Cylinder liner pull-out force correction method and test system

Abstract

The invention relates to the technical field of plunger pumps, in particular to a cylinder liner pull-out force correction method and a test system. The method includes establishing a sample model based on sample size parameters of the plunger pump assembly. And on the basis of completion of establishment of the sample model, obtaining simulation pull-out force data Y1 and test pull-out force data Y2. And obtaining a first prediction formula based on the simulation pull-out force data Y1 and the test pull-out force data Y2. And obtaining a second prediction formula based on the first prediction formula and the sample model. And obtaining a correction formula based on the second prediction formula and the sample model. And based on the correction formula and the actual size parameters of the plunger pump assembly, predicted pull-out force data are obtained. Therefore, the problem of how to reduce the error between the simulated pull-out force and the actual pull-out force is solved.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps, and in particular to a cylinder liner pull-out force correction method and a test system. Background Art

[0002] The plunger pump is mainly composed of the plunger, cylinder, bushing and other parts. Since the plunger reciprocates in the cylinder, it is necessary to install a wear-resistant bushing in the plunger cavity of the cylinder to extend the service life of the plunger pump. The bushing of the plunger pump is generally pressed into the plunger cavity of the cylinder by cold extrusion. After the cold extrusion is completed, a press-release test is required to test the release force to ensure the strength and reliability of the cold extrusion. The release force is measured by destructive testing of the bushing using a tensile testing machine and tooling.

[0003] The structure of the cylinder body and bushing of the existing plunger pump before cold extrusion is mainly determined by the experience of closing processing. There are many types of cylinder bodies and bushings, and it is difficult to determine the structural reliability of the cylinder bushing after cold extrusion based on experience alone. The error between the simulated ejection force data obtained by using simulation software to simulate the ejection force of the cylinder bushing and the actual ejection force data obtained by the compression test is large, making it difficult for the simulated ejection force data to reflect the reliability of the cylinder bushing structure. This empirical design method and post-design verification cost is high and the process is complicated, which is not conducive to the rapid development of plunger pumps and affects the efficiency of design and development. Summary of the invention

[0004] In order to solve the problem of how to reduce the error between the simulated ejection force and the actual ejection force, the present invention provides a cylinder liner ejection force correction method and a test system.

[0005] In a first aspect, the present invention provides a cylinder liner pull-out force correction method, the cylinder liner pull-out force correction method comprising:

[0006] Step S10, establishing a sample model based on the sample size parameters of the plunger pump assembly; wherein the sample model includes thickness data A, height data B, interference data C, and width data D; data of A, B, C, and D are all obtained within a set range;

[0007] Step S20, based on the completion of the sample model establishment, obtaining the simulated pull-out force data Y1 and the experimental pull-out force data Y2;

[0008] Step S30, based on the simulated escape force data Y1 and the experimental escape force data Y2, obtain a first prediction formula; wherein, the first prediction formula is: Y1=M1+K1×A+K2×B+K3×C+K4×D, Y2=N1+J1×A+J2×B+J3×C+J4×D; M1 and N1 are constants, K1, K2, K3, and K4 are respectively the first simulation coefficient, the second simulation coefficient, the third simulation coefficient, and the fourth simulation coefficient, and J1, J2, J3, and J4 are respectively the first test coefficient, the second test coefficient, the third test coefficient, and the fourth test coefficient;

[0009] Step S40, based on the first prediction formula and the sample model, obtain a second prediction formula; wherein the second prediction formula is: Y 1，REVISE =M2+K2×B+K4×D,Y 2，REVISE =N2+J2×B+J3×C; M2 and N2 are both constants;

[0010] Step S50, based on the second prediction formula and the sample model, obtain a correction formula; wherein the correction formula is: Y3=Y 1，REVISE + (J2-K2) × B + J3 × C + (N2-M2) - Z; Z is the compensation parameter;

[0011] Step S60, based on the correction formula, the actual dimensional parameters of the plunger pump assembly, and the simulated ejection force data, the predicted ejection force data is obtained; wherein the actual dimensional parameters include height data B and interference data C; B and C are obtained within a set range.

[0012] In some embodiments, step S10 includes:

[0013] Step S11, obtaining a solid model based on the sample size parameters of the plunger pump assembly;

[0014] Step S12, based on the completion of the acquisition of the solid model, respectively acquire thickness data A, height data B, interference data C, and width data D; wherein the thickness data A takes a value within the thickness range, the height data B takes a value within the height range, the interference data C takes a value within the interference range, and the width data D takes a value within the width range;

[0015] Step S13, establishing a simulation model based on the thickness data A, the height data B, the interference data C, and the width data D; wherein the sample model includes the simulation model and the physical model.

[0016] In some embodiments, the thickness in step S12 ranges from 1 mm to 1.3 mm; the height ranges from 0.3 mm to 0.45 mm; the interference ranges from 0.005 mm to 0.02 mm; and the width ranges from 5 mm to 5.6 mm.

[0017] In some embodiments, step S40 includes:

[0018] Step S41, based on the first prediction formula and the sample model, obtain the P1 value corresponding to the simulated pull-out force data Y1 and the P2 value corresponding to the test pull-out force data Y2; wherein the P1 value includes the P2 value corresponding to the thickness data A. A1 value, the height data B corresponding to P B1 value, the P corresponding to the interference data C1 value, the width data D corresponding to P D1 The P2 value includes the P corresponding to the thickness data A. A2 value, the height data B corresponding to P B2 value, the P corresponding to the interference data C2 value, the width data D corresponding to P D2 value;

[0019] Step S42, based on the P A1 value, the P C1 The values ​​are all greater than the first set threshold, the P A2 value, the P D2 The values ​​are all greater than the second set threshold, and the second prediction formula is obtained; wherein the second prediction formula is: 1，REVISE =M2+K2×B+K4×D,Y 2，REVISE =N2+J2×B+J3×C; M2 and N2 are both constants.

[0020] In some embodiments, step S50 includes:

[0021] Step S51, based on the second prediction formula and the sample model, obtain the P3 value corresponding to the simulated escape force data Y1 and the P4 value corresponding to the experimental escape force data Y2; wherein the P3 value includes the P4 value corresponding to the height data B. B3 value, the width data corresponding to P D3 The P4 value includes the P corresponding to the height data B B4 value, the interference data C corresponding to P C4 value;

[0022] Step S52, based on the P D3 The value is greater than the third set threshold, and a correction formula is obtained; wherein the correction formula is: Y3=Y1，REVISE +(J2-K2)×B+J3×C+(N2-M2)-Z; Z=0.

[0023] In some embodiments, step S50 includes:

[0024] Step S54: based on the second prediction formula, the sample model, and the P D3 The value is less than or equal to the third set threshold, and a correction formula is obtained; wherein the correction formula is: Y3=Y 1，REVISE +(J2-K2)×B+J3×C+(N2-M2)-Z; Z=K4×D.

[0025] In some embodiments, step S20 includes:

[0026] Step S21, running the simulation component based on the sample model being established;

[0027] Step S22, based on the completion of the operation of the simulation component, obtaining the simulated pull-out force data Y1;

[0028] Step S23, based on the completion of the establishment of the sample model, performing a disengagement test on the plunger pump assembly;

[0029] Step S24, performing a disengagement test based on the plunger pump assembly to obtain test disengagement force data Y2.

[0030] In some embodiments, step S24 includes:

[0031] Step S241, performing a disengagement test on the plunger pump assembly, positioning and fixing the plunger pump assembly on a test bench and controlling a pressurizing unit to abut against a bushing unit of the plunger pump assembly;

[0032] Step S242, based on the contact between the pressurizing unit and the bushing unit, controlling the pressurizing unit to continue to move toward the bushing unit at a set speed and a set distance;

[0033] Step S243, based on the pressurizing unit moving a set distance toward the bushing unit and maintaining the movement for a set time, the maximum force borne by the bushing unit is obtained as the test disengagement force data Y2.

[0034] In some embodiments, the set speed in step S242 is 2 mm / min; the set distance is 20 mm; and the set time in step S243 is 10 min.

[0035] In a second aspect, the present invention provides a test system, which is applied to a cylinder liner pull-out force correction method described in any one of the above embodiments, and the test system comprises:

[0036] A plunger pump assembly, the plunger pump assembly comprises a cylinder unit and a bushing unit; the cylinder unit comprises a cylinder body and a boss groove; a cavity with an opening at one end is formed in the cylinder body; a boss groove is provided on the inner side wall of the cylinder body; the bushing unit comprises a bushing ring and a boss ring; two bushing rings are fixedly connected to the two ends of the boss ring respectively; the outer circumference of the bushing ring is interference fit with the inner circumference of the cylinder body;

[0037] The boss ring comprises a first ring portion, a second ring portion and a third ring portion; the first ring portion, the second ring portion and the third ring portion are fixedly connected in sequence; one end of the first ring portion away from the second ring portion is fixedly connected to the bushing ring; one end of the third ring portion away from the second ring portion is fixedly connected to the bushing ring; the cross-sectional area of ​​the first ring portion gradually decreases from one end close to the second ring portion to the other end; the cross-sectional area of ​​the third ring portion gradually decreases from one end close to the second ring portion to the other end;

[0038] The plunger pump assembly also includes a first state and a second state; in the first state, the inner diameter of the second ring portion is smaller than the inner diameter of the bushing ring, the outer diameter of the second ring portion is the same as the outer diameter of the bushing ring, and the outer peripheral wall of the second ring portion is spaced apart from the groove bottom of the boss groove; in the second state, the inner diameter of the second ring portion is the same as the inner diameter of the bushing ring, the outer diameter of the second ring portion is larger than the outer diameter of the bushing ring, the outer peripheral wall of the second ring portion abuts against the groove bottom of the boss groove, and the outer peripheral walls of the first ring portion and the third ring portion abut against the peripheral side walls of the boss groove respectively;

[0039] A test assembly, the test assembly comprising a test bench and a pressurizing unit; one end of the pressurizing unit is detachably connected to the test bench;

[0040] A simulation component, the simulation component is used to perform simulation calculations on the plunger pump component and obtain simulated ejection force data;

[0041] The test system also includes a disengagement test state; the disengagement test state includes the test bench positioning and fixing the cylinder body, and the pressurizing unit moving toward the direction approaching the bushing ring.

[0042] In order to solve the problem of how to reduce the error between the simulated ejection force and the actual ejection force, the present invention has the following advantages:

[0043] A limited number of sample models are established through the sample size parameters of the plunger pump assembly to obtain simulated ejection force data and test ejection force data, and then fit the first prediction formula and the second prediction formula. Finally, a correction formula is fitted, so that the predicted ejection force data can be calculated by combining the correction formula with relevant parameters, thereby reducing the test process, reducing the test cost, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of a cylinder liner pull-out force correction method according to an embodiment is shown;

[0045] Figure 2 A schematic diagram of the detection of a test assembly and a plunger pump assembly according to an embodiment is shown;

[0046] Figure 3 A schematic diagram showing a bushing unit and a cylinder unit of a plunger pump assembly before processing according to an embodiment;

[0047] Figure 4 A schematic diagram showing a processed bushing unit and a cylinder unit of a plunger pump assembly according to an embodiment;

[0048] Figure 5 A schematic diagram showing a law of variation of the force to which a plunger pump assembly in an embodiment is subjected during a breakout test is shown.

[0049] Figure numerals: 01 plunger pump assembly; 11 cylinder unit; 111 cylinder body; 112 boss groove; 12 bushing unit; 121 bushing ring; 122 boss ring; 1221 first ring portion; 1222 second ring portion; 1223 third ring portion; 02 test assembly; 21 test bench; 22 pressurizing unit. DETAILED DESCRIPTION

[0050] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0051] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0052] In this embodiment, if Figure 2 As shown, the plunger pump assembly 01 includes a cylinder unit 11 and a bushing unit 12. Figure 3 , Figure 4 As shown, the cylinder unit 11 includes a cylinder body 111 and a boss groove 112. A cavity with an open end is formed in the cylinder body 111. The boss groove 112 is provided on the inner side wall of the cylinder body 111. The bushing unit 12 includes a bushing ring 121 and a boss ring 122. The two bushing rings 121 are fixedly connected to the two ends of the boss ring 122 respectively. The outer peripheral side of the bushing ring 121 is interference fit with the inner peripheral wall of the cylinder body 111.

[0053] The boss ring 122 includes a first ring portion 1221, a second ring portion 1222, and a third ring portion 1223. The first ring portion 1221, the second ring portion 1222, and the third ring portion 1223 are fixedly connected in sequence. One end of the first ring portion 1221 away from the second ring portion 1222 is fixedly connected to the bushing ring 121. One end of the third ring portion 1223 away from the second ring portion 1222 is fixedly connected to the bushing ring 121. The cross-sectional area of ​​the first ring portion 1221 gradually decreases from one end close to the second ring portion 1222 to the other end. The cross-sectional area of ​​the third ring portion 1223 gradually decreases from one end close to the second ring portion 1222 to the other end. The plunger pump assembly 01 also includes a first state and a second state. As Figure 3 As shown, in the first state, the inner diameter of the second ring portion 1222 is smaller than the inner diameter of the bushing ring 121, the outer diameter of the second ring portion 1222 is the same as the outer diameter of the bushing ring 121, and the outer peripheral wall of the second ring portion 1222 is spaced from the bottom of the boss groove 112. Figure 4 As shown, in the second state, the inner diameter of the second ring portion 1222 is the same as the inner diameter of the bushing ring 121, the outer diameter of the second ring portion 1222 is larger than the outer diameter of the bushing ring 121, the outer peripheral wall of the second ring portion 1222 abuts against the bottom of the boss groove 112, and the outer peripheral walls of the first ring portion 1221 and the third ring portion 1223 abut against the peripheral side walls of the boss groove 112 respectively.

[0054] The bushing unit 12 is pressed into the cylinder unit 11 by cold extrusion. After the cold extrusion is completed, a press-release test is required to test the release force to ensure the strength and reliability of the cold extrusion. Based on the premise of reducing test costs and improving efficiency, the existing method of obtaining simulated release force data using simulation software and the test release force data obtained by actual tests have a large error, which makes the simulated release force data unable to be directly used as data support to reflect the reliability of the cylinder bushing structure. How to reduce the error between the predicted release force and the actual release force of the bushing is the problem we need to solve. To this end, this embodiment discloses a cylinder bushing release force correction method.

[0055] like Figure 1 As shown, the cylinder liner pull-out force correction method includes steps S10 to S60, and the above steps can be described in detail below:

[0056] Step S10, based on the sample size parameters of the plunger pump assembly 01, a sample model is established. The sample model includes thickness data A, height data B, interference data C, and width data D. Data of A, B, C, and D are all obtained within the set range. Figure 3As shown, the thickness data A may be the difference between the inner diameter and the outer diameter of the bushing ring 121. The height data B may be the difference between the inner diameter of the second ring portion 1222 of the boss ring 122 and the inner diameter of the bushing ring 121. The interference data C may be the interference amount of the interference fit between the outer circumferential wall of the bushing unit 12 and the inner circumferential wall of the cylinder unit 11. The width data D may be the dimension of the boss ring 122 in the axial direction.

[0057] Step S20, based on the completion of the sample model establishment, obtain the simulated pull-out force data Y1 and the experimental pull-out force data Y2.

[0058] Step S30, based on the simulated escape force data Y1 and the test escape force data Y2, obtain the first prediction formula. The first prediction formula is: Y1=M1+K1×A+K2×B+K3×C+K4×D, Y2=N1+J1×A+J2×B+J3×C+J4×D. M1 and N1 are constants, K1, K2, K3, and K4 are the first simulation coefficient, the second simulation coefficient, the third simulation coefficient, and the fourth simulation coefficient, respectively, and J1, J2, J3, and J4 are the first test coefficient, the second test coefficient, the third test coefficient, and the fourth test coefficient, respectively.

[0059] Step S40, based on the first prediction formula and the sample model, obtain a second prediction formula. The second prediction formula is: 1，REVISE =M2+K2×B+K4×D,Y 2，REVISE =N2+J2×B+J3×C. M2 and N2 are both constants.

[0060] Step S50, based on the second prediction formula and the sample model, obtain a correction formula. The correction formula is: Y3=Y 1，REVISE + (J2-K2) × B + J3 × C + (N2-M2) - Z. Z is a compensation parameter used to reduce the error between the predicted breakout force data and the experimental breakout force data.

[0061] Step S60, based on the correction formula, the actual size parameters of the plunger pump assembly 01, and the simulated ejection force data, the predicted ejection force data is obtained. The actual size parameters include height data B and interference data C; B and C are obtained within a set range.

[0062] In some embodiments, 16 groups of sample model data are taken and the above steps are run to obtain the following as shown in Table 1:

[0063] Table 1 - Relationship between sample model, simulated release force and experimental release force

[0064]

[0065] Through the parameters of A, B, C, and D of each group listed in Table 1, simulation and release test are carried out, and regression analysis is performed on the simulated release force data Y1 and the test release force data Y2, so that the first prediction formula can be derived and substituted into the correlation coefficient:

[0066] Y1=M1+K1×A+K2×B+K3×C+K4×D=9089-303A+864B+243C+424D;

[0067] Y2=N1+J1×A+J2×B+J3×C+J4×D=10760-4A+497B+406C+62D.

[0068] The value range of the first simulation coefficient K1 can be between -300±15; the value range of the second simulation coefficient K2 can be between 850±42.5; the value range of the third simulation coefficient K3 can be between 240±12; the value range of the fourth simulation coefficient K4 can be between 420±21. The value range of the first test coefficient J1 can be between -4±0.2; the value range of the second test coefficient J2 can be between 500±25; the value range of the third test coefficient J3 can be between 400±20; the value range of the fourth test coefficient J4 can be between 60±3.

[0069] Subsequently, the first prediction formula can be subjected to variance analysis, and then modified to obtain the second prediction formula and substitute the correlation coefficient:

[0070] Y 1，REVISE =M2+K2×B+K4×D=8939+864B+424D;

[0071] Y 2，REVISE =N2+J2×B+J3×C=10906+497B+406C.

[0072] Then, by modifying and fitting the second prediction formula, according to Y 2，REVISE -Y 1，REVISE Get the corrected formula and substitute it into the correlation coefficient:

[0073] When Z=0, ;

[0074] When Z=K4×D, .

[0075] Finally, the predicted pull-out force data can be obtained by substituting the corresponding data. As shown in Table 2:

[0076] Table 2 - Relationship between sample model, simulated release force, experimental release force, and predicted release force

[0077]

[0078] As can be seen from Table 2, the final correction formula derived through the above steps can reduce the amount of actual size data obtained, reduce the difficulty of calculation, and the error between the predicted breakout force data and the test breakout force data obtained by rapid calculation is at least less than 20%. Therefore, the predicted breakout force data can be used as a reference for the structural reliability of the cylinder unit 11 and the bushing unit 12, thereby reducing the test process, reducing the test cost, and improving production efficiency.

[0079] In this embodiment, step S10 includes:

[0080] Step S11, obtaining a physical model based on the sample size parameters of the plunger pump assembly 01. The physical model can be used to perform a breakout test to advance the derivation process of the first prediction formula and the second prediction formula.

[0081] Step S12, based on the completion of the acquisition of the entity model, respectively acquire thickness data A, height data B, interference data C, and width data D. Among them, the thickness data A is taken within the thickness range, the height data B is taken within the height range, the interference data C is taken within the interference range, and the width data D is taken within the width range. This provides data support for the subsequent fitting derivation formula.

[0082] Step S13, establishing a simulation model based on the thickness data A, the height data B, the interference data C, and the width data D. The sample model includes a simulation model and a physical model.

[0083] Through the above steps, it is convenient to derive the first prediction formula and the second prediction formula through the simulation model to obtain the final correction formula, and the physical model can be used for the breakout test to promote the derivation process of the first prediction formula and the second prediction formula.

[0084] In this embodiment, the thickness in step S12 ranges from 1 mm to 1.3 mm, the height ranges from 0.3 mm to 0.45 mm, the interference ranges from 0.005 mm to 0.02 mm, and the width ranges from 5 mm to 5.6 mm.

[0085] The error between the predicted breakout force data obtained by substituting the data obtained within the above range into the correction formula and the experimental breakout force data can be less than 20%.

[0086] In this embodiment, step S40 includes:

[0087] Step S41, based on the first prediction formula and the sample model, obtain the P1 value corresponding to the simulated release force data Y1 and the P2 value corresponding to the test release force data Y2. The P1 value includes the P2 value corresponding to the thickness data A. A1 Value, height data B corresponding to P B1P corresponding to the value and interference data C1 P corresponding to value and width data D D1 The P2 value includes the P corresponding to the thickness data A. A2 Value, height data B corresponding to P B2 P corresponding to the value and interference data C2 P corresponding to value and width data D D2 value.

[0088] Step S42, based on P A1 Value, P C1 The values ​​are all greater than the first set threshold, P A2 Value, P D2 The values ​​are all greater than the second set threshold, and the second prediction formula is obtained. The second prediction formula is: 1，REVISE =M2+K2×B+K4×D,Y 2，REVISE =N2+J2×B+J3×C. M2 and N2 are both constants.

[0089] In some embodiments, in the process of performing variance analysis on the first prediction formula to derive the second prediction formula according to Table 1, the following may be obtained:

[0090] Table 3 - Variance analysis of simulated and experimental release forces

[0091]

[0092] In Table 3, we use the F statistic and the corresponding degrees of freedom to find the cumulative probability from the F distribution: P = P (F > F observed ); that is, the P value is the probability that the observed F value is more extreme than the theoretical value under given degrees of freedom; the F statistic compares the ratio of the variation between factors (between groups) to the variation within factors (within groups); the P value maps this ratio to a probability value, reflecting the explanatory power of the factor on the response variable.

[0093] The P1 value corresponding to the simulated breakout force data Y1 and the P2 value corresponding to the experimental breakout force data Y2 can be obtained according to the above formula, so as to determine the influence of each data variable (A, B, C, D) in the sample model on the calculation results of Y1 and Y2.

[0094] Through the above steps, we can judge the value of P1 by P A1 Value, P B1 Value, P C1 Value, P D1 Whether each value between the values ​​is greater than the first set threshold; judging whether P in the P2 value A2 Value, P B2 Value, P C2 Value, P D2The first set threshold and the second set threshold can both be 0.05. A1 Value, P C1 Value, P A2 Value, P D2 The data variables corresponding to the respective values ​​are removed from the first prediction formula, thereby obtaining the second prediction formula. Removing unimportant data variables can effectively reduce the amount of calculation and improve efficiency.

[0095] In this embodiment, step S50 includes:

[0096] Step S51, based on the second prediction formula and the sample model, obtain the P3 value corresponding to the simulated escape force data Y1 and the P4 value corresponding to the experimental escape force data Y2. The P3 value includes the P4 value corresponding to the height data B. B3 P corresponding to value and width data D3 The P4 value includes the P corresponding to the height data B. B4 Value, interference data C corresponding to P C4 This will facilitate further simplification of the formula and reduce the amount of calculation.

[0097] Step S52, based on P D3 The value is greater than the third set threshold, and the correction formula is obtained. The correction formula is: Y3=Y 1，REVISE + (J2-K2) × B + J3 × C + (N2-M2) - Z. At this time, Z = 0.

[0098] In some embodiments, after the second prediction formula is obtained by fitting according to Table 3, a regression model variance analysis may be performed on the second prediction formula to derive a modified formula, as shown in Table 4:

[0099] Table 4 - Variance analysis of the corrected simulated and experimental pull-out forces

[0100]

[0101] In Table 4, P D3 If the value is greater than the third set threshold, the corresponding data variable can be removed from the second prediction formula to obtain a corrected formula, thereby further simplifying the calculation, reducing the amount of calculation, and improving efficiency without affecting the accuracy of the predicted pull-out force data.

[0102] In this embodiment, step S50 includes:

[0103] Step S54, based on the second prediction formula, sample model, P D3 The value is less than or equal to the third set threshold, and the correction formula is obtained. The correction formula is: Y3=Y 1，REVISE+(J2-K2)×B+J3×C+(N2-M2)-Z. Z=K4×D.

[0104] The correction formula derived through the above steps retains the consideration of the width data D, and can improve the accuracy of the predicted pull-out force data calculated by the correction formula.

[0105] In this embodiment, step S20 includes:

[0106] Step S21, based on the completion of the sample model establishment, the simulation component is run. The simulation component can use simulation software such as ABAQUS, ANSYS, etc. to perform simulation breakout force calculation to obtain simulation breakout force data Y1.

[0107] Step S22, based on the completion of the simulation component operation, obtain the simulated pull-out force data Y1, so as to facilitate the derivation of the first prediction formula.

[0108] Step S23: Based on the completion of the sample model establishment, a disengagement test is performed on the plunger pump assembly 01, so that the predicted disengagement force data obtained later can be compared with the data to ensure data reliability.

[0109] Step S24, performing a disengagement test based on the plunger pump assembly 01 to obtain the test disengagement force data Y2. Through the above steps, data support is provided for the subsequent derivation of formulas.

[0110] In this embodiment, step S24 includes:

[0111] Step S241, based on the disengagement test of the plunger pump assembly 01, the plunger pump assembly 01 is positioned and fixed on the test bench 21 and the pressurizing unit 22 is controlled to abut against the bushing unit 12 of the plunger pump assembly 01 to prevent the plunger pump assembly 01 from loosening during the disengagement test.

[0112] In step S242 , based on the contact between the pressurizing unit 22 and the bushing unit 12 , the pressurizing unit 22 is controlled to continue to move toward the bushing unit 12 by a set distance at a set speed, so that a force can be applied to the bushing unit 12 .

[0113] Step S243 , based on the pressurizing unit 22 moving a set distance toward the bushing unit 12 and maintaining the position for a set time, the maximum force borne by the bushing unit 12 is obtained as the test disengagement force data Y2 .

[0114] Through the above steps, the force curve borne by the bushing unit 12 can be obtained, thereby obtaining the test breakout force data Y2, which is convenient for subsequent verification of whether the predicted breakout force data is accurate.

[0115] In this embodiment, the set speed in step S242 is 2 mm / min; the set distance is 20 mm; and the set time in step S243 is 10 min. Figure 2 As shown, when the plunger pump assembly 01 is subjected to the disengagement test, the pressurizing unit 22 uses a downward pressing speed of 2 mm / min, presses down 20 mm, and the application time is 10 minutes, so that the force variation law of the plunger pump assembly 01 is obtained as follows Figure 5 As shown, it can be taken Figure 5 The maximum force in the test is taken as the test release force data Y2.

[0116] In this embodiment, a test system is disclosed, and the test system is applied to a cylinder liner pull-out force correction method in any one of the above embodiments. Figure 2 , Figure 3 , Figure 4 As shown, the test system includes: a plunger pump component 01, a test component 02, and a simulation component.

[0117] The plunger pump assembly 01 includes a cylinder unit 11 and a bushing unit 12. The cylinder unit 11 includes a cylinder body 111 and a boss groove 112. A cavity with an open end is formed in the cylinder body 111. A boss groove 112 is provided on the inner side wall of the cylinder body 111. The bushing unit 12 includes a bushing ring 121 and a boss ring 122. The two bushing rings 121 are fixedly connected to the two ends of the boss ring 122 respectively. The outer peripheral side of the bushing ring 121 is interference fit with the inner peripheral wall of the cylinder body 111.

[0118] The boss ring 122 includes a first ring portion 1221, a second ring portion 1222, and a third ring portion 1223. The first ring portion 1221, the second ring portion 1222, and the third ring portion 1223 are fixedly connected in sequence. One end of the first ring portion 1221 away from the second ring portion 1222 is fixedly connected to the bushing ring 121. One end of the third ring portion 1223 away from the second ring portion 1222 is fixedly connected to the bushing ring 121. The cross-sectional area of ​​the first ring portion 1221 gradually decreases from one end close to the second ring portion 1222 to the other end. The cross-sectional area of ​​the third ring portion 1223 gradually decreases from one end close to the second ring portion 1222 to the other end.

[0119] The plunger pump assembly 01 also includes a first state and a second state. Figure 3 As shown, in the first state, the inner diameter of the second ring portion 1222 is smaller than the inner diameter of the bushing ring 121, the outer diameter of the second ring portion 1222 is the same as the outer diameter of the bushing ring 121, and the outer peripheral wall of the second ring portion 1222 is spaced from the bottom of the boss groove 112. Figure 4As shown, in the second state, the inner diameter of the second ring portion 1222 is the same as the inner diameter of the bushing ring 121, the outer diameter of the second ring portion 1222 is larger than the outer diameter of the bushing ring 121, the outer peripheral wall of the second ring portion 1222 abuts against the bottom of the boss groove 112, and the outer peripheral walls of the first ring portion 1221 and the third ring portion 1223 abut against the peripheral side walls of the boss groove 112 respectively.

[0120] The test assembly 02 includes a test bench 21 and a pressurizing unit 22. One end of the pressurizing unit 22 is detachably connected to the test bench 21.

[0121] The simulation component is used to perform simulation calculations on the plunger pump component 01 and obtain simulated ejection force data.

[0122] The test system also includes a disengagement test state. The disengagement test state includes the test bench 21 positioning and fixing the cylinder body 111, and the pressurizing unit 22 moving in the direction close to the bushing ring 121. Through the above settings, the plunger pump assembly 01 can be subjected to a disengagement test and simulation operation, so that the simulated disengagement force data Y1 and the test disengagement force data Y2 can be obtained, and then the first prediction formula and the second prediction formula are fitted in turn, and finally the corrected fitting is obtained to obtain the corrected formula, and the predicted disengagement force data can be calculated, thereby reducing the test process and calculation amount, and improving the test efficiency.

[0123] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A cylinder liner pull-out force correction method, characterized in that: The cylinder liner pull-out force correction method comprises: Step S10, establishing a sample model based on the sample size parameters of the plunger pump assembly; wherein the sample model includes thickness data A, height data B, interference data C, and width data D; data of A, B, C, and D are all obtained within a set range; Step S20, based on the completion of the sample model establishment, obtaining the simulated pull-out force data Y1 and the experimental pull-out force data Y2; Step S30, based on the simulated escape force data Y1 and the experimental escape force data Y2, obtain a first prediction formula; wherein, the first prediction formula is: Y1=M1+K1×A+K2×B+K3×C+K4×D, Y2=N1+J1×A+J2×B+J3×C+J4×D; M1 and N1 are constants, K1, K2, K3, and K4 are respectively the first simulation coefficient, the second simulation coefficient, the third simulation coefficient, and the fourth simulation coefficient, and J1, J2, J3, and J4 are respectively the first test coefficient, the second test coefficient, the third test coefficient, and the fourth test coefficient; Step S40, based on the first prediction formula and the sample model, obtain a second prediction formula; wherein the second prediction formula is: Y 1，REVISE =M2+K2×B+K4×D,Y 2，REVISE =N2+J2×B+J3×C; M2 and N2 are both constants; Step S50, based on the second prediction formula and the sample model, obtain a correction formula; wherein the correction formula is: Y3=Y 1，REVISE + (J2-K2) × B + J3 × C + (N2-M2) - Z; Z is the compensation parameter; Step S60, based on the correction formula, the actual dimensional parameters of the plunger pump assembly, and the simulated ejection force data, the predicted ejection force data is obtained; wherein the actual dimensional parameters include height data B and interference data C; B and C are obtained within a set range.

2. A cylinder liner pull-out force correction method according to claim 1, characterized in that: The step S10 comprises: Step S11, obtaining a solid model based on the sample size parameters of the plunger pump assembly; Step S12, based on the completion of the acquisition of the solid model, respectively acquire thickness data A, height data B, interference data C, and width data D; wherein the thickness data A takes a value within the thickness range, the height data B takes a value within the height range, the interference data C takes a value within the interference range, and the width data D takes a value within the width range; Step S13, establishing a simulation model based on the thickness data A, the height data B, the interference data C, and the width data D; wherein the sample model includes the simulation model and the physical model.

3. A cylinder liner pull-out force correction method according to claim 2, characterized in that: The thickness range in step S12 is 1 mm to 1.3 mm; the height range is 0.3 mm to 0.45 mm; the interference range is 0.005 mm to 0.02 mm; and the width range is 5 mm to 5.6 mm.

4. A cylinder liner pull-out force correction method according to claim 1, characterized in that: The step S40 comprises: Step S41, based on the first prediction formula and the sample model, obtain the P1 value corresponding to the simulated pull-out force data Y1 and the P2 value corresponding to the test pull-out force data Y2; wherein the P1 value includes the P2 value corresponding to the thickness data A. A1 value, the height data B corresponding to P B1 value, the P corresponding to the interference data C1 value, the width data D corresponding to P D1 The P2 value includes the P corresponding to the thickness data A. A2 value, the height data B corresponding to P B2 value, the P corresponding to the interference data C2 value, the width data D corresponding to P D2 value; Step S42, based on the P A1 value, the P C1 The values ​​are all greater than the first set threshold, the P A2 value, the P D2 The values ​​are all greater than the second set threshold, and the second prediction formula is obtained; wherein the second prediction formula is: 1，REVISE =M2+K2×B+K4×D,Y 2，REVISE =N2+J2×B+J3×C; M2 and N2 are both constants.

5. A cylinder liner pull-out force correction method according to claim 4, characterized in that: The step S50 comprises: Step S51, based on the second prediction formula and the sample model, obtain the P3 value corresponding to the simulated escape force data Y1 and the P4 value corresponding to the experimental escape force data Y2; wherein the P3 value includes the P4 value corresponding to the height data B. B3 value, the width data corresponding to P D3 The P4 value includes the P corresponding to the height data B B4 value, the interference data C corresponding to P C4 value; Step S52, based on the P D3 The value is greater than the third set threshold, and a correction formula is obtained; wherein the correction formula is: Y3=Y 1，REVISE +(J2-K2)×B+J3×C+(N2-M2)-Z; Z=0.

6. A cylinder liner pull-out force correction method according to claim 4, characterized in that: The step S50 comprises: Step S54: based on the second prediction formula, the sample model, and the P D3 The value is less than or equal to the third set threshold, and a correction formula is obtained; wherein the correction formula is: Y3=Y 1，REVISE +(J2-K2)×B+J3×C+(N2-M2)-Z; Z=K4×D.

7. A cylinder liner pull-out force correction method according to claim 1, characterized in that: The step S20 comprises: Step S21, running the simulation component based on the sample model being established; Step S22, based on the completion of the operation of the simulation component, obtaining the simulated pull-out force data Y1; Step S23, based on the completion of the establishment of the sample model, performing a disengagement test on the plunger pump assembly; Step S24, performing a disengagement test based on the plunger pump assembly to obtain test disengagement force data Y2.

8. A cylinder liner pull-out force correction method according to claim 7, characterized in that: The step S24 comprises: Step S241, performing a disengagement test on the plunger pump assembly, positioning and fixing the plunger pump assembly on a test bench and controlling a pressurizing unit to abut against a bushing unit of the plunger pump assembly; Step S242, based on the contact between the pressurizing unit and the bushing unit, controlling the pressurizing unit to continue to move toward the bushing unit at a set speed and a set distance; Step S243, based on the pressurizing unit moving a set distance toward the bushing unit and maintaining the movement for a set time, the maximum force borne by the bushing unit is obtained as the test disengagement force data Y2.

9. A cylinder liner pull-out force correction method according to claim 8, characterized in that: The set speed in step S242 is 2 mm / min; the set distance is 20 mm; and the set time in step S243 is 10 min.

10. A test system, the test system being applied to a cylinder liner pull-out force correction method according to any one of claims 1 to 8, characterized in that: The test system comprises: A plunger pump assembly, the plunger pump assembly comprises a cylinder unit and a bushing unit; the cylinder unit comprises a cylinder body and a boss groove; a cavity with an opening at one end is formed in the cylinder body; a boss groove is provided on the inner side wall of the cylinder body; the bushing unit comprises a bushing ring and a boss ring; two bushing rings are fixedly connected to the two ends of the boss ring respectively; the outer circumference of the bushing ring is interference fit with the inner circumference of the cylinder body; The boss ring comprises a first ring portion, a second ring portion and a third ring portion; the first ring portion, the second ring portion and the third ring portion are fixedly connected in sequence; one end of the first ring portion away from the second ring portion is fixedly connected to the bushing ring; one end of the third ring portion away from the second ring portion is fixedly connected to the bushing ring; the cross-sectional area of ​​the first ring portion gradually decreases from one end close to the second ring portion to the other end; the cross-sectional area of ​​the third ring portion gradually decreases from one end close to the second ring portion to the other end; The plunger pump assembly also includes a first state and a second state; in the first state, the inner diameter of the second ring portion is smaller than the inner diameter of the bushing ring, the outer diameter of the second ring portion is the same as the outer diameter of the bushing ring, and the outer peripheral wall of the second ring portion is spaced apart from the groove bottom of the boss groove; in the second state, the inner diameter of the second ring portion is the same as the inner diameter of the bushing ring, the outer diameter of the second ring portion is larger than the outer diameter of the bushing ring, the outer peripheral wall of the second ring portion abuts against the groove bottom of the boss groove, and the outer peripheral walls of the first ring portion and the third ring portion abut against the peripheral side walls of the boss groove respectively; A test assembly, the test assembly comprising a test bench and a pressurizing unit; one end of the pressurizing unit is detachably connected to the test bench; A simulation component, the simulation component is used to perform simulation calculations on the plunger pump component and obtain simulated ejection force data; The test system also includes a disengagement test state; the disengagement test state includes the test bench positioning and fixing the cylinder body, and the pressurizing unit moving toward the direction approaching the bushing ring.

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