rods (21).

5. The lower belt coal sweeper of a belt conveyor according to claim 3, characterized in that: A first guide groove (17) is provided on the side surface of the first support plate (3), and the sliding block (15) is slidably connected to the first guide groove (17).

6. The lower belt coal sweeper of a belt conveyor according to claim 3, characterized in that: A first mounting hole (18) and a first limiting hole (19) are provided on the side of the first support plate (3); the screw rod (14) passes through the first mounting hole (18); a plurality of insertion holes are provided on the turntable (16); a limiting rod (32) is installed on the turntable (16); the limiting rod (32) passes through the corresponding insertion hole and is connected to the first limiting hole (19).

7. The lower belt coal sweeper of a belt conveyor according to claim 3, characterized in that: The rotating connecting member (13) comprises a connecting tube (23), the connecting tube (23) is connected to the connecting plate (12), a movable column (24) is installed in the connecting tube (23), the movable column (24) is connected to the sliding block (15), and a second spring (25) is installed between the connecting tube (23) and the movable column (24).

8. The lower belt coal sweeper of a belt conveyor according to claim 1, characterized in that: A second guide groove (26) is provided at the bottom of the mounting frame (10), a sliding plate (27) adapted to the second guide groove (26) is fixedly installed at the top of the scraper (11), a connecting ear (29) is installed on one side of the scraper (11), a clamping groove (28) adapted to the connecting ear (29) is provided on the mounting frame (10), a second limiting hole (31) is provided on the mounting frame (10), and the same bolt is installed in the connecting ear (29) and the second limiting hole (31).

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