Rapid detection equipment for cushion material gradation in dam rolling process

Abstract

The invention relates to the technical field of dam rolling, and discloses cushion material gradation rapid detection equipment used in the dam rolling process, the cushion material gradation rapid detection equipment comprises a stone box, the top of the stone box is provided with a top translation frame, the bottom of the top translation frame is fixedly connected with a detection control box, and one side of the detection control box is fixedly connected with a calculation module; the top translation frame horizontally moves to drive the scanning imaging equipment to scan, a particle size distribution diagram is generated according to the particle size of the surface stone in the stone box, the particle size diagram can display the blasting particle size, blasting parameters are adjusted according to the particle size detected by the particle size distribution diagram, and the particle size is larger than the row distance between reduced blasting holes required by design. The grain size is smaller than the design requirement for increasing the row distance between blast holes, and the gradation requirement of filling materials is conveniently controlled; the middle screening net is scanned through the scanning imaging device, the middle inner screening frame is pushed out after the screening net is suitable, the surface of the bottommost inner screening frame is scanned, and the screening effect is improved through step-by-step scanning.

Description

Technical Field

[0001] The invention relates to the technical field of dam rolling, in particular to a device for quickly detecting the gradation of cushion materials during the dam rolling process. Background Art

[0002] The cushion material is a specific material used in dam filling. The cushion material needs to have good physical properties, such as hardness, good durability, and no impurities such as clay and organic matter. These properties are crucial to ensure the stability and durability of the cushion material. It is usually a granular material with specific gradation and physical properties obtained by mining and processing in the material field. It is mainly used near the downstream slope of the dam to prevent the loss of coarse and fine particles in the dam, while protecting the dam body and providing stable support. Through reasonable gradation design, the cushion material can optimize the drainage performance of the dam and reduce the water accumulation and water pressure in the dam body. During the filling process of the cushion material, strict quality control is required, such as testing the gradation, dry density and other indicators of the cushion material to ensure that it meets the design requirements.

[0003] However, in dam construction, the gradation of cushion materials is crucial to the stability and durability of the dam. Traditional detection methods are time-consuming and difficult to provide timely feedback on the gradation of cushion materials, resulting in low construction efficiency and difficulty in accurately adjusting blasting parameters to meet the cushion material requirements under different geological conditions. Therefore, it is particularly important to develop a system and method that can quickly and accurately detect the gradation of cushion materials and intelligently adjust blasting parameters based on the test results. The stone particle size needs to be manually screened repeatedly, and the cumbersome screening process takes a lot of time. Especially when dealing with a large amount of stone, low screening efficiency will directly lead to an extension of the production cycle and require more human resources. This not only increases labor costs, but may also lead to a further decline in production efficiency due to insufficient manpower. In addition, stones screened manually often result in uneven particle size distribution, which will affect subsequent processing and use effects. Summary of the invention

[0004] The purpose of the present invention is to provide a rapid detection device for the gradation of cushion materials during the dam compaction process, which solves the problem in the background technology that the stone particle size needs to be repeatedly screened manually. The cumbersome screening process takes a lot of time, especially when processing a large amount of stone. The low screening efficiency will directly lead to an extension of the production cycle, and more human resources need to be invested, which not only increases the labor cost, but may also lead to a further decline in production efficiency due to insufficient manpower. In addition, the stones screened manually often lead to uneven particle size distribution, which will affect the subsequent processing and use effect.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A rapid detection device for cushion material gradation during dam compaction comprises a stone box, a top translation frame is arranged on the top of the stone box, a detection control box is fixedly connected to the bottom of the top translation frame, a computing module is fixedly connected to one side of the detection control box, a scanning imaging device is fixedly connected to the bottom of the detection control box, and a transmission cable is movably connected to one side of the scanning imaging device.

[0007] Preferably, one side of the stone box is fixedly connected to a bottom support frame, the top of the bottom support frame is fixedly connected to a top servo motor, the output shaft of the top servo motor is fixedly connected to a transmission threaded rod, the surface of the transmission threaded rod is threadedly connected to a threaded ring, and the top of the threaded ring is fixedly connected to a side transmission frame.

[0008] Preferably, one end of the transmission threaded rod is movably connected to a bearing disk, and one side of the bearing disk is movably connected to a side limit plate.

[0009] Preferably, a top sliding rail is provided on the top of the stone box, a top sliding plate is slidably connected to the top of the top sliding rail, and a top of the top sliding plate is fixedly connected to the bottom of the top translation frame.

[0010] Preferably, a side sliding rail is provided on the inner side of the stone box, a side sliding plate is slidably connected to the inner side of the side sliding rail, an inner screening frame is fixedly connected to one side of the side sliding plate, a grip rod is fixedly connected to one side of the inner screening frame, and a screening net is fixedly connected to the inner side of the inner screening frame.

[0011] Preferably, one side of the top translation frame is fixedly connected to a top support frame, one side of the top support frame is fixedly connected to a top fixing plate, the top of the top fixing plate is fixedly connected to an L bracket, the top of the L bracket is fixedly connected to an electric push rod, and the output end of the electric push rod is fixedly connected to a bottom movable plate.

[0012] Preferably, a bottom transmission motor is fixedly connected to the surface of the bottom movable plate, an output shaft of the bottom transmission motor is fixedly connected to a bottom transmission disk, and a stirring rod is fixedly connected to the bottom of the bottom transmission disk.

[0013] Preferably, a top communicating groove is opened on the surface of the top fixing plate, the number of the top communicating grooves is two, and the two top communicating grooves are symmetrically arranged along the surface of the top fixing plate.

[0014] Preferably, a bottom connecting groove is provided on the surface of the bottom movable plate, and the top of the bottom connecting groove is fixedly connected to two sides of the bottom transmission motor.

[0015] Preferably, the top fixed plate and the bottom movable plate are both arranged in parallel along one side of the stone box.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] 1. After supporting the top servo motor on one side of the stone box through the bottom support frame, start the top servo motor, drive the transmission threaded rod to rotate through the top servo motor, and stably support the rotating transmission threaded rod on one side of the side limit plate through the movable connection of the bearing disc to keep the transmission threaded rod rotating stably. Through the threaded connection between the transmission threaded rod and the threaded ring, the side transmission frame will be driven to move horizontally when the transmission threaded rod rotates. Through the connection of the side transmission frame, the top sliding plate will be driven to move horizontally during the horizontal movement of the side transmission frame, and the horizontal movement of the top sliding plate will move along The surface of the top sliding rail slides, and drives the top translation frame to adjust the horizontal position along the top of the stone box. The top translation frame moves horizontally, driving the scanning imaging device to scan. The scanned image will be transmitted to the detection control box through the transmission cable, and calculated through the transmission cable to generate a particle size distribution diagram of the surface stone particle size in the stone box. The particle size diagram can display the blasting particle size. The blasting parameters are adjusted according to the particle size detected by the particle size distribution diagram. If the particle size is larger than the design requirement, the spacing between blasting holes is reduced, and if the particle size is smaller than the design requirement, the spacing between blasting holes is increased, so as to control the grading requirements of the filling materials.

[0018] 2. The horizontal movement of the top translation frame will synchronously drive the top support frame to move, and through the connection of the top support frame, it will synchronously drive the top fixed plate to move horizontally. At this time, through the connection of the L bracket, the electric push rod is fixed to the top of the top fixed plate. By starting the electric push rod, the output end of the electric push rod passes through the inner side of the top connecting groove to push the bottom movable plate to move vertically. After lowering the bottom movable plate, the bottom transmission motor is started at this time. After passing through the bottom connecting groove, the bottom transmission disc is driven to rotate. The rotating bottom transmission disc will drive multiple stirring rods to stir along the inner side of the stone box, which can mix the blasted stones and make the stones with smaller diameters seep downward, reducing the workload of subsequent screening and improving practicality.

[0019] 3. There are three inner screening frames, and screening nets are arranged on the inner sides of the three inner screening frames, and the gaps of the three screening nets are arranged from large to small from top to bottom. After the stone is initially stirred by the stirring rod, the smaller stone will be gradually screened downward along the top inner screening frame. At this time, the top stone will be scanned by the scanning imaging device until the stone accumulated on the surface of the top inner screening frame is screened to a suitable diameter. The operator holds the grip and pulls the grip to drive the inner screening frame to move. The horizontal movement of the inner screening frame will drive the side sliding plate to slide along the inner side of the side sliding rail. After the top inner screening frame is pushed out, the scanning imaging device is used to scan the screening net in the middle. After it is suitable, the inner screening frame in the middle is pushed out, and the surface of the inner screening frame at the bottom is scanned. The screening effect is improved by gradual scanning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the stone box structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the side sliding plate of the present invention;

[0023] Figure 4 It is a schematic diagram of the bottom support frame structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the side transmission frame of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the top translation frame of the present invention;

[0026] Figure 7 It is a schematic diagram of the bottom connecting groove structure of the present invention.

[0027] Wherein: 1. stone box; 201. side sliding rail; 202. inner screening frame; 203. side sliding plate; 204. screening net; 205. gripping rod; 301. bottom support frame; 302. top servo motor; 303. transmission threaded rod; 304. bearing plate; 305. side limit plate; 306. side transmission frame; 307. threaded ring; 308. top sliding plate; 309. top sliding rail; 401. top translation frame; 402. detection control box; 403. computing module; 404. scanning imaging device; 405. transmission cable; 501. top support frame; 502. top fixed plate; 503. top connecting groove; 504. L bracket; 505. electric push rod; 506. bottom movable plate; 507. bottom transmission motor; 508. bottom transmission plate; 509. stirring rod; 5010. bottom connecting groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-7A rapid detection device for cushion material gradation during dam rolling process, comprising a stone box 1, a top translation frame 401 is arranged on the top of the stone box 1, a detection control box 402 is fixedly connected to the bottom of the top translation frame 401, a computing module 403 is fixedly connected to one side of the detection control box 402, a scanning imaging device 404 is fixedly connected to the bottom of the detection control box 402, and a transmission cable 405 is movably connected to one side of the scanning imaging device 404.

[0030] It should be noted that the scanned image will be transmitted to the detection control box 402 via the transmission cable 405, and calculated through the transmission cable 405 to generate a particle size distribution diagram for the particle size of the surface stone in the stone box 1. The particle size diagram can display the blasting particle size. The blasting parameters are adjusted according to the particle size detected by the particle size distribution diagram. If the particle size is larger than the design requirement, the spacing between blasting holes will be reduced, and if the particle size is smaller than the design requirement, the spacing between blasting holes will be increased, so as to facilitate the control of the grading requirements of the filling material.

[0031] In an optional embodiment: one side of the stone box 1 is fixedly connected to a bottom support frame 301, the top of the bottom support frame 301 is fixedly connected to a top servo motor 302, the output shaft of the top servo motor 302 is fixedly connected to a transmission threaded rod 303, the surface of the transmission threaded rod 303 is threadedly connected to a threaded ring 307, and the top of the threaded ring 307 is fixedly connected to a side transmission frame 306.

[0032] It should be noted that, through the threaded connection between the transmission threaded rod 303 and the threaded ring 307, when the transmission threaded rod 303 rotates, it will synchronously drive the side transmission frame 306 to move horizontally. Through the connection of the side transmission frame 306, during the horizontal movement of the side transmission frame 306, the top sliding plate 308 will be driven to move horizontally. The horizontal movement of the top sliding plate 308 will slide along the surface of the top sliding rail 309, and drive the top translation frame 401 to adjust the horizontal position along the top of the stone box 1.

[0033] In an optional embodiment: one end of the transmission threaded rod 303 is movably connected to a bearing disk 304 , and one side of the bearing disk 304 is movably connected to a side limiting plate 305 .

[0034] It should be noted that, through the movable connection of the bearing plate 304 , the rotating transmission threaded rod 303 is stably and movably supported on one side of the side limit plate 305 , so that the transmission threaded rod 303 can be kept to rotate stably.

[0035] In an optional embodiment: a top sliding rail 309 is opened on the top of the stone box 1, and the top of the top sliding rail 309 is slidably connected to a top sliding plate 308, and the top of the top sliding plate 308 is fixedly connected to the bottom of the top translation frame 401.

[0036] It should be noted that, through the connection of the side transmission frame 306, the top sliding plate 308 will be driven to move horizontally during the horizontal movement of the side transmission frame 306. The horizontal movement of the top sliding plate 308 will slide along the surface of the top sliding rail 309, and drive the top translation frame 401 to adjust the horizontal position along the top of the stone box 1. Through the horizontal movement of the top translation frame 401, the scanning imaging device 404 is driven to scan.

[0037] In an optional embodiment: a side sliding rail 201 is opened on the inner side of the stone box 1, the inner side of the side sliding rail 201 is slidably connected to a side sliding plate 203, one side of the side sliding plate 203 is fixedly connected to an inner screening frame 202, one side of the inner screening frame 202 is fixedly connected to a grip rod 205, and the inner side of the inner screening frame 202 is fixedly connected to a screening net 204.

[0038] It should be noted that there are three inner screening frames 202, and the inner sides of the three inner screening frames 202 are all provided with screening nets 204, and the gaps of the three screening nets 204 are successively arranged from large to small from top to bottom. After the stones are initially stirred by the stirring rod 509, the smaller stones will be gradually screened downward along the topmost inner screening frame 202.

[0039] In an optional embodiment: one side of the top translation frame 401 is fixedly connected to the top support frame 501, one side of the top support frame 501 is fixedly connected to the top fixing plate 502, the top of the top fixing plate 502 is fixedly connected to the L bracket 504, the top of the L bracket 504 is fixedly connected to the electric push rod 505, and the output end of the electric push rod 505 is fixedly connected to the bottom movable plate 506.

[0040] It should be noted that the horizontal movement of the top translation frame 401 will synchronously drive the top support frame 501 to move, and through the connection of the top support frame 501, it will synchronously drive the top fixed plate 502 to move horizontally. At this time, through the connection of the L bracket 504, the electric push rod 505 is fixed to the top of the top fixed plate 502. By starting the electric push rod 505, the output end of the electric push rod 505 passes through the inner side of the top connecting groove 503 to push the bottom movable plate 506 to move vertically.

[0041] In an optional embodiment: a bottom transmission motor 507 is fixedly connected to the surface of the bottom movable plate 506 , an output shaft of the bottom transmission motor 507 is fixedly connected to a bottom transmission disc 508 , and a stirring rod 509 is fixedly connected to the bottom of the bottom transmission disc 508 .

[0042] It should be noted that after the bottom movable plate 506 is lowered, the bottom transmission motor 507 is started, and the bottom transmission motors 507 penetrate the bottom connecting groove 5010 and drive the bottom transmission disc 508 to rotate. The rotating bottom transmission disc 508 will drive the multiple stirring rods 509 to stir along the inner side of the stone box 1, so as to mix the blasted stones and make the stones with smaller diameters seep downward, thereby reducing the workload of subsequent screening and improving practicality.

[0043] In an optional embodiment: a top communicating groove 503 is opened on the surface of the top fixing plate 502 , the number of the top communicating grooves 503 is two, and the two top communicating grooves 503 are symmetrically arranged along the surface of the top fixing plate 502 .

[0044] It should be noted that, by starting the electric push rod 505, the output end of the electric push rod 505 passes through the inner side of the top connecting groove 503 to push the bottom movable plate 506 to move vertically.

[0045] In an optional embodiment: a bottom connecting groove 5010 is opened on the surface of the bottom movable plate 506 , and the top of the bottom connecting groove 5010 is fixedly connected to two sides of the bottom transmission motor 507 .

[0046] It should be noted that, after starting the bottom transmission motor 507 , multiple bottom transmission motors 507 penetrate the bottom connecting groove 5010 and drive the bottom transmission disc 508 to rotate, and the rotating bottom transmission disc 508 will drive multiple stirring rods 509 to stir along the inner side of the stone box 1 .

[0047] In an optional embodiment, the top fixed plate 502 and the bottom movable plate 506 are both arranged in parallel along one side of the stone box 1 .

[0048] It should be noted that, through the connection of the top support frame 501, the top fixed plate 502 will be synchronously driven to move horizontally. At this time, through the connection of the L bracket 504, the electric push rod 505 is fixed to the top of the top fixed plate 502. By starting the electric push rod 505, the output end of the electric push rod 505 passes through the inner side of the top connecting groove 503 to push the bottom movable plate 506 to move vertically.

[0049] The specific working steps of a rapid detection device for cushion material gradation during dam compaction are as follows:

[0050] After the top servo motor 302 is supported on one side of the stone box 1 by the bottom support frame 301, the top servo motor 302 is started, and the transmission threaded rod 303 is driven to rotate by the top servo motor 302, and the rotating transmission threaded rod 303 is stably supported on one side of the side limit plate 305 through the movable connection of the bearing plate 304, so that the transmission threaded rod 303 can be kept to rotate stably, and the transmission threaded rod 303 is threadedly connected with the threaded ring 307, so that when the transmission threaded rod 303 rotates, it will synchronously drive the side transmission frame 306 to move horizontally, and the side transmission The top sliding plate 308 is driven to move horizontally during the horizontal movement of the side transmission frame 306. The horizontal movement of the top sliding plate 308 slides along the surface of the top sliding rail 309 and drives the top translation frame 401 to adjust the horizontal position along the top of the stone box 1. The horizontal movement of the top translation frame 401 drives the scanning imaging device 404 to scan. The scanned image is transmitted to the detection control box 402 through the transmission cable 405, and the transmission cable 405 is used for calculation to generate a particle size distribution of the surface stone particle size in the stone box 1. The particle size map can display the blasting particle size. The blasting parameters are adjusted according to the particle size detected by the particle size distribution map. The spacing between blasting holes is reduced when the particle size is larger than the design requirement, and the spacing between blasting holes is increased when the particle size is smaller than the design requirement, so as to control the grading requirements of the filling material. Before scanning, the horizontal movement of the top translation frame 401 will synchronously drive the top support frame 501 to move, and through the connection of the top support frame 501, it will synchronously drive the top fixed plate 502 to move horizontally. At this time, the electric push rod 505 is fixed to the top of the top fixed plate 502 through the connection of the L bracket 504. Start the electric push rod 505, and pass the output end of the electric push rod 505 through the inner side of the top connecting groove 503 to push the bottom movable plate 506 to move vertically. After the bottom movable plate 506 is lowered, the bottom transmission motor 507 is started at this time. After the bottom connecting groove 5010 is penetrated by multiple bottom transmission motors 507, the bottom transmission disc 508 is driven to rotate. The rotating bottom transmission disc 508 will drive multiple stirring rods 509 to stir along the inner side of the stone box 1, so that the blasted stones can be mixed and the stones with smaller diameters can be infiltrated downward, thereby reducing the workload of subsequent screening and improving practicality.There are three inner screening frames 202, and the inner sides of the three inner screening frames 202 are all provided with screening nets 204, and the gaps of the three screening nets 204 are arranged from large to small from top to bottom. After the stones are initially stirred by the stirring rod 509, the smaller stones will be gradually screened downward along the top inner screening frame 202. At this time, after the top stones are scanned by the scanning imaging device 404, until the stones accumulated on the surface of the top inner screening frame 202 are screened to a suitable diameter, the operator holds the gripping rod 205 and pulls the gripping rod 205 to drive the inner screening frame 202 to move. The horizontal movement of the inner screening frame 202 will drive the side sliding plate 203 to slide along the inner side of the side sliding rail 201, and the top After the inner screening frame 202 is pushed out, the scanning imaging device 404 is used to scan the middle screening net 204. After it is suitable, the inner screening frame 202 in the middle is pushed out, and the surface of the inner screening frame 202 at the bottom is scanned. The screening effect is improved by scanning step by step. The step-by-step scanning device is used for operation. According to the scanning results, if the particle gradation of the cushion material at a certain level does not meet the design requirements, the step-by-step scanning is used to quickly locate and take corresponding measures for rectification. The construction personnel can adjust the rolling parameters, such as the rolling speed, the number of rolling passes, etc., to optimize the compaction effect and gradation quality of the cushion material, reduce the workload of the operators, reduce the operation time, improve the detection efficiency, and improve the overall stability and durability of the dam. ;

[0051] It should be noted that the parts not described in detail in the present invention are all prior art, and corresponding models can be selected according to actual needs. The internal structure and operating principle of the above parts are also common knowledge of those skilled in the art, and no further elaboration will be given on this.

[0052] Although the 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 alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for quickly detecting the gradation of cushion materials during dam compaction, comprising a stone box (1), characterized in that: A top translation frame (401) is arranged on the top of the stone box (1), a detection control box (402) is fixedly connected to the bottom of the top translation frame (401), a computing module (403) is fixedly connected to one side of the detection control box (402), a scanning imaging device (404) is fixedly connected to the bottom of the detection control box (402), and a transmission cable (405) is movably connected to one side of the scanning imaging device (404).

2. The rapid detection device for cushion material gradation during dam compaction according to claim 1 is characterized by: A bottom support frame (301) is fixedly connected to one side of the stone box (1), a top servo motor (302) is fixedly connected to the top of the bottom support frame (301), an output shaft of the top servo motor (302) is fixedly connected to a transmission threaded rod (303), a threaded ring (307) is threadedly connected to the surface of the transmission threaded rod (303), and a side transmission frame (306) is fixedly connected to the top of the threaded ring (307).

3. The rapid detection device for cushion material gradation during dam compaction according to claim 2 is characterized by: One end of the transmission threaded rod (303) is movably connected to a bearing plate (304), and one side of the bearing plate (304) is movably connected to a side limiting plate (305).

4. The rapid detection device for cushion material gradation during dam compaction according to claim 3 is characterized by: A top sliding rail (309) is provided on the top of the stone box (1), and a top sliding plate (308) is slidably connected to the top of the top sliding rail (309), and the top of the top sliding plate (308) is fixedly connected to the bottom of the top translation frame (401).

5. The rapid detection device for cushion material gradation during dam compaction according to claim 4 is characterized by: A side sliding rail (201) is provided on the inner side of the stone box (1), a side sliding plate (203) is slidably connected to the inner side of the side sliding rail (201), an inner screening frame (202) is fixedly connected to one side of the side sliding plate (203), a gripping rod (205) is fixedly connected to one side of the inner screening frame (202), and a screening net (204) is fixedly connected to the inner side of the inner screening frame (202).

6. The device for rapid detection of cushion material gradation during dam compaction according to claim 5, characterized in that: One side of the top translation frame (401) is fixedly connected to a top support frame (501), one side of the top support frame (501) is fixedly connected to a top fixing plate (502), the top of the top fixing plate (502) is fixedly connected to an L bracket (504), the top of the L bracket (504) is fixedly connected to an electric push rod (505), and the output end of the electric push rod (505) is fixedly connected to a bottom movable plate (506).

7. The rapid detection device for cushion material gradation during dam compaction according to claim 6 is characterized by: A bottom transmission motor (507) is fixedly connected to the surface of the bottom movable plate (506), an output shaft of the bottom transmission motor (507) is fixedly connected to a bottom transmission disc (508), and a stirring rod (509) is fixedly connected to the bottom of the bottom transmission disc (508).

8. The device for rapid detection of cushion material gradation during dam compaction according to claim 7, characterized in that: The surface of the top fixing plate (502) is provided with a top communicating groove (503), the number of the top communicating grooves (503) is two, and the two top communicating grooves (503) are symmetrically arranged along the surface of the top fixing plate (502).

9. The device for rapid detection of cushion material gradation during dam compaction according to claim 8, characterized in that: A bottom connecting groove (5010) is provided on the surface of the bottom movable plate (506), and the top of the bottom connecting groove (5010) is fixedly connected to two sides of the bottom transmission motor (507).

10. The device for rapid detection of cushion material gradation during dam compaction according to claim 9, characterized in that: The top fixed plate (502) and the bottom movable plate (506) are both arranged in parallel along one side of the stone box (1).

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