Clamping structure of pressure test equipment

Abstract

The utility model relates to the technical field of clamping of test equipment, in particular to a clamping structure of pressure test equipment. The pressure test equipment clamping structure comprises a fixing disc, a clamping cylinder which is coaxially arranged is fixedly installed on the fixing disc, an elastic air bag is installed in an inner cavity of the clamping cylinder, an elastic air storage cushion is installed on the outer cylinder wall of the clamping cylinder, and an air compression assembly is installed on the clamping cylinder. According to the clamping structure of the pressure testing equipment, the elastic air bag wraps most of the rock core cylinder, the clamping area of the rock core cylinder is greatly increased, the rock core cylinder is more stable, when the rock core cylinder is fractured, the elastic air bag can not only relieve the impact force of crack residues on the clamping cylinder, but also store the crack residues, and therefore the clamping structure of the pressure testing equipment is convenient to use. And the elastic air bag absorbs impact and stores the cracking slag, and is matched with the elastic telescopic protective cover to form two defensive lines, so that the problem of splashing of the cracking slag is thoroughly solved.

Description

Technical Field

[0001] This utility model relates to the field of test equipment clamping technology, and in particular to a pressure test equipment clamping structure. Background Technology

[0002] In oil and gas experiments, core samples need to be tested for mechanical strength using pressure equipment (such as hydraulic cylinders) to obtain key mechanical parameters of the reservoir rock. Core samples are obtained by drilling, cutting, and grinding the cores into standard cylinders (e.g., 1 inch in diameter and 2-2.5 times the diameter in length). The experiment is usually carried out on a rock mechanics testing machine. The core part of this equipment is the axial hydraulic cylinder (some of which include confining pressure hydraulic cylinders) controlled by a hydraulic servo system. However, the clamping method used on rock mechanics testing machines is mostly rigid clamping arms or mechanical chucks to fix the core samples. Therefore, when the core is fractured, the fracture debris is easily scattered, threatening the safety of the operators. In addition, the clamping area of ​​the clamping arms or mechanical chucks is small, which can easily lead to low accuracy of the core sample pressure test due to uneven stress on the core.

[0003] Therefore, it is necessary to provide a new clamping structure for pressure testing equipment to solve the above-mentioned technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a clamping structure for a pressure testing device.

[0005] The pressure testing equipment clamping structure provided by this utility model includes a fixed plate, on which a clamping cylinder is fixedly installed coaxially, and an elastic air bladder is installed in the inner cavity of the clamping cylinder. Several annularly distributed elastic air storage pads are installed on the outer wall of the clamping cylinder, and the elastic air storage pads and the elastic air bladder are interconnected through a conduit.

[0006] The clamping cylinder is equipped with a compression component for compressing the elastic air storage pad and driving the gas inside the elastic air storage pad to be discharged into the elastic air bladder.

[0007] An elastic telescopic protective cover is also fixedly installed on the fixed plate, and the elastic telescopic protective cover is located around the clamping cylinder.

[0008] Preferably, the elastic airbag is installed in the inner annular groove of the clamping cylinder, and the outer surface of the elastic airbag is fixedly connected to the inner wall of the inner annular groove.

[0009] Preferably, the outer wall of the clamping cylinder has several annularly distributed and axially arranged grooves, and each groove is equipped with an elastic air storage pad. The top surface of the elastic air storage pad is fixedly connected to the inner top wall of the groove, and a conduit communicating with the elastic air bag is installed on the pad near the top of the elastic air storage pad.

[0010] Preferably, the air compression assembly includes a threaded ring, which is sleeved on the threaded portion provided on the outer wall of the clamping cylinder and threadedly connected to the threaded portion. The threaded portion is located on the clamping cylinder above the groove. A rotating ring is rotatably connected to the outer ring surface of the threaded ring, and several L-shaped frames distributed in annularly are fixedly installed on the rotating ring.

[0011] Preferably, the L-shaped frame corresponds one-to-one with the slot, and the horizontal plate at the bottom of the L-shaped frame is inserted into the slot and fixedly connected to the lower surface of the elastic air storage pad.

[0012] Preferably, the clamping cylinder has multiple annularly distributed threaded through holes near the top opening, and each threaded through hole is fitted with a threaded fastening screw.

[0013] Preferably, a pull ring is fixedly installed on the top of the elastic telescopic protective cover.

[0014] Compared with related technologies, the clamping structure for the pressure testing equipment provided by this utility model has the following advantages:

[0015] This invention significantly increases the clamping area of ​​the core cylinder by covering most of it with an elastic airbag, making it more stable. When the core cylinder is fractured, the elastic airbag can not only alleviate the impact of the fracture debris on the clamping cylinder, but also collect the debris. Compared with the traditional clamping arm of the rock mechanics testing machine, this application can effectively avoid the safety hazards caused by the splashing of fracture debris when the core cylinder is fractured. The elastic airbag absorbs the impact and collects the fracture debris, forming two lines of defense with the elastic telescopic protective cover, further reducing the problem of debris splashing. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the clamping structure for the pressure testing equipment provided by this utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the mounting structure of the clamping cylinder on the fixed plate;

[0018] Figure 3 for Figure 2 A cross-sectional view of the clamping cylinder shown.

[0019] Figure 4 for Figure 2 The diagram shows the structure of the elastic air storage cushion.

[0020] Figure 5 for Figure 2 The diagram shows the structure of the air compressor assembly.

[0021] The following are the labels in the diagram: 1. Fixed plate; 2. Clamping cylinder; 2a. Inner ring groove; 2b. Cut groove; 2c. Threaded through hole; 21. Threaded part; 3. Elastic air bag; 4. Elastic air storage pad; 5. Compressed air assembly; 51. Threaded ring; 52. Rotating ring; 53. L-shaped frame; 6. Fastening screw; 7. Elastic telescopic protective cover; 71. Pull ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0024] Please see Figures 1 to 5 The present invention provides a pressure testing equipment clamping structure, which includes a fixed plate 1, a clamping cylinder 2, an elastic air bladder 3, an elastic air storage pad 4, and an air compression component 5.

[0025] In the embodiments of this utility model, please refer to Figures 1 to 5 A clamping cylinder 2 is fixedly mounted on the fixed plate 1, and an elastic airbag 3 is installed in the inner cavity of the clamping cylinder 2. Several annularly distributed elastic air-storing pads 4 are installed on the outer wall of the clamping cylinder 2, and the elastic air-storing pads 4 and the elastic airbag 3 are interconnected through conduits. Specifically:

[0026] The elastic airbag 3 is installed in the inner annular groove 2a of the clamping cylinder 2, and the outer surface of the elastic airbag 3 is fixedly connected to the inner wall of the inner annular groove 2a. The outer wall of the clamping cylinder 2 is provided with several annularly distributed and axially arranged grooves 2b, and each groove 2b is equipped with an elastic air storage pad 4. The top surface of the elastic air storage pad 4 is fixedly connected to the inner top wall of the groove 2b, and a conduit communicating with the elastic airbag 3 is installed on the pad near the top of the elastic air storage pad 4.

[0027] The clamping cylinder 2 is equipped with a compression component 5 for compressing the elastic air storage cushion 4 and driving the gas inside the elastic air storage cushion 4 to be discharged into the elastic air bag 3.

[0028] It should be noted that: the fixed plate 1 is installed on the pressure plate below the rock mechanics testing machine, and then the prepared rock core cylinder is inserted into the clamping cylinder 2 (the rock core cylinder is slightly higher than the clamping cylinder 2). The bottom of the rock core cylinder is kept against the pressure plate below the rock mechanics testing machine. Then, the gas in the elastic gas storage pad 4 is injected into the elastic air bladder 3 by the air compression component 5, so that the elastic air bladder 3 expands and quickly presses the rock core cylinder, thereby achieving a firm clamping of the rock core cylinder.

[0029] It should also be noted that: since the elastic airbag 3 covers most of the core cylinder, the clamping area of ​​the core cylinder is greatly increased, making it more stable. When the core cylinder is fractured, the elastic airbag 3 can not only alleviate the impact of the fracture debris on the clamping cylinder 2, but also collect the fracture debris. Compared with the traditional clamping arm of the rock mechanics testing machine, this application can effectively avoid the safety hazards caused by the splashing of fracture debris when the core cylinder is fractured. At the same time, since the elastic airbag 3 covers most of the core cylinder, the clamping of the core cylinder is more stable.

[0030] Among them, because the elastic airbag 3 has elasticity, it can adapt to rock core cylinders of different diameters.

[0031] Furthermore, to avoid the problem of easy wear and tear of the elastic airbag 3 after long-term use, an aramid fiber reinforcement layer can be provided inside the elastic airbag 3.

[0032] In the embodiments of this utility model, please refer to Figures 1 to 5 The compressed air assembly 5 includes a threaded ring 51, which is sleeved on the threaded portion 21 provided on the outer wall of the clamping cylinder 2 and threadedly connected to the threaded portion 21. The threaded portion 21 is located on the clamping cylinder 2 above the groove 2b. A rotating ring 52 is rotatably connected to the outer ring surface of the threaded ring 51. Several L-shaped frames 53 are fixedly installed on the rotating ring 52. The L-shaped frames 53 correspond one-to-one with the groove 2b. The horizontal plate at the bottom of the L-shaped frame 53 is inserted into the groove 2b and fixedly connected to the lower pad surface of the elastic air storage pad 4.

[0033] It should be noted that: when the threaded ring 51 is rotated upwards towards the threaded portion 21, the threaded ring 51 drives the L-shaped frame 53 to rise. Therefore, the L-shaped frame 53 compresses the elastic air storage pad 4 and causes the gas in the elastic air storage pad 4 to be discharged into the elastic air bladder 3. As a result, the elastic air bladder 3 expands. When the clamping force is released, the reverse threaded ring 51 drives the threaded ring 51 to rotate downwards along the threaded portion 21. As a result, the elastic air storage pad 4 is stretched and the gas in the elastic air bladder 3 flows back into the elastic air storage pad 4. Therefore, the elastic air bladder 3 no longer clamps the core cylinder.

[0034] In this embodiment, since the elastic air storage pad 4 is restricted by the groove 2b and the vertical plate of the L-shaped frame 53, when the elastic air storage pad 4 is compressed, there will be no risk of the elastic air storage pad 4 shifting to the side.

[0035] The clamping cylinder 2 has multiple annularly distributed threaded through holes 2c near the top opening, and each threaded through hole 2c is fitted with a threaded fastening screw 6. After the core cylinder is clamped and fixed by the elastic airbag 3, the fastening screw 6 can be tightened to clamp the core cylinder located at the opening of the clamping cylinder 2, thereby further improving the clamping and fixing of the core cylinder.

[0036] In the embodiments of this utility model, please refer to Figures 1 to 5 An elastic telescopic protective cover 7 is also fixedly installed on the fixed plate 1, and the elastic telescopic protective cover 7 is located around the clamping cylinder 2, while a pull ring 71 is fixedly installed on the top of the elastic telescopic protective cover 7.

[0037] It should be noted that after the core cylinder is clamped in the clamping cylinder 2, the upper pull ring 71 drives the elastic telescopic protective cover 7 to be stretched. Therefore, the elastic airbag 3 absorbs the impact and collects the crack debris, forming two lines of defense with the elastic telescopic protective cover 7, further reducing the problem of crack debris splashing.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A clamping structure for a pressure testing device, characterized in that, Includes a fixed plate (1), on which a clamping cylinder (2) is fixedly installed on the fixed plate (1) and an elastic airbag (3) is installed in the inner cavity of the clamping cylinder (2). Several annularly distributed elastic air storage pads (4) are installed on the outer wall of the clamping cylinder (2), and the elastic air storage pads (4) and the elastic airbag (3) are interconnected through a conduit. The clamping cylinder (2) is equipped with a compression assembly (5) for compressing the elastic air storage cushion (4) to drive the gas in the elastic air storage cushion (4) to the elastic air bag (3). An elastic telescopic protective cover (7) is also fixedly installed on the fixed plate (1), and the elastic telescopic protective cover (7) is located around the clamping cylinder (2).

2. The clamping structure for the pressure testing equipment according to claim 1, characterized in that, The elastic airbag (3) is installed in the inner ring groove (2a) of the clamping cylinder (2), and the outer surface of the elastic airbag (3) is fixedly connected to the inner wall of the inner ring groove (2a).

3. The clamping structure for the pressure testing equipment according to claim 2, characterized in that, The outer wall of the clamping cylinder (2) is provided with several annularly distributed and axially arranged grooves (2b), and each groove (2b) is equipped with an elastic air storage pad (4). The top surface of the elastic air storage pad (4) is fixedly connected to the inner top wall of the groove (2b), and a conduit communicating with the elastic air bag (3) is installed on the pad near the top of the elastic air storage pad (4).

4. The clamping structure for the pressure testing equipment according to claim 3, characterized in that, The compressed air assembly (5) includes a threaded ring (51), which is sleeved on the threaded part (21) provided on the outer wall of the clamping cylinder (2) and threadedly connected to the threaded part (21). The threaded part (21) is located on the clamping cylinder (2) above the groove (2b). The outer ring surface of the threaded ring (51) is sleeved with a rotating ring (52) that is rotatably connected. Several L-shaped frames (53) distributed in a ring are fixedly installed on the rotating ring (52).

5. The clamping structure for the pressure testing equipment according to claim 4, characterized in that, The L-shaped frame (53) corresponds one-to-one with the slot (2b), and the horizontal plate at the bottom of the L-shaped frame (53) is inserted into the slot (2b) and fixedly connected to the lower surface of the elastic air storage pad (4).

6. The clamping structure for the pressure testing equipment according to claim 1, characterized in that, The clamping cylinder (2) has multiple annularly distributed threaded through holes (2c) near the top opening, and each threaded through hole (2c) is fitted with a threaded fastening screw (6).

7. The clamping structure for the pressure testing equipment according to claim 1, characterized in that, A pull ring (71) is fixedly installed on the top of the elastic telescopic protective cover (7).

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