Rice polishing machine

Abstract

The utility model relates to the technical field of grain processing equipment, and discloses a rice polishing machine which comprises an outer box, the top of the outer box is fixedly connected with a top shell, the right side of the top of the top shell is communicated with a feeding hopper, the middle of the inner wall of the feeding hopper is fixedly connected with a limiting plate, and inclined face grooves are formed in the periphery of the inner wall of the limiting plate. And the front side and the rear side of the feeding hopper communicate with a plurality of hollow columns, the tops of the multiple hollow columns are slidably connected with telescopic columns, the top ends of the multiple telescopic columns penetrate through the bottom of the limiting plate and are fixedly connected with a quantitative plate, and quantitative grooves are formed in the left side and the right side of the quantitative plate. According to the rice polishing device, the quantitative groove and the bevel groove are attached to each other, appropriate gas is injected into the hollow column by starting the air pump, the telescopic column upwards drives the quantitative plate to lift, the opening and closing degree between the quantitative groove and the bevel groove is used for controlling the feeding amount of rice, the feeding speed of the rice is accurately controlled, and different polishing requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of grain processing equipment technology, and in particular to a rice polishing machine. Background Technology

[0002] Currently, the commonly used rice processing technology is as follows: first, vibration cleaning is used to remove impurities and foreign objects; then, grading and stone removal are carried out to remove sand, stones and metal objects from the rice; then, dehulling, coarse-crushing separation and selection are carried out to dehull the rice and remove the bran to form brown rice; then, a rice milling machine is used to grind and whiten the brown rice, allowing the bran to be separated under the cutting and grinding of the rice rollers; then, whitening is carried out to remove the remaining bran and bran powder, improving the smoothness and color of the rice grain surface.

[0003] A search revealed Chinese Patent Publication No. CN204602247U, which discloses a rice polishing machine, belonging to the technical field of grain processing equipment. This utility model includes a control device, a feeding hopper, a transmission device, a fan, a polishing chamber, a discharge port, a bran collection hopper, and a frame. The polishing chamber and feeding hopper are fixed above the frame, the fan is on one side of the frame, the discharge port is on the other side, the bran collection hopper is below the frame, and the control device is fixed at the rear of the frame. The outer shell of the polishing chamber is formed by two semi-circular rollers fastened together. A polishing roller is installed inside the polishing chamber, and the polishing roller has air nozzles along its length, which are connected to the fan outlet. A spray device is installed above the feeding hopper, and an electrically controlled valve is installed below the feeding hopper, connected to the control device. This utility model can control the atomization time of the rice, ensuring uniform atomization and improving the polishing quality of the rice. However, in actual use, the above-mentioned device has the problem that it is difficult to control the feeding speed after the material is placed manually through the feeding hopper, which makes it difficult for the polishing machine to accurately process the material. Therefore, a rice polishing machine is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a rice polishing machine, which aims to improve the problem of difficulty in controlling the feeding speed when materials are placed manually in the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a rice polishing machine, comprising an outer casing, a top shell fixedly connected to the top of the outer casing, a feeding hopper connected to the top right side of the top shell, a limiting plate fixedly connected to the middle of the inner wall of the feeding hopper, inclined grooves formed around the inner wall of the limiting plate, multiple hollow columns connected to the front and rear sides of the feeding hopper, telescopic columns slidably connected to the tops of the multiple hollow columns, a metering plate fixedly connected to the top of each of the multiple telescopic columns penetrating the bottom of the limiting plate, metering grooves formed on the left and right sides of the metering plate, an air pump fixedly connected to the right side of the top shell, an air collecting pipe connected to one end of the air pump, the bottom ends of the multiple hollow columns connected to the top of the outer wall of the air collecting pipe, a pressure detector installed on the left side of the outer wall of the air collecting pipe, and a filter mechanism provided inside the outer casing.

[0006] The above technical solution involves sealing the hollow column and the telescopic column. By starting the air pump, gas is injected into or extracted from the central pipe, thereby controlling the air pressure to achieve the telescopic column's extension and retraction. The metering plate is located on top of the limiting plate, and the inclined groove and the metering groove are in contact with each other. The inclined groove allows the material at the top to slide into the polishing equipment more effectively. The opening and closing size between the metering groove and the inclined groove controls the feeding speed, and the internal air pressure is monitored in real time by a pressure detector on the outer wall of the air collecting pipe.

[0007] As a further description of the above technical solution:

[0008] The filtration mechanism includes an exhaust cover plate, the bottom of which is fixedly connected to the top of the top shell. An air inlet is provided on the front side of the outer casing. A servo motor is fixedly connected to the left side of the outer casing. The output end of the servo motor passes through the left side of the outer casing and is fixedly connected to a first rotating roller. A second rotating roller is rotatably connected to the lower middle part of the inner wall of the outer casing. The first rotating roller and the second rotating roller are connected by a filter belt. A third rotating roller is rotatably connected to the lower middle part of the inner wall of the outer casing. The third rotating roller and the second rotating roller are connected by a connecting belt. A cleaning roller is fixedly connected to the outer wall of the third rotating roller.

[0009] Through the above technical solution: the internal operating equipment of the polishing machine needs to draw in external air for heat dissipation through a built-in fan. When air enters the outer casing through the air inlet, the dust attached to the air will be filtered by the filter belt to prevent dust from affecting the internal operating components and polishing efficiency. When the filter belt needs to be cleaned, the servo motor is started to drive the first rotating roller to rotate. The first and second rotating rollers are connected by the filter belt, so the filter belt moves downward synchronously. At the same time, the third rotating roller rotates synchronously under the action of the connecting belt. The cleaning roller on the outer wall moves in the opposite direction to the filter belt, thereby scraping off the dust on the outer wall of the filter belt, improving cleaning efficiency and heat dissipation efficiency.

[0010] As a further description of the above technical solution:

[0011] The filtration mechanism also includes a collection box, the outer wall of which is slidably connected to the bottom of the inner wall of the outer casing.

[0012] With the above technical solution, the scraped dust will fall into the collection box. The collection box is separated from the components inside the outer box. In addition to the dust being removed, which can fall precisely into the collection box, other dust cannot enter the inside of the outer box.

[0013] As a further description of the above technical solution:

[0014] The top shell has a discharge port on its left side, and the outer box has a slide rail fixedly connected to its left side.

[0015] The above technical solution involves polishing the material using a polishing device inside the top shell, then discharging the material through the outlet and guiding it precisely into the storage container via a slide.

[0016] As a further description of the above technical solution:

[0017] The front side of the outer casing is rotatably connected to a hinge, and the outer wall of the hinge is rotatably connected to a casing door.

[0018] The above technical solution connects the outer casing and the door via hinges, facilitating the rotation and closure of the door and simplifying future maintenance and inspection.

[0019] As a further description of the above technical solution:

[0020] Support columns are fixedly connected to the four corners of the bottom of the outer casing, and rubber pads are fixedly connected to the bottom of the support columns.

[0021] The above technical solution involves supporting the entire device with support columns, which provides stability while the rubber pads at the bottom enhance shock absorption and prevent friction with the ground.

[0022] As a further description of the above technical solution:

[0023] A controller is fixedly connected to the right side of the outer casing, and multiple connecting plates are fixedly connected to the front and rear sides of the top shell. Shock-absorbing plates are fixedly connected to the bottom of the multiple connecting plates.

[0024] The above technical solution allows for convenient and simple operation and control of the equipment on the entire device via a controller.

[0025] As a further description of the above technical solution:

[0026] Each of the connecting plates has a screw hole on its top, and each of the screw holes has a bolt threaded into its interior.

[0027] The above technical solution involves fixing the connecting plate to the top of the outer casing with bolts, which improves the firmness between the outer casing and the top shell.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, the material is fed through a feeding hopper. The metering trough and the inclined trough fit together to form the feeding channel for rice. By starting the air pump, appropriate gas is injected into the hollow column. The pressure detector monitors the air pressure inside the gas collecting pipe in real time, causing the telescopic column to lift the metering plate. The opening and closing size between the metering trough and the inclined trough is used to control the amount of rice fed and to precisely control the feeding speed of the rice to meet different polishing requirements.

[0030] 2. In this utility model, external air is introduced into the outer casing through the air inlet, and the built-in fan delivers the gas to the surface of the equipment to achieve a heat dissipation effect. When too much dust adheres to the surface of the filter belt, the servo motor is activated to drive the filter belt to move downward. At the same time, the connecting belt drives the rotating roller to rotate, which in turn drives the cleaning roller to scrape off the dust on the surface of the filter belt. The scraped dust is collected and processed through the collection box at the bottom, which not only facilitates the dust cleaning work, but also improves the overall heat dissipation efficiency. Attached Figure Description

[0031] Figure 1 This is a perspective view of a rice polishing machine proposed in this utility model;

[0032] Figure 2 This is a front view of a rice polishing machine proposed in this utility model;

[0033] Figure 3 An exploded view of a rice polishing machine proposed in this utility model;

[0034] Figure 4 This is a split view of the metering plate of a rice polishing machine proposed in this utility model;

[0035] Figure 5 This is an exploded view of the filtration mechanism of a rice polishing machine proposed in this utility model.

[0036] Legend:

[0037] 1. Outer casing; 2. Filtering mechanism; 201. Air inlet; 202. Servo motor; 203. Rotary roller one; 204. Rotary roller two; 205. Filter belt; 206. Rotary roller three; 207. Cleaning roller; 208. Connecting belt; 209. Collection box; 210. Exhaust cover; 3. Top shell; 4. Feed hopper; 5. Limiting plate; 6. Inclined groove; 7. Hollow column; 8. Telescopic column; 9. Metering plate; 10. Metering groove; 11. Air pump; 12. Air collection pipe; 13. Pressure detector; 14. Discharge port; 15. Slide rail; 16. Hinge; 17. Box door; 18. Support column; 19. Rubber pad; 20. Controller; 21. Connecting plate; 22. Screw hole; 23. Bolt; 24. Shock absorber. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Reference Figure 1 , Figure 2 and Figure 4This utility model provides an embodiment of a rice polishing machine, including an outer casing 1. A top shell 3 is fixedly connected to the top of the outer casing 1, and the outer casing 1 and the top shell 3 are welded together. A polishing device is installed in the top shell 3 for polishing rice. A feeding hopper 4 is connected to the top right side of the top shell 3. The feeding hopper 4 is installed on the top of the top shell 3 for easy material feeding. A limiting plate 5 is fixedly connected to the middle of the inner wall of the feeding hopper 4. Inclined grooves 6 are formed around the inner wall of the limiting plate 5. The design of the inclined grooves 6 facilitates the flow of materials later. Multiple hollow columns 7 are connected to the front and rear sides of the feeding hopper 4. Telescopic columns 8 are slidably connected to the top of the multiple hollow columns 7. The hollow columns 7 and the telescopic columns 8 are sealed to facilitate gas injection and prevent gas leakage. The top of the multiple telescopic columns 8 penetrates the bottom of the limiting plate 5 and is fixedly connected to a metering plate 9. The telescopic column 8 completes the subsequent lifting process of the metering plate 9. Metering grooves 10 are opened on both the left and right sides of the metering plate 9. The metering grooves 10 and the inclined grooves 6 are closely fitted together. An air pump 11 is fixedly connected to the right side of the top shell 3. One end of the air pump 11 is connected to the air collection pipe 12. The bottom ends of multiple hollow columns 7 are connected to the top of the outer wall of the air collection pipe 12. The hollow columns 7 and the air collection pipe 12 are interconnected. By starting the air pump 11, appropriate gas is injected into the hollow columns 7, so that the telescopic column 8 drives the metering plate 9 to lift upward. The opening and closing size between the metering grooves 10 and the inclined grooves 6 is used to control the feeding speed. A pressure detector 13 is installed on the left side of the outer wall of the air collection pipe 12. The pressure detector 13 can monitor the air pressure inside the air collection pipe 12 in real time. A filter mechanism 2 is set inside the outer box 1. A discharge port 14 is opened on the left side of the top shell 3. A slide rail 15 is fixedly connected to the left side of the outer box 1.

[0040] Specifically, the outer casing 1 and the top shell 3 are welded together to ensure the overall structural strength and sealing, providing a stable working environment for the polishing machine. The polishing equipment is installed inside the top shell 3 to polish the rice, improving its quality and appearance. The feed hopper 4 is installed on top of the top shell 3 for easy rice feeding, ensuring smooth entry of the rice into the polishing machine. A limiting plate 5 is fixedly connected to the middle of the inner wall of the feed hopper 4. Inclined grooves 6 are formed around the inner wall of the limiting plate 5, optimizing the flow path of the rice and reducing the risk of blockage. Multiple hollow columns 7 are connected to the front and rear sides of the feed hopper 4, serving as gas transmission channels. Telescopic columns 8 are slidably connected to the top of the hollow columns 7. A sealed design is used between the hollow columns 7 and the telescopic columns 8, facilitating gas injection and effectively preventing gas leakage, ensuring the polishing process is smooth. The internal air pressure of the optical engine is stabilized; the tops of multiple telescopic columns 8 all penetrate the bottom of the limiting plate 5 and are fixedly connected to the metering plate 9. Through the telescopic movement of the telescopic columns 8, the metering plate 9 can be lifted, thereby controlling the amount of rice fed. Metering grooves 10 are opened on both the left and right sides of the metering plate 9. The metering grooves 10 and the inclined grooves 6 are closely fitted together to form the rice feeding channel. By adjusting the opening and closing size between the metering grooves 10 and the inclined grooves 6, the feeding speed of rice can be precisely controlled to meet different polishing requirements. An air pump 11 is fixedly connected to the right side of the top shell 3. One end of the air pump 11 is connected to the air collecting pipe 12. The bottom ends of the hollow columns 7 are all connected to the top of the outer wall of the air collecting pipe 12, ensuring that the gas can smoothly enter the hollow columns 7 and push the telescopic columns 8 to perform telescopic movement. A pressure detector 13 is installed on the left side of the outer wall of the air collecting pipe 12. The pressure detector 13 can monitor the air pressure inside the air collecting pipe 12 in real time.

[0041] Reference Figure 1 , Figure 2 and Figure 5The filtration mechanism 2 includes an exhaust cover 210, the bottom of which is fixedly connected to the top of the top shell 3. The exhaust cover 210 centrally discharges internal gas. An air inlet 201 is provided on the front side of the outer casing 1 to draw in external air, ensuring that the built-in fan can accurately deliver gas to the equipment surface for heat dissipation. A servo motor 202 is fixedly connected to the left side of the outer casing 1. The output end of the servo motor 202 passes through the left side of the outer casing 1 and is fixedly connected to a first rotating roller 203. A second rotating roller 204 is rotatably connected to the lower middle part of the inner wall of the outer casing 1. The first rotating roller 203 and the second rotating roller 204 are connected by a filter belt 205. The filter belt 205 is stretched and unfolded by the second rotating roller 204 and the first rotating roller 203. The surface of the filter belt 205 has sufficient openings to filter air. The filter belt 205 has pores for dust removal. When too much dust adheres to the surface of the filter belt 205, the filter belt 205 can be driven downward by starting the servo motor 202. The lower part of the inner wall of the outer box 1 is rotatably connected to the rotating roller 206. The rotating roller 206 and the rotating roller 204 are connected by the connecting belt 208. The outer wall of the rotating roller 206 is fixedly connected to the cleaning roller 207. At the same time, the rotating roller 204 and the rotating roller 206 are connected by the connecting belt 208. The cleaning roller 207 on the surface of the rotating roller 206 is driven by the connecting belt 208 to scrape off the dust on the surface of the filter belt 205. The filter mechanism 2 also includes a collection box 209. The outer wall of the collection box 209 is slidably connected to the bottom of the inner wall of the outer box 1. The scraped dust is collected and processed through the collection box 209, which improves heat dissipation efficiency and provides a fast cleaning effect.

[0042] Specifically, the exhaust cover 210 is fixedly connected to the top of the top shell 3, enabling the exhaust cover 210 to effectively concentrate the discharge of internal gas, ensuring smooth and efficient gas discharge. An air inlet 201 is provided on the front side of the outer casing 1, which draws in external air. Through the air inlet 201, external air is introduced into the filter mechanism 2, and then the built-in fan precisely delivers the gas to the equipment surface to achieve heat dissipation, preventing performance degradation or damage due to overheating. A servo motor 202 is fixedly connected to the left side of the outer casing 1. The output end of the servo motor 202 passes through the left side of the outer casing 1 and is fixedly connected to the first rotating roller 203. The first rotating roller 203 and the second rotating roller 204 are connected by a filter belt 205. The filter belt 205 is stretched and unfolded by the second rotating roller 204 and the first rotating roller 203. The surface of the filter belt 205 has holes sufficient to filter dust in the air, effectively preventing dust and other impurities from entering the equipment. When excessive dust adheres to the surface of the filter belt 205, the servo motor 202 can be activated to drive the filter belt 205 downwards, thereby achieving automatic cleaning of the filter belt, improving the cleaning efficiency of the filtration mechanism, and reducing the frequency of manual intervention. In addition, a rotating roller 3 206 is rotatably connected to the lower part of the inner wall of the outer casing 1. The rotating roller 3 206 is connected to the rotating roller 204 via a connecting belt 208, and a cleaning roller 207 is fixedly connected to the outer wall of the rotating roller 3 206. When the filter belt 205 moves, the connecting belt 208 drives the rotating roller 3 206 to rotate, thereby driving the cleaning roller 207 to scrape off the dust on the surface of the filter belt 205, further improving the cleaning effect of the filtration mechanism and ensuring the continuous and stable operation of the equipment. The outer wall of the collection box 209 is slidably connected to the bottom of the inner wall of the outer casing 1, which can collect and process the scraped dust through the collection box 209, which not only facilitates the dust cleaning work, but also improves the overall hygiene level of the equipment.

[0043] Reference Figure 1 , Figure 2 and Figure 3 The front side of the outer casing 1 is rotatably connected to a hinge 16, and the outer wall of the hinge 16 is rotatably connected to a door 17. The four corners of the bottom of the outer casing 1 are all fixedly connected to support columns 18. The support columns 18 improve the stability of the device. The bottom ends of the multiple support columns 18 are all fixedly connected to rubber pads 19. The rubber pads 19 can prevent the support columns 18 from directly contacting the ground and avoid friction. The right side of the outer casing 1 is fixedly connected to a controller 20. The controller 20 can conveniently perform simple operation control on the operating equipment of the entire device. The front and rear sides of the top shell 3 are all fixedly connected to multiple connecting plates 21. The bottom of the multiple connecting plates 21 is fixedly connected to a shock-absorbing plate 24. The top of the multiple connecting plates 21 is provided with screw holes 22, and the interior of the multiple screw holes 22 is threaded with bolts 23.

[0044] Specifically, a hinge 16 is installed on the front side of the outer casing 1. The hinge 16 not only serves as a connection but also allows the casing door 17 to rotate freely, ensuring both the flexibility of the casing door 17 and the stability of the overall structure. Support columns 18 are fixedly connected to the four corners at the bottom of the outer casing 1, providing stability. To prevent the support columns 18 from directly rubbing against the ground during use and causing unnecessary wear, a rubber pad 19 is fixedly connected to the bottom of each support column 18. The rubber pad 19 not only provides cushioning but also effectively protects the ground and avoids potential damage. Through this controller 20, the operating equipment on the device can be easily and simply controlled, greatly improving the convenience of use.

[0045] Working principle: First, the material is fed through the feeding hopper 4. The hollow column 7 and the telescopic column 8 are sealed, which not only facilitates the injection of gas, but also the metering groove 10 and the inclined groove 6 fit together to form the feeding channel of rice. By starting the air pump 11, appropriate gas is injected into the hollow column 7. The pressure detector 13 can monitor the air pressure inside the gas collection pipe 12 in real time, which causes the telescopic column 8 to lift the metering plate 9. The opening and closing size between the metering groove 10 and the inclined groove 6 is used to control the amount of rice fed and to precisely control the feeding speed of rice to meet different polishing requirements.

[0046] Furthermore, external air is introduced into the filter mechanism 2 through the air inlet 201, and then the built-in fan precisely delivers the gas to the surface of the equipment to achieve a heat dissipation effect. When too much dust adheres to the surface of the filter belt 205, the servo motor 202 is activated to drive the filter belt 205 to move downward. The rotating roller 3 206 is connected to the rotating roller 204 through the connecting belt 208, and a cleaning roller 207 is fixedly connected to the outer wall of the rotating roller 3 206. When the filter belt 205 moves, the connecting belt 208 drives the rotating roller 3 206 to rotate, thereby driving the cleaning roller 207 to scrape off the dust on the surface of the filter belt 205. The scraped dust is collected and processed through the collection box 209 at the bottom, which not only facilitates the dust cleaning work, but also improves the overall hygiene level of the equipment.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rice polishing machine, comprising an outer casing (1), characterized in that: The top of the outer casing (1) is fixedly connected to a top shell (3). The top right side of the top shell (3) is connected to a feed hopper (4). A limiting plate (5) is fixedly connected to the middle of the inner wall of the feed hopper (4). Inclined grooves (6) are provided around the inner wall of the limiting plate (5). Multiple hollow columns (7) are connected to the front and rear sides of the feed hopper (4). Telescopic columns (8) are slidably connected to the top of the multiple hollow columns (7). The tops of the multiple telescopic columns (8) all penetrate the limiting plate (5). The bottom of the shell (3) is fixedly connected to a metering plate (9), and metering grooves (10) are opened on both the left and right sides of the metering plate (9). An air pump (11) is fixedly connected to the right side of the top shell (3). One end of the air pump (11) is connected to a gas collecting pipe (12). The bottom ends of the multiple hollow columns (7) are connected to the top of the outer wall of the gas collecting pipe (12). A pressure detector (13) is installed on the left side of the outer wall of the gas collecting pipe (12). A filter mechanism (2) is provided inside the outer box (1).

2. The rice polishing machine according to claim 1, characterized in that: The filtration mechanism (2) includes an exhaust cover (210), the bottom of which is fixedly connected to the top of the top shell (3). An air inlet (201) is provided on the front side of the outer box (1). A servo motor (202) is fixedly connected to the left side of the outer box (1). The output end of the servo motor (202) passes through the left side of the outer box (1) and is fixedly connected to a first rotating roller (203). A second rotating roller (204) is rotatably connected to the lower part of the inner wall of the outer box (1). The first rotating roller (203) and the second rotating roller (204) are connected by a filter belt (205). A third rotating roller (206) is rotatably connected to the lower part of the inner wall of the outer box (1). The third rotating roller (206) and the second rotating roller (204) are connected by a connecting belt (208). A cleaning roller (207) is fixedly connected to the outer wall of the third rotating roller (206).

3. A rice polishing machine according to claim 2, characterized in that: The filtration mechanism (2) also includes a collection box (209), the outer wall of which is slidably connected to the bottom of the inner wall of the outer casing (1).

4. A rice polishing machine according to claim 1, characterized in that: The top shell (3) has a discharge port (14) on its left side, and the outer box (1) has a slide rail (15) fixedly connected to its left side.

5. A rice polishing machine according to claim 1, characterized in that: The front side of the outer box (1) is rotatably connected to a hinge (16), and the outer wall of the hinge (16) is rotatably connected to a box door (17).

6. A rice polishing machine according to claim 1, characterized in that: Support columns (18) are fixedly connected to the four corners of the bottom of the outer box (1), and rubber pads (19) are fixedly connected to the bottom of the multiple support columns (18).

7. A rice polishing machine according to claim 1, characterized in that: A controller (20) is fixedly connected to the right side of the outer casing (1), and multiple connecting plates (21) are fixedly connected to the front and rear sides of the top shell (3). A shock-absorbing plate (24) is fixedly connected to the bottom of the multiple connecting plates (21).

8. A rice polishing machine according to claim 7, characterized in that: Each of the connecting plates (21) has a screw hole (22) on its top, and each of the screw holes (22) has a bolt (23) threaded inside.

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