Integrated plane bridge type weighing sensor

Abstract

An integrated plane bridge type weighing sensor comprises a sensor, an upper pressure head, a steel ball and a bottom plate, the sensor comprises an elastic body and a strain gauge, and the elastic body is an integrated piece composed of an upper bearing end, a lower fixing end and an integrated plane bridge body. An upward protruding part is arranged in the middle of the upper end face of the integrated plane bridge body and integrally connected with the middle of the lower end face of the upper bearing end to form a bearing body, and the left side and the right side of the lower end face of the integrated plane bridge body extend downwards to be integrally connected with the top face of the lower fixing end to form a supporting body. And the four strain gauges are arranged at the middle positions in the grooves and are connected with one another to form a Wheatstone bridge. The sensor is reasonable in structure and convenient to install, has good unbalance loading resistance, impact resistance and azimuth error resistance, has the advantages of a bridge type sensor, and is stable and reliable in performance, excellent in dynamic response performance, capable of self-resetting, high in adaptability and high in measurement precision.

Description

Technical Field

[0001] The utility model relates to a weighing device, in particular to an integrated planar bridge type weighing sensor, which is applicable to electronic weighing devices such as electronic truck scales, rail scales, tank scales and the like. Background Art

[0002] At present, bridge type sensors are widely used in various electronic weighing devices such as truck scales, rail scales, axle scales, tank scales and the like. The bridge type sensor has a large load capacity, can resist eccentric load, and the combined pressure head has the characteristics of self-resetting and center adjustment. Its performance is stable and reliable, the dynamic response performance is excellent, and the adaptability is strong.

[0003] For the existing bridge type sensor, the sensor and the base are fixedly connected by large bolts, as Figure 10 、 11 shown. The biggest defect of the bridge type sensor with such a structure is that the accuracy dispersion of the sensor is too large, and the stability is not ideal. If the fixing bolts are loose during long-term use, the product accuracy will decrease. In addition, due to the split structure of the existing bridge type sensor, there are technical problems such as low machining accuracy and complex product assembly.

[0004] After investigation, the existing Chinese utility model patent "A Bridge Type Sensor and a Scale Body" with the patent number CN231197294U includes a columnar elastic body, a bottom beam and a base. A strain gauge is arranged in the elastic body. A connecting layer is arranged between the elastic body and the bottom beam, and the connecting layer fixedly connects the elastic body and the bottom beam. The base is fixed at one end of the bottom beam away from the elastic body. A swing assembly is arranged on the top of the elastic body, and the swing assembly is used to contact an external scale body. A signal assembly for signal connection with an external measuring instrument is arranged on the elastic body. This sensor maintains the structure of the traditional bridge type sensor, and is simple and convenient to install and use, and has few installation conditions. However, the sensor and the base are also fixedly connected by bolts, and the above technical problems also exist. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide an integrated planar bridge type weighing sensor with a simple and reasonable structure, convenient processing and assembly, and having the characteristics of anti-eccentric load, anti-impact, strong adaptability and high measurement accuracy in view of the above technical status.

[0006] The first technical solution adopted by the present utility model to solve the above technical problems is as follows: An integrated planar bridge type weighing sensor, comprising a sensor, an upper pressure head, steel balls, and a bottom plate. The sensor includes an elastic body and strain gauges located on the elastic body. It is characterized in that: the elastic body is an integrated component composed of an upper bearing end, a lower fixed end, and an integrated planar bridge body. The integrated planar bridge body is arranged between the upper bearing end and the lower fixed end. In the middle of the upper end surface of the integrated planar bridge body, there is an upward convex portion integrally connected to the middle of the lower end surface of the upper bearing end to form a carrier. On the left and right sides of the lower end surface of the integrated planar bridge body, it extends downward and is integrally connected to the top surface of the lower fixed end to form a support body.

[0007] Preferably, four grooves for placing strain gauges are formed between the middle and the left and right sides of the upper end surface and the lower end surface of the integrated planar bridge body. The four strain gauges are arranged at the middle positions in the grooves and are connected to each other to form a Wheatstone bridge.

[0008] As an improvement, the integrated planar bridge body is a double cantilever bridge type structure symmetrically arranged in the front, back, left, and right directions. The front, back, left, and right of the integrated planar bridge body are flush with the upper bearing end and the lower fixed end. There is a certain distance between the left and right sides of the upper end surface of the integrated planar bridge body and the bottom surface of the upper bearing end. A hollow portion is formed between the middle of the lower end surface of the integrated planar bridge body and the top surface of the lower fixed end.

[0009] Furthermore, grooves are formed along the outer walls at the lower end of the upper bearing end of the sensor and the upper end of the lower fixed end. An integrally vulcanized protective cover is sleeved outside the sensor. The protective cover is a hollow structure with holes opened at the top and bottom that match the size of the sensor. The sensor is disposed through the protective cover, and the upper bearing end is exposed outside the protective cover. The lower hole of the protective cover matches the upper groove at the upper end of the lower fixed end, and the upper hole matches the lower groove at the lower end of the upper bearing end. An integrally protected and sealed structure is formed through the integrally vulcanized process.

[0010] Furthermore, a steel ball is provided between the upper bearing end and the upper pressure head. Spherical surfaces that abut against the steel ball and facilitate the rolling of the steel ball are respectively recessed on the upper end surface of the upper bearing end and the lower end surface of the upper pressure head.

[0011] Still further, a protective cover for limiting the steel ball is provided above the upper bearing end. The cross-section of the protective cover is square. A partial spherical hole that matches the spherical surface of the upper bearing end is formed through the middle of the protective cover. The protective cover is positioned and sleeved on the upper end of the upper bearing end. The partial spherical hole of the protective cover is connected to the spherical surface to form a ball socket structure for placing the lower part of the steel ball.

[0012] Still further, a positioning groove that penetrates left and right is recessed in the middle of the lower end of the protective cover for placing the upper end of the upper bearing end. The protective cover is sleeved on the upper end of the upper bearing end through the positioning groove.

[0013] Finally, fixed mounting holes are provided at the corner positions of the bottom plate, and fixed bolt holes are provided at the bottom corner positions of the lower fixed end. The bottom plate and the lower fixed end are fixed by bolts.

[0014] Compared with the prior art, the advantages of the present utility model are as follows: The elastomer is designed as an integrated planar double-cantilever bridge structure, eliminating the need for a base and large bolts for fixing and assembling, balancing the arm signal, stabilizing the data, and ensuring the product accuracy; The sensor bearing adopts an upper pressure head and steel ball structure, which can adapt to various weighing platform structures in the country, has strong adaptability, shock resistance, and can automatically reset; A protective cover is provided at the upper end of the upper bearing end to limit the steel balls; The lower fixed end and the bottom plate are fixed by bolts, restricting the 360-degree rotation and movement of the sensor in the front, rear, left, and right directions. The structure of the present utility model is simple and reasonable, easy to install, overcomes the congenital defect of low measurement accuracy of traditional bridge sensors, has good anti-eccentric load, anti-shock, and azimuth error capabilities, and at the same time has stable and reliable performance, excellent dynamic response performance, can self-reset, strong adaptability, and high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0016] Figure 2 is Figure 1 a longitudinal sectional view of;

[0017] Figure 3 Figure 1 exploded view of;

[0018] Figure 4 is a schematic structural diagram of the sensor elastomer

[0019] Figure 5 is Figure 4 a top view of;

[0020] Figure 6 is a schematic structural diagram of the upper pressure head;

[0021] Figure 7 is a schematic structural diagram of the bottom plate;

[0022] Figure 8 is a schematic structural diagram of the protective cover;

[0023] Figure 9 is Figure 8 a top view of;

[0024] Figure 10 schematic structural diagram of the integrally vulcanized protective cover;

[0025] Figure 11 schematic structural diagram of the traditional bridge sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 10 As shown, an integrated planar bridge weighing sensor includes a sensor, an upper pressure head 2, a steel ball 4 and a base plate 3. The sensor includes an elastomer 1 and a strain gauge located on the elastomer 1. The elastomer 1 is an integrated part consisting of an upper bearing end 11, a lower fixed end 12 and an integrated planar bridge body 13. The integrated planar bridge body 13 is arranged between the upper bearing end 11 and the lower fixed end 12. An upward protrusion is provided in the middle of the upper end surface of the integrated planar bridge body 13, which is integrally connected with the middle of the lower end surface of the upper bearing end 11 to form a bearing body. The left and right sides of the lower end surface of the integrated planar bridge body 13 extend downward and are integrally connected with the top surface of the lower fixed end 12 to form a supporting body. Preferably, four grooves 131 for inserting strain gauges are formed between the middle and left and right sides of the upper end surface and the lower end surface of the integrated planar bridge body 13. The four strain gauges are arranged in the middle position of the groove 131 and are interconnected to form a Wheatstone bridge.

[0028] The specific structure is as follows: the integral plane bridge body 13 is a double cantilever bridge body structure symmetrically arranged front and back, left and right, the integral plane bridge body 13 is flush with the upper bearing end 11 and the lower fixed end 12, there is a certain distance between the left and right sides of the upper end surface of the integral plane bridge body 13 and the bottom surface of the upper bearing end 11, and the middle part of the lower end surface of the integral plane bridge body 13 and the top surface of the lower fixed end form a hollow part. The cross section of the sensor is rectangular, and the lower end of the upper bearing end 11 and the upper end of the lower fixed end 12 are provided with rectangular grooves a and b along the outer wall, and the outer cover of the sensor is provided with an integral vulcanized protective cover 6, which is a hollow rectangular parallelepiped structure with rectangular holes in the upper and lower parts matching the size of the sensor, the sensor is arranged through the protective cover 6, and the upper bearing end 11 is exposed outside the protective cover 6, the lower rectangular hole of the protective cover 6 matches the upper rectangular groove b of the lower fixed end 12, and the upper rectangular hole matches the lower rectangular groove a of the upper bearing end 11, and an integral protective sealing structure is formed through an integral vulcanization process. The steel ball 4 is arranged between the upper bearing end 11 and the upper pressure head 2. The upper end surface of the upper bearing end 11 and the lower end surface of the upper pressure head 2 are respectively provided with spherical surfaces 111 and 21 which abut against the steel ball 4 and facilitate the rolling of the steel ball 4.

[0029] A shield 5 for limiting the steel ball 4 is provided above the upper bearing end 11. The cross-section of the shield 5 is square. A partial ball hole 51 is provided in the middle of the shield 5 to match the spherical surface 111 of the upper bearing end 11. A positioning groove 52 is recessed in the middle of the lower end of the shield 5 and is provided to penetrate left and right for the upper end of the upper bearing end 11 to be inserted. The shield 5 is sleeved on the upper end of the upper bearing end 11 through the positioning groove 52. The partial ball hole 51 of the shield 5 is connected with the spherical surface 111 to form a ball socket structure for the lower part of the steel ball 4 to be inserted. The lower part of the steel ball 4 is inserted into the ball socket and can roll in the ball socket.

[0030] The bottom plate 3 of this embodiment is a square plate. Installation holes 31 for fixing sensors are provided at the four corners of the bottom plate 3. Four fixing bolt holes are provided at the four corners of the bottom surface of the lower fixing end 12. Corresponding connecting counterbores 32 are provided on the bottom plate 3. The bottom plate 3 is fixed to the lower fixing end 12 by bolts, thus fixing the sensor on the bottom plate 3 and restricting the 360-degree rotation and movement of the sensor in the front, back, left, and right directions.

[0031] Waterproof connectors 7 are provided on the left and right sides of the upper bearing end 11.

[0032] The specific structure inside the sensor is the same as that of the prior art and will not be repeated here.

[0033] In this embodiment, the elastomer 1 is designed as an integral planar double-cantilever bridge structure, which does not require a base and large bolts for fixing and assembling, balances the force arm signals, stabilizes the data, and ensures the product accuracy; the sensor bearing adopts the structure of the upper pressure head 2 and the steel ball 4, which can adapt to various weighing platform structures in the country, has strong adaptability, shock resistance, and can automatically reset; a protective cover 5 is provided at the upper end of the upper bearing end 11 to limit the steel ball 5; the lower fixing end 12 and the bottom plate 3 are fixed by bolts, restricting the 360-degree rotation and movement of the sensor in the front, back, left, and right directions.

[0034] The structure of the present utility model is simple and reasonable, and the installation is convenient. It overcomes the congenital defect of low measurement accuracy of traditional bridge sensors, has good abilities of anti-offloading, anti-impact, and azimuth error, and at the same time has stable and reliable performance, excellent dynamic response performance, can self-reset, has strong adaptability, and high measurement accuracy.

[0035] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. An integrated planar bridge type weighing sensor, comprising a sensor, an upper pressure head, a steel ball and a bottom plate, wherein the sensor comprises an elastic body and a strain gauge located on the elastic body, characterized in that: The elastic body is an integral part consisting of an upper load-bearing end, a lower fixed end and an integral planar bridge body. The integral planar bridge body is arranged between the upper load-bearing end and the lower fixed end. An upward protrusion is provided in the middle of the upper end surface of the integral planar bridge body, which is integrally connected with the middle of the lower end surface of the upper load-bearing end to form a load-bearing body. The left and right sides of the lower end surface of the integral planar bridge body extend downward and are integrally connected with the top surface of the lower fixed end to form a support body.

2. The integrated planar bridge type weighing sensor according to claim 1, characterized in that: Four grooves for strain gauges are formed between the middle of the upper end surface and the lower end surface and the left and right sides of the one-piece planar bridge body. The four strain gauges are arranged in the middle position of the grooves and are interconnected to form a Wheatstone bridge.

3. The integrated planar bridge type weighing sensor according to claim 2, characterized in that: The one-piece planar bridge body is a double cantilever bridge structure that is symmetrically arranged front, back, left, and right. The front, back, left, and right sides of the one-piece planar bridge body are flush with the upper load-bearing end and the lower fixed end. There is a certain distance between the left and right sides of the upper end surface of the one-piece planar bridge body and the bottom surface of the upper load-bearing end, and the middle part of the lower end surface of the one-piece planar bridge body and the top surface of the lower fixed end form a hollow part.

4. The integrated planar bridge type weighing sensor according to claim 3, characterized in that: The lower end of the upper bearing end and the upper end of the lower fixed end of the sensor are provided with grooves along the outer wall. The sensor outer cover is provided with an integrated vulcanized protective cover. The protective cover is a hollow structure with holes in the upper and lower parts matching the size of the sensor. The sensor is arranged in the protective cover, and the upper bearing end is exposed outside the protective cover. The lower hole of the protective cover matches the upper groove of the lower fixed end, and the upper hole matches the lower groove of the upper bearing end. An integrated protective sealing structure is formed through an integrated vulcanization process.

5. The integrated planar bridge type weighing sensor according to any one of claims 1 to 4, characterized in that: The steel ball is arranged between the upper bearing end and the upper pressure head. The upper end surface of the upper bearing end and the lower end surface of the upper pressure head are respectively provided with spherical surfaces which abut against the steel ball and facilitate the rolling of the steel ball.

6. The integrated planar bridge type weighing sensor according to claim 5, characterized in that: A shield for limiting the position of the steel ball is provided above the upper bearing end. The cross-section of the shield is square. A partial ball hole matching the spherical surface of the upper bearing end is provided through the middle of the shield. The shield positioning sleeve is provided at the upper end of the upper bearing end. The partial ball hole of the shield is connected to the spherical surface to form a ball socket structure for the lower part of the steel ball to be placed.

7. The integrated planar bridge type weighing sensor according to claim 6, characterized in that: A positioning groove is concavely provided in the middle of the lower end of the shield and penetrates from left to right for the upper end of the upper bearing end to be placed therein, and the shield is sleeved on the upper end of the upper bearing end through the positioning groove.

8. The integrated planar bridge type weighing sensor according to any one of claims 1 to 4, characterized in that: A fixed installation hole is provided at a corner of the bottom plate, and a fixing bolt hole is provided at a corner of the bottom surface of the lower fixed end, and the bottom plate and the lower fixed end are fixed by bolts.

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