Automatic sewage flocculant feeding device

By designing a sewage flocculant automatic dispensing device including a support seat, a drop box, an extrusion mechanism and a lifting and rotating mechanism, the problem of solid flocculant agglomeration affecting sewage treatment efficiency is solved, and the dispersion of flocculant and the improvement of sewage treatment efficiency is achieved.

CN222989873UActive Publication Date: 2025-06-17SHANXI QINGYUAN ENVIRONMENTAL ENG TECH CONSULTING CO LTD
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Patent Information

Application Number
CN202421601373.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-08
Publication Date
2025-06-17
Estimated Expiration
2034-07-08

AI Technical Summary

Technical Problem

Solid flocculants are prone to agglomeration and are directly put into sewage and do not have sufficient contact with sewage, which affects the sewage treatment efficiency.

Method used

An automatic delivery device for sewage flocculant is designed, including a support seat, a delivery box, an extrusion mechanism and a lifting and rotating mechanism, and provides power through a drive to realize the extrusion and dispersion of the flocculant.

Benefits of technology

Effectively avoid flocculant falling into pieces, realize dispersed flocculant release, improve the efficiency and quality of sewage treatment, and accelerate the delivery of flocculant.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of sewage treatment, and discloses an automatic sewage flocculant feeding device which comprises a supporting seat, a movable frame is mounted at the bottom end of the supporting seat, a through hole is formed in the middle of the supporting seat, a feeding box is arranged above the supporting seat, feeding holes are formed in the feeding box at equal intervals, and the feeding holes are communicated with the through hole. The bottom end of the throwing box is fixedly connected with a shielding plate penetrating through the interior of the through opening, the supporting base is connected with the throwing box through a telescopic piece, an extrusion mechanism is installed above the throwing box, and a lifting rotating mechanism connected with the supporting base is arranged on the throwing box; according to the device, the extruding mechanism can conveniently enter the feeding box to extrude a flocculating agent, the blocky flocculating agent can be conveniently extruded, crushed and scattered, the blocky falling of the flocculating agent is effectively avoided, meanwhile, the flocculating agent falls through a plurality of feeding holes, the dispersive feeding of the flocculating agent can be realized, the concentrated falling of the flocculating agent can be avoided, and the production efficiency is improved. Therefore, the sewage treatment efficiency and the sewage treatment quality are effectively improved.
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Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to an automatic sewage flocculant dosing device. Background Art

[0002] Sewage refers to water discharged from life and production that has been polluted to a certain extent. When treating this sewage, people generally collect the sewage in a sewage tank and then put the flocculant for treating the sewage into the sewage tank. Flocculants can be generally divided into two categories: inorganic flocculants and organic flocculants according to their chemical compositions. Therefore, during the process of sewage treatment by dosing flocculants, dosing equipment for flocculants will be used.

[0003] At the same time, some flocculants are solid, and the solid flocculants will also agglomerate. If the agglomerated flocculants are directly put into the sewage, it will cause insufficient contact with the sewage, thereby affecting the sewage treatment efficiency. Summary of the Utility Model

[0004] To solve the technical problem that some flocculants are solid and the solid flocculants will also agglomerate. If the agglomerated flocculants are directly put into the sewage, it will cause insufficient contact with the sewage, thereby affecting the sewage treatment efficiency, the utility model provides an automatic sewage flocculant dosing device.

[0005] The utility model is realized by adopting the following technical scheme: an automatic sewage flocculant dosing device, including a support base, a moving frame is installed at the bottom end of the support base, a through hole is opened at the middle position of the support base, a dosing box is arranged above the support base, dosing holes are equidistantly opened on the dosing box, a baffle plate is fixedly connected to the bottom end of the dosing box and penetrates through the inside of the through hole, the support base and the dosing box are connected by a telescopic member, an extrusion mechanism is installed above the dosing box, a lifting and rotating mechanism for connecting with the support base is arranged on the dosing box, and the extrusion mechanism and the lifting and rotating mechanism are connected by a driver.

[0006] As a further improvement of the above scheme, the driver includes a motor two fixedly connected to one side of the dosing box, the output shaft of the motor two is connected with a bevel gear one, a cam and a gear three. The cam is located between the gear three and the bevel gear one, and the bevel gear one is close to the motor two. A roller is installed on the outer wall of the long end of the cam, the roller is in movable contact with the top surface of the support base, the gear three is connected with the extrusion mechanism, and the bevel gear one is connected with the lifting and rotating mechanism.

[0007] As a further improvement of the above solution, the extrusion mechanism includes stabilizing rods fixedly connected to the top end of the feeding box and symmetrically arranged. A pressing plate is provided above the feeding box. Fixing rods are symmetrically installed at the top end of the pressing plate and slidably sleeved outside the stabilizing rods. One end of one of the fixing rods is fixedly connected to a toothed plate meshing with the third gear. A groove is formed at the bottom end of the pressing plate. Insertion rods adapted to the feeding holes are equidistantly installed on the inner wall of the groove. A cleaning unit slidably connected to the insertion rods is provided on the pressing plate.

[0008] As a further improvement of the above solution, the cleaning unit includes a push plate installed inside the groove. Cleaning rings slidably sleeved outside the insertion rods are equidistantly installed on the push plate. A through hole is formed at the middle position of the top end of the pressing plate. A first motor is installed at the top end of the pressing plate. The output shaft of the first motor is connected to a second gear. An internally threaded cylinder is rotatably installed above the pressing plate. A first gear meshing with the second gear is sleeved outside the internally threaded cylinder. A T-shaped threaded rod passing through the through hole and fixedly connected to the top end of the push plate is threadedly installed inside the internally threaded cylinder. Clamping blocks are symmetrically installed on the inner wall of the through hole. Clamping grooves slidably connected to the clamping blocks are formed on both sides of the T-shaped threaded rod. Both the clamping blocks and the clamping grooves are rectangular structures.

[0009] As a further improvement of the above solution, the lifting and rotating mechanism includes a fixed cylinder fixedly connected to the top end of the support base and sleeved outside the support rod and the shielding plate. A lifting cylinder is inserted inside the fixed cylinder. The fixed cylinder and the lifting cylinder are connected by a second spring. A second bevel gear sleeved outside the feeding box is fixedly connected to the top end of the lifting cylinder. The first bevel gear meshes with the second bevel gear. A slideway is formed on the outer wall of the lifting cylinder. A connecting rod connected to the output shaft of the second motor is slidably installed inside the slideway.

[0010] As a further improvement of the above solution, the telescopic member includes telescopic grooves symmetrically formed at the bottom end of the feeding box. A support rod is inserted inside the telescopic groove. The support rod and the telescopic groove are connected by a first spring. A T-shaped block is fixedly connected to the bottom end of the support rod. An annular groove slidably connected to the T-shaped block is formed at the top end of the support base.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The utility model is designed with a driver, which is convenient for providing power to the extrusion mechanism and the lifting and rotating mechanism, facilitating the entry of the extrusion mechanism into the interior of the dosing box, realizing the extrusion of the flocculant, facilitating the extrusion and fragmentation of the agglomerated flocculant for dispersion, effectively avoiding the falling of the agglomerated flocculant. At the same time, the flocculant falls through multiple dosing holes, which can realize the dispersed dosing of the flocculant, avoid the concentrated falling of the flocculant, and thus effectively improve the treatment efficiency and quality of sewage. Meanwhile, during the rotation of the cam, the roller at the long end of the cam will reciprocally contact the top of the support seat, and under the action of the telescopic member, the dosing box will reciprocally lift and vibrate, thereby accelerating the dosing efficiency of the dosing box for the flocculant. At the same time, through the design of the lifting and rotating mechanism, it is convenient to rotate during the lifting of the dosing box, causing the dosing box to drive the flocculant inside it to shake, facilitating the change of the position of the flocculant, and thus providing convenience for the dispersed feeding of the flocculant, and effectively improving the dosing speed of the flocculant. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the automatic sewage flocculant dosing device;

[0014] Figure 2 is Figure 1 The enlarged structural diagram at position A in

[0015] Figure 3 is Figure 1 The connection diagram of the dosing box and the driver in

[0016] Main Symbol Explanation:

[0017] Support seat; 2. Moving frame; 3. Through hole; 4. Dosing box; 5. Dosing hole; 6. Baffle; 7. Support rod; 8. Telescopic groove; 9. Spring 1; 10. Pressure plate; 11. Groove; 12. Plug rod; 13. Push plate; 14. Cleaning ring; 15. Through hole; 16. Internal thread cylinder; 17. Gear 1; 18. T-shaped threaded rod; 19. Block; 20. Card slot; 21. Motor 1; 22. Gear 2; 23. Motor 2; 24. Bevel gear 1; 25. Cam; 26. Gear 3; 27. Stabilizing rod; 28. Fixed rod; 29. Tooth plate; 30. Bevel gear 2; 31. Connecting rod; 32. Slideway; 33. Fixed cylinder; 34. Lifting cylinder; 35. Spring 2. Detailed Embodiment

[0018] Next, in combination with the drawings and specific embodiments, the present utility model will be further described. It should be noted that on the premise of no conflict, the following described embodiments or technical features can be arbitrarily combined with each other to form new embodiments.

[0019] Please combine Figures 1 to 3The present embodiment is an automatic sewage flocculant delivery device, comprising a support base 1, a movable frame 2 is installed at the bottom end of the support base 1, a through opening 3 is opened in the middle position of the support base 1, a delivery box 4 is provided above the support base 1, delivery holes 5 are opened at equal intervals on the delivery box 4, a shielding plate 6 penetrating through the inside of the through opening 3 is fixed to the bottom end of the delivery box 4, the support base 1 and the delivery box 4 are connected by a telescopic member, an extrusion mechanism is installed above the delivery box 4, a lifting and rotating mechanism connected to the support base 1 is provided on the delivery box 4, and the extrusion mechanism and the lifting and rotating mechanism are connected by a driver.

[0020] The driver includes a motor 23 fixed to one side of the delivery box 4, the output shaft of the motor 23 is connected with a bevel gear 1 24, a cam 25 and a gear 3 26, the cam 25 is located between the gear 3 26 and the bevel gear 1 24, and the bevel gear 1 24 is arranged close to the motor 23, a roller is installed on the outer wall of the long end of the cam 25, the roller is in active contact with the top surface of the support seat 1, the gear 3 26 is connected with the extrusion mechanism, and the bevel gear 1 24 is connected with the lifting and rotating mechanism;

[0021] The staff moves the device to the top of the sewage tank so that the shielding plate 6 is located directly above the sewage tank, and then puts the flocculant into the delivery box 4, and starts the motor 23. The motor 23 drives the bevel gear 1 24, the cam 25 and the gear 3 26 to rotate synchronously, which is convenient for providing power for the extrusion mechanism and the lifting and rotating mechanism. The extrusion mechanism enters the interior of the delivery box 4 to squeeze the flocculant, which is convenient for squeezing and breaking up the agglomerated flocculant. At the same time, the flocculant falls through the multiple delivery holes 5, which can realize the dispersed delivery of the flocculant, avoid the concentrated falling of the flocculant and improve the treatment quality of the sewage. At the same time, the cam 25 rotates During the process, the roller at the long end of the cam 25 will be driven to contact the top of the support seat 1, thereby realizing the upward movement of the delivery box 4. Then, as the cam 25 continues to rotate, the roller will be driven to break away from the contact with the support seat 1. Under the action of the telescopic member, the delivery box 4 will be able to reciprocate and lift and shake, thereby accelerating the delivery efficiency of the flocculant by the delivery box 4. At the same time, through the design of the lifting and rotating mechanism, the delivery box 4 can be rotated during the lifting process, so that the delivery box 4 can drive the flocculant inside it to shake, which is convenient for changing the position of the flocculant, thereby facilitating the dispersed feeding of the flocculant and improving the delivery speed of the flocculant.

[0022] The squeezing mechanism includes a stabilizing rod 27 fixedly connected to the top of the delivery box 4 and symmetrically arranged, a pressing plate 10 is arranged above the delivery box 4, and a fixing rod 28 slidably sleeved on the outside of the stabilizing rod 27 is symmetrically installed on the top of the pressing plate 10, one end of one of the fixing rods 28 is fixedly connected to a tooth plate 29 meshingly connected with the gear three 26, a groove 11 is opened at the bottom end of the pressing plate 10, and an insertion rod 12 adapted to the delivery hole 5 is equidistantly installed on the inner wall of the groove 11, and a cleaning unit slidably connected to the insertion rod 12 is arranged on the pressing plate 10;

[0023] When the second motor 23 drives the third gear 26 to rotate, due to the meshing connection relationship between the third gear 26 and the toothed plate 29, the toothed plate 29 will move downward. The toothed plate 29 will drive the fixed rod 28 to slide downward on the stabilizing rod 27. The fixed rod 28 drives the pressing plate 10 to move downward, and the pressing plate 10 drives the insertion rod 12 to move downward synchronously. Furthermore, the pressing plate 10 drives the pushing plate 13 to move into the inside of the dosing box 4, so that the pressing plate 10 and the pushing plate 13 extrude the flocculant inside the dosing box 4, and thus the agglomerated flocculant can be broken. And during the feeding process, in order to prevent the flocculant from blocking the dosing hole 5, when the pressing plate 10 moves downward, it will drive the insertion rod 12 to insert into the inside of the dosing hole 5, realizing the cleaning of the dosing hole 5, effectively preventing the dosing hole 5 from being blocked and affecting the feeding speed of the flocculant, and thus accelerating the progress of the flocculant feeding.

[0024] The cleaning unit includes a pushing plate 13 installed inside the groove 11. Cleaning rings 14 are equidistantly installed on the pushing plate 13 and are slidably sleeved outside the insertion rod 12. A through hole 15 is opened at the middle position of the top end of the pressing plate 10. A first motor 21 is installed at the top end of the pressing plate 10. The output shaft of the first motor 21 is connected to a second gear 22. An internally threaded cylinder 16 is rotatably installed above the pressing plate 10. A first gear 17 meshingly connected to the second gear 22 is sleeved outside the internally threaded cylinder 16. A T-shaped threaded rod 18 passing through the inside of the through hole 15 and fixedly connected to the top end of the pushing plate 13 is threadedly installed inside the internally threaded cylinder 16. Clamping blocks 19 are symmetrically installed on the inner wall of the through hole 15. Card slots 20 for sliding connection with the clamping blocks 19 are opened on both sides of the T-shaped threaded rod 18. The clamping blocks 19 and the card slots 20 are both rectangular structures;

[0025] After the insertion rod 12 inserts into the dosing hole 5 to clean the flocculant inside it, when the insertion rod 12 disengages from the dosing hole 5, there is a phenomenon that part of the flocculant adheres to the outer wall of the insertion rod 12. Then start the first motor 21. The first motor 21 drives the second gear 22 to rotate. Due to the meshing connection relationship between the second gear 22 and the first gear 17, the first gear 17 will rotate. The first gear 17 will drive the internally threaded cylinder 16 to rotate. Through the threaded connection relationship between the internally threaded cylinder 16 and the T-shaped threaded rod 18 and the sliding connection relationship between the clamping blocks 19 and the card slots 20, the T-shaped threaded rod 18 will move downward. The T-shaped threaded rod 18 will push the pushing plate 13 to move downward. The pushing plate 13 will drive the cleaning ring 14 to move downward, so that the cleaning ring 14 slides on the outer wall of the insertion rod 12, facilitating the cleaning ring 14 to scrape and clean the flocculant adhering to the outer wall of the insertion rod 12, and thus providing convenience for the flocculant feeding.

[0026] The lifting and rotating mechanism includes a fixed cylinder 33 fixedly connected to the top of the support base 1 and sleeved outside the support rod 7 and the baffle 6. A lifting cylinder 34 is inserted inside the fixed cylinder 33. The fixed cylinder 33 and the lifting cylinder 34 are connected by a second spring 35. The top of the lifting cylinder 34 is fixedly connected with a second bevel gear 30 sleeved outside the dosing box 4. The first bevel gear 24 is meshed with the second bevel gear 30. A slideway 32 is opened on the outer wall of the lifting cylinder 34. Inside the slideway 32, a connecting rod 31 connected to the output shaft of the second motor 23 is slidably installed. The telescopic member includes telescopic grooves 8 symmetrically opened at the bottom end of the dosing box 4. A support rod 7 is inserted inside the telescopic groove 8. The support rod 7 and the telescopic groove 8 are connected by a first spring 9. The bottom end of the support rod 7 is fixedly connected with a T-shaped block. An annular groove slidably connected with the T-shaped block is opened at the top of the support base 1. It should be noted here that the vertical cross-sections of the T-shaped block, the annular groove and the slideway 32 are all T-shaped structures, and a ball is embedded at the bottom end of the T-shaped block, which can reduce the friction force;

[0027] When the second motor 23 works, it will drive the first bevel gear 24 to rotate. Due to the meshing connection relationship between the first bevel gear 24 and the second bevel gear 30, and due to the fixing effect of the second bevel gear 30, the first bevel gear 24 will move on the second bevel gear 30, and then the dosing box 4 will rotate. At the same time, the connecting rod 31 will rotate inside the slideway 32. During the rotation of the dosing box 4, it also reciprocally contacts the support base 1 through the cam 25, which is convenient for the lifting cylinder 34 to slide up and down inside the fixed cylinder 33, so that the second spring 35 can generate elastic force, and the reciprocating lifting and shaking of the dosing box 4 can be realized, which can accelerate the shaking of the flocculant and change the position of the flocculant, and then effectively improve the efficiency of the flocculant dosing.

[0028] In the embodiment of the present application, the implementation principle of an automatic sewage flocculant dosing device is as follows: The staff moves the device above the sewage tank, so that the baffle 6 is directly above the sewage tank. Then, the flocculant is put into the dosing box 4, and the second motor 23 is started. The second motor 23 drives the first bevel gear 24, the cam 25 and the third gear 26 to rotate synchronously. Due to the meshing connection relationship between the third gear 26 and the toothed plate 29, the toothed plate 29 will move downward. The toothed plate 29 will drive the fixed rod 28 to slide downward on the stabilizing rod 27. The fixed rod 28 drives the pressing plate 10 to move downward. The pressing plate 10 will drive the insertion rod 12 to move downward synchronously. Then, the pressing plate 10 drives the pushing plate 13 to move into the dosing box 4, so that the pressing plate 10 and the pushing plate 13 squeeze the flocculant inside the dosing box 4, and then the lumped flocculant can be crushed. And during the feeding process, in order to prevent the flocculant from blocking the dosing hole 5, the insertion rod 12 will be driven by the pressing plate 10 to insert into the dosing hole 5 during the downward movement of the pressing plate 10, so as to clean the dosing hole 5, effectively preventing the dosing hole 5 from being blocked and affecting the dosing speed of the flocculant, and then accelerating the progress of the flocculant dosing;

[0029] After the insertion rod 12 is inserted into the feeding hole 5 to clean the flocculant inside it, when the insertion rod 12 is separated from the feeding hole 5, there is a phenomenon that part of the flocculant adheres to the outer wall of the insertion rod 12. Then, the first motor 21 is started, and the first motor 21 drives the second gear 22 to rotate. Through the meshing connection relationship between the second gear 22 and the first gear 17, the first gear 17 will rotate. The first gear 17 will drive the internal thread cylinder 16 to rotate. Through the threaded connection relationship between the internal thread cylinder 16 and the T-shaped threaded rod 18 and the sliding connection relationship between the matching block 19 and the card slot 20, the T-shaped threaded rod 18 will move downward. The T-shaped threaded rod 18 will push the push plate 13 downward. The push plate 13 will drive the cleaning ring 14 downward, so that the cleaning ring 14 slides on the outer wall of the insertion rod 12, which is convenient for the cleaning ring 14 to scrape and clean the flocculant attached to the outer wall of the insertion rod 12, thus facilitating the feeding of the flocculant.

[0030] When the second motor 23 works, it will drive the first bevel gear 24 to rotate. Through the meshing connection relationship between the first bevel gear 24 and the second bevel gear 30, and due to the fixing effect of the second bevel gear 30, the first bevel gear 24 will move on the second bevel gear 30. Furthermore, the feeding box 4 will rotate, and at the same time, the connecting rod 31 will rotate inside the slideway 32. During the rotation of the feeding box 4, through the reciprocating contact between the cam 25 and the support seat 1, it is convenient for the lifting cylinder 34 to slide up and down inside the fixed cylinder 33, so that the second spring 35 can generate elastic force, and the reciprocating lifting and shaking of the feeding box 4 can be realized, which can accelerate the shaking of the flocculant and change the position of the flocculant. Therefore, the efficiency of the flocculant feeding is effectively improved.

[0031] The above embodiments are only the preferred embodiments of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the protection scope required by the present invention.

Claims

1. A sewage flocculant automatic dosing device, characterized in that: It includes a support seat, a mobile frame is installed at the bottom of the support seat, a through opening is opened in the middle of the support seat, a delivery box is arranged above the support seat, delivery holes are opened at equal distances on the delivery box, a shielding plate running through the inside of the through opening is fixedly connected to the bottom of the delivery box, the support seat and the delivery box are connected by a telescopic piece, an extrusion mechanism is installed above the delivery box, a lifting and rotating mechanism connected to the support seat is arranged on the delivery box, and the extrusion mechanism and the lifting and rotating mechanism are connected by a driver.

2. The automatic sewage flocculant delivery device according to claim 1, characterized in that: The driver includes a motor 2 fixedly connected to one side of the delivery box, the output shaft of the motor 2 is connected with a bevel gear 1, a cam and a gear 3, the cam is located between the gear 3 and the bevel gear 1, and the bevel gear 1 is arranged close to the motor 2, a roller is installed on the outer wall of the long end of the cam, the roller is in active contact with the top surface of the support seat, the gear 3 is connected with the extrusion mechanism, and the bevel gear 1 is connected with the lifting and rotating mechanism.

3. The automatic sewage flocculant delivery device according to claim 1, characterized in that: The squeezing mechanism includes a stabilizing rod fixedly connected to the top of the delivery box and symmetrically arranged, a pressure plate is provided above the delivery box, and a fixing rod slidably sleeved on the outside of the stabilizing rod is symmetrically installed on the top of the pressure plate, one end of one of the fixing rods is fixedly connected to a toothed plate that is three-meshingly connected to the gear, a groove is provided at the bottom end of the pressure plate, and plug rods that are compatible with the delivery holes are installed at equal distances on the inner wall of the groove, and a cleaning unit that is slidably connected to the plug rod is provided on the pressure plate.

4. The automatic sewage flocculant delivery device according to claim 3, characterized in that: The cleaning unit includes a push plate installed inside the groove, a cleaning ring slidably sleeved on the outside of the insertion rod is equidistantly installed on the push plate, a through hole is opened in the middle position of the top of the pressure plate, a motor 1 is installed on the top of the pressure plate, and a gear 2 is connected to the output shaft of the motor 1, an internal threaded cylinder is rotatably installed above the pressure plate, and a gear 1 meshing with the gear 2 is sleeved on the outside of the internal threaded cylinder, a T-shaped threaded rod that passes through the inside of the through hole and is fixedly connected to the top of the push plate is installed on the internal thread of the internal threaded cylinder, and a clamping block is symmetrically installed on the inner wall of the through hole, and a clamping groove slidably connected to the clamping block is opened on both sides of the T-shaped threaded rod, and the clamping block and the clamping groove are both rectangular structures.

5. The automatic sewage flocculant delivery device according to claim 1, characterized in that: The lifting and rotating mechanism includes a fixed cylinder fixedly connected to the top of the support seat and sleeved on the outside of the support rod and the baffle plate, a lifting cylinder is inserted into the interior of the fixed cylinder, the fixed cylinder and the lifting cylinder are connected by spring 2, a bevel gear 2 sleeved on the outside of the delivery box is fixed to the top of the lifting cylinder, bevel gear 1 is meshed with bevel gear 2, a slide is provided on the outer wall of the lifting cylinder, and a connecting rod connected to the output shaft of the second motor is slidably installed inside the slide.

6. The automatic sewage flocculant delivery device according to claim 1, characterized in that: The telescopic part includes a telescopic groove symmetrically opened at the bottom end of the delivery box, a support rod is inserted into the telescopic groove, the support rod and the telescopic groove are connected by a spring, a T-shaped block is fixed to the bottom end of the support rod, and an annular groove slidably connected to the T-shaped block is opened at the top of the support seat.