Weight calibration device

Abstract

The present application relates to force sensor testing technical field, disclose the weight calibration device, including the load rod, the weight group and the drive structure, the load rod is suitable for being connected with the force sensor, and is equipped with the first taper hole, the weight group includes at least two weights, all weights are coaxial in vertical direction, any weight includes the body and the hanging rod, the hanging rod is connected to one side of the body, the other side of the body is equipped with the second taper hole, two adjacent weights are connected through the hanging rod and the second taper hole, the hanging rod and the second taper hole are conformational cooperation, the hanging rod of one weight in end position is suitable for being connected with the load rod, the drive structure is set up in the weight group side away from the load rod, the drive end of the drive structure is suitable for being contacted with the other weight in end position, to drive part or all weights to be close to the load rod or away from the load rod through the weight, the present application is favorable to improve the detection accuracy of force sensor, and can improve the calibration effect of calibration device.

Description

Technical Field

[0001] This invention relates to the field of force sensor testing technology, and more specifically to a weight calibration device. Background Technology

[0002] In the field of force sensor calibration and static load testing, weights are widely used as standard force sources due to their advantages such as stable quality, good reproducibility, and high loading accuracy. Traditional weight-based loading calibration devices typically employ a multi-layered weight stacking method, with the entire weight group raised and lowered via a bottom lifting mechanism to apply or remove standard loads to the sensor. This method primarily uses a stacking technique with a clearance fit between cylindrical rods and cylindrical holes; each layer of weights has a central hole and is sequentially placed on a vertical guide rod from top to bottom, supported by a bottom tray. This simple structure and low cost make it widely used.

[0003] However, the existing weight loading devices have many shortcomings in terms of structural design and loading process. On the one hand, multi-layer weights rely on the clearance fit between the cylindrical hole and the cylindrical guide rod for radial positioning. Due to the unavoidable clearance during processing and assembly, the clearance between each layer accumulates after the multi-layer weights are stacked sequentially, causing the upper layer weight to have a random positional offset relative to the lower layer. The center of gravity axis of the weight group deviates significantly from the set loading axis, resulting in a large additional eccentric bending moment, which is directly superimposed on the force sensor being calibrated, severely reducing the calibration measurement accuracy. At the same time, the existing devices lack a controllable layer separation and hanging structure between the weights. When the lifting mechanism is activated, all weights can only be raised and lowered synchronously as a whole. It is impossible to automatically remove some weights to achieve stepped load switching. It is necessary to manually disassemble and add or remove weights, resulting in extremely low calibration efficiency. On the other hand, during manual operation or overall unloading, the weights are prone to momentarily detach from the load-bearing components, resulting in sudden impact loads, and the highly sensitive force measuring elements are susceptible to irreversible damage. In addition, the lifting drive components often remain in contact with the weight set during the calibration process, and their own weight and motion friction inevitably superimpose onto the measuring end, introducing additional systematic errors. Moreover, most existing devices lack flexible expansion interfaces and have poor versatility. Summary of the Invention

[0004] The present invention provides a weight calibration device to solve the above-mentioned problems.

[0005] In a first aspect, the present invention provides a weight calibration device, comprising: A load-bearing rod, which is adapted to be connected to a force sensor and has a first conical hole; A weight set includes at least two weights, all of which are coaxially arranged in the vertical direction. Each weight includes a body and a hanging rod. The hanging rod is connected to one side of the body, and a second conical hole is provided on the other side of the body. Two adjacent weights are connected through the hanging rod and the second conical hole. The hanging rod and the second conical hole are conically fitted. The hanging rod of one of the weights located at the end position is adapted to be fitted and connected to the first conical hole of the load-bearing rod. A driving structure is provided on the side of the weight group away from the load-bearing rod, and the driving end of the driving structure is adapted to contact another weight located at the end position to drive part or all of the weights toward or away from the load-bearing rod by the weight. The two adjacent weights are spaced apart, and the volumes of the first and second conical holes are both larger than the volume of the hanging rod, so that the hanging rod is suitable for being suspended in the first or second conical hole under the drive of the drive structure.

[0006] Beneficial effects: By setting a weight group between the load-bearing rod and the drive structure, the weight group includes several weights, all of which are coaxially arranged to ensure that the gravity of all weights can be transmitted on the same axis. In addition, adjacent weights are connected by a hanging rod and a conical fit with a second conical hole, so that two adjacent weights can always remain coaxial. The volume of the second conical hole is larger than the volume of the hanging rod, allowing the hanging rod to be suspended in the second conical hole under the drive of the drive structure. This allows two adjacent weights to be separated, so that the gravity of the weights acts on the drive end of the drive structure, achieving the effect of unloading the weights. When the drive force of the drive structure is removed, the hanging rod can contact the second conical hole again, so that the gravity of the weights acts on the weights near the load-bearing rod, achieving the effect of loading weights. Thus, it is beneficial to improve the detection accuracy of the force sensor and improve the calibration effect of the calibration device.

[0007] In one alternative embodiment, the hanging rod is connected to the central axis of the weight, the first conical hole is formed on the central axis of the load-bearing rod, and the second conical hole is formed on the central axis of the body.

[0008] Beneficial effects: By connecting the hanging rod to the central axis of the weights, opening the first conical hole on the central axis of the load-bearing rod, and opening the second conical hole on the central axis of the body, since the weights and the load-bearing rod are connected through the hanging rod and the first conical hole, and adjacent weights are connected through the hanging rod and the second conical hole, when the hanging rod, the first conical hole, and the second conical hole on the central axis are connected, it can be ensured that the central axis of the load-bearing rod coincides with the central axis of all the weights and the central axis of adjacent weights. In this way, the gravity between all the weights can be transmitted on the central axis.

[0009] In one optional embodiment, the hanging rod includes a connecting rod and a conical platform. One end of the connecting rod is connected to the weight, and the other end is connected to the conical platform. The conical platform conforms to the second conical hole, and the volume of the conical platform is smaller than the volume of the second conical hole.

[0010] Beneficial effects: By setting up a hanging rod including a connecting rod and a conical platform, one end of the connecting rod is connected to the weight, and the other end is connected to the conical platform. The conical platform can conformally fit into part of the second conical hole. Thus, when connecting two connected weights, the connecting rod can pass through the second conical hole on one of the weights and connect with the other weight when it passes through, so that the conical platform can enter into the second conical hole and achieve a conical fit with the second conical hole. It should be noted that the volume of the conical platform is smaller than the volume of the second conical hole, so that the conical platform can be suspended in the second conical hole under the drive of the drive structure.

[0011] In one optional embodiment, the tip of the first conical hole is positioned towards the weight set, the tip of the second conical hole is positioned away from the hanging rod, and the cross-sectional area of ​​the openings of both the first and second conical holes is larger than the cross-sectional area of ​​the connecting rod.

[0012] Beneficial effects: By setting the tip of the first conical hole to face the weight set and the tip of the second conical hole to face away from the hanging rod, the first and second conical holes can limit and fix the conical platform when it contacts the first and second conical holes, thereby coaxially connecting the weight, the load-bearing rod, and two adjacent weights together. Furthermore, by setting the cross-sectional area of ​​both the first and second conical holes to be larger than the cross-sectional area of ​​the connecting rod, the connecting rod can easily pass through the conical holes when connecting the load-bearing rod, the weight, and two adjacent weights. When the connecting rod moves relative to the conical holes, it will not contact the load-bearing rod or the weights, thus avoiding friction between the connecting rod and the load-bearing rod or the weights, which would affect the weight's gravitational effect on the load-bearing rod and further influence the detection accuracy of the sensor.

[0013] In one optional embodiment, the second conical hole includes a conical hole and a circular hole connected together; the weight further includes an adapter, the adapter being adapted to be installed in the circular hole and connected to the body by a fastener, the central axis of the adapter coinciding with the central axis of the weight, and the connecting rod being adapted to be threadedly connected to the adapter.

[0014] Beneficial effects: By setting a second conical hole including a connected conical hole and a round hole, and setting a weight, an adapter is also included. In this embodiment, the adapter is an adapter plate. The adapter can be installed in the round hole and connected to the body by fasteners. In this embodiment, the fasteners are screws, and the central axis of the adapter coincides with the central axis of the weight. Thus, when the adapter is installed in the round hole, the adapter can block the conical hole. In addition, the hanging rod and the adapter are connected by threads, so that the hanging rod can be separated from the adapter. Then, when the hanging rod passes through the second conical hole, it can be connected to the adapter. In this way, it is convenient to connect two adjacent weights.

[0015] In one alternative embodiment, the mating cone angle between the hanging rod and the second tapered hole ranges from 30 degrees to 120 degrees.

[0016] Beneficial effects: By setting the range of the mating cone angle between the hanging rod and the second conical hole to 30 degrees-120 degrees, since the tip of the second conical hole is set away from the load-bearing rod, it is sufficient to ensure that the two adjacent weights will not separate when the hanging rod and the second conical hole are in contact. Furthermore, setting the range of the mating cone angle between the hanging rod and the second conical hole to 30 degrees-120 degrees is because the centering accuracy of the cone angle with a smaller angle is higher, while the assembly fault tolerance of the cone angle with a larger angle is better.

[0017] In one alternative embodiment, the drive structure includes a drive member and a tray, the drive end of the drive member being connected to the tray, and the tray being adapted to contact or separate from the weights located away from the load-bearing rod under the drive of the drive member.

[0018] Beneficial effects: By setting a driving structure including a driving component and a tray, the driving end of the driving component is connected to the tray. The tray can contact or separate from the weights away from the load-bearing rod under the drive of the driving component. When the tray contacts the weights, the tray can drive the weights closer to the load-bearing rod, so that several adjacent weights are separated, reducing the weight force on the load-bearing rod. In addition, the tray can also drive the weights away from the load-bearing rod, so that several adjacent weights are automatically guided to contact by the conical surface, increasing the weight force on the load-bearing rod. When the tray separates from the weights, all weights are connected to the load-bearing rod.

[0019] In one alternative embodiment, the driving component is one of a lift, a servo electric actuator, a stepping slide, a hydraulic lift, or a pneumatic lift actuator.

[0020] In one optional embodiment, the weight set includes several weights of different specifications, any one of which is a flat disc, a cuboid, or a cylinder.

[0021] Beneficial effects: By setting up a weight set including several weights of different specifications and setting any weight to a flat disc shape, cuboid or cylinder shape, since adjacent weights are connected by a hanging rod and a second conical hole, the weight set does not have high requirements for the specifications of each weight. It is only necessary to understand the specifications of each weight before testing to ensure the accuracy of the test data.

[0022] In one alternative embodiment, any of the weights is made of one or more of stainless steel, aluminum alloy, cast iron, or tungsten alloy. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a plan view of a weight calibration device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a weight in a weight calibration device according to an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of a weight in a weight calibration device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the weight group of a weight calibration device according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures: 1-Bearing rod; 2-Weight set; 21-Weight; 22-Hanging rod; 23-Second conical hole; 24-Adapter; 3-Drive structure; 31-Drive component; 32-Tray. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0028] According to an embodiment of the present invention, in one aspect, a calibration device for a weight 21 is provided, such as... Figures 1 to 4 As shown, the device includes a load-bearing rod 1, a weight set 2, and a driving structure 3. The load-bearing rod 1 is adapted to connect with a force sensor and has a first conical hole. The weight set 2 includes at least two weights 21, all of which are coaxially arranged in the vertical direction. Each weight 21 includes a body and a hanging rod 22. The hanging rod 22 is connected to one side of the body, and a second conical hole 23 is provided on the other side of the body. Two adjacent weights 21 are connected through the hanging rod 22 and the second conical hole 23. The hanging rod 22 and the second conical hole 23 are conformally fitted. One of the weights 21 located at the end position... The hanging rod 22 of 1 is adapted to be connected to the load-bearing rod 1; the driving structure 3 is set on the side of the weight group 2 away from the load-bearing rod 1, and the driving end of the driving structure 3 is adapted to contact another weight 21 located at the end position, so as to drive part or all of the weight 21 to move closer to or away from the load-bearing rod 1 through the weight 21; wherein, two adjacent weights 21 are spaced apart, and the volume of the first conical hole and the second conical hole 23 is larger than the volume of the hanging rod 22, so that the hanging rod 22 is adapted to be suspended in the first conical hole or the second conical hole 23 under the drive of the driving structure 3.

[0029] The aforementioned weight 21 calibration device uses a weight group 2 positioned between the load-bearing rod 1 and the drive structure 3. The load-bearing rod 1 is rigidly connected to a force sensor and has a first conical hole. The weight group 2 includes several weights 21, all coaxially arranged vertically. Each weight 21 includes a body and a hanging rod 22. The hanging rod 22 is connected to one side of the body, and a second conical hole 23 is provided on the other side of the body, thereby ensuring proper alignment between the weight 21 and the load-bearing rod 1. The weights 21 can be connected by a hanging rod 22 and a first conical hole. Specifically, the hanging rod 22 on the weight 21 is inserted into the first conical hole in the load-bearing rod 1, thus connecting the load-bearing rod 1 and the weight 21 together. Two adjacent weights 21 can be connected by a hanging rod 22 and a second conical hole 23. Specifically, the hanging rod 22 on one side of one of the two adjacent weights 21 is inserted into the second conical hole 23 on the other side of the weight 21, thus connecting the two adjacent weights 21 coaxially together.

[0030] Specifically, the hanging rod 22 and the second conical hole 23 are conformally fitted, specifically a conical fit. Thus, when connecting two adjacent weights 21, one end of the hanging rod 22 can pass through the second conical hole 23 on one of the weights 21, and the hanging rod 22 connects to the other weight 21 as it exits the second conical hole 23. This ensures a conformal fit between the hanging rod 22 and the second conical hole 23 while connecting two adjacent weights 21. Furthermore, the conformal fit between the hanging rod 22 and the second conical hole 23 ensures that when two adjacent weights 21 are connected, they remain coaxial and will not change due to external forces. This guarantees that the force from multiple weights 21 can be transmitted along the same axis, avoiding force dispersion and inaccurate detection.

[0031] It should be noted that the two adjacent weights 21 are spaced apart, and the volume of the second conical hole 23 is larger than the volume of the hanging rod 22. This allows the hanging rod 22 to be suspended within the second conical hole 23 under external force, thereby separating the two adjacent weights 21 and preventing the weight 21 farther from the load-bearing rod 1 from affecting the load-bearing rod 1. When the external force is removed, the hanging rod 22 can then contact the second conical hole 23 under the weight of the weight 21, allowing the weight 21 closer to the load-bearing rod 1 to exert its weight and affect the load-bearing rod 1. Furthermore, the volume of the first conical hole is also larger than the volume of the hanging rod 22, allowing the hanging rod 22 to be suspended within the first conical hole under external force, thus separating the load-bearing rod 1 from the weight 21 and achieving complete unloading.

[0032] Furthermore, among all the weights 21, the hanging rod 22 of one of the weights 21 located at the end position can be connected to the first conical hole of the load-bearing rod 1. The driving structure 3 is located on the side of the weight group 2 away from the load-bearing rod 1, and the driving end of the driving structure 3 can contact the other weight 21 located at the end position. Thus, under the drive of the driving structure 3, the weight 21 in contact with the driving end of the driving structure 3 can drive part or all of the weights 21 to move closer to or away from the load-bearing rod 1. When the weight 21 is close to the load-bearing rod 1, part or all of the weights 21 can exert their weight on the driving end of the driving structure 3, so that the load-bearing rod 1 does not bear the weight of that part of the weight 21, thereby achieving the effect of unloading the weight 21. When the weight 21 is away from the load-bearing rod 1, part or all of the weights 21 will exert their weight on the load-bearing rod 1, so that the load-bearing rod 1 bears the weight of that part of the weight 21, thereby achieving the effect of loading the weight 21.

[0033] Specifically, when unloading weight 21, a layer-by-layer unloading method is adopted. The drive component 31 drives the tray 32 to contact the bottom weight 21 and lift it upward. The hanging rod 22 of the bottom weight 21 disengages from the second conical hole 23 of the adjacent weight 21 in the upper layer. When the bodies of the two weights 21 are not in contact, the weight borne by the uppermost load-bearing rod 1 is reduced by the weight of one weight 21. As the elevator continues to move upward, when the bodies of the two weights 21 contact, the hanging rod 22 of the second layer weight 21 disengages from the second conical hole 23 of the body of the uppermost (third layer) weight 21, and the weight of the uppermost load-bearing rod 1 is reduced by the weight of two weights 21. This process continues until the hanging rod 22 of the top weight 21 disengages from the first conical hole of the load-bearing rod 1. At this point, all loads are unloaded. When it is necessary to unload part of the load, the number of unloading weights 21 required can be calculated based on the weight of a single weight 21. Then, the upward movement distance can be calculated based on the number of weights 21 and the distance between adjacent weights 21. The drive unit 31 drives the tray 32 to move upward to the corresponding displacement.

[0034] When loading the weights 21, a layer-by-layer loading method is adopted. The drive component 31 drives the tray 32 to move downward. The top weight 21 moves downward with the tray 32 under its own weight until the top hanging rod 22 contacts the first conical hole of the load-bearing rod 1. At this time, the load-bearing rod 1 bears the weight of one weight 21. As the tray 32 continues to move downward, the hanging rod 22 of the second top weight 21 contacts the second conical hole 23 of the top weight 21. The body of the third weight 21 separates from the body of the second top weight 21, but the hanging rod 22 of the third weight 21 does not contact the first conical hole of the body of the second top weight 21. At this time, the load-bearing rod 1 bears the weight of two weights 21. And so on. When the bottom weight 21 separates from the elevator tray 32, the load-bearing rod 1 bears the weight of all weights 21. When a partial load needs to be applied, the number of weights 21 required can be calculated based on the weight of a single weight 21. Then, the downward movement distance can be calculated based on the number of weights 21 and the distance between adjacent weights 21, and the elevator can be driven to move downward to the corresponding displacement.

[0035] When the driving end of the driving structure 3 drives the weight 21 away from the load-bearing rod 1, the hanging rod 22 of the weight 21 away from the load-bearing rod 1 conformally engages with the second conical hole 23 of the weight 21 close to the load-bearing rod 1. The two weights 21 automatically align with each other by means of conical guidance, and due to the conical engagement, the two weights 21 can remain coaxial. Ultimately, all weights 21 are coaxial. During the repeated layer-by-layer hanging and detaching of the weights 21, the center line remains consistent.

[0036] Since the driving structure 3 is located on the side of the weight group 2 away from the load-bearing rod 1, and its driving method is to lift or lower the weight 21, and adjacent weights 21 can also be separated, the driving force of the driving structure 3 will not affect the load-bearing rod 1, so as to ensure the detection accuracy of the force sensor connected to the load-bearing rod 1.

[0037] In summary, the weight group 2, which is set between the load-bearing rod 1 and the driving structure 3, includes several weights 21. All weights 21 are coaxially arranged to ensure that the gravity of all weights 21 can be transmitted on the same axis. In addition, adjacent weights 21 are connected by a hanging rod 22 and a conical fit with a second conical hole 23, so that two adjacent weights 21 can always remain coaxial. The volume of the second conical hole 23 is larger than the volume of the hanging rod 22, so that the hanging rod 22 can be driven by the driving structure 3. Suspended within the second conical hole 23, the adjacent weights 21 can be separated, allowing the weight 21's gravity to act on the driving end of the driving structure 3, thus unloading the weight 21. When the driving force of the driving structure 3 is removed, the hanging rod 22 can contact the second conical hole 23 again, allowing the weight 21's gravity to act on the weight 21 near the load-bearing rod 1, thus loading the weight 21. This improves the detection accuracy of the force sensor and enhances the calibration effect of the calibration device.

[0038] In one embodiment, such as Figures 1 to 4 As shown, the hanging rod 22 is connected to the central axis of the weight 21, the first conical hole is opened on the central axis of the load-bearing rod 1, and the second conical hole 23 is opened on the central axis of the body.

[0039] The weight 21 calibration device described above, by connecting the hanging rod 22 to the central axis of the weight 21, opening the first conical hole on the central axis of the load-bearing rod 1, and opening the second conical hole 23 on the central axis of the main body, ensures that the load-bearing rod 1 and the central axis of all weights 21 and adjacent weights 21 can coincide when the hanging rod 22, the first conical hole, and the second conical hole 23 on the central axis are connected. In this way, the gravity between all weights 21 can be transmitted on the central axis.

[0040] In one embodiment, such as Figure 3 and Figure 4 As shown, the hanging rod 22 includes a connecting rod and a conical platform. One end of the connecting rod is connected to the weight 21, and the other end is connected to the conical platform. The conical platform fits into the second conical hole 23, and the volume of the conical platform is smaller than the volume of the second conical hole 23.

[0041] The weight 21 calibration device described above includes a connecting rod and a conical platform, with one end of the connecting rod connected to the weight 21 and the other end connected to the conical platform. The conical platform can conformally fit into a portion of the second conical hole 23. Thus, when connecting two connected weights 21, the connecting rod can pass through the second conical hole 23 on one of the weights 21 and connect to the other weight 21 when it exits, allowing the conical platform to enter the second conical hole 23 and achieve a conical fit with it. It should be noted that the volume of the conical platform is smaller than the volume of the second conical hole 23, so that the conical platform can be suspended within the second conical hole 23 under the drive of the driving structure 3.

[0042] In one embodiment, such as Figure 3 and Figure 4 As shown, the tip of the first conical hole faces the weight group 2, and the tip of the second conical hole 23 faces away from the hanging rod 22. The cross-sectional area of ​​the openings of the first conical hole and the second conical hole 23 is larger than the cross-sectional area of ​​the connecting rod.

[0043] The weight 21 calibration device described above, by setting the tip of the first conical hole towards the weight group 2 and the tip of the second conical hole 23 away from the hanging rod 22, allows the first and second conical holes 23 to limit and fix the conical platform when it contacts the first and second conical holes 23, thereby coaxially connecting the weight 21 with the load-bearing rod 1 and two adjacent weights 21. Furthermore, by setting the cross-sectional area of ​​the openings of both the first and second conical holes 23 to be larger than the cross-sectional area of ​​the connecting rod, the connecting rod can easily pass through the conical holes when connecting the load-bearing rod 1 and the weights 21 and two adjacent weights 21. When the connecting rod moves relative to the conical holes, it will not contact the load-bearing rod 1 or the weights 21, thus avoiding friction between the connecting rod and the load-bearing rod 1 or the weights 21, which would affect the gravity effect of the weights 21 on the load-bearing rod 1 and further affect the detection accuracy of the sensor.

[0044] In one embodiment, such as Figures 2 to 4 As shown, the second conical hole 23 includes a conical hole and a round hole connected together; the weight 21 also includes an adapter 24, which is adapted to be installed in the round hole and connected to the body by fasteners. The central axis of the adapter 24 coincides with the central axis of the weight 21, and the connecting rod is adapted to be threadedly connected to the adapter 24.

[0045] The weight 21 calibration device described above includes a second conical hole 23 (comprising a connected conical hole and a circular hole), a weight 21, and an adapter 24. In this embodiment, the adapter 24 is an adapter plate. The adapter 24 can be installed in the circular hole and connected to the main body using fasteners, which are screws in this embodiment. The central axis of the adapter 24 coincides with the central axis of the weight 21. Thus, when the adapter 24 is installed in the circular hole, it can block the conical hole. In addition, the hanging rod 22 is threadedly connected to the adapter 24, allowing the hanging rod 22 to be separated from the adapter 24. When the hanging rod 22 passes through the second conical hole 23, it can be connected to the adapter 24. This facilitates the connection of two adjacent weights 21.

[0046] In one embodiment, such as Figure 3 and 4 As shown, the range of the mating cone angle between the hanging rod 22 and the second conical hole 23 is 30 degrees to 120 degrees.

[0047] The weight 21 calibration device described above sets the range of the engagement cone angle between the hanging rod 22 and the second conical hole 23 to 30 degrees-120 degrees. Since the tip of the second conical hole 23 is set away from the load-bearing rod 1, it is sufficient to ensure that the two adjacent weights 21 will not separate when the hanging rod 22 and the second conical hole 23 are in contact. Furthermore, setting the range of the engagement cone angle between the hanging rod 22 and the second conical hole 23 to 30 degrees-120 degrees is because a smaller cone angle has higher centering accuracy, while a larger cone angle has better assembly tolerance.

[0048] In one embodiment, such as Figure 1 As shown, the drive structure 3 includes a drive member 31 and a tray 32. The drive end of the drive member 31 is connected to the tray 32. The tray 32 is adapted to contact or separate from the weight 21 away from the load-bearing rod 1 under the drive of the drive member 31.

[0049] The weight 21 calibration device with the above structure includes a driving structure 3 comprising a driving element 31 and a tray 32. The driving end of the driving element 31 is connected to the tray 32. The tray 32 can contact or separate from the weight 21 away from the load-bearing rod 1 under the drive of the driving element 31. When the tray 32 contacts the weight 21, the tray 32 can drive the weight 21 closer to the load-bearing rod 1 to separate several adjacent weights 21 and reduce the weight force of the weight 21 on the load-bearing rod 1. In addition, the tray 32 can also drive the weight 21 away from the load-bearing rod 1 so that several adjacent weights 21 can automatically contact each other by conical surface guidance, increasing the weight force of the weight 21 on the load-bearing rod 1. When the tray 32 separates from the weight 21, all weights 21 are connected to the load-bearing rod 1.

[0050] In one embodiment, such as Figure 1 As shown, the drive component 31 is one of a lifting platform, a servo electric push rod, a stepping slide, a hydraulic lifting platform, or a pneumatic lifting push rod.

[0051] In one embodiment, such as Figures 1 to 4 As shown, the weight set 2 includes several weights 21 of different specifications, and any weight 21 is in the shape of a flat disc, a cuboid, or a cylinder.

[0052] The above-described calibration device for weights 21 includes a weight group 2 comprising several weights 21 of different specifications, and any weight 21 is configured as a flat disc, cuboid, or cylinder. Since adjacent weights 21 are connected by a hanging rod 22 and a second conical hole 23, the weight group 2 does not have high requirements for the specifications of each weight 21. It is only necessary to understand the specifications of each weight 21 before testing to ensure the accuracy of the test data.

[0053] In one embodiment, such as Figures 1 to 4 As shown, any weight 21 is made of one or more of the following materials: stainless steel, aluminum alloy, cast iron, or tungsten alloy.

[0054] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A weight calibration device, characterized in that, include: A load-bearing rod (1), which is adapted to be connected to a force sensor and has a first conical hole; The weight set (2) includes at least two weights (21), all of which are coaxially arranged in the vertical direction. Each weight (21) includes a body and a hanging rod (22). The hanging rod (22) is connected to one side of the body, and a second conical hole (23) is provided on the other side of the body. Two adjacent weights (21) are connected through the hanging rod (22) and the second conical hole (23). The hanging rod (22) conformally fits the second conical hole (23). The hanging rod (22) of one of the weights (21) located at the end position is adapted to conformally fit the first conical hole of the load-bearing rod (1). A driving structure (3) is provided on the side of the weight group (2) away from the load-bearing rod (1). The driving end of the driving structure (3) is adapted to contact another weight (21) located at the end position so as to drive part or all of the weight (21) to move closer to or away from the load-bearing rod (1) by the weight (21). The two adjacent weights (21) are spaced apart, and the volumes of the first conical hole and the second conical hole (23) are both larger than the volume of the hanging rod (22), so that the hanging rod (22) is suitable to be suspended in the first conical hole or the second conical hole (23) under the drive of the driving structure (3); The hanging rod (22) is connected to the central axis of the weight (21), the first conical hole is opened on the central axis of the load-bearing rod (1), and the second conical hole (23) is opened on the central axis of the body; The hanging rod (22) includes a connecting rod and a conical platform. One end of the connecting rod is connected to the body and the other end is connected to the conical platform. The conical platform fits into the second conical hole (23), and the volume of the conical platform is smaller than the volume of the second conical hole (23). The tip of the first conical hole is set towards the weight group (2), and the tip of the second conical hole (23) is set away from the hanging rod (22). The cross-sectional area of ​​the openings of the first conical hole and the second conical hole (23) is larger than the cross-sectional area of ​​the connecting rod.

2. The weight calibration device according to claim 1, characterized in that, The second conical hole (23) includes a conical hole and a round hole connected together; the weight (21) also includes an adapter (24), the adapter (24) is adapted to be installed in the round hole and connected to the body by fasteners, the central axis of the adapter (24) coincides with the central axis of the weight (21), and the connecting rod is adapted to be threadedly connected to the adapter (24).

3. The weight calibration device according to claim 2, characterized in that, The range of the engagement cone angle between the hanging rod (22) and the second conical hole (23) is 30 degrees to 120 degrees.

4. The weight calibration device according to claim 2, characterized in that, The drive structure (3) includes a drive member (31) and a tray (32). The drive end of the drive member (31) is connected to the tray (32). The tray (32) is adapted to contact or separate from the weight (21) away from the load-bearing rod (1) under the drive of the drive member (31).

5. The weight calibration device according to claim 4, characterized in that, The drive component (31) is one of the following: a lift, a servo electric push rod, a stepping slide, a hydraulic lift, or a pneumatic lift push rod.

6. The weight calibration device according to claim 1, characterized in that, The weight set (2) includes several weights (21) of different specifications, and any one of the weights (21) is a flat disc, a cuboid or a cylinder.

7. The weight calibration device according to claim 6, characterized in that, The material of any of the weights (21) is one or more of stainless steel, aluminum alloy, cast iron or tungsten alloy.

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