High-precision bridge expansion joint testing machine

Abstract

The utility model relates to a high accuracy bridge expansion joint testing machine relates to bridge engineering detection equipment field, including test bench, fixed support, moving support, screw rod drive mechanism, drive system, controller, hang beam, fixed support is fixed on test bench, and moving support is slidably installed on the guide rail of test bench top surface, fixed support, moving support respectively install the clamping mechanism for fixed hang beam, and screw rod drive mechanism includes driving screw rod and nut, and the nut is fixedly installed in moving support, drive system includes two frequency conversion motors, and the output end of frequency conversion motor is connected with driving screw rod transmission, controller is electrically connected with two frequency conversion motors, is used for controlling frequency conversion motor positive and negative rotation to drive moving support realizes compression and stretching action, and hang beam is connected with expansion joint sample through integrated hook, the utility model discloses can avoid the distortion of test data due to the inconsistency of frequency, can significantly improve the clamping stability and positioning accuracy, guarantees test result accurate.

Description

Technical Field

[0001] This utility model relates to the technical field of bridge engineering testing equipment, specifically a high-precision bridge expansion joint testing machine. Background Technology

[0002] Bridge expansion joints are an important component of highway bridges, and their assembly tolerances and waterproofing performance directly affect the bridge's service life and traffic safety. Therefore, during the production and application of bridge expansion joints, it is necessary to conduct compression and tensile simulation tests using specialized testing machines to verify whether their various performance characteristics meet relevant standards.

[0003] Existing bridge expansion joint testing machines have many shortcomings in use: First, the clamping mechanism only fixes the sample with simple hooks and clamping bolts, resulting in low positioning accuracy. The sample is prone to displacement during the test, affecting the accuracy of the test results.

[0004] Secondly, when using two motors for drive, the motor frequency needs to be manually adjusted to ensure synchronous operation, which is cumbersome and prone to frequency inconsistency, leading to distorted test data; and the machine is very prone to jamming when the two motors are not driven synchronously.

[0005] Third, the protective structure is poorly designed, resulting in poor protection of the lead screw transmission mechanism, which is easily damaged by impurities such as iron filings.

[0006] Fourth, the lack of real-time detection of expansion and contraction displacement and stress conditions makes it impossible to accurately obtain test data. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a high-precision bridge expansion joint testing machine to solve the technical problems of low testing accuracy and affecting the accuracy of test results in the existing technology.

[0008] The technical solution to the above-mentioned technical problems is as follows: a high-precision bridge expansion joint testing machine, including a test bench, a fixed support, a movable support, a screw drive mechanism, a drive system, a controller, and a hanging beam; the fixed support is fixed on the test bench, and the bottom of the movable support is mounted on a guide rail on the top surface of the test bench via a slider; the tops of the fixed support and the movable support are respectively equipped with clamping mechanisms for fixing the hanging beam; the screw drive mechanism includes a meshing active drive screw and a nut, with the nut fixedly installed inside the movable support; the drive system includes two variable frequency motors, the output end of each variable frequency motor being connected to the active drive screw of the corresponding work position screw drive mechanism, for driving the movable support to move axially along the active drive screw; the controller is fixed on one side of the test bench and electrically connected to the two variable frequency motors, for controlling the forward and reverse rotation of the variable frequency motors to drive the movable support to achieve compression and tension actions; the hanging beam is connected to the expansion joint sample via an integrated hook.

[0009] A further technical solution of this utility model is that the clamping mechanism includes a clamping platform with a positioning groove, a clamping bolt, a clamping spring, a pressure regulating motor, and a pressure sensor; the clamping platforms are respectively fixedly installed on the top of a fixed support and a movable support, with the openings of the positioning grooves of the two clamping platforms facing each other; the clamping bolt is installed on the top of the clamping platform; the clamping spring and the pressure sensor are sleeved on the clamping bolt; the signal output terminal of the pressure sensor is electrically connected to the signal input terminal of the controller; the signal output terminal of the controller is electrically connected to the signal input terminal of the pressure regulating motor; and the output shaft of the pressure regulating motor is connected to the clamping bolt.

[0010] A further technical solution of this utility model is that the hanging beam is two parallel longitudinal beams; one end of the integrated hook has a T-shaped groove that connects with the hanging beam, and the other end of the integrated hook has an opening groove on its top surface for installing expansion joint samples.

[0011] A further technical solution of this utility model is that the bottom of the slider is provided with a dovetail groove, which slides in cooperation with the guide rail.

[0012] A further technical solution of this utility model is that a displacement sensor is also installed on the movable support; the signal output terminal of the displacement sensor is electrically connected to the signal input terminal of the controller.

[0013] A further technical solution of this utility model is that the inner wall of the nut is provided with a wear-resistant coating, which is a polytetrafluoroethylene-bronze composite coating with a thickness of 0.1-0.2mm.

[0014] A further technical solution of this utility model is that the testing machine also includes a protective component, which includes an accordion-style retractable protective cover and a fixed protective cover. The fixed protective cover is installed on the outside of the variable frequency motor. One end of the accordion-style retractable protective cover is connected to the movable support, and the other end is connected to the fixed protective cover. The accordion-style retractable protective cover is installed on the outside of the lead screw transmission mechanism. The inner side of the accordion-style retractable protective cover is provided with a brush along the length of the lead screw for cleaning impurities on the surface of the lead screw as it extends and retracts with the movable support.

[0015] A further technical solution of this utility model is that the controller is provided with a display unit, which is used to synchronously display the motor frequency, displacement and pressure / tension data, so as to facilitate real-time monitoring of the test status.

[0016] A further technical solution of this utility model is that the controller panel is provided with a "1# Machine Compression" button, a "1# Machine Stop" button, a "1# Machine Stretch" button, a "Dual Machine Compression" button, a "Dual Machine Stop" button, a "Dual Machine Stretch" button, a "2# Machine Compression" button, a "2# Machine Stop" button, a "2# Machine Stretch" button, and an "Emergency Stop" button.

[0017] A further technical solution of this utility model is that the bottom of the test bench is equipped with height-adjustable wheels for moving the test bench and calibrating its level.

[0018] Due to the above-mentioned structure, the high-precision bridge expansion joint testing machine of this invention has the following advantages compared with the prior art: 1. It can improve the accuracy of the test and ensure the accuracy of the test results. This invention automatically controls the output frequency of two variable frequency motors to maintain consistency through a controller, eliminating the need for manual adjustment, avoiding data distortion caused by frequency inconsistency, improving test accuracy, and simplifying the operation process.

[0019] In addition, by setting a positioning groove, clamping bolts, clamping springs, pressure regulating motors, and pressure sensors on the clamping platform, this utility model can not only achieve rapid positioning of expansion joint samples, but also prevent the samples from shifting during the test through the elastic force of the clamping springs, thus significantly improving clamping stability and positioning accuracy and ensuring accurate test results.

[0020] Furthermore, this invention uses displacement and pressure sensors to collect real-time data on expansion and contraction displacement and force, and transmits this data to the controller, allowing operators to promptly grasp the experimental situation and providing accurate data support for experimental analysis.

[0021] Furthermore, this utility model has a dovetail groove at the bottom of the slider, which slides in cooperation with the guide rail on the top surface of the test bench, so that the movable support will not tilt due to the eccentric bending moment caused by the weight of the expansion joint, thereby ensuring the horizontal accuracy of the support.

[0022] 2. Stable structure, not easily deformed, and easy to operate. Because bridge expansion joint samples weigh approximately 0.6 to 1.0 tons, their weight is relatively large. This invention uses an integrated hook to connect the expansion joint sample to the hanging beam. Compared to assembled hooks, the integrated hook structure used in this invention is stable, less prone to deformation, requires minimal adjustment, and is convenient and efficient for testing.

[0023] 3. Can avoid freezing. This invention uses a controller to automatically keep the output frequency of two variable frequency motors consistent, which can avoid the problem of the two motors jamming when they are not synchronized.

[0024] 4. Reliable protection: This utility model adopts an accordion-style retractable protective cover, which is linked with the movable support. It can fully cover the screw drive mechanism, effectively blocking impurities such as iron filings from entering. It is flexible in extension and retraction, will not jam, and extends the service life of the equipment.

[0025] 5. Reasonable structure This invention features adjustable-height wheels installed at the bottom of the test bench for moving and leveling the test bench, and its structure is quite reasonable.

[0026] The technical features of the high-precision bridge expansion joint testing machine of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0027] Figure 1 : A schematic diagram of the structure of the high-precision bridge expansion joint testing machine of this utility model. Figure 2 Schematic diagram (front view) of the fixed support structure with clamping mechanism installed as described in Embodiment 1. Figure 3 : Figure 2 Left view, Figure 4 : Schematic diagram of the movable support structure equipped with a clamping mechanism as described in Embodiment 1 Figure 5 : A schematic diagram of the button layout on the controller panel described in Embodiment 1 Figure 6 : A schematic diagram of the integrated hook described in Embodiment 1; In the above figures, the reference numerals are explained as follows: 1-Test bench, 101-Guide rail, 102-Walking wheel, 2-Fixed support 3-Modible support, 301-Slider, 3011-Dovetail groove, 4-Screw drive mechanism, 401-Drive screw drive mechanism. 5-Drive system, 501-Variable frequency motor, 6-Controller, 601-"Compressor #1" button, 602-"Stop Machine #1" button 603 - "No. 1 Machine Stretching" button, 604 - "Dual Machine Compression" button, 605 - "Dual Machine Stop" button. 606 - "Dual-machine stretching" button, 607 - "Machine #2 compression" button, 608 - "Machine #2 stop" button. 609 - "Stretching Machine #2" button, 610 - "Emergency Stop" button. 7-Clamping mechanism, 701-Clamping platform, 7011-Positioning groove, 702-Clamping bolt, 703 - Compression spring, 704 - Pressure regulating motor, 705 - Pressure sensor 8-Protective components, 801-Bellboard-style retractable protective cover, 802-Fixed protective cover, 9-Hanging beam, 901-Integrated hook, 9011-T-slot, 9012-Open slot. Detailed Implementation Example 1

[0028] A high-precision bridge expansion joint testing machine includes a test bench 1, a fixed support 2, a movable support 3, a screw transmission mechanism 4, a drive system 5, a controller 6, a clamping mechanism 7, a protective assembly 8, and a hanging beam 9; wherein: The test bench 1 is equipped with a guide rail 101 on its top surface and adjustable wheels 102 on its bottom surface for moving and leveling the test bench 1.

[0029] The fixed support 2 is fixed to one end of the test bench 1. The bottom of the movable support 3 is fixedly connected to a slider 301. The bottom of the slider 301 is provided with a dovetail groove 3011. The dovetail groove 3011 slides with the guide rail 101 on the top surface of the test bench 1. A displacement sensor is also installed on the movable support 3. The signal output terminal of the displacement sensor is electrically connected to the signal input terminal of the controller 6. The lead screw transmission mechanism 4 includes a drive drive lead screw 401 and a nut that mesh with each other. The nut is fixedly installed in the movable support 3. One end of the drive drive lead screw 401 is installed in the fixed support 2, and the other end of the drive drive lead screw 401 passes through the nut and is threaded into the nut. The inner wall of the nut is provided with a wear-resistant coating, which is a polytetrafluoroethylene-bronze composite coating with a thickness of 0.1-0.2 mm.

[0030] The drive system 5 includes two variable frequency motors 501. The output shaft of each variable frequency motor 501 is connected to the active transmission screw 401 of the corresponding work position screw transmission mechanism 4, and is used to drive the movable support 3 to move along the axial direction of the active transmission screw 401. The controller 6 is fixed to one side of the test bench 1 and electrically connected to the signal input terminals of the two variable frequency motors 501. It is used to control the forward and reverse rotation of the variable frequency motors 501 to drive the movable support 3 to achieve compression and tension actions. The controller 6 is equipped with a display unit, which is used to synchronously display the motor frequency, displacement, and pressure / tension data for easy real-time monitoring of the test status. The controller 6 has a panel equipped with a "Compressor #1" button 601, a "Stop #1" button 602, a "Stretch #1" button 603, a "Dual-Machine Compressor" button 604, a "Dual-Machine Stop" button 605, a "Dual-Machine Stretcher" button 606, a "Compressor #2" button 607, a "Stop #2" button 608, a "Stretch #2" button 609, and an "Emergency Stop" button 610. These buttons are used to manually control the two variable frequency motors 501 to rotate forward, stop, or reverse, thereby driving the movable support 3 to perform compression and stretching actions. For example, when "Compressor #1" is pressed, the variable frequency motor 501 rotates forward, driving the movable support 3 to perform compression; when "Stretch #1" is pressed, the variable frequency motor 501 rotates in reverse, driving the movable support 3 to perform stretching.

[0031] The clamping mechanism 7 is symmetrically installed on the top of the fixed support 2 and the movable support 3 for fixing the hanging beam 9. The clamping mechanism 7 includes a clamping platform 701 with a positioning groove 7011, a clamping bolt 702, a clamping spring 703, a pressure regulating motor 704, and a pressure sensor 705. The clamping platform 701 is fixedly installed on the top of the fixed support 2 and the movable support 3 respectively. The positioning grooves 7011 of the two clamping platforms 701 face each other for installing the hanging beam 9. The clamping bolt 702 is installed on the top of the clamping platform 701. The clamping spring 703 and the pressure sensor 705 are sleeved on the clamping bolt 702. The signal output terminal of the pressure sensor 705 is electrically connected to the signal input terminal of the controller 6. The signal output terminal of the controller 6 is electrically connected to the signal input terminal of the pressure regulating motor 704. The output shaft of the pressure regulating motor 704 is connected to the clamping bolt 702.

[0032] The protective component 8 includes a bellows-style retractable protective cover 801 and a fixed protective cover 802. The fixed protective cover 802 is installed on the outside of the variable frequency motor 5. One end of the bellows-style retractable protective cover 801 is connected to the movable support 3, and the other end is connected to the fixed protective cover 802. The bellows-style retractable protective cover 801 is installed on the outside of the lead screw transmission mechanism 4. The inner side of the bellows-style retractable protective cover 801 is provided with a brush along the length of the active transmission lead screw for cleaning impurities on the surface of the lead screw as it extends and retracts with the movable support 3.

[0033] The hanging beam 9 consists of two parallel longitudinal beams, which are connected to the expansion joint sample via an integrated hook 901. One end of the integrated hook 901 has a T-shaped groove 9011 that mates with the hanging beam 9, and the other end has an opening groove 9012 for mounting the expansion joint sample. The integrated hook structure used in this invention is stable, not easily deformed, requires minimal adjustment, and is convenient and efficient for testing.

Claims

1. A high-precision bridge expansion joint testing machine, comprising a test bench (1), characterized in that, It also includes a fixed support (2), a movable support (3), a screw drive mechanism (4), a drive system (5), a controller (6), and a hanging beam (9); the fixed support (2) is fixed on the test bench (1), and the bottom of the movable support (3) is mounted on the guide rail (10) on the top surface of the test bench (1) via a slider (301); the top of the fixed support (2) and the movable support (3) are respectively equipped with clamping mechanisms (7) for fixing the hanging beam (9), and the screw drive mechanism (4) includes a meshing active drive screw (401) and a nut, with the nut fixedly installed on the movable support (3). The drive system (5) includes two variable frequency motors (501), the output end of each variable frequency motor (501) is connected to the active transmission screw of the corresponding work position screw transmission mechanism (4) to drive the moving support (3) to move axially along the active transmission screw (401); the controller (6) is fixed on one side of the test bench (1) and electrically connected to the two variable frequency motors (501) to control the variable frequency motors (501) to rotate forward and backward to drive the moving support (3) to achieve compression and tension actions; the hanging beam (9) is connected to the expansion joint sample through an integrated hook (901).

2. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, The clamping mechanism (7) includes a clamping platform (701) with a positioning groove (7011), a clamping bolt (702), a clamping spring (703), a pressure regulating motor (704), and a pressure sensor (705). The clamping platform (701) is fixedly installed on the top of the fixed support (2) and the movable support (3), respectively. The positioning grooves (7011) of the two clamping platforms (701) face each other. The clamping bolt (702) is installed on the top of the clamping platform (701). The clamping spring (703) and the pressure sensor (705) are sleeved on the clamping bolt (702). The signal output end of the pressure sensor (705) is electrically connected to the signal input end of the controller (6). The signal output end of the controller (6) is electrically connected to the signal input end of the pressure regulating motor (704). The output shaft of the pressure regulating motor (704) is connected to the clamping bolt (702).

3. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, The hanging beam (9) consists of two parallel longitudinal beams; one side of the integrated hook (901) has a T-shaped groove (9011) that connects with the hanging beam (9), and the top surface of the other end of the integrated hook (901) has an opening groove (9012) for installing expansion joint samples.

4. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, The bottom of the slider (301) is provided with a dovetail groove (3011), which slides in cooperation with the guide rail (10).

5. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, A displacement sensor is also installed on the movable support (3); the signal output terminal of the displacement sensor is electrically connected to the signal input terminal of the controller (6).

6. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, The inner wall of the nut is provided with a wear-resistant coating, which is a polytetrafluoroethylene-bronze composite coating with a thickness of 0.1-0.2 mm.

7. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, The testing machine also includes a protective component (8), which includes a bellows-type retractable protective cover (801) and a fixed protective cover (802). The fixed protective cover (802) is installed on the outside of the variable frequency motor (501). One end of the bellows-type retractable protective cover (801) is connected to the movable support (3), and the other end is connected to the fixed protective cover (802). The bellows-type retractable protective cover (801) is installed on the outside of the screw drive mechanism (4). The inner side of the bellows-type retractable protective cover (801) is provided with a brush along the length of the screw for cleaning impurities on the screw surface as the movable support (3) extends and retracts.

8. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, The controller (6) is equipped with a display unit, which is used to synchronously display the motor frequency, displacement and pressure / tension data, so as to facilitate real-time monitoring of the test status.

9. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, The controller (6) panel is equipped with a "1# Machine Compression" button (601), a "1# Machine Stop" button (602), a "1# Machine Stretch" button (603), a "Dual Machine Compression" button (604), a "Dual Machine Stop" button (605), a "Dual Machine Stretch" button (606), a "2# Machine Compression" button (607), a "2# Machine Stop" button (608), a "2# Machine Stretch" button (609), and an "Emergency Stop" button (610).

10. The high-precision bridge expansion joint testing machine according to claim 1, characterized in that, The test bench (1) is equipped with adjustable height wheels (101) at the bottom for moving and leveling the test bench (1).

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