CN115356063A - A testing device for bearing capacity of highway bridge - Google Patents

Abstract

The invention discloses a detection device for the bearing capacity of a highway bridge, which comprises a base plate detachably connected to a transport vehicle, support plates are respectively fixedly connected to both sides of the top surface of the base plate, two support plates are arranged symmetrically, and a lift is arranged between the two support plates. The two ends of the lifting plate are respectively slidingly connected with the supporting plate. The supporting plate is provided with a secondary lifting part to control the up and down movement of the lifting plate. Two sliding plates are symmetrically arranged at both ends of the lifting plate, and the sliding plate is slidingly connected with the lifting plate. , each sliding plate is fixedly connected with a telescopic arm, the side wall of the lifting plate is equipped with an adjustment part to control the distance between the two telescopic arms, and the telescopic arm is provided with a control part and a limit part to control its expansion and contraction, and the telescopic arm is far away from the One end of the sliding plate is installed with a measurement induction component; the invention has a reasonable structure and is easy to use, can ensure the adjustment accuracy under the premise of ensuring the speed of height adjustment, and can limit and protect the telescopic length of the telescopic arm, and has a high stability.

Description

A testing device for bearing capacity of highway bridge

technical field

The invention relates to the technical field of bridge detection, in particular to a device for detecting the bearing capacity of highway bridges.

Background technique

The bridge detection device is a detection device that observes the stress-bearing parts of the bridge, the degree of deformation of the bridge deck and the flatness of the bridge deck connection; the traditional bridge detection is manual detection, and the inspection personnel need to observe the bridge structure at the bottom of the bridge , to evaluate the state of the bridge body, because the inspection personnel are far away from the bridge body, it is difficult for the inspection personnel to conduct a comprehensive observation of the details of the bridge body structure, which reduces the accuracy of detection and increases the risk factor of the inspection personnel , in the prior art, the detection device is generally used for detection, but the detection device in the prior art is generally installed on the car, and the supporting arm similar to the crane is used to move the sensing device to the vicinity of the bridge, but in the prior art, a vertical height The adjustment is fast but the accuracy is poor, and the sensing device cannot move to the most suitable observation height. The other has high precision but the adjustment of the vertical height is slow, which makes the overall adjustment time too long. In the prior art, in order to make the sensing device as close as possible to the bridge, generally The support arm is designed as a telescopic structure, but the telescopic support arm in the prior art lacks a limit structure. After the drive is stopped, the length of the telescopic arm may change, thereby affecting the distance between the sensing device and the bridge. Only one end of the arm is fixed, and the other end is suspended, so it is very important for the protection and limit structure of the telescopic arm. Therefore, there is an urgent need for a highway bridge bearing that can adjust the height quickly and with high precision, and can limit the telescopic length of the telescopic arm in time. Force detection device.

Contents of the invention

The purpose of the present invention is to provide a highway bridge bearing capacity detection device to solve the above-mentioned problems in the prior art.

In order to achieve the above object, the present invention provides the following scheme: the present invention provides a road bridge bearing capacity detection device, comprising a base plate detachably connected to the transport vehicle, the two sides of the top surface of the base plate are respectively fixedly connected with support plates, two The supporting plates are arranged symmetrically, and a lifting plate is arranged between the two supporting plates, and the two ends of the lifting plates are respectively slidably connected with the supporting plates. The two-stage lifting part of the lifting plate, two sliding plates are symmetrically arranged at both ends of the side of the lifting plate, and the sliding plate is slidably connected with the lifting plate, and each of the sliding plates is fixedly connected with a telescopic arm. An adjustment part for controlling the distance between the two telescopic arms is installed on the side wall of the board. A control part and a limit part for controlling its expansion and contraction are arranged in the telescopic arms. Measure sensing components.

Preferably, the secondary lifting part includes a sliding cavity opened in the support plate, a lifting seat is slidably connected to the sliding cavity, a telescopic electric cylinder is fixedly installed on the top of the sliding cavity, and the telescopic electric cylinder stretches end is fixedly connected with the top of the lifting seat, the bottom end of the lifting seat is rotatably connected with a drum, and the bottom of the drum is fixedly connected with one end of a telescopic rod, and the other end of the telescopic rod penetrates the bottom wall of the sliding cavity and is connected with The bottom wall of the sliding cavity is rotatably connected, and a rotating part that controls the synchronous rotation of the two telescopic rods is installed in the bottom plate. A receiving groove is opened on the side of the sliding cavity close to the lifting plate, and the two lifting plates Both sides are fixedly connected with a connecting plate, and the connecting plate is slidably connected with the accommodating groove, and the rotating cylinder passes through the connecting plate and is threadedly connected with the connecting plate.

Preferably, the adjustment part includes a rotating piece located in the middle of the side wall of the lifting plate, the rotating piece is connected to the side wall of the lifting plate in rotation, and two ends of the rotating piece are fixedly connected with connecting posts, and the connecting posts An adjustment rod is rotatably connected to the top, and a push rod is fixedly connected to the side of the sliding plate close to the rotating piece. The push rod is rotatably connected to the adjustment rod, and the side wall of the lifting plate corresponds to the push rod. A limit sleeve is fixedly installed, the push rod penetrates through the limit sleeve and is slidably connected with the limit sleeve, an adjusting motor is fixedly installed inside the lifting plate, and the output shaft of the adjusting motor is fixedly connected with the rotating piece .

Preferably, the telescopic arm includes a support arm fixedly connected to the sliding plate, a chute is opened on one side of the support arm, and a sliding arm is slidably connected in the chute, and the measurement sensing component is located on the sliding plate. The end of the arm, the control part and the limiting part are all located on the support arm.

Preferably, the control part includes a control slot opened on the support arm, the control slot communicates with the chute, a control gear is rotatably connected in the control slot, and the sliding arm is close to the control gear A groove is opened on one side of the groove, and a rack meshing with the control gear is fixedly connected in the groove. A control motor is fixedly installed in the support arm, and the output shaft of the control motor is fixed to the control gear. connect.

Preferably, the limiting portion includes a first sliding groove and a second sliding groove opened in the support arm, both the first sliding groove and the second sliding groove communicate with the control groove, and the first sliding groove A limiting block is slidably connected in a sliding groove, a tension spring is fixedly connected between the limiting block and the bottom wall of the first sliding groove, and a side of the limiting block close to the sliding arm is provided with a The rack is fitted with a locking protrusion, the side of the limit block close to the control gear is provided with a tooth groove meshing with the control gear, and the top of the limit block is fixedly connected with a baffle, so A pushing block is slidably connected to the second sliding groove, the pushing block is adapted to the second sliding groove, the pushing block is arranged in contact with the baffle plate, and an air pump is fixedly installed on the outside of the support arm, so The air pump communicates with an end of the second sliding groove away from the baffle.

Preferably, the rotating part includes an accommodation cavity opened on the bottom plate, the bottom end of the telescopic rod is located in the accommodation cavity and is rotatably connected to the inner wall of the accommodation cavity, and the middle part of the accommodation cavity is rotatably connected to a rotating shaft. Two first sprockets are fixedly connected to the rotating shaft, and the two telescopic rods are located at one end of the accommodation cavity and are fixedly connected to the second sprockets corresponding to the different first sprockets. A sprocket and the corresponding second sprocket are driven by a chain, a driven gear is fixedly connected to the middle of the rotating shaft, a motor is fixedly connected to the bottom of the accommodating cavity, and a driving gear is fixedly connected to the output shaft of the rotating motor. The driving gear meshes with the driven gear.

Preferably, the telescopic rod includes several sliding sleeves slidingly connected along the axis direction, the size of several sliding sleeves in the same telescopic rod gradually decreases, and the sliding sleeve with the smallest size is fixedly connected to the drum , the sliding sleeve with the largest size is fixedly connected with the second sprocket.

The present invention discloses the following technical effects: the present invention can adjust the precise height of the lifting plate after quickly adjusting the height of the lifting plate through the secondary lifting part, and improve its precision so that the measurement sensing component is more suitable for the optimal detection height. The control part and the limit part are set up to control and limit the telescopic length of the telescopic arm to ensure the length of the telescopic arm. At the same time, the telescopic arm is limited and protected to prevent accidents. The distance between them can detect the two ends of bridges of different sizes at the same time, and the detection accuracy is high. The invention has a reasonable structure and is easy to use. The length is limited and protected, with high stability.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is the structural representation of detection device of the present invention;

Fig. 2 is a schematic structural view of the telescopic arm of the present invention;

Among them: 1. Bottom plate; 2. Support plate; 3. Lifting plate; 4. Sliding plate; 5. Telescopic arm; 6. Measuring induction component; 7. Sliding cavity; 8. Lifting seat; Drum; 11. Telescopic rod; 12. Accommodating groove; 13. Connecting plate; 14. Rotating piece; 15. Adjusting rod; 16. Push rod; 17. Limit sleeve; 18. Support arm; , sliding arm; 21, control groove; 22, control gear; 23, groove; 24, first sliding groove; 25, second sliding groove; 26, limit block; 27, tension spring; 28, baffle plate; 29 , pushing block; 30, air pump; 31, accommodation chamber; 32, rotating shaft; 33, first sprocket; 34, second sprocket; 35, driven gear; 36, rotating motor; 37, driving gear.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Figures 1-2, the present invention provides a road bridge bearing capacity detection device, which includes a bottom plate 1 detachably connected to the transport vehicle, and support plates 2 are fixedly connected to both sides of the top surface of the bottom plate 1, and the two support plates 2 are arranged symmetrically. A lifting plate 3 is arranged between the two supporting plates 2, and the two ends of the lifting plate 3 are respectively slidably connected with the supporting plate 2. The supporting plate 2 is provided with a secondary lifting part for controlling the up and down movement of the lifting plate 3. The sides of the lifting plate 3 Two sliding plates 4 are symmetrically arranged at both ends, and the sliding plates 4 are slidingly connected with the lifting plate 3. Each sliding plate 4 is fixedly connected with a telescopic arm 5. As for the distance adjusting part, the telescopic arm 5 is provided with a control part and a limiting part to control its expansion and contraction, and the end of the telescopic arm 5 far away from the sliding plate 4 is installed with a measurement sensing component 6 . The two-stage lifting part can adjust the precise height of the lifting plate 3 after quickly adjusting the height of the lifting plate 3, and improve its accuracy so that the measurement sensing component 6 is more suitable for the optimal detection height. At the same time, a control part and a limit part are set in the telescopic arm 5 , control and limit the telescopic length of the telescopic arm 5 to ensure the length of the telescopic arm 5, and at the same time limit and protect the telescopic arm 5 to prevent accidents, the adjustment part can adjust the distance between the two measuring sensing components 6 , can detect both ends of bridges with different sizes at the same time, and the detection accuracy is high.

To further optimize the scheme, the secondary lifting part includes a sliding chamber 7 opened in the support plate 2, a lifting seat 8 is slidably connected to the sliding chamber 7, a telescopic electric cylinder 9 is fixedly installed on the top of the sliding chamber 7, and the telescopic end of the telescopic electric cylinder 9 is connected to the The top of the lifting seat 8 is fixedly connected, the bottom end of the lifting seat 8 is rotatably connected to the drum 10, the bottom of the drum 10 is fixedly connected to one end of the telescopic rod 11, and the other end of the telescopic rod 11 runs through the bottom wall of the sliding chamber 7 and is connected to the bottom wall of the sliding chamber 7. Rotational connection, the bottom plate 1 is equipped with a rotating part that controls the synchronous rotation of the two telescopic rods 11, and the side of the sliding chamber 7 close to the lifting plate 3 is provided with a receiving groove 12, and both sides of the lifting plate 3 are fixedly connected with connecting plates 13. The plate 13 is slidably connected with the receiving groove 12 , and the drum 10 passes through the connecting plate 13 and is threadedly connected with the connecting plate 13 . The telescopic electric cylinder 9 drives the lifting seat 8 to move up and down to quickly adjust the height of the lifting plate, and then drives the rotating drum 10 to rotate through the rotating part, so that the lifting plate 3 can be adjusted with high precision, so that the lifting plate 3 can be stabilized at the optimal detection height , so that the measurement sensing components are stabilized at the optimum detection height.

To further optimize the scheme, the adjustment part includes a rotating piece 14 located in the middle of the side wall of the lifting plate 3, the rotating piece 14 is rotatably connected to the side wall of the lifting plate 3, the two ends of the rotating piece 14 are fixedly connected with connecting columns, and the connecting columns are rotatably connected with adjusting rods 15. The sliding plate 4 is fixedly connected with a push rod 16 on the side close to the rotating piece 14, and the push rod 16 is connected with the adjusting rod 15 in rotation. Through the limit sleeve 17 and slidingly connected with the limit sleeve 17, an adjusting motor is fixedly installed in the lifting plate 3, and the output shaft of the adjusting motor is fixedly connected with the rotating piece 14. The rotating piece 14 is driven to rotate by adjusting the motor, and then the push rod 16 is pushed or pulled by the two adjusting rods 15, so that the sliding plate 4 slides toward or away from each other, thereby adjusting the distance between the two telescopic arms 5, and then adjusting the two measuring rods. Sensing the distance between components.

Further, a number of sliding projections are fixedly connected to the side wall of the lifting plate 3, and the bottom of the sliding plate 4 is provided with a matching groove that is compatible with the sliding projection. 3 Swipe towards or away from each other.

In a further optimization scheme, the telescopic arm 5 includes a support arm 18 fixedly connected to the sliding plate 4, a chute 19 is provided on one side of the support arm 18, and a sliding arm 20 is slidably connected to the chute 19, and the measurement sensing component 6 is located at the end of the sliding arm 20 The part, the control part and the limit part are all located on the support arm 18 .

To further optimize the scheme, the control part includes a control groove 21 opened on the support arm 18, the control groove 21 communicates with the chute 19, and the control gear 22 is rotatably connected in the control groove 21, and the side of the sliding arm 20 close to the control gear 22 is provided with a The groove 23 is fixedly connected with a rack meshed with the control gear 22 in the groove 23 , and a control motor is fixedly installed in the support arm 18 , and the output shaft of the control motor is fixedly connected with the control gear 22 . The control motor drives the control gear 22 to rotate, and the sliding arm 20 is driven to move by the control gear 22 meshing with the rack, so as to realize the control of the length of the telescopic arm 5 .

In a further optimization scheme, the stopper includes a first sliding groove 24 and a second sliding groove 25 opened in the support arm 18, the first sliding groove 24 and the second sliding groove 25 are all connected to the control groove 21, and the first sliding groove 24 is slidably connected with a limit block 26, and a tension spring 27 is fixedly connected between the limit block 26 and the bottom wall of the first slide groove 24, and the side of the limit block 26 near the sliding arm 20 is provided with a tooth bar that is suitable for the rack. The clamping protrusion, the side of the limit block 26 close to the control gear 22 is provided with a tooth groove meshing with the control gear 22, the top of the limit block 26 is fixedly connected with a baffle plate 28, and the second sliding groove 25 is slidingly connected with a push Block 29, the pushing block 29 is adapted to the second sliding groove 25, the pushing block 29 is arranged in contact with the baffle plate 28, the air pump 30 is fixedly installed on the outside of the support arm 18, and the air pump 30 and the second sliding groove 25 are away from one end of the baffle plate 28 connected. When it is necessary to limit the position, air is blown into the second sliding groove 25 by the air pump 30, and then the push block 29 is pushed to move, and the push block 29 pushes the limit block 26 to move through the baffle plate 28, so that the limit block 26 is in the position of the control gear. 22 and the push block 29 move toward the sliding arm 20 and contact the rack to form a limit. When the limit needs to be canceled, start the air pump 30 to evacuate the second sliding groove 25, and then use the control gear 22 to drive the telescopic rod 11 Stretch a part, limit block 26 moves in the first slide groove 24 under the effect of control gear 22 and tension spring 27, no longer contacts with rack, then adjusts the length of telescopic rod 11 by control gear 22 and gets final product.

To further optimize the solution, the rotating part includes a housing cavity 31 opened on the bottom plate 1. The bottom end of the telescopic rod 11 is located in the housing cavity 31 and is rotatably connected to the inner wall of the housing cavity 31. The middle part of the housing cavity 31 is rotatably connected to a rotating shaft 32. Two first sprockets 33 are fixedly connected, and two telescopic rods 11 are located at one end of the housing chamber 31 and correspond to different first sprockets 33. A second sprocket 34 is fixedly connected, and the first sprocket 33 and the corresponding first sprocket The second sprocket 34 is driven by a chain, the middle part of the rotating shaft 32 is fixedly connected with a driven gear 35, the bottom of the housing chamber 31 is fixedly connected with a rotating motor 36, and the output shaft of the rotating motor 36 is fixedly connected with a driving gear 37, and the driving gear 37 is connected with the driven gear. 35 meshed. Drive the driving gear 37 to rotate by the rotating motor 36, and then drive the rotating shaft 32 to rotate by the driven gear 35, and then drive the two telescopic rods 11 to rotate synchronously through the chain transmission between the first sprocket 33 and the second sprocket 34, Further, power is provided for the rotation of the drum 10 .

To further optimize the solution, the telescopic rod 11 includes several sliding sleeves that are slidably connected along the axial direction, and the size of several sliding sleeves in the same telescopic rod 11 is gradually reduced, the sliding sleeve with the smallest size is fixedly connected with the drum 10, and the largest The sliding sleeve is fixedly connected with the second sprocket 34 . Sliding between the sliding sleeves along the axis can ensure that the telescopic rod 11 rotates under the action of the rotating part under the premise of maintaining the telescopic performance, and then drives the drum 10 to rotate.

To further optimize the scheme, the measurement sensing component 6 is a bridge health monitoring sensor, which can detect various parameters of the bridge. This device is a prior art, and will not be described again.

The working process of the present invention: when in use, move the device as a whole to the designated working area, then check the measurement sensing components to ensure their normal operation, start the telescopic electric cylinder 9, and the telescopic electric cylinder 9 drives the lifting seat 8 to move up and down quickly. When the assembly is close to the optimum detection height, stop, then start the rotating motor 36, and the rotating motor 36 drives the rotating shaft 32 to rotate through the engagement of the driving gear 37 and the driven gear 35, and then passes through the first sprocket wheel 33 and the second sprocket wheel 34. The chain transmission drives the telescopic rod 11 to rotate, and then drives the rotating cylinder 10 to rotate. Since the rotating cylinder 10 is screwed to the connecting plate 13, it can drive the connecting plate 13 to move up and down, and then accurately adjust the height of the measuring and sensing components to make it stable at the optimum detection level. height, and then the rotating piece 14 is driven to rotate by adjusting the motor. During the rotation of the rotating piece 14, the adjusting rod 15 is used to pull or push the push rod 16, so that the sliding plate 4 slides laterally on the side wall of the lifting plate 3, and then the two telescopic arms 5 are adjusted. to adjust the distance between the two measurement sensing components so that it is suitable for the detection of bridges of various sizes, and then start the control motor, which drives the control gear 22 to rotate, and then drives the sliding arm 20 through the rack Moving up and down, when the telescopic arm 5 is extended, the air pump 30 draws negative pressure in the second slide groove 25, and then the limit block 26 moves into the first slide groove 24 under the action of negative pressure, tension spring and control gear 22 , the limit block 26 no longer limits the rack. When the length is suitable, reversely rotate the control gear 22, and at the same time use the air pump 30 to blow air into the second slide groove 25, so that the limit block 26 is connected between the air and the control gear. 22 is in contact with the rack to form a clamping connection, which limits and protects the sliding arm 20 and improves the stability of the device.

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation.

The above-mentioned embodiments are only to describe the preferred mode of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (8)

1. a highway bridge bearing capacity detection device is characterized in that: comprise the base plate (1) that is detachably connected with transport vehicle, described base plate (1) top surface both sides are respectively fixedly connected with support plate (2), two The supporting plates (2) are arranged symmetrically, and a lifting plate (3) is arranged between the two supporting plates (2), and the two ends of the lifting plate (3) are respectively slidingly connected with the supporting plates (2) , the support plate (2) is provided with a two-level lifting part to control the up and down movement of the lifting plate (3), and two sliding plates (4) are symmetrically arranged at both ends of the side of the lifting plate (3). The sliding plate (4) is slidingly connected with the lifting plate (3), each of the sliding plates (4) is fixedly connected with a telescopic arm (5), and the side wall of the lifting plate (3) is equipped with two control The adjustment part of the distance between the telescopic arms (5), the telescopic arm (5) is provided with a control part and a limit part to control its telescopic expansion, and the telescopic arm (5) is far away from the sliding plate (4) One end of the measuring sensor assembly (6) is installed. 2. A kind of highway bridge bearing capacity detection device according to claim 1, it is characterized in that: said secondary lifting part comprises the sliding chamber (7) that is opened in said support plate (2), and said sliding chamber (7) is slidingly connected with a lifting seat (8), the top of the sliding chamber (7) is fixedly equipped with a telescopic electric cylinder (9), and the telescopic end of the telescopic electric cylinder (9) is connected to the top Fixedly connected, the bottom end of the lifting seat (8) is rotatably connected with a drum (10), the bottom of the drum (10) is fixedly connected with one end of a telescopic rod (11), and the other end of the telescopic rod (11) runs through The bottom wall of the sliding cavity (7) is rotatably connected with the bottom wall of the sliding cavity (7), and a rotating part for controlling the synchronous rotation of the two telescopic rods (11) is installed in the bottom plate (1). The side of the sliding chamber (7) close to the lifting plate (3) is provided with a receiving groove (12), and both sides of the lifting plate (3) are fixedly connected with connecting plates (13), and the connecting plate (13) Slidingly connected with the receiving groove (12), the rotating cylinder (10) passes through the connecting plate (13) and is threadedly connected with the connecting plate (13). 3. A kind of highway bridge bearing capacity detection device according to claim 1, is characterized in that: described regulating part comprises the rotating piece (14) that is positioned at the middle part of side wall of described lifting plate (3), described rotating piece ( 14) It is rotatably connected with the side wall of the lifting plate (3), the two ends of the rotatable piece (14) are fixedly connected with a connecting column, and the connecting column is rotatably connected with an adjustment rod (15), and the sliding plate (4) ) is fixedly connected with a push rod (16) near the side of the rotating piece (14), the push rod (16) is connected with the adjustment rod (15) in rotation, and the side wall of the lifting plate (3) is connected with The push rod (16) is correspondingly fixedly installed with a limit sleeve (17), the push rod (16) passes through the limit sleeve (17) and is slidably connected with the limit sleeve (17), and the lifting plate (3) An adjusting motor is fixedly installed inside, and the output shaft of the adjusting motor is fixedly connected with the rotating piece (14). 4. A kind of highway bridge bearing capacity detection device according to claim 1, is characterized in that: described telescopic arm (5) comprises the support arm (18) that is fixedly connected with described slide plate (4), and described support A chute (19) is provided on one side of the arm (18), and a sliding arm (20) is slidably connected in the chute (19), and the measurement sensing component (6) is located at the end of the sliding arm (20), Both the control part and the limiting part are located on the support arm (18). 5. A kind of highway bridge bearing capacity detection device according to claim 4, is characterized in that: described control part comprises the control groove (21) that is opened in described support arm (18), and described control groove (21) It communicates with the chute (19), the control gear (22) is rotatably connected in the control groove (21), and the side of the sliding arm (20) close to the control gear (22) is provided with a groove (23), the tooth rack meshed with the control gear (22) is fixedly connected in the groove (23), the control motor is fixedly installed in the support arm (18), and the output shaft of the control motor is connected to the The control gear (22) is fixedly connected. 6. The detection device for the bearing capacity of a highway bridge according to claim 5, characterized in that: the limiting part comprises a first slide groove (24) and a second slide groove (24) opened in the support arm (18). groove (25), the first sliding groove (24) and the second sliding groove (25) are all in communication with the control groove (21), and the limited block ( 26), a tension spring (27) is fixedly connected between the limiting block (26) and the bottom wall of the first sliding groove (24), and the limiting block (26) is close to the sliding arm (20) One side of the stopper (26) is provided with a snap-in protrusion that is suitable for the rack, and the side of the limit block (26) close to the control gear (22) is provided with a tooth groove, the top of the limiting block (26) is fixedly connected with a baffle plate (28), and a pushing block (29) is slidably connected in the second sliding groove (25), and the pushing block (29) is connected with the The second sliding groove (25) is adapted, the pushing block (29) is arranged in contact with the baffle plate (28), and an air pump (30) is fixedly installed on the outside of the support arm (18), and the air pump ( 30) communicate with the end of the second slide groove (25) away from the baffle plate (28). 7. A detection device for the bearing capacity of a highway bridge according to claim 2, characterized in that: the rotating part includes an accommodating cavity (31) opened in the bottom plate (1), and the bottom of the telescopic rod (11) The end is located in the accommodating chamber (31) and is rotatably connected with the inner wall of the accommodating chamber (31). There are two first sprockets (33), and the two telescopic rods (11) are located at one end of the accommodation chamber (31) and are fixedly connected to different first sprockets (33) with second chains wheel (34), the first sprocket (33) and the corresponding second sprocket (34) are driven by a chain, and the middle part of the rotating shaft (32) is fixedly connected with a driven gear (35). The bottom of the housing cavity (31) is fixedly connected with a rotating motor (36), and the output shaft of the rotating motor (36) is fixedly connected with a driving gear (37), and the driving gear (37) is in phase with the driven gear (35). engage. 8. A kind of highway bridge bearing capacity detection device according to claim 7, it is characterized in that: described telescoping rod (11) comprises several sliding bushings that are slidably connected along the axial direction, and several sliding sleeves in the same telescopic rod (11) The size of the sliding sleeves decreases gradually, the sliding sleeve with the smallest size is fixedly connected with the drum (10), and the sliding sleeve with the largest size is fixedly connected with the second sprocket (34).

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