Series tensioning type falling mechanism and gravimeter

Abstract

The utility model discloses a series-connection tensioning type falling mechanism and a gravimeter. The series-connection tensioning type falling mechanism comprises a falling bin, a series-connection rotating mechanism, a tensioning adjusting mechanism, two balance parts and a driving device. The falling prism is located in the falling bin. The serial rotating mechanism is in transmission connection with the two ends of the falling bin in the first direction; the tensioning adjusting mechanism is arranged at one connecting end of the falling bin and the serial rotating mechanism, and the tensioning adjusting mechanism is used for adjusting the tensioning force between the falling bin and the serial rotating mechanism; the two balance parts are in transmission connection with the series-connection rotating mechanism, symmetrically arranged on the two sides of the central axis of the falling bin and used for keeping the whole mass center of the series-connection tensioning type falling mechanism unchanged when the falling bin moves in the first direction; the driving device is connected with the serial rotation mechanism and used for driving the serial rotation mechanism to drive the falling bin to move in the first direction so as to achieve free falling motion of the falling prism in the falling bin.

Description

Technical Field

[0001] This application relates to the field of gravimeter technology, and more specifically, to a series tensioned falling mechanism and a gravimeter. Background Technology

[0002] Mechanical gravimeters calculate the acceleration g value at the measurement point by simulating free fall motion in a vacuum environment. The core of the vacuum fall system is the fall mechanism inside.

[0003] Currently, mechanical absolute gravimeters mainly employ two types of vacuum descent system designs, with corresponding two mainstream descent mechanisms: one without a drag-free vacuum chamber, and the other with a drag-free vacuum chamber. The drag-free vacuum chamber is currently the mainstream structure. In this system, flexible materials such as steel belts independently pass over fixed rollers at both ends and are connected in parallel to the upper and lower surfaces of the descent chamber. However, because the drag-free vacuum chamber descent system uses independently pre-tensioned parallel steel belts / ropes, sensors or tension gauges are needed for adjustment to ensure similar pre-tension forces. However, these methods, like tightening a seesaw, alternately tighten both sides, leading to asymmetrical deformation and only ensuring short-term effectiveness. As the stress in the descent system is slowly released, this asymmetrical deformation worsens after a period of use, making it impossible to guarantee the system's shape and position. Consequently, the descent system cannot reach its ideal state. Deformation of the descent track directly causes the descent chamber to fall outside the laser wave vector direction determined by the alcohol surface, ultimately resulting in problems such as the falling object's rotation and system vibration. The interference fringes cannot accurately reflect the displacement of the falling object. Furthermore, existing technologies typically use sensors to detect and adjust the pretension of the steel belts / ropes individually until they are close. However, adjusting them individually or alternately creates a seesaw effect, preventing simultaneous and equal pretensioning. Therefore, although the tension of the parallel steel belts / ropes appears the same on the surface, the descent system is already deformed, ultimately compromising its shape and position tolerances. Utility Model Content

[0004] This application provides a series tensioning type falling mechanism and a gravimeter, which solves the deformation problem caused by the inability to dynamically and synchronously pre-tighten the two sections of the transmission belt or transmission rope during the assembly and debugging stage of the existing drag-type vacuum chamber falling system.

[0005] The specific technical solution is as follows:

[0006] In a first aspect, embodiments of this application provide a series tensioned lowering mechanism, comprising:

[0007] A drop chamber, with the drop prism located inside the drop chamber;

[0008] A series rotating mechanism is connected to both ends of the drop chamber along the first direction for transmission;

[0009] The tension adjustment mechanism is located at one of the connection ends between the drop chamber and the series rotating mechanism, and is used to adjust the tension force between the drop chamber and the series rotating mechanism.

[0010] Two balancing components are respectively connected to the series rotating mechanism, and the two balancing components are symmetrically arranged on both sides of the central axis of the drop chamber, so as to keep the overall center of mass of the series tension drop mechanism unchanged when the drop chamber moves along the first direction.

[0011] A driving device is connected to the series rotating mechanism and is used to drive the series rotating mechanism to move the drop chamber along the first direction so as to realize the free fall motion of the drop prism in the drop chamber.

[0012] The first direction is the direction perpendicular to the horizontal ground.

[0013] In some embodiments of this application, the series rotation mechanism includes a first fixed base, a second fixed base, a first fixed pulley, a second fixed pulley, a third fixed pulley, a fourth fixed pulley, four mounting brackets, a transmission belt, and a connecting structure. The first fixed base and the second fixed base are fixedly connected by the connecting structure. The first fixed pulley and the second fixed pulley are each fixedly mounted on the first fixed base by one of the mounting brackets. The third fixed pulley and the fourth fixed pulley are each fixedly mounted on the second fixed base by one of the mounting brackets. The first fixed pulley, the second fixed pulley, the third fixed pulley, and the fourth fixed pulley are connected in series by the transmission belt. One end of the transmission belt is connected to one end of the falling chamber along the first direction through the tension adjustment mechanism, and the other end of the transmission belt is connected to the other end of the falling chamber along the first direction.

[0014] In some embodiments of this application, both the first fixed base and the second fixed base are plate structures. The first fixed pulley and the second fixed pulley are respectively fixedly mounted on the first end face of the first fixed base near the second fixed base by a mounting bracket. The third fixed pulley and the fourth fixed pulley are respectively fixedly mounted on the first end face of the second fixed base away from the first fixed base by a mounting bracket. The central axes of the first fixed pulley, the second fixed pulley, the third fixed pulley, and the fourth fixed pulley all extend along a second direction. The second fixed base is provided with three through holes, which are arranged sequentially along a third direction. The middle through hole is located between the two mounting brackets on the second fixed base, and the two through holes at both ends are located on both sides of the two mounting brackets on the second fixed base along the third direction. The transmission belts on the third fixed pulley and the fourth fixed pulley pass through the three through holes and pass through the second fixed base, connecting to the lowering chamber or sleeved on the first fixed pulley and the second fixed pulley.

[0015] Wherein, the third direction, the second direction, and the first direction are all perpendicular to each other.

[0016] In some embodiments of this application, the connection structure includes two first connecting rods and four second connecting rods. The first fixing base has two first fixing holes and four second fixing holes, both located at the edge of the first fixing base. The two first fixing holes are located on both sides of the two mounting brackets on the first fixing base along the second direction, and the four second fixing holes are symmetrically located on both sides of the two mounting brackets on the first fixing base along the third direction. The center line connecting the two second fixing holes on each side extends along the second direction. The second fixing base has two third fixing holes and four fourth fixing holes, both located at the edge of the second fixing base. The two third fixing holes are located on both sides of the two mounting brackets on the second fixing base along the second direction, and the four fourth fixing holes are symmetrically located on both sides of the two mounting brackets on the second fixing base along the third direction. Furthermore, the center line connecting the two fourth fixing holes on each side extends along the second direction. The central axes of the two first fixing holes and the central axes of the two third fixing holes are respectively aligned and coincidentally set along the first direction. The central axes of the four second fixing holes and the central axes of the four fourth fixing holes are respectively aligned and coincidentally set along the first direction. Each of the two first fixing holes, the four second fixing holes, the two third fixing holes, and the four fourth fixing holes is provided with a slit opening. One end of each of the two first connecting rods is respectively set in the two first fixing holes, and the other end of each of the two first connecting rods is respectively set in the two third fixing holes. One end of each of the four second connecting rods is respectively set in the four second fixing holes, and the other end of each of the four second connecting rods is respectively set in the four fourth fixing holes. Each slit opening is clamped and fixed by at least one fastening bolt, so that the two first connecting rods and the four second connecting rods are fixed on the first fixing base and the second fixing base.

[0017] In some embodiments of this application, the drop chamber includes a chamber body, a first chamber end cap, a second chamber end cap, and two first bearing mounting seats. The first chamber end cap and the second chamber end cap are respectively fixedly connected to both ends of the chamber body along the first direction, forming a relatively closed cavity structure. The drop prism is fixedly disposed in the cavity structure. The two first bearing mounting seats are respectively disposed on the outer side wall of the chamber body, and the two first bearing mounting seats are located at both ends of the chamber body along the second direction. Each first bearing mounting seat is slidably mounted on a first connecting rod through a first sliding bearing.

[0018] In some embodiments of this application, a limiting block is provided on each of the two first connecting rods. Both limiting blocks are located close to the first fixed base and are on the same horizontal plane in the first direction. The limiting blocks are cylindrical and their diameters match the diameters of the first sliding bearings.

[0019] In some embodiments of this application, each balancing component includes a balancing block body, two second bearing mounting seats, two second sliding bearings, and two clamping blocks. The two second bearing mounting seats are disposed at both ends of the balancing block body along the second direction. Each second bearing mounting seat contains one second sliding bearing. The balancing component is slidably mounted on two second connecting rods on one side along the third direction via the two second sliding bearings. The two clamping blocks are disposed at the middle of both ends of the balancing block body along the first direction. The balancing component and the transmission belt are fixedly connected via the two clamping blocks.

[0020] In some embodiments of this application, each of the balancing components further includes a first fixing block, a second fixing block, a tension adjusting screw, a tension adjusting nut, and two positioning blocks. The balancing block body has an adjusting groove at the center of its first end face along the first direction, and an adjusting opening at each end of the adjusting groove along the third direction. A connecting hole is provided within the adjusting groove, extending from the adjusting groove to the center of the second end face of the balancing block body along the first direction. The first fixing block is fixedly installed to the center of the first end face of the balancing block body by a first fixing bolt, and the central axis of the adjusting groove coincides with the central axis of the first fixing block. The balancing block body has a first positioning groove on each of its two side walls along the third direction, with the first positioning groove positioned close to the second end face of the balancing block body. The second fixing block is positioned along the third direction... Each of the two side walls of the balance block has a second positioning groove, and the two second positioning grooves correspond one-to-one with the two first positioning grooves. Each positioning block is positioned in the corresponding first positioning groove and second positioning groove, and the two ends of each positioning block are fixedly connected to the balance block body and the second fixing block respectively by second fixing bolts. The large diameter end of the tension adjusting nut is abutted in the adjusting groove, and the small diameter end of the tension adjusting nut is inserted in the communicating hole. The tension adjusting screw passes through the second fixing block to the communicating hole and is threadedly connected to the small diameter end of the tension adjusting nut. Two clamping blocks are respectively set on the first fixing block and the tension adjusting screw. By adjusting the threaded connection length between the tension adjusting screw and the tension adjusting nut, the tension between the balance component and the transmission belt can be adjusted.

[0021] In some embodiments of this application, the tension adjustment mechanism includes a sliding block, an adjusting tension block, a sliding structure, and two adjusting tension screws. A receiving groove is provided at the middle of one of the connecting ends of the lower chamber and the series rotating mechanism. The receiving groove extends along the first direction from the end face of the lower chamber toward a direction away from the lower chamber. The sliding block is a cavity structure with one closed end, and a through hole is provided at the closed end of the sliding block. The shape and size of the cross-section of the sliding block perpendicular to the first direction match the shape and size of the inner cavity of the receiving groove perpendicular to the first direction. The sliding structure is disposed within the cavity structure, and the centerline axis of the sliding structure is perpendicular to the first direction. The vertical cross-section of the adjusting tension block along the first direction is T-shaped, and a through groove extending along the first direction is provided on the adjusting tension block. The small-diameter end of the adjusting tension block is perpendicular to the first direction. The shape and size of the cross-section of the adjusting tension block are the same as the shape and size of the cross-section of the sliding block perpendicular to the first direction. The shape and size of the cross-section of the large-diameter end of the adjusting tension block perpendicular to the first direction matches the outer periphery shape and size of the cross-section of the receiving groove perpendicular to the first direction. The sliding block is disposed in the receiving groove, and the closed end of the sliding block is located on the side of the receiving groove away from the falling chamber. The small-diameter end of the adjusting tension block is inserted into the receiving groove, and the large-diameter end of the adjusting tension block is fixedly connected to the end face of the receiving groove by two adjusting tension screws. The transmission belt passes through the through slot and the through hole in sequence into the cavity structure and is sleeved on the sliding structure. The tension adjustment mechanism adjusts the distance between the large-diameter end of the adjusting tension block and the end face of the receiving groove by two adjusting tension screws to realize the tension adjustment between the falling chamber and the series rotation mechanism.

[0022] Secondly, embodiments of this application provide a gravimeter, including: the series tensioned falling mechanism described in the first aspect.

[0023] The beneficial effects of the embodiments of this application are as follows:

[0024] The series tensioning descent mechanism adopts a series tensioning structure, which can realize synchronous equal force pre-tensioning of the structures on both sides of the descent chamber and apply force symmetrically and equally, effectively avoiding excessive twisting, lateral displacement and other deformations of the structures on both sides of the descent chamber, and improving the measurement accuracy of the gravimeter. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a series tensioning falling mechanism provided in Embodiment 1 of this application;

[0027] Figure 2 A schematic diagram of a series tensioning falling mechanism provided in Embodiment 2 of this application;

[0028] Figure 3 This is a schematic diagram of a series tensioning falling mechanism provided in Embodiment 1 of this application;

[0029] Figure 4 A cross-sectional schematic diagram of a series tensioning falling mechanism provided in Embodiment 1 of this application;

[0030] Figure 5 This is a structural schematic diagram of the tension adjustment mechanism in a series tensioning type drop mechanism provided in Embodiment 1 of this application;

[0031] Figure 6 This is a schematic diagram of the structure of the balancing component in a series tensioning dropping mechanism provided in Embodiment 1 of this application;

[0032] Figure 7 A cross-sectional schematic diagram of the balancing component in a series tensioning drop mechanism provided in Embodiment 1 of this application;

[0033] Figure 8 This is a schematic diagram of the structure of the balance block body and two second bearing mounting seats in a series tensioning falling mechanism provided in Embodiment 1 of this application;

[0034] Explanation of reference numerals in the attached drawings: 1 is the drop chamber; 11 is the chamber body; 111 is the observation port; 12 is the first chamber end cap; 13 is the second chamber end cap; 131 is the light transmission hole; 14 is the first bearing mounting base; 15 is the cavity structure; 16 is the first sliding bearing; 17 is the receiving groove; 2 is the series rotation mechanism; 21 is the first fixed base; 211 is the first end face of the first fixed base 21; 212 is the first fixing hole; 213 is the second fixing hole. 22 is the second fixed base, 221 is the first end face of the second fixed base 22, 222 is a through hole, 223 is the third fixed hole, 224 is the fourth fixed hole, 23 is the first fixed pulley, 24 is the second fixed pulley, 25 is the third fixed pulley, 26 is the fourth fixed pulley, 27 is the mounting bracket, 28 is the transmission belt, 29 is the connecting structure, 291 is the first connecting rod, 292 is the second connecting rod, 293 is the limiting block, and 201 is the gap opening. 202 is a fastening bolt, 203 is a circular ring bracket, 204 is a connecting bracket, 205 is a connecting pin, 206 is a drive shaft, 3 is a tension adjustment mechanism, 31 is a sliding block, 311 is a cavity structure, 312 is a through hole, 32 is an adjusting tension block, 321 is a through slot, 33 is a sliding structure, 34 is an adjusting tension screw, 4 is a balancing component, 41 is the main body of the balancing block, 411 is an adjusting groove, 412 is an adjusting opening, 413 is... The following structures are defined: a connecting hole, 414 is the first end face of the balance block body 41, 415 is the second end face of the balance block body 41, 416 is the first positioning groove, 42 is the second bearing mounting seat, 43 is the second sliding bearing, 44 is the clamping block, 45 is the first fixing block, 46 is the second fixing block, 47 is the tension adjustment screw, 48 is the tension adjustment nut, 49 is the positioning block, 401 is the first fixing bolt, 402 is the second fixing bolt, and 5 is the falling prism. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0037] This application discloses a series tensioned dropping mechanism. Detailed descriptions follow.

[0038] Example 1

[0039] Figure 1 A series tensioned drop mechanism according to Embodiment 1 of this application is shown. Figure 1 As shown, the series-tensioned falling mechanism mainly includes: a falling chamber 1, a series-rotating mechanism 2, a tension adjustment mechanism 3, two balancing members 4, and a drive device (not shown in the figure). Specifically, the falling prism 5 is located inside the falling chamber 1. The series-rotating mechanism 2 is connected to both ends of the falling chamber 1 along the first direction. The tension adjustment mechanism 3 is located at one of the connection ends between the falling chamber 1 and the series-rotating mechanism 2, and is used to adjust the tension between the falling chamber 1 and the series-rotating mechanism 2. The two balancing members 4 are respectively connected to the series-rotating mechanism 2, and are symmetrically arranged on both sides of the central axis of the falling chamber 1, so as to keep the overall center of mass of the series-tensioned falling mechanism unchanged when the falling chamber 1 moves along the first direction. The drive device is connected to the series-rotating mechanism 2 and is used to drive the series-rotating mechanism 2 to move the falling chamber 1 along the first direction, so as to realize the free fall motion of the falling prism 5 inside the falling chamber 1.

[0040] In this application, the first direction is perpendicular to the horizontal ground, and the first, second, and third directions are mutually perpendicular. It should be noted that the perpendicularity in this application is not absolute and can be 90° ± 10°.

[0041] In Embodiment 1 of this application, as Figure 3 and Figure 4As shown, the drop chamber 1 is the main component of this series-tensioned drop mechanism. It is used to carry the drop prism 5, and serves to receive it when it finishes its descent, and to slowly lift it back to the starting point for the next descent. In specific implementation, the drop chamber 1 mainly includes a chamber body 11, a first chamber end cap 12, and a second chamber end cap 13. The first and second chamber end caps 12 and 13 are respectively fixedly connected to the two ends of the chamber body 11 along a first direction, forming a relatively closed cavity structure 15. The drop prism 5 is fixedly installed inside the cavity structure 15. Furthermore, the first chamber end cap 12 is located at the end of the chamber body 11 away from the ground, and the second chamber end cap 13 is located at the end of the chamber body 11 closer to the ground. The first and second chamber end caps 12 and 13 are respectively fixedly connected to the two ends of the chamber body 11 by multiple bolts. Two light-transmitting holes 131 are symmetrically arranged on the end cover 13 of the second chamber to allow laser light to enter and exit the cavity structure 15 through the two light-transmitting holes 131, so as to accurately measure the position of the falling prism 5 during free fall. Then, the gravimeter calculates the gravitational acceleration of the falling prism 5 based on the measured motion trajectory. In addition, an observation port 111 can also be provided on the main body 11 of the chamber to facilitate understanding of the internal situation of the falling chamber 1.

[0042] The series tensioning falling mechanism adopts a series-connected power transmission mechanism, namely the series rotation mechanism 2, which is one of the main innovations of this application. Compared with the parallel-connected falling mechanism in the prior art, it can achieve dynamic synchronous equal force pre-tightening adjustment during the assembly and debugging stage of the drag-type vacuum chamber falling system, and solves the problem of asymmetrical deformation caused by the seesaw problem due to the adjustment one by one or in turn in the prior art.

[0043] In Embodiment 1 of this application, as Figure 3 and Figure 4As shown, the series rotation mechanism 2 includes a first fixed base 21, a second fixed base 22, a first fixed pulley 23, a second fixed pulley 24, a third fixed pulley 25, a fourth fixed pulley 26, four mounting brackets 27, a transmission belt 28, and a connecting structure 29. The first fixed base 21 and the second fixed base 22 are used for the fixed installation of the first fixed pulley 23, the second fixed pulley 24, the third fixed pulley 25, and the fourth fixed pulley 26, respectively. Specifically, the first fixed pulley 23 and the second fixed pulley 24 are each fixedly mounted on the first fixed base 21 via a mounting bracket 27, and the third fixed pulley 25 and the fourth fixed pulley 26 are each fixedly mounted on the second fixed base 22 via a mounting bracket 27. The first fixed base 21 and the second fixed base 22 are fixedly connected by the connecting structure 29 to provide movement space for the lowering chamber 1 to move in the first direction. The first fixed pulley 23, the second fixed pulley 24, the third fixed pulley 25, and the fourth fixed pulley 26 are connected in series via a transmission belt 28. One end of the transmission belt 28 is connected to one end of the drop chamber 1 along the first direction via a tension adjustment mechanism 3, and the other end of the transmission belt 28 is connected to the other end of the drop chamber 1 along the first direction, thus forming a series-connected power transmission mechanism. More specifically, one end of the transmission belt 28 is connected to the first chamber end cover 12 of the drop chamber 1 via the tension adjustment mechanism 3, and the other end of the transmission belt 28 is connected to the second chamber end cover 13 of the drop chamber 1.

[0044] In the specific implementation process, such as Figure 3 and Figure 4As shown, both the first fixed base 21 and the second fixed base 22 are plate structures. The first fixed base 21 includes a first end face 211 and a second end face (not shown) arranged opposite each other along a first direction. The first end face 211 is positioned away from the ground. The first fixed pulley 23 and the second fixed pulley 24 are respectively fixedly mounted on the first end face 211 of the first fixed base 21 near the second fixed base 22 via a mounting bracket 27. The second fixed base 22 includes a first end face 221 and a second end face (not shown) arranged opposite each other along a first direction. The first end face 221 is positioned away from the ground. The third fixed pulley 25 and the fourth fixed pulley 26 are respectively fixedly mounted on the first end face 221 of the second fixed base 22 away from the first fixed base 21 via a mounting bracket 27. Furthermore, the central axes of the first fixed pulley 23, the second fixed pulley 24, the third fixed pulley 25, and the fourth fixed pulley 26 all extend along a second direction. Furthermore, the second fixed base 22 is provided with three through holes 222, which are arranged sequentially along the third direction. The middle through hole 222 is located between the two mounting brackets 27 on the second fixed base 22, and the two through holes 222 at both ends are located on both sides of the two mounting brackets 27 on the second fixed base 22 along the third direction. That is, the two mounting brackets 27 on the second fixed base 22 are located between each pair of the three through holes 222. The transmission belts 28 on the third fixed pulley 25 and the fourth fixed pulley 26 pass through the second fixed base 22 via three through holes 222, and are connected to the drop chamber 1 or sleeved on the first fixed pulley 23 and the second fixed pulley 24. Specifically, one end of the transmission belt 28 sleeved on the third fixed pulley 25 passes through the through hole 222 at one end of the third fixed pulley 25, and is connected to one end of the transmission belt 28 sleeved on the first fixed pulley 23 via the balance member 4. The other end of the transmission belt 28 sleeved on the third fixed pulley 25 passes through the through hole 222 in the middle, and is connected to the first chamber end cover 12 of the drop chamber 1 via the tension adjustment mechanism 3. The other end of the transmission belt 28 sleeved on the first fixed pulley 23 is connected to the drop chamber 1. On the second compartment end cover 13, similarly, one end of the transmission belt 28, which is sleeved on the fourth fixed pulley 26, passes through the through hole 222 at one end of the fourth fixed pulley 26 and is connected to one end of the transmission belt 28, which is sleeved on the second fixed pulley 24, through the balance member 4. The other end of the transmission belt 28, which is sleeved on the fourth fixed pulley 26, passes through the through hole 222 in the middle and is connected to the first compartment end cover 12 of the falling compartment 1 through the tension adjustment mechanism 3. The other end of the transmission belt 28, which is sleeved on the second fixed pulley 24, is connected to the second compartment end cover 13 of the falling compartment 1. In this way, the transmission belt 28 is connected in series on the first fixed pulley 23, the second fixed pulley 24, the third fixed pulley 25 and the fourth fixed pulley 26.

[0045] It is important to note and understand that, such as Figure 4 As shown, in this application, the transmission belt 28 can be two sections of transmission steel belt / rope. One section connects to one side of the first fixed pulley 23 and the second fixed pulley 24. That is, the middle part of this section of transmission belt 28 is fixedly connected to the second chamber end cover 13 of the drop chamber 1 by a steel belt clamping block. Then, after the first fixed pulley 23 and the second fixed pulley 24 are respectively fitted onto both ends of this section of transmission belt 28, it is fixedly connected to the two balance members 4. Similarly, the other section connects to one side of the third fixed pulley 25 and the fourth fixed pulley 26. That is, the middle part of this section of transmission belt 28 is connected to the first chamber end cover 12 of the drop chamber 1 by a tensioning adjustment mechanism 3. After the two ends of this section of transmission belt 28 pass through the through hole 222 in the middle, they are respectively fitted onto the third fixed pulley 25 and the fourth fixed pulley 26. Then, they pass through the through holes 222 at both ends and are fixedly connected to the two balance members 4, thereby realizing a series connection. In this application, the transmission belt 28 can also be two or more transmission steel belts / ropes connected in a continuous manner, as long as the series connection between the first fixed pulley 23, the second fixed pulley 24, the third fixed pulley 25, and the fourth fixed pulley 26 can be achieved. This application does not impose any limitations on this. The series tensioning falling mechanism in Embodiment 1 of this application can dynamically and synchronously change the pretension of the transmission steel belt / rope. At the same time, based on the principle that the self-tension of a whole transmission steel belt / rope or a continuous whole is the same everywhere, the self-tension of the transmission steel belt / rope can always be ensured to remain unchanged during the assembly and adjustment stage and the stress release deformation self-adjustment stage during subsequent use. This avoids deformation such as twisting and lateral displacement of the support structure and improves the measurement accuracy of the gravimeter.

[0046] In Embodiment 1 of this application, as Figure 3 and Figure 4As shown, the connecting structure 29 includes two first connecting rods 291 and four second connecting rods 292. Specifically, the first fixing base 21 is provided with two first fixing holes 212 and four second fixing holes 213. The two first fixing holes 212 and the four second fixing holes 213 are all located on the edge of the first fixing base 21. The two first fixing holes 212 are located on both sides of the two mounting brackets 27 on the first fixing base 21 along the second direction. The four second fixing holes 213 are symmetrically located on both sides of the two mounting brackets 27 on the first fixing base 21 along the third direction. The center line connecting the two second fixing holes 213 on each side extends along the second direction. Correspondingly, the second fixing base 22 is provided with two third fixing holes 223 and four fourth fixing holes 224. Both the two third fixing holes 223 and the four fourth fixing holes 224 are located at the edge of the second fixing base 22. The two third fixing holes 223 are located on both sides of the two mounting brackets 27 on the second fixing base 22 along the second direction, and the four fourth fixing holes 224 are symmetrically located on both sides of the two mounting brackets 27 on the second fixing base 22 along the third direction. The center line connecting the two fourth fixing holes 224 on each side extends along the second direction. Simultaneously, the central axes of the two first fixing holes 212 are respectively aligned with the central axes of the two third fixing holes 223 along the first direction, and the central axes of the four second fixing holes 213 are respectively aligned with the central axes of the four fourth fixing holes 224 along the first direction. Furthermore, the two first fixing holes 212, the four second fixing holes 213, the two third fixing holes 223 and the four fourth fixing holes 224 are all provided with slit openings 201 to facilitate the insertion and connection of the first connecting rod 291 and the second connecting rod 292. One end of each of the two first connecting rods 291 is respectively disposed in the two first fixing holes 212, and the other end of each of the two first connecting rods 291 is respectively disposed in the two third fixing holes 223. One end of each of the four second connecting rods 292 is respectively disposed in the four second fixing holes 213, and the other end of each of the four second connecting rods 292 is respectively disposed in the four fourth fixing holes 224. After the two first connecting rods 291 and the four second connecting rods 292 are inserted into the corresponding fixing holes, each gap opening 201 is clamped and fixed by at least one fastening bolt 202, so that the two ends of the two first connecting rods 291 and the four second connecting rods 292 are respectively fixed in the fixing holes, thereby fixing the two first connecting rods 291 and the four second connecting rods 292 to the first fixing base 21 and the second fixing base 22.

[0047] like Figure 3As shown, the drop chamber 1 also includes two first bearing mounting seats 14. The two first bearing mounting seats 14 are respectively disposed on the outer side wall of the chamber body 11, and the two first bearing mounting seats 14 are located at both ends of the chamber body 11 along the second direction. Each first bearing mounting seat 14 is slidably mounted on a first connecting rod 291 through a first sliding bearing 16. Thus, the movement of the drop chamber 1 in the plane perpendicular to the first direction is restricted by the first sliding bearing 16 and the first bearing mounting seat 14, so that the drop chamber 1 can only reciprocate along the first reverse direction, and plays an auxiliary support role for the drop chamber 1.

[0048] In the specific implementation process, such as Figure 3 As shown, each of the two first connecting rods 291 is provided with a limiting block 293. Both limiting blocks 293 are located close to the first fixed base 21 and are on the same horizontal plane in the first direction, thereby limiting the movement of the lowering chamber 1 in the first direction. Furthermore, the limiting block 293 has a cylindrical structure, and its diameter matches the diameter of the first sliding bearing 16 to ensure the limiting effect of the limiting block 293. At the same time, the limiting block 293 can also play a buffering role through the spring component inside the first sliding bearing 16.

[0049] Furthermore, such as Figure 3 and Figure 4 As shown, the connecting structure 29 also includes a circular bracket 203, multiple connecting brackets 204, and multiple connecting pins 205. Specifically, one end of each of the multiple connecting brackets 204 is fixedly connected to the first end face 221 of the second fixed base 22, and the other end of each of the multiple connecting brackets 204 is fixedly connected to one end face of the circular bracket 203 along the first direction. The multiple connecting brackets 204 are arranged at equal intervals along the circumference, and the circular bracket 203 is arranged around the outer periphery of the third fixed pulley 25, the fourth fixed pulley 26, and the two mounting brackets 27. Multiple connecting pins 205 are disposed on the circumferential sidewall of the annular bracket 203 and are arranged at equal intervals along the circumferential direction. The central axis of each connecting pin 205 is perpendicular to the first direction. The series tensioned falling mechanism is fixedly connected to the vacuum chamber of the gravimeter through multiple connecting pins 205. Furthermore, the first fixed base 21 is fixed in the vacuum chamber of the gravimeter by multiple bolts to ensure that the series tensioned falling mechanism is assembled in the vacuum chamber of the gravimeter along the first direction, thereby ensuring the realization of free fall motion.

[0050] In Embodiment 1 of this application, as Figure 3 , Figure 6 – Figure 8As shown, each balancing component 4 includes a balancing block body 41, two second bearing mounting seats 42, two second sliding bearings 43, and two clamping blocks 44. Specifically, the main structure of the balancing block body 41 includes two second bearing mounting seats 42 located at both ends of the balancing block body 41 along a second direction. Each second bearing mounting seat 42 houses a second sliding bearing 43. The balancing component 4 slides on two second connecting rods 292 on one side along a third direction via the two second sliding bearings 43. The movement of the balancing component 4 in the plane perpendicular to the first direction is restricted by the two second sliding bearings 43 and the two second bearing mounting seats 42, allowing the balancing component 4 to reciprocate only along the first direction. The two clamping blocks 44 are located at the middle of both ends of the balancing block body 41 along the first direction, and the balancing component 4 is fixedly connected to the transmission belt 28 via the two clamping blocks 44. This achieves a fixed connection between the balancing component 4 and the transmission belt 28. When the drop chamber 1 moves along the first direction, the two balancing components 4 move in the first direction away from the ground so that the overall center of mass of the series tensioned drop mechanism remains unchanged.

[0051] In the specific implementation process, such as Figure 3 , Figure 6 – Figure 8As shown, each balancing component 4 also includes a first fixing block 45, a second fixing block 46, a tension adjusting screw 47, a tension adjusting nut 48, and two positioning blocks 49. Specifically, the balancing block body 41 includes a first end face 414 and a second end face 415 disposed opposite each other along a first direction, wherein the first end face 414 is disposed away from the ground, and the second end face 415 is disposed close to the ground. An adjusting groove 411 is provided in the middle of the first end face 414 of the balancing block body 41, and an adjusting opening 412 is provided at both ends of the adjusting groove 411 along a third direction. Further, a connecting hole 413 is provided in the adjusting groove 411, extending from the adjusting groove 411 to the middle of the second end face 415 of the balancing block body 41 along the first direction. The first fixing block 45 is fixedly installed in the middle of the first end face 414 of the balancing block body 41 by a first fixing bolt 401, and the central axis of the adjusting groove 411 coincides with the central axis of the first fixing block 45. In addition, a first positioning groove 416 is provided on each of the two side walls along the third direction of the balance block body 41, and the first positioning groove 416 is located close to the second end face 415 of the balance block body 41. Correspondingly, a second positioning groove (not shown in the figure) is provided on each of the two side walls along the third direction of the second fixing block 46. The two second positioning grooves are respectively provided in a one-to-one correspondence with the two first positioning grooves 416. Each positioning block 49 is positioned in the corresponding first positioning groove 416 and second positioning groove, and the two ends of each positioning block 49 are fixedly connected to the balance block body 41 and the second fixing block 46 respectively by the second fixing bolts 402, thereby fixing the second fixing block 46 to the second end face 415 of the balance block body 41. The large-diameter end of the tension adjusting nut 48 is abutted within the adjusting groove 411, while the small-diameter end is inserted into the connecting hole 413. The tension adjusting screw 47 passes through the second fixing block 46 into the connecting hole 413 and is threadedly connected to the small-diameter end of the tension adjusting nut 48. The large-diameter end of the tension adjusting nut 48 can be rotated through the adjusting opening 412, thereby adjusting the threaded connection length between the tension adjusting screw 47 and the tension adjusting nut 48. Two clamping blocks 44 are respectively mounted on the first fixing block 45 and the tension adjusting screw 47. By adjusting the threaded connection length between the tension adjusting screw 47 and the tension adjusting nut 48, the distance between the two clamping blocks 44 can be adjusted, thereby adjusting the tension between the transmission belt 28 and the balancer 4, i.e., fine-tuning the tension of the transmission belt 28. It should be noted that the tension adjustment between the transmission belt 28 and the balancer 4 is performed after the overall mechanism is assembled and before the preload adjustment is performed by the tension adjustment mechanism 3.

[0052] In Embodiment 1 of this application, as Figure 3 , Figure 4 and Figure 5The tension adjustment mechanism 3 includes a sliding block 31, an adjusting tension block 32, a sliding structure 33, and two adjusting tension screws 34. Specifically, a receiving groove 17 is provided in the middle of one of the connection ends between the drop chamber 1 and the series rotating mechanism 2, that is, a receiving groove 17 is provided in the middle of the first chamber end cover 12, and the receiving groove 17 extends along the first direction from the end face of the drop chamber 1 toward a direction away from the drop chamber 1. The sliding block 31 is used for the fixed installation of the sliding structure 33. The sliding block 31 is a cavity structure 311 with one end closed, and the closed end of the sliding block 31 is provided with a through hole 312. The shape and size of the cross-section of the sliding block 31 perpendicular to the first direction match the shape and size of the inner cavity of the receiving groove 17 perpendicular to the first direction. The sliding structure 33 is used for the fixed connection of the transmission belt 28. It is set in the cavity structure 311, and the centerline axis of the sliding structure 33 is perpendicular to the first direction. The tension block 32 and two tension screws 34 are used to adjust the tension. The vertical cross-section of the tension block 32 along the first direction is T-shaped, and a through groove 321 extending along the first direction is provided on the tension block 32. The shape and size of the cross-section of the small-diameter end of the tension block 32 perpendicular to the first direction are the same as the shape and size of the cross-section of the sliding block 31 perpendicular to the first direction. The shape and size of the cross-section of the large-diameter end of the tension block 32 perpendicular to the first direction match the outer periphery shape and size of the cross-section of the receiving groove 17 perpendicular to the first direction. The sliding block 31 is disposed in the receiving groove 17, and the closed end of the sliding block 31 is located within the receiving groove 17. On the side of the placement groove 17 away from the drop chamber 1, the small-diameter end of the adjusting tension block 32 is inserted into the receiving groove 17, and the large-diameter end of the adjusting tension block 32 is fixedly connected to the end face of the receiving groove 17 by two adjusting tension screws 34. The transmission belt 28 passes through the through slot 321 and through hole 312 in sequence into the cavity structure 311 and is sleeved on the sliding structure 33. The tension adjustment mechanism 3 adjusts the distance between the large-diameter end of the adjusting tension block 32 and the end face of the receiving groove 17 by two adjusting tension screws 34, thereby adjusting the length of the transmission belt 28 extending into the receiving groove 17, and thus realizing the tension adjustment between the drop chamber 1 and the series rotation mechanism 2.

[0053] Furthermore, such as Figure 5 As shown, the sliding structure 33 can be a pulley, a cylinder, or a hole structure. Furthermore, the sliding structure 33 can be a rotating shaft structure mounted with bearings, or a fixed, non-rotatable shaft structure. In addition, the shaft structure can be fixed by rigid screws or by elastic clamping such as springs. This application does not limit this.

[0054] In Embodiment 1 of this application, as Figure 1 and Figure 3As shown, the driving device is the power equipment that drives the series tensioned falling mechanism. A drive shaft 206 is provided on the first fixed pulley 23, thereby connecting the driving device and the first fixed pulley 23 through the drive shaft 206. The driving device drives the first fixed pulley 23 to rotate, and the series rotation mechanism 2 then realizes the free fall motion of the falling prism. Specifically, during the fall, the driving device gradually accelerates the falling chamber 1 until the acceleration of the falling chamber 1 is slightly greater than g, causing the falling prism 5 to detach from the falling chamber 1 and lag behind it. When the distance between the falling prism 5 and the falling chamber 1 reaches a preset distance, the falling chamber 1 is controlled to maintain a distance from the falling prism 5, thus allowing the falling prism 5 to fall freely without interference. In the specific implementation, the driving device includes a drive motor and a magnetohydrodynamic fluid. The drive motor is located outside the vacuum chamber of the gravimeter, and the output shaft of the drive motor is connected to the drive shaft 206 via a magnetohydrodynamic fluid to ensure the sealing of the vacuum chamber.

[0055] Example 2

[0056] Figure 2 A series tensioned drop mechanism according to Embodiment 2 of this application is shown. Figure 2 As shown, the series tensioning descent mechanism mainly includes: a descent chamber 1, a series rotation mechanism 2, a tension adjustment mechanism 3, two balancing components 4, and a drive device (not shown in the figure).

[0057] The difference between Embodiment 2 of this application and Embodiment 1 of the above application lies in the location of the tension adjustment mechanism 3. In Embodiment 1 of the above application, the tension adjustment mechanism 3 is located at the end of the drop chamber 1 furthest from the ground. In Embodiment 2 of this application, the tension adjustment mechanism 3 is located at the end of the drop chamber 1 closest to the ground. Furthermore, a receiving groove 17 is provided in the middle of the second chamber end cover 13 of the drop chamber 1, and the tension adjustment mechanism 3 is located in the receiving groove 17. The transmission belt 28 is connected to the second chamber end cover 13 of the drop chamber 1 through the tension adjustment mechanism 3, while the first chamber end cover 12 is directly connected to the transmission belt 28 through a steel belt clamping block. The remaining structure and principle of Embodiment 2 of this application are the same as those of Embodiment 1 of the above application. For the sake of brevity, they will not be repeated here. Please refer to the relevant content of Embodiment 1 of the above application.

[0058] This application also discloses a gravimeter, including a series tensioned falling mechanism. The series tensioned falling mechanism is the same as the series tensioned falling mechanism provided in the above embodiments. Its structure and principle are the same as those in the above embodiments. For the sake of brevity, it will not be described in detail here.

[0059] In summary, this application discloses a series tensioning descent mechanism and a gravimeter. The series tensioning structure enables synchronous equal-force pre-tensioning of the structures on both sides of the descent chamber and symmetrical equal-value force application, effectively avoiding excessive twisting, lateral displacement and other deformations of the structures on both sides of the descent chamber, and improving the measurement accuracy of the gravimeter.

[0060] It will be understood by those skilled in the art that the accompanying drawings are merely schematic diagrams of one embodiment, and the components shown in the drawings are not necessarily essential for implementing this invention. It should also be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0061] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0062] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope described in the claims.

Claims

1. A series tensioning type falling mechanism, characterized in that, include: A drop chamber, with the drop prism located inside the drop chamber; A series rotating mechanism is connected to both ends of the drop chamber along the first direction for transmission; The tension adjustment mechanism is located at one of the connection ends between the drop chamber and the series rotating mechanism, and is used to adjust the tension force between the drop chamber and the series rotating mechanism. Two balancing components are respectively connected to the series rotating mechanism, and the two balancing components are symmetrically arranged on both sides of the central axis of the drop chamber, so as to keep the overall center of mass of the series tension drop mechanism unchanged when the drop chamber moves along the first direction. A driving device is connected to the series rotating mechanism and is used to drive the series rotating mechanism to move the drop chamber along the first direction so as to realize the free fall motion of the drop prism in the drop chamber. The first direction is the direction perpendicular to the horizontal ground.

2. The series tensioning lowering mechanism according to claim 1, characterized in that, The series rotation mechanism includes a first fixed base, a second fixed base, a first fixed pulley, a second fixed pulley, a third fixed pulley, a fourth fixed pulley, four mounting brackets, a transmission belt, and a connecting structure. The first fixed base and the second fixed base are fixedly connected by the connecting structure. The first fixed pulley and the second fixed pulley are each fixedly mounted on the first fixed base by one of the mounting brackets. The third fixed pulley and the fourth fixed pulley are each fixedly mounted on the second fixed base by one of the mounting brackets. The first fixed pulley, the second fixed pulley, the third fixed pulley, and the fourth fixed pulley are connected in series by the transmission belt. One end of the transmission belt is connected to one end of the falling chamber along the first direction through the tension adjustment mechanism, and the other end of the transmission belt is connected to the other end of the falling chamber along the first direction.

3. The series tensioning falling mechanism according to claim 2, characterized in that, Both the first fixed base and the second fixed base are plate structures. The first fixed pulley and the second fixed pulley are respectively fixedly mounted on the first end face of the first fixed base near the second fixed base by a mounting bracket. The third fixed pulley and the fourth fixed pulley are respectively fixedly mounted on the first end face of the second fixed base away from the first fixed base by a mounting bracket. The central axes of the first fixed pulley, the second fixed pulley, the third fixed pulley, and the fourth fixed pulley all extend along a second direction. The second fixed base is provided with three through holes, which are arranged sequentially along a third direction. The middle through hole is located between the two mounting brackets on the second fixed base, and the two through holes at both ends are located on both sides of the two mounting brackets on the second fixed base along the third direction. The transmission belts on the third fixed pulley and the fourth fixed pulley pass through the three through holes and pass through the second fixed base, connecting to the lowering chamber or being sleeved on the first fixed pulley and the second fixed pulley. Wherein, the third direction, the second direction, and the first direction are all perpendicular to each other.

4. The series tensioning falling mechanism according to claim 3, characterized in that, The connecting structure includes two first connecting rods and four second connecting rods. The first fixing base has two first fixing holes and four second fixing holes, both located at the edge of the first fixing base. The two first fixing holes are located on both sides of the two mounting brackets on the first fixing base along the second direction, and the four second fixing holes are symmetrically located on both sides of the two mounting brackets on the first fixing base along the third direction. The center line connecting the two second fixing holes on each side extends along the second direction. The second fixing base has two third fixing holes and four fourth fixing holes, both located at the edge of the second fixing base. The two third fixing holes are located on both sides of the two mounting brackets on the second fixing base along the second direction, and the four fourth fixing holes are symmetrically located on both sides of the two mounting brackets on the second fixing base along the third direction. The center lines of all four fourth fixing holes extend along the second direction. The central axes of the two first fixing holes and the central axes of the two third fixing holes are respectively aligned and coincidentally set along the first direction. The central axes of the four second fixing holes and the central axes of the four fourth fixing holes are respectively aligned and coincidentally set along the first direction. Each of the two first fixing holes, the four second fixing holes, the two third fixing holes, and the four fourth fixing holes is provided with a slit opening. One end of each of the two first connecting rods is respectively set in the two first fixing holes, and the other end of each of the two first connecting rods is respectively set in the two third fixing holes. One end of each of the four second connecting rods is respectively set in the four second fixing holes, and the other end of each of the four second connecting rods is respectively set in the four fourth fixing holes. Each slit opening is clamped and fixed by at least one fastening bolt, so that the two first connecting rods and the four second connecting rods are fixed on the first fixing base and the second fixing base.

5. The series tensioning falling mechanism according to claim 4, characterized in that, The drop chamber includes a chamber body, a first chamber end cap, a second chamber end cap, and two first bearing mounting seats. The first chamber end cap and the second chamber end cap are respectively fixedly connected to both ends of the chamber body along the first direction, forming a relatively closed cavity structure. The drop prism is fixedly disposed in the cavity structure. The two first bearing mounting seats are respectively disposed on the outer side wall of the chamber body, and the two first bearing mounting seats are located at both ends of the chamber body along the second direction. Each first bearing mounting seat is slidably mounted on a first connecting rod through a first sliding bearing.

6. The series tensioning falling mechanism according to claim 5, characterized in that, Each of the two first connecting rods is provided with a limiting block. Both limiting blocks are located close to the first fixed base and are on the same horizontal plane in the first direction. The limiting blocks are cylindrical and their diameters match the diameters of the first sliding bearings.

7. The series tensioning falling mechanism according to claim 4, characterized in that, Each balancing component includes a balancing block body, two second bearing mounting seats, two second sliding bearings, and two clamping blocks. The two second bearing mounting seats are disposed at both ends of the balancing block body along the second direction. Each second bearing mounting seat contains one second sliding bearing. The balancing component is slidably mounted on two second connecting rods on one side along the third direction via the two second sliding bearings. The two clamping blocks are disposed at the middle of both ends of the balancing block body along the first direction. The balancing component and the transmission belt are fixedly connected by the two clamping blocks.

8. The series tensioning falling mechanism according to claim 7, characterized in that, Each of the balancing components further includes a first fixing block, a second fixing block, a tension adjusting screw, a tension adjusting nut, and two positioning blocks. The balance block body has an adjusting groove at the center of its first end face along the first direction, and each end of the adjusting groove has an adjusting opening along the third direction. A connecting hole is provided within the adjusting groove, extending from the adjusting groove to the center of the second end face of the balance block body along the first direction. The first fixing block is fixedly installed to the center of the first end face of the balance block body by a first fixing bolt, and the central axis of the adjusting groove coincides with the central axis of the first fixing block. The balance block body has a first positioning groove on each of its two side walls along the third direction, and the first positioning groove is located close to the second end face of the balance block body. The second fixing block is located on each of its two side walls along the third direction. A second positioning groove is provided, and the two second positioning grooves are respectively set one-to-one with the two first positioning grooves. Each positioning block is positioned in the corresponding first positioning groove and second positioning groove, and the two ends of each positioning block are respectively fixedly connected to the balance block body and the second fixing block by second fixing bolts. The large diameter end of the tension adjusting nut is abutted in the adjusting groove, and the small diameter end of the tension adjusting nut is inserted in the communicating hole. The tension adjusting screw passes through the second fixing block to the communicating hole and is threadedly connected to the small diameter end of the tension adjusting nut. Two clamping blocks are respectively set on the first fixing block and the tension adjusting screw. By adjusting the thread connection length between the tension adjusting screw and the tension adjusting nut, the tension between the balance component and the transmission belt is adjusted.

9. The series tensioning falling mechanism according to claim 2, characterized in that, The tension adjustment mechanism includes a sliding block, an adjusting tension block, a sliding structure, and two adjusting tension screws. A receiving groove is provided at the middle of one of the connecting ends of the falling chamber and the series rotating mechanism. The receiving groove extends along the first direction from the end face of the falling chamber toward a direction away from the falling chamber. The sliding block is a cavity structure with one closed end, and a through hole is provided at the closed end. The shape and size of the cross-section of the sliding block perpendicular to the first direction match the shape and size of the inner cavity of the receiving groove perpendicular to the first direction. The sliding structure is disposed within the cavity structure, and the centerline axis of the sliding structure is perpendicular to the first direction. The vertical cross-section of the adjusting tension block along the first direction is T-shaped, and a through groove extending along the first direction is provided on the adjusting tension block. The small-diameter end of the adjusting tension block is perpendicular to the cross-section of the first direction. The shape and size of the sliding block are the same as the cross-sectional shape and size of the sliding block perpendicular to the first direction. The shape and size of the cross-sectional shape and size of the large-diameter end of the adjusting tension block perpendicular to the first direction matches the outer peripheral shape and size of the cross-sectional shape and size of the receiving groove perpendicular to the first direction. The sliding block is disposed in the receiving groove, and the closed end of the sliding block is located on the side of the receiving groove away from the falling chamber. The small-diameter end of the adjusting tension block is inserted into the receiving groove, and the large-diameter end of the adjusting tension block is fixedly connected to the end face of the receiving groove by two adjusting tension screws. The transmission belt passes through the through slot and the through hole in sequence into the cavity structure and is sleeved on the sliding structure. The tension adjustment mechanism adjusts the distance between the large-diameter end of the adjusting tension block and the end face of the receiving groove by two adjusting tension screws to realize the tension adjustment between the falling chamber and the series rotation mechanism.

10. A gravimeter, characterized in that, include: The tandem tensioned drop mechanism according to any one of claims 1–9.

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