CN211721382U - Agricultural is with being suitable for different topography and conveniently getting material's soilless culture frame - Google Patents

Abstract

The utility model relates to an agricultural is with being suitable for different topography and conveniently taking the soilless culture frame of material, including base, rotation axis, supporting mechanism, dead lever, support body, installation mechanism, connecting block, lug, concatenation mechanism, first fluting, disassembly body and fixing device, the base bottom is fixed with the rotation axis, the supporting mechanism is installed below the rotation axis, the surface mounting has the dead lever on the base, the support body is installed to the dead lever top, installation mechanism fixes in the support body bottom, the connecting block is fixed on support body one side upper and lower surface, the lug is installed to the one end that the connecting block kept away from the support body; the utility model discloses in supporting mechanism, twist and move the telescopic link, can make the telescopic link rise and descend well in first inside groove and the second inside groove of the inside helicitic texture of first fixed block and second fixed block, be convenient for adjust the height of bracing piece according to the topography, can fix cultivation frame at appointed topography well, be convenient for make cultivation frame be applicable to different topography.

Description

Agricultural is with being suitable for different topography and conveniently getting material's soilless culture frame

Technical Field

The utility model relates to an agricultural soilless culture field especially relates to an agricultural is with being suitable for different topography and conveniently getting the soilless culture frame of material.

Background

Soilless culture is a new crop culture technology developed in recent decades. The cultivated crops are not cultivated in soil, but are planted in aqueous solution (nutrient solution) dissolved with mineral substances, or are cultivated in some cultivation substrate by using the nutrient solution, and a soilless culture frame is needed during cultivation.

In the use of reality, current soilless culture frame is not convenient for adjust the height of bracing piece according to the topography when using, can not fix cultivation frame at appointed topography well, is not convenient for make cultivation frame be applicable to different topographies, moreover when using, can not be as required the appropriate angle of adjusting cultivation frame, can not be convenient for get the material well simultaneously, when using, can not splice the installation with cultivation frame well.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an agricultural is with being suitable for different topography and conveniently getting soilless culture frame of material, with the current soilless culture frame of proposing in solving above-mentioned background art, be not convenient for adjust the height of bracing piece according to the topography when using, can not fix cultivation frame at appointed topography well, be not convenient for make cultivation frame be applicable to different topography, and when using, can not be as required the appropriate angle of adjusting cultivation frame, can not be convenient for get the material well simultaneously, when using, can not splice the problem of installation with cultivation frame well.

In order to realize the above purpose, the utility model discloses a technical scheme be: the agricultural soilless culture frame suitable for different terrains and convenient for material taking comprises a base (1), a supporting mechanism (3), an installing mechanism (6), a connecting block (7), a splicing mechanism (9), a first groove (10) and a fixing device (12), wherein a rotating shaft (2) is fixed at the bottom of the base (1), the supporting mechanism (3) is installed below the rotating shaft (2), a fixing rod (4) is fixed on the upper surface of the base (1), a frame body (5) is installed above the fixing rod (4), the installing mechanism (6) is fixed at the bottom of the frame body (5), the connecting block (7) is fixed on the upper surface and the lower surface of one side of the frame body (5), a convex block (8) is installed at one end, away from the frame body (5), of the connecting block (7) is sleeved on the outer portion of the connecting blocks (7) at the joints among the frame bodies (5), first fluting (10) are seted up at support body (5) upper surface, disassembly body (11) are installed to first fluting (10) top, fixing device (12) are fixed in first fluting (10) inner wall.

Furthermore, the supporting mechanism (3) comprises a first fixing block (31), a first inner groove (32), a supporting rod (33), a second fixing block (34), a second inner groove (35) and a telescopic rod (36), the first fixing block (31) is fixed at the bottom of the rotating shaft (2), the first inner groove (32) is formed in the first fixing block (31), the supporting rod (33) is installed below the first fixing block (31), the second fixing block (34) is fixed at the upper end of the supporting rod (33), the second inner groove (35) is formed in the second fixing block (34), one end of the telescopic rod (36) is screwed in the first inner groove (32), and the other end of the telescopic rod (36) is screwed in the second inner groove (35).

Furthermore, the surfaces of the first inner groove (32), the second inner groove (35) and the telescopic rod (36) are in threaded structures, the inner sizes of the first inner groove (32) and the second inner groove (35) are matched with the outer size of the telescopic rod (36), and the first inner groove (32) and the second inner groove (35) are in threaded connection through the telescopic rod (36).

Furthermore, installation mechanism (6) includes pivot (61), third fixed block (62) and third inside groove (63), pivot (61) are fixed in support body (5) bottom, pivot (61) bottom is fixed with third fixed block (62), third inside groove (63) have been seted up to third fixed block (62).

Furthermore, the third fixing block (62) and the frame body (5) form a rotating structure through a rotating shaft (61), the rotating angle range of the third fixing block (62) is 0-360 degrees, the inner part of the third inner groove (63) and the outer upper end point of the fixing rod (4) are both in a threaded structure, and the third fixing block (62) is in threaded connection with the fixing rod (4) through the third inner groove (63).

Furthermore, the splicing mechanism (9) comprises splicing blocks (91), fourth inner grooves (92) and grooves (93), the splicing blocks (91) are installed on the connecting blocks (7) among the 2 frame bodies (5), the fourth inner grooves (92) are formed in the splicing blocks (91), the grooves (93) are formed in the inner walls of the fourth inner grooves (92) close to the middle positions, and the convex blocks (8) are placed in the grooves (93).

Furthermore, the grooves (93) are symmetrically arranged about the transverse central axis of the splicing block (91), the diameter of each groove (93) is equal to that of the corresponding bump (8), and the inner size of each fourth inner groove (92) is matched with the size of the outer portion of the connecting block (7).

Furthermore, the disassembling mechanism (11) comprises an upper cover (111), a circular groove (112) and a slot (113), the upper cover (111) is installed above the first slot (10), the circular groove (112) is formed in the surface of the upper cover (111), the slot (113) is formed in the side face of the upper cover (111), the size of the upper cover (111) is matched with that of the first slot (10), and the circular groove (112) is uniformly distributed on the upper cover (111).

Furthermore, the fixing device (12) comprises a clamping block (1201), a fifth inner groove (1202), a second groove (1203), a spring (1204), an insert (1205) and a handle (1206), the clamping block (1201) is fixed at the bottom of the frame body (5), the fifth inner groove (1202) is formed in the clamping block (1201), the fifth inner groove (1202) is formed in the side surface of the clamping block (1201), the fifth inner groove (1202) is communicated with the second groove (1203), the spring (1204) is installed in the fifth inner groove (1202) in the clamping block (1201), the insert (1205) is connected to one end of the spring (1204), the handle (1206) is fixed on the side surface of the insert (1205), and the handle (1206) transversely penetrates through the second groove (1203).

Furthermore, the size of the interior of the fifth inner groove (1202) is matched with the size of the exterior of an insert block (1205), the insert block (1205) and a clamping block (1201) form a telescopic structure through the elasticity of a spring (1204), the size of the insert block (1205) is matched with the size of a slot (113), the frame body (5) and the upper cover (111) form a clamping structure through the insert block (1205) and the slot (113), the number of the fixing devices (12) is four, the 4 fixing devices (12) are uniformly distributed on the upper cover (111), and the positions of the fixing devices (12) and the slot (113) correspond.

The utility model has the advantages that:

1. the device twists the telescopic link in supporting mechanism, can make the telescopic link rise and descend well in first inside groove and the second inside groove of first fixed block and the inside helicitic texture of second fixed block, is convenient for adjust the height of bracing piece according to the topography, can fix cultivation frame at appointed topography well, is convenient for make cultivation frame be applicable to different topography.

2. The device has installed the rotation axis between base and supporting mechanism, when using, through the effect of rotation axis, can rotate the cultivation frame well, the angle of cultivation frame is good adjusted as required to be convenient for suitably.

3. The device is when using needs to get the material, in detaching mechanism, holds the handle, to the inside inserted block that presses of fixture block, through the effect of spring, can make the inserted block compress to the inside fifth inside groove of fixture block along the second fluting well, later extrudees fixing device in proper order, is convenient for make fixing device and slot phase separation, can take out the upper cover of cultivation have the plant well, is convenient for take out the plant from the circular slot of upper cover, does benefit to and gets the material.

4. The device rotates the third fixed block in installation mechanism, through the drive of pivot, can make the third fixed block of support body bottom twist the dead lever upper end of closing at the base upper surface well, makes the dead lever twist and closes in the inside third inside groove of third fixed block, can fix the support body that splices well above the base well.

5. The device is in splicing mechanism, twist the connecting block that splices piece one end and close in a support body bottom outside, be convenient for make during the outside lug block of connecting block advances the recess of fourth inside groove inner wall, later twist the splice piece other end and close outside the connecting block of another support body upper surface, then make the outside lug block of connecting block advance the recess of fourth inside groove inner wall, can make the connecting block of a support body bottom and the connecting block of another support body upper surface be connected through the splice piece well, be convenient for fix 2 adjacent support bodies 5, be convenient for splice and dismantle cultivation frame.

6. The device makes up into three-dimensional triangular structure with the bracing piece among the supporting mechanism in supporting mechanism, when placing, can strengthen the stability of cultivation frame well.

Drawings

Fig. 1 is a schematic structural view of a soilless culture frame which is suitable for different terrains and is convenient for taking materials for agriculture.

Fig. 2 is a structural schematic diagram of a supporting mechanism of a soilless culture frame which is suitable for different terrains and is convenient for taking materials for agriculture.

Fig. 3 is an enlarged structural schematic diagram of part a of a soilless culture frame which is suitable for different terrains and is convenient for taking materials for agriculture.

Fig. 4 is a schematic structural view of a splicing mechanism of a soilless culture frame which is suitable for different terrains and is convenient for taking materials for agriculture.

Fig. 5 is a structural schematic diagram of a disassembly mechanism of the soilless culture frame which is suitable for different terrains and is convenient for taking materials for agriculture.

Fig. 6 is a partial structural schematic diagram of a disassembling mechanism of a soilless culture frame which is suitable for different terrains and is convenient for taking materials for agriculture.

Fig. 7 is an enlarged structural schematic diagram of a part B of a soilless culture frame which is suitable for different terrains and is convenient for taking materials for agriculture.

The text labels shown in the figures are represented as: 1. the device comprises a base, 2, a rotating shaft, 3, a supporting mechanism, 31, a first fixing block, 32, a first internal groove, 33, a supporting rod, 34, a second fixing block, 35, a second internal groove, 36, an expansion rod, 4, a fixing rod, 5, a frame body, 6, an installation mechanism, 61, a rotating shaft, 62, a third fixing block, 63, a third internal groove, 7, a connecting block, 8, a bump, 9, a splicing mechanism, 91, a splicing block, 92, a fourth internal groove, 93, a groove, 10, a first open groove, 11, a dismounting mechanism, 111, an upper cover, 112, a circular groove, 113, an insert groove, 12, a fixing device, 1201, a fixture block, 1202, a fifth internal groove, 1203, a second open groove, 1204, a spring, 1205, an insert block, 1206 and a handle.

Detailed Description

In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.

As shown in fig. 1-7, the specific structure of the present invention is: a soilless culture frame suitable for different terrains and convenient for taking materials for agriculture comprises a base 1, a rotating shaft 2, a supporting mechanism 3, a fixing rod 4, a frame body 5, an installing mechanism 6, a connecting block 7, a lug 8, a splicing mechanism 9, a first groove 10, a detaching mechanism 11 and a fixing device 12, wherein the rotating shaft 2 is fixed at the bottom of the base 1, the supporting mechanism 3 is installed below the rotating shaft 2, the fixing rod 4 is fixed on the upper surface of the base 1, the frame body 5 is installed above the fixing rod 4, the installing mechanism 6 is fixed at the bottom of the frame body 5, the connecting block 7 is fixed on the upper surface and the lower surface of one side of the frame body 5, the lug 8 is installed at one end of the connecting block 7, which is far away from the frame body 5, the splicing mechanism 9 is sleeved outside the connecting block 7 at the joint part between the 2 frame bodies, a detaching mechanism 11 is arranged above the first slot 10, and the fixing device 12 is fixed on the inner wall of the first slot 10.

Preferably, the supporting mechanism 3 includes a first fixing block 31, a first inner groove 32, a supporting rod 33, a second fixing block 34, a second inner groove 35 and an expansion rod 36, the first fixing block 31 is fixed at the bottom of the rotating shaft 2, the first inner groove 32 is formed in the first fixing block 31, the supporting rod 33 is installed below the first fixing block 31, the second fixing block 34 is fixed at the upper end of the supporting rod 33, the second inner groove 35 is formed in the second fixing block 34, one end of the expansion rod 36 is screwed in the first inner groove 32, and the other end of the expansion rod 36 is screwed in the second inner groove 35.

Preferably, the surfaces of the first inner groove 32, the second inner groove 35 and the expansion link 36 are both in a threaded structure, the internal dimensions of the first inner groove 32 and the second inner groove 35 are both matched with the external dimensions of the expansion link 36, and the first inner groove 32 and the second inner groove 35 are in threaded connection through the expansion link 36.

Preferably, the mounting mechanism 6 includes a rotating shaft 61, a third fixing block 62 and a third inner groove 63, the rotating shaft 61 is fixed at the bottom of the frame body 5, the third fixing block 62 is fixed at the bottom of the rotating shaft 61, and the third inner groove 63 is formed in the third fixing block 62.

Preferably, the third fixing block 62 forms a rotating structure with the frame body 5 through the rotating shaft 61, the rotating angle range of the third fixing block 62 is 0-360 degrees, both the inside of the third inner groove 63 and the upper end point of the outside of the fixing rod 4 are in a threaded structure, and the third fixing block 62 is in threaded connection with the fixing rod 4 through the third inner groove 63.

Preferably, the splicing mechanism 9 includes a splicing block 91, a fourth inner groove 92 and a groove 93, the splicing block 91 is installed on the connecting block 7 between 2 frame bodies 5, the fourth inner groove 92 is formed inside the splicing block 91, the groove 93 is formed in the inner wall of the fourth inner groove 92 near the middle position, and the projection 8 is placed in the groove 93.

Preferably, the grooves 93 are symmetrically arranged about the transverse central axis of the splice block 91, the diameter of the grooves 93 is equal to the diameter of the protrusions 8, and the inner dimension of the fourth inner groove 92 is identical to the outer dimension of the connecting block 7.

Preferably, the detaching mechanism 11 includes an upper cover 111, a circular groove 112 and a slot 113, the upper cover 111 is installed above the first slot 10, the circular groove 112 is formed on the surface of the upper cover 111, the slot 113 is formed on the side surface of the upper cover 111, the size of the upper cover 111 is matched with the size of the first slot 10, and the circular grooves 112 are uniformly distributed on the upper cover 111.

Preferably, the fixing device 12 includes a fixture block 1201, a fifth inner groove 1202, a second slot 1203, a spring 1204, an insert 1205 and a handle 1206, the fixture block 1201 is fixed at the bottom of the frame body 5, the fifth inner groove 1202 is formed inside the fixture block 1201, the fifth inner groove 1202 is formed on the side surface of the fixture block 1201, the fifth inner groove 1202 is communicated with the second slot 1203, the spring 1204 is installed in the fifth inner groove 1202 inside the fixture block 1201, the insert 1205 is connected to one end of the spring 1204, the handle 1206 is fixed on the side surface of the insert 1205, and the handle 1206 traverses the second slot 1203.

Preferably, the size of the interior of the fifth inner groove 1202 is matched with the size of the exterior of the insert 1205, the insert 1205 forms a telescopic structure with the latch 1201 through the elasticity of the spring 1204, the size of the insert 1205 is matched with the size of the slot 113, the frame body 5 forms a clamping structure with the upper cover 111 through the insert 1205 and the slot 113, the number of the fixing devices 12 is four, the 4 fixing devices 12 are evenly distributed on the upper cover 111, and the positions of the fixing devices 12 correspond to the positions of the slot 113.

Before the agricultural soilless culture frame which is suitable for different terrains and convenient for taking materials is used, the whole agricultural soilless culture frame which is suitable for different terrains and convenient for taking materials is needed to be simply understood in structure, when the device is used, firstly, 2 frame bodies 5 are placed together, one end of a splicing block 91 is screwed outside a connecting block 7 at the bottom of one frame body 5 in a splicing mechanism 9, meanwhile, a lug 8 at the outer part of the connecting block 7 is clamped into a groove 93 in the inner wall of a fourth inner groove 92, then, the other end of the splicing block 91 is screwed outside a connecting block 7 on the upper surface of the other frame body 5, meanwhile, a lug 8 at the outer part of the connecting block 7 is clamped into a groove 93 in the inner wall of the fourth inner groove 92, then, the connecting block 7 at the bottom of one frame body 5 is connected with the connecting block 7 on the upper surface of the other frame body 5 through the splicing block 91, and 2 adjacent frame, then, according to the same operation, the remaining frame bodies 5 are sequentially spliced, then the spliced frame body 5 is placed above the base 1, then in the mounting mechanism 6, the third fixing block 62 is rotated, the third fixing block 62 at the bottom of the frame body 5 is screwed on the upper end of the fixing rod 4 on the upper surface of the base 1 by being driven by the rotating shaft 61, the fixing rod 4 is screwed in the third inner groove 63 inside the third fixing block 62, so that the spliced frame body 5 is fixed above the base 1, then the cultivation frame is placed at a designated position, then in the supporting mechanism 3, the telescopic rod 36 is screwed, so that the telescopic rod 36 rises and falls in the first inner groove 32 and the second inner groove 35 of the thread structure inside the first fixing block 31 and the second fixing block 34, so that the height of the supporting rod 33 is adjusted according to the terrain, and the cultivation frame is fixed at the designated terrain by the action of the rotating shaft 2, the cultivation shelf can be rotated, the angle of the cultivation shelf can be adjusted, when materials need to be taken in use, firstly, in the dismounting mechanism, the handle 1206 is held, the inserting block 1205 is pressed towards the inside of the clamping block 1201, under the action of the spring 1204, the inserting block 1205 is compressed into the fifth inner groove 1202 in the clamping block 1201 along the second groove 1203, the fixing device 12 is sequentially pressed, the fixing device 12 is separated from the slot 113, then the upper cover 111 with the plants cultivated therein is taken out, and then the plants are taken out of the circular groove 112 of the upper cover 111.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to assist in understanding the methods and their core concepts. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the above technical features can be combined in a proper manner; the application of these modifications, variations or combinations, or the application of the concepts and solutions of the present invention in other contexts without modification, is not intended to be considered as a limitation of the present invention.

Claims (10)

1. The utility model provides an agricultural is with being suitable for different topography and conveniently getting soilless culture frame of material, includes base (1), supporting mechanism (3), installation mechanism (6), connecting block (7), splicing mechanism (9), first fluting (10) and fixing device (12), its characterized in that: base (1) bottom is fixed with rotation axis (2), supporting mechanism (3) are installed in rotation axis (2) below, base (1) upper surface is fixed with dead lever (4), support body (5) are installed to dead lever (4) top, installation mechanism (6) are fixed in support body (5) bottom, connecting block (7) are fixed at support body (5) one side upper and lower surface, connecting block (7) are kept away from lug (8) have been installed to the one end of support body (5), splicing mechanism (9) cover is established 2 connecting block (7) outside of meeting between support body (5), first fluting (10) are seted up at support body (5) upper surface, disassembly body (11) are installed to first fluting (10) top, fixing device (12) are fixed at first fluting (10) inner wall.

2. The agricultural soilless culture frame applicable to different terrains and convenient for taking materials as claimed in claim 1, which is characterized in that: the supporting mechanism (3) comprises a first fixing block (31), a first inner groove (32), a supporting rod (33), a second fixing block (34), a second inner groove (35) and a telescopic rod (36), the first fixing block (31) is fixed to the bottom of the rotating shaft (2), the first inner groove (32) is formed in the first fixing block (31), the supporting rod (33) is installed below the first fixing block (31), the second fixing block (34) is fixed to the upper end of the supporting rod (33), the second inner groove (35) is formed in the second fixing block (34), one end of the telescopic rod (36) is screwed in the first inner groove (32), and the other end of the telescopic rod (36) is screwed in the second inner groove (35).

3. The agricultural soilless culture frame applicable to different terrains and convenient for taking materials as claimed in claim 2, which is characterized in that: the surfaces of the first inner groove (32), the second inner groove (35) and the telescopic rod (36) are in threaded structures, the inner sizes of the first inner groove (32) and the second inner groove (35) are matched with the outer size of the telescopic rod (36), and the first inner groove (32) and the second inner groove (35) are in threaded connection through the telescopic rod (36).

4. The agricultural soilless culture frame applicable to different terrains and convenient for taking materials as claimed in claim 1, which is characterized in that: the mounting mechanism (6) comprises a rotating shaft (61), a third fixing block (62) and a third inner groove (63), the rotating shaft (61) is fixed at the bottom of the frame body (5), the third fixing block (62) is fixed at the bottom of the rotating shaft (61), and the third inner groove (63) is formed in the third fixing block (62).

5. The agricultural soilless culture frame suitable for different terrains and convenient for taking materials as claimed in claim 4, wherein: the third fixing block (62) and the frame body (5) form a rotating structure through a rotating shaft (61), the rotating angle range of the third fixing block (62) is 0-360 degrees, the inner part of the third inner groove (63) and the outer upper end point of the fixing rod (4) are both of threaded structures, and the third fixing block (62) is in threaded connection with the fixing rod (4) through the third inner groove (63).

6. The agricultural soilless culture frame applicable to different terrains and convenient for taking materials as claimed in claim 1, which is characterized in that: the splicing mechanism (9) comprises splicing blocks (91), fourth inner grooves (92) and grooves (93), the splicing blocks (91) are installed on the connecting blocks (7) between the frame bodies (5), the fourth inner grooves (92) are formed in the splicing blocks (91), the grooves (93) are formed in the inner walls of the fourth inner grooves (92) close to the middle positions, and the convex blocks (8) are placed in the grooves (93).

7. The agricultural soilless culture frame suitable for different terrains and convenient for taking materials as claimed in claim 6, wherein: the grooves (93) are symmetrically arranged about the transverse central axis of the splicing block (91), the diameter of each groove (93) is equal to that of the corresponding bump (8), and the inner size of the fourth inner groove (92) is matched with the outer size of the connecting block (7).

8. The agricultural soilless culture frame applicable to different terrains and convenient for taking materials as claimed in claim 1, which is characterized in that: the disassembly mechanism (11) comprises an upper cover (111), a circular groove (112) and a slot (113), the upper cover (111) is installed above the first slot (10), the circular groove (112) is formed in the surface of the upper cover (111), the slot (113) is formed in the side face of the upper cover (111), the size of the upper cover (111) is matched with that of the first slot (10), and the circular groove (112) is uniformly distributed on the upper cover (111).

9. The agricultural soilless culture frame applicable to different terrains and convenient for taking materials as claimed in claim 1, which is characterized in that: the fixing device (12) comprises a clamping block (1201), a fifth inner groove (1202), a second groove (1203), a spring (1204), an insert block (1205) and a handle (1206), the clamping block (1201) is fixed at the bottom of the frame body (5), the fifth inner groove (1202) is formed in the clamping block (1201), the fifth inner groove (1202) is formed in the side surface of the clamping block (1201), the fifth inner groove (1202) is communicated with the second groove (1203), the spring (1204) is installed in the fifth inner groove (1202) in the clamping block (1201), one end of the spring (1204) is connected with the insert block (1205), the handle (1206) is fixed on the side surface of the insert block (1205), and the handle (1206) transversely penetrates through the second groove (1203).

10. The agricultural soilless culture frame applicable to different terrains and convenient for taking materials as claimed in claim 9, wherein: the size of the interior of the fifth inner groove (1202) is matched with the size of the exterior of an insert block (1205), the insert block (1205) and a clamping block (1201) form a telescopic structure through the elasticity of a spring (1204), the size of the insert block (1205) is matched with the size of a slot (113), the frame body (5) and the upper cover (111) form a clamping structure through the insert block (1205) and the slot (113), the number of the fixing devices (12) is four, the 4 fixing devices (12) are uniformly distributed on the upper cover (111), and the positions of the fixing devices (12) are corresponding to the positions of the slot (113).

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