Rail type automatic rust removal device for inner wall of vertical storage tank

Abstract

The application discloses a track type automatic rust removal device for the inner wall of a vertical storage tank and relates to the technical field of rust removal devices.The device comprises a base, a placing rack is fixed to the top of the base, a rotary support platform is fixed to the top of the base, an electric push rod one is fixed to the top of the rotating table of the rotary support platform, a supporting column is fixed to the top of the telescopic end of the electric push rod one, a storage box is fixed to the outer wall of the supporting column, a hose is fixed to the outer wall of the storage box, a sand blasting gun is fixed to the end of the hose away from the storage box, and an L-shaped frame is fixed to the outer wall of the sand blasting gun.The hollow frame, the electric push rod two, the L-shaped block and the round rod are matched to enable the sand blasting gun to move back and forth at the position, prolong the sand blasting time, and ensure that rust layers are completely removed, so that the problems that rust areas are excessively treated in traditional sand blasting uniform sweeping and rust areas are not completely cleaned in thick rust areas are avoided.

Description

Technical Field

[0001] This invention relates to the field of rust removal equipment technology, specifically to a track-type automatic rust removal device for the inner wall of a vertical storage tank. Background Technology

[0002] Rust removal equipment is a device used for surface rust removal. This device can efficiently remove rust, oxide layer and impurities from the inner wall of storage tanks through techniques such as high-pressure sandblasting or shot blasting.

[0003] Chinese patent publication number CN215278175U discloses a track-type automatic rust removal and spraying device for the inner wall of a vertical storage tank, including a ring track and a column. An integrated railcar capable of moving along the column is mounted on the column, and a spraying and / or rust removal mechanism is mounted on the integrated railcar. The column consists of a vertical section column, a transition section column, and an inclined section column from bottom to top. A fixing component is mounted on the free end of the inclined section column, and a track-moving wheel set is mounted on the lower end of the vertical section column. The track-moving wheel set cooperates with the ring track and can move along the ring track.

[0004] However, current rust removal devices have the following problems: When using traditional sandblasting to uniformly sweep rust spots on the inner wall of vertical storage tanks, the sandblasting gun may over-treat thin rust areas and fail to thoroughly clean thick rust when the thickness of the rust spots is inconsistent. Therefore, we propose a track-type automatic rust removal device for the inner wall of vertical storage tanks. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a track-mounted automatic rust removal device for the inner wall of vertical storage tanks, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a track-type automatic rust removal device for the inner wall of a vertical storage tank, comprising a base, a placement frame fixed to the top of the base, a rotary support platform fixed to the top of the base, an electric push rod fixed to the top of the rotating platform, a support column fixed to the top of the telescopic end of the electric push rod, a storage box fixed to the outer wall of the support column, a flexible hose fixed to the outer wall of the storage box, a sandblasting gun fixed to the end of the flexible hose away from the storage box, an L-shaped frame fixed to the outer wall of the sandblasting gun, an L-shaped frame fixed to the top of the support column at the end of the L-shaped frame away from the sandblasting gun, a camera fixed to the side of the L-shaped frame, a drive pump fixed to the outer wall of the storage box, a hollow frame fixed to the side of the L-shaped frame, an electric push rod two fixed to the inner wall of the hollow frame, an L-shaped block fixed to the telescopic end of the electric push rod two, the L-shaped block being slidably installed on the inner wall of the hollow frame, and a round rod fixed to the side of the L-shaped block.

[0007] According to the above technical solution, an elastic telescopic rod is fixed to the side of the L-shaped block, an L-shaped long block is fixed to the telescopic end of the elastic telescopic rod, and a scraper is fixed to the bottom of the L-shaped long block.

[0008] According to the above technical solution, the round rod and the nozzle of the sandblasting gun are arranged in parallel.

[0009] According to the above technical solution, the side of the L-shaped long block is provided with an anti-stacking device. The anti-stacking device includes an electric push rod three. The fixed end of the electric push rod three is fixed to the side of the L-shaped long block. The bottom of the telescopic end of the electric push rod three is fixed with a track plate. A vertical rod is slidably installed at the bottom of the track plate. A horizontal rod is fixed at the bottom of the vertical rod. A push plate is fixed at the bottom of the outer wall of the horizontal rod.

[0010] According to the above technical solution, the scraper has an arc-shaped track groove on its side, and one end of the crossbar is slidably installed on the inner wall of the arc-shaped track groove.

[0011] According to the above technical solution, an auxiliary device is provided on the side of the track slab. The auxiliary device includes a fixing block, which is fixed to the side of the track slab. An elastic telescopic rod II is fixed to the side of the fixing block. An L-shaped plate is fixed to the telescopic end of the elastic telescopic rod II. The bottom of the L-shaped plate is slidably installed on the top of the track slab. A hemispherical block I is fixed to the side of the L-shaped plate. A Z-shaped block is fixed to the side of the L-shaped plate. A movable block is slidably installed on the side of the L-shaped block. The side of the Z-shaped block away from the L-shaped plate is slidably installed on the inner wall of the movable block. A U-shaped plate is fixed to the side of the movable block. Several hemispherical blocks II are fixed to the side of the L-shaped block.

[0012] According to the above technical solution, several of the hemispherical blocks II are located on the displacement trajectory of hemispherical block I.

[0013] According to the above technical solution, the side of the U-shaped plate away from the moving block is arc-shaped, and the L-shaped long block is located on the displacement trajectory of the U-shaped plate.

[0014] This invention provides a track-mounted automatic rust removal device for the inner wall of a vertical storage tank. It has the following advantages: (1) The present invention uses a hollow frame, an electric push rod II, an L-shaped block and a round rod to make the sandblasting gun move back and forth in this position, extending the sandblasting time and ensuring that the rust layer is completely removed. This avoids the problem of traditional sandblasting uniformly sweeping, which over-treats thin rust areas and may not thoroughly clean thick rust. At the same time, when removing rust from the inner wall of the vertical storage tank, the scraper will first contact the cracked rust spots, thereby scraping off the cracked rust spots and instantly exposing the more "solid" rust layer or substrate below. This allows subsequent sandblasting and detection to act on the "real" surface to be treated, rather than doing useless work on a layer of "floating rust". It also avoids the problem of using high-speed and high-cost abrasive to "crush" and "grind" these loose rust blocks that can be easily removed by mechanical force, resulting in a significant increase in the consumption of sandblasting abrasive.

[0015] (2) In this invention, when the crossbar moves up and down, it will drive the push plate to move up and down. The movement of the push plate will remove the root of the cracked rust spots located on the inner wall of the vertical storage tank, and pry the cracked rust spots off the attachment surface of the inner wall of the vertical storage tank as a whole, greatly reducing the residue. At the same time, when the crossbar moves up and down along the inner wall of the arc-shaped track groove, it will move the scraped rust spots away from the inner wall of the vertical storage tank and let them fall freely to the outside of the vertical storage tank, thereby separating the "treated area" and the "to be treated area", avoiding the problem of the rust spots falling into the "treated area" and re-adhering.

[0016] (3) The present invention uses an auxiliary device to make the elastic telescopic rod II, L-shaped plate, hemispherical block I, Z-shaped block, moving block, U-shaped plate and hemispherical block II work together. When the scraper blade contacts the rust spot under vibration, it can more easily cut into the rust layer gap and "shake off" or "pry up" the rust block, instead of relying entirely on the horizontal thrust of the scraper to "bite" it. This greatly reduces the main thrust required for scraping, reduces the load on the equipment, and the vibration can effectively shake off the rust residue attached to the scraper, so that the scraper blade always keeps a "clean" and "sharp" contact state, ensuring the continuity of scraping. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the entire invention; Figure 2 This is a schematic diagram of one part of the electric actuator of the present invention; Figure 3 This is a schematic diagram of the structure of the flexible tube in this invention; Figure 4 This is a schematic diagram of the structure at the round rod of the present invention; Figure 5 This is a schematic diagram of the structure of the L-shaped elongated block in this invention; Figure 6 This is a schematic diagram of the structure of the anti-accumulation device of the present invention; Figure 7 This is a schematic diagram of the auxiliary device of the present invention. Figure 1 ; Figure 8 This is a schematic diagram of the auxiliary device of the present invention. Figure 2 .

[0018] In the diagram: 1. Base; 2. Placement rack; 3. Rotary support platform; 4. Electric push rod one; 5. Support column; 6. Storage bin; 7. Anti-stacking device; 71. Electric push rod three; 72. Track plate; 73. Vertical rod; 74. Horizontal rod; 75. Push plate; 76. Arc-shaped track groove; 8. Auxiliary device; 81. Fixed block; 82. Elastic telescopic rod two; 83. L-shaped plate; 84. Hemispherical block one; 85. Z-shaped block; 86. Moving block; 87. U-shaped plate; 88. Hemispherical block two; 9. L-shaped frame; 10. Hoses; 11. Sandblasting gun; 12. Camera; 13. Drive pump; 14. Hollow frame; 15. Electric push rod two; 16. L-shaped block; 17. Round rod; 18. Elastic telescopic rod one; 19. L-shaped long block; 20. Scraper. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Please see Figures 1-8One embodiment of the present invention is: a track-type automatic rust removal device for the inner wall of a vertical storage tank, comprising a base 1, a placement rack 2 fixed to the top of the base 1, and a rotary support platform 3 fixed to the top of the base 1. The rotary support platform 3 is composed of a rotary bearing, a fixed base, a rotating table, a motor, and other components, which are existing technologies and will not be described in detail. The motor of the rotary support platform 3 is electrically connected to an external controller. An electric push rod 4 is fixed to the top of the rotating table of the rotary support platform 3 and is electrically connected to the external controller. A support column 5 is fixed to the top of the telescopic end of the electric push rod 4. A storage box 6 is fixed to the outer wall of the support column 5. A flexible hose 10 is fixed to the outer wall of the storage box 6. A sandblasting gun 11 is fixed to the end of the flexible hose 10 away from the storage box 6. An L-shaped frame 9 is fixed to the outer wall of the sandblasting gun 11. The end of the L-shaped frame 9 away from the sandblasting gun 11 is fixed to the top of the support column 5. A camera 12 is fixed to the side of the L-shaped frame 9. The camera 12 is connected to the external controller. Electrical connection, with the image transmitted via camera 12, is existing technology and will not be elaborated further. A drive pump 13 is fixedly mounted on the outer wall of the storage box 6, and is electrically connected to an external controller. A hollow frame 14 is fixed to the side of the L-shaped frame 9, and an electric push rod 15 is fixed to the inner wall of the hollow frame 14. The electric push rod 15 is electrically connected to an external controller. An L-shaped block 16 is fixed to the telescopic end of the electric push rod 15, and the L-shaped block 16 is slidably mounted on the inner wall of the hollow frame 14. A round rod 17 is fixed to the side of the L-shaped block 16, and the round rod 17 is parallel to the nozzle of the sandblasting gun 11. With this structure, the operator restarts the electric push rod 15, causing it to move the L-shaped block 16 and the round rod 17 away from the rust spot. Then, the sandblasting gun 11 moves back and forth at this spot, extending the sandblasting time to ensure complete removal of the rust layer. This avoids the problem of traditional sandblasting's uniform sweeping, which over-treats thin rust areas and may not thoroughly clean thick rust.

[0021] An elastic telescopic rod 18 is fixed to the side of the L-shaped block 16. An L-shaped long block 19 is fixed to the telescopic end of the elastic telescopic rod 18. A scraper 20 is fixed to the bottom of the L-shaped long block 19. With the above structure, the scraper 20 will first contact the cracked rust spots, thereby scraping off the cracked rust spots. This can instantly expose the more "solid" rust layer or substrate below, allowing subsequent sandblasting and detection to act on the "real" surface to be treated, rather than doing useless work on a layer of "floating rust". It also avoids the problem of using high-speed, high-cost abrasive to "crush" and "grind" these loose rust blocks that can be easily removed by mechanical force, which would lead to a significant increase in the consumption of sandblasting abrasive.

[0022] An anti-accumulation device 7 is provided on the side of the L-shaped block 19. The anti-accumulation device 7 includes an electric push rod 71. The fixed end of the electric push rod 71 is fixed to the side of the L-shaped block 19. The bottom of the telescopic end of the electric push rod 71 is fixed to a track plate 72. A vertical rod 73 is slidably installed on the bottom of the track plate 72. A horizontal rod 74 is fixed on the bottom of the vertical rod 73. A push plate 75 is fixed on the bottom of the outer wall of the horizontal rod 74. An arc-shaped track groove 76 is opened on the side of the scraper 20. One end of the horizontal rod 74 is slidably installed on the inner wall of the arc-shaped track groove 76. With the above structure, the movement of the push plate 75 will remove the root of the cracked rust spots located on the inner wall of the vertical storage tank, and pry the cracked rust spots off the attachment surface of the inner wall of the vertical storage tank as a whole, greatly reducing the residue.

[0023] In use, when rust removal is needed on the inner wall of the vertical storage tank, the lid of the vertical storage tank is removed using external mechanical means. Then, the vertical storage tank is placed upside down on the placement rack 2. If the operator activates the electric push rod 15 via the external controller, the telescopic end of the electric push rod 15 will move the L-shaped block 16 along the inner wall of the hollow frame 14 towards the inner wall of the vertical storage tank. The movement of the L-shaped block 16 will move the round rod 17. When the L-shaped block 16 reaches the outermost edge of the hollow frame 14, there is still a one-millimeter gap between the round rod 17 and the inner wall of the vertical storage tank. At this point, the operator activates the rotary support platform 3 and the camera 12 via the external controller. The rotary support platform 3's rotating table will drive the electric push rod 4 to rotate. The rotation of electric push rod 4 causes the support column 5 to rotate, which in turn causes the storage tank 6 to rotate. The rotation of the storage tank 6 then causes the L-shaped frame 9, hose 10, and sandblasting gun 11 to rotate. Simultaneously, the drive pump 13 activates the sand inside the storage tank 6, which is then sprayed through the hose 10 from the sandblasting gun 11 onto the inner wall of the vertical storage tank, cleaning the rust spots. At the same time, the camera 12 transmits the rust removal footage to the screen of an external controller, allowing workers to monitor the rust removal process in real time. The rotation of the L-shaped frame 9 causes the hollow frame 14 to rotate, which in turn causes the electric push rod 15 to rotate, which in turn causes the L-shaped block 16 to rotate. The rotation of L-shaped block 16 will drive the round rod 17 to rotate. When the operator sees the round rod 17 encountering a thicker rust spot while rotating on the controller screen, the operator restarts the electric push rod 15, causing it to move L-shaped block 16 and round rod 17 away from the rust spot. Then, the sandblasting gun 11 moves back and forth in this area, extending the sandblasting time to ensure complete removal of the rust layer. This avoids the problem of traditional sandblasting's uniform sweeping, which over-treats thin rust areas and may not thoroughly clean thick rust. When L-shaped block 16 moves towards the inner wall of the vertical storage tank, it will drive the elastic telescopic rod 18 and L-shaped long block 19 to move. The movement of L-shaped long block 19 will cause the scraper 20 to preferentially contact... When the round rod 17 touches the inner wall of the vertical storage tank, and there is still a one-millimeter gap between the round rod 17 and the inner wall of the vertical storage tank, the scraper 20 will drive the L-shaped long block 19 to squeeze the elastic telescopic rod 18 under the reaction force of the inner wall of the vertical storage tank. Therefore, when removing rust from the inner wall of the vertical storage tank, the scraper 20 will first contact the cracked rust spots, thereby scraping off the cracked rust spots. This can instantly expose the more "solid" rust layer or substrate below, allowing subsequent sandblasting and detection to act on the "real" surface to be treated, rather than doing useless work on a layer of "floating rust". It also avoids the problem of using high-speed, high-cost abrasive to "crush" and "grind" these loose rust blocks that can be easily removed by mechanical force, which would lead to a significant increase in the consumption of sandblasting abrasive.

[0024] When scraper 20 treats cracked rust spots, the operator activates electric push rod 3 71 via an external controller. The telescopic end of electric push rod 3 71 moves track plate 72 up and down, which in turn moves vertical rod 73 up and down. Vertical rod 73 moves horizontal rod 74 up and down along the inner wall of arc-shaped track groove 76. The movement of horizontal rod 74 moves push plate 75 up and down. Push plate 75 removes the root of the cracked rust spots located on the inner wall of the vertical storage tank, prying the cracked rust spots off the adhesion surface of the inner wall of the vertical storage tank as a whole, greatly reducing residue. At the same time, when horizontal rod 74 moves up and down along the inner wall of arc-shaped track groove 76, it moves the scraped rust spots away from the inner wall of the vertical storage tank and allows them to fall freely to the outside of the vertical storage tank, thus separating the "treated area" and the "to be treated area" and preventing the rust spots from falling into the "treated area" and re-adhering.

[0025] Please see Figures 1-8 Based on the above embodiments, in another embodiment of the present invention, an auxiliary device 8 is provided on the side of the track slab 72. The auxiliary device 8 includes a fixing block 81, which is fixed to the side of the track slab 72. An elastic telescopic rod 82 is fixed to the side of the fixing block 81. An L-shaped plate 83 is fixed to the telescopic end of the elastic telescopic rod 82. The bottom of the L-shaped plate 83 is slidably mounted on the top of the track slab 72. A hemispherical block 84 is fixed to the side of the L-shaped plate 83. A Z-shaped block 85 is fixed to the side of the L-shaped plate 83. A movable block 86 is slidably mounted on the side of the L-shaped long block 19. The side of the Z-shaped block 85 away from the L-shaped plate 83 is slidably mounted on the inner wall of the movable block 86. A U-shaped plate 87 is fixed to the side of the movable block 86. Several hemispherical blocks 88 are fixed on the side of block 19. All hemispherical blocks 88 are located on the displacement trajectory of hemispherical block 84. The side of U-shaped plate 87 away from moving block 86 is arc-shaped. L-shaped long block 19 is located on the displacement trajectory of U-shaped plate 87. With the above structure, when the blade of scraper 20 contacts the rust spot under vibration, it can more easily cut into the rust layer gap and "shake off" or "pry up" the rust block, instead of relying entirely on the horizontal thrust of scraper 20 to "bite off". This greatly reduces the main thrust required for scraping, reduces the load on the equipment, and the vibration can effectively shake off the rust residue attached to scraper 20, so that the blade of scraper 20 always keeps a "clean" and "sharp" contact state, ensuring the continuity of scraping.

[0026] In use, the track plate 72 moves up and down, causing the L-shaped plate 83 and the fixing block 81 to move up and down. The up and down movement of the L-shaped plate 83 and the fixing block 81 causes the elastic telescopic rod 82 to move up and down. The up and down movement of the L-shaped plate 83 causes the hemispherical block 84 to move up and down. Simultaneously, the up and down movement of the L-shaped plate 83 causes the Z-shaped block 85 to move up and down along the inner wall of the moving block 86. When the hemispherical block 84 contacts the hemispherical block 88, the hemispherical block 84 causes the L-shaped plate 83 to compress the elastic telescopic rod 82. When the hemispherical block 84 does not contact the hemispherical block 88, the elastic telescopic rod 82 will return to its original position due to its own elasticity. The return of the elastic telescopic rod 82 causes the L-shaped plate 83 and the hemispherical block 84 to return to their original positions. This process repeats, causing the L-shaped plate 83 to move back and forth. The reciprocating motion of the L-shaped plate 83 causes the Z-shaped block 85 to move along the inner wall of the moving block 86, while simultaneously causing the moving block 86 to reciprocate along the outer wall of the L-shaped long block 19. The reciprocating motion of the moving block 86 causes the U-shaped plate 87 to reciprocate. The reciprocating motion of the U-shaped plate 87 continuously strikes the L-shaped long block 19, causing the L-shaped long block 19 and the scraper 20 to vibrate. When the scraper 20 blade contacts the rust spot under vibration, it can more easily cut into the rust layer gap and "shake off" or "pry up" the rust block, instead of relying entirely on the horizontal thrust of the scraper 20 to "bite off". This significantly reduces the main thrust required for scraping, reduces the load on the equipment, and the vibration can effectively shake off the rust residue attached to the scraper 20, keeping the scraper 20 blade in a "clean" and "sharp" contact state at all times, ensuring the continuity of scraping.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A track-type automatic rust removal device for the inner wall of a vertical storage tank, comprising a base (1), characterized in that: A placement rack (2) is fixed to the top of the base (1), a rotary support platform (3) is fixed to the top of the base (1), an electric push rod (4) is fixed to the top of the rotating platform (3), a support column (5) is fixed to the top of the telescopic end of the electric push rod (4), a storage box (6) is fixed to the outer wall of the support column (5), a hose (10) is fixed to the outer wall of the storage box (6), a sandblasting gun (11) is fixed to the end of the hose (10) away from the storage box (6), and an L-shaped frame (9) is fixed to the outer wall of the sandblasting gun (11). The end of the L-shaped frame (9) away from the sandblasting gun (11) is fixed to the top of the support column (5). A camera (12) is fixed to the side of the L-shaped frame (9). A drive pump (13) is fixed to the outer wall of the storage box (6). A hollow frame (14) is fixed to the side of the L-shaped frame (9). An electric push rod (15) is fixed to the inner wall of the hollow frame (14). An L-shaped block (16) is fixed to the telescopic end of the electric push rod (15). The L-shaped block (16) is slidably installed on the inner wall of the hollow frame (14). A round rod (17) is fixed to the side of the L-shaped block (16).

2. The track-type automatic rust removal device for the inner wall of a vertical storage tank according to claim 1, characterized in that: The side of the L-shaped block (16) is fixed with an elastic telescopic rod (18), the telescopic end of the elastic telescopic rod (18) is fixed with an L-shaped long block (19), and the bottom of the L-shaped long block (19) is fixed with a scraper (20).

3. The track-type automatic rust removal device for the inner wall of a vertical storage tank according to claim 2, characterized in that: The round rod (17) and the nozzle of the sandblasting gun (11) are arranged in parallel.

4. The track-type automatic rust removal device for the inner wall of a vertical storage tank according to claim 2, characterized in that: The L-shaped block (19) is provided with an anti-stacking device (7) on its side. The anti-stacking device (7) includes an electric push rod three (71). The fixed end of the electric push rod three (71) is fixed to the side of the L-shaped block (19). The bottom of the telescopic end of the electric push rod three (71) is fixed with a track plate (72). A vertical rod (73) is slidably installed on the bottom of the track plate (72). A horizontal rod (74) is fixed on the bottom of the vertical rod (73). A push plate (75) is fixed on the bottom of the outer wall of the horizontal rod (74).

5. The track-type automatic rust removal device for the inner wall of a vertical storage tank according to claim 4, characterized in that: The scraper (20) has an arc-shaped track groove (76) on its side, and one end of the crossbar (74) is slidably installed on the inner wall of the arc-shaped track groove (76).

6. The track-type automatic rust removal device for the inner wall of a vertical storage tank according to claim 5, characterized in that: An auxiliary device (8) is provided on the side of the track plate (72). The auxiliary device (8) includes a fixing block (81). The fixing block (81) is fixed to the side of the track plate (72). An elastic telescopic rod (82) is fixed to the side of the fixing block (81). An L-shaped plate (83) is fixed to the telescopic end of the elastic telescopic rod (82). The bottom of the L-shaped plate (83) is slidably installed on the top of the track plate (72). A hemispherical block (84) is fixed to the side of the L-shaped plate (83). A Z-shaped block (85) is fixed to the side of the L-shaped plate (83). A movable block (86) is slidably installed on the side of the L-shaped block (19). The side of the Z-shaped block (85) away from the L-shaped plate (83) is slidably installed on the inner wall of the movable block (86). A U-shaped plate (87) is fixed to the side of the movable block (86). Several hemispherical blocks (88) are fixed to the side of the L-shaped block (19).

7. A track-type automatic rust removal device for the inner wall of a vertical storage tank according to claim 6, characterized in that: Several of the hemispherical blocks two (88) are located on the displacement trajectory of hemispherical block one (84).

8. A track-type automatic rust removal device for the inner wall of a vertical storage tank according to claim 6, characterized in that: The side of the U-shaped plate (87) away from the moving block (86) is arc-shaped, and the L-shaped long block (19) is located on the displacement trajectory of the U-shaped plate (87).

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