A manhole cover pressure testing device

Abstract

The utility model relates to the technical field of manhole cover pressure test, concretely is a kind of manhole cover pressure test device, including base, hydraulic cylinder mounting plate, stand, hydraulic cylinder, round pressure head, first ear plate, arc pressure head, protective plate, protective door, right-angle clamping plate, measuring assembly, sensor slot, sliding slot, second ear plate, threaded column, sensor mounting plate, displacement sensor, handle and fixed plate;The utility model is through setting detachable arc pressure head, the arc surface of arc pressure head can simulate the contact state of vehicle and manhole cover, the maximum pressure-bearing data of manhole cover is measured by exerting pressure to be most close to the maximum pressure-bearing data of real use scene, compared with single round pressure head test, can more accurate measurement manhole cover pressure-bearing data, measuring assembly adopts sliding pull type structure, the dismounting of displacement sensor is convenient, is favorable to later calibration and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover pressure testing technology, specifically a manhole cover pressure testing device. Background Technology

[0002] As an important component of urban road and other infrastructure, manhole covers need to have sufficient pressure-bearing capacity to withstand the pressure of vehicles. To ensure the quality of manhole covers, pressure tests are conducted on batches of products during the production process to detect performance changes under certain pressure, ensuring safety in subsequent use. This requires a manhole cover pressure testing machine, which mainly consists of a pressure actuator and a sensor detection system, such as the manhole cover pressure testing machine with positioning device disclosed in CN222364841U. Currently, the pressure actuators of existing manhole cover pressure testing machines mostly use a single circular indenter for pressure testing, which is difficult to simulate the actual working conditions of the arc-shaped contact between vehicle tires and manhole covers. Since the smaller the contact area, the greater the pressure, the structure tested using a circular indenter deviates from the real scenario. Furthermore, the sensors used in existing pressure testing machines to detect the deformation of manhole covers are often fixed, making disassembly and maintenance cumbersome and hindering subsequent calibration. In addition, the protective structure of the device is mostly fixed, limiting the operating space when placing and adjusting the position of the manhole cover, affecting testing efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a manhole cover pressure testing device to solve the aforementioned technical problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a manhole cover pressure testing device, comprising a base, a hydraulic cylinder mounting plate, and columns. Columns are fixedly connected to the four corners of the bottom surface of the hydraulic cylinder mounting plate, and the bottom ends of the columns are fixedly connected to the corners of the top surface of the base. A hydraulic cylinder is vertically fixedly installed at the center of the bottom surface of the hydraulic cylinder mounting plate. A circular pressure head is installed at the output end of the hydraulic cylinder. An arc-shaped pressure head is detachably provided at the bottom of the circular pressure head. A first ear plate is fixedly connected to the outer wall of the circular pressure head. Second ear plates are fixedly connected to both ends of the arc-shaped pressure head. A threaded column is vertically fixedly connected to the top surface of the second ear plate. A through hole is opened on the first ear plate, and the threaded column slides through the through hole of the first ear plate and is fixed by a nut.

[0005] The top and bottom of one side of the column are fixedly connected with right-angle plates. The two right-angle plates are mirror images of each other. The right-angle plates and the column form a slot. The column also includes a protective plate, which is slidably engaged in the slot formed by the right-angle plates and the column. The base has a sensor slot on its top surface, which is located directly below the hydraulic cylinder. A sliding groove communicating with the sensor slot is horizontally opened on one side of the base. A measuring component is installed in the sliding groove. The measuring component includes a sensor mounting plate and a displacement sensor. The displacement sensor is fixedly installed at the top of one end of the sensor mounting plate. The sensor mounting plate is slidably disposed in the sliding groove. A handle and a fixing plate are fixedly connected to the end of the sensor mounting plate away from the displacement sensor. A through hole is opened on the fixing plate. After the sensor mounting plate is installed in the sliding groove, the fixing plate is fixed to the base by bolts. After the fixing plate is fixed by bolts, the displacement sensor is located at the center of the sensor slot. Preferably, the middle part of one side of the base has an arc-shaped structure, and the two columns near the arc-shaped structure of the base are hinged with protective doors. The protective doors are equipped with bolt locks. Multiple through slots are opened on both the protective doors and the protective plate. The top surface of the base is fixedly connected with support legs.

[0006] Preferably, the diameter of the through hole in the first ear plate is 1mm-3mm larger than the diameter of the threaded post.

[0007] Preferably, the displacement sensor is a non-contact displacement sensor.

[0008] Preferably, the protective door is hinged to the column via hinges.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention features a cleverly designed structure. By incorporating a detachable arc-shaped pressure head, the arc surface of which simulates the contact between a vehicle and a manhole cover, the maximum pressure bearing capacity of the manhole cover is measured using pressure. This measurement provides a more accurate measurement of the manhole cover's pressure bearing capacity compared to a single circular pressure head test. The measuring components employ a sliding pull-out structure, facilitating the installation and removal of the displacement sensor and aiding in subsequent calibration and maintenance. The protective plate uses a sliding snap-fit ​​method, making installation and removal convenient. After removal, personnel can place and adjust the manhole cover from multiple positions on the device, facilitating testing operations. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a rear-view three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the protective plate and the arc-shaped pressure head of this utility model when they are not installed; Figure 4 This is a schematic diagram of the measuring component structure of this utility model; Figure 5 This is a schematic diagram of the arc-shaped pressure head structure of this utility model.

[0011] In the diagram: 1. Base; 2. Hydraulic cylinder mounting plate; 3. Column; 4. Hydraulic cylinder; 5. Circular pressure head; 51. First ear plate; 6. Arc-shaped pressure head; 7. Protective plate; 8. Protective door; 9. Right-angle clamping plate; 10. Measuring component; 1a. Sensor slot; 1b. Slide groove; 61. Second ear plate; 62. Threaded column; 101. Sensor mounting plate; 102. Displacement sensor; 103. Handle; 104. Fixing plate. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0013] Please see Figures 1 to 4 The present invention provides a technical solution: a manhole cover pressure testing device, comprising a base 1, a hydraulic cylinder mounting plate 2, and a column 3. The column 3 is fixedly connected to the four corners of the bottom surface of the hydraulic cylinder mounting plate 2. The bottom end of the column 3 is fixed to the corner of the top surface of the base 1 to provide stable support for the hydraulic cylinder mounting plate 2. A hydraulic cylinder 4 is vertically fixed at the center of the bottom surface of the hydraulic cylinder mounting plate 2. A circular pressure head 5 is installed at the output end of the hydraulic cylinder 4. The hydraulic cylinder 4 can drive the circular pressure head 5 to move up and down to apply pressure.

[0014] A first ear plate 51 is fixed to the outer wall of a circular pressure head 5, and second ear plates 61 are fixed to both ends of an arc-shaped pressure head 6. A threaded post 62 is vertically fixed to the top surface of the second ear plate 61. The first ear plate 51 has a through hole, through which the threaded post 62 slides and is fixed with a nut. The diameter of the through hole in the first ear plate 51 is 2mm larger than the diameter of the threaded post 62. This design facilitates quick assembly and disassembly of the arc-shaped pressure head 6, and the reserved gap can accommodate assembly errors. The arc-shaped pressure head 6 can simulate the arc-shaped contact between a vehicle tire and a manhole cover, improving the simulation accuracy of the working conditions and more realistically simulating and measuring the stress scenario of the manhole cover.

[0015] As a further embodiment of this utility model, right-angled clamping plates 9 are fixed at the top and bottom of one side of the column 3, and the protective plate 7 is slidably clamped in the groove formed by the right-angled clamping plate 9 and the column 3. It is easy to disassemble and assemble. After removing the protective plate 7, it can be operated from multiple directions, which is convenient for placing and adjusting the position of the manhole cover.

[0016] As a further embodiment of this utility model, a sensor groove 1a is formed on the top surface of the base 1, located directly below the hydraulic cylinder 4, for the sensor 102 to receive deformation data of the manhole cover. A horizontal sliding groove 1b communicating with the sensor groove 1a is formed on one side of the base 1. A measuring component 10 is installed in the sliding groove 1b, which includes a sensor mounting plate 101 and a displacement sensor 102. The sensor mounting plate 101 is slidably disposed in the sliding groove 1b, and a handle 103 and a fixing plate 104 are fixed to the end away from the displacement sensor 102. After the sensor mounting plate 101 is inserted into the sliding groove 1b, the fixing plate 104 is fixed to the base 1 by bolts, and after fixing, the displacement sensor 102 is located at the center of the sensor groove 1a. The displacement sensor 102 can be quickly disassembled and assembled by pulling the sensor mounting plate 101, which facilitates subsequent calibration and maintenance.

[0017] As a further embodiment of this utility model, the middle part of one side of the base 1 is an arc-shaped structure, which facilitates the removal and placement of the manhole cover. The two columns 3 near the arc-shaped structure are hinged with protective doors 8. The protective doors 8 are equipped with bolt locks, which can be locked after closing. The protective doors 8 and the protective plate 7 enclose the test space, which has both a protective effect and facilitates the observation of the test situation.

[0018] Working principle: When in use, open the protective door 8, place the manhole cover to be tested above the sensor slot 1a of the base 1, close the protective door 8 and lock it with the latch, start the hydraulic cylinder 4 to drive the circular pressure head 5 to move downward and contact the manhole cover and apply pressure, and the displacement sensor 102 detects the deformation of the manhole cover in real time. If simulating the vehicle rolling condition, pass the threaded post 62 of the arc-shaped pressure head 6 through the through hole of the first ear plate 51 on the circular pressure head 5, tighten the nut, and complete the connection between the arc-shaped pressure head 6 and the circular pressure head 5. Start the hydraulic cylinder 4 to drive the circular pressure head 5 and the arc-shaped pressure head 6 to move downward. The arc-shaped pressure head 6 contacts the manhole cover and applies pressure. The displacement sensor 102 detects the deformation of the manhole cover in real time. The detachable arc-shaped pressure head 6 is set. The arc surface of the arc-shaped pressure head 6 can simulate the contact state between the vehicle and the manhole cover. Compared with the single circular pressure head test, it can measure the pressure data of the manhole cover more accurately.

[0019] If the displacement sensor 102 needs to be sent to a professional calibration structure for calibration or maintenance, unscrew the bolts on the fixing plate 104, pull the sensor mounting plate 101 with the handle 103, and the displacement sensor 102 can be taken out from the slide groove 1b. After maintenance, reinstall it in reverse order.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A manhole cover pressure testing device, comprising a base (1), a hydraulic cylinder mounting plate (2), and a column (3), wherein the column (3) is fixedly connected to the four corners of the bottom surface of the hydraulic cylinder mounting plate (2), the bottom end of the column (3) is fixedly connected to the corner of the top surface of the base (1), and a hydraulic cylinder (4) is vertically fixedly installed at the center of the bottom surface of the hydraulic cylinder mounting plate (2), and a circular pressure head (5) is installed at the output end of the hydraulic cylinder (4), characterized in that: The circular pressure head (5) is detachably equipped with an arc-shaped pressure head (6) at the bottom. The top and bottom of one side of the column (3) are fixedly connected with right-angle plates (9). The groove formed by the right-angle plates (9) and the column (3) also includes a protective plate (7). The protective plate (7) is slidably engaged in the groove formed by the right-angle plates (9) and the column (3). The top surface of the base (1) is provided with a sensor groove (1a). The sensor groove (1a) is located directly below the hydraulic cylinder (4). A sliding groove (1b) communicating with the sensor groove (1a) is horizontally provided on one side of the base (1). A measuring component (10) is installed in the sliding groove (1b). The middle part of one side of the base (1) is an arc-shaped structure.

2. The manhole cover pressure testing device according to claim 1, characterized in that: The outer wall of the circular pressure head (5) is fixedly connected to a first ear plate (51), and the two ends of the arc-shaped pressure head (6) are fixedly connected to a second ear plate (61). A threaded column (62) is vertically fixedly connected to the top surface of the second ear plate (61). A through hole is opened on the first ear plate (51), and the threaded column (62) slides through the through hole of the first ear plate (51) and is fixed by a nut.

3. The manhole cover pressure testing device according to claim 2, characterized in that: The diameter of the through hole of the first ear plate (51) is 1mm-3mm larger than the diameter of the threaded post (62).

4. The manhole cover pressure testing device according to claim 1, characterized in that: The measuring component (10) includes a sensor mounting plate (101) and a displacement sensor (102). The displacement sensor (102) is fixedly mounted on the top of one end of the sensor mounting plate (101). The sensor mounting plate (101) is slidably disposed in the slide groove (1b). A handle (103) and a fixing plate (104) are fixedly connected to the end of the sensor mounting plate (101) away from the displacement sensor (102). A through hole is provided on the fixing plate (104).

5. The manhole cover pressure testing device according to claim 4, characterized in that: After the sensor mounting plate (101) is installed in the slide groove (1b), the fixing plate (104) is fixed to the base (1) by bolts, and after the fixing plate (104) is fixed by bolts, the displacement sensor (102) is located at the center of the sensor groove (1a).

6. The manhole cover pressure testing device according to claim 1, characterized in that: Two columns (3) on the side of the arc-shaped structure near the base (1) are hinged with protective doors (8). The protective doors (8) are equipped with bolt locks. Multiple through slots are opened on the protective doors (8) and the protective plate (7). The top surface of the base (1) is fixedly connected with support legs.

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