CN213600198U - Screw type tension sensor - Google Patents

Abstract

The utility model relates to a screw force sensor, screw force sensor include sensor elastomer and induction circuit. The sensor elastic body comprises a body part, a connecting part formed by partially protruding from one end of the body part and a screw connected to the other end of the body part, and the extending direction of the connecting part and the extending direction of the screw deviate from each other. The connecting part comprises a connecting hole perpendicular to the axis of the screw rod, and the induction circuit is mounted on the body part. One end of the screw type tension sensor is connected to the equipment through a screw, and the other end of the screw type tension sensor is connected with the chain through a connecting part, so that a tension sensor structure is realized, and the installation convenience and the detection accuracy can be improved. The body part can participate in the stretching stress of the chain, so that the induction part of the sensor is less interfered, the sensitivity is high, and the accuracy of the detection data is high.

Description

Screw type tension sensor

Technical Field

The utility model relates to a technical field of weigh, concretely relates to screw force sensor.

Background

Lifting type logistics equipment such as electric forklifts, diesel forklifts, fork trucks and the like are widely applied to carrying, stacking and the like of materials in the field of logistics storage. The lifting type logistics equipment comprises an equipment main body, a portal arranged on the equipment main body, a fork frame connected to the portal in a sliding mode, and a chain connected with the fork frame and the portal, wherein the chain drives the fork frame to move up and down along the portal so as to realize lifting movement of materials. The material need be measured through weighing equipment such as weighbridge before the transport, and the transport is removed to over-and-under type logistics equipment, and measurement inefficiency just uses inconveniently.

In the related art, a screw is installed at one end of a chain, penetrates through a gantry, is connected with a pressure sensor, and measures the weight of an object carried by a fork carriage through the pressure sensor. However, the pressure sensor is affected by the fit clearance and the connection structure of the door frame, the screw rod and the like in the measuring process, the weighing accuracy is low, and the measuring error is large, so that improvement is needed.

Disclosure of Invention

An object of the utility model is to provide a screw force transducer.

To achieve the purpose, the utility model adopts the following technical proposal:

the screw type tension sensor comprises a sensor elastic body and an induction circuit, wherein the sensor elastic body comprises a body part, a connecting part and a screw rod, the connecting part is formed by partially protruding one end of the body part, the screw rod is connected to the other end of the body part, the extending direction of the connecting part and the extending direction of the screw rod are mutually deviated, the connecting part comprises a connecting hole perpendicular to the axis of the screw rod, and the induction circuit is installed on the body part.

In one embodiment, the screw is integrally formed with the body portion; or, the screw rod is spirally connected with the body part.

In one embodiment, the screw includes a rod body, a connecting thread provided on an outer peripheral wall of the rod body, and a locking portion provided on the rod body, the rod body is connected to the body portion, the connecting thread extends from one end of the rod body to the other end, and the locking portion is away from the body portion.

In one embodiment, the locking portion includes a latch hole penetrating the rod body.

In an embodiment, a length ratio of the length of the screw to the length of the body portion in a first direction is a, wherein a is greater than or equal to 1 and less than or equal to 4, the first direction is an axial direction of the screw, and the length of the screw is the maximum length of the screw protruding out of the body portion.

In one embodiment, the connection part includes a plate-shaped main connection plate through which the connection hole penetrates.

In an embodiment, the connecting portion further comprises at least one side connecting plate parallel to the main connecting plate, and a mounting groove is formed between the side connecting plate and the main connecting plate.

In an embodiment, the body portion includes a first end wall, a second end wall, a first connecting surface and a second connecting surface, the first connecting surface and the second connecting surface connect the first end wall and the second end wall, the connecting portion partially protrudes from a surface of the first end wall, the screw protrudes relative to the second end wall, the body portion further includes strain grooves distributed at intervals on the first connecting surface and the second connecting surface, and the screw is located outside a projection area of the strain groove on the second end wall.

In an embodiment, the strain groove includes a first strain groove, a second strain groove, a third strain groove and a fourth strain groove, the first strain groove and the third strain groove are disposed at an interval on the first connection surface, the second strain groove and the fourth strain groove are disposed at an interval on the second connection surface, the first strain groove and the second strain groove are disposed opposite to each other and extend toward each other from the surface of the body portion, and the third strain groove and the fourth strain groove are disposed opposite to each other and extend toward each other from the surface of the body portion.

In an embodiment, the strain groove includes a first groove wall and a second groove wall opposite to the first groove wall at a distance, and at least a portion of the first groove wall is bent and forms a hooking engagement with the second groove wall.

The utility model has the advantages that: one end of the screw type tension sensor is connected to the equipment through a screw, and the other end of the screw type tension sensor is connected with the chain through a connecting part, so that a tension sensor structure is realized, and the installation convenience and the detection accuracy can be improved. The body part can participate in the stretching stress of the chain, so that the induction part of the sensor is less interfered, the sensitivity is high, and the accuracy of the detection data is high.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic perspective view of a sensor with a main connecting plate according to the present invention.

Fig. 2 is a schematic view of the sectional structure of the middle sensor connecting chain and the connecting beam.

Fig. 3 is a schematic front view of the sensor with the main connection board according to the present invention.

Fig. 4 is a schematic side view of a sensor with a main connecting plate according to the present invention.

Fig. 5 is a schematic perspective view of a sensor with a side connection plate according to the present invention.

Fig. 6 is a schematic perspective view of another sensor with a side connection plate according to the present invention.

Fig. 7 is a schematic perspective view of a sensor with a limiting structure according to the present invention.

In the figure: a body portion 10; a strain tank 11; a first strain groove 111; a second strain tank 112; a third strain tank 113; a fourth strain tank 114; first slot wall 115; a second slot wall 116; a slot bottom hole 117; a guide groove 118; a guide rail boss 119; a first end wall 12; a second end wall 13; a first connection face 14; a second connection face 15; a first detection tank 16; a first plane 17; a connecting portion 20; a connecting hole 21; a main connection plate 22; the side connecting plates 23; a screw 30; a rod body 31; the connecting screw thread 32; a lock portion 33; a latch hole 331; a sensing circuit 40; a chain 50; a link plate 51; a connecting shaft 52; a locking member 60; the beam 70 is connected.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being either a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 and 2, the utility model discloses a screw type tension sensor for detecting the received tension. The screw type tension sensor comprises a sensor elastic body and a sensing circuit 40, wherein the sensor elastic body is used for connecting a first object and a second object through structural members such as chains. When the first object moves relative to the second object, the elastic body of the sensor is deformed by tensile force, the deformation amount of the elastic body of the sensor is detected by the sensing circuit 40 to obtain a corresponding electric signal, and then a corresponding tensile force value is obtained through the built-in program operation of the weighing instrument.

In one embodiment, the sensor elastic body includes a body 10, a connection portion 20 partially protruding from one end of the body 10, and a screw 30 connected to the other end of the body 10. The extending direction of the connecting portion 20 and the extending direction of the screw 30 are opposite to each other, the connecting portion 20 includes a connecting hole 21 perpendicular to the axis of the screw 30, and the sensing circuit 40 is mounted on the body portion 10.

The connection parts 20 and the screws 30 are respectively located at both ends of the body part 10 to constitute the connection parts 20 of the first and second objects. When the screw type tension sensor is applied to the elevation type logistics apparatus, the first object may be configured as a chain 50 and the second object may be configured as a gantry or a fork carriage. Wherein the coupling portion 20 is coupled to the chain 50 and the screw 30 is coupled to the mast or the fork carriage. Alternatively, the chain 50 includes spaced link plates 51 and connecting shafts 52 connecting the link plates 51, the link plates 51 are clamped or inserted into the connecting portion 20, and the connecting shafts 52 pass through the connecting holes 21 and are locked to the link plates 51 to connect the connecting portion 20 with the chain 50. The sensor is connected to the chain 50 through the connecting part 20, and an adapter matched with the chain 50 does not need to be additionally arranged, so that the sensor is convenient to connect and good in integration.

The mast and the fork carriage are each provided with a horizontal connecting beam 70 for connecting the chains 50, the two chains 50 being distributed at intervals and connected to the connecting beam 70. Optionally, the connecting beam 70 is provided with a mounting hole therethrough, the diameter of the mounting hole being larger than the outer diameter of the threaded rod 30. The screw 30 is lockingly connected to the connecting beam 70 by the locking member 60 so that the sensor is mounted to the connecting beam 70, wherein the locking member 60 may be provided as a nut or other mating member. One end of the screw type tension sensor is connected to the connecting beam 70 through the screw 30, and the other end is connected with the chain 50 through the connecting part 20, so that the tension sensor structure is realized, and the installation convenience and the detection accuracy can be improved. The body part 10 can participate in the stretching stress of the chain 50, so that the sensing part of the sensor is less interfered, the sensitivity is high, and the accuracy of the detection data is high.

In an embodiment, the screw 30 and the body 10 are integrally formed, and the connecting portion 20, the body 10 and the screw 30 are formed by processing the same bar, so that the overall mechanical performance is good, the structural strength is high, and the detection accuracy of the sensor is high. In another embodiment, the screw 30 is screwed to the body 10. In the present embodiment, the connecting portion 20 is integrally formed with the main body portion 10, and therefore, the required processing material is small and the processing cost is low. The screw 30 is independently processed, a threaded hole is processed on the body part 10, and the screw 30 is in threaded connection with the body part 10, so that the screw 30 is combined with the body part 10, and the assembly is convenient.

In the above embodiment, the screw 30 includes a rod 31 and a connecting thread 32 disposed on the outer peripheral wall of the rod 31, the connecting thread 32 extends from one end of the rod 31 to the other end, and the rod 31 is connected to the body 10. When the screw 30 is integrally formed with the body 10, the rod 31 is connected to the body 10, and the intersection of the rod 31 and the body 10 is connected by an arc transition to avoid stress concentration. The connecting thread 32 is distributed on the outer circumferential wall of the rod body 31 and extends to the free end of the rod body 31, so that the movable connection range of the nut is enlarged. Optionally, the screw 30 further includes a locking portion 33 disposed on the rod body 31, and the locking portion 33 is far from the body portion 10, so that a space for the nut to be locked to the connecting beam 70 is provided between the locking portion 33 and the body portion 10. Wherein the locking portion 33 is close to the free end of the screw 30 to prevent the nut from being disengaged from the screw 30. Optionally, the locking part 33 includes a latch hole 331 penetrating the lever body 31, and the latch hole 331 is distant from the body part 10. The pin hole 331 is used to install a pin, a cotter pin, or the like to prevent the nut member from being separated from the screw bar 30. The reliability of the connection of the sensor with the connection beam 70 is improved. Of course, the locking portion 33 may also be configured as an annular groove, an open groove, or the like, for mounting a snap spring or a locking structure member having a snap rib.

The screw 30 protrudes from the body portion 10 for mounting the sensor to the connection beam 70. Wherein, the screw 30 is installed with two or more nuts, one of which is close to the body 10 and abuts against the upper surface of the connecting beam 70 to limit the depth dimension of the screw 30 installed to the connecting beam 70. The other nuts are assembled from the free end of the screw 30 and locked to the lower surface of the connection beam 70 to hold the installation angle and position of the locking sensor, and the installation is convenient. In one embodiment, a length ratio of the length of the screw 30 to the length of the body 10 in the first direction is a, where a is greater than or equal to 1 and less than or equal to 4, the first direction is an axial direction of the screw 30, and the length of the screw 30 is a maximum length of the screw 30 protruding out of the body 10. The length of the screw 30 is proportional to the length of the body portion 10 to accommodate the sensor mounting requirements of different ranges. The length ratio a can be set to equal ratio values of 1, 1.5, 2, 2.5, 3, 4, so as to meet the installation requirements of different sizes of the connecting beam 70 and the range requirements of the length device.

As shown in fig. 3, 4 and 5, the connecting portion 20 is used to connect the chain 50 and adapts the installation size of the link plate 51. The connecting portion 20 includes a plate-shaped main connecting plate 22, and the connecting hole 21 penetrates through the main connecting plate 22. The main connecting plate 22 has a plate structure, so that the connecting portion 20 can be inserted into the space between the two link plates 51, so that the connecting hole 21 is coaxial with the shaft hole of the link plate 51, and the connecting shaft 52 passes through the shaft hole and the connecting hole 21, so that the connecting portion 20 and the chain 50 are connected into a whole, and the connection is convenient. The link plate 51 can rotate relative to the main link plate 22 to keep the direction of the tension experienced by the sensor controllable. In an alternative embodiment, the main connecting plate 22 is a plate-shaped projection protruding from the middle of the body 10, so that the body 10 is stressed evenly and tested accurately. Optionally, the axis of the screw 30 is located on the symmetrical center plane of the body 10, and the main connecting plate 22 is symmetrically arranged relative to the axis of the screw 30, so that the screw 30, the connecting portion 20 and the body 10 are in a central symmetrical structure, and the accuracy of sensor detection is improved. Optionally, the free end of the main connecting plate 22 is provided with a chamfer, which may be configured as a circular arc chamfer or an oblique angle to improve the rotational flexibility of the connecting portion 20 and avoid interference.

As shown in fig. 1, 5 and 6, the connecting portion 20 further includes at least one side connecting plate 23 parallel to the main connecting plate 22, and a mounting groove is formed between the side connecting plate 23 and the main connecting plate 22. The side link plates 23 are spaced apart from the main link plate 22, the link plates 51 are inserted into the mounting grooves such that both sides of the link plates 51 are restricted by the connecting portions 20, and the connecting shaft 52 passes through the side link plates 23, the link plates 51 and the main link plate 22 to connect the connecting portions 20 with the chain 50, which is high in connection strength. Optionally, two side connection plates 23 are provided, and the two side connection plates 23 are symmetrically arranged relative to the main connection plate 22 to improve the force stability of the connection structure.

In another embodiment, the main connecting plate 22 and the side connecting plate 23 are spaced apart and symmetrically arranged with respect to the symmetry center plane of the connecting portion 20. The main connecting plate 22 and the side connecting plate 23 replace one link of the chain plate 51 to be connected to the chain 50, so that the uniformity of the connection of the chain 50 and the sensor is improved, and the assembly is convenient.

The body portion 10 is provided in a columnar structure for mounting the sensing circuit 40 to detect an amount of elastic deformation of the sensor, and then to output a voltage change formed by the amount of elastic deformation. The main body 10 includes a first detection groove 16 and a second detection groove formed by being recessed from the surface, the first detection groove 16 and the second detection groove are oppositely disposed, the sensing circuit 40 includes a first strain gauge and a second strain gauge, the first strain gauge is attached to the bottom of the first detection groove 16, and the second strain gauge is attached to the bottom of the second detection groove. The first detection groove 16 and the second detection groove are arranged back to back, and the projections of the first detection groove 16 on the surface where the second detection groove is located are overlapped, so that the first strain gauge and the second strain gauge can flexibly detect the elastic deformation amount of the elastic body of the sensor. Alternatively, the first and second detection grooves 16 and 16 are configured as circular grooves.

As shown in fig. 3 and 7, the body portion 10 includes a first end wall 12, a second end wall 13, and a first connecting surface 14 and a second connecting surface 15 connecting the first end wall 12 and the second end wall 13, the connecting portion 20 partially protrudes from a surface of the first end wall 12, and the screw 30 protrudes relative to the second end wall 13. The main body 10 has a columnar structure, and the first end wall 12 and the second end wall 13 constitute both ends of the main body 10 in the longitudinal direction. Optionally, the first end wall 12 is parallel to the second end wall 13. The first connecting surface 14 and the second connecting surface 15 are disposed opposite to each other to form a side wall of the body portion 10, a first plane 17 is formed between the first connecting surface 14, the second connecting surface 15, the first end wall 12 and the second end wall 13, the first detecting groove 16 is formed to be recessed from the first plane 17, and correspondingly, a second plane is formed between the first connecting surface 14, the second connecting surface 15, the first end wall 12 and the second end wall 13, and the second detecting groove is formed to be recessed from the second plane. One of the first connection surface 14 or the second connection surface 15 is provided with a wiring nut for leading out a signal line of the sensing circuit 40. Optionally, the plate surface of the main connecting plate 22 is perpendicular to the first connecting surface 14.

The main body 10 further includes strain grooves 11 spaced apart from the first connecting surface 14 and the second connecting wall 15, and the strain grooves 11 are disposed in the main body 10 to improve the sensitivity of the sensing circuit 40 in detecting the deformation of the elastic body. The screw 30 is located outside the projected area of the strain groove 11 on the second end wall 13 to improve the connection strength of the screw 30. The strain grooves 11 are distributed on two sides of the first detecting groove 16, and the strain grooves 11 extend from the first connecting surface 14 and the second connecting wall 15 to the symmetrical center plane of the main body 10. Alternatively, the strain gauge 11 is disposed in two lines, one of which extends from the first connecting surface 14 toward the direction of the center plane of symmetry of the body portion 10, and the other of which extends from the second connecting wall 15 toward the direction of the center plane of symmetry of the body portion 10.

Optionally, the strain grooves 11 are configured in four, where the strain grooves 11 include a first strain groove 111, a second strain groove 112, a third strain groove 113, and a fourth strain groove 114, the first strain groove 111 and the third strain groove 113 are disposed at the first connection surface 14 at intervals, and the second strain groove 112 and the fourth strain groove 114 are disposed at the second connection surface 15 at intervals. The first strain groove 111 and the second strain groove 112 are disposed opposite to each other and extend from the surface of the main body 10 to be close to each other, and the third strain groove 113 and the fourth strain groove 114 are disposed opposite to each other and extend from the surface of the main body 10 to be close to each other.

The first strain groove 111, the second strain groove 112, the third strain groove 113, and the fourth strain groove 114 are distributed two by two symmetrically with respect to the center plane of symmetry of the body portion 10, and the axis of the first detection groove 16 is located in the area of the quadrangle formed by the first strain groove 111, the second strain groove 112, the third strain groove 113, and the fourth strain groove 114. Wherein, the symmetry center plane of the body portion 10 is a plane where the axis of the screw 30 intersects with the axis of the first detection groove 16.

The cross-sectional shapes of the strain grooves 11 in the same body portion 10 are the same or symmetrical, wherein the symmetry includes rotational symmetry and plane symmetry, so as to keep the stress strain of the body portion 10 uniform. The strain groove 11 includes a first groove wall 115 and a second groove wall 116 spaced from the first groove wall 115, and the groove distances between the first groove wall 115 and the second groove wall 116 are uniform. Optionally, the strain tank 11 further comprises a tank bottom hole 117, the aperture of the tank bottom hole 117 being larger than the tank spacing between the first tank wall 115 and the second tank wall 116. First slot wall 115 and second slot wall 116 intersect to slot bottom hole 117 to avoid stress concentration of strain slot 11.

In one embodiment, at least a portion of the first slot wall 115 is bent and forms a hooking engagement with the second slot wall 116. The first groove wall 115 and the second groove wall 116 are partially bent to form an arc-shaped matched barb structure or a guide rail and guide groove matched structure, so that the sensor is prevented from being broken at the connecting part of the first strain groove 111 and the second strain groove 112 after being overloaded, or is prevented from being broken at the connecting part of the third strain groove 113 and the fourth strain groove 114 after being overloaded, and the use safety of the sensor is improved.

In an alternative embodiment, the first channel wall 115 partially protrudes and bends to form a first barb, and the second channel wall 116 partially protrudes and bends to form a second barb, the first barb and the second barb forming a mating structure that hooks onto each other and the first barb and the second barb being spaced apart by a channel spacing. In another alternative embodiment, the first groove wall 115 is partially recessed and bent to form a guide groove 118, the second groove wall 116 is partially raised and bent to form a guide rail protrusion 119 similar to a "T" shape, the guide rail protrusion 119 and the guide groove 118 form a mutually hooked matching structure, and the guide rail protrusion 119 and the guide groove 118 are spaced by a groove distance.

It should be understood that the above-described embodiments are merely illustrative of the preferred embodiments of the present invention and the technical principles thereof. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, these modifications are within the scope of the present invention as long as they do not depart from the spirit of the present invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.

Claims (10)

1. The screw type tension sensor comprises a sensor elastic body and an induction circuit, and is characterized in that the sensor elastic body comprises a body part, a connecting part and a screw rod, wherein the connecting part is formed by partially protruding one end of the body part, the screw rod is connected to the other end of the body part, the extending direction of the connecting part and the extending direction of the screw rod are deviated from each other, the connecting part comprises a connecting hole perpendicular to the axis of the screw rod, and the induction circuit is installed on the body part.

2. The screw-type tension sensor of claim 1, wherein the screw is integrally formed with the body portion; or, the screw rod is spirally connected with the body part.

3. The screw-type tension sensor of claim 2, wherein the screw comprises a rod body connected to the body portion, a connecting thread provided on an outer peripheral wall of the rod body, the connecting thread extending from one end of the rod body toward the other end, and a locking portion provided on the rod body, the locking portion being remote from the body portion.

4. The screw-type tension sensor of claim 3, wherein the lock comprises a latch hole through the rod body.

5. The screw-type tension sensor of claim 2, wherein the ratio of the length of the screw to the length of the body portion in the first direction is A, wherein A is 1-4, the first direction is the axial direction of the screw, and the length of the screw is the maximum length of the screw protruding out of the body portion.

6. The screw-type tension sensor of claim 1, wherein the connecting portion comprises a plate-shaped main connecting plate through which the connecting hole extends.

7. The screw tension sensor of claim 6, wherein the connection section further comprises at least one side connection plate parallel to the main connection plate, the side connection plate and the main connection plate forming a mounting slot therebetween.

8. The screw-type tension sensor of claim 1, wherein the body portion comprises a first end wall, a second end wall, and a first connecting surface and a second connecting surface connecting the first end wall and the second end wall, the connecting portion partially protrudes from a surface of the first end wall, the screw protrudes relative to the second end wall, the body portion further comprises strain grooves spaced apart from the first connecting surface and the second connecting surface, and the screw is located outside a projection area of the strain grooves on the second end wall.

9. The screw-type tension sensor of claim 8, wherein the strain groove comprises a first strain groove, a second strain groove, a third strain groove and a fourth strain groove, the first strain groove and the third strain groove are arranged at the first connecting surface at intervals, the second strain groove and the fourth strain groove are arranged at the second connecting surface at intervals, the first strain groove and the second strain groove are arranged correspondingly and extend from the surface of the body part to be close to each other, and the third strain groove and the fourth strain groove are arranged correspondingly and extend from the surface of the body part to be close to each other.

10. The screw-type tension sensor of claim 9, wherein the strain groove comprises a first groove wall and a second groove wall spaced opposite the first groove wall, at least a portion of the first groove wall being bent and in hooking engagement with the second groove wall.

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