Bottom supporting device applicable to multiple terrains and used for load node seismograph

Abstract

A bottom supporting device suitable for multiple terrains and used for a load node seismograph comprises a base plate, a spirit level and three cantilevers arranged at intervals, partial area of the top face of the base plate makes contact with the bottom face of the spirit level, a through installation hole is formed in the middle of the base plate, the side portion of the base plate is connected with the top ends of the cantilevers, and the cantilevers are arranged in the installation hole. The bottom end of the cantilever extends downwards in an inclined mode till the bottom end of the cantilever is connected with the inner end of the horizontal conical foot, a through fixing threaded hole is formed in the middle of the horizontal conical foot, and a fixing screw in threaded fit with the fixing threaded hole is correspondingly inserted into the fixing threaded hole; preferably, the base plate comprises an inner plate which is coaxially arranged and an outer plate which is annularly connected with the outer part of the inner plate, and the outer side of the inner plate is in running fit with the inner side surface of the outer plate through a connecting bearing. According to the design, the supporting firmness is high, the detection effect can be ensured, the limitation is low, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to a supporting device for a node seismograph, belonging to the field of seismic exploration, and in particular to a bottom supporting device suitable for multiple terrains for loading a node seismograph. Background Art

[0002] At present, microtremor detection in seismic exploration has significant advantages of not requiring a vibration source and being green and environmentally friendly, playing an important role in detecting shallow underground structures in cities and being increasingly widely applied.

[0003] With the wide application of microtremor detection methods, many domestic and foreign manufacturers have developed node seismographs of different models and performances. When a node seismograph is applied, its bottom needs to be connected to the ground to be detected through a supporting device. However, most of the bottom supporting devices adopted by existing node seismographs are conical bases. The supporting firmness of such conical bases is weak, and the requirements for the ground to be detected are relatively high, such as a site with uniform soil quality. Once in a non-uniform soil site, such as a soil layer containing a large amount of cobbles and gravels, bedrock or artificially hardened site, it is difficult to maintain sufficient firmness, which will affect the detection effect of the node seismograph. Especially on a terrain with a large slope, it is even more difficult to apply.

[0004] Chinese Patent with application number 202323242905.3 and publication date of July 23, 2024 discloses a node seismograph, which includes a first shell, a second shell, a load-bearing plate and a battery module; wherein, the first shell and the second shell enclose to form an accommodation cavity, the battery module is located in the accommodation cavity, the load-bearing plate is arranged in the accommodation cavity, the load-bearing plate wraps the battery module inside, the load-bearing plate includes a first plate body and second plate bodies oppositely arranged on both sides of the first plate body, the first plate body and the second plate bodies are perpendicular to each other, the first plate body is connected to the reinforcing ribs on the inner wall of the first shell, the second plate body is connected to the reinforcing ribs on the inner wall of the second shell, and the bottom of the second shell is connected to a cone. When in application, it is connected to the ground to be detected through the cone. Although this design can provide better protection for the internal battery module and extend the service life of the battery module, it still has the following defects: As described above, this design still relies on a conical base to connect to the ground. Not only is the supporting firmness weak, it is easy to shake and may gradually tilt over time, but also the quality requirements for the ground to be detected are relatively high, with strong limitations and it is difficult to be widely applied.

[0005] Disclosing the information of this background art section is only intended to increase the understanding of the overall background of the present application, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The object of the present invention is to overcome the defects and problems of weak support firmness and strong restriction in the prior art, and to provide a bottom support device for a load node seismograph that is applicable to multiple terrains and has strong support firmness and weak restriction.

[0007] To achieve the above object, the technical solution of the present invention is: a bottom support device for a load node seismograph that is applicable to multiple terrains, the bottom support device includes a chassis, a level and three cantilevers; A partial area of the top surface of the chassis is in contact with the bottom surface of the level, and a through mounting hole is provided in the middle of the chassis; The side of the chassis is connected to the top end of the cantilever, the bottom end of the cantilever extends obliquely downward until it is connected to the inner end of the horizontal cone foot, a through fixing threaded hole is provided in the middle of the horizontal cone foot, and a fixing screw rod that is threadedly engaged with it is correspondingly inserted into the fixing threaded hole, and the three cantilevers are separated from each other.

[0008] The cantilever includes a vertical part and an inclined part, the inner side surface of the vertical part is connected to the side of the chassis, the bottom end of the vertical part is connected to the top end of the inclined part, and the bottom end of the inclined part is connected to the inner end of the horizontal cone foot.

[0009] The inclined part forms an inclined angle with the gravity line, and the size of the inclined angle is from 20 degrees to 60 degrees.

[0010] The fixing screw rod includes a rod head, a rod body and a rod tip connected in sequence from top to bottom, and an external thread is provided on the side circumference of the rod body.

[0011] The rod body includes an upper smooth rod, a middle threaded rod and a lower smooth rod, an external thread is provided on the side circumference of the middle threaded rod, there is no thread on the upper smooth rod and the lower smooth rod, and the rod head, the upper smooth rod, the middle threaded rod, the lower smooth rod and the rod tip are connected in sequence from top to bottom.

[0012] The chassis includes an inner disk arranged coaxially and an outer disk annularly connected to its outside; the outer circumference of the inner disk is rotationally matched with the inner side surface of the outer disk through a connecting bearing, and the outer side surface of the outer disk is connected to the top end of the cantilever; A through mounting hole is provided in the middle of the inner disk, and a partial area of the top surface of the outer disk is in contact with the bottom surface of the level.

[0013] The mounting hole includes a cylindrical hole and at least two waist-shaped holes, the cylindrical hole is located in the middle of the inner disk, and the waist-shaped holes are arranged around the cylindrical hole.

[0014] An inner concave inner bead groove is provided on the outer circumference of the inner disk, an inner concave outer bead groove is provided on the inner side surface of the outer disk, the connecting bearing includes a connecting ring and a plurality of balls, the connecting ring includes a plurality of connecting ring rods and bead rings connected at intervals in sequence, and a ball is sleeved in each bead ring; The middle part of the ball is located within the corresponding ball sleeve ring. The inner end of the ball slides in cooperation along the inner ball groove where it is located, and the outer end of the ball slides in cooperation along the outer ball groove where it is located.

[0015] On the outer circumference of the inner disk at a position higher than the inner ball groove, a locking tooth ring is arranged in a surrounding manner. On the inner circumference of the outer disk at a position higher than the outer ball groove, a through locking rod hole is provided. A coaxial sleeve rod spring is arranged within the locking rod hole. A coaxial locking rod is arranged inside the sleeve rod spring. One end of the locking rod is connected to a locking rod head located outside the locking rod hole, the other end of the locking rod is connected to the inner end of an outer hole rod, the outer end of the outer hole rod is connected to the inner end of a locking insertion tooth, and the outer end of the locking insertion tooth meshes with the locking tooth ring; The diameter of the locking rod is smaller than the diameter of the outer hole rod. The tail end of the sleeve rod spring is fixedly connected to the hole wall of the locking rod hole, and the head end of the sleeve rod spring is connected to the inner end of the outer hole rod.

[0016] The periphery of the top surface of the inner disk is circumferentially connected with an outer ring surface, and the outer ring surface covers the locking tooth ring and the connecting ring above.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the bottom support device suitable for multiple terrains for a load node seismograph of the present invention, it mainly includes a chassis, a level, and three cantilevers. The three cantilevers are arranged separately from each other. Among them, a partial area of the top surface of the chassis is in contact with the bottom surface of the level. A through installation hole is provided in the middle of the chassis. The side part of the chassis is connected to the top end of the cantilever. The bottom end of the cantilever extends obliquely downward until it is connected to the inner end of a horizontal cone foot. A through fixing threaded hole is provided in the middle of the horizontal cone foot, and a fixing screw rod that is in threaded cooperation with it is correspondingly inserted into the fixing threaded hole. During application, the three separately arranged cantilevers can increase the distance between adjacent horizontal cone feet, which is beneficial to enhancing the firmness of the entire support device. At the same time, the threaded connection and cooperation between the horizontal cone foot and the fixing screw rod enable the fixing screw rod to be directly connected to the ground to be detected. As long as the fixing screw rod can be inserted into the ground, the fixed connection between the horizontal cone foot and the ground can be achieved, without being limited to a site with uniform soil quality. Even a soil layer containing a large amount of cobbles and gravel, bedrock, or an artificially hardened site can achieve fixation, greatly reducing the application limitations. In addition, the threaded connection and cooperation between the horizontal cone foot and the fixing screw rod can also enable the horizontal cone foot to have a large vertical height adjustment space to ensure the level of the chassis on a terrain with a large slope, thereby ensuring the level of the node seismograph connected to the chassis, which is beneficial to ensuring the detection effect. Therefore, the present invention not only has strong support firmness and can ensure the detection effect, but also has weak restrictions and a wide application range.

[0018] 2. In the bottom support device applicable to multiple terrains for a load node seismograph according to the present invention, a through mounting hole is provided in the middle of the chassis. During application, this mounting hole is used to connect the node seismograph and the chassis. Preferably, the mounting hole includes a cylindrical hole located in the center of the chassis and at least two waist-shaped holes arranged around the cylindrical hole, so as to match the installation of more models of node seismographs. For example: First, connect and tighten a suitable screw rod with the bottom screw hole of the node seismograph, then insert the lower part of the screw rod into the cylindrical hole, and then lock the lower end of the screw rod with a lock nut to fixedly connect the node seismograph and the chassis; or, when there is more than one bottom screw hole of the node seismograph and it is not located in the center, the node seismograph can be fixed through the waist-shaped holes; or, the bottom of the node seismograph can be fixed together through the cylindrical hole and the waist-shaped holes, so as to adapt to more types of node seismographs. Therefore, there are many connection and fixing methods between the present invention and the seismograph, and it can be applicable to various types of node seismographs.

[0019] 3. In the bottom support device applicable to multiple terrains for a load node seismograph according to the present invention, preferably, the chassis includes an inner disk arranged coaxially and an outer disk connected to its outside (preferably, both the inner disk and the outer disk are demagnetized). Among them, the outer circumference of the inner disk is rotationally matched with the inner side of the outer disk through a connecting bearing, and the outer side of the outer disk is connected to the top end of the cantilever; a through mounting hole is provided in the middle of the inner disk, and a partial area of the top surface of the outer disk is in contact with the bottom surface of the level. During application, the inner disk rotates relative to the outer disk through the connecting bearing. After the outer disk is fixed to the ground to be measured through the cantilever and the fixing screw rod, then through relative rotation, the node seismograph connected to the inner disk rotates together and makes a 360° rotation on the horizontal plane, so as to complete the north-pointing orientation of the instrument, without the need to adjust the cantilever and the fixing screw rod again, which is very efficient. Therefore, the present invention can be compatible with horizontal support and the north-pointing orientation of the instrument, and the efficiency of instrument erection is relatively high.

[0020] 4. In the bottom support device applicable to multiple terrains for the load node seismograph of the present invention, preferably, a locking tooth ring is circumferentially arranged on the part of the outer circumference of the inner disc that is higher than the inner bead groove. A through locking rod hole is formed in the part of the inner circumference of the outer disc that is higher than the outer bead groove. A coaxial sleeve rod spring is arranged in the locking rod hole. A coaxial locking rod is arranged inside the sleeve rod spring. One end of the locking rod is connected to a locking rod head located outside the locking rod hole. The other end of the locking rod is connected to the inner end of an outer rod outside the hole. The outer end of the outer rod outside the hole is connected to the inner end of a locking insertion tooth. The outer end of the locking insertion tooth is engaged with the locking tooth ring. The diameter of the locking rod is smaller than that of the outer rod outside the hole. The tail end of the sleeve rod spring is fixedly connected to the hole wall of the locking rod hole. The head end of the sleeve rod spring is connected to the inner end of the outer rod outside the hole. During application, when it is necessary to rotate the inner disc, first pull the locking rod head outwards to drive the locking rod and the sleeve rod spring to be pulled outwards together, so as to release the engagement between the locking insertion tooth and the locking tooth ring. Then rotate the inner disc to a predetermined angle, and then release the locking rod head, so that the locking rod moves inwards under the action of the resilience of the sleeve rod spring, thereby driving the locking insertion tooth to move forward until the locking insertion tooth and the locking tooth ring are engaged again, realizing the locking of the inner disc. This not only facilitates the mutual rotation between the inner disc and the outer disc and conveniently realizes the north orientation of the instrument, but also can be accurately fixed after orientation, and the fixing firmness is relatively high. Therefore, the present invention has a good orientation effect on the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the three-dimensional structural schematic diagram of the present invention.

[0022] Figure 2 is Figure 1 the structural schematic diagram after removing the fixing screw in

[0023] Figure 3 is Figure 1 the structural schematic diagram of the cantilever in

[0024] Figure 4 is the internal structural schematic diagram of the chassis in the present invention.

[0025] Figure 5 is the relative position schematic diagram of the locking rod and the sleeve rod spring in the present invention.

[0026] Figure 6 is the structural schematic diagram of the outer disc in the present invention.

[0027] Figure 7 is the structural schematic diagram of the inner disc in the present invention.

[0028] Figure 8 is the connection structural schematic diagram of the inner disc and the connecting bearing in the present invention.

[0029] Figure 9It is a top view of the spirit level in the present invention.

[0030] In the figure: spirit level 1, chassis 2, cantilever 3, vertical part 31, inclined part 32, inclination angle 33, mounting hole 4, cylindrical hole 41, waist-shaped hole 42, inner disc 5, inner bead groove 51, outer ring surface 52, outer disc 6, outer bead groove 61, connecting bearing 7, connecting ring 71, ball 72, connecting ring rod 73, bead ring sleeve 74, locking rod 8, locking gear ring 81, locking rod hole 82, sleeve rod spring 83, rod outside the hole 84, locking inserted tooth 85, locking rod head 86, horizontal cone foot 9, fixed threaded hole 91, fixed screw 92, rod head 93, rod body 94, upper polished rod 941, middle threaded rod 942, lower polished rod 943, rod tip 95, fixing nut 10. Detailed implementation mode

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0032] See Figure 1 — Figure 9 , a bottom support device suitable for multiple terrains for a load node seismograph, the bottom support device includes a chassis 2, a spirit level 1 and three cantilevers 3; A partial area on the top surface of the chassis 2 is in contact with the bottom surface of the spirit level 1, and a through mounting hole 4 is provided in the middle of the chassis 2; The side part of the chassis 2 is connected to the top end of the cantilever 3, the bottom end of the cantilever 3 extends obliquely downward until it is connected to the inner end of the horizontal cone foot 9, a through fixed threaded hole 91 is provided in the middle of the horizontal cone foot 9, and a fixed screw 92 that is threadedly engaged with it is correspondingly inserted into the fixed threaded hole 91, and the three cantilevers 3 are arranged separately from each other.

[0033] The cantilever 3 includes a vertical part 31 and an inclined part 32, the inner side surface of the vertical part 31 is connected to the side part of the chassis 2, the bottom end of the vertical part 31 is connected to the top end of the inclined part 32, and the bottom end of the inclined part 32 is connected to the inner end of the horizontal cone foot 9.

[0034] The inclined part 32 forms an inclination angle 33 with the gravity line, and the size of the inclination angle 33 is from twenty degrees to sixty degrees.

[0035] The fixed screw 92 includes a rod head 93, a rod body 94 and a rod tip 95 that are connected in sequence from top to bottom, and an external thread is provided on the side circumference of the rod body 94.

[0036] The rod body 94 includes an upper polished rod 941, a middle threaded rod 942 and a lower polished rod 943. External threads are provided on the side circumference of the middle threaded rod 942, and there are no threads on the upper polished rod 941 and the lower polished rod 943. Moreover, the rod head 93, the upper polished rod 941, the middle threaded rod 942, the lower polished rod 943, and the rod tip 95 are connected in sequence from top to bottom.

[0037] The chassis 2 includes an inner disk 5 arranged coaxially and an outer disk 6 annularly connected to its outside; the outer circumference of the inner disk 5 is rotationally mated with the inner side surface of the outer disk 6 through a connecting bearing 7, and the outer side surface of the outer disk 6 is connected to the top end of the cantilever 3; A through mounting hole 4 is provided in the middle of the inner disk 5, and a partial area on the top surface of the outer disk 6 is in contact with the bottom surface of the level 1.

[0038] The mounting hole 4 includes a cylindrical hole 41 and at least two waist-shaped holes 42. The cylindrical hole 41 is located at the center of the inner disk 5, and the waist-shaped holes 42 are arranged around the cylindrical hole 41.

[0039] An inwardly concave inner bead groove 51 is provided on the outer circumference of the inner disk 5, and an inwardly concave outer bead groove 61 is provided on the inner side surface of the outer disk 6. The connecting bearing 7 includes a connecting ring 71 and a plurality of balls 72. The connecting ring 71 includes a plurality of connecting rod segments 73 and bead rings 74 connected at intervals in sequence. Each bead ring 74 is sleeved with a ball 72; The middle part of the ball 72 is located within the corresponding bead ring 74. The inner end of the ball 72 is in sliding fit along the inner bead groove 51 where it is located, and the outer end of the ball 72 is in sliding fit along the outer bead groove 61 where it is located.

[0040] A locking tooth ring 81 is annularly arranged on the outer circumference of the inner disk 5 at a position higher than the inner bead groove 51. A through locking rod hole 82 is provided on the inner circumference of the outer disk 6 at a position higher than the outer bead groove 61. A coaxial sleeve rod spring 83 is arranged in the locking rod hole 82. A coaxial locking rod 8 is arranged inside the sleeve rod spring 83. One end of the locking rod 8 is connected to a locking rod head 86 located outside the locking rod hole 82. The other end of the locking rod 8 is connected to the inner end of an outer hole rod 84. The outer end of the outer hole rod 84 is connected to the inner end of a locking insert tooth 85. The outer end of the locking insert tooth 85 is engaged with the locking tooth ring 81; The diameter of the locking rod 8 is smaller than the diameter of the outer hole rod 84. The tail end of the sleeve rod spring 83 is fixedly connected to the hole wall of the locking rod hole 82, and the head end of the sleeve rod spring 83 is connected to the inner end of the outer hole rod 84.

[0041] An outer ring surface 52 is annularly connected around the top surface of the inner disk 5, and the outer ring surface 52 covers the locking tooth ring 81 and the connecting ring 71.

[0042] The supplementary technical features of the present invention are as follows: The cantilever 3 in the present invention is preferably made of a metal with high mechanical strength, such as stainless steel.

[0043] In the present invention, the size of the inclination angle 33 is from twenty degrees to sixty degrees, preferably thirty degrees.

[0044] The spirit level 1 in the present invention is preferably a circular spirit level, and its structural schematic diagram is as Figure 9 shown.

[0045] Example 1: Refer to Figure 1 — Figure 9 , a bottom support device applicable to multiple terrains for a load node seismograph, the bottom support device includes a chassis 2, a spirit level 1 and three cantilevers 3; a partial area on the top surface of the chassis 2 is in contact with the bottom surface of the spirit level 1, and a through mounting hole 4 is provided in the middle of the chassis 2; the side part of the chassis 2 is connected to the top end of the cantilever 3, and the bottom end of the cantilever 3 extends obliquely downward until it is connected to the inner end of the horizontal cone foot 9. A through fixing threaded hole 91 is provided in the middle of the horizontal cone foot 9, and a fixing screw 92 that is in threaded fit with it is correspondingly inserted into the fixing threaded hole 91, and the three cantilevers 3 are separated from each other. The cantilever 3 includes a vertical part 31 and an inclined part 32. The inner side surface of the vertical part 31 is connected to the side part of the chassis 2, the bottom end of the vertical part 31 is connected to the top end of the inclined part 32, and the bottom end of the inclined part 32 is connected to the inner end of the horizontal cone foot 9.

[0046] During application, first predetermine the installation positions of the three horizontal cone feet 9. The horizontal cone feet 9 are in a horizontal state during installation. Then, pass the fixing screw 92 through the fixing threaded hole 91 in the corresponding horizontal cone foot 9 and connect it to the ground at the installation position. The connection relationship between the fixing screw 92 and the ground depends on the depth of insertion of the fixing screw 92 into the ground. Therefore, regardless of the ground, even in a soil layer containing a large amount of cobbles and boulders, bedrock or artificial hardened sites, it can be inserted and fixed. In addition, the installation height of the horizontal cone foot 9 is mainly determined by the relative thread rotation of the fixing screw 92 and the fixing threaded hole 91. When the preset height is reached, stop the thread rotation, and fix the height through the threaded connection between the fixing screw 92 and the fixing threaded hole 91 (it is also possible to reverse the fixing nut 10 located below the horizontal cone foot 9 after stopping the thread rotation to enhance the connection firmness between the fixing screw 92 and the horizontal cone foot 9), so as to adapt to a terrain with a large slope and ensure the levelness of the chassis 2, thereby ensuring the levelness of the node seismograph connected to the chassis 2. In addition, the horizontal state of the chassis 2 needs to be judged and confirmed through the spirit level 1.

[0047] Regarding the connection operation between the chassis 2 and the nodal seismograph (realized through the mounting holes 4), it can be carried out either after the three horizontal cone feet 9 are fixedly connected to the ground, or in advance before the fixing operation between the horizontal cone feet 9 and the ground.

[0048] Embodiment 2: The basic content is the same as that of Embodiment 1, the difference lies in: The fixing screw 92 includes a screw head 93, a screw body 94 and a screw tip 95 which are connected in sequence from top to bottom, and external threads are provided on the side circumference of the screw body 94. During application, if the ground is hard, the screw tip 95 is inserted into the ground by knocking the screw head 93.

[0049] Further preferably, the screw body 94 includes an upper polished rod 941, a middle threaded rod 942 and a lower polished rod 943. External threads are provided on the side circumference of the middle threaded rod 942, and there are no threads on the upper polished rod 941 and the lower polished rod 943. The screw head 93, the upper polished rod 941, the middle threaded rod 942, the lower polished rod 943 and the screw tip 95 are connected in sequence from top to bottom. Among them, the design of the lower polished rod 943 is beneficial to the smoother insertion of the screw head 93 into the ground.

[0050] Embodiment 3: The basic content is the same as that of Embodiment 1, the difference lies in: The chassis 2 includes an inner disk 5 arranged coaxially and an outer disk 6 annularly connected outside it; the outer circumference of the inner disk 5 is rotationally matched with the inner side surface of the outer disk 6 through a connecting bearing 7, and the outer side surface of the outer disk 6 is connected to the top end of the cantilever 3; a through mounting hole 4 is opened in the middle of the inner disk 5, and a partial area on the top surface of the outer disk 6 is in contact with the bottom surface of the level 1. An inner concave inner bead groove 51 is opened on the outer circumference of the inner disk 5, and an inner concave outer bead groove 61 is opened on the inner side surface of the outer disk 6. The connecting bearing 7 includes a connecting ring 71 and a plurality of balls 72. The connecting ring 71 includes a plurality of connecting rod rings 73 and bead rings 74 connected at intervals in sequence. Each bead ring 74 is sleeved with a ball 72; the middle part of the ball 72 is located inside the corresponding bead ring 74, the inner end of the ball 72 slides along the inner bead groove 51 where it is located, and the outer end of the ball 72 slides along the outer bead groove 61 where it is located.

[0051] During application, after the outer disk 6 is fixed in a horizontal position by the cantilever 3, the inner disk 5 is also in a horizontal position. At this time, by simply rotating the inner disk 5, the orientation of the nodal seismograph connected thereto can be changed to achieve a 360-degree rotation to obtain the required detection angle, such as the north orientation of the instrument.

[0052] Embodiment 4: The basic content is the same as that of Embodiment 3, the difference lies in: A locking tooth ring 81 is disposed around the outer circumference of the inner disk 5 at a position higher than the inner bead groove 51. A through locking rod hole 82 is formed in the inner circumference of the outer disk 6 at a position higher than the outer bead groove 61. A coaxial sleeve rod spring 83 is disposed in the locking rod hole 82. A coaxial locking rod 8 is disposed inside the sleeve rod spring 83. One end of the locking rod 8 is connected to a locking rod head 86 located outside the locking rod hole 82. The other end of the locking rod 8 is connected to the inner end of an outer rod 84 outside the hole. The outer end of the outer rod 84 is connected to the inner end of a locking insertion tooth 85. The outer end of the locking insertion tooth 85 meshes with the locking tooth ring 81. The diameter of the locking rod 8 is smaller than the diameter of the outer rod 84. The tail end of the sleeve rod spring 83 is fixedly connected to the hole wall of the locking rod hole 82. The head end of the sleeve rod spring 83 is connected to the inner end of the outer rod 84.

[0053] During application, when it is necessary to change the orientation of the nodal seismograph connected to the inner disk 5, first pull the locking rod head 86 outwards to pull out the sleeve rod spring 83 and the locking rod 8 outwards, thereby pulling out the outer rod 84 and the locking insertion tooth 85 outwards, and then releasing the engagement between the locking insertion tooth 85 and the locking tooth ring 81. Then rotate the inner disk 5 so that the inner disk 5 and the outer disk 6 rotate relative to each other through the connecting bearing 7, driving the nodal seismograph connected to the inner disk 5 to rotate together until it reaches the required orientation of the nodal seismograph. Then release the locking rod head 86. Under the action of the resilience of the sleeve rod spring 83, drive the locking rod 8 to reset, drive the outer rod 84 and the locking insertion tooth 85 to reset, thereby realizing the engagement between the locking insertion tooth 85 and the locking tooth ring 81, and then fixing the inner disk 5, that is, fixing the required orientation of the nodal seismograph.

[0054] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modification or change made by those of ordinary skill in the art according to the disclosure of the present invention shall be included in the protection scope recorded in the claims.

Claims

1. A bottom support device applicable to multi-terrain for a load node seismograph, characterized in that: The bottom support device includes a chassis (2), a spirit level (1) and three cantilevers (3); A partial area of the top surface of the chassis (2) is in contact with the bottom surface of the spirit level (1), and a through mounting hole (4) is provided in the middle of the chassis (2); The side of the chassis (2) is connected to the top end of the cantilever (3). The bottom end of the cantilever (3) extends obliquely downward until it is connected to the inner end of the horizontal cone foot (9). A through fixing threaded hole (91) is provided in the middle of the horizontal cone foot (9), and a fixing screw rod (92) that is in threaded cooperation with it is correspondingly inserted into the fixing threaded hole (91), and the three cantilevers (3) are arranged separately from each other.

2. The bottom support device of a node seismograph applicable to multiple terrains according to claim 1, wherein: The cantilever (3) includes a vertical part (31) and an inclined part (32). The inner side surface of the vertical part (31) is connected to the side of the chassis (2). The bottom end of the vertical part (31) is connected to the top end of the inclined part (32), and the bottom end of the inclined part (32) is connected to the inner end of the horizontal cone foot (9).

3. The bottom support device of a node seismograph applicable to multiple terrains according to claim 2, characterized in that: The inclined part (32) forms an inclined angle (33) with the gravity line, and the size of the inclined angle (33) is from twenty degrees to sixty degrees.

4. The bottom support device of a node seismograph applicable to multiple terrains according to claim 1, 2 or 3, characterized in that: The fixing screw rod (92) includes a rod head (93), a rod body (94) and a rod tip (95) connected in sequence from top to bottom. External threads are provided on the side circumference of the rod body (94).

5. The bottom support device of a node seismograph applicable to multiple terrains according to claim 4, characterized in that: The rod body (94) includes an upper polished rod (941), a middle threaded rod (942) and a lower polished rod (943). External threads are provided on the side circumference of the middle threaded rod (942). There are no threads on the upper polished rod (941) and the lower polished rod (943), and the rod head (93), the upper polished rod (941), the middle threaded rod (942), the lower polished rod (943), and the rod tip (95) are connected in sequence from top to bottom.

6. The bottom support device of a node seismograph applicable to multiple terrains according to claim 1, 2 or 3, characterized in that: The chassis (2) includes an inner disk (5) arranged coaxially and an outer disk (6) circumferentially connected to its outside; the outer circumference of the inner disk (5) is rotationally matched with the inner side surface of the outer disk (6) through a connecting bearing (7), and the outer side surface of the outer disk (6) is connected to the top end of the cantilever (3); A through mounting hole (4) is provided in the middle of the inner disk (5), and a partial area of the top surface of the outer disk (6) is in contact with the bottom surface of the spirit level (1).

7. The bottom support device of a node seismograph applicable to multiple terrains according to claim 6, characterized in that: The mounting hole (4) includes a cylindrical hole (41) and at least two waist-shaped holes (42). The cylindrical hole (41) is located in the middle of the inner disk (5), and the waist-shaped holes (42) are arranged around the cylindrical hole (41).

8. The bottom support device of a node seismograph applicable to multiple terrains according to claim 6, characterized in that: An inner concave inner bead groove (51) is provided on the outer circumference of the inner disk (5), and an inner concave outer bead groove (61) is provided on the inner side surface of the outer disk (6). The connecting bearing (7) includes a connecting ring (71) and a plurality of balls (72). The connecting ring (71) includes a plurality of connecting ring rods (73) and bead sleeves (74) connected at intervals in sequence. A ball (72) is sleeved in each bead sleeve (74); The middle of the ball (72) is located in the corresponding bead sleeve (74). The inner end of the ball (72) is in sliding fit along the inner bead groove (51) where it is located, and the outer end of the ball (72) is in sliding fit along the outer bead groove (61) where it is located.

9. The bottom support device of a node seismograph applicable to multiple terrains according to claim 8, characterized in that: A locking tooth ring (81) is circumferentially arranged on the outer circumference of the inner disk (5) at a position higher than the inner bead groove (51). A through locking rod hole (82) is formed in the inner circumference of the outer disk (6) at a position higher than the outer bead groove (61). A coaxial sleeve rod spring (83) is arranged in the locking rod hole (82). A coaxial locking rod (8) is arranged inside the sleeve rod spring (83). One end of the locking rod (8) is connected to a locking rod head (86) located outside the locking rod hole (82). The other end of the locking rod (8) is connected to the inner end of an outer rod outside the hole (84). The outer end of the outer rod outside the hole (84) is connected to the inner end of a locking insertion tooth (85). The outer end of the locking insertion tooth (85) meshes with the locking tooth ring (81). The diameter of the locking rod (8) is smaller than the diameter of the outer rod outside the hole (84). The tail end of the sleeve rod spring (83) is fixedly connected to the hole wall of the locking rod hole (82). The head end of the sleeve rod spring (83) is connected to the inner end of the outer rod outside the hole (84).

10. The bottom support device of a node seismograph applicable to multiple terrains according to claim 9, characterized in that: An outer ring surface (52) is circumferentially connected around the top surface of the inner disk (5). The outer ring surface (52) covers the locking tooth ring (81) and the connecting ring (71).

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