Automatic pendulum locking device of spring type gravimeter

Abstract

The invention discloses a spring type gravimeter automatic pendulum locking device, and relates to the technical field of relative gravimeters, the spring type gravimeter automatic pendulum locking device comprises a gravimeter body and a reading knob rotatably arranged on the gravimeter body, and the gravimeter body is also internally and rotatably provided with a swing rod and a zero-length spring used for keeping the swing rod in a horizontal state; comprising a trigger unit which is arranged in a gravimeter body and is used for detecting the stable state of the gravimeter body, and a trigger rod which inclines under weightlessness. According to the spring type gravimeter automatic pendulum locking device, when a gravimeter body is collided, acting force generated by collision enables the trigger rod to shake, so that the upper pressing plate and the lower pressing plate are driven to be close to each other and lock the pendulum rod, and the pendulum rod is prevented from being damaged. And the inner bag is expanded and abuts against the inner ring of the zero-length spring from the interior, bending deformation of the zero-length spring on the shaft diameter due to violent shaking is difficult to generate through the supporting effect of the inner bag, physical fatigue caused by shaking of the zero-length spring can be avoided, and the service time of the device is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of relative gravimeters, and in particular to an automatic pendulum locking device for a spring-type gravimeter. Background Art

[0002] Spring-type gravimeters are commonly used in resource exploration, detecting underground density anomalies in oil and gas fields, and monitoring geological hazards such as mineral deposits. They are also used in military and engineering applications for submarine navigation and foundation settlement detection, providing geographical mapping information for diverse regions. This requires the instruments to be transported to various locations. To address the pendulum vibration issues associated with spring-type gravimeters during transportation, movement, or non-operating conditions, a highly reliable and fast-response automatic pendulum locking device is required. This device automatically locks the pendulum when the device is moved or subjected to impact, preventing mechanical damage.

[0003] In conjunction with publication number CN107422389B, published on July 14, 2023, an automatic pendulum locking device for a metal spring gravimeter is disclosed. The device comprises an insulated housing, wherein a suspension rod, a frame, a measuring spring, a mass pendulum, a pendulum locking fixture, and a fixture control mechanism are disposed within the insulated housing. The frame is suspended and fixed within the insulated housing via the suspension rod, the mass pendulum is suspended within the frame via the measuring spring, and the pendulum locking fixture is relatively fixed within the frame. The fixture control mechanism drives the pendulum locking fixture to release or lock the mass pendulum. The fixture control mechanism includes a motor and a temperature sensor, the temperature sensor being located within the insulated housing and electrically connected to the motor. The device reduces assembly difficulty by modifying the pendulum locking fixture structure. Furthermore, a fixture control mechanism is added, which utilizes a temperature sensor to monitor the temperature within the insulated housing. Only when the temperature meets the required level will the servo motor drive the pendulum locking fixture within the frame to release or lock the mass pendulum, thereby preventing damage to the instrument caused by manual pendulum locking due to misoperation.

[0004] However, in the prior art including the above-mentioned patent, the mass pendulum is locked by clamping. However, since the spring itself also has weight and the end of the spring pulls the mass pendulum, only the mass pendulum is clamped during the oscillation process, which is equivalent to restricting the end of the spring. However, the spring itself will swing under the action of inertia, which will cause the spring to bend and twist in the axial direction, resulting in physical fatigue. Summary of the Invention

[0005] The purpose of the present invention is to provide a spring-type gravimeter automatic pendulum locking device to solve the above-mentioned problems.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a spring-type gravimeter automatic pendulum locking device, comprising a gravimeter body and a reading knob rotatably disposed thereon, wherein a pendulum rod and a zero-length spring for maintaining the pendulum rod in a horizontal state are also rotatably disposed within the gravimeter body, and a trigger unit for detecting the stable state of the gravimeter body is included within the gravimeter body, comprising a trigger rod rotatably disposed on the inner wall of the gravimeter body and tilted under weightlessness; An upper pressing plate and a lower pressing plate are arranged to slide in the vertical direction, and the upper pressing plate and the lower pressing plate lock the swing arm as the trigger rod tilts; An inner capsule is rotatably disposed in the body of the gravimeter, on which a suspension unit is disposed for keeping the inner capsule coaxial with the zero-length spring, the suspension unit including a balancing torsion spring; The connecting tube is fixedly arranged on the inner capsule and is used to expand the inner capsule when the trigger rod is in a tilted state to limit the zero-length spring.

[0007] Preferably, the device further comprises a tension spring provided on the trigger rod to keep the trigger rod in a vertical state, and a heavy hammer is provided on the top end of the trigger rod.

[0008] Preferably, it further comprises a fixing base fixedly arranged in the gravimeter body, on which a connecting base for connecting a tension spring is arranged, and the center of gravity of the trigger rod in the vertical state is coaxial with the tension spring.

[0009] Preferably, the material of the balancing torsion spring is consistent with that of the zero-length spring.

[0010] Preferably, the suspension unit includes a rotating rod for supporting the inner capsule, and a counterweight is provided on the rotating rod.

[0011] Preferably, the suspension unit includes an expansion bag connected to the connecting tube and used to lock the rotating rod.

[0012] Preferably, the device further comprises a protective cover which is movably arranged on the gravimeter body and is used to limit the reading knob, and a telescopic airbag is rotatably arranged on the protective cover for maintaining a predetermined height.

[0013] Preferably, it also includes a trigger disk that is rotatably arranged in the gravimeter body and keeps synchronous movement with the trigger rod, and a plurality of elastic clamping keys for clamping the protective cover are arranged in a circular array on the trigger disk, and the elastic clamping keys are provided with protrusions.

[0014] Preferably, the protective cover is provided with a plurality of slots and annular grooves for slidingly cooperating with the protrusions; The annular groove is used to lead the elastic latch into or out of the latch groove.

[0015] Preferably, the telescopic airbag is connected to the connecting pipe.

[0016] In the above-mentioned technical solution, the present invention provides a spring-loaded gravimeter automatic pendulum locking device with the following beneficial effects: When the gravimeter body is impacted, the force generated by the collision causes the trigger lever to vibrate, thereby driving the upper and lower pressure plates toward each other and locking the pendulum, preventing damage to the pendulum. Furthermore, the internal capsule expands and internally supports the inner coil of the zero-length spring. This support makes it less likely that the zero-length spring will bend along its axis due to severe shaking, thus preventing physical fatigue of the zero-length spring caused by shaking and extending the device's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 An overall three-dimensional schematic diagram provided for an embodiment of the present invention; Figure 2 A right side view of the internal structure of a gravimeter provided by an embodiment of the present invention; Figure 3 A left side view of the internal structure of a gravimeter provided by an embodiment of the present invention; Figure 4 A schematic diagram of the internal structure of a gravimeter provided by an embodiment of the present invention; Figure 5 A dynamic schematic diagram of the swing arm and trigger arm structure provided by an embodiment of the present invention; Figure 6 A schematic diagram of the structure of the swing arm and the trigger arm provided in an embodiment of the present invention; Figure 7 A schematic diagram of the inner capsule and ferrule structure provided in an embodiment of the present invention; Figure 8 A schematic diagram of the position of the connecting pipe and the air cavity provided in an embodiment of the present invention; Figure 9 A schematic diagram of the protective cover, telescopic airbag, and trigger plate provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the trigger disk, elastic latch key, and ring groove structure provided by an embodiment of the present invention.

[0019] Description of reference numerals: 1. Gravimeter body; 11. Fixing seat; 12. Connecting seat; 13. Pendulum; 14. Zero-length spring; 15. Upper lever; 16. Lower lever; 17. Assembly plate; 18. Weighing block; 19. Pressure screw; 2. Reading knob; 21. Reduction gear set; 3. Protective cover; 31. Telescopic airbag; 33. Trigger plate; 34. Elastic member; 35. Stopper; 36. Slot; 361. Horizontal slot; 3 62. Inclined groove; 363. One-way lever; 364. Vertical groove; 37. Elastic key; 38. Bump; 4. Upper pressure plate; 41. Lower pressure plate; 5. Trigger lever; 51. Slider; 52. Push plate; 53. Tension spring; 54. Transmission rod; 55. Slide rail; 6. Rotating rod; 61. Counterweight; 62. Balance torsion spring; 63. Expansion bladder; 64. Air cavity; 65. Card sleeve; 66. Inner bladder; 67. Connecting tube. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figures 1-10 As shown, the gravimeter body 1 and the reading knob 2 rotatably arranged thereon, and the gravimeter body 1 also rotatably arranges a pendulum rod 13 and a zero-length spring 14 for keeping the pendulum rod 13 in a horizontal state, including a trigger unit in the gravimeter body 1 for detecting the stable state of the gravimeter body 1, including a trigger rod 5 rotatably arranged on the inner wall of the gravimeter body 1 and tilted under weightlessness; An upper pressing plate 4 and a lower pressing plate 41 are arranged to slide in the vertical direction, and the upper pressing plate 4 and the lower pressing plate 41 tilt with the trigger rod 5 to lock the swing rod 13; A rotating rod 6 is rotatably disposed in the gravimeter body 1 , on which an inner capsule 66 coaxial with the zero-length spring 14 is disposed, and further comprising a balancing torsion spring 62 for making the rotating rod 6 parallel to the zero-length spring 14 ; The connecting tube 67 is fixedly arranged on the inner bag 66 and is used to expand the inner bag 66 when the trigger rod 5 is in a tilted state, so as to limit the zero-length spring 14.

[0022] Specifically, such as Figure 2 and Figure 3As shown, the gravimeter also includes a lower lever 16 and an upper lever 15, each rotatably connected to the gravimeter body 1 via a rotating shaft. The upper lever 15 and the lower lever 16 are hingedly connected via a vertical plate. The gravimeter also includes a pressure screw 19, which is rotatably disposed within the gravimeter body 1. The output end of the reading knob 2 is provided with a reduction gear set 21, which is in transmission with the pressure screw 19. The reduction gear set 21 is used to slow down the rotation speed of the reading knob 2 and transmit it to the pressure screw 19, thereby refining the rotation angle of the pressure screw 19. The pressure screw 19 is threadedly connected to the gravimeter body 1. The reduction gear set 21 drives the pressure screw 19 to extend downward as it rotates. The first end of the zero-length spring 14 is fixedly connected to the upper lever 15, and the second end is fixedly connected to the rocker arm 13. The rocker arm 13 is fixedly provided with a weighing block 18.

[0023] The operating principle of a gravimeter is as follows: According to Hooke's law (F=kx) and the gravity formula (F=mg), when the spring reaches equilibrium, the deformation x satisfies mg=kx, or g=km / x. By measuring x and combining the known spring constant k and mass m, the acceleration due to gravity, g, can be calculated. Calibration is performed at a standard point with a known gravity value (such as the International Absolute Gravity Reference Station). At this standard point, the pendulum 13 is horizontal, and the readout knob 2 is at the origin. During actual gravity measurement, due to changes in gravity, the pendulum 13 is no longer horizontal. Rotating the readout knob 2 then moves the collateral screw 19 downward, causing the lower lever 16 to swing slightly downward. This, in turn, pushes the upper lever 15 upward via the hinged vertical plate, causing it to swing upward and stretch the zero-length spring 14. The tension of the zero-length spring 14 restores the pendulum 13 to its horizontal position. The electronic components involved are well known to those skilled in the art and will not be described in detail here.

[0024] Furthermore, the inner capsule 66 is located at the axis of the zero-length spring 14 and does not contact the zero-length spring 14 in the default state. The torsion of the balancing torsion spring 62 balances the gravity of the inner capsule 66 and the rotating rod 6, so that the rotating rod 6 is always parallel to the zero-length spring 14.

[0025] Furthermore, the trigger lever 5 remains as Figure 4 and Figure 6 The trigger lever 5 is in the vertical position shown. At this point, the rotating shaft of the trigger lever 5 is located at the geometric center of its gravity, the line of action of gravity passes through the rotating shaft, and the torque is zero, placing the trigger lever 5 in a balanced state. An infrared detection device or a rotation speed detection device can be provided to monitor the trigger lever 5 in real time. When the gravimeter body 1 is impacted, the force generated by the impact causes the trigger lever 5 to shake, thereby triggering the infrared detection device or the rotation speed detection device to send a signal.

[0026] The signal can be received by an electric telescopic rod, so that the electric telescopic rod is fixedly arranged in the gravimeter body 1 and there are two of them, and the output ends are fixedly connected to the upper pressure plate 4 and the lower pressure plate 41 respectively, and the rocker arm 13 is located between the upper pressure plate 4 and the lower pressure plate 41. The electric telescopic rod drives the upper pressure plate 4 and the lower pressure plate 41 to approach each other and lock the rocker arm 13; or the signal can be received by a linear motor, through two linear motors arranged in the vertical direction on the inner wall of the gravimeter body 1, and fixedly connected to the upper pressure plate 4 or the lower pressure plate 41 respectively, the linear motor drives the upper pressure plate 4 or the lower pressure plate 41 to approach each other and lock the rocker arm 13, or other driving methods known to those skilled in the art are also possible.

[0027] In addition, it also includes an inflation unit such as a fan connected to the connecting tube 67. After the infrared detection device or the speed detection device detects that the trigger rod 5 is tilted, air is supplied to the connecting tube 67 through the inflation unit, so that the inner bag 66 expands and supports the inner circle of the zero-length spring 14 from the inside. The supporting effect of the inner bag 66 makes it difficult for the zero-length spring 14 to produce bending deformation on the axial diameter due to violent shaking, which can avoid physical fatigue of the zero-length spring 14 caused by shaking and extend the service life of the device.

[0028] In the above technology, when the gravimeter body 1 is impacted, the force generated by the collision causes the trigger rod 5 to shake, thereby driving the upper and lower pressure plates 4, 41 closer together and locking the rocker arm 13, preventing damage to the rocker arm 13. Furthermore, the inner capsule 66 expands and supports the inner coil of the zero-length spring 14 from within. The support provided by the inner capsule 66 makes it less likely that the zero-length spring 14 will bend along its axis due to severe shaking, thus preventing physical fatigue of the zero-length spring 14 due to shaking and extending the service life of the device.

[0029] As another embodiment provided by the present invention, it further includes a tension spring 53 provided on the trigger rod 5 to keep the trigger rod 5 in a vertical state, and a heavy hammer is provided on the top of the trigger rod 5.

[0030] Specifically, two push plates 52 are fixedly provided on the trigger rod 5, an assembly plate 17 is fixedly provided in the gravimeter body 1, an upper pressing plate 4 and a lower pressing plate 41 are slidably provided on the assembly plate 17 and are respectively located on the upper and lower sides of the rocker 13, the upper pressing plate 4 and the lower pressing plate 41 are located between the two push plates 52, and a blocking spring is provided between the upper pressing plate 4 and the lower pressing plate 41, as shown in FIG. Figure 2 and Figure 3 The setting of the weight increases the rotational force generated by the trigger lever 5 when tilted. Since the rotation axis of the trigger lever 5 is located between the two push plates 52, when the trigger lever 5 is tilted, the two push plates 52 rotate, with the upper push plate 52 rotating downward and pressing the upper pressure plate 4, while the lower push plate 52 rotates upward and pressing the lower pressure plate 41. The upper and lower pressure plates 4 and 41 overcome the elastic resistance of the blocking spring, approach each other, and lock the rocker arm 13, as shown in FIG. Figure 5The status toggle shown.

[0031] As another embodiment provided by the present invention, it also includes a fixing base 11 fixedly arranged in the gravimeter body 1, on which a connecting base 12 for connecting the tension spring 53 is provided, and the center of gravity of the trigger rod 5 in the vertical state is coaxial with the tension spring 53.

[0032] Specifically, such as Figure 6 In the state shown, the first end of the tension spring 53 pulls the weight, and the second end is connected to the connecting base 12. In the vertical state, the force of the tension spring 53 is directed vertically downward and passes through the rotating shaft, so its torque is zero. At the same time, the center of gravity of the trigger rod 5 is coaxial with the tension of the tension spring 53, resulting in the gravity torque being zero. The bottom end of the trigger rod 5 is against the fixed base 11, and the upward force of the fixed base 11 and the tension of the tension spring 53 are balanced, so that the total torque of the system is balanced, thereby maintaining the vertical state.

[0033] When the trigger lever 5 is impacted, the heavy hammer's significant inertia during impact or shaking causes it to swing significantly, increasing its sensitivity and further protecting the swing arm 13. The center of gravity of the trigger lever 5 deviates from the vertical orientation as it shakes. As the trigger lever 5 swings, its bottom end disengages from the mounting bracket 11, which no longer supports it. The trigger lever 5 is now primarily subject to gravity and the tension of the tension spring 53, causing it to lose weight and tilt.

[0034] As another embodiment provided by the present invention, the material of the balancing torsion spring 62 is consistent with that of the zero-length spring 14 .

[0035] Specifically, since the zero-length spring 14 is generally made of quartz or metal materials, the elastic performance of the zero-length spring 14 will change when the air pressure or temperature changes. The balancing torsion spring 62 can ensure that the elastic performance of the balancing torsion spring 62 is consistent with that of the zero-length spring 14 under the same environment, thereby avoiding the deviation of the axis of the inner capsule 66 from the zero-length spring 14 due to performance changes.

[0036] As another embodiment provided by the present invention, a counterweight block 61 is provided on the rotating rod 6 .

[0037] Specifically, the counterweight 61 simulates the weight of the pendulum 13, and the balancing torsion spring 62 has the same elastic properties as the zero-length spring 14. Therefore, when testing gravity, the pendulum 13 deflects and pulls on the zero-length spring 14, causing the axis of the zero-length spring 14 to change. The counterweight 61 also causes the rotating rod 6 to swing accordingly. The deflection of the rotating rod 6 causes the inner capsule 66 to swing coaxially with the zero-length spring 14.

[0038] As an embodiment provided by the present invention, the suspension unit includes an expansion bag 63 connected to the connecting pipe 67 and used to lock the rotating rod 6.

[0039] Specifically, it also includes a clamping sleeve 65 fixedly arranged in the gravimeter body 1, a plurality of clamping teeth are arranged in the clamping sleeve 65, and an air cavity 64 connected to the connecting pipe 67 is arranged at the rotating shaft of the rotating rod 6. Figure 8 As shown, the air cavity 64 is in communication with both the expansion bladder 63 and the inner bladder 66. In normal use, since the trigger rod 5 remains in a balanced state and does not tilt, the inflation unit does not supply air to the connecting tube 67. At this time, the expansion bladder 63 also does not supply air. The expansion bladder 63 is in a contracted state, and the expansion bladder 63 and the latch teeth are staggered and do not interfere with each other.

[0040] However, after the trigger rod 5 loses weight and tilts, the inflation unit feeds air into the connecting tube 67, and the connecting tube 67 passes the gas into the air cavity 64, causing the expansion bag 63 to expand radially and collide with the latch teeth. The friction resistance between the expansion bag 63 and the latch teeth acts as a damping force, thereby locking the rotating rod 6 at the current angle, preventing the rotating rod 6 from swinging and contacting the zero-length spring 14 during a collision, and preventing the zero-length spring 14 from exerting excessive pulling force on both ends when swinging.

[0041] As another embodiment provided by the present invention, it also includes a protective cover 3 movably arranged on the gravimeter body 1 and used to limit the reading knob 2, and a telescopic airbag 31 is rotatably arranged on the protective cover for maintaining a predetermined height.

[0042] Specifically, the protective cover 3 is arranged to rotate and slide relative to the gravimeter body 1, the top of the telescopic airbag 31 is fixedly connected to the top side of the inner wall of the gravimeter body 1, and a plurality of elastic members 34 are arranged in the telescopic airbag 31, and the two ends of the elastic member 34 are respectively fixedly connected to the top side of the inner wall of the gravimeter body 1 and the bottom side of the inner wall of the telescopic airbag 31. The elastic member 34 is in a contracted state in the default state, so that the telescopic airbag 31 is folded and tightly attached to the top side of the inner wall of the gravimeter body 1. At this time, the telescopic airbag 31 drives the protective cover 3 to extend out of the gravimeter body 1. This is the default height of the protective cover 3. A plurality of stoppers 35 are fixedly arranged on the protective cover 3, such as Figure 9 As shown, the stopper 35 is made of flexible, non-slip rubber and limits the rotation of the reading knob 2. To rotate the reading knob 2, the protective cover 3 is pressed downward, causing the elastic member 34 to be stretched and charged. The telescopic airbag 31 then expands and no longer adheres to the inner wall of the gravimeter body 1. After the protective cover 3 is pressed downward until it is offset from the reading knob 2, the reading knob 2 can be rotated, effectively preventing accidental contact.

[0043] As another embodiment provided by the present invention, it also includes a trigger disk 33 that is rotatably arranged in the gravimeter body 1 and keeps synchronous movement with the trigger rod 5, and a plurality of elastic latch keys 37 for latching the protective cover 3 are arranged in a circular array on the upper circumference, and a protrusion 38 is provided on the elastic latch key 37.

[0044] Specifically, a slide groove is provided in the trigger plate 33, a slider 51 is fixedly provided on the trigger rod 5, and a transmission rod 54 is slidably provided in the gravimeter body 1, and a slide rail 55 is provided at the bottom end of the transmission rod 54 for slidingly cooperating with the slider 51, and the top end of the transmission rod 54 is slidably provided in the slide groove, as shown in FIG. Figure 9 As shown, when the trigger lever 5 is tilted, the slider 51 deflects, and the slide rail 55 is pressed downward by the slider 51, thereby driving the transmission rod 54 to press the slide groove, causing the trigger plate 33 to rotate, and driving the multiple elastic latches 37 fixed on the outer wall of the trigger plate 33 to rotate synchronously, achieving synchronous movement between the trigger lever 5 and the trigger plate 33, providing the necessary premise for subsequent embodiments.

[0045] As another embodiment provided by the present invention, the protective cover 3 is provided with a plurality of slots 36 and annular grooves that slide with the protrusions 38; The annular groove is used to introduce the elastic latch 37 into or out of the latch groove 36 .

[0046] Specifically, the structure of the ring groove is as follows Figure 9 and Figure 10 As shown, it includes a horizontal slot 361, a vertical slot 364 and an oblique slot 362 connected in series, wherein a one-way lever 363 is provided between the vertical slot 364 and the oblique slot 362 so that the protrusion 38 can only slide downward at the intersection of the vertical slot 364 and the oblique slot 362. When the reading knob 2 is rotated, the elastic latch 37 is located in the latch slot 36, and the protrusion 38 is located at the intersection of the horizontal slot 361 and the oblique slot 362, that is, Figure 10 When the protective cover 3 needs to be restored to a predetermined height, the protective cover 3 is manually rotated so that the elastic latch 37 slides out of the latch slot 36. At this time, the protrusion 38 slides from position A to position B. Since the protective cover 3 tends to move upward, the protrusion 38 no longer blocks the protective cover 3 in position B, allowing the protective cover 3 to move upward. The protrusion 38 moves from position B to position C.

[0047] When the reading knob 2 needs to be rotated again, the protective cover 3 is pressed down and rotated slightly at the same time, so that the protrusion 38 slides upward along the inclined groove 362 from position C to position A, and the elastic latch 37 enters the latch groove 36 and is locked.

[0048] During a reading, if the gravimeter body 1 is impacted, the trigger lever 5 swings, causing the trigger disk 33 to rotate, which in turn drives the multiple elastic latches 37 to rotate synchronously. At this point, the protrusion 38 of the elastic latch 37 moves from position A to position B, and the protective cover 3 begins to move upward. Once in position B, the protrusion 38 no longer blocks the protective cover 3, allowing it to move upward and drive the stopper 35 to lock the reading knob 2. The friction of the stopper 35 presses against the side wall of the reading knob 2, retaining the current reading.

[0049] When the reading knob 2 needs to be rotated again, the protective cover 3 is pressed down. Since the trigger disk 33 has been rotated under the pressure of the transmission rod 54, the inclined groove 362 will guide the protrusion 38 along position C to position A during the downward movement, so that the trigger disk 33 rotates in the opposite direction to the initial state, and the transmission rod 54 is driven to slide upward through the rotation of the slide groove, and the trigger rod 5 is driven to restore the vertical state again. The bottom end of the trigger rod 5 is against the fixed seat 11, and the distance between the upper pressure plate 4 and the lower pressure plate 41 is maintained by the resistance spring and the rocker arm 13 is released.

[0050] As another embodiment provided by the present invention, the telescopic airbag 31 is communicated with the connecting pipe 67 .

[0051] Specifically, multiple elastic members 34 are disposed within the telescopic airbag 31. By default, the elastic members 34 are in a contracted state, causing the telescopic airbag 31 to fold and cling tightly to the top inner wall of the gravimeter body 1. At this point, the gas within the telescopic airbag 31 enters the inner bladder 66 and the expansion bladder 63 through the connecting tube 67. When the reading knob 2 needs to be rotated, the protective cover 3 is pressed downward, causing the elastic members 34 to be stretched and charged. The telescopic airbag 31 then expands and no longer clings tightly to the inner wall of the gravimeter body 1. The telescopic airbag 31 then draws suction from the inner bladder 66 and the expansion bladder 63, causing them to contract.

[0052] Working principle: When the reading knob 2 needs to be rotated, press the protective cover 3 downwards, so that the elastic member 34 is in a stretched and force-storing state, the telescopic airbag 31 is unfolded and no longer close to the inner wall of the gravimeter body 1, and after pressing the protective cover 3 down until it is offset from the reading knob 2, the reading knob 2 can be rotated.

[0053] At this time, the elastic latch 37 is located in the latch groove 36, and the protrusion 38 is located at the junction of the horizontal groove 361 and the oblique groove 362. Figure 10 The A position shown in .

[0054] When the gravimeter body 1 is impacted, the heavy hammer experiences significant inertia during impact or shaking, causing the trigger lever 5 to swing significantly. This increases the trigger lever 5's sensitivity and further enhances the protection of the pendulum 13. The center of gravity of the trigger lever 5 deviates from the vertical orientation as it shakes. As the trigger lever 5 swings, its bottom end disengages from the mounting 11, which no longer supports it. The trigger lever 5 is now primarily subject to gravity and the tension of the tension spring 53, causing it to lose weight and tilt.

[0055] Since the rotating shaft of the trigger rod 5 is located between the two push plates 52, when the trigger rod 5 is tilted, the two push plates 52 rotate, wherein the push plate 52 located on the upper side rotates downward and squeezes the upper pressure plate 4, and the push plate 52 located on the lower side rotates upward and squeezes the lower pressure plate 41, and the upper pressure plate 4 and the lower pressure plate 41 approach each other and lock the rocker arm 13.

[0056] When the trigger rod 5 is tilted, the slider 51 deflects, and the slide rail 55 slides downward due to the pressure of the slider 51, thereby driving the transmission rod 54 to press the slide groove, causing the trigger disk 33 to rotate and driving multiple elastic keys 37 to rotate synchronously. At this time, the protrusion 38 of the elastic key 37 reaches position B along position A, and the protective cover 3 has a tendency to move upward. After the protrusion 38 is in position B, it no longer blocks the protective cover 3, causing the protective cover 3 to move upward and drive the block 35 to lock the reading knob 2. The friction force of the block 35 presses the side wall of the reading knob 2 to retain the current reading.

[0057] The telescopic airbag 31 is folded and pressed against the top side of the inner wall of the gravimeter body 1. At this time, the gas in the telescopic airbag 31 enters the inner bag 66 and the expansion bag 63 through the connecting tube 67. The friction resistance between the expansion bag 63 and the latching teeth plays a damping role, thereby locking the rotating rod 6 at the current angle to prevent the rotating rod 6 from swinging and contacting the zero-length spring 14 during a collision. The inner bag 66 expands and supports the inner ring of the zero-length spring 14 from the inside. The supporting effect of the inner bag 66 makes it difficult for the zero-length spring 14 to produce bending deformation on the shaft diameter due to violent shaking.

[0058] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A spring-type gravimeter automatic pendulum locking device, comprising a gravimeter body (1) and a reading knob (2) rotatably arranged thereon, and a pendulum rod (13) and a zero-length spring (14) for keeping the pendulum rod (13) in a horizontal state are also rotatably arranged in the gravimeter body (1), characterized in that: It includes a trigger unit in the gravimeter body (1) for detecting the stable state of the gravimeter body (1), including a trigger rod (5) rotatably arranged on the inner wall of the gravimeter body (1) and tilted under weightlessness; An upper pressing plate (4) and a lower pressing plate (41) are arranged to slide in a vertical direction, and the upper pressing plate (4) and the lower pressing plate (41) tilt with the trigger rod (5) to lock the swing rod (13); A rotating rod (6) is rotatably disposed in a gravimeter body (1), wherein an inner capsule (66) coaxial with the zero-length spring (14) is disposed on the rotating rod, and a balancing torsion spring (62) is further included for making the rotating rod (6) parallel to the zero-length spring (14); A connecting tube (67) fixedly arranged on the inner capsule (66) is used to expand the inner capsule (66) when the trigger rod (5) is in a tilted state to limit the zero-length spring (14).

2. The automatic pendulum locking device of a spring-type gravimeter according to claim 1, characterized in that: It also includes a tension spring (53) arranged on the trigger rod (6) to keep the trigger rod (6) in a vertical state, and a heavy hammer is arranged at the top end of the trigger rod (6).

3. The automatic pendulum locking device of a spring-type gravimeter according to claim 2, characterized in that: It also includes a fixing seat (11) fixedly arranged in the gravimeter body (1), on which a connecting seat (12) for connecting a tension spring (53) is arranged, and the center of gravity of the trigger rod (5) in the vertical state is coaxial with the tension spring (53).

4. The automatic pendulum locking device of a spring-type gravimeter according to claim 1, characterized in that: The material of the balancing torsion spring (62) is consistent with that of the zero-length spring (14).

5. The automatic pendulum locking device of a spring-type gravimeter according to claim 1, characterized in that: A counterweight (61) is provided on the rotating rod (6).

6. The automatic pendulum locking device of a spring-type gravimeter according to claim 1, characterized in that: The rotating rod (6) includes an expansion bag (63) that is in communication with the connecting pipe (67) and is used to lock the rotating rod (6).

7. The automatic pendulum locking device of a spring-type gravimeter according to claim 1, characterized in that: It also includes a protective cover (3) movably arranged on the gravimeter body (1) and used to limit the reading knob (2), and a telescopic airbag (31) is rotatably arranged on the protective cover for maintaining a predetermined height.

8. The automatic pendulum locking device of a spring-type gravimeter according to claim 7, characterized in that: It also includes a trigger disk (33) that is rotatably disposed in the gravimeter body (1) and keeps synchronous movement with the trigger rod (5), and a plurality of elastic latch keys (37) for latching the protective cover (3) are arranged in a circumferential array on the trigger disk, and a protrusion (38) is provided on the elastic latch keys (37).

9. The automatic pendulum locking device of a spring-type gravimeter according to claim 8, characterized in that: The protective sleeve (3) is provided with a plurality of slots (36) and annular grooves that slide in cooperation with the protrusions (38); The annular groove is used to introduce the elastic latch key (37) into or out of the latch groove (36).

10. The automatic pendulum locking device of a spring-type gravimeter according to claim 7, characterized in that: The telescopic airbag (31) is in communication with the connecting pipe (67).

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