Polishing device for aluminum alloy die casting

Abstract

The utility model belongs to the technical field of aluminum product polishing, and particularly relates to an aluminum alloy die casting polishing device which comprises four supporting plates. A first shell cover is fixedly connected to the bottom sides of the four supporting plates in a matched mode, a lower grinding wheel is installed in the first shell cover through a first rotating shaft in a matched mode, a first motor is installed on one side wall of the first shell cover, a supporting frame is fixedly connected to the four supporting plates in a matched mode, and limiting sliding grooves are formed in the two sides of the supporting frame. When the aluminum plate polishing device is used for polishing an aluminum plate, the two faces of the aluminum plate can be polished at the same time, the time for overturning the aluminum plate and repositioning the aluminum plate is remarkably shortened, therefore, the time needed by the whole polishing process is shortened, the polishing efficiency is greatly improved, the two faces of the aluminum plate can be processed under the same condition by polishing the two faces at the same time, and the polishing efficiency is improved. And the problem of inconsistent grinding effects caused by condition differences is avoided, and the overall quality and appearance consistency of products can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum product grinding, in particular to a grinding device for aluminum alloy die-castings. Background Technique

[0002] Aluminum products are products processed from aluminum alloy as raw materials. Among them, in the processing of the most common aluminum alloy plates, it is often necessary to grind their surfaces. Through grinding, burrs and uneven parts on the aluminum plate surface can be removed, making the aluminum plate surface smoother and flatter.

[0003] A Chinese patent with the publication number CN220330938U discloses a grinding device for aluminum alloy die-castings, which relates to the technical field of grinding devices and includes a platform. One side above the platform is fixedly provided with a grinding box. One side of the grinding box is an open end. A movable table that can move into the grinding box is slidably arranged on the platform. A second telescopic rod is fixedly provided on the upper wall of the grinding box. The telescopic end of the second telescopic rod is fixedly provided with a mounting plate. A motor is fixedly provided below the mounting plate. The driving end of the motor is fixedly provided with a grinding disc. A pair of chutes are arranged inside the two side walls of the grinding box at the open end. A box door is slidably connected in the pair of chutes. A connection component is arranged between the box door and the movable table. The opening or closing of the box door can be realized through the movement of the movable table. The utility model can prevent the dust generated during grinding from spreading outwards through the provided grinding box and the box door, and at the same time reduce the noise generated during grinding.

[0004] The above-mentioned grinding device for aluminum alloy die-castings still has some problems during use. When grinding an aluminum plate, only one side of the aluminum plate can be ground at a time. Since only one side can be ground at a time, it is necessary to flip the aluminum plate and repeat the operation to complete the grinding of both sides of the aluminum plate. The operation steps are relatively cumbersome, increasing the overall time required for grinding and greatly reducing the grinding efficiency. Moreover, grinding the two sides separately may result in inconsistent grinding effects, thus affecting the processing quality of the product. Therefore, a grinding device for aluminum alloy die-castings is proposed for the above problems. Content of the Utility Model

[0005] In order to make up for the deficiencies of the prior art and solve the problems raised in the above background technique, the utility model proposes a grinding device for aluminum alloy die-castings.

[0006] The technical solution adopted by the present utility model to solve its technical problems is as follows: A grinding device for aluminum alloy die-castings of the present utility model includes four support plates; a first housing is fixedly connected to the bottom sides of the four support plates. A lower grinding wheel is installed in the first housing through a first rotating shaft. A first motor is installed on one side wall of the first housing, and the output end of the first motor is connected to one end of the first rotating shaft. A support frame is fixedly connected by the four support plates. Limiting sliding grooves are provided on both sides of the support frame. Lifting blocks are arranged in both limiting sliding grooves. A second housing is fixedly connected between the two lifting blocks. An upper grinding wheel is installed in the second housing through a second rotating shaft. A second motor is installed on one side wall of the second housing, and the output end of the second motor is connected to one end of the second rotating shaft. Two third motors are installed on the top sides of the support plates. The output ends of the third motors are provided with lead screws, and the bottom ends of the lead screws are rotatably installed on the inner bottom walls of the limiting sliding grooves, and the lead screws penetrate through the lifting blocks. When grinding the aluminum plate, first start the third motor to rotate the lead screw, forcing the lifting block to move downward in the limiting sliding groove, and then the second housing and the upper grinding wheel also move downward accordingly. Until the upper grinding wheel moves downward to contact the top surface of the aluminum plate, start the first motor and the second motor to rotate the lower grinding wheel and the upper grinding wheel. When the aluminum plate is conveyed through between the lower grinding wheel and the upper grinding wheel, the grinding treatment of both sides of the aluminum plate can be completed. Thus, the two sides of the aluminum plate can be ground simultaneously, significantly reducing the time for flipping the aluminum plate and repositioning, thereby shortening the time required for the entire grinding process and greatly improving the grinding efficiency. And grinding both sides simultaneously can ensure that the two sides of the aluminum plate are processed under the same conditions, avoiding the problem of inconsistent grinding effects caused by different conditions, which helps to improve the overall quality and appearance consistency of the product.

[0007] Preferably, dust suction ports are provided on both the first housing cover and the second housing cover. Dust suction covers are fixedly connected to the ports of the two dust suction ports. Rotating rods are rotatably installed in the two dust suction covers. Spiral crushing blades are sleeved on the outer surface of the rotating rods. A fourth motor is installed at one end of the dust suction cover. The output end of the fourth motor is connected to one end of the rotating rod. A debris collection box is installed on the top side of the support frame. A dust suction pipe is connected between the dust suction cover at the bottom end and the debris collection box. A short dust suction pipe is connected to the dust suction cover at the upper end, and the other end of the short dust suction pipe is connected to the dust suction pipe. A negative pressure pump is installed on the top side of the debris collection box. The input hole of the negative pressure pump is connected to an air extraction pipe, and the output hole of the negative pressure pump is connected to an exhaust pipe. During the grinding process, the negative pressure pump is started to extract the gas in the debris collection box through the air extraction pipe and discharge it through the exhaust pipe, making the inside of the debris collection box in a negative pressure state. Thus, the debris generated during the grinding process can be sucked into the debris collection box through the dust suction pipe and the short dust suction pipe, so that the debris generated during the grinding process can be cleaned and collected in a timely manner, avoiding the phenomenon of debris flying everywhere and ensuring the quality of the working environment. Since the debris generated by the grinding of the aluminum plate may contain relatively large particles or strip-shaped metal sheets, these large debris are likely to block the pipeline. Through the operation of the fourth motor, the spiral crushing blades rotate, so that crushing treatment can be carried out, and these large debris can be broken into smaller particles, so that they can be smoothly sucked into the debris collection box, avoiding the phenomenon of pipeline blockage.

[0008] Preferably, a filter screen plate is arranged in the debris collection box, and the filter screen plate is arranged around the port of the air extraction pipe. A slag discharge port is opened on one side wall of the debris collection box. Limit sliding rails are fixedly connected to both sides of the port of the slag discharge port. A sealing cover plate is slidably assembled with the two limit sliding rails in a matching manner. When using this device, by arranging the filter screen plate, the air extraction pipe can be prevented from being blocked, ensuring the normal progress of the dust suction operation. By arranging the slag discharge port, it is convenient to take out the debris collected in the debris collection box.

[0009] Preferably, conveying rollers are installed between two support plates at the same end through a rotating shaft in a matching manner. A fifth motor is installed on two of the support plates. The output end of the fifth motor is connected to one end of one of the rotating shafts. When conveying the aluminum plate, first place the aluminum plate on the conveying rollers, and start the fifth motor to make the conveying rollers rotate, so that the aluminum plate can be automatically conveyed.

[0010] Preferably, a fixed plate is fixedly connected to each support plate, and a pneumatic cylinder is installed on each fixed plate. The acting end of the pneumatic cylinder is equipped with a pneumatic rod, and the other end of the pneumatic rod is fixedly connected to a limiting plate. Fixed blocks are fixedly connected to both side walls of each fixed plate, rod holes are formed in each fixed block, a limiting rod is inserted into each rod hole, and one end of the limiting rod is fixedly connected to the limiting plate. When conveying the aluminum plate, the pneumatic cylinder is started to drive the limiting plate to move through the pneumatic rod, so that the two limiting plates approach each other, thereby being able to limit both sides of the aluminum plate and avoid the phenomenon of the aluminum plate shifting during transportation. By providing the limiting rod, the limiting plate can move stably, improving the stability of the movement of the limiting plate.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1. When the present utility model grinds the aluminum plate, first, the third motor is started to rotate the lead screw, forcing the lifting block to move downward in the limiting chute, and then the second housing and the upper grinding wheel also move downward accordingly. When the upper grinding wheel moves downward until it contacts the top side of the aluminum plate, the first motor and the second motor are started to rotate the lower grinding wheel and the upper grinding wheel. When the aluminum plate is conveyed through between the lower grinding wheel and the upper grinding wheel, the grinding treatment of both sides of the aluminum plate can be completed, thereby being able to grind both sides of the aluminum plate simultaneously, significantly reducing the time for flipping the aluminum plate and repositioning, thus shortening the time required for the entire grinding process and greatly improving the grinding efficiency. Moreover, grinding both sides simultaneously can ensure that both sides of the aluminum plate are processed under the same conditions, avoiding the problem of inconsistent grinding effects caused by condition differences, which helps to improve the overall quality and appearance consistency of the product;

[0013] 2. During the grinding process of the present utility model, the negative pressure pump is started to extract the gas in the debris collection box through the suction pipe and discharge it through the exhaust pipe, making the inside of the debris collection box in a negative pressure state. Thereby, the debris generated during the grinding process can be sucked into the debris collection box through the dust collection pipeline and the short dust collection pipe, so that the debris generated during the grinding process can be cleaned and collected in a timely manner, avoiding the phenomenon of debris flying everywhere and ensuring the quality of the working environment; Since the debris generated by grinding the aluminum plate may contain relatively large particles or long strip-shaped metal pieces, these large debris are prone to clogging the pipeline. Through the operation of the fourth motor, the spiral crushing blade rotates, thereby being able to perform crushing treatment, and being able to crush these large debris into smaller particles, so that they can be smoothly sucked into the debris collection box, avoiding the phenomenon of pipeline blockage. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is a schematic perspective view of the overall side structure of the device;

[0016] Figure 2 It is a schematic perspective view of the grinding mechanism;

[0017] Figure 3 It is a schematic perspective view of the cross-section of the debris collection box;

[0018] Figure 4 It is a schematic perspective view of the cross-section of the dust suction hood;

[0019] Figure 5 It is a schematic perspective view of the conveying and limiting mechanism.

[0020] In the figure: 1, support plate; 2, first housing; 3, lower grinding wheel; 4, first motor; 5, support frame; 6, limiting chute; 7, lifting block; 8, second housing; 9, upper grinding wheel; 10, second motor; 11, third motor; 12, lead screw; 13, dust suction hood; 14, fourth motor; 15, rotating rod; 16, spiral crushing blade; 17, debris collection box; 18, dust suction pipe; 19, short dust suction pipe; 20, negative pressure pump; 21, extraction pipe; 22, exhaust pipe; 23, filter screen plate; 24, limiting slide rail; 25, sealing cover plate; 26, fixing plate; 27, pneumatic cylinder; 28, limiting plate; 29, fixing block; 30, limiting rod; 31, conveying roller; 32, fifth motor. Specific embodiments

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] Please refer to Figures 1-3As shown in the figure, a grinding device for aluminum alloy die-castings includes four support plates 1; a first housing 2 is fixedly connected to the bottom sides of the four support plates 1. A lower grinding wheel 3 is installed in the first housing 2 through a first rotating shaft. A first motor 4 is installed on one side wall of the first housing 2, and the output end of the first motor 4 is connected to one end of the first rotating shaft. The four support plates 1 are fixedly connected to form a support frame 5. Limiting sliding grooves 6 are opened on both sides of the support frame 5. Lifting blocks 7 are arranged in both of the two limiting sliding grooves 6. A second housing 8 is fixedly connected between the two lifting blocks 7. An upper grinding wheel 9 is installed in the second housing 8 through a second rotating shaft. A second motor 10 is installed on one side wall of the second housing 8, and the output end of the second motor 10 is connected to one end of the second rotating shaft. Two third motors 11 are installed on the top sides of the support plates 1. The output ends of the third motors 11 are provided with lead screws 12, and the bottom ends of the lead screws 12 are rotatably installed on the bottom inner walls of the limiting sliding grooves 6, and the lead screws 12 penetrate through the lifting blocks 7; when grinding an aluminum plate, first start the third motor 11 to make the lead screw 12 rotate, forcing the lifting block 7 to move downward in the limiting sliding groove 6, and then the second housing 8 and the upper grinding wheel 9 also move downward accordingly until the upper grinding wheel 9 moves downward to contact the top surface of the aluminum plate. Then start the first motor 4 and the second motor 10 to make the lower grinding wheel 3 and the upper grinding wheel 9 rotate. When the aluminum plate is conveyed through between the lower grinding wheel 3 and the upper grinding wheel 9, the grinding treatment of both sides of the aluminum plate can be completed. Thus, the two sides of the aluminum plate can be ground simultaneously, significantly reducing the time for flipping the aluminum plate and repositioning, thereby shortening the time required for the entire grinding process and greatly improving the grinding efficiency. Moreover, grinding both sides simultaneously can ensure that the two sides of the aluminum plate are processed under the same conditions, avoiding the problem of inconsistent grinding effects caused by condition differences, which helps to improve the overall quality and appearance consistency of the product.

[0023] Please refer to Figures 3-4As shown in the figure, dust suction ports are provided on both the first housing 2 and the second housing 8. Dust suction covers 13 are fixedly connected to the ports of the two dust suction ports. Rotating rods 15 are rotatably installed in the two dust suction covers 13. Spiral crushing blades 16 are sleeved on the outer surface of the rotating rods 15. A fourth motor 14 is installed at one end of the dust suction cover 13. The output end of the fourth motor 14 is connected to one end of the rotating rod 15. A debris collection box 17 is installed on the top side of the support frame 5. A dust suction pipe 18 is connected between the dust suction cover 13 at the bottom end and the debris collection box 17. A short dust suction pipe 19 is connected to the dust suction cover 13 at the upper end, and the other end of the short dust suction pipe 19 is connected to the dust suction pipe 18. A negative pressure pump 20 is installed on the top side of the debris collection box 17. An air extraction pipe 21 is connected to the input hole of the negative pressure pump 20. An exhaust pipe 22 is connected to the output hole of the negative pressure pump 20; during the grinding process, the negative pressure pump 20 is started, so that the gas in the debris collection box 17 is extracted through the air extraction pipe 21 and discharged through the exhaust pipe 22, making the inside of the debris collection box 17 in a negative pressure state. Thus, the debris generated during the grinding process can be sucked into the debris collection box 17 through the dust suction pipe 18 and the short dust suction pipe 19, so that the debris generated during the grinding process can be cleaned and collected in time, avoiding the phenomenon of debris flying everywhere and ensuring the quality of the working environment; since the debris generated by the grinding of the aluminum plate may contain relatively large particles or long strip-shaped metal sheets, these large debris are easy to block the pipeline. Through the operation of the fourth motor 14, the spiral crushing blades 16 rotate, so that crushing treatment can be carried out, and these large debris can be crushed into smaller particles, so as to be smoothly sucked into the debris collection box 17, avoiding the phenomenon of pipeline blockage.

[0024] A filter screen plate 23 is arranged in the debris collection box 17, and the filter screen plate 23 is arranged around the port of the air extraction pipe 21. A slag discharge port is provided on one side wall of the debris collection box 17. Limit sliding rails 24 are fixedly connected to both sides of the port of the slag discharge port. A sealing cover plate 25 is slidably assembled with the two limit sliding rails 24; when using this device, by setting the filter screen plate 23, the air extraction pipe 21 can be prevented from being blocked, ensuring the normal progress of the dust suction operation. By setting the slag discharge port, it is convenient to take out the debris collected in the debris collection box 17.

[0025] Please refer to Figure 5 As shown in the figure, two conveying rollers 31 are installed between two support plates 1 at the same end through a rotating shaft in a matching manner. A fifth motor 32 is installed on the two support plates 1. The output end of the fifth motor 32 is connected to one end of one of the rotating shafts; when conveying the aluminum plate, first place the aluminum plate on the conveying rollers 31, and start the fifth motor 32 to make the conveying rollers 31 rotate, so that the aluminum plate can be automatically conveyed.

[0026] Please refer to Figure 5As shown, a fixed plate 26 is fixedly connected to each support plate 1. An air cylinder 27 is installed on each fixed plate 26. The acting end of the air cylinder 27 is equipped with a pneumatic rod, and the other end of the pneumatic rod is fixedly connected to a limiting plate 28. Fixed blocks 29 are fixedly connected to both side walls of each fixed plate 26. A rod hole is formed in each fixed block 29, and a limiting rod 30 is inserted into each rod hole, and one end of the limiting rod 30 is fixedly connected to the limiting plate 28. When conveying the aluminum plate, start the air cylinder 27 to make the pneumatic rod drive the limiting plate 28 to move, so that the two limiting plates 28 approach each other, thereby being able to limit both sides of the aluminum plate and avoiding the phenomenon of the aluminum plate shifting during the conveying process. By setting the limiting rod 30, the limiting plate 28 can move stably, improving the stability of the movement of the limiting plate 28.

[0027] Working principle: Since there are still some problems when the above-mentioned aluminum alloy die-casting part grinding device is in use. When grinding the aluminum plate, only one side of the aluminum plate can be ground at a time. Since only one side can be ground at a time, to complete the grinding of both sides of the aluminum plate, the aluminum plate needs to be flipped and the operation repeated. The operation steps are rather cumbersome, increasing the overall time required for grinding, greatly reducing the grinding efficiency, and the separate grinding of both sides may result in inconsistent grinding effects, thus affecting the processing quality of the product. Therefore, in view of the above problems, an aluminum alloy die-casting part grinding device is proposed. When grinding the aluminum plate, first start the third motor 11 to make the lead screw 12 rotate, forcing the lifting block 7 to move downward in the limiting sliding groove 6, and then the second housing 8 and the upper grinding wheel 9 also move downward accordingly. When the upper grinding wheel 9 moves downward until it contacts the top side of the aluminum plate, start the first motor 4 and the second motor 10 to make the lower grinding wheel 3 and the upper grinding wheel 9 rotate. When the aluminum plate is conveyed through between the lower grinding wheel 3 and the upper grinding wheel 9, the grinding treatment of both sides of the aluminum plate can be completed, thereby being able to grind both sides of the aluminum plate simultaneously, significantly reducing the time for flipping the aluminum plate and repositioning, thus shortening the time required for the entire grinding process and greatly improving the grinding efficiency. And grinding both sides simultaneously can ensure that both sides of the aluminum plate are processed under the same conditions, avoiding the problem of inconsistent grinding effects caused by condition differences, which helps to improve the overall quality and appearance consistency of the product.

[0028] During the grinding process, the negative pressure pump 20 is started, so that the gas in the debris collection box 17 is pumped out through the suction pipe 21 and discharged through the exhaust pipe 22, making the inside of the debris collection box 17 in a negative pressure state. Thus, the debris generated during the grinding process can be sucked into the debris collection box 17 through the dust suction pipe 18 and the short dust suction pipe 19, so that the debris generated during the grinding process can be cleaned and collected in time, avoiding the phenomenon of debris flying everywhere and ensuring the quality of the working environment. Since the debris generated by the grinding of the aluminum plate may contain relatively large particles or long strip-shaped metal sheets, these large debris are likely to block the pipeline. By the operation of the fourth motor 14, the spiral crushing blade 16 rotates, so that crushing treatment can be carried out, and these large debris can be crushed into smaller particles, so that they can be smoothly sucked into the debris collection box 17, avoiding the phenomenon of pipeline blockage.

[0029] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. An aluminum alloy die-casting grinding device, characterized in that: It includes four support plates (1); a first housing (2) is fixedly connected to the bottom sides of the four support plates (1). A lower grinding wheel (3) is installed in the first housing (2) through a first rotating shaft. A first motor (4) is installed on one side wall of the first housing (2), and the output end of the first motor (4) is connected to one end of the first rotating shaft. The four support plates (1) are fixedly connected to form a support frame (5). Limiting sliding grooves (6) are opened on both sides of the support frame (5). Lifting blocks (7) are arranged in both of the two limiting sliding grooves (6). A second housing (8) is fixedly connected between the two lifting blocks (7). An upper grinding wheel (9) is installed in the second housing (8) through a second rotating shaft. A second motor (10) is installed on one side wall of the second housing (8), and the output end of the second motor (10) is connected to one end of the second rotating shaft. Two third motors (11) are installed on the top sides of the support plates (1). A lead screw (12) is installed at the output end of the third motor (11). The bottom end of the lead screw (12) is rotatably installed on the bottom inner wall of the limiting sliding groove (6), and the lead screw (12) penetrates through the lifting block (7). Dust suction ports are opened on both the first housing (2) and the second housing (8). Dust suction covers (13) are fixedly connected to the ports of the two dust suction ports. A rotating rod (15) is rotatably installed in each of the two dust suction covers (13). Spiral crushing blades (16) are sleeved on the outer surface of the rotating rod (15). A fourth motor (14) is installed at one end of the dust suction cover (13), and the output end of the fourth motor (14) is connected to one end of the rotating rod (15).

2. The aluminum alloy die-casting part grinding device according to claim 1, characterized in that: A debris collection box (17) is installed on the top side of the support frame (5). A dust suction pipe (18) is connected between the dust suction cover (13) at the bottom end and the debris collection box (17). A short dust suction pipe (19) is connected to the dust suction cover (13) at the upper end, and the other end of the short dust suction pipe (19) is connected to the dust suction pipe (18). A negative pressure pump (20) is installed on the top side of the debris collection box (17). An air extraction pipe (21) is connected to the input hole of the negative pressure pump (20), and an exhaust pipe (22) is connected to the output hole of the negative pressure pump (20).

3. The aluminum alloy die-casting part grinding device according to claim 2, wherein: A filter screen plate (23) is arranged in the debris collection box (17), and the filter screen plate (23) is arranged around the port of the air extraction pipe (21). A slag discharge port is opened on one side wall of the debris collection box (17). Limiting sliding rails (24) are fixedly connected to both sides of the port of the slag discharge port. A sealing cover plate (25) is slidably assembled with the two limiting sliding rails (24).

4. An aluminum alloy die-casting grinding device according to claim 1, characterized in that: Conveyor rollers (31) are installed between two support plates (1) at the same end through a rotating shaft. A fifth motor (32) is installed on two of the support plates (1), and the output end of the fifth motor (32) is connected to one end of one of the rotating shafts.

5. A grinding device for aluminum alloy die-castings according to claim 1, characterized in that: A fixed plate (26) is fixedly connected to each support plate (1), and a pneumatic cylinder (27) is installed on each fixed plate (26). The acting end of the pneumatic cylinder (27) is equipped with a pneumatic rod, and the other end of the pneumatic rod is fixedly connected to a limiting plate (28).

6. The grinding device for aluminum alloy die-castings according to claim 5, wherein: Fixed blocks (29) are fixedly connected to both side walls of each fixed plate (26). A rod hole is formed in each fixed block (29), and a limiting rod (30) is inserted into each rod hole. One end of the limiting rod (30) is fixedly connected to the limiting plate (28).

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