Fresh-locking vacuum packaging machine for rice production

Abstract

The utility model relates to the technical field of rice production, in particular to a freshness-locking vacuum packaging machine for rice production, which not only can perform vacuum and heat sealing on rice packaging bags at the same time, but also can perform continuous operation on the rice packaging bags, thereby improving the working efficiency of the rice packaging bags. Comprising a first fixing frame, a hydraulic cylinder, a lifting plate, two sets of bidirectional screws, four sets of moving blocks, four sets of clamping plates, a vacuum pump, an air guide pipe, four sets of L-shaped plates, four sets of first electric push rods, two sets of heating plates, a second fixing frame, a storage hopper, a power mechanism and a conveying device. The output end of the hydraulic cylinder penetrates through the top end of the first fixing frame to be connected with the top end of the lifting plate, sliding grooves are formed in the left side and the right side of the bottom end of the lifting plate, the two bidirectional screws are rotationally installed in the two sliding grooves of the lifting plate respectively, a quantifying device is arranged in the storage hopper, and the conveying device is located below the storage hopper and the four clamping plates.

Description

Technical Field

[0001] This utility model relates to the technical field of rice production, and in particular to a vacuum sealing machine for rice production. Background Technology

[0002] Rice is one of the staple foods for billions of people worldwide, especially in Asia. It is a product obtained by processing paddy rice through hulling, cleaning, and other processes.

[0003] Rice needs to be vacuum-sealed and then heat-sealed during production. However, there are currently no integrated packaging and vacuuming devices on the market. Therefore, packaging and vacuuming must be carried out separately, which is cumbersome and results in low efficiency in rice packaging. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a vacuum sealing machine for rice production that can simultaneously vacuum and heat seal rice packaging bags, and can perform continuous operation, thereby improving its working efficiency.

[0005] This utility model discloses a vacuum sealing machine for rice production, comprising a first fixed frame, a hydraulic cylinder, a lifting plate, two sets of bidirectional screws, four sets of moving blocks, four sets of clamping plates, a vacuum pump, a gas guide pipe, four sets of L-shaped plates, four sets of first electric push rods, two sets of heating plates, a second fixed frame, a storage hopper, a power mechanism, and a conveying device. The hydraulic cylinder is mounted on the top of the first fixed frame, and its output end passes through the top of the first fixed frame and connects to the top of the lifting plate. Slide grooves are provided on the left and right sides of the bottom of the lifting plate. The two sets of bidirectional screws are rotatably mounted in the two sets of slide grooves on the lifting plate, and the front ends of the two sets of bidirectional screws pass through the front end of the lifting plate and connect to the power mechanism, which is mounted on the lifting plate. Four sets of moving blocks slide within two sets of sliding grooves on the lifting plate. Each of the four sets of moving blocks has a threaded hole connected to its upper part. The four sets of moving blocks are threadedly connected to two sets of bidirectional screws. Four sets of clamping plates are installed at the bottom of the four sets of moving blocks. A vacuum pump is installed at the bottom of the lifting plate. The inlet end of the air guide pipe is connected to the outlet end of the vacuum pump. Four sets of L-shaped plates are installed at the outer ends of the four sets of clamping plates. Four sets of first electric push rods are installed on the lower inner side of the four sets of L-shaped plates. Two sets of heating plates are installed at the outlet ends of the two sets of first electric push rods on the front and the two sets of first electric push rods on the rear, respectively. A storage hopper is installed on the top of the second fixed frame. A metering device is installed inside the storage hopper. The conveying device is located below the storage hopper and the four sets of clamping plates.

[0006] Preferably, the power mechanism includes two sets of pulleys, a belt, a first motor, and a motor frame. The two sets of pulleys are respectively installed at the front of two sets of bidirectional screws. The two sets of pulleys are synchronously driven by the belt. The output end of the first motor is connected to the front end of the left bidirectional screw. The first motor is installed inside the motor frame, and the motor frame is installed on the top left front side of the lifting plate.

[0007] Preferably, the conveying device includes four sets of vertical plates, two sets of conveying rollers, a conveyor belt, and a second motor. The two sets of conveying rollers are rotatably installed at the inner ends of the two left sets of vertical plates and the two right sets of vertical plates, respectively. The two sets of conveying rollers are synchronously driven by the conveyor belt. Multiple placement slots are provided at the outer end of the conveyor belt. The second motor is installed at the front end of the left front vertical plate. The output end of the second motor passes through the left front vertical plate and is connected to the front end of the left conveying roller.

[0008] Preferably, it also includes four sets of uprights, a top plate, and a scale. The four sets of uprights are respectively installed on the left front side, left rear side, right front side, and right rear side of the bottom end of the top plate. The scale is installed on the top of the top plate and is in contact with the upper right side of the inner end of the conveyor belt.

[0009] Preferably, it also includes two sets of second electric push rods, two sets of connecting plates and an auxiliary sleeve. The two sets of second electric push rods are respectively installed on the front and rear sides of the top of the second fixed frame. The output ends of the two sets of second electric push rods are respectively connected to the top of the two sets of connecting plates. The two sets of connecting plates are respectively installed on the front and rear ends of the auxiliary sleeve.

[0010] Preferably, it also includes a gantry frame, two sets of mounting plates, and two sets of fans. The gantry frame is located on the left side inside the conveyor belt, the two sets of mounting plates are respectively installed on the front and rear sides of the top of the gantry frame, and the two sets of fans are respectively installed on the top of the two sets of mounting plates.

[0011] Preferably, it also includes a cleaning scraper and a collection box. The cleaning scraper is installed obliquely at the inner end of the two sets of vertical plates on the left side, and the cleaning scraper contacts the lower left side of the conveyor belt. The collection box is located below the cleaning scraper.

[0012] Preferably, it also includes an emergency stop button, which is installed at the front end of the right front upright plate and is electrically connected to the hydraulic cylinder, vacuum pump, first electric push rod, heating plate, first motor, second motor, scale, second electric push rod and fan.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: The packaging bag is placed on the conveying device, and then the rice in the storage hopper is introduced into the packaging bag through a metering device. The conveying device then moves the packaging bag to the left. When the packaging bag aligns with the four sets of clamping plates, the hydraulic cylinder is activated, causing the lifting plate to move downwards. After the air duct is inserted into the packaging bag, the power mechanism is activated, driving two sets of bidirectional screws to rotate. These two sets of bidirectional screws are threadedly connected to four sets of moving blocks. The four sets of moving blocks then drive the four sets of clamping plates to press the packaging bag around the air duct. Finally, the vacuum pump is activated, and the contents of the packaging bag... The air is discharged through the air duct by a vacuum pump, thereby evacuating the packaging bag. Then, the four sets of first electric push rods are opened, which drive the two sets of heating plates to move inward simultaneously. The two sets of heating plates then contact the packaging bag and heat it to seal it. Afterward, the two sets of heating plates and the four sets of clamping plates are reset. The hydraulic cylinder is opened in reverse to reset the lifting plate as a whole. Then, the conveying device transports the vacuum-sealed rice packaging bag. By setting up this equipment, not only can rice packaging bags be vacuumed and heat-sealed simultaneously, but they can also be operated continuously, improving its working efficiency. Attached Figure Description

[0014] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0015] Figure 2 This is a second-view structural schematic diagram of the present invention;

[0016] Figure 3 yes Figure 1 A magnified structural diagram of A in the middle;

[0017] Figure 4 yes Figure 2 A magnified structural diagram of B in the diagram;

[0018] The attached diagram shows the following components: 1. First fixed frame; 2. Hydraulic cylinder; 3. Lifting plate; 4. Bidirectional screw; 5. Moving block; 6. Clamping plate; 7. Vacuum pump; 8. Air guide pipe; 9. L-shaped plate; 10. First electric push rod; 11. Heating plate; 12. Pulley; 13. Belt; 14. First motor; 15. Motor frame; 16. Second fixed frame; 17. Storage hopper; 18. Vertical plate; 19. Conveying roller; 20. Conveying belt; 21. Second motor; 22. Column; 23. Top plate; 24. Scale; 25. Second electric push rod; 26. Connecting plate; 27. Auxiliary sleeve; 28. Gantry frame; 29. ​​Mounting plate; 30. Fan; 31. Cleaning scraper; 32. Collection box; 33. Emergency stop button. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0020] like Figures 1 to 4 As shown, the present invention relates to a vacuum sealing machine for rice production, comprising a first fixed frame 1, a hydraulic cylinder 2, a lifting plate 3, two sets of bidirectional screws 4, four sets of moving blocks 5, four sets of clamping plates 6, a vacuum pump 7, an air guide pipe 8, four sets of L-shaped plates 9, four sets of first electric push rods 10, two sets of heating plates 11, a second fixed frame 16, a storage hopper 17, a power mechanism, and a conveying device. The hydraulic cylinder 2 is mounted on the top of the first fixed frame 1, and its output end passes through the top of the first fixed frame 1 and connects to the top of the lifting plate 3. Slide grooves are provided on the left and right sides of the bottom of the lifting plate 3. The two sets of bidirectional screws 4 are rotatably mounted in the two sets of slide grooves of the lifting plate 3, and the front ends of the two sets of bidirectional screws 4 pass through the front end of the lifting plate 3 and connect with the power mechanism. The power mechanism is mounted on the lifting plate 3. Four sets of movable blocks 5 slide in two sets of sliding grooves of lifting plate 3 respectively. Each set of movable blocks 5 has a threaded hole connected to its upper part. Each set of movable blocks 5 is threadedly connected to two sets of bidirectional screws 4 respectively. Four sets of clamping plates 6 are installed at the bottom of the four sets of movable blocks 5 respectively. Vacuum pump 7 is installed at the bottom of lifting plate 3. The input end of air guide pipe 8 is connected to the output end of vacuum pump 7. Four sets of L-shaped plates 9 are installed at the outer ends of the four sets of clamping plates 6 respectively. Four sets of first electric push rods 10 are installed on the lower side of the inner end of the four sets of L-shaped plates 9 respectively. Two sets of heating plates 11 are installed at the output ends of the two sets of first electric push rods 10 on the front side and the two sets of first electric push rods 10 on the rear side respectively. Storage hopper 17 is installed on the top of second fixed frame 16. A metering device is installed in storage hopper 17. The conveying device is located below storage hopper 17 and four sets of clamping plates 6.

[0021] The packaging bag is placed on the conveyor device, and then the rice in the storage hopper 17 is introduced into the packaging bag through the metering device. The conveyor device then moves the packaging bag to the left. When the packaging bag aligns with the four sets of clamping plates 6, the hydraulic cylinder 2 is activated, causing the lifting plate 3 to move downwards. Once the air guide pipe 8 is inserted into the packaging bag, the power mechanism is activated, driving the two sets of bidirectional screws 4 to rotate. The two sets of bidirectional screws 4 are threadedly connected to the four sets of moving blocks 5. The four moving blocks 5 then drive the four sets of clamping plates 6 to press the packaging bag around the air guide pipe 8. Finally, the vacuum pump 7 is activated, and the air inside the packaging bag is drawn in by the vacuum pump 7. The air duct 8 discharges air, thereby vacuuming the packaging bag. Then, the four sets of first electric push rods 10 are opened, which drive the two sets of heating plates 11 to move inward simultaneously. The two sets of heating plates 11 then contact the packaging bag and heat it to seal the bag. Afterward, the two sets of heating plates 11 and the four sets of clamping plates 6 are reset. The hydraulic cylinder 2 is opened in reverse, causing the lifting plate 3 to reset as a whole. Then, the conveying device transports the vacuum-sealed rice packaging bag. By setting up this equipment, not only can rice packaging bags be vacuumed and heat-sealed simultaneously, but continuous operation can also be performed, improving its working efficiency.

[0022] As a preferred embodiment of the above, the power mechanism includes two sets of pulleys 12, a belt 13, a first motor 14 and a motor frame 15. The two sets of pulleys 12 are respectively installed at the front of the two sets of bidirectional screws 4. The two sets of pulleys 12 are synchronously driven by the belt 13. The output end of the first motor 14 is connected to the front end of the left bidirectional screw 4. The first motor 14 is installed at the inner end of the motor frame 15. The motor frame 15 is installed on the top left front side of the lifting plate 3.

[0023] By setting up pulley 12, belt 13, first motor 14 and motor frame 15, the first motor 14 is turned on, which drives the left bidirectional screw 4 to rotate. The left bidirectional screw 4 then drives the right bidirectional screw 4 to rotate through two sets of pulleys 12 and belt 13. The two sets of bidirectional screws 4 are threadedly connected to four sets of moving blocks 5. Only one set of first motor 14 can drive the two sets of bidirectional screws 4 to rotate, saving costs.

[0024] As a preferred embodiment of the above, the conveying device includes four sets of vertical plates 18, two sets of conveying rollers 19, a conveyor belt 20, and a second motor 21. The two sets of conveying rollers 19 are respectively rotatably installed at the inner ends of the left two sets of vertical plates 18 and the inner ends of the right two sets of vertical plates 18. The two sets of conveying rollers 19 are synchronously driven by the conveyor belt 20. Multiple placement slots are provided at the outer end of the conveyor belt 20. The second motor 21 is installed at the front end of the left front vertical plate 18. The output end of the second motor 21 passes through the left front vertical plate 18 and is connected to the front end of the left conveying roller 19.

[0025] By setting up a vertical plate 18, a conveyor roller 19, a conveyor belt 20, and a second motor 21, the second motor 21 is turned on, which drives the left conveyor roller 19 to rotate. The left conveyor roller 19 drives the conveyor belt 20 to convey the packaging bags, which in turn carries out a series of operations such as filling the packaging bags with rice, vacuuming, and heat sealing.

[0026] As a preferred embodiment of the above, it also includes four sets of columns 22, a top plate 23 and a scale 24. The four sets of columns 22 are respectively installed on the left front side, left rear side, right front side and right rear side of the bottom end of the top plate 23. The scale 24 is installed on the top end of the top plate 23 and contacts the upper right side of the inner end of the conveyor belt 20.

[0027] By setting up a column 22, a top plate 23, and a scale 24, the scale 24 can detect the weight of the rice in the packaging bag in real time, which can further improve the accuracy of the amount of rice in the packaging bag.

[0028] As a preferred embodiment of the above embodiment, it further includes two sets of second electric push rods 25, two sets of connecting plates 26 and auxiliary sleeves 27. The two sets of second electric push rods 25 are respectively installed on the front and rear sides of the top end of the second fixed frame 16. The output ends of the two sets of second electric push rods 25 are respectively connected to the top ends of the two sets of connecting plates 26. The two sets of connecting plates 26 are respectively installed on the front and rear ends of the auxiliary sleeves 27.

[0029] By setting up the second electric push rod 25, the connecting plate 26 and the auxiliary sleeve 27, the packaging bag is placed in the rightmost placement slot of the conveyor belt 20. Then, the two sets of second electric push rods 25 are opened. The two sets of second electric push rods 25 drive the auxiliary sleeve 27 to move downward and contact the conveyor belt 20 through the two sets of connecting plates 26. The auxiliary sleeve 27 can prevent the packaging bag from tilting and spilling out when filling with rice.

[0030] As a preferred embodiment of the above embodiment, it also includes a gantry frame 28, two sets of mounting plates 29 and two sets of fans 30. The gantry frame 28 is located on the left side inside the conveyor belt 20. The two sets of mounting plates 29 are respectively installed on the front and rear sides of the top of the gantry frame 28. The two sets of fans 30 are respectively installed on the top of the two sets of mounting plates 29.

[0031] By setting up a gantry frame 28, a mounting plate 29, and a fan 30, and by turning on two sets of fans 30, the heat-sealing position of the packaging bag can be cooled, thereby improving the heat-sealing effect of the packaging bag.

[0032] As a preferred embodiment of the above embodiment, it also includes a cleaning scraper 31 and a collection box 32. The cleaning scraper 31 is obliquely installed at the inner end of the two sets of upright plates 18 on the left side. The cleaning scraper 31 is in contact with the lower left side of the conveyor belt 20. The collection box 32 is located below the cleaning scraper 31.

[0033] By setting up a cleaning scraper 31 and a collection box 32, the cleaning scraper 31 can clean the dust adhering to the surface of the conveyor belt 20, and the cleaned dust and impurities are collected in the collection box 32, which can ensure the cleanliness of the conveyor belt 20 and prevent dust and impurities from contaminating the packaging bags.

[0034] As a preferred embodiment of the above, it also includes an emergency stop button 33, which is installed at the front end of the right front upright plate 18 and is electrically connected to the hydraulic cylinder 2, vacuum pump 7, first electric push rod 10, heating plate 11, first motor 14, second motor 21, scale 24, second electric push rod 25 and fan 30.

[0035] By setting an emergency stop button 33, the equipment can be stopped easily by pressing the emergency stop button 33 in case of an emergency.

[0036] This utility model discloses a vacuum sealing machine for rice production. During operation, the packaging bag is first placed in the rightmost slot of the conveyor belt 20. Then, two sets of second electric push rods 25 are opened, causing the auxiliary sleeve 27 to move downwards and contact the conveyor belt 20 via two sets of connecting plates 26. Rice from the storage hopper 17 is then introduced into the packaging bag through a metering device. The two sets of second electric push rods 25 are then opened in reverse, causing the auxiliary sleeve 27 to reset. The second motor 21 is then activated, causing the conveyor belt 20 to transport the packaging bag to the left. Once the packaging bag aligns with the four clamping plates 6, the hydraulic cylinder 2 is activated, causing the lifting plate 3 to move downwards. After the air guide pipe 8 is inserted into the packaging bag, the first motor 14 is activated, causing the left-side bidirectional screw 4 to rotate. The screw 4 drives the right-side bidirectional screw 4 to rotate through two sets of pulleys 12 and belt 13. The two sets of bidirectional screws 4 are threadedly connected to four sets of moving blocks 5. The four sets of moving blocks 5 drive four sets of clamping plates 6 to press the packaging bag around the air guide pipe 8. Then, the vacuum pump 7 is turned on, and the air in the packaging bag is discharged through the air guide pipe 8, thereby evacuating the packaging bag. Then, the four sets of first electric push rods 10 are turned on, which drive the two sets of heating plates 11 to move inward at the same time. The two sets of heating plates 11 contact the packaging bag and heat it to seal the packaging bag. Then, the two sets of heating plates 11 and the four sets of clamping plates 6 are reset. The hydraulic cylinder 2 is turned on in the opposite direction to reset the lifting plate 3 as a whole. Then, the conveyor belt 20 transports the vacuum heat-sealed rice packaging bag, and the two sets of fans 30 cool the heat-sealed part of the packaging bag.

[0037] The vacuum sealing machine for rice production described in this utility model uses common mechanical methods for installation, connection, and setup, and can be implemented as long as it achieves the desired beneficial effect. The hydraulic cylinder 2, vacuum pump 7, first electric push rod 10, heating plate 11, first motor 14, second motor 21, scale 24, second electric push rod 25, fan 30, and emergency stop button 33 of the vacuum sealing machine for rice production described in this utility model are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A vacuum sealing machine for rice production, characterized in that, The system includes a first fixed frame (1), a hydraulic cylinder (2), a lifting plate (3), two sets of bidirectional screws (4), four sets of moving blocks (5), four sets of clamping plates (6), a vacuum pump (7), a duct pipe (8), four sets of L-shaped plates (9), four sets of first electric push rods (10), two sets of heating plates (11), a second fixed frame (16), a storage hopper (17), a power mechanism, and a conveying device. The hydraulic cylinder (2) is installed at the top of the first fixed frame (1). The output end of the hydraulic cylinder (2) passes through the top of the first fixed frame (1) and connects to the top of the lifting plate (3). Slide grooves are provided on the left and right sides of the bottom end of the lifting plate (3). The two sets of bidirectional screws (4) are rotatably installed in the two sets of slide grooves of the lifting plate (3). The front ends of the two sets of bidirectional screws (4) pass through the front end of the lifting plate (3) and are connected to the power mechanism. The power mechanism is installed on the lifting plate (3). The four sets of moving blocks (5) are respectively located at the top of the first fixed frame (1), the hydraulic cylinder (2), the lifting plate (3), the lifting plate (4), the lifting plate (3 ... The lifting plate (3) slides in the two sets of sliding grooves. The upper part of the four sets of moving blocks (5) is connected with threaded holes. The four sets of moving blocks (5) are threadedly connected to the two sets of bidirectional screws (4). The four sets of clamping plates (6) are installed at the bottom of the four sets of moving blocks (5). The vacuum pump (7) is installed at the bottom of the lifting plate (3). The input end of the air guide pipe (8) is connected to the output end of the vacuum pump (7). The four sets of L-shaped plates (9) are installed at the outer ends of the four sets of clamping plates (6). The four sets of first electric push rods (10) are installed at the lower side of the inner end of the four sets of L-shaped plates (9). The two sets of heating plates (11) are installed at the output ends of the two sets of first electric push rods (10) on the front side and the two sets of first electric push rods (10) on the rear side. The storage hopper (17) is installed on the top of the second fixed frame (16). A metering device is installed in the storage hopper (17). The conveying device is located below the storage hopper (17) and the four sets of clamping plates (6).

2. The vacuum sealing machine for rice production as described in claim 1, characterized in that, The power mechanism includes two sets of pulleys (12), a belt (13), a first motor (14) and a motor frame (15). The two sets of pulleys (12) are respectively installed in front of the two sets of bidirectional screws (4). The two sets of pulleys (12) are synchronously driven by the belt (13). The output end of the first motor (14) is connected to the front end of the left bidirectional screw (4). The first motor (14) is installed in the inner end of the motor frame (15). The motor frame (15) is installed on the left front side of the top of the lifting plate (3).

3. The vacuum sealing machine for rice production as described in claim 2, characterized in that, The conveying device includes four sets of vertical plates (18), two sets of conveying rollers (19), a conveyor belt (20), and a second motor (21). The two sets of conveying rollers (19) are respectively rotatably installed on the inner ends of the two left sets of vertical plates (18) and the two right sets of vertical plates (18). The two sets of conveying rollers (19) are synchronously driven by the conveyor belt (20). Multiple placement slots are provided at the outer end of the conveyor belt (20). The second motor (21) is installed at the front end of the left front vertical plate (18). The output end of the second motor (21) passes through the left front vertical plate (18) and is connected to the front end of the left conveying roller (19).

4. The vacuum sealing machine for rice production as described in claim 3, characterized in that, It also includes four sets of columns (22), a top plate (23) and a scale (24). The four sets of columns (22) are installed on the left front side, left rear side, right front side and right rear side of the bottom end of the top plate (23) respectively. The scale (24) is installed on the top of the top plate (23) and contacts the upper right side of the inner end of the conveyor belt (20).

5. The vacuum sealing machine for rice production as described in claim 4, characterized in that, It also includes two sets of second electric push rods (25), two sets of connecting plates (26) and auxiliary sleeve (27). The two sets of second electric push rods (25) are respectively installed on the front and rear sides of the top of the second fixed frame (16). The output ends of the two sets of second electric push rods (25) are respectively connected to the top of the two sets of connecting plates (26). The two sets of connecting plates (26) are respectively installed on the front and rear ends of the auxiliary sleeve (27).

6. The vacuum sealing machine for rice production as described in claim 5, characterized in that, It also includes a gantry frame (28), two sets of mounting plates (29) and two sets of fans (30). The gantry frame (28) is located on the left side inside the conveyor belt (20). The two sets of mounting plates (29) are installed on the front and rear sides of the top of the gantry frame (28) respectively. The two sets of fans (30) are installed on the top of the two sets of mounting plates (29) respectively.

7. The vacuum sealing machine for rice production as described in claim 6, characterized in that, It also includes a cleaning scraper (31) and a collection box (32). The cleaning scraper (31) is installed at an angle on the inner end of the two sets of upright plates (18) on the left side. The cleaning scraper (31) is in contact with the lower left side of the conveyor belt (20). The collection box (32) is located below the cleaning scraper (31).

8. The vacuum sealing machine for rice production as described in claim 7, characterized in that, It also includes an emergency stop button (33), which is installed at the front end of the right front upright plate (18). The emergency stop button (33) is electrically connected to the hydraulic cylinder (2), vacuum pump (7), first electric push rod (10), heating plate (11), first motor (14), second motor (21), scale (24), second electric push rod (25) and fan (30).

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