CN212415142U - Steel-plastic desk convenient to lift - Google Patents

Abstract

The utility model relates to a steel-plastic desk convenient to lift, which relates to the field of desk and chair products, and comprises a desktop and a base, wherein a lifting outer tube and a lifting inner tube which are slidably inserted and sleeved together are arranged between the base and the desktop; be fixed with spacing backup pad on the base, spacing backup pad both sides all are provided with a plurality of location ratchets along length direction, and the one end that the base was kept away from to spacing backup pad is worn to locate in the lift, intraductal both sides equal elasticity in spacing backup pad in the lift be provided with location ratchet joint complex reference column. To the comparatively inconvenient problem of current desk altitude mixture control, the utility model discloses the convenient effect of desk altitude mixture control has.

Description

Steel-plastic desk convenient to lift

Technical Field

The utility model belongs to the technical field of table chair product and specifically relates to a desk is moulded to steel convenient to go up and down is related to.

Background

The height of table chair can exert an influence to user's position of sitting, and the improper table chair of height can make the student nourish improper position of sitting, causes the student to appear near-sighted, hunchback scheduling problem easily, uses the table chair of height-adjustable often in present school to adapt to different grade student's height.

An existing student desk, such as a desk disclosed in patent publication No. CN104223779A, includes a desk body and a lifting device, the desk body is fixed on the top of the lifting device, the lifting device includes 2 support tubes and 2 adjusting tubes, the support tubes are L-shaped, one end of each support tube is fixed on the bottom surface of the desk body, and the other end of each support tube is inserted into the adjusting tube; the outer wall of the adjusting pipe is provided with an adjusting screw which can be inserted and fixed inwards, the bottom of the adjusting pipe is provided with a pedal base, the pedal base of 2 adjusting pipes is provided with a pedal guardrail, and the pedal guardrail is of a horizontal arc structure; the bottom of the adjusting pipe is horizontally connected with a table corner steel pipe, and two ends of the table corner steel pipe are respectively provided with a foot sleeve.

The above prior art solutions have the following drawbacks: when the height of the desk is adjusted, the adjusting screw needs to be unscrewed, and due to the dead weight of the upper half part of the desk, the upper half part of the desk can fall downwards after the adjusting screw is unscrewed, people often need to lift the upper half part of the desk, so that the adjustment is inconvenient, and improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a desk is moulded to steel convenient to go up and down has the advantage of conveniently adjusting the desk height to the not enough of prior art existence, the utility model aims at providing a desk is moulded to steel convenient to go up and down.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a steel-plastic desk convenient to lift comprises a desktop and a base, and is characterized in that a lifting outer tube and a lifting inner tube which are slidably inserted and sleeved together are arranged between the base and the desktop;

the base is fixedly provided with a limiting supporting plate, a plurality of positioning ratchets are arranged on two sides of the limiting supporting plate along the length direction, one end, far away from the base, of the limiting supporting plate penetrates through the lifting inner tube, and positioning columns matched with the positioning ratchets in a clamping mode are elastically arranged on two sides of the limiting supporting plate in the lifting inner tube.

By adopting the technical scheme, when the height of the desk is increased, the base is stepped by two feet, the desktop is lifted by two hands, the positioning columns which are elastically arranged expand in the direction away from the limiting supporting plate under the action of the inclined planes of the positioning ratchets, so that the desktop can move upwards, the desktop is put down after the desk is increased to a proper position, the positioning columns which are elastically arranged are reset and clamped on the positioning ratchets below, and therefore the height of the desk is adjusted, the adjusting mode is simple and convenient, and the height of the desk can be easily adjusted by one person; the lifting outer tube and the lifting inner tube are sleeved together in a sliding mode, the desktop can lift relative to the base, the limiting support plate is matched with the positioning column which is arranged elastically, and the desktop can be positioned at a plurality of different height positions when the desktop moves in the length direction of the limiting support plate.

The present invention may be further configured in a preferred embodiment as: the lifting inner tube is provided with the one end of reference column is seted up and is supplied the movable groove of reference column activity, be provided with the elastic component that is used for providing elastic contraction power between the reference column of spacing backup pad both sides.

Through adopting above-mentioned technical scheme, set up the movable groove, make the reference column can carry out the position dislocation along location ratchet's inclined plane, set up the elastic component between the reference column of spacing backup pad both sides and provide the contractile force for the spacing backup pad of both sides, the reference column can automatic re-setting after losing the restriction on location ratchet inclined plane to with the position of location ratchet butt.

The present invention may be further configured in a preferred embodiment as: one end of the lifting inner pipe, which is provided with the movable groove, is provided with two limiting grooves communicated with the movable groove, and the positioning column is not contacted with the positioning ratchet on the limiting support plate when being positioned in the limiting grooves;

the upper end and the lower end of the limiting supporting plate are provided with expansion sections which enable the positioning columns to be away from each other and blocking sections which are used for enabling the positioning columns to be abutted into or abutted out of the limiting grooves.

By adopting the technical scheme, the height of the desk can be increased in a grading manner, and the desk can be conveniently reset to the lowest position and subjected to new height adjustment; the desktop is lifted to the highest position, at the moment, under the action of the expansion section on the limiting supporting plate, the distance between the positioning columns on the two sides of the limiting supporting plate is kept, the positioning columns abut against the blocking section while moving to the notch positions of the limiting grooves, the positioning columns are abutted into the limiting grooves, then the positioning columns are still limited in the limiting grooves in the process of descending the desktop, the positioning columns cannot abut against the positioning ratchets, and the desktop can directly fall to the lowest position; when the desktop falls to the lowest position, the expansion section at the bottom of the limiting support plate enables the positioning columns to be away from each other again and be pressed into the movable groove by the blocking section at the bottom of the limiting support plate, so that the limiting of the limiting groove is lost, the positioning columns can tightly cling to the expansion section to rise due to the mutual contraction force in the process of lifting the desktop, so that the positioning columns are prevented from falling into the limiting groove again, and at the moment, the desktop can be lifted from the initial position; the height of the desktop can be freely adjusted, the adjusting mode is not changed, and the desktop is operated by a single person, simple and convenient.

The present invention may be further configured in a preferred embodiment as: the width dimension of spacing groove is greater than the width dimension of reference column, the spacing groove with be provided with between the activity groove and fix the anticreep chimb in the spacing backup pad.

By adopting the technical scheme, when the positioning columns are in the limiting grooves, the elastic parts between the positioning columns enable the positioning columns to be tightly attached to the groove walls of the limiting grooves, and in this case, the limiting convex edges between the limiting grooves and the movable grooves can reliably block the positioning columns so as to prevent the positioning columns from being separated from the limiting grooves in the moving process, so that the descending process of the tabletop is more stable and reliable; the width of the limiting groove is larger than that of the positioning column, and under the condition that the positioning lug is arranged, enough withdrawing space is reserved for the positioning column.

The present invention may be further configured in a preferred embodiment as: the lifting inner tube is close to one end of the lifting outer tube and is fixed with a positioning piece, the positioning piece is provided with a dodging groove matched with the limiting support plate in a sliding mode, and the movable groove and the limiting groove are formed in the positioning piece.

By adopting the technical scheme, the positioning piece matched with the limiting supporting plate is arranged at the end part of the lifting inner tube, the avoidance groove, the limiting groove and the anti-falling convex edge are arranged on the positioning piece, the positioning piece and the lifting inner tube are separately processed, the structure on the lifting inner tube is reduced, the processing difficulty and the material strength requirement of the lifting inner tube are reduced, and the structural strength of a slotting region can be ensured by adopting less high-strength materials through independently arranging the positioning piece; the groove of stepping down with spacing backup pad matched with that slides on the setting element can place setting element and spacing backup pad mutual interference on the one hand, and on the other hand has the guiding hole effect, makes the relative slip between setting element and the spacing backup pad more stable, makes the process of increaseing of desk more stable.

The present invention may be further configured in a preferred embodiment as: the two sides of the limiting support plate are respectively fixed with a connecting rod which is matched with the avoiding groove in a sliding mode, two ends of the connecting rod are respectively fixed on expansion sections at the upper end and the lower end of the limiting support plate, and the connecting rod and the expansion sections form an arc-shaped blocking section.

By adopting the technical scheme, the connecting rod is connected between the expansion sections at the upper end and the lower end of the limiting support plate, has a supporting effect and plays a reinforcing role in the limiting support plate; meanwhile, the connecting rod increases the effective sliding volume between the limiting supporting plate and the positioning piece, and further improves the stability when the limiting supporting plate and the positioning piece slide relatively.

The present invention may be further configured in a preferred embodiment as: and an impact buffer piece is fixed at one end of the lifting outer tube close to the lifting inner tube.

By adopting the technical scheme, the impact buffer piece can play a role in buffering when the lifting outer tube is contacted with the lifting part of the desk, so that impact damage is reduced; because the desktop is in a low-resistance state in the descending process, when the lifting force is small, the descending speed of the desktop area is easy to be overhigh, and the impact damage to the desk structure when the speed is overhigh can be effectively reduced by arranging the buffer cushion.

The present invention may be further configured in a preferred embodiment as: an inner arc-shaped rubber plastic protective edge is fixed on one side of the tabletop close to the chest of the human body.

By adopting the technical scheme, the anti-collision device has an anti-collision function, improves the comfort level of the wrist parts of students, and improves the learning environment of the students.

The present invention may be further configured in a preferred embodiment as: the upper end surface of the desktop is provided with a pen groove and a cup groove, the pen groove is communicated with the cup groove, the upper end surface of the desktop is provided with a label slot, and an upper cover plate of the label slot is a transparent acrylic plate fixed on the desktop.

By adopting the technical scheme, the desktop function is optimized, the pen is placed in the pen groove, the pen can be effectively prevented from rolling off, and the cup groove is arranged for placing the cup, so that the stability of the cup on the desktop is improved; pen groove and cup groove intercommunication design, in injection moulding's desktop processing, the design of groove structure intercommunication can effectively reduce the drawing of patterns degree of difficulty, sets up the label slot and places and have student information card be convenient for the student and distinguish the desk.

The present invention may be further configured in a preferred embodiment as: the table top is characterized in that a flat iron reinforcing rib is transversely arranged below the table top and is positioned on one side, close to a human body, of the table top.

By adopting the technical scheme, the frequent stress area of the desktop is locally strengthened, the bearing capacity of the desktop is enhanced, and the service life of the desk is prolonged.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the lifting outer tube and the lifting inner tube which are matched in a sliding and inserting mode are arranged, the desktop can be quickly heightened and positioned between the lifting outer tube and the lifting inner tube in a mode of stepping on a base of the desk and lifting the desktop through the clamping of the positioning columns which are arranged elastically and the positioning ratchet structures on the limiting supporting plates, the heightening mode is convenient and quick and can be completed by one person, the process of heightening the desktop is simplified, the waste of personnel is reduced, the heightening efficiency of the desktop can be improved, when a student uses the desk, the height of the desk can be adjusted automatically according to the height of the student, and the desk is higher in practicability;

2. the limiting grooves for limiting the distance between the positioning columns on the two sides of the limiting supporting plate are arranged, and the expansion sections and the blocking sections at the upper end and the lower end of the limiting supporting plate are used, so that the positioning columns enter the limiting grooves to be positioned and lose efficacy when the desktop is lifted to the highest position, and the positioning columns are separated from the limiting grooves to recover the function when the desktop is lowered to the lowest position, further the effect of controlling the height of the desktop to be lifted through lifting is realized, and the practicability of the desk during use is optimized;

3. the flat iron reinforcing ribs are arranged below the desk top, so that the edge position of the desk top where students lean frequently is locally reinforced, the quality of the desk top is improved, and the service life of the desk is prolonged.

Drawings

FIG. 1 is a schematic structural view of the present embodiment;

FIG. 2 is a partial cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is an enlarged view of area B of FIG. 2;

FIG. 4 is a schematic structural view of the installation relationship between the positioning member and the position-limiting support plate in FIG. 2;

fig. 5 is a schematic structural diagram of a positioning element provided in this embodiment;

fig. 6 is an exploded view of the desktop and bucket structure of the present embodiment.

Reference numerals: 1. a desktop; 11. a pen slot; 12. a cup slot; 13. a label slot; 14. a transparent acrylic sheet; 15. a sliding groove; 16. protecting edges with rubber and plastic; 17. a flat iron reinforcing rib; 18. square steel reinforcing ribs; 181. a fixing hole; 19. an internally threaded post; 2. a class bucket; 3. a table frame; 31. lifting the inner pipe; 32. lifting the outer pipe; 33. a crosspiece; 34. impacting a buffer member; 4. a base; 41. a fixing plate; 42. a foot supporting plate; 43. adjusting the foot pad; 5. a limiting support plate; 51. a connecting plate; 52. positioning the ratchet; 53. an expansion section; 54. a blocking section; 55. a connecting rod; 6. a positioning member; 60. an avoidance groove; 61. a movable groove; 62. a limiting groove; 63. an anti-drop convex edge; 64. a spring slot; 7. a positioning column; 71. an elastic member; 72. prevent the head from falling off.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the steel-plastic desk convenient to lift comprises a desktop 1, a hopper 2 fixed on the lower end surface of the desktop 1, a desk frame 3 fixed below the hopper 2 and supporting the desktop 1 and the hopper 2, and a base 4 fixed below the desk frame 3; the desk frame 3 comprises a lifting inner tube 31 and a lifting outer tube 32 which are made of oval steel tubes, the lifting inner tube 31 and the lifting outer tube 32 are sleeved together to form a supporting piece for supporting the school class bucket 2, one end of the lifting inner tube 31, far away from the lifting outer tube 32, is fixed on the school class bucket 2, the supporting pieces are arranged on two sides of the school class bucket 2, U-shaped crosspieces 33 are welded and fixed between the lifting outer tubes 32 on two sides of the school class bucket 2, the supporting pieces on the two sides of the school class bucket 2 are transversely supported, the structural strength of the desk frame 3 is enhanced, the U-shaped structure can well avoid legs of students, and the activities of the; an end of the outer elevating tube 32 near the inner elevating tube 31 is fixed with a shock absorber 34 by a screw.

Referring to fig. 2 and 3, the base 4 is a stamped steel plate, the lower end of the base 4 is fixedly welded with a fixing plate 41, and the upper end surface of the base 4 is provided with a mounting hole in insertion fit with the lifting outer tube 32; be provided with the spacing backup pad 5 of fixing on fixed plate 41 in the lift outer tube 32, the bottom welded fastening of spacing backup pad 5 has the connecting plate 51 that the level set up, it is fixed to lead to bolted connection spare between fixed plate 41 and the connecting plate 51, spacing backup pad 5 both sides all are provided with a plurality of location ratchets 52 along spacing backup pad 5 length direction an organic whole, extend circular-arc inflation section 53 to both sides respectively at the upper and lower both ends of spacing backup pad 5, be provided with the connecting rod 55 with spacing backup pad 5 an organic whole setting between the inflation section 53 at upper and lower both ends, constitute circular-arc butt section between connecting rod 55 and the inflation section.

Referring to fig. 4 again, a positioning member 6 is fixed at one end of the inner lifting tube 31 close to the limiting support plate 5, an avoiding groove 60 in sliding fit with the limiting support plate 5 is formed in the positioning member 6, positioning ratchets 52 on the side walls of the positioning member 6 corresponding to the two sides of the limiting support plate 5 are respectively provided with a through hole, positioning posts 7 clamped on the positioning ratchets 52 are inserted in the through holes, the through holes are waist-shaped holes allowing the positioning posts 7 to move transversely, an elastic member 71 is arranged between the two positioning posts 7, and the elastic member 71 is a tension spring with two ends respectively sleeved on the two positioning posts 7; one end of the movable hole, which is far away from the other movable hole, is provided with a limiting hole in a penetrating way below the movable hole, the diameter of the limiting hole is larger than that of the positioning column 7, and an anti-falling convex edge 63 capable of being clamped with the positioning column 7 is formed at the junction of the limiting hole and the movable hole; two ends of the positioning column 7 are integrally provided with a round anti-drop head 72 with the diameter larger than the limiting hole and the movable hole; one end of the positioning element 6 close to the lifting inner tube 31 is inserted into the lifting inner tube 31 and is connected with the lifting outer tube 32 in a reinforcing manner through a screw connector, one end of the positioning element 6 close to the lifting outer tube 32 is an oval cylindrical body matched with the lifting outer tube 32 in a sliding manner, and a spring groove 64 for accommodating an elastic element 71 and an anti-falling head 72 of the positioning column 7 is formed in the side wall of the positioning element 6.

Wherein, referring to the working state shown in fig. 3, when the positioning column 7 is positioned in the limiting groove 62, the positioning column does not contact with the positioning ratchet 52 on the limiting support plate 5.

Referring to fig. 5, the positioning member 6 is formed by splicing two components with the same structure, and the avoiding groove 60 is divided into two parts and respectively arranged on the two positioning member 6 components, so that the processing of the avoiding groove 60 on the positioning member 6 is facilitated, the processing thickness of the positioning member 6 during processing is reduced, and the processing difficulty of the positioning member 6 is reduced.

Referring to fig. 1, a tabletop 1 is an injection molded cuboid tabletop 1, and the tabletop 1 is subjected to high-temperature heating, secondary injection molding and secondary molding to ensure that the surface of the tabletop 1 is full of soft feeling; the school bag 2 is fixed on the lower end face of the desktop 1 through screws, a label slot 13 for placing student information labels is formed in the upper left corner of the upper end face of the desktop 1, a transparent acrylic plate 14 which is fixedly adhered on the desktop 1 is arranged above the label slot 13, and a sliding groove 15 which allows a person to move the labels in the label slot 13 to obtain is formed in the transparent acrylic plate 14 in a penetrating manner; a cylindrical cup groove 12 and a strip-shaped pen groove 11 are formed in the upper right corner of the desktop 1, the pen groove 11 is communicated with the cup groove 12, and demolding after injection molding of the desktop 1 can be facilitated; the rubber plastic protective edge 16 is attached to one side edge, close to a human body, of the tabletop 1, the side edge of the rubber plastic protective edge 16 is arc-shaped, and the rubber plastic protective edge 16 has an anti-collision function and can also increase the comfort level of the wrist portion of the human body.

Referring to fig. 6 again, the hopper 2 is fixed below the tabletop 1 through screws, the lower end of the tabletop 1 forms a plurality of reinforcing rib structures which are integrally arranged when injection molding, and a flat iron reinforcing rib 17 which is transversely arranged is embedded in the tabletop 1; the recess of the cuboid form of horizontal setting is preset to desktop 1 below, and the recess internal fixation has square steel strengthening rib 18, has preset in the recess with the integrative internal thread post 19 that sets up of desktop 1, corresponds internal thread post 19 and link up on the square steel strengthening rib 18 and offers and peg graft the cylindric fixed orifices 181 of cooperation with internal thread post 19, through connect screw fastener soon the fixed of square steel strengthening rib 18 of realization in internal thread post 19. The strength and rigidity of the desktop 1 are enhanced by arranging the square steel reinforcing ribs 18 and the flat iron reinforcing ribs 17, so that the desk is more durable; square steel strengthening rib 18 and band iron strengthening rib 17 span in the both sides of fighting 2 in class, the class is fought 2 and is supported the both ends of band iron strengthening rib 17 and square steel strengthening rib 18, optimize the supporting effect of strengthening rib, square steel strengthening rib 18 and band iron strengthening rib 17 are located desktop 1 and are close to the table and fight 2 open-ended positions (being close to the human body), the student is when using the desk, often can rely on or lie prone and fight 1 marginal area of desktop above 2 open-ended in class, square steel strengthening rib 18 and band iron strengthening rib 17 strengthen this region, desktop 1's structural strength has been strengthened greatly.

Referring to fig. 2, the two ends of the base 4 are welded and fixed with the leg plates 42, the lower ends of the leg plates 42 are screwed with the adjusting foot pads 43, and the supporting height of the adjusting foot pads 43 is changed by screwing, so that the desk is leveled.

The implementation principle of the embodiment is as follows: when the height of the desk is increased, feet step on the base 4, the desktop 1 is lifted by two hands, the positioning columns 7 are deflected in the direction away from the limiting supporting plate 5 under the action of the inclined planes at the lower ends of the positioning ratchets 52 (the elastic pieces 71 are stretched), so that the desktop 1 can move upwards, after the positioning columns are increased to a proper position, the desktop 1 is put down, the elastic pieces 71 pull the positioning columns 7 back to clamping positions and are clamped on the positioning ratchets 52 below, and therefore the height of the desk is adjusted, and the positioning ratchets 52 in the vertical direction represent the height positions of a plurality of desks; the desktop 1 is lifted to the highest position, at the moment, due to the action of the expansion section 53 on the limiting support plate 5, the distance between the positioning columns 7 on the two sides of the limiting support plate 5 is expanded to the extent that the positioning columns can enter the limiting groove 62, the positioning columns 7 are abutted against the blocking sections 54 while the positioning columns 7 move to the notch positions of the limiting groove 62, and the positioning columns 7 are abutted into the limiting groove 62 by the blocking sections 54; then, in the process that the desktop 1 is going down, the positioning column 7 is still limited in the limiting groove 62, and after the positioning column 7 is separated from the expansion end, the positioning column 7 is tightly attached to the side wall of the limiting groove 62 under the action of the elastic piece 71, the limiting anti-falling convex edge 63 can effectively prevent the positioning column 7 from falling out of the limiting groove 62, the positioning column 7 cannot be abutted against the positioning ratchet 52, and the desktop 1 can directly fall to the lowest position; when the desktop 1 falls to the lowest position, the expansion section 53 at the bottom of the limiting support plate 5 enables the positioning columns 7 to be away from each other again and be abutted into the movable groove 61 by the blocking section 54 at the bottom of the limiting support plate 5, the positioning columns 7 restore to move in the movable groove 61, and the positioning columns 7 cling to the expansion section 53 to rise due to the action of the elastic pieces 71 in the rising process of the desktop 1, so that the positioning columns 7 are prevented from falling into the limiting groove 62 again, and at the moment, the desktop 1 can be heightened from the initial position; the height of the desktop 1 can be freely adjusted, the adjusting mode is not changed, and the desktop is operated by a single person, so that the desktop is simple and convenient; because the lower process of the part of the desktop 1 is free from a blocking mechanism, the descending speed of the desktop 1 is easy to be too high, and the impact buffer piece 34 can effectively reduce the damage of the impact to the whole desk.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (10)

1. A steel-plastic desk convenient to lift comprises a desktop (1) and a base (4), and is characterized in that a lifting outer tube (32) and a lifting inner tube (31) which are slidably inserted and sleeved together are arranged between the base (4) and the desktop (1);

be fixed with spacing backup pad (5) on base (4), spacing backup pad (5) both sides all are provided with a plurality of location ratchet (52) along length direction, spacing backup pad (5) are kept away from the one end of base (4) is worn to locate in lift inner tube (31), in lift inner tube (31) in the equal elasticity in both sides of spacing backup pad (5) be provided with location ratchet (52) joint complex reference column (7).

2. The steel-plastic desk convenient to lift as claimed in claim 1, wherein one end of the lifting inner tube (31) provided with the positioning column (7) is provided with a movable groove (61) for the movement of the positioning column (7), and an elastic member (71) for providing elastic contraction force is arranged between the positioning columns (7) on both sides of the limiting support plate (5).

3. The steel-plastic desk convenient to lift as claimed in claim 2, wherein one end of the lifting inner tube (31) provided with the movable groove (61) is provided with two limiting grooves (62) communicated with the movable groove (61), and the positioning column (7) is not in contact with the positioning ratchet (52) on the limiting support plate (5) when being positioned in the limiting grooves (62);

the upper end and the lower end of the limiting support plate (5) are respectively provided with an expansion section (53) which enables the positioning column (7) to be away from each other and a blocking section (54) which is used for enabling the positioning column (7) to be abutted into or abutted out of the limiting groove (62).

4. The steel-plastic desk convenient to lift as claimed in claim 3, wherein the width dimension of the limiting groove (62) is larger than the width dimension of the positioning column (7), and an anti-falling convex edge (63) fixed on the limiting support plate (5) is arranged between the limiting groove (62) and the movable groove (61).

5. The steel-plastic desk convenient to lift according to claim 4, wherein a positioning piece (6) is fixed at one end of the lifting inner tube (31) close to the lifting outer tube (32), an avoiding groove (60) matched with the limiting support plate (5) in a sliding manner is formed in the positioning piece (6) in a penetrating manner, and the movable groove (61) and the limiting groove (62) are formed in the positioning piece (6).

6. The steel-plastic desk convenient to lift as claimed in claim 5, wherein connecting rods (55) in sliding fit with the avoiding grooves (60) are fixed on both sides of the limiting support plate (5), both ends of each connecting rod (55) are respectively fixed on expansion sections (53) at the upper end and the lower end of the limiting support plate (5), and the arc-shaped blocking sections (54) are formed between the connecting rods (55) and the expansion sections (53).

7. A conveniently liftable steel-plastic desk according to claim 3 and characterized in that an impact damper (34) is fixed to one end of said outer lifting pipe (32) close to said inner lifting pipe (31).

8. The steel-plastic desk convenient to lift as claimed in claim 1, wherein a rubber-plastic protective edge (16) with an inner arc shape is fixed on one side of the desktop (1) close to the chest of a human body.

9. The steel-plastic desk convenient to lift as claimed in claim 1, wherein a pen groove (11) and a cup groove (12) are formed in the upper end face of the desktop (1), the pen groove (11) is communicated with the cup groove (12), a label slot (13) is formed in the upper end face of the desktop (1), and an upper cover plate of the label slot (13) is a transparent acrylic plate (14) fixed on the desktop (1).

10. The steel-plastic desk convenient to lift as claimed in claim 1 is characterized in that a flat iron reinforcing rib (17) is transversely arranged below the desk top (1).

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