A device for measuring the diameter of circular bridge piers

Abstract

The present invention discloses a circular bridge pier diameter measuring device, which belongs to the field of bridge pier measurement technology. It includes a cart, wherein two movable cylinders are symmetrically provided on the upper end surface of the cart, a worm gear is fixedly sleeved on the outer side of the movable cylinder on the right side, a rocker is fixed on the end of the worm, and the protective box is sleeved on the outer side of the worm gear and the worm; it also includes: a screw threadedly passing through the movable cylinder on the right side, a fixed rod slidingly passing through the inside of the movable cylinder on the left side, a measuring mechanism is provided above the support seat, the measuring mechanism can be stored to reduce the occupied space, and a cleaning mechanism is provided on the inner side of the measuring mechanism. The circular bridge pier diameter measuring device can realize automatic measurement by fitting with the pier, which can improve the accuracy of the data, and the measuring device can be quickly folded when not in use to reduce the occupied area. At the same time, the mud and ash adhering to the device can be cleaned during the measurement process to avoid affecting the accuracy of the measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge pier measurement, in particular to a device for measuring the diameter of a circular bridge pier. Background Art

[0002] A pier is a lower load-bearing object used to support an upper structure. It is mainly used in the construction of roads, bridges, etc. Piers have rectangular, circular, and other special-shaped structures. During the construction process of a circular pier, its diameter needs to be measured, so that a foundation pit of the corresponding size can be dug more accurately for subsequent construction. For example, a circular pier diameter measuring tool with announcement number CN221198394U includes a circular pier measurement clamping assembly, on which a diameter measuring assembly is provided. The circular pier clamping plate in the circular pier measurement clamping assembly can be used to achieve a fitting clamping with the circular pier, making the diameter measurement of the circular pier simple and convenient. The screw is adjusted to position and control the first and second mounting seats, so that the circular pier clamping plate and the clamping positioning are convenient and stable, thereby achieving a good overall use effect when measuring the diameter of the circular pier. The rangefinder and rangefinder plate provided in the diameter measuring assembly can make the diameter measurement of the circular pier convenient.

[0003] For example, a portable bridge circular pier diameter measuring device with announcement number CN219200298U includes a main ruler and positioning rods arranged at both ends of the main ruler. The positioning rods are hinged on the main ruler and can be rotated relative to the main ruler for storage. The main ruler has an extension and contraction amount along its length, and the positioning rods have an extension and contraction amount in a direction perpendicular to the main ruler. The two positioning rods are used to clamp on the pier to be measured. The main ruler is provided with a level and an electronic measuring device. The electronic measuring device includes a displacement sensor and a control panel. When the level is in a horizontal state, the displacement sensor measures the extension and contraction amount of the main ruler to obtain the distance between the inner sides of the two positioning rods. The control panel is used to display the distance data. This device solves the limitations of existing detection and is applicable to various detection environments. However, the above diameter measuring device still has the following shortcomings during actual use:

[0004] 1. Traditionally, pier columns are measured manually using a handheld measuring ruler. This results in certain errors and requires repeated measurements, which increases construction time. Furthermore, the measuring equipment takes up a large amount of space and is inconvenient to fold and store.

[0005] 2. After the measuring equipment comes into contact with the pier, the mud on the pier will fall onto the measuring equipment. However, there is no structure to clean the mud during the measurement process, which affects the clarity when viewing the scale. It is usually cleaned manually after the measurement.

[0006] In response to the above problems, it is urgent to carry out innovative design based on the original diameter measuring equipment. Summary of the Invention

[0007] The purpose of the present invention is to provide a circular bridge pier diameter measuring device to solve the problems raised in the above background technology that the traditional measurement of piers has certain errors, the measuring equipment takes up a large space, is inconvenient to fold and store, and has no structure for cleaning the mud during the measurement process.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a circular bridge pier diameter measuring device, comprising: a cart, wherein the upper end surface of the cart is symmetrically provided with two movable cylinders, and the movable cylinder on the left is fixedly connected to the cart, and the movable cylinder on the right is rotatably connected to the cart, a worm gear is fixedly sleeved on the outer side of the movable cylinder on the right, and a worm is meshedly connected to the side of the worm gear, a rocker is fixed to the end of the worm gear, and the rocker rotates and penetrates the side of a protective box, the protective box is sleeved on the outside of the worm gear and the worm, and the protective box is fixedly connected to the cart;

[0009] It also includes: a screw rod, the thread of which passes through the movable cylinder on the right side, a fixed rod slidingly passing through the inside of the movable cylinder on the left side, and the top of the fixed rod and the screw rod are fixedly connected to the lower end surface of the support seat, a measuring mechanism is provided above the support seat, and the measuring mechanism can be used to measure the diameter of the pier column, the measuring mechanism can be stored to reduce the occupied space, and a cleaning mechanism is provided on the inner side of the measuring mechanism, and the cleaning mechanism is used to clean the mud and plaster adhering to the measuring mechanism.

[0010] Preferably, the measuring mechanism includes a fixed cylinder fixed above the support seat, and the middle of the fixed cylinder is disconnected, the disconnected portion is fixedly connected by a sleeve block, and a measuring ruler is fixed on the side of the sleeve block. The setting of the fixed cylinder and the sleeve block facilitates the movement and rotation of the measuring plate.

[0011] Preferably, connecting rulers are provided at both ends of the measuring ruler, and the connecting rulers form a rotating structure with the measuring ruler through a damping member, and the rotation range of the connecting rulers is 0-90°. The measuring ruler and the connecting ruler can be rotated to a horizontal state for measurement, and the connecting ruler can also be rotated 90° for storage.

[0012] Preferably, the measuring mechanism further includes measuring plates arranged at both ends of the fixed cylinder, and the measuring plates are connected to the fixed cylinder through a movable tube, and pointers are fixed at both ends of the fixed cylinder, and the end of the pointer away from the fixed cylinder is in contact with the surface of the measuring ruler, and the distance between the two pointers is equal to the distance between the two relatively distributed guide rollers. When the measuring plate moves, it can drive the support on the measuring ruler to move, making it convenient to observe the scale.

[0013] Preferably, a connecting plate is fixed to the end of the measuring plate away from the movable tube, and the connecting plate and the measuring plate are an integrated structure, and fixing grooves are provided inside the measuring plate and the connecting plate. At the same time, guide rollers are rotatably provided inside the fixing grooves, and the guide rollers are distributed at equal intervals. When the measuring plate and the connecting plate contact the pier, the guide rollers can be driven to rotate, thereby improving the smoothness of the contact process.

[0014] Preferably, the measuring plates and the connecting plates are symmetrically distributed about the vertical axis of the sleeve block, and the movement directions of the two measuring plates and the two connecting plates are opposite, and the two measuring plates are parallel to each other, and the two connecting plates are both inclined. The inclined structure of the connecting plates facilitates the movement of the two measuring plates to both sides of the pier.

[0015] Preferably, the cleaning mechanism includes a one-way air intake valve arranged on the sleeve block, and the air intake valve is arranged at both ends of the fixed cylinder, a piston plate is fixed to the end of the movable tube away from the measuring plate, and the piston plate is hollow inside, and fixed blocks are symmetrically arranged at the edge of the piston plate. During the movement of the piston plate, the gas in the sleeve block and the fixed cylinder can enter the cavity of the piston plate.

[0016] Preferably, a movable groove is provided in the fixed cylinder outside the fixed block, and the fixed block forms a sliding structure through the movable groove and the fixed cylinder, and the maximum distance between the two fixed blocks is equal to the inner diameter of the sleeve block. At the same time, the inner diameter of the sleeve block is larger than the inner diameter of the fixed cylinder. When the piston plate moves, it drives the fixed block to slide in the movable groove, thereby driving the measuring plate to move.

[0017] Preferably, a first unidirectional air inlet and a second air inlet are respectively provided on both sides of the piston plate, and the first air inlet is communicated with the interior of the sleeve block, and the second air inlet is communicated with the interior of the fixed cylinder, and the movable tube and the fixed cylinder are slidably connected, and the movable tube and the measuring plate are fixedly connected, and a spring for resetting the movable tube is fixedly wound around the outer side of the movable tube, and the end of the spring away from the movable tube is in contact with the fixed cylinder, and when the measuring plate moves, it drives the movable tube to slide on the fixed cylinder and compresses the spring.

[0018] Preferably, the movable tube and the gas transmission channel are interconnected, and the gas transmission channel is opened in the measuring plate and the connecting plate, and air outlet holes are reserved on the inner sides of the measuring plate and the connecting plate. The air outlet holes are arranged at equal intervals, and the air outlet holes and the guide rollers are distributed correspondingly. The rotation range of the measuring plate and the piston plate is 0-90°. The gas in the piston plate can be transmitted to the gas transmission channel through the movable tube and finally discharged from the air outlet holes.

[0019] Compared with the existing technology, the present invention has the following advantages: the circular bridge pier diameter measuring device can automatically measure by fitting with the pier, which can improve the accuracy of the data. The measuring device can be quickly folded when not in use to reduce the occupied area. At the same time, the mud and ash adhering to the device can be cleaned during the measurement process to avoid affecting the measurement accuracy. The specific contents are as follows:

[0020] 1. When the side of the pier column contacts the guide roller, it drives it to rotate, which improves the smoothness of the movement of the measuring plate and the connecting plate. When the pier column is located between the two measuring plates, the two measuring plates are forced away from each other, driving the movable tube to slide within the fixed tube, causing the spring inside to compress. The elastic force of the spring enables the measuring plate to fit tightly against the side of the pier column, and the two measuring plates move the same distance, making it convenient to check the diameter of the pier column with a measuring ruler.

[0021] 2. First, rotate the two connecting rulers 90° to make them perpendicular to the measuring rulers, thereby reducing the occupied area. Then, push the two measuring plates together so that the two piston plates are inside the sleeve block. At this time, the fixed block is no longer limited by the movable groove, and the measuring plate can be rotated 90°, allowing the horizontal measuring plate to be rotated to a vertical state, further reducing the occupied area and realizing the storage of the measuring equipment. When measurement is required, simply rotate the connecting ruler 90° in the opposite direction to be flush with the measuring ruler, and rotate the measuring plate 90° in the opposite direction. Then, pull the measuring plate so that the movable groove limits the fixed block, which can ensure the stability of the horizontal measuring plate, making it only movable and unable to rotate.

[0022] 3. When the two measuring plates move away from each other, the gas in the fixed cylinder is squeezed by the movement of the piston plate, and the gas enters the piston plate through the second air inlet. The gas in the piston plate can be transmitted to the gas transmission channel through the movable tube, and finally discharged from the air outlet to blow onto the guide roller to blow off the mud and dust on it. When the two measuring plates approach each other, the gas in the sleeve is squeezed into the inside of the piston plate through the first air inlet, which can still clean the guide roller and prevent the adhesion of mud and dust from affecting the accuracy of measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 Schematic diagram of the worm gear and worm structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the top view of the measuring plate and the connecting plate of the present invention;

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the measuring plate of the present invention;

[0027] Figure 5This is a schematic diagram of the cross-sectional structure of the fixing cylinder of the present invention;

[0028] Figure 6 This is a schematic diagram of the fixing groove structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the side view of the sleeve block structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the folding structure of the connecting ruler of the present invention;

[0031] Figure 9 This is a schematic diagram of the overall storage structure of the present invention;

[0032] Figure 10 It is a schematic diagram of the cross-sectional structure of the sleeve block of the present invention.

[0033] In the figure: 1. cart; 2. movable cylinder; 3. worm gear; 4. worm; 5. rocker; 6. protective box; 7. screw; 8. fixed rod; 9. support seat; 10. fixed cylinder; 11. measuring ruler; 12. connecting ruler; 13. sleeve block; 14. air inlet valve; 15. movable pipe; 16. piston plate; 17. fixed block; 18. movable groove; 19. first air inlet; 20. second air inlet; 21. pointer; 22. measuring plate; 23. connecting plate; 24. air transmission channel; 25. air outlet; 26. fixed groove; 27. guide roller. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figures 1-10 , the present invention provides the following technical solutions:

[0036] Example 1: In order to solve the problems existing in the prior art, this embodiment adopts the following technical solutions: a circular bridge pier diameter measuring device, comprising: a trolley 1, two movable cylinders 2 are symmetrically provided on the upper end surface of the trolley 1, and the movable cylinder 2 on the left and the trolley 1 are fixedly connected, and the movable cylinder 2 on the right and the trolley 1 are rotatably connected, a worm gear 3 is fixedly provided on the outer side of the movable cylinder 2 on the right, and a worm 4 is meshedly connected to the side of the worm gear 3, a rocker 5 is fixed to the end of the worm 4, and the rocker 5 rotates and passes through the side of the protective box 6, and the protective box 6 is sleeved on the outside of the worm wheel 3 and the worm 4, and the protective box 6 is fixedly connected to the trolley 1; it also includes: a screw rod 7, which is threadedly inserted into the movable cylinder 2 on the right, and a fixed rod 8 is slidably inserted into the inside of the movable cylinder 2 on the left, and the top of the fixed rod 8 and the screw rod 7 are fixedly connected to the lower end surface of the support seat 9. A measuring mechanism is provided above the support seat 9, and the measuring mechanism can be expanded to measure the diameter of the pier column. The measuring mechanism can be stored to reduce the occupied space. A cleaning mechanism is provided on the inside of the measuring mechanism, and the cleaning mechanism is used to clean the mud and plaster adhering to the measuring mechanism; such as Figure 1-Figure 2 As shown, before measuring the pier, the height of the measuring mechanism can be adjusted, and the rocker 5 is rotated to drive the worm 4 to rotate, and then the movable cylinder 2 on the right is driven to rotate through the meshing transmission of the worm 4 and the worm wheel 3. In this way, the threaded transmission between the movable cylinder 2 and the screw rod 7 can drive the screw rod 7 to extend, and drive the fixed rod 8 to slide in the movable cylinder 2, and drive the support seat 9 to rise, so that the height of the measuring mechanism can be adjusted, thereby meeting the measurement of the diameters of piers at different heights.

[0037] The traditional method of measuring pier columns is to use a manual handheld measuring ruler 11, so there is a certain error in the measurement, and repeated measurements are required, which increases the construction time. In addition, the measuring equipment takes up a lot of space and is not convenient to fold and store. Figure 1 、 Figure 3-Figure 5 and Figure 7-10As shown, the measuring mechanism includes a fixed cylinder 10 fixed above the support seat 9, and the middle of the fixed cylinder 10 is disconnected, the disconnection is fixedly connected by a sleeve 13, and a measuring ruler 11 is fixed to the side of the sleeve 13; both ends of the measuring ruler 11 are provided with a connecting ruler 12, and the connecting ruler 12 forms a rotating structure with the measuring ruler 11 through a damping member, and the rotation range of the connecting ruler 12 is 0-90°; the measuring mechanism also includes a measuring plate 22 provided at both ends of the fixed cylinder 10, and the measuring plate 22 is connected to the fixed cylinder 10 through a movable tube 15, and a pointer 21 is fixed at both ends of the fixed cylinder 10, and the pointer 21 is away from the end of the fixed cylinder 10 and the measuring ruler The measuring plate 22 is in contact with the surface of the ruler 11, and the spacing between the two pointers 21 is equal to the spacing between the two guide rollers 27 arranged opposite each other. A connecting plate 23 is fixed to the end of the measuring plate 22 away from the movable tube 15. The connecting plate 23 and the measuring plate 22 are an integrated structure. The measuring plate 22 and the connecting plate 23 are each provided with a fixing groove 26. At the same time, guide rollers 27 are rotatably provided inside the fixing groove 26, and the guide rollers 27 are distributed at equal intervals. The measuring plates 22 and the connecting plates 23 are symmetrically distributed about the vertical axis of the sleeve block 13. The two measuring plates 22 and the two connecting plates 23 move in opposite directions. The two measuring plates 22 are parallel to each other, and the two connecting plates 23 are both inclined.The device is pushed to the vicinity of the pier column by the trolley 1, so that the pier column is between the two connecting plates 23 and the trolley 1 is continued to be pushed. The inclined connecting plate 23 can make the push smoother. When the side of the pier column contacts the guide roller 27, the guide roller 27 can be driven to rotate, which can improve the smoothness of the movement of the connecting plate 23. When the pier column is between the two connecting plates 23, the device is pushed to the vicinity of the pier column, so that the pier column is between the two measuring plates 22. The two measuring plates 22 are forced to move away from each other, and the movable tube 15 is driven to slide in the fixed tube 10, driving the movable tube 15 inside the fixed tube 10. The spring is compressed, and the elastic force of the spring enables the measuring plate 22 to fit tightly against the side of the pier column. When the measuring plate 22 moves, the pointer 21 moves on the measuring ruler 11 and the connecting ruler 12, and the diameter of the pier column can be easily checked through the scales on them. Since the pointer 21 always moves with the measuring plate 22, the initial distance between the two pointers 21 is the same as the initial distance between the two guide rollers 27. The specific size of the pier column when measuring is calculated based on the distance the measuring plate 22 drives the pointer 21 to move, that is, the initial distance plus the distance between the two guide rollers 27. Times the moving distance. After the measurement is completed, pull the cart 1 to drive the measuring plate 22 and the connecting plate 23 to separate from the pier column. The two measuring plates 22 are driven close to each other by the resilience of the spring. When the measuring equipment needs to be folded and stored, first rotate the two connecting rulers 12 90 degrees to be perpendicular to the measuring ruler 11 to reduce the occupied area. Then push the two measuring plates 22 close together, drive the movable tube 15 to slide in the fixed cylinder 10, and let the two piston plates 16 be inside the sleeve block 13. At this time, the fixed block 17 on the piston plate 16 is not affected by the movable groove. The limiter 18 can rotate the measuring plate 22 90°, allowing the horizontal measuring plate 22 to rotate to a vertical position, further reducing the occupied area and facilitating the movement of the device to other locations. When measurement is required, simply rotate the connecting scale 12 90° in the opposite direction to align it with the measuring scale 11, and then rotate the measuring plate 22 90° in the opposite direction. Then, pull the measuring plate 22 to drive the piston plate 16 into contact with the fixed cylinder 10. The movable groove 18 limits the fixed block 17, ensuring the stability of the horizontal measuring plate 22, making it movable and unable to rotate.

[0038] Embodiment 2: After the measuring device contacts the pier column, the mud on the pier column will fall onto the measuring device. However, there is no structure to clean the mud during the measurement process, which affects the clarity of the scale. Usually, it is cleaned manually after the measurement. Therefore, this embodiment adopts the following technical solutions, such as Figure 4-Figure 6As shown, the cleaning mechanism includes a one-way air inlet valve 14 arranged on the sleeve block 13, and the air inlet valve 14 is arranged at both ends of the fixed cylinder 10, and a piston plate 16 is fixed to the end of the movable tube 15 away from the measuring plate 22, and the piston plate 16 is set to be hollow inside, and fixed blocks 17 are symmetrically arranged at the edge of the piston plate 16; a movable groove 18 is opened in the fixed cylinder 10 outside the fixed block 17, and the fixed block 17 forms a sliding structure with the fixed cylinder 10 through the movable groove 18, and the maximum distance between the two fixed blocks 17 is equal to the inner diameter of the sleeve block 13, and the inner diameter of the sleeve block 13 is larger than the inner diameter of the fixed cylinder 10; a one-way first air inlet is respectively provided on both sides of the piston plate 16 19 and the second air inlet 20, and the first air inlet 19 is communicated with the inside of the sleeve 13, and the second air inlet 20 is communicated with the inside of the fixed cylinder 10, and the movable tube 15 and the fixed cylinder 10 are slidably connected, the movable tube 15 and the measuring plate 22 are fixedly connected, and the outer side of the movable tube 15 is fixedly wound with a spring for returning it, and the end of the spring away from the movable tube 15 is in contact with the fixed cylinder 10; the movable tube 15 and the air delivery channel 24 are communicated with each other, and the air delivery channel 24 is opened in the measuring plate 22 and the connecting plate 23, and the inner sides of the measuring plate 22 and the connecting plate 23 are reserved with air outlet holes 25, the air outlet holes 25 are arranged at equal intervals, and the air outlet holes 25 and The guide rollers 27 are distributed accordingly, and the rotation range of the measuring plate 22 and the piston plate 16 is 0-90°; when the measuring plate 22 and the connecting plate 23 are pushed to contact the pier, the plaster on the pier will fall onto the equipment. Therefore, when the two measuring plates 22 move away from each other, the gas in the fixed cylinder 10 is squeezed by the movement of the piston plate 16, and the gas enters the cavity of the piston plate 16 through the second air inlet 20. At this time, the two piston plates 16 move away from each other, so that a negative pressure is generated in the sleeve block 13, and the external gas can enter it through the air inlet valve 14 on the sleeve block 13. The gas in the piston plate 16 can be transmitted to the gas transmission channel 24 through the movable pipe 15, and finally discharged from the air outlet 25 The air is blown onto the guide roller 27. Therefore, during the contact process between the measuring plate 22 and the pier, the blown gas can blow off the mud on the guide roller 27, and the tightness of the contact between the guide roller 27 and the pier is improved by cleaning, thereby improving the accuracy of the measurement. When the two measuring plates 22 approach each other, the external air is drawn in from the air inlet valve 14 on the fixed cylinder 10 through the movement of the piston plate 16, and the gas in the sleeve block 13 is squeezed into the interior of the piston plate 16 through the first air inlet 19, which can still achieve the cleaning of the guide roller 27 and prevent the adhesion of mud from affecting the accuracy of the measurement. In addition, a one-way valve is provided in the air inlet valve 14 and the air inlet to effectively prevent gas backflow.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A circular bridge pier diameter measuring device, comprising: A cart (1), wherein two movable cylinders (2) are symmetrically provided on the upper end surface of the cart (1); It is characterized by further comprising: A screw rod (7) is threadedly passed through the movable cylinder (2) on the right side, and a fixed rod (8) is slidably passed through the inside of the movable cylinder (2) on the left side, and the top of the fixed rod (8) and the screw rod (7) are fixedly connected to the lower end surface of the support seat (9), and a measuring mechanism is provided above the support seat (9), and the measuring mechanism can be expanded to measure the diameter of the pier column, and the measuring mechanism can be stored to reduce the occupied space, and a cleaning mechanism is provided on the inner side of the measuring mechanism, and the cleaning mechanism is used to clean the mud and ash adhered to the measuring mechanism; The measuring mechanism comprises a fixed cylinder (10) fixed above the support seat (9), and the middle of the fixed cylinder (10) is disconnected, and the disconnected portion is fixedly connected by a sleeve block (13), and a measuring ruler (11) is fixed to the side of the sleeve block (13); the measuring mechanism further comprises a measuring plate (22) arranged at both ends of the fixed cylinder (10), and the measuring plates (22) are connected to each other through a movable tube (15) and the fixed cylinder (10); a connecting plate (23) is fixed to one end of the measuring plate (22) away from the movable tube (15), and the connecting plate (23) and the measuring plate (22) are an integrated structure, and a fixing groove (26) is provided inside the measuring plate (22) and the connecting plate (23), and a guide roller (27) is rotatably provided inside the fixing groove (26), and the guide rollers (27) are evenly spaced, and the two connecting plates (23) are both inclined. The cleaning mechanism includes a one-way air inlet valve (14) arranged on the sleeve block (13), and the air inlet valve (14) is arranged at both ends of the fixed cylinder (10); a piston plate (16) is fixed to the end of the movable tube (15) away from the measuring plate (22), and the piston plate (16) is hollow, and a fixed block (17) is symmetrically arranged at the edge of the piston plate (16); a one-way first air inlet (19) and a second air inlet (20) are respectively arranged on both sides of the piston plate (16), and the first air inlet (19) is communicated with the inside of the sleeve block (13), and the second air inlet (20) is communicated with the inside of the fixed cylinder (10); the movable tube (15) and the air delivery channel (24) are communicated with each other, and the air delivery channel (24) is opened in the measuring plate (22) and the connecting plate (23), and the inner sides of the measuring plate (22) and the connecting plate (23) are both reserved with air outlet holes (25).

2. The circular bridge pier diameter measuring device according to claim 1, characterized in that: The movable cylinder (2) on the left side and the trolley (1) are fixedly connected, and the movable cylinder (2) on the right side and the trolley (1) are rotatably connected. A worm wheel (3) is fixedly sleeved on the outer side of the movable cylinder (2) on the right side, and a worm (4) is meshedly connected to the side of the worm wheel (3). A rocker (5) is fixed to the end of the worm (4), and the rocker (5) rotates and passes through the side of the protective box (6). The protective box (6) is sleeved on the outer side of the worm wheel (3) and the worm (4), and the protective box (6) and the trolley (1) are fixedly connected.

3. The circular bridge pier diameter measuring device according to claim 1, characterized in that: Both ends of the measuring ruler (11) are provided with connecting rulers (12), and the connecting ruler (12) forms a rotation structure with the measuring ruler (11) through a damping member, and the rotation range of the connecting ruler (12) is 0-90 degrees.

4. The circular bridge pier diameter measuring device according to claim 1, characterized in that: Pointers (21) are fixed at both ends of the fixed cylinder (10), and the end of the pointer (21) away from the fixed cylinder (10) contacts the surface of the measuring ruler (11), and the distance between the two pointers (21) is equal to the distance between the two guide rollers (27) distributed opposite to each other.

5. The circular bridge pier diameter measuring device according to claim 1, characterized in that: The measuring plates (22) and the connecting plates (23) are symmetrically distributed about the vertical axis of the sleeve block (13), the two measuring plates (22) and the two connecting plates (23) move in opposite directions, and the two measuring plates (22) are parallel to each other.

6. The circular bridge pier diameter measuring device according to claim 1, characterized in that: A movable groove (18) is provided in the fixed cylinder (10) outside the fixed block (17), and the fixed block (17) forms a sliding structure through the movable groove (18) and the fixed cylinder (10), and the maximum distance between the two fixed blocks (17) is equal to the inner diameter of the sleeve block (13), and the inner diameter of the sleeve block (13) is larger than the inner diameter of the fixed cylinder (10).

7. The circular bridge pier diameter measuring device according to claim 1, characterized in that: The movable tube (15) and the fixed tube (10) are in sliding connection, the movable tube (15) and the measuring plate (22) are in fixed connection, and a spring for resetting the movable tube (15) is fixedly wound around the outer side of the movable tube (15), and the end of the spring away from the movable tube (15) is in close contact with the fixed tube (10).

8. The circular bridge pier diameter measuring device according to claim 1, characterized in that: The air outlet holes (25) are arranged at equal intervals, and the air outlet holes (25) and the guide rollers (27) are distributed correspondingly. The rotation ranges of the measuring plate (22) and the piston plate (16) are both 0-90 degrees.

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