CN109569765B

CN109569765B - Chemical experiment frame

Info

Publication number: CN109569765B
Application number: CN201910011962.XA
Authority: CN
Inventors: 刘学营
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-01-07
Filing date: 2019-01-07
Publication date: 2021-02-02
Anticipated expiration: 2039-01-07
Also published as: CN109569765A

Abstract

The invention discloses a chemical experiment rack, which belongs to the field of chemical experiment equipment and comprises an upper cover body and a lower cover body which are mutually hinged, wherein the upper cover body and the lower cover body are respectively provided with an expansion upper plate and an expansion lower plate in a sliding manner, the expansion upper plate is provided with a positioning device and an elastic containing basket, the expansion lower plate is provided with a drying rack, the upper cover body is also provided with a storage rack and a storage bottom plate, the lower cover body is also provided with a fixing frame and a glass rod accommodating groove, and the bottom of the lower cover body is provided with a sucker; the portable test tube rack can be used for placing test tubes with different lengths and specifications, positioning beakers or alcohol lamps with different types and specifications, is convenient to carry, and is particularly suitable for outdoor use.

Description

Chemical experiment frame

Technical Field

The invention relates to the field of chemical experiment equipment, in particular to a chemical experiment rack.

Background

In the process of learning chemistry, chemical experiments are often not left, particularly in middle school or high school, the practical ability of students is limited, potential safety hazards are easily brought in the process of chemical experiments, and great harm is brought to students or schools; in the process of doing the experiment, the student turns over the test tube easily, or the landing, just so causes the leakage of liquid in the test tube easily, and these liquid are many in the chemical experiment all have corrosivity or easily fire, in case turn over just can cause very big injury, but also can use test appliances such as alcohol burner, all are dangerous, have a great deal of potential safety hazard.

Through the retrieval, the chinese patent "a chemical experiment frame for teaching" that application publication number is CN 205700615U, it includes the base, the equal fixedly connected with stand in both sides at base top, the top of base is provided with the picture peg, the slot has been seted up at the top of picture peg, the recess that uses with the slot cooperation is seted up at the top of base, the equal fixedly connected with nest block in both sides of picture peg. Through the stand, the card hole, the fixed box, the screw rod, the spout, the slider, the swivel nut, the connecting rod, the sliding sleeve, the slide bar, the die-pin, lead to the groove, a spring, turn round the piece, the cooperation of kelly and sleeve piece is used, it is fixed to have solved current test-tube rack structure for chemistry experiments, can not carry out the problem of altitude mixture control according to the test tube of different length, this test-tube rack for chemistry experiments possesses height-adjustable's advantage, the user can adjust the height of test-tube rack according to the height of test tube, but the person of facilitating the use is to placing of different length test tubes, the practicality of test-tube rack for chemistry experiments has been.

It is also found through retrieval that the portable multilayer experiment rack for the chemical engineering major with the authorization notice number of CN 205379911U comprises a chemical experiment rack for teaching, a test tube box is fixed on one side of the upper surface of a base, a test tube groove is formed in the upper surface of the test tube box, a control panel is arranged on one side of the test tube box, a lamp tube control button and an electric heating block control button are arranged on the control panel, a lamp tube is arranged at the upper end of the test tube box, a flask placing frame is arranged on one side of the upper surface of the base, an article placing frame is arranged on the other side of the upper surface of the base, a storage battery is arranged on one side of the article placing frame, a heating device is arranged on the upper surface of the base, the electric heating block is arranged in a shell, ventilation openings are uniformly arranged on two sides of the shell, the storage battery is electrically connected to the control panel, and, and the lamp tube is electrically connected with the lamp tube control button. The upper surface of the base is provided with the heating device, so that the use of the alcohol lamp is prevented, the danger is reduced, the operation is facilitated, the success rate is increased, and the generated waste is recycled.

However, the above solutions have the following problems: not do and carry, because to some profession students, need gather sample or sample in the open air, the outdoor environment is abominable, and it is more difficult to possess the experimental environment like the laboratory, so need design a section conveniently carries and have the chemical experiment frame of more functions.

Disclosure of Invention

In order to solve the existing problems, the invention discloses a chemical experiment rack which comprises an upper cover body and a lower cover body, wherein one end of the upper cover body is hinged with the lower cover body, and the other end of the upper cover body is fixed with the lower cover body through a lock catch; the upper cover body comprises a first upper cover and a second upper cover, a containing cavity penetrating through one side wall of the first upper cover is arranged in the first upper cover, an expansion upper plate is arranged in the containing cavity in a sliding mode, and the expansion upper plate is fixed with one side wall of the second upper cover; the expansion upper plate is provided with a plurality of expansion grooves, each expansion groove is internally provided with a positioning device, each positioning device consists of a plurality of positioning parts which are sequentially arranged from top to bottom, each positioning part comprises a compression spring and a positioning block, one end of each compression spring is fixed with the bottom of each expansion groove, the other end of each compression spring is fixed with the corresponding positioning block, one end of each positioning block, far away from the compression spring, is provided with a slide rail, the slide rails on the positioning blocks are mutually communicated in the vertical direction, slide blocks are arranged on the slide rails in a sliding manner, elastic storage baskets are fixed on the slide blocks, and at least 1 slide block is arranged on each slide;

two side walls of the expansion groove are provided with sliding grooves, horizontal supporting rods are arranged on the sliding grooves in a sliding mode, and the horizontal supporting rods are fixed with the sliding blocks; when the horizontal supporting rod slides downwards in the sliding groove and leaves the corresponding positioning block, the compression spring returns to a natural state and pushes out the positioning block, and the positioning block is positioned at the top end of the elastic containing basket;

an expansion bottom plate is fixed at the bottom of the expansion groove;

the lower cover body comprises a first lower cover and a second lower cover movably connected with the first lower cover, the first lower cover corresponds to the first upper cover in position, and the second upper cover corresponds to the second lower cover in position;

the inner surface of the first upper cover is provided with a storage rack and a storage bottom plate, the storage bottom plate is arranged at the lower end of the storage rack, the storage rack comprises a plurality of storage blocks arranged in a rectangular array, positioning holes are formed in the storage blocks, the storage blocks and the storage bottom plate are hinged to the inner surface of the upper cover body, and positioning grooves are formed in the storage bottom plate and correspond to the positioning holes;

a first groove and a second groove are formed in the inner surface of the second upper cover, a supporting rod is horizontally arranged in the first groove, and a plurality of supporting rods are vertically arranged in the second groove;

the upper surface of the second lower cover is provided with a mounting groove, and a detachable fixing frame is arranged in the mounting groove.

Preferably, an expansion lower plate is arranged between the first lower cover and the second lower cover in a sliding mode, the expansion lower plate is arranged in a hollow mode, a drying rack is arranged on the expansion lower plate, and the hollow mode is convenient to drain.

Preferably, dry the frame including fixing the connecting block on the extension hypoplastron, articulated on the connecting block have telescopic branch of drying, can dry the cup utensil of sanitization when using, convenient storage.

Preferably, the fixing frame comprises an upper support, a connecting rod and a lower support, the top of the connecting rod is hinged to the upper support, the lower end of the connecting rod is hinged to a roller, the roller is clamped with a roller clamping groove, the roller clamping groove is formed in the upper surface of the lower support, the height of the alcohol lamp is adjusted through the device, the adjustment is convenient and labor-saving, and the heating point of the alcohol lamp is adjusted.

Preferably, the upper surface of the upper bracket is provided with a positioning groove for further fixing and positioning the alcohol lamp.

Preferably, positioning groove's center department is equipped with the holding ring, the holding ring includes first ring portion, second ring portion, third ring portion and the fourth ring portion of partition split equally, and first ring portion, second ring portion, third ring portion and fourth ring portion's the outside all distributes and have first spring, and first spring is fixed with positioning groove's inner wall, can also fix a position the protection to the beaker of equidimension not, avoids the striking to empty.

Preferably, the bottom of first ring portion, second ring portion, third ring portion and fourth ring portion still is connected with the second spring, the second spring is fixed with positioning groove's bottom, the upper end of second spring with positioning groove's bottom hasp is fixed, when not using, can be with its locking location, does not account for the space.

Preferably, the rubber pads are installed on the inner side walls of the first ring part, the second ring part, the third ring part and the fourth ring part, and the rubber pads play a role in buffering protection.

Preferably, a glass rod placing groove is formed in the first lower cover.

Preferably, the bottom of the lower cover body is provided with a sucker, so that the sucker is not easy to move in use.

The invention has the beneficial effects that:

(1) through set up positioner and elasticity on the extension upper plate and accomodate the basket, can accomodate the test tube, because the test tube adopts the glass material mostly, easy breakage, so storage device seems especially important, but the test tube has the model of different length size, and the elasticity is accomodate the basket and can be adjusted according to the different length of test tube, combines positioner's setting simultaneously, accomodates the basket with elasticity and fixes a position convenient and practical.

(2) Cover rectangle array setting on first upper cover and put the thing piece, when needing to use, will put the thing piece and open, also can select to open the thing piece of putting that is fit for the position according to the length of test tube, put into the test tube from the locating hole, place the constant head tank department on putting the thing bottom plate at the bottom of the test tube, lay.

(3) Through setting up the mount, can adjust the position of alcohol burner or beaker when experimenting, set up the holding ring simultaneously on the mount, can carry out location protection device to the alcohol burner, but also can adapt to the alcohol burner or the beaker of equidimension not.

(4) The extension upper plate and the extension lower plate are arranged, so that the expansion upper plate and the extension lower plate can be selectively used when needed, do not occupy space and are convenient to carry.

When the outdoor experiment device is not used, the upper cover body and the lower cover body are closed, so that the outdoor experiment device is convenient to store and carry, small in occupied area and particularly suitable for users of outdoor experiments.

Drawings

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

FIG. 2 is a second schematic structural view of the present invention;

FIG. 3 is a third schematic structural view of the present invention;

FIG. 4 is a fourth schematic structural view of the present invention;

FIG. 5 is a front view of the extended upper plate;

FIG. 6 is a side view of the extended upper plate;

FIG. 7 is an enlarged view of a portion of FIG. 6;

FIG. 8 is a schematic view of the structure of the drying rack;

FIG. 9 is a front view of the mount;

FIG. 10 is a top view of the retaining groove;

FIG. 11 is a front view of the fixing groove;

in the figure, 1-upper cover, 2-lower cover, 3 sucker, 11-first upper cover, 111-object placing block, 112-object placing bottom plate, 113-locating hole, 12-second upper cover, 121-supporting rod, 122-supporting rod, 123-expanding upper plate, 1231-locating block, 1232-compression spring, 1233-elastic receiving basket, 1234-expanding groove, 1235-expanding floor, 1236-sliding block, 1237-horizontal supporting rod, 1238-sliding rail, 21-first lower cover, 211-glass rod placing groove, 22-second lower cover, 221-installing groove, 222-upper support, 223-lower support, 2231-roller clamping groove, 224-connecting rod, 225-locating groove, 2251-first spring, 2252-locating ring, 2253-rubber pad, 2254-second spring.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following detailed description of specific embodiments of the invention refers to the accompanying drawings.

Example 1

As shown in fig. 1-7, a chemical experiment rack comprises an upper cover body 1 and a lower cover body 2, wherein one end of the upper cover body 1 is hinged with the lower cover body 2, and the other end is fixed with the lower cover body 2 by locking; the upper cover body 1 comprises a first upper cover 11 and a second upper cover 12, a containing cavity penetrating through one side wall of the first upper cover 11 is arranged in the first upper cover, an expansion upper plate 123 is arranged in the containing cavity in a sliding mode, and the expansion upper plate 123 is fixed with one side wall of the second upper cover 12; the expansion upper plate 123 is provided with 4 expansion grooves 1234, the number is not limited during specific implementation, each expansion groove 1234 is internally provided with a positioning device, the positioning device is composed of 6 positioning parts which are sequentially arranged from top to bottom, each positioning part comprises a compression spring 1232 and a positioning block 1231, one end of each compression spring 1232 is fixed with the bottom of the expansion groove 1234, the other end of each compression spring 1232 is fixed with the positioning block 1231, one end of each positioning block 1231, which is far away from the compression spring 1232, is provided with a sliding rail 1238, the sliding rails 1238 on each positioning block 1231 are mutually communicated in the vertical direction, the sliding rail 1238 is provided with a sliding block 1236 in a sliding manner, the sliding block 1236 is fixed with an elastic storage basket 1233, and at least 1 sliding block 1236 is arranged on the sliding rail 1238 on;

two side walls of the expansion groove 1234 are provided with sliding grooves, horizontal supporting rods 1237 are slidably arranged on the sliding grooves, and the horizontal supporting rods 1237 are fixed with the sliding blocks 1236; initially, the compression spring 1232 is in a compressed state, and when the horizontal strut 1237 slides downward in the sliding groove and leaves the corresponding positioning block 1231, the compression spring 1232 returns to a natural state, and pushes out the positioning block 1231, and the positioning block 1231 exceeds the surface of the extended upper plate 123, and the exceeding portion can fix the elastic storage basket 1233, but cannot affect the placement of the test tube;

an expansion bottom plate 1235 is fixed to the bottom of the expansion groove 1234; when concrete implementation, elasticity is accomodate basket 1233 and can be directly used the spring of different model specifications, the cavity form position that uses the spring is for accomodating the chamber, the processing test tube is placed from the hollow portion of spring promptly, the lower extreme and the extension floor 1235 of spring are fixed, slider 1236 is fixed with this spring, in the use, when glass test tube length is less, can compress this spring to suitable position, it slides at slide rail 1238 to drive horizontal branch 1237, locating piece 1231 that horizontal branch 1237 left, will be jack-up, thereby can block the spring, realize the location, if the length of recovering the spring, press the locating piece can.

The lower cover body 2 comprises a first lower cover 21 and a second lower cover 22 movably connected with the first lower cover 21, the first lower cover 21 corresponds to the first upper cover 11 in position, and the second upper cover 12 corresponds to the second lower cover 22 in position;

the inner surface of the first upper cover 11 is provided with a commodity shelf and a commodity placing bottom plate 112, the commodity placing bottom plate 112 is arranged at the lower end of the commodity shelf, the commodity shelf comprises a plurality of commodity placing blocks 111 arranged in a rectangular array, positioning holes 113 are formed in the commodity placing blocks 111, the commodity placing blocks 111 and the commodity placing bottom plate 112 are both hinged with the inner surface of the first upper cover 11, and positioning grooves are formed in the commodity placing bottom plate 112 and correspond to the positioning holes 113; as shown in FIG. 2, when the length of the test tube is small, only the lower object placing block 111 and the object placing bottom plate 112 can be selected to be opened.

A first groove and a second groove are formed in the inner surface of the second upper cover 12, a supporting rod 121 is horizontally arranged in the first groove, a plurality of supporting rods 122 are vertically arranged in the second groove, and the arrangement is convenient for a user to use by combining with chemical experiment accessories such as a test tube clamp and the like;

the upper surface of the second lower cover 22 is provided with a mounting groove 221, and a detachable fixing frame is arranged in the mounting groove 221.

Example 2

The embodiment is further optimized on the basis of embodiment 1, specifically, an extended lower plate 124 is slidably disposed between the first lower cover 21 and the second lower cover 22, the extended lower plate 124 is hollow, and a drying rack 125 is disposed on the extended lower plate 124.

As shown in fig. 8, the airing rack 125 includes a connecting block 1251 fixed on the extension lower plate 124, and a telescopic airing rod 1252 is hinged on the connecting block 1251.

This embodiment is more favorable to regular collection test tube, is difficult for obscuring, is favorable to the development of experiment.

Example 3

The present embodiment is further optimized based on embodiment 2, as shown in fig. 9, specifically, the fixing frame includes an upper bracket 222, a connecting rod 224 and a lower bracket 223, the top of the connecting rod 224 is hinged to the upper bracket 222, the lower end of the connecting rod 224 is hinged to a roller, the roller is clamped to a roller clamping groove 2231, and the roller clamping groove 2231 is disposed on the upper surface of the lower bracket 223.

The upper surface of the upper bracket 222 is provided with a positioning groove 225.

Example 4

The present embodiment is further optimized based on embodiment 3, as shown in fig. 10, specifically, a positioning ring 2252 is disposed at the center of the positioning groove 225, the positioning ring 2252 includes a first ring portion, a second ring portion, a third ring portion, and a fourth ring portion that are equally divided, first springs 2251 are respectively distributed at the outer sides of the first ring portion, the second ring portion, the third ring portion, and the fourth ring portion, and the first springs 2251 are fixed to the inner wall of the positioning groove 225.

Example 5

The present embodiment is further optimized based on embodiment 3, as shown in fig. 11, specifically, the bottom portions of the first ring portion, the second ring portion, the third ring portion, and the fourth ring portion are further connected with a second spring 2254, the second spring 2254 is fixed to the bottom portion of the positioning groove 225, the upper end of the second spring 2254 is fixed to the bottom portion of the positioning groove 225 by a latch, and when not in use, the spring is latched and does not occupy space.

Rubber pads 2253 are installed on the inside walls of the first ring part, the second ring part, the third ring part and the fourth ring part, and play a role in protecting and buffering.

Example 6

The embodiment is further optimized on the basis of embodiment 5, and particularly, the first lower cover 21 is provided with a glass rod placing groove 211, so that the glass rods are convenient to collect and are not lost or dropped to be broken.

The bottom of the lower cover body 2 is provided with a sucker 3 for further fixing the experiment frame.

During the use, sucking disc 3 is fixed on table surface, open upper cover 1, length according to the glass test tube, open the relevant position put thing piece 111 with put thing bottom plate 112, pass the test tube from the locating hole 113 settle can, use branch and bracing piece combination test tube clamp or other accessories, utilize the regulating action of mount, fix a position alcohol burner or beaker, if need the glass stick, can follow glass stick arrangement groove 211 and take out, and simultaneously, if the supporter uses inadequately, can take extension upper plate 123 and extension hypoplastron 124 out, the elasticity of extension upper plate 123 is accomodate basket 1233 and can also be played the effect of placing the glass test tube, according to positioner's regulation, also can fix different length test tubes, the dry frame 125 of extension hypoplastron 124 can invert the test tube of washout and dry.

The above embodiments only describe the best mode of use of the existing equipment, and similar common mechanical means are used to replace the elements in the present embodiments, which fall into the protection scope.

Claims

1. A chemical experiment frame is characterized in that: the novel multifunctional cover comprises an upper cover body (1) and a lower cover body (2), wherein one end of the upper cover body (1) is hinged with the lower cover body (2), and the other end of the upper cover body is fixed with the lower cover body (2) in a locking manner; the upper cover body (1) comprises a first upper cover (11) and a second upper cover (12), a containing cavity penetrating through one side wall of the first upper cover (11) is arranged in the first upper cover, an expansion upper plate (123) is arranged in the containing cavity in a sliding mode, and the expansion upper plate (123) is fixed with one side wall of the second upper cover (12); the expansion upper plate (123) is provided with a plurality of expansion grooves (1234), each expansion groove (1234) is internally provided with a positioning device, each positioning device consists of a plurality of positioning parts which are sequentially arranged from top to bottom, each positioning part comprises a compression spring (1232) and a positioning block (1231), one end of each compression spring (1232) is fixed to the bottom of each expansion groove (1234), the other end of each compression spring is fixed to each positioning block (1231), one end, far away from the compression spring (1232), of each positioning block (1231) is provided with a sliding rail (1238), the sliding rails (1238) on each positioning block (1231) are mutually communicated in the vertical direction, each sliding rail (1238) is provided with a sliding block (1236) in a sliding manner, each sliding block (1236) is fixedly provided with an elastic containing basket (1233), and at least 1 sliding block (1236) is arranged on each sliding rail (1238) on each;

sliding grooves are formed in two side walls of the expansion groove (1234), horizontal supporting rods (1237) are arranged on the sliding grooves in a sliding mode, and the horizontal supporting rods (1237) are fixed with the sliding blocks (1236); initially, the compression spring (1232) is in a compressed state, when the horizontal strut (1237) slides downwards in the sliding groove and leaves the corresponding positioning block (1231), the compression spring (1232) returns to a natural state to eject the positioning block (1231), and the positioning block (1231) is positioned at the top end of the elastic storage basket (1233) to fix the elastic storage basket;

an expansion bottom plate (1235) is fixed at the bottom of the expansion groove (1234);

the lower cover body (2) comprises a first lower cover (21) and a second lower cover (22) movably connected with the first lower cover (21), the first lower cover (21) corresponds to the first upper cover (11) in position, and the second upper cover (12) corresponds to the second lower cover (22) in position;

the inner surface of the first upper cover (11) is provided with a commodity shelf and a commodity placing bottom plate (112), the commodity placing bottom plate (112) is arranged at the lower end of the commodity shelf, the commodity shelf comprises a plurality of commodity placing blocks (111) arranged in a rectangular array, positioning holes (113) are formed in the commodity placing blocks (111), the commodity placing blocks (111) and the commodity placing bottom plate (112) are hinged to the inner surface of the first upper cover (11), and positioning grooves are formed in the commodity placing bottom plate (112) and correspond to the positioning holes (113);

a first groove and a second groove are formed in the inner surface of the second upper cover (12), a supporting rod (121) is horizontally arranged in the first groove, and a plurality of supporting rods (122) are vertically arranged in the second groove;

the upper surface of the second lower cover (22) is provided with a mounting groove (221), and a detachable fixing frame is arranged in the mounting groove (221).

2. A chemical laboratory bench according to claim 1 wherein: an expansion lower plate (124) is arranged between the first lower cover (21) and the second lower cover (22) in a sliding mode, the expansion lower plate (124) is arranged in a hollow-out mode, and a drying rack (125) is arranged on the expansion lower plate (124).

3. A chemical laboratory bench according to claim 2 wherein: the airing rack (125) comprises a connecting block (1251) fixed on the expansion lower plate, and a telescopic airing support rod (1252) is hinged on the connecting block (1251).

4. A chemical laboratory bench according to claim 3 wherein: the fixing frame comprises an upper support (222), a connecting rod (224) and a lower support (223), the top of the connecting rod (224) is hinged to the upper support (222), a roller is hinged to the lower end of the connecting rod (224), the roller is clamped with a roller clamping groove (2231), and the roller clamping groove (2231) is formed in the upper surface of the lower support (223).

5. A chemical laboratory bench according to claim 4 wherein: and a positioning groove (225) is formed in the upper surface of the upper bracket (222).

6. A chemical laboratory bench according to claim 5 wherein: locating ring (2252) are arranged at the center of locating groove (225), locating ring (2252) comprises a first ring part, a second ring part, a third ring part and a fourth ring part which are equally divided, first springs (2251) are distributed on the outer sides of the first ring part, the second ring part, the third ring part and the fourth ring part, and the first springs (2251) are fixed to the inner wall of locating groove (225).

7. A chemical laboratory bench according to claim 6 wherein: the bottom of first ring portion, second ring portion, third ring portion and fourth ring portion still is connected with second spring (2254), second spring (2254) are fixed with the bottom of positioning groove (225), the upper end of second spring (2254) with the bottom hasp of positioning groove (225) is fixed.

8. A chemical laboratory bench according to claim 7 wherein: rubber pads (2253) are mounted on the inner side walls of the first ring part, the second ring part, the third ring part and the fourth ring part.

9. A chemical laboratory bench according to claim 8 wherein: the first lower cover (21) is provided with a glass rod placing groove (211).

10. A chemical laboratory rack according to any of claims 1 to 9, wherein: and a sucker (3) is arranged at the bottom of the lower cover body (2).