Step-by-step filling, mixing and stirring device for compound feed

Abstract

The utility model relates to the field of stirring devices, in particular to a step-by-step compound feed filling, mixing and stirring device. The technical problems that according to an existing stirring and mixing device, a single tank is generally adopted for uniformly mixing and stirring different feeds and additives, and due to the fact that part of the feeds and the additives need to be filled and uniformly stirred after raw materials are mixed or in the midway, the uniform mixing of the single tank cannot guarantee that the raw materials are properly and uniformly distributed in the mixing process; part of the feed and the additive are not uniformly mixed, so that the quality and the effect of the feed are influenced. According to the technical scheme, the step-by-step compound feed filling, mixing and stirring device comprises a mixing tank, a mixing assembly and a filling assembly; the driving motor is connected with the driving rod and is combined with the stirring frame to preliminarily stir and mix feed, a continuous and stable stirring effect is provided, feed raw materials with different components are mixed together, the mixing uniformity is ensured, meanwhile, the stirring speed and force are accurately controlled, and diversified requirements in production are met.

Description

Technical Field

[0001] The utility model relates to the field of stirring devices, in particular to a compound feed step-by-step filling, mixing and stirring device. Background Art

[0002] Feed refers to food used to feed livestock, poultry and other farmed animals. It is prepared by mixing raw materials of different types and proportions to meet the nutrients needed for animal growth, development and production, so as to maintain the health of animals, promote growth and increase production performance. When the feed is mixed and stirred, a mixing and stirring device is needed to mix different feed raw materials together and stir them to prepare compound feed, so as to ensure that the prepared compound feed meets the requirements. In the existing mixing and stirring devices, different feeds and additives are usually mixed and stirred uniformly in a single tank during the processing. Since some feeds and additives need to be added and stirred evenly after the raw materials are mixed or in the middle, the uniform mixing of a single tank cannot ensure that the raw materials are properly evenly distributed during the mixing process, resulting in uneven mixing of some feeds and additives, affecting the quality and effect of the feed. Therefore, we propose a compound feed gradual filling mixing and stirring device to solve the above-mentioned problems. Utility Model Content

[0003] In order to overcome the existing stirring and mixing devices, a single tank is usually used to uniformly mix and stir different feeds and additives. Since some feeds and additives need to be added and stirred evenly after the raw materials are mixed or in the middle, the uniform mixing of a single tank cannot ensure that the raw materials are properly evenly distributed during the mixing process, resulting in uneven mixing of some feeds and additives, affecting the quality and effect of the feed.

[0004] The technical solution of the utility model is: a compound feed gradually filling mixing and stirring device, comprising a mixing tank, a mixing component and a filling component; the interior of the mixing tank is equipped with a mixing component for uniformly mixing feed raw materials and additives of different components, and the outer end of the mixing tank is equipped with a filling component for gradually adding feed raw materials and additives into the device and mixing them during the feed production process.

[0005] Preferably, the feed is initially stirred and mixed by connecting the driving motor to the driving rod in combination with the stirring frame, providing a continuous and stable stirring action, mixing the feed raw materials of different ingredients together, ensuring the uniformity of the mixing, and accurately controlling the stirring speed and strength to meet the diverse needs in production, and the driving rod is used in combination with the connecting frame to connect the reinforcing rod to mix the filled feed again, and some additives are mixed with the mixed feed to achieve the gradual addition and mixing of the feed, and the feed is connected to the connecting pipe by a docking plate and transmitted from the feeding pipe to the inside of the mixing tank, ensuring good sealing and matching between the feed transmission pipe and the feeding pipe, making the transmission process smoother and more efficient, and effectively preventing feed impurities and foreign matter from entering the mixing tank, reducing the risk of cross contamination of feed raw materials, and inducing mixing by the sensor. The material opens the electromagnetic valve to transfer the material to the filling tank and gradually add additives for mixing, so as to realize the automatic transfer of the material to the filling tank, avoid the material from being stationary for a long time or excessively transferred, and save energy consumption. The limit block is used to connect the cover plate and the telescopic card block to be clamped into the positioning block, so that the cover plate and the filling tank are buckled and sealed, which effectively prevents the leakage and volatilization of feed and additives during the mixing process, maintains the hygiene and safety of the production site, prevents the leakage of feed raw materials or additives during the filling and mixing process, and avoids the pollution and waste of raw materials. At the same time, the rotating motor is connected to the rotating rod in combination with the spiral frame to mix and stir the feed with additives again, so that the feed raw materials and additives are mixed more evenly, so as to realize the automated production process, adapt to the mixing requirements of different feed raw materials, and meet the production requirements of mixing different raw materials.

[0006] Preferably, the mixing assembly includes a sealing cover, a driving motor, a driving rod, a stirring frame, a partition, a connecting frame, a reinforcing rod, a feeding tube, a docking plate, a fixing block and a supporting column. A sealing cover is provided above the mixing tank, a driving motor is provided above the sealing cover, a driving rod is provided between the driving motor and the sealing cover, the driving rod passes through the sealing cover and extends to the interior of the mixing tank, a stirring frame is provided on the outer wall of the driving rod, and a partition is provided on the outer wall of the driving rod. The feed is initially stirred and mixed by using the driving motor connected to the driving rod in combination with the stirring frame, providing a continuous and stable stirring action, mixing feed raw materials of different components together, ensuring the uniformity of the mixing, and at the same time accurately controlling the stirring speed and strength to meet the diverse needs in production.

[0007] Preferably, the mixing tank is divided into a main tank and a sub-tank by a partition, the driving rod is located inside the sub-tank and is surrounded by a plurality of connecting frames, and a plurality of reinforcing rods are provided inside the connecting frames. The reinforcing rods are connected to the driving rods in combination with the connecting frames to mix the filled feed again, and part of the additives are mixed with the feed raw materials to achieve gradual addition and mixing of the feed.

[0008] Preferably, a feeding pipe is provided at the upper edge of the sealing cover, a docking plate is provided at the end of the feeding pipe away from the sealing cover, a plurality of groups of fixed blocks are provided around the outer wall of the mixing tank, and a support column is provided at one end of the fixed block. The feed is transferred from the feeding pipe to the inside of the mixing tank by docking the feed pipe with the docking plate, thereby ensuring good sealing and fit between the feed transmission pipe and the feeding pipe, making the transmission process smoother and more efficient, and effectively preventing feed impurities and foreign matter from entering the mixing tank, thereby reducing the risk of cross-contamination of feed raw materials.

[0009] Preferably, the filling assembly includes a filling tank, a cover plate, a docking frame, a sensor, an electromagnetic valve, a limit block, a telescopic block, a positioning block, a rotating motor, a rotating rod, a spiral frame, a transmission pipe, a transmission valve and a fixed column. The filling tank is located on the outer wall of the mixing tank. A docking frame is provided between the filling tank and the mixing tank. The filling tank is fixedly connected to the mixing tank through the docking frame. A sensor is provided at the outer end of the docking frame. An electromagnetic valve is provided on the outside of the sensor. The electromagnetic valve is electrically connected to the sensor. The sensor is used to sense the mixed material and open the electromagnetic valve to transfer the material to the filling tank and gradually add additives for mixing, thereby realizing automatic transmission of the material to the filling tank, avoiding long-term static or excessive transmission of the material, saving energy consumption, and improving production efficiency and product quality.

[0010] Preferably, a cover plate is provided above the filling tank, a limit block is provided around the outer wall of the cover plate, a telescopic clamping block is provided inside the limit block, the positioning block is located on the outer wall of the filling tank, the limit block is fixedly connected to the positioning block through the telescopic clamping block, and a filling pipe is provided at the upper edge of the cover plate. The cover plate is connected by the limit block and the telescopic clamping block is clamped into the positioning block, so that the cover plate and the filling tank are buckled and sealed, which effectively prevents leakage and volatilization of feed and additives during the mixing process, maintains the hygiene and safety of the production site, prevents leakage of feed raw materials or additives during the filling and mixing process, and avoids pollution and waste of raw materials.

[0011] Preferably, a rotating motor is provided at the center above the cover plate, a rotating rod is provided between the rotating motor and the cover plate, the rotating rod passes through the cover plate and extends to the interior of the filling tank, a spiral rack is provided on the outer wall of the rotating rod, a transmission pipe is provided at the lower end of the filling tank, a transmission valve is provided at the outer end of the transmission pipe, the filling tank is connected to the mixing tank through the transmission pipe, and a plurality of groups of fixed columns are provided around the lower end of the filling tank. The feed with additives is mixed and stirred again by using a rotating motor connected to the rotating rod in combination with the spiral rack, so that the feed raw materials and additives are mixed more evenly, the mixing effect is improved, an automated production process is realized, the stirring requirements of different feed raw materials are adapted, and the production requirements of mixing different raw materials are met.

[0012] Beneficial effects of the utility model:

[0013] 1. Compared with the traditional mixing and stirring device, the feed is initially stirred and mixed by connecting the driving motor to the driving rod in combination with the stirring frame, providing continuous and stable stirring action, mixing feed raw materials of different components together, ensuring the uniformity of mixing, and accurately controlling the stirring speed and strength to meet the diversified needs in production. The feed docking tube is connected by a docking plate and transmitted from the feeding pipe to the mixing tank, ensuring good sealing and matching between the feed transmission pipe and the feeding pipe, making the transmission process smoother and more efficient, and effectively preventing feed impurities and foreign matter from entering the mixing tank, reducing the risk of cross contamination of feed raw materials.

[0014] 2. The sensor senses the mixed material and opens the electromagnetic valve to transfer the material to the filling tank, gradually adding additives for mixing, so as to realize the automatic transfer of materials to the filling tank, avoid long-term static or excessive transfer of materials, save energy consumption, improve production efficiency and product quality, use the limit block to connect the cover plate and the telescopic card block to the positioning block, so that the cover plate and the filling tank are buckled and sealed, effectively preventing the leakage and volatilization of feed and additives during the mixing process, maintaining the hygiene and safety of the production site, preventing the leakage of feed raw materials or additives during the filling and mixing process, avoiding pollution and waste of raw materials, and rotating the motor to connect the rotating rod and the spiral frame to mix and stir the feed with additives again, so as to mix the feed raw materials and additives more evenly, realize the automated production process, adapt to the mixing requirements of different feed raw materials, and meet the production requirements of mixing different raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the mixing tank of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the hybrid component of the utility model;

[0018] Figure 4 This is a schematic diagram of the filling component structure of the utility model;

[0019] Figure 5 It is a schematic diagram of the internal structure of the filling tank of the utility model.

[0020] Explanation of the reference numerals: 1. mixing tank; 2. mixing assembly; 201. sealing cover; 202. driving motor; 203. driving rod; 204. stirring frame; 205. partition; 206. connecting frame; 207. reinforcing rod; 208. feeding pipe; 209. docking plate; 210. fixing block; 211. supporting column; 3. filling assembly; 301. filling tank; 302. cover plate; 303. docking frame; 304. sensor; 305. solenoid valve; 306. limit block; 307. telescopic block; 308. positioning block; 309. rotating motor; 310. rotating rod; 311. spiral frame; 312. transmission pipe; 313. transmission valve; 314. fixing column. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] See also Figure 1-5 The utility model provides an embodiment: a compound feed gradual filling mixing and stirring device, comprising a mixing tank 1, a mixing component 2 and a filling component 3; the mixing tank 1 is internally installed with a mixing component 2 for uniformly mixing feed raw materials and additives of different components, and the outer end of the mixing tank 1 is installed with a filling component 3 for gradually adding feed raw materials and additives into the device and mixing them during the feed production process.

[0023] See also Figure 1-2 In this embodiment, the mixing assembly 2 includes a sealing cover 201, a driving motor 202, a driving rod 203, a stirring frame 204, a partition 205, a connecting frame 206, a reinforcing rod 207, a feeding pipe 208, a docking plate 209, a fixing block 210 and a supporting column 211. A sealing cover 201 is provided above the mixing tank 1, a driving motor 202 is provided above the sealing cover 201, a driving rod 203 is provided between the driving motor 202 and the sealing cover 201, the driving rod 203 passes through the sealing cover 201 and extends to the inside of the mixing tank 1, a stirring frame 204 is provided on the outer wall of the driving rod 203, a partition 205 is provided on the outer wall of the driving rod 203, and a reinforcing rod 207 is provided on the outer wall of the driving motor 202. The driving rod 203 is combined with the stirring frame 204 to perform preliminary stirring and mixing of the feed, providing a continuous and stable stirring action, mixing feed materials of different components together, ensuring the uniformity of the mixing, and accurately controlling the stirring speed and strength to meet the diverse needs in production. The mixing tank 1 is separated into a main tank and a sub-tank by a partition 205. The driving rod 203 is located inside the sub-tank and is surrounded by a plurality of connecting frames 206. The connecting frames 206 are provided with a plurality of reinforcing rods 207. The driving rod 203 is combined with the connecting frames 206 to connect the reinforcing rods 207 to mix the filled feed again, mix part of the additives with the feed raw materials, and realize the gradual addition of the feed for mixing and stirring.

[0024] See also Figure 2-3 In this embodiment, a feeding pipe 208 is provided at the upper edge of the sealing cover 201, and a docking plate 209 is provided at one end of the feeding pipe 208 away from the sealing cover 201. A plurality of fixed blocks 210 are arranged around the outer wall of the mixing tank 1, and a support column 211 is provided at one end of the fixed block 210. The feed docking pipe is connected with the docking plate 209 to be transmitted from the feeding pipe 208 to the inside of the mixing tank 1, thereby ensuring good sealing and matching between the feed transmission pipe 312 and the feeding pipe 208, making the transmission process smoother and more efficient, and effectively preventing feed impurities and foreign matter from entering the inside of the mixing tank 1, thereby reducing the risk of cross contamination of feed raw materials. The filling component 3 includes a filling tank 301, a cover plate 302, a docking frame 303, a sensor 304, an electromagnetic valve 305, a limit block 306, a telescopic block 307, and a positioning block 308. 08. Rotating motor 309, rotating rod 310, spiral frame 311, transmission pipe 312, transmission valve 313 and fixed column 314. Filling tank 301 is located on the outer wall of mixing tank 1. A docking frame 303 is provided between filling tank 301 and mixing tank 1. Filling tank 301 is fixedly connected with mixing tank 1 through docking frame 303. A sensor 304 is provided at the outer end of docking frame 303. A solenoid valve 305 is provided on the outer side of sensor 304. Solenoid valve 305 is electrically connected with sensor 304. The solenoid valve 305 is opened by using sensor 304 to sense the mixed material and transmit the material to filling tank 301 to gradually add additives for mixing, thereby realizing automatic transmission of material to filling tank 301, avoiding long-term static or excessive transmission of material, saving energy consumption, and improving production efficiency and product quality.

[0025] See also Figure 3-5In this embodiment, a cover plate 302 is provided above the filling tank 301, and a limit block 306 is provided around the outer wall of the cover plate 302. A telescopic block 307 is provided inside the limit block 306. A positioning block 308 is located on the outer wall of the filling tank 301. The limit block 306 is fixedly connected to the positioning block 308 through the telescopic block 307. A filling pipe is provided at the upper edge of the cover plate 302. The limit block 306 is used to connect the cover plate 302 and the telescopic block 307 is clamped into the positioning block 308, so that the cover plate 302 and the filling tank 301 are buckled and sealed, which effectively prevents the leakage and volatilization of feed and additives during the mixing process, maintains the hygiene and safety of the production site, prevents the leakage of feed raw materials or additives during the filling and mixing process, and avoids the pollution and waste of raw materials. A rotary A rotating motor 309 is provided between the rotating motor 309 and the cover plate 302, and the rotating rod 310 passes through the cover plate 302 and extends to the inside of the filling tank 301. A spiral rack 311 is provided on the outer wall of the rotating rod 310, and a transmission pipe 312 is provided at the lower end of the filling tank 301. A transmission valve 313 is provided at the outer end of the transmission pipe 312. The filling tank 301 is connected to the mixing tank 1 through the transmission pipe 312. A plurality of fixed columns 314 are provided around the lower end of the filling tank 301. The feed with additives is mixed and stirred again by using the rotating motor 309 to connect the rotating rod 310 and the spiral rack 311, so that the feed raw materials and additives are mixed more evenly, the mixing effect is improved, the automated production process is realized, the stirring requirements of different feed raw materials are adapted, and the production requirements of mixing different raw materials are met.

[0026] When working, firstly, the docking tube is docked and fixed with the docking plate 209, and the feed raw materials to be mixed and stirred are transmitted from the docking tube to the inside of the mixing tank 1 through the feeding tube 208, ensuring good sealing and matching between the feed transmission tube 312 and the feeding tube 208, so that the transmission process is smoother and more efficient, and at the same time, it is effectively prevented that feed impurities and foreign matter enter the upper end of the internal partition 205 of the mixing tank 1. After the feed is initially added, the driving motor 202 is started first to connect the driving rod 203 to drive the stirring frame 204 to perform preliminary stirring and mixing on the feed raw materials in the main tank, providing continuous and stable stirring action, mixing feed raw materials of different ingredients together, and at the same time accurately controlling the stirring speed and strength to ensure To ensure the uniformity of mixing, after the feed is fully stirred and mixed, when the driving rod 203 rotates, part of the feed is stirred and pushed to the inside of the docking frame 303 by the stirring rod, and at the same time, the controller senses that the feed is fully mixed and transmits the information to the electromagnetic valve 305, and uses the electromagnetic valve 305 to open the inside of the docking frame 303 to transfer the mixed feed to the filling tank 301, so as to realize the automatic transmission of the material to the filling tank 301, avoid the material from being left still for a long time or being excessively transmitted, and transmit the required additives to the filling tank 301 through the filling pipe, start the rotating motor 309 to connect the rotating rod 310 and combine with the spiral frame 311 to stir and mix the feed and additives again, so as to realize the gradual addition and mixing of the feed.

[0027] Before the feed is mixed and stirred with additives by the spiral frame 311, the limit block 306 is used to connect the cover plate 302 and the telescopic block 307 to be clamped into the positioning block 308, so that the cover plate 302 and the filling tank 301 are buckled and sealed, effectively preventing the leakage and volatilization of the feed and additives during the mixing process, maintaining the hygiene and safety of the production site, preventing the leakage of feed raw materials or additives during the filling and mixing process, and avoiding the pollution and waste of raw materials. After the feed and additives are mixed, the transmission valve 313 is opened to transmit the raw materials from the transmission pipe 312 to the inside of the auxiliary tank, and the driving motor 202 is started again to connect the driving rod 203 and the connecting frame 206 to connect the reinforcing rod 207 to mix the filled feed again, mix part of the additives with the feed raw materials, and realize the gradual addition and mixing of the feed. The device can preferentially use the stirring frame 204 to preliminarily mix the raw materials in the main tank, and transmit the mixed raw materials to the filling tank 301 to add additives for secondary mixing and stirring, so as to realize the device and the feed are gradually filled and mixed.

[0028] Through the above steps, the feed is initially stirred and mixed by driving the motor 202 to connect the driving rod 203 and the stirring frame 204, providing a continuous and stable stirring effect, mixing the feed raw materials of different ingredients together, ensuring the uniformity of the mixing, and accurately controlling the stirring speed and strength to meet the diversified needs in production. The driving rod 203 is combined with the connecting frame 206 to connect the reinforcing rod 207 to mix the filled feed again, and some additives are mixed with the mixed feed to achieve the gradual addition and mixing of the feed. The feed is connected to the docking plate 209 and the feed is transferred from the feeding pipe 208 to the inside of the mixing tank 1, ensuring good sealing and matching between the feed transmission pipe 312 and the feeding pipe 208, making the transmission process smoother and more efficient, and effectively preventing feed impurities and foreign matter from entering the inside of the mixing tank 1, reducing the risk of cross contamination of feed raw materials, and sensing the mixing by the sensor 304. The electromagnetic valve 305 is opened when the material is mixed to transfer the material to the filling tank 301, and the additives are gradually added for mixing, so as to realize the automatic transfer of the material to the filling tank 301, avoid the material from being static for a long time or being transferred excessively, and save energy consumption. The limit block 306 is used to connect the cover plate 302 and the telescopic clamping block 307 to be clamped into the positioning block 308, so that the cover plate 302 and the filling tank 301 are buckled and sealed, which effectively prevents the leakage and volatilization of the feed and additives during the mixing process, maintains the hygiene and safety of the production site, prevents the feed raw materials or additives from leaking during the filling and mixing process, and avoids the pollution and waste of the raw materials. At the same time, the rotating motor 309 is connected to the rotating rod 310 and combined with the spiral frame 311 to mix and stir the feed with the additives again, so that the feed raw materials and additives are mixed more evenly, and the automated production process is realized, which adapts to the stirring requirements of different feed raw materials and meets the production requirements of mixing different raw materials.

[0029] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A device for gradually adding mixed feed to a compound feed, comprising a mixing tank (1); characterized in that: The device also comprises a mixing component (2) and a filling component (3); the mixing component (2) for uniformly mixing feed raw materials and additives of different components is installed inside the mixing tank (1); the filling component (3) for gradually adding feed raw materials and additives into the device and mixing them during the feed production process is installed at the outer end of the mixing tank (1); the filling component (3) comprises a filling tank (301), a cover plate (302), a docking frame (303), a sensor (304), an electromagnetic valve (305), a limit block (306), a telescopic block (307), a positioning block (308), a rotating motor (309), a rotating rod (310), a spiral frame (311), a transmission pipe (312), a transmission valve (313) and a fixing column (314); the filling tank (301) is located on the outer wall of the mixing tank (1); a docking frame (303) is provided between the filling tank (301) and the mixing tank (1); (301) is fixedly connected to the mixing tank (1) through a docking frame (303); an inductor (304) is provided at the outer end of the docking frame (303); an electromagnetic valve (305) is provided on the outer side of the inductor (304); the electromagnetic valve (305) is electrically connected to the inductor (304); a rotating motor (309) is provided at the center above the cover plate (302); a rotating rod (310) is provided between the rotating motor (309) and the cover plate (302); the rotating rod (310) passes through the cover plate (302) and extends to the inside of the filling tank (301); a spiral frame (311) is provided on the outer wall of the rotating rod (310); a transmission pipe (312) is provided at the lower end of the filling tank (301); a transmission valve (313) is provided at the outer end of the transmission pipe (312); the filling tank (301) is connected to the mixing tank (1) through the transmission pipe (312); and a plurality of fixed columns (314) are provided around the lower end of the filling tank (301).

2. A compound feed step-by-step filling, mixing and stirring device according to claim 1, characterized in that: The mixing assembly (2) comprises a sealing cover (201), a driving motor (202), a driving rod (203), a stirring frame (204), a partition (205), a connecting frame (206), a reinforcing rod (207), a feeding pipe (208), a docking plate (209), a fixing block (210) and a supporting column (211). The sealing cover (201) is arranged above the mixing tank (1), the driving motor (202) is arranged above the sealing cover (201), a driving rod (203) is arranged between the driving motor (202) and the sealing cover (201), the driving rod (203) passes through the sealing cover (201) and extends to the interior of the mixing tank (1), the stirring frame (204) is arranged on the outer wall of the driving rod (203), and the partition (205) is arranged on the outer wall of the driving rod (203).

3. A compound feed step-by-step filling, mixing and stirring device according to claim 2, characterized in that: The mixing tank (1) is divided into a main tank and a sub-tank by a partition (205); the driving rod (203) is located inside the sub-tank and is surrounded by a plurality of connecting frames (206); and a plurality of reinforcing rods (207) are provided inside the connecting frame (206).

4. The device for gradually filling and mixing compound feed according to claim 2, characterized in that: A feeding pipe (208) is provided at the upper edge of the sealing cover (201), a docking plate (209) is provided at one end of the feeding pipe (208) away from the sealing cover (201), a plurality of groups of fixing blocks (210) are provided around the outer wall of the mixing tank (1), and a support column (211) is provided at one end of the fixing block (210).

5. The device for gradually filling and mixing compound feed according to claim 1, characterized in that: A cover plate (302) is provided above the filling tank (301); a limit block (306) is provided around the outer wall of the cover plate (302); a telescopic clamping block (307) is provided inside the limit block (306); a positioning block (308) is located on the outer wall of the filling tank (301); the limit block (306) is fixedly connected to the positioning block (308) via the telescopic clamping block (307); and a filling pipe is provided on the upper edge of the cover plate (302).

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