Air separation equipment for oxygen-air separation

Abstract

The utility model discloses air separation equipment for oxygen-air separation. The air separation equipment comprises a separation box, when impurities falling off by knocking are adsorbed, a power motor drives a transmission column, a first belt pulley, a second belt pulley and an air exhaust fan to rotate to exhaust and adsorb the impurities falling off by knocking, and the impurities fall into a collecting groove formed in the top of a V-shaped fixing block and then are adsorbed into an activated carbon adsorption plate; when the activated carbon adsorption plate needs to be replaced, a cleaning door is opened, a rotating column is rotated to drive a rotating plate to overturn outwards, the rotating plate drives a connecting block, a fixing column, a connecting plate, a moving plate, a reset spring and a bevel fixing block to move outwards, and when the bevel fixing block is separated from a fixing hole, the activated carbon adsorption plate can be taken out, so that the advantage of convenience in air filtration is achieved; and through cooperative use of the linkage adsorption mechanism and the reset fixing mechanism, air suction adsorption can be conducted on impurities falling off after knocking, an activated carbon adsorption plate can be rapidly replaced, and air separation is not limited.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation, in particular to an air separation device for oxygen-air separation. Background Art

[0002] Air separation equipment: It is the key device to achieve oxygen-air separation, mainly including the following types: air compressor: compresses air to a certain pressure; pre-cooling unit: lowers air temperature and reduces moisture; purification equipment: removes impurities in the air; heat exchanger: used for cooling and heating air; distillation tower: separates oxygen, nitrogen and other components; expander: generates cold; storage and transportation equipment: stores and transports separated oxygen. These equipment achieve the purpose of separating oxygen from other gases in the air through complex process flows;

[0003] Air separation equipment is widely used in the fields of steel, chemical industry, medical treatment, etc. Its advantages include, and the patent announcement number is CN218221706U, an air separation equipment is announced, including a first separation box and a second separation box, the first separation box and the second separation box are connected by a connecting pipe, the inner bottom of the first separation box is provided with a pool, the side of the first separation box is connected with an air duct, the end of the air duct is connected to the pool, and the interior of the second separation box is sequentially installed with a first molecular sieve and a second molecular sieve. The utility model can precipitate and filter dust in the air by setting the first separation box and the water pool in the first separation box to ensure the cleanliness of the air. The filtered air can effectively separate the rare gas in the air through the setting of the first molecular sieve and the second molecular sieve. At the same time, two knocking balls are provided in the second separation box, and the dust accumulated on the first molecular sieve and the second molecular sieve can be knocked down by the movement of the knocking balls.

[0004] The above-mentioned prior art solution has the following defects: when filtering the air after separation, impurities in the air will be adsorbed on the surface of the filter plate, and the impurities on the surface of the filter plate will be knocked into the collection tank of the filter box by knocking the filter plate with a knocking component. When the air continues to be filtered, the impurities that fall will be adsorbed on the filter plate again, and the equipment needs to be shut down for cleaning, which brings inconvenience to air separation during the cleaning process, thereby increasing the limitations of air separation. Summary of the invention

[0005] In order to solve the problems raised in the above-mentioned background technology, the purpose of the utility model is to provide an air separation device for oxygen-air separation, which has the advantage of facilitating air filtration and solves the problem that when filtering the air after separation, impurities in the air will be adsorbed on the surface of the filter plate, and the impurities on the surface of the filter plate are knocked into the collecting tank of the filter box by knocking the filter plate with a knocking component. When the air continues to be filtered, the impurities that fall will be adsorbed on the filter plate again, and the equipment needs to be shut down for cleaning, which brings inconvenience to air separation during the cleaning process, thereby increasing the problem of limitations of air separation.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an air separation device for oxygen-air separation, comprising a separation box, a filter box is arranged on the right side of the separation box, a connecting pipe is fixedly connected to the top of the separation box, the right side of the connecting pipe is fixedly connected to the left side of the filter box, an exhaust assembly is arranged on the right side of the filter box, the left side of the exhaust assembly penetrates into the interior of the filter box, a filter plate is arranged inside the filter box, the number of the filter plates is two, a V-shaped fixing block is fixedly connected to the bottom of the inner side of the filter plate, a collecting groove is provided on the inner side of the V-shaped fixing block, the number of the collecting grooves is two, a limiting slide groove is provided on the left and right sides of the bottom of the V-shaped fixing block, a slider is provided inside the limiting slide groove, a fixing hole is provided on the left and right front sides of the slider, an activated carbon adsorption plate is fixedly connected to the bottom of the slider, a cleaning door is provided on the front side of the activated carbon adsorption plate, a linkage adsorption mechanism is provided on the bottom of the activated carbon adsorption plate, and a reset fixing mechanism is provided on the front side of the inner wall of the V-shaped fixing block;

[0007] The linkage adsorption mechanism is used to vacuum and adsorb the impurities that fall due to knocking;

[0008] The resetting and fixing mechanism is used to fix and separate the activated carbon adsorption plate.

[0009] As a preferred embodiment of the utility model, the linked adsorption mechanism includes a power motor and a transmission column, the output end of the power motor is fixedly connected to the bottom of the transmission column, the surface of the transmission column is movably sleeved with a support frame, the bottom of the support frame is fixedly connected to the bottom of the inner wall of the filter box, the surface of the transmission column is fixedly connected with pulley 1, the rear side of pulley 1 is connected to pulley 2 through a belt, the tops of pulley 1 and pulley 2 are both fixedly connected with exhaust fans, the bottom of pulley 2 is movably connected to a base through a pin shaft, and the bottom of the base is fixedly connected to the bottom of the inner wall of the filter box.

[0010] The cam is secured to the rear of the unit and is configured to engage the cam of the control panel and to engage with the control panel on a rear portion of the control panel, the cam being secured to the rear of the unit and being capable of being engaged with the control panel.

[0011] As a preferred embodiment of the utility model, reinforcement sleeves are fixedly installed on the top and bottom of the surface of the fixing column, the outer side of the reinforcement sleeve is fixedly connected to the inner side of the connecting plate, and the reinforcement sleeve is located inside the V-shaped fixing block.

[0012] As a preferred embodiment of the utility model, a reinforcing sleeve is fixedly connected to the rear side of the rotating column surface, the rear side of the reinforcing sleeve is fixedly connected to the front side of the rotating disk, and the reinforcing sleeve is located inside the V-shaped fixing block.

[0013] As a preferred embodiment of the utility model, the surface movable sleeve of the rotating column is provided with a wear-resistant sleeve, the outer side of the wear-resistant sleeve is fixedly connected to the inner side of the front side of the V-shaped fixed block, and the wear-resistant sleeve is located on the front side of the rotating disk.

[0014] As a preferred embodiment of the utility model, a rotating block is arranged on the front side of the V-shaped fixed block, the rear side of the rotating block is fixedly connected to the front side of the rotating column, and the rotating block is made of hard rubber.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0016] 1. The utility model starts a power motor when adsorbing impurities that fall due to knocking, and the power motor drives the transmission column, pulley one, pulley two and the exhaust fan to rotate to extract and adsorb the impurities that fall due to knocking, and the impurities fall into the collecting groove opened on the top of the V-shaped fixed block and are then adsorbed inside the activated carbon adsorption plate. When the activated carbon adsorption plate needs to be replaced, the cleaning door is opened, and the rotating column is rotated. The rotating column drives the rotating plate to flip outward, and the rotating plate drives the connecting block, the fixed column, the connecting plate, the moving plate, the reset spring and the oblique fixed block to move outward. When the oblique fixed block is separated from the fixed hole, the activated carbon adsorption plate can be taken out and replaced, thereby having the advantage of being convenient for air filtration. Through the coordinated use of the linkage adsorption mechanism and the reset fixing mechanism, the impurities that fall due to knocking can be extracted and adsorbed, and the activated carbon adsorption plate can be quickly replaced, and there is no limitation in air separation.

[0017] 2. The utility model is provided with a linkage adsorption mechanism, which can vacuum and adsorb the impurities that fall due to knocking, thereby preventing the fallen impurities from being re-adsorbed on the surface of the filter plate, facilitating air filtration and improving the efficiency of air filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of the filter box of the utility model;

[0020] Figure 3 This is a diagram of an activated carbon adsorption plate of the utility model;

[0021] Figure 4 It is a three-dimensional diagram of the V-shaped fixing block of the utility model;

[0022] Figure 5 It is a three-dimensional diagram of the rotating column of the utility model;

[0023] Figure 6 It is a three-dimensional diagram of the power motor of the utility model.

[0024] In the figure: 1, separation box; 2, filter box; 3, connecting pipe; 4, exhaust assembly; 5, filter plate; 6, V-shaped fixing block; 7, collecting tank; 8, limit slide groove; 9, slider; 10, fixing hole; 11, activated carbon adsorption plate; 12, cleaning door; 13, linkage adsorption mechanism; 1301, power motor; 1302, transmission column; 1303, support frame; 1304, pulley 1; 1305, pulley 2; 1306, pulley 3; 1307, pulley 4; 1308, pulley 5; 1309, pulley 6; 1310, pulley 7; 1311, pulley 8; 1312, pulley 9; 1313, pulley 10; 1314, pulley 11; 1315, pulley 12; 1316, pulley 1317, pulley 1318, pulley 1319, pulley 1400, pulley 1411 6. Exhaust fan; 1307. Base; 14. Reset and fixation mechanism; 1401. Oblique fixing block; 1402. Reset spring; 1403. Moving plate; 1404. Fixing column; 1405. Connecting plate; 1406. Connecting block; 1407. Rotating plate; 1408. Rotating disk; 1409. Fixed seat; 1410. Rotating column; 15. Reinforcement sleeve; 16. Strengthening sleeve; 17. Wear-resistant sleeve; 18. Rotating block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figures 1 to 6 As shown, an air separation device for oxygen-air separation provided by the utility model comprises a separation box 1, a filter box 2 is arranged on the right side of the separation box 1, a connecting pipe 3 is fixedly connected to the top of the separation box 1, the right side of the connecting pipe 3 is fixedly connected to the left side of the filter box 2, a suction assembly 4 is arranged on the right side of the filter box 2, the left side of the suction assembly 4 penetrates into the interior of the filter box 2, a filter plate 5 is arranged inside the filter box 2, the number of the filter plates 5 is two, a V-shaped fixing block 6 is fixedly connected to the bottom of the inner side of the filter plate 5, a collecting groove 7 is provided on the inner side of the V-shaped fixing block 6, the number of the collecting grooves 7 is two, a limiting slide groove 8 is provided on the left and right sides of the bottom of the V-shaped fixing block 6, a slider 9 is provided inside the limiting slide groove 8, a fixing hole 10 is provided on the left and right front sides of the slider 9, an activated carbon adsorption plate 11 is fixedly connected to the bottom of the slider 9, a cleaning door 12 is provided on the front side of the activated carbon adsorption plate 11, a linkage adsorption mechanism 13 is provided at the bottom of the activated carbon adsorption plate 11, and a reset fixing mechanism 14 is provided on the front side of the inner wall of the V-shaped fixing block 6;

[0027] The linkage adsorption mechanism 13 is used to vacuum and adsorb the impurities that fall due to knocking;

[0028] The resetting and fixing mechanism 14 is used to fix and separate the activated carbon adsorption plate 11 .

[0029] refer to Figure 6The linkage adsorption mechanism 13 includes a power motor 1301 and a transmission column 1302, the output end of the power motor 1301 is fixedly connected to the bottom of the transmission column 1302, the surface of the transmission column 1302 is movably sleeved with a support frame 1303, the bottom of the support frame 1303 is fixedly connected to the bottom of the inner wall of the filter box 2, the surface of the transmission column 1302 is fixedly connected with a pulley 1304, the rear side of the pulley 1 1304 is connected to a pulley 2 1305 through a belt, the tops of the pulleys 1304 and 1305 are fixedly connected with an exhaust fan 1306, the bottom of the pulley 2 1305 is movably connected to a base 1307 through a pin shaft, and the bottom of the base 1307 is fixedly connected to the bottom of the inner wall of the filter box 2.

[0030] As a technical optimization solution of the utility model, by setting up a linkage adsorption mechanism 13, impurities that fall due to knocking can be vacuumed and adsorbed, avoiding the re-adsorption of the fallen impurities on the surface of the filter plate 5, facilitating air filtration and improving the efficiency of air filtration.

[0031] refer to Figure 5 The reset fixing mechanism 14 includes an oblique fixing block 1401 and a reset spring 1402. The number of the oblique fixing blocks 1401 is several, and the several oblique fixing blocks 1401 are distributed at equal distances. The reset spring 1402 is movably sleeved on the surface of the oblique fixing block 1401. The outer side of the oblique fixing block 1401 is fixedly connected with a moving plate 1403. The outer side of the reset spring 1402 is fixedly connected to the inner side of the moving plate 1403. The inner side of the reset spring 1402 is fixedly connected to the outer side of the inner wall of the V-shaped fixing block 6. The outer side of the moving plate 1403 is provided with a fixing column 1404. The outer side of the fixing column 1404 is fixedly connected with A connecting plate 1405, the inner side of the connecting plate 1405 is fixedly connected to the outer side of the movable plate 1403, a connecting block 1406 is movably sleeved on the surface of the fixed column 1404, the outer side of the connecting block 1406 is movably connected to a rotating plate 1407 through a pin shaft, the outer side of the rotating plate 1407 is fixedly connected to a rotating disk 1408 through a pin shaft, the rear side of the rotating disk 1408 is movably connected to a fixed seat 1409 through a pin shaft, the rear side of the fixed seat 1409 is fixedly connected to the rear side of the inner wall of the V-shaped fixed block 6, the front side of the rotating disk 1408 is fixedly connected to a rotating column 1410, and the front side of the rotating column 1410 extends to the front side of the V-shaped fixed block 6.

[0032] As a technical optimization solution of the utility model, by setting a reset fixing mechanism 14, the activated carbon adsorption plate 11 can be fixed and separated, avoiding the problem that the activated carbon adsorption plate 11 cannot be quickly fixed and separated, and improving the use effect of the activated carbon adsorption plate 11.

[0033] refer to Figure 5A reinforcement sleeve 15 is fixedly installed on the top and bottom of the surface of the fixing column 1404 , and the outer side of the reinforcement sleeve 15 is fixedly connected to the inner side of the connecting plate 1405 , and the reinforcement sleeve 15 is located inside the V-shaped fixing block 6 .

[0034] As a technical optimization solution of the utility model, by setting a reinforcement sleeve 15, the fixed column 1404 and the connecting plate 1405 can be reinforced, thereby avoiding looseness between the fixed column 1404 and the connecting plate 1405, reinforcing the left and right of the fixed column 1404 and the connecting plate 1405, and improving the stability between the fixed column 1404 and the connecting plate 1405.

[0035] refer to Figure 5 A reinforcing sleeve 16 is fixedly connected to the rear side of the surface of the rotating column 1410 , and the rear side of the reinforcing sleeve 16 is fixedly connected to the front side of the rotating disk 1408 . The reinforcing sleeve 16 is located inside the V-shaped fixing block 6 .

[0036] As a technical optimization solution of the utility model, by setting a reinforcement sleeve 16, the force-bearing area between the rotating column 1410 and the rotating disk 1408 can be increased, thereby avoiding breakage between the rotating column 1410 and the rotating disk 1408, increasing the force-bearing area, and improving the coordination effect between the rotating column 1410 and the rotating disk 1408.

[0037] refer to Figure 5 The surface movable sleeve of the rotating column 1410 is provided with a wear-resistant sleeve 17, the outer side of the wear-resistant sleeve 17 is fixedly connected to the inner side of the front side of the V-shaped fixed block 6, and the wear-resistant sleeve 17 is located on the front side of the rotating disk 1408.

[0038] As a technical optimization solution of the utility model, by providing a wear-resistant sleeve 17, the surface of the rotating column 1410 can be protected, thereby avoiding wear of the rotating column 1410 during use, causing damage to the rotating column 1410, and improving the durability of the rotating column 1410.

[0039] refer to Figure 5 A rotating block 18 is provided on the front side of the V-shaped fixed block 6, and the rear side of the rotating block 18 is fixedly connected to the front side of the rotating column 1410. The rotating block 18 is made of hard rubber.

[0040] As a technical optimization solution of the utility model, by setting the rotating block 18, the contact area of ​​the rotating column 1410 can be increased when in use, thereby avoiding the rotating column 1410 from slipping during use, increasing the contact area, and improving the usability of the rotating column 1410.

[0041] The working principle and use process of the utility model are as follows: when using the utility model, when adsorbing impurities that fall due to knocking, start the power motor 1301, the power motor 1301 drives the transmission column 1302, the pulley 1304, the pulley 2 1305 and the exhaust fan 1306 to rotate to extract and adsorb the impurities that fall due to knocking, the impurities fall into the collecting groove 7 opened on the top of the V-shaped fixed block 6 and then adsorbed inside the activated carbon adsorption plate 11, when the activated carbon adsorption plate 11 needs to be replaced, open the cleaning door 12, rotate the rotating column 1410, the rotating column 1410 drives the rotating plate 1407 to flip outward, the rotating plate 1407 drives the connecting block 1406, the fixed column 1404, the connecting plate 1405, the movable plate 1403, the reset spring 1402 and the oblique fixed block 1401 to move outward, when the oblique fixed block 1401 is separated from the fixing hole 10, the activated carbon adsorption plate 11 can be taken out and replaced, thereby having the advantage of facilitating air filtration.

[0042] In summary: the air separation equipment for oxygen-air separation, through the coordinated use of the separation box 1, the filter box 2, the connecting pipe 3, the exhaust assembly 4, the filter plate 5, the V-shaped fixing block 6, the collecting groove 7, the limiting slide groove 8, the slider 9, the fixing hole 10, the activated carbon adsorption plate 11, the cleaning door 12, the linkage adsorption mechanism 13 and the resetting fixing mechanism 14, solves the problem that when the air after separation is filtered, the impurities in the air will be adsorbed on the surface of the filter plate, and the impurities on the surface of the filter plate are knocked into the collecting groove of the filter box by knocking the filter plate by the knocking assembly. When the air continues to be filtered, the impurities that fall will be adsorbed on the filter plate again, so the equipment needs to be shut down for cleaning, which brings inconvenience to the air separation during the cleaning process, thereby increasing the problem of limitations of air separation.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air separation device for separating oxygen from air, comprising a separation box (1), characterized in that: A filter box (2) is arranged on the right side of the separation box (1), a connecting pipe (3) is fixedly connected to the top of the separation box (1), the right side of the connecting pipe (3) is fixedly connected to the left side of the filter box (2), an air extraction component (4) is arranged on the right side of the filter box (2), the left side of the air extraction component (4) penetrates into the interior of the filter box (2), a filter plate (5) is arranged inside the filter box (2), the number of the filter plates (5) is two, a V-shaped fixing block (6) is fixedly connected to the bottom of the inner side of the filter plate (5), and a collecting groove (7) is provided on the inner side of the V-shaped fixing block (6). The number of the collecting grooves (7) is two, the left and right sides of the bottom of the V-shaped fixed block (6) are both provided with limit slide grooves (8), a slider (9) is provided inside the limit slide groove (8), the front sides of the left and right sides of the slider (9) are both provided with fixing holes (10), the bottom of the slider (9) is fixedly connected with an activated carbon adsorption plate (11), the front side of the activated carbon adsorption plate (11) is provided with a cleaning door (12), the bottom of the activated carbon adsorption plate (11) is provided with a linkage adsorption mechanism (13), and the front side of the inner wall of the V-shaped fixed block (6) is provided with a reset fixing mechanism (14); The linkage adsorption mechanism (13) is used to vacuum and adsorb impurities that fall due to knocking; The resetting and fixing mechanism (14) is used to fix and separate the activated carbon adsorption plate (11).

2. An air separation device for separating oxygen from air according to claim 1, characterized in that: The linkage adsorption mechanism (13) comprises a power motor (1301) and a transmission column (1302); the output end of the power motor (1301) is fixedly connected to the bottom of the transmission column (1302); a support frame (1303) is movably sleeved on the surface of the transmission column (1302); the bottom of the support frame (1303) is fixedly connected to the bottom of the inner wall of the filter box (2); a pulley 1 (1304) is fixedly connected to the surface of the transmission column (1302); the rear side of the pulley 1 (1304) is connected to a pulley 2 (1305) via a belt; the tops of the pulley 1 (1304) and the pulley 2 (1305) are both fixedly connected to an exhaust fan (1306); the bottom of the pulley 2 (1305) is movably connected to a base (1307) via a pin; the bottom of the base (1307) is fixedly connected to the bottom of the inner wall of the filter box (2).

3. The air separation device for separating oxygen from air according to claim 1, characterized in that: The reset fixing mechanism (14) comprises an oblique fixing block (1401) and a reset spring (1402); the number of the oblique fixing blocks (1401) is multiple, and the multiple oblique fixing blocks (1401) are distributed at equal distances; the reset spring (1402) is movably sleeved on the surface of the oblique fixing block (1401); the outer side of the oblique fixing block (1401) is fixedly connected to a moving plate (1403); the outer side of the reset spring (1402) is fixedly connected to the inner side of the moving plate (1403); the inner side of the reset spring (1402) is fixedly connected to the outer side of the inner wall of the V-shaped fixing block (6); the outer side of the moving plate (1403) is provided with a fixing column (1404); the outer side of the fixing column (1404) is fixedly connected to a connecting rod (1403); A connecting plate (1405), the inner side of the connecting plate (1405) is fixedly connected to the outer side of the movable plate (1403), the surface of the fixed column (1404) is movably sleeved with a connecting block (1406), the outer side of the connecting block (1406) is movably connected to a rotating plate (1407) via a pin shaft, the outer side of the rotating plate (1407) is fixedly connected to a rotating disk (1408) via a pin shaft, the rear side of the rotating disk (1408) is movably connected to a fixed seat (1409) via a pin shaft, the rear side of the fixed seat (1409) is fixedly connected to the rear side of the inner wall of the V-shaped fixed block (6), the front side of the rotating disk (1408) is fixedly connected to a rotating column (1410), and the front side of the rotating column (1410) extends through the front side of the V-shaped fixed block (6).

4. The air separation device for separating oxygen from air according to claim 3, characterized in that: A reinforcement sleeve (15) is fixedly mounted on the top and bottom of the surface of the fixing column (1404), the outer side of the reinforcement sleeve (15) is fixedly connected to the inner side of the connecting plate (1405), and the reinforcement sleeve (15) is located inside the V-shaped fixing block (6).

5. The air separation device for separating oxygen from air according to claim 3, characterized in that: A reinforcing sleeve (16) is fixedly connected to the rear side of the surface of the rotating column (1410), the rear side of the reinforcing sleeve (16) is fixedly connected to the front side of the rotating disk (1408), and the reinforcing sleeve (16) is located inside the V-shaped fixing block (6).

6. The air separation device for separating oxygen from air according to claim 3, characterized in that: The surface movable sleeve of the rotating column (1410) is provided with a wear-resistant sleeve (17), the outer side of the wear-resistant sleeve (17) is fixedly connected to the inside of the front side of the V-shaped fixed block (6), and the wear-resistant sleeve (17) is located on the front side of the rotating disk (1408).

7. The air separation device for separating oxygen from air according to claim 3, characterized in that: A rotating block (18) is provided on the front side of the V-shaped fixed block (6); the rear side of the rotating block (18) is fixedly connected to the front side of the rotating column (1410); and the rotating block (18) is made of hard rubber.

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