SMD (Surface Mount Device) type resistance strain sensor and bearing equipment

Abstract

The utility model relates to a paster type resistance strain sensor and bearing equipment, comprising bases, a sensor body and a dust cover, the two bases are oppositely arranged and have a gap, the sensor body comprises a sensor elastomer, a full-bridge type measuring bridge and a sensor protection cover, the sensor elastomer is arranged at the top ends of the two bases and two ends of the sensor elastomer, and the full-bridge type measuring bridge is arranged on the dust cover. The middle of the sensor elastic body is suspended in the gap between the two bases, the full-bridge measuring bridge is arranged on the sensor elastic body, the sensor protective cover wraps the sensor elastic body, and the dustproof cover is arranged outside the two bases and the sensor body in a sleeving mode and detachably connected with the two bases. According to the scheme, the appropriate sensor assembly is selected and matched according to the conditions of detection points and different technical requirements, when the sensor assembly works in a full-load mode, the sensitivity value of the sensor reaches 10-50 mv / 10 v, the sensitivity value of the sensor is 2-3 times higher than that of a common sensor under the same load condition, and the system has high detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a patch type resistance strain sensor and a bearing device with the patch type resistance strain sensor. Background Art

[0002] Resistive strain sensors are often used to measure the weight borne by equipment. In the production process, in order to ensure the safety of the equipment, the sensor must be properly installed in the equipment so that the sensor bears the full weight of the equipment. The load information is obtained by the sensor to monitor the safe production and operation of the equipment. In the process of selecting sensors, large-load sensors are often selected, which results in a relatively large size of the sensor, and the installation of the sensor is time-consuming and laborious. At the same time, in special circumstances, it is difficult to install the sensor into the equipment. At the same time, in order to prevent the sensor from being damaged due to overload and affecting the safe use of the equipment, additional safety protection measures must be added, which will bring many inconveniences. Utility Model Content

[0003] In view of the above problems, the utility model provides a patch type resistance strain sensor and a carrying device having the patch type resistance strain sensor. The slight deformation of the carrying device is used to cause the elastic body of the sensor to deform and trigger an initial signal. The signal obtains the weight information carried by the equipment through a secondary instrument, thereby performing safety monitoring of production and operations.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A patch type resistance strain sensor comprises a base, a sensor body and a dust cover, wherein the base is a pair, the two bases are arranged opposite to each other and have a gap, the sensor body comprises a sensor elastomer, a full-bridge measuring bridge and a sensor protection cover, the sensor elastomer is arranged at the top of the two bases, the two ends of the sensor elastomer are respectively detachably connected to the two bases, the middle part of the sensor elastomer is suspended in the gap between the two bases, the full-bridge measuring bridge is arranged on the sensor elastomer, the sensor protection cover is wrapped outside the sensor elastomer, and the dust cover is sleeved outside the two bases and the sensor body and is detachably connected to the two bases.

[0006] In a preferred embodiment of the utility model, six strain zones are provided on the sensor elastomer, and the sensor elastomer is divided into three sections, namely, a left section, a middle section, and a right section, along the central axis, and the structures of each section are symmetrically distributed up and down, and the upper and lower parts of the middle section are concave-shaped, the left section is provided with a first strain zone connected to the upper part of the middle section, the lower part of the left section is provided with a second strain zone connected to the lower part of the middle section and symmetrical with the first strain zone up and down, the right section is provided with a fifth strain zone connected to the upper part of the middle section, and the lower part of the right section is provided with a sixth strain zone connected to the lower part of the middle section and symmetrical with the fifth strain zone up and down, a third strain zone is provided between the first strain zone and the fifth strain zone, and a fourth strain zone is provided between the second strain zone and the sixth strain zone, and the strain gauges of the full-bridge measuring bridge are respectively arranged on both sides of the third strain zone and the fourth strain zone of the middle section, and the two ends of each strain zone are connected to the sensor elastomer by arc transition.

[0007] In order to facilitate the installation and removal of the sensor elastic body, the left section and the right section of the sensor elastic body are detachably connected to the base via bolts.

[0008] In order to facilitate the wire outlet, a lock coil for the wire outlet of the sensor body is provided on the dust cover.

[0009] In order to prevent the heat of the equipment from affecting the use environment of the sensor, the bottom end of the base is provided with heat insulation cotton, and the heat insulation cotton is correspondingly arranged at the lower end of the sensor body.

[0010] In order to facilitate the installation and fixation of the sensor and the equipment, a plurality of C-shaped grooves are provided on both sides of the base.

[0011] In order to facilitate the disassembly and assembly of the dust cover so as to detect or repair the sensor body, both ends of the dust cover are detachably connected to the base via bolts.

[0012] The utility model also provides a bearing device, on the surface of which the above-mentioned patch type resistance strain sensor is installed;

[0013] Furthermore, the patch type resistance strain sensor is fixed to the surface of the supporting equipment by a plurality of bolts.

[0014] The beneficial effects of the utility model are:

[0015] (1) Through the above scheme, according to the conditions of the detection point and different technical requirements (the allowable installation size range of the detection point, the strain value of the detection point, etc.), a suitable sensor assembly is selected so that when the sensor assembly is fully loaded, the sensor sensitivity value reaches 10-50mv / 10v, which is 2-3 times greater than the general sensor sensitivity under the same load conditions, so that the system has a higher detection accuracy;

[0016] (2) The sensor assembly is fixed with bolts or welded, which greatly simplifies the installation of the sensor assembly. No matter how large the detection load value is, it will not affect the normal operation of the equipment. The sensor assembly is installed on the upper surface of the equipment, and the sensor only bears very small force, so it has the characteristics of high safety and strong adaptability.

[0017] (3) Without changing the equipment structure, it has the characteristics of high safety and strong adaptability; it can bear large loads; it is used for equipment with limited installation space and equipment structure modification conditions; it can be used to limit overload and underload and monitor the deflection, deformation and other parameters of the components; the assembly of the sensor assembly components is changed to assembly in the factory to ensure the matching requirements between the components and the installation quality such as sealing and heat insulation, which reduces the impact of various uncertain factors caused by on-site installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the front view of the patch type resistance strain sensor of the utility model

[0019] Figure 2 It is a top view of the patch type resistance strain sensor of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the sensor elastic body of the utility model;

[0021] Figure 4 It is a schematic diagram of the structure of the patch type resistance strain sensor of the utility model when it is installed on a carrying device. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more specific definition of the protection scope of the present invention. The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., are only for reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, rather than to limit the present invention.

[0023] Embodiment 1:

[0024] like Figure 1 , Figure 2A patch-type resistive strain sensor shown in the figure includes a base 1, a sensor body and a dust cover 4, the base 1 is a pair, the two bases 1 are arranged opposite to each other and have a gap, the base 1 can be installed on the equipment by bolts 7, the bottom end of the base 1 is provided with insulation cotton 5, the insulation cotton 5 is correspondingly arranged at the lower end of the sensor body, and a number of C-shaped grooves 10 are opened on both sides of the base, the sensor body includes a sensor elastomer 2, a full-bridge measurement bridge and a sensor protection cover 4, the sensor elastomer 2 is arranged at the top of the two bases 1, the two ends of the sensor elastomer 2 are detachably connected to the two bases 1 by bolts 6, the middle part of the sensor elastomer 2 is suspended in the gap between the two bases 1, the full-bridge measurement bridge is arranged on the sensor elastomer 2, the sensor protection cover 3 is wrapped around the suspended part of the sensor elastomer 2, the dust cover 4 is sleeved outside the two bases 1 and the sensor body and is detachably connected to the two bases 1 by bolts 8, and the dust cover 4 is provided with a lock coil 9 for the sensor body output line.

[0025] Specifically, combined Figure 3 As shown, the sensor elastomer 2 is provided with six strain zones. The sensor elastomer 2 is divided into three sections, namely, a left section, a middle section and a right section, along the central axis. The structures of the sections are symmetrically distributed up and down. The upper and lower parts of the middle section are in a concave shape. The left section is provided with a first strain zone 2a connected to the upper part of the middle section. The lower part of the left section is provided with a second strain zone 2b connected to the lower part of the middle section and symmetrical with the first strain zone 2a up and down. The right section is provided with a fifth strain zone 2e connected to the upper part of the middle section. The lower part of the right section is provided with a sixth strain zone 2f connected to the lower part of the middle section and symmetrical with the fifth strain zone 2e up and down. A third strain zone 2c is provided between the first strain zone 2a and the fifth strain zone 2e. A fourth strain zone 2d is provided between the second strain zone 2b and the sixth strain zone 2f. Both ends of each strain zone are connected to the sensor elastomer 2 by arc transition. The strain gauges 11 of the full-bridge measuring bridge are respectively arranged on both sides of the third strain zone 2c and the fourth strain zone 2d of the middle section.

[0026] According to the conditions of the detection point and different technical requirements, the thickness of the sensor elastomer 2 is 5-25mm, the width is 30-100mm, the length of the middle strain zone is 10-50mm, the length of the left and right strain zones is the same, the thickness of the third strain zone 2c and the fourth strain zone 2d is 0.5-10mm, the thickness of the base 1 is 10-40mm, the width of the base 1 is 20-120mm, and the length of the base 1 is 50-700mm.

[0027] The above structure can cause the sensor elastomer 2 to deform and trigger an initial output signal, so that the weight information carried by the equipment can be obtained through the secondary instrument. The base 1 is provided with C-shaped grooves 10 and screw holes for installation directly fixed by bolts on both sides along the length direction of the sensor body. The C-shaped grooves 10 can increase the contact area between the base 1 and the load-bearing device, so that the base 1 is firmly welded to the load-bearing device, and the sensor is stably fixed on the load-bearing device. When the base 1 is welded to the load-bearing device, it is equipped with a welding installation positioning plate to avoid the internal stress of the sensor body caused by welding, and improve the accuracy of the detection value. The dust cover 4 is fixed to the base 1 by bolts, and the dust cover 4 can be easily disassembled to detect or repair the sensor body in the cover. Sealant is applied between the dust cover 4 and the base 1, and between the dust cover 4 and the load-bearing device to seal, which plays the role of sealing, moisture-proof and heat insulation.

[0028] Embodiment 2:

[0029] like Figure 4 As shown, this embodiment provides a load-bearing device B, on the surface of which the above-mentioned patch-type resistance strain sensor A is installed by a number of bolts. The deformation of the detection point on the load-bearing device B and the installation size of the measurement point are calculated, so that the elastic body of the patch-type resistance strain sensor A is deformed due to the slight deformation of the load-bearing device B during load-bearing, so that the full-bridge measurement bridge on the elastic body generates an output, and the weight information carried by the device is obtained through the secondary instrument.

[0030] The chip resistance strain sensor A is fixed on the carrier device B by bolt fixing or welding process. The welding points are located at the C-shaped grooves on both sides of the base along the length direction of the sensor; the connecting wire is connected to the secondary instrument through the locking coil on the dust cover for the output wire of the sensor body; the dust cover and the base, as well as the dust cover and the carrier device are sealed with sealant to play the role of sealing, moisture-proof and heat insulation.

[0031] The chip resistance strain sensor is used for overload limit of 110-ton trolley. QCX-M instrument is adopted. The chip resistance strain sensor is installed on the upper surface of the middle part of the fixed pulley beam supporting the fixed pulley of the crane. The chip resistance strain sensor is fixed to the upper surface of the fixed pulley beam by bolts. The size of the sensor elastomer is 12mm long in the middle section, 0.7mm thick in the third elastic strain zone, and the sensor mounting base is 110mm long and 90mm wide.

[0032] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set", "provided with", etc. 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A patch type resistance strain sensor, characterized in that: It includes a base, a sensor body and a dust cover, the base is a pair, the two bases are arranged opposite to each other and have a gap, the sensor body includes a sensor elastomer, a full-bridge measuring bridge and a sensor protection cover, the sensor elastomer is arranged at the top of the two bases, the two ends of the sensor elastomer are respectively detachably connected to the two bases, the middle part of the sensor elastomer is suspended in the gap between the two bases, the full-bridge measuring bridge is arranged on the sensor elastomer, the sensor protection cover is wrapped outside the sensor elastomer, and the dust cover is sleeved outside the two bases and the sensor body and is detachably connected to the two bases.

2. The chip-type resistance strain sensor according to claim 1, characterized in that: The sensor elastomer is provided with six strain zones. The sensor elastomer is divided into three sections, namely, a left section, a middle section and a right section, along the central axis. The structures of the sections are symmetrically distributed up and down. The upper and lower parts of the middle section are in a concave shape. The left section is provided with a first strain zone connected to the upper part of the middle section. The lower part of the left section is provided with a second strain zone connected to the lower part of the middle section and symmetrical to the first strain zone up and down. The right section is provided with a fifth strain zone connected to the upper part of the middle section. The lower part of the right section is provided with a sixth strain zone connected to the lower part of the middle section and symmetrical to the fifth strain zone up and down. A third strain zone is provided between the first strain zone and the fifth strain zone. A fourth strain zone is provided between the second strain zone and the sixth strain zone. The strain gauges of the full-bridge measuring bridge are respectively arranged on both sides of the third strain zone and the fourth strain zone of the middle section. The two ends of each strain zone are connected to the sensor elastomer by an arc transition.

3. The chip-type resistance strain sensor according to claim 2, characterized in that: The left section and the right section of the sensor elastic body are detachably connected to the base via bolts.

4. The chip-type resistance strain sensor according to claim 2, characterized in that: The dust cover is provided with a lock coil for the output line of the sensor body.

5. The chip-type resistance strain sensor according to claim 2, characterized in that: The bottom end of the base is provided with heat insulation cotton, and the heat insulation cotton is correspondingly arranged at the lower end of the sensor body.

6. The chip-type resistance strain sensor according to claim 2, characterized in that: A plurality of C-shaped grooves are arranged on both sides of the base.

7. The chip-type resistance strain sensor according to claim 2, characterized in that: The two ends of the dust cover are detachably connected to the base via bolts.

8. A bearing device, characterized in that: The surface of the carrier device is mounted with a patch type resistance strain sensor as described in any one of claims 1 to 7.

9. The carrying device according to claim 8, characterized in that: The patch type resistance strain sensor is fixed to the surface of the bearing device by a plurality of bolts.

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