A portable measuring device for forestry planning and design

Abstract

A portable measuring device for forestry planning and design, the present application relates to the technical field of measuring tool for agricultural and forestry planning, the measuring device is fixedly arranged on the upper surface of the base, the cover plate is three, and is rotatably arranged on the side of the base through bearings at equal angles, the storage assembly is arranged on the cover plate, and the supporting assembly is arranged in the storage assembly; Equal angle distribution of cover plate is arranged, and the supporting assembly which can be stored in the cover plate is arranged, then the cover plate is opened, and the supporting assembly is installed and expanded, the device can be erected into a tripod, and the erection of the measuring device is realized, and the volume of the device is reduced after being folded, and the device can also be used as a box for loading the measuring device, so that the whole device is convenient to carry.

Description

Technical Field

[0001] This invention relates to the field of measuring equipment technology for agricultural and forestry planning, and specifically to a portable measuring device for forestry planning and design. Background Technology

[0002] When planning forest farms, it is necessary to plant suitable crops in appropriate plots based on the actual geographical conditions of the forest farm. Usually, when planning forest plots, various geographical data are measured using devices for distance measurement, height measurement, and slope measurement. This data is used as a basis for dividing relevant plots. However, the existing equipment is set up using tripods. When carrying the equipment, in addition to carrying the relevant measuring equipment, the tripod also needs to be carried. This results in too much equipment being carried, which is not conducive to trekking in the forest farm. Therefore, it is necessary to improve the relevant equipment to reduce its size and facilitate its carrying. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings and deficiencies of the prior art by providing a portable measuring device for forestry planning and design. This device features an equiangularly distributed cover plate and a support component that can be stored within the cover plate. When the cover plate is opened and the support component is installed and unfolded, the device can be set up as a tripod, thus enabling the measurement device to be erected. Furthermore, the device's size is reduced when folded up, and it can also be used as a box to carry the measuring device, making it easier to carry the entire device.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] It includes a base and a measuring device, wherein the measuring device is fixedly mounted on the upper surface of the base, and it also includes:

[0006] The cover plate, of which there are three, is screwed at equal angles onto the side of the base via bearings;

[0007] Storage component, wherein the storage component is disposed on the cover plate;

[0008] A support component, wherein the support component is disposed within the storage component;

[0009] In use, unfold the cover plate and place it on the side of the base. Then unfold the support assembly from the storage assembly to support the base. The measuring device is then placed on the base for measurement.

[0010] Preferably, the storage component includes:

[0011] The storage slot is formed on the inner side wall of the cover plate;

[0012] The upper positioning groove is formed on the upper inner side wall of the storage groove;

[0013] The lower positioning groove is formed on the lower inner side wall of the storage groove;

[0014] The limiting groove is formed inside the cover plate, and is positioned above the upper positioning groove, and the limiting groove is connected to the upper positioning groove.

[0015] The guide groove is formed inside the cover plate, and the lower end of the guide groove passes through the lower side wall of the cover plate and then opens. The guide groove is set on one side of the storage groove. The storage groove, the upper positioning groove, the lower positioning groove, and the limiting groove are all connected to the guide groove.

[0016] In use, the support component is stored in the cavity formed by the storage slot, upper positioning slot, lower positioning slot and limiting slot. When the support component is taken out, it is moved into the guide slot and taken out through the lower port of the guide slot.

[0017] Preferably, the support component comprises:

[0018] A limiting block, wherein there are several limiting blocks, and they are slidably disposed in the limiting groove;

[0019] The support rod is fixed to the limiting block and, after passing through the upper positioning groove, is placed in the storage groove.

[0020] The insertion rod is fixedly installed at the lower end of the support rod, and the lower end of the insertion rod is inserted into the lower positioning groove.

[0021] The socket is located inside the support rod, and its upper end is opened after passing through the upper side wall of the support rod.

[0022] A snap-fit ​​assembly, wherein the snap-fit ​​assembly is disposed on the support rod;

[0023] In use, the support rods are taken out of the storage slot and strung together one by one to form a support leg, which, together with the base, forms a tripod for setting up the measuring device on the base. When taking out the support rod, slide the limiting block to move it from the limiting groove to the guide groove. Then move the support rod downward to pull the support rod and the limiting block out of the limiting groove. When stringing the support rods together, simply insert the support rod into the insert at the lower end of the adjacent support rod above it through the insertion hole, and use the snap-fit ​​component to limit and lock the inserted support rod and insert.

[0024] Preferably, the snap-fit ​​assembly includes:

[0025] The inclined wedge plate is screwed onto the side wall of the support rod via a rotating shaft with a torsion spring. The support rod has an opening that is connected to the insertion hole, and the inclined wedge plate is inserted into the insertion hole through the opening.

[0026] The locking hole is located on the side wall of the insertion rod;

[0027] When in use, insert the rod into the socket, the rod presses against the side of the wedge plate, which pushes the wedge plate open. When the rod moves to the point where the socket is aligned with the wedge plate, the wedge plate is inserted into the socket. When the rod is pulled out of the socket, manually open the wedge plate and pull it out of the socket, and then pull the rod out of the socket.

[0028] Preferably, it further comprises:

[0029] The reset top plate is disposed in the limiting groove and abuts against the limiting block on the side away from the guide groove.

[0030] The guide rod is fixedly installed on the wall opposite to the limit block on the reset top plate;

[0031] The guide hole is located on the wall of the limiting groove away from the guide groove, and the guide rod is movably inserted into the guide hole.

[0032] A reset spring is sleeved on a guide rod, with one end of the reset spring tube fixedly mounted on the reset top plate and the other end of the reset spring fixedly mounted on the inner wall of the guide hole.

[0033] In use, the guide rod is inserted into the guide hole for guidance, the reset spring abuts against the reset top plate, and then the reset top plate abuts against the limit block. After a limit block is moved from the limit groove to the guide groove and then pulled out of the guide groove, the reset top plate pushes the limit block in the limit groove to move, and then pushes the next limit block to move into the guide groove.

[0034] Preferably, a support plate is spun on the inner wall of the cover plate via a rotating shaft with a torsion spring, and the support plate is located to the side of the upper positioning groove. An opening in the side wall of the cover plate is connected to the guide groove, and the support plate is inserted into the guide groove through the opening. A limiting plate is spun on the inner wall of the cover plate via a rotating shaft with a torsion spring, and the limiting plate is located below the lower positioning groove. An opening in the side wall of the cover plate is connected to the guide groove, and the limiting plate is inserted into the guide groove through the opening.

[0035] In use, the support plate is inserted into the guide groove, and then the limiting block slides from the limiting groove into the guide groove. The support plate abuts against the lower surface of the limiting block to support and limit the limiting block. When the limiting block is moved in the guide groove, the support plate is first opened, and the limiting block on the support rod placed in the guide groove is moved to the bottom of the support plate. Then the limiting plate is opened, and the limiting block on the adjacent support rod on the lower side is moved to the bottom of the limiting plate, thereby moving one support rod out of the guide groove and moving the support rod in the storage groove into the guide groove.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] 1. A cover plate is set on the base, and a storage component is opened inside the cover plate. The support component is disassembled and placed in the storage component. Then, after opening the cover plate and assembling the support component, a tripod structure is formed after connecting with the base, thereby supporting and erecting the measuring device on the base.

[0038] 2. A storage slot is provided on the cover plate to store the support rod. A limiting block is provided on the support rod, which works in conjunction with the limiting slot that passes through the storage slot to limit the arrangement of the support rod. The lower end of the support rod is provided with an insertion rod and the upper end is provided with an insertion hole, thus forming a connection structure for the support rod. A guide slot is provided through one side of the storage slot, which works in conjunction with the limiting block to achieve a docking connection between the support rod and the cover plate, thus forming an easy-to-store and unfold connection of the whole device, making the whole device easy to carry. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the present invention.

[0040] Figure 2 yes Figure 1 Front view.

[0041] Figure 3 yes Figure 1 Top view.

[0042] Figure 4 yes Figure 2 AA section view in the image.

[0043] Figure 5 This is a schematic diagram of the cover plate structure in this invention. Figure 1 .

[0044] Figure 6 This is a schematic diagram of the cover plate structure in this invention. Figure 2 .

[0045] Figure 7 This is a schematic diagram of the support component in this invention.

[0046] Figure 8 This is a schematic diagram of the structure of the cover plate being closed in this invention.

[0047] Explanation of reference numerals in the attached drawings: 1. Base; 2. Measuring device; 3. Cover plate; 4. Storage assembly; 4-1. Storage groove; 4-2. Upper positioning groove; 4-3. Lower positioning groove; 4-4. Limiting groove; 4-5. Guide groove; 5. Support assembly; 5. Limiting block; 5-1. Support rod; 5-2. Insert rod; 5-3. Insertion hole; 5-4. Snap-fit ​​assembly; 6. Wedge plate; 6-1. Snap hole; 6-2. Reset top plate; 7. Guide rod; 8. Guide hole; 9. Reset spring; 10. Support plate; 11. Limiting plate; 12. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Example 1:

[0050] like Figure 1 , 3 As shown in Figure 8, this embodiment includes a base 1 and a measuring device 2, wherein the measuring device 2 is fixedly disposed on the upper surface of the base 1, and it further includes:

[0051] Cover plate 3, there are three cover plates 3, and they are screwed onto the side of the base 1 at equal angles via bearings;

[0052] Storage component 4 is disposed on cover plate 3;

[0053] Support component 5 is disposed within the storage component 4;

[0054] With the above design, when the device is stored as a whole, the three cover plates 3 are closed together, forming a closed box structure with the base 1, which covers the measuring device 2 installed on the base 1. The outer surface of the cover plate 3 is provided with a pin. When the cover plate 3 is closed, the adjacent cover plates 3 are connected and locked by the pin. When in use, the cover plate 3 is opened and placed on the side of the base 1. The support component 5 is disassembled into multiple independent parts and stored in the storage component 4. The support component 5 is taken out and assembled in series to form a rod shape. The assembled support component 5 is then connected to the cover plate 3, forming a tripod structure with the base 1. The measuring device 2 is then erected using the tripod.

[0055] Example 2:

[0056] like Figure 1-8 As shown, based on the above embodiment 1, the support component 5 includes:

[0057] Limiting block 5-1, wherein several independently configured limiting blocks 5-1 are provided;

[0058] Support rod 5-2, wherein the support rod 5-2 is inserted and fixed on the limiting block 5-1;

[0059] Insert rod 5-3, wherein the insert rod 5-3 is fixedly installed at the lower end of the support rod 5-2;

[0060] The insertion hole 5-4 is formed inside the support rod 5-2, and the upper end of the insertion hole 5-4 is set after passing through the upper side wall of the support rod 5-2.

[0061] The inclined wedge plate 6-1 is screwed onto the side wall of the support rod 5-2 via a rotating shaft with a torsion spring. The support rod 5-2 has an opening that communicates with the insertion hole 5-4. The inclined wedge plate 6-1 is inserted into the insertion hole 5-4 through the opening.

[0062] The locking hole 6-2 is provided on the side wall of the insertion rod 5-3;

[0063] Using the above design scheme, when assembling the support rod 5-2, the insert rod 5-3 is inserted into the insertion hole 5-4, thereby connecting the two support rods 5-2. When the insert rod 5-3 is inserted into the insertion hole 5-4, the lower end of the insert rod 5-3 pushes the wedge plate 6-1 to open, and then the wedge plate 6-1 slides against the side wall of the insert rod 5-3. When the insert rod 5-3 moves to the point where the insertion hole 6-2 is aligned with the wedge plate 6-1, the wedge plate 6-1 resets and inserts into the insertion hole 6-2, thereby achieving the locking of the support rod 5-2 with the insert rod 5-3 on the adjacent support rod 5-2, that is, achieving the locking of the two support rods 5-2. When disassembling the locked support rods 5-2, the wedge plate 6-1 is manually opened and pulled out from the insertion hole 6-2, thereby pulling the insert rod 5-3 out from the insertion hole 5-4, that is, separating the two support rods 5-2.

[0064] Example 3:

[0065] like Figure 1-8 As shown, based on the above embodiment 2, the storage component 4 includes:

[0066] Storage slot 4-1, wherein the storage slot 4-1 is formed on the inner side wall of the cover plate 3;

[0067] Upper positioning groove 4-2 is formed on the upper inner side wall of the storage groove 4-1;

[0068] The lower positioning groove 4-3 is formed on the lower inner side wall of the storage groove 4-1;

[0069] The limiting groove 4-4 is formed inside the cover plate 3. The limiting groove 4-4 is set above the upper positioning groove 4-2 and is connected to the upper positioning groove 4-2.

[0070] The limiting block 5-1 is slidably set in the limiting groove 4-4, and then the support rod 5-2 passes through the upper positioning groove 4-2 and is set in the storage groove 4-1, and the insertion rod 5-3 at the lower end of the support rod 5-2 is inserted into the lower positioning groove 4-3.

[0071] Guide groove 4-5 is formed inside cover plate 3, and the lower end of guide groove 4-5 is opened after passing through the lower side wall of cover plate 3. Guide groove 4-5 is set on one side of storage groove 4-1. Storage groove 4-1, upper positioning groove 4-2, lower positioning groove 4-3, and limiting groove 4-4 are all connected to guide groove 4-5.

[0072] With the above design, during use, the uppermost support rod 5-2 and the limiting block 5-1 of the assembled support rods 5-2 are inserted into the guide groove 4-5, thereby connecting the assembled support rods 5-2 with the cover plate 3, that is, connecting with the base 1. The remaining unassembled support rods 5-2 are placed in the storage groove 4-1, and the limiting block 5-1 on the support rod 5-2 slides into the limiting groove 4-4. When using the support rod 5-2 for extension, first pull out the support rod 5-2 placed in the guide groove 4-5, then the support rod 5-2 placed in the storage groove 4-1 drives the limiting block 5-1 on it to slide into the guide groove 4-5. Then, push the pulled-out support rod 5-2 back up, thus completing the connection and installation with the newly entered support rod 5-2 in the guide groove 4-5.

[0073] Example 4:

[0074] like Figure 1-8 As shown, based on the above embodiment 3, it further includes:

[0075] The reset top plate 7 is disposed in the limiting groove 4-4 and abuts against the limiting block 5-1 on the side away from the guide groove 4-5;

[0076] Guide rod 8, the guide rod 8 is fixedly installed on the wall opposite to the reset top plate 7 and the limiting block 5-1;

[0077] Guide hole 9, the guide hole 9 is opened on the wall of the limiting groove 4-4 away from the guide groove 4-5, and the guide rod 8 is movably inserted into the guide hole 9;

[0078] The reset spring 10 is sleeved on the guide rod 8. One end of the reset spring 10 is fixedly set on the reset top plate 7, and the other end of the reset spring 10 is fixedly set on the inner wall of the guide hole 9.

[0079] The support plate 11 is spun onto the inner wall of the cover plate 3 via a rotating shaft with a torsion spring, and the support plate 11 is located on the side of the upper positioning groove 4-2. The opening on the cover plate 3 is connected to the upper end of the guide groove 4-5, and the support plate 11 is inserted into the upper interior of the guide groove 4-5 through the opening.

[0080] The limiting plate 12 is spun onto the inner wall of the cover plate 3 via a rotating shaft with a torsion spring, and the support plate 11 is located below the lower positioning groove 4-3. The opening on the cover plate 3 is connected to the lower end of the guide groove 4-5, and the limiting plate 12 is inserted into the lower interior of the guide groove 4-5 through the hole.

[0081] With the above design, when the installed support rod 5-2 is placed in the guide groove 4-5, the support plate 11 abuts against the lower surface of the limiting block 5-1 at the upper end of the support rod 5-2. By locking the limiting block 5-1, the installed support rod 5-2 is locked to the cover plate 3. When the support rod 5-2 is pulled out from the guide groove 4-5, the support plate 11 is opened, which allows the limiting block 5-1 and the support rod 5-2 to move. When the limiting block 5-1 moves in the guide groove 4-5, it is limited by the limiting plate 12 below the guide groove 4-5 to prevent the support rod 5-2 from being completely pulled out. After the support rod 5-2 moves to make room, the reset top plate 7 pushes the limiting block 5-1 in the limiting groove 4-4, pushing the support rod 5-2 in the storage groove 4-1 into the guide groove 4-5.

[0082] When the support rod 5-2 is moved out of the guide groove 4-5, the support plate 11 is opened first, and the limiting block 5-1 on the support rod 5-2 placed in the guide groove 4-5 is moved to the bottom of the support plate 11. Then the limiting plate 12 is opened, and the limiting block 5-1 on the lower adjacent support rod 5-2 is moved to the bottom of the limiting plate 12, thereby moving one support rod 5-2 out of the guide groove 4-5 and moving the support rod 5-2 in the storage groove 4-1 into the guide groove 4-5.

[0083] The technical advantages achieved by adopting the above technical solution are as follows:

[0084] 1. A cover plate 3 is provided on the base 1, and a storage component 4 is opened in the cover plate 3. The support component 5 is disassembled and placed in the storage component 4. After opening the cover plate 3 and assembling the support component 5, a tripod structure is formed after connecting with the base 1, thereby supporting and erecting the measuring device 2 on the base 1.

[0085] 2. A storage slot 4-1 is provided on the cover plate 3 to store the support rod 5-2. A limiting block 5-1 is provided on the support rod 5-2, which, in conjunction with the limiting slot 4-4 that passes through the storage slot 4-1, achieves the limiting arrangement of the support rod 5-2. An insertion rod 5-3 is provided at the lower end of the support rod 5-2, and an insertion hole 5-4 is provided at the upper end, thus forming a connection structure for the support rod 5-2. A guide slot 4-5 is provided through one side of the storage slot 4-1, which, in conjunction with the limiting block 5-1, achieves the docking connection between the support rod 5-2 and the cover plate 3, thus forming an easy-to-store and unfold connection of the entire device, facilitating the carrying of the entire device. For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made for some technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A portable measuring device for forestry planning and design, comprising a base (1) and a measuring device (2), wherein the measuring device (2) is fixedly arranged on the upper surface of the base (1); characterized in that, It also contains: Cover plate (3), the cover plate (3) is three, and the equiangular bearing is rotated on the side of the base (1); Storage assembly (4), the storage assembly (4) is arranged on the cover plate (3); Support assembly (5), the support assembly (5) is arranged in the storage assembly (4); In use, the cover plate (3) is unfolded and placed on the side of the base (1), then the support assembly (5) is unfolded from the storage assembly (4), and then the base (1) is supported by the support assembly (5), and then the measuring device (2) is measured on the base (1); The storage assembly (4) contains: Storage slot (4-1), the storage slot (4-1) is opened on the inner side wall of the cover plate (3); Upper positioning groove (4-2), the upper positioning groove (4-2) is opened on the upper inner side wall of the storage slot (4-1); Lower positioning groove (4-3), the lower positioning groove (4-3) is opened on the lower inner side wall of the storage slot (4-1); Limiting groove (4-4), the limiting groove (4-4) is opened in the cover plate (3), the limiting groove (4-4) is arranged above the upper positioning groove (4-2), and the limiting groove (4-4) is arranged through the upper positioning groove (4-2); Guide groove (4-5), the guide groove (4-5) is opened in the cover plate (3), and the lower end of the guide groove (4-5) is arranged through the lower side wall of the cover plate (3) and opened, the guide groove (4-5) is arranged on one side of the storage slot (4-1), the storage slot (4-1), the upper positioning groove (4-2), the lower positioning groove (4-3) and the limiting groove (4-4) are arranged through the guide groove (4-5); In use, the cavity formed by the storage slot (4-1), the upper positioning groove (4-2), the lower positioning groove (4-3) and the limiting groove (4-4) is used to store the support assembly (5), when the support assembly (5) is taken out, the support assembly (5) is moved into the guide groove (4-5), and the support assembly (5) is taken out through the lower port of the guide groove (4-5); The support assembly (5) contains: Limiting block (5-1), the limiting block (5-1) is a plurality of, and is slidably arranged in the limiting groove (4-4); Support rod (5-2), the support rod (5-2) is fixedly arranged on the limiting block (5-1), and the support rod (5-2) is arranged in the storage slot (4-1) after passing through the upper positioning groove (4-2); Insert rod (5-3), the insert rod (5-3) is fixedly arranged on the lower end of the support rod (5-2), and the lower end of the insert rod (5-3) is inserted into the lower positioning groove (4-3); Insert hole (5-4), the insert hole (5-4) is opened in the support rod (5-2), and the upper end of the insert hole (5-4) is arranged through the upper side wall of the support rod (5-2) and opened; Clamping assembly (6), the clamping assembly (6) is arranged on the support rod (5-2); In use, the support rods (5-2) are taken out from the storage slots (4-1) one by one, and then the support rods (5-2) are connected in series to form a support leg, and then the support leg is combined with the base (1) to form a tripod, and the measuring device (2) on the base (1) is erected, when the support rod (5-2) is taken out, the sliding limit block (5-1) is moved from the limit slot (4-4) to the guide slot (4-5), then the support rod (5-2) is moved downward, the support rod (5-2) and the limit block (5-1) are taken out from the limit slot (4-4), when the support rods (5-2) are connected in series, the support rod (5-2) is sleeved on the insertion rod (5-3) at the lower end of the adjacent support rod (5-2) above through the insertion hole (5-4), and the sleeved support rod (5-2) and insertion rod (5-3) are limited and locked by the clamping assembly (6); The reset top plate (7) is arranged in the limit slot (4-4), and the reset top plate (7) is arranged on the limit block (5-1) away from the guide slot (4-5); The guide rod (8) is fixedly arranged on the wall away from the limit block (5-1) on the side of the reset top plate (7); The guide hole (9) is arranged on the wall away from the guide slot (4-5) on the side of the limit slot (4-4), and the guide rod (8) is movably arranged in the guide hole (9); The reset spring (10) is sleeved on the guide rod (8), one end of the reset spring (10) is fixedly arranged on the reset top plate (7), and the other end of the reset spring (10) is fixedly arranged on the inner side wall of the guide hole (9); In use, the guide rod (8) is inserted into the guide hole (9) for guidance, the reset spring (10) abuts against the reset top plate (7), and then the reset top plate (7) abuts against the limit block (5-1), and then after moving one limit block (5-1) from the limit slot (4-4) to the guide slot (4-5) and taking it out from the guide slot (4-5), the reset top plate (7) pushes the limit block (5-1) in the limit slot (4-4) to move, and then the next limit block (5-1) is pushed and moved to the guide slot (4-5).

2. A portable measuring device for forestry planning and design according to claim 1, characterized in that: The clamping assembly (6) comprises: The inclined wedge clamping plate (6-1) is rotatably arranged on the side wall of the support rod (5-2) through the rotating shaft with the torsional spring, the hole on the support rod (5-2) is arranged through the insertion hole (5-4), and the inclined wedge clamping plate (6-1) is inserted into the insertion hole (5-4) through the hole; The clamping hole (6-2) is arranged on the side wall of the insertion rod (5-3); In use, when the insertion rod (5-3) is inserted into the insertion hole (5-4), the insertion rod (5-3) abuts against the side edge of the wedge clamping plate (6-1), thereby pushing the wedge clamping plate (6-1) to open, and when the insertion rod (5-3) moves to the position where the clamping hole (6-2) is aligned with the wedge clamping plate (6-1), the wedge clamping plate (6-1) is inserted into the clamping hole (6-2), and when the insertion rod (5-3) is pulled out of the insertion hole (5-4), the wedge clamping plate (6-1) is manually opened and pulled out of the clamping hole (6-2), and then the insertion rod (5-3) is pulled out of the insertion hole (5-4).

3. A portable measuring device for forestry planning and design according to claim 2, characterized in that: The inner side wall of the cover plate (3) is provided with a support plate (11) rotatably arranged through a rotating shaft with a torsion spring, and the support plate (11) is arranged beside the upper positioning groove (4-2); the side wall of the cover plate (3) is provided with a hole penetrating the guide groove (4-5), and the support plate (11) is inserted into the guide groove (4-5) through the hole; the inner side wall of the cover plate (3) is provided with a limiting plate (12) rotatably arranged through a rotating shaft with a torsion spring, and the limiting plate (12) is arranged below the lower positioning groove (4-3); the side wall of the cover plate (3) is provided with a hole penetrating the guide groove (4-5), and the limiting plate (12) is inserted into the guide groove (4-5) through the hole; In use, the support plate (11) is inserted into the guide groove (4-5), and then the limiting block (5-1) is slid from the limiting groove (4-4) into the guide groove (4-5), and the support plate (11) abuts against the lower surface of the limiting block (5-1) to support and limit the limiting block (5-1); when the limiting block (5-1) is moved in the guide groove (4-5), first, the support plate (11) is opened, and the limiting block (5-1) on the support rod (5-2) placed in the guide groove (4-5) is moved below the support plate (11); then the limiting plate (12) is opened, and the limiting block (5-1) on the adjacent support rod (5-2) below is moved below the limiting plate (12), so as to realize moving one support rod (5-2) out of the guide groove (4-5) and moving the support rod (5-2) in the receiving groove (4-1) into the guide groove (4-5).

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