Series tensioning type falling mechanism and gravimeter

Abstract

The invention 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] The present application relates to the technical field of gravimeters, and in particular to a series tensioned drop mechanism and a gravimeter. Background Art

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

[0003] There are two main types of vacuum drop system structural designs for mechanical absolute gravimeters at present. The corresponding mainstream drop mechanisms have two structures, one is a drag-free vacuum chamber, and the other is a drag-type vacuum chamber. At present, the drag-type vacuum chamber is the mainstream structural form. The steel belt and other flexible materials used for the drag-type vacuum chamber transmission are independently passed around the upper and lower fixed rollers at both ends and connected in parallel with the upper and lower end surfaces of the drop chamber. However, since the drag-type vacuum chamber drop system is pre-tightened independently by the parallel steel belts / ropes, in order to ensure that the pre-tightening force of the parallel steel belts / ropes is similar, it is necessary to install sensors or tension meters and other means to adjust. However, these methods pre-tighten both sides in turn like a seesaw, resulting in asymmetric deformation, and can only guarantee short-term effectiveness, because as the stress of the falling system is slowly and gradually released, the asymmetric deformation is aggravated after a period of use, and the shape and position of the falling system cannot be guaranteed, resulting in the falling system failing to reach an ideal state. The deformation of the falling track directly causes the falling bin to fail to fall strictly according to the laser wave vector direction determined by the alcohol liquid surface, and ultimately leads to problems such as the shaking rotation of the falling object and the shaking of the falling system, and the interference fringes cannot accurately reflect the displacement of the falling object. At the same time, the existing technology usually uses sensors to detect the pre-tightening force of the steel belt / rope and adjusts them one by one to a close value, but adjusting one by one or adjusting in turns will cause the seesaw problem, and it is impossible to pre-tighten with the same force at the same time. Therefore, although the tension of the parallel steel belt / rope is the same on the surface, the falling system is already in a deformed state, and ultimately the shape and position tolerance of the falling system is destroyed. Summary of the invention

[0004] The present application provides a series tensioned falling mechanism and a gravimeter, which solve the deformation problem caused by the equal force pre-tightening of two sections of transmission belts or transmission ropes that cannot be dynamically synchronized during the assembly process during the assembly and debugging stage of the drag-type vacuum chamber falling system in the prior art.

[0005] The specific technical solutions are as follows:

[0006] In a first aspect, an embodiment of the present application provides a series tensioning drop mechanism, comprising:

[0007] A drop bin, in which the drop prism is located;

[0008] A serial rotating mechanism is transmission-connected to two ends of the drop bin along a first direction;

[0009] A tension adjustment mechanism, the tension adjustment mechanism is arranged at one of the connection ends of the drop bin and the serial rotation mechanism, and the tension adjustment mechanism is used to adjust the tension between the drop bin and the serial rotation mechanism;

[0010] Two balancing members are respectively connected to the serial rotating mechanism in a transmission manner, and the two balancing members are symmetrically arranged on both sides of the central axis of the drop bin, and are used to keep the overall center of mass of the serial tensioning drop mechanism unchanged when the drop bin moves along the first direction;

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

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

[0013] In some embodiments of the present application, the serial 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 via the connecting structure, the first fixed pulley and the second fixed pulley are respectively fixedly arranged on the first fixed base via one mounting bracket, the third fixed pulley and the fourth fixed pulley are respectively fixedly arranged on the second fixed base via one mounting bracket, the first fixed pulley, the second fixed pulley, the third fixed pulley and the fourth fixed pulley are connected in series via the transmission belt, one end of the transmission belt is connected to one end of the lower drop bin along the first direction via the tensioning adjustment mechanism, and the other end of the transmission belt is connected to the other end of the lower drop bin along the first direction.

[0014] In some embodiments of the present application, the first fixed base and the second fixed base are both plate structures, the first fixed pulley and the second fixed pulley are respectively fixedly arranged on the first end surface of the first fixed base close to the second fixed base through one of the mounting brackets, the third fixed pulley and the fourth fixed pulley are respectively fixedly arranged on the first end surface of the second fixed base away from the first fixed base through one of the mounting brackets, and the central axis of the first fixed pulley, the central axis of the second fixed pulley, the central axis of the third fixed pulley and the central axis of the fourth fixed pulley are all extended along the second direction, three through holes are arranged on the second fixed base, the three through holes are arranged in sequence along the third direction, and 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 respectively located on both sides of the two mounting brackets on the second fixed base along the third direction, and the transmission belts on the third fixed pulley and the fourth fixed pulley pass through the second fixed base through the three through holes, and are connected to the drop bin or sleeved on the first fixed pulley and the second fixed pulley;

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

[0016] In some embodiments of the present application, the connecting structure includes two first connecting rods and four second connecting rods, the first fixing base is provided with two first fixing holes and four second fixing holes, the two first fixing holes and the four second fixing holes are all located at the edge of the first fixing base, and the two first fixing holes are located on both sides of the two mounting brackets on the first fixing base along the second direction, 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, and the center line of the two second fixing holes on each side extends along the second direction, the second fixing base is provided with two third fixing holes and four fourth fixing holes, the two third fixing holes and the four fourth fixing holes are all located at the edge of the second fixing base, and 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, And the center lines of the two fourth fixing holes on each side extend along the second direction, the center axes of the two first fixing holes are respectively arranged to overlap with the center axes of the two third fixing holes in a one-to-one correspondence along the first direction, the center axes of the four second fixing holes are respectively arranged to overlap with the center axes of the four fourth fixing holes in a one-to-one correspondence along the first direction, the two first fixing holes, the four second fixing holes, the two third fixing holes and the four fourth fixing holes are all provided with slit openings, one ends of the two first connecting rods are respectively arranged in the two first fixing holes, and the other ends of the two first connecting rods are respectively arranged in the two third fixing holes, one ends of the four second connecting rods are respectively arranged in the four second fixing holes, and the other ends of the four second connecting rods are respectively arranged in the four fourth fixing holes, and each of the slit openings 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 to the first fixing base and the second fixing base.

[0017] In some embodiments of the present application, the falling bin includes a bin body, a first bin body end cover, a second bin body end cover and two first bearing mounting seats, the first bin body end cover and the second bin body end cover are respectively fixedly connected to the two ends of the bin body along the first direction to form a relatively closed cavity structure, the falling prism is fixedly arranged in the cavity structure, the two first bearing mounting seats are respectively arranged on the outer side walls of the bin body, and the two first bearing mounting seats are located at the two ends of the bin body along the second direction, and each of the first bearing mounting seats is slidably arranged on one of the first connecting rods through a first sliding bearing.

[0018] In some embodiments of the present application, a limit block is respectively provided on the two first connecting rods, the two limit blocks are both provided close to the first fixed base, and the two limit blocks are on the same horizontal plane in the first direction, the limit block is a cylindrical structure, and the diameter of the limit block matches the diameter of the first sliding bearing.

[0019] In some embodiments of the present application, each of the balancing members 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 arranged at both ends of the balancing block body along the second direction, and a second sliding bearing is installed in each of the second bearing mounting seats. The balancing member is slidably arranged on two second connecting rods on one side of the third direction through the two second sliding bearings, and the two clamping blocks are arranged in the middle of the two ends of the balancing block body along the first direction, and the balancing member and the transmission belt are fixedly connected through the two clamping blocks.

[0020] In some embodiments of the present application, each of the balancing members further includes a first fixed block, a second fixed block, a tension adjustment screw, a tension adjustment nut and two positioning blocks, an adjustment groove is provided in the middle of the first end surface of the balancing block body along the first direction, and an adjustment opening is provided at both ends of the adjustment groove along the third direction, a connecting hole is provided in the adjusting groove, and the connecting hole passes through the adjusting groove to the middle of the second end surface of the balancing block body along the first direction, the first fixed block is fixedly installed in the middle of the first end surface 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 fixed block, a first positioning groove is provided on each side wall of the balancing block body along the third direction, and the first positioning groove is provided close to the second end surface of the balancing block body, and the second fixed block is provided along the third direction. A second positioning groove is respectively provided on the two side walls of the direction, and the two second positioning grooves are respectively arranged in one-to-one correspondence with the two first positioning grooves, each of the positioning blocks is positioned in the corresponding first positioning groove and the second positioning groove, and the two ends of each positioning block are respectively fixedly connected to the balancing block body and the second fixing block by second fixing bolts, the large diameter end of the tension adjustment nut is abutted in the adjustment groove, the small diameter end of the tension adjustment nut is inserted in the connecting hole, and the tension adjustment screw passes through the second fixing block to the connecting hole and is threadedly connected with the small diameter end of the tension adjustment nut, the two clamping blocks are respectively arranged on the first fixing block and the tension adjustment screw, and the tension adjustment between the balancing piece and the transmission belt is achieved by adjusting the threaded connection length between the tension adjustment screw and the tension adjustment nut.

[0021] In some embodiments of the present application, the tension adjustment mechanism includes a sliding block, an adjustment tension block, a sliding structure and two adjustment tension screws, a receiving groove is provided in the middle of the lower drop bin and one of the connection ends of the serial rotation mechanism, and the receiving groove extends along the first direction from the end face of the lower drop bin toward a direction away from the lower drop bin, the sliding block is a cavity structure closed at one 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 matches the shape and size of the inner cavity of the cross-section of the receiving groove perpendicular to the first direction, the sliding structure is provided in the cavity structure, and the centerline axis of the sliding structure is perpendicular to the first direction, the vertical section of the adjustment tension block along the first direction is T-shaped, and the adjustment tension block is provided with a through groove extending along the first direction, and the small diameter end of the adjustment tension block is perpendicular to the first direction The cross-section of the adjusting tension block has the same shape and size as the cross-section of the sliding block perpendicular to the first direction, the cross-section of the large diameter end of the adjusting tension block perpendicular to the first direction matches the peripheral shape and size of the cross-section of the accommodating groove perpendicular to the first direction, the sliding block is arranged in the accommodating groove, and the closed end of the sliding block is located on the side of the accommodating groove away from the falling bin, the small diameter end of the adjusting tension block is inserted in the accommodating groove, and the large diameter end of the adjusting tension block is fixedly connected to the end face of the accommodating groove by two adjusting tension screws, the transmission belt is successively passed through the through groove and the through hole to the cavity structure, and is sleeved on the sliding structure, and the tension adjustment mechanism adjusts the distance between the large diameter end of the adjusting tension block and the end face of the accommodating groove by the two adjusting tension screws, so as to realize the tension adjustment between the falling bin and the serial rotation mechanism.

[0022] In a second aspect, an embodiment of the present application provides a gravimeter, comprising: the series tensioned falling mechanism described in the first aspect.

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

[0024] The series tensioning drop mechanism adopts a series tensioning structure, which can realize synchronous equal force pre-tightening of the structures on both sides of the drop bin and symmetrical equal force application, effectively avoiding deformation such as excessive twisting and lateral displacement of the structures on both sides of the drop bin, and improving the measurement accuracy of the gravimeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the principle of a series tensioning drop mechanism provided in Example 1 of the present application;

[0027] Figure 2 A schematic diagram of the principle of a series tensioning drop mechanism provided in Example 2 of the present application;

[0028] Figure 3 A structural schematic diagram of a series tensioning drop mechanism provided in Example 1 of the present application;

[0029] Figure 4 A cross-sectional schematic diagram of a series tensioning drop mechanism provided in Example 1 of the present application;

[0030] Figure 5 A schematic structural diagram of a tensioning adjustment mechanism portion in a series tensioning drop mechanism provided in Example 1 of the present application;

[0031] Figure 6 A schematic diagram of the structure of a balancing member in a series tensioning drop mechanism provided in Example 1 of the present application;

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

[0033] Figure 8 A schematic structural diagram of a balancing block main body and two second bearing mounting seats in a series tensioning drop mechanism provided in Example 1 of the present application;

[0034] Description of reference numerals: 1 is a drop bin, 11 is a bin body, 111 is an observation port, 12 is a first bin body end cover, 13 is a second bin body end cover, 131 is a light hole, 14 is a first bearing mounting seat, 15 is a cavity structure, 16 is a first sliding bearing, 17 is a receiving groove, 2 is a serial rotation mechanism, 21 is a first fixed base, 211 is a first end surface of the first fixed base 21, 212 is a first fixing hole, 213 is a second fixing hole, 22 is a second fixed base, 221 is a first end surface of the second fixed base 22, 222 is a through hole, 223 is a third fixed hole, 224 is a fourth fixed hole, 23 is a first fixed pulley, 24 is a second fixed pulley, 25 is a third fixed pulley, 26 is a fourth fixed pulley, 27 is a mounting bracket, 28 is a transmission belt, 29 is a connecting structure, 291 is a first connecting rod, 292 is a second connecting rod, 293 is a limit block, and 201 is a gap opening , 202 is a fastening bolt, 203 is a ring bracket, 204 is a connecting bracket, 205 is a connecting pin, 206 is a driving 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 adjustment tension block, 321 is a through slot, 33 is a sliding structure, 34 is an adjustment tension screw, 4 is a balancing piece, 41 is a balancing block body, 411 is an adjustment groove, 412 is an adjustment opening, 413 is The connecting hole, 414 is the first end face of the balancing block body 41, 415 is the second end face of the balancing 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 DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

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

[0037] The embodiment of the present application discloses a series tensioning drop mechanism, which is described in detail below.

[0038] Embodiment 1

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

[0040] In the present application, the first direction is a direction perpendicular to the horizontal ground, and the first direction, the second direction and the third direction are perpendicular to each other. It should be noted that the vertical in the present application is not absolutely vertical, and can be 90°±10°.

[0041] In the first embodiment of the present application, Figure 3 and Figure 4As shown, the drop bin 1 is the main component of the series tension drop mechanism, which is used to carry the drop prism 5, plays a receiving role when the drop prism 5 ends falling, and carries the drop prism 5 to slowly rise to the starting point to prepare for the next drop. In the specific implementation process, the drop bin 1 mainly includes a bin body 11, a first bin body end cover 12 and a second bin body end cover 13. The first bin body end cover 12 and the second bin body end cover 13 are respectively fixedly connected to the two ends of the bin body 11 along the first direction to form a relatively closed cavity structure 15, and the drop prism 5 is fixedly arranged in the cavity structure 15. Further, the first bin body end cover 12 is located at the end of the bin body 11 away from the ground, and the second bin body end cover 13 is located at the end of the bin body 11 close to the ground. The first bin body end cover 12 and the second bin body end cover 13 are respectively fixedly connected to the two ends of the bin body 11 by a plurality of bolts. Two light holes 131 are symmetrically arranged on the second bin body end cover 13, so that the laser can enter and exit the cavity structure 15 through the two light holes 131, and the moving position of the falling prism 5 in the free fall motion process can be accurately measured, and then the gravimeter calculates the gravity acceleration of the falling prism 5 according to the measured motion trajectory. In addition, an observation port 111 can also be arranged on the bin body 11 to facilitate understanding of the internal situation of the falling bin 1.

[0042] The serial tensioning falling mechanism adopts a serially connected power transmission mechanism, namely, a serial rotating mechanism 2, which is one of the main innovations of the present application. Compared with the parallel-connected falling mechanism in the prior art, it can realize dynamic and synchronous equal-force pre-tightening adjustment during the assembly and debugging stage of the drag-type vacuum chamber falling system, thereby solving the problem of asymmetric deformation caused by the seesaw problem caused by adjusting one by one or adjusting in turns in the prior art.

[0043] In the first embodiment of the present application, Figure 3 and Figure 4As shown, the serial 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 respectively 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. In detail, the first fixed pulley 23 and the second fixed pulley 24 are respectively fixedly arranged on the first fixed base 21 through a mounting bracket 27, and the third fixed pulley 25 and the fourth fixed pulley 26 are respectively fixedly arranged on the second fixed base 22 through a mounting bracket 27. The first fixed base 21 and the second fixed base 22 are fixedly connected by a connecting structure 29 to provide a movement space for the drop bin 1 to move along 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 through the transmission belt 28, and one end of the transmission belt 28 is connected to one end of the drop bin 1 along the first direction through the tensioning adjustment mechanism 3, and the other end of the transmission belt 28 is connected to the other end of the drop bin 1 along the first direction, so as to form a series-connected power transmission mechanism. In further detail, one end of the transmission belt 28 is connected to the first bin body end cover 12 of the drop bin 1 through the tensioning adjustment mechanism 3, and the other end of the transmission belt 28 is connected to the second bin body end cover 13 of the drop bin 1.

[0044] In the specific implementation process, Figure 3 and Figure 4As shown, the first fixed base 21 and the second fixed base 22 are both plate structures. Among them, the first fixed base 21 includes a first end face 211 and a second end face (not shown in the figure) arranged opposite to each other along the first direction, the first end face 211 is arranged away from the ground, and the first fixed pulley 23 and the second fixed pulley 24 are respectively fixedly arranged on the first end face 211 of the first fixed base 21 close to the second fixed base 22 through a mounting bracket 27. The second fixed base 22 includes a first end face 221 and a second end face (not shown in the figure) arranged opposite to each other along the first direction, the first end face 221 is arranged away from the ground, and the third fixed pulley 25 and the fourth fixed pulley 26 are respectively fixedly arranged on the first end face 221 of the second fixed base 22 away from the first fixed base 21 through a mounting bracket 27. At the same time, the central axis of the first fixed pulley 23, the central axis of the second fixed pulley 24, the central axis of the third fixed pulley 25, and the central axis of the fourth fixed pulley 26 are all extended along the second direction. Furthermore, three through holes 222 are provided on the second fixed base 22, and the three through holes 222 are arranged in sequence along the third direction, and 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 located at both ends are respectively 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 respectively located between two 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 through three through holes 222, and are connected to the drop bin 1 or are sleeved on the first fixed pulley 23 and the second fixed pulley 24. In detail, one end of the transmission belt 28 sleeved on the third fixed pulley 25 passes through the through hole 222 located 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 through the balance member 4, and the other end of the transmission belt 28 sleeved on the third fixed pulley 25 passes through the through hole 222 located in the middle, and is connected to the first bin body end cover 12 of the drop bin 1 through the tensioning adjustment mechanism 3, and the other end of the transmission belt 28 sleeved on the first fixed pulley 23 is connected to the drop bin 1 On the second warehouse body end cover 13, similarly, one end of the transmission belt 28 sleeved on the fourth fixed pulley 26 passes through the through hole 222 located at one end of the fourth fixed pulley 26, and is connected to one end of the transmission belt 28 sleeved on the second fixed pulley 24 through the balance member 4, the other end of the transmission belt 28 sleeved on the fourth fixed pulley 26 passes through the through hole 222 located in the middle, and is connected to the first warehouse body end cover 12 of the falling warehouse 1 through the tensioning adjustment mechanism 3, and the other end of the transmission belt 28 sleeved on the second fixed pulley 24 is connected to the second warehouse body end cover 13 of the falling warehouse 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 if Figure 4 As shown, the transmission belt 28 in the present application can be two sections of transmission steel belts / ropes, one of which realizes the connection on one side of the first fixed pulley 23 and the second fixed pulley 24, that is, the middle part of the transmission belt 28 is fixedly connected to the second bin body end cover 13 of the falling bin 1 through a steel belt clamping block, and then the two ends of the transmission belt 28 are respectively sleeved on the first fixed pulley 23 and the second fixed pulley 24, and then fixedly connected to the two balance members 4. Similarly, the other section realizes the connection on one side of the third fixed pulley 25 and the fourth fixed pulley 26, that is, the middle part of the transmission belt 28 is connected to the first bin body end cover 12 of the falling bin 1 through the tensioning adjustment mechanism 3, and the two ends of the transmission belt 28 are respectively sleeved on the third fixed pulley 25 and the fourth fixed pulley 26 after passing through the through hole 222 located in the middle, and then through holes 222 located at both ends are respectively passed through to be fixedly connected to the two balance members 4, thereby realizing series connection. In the present application, the transmission belt 28 can also be more than two sections of transmission steel belts / ropes connected in a continuous form, as long as it is ensured that the first fixed pulley 23, the second fixed pulley 24, the third fixed pulley 25, and the fourth fixed pulley 26 can be connected in series, and the present application does not impose any restrictions on this. The serial tensioning drop mechanism in the first embodiment of the present application can make the pre-tensioning force of the transmission steel belt / rope dynamically and synchronously change. At the same time, according to the principle that the self-tensioning force of a whole or connected transmission steel belt / rope is the same everywhere, the self-tensioning force of the transmission steel belt / rope can always be ensured to be unchanged during the assembly adjustment stage and the subsequent use of the stress release deformation self-adjustment stage, avoiding deformation such as distortion and lateral displacement of the support structure, and improving the measurement accuracy of the gravimeter.

[0046] In the first embodiment of the present application, Figure 3 and Figure 4As shown, the connection structure 29 includes two first connection rods 291 and four second connection rods 292. Specifically, two first fixing holes 212 and four second fixing holes 213 are provided on the first fixed base 21, the two first fixing holes 212 and the four second fixing holes 213 are all located at the edge of the first fixed base 21, and the two first fixing holes 212 are located on both sides of the two mounting brackets 27 on the first fixed 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 fixed base 21 along the third direction, and the center line of the two second fixing holes 213 on each side extends along the second direction. Correspondingly, two third fixing holes 223 and four fourth fixing holes 224 are provided on the second fixing base 22, and the two third fixing holes 223 and the four fourth fixing holes 224 are all located at the edge of the second fixing base 22, and 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, and the center line of the two fourth fixing holes 224 on each side extends along the second direction. At the same time, the central axes of the two first fixing holes 212 are respectively arranged to overlap with the central axes of the two third fixing holes 223 in a one-to-one correspondence along the first direction, and the central axes of the four second fixing holes 213 are respectively arranged to overlap with the central axes of the four fourth fixing holes 224 in a one-to-one correspondence 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 the two first connecting rods 291 is respectively arranged in the two first fixing holes 212, and the other ends of the two first connecting rods 291 are respectively arranged in the two third fixing holes 223, one end of the four second connecting rods 292 is respectively arranged in the four second fixing holes 213, and the other ends of the four second connecting rods 292 are respectively arranged 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 to fix the two ends of the two first connecting rods 291 and the four second connecting rods 292 in each fixing hole, so that the two first connecting rods 291 and the four second connecting rods 292 are fixed on the first fixed base 21 and the second fixed base 22.

[0047] like Figure 3As shown, the drop bin 1 also includes two first bearing mounting seats 14, which are respectively arranged on the outer side walls of the bin body 11, and the two first bearing mounting seats 14 are located at both ends of the bin body 11 along the second direction, and each first bearing mounting seat 14 is slidably arranged on a first connecting rod 291 through a first sliding bearing 16, thereby limiting the movement of the drop bin 1 on a plane perpendicular to the first direction through the first sliding bearing 16 and the first bearing mounting seat 14, so that the drop bin 1 can only reciprocate along the first reverse direction, and plays an auxiliary supporting role for the drop bin 1.

[0048] In the specific implementation process, Figure 3 As shown, a limit block 293 is respectively provided on the two first connecting rods 291, and the two limit blocks 293 are both provided close to the first fixed base 21, and the two limit blocks 293 are on the same horizontal plane in the first direction, so that the movement of the drop bin 1 in the first direction is limited by the two limit blocks 293. Further, the limit block 293 is a cylindrical structure, and the diameter of the limit block 293 matches the diameter of the first sliding bearing 16 to ensure the limiting effect of the limit block 293, and the limit block 293 can also play a buffering role through the spring component inside the first sliding bearing 16.

[0049] Further, such as Figure 3 and Figure 4 As shown, the connection structure 29 also includes a circular bracket 203, a plurality of connection brackets 204 and a plurality of connection pins 205. In detail, one end of the plurality of connection brackets 204 is respectively fixedly connected to the first end face 221 of the second fixed base 22, and the other ends of the plurality of connection brackets 204 are respectively fixedly connected to one end face of the circular bracket 203 along the first direction, and the plurality of connection brackets 204 are arranged at equal distances in the circumferential direction, and the circular bracket 203 is arranged around the outer circumference of the third fixed pulley 25, the fourth fixed pulley 26 and the two mounting brackets 27. Multiple connecting pins 205 are arranged on the circumferential side wall of the ring bracket 203 and are arranged equidistantly along the circumferential direction. The central axis of each connecting pin 205 is arranged 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 to the vacuum chamber of the gravimeter through 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 the first embodiment of the present application, Figure 3 , Figure 6 – Figure 8As shown, each balancing member 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, the two second bearing mounting seats 42 are arranged at the two ends of the balancing block body 41 along the second direction, and a second sliding bearing 43 is installed in each second bearing mounting seat 42. The balancing member 4 is slidably arranged on the two second connecting rods 292 on one side along the third direction through the two second sliding bearings 43, so that the movement of the balancing member 4 in the plane perpendicular to the first direction is limited by the two second sliding bearings 43 and the two second bearing mounting seats 42, so that the balancing member 4 can only reciprocate along the first direction. The two clamping blocks 44 are arranged in the middle of the two ends of the balancing block body 41 along the first direction, and the balancing member 4 is fixedly connected to the transmission belt 28 through the two clamping blocks 44. Thereby, a fixed connection between the balancing member 4 and the transmission belt 28 is achieved. When the drop bin 1 moves along the first direction, the two balancing members 4 move along the first direction away from the ground, so that the overall center of mass of the series tensioning drop mechanism remains unchanged.

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

[0052] In the first embodiment of the present application, Figure 3 , Figure 4 and Figure 5The tension adjustment mechanism 3 includes a sliding block 31, an adjustment tension block 32, a sliding structure 33 and two adjustment tension screws 34. Specifically, a receiving groove 17 is provided in the middle of one of the connection ends of the drop bin 1 and the serial rotation mechanism 2, that is, a receiving groove 17 is provided in the middle of the first bin body end cover 12, and the receiving groove 17 is extended from the end face of the drop bin 1 in the direction away from the drop bin 1 along the first direction. 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 a through hole 312 is provided at the closed end of the sliding block 31. 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 cross section 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 arranged 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 the two tension screws 34 are used to adjust the tension force. The vertical section of the tension block 32 along the first direction is T-shaped, and the tension block 32 is provided with a through slot 321 extending along the first direction. The cross section of the small diameter end of the tension block 32 perpendicular to the first direction is the same as the cross section of the sliding block 31 perpendicular to the first direction. The cross section of the large diameter end of the tension block 32 perpendicular to the first direction matches the outer shape of the cross section of the accommodating groove 17 perpendicular to the first direction. The sliding block 31 is arranged in the accommodating groove 17, and the closed end of the sliding block 31 is located in the accommodating groove 17. The slot 17 is located on the side away from the drop bin 1, the small diameter end of the adjusting tension block 32 is inserted into the receiving slot 17, and the large diameter end of the adjusting tension block 32 is fixedly connected to the end face of the receiving slot 17 by two adjusting tension screws 34, the transmission belt 28 is sequentially passed through the through slot 321 and the hole 312 to 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 slot 17 by two adjusting tension screws 34, thereby adjusting the length of the transmission belt 28 extending into the receiving slot 17, thereby realizing the tension adjustment between the drop bin 1 and the serial rotation mechanism 2.

[0053] Further, such as Figure 5 As shown, the sliding structure 33 can be either a pulley or a cylindrical or hole structure. Furthermore, the sliding structure 33 can be a rotating shaft structure installed with a bearing, or a fixed non-rotating shaft structure. In addition, the shaft structure can be fixed by rigid screws or by elastic compression such as springs, and the present application does not impose any restrictions on this.

[0054] In the first embodiment of the present application, Figure 1 and Figure 3As shown, the driving device is a power device for driving the series tensioning falling mechanism. A driving shaft 206 is provided on the first fixed pulley 23, and the connection between the driving device and the first fixed pulley 23 is realized through the driving shaft 206, so that the driving device drives the first fixed pulley 23 to rotate, and then the free fall motion of the falling prism is realized through the series rotating mechanism 2. In detail, when falling, the driving device drives the falling bin 1 to gradually accelerate until the acceleration of the falling bin 1 is slightly greater than g, so that the falling prism 5 is separated from the falling bin 1 and lags behind the falling bin 1. When the distance between the falling prism 5 and the falling bin 1 reaches a preset distance, the falling bin 1 is controlled to maintain the distance from the falling prism 5, so that the falling prism 5 is free to fall without interference. In the specific implementation process, the driving device includes a driving motor and a magnetic fluid. The driving motor is arranged outside the vacuum chamber of the gravimeter, and the output shaft of the driving motor is connected to the driving shaft 206 through the magnetic fluid to ensure the sealing of the vacuum chamber.

[0055] Embodiment 2

[0056] Figure 2 A series tensioning drop mechanism according to the second embodiment of the present application is shown. Figure 2 As shown, the series tensioning falling mechanism mainly includes: a falling bin 1, a series rotating mechanism 2, a tensioning adjustment mechanism 3, two balancing members 4 and a driving device (not shown in the figure).

[0057] The difference between the second embodiment of the present application and the first embodiment of the above application is that the setting position of the tension adjustment mechanism 3 is different. The tension adjustment mechanism 3 in the first embodiment of the above application is set at the end of the drop bin 1 away from the ground. The tension adjustment mechanism 3 in the second embodiment of the present application is set at the end of the drop bin 1 close to the ground. Furthermore, a receiving groove 17 is provided in the middle of the second bin body end cover 13 of the drop bin 1, and the tension adjustment mechanism 3 is provided in the receiving groove 17. The transmission belt 28 is connected to the second bin body end cover 13 of the drop bin 1 through the tension adjustment mechanism 3, and the first bin body end cover 12 is directly connected to the transmission belt 28 through a steel belt clamping block. The rest of the structure and principle of the second embodiment of the present application are the same as those of the first embodiment of the above application. For the sake of brief description, they are not repeated here. Please refer to the relevant content of the first embodiment of the above application.

[0058] The embodiment of the present application also discloses a gravimeter, including: a serial tensioned falling mechanism, which is the serial tensioned falling mechanism provided in the above embodiment, and its structure and principle are the same as those in the above embodiment, and will not be repeated here for the sake of brief description.

[0059] In summary, the present application discloses a series tensioning falling mechanism and a gravimeter. The series tensioning structure can realize synchronous equal force pre-tightening of the structures on both sides of the falling bin and symmetrical and equal force application, thereby effectively avoiding excessive twisting, lateral displacement and other deformations of the structures on both sides of the falling bin and improving the measurement accuracy of the gravimeter.

[0060] Those skilled in the art will appreciate that the drawings are only schematic diagrams of an embodiment, and the components in the drawings are not necessarily necessary to implement the present invention. It should also be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0061] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope described in the claims.

Claims

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

2. The tandem tensioning drop mechanism according to claim 1, characterized in that: The serial 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, wherein the first fixed base and the second fixed base are fixedly connected through the connecting structure, the first fixed pulley and the second fixed pulley are respectively fixedly arranged on the first fixed base through one of the mounting brackets, the third fixed pulley and the fourth fixed pulley are respectively fixedly arranged on the second fixed base through 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 through the transmission belt, one end of the transmission belt is connected to one end of the lower drop bin along the first direction through the tensioning adjustment mechanism, and the other end of the transmission belt is connected to the other end of the lower drop bin along the first direction.

3. The tandem tensioning drop mechanism according to claim 2, characterized in that: The first fixed base and the second fixed base are both plate structures, the first fixed pulley and the second fixed pulley are respectively fixedly arranged on the first end surface of the first fixed base close to the second fixed base through one of the mounting brackets, the third fixed pulley and the fourth fixed pulley are respectively fixedly arranged on the first end surface of the second fixed base away from the first fixed base through one of the mounting brackets, and the central axis of the first fixed pulley, the central axis of the second fixed pulley, the central axis of the third fixed pulley and the central axis of the fourth fixed pulley are all extended along the second direction, three through holes are arranged on the second fixed base, the three through holes are arranged in sequence along the third direction, and the through hole located in the middle is located between the two mounting brackets on the second fixed base, and the two through holes located at the two ends are respectively located on both sides of the two mounting brackets on the second fixed base along the third direction, and the transmission belts on the third fixed pulley and the fourth fixed pulley pass through the second fixed base through the three through holes, and are connected to the drop bin or sleeved on the first fixed pulley and the second fixed pulley; The third direction, the second direction and the first direction are perpendicular to each other.

4. The tandem tensioning drop mechanism according to claim 3, characterized in that: The connecting structure includes two first connecting rods and four second connecting rods, and the first fixing base is provided with two first fixing holes and four second fixing holes, the two first fixing holes and the four second fixing holes are all located at the edge of the first fixing base, and the two first fixing holes are located on both sides of the two mounting brackets on the first fixing base along the second direction, 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, and the center lines of the two second fixing holes on each side extend along the second direction, and the second fixing base is provided with two third fixing holes and four fourth fixing holes, the two third fixing holes and the four fourth fixing holes are all located at the edge of the second fixing base, and the two third fixing holes are located on both sides of the two mounting brackets on the second fixing base along the second direction, 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, and the two on each side The center lines of the four fourth fixing holes all extend along the second direction, the center axes of the two first fixing holes are respectively arranged to overlap with the center axes of the two third fixing holes in a one-to-one correspondence along the first direction, the center axes of the four second fixing holes are respectively arranged to overlap with the center axes of the four fourth fixing holes in a one-to-one correspondence along the first direction, the two first fixing holes, the four second fixing holes, the two third fixing holes and the four fourth fixing holes are all provided with slit openings, one ends of the two first connecting rods are respectively arranged in the two first fixing holes, and the other ends of the two first connecting rods are respectively arranged in the two third fixing holes, one ends of the four second connecting rods are respectively arranged in the four second fixing holes, and the other ends of the four second connecting rods are respectively arranged in the four fourth fixing holes, and each of the slit openings 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 to the first fixing base and the second fixing base.

5. The tandem tensioning drop mechanism according to claim 4, characterized in that: The falling bin includes a bin body, a first bin body end cover, a second bin body end cover and two first bearing mounting seats, the first bin body end cover and the second bin body end cover are respectively fixedly connected to the two ends of the bin body along the first direction to form a relatively closed cavity structure, the falling prism is fixedly arranged in the cavity structure, the two first bearing mounting seats are respectively arranged on the outer side walls of the bin body, and the two first bearing mounting seats are located at the two ends of the bin body along the second direction, and each of the first bearing mounting seats is slidably arranged on one of the first connecting rods through a first sliding bearing.

6. The tandem tensioning drop mechanism according to claim 5, characterized in that: A limit block is respectively arranged on the two first connecting rods, the two limit blocks are arranged close to the first fixed base, and the two limit blocks are on the same horizontal plane in the first direction. The limit block is a cylindrical structure, and the diameter of the limit block matches the diameter of the first sliding bearing.

7. The tandem tensioning drop mechanism according to claim 4, characterized in that: Each of the balancing members 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 arranged at the two ends of the balancing block body along the second direction. A second sliding bearing is installed in each of the second bearing mounting seats. The balancing member is slidably arranged on the two second connecting rods on one side of the third direction through the two second sliding bearings. The two clamping blocks are arranged in the middle of the two ends of the balancing block body along the first direction. The balancing member and the transmission belt are fixedly connected through the two clamping blocks.

8. The tandem tensioning drop mechanism according to claim 7, characterized in that: Each of the balancing members further comprises a first fixing block, a second fixing block, a tension adjustment screw, a tension adjustment nut and two positioning blocks, an adjustment groove is provided in the middle of the first end face of the balancing block body along the first direction, and an adjustment opening is provided at both ends of the adjustment groove along the third direction, a connecting hole is provided in the adjusting groove, and the connecting hole passes through the adjusting groove to the middle of the second end face of the balancing block body along the first direction, the first fixing block is fixedly installed in the middle 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, a first positioning groove is respectively provided on the two side walls of the balancing block body along the third direction, and the first positioning groove is provided close to the second end face of the balancing block body, and the second fixing block is divided into two sides along the two side walls of the third direction A second positioning groove is separately provided, and the two second positioning grooves are respectively arranged in one-to-one correspondence with the two first positioning grooves, each of the positioning blocks is positioned in the corresponding first positioning groove and the second positioning groove, and the two ends of each positioning block are respectively fixedly connected to the balancing block body and the second fixing block by second fixing bolts, the large diameter end of the tension adjustment nut is abutted in the adjustment groove, the small diameter end of the tension adjustment nut is inserted in the connecting hole, and the tension adjustment screw passes through the second fixing block to the connecting hole and is threadedly connected with the small diameter end of the tension adjustment nut, the two clamping blocks are respectively arranged on the first fixing block and the tension adjustment screw, and the tension adjustment between the balancing piece and the transmission belt is achieved by adjusting the threaded connection length between the tension adjustment screw and the tension adjustment nut.

9. The tandem tensioning drop mechanism according to claim 2, characterized in that: The tension adjustment mechanism includes a sliding block, an adjustment tension block, a sliding structure and two adjustment tension screws. A receiving groove is provided in the middle of the lower drop bin and one of the connection ends of the serial rotation mechanism, and the receiving groove extends along the first direction from the end face of the lower drop bin toward a direction away from the lower drop bin. The sliding block is a cavity structure closed at one 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 cross section of the receiving groove perpendicular to the first direction. The sliding structure is arranged in the cavity structure, and the centerline axis of the sliding structure is perpendicular to the first direction. The vertical section of the adjustment tension block along the first direction is T-shaped, and the adjustment tension block is provided with a through groove extending along the first direction. The small diameter end of the adjustment tension block is perpendicular to the shape of the cross section of the first direction. The shape and size 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 peripheral shape and size of the cross section of the accommodating groove perpendicular to the first direction, the sliding block is arranged in the accommodating groove, and the closed end of the sliding block is located on the side of the accommodating groove away from the falling bin, the small diameter end of the adjusting tension block is inserted in the accommodating groove, and the large diameter end of the adjusting tension block is fixedly connected to the end face of the accommodating groove by two adjusting tension screws, the transmission belt is successively passed through the through groove and the through hole to the cavity structure, and is sleeved on the sliding structure, and the tension adjustment mechanism adjusts the distance between the large diameter end of the adjusting tension block and the end face of the accommodating groove by the two adjusting tension screws, so as to realize the tension adjustment between the falling bin and the serial rotation mechanism.

10. A gravimeter, characterized in that: include: A serial tensioned falling mechanism as described in any one of claims 1-9.

Images