Reciprocating testing machine and lubrication performance testing method

Abstract

The present invention proposes a reciprocating testing machine and a lubrication performance testing method. A thrust balancing device is provided at the rear end of the thrust connecting rod of the reciprocating testing machine. The thrust balancing device has a connecting arm, and the connecting arm is arranged in a lateral direction perpendicular to the thrust connecting rod. The reciprocating testing machine also includes multiple groups of specimen clamping assemblies and multiple groups of friction measurement assemblies. The multiple groups of specimen clamping assemblies are respectively arranged on the base and arranged in a lateral interval. Each specimen clamping assembly includes an oil box and an upper specimen chuck. The oil box is arranged on the base through an elastic bracket and can be provided with a lower specimen and an oil to be tested. The upper specimen chuck is connected to the connecting arm through a chuck connecting rod and can clamp an upper specimen. The chuck connecting rod is parallel to the thrust connecting rod and extends backward, so that the upper specimen chuck is located above the oil box. Multiple groups of friction measurement assemblies are respectively connected to multiple oil boxes. Through the above structural design, the reciprocating testing machine proposed by the present invention can detect multiple oil samples at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of lubrication performance evaluation test equipment, and in particular to a reciprocating test machine and a lubrication performance test method. Background Art

[0002] Lubrication performance evaluation test equipment, such as high-frequency reciprocating test machines, belong to high-frequency reciprocating motion type test machines, which can be used to detect lubricants and the friction and wear performance of petroleum liquids such as diesel, gasoline, marine fuel, and lubricating oil. The design concept of the existing high-frequency reciprocating motion type test machine is mainly reflected in the design of the main machine mechanical structure, the displacement measurement and control technology, the temperature measurement and control of the test oil sample, and other aspects. However, the existing high-frequency reciprocating motion type test machine can only detect one oil sample per test, and the test efficiency is low. The existing high-frequency reciprocating motion type test machine mainly uses a linear differential transformer (LVDT) displacement sensor or a grating displacement sensor to measure displacement. These two types of displacement sensors require a dedicated iron core or grating ruler to sense the displacement signal, resulting in a relatively complex mechanical structure of the displacement sensor. In addition, some existing high-frequency reciprocating motion type test machines have the function of detecting gasoline, but can only detect gasoline above room temperature, and do not have the ability to detect the lubrication performance of gasoline under low temperature conditions. Summary of the invention

[0003] A main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art and provide a reciprocating testing machine capable of testing multiple oil samples at the same time.

[0004] Another main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art and provide a reciprocating testing machine capable of testing multiple oil samples at the same time.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] According to one aspect of the present invention, there is provided a reciprocating testing machine, comprising a base, an exciter, a thrust connecting rod, a loading assembly and a displacement measuring assembly, wherein the exciter is arranged on the base, the rear end of the thrust connecting rod is connected to the exciter, the loading assembly is connected to the front end of the thrust connecting rod, and the displacement measuring assembly is arranged between the base and the thrust connecting rod. A thrust balancing device is arranged at the rear end of the thrust connecting rod, and the thrust balancing device has a connecting arm, and the connecting arm is arranged in a transverse direction perpendicular to the thrust connecting rod. The reciprocating testing machine also comprises a plurality of sets of specimen clamping assemblies and a plurality of sets of friction measuring assemblies. The multiple groups of test specimen clamping assemblies are respectively arranged on the base and arranged at intervals in the transverse direction, each of the test specimen clamping assemblies comprises an oil box and an upper test specimen chuck, the oil box is arranged on the base through an elastic bracket and can be provided with a lower test specimen and oil to be tested, the upper test specimen chuck is connected to the connecting arm through a chuck connecting rod and can clamp an upper test specimen, the chuck connecting rod is parallel to the thrust connecting rod and extends backward, so that the upper test specimen chuck is located above the oil box. The multiple groups of friction force measurement assemblies are respectively connected to the multiple oil boxes.

[0007] According to one embodiment of the present invention, the reciprocating testing machine includes an even number of the specimen clamping assemblies, and the even number of the specimen clamping assemblies are respectively located on the left and right sides of the thrust connecting rod, and the number of the specimen clamping assemblies located on the left side of the thrust connecting rod is equal to the number of the specimen clamping assemblies located on the right side of the thrust connecting rod.

[0008] According to one embodiment of the present invention, the plurality of specimen clamping assemblies are evenly spaced and arranged.

[0009] According to one embodiment of the present invention, the thrust balancing device is triangular or trapezoidal, so that the transverse dimension of the front end of the thrust balancing device is greater than the transverse dimension of the rear end thereof, and the connecting arm is the front end of the thrust balancing device.

[0010] According to one embodiment of the present invention, the thrust connecting rod passes through the thrust balancing device, and a thrust bearing is provided between the thrust balancing device and the thrust connecting rod.

[0011] According to one embodiment of the present invention, the orthographic projection figure of the thrust balancing device on the base is an axisymmetric figure, and the axis of symmetry of the axisymmetric figure is the center line of the thrust connecting rod.

[0012] According to one embodiment of the present invention, each of the specimen clamping assemblies comprises a plurality of the oil boxes, and the plurality of oil boxes are configured to be selectively arranged; wherein the plurality of oil boxes have different shapes, and a cooling cavity is provided inside at least one of the plurality of oil boxes for accommodating a coolant.

[0013] According to one embodiment of the present invention, the plurality of oil boxes of each of the specimen clamping assemblies at least include a rectangular oil box and a circular oil box, and the circular oil box is provided with the cooling cavity.

[0014] According to one embodiment of the present invention, the displacement measuring assembly includes a laser displacement sensor and a laser signal reflecting sheet. The laser displacement sensor is disposed on the base. The laser signal reflecting sheet is disposed on the thrust connecting rod and is arranged opposite to the laser displacement sensor in the front-rear direction. The laser displacement sensor is configured to send a laser signal to the laser signal reflecting sheet, and measure the vibration amplitude of the thrust connecting rod according to the laser signal reflected back by the laser signal reflecting sheet.

[0015] According to one embodiment of the present invention, the elastic bracket is processed as an integral structure, and a bending groove is provided at a bending position of the elastic bracket, so that the thickness of the bending position of the elastic bracket is smaller than that of other positions.

[0016] According to one embodiment of the present invention, the reciprocating test machine further comprises a plurality of temperature control and measurement components respectively arranged between the plurality of elastic supports and the plurality of oil boxes, each of the temperature control and measurement components comprising a heating platform, a heating element and a temperature measurement sensor. The heating platform is arranged on the elastic support, and the oil box is detachably arranged on the heating platform so as to be arranged on the elastic support through the heating platform. The heating element is arranged in the heating platform. The temperature measurement sensor is connected to the heating platform.

[0017] According to one embodiment of the present invention, a receiving groove is provided on the top of the heating table, and the oil box is detachably arranged in the receiving groove; wherein, an inclined positioning hole is provided on the heating table, and the positioning hole passes through the side wall of the heating table and the groove wall of the receiving groove, and the heating table is configured to position the oil box by a positioning piece passing through the positioning hole.

[0018] According to one embodiment of the present invention, each of the friction force measurement components comprises a friction force measurement sensor and a friction force connecting rod. The friction force measurement sensor is disposed on the base. The friction force connecting rod is connected between the friction force sensor and the heating platform.

[0019] According to one embodiment of the present invention, the exciter is arranged on the base through a bearing seat assembly so that the exciter can rotate relative to the base in a vertical direction, and the bearing seat assembly includes two bearing seats and two bearings. The two bearing seats are arranged on the base and are respectively located on both sides of the exciter. The two bearings are respectively connected between the two bearing seats and the two sides of the exciter.

[0020] According to one embodiment of the present invention, the loading assembly includes a weight, and the weight is hung below the front end of the thrust connecting rod via a hanging rope.

[0021] According to another aspect of the present invention, a lubrication performance testing method is provided for testing the lubrication performance of an oil to be tested, wherein the method comprises the following steps:

[0022] A reciprocating test machine is provided, comprising a base, an exciter, a thrust connecting rod, a loading assembly, a displacement measuring assembly, a plurality of groups of specimen clamping assemblies and a plurality of groups of friction measuring assemblies, wherein the exciter is arranged on the base, the rear end of the thrust connecting rod is connected to the exciter, the loading assembly is connected to the front end of the thrust connecting rod, the displacement measuring assembly is arranged between the base and the thrust connecting rod, a thrust balancing device is arranged at the rear end of the thrust connecting rod, the thrust balancing device has a connecting arm, the connecting arm is arranged in a lateral direction perpendicular to the thrust connecting rod, the plurality of groups of specimen clamping assemblies are respectively arranged on the base and arranged in a lateral direction at intervals, each of the specimen clamping assemblies comprises an oil box and an upper specimen chuck, the oil box is arranged on the base through an elastic bracket, the upper specimen chuck is connected to the connecting arm through a chuck connecting rod, the chuck connecting rod is parallel to the thrust connecting rod and extends backwards, so that the upper specimen chuck is located above the oil box, and the plurality of groups of friction measuring assemblies are respectively connected to the plurality of oil boxes;

[0023] A plurality of lower test pieces are respectively arranged in the plurality of oil boxes, and a plurality of upper test pieces are clamped by the plurality of upper test piece clamps respectively;

[0024] Pour the oil to be tested into the multiple oil boxes respectively, and immerse the lower test piece in the oil to be tested;

[0025] Moving the upper specimen chuck to bring the upper specimen into contact with the lower specimen;

[0026] Using the vibration exciter to drive the multiple groups of specimen clamping assemblies to perform simulated vibration through the thrust connecting rod, so that the upper specimen and the lower specimen generate simulated friction;

[0027] Using the displacement measurement component to measure the stroke and frequency of the simulated vibration, and using the friction measurement component to measure the friction between the upper test piece and the lower test piece;

[0028] The lubrication performance of the oil to be tested is calculated based on the stroke and frequency of the simulated vibration and the friction between the upper test piece and the lower test piece.

[0029] It can be seen from the above technical scheme that the advantages and positive effects of the reciprocating testing machine and lubrication performance testing method proposed in the present invention are:

[0030] The reciprocating testing machine and lubrication performance testing method proposed in the present invention utilize a thrust balancing device disposed at the rear end of a thrust connecting rod, and utilize a structural design of connecting multiple test piece clamping assemblies using the thrust balancing device, so that the reciprocating testing machine proposed in the present invention can simultaneously test multiple oil samples, thereby greatly improving the detection efficiency of the reciprocating testing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are merely exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always refer to the same or similar parts. Among them:

[0032] Figure 1 is a top view of a reciprocating testing machine according to an exemplary embodiment;

[0033] Figure 2 yes Figure 1 A side view of a reciprocating testing machine is shown;

[0034] Figure 3 yes Figure 2 Right view of;

[0035] Figure 4 yes Figure 1 A perspective view of the thrust balancing device shown;

[0036] Figure 5 yes Figure 1 A perspective view of the elastic bracket shown;

[0037] Figure 6 yes Figure 1 A perspective view of a rectangular oil box of a reciprocating test machine is shown;

[0038] Figure 7 yes Figure 1 A perspective view of a circular oil box of a reciprocating test machine is shown;

[0039] Figure 8 yes Figure 1 A perspective view of the heating table is shown;

[0040] Fig. 9 yes Figure 1 A longitudinal cross-section of the heating station is shown.

[0041] The following are the descriptions of the reference numerals:

[0042] 110. Support legs;

[0043] 120. Base;

[0044] 130. Bearing seat;

[0045] 131 bearings;

[0046] 210. Vibrator;

[0047] 220. Laser signal reflector;

[0048] 310.Thrust balancing device;

[0049] 311. Connecting arm;

[0050] 320. Elastic bracket;

[0051] 321. Bending groove;

[0052] 331. Rectangular oil box;

[0053] 332. Round oil box;

[0054] 3321. Cooling cavity;

[0055] 340. Laser displacement sensor;

[0056] 410. Friction connecting rod;

[0057] 420.Thrust connecting rod;

[0058] 430. Friction force measurement sensor;

[0059] 510. Heating table;

[0060] 511. Positioning hole;

[0061] 520. Temperature measurement sensor;

[0062] 530. Upper test piece chuck;

[0063] 610. Heating rod;

[0064] 710.Thrust bearing;

[0065] 810. Weights;

[0066] 820. Lanyard;

[0067] 830.Chuck connecting rod. DETAILED DESCRIPTION

[0068] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0069] In the following description of different exemplary embodiments of the present invention, reference is made to the accompanying drawings, which form a part of the present invention and in which different exemplary structures, systems and steps that can implement multiple aspects of the present invention are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the present invention. Moreover, although the terms "above", "between", "within", etc. may be used in this specification to describe different exemplary features and elements of the present invention, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0070] See also Figure 1 , which representatively shows a top view of the reciprocating test machine proposed in the present invention. In this exemplary embodiment, the reciprocating test machine proposed in the present invention is described by taking as an example a test device for evaluating the lubrication performance of an oil such as diesel. It is easy for those skilled in the art to understand that in order to apply the relevant design of the present invention to a test device for detecting other types of oil or other objects, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the reciprocating test machine proposed in the present invention.

[0071] like Figure 1 As shown, in this embodiment, the reciprocating testing machine proposed by the present invention includes a base 120, an exciter 210, a thrust connecting rod 420, a loading assembly and a displacement measuring assembly. Among them, the exciter 210 is arranged on the base 120. The rear end of the thrust connecting rod 420 is connected to the exciter 210, so that the thrust connecting rod 420 can be driven by the exciter 210 to generate vibration. The loading assembly is connected to the front end of the thrust connecting rod 420, so that the loading assembly can apply a downward loading force to the thrust connecting rod 420, thereby simulating a friction contact state close to the actual situation between the upper specimen and the lower specimen. The displacement measuring assembly is arranged between the base 120 and the thrust connecting rod 420, and the displacement measuring assembly can measure the vibration amplitude of the thrust connecting rod 420 during the test.

[0072] On this basis, if Figure 1As shown, in this embodiment, the reciprocating testing machine proposed by the present invention further includes a thrust balancing device 310, two sets of specimen clamping assemblies and two sets of friction force measuring assemblies. Figures 2 to 9 , Figure 2 A side view of a reciprocating testing machine is representatively shown in FIG. Figure 3 A representative example is shown in Figure 2 Right view of; Figure 4 A perspective view of a thrust balancing device 310 is representatively shown in FIG. Figure 5 A three-dimensional view of the elastic bracket 320 is representatively shown in FIG. Figure 6 A perspective view of a rectangular oil box 331 is representatively shown in FIG. Figure 7 A perspective view of a circular oil box 332 is representatively shown in FIG. Figure 8 A perspective view of the heating stage 510 is representatively shown in FIG. Fig. 9 A longitudinal cross-sectional view of the heating platform 510 is representatively shown in FIG. 1 and FIG. 2 are combined with the above drawings to describe in detail the structure, connection mode and functional relationship of the main components of the reciprocating testing machine proposed in the present invention.

[0073] like Figures 1 to 4 As shown, in this embodiment, the thrust balancing device 310 is arranged at a position near the rear end of the thrust connecting rod 420. The thrust balancing device 310 has a connecting arm 311, and the connecting arm 311 is arranged in a transverse direction perpendicular to the thrust connecting rod 420. Two groups of specimen clamping assemblies are respectively arranged on the base 120 and arranged in a transverse direction (with the extension direction of the thrust connecting rod 420 as the longitudinal direction, and the transverse direction is the horizontal direction perpendicular to the longitudinal direction). Specifically, each specimen clamping assembly includes an oil box and an upper specimen clamp 530, the oil box is arranged on the base 120 through an elastic bracket 320 and can be used to set a lower specimen and a test oil, the upper specimen clamp 530 is connected to the connecting arm 311 through a clamp connecting rod 830 and can be used to clamp an upper specimen, the clamp connecting rod 830 is parallel to the thrust connecting rod 420 and extends backward, so that the upper specimen clamp 530 is located above the oil box. The two sets of friction force measurement components are respectively connected to the two oil boxes of the two sets of specimen clamping components, and are respectively used to measure the lubrication performance of the two oil samples to be tested placed in the two oil boxes. Through the above structural design, the reciprocating test machine proposed in the present invention uses the thrust balancing device 310 to be set at the rear end of the thrust connecting rod 420, and uses the thrust balancing device 310 to connect multiple specimen clamping components. The structural design enables the reciprocating test machine proposed in the present invention to simultaneously test multiple oil samples, greatly improving the detection efficiency of the reciprocating test machine.

[0074] It should be noted that, in the present embodiment, the reciprocating testing machine including two specimen clamping assemblies is used as an example for explanation, so that the reciprocating testing machine proposed in the present invention can detect at least two oil samples at the same time. In other embodiments, the reciprocating testing machine proposed in the present invention may also include multiple specimen clamping assemblies, and correspondingly include multiple friction measurement assemblies, such as three, four, six, etc. In other words, based on the design concept of the reciprocating testing machine proposed in the present invention, in any possible embodiment of the present invention, the reciprocating testing machine includes multiple specimen clamping assemblies and multiple friction measurement assemblies, and the multiple specimen clamping assemblies are arranged at intervals in the lateral direction, and the multiple friction measurement assemblies are respectively connected to the multiple oil boxes of the multiple specimen clamping assemblies, so as to realize the detection of multiple oil samples at the same time.

[0075] Preferably, based on the structural design that the reciprocating test machine includes multiple specimen clamping assemblies, the reciprocating test machine may preferably include an even number of specimen clamping assemblies. On this basis, the even number of specimen clamping assemblies are respectively located on the left and right sides of the thrust connecting rod 420, and the number of specimen clamping assemblies located on the left side of the thrust connecting rod 420 is equal to the number of specimen clamping assemblies located on the right side of the thrust connecting rod 420. Specifically, taking this embodiment as an example, the reciprocating test machine includes two specimen clamping assemblies, and the two specimen clamping assemblies are respectively located on the left and right sides of the thrust connecting rod 420. In other embodiments, when the number of specimen clamping assemblies is multiple, they may all be located only on one of the left and right sides of the thrust connecting rod 420, or the number of specimen clamping assemblies located on the left side of the thrust connecting rod 420 may not be equal to the number of specimen clamping assemblies located on the left side of the thrust connecting rod 420, which is not limited to this embodiment.

[0076] Preferably, when the reciprocating test machine includes three or more specimen clamping assemblies, these specimen clamping assemblies can be preferably arranged uniformly in the lateral direction. On this basis, when the reciprocating test machine includes four or more specimen clamping assemblies, and when the number of these specimen clamping assemblies is equally distributed on the left and right sides of the thrust connecting rod 420, it can be preferably ensured that the spacing of the multiple specimen clamping assemblies on each side is uniform, and the spacing between the specimen clamping assemblies on both sides can be different, for example, slightly wider in the lateral direction, so as to facilitate the arrangement of the loading device and other structures, which are not limited to this embodiment.

[0077] Preferably, if Figure 1 and Figure 4As shown, in this embodiment, the thrust balancing device 310 may preferably be in a trapezoidal shape, so that the lateral dimension of the front end of the thrust balancing device 310 is greater than the lateral dimension of the rear end thereof. On this basis, the connecting arm 311 is the front end of the thrust balancing device 310. In other words, the thrust balancing device 310 in a trapezoidal shape has two "bottom sides" with different widths in the lateral direction, and the width of the "bottom side" located at the front side is larger, that is, the connecting arm 311 or includes the connecting arm 311. In other embodiments, the thrust balancing device 310 may also be in other shapes, such as a triangle, etc., and is not limited to this embodiment.

[0078] Preferably, if Figure 1 As shown, in the present embodiment, the thrust connecting rod 420 is passed through the thrust balancing device 310, and a thrust bearing 710 may preferably be provided between the thrust balancing device 310 and the thrust connecting rod 420, so as to locate the relative positions of the thrust balancing device 310 and the thrust connecting rod 420 in the center line direction of the thrust connecting rod 420, and to ensure that the thrust connecting rod 420 can rotate flexibly relative to the thrust balancing device 310.

[0079] Preferably, if Figure 1 As shown, in this embodiment, the orthographic projection figure of the thrust balancing device 310 on the base 120 can be preferably an axisymmetric figure, and the axis of symmetry of the axisymmetric figure is the center line of the thrust connecting rod 420. On this basis, taking the thrust balancing device 310 in a trapezoidal shape as an example, the thrust connecting rod 420 passes through the middle position of the two "bottom edges". Through the above structural design, the forces of the multiple specimen clamping assemblies connected to the thrust balancing device 310 can be more balanced.

[0080] Preferably, in this embodiment, a plurality of connection holes may be provided on the connection arm 311 to respectively connect a plurality of chuck connection rods 830 .

[0081] Preferably, if Figure 6 and Figure 7As shown, in this embodiment, each specimen clamping assembly can preferably include a plurality of oil boxes, which can be selectively placed outside the specimen clamping assembly to achieve the bearing of different types of oil to be tested or to meet different test requirements. Among them, the plurality of oil boxes at least include a rectangular oil box 331 and a circular oil box 332, and the circular oil box 332 is provided with a cooling cavity 3321 for accommodating coolant. The cooling cavity 3321 is connected to an external cold source, such as a constant temperature circulating cooling water bath, and can control the temperature of the oil to be tested, so as to achieve low-temperature testing and improve the test safety of volatile liquids. Among them, the square oil box can be used to measure the lubrication performance of non-volatile liquids, such as diesel, marine fuel, lubricating oil, etc., and the circular oil box 332 can be used to measure the lubrication performance of volatile liquids, such as gasoline, etc. Through the above design, the present invention adopts an oil box with a special structure, and cooperates with low-temperature control technology to achieve the detection of low-temperature lubrication performance of gasoline, and has high safety. In other embodiments, when the specimen clamping assembly includes a plurality of selectively arranged oil boxes, these oil boxes may also include other shapes, and the shapes of the plurality of oil boxes are preferably different, and include at least one oil box having a cooling cavity 3321 capable of accommodating coolant, which is not limited to this embodiment.

[0082] Furthermore, based on the design that the circular oil box 332 can be used to measure the lubrication performance of volatile liquids, in this embodiment, the circular oil box 332 can preferably be provided with an openable and closable box cover, thereby reducing the volatilization of the volatile liquid in the circular oil box 332.

[0083] Preferably, if Figure 1 and Figure 2 As shown, in this embodiment, the displacement measurement component may preferably include a laser displacement sensor 340 and a laser signal reflection sheet 220. Specifically, the laser displacement sensor 340 is disposed on the base 120. The laser signal reflection sheet 220 is disposed on the thrust connecting rod 420 and is arranged relative to the laser displacement sensor 340 in the front-rear direction. Accordingly, the laser displacement sensor 340 is configured to send a laser signal to the laser signal reflection sheet 220, and the laser signal is reflected by the laser signal reflection sheet 220. The laser displacement sensor 340 absorbs the reflected laser signal and converts it into a digital signal, and sends the digital signal to the control system, so that the control system can measure the amplitude of the vibration direction of the thrust motion component, and the measurement displacement repeatability accuracy can reach 1μm. Through the above design, the present invention uses a high-precision and high-stability laser displacement sensor 340 to monitor the displacement, and the measurement digital signal generated by the laser displacement sensor 340 does not need to be processed, and can be directly used by the automatic control system, which has the advantages of advanced measurement technology and stable performance.

[0084] Furthermore, based on the structural design that the displacement measurement component includes the laser displacement sensor 340 , in this embodiment, the laser displacement sensor 340 may preferably be disposed on the base 120 via a bracket.

[0085] Preferably, if Figure 2 and Figure 5 As shown, in this embodiment, the elastic bracket 320 can be preferably processed as an integral structure, and on this basis, the bending position (for example, the 90° bending position) of the elastic bracket 320 can be preferably provided with a bending groove 321, so that the thickness of the bending position of the elastic bracket 320 is smaller than the thickness of other positions. Through the above structural design, the elasticity of the elastic bracket 320 can be improved, thereby improving the measurement sensitivity of the friction force measurement sensor 430.

[0086] Preferably, if Figures 1 to 3 As shown, in this embodiment, the reciprocating test machine proposed by the present invention further includes a plurality of temperature control measurement components, which are respectively arranged between the plurality of elastic brackets 320 and the plurality of oil boxes, so as to respectively fix the plurality of oil boxes and respectively heat the plurality of oil samples. Each temperature control measurement component may preferably include a heating platform 510, a heating element and a temperature measurement sensor 520. Specifically, the heating platform 510 is arranged on the elastic bracket 320, and the oil box is detachably arranged on the heating platform 510, so as to be arranged on the elastic bracket 320 through the heating platform 510. The heating element is arranged in the heating platform 510. The temperature measurement sensor 520 is connected to the heating platform 510.

[0087] Furthermore, if Figure 8 and Fig. 9 As shown, based on the structural design that the temperature control measurement component includes a heating platform 510, in this embodiment, a receiving groove is provided on the top of the heating platform 510, and the oil box is detachably arranged in the receiving groove. On this basis, the heating platform 510 can preferably be provided with an inclined positioning hole 511, and the positioning hole 511 passes through the side wall of the heating platform 510 and the groove wall of the receiving groove. The heating platform 510 can position the oil box by a positioning member (such as a positioning bolt) penetrating the positioning hole 511, and the oil box and the heating platform 510 are relatively fixed.

[0088] Further, based on the structural design of the temperature control measurement component including the heating element, in this embodiment, the heating element can preferably be a heating rod 610, such as a metal heating rod, a ceramic heating rod, etc., and is not limited to this embodiment. In addition, preferably, the heating power of the heating rod 610 can be preferably greater than 40W.

[0089] Preferably, if Figure 1 and Figure 2As shown, in this embodiment, each friction measurement assembly includes a friction measurement sensor 430 and a friction connection rod 410. Specifically, the friction measurement sensor 430 is disposed on the base 120. The friction connection rod 410 is connected between the friction sensor and the heating platform 510. During the measurement test, the friction generated by the contact between the upper test piece and the lower test piece can be transmitted to the friction measurement sensor 430 through the heating platform 510, so as to measure the contact friction between multiple pairs of upper test pieces and lower test pieces respectively.

[0090] Furthermore, based on the structural design that the friction force measurement component includes a friction force sensor, in this embodiment, the friction force sensor can preferably be disposed on the base 120 via a bracket.

[0091] Furthermore, based on the structural design that the friction force measurement component includes a friction force sensor, in this embodiment, the friction force measurement sensor 430 can preferably adopt a quartz crystal tension and pressure sensor, which has high measurement sensitivity and accuracy.

[0092] Preferably, if Figure 1 and Figure 2 As shown, in this embodiment, the vibrator 210 is arranged on the base 120 through the bearing seat 130 assembly, so that the vibrator 210 can rotate relative to the base 120 in the vertical direction. Specifically, the bearing seat 130 assembly includes two bearing seats 130 and two bearings 131. The two bearing seats 130 are arranged on the base 120 and are respectively located on both sides of the vibrator 210. The two bearings 131 are respectively connected between the two bearing seats 130 and the two sides of the vibrator 210.

[0093] Furthermore, based on the structural design that the vibrator 210 is arranged on the base 120 through the bearing seat 130 assembly, in this embodiment, the bearing seat 130 assembly may also preferably include two cushion blocks. Specifically, the two cushion blocks are respectively arranged between the two bearing seats 130 and the base 120, that is, the bearing seat 130 is arranged on the base 120 through the cushion blocks.

[0094] Preferably, if Figure 3 As shown, in this embodiment, the loading assembly includes a weight 810. The weight 810 is hung below the front end of the thrust connecting rod 420 through a hanging rope 820.

[0095] Preferably, in this embodiment, the base 120 may preferably have a larger mass. For example, the larger mass may be understood as the mass of the base 120 being approximately equal to 30 to 50 times the mass of the motion component of the reciprocating test machine. The so-called "motion component" generally includes the above-mentioned exciter 210, thrust connecting rod 420, etc.

[0096] Preferably, if Figures 1 to 3As shown, in this embodiment, a plurality of legs 110 are provided at the bottom of the base 120. On this basis, the legs 110 can preferably be an adjustable structure, so as to adjust the level of the base 120 and ensure the level stability of the entire device.

[0097] Preferably, in this embodiment, the material of the thrust connecting rod 420 may preferably include a titanium alloy material, thereby reducing the motion mass of the thrust connecting rod 420 and other motion components, increasing the structural strength of the thrust connecting rod 420, and reducing the stick-slip motion generated by the micro-motion test.

[0098] Preferably, in this embodiment, the material of the thrust balancing device 310 may preferably include titanium alloy material or aluminum alloy material, thereby reducing the moving mass of the moving component.

[0099] Preferably, in this embodiment, the reciprocating test machine proposed in the present invention further includes a control system, which is connected to various sensors such as the laser displacement sensor 340 and other functional components. Accordingly, the control system can automatically measure and control the reciprocating vibration frequency, displacement, temperature of the test oil sample and test time of the upper test piece.

[0100] It should be noted here that the reciprocating testing machines shown in the drawings and described in this specification are only a few examples of the many types of reciprocating testing machines that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any details of the reciprocating testing machines shown in the drawings or described in this specification or any components of the reciprocating testing machines.

[0101] Based on the above detailed description of an exemplary embodiment of the reciprocating testing machine proposed in the present invention, an exemplary embodiment of the lubrication performance testing method proposed in the present invention will be described below.

[0102] In this embodiment, the present invention proposes a lubrication performance test method, which can be used to test the lubrication performance of the oil to be tested. Specifically, the lubrication performance test method proposed by the present invention includes the following steps:

[0103] A reciprocating test machine is provided, comprising a base, an exciter, a thrust connecting rod, a loading assembly, a displacement measuring assembly, a plurality of groups of specimen clamping assemblies and a plurality of groups of friction measuring assemblies, wherein the exciter is arranged on the base, the rear end of the thrust connecting rod is connected to the exciter, the loading assembly is connected to the front end of the thrust connecting rod, the displacement measuring assembly is arranged between the base and the thrust connecting rod, a thrust balancing device is arranged at the rear end of the thrust connecting rod, the thrust balancing device has a connecting arm, the connecting arm is arranged in a lateral direction perpendicular to the thrust connecting rod, a plurality of groups of specimen clamping assemblies are respectively arranged on the base and arranged in a lateral direction at intervals, each specimen clamping assembly comprises an oil box and an upper specimen chuck, the oil box is arranged on the base through an elastic bracket, the upper specimen chuck is connected to the connecting arm through a chuck connecting rod, the chuck connecting rod is parallel to the thrust connecting rod and extends backwards, so that the upper specimen chuck is located above the oil box, and a plurality of groups of friction measuring assemblies are respectively connected to a plurality of oil boxes;

[0104] A plurality of lower test pieces are respectively arranged in the plurality of oil boxes, and a plurality of upper test pieces are clamped by a plurality of upper test piece clamps respectively;

[0105] Pour the oil to be tested into multiple oil boxes respectively, and immerse the lower test piece in the oil to be tested;

[0106] Move the upper specimen chuck to make the upper specimen contact with the lower specimen;

[0107] The exciter is used to drive multiple groups of specimen clamping assemblies to simulate vibration through the thrust connecting rod, so as to generate simulated friction between the upper specimen and the lower specimen;

[0108] The displacement measuring assembly is used to measure the stroke and frequency of the simulated vibration, and the friction force between the upper test piece and the lower test piece is measured using the friction force measuring assembly;

[0109] The lubrication performance of the oil to be tested is calculated based on the stroke and frequency of the simulated vibration and the friction between the upper test piece and the lower test piece.

[0110] Through the above design, the lubrication performance testing method proposed by the present invention can simultaneously test multiple oils to be tested, and has high test efficiency.

[0111] Optionally, in this embodiment, for the step of "providing a reciprocating testing machine", the reciprocating testing machine proposed by the present invention and described in detail in the above embodiment can be selected. In other embodiments, other reciprocating testing machines that can meet the functional structure requirements of the reciprocating testing machine in the above step description can also be used, and are not limited to this embodiment.

[0112] Optionally, in this embodiment, the oil to be tested is poured into each oil box as an example for description, that is, each upper test piece chuck clamps an upper test piece, and each oil box is provided with a lower test piece as an example for description. In other embodiments, the oil to be tested may be poured into only a portion of the multiple oil boxes, such as three of the five oil boxes, and the corresponding positions and corresponding numbers of upper test piece chucks are selected accordingly, and this embodiment is not limited thereto.

[0113] Optionally, in this embodiment, the multiple oils to be tested may be of the same type, or may be of different types, or may be completely different types. Accordingly, when the multiple oils to be tested are of the same type, the test method proposed in the present invention can be used to simultaneously test and obtain multiple sets of experimental data on the type of oil to be tested, thereby eliminating the cumbersome test process of repeated tests and further improving the efficiency of the lubrication performance test. Furthermore, when the multiple oils to be tested are of different types, or completely different types, the test method proposed in the present invention can be used to test multiple different types of oils to be tested. In particular, this test method can be applicable to the selection of multiple oils under similar wear environments.

[0114] It should be noted that the lubrication performance test methods described in this specification are only a few examples of the many test methods that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the lubrication performance test methods shown in the drawings or described in this specification.

[0115] In summary, the present invention proposes a reciprocating testing machine and a lubrication performance testing method, which have the ability to detect the lubrication performance of liquid petroleum products such as diesel, gasoline, aviation kerosene, and marine fuel. Through the above-mentioned structural design, the present invention can detect multiple samples at the same time and has a high test efficiency. In addition, the present invention adopts a laser measurement displacement sensor, which can improve the vibration amplitude control accuracy, and the displacement repeatability accuracy can reach 1um. Furthermore, the present invention adopts an elastic bracket with an optimized structure, which can improve the sensitivity of the friction force measurement signal and has better stability. In addition, the heating temperature control fluctuation of the present invention is small, and the accuracy can reach 0.1°C.

[0116] The above describes and / or illustrates in detail an exemplary embodiment of the reciprocating test machine and lubrication performance test method proposed by the present invention. However, the embodiments of the present invention are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described herein. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprise", "include" and "have" are used to indicate an open-ended inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc.

[0117] Although the reciprocating testing machine and lubrication performance testing method proposed in the present invention have been described according to different specific embodiments, those skilled in the art will recognize that the implementation of the present invention can be modified within the spirit and scope of the claims.

Claims

1. A reciprocating testing machine, comprising a base, an exciter, a thrust connecting rod, a loading assembly and a displacement measuring assembly, wherein the exciter is arranged on the base, the rear end of the thrust connecting rod is connected to the exciter, the loading assembly is connected to the front end of the thrust connecting rod, and the displacement measuring assembly is arranged between the base and the thrust connecting rod; characterized in that: A thrust balancing device is provided at the rear end of the thrust connecting rod, and the thrust balancing device has a connecting arm, and the connecting arm is arranged in a transverse direction perpendicular to the thrust connecting rod; The reciprocating testing machine also includes multiple groups of specimen clamping components and multiple groups of friction force measuring components; The multiple groups of test specimen clamping assemblies are respectively arranged on the base and arranged at intervals in the transverse direction, each of the test specimen clamping assemblies comprises an oil box and an upper test specimen chuck, the oil box is arranged on the base through an elastic bracket and can be provided with a lower test specimen and oil to be tested, the upper test specimen chuck is connected to the connecting arm through a chuck connecting rod and can clamp an upper test specimen, the chuck connecting rod is parallel to the thrust connecting rod and extends backward, so that the upper test specimen chuck is located above the oil box; The multiple groups of friction force measurement components are respectively connected to the multiple oil boxes; Each of the specimen clamping assemblies comprises a plurality of the oil boxes, the plurality of oil boxes are configured to be selectively arranged, the plurality of oil boxes have different shapes, at least one of the plurality of oil boxes has a cooling cavity inside for accommodating a coolant, and the plurality of oil boxes of each of the specimen clamping assemblies comprises at least a rectangular oil box and a circular oil box, and the circular oil box has the cooling cavity; Among them, the displacement measurement component includes a laser displacement sensor and a laser signal reflection plate, the laser displacement sensor is arranged on the base, the laser signal reflection plate is arranged on the thrust connecting rod, and is arranged opposite to the laser displacement sensor in the front-to-back direction, and the laser displacement sensor is configured to emit a laser signal to the laser signal reflection plate, and measure the vibration amplitude of the thrust connecting rod based on the laser signal reflected back by the laser signal reflection plate.

2. The reciprocating testing machine according to claim 1, characterized in that: The reciprocating testing machine comprises an even number of the specimen clamping assemblies, which are respectively located on the left and right sides of the thrust connecting rod, and the number of the specimen clamping assemblies located on the left side of the thrust connecting rod is equal to the number of the specimen clamping assemblies located on the right side of the thrust connecting rod.

3. The reciprocating testing machine according to claim 1, characterized in that: The plurality of specimen clamping assemblies are evenly spaced and arranged.

4. The reciprocating testing machine according to claim 1, characterized in that: The thrust balancing device is triangular or trapezoidal, so that the transverse dimension of the front end of the thrust balancing device is greater than the transverse dimension of the rear end thereof, and the connecting arm is the front end of the thrust balancing device.

5. The reciprocating testing machine according to claim 1, characterized in that: The thrust connecting rod is passed through the thrust balancing device, and a thrust bearing is arranged between the thrust balancing device and the thrust connecting rod.

6. The reciprocating testing machine according to claim 1, characterized in that: The orthographic projection figure of the thrust balancing device on the base is an axisymmetric figure, and the axis of symmetry of the axisymmetric figure is the center line of the thrust connecting rod.

7. The reciprocating testing machine according to claim 1, characterized in that: The elastic bracket is processed as an integral structure, and a bending groove is provided at a bending position of the elastic bracket, so that the thickness of the bending position of the elastic bracket is smaller than that of other positions.

8. The reciprocating testing machine according to claim 1, characterized in that: The reciprocating testing machine further comprises a plurality of temperature control and measurement components respectively arranged between the plurality of elastic supports and the plurality of oil boxes, each of the temperature control and measurement components comprising: A heating platform, arranged on the elastic bracket, wherein the oil box is detachably arranged on the heating platform so as to be arranged on the elastic bracket through the heating platform; A heating element is disposed in the heating platform; as well as A temperature measurement sensor is connected to the heating platform.

9. The reciprocating testing machine according to claim 8, characterized in that: A receiving groove is provided on the top of the heating platform, and the oil box is detachably arranged in the receiving groove; wherein, the heating platform is provided with an inclined positioning hole, and the positioning hole passes through the side wall of the heating platform and the groove wall of the receiving groove, and the heating platform is configured to position the oil box by a positioning piece passing through the positioning hole.

10. The reciprocating testing machine according to claim 8, characterized in that: Each of the friction force measurement components comprises: A friction force measurement sensor, disposed on the base; and The friction force connecting rod is connected between the friction force sensor and the heating platform.

11. The reciprocating testing machine according to claim 1, characterized in that: The exciter is arranged on the base through a bearing seat assembly so that the exciter can rotate relative to the base in a vertical direction. The bearing seat assembly comprises: Two bearing seats are arranged on the base and are respectively located on both sides of the exciter; and Two bearings are respectively connected between the two bearing seats and the two sides of the exciter.

12. The reciprocating testing machine according to claim 1, characterized in that: The loading component comprises: The weight is hung below the front end of the thrust connecting rod through a hanging rope.

13. A lubrication performance testing method for testing the lubrication performance of an oil to be tested, characterized in that: The following steps are involved: A reciprocating testing machine is provided, comprising a base, an exciter, a thrust connecting rod, a loading assembly, a displacement measuring assembly, a plurality of groups of specimen clamping assemblies and a plurality of groups of friction force measuring assemblies, wherein the exciter is arranged on the base, the rear end of the thrust connecting rod is connected to the exciter, the loading assembly is connected to the front end of the thrust connecting rod, the displacement measuring assembly is arranged between the base and the thrust connecting rod, a thrust balancing device is arranged at the rear end of the thrust connecting rod, the thrust balancing device has a connecting arm, and the connecting arm is arranged in a transverse direction perpendicular to the thrust connecting rod, the plurality of groups of specimen clamping assemblies are respectively arranged on the base and arranged in a transverse direction at intervals, each of the specimen clamping assemblies comprises an oil box and an upper specimen chuck, the oil box is arranged on the base through an elastic bracket, the upper specimen chuck is connected to the connecting arm through a chuck connecting rod, the chuck connecting rod is parallel to the thrust connecting rod and extends backward, so that the upper specimen chuck is located in the oil box. The plurality of groups of friction force measurement components are connected to the plurality of oil boxes respectively above the box; wherein each of the specimen clamping components comprises a plurality of the oil boxes, the plurality of oil boxes are configured to be selectively arranged, the plurality of oil boxes are of different shapes, at least one of the plurality of oil boxes is provided with a cooling cavity inside to accommodate coolant, and the plurality of oil boxes of each of the specimen clamping components at least comprises a rectangular oil box and a circular oil box, the circular oil box being provided with the cooling cavity; wherein the displacement measurement component comprises a laser displacement sensor and a laser signal reflection sheet, the laser displacement sensor being arranged on the base, the laser signal reflection sheet being arranged on the thrust connecting rod and being arranged opposite to the laser displacement sensor in the front-rear direction, the laser displacement sensor being configured to send a laser signal to the laser signal reflection sheet, and measure the vibration amplitude of the thrust connecting rod according to the laser signal reflected back by the laser signal reflection sheet; A plurality of lower test pieces are respectively arranged in the plurality of oil boxes, and a plurality of upper test pieces are clamped by the plurality of upper test piece clamps respectively; Pour the oil to be tested into the multiple oil boxes respectively, and immerse the lower test piece in the oil to be tested; Moving the upper specimen chuck to bring the upper specimen into contact with the lower specimen; Using the vibration exciter to drive the multiple groups of specimen clamping assemblies to perform simulated vibration through the thrust connecting rod, so that the upper specimen and the lower specimen generate simulated friction; Using the displacement measurement component to measure the stroke and frequency of the simulated vibration, and using the friction measurement component to measure the friction between the upper test piece and the lower test piece; The lubrication performance of the oil to be tested is calculated based on the stroke and frequency of the simulated vibration and the friction between the upper test piece and the lower test piece.

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