Safety belt tension sensor

Abstract

The utility model discloses a safety belt tension sensor which comprises a stress part and stress columns located on the two sides of the front portion of the stress part, a safety belt through opening for a safety belt to penetrate through is formed between the stress columns on the two sides and the stress part respectively, and a stress face is arranged in the middle of the front side face, facing the stress columns, of the stress part in the longitudinal direction. And the stress surface is a convex arc surface. Compared with a plane form in the prior art, the safety belt is in point contact with the stress surface in a cross section, the contact area is smaller, and when the safety belt is stretched due to stress, due to the fact that the contact area of the safety belt and the stress surface is small, mutual displacement basically does not occur at the contact position, and friction is not generated. Therefore, the friction force generated by the stretching of the safety belt and the mutual movement of the stress surface can be correspondingly reduced, the hysteresis of the sensor is reduced, the stability and response speed of the sensor are ensured, the error between an output value and an actual value is avoided, and the measurement precision is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, in particular to a safety belt tension sensor. Background Art

[0002] The stretching of seat belts is generally measured by seat belt tension sensors, which is crucial in vehicle collision tests and is an important item for testing seat belt performance and vehicle safety performance.

[0003] The existing seat belt tension sensor includes a force-bearing part and force-bearing columns located on both sides in front of the force-bearing part, a seat belt passage for allowing the seat belt to pass through is formed between the force-bearing column and the force-bearing part, and a force-bearing surface is provided in the middle part of the front side surface of the force-bearing part facing the force-bearing column along the longitudinal direction, and the force-bearing surface is a plane, so that when the seat belt and the force-bearing surface are in contact, when both ends of the seat belt are subjected to tension, the seat belt is stretched to both sides with the force-bearing surface as the midpoint, and there will be friction when the seat belt and the force-bearing surface move against each other. Since the force-bearing surface is a plane, the seat belt and the force-bearing surface are in surface contact, and the stretching of the seat belt will generate friction with the plane, and there is an interaction between the seat belt and the angle transition on both sides of the force-bearing surface, which generates corresponding friction. The greater the friction, the greater the hysteresis of the sensor, and the stability and response speed are affected, resulting in an error between the output value and the actual value, thereby affecting the measurement accuracy. Utility Model Content

[0004] In view of the above shortcomings, the utility model provides a seat belt tension sensor, which can solve the problem of large hysteresis of the existing seat belt tension sensor.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A seat belt tension sensor comprises a force-bearing part and force-bearing columns located on both sides in front of the force-bearing part, a seat belt passage for allowing the seat belt to pass through is formed between the force-bearing columns and the force-bearing part on both sides, and the force-bearing part is provided with a force-bearing surface along the longitudinal direction in the middle part of the front side surface facing the force-bearing column, and the force-bearing surface is an outwardly convex arc surface.

[0007] Furthermore, the force-bearing portion is further provided with transition surfaces located on both sides of the force-bearing surface on the front side surface facing the force-bearing column, and the transition surfaces are inclined surfaces inclined in a direction away from the force-bearing surface.

[0008] Furthermore, a first limiting portion is provided at one end of the force-bearing portion, and a second limiting portion is provided at the other end, the first limiting portion is provided with two through holes for the force-bearing column to pass through, the second limiting portion is provided with two insertion slots for inserting the force-bearing column, the second limiting portion is provided with a pin hole that penetrates through the insertion slot, and a limiting pin is arranged in the pin hole; the force-bearing column includes a first end portion and a second end portion respectively located at both ends, and the second end portion is provided with a limiting slot, so that when the force-bearing columns located on both sides respectively pass through the through holes of the first limiting portion and are inserted into the insertion slots of the second limiting portion, the limiting slots are located in the insertion slots and can allow the limiting pins to be inserted into the limiting slots to limit the force-bearing column from axial movement.

[0009] Furthermore, the first end portion is provided with a force-bearing column boss whose size is larger than the through hole.

[0010] Furthermore, the limiting groove is an annular groove arranged circumferentially around the load-bearing column.

[0011] Furthermore, the pin hole includes a accommodating cavity and an extending cavity, the limiting pin includes a accommodating section and an extending section, the accommodating cavity is connected to the insertion groove, and the size of the accommodating section is larger than the size of the extending cavity; an elastic member is arranged in the accommodating cavity, the accommodating section is located in the accommodating cavity and abuts against the elastic member so that under the action of the elastic member, it has a tendency to move toward the extending cavity and is partially located in the limiting groove, the extending section partially extends out of the pin hole through the extending cavity, and when the extending section is pressed inward, the accommodating section moves away from the extending cavity and leaves the limiting groove.

[0012] Furthermore, the accommodating cavity penetrates the second limiting portion at one end away from the extending cavity, and the accommodating cavity is detachably provided with a blocking portion at the end portion penetrating the second limiting portion, and both ends of the elastic member are respectively abutted against the blocking portion and the accommodating section.

[0013] Furthermore, a groove is provided on a side surface of the second limiting portion, and a portion of the extending section extending out of the second limiting portion is located in the groove.

[0014] Furthermore, the force-bearing part is provided with a placement cavity on the rear side facing away from the force-bearing column, the opening of the placement cavity is covered with a top cover, the force-bearing column is provided with a screw hole on the inner wall corresponding to the placement cavity that does not penetrate to the front side, and the top cover is connected to the screw hole by bolts.

[0015] Furthermore, a strain gauge is installed in the placement cavity.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The seat belt tension sensor of the utility model, by setting the force surface of the force-bearing part as an outwardly convex arc surface, can be regarded as point contact between the seat belt and the force-bearing surface in a cross section, and the contact area is smaller than the plane form of the prior art. Therefore, when the seat belt is stretched by force, since the contact area between the seat belt and the force-bearing surface is small and there is basically no mutual displacement at the contact position and no friction is generated, the friction force generated by the stretching of the seat belt and the mutual movement of the force-bearing surface can be reduced accordingly, so as to reduce the hysteresis of the sensor. The smaller the hysteresis, the higher the stability of the sensor and the faster the response speed, thereby avoiding errors between the output value and the actual value and ensuring the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0019] Figure 1 It is a structural schematic diagram of the seat belt tension sensor of the utility model from one viewing angle;

[0020] Figure 2 This is a schematic diagram of the structure of the seat belt tension sensor of the utility model from another perspective;

[0021] Figure 3 This is a structural schematic diagram of the seat belt tension sensor of the utility model from another perspective;

[0022] Figure 4 It is a schematic diagram of the function between the safety belt tension sensor of the utility model and the safety belt during implementation;

[0023] Figure 5 A schematic diagram of the interaction between a seat belt tension sensor of the prior art and a seat belt during implementation;

[0024] Figure 6 A cross-sectional schematic diagram of the seat belt tension sensor of the utility model;

[0025] Figure 7 Another cross-sectional schematic diagram of the seat belt tension sensor of the utility model;

[0026] Figure 8 It is a cross-sectional schematic diagram of the seat belt tension sensor of the utility model;

[0027] Fig. 9 It is a schematic diagram of the implementation of the seat belt tension sensor of the utility model when placing the seat belt;

[0028] Fig.10 This is a schematic diagram of the implementation of the seat belt tension sensor of the utility model after the seat belt is placed.

[0029] Among them, the markings shown in the figure are: 10-force-bearing part; 11-force-bearing surface; 12-transition surface; 13-mounting cavity; 14-strain gauge; 15-top cover; 20-force-bearing column; 21-first end; 22-second end; 23-limiting groove; 24-force-bearing column boss; 30-safety belt passage; 41-first limiting part; 42-second limiting part; 43-through hole; 44-insertion groove; 45-pin hole; 451-accommodating cavity; 452-extending cavity; 46-limiting pin; 461-accommodating section; 462-extending section; 47-elastic member; 48-sealing part; 49-groove; 50-safety belt. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] Please refer to Figures 1 to 4 , Figures 6 to 10The preferred embodiment of the utility model provides a seat belt tension sensor, the main structure of which includes a force-bearing part 10 and force-bearing columns 20 located on both sides in front of the force-bearing part 10. The main body of the force-bearing part 10 is a rod-shaped structure extending longitudinally, and the force-bearing columns 20 on both sides are parallel to the force-bearing part 10, and the force-bearing columns 20 on both sides are symmetrically located on both sides of the force-bearing part 10. A seat belt opening 30 for allowing the seat belt to pass through is formed between the force-bearing columns 20 on both sides and the force-bearing part 10, respectively. The two seat belt openings 30 allow the seat belt to pass through or accommodate the seat belt during implementation. At this time, during implementation, the force-bearing part 10 will contact the seat belt on the front side facing the force-bearing columns 20, and at the same time, the force-bearing columns 20 on both sides will also contact the seat belt.

[0034] The force-bearing part 10 is provided with a receiving cavity 13 at the rear side away from the force-bearing column 20, and the open part of the receiving cavity 13 is covered with a top cover 15. The force-bearing column 20 is provided with a screw hole that does not penetrate to the front side at the inner wall corresponding to the receiving cavity 13. The top cover 15 is connected to the screw hole by a bolt, and at this time the screw hole does not penetrate the front side, so that there will be no screw hole opening on the front side, so that when the safety belt is released from the front side and shifted to each other in time, there will be no situation where the safety belt is lost due to friction between the screw hole opening and the safety belt.

[0035] A strain gauge 14 is installed in the placement cavity 13, so that when the seat belt is tensioned and a tensile force is applied to the force-bearing part 10 during testing, the force-bearing part 10 is deformed, and detection is performed through the strain gauge 14, thereby realizing a seat belt tension sensor.

[0036] Please refer to Figure 5 , which is an existing conventional seat belt tension sensor. The existing seat belt tension sensor has a force-bearing surface arranged in the middle of the front side of the force-bearing column 20 along the longitudinal direction. The force-bearing surface is a plane, and there is an obvious angle transition at the transition between the two sides of the force-bearing surface and the two sides. Figure 5 In the figure, A is a schematic diagram of the contact between the seat belt 50 and the force-bearing surface, and B and C are schematic diagrams of the contact with the two force-bearing columns. The plane force-bearing surface makes the surface contact with the force-bearing surface produce a larger friction force due to the larger contact area when the seat belt is stretched by force, and there is an interaction between the seat belt and the angle transition on both sides of the force-bearing surface. This interaction produces a corresponding friction force. The greater the friction force, the greater the hysteresis of the sensor. The seat belt tension sensor of the utility model can refer to Figure 4In the figure, A is a schematic diagram of the contact between the safety belt 50 and the force-bearing surface, and B and C are schematic diagrams of the contact with the two force-bearing columns respectively. The force-bearing part 10 is provided with a force-bearing surface 11 along the longitudinal direction in the middle part of the front side surface facing the force-bearing column 20, and the force-bearing surface 11 is a convex arc surface. By setting the force-bearing surface 11 as a convex arc surface, compared with the plane form of the prior art, it can be regarded as that the safety belt and the force-bearing surface 11 are in point contact in a cross section, and the contact area is smaller. When the safety belt is stressed and stretched, since the contact area between the safety belt and the force-bearing surface 11 is small and there is basically no mutual displacement at the contact position, no friction is generated. The friction generated by the elongation of the safety belt and the mutual movement of the force-bearing surface can be reduced accordingly, so as to reduce the hysteresis of the sensor, ensure the stability and response speed of the sensor, avoid the error between the output value and the actual value, and ensure the measurement accuracy. At the same time, due to the arc form, the force-bearing surface 11 is not easy to damage the safety belt when it acts. That is, while ensuring that the safety belt 50 and the force-bearing surface 11 are in point contact (the entire longitudinal direction is in line contact) to reduce friction, the force-bearing surface 11 should not be too sharp to damage the safety belt.

[0037] Preferably, Figure 6 As shown, the force-bearing part 10 is further provided with transition surfaces 12 located on both sides of the force-bearing surface 11 on the front side facing the force-bearing column 20, and the transition surfaces 12 are inclined surfaces inclined away from the force-bearing surface 11. The provision of the transition surfaces 12 can reduce the volume and weight, facilitate the elastic deformation of the force-bearing part 10, and avoid the position corresponding to the transition surfaces 12 from contacting with the safety belt to generate friction.

[0038] In a preferred embodiment, a first limiting portion 41 is provided at one end of the force-bearing portion 10, and a second limiting portion 42 is provided at the other end. The first limiting portion 41 is provided with two through holes 43 for the force-bearing column 20 to pass through. In this preferred embodiment, the force-bearing column 20 is a cylindrical structure as a whole, so the through hole 43 is a circular hole and matches the force-bearing column 20 to prevent the force-bearing column 20 from shaking after passing through the through hole 43. The second limiting portion 42 is provided with two insertion grooves 44 for inserting the force-bearing column 20. After the force-bearing column 20 passes through the through hole 43, one end is inserted into the insertion groove 44. The two insertion grooves 44 are opposite to the two through holes 43 one by one. The insertion groove 44 can be open to one side of the through hole 43, or it can be a through groove that passes through the second limiting portion 42. In this exemplary embodiment, the insertion groove 44 is a through groove that passes through the entire second limiting portion 42, and the insertion groove 44 is a circular groove to match the end of the force-bearing column 20 to prevent the force-bearing column 20 from shaking.

[0039] The second limiting portion 42 is provided with a pin hole 45 penetrating to the insertion slot 44. In this exemplary embodiment, the pin hole 45 and the insertion slot 44 are perpendicular to each other. A limiting pin 46 is disposed in the pin hole 45, that is, a limiting pin 46 is inserted into the pin hole 45, and the limiting pin 46 can be partially located in the insertion slot 44. The force-bearing column 20 includes a first end portion 21 and a second end portion 22 respectively located at both ends. The second end portion 22 is provided with a limiting slot 23, so that when the force-bearing columns 20 located at both sides respectively pass through the through hole 43 of the first limiting portion 41 and are inserted into the insertion slot 44 of the second limiting portion 42, the limiting slot 23 is located in the insertion slot 44 and the limiting pin 46 can be inserted into the limiting slot 23 to limit the force-bearing column 20 from axial movement. That is, when the second end portion 22 is inserted into the insertion slot 44, the limiting slot 23 is opposite to the pin hole 45, and the limiting pin 46 can be inserted into the limiting slot 23, thereby limiting the force-bearing column 20 from axial movement. Through the above method, the force-bearing column 20 can be installed and fixed to the force-bearing part 10. Compared with the traditional threaded nut matching method, this installation method has higher and simpler disassembly and assembly efficiency and no risk of the force-bearing column 20 being separated from the force-bearing part 10 due to the loosening of the nut. During implementation, due to the characteristics of the seat belt mechanism, the force-bearing column 20 needs to be removed before the seat belt can be installed into the seat belt tension sensor. At this time, the force-bearing column 20 is pulled out, and then the seat belt is placed in the position corresponding to the seat belt opening 30 (such as Fig. 9 As shown), the two force-bearing columns 20 are respectively inserted into the two through holes 43. After the two force-bearing columns 20 pass through the through holes 43 (not completely, the first end 21 does not pass through), the second end 22 with the limiting groove 23 is inserted into the insertion groove 44, and the limiting groove 23 is directly opposite to the pin hole 45 (at this time, the limiting pin 46 is not located in the insertion groove 44 and does not affect the insertion of the second end 22). By partially inserting the limiting pin 46 into the limiting groove 23, the limiting pin 46 can interact with the limiting groove 23 to limit the axial movement of the second end 22, so that the force-bearing column 20 is installed and fixed on the force-bearing part 10 (as shown in FIG. Fig.10 As shown in FIG. 4 ), the seat belt 50 passes through the two seat belt openings 30 and cannot be separated from the seat belt tension sensor. When the seat belt tension sensor needs to be separated from the seat belt, the limit pin 46 is moved to separate it from the insertion slot 44. At this time, the limit pin 46 releases the limiting effect on the force bearing column 20, and the force bearing column 20 is pulled out to a certain position, so that the seat belt can leave the seat belt opening 30 again.

[0040] In a preferred embodiment, the first end portion 21 is provided with a force column boss 24 having a size larger than the through hole 43, and the force column boss 24 is a circular boss structure, coaxial with the force column 20, and the force column boss 24 is provided so that the first end portion 21 cannot completely pass through the through hole 43 under the action of the force column boss 24, so as to form an axial limit. Furthermore, when the second end portion 22 is inserted into the insertion groove 44 and the limit pin 46 is partially inserted into the limit groove 23, the side of the force column boss 24 abuts against the side of the first limit portion 41.

[0041] In a preferred embodiment, the limit groove 23 is an annular groove arranged circumferentially around the load-bearing column 20, so that when the limit pin 46 is partially inserted into the limit groove 23, the load-bearing column 20 can be limited axially, but there is no circumferential limitation. At this time, when the seat belt is tested, the seat belt is subjected to tension and acts on the force surface 11 of the force-bearing part 10 and the load-bearing column 20. By setting a circumferentially unrestricted load column 20, the load-bearing column 20 can passively rotate with the tension of the seat belt. By converting the sliding friction between the seat belt and the load-bearing column 20 into mainly rolling friction to reduce the friction between the two, on the one hand, the wear of the seat belt can be avoided, and on the other hand, the measurement accuracy can be improved.

[0042] In this preferred embodiment, please refer to Figure 7 and Figure 8The pin hole 45 includes a receiving chamber 451 and a protruding chamber 452. Both the receiving chamber 451 and the protruding chamber 452 are cylindrical chamber structures and are coaxially arranged. The receiving chamber 451 is connected to the insertion groove 44, and the connection point is mainly located at one side of the receiving chamber 451 close to the protruding chamber 452. The limiting pin 46 includes a receiving section 461 and a protruding section 462. Both the receiving section 461 and the protruding section 462 are cylindrical structures and are coaxially arranged. The size of the receiving section 461 is larger than the size of the protruding chamber 452. The receiving section 461 is matched and located in the receiving chamber 451 and can move axially along the receiving chamber 451. The protruding section 462 is matched and located in the protruding chamber 452 and can move axially along the protruding chamber 452. An elastic member 47 is provided in the accommodating cavity 451, and the elastic member 47 is preferably a compression spring, which has the functions of deformation and reset. The accommodating section 461 is located in the accommodating cavity 451 and abuts against the elastic member 47 so that under the action of the elastic member 47, it has a tendency to move toward the extension cavity 452, and the part connected with the insertion groove 44 through the accommodating cavity 451 is partially located in the limiting groove 23. The local part of the accommodating section 461 is the part of the step close to the extension section 462. At this time, the accommodating section 461 and the limiting groove 23 are limited. The load-bearing column 20 moves axially, and when the limiting groove 23 is an annular groove circumferentially arranged around the load-bearing column 20, the load-bearing column 20 can also rotate; when the accommodating section 461 enters the insertion groove 44 and interacts with the limiting groove 23, the extending section 462 partially extends out of the pin hole 45 through the extending cavity 452, and when the extending section 462 is pressed inward, the accommodating section 461 moves away from the extending cavity 452 and leaves the limiting groove 23. At this time, the accommodating section 461 releases the axial limitation on the load-bearing column 20, and the load-bearing column 20 can be pulled axially out of the insertion groove 44. It is understandable that when the second end 22 of the force-bearing column 20 is not located in the insertion groove 44, the accommodation section 461 will enter the insertion groove 44 under the action of the elastic member 47, press the outer end of the extension section 462, and then the elastic member 47 is compressed, and the accommodation section 461 moves away from the extension cavity 452 and leaves the insertion groove 44. At this time, the force-bearing column 20 can move toward the insertion groove 44 and allow the second end 22 to enter the insertion groove 44. At this time, the extension section 462 is released, and the accommodation section 461 will enter the insertion groove 44 and be located in the limiting groove 23 of the second end 22 under the action of the elastic member 47, so as to achieve axial limiting of the force-bearing column 20. The limiting and release method of this preferred embodiment, through the form of the elastic member driving the latch, the limiting is simple, efficient, convenient and reliable, without the cumbersome operation of tightening or loosening in the nut limiting method, and there is no hidden danger caused by the loosening of the nut, and the rotation of the force-bearing column 20 can be achieved to avoid the wear of the safety belt and improve the accuracy of the test.

[0043] Preferably, the accommodating cavity 451 penetrates the second limiting portion 42 at one end away from the extending cavity 452, and the accommodating cavity 451 is detachably provided with a blocking portion 48 at the end portion penetrating the second limiting portion 42, and the two ends of the elastic member 47 are respectively in contact with the blocking portion 48 and the accommodating section 461. By setting the structure that the accommodating cavity 451 penetrates the second limiting portion 42, it is convenient to open the accommodating cavity 451 and put the limiting pin 46, the elastic member 47, etc. into the accommodating cavity 451. When the limiting pin 46, the elastic member 47, etc. are sequentially put into the accommodating cavity 451, the open portion of the accommodating cavity 451 is blocked by the blocking portion 48, and at this time, the elastic member 47 is in contact with the blocking portion 48. The inner edge of the open opening of the accommodating cavity 451 is provided with an internal thread, and the blocking portion 48 is provided with a matching external thread, and the blocking portion 48 is detachably installed at the open portion of the accommodating cavity 451 through a threaded connection.

[0044] A groove 49 is provided on the side surface of the second limiting portion 42, and the portion of the extending section 462 extending out of the second limiting portion 42 is located in the groove 49. By digging the groove 49 and allowing the portion of the extending section 462 extending out of the second limiting portion 42 to be located in the groove 49, it is possible to prevent the portion of the extending section 462 extending out of the second limiting portion 42 from extending too far out of the outer side surface of the second limiting portion 42, thereby preventing the portion of the extending section 462 extending out of the second limiting portion 42 from being accidentally touched and pressed during testing, etc., causing the limiting pin 46 to be accidentally shifted and the limiting of the load-bearing column 20 to be released.

[0045] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A seat belt tension sensor, comprising a force-bearing portion (10) and force-bearing columns (20) located on both sides in front of the force-bearing portion (10), wherein a seat belt passage (30) for allowing a seat belt to pass through is formed between the force-bearing columns (20) on both sides and the force-bearing portion (10), Features: The force-bearing portion (10) is provided with a force-bearing surface (11) along the longitudinal direction in the middle of the front side surface facing the force-bearing column (20), and the force-bearing surface (11) is an outwardly convex arc surface.

2. The seat belt tension sensor according to claim 1, Features: The force-bearing portion (10) is further provided with transition surfaces (12) located on both sides of the force-bearing surface (11) on the front side surface facing the force-bearing column (20), and the transition surfaces (12) are inclined surfaces inclined in a direction away from the force-bearing surface (11).

3. The seat belt tension sensor according to claim 1, Features: The force-bearing portion (10) is provided with a first limiting portion (41) at one end and a second limiting portion (42) at the other end; the first limiting portion (41) is provided with two through holes (43) for the force-bearing column (20) to pass through; the second limiting portion (42) is provided with two insertion slots (44) for the force-bearing column (20) to be inserted; the second limiting portion (42) is provided with a pin hole (45) extending through the insertion slot (44); a limiting pin (46) is disposed in the pin hole (45); the force-bearing column (20) is provided with a first limiting portion (41) and a second limiting portion (42) is provided with a second limiting portion (45) and a second limiting portion (46) is disposed in the second limiting portion (45); ) comprises a first end portion (21) and a second end portion (22) respectively located at both ends, and the second end portion (22) is provided with a limiting groove (23) so that when the load-bearing columns (20) located on both sides respectively pass through the through holes (43) of the first limiting portion (41) and are inserted into the insertion groove (44) of the second limiting portion (42), the limiting groove (23) is located in the insertion groove (44) and enables the limiting pin (46) to be inserted into the limiting groove (23) to limit the load-bearing column (20) from axial movement.

4. The seat belt tension sensor according to claim 3, Features: The first end portion (21) is provided with a force-bearing column boss (24) having a size larger than the through hole (43).

5. The seat belt tension sensor according to claim 3, Features: The limiting groove (23) is an annular groove arranged circumferentially around the force-bearing column (20).

6. The seat belt tension sensor according to any one of claims 3 to 5, Features: The pin hole (45) comprises a receiving cavity (451) and a protruding cavity (452); the limiting pin (46) comprises a receiving section (461) and a protruding section (462); the receiving cavity (451) is communicated with the insertion groove (44); the size of the receiving section (461) is larger than the size of the protruding cavity (452); an elastic member (47) is arranged in the receiving cavity (451); the receiving section (461) is located in the receiving cavity (451) and is in contact with the receiving cavity (451). The elastic members (47) are in contact with each other so that, under the action of the elastic members (47), they have a tendency to move toward the extension cavity (452) and are partially located in the limiting groove (23); the extension section (462) partially extends out of the pin hole (45) through the extension cavity (452); and when the extension section (462) is pressed inward, the accommodation section (461) moves in a direction away from the extension cavity (452) and leaves the limiting groove (23).

7. The seat belt tension sensor according to claim 6, Features: The accommodating cavity (451) penetrates the second limiting portion (42) at one end away from the extending cavity (452); the accommodating cavity (451) is detachably provided with a blocking portion (48) at the end portion that penetrates the second limiting portion (42); and the two ends of the elastic member (47) are respectively in contact with the blocking portion (48) and the accommodating section (461).

8. The seat belt tension sensor according to claim 6, Features: A groove (49) is provided on the side surface of the second limiting portion (42), and the portion of the extending section (462) extending out of the second limiting portion (42) is located in the groove (49).

9. The seat belt tension sensor according to claim 1, Features: The force-bearing part (10) is provided with a placement cavity (13) on the rear side away from the force-bearing column (20); the opening of the placement cavity (13) is covered with a top cover (15); the force-bearing column (20) is provided with a screw hole on the inner wall corresponding to the placement cavity (13) that does not penetrate to the front side; the top cover (15) is connected to the screw hole by a bolt.

10. The seat belt tension sensor according to claim 9, Features: A strain gauge (14) is installed in the placement cavity (13).

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