Device for measuring accumulated displacement of expansion joint

Abstract

The invention provides an expansion joint accumulated displacement measuring device, and relates to the field of expansion joint measurement. A transmission chain; a containing groove is formed in the side face of the moving chain wheel in an inwards-sunken mode, and driving teeth are arranged on the groove side wall of the containing groove in the circumferential direction. The rotating wheel is arranged in the containing groove and coaxial with the moving chain wheel, the rotating wheel comprises a wheel body, a swing shifting block and a columnar protrusion, and the swing shifting block is connected to the wheel body through a pivotal shaft parallel to the axial direction of the wheel body and can swing towards the axis of the wheel body; a coaxial columnar protrusion extending outwards is arranged on the side face, away from the containing groove, of the wheel body, and transmission wheel teeth are arranged on the circumferential face of the protrusion. The connecting shaft transversely penetrates through the bulge, the wheel body and the moving chain wheel in sequence; the mechanical counter is fixedly arranged on the connecting shaft and is used for recording the accumulated number of turns of rotation of the moving chain wheel in the set direction; and a fixing rod. According to the measuring device provided by the invention, the accumulated displacement data of the expansion joint can be measured through a pure mechanical structure, the structure is simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of expansion joint measurement, in particular to an expansion joint cumulative displacement measurement device. BACKGROUND

[0002] The expansion joint is a structural gap reserved in the building, structure and facility of the engineering structure of the house, bridge, railway, highway, water conservancy, marine, port, underground and other projects to adapt to the expansion deformation of the material due to temperature change, humidity fluctuation, foundation settlement, vibration and other factors. Its role is to avoid cracking and damage of the structure due to deformation stress concentration, and to ensure the safety and durability of the structure.

[0003] The expansion joint is usually arranged at the segmented part of the engineering structure (such as wall, floor, bridge, pipeline, etc.), and the gap width is determined according to the structure type, material characteristics, environmental conditions, etc. For example, the expansion joint width of the building wall is usually 20-30mm, and the expansion joint width of the bridge can reach several centimeters according to the span.

[0004] The cumulative displacement refers to the total displacement value accumulated by time of the displacement of the engineering structure in the long-term use process due to various factors (such as load cycle, temperature change, foundation settlement, material creep, etc.). It reflects the long-term change trend of the structure displacement, rather than the displacement caused by instantaneous or single action.

[0005] In complex engineering structures such as bridges, the expansion joint will produce a small displacement due to factors such as alternating temperature changes and repeated vehicle loads, and its service life is usually directly related to the cumulative displacement. However, accurately identifying and recording such cumulative displacement is a big problem in engineering practice. The existing measurement device relies on electronic equipment, which not only has high cost, but also has obvious defects in stability and reliability. In the harsh environment of power failure, high temperature, high humidity, and continuous vibration commonly seen in bridge operation, electronic equipment is prone to failure or damage, and is more likely to cause the loss of stored cumulative displacement data, making it difficult to achieve long-term stable measurement and reliable storage of the cumulative displacement of the expansion joint throughout its life cycle, and seriously affecting the accurate assessment of the service life of the expansion joint.

[0006] Therefore, there is a need for an expansion joint cumulative displacement measurement device to at least partially solve the above technical problems. SUMMARY

[0007] The embodiment of the present application provides an expansion joint cumulative displacement measurement device, which measures the cumulative displacement data of the expansion joint through a pure mechanical structure, and has the advantages of simple structure and low cost.

[0008] The present application provides an expansion joint cumulative displacement measurement device, and the first end part and the second end part of the measurement target form the expansion joint, characterized in that the measurement device comprises: a horizontal base connected to the first end; a horizontal tensioned transmission chain arranged to the base; a motion sprocket engaged to the transmission chain; the side of the motion sprocket is inwardly recessed to arrange a receiving groove, the groove side wall of the receiving groove is circumferentially arranged to arrange driving teeth in the same inclined direction; a rotating wheel arranged in the receiving groove and coaxial with the motion sprocket, the rotating wheel comprises a wheel body, a swing block and a cylindrical protrusion, the swing block is connected to the wheel body via an axial parallel pivot shaft and can swing towards the shaft center of the wheel body; the wheel body is arranged with an outwardly extending coaxial cylindrical protrusion away from the side of the receiving groove, the peripheral surface of the protrusion is arranged with a transmission gear; a connecting shaft, the connecting shaft is transversely sequentially arranged through the protrusion, the wheel body and the motion sprocket; a mechanical counter fixedly arranged to the connecting shaft for recording the cumulative number of rotations of the motion sprocket in the set direction; the mechanical counter comprises a transmission gear set engaged to the transmission gear for counting; and a fixed rod, one end of the fixed rod is connected to the second end and the other end is fixedly connected to the connecting shaft; When the motion sprocket rotates in the set direction, the swing block is clamped in the tooth groove of the driving teeth to drive the wheel body and the protrusion to rotate synchronously; when the motion sprocket rotates in the opposite direction of the set direction, the swing block slides over the tooth back of the driving teeth and swings towards the shaft center of the rotating wheel, so that the wheel body and the protrusion do not rotate.

[0009] According to the measuring device of the present application, when the expansion joint of the measurement target changes in displacement, for example, the expansion joint narrows (the overall trend of the expansion joint is also narrowing) so that the base approaches the second end, synchronously driving the transmission chain to move, so that the motion sprocket rotates on the transmission chain in the set direction, at this time, due to the swing block clamped in the tooth groove of the driving teeth, the wheel body and the protrusion are synchronously driven to rotate under the drive of the motion sprocket, the protrusion synchronously drives the transmission gear set of the mechanical counter to rotate through the transmission gear, records the cumulative number of rotations (angle) of the motion sprocket in the set direction, and obtains the cumulative displacement of the expansion joint based on the relationship between the displacement change of the expansion joint and the cumulative angle of the rotation of the motion sprocket; when the expansion joint widens in a certain period of time, the base moves away from the second end, synchronously driving the transmission chain to move, so that the motion sprocket rotates on the transmission chain in the opposite direction of the set direction, at this time, the swing block slides over the tooth back of the driving teeth and swings towards the shaft center of the rotating wheel, so that the wheel body and the protrusion do not rotate with the motion sprocket, thereby realizing one-way displacement counting of the expansion joint.

[0010] It should be noted that the mechanical counter in the present application is a prior art device, mainly including a transmission gear set for counting, and the counting logic of the mechanical counter is designed based on gear transmission and carry. The general principle is that the transmission gear set includes multiple gears, and each gear is marked with a number. When the low-level gear rotates to the maximum value and continues to rotate, it will trigger the carry, that is, the current low-level gear is reset to zero, and the adjacent high-level gear is incremented by one, and so on to realize multi-bit counting. When the protruding transmission gear teeth drive the lowest gear (or the first gear) of the mechanical counter to rotate synchronously along with the rotation of the movement sprocket in the set direction, the number on the lowest gear of the mechanical counter is accumulated with the rotation. When the number on the lowest gear reaches the maximum value, the adjacent high gear will trigger the carry to realize multi-level accumulation. Through the design of the transmission gear set of the mechanical counter, the cumulative number of rotations (angle) of the movement sprocket in the set direction can be recorded.

[0011] Optionally, the measuring device further comprises a chain mounting mechanism for mounting the transmission chain, and the chain mounting mechanism is arranged to the base.

[0012] Optionally, the chain mounting mechanism comprises: two mounting seats arranged at intervals on the top surface of the base; fastening connectors, and two ends of the transmission chain are connected to the mounting seats via the fastening connectors.

[0013] Optionally, the fastening connector comprises a connecting bolt, and the connecting bolt is horizontally connected to the mounting seat via an adjusting nut. Optionally, the swing block is arranged to the inner side surface of the wheel body close to the accommodating groove.

[0014] Optionally, the movement sprocket is vertically arranged above the transmission chain.

[0015] Optionally, the wheel body and the protrusion are of an integrated structure.

[0016] Optionally, initially, the swing block is clamped in the tooth groove of the driving tooth.

[0017] Optionally, the fixed rod is a U-shaped fixed rod, and one end of the bifurcated fixed rod is fixedly connected to the end of the connecting shaft away from the movement sprocket.

[0018] Optionally, the fixed rod and the mechanical counter are located on the same side of the movement sprocket.

[0019] The additional advantages, objects, and features of the application will be set forth in part in the description which follows, and will in part be apparent to those of ordinary skill in the art upon examination of the following or can be learned from practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the specification as well as in the appended claims.

[0020] Those skilled in the art will understand that the objects and advantages of the invention can be implemented without the above specifically recited details, and that the method can be implemented with or without the specific details of the invention. Furthermore, the described embodiments of the invention are to be considered in all respects as illustrative and not restrictive. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, explain the principles of the invention. In the drawings: Figure 1 A schematic diagram of the distribution of the measuring device according to an embodiment of the present invention at a expansion joint; Figure 2 A schematic diagram of the distribution of the measuring device according to an embodiment of the present invention at a expansion joint; Figure 1 A schematic diagram of the distribution of the measuring device according to an embodiment of the present invention at a expansion joint; Figure 3 A schematic diagram of the distribution of the measuring device according to an embodiment of the present invention at a expansion joint; Figure 4 A schematic diagram of the distribution of the measuring device according to an embodiment of the present invention at a expansion joint;

[0022] BRIEF DESCRIPTION OF DRAWINGS 100, measuring device; 110, base; 111, mounting seat; 112, connecting bolt; 113, adjusting nut; 120, transmission chain; 130, movement sprocket; 131, accommodating groove; 132, driving teeth; 140, rotating wheel; 141, wheel body; 142, swing block; 143, protrusion; 144, pivot shaft; 150, connecting shaft; 160, mechanical counter; 170, fixed rod; 200, expansion joint; 210, first end; 220, second end. DETAILED DESCRIPTION

[0023] The objects and advantages of the present invention will be realized and attained by means of the instrumentalities and combinations particularly pointed out in the written description and claims hereof as follows. However, the present invention should not be construed as being limited by the illustrative embodiments disclosed herein; the method can be implemented in various forms. The essence of the specification is merely to help those skilled in the relevant art to comprehensively understand the specific details of the present invention.

[0024] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0025] Numerical ordinals such as "first" and "second" as used herein are merely identifiers and do not imply a specific order or sequence unless otherwise specifically indicated. Moreover, use of terms such as "first" and "second", etc. do not imply the existence of a limitation that there be two or more of something unless expressly so defined. Also, use of such terms herein is merely to facilitate discussion and does not imply a specific order unless otherwise specifically indicated.

[0026] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and similar terms are used only to illustrate the present application and not to limit it.

[0027] The present application provides a kind of expansion joint cumulative displacement measuring device 100.Therein measuring device 100 It can be applied to expansion joint measurement field, such as for bridge, railway, highway, hydraulic engineering, marine engineering, port, underground engineering Building, structure and facility in engineering structure in it, such as expansion joint cumulative displacement measurement of engineering structure in the section of engineering structure, such as wall, floor, bridge, pipeline etc., can solve the problems such as weak environmental adaptability, high cost of existing measuring device.

[0028] Wherein, expansion joint is formed between the first end and the second end of the measurement target.The measurement target can be a building, structure and facility in engineering structure of bridge, railway, highway, hydraulic engineering, marine engineering, port, underground engineering, such as the section of engineering structure, such as wall, floor, bridge, pipeline etc. Figure 1 And Figure 2 As shown in the orientation, the first end is located on the right side, and the second end is located on the left side. For ease of description, the first end is located on the right side and the second end is located on the left side in the subsequent related description.

[0029] To solve at least one of the above problems, the present application provides an expansion joint cumulative displacement measuring device 100. In a preferred embodiment, as shown in Figure 1 , Figure 2 , Figure 3 And Figure 4 As shown in Figure 1 is a distribution diagram of the measuring device according to an embodiment of the present application in expansion joint; Figure 2 is Figure 1A side view of the structure shown; Figure 3 A schematic view of a measuring device according to an embodiment of the present application; Figure 4 A schematic view of a part of the measuring device according to an embodiment of the present application; wherein the swing block is transparentized. The measuring device 100 can include a base 110, a transmission chain 120, a motion sprocket 130, a rotating wheel 140, a connecting shaft 150, a mechanical counter 160 and a fixing rod 170.

[0030] Specifically, the right end of the horizontal base 110 is connected to the first end portion 210. The other end (left end) of the base 110 is suspended and has no connection relationship with other structures. The base 110 can be a hard flat plate-shaped base 110. The base 110 can serve to support the measuring device 100 and provide a stable mounting basis for other components.

[0031] The horizontally tensioned transmission chain 120 is arranged on the base 110. The transmission chain 120 can transmit the displacement change of the expansion joint 200.

[0032] The motion sprocket 130 is engagedly connected to the transmission chain 120. The motion sprocket 130 can be vertically arranged above the transmission chain 120. The side of the motion sprocket 130 is inwardly recessed to form a receiving groove 131. The receiving groove 131 can be a circular groove. The groove side wall of the receiving groove 131 is circumferentially arranged with driving teeth 132 arranged in the same inclined direction.

[0033] The rotating wheel 140 is arranged in the receiving groove 131 and coaxially arranged with the motion sprocket 130. The rotating wheel 140 can include a wheel body 141, a swing block 142 and a columnar protrusion 143. The swing block 142 can be connected to the wheel body 141 via a pivot shaft 144 parallel to the axial direction of the wheel body 141 and can swing towards the axial center of the wheel body 141. Initially, the swing block 142 is clamped in the tooth groove of the driving teeth 132.

[0034] For example, the swing block 142 can be arranged on the side surface (outer side surface or inner side surface) of the wheel body 141, or on the peripheral surface of the wheel body 141. The side surface of the wheel body 141 away from the receiving groove 131 is provided with an outwardly extending columnar protrusion 143 coaxial with the wheel body 141. The peripheral surface of the protrusion 143 is provided with a transmission gear. In order to avoid interference between the swing block 142 and the mechanical counter 160, the protrusion 143, etc., the swing block 142 can be preferably arranged on the inner side surface of the wheel body 141, or on the peripheral surface of the wheel body 141. In addition, the protrusion 143 and the wheel body 141 can be an integral structure to improve the connection strength, or can be a split structure, for example, a detachable connection structure between the two.

[0035] The connecting shaft 150 passes through the protrusion 143, the wheel body 141 and the motion sprocket 130 in sequence in the transverse direction. The centers of the protrusion 143, the wheel body 141 and the motion sprocket 130 have perforations for the connecting shaft 150 to pass through. The connecting shaft 150 itself is not rotating, and the rotating wheel 140 and the motion sprocket 130 can rotate around the connecting shaft 150.

[0036] The mechanical counter 160 is fixedly arranged on the connecting shaft 150, for example, is sleeved on the connecting shaft 150, and is used for recording the cumulative number of rotations or the cumulative angle of the motion sprocket 130 rotating in a set direction. Generally, the mechanical counter 160 includes a transmission gear set engaged to a transmission gear for counting.

[0037] Through the mechanical counter 160 arranged, the slight displacement of the expansion joint 200 can be stably transmitted to the counting device, and the counting method is intuitive and simple, and the cumulative displacement value can be quickly obtained.

[0038] It should be noted that the mechanical counter 160 in the present application is a prior art device, which is a pure mechanical structure and mainly includes a transmission gear set for counting. The counting logic of the mechanical counter 160 is designed based on gear transmission and carry. The general principle is that the transmission gear set includes multiple gears, and each gear is marked with a number. When the low-level gear rotates to the maximum value and continues to rotate, the carry is triggered, that is, the current low-level gear is reset to zero, and the adjacent high-level gear is increased by one, and the multi-bit counting is realized in this way. When the motion sprocket 130 rotates in a set direction, the transmission gear of the protrusion 143 drives the lowest gear (or the first gear) of the mechanical counter 160 to rotate synchronously, and the number on the lowest gear of the mechanical counter 160 is accumulated with the rotation. When the number on the lowest gear reaches the maximum value, the adjacent high-level gear is triggered to carry, and multi-level accumulation is realized.

[0039] The left end of the fixed rod 170 is connected to the second end portion 220, and the right end is fixedly connected to the connecting shaft 150.

[0040] It can be understood that the fixed rod 170 and the mechanical counter 160 can be located on the same side of the motion sprocket 130, or can be located on the two sides of the motion sprocket 130. Preferably, the fixed rod 170 and the mechanical counter 160 can be located on the same side of the motion sprocket 130 to realize better stability of the entire measuring device 100.

[0041] Among them, the fixed rod 170 is arranged on the same side of the motion sprocket 130 as the mechanical counter 160. Figure 1 and Figure 2For example, when the motion sprocket 130 rotates in the clockwise direction, the swing block 142 can be engaged in the tooth groove of the driving tooth 132 to drive the wheel body 141 and the protrusion 143 to rotate synchronously. When the motion sprocket 130 rotates in the counterclockwise direction, the swing block 142 slides over the tooth back of the driving tooth 132 and swings to the axis of the rotating wheel 140, so that the wheel body 141 and the protrusion 143 do not rotate.

[0042] Based on the above technical solution, when the expansion joint 200 of the measurement target changes in displacement, for example, the expansion joint 200 narrows (the overall trend of the expansion joint 200 is also narrowing) so that the base 110 moves close to the second end 220, the transmission chain 120 is driven to move synchronously, so that the motion sprocket 130 rotates on the transmission chain 120 in the clockwise direction. At this time, the swing block 142 is engaged in the tooth groove of the driving tooth 132, and the wheel body 141 and the protrusion 143 are driven to rotate synchronously under the driving of the motion sprocket 130. The protrusion 143 drives the transmission gear set of the mechanical counter 160 to rotate synchronously through the transmission wheel tooth, records the cumulative number of rotations (angle) of the motion sprocket 130 in the set direction, and obtains the cumulative displacement of the expansion joint 200 based on the relationship between the displacement change of the expansion joint 200 and the cumulative angle of rotation of the motion sprocket 130.

[0043] It can be understood that, assuming that the expansion joint 200 widens (the overall trend of the expansion joint 200 is also widening) so that the base 110 moves away from the second end 220, the principle and process are the same as above, and will not be described here.

[0044] According to the measurement device 100 of the present application, the cumulative displacement data of the expansion joint 200 is measured by a pure mechanical structure, which is simple in structure and low in cost.

[0045] Reference Figure 3 and Figure 4 According to the measurement device 100 of the present application, the measurement device 100 can further include a chain mounting mechanism for mounting the transmission chain 120. The chain mounting mechanism is provided to the base 110.

[0046] Specifically, the chain mounting mechanism can include two mounting seats 111 arranged at intervals on the top surface of the base 110. The two ends of the transmission chain 120 can be connected to the mounting seats 111 through fastening connectors, respectively.

[0047] The fastening connector can include a connecting bolt 112. The connecting bolt 112 is horizontally connected to the mounting seat 111 via an adjusting nut 113 to adjust the tension of the transmission chain 120 to ensure a horizontal tension state.

[0048] With continued reference to Figure 3 , the fixed rod 170 can be a U-shaped fixed rod 170 to reduce weight. One end (right end) of the bifurcated fixed rod 170 is fixedly connected to one end of the connecting shaft 150 away from the movement sprocket 130.

[0049] In summary, the measuring device 100 according to the present application provides a low-cost, purely mechanical structure of the expansion joint 200 cumulative displacement measuring device 100, which realizes one-way effective displacement measurement of the expansion joint 200, can avoid the interference of reverse displacement on the cumulative value, so as to ensure the accuracy of the cumulative displacement record, solves the problems of poor stability and reliability, easy damage of the existing electronic measuring device 100 in the harsh environment of power failure, high temperature, high humidity, vibration and the like, can work stably for a long time in complex engineering environment, also solves the problem of easy loss of cumulative displacement data of the existing electronic measuring device 100 in harsh environment, realizes stable storage of the cumulative displacement data of the expansion joint 200 through a purely mechanical structure, and guarantees data integrity.

[0050] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed here. Specification and examples are, accordingly, to be regarded only as illustrative and not as restrictive.

Claims

1. A device for measuring the cumulative displacement of an expansion joint, wherein the expansion joint is formed between a first end and a second end of a measuring target, characterized in that, The measuring device includes: One end is connected to a horizontal base at the first end; A horizontally tensioned drive chain is installed to the base; A sprocket meshes with the transmission chain; the side of the sprocket is provided with an inwardly recessed receiving groove, and the sidewall of the receiving groove is provided with drive teeth arranged in the same inclined direction along the circumferential direction; A rotating wheel is disposed in a receiving groove and coaxial with the motion sprocket. The rotating wheel includes a wheel body, a swing block and a columnar protrusion. The swing block is connected to the wheel body via a pivot shaft parallel to the axis of the wheel body and can swing towards the axis of the wheel body. The wheel body has a coaxial columnar protrusion extending outward on the side away from the receiving groove, and the circumferential surface of the protrusion is provided with transmission teeth. A connecting shaft that passes laterally and sequentially through the protrusion, the wheel body, and the sprocket; A mechanical counter, fixedly mounted to a connecting shaft, is used to record the cumulative number of revolutions of the sprocket along a set direction; the mechanical counter includes a transmission gear set meshing with the transmission gear teeth for counting; and A fixing rod, one end of which is connected to a second end and the other end is fixedly connected to a connecting shaft; When the sprocket rotates in a set direction, the swing block is engaged in the tooth groove of the drive tooth to drive the wheel body and the protrusion to rotate synchronously; when the sprocket rotates in the opposite direction of the set direction, the swing block slides over the back of the drive tooth and swings towards the axis of the rotating wheel, so that the wheel body and the protrusion do not rotate.

2. The measuring device according to claim 1, characterized in that, It also includes a chain mounting mechanism for mounting the drive chain, the chain mounting mechanism being disposed on the base.

3. The measuring device according to claim 2, characterized in that, The chain mounting mechanism includes: Two mounting seats are spaced apart on the top surface of the base; Fastening connectors are used to connect both ends of the transmission chain to the mounting base.

4. The measuring device according to claim 3, characterized in that, The fastening connector includes a connecting bolt, which is horizontally connected to the mounting base via an adjusting nut.

5. The measuring device according to claim 1, characterized in that, The oscillating block is disposed on the inner side of the wheel body near the receiving groove.

6. The measuring device according to claim 1, characterized in that, The motion sprocket stands vertically above the transmission chain.

7. The measuring device according to claim 1, characterized in that, The wheel body and the protrusion are an integral structure.

8. The measuring device according to claim 1, characterized in that, Initially, the oscillating block is engaged in the groove of the drive tooth.

9. The measuring device according to claim 1, characterized in that, The fixing rod is a U-shaped fixing rod, and one forked end of the fixing rod is fixedly connected to the end of the connecting shaft away from the moving sprocket.

10. The measuring device according to claim 1, characterized in that, The fixed rod and the mechanical counter are located on the same side of the moving sprocket.

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