A chrome-free tinplate and surface treatment method thereof

Abstract

The present invention relates to the technical field of tinplate, and in particular to a chrome-free tinplate and a surface treatment method thereof, wherein the bottom plate is in the shape of a cuboid, and a rectangular groove is arranged on the upper surface of the bottom plate; a truncated cone block is arranged in the circular hole; the truncated cone block passes through the circular hole, and the diameter of the truncated cone on the side close to the air permeable plate is smaller than the diameter of the circular hole, and the diameter of the side away from the air permeable plate is larger than the diameter of the circular hole; the number of the truncated cones is at least two; a movable rod is fixedly connected to a side of the movable plate away from the air permeable plate; the other end of the movable rod passes through the bottom plate and is fixedly connected to a support block; a tension spring is sleeved on the movable rod; the present invention presses the bottom plate by the weight of the food itself, and then cooperates with the movable plate to move in the opposite direction relative to the truncated cone block, and the movable plate controls the connection size between the bottom of the food and the desiccant according to the gravity of the food, so that the desiccant can automatically adjust the contact area with the air in the food according to the weight of the food, so that the desiccant can be effectively utilized to the maximum extent, making the present invention more reasonable.

Description

Technical Field

[0001] The invention relates to the technical field of tinplates, and in particular to a chrome-free tinplate and a surface treatment method thereof. Background Art

[0002] Tinplate has the advantages of being odorless, non-toxic, light in weight, and easy to process and shape. In order to improve the chemical stability of the tinplate, the surface of the tinplate must be passivated to make a chrome-free tinplate. In the prior art, chrome-free tinplates are usually combined to form a special chrome-free tinplate, so that the chrome-free tinplate is widely used in food packaging, electronic devices, chemical paints and other fields. In the field of food packaging, the chrome-free tinplate can only be used as a packaging material without a drying effect, so that the chrome-free tinplate does not have the function of drying the surrounding environment.

[0003] In the prior art, the chrome-free tinplate is spliced ​​into a bottom plate for holding food in a food barrel. Since the food needs to be kept dry, a desiccant is placed in the bottom plate of the food barrel. The bottom plate of the food barrel is connected to the food inside through a through hole, so that the desiccant in the food barrel can dry the food on the upper end surface of the bottom plate. However, the chrome-free tinplate with desiccant cannot automatically control the surrounding drying effect according to the amount of packaged food, resulting in the limitation of the chrome-free tinplate as a packaging material.

[0004] In view of this, in order to overcome the above technical problems, the present invention proposes a chrome-free tinplate and a surface treatment method thereof, which solves the above technical problems. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, the present invention proposes a chrome-free tinplate and a surface treatment method thereof, which presses the bottom plate with the gravity of the food itself, and then cooperates with the movable plate to move in the opposite direction relative to the truncated cone block, so that in the food packaging box, the desiccant between the movable plate and the bottom of the No. 1 rectangular groove is connected with the inside of the food barrel, thereby ensuring that the food is in a dry environment and improving the quality of the food after long-term storage; at the same time, the movable plate controls the connection size between the bottom of the food and the desiccant according to the gravity of the food, so that the desiccant can automatically adjust the contact area with the air in the food according to the weight of the food, so that the desiccant can be effectively utilized to the maximum extent, reducing the replacement of the desiccant, and thereby improving the practical application effect of the present invention.

[0006] The technical solution adopted by the present invention for its technical problem is: the chrome-free tin-plated plate described in the present invention comprises a bottom plate; the bottom plate is in the shape of a rectangular parallelepiped, and a rectangular groove No. 1 is arranged on the upper surface of the bottom plate; a breathable plate is fixedly connected to the groove opening of the rectangular groove No. 1; a movable plate is arranged on the side of the breathable plate close to the groove bottom of the rectangular groove No. 1; the movable plate is slidably and sealedly connected to the groove wall of the rectangular groove No. 1, and a circular hole is arranged on the movable plate; a truncated cone block is arranged in the circular hole; a side of the truncated cone block close to the groove bottom of the rectangular groove No. 1 is tightly attached to the groove bottom of the rectangular groove No. 1 ; The truncated cone block passes through the circular hole, the diameter of the truncated cone block close to the air-permeable plate is smaller than the diameter of the circular hole, and the diameter of the side away from the air-permeable plate is larger than the diameter of the circular hole; the number of the truncated cone blocks is at least two; the movable plate is fixedly connected to a movable rod on the side away from the air-permeable plate; the other end of the movable rod passes through the bottom plate and is fixedly connected to a support block; a tension spring is sleeved on the movable rod; one end of the tension spring is fixed to the movable plate, and the other end of the tension spring is fixed to the inner wall of the bottom plate; a desiccant is contained in the No. 1 rectangular groove; the desiccant is located between the movable plate and the bottom of the No. 1 rectangular groove;

[0007] When working, in the field of food packaging, the chrome-free tinplate can only be used as a packaging material without any drying effect. Therefore, in the prior art, a desiccant is placed in the chrome-free tinplate to achieve the purpose of drying. However, the chrome-free tinplate with a desiccant cannot automatically control the drying effect according to the amount of packaged food, resulting in the limitation of the chrome-free tinplate as a packaging material.

[0008] Therefore, when using the present invention, the staff puts a desiccant between the movable plate and the bottom of the No. 1 rectangular groove. At this time, the movable plate is pressed against the truncated cone block under the action of the tension spring, and the truncated cone block supports the movable plate to limit the movable plate; a sealed environment is formed between the truncated cone block and the movable plate; thereby, the desiccant no longer absorbs moisture from the outside air; food is put into the food barrel, the food stays on the air-permeable plate, and the air-permeable plate transmits the gravity of the food to the bottom plate, so that the bottom plate is subjected to a downward force, and the bottom plate moves downward, so that the truncated cone block moves downward with the bottom plate; thereby, the movable plate moves upward relative to the truncated cone block, and at this time, a gap appears between the circular hole on the movable plate and the truncated cone block, so that the side of the movable plate close to the bottom of the No. 1 rectangular groove is connected with the side of the movable plate away from the No. 1 rectangular groove, and the desiccant can absorb moisture from the food inside the food barrel; under the action of the tension spring, the greater the gravity of the food, the larger the diameter of the gap between the movable plate and the truncated cone block, and the greater the effect of the desiccant in absorbing moisture;

[0009] The present invention presses the food to the bottom plate by its own gravity, and then cooperates with the movable plate to move in the opposite direction relative to the truncated cone block, so that when there is food in the food barrel, the desiccant is connected with the inside of the food barrel, thereby ensuring that the food is in a dry environment and improving the quality of the food after long-term storage; at the same time, the movable plate controls the connection size between the bottom of the food and the desiccant according to the gravity of the food, so that the desiccant can automatically adjust the contact area with the air in the food according to the weight of the food, so that the desiccant can be effectively utilized to the maximum extent, reducing the replacement of the desiccant by the staff, thereby improving the practical application effect of the present invention; at the same time, when the staff picks up the food barrel, the movable plate is no longer subjected to the force of the movable rod, and is driven by the tension spring to move the movable plate toward the bottom of the No. 1 rectangular groove. At this time, the space between the movable plate and the bottom of the No. 1 rectangular groove is reduced, so that the air at the desiccant moves to the side of the movable plate close to the air permeable plate; the air flow is increased, and the dryness inside the food barrel is ensured; making the present invention more reasonable.

[0010] Preferably, a second rectangular groove is provided on the side of the bottom plate; a flap is provided at the notch of the second rectangular groove; the flap is rotatably connected to the notch of the second rectangular groove through a torsion spring; the size of the flap is the same as that of the second rectangular groove; the interior of the truncated cone block is hollow;

[0011] During operation, if the desiccant is not replaced for a long time, the desiccant absorbs too much moisture, causing the desiccant to become ineffective, so the desiccant needs to be replaced. At this time, the staff opens the flap and fills the desiccant between the movable plate and the bottom of the No. 1 rectangular groove. After the filling is completed, the flap is automatically reset under the action of the torsion spring; the interior of the truncated cone is set to be hollow, which saves material and reduces weight; the present invention arranges a flap on the side of the bottom plate, making it more convenient to fill the desiccant, and the flap and the bottom plate are connected by a torsion spring, making it easier for the staff to close the flap, thereby improving the practicality of the present invention. At the same time, the interior of the truncated cone block is set to be hollow, which saves material costs and reduces transportation costs.

[0012] Preferably, the hole wall of the circular hole is inclined, and the hole wall of the circular hole is in contact with the outer wall of the truncated cone block; a side of the flip cover close to the bottom of the first rectangular groove is provided with an inclined surface; a connection between the bottom plate and the flip cover is provided with an inclined surface; the inclined surface of the flip cover close to the bottom of the first rectangular groove is in contact with the inclined surface of the connection between the bottom plate and the flip cover;

[0013] During operation, when there is no food in the food barrel, the movable plate moves to a position close to the bottom of the No. 1 rectangular groove, and moves to the truncated cone block to hold the movable plate. At this time, the hole wall of the circular hole fits with the outer wall of the truncated cone block, so that the air in the movable plate close to the air-permeable plate and the air in the movable plate away from the air-permeable plate no longer flow, and at the same time, the inclined surface of the flip cover close to the bottom of the No. 1 rectangular groove fits with the inclined surface of the connection between the bottom plate and the flip cover, thereby reducing the entry of external air between the movable plate and the bottom of the No. 1 rectangular groove; the present invention reduces the circulation of air between the movable plate and the bottom of the No. 1 rectangular groove and external air by fitting the hole wall of the circular hole with the outer wall of the truncated cone block, so that when there is no food in the food barrel, the desiccant reduces the absorption of moisture in the external air, thereby extending the service life of the desiccant, reducing the frequency of replacement of the desiccant by the staff, and making the present invention more practical.

[0014] Preferably, the center of the No. 1 rectangular groove is rotatably connected to a rotating block; the outer wall of the rotating block is evenly fixedly connected to a rotating rod; the other end of the rotating rod is fixedly connected to a corresponding truncated cone block;

[0015] During operation, when the desiccant becomes ineffective, it is necessary to replace the desiccant. The staff presses the support block to move the movable plate to the farthest distance from the bottom of the No. 1 rectangular slot. At this time, the flap is opened to take out the ineffective desiccant between the two adjacent truncated cone blocks near the flap. Then, the truncated cone block is rotated. The truncated cone block moves in an arc under the action of the rotating rod, and the ineffective desiccant far away from the flap is rotated to the position close to the flap, and this process is repeated until all the ineffective desiccant is taken out. Then, the staff fills the unused desiccant by first filling the unused desiccant between the two adjacent truncated cone blocks near the flap. After the desiccant is filled, the truncated cone block is rotated to fill the truncated cone block in the other direction, and this process is repeated until the desiccant is filled in each direction. Then, the truncated cone block is rotated to the corresponding position of the circular hole. At this time, the flap is closed, and the staff stops pressing the support block to return the movable plate to the initial position.

[0016] The present invention arranges a rotating rod between the truncated cone blocks and arranges a rotating block in the middle of the rotating rod. When taking out the failed desiccant, the failed desiccant is prevented from being adhered to the bottom of the No. 1 rectangular groove and cannot be taken out, so that the process of taking out the failed desiccant is simpler; when filling new desiccant, the filling is more uniform, so that the filling amount is larger; therefore, the present invention has the characteristics of strong practicality and high work efficiency.

[0017] Preferably, a limit rod is hinged on one side of the bottom plate close to the support block; the length of the limit rod is equal to the length of the movable rod protruding from the bottom plate; during operation, when there is no food in the food barrel, the movable plate and the truncated cone block are fitted together, and at this time the limit rod is rotated to the support block to limit the movement of the support block, so that the position of the movable plate is limited; the support block is prevented from being subjected to external force so that a gap appears between the movable plate and the truncated cone block, thereby accelerating the failure of the desiccant; the present invention locks the position of the movable plate by hingedly connecting the limit rod to one side of the bottom plate close to the support block, so that the desiccant is in a sealed state, thereby further extending the service life of the desiccant, and making the present invention more reasonable.

[0018] The present invention mainly aims at combining and splicing chrome-free tinplates into a special chrome-free tinplate, so that the chrome-free tinplate can automatically adjust the contact area with the air in the surrounding food according to the weight of the food, so that the desiccant can be effectively utilized to the maximum extent, reducing the replacement of the desiccant by the staff, thereby improving the practical application effect of the present invention.

[0019] A surface treatment method for a chrome-free tinplate, which is applicable to the above-mentioned chrome-free tinplate, has the following steps:

[0020] S1: The staff performs tinning and soft melting operations on the steel plate to make a semi-finished tinplate, and then passivates the surface of the tinplate to form a passivation film of the tin layer of the tinplate, thereby enhancing the oxidation resistance and corrosion resistance of the tinplate surface;

[0021] S2: The staff selects the tinplate that has been passivated for preheating and laminating. During the laminating process, the molten material on the contact surface between the film and the tinplate must be cooled to keep the overall lamination stable.

[0022] S3: The staff cuts the bottom plate to be manufactured, digs out a rectangular groove No. 1 on the bottom plate, installs the rotating block, rotating rod and truncated table block in the circular groove in sequence, then connects the movable rod and the tension spring with the movable plate and installs them in the rectangular groove No. 1, and passes the other end of the movable rod through the bottom plate and connects it to the support block;

[0023] S4: The staff installs the air-permeable plate at the notch, then grooves the side of the bottom plate and installs the flap, and installs the limit rod on the side of the bottom plate close to the support block to complete the production of the chrome-free tinplate.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. A chrome-free tinplate in the present invention is pressed to the bottom plate by the weight of the food itself, and then cooperates with the movable plate to move in the opposite direction relative to the truncated cone block, so that when there is food in the food barrel, the desiccant is connected to the inside of the food barrel, thereby ensuring that the food is in a dry environment and improving the quality of the food after long-term storage; at the same time, the movable plate controls the connection size between the bottom of the food and the desiccant according to the gravity of the food, so that the desiccant can automatically adjust the contact area with the air in the food according to the weight of the food, so that the desiccant can be effectively utilized to the maximum extent, reducing the replacement of the desiccant by the staff, thereby improving the practical application effect of the present invention; at the same time, when the staff picks up the food barrel, the movable plate is no longer subjected to the force of the movable rod, and is driven by the tension spring to move the movable plate toward the bottom of the first rectangular groove. At this time, the space between the movable plate and the bottom of the first rectangular groove is reduced, so that the air at the desiccant moves to the side of the movable plate close to the air permeable plate; the air flow is increased, and the dryness of the inside of the food barrel is ensured; making the present invention more reasonable.

[0026] 2. A chrome-free tinplate in the present invention is provided with a flap on the side of the bottom plate, so that it is more convenient to fill the desiccant. The flap and the bottom plate are connected by a torsion spring, which makes it easier for the staff to close the flap, thereby improving the practicality of the present invention. At the same time, the interior of the truncated cone block is set to be hollow, which saves manufacturing costs and makes the production process simpler.

[0027] 3. The chrome-free tinplate in the present invention reduces the circulation of air between the movable plate and the bottom of the No. 1 rectangular groove and the outside air by arranging a cross section on the circular hole and arranging an inclined surface on the side of the flip cover away from the bottom of the No. 1 rectangular groove, so that when there is no food in the food barrel, the desiccant reduces the moisture absorbed by the outside air, thereby extending the service life of the desiccant and reducing the frequency of replacement of the desiccant by the staff, thereby making the present invention more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings.

[0029] Figure 1 is a cross-sectional view of a chrome-free tinplate in the present invention;

[0030] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0031] Figure 3 It is a left side view of the chrome-free tinplate in the present invention;

[0032] Figure 4 It is a flow chart of the surface treatment method of chrome-free tinplate in the present invention;

[0033] In the figure: 1. breathable plate; 2. bottom plate; 3. truncated cone block; 4. rectangular groove No. 1; 5. movable rod; 6. support block; 7. tension spring; 8. round hole; 9. movable plate; 10. rotating block; 11. rotating rod; 12. flip cover; 13. torsion spring; 14; limit rod; 15. rectangular groove No. 2. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] like Figures 1 to 4 As shown, the present invention proposes a chrome-free tinplate and a surface treatment method thereof, wherein the food is pressed to the bottom plate 2 by its own gravity, and then cooperates with the movable plate 9 to move in the opposite direction relative to the truncated cone block 3, so that in the food packaging box, the desiccant between the movable plate 9 and the bottom of the No. 1 rectangular groove 4 is connected to the inside of the food barrel, thereby ensuring that the food is in a dry environment and improving the quality of the food after long-term storage; at the same time, the movable plate 9 controls the connection size between the bottom of the food and the desiccant according to the gravity of the food, so that the desiccant can automatically adjust the contact area with the air in the food according to the weight of the food, so that the desiccant can be effectively utilized to the maximum extent, reducing the replacement of the desiccant, and further improving the practical application effect of the present invention.

[0036] The technical solution adopted by the present invention for its technical problem is: the chrome-free tinplate described in the present invention comprises a bottom plate 2; the bottom plate 2 is in the shape of a cuboid, and a rectangular groove 4 is arranged on the upper surface of the bottom plate 2; a breathable plate 1 is fixedly connected to the groove opening of the rectangular groove 4; a movable plate 9 is arranged on the side of the breathable plate 1 close to the groove bottom of the rectangular groove 4; the movable plate 9 is in sliding sealing connection with the groove wall of the rectangular groove 4, and a circular hole 8 is arranged on the movable plate 9; a truncated cone block 3 is arranged in the circular hole 8; the side of the truncated cone block 3 close to the groove bottom of the rectangular groove 4 is in close contact with the groove bottom of the rectangular groove 4; The truncated cone block 3 passes through the circular hole 8, and the diameter of the truncated cone block 3 on the side close to the air-permeable plate 1 is smaller than the diameter of the circular hole 8, and the diameter of the side away from the air-permeable plate 1 is larger than the diameter of the circular hole 8; the number of the truncated cone blocks 3 is at least two; the side of the movable plate 9 away from the air-permeable plate 1 is fixedly connected with a movable rod 5; the other end of the movable rod 5 passes through the bottom plate 2 and is fixedly connected with a support block 6; a tension spring 7 is sleeved on the movable rod 5; one end of the tension spring 7 is fixed to the movable plate 9, and the other end of the tension spring 7 is fixed to the inner wall of the bottom plate 2; the first rectangular groove 4 is filled with a desiccant; the desiccant is located between the movable plate 9 and the bottom of the first rectangular groove 4;

[0037] When working, in the field of food packaging, the chrome-free tinplate can only be used as a packaging material without any drying effect. Therefore, in the prior art, a desiccant is placed in the chrome-free tinplate to achieve the purpose of drying. However, the chrome-free tinplate with a desiccant cannot automatically control the drying effect according to the amount of packaged food, resulting in the limitation of the chrome-free tinplate as a packaging material.

[0038] Therefore, when using the present invention, the staff puts the desiccant between the movable plate 9 and the bottom of the first rectangular groove 4. At this time, the movable plate 9 is closely attached to the truncated cone block 3 under the action of the tension spring 7, and the truncated cone block 3 supports the movable plate 9 to limit the movable plate 9; a sealed environment is formed between the truncated cone block 3 and the movable plate 9; thereby, the desiccant no longer absorbs moisture from the outside air; food is put into the food barrel, and the food stays on the air-permeable plate 1, and the air-permeable plate 1 transmits the gravity of the food to the bottom plate 2, so that the bottom plate 2 is subjected to a downward force, and the bottom plate 2 moves downward, so that the truncated cone block 3 moves downward with the bottom plate 2; thereby, the movable plate 9 moves upward relative to the truncated cone block 3, and at this time, a gap appears between the circular hole 8 on the movable plate 9 and the truncated cone block 3, so that the side of the movable plate 9 close to the bottom of the first rectangular groove 4 is connected with the side of the movable plate 9 away from the first rectangular groove 4, and the desiccant can absorb moisture from the food inside the food barrel; under the action of the tension spring 7, the greater the gravity of the food, the larger the diameter of the gap between the movable plate 9 and the truncated cone block 3, and the greater the effect of the desiccant in absorbing moisture;

[0039] The present invention presses the food to the bottom plate 2 by its own gravity, and then cooperates with the movable plate 9 to move in the opposite direction relative to the truncated cone block 3, so that when there is food in the food barrel, the desiccant is connected to the inside of the food barrel, thereby ensuring that the food is in a dry environment and improving the quality of the food after long-term storage; at the same time, the movable plate 9 controls the connection size between the bottom of the food and the desiccant according to the gravity of the food, so that the desiccant can automatically adjust the contact area with the air in the food according to the weight of the food, so that the desiccant can be effectively utilized to the maximum extent, reducing the replacement of the desiccant by the staff, thereby improving the practical application effect of the present invention; at the same time, when the staff picks up the food barrel, the movable plate 9 is no longer subjected to the force of the movable rod 5, and the movable plate 9 is driven by the tension spring 7 to move to the bottom of the first rectangular groove 4. At this time, the space between the movable plate 9 and the bottom of the first rectangular groove 4 is reduced, so that the air at the desiccant moves to the side of the movable plate 9 close to the air permeable plate 1; the air flow is increased, and the dryness inside the food barrel is ensured; making the present invention more reasonable.

[0040] Preferably, a second rectangular groove 15 is provided on the side of the bottom plate 2; a flap 12 is provided at the notch of the second rectangular groove 15; the flap 12 is rotatably connected to the notch of the second rectangular groove 15 through a torsion spring 13; the size of the flap 12 is the same as that of the second rectangular groove 15; the interior of the truncated cone block 3 is hollow;

[0041] During operation, if the desiccant is not replaced for a long time, the desiccant absorbs too much moisture, causing the desiccant to become ineffective, and the desiccant needs to be replaced. At this time, the staff opens the flap 12 and fills the desiccant between the movable plate 9 and the bottom of the No. 1 rectangular groove 4. After the filling is completed, the flap 12 automatically resets under the action of the torsion spring 13; the interior of the truncated cone is set to be hollow, which saves material and reduces weight; the present invention arranges the flap 12 on the side of the bottom plate 2, so that it is more convenient to fill the desiccant, and the flap 12 is connected to the bottom plate 2 by the torsion spring 13, so that the staff can close the flap 12 more easily, thereby improving the practicality of the present invention. At the same time, the interior of the truncated cone block 3 is set to be hollow, which saves material costs and reduces transportation costs.

[0042] Preferably, the hole wall of the circular hole 8 is inclined, and the hole wall of the circular hole 8 is in contact with the outer wall of the truncated cone block 3; a side of the flip cover 12 close to the bottom of the first rectangular groove 4 is provided with an inclined surface; a bevel is provided at the connection between the bottom plate 2 and the flip cover 12; the inclined surface of the bottom of the first rectangular groove 4 of the flip cover 12 is in contact with the inclined surface at the connection between the bottom plate 2 and the flip cover 12;

[0043] During operation, when there is no food in the food barrel, the movable plate 9 moves to a position close to the bottom of the No. 1 rectangular groove 4, and moves to the truncated cone block 3 to support the movable plate 9. At this time, the hole wall of the circular hole 8 fits with the outer wall of the truncated cone block 3, so that the air in the movable plate 9 close to the air-permeable plate 1 and the air in the movable plate 9 away from the air-permeable plate 1 no longer flow, and at the same time, the inclined surface of the bottom of the groove of the No. 1 rectangular groove 4 of the flip cover 12 fits with the inclined surface at the connection between the bottom plate 2 and the flip cover 12, thereby reducing the external air from entering between the movable plate 9 and the bottom of the No. 1 rectangular groove 4; the present invention reduces the circulation of air between the movable plate 9 and the bottom of the No. 1 rectangular groove 4 and the external air by fitting the hole wall of the circular hole 8 with the outer wall of the truncated cone block 3, so that when there is no food in the food barrel, the desiccant reduces the absorption of moisture in the external air, thereby extending the service life of the desiccant, reducing the frequency of replacement of the desiccant by the staff, and making the present invention more practical.

[0044] Preferably, the center of the first rectangular groove 4 is rotatably connected to a rotating block 10; the outer wall of the rotating block 10 is evenly fixedly connected to a rotating rod 11; the other end of the rotating rod 11 is fixedly connected to the corresponding truncated cone block 3;

[0045] During operation, when the desiccant fails, it is necessary to replace the desiccant. The staff presses the support block 6 to move the movable plate 9 to the farthest distance from the bottom of the No. 1 rectangular groove 4. At this time, the flap 12 is opened to take out the failed desiccant between the two adjacent truncated cone blocks 3 near the flap 12, and then the truncated cone block 3 is rotated. The truncated cone block 3 moves in an arc under the action of the rotating rod 11, and the failed desiccant far away from the flap 12 is rotated to the position close to the flap 12, and this process is repeated until all the failed desiccant is taken out; then, the staff fills the unused desiccant, first filling the unused desiccant between the two adjacent truncated cone blocks 3 near the flap 12. After the desiccant is filled, the truncated cone block 3 is rotated to fill the truncated cone block 3 in the other direction, and this process is repeated until the desiccant is filled in each direction; then, the truncated cone block 3 is rotated to the corresponding position of the circular hole 8, and the flap 12 is closed at this time, and the staff stops pressing the support block 6, so that the movable plate 9 returns to the initial position;

[0046] The present invention arranges a rotating rod 11 between the truncated cone blocks 3 and arranges a rotating block 10 in the middle of the rotating rod 11. When taking out the failed desiccant, the failed desiccant is prevented from being adhered to the bottom of the No. 1 rectangular groove 4 and cannot be taken out, so that the process of taking out the failed desiccant is simpler; when filling new desiccant, the filling is made more uniform, so that the filling amount is larger; therefore, the present invention has the characteristics of strong practicality and high working efficiency.

[0047] Preferably, a limit rod 14 is hinged on one side of the bottom plate 2 close to the support block 6; the length of the limit rod 14 is equal to the length of the movable rod 5 exposed from the bottom plate 2; during operation, when there is no food in the food barrel, the movable plate 9 is fitted between the truncated cone block 3, and the limit rod 14 is rotated to the support block 6 to limit the movement of the support block 6, so that the position of the movable plate 9 is limited; the support block 6 is prevented from being subjected to external force so that a gap appears between the movable plate 9 and the truncated cone block 3, thereby accelerating the failure of the desiccant; the present invention locks the position of the movable plate 9 by hingedly connecting the limit rod 14 on one side of the bottom plate 2 close to the support block 6, so that the desiccant is in a sealed state, thereby further extending the service life of the desiccant, and making the present invention more reasonable.

[0048] The present invention mainly aims at combining and splicing chrome-free tinplates into a special chrome-free tinplate, so that the chrome-free tinplate can automatically adjust the contact area with the air in the surrounding food according to the weight of the food, so that the desiccant can be effectively utilized to the maximum extent, reducing the replacement of the desiccant by the staff, thereby improving the practical application effect of the present invention.

[0049] A surface treatment method for a chrome-free tinplate, which is applicable to the above-mentioned chrome-free tinplate, has the following steps:

[0050] S1: The staff performs tinning and soft melting operations on the steel plate to make a semi-finished tinplate, and then passivates the surface of the tinplate to form a passivation film of the tin layer of the tinplate, thereby enhancing the oxidation resistance and corrosion resistance of the tinplate surface;

[0051] S2: The staff selects the tinplate that has been passivated for preheating and laminating. During the laminating process, the molten material on the contact surface between the film and the tinplate must be cooled to keep the overall lamination stable.

[0052] S3: The staff cuts the bottom plate 2 to be manufactured, digs out a rectangular groove 4 on the bottom plate 2, installs the rotating block 10, the rotating rod 11 and the truncated cone block 3 in the circular groove in sequence, and then connects the movable rod 5 and the tension spring 7 with the movable plate 9 and installs them in the rectangular groove 4, and passes the other end of the movable rod 5 through the bottom plate 2 and connects it to the support block 6;

[0053] S4: The staff installs the air-permeable plate 1 at the notch, then grooves the side of the bottom plate 2 and installs the flip cover 12, and installs the limit rod 14 on the side of the bottom plate 2 close to the support block 6, completing the production of the chrome-free tinplate.

[0054] The specific workflow is as follows:

[0055] Put desiccant between the movable plate 9 and the bottom of the first rectangular groove 4. At this time, the movable plate 9 is pressed against the truncated cone block 3 under the action of the tension spring 7, and the truncated cone block 3 supports the movable plate 9 to limit the movable plate 9; a sealed environment is formed between the truncated cone block 3 and the movable plate 9; thereby, the desiccant no longer absorbs moisture from the outside air; put food into the food barrel, the food stays on the air-permeable plate 1, and the air-permeable plate 1 transmits the gravity of the food to the bottom plate 2, so that the bottom plate 2 is subjected to a downward force, and the bottom plate 2 moves downward, so that the truncated cone block 3 moves downward with the bottom plate 2; thereby, the movable plate 9 moves upward relative to the truncated cone block 3, and at this time, a gap appears between the circular hole 8 on the movable plate 9 and the truncated cone block 3, so that the movable plate 9 is close to the first rectangular groove 4. One side of the bottom of the groove 4 is connected to the side of the movable plate 9 away from the first rectangular groove 4, and the desiccant can absorb moisture from the food inside the food barrel; under the action of the tension spring 7, the greater the gravity of the food, the larger the diameter of the gap between the movable plate 9 and the truncated cone block 3, and the greater the effect of the desiccant in absorbing moisture; when the desiccant is not replaced for a long time, the desiccant absorbs too much moisture, causing the desiccant to fail, and thus the desiccant needs to be replaced. At this time, the staff opens the flip cover 12 and fills the desiccant between the movable plate 9 and the bottom of the first rectangular groove 4. After the filling is completed, the flip cover 12 automatically resets under the action of the torsion spring 13; the interior of the truncated cone is set to be hollow, which saves material consumption and reduces weight; when there is no food in the food barrel When the desiccant is invalid, the desiccant needs to be replaced. The staff presses the support block 6 to move the movable plate 9 to the farthest distance from the bottom of the rectangular groove 4. At this time, the wall of the circular hole 8 fits with the outer wall of the truncated cone block 3, so that the air in the movable plate 9 close to the air-permeable plate 1 and the air in the movable plate 9 away from the air-permeable plate 1 no longer flow. At the same time, the inclined surface of the flip cover 12 close to the bottom of the rectangular groove 4 is matched with the inclined surface of the connection between the bottom plate 2 and the flip cover 12, which reduces the entry of external air between the movable plate 9 and the bottom of the rectangular groove 4. When the desiccant fails, it needs to be replaced. The staff presses the support block 6 to move the movable plate 9 to the farthest distance from the bottom of the rectangular groove 4. At this time, the flip cover 12 is opened and the flap 12 close to the flip cover 12 is taken out. The desiccant that has failed between two adjacent truncated cone blocks 3 is taken out, and then the truncated cone block 3 is rotated. The truncated cone block 3 moves in an arc under the action of the rotating rod 11, and the desiccant that has failed far away from the flip cover 12 is rotated to the position close to the flip cover 12, and this process is repeated until all the failed desiccant is taken out; then, the staff fills the unused desiccant, and first fills the unused desiccant between two adjacent truncated cone blocks 3 close to the flip cover 12. After the desiccant is filled, the truncated cone block 3 is rotated to fill the truncated cone block 3 in the other direction, and this process is repeated until the desiccant is filled in each direction; then, the truncated cone block 3 is rotated to the corresponding position of the circular hole 8, and at this time, the flip cover 12 is closed, and the staff stops pressing the support block 6, so that the movable plate 9 returns to the initial position;When there is no food in the food barrel, the movable plate 9 fits against the truncated cone block 3. At this time, the limit rod 14 is rotated to the support block 6 to limit the movement of the support block 6, so that the position of the movable plate 9 is limited; this prevents the support block 6 from being subjected to external force, causing a gap between the movable plate 9 and the truncated cone block 3, and accelerating the failure of the desiccant. ;

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A chrome-free tinplate, comprising a bottom plate (2), characterized in that: The bottom plate (2) is in the shape of a rectangular parallelepiped, and a rectangular groove (4) is provided on the upper surface of the bottom plate (2); a breathable plate (1) is fixedly connected to the groove opening of the rectangular groove (4); a movable plate (9) is provided on the side of the breathable plate (1) close to the groove bottom of the rectangular groove (4); the movable plate (9) is slidably sealedly connected to the groove wall of the rectangular groove (4), and a circular hole (8) is provided on the movable plate (9); a truncated cone block (3) is provided in the circular hole (8); a side of the truncated cone block (3) close to the groove bottom of the rectangular groove (4) is tightly attached to the groove bottom of the rectangular groove (4); the truncated cone block (3) passes through the circular hole (8), and the truncated cone block (3) close to the groove bottom of the rectangular groove (4) is provided with a circular hole (8); a side of the truncated cone block (3) close to the groove bottom of the rectangular groove (4) is tightly attached to the groove bottom of the rectangular groove (4); the truncated cone block (3) passes through the circular hole (8), and the truncated cone block (3) close to the breathable The diameter of one side of the plate (1) is smaller than the diameter of the circular hole (8), and the diameter of the side away from the air-permeable plate (1) is larger than the diameter of the circular hole (8); the number of the truncated cone blocks (3) is at least two; the side of the movable plate (9) away from the air-permeable plate (1) is fixedly connected to a movable rod (5); the other end of the movable rod (5) passes through the bottom plate (2) and is fixedly connected to a support block (6); a tension spring (7) is sleeved on the movable rod (5); one end of the tension spring (7) is fixed to the movable plate (9), and the other end of the tension spring (7) is fixed to the inner wall of the bottom plate (2); a desiccant is provided in the first rectangular groove (4); the desiccant is located between the movable plate (9) and the bottom of the first rectangular groove (4); A second rectangular groove (15) is provided on the side of the bottom plate (2); a flap (12) is provided at the notch of the second rectangular groove (15); the flap (12) is rotatably connected to the notch of the second rectangular groove (15) via a torsion spring (13); the size of the flap (12) is the same as that of the second rectangular groove (15); the interior of the truncated cone block (3) is hollow; The hole wall of the circular hole (8) is arranged to be inclined, and the hole wall of the circular hole (8) is in contact with the outer wall of the truncated cone block (3); the truncated cone block (3) supports the movable plate (9) to limit the movable plate (9); a sealed environment is formed between the truncated cone block (3) and the movable plate (9); a slope is arranged on one side of the flip cover (12) close to the bottom of the first rectangular groove (4); a slope is arranged at the connection between the bottom plate (2) and the flip cover (12); the slope of the flip cover (12) close to the bottom of the first rectangular groove (4) is in contact with the slope at the connection between the bottom plate (2) and the flip cover (12); The center of the first rectangular groove (4) is rotatably connected to a rotating block (10); the outer wall of the rotating block (10) is evenly fixedly connected to a rotating rod (11); the other end of the rotating rod (11) is fixedly connected to a corresponding truncated cone block (3); A limit rod (14) is hingedly connected to one side of the bottom plate (2) close to the support block (6); the length of the limit rod (14) is equal to the length of the movable rod (5) protruding from the bottom plate (2).

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