An elastic contact pad for a weighing sensor

Abstract

This utility model discloses an elastic contact pad for a weighing sensor, including a pad plate and a sensor body. A lower rubber liner is embedded in the upper end of the pad plate, and the sensor body is fixedly connected to the upper end of the lower rubber liner. An upper rubber liner is fixedly connected to the upper end of the sensor body. A base plate is correspondingly arranged at the lower end of the pad plate. Two side plates arranged symmetrically to the left and right are fixedly connected to the base plate by bolts. Shoulders are fixedly connected to both ends of the pad plate, and the shoulders abut against the side plates one by one. A guide and limiting component that cooperates with the corresponding side shoulder is arranged on the inner side of each side plate. Two overload protection components arranged symmetrically to the left and right are arranged between the pad plate and the base plate. This utility model enhances the protection capability of the weighing sensor under overload conditions by optimizing the structural design of the pad, thereby solving the problem of poor protection effect of existing elastic contact pads when dealing with loads exceeding the rated load, improving the protection performance of the sensor, and ensuring stable weighing operation.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary devices for weighing sensors, specifically to an elastic contact pad for a weighing sensor. This pad is mainly used to protect the weighing sensor during operation, especially in situations where the rated load is exceeded, ensuring the stable operation of the weighing sensor and extending its service life. Background Technology

[0002] As a device that converts mass signals into measurable electrical signals, load cells have wide and important applications in various fields such as industrial production, commercial trade, and logistics transportation. Among them, strain gauge load cells, which measure weight by utilizing the principle that the resistance of a strain gauge changes as it deforms, have become one of the most widely used types of load cells.

[0003] During the fixed installation of load cells, elastic contact pads are typically used to prevent damage from direct contact with the mounting structure and to reduce the impact of external vibrations and impacts on measurement accuracy and the load cell itself. However, while existing elastic contact pads can provide some cushioning, vibration damping, and protection for the load cell, when the weight exceeds the sensor's rated load significantly, the cushioning capacity of these pads alone is insufficient to effectively withstand excessive pressure. The load cell remains at significant risk of damage, which not only affects normal weighing operations but also increases the cost of equipment maintenance and replacement. Summary of the Invention

[0004] The purpose of this invention is to provide an elastic contact pad for a weighing sensor to solve the technical problem that existing elastic contact pads do not provide sufficient protection for the sensor when the load exceeds the rated load, which leads to easy damage to the sensor. This invention improves the protection performance of the sensor and ensures stable weighing operation.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an elastic contact pad for a weighing sensor, including a pad plate and a sensor body. A lower rubber liner is embedded in the upper end of the pad plate, and the lower rubber liner and the pad plate are connected by a tight snap-fit ​​connection. The sensor body is fixedly connected to the upper end of the lower rubber liner, and an upper rubber liner is fixedly connected to the upper end of the sensor body. A base plate is arranged correspondingly at the lower end of the pad plate. Two side plates arranged in a left-right correspondence are fixedly connected to the base plate by bolts. Shoulders are fixedly connected to the left and right ends of the pad plate, and the shoulders abut against the side plates one by one. A guide and limiting component that cooperates with the corresponding side shoulder is arranged on the inner side of each side plate. Two overload protection components arranged symmetrically on the left and right are arranged between the pad plate and the base plate.

[0006] Each overload protection component includes a top, a sleeve, and a spring. The top is fixedly connected to the pad, the sleeve is coaxially arranged with the top and can be inserted, the inner diameter of the sleeve is larger than the outer diameter of the top, the spring is coaxially arranged with the sleeve, the lower end of the spring is fixedly connected to the base plate, and the upper end of the spring is movably abutting against the top.

[0007] Each of the guide and limiting components includes a guide rail that is fixedly connected to the inner wall of the side plate. The guide rail is arranged vertically, and the end of the shoulder is provided with a slot that slides with the guide rail on the corresponding side. The size of the slot matches the size of the guide rail.

[0008] The base plate has countersunk holes for bolt engagement.

[0009] This utility model presents an elastic contact pad for a weighing sensor designed using the aforementioned technical solution. The aim is to enhance the pad's protective capability against overload conditions by optimizing its structural design, thereby solving the problem of poor protection performance of existing elastic contact pads when dealing with loads exceeding the rated load. Its beneficial effects are as follows:

[0010] 1. The upper and lower rubber pads provided in this utility model can provide good buffering and vibration reduction for the sensor body during the weighing process, so that the sensor body is subjected to uniform force. At the same time, the deformation capacity of the rubber pads can effectively reduce the impact of external vibration and impact on the sensor body, provide preliminary protection for the sensor body, and ensure the measurement accuracy and service life of the sensor.

[0011] 2. The overload protection component is a major highlight of this utility model. The spring in the overload protection component is in a compressed state in the initial state. When the load exceeds the rated load of the sensor body, the spring will be further compressed. At the same time, the pad, together with the sensor body and other related components, will sink stably under the guidance of the guide and limit component. The excess pressure is absorbed by the further deformation of the spring, avoiding excessive pressure acting directly on the sensor body, thereby effectively protecting the sensor body from overload and greatly reducing the risk of damage to the sensor body due to overload.

[0012] 3. The cooperation between the guide rail and the slot in the guide and limit assembly can not only provide accurate guidance for the vertical movement of the pad, ensuring that the pad can sink in the preset direction when overloaded, but also effectively limit the horizontal displacement of the pad, prevent the pad from shifting horizontally during operation, and ensure the structural stability and operational reliability of the entire device.

[0013] 4. The countersunk holes on the base plate allow the bolt heads to be recessed into the base plate without affecting the fit between the base plate and the external installation structure, ensuring the stability of the entire device installation. At the same time, it also prevents the bolt heads from being damaged by external impacts, thus improving the overall safety of the device.

[0014] 5. The present invention has a simple overall structure, reliable and easy-to-implement connection between components, convenient installation and disassembly, easy maintenance and upkeep, strong practicality, and can be widely used in various occasions where weighing sensors are used. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the main structural features of the present invention.

[0016] Figure 2 This is a three-dimensional schematic diagram of a partial structure of the present invention;

[0017] Figure 3 A schematic diagram showing the three-dimensional structure of this utility model;

[0018] Figure 4 This is a schematic diagram showing the second three-dimensional structure of the present invention.

[0019] In the diagram: 1-pad, 2-sensor body, 3-lower rubber pad, 4-upper rubber pad, 5-base plate, 6-bolt, 7-side plate, 8-shoulder, 9-guide limit assembly, 10-overload protection assembly, 11-top, 12-sleeve, 13-spring, 14-guide rail, 15-slot, 16-countersunk hole. Detailed Implementation

[0020] The following description, in conjunction with the accompanying drawings, details an elastic contact pad for a weighing sensor according to this utility model.

[0021] This utility model relates to an elastic contact pad for a weighing sensor, see [link to relevant documentation]. Figures 1 to 4The device includes a pad 1 and a sensor body 2. A lower rubber pad 3 is embedded in the upper end of the pad 1, and the lower rubber pad 3 is tightly connected to the pad 1 to effectively prevent displacement of the lower rubber pad 3 during use and ensure structural stability. The sensor body 2 is fixedly connected to the upper end of the lower rubber pad 3. The sensor body 2 and the lower rubber pad 3 can be fixed together by means of adhesive bonding, bolt connection, etc., to ensure that the sensor body 2 will not move relative to the lower rubber pad 3 during operation, thereby ensuring measurement accuracy. An upper rubber pad 4 is fixedly connected to the upper end of the sensor body 2. The upper rubber pad 4 can also be connected to the sensor body 2 by adhesive bonding or bolt connection. The upper rubber pad 4 not only makes direct contact with the object being weighed during weighing, acting as a buffer, but also evenly transfers the weight to the sensor body 2. A base plate 5 is arranged at the lower end of the pad 1, providing a stable support foundation for the entire device. The base plate 5 is fixedly connected to two side plates 7 arranged symmetrically to the left and right by bolts 6. The number of bolts 6 can be determined according to the actual situation. Generally, each side plate 7 is fixed with at least two bolts 6 to ensure the firmness of the connection between the side plate 7 and the base plate 5 and to prevent the side plate 7 from loosening during use. Shoulders 8 are fixedly connected to both ends of the pad 1. The shoulders 8 and the pad 1 can be connected by integral molding or welding. Integral molding ensures the strength and stability of the connection between the shoulders 8 and the pad 1, while welding is suitable for some special structures or materials. The shoulders 8 and the side plates 7 abut against each other. Through the abutment cooperation between the shoulders 8 and the side plates 7, the horizontal displacement of the pad 1 can be limited to prevent the pad 1 from shifting horizontally during operation. Guide limiting components 9 are arranged on the inner side of each side plate 7 to cooperate with the corresponding side shoulders 8. The guide limiting components 9 can guide the vertical movement of the pad 1 and further limit the horizontal displacement of the pad 1, ensuring that the pad 1 can sink stably in the preset direction under overload conditions. Two overload protection components 10 are arranged in a left-right correspondence between the pad 1 and the base plate 5. The two overload protection components 10 are symmetrically arranged, which can make the pad 1 bear the force evenly when it is subjected to pressure, and avoid damage to the device due to uneven force.

[0022] The overload protection assembly 10 of this utility model includes a top head 11, a sleeve 12, and a spring 13. The top head 11 is fixedly connected to the pad 1. The top head 11 and the pad 1 can be connected by welding or threaded connection. Threaded connection facilitates the installation and disassembly of the top head 11, making it convenient for later maintenance and replacement. The sleeve 12 is coaxially arranged with the top head 11 and can be inserted. The inner diameter of the sleeve 12 is slightly larger than the outer diameter of the top head 11, ensuring that the top head 11 can slide smoothly within the sleeve 12. At the same time, the sleeve 12 can restrict the movement direction of the top head 11 to prevent the top head 11 from deviating. The spring 13 is coaxially arranged with the sleeve 12, and the lower end of the spring 13 is fixedly connected to the base plate 5. The spring 13 and the base plate 5 can be fixed by welding or by setting a spring seat. The spring seat can provide stable support for the spring 13 and prevent the spring 13 from displacing during compression and extension. The upper end of the spring 13 is in movable contact with the top head 11. This movable contact allows the top head 11 to compress the spring 13 under pressure, while the top head 11 can return to its initial position under the elastic force of the spring 13.

[0023] The guide and limiting assembly 9 of this utility model includes a guide rail 14 fixedly connected to the inner wall of the side plate 7. The guide rail 14 and the inner wall of the side plate 7 can be fixed by bolt connection or welding. Bolt connection facilitates the installation and adjustment of the guide rail 14, while welding ensures the strength of the connection. The guide rail 14 is arranged vertically to ensure accurate guidance for the vertical movement of the pad 1. The end of the shoulder 8 is provided with a groove 15 that slides with the guide rail 14 on the corresponding side. The size of the groove 15 matches the size of the guide rail 14, so that the shoulder 8 can slide smoothly along the guide rail 14. At the same time, the cooperation between the groove 15 and the guide rail 14 can further limit the horizontal displacement of the pad 1 and ensure the stability of the device.

[0024] This utility model also provides a countersunk hole 16 on the base plate 5 to cooperate with the bolt 6. The countersunk hole 16 allows the head of the bolt 6 to be recessed into the base plate 5, preventing the head of the bolt 6 from protruding from the surface of the base plate 5, thus not affecting the fit between the base plate 5 and the external installation structure, ensuring the stability of the entire device installation, and also preventing the head of the bolt 6 from being damaged by external impact.

[0025] Example 1

[0026] When using this utility model, the device first needs to be assembled. The assembly process is as follows:

[0027] The lower rubber pad 3 is inserted into the upper end of the pad 1 to ensure that the lower rubber pad 3 and the pad 1 are tightly fitted without any looseness.

[0028] The sensor body 2 is fixedly connected to the upper end of the lower rubber pad 3. The appropriate connection method can be selected according to the actual situation. For example, high-strength glue can be used to bond and fix the sensor body 2 to the lower rubber pad 3, or the two can be connected by bolts. When connecting with bolts, attention should be paid to the tightening force of the bolts to avoid damaging the sensor body 2 due to over-tightening.

[0029] A rubber pad 4 is fixedly connected to the upper end of the upper sensor body 2. The connection method can be the same as the connection method between the sensor body 2 and the lower rubber pad 3, ensuring that the upper rubber pad 4 and the sensor body 2 are firmly connected and will not be displaced during the weighing process.

[0030] Place the base plate 5 on a horizontal mounting surface, and then fix the two side plates 7 to the left and right sides of the base plate 5 respectively with bolts 6. After the bolts 6 pass through the bolt holes on the side plates 7, screw them into the corresponding threaded holes on the base plate 5. When tightening the bolts 6, ensure that the two side plates 7 are tightly connected to the base plate 5 and that the two side plates 7 are arranged symmetrically from left to right. At the same time, make sure that the head of the bolt 6 is sunk into the countersunk hole 16 on the base plate 5 to avoid the head of the bolt 6 protruding.

[0031] Place the assembled sensor body 2, upper rubber pad 4, and lower rubber pad 3 between the two side plates 7, so that the shoulders 8 at the left and right ends of the pad 1 abut against the corresponding side plates 7 one by one, while ensuring that the slots 15 at the ends of the shoulders 8 slide with the guide rails 14 on the inner side of the side plates 7, that is, the guide rails 14 are embedded in the slots 15, ensuring that the pad 1 can slide smoothly along the guide rails 14.

[0032] An overload protection assembly 10 is installed between the pad 1 and the base plate 5. The top head 11 is fixedly connected to the lower end of the pad 1. Then, the sleeve 12 is placed on the base plate 5 at the position corresponding to the top head 11, and the sleeve 12 and the top head 11 are made coaxial. Next, the spring 13 is placed inside the sleeve 12, and the lower end of the spring 13 is fixedly connected to the base plate 5. The upper end of the spring 13 is in contact with the top head 11. At this time, the spring 13 is in a compressed state, and its reaction force on the pad 1 is adjusted to be equal to the rated load of the sensor body 2.

[0033] Once the device is assembled, it can be put into use. In a non-load-bearing state, since the reaction force of the spring 13 on the pad 1 is equal to the rated load of the sensor body 2, under the elastic force of the spring 13, the shoulder 8 of the pad 1 abuts against the side plate 7. With the cooperation of the guide rail 14 and the slot 15 in the guide limiting assembly 9, the pad 1 is stabilized in the current position, and the entire device is in a stable standby state.

[0034] During weighing, the object to be weighed is placed on the upper rubber pad 4. The upper rubber pad 4 evenly transfers the weight to the sensor body 2, which then converts the mass signal into a measurable electrical signal output, thus achieving weight measurement. In this process, the upper rubber pad 4 and the lower rubber pad 3 utilize their elastic deformation to buffer and dampen the sensor body 2, reducing the impact of the object being weighed and external vibrations on the sensor body 2, ensuring the measurement accuracy and normal operation of the sensor body 2.

[0035] When the weight of the object being weighed exceeds the rated load of the sensor body 2, the pressure on the sensor body 2 increases. This pressure is transmitted to the pad 1, causing the pad 1 to tend to move downwards. Since the pressure is greater than the initial reaction force of the spring 13, the spring 13 is further compressed. At the same time, under the action of the guide limiting component 9, i.e., the groove 15 on the shoulder 8, the pad 1 slides downwards along the guide rail 14 on the inner side of the side plate 7. The pad 1, together with the sensor body 2, the upper rubber pad 4, and the lower rubber pad 3, sinks steadily. During the sinking process, the spring 13 absorbs the excess pressure through further deformation, preventing excessive pressure from acting directly on the sensor body 2, thereby providing effective overload protection for the sensor body 2 and preventing damage to the sensor body 2 due to overload.

[0036] When the weighing operation is completed and the weighed object is removed, the spring 13 gradually returns to its original shape under the action of its own elastic force, pushing the top head 11 to move upward. The top head 11 drives the pad 1 and the sensor body 2, upper rubber pad 4 and lower rubber pad 3 on the pad 1 to move upward together until the shoulder 8 of the pad 1 abuts against the side plate 7 again. The device returns to the initial standby state and waits for the next weighing operation.

[0037] Example 2

[0038] Based on Embodiment 1, this embodiment further optimizes the structure and installation method of the guide and limit component 9.

[0039] The guide rail 14 in the guide limiting assembly 9 is made of high-strength alloy material, which has high wear resistance and strength, and can withstand the friction and impact forces generated by the pad 1 during movement, thus extending the service life of the guide rail 14. The guide rail 14 is bolted to the inner wall of the side plate 7. Threaded holes for the bolts are opened on the inner wall of the side plate 7. After the bolts pass through the mounting holes on the guide rail 14, they are screwed into the threaded holes of the side plate 7 to fix the guide rail 14. To ensure the verticality and accuracy of the guide rail 14 installation, a level and a right-angle ruler are used for calibration during installation to ensure that the guide rail 14 is arranged vertically and perpendicular to the inner wall of the side plate 7, thereby ensuring that the pad 1 can move smoothly and accurately along the guide rail 14.

[0040] A wear-resistant pad is attached to the inner wall of the groove 15 at the end of the shoulder 8. The wear-resistant pad is made of polytetrafluoroethylene (PTFE). PTFE has excellent wear resistance and a low coefficient of friction, which can reduce the frictional resistance between the groove 15 and the guide rail 14, making the movement of the pad 1 smoother. At the same time, it can also prevent the groove 15 and the guide rail 14 from being damaged due to long-term friction, thereby improving the overall service life of the guide limit assembly 9.

[0041] In addition, buffer blocks are provided at the upper and lower ends of the guide rail 14. The buffer blocks are made of rubber material and are fixed to the ends of the guide rail 14 by adhesive bonding.

Claims

1. An elastic contact pad for a weighing sensor, comprising a pad plate and a sensor body, characterized in that: The upper end of the pad is fitted with a lower rubber pad, and the lower rubber pad and the pad are connected by a tight snap-fit ​​connection. The sensor body is fixedly connected to the upper end of the lower rubber pad, and the upper end of the sensor body is fixedly connected with an upper rubber pad. A base plate is arranged correspondingly at the lower end of the pad. The base plate is fixedly connected with two side plates arranged in a left-right orientation by bolts. Shoulders are fixedly connected to the left and right ends of the pad, and the shoulders abut against the side plates one by one. Each side plate has a guide and limiting component that cooperates with its corresponding side shoulder. Two overload protection components are arranged symmetrically between the pad and the base plate.

2. The elastic contact pad of a weighing sensor according to claim 1, characterized in that... Each overload protection component includes a top, a sleeve, and a spring. The top is fixedly connected to the pad, the sleeve is coaxially arranged with the top and can be inserted, the inner diameter of the sleeve is larger than the outer diameter of the top, the spring is coaxially arranged with the sleeve, the lower end of the spring is fixedly connected to the base plate, and the upper end of the spring is movably abutting against the top.

3. The elastic contact pad of a weighing sensor according to claim 1, characterized in that... Each of the guide and limiting components includes a guide rail that is fixedly connected to the inner wall of the side plate. The guide rail is arranged vertically, and the end of the shoulder is provided with a slot that slides with the guide rail on the corresponding side. The size of the slot matches the size of the guide rail.

4. The elastic contact pad of a weighing sensor according to claim 1, characterized in that... The base plate has countersunk holes for bolt engagement.

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