Calibration structure of high-power diesel engine hydraulic dynamometer and installation method

Abstract

The invention provides a calibration structure of a high-power diesel engine hydraulic dynamometer and an installation method, the calibration structure comprises a dynamometer body, the dynamometer body comprises a base and an arm lever, and one end of the arm lever is fixedly connected with the dynamometer body; the supporting seat is fixedly connected with the base, the supporting seat is arranged under the other end of the arm rod, and a lifter is fixedly arranged on the connecting frame; the standard tension and compression sensor is arranged between the screw jacking device and the end, away from the dynamometer body, of the arm lever, and the two ends of the standard tension and compression sensor are hinged to the lifting structure of the lifter and the end, away from the dynamometer body, of the arm lever respectively. According to the invention, the standard tension and compression sensor and the lifter are connected with the end part of the arm lever, so that an operator can change the stress of the far end of the arm lever by controlling the lifting structure of the lifter, and the dynamometer can conveniently calibrate through the reading of the torque display instrument and the reading of the tension and compression sensor.

Description

Technical Field

[0001] The present invention belongs to the field of diesel engine performance detection, and particularly relates to a calibration structure and installation method for a hydraulic dynamometer of a high-power diesel engine. Background Art

[0002] After the diesel engine completes the overall assembly, it is necessary to conduct detection tests on the overall performance and power parameters of the machine for subsequent delivery to customers. When testing the load of the diesel engine, a hydraulic dynamometer is required.

[0003] To ensure the data accuracy of the dynamometer, it is necessary to regularly detect and calibrate the hydraulic dynamometer for accuracy. The existing calibration device methods are as Figure 1 shown. Now, after hanging a tray on the arm of the dynamometer, the full-scale weights are gradually increased or decreased on the arm of the dynamometer. By comparing the value displayed on the dynamometer with the error between the weight value and the specified value, those with an error not exceeding the specified value are considered qualified. However, during the process of increasing and decreasing the weights and installing the tray carrying the weights, manual installation is required. Moreover, for the inspection of high-power equipment, the weight specifications usually used are relatively large, and multiple people are usually required to cooperate in handling during the handling process. There is a safety hazard that personnel may be injured by being hit during the operation process, and the entire operation process is time-consuming and laborious, and the operation efficiency is extremely low. For large-scale production tests, it will have an adverse impact on delaying the delivery cycle of the entire machine. Summary of the Invention

[0004] In view of this, the present invention aims to provide a calibration structure and installation method for a hydraulic dynamometer of a high-power diesel engine, saving the time for manually handling weights and accelerating the calibration speed of the hydraulic dynamometer.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] A calibration structure for a hydraulic dynamometer of a high-power diesel engine, comprising

[0007] a dynamometer body, which includes a base and an arm, and one end of the arm is fixedly connected to the dynamometer body;

[0008] a support seat, which is fixedly connected to the base, and the support seat is placed directly below the other end of the arm, and a lifter is fixedly installed on the connecting frame;

[0009] a standard tension-compression sensor, which is placed between the screw jack and the end of the arm far from the dynamometer body, and both ends of the standard tension-compression sensor are hinged to the lifting structure of the lifter and the end of the arm far from the dynamometer body respectively.

[0010] Further, the arm includes an upper hinge hole and a lower fixing hole, and a hinge shaft can pass through the dynamometer body and the arm to hinge the arm to the dynamometer body.

[0011] Further, the support base includes a horizontal plate and a side plate, and the bottom plate is horizontally arranged. The side plate is fixedly connected to the bottom plate, the lifter is fixedly arranged on the horizontal plate, and the side plate is fixedly connected to the base.

[0012] Further, a reinforcing rib plate is fixedly arranged between the side plate and the horizontal plate.

[0013] Further, the jacking device is a screw jacking device.

[0014] Based on the above calibration structure, the present application also provides an installation method for the above structure, including

[0015] S1: Measuring the self-gravity value F1 of the original arm of the original weight calibration device of the dynamometer body at the end far from the dynamometer body.

[0016] S2: Measuring the effective length L1 of the original arm of the original weight calibration device.

[0017] S3: Measuring the effective length L2 of the arm in the above calibration structure.

[0018] S4: According to the torque formula: F2 = F1 * L1 / L2, obtaining the ideal value F2 of the gravity received by the end of the arm far from the dynamometer body in the above calibration structure.

[0019] S5: Using the upper hinge hole of the arm to hinge the arm to the dynamometer body, and simultaneously measuring the actual gravity value F3 of the end of the arm far from the dynamometer body.

[0020] S6: According to the gap between F2 and F3, increasing or reducing the self-weight of the arm to make F2 = F3.

[0021] S7: Fixing the arm through the lower fixing hole of the arm.

[0022] S8: Sequentially installing the support base and the jacking device, and making both ends of the standard tension and compression sensor be hinged to the lifting structure of the jacking device and the end of the arm far from the dynamometer body through the hinge connecting piece.

[0023] Further, step S1 includes hinging one end of the original arm to the dynamometer body and vertically measuring the gravity value F1 of the end of the original arm far from the dynamometer body through a tensiometer.

[0024] Further, step S5 includes vertically measuring the actual gravity value F3 of the end of the arm far from the dynamometer body through a tensiometer.

[0025] Compared with the prior art, the calibration structure and installation method of a high-power diesel engine hydraulic dynamometer described in the present invention have the following advantages:

[0026] The present invention uses a standard tension and compression sensor and a lifter connected to the end of the arm to enable an operator to control the lifting structure of the lifter, thereby changing the force on the distal end of the arm, facilitating the calibration of the dynamometer through the readings of its own torque display and the tension and compression sensor;

[0027] By arranging hinge holes on the arm, it is convenient to measure the effective gravity of the distal end of the arm during the installation process, so as to compare it with the original gravity of the distal end of the arm, making the distal end gravity of the two arms before and after the change the same, and avoiding the influence on the calibration of the dynamometer due to the change of the arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 It is a schematic structural diagram during the calibration process of the dynamometer in the background art

[0030] Figure 2 It is a schematic structural diagram of the dynamometer calibration in this embodiment;

[0031] Figure 3 It is a schematic structural diagram of the arm in this embodiment;

[0032] Figure 4 It is a schematic structural diagram of the support base.

[0033] Description of the reference numerals:

[0034] 1 - Dynamometer body; 11 - Base; 2 - Arm; 21 - Upper hinge hole; 22 - Lower fixing hole; 3 - Support base; 31 - Horizontal plate; 32 - Side plate; 33 - Rib plate; 4 - Screw jack; 5 - Tension and compression sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0038] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0039] The calibration structure of the high-power diesel engine hydraulic dynamometer described in the present invention includes

[0040] Dynamometer body 1, which includes a base 11 and an arm rod 2. One end of the arm rod 2 is fixedly connected to the dynamometer body 1. More specifically, the dynamometer body 1 includes a stator and a rotor. In existing dynamometers, most of the arm rods 2 are connected to the rotor to facilitate the detection of the load capacity of the device to be tested. In the present invention, the connection position of the arm rod 2 is the same as that of the arm rod 2 in the existing dynamometer. On one side of the base 11, a support base 3 is fixedly provided. The support base 3 is placed directly below the end of the arm rod 2 far from the dynamometer body 1, and a lifter is fixedly provided on the connecting frame. Specifically, the support base 3 includes a horizontal plate 31 and a side plate 32. There is an angle between the horizontal plate 31 and the side plate 32, so that the side plate 32 can be connected to the base 11 through bolts, and the horizontal plate 31 remains horizontal. The specific angle of this angle can be obtained by measuring the angle between the side wall of the base 11 and the horizontal plane. At the same time, a reinforcing rib plate 33 is fixedly provided between the side plate 32 and the horizontal plate 31 to improve the strength of the support base 3. The jacking device is a screw jack 4, which uses a worm and gear pair or a gear set and a screw and nut pair as a transmission system inside, so that a crank with a horizontal rotation axis drives the screw to rotate, so that the lifting structure at the end of the screw moves in the vertical direction. The specific structure, transmission, and control methods of the screw jack 4 are all prior art and will not be elaborated here. A standard tension and compression sensor 5 is provided between the lifting structure and the arm rod 2. Both ends of the tension and compression sensor 5 are hinged to the end of the arm rod 2 far from the dynamometer body 1 and the lifting structure respectively.

[0041] Optionally, the hinge connection between the standard tension and compression sensor 5 and the arm rod 2 can be achieved by the cooperation of a rotating shaft and a sleeve. Specifically, the rotating shaft is connected to the end of the arm rod 2, the sleeve is rotatably connected to the rotating shaft, and a cylindrical connecting head extends downward from the middle of the sleeve, and is screwed to the thread at one end of the standard tension and compression sensor 5 through the connecting head; in this embodiment, the lifting structure is a flange fixed at the top of the screw. The hinge connection between the standard tension and compression sensor 5 and the lifting structure can be achieved by connecting a metal plate to the flange, then fixing a hinge ear on the metal plate, passing a rotating shaft through the hinge ear, and extending a connecting head from the middle of the rotating shaft, and connecting to the thread at the other end of the standard tension and compression sensor 5 through the connecting head, so that both ends of the standard tension and compression sensor 5 are hinged to the lifting structure and the arm rod 2 respectively.

[0042] The arm rod 2 includes an upper hinge hole 21 and a lower fixing hole 22. A hinge shaft can pass through the dynamometer body 1 and the arm rod 2 to hinge the arm rod 2 to the dynamometer body 1. The corresponding position of the fixing hole and the dynamometer body 1 can pass through a bolt and cooperate with the upper hinge hole 21 to relatively fix the arm rod 2 to the dynamometer body 1.

[0043] During the use of the above-mentioned dynamometer body 1, after installing the calibration arm 2 and the support base 3 on the dynamometer, only the crank of the screw jack 4 needs to be rotated to apply a pulling force or a jacking force to the standard tension and compression sensor 5 through the lifting structure, so that the arm 2 drives the rotor of the dynamometer body 1 to rotate under the influence of an external force, so that the torque display of the dynamometer body 1 shows the received torque. At the same time, the tension and compression sensor 5 also shows the pulling force or pressure it receives. By comparing the torque with the pulling force or pressure, it is judged whether the torque displayed by the torque display of the dynamometer meets the standard, so as to calibrate the dynamometer.

[0044] Based on the above calibration structure, the present application also provides an installation method for the above structure, including

[0045] S1: Measure the self-gravity value F1 of the original arm of the original weight calibration device of the dynamometer body. In this embodiment, one end of the original arm can be hinged to the dynamometer body first, and then the original arm is pulled by a spring dynamometer to rotate upward, so as to vertically measure the gravity value F1 of the end of the original arm away from the dynamometer body through a tensiometer.

[0046] S2: Measure the effective length L1 of the original arm of the original weight calibration device. The effective length refers to the length from the end of the arm close to the dynamometer to the part where the original arm is connected to the tray.

[0047] S3: Measure the effective length L2 of the arm in the above calibration structure.

[0048] S4: According to the torque formula: F2 = F1 * L1 / L2, obtain the ideal value F2 of the gravity of the end of the arm away from the dynamometer body in the above calibration structure.

[0049] S5: Use the upper hinge hole of the arm to hinge the arm to the dynamometer body, and at the same time measure the actual gravity value F3 of the end of the arm away from the dynamometer body. In this embodiment, F3 can be vertically measured by a tensiometer at the end of the arm away from the dynamometer. The specific measurement method is the same as that of F1 in step S1 and will not be repeated here.

[0050] S6: According to the gap between F2 and F3, increase or reduce the self-weight of the arm to make F2 = F3; in this embodiment, the mass of the arm can be reduced or increased by opening a weight-reducing hole or fixing a weight on the arm, so as to eliminate the influence on the self-parameters of the dynamometer body after replacing the arm.

[0051] S7: Fix the arm through the lower fixing hole of the arm to complete the fixed connection between the arm and the dynamometer body.

[0052] S8: Install the support base and the jacking device in sequence, and use the hinged connecting piece to hinge the two ends of the standard tension-compression sensor to the lifting structure of the jacking device and the end of the arm away from the dynamometer body respectively, so as to complete the installation work of the calibration structure of the dynamometer body.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A calibration structure and installation method for a high-power diesel engine hydraulic dynamometer, characterized in that: include The dynamometer body comprises a base and an arm, one end of the arm is fixedly connected to the dynamometer body; A support seat is fixedly connected to the base, and the support seat is placed directly below the other end of the arm, and a lifter is fixedly provided on the connecting frame; The standard tension and compression sensor is placed between the screw lifter and the end of the arm away from the dynamometer body, and the two ends of the standard tension and compression sensor are respectively hinged to the lifting structure of the lifter and the end of the arm away from the dynamometer body.

2. The calibration structure and installation method of a high-power diesel engine hydraulic dynamometer according to claim 1 is characterized in that: The arm comprises an upper hinge hole and a lower fixing hole, and an hinge shaft can pass through the dynamometer body and the arm so that the arm is hinged to the dynamometer body.

3. The calibration structure and installation method of a high-power diesel engine hydraulic dynamometer according to claim 1, characterized in that: The support seat includes a horizontal plate and a side plate, and the bottom plate is horizontally arranged, the side plate is fixedly connected to the bottom plate, the lifter is fixedly arranged on the horizontal plate, and the side plate is fixedly connected to the base.

4. The calibration structure and installation method of a high-power diesel engine hydraulic dynamometer according to claim 3 is characterized in that: Reinforcement ribs are fixed between the side plates and the horizontal plates.

5. The calibration structure and installation method of a high-power diesel engine hydraulic dynamometer according to claim 1, characterized in that: The lifter is a screw lifter.

6. A method for installing a calibration structure of a high-power diesel engine hydraulic dynamometer, characterized in that: include S1: Measure the gravity value F1 of the original arm of the original weight calibration device of the dynamometer body away from the dynamometer body. S2: Measure the effective length L1 of the original arm of the original weight calibration device; S3: Measure the effective length L2 of the arm in the above calibration structure; S4: According to the torque formula: F2 = F1*L1 / L2, the ideal value F2 of the arm far away from the dynamometer body in the above calibration structure is obtained; S5: The arm is hinged to the dynamometer body by using the upper hinge hole of the arm, and at the same time, the actual gravity value F3 at the end of the arm away from the dynamometer body is measured; S6: According to the difference between F2 and F3, increase or reduce the deadweight of the arm so that F2 = F3; S7: Fix the arm through the lower fixing hole of the arm; S8: Install the support base and the jack in sequence, and hinge the two ends of the standard tension and compression sensor to the lifting structure of the jack and the end of the arm away from the dynamometer body through the hinged connector.

7. The calibration structure and installation method of a high-power diesel engine hydraulic dynamometer according to claim 6 is characterized in that: Step S1 includes hingedly connecting one end of the original arm to the dynamometer body, and vertically measuring the gravity value F1 of the end of the original arm away from the dynamometer by a dynamometer.

8. The calibration structure and installation method of a high-power diesel engine hydraulic dynamometer according to claim 6 is characterized in that: Step S5 includes vertically measuring the actual gravity value F3 of the end of the arm away from the dynamometer by means of a dynamometer.

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