CN214002100U

CN214002100U - Food packaging machine

Info

Publication number: CN214002100U
Application number: CN202022538009.1U
Authority: CN
Inventors: 朱建栋
Original assignee: Zhucheng Zhonghe Xinghui Internet Of Things Technology Co ltd
Current assignee: Zhucheng Zhonghe Xinghui Internet Of Things Technology Co ltd
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2021-08-20
Anticipated expiration: 2030-11-05

Abstract

The utility model relates to the technical field of accessories of food packaging equipment, in particular to a food packaging machine, which is additionally provided with a food filling amount control device, thereby reducing the difficulty of filling granular food with specified amount into a plastic packaging bag at one time, namely simplifying the food packaging process, and improving the use convenience of the food packaging machine; the plastic bag sealing machine assembly is provided with an operating table, a plastic bag sealing mechanism and a support, the left end of the fixed plate is connected with the right end of the operating table, a containing cavity is formed in the containing box, and the top end of the containing cavity is communicated with a material taking port; the device comprises a fixed plate, a movable plate, a control block, a control frame and a feeder, and is characterized by further comprising two groups of supporting rods, a control block, a limiting pipe, two groups of driving rods, two groups of supporting plates, two groups of reset rods, two groups of reset springs, two groups of baffles, an operation and control frame and a feeder, wherein the bottom ends of the two groups of supporting rods are respectively connected with the left rear side and the right rear side of the top end of the fixed plate, and a control cavity is arranged inside the control block.

Description

Food packaging machine

Technical Field

The utility model relates to a food packaging equipment auxiliary device's technical field especially relates to a food packaging machinery.

Background

It is well known that food packaging is an integral part of the food commodity, one of the major projects in the food industry process. The food package protects the food, prevents the damage of biological, chemical and physical external factors in the process of the food leaving the factory to the hand of the consumer, has the function of keeping the stable quality of the food, is convenient for the food to eat, firstly shows the appearance of the food, attracts the image of consumption and has value beyond the material cost. Food packaging machines, which are devices for packing granular food into a packaging bag and plastically packaging the packaging bag, are widely used in the field of food processing; the existing food packaging machine comprises a plastic bag sealing machine assembly, a containing box, a fixed plate, a material taking spoon and a weighing mechanism, wherein the plastic bag sealing machine assembly is provided with an operating table, a plastic bag sealing mechanism and a support, the left end of the fixed plate is connected with the right end of the operating table, the bottom end of the containing box and the bottom end of the bearing mechanism are respectively attached to the rear side and the front side of the top end of the fixed plate, a containing cavity is arranged in the containing box, and the top end of the containing cavity is communicated with the material taking port; when the existing food packaging machine is used, firstly, a worker takes out a proper amount of granular food in a containing box through a material taking spoon, the granular food taken out is put into a plastic packaging bag, then the food quality in the plastic packaging bag is weighed through a weighing mechanism, if the food quality just meets the requirement, the plastic packaging bag containing the granular food is taken to a plastic bag sealing machine component, and the plastic bag sealing mechanism is used for inflating and sealing the inside of the plastic packaging bag; the existing food packaging machine is used for finding that when workers pack granular food into a plastic packaging bag, due to human factors, the difficulty of packing specified amount of granular food into the plastic packaging bag at one time is higher, so that the probability of repeatedly adjusting the amount of the granular food in the plastic packaging bag is higher, the food packaging process is complicated, the use convenience of the existing food packaging machine is reduced, and the practicability is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an add food load control device, consequently reduced the degree of difficulty of once only packing into appointed volume granular food in to the plastic packaging bag, simplified the food packaging process promptly, therefore improved food packaging machine's use convenience to strengthen the food packaging machine of practicality.

The utility model discloses a food packaging machine, including plastic bag sealing machine subassembly, holding case and fixed plate, plastic bag sealing machine subassembly is provided with operation panel, plastic bag sealing mechanism and support, and the left end of fixed plate is connected with the right-hand member of operation panel, holds the incasement and is provided with and holds the chamber, holds the top intercommunication in chamber and is provided with and gets the material mouth; the bottom ends of the two groups of supporting rods are respectively connected with the left rear side and the right rear side of the top end of the fixed plate, the top ends of the two groups of supporting rods are respectively connected with the left rear side and the right rear side of the bottom end of the containing box, the top end of the limiting pipe is communicated with the bottom end of the containing box and is provided with a communicating hole, the control block is slidably clamped with the limiting pipe, the top end of the control block penetrates through the communicating hole from the limiting pipe and extends into the containing cavity, a control cavity is arranged inside the control block, two groups of inflow holes are respectively arranged on the front side and the rear side of the top end of the control cavity in a penetrating manner, two groups of outflow holes are respectively arranged on the front side and the rear side of the bottom end of the control cavity in a penetrating manner, and two groups of sliding holes are respectively arranged on the bottom areas of the left end and the right end of the inner circumferential wall of the limiting pipe in a communicating manner, the inner ends of the two groups of driving rods respectively penetrate through two groups of sliding holes from the outer side of the limiting pipe and respectively extend into the limiting pipe, the inner ends of the two groups of driving rods are respectively connected with the bottom areas of the left end and the right end of the control block, the inner ends of the two groups of supporting plates are respectively connected with the middle parts of the left end and the right end of the limiting pipe, the top ends of the two groups of supporting plates are respectively provided with two groups of telescopic holes in a penetrating manner, the two groups of telescopic holes are respectively clamped with two groups of reset rods in a sliding manner, the top ends of the two groups of reset rods are respectively connected with the bottom ends of two groups of baffles, the two groups of reset springs are respectively movably sleeved with the two groups of reset rods, the top ends and the bottom ends of the two groups of reset springs are respectively clung to the bottom ends of the two groups of baffles and the top ends of the two groups of supporting plates, a blanking cavity is arranged inside the blanking device, the top end of the blanking cavity is communicated with the bottom end of the limiting pipe, and the inner diameter of the blanking cavity is far larger than the inner diameter of the limiting pipe, the bottom intercommunication in unloading chamber is provided with the feed opening, the rear end left side and the right side of controlling the frame are provided with two sets of connecting rods respectively, the rear end of two sets of connecting rods is connected with the front end outside of two sets of drive poles respectively.

The utility model discloses a food packaging machinery still includes supplementary piece, the bottom of supplementary piece is connected with the bottom in the control chamber of control block, the top of supplementary piece is provided with first protruding cambered surface.

The utility model discloses a food packaging machinery still includes two sets of protection semi-rings, the top of two sets of protection semi-rings is connected with the top front side and the rear side in the control chamber of control block respectively, the lateral wall of two sets of protection semi-rings is provided with the protruding cambered surface of two sets of second.

The utility model discloses a food packaging machine still includes the clear glass board, the front end intercommunication that holds the chamber that holds of case is provided with observes the hole, the top, bottom, left end and the right-hand member of clear glass board respectively with observe top, bottom, left end and the right-hand member fixed connection in hole.

The utility model discloses a food packaging machinery still includes the toper piece, the bottom of toper piece is connected with the top of control block.

The utility model discloses a food packaging machinery still includes the protective cover, the bottom of protective cover is provided with the draw-in groove, the draw-in groove clamps with the top that holds the case.

The utility model discloses a food packaging machine, the circumference lateral wall of controlling the frame is provided with anti-skidding cover.

The utility model discloses a food packaging machine still includes the handle, the bottom of handle is provided with two sets of shadoods, the bottom of two sets of shadoods is connected with the top middle part left side and the right side of protective cover respectively.

Compared with the prior art, the beneficial effects of the utility model are that: firstly, after granular food is filled in a containing box, granular food in the containing box flows into a control cavity of a control block through two groups of inflow holes and fills the control cavity, then a worker sleeves an opening of a plastic packaging bag at the bottom of a feeder, then controls an operation frame to move downwards to drive two groups of driving rods to move downwards, the two groups of driving rods simultaneously drive the control block to move downwards in a limiting pipe, simultaneously the two groups of driving rods respectively extrude two groups of reset springs through two groups of baffles at the top of the two groups of reset rods, when the control block moves downwards to the state that two groups of outflow holes are blocked by the inner side wall of the limiting pipe, the two groups of outflow holes of the control block just enter the feeding cavity of the feeder, then the granular food in the control block quickly flows into the feeder through the two groups of outflow holes and flows into the plastic packaging bag through the feeder, the volume of the control block is specially designed, the amount of granular food contained in the control block is just the required filling amount in the plastic package, after the granular food in the control block completely flows into the plastic package bag, at the moment, a worker stops pressing the control frame, at the moment, two groups of reset springs respectively push two groups of check blocks to move upwards for resetting, at the same time, the two groups of check blocks respectively drive the control block to reset in the limiting pipe through two groups of reset rods and two groups of driving rods, two groups of inflow holes of the control block after resetting are communicated with the containing cavity again, and two groups of outflow holes are blocked by the inner side wall of the limiting pipe, at the moment, a group of food filling process is completed, the filled plastic package bag is sent to a plastic bag sealing mechanism for processing, and therefore, the difficulty of filling the specified amount of granular food into the plastic package bag at one time is reduced by additionally arranging the food filling control device, namely, the food packaging process is simplified, so that the use convenience of the food packaging machine is improved, and the practicability is enhanced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic view of a partially enlarged structure of a;

fig. 3 is a schematic view of a partial enlarged structure of B of the present invention;

fig. 4 is a schematic view of the connection structure of the operation frame and two sets of driving rods of the present invention;

FIG. 5 is a schematic view of the connection structure of two sets of protection semi-rings and control block according to the present invention;

FIG. 6 is a schematic view showing a connection structure between a transparent glass plate and a storage box according to the present invention;

in the drawings, the reference numbers: 1. a containing box; 2. a fixing plate; 3. an operation table; 4. a plastic bag sealing mechanism; 5. a support; 6. a containing cavity; 7. two groups of support rods; 8. a control block; 9. a limiting pipe; 10. two sets of driving rods; 11. two sets of support plates; 12. two sets of reset rods; 13. two groups of reset springs; 14. two sets of baffles; 15. a control frame; 16. a blanking device; 17. a control chamber; 18. Two sets of inflow holes; 19. two sets of outflow holes; 20. two sets of sliding holes; 21. a blanking cavity; 22. An auxiliary block; 23. a first convex arc surface; 24. two groups of protection semi-rings; 25. a transparent glass plate; 26. A tapered block; 27. a protective cover; 28. a card slot; 29. an anti-slip sleeve; 30. a handle.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 6, the food packaging machine of the present invention comprises a plastic bag sealing machine assembly, a containing box 1 and a fixing plate 2, wherein the plastic bag sealing machine assembly is provided with an operating table 3, a plastic bag sealing mechanism 4 and a support 5, the left end of the fixing plate 2 is connected with the right end of the operating table 3, a containing cavity 6 is arranged in the containing box 1, and the top end of the containing cavity 6 is communicated with a material taking port; the device also comprises two groups of supporting rods 7, a control block 8, a limiting pipe 9, two groups of driving rods 10, two groups of supporting plates 11, two groups of reset rods 12, two groups of reset springs 13, two groups of baffle plates 14, a control frame 15 and a feeder 16, wherein the bottom ends of the two groups of supporting rods 7 are respectively connected with the left rear side and the right rear side of the top end of the fixed plate 2, the top ends of the two groups of supporting rods 7 are respectively connected with the left rear side and the right rear side of the bottom end of the containing box 1, the top end of the limiting pipe 9 is communicated with the bottom end of the containing box 1 and is provided with a communication hole, the control block 8 is slidably clamped with the limiting pipe 9, the top end of the control block 8 penetrates through the communication hole from the limiting pipe 9 and extends into the containing cavity 6, a control cavity 17 is arranged inside the control block 8, two groups of inflow holes 18 are respectively arranged on the front side and the rear side of the top end of the control cavity 17 in a penetrating way, two groups of outflow holes 19 are respectively arranged on the front side and the rear side of the bottom end of the control cavity 17 in a penetrating way, the left end and the right end of the inner circumference side wall of the limiting pipe 9 are respectively provided with two groups of sliding holes 20 in a communicating way, the inner ends of two groups of driving rods 10 respectively penetrate through the two groups of sliding holes 20 from the outer side of the limiting pipe 9 and respectively extend into the limiting pipe 9, the inner ends of the two groups of driving rods 10 are respectively connected with the left end and the right end bottom area of the control block 8, the inner ends of two groups of supporting plates 11 are respectively connected with the left end and the right end middle part of the limiting pipe 9, the top ends of the two groups of supporting plates 11 are respectively provided with two groups of telescopic holes in a penetrating way, the two groups of telescopic holes are respectively clamped with the two groups of reset rods 12 in a sliding way, the top ends of the two groups of reset rods 12 are respectively connected with the bottom ends of the two groups of baffles 14, the two groups of reset springs 13 are respectively movably sleeved with the two groups of reset rods 12, the top ends and the bottom ends of the two groups of supporting plates 11, the blanking device 16 is internally provided with a blanking cavity 21 in a tightly clinging way, the top end of the blanking cavity 21 is communicated with the bottom end of the limiting pipe 9, the inner diameter of the blanking cavity 21 is far larger than that of the limiting pipe 9, a blanking port is communicated with the bottom end of the blanking cavity 21, two groups of connecting rods are respectively arranged on the left side and the right side of the rear end of the control frame 15, and the rear ends of the two groups of connecting rods are respectively connected with the outer sides of the front ends of the two groups of driving rods 10; firstly, after granular food is filled in a containing box, granular food in the containing box flows into a control cavity of a control block through two groups of inflow holes and fills the control cavity, then a worker sleeves an opening of a plastic packaging bag at the bottom of a feeder, then controls an operation frame to move downwards to drive two groups of driving rods to move downwards, the two groups of driving rods simultaneously drive the control block to move downwards in a limiting pipe, simultaneously the two groups of driving rods respectively extrude two groups of reset springs through two groups of baffles at the top of the two groups of reset rods, when the control block moves downwards to the state that two groups of outflow holes are blocked by the inner side wall of the limiting pipe, the two groups of outflow holes of the control block just enter the feeding cavity of the feeder, then the granular food in the control block quickly flows into the feeder through the two groups of outflow holes and flows into the plastic packaging bag through the feeder, the volume of the control block is specially designed, the amount of granular food contained in the control block is just the required filling amount in the plastic package, after the granular food in the control block completely flows into the plastic package bag, at the moment, a worker stops pressing the control frame, at the moment, two groups of reset springs respectively push two groups of check blocks to move upwards for resetting, at the same time, the two groups of check blocks respectively drive the control block to reset in the limiting pipe through two groups of reset rods and two groups of driving rods, two groups of inflow holes of the control block after resetting are communicated with the containing cavity again, and two groups of outflow holes are blocked by the inner side wall of the limiting pipe, at the moment, a group of food filling process is completed, the filled plastic package bag is sent to a plastic bag sealing mechanism for processing, and therefore, the difficulty of filling the specified amount of granular food into the plastic package bag at one time is reduced by additionally arranging the, namely, the food packaging process is simplified, so that the use convenience of the food packaging machine is improved, and the practicability is enhanced.

The utility model discloses a food packaging machine, still include the auxiliary block 22, the bottom of the auxiliary block 22 is connected with the bottom of the control chamber 17 of the control block 8, the top of the auxiliary block 22 is provided with the first convex cambered surface 23; the blanking of granular food in the control cavity is smoother through the first convex cambered surface at the top of the auxiliary block, the phenomenon of incomplete blanking of food in the control cavity is effectively reduced, and therefore the reliability is enhanced.

The utility model discloses a food packaging machine, still include two sets of protection semi-rings 24, the top of two sets of protection semi-rings 24 is connected with the top front side and the rear side of the control chamber 17 of control block 8 respectively, the lateral wall of two sets of protection semi-rings 24 is provided with two sets of second convex cambered surfaces; when the control block moves down and stretches into the spacing pipe and moves, the two groups of second convex arcs outside the two groups of protection semi-rings have the pushing effect on granular food, so that the probability that half of the granular food in the control cavity is crushed is effectively reduced, and the probability that half of the granular food in the containing cavity is crushed is reduced, and the practicability is enhanced.

The utility model discloses a food packaging machine, still include the transparent glass board 25, the front end intercommunication of the holding chamber 6 of holding case 1 is provided with the observation hole, the top, bottom, left end and the right-hand member of transparent glass board 25 respectively with the top, bottom, left end and the right-hand member fixed connection of observation hole; make the observation of holding the food volume of incasement more convenient through the transparent glass board, for holding incasement feed supplement and providing convenience to the convenience has been strengthened.

The food packaging machine of the utility model also comprises a conical block 26, the bottom end of the conical block 26 is connected with the top end of the control block 8; because the top of tapered block is pointed, consequently very big increase the control block to the pressure that holds bottom of the case portion food, reduce the resistance that resets of control block holding the chamber bottom, make the more comfortable that resets of control block, thereby strengthened the practicality.

The food packaging machine of the utility model also comprises a protective cover 27, the bottom end of the protective cover 27 is provided with a clamping groove 28, and the clamping groove 28 is clamped with the top of the containing box 1; through with the protective cover lid at the top of containing the meal case, the effectual probability that has reduced debris and fall into to holding the incasement to the practicality has been strengthened.

In the food packaging machine of the utility model, the circumferential side wall of the control frame 15 is provided with an anti-skid sleeve 29; the friction coefficient of the control frame is increased through the anti-skidding sleeve, the probability that a worker operates the wiping frame and slips on the control frame is effectively reduced, and therefore practicability is enhanced.

The food packaging machine of the utility model also comprises a handle 30, two groups of lifting rods are arranged at the bottom end of the handle 30, and the bottom ends of the two groups of lifting rods are respectively connected with the left side and the right side of the middle part of the top end of the protective cover 27; the handle facilitates the opening and closing operation of the protective cover, thereby enhancing the practicability.

The utility model discloses a food packaging machine, when it works, firstly, after the containing box is filled with granular food, at this time, the granular food in the containing box can flow into the control cavity of the control block through two sets of inflow holes, and the control cavity is filled, then the worker sleeves the opening of the plastic packaging bag at the bottom of the discharging device, then the control frame is controlled to move down to drive the two sets of driving rods to move down, at this time, the two sets of driving rods simultaneously drive the control block to move down in the limiting pipe, simultaneously, the two sets of driving rods respectively extrude two sets of reset springs through two sets of baffles at the top of the two sets of reset rods, when the control block moves down to the inner side wall of the limiting pipe of the two sets of outflow holes, at this time, the two sets of outflow holes of the control block just enter into the discharging cavity of the discharging device, then the granular food in the control block quickly flows into the discharging device through the two sets of outflow holes, and flows into the plastic packaging bag through the blanking device, the volume of the control block is specially designed, the amount of the granular food contained in the plastic packing bag is just the required filling amount in the plastic packing bag, after the granular food in the block to be controlled completely flows into the plastic packing bag, at the moment, the operator stops pressing the control frame, at the moment, the two groups of return springs respectively push the two groups of stop blocks to move upwards for return, meanwhile, the two groups of check blocks drive the control block to reset in the limiting pipe through the two groups of reset rods and the two groups of driving rods respectively, two groups of inflow holes of the control block after resetting are communicated with the containing cavity again, and the two groups of outflow holes are blocked by the inner side walls of the limiting pipes, so that a group of food filling process is completed, the plastic packaging bag filled with granular food is taken to the plastic bag sealing machine component, and the plastic bag is filled with air and sealed by the plastic bag sealing mechanism.

The terms "front", "rear", "left", "right" and the like as used herein are for illustrative purposes only.

In the present invention, "first", "second" and "third" do not represent specific quantities or sequences, but are merely used for distinguishing names.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A food packaging machine comprises a plastic bag sealing machine assembly, a containing box (1) and a fixing plate (2), wherein the plastic bag sealing machine assembly is provided with an operating table (3), a plastic bag sealing mechanism (4) and a support (5), the left end of the fixing plate (2) is connected with the right end of the operating table (3), a containing cavity (6) is arranged in the containing box (1), and the top end of the containing cavity (6) is communicated with a material taking port; characterized by also comprising two groups of supporting rods (7), a control block (8), a limiting pipe (9), two groups of driving rods (10), two groups of supporting plates (11), two groups of reset rods (12), two groups of reset springs (13), two groups of baffle plates (14), a control frame (15) and a feeder (16), wherein the bottom ends of the two groups of supporting rods (7) are respectively connected with the left rear side and the right rear side of the top end of the fixing plate (2), the top ends of the two groups of supporting rods (7) are respectively connected with the left rear side and the right rear side of the bottom end of the containing box (1), the top end of the limiting pipe (9) is communicated with the bottom end of the containing box (1) and is provided with a communicating hole, the control block (8) is slidably clamped with the limiting pipe (9), the top end of the control block (8) penetrates through the communicating hole from the inside of the limiting pipe (9) and extends into the containing cavity (6), and a control cavity (17) is arranged inside the control block (8), the front side and the rear side of the top end of the control cavity (17) are respectively provided with two groups of inflow holes (18) in a penetrating manner, the front side and the rear side of the bottom end of the control cavity (17) are respectively provided with two groups of outflow holes (19) in a penetrating manner, the bottom areas of the left end and the right end of the inner circumferential side wall of the limiting pipe (9) are respectively provided with two groups of sliding holes (20) in a communicating manner, the inner ends of the two groups of driving rods (10) respectively penetrate through the two groups of sliding holes (20) from the outer side of the limiting pipe (9) and respectively extend into the limiting pipe (9), the inner ends of the two groups of driving rods (10) are respectively connected with the bottom areas of the left end and the right end of the control block (8), the inner ends of the two groups of supporting plates (11) are respectively connected with the middle parts of the left end and the right end of the limiting pipe (9), the top ends of the two groups of supporting plates (11) are respectively provided with two groups of telescopic holes in a penetrating manner, and the two groups of telescopic holes are respectively clamped with the reset rod (12) in a sliding manner, the top of two sets of release link (12) is connected with the bottom of two sets of baffles (14) respectively, two sets of reset spring (13) are hugged closely with the top of two sets of release link (12) activity suit respectively, the top and the bottom of two sets of reset spring (13) are respectively with the bottom of two sets of baffles (14) and the top of two sets of backup pad (11), the inside of glassware (16) down is provided with unloading chamber (21), the top of unloading chamber (21) and the bottom intercommunication of spacing pipe (9), the internal diameter in unloading chamber (21) is far greater than the internal diameter of spacing pipe (9), the bottom intercommunication in unloading chamber (21) is provided with the feed opening, the rear end left side and the right side of controlling frame (15) are provided with two sets of connecting rods respectively, the rear end of two sets of connecting rods is connected with the front end outside of two sets of drive bars (10) respectively.

2. The food packaging machine according to claim 1, further comprising an auxiliary block (22), wherein the bottom end of the auxiliary block (22) is connected to the bottom end of the control chamber (17) of the control block (8), and the top end of the auxiliary block (22) is provided with a first convex arc surface (23).

3. The food packaging machine according to claim 2, characterized by further comprising two sets of protection half rings (24), wherein the top ends of the two sets of protection half rings (24) are respectively connected with the front side and the rear side of the top end of the control cavity (17) of the control block (8), and the outer side walls of the two sets of protection half rings (24) are provided with two sets of second convex arc surfaces.

4. The food packaging machine according to claim 3, further comprising a transparent glass plate (25), wherein the front end of the containing cavity (6) of the containing box (1) is provided with a viewing hole, and the top end, the bottom end, the left end and the right end of the transparent glass plate (25) are fixedly connected with the top end, the bottom end, the left end and the right end of the viewing hole respectively.

5. The food packaging machine according to claim 4, characterized in that it further comprises a conical block (26), the bottom end of said conical block (26) being connected to the top end of the control block (8).

6. The food packaging machine according to claim 5, characterized by further comprising a protective cover (27), wherein a bottom end of the protective cover (27) is provided with a slot (28), and the slot (28) is clamped with the top of the containing box (1).

7. The food packaging machine according to claim 6, characterized in that the circumferential side wall of said handling frame (15) is provided with anti-slip sleeves (29).

8. The food packaging machine according to claim 7, further comprising a handle (30), wherein two sets of lifting bars are provided at the bottom ends of the handle (30), and the bottom ends of the two sets of lifting bars are respectively connected with the left side and the right side of the top middle portion of the protecting cover (27).