Load measuring device and vehicle

Abstract

The invention provides a load measuring device and a vehicle, and the load measuring device comprises a housing; the transmitting coil is arranged in the shell and is used for generating an excitation magnetic field; at least one part of the movable part is located in the excitation magnetic field generated by the transmitting coil, and the movable part can rotate around the first axis to change the excitation magnetic field; the at least one receiving coil is arranged in the shell and is used for detecting the variation of the excitation magnetic field to generate an output signal; the linkage assembly is movably connected with the shell and is provided with a to-be-measured piece connecting end and a movable piece connecting end, the to-be-measured piece connecting end is connected with the to-be-measured piece, the movable piece connecting end extends into the shell to be connected with the movable piece, and the to-be-measured piece can move relative to the shell and can drive the linkage assembly to move relative to the shell; the linkage assembly can drive the movable part to rotate around the first axis. The output signal is used for representing the rotation angle information of the movable part, the rotation angle information is used for representing the weight information of the to-be-measured part, and the device has the advantages of high precision and strong anti-interference capability.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle load measurement, and more specifically, to a load measurement device and a vehicle having the load measurement device. Background Art

[0002] The load of a vehicle is an important parameter of the vehicle, which directly reflects the amount of cargo loaded on the vehicle. In order to obtain the load information of the vehicle in a timely manner, a load measuring device can be configured on the vehicle. Existing load measuring devices usually include magnets and induction coils, and use the Hall principle for measurement. The position of the magnet can change with the change of the vehicle's load, and the induction coil obtains the vehicle's load information by inducing the change of the magnetic field generated by the magnet. However, the existing load measuring devices have low accuracy and low sensitivity, and weak anti-interference ability, and are prone to measurement errors. Summary of the invention

[0003] One purpose of the present application is to provide a new technical solution for a load-bearing measuring device, which can at least solve one of the problems of low measurement accuracy, low sensitivity and weak anti-interference ability of load-bearing measuring devices in the prior art.

[0004] Another object of the present application is to provide a vehicle comprising the above-mentioned load measuring device.

[0005] According to a first aspect of the present application, a load measuring device is provided, comprising: a shell; a transmitting coil, arranged in the shell, and used to generate an excitation magnetic field; a movable part, at least a part of the movable part is located in the excitation magnetic field generated by the transmitting coil, and the movable part can rotate around a first axis to change the excitation magnetic field; at least one receiving coil, arranged in the shell, and used to detect the change in the excitation magnetic field to generate an output signal; a linkage component, the linkage component can be movably connected to the shell, the linkage component has a connection end for a part to be measured and a movable part connection end, the connection end for the part to be measured is connected to the part to be measured, the movable part connection end extends into the shell and is connected to the movable part, the part to be measured is movable relative to the shell and can drive the linkage component to move relative to the shell, and the linkage component can drive the movable part to rotate around the first axis; the output signal is used to represent the rotation angle information of the movable part, and the rotation angle information is used to represent the weight information of the part to be measured.

[0006] Optionally, the load measuring device further includes: a circuit board, wherein the circuit board is arranged in the shell, the transmitting coil and the receiving coil are respectively arranged on the circuit board, and the movable part is arranged on one side of the circuit board.

[0007] Optionally, the movable part is located opposite to the transmitting coil and the receiving coil.

[0008] Optionally, the number of the at least one receiving coil is two, each of the receiving coils is formed as a coil surrounded by a sine wave, the two receiving coils are coaxially arranged, and the sine waves of the two receiving coils are offset by a preset angle.

[0009] Optionally, the transmitting coil is formed as a toroidal coil coaxial with the receiving coil, and the transmitting coil is wound around the outer circumference of the receiving coil.

[0010] Optionally, the first axis coincides with an axis of the transmitting coil.

[0011] Optionally, the transmitting coil includes two layers of excitation coils, and the two layers of excitation coils have the same number of turns.

[0012] Optionally, the transmitting coil is arranged on a first side of the circuit board, the receiving coil is arranged on a second side of the circuit board, and a part of the receiving coil passes through the circuit board and is located on the first side of the circuit board.

[0013] Optionally, a positioning portion is provided on one of the housing and the circuit board. ( 113 / 114 ) , and the other is provided with a first matching portion, the positioning portion cooperates with the first matching portion to position the circuit board, and the positioning portion or the first matching portion is eccentrically arranged on the circuit board.

[0014] Optionally, the movable part includes: an annular sheet body, which is connected to the connecting end of the movable part and can rotate around the first axis; a plurality of blades, which are arranged on the outer peripheral surface of the annular sheet body 31 at intervals along the circumference of the annular sheet body, and can rotate around the first axis to cut the magnetic lines of force between the transmitting coil and the receiving coil.

[0015] Optionally, a raised portion is provided in the middle of the annular sheet body and raised toward one side along the thickness direction thereof, and the raised portion is connected to the connecting end of the movable member.

[0016] Optionally, a first end of the protrusion is connected to the annular sheet body, a second end of the protrusion is away from the annular sheet body, and a radial dimension of the protrusion gradually decreases from the first end to the second end.

[0017] Optionally, the protrusion is injection-moldedly connected to the connecting end of the movable part.

[0018] Optionally, the movable part is an integrally formed metal sheet.

[0019] Optionally, the shell defines a accommodating cavity, and the shell has a mounting channel connected to the accommodating cavity, the circuit board and the movable part are respectively arranged in the accommodating cavity, and the connecting end of the movable part passes through the mounting channel to be connected to the movable part.

[0020] Optionally, the shell is provided with a mounting column extending along the first axis, and the mounting channel is provided in the mounting column.

[0021] Optionally, the first end of the mounting post extends into the accommodating cavity and abuts against the circuit board, and the second end of the mounting post extends out of the housing.

[0022] Optionally, the linkage assembly includes: a first rod member, the first rod member is arranged in the installation channel, the first rod member extends axially along the first axis through the installation channel and into the accommodating cavity, the first rod member is rotatable around the first axis, and the first end of the first rod member constitutes a movable part connecting end connected to the movable part; a second rod member, the first end of the second rod member is connected to the second end of the first rod member, the second end of the second rod member constitutes a part to be measured connecting end connected to the part to be measured, and is driven by the part to be measured to rotate around the first axis.

[0023] Optionally, an outer wall surface of the first rod is provided with a mounting groove, and the load measuring device further comprises: a sealing ring, wherein the sealing ring is provided in the mounting groove to seal a gap between the first rod and the mounting column.

[0024] Optionally, a limiting portion is provided at the first end of the first rod, a limiting hole is provided at the shell, and the load measuring device further comprises: at least one limiting member, which passes through the limiting hole and cooperates with the limiting portion to limit the position of the first rod on the first axis.

[0025] Optionally, the limiting portion is arranged on the outer circumferential surface of the first rod, the limiting portion is formed as an annular groove extending along the circumference of the first rod, the limiting member is formed as a limiting rod, and the limiting rod passes through the limiting hole and is inserted into the annular groove.

[0026] Optionally, there are two limiting members, and the two limiting members are arranged in parallel on opposite sides of the first rod.

[0027] Optionally, the first rod member includes: a first rod segment, the first rod segment is arranged in the installation channel, the outer wall surface of the first rod segment is provided with the installation groove, the first end of the first rod segment faces the circuit board, and the second end of the first rod segment is connected to the second rod member; a second rod segment, the second rod segment is arranged at the second end of the first rod segment, the second rod segment is coaxially arranged with the first rod segment, and the outer diameter of the second rod segment is smaller than the outer diameter of the first rod segment, and the second rod segment is constructed to be suitable for connecting with the movable part.

[0028] Optionally, the first rod member further includes: a third rod segment, the third rod segment is arranged between the second rod segment and the movable member, a first end of the third rod segment is connected to the second rod segment, and a second end of the third rod segment is connected to the movable member.

[0029] Optionally, the first rod segment and the second rod segment are respectively formed as hollow columnar structures, and the first end of the third rod segment is provided with a hollow portion.

[0030] Optionally, the linkage assembly further includes: a swing arm ball head, which is arranged at the second end of the second rod; a third rod, the first end of the third rod 42 is movably connected to the swing arm ball head, and the second end of the third rod is connected to the object to be measured.

[0031] Optionally, the shell comprises: an outer shell, the accommodating cavity is defined in the outer shell, and the mounting channel is arranged in the outer shell; and a cover plate, the cover plate is connected to the outer shell to close the accommodating cavity.

[0032] Optionally, the cover plate is provided with a plurality of engaging portions, the housing is provided with a second matching portion corresponding one-to-one to the plurality of engaging portions, and the engaging portion is engaged with the second matching portion.

[0033] Optionally, the outer contour of the shell is a rectangle, and each top corner of the shell is provided with a mounting hole. The load measuring device also includes: a plurality of connecting parts, each of the connecting parts is respectively provided in the corresponding mounting hole and connected to the shell, and each of the connecting parts is respectively provided with a connecting hole suitable for connecting the connecting part to the outside.

[0034] Optionally, each of the connecting members is formed as a columnar metal ring, and the outer wall surface of each of the connecting members is provided with an annular groove extending along the circumference thereof.

[0035] According to a second aspect of the present application, a vehicle is provided, comprising: a frame; a load measuring device, the load measuring device being any one of the load measuring devices described in the above embodiments, the load measuring device being arranged on the frame; a cargo device, the cargo device being movably arranged on the frame, the cargo device being connected to the connecting end of the part to be measured of the linkage assembly.

[0036] According to the load-measuring device of the present application, a linkage assembly is provided to be connected to the movable part and the part to be measured respectively. Through the cooperation of the transmitting coil, the movable part and the receiving coil, and by utilizing the inductive principle, the movement of the part to be measured under the action of gravity can be converted into the rotation of the movable part through the linkage assembly, and then the output signal generated by the transmitting coil is changed by the rotation of the movable part to obtain the output signal for characterizing the rotation angle information of the movable part, and then the weight information of the part to be measured is obtained according to the rotation angle information. Compared with traditional magnets and induction coils, the load-measuring device of the present application has the advantages of higher measurement accuracy and sensitivity, and strong anti-interference ability. In addition, the load-measuring device of the present application has a simple structure and low cost.

[0037] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0039] Figure 1 is a perspective view of a load measuring device according to an embodiment of the present application;

[0040] Figure 2 is a stereoscopic diagram of a load measuring device according to an embodiment of the present application from another viewing angle;

[0041] Figure 3 is a cross-sectional view of a load measuring device according to an embodiment of the present application;

[0042] Figure 4 is a perspective view of a housing of a load measuring device according to an embodiment of the present application;

[0043] Figure 5 is a three-dimensional diagram of a first rod, a second rod and a movable member of a load measuring device according to an embodiment of the present application;

[0044] Figure 6 is a perspective view of a partial structure of a load measuring device according to an embodiment of the present application;

[0045] Figure 7 is a three-dimensional diagram of a cover plate of a load measuring device according to an embodiment of the present application;

[0046] Figure 8 is an exploded view of a load measuring device according to an embodiment of the present application;

[0047] Fig. 9is a three-dimensional diagram of a housing and a circuit board of a load measuring device according to an embodiment of the present application;

[0048] Fig.10 is a three-dimensional diagram of a housing and a circuit board of a load measuring device according to another embodiment of the present application;

[0049] Fig.11 is a schematic structural diagram of a transmitting coil, a movable part and a receiving coil of a load measurement device according to an embodiment of the present application;

[0050] Fig.12 is a schematic structural diagram of a transmitting coil and a receiving coil according to an embodiment of the present application;

[0051] Fig.13 is a schematic structural diagram of a transmitting coil, a receiving coil and a circuit board of a load measurement device according to an embodiment of the present application;

[0052] Fig.14 is a schematic diagram of mechanical angles and electrical angles of a load measurement device according to an embodiment of the present application;

[0053] Fig.15 It is a schematic diagram of a voltage signal output by a load measurement device according to an embodiment of the present application.

[0054] Reference numerals

[0055] Load measuring device 100;

[0056] First axis 1;

[0057] Shell 10; housing 11; accommodating cavity 111; mounting channel 112; guide column 113; convex portion 114; buckle male end 115; reinforcing rib 116; connecting port 117; limiting hole 118; mounting groove 119; cover plate 12; buckle female end 121; circuit board 13; guide hole 131; guide groove 132; connector 14; annular groove 141; connecting hole 142; pin 15; mounting column 16; mounting hole 17;

[0058] Transmitting coil 21; movable part 30; annular sheet 31; blade 32; raised portion 33;

[0059] The second rod 41; the third rod 42; the first rod 43; the first rod section 431; the second rod section 432; the third rod section 433; the limiting portion 44; the sealing ring 45;

[0060] A first receiving coil 51; a second receiving coil 52; a control chip 53;

[0061] Limiting member 60;

[0062] Swing arm ball head 70;

[0063] Ball stud 80. DETAILED DESCRIPTION

[0064] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0065] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0066] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0067] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0068] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0069] Below we first combine the attached Figures 1 to 15 The load measurement device 100 according to the embodiment of the present application is described in detail.

[0070] The load measurement device 100 according to the embodiment of the present application includes: a housing 10, a transmitting coil 21, a movable part 30, at least one receiving coil and a linkage assembly.

[0071] Specifically, the transmitting coil 21 is arranged in the shell 10, and is used to generate an excitation magnetic field. At least a part of the movable part 30 is located in the excitation magnetic field generated by the transmitting coil 21, and the movable part 30 can rotate around the first axis 1 to change the excitation magnetic field. The receiving coil is arranged in the shell 10, and is used to detect the change in the excitation magnetic field to generate an output signal. The linkage component is movably connected to the shell 10, and the linkage component has a connection end of the part to be measured and a connection end of the movable part. The connection end of the part to be measured is connected to the part to be measured, and the connection end of the movable part extends into the shell 10 and is connected to the movable part 30. The part to be measured is movable relative to the shell 10 and can drive the linkage component to move relative to the shell 10. The linkage component can drive the movable part 30 to rotate around the first axis 1; the output signal is used to represent the rotation angle information of the movable part 30, and the rotation angle information is used to represent the weight information of the part to be measured.

[0072] In other words, the load measuring device 100 according to the embodiment of the present application is mainly composed of a housing 10, a transmitting coil 21, a movable part 30, at least one receiving coil and a linkage assembly. The load measuring device 100 of the present application can be arranged on the frame of a vehicle to measure the load of the vehicle, and the part to be measured can be a cargo device on a truck. For example, the load measuring device 100 can be arranged on the frame of a truck, and the cargo device can be a cargo box of a truck, and the weight of the cargo transported by the truck can be measured by the load measuring device 100.

[0073] The housing 10 may be disposed on the vehicle frame, and the housing 10 may define a receiving chamber 111. The receiving chamber 111 may contain a transmitting coil 21 and a receiving coil, and the housing 10 may protect the transmitting coil 21 and the receiving coil to prevent the transmitting coil 21 and the receiving coil from being exposed.

[0074] The transmitting coil 21 can generate an excitation magnetic field when powered on, and the excitation magnetic field can be a high-frequency magnetic field. The transmitting coil 21 can transmit an output signal through the excitation magnetic field.

[0075] A part or all of the movable part 30 may be located in the excitation magnetic field generated by the transmitting coil 21. The movable part 30 may rotate relative to the transmitting coil 21, and the rotation axis of the movable part 30 may be the first axis 1. When the movable part 30 rotates to different positions, it may have different effects on the excitation magnetic field to change the excitation magnetic field. That is, when the position of the movable part 30 changes, the excitation magnetic field may change accordingly, so that the magnetic flux at the receiving coil changes.

[0076] The number of receiving coils can be one or more. The receiving coil can detect the change in the excitation magnetic field and generate an output signal according to the change. Specifically, the receiving coil can generate an induced electromotive force in the excitation magnetic field. After the movable part 30 rotates, the magnetic flux at the receiving coil will change, thereby changing the induced electromotive force generated by the receiving coil, thereby affecting the output voltage of the receiving coil. The output voltage can be formed into an output signal, and the rotation angle information of the part to be measured can be obtained according to the output voltage.

[0077] In addition, the linkage assembly is movably connected to the housing 10. One end of the linkage assembly can be formed as a connection end of the piece to be measured, which can be connected to the piece to be measured, and the other end of the linkage assembly can be formed as a movable piece connection end, which can be connected to the movable piece 30. The piece to be measured can move relative to the frame under the action of its own gravity to change the distance between the piece to be measured and the frame. When the piece to be measured moves relative to the frame, the linkage assembly can be moved relative to the housing 10, thereby driving the movable piece 30 to rotate around the first axis 1 through the linkage assembly.

[0078] For example, the frame can be a frame of a truck, the cargo box or cargo compartment of the truck can be formed as the part to be measured, the first end of the linkage assembly can be fixedly connected to the cargo box or cargo compartment of the truck, and the shell 10 can be fixedly connected to the frame.

[0079] It should be noted that there is a one-to-one correspondence between the weight of the part to be measured and the distance between the part to be measured and the frame, and there is a one-to-one correspondence between the distance between the part to be measured and the frame and the rotation angle of the movable part 30. The receiving coil can obtain the corresponding induced electromotive force according to the change of the excitation magnetic field, that is, generate an output signal, and the rotation angle of the movable part 30 can be obtained according to the output signal, and then the distance between the part to be measured and the frame can be calculated according to the rotation angle of the movable part 30, and the weight of the part to be measured can be further calculated. Therefore, the weight information of the part to be measured can be obtained through the rotation angle information.

[0080] Therefore, according to the load-measuring device 100 of the present application, a linkage assembly is provided to be connected to the movable part 30 and the part to be measured respectively, and through the cooperation of the transmitting coil 21, the movable part 30 and the receiving coil, by utilizing the inductive principle, the movement of the part to be measured under the action of gravity can be converted into the rotation of the movable part 30 through the linkage assembly, and then the output signal generated by the transmitting coil 21 is changed by the rotation of the movable part 30, and the output signal for characterizing the rotation angle information of the movable part 30 is obtained, and then the weight information of the part to be measured is obtained according to the rotation angle information. Compared with traditional magnets and induction coils, the load-measuring device 100 of the present application has the advantages of higher measurement accuracy and sensitivity, and strong anti-interference ability. In addition, the load-measuring device 100 of the present application has a simple structure and low cost.

[0081] In some specific embodiments, the transmitting coil 21 can be a symmetrical closed coil. When the transmitting coil 21 is connected to high-frequency alternating current, the circuits in the transmitting coil 21 are distributed in a positive and negative order, and a uniformly distributed alternating magnetic field can be generated near the transmitting coil 21, and the alternating magnetic field is the excitation magnetic field. The induced voltage E induced by electromagnetic induction in the receiving coil in this excitation magnetic field. Due to the symmetrical relationship, through the design of the receiving coil, when the movable part 30 is not in the excitation magnetic field generated by the transmitting coil 21, the induced electrical signals on the receiving coil can cancel each other, and the receiving coil can theoretically have no induced electrical signal, and the induced voltage E is in a state of mutual balance.

[0082] When the movable part 30 exists in the excitation magnetic field generated by the transmitting coil 21, the movable part 30 can induce an induced voltage, which is of the same frequency as the excitation signal in the transmitting coil 21. Therefore, the movable part 30 also generates a changing magnetic field, which is opposite to the direction of the excitation magnetic field generated by the transmitting coil 21, and weakens the magnetic field signal received by the receiving coil in the coverage area of ​​the movable part 30. At this time, the original balance of the receiving coil is destroyed, and an induced electrical signal is generated. When the position of the movable part 30 is different, that is, the angle of rotation of the movable part 30 is different, the induced electrical signal generated in the receiving coil is different, that is, the output signal generated by the receiving coil is different. Therefore, by detecting the phase value of the envelope waveform of the induced electrical signal, the rotation angle information of the movable part 30 can be obtained.

[0083] In some specific embodiments of the present application, the load measuring device 100 also includes a circuit board 13, which is disposed in the housing 10, the transmitting coil 21 and the receiving coil are respectively disposed on the circuit board 13, and the movable part 30 is disposed on one side of the circuit board 13.

[0084] Specifically, the circuit board 13 can be accommodated in the accommodating cavity 111 of the housing 10. The circuit board 13 can be used to carry and set the transmitting coil 21 and the receiving coil. It should be noted that the transmitting coil 21 or the receiving coil can be set on the surface of the circuit board 13 or in the circuit board 13, which is not limited here.

[0085] In this embodiment, by providing a circuit board 13 to carry the transmitting coil 21 and the receiving coil, the structure of the load measuring device 100 can be made more compact, and the production of the load measuring device 100 is also convenient.

[0086] According to some other embodiments of the present application, the movable member 30 is opposite to the transmitting coil 21 and the receiving coil. For example, the movable member 30 may be directly opposite to the transmitting coil 21 and the receiving coil. By setting the movable member 30 to be opposite to the transmitting coil 21 and the receiving coil, the influence of the movable member 30 on the excitation magnetic field when rotating can be enhanced, thereby improving the sensitivity of the load measurement device 100.

[0087] In some specific embodiments of the present application, the number of at least one receiving coil is two, each receiving coil is formed as a coil surrounded by a sine wave, the two receiving coils are coaxially arranged, and the sine waves of the two receiving coils are offset by a preset angle.

[0088] Specifically, the load measurement device 100 of this embodiment may include two receiving coils. The axes of the two receiving coils may coincide. Each receiving coil may be surrounded by a line in a sinusoidal waveform. For ease of description, the two receiving coils may be defined as a first receiving coil 51 and a second receiving coil 52.

[0089] like Fig.11 and Fig.12 As shown, due to the preset angle offset between the sine waves of the first receiving coil 51 and the second receiving coil 52, the magnetic flux density at the receiving coil covered by the movable part 30 will be smaller than the magnetic flux at the uncovered receiving coil, thereby causing the induced electromotive force of the two receiving coils to change, and further causing the voltage output by the two receiving coils to change.

[0090] Specifically, the rotation angle of the movable member 30 corresponds to the voltage output by the two receiving coils, and the voltage output by the two receiving coils will change when the movable member 30 is at different positions.

[0091] The transmitting coil 21 and the receiving coil can be connected to the control chip 53, and the control chip 53 can calculate and obtain weight information based on the output signal generated by the receiving coil. The control chip 53 can synchronously demodulate and filter the voltage output by the two receiving coils to obtain the following: Fig.15 The sine voltage signal Vsin and cosine voltage signal Vcos are shown. Then the control chip 53 performs arc tangent analysis on the processed Vsin and Vcos to obtain the angular position of the active part 30 represented by the current output voltage, and then converts the angular position information into a PWM signal and outputs it to the MCU for further weight conversion and analysis processing to obtain the load information of the part to be measured.

[0092] According to some other embodiments of the present application, the transmitting coil 21 is formed as a toroidal coil coaxial with the receiving coil, and the transmitting coil 21 is wound around the outer circumference of the receiving coil. In other words, the receiving coil is surrounded by the transmitting coil 21 so that the receiving coil can generate an induced electromotive force in the excitation magnetic field. By setting the transmitting coil 21 coaxial with the receiving coil, the corresponding relationship between the output signal generated by the receiving coil and the change in the excitation magnetic field can be made more regular, which facilitates the acquisition of weight information.

[0093] Optionally, the transmitting coil 21 may be in a ring shape.

[0094] According to some optional embodiments of the present application, the first axis 1 coincides with the axis of the transmitting coil 21, that is, the movable part 30 can rotate around the axis of the transmitting coil 21, so that the movable part 30 rotates around the central symmetry line of the excitation magnetic field when rotating, which is beneficial for the movable part 30 to change the excitation magnetic field according to a predetermined rule during the rotation process, thereby facilitating the acquisition of accurate weight information.

[0095] In some specific implementations of the present application, the transmitting coil 21 includes two layers of excitation coils, and the two layers of excitation coils have the same number of turns.

[0096] By setting two layers of excitation coils with the same number of turns, the strength of the generated excitation magnetic field can be enhanced, so that the signal received by the receiving coil is stronger, and it is beneficial to increase the wiring range of the receiving coil and facilitate the wiring of the receiving coil on the circuit board 13.

[0097] Optionally, two layers of excitation coils may be distributed at intervals along the extension direction of the first axis 1 .

[0098] According to some optional embodiments of the present application, the transmitting coil 21 is disposed on the first side of the circuit board 13 , the receiving coil is disposed on the second side of the circuit board 13 , and a portion of the receiving coil passes through the circuit board 13 and is located on the first side of the circuit board 13 .

[0099] Specifically, if Fig.13 As shown, the circuit board 13 may have two side surfaces in the extension direction of the first axis 1, namely, a first side surface and a second side surface. The transmitting coil 21 may be disposed on the first side surface of the circuit board 13, and the receiving coil may be disposed on the second side surface of the circuit board 13. In addition, a portion of the receiving coil may pass through the circuit board 13 and extend to the first side surface of the circuit board 13, so as to facilitate winding of the two receiving coils on the circuit board 13.

[0100] According to one embodiment of the present application, a positioning portion is provided on one of the shell 10 and the circuit board 13, and a first matching portion is provided on the other. The positioning portion cooperates with the first matching portion to position the circuit board 13, and the positioning portion or the first matching portion is eccentrically arranged on the circuit board 13.

[0101] Since the positioning portion or the first matching portion is eccentrically arranged on the circuit board 13, when assembling the circuit board 13, the front and back sides of the circuit board 13 can be determined by matching the positioning portion with the first matching portion, thereby preventing the circuit board 13 from being incorrectly installed on the housing 11. It should be noted that the eccentric arrangement may refer to an arrangement at a position other than the center of the circuit board 13.

[0102] Alternatively, if Fig. 9 As shown, the positioning portion can be a guide column 113 arranged on the housing 11, and the guide column 113 extends toward the circuit board 13. The first matching portion can be a guide hole 131 arranged on the circuit board 13. The guide hole 131 can be eccentrically arranged on the circuit board 13. The position of the guide column 113 can correspond to the position of the guide hole 131. During assembly, the guide column 113 can be inserted into the guide hole 131 to complete the positioning of the circuit board 13.

[0103] In some other embodiments, such as Fig.10As shown, the positioning portion can be a protrusion 114 arranged on the housing 11, and the protrusion 114 extends toward the circuit board 13. The first matching portion can be a guide groove 132 arranged on the edge of the circuit board 13. The position of the protrusion 114 can correspond to the position of the guide groove 132. During assembly, the protrusion 114 can be inserted into the guide groove 132 to complete the positioning of the circuit board 13.

[0104] According to some other embodiments of the present application, the movable member 30 includes: an annular sheet 31 and a plurality of blades 32. The annular sheet 31 is connected to the movable member connection end, and the annular sheet 31 is rotatable around the first axis 1. The plurality of blades 32 are arranged on the outer peripheral surface of the annular sheet 31 at intervals along the circumference of the annular sheet 31, and the blades 32 are rotatable around the first axis 1 to cut the magnetic flux lines between the transmitting coil 21 and the receiving coil.

[0105] Specifically, the movable member 30 may be in a sheet shape, and the movable member 30 may be mainly composed of an annular sheet body 31 and a plurality of blades 32, wherein the annular sheet body 31 may be fixed to the movable member connection end, and move synchronously with the movable member connection end, and the annular sheet body 31 may rotate around the first axis 1. The axis of the annular sheet body 31 may coincide with the first axis 1.

[0106] A plurality of blades 32 may be arranged at intervals on the outer circumferential surface of the annular sheet body 31, and the plurality of blades 32 may be arranged along the circumference of the annular sheet body 31. Each blade 32 may rotate about the first axis 1 to cut the magnetic flux lines of the excitation magnetic field. There may be gaps between adjacent blades 32, so that during the rotation of the movable member 30, the blades 32 and the gaps correspond to different positions of the two receiving coils, so that the induced electromotive forces generated by the two receiving coils are different.

[0107] Optionally, the number of blades 32 may be four, so as to divide the measuring interval of the receiving coil into four parts, so that the load measuring device 100 generates the following information within a mechanical cycle of 0-360°: Fig.14 The electrical angles of the four cycles shown are used to improve the measurement accuracy of the load measurement device 100. According to actual measurement requirements, the angle measurement interval of the load measurement device 100 can be 50°, and the corresponding PWM output is 5% to 95%.

[0108] In some specific embodiments of the present application, a raised portion 33 is provided in the middle of the annular sheet body 31 and is raised toward one side along the thickness direction thereof, and the raised portion 33 is connected to the connecting end of the movable part.

[0109] Specifically, the protrusion 33 can protrude from the inner wall surface of the annular sheet 31 toward the side away from the circuit board 13. By setting the protrusion 33 to be connected to the movable part connection end of the linkage assembly, the reliability of the connection between the movable part 30 and the linkage assembly is facilitated.

[0110] According to some optional embodiments of the present application, the first end of the protrusion 33 is connected to the annular sheet body 31, the second end of the protrusion 33 is away from the annular sheet body 31, and the radial dimension of the protrusion 33 gradually decreases from the first end to the second end.

[0111] For example, the protrusion 33 may be a hollow conical structure. The radial dimension of the end of the protrusion 33 connected to the annular sheet 31 is larger, and the radial dimension of the end of the protrusion 33 away from the annular sheet 31 is smaller. By setting the radial dimension of the protrusion 33 to gradually decrease from the first end to the second end, the protrusion 33 can be firmly embedded in the movable part connection end of the linkage assembly, further improving the reliability of the connection between the movable part 30 and the linkage assembly.

[0112] According to some other embodiments of the present application, the protrusion 33 is connected to the movable part connection end by injection molding. Specifically, the movable part connection end can be formed by injection molding, and when the movable part connection end is injection molded, the protrusion 33 of the movable part 30 can be preset in the injection mold, so that the protrusion 33 is connected to the movable part connection end by injection molding, which is beneficial to improve the reliability of the connection between the movable part 30 and the linkage assembly and reduce the risk of the movable part 30 falling off.

[0113] In some specific embodiments of the present application, the movable part 30 is an integrally formed metal sheet. Setting the movable part 30 as a sheet-like structural part made of metal can enable the movable part 30 to more efficiently cut the magnetic flux lines in the excitation magnetic field during rotation, thereby having a stronger impact on the excitation magnetic field.

[0114] According to some optional embodiments of the present application, the shell 10 defines a accommodating cavity 111, and the shell 10 has an installation channel 112 connected to the accommodating cavity 111, the circuit board 13 and the movable part 30 are respectively arranged in the accommodating cavity 111, and the connecting end of the movable part passes through the installation channel 112 to be connected to the movable part 30.

[0115] Specifically, the circuit board 13, the transmitting coil 21 and the receiving coil may be accommodated in the accommodating cavity 111. The accommodating cavity 111 may be communicated with the outside through a mounting channel 112 that penetrates the inner and outer side walls of the housing 10.

[0116] The movable member 30 may be disposed in the accommodating cavity 111 , and the movable member connecting end of the linkage assembly may pass through the mounting channel 112 and extend into the accommodating cavity 111 , so that the movable member connecting end may be connected to the movable member 30 .

[0117] In this embodiment, by providing the installation channel 112 , an installation space can be provided for the connection between the linkage assembly and the movable part 30 , so that the movable part 30 can be accommodated in the housing 10 , and the housing 10 is used to protect the movable part 30 .

[0118] According to some other embodiments of the present application, the housing 10 is provided with a mounting column 16 extending along the first axis 1 , and a mounting channel 112 is provided in the mounting column 16 .

[0119] Specifically, the mounting post 16 can be disposed on the housing 10 and protrude outward from the outer surface of the housing 10 along the extension direction of the first axis 1. The mounting channel 112 can extend along the first axis 1 and be coaxially disposed with the mounting post 16 to simplify the processing of the housing 10. By disposing the mounting channel 112 in the mounting post 16, the volume of the housing 10 can also be reduced, which is conducive to miniaturization of the load measurement device 100.

[0120] In some specific embodiments of the present application, the first end of the mounting post 16 extends into the accommodating cavity 111 and abuts against the circuit board 13 , and the second end of the mounting post 16 extends out of the housing 10 .

[0121] The first end of the mounting post 16 is arranged to abut against the circuit board 13, and the mounting post 16 can be used to limit and fix the circuit board 13 to prevent the circuit board 13 from approaching the movable part 30 along the extension direction of the first axis 1, so that the positions of the transmitting coil 21 and the receiving coil on the circuit board 13 can be fixed to prevent the transmitting coil 21 and the receiving coil from approaching the movable part 30, thereby ensuring the stability and reliability of the coordination between the transmitting coil 21, the movable part 30 and the receiving coil, and further ensuring the measurement accuracy of the load measuring device 100.

[0122] The second end of the mounting column 16 is arranged to extend out of the housing 10, so that the length of the mounting channel 112 provided in the mounting column 16 in the extension direction of the first axis 1 can be increased, thereby increasing the length of the connecting end of the movable part and the length extending into the housing 10, thereby improving the reliability of the movable connection between the linkage assembly and the housing 10.

[0123] According to some optional embodiments of the present application, the linkage assembly includes: a first rod 43 and a second rod 41 .

[0124] The first rod 43 is disposed in the installation channel 112. The first rod 43 extends along the axial direction of the first axis 1 through the installation channel 112 and into the accommodating cavity 111. The first rod 43 is rotatable around the first axis 1. The first end of the first rod 43 constitutes a movable member connecting end connected to the movable member 30. The first end of the second rod 41 is connected to the second end of the first rod 43. The second end of the second rod 41 constitutes a member connecting end to be measured connected to the member to be measured, and is driven by the member to be measured to rotate around the first axis 1.

[0125] Specifically, the first rod 43 can be coaxially arranged in the installation channel 112 , and the first rod 43 can extend into the accommodating cavity 111 through the installation channel 112 , so that the first end of the first rod 43 can be connected to the movable member 30 accommodated in the accommodating cavity 111 .

[0126] The first rod 43 can rotate around the first axis 1 to drive the movable member 30 to rotate around the first axis 1. The first rod 43 can be adapted to the installation channel 112.

[0127] The second rod 41 has a first end and a second end in its length direction. The first end of the second rod 41 can be connected to the second end of the first rod 43, and the second end of the second rod 41 can be connected to the object to be measured. It should be noted that the connection between the second rod 41 and the object to be measured can be a direct connection or an indirect connection, which is not limited here.

[0128] When the weight of the object to be measured changes, the second rod 41 can be driven to rotate around the first axis 1 , thereby causing the second rod 41 to drive the first rod 43 and the movable member 30 to rotate around the first axis 1 .

[0129] According to some other embodiments of the present application, the outer wall surface of the first rod 43 is provided with a mounting groove 119 , and the load measuring device 100 further includes a sealing ring 45 , which is provided in the mounting groove 119 to seal the gap between the first rod 43 and the mounting column 16 .

[0130] Specifically, the first rod 43 and the inner wall surface of the mounting column 16 can be sealed by a sealing ring 45. A portion of the sealing ring 45 can be accommodated in the mounting groove 119 on the outer wall surface of the first rod 43, and another portion of the sealing ring 45 can abut against the inner wall surface of the mounting column 16 to form a seal, so as to play a dustproof role and prevent foreign matter such as dust from entering the accommodating cavity 111 to affect the measurement results.

[0131] In some specific embodiments of the present application, a limiting portion 44 is provided at the first end of the first rod member 43, a limiting hole 118 is provided at the shell 10, and the load measuring device 100 further includes at least one limiting member 60, which passes through the limiting hole 118 and cooperates with the limiting portion 44 to limit the position of the first rod member 43 on the first axis 1.

[0132] Specifically, the housing 10 may be provided with a limiting hole 118, which may extend in a direction perpendicular to the first axis 1. A portion of the limiting hole 118 may pass through the mounting channel 112 and form a groove in the mounting channel 112. One end of the limiting hole 118 may pass through the outer surface of the housing 10 to form an opening, so that the limiting member 60 may extend into the limiting hole 118 from the opening.

[0133] The limiting portion 44 on the first end of the first rod 43 may correspond to the position of the limiting hole 118. The limiting member 60 may extend into the installation channel 112 through the limiting hole 118. The portion of the limiting member 60 extending into the installation channel 112 may cooperate with the limiting portion 44 to limit the position of the first rod 43 in the extension direction of the first axis 1, thereby preventing the first rod 43 from moving in the extension direction of the first axis 1, while not affecting the rotation of the first rod 43 around the first axis 1.

[0134] According to some optional embodiments of the present application, the limiting portion 44 is arranged on the outer peripheral surface of the first rod member 43, and the limiting portion 44 is formed as an annular groove extending along the circumference of the first rod member 43. The limiting member 60 is formed as a limiting rod, and the limiting rod passes through the limiting hole 118 and is inserted into the annular groove.

[0135] For example, Figure 3 As shown, the limiting portion 44 may be an annular groove, and the first rod 43 may be a columnar structure. The annular groove may extend around the circumference of the first rod 43 and surround the outer circumference of the first rod 43. The limiting rod may be adapted to the limiting hole 118. A portion of the limiting rod may be accommodated in the limiting hole 118, and another portion of the limiting rod may be inserted into the annular groove, so that the limiting rod limits the movement of the first rod 43 in the extension direction of the first axis 1. In addition, the structure of the annular groove can also ensure that the limiting rod does not affect the rotation of the first rod 43 around the first axis 1 while limiting.

[0136] According to some other embodiments of the present application, there are two limiting members 60 , and the two limiting members 60 are arranged in parallel on opposite sides of the first rod 43 .

[0137] Specifically, the two limiting members 60 may be two limiting rods, and the two limiting rods may be spaced apart and parallel to each other. Figure 3 As shown, one of the two limiting rods may be located on the left side of the first rod 43 , and the other of the two limiting rods may be located on the right side of the first rod 43 .

[0138] In this embodiment, two limit members 60 are provided to improve the reliability of the limit members 60 limiting the first rod 43 , thereby preventing the first rod 43 from being offset or transmitted, and effectively ensuring the reliability and accuracy of the load measurement device 100 .

[0139] Optionally, the two limiting rods may extend respectively along the radial direction of the cylindrical first rod 43. The two limiting rods may be centrally symmetrically arranged with respect to the first axis 1.

[0140] In some specific embodiments of the present application, the first rod member 43 includes a first rod segment 431 and a second rod segment 432 .

[0141] The first rod segment 431 is disposed in the installation channel 112, and the outer wall surface of the first rod segment 431 is provided with a mounting groove 119. The first end of the first rod segment 431 faces the circuit board 13, and the second end of the first rod segment 431 is connected to the second rod member 41. The second rod segment 432 is disposed at the second end of the first rod segment 431, and the second rod segment 432 is coaxially arranged with the first rod segment 431, and the outer diameter of the second rod segment 432 is smaller than the outer diameter of the first rod segment 431, and the second rod segment 432 is configured to be suitable for connecting with the movable member 30.

[0142] Specifically, the first rod 43 may include at least two rod segments with different diameters, namely a first rod segment 431 and a second rod segment 432. The first rod segment 431 may be accommodated in the installation channel 112. The installation groove 119 for installing the sealing ring 45 may be arranged on the outer wall surface of the first rod segment 431.

[0143] like Figure 3 As shown, the first end of the first rod segment 431 may be the lower end of the first rod segment 431, and the lower end of the first rod segment 431 may face the circuit board 13. The second end of the first rod segment 431 may be the upper end of the first rod segment 431. The lower end of the first rod segment 431 may be fixedly connected to the first end of the second rod member 41.

[0144] The second rod segment 432 may be coaxially disposed at the first end of the first rod segment 431. The shape and size of the second rod segment 432 may be suitable for connecting the movable member 30. The outer diameter of the second rod segment 432 may be smaller than the outer diameter of the first rod segment 431 to reduce the overall volume of the first rod member 43, which is beneficial to reducing the material required for manufacturing the first rod member 43 and reducing the cost of the load measurement device 100.

[0145] According to some optional embodiments of the present application, the first rod member 43 also includes a third rod segment 433, which is arranged between the second rod segment 432 and the movable member 30, the first end of the third rod segment 433 is connected to the second rod segment 432, and the second end of the third rod segment 433 is connected to the movable member 30.

[0146] Specifically, the second rod segment 432 is away from one end of the first rod segment 431, that is, Figure 3 A third rod segment 433 may be provided at the lower end of the second rod segment 432. Figure 3 As shown, the upper end of the third rod segment 433 can be connected to the second rod segment 432, and the lower end of the third rod segment 433 can be connected to the movable member 30. Optionally, the outer diameter of the third rod segment 433 can be smaller than the outer diameter of the second rod segment 432 to further reduce the volume of the first rod member 43, which is more conducive to achieving lightweight load measurement device 100.

[0147] According to some other embodiments of the present application, the first rod segment 431 and the second rod segment 432 are respectively formed as hollow columnar structures, and the first end of the third rod segment 433 is provided with a hollow portion.

[0148] like Figure 3 As shown, the first rod segment 431 and the second rod segment 432 may have cavities therein, and the cavities may penetrate the first rod segment 431 and the second rod segment 432 along the extension direction of the first axis 1. The third rod segment 433 may have a hollow portion at one end close to the second rod segment 432, and the hollow portion may communicate with the cavities in the first rod segment 431 and the second rod segment 432.

[0149] In this embodiment, the first rod segment 431 and the second rod segment 432 are respectively set as hollow columnar structures, and the first end of the third rod segment 433 is set to have a hollow portion, which can further reduce the volume of the first rod member 43 and reduce the material required to manufacture the first rod member 43, which is beneficial to reducing the cost and weight of the load measuring device 100.

[0150] In some specific embodiments of the present application, the linkage assembly further includes a swing arm ball head 70 and a third rod 42 .

[0151] The swing arm ball head 70 is disposed at the second end of the second rod 41. The first end of the third rod 42 is movably connected to the swing arm ball head 70, and the second end of the third rod 42 is connected to the object to be measured.

[0152] Specifically, the second rod 41 and the third rod 42 can be movably connected via the swing arm ball head 70, so that the second rod 41 and the third rod 42 can rotate around the connection between them. The third rod 42 can rotate under the drive of the object to be measured, thereby driving the second rod 41 to rotate.

[0153] The swing arm ball head 70 can be integrally formed with the second rod 41, the first end of the third rod 42 can be provided with a first spherical groove matched with the swing arm ball head 70, a ball stud 80 can be connected to the object to be measured, and the second end of the third rod 42 can be provided with a second spherical groove matched with the ball stud 80. The second end of the third rod 42 can be rotatably connected to the object to be measured through the ball stud 80.

[0154] In other words, the second rod 41 and the third rod 42 may constitute a connecting rod assembly to drive the first rod 43 to rotate around the first axis 1 .

[0155] According to some optional embodiments of the present application, the housing 10 includes: an outer shell 11 and a cover plate 12 .

[0156] An accommodating cavity 111 is defined in the housing 11 . A mounting channel 112 is provided in the housing 11 . The cover plate 12 is connected to the housing 11 to close the accommodating cavity 111 .

[0157] Specifically, the shell 11 may be provided with an opening connected to the accommodating cavity 111 in the shell 11, and the opening may be covered with a cover plate 12. By arranging the shell 11 and the cover plate 12 to cooperate with each other, the assembly between the circuit board 13, the transmitting coil 21 and the receiving coil and the shell 11 can be facilitated.

[0158] According to some other embodiments of the present application, a plurality of engaging portions are provided on the cover plate 12 , and a second matching portion corresponding to the plurality of engaging portions one by one is provided on the housing 11 , and the engaging portions are engaged with the second matching portions.

[0159] Specifically, the cover plate 12 and the outer shell 11 can be snap-connected, and through the engagement portion on the cover plate 12 and the second mating portion on the outer shell 11, the cover plate 12 and the outer shell 11 can be detachably connected, which is conducive to simplifying the assembly process of the load measuring device 100.

[0160] Optionally, the snap-fitting portion may be a female snap-fit ​​end 121, and the second matching portion may be a male snap-fit ​​end 115. The male snap-fit ​​end 115 may protrude from the outer surface of the outer shell 11, and the female snap-fit ​​end 121 may be matched with the male snap-fit ​​end 115. In other words, the snap connection between the cover 12 and the outer shell 11 adopts an external snap-fit ​​design to facilitate assembly, while also making it convenient to observe the position of the cover 12 and determine whether the cover 12 is installed in place.

[0161] In some optional embodiments of the present application, while the cover plate 12 and the outer shell 11 are clamped together, they can also be connected by one or more processes such as laser welding, ultrasonic welding and glue filling to secondary reinforce the connection between the cover plate 12 and the outer shell 11.

[0162] In some specific embodiments of the present application, the outer contour of the shell 11 is rectangular, and each vertex corner of the shell 11 is provided with a mounting hole 17. The load measuring device 100 also includes a plurality of connecting parts 14, each connecting part 14 is respectively provided in a corresponding mounting hole 17 and connected to the shell 11, and each connecting part 14 is respectively provided with a connecting hole 142 suitable for connecting the connecting part 14 to the outside.

[0163] Specifically, the outer shell 11 with a rectangular outer contour may have four vertex corners. The outer shell 11 may be provided with a plurality of connectors 14, which may be disposed in mounting holes 17 of the outer shell 11. There may be four mounting holes 17, which may be distributed at the four vertex corners of the outer shell 11.

[0164] The housing 11 can be detachably connected to the vehicle frame via a plurality of connecting members 14. Each connecting member 14 can be cylindrical, and the axis of the connecting member 14 can be parallel to the first axis 1.

[0165] In addition, the connecting member 14 may be provided with a connecting hole 142 , which may extend along the axial direction of the connecting member 14 and pass through the connecting member 14 . When the housing 11 and the frame are connected, bolts may be used to pass through the connecting hole 142 .

[0166] The number of the connecting members 14 may be four, and the four connecting members 14 may be distributed at the four corners of the square cover, and the four connecting members 14 may be equivalent to the limbs of a turtle in a bionic design.

[0167] In the embodiment, the housing 11 is connected to the outside via the connector 14 , which can improve the strength and reliability of the connection between the housing 11 and the external structure.

[0168] Optionally, the shell 11 can be of bionic design, and the shape of the shell 11 can be similar to that of a turtle shell 11, that is, the shell 11 can be formed as a square cover, and a plurality of reinforcing ribs 116 can be provided on the shell 11 to increase the strength of the shell 11, and the reinforcing ribs 116 can be roughly equivalent to the skeleton distribution of a turtle. Specifically, the reinforcing ribs 116 on the shell 11 can be arranged in an alternating manner along the transverse and longitudinal directions of the shell 11, and a connecting port 117 can also be provided on the shell 11 so that the load measuring device 100 can be electrically connected to the electrical system of the vehicle, and the connecting port 117 can be equivalent to the head of a turtle.

[0169] According to some optional embodiments of the present application, each connecting member 14 is formed as a columnar metal ring, and the outer wall surface of each connecting member 14 is provided with an annular groove 141 extending along the circumference thereof.

[0170] In addition, an annular groove 141 is further provided on the outer circumferential surface of the connecting member 14, and the annular groove 141 can be arranged around the axial direction of the connecting member 14, that is, the connecting member 14 can be in an I-shape, and a part of the housing 11 can extend into the annular groove 141. Providing the annular groove 141 on the connecting member 14 can improve the strength and reliability of the connection between the connecting member 14 and the housing 11.

[0171] In addition, by configuring the connecting member 14 as a columnar metal ring, the strength of the connecting member 14 itself can be improved, thereby further improving the strength and reliability of the connection between the housing 11 and the external structure.

[0172] For example, the connector 14 can be formed as a copper ring, which can be connected to the housing 11 through a molding process. By providing an annular groove 141, a portion of the housing 11 can be inserted into the annular groove 141 after molding to limit the copper ring and restrict the movement of the copper ring in its own axial direction.

[0173] In some other specific embodiments, the receiving coil can be connected to the control module, and the control module can be set inside the load measuring device 100 or outside the load measuring device 100, which is not limited here. The control chip 53 can receive the output signal generated by the receiving coil, and calculate and obtain the weight information of the part to be measured based on the output signal.

[0174] Specifically, the control module may include a control chip 53 and an electrical control system of the vehicle. The control chip 53 may be connected to the transmitting coil 21 and the two receiving coils respectively, and the control chip 53 may be connected to the electrical system of the vehicle via the pin 15. The control chip 53 may supply power to the transmitting coil 21 so that the transmitting coil 21 generates an alternating excitation magnetic field.

[0175] The circuit board 13 may also be provided with a plurality of pins 15 connected to the control chip 53 , and the pins 15 may face the connection port 117 of the housing 11 to facilitate electrical connection with the electrical system of the vehicle.

[0176] Optionally, the distance between the movable member 30 and the circuit board 13 may be 1.5 mm to 2.5 mm to improve the accuracy and sensitivity of the measurement.

[0177] In some other embodiments of the present application, the second rod 41 and the third rod 42 are respectively flexible rods. Compared with the traditional structure in which the connection is made through connecting members 14 such as bearings, rotating shafts, bolts, nuts, etc., the linkage assembly of this embodiment has a simple structure and a small number of parts, which is conducive to reducing assembly difficulty and production costs and improving assembly efficiency.

[0178] The embodiment of the present application further provides a vehicle, which includes a load measuring device 100, a vehicle frame and a cargo device, wherein the load measuring device is the load measuring device 100 according to any of the above embodiments, the load measuring device 100 is arranged on the vehicle frame, the cargo device is movably arranged on the vehicle, and the cargo device is connected to the connection end of the to-be-measured part of the linkage assembly. The cargo device is formed as the to-be-measured part.

[0179] Since the load measuring device 100 according to the embodiment of the present invention has the above-mentioned technical effects, the vehicle according to the embodiment of the present application also has the corresponding technical effects, that is, the load measurement has higher accuracy and sensitivity, strong anti-interference ability and low cost.

[0180] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A load measuring device, characterized in that: include: case; A transmitting coil, disposed in the housing, for generating an excitation magnetic field; A movable member, at least a portion of which is located in the excitation magnetic field generated by the transmitting coil, and the movable member is rotatable around a first axis to change the excitation magnetic field; at least one receiving coil, disposed in the housing, for detecting a change in the excitation magnetic field to generate an output signal; A linkage component, wherein the linkage component is movably connected to the shell, the linkage component has a connection end for a piece to be measured and a connection end for a movable piece, the connection end for the piece to be measured is connected to the piece to be measured, the connection end for the movable piece extends into the shell and is connected to the movable piece, the piece to be measured is movable relative to the shell and can drive the linkage component to move relative to the shell, and the linkage component can drive the movable piece to rotate around the first axis; the output signal is used to represent the rotation angle information of the movable piece, and the rotation angle information is used to represent the weight information of the piece to be measured.

2. The load measuring device according to claim 1, characterized in that: Also includes: A circuit board is arranged in the shell, the transmitting coil and the receiving coil are respectively arranged on the circuit board, and the movable part is arranged on one side of the circuit board.

3. The load measuring device according to claim 2, characterized in that: The movable part is located opposite to the transmitting coil and the receiving coil.

4. The load measuring device according to claim 2, characterized in that: The number of the at least one receiving coil is two, each of the receiving coils is formed as a coil surrounded by a sine wave, the two receiving coils are coaxially arranged, and the sine waves of the two receiving coils are offset by a preset angle.

5. The load measuring device according to claim 2, characterized in that: The transmitting coil is formed as a toroidal coil coaxial with the receiving coil, and the transmitting coil is wound around the outer circumference of the receiving coil.

6. The load measuring device according to claim 5, characterized in that: The first axis coincides with an axis of the transmitting coil.

7. The load measuring device according to claim 5, characterized in that: The transmitting coil includes two layers of excitation coils, and the two layers of excitation coils have the same number of turns.

8. The load measuring device according to claim 2, characterized in that: The transmitting coil is arranged on the first side of the circuit board, the receiving coil is arranged on the second side of the circuit board, and a part of the receiving coil passes through the circuit board and is located on the first side of the circuit board.

9. The load measuring device according to claim 2, characterized in that: A positioning portion is provided on one of the housing and the circuit board, and a first matching portion is provided on the other. The positioning portion matches with the first matching portion to position the circuit board, and the positioning portion or the first matching portion is eccentrically arranged on the circuit board.

10. The load measuring device according to claim 1, characterized in that: The movable parts include: An annular sheet body, the annular sheet body is connected to the connecting end of the movable member, and the annular sheet body is rotatable around the first axis; A plurality of blades are provided on the outer peripheral surface of the annular sheet body 31 at intervals along the circumferential direction of the annular sheet body, and the blades are rotatable around the first axis to cut the magnetic flux lines between the transmitting coil and the receiving coil.

11. The load measuring device according to claim 10, characterized in that: A convex portion convex toward one side along the thickness direction of the annular sheet body is provided in the middle part of the annular sheet body, and the convex portion is connected to the connecting end of the movable part.

12. The load measuring device according to claim 11, characterized in that: The first end of the protrusion is connected to the annular sheet body, the second end of the protrusion is away from the annular sheet body, and the radial dimension of the protrusion gradually decreases from the first end to the second end.

13. The load measuring device according to claim 11, characterized in that: The protrusion is connected to the connecting end of the movable part by injection molding.

14. The load measuring device according to claim 10, characterized in that: The movable part is an integrally formed metal sheet.

15. The load measuring device according to claim 2, characterized in that: The shell defines a receiving cavity, and the shell has a mounting channel communicated with the receiving cavity, the circuit board and the movable part are respectively arranged in the receiving cavity, and the connecting end of the movable part passes through the mounting channel and is connected to the movable part.

16. The load measuring device according to claim 15, characterized in that: The housing is provided with a mounting column extending along the first axis, and the mounting channel is provided in the mounting column.

17. The load measuring device according to claim 16, characterized in that: The first end of the mounting post extends into the accommodating cavity and abuts against the circuit board, and the second end of the mounting post extends out of the housing.

18. The load measuring device according to claim 16, characterized in that: The linkage components include: A first rod, the first rod is arranged in the installation channel, the first rod extends along the axial direction of the first axis through the installation channel and deep into the accommodating cavity, the first rod is rotatable around the first axis, and the first end of the first rod constitutes a movable member connecting end connected to the movable member; A second rod, wherein the first end of the second rod is connected to the second end of the first rod, the second end of the second rod constitutes a connecting end of the object to be measured connected to the object to be measured, and is driven by the object to be measured to rotate around the first axis.

19. The load measuring device according to claim 18, characterized in that: The outer wall surface of the first rod is provided with a mounting groove, and the load measuring device further comprises: A sealing ring is arranged in the installation groove to seal the gap between the first rod and the installation column.

20. The load measuring device according to claim 18, characterized in that: The first end of the first rod is provided with a limiting portion, the housing is provided with a limiting hole, and the load measuring device further comprises: At least one limiting member passes through the limiting hole and cooperates with the limiting portion to limit the position of the first rod on the first axis.

21. The load measuring device according to claim 20, characterized in that: The limiting portion is arranged on the outer circumferential surface of the first rod, the limiting portion is formed as an annular groove extending along the circumferential direction of the first rod, the limiting member is formed as a limiting rod, and the limiting rod passes through the limiting hole and is inserted into the annular groove.

22. The load measuring device according to claim 21, characterized in that: There are two limiting members, and the two limiting members are arranged in parallel on opposite sides of the first rod.

23. The load measuring device according to claim 19, characterized in that: The first rod comprises: a first rod segment, the first rod segment is arranged in the installation channel, the outer wall surface of the first rod segment is provided with the installation groove, the first end of the first rod segment faces the circuit board, and the second end of the first rod segment is connected to the second rod member; The second rod segment is arranged at the second end of the first rod segment, the second rod segment is coaxially arranged with the first rod segment, and the outer diameter of the second rod segment is smaller than the outer diameter of the first rod segment, and the second rod segment is constructed to be suitable for connection with the movable part.

24. The load measuring device according to claim 23, characterized in that: The first rod also includes: The third rod segment is arranged between the second rod segment and the movable member, the first end of the third rod segment is connected to the second rod segment, and the second end of the third rod segment is connected to the movable member.

25. The load measuring device according to claim 24, characterized in that: The first rod segment and the second rod segment are respectively formed into hollow columnar structures, and a first end of the third rod segment is provided with a hollow portion.

26. The load measuring device according to claim 18, characterized in that: The linkage component also includes: A swing arm ball head, the swing arm ball head being arranged at the second end of the second rod; A third rod, a first end of the third rod 42 is movably connected to the swing arm ball head, and a second end of the third rod is connected to the object to be measured.

27. The load measuring device according to claim 15, characterized in that: The housing comprises: A shell, wherein the accommodating cavity is defined in the shell, and the mounting channel is arranged in the shell; A cover plate is connected to the shell to close the accommodating cavity.

28. The load measuring device according to claim 27, characterized in that: The cover plate is provided with a plurality of engaging parts, the housing is provided with a second matching part corresponding to the plurality of engaging parts one by one, and the engaging part is engaged with the second matching part.

29. The load measuring device according to claim 27, characterized in that: The outer contour of the housing is a rectangle, and each vertex of the housing is provided with a mounting hole. The load measuring device further comprises: A plurality of connecting members, each of which is respectively arranged at the corresponding mounting hole and connected to the housing, and each of which is respectively provided with a connecting hole suitable for connecting the connecting member to the outside.

30. The load measuring device according to claim 29, characterized in that: Each of the connecting pieces is formed as a columnar metal ring, and the outer wall surface of each of the connecting pieces is provided with an annular groove extending along the circumference thereof.

31. A vehicle, characterized in that: include: Frame; A load measuring device, wherein the load measuring device is the load measuring device according to any one of claims 1 to 30, and the load measuring device is arranged on the frame; A cargo carrying device, the cargo carrying device can be movably arranged on the frame, and the cargo carrying device is connected to the connecting end of the piece to be measured of the linkage assembly.

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