Vertical vacuum full-automatic sealing machine

Abstract

The utility model relates to a vertical type vacuum full-automatic sealing machine which comprises a sealing mechanism, a lifting mechanism and a conveying mechanism. A suction nozzle following synchronous belt, a suction nozzle walking linear guide rail, a suction nozzle following motor, a first sponge belt transmission assembly motor, a first sponge belt power coupling gear, a first sponge belt transmission synchronous belt, a second sponge belt motor transmission chain, a second sponge belt power coupling gear, a long-strip heating block and a code spraying box are installed in the sealing machine main case. The sealing machine sealing belt comprises a material guiding piece, a first sponge belt transmission assembly and a second sponge belt transmission assembly. The sealing machine sealing belt further comprises a material guiding piece, a first sponge belt transmission assembly and a second sponge belt transmission assembly. Through reasonable arrangement, the packaging container is sealed through full-automatic operation, labor cost is saved, working efficiency is improved, the structure is simple, operation is convenient, and production requirements can be met.

Description

Technical Field

[0001] The utility model relates to the field of sealing machines, in particular to a vertical vacuum full-automatic sealing machine. Background Art

[0002] A sealing machine is a machine that seals the container after it has been filled with product. It ensures that the product is sealed and preserved, maintaining product quality, preventing product loss, and extending shelf life.

[0003] At present, the vacuum sealing machines on the market require manual assistance to complete the vacuuming work. They cannot be fully automated, are time-consuming and labor-intensive, have low work efficiency, and have high labor costs. Utility Model Content

[0004] Based on this, it is necessary to provide a vertical vacuum fully automatic sealing machine to address the above problems.

[0005] A vertical vacuum automatic sealing machine comprises a frame, a column and a frame base, and also comprises a sealing mechanism, a lifting mechanism and a conveying mechanism. The lifting mechanism and the conveying mechanism are both mounted on the frame base, and the sealing mechanism is mounted on the lifting mechanism. The sealing mechanism comprises a sealing machine main chassis and a sealing belt of the sealing machine. The main chassis of the sealing machine is equipped with a suction nozzle following synchronous belt, a suction nozzle walking linear guide rail, a suction nozzle following motor, a first sponge belt transmission assembly motor, a first sponge belt power coupling gear, a first sponge belt transmission synchronous belt, a second sponge belt motor transmission chain, a second sponge belt power coupling gear, a long heating block and a code spraying box.

[0006] The sealing belt of the sealing machine includes a guide plate, a first sponge belt transmission assembly and a second sponge belt transmission assembly. The guide plate is installed on one side of the bottom of the sealing machine main case, the first sponge belt transmission assembly is installed on the bottom of the sealing machine main case near the guide plate, and the second sponge belt transmission assembly is installed on the other side of the bottom of the sealing machine main case.

[0007] In one embodiment, the sealing machine main chassis is also provided with a sealing bag pressing cylinder, a bag opening photoelectric detector, a sealing position photoelectric detector, a bag end photoelectric detector, a coding screen, a first temperature control and a second temperature control, and the sealing machine main chassis is also provided with a height limit plate on the side close to the guide plate.

[0008] In one embodiment, the lifting mechanism includes a lifting screw, a linear guide rail, a guide guardrail, a main box lifting clutch, a conveyor platform lifting clutch, a second conveyor platform lifting cylinder and a nozzle lifting cylinder. A tracheal walking drag chain is provided on one side of the nozzle lifting cylinder, and a suction nozzle is connected to its lower end. The linear guide rail is installed on the column.

[0009] In one embodiment, the conveying mechanism includes a conveying platform, a first conveying platform motor and a second conveying platform motor. The conveying platform includes a first conveying platform, a second conveying platform, a feed roller and a discharge roller. The first conveying platform is connected and fixed to the feed roller, and the discharge roller is connected and fixed to the second conveying platform.

[0010] In one embodiment, a pneumatic component control box and an electrical transfer box are also installed on the back of the main chassis of the sealing machine. The pneumatic component control box is equipped with a suction cup control valve, multiple cylinder control valves, an air extraction and inflation isolation valve, an inflation air pressure regulator, a cylinder air pressure regulator, a vacuum drive air pressure regulator, an air extraction valve and an air inflation valve.

[0011] In one embodiment, the electric control box is located on a side close to the guide sheet, and a touch screen, a power indicator light, an alarm light, a power start button, an operation stop button and a power emergency stop button are provided on the top of the electric control box, and a first aviation plug, a second aviation plug, a cable bellows connector and a bellows connector mounting plate are provided on one side of the electric control box.

[0012] In one embodiment, the electric control box is also provided with a front door, a rear door, a door lock and a rubber wheel. The door lock is installed on the front door of the electric control box. The rubber wheel is installed on the four corners of the bottom of the electric control box, and the rubber wheel is provided with a foot brake.

[0013] In one embodiment, a bag opening cylinder and a bag opening suction cup are further provided on the side of the sealing machine main chassis close to the height limit plate. The first sponge belt transmission assembly and the second sponge belt transmission assembly have the same structure and both include a transmission belt, a driven wheel and a driving wheel.

[0014] In one embodiment, the electrical transfer box is provided with a wire corrugated conduit connector.

[0015] In one embodiment, universal wheels and foot cups are provided at the four corners of the bottom of the frame.

[0016] The above-mentioned vertical vacuum fully automatic sealing machine completes the fully automated process from feeding to discharging by setting up a sealing mechanism, a lifting mechanism and a conveying mechanism. It not only greatly improves work efficiency, but also reduces labor costs and can meet production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the overall structure of the utility model from another angle;

[0019] Figure 3 This is a schematic diagram of the internal structure of the sealing machine main chassis;

[0020] Figure 4 This is a schematic diagram of the sealing belt structure of the sealing machine;

[0021] Figure 5 Schematic diagram of the conveying mechanism structure;

[0022] Figure 6 This is a schematic diagram of the internal structure of the pneumatic component control box;

[0023] Figure 7 It is a schematic diagram of the structure of the electric control box;

[0024] 1 rack, 11 columns, 12 rack base, 2 electric control box, 21 touch screen, 211 electric control box front door, 2111 electric control box door lock, 212 electric control box rear door, 213 electric control box rubber wheel, 22 power indicator light, 23 alarm light, 24 power start button, 25 operation stop button, 26 power emergency stop button, 27 first aviation plug, 28 second aviation plug, 29 cable bellows connector, 210 bellows connector mounting plate, 3 sealing mechanism, 300 sealing machine main chassis, 301 sealing machine sealing tape 、31 Suction nozzle follows synchronous belt, 311 bag opening photoelectric detector, 312 sealing position photoelectric detector, 313 bag end photoelectric detector, 314 inkjet screen, 315 first temperature control, 316 second temperature control, 317 height limiter, 318 bag opening cylinder, 319 bag opening suction cup, 320 sealing bag pressing cylinder, 32 suction nozzle walking linear guide, 321 guide piece, 322 first sponge belt transmission assembly, 323 second sponge belt transmission assembly, 324 driven wheel, 325 driving wheel, 326 transmission belt, 33 suction Nozzle follower motor, 34 first sponge belt transmission assembly motor, 35 first sponge belt power coupling gear, 36 first sponge belt transmission synchronous belt, 37 second sponge belt motor transmission chain, 38 second sponge belt power coupling gear, 39 long heating block, 310 inkjet printer box, 4 lifting mechanism, 41 lifting screw, 42 linear guide rail, 43 guide guardrail, 44 main box lifting clutch, 45 conveyor platform lifting clutch, 46 second conveyor platform lifting cylinder, 47 nozzle lifting cylinder, 48 air pipe walking drag chain, 49 suction Nozzle, 5 conveying mechanism, 51 conveying platform, 52 first conveying platform motor, 53 second conveying platform motor, 512 first conveying platform, 511 second conveying platform, 54 feed roller, 55 discharge roller, 6 pneumatic component control box, 61 suction cup control valve, 62 multiple cylinder control valves, 63 extraction and inflation isolation valve, 64 inflation air pressure regulator, 65 cylinder air pressure regulator, 66 vacuum drive air pressure regulation, 67 extraction valve, 68 inflation valve, 7 electrical transfer box, 71 wire corrugated pipe joint, 8 universal wheel, 9 foot cup. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only."

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] A vertical vacuum fully automatic sealing machine includes a frame 1, a column 11 and a frame base 12, and also includes a sealing mechanism 3, a lifting mechanism 4 and a conveying mechanism 5. The lifting mechanism 4 and the conveying mechanism 5 are both installed on the frame base 12, and the sealing mechanism 3 is installed on the lifting mechanism 4. The sealing mechanism 3 includes a sealing machine main box 300 and a sealing belt 301 for the sealing machine. The main box 300 of the sealing machine is equipped with a suction nozzle 49 following a synchronous belt 31, a suction nozzle walking linear guide 32, a suction nozzle following motor 33, a first sponge belt transmission assembly motor 34, a first sponge belt power coupling gear 35, a first sponge belt transmission synchronous belt 36, a second sponge belt motor transmission chain 37, a second sponge belt power coupling gear 38, a long heating block 39 and a coding box 310.

[0029] The sealing belt 301 of the sealing machine includes a guide plate 321, a first sponge belt transmission component 322 and a second sponge belt transmission component 323. The guide plate 321 is installed on one side of the bottom of the sealing machine main case 300, the first sponge belt transmission component 322 is installed on the bottom of the sealing machine main case 300 close to the guide plate 321, and the second sponge belt transmission component 323 is installed on the other side of the bottom of the sealing machine main case 300; by setting the above-mentioned sealing machine main case 300 and sealing belt 301, the sealing belt 301 of the sealing machine is controlled by the sealing machine main case 300, so that the packaging container can automatically move and seal on the sealing belt 301 of the sealing machine.

[0030] Furthermore, the sealing machine main box 300 is also provided with a sealing bag pressing cylinder 320, a bag opening photoelectric detector 311, a sealing position photoelectric detector 312, a bag end photoelectric detector 313, a coding screen 314, a first temperature control 315 and a second temperature control 316, and the sealing machine main box 300 is also provided with a height limiting plate 317 on the side close to the guide plate 321; by setting the bag opening photoelectric detector 311, it can detect whether the bag mouth of the packaging bag container has been opened, the sealing position photoelectric detector 312 can detect whether the packaging bag container has been sealed, and the bag end photoelectric detector 313 detects whether the packaging bag container has completed the entire process. The coding screen 314 can be used to control the coding box 310 to print the date and other marks on the packaging bag.

[0031] Furthermore, the lifting mechanism 4 includes a lifting screw 41, a linear guide rail 42, a guide guardrail 43, a main box lifting clutch 44, a conveyor platform lifting clutch 45, a second conveyor platform lifting cylinder 46 and a suction nozzle lifting cylinder 47. A tracheal walking drag chain 48 is provided on one side of the suction nozzle lifting cylinder 47, and a suction nozzle 49 is connected to its lower end. The linear guide rail 42 is installed on the column 11; by setting the lifting mechanism 4, the height of the sealing machine main box 300 and the conveyor platform 51 can be controlled to adapt to the sizes of different packaging containers.

[0032] Furthermore, the conveying mechanism 5 includes a conveying platform 51, a first conveying platform motor 52, and a second conveying platform motor 53. The conveying platform 51 includes a first conveying platform 512, a second conveying platform 511, a feed roller 54, and a discharge roller 55. The first conveying platform 512 is fixedly connected to the feed roller 54, and the discharge roller 55 is fixedly connected to the second conveying platform 511. The first conveying platform motor 52 controls the operation of the first conveying platform 512 and the second conveying platform motor 53 respectively. The feed roller 54 is used to deliver packaging containers to the first conveying platform 512, and the discharge roller 55 is used to deliver sealed packaging containers out of the sealing machine.

[0033] Furthermore, the back of the sealing machine main chassis 300 is also equipped with a pneumatic component control box 6 and an electrical transfer box 7. The pneumatic component control box 6 is equipped with a suction cup control valve 61, multiple cylinder control valves 62, an air extraction and charging isolation valve 63, an air charging pressure regulator 54, a cylinder air pressure regulator 65, a vacuum drive air pressure regulator 66, an air extraction valve 67, and an air charging valve 68. The input pressure of all air pressure adjustment devices must be less than or equal to 0.8Mpa. The adjustment devices are equipped with a barometer to indicate the output air pressure value. When adjustment is needed, lift the adjustment knob upwards. Turn it clockwise to increase the pressure and counterclockwise to decrease it.

[0034] Cylinder air pressure regulator 65: used to adjust the air pressure source of all cylinders, generally adjusted between 0.4-0.55Mpa.

[0035] Vacuum drive air pressure regulator 66: used to adjust the air inlet pressure of the vacuum drive valve, generally adjusted between 0.4-0.65Mpa. The vacuum drive air pressure regulator and the cylinder air pressure regulator are connected to the same air pressure source and connected to a 12mm air pipe.

[0036] Inflation pressure regulator 54: Used to adjust the inflation pressure, typically between 0.2-0.5 MPa. If the user requires additional air, this can be connected to the same air pressure source as the cylinder pressure regulator. Otherwise, the user will need to configure a separate air pressure source with an input pressure of 0.8 MPa or less, connected to an 8mm air line.

[0037] Furthermore, the electrical control box 2 is located on a side close to the guide piece 321, and the top of the electrical control box 2 is provided with a touch screen 21, a power indicator light 22, an alarm light 23, a power start button 24, an operation stop button 25 and a power emergency stop button 26, and one side of the electrical control box 2 is provided with a first aviation plug 27, a second aviation plug 28, a cable bellows connector 29 and a bellows connector mounting plate 210.

[0038] The electric control box 2 and the electrical part of the sealing machine body are connected by cables through the first aviation plug 27, the second aviation plug 28 and the bellows connector plate 210. The electric control box 2 is equipped with components such as PLC and driver to control the operation of the sealing machine. Human-computer interaction is through the touch screen 21. When the PLC detects a related fault, it will be displayed on the touch screen 21, and the alarm light 23 will emit an audible and visual alarm. The electric control box 2 is equipped with an emergency stop button, which can be pressed when an emergency power outage or power off is required. Just turn it clockwise to reset. The power start button 24 is used to turn on the power. Just press it once (the button will light up to indicate that it is on). If you need to turn off the power, press the emergency stop button. The power indicator light 22 lights up after the power is connected. The run / stop button is used to enter the automatic state when the sealing machine is running automatically. Press it once to start, press it again to stop, and repeat.

[0039] Furthermore, the electric control box 2 is also provided with an electric control box front door 211, an electric control box rear door 212, an electric control box door lock 2111 and an electric control box rubber wheel 213. The electric control box door lock 2111 is installed on the electric control box front door 211, and the electric control box rubber wheel 213 is installed on the four corners of the bottom of the electric control box 2, and the electric control box rubber wheel 213 is provided with a foot brake.

[0040] Furthermore, a bag opening cylinder 318 and a bag opening suction cup 319 are provided on one side of the sealing machine main box 300 close to the height limiting plate 317. The first sponge belt transmission assembly 322 and the second sponge belt transmission assembly 323 have the same structure and both include a transmission belt 326, a driven wheel 324 and a driving wheel 325.

[0041] Furthermore, the electrical transfer box 7 is provided with a wire corrugated pipe joint 71; by providing the wire corrugated pipe joint 71, the wires can be effectively protected from damage by external links.

[0042] Furthermore, universal wheels 8 and foot cups 9 are provided at the four corners of the bottom of the frame 1; the provision of the universal wheels 8 and foot cups 9 facilitates the movement and fixation of the sealing machine.

[0043] It should be noted that when using the sealing machine, first, respectively open the main box lifting clutch 44 and the conveyor platform lifting clutch 45, and move the sealing machine main box 300 and the conveyor platform 51 to the position corresponding to the size of the packaging container to be sealed this time through the lifting screw 41; then connect the 220V power supply (the power indicator light 22 is on), use the 12mm air pipe to connect the appropriate air source, make sure that the emergency stop button is not in the depressed state, press the power start button 24, and the electric control box 2 will be powered on (the power start button 24 indicator light is on); after the power is turned on, the sealing machine will automatically detect and automatically return to its position (there will be a display on the screen). Specifically including:

[0044] After the suction nozzle 49 rises, it automatically returns to the bag opening position;

[0045] B If the second conveyor platform 511 is not detected to have been lowered into place, the second conveyor platform 511 will automatically rotate for a period of time to ensure that the goods on the second conveyor platform 511 are discharged, and then the second conveyor platform 511 will be lowered into place; after returning to the initial position, check whether the relevant sealing parameters on the touch screen 21 meet the operating standards of the current product, otherwise they need to be adjusted.

[0046] After pressing the "operation stop button 25" of the electric control box 2, the button light will be on, indicating that the system has entered the automatic operation state.

[0047] At this point, the conveyor line, the first sponge belt drive assembly 322, and the second sponge belt drive assembly 323 are rotating, indicating that the bag can be placed and sealed. The packaging belt containing the items is placed into the feed roller 54 according to the reference of the height limit plate 317 and the guide plate 321 (when used for vacuuming, there should be no water, oil, or powder inside). After that, it reaches the bag opening position driven by the first conveyor 512 and the first sponge belt drive assembly 322. After reaching the bag opening position, the switch light of the bag opening photoelectric detector 311 lights up, and at the same time, the first conveyor 512 and the first sponge belt drive assembly 322 stop. The bag opening cylinder 318 is activated, and the bag opening suction cup 319 sucks air to open the bag mouth. The suction nozzle 49 is inserted downward into the bag (the height of the suction nozzle 49 can be adjusted by the suction nozzle lifting cylinder 47). After that, the first conveyor 512, the first sponge belt drive assembly 322, and the suction nozzle 49 move synchronously to the sealing position.

[0048] Upon reaching the sealing position, the sealing position photoelectric detector 312 switches on and off, illuminating the second conveyor platform 511, the second sponge belt drive assembly 323, and the suction nozzle 49. The suction nozzle 49 then begins pumping or filling air. During the pumping process, the second conveyor platform lift cylinder 46 can be used to simultaneously raise the second conveyor platform 511 (selected on the touch screen 21) to ensure that the second conveyor platform 511 maintains support for the contents of the packaging bag as the pumping process progresses, preventing deformation of the bag opening. After the vacuuming process is complete, the suction nozzle 49 ascends and returns to the bag opening position, allowing the bag opening process to continue. Simultaneously, the sealing and pressing cylinder 320 activates, pushing the heating block to seal the bag. Once sealing is complete, the sealing cylinder retracts. The second conveyor platform 511 and the second sponge belt drive assembly 323 continue rotating. Upon reaching the inkjet printer 310, the inkjet printer photoelectric switch illuminates, indicating synchronized inkjet printing. After the bag passes the second conveyor platform 511, it descends back to its original position, waiting for the next bag to be pumped and sealed.

[0049] The above-mentioned vertical vacuum fully automatic sealing machine completes the fully automated process from feeding to discharging by setting up a sealing mechanism 3, a lifting mechanism 4 and a conveying mechanism 5. Not only is the work efficiency greatly improved, but the labor cost is also reduced, which can meet production needs.

[0050] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A vertical vacuum automatic sealing machine, comprising an electric control box, a frame, a column and a frame base, characterized in that: It also includes a sealing mechanism, a lifting mechanism and a conveying mechanism. The lifting mechanism and the conveying mechanism are both installed on the frame base. The sealing mechanism is installed on the lifting mechanism. The sealing mechanism includes a sealing machine main box and a sealing belt of the sealing machine. The main box of the sealing machine is equipped with a nozzle following synchronous belt, a nozzle walking linear guide rail, a nozzle following motor, a first sponge belt transmission assembly motor, a first sponge belt power coupling gear, a first sponge belt transmission synchronous belt, a second sponge belt motor transmission chain, a second sponge belt power coupling gear, a long heating block and a code spray box. The sealing belt of the sealing machine includes a guide plate, a first sponge belt transmission assembly and a second sponge belt transmission assembly. The guide plate is installed on one side of the bottom of the sealing machine main case, the first sponge belt transmission assembly is installed on the bottom of the sealing machine main case near the guide plate, and the second sponge belt transmission assembly is installed on the other side of the bottom of the sealing machine main case.

2. A vertical vacuum automatic sealing machine according to claim 1, characterized in that: The main box of the sealing machine is also provided with a sealing and bag pressing cylinder, a bag opening photoelectric detector, a sealing position photoelectric detector, a bag end photoelectric detector, a coding screen, a first temperature control and a second temperature control, and the main box of the sealing machine is also provided with a height limit plate on the side close to the guide plate.

3. A vertical vacuum automatic sealing machine according to claim 1, characterized in that: The lifting mechanism includes a lifting screw, a linear guide rail, a guide guardrail, a main box lifting clutch, a conveyor platform lifting clutch, a second conveyor platform lifting cylinder and a suction nozzle lifting cylinder. A tracheal walking drag chain is provided on one side of the suction nozzle lifting cylinder, and a suction nozzle is connected to its lower end. The linear guide rail is installed on the column.

4. A vertical vacuum automatic sealing machine according to claim 3, characterized in that: The conveying mechanism includes a conveying platform, a first conveying platform motor and a second conveying platform motor. The conveying platform includes a first conveying platform, a second conveying platform, a feed roller and a discharge roller. The first conveying platform is connected and fixed to the feed roller, and the discharge roller is connected and fixed to the second conveying platform.

5. The vertical vacuum automatic sealing machine according to claim 2, characterized in that: A pneumatic component control box and an electrical transfer box are also installed on the back of the sealing machine main chassis. The pneumatic component control box is equipped with a suction cup control valve, multiple cylinder control valves, an air extraction and inflation isolation valve, an inflation air pressure regulator, a cylinder air pressure regulator, a vacuum drive air pressure regulator, an air extraction valve and an air inflation valve.

6. A vertical vacuum automatic sealing machine according to claim 1, characterized in that: The electric control box is located on a side close to the guide sheet, and a touch screen, a power indicator light, an alarm light, a power start button, an operation stop button and a power emergency stop button are provided on the top of the electric control box. A first aviation plug, a second aviation plug, a cable bellows connector and a bellows connector mounting plate are provided on one side of the electric control box.

7. A vertical vacuum automatic sealing machine according to claim 6, characterized in that: The electric control box is also provided with a front door, a rear door, a door lock and a rubber wheel. The door lock is installed on the front door of the electric control box. The rubber wheel is installed on the four corners of the bottom of the electric control box, and the rubber wheel is provided with a foot brake.

8. The vertical vacuum automatic sealing machine according to claim 2, characterized in that: A bag opening cylinder and a bag opening suction cup are also provided on one side of the sealing machine main box close to the height limit plate. The first sponge belt transmission assembly and the second sponge belt transmission assembly have the same structure and both include a transmission belt, a driven wheel and a driving wheel.

9. The vertical vacuum automatic sealing machine according to claim 5, characterized in that: The electrical transfer box is provided with a wire corrugated pipe connector.

10. A vertical vacuum automatic sealing machine according to any one of claims 1 to 9, characterized in that: The four corners of the bottom of the frame are all provided with universal wheels and foot cups.

Images