A differential thread overload protection device and pressure testing device

Abstract

The present application relates to the technical fields of force sensor, especially to a differential thread overload protection device and a pressure testing device, the present application realizes overload protection through cooperation of the first threaded part, the intermediate threaded part and the second threaded part, the first threaded part is connected with the intermediate threaded part through the first threaded pair, the second threaded part is connected with the intermediate threaded part through the second threaded pair, the first threaded pair and the second threaded pair are different in thread pitch, the thread directions are same, when the amplitude needs to be adjusted, the second threaded part and the first threaded part are fixed, only the intermediate threaded part is rotated, the intermediate threaded part changes positions relative to the first threaded part and the second threaded part, the fine adjustment of the amplitude of overload protection is realized, and the required space is reduced.

Description

Technical Field

[0001] This invention relates to the field of force sensor technology, and in particular to a differential thread overload protection device and a pressure testing device. Background Technology

[0002] Force sensors can be overloaded and damaged when subjected to excessive force during use. Therefore, a force sensor protection structure is needed to protect the force sensor. Existing force sensor protection structures are generally in the form of "elastic element + limiting post". There are generally two arrangements: one is a series connection, in which the elastic element is placed in the direction of force measurement and connected to the force sensor. When the applied force is about to exceed the maximum range of the force sensor, the limiting post stops the applied element, thereby protecting the force sensor. The other is a parallel connection, in which the load is applied to the free end of the cantilever beam structure, the limiting post is located at the rear of the cantilever beam structure, and the elastic element is placed between the force sensor and the limiting post. When the applied force is about to exceed the maximum range of the force sensor, the limiting post stops the applied element, thereby protecting the force sensor.

[0003] Force sensors measure the magnitude of force by detecting minute deformations caused by applied force. The force sensor is connected to an elastic element, which is subjected to the same force as the force sensor. The elastic element can convert the applied force into its own deformation. When the applied force is the same, the deformation of the elastic element is much greater than that of the force sensor. This allows for precise adjustment of the applied force range by observing the deformation of the elastic element, thereby increasing the force resolution and facilitating the adjustment of the limit post to the maximum range position of the force sensor.

[0004] However, elastic elements have low stiffness and large deformation under force. In order to enable the force sensor to reach its maximum range, a long elastic element is generally required, which will occupy a lot of space. Summary of the Invention

[0005] This invention provides a differential thread overload protection device to solve the problem that existing force sensor protection structures require a large amount of space.

[0006] The present invention also provides a pressure testing device to solve the problem that existing pressure testing devices require a large amount of space to achieve the protection of force sensors.

[0007] A differential thread overload protection device includes a base and a loading element for transmitting force to a force sensor, and also includes an adjustable stop structure. The adjustable stop structure includes a first threaded component, an intermediate threaded component, and a second threaded component arranged coaxially. Both the first and second threaded components are equipped with anti-rotation structures to keep them circumferentially fixed to the base. The first threaded component is connected to the intermediate threaded component through a first threaded pair, and the second threaded component is connected to the intermediate threaded component through a second threaded pair. The first threaded component is used to stop the loading element from continuing to apply force to the force sensor when the force sensor is subjected to the maximum load. The first threaded pair and the second threaded pair have a pitch difference, and by setting the direction of rotation, the upper and lower threaded components on both sides move in the same axial direction relative to the intermediate threaded component when the intermediate threaded component is rotated, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0008] Beneficial Effects: This invention improves upon existing technology by achieving overload protection through the cooperation of a first threaded component, an intermediate threaded component, and a second threaded component. The first threaded component is connected to the intermediate threaded component via a first threaded pair, and the second threaded component is connected to the intermediate threaded component via a second threaded pair. The first threaded component is used to stop the load-bearing element when the force sensor is subjected to maximum load. Both the first and second threaded components are equipped with anti-rotation structures. When it is necessary to adjust the overload protection amplitude, the anti-rotation structure comes into play. The first and second threaded components are circumferentially fixed relative to the base, while only the intermediate threaded component can rotate. By setting the direction of rotation, the first and second threaded components move in the same direction in the axial direction. Due to the pitch difference between the first and second threaded pairs, there is a difference in the axial displacement of the first and second threaded components relative to the intermediate threaded component, thereby enabling fine-tuning of the axial length of the adjustable stop structure, i.e., fine-tuning of the overload protection amplitude. This allows the force sensor to reach its maximum range. Since the first and second threaded components move in the same direction relative to the intermediate threaded component, the space required to adjust the overload protection amplitude is also reduced accordingly.

[0009] Furthermore, the adjustable stop structure is a ring-shaped structure, with a clearance hole in the middle of the first threaded part for the application element to pass through. The end of the application element that passes through the first threaded part is used to apply force to the force sensor, and the first threaded part stops the application element through the edge of the clearance hole.

[0010] Beneficial effects: The adjustable stop structure is fitted on the outside of the loading element. The first threaded part stops the loading element through the edge of the clearance hole, making the structure between the adjustable stop structure and the loading element compact, saving space, while ensuring the stopping effect in the circumferential direction.

[0011] In addition, the second threaded part is fixedly connected to the base, and the adjustable stop structure has a space for accommodating the force sensor.

[0012] Beneficial effects: The second threaded component is fixedly connected to the base, and a receiving space for installing the force sensor is provided between the second threaded component and the base, making the structure between the force sensor and the adjustable stop structure compact and saving space.

[0013] Furthermore, the first threaded component is located radially inside the intermediate threaded component, and the second threaded component is located radially outside the intermediate threaded component.

[0014] Beneficial effects: The first threaded part, the intermediate threaded part, and the second threaded part form a structure that is smaller at the top and larger at the bottom. The force sensor is set inside the second threaded part, which makes the structure compact and saves space.

[0015] In addition, the first threaded component and the second threaded component are respectively located on the inner and outer radial sides of the intermediate threaded component.

[0016] Beneficial effects: The first and second threaded parts are respectively set on the radial inner and outer sides of the middle threaded part through threaded pairs, making the axial structure of the adjustable stop structure more compact and reducing the space occupied by the adjustable stop structure.

[0017] In addition, a transmission gear is coaxially mounted on the intermediate threaded part, and the transmission gear meshes with a drive gear that transmits rotational driving force. The number of teeth on the transmission gear is greater than the number of teeth on the drive gear.

[0018] Beneficial effects: Adjusting the intermediate threaded part via gear transmission is more labor-saving, and the number of teeth on the transmission gear is greater than that on the drive gear, allowing for more precise adjustment of the overload protection amplitude.

[0019] Furthermore, the number of teeth on the transmission gear and the drive gear are coprime.

[0020] Beneficial effects: The drive gear has a small number of teeth, a high rotation speed, and wears out quickly. The fact that the number of teeth of the transmission gear and the drive gear are prime numbers can effectively reduce gear wear.

[0021] Furthermore, the drive gear is connected to a drive motor, and the drive motor is connected to a controller.

[0022] Beneficial effects: The drive gear is controlled by the controller, which can achieve precise adjustment of the overload protection amplitude and reduce the workload of the staff.

[0023] Furthermore, the transmission gear and the intermediate threaded component are detachably connected.

[0024] Beneficial effects: The transmission gear and the intermediate threaded part can be detachably connected. When the gear is worn or malfunctions, only the transmission gear needs to be replaced, which is simple and economical. At the same time, it is easy to adjust the transmission ratio between the transmission gear and the drive gear.

[0025] A pressure testing device includes a force sensor and a differential thread overload protection device. The differential thread overload protection device includes a base and a loading element for transmitting force to the force sensor, and also includes an adjustable stop structure. The adjustable stop structure includes a first threaded component, an intermediate threaded component, and a second threaded component arranged coaxially. Both the first and second threaded components are equipped with anti-rotation structures to keep them circumferentially fixed to the base. The first threaded component is connected to the intermediate threaded component through a first threaded pair, and the second threaded component is connected to the intermediate threaded component through a second threaded pair. The first threaded component is used to stop the loading element from continuing to apply force to the force sensor when the force sensor is subjected to the maximum bearing force. The first threaded pair and the second threaded pair have a pitch difference, and by setting the direction of rotation, when the intermediate threaded component is rotated, the upper and lower threaded components move in the same axial direction relative to the intermediate threaded component, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0026] Beneficial Effects: This invention improves upon existing technology by achieving overload protection through the cooperation of a first threaded component, an intermediate threaded component, and a second threaded component. The first threaded component is connected to the intermediate threaded component via a first threaded pair, and the second threaded component is connected to the intermediate threaded component via a second threaded pair. The first threaded component is used to stop the load-bearing element when the force sensor is subjected to maximum load. Both the first and second threaded components are equipped with anti-rotation structures. When the overload protection amplitude needs to be adjusted, the anti-rotation structure is activated. The first and second threaded components are circumferentially fixed relative to the base, while only the intermediate threaded component can rotate. By rotating the intermediate threaded component and setting the rotation direction, the first and second threaded components move axially in the same direction relative to the intermediate threaded component. Due to the pitch difference between the first and second threaded pairs, there is a difference in the axial displacement of the first and second threaded components relative to the intermediate threaded component, thereby achieving fine-tuning of the axial length of the adjustable stop structure, i.e., fine-tuning the overload protection amplitude. This allows the force sensor to reach its maximum range. Since the first and second threaded components move in the same direction relative to the intermediate threaded component, the space required to adjust the overload protection amplitude is also reduced accordingly.

[0027] Furthermore, the adjustable stop structure is a ring-shaped structure, with a clearance hole in the middle of the first threaded part for the application element to pass through. The end of the application element that passes through the first threaded part is used to apply force to the force sensor, and the first threaded part stops the application element through the edge of the clearance hole.

[0028] Beneficial effects: The adjustable stop structure is fitted on the outside of the application element. The first threaded part stops the application element through the edge of the clearance hole, making the structure between the adjustable stop structure and the application element compact, saving space, while ensuring the stopping effect.

[0029] In addition, the second threaded part is fixedly connected to the base, and the adjustable stop structure has a space for accommodating the force sensor.

[0030] Beneficial effects: The second threaded component is fixedly connected to the base, and a receiving space for installing the force sensor is provided between the second threaded component and the base, making the structure between the force sensor and the adjustable stop structure compact and saving space.

[0031] Furthermore, the first threaded component is located radially inside the intermediate threaded component, and the second threaded component is located radially outside the intermediate threaded component.

[0032] Beneficial effects: The first threaded part, the intermediate threaded part, and the second threaded part form a structure that is smaller at the top and larger at the bottom. The force sensor is set inside the second threaded part, which makes the structure compact and saves space.

[0033] In addition, the first threaded component and the second threaded component are respectively located on the inner and outer radial sides of the intermediate threaded component.

[0034] Beneficial effects: The first and second threaded parts are respectively set on the radial inner and outer sides of the middle threaded part through threaded pairs, making the axial structure of the adjustable stop structure more compact and reducing the space occupied by the adjustable stop structure.

[0035] In addition, the intermediate threaded part is externally connected to a transmission gear for auxiliary adjustment of the intermediate threaded part. The transmission gear is connected to a drive gear for auxiliary adjustment of the transmission gear through a gear pair. The number of teeth of the transmission gear is greater than the number of teeth of the drive gear.

[0036] Beneficial effects: Adjusting the intermediate threaded part via gear transmission is more labor-saving, and the number of teeth on the transmission gear is greater than that on the drive gear, allowing for more precise adjustment of the overload protection amplitude.

[0037] Furthermore, the number of teeth on the transmission gear and the drive gear are coprime.

[0038] Beneficial effects: The drive gear has a small number of teeth, a high rotation speed, and wears out quickly. The fact that the number of teeth of the transmission gear and the drive gear are prime numbers can effectively reduce gear wear.

[0039] Furthermore, the drive gear is connected to a drive motor, and the drive motor is connected to a controller.

[0040] Beneficial effects: The drive gear is controlled by the controller, which can achieve precise adjustment of the overload protection amplitude and reduce the workload of the staff.

[0041] Furthermore, the transmission gear and the intermediate threaded component are detachably connected.

[0042] Beneficial effects: The transmission gear and the intermediate threaded part can be detachably connected. When the gear is worn or malfunctions, only the transmission gear needs to be replaced, which is simple and economical. At the same time, it is easy to adjust the transmission ratio between the transmission gear and the drive gear. Attached Figure Description

[0043] Figure 1 This is an overall assembly diagram of Embodiment 1 of the pressure testing device of the present invention;

[0044] Figure 2 This is a schematic diagram of the differential thread in Embodiment 1 of the pressure testing device of the present invention;

[0045] Figure 3 This is a front view of Embodiment 6 of the pressure testing device of the present invention;

[0046] Figure 4 This is a top view of Embodiment 5 of the pressure testing device of the present invention.

[0047] Figure 1 In the middle: 1. Base; 2. Force sensor; 3. Motor mounting base; 4. Drive motor; 5. Drive gear; 6. Loading element; 7. First threaded component; 8. Intermediate threaded component; 9. Transmission gear; 10. Second threaded component; Figure 2 In the middle: 11. Second threaded pair; 12. First threaded pair; 13. Pin; Figure 4 In the middle: 14, pin hole; 15, dial; 16, gear pair. Detailed Implementation

[0048] The overall concept and technical principles of this invention are described below.

[0049] A pressure testing device includes a force sensor and a differential thread overload protection device. The differential thread overload protection device includes a loading element for transmitting force to the force sensor, a base, and an adjustable stopping structure for stopping the loading element. The adjustable stopping structure includes a first threaded component, a second threaded component, and an intermediate threaded component arranged coaxially. The first threaded component is connected to the intermediate threaded component via a first threaded pair, and the second threaded component is connected to the intermediate threaded component via a second threaded pair. The first threaded component is used to stop the loading element when the force sensor is subjected to maximum load, preventing the loading element from continuing to apply force to the force sensor. Simultaneously, both the first and second threaded components are equipped with anti-rotation structures to circumferentially fix the first and second threaded components relative to the base. The key improvement of this invention lies in the fact that the first threaded pair and the second threaded pair are set with a certain relationship in their rotation direction. When the first threaded part and the second threaded part are fixed circumferentially, rotating the intermediate threaded part can make the first threaded pair and the second threaded pair move in the same axial direction relative to the intermediate threaded part. In addition, there is a pitch difference between the first threaded pair and the second threaded pair, that is, the axial displacement of the first threaded part and the second threaded part relative to the intermediate threaded part is not equal, so that the moving distance of the first threaded part and the second threaded part is different, thereby achieving fine adjustment of the adjustable stop structure in the axial length.

[0050] In using this invention, first determine the rated maximum range of the force sensor and the required overload protection amplitude. Activate the anti-rotation structure to fix the first and second threaded components circumferentially relative to the base. Then, rotate the intermediate threaded component for adjustment. The first and second threaded pairs have a specific rotation direction. The first and second threaded components move in the same axial direction relative to the intermediate threaded component. There is a pitch difference between the first and second threaded pairs, and their axial displacements relative to the intermediate threaded component are unequal. This allows for fine-tuning of the adjustable stop structure in the axial length, i.e., fine-tuning of the overload protection amplitude. Because the first and second threaded components move in the same direction relative to the intermediate threaded component, they occupy relatively little space. After adjusting the amplitude, install the differential thread overload protection device and the force sensor. The load-applying element applies force to the force sensor. When the force sensor is subjected to its maximum load, the first threaded component stops the load-applying element, protecting the force sensor.

[0051] Embodiment 1 of the pressure measuring device of the present invention:

[0052] A pressure measuring device, such as Figure 1 As shown, the device includes a force sensor 2 and a differential thread overload protection device. The differential thread overload protection device includes a base 1, a load-applying element 6 for transmitting force to the force sensor 2, and an adjustable stop structure. The adjustable stop structure includes a first threaded component 7, an intermediate threaded component 8, and a second threaded component 10 arranged coaxially. Both the first threaded component 7 and the second threaded component 10 are equipped with anti-rotation structures to keep them circumferentially fixed to the base 1. Figure 2 As shown, the first threaded component 7 is connected to the intermediate threaded component 8 through the first threaded pair 12, and the second threaded component 10 is connected to the intermediate threaded component 8 through the second threaded pair 11. The first threaded component 7 is used to stop the load-applying element 6 from continuing to apply force to the force sensor 2 when the force sensor 2 is subjected to the maximum bearing force. The first threaded pair 11 and the second threaded pair 12 have a pitch difference and are set with a certain relationship in the direction of rotation so that when the intermediate threaded component 8 is rotated, the threaded components on the upper and lower sides move in the same direction in the axial direction relative to the intermediate threaded component 8, thereby realizing the fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0053] The key feature of this embodiment is that the adjustable stop structure is a ring-shaped structure. The first threaded component 7 has a clearance hole in the middle for the application element 6 to pass through. One end of the application element 6 passes through the clearance hole and applies force to the force sensor 2. The first threaded component 7 stops the application element 6 through the edge of the clearance hole. With this structure, the adjustable stop structure is fitted onto the outside of one end of the application element 6 during assembly, which simplifies the structure of the differential thread overload protection device and saves space. During use, when the force sensor is about to overload, the edge of the clearance hole in the first threaded component 7 stops the application element 6, resulting in a more uniform stopping surface and better stopping effect.

[0054] In addition, it is easy to imagine that during assembly, the adjustable stop structure can be a columnar structure and is set on the side of the load-bearing element 6. When the force sensor 2 reaches the maximum bearing force during use, the first threaded part 7 extends radially out of the stop block to stop the load-bearing element 6.

[0055] Other parts not described in this embodiment may have the same structure as those in other embodiments described herein.

[0056] Embodiment 2 of the pressure measuring device of the present invention:

[0057] A pressure testing device includes a force sensor and a differential thread overload protection device. Its structure can be shown in the figure of Embodiment 1. The differential thread overload protection device includes a base 1, a loading element 6 for transmitting force to the force sensor 2, and an adjustable stop structure. The adjustable stop structure includes a first threaded part 7, an intermediate threaded part 8, and a second threaded part 10 arranged coaxially. Both the first threaded part 7 and the second threaded part 10 are equipped with an anti-rotation structure to keep them circumferentially fixed to the base 1. The first threaded part 7 is connected to the intermediate threaded part 8 through a first threaded pair 12, and the second threaded part 10 is connected to the intermediate threaded part 8 through a second threaded pair 11. The first threaded part 7 is used to stop the loading element 6 from continuing to apply force to the force sensor 2 when the force sensor 2 is subjected to the maximum bearing force. The first threaded pair 11 and the second threaded pair 12 have a pitch difference and the same direction of rotation so that when the intermediate threaded part 8 is rotated, the upper and lower threaded parts on both sides move in the same axial direction relative to the intermediate threaded part 8, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0058] The key feature of this invention is that the second threaded component 10 is fixedly connected to the base 1 by bolts. With this structure, the second threaded component 10 is fixed relative to the base 1 at all times, and the base 1 forms an anti-rotation structure, saving space.

[0059] In addition, the adjustable stop structure has a space for installing the force sensor 2. By using this structure to install the force sensor 2 in the adjustable stop structure, the pressure measuring device can be made compact and space-saving.

[0060] The first threaded component 7 is located on the radial inner side of the middle threaded component 8, and the second threaded component 10 is located on the radial outer side of the middle threaded component 8. This structure can form a structure that is smaller at the top and larger at the bottom. The force sensor 2 is installed inside the second threaded component 10. The structure is compact and saves space.

[0061] In addition, the first threaded part 7 can be a stop-rotation structure based on the base 1. However, since the first threaded part 7 is far from the base 1, a stop-rotation structure is set near the first threaded part 7. The stop-rotation structure can be a pin 13. A corresponding pin hole 14 is opened on the upper end face of the first threaded part 7 and the parting surface of the load-applying element 6. When it is necessary to adjust the overload protection amplitude, the pin 13 is inserted into the pin hole 14 to achieve the stop-rotation of the first threaded part 7.

[0062] In addition, it is easy to imagine that corresponding protrusions and grooves are provided on the first threaded part 7 and the loading element 6 to achieve the anti-rotation of the first threaded part 7.

[0063] Other parts not described in this embodiment may have the same structure as those in other embodiments described herein.

[0064] Embodiment 3 of the pressure measuring device of the present invention:

[0065] A pressure testing device includes a force sensor and a differential thread overload protection device. Its structure can be shown in the figure of Embodiment 1. The differential thread overload protection device includes a base 1, a loading element 6 for transmitting force to the force sensor 2, and an adjustable stop structure. The adjustable stop structure includes a first threaded part 7, an intermediate threaded part 8, and a second threaded part 10 arranged coaxially. Both the first threaded part 7 and the second threaded part 10 are equipped with an anti-rotation structure to keep them circumferentially fixed to the base 1. The first threaded part 7 is connected to the intermediate threaded part 8 through a first threaded pair 12, and the second threaded part 10 is connected to the intermediate threaded part 8 through a second threaded pair 11. The first threaded part 7 is used to stop the loading element 6 from continuing to apply force to the force sensor 2 when the force sensor 2 is subjected to the maximum bearing force. The first threaded pair 11 and the second threaded pair 12 have a pitch difference and the same direction of rotation so that when the intermediate threaded part 8 is rotated, the upper and lower threaded parts on both sides move in the same axial direction relative to the intermediate threaded part 8, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0066] The key features of this invention are: Figure 4 As shown, a transmission gear 9 is coaxially mounted on the intermediate threaded component 8. The transmission gear 9 meshes with a drive gear 5 that transmits rotational driving force. Using gear transmission, the intermediate threaded component 8 can be rotated more easily and conveniently, thereby easily and conveniently adjusting the overload protection amplitude. In use, when adjusting the overload protection amplitude as needed, the anti-rotation structure comes into play. The first threaded component 7 and the second threaded component 10 are circumferentially fixed relative to the base. Rotating the drive gear 5 causes the transmission gear 9 to rotate accordingly, driving the intermediate threaded component 8 to rotate, thus adjusting the overload protection amplitude.

[0067] The number of teeth on the transmission gear 9 and the drive gear 5 can be arbitrarily selected. The number of teeth on the drive gear 5 can be less than or equal to the number of teeth on the transmission gear 9. However, to allow for more precise adjustment of the overload protection amplitude, the number of teeth on the transmission gear 9 is greater than the number of teeth on the drive gear 5. With this structure, when the drive gear 5 rotates a certain number of teeth, the transmission gear 9 rotates a corresponding number of teeth. Because the number of teeth on the transmission gear 9 is greater than the number of teeth on the drive gear 5, the rotation amount of the transmission gear 9 is less than the rotation amount of the drive gear 5. Therefore, the overload protection amplitude can be adjusted more precisely through the drive gear 5.

[0068] The number of teeth on the transmission gear 9 and the number of teeth on the drive gear can be a sum of the numbers. However, since the number of teeth on the drive gear 5 is less than the number of teeth on the transmission gear 9, the number of rotations of the drive gear 5 is relatively high when adjusting the overload protection amplitude, and the wear of the gear also increases accordingly. Preferably, the number of teeth on the drive gear 5 and the number of teeth on the transmission gear 9 are prime numbers. Using this structure can reduce the wear of the gear.

[0069] In addition, since the transmission gear 9 is coaxially connected with the intermediate threaded part 8, the intermediate threaded part 8 drives the transmission gear 9 to slide radially when it slides radially. Since the drive gear 5 is fixed, the transmission gear 9 is provided with a certain thickness.

[0070] In addition, a scale 15 is provided on the upper end face of the intermediate threaded part 8. This structure facilitates reading and recording when rotating the gear and makes it easy to reuse.

[0071] Other parts not described in this embodiment may have the same structure as those in other embodiments described herein.

[0072] Embodiment 4 of the pressure measuring device of the present invention:

[0073] A pressure testing device includes a force sensor and a differential thread overload protection device, the structure of which can be shown in the accompanying drawings of Embodiment 1. The differential thread overload protection device includes a base 1, a loading element 6 for transmitting force to the force sensor 2, and an adjustable stop structure. The adjustable stop structure includes a first threaded component 7, an intermediate threaded component 8, and a second threaded component 10 arranged coaxially. Both the first threaded component 7 and the second threaded component 10 are equipped with anti-rotation structures to keep them circumferentially fixed to the base 1. The first threaded component 7 is connected to the intermediate threaded component 8 through a first threaded pair 12, and the second threaded component 10 is connected to the intermediate threaded component 8 through a second threaded pair 11. A transmission gear 9 is coaxially mounted on the intermediate connecting component 8, and the transmission gear 9 meshes with a drive gear 5 for transmitting rotational driving force. The first threaded component 7 is used to stop the load-applying element 6 from continuing to apply force to the force sensor 2 when the force sensor 2 is subjected to the maximum bearing force. The first threaded pair 11 and the second threaded pair 12 have a pitch difference and the same direction of rotation so that when the intermediate threaded component 8 is rotated, the threaded components on the upper and lower sides move in the same direction in the axial direction relative to the intermediate threaded component 8, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0074] The key point of this embodiment is as follows: Figure 3 As shown, the drive gear 5 is connected to a drive motor 4, which in turn is connected to a controller. With this structure, when adjusting the overload protection amplitude, the required overload protection amplitude data is input to the controller. The controller calculates the required number of revolutions and then controls the drive motor 4 to rotate. The drive motor 4 controls the drive gear 5 to rotate, which in turn drives the transmission gear 9 to rotate. The intermediate threaded component 8 rotates to complete the adjustment of the overload protection amplitude, which is relatively precise and convenient.

[0075] In addition, it is easy to imagine that when adjusting the overload protection amplitude, the manual calculates the required number of revolutions based on the required overload protection amplitude, and operates the drive gear 5 according to the required number of revolutions to complete the adjustment of the overload protection amplitude.

[0076] Other parts not described in this embodiment may have the same structure as those in other embodiments described herein.

[0077] Embodiment 5 of the pressure measuring device of the present invention:

[0078] A pressure testing device includes a force sensor and a differential thread overload protection device. Its structure can be shown in the figure of Embodiment 1. The differential thread overload protection device includes a base 1, a loading element 6 for transmitting force to the force sensor 2, and an adjustable stop structure. The adjustable stop structure includes a first threaded part 7, an intermediate threaded part 8, and a second threaded part 10 arranged coaxially. Both the first threaded part 7 and the second threaded part 10 are equipped with an anti-rotation structure to keep them circumferentially fixed to the base 1. The first threaded part 7 is connected to the intermediate threaded part 8 through a first threaded pair 12, and the second threaded part 10 is connected to the intermediate threaded part 8 through a second threaded pair 11. The first threaded part 7 is used to stop the loading element 6 from continuing to apply force to the force sensor 2 when the force sensor 2 is subjected to the maximum bearing force. The first threaded pair 11 and the second threaded pair 12 have a pitch difference and the same direction of rotation so that when the intermediate threaded part 8 is rotated, the upper and lower threaded parts on both sides move in the same axial direction relative to the intermediate threaded part 8, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0079] The transmission gear 9 and the intermediate threaded part 8 can be welded together. However, when the transmission gear wears out after welding, both the transmission gear 9 and the intermediate threaded part 8 need to be replaced together. The intermediate threaded part 8 needs to be re-machined, which consumes a lot of resources. Preferably, the transmission gear 9 and the intermediate threaded part 8 can be detached. With this structure, when the transmission gear 9 wears out, only the transmission gear 9 needs to be replaced, which is more convenient. It also makes it easier to adjust the transmission ratio between the transmission gear 9 and the drive gear 5.

[0080] Other parts not described in this embodiment may have the same structure as those in other embodiments described herein.

[0081] Embodiment 6 of the pressure measuring device of the present invention:

[0082] A pressure testing device includes a force sensor and a differential thread overload protection device. Its structure can be shown in the figure of Embodiment 1. The differential thread overload protection device includes a base 1, a loading element 6 for transmitting force to the force sensor 2, and an adjustable stop structure. The adjustable stop structure includes a first threaded part 7, an intermediate threaded part 8, and a second threaded part 10 arranged coaxially. Both the first threaded part 7 and the second threaded part 10 are equipped with an anti-rotation structure to keep them circumferentially fixed to the base 1. The first threaded part 7 is connected to the intermediate threaded part 8 through a first threaded pair 12, and the second threaded part 10 is connected to the intermediate threaded part 8 through a second threaded pair 11. The first threaded part 7 is used to stop the loading element 6 from continuing to apply force to the force sensor 2 when the force sensor 2 is subjected to the maximum bearing force. The first threaded pair 11 and the second threaded pair 12 have a pitch difference and the same direction of rotation so that when the intermediate threaded part 8 is rotated, the upper and lower threaded parts on both sides move in the same axial direction relative to the intermediate threaded part 8, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0083] The first threaded part 7 and the second threaded part 10 can be located on the same radial side of the intermediate threaded part 8. However, when assembling this structure, the first threaded part 7 and the second threaded part 10 will interfere with each other and occupy a lot of space due to being located on the same side.

[0084] Therefore, preferably, the first threaded part 7 and the second threaded part 10 are respectively disposed on the radial inner and outer sides of the intermediate threaded part 8. At this time, the first threaded part 7 and the second threaded part 10 coincide with each other in the axial direction. This structure can make the components of the detachable stop structure compact and make full use of the space on the radial inner and outer sides of the intermediate threaded part 8.

[0085] Furthermore, the first threaded component 7 consists of a radial extension section and an axial extension section. The axial extension section is provided with a thread that mates with the internal thread of the intermediate threaded component 8. The intermediate threaded component 8 consists of a radial extension section and an axial extension section. The axial extension section is provided with a thread that mates with the thread of the second threaded component 10. The radial extension section of the first threaded component 7 is located above the axial extension section of the intermediate threaded component 8, and the radial extension section of the intermediate threaded component 8 is located above the second threaded component 10. With this structure, if the threaded component is subjected to excessive force and the thread fails, the second threaded component 10 can stop the intermediate threaded component 8, and the intermediate threaded component 8 can stop the first threaded component 7, thereby providing overall support for the load-bearing element.

[0086] Other parts not described in this embodiment may have the same structure as those in other embodiments described herein.

[0087] Embodiment 7 of the pressure measuring device of the present invention:

[0088] A pressure testing device includes a force sensor and a differential thread overload protection device. Its structure can be shown in the figure of Embodiment 1. The differential thread overload protection device includes a base 1, a loading element 6 for transmitting force to the force sensor 2, and an adjustable stop structure. The adjustable stop structure includes a first threaded part 7, an intermediate threaded part 8, and a second threaded part 10 arranged coaxially. Both the first threaded part 7 and the second threaded part 10 are equipped with an anti-rotation structure to keep them circumferentially fixed to the base 1. The first threaded part 7 is connected to the intermediate threaded part 8 through a first threaded pair 12, and the second threaded part 10 is connected to the intermediate threaded part 8 through a second threaded pair 11. The first threaded part 7 is used to stop the loading element 6 from continuing to apply force to the force sensor 2 when the force sensor 2 is subjected to the maximum bearing force. The first threaded pair 11 and the second threaded pair 12 have a pitch difference and the same direction of rotation so that when the intermediate threaded part 8 is rotated, the upper and lower threaded parts on both sides move in the same axial direction relative to the intermediate threaded part 8, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

[0089] The pitch difference can be arbitrarily selected. The first threaded pair 12 and the second threaded pair 11 only need to have a pitch difference to achieve the adjustment of the overload protection amplitude. However, when the pitch difference is too large, the axial displacement difference between the first threaded part 7 and the second threaded part 10 will also increase when the intermediate threaded part 8 is rotated, which may make it impossible to accurately adjust the overload protection amplitude.

[0090] Therefore, preferably, the pitch difference between the first threaded part 7 and the second threaded part 10 is 0.05mm-1.0mm. The pitch difference is within the range of 0.05mm-1.0mm, which allows for more precise adjustment of the overload protection amplitude. However, when the pitch difference is small, the amount of operation required to adjust the overload protection amplitude will increase significantly, and the time required will also increase. Therefore, the most preferred option is to select a pitch difference of 0.5mm.

[0091] The embodiments of the differential thread overload protection device of the present invention have been described above, and therefore will not be repeated.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. The scope of patent protection for the present invention is defined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention should also be included within the scope of protection of the present invention.

Claims

1. A differential thread overload protection device, comprising a base (1) and a loading element (6) for transmitting force to a force sensor (2), characterized in that: It also includes an adjustable stop structure, which includes a first threaded part (7), an intermediate threaded part (8), and a second threaded part (10) arranged coaxially. Both the first threaded part (7) and the second threaded part (10) are equipped with anti-rotation structures to keep them circumferentially fixed to the base (1). The first threaded part (7) is connected to the intermediate threaded part (8) through a first threaded pair (12), and the second threaded part (10) is connected to the intermediate threaded part (8) through a second threaded pair (11). The first threaded part (7) is used to stop the load-bearing element (6) from continuing to apply force to the force sensor (2) when the force sensor is subjected to the maximum bearing force. The first threaded pair (12) and the second threaded pair (11) have a pitch difference and are set with a rotation direction so that when the intermediate threaded part (8) is rotated, the upper and lower threaded parts move in the same direction in the axial direction relative to the intermediate threaded part, thereby achieving fine adjustment of the axial length of the adjustable stop structure through the pitch difference.

2. The differential thread overload protection device according to claim 1, characterized in that: The adjustable stop structure is a ring-shaped structure. The first threaded part (7) has a clearance hole in the middle for the load-applying element (6) to pass through. One end of the load-applying element (6) that passes through the first threaded part (7) is used to apply force to the force sensor (2). The first threaded part (7) stops the load-applying element (6) through the edge of the clearance hole.

3. The differential thread overload protection device according to claim 2, characterized in that: The second threaded part (10) is fixedly connected to the base (1), and the adjustable stop structure has a space for accommodating the force sensor (2).

4. The differential thread overload protection device according to claim 3, characterized in that: The first threaded part (7) is located on the radial inner side of the intermediate threaded part (8), and the second threaded part (10) is located on the radial outer side of the intermediate threaded part (8).

5. The differential thread overload protection device according to any one of claims 1-3, characterized in that: The first threaded component (7) and the second threaded component (10) are respectively disposed on the inner and outer sides of the intermediate threaded component (8) radially.

6. The differential thread overload protection device according to any one of claims 1-3, characterized in that: A transmission gear (9) is coaxially mounted on the intermediate threaded part (8). The transmission gear (9) meshes with a drive gear (5) that transmits rotational driving force. The number of teeth of the transmission gear (9) is greater than the number of teeth of the drive gear (5).

7. The differential thread overload protection device according to claim 6, characterized in that: The number of teeth of the transmission gear (9) and the drive gear (5) are both prime numbers.

8. The differential thread overload protection device according to claim 6, characterized in that: The drive gear (5) is controlled to a drive motor (4), and the drive motor (4) is controlled to a controller.

9. The differential thread overload protection device according to claim 6, characterized in that: The transmission gear (9) is detachably connected to the intermediate threaded part (8).

10. A pressure testing device, comprising a force sensor (2) and a differential thread overload protection device, characterized in that: The differential thread overload protection device is any one of the differential thread overload protection devices described in claims 1 to 9.

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