A lateral acceleration and force compound sensor and an assembling method thereof

Abstract

A lateral acceleration and force composite sensor and an assembling method thereof belong to the technical field of sensors, comprising a base provided with an impact seat, wherein a center position of a top end of the impact seat is provided with an impact point, and a lower end of the impact seat is provided with a force detection core; a first mounting hole, a second mounting hole and a third mounting hole are provided at an interval on one side end face of the impact seat, the third mounting hole is located between the first mounting hole and the second mounting hole, a fourth mounting hole is provided on the other side end face of the impact seat, an axis of the fourth mounting hole is perpendicular to and communicates with the axes of the first mounting hole, the second mounting hole and the third mounting hole, and an acceleration detection core is arranged in the third mounting hole and the fourth mounting hole. The force detection core and the acceleration detection core are independent in the force transmission path, the structural coupling is reduced, the interference of impact deformation on acceleration detection is reduced, the influence of acceleration inertia on force detection accuracy is avoided, the acceleration detection core is independently installed, and the detection in each direction does not interfere with each other.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and in particular to a lateral acceleration and force composite sensor and its assembly method. Background Technology

[0002] With the development of fields such as intelligent vehicles, industrial robots, aerospace and precision measurement and control, the demand for integrated detection of precise monitoring of equipment motion status and real-time force perception continues to rise. Lateral acceleration and contact force, as core motion and mechanical parameters, are important bases for equipment attitude control, fault diagnosis and safety protection.

[0003] The industry often uses separate detection solutions for accelerometers and force sensors, which are difficult to adapt to high-precision and high-synchronization detection scenarios. To solve the shortcomings of separate sensor installation, composite accelerometers and force sensors have been adopted. Existing composite sensors usually integrate the acceleration detection core and the force detection core into the same housing.

[0004] The acceleration detection core and the force detection core are integrated in the same housing. Due to the limitations of internal space and force path, structural coupling can easily occur between the two types of detection cores. This can cause structural deformation caused by impact loads to interfere with acceleration detection. At the same time, the inertial effect during acceleration detection may also affect the detection. In addition, when existing composite sensors perform lateral acceleration detection in multiple directions such as front-back, left-right, etc., the detection cores are prone to mutual influence, and there are positioning deviations during assembly, which leads to a decrease in detection accuracy in different directions. Furthermore, the mass block in the lateral acceleration detection structure is usually a cylindrical structure. During the assembly pre-tightening process, the pre-tightening stress can be concentrated and transferred to the sensitive element, causing uneven stress on the sensitive element. Summary of the Invention

[0005] To address the technical problems of existing composite sensors mentioned above, such as mutual interference between detection cores, insufficient sensitivity in lateral acceleration detection, uneven force detection, susceptibility of sensitive elements to pre-stress damage, and insufficient assembly positioning accuracy, this invention provides a lateral acceleration and force composite sensor and its assembly method.

[0006] The technical solution of this invention is as follows: This invention provides a lateral acceleration and force composite sensor, including a base, on which a cubic impact seat is fixedly mounted. An impact point is located at the center of the top of the impact seat, and a force detection core is mounted at the center of the lower end of the impact seat. A first mounting hole, a second mounting hole, and a third mounting hole are spaced apart along the length of one side of the impact seat, all of which laterally penetrate the impact seat. The third mounting hole is located between the first and second mounting holes. A fourth mounting hole is located at the center of the other side of the impact seat, with its axis perpendicular to and connected to the axes of the first, second, and third mounting holes. Two opposing screws are threaded into each of the first, second, and fourth mounting holes. One set of acceleration detection cores is housed in the third mounting hole and clamped and limited by the screws in the fourth mounting hole. Two sets of acceleration detection cores are housed in the fourth mounting hole and clamped and limited by the screws in the first and second mounting holes, respectively. The force detection core is arranged axially along the lower center of the impact seat, while the lateral acceleration detection core is orthogonally arranged inside the impact seat along two perpendicular directions. The force transmission paths of the two types of detection are independent of each other, reducing structural coupling at the structural level. This reduces the interference of impact deformation on acceleration detection and avoids the influence of acceleration inertia on detection accuracy. The two lateral acceleration detection cores are installed and clamped by screws independently, and the detection in each direction does not interfere with each other. The positioning method of direct screw clamping has a clear reference and small assembly deviation, which can effectively improve the detection accuracy in different directions. The overall structure is compact and integrated, and can output axial force and dual-axis lateral acceleration signals simultaneously, making it suitable for detection conditions with limited installation space.

[0007] Preferably, the third mounting hole is a through hole structure, while the first, second, and fourth mounting holes are threaded hole structures. The third mounting hole adopts a through hole structure, which facilitates the insertion and alignment adjustment of the acceleration detection core. The threaded hole cooperates with the clamping screw, ensuring a reliable clamping force and high thread machining accuracy, which can guarantee the coaxiality of the core positioning and reduce the detection error caused by assembly eccentricity.

[0008] Preferably, a set of acceleration detection cores is placed at the center of the third mounting hole; the two sets of acceleration detection cores in the fourth mounting hole are located outside the two screws in the fourth mounting hole; the single core in the third mounting hole is centrally arranged, with symmetrical force and accurate detection reference; the two sets of cores in the fourth mounting hole are placed on both sides of the screw and arranged symmetrically to ensure that the two sets of cores are evenly stressed and have good detection consistency.

[0009] Preferably, the impact point is a hemispherical protrusion, which can accurately introduce the center of the impact load, ensure that the load is transmitted along the central axis of the impact seat, avoid the introduction of additional lateral force by off-center loading, and affect the accuracy of impact detection; the spherical contact can be adapted to a certain angle of inclined impact input, and the force transmission is stable and widely applicable.

[0010] Preferably, a screw cylinder is fixedly installed at the lower center of the impact seat. The screw cylinder has a quarter-section structure. The force detection core includes a force ceramic, which is set inside the screw cylinder. The screw cylinder is threadedly connected to a nut. The quarter-section screw cylinder and the nut have a contraction and clamping structure. When the nut is tightened, the screw cylinder contracts evenly in the circumference and clamps the force ceramic radially. The preload is evenly distributed in the circumference to ensure that the force-sensitive element is subjected to uniform force, improve the linearity and consistency of the detection, and the thread preload is easy to adjust and the preload is controllable.

[0011] Preferably, a countersunk hole for the core is provided at the upper center of the base. The screw and nut are inserted into the countersunk hole. The countersunk hole provides radial positioning for the impact seat and the force detection core, ensuring that the overall structure is coaxially aligned and avoiding detection deviation caused by eccentricity. The countersunk hole forms a stable support structure, which can effectively transmit axial loads and limit radial movement, thereby improving structural stability.

[0012] Preferably, the base is provided with wire holes, the side of the base is provided with connector holes and a four-core connector is installed, and the bottom of the base is provided with fixing holes. The wire holes facilitate the centralized lead-out of the signal lines of each detection core, and the wiring is neat. The four-core connector uniformly outputs axial force and dual-axis lateral acceleration signals, with high interface integration and convenient field wiring. The bottom fixing holes provide a reference for the overall installation of the sensor, making installation and fixing convenient and reliable.

[0013] Preferably, the acceleration detection core includes an acceleration ceramic and a first mass block. Both the acceleration ceramic and the first mass block are cylindrical structures. The first mass block is sleeved on the outside of the acceleration ceramic. The inner wall of the first mass block is provided with two opposing deformation grooves. The cylindrical structure has good coaxiality and is convenient for assembly and alignment. The opposing deformation grooves on the inner wall of the mass block can generate a small amount of elastic deformation during pre-tightening and clamping, absorbing part of the clamping stress and avoiding the concentrated transmission of pre-tightening stress to the acceleration ceramic. This ensures that the sensitive element is subjected to uniform force and improves the consistency and long-term stability of the detection.

[0014] Preferably, the impact seat has an outer shell with openings at both the top and bottom. The outer shell is fixedly connected to the impact seat and the base, forming an external protective structure that can prevent external dust and moisture from entering the interior and protect sensitive components. At the same time, it can shield external electromagnetic interference and improve the quality of detection signals. The opening structure at the top and bottom facilitates the assembly of internal components and the lead-out of signal lines.

[0015] A method for assembling a lateral acceleration and force composite sensor, comprising: One set of acceleration detection cores is installed in the third mounting hole and clamped and fixed by two screws in the fourth mounting hole; two sets of acceleration detection cores are installed opposite each other in the fourth mounting hole, so that the two sets of acceleration detection cores are distributed on the outside of the two screws in the fourth mounting hole, and clamped and fixed by two screws in the first mounting hole and the second mounting hole respectively. Install the force ceramic into the screw barrel, tighten the nut to shrink the screw barrel, then install the assembled impact seat onto the base, so that the screw barrel is inserted into the countersunk hole of the core, and finally fix the outer shell on the outside of the impact seat.

[0016] The process utilizes an independent assembly path from the inside out, with each direction's acceleration core installed and clamped independently. The assembly process is non-interfering, and the positioning benchmark is clear, effectively controlling the impact of assembly deviations on detection accuracy. The force detection core employs a four-part screw-type shrink-clamping pre-tightening method, ensuring uniform pre-tightening force distribution and avoiding stress concentration problems associated with traditional press-fitting, thus guaranteeing balanced force on the sensitive element. The overall assembly process is clear, with unified benchmarks, effectively ensuring the performance consistency of batch products and achieving high assembly efficiency.

[0017] As can be seen from the above technical solutions, the advantages of the present invention are: 1. The force detection core is arranged axially along the lower center of the impact seat, and the lateral acceleration detection core is arranged orthogonally in two vertical directions inside the impact seat. The force transmission paths of the two types of detection are independent of each other, reducing structural coupling at the structural level. This reduces the interference of impact deformation on acceleration detection and avoids the influence of acceleration inertia on detection accuracy. The two vertical and lateral acceleration detection cores are installed and clamped by independent screws, and the detection in each direction does not interfere with each other. The positioning method of direct screw clamping has a clear reference and small assembly deviation, which can effectively improve the detection accuracy in different directions. The overall structure is compact and integrated, and can output axial force and dual-axis lateral acceleration signals simultaneously, which is suitable for detection conditions with limited installation space.

[0018] 2. The force sensing core structure adopts a four-part screw barrel encasing ceramic. The screw barrel is tightened by a nut to compress the ceramic. When the nut is subjected to longitudinal impact load, the screw barrel can uniformly compress and deform the ceramic, accurately capturing the mechanical change signal and stably achieving high-precision detection of longitudinal force. This four-part encasing structure has uniform force distribution and sensitive deformation response, which can effectively avoid detection distortion caused by stress concentration. The structure is simple and reliable, with high assembly consistency, and balances force detection sensitivity and structural impact resistance.

[0019] 3. The deformation groove is designed so that the first mass block can undergo a certain amount of slight deformation during the assembly pre-tightening process, thereby adapting to the assembly state of the acceleration ceramic and making the extrusion pressure acting on the acceleration ceramic more uniform. When the sensor is subjected to lateral acceleration, the first mass block will generate a corresponding lateral movement tendency under the action of inertia, and transmit the inertial force to the acceleration ceramic, so that the acceleration ceramic generates a corresponding charge signal to realize lateral acceleration detection. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional structural schematic diagram of the lateral acceleration and force composite sensor according to one or more embodiments of the present invention; Figure 2 This is a schematic diagram of the external structure of the lateral acceleration and force composite sensor according to one or more embodiments of the present invention; Figure 3 This is an exploded structural diagram of a lateral acceleration and force composite sensor according to one or more embodiments of the present invention. Figure 4 This is a schematic diagram of the structure of the base according to one or more embodiments of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the base according to one or more embodiments of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the impact seat according to one or more embodiments of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the impact seat according to one or more embodiments of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the structure of the first mass block according to one or more embodiments of the present invention; Figure 9 This is a schematic diagram of the structure of a nut according to one or more embodiments of the present invention. Figure 1 ; Figure 10 This is a schematic diagram of the structure of a nut according to one or more embodiments of the present invention. Figure 2 ; Figure 11 This is a schematic diagram of the casing according to one or more embodiments of the present invention; Figure 12 This is a schematic diagram of the screw according to one or more embodiments of the present invention; Figure 13 This is a schematic diagram of the structure of a four-pin connector according to one or more embodiments of the present invention; The components represented by the various reference numerals in the diagram are: 1. Impact seat; 11. First mounting hole; 12. Second mounting hole; 13. Third mounting hole; 14. Fourth mounting hole; 15. Screw; 16. Impact point; 2. Acceleration ceramic; 3. First mass block; 31. Deformation groove; 4. Outer shell; 5. Base; 51. Core countersunk hole; 52. Wire hole; 53. Connector hole; 54. Fixing hole; 6. Force ceramic; 7. Nut; 71. Slot; 8. Four-core connector; 9. Screw. Detailed Implementation

[0022] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] Example 1 In a typical embodiment of the present invention, such as Figures 1-3 As shown, a lateral acceleration and force composite sensor is proposed, including: an impact base 1, an acceleration detection core, a housing 4, a base 5, a force detection core, a four-pin connector 8, and a screw 9. The acceleration detection core includes an acceleration ceramic 2 and a first mass block 3.

[0024] like Figure 6 and Figure 7 As shown, the impact seat 1, as the main force-bearing and core mounting component inside the sensor, has an overall cubic structure. An impact point 16 is fixedly set at the center of the top of the impact seat 1. The impact point 16 is a hemispherical protrusion used to bear the external impact load and transfer the load to the impact seat 1. A screw cylinder 15 is fixedly set at the center of the lower end of the impact seat 1. The screw cylinder 15 is used to install the force ceramic 6. The screw cylinder 15 is threadedly connected to the nut 7. The screw cylinder 15 adopts a four-part structure. By dividing it, a split structure that can produce shrinkage deformation is formed so that the force ceramic 6 set inside the screw cylinder 15 can be squeezed and fixed when the nut 7 is tightened.

[0025] The impact seat 1 has a first mounting hole 11, a second mounting hole 12, a third mounting hole 13, and a fourth mounting hole 14 on its side end. The first mounting hole 11, the second mounting hole 12, and the third mounting hole 13 are evenly spaced along the length of one side end face of the impact seat 1. All three holes extend laterally through the impact seat 1. The third mounting hole 13 is located between the first and second mounting holes 11 and 12. The third mounting hole 13 is a through hole, while the first and second mounting holes 11 and 12 are threaded holes. The other side of the impact seat 1... A fourth mounting hole 14 is provided at the center of one end face. The fourth mounting hole 14 penetrates the impact seat 1 laterally. The fourth mounting hole 14 is a threaded hole structure. The axis of the fourth mounting hole 14 is perpendicular to the axes of the first mounting hole 11, the second mounting hole 12 and the third mounting hole 13, and the fourth mounting hole 14 is connected to the first mounting hole 11, the second mounting hole 12 and the third mounting hole 13. Two oppositely arranged screws 9 are threaded into the first mounting hole 11, the second mounting hole 12 and the fourth mounting hole 14, which are used to fix and pre-tighten the corresponding acceleration detection core.

[0026] Specifically, acceleration detection cores are placed in both the third mounting hole 13 and the fourth mounting hole 14. A set of acceleration detection cores is placed at the center of the third mounting hole 13 and clamped and limited by two opposing screws 9 in the fourth mounting hole 14. Figure 12 As shown, a tool hole is provided on the screw 9; two sets of oppositely arranged acceleration detection cores are provided in the fourth mounting hole 14. The acceleration detection cores in the fourth mounting hole 14 are located outside the screw 9 in the fourth mounting hole 14. The two sets of acceleration detection cores in the fourth mounting hole 14 are clamped and limited by two screws 9 in the first mounting hole 11 and the second mounting hole 12, respectively.

[0027] The acceleration detection core includes an acceleration ceramic 2 and a first mass block 3. The acceleration ceramic 2 adopts a cylindrical structure and serves as the sensitive element for lateral acceleration detection. The first mass block 3 is sleeved on the outside of the acceleration ceramic 2 and cooperates with the acceleration ceramic 2 to form the acceleration detection core. Figure 8 As shown, the first mass block 3 has a cylindrical structure. A deformation groove 31 is provided on the inner wall of the first mass block 3. The deformation groove 31 extends along the axial direction of the first mass block 3. There are two deformation grooves 31 arranged opposite to each other, so that the first mass block 3 can produce a certain amount of slight deformation during the assembly pre-tightening process, thereby adapting to the assembly state of the acceleration ceramic 2 and making the extrusion pressure acting on the acceleration ceramic 2 more uniform. When the sensor is subjected to lateral acceleration, the first mass block 3 generates a corresponding lateral movement tendency under the action of inertia and transmits the inertial force to the acceleration ceramic 2, so that the acceleration ceramic 2 generates a corresponding charge signal to realize lateral acceleration detection.

[0028] In specific assembly, the acceleration ceramic 2 and the first mass block 3 are combined to form an acceleration detection core. One set of acceleration detection cores is installed in the third mounting hole 13 and clamped and fixed by two screws 9 in the fourth mounting hole 14. The other two sets of acceleration detection cores are installed in the fourth mounting hole 14 and clamped and fixed by two screws 9 in the first mounting hole 11 and the second mounting hole 12, respectively. The signal wires of each acceleration detection core are led out from the corresponding mounting hole. In this way, the acceleration detection core is set inside the impact seat 1 and arranged separately from the force detection area where the force detection core is located, thereby reducing the impact of structural deformation generated during force detection on acceleration detection.

[0029] It should be noted that the acceleration detection core inside the fourth mounting hole 14 does not contact the screw 9 inside the fourth mounting hole 14.

[0030] The impact seat 1 is set as a cubic structure with differentiated hole layout at both ends. One end has three holes and the other end has a single hole. The three holes are pressed by screws 9, which press the mass block and ceramic component at the corresponding hole positions respectively. The single hole end screw 9 is used to reverse the extrusion of the ceramic to build a multi-directional extrusion sensing structure. It can realize accurate detection of lateral acceleration in multiple dimensions such as front and back and left and right. The structure layout is compact and reasonable, with small structural coupling interference, which effectively improves the accuracy of lateral multi-dimensional detection and structural stability. The structure is simple and compact, and easy to disassemble and debug.

[0031] The force detection core includes a force ceramic 6, which is disposed inside the screw cylinder 15 at the lower end of the impact seat 1. The nut 7 is threadedly connected to the screw cylinder 15. Figure 9 and Figure 10 As shown, the nut 7 is generally cap-shaped, with an internal thread that mates with the screw barrel 15, and a groove 71 on the outside. The groove 71 is used to engage with the corresponding tooling during the tightening of the nut 7, so as to tighten the nut 7. As the nut 7 is screwed into the screw barrel 15, the split structure of the screw barrel 15 is deformed inward by the contraction of the nut 7, thereby compressing and fixing the internal force ceramic 6, so that the force ceramic 6 maintains a stable pre-tightened state.

[0032] The force sensing core structure, which uses a four-part screw barrel 15 to enclose the ceramic, differs from the traditional integral encapsulation structure. The screw barrel 15 is tightened by the nut 7 to compress the ceramic. When the nut 7 is subjected to longitudinal impact load, the screw barrel 15 can uniformly compress and deform the ceramic, accurately capture the mechanical change signal, and stably achieve high-precision detection of longitudinal force. This split encapsulation structure has uniform force distribution and sensitive deformation response, which can effectively avoid detection distortion caused by stress concentration. The structure is simple and reliable, with high assembly consistency, and balances force detection sensitivity and structural impact resistance.

[0033] The base 5 is located below the impact seat 1 and is used for mounting and supporting the force detection core, such as... Figure 4 and Figure 5 As shown, a core countersunk hole 51 is provided at the upper center of the base 5. The core countersunk hole 51 is used to position the screw barrel 15 and the force detection core inside it. The base 5 is also provided with a wire hole 52, which is used for the signal wires of each detection core to pass through. A connector hole 53 is provided on the side of the base 5 for installing a four-core connector 8. A fixing hole 54 is provided at the bottom of the base 5. The fixing hole 54 is a threaded hole structure for installing the composite sensor onto the device to be tested.

[0034] During assembly, the core structure consisting of impact seat 1, acceleration ceramic 2, first mass block 3, force ceramic 6, and nut 7 is installed onto base 5. The signal wires of each detection core are led out through wire hole 52 to connector hole 53. A four-core connector 8 is installed inside connector hole 53. Figure 13 As shown, the four-pin connector 8 has four conductive pins inside, and each pin is separated from the other by an insulating structure. Each signal wire is connected to the corresponding pin of the four-pin connector 8 to realize the connection of lateral acceleration signal, force signal and ground wire.

[0035] The outer shell 4 is located on the outside of the core structure, such as Figure 11 As shown, the outer shell 4 has a hollow shell structure. The upper and lower ends of the outer shell 4 are open and cooperate with the impact seat 1 and the base 5 to form a closed space, thereby protecting the internal acceleration detection core and force detection core. The outer shell 4 is welded and fixed to the impact seat 1 and the base 5 respectively, so that a relatively closed installation space is formed inside the sensor.

[0036] The acceleration detection core is embedded inside the impact seat 1 and arranged separately from the force detection core. They do not interfere with each other during the force operation, effectively eliminating the coupling interference problem of multi-parameter detection and ensuring the independent accuracy of acceleration and force detection. At the same time, the structure of the sensor base 5 is optimized and a central countersunk hole structure design is adopted, which can achieve rapid and accurate center positioning, improve assembly coaxiality and installation accuracy. In addition, the top impact position of the impact seat 1 adopts a hemispherical structure design, which can concentrate the force and evenly transfer the load, avoid local stress concentration, and significantly improve the uniformity of force, structural stability and dynamic detection accuracy of the sensor.

[0037] Example 2 In another typical embodiment of the present invention, a method for assembling a lateral acceleration and force composite sensor is proposed, comprising: Electrode layers are set on the corresponding surfaces of the acceleration ceramic 2 and the force ceramic 6, and signal wires are connected to them; the acceleration ceramic 2 and the first mass block 3 are combined to form an acceleration detection core; one set of acceleration detection cores is installed in the third mounting hole 13 and clamped and fixed by two screws 9 in the fourth mounting hole 14; the other two sets of acceleration detection cores are installed opposite to each other in the fourth mounting hole 14, so that the two sets of acceleration detection cores are distributed on both sides of the two screws 9 in the fourth mounting hole 14, and the two sets of acceleration detection cores in the fourth mounting hole 14 are clamped and fixed by two screws 9 in the first mounting hole 11 and the second mounting hole 12 respectively; the signal wires of each acceleration detection core are led out from the corresponding mounting hole. Next, the force ceramic 6 is installed inside the screw barrel 15, and the screw barrel 15 is tightened by the nut 7 to fix the force ceramic 6. Then, the assembled core structure is installed on the base 5, so that the screw barrel 15 is inserted into the core countersunk hole 51, and all signal wires are led out from the wire hole 52 and connected to the four-core connector 8 set in the connector hole 53. Finally, the outer shell 4 is installed on the outside of the impact seat 1 and welded to the impact seat 1 and the base 5 to complete the assembly of the composite sensor.

[0038] In use, the sensor is fixedly installed on the device to be tested through the fixing hole 54 on the base 5. When the impact point 16 on the top of the impact seat 1 is subjected to an external impact force, the impact load first acts on the impact seat 1 and is transmitted to the screw barrel 15 and the force ceramic 6 through the impact seat 1, so that the force ceramic 6 is subjected to the corresponding compressive force and generates an electric charge signal, thereby obtaining the impact force detection signal. At the same time, during the impact load process, the first mass block 3 is subjected to the inertial force in the lateral direction and transmits the corresponding inertial force to the acceleration ceramic 2, so that the acceleration ceramic 2 generates a corresponding electric charge signal, thereby obtaining the lateral acceleration detection signal.

[0039] Since the acceleration detection core formed by the acceleration ceramic 2 and the first mass block 3 is located inside the impact seat 1 and is arranged separately from the force ceramic 6 located in the screw barrel 15, the force interference between the two types of detection cores can be reduced. At the same time, the first mass block 3 has a certain flexible deformation capability through the deformation groove 31, which can buffer part of the pre-tightening stress during the assembly pre-tightening process, so that the acceleration ceramic 2 is subjected to a more uniform force. The screw barrel 15 adopts a split structure and is tightened and contracted by the nut 7, so that the force ceramic 6 can be squeezed and fixed more uniformly. Thus, the composite sensor can acquire the lateral acceleration signal and the impact force signal separately in the same structure, and improve the stability of the two types of detection signals.

[0040] By dividing the acceleration detection core and force detection core inside the impact seat 1 into zones, the structural coupling between the two types of detection parameters is reduced; the deformation groove 31 on the first mass block 3 improves the pre-tightening stress state of the acceleration ceramic 2; the screw cylinder 15 and the nut 7 cooperate to form a contractile fixation of the force ceramic 6; at the same time, the core countersunk hole 51 is used to position the internal core, thereby achieving synchronous detection of lateral acceleration and impact force under the condition of compact structure.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lateral acceleration and force composite sensor, comprising: The base (5) is characterized in that a cubic impact seat (1) is fixedly installed on the base (5), an impact point (16) is provided at the center of the top of the impact seat (1), and a force detection core is installed at the center of the lower end of the impact seat (1). The impact seat (1) has a first mounting hole (11), a second mounting hole (12), and a third mounting hole (13) spaced along its length on one side end face. The first mounting hole (11), the second mounting hole (12), and the third mounting hole (13) all penetrate the impact seat (1) laterally. The third mounting hole (13) is located between the first mounting hole (11) and the second mounting hole (12). The impact seat (1) has a fourth mounting hole (14) at the center of the other side end face. The axis of the fourth mounting hole (14) is parallel to the first mounting hole (11). The axes of the second mounting hole (12) and the third mounting hole (13) are perpendicular and connected. The first mounting hole (11), the second mounting hole (12) and the fourth mounting hole (14) are all threaded with two oppositely arranged screws (9). The third mounting hole (13) is provided with a set of acceleration detection cores and is clamped and limited by the screws (9) in the fourth mounting hole (14). The fourth mounting hole (14) is provided with two sets of acceleration detection cores and is clamped and limited by the screws (9) in the first mounting hole (11) and the second mounting hole (12) respectively.

2. The lateral acceleration and force composite sensor according to claim 1, characterized in that, The third mounting hole (13) is a through hole structure, while the first mounting hole (11), the second mounting hole (12) and the fourth mounting hole (14) are threaded hole structures.

3. The lateral acceleration and force composite sensor according to claim 1, characterized in that, A set of acceleration detection cores is placed at the center of the third mounting hole (13); the two sets of acceleration detection cores in the fourth mounting hole (14) are located outside the two screws (9) in the fourth mounting hole (14).

4. The lateral acceleration and force composite sensor according to claim 1, characterized in that, The impact point (16) is a hemispherical protrusion.

5. The lateral acceleration and force composite sensor according to claim 1, characterized in that, A screw cylinder (15) is fixedly installed at the lower center of the impact seat (1). The screw cylinder (15) has a four-part structure. The force detection core includes a force ceramic (6). The force ceramic (6) is installed inside the screw cylinder (15). The screw cylinder (15) is threadedly connected to a nut (7).

6. The lateral acceleration and force composite sensor according to claim 5, characterized in that, A core countersunk hole (51) is provided at the upper center of the base (5), and the screw (15) and nut (7) are inserted into the core countersunk hole (51).

7. The lateral acceleration and force composite sensor according to claim 6, characterized in that, The base (5) has a wire hole (52), the side of the base (5) has a connector hole (53) and a four-core connector (8) is installed, and the bottom of the base (5) has a fixing hole (54).

8. The lateral acceleration and force composite sensor according to claim 1, characterized in that, The acceleration detection core includes an acceleration ceramic (2) and a first mass block (3). Both the acceleration ceramic (2) and the first mass block (3) are cylindrical structures. The first mass block (3) is sleeved on the outside of the acceleration ceramic (2). The inner wall of the first mass block (3) is provided with two opposing deformation grooves (31).

9. The lateral acceleration and force composite sensor according to claim 1, characterized in that, The impact seat (1) is provided with a shell (4) on the outside. The upper and lower ends of the shell (4) are open. The shell (4) is fixedly connected to the impact seat (1) and the base (5).

10. A method for assembling a lateral acceleration and force composite sensor as described in any one of claims 5-7, characterized in that, include: One set of acceleration detection cores is installed in the third mounting hole (13) and clamped and fixed by two screws (9) in the fourth mounting hole (14); two sets of acceleration detection cores are installed opposite each other in the fourth mounting hole (14), so that the two sets of acceleration detection cores are distributed on the outside of the two screws (9) in the fourth mounting hole (14), and clamped and fixed by two screws (9) in the first mounting hole (11) and the second mounting hole (12) respectively; Install the force ceramic (6) into the screw barrel (15), tighten the screw barrel (15) by screwing the nut (7) to shrink it, then install the assembled impact seat (1) onto the base (5) so that the screw barrel (15) is inserted into the core countersunk hole (51), and finally fix the outer shell (4) on the outside of the impact seat (1).

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