Tension and pressure testing device

Abstract

The utility model discloses a tension and pressure testing device, which comprises a base, a movable seat, a tension and pressure sensor and a hydraulic system, wherein the movable seat is arranged on the base and can slide along the length direction of the base; the hydraulic system comprises a hydraulic cylinder, an oil can and a steel cylinder, the hydraulic cylinder comprises a cylinder body fixed to the base and a piston installed in the cylinder body, the piston divides an inner cavity of the hydraulic cylinder into a first cavity and a second cavity, and the first cavity and the second cavity are arranged front and back. The pull pressure sensor is connected between a piston rod of the hydraulic cylinder and the movable seat, the oil can is used for supplementing hydraulic oil to the first cavity and the second cavity, and the steel cylinder is used for being communicated with the second cavity when the piston moves backwards and being communicated with the first cavity when the piston moves forwards. According to the utility model, the test precision is improved, complex correction structures and programs are not required to be configured, and the structure of the tension and pressure test device is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, in particular to a tension and pressure testing device. Background Art

[0002] With the continuous development of the manufacturing industry, the requirements for the precision of product parts are constantly increasing, which requires testing of various physical properties of product parts to determine whether the physical properties of the product meet the use requirements.

[0003] When testing some transmission components, it is usually necessary to use a tension and pressure test device to test the efficiency of the product. For example, when testing the efficiency of a roller screw, it is necessary to use a tension and pressure test device to detect the tension and pressure applied to the rated load when the roller screw drives the screw nut to move horizontally, and finally calculate to obtain the actual output power of the roller screw, so as to determine whether the efficiency of the roller screw meets the design requirements. Existing tension and pressure test devices usually use springs as loads. When the workpiece under test acts on the spring, the spring will stretch or shrink when it is stretched or compressed. When the spring stretches or shrinks to different degrees, the elastic stress generated is not constant. Therefore, it is difficult for the tension and pressure test device to obtain a more accurate value. Although various complex algorithms can be combined with the evaluation of spring performance to make the test force value as close to the actual value as possible, the structure and program setting of this test device are relatively complex, and the accuracy still needs to be improved. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the purpose of the utility model is to provide a tension and pressure test device with a simple structure and high test accuracy.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] The first aspect of the utility model provides a tension and pressure test device, comprising:

[0007] A tension and pressure test device comprises a base, a movable base mounted on the base and slidable along the length direction of the base, a tension and pressure sensor, and a hydraulic system;

[0008] The hydraulic system includes a hydraulic cylinder, an oil pot, and a steel cylinder. The hydraulic cylinder includes a cylinder body fixed on the base and a piston installed in the cylinder body. The piston divides the inner cavity of the hydraulic cylinder into a first chamber and a second chamber arranged front to back. The tension and pressure sensor is connected between the piston rod of the hydraulic cylinder and the movable seat. The oil pot is used to replenish hydraulic oil to the first chamber and the second chamber. The steel cylinder is used to communicate with the second chamber when the piston moves backward, and to communicate with the first chamber when the piston moves forward.

[0009] According to the tension and pressure testing device of the embodiment of the utility model, a movable seat is used as a force-bearing component and a hydraulic cylinder is used as a load. A tension and pressure sensor is arranged between the movable seat and the load. The interaction force between the movable seat and the load is measured by the tension and pressure sensor, and then the magnitude value of the force exerted by the workpiece under test on the movable seat is obtained. When the workpiece under test applies pressure to the movable seat, the piston rod moves backward to compress the second chamber, and the second chamber is connected to the steel cylinder so that the second chamber can form an almost constant pressure, and the oil pot replenishes the hydraulic oil to the first chamber in time; when the workpiece under test applies tension to the movable seat, the piston rod moves forward to compress the first chamber, and the first chamber is connected to the steel cylinder so that the first chamber can form an almost constant pressure, and the oil pot replenishes the hydraulic oil to the second chamber in time; when the movable seat is compressed or pulled, since the internal space of the steel cylinder is connected to the second chamber or the first chamber to form a larger pressure chamber, the movement of the piston makes the volume change of the larger pressure chamber almost negligible, so that during the movement of the piston, the pressure and tension applied by the piston to the tension pressure sensor will not produce a large change, so that the hydraulic cylinder forms a load that can output a constant reaction force, and then the force measured by the tension pressure sensor is more accurate and direct, thereby improving the test accuracy, without the need to configure complex correction structures and procedures, and simplifying the structure of the tension pressure testing device.

[0010] In the first aspect of the utility model, as an optional embodiment, the hydraulic system further includes a first valve and a second valve, the first chamber and the oil pot, the first chamber and the steel cylinder, the second chamber and the oil pot, and the second chamber and the steel cylinder are all connected through pipelines, the first valve is connected to the pipeline between the second chamber and the steel cylinder, and the second valve is connected to the pipeline between the second chamber and the oil pot. The hydraulic cylinder, the oil pot and the steel cylinder are connected by pipelines, the first valve controls the on-off between the second chamber and the steel cylinder, and the second valve controls the on-off between the second chamber and the oil pot. When the piston moves backward, the first valve opens and the second valve closes, and when the piston moves forward, the first valve closes and the second valve opens; the passage of the hydraulic system is controlled by the first valve and the second valve, so that the switching between the tension test and the pressure test can be realized.

[0011] In the first aspect of the utility model, as an optional embodiment, the first valve and the second valve are both solenoid valves. By setting the first valve and the second valve as solenoid valves, rapid switching between tension test and pressure test can be achieved to improve test efficiency.

[0012] In the first aspect of the utility model, as an optional embodiment, a linear guide is provided on the base, and a slider slidably mounted on the linear guide is provided on the movable seat. The movable seat is mounted on the base using a linear guide pair consisting of the linear guide and the slider, and the movable seat is guided to ensure that the moving direction of the movable seat is consistent with the direction of the force applied to the movable seat by the workpiece, so as to increase the accuracy of the test.

[0013] In the first aspect of the utility model, as an optional embodiment, the movable seat includes a bottom plate fixedly connected to the slider, a vertical plate fixed to the bottom plate and extending vertically, and a reinforcing rib fixedly connected between the bottom plate and the vertical plate, and the tension and pressure sensor is installed between the vertical plate and the piston rod. The vertical plate is used to provide a larger installation area for the tension and pressure sensor, and the bottom plate and the vertical plate are reinforced by the reinforcing ribs to prevent the movable seat from deforming when subjected to force, thereby improving the test accuracy.

[0014] In the first aspect of the utility model, as an optional embodiment, a connecting bolt is provided between the tension and pressure sensor and the piston rod, one end of the connecting bolt is passed through the piston rod and is screwed and fixed to the piston rod, the housing of the tension and pressure sensor is fixed to the vertical plate, and the other end of the connecting bolt is fixed to the movable end of the tension and pressure sensor. The movable end of the tension and pressure sensor is connected to the piston rod of the hydraulic cylinder by a screw rod, so as to realize a detachable connection between the tension and pressure sensor and the hydraulic cylinder, so as to facilitate the inspection and maintenance of the hydraulic cylinder and the tension and pressure sensor.

[0015] In the first aspect of the utility model, as an optional embodiment, a fixing frame is installed on the base, the top height of the fixing frame is higher than the cylinder height of the hydraulic cylinder, and the oil pot is fixedly installed on the top of the fixing frame. The fixing frame is used to install the oil pot, so that the height of the oil pot is higher than the height of the hydraulic cylinder, and the hydraulic oil in the oil pot flows into the hydraulic cylinder by its own gravity, that is, the hydraulic oil is replenished into the hydraulic cylinder by gravity, which simplifies the structure of the hydraulic system.

[0016] In the first aspect of the utility model, as an optional embodiment, the base is provided with a slide groove whose extension direction is consistent with the axial direction of the piston rod, the cylinder body of the hydraulic cylinder is fixedly connected to an adjustment seat, the adjustment seat is provided with a sliding boss embedded in the slide groove, and the adjustment seat is locked on the base by a plurality of fixing bolts. The position of the cylinder body of the hydraulic cylinder on the base is adjustable, so that the test device can be applied to the testing of different workpieces, thereby increasing the scope of application of the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 for Figure 1 AA section view;

[0020] Figure 3 for Figure 2 Magnified view at B in the middle;

[0021] Figure 4 This is a schematic diagram of the use status of the hydraulic system of the utility model;

[0022] Figure 5 This is a schematic diagram of another use state of the hydraulic system of the utility model.

[0023] In the figure: 10, base; 11, linear guide; 12, fixed frame; 13, mounting plate; 131, slide groove; 20, movable seat; 21, bottom plate; 211, slider; 22, reinforcing rib; 23, vertical plate; 30, tension pressure sensor; 40, hydraulic cylinder; 401, first chamber; 402, second chamber; 41, cylinder body; 42, piston; 43, connecting bolt; 50, oil pot; 61, first valve; 62, second valve; 70, cylinder. DETAILED DESCRIPTION

[0024] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0025] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Please refer to Figure 1-5 As shown, the embodiment of the utility model provides a dual-chamber hydraulic cylinder 40, which includes:

[0029] A base 10, a movable base 20 mounted on the base 10 and slidable along the length direction of the base 10, a tension and pressure sensor 30, and a hydraulic system;

[0030] The hydraulic system includes a hydraulic cylinder 40, an oil pot 50, and a steel cylinder. The hydraulic cylinder 40 includes a cylinder body 41 fixed on the base 10, and a piston 42 installed in the cylinder body 41. The piston 42 divides the inner cavity of the hydraulic cylinder 40 into a first chamber 401 and a second chamber 402 arranged front to back. The tension and pressure sensor 30 is connected between the piston 42 rod of the hydraulic cylinder 40 and the movable seat 20. The oil pot 50 is used to replenish hydraulic oil to the first chamber 401 and the second chamber 402. The steel cylinder is used to communicate with the second chamber 402 when the piston 42 moves backward, and to communicate with the first chamber 401 when the piston 42 moves forward.

[0031] According to the tension and pressure testing device of the embodiment of the utility model, the movable seat 20 is used as the force-bearing component, the hydraulic cylinder 40 is used as the load, and a tension and pressure sensor 30 is arranged between the movable seat 20 and the load. The interaction force between the movable seat 20 and the load is measured by the tension and pressure sensor 30, and then the magnitude value of the force applied by the workpiece to the movable seat 20 is obtained. When the workpiece to be measured applies pressure to the movable seat 20, the piston 42 rod moves backward to compress the second chamber 402, and the second chamber 402 is connected to the steel cylinder so that the second chamber 402 can form an almost constant pressure, and at the same time, the oil pot 50 replenishes the hydraulic oil to the first chamber 401 in time; when the workpiece to be measured applies tension to the movable seat 20, the piston 42 rod moves forward to compress the first chamber 401, and the first chamber 401 is connected to the steel cylinder so that the first chamber 401 can form an almost constant pressure, and at the same time, the oil pot 50 replenishes the hydraulic oil to the second chamber 402 in time; when the movable seat 20 is under pressure or tension, due to The internal space of the cylinder is connected to the second chamber 402 or the first chamber 401 to form a larger pressure chamber. The movement of the piston 42 makes the volume change of the larger pressure chamber almost negligible. Therefore, during the movement of the piston 42, the pressure and tension applied by the piston 42 to the tension pressure sensor 30 will not change significantly, so that the hydraulic cylinder 40 forms a load that can output a constant reaction force, and then the force measured by the tension pressure sensor 30 is more accurate and direct, thereby improving the test accuracy, eliminating the need to configure complex correction structures and procedures, and simplifying the structure of the tension pressure testing device.

[0032] In a preferred embodiment of the utility model, the hydraulic system also includes a first valve 61 and a second valve 62. The first chamber 401 and the oil pot 50, the first chamber 401 and the steel cylinder, the second chamber 402 and the oil pot 50, and the second chamber 402 and the steel cylinder are all connected by pipelines. The first valve 61 is connected to the pipeline between the second chamber 402 and the steel cylinder, and the second valve 62 is connected to the pipeline between the second chamber 402 and the oil pot 50. The hydraulic cylinder 40, the oil pot 50 and the steel cylinder are connected by pipelines, and the first valve 61 controls the connection and disconnection between the second chamber 402 and the steel cylinder, and the second valve 62 controls the connection and disconnection between the second chamber 402 and the oil pot 50. When the piston 42 moves backward, the first valve 61 opens and the second valve 62 closes; when the piston 42 moves forward, the first valve 61 closes and the second valve 62 opens; the passage of the hydraulic system is controlled by the first valve 61 and the second valve 62, so that the switching between the tension test and the pressure test can be realized.

[0033] In a preferred embodiment of the present invention, both the first valve 61 and the second valve 62 are solenoid valves. By setting the first valve 61 and the second valve 62 as solenoid valves, rapid switching between tension test and pressure test can be achieved to improve test efficiency.

[0034] In a preferred embodiment of the utility model, a linear guide rail 11 is provided on the base 10, and a slider 211 is provided on the movable seat 20 and is slidably mounted on the linear guide rail 11. The movable seat 20 is mounted on the base 10 using a pair of linear guide rails 11 composed of the linear guide rail 11 and the slider 211, and the movable seat 20 is guided to ensure that the moving direction of the movable seat 20 is consistent with the direction of the force applied to the movable seat 20 by the workpiece, so as to increase the accuracy of the test.

[0035] In a preferred embodiment of the utility model, the movable seat 20 includes a bottom plate 21 fixedly connected to the slider 211, a vertical plate 23 fixed to the bottom plate 21 and extending vertically, and a reinforcing rib 22 fixedly connected between the bottom plate 21 and the vertical plate 23, and the tension and pressure sensor 30 is installed between the vertical plate 23 and the rod of the piston 42. The vertical plate 23 is used to provide a larger installation area for the tension and pressure sensor 30, and the bottom plate 21 and the vertical plate 23 are reinforced by the reinforcing rib 22 to prevent the movable seat 20 from deforming when subjected to force, thereby improving the test accuracy.

[0036] In a preferred embodiment of the utility model, a connecting bolt 43 is provided between the tension and pressure sensor 30 and the piston 42 rod, one end of the connecting bolt 43 is connected to the piston 42 rod and is screwed and fixed to the piston 42 rod, the housing of the tension and pressure sensor 30 is fixed to the vertical plate 23, and the other end of the connecting bolt 43 is fixed to the movable end of the tension and pressure sensor 30. The movable end of the tension and pressure sensor 30 is connected to the piston 42 rod of the hydraulic cylinder 40 by a screw, so as to realize the detachable connection between the tension and pressure sensor 30 and the hydraulic cylinder 40, so as to facilitate the inspection and maintenance of the hydraulic cylinder 40 and the tension and pressure sensor 30.

[0037] In a preferred embodiment of the utility model, a fixing frame 12 is installed on the base 10, the top height of the fixing frame 12 is higher than the height of the cylinder body 41 of the hydraulic cylinder 40, and the oil pot 50 is fixedly installed on the top of the fixing frame 12. The fixing frame 12 is used to install the oil pot 50, so that the height of the oil pot 50 is higher than the height of the hydraulic cylinder 40, and the hydraulic oil in the oil pot 50 flows into the hydraulic cylinder 40 by its own gravity, that is, the hydraulic oil is replenished into the hydraulic cylinder 40 by gravity, which simplifies the structure of the hydraulic system.

[0038] In a preferred embodiment of the utility model, the base 10 is provided with a slide groove 131 whose extension direction is consistent with the axial direction of the piston 42 rod, the cylinder body 41 of the hydraulic cylinder 40 is fixedly connected to an adjustment seat, the adjustment seat is provided with a sliding boss embedded in the slide groove 131, and the adjustment seat is locked on the base 10 by a plurality of fixing bolts. A mounting plate 13 may be fixed on the base 10, the slide groove 131 is arranged on the mounting plate 13, the adjustment seat is located above the mounting plate 13 and the sliding boss is embedded in the slide groove 131, and after the position of the adjustment seat is adjusted into place, the adjustment seat is fixed to the mounting plate 13 by fixing bolts; the position of the cylinder body 41 of the hydraulic cylinder 40 on the base 10 is adjustable, so that the test device can be applied to the test of different workpieces, increasing the scope of application of the test device.

[0039] Although only certain components and embodiments of the present application have been illustrated and described, many modifications and changes may be conceived by those skilled in the art without actually departing from the scope and spirit of the claims, such as changes in the size, dimensions, structure, shape and proportion of the various elements, mounting arrangements, material usage, color, orientation, etc.

[0040] The above-mentioned implementation mode is only a preferred implementation mode of the embodiment of the utility model, and cannot be used to limit the scope of protection of the embodiment of the utility model. Any non-substantial changes and replacements made by technical personnel in this field on the basis of the embodiment of the utility model shall fall within the scope of protection required by the embodiment of the utility model.

Claims

1. A tension and pressure testing device, characterized in that: It includes a base, a movable seat installed on the base and slidable along the length direction of the base, a tension and pressure sensor, and a hydraulic system; The hydraulic system includes a hydraulic cylinder, an oil pot, and a steel cylinder. The hydraulic cylinder includes a cylinder body fixed on the base and a piston installed in the cylinder body. The piston divides the inner cavity of the hydraulic cylinder into a first chamber and a second chamber arranged front to back. The tension and pressure sensor is connected between the piston rod of the hydraulic cylinder and the movable seat. The oil pot is used to replenish hydraulic oil to the first chamber and the second chamber. The steel cylinder is used to communicate with the second chamber when the piston moves backward, and to communicate with the first chamber when the piston moves forward.

2. The tension and pressure testing device according to claim 1, characterized in that: The hydraulic system also includes a first valve and a second valve. The first chamber and the oil pot, the first chamber and the steel cylinder, the second chamber and the oil pot, and the second chamber and the steel cylinder are all connected through pipelines. The first valve is connected to the pipeline between the second chamber and the steel cylinder, and the second valve is connected to the pipeline between the second chamber and the oil pot.

3. The tension and pressure testing device according to claim 2, characterized in that: The first valve and the second valve are both solenoid valves.

4. The tension and pressure testing device according to claim 1, characterized in that: The base is provided with a linear guide rail, and the movable seat is provided with a sliding block slidably installed on the linear guide rail.

5. The tension and pressure testing device according to claim 4, characterized in that: The movable seat includes a bottom plate fixedly connected to the slider, a vertical plate fixed to the bottom plate and extending vertically, and a reinforcing rib fixedly connected between the bottom plate and the vertical plate. The tension and pressure sensor is installed between the vertical plate and the piston rod.

6. The tension and pressure testing device according to claim 5, characterized in that: A connecting bolt is arranged between the tension and pressure sensor and the piston rod, one end of the connecting bolt is passed through the piston rod and is screwed and fixed to the piston rod, the shell of the tension and pressure sensor is fixed on the vertical plate, and the other end of the connecting bolt is fixed to the movable end of the tension and pressure sensor.

7. The tension and pressure testing device according to claim 1, characterized in that: A fixing frame is installed on the base, the top height of the fixing frame is higher than the cylinder body height of the hydraulic cylinder, and the oil pot is fixedly installed on the top of the fixing frame.

8. The tension and pressure testing device according to claim 1, characterized in that: The base is provided with a slide groove whose extension direction is consistent with the axial direction of the piston rod. The cylinder body of the hydraulic cylinder is fixedly connected to an adjustment seat. The adjustment seat is provided with a sliding boss embedded in the slide groove. The adjustment seat is locked on the base by a plurality of fixing bolts.

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