A device for detecting a polyethylene pipe

Abstract

The application relates to the technical field of polyethylene pipe detection, and discloses a polyethylene pipe detection device, which comprises a square plate, an annular groove is arranged on the square plate, a sliding track is arranged in the annular groove, a polyethylene pipe is arranged in the annular groove, a sealing indication assembly is arranged at one end of the polyethylene pipe, a packaging and local detection assembly is arranged on the outer surface of the polyethylene pipe, a cutting assembly is arranged above the polyethylene pipe, a supporting plate is arranged in the sealing indication assembly, springs are arranged on the inner side of the supporting plate, the packaging and local detection assembly can clean and scrape off dust and chippings attached to the polyethylene pipe while packaging the polyethylene pipe, one movement can realize two effects, and the dust and chippings attached to the polyethylene pipe are cleaned and scraped off by a cleaning and scraping round table piece arranged on one side of a sliding block, then the polyethylene pipe is packaged, the device is saved in components, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polyethylene pipe detection, in particular to a polyethylene pipe detection device. BACKGROUND

[0002] Polyethylene pipe is a polyethylene pipe material, polyethylene is a high crystallinity, non-polar thermoplastic resin, and the original polyethylene is milky white, and the micro-thin section is translucent to a certain extent.

[0003] In the prior art, polyethylene pipe is usually divided into five steps: material preparation, mixing and stirring, extrusion operation, cooling and cleaning, and packaging after detection, but the cleaning of polyethylene pipe is usually just taken out after cooling in water, and the cleaning is completed, which is very perfunctory. These water attached to the polyethylene pipe needs to be manually wiped or naturally air-dried, which is not only time-consuming and laborious, but also when the polyethylene pipe is transferred for detection of the pipeline sealing, dust and debris in the air and on the ground will again be attached to the surface of the pipeline. If the dust and impurities block the cracks, the detection result will be easily affected, leading to unqualified products flowing into the market, which will affect the company's operation and reputation to some extent.

[0004] In addition, even if the polyethylene pipe is a qualified product, the pipeline with dust and debris after detection is directly packaged, which greatly reduces the quality of the product to some extent, and the cleaning, detection and packaging are distributed, the time is long, the transfer area is large, the quality of the polyethylene pipe cannot be guaranteed, and the efficiency is relatively low.

[0005] Therefore, we propose a polyethylene pipe detection device to solve the above problems. SUMMARY

[0006] (I) Technical problems to be solved

[0007] In view of the defects of the prior art, the present application provides a polyethylene pipe detection device to solve the problems in the background art.

[0008] (II) Technical scheme

[0009] To achieve the above purpose, the present application provides the following technical scheme: a polyethylene pipe detection device, comprising a square plate, the square plate is provided with an annular groove, the annular groove is provided with a sliding rail, the annular groove is provided with a polyethylene pipe, one end of the polyethylene pipe is provided with a sealing indication assembly, the outer surface of the polyethylene pipe is provided with a packaging and local detection assembly, and the polyethylene pipe is provided with a cutting assembly above the polyethylene pipe.

[0010] The sealing indicator assembly is provided with a support plate, and a spring is provided on the inner side of the support plate. A hollow sealing column is fixedly connected to the end of the spring away from the support plate. An air port is opened on the hollow sealing column. A buzzer detector is provided on one side of the support plate in the annular groove, and an indicator light is provided on one side of the buzzer detector.

[0011] Preferably, the packaging and local detection assembly includes a cleaning frustum plate, one side of which is fixedly connected to a sliding block, and the side of the sliding block away from the cleaning frustum plate is fixedly connected to an auxiliary arc plate. The auxiliary arc plate is covered with a plastic film, and rubber bands are intermittently fixedly connected to the outer surface of the plastic film. Slender strips are intermittently arranged on the plastic film, and an air pump switch is provided at one end of the annular groove.

[0012] Preferably, the cutting assembly is equipped with a height detector, the outer wall of the square plate is provided with a motion groove, a U-shaped motion strip slides in the motion groove, a moving column is slidably connected to the U-shaped motion strip, and a cutting blade is rotatably connected to the bottom end of the moving column.

[0013] Preferably, the air inlet is provided with a buzzer whistle.

[0014] Preferably, the buzzer detector and the indicator light are electrically connected.

[0015] Preferably, the plastic film is connected to the elongated strip.

[0016] Preferably, the U-shaped moving bar has a groove for the movement of the moving column, which is driven by a motor.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a detection device for polyethylene pipes, which has the following beneficial effects:

[0019] 1. In this invention, the cleaning frustum plate set on one side of the sliding block will scrape off the dust and debris attached to the polyethylene pipe as it moves with the sliding block, ensuring the cleanliness of the polyethylene pipe and preventing dust and impurities from clogging the cracks, which could easily affect the test results in subsequent testing and cause unqualified products to flow into the market.

[0020] 2. In this invention, while packaging polyethylene pipes, the cleaning frustum plate on one side of the sliding block scrapes off the dust and other debris attached to the polyethylene pipes. One movement achieves two effects, which is different from manually cleaning off the dust and other debris attached to the polyethylene pipes and then packaging them. This saves parts for the device and improves work efficiency.

[0021] 3. In this invention, the buzzer whistle set on the air inlet will make a sound when the gas is released. After the buzzer detector detects the sound, it will control the indicator light that is electrically connected to it to turn green. With the dual feedback of the buzzer sound and the green indicator light, it can be proved that the polyethylene pipe is qualified. The inspector can then pack it into the warehouse. If the polyethylene pipe has cracks or holes, the hollow sealing column will not be pushed out by the gas, and the buzzer whistle on the air inlet will not make a sound. If the buzzer detector does not detect a sound for a certain period of time, the indicator light will turn red to remind the inspector that the polyethylene pipe is not sealed properly.

[0022] 4. In this invention, before the air pump controls the air pump to pump air into the polyethylene pipe, the plastic film is already fixed to the outer surface of the polyethylene pipe by rubber bands under the action of the packaging and local detection components. That is, with the assistance of the rubber bands, the plastic film on the polyethylene pipe is divided into several sealed film cavities. When the polyethylene pipe leaks air, the gas will gradually push up the thin strips on the film cavity, i.e., on the plastic film. Under the action of the gas, the thin strips will gradually rise and eventually be in a vertical state, thus informing the inspector that this section of the polyethylene pipe is unqualified. In other words, this setting can transform the air leakage phenomenon, which is not easily observed by the human eye, into a visually intuitive and easily observable action.

[0023] 5. Through the design of the integrated device, this invention can transform the three processes of cleaning, testing, and packaging into a single process. It avoids directly packaging polyethylene pipes containing dust and debris after testing, thus preventing a significant reduction in product quality. Furthermore, since cleaning, testing, and packaging are no longer performed separately, there are no issues such as long processing times or large transfer areas, ensuring the final product quality to the greatest extent possible and achieving relatively high efficiency. Attached Figure Description

[0024] Figure 1 This is a top view of the main structure of the present invention;

[0025] Figure 2 This is a structural diagram of the main body of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle;

[0027] Figure 4 These are structural diagrams of the cleaning frustum plate, sliding block, and auxiliary arc plate in this invention;

[0028] Figure 5 This is a partial structural disassembly diagram of the packaging and partial detection components in this invention;

[0029] Figure 6 The annular groove, sliding block, and other related structures of this invention are shown in the figure. Figure 1 ;

[0030] Figure 7 The annular groove, sliding block, and other related structures of this invention are shown in the figure. Figure 2 ;

[0031] Figure 8 For the present invention Figure 1 Enlarged view of the structure at point B in the middle;

[0032] Figure 9 This is a side view of the main structure of the present invention;

[0033] Figure 10 This is a structural diagram of the air pump switch and related components of the present invention.

[0034] In the picture:

[0035] 1. Square plate; 101. Annular groove; 102. Sliding track; 2. Polyethylene pipe;

[0036] 3. Sealing indicator assembly; 301. Support plate; 302. Spring; 303. Hollow sealing column; 304. Air inlet; 305. Buzzer detector; 306. Indicator light;

[0037] 4. Packaging and local inspection components; 401. Cleaning frustum plate; 402. Sliding block; 403. Auxiliary arc plate; 404. Plastic film; 405. Rubber band; 406. Thin strip; 407. Air pump switch;

[0038] 5. Cutting assembly; 501. Height detector; 502. Motion groove; 503. U-shaped motion bar; 504. Moving column; 505. Cutting blade. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] Please refer to Figures 1 to 3 As shown:

[0043] A support plate 301 is provided inside the sealing indicator assembly 3. A spring 302 is provided inside the support plate 301. A hollow sealing column 303 is fixedly connected to the end of the spring 302 away from the support plate 301. An air port 304 is provided on the hollow sealing column 303. If there are no cracks or holes in the polyethylene pipe 2, when the air pump pumps a certain amount of gas into the polyethylene pipe 2, it will push out the hollow sealing column 303 originally installed in the polyethylene pipe 2. At this time, the gas will leak out from the air port 304. If there are cracks or holes in the polyethylene pipe 2, the hollow sealing column 303 will not move. An air port 304 is provided with a... A buzzer whistle will sound when gas passes through the gas port 304. A buzzer detector 305 is installed on one side of the gas port 304 support plate 301 on the annular groove 101. After the buzzer detector 305 detects the sound, the indicator light 306, which is electrically connected to the buzzer detector 305, will turn green. If no sound is detected for a certain period of time, the indicator light 306 will turn red to remind the inspector that the sealing of the polyethylene pipe 2 is unqualified. The buzzer detector 305 and the indicator light 306 are electrically connected, and the indicator light 306 is installed on one side of the buzzer detector 305.

[0044] Example 2

[0045] Please refer to Figures 4 to 8 , Figure 10 As shown:

[0046] The packaging and local inspection component 4 includes a cleaning frustum plate 401. During its movement, the cleaning frustum plate 401 cleans dust and related impurities from the polyethylene pipe 2. A sliding block 402 is fixedly connected to one side of the cleaning frustum plate 401, and the sliding block 402 slides in the sliding track 102. An auxiliary arc plate 403 is fixedly connected to the side of the sliding block 402 away from the cleaning frustum plate 401. A plastic film 404 is covered on the auxiliary arc plate 403, and one end of the plastic film 404 is fixed to the inner wall of the square plate 1. When the auxiliary arc plate 403 moves under the influence of the sliding block 402, the auxiliary arc plate 403... The plastic film 404 on the 3 will gradually separate from the auxiliary arc plate 403 and be fixed to the polyethylene pipe 2 under the action of the rubber band 405. The plastic film 404 is connected to the thin strip 406. The rubber band 405 is intermittently fixed on the outer surface of the plastic film 404. With the assistance of the rubber band 405, the plastic film 404 on the polyethylene pipe 2 will be divided into several sections of sealed film cavities. If the polyethylene pipe 2 leaks air, the gas will support the film cavity, that is, the thin strip 406 on the plastic film 404. The thin strip 406 is intermittently arranged on the plastic film 404. An air pump switch 407 is provided at one end of the annular groove 101.

[0047] Example 3

[0048] Please refer to Figure 2 , Figure 9 As shown:

[0049] The cutting assembly 5 is equipped with a height detector 501. If the slender strip 406 stands upright under the action of gas, the height detector 501 will detect it. A motion groove 502 is provided on the outer wall of the square plate 1. A U-shaped motion strip 503 slides in the motion groove 502. A driving device is provided on the outside of the U-shaped motion strip 503. A groove for the movement of the moving column 504 is provided on the U-shaped motion strip 503. The moving column 504 is driven by a motor. The moving column 504 is slidably connected to the U-shaped motion strip 503. A cutting blade 505 is rotatably connected to the bottom end of the moving column 504. The cutting blade 505 can cut the leaking local pipe.

[0050] Example 4

[0051] Please refer to Figures 1 to 10 As shown:

[0052] An annular groove 101 is provided on the square plate 1. A sliding track 102 is provided in the annular groove 101. A polyethylene pipe 2 is provided in the inner groove of the annular groove 101. An air pump is provided at one end of the polyethylene pipe 2. A sealing indicator component 3 is provided at one end of the polyethylene pipe 2. A packaging and local detection component 4 is provided on the outer surface of the polyethylene pipe 2. A cutting component 5 is provided above the polyethylene pipe 2.

[0053] A support plate 301 is provided inside the sealing indicator assembly 3. A spring 302 is provided inside the support plate 301. A hollow sealing column 303 is fixedly connected to the end of the spring 302 away from the support plate 301. An air port 304 is provided on the hollow sealing column 303. If there are no cracks or holes in the polyethylene pipe 2, when the air pump pumps a certain amount of gas into the polyethylene pipe 2, it will push out the hollow sealing column 303 originally installed in the polyethylene pipe 2. At this time, the gas will leak out from the air port 304. If there are cracks or holes in the polyethylene pipe 2, the hollow sealing column 303 will not move. An air port 304 is provided with a... A buzzer whistle will make a sound when gas passes through the gas port 304. A buzzer detector 305 is set on one side of the gas port 304 support plate 301 on the annular groove 101. After the buzzer detector 305 detects the sound, the indicator light 306, which is electrically connected to the buzzer detector 305, will turn green. If no sound is detected for a certain period of time, the indicator light 306 will turn red to remind the inspector that the sealing of the polyethylene pipe 2 is unqualified. The buzzer detector 305 and the indicator light 306 are electrically connected, and the indicator light 306 is set on one side of the buzzer detector 305.

[0054] The packaging and local inspection component 4 includes a cleaning frustum plate 401. During its movement, the cleaning frustum plate 401 cleans dust and related impurities from the polyethylene pipe 2. A sliding block 402 is fixedly connected to one side of the cleaning frustum plate 401, and the sliding block 402 slides in the sliding track 102. An auxiliary arc plate 403 is fixedly connected to the side of the sliding block 402 away from the cleaning frustum plate 401. A plastic film 404 is covered on the auxiliary arc plate 403, and one end of the plastic film 404 is fixed to the inner wall of the square plate 1. When the auxiliary arc plate 403 moves under the influence of the sliding block 402, the auxiliary arc plate 403... The plastic film 404 on the 3 will gradually separate from the auxiliary arc plate 403 and be fixed to the polyethylene pipe 2 under the action of the rubber band 405. The plastic film 404 is connected to the thin strip 406. The rubber band 405 is intermittently fixed on the outer surface of the plastic film 404. With the assistance of the rubber band 405, the plastic film 404 on the polyethylene pipe 2 will be divided into several sections of sealed film cavities. If the polyethylene pipe 2 leaks air, the gas will support the film cavity, that is, the thin strip 406 on the plastic film 404. The thin strip 406 is intermittently arranged on the plastic film 404. An air pump switch 407 is provided at one end of the annular groove 101.

[0055] The cutting assembly 5 is equipped with a height detector 501. If the slender strip 406 stands upright under the action of gas, the height detector 501 will detect it. A motion groove 502 is provided on the outer wall of the square plate 1. A U-shaped motion strip 503 slides in the motion groove 502. A driving device is provided on the outside of the U-shaped motion strip 503. A groove for the movement of the moving column 504 is provided on the U-shaped motion strip 503. The moving column 504 is driven by a motor. The moving column 504 is slidably connected to the U-shaped motion strip 503. A cutting blade 505 is rotatably connected to the bottom end of the moving column 504. The cutting blade 505 can cut the leaking local pipe.

[0056] Working principle:

[0057] In the initial state: the air port 304 on the hollow sealing column 303 is blocked by the inner wall of the polyethylene pipe 2, the gas in the polyethylene pipe 2 cannot be released from the air port 304, the spring 302 is not compressed, and the plastic film 404 is bound to the auxiliary arc plate 403 by the rubber band 405.

[0058] Sub-process:

[0059] The following is the working process of the packaging and local inspection component 4:

[0060] When in use, the device is activated, and the sliding block 402 moves in the annular groove 101 driven by the motor and assisted by the sliding track 102. It is known that one end of the plastic film 404 is fixed to the inner wall of the square plate 1. Therefore, when the auxiliary arc plate 403 moves under the drive of the sliding block 402, the plastic film 404 set on the auxiliary arc plate 403 will gradually leave the surface of the auxiliary arc plate 403 and be fixed on the polyethylene pipe 2 under the action of the rubber band 405, thereby packaging the polyethylene pipe 2. At the same time as packaging, the cleaning frustum plate 401 set on one side of the sliding block 402 will scrape off the dust and other debris attached to the polyethylene pipe 2 as it moves with the sliding block 402, ensuring the cleanliness of the polyethylene pipe 2 and preventing dust and impurities from clogging the cracks. This can easily affect the test results in subsequent testing, causing unqualified products to flow into the market, which to some extent affects the company's operation and reputation.

[0061] Furthermore, while packaging the polyethylene pipe 2, the cleaning frustum plate 401 set on one side of the sliding block 402 will scrape off the dust and other debris attached to the polyethylene pipe 2. One movement achieves two effects, which is different from manually cleaning off the dust and other debris attached to the polyethylene pipe 2 and then packaging the polyethylene pipe 2. This saves parts for the device and improves work efficiency.

[0062] Please refer to the above work process. Figures 4 to 8 , Figure 10 .

[0063] The following is the working process of the sealing indicator component 3:

[0064] When the packaging and local inspection component 4 moves from one end of the polyethylene pipe 2 to the other, it will collide with the air pump switch 407 set on the annular groove 101 during the movement. It is known that the air pump switch 407 is electrically connected to the air pump at one end of the polyethylene pipe 2. Therefore, the air pump connected to one end of the polyethylene pipe 2 will pump air into the polyethylene pipe 2. If the polyethylene pipe 2 is well sealed, the gas pressure in the polyethylene pipe 2 will gradually increase and eventually push out the hollow sealing column 303 set in the polyethylene pipe 2, causing the gas to leak out of the pipe from the air port 304. At this time, the buzzer whistle set on the air port 304 will sound when the gas is leaking out. The sound is emitted under the action of the body. After the buzzer detector 305 detects the sound, it will control the indicator light 306, which is electrically connected to it, to turn green. With the dual feedback of the buzzer sound and the green indicator light 306, it can be proved that the polyethylene pipe 2 is qualified. The inspector can then pack it into the warehouse. If the polyethylene pipe 2 has cracks or holes, the hollow sealing column 303 will not be pushed out by the gas, and the buzzer whistle on the gas port 304 will not make a sound. If the buzzer detector 305 does not detect a sound for a certain period of time, the indicator light 306 will turn red to remind the inspector that the sealing of the polyethylene pipe 2 is unqualified.

[0065] Furthermore, before the air pump switch 407 controls the air pump to pump air to the polyethylene tube 2, the plastic film 404 has been fixed to the outer surface of the polyethylene tube 2 by the rubber band 405 under the action of the packaging and local detection component 4. That is, with the assistance of the rubber band 405, the plastic film 404 on the polyethylene tube 2 will be divided into several sealed film cavities. When the polyethylene tube 2 leaks air, the gas will gradually support the thin strip 406 on the film cavity, that is, on the plastic film 404. The thin strip 406 will gradually rise under the action of the gas and eventually be in a vertical state, thus telling the inspector that this section of the polyethylene tube 2 is unqualified. That is, through this setting, the air leakage phenomenon that is not easy to be observed by the human eye can be transformed into a visual and easy-to-observe specific action, that is, the thin strip 406 changes from a deflated state to a vertical state after being inflated.

[0066] Please refer to the above work process. Figures 1 to 3 .

[0067] The following is the working process of cutting component 5:

[0068] When in use, when the slender strip 406 changes from a deflated state to an inflated vertical state, the height detector 501 in the cutting assembly 5 will detect the protruding slender strip 406 to determine the location of the air leak. Then, under the control system of the cutting assembly 5, the U-shaped moving strip 503 will move in the moving groove 502 and thereby cause the cutting blade 505 set on the moving column 504 to cut off the leaking section.

[0069] Please refer to the above work process. Figure 2 , Figure 9 .

[0070] Furthermore, through the design of the overall device, the three processes of cleaning, testing, and packaging can be transformed into one process. The polyethylene tube 2, which is covered with dust and debris, will not be directly packaged after testing, thus avoiding a significant reduction in product quality. Since cleaning, testing, and packaging are no longer carried out separately, there will be no issues such as long processing times or large transfer areas, ensuring the final product quality to the greatest extent and achieving relatively high efficiency.

[0071] Overall process:

[0072] The packaging and local inspection component 4 in the device can scrape off dust and debris attached to the polyethylene pipe 2 and package the polyethylene pipe 2 accordingly during operation. In addition, with the combined action of the sealing indicator component 3 and the packaging and local inspection component 4, unqualified polyethylene pipe 2 can be detected, down to a specific section. Then, the unqualified section can be cut off by the cutting component 5.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0074] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing device for polyethylene pipes, characterized in that: Includes a square plate (1), on which an annular groove (101) is provided, and a sliding track (102) is provided in the annular groove (101). A polyethylene pipe (2) is provided in the inner groove of the annular groove (101). A sealing indicator component (3) is provided at one end of the polyethylene pipe (2). A packaging and local detection component (4) is provided on the outer surface of the polyethylene pipe (2). A cutting component (5) is provided above the polyethylene pipe (2). The sealing indicator assembly (3) is provided with a support plate (301), and a spring (302) is provided inside the support plate (301). A hollow sealing column (303) is fixedly connected to one end of the spring (302) away from the support plate (301). An air port (304) is opened on the hollow sealing column (303). A buzzer detector (305) is provided on one side of the support plate (301) in the annular groove (101). An indicator light (306) is provided on one side of the buzzer detector (305). The packaging and local detection assembly (4) is provided with a cleaning frustum plate (401). A sliding block (402) is fixedly connected to one side of the cleaning frustum plate (401). An auxiliary arc plate (403) is fixedly connected to the side of the sliding block (402) away from the cleaning frustum plate (401). A plastic film (404) is covered on the auxiliary arc plate (403). A rubber band (405) is intermittently fixed to the outer surface of the plastic film (404). A thin strip (406) is intermittently arranged on the plastic film (404). An air pump switch (407) is provided at one end of the annular groove (101). A buzzer is provided on the air port (304). Gas is injected into the polyethylene pipe (2) by the air pump, and when the air tightness is good, the sealing column (303) is pushed out, so that the gas is discharged from the air port (304). The buzzer emits a sound and is detected by the buzzer detector (305) to judge the overall air tightness of the polyethylene pipe (2). The sliding block moves on the sliding track (102) to drive the cleaning round plate (401) to clean the pipe surface. Combined with the plastic film (404) to achieve the function of packaging, the rubber band (405) and the thin strip (406) work together to achieve the detection of local air leakage in the pipe, and the cleaning, detection and packaging processes are transformed into one process.

2. The detection device for polyethylene pipes according to claim 1, characterized in that: The cutting assembly (5) is equipped with a height detector (501), and a motion groove (502) is provided on the outer wall of the square plate (1). A U-shaped motion strip (503) slides in the motion groove (502), and a moving column (504) is slidably connected on the U-shaped motion strip (503). A cutting blade (505) is rotatably connected to the bottom end of the moving column (504).

3. The detection device for polyethylene pipes according to claim 1, characterized in that: The buzzer detector (305) and indicator light (306) are electrically connected.

4. The detection device for polyethylene pipes according to claim 1, characterized in that: The plastic film (404) is connected to the elongated strip (406).

5. The detection device for polyethylene pipes according to claim 2, characterized in that: The U-shaped moving bar (503) has a groove for the movement of the moving column (504), which is driven by a motor.

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