CN219511668U - Weighing sensor with anti-transportation fall mechanism and electronic balance thereof - Google Patents

Abstract

The utility model provides a weighing sensor with an anti-transportation fall mechanism and an electronic balance thereof, wherein the weighing sensor comprises a base, a mandrel, an elastomer, a sleeve, a limiting pin, a scale bracket and a scale joint, wherein the base is provided with a mounting groove, the scale bracket is provided with a through hole, and the sleeve penetrates through the through hole and extends into the mounting groove; the dabber wears to establish in the sleeve, and the elastomer is installed between dabber and sleeve, and the tip at the dabber is installed to the pan of steelyard joint, and the spacer pin is installed at the end of dabber, is located telescopic outside, and telescopic end is provided with a plurality of spacing grooves, is provided with limit baffle on the internal face of mounting groove. The utility model can realize the switching of the weighing sensor between a non-transportation state protection state, an overload protection state and a transportation protection state, can improve the anti-falling impact capability in the transportation process, and the force applied to the strength weak piece is controlled by the compression amount of the elastic body and does not exceed the yield strength of the elastic body.

Description

Weighing sensor with anti-transportation fall mechanism and electronic balance thereof

Technical Field

The utility model relates to the field of weighing sensors, in particular to a weighing sensor with an anti-transportation fall-off mechanism and an electronic balance thereof.

Background

The existing electronic balance is damaged due to falling impact in the transportation process, and particularly the high-precision electronic balance adopting the electromagnetic force balance type weighing sensor is easy to damage after falling impact.

In patent document CN202123259807U, an electronic balance can be adsorbed on a platform by providing an adsorption assembly, thereby avoiding collision or drop, but cannot function during transportation.

In patent document CN200720071516U, a "Z" shaped plate is held against with a screw to prevent the weight sensor from being damaged during transportation. The load cell of this patent is of the strain gauge type. Because of the different structure and working principle of the electromagnetic force balance type weighing sensor, the weak sensitive parts (spring sheets) in the sensor are damaged by the mode of pushing the Z-shaped plate by the screws. Thus, this approach is not suitable for use with electromagnetic balance weighing cells, and requires additional fasteners and "Z" plates.

In CN207798246U, a floating overload protection structure is provided on the weighing sensor assembly, and the weighing sensor assembly can be separated from the weighing sensor assembly when being placed upside down, so as to reduce the impact on the weighing sensor assembly, but the impact on the weighing sensor assembly when being placed in the forward direction cannot be reduced.

Therefore, a high-precision electronic balance using an electromagnetic force balance type weighing sensor needs to be improved in impact resistance, and is not damaged when the electronic balance falls down in transportation.

In view of the above, the present inventors devised a load cell with a transportation fall-resistant mechanism and an electronic balance thereof, so as to overcome the above-mentioned problems.

Disclosure of Invention

The utility model aims to overcome the defects that a weighing sensor is easy to be impacted, damaged and the like in the prior art, and provides the weighing sensor with the transportation drop-resistant mechanism and an electronic balance thereof.

The utility model solves the technical problems by the following technical proposal:

the weighing sensor with the transportation drop-resistant mechanism is characterized by comprising a base, a mandrel, an elastic body, a sleeve, a limiting pin, a scale support and a scale joint, wherein a mounting groove is formed in the base, a through hole is formed in the scale support, and the sleeve penetrates through the through hole and extends into the mounting groove;

the elastic body is arranged between the mandrel and the sleeve in a penetrating mode, the scale pan joint is arranged at the end part of the mandrel, the limiting pin is arranged at the tail end of the mandrel and located outside the sleeve, a plurality of limiting grooves are formed in the tail end of the sleeve, and a limiting baffle is arranged on the inner wall surface of the mounting groove and used for limiting the upward moving position of the limiting pin;

when the scale pan connector bears downward force and exceeds the pre-compression force of the elastic body, the weighing sensor enters an overload protection state, the limiting pin moves downwards and is separated from the corresponding limiting groove to be in contact with the base, and the base bears load exceeding the compression force of the elastic body, so that the movable part of the weighing sensor is fixed in position;

when the weighing sensor is in a transportation protection state, the limiting pin is in contact with the limiting baffle plate to limit the position of the limiting pin, so that the limiting pin enters the corresponding limiting groove, and the elastic body applies a fixed load to the movable part of the weighing sensor to fix the position of the movable part.

According to one embodiment of the utility model, the limit stop plate extends horizontally outwards along the inner wall surface and is located above the limit pin.

According to one embodiment of the utility model, the limiting groove is a U-shaped groove.

According to one embodiment of the utility model, the end of the sleeve is provided with four symmetrically distributed U-shaped grooves.

According to one embodiment of the utility model, the U-shaped groove comprises at least one pair of first U-shaped grooves and at least one pair of second U-shaped grooves which are oppositely arranged;

when the position of the movable part of the weighing sensor can move, the limiting pin is positioned in the first U-shaped groove and is spaced from the base; when the weighing sensor is in a transportation protection state, the limiting pin is positioned in the second U-shaped groove, and an interval is reserved between the limiting pin and the bottom of the second U-shaped groove.

According to one embodiment of the utility model, a first rotating baffle is further arranged on the inner wall surface of the mounting groove and is used for limiting the rotating angle of the mandrel when the weighing sensor is switched from the overload protection state to the transportation protection state.

According to one embodiment of the utility model, a second rotating baffle plate is further arranged on the inner wall surface of the mounting groove and is used for limiting the rotating angle of the mandrel when the weighing sensor is switched from the transportation protection state to the non-transportation protection state.

According to one embodiment of the utility model, the first rotating barrier and the second rotating barrier are connected vertically below the limit barrier.

The utility model also provides a weighing sensor with the transportation drop-resistant mechanism, which is characterized by comprising a base, a mandrel, an elastomer, a sleeve and a scale bracket, wherein the base is provided with a mounting groove, the scale bracket is provided with a through hole, and the sleeve penetrates through the through hole and extends into the mounting groove;

the mandrel is arranged in the sleeve in a penetrating way, the elastomer is arranged between the mandrel and the sleeve, an external thread connecting piece is arranged at the shaft end of the mandrel, and an internal thread hole is formed in the bottom of the installation groove;

the mandrel is fixedly connected with the base through the matching of the external threaded connecting piece and the internal threaded hole, and the elastic body applies a fixed load to the movable part of the weighing sensor, so that the position of the movable part is fixed.

The utility model also provides an electronic balance which is characterized by comprising the weighing sensor with the transportation drop resistance mechanism.

The utility model has the positive progress effects that:

the utility model designs a structure for improving the shock resistance of the electromagnetic force balance type weighing sensor, which is provided with the anti-transportation drop mechanism, so that the weighing sensor is switched among a non-transportation state protection state, an overload protection state and a transportation protection state, and the load exceeding the compacting force of an elastomer can be directly transmitted to a base, thereby protecting the part with weak strength and avoiding collision and impact.

This construction improves the drop impact resistance during transport and the force exerted on the strength weakpoint is controlled by the amount of elastomer compression and does not exceed its yield strength.

Drawings

The above and other features, properties and advantages of the present utility model will become more apparent from the following description of embodiments taken in conjunction with the accompanying drawings in which like reference characters designate like features throughout the drawings, and in which:

FIG. 1 is a perspective view of a load cell with a transport fall mechanism of the present utility model.

Fig. 2 is a schematic structural view of a first embodiment of a load cell with a transportation fall mechanism according to the present utility model.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic view showing an internal structure of a load cell with a transportation fall mechanism according to an embodiment of the present utility model in a non-transportation protection state.

Fig. 5 is a cross-sectional view taken along line B-B in fig. 4.

Fig. 6 is a schematic view looking in the direction C in fig. 4.

Fig. 7 is a schematic view showing an internal structure of a mounting groove in a first embodiment of a load cell with a transportation fall mechanism according to the present utility model.

Fig. 8 is a schematic plan view of part D in fig. 7.

Fig. 9 is a cross-sectional view taken along line E-E in fig. 8.

FIG. 10 is a schematic view showing the assembly of the mandrel, sleeve and stop pin when the load cell with the anti-fall mechanism is in a non-shipping protection state.

Fig. 11 is an enlarged view of the portion F in fig. 10.

Fig. 12 is a schematic diagram of an embodiment of a load cell with a transportation fall mechanism according to the present utility model in a non-transportation protected state.

Fig. 13 is a schematic view showing an internal structure of the load cell with the anti-transportation fall mechanism according to the first embodiment of the present utility model in an overload protection state.

Fig. 14 is a cross-sectional view taken along line G-G in fig. 13.

Fig. 15 is a schematic view of fig. 13 viewed along direction H.

Fig. 16 is a schematic view showing the assembly of the mandrel, sleeve and stop pin when the first embodiment of the load cell with the anti-fall mechanism is in overload protection.

Fig. 17 is an enlarged view of the portion I in fig. 16.

Fig. 18 is a schematic diagram of an embodiment of a load cell with a transportation fall mechanism according to the present utility model in an overload protection state.

Fig. 19 is a schematic view showing the assembly of the mandrel, sleeve and stop pin when the load cell with the anti-fall mechanism is transited from overload protection state to transport protection state.

Fig. 20 is an enlarged view of a portion J in fig. 19.

Fig. 21 is a schematic view showing an internal structure of a load cell with a transportation fall mechanism according to an embodiment of the present utility model in a transportation protected state.

Fig. 22 is a cross-sectional view taken along line K-K in fig. 21.

Fig. 23 is a schematic view of fig. 21 viewed in the L direction.

Fig. 24 is a schematic view showing the assembly of the mandrel, sleeve and stop pin when the first embodiment of the load cell with the anti-fall mechanism is in the protected state.

Fig. 25 is an enlarged view of the portion M in fig. 24.

Fig. 26 is a schematic diagram of the load cell with the anti-fall mechanism in a protected state.

Fig. 27 is a schematic diagram of a second embodiment of a load cell with a transportation fall mechanism according to the present utility model.

Detailed Description

In order to make the above objects, features and advantages of the present utility model more comprehensible, embodiments accompanied with figures are described in detail below.

Embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

In addition, although terms used in the present utility model are selected from publicly known and commonly used terms, some terms mentioned in the specification of the present utility model may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.

Furthermore, it is required that the present utility model is understood, not simply by the actual terms used but by the meaning of each term lying within.

Embodiment one:

as shown in fig. 1 to 12, the present utility model discloses a load cell with a transportation fall-resistant mechanism, which includes a base 10, a spindle 20, an elastic body 30, a sleeve 40, a stopper pin 50, a scale pan bracket 60, and a scale pan joint 170. Meanwhile, the weighing sensor further comprises a lever limiting groove 100, a lever 110, a parallel guide piece 120, a lifting lug 130, a connecting upper node 140, a connecting lower node 150 and a supporting point 160.

Wherein, the base 10 is provided with a mounting groove 11, the scale bracket 60 is provided with a through hole 61, and the sleeve 40 passes through the through hole 61 and extends into the mounting groove 11. The spindle 20 is threaded into the sleeve 40, an elastomer 30 (where the elastomer 30 may preferably be a spring) is mounted between the spindle 20 and the sleeve 40, and a scale pan fitting 170 is mounted on top of the spindle 20. The limiting pin 50 is mounted at the end of the mandrel 20 and located outside the sleeve 40, and a plurality of limiting grooves 41 are formed in the end of the sleeve 40. A limit stopper 12 for restricting the position of the upward movement of the limit pin 50 is provided on the inner wall surface of the mounting groove 11.

When the scale pan joint 170 bears downward force and exceeds the pre-compression force of the elastic body 30, the weighing sensor enters an overload protection state, the limiting pin 50 moves downwards and is separated from the corresponding limiting groove 41 to be contacted with the base 10, and the base 10 bears load exceeding the compression force of the elastic body 30, so that the movable part of the weighing sensor is fixed in position.

When the weighing sensor is in a transportation protection state, the limiting pin 50 is in contact with the limiting baffle 12, the position of the limiting pin 50 is limited, the limiting pin 50 enters the corresponding limiting groove 41, and the elastic body 30 applies a fixed load to the movable part of the weighing sensor, so that the position of the movable part is fixed.

The movable parts comprise a lever 110, an upper connecting node 140, a lower connecting node 150, a fulcrum 160 and other weak parts, and the scale bracket 60 sequentially drives the lower connecting node 150, the upper connecting node 140, the lower connecting node 150, the fulcrum 160 and the lever 110, so that the lever 110 rotates to be tightly pressed with the upper part of the lever limiting groove 100.

Here, the limiting groove 41 may preferably be a U-shaped groove. For example, the end of the sleeve 40 may preferably be provided with four symmetrically distributed said U-shaped grooves.

The weighing sensor realizes the switching among a non-transportation protection state, an overload protection state and a transportation protection state through the cooperation of the limiting pins 50 and the corresponding limiting grooves 41. The non-transport protection state means that the movable part of the load cell is not fixed, and the load cell is in the process of not being transported. The overload protection state refers to that the load borne by the scale pan joint 170 of the weighing sensor exceeds the pre-compression force of the elastic body 30, and triggers an overload protection structure (including the structures of the mandrel 20, the elastic body 30, the sleeve 40, the limiting pin 50 and the like) to transmit the load exceeding the compression force of the elastic body to the base. The transportation protection state means that the load is removed from the scale pan connector 170 during the transportation process of the weighing sensor, and the transportation protection structure (including the structures of the mandrel 20, the elastic body 30, the sleeve 40, the limiting pin 50, and the like) applies a fixed load to the movable component by controlling the compression amount of the elastic body (such as a spring), so that the position of the movable component is fixed.

For example, the U-shaped slots in this embodiment may preferably include at least one pair of first U-shaped slots 411 and at least one pair of second U-shaped slots 412 that are oppositely disposed.

When the movable part of the weighing sensor is movable, the limiting pin 50 is positioned in the first U-shaped slot 411 and is spaced from the base 10. When the weighing sensor is in a transportation protection state, the limiting pin 50 is positioned in the second U-shaped groove 412, and a space is reserved between the limiting pin 50 and the bottom of the second U-shaped groove 412.

Further, the limit stop 12 extends horizontally outward along the inner wall surface above the limit pin 50.

Further, a first rotating shutter 13 is provided on the inner wall surface of the mounting groove 11 for defining the rotation angle of the spindle 20 when the load cell is switched from the overload protection state to the transport protection state.

In addition, it may be preferable that a second rotating shutter 14 is further provided on the inner wall surface of the mounting groove 11 for defining the rotation angle of the spindle 20 when the load cell is switched from the transportation protecting state to the non-transportation protecting state.

Preferably, the first rotating barrier 13 and the second rotating barrier 14 are vertically connected below the limit barrier 12.

As shown in fig. 4 to 12, the load cell with the transportation fall prevention mechanism is in a non-transportation protection state, hereinafter referred to as state 1. In the electromagnetic force balance type weighing sensor mechanism in the state 1, the lever 110 has a rotation degree of freedom, and the lever 110 can rotate within the limit range of the lever limit groove 100.

The lifting lug 130, the scale bracket 60, the elastic body 30, the mandrel 20, the sleeve 40 and the scale joint 170 can all move correspondingly within a certain range. If in this state during transportation, the movement of the movable member will collide with the lever stopper groove 100 to form an impact load. The weakest connecting upper node 140, connecting lower node 150, and fulcrum 160 in the member will deform or fracture when the impact load exceeds its yield strength, thereby affecting or completely disabling the load cell performance.

In the state 1, the limiting pin 50 is abutted upwards against the sleeve 40, the sleeve 40 is provided with a first U-shaped slot 411, and the limiting pin 50 is positioned in the first U-shaped slot 411 and used for limiting the rotation of the limiting pin 50 and the mandrel 20 in the state. There is no contact between the limit pin 50 and the base 10.

As shown in fig. 13 to 18, the load cell with the transportation fall protection mechanism is in a triggered overload protection state, hereinafter referred to as state 2. The working principle of the overload protection structure is as follows: the sleeve 40 and the spindle 20 constitute a pair of sliding pairs. The upper end of the mandrel 20 is rigidly connected with a scale pan joint 170 for carrying the weight of the object to be weighed of the electronic balance. The lower end of the mandrel 20 is rigidly connected to a stop pin 50. The elastomer 30 rests on the mandrel 20 at its upper end and on the sleeve 40 at its lower end, and the elastomer is pre-compressed. When the downward load carried by the scale pan connector 170 exceeds the pre-compression force of the elastic body, the scale pan connector 170, the mandrel 20 and the limiting pins 50 move downward until the limiting pins 50 are in contact with the sensor base 10. At this time, the load exceeding the pressing force of the elastic body can be directly transmitted to the base 10, thereby protecting the strength weak pieces such as the connection upper node 140, the connection lower node 150, the fulcrum 160, and the like.

In state 2, the scale pan joint 170 is subjected to a downward force, exceeding the pre-compression force of the elastomer, and the spindle 20 and the stop pin 50 move downward. The stopper pin 50 is separated from the first U-shaped slot 411 of the sleeve 40 and contacts the base 10, carrying a load exceeding the pressing force of the elastic body.

As shown in fig. 19 to 26, the load cell with the transportation fall prevention mechanism is in a transportation protection state, hereinafter referred to as state 3. In state 2, after the stopper pin 50 is rotated by a certain angle (90 degrees as shown in fig. 19 and 20), the load on the scale pan joint 170 is removed, and state 3 in fig. 21 is obtained.

That is, in the state 2, after the stopper pin 50 is removed from the first U-shaped slot 411 on the sleeve 40, the spindle 20 and the stopper pin 50 are rotated by a certain angle (90 degrees in the drawing).

At this time, the upper end of the limiting pin 50 will contact the limiting baffle 12, limiting the upward movement of the scale pan connector 170, the spindle 20, and the limiting pin 50, and giving a downward force to the scale pan connector 170. This force is transmitted through the mechanism, causing the lever 110 to rotate and the upper end of the lever-limiting groove 100 to compress.

In this state 3, compared to state 1, the lifting lug 130, the scale bracket 60, the elastic body 30, the spindle 20, the sleeve 40 and the scale pan joint 170 do not move freely, and collision and impact are avoided. The drop impact resistance during transportation can be improved. And the forces exerted on the strength weakpoint connection upper node 140, the connection lower node 150, and the fulcrum 160 are controlled by the amount of elastomer compression and do not exceed their yield strength.

In the state of fig. 19 and 20, after the load on the scale pan joint 170 is removed, the state 3 in fig. 21 to 26, that is, the state at the time of transportation protection is obtained. The limit pin 50 contacts the limit stop 12 on the base 10, limiting the upward movement of the limit pin 50. The stopper pin 50 is in the second U-shaped groove 412 of the sleeve 40, and the upper end of the stopper pin 50 is not in contact with the second U-shaped groove 412, and only the left-right rotation of the stopper pin 50 and the spindle 20 is restricted.

A first rotating shutter 13 is provided on the base 10, which defines the rotation angle of the spindle 20 when switching from state 2 to state 3, ensuring that the stop pin 50 falls in the second U-shaped groove 412 of the sleeve 40 after unloading the scale pan joint 170. Similarly, when switching from state 3 back to state 1, a second rotating baffle 14 is provided to ensure that the stop pin 50 can be positioned in the first U-shaped slot 411 after rotating the spindle 20.

When in transportation, the weighing sensor in the electronic balance is switched to the state 3, so that the anti-falling impact capability of the electronic balance can be effectively improved, and the electronic balance is not easy to damage during transportation. After the transportation is completed, the state 1 is switched, and the electronic balance and the weighing sensor can work normally. And when weighing is overloaded, the switch to the state 2 plays a role in overload protection.

Embodiment two:

as shown in fig. 27, the present utility model further provides a load cell with a transportation fall-resistant mechanism, which includes a base 10, a mandrel 20, an elastic body 30, a sleeve 40, a scale support 60 and a scale support 170, wherein a mounting groove 11 is formed on the base 10, a through hole 61 is formed on the scale support 60, and the sleeve 40 passes through the through hole 61 and extends into the mounting groove 11.

The mandrel 20 is inserted into the sleeve 40, the elastic body 30 is installed between the mandrel 20 and the sleeve 40, the shaft end of the mandrel 20 is provided with an external threaded connector 70, and the bottom of the installation groove 11 is provided with an internal threaded hole 80. The mandrel 20 is fixedly connected with the base 10 through the matching of the external threaded connecting piece 70 and the internal threaded hole 80, and the elastic body 30 applies a fixed load to the movable part of the weighing sensor, so that the position of the movable part is fixed. The weighing sensor enters a transportation protection state.

The load cell with the anti-fall-over-transit mechanism will incorporate an externally threaded connector 70 at the axial end of the spindle 20 and an internally threaded bore 80 in the base 10. During shipment, the externally threaded connector 70 may be threaded into the internally threaded bore 80. Because the screw thread can be self-locking, can not deviate from automatically after screwing in, can be with lug 130, scale pan support 60, elastomer 30, dabber 20, sleeve 40 and scale pan joint 170 are fixed to play transportation protection's effect, and can adjust the compression volume of elastomer through the degree of depth that the control screw thread was screwed in, in order to reach the benefit of selecting different clamp forces, adaptation different transportation conditions.

The utility model also provides an electronic balance comprising the weighing sensor with the transportation drop resisting mechanism.

According to the above structure description, the load cell with the transportation fall-resistant mechanism of the utility model has the following improvements:

1. the overload protection and transportation protection structure of the weighing sensor are combined together.

2. The elastic body applies a pressing force to the movable part, the pressing force is not larger than the overload force of the weighing system, the overload force is ensured by the elastic element, the force is controllable, and the sensitive part is not damaged.

3. The structure of elastomer and screw thread realizes that the power is adjustable, can deal with different transportation environment.

In summary, the weighing sensor with the anti-transportation fall mechanism and the electronic balance thereof have the advantages that the structure for improving the shock resistance of the electromagnetic force balance type weighing sensor is designed, the weighing sensor is switched among a non-transportation state protection state, an overload protection state and a transportation protection state, and the load exceeding the compaction force of an elastomer can be directly transmitted to the base, so that the part with weak strength is protected, and collision and impact are avoided.

This construction improves the drop impact resistance during transport and the force exerted on the strength weakpoint is controlled by the amount of elastomer compression and does not exceed its yield strength.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims (10)

1. The weighing sensor with the transportation drop-resistant mechanism is characterized by comprising a base, a mandrel, an elastic body, a sleeve, a limiting pin, a scale support and a scale joint, wherein a mounting groove is formed in the base, a through hole is formed in the scale support, and the sleeve penetrates through the through hole and extends into the mounting groove;

the elastic body is arranged between the mandrel and the sleeve in a penetrating mode, the scale pan joint is arranged at the end part of the mandrel, the limiting pin is arranged at the tail end of the mandrel and located outside the sleeve, a plurality of limiting grooves are formed in the tail end of the sleeve, and a limiting baffle is arranged on the inner wall surface of the mounting groove and used for limiting the upward moving position of the limiting pin;

when the scale pan connector bears downward force and exceeds the pre-compression force of the elastic body, the weighing sensor enters an overload protection state, the limiting pin moves downwards and is separated from the corresponding limiting groove to be in contact with the base, and the base bears load exceeding the compression force of the elastic body, so that the movable part of the weighing sensor is fixed in position;

when the weighing sensor is in a transportation protection state, the limiting pin is in contact with the limiting baffle plate to limit the position of the limiting pin, so that the limiting pin enters the corresponding limiting groove, and the elastic body applies a fixed load to the movable part of the weighing sensor to fix the position of the movable part.

2. The load cell with transport fall mechanism of claim 1, wherein the limit stop extends horizontally outward along the inner wall surface above the limit pin.

3. The load cell with transport fall mechanism of claim 1, wherein the limit slot is a U-shaped slot.

4. A load cell with a transportation fall mechanism as claimed in claim 3, wherein the end of the sleeve is provided with four symmetrically distributed U-shaped grooves.

5. The load cell with a transportation fall mechanism of claim 4, wherein the U-shaped channel comprises at least one pair of first U-shaped channels and at least one pair of second U-shaped channels arranged in opposition;

when the position of the movable part of the weighing sensor can move, the limiting pin is positioned in the first U-shaped groove and is spaced from the base; when the weighing sensor is in a transportation protection state, the limiting pin is positioned in the second U-shaped groove, and an interval is reserved between the limiting pin and the bottom of the second U-shaped groove.

6. The load cell with a transportation fall mechanism of claim 1, wherein a first rotating shutter is further provided on an inner wall surface of the mounting groove for defining a rotation angle of the spindle when the load cell is switched from the overload protection state to the transportation protection state.

7. The load cell with a transportation fall mechanism of claim 6, wherein a second rotating shutter is further provided on an inner wall surface of the mounting groove for defining a rotation angle of the spindle when the load cell is switched from the transportation protection state to the non-transportation protection state.

8. The load cell with a transport fall mechanism of claim 7, wherein the first rotating barrier and the second rotating barrier are connected vertically below the limit barrier.

9. The weighing sensor with the transportation drop-resistant mechanism is characterized by comprising a base, a mandrel, an elastomer, a sleeve and a scale bracket, wherein a mounting groove is formed in the base, a through hole is formed in the scale bracket, and the sleeve penetrates through the through hole and extends into the mounting groove;

the mandrel is arranged in the sleeve in a penetrating way, the elastomer is arranged between the mandrel and the sleeve, an external thread connecting piece is arranged at the shaft end of the mandrel, and an internal thread hole is formed in the bottom of the installation groove;

the mandrel is fixedly connected with the base through the matching of the external threaded connecting piece and the internal threaded hole, and the elastic body applies a fixed load to the movable part of the weighing sensor, so that the position of the movable part is fixed.

10. An electronic balance comprising a load cell with a transportation fall mechanism according to any one of claims 1-9.