Disclosure of Invention
In order to overcome the defects that when people place a notebook computer on an office table, a person who is higher in children can look at the screen of the notebook computer directly by lowering his head, and the notebook computer cannot be suitable for people with different heights, the technical problem to be solved is as follows: the open-cover type notebook computer lifting table can adjust the height of a notebook computer and is suitable for people with different heights.
The technical implementation scheme of the invention is as follows: an open cover type notebook computer lifting table comprises a bottom plate, wherein a table is arranged on the bottom plate; a motor bolted within the table; the first gear is arranged on an output shaft of the motor; the cover opening assembly is arranged in the table; the transmission assembly is arranged in the table; the placing plate is connected to the transmission assembly, the transmission assembly is used for lifting the placing plate, and the uncovering assembly is used for protecting the placing plate; and the falling prevention assembly is arranged in the table and is used for blocking the uncovering assembly.
Further, the cover opening assembly comprises a first rack, a first slide rail, a first slide block, a sector gear, a second slide block, a connecting rod, a support frame, a first guide rod, a third slide block, a first push block, a first spring, a second slide rail, a connecting frame, a roller, a cover plate, a contact block, a first fixed block, a second spring and a second push block, wherein the first rack is arranged in a table close to one side of the motor in a sliding manner, the first rack is meshed with the first gear, the first slide rail is fixedly connected in the table close to one side of the motor, a first chute extending along the horizontal direction is arranged on the side surface of the first slide rail, the first slide block and the second slide block are arranged in the first slide rail in a sliding manner, the sector gear is rotatably mounted on the first slide block, the sector gear is meshed with the first rack, the connecting rod is fixedly connected in the second slide block in a penetrating manner, the connecting rod is rotatably connected on the, the end part of the connecting rod is connected with the sector gear, the top part in the table is bolted with a support frame and at least two second slide rails, a first guide rod is installed in the support frame, a third slide block is sleeved on the first guide rod in a sliding way, the connecting rod penetrates through the first slide groove and is fixedly connected with the third slide block, a groove is formed in the third slide block, a first push block is arranged on the inner side of the table between the support frame and the second slide rails in a sliding way, a first spring is connected between the first push block and the inner wall of the table, at least two connecting frames are fixedly connected to the lower side of the cover plate, a roller wheel is rotatably installed on each connecting frame and is in sliding fit with the second slide rails, one connecting frame is inserted into the groove, a contact block is arranged in the table in a sliding way, a first fixed block is fixedly connected in the table, and a second spring is, and the lower part of the first rack is connected with a second push block for pushing the contact block.
Further, the transmission assembly comprises a transmission wheel, a spline shaft, a belt, a first sliding sleeve, a clamping block, a bidirectional screw rod, a clamping sleeve, nuts, second guide rods, a second sliding sleeve and a lifting frame, the bidirectional screw rod is installed in the table in a rotary mode, the clamping sleeve is fixedly connected to the end portion of the bidirectional screw rod, at least two nuts are screwed on the bidirectional screw rod, at least two second guide rods are fixedly connected to the table, the bidirectional screw rod is located between the second guide rods, at least two second sliding sleeves are slidably sleeved on the second guide rods and fixedly connected with the nuts, the lifting frame is arranged on the second sliding sleeves, the placing plate is rotatably connected to the lifting frame, the spline shaft is rotatably installed in the table close to one side of the clamping sleeve, the transmission wheel is fixedly sleeved on the spline shaft, the transmission wheel is fixedly sleeved on the output shaft of the motor, and the belt, the spline shaft is sleeved with a first sliding sleeve in a sliding mode, and the first sliding sleeve is fixedly sleeved with a clamping block.
Further, the anti-falling assembly comprises a second rack, a second gear, a first sliding rod, a circular block, a third spring, a clamping rod, a third pushing block, a second fixed block, a second sliding rod, a push rod, a fourth spring, a third rack and a guide sleeve, the first sliding rod is slidably sleeved in the table, the third pushing block is fixedly connected to one end of the first sliding rod, the circular block is fixedly connected to the other end of the first sliding rod, the third spring is connected between the circular block and the table, the third spring is wound on the first sliding rod, the clamping rod used for blocking the first rack is fixedly connected to the circular block on one side of the first rack, a second sliding groove extending in the vertical direction is formed in the first rack, the clamping rod is located in the second sliding groove, the second sliding sleeve on one side of the third pushing block is fixedly connected with the second rack, a second guide rod on one side of the third pushing block is rotatably mounted on a second guide rod close to one side of the third pushing block, the uide bushing rigid coupling in be close to the desk inner wall of third ejector pad one side, the second slide bar has been worn in the sliding of uide bushing, the tip rigid coupling of second slide bar has the third rack, third rack and second gear engagement, the fixed push rod that has cup jointed on the second slide bar, push rod and third ejector pad contact, sliding sleeve is equipped with the second fixed block on the second slide bar, be connected with the fourth spring between second fixed block and the push rod, the fourth spring is around establishing on the second slide bar, the through-hole has been seted up in the desk, second fixed block rigid coupling is in the through-hole.
Further, the table comprises a fourth rack, a third gear, a guide sleeve, a pushing frame, a fifth rack, a pressure rod, a third sliding rod, a wedge block, a fourth pushing block and a fifth spring, the fourth rack is fixedly connected to the first rack far away from one side of the second sliding groove, the third gear is rotatably mounted at the top of the table, the guide sleeve is fixedly connected to the inner wall of the table, the pushing frame penetrates through the guide sleeve in the sliding manner, the pushing frame is n-shaped, the fifth rack is fixedly connected to the pushing frame, the fifth rack is meshed with the third gear, the pressure rod is fixedly connected to the pushing frame far away from one side of the fifth rack, the third sliding rod penetrates through the table right above the clamping sleeve in the sliding manner, the wedge block is fixedly connected to the end portion of the third sliding rod, the fourth pushing block is fixedly connected to the third sliding rod in the sliding manner, the fourth pushing block is rotatably connected with the first sliding sleeve, and the fifth spring is connected between the fourth pushing block and the inner, and the fifth spring is wound on the third sliding rod.
Furthermore, the device also comprises a baffle plate, and the lower side of the placing plate is fixedly connected with the baffle plate.
Compared with the prior art, the invention has the following advantages:
1. can drive transmission assembly work through the motor, adjust the height of placing the board, so, can freely adjust notebook computer's height to can be applicable to the crowd of different heights.
2. Through the effect of fourth rack and fourth ejector pad, can be with placing the higher that the board rose to can be applicable to the crowd of more different heights.
3. Through the action of the baffle, articles can be prevented from falling down from the opening on the desk.
Drawings
Fig. 1 is a schematic front perspective view of the present invention.
FIG. 2 is a schematic view of a first partial body structure according to the present invention.
Fig. 3 is an enlarged schematic view of part a of the present invention.
FIG. 4 is a schematic view of a second partial body structure according to the present invention.
Fig. 5 is a partial perspective view of the transmission assembly of the present invention.
Fig. 6 is a perspective view of a third embodiment of the present invention.
Fig. 7 is a schematic diagram of the popping structure of the present invention.
Fig. 8 is a perspective view of another embodiment of the present invention.
Fig. 9 is an enlarged schematic view of part B of the present invention.
Fig. 10 is a perspective view of a fourth embodiment of the present invention.
In the reference symbols: 1 bottom plate, 2 table, 3 motor, 4 first gear, 5 cover-opening component, 501 first rack, 502 first slide rail, 503 first slide groove, 504 first slide block, 505 sector gear, 506 second slide block, 507 connecting rod, 508 connecting rod, 509 support, 510 first guide rod, 511 third slide block, 512 groove, 513 first push block, 514 first spring, 515 second slide rail, 516 connecting frame, 517 roller, 518 cover plate, 519 contact block, 520 first fixed block, 521 second spring, 522 second push block, 6 transmission component, 601 transmission wheel, 602 spline shaft, 603 belt, 604 first slide sleeve, 605 fixture block, 606 two-way screw rod, 607 ferrule, 608 nut, 609 second guide rod, 610 second slide sleeve, 611 crane, 7 placing plate, 8 anti-falling component, 801 second rack, 802 second gear, 803 first slide rod, 804 circular block, 805 third spring, 806 fixture rod, 807 second slide groove 808, third push block, 809 through holes, 810 a second fixed block, 811 a second sliding rod, 812 a push rod, 813 a fourth spring, 814 a third rack, 815 a guide sleeve, 9 a fourth rack, 10 a third gear, 101 a guide sleeve, 11 a push frame, 12 a fifth rack, 13 a pressure bar, 14 a third sliding rod, 15 a wedge block, 16 a fourth push block, 17 a fifth spring and 18 a baffle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The utility model provides an uncap formula notebook computer lift table, as shown in fig. 1-10, including bottom plate 1, desk 2, motor 3, first gear 4, subassembly 5, drive assembly 6, place board 7 and prevent falling subassembly 8 uncaps, desk 2 is installed at bottom plate 1 top, motor 3 is installed through the bolt in the desk 2 left side, there is first gear 4 through the key connection on the output shaft of motor 3, install subassembly 5, drive assembly 6 and prevent falling subassembly 8 uncaps in the desk 2, be connected with on the drive assembly 6 and place board 7.
The cover opening assembly 5 comprises a first rack 501, a first slide rail 502, a first slide block 504, a sector gear 505, a second slide block 506, a connecting rod 507, a connecting rod 508, a supporting frame 509, a first guide rod 510, a third slide block 511, a first push block 513, a first spring 514, a second slide rail 515, a connecting frame 516, a roller 517, a cover plate 518, a contact block 519, a first fixed block 520, a second spring 521 and a second push block 522, wherein the left side in the table 2 is provided with the first rack 501 and the contact block 519 in a sliding manner through a guide rail and a guide sleeve, the contact block 519 is positioned at the front side of the first rack 501, the first rack 501 is meshed with the first gear 4, the left side in the table 2 is provided with the first slide rail 502 through a bolt, the left side of the first slide rail 502 is provided with a first sliding groove 503, the first slide block 504 and the second slide block 506 are arranged in the first slide rail 502 in a sliding manner, the first slide block 504 is positioned below the second slide block 506, a sector gear 505 is engaged with the first rack 501, a connecting rod 507 is connected in the second sliding block 506, the connecting rod 507 is rotatably connected with a connecting rod 508, the end of the connecting rod 508 is connected with the sector gear 505, a supporting frame 509 and two second sliding rails 515 are bolted on the top of the table 2, a first guide rod 510 is installed in the supporting frame 509, a third sliding block 511 is slidably sleeved on the first guide rod 510, the connecting rod 507 penetrates through the first sliding groove 503 and is connected with the left side of the third sliding block 511, a groove 512 is formed in the third sliding block 511, a first push block 513 is slidably arranged on the left side of the top of the table 2, the first push block 513 is located between the supporting frame 509 and the second sliding rails 515, a first spring 514 is connected between the first push block 513 and the top of the table 2, connecting frames 516 are connected on the left and right sides of the bottom of the cover plate 518, rollers 517 are rotatably installed on the connecting frames 516, and the, the connecting frame 516 on the left side is inserted into the groove 512, the first fixing block 520 is connected to the left side in the table 2, the first fixing block 520 is located above the contact block 519, the second spring 521 is connected between the first fixing block 520 and the contact block 519, and the second push block 522 is connected to the lower portion of the front side of the first rack 501.
The transmission assembly 6 comprises a transmission wheel 601, a spline shaft 602, a belt 603, a first sliding sleeve 604, a fixture block 605, a bidirectional screw 606, a clamping sleeve 607, a nut 608, a second guide rod 609, a second sliding sleeve 610 and a lifting frame 611, the bidirectional screw 606 and the two second guide rods 609 are rotatably installed at the upper part in the table 2, the bidirectional screw 606 is positioned between the two second guide rods 609, the clamping sleeve 607 is connected at the left end of the bidirectional screw 606, the two nuts 608 are screwed on the bidirectional screw 606, the two second sliding sleeves 610 are both slidably arranged on the two second guide rods 609, the left second sliding sleeve 610 is connected with the left nut 608 through a rod, the right second sliding sleeve 610 is connected with the right nut 608 through a rod, the tops of the four second sliding sleeves 610 are rotatably connected with the lifting frame 611, the placing plate 7 is rotatably connected with the top of the lifting frame 611, the left side in the table 2 is, a spline shaft 602 is rotatably mounted on the shaft, driving wheels 601 are mounted on the spline shaft 602, driving wheels 601 are also mounted on an output shaft of the motor 3, a belt 603 is wound between the two driving wheels 601, a first sliding sleeve 604 is slidably mounted on the spline shaft 602, and a clamping block 605 is connected on the first sliding sleeve 604.
The falling-preventing assembly 8 comprises a second rack 801, a second gear 802, a first sliding rod 803, a circular block 804, a third spring 805, a clamping rod 806, a third pushing block 808, a second fixed block 810, a second sliding rod 811, a pushing rod 812, a fourth spring 813, a third rack 814 and a guide sleeve 815, wherein a sliding hole is formed in the left side of the table 2, the first sliding rod 803 is arranged in the sliding hole in a sliding manner, the third pushing block 808 is connected to the right end of the first sliding rod 803, the circular block 804 is connected to the left end of the first sliding rod 803, the third spring 805 is connected between the circular block 804 and the table 2, the third spring 805 is wound on the first sliding rod 803, the clamping rod 806 is connected to the middle of the left side of the circular block 804, the second sliding groove 807 is formed in the right side of the first rack 501, the clamping rod 806 is inserted into the second sliding groove 807, the second rack 801 is installed in the front side of the second sliding sleeve 610 in the front side in the left side, a rod 609 in the front side is connected to a rod 501 in, a rod is connected to the left side in the table 2, a guide sleeve 815 is connected to the rod, a second sliding rod 811 is arranged in the guide sleeve 815 in an inward sliding mode, a third rack 814 is connected to the right end of the second sliding rod 811, the third rack 814 is meshed with a second gear 802, a push rod 812 is connected to the middle of the second sliding rod 811, the push rod 812 is in contact with a third push block 808, a second fixed block 810 is arranged on the second sliding rod 811 in a sliding mode, a fourth spring 813 is connected between the second fixed block 810 and the push rod 812, the fourth spring 813 is wound on the second sliding rod 811, a through hole 809 is formed in the table 2, and the second fixed block 810 is connected into the through hole 809.
People start the motor 3 to rotate anticlockwise, the motor 3 drives the first gear 4 to rotate anticlockwise, the first gear 4 drives the uncovering component 5 to open, after the uncovering component 5 is opened, the uncovering component 5 is separated from the first gear 4, the uncovering component 5 can be blocked by the anti-falling component 8, the motor 3 can drive the transmission component 6 to work, the transmission component 6 drives the placing plate 7 to move upwards, the placing plate 7 is lifted, the placing plate 7 is adjusted to a proper height, after the adjustment is finished, people close the motor 3, then a notebook computer is placed on the placing plate 7, if the position of the placing plate 7 needs to be heightened, people start the motor 3 to rotate anticlockwise again, the motor 3 drives the placing plate 7 to move upwards, when the placing plate 7 moves upwards to a proper height, people close the motor 3, if the position of the placing plate 7 needs to be lowered, people start the motor 3 to rotate clockwise, motor 3 drive assembly 6 work, and drive assembly 6 drives places board 7 downstream, and when placing board 7 downstream to suitable height, people closed motor 3, so, can freely adjust notebook computer's height to can be applicable to the crowd of different heights.
Initially, the first spring 514 is in a compressed state. People start the motor 3 to rotate anticlockwise, the motor 3 drives the first gear 4 to rotate anticlockwise so as to drive the first rack 501 to move upwards, the second slider 506 is driven to move backwards through the sector gear 505 and the connecting rod 508 so as to drive the connecting rod 507 to move backwards, the first push block 513 moves backwards under the action of the first spring 514, the first push block 513 pushes the connecting rod 507 to move backwards so as to avoid the connecting rod 507 from being blocked, the connecting rod 507 moves backwards so as to drive the third slider 511 to move backwards so as to drive the connecting frame 516 to move backwards, so as to drive the roller 517 and the cover plate 518 to move backwards, the roller 517 is guided by the second sliding rail 515, so that the roller 517 moves backwards continuously after moving upwards for a certain distance, so as to drive the cover plate 518 to move backwards continuously after moving upwards for a certain distance, so as to avoid the cover plate 518 from colliding with the table 2, the first rack 501 also can drive the second push block 522 to move upwards, when the second push block 522 moves upwards and touches the contact block 519, the second push block 522 pushes the contact block 519 to move upwards, the second spring 521 is compressed, when the first rack 501 moves upwards and is not meshed with the first gear 4, the falling-prevention assembly 8 blocks the first rack 501, so that the first rack 501 cannot move downwards, at the moment, the cover plate 518 is opened, and the cover plate 518 cannot be closed because the first rack 501 is not meshed with the first gear 4, so that the height of the placing plate 7 can be adjusted at will. When the cover plate 518 needs to be closed, a user starts the motor 3 to rotate clockwise, the motor 3 drives the transmission assembly 6 to work, the transmission assembly 6 drives the placing plate 7 to move downwards, the placing plate 7 moves downwards into the table 2, the transmission assembly 6 drives the anti-falling assembly 8 to work, the anti-falling assembly 8 does not block the first rack 501 any more, under the action of the second spring 521, the contact block 519 moves downwards, the contact block 519 pushes the second push block 522 to move downwards, the second push block 522 drives the first rack 501 to move downwards to be meshed with the first gear 4, the first gear 4 drives the first rack 501 to move downwards, the second slide block 506 is driven to move forwards through the sector gear 505 and the connecting rod 508, so that the connecting rod 507 is driven to move forwards, the cover plate 518 is driven to move forwards, when the connecting rod 507 moves forwards to touch the first push block 513, the first spring 514 is compressed, the roller 517 is guided by the second slide rail 515, so that the roller 517 moves downward and can drive the cover 518 to move downward, and the cover 518 moves to the initial position, and people can turn off the motor 3.
People push the fixture block 605 rightwards to push the fixture block 605 into the clamping sleeve 607, then the motor 3 is started to rotate anticlockwise, the motor 3 drives the driving wheel 601 at the front side to rotate anticlockwise, the belt 603 drives the driving wheel 601 at the rear side to rotate anticlockwise, so as to drive the spline shaft 602 to rotate anticlockwise, further drive the first sliding sleeve 604 to rotate anticlockwise, the fixture block 605 and the clamping sleeve 607 drive the two-way screw rod 606 to rotate, so as to drive the nut 608 to move inwards, further drive the second sliding sleeve 610 to move inwards, drive the placing plate 7 to move upwards through the lifting frame 611, when the placing plate 7 moves upwards to a proper height, people close the motor 3, if the position of the placing plate 7 needs to be lowered, people start the motor 3 to rotate clockwise, the motor 3 drives the driving wheel 601 at the front side to rotate clockwise, the belt 603 drives the driving wheel 601 at the rear side to rotate clockwise, so as to, and then drive first sliding sleeve 604 and rotate clockwise, drive two-way lead screw 606 through fixture block 605 and cutting ferrule 607 and rotate to drive nut 608 outwards to remove, and then drive second sliding sleeve 610 outwards and remove, drive through crane 611 and place board 7 and remove downwards, when placing board 7 and remove downwards to suitable height, people close motor 3.
Initially, the third spring 805 is in a compressed state. When the motor 3 rotates counterclockwise, the motor 3 drives the second sliding sleeve 610 to move inward, the second sliding sleeve 610 at the front left side moves rightward, and drives the second rack 801 to move rightward, when the second rack 801 moves rightward to engage with the second gear 802, the second rack 801 drives the second gear 802 to rotate clockwise, the second gear 802 drives the third rack 814 to move leftward, so as to drive the push rod 812 to move leftward without contacting with the third push block 808, the fourth spring 813 is compressed, when the first rack 501 moves upward, the blocking rod 806 slides in the second sliding slot 807, when the blocking rod 806 moves out of the second sliding slot 807, under the action of the third spring 805, the circular block 804 moves leftward, the blocking rod 806 moves leftward accordingly to block the first rack 501, so that the first rack 501 cannot move downward, when the second rack 801 does not engage with the second gear 802, the third push block 808 blocks the push rod 812 when moving rightward, the third rack 814 is not moved to the right, and at this time, the first rack 501 is not engaged with the first gear 4, the cover 518 is opened, and the placing plate 7 is just moved out of the table 2, so that the cover 518 is not moved regardless of whether the motor 3 rotates counterclockwise or clockwise, and the height of the placing plate 7 can be adjusted at will. When the use is not needed, people start the motor 3 to rotate clockwise, the motor 3 drives the second sliding sleeve 610 to move outwards, the second sliding sleeve 610 at the front left side moves leftwards to drive the second rack 801 to move leftwards, the second rack 801 drives the second gear 802 to rotate anticlockwise, the second gear 802 drives the third rack 814 to move rightwards, so as to drive the push rod 812 to move rightwards, the push rod 812 pushes the third push block 808 to move rightwards, so as to drive the first slide bar 803 to move rightwards, so as to drive the circular block 804 to move rightwards, the blocking rod 806 moves rightwards along with the movement, the third spring 805 is compressed, when the blocking rod 806 moves rightwards and does not block the first rack 501 any more, under the action of the second spring 521, the contact block 519 moves downwards, the contact block 519 pushes the second push block 522 to move downwards, the second push block 522 drives the first rack 501 to move downwards to be meshed with the first gear 4, the first rack 501 is driven by the first gear 4, thereby enabling the cover 518 to be reset and one can turn off the motor 3 when the cover 518 is reset.
Example 2
On the basis of embodiment 1, as shown in fig. 1 to 4, the desk further comprises a fourth rack 9, a third gear 10, a guide sleeve 101, a pushing frame 11, a fifth rack 12, a pressure bar 13, a third sliding bar 14, a wedge block 15, a fourth pushing block 16 and a fifth spring 17, the fourth rack 9 is installed on the upper portion of the left side of the first rack 501, the left side of the top of the desk 2 is connected with a rod, the bottom end of the rod is rotatably installed with the third gear 10, the upper portion of the left side of the desk 2 is connected with the guide sleeve 101 through a rod, the rod is L-shaped, the pushing frame 11 is arranged in the guide sleeve 101 in a sliding manner, the pushing frame 11 is n-shaped, the top end of the pushing frame 11 is connected with the fifth rack 12, the fifth rack 12 is engaged with the third gear 10, the rear end of the pushing frame 11 is connected with the pressure bar 13, a hole is formed in the left side of the desk 2, a third sliding bar 14 is arranged in the, the left end of the third sliding rod 14 is connected with a wedge block 15, the left part of the third sliding rod 14 is connected with a fourth pushing block 16, the fourth pushing block 16 is rotatably connected with the first sliding sleeve 604, a fifth spring 17 is connected between the fourth pushing block 16 and the inner wall of the table 2, and the fifth spring 17 is wound on the third sliding rod 14.
The device also comprises a baffle plate 18, and the bottom of the placing plate 7 is connected with the baffle plate 18.
When the motor 3 rotates counterclockwise, the fixture block 605 is driven to rotate counterclockwise and can drive the first rack 501 to move upward, the first rack 501 drives the cover plate 518 to open, at this time, the fixture block 605 does not move into the sleeve 607, so the fixture block 605 does not drive the sleeve 607 to rotate counterclockwise, the placing plate 7 does not move upward, the first rack 501 can also drive the fourth rack 9 to move upward, when the fourth rack 9 moves upward and is engaged with the third gear 10, the fourth rack 9 drives the third gear 10 to rotate counterclockwise, the third gear 10 drives the fifth rack 12 to move downward, so as to drive the pushing frame 11 to move downward, the pressing rod 13 moves downward, when the pressing rod 13 moves downward and contacts with the wedge block 15, the pressing rod 13 pushes the wedge block 15 to move rightward, so as to drive the third sliding rod 14 and the fourth pushing block 16 to move rightward, the fifth spring 17 is compressed, the fourth pushing block 16 drives the first sliding sleeve 604 to move rightward, thereby driving the fixture block 605 to move rightwards, so that the fixture block 605 moves into the clamping sleeve 607, the fixture block 605 drives the clamping sleeve 607 to rotate anticlockwise, and the placing plate 7 is driven to move upwards. When the motor 3 rotates clockwise, because the clamping rod 806 blocks the first rack 501, the first rack 501 does not move downward, and also does not drive the third gear 10 to rotate clockwise, the clamping block 605 does not move out of the clamping sleeve 607, but the motor 3 drives the placing plate 7 to move downward, so that the placing plate 7 moves into the table 2 first, and the cover plate 518 is prevented from touching the placing plate 7, when the clamping rod 806 does not block the first rack 501 any more, the first rack 501 moves downward, the cover plate 518 is driven to close, the first rack 501 can also drive the fourth rack 9 to move downward, so as to drive the third gear 10 to rotate clockwise, so as to drive the fifth rack 12 to move upward, the wedge block 15 moves upward, under the action of the fifth spring 17, the fourth push block 16 and the wedge block 15 move leftward, the fourth push block 16 drives the first sliding sleeve 604 to move leftward, so as to drive the clamping block 605 to move leftward, so as to move the clamping block 605 out of the clamping sleeve 607, at this point, the cover 518 has been closed.
The blocking plate 18 may block items on the table 2 from falling through the opening in the table 2.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.